Abstract: A millable-type silicone rubber composition, including: (A) 100 parts by mass of an organopolysiloxane represented by following average composition formula (1), the organopolysiloxane having polymerization degree of 100 or more, wherein a content of a low molecular siloxane contained as an impurity and having a polymerization degree of 10 or less is less than 1,000 ppm; (B) 5 to 100 parts by mass of a treated silica treated with a vinyl group-containing alkoxysilane and/or a vinyl group-containing organosilazane, the treated silica having a hydrophobicity degree of 40 or more; and (C) an effective amount of a curing agent. This provides a millable-type silicone rubber composition that yields a silicone rubber cured product with: a total of low molecular siloxane components having polymerization degree of 10 or less of less than 1,000 ppm; a small change in plasticity degree of the silicone rubber compound; and a small compression set.

Abstract: A method for manufacturing granulated silica. The method includes granulating silica powders each having a primary particle size of 5 to 50 nm by use of water, and hydrophobizing each surface of the silica powders with a silicon atom-containing hydrophobizing agent before or simultaneously with the granulation step.

Abstract: Provided is a millable silicone rubber composition capable of yielding a silicone rubber (cured product) superior in heat resistance. The composition contains: (A) 100 parts by mass of an organopolysiloxane having at least two silicon atom-bonded alkenyl groups in one molecule, and having an average polymerization degree of not lower than 100; (B) 5 to 100 parts by mass of a reinforcing silica having a specific surface area of not smaller than 50 m2/g; (C) 0.01 to 10 parts by mass of a titanium oxide doped with a transition metal oxide of 0.01 to 5% by mass; (D) 0.01 to 10 parts by mass of a cerium oxide and/or a cerium hydroxide; and (E) 0.01 to 10 parts by mass of a curing agent.

Abstract: A method for manufacturing granulated silica. The method includes granulating silica powders each having a primary particle size of 5 to 50 nm by use of water, and hydrophobizing each surface of the silica powders with a silicon atom-containing hydrophobizing agent before or simultaneously with the granulation step.

Abstract: Provided is a millable silicone rubber composition capable of yielding a silicone rubber (cured product) superior in heat resistance. The composition contains: (A) 100 parts by mass of an organopolysiloxane having at least two silicon atom-bonded alkenyl groups in one molecule, and having an average polymerization degree of not lower than 100; (B) 5 to 100 parts by mass of a reinforcing silica having a specific surface area of not smaller than 50 m2/g; (C) 0.01 to 10 parts by mass of a titanium oxide doped with a transition metal oxide of 0.01 to 5% by mass; (D) 0.01 to 10 parts by mass of a cerium oxide and/or a cerium hydroxide; and (E) 0.01 to 10 parts by mass of a curing agent.

Abstract: A silicone rubber composition is provided comprising (A) an alkenyl-containing organopolysiloxane, (B) reinforcing silica, (C) an inorganic particle-polysiloxane composite comprising inorganic nanoparticles having a polysiloxane containing SiR2R3O2/2 and SiR4R5R6O1/2 units grafted to their surface, and (D) a curing agent. The composition cures into a transparent silicone rubber having UV-absorbing ability and heat resistance.

Abstract: The present invention provides granulated silica including water-granulated silica powders, each of the silica powders having a primary particle size of 5 to 50 nm and a surface hydrophobized with a silicon atom-containing hydrophobizing agent; the granulated silica having a degree of hydrophobization of 40 or more and a loose bulk density of 150 g/L or more. This provides granulated silica that is excellent in handleability and has good dispersibility.

Abstract: Provided is a silicone rubber composition suited for use as a key pad having excellent dynamic fatigue durability (keying durability) and a silicone rubber key pad obtained by curing molding of the composition. A silicone rubber composition for making a key pad includes: (A) 100 parts by weight of an organopolysiloxane represented by the following average compositional formula (1): R1nSiO(4-n)/2??(1) wherein R1 is each independently the same or different and are an unsubstituted or substituted monovalent hydrocarbon group, and letter n is a positive number of 1.95 to 2.04, and having at least two alkenyl groups in one molecule; (B) 10 to 100 parts by weight of reinforcing silica having a specific surface area of at least 50 m2/g when determined by BET method; (C) 0.1 to 10 parts by weight of a vinyl group-containing alkoxysilane; (D) 0.0001 to 0.2 part by weight of hydrochloric acid, calculated as hydrogen chloride in hydrochloric acid; (E) 0.

