E.i. Dupont De Nemours and Company

Raimund H Silva

Roger A Smith

Paul R Resnick

Walther G Grot

Joseph T Rivers

Thomas C Bissot

Composite fluorocarbon cation exchange membrane having at least two layers of fluorinated polymer containing pendant side chains with sulfonyl groups wherein the equivalent weight of one such layer differs from the adjacent layer by at least 100.

Electrolytic cell with cation exchange membrane having high equivalent

A protective garment fabricated at least in part from a composite fabric which contains a layer of a highly fluorinated ion exchange polymer having sulfonic acid functional groups, all the components of said composite fabric being hydrophilic.

Protective clothing of fabric containing a layer of highly fluorinated

A fluorocarbon cation exchange membrane containing a sacrificial reinforcement for tear resistance which, in use as a cation exchange membrane for alkali metal chloride electrolysis, degrades to provide low voltage operation of the electrolytic cell.

Sacrificial reinforcements in cation exchange membrane

A protective garment fabricated at least in part from a fabric which contains a layer of a highly fluorinated ion exchange polymer having functionality of the sulfonic and/or carboxylic type in the form of an alkali metal, ammonium or amine salt.

Solutions are disclosed with solvents having completely halogenated, saturated, hydrocarbon backbones and solubility parameters within a particular range. Preferred solvent have at least one ether linkage. An exemplary solvent is ##STR1## wherein X is F, Cl, Br, and I; n is 0, 1, and 2; m is 1, 2, and 3; and Y is COOCH.sub.3 and SO.sub.2 F. The solutions include perfluorinated copolymers having high equivalent weight which have been prepared from tetrafluoroethylene and perfluorinated sulfonyl fluoride- or carboxyl-containing vinyl monomers.

Solvents of carboxyl ester compounds and fluoropolymers

Solutions and membranes formed therefrom are disclosed with solvents having completely halogenated, saturated, hydrocarbon backbones and solubility parameters within a particular range. Preferred solvent have at least one ether linkage. An exemplary solvent is ##STR1## wherein X is F, Cl, Br, and I; n is 0, 1, and 2; m is 1, 2, and 3; and Y is COOCH.sub.3 and SO.sub.2 F. The solutions include perfluorinated copolymers having high equivalent weight which have been prepared from tetrafluoroethylene and perfluorinated sulfonyl fluoride- or carboxyl-containing vinyl monomers.

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Hattingen, Germany

Raimund H Silva