Using surface-treated calcium carbonate in tissue paper, method of obtaining tissue paper product having improved softness and obtained tissue paper products having improved softness

FIELD: chemistry.

SUBSTANCE: invention can be used in production of tissue paper. Surface-treated natural calcium carbonate is used as filler in tissue paper products, where said calcium carbonate is a product of reaction of natural calcium carbonate with an acid and carbon dioxide. The carbon dioxide is formed in situ by treatment with the acid and/or is fed from an external source. The surface-treated natural calcium carbonate is obtained as an aqueous suspension having pH higher than 6.0, measured at 20°C.

EFFECT: invention improves softness of tissue paper products such as facial tissue, toilet paper, ornamental paper, towels, napkins or tissue paper cloths.

47 cl, 1 dwg, 5 tbl, 3 ex

 

This invention relates to the use of exposed surface-treated natural calcium carbonate as filler in products of thin paper, the method of obtaining products of thin paper and the product of thin paper having improved softness.

The usual thin paper products are products of mass consumption and include cosmetic napkin, toilet paper, decorative paper and paper gift packaging, such as crepe paper, household and industrial sheets of thin paper, napkins of fine paper and tissue paper, such as tablecloths made of thin paper.

Thin paper mainly characterized and distinguished from the standard copy or print paper so that they can be compared with textile materials and they must meet specific high softness, easy deleting, low weight (density less than 65 g/m2or in some cases less than 40 g/m2or even less than or equal to 32 g/m2and in some cases the specific requirements of water resistance. They also differ in that often composed of many layers of thin paper, called "layers". Moreover, thin paper mainly manufactured using the method mentioned in the prior art as a way of paper production craioveanu the thin paper, despite the fact that there are other, less common methods of manufacture.

Toilet paper is mainly paper weight 14 to 22 g/m2and formed from one or several, for example four layers.

Cosmetic wipes often have a slightly lower density paper 14-18 g/m2and mainly consist of two to three layers.

Household sheets of thin paper, also known as kitchen towels, have a slightly higher paper weight 20 to 24 g/m2and rarely have more than two layers.

Single-layer industrial sheets of thin paper usually have a paper weight approximately 33-50 g/m2while their double-layer counterparts have a paper weight 22-24 g/m2.

Data thin paper may also differ among themselves in nature source of fiber (and especially the number of pulp and secondary fiber in them), and the presence of additional additives, such as moisture-resistant resin.

For all of these types of thin paper, but especially for cosmetic wipes, napkins made of thin paper, toilet paper and tissues of thin paper, the softness is one of the most important market characteristics.

The softness was determined mainly by the surface expression of softness and gentleness of the main mass and should be considered as a function of smoothness, PR is suemoto, stiffness and crispy properties". Traditionally, the degree of softness of tissue paper was evaluated using samples to the touch, but have recently become available methods of quantitative measurement.

For the purposes of this application the softness of tissue paper evaluated by applying the technology of the analyzer soft thin paper Emtec, as described below.

Prior art

Was offered a number of solutions to meet the needs of the increased softness of tissue paper.

The first class of solutions involves adding synthetic hygroscopic substances during the manufacture of thin paper. International application WO 96/25557, for example, describes the application of soluble polyhydroxyalkane on moist cloth thin paper before drying and craigrownie this canvas to form the final paper thin. U.S. patent 4764418 adds hygroscopic substances, such as polyethylene glycol to the dry cloth.

The second approach involves adding special oils and/or waxes to the thin paper, such as described in international applications WO 96/24723, WO 97/30216, WO 02/057547 and European patent 1029977. However, both of the above approaches can lead to the development of undesirable odor associated with the final product of thin paper, and are relatively expensive means of improving the softness of tissue paper.

The third approach requires the provision of special surfactants, possibly in combination with additional additives, as described, inter alia, in U.S. patent No. 4940513, 4351699 and 4441962.

The fourth approach is to provide a special chemical leavening agents, as described, inter alia, in U.S. patent No. 5217576, 5223096, 5240562, 5262007 and 5279767.

The supply of the chemical additives of the above two groups in the products of thin paper again represents a relatively expensive means of improving the softness of the product firebox paper.

Another approach includes the modification of certain aspects of the method of manufacturing a thin paper, for example, through additional steps in the method such as calendering after drying cloth furnace of paper and/or modification of the equipment used in the production of thin paper. In his search for superior softness specialist in this field also can make a special election regarding the nature and/or degree of cleaning of the fibers used to form the fabric of thin paper. However, all these approaches specialist this area will require a simple, cost-effective solution that can easily provide a wide range of manufacturing methods of thin paper, and using a wide range of additional substances, including standard and fiber.

Given the shortage, the key known solutions provide soft thin paper, mentioned above, the object of this invention is to provide a new solution to this problem.

The object set forth above, surprisingly was resolved by applying subjected to surface-treated natural calcium carbonate as filler in the product thin paper, with the exposed surface-treated natural calcium carbonate is a reaction product of natural calcium carbonate with an acid and carbon dioxide, which is formed in situ by treatment with acid and/or provide outside, and subjected to surface-treated natural calcium carbonate receive as aqueous suspension having a pH higher than 6,0, measured at 20°C.

As for the fillers based on calcium carbonate products for thin paper, the specialist of this area known international application WO 98/28491, which reveals that it is durable, soft, filled with thin paper with a low content of cotton fiber and dust can be obtained by forming filled with thin paper with modified surface characteristics. Although the preferred fillers include inorganic materials such as clay and calcium carbonate, the preferred embodiments of focusing exclusively on clay. Not provided any details regarding the nature to which rbonate calcium.

Related international application WO 97/17494 likewise relates to the requirements of the modified surface-binding properties of thin paper, which includes a filler in the form of particles, which may include calcium carbonate.

International application WO 97/37081 relates to a method for inclusions of small mecellose filler in the form of particles in the thin crepe paper, where this method is characterized by the fact that includes the following steps:

contacting the aqueous dispersion mecellose filler in the form of particles with the aqueous polymer dispersion of anionic polyelectrolyte,

mixing the water dispersion of the filler, prokontaktirovat with polymer fiber paper production with the formation water composition paper production, including filler, prokontaktirovat with polymer and fiber paper manufacturing,

(a) contacting a specified water composition paper production with cationic retention additive,

(b) the formation of immature paper web from an aqueous composition paper production on a perforated cloth paper production,

(c) removing water from the specified immature blade for forming a moist cloth paper production,

(d) prilepljeni moist cloth paper production to the Yankees-cilin the Roux and drying the specified panel to the substantially dry state,

(e) craigrownie substantially dry cloth from the Yankee cylinder by means of a flexible creping blade, thereby forming crepe gokuu paper.

Among other options, this acellularity filler in the form of particles may be calcium carbonate. In addition to describing the preferred filler which has an average equivalent spherical diameter of between 0.5 μm and 5 μm, no further information is available regarding the filler, or more specifically of calcium carbonate.

