Photographic emulsions and materials with reduced pressure sensi

Details Photographic emulsions and materials with reduced pressure sensi Photographic emulsions and materials with reduced pressure sensi

1993-07-06

1995-08-08

Baxter, Janet C.

Radiation imagery chemistry: process, composition, or product th

Radiation sensitive product

Silver compound sensitizer containing

430599, G03C 1035, G03C 108

Patent

active

054397863

ABSTRACT:
Disclosed is a negative-working, silver halide emulsion including monodispersed, non-twinned, non-tabular silver halide crystals having a core and a shell. The core has a first halide composition including silver chloride, silver bromide or silver chlorobromide containing at least 65% silver bromide. The shell has a second halide composition, different from the first composition, including silver chloride, silver bromide or silver chlorobromide, provided that: (a) the minimum difference in shell to core halide composition relative to the same halide, is as follows: (i) 0.5 mole % when the core is silver bromide, (ii) 10 mole % when the core is silver chloride, and (iii) 10 mole % when the core is silver chlorobromide; (b) the core represents from about 5 to about 50% of the total crystal volume; and (c) the shell contains no more than 50 mole % silver chloride. The emulsion also has a chemically sensitized surface, and substantially reduced black or white pressure sensitivity compared with homogeneous silver bromide or silver chlorobromide emulsions.

REFERENCES:
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patent: 4963467 (1990-10-01), Ishikawa et al.
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patent: 4977075 (1990-12-01), Ihama et al.
patent: 4983509 (1991-01-01), Inoue et al.
patent: 5124244 (1992-06-01), Waki et al.
Research Disclosure 308119, Dec. 1989.

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