Coating containing acrylosilane polymer to improve mar and acid etch resistance

A coating composition comprising 40-70% by weight of film forming binder and 30-60% by weight of a volatile liquid carrier for the binder;

• wherein the binder comprises about
• a. 30-70% by weight, based on the weight of the binder, of an acrylic polymer consisting essentially of polymerized monomers selected from the group consisting of an alkyl methacrylate, an alkyl acrylate, each having 1-12 carbon atoms in the alkyl group, isobornyl methacrylate, isobornyl acrylate, hydroxy alkyl methacrylate, hydroxy alkyl acrylate each having 1-4 carbon atoms in the alkyl group, styrene and any mixtures thereof;
• b. 5-30% by weight, based on the weight of the binder, of an acrylosilane polymer consisting essentially of polymerized monomers selected from the group consisting of an alkyl methacrylate, an alkyl acrylate, each having 1-12 carbon atoms in the alkyl group, isobornyl methacrylate, isobornyl acrylate, hydroxy alkyl methacrylate, hydroxy alkyl acrylate each having 1-4 carbon atoms in the alkyl group, styrene and any mixtures thereof and an ethylenically unsaturated hydroxy functional acrylosilane monomer;
• and
• c. 25-50% by weight, based on the weight of the binder of an organic polyisocyanate comprising a mixture of the trimer of hexamethylene diisocyanate and the isocyanurate of isophorone diisocyanate.