International application WO 98/13549 relates to a method of manufacturing crepidomanes, durable, soft and low dust cloth thin paper, including holding the filler. This method includes the following steps:

(a) providing a water suspension composition paper production, including fiber paper production and acellularity filler in the form of particles, with specified filler in the form of particles preferably comprise from approximately 1% to approximately 50% of the total weight of the specified thin paper filler in the form of particles selected from the group that includes, among many other options, calcium carbonate, although it is specified that kaolin clay is preferred;

(b) the premises specified aqueous suspension composition lumanog the production on the surface of the moving perforated forming fabric for the formation of immature wet cloth paper production;

(c) moving the specified immature wet cloth paper production from the forming fabric to the first net migration, moving at a speed of from about 5% to about 75% slower than the forming mesh; and

(d) moving the immature wet cloth paper production with the first grid transfer through at least one additional move on drying mesh, after which the specified immature wet cloth paper production incompressible dried.

U.S. patent 5672249 relates to such a method include small mecellose filler, based on the particles in the thin crepe paper, where, in particular, is starch, and where the specified filler in the form of particles comprises from approximately 1% to approximately 50% of the total weight of the specified creped tissue paper, with specified filler in the form of particles selected from a large group of variants filler comprising calcium carbonate. Again not provided any information regarding the nature of calcium carbonate.

International application WO 01/44571 provides a relatively soft, durable, opaque product of thin paper and method for its manufacture, including the inclusion of alkylamide or alkylamino softener together with fillers in the form of particles during the process of incompressible what about the formation of thin paper. The specified filler in the form of particles may, among other things, to be calcium carbonate. Again not provided any details regarding the calcium carbonate.

U.S. patent 2004/118534 reports creped composition, including the stitching, the polymer is capable of forming formaldehyde using the condensation reaction at the stitching, the material of the filler (which may be calcium carbonate) and water-soluble compound of a glycol. Among the characteristics of the products obtained firebox paper there is a feeling of softness. Again not provided any guidance on any predominant characteristics of calcium carbonate.

Finally, U.S. patent 6706148 discloses a method of attaching a mineral filler, which can be, among others, calcium carbonate, aqueous suspension of cellulose fibers, which can eventually form a thin paper. In this way the corresponding hydroxide mineral filler is added to the reaction medium, which includes cellulosic fibers, and the hydroxide is subsequently deposited on the fibers, thus forming mineral filler.

As you can see, the use of calcium carbonate as filler for thin paper, while sometimes referred to in the prior art, is always mentioned as among other filler is or other options, and b) without a single hint regarding the required properties of this calcium carbonate and especially not in relation to a specific surface treatment, so that the prior art generally does not provide instruction, guidance or proposal specialist this area in this respect.

The use of exposed surface-treated natural calcium carbonate according to the invention unexpectedly discovered, leads to the product thin paper superior softness compared to the thin paper products, including standard fillers calcium carbonate prior art. In addition, the solution according to this invention can be provided in a wide range of manufacturing methods of thin paper, and it provides superior softness without the need for additional supplements or special complex stages of a method of manufacturing a thin paper.

DETAILED description of the INVENTION

Exposed surface-treated natural calcium carbonate

Exposed surface-treated natural calcium carbonate used as a filler in products fine paper according to this invention, are obtained by reaction of natural calcium carbonate with an acid and carbon dioxide, where the carbon dioxide is formed in situ by treatment with acid and/or supplied from an external source.

Preferably natural to rbonate calcium choose from marble, chalk, calcite, dolomite, limestone or mixtures thereof. In a preferred embodiment, the natural calcium carbonate grind before treatment with acid and carbon dioxide. Stage grinding can be performed by any conventional grinding device (such as a mill), well-known specialist in this field.

Exposed surface-treated natural calcium carbonate, which should be used in this invention, receive as aqueous suspension having a pH, measured at 20°C, higher than 6,0, preferably higher than 6.5, more preferably higher than a 7.0, even more preferably higher than 7.5.

In the preferred method of obtaining aqueous suspension of natural calcium carbonate, or crushed (for example, by grinding), or no suspended in water. Preferably the suspension has a natural content of calcium carbonate in the range of from 1 wt.% up to 80 wt.%, more preferably from 3 wt.% up to 60 wt.% and even more preferably from 5 wt.% od 40 wt.% based on the weight of the suspension.

At the next stage (the first stage of processing) acid is added to the water suspension comprising natural calcium carbonate. Preferably, the acid has a pKaat 25°C. of 2.5 or less. If pKaat 25°C is equal to 0 or less, the acid is preferably selected from sulfuric acid, hydrochloric acid or mixtures thereof. If p aat 25°C equals 0-2,5, acid preferably selected from H2SO3, HSO4-H3PO4, oxalic acid or mixtures thereof. One or more acids can be added to the suspension as a concentrated solution or a more dilute solution. Preferably the molar ratio of the acid to the natural calcium carbonate is from 0.05 to 4, more preferably from 0.1 to 2.

As an alternative you can also add acid to water to suspension of natural calcium carbonate.

At the next stage (the second stage of processing) natural calcium carbonate is treated with carbon dioxide. If a strong acid such as sulfuric acid or hydrochloric acid used for the acid treatment of natural calcium carbonate, the system automatically generates carbon dioxide. Alternative or additionally, the carbon dioxide supplied from an external source.

Acid treatment and treatment with carbon dioxide can be performed simultaneously in the case when using a strong acid. It is also possible to first perform the acid treatment, for example, srednezerny acid having a pKa0-2,5, followed by treatment with carbon dioxide supplied from an external source.

Preferably, the concentration of gaseous carbon dioxide in suspension, surround you is hagenii, such that the ratio (volume of suspension):(volume of gaseous CO2) is from 1:0.05 to 1:20, even more preferably from 1:0.05 to 1:5.

In a preferred embodiment, the step of acid treatment and/or processing phase carbon dioxide is repeated at least once, preferably several times.

In a preferred embodiment, the acid treatment and/or processing of carbon dioxide takes place when the temperature of the suspension is higher than at least 60°C.

After acid treatment and treatment with carbon dioxide the pH of the aqueous suspension, measured at 20°C, naturally reaches values higher than 6,0, preferably higher than 6.5, more preferably higher than a 7.0, even more preferably higher than 7.5, thus getting exposed surface-treated natural calcium carbonate as an aqueous suspension having a pH higher than 6.0 and preferably higher than 6.5, more preferably higher than a 7.0, even more preferably higher than 7.5. If water suspension be allowed to reach equilibrium, the pH will be higher than 7. pH higher than 6,0 can be adjusted without adding the base, when mixing water suspension continues for quite a long period of time, preferably from 1 hour to 10 hours, preferably 1-5 hours.

Alternatively, to achieve the SOS the sustainability of equilibrium, which occurs at a pH higher than 7, the pH of the aqueous slurry can be increased to values greater than 6, by adding a base after treatment with carbon dioxide. You can apply any conventional base such as sodium hydroxide or potassium hydroxide.

Using the steps of the method described above, i.e. the acid treatment, treatment with carbon dioxide and pH adjustment, get exposed surface-treated natural calcium carbonate, which gives softness while providing in tissue paper.

Further details about obtaining exposed surface-treated natural calcium carbonate are disclosed in international application WO 00/39222 and U.S. patent 2004/0020410 A1, the contents of these references are hereby included in this application. According to the documents subjected to surface-treated natural calcium carbonate used as a filler, which increases the volume, for the manufacture of paper.

