Patent ID: 7396899

Claim:
A polymeric compound comprising a structural unit of the formula (Ib) wherein Q 11 and Q 12 each independently represent alkyl having 1 to 6 carbon atoms or cycloalkyl having 3 to 10 carbon atoms, or Q 11 and Q 12 bond to form divalent acyclic hydrocarbon having 3 to 7 carbon atoms which form a ring together with the adjacent S + ; Q 8 , Q 13 , Q 16 and Q 17 each independently represent hydrogen or methyl; n 11 denotes 0 or natural number; and Q 15 represents perfluoroalkyl having 1 to 8 carbon atoms, alkyl having 1 to 8 carbon atoms or aromatic group having 6 to 12 carbon atoms which may be substituted, or camphor group.