A photopolymerizable composition comprising an addition-polymerizable compound having at least one ethylenically unsaturated double bond and a photopolymerization initiator, characterized in that the initiator comprises (a) a compound of the formula:
wherein R1 and R2 are alkyl group, n is 1, 2 or 3 and ring A is an aromatic ring containing nitrogen atom, and (b) hexaarylbiimidazole. The initiator may additionally contain a thiol of the formula:
wherein Z is -0-, -S- or -NH-. The composition is not only highly sensitive to ultraviolet ray but also highly stable in storage.
一种可光聚合的组合物,包括至少有一个
乙烯不饱和双键的可加成聚合的化合物和一种光聚合
引发剂,其特征在于
引发剂包括(a)式中R1和R2为烷基,n为1、2或3,环A为含氮原子的芳香环的化合物,和(b)六芳基比
咪唑。
引发剂还可含有式中Z为-0-、-S-或-NH-的
硫醇。 该组合物不仅对紫外线高度敏感,而且在储存中高度稳定。