In a preferred embodiment, receiving the exposed surface-treated natural calcium carbonate, natural calcium carbonate reacts with acid and/or carbon dioxide in the presence of at least one compound selected from the group comprising silicate, silicon dioxide, aluminum hydroxide, alkali earth metal aluminate, such as sodium or the Aliya aluminate, magnesium oxide or mixtures thereof. Preferably, at least one silicate selected from aluminum silicate, calcium silicate or silicate alkaline earth metal. These components can be added to the water suspension comprising natural calcium carbonate, before adding acid and/or carbon dioxide. Alternatively, the component(s) of silicate and/or silicon dioxide and/or aluminum hydroxide and/or alkali earth metal aluminate, and/or magnesium oxide can be added to the aqueous suspension of natural calcium carbonate, although the natural reaction of calcium carbonate with an acid and carbon dioxide has already begun. Further details about obtaining exposed surface-treated natural calcium carbonate in the presence of at least one component(components) of silicate and/or silicon dioxide and/or aluminum hydroxide and/or alkali earth metal aluminate are disclosed in international application WO 2004/083316, the contents of this reference are hereby included in this application.

In another preferred embodiment, receiving the exposed surface-treated natural calcium carbonate, natural calcium carbonate reacts with acid and/or carbon dioxide and processed before and/or during and/or after the reaction of the acid and/or carbon dioxide, is connected to the eat or compounds of the formula R-X, where the radical R represents a carbon radical, saturated or not, having 8-24 carbon atoms, such as linear or branched alkyl, alkylaryl, arylalkyl, aryl, polyaryl or cyclic group, or combinations thereof, and where X represents groups such as carboxyl, amine, hydroxyl, phosphine, or combination thereof. Specifically, R-X may be selected from among fatty acids, fatty amines or fatty alcohols, or saturated or not, having preferably 8-24 carbon atoms, such as, in particular, stearic, oleic, linoleic, myristic, Caprylic types or their combinations, and very preferably 16-18 carbon atoms, or combinations thereof, with synthetic or natural fatty compounds, preferably compounds of plant origin, such as coconut oil, or animal origin, such as fat, and very preferably of plant origin. The water-repellent processing means may in some cases be pre-emptive in that it may allow selective absorption of thin paper such, for example, thin paper provides for the absorption of oil instead of water in contact with a mixture of these liquids.

Exposed surface-treated natural calcium carbonate can be stored in suspension, the faculty is ative additionally stable dispersing agent. You can apply the usual dispersing agents, well-known specialist in this field. Dispersing agent may be anionic or cationic.

Alternatively, the aqueous suspension described above, can be dried, thereby obtaining exposed surface-treated natural calcium carbonate in the form of granules or powder.

In a preferred embodiment, exposed surface-treated natural calcium carbonate has a specific surface area of 5 m2/g to 200 m2/g, more preferably from 20 m2/g to 80 m2/g and even more preferably from 30 m2/g to 60 m2/g, measured using nitrogen and the BET method (brunauer-Emmett-teller) according to ISO 9277.

In addition, it is preferable that the exposed surface-treated natural calcium carbonate had a weight median grain diameter of 0.1-50 μm, more preferably 0.5 to 25 μm, even more preferably 0.7 to 7 μm, measured according to the method of deposition. Measurement of the weight median grain diameter was performed on the device Sedigraph™ 5120, as described in further detail in the experimental part below.

In a preferred embodiment, exposed surface-treated natural calcium carbonate has a specific surface area within the range of 15-200 m2/g and the weights of the th median grain diameter within the range of 0.1-50 μm. More preferably, the specific surface area is within the range of 20-80 m2/g, and the weight median grain diameter is within the range of 0.5-25 μm. Even more preferably, the specific surface area is within the range of 30-60 m2/g and a weight median grain diameter is within the range of 0.7 to 7 μm.

In a preferred embodiment, exposed surface-treated natural calcium carbonate has a brightness 75-97% ISO brightness, as measured according to methods well described in the examples below.

In a preferred embodiment, exposed surface-treated natural calcium carbonate has an abrasion of less than 3 mg, preferably less than or equal to 2 mg and more preferably less than or equal to 1 mg, as measured according to the method described in the Examples below.

The way in which have been subjected to surface treatment of natural calcium carbonate

In the production method of thin paper according to this invention is subjected to surface-treated natural calcium carbonate is introduced into the thin paper during production method of thin paper by any conventional means known to the specialist in this field, or by using any new tools that will be R is developed in the future in the field of engineering, with the aim of forming thin paper.

Exposed surface-treated natural calcium carbonate can be added during the production method of thin paper as an aqueous suspension, for example, the suspension described above, which is subjected or not to the further dissolution or partial increase in concentration. Alternative it can be added during the production method of thin paper in any suitable solid form, for example in the form of powder or in the form of a cake. Within the context of the present invention may also provide stationary phase, for example, in the form of a cake or layers, including the exposed surface-treated natural calcium carbonate.

In one embodiment, exposed surface-treated natural calcium carbonate is added in the course of the production method of thin paper in addition to other mineral fillers, such as one or more of calcium carbonate such as ground natural calcium carbonate on the basis of limestone, marble, chalk and/or dolomite and/or precipitated calcium carbonate, talc, titanium dioxide and kaolin clay.

Adding subjected to surface-treated natural calcium carbonate in the form of suspension (or suspension) with or without other additional mineral fillers specified with spense preferably has a total solids content of mineral filler 1-80% solids, as measured according to the method described in the Examples below.

Adding subjected to surface-treated natural calcium carbonate in the form of suspension (or suspension) with or without other additional mineral fillers specified suspension preferably has a viscosity 1-3000 MPa*s, preferably 1 to 1,000 MPa*s and more preferably 1-500 MPa*s, as measured according to the method described in the Examples below.

In the overall production of thin paper cloth paper thin first formed by dewatering the suspension of fibres manufacture of thin paper (possibly including other additives, this General suspension is called "composition"), added to the mechanism of production of thin paper through the headbox, on a perforated surface, such as wire mesh. Fiber paper production, the most frequently used in tissue paper, are pure wood pulp, however, also used paper pulp waste paper (also called "paper weight") and impurities with a wood lot. Provided largely bleached sulphite and sulphate pulp. These fibers production of thin paper can in some cases be previously subjected to various degrees of purification to separate the fibers of this desired onine.

In one embodiment of the present invention subjected to the surface-treated natural calcium carbonate is added to and mixed with a suspension of fibres manufacture of thin paper (and possibly additional conventional additives) to form a composition prior to the introduction into the mechanism of production of thin paper and significantly to dehydration.

In another embodiment, the present invention numerous overlapping layers of the composition is added to a perforated surface for forming layered canvas paper thin. These layers can have a different structure, but, at least, one of them includes the exposed surface-treated natural calcium carbonate according to the invention.

