Paper for inkjet recording

FIELD: printing.

SUBSTANCE: invention relates to printing material for inkjet printing and a method of manufacturing such printing material. The printed material comprises: a) a main layer having a first side and a back side; b) an absorption layer in contact with the first side of the main layer, at that the absorption layer has an absorption rate from 1×10-5 ms-0.5 to 1×10-3 ms-0.5, and/or the amount absorbed from 30 up to 95 vol. % relative to the total amount of the absorption layer; and c) a surface coating in contact with the absorption layer, at that the surface coating has permeability which is greater than 5.0×10-18 m2, and the surface coating comprises calcium carbonate.

EFFECT: improvement of the paper structure.

23 cl, 7 dwg, 4 tbl

 

PAPER FOR INKJET RECORDING

The present invention relates to the field of non-contact printing and, more specifically, to printed material for inkjet printing and method for manufacturing such printed material.

Digital printing is the fastest growing segment in the field of transmission of graphic information. It represents an increasing cost approach compared to traditional printing methods, providing print-on-demand at low levels of cost and environmental impact. In addition, personalized printed work can be used as promotional material for direct sale and publication. Thanks to new technology, the print speed and the print quality has risen to a level that can really compete with the level of traditional offset printing.

Generally, glossy paper for printing of publications and commercial products used in offset printing. These varieties usually contain a coating comprising a pigment, such as calcium carbonate, together with a binder material such as styrole-butadiene latex.

Technically it was impossible to use glossy grade offset paper in inkjet printers, mainly due to low absorption capacity of the coating control unit�AGI and anionic surface charge. As you know, these shortcomings lead to a high degree of mutual penetration of colors and heterogeneity of color when you use this inkjet printing technology.

On the other hand, it was also impossible to manufacture containing a coating of glossy types of paper for inkjet printing with traditional large machines for coating paper, which are intended for the manufacture of offset paper. This is due mainly to the fact that covered with high-quality paper for ink jet printing contains an absorption priming and surface treatment such as primer coating consisting of a highly porous precipitated silica, and surface coatings based on sverhdohodnaya polymers that together or separately are noted for poor rheological properties, low content of solids and, in the case of a final application for printing inks based on dyes, cationic character. In addition, the current paper for inkjet printing are overly complicated for future printing needs, because their absorption capacity exceeds the requirements of the new printing technology. Current products are also very costly to manufacture because �behold they include special materials, such as the above-mentioned pigment based on silica, and the high content of special binders and additives. In addition, rheological serious limitations associated with silicon dioxide, reduce the amount of solids in the coating and increase the viscosity Brookfield (Brookfield).

The material for inkjet printing, comprising a porous primary layer of precipitated calcium carbonate described in EP 1996408 and EP 1963445.

In WO 2009/095697 described coated paper sheet for inkjet printing, comprising a pigment, a binder, and the binder material includes, as a main component, a polymer containing the group-O-, -CO-, -OCO - and/or-COO - in their side chains, and water-soluble salt of a metal of group II or group III or transition metal.

For completeness we should mention the following applicant, which, in General, pigments are suitable for use in the paper, namely to compositions for coating paper: WO 99/52984, WO 00/39222, WO 01/04218, WO 2004/083316, WO 2006/109168, WO 2006/109171, WO 2010/029403, unpublished European patent application under the registration number 09170864.4 and unpublished European patent application under the registration number 10003665.6.

In the art there remains a need for high quality printed material that can be used with good effect on strain�x print devices and which can be fabricated using standard machine for coating on paper.

Accordingly, the present invention is to offer printed material that is suitable for inkjet printing and satisfies higher commodity requirements, and which can be manufactured at lower cost compared to existing covered materials for inkjet printing.

Another object of the present invention is to offer printed material that can be fabricated using standard machine for coating paper, which produces varieties of paper for offset printing. The next task of the present invention is to offer a printed material having excellent ability to be processed on large machines for coating paper. It would also be desirable to offer printed material that can be fabricated using standard high-speed machine for applying coating to paper.

It would also be desirable to offer printed material that is suitable for use for high-resolution printing and is suitable for high-speed inkjet printing. It would also be desirable to offer pecan�th material, which is suitable for Photocopying, which provides many applications of the paper.

The above and other problems are solved by the proposal of a printed material comprising a primary layer having a first side and a reverse side, an absorption layer in contact with the first side of the base layer, and the surface coating in contact with the absorption layer, wherein the surface coating has a permeability constituting more than 5.0×10-18m2.

The core layer may serve as the substrate for the absorption layer and the surface coating. The function of the absorption layer is to absorb the solvent ink which is applied on the printed material during the printing process, while the purpose of surface treatment is to create a functional layer, which acts as a filter for the paint, grabbing containing the pigment of the paint particles, but allowing the solvent to pass through to be absorbed, the absorption layer, or to create an absorbent surface to consolidate dye-based ink.

According to another aspect of the present invention, a method of manufacturing a printed material, comprising the following stages:

a) manufacturer� the base layer, having a first side and a reverse side;

(b) applying a liquid coating composition for the formation of the absorption layer on the first side of the base layer;

c) applying the liquid coating composition on the absorption layer for the formation of surface coatings; and

(d) drying the absorption layer and the surface coating, wherein the absorption layer and the surface coating is dried at the same time, or absorption layer is dried after step (b) and before applying the surface treatment stage (C)

in this surface coating has a permeability constituting more than 5.0×10-18m2.

Preferential embodiments of the present invention defined in the respective dependent claims.

According to one variant of implementation, the core layer is a paper without wood pulp or paper with a wood mass, preferably having a density of from 30 to 300 g/m2.

According to another embodiment of the absorption layer has an absorption rate of 1×10-5MS-0,5to 1×10-3MS-0,5and/or absorbed amount of from 30 to 95 vol.% in relation to the total volume of the absorption layer.

According to one embodiment of the absorption layer includes a pigment that, when it is in the form of a pack�otengo layer, has an absorption rate of 1×10-5MS-0,5to 1×10-3MS-0,5and/or absorbed amount of 35 to 95 vol.% in relation to total pigment. According to another embodiment of implementation, the pigment has a specific surface area equal to more than 25 m2/g, preferably from 25 to 100 m2/g or from 30 to 50 m2/g According to the following variant of implementation, the pigment has a specific surface area equal to more than 25 m2/g, the value of d5o from 0.3 to 3 μm and the porosity when it is in the form of a thickened layer of greater than or equal to 35%. According to another variant implementation, the pigment is a calcium carbonate, plastic pigment, such as a plastic pigment on the basis of polystyrene, titanium dioxide, dolomite, calcined clay, or a mixture thereof, or, if the pigment is a mixture of calcium carbonate, titanium dioxide, dolomite, calcined clay, or mixtures thereof with one or more of such materials as talc, 'green' clay or bentonite, wherein said pigment is a preferably calcium carbonate, is preferable to the modified calcium carbonate and/or precipitated calcium carbonate. According to another embodiment of the calcium carbonate is acicular, prismatic, spherical or rhombohedrons� form or represents any combination of these forms.

According to one embodiment of the absorption layer further comprises a binder material, preferably in an amount of from 1 to 50 wt. % relative to the total weight of the pigment. According to another embodiment of implementation, the binder material is chosen starch, polyvinyl alcohol, styrolene-butadiene latex, styrolene-acrylate latex or polyvinyl acetate latex, or a mixture thereof. According to another embodiment of the absorption layer has a coating density in the range of 3 to 50 g/m2preferably from 3 to 40 g/m2and most preferably from 6 to 20 g/m2.

According to one embodiment of the surface coating includes a pigment having a value of d50in the range of from 0.01 to 1.0 μm. According to another embodiment of the surface coating further comprises a binder material preferably in an amount of from 0.5 to 50 wt. % relative to the total weight of the pigment. According to another variant implementation, the binder material is chosen starch, polyvinyl alcohol, styrolene-butadiene latex, styrolene-acrylate latex, or polyvinyl acetate latex or a mixture thereof. According to another embodiment of the surface coating further comprises a rheological modifier in Koli�ETS, comprising less than 1 wt. % relative to the total weight of the pigment. According to another embodiment of the surface coating has a coating density in the range equal to from 1 to 50 g/m2preferably from 3 to 40 g/m2and most preferably from 6 to 20 g/m2.

According to one embodiment of the printed material further comprises a second absorption layer in contact with the back side of the base layer, and a second surface coating in contact with the second absorption layer.

