Patent ID: 8334054

Claim:
A heat conductive cured product having a substrate film and a separator film, said heat conductive cured product obtained by a processing comprising applying a heat conductive composition as a thin film to the substrate film which has been treated to have a silicone pressure-sensitive adhesive releasable surface with a modified silicone having a fluorinated substituent radical on the main chain selected from the group consisting of a perfluoroalkyl radical and a perfluoropolyether radical, and curing the composition, and the separator film which has been treated to have a releasable surface being attached to the surface of the heat conductive cured product remote from the substrate film, and said composition comprising, (a) 100 parts by volume of an organopolysiloxane having alkenyl radicals, (b) 50 to 1,000 parts by volume of a heat conductive filler, the filler comprising at least 30% by volume of aluminum powder based on the total volume of the filler, (c) an organohydrogenpolysiloxane in an amount to give a molar ratio of silicon-bonded hydrogen atoms in component (c) to alkenyl radicals in component (a) between 0.5 and 5.0, (d) a catalytic amount of a platinum group metal catalyst, (e) an effective amount of a reaction regulator, and (f) 50 to 500 parts by volume of a silicone resin comprising R 1 3 SiO 1/2 units and SiO 4/2 units wherein R 1 is a substituted or unsubstituted monovalent hydrocarbon radical free of aliphatic unsaturation, a molar ratio of R 1 3 SiO 1/2 units to SiO 4/2 units being between 0.5 and 1.5.