KR20020071014A - Method for improving printability and coatability of paper and board - Google Patents

Abstract

The invention concerns a method for improving the printability and coatability of calendered paper and board. The method suggests the addition of polysaccharide and further, as hydrophobic agent, at least a dispersed polymer which contains hydrophobic monomers, to the fiber stock in the production of the paper and board.

Description

METHOD FOR IMPROVING PRINTABILITY AND COATABILITY OF PAPER AND BOARD}

The present invention relates to a method for improving the printability and coating properties of paper in connection with the production of paper.

1 shows moisture permeability over time on glossy paper made in accordance with Example 4. FIG.

First of all, the method has a smoothness and glossiness which is very suitable for printing by either machine finished (MF) or super-calendered (SC) after calendering. It aims at producing the paper which has.

The invention also relates to glossy, in particular high-gloss papers, and the use of paper for gravure printing as well as off-set printing. In particular, the method produces paper having not only the properties required for off-set printing, but also properties that are very suitable for gravure printing.

The present invention also relates to a composition suitable for the production of such paper.

The term " paper " is used herein to mean paper and cardboard produced using fibers obtained from a fiberizing method of retaining lignin. Examples of this fiber type include groundwood (GW), pressure groundwood (PGW), refiner groundwood and thermo-mechanical pulp (TMP). The present invention is also applicable to paper production processes in which chemically treated fibers are used. Such fibers include chemi-thermo-mechanical pulp (CTMP) as well as sulfate and sulfite pulp. In addition, the fibers can only be processed under mild chemical conditions to soften lignin moieties such as NSSC-fibers and the like. The present invention may also be accomplished using regenerated fibers, including de-inked fibers (DIP). The present invention can work with both bleached and unbleached fibers.

In general, the above types of fibers and mixtures thereof containing high proportions of lignin are widely used for several printing paper grades. One example is magazine paper.

High-gloss (SC) magazine papers generally contain about 75% lignin-rich fibers, such as bleached wood. Unbleached sulfite fibers or semi-bleached sulfate fibers are used as reinforcing fibers. In addition, some of the lignin-rich fibers consist of thermo-mechanical refined fibers, which can reduce the amount of reinforcing fibers. Such paper may contain a filler material in an amount of 12 to 30%. Filling materials promote the achievement of good smoothness and glossiness in high-gloss paper. The filler material may consist of kaolin, calcined kaolin, aluminosilicate, talc, earth-based and precipitated calcium carbonate (PCC), and mixtures of these materials. An advantageous paper production method according to the invention comprises a filling material, preferably in an amount of more than 5%, more preferably in an amount of more than 10%, even more preferably in an amount of more than 15%, most preferably 20 It entails using in quantities greater than%.

A typical newsprint furnish consists of a fiber mixture with about 10 to 20% chemical pulp fractions, with the remainder of the fibers being predominantly ground wood (GW), compressed wood (PGW), refined wood or thermo-mechanical pulp. It is composed of mechanical pulp such as (TMP). In addition, de-inked waste paper (DIP) is also used as part of the finished paper. The waste paper replaces the mechanical pulp portion.

Finishes for light-weight coated papers (LWC) contain reinforcing fibers at a high rate of up to 50%, with the remainder consisting of lignin-rich thermo-mechanical pulp or lumber. Fibers produced by various methods are photobleached, lignin rich fibers using known lignin maintenance methods, and chemical pulp using a semi-bleaching method. The use of filler materials in the production of paper of this grade is not common. Another exception in this case is the use of de-ink pulp which generally involves unavoidable filling materials which have their own effects on the proper properties.

The paper disclosed in the present application undergoes at least mechanical finishing, preferably high-gloss, most preferably producing paper of the same or higher quality as high-gloss, including substrata molding. Finished using the latest varnish treatment.

