Patent ID: 7576139

Claim:
A thermosetting and photocurable clear coating composition comprising for automobiles: (A) a hydroxyl-containing resin; (B) a maleimide group-containing copolymer obtained by radical copolymerization of a maleimide group-containing monomer (a) with at least one other monomer; (C) a curing agent; (D) at least one unsaturated compound selected from the group consisting of radical polymerizable unsaturated monomers, radical polymerizable unsaturated group-containing resins, and radical polymerizable unsaturated group- and thermosetting functional group-containing resins; and (F) photopolymerization initiator, wherein the hydroxyl-containing resin (A) is a hydroxyl-containing polyester resin produced by esterifying a polybasic acid (b) with a polyhydric alcohol (c), wherein an alicyclic polybasic acid (b1) and an alicyclic polyhydric alcohol (c1) are included in a proportion of 30% to 70% by weight based on the total weight of polybasic acid (b) and polyhydric alcohol (c); and wherein the maleimide group-containing monomer (a) of the copolymer (B) is a tetrahydrophthalmaleimide(meth)acrylate represented by formula (1): wherein R represents hydrogen atom or methyl group; and wherein the amount of photopolymerization initiator (F) is in the range of 0.1 to 20 parts by weight per 100 parts by weight of the total solids content of hydroxyl-containing resin (A), copolymer (B), and curing agent (C).