Ink for ink-jet printer and ink-jet printing method

FIELD: chemistry.

SUBSTANCE: invention pertains to ink for an ink-jet printer. Description is given of the ink for an ink-jet printer, containing 62-77 mass % water, 10-18 mass % dye, X (%), water soluble organic substance 1 and 2.0-15 mass %, Y (%), water soluble organic substance 2. Viscosity of the ink ranges from 1 to 5 cP at 25°C, content X (%) of substance 1 and content Y (%) of substance 2 satisfies the relationship in formula (I) and formula (II): (I) 0.15 ≤ Y/X ≤ 0.9; (II) 15 mass % ≤ X+ Y ≤ 32 mass %. Compound 1 is a water-retaining water soluble organic compound, with difference between the water-retention capacity in a surrounding medium at 23°C and humidity of 45% and water-retention capacity in a surrounding medium at 30°C and 80% humidity at 36% or less. Compound 2 is a water soluble organic compound, different from the dye and from the water soluble organic compound 1.

EFFECT: proposed ink sufficiently suppresses the effect of twisting printing material and provides for stable injection.

26 cl, 6 dwg, 6 tbl, 21 ex

 

The technical FIELD

The present invention relates to ink for inkjet printer, method of inkjet printing and apparatus for inkjet printing.

BACKGROUND of INVENTION

Method of inkjet printing relates to a method which performs recording of images and texts, allowing small ink droplets to fly in accordance with a variety of rules to apply them on the recording media (such as paper). Technology has characteristic features such as high speed, low noise, easy multi-color printing, high flexibility schemes print and no need for the developing and fixing, and so it spreads to a wide variety of applications. In addition, recently developed full-color inkjet printing system, and it is capable of forming multicolor images, comparable with images of polychrome printing print method or printed images from a color photo. To print a small number of instances, this technology can produce printed materials at a lower cost than conventional polychromatic or photographic print.

Under such circumstances, in response to demands improved printing properties, including high speed, high resolution and polnocvetnoi print, were pre is taken efforts to improve the apparatus for ink jet printing and method of inkjet printing. Since the apparatus for forming images, such as printers, which use a system of inkjet printing, use in different situations, printing stability is also important and, in addition, an increased durability of the image is the property required of ink.

As the media used in the method of ink jet printing, on the market there are various products, such as ordinary paper, coated paper, glossy paper, paper for kodascope (NRO projector) and print from the reverse side, while for General use in offices is mainly used cheap simple paper. However, when the media use plain paper, it becomes necessary to reduce or prevent the occurrence of Curling (warping or twisting of the paper), which occurs when a large amount of ink applied to the print media, satisfying at the same time, the above-mentioned requirements. This phenomenon twisting attributed mainly to the application of moisture. It is known that a significant phenomenon twisting occurs when moisture is applied on a large area or in large quantities. In the case of ink jet printing is conducted on plain paper, it becomes important to decrease or suppression not only of the phenomenon of Curling during printing, but also phenomena of skru the air traffic management after printing, caused by drying and evaporation (the phenomenon of Curling after printing).

Printed material (print), obtained according to the inkjet printing system, used for various purposes, but curled paper cannot be saved flat, which causes a lot of difficulties from the phenomenon of twisting when the paper is folded in a pack or put in the files. In addition, trial printing presentation materials such as slides and leaves NRO projector, often printed on inexpensive plain paper, and when drawings, pictures or justification print additional color (blue and so on), paper becomes curtailed, which in many cases makes it difficult handling.

To the present time have been proposed some approaches to decrease or prevent the phenomenon of twisting. For example, the proposed ink for inkjet printer containing a solid substance, which is soluble in water or water-organic solvent and has four or more hydroxyl groups in the molecular structure (see, for example, is available for public review Japanese patent application No. N-332775). In addition, the proposed ink containing as antibrucella agents, sugars, sugar alcohol and specific amide compound (see, for example, laid open OSN is Comline Japanese patent application No. N-157955, posted for public review Japanese patent application No. N-240189 posted for public review Japanese patent application No. N-165539 and posted for public review Japanese patent application No. N-176538). Further, the proposed ink containing in combination a specific polyhydric alcohol and glycerol (see, for example, is available for public review Japanese patent application No. N10-130550). In addition, the proposed ink containing a solvent, a polymeric binder, hardener paint, water-soluble anticrease connection, water soluble rassledovanie connection permanent connection and the non (see, for example, is available for public review Japanese patent application No. 2000-198267).

The phenomenon of twisting can be somewhat suppressed by introduction of normal compounds to prevent the phenomenon of twisting, but inkjet printing has been improved and uses an even higher speed, and the ejection stability and reliability are important in the process of high-speed printing. Accordingly, in addition to ensuring such properties as stability, penetrating power, and the viscosity of the ink themselves, it is also important to maintain a high level the basic properties of the ink for inkjet printing, in particular stabiles and ejection of the ink, which, more specifically, is a property counteract clogging of the ejection port of the ink (nozzles) of the head inkjet printing, and starting characteristics (the ability to re-ejection of ink from the nozzle after a temporary break (stop or pause) the ejection of ink), and at the same time reducing or preventing the effects of twisting.

Accordingly, the present invention is to provide ink for inkjet printer, which can reduce or prevent the occurrence of twisting while providing required for ordinary ink for inkjet printer ejection stability after leaving the cooking and ejection stability, which can prevent the instability and the blurring of the initial parts of the print at the beginning of printing (starting characteristic), method of inkjet printing, ink cartridge and apparatus for inkjet printing.

In addition, another objective of the present invention is sufficient to reduce or prevent the occurrence of twisting, thereby making easier the handling printed materials obtained with the use of simple paper.

The INVENTION

The above objectives are achieved by the present invention, is described below.

That is, ink for inkjet printer according to the present invention include at least water to acitelli, water-soluble organic substance 1 and the water-soluble organic substance 2, and the content X (%) water-soluble organic substance 1 is 10 wt.% or more of the total amount of ink for an inkjet printer, and the content X (%) water-soluble organic substance 1 and the content Y (%) water-soluble organic substance 2 from the total amount of the ink for inkjet printer satisfies the following formula (I) and formula (II):

(I) 0 < Y/X≤0,9,

(II) X+Y≥15 wt.%,

and where the water-soluble organic compound 1 is a hydrophilic water-soluble organic compound having a difference between the moisture-retention ability in an environment with a temperature of 23°C and humidity of 45% and the moisture-retention ability in an environment with a temperature of 30°C and humidity 80% of 36% or less, and a water-soluble organic compound 2 is a water-soluble organic compound that is different from the dye and water-soluble organic compounds 1.

In particular, it is preferable that the content Y (%) water-soluble organic substance 2 was Y < 15 wt.% and the difference between the ability to capture water was 40% or more.

Next, another implementation of the present invention is the ink for inkjet printer, include the ie at least water and a dye, additionally comprising a water-soluble organic compound 1-1, water-soluble organic compound 1-2 and water-soluble organic compound 2-1, where the content of X1(%) water-soluble organic substances 1-1 in the calculation of the total amount of ink for an inkjet printer, the contents of X2(%) water-soluble organic matter in 1-2 based on the total amount of ink for inkjet printer and the contents of Y1(%) water-soluble organic substances 2-1 in the calculation of the total amount of ink for an inkjet printer meets the ratios of the following formulas(1)-(3):

(1) 0,1≤(X2+Y1)/X1≤2,5,

(2) X1+X2≥10 wt.%,

(3) X2+Y1≥3 wt.%,

and where the water-soluble organic compound 1-1 is a water-soluble polyhydric alcohol or a water-soluble amide compound having the difference between water-holding capacity in the environment with temperature of 23°C and humidity of 45% and the moisture-retention ability in an environment with a temperature of 30°C and humidity 80% of 36% or less and a molecular weight of MWin the range of 100≤MW≤1000; water-soluble organic compound 1-2 is a water-soluble alkanediols with the difference between water-holding capacity in the environment with the pace which the pipes 23° C and humidity of 45% and the moisture-retention ability in an environment with a temperature of 30°C and humidity 80% of 36% or less and a molecular weight of MWin the range of 100≤MW≤150, alkanediols, optionally containing the group-HE is on both ends of the main chain, and a water-soluble organic compound 2-1 is a water-soluble organic compound other than the dye, water-soluble compounds 1-1 and water-soluble compounds 1-2.

In particular, it is preferable that the content of Y1(%) water-soluble organic substances 2-1 was Y1< 15 wt.%, and the difference between the water retention ability was 40% or more.

Method of inkjet printing according to the invention comprises applying the above-mentioned ink for inkjet printer on the recording media through the inkjet head of the printer to form the image.

Ink cartridge according to the present invention contains the above-mentioned ink for inkjet printer.

Apparatus for inkjet printing according to the present invention equipped with the above-mentioned ink for inkjet printer.

According to the present invention, the occurrence of Curling can be sufficiently prevented, and handling printed materials, especially on plain paper is, therefore, levchev method, inkjet printing, using plain paper. In addition the proposed ink and a printing method of using them, which can ensure the stability of ejection of the ink for ink jet printing.

Brief description of drawings

Figure 1 shows the results of determining the water-holding capacity water-soluble organic compounds;

figure 2 shows the difference between the water-holding ability in these two environments;

figure 3 is a perspective view showing an example of the apparatus for inkjet printing;

figure 4 is a view of an ink cartridge in vertical section;

figure 5 is a perspective view of the printing unit;

6 is a schematic perspective view showing an example of an ink cartridge having an ejection head of a liquid.

The BEST WAY of carrying out the INVENTION

Further, the present invention is described in more detail with reference to the preferred implementation.

The mechanism of the phenomenon curl

The present invention has been made to prevent the phenomenon of Curling of the recording medium after printing the ink for inkjet printer (referred to in the present description hereinafter "ink") to media printing method inkjet printing.

The mechanism of the phenomenon of Curling after printing is the Le print is the following. Cellulose fiber is formed in the paper papermaking machine so as to be elongated in the line (largely force oriented along the flow direction of the paper. Because the cellulose fiber has a very different degrees of tension, due to the moisture in the machine direction and in the transverse direction resizing that occurs when applying moisture varies in a short grain and long grain. Therefore, when the paper is applied moisture, cellulose fiber in the transverse direction of the paper swells and the length of the paper increases in the direction (mostly long grain paper)perpendicular to the direction of flow (mainly short grain paper) paper machine when the paper is formed. For this reason, when the amount of ink applied, i.e. the number of deposited moisture when printing is great, the phenomenon of twisting in the opposite direction to the plane, which caused moisture, namely the phenomenon of negative curl. However, due to the gradual evaporation of moisture that has been previously absorbed into the cellulose fiber, cellulose fiber begins to shrink, which allows you to shrink the paper. In accordance with this length of paper becomes less than the length before applying moisture.

Therefore clicks the zoom, the paper is gradually twisted in the direction of the plane on which put moisture, namely the phenomenon of positive curl. It seems, arises from the fact that the moisture caused when printing, first enters the hydrogen bond between the fibers, and as the moisture is transferred by evaporation or the like, the voltage applied at the initial stage, is removed, and the printed portion is reduced. This phenomenon of positive curl creates a problem when inkjet printing is performed on such recording media as paper.

