Coating composition of an acrylic polymer containing glycidyl groups and acetoacetoxy groups and an amino ester acrylic polymer

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. 60-80% by weight of the binder, of an acrylic polymer A consisting essentially of polymerized monomers of methyl metharcrylate and monomers selected from the group consisting of styrene, alkyl metharylate 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 ##STR10## where R is an alkylene group having 2-3 carbon atoms, hydroxyaminio ester groups of the formula ##STR11## groups of the formula ##STR12## where R 1 is an alkyl group of 1-8 carbons atoms; and B. 20-40% by weight, based on the weight of the binder, of an acrylic crosslinking polymer B consisting essentially of 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, at least 5% by weight of an alkyl acrylate or alkyl methacrylate having a pendent group of the formula ##STR13## and the remainder of the monomers being selected from the group consisting of alkyl methacrylate and alkyl acrylate each having 1-12 carbon atoms in the alkyl groups; wherein said polymers A and B each have a weight average molecular weight of about 5,000-40,000 determined by gel permeation chromatography using polymethyl methacrylate as a standard.