Toyo Ink Sc Holdings Co., Ltd.

Toyochem Co., Ltd.

Kenji Andou

Kaori Sakaguchi

Toshiichi Sawaguchi

Naohiro Tanaka

Hidenobu Kobayashi

The present invention provides a thermally conductive insulating sheet having appropriate fluidity upon being heated and pressurized, and free from of the possibility of a material leaking to the outside beyond the original size of the sheet. The thermally conductive insulating sheet according to the present invention contains an uncured material and/or a semi-cured material of a binder resin (R) which is a thermosetting resin. In the present invention, a complex viscosity in a temperature range of 100-200&#xb0; C. is 10,000-150,000 Pa&#xb7;s, a ratio (&#x3b1;/&#x3b2;) of the maximum value (&#x3b1;) to the minimum value (&#x3b2;) of the complex viscosity in said temperature range is 1.0-4.0, and the flow value is 90-100%. Flow value(%)=W2/W1&#xd7;100.

Thermally conductive insulating sheet, and composite member

A composite member (1) satisfies the following expressions. X/(E&#xd7;|CTE(B)&#x2212;CTE(A)|)&#x2265;50, X/(E&#xd7;|CTE(B)&#x2212;CTE(C)|)&#x2265;50, Y/|CTE(B)&#x2212;CTE(A)|&#xd7;L(BA)&#x2264;50, and Y/|CTE(B)&#x2212;CTE(C)|&#xd7;L(BC)&#x2265;50. X: shear bond strength (MPa) between the heat dissipating base substrate and heat generating member, Y: fracture elongation of the thermoconductive insulating adhesive film, E: modulus of elasticity (MPa) of the thermoconductive insulating adhesive film, CTE(A): linear expansion coefficient (&#xb0; C.) of the heat dissipating base substrate, CTE(B): linear expansion coefficient (&#xb0; C.) of the thermoconductive insulating adhesive film, CTE(C): linear expansion coefficient (&#xb0; C.) of the material of the surface of the heat generating member in contact with the thermoconductive insulating adhesive film, L(BA): initial contact length (m) between the thermoconductive insulating adhesive film and the heat dissipating base substrate, and L(BC): initial contact length (m) between the thermoconductive insulating adhesive film and the heat generating member.

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Tokyo, Japan

Kenji Andou