Coating composition of a glycidyl acrylic polymer, an aminoester acrylic polymer and a polyester or a polyesterurethane

Claim 1

A coating composition comprising 20-80% by weight of a binder and 80-20% by weight of a solvent for the binder, wherein the binder consists essentially of about: A. 50-70% by weight, based on the weight of the binder, of an acrylic polymer A consisting essentially of polymerized monomers of methyl methacrylate and monomers selected from the group consisting of styrene, alkyl methacrylate and alkyl acrylate each having 2-12 carbon atoms in the alkyl group and said polymer having pending from the carbon-carbon atoms of the polymer backbone reactive groups selected from the group consisting of aminoester groups of the formula ##STR12## where R is an alkylene group having 2-3 carbon atoms, hydroxyamino ester groups of the formula ##STR13## where R 1 is an alkyl group of 1-8 carbon atoms; B. 20-30% by weight, based on the weight of the binder, of an acrylic crosslinking polymer B comprising polymerized monomers of at least 3% by weight, based on the weight of the crosslinking polymer, of a glycidyl constituent selected from the group consisting of glycidyl methacrylate and glycidyl acrylate, and the remainder of the monomers being selected from the group consisting of alkyl methacrylate and alkyl acrylate or mixtures thereof each having 1-12 carbon atoms in the alkyl groups; and C. 5-48% by weight, based on the weight of the binder, of polymer C of a polyester or polyesterurethane polymer having at least 2 pendant groups of the formula ##STR14## wherein said polymers A and B each have a weight average molecular weight of about 5,000-40,000 and polymer C has a weight average molecular weight of about 300-10,000 each determined by gel permeation chromatography using polymethyl methacrylate as a standard.