Light-sensitive material containing silver halide reducing agent

Details Light-sensitive material containing silver halide reducing agent Light-sensitive material containing silver halide reducing agent

1992-06-30

1993-10-12

Van Le, Hoa

Radiation imagery chemistry: process, composition, or product th

Microcapsule, process, composition, or product

430617, 430619, 430955, G03C 172

Patent

active

052524230

ABSTRACT:
A light-sensitive material comprises a support and a light-sensitive layer provided thereon which contains silver halide, a reducing agent, a polymerizable compound, a color image forming substance and a base precursor. The silver halide, the reducing agent, the polymerizable compound, the color image forming substance and the base pre cursor are contained in microcapsules which are dispersed in the light-sensitive layer. According to the present invention, the color image forming substance is a coloredsubstance, namely a dye or a pigment, and the microcapsules further contain a polar compound such as an alcohol, an ether, an amide, an urea, an urethane and a sulfonamide. Most of the polar compounds preferably have a molecular weight in the range of 100 to 400. An exceptional polar compound is polyethylene glycol or its derivative, which preferably has a molecular weight in the range of 200 to 20,000. The polar compound has a function of preventing the base precursor from decomposition, which is accelerated by the dye or pigment. The polar compound is preferably attached on the surface of the particles of the base precursor.

REFERENCES:
patent: 3347675 (1967-10-01), Henn et al.
patent: 4758496 (1988-07-01), Kakimi
patent: 4891295 (1990-01-01), Kakimi
patent: 4927731 (1990-05-01), Takahashi
patent: 4939064 (1990-07-01), Nakamura

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