The authors of the present invention conducted a detailed observation of the phenomenon of positive twisting that occurs when printing is carried out by a method of inkjet printing. As a result, they found that the phenomenon of positive curl is continually evolving over a long period, when the paper applied the ink jet printer, unlike the case when the paper put simply moisture.

Currently, organic compounds such as glycerol and urea, which are found in most types of ink for inkjet printers, it is highly contribute to the reliability, in particular the stability of ejection of the ink jet printer. On the contrary, it is believed that these organic compounds may be the cause of the gradual development of the phenomenon of positivenegative.

Keeping water soluble organic compound

Because the phenomenon of curl after application of a liquid medium containing water, on paper it seems to have a correlation with evaporation deposited on the paper moisture, the authors of the present invention conducted the following detailed study of the ability of the capture of water soluble organic compounds, which are usually used for ink jet printers.

First, there were prepared with 20 wt.% aqueous solutions of various water-soluble organic compounds, and 10 g of each solution was accurately weighed and placed in a glass Petri dish and left to stand in an environment with a temperature of 23°C and humidity of 45%. Standing left clean water not containing water soluble organic compound. Due to the water evaporation amount of the solution in the Petri dish was decreased, and the weight became constant. At left is also a glass Petri dish, which contained only pure water, by this time evaporated all clean water, and based on this, it was believed that what was left in a Petri dish containing water soluble organic compound is a water-soluble organic compound and the moisture retained in the substance. Based on this, the expected water retention is capable of being the feature of each water-soluble organic compounds according to the following formula:

The water holding capacity (%) =

Next above the Petri dish was placed in an ambient temperature of 30°C and humidity 80%, and after waiting until equilibrium is established, as described above, was determined by the water-holding capacity under these conditions. Next, the same Petri dishes were again placed in an ambient temperature of 23°C and humidity of 45% and measured water retention capacity. The obtained results are shown in figure 1. In addition the difference between the water retention ability in both environments is shown in figure 2.

The authors of the present invention has taken into consideration a certain correlation between the differences in water retention ability in the above mentioned environments and the emergence of the phenomenon of Curling of paper. Based on this, the emergence of the phenomenon of Curling was studied by applying on plain paper of aqueous solutions containing the subjects of water-soluble organic compounds tested above. In the result it was found that water-soluble organic compound, which is the difference between the water retention ability in an environment with a temperature of 23°C and humidity of 45% and the water retention ability in an environment with a temperature of 30°C and humidity 80% of 36% or less, can significantly prevent the phenomenon of crucian who I am. Then preparing the ink containing the dye, additives, and these water-soluble organic compounds, and perform printing on an inkjet printer in order to observe the emergence of the phenomenon of twisting.

In the result, it was confirmed that the phenomenon of twisting did not occur even after a period of time in a few days after printing.

Water-soluble organic compound in the present invention relates to water-soluble organic compound having a water retention capacity of 5% or more in the environment with temperature of 23°C and humidity of 45%.

However, when the ink is composed of a water-soluble organic compound 1 as the only water-soluble organic compounds are placed in a printhead of an inkjet printer, which ejective droplets through the nozzle, and a head attached to the apparatus for inkjet printing and leave it for a long time, there arise other problems, namely that the ejection stability deteriorates due to driving of the nozzles and the printing of the initial unstable parts at the beginning of printing at a low temperature and low humidity environment.

In such circumstances, the authors of the present invention continued for more research in order to ensure the stability of ejection, is equal to the second conventional ink for inkjet printer prevention of the phenomenon of twisting to a certain extent or more. It was finally found that the aforementioned problems can be resolved by adding to the ink for inkjet printer in addition to water-soluble organic compound 1 is a water-soluble organic compounds other than water-soluble organic compound 1, which, more specifically, is a water-soluble organic compound 2, with the difference between the water retention ability in an environment with a temperature of 23°C and humidity of 45% and the water retention ability in an environment with a temperature of 30°C and humidity 80% for more than 36%, in a proportion satisfying the following formulas (I) and formula (II):

(I) 0 < Y/X ≤ 0,9,

(II) X+Y≥15 wt.%

(X: content (%) water-soluble organic compound 1 in the calculation of the total amount of ink for inkjet printer, Y: the content (%) water-soluble organic compound 2 in the calculation of the total amount of ink for inkjet printer).

In addition, the study authors present invention have shown that, when applied to a large amount of ink, specifically, greater than 3.0 g/m2the content X (%) water-soluble organic compound 1 should be 10 wt.% or more per the total number of the quantity of ink for inkjet printer in addition to the above conditions.

Water-soluble organic compound 1 is preferably a polyhydric alcohol having an amide bond or polyhydric alcohol having sulfonyl group.

Water-soluble organic compound 2 in the present invention corresponds to the water-soluble organic compound, usually used for ink jet printers.

Water-soluble organic compound 2 has a large difference between the water retention ability, readily releases moisture during the drying process media, which caused moisture and accelerates the reduction of cellulose fibre. Most water-soluble organic compounds 2 has a small molecular weight, about 100 or less, and easily migrate within the media, as it makes the moisture, and it is hard fixed on the cellulosic fiber. Accordingly, water-soluble organic compound 2 is gradually migrates inside the media, accelerating the phenomenon of twisting. Therefore, the phenomenon of Curling is quite strong, when plain paper put a lot of ink containing a water-soluble organic compound 2, which is usually used for ink for inkjet printers.

The study authors present invention showed that even if the ink is La ink-jet printer containing a water-soluble organic compound 2, which tends to accelerate the phenomenon of twisting, the occurrence of Curling can be effectively prevented and the ejection stability is improved when contains the above-mentioned water-soluble organic compound 1, and the content of Y/X is a water-soluble organic compound 1 and a water-soluble organic compound 2 is adjusted to 0 < Y/X ≤ 0.9, as shown in the formula (1).

In addition, the authors of the present invention have also found that the total content of X+Y (%) water-soluble organic compound 1 and a water-soluble organic compound 2 should be X+Y ≥ 15 wt.%. This is because, when the ink is applied to paper, it can reduce the moisture content by increasing the total content of water-soluble organic compounds in the ink for inkjet printer in order to prevent the evaporation of water for a short time and cuts paper, due in particular migration. In addition, it was assumed that in order to prevent the evaporation of ink printed on paper, the total content of water-retaining water-soluble organic compounds, i.e. water-soluble organic compound 1 and a water-soluble organic compounds 2, should be 15 wt.% or more.

The above X+Y is more preferably udovletworyaet value X+Y ≥ 20 wt.%, even more preferably X+Y ≥ 25 wt.%. The authors of the present invention was prepared ink having a higher total content of X+Y (%) water-soluble organic compound 1 and a water-soluble organic compounds 2 and observed the phenomenon of Curling. As a result, when the above X+Y is large, the phenomenon of twisting that occurs in a short interval of time after printing, can be effectively prevented. In particular, when X+Y ≥ 25 wt.%, the phenomenon of twisting that occurs in a short interval of time after printing, can be effectively improved.

In addition, the water content is preferably 77 wt.% or less, more preferably, 71 wt.% or less, based on the total amount of ink for an inkjet printer.

In addition, the content Y (%) water-soluble organic compound 2 is preferably Y < 15 wt.% in the calculation of the total amount of ink for an inkjet printer. The reason for this is presumably as follows. As described above, since the water-soluble organic compound 2 has the ability to accelerate the phenomenon of twisting, the higher its content in the ink, the higher the probability of the occurrence of the phenomenon of twisting. For this reason, even if the ink for inkjet printer contain a large number of vodorastvorimogo organic compounds 1, water-soluble compound 2 causes the migration of water-soluble organic compound 1, weakening the prevention of the phenomenon of twisting water-soluble organic compound 1. The difference between the water retention ability of water-soluble organic compound 2 is preferably 40% or more.

Another implementation of the present invention, described below, also can effectively prevent the phenomenon of Curling after printing on the print media, in particular, on plain paper, and can provide excellent ejection stability.

The authors present invention further research, using a water-soluble organic compound 1 and a water-soluble organic compound 2. In the result, it was found that the above problems can be effectively solved by the introduction of ink for inkjet printer, one or more of each of the water-soluble organic compounds 1-1 and water-soluble organic compounds 1-2, except water-soluble organic compound 1. In other words, it was found that the aforementioned problems can be resolved by introducing a water-soluble organic compound 1-1, water-soluble organic compound 1-2 and water-soluble organic compound 2-1 in proportion with what is X 1(%), X2(%) and Y1(%) the above water-soluble organic compounds in the calculation of the total amount of ink for inkjet printer, satisfying the following conditions:

(1) 0,1 ≤ (X2+Y1)/X1≤ 2,5,

(2) 10 wt.% ≤ X1+X2,

(3) 3 wt.% ≤ X2+Y1

(X1: content (%) water-soluble organic compound 1-1 in the calculation of the total amount of ink for inkjet printer, X2: content (%) water-soluble organic compound 1-2 in the calculation of the total amount of ink for inkjet printer, Y1: content (%) water-soluble organic compound 2-1 in the calculation of the total amount of ink for inkjet printer).

Effect of water-soluble organic compound 1-1 and water-soluble organic compound 1-2 in this implementation are described below.

Water-soluble organic compound 1-1 is a water-soluble polyhydric alcohol or a water-soluble amide compound with the difference between the moisture-retention ability in an environment with a temperature of 23°C and humidity of 45% and the moisture-retention ability in an environment with a temperature of 30°C and humidity 80% of 36% or less, and a molecular weight of MWin the range of 100 ≤ MW≤ 1000.

As in rastvorimae organic compound 1-1 has a large molecule, it hardly penetrates into the cellulose fiber and, thus, has little effect on the occurrence of the phenomenon of twisting in a relatively short period of time after printing. However, once the connection was included in the cellulose fiber, it almost does not cause migration. This seems to be happening because the connection has a moderate water-holding capacity and is less suitable in order to accumulate more water than necessary, and has a high affinity for cellulose fiber, because it has in the molecule a lot, specifically, at least three parts, which can easily form a hydrogen bond.

For example, trioli have 3 or more-Oh groups, sugars have 2 or more-Oh groups and a carbonyl group, N,N'-bis-(2-hydroxyethyl)urea is 2 or more-Oh groups and amide bond, bis-hydroxyethylation has 2 or more-Oh groups and sulfonyl group, and tetraethylene glycol has 2 or more-Oh groups and 3 or more ether bonds. It was also suggested that many factors, such as the large size of the molecules and the low possibility of migration of water, effectively play a role.

On the other hand, although diethylene glycol, for example, has a molecular weight of 100 or more and 2 groups of IT on both ends of the molecule, and the ester linkage in the molecule, the effect of preventing the phenomenon of twisting small. Find it is camping, that is so because the hydrophilic property to join the hydrogen) is less than when only one essential way than one group-IT, and in aqueous solution, containing, molecules are curved due to the interaction between the ether bond and the water molecules, and the size of the molecules becomes smaller. Thus, it is assumed that diols having the ester linkage in the molecule must have at least three essential communication in order to show the effect of preventing the phenomenon of twisting.

Water-soluble organic compound 1-2 is a water-soluble alcander with the difference between the moisture-retention ability in an environment with a temperature of 23°C and humidity of 45% and the moisture-retention ability in an environment with a temperature of 30°C and humidity 80% of 36% or less, and a molecular weight of MWin the range of 100 ≤ MW≤ 150 and groups-IT on both ends of the main chain.