The higher the percentage of fibers with high lignin in the paper, the lower the strength of the paper. This problem is caused by the so-called stock starch, or non-destructive chain structure, in the paper at the production stage where the fibers still form a stock. Starch having a generally corresponds by adding at least 5 kg / ton. The starch generally has slightly modified cationic, anionic or amphoteric electro-chemical properties that are achieved by binding a compound that results in cationic, anionic or positive properties to the OH-group in the starch monomer structure. The degree of substitution (DS) can be from 0.01 to 1, generally lower than 0.1, so that the starch chains remain unbroken. The use of suitable stock starches improves the strength of the paper required for example for printing and coating the paper. The amount of starch used to obtain the high paper strength may be up to 15 kg / ton. In particular, paper produced for off-set printing is produced using a high proportion of stock starch to achieve the required strength and adequate liquid permeability. The amount of starch applied is typically greater than 3 kg per tonne of fiber.

However, the high starch rate in the paper changes the properties of the paper and limits the usefulness of the paper. High starch ratios make paper hard and rigid, reducing compressibility. This has an adverse effect on the workability of the paper surface in gloss processing. In addition, the paper is less suitable for gravure printing, which presupposes a certain degree of compressibility as well as high smoothness with excellent printing characteristics. Paper made for application to off-set printing has a fiber finish composition suitable for use in gravure printing as well, but the properties resulting from the use of starch prevent the use of paper for this purpose. In the production of paper suitable for gravure printing, the amount of stock starch added is generally less than 1.5 kg per ton of fiber.

It is also known to use highly thinned cationic starches as retention aids for hydrophobic size-dispersions such as AKD and protective colloids. However, this method does not produce strength and compressibility which are characteristic properties of the paper produced by the method of the present invention.

A problem with papers that are typically produced through a manufacturing process involving the use of polysaccharide based sizes such as starch for internal sizing, and produced from fibers with a high lignin ratio, In the present invention, the fiber stock is removed by adding not only polysaccharides, but also at least one dispersion polymer containing a hydrophobic monomer as a hydrophobic enhancer.

The novel composition according to the invention which is applied to the production of glossy and high-gloss paper grades suitable for both off-set printing and gravure printing comprises the aforementioned polysaccharides and polymer dispersions.

The film formation temperature of a polymer becomes like this. Preferably it is -50 degreeC-200 degreeC, More preferably, it is -25 degreeC-100 degreeC, Most preferably, it is 0 degreeC-80 degreeC. Using such polymers in addition to polysaccharides or replacing portions of polysaccharides with such polymers results in reduced stiffness and improved gloss behavior of the paper, resulting in paper strength ( It is possible to achieve higher smoothness in glossy paper without changing the strength characteristic. This generally has an advantageous effect on paper printability. It is possible to produce paper suitable for off-set printing, and the additional elasticity improvement makes the paper also suitable for gravure printing.

Applicable compounds in the preparation of the polymer dispersions include vinyl acetate, butyl- and / or 2-ethylhexyl acrylate, methylmethacrylate, acrylonitrile, styrene, alpha-methylstyrene and / or butadiene. In addition, in preparing dispersions, polymerizable anionic and / or cationic monomers such as different acids, amines and amides may be used. Examples thereof include acrylic acid, methacrylic acid, and acryl amide.

The polymer dispersion is preferably composed of acrylate, styrene acrylate, or styrenebutadiene copolymers. Preferably, the polymer dispersion is produced using emulsion polymerisation techniques performed in aqueous solution. Such production techniques are disclosed, for example, in Peter A. Lovell and Mohamed S. El-Aasser, Emulsion Polymerization and Emulsion Polymers, John Wiley and Sons, pages 37-58.

In the preparation of the polymer dispersion, starch, mannan, carboxymethylcellulose, polyvinylacetate and / or emulgators can be used as stabilizers, preferably cationic and / or oxidized starch. Used as a topic. The preparation of polymer dispersions using starch as stabilizers is disclosed, for example, in WO 00/46264.