Abstract: Provided is a silicone rubber composition suited for use as a key pad having excellent dynamic fatigue durability (keying durability) and a silicone rubber key pad obtained by curing molding of the composition. A silicone rubber composition for making a key pad includes: (A) 100 parts by weight of an organopolysiloxane represented by the following average compositional formula (1): R1nSiO(4-n)/2??(1) wherein R1 is each independently the same or different and are an unsubstituted or substituted monovalent hydrocarbon group, and letter n is a positive number of 1.95 to 2.04, and having at least two alkenyl groups in one molecule; (B) 10 to 100 parts by weight of reinforcing silica having a specific surface area of at least 50 m2/g when determined by BET method; (C) 0.1 to 10 parts by weight of a vinyl group-containing alkoxysilane; (D) 0.0001 to 0.2 part by weight of hydrochloric acid, calculated as hydrogen chloride in hydrochloric acid; (E) 0.

Abstract: A silicone rubber composition is provided comprising (A) an alkenyl-containing organopolysiloxane, (B) reinforcing silica, (C) an inorganic particle-polysiloxane composite comprising inorganic nanoparticles having a polysiloxane containing SiR2R3O3/2 and SiR4R5R6O1/2 units grafted to their surface, and (D) a curing agent. The composition cures into a transparent silicone rubber having UV-absorbing ability and heat resistance.

Abstract: Provided is a silicone rubber composition for extrusion molding, including: (A) 100 parts by mass of an organopolysiloxane represented by an average composition formula (1): R1nSiO(4-n)/2 (in the formula, R1 represents identical or different, unsubstituted or substituted monovalent hydrocarbon groups, and n represents a positive number within a range from 1.95 to 2.04), (B) 0 to 50 parts by mass of a vinyl group-containing silicon compound, (C) 5 to 100 parts by mass of a reinforcing silica, and (D) an effective quantity of a curing agent, in which the vinyl group content relative to the combination of the components (A) through (D) is at least 1.0×10?4 mol/g. The composition yields a cured product for which the elastic modulus increases across a temperature range from 30 to 110° C. and which is therefore capable of reducing the temperature dependency of acrylic optical fibers. The composition is suitable for extrusion molding.

Abstract: Provided is a silicone rubber composition for extrusion molding, including: (A) 100 parts by mass of an organopolysiloxane represented by an average composition formula (1): R1nSiO(4-n)/2 (in the formula, R1 represents identical or different, unsubstituted or substituted monovalent hydrocarbon groups, and n represents a positive number within a range from 1.95 to 2.04), (B) 0 to 50 parts by mass of a vinyl group-containing silicon compound, (C) 5 to 100 parts by mass of a reinforcing silica, and (D) an effective quantity of a curing agent, in which the vinyl group content relative to the combination of the components (A) through (D) is at least 1.0×10?4 mol/g. The composition yields a cured product for which the elastic modulus increases across a temperature range from 30 to 110° C. and which is therefore capable of reducing the temperature dependency of acrylic optical fibers. The composition is suitable for extrusion molding.

Abstract: A liquid silicone rubber coating composition that is ideal for forming a coating on an air bag is provided. The composition includes: (A) an organopolysiloxane containing two or more alkenyl groups bonded to silicon atoms within each molecule, (B) an organohydrogenpolysiloxane containing at least two silicon atom-bonded hydrogen atoms within each molecule, (C) an addition reaction catalyst, (D) a finely powdered silica with a specific surface area of at least 50 m2/g, (E) an organosilicon compound containing an epoxy group and a silicon atom-bonded alkoxy group within each molecule, and (F) a compound represented by a general formula: Al(OH)(OCOR)2 (wherein, R represents identical or different, unsubstituted or substituted monovalent hydrocarbon groups of 1 to 20 carbon atoms). Leakage of the inflator gas when the air bag is in an inflated state is suppressed, enabling production of an air bag that exhibits excellent sustainability of the inflation period.

