Novel co-initiator compositions for use in improved photopolymerizable compositions, photopolymerizable compositions and elements are disclosed. The co-initiator compositions comprise a photopolymerization activator and a 3-keto-substituted coumarin sensitizer which has maximum absorption of radiation between 250 and 550 nm. The coumarin sensitizer has a
substituent in the 3-position. R' is an aromatic carbocyclic or heterocyclic group conjugated with the carbonyl directly or through an alkenylene group.
Particularly useful co-initiator compositions comprise an amine-substituted ketocoumarin and an activator selected from certain amino-derivatives of acetic acid.
本发明公开了用于改进型光聚合组合物、光聚合组合物和元件的新型共
引发剂组合物。这些共
引发剂组合物包括一种光聚合激活剂和一种 3-酮取代的
香豆素敏化剂,后者对辐射的最大吸收波长在 250 至 550 纳米之间。
香豆素敏化剂的
3 位的取代基。R' 是直接或通过烯基与羰基共轭的芳香碳环或杂环基团。
特别有用的辅助
引发剂组合物包括胺取代的酮
香豆素和选自某些
乙酸氨基衍
生物的活化剂。