Patent ID: 8716358

Claim:
An anion exchange membrane, comprising, as a main element, a block copolymer (P) comprising a vinyl alcohol polymer block (A) and a cationic-group comprising polymer block (B) as components and which is crosslinked, wherein the polymer block (B) comprises a repeating unit of formula (3): wherein R 2 , R 3 , and R 4 independently of each other are hydrogen, a substituted or nonsubstituted alkyl group containing 1 to 18 carbon atoms, a substituted or nonsubstituted aryl group containing 6 to 18 carbon atoms, or a substituted or nonsubstituted aralkyl group containing 7 to 18 carbon atoms which are optionally combined to form a saturated or unsaturated cyclic structure, R 5 is hydrogen or methyl group, and X − is an anion.