Radiation imagery chemistry: process – composition – or product th – Radiation sensitive product – Silver compound sensitizer containing
Patent
1995-05-15
1996-07-16
Wright, Lee C.
Radiation imagery chemistry: process, composition, or product th
Radiation sensitive product
Silver compound sensitizer containing
430604, 430605, 430570, 430603, G03C 1035, G03C 109
Patent
active
055366325
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.
Improved sensitivity is observed when the surface chemical sensitization sites include silver halide protrusions of a face centered cubic crystal lattice structure forming epitaxial junctions with the tabular grains and having a higher overall solubility than at least that portion of the tabular grains forming epitaxial junctions with the protrusions and a sensitivity enhancing combination of dopants are contained in the silver halide grains including a first sensitivity enhancing dopant capable of providing shallow electron trapping sites and a second sensitivity enhancing selenium dopant. To further enhance sensitivity, one of the sensitivity enhancing dopants is restricted to the tabular grains while the other is restricted to the silver halide epitaxy.
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patent: 5166048 (1992-11-01), Wu
patent: 5250403 (1993-10-01), Antoniades et al.
patent: 5275930 (1994-01-01), Maskasky 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.
Research Disclosure vol. 367, Nov. 1994, Item 36736.
Black Donald L.
Daubendiek Richard L.
Deaton Joseph C.
Gersey Timothy R.
Lighthouse Joseph G.
Eastman Kodak Company
Thomas Carl O.
Wright Lee C.
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