Tama Chemicals Co., Ltd.

Toshiba Silicone Co., Ltd.

Moses Lake Industries, Inc.

Tsurahide Cho

Toshitsura Cho

Yoshiro Ohta

Osamu Yagi

Makoto Nishida

Nobuaki Ohkawa

Ryuichi Oyama

Tohru Yamashita

Takaaki Tamura

Kazumi Suzuki

Process for recovering organoalkoxysilane from polyorganosiloxane

This invention relates to a process for preparing dialkyl carbonates by the reaction of one kind or a mixture of two or more kinds selected from urea, methyl carbamate and ethyl carbamate with methanol and/or ethanol in the presence of a catalyst under pressure at 100.degree. to 250.degree. C. and the process does not use poisonous phosgene or carbon monoxide as raw material and readily yields dimethyl carbonate and diethyl carbonate in simple equipment.

Process for preparing dialkyl carbonates

This invention relates to a process for preparing alkoxysilanes of the general formula (R.sup.2) .sub.a SiH(OR.sup.1).sub.b in which R.sup.1 is a lower alkyl group with 1 to 6 carbon atoms, R.sup.2 is an aliphatic or aromatic hydrocarbon radical with 1 to 8 carbon atoms, a is 0 or 1, and b is 2 or 3 by the reaction of metallic silicon, an alcohol, and an acetal and/or an orthocarboxylic acid ester in the presence of a copper catalyst and provides a novel process for preparing directly and advantageously alkoxysilanes having one hydrogen atom linked to the silicon atom, particularly alkyldialkoxysilanes and trialkoxysilanes.

Process for preparing alkoxysilanes

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Tokyo, Japan

Tsurahide Cho