Patent ID: 7285325

Claim:
An acid-doped, single-layer or multilayer polymer membrane comprising at least one layer A of a polymer blend comprising: a) from 0.1 to 99.9% by weight of one or more polymers comprising recurring azole units of the formula 1A and/or 1B: wherein the radicals Ar, Ar 1 and Ar 2 are tetravalent, divalent or trivalent aromatic or heteroaromatic groups and the radicals X, which are identical within a repeating unit, are each an oxygen atom, a sulfur atom or an amino group bearing a hydrogen atom, a group having 1-20 carbon atoms, in admixture with b) from 99.9 to 0.1% by weight of a polysulfone comprising recurring units of the formula 2A, 2B, 2C, 2D, 2E, 2F and/or 2G and having no protonated sulfonic acid groups —SO3H or no protonable sulfonic acid salt groups of the formula —SO 3 M + , wherein M + is an inorganic or organic cation: —O—R—SO 2 —R— (2A) —O—R—SO 2 —R—O—R— (2B) —O—R—SO 2 —R—O—R—R— (2C) —O—R—SO 2 —R—R—SO 2 —R— (2E) —O—R—SO 2 —R—R—SO 2 —R—O—R—SO 2 —] (2F) O—R—SO 2 —R SO 2 —R—R (2G), wherein the radicals R are identical or different and are each, independently of one another are 1,2-phenylene, 1,3-phenylene, 1,4-phenylene, 4,4′-biphenyl, a divalent radical of a heteroaromatic, a divalent radical of a C 10 -aromatic or a divalent radical of a C 14 -aromatic and wherein the polymer(s) comprising recurring azole units of the formula 1A and/or 1B are acid doped with a Lewis or Brønsted acid.