Patent ID: 7956142

Claim:
A polymerizable onium sulfonate shown by the following formula (1), wherein R 1 represents a hydrogen atom, a fluorine atom, or an alkyl group having 1 to 3 carbon atoms, in which some or all of the hydrogen atoms may be substituted by a fluorine atom, M + represents a sulfonium cation shown by the following formula (2) or an iodonium cation shown by the following formula (3), and n represents 1, wherein R 2 , R 3 , and R 4 individually represent a substituted or unsubstituted linear or branched alkyl group having 1 to 30 carbon atoms, a substituted or unsubstituted cyclic monovalent hydrocarbon group having 3 to 30 carbon atoms, a substituted or unsubstituted aryl group having 6 to 30 carbon atoms, or an unsubstituted monovalent heterocyclic organic group having 4 to 30 atoms, or two or more of R 2 , R 3 , and R 4 may bond to form a ring together with the sulfur atom in the formula (2), wherein R 5 and R 6 individually represent a substituted or unsubstituted linear or branched alkyl group having 1 to 30 carbon atoms, a substituted or unsubstituted cyclic monovalent hydrocarbon group having 3 to 30 carbon atoms, a substituted or unsubstituted aryl group having 6 to 30 carbon atoms, or an unsubstituted monovalent heterocyclic organic group having 4 to 30 carbon atoms, or R 5 and R 6 may bond to form a ring together with the iodine atom in the formula (3).