Patent ID: 6034157
Filing Date: 2000-03-07
Classification: C08F,C09D

Abstract:
A process for producing an aqueous coating composition containing a polymeric binder of internally crosslinked microgel particles, the process for internally crosslinking the microgel particles and forming the coating composition comprising:emulsion copolymerizing ethylencially unsaturated monomers including carboxyl functional monomers in an aqueous medium, where the monomers are copolymerized in the presence of a diepoxide resin having an epoxide equivalent weight between 100 and 5000, to form an aqueous emulsion of carboxyl functional addition copolymer containing non-reacted diepoxide resin dispersed in the emulsion carboxyl functional addition copolymer;heat reacting the diepoxide resin with the carboxyl function addition copolymer to form an aqueous polymeric dispersion of internally crosslinked microgel particles; andproducing an aqueous coating composition containing the internally crosslinked microgel particles as the polymeric binder.