Abstract: Provided is a liquid silicone rubber coating composition, including predetermined quantities of (A) an organopolysiloxane containing 2 or more Si atom-bonded alkenyl groups, (B) an organohydrogenpolysiloxane containing 2 or more SiH groups, (C) an addition reaction catalyst, (D) a finely powdered silica with a specific surface area of at least 50 m2/g, (E) an organosilicon compound containing an epoxy group and a Si atom-bonded alkoxy group, and (F) an oxyzirconium compound. The composition is useful for producing a silicone rubber coating layer on the substrate surface of a curtain air bag. The air bag suppresses leakage of the inflator gas, thus enabling the inflation time to be sustained for a satisfactory period.

Abstract: A liquid silicone rubber coating composition comprising (A) an organopolysiloxane containing silicon-bonded alkenyl radicals, (B) an organohydrogenpolysiloxane containing SiH radicals, (C) an addition reaction catalyst, (D) finely divided silica, (E) an organosilicon compound containing epoxy and alkoxy radicals, (F) an organic titanium, zirconium or aluminum compound, and (G) a silanol-containing silane or siloxane compound is coated on a surface of an airbag base fabric and cured to form a rubber coating layer thereon. The composition is suited for curtain airbags.

Abstract: A press-bonding anisotropic conductive resin composition comprising (A) an organopolysiloxane having on the average at least two alkenyl groups per molecule, (B) an adhesion promoter, (C) finely divided silica, (D) metallized conductive particles, and (E) a curing agent becomes an anisotropic conductor by press bonding. The conductive particles accommodate height variations among electrode terminals, allowing the composition to achieve stable interconnects between all electrode terminals.

Abstract: A liquid silicone rubber coating composition that is ideal for forming a coating on an air bag is provided. The composition includes: (A) an organopolysiloxane containing two or more alkenyl groups bonded to silicon atoms within each molecule, (B) an organohydrogenpolysiloxane containing at least two silicon atom-bonded hydrogen atoms within each molecule, (C) an addition reaction catalyst, (D) a finely powdered silica with a specific surface area of at least 50 m2/g, (E) an organosilicon compound containing an epoxy group and a silicon atom-bonded alkoxy group within each molecule, and (F) a compound represented by a general formula: Al(OH)(OCOR)2 (wherein, R represents identical or different, unsubstituted or substituted monovalent hydrocarbon groups of 1 to 20 carbon atoms). Leakage of the inflator gas when the air bag is in an inflated state is suppressed, enabling production of an air bag that exhibits excellent sustainability of the inflation period.

Abstract: A liquid silicone rubber coating composition comprising (A) an organopolysiloxane containing silicon-bonded alkenyl radicals, (B) an organohydrogenpolysiloxane containing SiH radicals, (C) an addition reaction catalyst, (D) finely divided silica, (E) an organosilicon compound containing epoxy and alkoxy radicals, (F) an organic titanium, zirconium or aluminum compound, and (G) a silanol-containing silane or siloxane compound is coated on a surface of an airbag base fabric and cured to form a rubber coating layer thereon. The composition is suited for curtain airbags.

Abstract: Provided is a liquid silicone rubber coating composition, including predetermined quantities of (A) an organopolysiloxane containing 2 or more Si atom-bonded alkenyl groups, (B) an organohydrogenpolysiloxane containing 2 or more SiH groups, (C) an addition reaction catalyst, (D) a finely powdered silica with a specific surface area of at least 50 m2/g, (E) an organosilicon compound containing an epoxy group and a Si atom-bonded alkoxy group, and (F) an oxyzirconium compound. The composition is useful for producing a silicone rubber coating layer on the substrate surface of a curtain air bag. The air bag suppresses leakage of the inflator gas, thus enabling the inflation time to be sustained for a satisfactory period.

Abstract: Provided is a silicone rubber composition for extrusion molding, including: (A) 100 parts by mass of an organopolysiloxane represented by an average composition formula (1): R1nSiO(4-n)/2 (in the formula, R1 represents identical or different, unsubstituted or substituted monovalent hydrocarbon groups, and n represents a positive number within a range from 1.95 to 2.04), (B) 0 to 50 parts by mass of a vinyl group-containing silicon compound, (C) 5 to 100 parts by mass of a reinforcing silica, and (D) an effective quantity of a curing agent, in which the vinyl group content relative to the combination of the components (A) through (D) is at least 1.0×10?4 mol/g. The composition yields a cured product for which the elastic modulus increases across a temperature range from 30 to 110° C. and which is therefore capable of reducing the temperature dependency of acrylic optical fibers. The composition is suitable for extrusion molding.