Patent ID: 8685207

Claim:
A finely divided, starch-comprising polymer dispersion obtained by free radical emulsion polymerization of ethylenically unsaturated monomers in the presence of at least one redox initiator and a starch, wherein the ethylenically unsaturated monomers comprise: (a) 40 to 50% by weight of an optionally substituted styrene, (b) 5 to 25% by weight of a C 1 -C 4 -alkyl acrylate, and (c) 0.1 to 5% by weight of another ethylenically unsaturated copolymerizable monomer, and the starch is (d) 25 to 35% by weight of at least one degraded anionic starch having a molar mass M w of 2,500 to 35,000 g/mol, wherein a sum (a)+(b)+(c)+(d) is 100% and is based on a total solids content, and the polymerization is performed in the presence of at least 0.01% by weight, based on a content of the monomers used, of at least one chain-transfer agent comprising terpinolene.