Flexible etch-resistant finishes with siloxane cross-linking
AssigneeE. I. Du Pont de Nemours and Company
InventorMaurice A. S. Stephenson
Life of this patent
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Abstract
A coating composition is disclosed comprising an organosilane polymer, a polyester or a copolymer thereof, an amino resin crosslinking agent, and a silsesquioxane compound. Such a composition is especially useful for providing a flexible finish on non-metallic parts of automobiles and trucks. This finish has the advantage of superior etch resistance and outstanding weatherability and durability characteristics.
Claims15
A coating composition useful for coating a substrate, which comprises:
- (a) from about 2 to 40% by weight, based on the weight of the binder solids, of an organosilane polymer having a weight average molecular weight of about 500-30,000 and which is the polymerization product of about 30-95% by weight ethylenically unsaturated non-silane containing monomers and about 5-70% by weight ethylenically unsaturated silane containing monomers, based on the weight of the organosilane polymer;
- (b) from about 30 to 70% by weight, based on the weight of binder solids, of a polyester or a copolymer thereof having a hydroxyl number of about 10-200 and a weight average molecular weight of about 6,000-30,000;
- (c) from about 20 to 40%, based on the weight of the binder solids, of an amino resin crosslinking agent;
- (d) from about 1 to 15% of one or more silsesquioxane compounds;
- (e) an effective amount of a curing catalyst;
- and
- (f) from about 20 to 80% by weight, based onthe weight of the composition, of a liquid organic carrier.
A coating composition according to cliam 1, wherein the composition comprises about 50-80% by weight of film-forming binder and about 20-50% by weight of an organic solvent for the binder.
Dependencies are inferred from the claim text.