Effect of water-soluble organic compound 1-2 is the prevention of the phenomenon of twisting that occurs in a relatively short period of time after printing (several hours after printing). Although water-soluble organic compound 1-2 effectively prevent the phenomenon of twisting that occurs in a relatively short period of time p the following printing, it has less of an impact on the phenomenon of twisting that occurs in the time interval, longer than the one (from 5-6 hours to several weeks). This seems to be happening because the water-soluble organic compound 1-2 is alkanediols, which has a molecular weight of from 100 to 150 or below and contains the group-HE is on both ends of the main chain, and because it does not contain in the molecule hydrophilic relationship, such as the ester linkage, the molecules are not curved, which makes the size of the molecule is relatively large. In addition, it was assumed that due to its lipophilic structure and hydrophilic molecular ends of the connection has a characteristic that is similar to surfactants and, thus, tends to quickly moisten the cellulose fiber. Further, the average molecular size can make it easier primikayushim in the pulp and fiber, making it possible to prevent the phenomenon of twisting that occurs within a short period of time. However, it was believed that as the number of groups HE that have an affinity for cellulose fiber, a little, for a long time may experience migration.

The authors of the present invention have found that the combined use of water-soluble organic compound 1-1 and water-soluble organic compound 1-2 possess the AET effect of preventing the phenomenon of Curling for a short time until a long time after printing, as compared with the case which contains only one kind of water-soluble organic compounds. This seems to be happening because the water-soluble organic compound 1-1 and water-soluble organic compound 1-2 have similar structure and therefore have a high compatibility and, thus, water-soluble organic compound 1-1 can be effectively introduced into the cellulose fibers together with water-soluble organic compound 1-2, resulting in prevention of the phenomenon of Curling for a short time until a long time after printing.

The authors of the present invention have found that the prevention of the phenomenon of short-term curl can be effectively improved in a high degree, when the total content of water-soluble organic compound 1-1 and water-soluble organic compound 1-2 in the case of the combined use less than 25 wt.% in the calculation of the total amount of ink for inkjet printer, or when the water content is more than 71 wt.% in the calculation of the total amount of ink for an inkjet printer. In particular, in the above-mentioned conditions, the ink containing a water-soluble organic compound 1-2, and inks that do not contain it, present a striking contrast with the phenomenon of twisting that occurs over against the sustained fashion short time after printing.

As described above, the ink for ink jet printing containing the water-soluble organic compound 1-1 and water-soluble organic compound 1-2, can effectively prevent the phenomenon of twisting. However, in order to ensure the stability of ejection of the ink for inkjet printer, it is necessary to use a combination of water-soluble organic compound 2-1.

In the present invention water-soluble organic compound 2-1 is different from the dye, water-soluble organic solvent 1-1 and water-soluble organic solvent 1-2. More specifically, it is a water-soluble organic compound having a difference between the moisture-retention ability in an environment with a temperature of 23°C and humidity of 45% and the moisture-retention ability in an environment with a temperature of 30°C and humidity 80% for more than 36%.

The reason for this may be the following. As described above, water-soluble organic compound 1-2 has characteristics similar to a surfactant, and has a low compatibility with the dye. Therefore, water-soluble organic compound 1-2 is present near the nozzle inkjet printer at concentrations higher than the concentration of other components and, thus, prevents the evaporation of moisture in the wrong nozzle. Using a water-soluble organic compound 2-1, which has high compatibility with dye and high water retention capacity, it is possible to prevent increase in the viscosity inside the nozzle and to improve the ejection stability.

The study authors present invention have shown that, even if the ink for inkjet printer contain water-soluble organic compound 2-1, which tends to accelerate the phenomenon of twisting, the occurrence of Curling can be always prevented for the period from short to long time after printing, and the ejection stability can be improved even further contains the above-mentioned water-soluble organic compound 1-1 and water-soluble organic compound 1-2, and the ratio (X2+Y1)/X1water-soluble organic compound 1-1, water-soluble organic compound 1-2 and water-soluble organic compound 2-1 is set as 0.1 ≤ (X2+Y1)/X1≤ 2,5, as shown in the formula (1).

The study authors present invention also found that, in order to prevent the phenomenon of Curling, when put a large amount, specifically, greater than 3.0 g/m2ink, the amount of X1+X2(%) content of water-soluble organic compound 1-1 and water-soluble organic soy is inane 1-2 should be X 1+X2≥ 10 wt.%.

The study authors present invention has also shown that in order to improve the ejection stability, the sum of X2+Y1water-soluble organic compound 1-2 and water-soluble organic compound 2-1 should be X2+Y1≥ 3 wt.%, in addition to the above conditions.

In addition, the water content is preferably 77 wt.% or less, more preferably 71 wt.% or less based on the total amount of ink for an inkjet printer.

Further, the content of Y1(%) water-soluble organic compound 2-1 is preferably Y1< 15 wt.% in the calculation of the total amount of ink for an inkjet printer. The reason for this can be assumed as follows. As described above, water-soluble organic compound 2-1 tends to accelerate the phenomenon of twisting, and the higher its content in the ink, the higher the probability of the phenomenon of twisting. For this reason, even if the ink contains a large amount of water-soluble organic compound 1-1 and water-soluble organic compound 1-2, a water-soluble organic compound 2-1 is causing the migration of water-soluble organic compound 1-1 and water-soluble organic compound 1-2 and reduces the effect of preventing the phenomenon of the TFR is zivania water-soluble organic compound 1-1 and water-soluble organic compound 1-2. Next, the difference between woodenjewelry abilities of the water-soluble organic compound 2-1 is preferably 40% or more.

In addition to the formulas (1)to(3) preferably satisfies at least one condition selected from the following conditions (A)-(F):

(A) X1X2and Y1additionally satisfy the following formulas:

0,2 ≤ (X2+Y1)/X1≤ 2,0, X1+X2≥ 13 wt.% and X1+X2+Y1≥ 15.%;

(B) X1X2and Y1additionally satisfy the following formula:

0,2 ≤ (X2+Y1)/X1≤ 1,5;

(C) X1X2and Y1additionally satisfy the following formulas:

0,2 ≤ (X2+Y1)/X1≤ 1,5, 0 wt.% < Y1≤ 11 wt.% and X1+X2+Y1≥20 wt.%;

(D) X1X2and Y1additionally satisfy the following formulas:

0,2 ≤ (X2+Y1)/X1≤, 1.5, and X1+X2+Y1≥ 25 wt.%;

(E) X1X2and Y1additionally satisfy the following formulas:

0,2 ≤ (X2+Y1)/X1≤ 1,0, X1+X2≥ 13 wt.% and X1+X2+Y1≥ 20 wt.%;

(F) X1X2and Y1additionally satisfy the following formula:

0 < Y1/(X1+X2) ≤ 0,9.

Ink for inkjet printer

The components that make up the ink for inkjet printer according to the present invention, are described in detail.

Water retention water-soluble compound

The following shows specific examples of water-soluble organic compound 1, or a water-soluble organic compound 1-1, or water-soluble organic compound 1-2 and water-soluble organic compound 2, or a water-soluble organic compound 2-1.

-Specific examples of water-soluble organic compounds 1

Water-soluble organic compounds having a polyethylene structure and containing a hydrophilic binder group other than the group-HE, such as ethylene oxide-modified triacrylate glycerin (the number of connected units of ethylene oxide from 6 to 30), dipentaerythritol and ethylene oxide modified acrylate complex ether (the number of connected units of ethylene oxide from 8 to 40).

-Specific examples of water-soluble organic compound 1, or a water-soluble organic compound 1-1

The glycols having an average molecular weight of 200 (the main component of tetraethylene glycol), 300 (the main component of hexamethylenimine), 400 (the main component of monoethyleneglycol), 600 (the main component of tredecillion and 1000 (the main component of cocotaltropical), three - or higher atomic alcohol, such compounds as 1,2,6-hexanetriol, trimethylolpropane, trimethylacetyl, pentaerythritol and diglycerin, the compounds of polyhydric alcohol containing a group having a property to contact with hydrogen, such as a carbonyl group, sulfona group and amide group, such as glucose, sorbitol, bis-hydroxyanisole, N,N'-bis-(2-hydroxyethyl)urea and Tetra-(2-hydroxyethyl)phenyldiamine. Of these compounds, particularly preferred are polyethylene glycol having an average molecular weight of 200, 1,2,6-hexanetriol, trimethylolpropane, bis-hydroxyethylation and N,N'-bis-(2-hydroxyethyl)urea.

-Specific examples of water-soluble organic compound 1, or a water-soluble organic compound 1-2

Arcangioli with the group-HE is on both ends of the main carbon chain which may have a Deputy, such as 1,5-pentanediol, 1,6-hexanediol, 1,7-heptanediol, 3-methyl-1,5-pentanediol, 2-amino-2-methyl-1,3-propandiol and 2-amino-2-ethyl-1,3-propandiol. Of them, particularly preferred is 1,6-hexanediol.

-Specific examples of water-soluble organic compound 2, or a water-soluble organic compound 2-1

Water-soluble organic compounds, which contain a hydrophilic group and have a small number of carbon atoms, such as urea, ethyl shall glycol, 2-pyrrolidone, etilenmocevina, glycerol and diethylene glycol. Of them, particularly preferred are urea, 2-pyrrolidone, etilenmocevina and glycerin.

In the present invention, at least one of the above-mentioned water-soluble organic compounds 1 or a water-soluble organic compounds 1-1 preferably has an amide bond in the molecule. In particular, preferred is N,N'-bis-(2-hydroxyethyl)urea. The reason for this is that N,N'-bis-(2-hydroxyethyl)urea has the ability to prevent the Association of the molecules, and in the present invention where it is necessary to share different water-soluble organic compounds, it shall prevent the Association of water-soluble organic compounds. In particular, for a method of inkjet printing such abilities as preventing the ground and the solubility of the dye, can be more easily, in accordance with what can be effectively prevented the occurrence of Curling, and the ejection stability and reliability can be greatly improved. In particular, when a water-soluble organic compound 1, or a water-soluble organic compound 1-1 using N,N'-bis-(2-hydroxyethyl)urea or bis-hydroxyethylation, in combination, it is preferable to use a diol or triol having 5 or more carbon atoms Of the diols or triolo, having 5 or more carbon atoms, are preferred, in particular, 1,6-hexanediol and 1,2,6-hexanetriol. When used in combination, the aforementioned ability to prevent the Association of molecules can be more effectively brought to action, and can be achieved particularly good effect of preventing the phenomenon of twisting and ejection stability.

Usually the connection is classified as a water-soluble organic compound 1, often increases the viscosity when it is added to the ink, and the effect of twisting can be improved when the added amount of increase, but in some cases there is a problem, in particular, the starting characteristics of ejection stability. To solve this problem, at least one of the above-mentioned water-soluble organic compounds 1 or a water-soluble organic compounds 1-1 is preferably a water-soluble organic compound containing sulfonyl group. Of these compounds the most preferred is bis-hydroxyethylation. This is because, when used in combination with other components, bis-hydroxyethylation makes it difficult solvation between other components and water and lowers the viscosity. So, in the case of ink method for inkjet printing, in particular bis-hydroxic sulfon is effective for improving the starting characteristics of stabilnosti ejection.

