NOVELTY - Proton-conducting polymer membrane obtained by: (a) mixing one or more aromatic tetramino compounds, aromatic carboxylic acids or esters or aromatic and/or heteroaromatic diaminocarboxylic acids in polyphosphoric acid to form a solution and/or dispersion; (b) heating the mixture until polymerizing; (c) adding one or more polyazole polymers; (d) heating the mixture; (e) applying a membrane layer using the mixture on a carrier; (f) optionally heating the membrane; (g) treating the membrane formed in water and/or moisture; and (h) removing the membrane, is claimed.    USE - The proton-conducting polymer membrane is useful for producing membrane electrode units or a fuel cells (all claimed).    ADVANTAGE - The proton-conducting polymer membrane has excellent chemical and thermal properties.    DETAILED DESCRIPTION - Proton-conducting polymer membrane based on polyazoles, obtained by: (a) mixing (i) one or more aromatic tetramino compounds and (ii) one or more aromatic carboxylic acids or esters which contain at least two acid groups per carboxylic acid monomer, or (iii) one or more aromatic and/or heteroaromatic diaminocarboxylic acids in polyphosphoric acid to form a solution and/or dispersion; (b) heating the mixture from the step (a), and polymerizing until an intrinsic viscosity of at least 0.8 dl/g, which is obtained for the polymer; (c) adding one or more polyazole polymers, heating the mixture from the step (c); (e) applying a membrane layer using the mixture from the step (d) on a carrier or on an electrode; (f) optionally heating the membrane on the carrier or electrode obtained from the step (e); (g) treating the membrane formed in the presence of water and/or moisture; and (h) removal of the membrane from the carrier, is claimed, where the total content of all polyazole polymers in the membrane is 5-25 wt.%, the total content of polymer includes any acids and water and excludes optional additives. INDEPENDENT CLAIMS are included for:    (1) an electrode having the proton-conducting polymer coating based on polyazoles obtained by the above process;    (2) a membrane-electrode unit comprising either at least two electrodes and at least one membrane, or at least one electrode; and    (3) a fuel cell comprising one or more membrane-electrode units.