C - Chemistry – Metallurgy – 08 – G
Patent
C - Chemistry, Metallurgy
08
G
117/149, 400/401
C08G 18/62 (2006.01) C09D 133/06 (2006.01)
Patent
CA 1159186
ABSTRACT A thermosetting acrylic powder coating compo- sition contains an acrylic copolymer of a monoethylen- ically unsaturated monomer having at least one epoxy group and at least one monoethylenically unsaturated monomer which is free of epoxy groups, a carboxy-termi- nated primary crosslinking agent, a supplementary cross- linking agent having at least one functional group which can react with either hydroxyl groups or car- boxylic acid groups, and at least one ultraviolet light stabilizer or ultraviolet light screener capable of preventing degradation of the coating by ultraviolet light. An acrylic copolymer of methyl methacrylate, n-butyl methacrylate, and glycidyl methacrylate is favored. Preferably, the composition contains a combi- nation of ultraviolet light stabilizer and ultraviolet light screener, is nonpigmented, and provides a clear, glossy, and durable film useful as the clear coat of a clear coat/color coat automobile finish.
381911
E. I. Du Pont de Nemours And Company
Mccallum Brooks & Co.
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