In addition, water-soluble organic compounds such as urea and etilenmocevina are preferred because they have a small molecular weight and is not easily increase the viscosity, even when they are added in larger quantities. Water-soluble organic compounds such as urea and etilenmocevina, can be used as water-retaining water-soluble organic compounds in the present invention by combining them with water-soluble organic solvent or a water-soluble compound such as a dye. The results of measuring the moisture retaining capacity of ethylenoxide (with the difference in the power of the environment, shown in figure 1, shows the data obtained when measuring with the dye.

With regard to molecular weight water-soluble organic compounds, which have a distribution of molecular weight, such as the above-mentioned polyhydric alcohol having an amide bond, and the polyethylene glycol, average molecular weight was determined by one of the following methods:

(1) In accordance with JIS Handbook, Chemical Analyses, K0118 and K0123, for the measurement of molecular weights was used for mass spectrometric measurement, gas chromatography-mass spectrometry (GC-MS) and liquid chromatography-mass spectrometry (LC-MS).

(2) polyethylene glycol having a distribution of the bookmark molecular weight, its average molecular weight was determined by exclusion chromatography size (GPC) in accordance with JIS Handbook, Chemical Analyses, K0124, and measured were taken for molecular weight. Further, water-soluble organic compounds having a distribution of molecular weight, other than polyethylene glycol, expected mass average molecular weight converted to polyethylene glycol, and some were taken for molecular weight.

(3) In accordance with NMR, infrared spectroscopy or elemental analysis identified patterns of water-soluble organic compounds for the determination of molecular weight.

The dye

Examples of coloring substances used for ink for inkjet according to the present invention include water-soluble dyes and pigments. The dye can be used alone or in combination of two or more.

-Dye

Examples of dyes for use in the present invention include anionic water-soluble dye having a hue of a color, black, cyan, Magenta and yellow. Anionic water-soluble dye is not particularly limited as long as he is acidic dye, a direct dye or an active dyes listed in the colour index. In addition, even if the dye is not included in the color index, the dye is not particularly limited to as long as it contains anionic group, such as sulfona group. These dyes are used in the range from 1 to 10 wt.%, preferably from 1 to 5 wt.% in the calculation of the total amount of ink for an inkjet printer. Can be used as a dye other than the above-mentioned dyes. A concrete example is the dye containing a carboxyl group as solubilizers group. Of these dyes, preferred is a dye having pH-dependent solubility. These dyes can be used in the range from 1 to 10 wt.%, preferably, from 1 to 7 wt.% in the ink.

In units of the number of color index (C.I.) may be listed the following dyes. It is clear that the dyes are not limited to the following.

Direct yellow dye, C.I. 8, 11, 12, 27, 28, 33, 39, 44, 50, 58, 85, 86, 87, 88, 98, 100, 110.

Direct red dye, C.I. 2, 4, 9, 11, 20, 23, 24, 31, 39, 46, 62, 75, 79, 80, 83, 89, 95, 197, 201, 218, 220, 224, 225, 226, 227, 228, 230.

Direct blue dye, C.I. 1, 15, 22, 25, 41, 76, 77, 80, 86, 90, 98, 106, 108, 120, 158, 163, 168, 199, 226.

Acid yellow dye, C.I. 1, 3, 7, 11, 17, 23, 25, 29, 36, 38, 40, 42, 44, 76, 98, 99.

Acid red dye, C.I. 6, 8, 9, 13, 14, 18, 26, 27, 32, 35, 42, 51, 52, 80, 83, 87, 89, 92, 94, 106, 114, 115, 133, 134, 145, 158, 198, 249, 265, 289.

Acid blue dye, C.I. 1, 7, 9, 15, 22, 23, 25, 29, 40, 43, 59, 62, 74, 78, 80, 90, 100, 102, 104, 117, 127, 138, 158, 161.

Straight black is the first dye, C.I. 17, 19, 22, 31, 32, 51, 62, 71, 74, 112, 113, 154, 168.

Acid black dye, C.I. 2, 48, 51, 52, 110, 115, 156.

Reactive black dye, C.I. 1, 8, 12, 13.

Food black dye, C.I. 1, 2.

-Pigment

Examples of the pigment used in the present invention include carbon black and organic pigments. These pigments are used in the range of from 1 to 20 wt.%, preferably, from 2 to 12 wt.% in the calculation of the total amount of ink for an inkjet printer.

-Carbon black

Specific examples of carbon black include carbon-carbon black pigments, including chimney soot, lamp black, acetylene black and channel black, and are used, for example, Raven 7000, Raven 5750, Raven 5250, Raven 5000, Raven 3500, Raven 2000, Raven 1500, Raven 1250, Raven 1200, Raven 1190 ULTRA-II, Raven 1170, Raven 1255 (produced by Colombian Carbon), Black Pearls L, Regal 400R, Regal 330R, Regal 660R, Mogul L, Monarch 700, Monarch 800, Monarch 880, Monarch 900, Monarch 1000, Monarch 1100, Monarch 1300, Monarch 1400, and Valcan XC-72R, (produced by Cabot), Color Black FW1, Color Black FW2, Color Black FW2V, Color Black FW18, Color Black FW200, Color Black S150, Color Black S160, Color Black S170, Printex 35, Printex U, Printex V, Printex 140U, Printex 140V, Special Black 6, Special Black 5, Special Black 4A, Special Black 4 (manufactured by Degussa), № 25, № 33, № 40, № 47, № 52, № 900, № 2300, MCF-88, MA600, MA7, MA8, MA100 (manufactured by Mitsubishi Chemical). It is clear that carbon black is not limited to these, and usually known carbon black can also be used. In addition, small particles of magnetic materials, such as IAHS is Titus or ferrite, and titanium black, can be used as a black pigment.

-Organic pigment

Specific examples of organic pigments include insoluble azo-pigments such as toluidine red, toluidine red-brown, Hansa yellow, benzidine yellow and pyrazolone red; soluble azo-pigments such as Lithol red, Helio Bordeaux, Pigment Magenta and Permanent red 2B; derivatives VAT dyes such as alizarin, indanthren and thioindigo red-brown, phthalocyanine pigments, such as phthalocyanine blue and phthalocyanine green, chinaredorbit pigments, such as chinagreen red and chinagreen purple, Pereladova pigments such as perylene red and perylene crimson, isoindoline pigments, such as isoindoline yellow, isoindoline orange, imidazolone pigments, such as benzimidazolone yellow, benzimidazolone orange and benzimidazolone red, philanthropie pigments, such as pirastro red and pesantren orange, and other pigments, such as thioindigo pigments, condensed azo-pigments, plantron yellow, acylamide yellow, chiropteran yellow, Nickel azo yellow, copper-azomethine yellow, perinon orange, Andron orange, dianthraquinone red and dioxazine purple.

In units of the number of color index (C.I.) may be listed the following organizations is organic pigments. Clear that can be used other conventional organic pigments other than those listed.

Pigment yellow, C.I. 12, 13, 14, 17, 20, 24, 74, 83, 86, 93, 109, 110, 117, 120, 125, 128, 137, 138, 147, 148, 151, 153, 154, 166, 168.

Pigment orange, C.I. 16, 36, 43, 51, 55, 59, 61.

Pigment red, C.I. 9, 48, 49, 52, 53, 57, 97, 122, 123, 149, 168, 175, 176, 177, 180, 192, 215, 216, 217, 220, 223, 224, 226, 227, 228, 238, 240.

Pigment violet, C.I. 19, 23, 29, 30, 37, 40, 50.

Pigment blue, C.I. 15, 15:1, 15:3, 15:4, 15:6, 22, 60, 64.

Pigment green 7 C.I., 36.

The brown pigment, C.I. 23, 25, 26.

-Dispersant additive

When using the above-mentioned carbon black carbon and organic pigment together with them can be used dispersant. As such a dispersant typically use one that can provide a stable dispersion of the above-mentioned pigment in an aqueous environment, the influence of anionic groups. Specific examples of the dispersant include a styrene-acrylic acid copolymer is a styrene-acrylic acid-alkilany ester of acrylic acid, copolymer of styrene-maleic acid copolymer, styrene-maleic acid-alkilany ester of maleic acid, copolymer of styrene-methacrylic acid, copolymer of styrene-methacrylic acid-alkilany ester of acrylic acid, copolymer of styrene-complex polyether maleic acid, a copolymer of vinylnaphthalene-acrylic acid, from which OLIMAR vinylnaphthalene-maleic acid, copolymer of styrene-maleic anhydride complex polyether maleic acid and their salts. Of these dispersing agents are preferred dispersant having a mass average molecular weight in the range of from 1,000 to 30,000, and particularly preferred are the dispersant having a mass average molecular weight in the range from 3000 to 15000.

-Satisfacgermany pigment

As the coloring agent may be used as the pigment which is dispersible in water without a dispersant thanks attached to the surface of an ionic group (anionic group), the so-called "satisfacgermany pigment". An example of such a pigment is satisfacgermany carbon black. Satisfacgermany carbon black is, for example, anionic carbon black having an anionic group attached to its surface.

-Anionic carbon black

Examples of the anionic carbon black is carbon black having at least one anionic group selected from the group consisting of-COOM, -SO3M, -PO3HM-PO3M2attached to their surface. In the formulas, M represents a hydrogen atom, alkaline metal, ammonium or organic ammonium. One of them particularly excellent dispersibility in the ink has an anionic charged carbon CA is a, having attached to its surface group-SOOMA or-SO3M, which is therefore particularly suitable for use in the present invention.

That is represented by the symbol "M" in the above hydrophilic groups, specific examples of alkali metals include Li, Na, K, Rb and Cs. In addition, specific examples of the organic ammonium include methylammonium, dimethylammonium, ammonium, ethylamine, diethylamine, triethylamine, ethanolamine, diethanolamine and triethanolamine.

The ink of the present invention, containing camodisplay carbon soot, in which M is ammonium or organic ammonium, can further improve the water resistance of printed images, and the ink are particularly suitable in this respect. This, as it seems, is because, when the ink applied to the print media, the ammonia is decomposed and vaporized ammonia. Camodisplay carbon soot, in which M is ammonium, receive, for example, by way of replacing the alkali metal M samodoprinos carbon black to the ammonium ion exchange method, or the manner in which you add acid to transform M into N-type, and then add ammonium hydroxide to transform M into ammonium.

Examples of methods of obtaining the anionic carbon black is the way, on to the mu carbon black is subjected to oxidation treatment with sodium hypochlorite. According to this method, the group-COONa can be chemically linked to the surface of carbon black.

The above-described hydrophilic groups can be directly attached to the surface of carbon black. Alternatively, it may be not directly related to the surface of carbon black, allowing another atomic group to be present between the surface of the carbon black and the hydrophilic group. Specific examples of other atomic groups include linear or branched alkylenes group having from 1 to 12 carbon atoms, substituted or unsubstituted fenelonov group, and substituted or unsubstituted Neftyanoy group. Examples of the substituents phenylenebis group and Neftyanoi groups include linear or branched alkyl group having from 1 to 6 carbon atoms. In addition, specific examples of combination of the other atomic group and the hydrophilic group include-C2H4COOM, -Ph-SO3M-Ph-COOM (Ph represents fenelonov group).

