Composition for surface colouration of paper

Abstract

The invention relates to a composition fur surface coloration of paper web comprising a) from 0.1 to 30% by weight, based on the total weight of the composition, of a colouring pigment, b) from 0.1 to 20% by weight, based on the total weight of the composition of a starch/latex copolymer, characterized in that, in addition to stare ii, the monomeric components that are copolymerized comprise i) styrene or a substituted styrene, ii) acrylate and/or methacrylate and, optionally, iii) one or more further ethylenically unsaturated monomers, c) from 0 to 20% by weight, based on the total weight of the composition, of starch or a starch derivative, d) from 0 to 10% by weight, based on the total weight of the composition of one or more auxiliaries and e) water to complete to 100% by weight, based on the total weight of the composition.

1 . A composition comprising
 a) from 0.1 to 30% by weight, based on the total weight of the composition, of a colouring pigment,   b) from 0.1 to 20% by weight, based on the total weight of the composition of a starch/latex copolymer, characterized in that, in addition to starch, the monomeric components that are copolymerized comprise
 i) styrene or a substituted styrene, 
 ii) an acrylate and/or methacrylate and, optionally, 
 iii) one or more further ethylenically unsaturated monomers, 
   c) from 0 to 20% by weight, based on the total weight of the composition, of starch or a starch derivative,   d) from 0 to 10% by weight, based on the total weight of the composition of one or more auxiliaries and   e) water to complete to 100% by weight, based on the total weight of the composition.   
     
     
         2 . A composition according to  claim 1 , in which the colouring pigment is selected from pigments disclosed in the Colour Index International under the designations C.I., Pigment Yellows 1 to 221, C.I. Pigment Oranges 1 to 81, C.I. Pigment Reds 1 to 283, C.I., Pigment Violets 1 to 53, C.I. Pigment Blues 1 to 81, C.I. Pigment Greens 1 to 56, C.I. Pigment Browns 1 to 47 and C.I. Pigment Blacks 1 to 35. 
     
     
         3 . A composition according to  claim 1 , wherein the starch/latex copolymer consists of
 i) from 5 to 50% by weight of starch and   ii) from 50 to 95% by weight of the monomeric components.   
     
     
         4 . A composition according  claim 1 , wherein the starch component of the copolymer, component b) of the composition, is a degraded, oxidized anionic starch. 
     
     
         5 . A composition according to  claim 1 , in which the starch/latex copolymer is obtained by copolymerization of
 i) from 20 to 40% by weight of styrene or a substituted styrene,   ii) from 20 to 50% of an acrylate or a methacrylate and   iii) from 5 to 2.0% by weight of one or more further ethylenically unsaturated monomers, in the presence of from 15 to 40% by weight of starch.   
     
     
         6 . A composition according to  claim 1 , in which the starch/latex copolymer is in the form of an aqueous dispersion having a dry content of from 20 to 50% by weight. 
     
     
         7 . A composition according to  claim 1 , wherein the auxiliary is selected from fixing agents, dispersants, binder resins, insolubilizing and/or cross linking agents, anionic, cationic and neutral polymers, wet-strength agents, antifoams and biocides. 
     
     
         8 . (canceled) 
     
     
         9 . A method for the surface colouration of paper by applying to the paper surface a composition comprising
 a) from 0.1 to 30% by weight, based on the total weight of the composition, of a colouring pigment, whereby the colouring pigment is in solid form or in the form of a dispersion,   b) from 0.1 to 20% by weight, based on the total weight of the composition of a starch/latex copolymer, characterized in that, in addition to starch, the monomeric components that are copolymerized comprise
 i) styrene or a substituted styrene, 
 ii) an acrylate and/o methacrylate and, optionally, 
 iii) one or more further ethylenically unsaturated monomers, 
   c) from 0 to 20% by weight, based on the total weight of the composition, of starch or a starch derivative,   d) from 0 to 10% by weight, based on the total weight of the composition of one or more auxiliaries and   e) water to complete to 100% by weight, based on the total weight of the composition.   
     
     
         10 . Paper, which has been treated with a composition according to  claim 1 . 
     
     
         11 . Paper which has been treated with a composition according to the method according to  claim 9 . 
     
     
         12 . A composition according to  claim 2 , wherein the starch/latex copolymer consists of
 i) from 5 to 50% by weight of starch and   ii) from 50 to 95% by weight of the monomeric components.   
     
     
         13 . A composition according to  claim 2 , wherein the starch component of the copolymer, component b) of the composition, is a degraded, oxidized anionic starch. 
     
     
         14 . A composition according to  claim 3 , wherein the starch component of the copolymer, component b) of the composition, is a degraded, oxidized anionic starch. 
     
     
         15 . A composition according to  claim 2 , in which the starch/latex copolymer is obtained by copolymerization of
 i) from 20 to 40% by weight of styrene or a substituted styrene,   ii) from 20 to 50% of an acrylate or a methacrylate and   ii) from 5 to 20% by weight of one or more further ethylenically unsaturated monomers, in the presence of from 15 to 40% by weight of starch.   
     
     
         16 . A composition according to  claim 3 , in which the starch/latex copolymer is obtained by copolymerization of
 i) from 2.0 to 40% by weight of styrene or a substituted styrene,   ii) from 20 to 50% of an acrylate or a methacrylate and   iii) from 5 to 20% by weight of one or more further ethylenically unsaturated monomers, in the presence of from 15 to 40% by weight of starch.   
     
     
         17 . A composition according to  claim 4 , in which the starch/latex copolymer is obtained by copolymerization of
 i) from 20 to 40% by weight of styrene or a substituted styrene,   ii) from 20 to 50% of an acrylate or a methacrylate and   iii) from 5 to 20% by weight of one or more further ethylenically unsaturated monomers, in the presence of from 15 to 40% by weight of starch.