Patent ID: 7771794

Claim:
An active energy ray-curable organopolysiloxane resin composition comprising: (A) 100 parts by weight of an epoxy-containing organopolysiloxane resin represented by the following siloxane unit formula (1): (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) where R 1 , R 2 , R 3 , R 4 , R 5 , and R 6 are organic groups selected from univalent aliphatic hydrocarbon groups with 1 to 6 carbon atoms, univalent aromatic hydrocarbon groups with 6 to 10 carbon atoms, and epoxy-containing univalent hydrocarbon groups, wherein in one molecule the siloxane units with epoxy-containing univalent hydrocarbon groups constitute 2 to 50 mole %, the univalent aromatic hydrocarbon groups with 6 to 10 carbon atoms constitute more than 15 mole % of all organic groups, and where the following conditions are satisfied: a+b+c+d=1; “a” on average satisfies the following condition; 0≦a<0.4; “b” on average satisfies the following condition; 0<b<0.5; “c” on average satisfies the following condition; 0<c<1; “d” on average satisfies the following condition; 0≦d<0.4; “b” and “c” are bound by the following condition; 0.01≦b/c≦0.3; and wherein the total content of alkoxy groups and hydroxyl groups on silicon atoms of the epoxy-containing organopolysiloxane resin is no more than 2 mole % of all substituents on silicon atoms; (B) 0.05 to 20 parts by weight of a photopolymerization initiator; and (C) 0 to 5000 parts by weight of an organic solvent.