Patent ID: 6344503
Filing Date: 2002-02-05
Classification: C08G

Abstract:
A process for producing a water-based graft copolymer of a carboxyl functional polyester and an ethylenically unsaturated monomer comprising:(a) reacting at least one carboxyl group of the polyester having an acid number of less than about 200 with an epoxy-functional vinyl monomer which functions as a bridging agent as that is capable of forming a bridging group between a carboxyl group of the polyester and a copolymerizable ethylenically unsaturated monomer; (b) forming with the aid of a surfactant an emulsion in water of the product of step (a) and a copolymerizable ethylenically unsaturated monomer which is different from the aforesaid bridging agent; and (c) reacting the aforesaid copolymerizable ethylenically unsaturated monomer with the bridging group of the product of step (a) and polymerizing the resulting product in the water emulsion of step (b) to form the aforesaid graft copolymer.