Patent ID: 8633276

Claim:
A thermally conductive silicone composition comprising: (A) 100 parts by mass of a dimethylpolysiloxane capped at both molecular terminals with dimethylvinylsiloxy groups having a viscosity of from 2,000 to 10,000 mPa·s at 25° C.; (B) 400 to 3,500 parts by mass of a thermally conductive filler; (C) 0.1 to 10 parts by mass of a fine silica powder; (D) an organopolysiloxane represented by the general formula given below and having a viscosity of less than 500 mPa·s at 25° C.: R 1 3 SiO(R 1 2 SiO) m (R 1 R 3 SiO) n R 1 2 Si—X—SiR 1 (3-a) (OR 2 ) a wherein X represents an oxygen atom or a bivalent hydrocarbon group having 2 to 10 carbon atoms; R 1 represents identical or different monovalent hydrocarbon groups which are free of unsaturated aliphatic bonds; R 2 represents groups selected from alkyl groups, alkoxyalkyl groups, alkenyl groups, or acyl groups; R 3 is represented by the following general formula: —X—SiR 1 (3-b) (OR 2 ) b , wherein X, R 1 , and R 2 are the same as defined above; and “b” is an integer ranging from 1 to 3; “a” is an integer ranging from 0 to 3; “m” is an integer equal to or greater than 0; and “n” is an integer equal to or greater than 0; however, when “a” is equal to 0, “n” is an integer equal to or greater than 1, wherein component (D) is used in an amount of 0.005 to 10 parts by mass per 100 parts by mass of component (B); and (E) a silane compound of the following general formula: R 4 (4-c) Si(OR 2 ) c wherein R 4 is a monovalent hydrocarbon group; R 2 is the same as defined above; and “c” is an integer ranging from 1 to 3, wherein component (E) is used in an amount of 0.005 to 10 parts by mass per 100 parts by mass of component (B).