Coating of carboxyl-containing acrylic copolymer and epoxy-containing acrylic copolymer

摘要

The present invention provides a curable resin composition having good curability and storage stability, which provides a cured film having excellent weather resistance, acid resistance and mar resistance. The curable resin composition comprises: (a) 20 to 80% by weight of a polycarboxylic acid having an acid value of 25 to 300 mg KOH/g based on solid and a number average molecular weight of 500 to 20000; and (b) 20 to 80% by weight of a polyepoxide having an epoxy equivalent of 100 to 800 and a number average molecular weight of 500 to 20000, prepared by copolymerizing: (1) 10 to 60% by weight of a long-chain epoxy monomer; and (2) 40 to 90% by weight of an ethylenically unsaturated monomer having no epoxy group. The present invention also provides a process for forming a cured film using the resin composition.