Patent ID: 7790236
Filing Date: 2010-09-07
Classification: C09D

Abstract:
1. Coating composition for the manufacture of a car wash-resistant coating, comprising: at least one epoxy-functional binder selected from the group of epoxy-functional acrylic binders, epoxy-functional polyester binders or epoxy-functional polyether binders; and one or more acid functional cross-linkers, and optionally at least one of: anhydride, amino and isocyanate functional cross-linkers, wherein the cross-linkers are reactive with reactive groups of the binder, wherein the binder and cross-linker are selected such that, after curing to a coating, the coating has an initial gloss of at least 81 GU and a loss of gloss (LoG) of less than 0.25, and wherein, in case the binder is an acrylic binder, the acrylic binder comprises: at least 20 weight percent based on the total weight of monomers of epoxy group-containing monomers, more than 10 mole percent of monomers selected from a group of non-epoxy-functional low Tg monomers with a monomer Tg not exceeding 253K for acrylic non-epoxy-functional monomers, or not exceeding 293 K for methacrylic or non-acrylic non-epoxy-functional monomers, and an average epoxy equivalent weight value of between 200 and 700 g/mol, and a free surplus hydroxyl value less than 30 mg KOH/g solid coating.