Onium salt, blocking agent dissociation catalyst for blocked isocyanate, blocked isocyante composition including blocking agent dissociation catalyst, thermosetting resin composition, and cured product and manufacturing method therefor

An onium salt represented by the following formula (1):

• wherein
• n represents an integer of 1 or more,
• R1, R2, and R3 are the same or different, and each represents a hydrogen atom or a substituted or unsubstituted hydrocarbon group,
• A represents a hydrogen atom or a substituted or unsubstituted hydrocarbon group when n=1, and represents a substituted or unsubstituted n-valent hydrocarbon group when n represents an integer of 2 or more,
• wherein some or all of R1, R2, and R3 may be bonded together to form one or more ring structures,
• X represents a carbon atom, a nitrogen atom, or an oxygen atom,
• a represents 0 or 1,
• b represents 0 or 1,
• wherein when X represents a carbon atom, a=1 and b=1, when X represents a nitrogen atom, a=1 and b=0, and when X represents an oxygen atom, a=0 and b=0, and
• Q+ represents an organic cation represented by the following formula (2) or formula (3):
• wherein
• R4, R5, R6, and R7 are the same or different, and each represents a substituted or unsubstituted hydrocarbon group, wherein some or all of R4, R5, R6, and R7 may be bonded together to form one or more ring structures, and
• Y+ represents a nitrogen cation or a phosphorus cation;
• wherein
• R8, R9, and R11 are the same or different, and each represents a substituted or unsubstituted hydrocarbon group,
• R10 represents a hydrogen atom or a substituted or unsubstituted hydrocarbon group, wherein some or all of R8, R9, R10, and R11 may be bonded together to form one or more ring structures, and
• Z+ represents a nitrogen cation or a phosphorus cation;
• with the proviso that 1,3-di-isopropyl-4,5-dimethylimidazolium N,N′-diphenylureate is excluded.