Patent ID: 8093331

Claim:
A thermally conductive silicone rubber composition comprising: (A) an organopolysiloxane with the exception of below-given components (C) and (E); (B) a thermally conductive filler; (C) an organopolysiloxane a selected from (i) an organopolysiloxane represented by the following general formula: [R 1 a R 2 (3−a) SiO(R 1 b R 2 (2−b) SiO) m (R 2 2 SiO) n ] c SiR 2 [4−(c+d)] (OR 3 ) d wherein R 1 is a univalent hydrocarbon group with an aliphatic, unsaturated bonds, R 2 may designate the same or different univalent hydrocarbon groups that do not have aliphatic, unsaturated bonds, R 3 designates an alkyl group, alkoxyalkyl group, alkenyl group, or an acyl group; “a” is an integer between 0 and 3, “b” is 1 or 2, “c” is an integer between 1 and 3, “d” is an integer between 1 and 3; “(c+d)” is an integer between 2 and 4, “m” is an integer that is equal to or greater than 0, and “n” is an integer that is equal to or greater than 0; when “a” is 0, then “m” is an integer that is equal to or greater than 1; (ii) an organopolysiloxane represented by the following general formula: R 4 3 SiO(R 4 2 SiO) p R 4 2 Si—R 5 —SiR 4 (3−d) (OR 3 ) d wherein R 3 is the same defined above, R 4 represents the same or different univalent hydrocarbon groups, R 5 represents an oxygen atom or a bivalent hydrocarbon group, “p” is an integer between 100 and 500, and “d” is the same defined above; or (iii) a mixture of two or more of the above constituents (i) and (ii); (D) a curing agent; and (E) an organopolysiloxane composed of the following units: SiO 4/2 , R 1 R 2 2 SiO 1/2 , and R 2 3 SiO 1/2 wherein R 1 and R 2 are the same as defined above, with the proviso that component (E) is used in an amount of 2 to 10 mass % per sum of components (A) and (E).