Abrasion resistant fluoroolefin coating composition

Claim 1

A thermally curable coating composition comprising a solution in a compatible solvent of an esterification catalyst and I. an aliphatic carboxylic acid containing at least four carboxyl groups and having at least four carbon atoms in its chain and in which the carbon chain may be interrupted by oxygen or sulfur atoms, said acid being free of ester groups, and Ii. a fluoroolefin copolymer of the fluoroolefin of the formula CFX = CX'X", wherein X is hydrogen or fluorine, X' is hydrogen, fluorine or chlorine and X" is hydrogen, chlorine, fluorine, lower perfluoroalkyl or lower perfluoroalkoxy, and a vinyl ether compound of the formula CH 2 = CHOR wherein R is an alkyl or oxyalkyl group of up to 13 carbon atoms which contains at least one hydroxyl group, said fluoroolefin copolymer having a ratio of fluorine atoms to hydroxyl groups of between 1:1 and 22:1, said copolymer containing between about 6 and about 65% by weight fluorine and having a number average molecular weight of about from 30,000 to 80,000 and a weight average molecular weight of about from 350,000 to 550,000; wherein the amount of acid present in said solution is such that the number of carboxylic groups is at least about equal to and as high as about twice the number of hydroxyl groups present in the copolymer wherein the copolymer and the acid are dissolved in the solvent or solvent mixture in an amount sufficient to provide a solution viscosity which is suitable for coating operations and wherein the solvent is substantially inert to the fluoroolefin copolymer and the aliphatic carboxylic acid.