A polysiloxane composition

A treated filler (CE) obtained by mixing a component (C) thermally conductive filler with a component (E-2);

• wherein the component (E-2) is a titanate compound represented by the following general formula (2) and/or an oligomer having a degree of polymerization of 2-5,
• wherein R4 is a hydrocarbon group containing 6-30 carbon atoms, and contains at least one carbon-carbon unsaturated group;
• wherein the number of carbon atoms is between 6-24, more preferably between 10-20, more preferably between 16-20;
• wherein the component (E-2) contains 1-3 ethylenic bonds, preferably contains 1-2 ethylenic bonds, more preferably contains 1 ethylenic bond;
• wherein R4COO— is preferably an oleic acid group;
• wherein R6 is a hydrocarbon group containing 1-5 carbon atoms, preferably between 1-4 carbon atoms, more preferably methyl, ethyl, ethylene, allyl, propyl, isopropyl, butyl, isobutyl;
• more preferably propyl, isopropyl;
• wherein m is 1 or 2, preferably m is 2;
• and
• wherein the mixing conditions are 100-140° C., 32-70 min.

A method for treating a component (C) thermally conductive filler, comprising:

• providing a component (C) thermally conductive filler and a component (E-2);
• wherein the component (E-2) is a titanate compound represented by the following general formula (2) and/or an oligomer having a degree of polymerization of 2-5,
• wherein R4 is a hydrocarbon group containing 6-30 carbon atoms, and contains at least one carbon-carbon unsaturated group;
• wherein the number of carbon atoms is between 6-24, more preferably between 10-20, more preferably between 16-20;
• wherein the component (E-2) contains 1-3 ethylenic bonds, preferably contains 1-2 ethylenic bonds, more preferably contains 1 ethylenic bond;
• wherein R4COO— is preferably an oleic acid group;
• wherein R6 is a hydrocarbon group containing 1-5 carbon atoms, preferably between 1-4 carbon atoms, more preferably methyl, ethyl, ethylene, allyl, propyl, isopropyl, butyl, isobutyl;
• more preferably propyl, isopropyl;
• wherein m is 1 or 2, preferably m is 2;
• mixing the component (C) with the component (E-2);
• and
• wherein the mixing conditions are 100-140° C., 32-70 min;
• preferably 100-140° C., 40-70 min;
• preferably 100-130° C., 30-65 min;
• more preferably 115-125° C., 35 −60 min;
• more preferably 118-122° C., 35 −60 min.

A composition, comprising:

• a component (A), that is an organopolysiloxane, preferably a component (A-1) that is an organopolysiloxane having two or more alkenyl groups per molecule;
• an 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 treated filler (CE), wherein the treated filler (CE) comprises a component (C) thermally conductive filler and a component (E-2);
• wherein the component (E-2) is a titanate compound represented by the following general formula (2) and/or an oligomer having a degree of polymerization of 2-5,
• wherein R4 is a hydrocarbon group containing 6-30 carbon atoms, and contains at least one carbon-carbon unsaturated group;
• wherein the number of carbon atoms is between 6-24, more preferably between 10-20, more preferably between 16-20;
• wherein the component (E-2) contains 1-3 ethylenic bonds, preferably contains 1-2 ethylenic bonds, more preferably contains 1 ethylenic bond;
• wherein R4COO— is preferably an oleic acid group;
• wherein R6 is a hydrocarbon group containing 1-5 carbon atoms, preferably between 1-4 carbon atoms, more preferably methyl, ethyl, ethylene, allyl, propyl, isopropyl, butyl, isobutyl;
• more preferably propyl, isopropyl;
• wherein m is 1 or 2, preferably m is 2;
• wherein the filling amount of the treated filler (CE) 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;
• and
• 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.