A polysiloxane composition

A composition, which contains:

• a component (A), that is an organopolysiloxane, preferably a component (A-1) that is an organopolysiloxane having two or more alkenyl groups per molecule;
• optional a component (B) that is an organohydrogenpolysiloxane having two or more hydrogen atoms directly bonded to silicon atoms and is contained in such an amount that the number of moles of hydrogen atoms directly bonded to silicon atoms in the component (B) is 0.1 to 5.0 times the number of moles of alkenyl groups derived from the component (A-1);
• a component (C) that is a heat conductive filler,
• wherein the filling rate of the heat conductive filler is greater than or equal to 0.80, preferably greater than or equal to 0.84, preferably greater than or equal to 0.88, preferably greater than or equal to 0.89, preferably greater than or equal to 0.90;
• optional a component (D) that is a platinum group metal-based curing catalyst having a platinum group metal element content of 0.1 to 1,000 ppm relative to the component (A-1) based on mass,
• a component (E-1) that is an alkoxysilane compound shown by the following formula (1);
• and
• in the formula (1)
• each R1 independently represents an alkyl group having 1 to 3 carbon atoms, preferably methyl, ethyl,
• each R2 independently represents an unsubstituted or substituted hydrocarbon group having 1 to 3 carbon atoms, preferably methyl, ethyl,
• each R3 independently represents an alkyl group having 1 to 6 carbon atoms, preferably an alkyl group having 1 to 3 carbon atoms, more preferably methyl, ethyl,
• a represents an integer of 1 to 3, and b represents an integer of 0 to 2, provided that a+b is an integer of 1 to 3,
• a component (E-2) that is a polysiloxane represented by the following general formula (2),
• in the formula (2),
• each R1 independently represents a hydrocarbon group with 1-6 carbon atoms, preferably s an alkyl or alkenyl group having 1 to 3 carbon atoms, preferably methyl, ethyl, propyl, vinyl, more preferably methyl;
• each R2 independently represents —OH or —(CH2)pOH, p is an integer from 1 to 3, preferably hydroxyl;
• m≤50, more preferably m≤20, more preferably 6≤m≤18;
• n is an integer, preferably n is 1-3, more preferably n is 1.