SILVER HALIDE EMULSION, SILVER HALIDE PHOTOGRAPHIC SENSITIVE MATERIAL, AND METHOD OF IMAGE FORMATION

WIPO Patent Application WO/2004/068238

A1

A silver halide emulsion which has high sensitivity, reduced fogging, and a high gamma value regardless of exposure mode, is excellent in storage stability and latent-image stability, and enables high-quality prints to be always obtained stably and which is excellent especially in latent-image stability in digital exposure where the photographic sensitive material is exposed at a high luminance for a short time. The silver halide emulsion contains silver halide particles having a silver chloride content of 90 mol% or higher, a silver iodide content of 0 to 2.0 mol%, and a silver bromide content of 0.02 to 5.0 mol% and containing therein two or more Group 8 metal compounds including one or more iridium compounds. The emulsion is characterized in that the silver halide particles have been chemically sensitized in the presence of a polysulfide compound represented by the following general formula (1): General formula (1) (wherein A represents a group of atoms necessary for forming a 5- or 6-membered heterocycle containing at least one of -O-, -S-, -N-, -SO₂-, -CO-, and -NR₃₁CO-, provided that R₃₁ represents hydrogen or a substituent; and n is 3 or 4).

KONDO TOSHIYA (JP)
KURODA KOICHIRO (JP)
TANAKA TATSUO (JP)

PCT/JP2003/000989

August 12, 2004

January 31, 2003

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KONISHIROKU PHOTO IND (JP)
KONDO TOSHIYA (JP)
KURODA KOICHIRO (JP)
TANAKA TATSUO (JP)

G03C1/035; G03C1/09; G03C1/34; (IPC1-7): G03C1/34; G03C1/035; G03C1/06; G03C1/09

JP2000131788A	2000-05-12
US20020102505A1	2002-08-01
EP1220023A2	2002-07-03
JP2002148750A	2002-05-22
EP0488737A1	1992-06-03
US5866315A	1999-02-02

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