To obtain ultraviolet curable coating resin compositions capable of obtaining excellent mar resistance even in long-term outdoor use and, in addition, excellent in the adhesion and cracking resistance of coated films.
Ultraviolet curable coating resin compositions are obtained by incorporating 2-10 pts.wt. photopolymerization initiator and 2-20 pts.wt. ultraviolet absorber 2-10 into 100 pts.wt. coated film-forming component comprising (a) 10-70 wt.% mono- or difunctional monomer having an ether bond and one to two acryloyloxy groups per molecule and a molecular weight of 130-700, (b) 5-60 wt.% aliphatic urethane acrylate oligomer, (c) 10-30 wt.% methyl methacrylate polymer having a molecular weight of 10,000-200,000 and, if necessary or desired, (d) 5-50 polyfunctional monomer having three or more acryloyloxy groups per molecule and having a molecular weight of 250-700.