According to the invention, the polymer dispersion can be added in an amount of 0.5 to 20 kg per tonne of fiber, calculated on the basis of the dry matter of the dispersion and the total dryness of the fiber composition. The preferred amount of addition is 0.5 to 10 kg per tonne of fiber, more preferably 0.5 to 5 kg per tonne of fiber.

In one application of the invention, the polysaccharide is a cationic or cationic natural starch, mannan or carboxymethyl cellulose (CMC) having a degree of substitution (DS) of 0 to 2 of the anionic and / or cationic groups in the polysaccharide chain. May be). The polysaccharide has a degree of substitution (DS) of the cationic group in the starch chain of 0 to 1, preferably 0.01 to 0.4, more preferably 0.01 to 0.2, still more preferably 0.01 to 0.1, most preferably 0.01 to It is preferable that it is cationic starch which is 0.05. The viscosity of the polysaccharide is greater than 5 mPas (5%, 60 ° C., Brookfield), preferably greater than 100 mPas, more preferably greater than 300 mPas, most preferably greater than 400 mPas. It is most preferred that the polysaccharide has a low cation substitution (DS of 0.01 to 0.05) without substantial thinning (viscosity greater than 400 mPas). In the process of the invention, the polysaccharide can be from about 0.1 to 15 kg / ton, even 0.1 to 20 kg / ton (fiber) per ton of fiber, preferably 0.5 to 6 kg / ton (fiber) ), More preferably 1.5 to 5 kg / ton (fiber), most preferably 2 to 5 kg / ton (fiber).

When using a polymer dispersion stabilized with synthetic polymers or ionic monomers, the degree of substitution of cationic groups as polysaccharides is 0 to 2, preferably 0.02 to 1, more preferably 0.03 to 0.7, more preferably 0.05 Preference is given to using cationic starches which are from 0.5 to 0.5, most preferably from 0.1 to 0.4. The viscosity of the polysaccharide is preferably greater than 5 mPas (5%, 60 ° C., Brookfiled), more preferably 50 to 2000 mPas, most preferably 100 to 500 mPas. Most preferred polysaccharides in this embodiment are starch, mannan or carboxymethylcellulose (CMC), which have a relatively high degree of cationic substitution (0.1 to 0.4 DS) and are partially diluted (viscosity of 100 to 500 mPas) , Especially starch. In the use of the present invention, the amount of such polysaccharides added is in the range of 0.1 to 4 kg per tonne of fiber, preferably 0.1 to 3 kg per tonne of fiber.

In addition, in the practice of the present invention, the range of addition of polysaccharides having the following degree of substitution is as follows:

Cationic Polysaccharide, DS Minimum Additive, kg / ton (fiber)

0.01 to 0.05 2

0,05 to 0.3 1

0.3 to 1 0.5

It is also advantageous to use two or more different polysaccharides, such that the amount added follows this amount.

The polymer dispersions and polysaccharides can be added separately, but at the same time it is preferred to add them on the paper machine together as a finished mixture or simultaneously from the same point of addition. Most preferably, the finished mixture is used.

In addition, the amount of polysaccharide may be divided into several portions, one portion may be added with the polymer dispersion or added in the form of a mixture with the polymer dispersion. By simultaneously adding the polymer dispersion and the polysaccharide, the mixing is good, and as a result, a paper having uniform physical properties is produced. This simultaneous addition also improves the effect of the polymer dispersion and also improves the smoothness of the paper.

In the practice of the present invention, the hydrophobicity of the paper can be increased by adding several other hydrophobic agents in addition to the polymer dispersion to the fiber stock. It is preferred to add at the same time, ie from the same time of addition or as a finished mixture. For example, ASA, AKD or rosin size can be used as such hydrophobic agent.

The invention will be explained in more detail by the following examples.

