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AssigneePPG Industries, Inc.
InventorsDennis A. Simpson, Debra L. Singer, Rostyslaw Dowbenko, William P. Blackburn, Charles M. Kania
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A color-plus-clear coating system is disclosed. A pigmented or colored base coat is first applied to a substrate followed by the application of a transparent top coat to the base coat. Either the transparent top coat, the base coat or both the top coat and base coat compositions are crosslinkable compositions comprising a polyepoxide and a polyacid curing agent which comprises a half-ester formed from reacting an acid anhydride with a polyol. The polyepoxide-polyacid curing agent in the transparent top coat provides a composite coating with outstanding gloss and distinctness of image making the composite coating particularly useful as an automotive top coat.
A process for applying a composite coating to a substrate which comprises applying to the substrate a colored film-forming composition to form a base coat and applying to said base coat a clear film-forming composition to form a transparent top coat over the base coat comprising as the clear film-forming composition and/or as the colored film-forming composition a crosslinkable composition comprising a polyepoxide and a polyacid curing agent which is a half-ester formed from reacting an acid anhydride with a polyol;
Dependencies are inferred from the claim text.