Patent ID: 8765351

Claim:
A salt represented by the formula (X): wherein Q 1 and Q 2 each independently represent a fluorine atom or a C1-C6 perfluoroalkyl group, L 1 represents a C1-C17 divalent saturated hydrocarbon group in which one or more —CH 2 —can be replaced by —O— or —CO—, ring W 1 represents a C4-C36 lactone ring, R 3 is independently in each occurrence a C1-C6 alkyl group or a C1-C6 alkoxy group, t represents an integer of O to 2, Z + represents an organic counter ion, and W 10 represents a group represented by the formula (X-1): wherein L 2 represents a single bond or —O—(CH 2 ) 1 —CO— in which one or more —CH 2 — can be replaced by —O— or —CO— and 1 represents an integer of 0 to 6, ring W 2 represents a C3-C36 saturated hydrocarbon ring in which one —CH 2 — is replaced by —CO— and in which one or more —CH 2 — can be replaced by —O— or —CO—, R 1 represents a C1-C12 hydrocarbon group, R 2 is independently in each occurrence a C1-C6 alkyl group or a C1-C6 alkoxy group, and s represents an integer of 0 to 2.