According to one variant of implementation, the stage (b) to(d) of the invented method is also carried out on the reverse side of the base layer for the manufacture of printed material having a coating on the first side and the reverse side. According to another embodiment of the liquid coating composition used for formation of the absorption layer and/or surface coating has a solids content of 10 to 80 mass. %, preferably 30 to 60 mass. % and preferably from 45 to 55 mass. % relative to the total weight of the composition. According to another embodiment of the liquid coating composition used for formation of the absorption layer further comprises a dispersant, preferably a polyacrylate in an amount of from 0.05 to 5 mass. % and preferably in an amount of from 0.5 to 5 wt. % relative to the total weight of the pigment.

According to one embodiment of the coating compositions produced using the aqueous suspension of dispersed calcium carbonate in which the solids content is from 10 wt. % to 82 mass. %, preferably from 50 wt. % to 81 mass. % and preferably from 70 mass. % to 78 mass. % relative to the total weight of the aqueous suspension of dispersed calcium carbonate. According to another embodiment of the coating composition have a viscosity in the range of from 20 to 3,000 MPa·s, preferably from 250 to 3000 MPa·s and preferably 1000 to 2500 MPa·s. According to another embodiment of the coating composition is applied using a high-speed coating, metering press for bonding, glazed coating, spray coating or electrostatic coating, and preferably high-speed coating.

Brief description of the drawings

Fig. 1 represents the gloss of paper, which was measured for paper sheets containing various coating compositions, calendered at 300 kN/m.

Fig. 2 represents the optical density of the inkjet printing black paint, which was measured for paper sheets containing various coating compositions.

Fig. 3 is an optical prototype inkjet printing, which was measured for paper sheets containing various coating compositions.

Fig. 4 represents the heterogeneity of color for ink jet printing with black paint, which was measured for paper sheets containing various coating compositions.

Fig. 5 represents the heterogeneity of color in inkjet printing, which was measured for paper sheets containing various coating compositions.

Fig. 6 is a mutual penetration of colors in inkjet printing, which was measured for paper sheets containing various coating compositions.

Fig. 7 represents the dependence of the mutual penetration of colors in the color ink jet printing with gloss paper, which was measured for paper sheets containing various coating compositions.

For the purpose of the present invention, the term "absorption rate" is a measure for the amount of liquid that can absorb the coating or pigment within a certain time. When used in this document, the absorption rate is expressed by a linear relation between V(t)/A and √t, the gradient of which is a

where m(t) represents an increase of mass at time t, which is determined by the volume V(t) of a liquid with density ρ. Data are normalized to the square And cross�about section of the sample thus what the result is V(t)/A, i.e., the volume absorbed per unit cross-sectional area of the sample. The gradient can be obtained directly from the data on the graph, using linear regression analysis, and the result is the absorption rate of the incoming fluid. The absorption rate is expressed in MS-0,5. A device that can be used to determine the speed of absorption, described Schoelkopf et al. "Measurement and network modeling of liquid permeation into compacted mineral", (Journal of Colloid and Interface Science, 2000, 227(1), 119-131).

The term "permeability" within the meaning of the present invention is a characteristic internal structure of paper and can show how the paint will penetrate the sheet at a pressure of wetting or independent. When used in this document, the permeability is expressed in ml/min.

The term "density" when used in the present invention is defined as the weight of 500 sheets of the basic size and is expressed in g/m2.

The term "brightness" when used in the context of the present invention is a measurement of the percentage of diffuse light reflected from the paper surface. Brighter sheet reflects more light. When used in this document, the brightness of the paper can be measured at the average wavelength of light, which is 457 nm, and it is at b�Xia in percent.

For the purposes of the present invention, the term "coating" means one or more layers, sheets, films, membranes, etc., formed, created, made from a coating composition, which remains predominantly on the surface of the printed material.

The term "mutual mixing of colors when used in the context of this invention means mixing two different colors in two adjacent printed areas, or points, depending on the desired tone, before drying and absorption in the substrate. Mutual mixing of colors reduces the print quality.

For the purposes of the present invention, the term "gloss" refers to the ability of paper to reflect some portion of the incident light under the mirror angle. Glitter can be determined on the basis of quantitative measurement of light specularly reflected from the sample surface of the paper at a certain angle, comprising, for example, 75°, which is called the Shine at the angle of 75° and is expressed in percent.

"Ground calcium carbonate" (GCC) in the meaning of the present invention is a calcium carbonate obtained from natural sources including marble, chalk or limestone, and subjected to processing such as grinding, sieving and/or fractionation, in wet and/or dry condition, for example, using a cyclone.

For the purposes of nastojasih� of the invention, the term "ink jet printing" means digital printing technology, method, device, etc., which are able to create images on paper by sprinkling, the direction of the jet, etc., tiny droplets of liquid inks on paper through a nozzle printing device. The size (e.g., smaller size), the exact location and other parameters of the droplets of ink can be used for high quality inkjet prints. Ink jet printing can include continuous ink jet printing, impulse ink jet printing, etc.

For the purposes of the present invention, the term "nonuniform coloration" means inhomogeneous printed image, which may occur due to nonuniform application of paint, non-uniform absorption of the paint, etc. on the surface of the paper.

The term "optical print density" when used in the context of the present invention is a measure of the extent to which a printing region transmits the selected filtered light, which is measured in backscattering mode. Optical density is a measure of the thickness of the color layer on the substrate. The optical density value is calculated on the basis of spectral measurements, thus, there may be minor differences when measured with a densitometer. The calculation was carried out according to DIN 16536-2. The optical density of the print was measured using�UY spectrophotometer Gretag-Macbeth Spektrolino.

The term "opacity" within the meaning of the present invention is a percentage measure of the light passing through a sheet of paper. The more opaque the paper is, the less visible is the printed image on the reverse side of the sheet. When used in this document, the opacity is expressed in percentage.

For the purposes of the present invention, the term "smoothness of paper" means the degree to which the surface (covered) printed material deviates from a flat or substantially flat surface. When used in this document, the smoothness of the paper surface is measured, for example, by the method of Parker (Parker) to determine the smoothness of the print and is expressed in microns.

Throughout the text of this document, the term "particle size" of the pigment is described by the distribution of its particle size. The value of dxrepresents a diameter that χ masses. % of the particles have smaller diameters than dx. Thus, the value of d20represents a particle size that exceeds the size of the 20 masses. % of all particles, and the value of d75represents a particle size that exceeds the size of 75 mass. % of all particles. Therefore, the value of d50represents the median particle size, i.e. 50 wt. % of all grains are larger or smaller than this resorcylic. For the purposes of the present invention, the particle size is expressed as mass median particle size of d50unless there are other condition. When determining the mass median particle size value (d50for particles where the value of d50is more than 0.5 μm, it is possible to use the device Sedigraph 5100 from the company Micromeritics, USA.

For the purposes of the present invention, the term "permeability" means the ease with which a fluid can flow through preformed surface treatment. When used in this document, the permeability is expressed in the form of a constant permeability Darcy) k, using the equation:

where dV(t)/dt is the flow or the volumetric rate of flow through a unit cross-sectional area Α, ΔΡ is a applied to the sample the difference in pressure, η is the fluid viscosity, and l represents the length of the sample. The results are presented in the form of a constant K and is expressed in m2. Detailed description of the method of measuring permeability can be found in Ridgway et al. "Α new method for measuring the liquid permeability of coated and uncoated papers and boards", Nordic Pulp and Paper Research Journal), 2003, 18(4), 377-381.

The term "pigment" in the sense of the present invention may be a mineral or synthetic pigment pigment. For the purposes of this�th invention "mineral pigment" is a solid, having a definite chemical composition and characteristic crystalline structure, while "synthetic pigment" represents, for example, plastic pigment-based polymer. For the purposes of the present invention, the speed of absorption, porosity and the absorbed amount of the pigment is determined, when the pigment is in the form of a compacted layer, i.e. in the form of a pelletized composition. Detailed description of the fabrication of a sealed layer or tableted compositions of slurries or suspensions of pigments can be found in Ridgway et al. "Modified calcium carbonate coatings with rapid absorption and extensive liquid uptake capacity", (Colloids and Surfaces A: Physicochem. and Eng. Asp.), 2004, 236(1-3), 91-102.

"Precipitated calcium carbonate" (PCC) in the meaning of the present invention is a synthesized material, generally obtained by precipitation from the reaction of carbon dioxide and lime in an aqueous environment or by precipitation of calcium and carbonate in the water, or by precipitation from a solution of calcium ions and carbonate, for example, after the reaction of CaCl2Na2CO3.

