Patent ID: 7844153

Claim:
An active energy ray-curable organopolysiloxane resin composition comprising: (A) 100 parts by weight of an epoxy-containing organopolysiloxane resin represented by the average siloxane unit formula: (R 1 R 2 R 3 SiO 1/2 ) a (R 4 R 5 SiO 2/2 ) b (R 6 SiO 3/2 ) c (SiO 4/2 ) d (1) wherein R 1 , R 2 , R 3 , R 4 , R 5 , and R 6 are organic groups selected from C 1 to C 6 monovalent aliphatic hydrocarbon groups, C 6 to C 10 monovalent aromatic hydrocarbon groups, and epoxy-containing monovalent hydrocarbon groups, with siloxane units having epoxy-containing monovalent hydrocarbon groups accounting for 2 to 50 mol % per molecule and 15 mol % or more of all the organic groups represented by C 6 to C 10 monovalent aromatic hydrocarbon groups, a+b+c+d=1, 0≦a<0.4, 0<b<0.5, 0<c<1, 0≦d<0.4, and 0.1≦b/c≦0.3, (B) 0.05 to 20 parts by weight of a photo acid generator, (C) 0.01 to 20 parts by weight of a photosensitizer or a photo-radical generator, and (D) 0 to 5,000 parts by weight of an organic solvent.