Dehydration of the paintings of thin paper and then basically continues for the formation of moist cloth thin paper, for example, in the press section by mechanically compressing the fabric of thin paper or by using pass-through drying of leaf tissue paper hot air when passing, for example, through one or more perforated portable mesh or skolachivaniya. In one embodiment, a method of manufacturing a thin paper according to this invention provides such a stage of mechanical pressure or through-drying fabric is oncol paper, or perform any of the traditional methods of dehydration of the cloth of thin paper, which is well-known specialist in this field. It should be noted that any or all stages of dehydration can make further use of vacuum or other tools known to remove water from a cloth of tissue paper.

Finally, this moist cloth thin paper additionally dried or fully for the formation of thin paper, for example, by placing it on the surface of the Yankee cylinder. Yankee cylinder is a large, mainly steel cylinder, where steam injection is used to provide a hot surface on which, ultimately, dried leaf tissue paper. In one embodiment, a method of manufacturing a thin paper according to this invention carries out this step-keeping the blade of thin paper on the surface of the Yankee cylinder or perform any conventional means known to the specialist in this area for additional or full drying of leaf tissue paper to form a thin paper, as, for example, with the use of the burner with the air bag or by using pass-through drying.

Common practice is krepelova thin paper or moist cloth thin paper, although crepidomanes thin paper also exist. Repasovane which includes mechanical compression of thin paper in the machine direction and is largely done through the use of elastic blades, or "blade scraper", in contrast to the Yankee cylinder. Craigrownie can be performed on dry or wet thin paper or canvas paper thin. In one embodiment, a method of manufacturing a thin paper according to this invention can carry out this stage of craigrownie wet or dry thin paper or cloth thin paper, for example, by using an elastic blade or blade scraper", compared to a Yankee cylinder, or by any conventional means known to the specialist in this field, for craigrownie thin paper.

A small number of functional chemicals, such as water-resistant or durable in dry condition resins, hygroscopic substances, oils, waxes, retaining additives, bactericides, surfactants, oil, leavening agents, softeners, composition, facilitating craigrownie, starches and various polyelectrolyte polymers are often added during the production method of thin paper, or formed of thin paper, although typically only in small quantities. In one embodiment, a method of manufacturing a thin paper according to this invention can perform the addition of one or more of the above functional chemicals. The choice of the nature and quantities of such tools so that they were with mistime with a composition or a thin piece of paper and with each other, and their implementation in the production method of thin paper well-known specialist in this field.

After forming the thin paper (layer) then you can cut and layering for forming a thin paper having multiple layers. In one embodiment, a method of manufacturing a thin paper according to this invention carries out one or more of the steps of cutting thin paper. The method according to this invention may also include one or more of the steps of layering two or more layers of thin paper for forming thin paper, where at least one layer is formed according to the method of manufacturing the thin paper of the present invention.

Method of manufacturing thin paper may additionally include the steps of calendering and/or coating, and/or embossing (the padding and/or waviness), and/or impregnation liquid, such as lotion, and/or printing on thin paper, with the aim of forming a thin paper. In one embodiment, a method of manufacturing a thin paper according to this invention may implement one or more of these additional steps.

The resulting product is a thin paper

Product thin paper of the present invention is one obtained by the production method of thin paper, as described above.

The product t is ncoi paper of the present invention alternative is characterized by it includes exposed surface-treated natural calcium carbonate obtained by the reaction of natural calcium carbonate with an acid and carbon dioxide, where the carbon dioxide is formed in situ by treatment with acid and/or supplied from an external source.

In a preferred embodiment, the product thin paper of the present invention substantially contains 2-20% by weight of exposed surface-treated natural calcium carbonate relative to the total weight of the product is paper thin. More preferably contains 3-15% by weight of exposed surface-treated natural calcium carbonate relative to the total weight of the product is paper thin.

In the presence of additional mineral fillers in the product thin paper in addition to the exposed surface-treated natural calcium carbonate, the total content of mineral filler paper is preferably 1-50% by weight, more preferably 1-25% by weight and most preferably 1-15% by weight relative to the weight of the product is paper thin.

In a preferred embodiment, the product thin paper according to this invention has a density of paper on the layer 5-50 g/m2as measured according to the method described in Examples below. In another preferably the m of the embodiment, the product thin paper contains from 1 to 3 layers of thin paper, although specialist in this area will take into account that the choice of the number of layers forming the product of thin paper, will depend on the end use of this product is paper thin.

In a preferred embodiment, the product thin paper according to this invention has a softness of less than 6,0 TSA, preferably less than 5.5 TSA and more preferably less than 3.5 TSA, as measured according to the method described in the Examples below.

Alternatively, in another preferred embodiment, at equivalent loading of the filler in a thin paper other equivalent compositions, the product is thin paper according to this invention has a softness, as measured according to the method described in the Examples below, which, at least 2 standard deviations less than the TSA value equivalent to the product of thin paper, where exposed surface-treated natural calcium carbonate is replaced by the standard calcium carbonate, which has a weight median diameter, as measured according to the method described in the Examples below, within 10% of the weight median diameter of the exposed surface-treated natural calcium carbonate as measured according to the method described in the Examples below, and where the density of the product thin paper, including the conventional calcium carbonate, as measured according to the method described in the Examples below, is within 5% product density thin paper, including the exposed surface-treated natural calcium carbonate.

Alternatively, in another preferred embodiment, the product thin paper according to this invention has a softness, as measured according to the method described in the Examples below, which, at least 2 standard deviations less than the TSA value equivalent to the product of thin paper, which does not contain any filler, and where the density of the product thin paper, not containing the filler, as measured according to the method described in the Examples below, is within 5% product density thin paper, including the exposed surface-treated natural calcium carbonate.

Finally, the product is thin paper according to this invention is preferably a cosmetic towel, toilet paper, decorative paper and/or paper gift packaging, household and/or industrial sheets of thin paper, napkins of the furnace tissue paper or thin paper.

EXAMPLES

Methods of measurement

The following measurement methods used to estimate the parameters shown in the following examples and formula invented the I.

Regarding mineral filler in the form of mist:

The solids content

The solids content of the suspension (also known as "dry weight") is determined using the moisture analyzer HR73 production Mettler-Toledo with the following parameters: temperature 120°C, auto-off 3, standard drying, 5-20 g of sediment.

Viscosity

The measured viscosity is a viscosity Brookfield measured with the use of the device Brookfield RVTDV-II at 100 rpm (revolutions per minute), and the selected spindle so that % the efficiency of transferring torque from the spindle to the liquid is in the range 20-80.

pH

the pH of the aqueous suspension is measured using a standard pH meter at approximately 22°C.

Specific surface area

The specific surface area measured by BET method according to ISO 9277 using nitrogen, maintaining the conditions for the sample heated at 250°C for a period of 30 minutes.

The grain size distribution (wt.% particles with a diameter < X) and the weight median grain diameter (d50)

The weight median grain diameter and mass distribution of the grain diameter was determined by the method of deposition, i.e. the analysis of the behaviour of sediment in a gravimetric field. The measurement is carried out on the Sedigraph™ 5120.

Method and device known to the specialist in the Anna area and are widely used to determine the grain size of the fillers and dyes. The measurement is carried out in an aqueous solution of 0.1 wt.% Na4P2O7. Samples were dispersively using high-speed stirrers and ultrasound.

ISO brightness R-457

R-457 ISO brightness determined according to ISO 2469 using Elrepho instrument 3300.

