POLYMERIZATION INITIATOR MIXTURE, POLYMERIZABLE COMPOSITION, CURED OBJECT AND PRODUCTION METHOD OF CURED OBJECT

To provide a radical polymerization initiator mixture comprising photo-polymerizability capable of preferably curing both of a depth to which light hardly reaches, and a surface which is easily subjected to curing inhibition due to oxygen, in photo-curing of a photo-polymerizable composition formed of a polymerization initiator and a radical polymerizable compound.SOLUTION: There is provided a polymerization initiator mixture which contains a triazine peroxide derivative expressed by a following formula (1) and an α-hydroxyketone based photo polymerization initiator, in which the triazine peroxide derivative is included by 60 mass% or greater and 95 mass% or lower, and the α-hydroxyketone based photo polymerization initiator is included by 5 mass% or greater and 40 mass% or lower.SELECTED DRAWING: None 【課題】重合開始剤とラジカル重合性化合物からなる光重合性組成物の光硬化において、光の届きにくい深部及び酸素による硬化阻害を受けやすい表面の両方を良好に硬化できる光重合性を持つラジカル重合開始剤混合物を提供すること。【解決手段】下記一般式（１）で表されるトリアジンペルオキシド誘導体と、α－ヒドロキシケトン系光重合開始剤を含有し、前記トリアジンペルオキシド誘導体が６０質量％以上９５質量％以下であり、前記α－ヒドロキシケトン系光重合開始剤が５質量％以上４０質量％以下である重合開始剤混合物。JPEG2022069041000014.jpg51119【選択図】なし