Compound having polycyclic aromatic skeleton, and endoperoxide compound of same

A heat radical polymerization initiator, comprising:

• an endoperoxide compound of formula (1):
• wherein
• R is a C1-10 alkyl group, an alkoxymethyl group comprising a C1-5 alkoxy group, a C6-10 aryl group, an alkylcarbonyl group comprising a C1-10 alkyl group, an arylcarbonyl group comprising a C6-20 aryl group, an alkyloxycarbonyl group comprising a C1-10 alkyl group, an aryloxycarbonyl group comprising a C6-10 aryl group, an alkyloxycarbonylmethyl group comprising a C1-12 alkyl group, or an aryloxycarbonylmethyl group comprising a C6-12 aryl group, and
• each of Y1 and Y2 is H, a C1-8 alkyl group, or a halogen atom.

A method for curing a radical polymerizable composition, the method comprising:

• irradiating a radical polymerizable composition comprising a compound of formula (2):
• R being a C1-10 alkyl group, an alkoxymethyl group comprising a C1-5 alkoxy group, a C6-10 aryl group, an alkylcarbonyl group comprising a C1-10 alkyl group, an arylcarbonyl group comprising a C6-20 aryl group, an alkyloxycarbonyl group comprising a C1-10 alkyl group, an aryloxycarbonyl group comprising a C6-10 aryl group, an alkyloxycarbonylmethyl group comprising a C1-12 alkyl group, or an aryloxycarbonylmethyl group comprising a C6-12 aryl group, and Y1 and Y2 each being H, a C1-8 alkyl group, or a halogen atom;
• and a radical polymerizable compound, with ultraviolet rays in the presence of oxygen to produce an endoperoxide compound of formula (1):
• R being a C1-10 alkyl group, an alkoxymethyl group comprising a C1-5 alkoxy group, a C6-10 aryl group, an alkylcarbonyl group comprising a C1-10 alkyl group, an arylcarbonyl group comprising a C6-20 aryl group, an alkyloxycarbonyl group comprising a C1-10 alkyl group, an aryloxycarbonyl group comprising a C6-10 aryl group, an alkyloxycarbonylmethyl group comprising a C1-12 alkyl group, or an aryloxycarbonylmethyl group comprising a C6-12 aryl group, and Y1 and Y2 each being, a C1-8 alkyl group, or a halogen atom;
• and
• conducting a polymerization reaction using the endoperoxide compound as a photoradical polymerization initiator and/or a heat radical polymerization initiator.