The term "porosity" in the description of covered and dried coating compositions in the value of the present invention is a relative pore volume of coating paper and is expressed in percent. Porosity can be measured using a mercury Boromir Autopore IV 9500 from the company Micromeritics, in which max�mum used absolute pressure of mercury is 414 MPa (60000 pounds per square inch). The time of establishing the equilibrium, which is used whenever the pressure is 60 seconds. This device measures the diameters of pores in the range from 0.004 μm to 360 μm.

Mercury Boromir based on this physical principle that directionspoint non-wetting liquid penetrates into the pores until then, not yet applied enough pressure to ensure its penetration. The ratio between the applied pressure and the pore size into which mercury penetrates, is given by the equation of young-Laplace (Young-Laplace):

where Ρ represents the applied pressure, D represents the equivalent diameter of the capillary, γ represents the surface tension of mercury (0.48 Nm-1), and θ represents a contact angle between mercury and the wall of the pores, usually taken equal to 140°. The required pressure is inversely proportional to the pore size, and requires only a slight pressure for the introduction of mercury in large micropores, while significantly more pressure is required for the introduction of mercury into the nanopores. Detailed description of the method of measurement of porosity using mercury are described in Webb and Orr, "Analytical Methods in Fine Particle Technology", published by Micromeritics Instrument Corporation, 1997, ISBN 0-9656783-0-X.

For the purposes of the present invention, the term "rheology modifier" means an additive that increases�t the fluidity of the coating composition.

"Specific surface area" (SSA) mineral pigment in the value of the present invention is the ratio of the surface area of the mineral pigment and the mass of the mineral pigment. When used in this document, the specific surface area measured by adsorption isotherms using BET according to ISO 9277:1995 and is expressed in m2/g.

For the purposes of the present invention, the term "layer thickness" means the thickness of the layer after drying the applied coating composition.

For the purposes of the present invention, the term "viscosity" in relation to a coating composition means the viscosity brookfiled. The viscosity brookfiled can be measured by using Brookfield viscometer at 23°C and 100 Rev/min and expressed in MPa·s.

The term "volume absorbed" within the meaning of the present invention is a volume of liquid that can absorb 1 g of a porous solid material or a covering layer. When used herein the absorbed volume is defined as the ratio of the available pore volume, which is measured using a mercury porometry, and the mass of the sample and expressed in cm3/g. the Absorbed amount can also be expressed as a percentage, using the following equation:

in which pore volume is calculated from the absolute poglosenijam, skeletal mass is equal to the weight of the coating, and the skeletal density depends on the pigment used and is 2.7 g/cm3for carbonate.

The printed material according to the invention includes a main layer having a first side and a reverse side, an absorption layer in contact with the first side of the base layer, and the surface coating in contact with the absorption layer, where the surface coating has a permeability constituting more than 5.0×10-18m2. Optionally, the printed material may further include a second absorption layer in contact with an underside of the base layer, and a second surface coating in contact with the second absorption layer. Further components or parts of the printing material will be described in more detail.

The base layer

The printed material according to the present invention includes a primary layer, which can serve as the substrate for absorption layer, and surface treatment, and it can be opaque, translucent or transparent. The core layer may be, for example, a paper substrate, a plastic substrate, metal foil, fabric or glass material.

According to one embodiment of the present invention, the core layer performance�em a paper substrate. The paper substrate may be paper without wood pulp or paper with a wood mass. Suitable wood pulp, which consists of a paper substrate may be, for example, natural pulp of wood, recovered wood pulp, synthetic wood pulp or similar material, and mixtures thereof. In the paper backing can be implemented, if necessary, various additives such as adhesive, power strength of the paper, filler, antistatic agent, fluorescent Brightener and dye, which are commonly used in paper production. In addition, the surface of the paper substrate can be coated using the adhesive, the amplifier strength of the paper, fluorescent Brightener, an antistatic agent, a dye fixing material and similar materials. If required, the surface of the paper substrate can be subjected to increase the smoothness of the treatment using a calender device during or after manufacture of the paper.

The paper substrate may have a density component from 5 to 600 g/m2from 10 to 500 g/m2from 20 to 400 g/m2or from 30 to 300 g/m2.

According to another embodiment of the primary layer is a plastic substrate. Suitable plastic materials include koinopolitia resin, e.g.�p, polyethylene terephthalate, polyethylenterephthalat and poliviniatsetat, polycarbonate resin or fluorine-containing resin, e.g., polytetrafluoroethylene (PTFE).

The core layer may have a thickness equal to from 1 to 1000 μm, from 10 to 500 μm, or from 50 to 400 μm. According to a preferred embodiment of the primary layer has a thickness of from 75 to 300 microns, or from 100 to 200 microns.

Absorption layer

The absorption layer is in direct contact with the first side of the base layer, and optionally, the second absorption layer may be in direct contact with the underside of the base layer. The function of the absorption layer is to absorb the solvent ink which is applied on the printed material during the printing process. Colorful compositions used in inkjet printing typically are liquid compositions comprising a liquid diluents or carriers, dyes or pigments, wetting means, organic solvents, surfactants, thickeners, preservatives and other such materials. Liquid diluent or carrier may be pure water, or it may be water mixed with other water-miscible solvents such as polyhydric alcohols. Also, you can use ink jet printing �and the basis of oil as the carrier.

According to one embodiment of the absorption layer has an absorption component from 1×10-5MS-0,5up to 5×10-3MS-0,5preferably from 1×10-4MS-0,5up to 5×10-4MS-0,5and/or absorbed amount constituting from 30 to 95 vol.%, preferably 40 to 70 vol.% in relation to the total volume of the absorption layer.

According to one embodiment of the absorption layer includes a pigment. Suitable pigment is, for example, a pigment that, when it is made of compacted layer has an absorption component from 1×10-5MS-0,5to 1×10-3MS-0,5and/or absorbed amount constituting from 35 to 95 vol.%, preferably 40 to 70 vol.% in relation to the total volume of the pigment.

According to an exemplary embodiment of the, the pigment has a specific surface constituting from 25 to 200 m2/g, for example, from 25 to 100 m2/g or from 30 to 50 m2/g.

The pigment can have a value of d50constituting from about 0.1 to 10 μm, from about 0.2 to 6.0 μm, or from about 0.25 to 4.0 μm. Preferably, the pigment has a value of d50of approximately from 0.3 to 3.0 microns.

According to one exemplary embodiment of the, pigment, when it is in the form of a compacted layer, haibara has�first surface, component of more than 25 m2/g, the value of d50comprising from 0.3 to 3 μm, and a porosity of greater than or equal to 35%.

According to one embodiment of the present invention, the pigment is a mineral pigment. Suitable mineral pigment may be a carbonate, for example, being in such form as ground calcium carbonate, modified calcium carbonate, or precipitated calcium carbonate or a mixture thereof. Natural fine-graded calcium carbonate (GCC) can represent, for example, one or more materials such as marble, limestone, chalk and/or dolomite. Precipitated calcium carbonate (PCC) can represent, for example, one or more of such mineralogical crystal forms, aragonite, poterit and/or calcite. Aragonite is commonly found in a needle-shape, while poterit belongs to hexagonal crystal system. Calcite can form scalenohedral, prismatic, spherical and rhombohedral forms. The modified calcium carbonate may be a natural finely dispersed or precipitated calcium carbonate surface-modified and/or internal structure, for example, calcium carbonate may also be treated or coated with a water-repellent Mat�the Rial for application to the surface, such as, for example, aliphatic carboxylic acid or a siloxane. Calcium carbonate can be treated or coated in such a way that it becomes cationic or anionic, using, for example, polyacrylate or chloride of polydiallyldimethyl.

Preferably the mineral pigment is a modified calcium carbonate or precipitated calcium carbonate, or a mixture thereof. Examples of types of calcium carbonate that can be used in absorption layer according to the present invention, described for example in EP 1712523 or US 6666953.

According to one embodiment of the calcium carbonate is acicular, prismatic, spherical or rhombohedral in shape or represents any combination of these forms.

According to one embodiment of the calcium carbonate is prepared from an aqueous suspension of dispersed calcium carbonate. According to one embodiment of the present invention, the aqueous suspension of dispersed calcium carbonate has a solids content of 10 mass. % to 82 mass. %, preferably from 50 wt. % to 81 mass. % and preferably from 70 mass. % to 78 mass. % relative to the total weight of the aqueous suspension of dispersed calcium carbonate. According to one preferred embodiment of the present invention the aqueous suspension of dispersed calcium carbonate is a concentrated aqueous suspension of dispersed calcium carbonate, which preferably has a solids content of 70 mass. % to 78 mass. % relative to the total weight of the aqueous suspension of dispersed calcium carbonate.

