| 主权项 |
1. A hard coating composition for a metal substrate consisting of:
a film-forming resin component consisting of (i) a urethane (meth)acrylate obtained by reacting a polyisocyanate compound, a polyol, and a (meth)acrylate monomer having a hydroxyl group, and (ii) an active energy ray-curable component having an alicyclic structure, a photo-polymerization initiator, and a solvent, wherein the polyisocyanate compound is dicyclohexylmethane diisocyanate, the polyol is at least one selected from the group consisting of 1,4-cyclohexanediol and 2,2′-bis(4-hydroxycyclohexyl)propane, the amount of the photo-polymerization initiator is within a range of 1 to 3 parts by mass with respect to 100 parts by mass of the urethane (meth)acrylate, the amount of the solvent is within a range of 0.001% to 40% by mass with respect to the total of the coating composition; the active energy ray-curable component is at least one selected from the group consisting of cyclohexyl(meth)acrylate, t-butylcyclohexyl(meth)acrylate, dicyclohexylpentanyl acrylate, tricyclodecane dimethanol (meth)acrylate, isobornyl (meth)acrylate, dimethyloltricyclodecane di(meth)acrylate, and dimethylol dicyclopentane diacrylate; and the amount of the active energy ray-curable component is within a range of 5% to 60% by mass with respect to the total of the film-forming resin component. |
