Radiation imagery chemistry: process – composition – or product th – Transfer procedure between image and image layer – image... – Diffusion transfer process – element – or identified image...
Patent
1978-09-20
1983-07-05
Schilling, Richard L.
Radiation imagery chemistry: process, composition, or product th
Transfer procedure between image and image layer, image...
Diffusion transfer process, element, or identified image...
430212, 430236, 430242, 430390, 430391, 430505, 430559, G03C 140, G03C 110, G03C 554
Patent
active
043918964
ABSTRACT:
Curve shape control, especially for lower scale contrast, of a photographic element is achieved by employing with the silver halide emulsion layer two nondiffusible redox dye-releasing compounds of different relative reactivities, the reactivity of the compound which is more reactive being at least 1.5 times the reactivity of the compound which is less reactive. Preferred compounds are ballasted sulfonamido compounds, each of which has a color-providing moiety attached thereto through a sulfonamido group which is alkali-cleavable upon oxidation. Preferred more reactive sulfonamido compounds have a N,N-disubstituted carbamoyl ballast group. The color-providing moieties can be (1) transferred imagewise to an image-receiving layer to provide a useful image, or (2) can be merely diffused out of the element to provide a retained image therein which can be treated to form a color transparency or a motion picture film.
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"A Fundamentally . . . Photography", Hanson, Photo Ice and Energy vol. 20, No. 4, 8/1976, pp. 155-160.
Maier Thomas O.
Richards Jack L.
Cole Harold E.
Eastman Kodak Company
Schilling Richard L.
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