Patent ID: 6727327
Filing Date: 2004-04-27
Classification: C08F,C09J

Abstract:
A process comprisingpolymerizing a monomer mixture in the presence of at least 0.01% by weight of at least one molecular weight regulator to form an aqueous polymer dispersion of a particulate polymer having a glass transition temperature Tg of less than 0Â° C., wherein the polymerization is an aqueous emulsion polymerization carried out in a reaction vessel and the molecular weight regulator is added continuously to the reaction vessel during the polymerization, wherein the monomer mixture consists essentially of M1 from 60 to 94.9% by weight of n-butyl acrylate, M2 from 5 to 39.9% by weight of at least one of a C1 to C4 alkanol ester of methacrylic acid, tert-butyl acrylate, or a vinylaromatic monomer, and M3 from 0.1 to 5% by weight of at least one ethylenically unsaturated compound having at least one acid group, wherein % by weight is based on 100% by weight of the monomer mixture.