Patent ID: 9023430
Filing Date: 2015-05-05
Classification: B05D,C08G,C09D,C23C,Y10T

Abstract:
1. A method for forming a composite coating on a substrate comprising: (A) applying a first, waterborne coating composition to at least a portion of a surface of the substrate, the first coating composition comprising: (i) a polymeric component containing acid functional groups and additional functional groups different from the acid functional groups; (ii) a curing agent having functional groups reactive with the additional functional groups on the polymeric component; and (iii) microgel particles different from the polymeric component and curing agent, prepared in water from a diamine and an acid functional polyisocyanate, wherein the polyisocyanate contains an average of 0.75 acid functional groups per molecule and the wherein the polyisocyanate has at least three isocyanate functional groups; and (B) applying a second coating composition to at least a portion of the first coating formed in step (A) prior to subjecting the first coating to curing conditions, to form a secondary coating thereon.