Thermally conductive composition, thermally conductive sheet obtained from same, and production method therefor

Abstract

The present invention provides a thermally conductive composition having a high thermal conductivity with the compressive load and the degree of plasticity being kept low, a thermally conductive sheet using the thermally conductive composition, and a method for producing the thermally conductive sheet. The thermally conductive composition contains a matrix resin (component A) made of a thermosetting resin, a curing catalyst, and thermally conductive particles (component B). 1500 to 3000 parts by mass of the component B is blended with respect to 100 parts by mass of the component A. The component B includes the following components B1, B2, B3, and B4. The component B includes, relative to the total amount of the component B, 10 to 20 mass % of aluminum nitride with a median diameter (D50) of less than 20 μm (component B-1); 3 to 9 mass % of aluminum nitride with D50 of 20 μm or more (component B-2); 50 to 60 mass % of alumina with D50 of 60 to 80 μm (component B-3); and 11 to 37 mass % of alumina with D50 of less than 60 μm (component B-4). The blending ratio (B-1)/(B-2) of the component B-1 to the component B-2 in terms of mass is 1.2 to 3.

Dependencies are inferred from the claim text.