Abstract: To provide a polyorganosiloxane composition whose cured product has uniform good flame retardancy and good physical properties with less discoloring, for example, yellowing, and which has excellent temporal stability when stored. A flame-retardant polyorganosiloxane composition contains: (A) straight-chain polyalkylsiloxane having two or more alkenyl groups in one molecule and having a 10,000 to 1,000,000 mPa·s viscosity (25° C.); (B) resinoid polyorganosiloxane containing a Q unit and having 1.5 or more alkenyl groups on average, mass % of the component (B) being 30 to 80 mass % of the total of the components (A), (B); (C) polyorganohydrogensiloxane having three or more Si—H, an amount of the component (C) being such that Si—H/(total of the alkenyl groups in the components (A), (B)) becomes 1.0 to 3.0 moles; and (D) a catalytic amount of a hydrosilylation reaction catalyst, wherein the total content of phosphorus and an alkali metal is 20 mass ppm or less.

Abstract: A polyorganosiloxane composition for molding includes: (A) a straight-chain polyorganosiloxane having two or more alkenyl groups and having a viscosity (25° C.) of 10,000 to 500,000 mPa·s; (B) 30 to 80 mass % of a resinoid polyorganosiloxane including M, D, and Q units, at a molar ratio of a:b:c, on average (0.3?a?0.6, 0?b?0.1, 0.4?c?0.7, and a+b+c=1), and having two or more alkenyl groups; (C) an amount of a polyorganohydrogensiloxane having Si-bonded hydrogen atoms, an average degree of polymerization of 10 or more, a content of the Si-bonded hydrogen atoms of 5.0 mmol/g or more and 11.0 mmol/g or less, and a mass decrease rate up to 140° C. by TGA of 2.0 mass % or less so that an amount of the (Si-bonded hydrogen atoms/alkenyl groups) is 1.0 to 3.0 mol; and (D) a hydrosilylation reaction catalyst. A cured product excellent in mold release property is obtained and contamination of a metal mold is prevented.

Abstract: A polyorganosiloxane composition for molding includes: (A) a straight-chain polyorganosiloxane having two or more alkenyl groups and having a viscosity (25° C.) of 10,000 to 500,000 mPa·s; (B) 30 to 80 mass % of a resinoid polyorganosiloxane including M, D, and Q units, at a molar ratio of a:b:c, on average (0.3?a?0.6, 0?b?0.1, 0.4?c?0.7, and a+b+c=1), and having two or more alkenyl groups; (C) an amount of a polyorganohydrogensiloxane having Si-bonded hydrogen atoms, an average degree of polymerization of 10 or more, a content of the Si-bonded hydrogen atoms of 5.0 mmol/g or more and 11.0 mmol/g or less, and a mass decrease rate up to 140° C. by TGA of 2.0 mass % or less so that an amount of the (Si-bonded hydrogen atoms/alkenyl groups) is 1.0 to 3.0 mol; and (D) a hydrosilylation reaction catalyst. A cured product excellent in mold release property is obtained and contamination of a metal mold is prevented.

Abstract: The present invention provides a heat-curable silicone rubber composition capable of giving a stable and high antistatic property for a long time without degrading inherent properties of a silicone rubber, such as thermal stability. The heat-curable silicone rubber composition includes: (A) 100 parts by mass of a mixture of a polyorganosiloxane obtained by polymerization by using an alkali metal hydroxide as a polymerization catalyst and by neutralization, and a curing agent, and (B) 50 to 1000 ppm of an ionic substance containing an anion and a cation, and being a bis(trifluoromethanesulfonyl)imide as the anion.

Abstract: A heat-curable addition-reactive type silicone rubber composition which gives a molded article having excellent antistatic property, heat resistance, compression set property. The heat-curable addition-reactive type silicone rubber composition includes: (A) a mixture containing a heat curable addition-reactive silicone rubber and a curing agent, (B) an ionic liquid in an amount of 30 to 3000 ppm relative to 100 parts by mass of the component (A), wherein the curing agent is not included in the 100 parts by mass, (C) a heterocyclic compound containing nitrogen atoms in an amount of 30 to 3000 ppm relative to 100 parts by mass of the component (A), wherein the curing agent is not included in the 100 parts by mass.

Abstract: The present invention provides a heat curable addition-reactive type silicone rubber composition which gives a molded article having excellent antistatic property, heat resistance, compression set property. A heat curable addition-reactive type silicone rubber composition includes: (A) a mixture containing a heat curable addition-reactive silicone rubber and a curing agent, (B) an ionic liquid in an amount of 30 to 3000 ppm relative to 100 parts by mass of the component (A), wherein the curing agent is not included in the 100 parts by mass, (C) a heterocyclic compound containing nitrogen atoms in an amount of 30 to 3000 ppm relative to 100 parts by mass of the component (A), wherein the curing agent is not included in the 100 parts by mass.

Abstract: The present invention provides a heat curable silicone rubber composition capable of giving a stable and high antistatic property for a long time without degrading inherent properties of a silicone rubber, such as thermal stability. A heat curable silicone rubber composition includes: (A) 100 parts by mass of a mixture of a polyorganosiloxane obtained by polymerization by using an alkali metal hydroxide as a polymerization catalyst and by neutralization, and a curing agent, and (B) 50 to 1000 ppm of an ionic substance containing an anion and a cation, and being a bis (trifluoromethanesulfonyl) imide as the anion.

Abstract: The present invention provides a heat curable silicone rubber composition capable of obtaining a cured product having a good transparency and antistatic property. A heat curable silicone rubber composition includes: (A) 100 parts by mass of an organopolysiloxane, (B) 10 to 400 parts by mass of a silicone resin, (C) an organohydrogenpolysiloxane in an amount such that the number of the hydrogen atoms bonded to a silicon atom per one alkenyl group bonded to a. silicon atom in the component (A) and the component (B) is 1.0 to 10.0, (D) a silicone rubber base polymer containing a hydrosilylation reaction catalyst, and (E) 30 to 3000 ppm of an ionic liquid serving as an antistatic agent, wherein the ionic liquid of the component (E) is one in which a difference of a refractive index from a refractive index of a cured product of the silicone rubber base polymer is within the range of ±0.04.