Patent ID: 7812194

Claim:
An iodonium or sulfonium salt of a sulfonic acid represented by formula (X): wherein R 1a to R 13a each independently represents a hydrogen atom, an alkyl group, a haloalkyl group, a halogen atom or a hydroxyl group; A 1 and A 2 , which may be the same or different, each represents a hetero atom-containing divalent linkage group selected from the group consisting of —S—, —CO—, —CONR—, —SO 2 NR—, —CONRCO—, —SO 2 NRCO—, —SO 2 NRSO 2 — and —OCONR—; wherein R represents a hydrogen atom, or an alkyl group having 1 to 10 carbon atoms, which may be substituted with a halogen atom, a hydroxyl group or an alkoxy group; or R may combine with one of the R 1a to R 13a groups to form a ring; m 1 to m 5 , which may be the same or different, each represents an integer of 0 to 12; and p represents an integer of 0 to 4.