Abrasion

Abrasion was measured with the use of the device AT 2000 (A type 871001 Nr. 8602 (prototype), With serial number 9560-9501) company Einlehner using RK 2069 test bodies and 1 kg of the reference suspension EMH-20 powder having a solids content of 0.7 to 0.9% by weight, calibrated so that the standard provides the amount of abrasion of 15.5-17.5 mg

On paper handmade character, including mineral filler:

Paper weights

The density of a sheet of paper with a handmade character determined according to DIN EN ISO 536, maintaining the conditions for a sheet of paper manually reflux for 48 hours in an environment with 50% relative humidity and a temperature of 23 +/- 1°C.

Thickness

The thickness of a sheet of paper with a handmade character determined according to SN EN ISO 534, maintaining the conditions for a sheet of paper manually reflux for 48 hours in an environment with 50% relative humidity and a temperature of 23 +/- 1°C, and with the use of a micrometer with a test pressure of 10 N/cm2.

The softness

The softness of the sheet of paper with a handmade character without the use of any of the terms evaluated using the app is RA analyzer soft thin paper (room equipment 01-01-26) company Emtec (Paper Testing technology testing paper)).

Bulk

The bulk of the paper manual low tide, depending on volume, which is grams of a sheet of paper with a handmade character, determined by dividing the thickness of a sheet of paper with a handmade character on the mass per unit planar area of the sheet of paper with a handmade character, using the appropriate units.

Example 1: Obtaining suspensions of mineral fillers

Test 1:

This test illustrates the obtaining of aqueous suspensions of natural calcium carbonate prior art, called suspension of A.

For this test suspension is milled marble manufactured by the company OMYA under the trade name Hydrocarb 60 IU-78%, bred for forming 65% of the suspended solids.

Received a suspension of natural calcium carbonate, called A suspension, has the characteristics presented in table 1.

Table 1.
TestsUnitSuspension A
The solids content%65
ViscosityMPa*s250
pH8,5

Natural calcium carbonate in aqueous suspensions And has the characteristics presented in table 2.

Table 2.
TestsUnitSuspension A
Specific surface aream2/g6,8
Sedigraph™ 5120
<2 μmwt.%61
<1 μmwt.%37
The weight median particle diametermicrons at 50 wt.%
less than
1,5
Abrasionmg17-18

Test 2:

This test illustrates the obtaining of aqueous suspensions subjected to surface-treated natural calcium carbonate, called suspension Century.

Finely powdered natural sodium carbonate, originating from Austria, suspended to obtain a suspension of approximately 65% by weight of dry ve is esta. The suspension thus formed, is then treated by slow addition of phosphoric acid at a temperature of approximately 60°C, sufficient to provide a product having a specific surface area according to BET of 80 m2/g and a weight median diameter of 1.5 μm.

The obtained suspension is subjected to surface-treated natural calcium carbonate has the characteristics presented in table 3.

Table 3.
TestsUnitSuspension B
The solids content%10,6
ViscosityMPa*s121
pH7,2

Exposed surface-treated natural calcium carbonate in aqueous suspensions has the characteristics presented in table 4.

Table 4.
TestsUnitSuspension B
m2/g80
Sedigraph™ 5120
<2 μm%91,0
<1 μm%6,3
The weight median particle diametermicrons at 50 wt.%
less than
1,52
ISO brightness%94,0
Abrasionmg0,7

Figure 1 shows SEM (scanning electron microscopy) image of this exposed surface-treated natural calcium carbonate.

Example 2: Receiving sheets of thin paper manual low tide

Sheets of paper with a handmade character, having a paper weight of 20-30 g/m2received, providing a suspension of mineral filler tests 1 and 2. Sheets of paper with a handmade character got so that they had a load of dry mineral filler 3, 6 and 10% by weight on the total weight of the sheet of paper with a handmade character. The composition of the fibers used for the formation of the deposits of sheets of paper handmade character, consists of fibres 100% bleached sulfite with 17°SR. Sheets of paper with a handmade character received with use of sheet machine Rapid-Köthen.

Example 3: Analysis of the paper manual low tide

Sheets of paper with a handmade character formed in Example 2 is then analyzed according to the methods of measurement described above. The results are presented in table 5.

Table 5.
Only weightWeight + suspensionWeight + suspension B
Weight CaCO3on the total weight of the sheet of paper with a handmade character (%)036103610
Dimension sheet of paper with a handmade character
Paper weight (g/m2)30,930,931,729,931,731,631,1
Thickness (µm) 65,265,265,465,370,0to 70.270,6
Softness (TSA)to 7.77n/a*6,465,905,954.09 to3,15
Bulk (cm3/g)2,13of 2.212,222,15of 2.212,252,35
Brightness R-457+UV (%)72,874,776,478,074,874,7to 78.3
* n/a = data not available

Sheets of paper with a handmade character, formed with providing subjected to surface-treated calcium carbonate according to this invention, have a significant improvement in softness with equal loading of filler relative to the sheets of paper is handmade character, formed by providing a standard calcium carbonate.

1. The use of exposed surface-treated natural calcium carbonate as filler in products fine paper, where specified subjected to surface-treated natural calcium carbonate is a reaction product of natural calcium carbonate with an acid and carbon dioxide, which is formed in situ by treatment with acid and/or supplied externally, and subjected to surface-treated natural calcium carbonate receive as aqueous suspension having a pH above 6.0, measured at 20°C.

2. The use according to claim 1, characterized in that the exposed surface-treated natural calcium carbonate receive as aqueous suspension having a pH higher than 6.5, preferably above 7.0 and more preferably of 7.5, measured at 20°C.

3. The use according to claim 1 or 2, wherein the natural calcium carbonate selected from marble, calcite, chalk, dolomite, limestone or mixtures thereof.

4. The use according to claim 1, wherein the natural calcium carbonate is suspended in water so as to form a suspension having a solids content of natural calcium carbonate within the range 1 ÷ 80 wt.%, more preferably 3 ÷ 60 wt.%, and even more preferably 5 ÷ 40 wt.% based on the weight of the suspension.

5. Skin is tion according to claim 1, characterized in that the acid has a pKaat 25°C. of 2.5 or less.

6. The use according to claim 5, characterized in that the acid has a pKaat 25°C 0 or less.

7. The use according to claim 6, characterized in that the acid is a sulfuric acid, hydrochloric acid or mixtures thereof.

8. The use according to claim 5, characterized in. the acid has a pKaat 25°C 0 ÷ 2,5.

9. The use of claim 8, wherein the acid is an H2SO3, HSO4-N3RHO4, oxalic acid or mixtures thereof.

10. The use according to claim 9, where the molar ratio of the acid to the natural calcium carbonate is 0.05 ÷ 4, more preferably of 0.1 ÷ 2.

11. The use according to claim 1, wherein the natural calcium carbonate reacts with acid and/or carbon dioxide in the presence of at least one compound selected from the group comprising silicate, silicon dioxide, aluminum hydroxide, alkali earth metal aluminate, magnesium oxide or mixtures thereof.

12. The application of claim 11, wherein the at least one silicate selected from aluminum silicate, calcium silicate or silicate alkaline earth metal.

