Silver halide photosensitive material for plate making and its density reduction method

Abstract

Abstract PURPOSE:To provide a density reduction process having superior aptitude to reduction process and wide reduction latitude despite use of a photosensitive material for plate making small in content of spread silver by incorporating a polymer contg. specified monomer units as a constituent element in the upper nonphotosensitive layer formed on a photosensitive silver halide emulsion layer. CONSTITUTION:At least one of upper nonphotosensitive layers formed on a photosensitive silver halide emulsion layer contains as a constituent component (component A) monomer units each having at least one electrostatic charge, and monomer units (component B) each having a functional group capable of cross- linking through a gelatin hardening agent to each other or gelatin. The monomer unit (component B) is obtained by copolymerizing a nucleophilic monomer having a functional group of <=9.5 in pKa. The silver halide photosensitive material contg. said polymer is exposed, developed, and reduced in density. At that time, it has good compatibility with gelatin, and does not shorten a pot life, and causes no reticulation. As a result, superior reduction aptitude is obtained, a reduction effect is not deteriorated even in a low content of spread silver, and reduction latitude is enlarged.

Inventors

• 👤 Taku Nakamura
• 👤 卓 中村
• 👤 Yasuo Kasama
• 👤 笠間　康夫

Bibliographic Details