Patent ID: 7030206

Claim:
A polymer electrolyte comprising a sulfonated product of a polymer shown by the following general formula (I): wherein X represents at least one structure selected from structures shown by the following formulas (X-1), (X-2), and (X-3), Y represents at least one structure selected from structures shown by the following formulas (Y-1) to (Y-12), Z represents at least one structure selected from structures shown by the following formulas (Z-1) and (Z-2), X, Y, and Z being bonded randomly, alternately, or in blocks, y represents an integer of two or more, and each of x and z represents an integer of zero or more, where x+z>2, wherein A represents an electron-withdrawing group, and B represents an electron-donating group, wherein A represents an electron-withdrawing group, Ar represents a divalent group including an aromatic ring, Ar′ represents a tetravalent group including an aromatic ring, R represents a hydrogen atom or a hydrocarbon group, W represents an electron-withdrawing group or an electron-donating group, p represents an integer of 0 to 4, and q represents an integer of 1 to 1000, wherein A represents an electron-withdrawing group, B represents an electron-donating group, and m represents an integer of 0 to 200.