Patent ID: 8324313

Claim:
A thermally conductive resin composition comprising: (a) a matrix component, (b) a larger-diameter thermally conductive inorganic powder having a specific surface area of 0.06 to 1.0 m 2 /g, and (c) a smaller-diameter thermally conductive inorganic powder having a pre-treatment specific surface area of greater than 1.0 to 20 m 2 /g, a surface of the small-diameter thermally conductive inorganic powder of the component (c) being treated with a silane compound represented by R(CH 3 ) a Si(OR′) 3-a , wherein R is an unsubstituted or substituted organic group having 6 to 20 carbon atoms, R′ is an alkyl group having 1 to 4 carbon atoms, and a is 0 or 1, or a partially hydrolyzed product thereof, and an amount thereof being smaller than an amount necessary to coat an entire surface area of the smaller-diameter thermally conductive inorganic powder, a proportion of a surface area of the larger-diameter thermally conductive inorganic powder of the component (b) being 10% or less of a total surface area of the larger-diameter thermally conductive inorganic powder of the component (b) and the smaller-diameter thermally conductive inorganic powder of the component (c), and the thermally conductive resin composition having a thermal conductivity of 0.8 W/m·K or greater.