Shin-Etsu Chemical Co., Ltd.

Nissin Chemical Industry Co., Ltd.

Yoshinori Inokuchi

Ryuji Horiguchi

Satoshi Kuwata

Ryuichi Inaba

Takaaki Shimizu

Naoki Omura

Masayuki Konishi

Tsutomu Nakamura

Tsuneo Kimura

Masaki Tanaka

Shunji Aoki

Shinji Irifune

Toshio Ohba

Mamoru Hagiwara

Chihiro Hayakawa

Morizo Nakazato

Satao Hirabayashi

Akihiro Kobayashi

Teruki Ikeda

Kenji Tanaka

Toshihiro Okon

Hanako Tawata

Toshikatu Kanehara

Takahito Oki

Takakazu Minato

Mio Sakai

Nobuaki Honsho

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 μm and the polyorganosilsesquioxane (B) has an epoxy group-containing organic group.

Epoxy-modified silicone fine particle, a method for preparing the same, a thermosetting resin composition comprising the fine particles and an encapsulating material

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.

Porous spherical silicone rubber particles, porous silicone composite particles, and method for producing these particles

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 μm 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.

Cosmetic product

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 Rthrough Rrepresent H or a univalent hydrocarbon group, Rand Rrepresent divalent hydrocarbon groups, Rrepresents a univalent hydrocarbon group, and n is an integerto), (C) a vinyltrialkoxysilane represented by formula ():CH&#x2550;CHSi(OR)(where Rrepresents 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.

Silicone emulsion composition for forming rubber coating film, and method for manufacturing same

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.

Production method for silica-coated spherical silicone elastomer particles and silica-coated spherical silicone elastomer particles

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&#xb7;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.

Silicone mist inhibitor

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 &#x3bc;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.

Silicone particles and method for producing same

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, Ris a substituted or unsubstituted C1-C30 monovalent hydrocarbon group excluding R, Ris a carboxy-group-substituted C1-C30 monovalent organic group, Ris Ror R, 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.

Release agent for tire bladder, tire bladder, and pneumatic tire

One of the purposes of the present invention is to provide an aqueous dispersion of silicone elastomer particles to provide a stable emulsion and the silicone elastomer particle, wherein a polyoxyethylene alkyl ether which has an alkyl group having a large number of carbon atoms is used as a surfactant. Further, another purpose is to provide a cosmetic comprising said aqueous dispersion or said silicone elastomer particles and giving a good feeling in the use. The present invention provides an aqueous dispersion comprising (A) silicone elastomer particles having a 90% volume cumulative diameter (D90) of 0.3 to 20 &#x3bc;m in an amount of 5 to 80 mass %, based on a total mass of the aqueous dispersion, (B) at least one polyoxyethylene alkyl ether having an alkyl group having 18 carbon atoms in an amount of 0.01 to 15 mass %, based on a total mass of the aqueous dispersion, wherein a hydrophile-lipophile balance (HLB) of the polyoxyethylene alkyl ether is 12.8 to 15.1, and (C) water in an amount of 19 to 94 mass %, based on a total mass of the aqueous dispersion. Further, the present invention provides a material comprising the aforesaid components (A) and (B), a method for preparing the material and a cosmetic comprising the aqueous dispersion or the material.

Aqueous dispersion comprising silicone elastomer particles, a silicone elastomer particle and a cosmetic

One of the purposes of the present invention is to provide a silicone elastomer particle and an aqueous dispersion of the silicone elastomer particles, which prevent generation of odor from oxygenation of nonionic surfactants. The present invention provides a silicone elastomer particle having a crosslinking structure formed by an addition reaction of a monovalent aliphatic unsaturated group bonded to a silicon atom and a hydrogen atom bonded to another silicon atom, wherein the silicone elastomer particle contains an antioxidant. Further, present invention provides an aqueous dispersion comprising the silicone elastomer particles, a nonionic surfactant and water.

Silicone elastomer particle and an aqueous dispersion comprising the same

A silicone composite particle composed of a silicone rubber particle and a polyorganosilsesquioxane, wherein the silicone rubber particle has plural dents on its surface and the polyorganosilsesquioxane adheres to the surface of the silicone rubber particle. Also, a method for preparing the silicone composite particle, which includes steps of subjecting organotrialkoxysilane to a hydrolysis and subsequent condensation in the presence of water, an alkaline substance and a silicone rubber particle containing therein a liquid to thereby have a resultant polyorganosilsesquioxane adhered to the surface of the silicone rubber particle, and subsequently removing the liquid.

Silicone composite particle and a method for preparing the same

Surfaces of silicone particles are hydrophilized by plasma treatment. The hydrophilized silicone particles are readily dispersible in aqueous materials without a need for dispersants, typically surfactants. In aqueous cosmetic applications externally applied to the skin such as skin care cosmetics, make-up cosmetics, antiperspirant cosmetics, and UV care cosmetics, for example, products free of skin irritation concern can be formulated because formulation is possible without a need for surfactants.

Hydrophilized silicone particles and making method

Water-absorbable silicone rubber particles which are particles of a silicone rubber, each of which has a particle diameter ranging from 0.1 to 1,000 &#x3bc;m and is elastic, wherein the silicone rubber is an organopolysiloxane having a polyoxyalkylene group, contains an oxyethylene unit represented by the formula &#x2014;OCHCH&#x2014; in an amount of 20 to 80 mass %, and can absorb water in an amount of 10 parts by mass or more relative to 100 parts by mass of the silicone rubber. The silicone particles according to the present invention can impart soft touch, a soft-focusing effect and the like to a make-up cosmetic such as a foundation or an antiperspirant when added to the make-up cosmetic or the antiperspirant. In addition, since the particles have high water absorption performance, the particles can absorb sweat and therefore is expected to exhibit an effect of reducing unpleasantness such as stickiness and greasiness, oiliness of the skin and make-up deterioration.

Water-absorbable silicone rubber particles and method for producing same

Silicone composite particles are provided in which silicone elastomer spherical particles having a volume average particle size of 0.1-100 &#x3bc;m are coated with an organosilsesquioxane-based silicone resin containing inorganic nano-particles having a volume average particle size of up to 100 nm. The silicone composite particles are compounded in a cosmetic composition to exert a UV screening effect or bactericidal property inherent to inorganic nano-particles and to impart a pleasant feel on use. A preparing method and a cosmetic composition are also provided.

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Annaka, Japan

Yoshinori Inokuchi