Title:
PHOTOGRAPHIC EMULSIONS AND MATERIALS WITH REDUCED PRESSURE SENSITIVITY
Document Type and Number:
WIPO Patent Application WO1993010482
Kind Code:
A3
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.
Inventors:
KLINGER GUENTHER H (US)
LEVIT ALBERT B (US)
MACGREGOR PAUL T (US)
HALLENBECK LAWRENCE E (US)
LEVIT ALBERT B (US)
MACGREGOR PAUL T (US)
HALLENBECK LAWRENCE E (US)
Application Number:
PCT/US1992/009664
Publication Date:
February 03, 1994
Filing Date:
November 12, 1992
Export Citation:
Assignee:
INT PAPER CO (US)
International Classes:
G03C1/035; G03C1/26; G03C5/16; (IPC1-7): G03C1/035
Foreign References:
| US4581327A | 1986-04-08 | |||
| EP0154920A2 | 1985-09-18 | |||
| DE1169290B | 1964-04-30 | |||
| US4983509A | 1991-01-08 | |||
| JPS6317443A | 1988-01-25 |
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