Shin-etsu Chemical Co., Ltd.

Mitsubishi Rayon Company, Limited

Bridgestone Tire Company Limited

Md Kasei Limited

Toshio Oba

Fumio Okada

Morizo Nakazato

Kenichi Isobe

Hiroshi Yoshioka

Isao Sasaki

Masaki Tanaka

Kunio Itoh

Akira Yanagase

Hisashi Shimizu

Koji Futatsumori

Hiroshige Okinoshima

Yoshinori Hida

Shohei Kozakai

Yasunori Kawachi

Tetsuya Mayuzumi

Yuji Hinoto

Takeshi Mihama

Shintaro Tachibana

Kazuo Shoji

Hiroshi Oohashi

Tatuo Tanaka

A process for preparing organopolysiloxane emulsion comprised of dispersed particles having an average particle size of 0.5.mu. or less, comprising emulsifying a liquid organopolysiloxane with use of an emulsifying agent by means of a composite emulsifying apparatus equipped with

Process for preparing organopolysiloxane emulsion

The reactive injection molding of a urethane-based resin composition according to the invention is performed by admixing the polyol compound as one of the reactants of the urethane-based resin with a specific organopolysiloxane as an internal mold release agent so that the molding process can be performed without application of an external mold release agent to the metal mold. The organopolysiloxane is characterized by two types of substituent groups bonded to the silicon atoms, of which the first type is --C.sub.x H.sub.2x OR', R' being a monovalent hydrocarbon group of 8 to 30 carbon atoms free from chain end unsaturation and x being 0-4, and the second type is --C.sub.y H.sub.2y (OC.sub.n H.sub.2n).sub.m OH, y being 1-4, n being 2-4 and m being 0-45.

Method of reactive injection molding of a urethane-based resin

Fine spherical particles of cured silicone elastomer can be prepared by spray-drying an aqueous emulsion of a curable organopolysiloxane composition having a particle diameter not exceeding 20 .mu.m. The organopolysiloxane composition comprises preferably an organopolysiloxane having silicon-bonded vinyl groups, an organohydrogenpolysiloxane having silicon-bonded hydrogen atoms and a platinum catalyst so that curing of the composition may take place in the emulsion before spray-drying or in the course of spray-drying by the addition reaction between the silicon-bonded vinyl groups and the silicon-bonded hydrogen atoms.

Method for the preparation of fine spherical particles of silicone

A polyorganosiloxane-based high-impact thermoplastic graft copolymer superior in impact resistance, light resistance, surface gloss and color fastness produced by the emulsion graft polymerization of at least one vinyl monomer on an emulsion-polymerized polyorganosiloxane which consists of

Impact-resistant thermoplastic polyorganosiloxane-based graft copolymer

The inventive method for forming a cured film on a substrate surface comprises coating the surface with a room temperature curable organosiloxazane polymer comprising, in a molecule, (a) at least one organosiloxane unit represented by the unit formula (a) at least one organosiloxane unit represented by the unit formula

Method for forming a surface film of cured organosilicon polymer on a

The invention provides a method for protecting the surface of various kinds of shaped articles made of an organic polymeric material such as rubbers, leathers, woods, plastics and the like against weathering caused by exposure to ultraviolet light, ozone, moisture, etc. The method comprises providing the surface with a coating layer of a specific organopolysiloxane composed of difunctional, tetrafunctional and nonofunctional siloxane units in a limited molar proportion of 50-85%, 10-30% and 5-20%, respectively.

Method for providing anti-weathering resistance to the surface of

The invention provides an efficient method for releasing a shaped body of a polymeric material such as a foamed polyurethane resin from a mold in which the body has been molded without the problem of adhesion to the mold. The inventive method comprises admixing the polymeric material with a specific organopolysiloxane represented by the structural formula

Method for improving mold releasability of a polymeric material

The invention provides a novel organopolysiloxane-containing aqueous emulsion composition which, upon removal of water by drying at room temperature, can give a cured rubbery elastomer having excellent mechanical properties and exhibiting strong adhesion to the substrate on which it has been cured. The inventive composition is prepared by blending (A) an aqueous emulsion of an organopolysiloxane having silicon-bonded hydroxy groups and emulsified in water by use of an anionic surface active agent, (B) a mixture of a reaction product of a carboxylic acid anhydride with an amino-functional organosilane and a colloidal silica in the form of an aqueous suspension and (C) a curing catalyst in limited proportions.

Aqueous emulsion-type silicone compositions

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Gunma, Japan

Toshio Oba