Patent ID: 8754165

Claim:
A heat-conductive silicone grease composition that will increase its viscosity with moisture at room temperature, comprising (A) 1 to 40 parts by weight of an organopolysiloxane capped with trialkoxysilyl at both ends and having a viscosity of 0.1 to 1,000 Pa·s at 25° C., (B) 60 to 99 parts by weight of an organopolysiloxane having the general formula (1): wherein R 1 is each independently a substituted or unsubstituted monovalent hydrocarbon radical, R 2 is each independently an alkyl, alkoxyalkyl, alkenyl or acyl radical, n is an integer of 5 to 100, and a is an integer of 1 to 3, the sum of components (A) and (B) being 100 parts by weight, (C) 100 to 2,000 parts by weight of a heat-conductive filler having a heat conductivity of at least 10 W/m° C., and (D) 0.1 to 20 parts by weight of a condensation catalyst, wherein the viscosity of said composition as prepared is 50 to 250 Pa·s at 25° C. and wherein when said heat-conductive silicone grease composition increases its viscosity at a temperature of 23±2° C. and a relative humidity (RH) of 50±5% for 7 days, the viscosity corresponds to a hardness of 15 to 60 units as measured by an Asker hardness tester.