| 摘要 |
PURPOSE:To increase the sensitively by using an specified triphenylimidazole dimer as a photooxidizing agent. CONSTITUTION:When a photosensitive composition is composed of a fixing layer consisting of a fixing agent and a binder, and a color developing layer consisting of an oxidizable leucotriarylmethane dye as a coupler, a photooxidizing agent, an auxiliary coupler and a binder, a 2,4,5- triphenylimidazole dimer represented by formula I is used as the photooxidizing agent. The resulting photosensitive composition is suitable for use as a material for a PS plate, a material for preventing the lap exposure of a photoresist or confirming the position of a photomask or a material for proof. The fixing layer can properly be selected according to the purpose for which the photosensitive composition is used. An intermediate layer made of a resin film may be interposed between the fixing layer and the photosensitive layer as required. A strong acid or polyether is effective as the auxiliary coupler. |
