Curable composition, cured product of the curable composition, and method of producing a cured product using the curable composition

A curable composition comprising a cationic polymerization initiator (A) and an aromatic vinyl ether compound (B),

• the aromatic vinyl ether compound (B) comprising an aromatic group substituted with a vinyloxy group,
• the cationic polymerization initiator (A) comprising a sulfonium salt represented by the following formula (a1):
• wherein R1 and R2 independently represent a group represented by the following formula (a2);
• R1 and R2 may be bonded to each other to form a ring together with the sulfur atom in the formula;
• R3 represents a group represented by the following formula (a3) or a group represented by the following formula (a4);
• A1 represents S, O, or Se;
• X− represents a monovalent anion;
• and wherein both of R1 and R2 do not represent an alkyl group optionally substituted with a halogen atom,
• wherein a ring Z1 represents an aromatic hydrocarbon ring;
• R4 represents an alkyl group optionally substituted with a halogen atom, a hydroxy group, an alkoxy group, an alkylcarbonyl group, an alkoxycarbonyl group, an acyloxy group, an alkylthio group, a thienyl group, a thienylcarbonyl group, a furanyl group, a furanylcarbonyl group, a selenophenyl group, a selenophenylcarbonyl group, a heterocyclic aliphatic hydrocarbon group, an alkylsulfinyl group, an alkylsulfonyl group, a hydroxy(poly)alkyleneoxy group, an optionally substituted amino group, a cyano group, a nitro group, or a halogen atom;
• and m1 represents an integer of 0 or more,
• wherein R5 represents an alkylene group optionally substituted with a hydroxy group, an alkoxy group, an alkylcarbonyl group, an arylcarbonyl group, an alkoxycarbonyl group, an aryloxycarbonyl group, an arylthiocarbonyl group, an acyloxy group, an arylthio group, an alkylthio group, an aryl group, a heterocyclic hydrocarbon group, an aryloxy group, an alkylsulfinyl group, an arylsulfinyl group, an alkylsulfonyl group, an arylsulfonyl group, a hydroxy(poly)alkyleneoxy group, an optionally substituted amino group, a cyano group, a nitro group, or a halogen atom or a group represented by the following formula (a5);
• R6 represents an alkyl group optionally substituted with a hydroxy group, an alkoxy group, an alkylcarbonyl group, an arylcarbonyl group, an alkoxycarbonyl group, an aryloxycarbonyl group, an arylthiocarbonyl group, an acyloxy group, an arylthio group, an alkylthio group, an aryl group, a heterocyclic hydrocarbon group, an aryloxy group, an alkylsulfinyl group, an arylsulfinyl group, an alkylsulfonyl group, an arylsulfonyl group, a hydroxy(poly)alkyleneoxy group, an optionally substituted amino group, a cyano group, a nitro group, or a halogen atom or a group represented by the following formula (a6);
• A2 represents a single bond, S, O, a sulfinyl group, or a carbonyl group;
• and n1 represents 0 or 1,
• wherein R7 and R8 independently represent an alkylene group optionally substituted with a hydroxy group, an alkoxy group, an alkylcarbonyl group, an arylcarbonyl group, an alkoxycarbonyl group, an aryloxycarbonyl group, an arylthiocarbonyl group, an acyloxy group, an arylthio group, an alkylthio group, an aryl group, a heterocyclic hydrocarbon group, an aryloxy group, an alkylsulfinyl group, an arylsulfinyl group, an alkylsulfonyl group, an arylsulfonyl group, a hydroxy(poly)alkyleneoxy group, an optionally substituted amino group, a cyano group, a nitro group, or a halogen atom or a group represented by the following formula (a5);
• R9 and R10 independently represent an alkyl group optionally substituted with a halogen atom or a group represented by the formula (a2);
• R9 and R10 may be bonded to each other to form a ring together with the sulfur atom in the formula;
• A3 represents a single bond, S, O, a sulfinyl group, or a carbonyl group;
• X− is the same as defined above;
• n2 represents 0 or 1;
• and not both of R9 and R10 are an alkyl group optionally substituted with a halogen atom)
• wherein a ring Z2 represents an aromatic hydrocarbon ring;
• R11 represents an alkyl group optionally substituted with a halogen atom, a hydroxy group, an alkoxy group, an alkylcarbonyl group, an arylcarbonyl group, an alkoxycarbonyl group, an aryloxycarbonyl group, an arylthiocarbonyl group, an acyloxy group, an arylthio group, an alkylthio group, an aryl group, a heterocyclic hydrocarbon group, an aryloxy group, an alkylsulfinyl group, an arylsulfinyl group, an alkylsulfonyl group, an arylsulfonyl group, a hydroxy(poly)alkyleneoxy group, an optionally substituted amino group, a cyano group, a nitro group, or a halogen atom;
• and m2 represents an integer of 0 or more,
• wherein a ring Z3 represents an aromatic hydrocarbon ring;
• R12 represents an alkyl group optionally substituted with a halogen atom, a hydroxy group, an alkoxy group, an alkylcarbonyl group, an arylcarbonyl group, an alkoxycarbonyl group, an aryloxycarbonyl group, an arylthiocarbonyl group, an acyloxy group, an arylthio group, an alkylthio group, a thienylcarbonyl group, a furanylcarbonyl group, a selenophenylcarbonyl group, an aryl group, a heterocyclic hydrocarbon group, an aryloxy group, an alkylsulfinyl group, an arylsulfinyl group, an alkylsulfonyl group, an arylsulfonyl group, a hydroxy(poly)alkyleneoxy group, an optionally substituted amino group, a cyano group, a nitro group, or a halogen atom;
• and m3 represents an integer of 0 or more).