| http://www.w3.org/ns/prov#value | - .3 ; A is --CN, --COF, --COOH, --COOR, --COOM or --CONR.sub.2 R.sub.3 ; R.sub.1 isa C.sub.1-10 alkyl group; R.sub.2 and R.sub.3 each respectively is hydrogen or a C.sub.1-10 alkyl group; and M is an alkali metal or a quaternary ammonium salt; and a fluorinated olefin (II);said membrane having an ion-exchange capacity of carboxylic acid groups of from 0.5 to 3.0 milliequivalents per gram of dry res
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