Patent ID: 8138254

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) a composition 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; (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); and (F) a silane compound represented by the following general formula: R 6 R 7 f Si(OR 3 ) (3-f) {wherein R 3 is the same as defined above; R 6 is a substituent showing no affinity with respect to aforementioned component (A); R 7 is an alkyl group; “f” is 0 or 1}, wherein component (E) is contained in an amount of 2 to 10 mass % per sum of components (A) and (E), and wherein said component (F) is contained in an amount of from 0.01×M to 0.70×M, wherein M is a value according to the following formula: M = [ amount ⁢ ⁢ ⁢ of ⁢ ⁢ Component ⁢ ⁢ ( B ) ⁢ ⁢ ( g ) × BET-specific ⁢ ⁢ surface ⁢ ⁢ area ⁢ ⁢ of ⁢ ⁢ Component ⁢ ⁢ ( B ) ⁢ ⁢ ( m 2 ⁢ / ⁢ g ) ] ⁢ [ minimal ⁢ ⁢ surface ⁢ ⁢ area ⁢ ⁢ coated ⁢ with ⁢ ⁢ the ⁢ ⁢ Component ⁢ ⁢ ( F ) ⁢ ⁢ ( m 2 ⁢ / ⁢ g ) ] and M represents a required amount of component (F) to coat 100% of the entire surface of component (B).