Patent ID: 8329803
Filing Date: 2012-12-11
Classification: C08F,C08L,C09D,Y10T

Abstract:
1. A process for preparing an aqueous polymer dispersion, the process comprising: copolymerizing monomers comprising (a) at least one vinylaromatic compound, (b) at least one conjugated aliphatic diene, and (c) at least one ethylenically unsaturated carbonitrile, in an aqueous medium as a polymerization mixture, in the presence of a degraded starch and of at least one free radical initiator, wherein at least a part of said monomers (a) and (b) differing from said ethylenically unsaturated carbonitriles (c) and which are copolymerized with monomer (c) are polymerized before the ethylenically unsaturated carbonitriles (c) are added to the polymerization mixture.