Automotive refinish primer surfacer containing acetoacetate functional polyesterpolyol, a polyacrylate, and an amine functional epoxy resin
AssigneePPG Industries, Inc.
InventorsDavid N. Walters, Cathy A. Kreutzer, Padmanabhan Sundararaman
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Abstract
Curable coating compositions are provided containing an amine group containing polyepoxide resin, an acetoacetate containing polyester having a weight average molecular weight of at least 1000, and a polyacrylate containing material. The amine group containing polyepoxide can be modified with a ketone and/or an aldehyde to form a ketimine and/or an aldimine containing polyepoxide. The compositions are useful as coatings, particularly as ambient or low temperature curable automotive refinish primer coatings having good corrosion resistance, adhesion to both substrate and other organic coatings, sandability and pot-life.
Claims22
A curable coating composition comprising:
- (a) A polyepoxide resin which is essentially free of oxirane functionality and having an average of at least two amine groups per molecule and having a weight average molecular weight of from about 1000 to about 50,000;
- (b) an acetoacetate group functional polyester, which is the transesterification reaction product of a polyester polyol and an acetoacetate, the polyester polyol prepared by esterification of an organic polycarboxylic acid or anhydride thereof with organic polyol and/or epoxide, and having a weight average molecular weight of from about 1000 to about 50,000;
- (c) a polyacrylate having at least two acrylate groups per molecule and having a weight average molecular weight from about one hundred to about 50,000.
Dependencies are inferred from the claim text.