Radiation imagery chemistry: process – composition – or product th – Radiation sensitive product – Silver compound sensitizer containing
Patent
1996-06-12
1997-09-16
Chea, Thorl
Radiation imagery chemistry: process, composition, or product th
Radiation sensitive product
Silver compound sensitizer containing
430639, 430641, G03C 100, G03C 1047
Patent
active
056679556
ABSTRACT:
An improved spectrally sensitized ultrathin tabular grain emulsion is disclosed in which tabular grains (a) having {111} major faces, (b) containing greater than 50 mole percent bromide, based on silver, (c) accounting for greater than 70 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, show an enhanced capability for chemical sensitization by reason of employing an oxidized cationic starch as a peptizer.
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: 4439520 (1984-03-01), Kofron et al.
patent: 4717650 (1988-01-01), Ikeda et al.
patent: 5250403 (1993-10-01), Antoniades et al.
patent: 5284744 (1994-02-01), Maskasky
Mees The Theory of the Photographic Process, Revised Ed., Macmillan, 1951, pp. 48 and 49.
James The Theory of the Photographic Process, 4th Ed., Macmillan, 1977, p. 51.
Research Disclosure, vol. 365, Sep. 1994, Item 36544.
Research Disclosure, vol. 176, Dec. 1978, Item 17643.
Buhr et al. Research Disclosure, vol. 253, Item 25330, May 1985.
Chea Thorl
Eastman Kodak Company
Thomas Carl O.
LandOfFree
High bromide ultrathin tabular emulsions improved by peptizer mo does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with High bromide ultrathin tabular emulsions improved by peptizer mo, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and High bromide ultrathin tabular emulsions improved by peptizer mo will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-217267