In addition to calcium carbonate, the absorption layer may further include mineral pigments and synthetic pigments. Examples of additional mineral pigments include silica, alumina, titanium dioxide, clay, calcined clay, barium sulfate or zinc oxide. Examples of synthetic pigments include plastic pigments such as styrene pigments and ROPAQUE™.

However, instead of calcium carbonate absorption layer may contain any other pigment, which, when it is in the form of a compacted layer has an absorption rate of 1×10-5MS-0,5to 1×10-3MS-0,5and/or absorbed amount of 35 to 95 vol.%, preferably from 40 to 70 vol.% in relation to the total volume of the pigment.

According to an exemplary embodiment of the pigment is a calcium carbonate, plastic pigment, such as a plastic pigment on the basis of polystyrene, titanium dioxide, dolomite, calcined clay, or a mixture thereof, or a pigment is a mixture of calcium carbonate, titanium dioxide, dolomite, calcined clay, or mixtures thereof with one or more of such materials as talc, the product�Lenno clay or bentonite, wherein said pigment is a preferably calcium carbonate, is preferable to the modified calcium carbonate and/or precipitated calcium carbonate.

The amount of pigment in the absorption layer may range from 40 to 99 mass. %, for example, from 45 to 98 mass. %, preferably from 60 to 97 mass. % relative to the total weight of the absorption layer.

The absorption layer may further contain a binder. Any suitable polymeric binder material can be used in absorption layer according to the present invention. For example, the polymer binder may be a hydrophilic polymer such as, for example, polyvinyl alcohol, polyvinylpyrrolidone, gelatin, cellulose ethers, polyoxazolines, polyvinylacetate, a mixture of partially hydrolyzed polyvinyl acetate and polyvinyl alcohol, polyacrylic acid, polyacrylamide, polyalkylene, sulfonated or phosphated polyesters and polystyrenes, casein, Zein, albumin, chitin, chitosan, dextran, pectin, derivatives of collagen, collodion, agar-agar, arrowroot, guar, carrageenan, starch, tragakant, xanthan gum, or Ramzan and mixtures thereof. In addition, you can use other binder materials, such as hydrophobic materials, for example, a copolymer of styrene and butadiene, poliuretanovye, slozhnoprofilnyh latex, poly-n-butyl acrylate, poly-n-butylmethacrylate, poly-2-ethylhexylacrylate, copolymers of n-butyl acrylate and ethyl acrylate, copolymers of vinyl acetate and n-butyl acrylate and similar materials.

According to one variant of implementation, the binder material is a natural binder selected from starch and/or polyvinyl alcohol. According to another embodiment of implementation, the binder is a synthetic binder material selected from styrolene-butadiene latex, styrolene-acrylate latex or polyvinyl acetate latex. The absorption layer can also be obtained as a mixture of hydrophilic and latex binders, for example, a mixture of polyvinyl alcohol and styrolene-butadiene latex.

According to one variant of implementation, the amount of binder material in the absorption layer is between 0 and 60 wt. %, 1 to 50 wt. % or between 3 and 40 wt. % relative to the total weight of the pigment.

The absorption layer may further contain optional additives. Suitable additives may include, for example, dispersing agents, plasticizers, surfactants, rheological modifiers, defoamers, fluorescent brighteners, dyes or pH regulators. According to one exemplary embodiment is p�effect, additive is a cationic additive, for example, cationic dye fixative or flocculant on the basis of metal ions for containing paint pigments.

According to an exemplary embodiment of the, the pigment is dispersed using a dispersant. The dispersant can be used in amounts of 0.01 to 10 wt. percent, from 0.05 to 8 mass. %, from 0.5 to 5 wt. % from 0.8 to 3 wt. percent, or from 1.0 to 1.5 wt. % relative to the total weight of coating composition. In a preferred embodiment of the pigment is dispersed by adding a dispersant at a level of from 0.05 to 5 mass. % and preferably from 0.5 to 5 wt. % relative to the total weight of coating composition. As a suitable dispersant is preferably chosen substance from the group comprising homopolymers or copolymers of salts of polycarboxylic acids, such as, for example, acrylic acid, methacrylic acid, maleic acid, fumaric acid or taconova acid and acrylamide or mixtures thereof. Especially preferred are homopolymers or copolymers of acrylic acid. Molecular mass Mwsuch products preferably is in the range of 2000-15000 g/mol, and the molecular mass Mwfrom 3000 to 7000 g/mol is particularly preferred. In addition, the molecular mass Mwsuch products �predpochtitelno is in the range of 2000 to 150000 g/mol, especially preferred is a molecular mass Mwfrom 15000 to 50000 g/mol, for example, from 35000 to 45000 g/mol. According to an exemplary embodiment of the, the dispersant is a polyacrylate.

The molecular weight of the plasticizer and/or dispersant is selected so that they do not act as binders, but instead are sharing connections. Polymers and/or copolymers can be neutralized with monovalent and/or multivalent cations, or they may contain free acid groups. Suitable monovalent cations include, for example, sodium, lithium, potassium or ammonium. Suitable polyvalent cations include, for example, calcium, magnesium, strontium or aluminum. The combination of sodium and magnesium is particularly preferred. Plasticizers and/or dispersants such as polyphosphates of sodium and/or poliasparaginovaya acid, and corresponding salts of alkaline and/or alkaline earth metals, sodium citrate and amines, alkanolamines, such as triethanolamine and triisopropanolamine can also be used mainly individually or in combination with others. You can also use a dispersant based on ORGANOMETALLIC compounds. However, you can also use any other dispersant.

The absorption layer can� have a thickness, component of at least 5 μm, for example at least 10 μm, 15 μm or 20 μm.

The absorption layer may have a density of the coating constituting from 3 to 50 g/m2from 3 to 40 g/m2or from 6 to 20 g/m2.

Surface treatment

Surface coating is in direct contact with the absorption layer on the first side of the base layer, and optionally the second surface treatment may be in direct contact with optional second absorption layer on the back side of the base layer. The purpose of surface treatment is to create a functional layer, which acts as a filter for paint, capturing particles containing the pigment of paint or adsorbing dye-based colorants, but allowing the solvent to pass through to be absorbed by the absorption layer.

The authors present invention found that the absorption capacity of the printing material can be increased by using an absorption layer in combination with a surface coating having a certain permeability.

According to one embodiment of the surface coating has a permeability constituting more than 5.0×10-18m2preferably from 5.0×10-18to 1.5×10-14m2or from 6.0×10-18to 1.3×10-16 2.

According to one embodiment of the surface coating includes a pigment.According to an exemplary embodiment of the, the pigment has a specific surface area of from 5 to 200 m2/g, for example, from 10 to 30 m2/g or from 10 to 20 m2/g.

According to one exemplary embodiment of the use of the pigment with a very narrow distribution of small particle size. The pigment ratio of d20and d75is preferably from 5 to 60. The ratio of d20and d75is preferably from 10 to 50 and most preferably from 15 to 40.

Pigment, for example, may have a value of d50constituting from about 0.01 to 5.0 μm, from about 0.1 to 5.0 μm, from about 0.2 to 4.0 microns, or from about 0.25 to 3.5 µm.

Preferably, the pigment has a value of d50from about 0.3 to 3.0 microns.

According to one embodiment of the present invention, the pigment is a mineral pigment. Mineral pigment may be a carbonate, for example, be in such form as ground calcium carbonate, modified calcium carbonate, precipitated calcium carbonate or a mixture thereof. Natural ground calcium carbonate may contain, for example, one or more materials, such as marble, Izvestia�, chalk and/or dolomite. Precipitated calcium carbonate may be, for example, one or more of such mineralogical crystal forms, aragonite, poterit and/or calcite. Aragonite is commonly found in a needle-shape, while poterit belongs to hexagonal crystal system. Calcite can form scalenohedral, prismatic, spherical and rhombohedral forms. The modified calcium carbonate may be a natural finely dispersed or precipitated calcium carbonate surface-modified and/or internal structure. Such products are treated with reagents surface can be obtained, for example, according to WO 00/39222, WO 2004/083316, WO 2005/121257, WO 2009/074492, unpublished European patent application under the registration number 09162727.3 and unpublished European patent application under the registration number 09162738.0.

Preferably the mineral pigment is a modified calcium carbonate or precipitated calcium carbonate or a mixture thereof. Examples of types of calcium carbonate that can be used in the surface treatment of the present invention are described, for example, in EP 1712523 or US 6666953.

