Thermosetting coating composition comprising a hydroxy acrylate ester copolymer and N-acylpolylactam or N-acylpolyimide

Claim 1

A thermosetting coating composition comprising (A) 100 parts by weight of a copolymer obtained by copolymerizing (a) 5 to 40% by weight of at least one unsaturated compound containing a hydroxyl group selected from the group consisting of hydroxyalkyl acrylates, hydroxyalkyl methacrylates and acrylic and methacrylic esters of glycols, glycerine, trimethylol propane and pentaerythritol and (b) 60 and 95% by weight of an unsaturated compound copolymerizable with said compound (a) and being at least one member selected from the group consisting of styrene type monomers, alkyl acrylates, alkyl methacrylates, vinyl acetate, acrylonitrile and acrylamide, said copolymer (A) having a number average molecular weight of 2,000 to 150,000 and (B) 5 to 40 parts by weight of at least one member selected from the group consisting of an N-acylpolylactam compound represented by the general formula ##STR11## wherein R is an alkylene group having 2 to 12 carbon atoms, which may include 1 to 2 nitrogen or oxygen atoms, or may contain locally an unsaturated linkage, a di- to tetra-valent benzene nucleus, which may have a substituent on the benzene nucleus, or a di- to trivalent heterocyclic residue having 3 to 15 carbon atoms; R' stands for an alkylene group having 1 to 11 carbon atoms; and n is an integer of 2 to 4, an N-acylopolyimide compound represented by the general formula ##STR12## wherein R and n are as defined above and R" stands for an alkylene group having 1 to 11 carbon atoms or a divalent benzene nucleus, and mixtures thereof.