Abstract: Provided is a heat-curable resin composition capable of lowering the elastic modulus of a cured product obtained even when a heat-curable resin component in the composition contains an organic solvent or has a high curing temperature. The heat-curable resin composition contains: (A) a heat-curable resin; and (B) spherical polymethylphenyl silsesquioxane particles that have a volume average particle size of 0.1 to 30 ?m, and are in an amount of 1 to 35 parts by mass per 100 parts by mass of the component (A), wherein a molar ratio between units represented by CH3SiO3/2 and units represented by C6H5SiO3/2 (CH3SiO3/2 units:C6H5SiO3/2 units) in the polymethylphenyl silsesquioxane particles is 95:5 to 55:45.

Abstract: A polyether-polysiloxane crosslinked rubber spherical particle including an addition-reaction product of a composition containing: (A) a polyether having at least two aliphatic unsaturated groups per molecule; (B) an organohydrogenpolysiloxane shown by the following formula (1), where 0<1?1000, 2?m?1000, 0?n?1000, R1 represents a hydrogen atom, a monovalent hydrocarbon group having 1 to 12 carbon atoms that is unsubstituted or is substituted with a halogen atom, or an alkoxy group, and R2 represents a monovalent hydrocarbon group having 1 to 20 carbon atoms, the organohydrogenpolysiloxane having at least two silicon-bonded hydrogen atoms per molecule; and (C) a hydrosilylation-reaction catalyst. This can provide rubber spherical particles and composite particles that exhibit excellent dispersibility in an aqueous composition and exhibit degradation characteristics in response to external stimuli; and methods for manufacturing the particles.

Abstract: Provided are polysiloxane structure-containing rubber particles and composite particles having a high dispersibility and degradability; and production methods thereof. The rubber particles are comprised of a copolymer having a polyester structure and an organopolysiloxane structure, wherein the copolymer is a hydrosilylation crosslinked product of (A) a polyester having at least two aliphatic unsaturated groups per molecule; and (B) an organohydrogenpolysiloxane having at least two silicon atom-bonded hydrogen atoms per molecule. The composite particles are those with the surfaces of these rubber particles being coated with polyorganosilsesquioxane or silica.

Abstract: An aqueous silicone dispersion capable of forming an elastomer coating film when dried at a normal temperature, said aqueous silicone dispersion comprising: (A) a silicone elastomer which is an addition reaction product of an alkenyl group-containing organopolysiloxane (A-1) having 2 or more alkenyl groups per molecule, an organopolysiloxane (A-2) having 3 or more hydrosilyl groups per molecule and a linear diorganopolysiloxane (A-3) having hydrosilyl groups at both ends of the molecular chain; (B) an anionic surfactant; (C) a nonionic surfactant; (D) colloidal silica; and (E) water.

Abstract: The silicone emulsion composition for forming a rubber coating film according to the present invention, including (A) an organopolysiloxane having at least two hydroxyl groups bonded to silicon atoms at terminal ends of the molecule in each molecule thereof, (B) an aminoalkyltrialkoxysilane represented by formula (1) (where R1 through R3 represent H or a univalent hydrocarbon group, R4 and R5 represent divalent hydrocarbon groups, R6 represents a univalent hydrocarbon group, and n is an integer 0 to 6), (C) a vinyltrialkoxysilane represented by formula (2): CH2?CHSi(OR7)3 (where R7 represents a univalent hydrocarbon group), (D) a surfactant, and (E) water and not containing an organic tin compound, is free of problems with storage stability or byproducts, and a rubber coating film can be formed thereby in a short time without the use of an organic tin compound.

Abstract: One of the purposes of the present invention is to provide silicone fine particles which do not aggregate in a thermosetting resin while having softness derived from silicone rubber and have excellent adhesion with the thermosetting resin. The other purpose is to provide a method for preparing the same. The other purpose is to provide a thermosetting resin composition and an encapsulating material, each comprising the fine particles. The present invention provides an epoxy-modified silicone fine particle composed of (A) a spherical silicone rubber fine particle coated with (B) polyorganosilsesquioxane, wherein the spherical silicone rubber fine particle (A) has an average particle diameter of 0.1 to 100 ?m and the polyorganosilsesquioxane (B) has an epoxy group-containing organic group.

