Heat dissipating silicone grease compositions
AssigneeShin-Etsu Chemical Co., Ltd.
InventorsNobuaki Matsumoto, Kunihiro Yamada, Kei Miyoshi, Ikuo Sakurai, Kenichi Isobe
Life of this patent
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Abstract
A silicone grease composition comprising 3-30 wt % of an organopolysiloxane and 60-96.9 wt % of a heat conductive filler is diluted with a least volatile isoparaffin having a boiling point of 260-360° C. Despite a heavy loading of heat conductive filler, the grease composition is easily applicable to heat sinks as a thin uniform coating. The composition is drastically increased in shelf stability at room temperature, easy to handle, and provides for good heat dissipation.
Claims20
A heat dissipating silicone grease composition comprising, in % by weight,
- (A) 0 to 30% of an organopolysiloxane represented by the general formula (1):
- R1aSiO(4−a)/2 (1)
- wherein R1 is at least one radical selected from substituted or unsubstituted monovalent hydrocarbon radicals of 1 to 18 carbon atoms, and “a” is a positive number from 1.8 to 2.2, and having a kinematic viscosity of 50 to 500,000 mm2/s at 25° C.,
- (B) 0 to 30% of an organopolysiloxane represented by the general formula (2):
- wherein R2 is each independently a substituted or unsubstituted monovalent hydrocarbon radical, R3 is each independently an alkyl, akoxyalkyl, alkenyl or acyl radical, n is an integer of 5 to 100, and “b” is an integer of 1 to 3, the sum of components (A) and (B) being in a range of 3 to 30%,
- (C) 60 to 96.9% of a heat conductive filler having a heat conductivity of at least 10 W/m° C.,
- (D) 0.1 to 10% of a least volatile isoparaffin having a boiling point 270 to 350° C., in which components (A) and (B) are dispersible or dissolvable,
- the sum of components (A) to (D) being 100%.
A heat dissipating silicone grease composition comprising, in % by weight,
- (A) 0 to 30% of an organopolysiloxane represented by the general formula (1):
- R1aSiO(4−a)/2 (1)
- wherein R1 is at least one radical selected from substituted or unsubstituted monovalent hydrocarbon radicals of 1 to 18 carbon atoms, and “a” is a positive number from 1.8 to 2.2, and having a kinematic viscosity of 50 to 500,000 mm2/s at 25° C.,
- (B) 0 to 30% of an organopolysiloxane represented by the general formula (2):
- wherein R2 is each independently a substituted or unsubstituted monovalent hydrocarbon radical, R3 is each independently an alkyl, akoxyalkyl, alkenyl or acyl radical, n is an integer of 5 to 100, and “b” is an integer of 1 to 3, the sum of components (A) and (B) being in a range of 3 to 30%,
- (C) 60 to 96.9% of a heat conductive filler having a heat conductivity of at least 10 W/m° C.,
- (D) 0.1 to 10% of a least volatile isoparaffin having a boiling point of 270 to 350° C., in which components (A) and (B) are dispersible or dissolvable;
- and
- (E) 0.1 to 10 parts by weight of an organosilane having the general formula (3):
- R4cR5dSi(OR6)4−c−d (3)
- wherein R4 is a substituted or unsubstituted alkyl radical of 6 to 20 carbon atoms, R5 is a substituted or unsubstituted monovalent hydrocarbon radical of 1 to 20 carbon atoms, R6 is an alkyl radical of 1 to 6 carbon atoms, c is an integer of 1 to 3, d is an integer of 0 to 2, and c+d is an integer of 1 to 3, or a partial hydrolytic condensate thereof, per 100 parts by weight of components (A) to (D) combined;
- wherein the sum of components (A) to (E) is 100%.
Dependencies are inferred from the claim text.