Kawasaki Kasei Chemicals Ltd.

Shuji Yokoyama

Shigeaki Numata

Akihiko Yamada

Yasuaki Miki

Tatsuki Takeuchi

To provide a photopolymerization sensitizer which will not cause problems of dusting or coloring of a cured product by bleeding of additives such as the photopolymerization sensitizer on the surface e.g. by blooming at the time of photo-curing or during storage of the cured product, and which imparts a practically sufficient photo-curing rate. An oligomer of a 9,10-bis(substituted oxy)anthracene compound having repeating units represented by the following formula (1): wherein n represents a repetition number and is from 2 to 50, each of X and Y which may be the same or different, is a hydrogen atom, a Calkyl group or a halogen atom, and A is a bivalent substituent.

Polymer photopolymerization sensitizer

To provide a photopolymerizable composition which can be quickly cured by light of from 300 nm to 450 nm, and a cured product of which is less colored. A photopolymerization sensitizer composition containing a compound represented by the following formula (1) and a compound, of which the maximum value of an absorption coefficient in a wavelength region ranging from at least 400 nm to at most 500 nm is higher than the maximum value of an absorption coefficient in a wavelength region ranging from at least 400 nm to at most 500 nm of said compound; and a photopolymerizable composition containing the photopolymerization sensitizer composition. In the formula (1), Ris a Calkyl group, a Caryl group, a Calkoxy group or a Caryloxy group, and each of Xand Ywhich may be the same or different, is a hydrogen atom or a Calkyl group 

Photopolymerization sensitizer composition and photopolymerizable composition comprising the same

To provide a photopolymerizable composition which can be quickly cured by light of from 300 nm to 500 nm, and a cured product of which is less colored. A photopolymerizable composition comprising a compound having an anthracene skeleton represented by the following formula (1), a compound having a benzophenone skeleton and a radical polymerizable compound: wherein each of Rand Rwhich may be the same or different, is a Calkyl 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, or an aryloxycarbonyl group having a Caryl group, and each of X and Y which may be the same or different, is a hydrogen atom or a Calkyl group.

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Kawasaki, Japan

Shuji Yokoyama