Method for improving printability and coatabililty of paper and board

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.

1 . A method for improving the printability of calendered paper and board, especially of super-calendered paper, or treated with a similar manner and produced at least partly from lignin containing fiber, characterized in that a polysaccharide and further, as a hydrophobic agent, at least a dispersed polymer which contains hydrophobic monomers are added to the fiber stock in the production of the paper or board.  
     
     
         2 . The method according to  claim 1 , characterized in that at least a part of the polysaccharide is added simultaneously with the hydrophobic polymer dispersion either as an admixture or at the same addition point.  
     
     
         3 . The method according to  claim 1 , characterized in that a cationic, nonionic and/or anionic starch is added as the polysaccharide to the fiber stock.  
     
     
         4 . The method according to  claim 3 , characterized in that a cationic starch having a degree of substitution of 0.02 to 2 in the starch chain is added as the polysaccharide to the fiber stock.  
     
     
         5 . The method according to  claim 3 , characterized in that a cationic starch having a degree of substitution of 0.02 to 0.4 in the starch chain is added as the polysaccharide to the fiber stock.  
     
     
         6 . The method according to  claim 1 , characterized in that cationic, nonionic and/or anionic mannan is added as the polysaccharide to the fiber stock.  
     
     
         7 . The method according to claims  6 , characterized in that cationic mannan having a degree of substitution of 0.02 to 2 in the mannan chain is added as the polysaccharide to the fiber stock.  
     
     
         8 . The method according to  claim 1 , characterized in that a polymer dispersion is used, in the production of which styrene, butadiene, vinyl-acetate, acryl-nitrile, and/or acrylates, preferably styrene, butadiene and/or acrylates have been used.  
     
     
         9 . The method according to  claim 1 , characterized in that a polymer dispersion is used, in the production of which cationic, nonionic and/or anionic polymers and/or monomers have been used.  
     
     
         10 . The method according to  claim 1 , characterized in that a polymer dispersion is used, in the production of which a cationic, nonionic, and/or anionic polysaccharide has been used.  
     
     
         11 . The method according to  claim 10 , characterized in that a polymer dispersion is used, in the production of which a cationic, nonionic and/or anionic starch has been used.  
     
     
         12 . The method according to  claim 10 , characterized in that a polymer dispersion is used, in the production of which cationic, nonionic and/or anionic mannan has been used.  
     
     
         13 . The method according to  claim 1 , characterized in that a polymer dispersion is used, in the production of which at least one vinyl monomer has been used.  
     
     
         14 . The method according to  claim 1 , characterized in that a polymer dispersion is used which has been produced with emulsion polymerisation.  
     
     
         15 . The method according to any of the preceding claims, characterized in that the polymer dispersion is used in an amount of 0.5 to 20 kg/ton of paper calculated as the dispersion dry matter and the dry matter of the total fiber composition.  
     
     
         16 . The method according to  claim 15 , characterized in that the polymer dispersion is used in an amount of 0.5 to 10 kg/ ton of paper calculated as the dispersion dry matter and the dry matter of the total fiber composition.  
     
     
         17 . The method according to  claim 15 , characterized in that the polymer dispersion is used in an amount of 0.5 to 5 kg/ ton of paper calculated as the dispersion dry matter and the dry matter of the total fiber composition.  
     
     
         18 . The method according to anyone of the preceding claims, characterized in that a fiber composition is used in the production of the paper, which consists of lignin containing, chemically treated fiber or de-inked fiber or a mixture of the aforementioned fiber types.  
     
     
         19 . The method according to anyone of the preceding claims, characterized in that filler material is used in the production of the paper in an amount of over 5% calculated as dry matter on the total dry matter of the fiber composition.  
     
     
         20 . The method according to anyone of the preceding claims, characterized in that filler material is used in the production of the paper in an amount of over 10% calculated as dry matter on the total dry matter of the fiber composition.  
     
     
         21 . The method according to anyone of the preceding claims, characterized in that filler material is used in the production of the paper in an amount of over 15% calculated as dry matter on the total dry matter of the fiber composition.  
     