According to one embodiment of the calcium carbonate is acicular, prismatic, spherical or rhombohedrons�them by the form of or represents any combination of these forms.

According to one embodiment of the calcium carbonate get using aqueous suspension of dispersed calcium carbonate. According to one embodiment of the present invention, the aqueous suspension of dispersed calcium carbonate has a solids content of 10 mass. % to 82 mass. %, preferably from 50 wt. % to 81 mass. %, and preferably between 70 wt. % to 78 mass. % relative to the total weight of the aqueous suspension of dispersed calcium carbonate. According to one preferred embodiment of the present invention, the aqueous suspension of dispersed calcium carbonate is a concentrated aqueous suspension of dispersed calcium carbonate in which the solids content is preferably from 70 mass. % to 7 8 mass. % relative to the total weight of the aqueous suspension of dispersed calcium carbonate.

In addition to calcium carbonate, surface treatment may include additional mineral pigments and synthetic pigments. Examples of additional mineral pigments include silica, alumina, titanium dioxide, clay, calcined clay, barium sulfate or zinc oxide. Examples of synthetic pigments include plastic pigments such as styrene pigments and ROPAQUE™.

However, instead of calcium carbonate surface treatment may include any other pigment, provided that the surface coating has a permeability constituting more than 5.0×10-18m2.

According to an exemplary embodiment of the pigment is a calcium carbonate, plastic pigment, such as a plastic pigment on the basis of polystyrene, titanium dioxide, dolomite, calcined clay, or a mixture thereof, or a pigment is a mixture of calcium carbonate, titanium dioxide, dolomite, calcined clay, or mixtures thereof with one or more of such materials as talc, 'green' clay or bentonite, wherein said pigment is a preferably calcium carbonate, is preferable to the modified calcium carbonate and/or precipitated calcium carbonate.

The amount of pigment in the surface coating can comprise more than 50 wt. %, for example, from 50 to 99 mass. %, preferably from 60 to 98 mass. %, preferably from 7 0 to 90 wt. % relative to the total weight of the surface coating.

In addition, the surface coating may contain a binder. In the surface coating according to the present invention may be any suitable polymeric binder material. For example, the polymeric binder material may represent�ü a hydrophilic polymer, such as, for example, polyvinyl alcohol, polyvinylpyrrolidone, gelatin, cellulose ethers, polyoxazolines, polyvinylacetate, a mixture of partially hydrolyzed polyvinyl acetate and polyvinyl alcohol, polyacrylic acid, polyacrylamide, polyalkylene, sulfonated or phosphated polyesters and polystyrenes, casein, Zein, albumin, chitin, chitosan, dextran, pectin, derivatives of collagen, collodion, agar-agar, arrowroot, guar, carrageenan, starch, tragakant, xanthan gum or Ramzan and mixtures thereof. In addition, you can use other binder materials, such as hydrophobic materials, for example, a copolymer of styrene and butadiene, polyurethane latex, slozhnoprofilnyh latex, poly-n-butyl acrylate, poly-n-butylmethacrylate, poly-2-ethylhexylacrylate, copolymers of n-butyl acrylate and ethyl acrylate, copolymers of vinyl acetate and n-butyl acrylate and similar materials.

According to one variant of implementation, the binder material is a natural binder selected from starch and/or polyvinyl alcohol. According to another embodiment of implementation, the binder is a synthetic binder material selected from styrolene-butadiene latex, styrolene-acrylate latex or polyvinyl acetate latex. Surface coating that can�to contain a mixture of hydrophilic and latex binders, for example, a mixture of polyvinyl alcohol and styrolene-butadiene latex. Preferably made layer containing the selected pigment and the binder material should not be impermeable by the use of bonding material. In particular, it may be appropriate to use soluble binder materials.

According to one variant of implementation, the amount of binder in the surface coating is from 0 to 60 wt. %, from 0.5 to 50 wt. %, from 1 to 40 wt. %, from 2 to 30 wt. % or from 3 to 20 mass. % relative to the total weight of the pigment. In a preferred embodiment of the surface treatment contains approximately 5 wt. % binder, preferably styrolene-butadiene latex, relative to the total weight of the pigment.

Surface coating may further contain optional additives. Suitable additives may include, for example, dispersing agents, plasticizers, surfactants, rheological modifiers, defoamers, fluorescent brighteners, dyes or pH regulators. According to an exemplary embodiment of the surface coating further comprises a rheological modifier to improve the fluidity of a coating composition. The rheological modifier may be present in amounts SOS�aplauses from 0 to 60 wt. %, 0.1 to 50 wt. %, from 0.2 to 40 wt. %, from 0.3 to 30 wt. % or from 0.5 to 20 wt. % relative to the total weight of the pigment. According to an exemplary embodiment of the, the rheological modifier is present in amounts constituting less than 1% by weight. % relative to the total weight of the pigment, for example, in an amount constituting from 0.1 to 0.9 mass. %, from 0.2 to 0.8 wt. % or about 0.5 wt. %. According to another exemplary embodiment of the surface coating further includes kationnymi or anonymousi material.

The surface coating may have a thickness equal to at least the diameter of the largest particles of mineral and/or synthetic pigment in the surface coating. According to one variant of implementation, the thickness of the surface coating is from 10 nm to 30 μm, from 1 μm to 18 μm, or from 4 μm to 10 μm.

The surface coating may have a coating density in the range of 1 to 50 g/m2from 3 to 40 g/m2or from 6 to 20 g/m2.

Production of printed material

According to one variant of implementation, the method of manufacturing a printed material comprising the following steps: (a) the manufacture of the base layer having a first side and a reverse side, (b) applying a first liquid coating composition for the formation of the absorption layer on the first side �ASIC layer, (C) applying a second liquid coating composition on the absorption layer for the formation of surface coatings, and (d) drying the absorption layer and the surface coating where the absorption layer and the surface coating is dried at the same time, or absorption layer is dried after step (b) and before applying the surface treatment stage (C), wherein the surface coating has a permeability constituting more than 5.0×10-18m2.

According to one variant of implementation, the stage (b), (C) and (d) are also carried out on the reverse side of the base layer for the manufacture of printed material having a coating on the first side and the reverse side. These stages can be carried out on each side separately, or they can be carried out simultaneously on the first and the reverse side.

According to one embodiment of the method according to the invention, the absorption layer and the surface coating is dried at the same time. According to another embodiment of the method according to the invention, the absorption layer is dried after step (b) and before applying the surface treatment stage (C).

According to another embodiment of the first liquid coating composition comprising pigment, which, when it is in the form of a compacted layer has an absorption component from 1×10-5 MS-0,5to 1×10-3MS-0,5and/or absorbed amount constituting from 35 to 95 vol.%, preferably from 40 to 70 vol.% in relation to the total volume of the pigment.

Absorption layer and the surface coating can be applied on the core layer, using conventional methods of coating, normally used in the art. Suitable methods for applying the coatings are, for example, air doctor coating, electrostatic coating, metering press for gluing, film coating, spray coating, coating spiral wire roller, slit coating, the coating of a moving bunker, the coating is grooved roller, irrigation coverage, high-speed coating and such ways. Some of these methods provide simultaneous coating of two or more layers, which is preferable from the standpoint of efficiency of production.

In an exemplary embodiment of the coating composition is applied using a high-speed coating, metering press for bonding, glazed coating, spray coating or electrostatic coating.

In a preferred embodiment of the high-speed coating used for coating absorption layer and/or surface coatings. In yet another preferred �the Ariant implementation of the irrigation method of coating is used for the simultaneous application of the absorption layer and the surface coating. Irrigation coverage can also be used for consistent application of the absorption layer and the surface coating.

According to an exemplary embodiment of the first liquid coating composition used for formation of the absorption layer further comprises a dispersant, for example, polyacrylate, in an amount of from 0.05 to 5 mass. %, preferably in an amount of from 0.5 to 5 wt. % relative to the total weight of the pigment.

According to another exemplary embodiment of the coating compositions produced using the aqueous suspension of dispersed calcium carbonate in which the solids content is from 10 wt. % to 82 mass. %, preferably from 50 wt. % to 81 mass. % and preferably from 7 to 0 of the masses. % to 7 8 mass. % relative to the total weight of the aqueous suspension of dispersed calcium carbonate. According to one preferred embodiment of the present invention, a coating composition is produced using the aqueous suspension of dispersed calcium carbonate in which the solids content is from 70 mass. % to 78 mass. % relative to the total weight of the aqueous suspension of dispersed calcium carbonate.

