Asahi Glass Company, Limited

Hiroshi Ukihashi

Masaaki Yamabe

Tatsuro Asawa

Haruhisa Miyake

Tomoki Gunjima

Takeshi Abe

Isamu Kaneko

Nobuaki Kunii

Seiji Munekata

Takao Hayashi

Hiroaki Kojima

Tetsuya Uchino

Yukio Takasaki

A fluorinated cation exchange membrane is formed using a copolymer of a fluorovinyl ether (I) having the formula

Fluorinated cation exchange membrane and use thereof in electrolysis of

Propylene and tetrafluoroethylene are copolymerized at the low temperature of 0.degree.-50.degree. C. in an aqueous medium in the presence of a specific redox catalyst system. The specific redox catalyst system comprises (1) a water soluble inorganic persulfate, (2) a water soluble thiosulfate or bisulfite and (3) a water soluble iron salt, and preferably further comprises a reducing sugar and a water soluble pyrophosphate. The propylene-tetrafluoroethylene copolymer having high molecular weight and low Mooney viscosity can be prepared at high copolymerization reaction rates.

Process for preparing a propylene-tetrafluoroethylene copolymer

A cation exchange membrane of a fluorinated polymer is formed by incorporating fibrils of polytetrafluoroethylene into a cation exchange resin of a fluorinated polymer having carboxylic acid groups or functional groups which can be converted to carboxylic acid groups.

Cation exchange membrane of fluorinated polymer for electrolysis and

A cation exchange membrane of a fluorinated polymer is formed by incorporating fibrils of polytetrafluoroethylene in a cation exchange resin of a fluorinated polymer having sulfonic acid type ion exchange groups which has high chemical resistances such as chlorine resistance, oxidation resistance and alkaline resistance, in an electrolysis.

Cation exchange membrane of fluorinated polymer containing

A perfluorinated vinyl ether having an ester group which has the formula

Process for producing perfluorinated vinyl ether having ester group

A fluorinated copolymer having 1 to 50 mole % of a component having functional group of carboxylic acid group or a group which can be converted to carboxylic acid group, is produced by copolymerizing a fluorinated ethylenic unsaturated monomer and a functional monomer having the functional group in the presence of a polymerization initiator source in an aqueous medium under the pressure of higher than 7 kg/cm.sup.2 whereby the copolymer having high molecular weight (T.sub.Q of higher than 150.degree. C.) and an ion exchange capacity of 0.5 to 4 meq/g dry polymer is produced.

Process for producing fluorinated copolymer having ion-exchange groups

A process for producing a perfluorocarboxylic acid comprises reacting a perfluoroalkyl olefin with ozone to produce a perfluoroalkyl ozonide and a perfluoroalkyl aldehyde and converting said perfluoroalkyl ozonide and perfluoroalkyl aldehyde to perfluorocarboxylic acid with an oxidizing agent.

Process for producing perfluorocarboxylic acid

A fluorinated cation exchange membrane is made of three component copolymer produced by copolymerizing a fluorovinylpolyether having the formula I

Copolymers of tetrafluoroethylene and ethylene essentially consist of components of from 40 to 60 mole % of tetrafluoroethylene, 40 to 60 mole % of ethylene and 0.1 to 10 mole % of perfluoroalkyl vinyl component having the formula

Terpolymers of tetrafluoroethylene, ethylene and perfluoroalkyl vinyl

A fluorinated copolymer having 1 to 50 mole % of a component having functional group of carboxylic acid group or a group which can be converted to carboxylic acid group, is produced by copolymerizing a fluorinated ethylenic unsaturated monomer and a functional monomer having the functional group in the presence of a polymerization initiator source in 0 to 10 mole of an inert organic solvent per 1 mole of the functional monomer under the pressure of higher than 6 kg/cm.sup.2 whereby the copolymer having high molecular weight (T.sub.Q of higher than 150.degree. C) and an ion exchange capacity of 0.5 to 4 meq/g dry polymer is produced.

A powder lining method which comprises coating a substrate with a synthetic resin powder containing 2 to 50 wt. % of a carbon fiber having a length of less than 1000 microns and subsequently baking. The use of a synthetic resin powder containing carbon fibers makes possible the preparation of significantly thicker linings in a single step than was possible previously.

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Tokyo, Japan

Hiroshi Ukihashi