Abstract: A fluorinated cation exchange membrane is formed using a copolymer of a fluorovinyl ether (I) having the formulaCF.sub.2 .dbd.CF--O--CF.sub.2 --CFXOCF.sub.2).sub.l (CFX').sub.m (CF OCFX").sub.n Awherein l is 0 to 3; m is 2 to 6; n is 0 to 4 and one of l and n is not zero and l+m+n.gtoreq.3; X, X' and X" are the same or different and each respectively represent --F or --CF.sub.3 ; A represents --CN,--COF, --COOH, --COOR,--COOM or --CONR.sub.2 R.sub.3 ; R.sub.1 represents a C.sub.1-10 alkyl group; and M represents an alkali metal or a quaternary ammonium salt; and a fluorinated olefin (II), or a hydrolyzed copolymer thereof. The fluorinated cation exchange membrane is used for production of a halogen and an alkali metal hydroxide by electrolysis of an alkali metal hydride.

Abstract: 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.

Abstract: 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.

Abstract: 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.

Abstract: A perfluorinated vinyl ether having an ester group which has the formulaCF.sub.2 .dbd.CFOCF.sub.2 (A).sub.p (CF.sub.2).sub.q CO.sub.2 Rwherein A represents a c.sub.1 -C.sub.10 divalent perfluorinated radical; p represents 0 or 1; q represents 0 or 1 to 3; and R represents an organic radical, is produced by pyrolyzing (thermally decomposing) an asymmetric diacyl halide having the formula ##STR1## wherein X represents --F, --Cl or --Br and then, reacting the resulting perfluorinated vinyl ether having a halocarbonyl group which has the formulaCF.sub.2 .dbd.CFOCF.sub.2 (A).sub.p (CF.sub.

Abstract: 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.

Abstract: 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.

Abstract: A fluorinated cation exchange membrane is made of three component copolymer produced by copolymerizing a fluorovinylpolyether having the formula Icf.sub.2 .dbd. cf--o-cf.sub.2 --(cfxocf.sub.2).sub..alpha. --(cfx').sub..beta. --(cf.sub.2 ocfx").sub..gamma. --awherein .alpha. is 0 to 3; .beta. is 0 to 6; .gamma. is 0 to 4 and either .alpha. or .gamma. is not 0; X, X' and X" respectively represent --F or a C.sub.1-5 perfluoroalkyl group; A represents --CN--, --COF, --COOH, --COOR.sub.1, --COOM or --CONR.sub.2 R.sub.3 ; R.sub.1 represents a C.sub.1-10 alkyl group preferably a C.sub.1-3 alkyl group, R.sub.2 and R.sub.3 respectively represents hydrogen atom or a C.sub.1-10 alkyl group; and M represents an alkali metal atom or a quaternary ammonium group, a fluorovinyl compound having the formula IIcf.sub.2 .dbd. cf--(o).sub..delta. --(cfy).sub..gamma. --a'wherein .delta. is 0 to 1; .gamma. is 1 to 6; Y represents --F or a C.sub.

Abstract: 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 formulaCH.sub.2 .dbd. CH--C.sub.n F.sub.2n + 1wherein n is an integer of 2 to 10. Said copolymer has a volumetric flow rate of 10 to 500 mm.sup.3 /sec. defined in the specification.The copolymers of tetrafluoroethylene and ethylene are produced by copolymerizing tetrafluoroethylene and ethylene with a molar ratio of C.sub.2 F.sub.4 /C.sub.2 H.sub.4 being kept essentially higher than 40/60 in the reactor in the presence of a small amount of a perfluoroalkyl vinyl monomer having the formulaCH.sub.2 .dbd. CH--C.sub.n F.sub.2 + 1wherein n is an integer of 2 to 10.This is a continuation of application Ser. No. 689.526, filed May 24, 1976, now abandoned.

Abstract: 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.

Abstract: 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.