| abstract |
A curable composition comprising A) a mixture of A1) at least one polymer based on acrylate and/or methacrylate monomers and containing on average 0.1 to 4.0 equivalents of free carboxyl groups per kilogram of polymer, and A2) at least one carboxyl-terminated polyester which contains on average 0.2 to 6 equivalents of free carboxyl groups per kilogram of polyester such that component A1) constitutes 50 to 90% by weight, and component A2) makes up the remainder, of the mixture A; B) an epoxy resin containing 2 or more epoxy groups per molecule, selected from; glycidyl esters of cyclic carboxylic acids, glycidyl ethers of trimethylolpropane, glycidyl ethers of bis(dimethylolpropyl) ether, and reaction products of glycidyl ether derivatives of trimethylolpropane or bis(dimethylolpropyl) ether with aliphatic or cycloaliphatic polyisocyanate monomers or oligomers, or a mixture of two or more than two of these epoxy resins; C) a catalyst for speeding up the thermal reaction of epoxy and carboxyl groups, and D) an inert solvent; the molar ratio of free carboxyl groups to epoxy groups in said composition being 0.3:1 to 3:1, and said composition containing, except for component B, no components carrying epoxy groups. The composition is generally suitable as coating agent, especially as lacquer for coating automobile parts. |