Clear coat/color coat finish from a high solids coating composition of a blend of a low molecular weight acrylic polymer and a medium molecular weight acrylic polymer and an alkylated melamine cross- linking agent

摘要

A substrate that has a finish of a clear coat top layer in firm adherence to a color coat layer containing pigments that is in adherence to the substrate; the clear coat and color coat are formed from a high solids coating composition contains at least 50% by weight of a binder of film-forming constituents in which the constituents are of P P(A) a medium molecular weight acrylic polymer that has a number average molecular weight of about 5,000-20,000, a hydroxyl content of at least 2% by weight, a glass transition temperature of about -20° C. to +20° C.;PP(B) a low molecular weight acrylic polymer that has a number average molecular weight of about 500-7,500 a hydroxyl content of at least 2% by weight, a glass transition temperature of about -20° C. to +25° C.; wherein the acrylic polymers are the same or different and contain and alkyl methacrylate, a hydroxy alkyl acrylate or a hydroxy alkyl methacrylate, and optionally, an alkyl acrylate and styrene;PP(C) an alkylated melamine formaldehyde cross- linking agent; andPPan acid catalyst; PPclear coat/color coat finishes are particularly useful as an exterior finish for automobiles, trucks and airplanes.