Aqueous starch containing polymer dispersion for paper applications

摘要

The invention concerns an aqueous starch-containing polymer dispersion obtainable by co-polymerization of ethylenically unsaturated monomers comprising: (a) from 20 to 50 wt % of at least one of styrene or substituted styrene; (b) from 20 to 60 wt % t-butyl (meth)acrylate; and, (c) from 0 to 20 wt % of at least one ethylenically unsaturated co-polymerizable monomer being different from (a) and (b), in the presence of (d) from 10 to 50 wt % cationic starch, wherein the sum of (a)+(b)+(c)+(d) is 100%. The invention further concerns preparation and use thereof.

主权项

1. An aqueous starch-containing polymer dispersion suitable for surface treatment of paper made fully or partially of recycled paper, said dispersion obtained by co-polymerization of ethylenically unsaturated monomers consisting of:
(a) from 20 to 50 wt % of at least one of styrene or substituted styrene; (b) from 20 to 60 wt % t-butyl acrylate; and (c) from 0 to 20 wt % of at least one ethylenically unsaturated co-polymerisable monomer being different from (a) and (b), in the presence of (d) from 10 to 50 wt % cationic starch having a degree of substitution (DS) from 0.005 to 0.5, wherein the sum of (a)+(b)+(c)+(d) is 100% and wherein ratio of: monomer (c): t-butyl acrylate (b) is between 0:1 to 0.1:1.