Patent ID: 7862980

Claim:
A salt represented by the formula (I): wherein P 1 , P 2 and P 3 each independently represent a C1-C30 alkyl group which may be substituted with at least one selected from a hydroxyl group, a C3-C12 cyclic hydrocarbon group and a C1-C12 alkoxy group, or a C3-C30 cyclic hydrocarbon group which may be substituted with at least one selected from a hydroxyl group and a C1-C12 alkoxy group, provided that all of P 1 , P 2 and P 3 are not simultaneously phenyl groups which may be substituted, Q 1 and Q 2 each independently represent a fluorine atom or a C1-C6 perfluoroalkyl group, and R represents a group represented by the formula; wherein ring X 1 represents a C3-C30 monocyclic or polycyclic hydrocarbon group in which one â€”CH 2 â€” group is substituted with â€”COâ€”, and at least one hydrogen atom in the monocyclic or polycyclic hydrocarbon group may be substituted with a C1-C6 alkyl group, a C1-C6 alkoxy group, a C1-C4 perfluoroalkyl group, a C1-C6 hydroxyalkyl group, a hydroxyl group or a cyano group; a group represented by the formula: wherein ring X 2 represents a C3-C30 monocyclic or polycyclic hydrocarbon group in which a hydrogen atom of one â€”CH 2 â€” group is substituted with a hydroxyl group, and at least one hydrogen atom in the monocyclic or polycyclic hydrocarbon group may be substituted with a C1-C6 alkyl group, a C1-C6 alkoxy group, a C1-C4 perfluoroalkyl group, a C1-C6 hydroxyalkyl group, a hydroxyl group or a cyano group; a group represented by the formula: wherein ring X 3 represents a C3-C30 monocyclic or polycyclic hydrocarbon group in which one â€”CH 2 â€” group is substituted, with â€”COOâ€”, and at least one hydrogen atom in the monocyclic or polycyclic hydrocarbon group may be substituted with a C1-C6 alkyl group, a C1-C6 alkoxy group, a C1-C4 perfluoroalkyl group, a C1-C6 hydroxyalkyl group, a hydroxyl group or a cyano group, and m represents an integer of 0 to 12; or a group represented by the formula: wherein ring X 4 represents a C6-C30 polycyclic hydrocarbon group having tricycle or more, and at least one hydrogen atom in the polycyclic hydrocarbon group may be substituted with a C1-C6 alkyl group, a C1-C6 alkoxy group, a C1-C4 perfluoroalkyl group or a cyano group, and l represents an integer of 1 to 12.