Patent ID: 7332530

Claim:
A proton-conducting polymer membrane comprising polymers containing sulfonic acid groups, prepared by a process comprising the steps of A) mixing (i) vinyl-containing sulfonic acid with (ii) one or more aromatic tetraamino compounds and with one or more aromatic carboxylic acids, their esters, their acid halides or their acid anhydrides said carboxylic acids, their esters, their acid halides or their acid anhydrides containing at least two carboxylic groups per carboxylic monomer, containing at least two acid groups per carboxylic acid monomer, or mixing (i) vinyl-containing sulfonic acid with (ii) one or more aromatic or heteroaromatic diaminocarboxylic acids, their esters, their acid halides or their acid anhydrides, B) heating the mixture prepared according to step a) under inert gas to temperatures of up to 350° C., to form polyazole polymers, C) applying a layer to a support, using the mixture according to step a) or step b), D) polymerizing the vinyl-containing sulfonic acid present in the sheetlike structure prepared according to step c).