Cation exchange membrane of fluorinated polymer with...

Details Cation exchange membrane of fluorinated polymer with... Cation exchange membrane of fluorinated polymer with...

C - Chemistry, Metallurgy

25

B

204/202

C25B 13/08 (2006.01) C08J 5/22 (2006.01)

Patent

CA 1151109

ABSTRACT OF THE DISCLOSURE A cation exchange membrane made of a fluorinated polymer useful for the electrolysis of an alkali metal chloride is obtained by treating a cation exchange membrane having ion exchange groups of the formula -COOM, where M is hydrogen atom or an alkali metal atom or groups convertible to said groups and having an ion exchange capacity (AR) of 0.5 to 2.0 meq/g dry polymer in hydrolyzed form, to give a weight gain percent (.DELTA.WR) in the range of .DELTA.WR=1.6e1.7AR or the upper side; .DELTA.WR=0.8e1.7AR or the lower side; AR=0.5 or the left side and AR=2.0 or the right side shown in Figure 1 of the drawings in an aqueous medium of a base or a salt at a concentration of 1 to 20 wt. % at the temperature of 0 to 60°C after hydrolysis or at the time of hydrolysis.

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