Photographic emulsions of enhanced sensitivity and reduced contr

Details Photographic emulsions of enhanced sensitivity and reduced contr Photographic emulsions of enhanced sensitivity and reduced contr

1996-05-28

1997-09-16

Huff, Mark F.

Radiation imagery chemistry: process, composition, or product th

Radiation sensitive product

Silver compound sensitizer containing

G03C 1035

Patent

active

056679548

ABSTRACT:
An emulsion of enhanced photographic sensitivity and reduced contrast is disclosed containing high bromide tabular grains having a non-uniform iodide distribution, including (a) a peripheral zone extending inwardly from edges and corners of the tabular grains and providing (i) a maximum iodide concentration along the edges and (ii) a lower iodide concentration at the corners than elsewhere along the edges, (b) a central zone providing a minimum iodide concentration and accounting for at least 35 percent of total silver forming the tabular grains and, (c) extending from the central zone to the peripheral zone, an intermediate zone (i) containing a higher iodide concentration than the central zone, ranging from greater than 2 to 10 mole percent, based on silver forming the intermediate zone, and (ii) accounting for from 5 to 35 percent of total silver forming the tabular grains.

REFERENCES:
patent: 4433048 (1984-02-01), Solberg et al.
patent: 5314793 (1994-05-01), Chang et al.
patent: 5470698 (1995-11-01), Wen
patent: 5476760 (1995-12-01), Fenton et al.
patent: 5567580 (1996-10-01), Fenton et al.

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