Patent ID: 8110336

Claim:
A resin comprising a structural unit represented by the formula (I): wherein Q 1 and Q 2 each independently represent a fluorine atom or a C1-C6 perfluoroalkyl group, U represents a C1-C20 divalent hydrocarbon group in which one or more —CH 2 — may be replaced by —O—, —NH—, —S—, —NR c —, —CO— or —CO—O—, R c represents a C1-C6 alkyl group, X 1 represents —O—CO—, —CO—O—, —CO—OCH 2 —, —CH 2 —O—CO—, —O—CH 2 —, —CH 2 —O—, —NR d —CO— or —CO—NR d —, R d represents a hydrogen atom or a C1-C6 alkyl group, and A + represents an organic counter ion.