Example 1

Paper (50 g / m ² ) was produced using 100% hydrogen peroxide bleaching thermo-mechanical pulp (TMP) with a dewatering degree of 70 ° SR. Anionic calcium carbonate as filler material was additionally added to the fiber stock in an amount of 10% relative to the total fiber composition. The fiber stock was mixed with 0.2% of cationic starch having a cation substitution degree (DS) of 0.2 at each test time point. At test points 1, 2, 5 and 6, the fiber suspension was further mixed with stock starch having a degree of cation substitution of 0.032 of 0.2 or 0.4% for the fiber composition. Percol 162 and Hydrocol O were used in amounts of 0.02% and 0.17%, respectively, as retention aids. Styrene-acrylnitrile-bytyl-acrylate containing cationic starch having a degree of substitution of 0.2 to the cationic group as a dispersion stabilizer in an amount of 20% of the dry weight of the dispersion. copolymer). The polymer dispersion was added simultaneously with the starch in the form of a mixture. The ratio of each added compound was calculated as the dry amount of the compound relative to the total dry amount of the fiber composition. The paper was subjected to mechanical finishing (MF) by polishing.

Test Point Polymer Dispersion Added,% Added amount of starch (DS 0.035),% Geometric Tensile Index, Nm / g Geometric Hardness Index, Nm / g Scott Bond, J / m ² Porosity, Bedtsen, ml / min One 0 0.2 30.7 4.07 268 118 2 0 0.4 32.6 4.83 306 117 3 0.4 31.9 4.36 220 93 4 0.8 35.8 4.66 230 107 5 0.4 0.2 32.1 4.00 313 102 6 0.8 0.2 33.0 4.01 376 97

The test results show that by using polymer dispersions, more flexible papers can be produced with improved strength similar to that of starch. In particular, by using a mixture of starch and polymer dispersion, it is possible to achieve the lowest paper hardness advantageous for gravure printing and the maximum internal bond strength advantageous for off-set printing. In addition, the use of polymer dispersions has an advantageous effect on the porosity of the paper. More dense paper prevents the coating color from penetrating the paper finish, thereby improving the coatability of the paper.

Contrary to the previous example, a corresponding conclusion can be drawn based on the following example 2, where the polymer dispersion is stabilized by the synthetic polymer. From the test results, it can be seen that when the polymer dispersion is used, not only the hardness of the gloss paper but also the porosity and roughness are lower. In addition, the use of polymer dispersions has an advantageous effect on the internal bonding and tensile strength of the paper.

Example 2

Paper (50 g / m ² ) was produced using 100% hydrogen peroxide bleaching thermo-mechanical pulp (TMP) with a dehydration degree of 70 ° SR. The fiber stock was further mixed with 0.2% or 0.4% stock starch with a cation substitution degree (DS) of 0.20 and 0.02% and 0.17% of Percol 162 and Hydrocol O, respectively, as retention aids. Styrene-acrylonitrile-butylacrylate-trimethylammonium-propyl-methacryl-amide chloride containing fat-alcoholetoxylate as a stabilizer ) Copolymer was used as the polymer dispersion. The polymer dispersion was added as a mixture with the cationic stock starch. The paper was polished to give a finish corresponding to mechanical finishing (MF).

Amount of polymer dispersion,% Amount of stock starch,% Geometric Longevity Index, Nm / g Scott Bond, J / m ² Porosity, Ventsen ml / min Illuminance, -Ventsen ml / min Hardness index 0.4 0.2 31.9 211 223 303 4.23 0.8 0.2 32.7 226 183 253 3.95 0.8 0.4 33.0 221 279 290 4.26 0.4 29.3 188 299 315 4.30

Example 3

Paper (60 g / m ² ) was produced using 30% fine kraft pulp with a dehydration degree of 70 ° SR and 70% thermo-mechanical pulp (TMP) bleached with dithionite. 30% amount of anionic kaolin, 0.5% amount of cationic substitution DS = 0.035 (Raisamyl 135) as a filler in the paper stock and 0.02% of Percol as a retention aid 162 was further added. As a polymer dispersion, a styreneacrylonitrile-butylacrylate copolymer containing cationic starch substituted with a cationic group with a substitution degree of 0,2 in an amount of 35% relative to the total amount of dry dispersion was used as a stabilizer. The amount of each compound added was calculated from the amount of dry compound to the amount of dry fiber composition. The paper was finished with high gloss (SC), and porosity, smoothness and surface strength values were measured to obtain the following values.

