Shin-etsu Chemical Co., Ltd.

Nissin Chemical Industry Co., Ltd.

Nisshin Chemical Industry Co., Ltd.

Kunio Itoh

Takeshi Fukuda

Motoo Fukushima

Tsutomu Nakamura

Toshio Shiobara

Masaharu Takahashi

Takeo Yoshida

Kazutoshi Tomiyoshi

Hisashi Shimizu

Koji Futatsumori

Harukazu Okuda

Hiroyuki Ohata

Kiyoshi Imai

Toshimichi Oshima

Hironao Fujiki

Toshio Shinohara

Fumio Okada

Hisashi Aoki

Hiroshi Yoshioka

Masaki Tanaka

Shigeru Mori

Yasushi Yamamoto

Mikio Aramata

Yoshitaka Hamada

Toshio Ohba

Mitsuo Umemura

Kimitaka Kumagae

Naoyoshi Kuga

Nobuyuki Uesugi

Jun Hatakeyama

Yoshio Inoue

Toshio Takago

Shunji Aoki

Eiichi Tabei

Yasuo Tarumi

Hiroshige Okinoshima

Kazuo Koya

Yasuaki Hara

Masachika Yoshino

Masaki Kasashima

Hiroaki Kizaki

Yoshinori Hida

Shohei Kozakai

Toshio Oba

Yuji Tokushige

Kenichi Takita

Kiyoshi Yokokawa

Yoshio Fujimura

Yukinori Satou

Yuji Hinoto

Ken-ichi Takita

Tooru Takamura

Masaaki Matumura

Shoichi Tanaka

Naohiko Harada

Tetuo Yoshida

Sumiko Komiya

Kazunobu Umemura

Masaki Kasahima

Tamio Sato

Tsutomu Matsuo

A conductive powder having an organic silicon polymer layer on the surface of each particle and a metal layer enclosing the silicon polymer layer possesses a stronger bond between the particle base and the metal even at elevated temperature and exhibits a high and stable conductivity and heat resistance.

Conductive powder and making process

A curable silicone composition based on an organopolysiloxane having a cyclotrisiloxane structure quickly cures by brief heating or ultraviolet exposure. It further contains an acid, acid generator, base or base generator or an oniom salt photo-initiator as a curing agent. The cured product has release property from adhesive substance which remains unchanged with the lapse of time and good mold release properties, and thus provides a lightly releasable cured film. The composition is widely used as adhesive tape backing agents, mold release agents, protective coating agents, water and oil repellent agents, and paint base.

Curable silicone compositions

A silicone rubber composition comprising an organopolysiloxane and a reinforcing silica filler can be improved in crepe hardening and shelf stability by blending a specific compound as a wetter.

Silicone rubber compositions

Disclosed is a method of producing dimethylpolysiloxanes through hydrolysis of dimethyldichlorosilane wherein a water solution containing a water-soluble oxygen-containing organic compound is introduced into dimethyldichlorosilane. Therein, linear dimethylpolysiloxanes alone having both ends blocked with chlorine atoms can be selectively produced by properly controlling the water content in the hydrolysis system and further by rendering the hydrolysis system acidic, and cyclic dimethylpolysiloxanes alone can also be selectively produced by properly controlling the water content in the hydrolysis system and optionally rendering the hydrolysis system acidic.

Method of producing dimethylpolysiloxanes

Impression composition

An acrylic rubbery polymer having remarkably improved cold resistance can be prepared by modification with an organopolysiloxane by the emulsion copolymerization of a monomeric mixture of two acrylic monomers, of which one is, for example, an alkyl acrylate and the other is an acrylic compound having, in a molecule, at least one ethylenically unsaturated group other than acrylic group in an aqueous emulsion of an organopolysiloxane having a substantial amount of mercapto-substituted monovalent hydrocarbon groups bonded to the silicon atoms.

