Shin-etsu Chemical Co., Ltd.

Masayuki Oyama

Toshio Takago

Noriyuki Koike

Takashi Matsuda

Yasushi Yamamoto

Koichi Yamaguchi

Hitoshi Kinami

Shinichi Satoh

Hirofumi Kishita

Masaharu Takahashi

Kenichi Fukuda

Hideki Fujii

Kipp J Mize

Kazutoshi Munezawa

A process of producing a perfluorocarboxylic acid fluoride having the formula (1): ##STR1## wherein n is an integer of at least 2, comprising effecting oligomerization of hexafluoropropylene oxide in the presence of an alkali metal fluoride a sulfone or a mixture of a sulfone with an ether having the formula (2):

Process for producing perfluorocarboxylic acid fluoride

A perfluorooligoether iodide is prepared by exposing a perfluoropolyether carboxylic iodide to UV light.

Preparation of perfluorooligoether iodides

Oligohexafluoropropylene oxide derivatives represented by the general formula (I): ##STR1## wherein R.sub.f represents a perfluoroalkyl group having 1 to 10 carbon atoms and n is an integer of 0 to 100 or the general formula (II): ##STR2## wherein R.sub.f ' represents a perfluoroalkylene group having 2 to 10 carbon atoms and a and b are each independently an integer of 0 to 20. These compounds are novel and are useful as intermediates for synthesizing iodine-containing oligohexafluoropropylene oxides useful as raw materials for fluororesins, fluororubbers, and fluorine-containing surfactants.

Oligohexafluoropropylene oxide derivative and process of producing the

The present invention provides a heat-curable fluorosilicone rubber composition to be cured by hydrosilation reactions and having outstanding physical properties, especially improved transparency and processability, said composition comprising

Heat-curable fluorosilicone rubber composition and cured product thereof

Fluorinated organic silicon compound of the general formula: ##STR1## wherein R is an alkyl group having 1 to 6 carbon atoms, n is an integer of from 1 to 6, and m is equal to 1, 2 or 3 are novel and useful as treating agents and intermediates for the synthesis of fluorinated cyclic organic silicon compounds. The fluorinated organic silicon compounds are prepared by reacting a chlorosilane with a fluorinated olefin.

Fluorinated organic silicon compounds and method for making

A process of producing a silethylene oxide represented by the following general formula (1): ##STR1## wherein R.sup.1, R.sup.2, R.sup.3, and R.sup.4 each represent a hydrocarbon group having 1 to 8 carbon atoms such as a methyl group, comprising the steps of thermally decomposing the hydrolyzate of 1,4-dichloro-1,1,4,4-tetrahydrocarbyl-1,4-disilabutane in the presence of an alkali, bringing the thermally decomposed product in contact with carbon dioxide and distilling the reaction mixture. According to this process, in the distillation, since polymerization or formation of 2,5-disilahexane-2,5-diol can be obviated, a purified silethylene oxide can be obtained in high yield. Further, the distillation apparatus will not be clogged with by-products.

Process of producing silethylene oxide

A novel oligohexafluoropropylene oxide derivative is a useful intermediate. It is prepared by reacting an oligohexafluoropropylene oxide carbonyl fluoride with a metal iodide.

Oligohexafluoropropylene oxide derivatives and method of making

An organosilicon compound having the general formula (I): ##STR1## wherein R.sup.1 represents the methyl group or the ethyl group, R.sup.2 represent an alkyl group having from 1 to 4 carbon atoms, and n represents an integer of from 1 to 3. This compound is useful in preparing room temperature vulcaniazable organopolisiloxane compositions which have good storage stability, and release no smelly or corrosive condensation by-product on curing.

Organosilicon compound

An organosilicon compound having the general formula (I): ##STR1## wherein R.sup.1 represents the methyl group or the ethyl group, R.sup.2 represents an alkyl group having from 1 to 4 carbon atoms, and n represents an integer of from 1 to 3. This compound is useful in preparing room temperature vulcanizable organopolisiloxane compositions which have good storage stability, and release no smelly or corrosive condensation by-product on curing.

Growing community of inventors

Takasaki, Japan

Masayuki Oyama