Patent ID: 7893150

Claim:
A process for the production of polyurethanes, comprising reacting (A) one or more polyisocyanates with (B) a polymer dispersion prepared by free-radically polymerizing styrene in the presence of a) at least one polyester polyol having sulfur atoms and that is free of olefinically unsaturated groups, and b) a solvent selected from the group consisting of benzene, xylene and toluene; wherein the polyester polyol having sulfur atoms comprises the reaction product of (1) one or more base polyester polyols, with (2) one or more compounds corresponding to the formula: (HS) m—R 1 —(COOR 2 ) n wherein: m and n: each independently of each other represent a value greater than or equal to 1, R 1 : represents an alkylene group with 1 to 11 carbon atoms or an alkylidene group with 1 to 11 carbon atoms, and R 2 : represents an alkyl group with 1 to 5 carbon atoms or a hydrogen atom.