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US 5,288,820 AGranted
Thermosetting coating compositions
AssigneeEastman Kodak Company
InventorsFranklin D. Rector, Jr., J. Stewart Witzeman
Life of this patent
Estimating the term…
Abstract
Disclosed are thermosetting or curable coating compositions comprising (1) a film forming polymeric material bearing acetoacetate residues, (2) an amino resin cross-linking or curing material, (3) an organic sulfonic acid cross-linking or curing catalyst, and (4) an epoxide compound selected from limonene monoepoxide, limonene diepoxide and a mixture thereof. The presence of the limonene epoxide inhibit discoloration of the coating composition upon prolonged storage, especially at elevated temperatures.
Claims5
A thermosetting coating composition comprising an inert solvent having dissolved therein:
- (1) about 50 to 80 weight percent of a film forming polymeric material selected from polyesters and acrylic polymers bearing acetoacetate residues, said percent being based on the weight of film-forming polymeric material and the solvent;
- (2) about 49 to 5 weight percent, based on the weight of polymeric material (1), of an amino resin cross-linking agent;
- (3) about 0.05 to 2 weight percent, based on the combined weight of polymeric material (1) and cross-linking agent (2), of an organic sulfonic acid cross-linking or curing catalyst;
- and
- (4) an epoxide compound selected from limonene monoepoxide, limonene diepoxide and mixtures thereof wherein the mole ratio of epoxide compound (4) to organic sulfonic acid (3) is about 0.8:1 to 1.5:1.
2 more elements
Dependencies are inferred from the claim text.