In the present invention two or more of the above examples samodoprinos carbon black may be appropriately selected and used as the coloring matter of the ink. The number samodoprinos carbon black to be added in the ink is preferably from 0.1 wt.% or more to 15 wt.% or less, particularly preferably from 1 wt.% and what or more to 10 wt.% or less based on the total amount of ink. Setting the number samodoprinos carbon black in this interval, can well maintain the ink in a state of dispersion samodoprinos carbon black. Moreover, to control the color tone as the coloring material may be added to the dye in addition to samodoprinos carbon soot.

-Painted fine and microencapsulated pigments

In addition to the above-described coloring materials may be used pigments, microencapsulated polymer, or colored fine particles obtained by coating particles of the resin coloring materials. Although microcapsules are dispersible in aqueous medium, the ink may also contain a dispersant such as described above, in order to improve the stability of the dispersion. In addition, when the coloring material used colored fine particles, preferably using the above-described anionic dispersant.

Water environment

In the present invention can be suitably used water or a mixed solvent of water and a water-soluble organic solvent, with the limitation that can be achieved the effect of adding and not harm the purposes and effects of the present invention.

Specific examples of waderas Voronovo organic solvent include alkyl alcohols, having from 1 to 4 carbon atoms, such as methyl alcohol, ethyl alcohol, n-propyl alcohol, isopropyl alcohol, n-butyl alcohol, sec-butyl alcohol and tert-butyl alcohol; amides such as dimethylformamide and dimethylacetamide; ketones or ketaspire, such as acetone and datetoday alcohol; ethers such as tetrahydrofuran and dioxane; polyalkylene glycols, alkalophile, which Allenova group has from 2 to 6 carbon atoms, such as ethylene glycol, propylene glycol, butyleneglycol, triethylene glycol, thiodiglycol, hexyleneglycol and diethylene glycol; glycerin; ethers, lower Akilov polyhydric alcohols, such as onomatology (or monotropy) ether of ethylene glycol, onomatology (or monotropy) ether of diethylene glycol and onomatology (or monotropy) ether of triethylene glycol; N-methyl-2-pyrrolidone, 2-pyrrolidone and 1,3-dimethyl-2-imidazolidinone. The above water-soluble organic solvents may be used singularly or in a mixture. Further, as water is preferable to use deionized water (ionoobmennoi water).

Other components

In addition to the above components in the ink for inkjet printer, if necessary, can be added to the humidifier. Additionally, to achieve the desired values of the properties can be is obavljeni a viscosity modifier, the pH regulator, a surfactant, non, with the limitation that will be provided the effect of adding and not harm the purposes and effects of the present invention.

Properties

Appropriate spacing of the ink jet printer of the present invention are (at about 25° (C) a pH of from 3 to 12, preferably from 7 to 10, the surface tension of from 10 to 60 Dyne/cm, preferably from 10 to 40 Dyne/cm and a viscosity of from 1 to 30 JV, preferably, from 1 to 5 SP.

Apparatus for inkjet printing

By using the ink for inkjet printer according to the present invention described above, it is possible to reduce or prevent the occurrence of curl, and can be achieved such properties as excellent ejection stability when the ink jet printing are on the media. The inkjet printing apparatus according to the present invention includes the printing unit is equipped with a ink container containing the above ink, and the head part for ejection of ink, and an ink cartridge equipped with an ink container containing ink.

The printing apparatus suitable for carrying out printing using the ink for inkjet printer according to the present invention, is an apparatus that draws in accordance with the signal on the printing thermal or mechanical e is ergiu to the ink inside the printhead, which has an ink containing an ink container which energy generates ink droplets.

Figure 3 shows an example of the inkjet printing apparatus that is attached above the head. Figure 3 reference number 61 denotes a blade, which is cleaned by the element, and one end of the knife is supported and fixed bearing of the knife element, forming a cantilever end. The knife 61 is placed in position adjacent to the area where the printhead performs printing, and in the example shown in figure 3, the knife is held in such a way that he comes to the track, which moves the printhead. Reference number 62 denotes a cap which is placed in a starting position adjacent to the knife 61. The cover is configured such that it moves in the direction perpendicular to the direction of movement of the printhead to close the crown, when it comes in contact with the ejecting face. Reference number 63 figure 3 denotes an ink absorber placed adjacent the blade 61, which is held so that it is on the track of movement of the print head, as it makes the knife 61.

Above the knife 61, cap 62 and the absorber 63 constitute the block 64 recovery ejection, the blade 61 and the absorber 63 serve to remove moisture and dust from the face of the ejection port of the ink. Reference number 65 refers to the printhead, to ora has a device for generating ejecting energy and conducts printing by ejection of ink on the print media, facing to the edge of the ejection port with the ejection channel. Reference number 66 denotes a carriage on which it is mounted, to move the print head 65. The carriage 66 is appropriately introduced into engagement with the leading rod 67, and part of the carriage 66 is attached to a belt 69 driven by a motor 68. Thus, the carriage 66 can move along the guide rod 67, and the print head 65 can move the print area and in adjacent areas.

Reference number 51 indicates a piece of paper, you can insert the media and which is driven by a motor, not shown in the figure. With this design the media is served when it is printed, in a position facing to the edge of the ejection port of the ink print head and the media is delivered through a portion of the output paper, provided with a roller 53 in the paper output.

In the above-described construction, when the print head returns to its original position after printing the cover 62 of the block 64 recovery ejection departs from the route of movement of the print head 65, but the knife 61 is on the route of movement. The result is wiped of the face of the ejection port of the print head 65. When the cap 62 closes the print head 65 in contact with the face of ejection port of the head, the cap 62 moves so that is to be on the track of movement of the printhead.

When the print head 65 moves from its original position to the position at which printing starts, the cap 62 and the knife 61 are in the same positions as the position of the cleaning described above. In the face of the ejection port of the print head 65 is wiped also during this movement. The above movement of the print head to its home position is made not only when the printing is completed or ejection restored, but also when the print head is moving in the print area for printing. The print head moves to its original position adjacent to the print area, within a predefined distance, and the movement of the head is wiped, as described above.

Figure 4 is a cross section illustrating an example of an ink cartridge 45 containing ink, which is supplied to the head through the ink supply element, such as a tube. In the figure the reference number 40 denotes an ink container containing ink supplied, for example, an ink bag, and a rubber stopper 42 is inserted into the tip. By inserting a needle (not shown in the figure) in the tube 42, the ink in the ink bag 40 can be enjoyed in the head. Reference number 44 denotes an ink absorber for receiving excess ink.

The inkjet printing apparatus used in the present invention, n is limited in which the head and the ink cartridge are separated, as described above, but can also be used in those vehicles in which they are integrally formed, as shown in figure 5. Figure 5 reference number 70 denotes a printing block, which contains an ink container containing the ink, such as ink absorber, and it is arranged so that the data contained in the absorber ink is ejected in the form of droplets through the head portion 71 having multiple nozzles. Reference number 72 denotes an air communication channel for messages inside of the printing unit with air. The printing unit 70 is used instead of the print head 65 shown in figure 3 and detachable from the carriage 66.

6 shows an example of an ink cartridge, which can be attached to the aforementioned apparatus for inkjet printing. The cartridge 1012 in this example is a cartridge serial type, and its main part is formed by the cylinder 100 inkjet printing and tank 1001 for liquids containing liquid, such as ink. The head 100 inkjet printing has a lot ejection holes 832 for ejection of the liquid, and the liquid such as ink is introduced into the common liquid chamber of the head 100 of the ejection of the liquid from the tank 1001 fluid through the fluid supply, not shown in the figure. The cartridge 1012, shown in Fig.6, is constructed so that g is dexterous 100 inkjet printing and capacity 1001 fluid was integrally formed, allowing fluid to be served in the capacity of 1001 liquid according to need, but it is also possible to apply a structure in which the capacity of 1001 fluid replaceable attached to the head 100 of the ejection liquid.

EXAMPLES

Hereinafter in the present description will be given detailed explanation with examples and comparative examples, but the present invention is not limited to the following examples as long as there is no deviation from the subject of the present invention. In the following description, "part (s)" and "%" are given in terms of weight, unless otherwise indicated.

Examples 1 to 10, comparative examples 1 to 4, reference example 1

Preparation of ink

The components were mixed according to the following table 1, sufficiently mixed, and the mixture is then filtered under pressure through a membrane filter having a pore size of 0.2 μm to obtain ink 1-10, comparative ink 1-4 and reference ink 1. Reference ink 1 contain only water-soluble organic compound 1. Table 2 shows the data on X and Y, and X+Y and Y/X.

Table 2
InkX (wt.%)Y (wt.%)X+Y (wt.%)Y/XWater (wt.%)
Example1Ink 110,05,015,00,5081,0
2Ink 2of 17.015,032,00,8864,0
3Ink 313,02,015,00,1581,0
4Ink 4of 17.013,030,00,7666,0
5Ink 515,013,028,00,8768,0
6Ink 615,013,028,00,8768,0
7Ink 715,013,028,00,8768,0
8Ink 815,013,028,00,8768,0
9Ink 915,05,020,00,3376,0
ÈA; 10Ink 1015,010,025,00,6771,0
Comparative hydrated sample1Comparative ink 110,010,020,01,0076,0
2Comparative ink 29,05,014,00,5682,0
3Comparative ink 39,08,0of 17.00,8979,0
4Comparative ink 410,02,0to 12.00,2084,0
Reference example1Reference ink 120,00,020,00,0076,0

Evaluation of the phenomenon of Curling

The obtained ink was applied onto the media using an inkjet printing apparatus having meet the requirements multipicity head that ejective ink, applying the ink thermal energy in accordance with the signal to print. Used inkjet printing apparatus had a structure shown in Fig., and had a volume of ejection of 2.8 square on point, the print density 2400×1200 dpi. In relation to the excitation conditions used, the apparatus having the excitation frequency of 10 kHz, and printing was performed at a load of printed 100%. The print used two-pass printing, in which the scanning of the printing is carried out twice. Used by the media was paper A4 PPC (produced by Canon Inc.). Printing conditions were the same in the examples, comparative examples and reference example.

-The methodology to assess the effects of the curl

Printed materials were left in an environment at a temperature of 24°C and humidity of 50% for 1 hour, 1 day, 4 days and 7 days and measured the degree of the phenomenon of twisting in time. Paper twisted into MAGNETOM direction of paper was evaluated as "+" (positive phenomenon twisting), paper twisted into a convex direction sign "-" (negative phenomenon twisting). The distance from the top of the rolled paper to the ground plane was measured with a ruler. Criteria for assessing the effects of torsion are the following. The evaluation results are shown in table 3. Criteria for assessing the effects of torsion are the following:

AA: within ± 10 mm

A: more ± 10 mm, within ± 25 mm

In: more ± 25 mm ± 40 mm

From: the edge of the paper bent backwards,

D: edge of securities is curled inward.

