Patent ID: 8530138

Claim:
A salt represented by the formula (I): wherein Q 1 and Q 2 independently each represent a fluorine atom or a C1-C6 perfluoroalkyl group, L 1 and L 2 independently each represent a C1-C17 divalent saturated hydrocarbon group in which one or more —CH 2 — can be replaced by —O— or —CO—, ring W 1 and ring W 2 independently each represent a C3-C36 aliphatic ring, R 2 is independently in each occurrence a C1-C6 alkyl group, R 4 is independently in each occurrence a C1-C6 alkyl group, R 3 represents a C1-C12 hydrocarbon group, t represents an integer of 0 to 2, u represents an integer of 0 to 2, and Z + represents an organic counter ion.