Patent ID: 9079995
Filing Date: 2015-07-14
Classification: C08F,C08K,D21H

Abstract:
1. An aqueous polymer dispersion obtained by free radical emulsion copolymerization of ethylenically unsaturated monomers in the presence of (a) 10 to 40 weight-% polysaccharide containing a free hydroxyl group, the monomers comprising (b) 30 to 60 weight-% of at least one optionally substituted styrene, (c) 60 to 30 weight-% of at least one C1-C4-alkyl (meth)acrylate, and (d) 0 to 10 weight-% of other ethylenically unsaturated copolymerizable monomers, and using (e) a graft-linking, water-soluble redox system as free radical initiator for the free radical emulsion copolymerization, wherein the sum (a)+(b)+(c)+(d) is 100%, wherein the dry solids content of the dispersion is >35 weight-%, based on the weight of the total dispersion and the polymer dispersion has a D(50) value <60 nm and D(99) value <130 nm for polymer particles in the polymer dispersion.