Patent ID: 8003716
Filing Date: 2011-08-23
Classification: C08F,C08L,C09D,C09J,D21H

Abstract:
1. An aqueous polymer dispersion based on copolymers of vinyl aromatics and conjugated aliphatic dienes, wherein said polymer dispersions have a mean particle size of from 80 to 150 nm and are obtained by free radical emulsion copolymerization of (a) from 19.9 to 80 parts by weight of at least one vinyl aromatic compound, (b) from 19.9 to 80 parts by weight of at least one conjugated aliphatic diene, (c) from 0.1 to 10 parts by weight of at least one ethylenically unsaturated acid and (d) from 0 to 20 parts by weight of at least one other monoethylenically unsaturated monomer, the sum of the parts by weight of the monomers (a), (b), (c) and (d) always being 100, in an aqueous medium in the presence of at least one degraded starch having an intrinsic viscosity η