Silicone elastomer composition and silicone elastomer

A silicone elastomer composition comprising:

• (A) an organopolysiloxane having in one molecule on average at least 0.1 silicon-bonded alkenyl groups;
• (B) an organopolysiloxane having in one molecule on average at least 2 silicon-bonded hydrogen atoms used in an amount such that the content of silicon-bonded hydrogen atoms contained in the composition ranges from 0.1 to 10 moles per 1 mole of silicon-bonded alkenyl groups contained in component (A);
• (C) a platinum group metal catalyst used in an amount such that in terms of weight units the content of platinum group metal is in the range of 0.01 to 1,000 ppm per total weight of the sum of components (A) and (B);
• (D) a thermally conductive filler used in an amount of 25 to 4,500 parts by weight per 100 parts by weight of component (A);
• (E) an organosiloxane represented by the following general formula:
• [R1aR2(3-a)SiO(R22SiO)m(R2R4SiO)n]bSiR2[4−(b+c)](OR3)c
• where R1 represents monovalent hydrocarbon groups having unsaturated aliphatic bonds;
• R2 represents same or different monovalent hydrocarbon groups which are free of unsaturated aliphatic bonds;
• R3 represents alkyl groups or alkoxyalkyl groups;
• R4 is a group represented by the following general formula:
• -A-SiR2d(OR3)(3-d)
• where “A” represents an oxygen atom or a bivalent hydrocarbon group having 2 to 10 carbon atoms;
• R2 and R3 are the same as defined above;
• and “d” is an integer from 0 to 2;
• “a” is an integer from 1 to 3;
• “b” is an integer from 1 to 3;
• “c” is an integer from 0 to 3;
• (b+c) is an integer from 1 to 4;
• “m” is an integer equal to or greater than 0;
• “n” is an integer equal to or greater than 0, but when “c” is 0, the value of “n” is an integer equal to or greater than 1 wherein component (E) is used in an amount of 0.005 to 10 parts by weight per 100 parts by weight of component (D);
• and
• (F) a silane compound represented by the following general formula:
• R5eSi(OR6)(4-e)
• where R5 represents same or different univalent hydrocarbon groups, epoxy-containing organic groups, methacrylic-containing organic groups, or acrylic-containing organic groups;
• R6 represents alkyl groups or alkoxyalkyl groups;
• and “e” is an integer from 1 to 3 wherein component (F) is used in an amount of 0.005 to 10 parts by weight per 100 parts by weight of component (D).