Radiation imagery chemistry: process – composition – or product th – Radiation sensitive product – Silver compound sensitizer containing
Patent
1996-01-26
1997-03-18
Huff, Mark F.
Radiation imagery chemistry: process, composition, or product th
Radiation sensitive product
Silver compound sensitizer containing
430570, 430581, G03K 1035
Patent
active
056121750
ABSTRACT:
A radiation-sensitive spectrally sensitized tabular grain emulsion is disclosed which exhibits improved speed and contrast. The tabular grains have {111} major faces, contain greater than 70 mole percent bromide and up to 10 mole percent iodide, based on silver, account for greater than 90 percent of total grain projected area, and have an average equivalent circular diameter of at least 3.5 .mu.m. The tabular grains have latent image forming chemical sensitization sites on their surfaces including epitaxially deposited silver halide protrusions of a face centered cubic rock salt crystal lattice structure forming epitaxial junctions with the tabular grains. The protrusions are restricted to those portions of the tabular grains located nearest peripheral edges of and accounting for less than 10 percent of the {111} major faces of the tabular grains, accounting for less than 5 percent of total silver forming the tabular grains and protrusions, containing a silver chloride concentration at least 10 mole percent higher than that of the tabular grains, and contain at least 1 mole percent iodide, based on silver in the protrusions.
REFERENCES:
patent: 4435501 (1984-03-01), Maskasky
patent: 4439520 (1984-03-01), Kofron et al.
patent: 5250403 (1993-10-01), Antoniades et al.
patent: 5494789 (1996-02-01), Daubendiek et al.
Antoniades Michael G.
Deaton Joseph C.
DuMont David A.
Eshelman Lyn M.
Johnston Sharon G.
Eastman Kodak Company
Huff Mark F.
Thomas Carl O.
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