Fluorinated ion exchange polymer containing carboxylic groups, p

Details Fluorinated ion exchange polymer containing carboxylic groups, p Fluorinated ion exchange polymer containing carboxylic groups, p

1978-11-13

1981-05-12

Schofer, Joseph L.

Organic compounds -- part of the class 532-570 series

Organic compounds

Carboxylic acid esters

521 27, 521 38, 526245, C09C 6973, B01D 1304

Patent

active

042673640

ABSTRACT:
Fluorinated ion exchange polymers which have pendant side chains which contain --OCF.sub.2 COOR groups, or which have both pendant side chains containing carboxylic groups and pendant side chains which contain sulfonyl groups, when used in the form of membranes to separate the anode and cathode compartments of an electrolysis cell, permit operation at high current efficiency. Those containing both carboxylic and sulfonyl groups can be made by oxidation of fluorinated polymers which have pendant side chains containing sulfinic groups, or both sulfinic and sulfonyl groups. The fluorinated polymers which have pendant side chains containing sulfinic groups, or both sulfinic and sulfonyl groups, are in turn made from fluorinated polymers which have pendant side chains containing sulfonyl halide groups by reduction with, for example, hydrazine. Those polymers which have only pendant side chains which contain --OCF.sub.2 COOR groups can be made by copolymerization of a mixture of monomers, one of which is a vinyl monomer which contains the indicated carboxylic group.
Fluorinated ion exchange polymers which have pendant side chains containing --OCF.sub.2 COOR groups and also pendant side chains which contain sulfonyl groups can also be made by copolymerization of a mixture of monomers, one of which is a vinyl monomer which contains the indicated carboxylic group; and also by treatment of a polymer which contains --OCF.sub.2 CF.sub.2 SO.sub.3 H or salts thereof with a combination of fluorine and oxygen.

REFERENCES:
patent: 3849243 (1974-11-01), Grot
patent: 4116888 (1978-09-01), Ukihashi et al.
patent: 4138426 (1979-02-01), England
patent: 4151053 (1979-04-01), Seko et al.
patent: 4153804 (1979-05-01), Yamabe et al.
patent: 4178218 (1979-12-01), Seko

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