Multi-component coating composition comprising an anhydride containing polymer, a glycidyl component and a phosphonium catalyst

A coating composition comprising 20-80% by weight of reactive binder components and 80-20% by weight of an organic liquid carrier;

• wherein the binder consists essentially of about
• (a) 25-90% by weight, based on the weight of the binder, of an anhydride acrylic polymer having at least two reactive anhydride groups that consists of polymerized monomers of an ethylenically unsaturated anhydride or an ethylenically unsaturated dicarboxylic acid and polymerized monomers selected from the group consisting of alkyl methacrylate, alkyl acrylate and any mixtures thereof, wherein the alkyl groups have 1-8 carbon atoms and the polymer has a weight average molecular weight of about 2,000-50,000;
• (b) 5-50% by weight, based on the weight of the binder, of a glycidyl component having at least two reactive glycidyl groups;
• and
• (c) about 0.1-7% by weight, based on the weight of the binder, of a catalyst which is a phosphonium catalyst or a blend of phosphonium catalyst and tertiary amine which may or may not contain hydroxyl groups.