Coating compositions based on polyol-containing film forming components and organic alcoholic reactive diluents

Claim 1

A coating composition capable of liquid application to a substrate, the vehicle portion of the composition consisting essentially of: (a) from about 60 percent to about 97 percent of a polyol-containing curable film forming component having a hydroxyl equivalent weight of from about 40 to about 500 and a hydroxyl functionality of at least 2.0, said component being an interpolymer of an unsaturated carboxylic acid amide with at least one other monomer having a ##STR8## group and characterized in having amido hydrogen atoms replaced by --RCHOR 1 wherein R is hydrogen or a saturated lower aliphatic hydrocarbon radical and R 1 is hydrogen or a lower alkyl radical; and (b) from about 3 percent to about 40 percent of an organic reactive diluent capable of chemically combining with the curable film forming component, said reactive diluent having one primary or secondary hydroxyl group and selected from the group consisting of ethers having less than 5 ether groups, amides, esters, urethanes, ureas, sulfur-containing compounds and mixtures thereof, said amides being selected from the group consisting of a product of the reaction of a monoamine with a lactone, a product of the reaction of an alkanolamine with a monocarboxylic acid or its ester, a product of the reaction of a monoamine with a dicarboxylic anhydride followed by reaction with a monoepoxide, and a product of the reaction of an alkanolamine with a dicarboxylic anhydride, and further characterized by having a retained solids value of greater than about 80 percent, a hydroxyl equivalent weight of from about 180 to about 800 and a liquid viscosity of less than about 10 poises at 60° C.