Patent ID: 7217492

Claim:
An onium salt compound having a cation moiety of the following formula (1), wherein A represents an iodine atom or a sulfur atom, when A is an iodine atom, m is 1 or 2 and n is 0 or 1, provided that (m+n)=2, and x is an integer of 1–10, and when A is a sulfur atom, m is 1–3 and n is 0–2, provided that (m+n)=3, and x is an integer of 1–15; Ar 1 represents a substituted or unsubstituted aromatic hydrocarbon group having 6–20 carbon atoms with a valence of 1 to (x+1) or a substituted or unsubstituted heterocyclic group having 3–20 atoms with a valence of 1 to (x+1), Ar 2 represents a substituted or unsubstituted monovalent aromatic hydrocarbon group having 6–20 carbon atoms or a substituted or unsubstituted monovalent heterocyclic group having 3–20 atoms, or Ar 1 and Ar 2 mutually bond together with A + in the formula to form a group possessing a cyclic structure with 3–8 atoms; and the x-number of P groups bonding to one or more of the m-number of Ar 1 groups individually represent —O—SO 2 R 1 , —O—S(O)R 2 , or —SO 2 R 3 , wherein R 1 , R 2 , and R 3 individually represent a hydrogen atom, a substituted or unsubstituted alkyl group having 1–20 carbon atoms, a substituted or unsubstituted monovalent alicyclic hydrocarbon group having 3–20 carbon atoms, an alkenyl group having 2–20 carbon atoms, a substituted or unsubstituted monovalent aromatic hydrocarbon group having 6–20 carbon atoms, or a substituted or unsubstituted monovalent heterocyclic group having 3–20 atoms, or a group —N(R′) 2 , wherein R′ individually represents a hydrogen atom, a substituted or unsubstituted alkyl group having 1–20 carbon atoms, a substituted or unsubstituted monovalent alicyclic hydrocarbon group having 3–20 carbon atoms, an alkenyl group having 2–20 carbon atoms, a substituted or unsubstituted monovalent aromatic hydrocarbon group having 6–20 carbon atoms, or a substituted or unsubstituted monovalent heterocyclic group having 3–20 atoms, or two R′ groups form, in combination and together with the nitrogen atom in the formula, a group having a cyclic structure with 3–8 atoms and wherein R 3 represents a hydrogen atom, a substituted or unsubstituted alkyl group having 1–20 carbon atoms, a substituted or unsubstituted monovalent alicyclic hydrocarbon group having 3–20 carbon atoms, an alkenyl group having 2–20 carbon atoms, or a substituted or unsubstituted monovalent heterocyclic group having 3–20 atoms, or a group —N(R′) 2 , wherein R′ individually represents a hydrogen atom, a substituted or unsubstituted alkyl group having 1–20 carbon atoms, a substituted or unsubstituted monovalent alicyclic hydrocarbon group having 3–20 carbon atoms, an alkenyl group having 2–20 carbon atoms, a substituted or unsubstituted monovalent aromatic hydrocarbon group having 6–20 carbon atoms, or a substituted or unsubstituted monovalent heterocyclic group having 3–20 atoms, or two R′ groups form, in combination and together with the nitrogen atom in the formula, a group having a cyclic structure with 3–8 atoms.