Amount of stock starch,% Amount of polymer dispersion,% Porosity, PPS10, kPam ² Smoothness, PPS10, kPam ² Scott Bond J / m ² 0.5 0.169 1.15 180 1.0 0.171 1.18 263 1.0 0.3 0.108 1.13 397 0.5 0.6 0.009 1.11 271

The results show that the polymer dispersion essentially improves the porosity and smoothness, which are advantageous properties for gravure printing in glossy papers.

The mass use of stock starch in this embodiment (10 kg / ton) is intended to give the paper the highest internal bond strength that can be achieved by stock starch. The addition of the polymer dispersion further improves the internal strength value, which means that not only starch, but also when the polymer dispersion is added to the fiber stock, the previous strength level can be reached, even though a small amount of stock starch is added. . Therefore, the paper produced is also suitable for gravure printing.

Example 4

Hydrogen peroxide bleached thermo-mechanical pulp (TMP) was used to produce paper (40 g / m ² ). In addition, not only 0.04% and 0.15% of Percol 162 and Hydrocol O were used as retention aids, but also stock starch 0.05 with anionic calcium carbonate 10% and cation substitution degree DS 0.35 for the total fiber composition as the filler material. It was. As the dispersion stabilizer, a styrene-acrylonitrile-butylacrylate copolymer containing starch having a degree of substitution of 0.2 with respect to the cationic group in an amount of 35% of the dry weight of the dispersion was used as the polymer dispersion. The amount of each compound added was calculated as the amount of dry of each compound based on the total amount of dry fiber composition. Mechanical finishing (MF) was performed by polishing the paper. Print tests were performed using the Prufbau-laboratory apparatus.

Amount of polymer dispersion,% Amount of color at density 0.8 g / m ² Amount of color at density 1.0 Density at the color amount of 0.8g / m ² Density at the color amount of 1.0g / m ² Geometric tensile strength index 0 0.94 1.37 0.73 0.82 11.16 0.1 0.88 1.36 0.76 0.87 11.33 0.3 0.86 1.3 0.77 0.88 12.74

The results in the table above show that when a polymer dispersion as well as starch is added, a certain density level of print quality is achieved using a smaller amount of color, and correspondingly, using a predetermined amount of color, the polymer dispersion It shows that better print quality can be obtained than when using glossy paper produced without adding. In addition, when a polymer dispersion is used, it has a higher tensile strength value, which is advantageous for glossy paper used for printing.

Glossiness of the print surface

Amount of polymer dispersion,% Glossiness at color amount 1.0 g / m ² ,% Glossiness at color amount 1.5 g / m ² ,% Glossiness at color amount 2.0 g / m ² ,% 0 14.7 16.2 18.5 0.1 16.7 17.8 19.8 0.3 16.2 18.7 22

The use of polymer dispersions for internal sizing always results in a higher gloss on paper than when only starch is used for internal sizing.

The accompanying drawings show the moisture permeability over time on the gloss treated paper produced according to Example 4. FIG. Moisture permeability was measured using a DPM (dynamic penetration meter) instrument. It can be concluded that the polymer dispersion reduces the rate of water penetration, which is advantageous for both printing and coating glossy paper. The advantage of printing these paper characteristics is the magazine "The Future Demand for Printing Paper" IPW, No. 5/99, pages 72-74.

