| CPC C09K 5/14 (2013.01) [C08K 3/22 (2013.01); C08K 3/36 (2013.01); C08K 2003/0812 (2013.01)] | 7 Claims |
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1. A thermally conductive grease, comprising:
a liquid olefin polymer; and
thermally conductive particles,
wherein
the liquid olefin polymer is a mixture of at least two ethylene α-olefin copolymers having a kinematic viscosity at 40° C. of less than 1,000 mm2/s and a kinematic viscosity at 40° C. of 1,000 mm2/s or more and the kinematic viscosity of the mixture at 40° C. is 10,000 mm2/s or less,
the thermally conductive grease comprises 400 to 2000 parts by mass of the thermally conductive particles based on 100 parts by mass of the liquid olefin polymer,
alumina particles with a median particle diameter of 0.1 to 5 μm constitute 5 to 80% by mass of 100% by mass of the thermally conductive particles, and other thermally conductive particles constitute 20 to 95% by mass of 100% by mass of the thermally conductive particles, and the other thermally conductive particles are thermally conductive particles with a median particle diameter of more than 5 μm,
the alumina particles with a median particle diameter of 0.1 to 5 μm have an irregular shape,
the alumina particles with a median particle diameter of 0.1 to 5 μm are surface treated with a silane coupling agent that is an alkoxysilane compound or a partial hydrolysate of the alkoxysilane compound, and the alkoxysilane compound is expressed by RaSi(OR′)4-a, where R represents a substituted or unsubstituted organic group having 6 to 12 carbon atoms, R′ represents an alkyl group having 1 to 4 carbon atoms, and a is 0 or 1, and the silane coupling agent is added in an amount of 0.01 to 10 parts by mass based on 100 parts by mass of the thermally conductive particles to perform the surface treatment,
and,
the thermally conductive grease has an absolute viscosity at 23° C. of 300 to 7000 Pa·s measured by a B-type viscometer using a T-E spindle at a rotational speed of 5 rpm.
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