Patent ID: 8846854

Claim:
A method of producing a sulfonated poly(arylene sulfone) comprising: a) providing sulfonated aryl monomer F 1 -AS-F 2 , where AS represents a sulfonated aryl system comprising one or more aromatic rings with each aromatic ring substituted by at least one SO 3 M group and functional groups F 1 and F 2 can be identical or different from each other and can enter into a condensation reaction with a sulfide group; b) polycondensing the sulfonated aryl monomer of a) with an alkali sulfide during formation of a sulfonated poly(arylene sulfide sulfone); and c) oxidizing S— bridging groups of the sulfonated poly(arylene sulfide sulfone) of b) to —SO 2 — bridging groups to obtain a sulfonated poly(arylene sulfone) having each aromatic ring substituted by at least one SO 3 M group.