Patent ID: 8168730

Claim:
A curable silicone rubber composition, comprising: (A) an organopolysiloxane containing two or more aliphatic unsaturated bonds within each molecule, having a viscosity at 25° C. within a range from 10 to 100,000 mm 2 /s, and containing either one of, or both, a phenyl group and a cyclohexyl group, (B) an organopolysiloxane with a three dimensional network structure comprising SiO 2 units and (R 1 ) 3 SiO 0.5 units, wherein, each R 1 represents, independently, a vinyl group, an allyl group, or a monovalent hydrocarbon group that contains no aliphatic unsaturated bonds, provided one or more of all R 1 groups within this component (B) represent, independently, a phenyl group or a cyclohexyl group, wherein the quantity of vinyl groups is within a range from 1 to 30 mol % of all the R 1 groups within the component B, (C) an organohydrogenpolysiloxane, and (D) a platinum group metal-based catalyst, wherein said component (B) exists in a quantity that represents from 20 to 80% by mass of a combination of said component (A) and said component (B), and wherein said component (A) is represented by formula (1) shown below: wherein R 2 groups represent identical or different unsubstituted or substituted monovalent hydrocarbon groups, R 3 groups represent identical or different unsubstituted or substituted monovalent hydrocarbon groups other than a phenyl group or cyclohexyl group, each R 4 group represents, independently, a phenyl group or a cyclohexyl group, and L and m each represent either 0 or a positive integer, although when m =0, at least one of all R 2 groups is a phenyl group or a cyclohexyl group, and wherein L and m in formula (1) are integers that satisfy the formula: 0 <L+m≦1,200 and the formula: 0 ≦m/(L+m) ≦0.4.