Back to results
US 4,403,093 AGranted
Polyesters
AssigneePPG Industries, Inc.
InventorsMarvis E. Hartman, Barbara A. Greigger, Rostyslaw Dowbenko
Life of this patent
Estimating the term…
Abstract
Ungelled polyester oligomers which are formed from reacting polyols, 1,2-dicarboxylic acid anhydrides and polyepoxides are disclosed. The polyesters are useful as resinous binders in high solids coating compositions. The coating compositions can be applied by spraying and do not result in a tacky overspray common with many high solids coating compositions.
Claims18
A process for preparing an ungelled polyester oligomer which comprises:
- (A) reacting a 1,2-dicarboxylic acid anhydride with a polyol under conditions sufficient to form a half-ester with substantially no polyesterification product, and
- (B) reacting said half-ester with a polyepoxide under conditions sufficient to form said ungelled polyester oligomer.
An ungelled polyester oligomer having the following structural formula:
- ##STR4## where Z is the residue of a polyepoxide after ring opening with a carboxylic acid group;
- R is an aliphatic or an aromatic group;
- X is the residue of a polyol after reaction with a carboxylic acid anhydride and m corresponds to the number of epoxy groups of the polyepoxide ring opened with carboxylic acid groups.
Dependencies are inferred from the claim text.