Asahi Kasei Kogyo Kabushiki Kaisha

Masato Hamada

Jukichi Ohmura

Fumio Muranaka

Maomi Seko

Hirotsugu Miyauchi

Hiroshi Mikami

Yohei Fukuoka

Joji Nishikido

Yasumichi Yamakoshi

Fumihiko Yamamoto

Toshio Kato

Norio Imai

Hirohumi Iwasaki

Toshihisa Koike

Tetsuro Ohta

A novel fluorine-containing crosslinkable copolymer comprising fluorine-containing monomer units each having a sulfonyl chloride group and monomer units of at least one ethylenically unsaturated compound is disclosed. The present fluorine-containing crosslinkable copolymer has a specific range of a sulfonyl chloride group content and can be easily crosslinked to give a fluorine-containing elastomer which is excellent in heat resistance and chemicals resistance.

Fluorine-containing sulfonyl polymer

A novel process is disclosed for preparing (.omega.-fluorosulfonyl)haloaliphatic carboxylic acid fluorides by electrolytic fluorination, simply and efficiently.

Process for the preparation of (.omega.-fluorosulfonyl)haloaliphatic

Process for the preparation of (.omega.-fluorosulfonyl)-haloaliphatic

A fluorocarbon polymer membrane having pendant sulfonamide groups is first treated with anion radicals and then hydrolyzed for conversion into a cation exchange membrane having carboxylic groups and sulfonic acid groups.

Method for preparation of cation exchange membranes

Alkyl 4,4'-(ethylenedioxy)bis-benzoates having improved properties such as anti-oxidation and anti-coloration are prepared in high yield and selectivity by, at the first step, reacting an excess alkyl p-hydroxybenzoate with a recycling alkyl p-(2-chloro-ethoxy)benzoate with heating in the presence of an alkali carbonate and an inert organic solvent until almost said alkyl p-(2-chloroethoxy)benzoate is consumed to produce an alkyl 4,4'-(ethylenedioxy)bis-benzoate and at the second step adding ethylene dichloride to the reaction system and continuing the heating to produce an alkyl p-(2-chloroethoxy)benzoate which is recycled, and separating the alkyl 4,4'-(ethylenedioxy)bis-benzoate produced.

Process for preparing alkyl 4,4'-(ethylenedioxy)bis-benzoates

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Yokohama, Japan

Masato Hamada