Evaluation of ejection stability

The prepared ink was applied onto the media using multipicity head that ejective ink, applying the ink thermal energy in accordance with the signal to print. Used inkjet printing apparatus had a structure shown in figure 3, and had a volume of ejection of 2.8 square on point, the print density 2400×1200 dpi. In relation to the excitation conditions used, the apparatus having the excitation frequency of 10 kHz, and printing was performed at a load of printed 100%. The print used two-pass printing, in which the scanning of the printing is carried out twice. Used by the media was paper A4 PPC (produced by Canon Inc.). Printing conditions were the same in the examples, comparative examples and reference example.

-Methods of evaluating the stability of ejection 1 (ejection after leaving head)

To assess the stability of ink ejection observed the occurrence of problems such as clogging of nozzles, noting, did you have unstable printing or blurring of the image when printed after the above-mentioned ink was filled in the head and left for 1 month. Criteria for the evaluation of ejection stability 1 (ejection after leaving the head) were the following. The evaluation results are shown in table 3.

A: no blur

Q: there is a small the traveler blur, but practically no problem,

With: there is blurring, with images there are problems,

D: sometimes there is a lack of ejection.

-Methods of evaluating the stability of ejection 2 (starting characteristic)

To assess the stability of ink ejection observed the occurrence of instability or blur print the header portions at the beginning of printing in the environment 1 (normal temperature, normal humidity) and the environment 2 (temperature 15°C, humidity 10%). Criteria for the evaluation of ejection stability 2 (switching characteristics) were the following. The evaluation results are shown in table 3.

A: no blur

A: no blur the image a bit fuzzy, but practically no problem,

From: begins partial blur, with images, there are problems,

D: begins partly strong blurring.

Table 3

InkThe phenomenon of CurlingThe stability of ejection 1The stability of ejection 2
1 hour1 day4 days7 daysWednesday 1Wednesday 2
When the er 1Ink 1AndAndInInInD
2Ink 2AAAAInInInD
3Ink 3AndAndAndAndInInD
4Ink 4AAAAAndInInInD
5Ink 5AAAAAndInInInD
6Ink 6AAAAAndInInInC
7Ink 7AAAAAndInInInD
8Ink 8AAAAAndInIn InC
9Ink 9AndAndAndAndInInC
10Ink 10AAAAAndInInInD
Comparative example1Comparative ink 1InDInInD
2Comparative ink 2InInInInD
3Comparative ink 3InInDInInD
4Comparative ink 4InInInInInInD
Reference example1Reference ink 1AAAAAndAndDInD

Examples 11-19, comparative examples 5 and 6

Preparation of ink

The components were mixed according to the following table 4, sufficiently mixed, and the mixture is then filtered under pressure through a membrane filter having a pore size of 0.2 μm to obtain ink 11-19 and comparative inks 5 and 6. Table 5 shows data X1X2, Y1and X1+X2X2+Y1X1+X2+Y1, Y1/(X1+X2) and (X2+Y1)/X1.

Evaluation of the phenomenon of Curling

The way to evaluate the effects of twisting is as described above. The evaluation results are shown in table 6.

Evaluation of ejection stability

A method of evaluating the stability of ejection 1 (ejection after leaving the head) and a method of evaluating the stability of ejection 2 (switching characteristics) are as described above. The evaluation results are shown in table 6.

This application claims the priority of Japanese patent application No. 2004-075391, filed on March 16, 2004, Japanese patent application No. 2004-075392, filed on March 16, 2004, Japanese patent application No. 2004-289652, filed October 1, 2004, and Japanese patent application No. 2005-072040 filed March 14, 2005, which is introduced in the present description by reference.

1. Ink for inkjet printer, comprising at least water, a colorant, a water-soluble organic substance 1 and the water-soluble organic substance 2,

where the viscosity of the ink is from 1 to 5 CPS (at 25°and

the water content is 62 wt.% or more to 77 wt.% or less of the total amount of ink for an inkjet printer, and

the content X of the water-soluble organic substance 1 is 10 wt.%, or more to 18 wt.% or less of the total amount of ink for an inkjet printer, and

the content Y of the water-soluble organic substance 2 is 2.0 wt.% or more to less than 15 wt.% from the total amount of the ink for inkjet printer, and

the content X (%) water-soluble organic substance 1 and the content Y (%) water-soluble organic matter 2 satisfies the following formula (I) and formula (II):

(I) 0,15≤Y/X≤0,9;

(II) 15 wt.%≤X+Y≤32 wt.%,

and water-soluble organic compound 1 is a hydrophilic water-soluble organic compound having a difference between the moisture-retention ability in an environment with a temperature of 23°C and humidity of 45% and the moisture-retention ability in an environment with a temperature of 30°C and humidity 80% of 36% or less, and

vocarstvo imoe organic compound 2 is a water-soluble organic compound, other than the colorant and the water-soluble organic compounds 1.

2. Ink for inkjet printer according to claim 1, in which the water-soluble organic compound 1 is a polyhydric alcohol having amide bond.

3. Ink for inkjet printer according to claim 1, in which the water-soluble organic compound 1 is a polyhydric alcohol having a sulfonic group.

4. Ink for inkjet printer according to claim 1, in which the sum X+Y of the contents of water-soluble organic compound 1 and a water-soluble organic compound 2 is 20 wt.%≤X+Y±32 wt.% in calculating the total amount of ink for an inkjet printer.

5. Ink for inkjet printer according to claim 4, in which the sum X+Y is 25 wt.%≤X+Y≤32 wt.%.

6. Ink for inkjet printer according to claim 1, in which the water content is 62 wt.% or more to 71 wt.% or less.

7. Ink for inkjet printer according to claim 1, in which the difference between the ability to capture water is 40% or more.

8. Ink for inkjet printer, comprising at least water and a dye, additionally comprising a water-soluble organic compound 1-1, water-soluble organic compound 1-2 and water-soluble organic compound 2,

where the content of X1(%) water-soluble organic in the company's 1-1 in the calculation of the total amount of ink for inkjet printer the content of X2(%) water-soluble organic matter in 1-2 based on the total amount of ink for inkjet printer and the contents of Y1(%) water-soluble organic substance 2 in the calculation of the total amount of ink for an inkjet printer meets the ratios of the following formulas(1)-(3):

(1) 0,1≤(X2+Y1)/X1≤2,5;

(2) 10 wt.%≤X1+X2≤18.0 wt.%;

(3) 3 wt.%≤X2+Y1≤20.0 wt.%,

and water-soluble organic compound 1-1 is a water-soluble polyhydric alcohol or a water-soluble amide compound having the difference between water-holding capacity in the environment with temperature of 23°C and humidity of 45% and the moisture-retention ability in an environment with a temperature of 30°C and humidity 80% of 36% or less and a molecular weight of MWin the range of 100≤MW≤1000, and

water-soluble organic compound 1-2 is a water-soluble alkanediols with the difference between the moisture-retention ability in an environment with a temperature of 23°C and humidity of 45% and the moisture-retention ability in an environment with a temperature of 30°C and humidity 80% of 36% or less and a molecular weight of MWin the range of 100≤MW≤150, alkanediols, optionally containing g is the SCP-HE is on both ends of the main circuit, and

water-soluble organic compound 2 is a water-soluble organic compound other than the dye, water-soluble compounds 1-1 and water-soluble compounds 1-2.

9. Ink for inkjet printer of claim 8, in which the water-soluble organic compound 1-1 is a polyhydric alcohol having amide bond.

10. Ink for inkjet printer of claim 8, in which the water-soluble organic compound 1-1 is a polyhydric alcohol having a sulfonic group.

11. Ink for inkjet printer according to claim 9, in which the sum of X1+X2+Y1contents of water-soluble organic compound 1-1, water-soluble organic compound 1-2 and water-soluble organic compound 2 is 20 wt.%≤X1+X2+Y1≤32,0 wt.% in calculating the total amount of ink for an inkjet printer.

12. Ink for inkjet printer according to claim 11, in which X1+X2+Y125 wt.%≤X1+X2+Y1≤32,0 wt.%.

13. Ink for inkjet printer of claim 8, in which the content of X1(%) water-soluble organic compound 1-1, the content of X2(%) water-soluble organic compound 1-2 and the content of Y1(%) water-soluble organic compound 2 is additionally satis who meets the relationship of the following formula (4):

(4) 0<Y1/(X1+X2)≤0,9.

14. Ink for inkjet printer of claim 8, in which the water content is 62 wt.% or more to 77 wt.% or less based on the total amount of ink for an inkjet printer.

15. Ink for inkjet printer 14 in which the water content is 62 wt.% or more to 71 wt.% or less.

16. Ink for inkjet printer of claim 8, in which the content of Y1water-soluble organic substance 2 is 2.0 wt.% or more to less than 15 wt.% and the difference between the ability to capture water is 40% or more.

17. Method of inkjet printing according to the invention, which comprises applying ink to an inkjet printer according to claim 1 or 8 on the recording media through the inkjet head of the printer to form the image.

18. Ink cartridge according to the present invention containing ink for inkjet printer according to claim 1 or 8.

19. Apparatus for inkjet printing according to the present invention equipped with the above-mentioned ink for inkjet printer according to claim 1 or 8.

20. Ink for inkjet printer according to claim 1, in which the water-soluble organic compound 1 is at least one selected from the group consisting of polyethylene glycols having an average molecular weight of 200, 300, 400, 600 and 1000, 1,2,6-hexanetriol, trimethylolpropane, Tr is metrolitan, pentaerythritol, diglycerin, glucose, sorbitol, bis-hydroxyethylation, N,N′bis-(2-hydroxyethyl)urea, Tetra-(2-hydroxyethyl)phenyldiamine, 1,5-pentanediol, 1,6-hexandiol, 1,7-heptanediol, 3-methyl-1,5-pentanediol, 2-amino-2-methyl-1,3-propane diol and 2-amino-2-ethyl-1,3-propane diol.

21. Ink for inkjet printer according to claim 1 or 8, in which the water-soluble organic compound 2 is at least one selected from the group consisting of urea, ethylene glycol, 2-pyrrolidone, etelemetry, glycerol and diethylene glycol.

22. Ink for inkjet printer according to claim 1, in which the water-soluble organic compound 2 is at least glycol.

23. Ink for inkjet printer according to claim 1, in which the water-soluble organic compound 1 is at least one selected from the group consisting of polyethylene glycols having an average molecular weight of 200, 300, 400, 600 and 1000, 1,2,6-hexanetriol, trimethylolpropane, trimethanolamine, pentaerythritol, diglycerin, glucose, sorbitol, bis-hydroxyethylation, N,N′bis-(2-hydroxyethyl)urea, Tetra-(2-hydroxyethyl)phenyldiamine, 1,5-pentanediol, 1,6-hexandiol, 1,7-heptanediol, 3-methyl-1,5-pentanediol, 2-amino-2-methyl-1,3-propane diol and 2-amino-2-ethyl-1,3-propane diol, and

water-soluble organic compound 2 is at least about is him, selected from the group consisting of urea, ethylene glycol, 2-pyrrolidone, etelemetry, glycerol and diethylene glycol.

24. Ink for inkjet printer of claim 8, in which the water-soluble organic compound 1-1 is at least one selected from the group consisting of polyethylene glycols having an average molecular weight 200, 300, 400, 600, 1000, 1,2,6-hexanetriol, trimethylolpropane, trimethanolamine, pentaerythritol, diglycerin, glucose, sorbitol, bis-hydroxyethylation, N,N′bis-(2-hydroxyethyl)urea, Tetra-(2-hydroxyethyl)phenyldiamine.