     
         22 . The method according to anyone of the preceding claims, characterized in that filler material is used in the production of the paper in an amount of over 20% calculated as dry matter on the total dry matter of the fiber composition.  
     
     
         23 . The method according to anyone of the preceding claims, characterized in that, besides the polymer dispersion, a further hydrophobic agent is added to the fiber stock.  
     
     
         24 . The method according to  claim 23 , characterized in that alkenyl-succinic acid is added. as the further hydrophobic agent  
     
     
         25 . The method according to  claim 23 , characterized in that a rosin size is added. as the further hydrophobic agent  
     
     
         26 . The method according to  claim 23 , characterized in that an alkyl-ketene-dimer is added, as the further hydrophobic agent  
     
     
         27 . The method according to anyone of the  claims 1  to  26 , characterized in that the polysaccharide is added to the fiber stock in an amount of 0.1 to 20 kg/ton of fiber.  
     
     
         28 . The method according to  claim 27 , characterized in that the polysaccharide is added to the fiber stock in an amount of 0.1 to 15 kg/ton of fiber.  
     
     
         29 . The method according to  claim 27 , characterized in that the polysaccharide is added to the fiber stock in an amount of 0.5 to 6 kg/ton of fiber.  
     
     
         30 . The method according to  claim 27 , characterized in that the polysaccharide is added to the fiber stock in an amount of 0.1 to 3 kg/ton of fiber.  
     
     
         31 . The method according to  claim 27 , characterized in that the polysaccharide is added to the fiber stock in an amount of over 1.5 kg/ton of fiber.  
     
     
         32 . A calendered or super-calendered paper or board produced in accordance with the method of anyone of the preceding  claims 1  to  25 .  
     
     
         33 . The paper or board according to  claim 32  for off-set and gravure printing.  
     
     
         34 . A mixure to be added in connection with the production of paper to the fiber stock, characterized in that the mixture contains polysaccharide and, in addition, as a hydrophobic agent, at least a dispersed polymer which contains hydrophobic monomers.  
     
     
         35 . The mixture according to  claim 34 , characterized in that the polysaccharide has undergone essentially no thinning, has a viscosity of over 400 mPas, and a low cationic degree of substitution (DS) of 0.01 to 0.05.  
     
     
         36 . The use of a mixture in the production of a lignin containing papers suitable for offset- and gravure printing, especially for gravure printing, which mixture contains a polysaccharide and, in addition, as a hydrophobic agent, at least a dispersed polymer which contains hydrophobic monomers.  
     
     
         37 . A use of a polysaccharide and a dispersed polymer which contains hydrophobic monomers, together, added to the fiber stock in the production of a paper suitable for gravure printing.  
     
     
         38 . The use according to  claim 37 , where the polysaccharide and the dispersed polymer which contains hydrophobic monomers, are added simultaneously.  
     
     
         39 . The use according to claims  38 , where the polysaccharide and the dispersed polymer which contains hydrophobic monomers, are added as a mixture.  
     
     
         40 . The use according to anyone of the preceding  claims 37  to  39 , where the dispersed polymer is added to the fiber stock in an amount of 0.1 to 20 kg/ton of fiber.  
     
     
         41 . The use according to anyone of the preceding  claims 37  to  40 , where the dispersed polymer is added to the fiber stock in an amount of 0.5 to 20 kg/ton of fiber.  
     
     
         42 . The use according to anyone of the preceding  claims 37  to  41 , where the polysaccharide added to the fiber has a degree of substitution of 0.01 to 1.2 relative to the compounds with an electric charge.  
     
     
         43 . The use according to anyone of the preceding  claims 37  to  42 , where the polysaccharide added to the fiber stock has undergone substantially no thinning and has a degree of substitution of 0.01 to 0.05 relative to compounds with an electric charge.  
     
     
         44 . A use of a calendered or in a similar manner treated paper in gravure printing, which paper contains polysaccharide and, in addition, as a hydrophobic agent, at least a dispersed polymer which contains hydrophobic monomers.