Shin-etsu Chemical Co., Ltd.

Shin-estu Chemical Co., Ltd.

Yukinori Satou

Mikio Aramata

Tetsuya Inukai

Hajime Ishizaka

Kunio Itoh

Toshio Shinohara

Hiroaki Kizaki

Shoichi Tanaka

Toshihiro Toma

Koichiro Kobayashi

Kazunobu Umemura

Dimethylchlorosilane is prepared by reacting 1,2-tetramethyldichlorodisilane with hydrogen chloride in the presence of a catalyst mixture of a) palladium, b) a tertiary amine, and c) a tertiary phosphine having at least one phenyl group having at least one functional group other than hydrogen. The catalyst does not lose its activity upon contact with hydrogen chloride at low temperatures and ensures production of dimethylchlorosilane in high yields.

Preparation of dimethylchlorosilane

Organohalosilanes are prepared by reacting metallic silicon particles with an organohalide in the presence of a copper catalyst. A contact mass composed of metallic silicon and copper catalyst contains an effective amount of a catalyst powder obtained by mechanical surface treatment of a powder mixture of tin powder and another metal, typically copper powder, on a ball mill, stamp mill, jet mill, mechanofusion device or the like.

Preparation of organohalosilanes

Organohalosilanes are prepared by reacting metallic silicon particles with an organohalide in the presence of a copper catalyst. A contact mass composed of the metallic silicon and the copper catalyst contains an effective amount of a catalyst alloy containing 0.2&#x2013;8 wt % of tin and 4&#x2013;20 wt % of phosphorus which is powdered by atomization.

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

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Annaka, Japan

Yukinori Satou