Patent ID: 7521813

Claim:
A silicone rubber composition comprising (A) an organopolysiloxane containing at least two aliphatic unsaturated bonds in a molecule and having a viscosity of 10 to 1,000,000 mPa·s at 25° C., (B) an organopolysiloxane of resin structure comprising SiO 2 units, R 3 n R 4 p SiO 0.5 units and R 3 q R 4 r SiO 0.5 units wherein R 3 is vinyl or allyl, R 4 is a monovalent hydrocarbon group free of aliphatic unsaturation, n is 2 or 3, p is 0 or 1, n+p=3, q is 0 or 1, r is 2 or 3, q+r=3, (C) an organohydrogenpolysiloxane having at least two silicon atom-bonded hydrogen atoms in a molecule, and (D) a platinum group metal catalyst, component (B) being present in an amount of 20 to 70% by weight based on the total weight of components (A) and (B).