13. The use according to claim 1, characterized in that the exposed surface-treated natural calcium carbonate treated before and/or during and/or after the reaction with the acid is/or carbon dioxide, the compound or compounds of the formula R-X, where the radical R represents a carbon radical, saturated or not, having 8 to 24 carbon atoms, such as linear or branched alkyl, alkylaryl, arylalkyl, aryl, polyaryl or cyclic group, or combination thereof, and where X represents groups such as carboxyl, amine, hydroxyl, phosphine, or combination thereof.

14. The application of item 13, wherein R X is selected from fatty acids, fatty amines or fatty alcohols, saturated or not, having preferably 8-24 carbon atoms, such as, preferably, stearic, oleic, linoleic, miristinovoi, Caprylic types or their combinations, and very preferably 16-18 carbon atoms, or combinations thereof, with synthetic or natural fatty compounds, preferably compounds of plant origin, such as coconut oil, or animal origin, such as fat, and very preferably of plant origin.

15. The use according to claim 1, characterized in that the exposed surface-treated natural calcium carbonate has a specific surface area of 5 ÷ 200 m2/g, more preferably 20 ÷ 80 m2/g and even more preferably 30 ÷ 60 m2/year

16. The use according to claim 1, characterized in that the exposed surface of the processing of natural calcium carbonate has a weight median grain diameter of 0.1 ÷ 50 µm, more preferably 0,5 ÷ 25 μm, and even more preferably of 0.7 ÷ 7 microns.

17. The use according to claim 1, characterized in that the exposed surface-treated natural calcium carbonate stable dispersing agent.

18. The application 17, characterized in that the dispersing agent is a cationic or anionic.

19. The use according to claim 1, characterized in that the concentration of gaseous carbon dioxide in the suspension is in volume terms such amount that the ratio of the volume of suspension:volume of gaseous CO2is 1:0,05 ÷ 1:20, even more preferably 1:0,05 ÷ 1:5.

20. The use according to claim 1, characterized in that the acid treatment and/or processing carbon dioxide is repeated at least once and preferably several times.

21. The use according to claim 1, characterized in that the acid treatment and/or processing of carbon dioxide takes place at a temperature suspended above at least 60°C.

22. The use according to claim 1, characterized in that the exposed surface-treated natural calcium carbonate has a brightness of 75 ÷ 97% ISO brightness.

23. The use according to claim 1, characterized in that the exposed surface-treated natural calcium carbonate has an abrasion of less than 3 mg, preferably less than or equal to 2 mg, and more preferably less than or equal to 1 mg

24. Methods for the production of thin paper, wherein the exposed surface-treated natural calcium carbonate is injected during the production method of thin paper, with the aim of forming a thin paper, where specified subjected to surface-treated natural calcium carbonate is a reaction product of natural calcium carbonate with an acid and carbon dioxide, which is formed in situ by treatment with acid and/or supplied externally, and subjected to surface-treated natural calcium carbonate receive as aqueous suspension having a pH above 6.0, measured at 20°C.

25. Method of manufacturing thin paper according to paragraph 24, wherein the exposed surface-treated natural calcium carbonate is added in the form of a suspension of mineral filler.

26. Method for the production of thin paper at paragraph 24 or 25, where in addition to subjected to surface treatment of calcium carbonate add other mineral fillers during production method of thin paper, with the aim of forming thin paper.

27. Method for the production of thin paper on A.25, characterized in that the suspension preferably has a total solids content of mineral filler 1-80 % solids.

28. Method for the production of thin paper on A.25, wherein is shown the suspension has a viscosity 1-3000 MPa·s, preferably 1-1000 MPa·s and more preferably 1-500 MPa·S.

29. Method for the production of thin paper on A.25, characterized in that it includes at least one step of dewatering the suspension of a fibrous composition, the production of thin paper, added to the mechanism of production of thin paper through the headbox on the perforated surface.

30. Method for the production of thin paper on clause 29, wherein the exposed surface-treated natural calcium carbonate is added and mixed with a suspension of fibres manufacture of thin paper for the formation of composition before making mechanism in the production of thin paper and significantly to dehydration.

31. Method for the production of thin paper on clause 29 or 30, characterized in that the multiple overlapping layers of the composition add on perforated surface for forming layered canvas paper thin.

32. Method of manufacturing thin paper paragraph 24 or 25, characterized in that the dehydration on the perforated surface is carried out with subsequent dehydration to the press section by mechanically compressing the fabric of thin paper or by using pass-through drying of leaf tissue paper hot air.

33. Method of manufacturing thin paper paragraph 24 or 25, characterized in that the material of the thin paper is dried for fo the formation of the thin paper.

34. Method for the production of thin paper on p, characterized in that the material of the thin paper is dried by placing it on the surface of the Yankee cylinder.

35. Method of manufacturing thin paper paragraph 24 or 25, characterized in that the thin crepe paper.

36. Method for the production of thin paper at paragraph 24 or 25, characterized in that the functional chemicals added during the production method of thin paper or formed thin paper.

37. Method for the production of thin paper at paragraph 24 or 25, characterized in that the production method of thin paper includes the steps of calendering, and/or coating, and/or embossing and/or impregnation liquid thin paper with the purpose of forming thin paper.

38. The product is thin paper, characterized in that it is produced using the production method of thin paper, as stated above.

39. Product thin paper in § 38, characterized in that it includes an exposed surface-treated natural calcium carbonate obtained by the reaction of natural calcium carbonate with an acid and carbon dioxide, where the carbon dioxide is formed in situ by treatment with acid and/or supplied from an external source.

40. Product thin paper in § 38 or 39, characterized in that it comprises 2-20% by weight, preferably 3-15% by weight, the exposed surface is restoy the processing of natural calcium carbonate relative to the total weight of the product is paper thin.

41. Product thin paper in § 38 or 39, characterized in that the total content of mineral filler paper is preferably 1-50% by weight, more preferably 1-25% by weight and most preferably 1-15% by weight relative to the weight of the product is paper thin.

42. Product thin paper in § 38 or 39, characterized in that the density of a layer of thin paper is 5-50 g/m2.

43. Product thin paper in § 38 or 39, characterized in that it contains from 1 to 3 layers of tissue paper.

44. Product thin paper in § 38 or 39, characterized in that it has a softness of less than 6,0 TSA, preferably less than 5.5 TSA and more preferably less than 3.5 TSA.

45. Product thin paper in § 38 or 39, characterized in that it has a softness, which, at least 2 standard deviations less than the TSA is equivalent to the product of thin paper, where exposed surface-treated natural calcium carbonate is replaced by the standard calcium carbonate having an average diameter within 10% of the average diameter of the exposed surface-treated natural calcium carbonate, and where the density of the product thin paper, including the standard calcium carbonate is within 5% product density thin paper, including the exposed surface-treated natural calcium carbonate.

46. Product thin paper in § 38 or 39, characterized in that it has a softness, which, at least 2 standard deviations less than the TSA value equivalent to the product of thin paper, which contains no filler, and where the density of the product thin paper, not including the filler, is within 5% product density thin paper, including the exposed surface-treated natural calcium carbonate.

