| abstract |
PROBLEM TO BE SOLVED: To provide an active energy ray-curable metal coating composition which has high adhesion to metal, has excellent chemical resistance, and forms a hardened film having high hardness. SOLUTION: The composition of the present invention comprises 30% by weight or more of (meth) acrylate having one or more hydroxyl groups and 70% by weight or less of monomer having one ethylenically unsaturated group in 150 to 150% by weight. Polymerized continuously at 350 ° C. to obtain a number average molecular weight of 1, 000 to 10,000 copolymer (a) is obtained by subjecting a monomer having at least one ethylenically unsaturated group and one carboxyl group to a hydroxyl group of the copolymer to an esterification reaction. The reactive diluent (B) is blended with the reactive resin (A). If a high-temperature continuous polymerization method is used for the above polymerization, a copolymer having a relatively high molecular weight and a low viscosity can be obtained, so that the curing shrinkage of the composition is reduced and the adhesion of the cured film to the substrate is improved. be able to. It is preferable to use a highly polar monomer as the reactive diluent. |