Paper according to the invention prepared using the above-described polymer dispersions containing polysaccharides having a degree of charge substitution for compounds in the range of 0.01 to 1.2 and additionally cationic hydrophobic monomers is particularly suitable for use in gravure printing. Proved. By carrying out the present invention, it is possible to increase the proportion of polysaccharides in the paper to be suitable for gravure printing, without a negative effect on the paper properties such as the compressibility required from the paper suitable for gravure printing. Paper suitable for gravure printing has a polysaccharide ratio of higher than 1.5 kg per ton of fiber, preferably higher than 2 kg / ton (fiber), more preferably higher than 2.5 kg / ton (fiber), and even more preferred. Preferably higher than 3 kg / ton (fiber), even more preferably higher than 3.5 kg / ton (fiber), even more preferably higher than 4 kg / ton (fiber), most preferably 5 kg / ton Higher than (fiber) and even higher than 8 kg / ton (fiber).

Paper used for gravure printing generally has a polysaccharide ratio necessarily in the range of 0.1 to 20 kg per ton of fiber, preferably 0.5 to 10 kg / ton (fiber), most preferably 1 to 5 kg / ton (Fiber). For certain applications it is desirable to use at least 3.7 kg / ton (fibers).

The degree of substitution of charge for a compound is related to the amount used within the following range:

Degree of substitution, DS usage, kg / ton (fiber) Preferred usage, kg / ton (fiber)

0.01 to 0.052 to 153 to 8

0.06 to 0.29 1 to 121.5 to 7

0.3 to 0.70.1 to 40.5 to 3

0.71 to 1.20.1 to 30.5 to 1.5

Claims (44)

