Patent ID: 7279224

Claim:
A heat conductive composite sheet comprising: (a) a heat softening, heat conductive layer comprising a silicone resin and a heat conductive filler, wherein said silicone resin is at least one selected from the group consisting of: D 1 m T p D 2 n wherein D 1 represents a (CH 3 ) 2 SiO unit, T represents a (C 6 H 5 )SiO 3/2 unit, D 2 represents a (CH 3 )(CH 2 ═CH)SiO unit, the molar ratio (m+n)/p is within a range from 0.25 to 4.0, and the molar ratio (m+n)/m is within a range from 1.0 to 4.0; M l D 1 m T p D 2 n wherein M represents a (CH 3 ) 3 SiO 1/2 unit, D 1 represents a (CH 3 ) 2 SiO unit, T represents a (C 6 H 5 )SiO 3/2 unit, D 2 represents a (CH 3 )(CH 2 ═CH)SiO unit, the molar ratio (m+n)/p is within a range from 0.25 to 4.0, the molar ratio (m+n)/m is within a range from 1.0 to 4.0, and the molar ratio 1/(m+n) is within a range from 0.001 to 0.1; and M l D 1 m Q q D 2 n wherein M represents a (CH 3 ) 3 SiO 1/2 unit, D 1 represents a (CH 3 ) 2 SiO unit, Q represents SiO 4/2 , D 2 represents a (CH 3 )(CH 2 ═CH)SiO unit, the molar ratio (m+n)/q is within a range from 0.25 to 4.0, the molar ratio (m+n)/m is within a range from 1.0 to 4.0, and the molar ratio 1/(m+n) is within a range from 0.001 to 0.1, (b) a heat conductive silicone rubber layer comprising a heat conductive filler; wherein at least the surface of the layer (a) opposite to the layer (b) is capable of melting at a temperature that ranges from 40° C. to 100° C.