Method of improving characteristics of cation-exchange membrane

Details Method of improving characteristics of cation-exchange membrane Method of improving characteristics of cation-exchange membrane

1977-04-25

1979-04-10

Schofer, Joseph L.

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

Synthetic resins

Ion-exchange polymer or process of preparing

B01D 1504, C08F 1418, C08J 522

Patent

active

041489799

ABSTRACT:
A homogeneous cation-exchange membrane made of one or more fluorinated polymer having cation-exchangeable groups is swollen with a water miscible organic solvent and then the solvent is removed from the swollen membrane.
The fluorinated polymer having cation-exchangeable groups has special characteristics to the water-miscible organic solvent because the cation-exchangeable groups have high affinity to the water-miscible organic solvent though the base of the fluorinated polymer may have water-and oil-repellent properties, whereby the cation-exchange membrane of the fluorinated polymer having cation-exchangeable groups is modified to reduce the permeability of hydroxyl group ions by swelling it and removing the water-miscible organic solvent.

REFERENCES:
patent: 3257334 (1966-06-01), Chen et al.
patent: 3413276 (1968-11-01), Haashi et al.
patent: 3684747 (1972-08-01), Coalson et al.
patent: 3969285 (1976-07-01), Grot

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