Patent ID: 7862953

Claim:
A solid polymer electrolyte membrane comprising a compound having one or more side chains and a main chain, wherein the side chain comprises a structure represented by Formula II and the main chain comprises a structure represented by Formula III: wherein R 5 represents a substituted or unsubstituted alkyl group having 1 to 6 carbon atoms or a hydrogen atom; X represents â€”SO 3 H, â€”PO 3 H 2 , â€”PO 4 H 2 , â€”R 8 SO 3 H, â€”R 8 PO 3 H 2 , or â€”R 8 PO 4 H 2 , where R 8 represents a substituted or unsubstituted alkylene group having 1 to 6 carbon atoms; R 1 represents a methyl group or a hydrogen atom; R 9 represents a substituted or unsubstituted alkanetriyl group having 2 to 10 carbon atoms; and n is an integer of 1 to 5 and m is an integer of 0 to 4, where n+m is 5.