Patent ID: 8158265

Claim:
An addition-curable silicone composition, comprising: A: a diorganopolysiloxane having a structure represented by a formula (1) shown below: wherein R 1 represents an aliphatic unsaturated group, R 2 represents identical or different, unsubstituted or substituted monovalent hydrocarbon groups, Ar represents a phenyl group, and n represents an integer of 1 or greater, B: an organosilicon compound containing at least two hydrogen atoms bonded to silicon atoms per molecule, and containing no aliphatic unsaturated groups, wherein 30 to 100 mol % of the units of said organohydrogenpolysiloxane are methylhydrogen siloxane units, said organosilicon compound component B being an organohydrogenpolysiloxane represented by an average composition formula (2) shown below: R 3 a H b SiO (4-a-b)/2 (2) wherein R 3 represents identical or different, unsubstituted or substituted silicon atom-bonded monovalent hydrocarbon groups other than aliphatic unsaturated groups, and a and b represent positive numbers that satisfy 0.7≦a≦2.1, 0.001≦b≦1.0 and 0.8≦a+b≦3.0, in an amount that is sufficient to cure the composition in presence of a hydrosilylation catalyst described below, and C: a platinum group metal-based hydrosilylation catalyst.