47. Product thin paper in § 38 or 39, characterized in that it is a cosmetic napkin, toilet paper, decorative paper and/or paper gift packaging, household and/or industrial sheets of thin paper, napkins of thin tissue paper or thin paper.



 

Same patents:

FIELD: process engineering.

SUBSTANCE: invention relates to production of sheet material composed of, at least, two superimposed fibrous layers. Proposed method comprises the following steps. First paper layer is made with, at least, one elongated zero-thickness zone by filtering water suspension at first drum screen. Second paper layer is made at second drum screen to make, at least, one recess in second layer. At least, one transparent element is arranged between two still wet layers to bind both layers so that said recess of second layer, one said transparent element and said elongated zero-thickness zone of first layer are opposed. Made structure is dried.

EFFECT: sheet material with protective element without structure peeling.

43 cl, 6 dwg

FIELD: process engineering.

SUBSTANCE: invention relates to production of sheet material composed of, at least, two superimposed fibrous layers. Proposed method comprises the following steps. First paper layer is made with, at least, one elongated zero-thickness zone by filtering water suspension at first drum screen. Second paper layer is made at second drum screen to make, at least, one recess in second layer. At least, one transparent element is arranged between two still wet layers to bind both layers so that said recess of second layer, one said transparent element and said elongated zero-thickness zone of first layer are opposed. Made structure is dried.

EFFECT: sheet material with protective element without structure peeling.

43 cl, 6 dwg

FIELD: chemistry.

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EFFECT: method of making a sheet article, improved process of creping fabric, introduction of useful additives in amounts sufficient for improving quality of sheets.

17 cl, 3 ex, 21 dwg

FIELD: textiles, paper.

SUBSTANCE: multilayer thin paper consists of at least two layers. At that the first layer includes a first embossing which forms linings. Moreover, each lining is formed in the shape of at least a part of the first motif. The second layer includes the second embossing which forms protrusions. And each protrusion forms at least a part of the second motif. Moreover, at least the first layer and the second layer are combined together so that the protrusions of the second layer are essentially located inside the linings of the first layer, and the motives are aligned with each other. At that the first motif and second motif are combined with each other to produce a repeating pattern of composite motifs consisting of the first and the second motifs. The group of inventions also relates to device transforming the paper and to a process for producing a multilayer thin paper.

EFFECT: group of inventions provides creation of a paper, which has clearly seen two different sides, and which has improved the tactile and optical characteristics.

26 cl, 19 dwg

FIELD: textiles, paper.

SUBSTANCE: whiteness of paper products of natural colour is 35-60% ISO, and for their production unbleached straw cellulose is used with a tensile strength of 230-280 mN, fracture strength with multiple bends of 40-90 times and permanganate index of 16-28. The composition of natural-coloured paper products includes sanitary and hygienic natural-coloured paper, paper towel of natural colour, paper for wipe of natural colour, paper for photocopies of natural colour, paper box for food of natural colour, natural-coloured wrapping paper for food products, and printing paper of natural colour.

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24 cl, 20 ex

FIELD: textiles, paper.

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24 cl, 20 ex

FIELD: textiles, paper.

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3 cl, 1 tbl, 3 ex

FIELD: paper industry.

SUBSTANCE: one side of paper-based substrate is coated with the first dyeing composition to provide the degree of whiteness L* with the value of L1. The second dyeing composition is applied to the opposite side of the substrate having the degree of whiteness L* with the value of L2. A colored product is obtained, characterised by the degree of whiteness L* with a value of L3 for the first coated side. The second coated side of the product has a degree of whiteness L* with a value of L4. Thus L1 is not more than 8 points higher than L3, and L2 is at least 30 points higher than L4. The degree of whiteness L* is determined using the colour characteristics CIE L* a* b*, a clarifier D 65, and at the observation angle of 10°C. In this method, the penetration of dyeing substances of the dyeing composition is adjusted so that the minimal impact is achieved on the degree of whiteness of the coating of white or light colour on the opposite side of coloured paper.

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15 cl, 1 dwg, 2 tbl

FIELD: textile, paper.

SUBSTANCE: article is perceived as dry to the touch and contains a foaming surfactant substance, in the form suitable to make soap foam in case of contact with water. The article is produced by application of a water solution of a foaming surfactant or a water composition comprising a foaming surfactant at one or more layers of a dry cloth of thin paper. The foaming surfactant is present in amount from 0.01 g/m2 to 6.00 g/m2. If a water composition is applied, then total amount of nonvolatile components of the specified composition does not exceed 20 wt % of dry mass of the specified one or more layers of thin paper. The method to clean hard surface consists in moistening of an article of thin paper with water and rubbing the hard surface.

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32 cl, 3 dwg, 1 tbl, 4 ex

FIELD: textile, paper.

SUBSTANCE: article is made with at least partial use of short-fibre cellulose. To form at least two fractions of fibrous material comprising fibres having various composition, short-fibre mass is sifted through a sieve. Besides, fine fibres are separated from cellulose, which pass through the sieve with holes of diameter of 0.2-1.5 mm and which are caught and included into composition of various layers of the fibrous article.

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19 cl, 10 dwg, 1 ex

FIELD: chemistry.

SUBSTANCE: titanium dioxide based pigment, containing titanium dioxide particles, has a coating layer containing aluminium phosphate and aluminium oxide, and said layer additionally contains hollow particles. To obtain said pigment, aqueous suspension of titanium dioxide is prepared first, and aluminium- and phosphorus-containing components are then added, after which hollow particles are added and pH of the suspension is brought to 4-9. Also, aqueous suspension of titanium dioxide can be obtained at pH not lower than 10, and aluminium- and phosphorus-containing components can then be added while maintaining pH of at least 10, after which hollow particles are added. Further, pH of the suspension is brought to 4-9 and an aluminium oxide coating is then applied at pH from 4 to 9.

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22 cl, 1 dwg, 1 tbl, 1 ex

FIELD: chemistry.

SUBSTANCE: invention can be used in chemical industry. The method of producing jointly ground calcium carbonate material, which contains ground calcium carbonate (GCC) and precipitated calcium carbonate (PCC) with coefficient of curvature at least equal to approximately 30, preferably at least approximately 40 and even more preferably at least approximately 45, comprises the following steps: a) obtaining at least one calcium carbonate material, optionally, in form of an aqueous suspension; b) combined grinding of GCC and PCC, optionally, with at least another mineral material which is selected from talc, clay, Al2O3, TiO2 or mixtures thereof; c) optional sieving and/or concentration of the jointly ground calcium carbonate obtained after step (b); d) optional drying of the jointly ground calcium carbonate material obtained after step (b) or (c). The coefficient of curvature is defined as d30/d70×100, where d30 and d70 denote equivalent spherical diameters, relative which 30 wt % and 70 wt % particles have a smaller size.

EFFECT: invention enables to improve optical properties of enamel paper and exclude the PCC deagglomeration step.

40 cl, 2 tbl, 4 ex

FIELD: chemistry.

