Asahi Kasei Kogyo Kabushiki Kaisha

Mitsunobu Fukumoto

Itaru Watanabe

Hirotsugu Miyauchi

Yasumichi Yamakoshi

Kyoji Kimoto

Sakae Tsushima

Maomi Seko

Toshioki Hane

Shigeo Yokoyama

Naomi Seko

An electrolytic cell having anode and cathode chambers separated by a cation exchange membrane comprising a fluorocarbon polymer containing pendant carboxylic acid or salt groups of the formula ##STR1## wherein R is a group containing perfluoroalkyl or perfluoroalkoxy having 1 to 5 carbon atoms and M is hydrogen, an alkali or alkaline earth metal or ammonium as a surface stratum on the cathode side of the membrane. The fluorocarbon polymer may also contain sulfonic acid groups of the formula ##STR2##

Electrolysis of aqueous alkali metal halide solution

Cation exchange membrane comprising a fluorocarbon polymer characterized by the presence of pendant carboxylic acid groups of the formula -- OCF.sub.2 COOH -- and derivatives thereof.

Cation exchange membrane preparation and use thereof

A perfluorocarbon type cation exchange membrane prepared by treatment with an oxidizing agent of a cation exchange membrane containing perfluorocarbon polymers having specific pendant N-sulfonamide groups has improved electrochemical characteristics when used as a membrane in electrolysis of aqueous alkali halide solution.

Process for production of perfluorocarbon type cation exchange membrane

A leno-woven fabric of a specific construction is found to effectively reinforce an ion-exchange membrane at a scarce density of reinforcing yarns to improve electrochemical property of the reinforced ion-exchange membrane.

Growing community of inventors

Yokohama, Japan

Mitsunobu Fukumoto