Shin-Etsu Chemical Co., Ltd.

Kouji Takano

Hirofumi Kishita

Takashi Matsuda

Kouichi Yamaguchi

Shinichi Sato

Toshio Takago

Koichi Yamaguchi

Shuji Suganuma

Noriyuki Koike

Yasuo Tarumi

Hiromasa Yamaguchi

A novel fluorinated organosilicon compound, exhibiting excellent solvent resistance, chemical resistance and mold release, which is represented by general formula (1): ##STR1## wherein Rf is a divalent group represented by general formula (2): ##STR2## wherein Y is a fluorine atom or CF.sub.3 group; l is an integer of 0-8; k and m are integers of 0-4; j and n are integers of 0 or 1; except when j=k=l=m=n=0.

Fluorinated organosilicon compound

An extremely reactive and highly copolymerizable hexafluoropropylene oxide oligoether derivative, to give bi- or ter-polymers with fluoroolefins and perfluoroalkyl vinyl ethers, which is represented by general formula: ##STR1## wherein X is a fluorine atom or trifluoromethyl group; and n is an integer of 2-5.

Hexafluoropropylene oxide oligother derivative and process for

The present compound is a novel perfluoropolyether represented by the following general formula: ##STR1## wherein m is an integer of 1 to 3 and n is an integer of 2 to 6. This compound is quite useful as an inert liquid used as a heat transfer mediums in the filed of electronic materials.

Perfluoropolyether compound

A curable silicone composition comprising:

Curable silicone composition and its cured product

Fluorinated cyclic organic silicon compounds of the general formula: ##STR1## wherein R.sup.1, R.sup.2, R.sup.3, R.sup.4, and R.sup.5 are independently selected from alkyl groups having 1 to 6 carbon atoms and n is an integer of from 1 to 6 are novel and susceptible to ring-opening polymerization to form chain siloxane polymers having improved properties. The cyclic compounds are produced by reacting disiloxane diols with fluorinated organic silicon compounds in the presence of amine catalysts.

Fluorinated cyclic organic silicon compounds and method for making

A purification method of a fluorine-containing alkylethylene comprises reacting the fluorine-containing alkylethylene with powdered metallic zinc in the presence of an aqueous acetic acid solution. By this method, fluorine-containing alkyl iodide and fluorine-containing alkylethyl iodide, contained as impurities in the fluorine-containing alkylethylene, can be removed effectively, for example, to a level of 1 ppm or below.

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Annaka, Japan

Kouji Takano