POLYMER COMPOSITION, POLYMER MEMBRANE COMPRISING THE POLYMER COMPOSITION, PROCESS FOR PREPARING IT AND FUEL CELL COMPRISING THE MEMBRANE

摘要

The invention relates to: - a polymer composition comprising (a) a polybenzimidazole derived from (a1) at least one bis-(ortho-diamino) aromatic compound and (a2) at least one aromatic carboxylic acid or derivative thereof, each containing at least two acid groups and at least one hydroxyl group in a - position of a carboxylic group; (b) orthophosphoric acid; and (c) polyphosphoric acids of the formula (I) HO [P(O) (OH)]n H, wherein n is an integer from 2 to 20, wherein the polyphosphoric acids of formula (I) are present in an amount of less than 2 mol %, based upon the sum of moles of orthophosphoric acid (b) and polyphosphoric acids (c), and wherein (b) is present in an amount of 1 to 75 moles per mol of a benzimidazole group formed from (al) and (a2), - a polymer membrane comprising the polymer composition, - a preferred process for preparing the membrane, and - a fuel cell comprising the membrane.