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AssigneeShin-Etsu Chemical Co., Ltd.
InventorsKunio Itoh, Toshio Shinohara, Hiroaki Kizaki, Shoichi Tanaka, Yukinori Satou, Kazunobu Umemura
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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.
A method of selectively producing cyclic dimethylpolysiloxanes, which comprises hydrolyzing dimethyldichlorosilane by contacting it with a water solution which contains a water-soluble oxygen-containing organic compound, and which has a water content of from 1.0 to 1.2 moles per mole of dimethyldichlorosilane, thereby selectively producing cyclic dimethylpolysiloxanes alone which are represented by the following general formula (II):
Dependencies are inferred from the claim text.