Patent ID: 8846133
Filing Date: 2014-09-30
Classification: B01D,C08J,H01M,Y02E,Y02P

Abstract:
1. A process for producing a proton-conducting polymer membrane based on polyazoles, which comprises the steps A) Reacting, in a solvent having a dielectric constant greater than 15, one or more aromatic tetraamino compounds with one or more aromatic carboxylic acids comprising at least two acid groups per carboxylic acid monomer to form a salt comprising diammonium cations and carboxylate anions, wherein said salt is isolated for further handling, B) Mixing of the salt from step A) with polyphosphoric acid to form a solution or dispersion, C) Applying a layer to a support using the mixture according to step B), D) Heating the sheet-like structure/layer obtained according to step C) to temperatures of up to 350° C. to form the polyazole polymer, E) Treating the membrane formed in step D) in the presence of moisture at temperatures and for a time which are sufficient for the membrane to be self-supporting.