Coating composition containing a reactive urethane component, a hydroxyl containing acrylic polymer having pendent ester groups and a metallic alkylate catalyst

A coating composition containing 10-80% by weight of a film forming binder and 20-90% by weight of an organic solvent;

• wherein the binder consists essentially of
• (1) 5-38% by weight, based on the weight of the binder, of a reactive component of the formula ##STR12## where R is a divalent or trivalent aliphatic or cycloaliphatic group,
• R.sup.1 is an alkyl group having 1-4 carbon atoms,
• n is 2-3;
• (2) 60-94.99% by weight, based on the weight of the binder, of a hydroxy containing acrylic polymer having a hydroxyl number of 50-200 and a weight average molecular weight of about 1,000-60,000 and having a backbone of polymerized monomers of the group of styrene, alkyl methacrylate, alkyl acrylate or mixtures thereof, each having 1-12 carbon atoms in the alkyl groups and having polymerized ethylenically unsaturated ester units that form ester groups pending from the carbon atoms of the backbone that comprise about 10 to 75% of the total weight of the polymer and are of Ester Group (A) ##STR13## and Ester Group (B) selected from the group consisting of ##STR14## or a mixture of these groups;
• wherein the molar ratio of ester group (A) to ester group (B) is from about 1:15 to 1:2.5;
• and wherein
• R.sup.2 is a saturated hydrocarbon radical having carbon atoms,
• R.sup.3 is an alkylene, vinylene, aromatic, carboxylic or heterocyclic radicals, and
• R.sup.4 is a saturated aliphatic hydrocarbon group;
• and
• (3) 0.01-2% by weight, based on the weight of the binder, of an organo metallic alkylate catalyst selected from the group of an aluminum alkylate, titanium alkylate, zirconium alkylate and mixtures thereof;
• said composition being cureable without the formation of free isocyanate groups during curing.