A light-sensitive composition which comprises at least one compound represented by the following general formula (I) as light-free radical generator:
S-L-A (I)
in formula (I), S represents a light absorbing moiety which absorbs light having a wave length of not less than 300 nm with an absorptivity coefficient of not less than 1000, A represents an active moiety which interacts with the light absorbing moiety S in an excited state to generate free radicals and L represents a group for coupling the moieties S and A; and a photopolymerizable composition which comprises at least one radical polymerizable compound having ethylenically unsaturated group, at least one compound represented by the foregoing general formula (I) as a light-free radical generator and optionally at least one linear organic high molecular weight polymer. The light-sensitive composition or the photo-polymerizable composition shows high sensitivity to actinic rays having a wave length ranging from near ultraviolet to visible region or further to near infrared region. Therefore, the composition can be imagewise exposed to light from a variety of light sources.
一种光敏组合物,它包含至少一种由下式通式(I)代表的化合物作为无光自由基发生器:
S-L-A (I)
式(I)中,S 代表光吸收分子,它吸收波长不小于 300 nm、吸收系数不小于 1000 的光;A 代表活性分子,它在激发态下与光吸收分子 S 相互作用以产生自由基;L 代表用于偶联分子 S 和 A 的基团;以及一种可光聚合的组合物,它包括至少一种具有
乙烯不饱和基团的可自由基聚合的化合物,至少一种由前述通式(I)代表的化合物作为无光自由基发生器,以及可选的至少一种线性有机高分子量聚合物。光敏组合物或可光聚合组合物对波长范围从近紫外线到可见光区或更远的近红外区的放 射线具有高灵敏度。因此,这种组合物可以在各种光源的照射下成像。