Process for making composite ion exchange membranes

Details Process for making composite ion exchange membranes Process for making composite ion exchange membranes

1997-05-02

2000-12-05

Nuzzolillo, Maria

Chemistry: electrical current producing apparatus, product, and

Current producing cell, elements, subcombinations and...

Separator, retainer or spacer insulating structure

204 98, 428198, H01M 1024

Patent

active

061564516

ABSTRACT:
A process for making a composite ion exchange membrane including fabricating a layered membrane precursor including a microporous support of highly fluorinated nonionic polymer adhered to a layer of highly fluorinated sulfonyl halide polymer, hydrolyzing the layered membrane precursor to convert the highly fluorinated sulfonyl halide polymer to highly fluorinated sulfonate polymer, impregnating the microporous support with a dispersion of highly fluorinated sulfonate polymer or precursor thereof in a polar liquid medium after hydrolyzing, removing the polar liquid medium, and heating to coalesce the highly fluorinated sulfonated polymer in the support.

REFERENCES:
patent: 4604170 (1986-08-01), Miyake
patent: 4954388 (1990-09-01), Mallouk
patent: 5795668 (1998-08-01), Banerjee

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