PRODUCTION OF NEGATIVE TYPE PLANOGRAPHIC PRINTING PLATE

摘要

PURPOSE:To eliminate fogging at the time of forming metallic images and to obtain the sufficient metallic image forming speed and image strength in high-temp. rapid processing by an automatic developing machine by incorporating a specific compd. into a photosensitive photographic element. CONSTITUTION:The compd. expressed by the formula I is incorporated into the photosensitive photographic element. In the formula I, n denotes >=1 integer; m denotes a hydrogen atom or alkaline metal. Namely, the development acceleration effect by the compd. expressed by the formula I is admitted when the photosensitive photographic element is subjected to a development processing after image exposing. The speed of forming the metallic images is thereby highly accelerated and the secure metallic images having excellent printing resistance are obtd. when this element is used as a printing plate.