Patent ID: 6303189
Filing Date: 2001-10-16
Classification: C08L,C09D

Abstract:
A method for extending the open time of an aqueous coating composition comprising:a) forming an aqueous coating composition comprising at least one film-forming latex polymer formed from at least one ethylenically-unsaturated monomer, said film-forming polymer having a glass transition temperature in the range of from -15.degree. C. to +50.degree. C.;b) admixing with said aqueous coating composition:at least one aqueous-based polyurethane dispersion having a glass transition temperature less than the glass transition temperature of the latex polymer, said polyurethane dispersion being non-reactive with said film-forming latex polymer; andat least one water soluble coalescent;b) applying said aqueous coating composition to an architectural substrate; andc) drying said aqueous coating composition at temperatures in the range of from 0.degree. C. to 40.degree. C.wherein said aqueous coating composition is free from water-insoluble coalescents.