Patent ID: 7282545
Filing Date: 2007-10-16
Classification: C08F

Abstract:
1. A process for preparing an aqueous styrene-butadiene polymer dispersion, comprising: polymerizing, in an aqueous emulsion containing a free radical initiator, by a monomer feed technique, in a polymerization vessel a monomer mixture M comprising the emulsion also containing from 0.05 to 0.5% by weight, based on 100% by weight of monomers, of at least one hydrocarbon compound polymerization regulator selected from the group consisting of compounds having from 6 to 20 carbon atoms, which upon abstraction of a hydrogen atom form a pentadienyl or 1-phenylallyl radical, and α-methylstyrene dimer, wherein in said monomer feed technique, at least 90% of a total of said monomer mixture M is added to said polymerization vessel under polymerization conditions, said polymerization vessel having also been initially charged with material that contains at least 30% of the hydrocarbon compound and then supplying the remainder of the hydrocarbon compound to the polymerization reaction medium in the course of the polymerization reaction.