Patent ID: 7727651

Claim:
A proton-conducting polymer membrane comprising polymers containing phosphonic acid groups which is obtained by a process comprising the steps A) mixing at least 20% by weight of based on the total weight of the mixture of vinyl-containing phosphonic acid with one or more aromatic tetraamino compounds with one or more aromatic carboxylic acids, esters thereof, acid halides thereof or anhydrides thereof which contain at least two acid groups per carboxylic acid monomer, and/or mixing of vinyl-containing phosphonic acid with one or more aromatic and/or heteroaromatic diamino carboxylic acids, esters thereof, acid halides thereof or anhydrides thereof, B) heating of the mixture obtainable according to step A) under inert gas at temperatures of up to 350° C. to form a polyazole polymer, C) application of a layer using the mixture from step A) and/or B) to a support, D) polymerization of the vinyl-containing phosphonic acid present in the sheet-like structure obtainable according to step C) and wherein the membrane has a proton conductivity of at least 0.001 S/cm @ 120° C.