In the production of paper or cardboard, polysaccharides and, in addition, as hydrophobic agents, dispersion polymers containing at least hydrophobic monomers are added to the fiber stock, especially glossy papers and cardboard, such as high-gloss paper. Or, a method of improving the printability of paper processed in a similar manner and at least partially produced from lignin containing fibers. The method of claim 1, wherein at least a portion of the polysaccharide is added as a mixture or simultaneously with the hydrophobic polymer dispersion at the same time of addition. 2. The method of claim 1, wherein cationic, nonionic and / or anionic starch is added to the fiber stock as a polysaccharide. 4. The process according to claim 3, wherein as polysaccharide, a cationic starch having a degree of substitution of 0.02 to 2 in the starch chain is added to the fiber raw material. 4. The process according to claim 3, wherein cationic starch having a degree of substitution of 0.02 to 0.4 in the starch chain as polysaccharide is added to the fiber stock. 2. The method of claim 1, wherein cationic, nonionic and / or anionic manna is added to the fiber stock as a polysaccharide. 7. The process according to claim 6, wherein as the polysaccharide, a cationic mannan having a degree of substitution of 0.02 to 2 in the mannam chain is added to the fiber raw material. Process according to claim 1, characterized in that a polymer dispersion made using styrene, butadiene, vinyl-acetate, acryl-nitrile, and / or acrylate, preferably styrene, butadiene and / or acrylate is used. . 2. The method of claim 1, wherein a polymer dispersion is drawn that uses cationic, nonionic and / or anionic polymers and / or monomers. The method of claim 1, wherein a polymer dispersion made using cationic, nonionic and / or anionic polysaccharides is used. The method of claim 10, wherein a polymer dispersion made using cationic, nonionic and / or anionic starch is used. The method of claim 10, wherein a polymer dispersion prepared using cationic, nonionic and / or anionic mannanes is used. The method of claim 1, wherein a polymer dispersion made using one or more vinyl monomers is used. The method of claim 1, wherein a polymer dispersion made by emulsion polymerization is used. The method according to any one of the preceding claims, characterized in that the polymer dispersion is used in an amount of 0.5 to 20 kg per ton of paper, calculated from the dryness of the dispersion and the dryness of the total fiber composition. 16. The method of claim 15, wherein the polymer dispersion is used in an amount of 0.5 to 10 kg per ton of paper, calculated from the amount of dry dispersion and the total amount of dry fiber composition. 16. The method of claim 15, wherein the polymer dispersion is used in an amount of 0.5 to 5 kg per ton of paper, calculated from the amount of dry dispersion and the total amount of dry fiber composition. The method according to any one of the preceding claims, characterized in using a fiber composition consisting of lignin-containing fibers, chemically treated fibers or de-inked fibers or a mixture of said fiber types in the manufacture of the paper. The method according to any one of the preceding claims, characterized in that the filler material is used in the manufacture of the paper in an amount greater than 5%, calculated as the dryness to the total dryness of the fiber composition. The method according to any one of the preceding claims, characterized in that the filler material is used in the manufacture of the paper in an amount greater than 10%, calculated as the dryness to the total dryness of the fiber composition. The method according to any one of the preceding claims, characterized in that the filling material is used in the production of paper in an amount greater than 15%, calculated as the dryness to the total dryness of the fiber composition. The method according to any one of the preceding claims, characterized in that the filler material is used in the manufacture of the paper in an amount greater than 20%, calculated as the dryness to the total dryness of the fiber composition. The method of claim 1, wherein additional hydrophobic agent is added to the fiber stock in addition to the polymer dispersion. 24. The method of claim 23, wherein the alkenyl-succinic acid is used as an additional hydrophobic agent. 24. The method of claim 23, wherein the rosin size is added as an additional hydrophobic agent. 24. The method of claim 23, wherein the alkyl-ketene-dimer is added as additional hydrophobic agent. 27. The method of any of claims 1 to 26, wherein the polysaccharide is added to the fiber stock in an amount of 0.1 to 20 kg per tonne of fiber. 28. The method of claim 27, wherein the polysaccharide is added to the fiber stock in an amount of 0.1 to 15 kg per tonne of fiber. 28. The method of claim 27, wherein the polysaccharide is added to the fiber stock in an amount of 0.5 to 6 kg per tonne of fiber. 28. The method of claim 27, wherein the polysaccharide is added to the fiber stock in an amount of 0.1 to 3 kg per ton of fiber. 28. The method of claim 27, wherein the polysaccharide is added to the fiber stock in an amount greater than 1.5 kg per tonne of fiber. Glossy or high-gloss paper or cardboard produced according to the method of any one of the preceding claims. 33. A paper or paperboard as claimed in claim 32 for off-set and gravure printing. A polysaccharide and, in addition, a hydrophobic agent, characterized in that it comprises at least one dispersion polymer containing a hydrophobic monomer, a mixture added to the fiber raw material in connection with the production of paper. 35. The mixture of claim 34, wherein the polysaccharide is substantially free of thinning and has a viscosity of greater than 400 mPas and a low cation substitution degree (DS) of 0.01 to 0.05. Use in the preparation of lignin-containing papers suitable for off-set and gravure printing, in particular gravure printing, of polysaccharides and, in addition, as a hydrophobic agent, at least one dispersion polymer containing hydrophobic monomers. Use of a dispersion polymer containing a polysaccharide and a hydrophobic monomer added together to a fiber raw material in the manufacture of paper suitable for gravure printing. 38. The use of claim 37, wherein the dispersing polymer containing polysaccharide and hydrophobic monomer is added simultaneously. 39. The use according to claim 38, wherein the dispersed polymer containing polysaccharide and hydrophobic monomer is added in the form of a mixture. 40. The use of any one of the preceding claims 37-39, wherein the dispersed polymer is added to the fiber stock in an amount of 0.1 to 20 kg per ton of fiber. 41. The use according to any one of the preceding claims 37 wherein the dispersing polymer is added to the fiber stock in an amount of 0.5 to 20 kg per tonne of fiber. 42. The use of any one of the preceding claims 37-41, wherein the polysaccharide added to the fiber has a degree of substitution of 0.01 to 1.2 of charge relative to the compound. 43. The use according to any one of the preceding claims 37 to 42, wherein the polysaccharide added to the fiber stock has a degree of substitution of charge of 0.01 to 0.05 for the compound without substantially undergoing dilution treatment. A polysaccharide and additionally, as a hydrophobic agent, at least one dispersion polymer containing a hydrophobic monomer. For gravure printing of paper treated with a gloss or similar method.