Silver halide photographic material and image forming method usi

Details Silver halide photographic material and image forming method usi Silver halide photographic material and image forming method usi

Filed on

1989-05-15

Date issued

1990-04-24

Examiner

Michl, Paul R.

Patent Class

Radiation imagery chemistry: process, composition, or product th

SubClass

Silver halide colloid tanning process, composition, or product

Other Related Categories

430502, 430571, 430949, G03C 106

Type

Patent

Status

active

Patent number

049200348

Description

ABSTRACT:
A silver halide photographic material and an image forming method using such material are described, said material comprising a surface latent image forming silver halide emulsion layer unit on a support, and containing a hydrazine compound in at least one of said emulsion layer unit and other constituent layers, said emulsion layer unit being composed of at least two layers, with the silver halide emulsion present in a fine-grained low-sensitivity emulsion layer having a minimum average grain size being not more than 80% of the average grain size of a coarse-grained high-sensitivity silver halide emulsion having the maximum average grain size, and said silver halide photographic material attains a contrast of 10 or more in terms of gamma value when a developer containing at least 0.15 mol/liter of sulfite ions and having a pH of from 9.5 to 12.3 is used.

REFERENCES:
patent: 3888676 (1975-06-01), Evans
patent: 4209329 (1980-06-01), Lohner
patent: 4506008 (1985-03-01), Sugimoto et al.
patent: 4560638 (1985-12-01), Loblaw et al.
patent: 4681836 (1987-07-01), Inoue et al.
patent: 4761362 (1988-08-01), Sasaoka et al.

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