Heat-conductive silicone rubber composition

A heat-conductive silicone rubber composition comprising:

• (A) 100 parts by weight of an organopolysiloxane containing an average of at least 0.1 alkenyl groups bonded to silicon atoms within each molecule and with a viscosity at 25° C. within a range from 50 to 100,000 mPa·s,
• (B) an organopolysiloxane containing an average of at least 2 hydrogen atoms bonded to silicon atoms within each molecule and with a viscosity at 25° C. within a range from 1 to 100,000 mPa·s, in a sufficient quantity to produce 0.1 to 3.0 mols of silicon atom-bonded hydrogen atoms within said constituent (B) per 1 mol of silicon atom-bonded alkenyl groups within said constituent (A),
• (C) 100 to 2,500 parts by weight of a heat-conductive filler,
• (D) an effective quantity of a platinum catalyst, and
• (E) 0.1 to 30 parts by weight per 100 parts by weight of said constituent (C) of a methylpolysiloxane with a hydrolyzable group and a vinyl group, as represented by a general formula (I):
• 11
• wherein, R1 represents a monovalent hydrocarbon group of 1 to 4 carbon atoms, R2 represents an alkoxy group or an acyloxy group of 1 to 4 carbon atoms, Z represents an oxygen atom or a bivalent hydrocarbon group of 2 to 10 carbon atoms, a represents 0, 1 or 2, m is an integer from 3 to 100, n is an integer from 0 to 50, the sum of m+n is an integer from 3 to 100, and A is a methyl group or a group represented by a formula -Z-Si(R1a)R2(3−a) where R1, R2, a and Z are as defined above, although in a case of n=0, A is a group represented by said formula -Z-Si(R1a)R2(3−a).