Patent Number: 6,255,257

Title: Silicone grease composition

Abstract: A silicone grease composition having high thermal conductivity, comprising (A) 50 to 95 weight % of a mixture of an aluminum nitride powder .alpha. having an average particle size of 0.5 to 5 .mu.m and an aluminum nitride powder .beta. having an average particle size of 6 to 20 .mu.m, wherein the aluminum nitride powders .alpha. and .beta. are mixed so that the .alpha./(.alpha.+.beta.) ratio by weight is from 0.1 to 0.9 and the average particle size after mixing is from 1 to 10 .mu.m, (B) 5 to 15 weight % of organopolysiloxanes having a viscosity of from 50 to 50,000 cs at 25.degree. C. and represented by formula R.sup.1.sub.a SiO.sub.(4-a)/2, wherein R.sup.1 represents at least one group selected from saturated or unsaturated univalent hydrocarbon groups containing 1 to 18 carbon atoms and 1.8.ltoreq.a.ltoreq.2.2, and (C) 0 to 35 weight % of at least one inorganic compound powder having an average particle size of 0.5 to 100 .mu.m selected from the group consisting of zinc oxide, alumina, boron nitride and silicon carbide powders.

Inventors: Yamada; Kunihiro (Gunma-ken, JP), Takahashi; Takayuki (Gunma-ken, JP), Isobe; Kenichi (Gunma-ken, JP)

Assignee: Shin-Etsu Chemical Co., Ltd.

International Classification: C10M 169/00 (20060101); C10M 169/02 (20060101); C10M 107/50 (); C10M 113/08 ()

Expiration Date: 07/03/2018