Radiation imagery chemistry: process – composition – or product th – Radiation sensitive product – Silver compound sensitizer containing
Patent
1994-12-19
1996-02-27
Baxter, Janet C.
Radiation imagery chemistry: process, composition, or product th
Radiation sensitive product
Silver compound sensitizer containing
430570, 430599, G03C 1035
Patent
active
054947898
ABSTRACT:
An improved spectrally sensitized ultrathin tabular grain emulsion is disclosed in which 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, (e) exhibiting an average thickness of less than 0.07 .mu.m, and (f) having latent image forming chemical sensitization sites on the surfaces of the tabular grains, are spectrally sensitized and improved by employing in forming the surface chemical sensitization sites at least one silver salt epitaxially located on the tabular grains. A photographic element is disclosed comprised of a support, a first silver halide emulsion layer coated on the support and sensitized to produce a photographic record when exposed to specular light within the minus blue visible wavelength region of from 500 to 700 nm, a second silver halide emulsion layer capable of producing a second photographic record coated over the first silver halide emulsion layer to receive specular minus blue light intended for the exposure of the first silver halide emulsion layer, the second silver halide emulsion layer being capable of acting as a transmission medium for the delivery of at least a portion of the minus blue light intended for the exposure of the first silver halide emulsion layer in the form of specular light, wherein the second silver halide emulsion layer is comprised of the improved spectrally sensitized ultrathin tabular grain emulsion of the invention.
REFERENCES:
patent: 4435501 (1984-03-01), Maskasky
patent: 4439520 (1984-03-01), Kofron et al.
patent: 5250403 (1993-10-01), Antoniades et al.
patent: 5372927 (1994-12-01), Delton
Buhr et al Research Disclosure, vol. 253, Item 25330, May 1985.
Black Donald L.
Daubendiek Richard L.
Deaton Joseph C.
Gersey Timothy R.
Lighthouse Joseph G.
Baxter Janet C.
Eastman Kodak Company
Thomas Carol O.
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