Patent ID: 8349993

Claim:
A sulfonated poly(arylene) containing exclusively recurring structural element(s) of formulas —[—Ar 1 (SO 3 M) n -X—]— and —[—Ar 2 (SO 3 M) n -Y—]—, wherein X and Y are each —SO 2 — and Ar 1 and Ar 2 , which are either identical or different from each other, represent an aromatic or heteroaromatic ring system with 5-18 ring atoms; wherein the aromatic or heteroaromatic ring system, in addition to SO 3 M and X and Y, does not include additional substituents; M represents a monovalent cation and n is an integral number between 1 and 4; M and n can be identical or different in various structural elements, independently of each other, and has a molecular weight of 2,000 to 2,000,000.