25. Ink for inkjet printer of claim 8, in which the water-soluble organic compound 1-2 is at least one selected from the group consisting of 1,5-pentanediol, 1,6-hexandiol, 1,7-heptanediol, 3-methyl-1,5-pentanediol, 2-amino-2-methyl-1,3-propane diol and 2-amino-2-ethyl-1,3-propane diol.

26. Ink for inkjet printer of claim 8, in which the water-soluble organic compound 1-1 is at least one selected from the group consisting of polyethylene glycols having an average molecular weight 200, 300, 400, 600, 1000, 1,2,6-hexanetriol, trimethylolpropane, trimethanolamine, pentaerythritol, diglycerin, glucose, sorbitol, bis-hydroxyethylation, N,N′bis-(2-hydroxyethyl)urea, Tetra-(2-hydroxyethyl)phenyldiamine, and

water-soluble of the organic compound 1-2 is at least one selected from the group consisting of 1,5-pentanediol, 1,6-hexandiol, 1,7-heptanediol, 3-methyl-1,5-pentanediol, 2-amino-2-methyl-1,3-propane diol and 2-amino-2-ethyl-1,3-propane diol, and

water-soluble organic compound 2 is at least one selected from the group consisting of urea, ethylene glycol, 2-pyrrolidone, etelemetry, glycerol and diethylene glycol.



 

Same patents:

FIELD: print engineering.

SUBSTANCE: invention provides ink containing first fluorescent color material emitting fluorescence at specified emission wavelength used for measurement or determination of excitement at specified excitement wavelength; and second fluorescent color material emitting fluorescence when excited at specified excitement wavelength, said second color material being contained in larger amount than said first color material. To obtain fluorescence at desired emission wavelength, excitement spectrum of the first color material in ink should have peak wavelength range adjoining specified fluorescent wavelength, and emission fluorescence spectrum of the second color material has emission wavelength range that includes at least above-mentioned peak wavelength range.

EFFECT: enhanced fluorescence intensity due to presence of several fluorescent coloring substances.

9 cl, 26 dwg, 3 tbl, 6 ex

FIELD: light industry; composition of decorative coats for wallpaper; manufacture of pearly ink for intaglio printing on wallpaper.

SUBSTANCE: composition of proposed printing ink for wallpaper contains 16-16.5 mass-% of pearly pigment; 12-12.5 mass-% of ethyl alcohol; 46-46.4 mass-% of binder - acrylic latex of butyl acrylate copolymer (19-21%) and methacrylic acid (10-12%) and water; copolymer acrylic latex is produced by method of radiation emulsion polymerization of butyl acrylate, vinyl acetate and methacrylic acid under action of ionizing radiation at dose rate of 0.05-0.1 g/s to absorbed doses of 1.5-2 kgr.

EFFECT: avoidance of lamination of ink; easily washable ink; enhanced heat resistance of ink.

1 tbl, 2 ex

FIELD: nonferrous metallurgy industry; aircraft industry; other industries; production of the heat-resistant alloys on the basis of the nickel.

SUBSTANCE: the invention is pertaining to the dispergated coloring agents intended for the ink-jet recording. The invention describes the dispergated coloring agent containing the coloring agent and the pseudo-finely-dispergated particles of the polarizable polymer having the dimension less, than the particles of the coloring agent. In the dispergated coloring agent the coloring agent itself and the particles of the polarizable polymer are attached to each other. At that the pseudo-finely-dispergated particles of the polarizable polymer contain the interpolymer consisting of the monomeric components containing, at least, one type of the hydrophobic monomer and, at least, one type of the hydrophilic monomer, where the hydrophobic monomer contains, at least, the monomer having the methyl group in α - position and the radically-polymerizable non-saturated double bond. The invention also describes the method of production of the indicated dispergated coloring agent and the water ink produced on its basis. The presented dispergated coloring agent has the high stability for a long time and practically in the absence of the surface-active substance or the dispergator. The ink produced on its basis has stability of blowout in the ink-jet printing method.

EFFECT: the invention ensures, that the ink produced on the basis of the presented dispergated coloring agent has the high stability of blowout in the ink-jet printing method.

20 cl, 14 dwg, 7 tbl, 15 ex

FIELD: printing materials.

SUBSTANCE: invention relates to printing ink containing first colorant and second colorant, at least one of the colorants including fluorescent color. First and second colorants are located separately on a printing medium while printing ink ensure obtaining printed image with improved fluorescent properties. Invention further relates to printed image and a method of forming printed image utilizing such ink. Invention solves the problem of reducing fluorescence and improving fluorescent properties by way of separating fluorescence region and colored region as well as by way of formation of area on printing medium wherein points of coagulated first colorant are spread in the region of fixed second colorant so that absorption of fluorescent emission energy from fluorescent colorant is considerably reduced by coexisting colorant involving corresponding technologies. The latter are based on a novel technical conception residing in improvement of characteristics of fluorescent emission of a second colorant used in printing ink including a first fluorescent colorant, which, being excited at specified excitation wavelength, fluoresces within specified wavelength range.

EFFECT: improved fluorescent properties of printed image.

15 cl, 31 dwg, 4 tbl, 33 ex

FIELD: printing engineering.

SUBSTANCE: invention, in particular, relates to a method of printing allowing protection of printing materials against counterfeit reprints, for instance in fabrication of banknotes, shares, checks, and other valuable paper documents. Invention provides printing liquid for printing through narrow nozzles onto objects, in particular when fabricating banknotes, shares, and checks, which liquid comprises carrying medium and nanoparticles of metal salts in the form of crystalline solid particles having average diameter less than 300 nm, which fluorescent and phosphorescent when excited by UV emission of the A, B, or C band, or visual light, while emitted fluorescent and phosphorescent waves do not lie in the visual light frequency region and excitation frequency region and emission frequency region are shifted in frequency scale. Nanoparticles contain enhancing additives of at least one type having excitation and emission frequency ranges corresponding to fluorescence and phosphorescence. Provided is also printing method including injecting of above-described liquid(s) through one or several narrow nozzles, which are regulated individually or by groups in relation to availability or lack of printing liquid and in relation to duration or intensity of flowing of printing liquid. Printing method is either piezoelectric method or jet printing one. Employment of proposed liquid for ink-pots and object marking, in particular when fabricating banknotes, shares, and checks involving printing equipment provided with one or several narrow nozzles is also described.

EFFECT: increased reliability of protection.

15 cl, 2 dwg

FIELD: chemical industry; printing industry; powder metallurgy industry; cosmetic industry; other industries; production and application of the highly anticorrosive metallic pigments.

SUBSTANCE: the invention is pertaining to production of the of the highly anticorrosive metallic pigments similar to laminas, which may be used in production of the printing ink, plastic materials, cosmetics, the powder coatings and in other branches of industry. The pigments have on their surfaces: the metallic substrates similar to the laminas and treated with the compounds of the phosphoric acid and-or the compounds of the boric acid; one or more layers of the coatings consisting of one or more hydrated oxides of the metals of one or more metals selected from the group, which includes silicon, aluminum, zirconium, titanium and tin. On the basis of the highly corrosive metallic pigments similar to laminas it is possible to produce the interferential colored pigments. The invention allows to increase the anticorrosive resistance of the metallic pigments at the expense of saving without the faults of the initial surface smoothness of the similar to the laminas metallic substrates, to increase the homogeneity and density of the layers of the hydrated oxides of the metals.

EFFECT: the invention ensures the increased anticorrosive resistance of the metallic pigments, saving the initial surface smoothness of the similar to the laminas metallic substrates, the increased homogeneity and density of the layers of the hydrated metals oxides.

40 cl, 9 ex, 4 tbl, 8 dwg

FIELD: chemical industry; computer industry; methods of production of the pigments used in the coatings of the registering medium of ink-jet systems.

SUBSTANCE: the invention is pertaining to production of the pigments suitable for usage in the compositions of the registering mediums used for the ink jet printing. The invention provides, that the surface of the pigmental loose material is subjected to action of the water-soluble salt of the polyvalent metal in the aqueous medium. The treated surface of the particles gains the sizeable cationic surface charge. The salt represents the metal salt of the Group II or the Group III of Periodic table. The registering mediums for the ink-jet printing treated with the coating composition containing the indicated pigment ensure the high density fast-drying and anti-bleeding colorful images with the sufficient water-resistance. The compositions used for creation of the coating also have the advantage pertaining to the net cost and to the improved rheology at the more higher content of the pigment in the coating as compared with the coatings based on the siliceous pigments.

EFFECT: the invention ensures production of the coatings with the indicated pigment having the high density, fast-drying and anti-bleeding colorful images with the sufficient water-resistance at the low net cost, the improved rheology at the more higher content of the pigment in the coatings, as compared with the coatings based on the siliceous pigments.

30 cl, 5 dwg, 7 tbl, 7 ex

FIELD: special compositions.

SUBSTANCE: invention relates to compositions used in preparing heat-protective covers based on silicon-containing ceramic hollow microspheres and able to withstand strong temperature drops. Composition for preparing heat-protective cover comprising hollow ceramic microspheres as a filling agent, a polymeric binding agent, technological additive and water involves hollow ceramic microspheres of specific mass 450-750 kg/m3, hardness value by Mohs scale 5.0-6.0 as a filling agent and in the following distribution of particles by sizes, wt.-%: basis diameter 250-350 mcm, 30-62; diameter 5-10 mcm, 15.0-20.0; diameter 10-30 mcm, 5.0-30.0; diameter 30-50 mcm, 5.0-30.0; diameter 60-100 mcm, 8.0-10.0; diameter 100-250 mcm, 5.0-10.0; as a polymeric binding agent the composition comprises latex chosen from group involving: modified acryl acetate latex, 33-38% latex of copolymer of butadiene, acrylonitrile and methacrylic acid, copolymer of styrene and n-butyl acrylate in the ratio 1:1 by mass; as a technological additive the composition comprises a froth breaker chosen from group comprising: silicon froth breakers, tributyl phosphate, polyester derivatives of fatty acids in the following ratio of components, wt.-%: abovementioned microspheres, 18-32; abovementioned froth breaker, 0.01-1.0; abovementioned binding agent, 8.0-12.0, and water - up to 100. Invention provides expanding assortment of compositions for preparing heat-protective covers, enhancing heat-protecting, heat-physical indices of cover with high uniformity and cohesion strength of cover with a basis, expanding region of working temperature from -60°C to +260°C. Invention can be used in filed of building, machine engineering, aviation, railway transport wherein surfaces require conferring heat-protective properties in exploitation of covers under rigid temperature conditions.

EFFECT: improved and valuable technical properties of composition.

2 tbl

FIELD: chemical industry; printing industry; other industries; methods of production of the composition of the paint including the optically changeable pigments.