Abstract: A method for producing silica-coated spherical silicone elastomer particles which includes a step in which a tetraalkoxysilane (E) is added to a liquid comprising spherical silicone elastomer particles (A), an alkaline substance (B), one or more ingredients (C) selected from among cationic surfactants and cationic water-soluble polymers, and water (D), and the tetraalkoxysilane is hydrolyzed and condensed to thereby coat the surfaces of the spherical silicone elastomer particles with silica.

Abstract: One of the purposes of the present invention is to provide an emulsion composition which is stable over time and gives, upon drying, a coating with good slipping property. Another purpose of the present invention is to provide an emulsion composition containing a reduced or, in particular, zero amount of octamethylcyclotetrasiloxane, decamethylcyclopentasiloxane and dodecamethylcyclohexasiloxane as impurities. The present invention provides an aqueous dispersion comprising an emulsion comprising a silicone which is a condensation reaction product of the following components (A-1) and (B): (A-1) a linear organopolysiloxane being an addition reaction product of (a1) a linear organopolysiloxane having two alkenylsilyl groups each only at each of molecular terminals and (a2) a linear organopolysiloxane having two hydrosilyl groups each only at each of molecular terminals, provided that a ratio of the number of the hydrosilyl group in component (a2) to the number of the alkenylsilyl group in component (a1) is 0.

Abstract: Provided are: silica-coated particles which have satisfactory dispersibility in resins and liquid materials, have functional groups capable of reacting with resins, and also has satisfactory slipperiness as well as water repellency; and a method for producing the silica-coated particles. Silica-coated particles, in which the surface of each of solid particles (A) is coated with silica (B), a part or the whole of a hydroxyl group on the surface of the silica (B) is reacted with at least one component (C) selected from an organoalkoxysilane and a hydrolysate thereof and an organosilazane, wherein the amount of the silica (B) is 0.5 to 100 parts by mass relative to 100 parts by mass of the solid particles (A).

Abstract: This cosmetic product has extensibility and imparts use feels such as silkiness and smoothness, and further demonstrates excellent soft focus effects, and contains: (A) spherical organopolysiloxane particles of which 90% by mole or more are constituted from organosilsesquioxane units and which have a volume average particle size of 0.1 to 30 ?m and an average refractive index of 1.44 to 1.57, and; (B) an oil agent; and one or more selected from (C) a silicone crosslinked product and (D) a silicon resin coating silicon rubber powder.

Abstract: An emulsion composition comprising (A) an organopolysiloxane as an addition reaction product of a hydrosilyl group of the following component (A-1) with an alkenyl group of the following component (A-2): (A-1) a linear organopolysiloxane having a hydrosilyl group at both terminals of the molecular chain and no functional group other than a hydrosilyl group at the terminals; or a mixture of said hydrosilyl group-containing linear organopolysiloxane and a linear organopolysiloxane having at least one functional group other than a hydrosilyl group at the terminal and optionally having a hydrosilyl group at the terminal, wherein a percentage of the number of terminal silicon atoms having the functional group other than a hydrosilyl group is less than 5%, based on a total number of terminal silicon atoms of the whole organopolysiloxanes in component (A-1); and (A-2) a linear organopolysiloxane having an alkenylsilyl group at both terminals of the molecular chain and no functional group other than an alkenylsily

Abstract: The present invention provides: porous spherical silicone rubber particles which have high light scattering performance; porous silicone composite particles; and a method for producing these particles. The porous spherical silicone rubber particles have pores inside the particles or in the surfaces of the particles.

Abstract: Silicone particles in which the surface of silicone elastomer spherical particles having a volume-average particle size of 0.1-100 ?m is coated by a polyorganosilsesquioxane containing a methyl silsesquioxane unit represented by compositional formula (1) CH3SiO3/2??(1) and a (meth)acryloxyalkyl silsesquioxane unit represented by compositional formula (2) or (3) (in the formula, R1 is a C2-6 alkylene group and R2 is a C2-6 alkylene group) wherein the mass of the polyorganosilsesquioxane is 0.5-25 mass parts per 100 mass parts of silicone elastomer spherical particles.

