Method of making sheet or shaped cation exchange membrane

Details Method of making sheet or shaped cation exchange membrane Method of making sheet or shaped cation exchange membrane

1979-10-23

1981-11-03

Schofer, Joseph L.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Ion-exchange polymer or process of preparing

204296, 264232, 264299, 264340, 264343, C08K 502, C08J 522

Patent

active

042986974

ABSTRACT:
Normally solid copolymers of a fluorinated vinyl monomer and a perfluorinated vinyl compound having a carboxyl and/or sulfonyl group attached directly to the perfluorinated vinyl group or indirectly through an alkyl or ether linkage have been found to be soluble in low molecular weight polymers of perhalogenated alkyl ethers, low molecular weight polymers of perhalogenated alkyls and perfluoro kerosenes, each of said solvent materials having boiling points between about 200.degree. C. and 350.degree. C. The copolymeric material dissolved in accordance with the instant invention can readily be resolidified by solvent removal and hydrolyzed or converted to the salt form to become a cation exchange material having an equivalent weight in the range of 1000 to 1600.

REFERENCES:
patent: 4007138 (1977-02-01), Konig
patent: 4148979 (1979-04-01), Asumi et al.
patent: 4189361 (1980-02-01), Seita et al.

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