Patent ID: 7101918

Claim:
A hybrid type onium salt of formula [1]: wherein R 1 to R 3 are each independently a halogen atom, an alkyl group, a haloalkyl group, an aryl group, an alkoxy group, an aryloxy group, an alkylthio group, an arylthio group or an amino group which may be substituted; Q 1 is a direct-linkage, an oxygen atom, a sulfur atom or an alkylene chain having 1 to 6 carton atoms; T 1 is an alkylene group or an arylene group, which may have a substituent selected from the group consisting of a halogen atom, an alkyl group, a haloalkyl group, an aryl group, an alkoxy group, an aryloxy group, an alkylthio group, an arylthio group and an amino group which may be substituted; and R 4 is an alkyl group, an alkenyl group, an aryl group or an aralkyl group, which may have a substituent selected from the group consisting of a halogen atom, an alkyl group, a haloalkyl group, an aryl group, an alkoxy group, an aryloxy group, an alkylthio group, an arylthio group and an amino group which may be substituted, or a group of formula [2]: wherein R 5 to R 7 are each independently a halogen atom, an alkyl group, a haloalkyl group, an aryl group, an alkoxy group, an aryloxy group, an alkylthio group, an arylthio group or an amino group which may be substituted; Q 2 is a direct-linkage, an oxygen atom, a sulfur atom or an alkylene chain having 1 to 6 carbon atoms; T 2 is an alkylene group or an arylene group, which may have a substituent selected from the group consisting of a halogen atom, an alkyl group, a haloalkyl group, an aryl group, an alkoxy group, an aryloxy group, an alkylthio group, an arylthio group and an amino group which may be substituted; A 3 is a counter anion; m is an integer of 0 to 4; and each n independently is an integer of 0 to 5; A 1 and A 2 are each independently a counter anion; m of formula 1 is an integer of 0 to 4; and each n of formula 1 independently is an integer of 0 to 5.