SUBSTANCE: invention can be used in chemical industry. The method of producing jointly ground calcium carbonate material, which contains ground calcium carbonate (GCC) material and precipitated calcium carbonate (PCC) comprises the following steps: a) obtaining at least one calcium carbonate material, optionally, in form of an aqueous suspension; b) combined grinding of GCC and PCC, optionally, with at least another mineral material which is selected from talc, clay, Al2O3, TiO2 or mixtures thereof; c) optional sieving and/or concentration of the jointly ground calcium carbonate obtained at step (b); d) optional drying of the jointly ground calcium carbonate material obtained at step (b) or (c). The fraction of particles of the obtained material with size smaller than 1 mcm is greater than 80%, preferably greater than 85%, more preferably greater than 90% and even more preferably greater than 95%. BET specific surface area is less than 25 m2/g.

EFFECT: invention enables to increase lustre of enamel paper.

44 cl, 2 tbl, 5 ex

FIELD: chemistry.

SUBSTANCE: suspension containing calcium carbonate is obtained by adding one or more zirconium compounds and possibly one or more other additives which do not contain phosphate, acting as a dispersant and/or an additive which assists in grinding. Calcium carbonate in dry form and/or in form of an aqueous dispersion or filtered residue is added an aqueous suspension and/or aqueous emulsion and/or aqueous solution containing one or more zirconium compounds. The zirconium compounds used is ammonium zirconium carbonate or calcium zirconium carbonate or mixture thereof.

EFFECT: invention enables to avoid the use of phosphate dispersants when preparing stable aqueous suspensions of calcium carbonate and increases content of solid substance in the suspension.

17 cl, 22 ex

FIELD: printing industry.

SUBSTANCE: to produce a precipitated calcium carbonate, a suspension of calcium hydroxide is made by mixing of quicklime with water in a reactor with a mixer or in a tank, then the produced suspension is filtered via a 100-mcm filter. The filtered suspension is sent into a reactor of stainless steel equipped with a mixer. Temperature from 10 to 70°C is set, afterwards the suspension is sent into a reactor or a tank for carbonisation, where a carbon-containing gas is bubbled through the suspension. The suspension is drained from the tank, when electric conductivity achieves the minimum level, and pH falls below 8. Coarse particles are removed at a 45-mcm filter. At the same time the carbonisation stage is carried out at speed of carbonising gas flow of below 30 litres per minute under normal conditions per kg of calcium hydroxide in process of deposition. Concentration of precipitated calcium carbonate is increased using a cationic, anionic or combined disperser under quite moderate or mild conditions, which do not cause considerable damage of aggregates/agglomerates, until concentration from 25 to 60% is achieved, preferably in the range from 35 to 50%, most preferably - from 39 to 40 wt % of hard substances.

EFFECT: invention makes it possible to produce porous stable agglomerates of precipitated calcium carbonate with size of 1-5 mcm.

22 cl, 5 dwg, 17 tbl, 9 ex

FIELD: printing industry.

SUBSTANCE: to produce a precipitated calcium carbonate, a suspension of calcium hydroxide is made by mixing of quicklime with water in a reactor with a mixer or in a tank, then the produced suspension is filtered via a 100-mcm filter. The filtered suspension is sent into a reactor of stainless steel equipped with a mixer. Temperature from 10 to 70°C is set, afterwards the suspension is sent into a reactor or a tank for carbonisation, where a carbon-containing gas is bubbled through the suspension. The suspension is drained from the tank, when electric conductivity achieves the minimum level, and pH falls below 8. Coarse particles are removed at a 45-mcm filter. At the same time the carbonisation stage is carried out at speed of carbonising gas flow of below 30 litres per minute under normal conditions per kg of calcium hydroxide in process of deposition. Concentration of precipitated calcium carbonate is increased without using an agent that promotes dispersion or with application of a cationic disperser under quite moderate or mild conditions, which do not cause considerable damage of aggregates/agglomerates, until concentration from 15 to 50% is achieved, preferably in the range from 20 to 30%, most preferably - from 23 to 26 wt % of hard substances.

EFFECT: invention makes it possible to produce porous stable agglomerates of precipitated calcium carbonate.

22 cl, 5 dwg, 9 tbl, 12 ex

FIELD: textile fabrics, paper.

SUBSTANCE: method is related to production of coated paper or cardboard. Method includes application of pigment composition as coating on at least one side of paper or cardboard web. Specified pigment composition is water dispersion, which includes optionally aggregated colloidal particles of silicon dioxide or aluminium silicate as pigment particles, which are prepared from alkali metal silicate by ion exchange or pH reduction and having surface area of approximately from 30 m2/g to approximately 450 m2/g. Coating contains also at least one cationic component selected from group that consists of water-soluble aluminium salts and cationic polymers with molecular weight from approximately 2,000 to approximately 1,000,000 and charge density from approximately 0.2 mEq/g to approximately 12 mEq/g, in which at least approximately 0.4 g of pigment particles from pigment composition is applied on m2 of coated side of paper or cardboard web. Invention is also related to paper or cardboard produced by this method. It is also related to composition of above mentioned pigment in the form of water dispersion, which includes less than approximately 3 wt % of organic binders and to method of above mentioned pigment composition production, in which mixing is done to produce water dispersion in order to avoid gel formation and deposition.

EFFECT: improvement of printing and strength properties of coating, and also lower scuffing of paper.

26 cl, 5 tbl, 4 ex

FIELD: textiles; paper.

SUBSTANCE: composition is designed for refining fibrous material, can be used in the production of enamelled cardboard and paper and relates to the cellulose-paper industry. The composition contains a modified pigment and a water soluble binding substance. The pigment is calcium sulfoaluminate, modified starch or polyvinyl alcohol with mass ratio content of 0.5-1.5. The water soluble binding substance is starch.

EFFECT: resistance to fluffing and whiteness of the coating with considerable lowering of consumption of the binding substance when making the composition.

1 tbl

FIELD: textiles, paper.

SUBSTANCE: solution is meant for rifining of fibrous material. It pertains to the field of paper manufacturing and cardboard during manufacturing of chalk-overlay types of cardboard and paper. The solution consists of water soluble binder. A mixture of calcium salfoaluminate and kaolin, modified starch or polyvinyl spirit is used as the pigment. The technical result is high stability to picking, whiteness, colour perception and smoothness. The solution enhances adhesion of the coating to the base (cardboard or paper), which makes it possible to use the refined coating as a sub-layer when dual or tri-coating cardboard or paper, with obtaining products with a given range of characteristics.

EFFECT: obtaining of a solution for refining material for production of paper and cardboard during production of chalk-overlay types of cardboard and paper.

1 tbl, 1 exr

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: chemistry.

SUBSTANCE: present invention relates to composites comprising inorganic micropigments and/or filler in form of surface-phosphated microparticles, whose surface is at least partially coated with finely ground alkali-earth carbonate nanoparticles by means of binders based on copolymers comprising as the monomers one or more dicarboxylic acids and one or more monomers from a group of diamines, triamines, dialkanolamines or trialkanolamines and epichlorohydrin, a method of producing such composites, aqueous suspensions thereof and use thereof in papermaking or in production of paints and plastics as well as the use of the binders for coating of microparticles with nano alkali-earth carbonate.

EFFECT: providing pigment or filler composites and aqueous suspensions thereof, which have good optical properties, good printing properties and have low solvent absorption.

47 cl, 9 tbl, 11 dwg

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