Abstract: A silicone mist inhibitor which has an excellent effect of inhibiting silicone mist and provides a composition and a cured product which have excellent storage stability is provided. A silicone mist inhibitor includes at least one selected from organic powder, inorganic powder and inorganic-organic composite powder, wherein the powder has a volume average particle size of 100 to 4000 nm. Further, a solventless silicone composition includes an organopolysiloxane having a viscosity at 25 degrees C. of 25 to 50,000 mPa·s, wherein the solventless silicone composition further includes the aforesaid silicone mist inhibitor in an amount of 0.1 to 10 parts by mass, relative to 100 parts by mass of the organopolysiloxane.

Abstract: A method for producing silica-coated spherical silicone elastomer particles which includes a step in which a tetraalkoxysilane (E) is added to a liquid comprising spherical silicone elastomer particles (A), an alkaline substance (B), one or more ingredients (C) selected from among cationic surfactants and cationic water-soluble polymers, and water (D), and the tetraalkoxysilane is hydrolyzed and condensed to thereby coat the surfaces of the spherical silicone elastomer particles with silica.

Abstract: The silicone emulsion composition for forming a rubber coating film according to the present invention, including (A) an organopolysiloxane having at least two hydroxyl groups bonded to silicon atoms at terminal ends of the molecule in each molecule thereof, (B) an aminoalkyltrialkoxysilane represented by formula (1) (where R1 through R3 represent H or a univalent hydrocarbon group, R4 and R5 represent divalent hydrocarbon groups, R6 represents a univalent hydrocarbon group, and n is an integer 0 to 6), (C) a vinyltrialkoxysilane represented by formula (2): CH2?CHSi(OR7)3 (where R7 represents a univalent hydrocarbon group), (D) a surfactant, and (E) water and not containing an organic tin compound, is free of problems with storage stability or byproducts, and a rubber coating film can be formed thereby in a short time without the use of an organic tin compound.

Abstract: Provided are silicone particles having a rubber elasticity, a low cohesiveness, a high dispersibility in a resin, and alkenyl groups on the surfaces thereof; and a method for producing the same. The silicone particles are silicone elastomer spherical particles having surfaces thereof coated with polymethylalkenylsilsesquioxane, and having a volume average particle size of 0.1 to 100 ?m, in which the polymethylalkenylsilsesquioxane is in an amount of 0.5 to 25 parts by mass per 100 parts by mass of the silicone elastomer spherical particles, and alkenylsilyl groups are present on the surface of the polymethylalkenylsilsesquioxane.

Abstract: An aqueous silicone dispersion capable of forming an elastomer coating film when dried at a normal temperature, said aqueous silicone dispersion comprising: (A) a silicone elastomer which is an addition reaction product of an alkenyl group-containing organopolysiloxane (A-1) having 2 or more alkenyl groups per molecule, an organopolysiloxane (A-2) having 3 or more hydrosilyl groups per molecule and a linear diorganopolysiloxane (A-3) having hydrosilyl groups at both ends of the molecular chain; (B) an anionic surfactant; (C) a nonionic surfactant; (D) colloidal silica; and (E) water.

Abstract: A release agent for being coated onto a tire bladder made of a zinc-oxide-incorporated butyl rubber during pneumatic-tire molding, the release agent containing (A) organopolysiloxane, which contains a carboxy group indicated by the general formula (1) below (in the formula, R1 is a substituted or unsubstituted C1-C30 monovalent hydrocarbon group excluding R2, R2 is a carboxy-group-substituted C1-C30 monovalent organic group, R3 is R1 or R2, and n is an integer of 3 to 2000.). This release agent produces a longer service life of a tire bladder and leads to reduced tire production cost because the amount of silicone that migrates to the tire side is low when the tire is released, and repeated mold-release performance is enhanced.

Abstract: Provided are silicone particles having a rubber elasticity, a low cohesiveness, a high dispersibility in a resin, and alkenyl groups on the surfaces thereof; and a method for producing the same. The silicone particles are silicone elastomer spherical particles having surfaces thereof coated with polymethylalkenylsilsesquioxane, and having a volume average particle size of 0.1 to 100 ?m, in which the polymethylalkenylsilsesquioxane is in an amount of 0.5 to 25 parts by mass per 100 parts by mass of the silicone elastomer spherical particles, and alkenylsilyl groups are present on the surface of the polymethylalkenylsilsesquioxane.