Method for the preparation of an acrylic polymer modified with an

The polymeric ingredient of the inventive rubber composition is an acrylic polymer modified with a mercapto-containing organopolysiloxane as prepared by the emulsion polymerization of an acrylic monomer in an aqueous emulsion of the organopolysiloxane. Characteristically, the acrylic monomer is copolymerized with another monomer having an active halogen atom or an epoxy group. By virtue of this unique formulation of the rubbery polymer, the inventive rubber composition prepared by compounding the rubbery polymer with a reinforcing filler and a specified curing or crosslinking agent can be vulcanized to give a vulcanizate having excellent mechanical properties, heat resistance, oil resistance and cold resistance as a combination of the features of silicone rubbers and acrylic rubbers.

Rubber composition

Organic silicon compounds comprising in the molecule thereof, a polysilane structural unit: -(R.sup.1 R.sup.2 Si).sub.n - and a structural unit: R.sup.3.sub.a SiO.sub.(4-a)/2 absorb UV in the range of 300-400 nm and are well soluble in organic solvent. These compounds are useful UV absorbers for cosmetic compositions.

Silicone UV absorbers containing silane units

An epoxy resin composition which comprises a curable epoxy resin, a curing agent, an inorganic filler, and at least one copolymer selected from copolymers obtained by an addition reaction between aromatic polymers containing one or more epoxy groups and one or more alkenyl groups and the specific organopolysiloxanes; copolymers obtained by an addition reaction between aromatic polymers containing one or more epoxy groups and the specific amino group-containing organopolysiloxanes.

Epoxy resin composition

A novel organic silicon compound and hydrolyzate thereof are provided in which an alkoxysilane having an alkoxy radical attached to the silicon atom is attached to a polyester through an alkylene radical. They are useful as a plasticizer for rubber.

Organic silicon compounds, hydrolyzates thereof, and rubber plasticizers

A curable epoxy resin is blended with (a) an alkenyl group-containing epoxidized novolak resin/organopolysiloxane copolymer and (b) a polyimide resin in addition to a curing agent and an inorganic filler. The resulting epoxy resin composition can be cured both under moisture-free conditions and even under moist conditions without inducing a crack. It is suitable for the encapsulation of semiconductor devices as well as for molding and powder coating.

Epoxy resin composition and semiconductor device encapsulated therewith

The fluorine-substituted organopolysiloxane as the principal ingredient of the inventive silicone rubber composition has vinyl groups to serve as the cross-linking points at the molecular chain terminals while at least the penultimate siloxane unit or the silicon atom adjacent to the terminal silicon atom has no fluorine-substituted hydrocarbon group bonded to the silicon atom. Being freed from the steric hindrance due to the bulky fluorine-substituted hydrocarbon group bonded to the adjacent silicon atom, the vinyl group bonded to the terminal silicon atom can pertain to the cross-linking reaction much easier than otherwise so that the silicone rubber composition of the invention containing an organic peroxide or a combination of an organohydrogenpolysiloxane and a platinum catalyst as a curing agent can be rapidly cured to give a cured silicone rubber article having excellent resistance against oils and organic solvents as well as mechanical properties.

Fluorosilicone rubber composition

A rubber composition, which forms a vulcanizate having excellent surface properties such as pleasant feeling of touch and slipperiness or lubricity, comprises, in addition to conventional ingredients such as an ethylene-propylene copolymer, organopolysiloxane, reinforcing silica filler, process oil and curing agent, a powder of spherical particles, such as a poly(methyl silsesquioxane) powder, in the form having a particle diameter of 0.1 .mu.m to 50 .mu.m in a limited amount. The rubber composition forms a spongy rubber vulcanizate when vulcanized in the presence of a blowing agent which, by virtue of excellent surface properties, is useful as powder puffs for make-up.

Ethylene-propylene organopolysiloxane rubber composition

Acryl rubber foaming compositions comprising (A) an acrylic polymer prepared by copolymerizing an acrylate or methacrylate with a monomer having at least two aliphatic unsaturated bonds per molecule, (B) a pyrolytic organic foaming agent, and (C) an organic peroxide can be molded, cured and foamed into acryl rubber foams having improved heat insulation, heat resistance, weatherability, crack resistance, and oil resistance without a need for sulfur vulcanizer.

Acryl rubber foaming compositions and foamed acryl rubber

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Annaka, Japan

Kunio Itoh