A coating composition may have a viscosity Brookfield in the range of from 20 to 3,000 MPa·s, preferably from 250 to 3000 MPa·si preferably from 1000 to 2500 MPa·s.

After drying, the absorption layer can be further processed prior to application of surface coatings. According to one variant of implementation, the absorptive coating is subjected to calendering prior to application of surface coatings.

After coating the printed material can be subjected to calendering or supercalendering to increase surface smoothness. For example, the calendering can be carried out at a temperature from 20 to 200°C, preferably from 60 to 100°C, using, for example, the calender having from 2 to 12 clips. These clamps can be hard or soft, for example, it can be hard clips made of ceramic material. According to one exemplary embodiment of the printed material with a double coating is subjected to calendering at 300 kN/m, to obtain a glossy finish.

According to another exemplary embodiment of the printed material with a double coating is subjected to calendering at 120 kN/m, to obtain a matte finish.

Examples

The following examples represent various test types of paper that have been manufactured and tested quality inkjet printing using the ink for inkjet printing and multifunction Kodak printer Kodak EASYSHARE 5500.

To determine wt�new median particle size of d 50in the case of particles where the value of d50is more than 0.5 μm, used the device Sedigraph 5100 from the company Micromeritics, USA. The measurement was carried out in an aqueous solution of 0.1 wt. % Na4P2O7. The samples were dispersively using a high speed mixer and ultrasound. To determine the volume median particle size in the case of particles where the value of d50is not more than 500 nm, used the device Malvern Zetasizer Nano ZS from the company Malvern (UK). The measurement was carried out in an aqueous solution of 0.1 wt. % Na4P2O7. The samples were dispersively using a high speed mixer and ultrasound.

The viscosity Brookfield was measured using the using Brookfield viscometer DVII+ at 100 rpm and 23°C. the brightness of the pigment and opacity were measured using an ELREPHO device 3000 from the company Datacolor, ISO 2496. Air permeability was determined using a device for measuring the air permeability of the LW from the company Lorentzen & Wettre, in accordance with ISO 5636-5. The abrasion resistance with the black paper was determined, using a device for testing the abrasion Quartant according to the following method: used covered with paper and painted black drawing paper Folia from Max Bringmann KG (Germany) at a load of 600 g, and covered with the paper rotated belong�till then black paper. Gloss of paper is measured using laboratory equipment LGDL-05.3 from the company Lehmann Messsysteme GmbH (Koblenz, Germany), according to ISO 8254-1. The optical density of the print was measured using a spectrophotometer Gretag-Macbeth Spektrolino, according to DIN 16536-2. The nonuniformity of coloration and mutual mixing colours were determined using the solution generated by the software Rarawa, and internal test procedure developed by Omya AG.

Compacted layer or preformed pigment composition produced by applying a constant pressure, usually 15 bar (1.5 MPa), to a slurry or suspension of pigment in a few hours, so that the water was separated by filtration through a thin (less than 0.025 μm) membrane filter, receiving a compacted layer or tablet pigment with a diameter of 2.5 cm and a thickness of 1 to 1.5 cm is Used is shown schematically in Ridgway et al. "Modified calcium carbonate coatings with rapid absorption and extensive liquid uptake capacity", (Colloids and Surfaces A: Physicochem. and Eng. Asp.), 2004, 236(1-3), 91-102. Tablets were removed from the device and dried in an oven at 60°C for 24 hours.

According to Schoelkopf et al. "Measurement and network modeling of liquid permeation into compacted mineral blocks", (Journal of Colloid and Interface Science), 2000, 227(1), 119-131, to measure the "rate of absorption", samples of the compacted layer was coated with a thin protective silicone wrap around onewayfurniture faces, rising from the base plane to reduce the artifacts caused by wetting their external surfaces. To the rest of the external surfaces were not coated, but left to the free movement of displaced air or fluid during absorption, and minimize any interaction between the organosilicon compound and the absorbed liquid. After dropping off the sample before contact with the source of absorbable fluid reducing the weight of the vessel was continuously recorded using an automated microbalance, namely PC-controlled microbalance AH from Mettler Toledo with a precision of 0.1 mg, is able to perform 10 measurements per second, given any evaporation, if it had taken place. The measurements were completed, when the measured weight became constant, indicating saturation of absorption. Knowledge of the mass of the sample before and after the absorption measurement allows us to calculate the volume absorbed per 1 g of sample. (Divide the difference of the mass density of the liquid volume introduced into the sample, and, consequently, the volume of 1 g of the sample).

According to the article Ridgway et al. "Α new method for measuring the liquid permeability of coated and uncoated papers and boards", Nordic Pulp and Paper Research Journal), 2003, 18(4), 377-381, to measure the permeability of the investigated samples were prepared by placing a cuboid piece of material in the form of �of tabletki (compacted layer), has an area of 15 mm χ 15 mm and height 10 mm, in the form of PTFE and around it poured resin Technovit 4000 from the company Heraeus GmbH (Wehrheim, Taunus, Germany) to obtain a sample in the form of a disk having a diameter of 30 mm. Rapidly increasing the viscosity of selected curable resin leads to local infiltration of approximately 1 mm at the external borders of the sample.

This depth of penetration is clearly visible due to the opacity change on the edge of the sample, and can thus be calibrated. Defined open area of the porous sample, i.e., free from resin area, as a result it was possible to identify permeable cross-sectional area. The disks of the samples was placed in a vessel containing the measuring liquid to saturate the porous structure of the sample before placing it in the measuring device.

In the experiments used hexadecan with density ρ=773 kg/m3and the viscosity η=0,0034 kg·m-1·-1to exclude any interaction with a synthetic or natural binder materials in case of their presence. The disc sample was then placed in the cell under design pressure. Design of a cell for the study of permeability under pressure is described in Ridgway et al., (Nordic Pulp and Paper Research Journal), 2003, 18(4), 377-381. The increased pressure of gas provided from the score�on with nitrogen. The cell pressure was determined on a microbalance AH from Mettler Toledo and mass is determined, recordable on a personal computer using special software developed by the company Omya AG. Required device for capturing droplets at the base of the cell to direct the drops of penetrating fluid to release. An important practical feature of this method lies in the fact that the cell is below the location of the sample should be pre-moistened with liquid, so that every drop coming out of the sample into the vessel for sampling. Thanks to these measures, there is continuity of flow.

All the results obtained in the measurement of porosity, was amended by the software Pore-Comp to account for the effects of mercury and penetrometer and skeletal compression of the sample. With a detailed description of the method for measuring the porosity using mercury can be found in Gane et al. (Industrial & Engineering Chemistry Research Journal. 1996, 35(5), 1753-1764.

Table 1 presents the properties of the pigments used in the manufacture of the coating compositions described in table 2. P1 is a commercially available ground calcium carbonate, P2 is a commercially available modified calcium carbonate, R3 is a commercially available mixture� GCC and precipitated calcium carbonate.

The above pigments used for the manufacture of three different coating compositions (see table 2) to demonstrate the present invention. Composition A comprises a pigment P1, 11 mass. % styrolene-butadiene latex and 0.5 wt. % of carboxymethyl cellulose with respect to the pigment mass. Composition And represents a coating composition, which is commonly used for offset coating. Composition is a composition of the absorption layer according to the present invention includes the pigment P2, 3 mass. % of polyvinyl alcohol, 3 mass. % starch and 5 masses. % cationic additive as a release of the dye relative to the weight of the pigment. The composition is a composition of a surface coating according to the present invention includes a pigment P3, 5 mass. % styrolene-butadiene latex and 0.5 wt. % of carboxymethyl cellulose to the weight of the pigment, i.e., a composition very close to the offset of the composition And, for example, it has a negative charge. However, compared with the composition And the pigment used is different, and the reduced amount of binder.

Coating compositions A-C were applied to paper sheets Sappi Magnostar having a density of 58 g/m2the ISP�lsoa experimental device for coating on paper at a speed of 1500 m/min. To fabricate with double coating paper sheets containing absorption layer and a surface coating on a paper sheet coated with the composition was applied to the surface a coating composition C. the Coated paper sheet was subjected to calendering at 300 kN/m, to obtain a glossy surface. Table 3 presents made different types of glossy paper for testing.

The comparison of the gloss values measured for the investigated kinds of coated paper having a glossy surface, shown in Fig. 1. In this drawing you can see that the composition for inkjet printing results in significantly smaller values of gloss as compared with a composition for offset printing. In addition, you can see that the paper having the double coating b+C, reach the extremely high gloss values; therefore, these types of paper can successfully compete with the kind of glossy paper for offset printing.

