PROBLEM TO BE SOLVED: To provide a photopolymerization initiator, which has sufficient activity to light, particularly, visible light, and is reduced in the possibility of including impurities as much as possible.SOLUTION: The photopolymerization initiator comprises an &alpha-diketone such as camphoquinone, a nonpolymerizable acidic compound such as orthophosphoric acid or methylphosphoric acid, and a carbonyl group-substituted aromatic amine represented by the general formula (1) such as 4-dimethylamino benzoic acid ethyl ester or 4-dimethylaminoacetophenone, wherein R1 represents a hydrogen atom or an alkyl group, R2 represents an alkyl group, X represents a hydrogen atom, a hydroxyl group, an alkyl group, an alkoxy group, an alkylamino group, an aryl group, an aryloxy group or an arylamino group, and n represents an integer of 1-5.COPYRIGHT: (C)2009,JPO&INPIT【課題】 本発明は、光、特に可視光線に対して充分な活性を有し、且つ、可能な限り不純物を含む可能性の少ない化合物からなる光重合開始剤を提供するものである。【解決手段】 カンファーキノン等のα-ジケトン、オルトリン酸、メチルリン酸等の非重合性酸性化合物、及び、4-ジメチルアミノ安息香酸エチルエステル、4-ジメチルアミノアセトフェノン等の下記一般式(1)で示されるカルボニル基置換芳香族アミンからなる光重合開始剤。【化1】【選択図】 なし
