Claims
- 1. A curable coating composition comprising:(a) an adduct having carboxyl and hydroxyl groups comprising the reaction product of: (i) a compound or polymer containing pendant and/or terminal hydroxyl or epoxy groups; and (ii) a material selected from the group consisting of tartaric acid, malic acid, adipic acid, and combinations thereof; wherein the carboxyl functionality of the adduct is in a terminal and/or pendant position and is derived from the reaction of the hydroxyl groups and/or the epoxy groups with the acids of (ii); and (b) an anhydride curing agent.
- 2. The curable coating composition of claim 1 wherein material (ii) comprises tartaric acid.
- 3. The curable coating composition of claim 1 wherein reactant (i) is an acrylic polymer containing pendant and/or terminal hydroxyl or epoxy functional groups.
- 4. The curable coating composition of claim 1 wherein reactant (i) is a polyester polymer containing pendant and/or terminal hydroxyl or epoxy functional groups.
- 5. The curable coating composition of claim 1 wherein reactant (i) is a reaction product of a polyglycidyl ether of a cyclic polyol and a dicarboxylic acid, the reaction product (i) containing pendant and/or terminal epoxy groups.
- 6. The curable coating composition of claim 5 wherein the dicarboxylic acid reacted with reactant (i) is a fatty acid dimer having at least 8 carbon atoms.
- 7. The curable coating composition of claim 1 further comprising at least one pigment.
CROSS-REFERENCE TO RELATED APPLICATIONS
This application is related in subject matter to commonly assigned U.S. patent application Ser. No. 08/720,937, filed Oct. 4, 1996, now abandoned, and U.S. patent application Ser. No. 08/928,533, now U.S. Pat. No. 5,891,960, which disclose citric acid containing polymers for enhancing adhesion of coating compositions, and U.S. patent application Ser. No. 09/145,691, filed Sep. 2, 1998, now U.S. Pat. No. 6,084,036, which discloses the use of citric acid polymers in an anhydride cured coating, optionally with the addition of a polyisocyanate. These applications, like the present invention, deal with improving adhesion of coatings to metal.
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