SUBSTANCE: the invention may be used in production of the optically changeable pigments. The optically changeable pigment includes the stratified set composed of the different materials, in which, at least, one of the layers represents the reflecting layer and, at least, one of the other layers represents the dielectric layer. At least, one of the surfaces of the indicated layers is subjected to the chemical action. The indicated materials also include, at least, one of the layers, which represents the semitransparent metallic layer made out of chromium and also one or more metals and-or their inorganic compounds. At that the metal and-or its inorganic compound are subject to corrosion. The subjected to the chemical action surface of the reflecting and dielectric layer along the edge of the layering block of the edge structure of the pigment is coated with the passivating agent, which is selected from the group consisting of the organic esters and the fluorinated organic esters of the phosphoric acid, having the following structural formula: (Rf-CH2-CH2-O)xP(O)(OH)y, where Rf=F-(CF2-CF2)z, х=1 or 2, у=2 or 1, х+у=3, z=l-7. The composition of the printing paint includes the binding system, water and the optically changeable pigment. The invention allows to diminish oxidation of the metallic layers and dissolution of the dielectric layers of the optically changeable pigment and to use it in the compositions of the printing paint.

EFFECT: the invention allows to diminish oxidation of the metallic layers and dissolution of the dielectric layers of the optically changeable pigment and to use it in the compositions of the printing paint.

22 cl, 7 ex

FIELD: marking and identification of protected articles, such as bank-notes, service papers, labels, foil, fiber, card or industrial products.

SUBSTANCE: proposed printing ink contains dyes or pigments of expanded or hyperchromatic color space which is not reproduced by means of standard 4-color reproducing equipment. Identification of marking includes mathematical conversion of non-processed spectral information into statically independent hyperchromatic coordinates and comparison of selected hyperchromatic coordinates with respective standard magnitudes. Specification gives also description of printing inks and method of marking and identification of articles.

EFFECT: enhanced efficiency.

25 cl, 6 dwg, 2 tbl, 4 ex

FIELD: polymer coatings.

SUBSTANCE: invention relates to using powder composition to coat jet printing materials utilized as visual information carriers. Powder composition contains (i) one or several powder silane-containing polyvinyl alcohols based on copolymers of fully or partially hydrolyzed esters having degree of hydrolysis from 75 to 100 mol % and (ii) one or several water re-dispersible polymer powders based on homopolymers or copolymers of one or several monomers selected from group including nonbranched or branched C1-C15-alkylcarboxylic acid vinyl esters, (meth)acrylic acid esters with C1-C15-alcohols, vinylaromatic compounds, olefins, dienes, and vinyl halides.

EFFECT: enabled manufacture of wear-resistant coatings to coat both paper and polymeric substrates, avoided undesired increase in viscosity during composition preparation procedure, and enabled more flexible variation in contents of solids in chalking mass.

10 cl, 15 ex

FIELD: printing materials.

SUBSTANCE: invention relates to printing ink containing first colorant and second colorant, at least one of the colorants including fluorescent color. First and second colorants are located separately on a printing medium while printing ink ensure obtaining printed image with improved fluorescent properties. Invention further relates to printed image and a method of forming printed image utilizing such ink. Invention solves the problem of reducing fluorescence and improving fluorescent properties by way of separating fluorescence region and colored region as well as by way of formation of area on printing medium wherein points of coagulated first colorant are spread in the region of fixed second colorant so that absorption of fluorescent emission energy from fluorescent colorant is considerably reduced by coexisting colorant involving corresponding technologies. The latter are based on a novel technical conception residing in improvement of characteristics of fluorescent emission of a second colorant used in printing ink including a first fluorescent colorant, which, being excited at specified excitation wavelength, fluoresces within specified wavelength range.

EFFECT: improved fluorescent properties of printed image.

15 cl, 31 dwg, 4 tbl, 33 ex

FIELD: image generation.

SUBSTANCE: image generation element includes chemical compound in crystalline form, which transforms to amorphous form, which has its own color, different from color of crystalline form. Image generation temperature mainly does not depend on time of heating.

EFFECT: increased efficiency.

2 cl, 8 app, 3 dwg

FIELD: image generation.

SUBSTANCE: image generation element includes chemical compound in crystalline form, which transforms to amorphous form, which has its own color, different from color of crystalline form. Image generation temperature mainly does not depend on time of heating.

EFFECT: increased efficiency.

2 cl, 8 app, 3 dwg

FIELD: method and device for colored flexography.

SUBSTANCE: method for applying multiple paint layers onto a substrate includes following stages: application onto a substrate of at least one painting layer of energy-hardened liquid paint with viscosity less than approximately 4000 centipoises, and including reaction-incapable paint thinner, where applied layer of energy-hardened paint has first viscosity; evaporation of at least a part of reaction-incapable paint thinner from applied paint layer for increasing viscosity of applied layer of energy-hardened paint; application onto substrate and applied layer of energy-hardened paint with increased viscosity of at least one layer of non energy-hardened liquid paint, viscosity of which is less than increased viscosity of previously applied layer of energy-hardened paint; and drying of both paint layers on the substrate. Another variant of method for applying multiple paint layers onto a substrate is differentiated by applied layer of energy-hardened paint having to be of increased viscosity compared to following layer of energy-hardened liquid paint with viscosity less than approximately 4000 centipoises, and containing reaction-incapable paint thinner, where viscosity of following layer is less than increased viscosity of energy-hardened paint layer applied beforehand. Also a method is suggested for printing multiple paint layers on a substrate, which includes stage of selection of first and second energy-hardened liquid flexography paint, where each paint contains viscosity controlling reaction-incapable paint thinner, consisting of water in amount of from 5% to 50% of thinner weight, where each paint has viscosity approximately ranging from 30 to 70 centipoises, and stage of serial application of first and second energy-hardened liquid flexography paint onto a substrate to create first and second paint layers, having overlapping parts, where second paint is applied only after at least a part of paint thinner is evaporated in first paint layer. Device for serial application of multiple overlapping paint layers onto a substrate contains substrate route and substrate drive for moving the substrate along a route, where paint application sections are adapted for applying paint onto substrate, which paint includes reaction-incapable paint thinner and has viscosity less than 4000 centipoises, and also management system, which manages transportation of substrate along a route. Viscosity of first layer of liquid paint, applied onto a substrate in one of paint sections, is increased due to evaporation of at least a part of paint thinner from first paint layer to higher viscosity compared to viscosity of second paint, applied on top of first paint layer in next paint section, located at a certain distance from first paint section, up to viscosity, sufficient for "crude" application of second liquid paint layer during transportation of substrate between paint sections.

EFFECT: in suggested methods, relief printing is achieved without insignificant modifications of printing equipment.

4 cl, 2 dwg

FIELD: chemical industry; computer industry; methods of production of the pigments used in the coatings of the registering medium of ink-jet systems.

SUBSTANCE: the invention is pertaining to production of the pigments suitable for usage in the compositions of the registering mediums used for the ink jet printing. The invention provides, that the surface of the pigmental loose material is subjected to action of the water-soluble salt of the polyvalent metal in the aqueous medium. The treated surface of the particles gains the sizeable cationic surface charge. The salt represents the metal salt of the Group II or the Group III of Periodic table. The registering mediums for the ink-jet printing treated with the coating composition containing the indicated pigment ensure the high density fast-drying and anti-bleeding colorful images with the sufficient water-resistance. The compositions used for creation of the coating also have the advantage pertaining to the net cost and to the improved rheology at the more higher content of the pigment in the coating as compared with the coatings based on the siliceous pigments.

EFFECT: the invention ensures production of the coatings with the indicated pigment having the high density, fast-drying and anti-bleeding colorful images with the sufficient water-resistance at the low net cost, the improved rheology at the more higher content of the pigment in the coatings, as compared with the coatings based on the siliceous pigments.

30 cl, 5 dwg, 7 tbl, 7 ex

FIELD: pulp-and-paper industry.

SUBSTANCE: coating composition consisting of ink-compatible pigment, binder, and cationic fixative is deposited onto one of the sides of based paper and the other side is covered with detwisting coating, after which coating is ennobled by means of supercalendering. As pigment, mixture of amorphous silicon dioxide with calcium carbonate or kaolin with outer specific surface 60-85 m2/g at ratio (25-50):(75-50). Binder is a mixture of polyvinyl alcohol with latex selected from class of styreneacrylic copolymers at ratio (20-25%):(7-18%) based on the weight of pigment. Cationic fixative is poly(diallyldimethylammonium chloride), which is directly incorporated into coating composition in amount 5-10%.

EFFECT: enabled image quality and paper surface strength control.

3 cl, 1 tbl, 13 ex

FIELD: pulp-and-paper industry.

SUBSTANCE: coating composition consisting of ink-compatible pigment, water-soluble binder, and cationic fixative is deposited onto one of the sides of based paper and the other side is covered with detwisting coating, after which glossy surface is formed. Coating composition is supplemented by wettability controlling agent based on polydimethylsiloxane resins in amounts 0.4 to 1.6% of the weight of pigment. Water-soluble binder is a mixture of polyvinyl alcohol with polyvinylpyrrolidone at ratio (90-50):(10-50) in amount 40-60% and styreneacrylic latex in amount 15-20% of the weight of pigment. When forming glossy surface, polyethylene oxide-based plasticizer is used in amount 7-15% of the weight of pigment followed by supercalendering at pressure in roll contact zone 20-25°C and temperature 50-90°C.

EFFECT: improved manufacturability of process.

5 cl, 1 tbl, 54 ex

FIELD: negative printing forms developed in printing machine, which may be exposed by ultraviolet, visible or infrared radiation.

SUBSTANCE: cover-forming composition is described, which includes (i) polymerization-capable compound and (ii) polymer binding agent, containing polyethylene-epoxide segments, where polymer binding agent is selected from group which consists of at least one added copolymer, containing polymer of the main chain and polyethylene-epoxide side chains, block copolymer, containing at least one polyethylene-epoxide block and least one non polyethylene-epoxide block, and combinations of these. Also described is an element, in which image may be formed, including base and polymerization-capable covering composition.

EFFECT: differentiation between image sections exposed and non-exposed by electromagnetic radiation, facilitating development of non-exposed sections in water developing agents, increased resistance to development of exposed sections, ensured coloration capacity of the latter when not heated before development.

5 cl, 3 dwg, 11 ex

FIELD: protective members for visual controlling of authenticity of printing product such as security papers, banknotes, identification cards.

SUBSTANCE: protective member is formed as color layer applied to substrate and having color-free portions produced by exposing color layer to laser radiation for forming of image detected by visual control. Substrate surface is provided with relief, said image being formed on at least one side of relief after exposing to laser radiation falling at predetermined angle to relief surface. Protected printing product is equipped with protective member for visual controlling of paper authenticity.

EFFECT: increased extent of protecting printing products due to creation of protective member more complicated for counterfeit and using optical variable image.

7 cl, 5 dwg

FIELD: print engineering.

SUBSTANCE: invention provides ink containing first fluorescent color material emitting fluorescence at specified emission wavelength used for measurement or determination of excitement at specified excitement wavelength; and second fluorescent color material emitting fluorescence when excited at specified excitement wavelength, said second color material being contained in larger amount than said first color material. To obtain fluorescence at desired emission wavelength, excitement spectrum of the first color material in ink should have peak wavelength range adjoining specified fluorescent wavelength, and emission fluorescence spectrum of the second color material has emission wavelength range that includes at least above-mentioned peak wavelength range.

EFFECT: enhanced fluorescence intensity due to presence of several fluorescent coloring substances.

9 cl, 26 dwg, 3 tbl, 6 ex

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