Patent ID: 8895664

Claim:
A curable composition, comprising: (A) an organopolysiloxane, which comprises an organopolysiloxane having an average composition formula of Formula 8, and which comprises an aliphatic unsaturated bond and an aryl group and of which a molar ratio (Ar/Si) of aryl groups (Ar) binding to silicon atoms with respect to a total of silicon atoms (Si) is from 0.3 to 1.1; (B) an organopolysiloxane, which comprises an aryl group and a hydrogen atom binding to a silicon atom and of which a molar ratio (Ar/Si) of aryl groups (Ar) binding to silicon atoms with respect to a total of silicon atoms (Si) is from 0.3 to 1.2; and (C) an inorganic particle, of which the surface is treated with an organopolysiloxane which has an average composition formula of Formula 17 and of which a molar ratio (Ar/Si) of aryl groups (Ar) binding to silicon atoms with respect to a total of silicon atoms (Si) is from 0.1 to 1.8: (R 1 R 2 2 SiO 1/2 ) a (R 3 R 4 SiO 2/2 ) b (R 5 SiO 3/2 ) c (SiO 2 ) d [Formula 8] where R 1 is a monovalent hydrocarbon group having 2 or more carbon atoms, R 2 is an alkyl group having 1 to 4 carbon atoms, R 3 and R 4 are each independently an alkyl group having 1 to 20 carbon atoms, an alkenyl group having 2 to 20 carbon atoms or an aryl group having 6 to 25 carbon atoms, R 5 is an alkyl group having 1 to 20 carbon atoms or an aryl group having 6 to 25 carbon atoms, with the proviso that at least one of R 1 , R 3 and R 4 is an alkenyl group; a is a positive number, b is a positive number, c is a positive number, d is 0 or a positive number, b/a is 5 or more, and b/c is 5 or more, (R 3 SiO 1/2 ) a (R 2 SiO 2/2 ) b (RSiO 3/2 ) c (SiO 2 ) d [Formula 17] where R's are independently hydrogen, a hydroxyl group, an alkoxy group, an epoxy group, a (meth)acryloyl group, an isocyanate group or a monovalent hydrocarbon group, with the proviso that at least one of R's is an aryl group; and a, b, c and d are each independently 0 or a positive number, with the proviso that the sum thereof (a+b+c+d) is 1, and a is 0 to 0.3, b is 0 to 1, c is 0 to 0.8, and d is 0 to 0.8.