In addition, evaluating the print quality by measuring optical density and inhomogeneity of color to black-and-white and color printing, and defined the mutual mixing of colors. The results are presented in table 4 and Fig. 2-7.

The results show that color printing on paper with offset� coating (coating composition A), leads to unacceptable image quality, as evidenced by the extremely high value of heterogeneity of staining (see Fig. 5, the composition (A). On the contrary, having a double coating paper according to the present invention provide excellent color printed image (see Fig. 6, composition b+C (8 g/m2and b+C (15 g/m2)).

Fig. 7 is a graph of mutual mixing of colors in the color ink jet printing with gloss paper according to the measurements of paper sheets containing various glossy coating compositions. As can be seen in Fig. 7, a typical inkjet coating (composition) greatly reduces possible gloss of the coating, but improves the value of the mutual mixing of colors. Anionic coating (compositions A, b+C (8 g/m2and b+C (15 g/m2)) and calendering at high pressure is able to provide very good gloss and absorption properties. However, typical coating for offset printing (composition A) is unacceptable mutual mixing of colors (value of more than 90 mm2as a rule, is unacceptable), and, thus, it is not suitable for inkjet printing.

1. Printed material, including:
a) a base layer having a first side and a reverse side;
(b) absorption layer, located � contact with the first side of the base layer, in this case, the absorption layer has an absorption rate of 1×10-5MS-0,5to 1×10-3MS-0,5and/or absorbed amount of from 30 to 95 vol.% in relation to the total volume of the absorption layer; and
(c) surface coating in contact with the absorption layer, wherein the surface coating has a permeability constituting more than 5.0×10-18m2, wherein the surface coating contains calcium carbonate.

2. The printed material according to claim 2, wherein the core layer is a paper without wood pulp or paper with a wood mass, preferably having a density of from 30 to 300 g/m2.

3. The printed material according to claim 1, wherein the absorption layer includes a pigment that, when it is in the form of a compacted layer has an absorption rate of 1×10-5MS-0,5to 1×10-3MS-0,5and/or absorbed amount of 35 to 95 vol.% in relation to the total volume of the pigment.

4. The printed material according to claim 3, wherein the pigment has a specific surface area equal to more than 25 m2/g, preferably from 25 to 100 m2/g or from 30 to 50 m2/g.

5. The printed material according to claim 3, in which the pigment when it is in the form of a compacted layer has a specific surface of more than 25 m2/g, the value of d50from 0.3 to 3 μm and a porosity of greater than or equal to 35%.

6. �ecatly material according to any one of claims. 3-5, in which the pigment is a calcium carbonate, plastic pigment, such as a plastic pigment on the basis of polystyrene, titanium dioxide, dolomite, calcined clay, or a mixture thereof, or in which the pigment is a mixture of calcium carbonate, titanium dioxide, dolomite, calcined clay, or mixtures thereof with one or more of such materials as talc, 'green' clay or bentonite, wherein said pigment is a preferably calcium carbonate, is preferable to the modified calcium carbonate and/or precipitated calcium carbonate.

7. The printed material according to any one of claims. 3-5, in which the calcium carbonate is acicular, prismatic, spherical or rhombohedral in shape or represents any combination of these forms.

8. The printed material according to any one of claims. 3-5, in which the absorptive layer further comprises a binder material, preferably in an amount of from 1 to 50 wt. % relative to the total weight of the pigment.

9. The printed material according to claim 8, in which the binder material is chosen starch, polyvinyl alcohol, styrolene-butadiene latex, styrolene-acrylate latex or polyvinyl acetate latex or a mixture thereof.

10. The printed material according to claim 1, wherein the absorption layer has a coating density in the range of 3 to 50 g/m preferably 3 to 40 g/m2and most preferably from 6 to 20 g/m2.

11. The printed material according to claim 1, wherein the surface coating includes a pigment having a value of d50in the range of from 0.01 to 1.0 μm.

12. The printed material according to claim 1, wherein the surface coating further comprises a binder material preferably in an amount of from 0.5 to 50 wt. % relative to the total weight of the pigment.

13. The printed material according to claim 1, wherein the binder material is chosen starch, polyvinyl alcohol, styrolene-butadiene latex, styrolene-acrylate latex or polyvinyl acetate latex or a mixture thereof.

14. The printed material according to claim 1, wherein the surface treatment further comprises a rheological modifier in the quantity constituting less than 1% by weight. % relative to the total weight of the pigment.

15. The printed material according to claim 1, wherein the surface coating has a coating density in the range of 1 to 50 g/m2preferably from 3 to 40 g/m2and most preferably from 6 to 20 g/m2.

16. The printed material according to claim 1, wherein the printed material further comprises a second absorption layer in contact with the back side of the base layer, and a second surface coating in contact with the second absorption layer.

17. SPO�about the manufacture of printed material, comprising the following stages:
(a) the manufacture of the base layer having a first side and a reverse side;
(b) applying a liquid coating composition for the formation of the absorption layer on the first side of the base layer;
c) applying the liquid coating composition on the absorption layer for the formation of surface coatings; and
(d) drying the absorption layer and the surface coating, wherein the absorption layer and the surface coating is dried at the same time, or absorption layer is dried after step (b) and before applying the surface treatment stage (C),
in this surface coating has a permeability constituting more than 5.0×10-18m2and contains calcium carbonate, and the absorption layer has an absorption rate of 1×10-5MS-0,5to 1×10-3MS-0,5and/or absorbed amount of from 30 to 95 vol.% in relation to the total volume of the absorption layer.

18. A method according to claim 17, in which stage (b) to(d) are also carried out on the reverse side of the base layer for the manufacture of printed material having a coating on the first side and the reverse side.

19. A method according to claim 17 or 18, in which the liquid coating composition used for formation of the absorption layer and/or surface coating has a solids content of 10 to 80 mass. % predpochtitel�but from 30 to 60 wt. % and preferably from 45 to 55 mass. % relative to the total weight of the composition.

20. A method according to claim 17 or 18, in which the liquid coating composition used for formation of the absorption layer further comprises a dispersant, preferably a polyacrylate in an amount of from 0.05 to 5 mass. % and preferably in an amount of from 0.5 to 5 wt. % relative to the total weight of the pigment.

21. A method according to claim 17 or 18, in which a coating composition is produced using the aqueous suspension of dispersed calcium carbonate having a solids content of from 10 wt. % to 82 mass. %, preferably from 50 wt. % to 81 mass. % and preferably from 70 mass. % to 78 mass. % relative to the total weight of the aqueous suspension of dispersed calcium carbonate.

22. A method according to claim 17 or 18, in which a coating composition having a viscosity in the range from 20 to 3,000 MPa·C, preferably from 250 to 3000 MPa·with and preferably 1000 to 2500 MPa·S.

23. A method according to claim 18 or 19, in which a coating composition is applied using a high-speed coating, metering press for bonding, glazed coating, spray coating or electrostatic coating, and preferably high-speed coating.



 

Same patents:

FIELD: chemistry.

SUBSTANCE: upper covering, suitable for printing or susceptible to printing, contains polyetherurethane, polyurethaneacrylate, cross-linking agent, where cross-linking agent is contained in amount from approximately 2 parts to approximately 15 parts per 100 parts of all solid substances and adhesion-preventive additive.

EFFECT: described is upper covering for front material, characterised by desired paint adhesion, resistance to formation of point defects, moisture/water resistance, optic characteristics and/or resistance to adhesion.

20 cl, 5 dwg, 7 tbl

FIELD: textiles, paper.

SUBSTANCE: invention relates to the pulp and paper industry and relates to the bases for printing with coating that provides improved printing quality and resolution capability at reduced consumption of ink. The product in the form of a paper substrate has on at least one of the first and second surfaces coating swelling under the influence of water, which thickness is less than 10 mcm. The base coating comprises some amount of pigment of coating, which is sufficient to impart at least one surface of the Parker surface evenness of about 4 and is dispersed in a binder matrix for the pigment of coating swelling under the influence of water, in a weight ratio of the coating pigment to the binder matrix of at least 2:1. The pigment of coating comprises larger porous coating pigment particles and smaller coating pigment particles in a weight ratio of at least 0.2:1. Coating of the base provides the porous surface receptive to ink.

EFFECT: invention provides enhanced printing quality and image resolution capability on paper base with coating on an inkjet printer at a reduced level of use of the ink.

57 cl, 4 dwg, 6 tbl, 3 ex

FIELD: printing.

