Patent ID: 8912132

Claim:
A thermally conductive silicone grease composition comprising the following components: (A) 100 parts by mass of an organopolysiloxane which is liquid at 25° C. and is represented by the following average compositional formula: R 1 a SiO (4-a)/2 where, R 1 is a monovalent hydrocarbon group and “a” is a number ranging from 1.8 to 2.2, wherein component (A) comprises an organopolysiloxane (A 1 ) that is free of aryl groups and organopolysiloxane (A 2 ) that contains aryl groups, and wherein the content of constituent (A 2 ) in component (A) is in the range of 10 to 50 mass %; (B) 800 to 6,000 parts by mass of a thermally conductive filler composed of constituents (B 1 ) to (B 3 ) given below, wherein: constituent (B 1 ) is spherical aluminum oxide powder with an average particle diameter ranging from 15 to 55 μm, in an amount of 40 to 80 mass % of component (B); constituent (B 2 ) is spherical aluminum oxide powder with an average particle diameter ranging from 2 to 10 μm, in an amount of 5 to 45 mass % of component (B); constituent (B 3 ) is aluminum oxide powder with an average particle diameter not exceeding 1 μm, in an amount of 5 to 25 mass % of component (B); and (C) 10 to 300 parts by mass of an organopolysiloxane represented by the following general formula: where, R 1 designates same or different monovalent hydrocarbon groups; X designates identical or different monovalent hydrocarbon groups or an alkoxysilyl-containing group of the following general formula: —R 2 —SiR 1 b (OR 3 ) (3-b) where, R 1 is the same as defined above, R 2 is an oxygen atom or an alkylene group, R 3 is an alkyl group; and “b” is an integer from 0 to 2; and “m” and “n” are integers equal to or greater than 0.