Kawasaki Kasei Chemicals Ltd.

Yokohama National University

Keita Iuchi

Shunichi Himori

Akihiko Yamada

Kazuhisa Sakakibara

Hiroaki Gotoh

A radical polymerization method may use a compound having a polycyclic aromatic skeleton and an endoperoxide compound having a polycyclic aromatic skeleton. An endoperoxide compound may have a polycyclic aromatic skeleton of formula (1), and a compound may have a polycyclic aromatic skeleton, which is a raw material of the endoperoxide compound: wherein R is a Calkyl group, an alkoxymethyl group having a Calkoxy group, a Caryl group, an alkylcarbonyl group having a Calkyl group, an arylcarbonyl group having a Caryl group, an alkyloxycarbonyl group having a Calkyl group, an aryloxycarbonyl group having a Caryl group, an alkyloxycarbonylmethyl group having a Calkyl group or an aryloxycarbonylmethyl group having a Caryl group.

Compound having polycyclic aromatic skeleton, and endoperoxide compound of same

A conventional polymerization inhibitor is for example an agent to scavenge radicals generated during storage of a radical polymerizable compound and used to stably handle the radical polymerizable compound, but is unnecessary when the radical polymerizable compound is to be subjected to radical polymerization reaction, and is preferably removed at the time of the radical polymerization reaction. The object of the present invention is to obviate inconvenience of removing the polymerization inhibitor at the time of radical polymerization. The radical polymerization control agent contained in a radical polymerizable composition of the present invention functions as a radical polymerization inhibitor for example stored in a dark place, but loses its radical polymerization inhibiting effect when polymerization is initiated while being irradiated with light at a certain specific wavelength at the time of polymerization. Thus, radical polymerization of the radical polymerizable compound is easily initiated without increasing the amount of a radical polymerization initiator. That is, the radical polymerization control agent of the present invention is a radical polymerization control agent which is a corn pound having an effect to inhibit radical polymerization of a radical polymerizable compound and which loses the radical polymerization inhibiting effect under irradiation with light rays containing light within a wavelength range of from 300 nm to 500 nm.

Radical polymerization control agent and radical polymerization control method

The purpose of the present invention is to provide a photopolymerizable composition which can act as a photopolymerization sensitizer that is active against light having a wavelength falling within a wavelength range of from 300 to 500 nm, and which has such a property that coloring of a cured product produced by polymerizing a photopolymerizable composition containing the photopolymerization sensitizer is less. A photopolymerization sensitizer composition characterized by comprising a photopolymerization sensitizer containing an alkoxyanthracene compound represented by the formula (1) and a singlet oxygen quencher; and a photopolymerizable composition containing the photopolymerization sensitizer composition: in the formula (1), n represents an integer of 1 or 2; R represents a Calkyl group; and X represents a hydrogen atom or a Calkyl group.

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Kawasaki, Japan

Keita Iuchi