Ultrathin tabular grain emulsions with reduced reciprocity failu

Details Ultrathin tabular grain emulsions with reduced reciprocity failu Ultrathin tabular grain emulsions with reduced reciprocity failu

1995-05-15

1997-03-25

Huff, Mark F.

Radiation imagery chemistry: process, composition, or product th

Radiation sensitive product

Silver compound sensitizer containing

430570, 430604, 430605, G03C 109, G03C 1035

Patent

active

056143583

ABSTRACT:
A chemically and spectrally sensitized ultrathin tabular grain emulsion is disclosed including tabular grains (a) having {111} major faces, (b) containing greater than 70 mole percent bromide, based on silver, (c) accounting for greater than 90 percent of total grain projected area, (d) exhibiting an average equivalent circular diameter of at least 0.7 .mu.m, and (e) exhibiting an average thickness of less than 0.07 .mu.m.
It has been observed that increased speed and contrast as well as improvements in speed-granularity relationships can be realized when the surface chemical sensitization sites include epitaxially deposited silver halide protrusions forming epitaxial junctions with the tabular grains, the protrusions (a) being located on up to 50 percent of the surface area of the tabular grains, (b) having a higher overall solubility than at least that portion of the tabular grains forming epitaxial junctions with the protrusions, and (c) forming a face centered cubic crystal lattice.
In further improving photographic performance by incorporating a photographically useful dopants, it has been observed that iridium placed in the ultrathin tabular grains and a shallow electron trapping site providing dopant placed in the silver halide protrusions can together increase photographic speed and reduce high intensity reciprocity failure.

REFERENCES:
patent: 4435501 (1984-03-01), Maskasky
patent: 4439520 (1984-03-01), Kofron et al.
patent: 4814264 (1989-03-01), Kishida et al.
patent: 5051344 (1991-09-01), Kuno
patent: 5166044 (1992-11-01), Asami
patent: 5250403 (1993-10-01), Antoniades et al.
patent: 5494789 (1996-02-01), Daubendiek et al.
patent: 5503970 (1996-04-01), Olm et al.
patent: 5503971 (1996-04-01), Daubendiek et al.
patent: 5518872 (1996-05-01), King et al.
patent: 5536632 (1996-07-01), Wen et al.
Buhr et al Research Disclosure vol. 253, Item 25330 May 1985.
Research Disclosure vol. 308, Dec. 1989, Item 308119, Section I, Paragraph D.

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