SUBSTANCE: invention relates to a method of manufacturing a smooth or ultra-smooth sheet material for overprinting. It comprises the following steps: manufacturing a multilayer structure consisting of a lower layer of plastic film, an intermediate anti-adhesive layer, and also an outer layer for overprinting, gluing one side of the substrate or the upper side of the layer for overprinting, placement of the substrate on the layer for overprinting with their laminating followed by removal of the plastic film from the layer for overprinting, and this layer for overprinting forms on the sheet of smooth or ultra-smooth side.

EFFECT: invention provides creation of an ultra-smooth sheet material suitable for overprinting and suitable for complete recycling, when possible.

25 cl, 6 dwg, 8 ex

Information carrier // 2533821

FIELD: chemistry.

SUBSTANCE: invention relates to information carriers. Claimed is an information carrier, successively including a substrate, selected from a polymer-covered paper, synthetic paper and plastic films, the first ink-receiving layer and the second ink-receiving layer, with the ink-receiving layer containing at least one substance, selected from aluminium oxide, aluminium oxide hydrate and highly dispersive silicon oxide, polyvinyl alcohol and boric acid, with a weight ratio of the boric acid and polyvinyl alcohol content in the first ink-receiving layer constituting 2.0 wt % or more and 7.9 wt % or less, with the second ink-receiving layer containing highly-dispersive silicon dioxide, polyvinyl alcohol and boric acid, and a weight ratio of the boric acid and polyvinyl alcohol content in the second ink-receiving layer constitutes 10.0 wt % or more and 30.0 wt % or less.

EFFECT: claimed carrier makes it possible to prevent cracking after the application of ink-receiving layers, possesses the high ink-absorbing ability and a resistance to cracking in bending.

6 cl, 4 tbl, 68 ex

Data storage device // 2532419

FIELD: printing.

SUBSTANCE: data storage device comprises a substrate and at least one ink receiving layer. The first ink receiving layer, which represents at least one ink receiving layer, comprises inorganic particles having an average primary particle size of 1 mcm or less, and the inorganic particles coated with the metal oxide. The inorganic particles covered with the metal oxide have an average primary particle size of 15.0 mcm or more. When the maximum value of the FLOP data storage device is represented as FLOPMax and the minimum value of FLOP is represented as FLOPMin, the FLOPMin is 2.5 or more and the value FLOPMin/FLOPMax is 0.80 or more and 1.00 or less.

EFFECT: proposed data storage device has a high degree of pearl lustre.

8 cl, 2 dwg, 3 tbl

FIELD: printing.

SUBSTANCE: reversible thermosensitive medium for printing, comprising a base, a reversible thermosensitive layer for printing, provided on the base, and the antistatic layer, at that the antistatic layer is provided on at least a the reversible thermosensitive layer for printing or the substrate surface opposite to its surface on which the reversible thermosensitive layer for printing is provided, the antistatic layer comprises spherical fillers and a curable electroconductive polymer, and the spherical fillers satisfy the following expression (1): 4 ≤ the average diameter of particles of the spherical fillers/thickness of the antistatic layer ≤ 6… (1).

EFFECT: invention has improved antistatic properties.

12 cl, 15 dwg

Tool marking // 2530908

FIELD: process engineering.

SUBSTANCE: invention relates to method of tools marking. This method comprises provision of tool, its thermal treatment, provision of tool primer ply, printing on tool and application of electrolytic coat thereon. For printing of pattern at primer ply, a layer of dye is used. Layer of dye includes at least one ID element. Said ID element includes at least one ID zone with dye, background section around ID zone with no dye, and boundary line located around background section with dye. Electrolytic coating is applied to section without ID zone and boundary line. Note here that there a sharp contrast between coating and dye ply.

EFFECT: clear and stable mark.

14 cl, 11 dwg

Recording medium // 2526007

FIELD: physics, computer engineering.

SUBSTANCE: recording medium successively includes a substrate, a first ink-receiving layer and a second ink-receiving layer, wherein content of boric acid in the first ink-receiving layer is 2.0 wt % or more and 7.0 wt % or less with respect to content of polyvinyl alcohol in the first ink-receiving layer, and content of boric acid in the second ink-receiving layer is 10.0 wt % or more and 30.0 wt % or less with respect to content of polyvinyl alcohol in the second ink-receiving layer; the outermost surface layer of the recording medium has particle content of 0.5 wt % or more and 5.0 wt % or less with respect to content of an inorganic pigment, said particles having secondary particle average size of 1.0 mcm or more and 20.0 mcm or less.

EFFECT: disclosed recording medium reduces cracking when bent.

5 cl, 6 tbl

FIELD: chemistry.

SUBSTANCE: method of instrument marking includes formation of an instrument 10, performing a depressed marking 15 in the instrument 10, quenching of the instrument 10, coloration of the instrument 10 in order to create a colour layer 20 on the instrument 10 in the depressed marking 15 and near it, cleaning the instrument 10 from excess of the colorant, overflowing the depressed marking 15, coloration of the instrument 10 into black colour to create a coloured black layer 40 on the instrument 10, except for the depressed marking 15, and painting the instrument 10 to form a transparent layer of paint 50 on the instrument to create luster and prevent rust.

EFFECT: marking is clear, and the applied coating protects the instrument from rust.

9 cl, 8 dwg

FIELD: printing.

SUBSTANCE: present invention relates to a sheet for printing having improved drying time of the image. The sheet for printing comprises a substrate comprising lignocellulosic fibres, and at least 0.02 g/m2 of a water soluble divalent metal salt which is applied by a gluing press. The test value of gluing Hercules ("HST") of the substrate is about from 3 seconds to 300 seconds. The HST value and the amount of divalent metal salt is selected so that the sheet for printing has a percentage of ink transfer ("IT%") equal or less than about 60.

EFFECT: proposed sheet for printing provides improved drying time of the image.

27 cl, 6 dwg, 10 tbl, 4 ex

FIELD: paper-and-pulp industry.

SUBSTANCE: when ground paper is manufactured, it is coated with ink-accepting coating. The latter contains latex binder, water-soluble binder, pigment mixture of amorphous silica with colloidal cationic silica and colloidal alumina, and ink-fixing agent. Coating operation is performed in two steps, weight ratio of coating applied in the first step to that in the second step ranging from 0.34:1 to 0.66:1. Reverse face of base paper is coated by detwisting coating. Further, coating is ennobled via superglazing at pressure in supercalender roll gap 30-75 bar.

EFFECT: improved workability of process and improved quality of paper due to increased surface strength.

4 cl, 7 ex

FIELD: polygraphy.

SUBSTANCE: one invention from a group is related to printing base, being a substrate with oleophilic surface, having Gurley-Hill porosity value greater than 5000s/100ml, while printing paint, imprinted on such base, has offset value of printing paint IGT with delay time 30s, equal to more than 0,60 printing density units. Another invention is related to printing method, which is performed in at least one printing section with use of substrate, having oleophilic surface and being not porous with Gurley-Hill porosity value over 5000s/100ml, and carrier of pigment of printing paint, having value of offset of printing paint IGT with delay time 30s, equal to more than 0,60 printing density units.

EFFECT: improved quality of printing, improved quality of folding, decreased static electricity.

2 cl, 6 dwg, 3 tbl

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: 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: 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: 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: 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: 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

FIELD: polygraphy.

SUBSTANCE: invention relates to water-based printing dye used in the set of reaction liquid with water-based printing dye for image formation. The water-based printing dye is proposed making a part of the system using a reaction liquid including, at least, a polyvalent metal and water-based printing dye comprising, at least a pigment dispersion wherein the pigment is dispersed in anionic polymer disperser. Here note that the water-based printing dye meets the specified requirements.

EFFECT: production of a stable jet printing irrespective of the printing conditions, formation of uniform image with a high resistance to deterioration, clear image even in two-side printing, high-quality image sharpness.

18 cl, 1 tbl, 10 ex

FIELD: polygraphy.

SUBSTANCE: invention relates to water-based printing dye used in the set of reaction liquid with water-based printing dye for image formation. The water-based printing dye is proposed making a part of the system using a reaction liquid including, at least, a polyvalent metal and water-based printing dye comprising, at least a pigment dispersion wherein the pigment is dispersed in anionic polymer disperser. Here note that the water-based printing dye meets the specified requirements.

EFFECT: production of a stable jet printing irrespective of the printing conditions, formation of uniform image with a high resistance to deterioration, clear image even in two-side printing, high-quality image sharpness.

18 cl, 1 tbl, 10 ex

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