Patent ID: 6200639
Filing Date: 2001-03-13
Classification: C08G,C08L,C09D

Abstract:
Coating composition comprising a binder composition, solvent and/or water and optionally pigments and/or fillers and optionally the conventional additives in lacquers, characterized in that the binder composition comprises:A) 25 to 75 wt. % of one or more carboxyl-functional (meth)acrylic copolymers with a number-average molecular weight of 1,000 to 3,000 g/mol and/or one or more carboxyl-functional polyesters with a number-average molecular weight of 500 to 4,000 g/mol, the carboxyl functionality of which in each case corresponds to an acid number of 15 to 300 mg KOH/g,B) 25 to 75 wt. % of one or more epoxide-functionalized (meth)acrylic copolymers with a number-average molecular weight of 200 to 10,000 g/mol, an epoxide equivalent weight of 200 to 700 and a glass transition temperature of -20 to 70.degree. C., which have been prepared co-using 3 to 50 wt. %, based on the total weight of the monomer units, of tert-butyl (meth)acrylate as a monomer unit, the ratio of the amounts of A) to B) being chosen such that the molar ratio of their reactive groups is 1:3 to 3:1.C) 0 to 50 wt. % of one or more polyols which have at least two hydroxyl functions in the molecule and differ from a component A) optionally containing hydroxyl functions,D) 0 to 40 wt. % of components which crosslink with hydroxyl groups to form ethers, and/or of a crosslinking agent based on triazine,E) 0 to 40 wt. % of one or more polyisocyanates, which can optionally be masked,F) 0 to 50 wt. % of an anhydride component comprising at least one organic polyanhydride with at least two cyclic carboxylic acid anhydride groups per molecule,G) 0 to 20 wt. % of one or more reactive thinners with an epoxide function,H) 0 to 10 wt. % of one or more catalysts to catalyse the reaction of carboxyl and epoxide groups,the sum of the wt. % of components A) to H) adding up to 100 wt. %.