Tabular grain emulsions containing laminar halide strata

Details Tabular grain emulsions containing laminar halide strata Tabular grain emulsions containing laminar halide strata

1991-03-11

1992-07-21

Bowers, Jr., Charles L.

Radiation imagery chemistry: process, composition, or product th

Radiation sensitive product

Silver compound sensitizer containing

430569, 430604, 430605, G03C 1035, G03C 109

Patent

active

051322030

ABSTRACT:
Photographic emulsions are disclosed comprised of radiation sensitive silver iodobromide grains, at least 50 percent of the total projected area of said silver iodobromide grains being accounted for by tabular grains exhibiting a mean tabularity of greater than 5, at least 10 percent of which are comprised of two opposed parallel major crystal faces, a host stratum having an iodide content of at least 4 mole percent, and laminar strata containing less than 2 mole percent iodide interposed between said host stratum and said opposed major crystal faces.
The emulsions are characterized in that each of the laminar strata is comprised of a surface layer forming one of the major surfaces and having a thickness in the range of from 20 to 350 .ANG. and a subsurface layer located immediately beneath and in contact with the surface layer containing a hexacoordination complex of a Group VIII period 4 or 5 metal and at least three cyanide ligands.

REFERENCES:
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patent: 4835095 (1989-05-01), Ohashi et al.
patent: 4937180 (1990-06-01), Marchetti et al.
patent: 4945037 (1990-07-01), Saitou et al.
Research Disclosure, vol. 308, Dec. 1989, Item 308119, Section I.D.

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