Patent ID: 6077608
Filing Date: 2000-06-20
Classification: B05D,C08L,C09D,Y10S,Y10T

Abstract:
Multilayered composite film over a substrate, wherein the composite film comprises a clear coat layer over a base coat layer, said multilayered composite film made by a process comprising:a) forming a base coat layer over a substrate, said base coat layer:i) having a film thickness in the range of 2.54 to 76.2 microns,ii) being formed by dehydrating a waterborne coating without total curing at a temperature up to 90.degree. C. for up to 10 minutes, andiii) comprising:a. at least one film-forming polymer compatible with the functional acrylic film-forming polymer or copolymer in a powder coating used in forming a clear coat layer,b. at least one pigment, andc. at least one crosslinking agent for said at least one film-forming polymer compatible with the functional acrylic film-forming polymer or copolymer; andb) forming a clear coat layer over the base coat layers said clear coat layer:i) having a film thickness in the range of 35 to 100 microns,ii) being formed by co-curing a powder coating, said powder coating has a glass transition temperature (Tg) of at least 25.degree. C., and said powder coating comprising:a. a predominant amount of a functional acrylic film-forming polymer or copolymer comprising at least one acrylic polymer or copolymer having a weight average molecular weight in the range of 2000 to 6000, wherein the amount of functionality in the functional acrylic film-forming polymer or copolymer is at least 40 weight percent of the resin solids of the powder coating, andb. at least one curing agent.