Color diffusion transfer element with hydroquinone type compound

Details Color diffusion transfer element with hydroquinone type compound Color diffusion transfer element with hydroquinone type compound

1981-05-26

1985-09-17

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...

430214, 430485, G03C 140, G03C 554

Patent

active

045420866

ABSTRACT:
A color diffusion transfer photographic element comprising (a) a light sensitive component containing at least one light sensitive silver halide emulsion layer associated with a dye releasing redox compound, (b) a dye image receiving component and (c) an alkaline processing composition component, wherein the improvement comprises at least one of said components (a), (b) and (c) containing a diffusible hydroquinone type compound having the half wave potential of polarography in the range of from -300 mV to -380 mV measured using a saturated calomel electrode as a reference electrode in a buffer solution having a pH of 13.0.degree. at 25.degree. C. The diffusible hydroquinone type compound has excellent gradation control properties and is particularly suitable for controlling gradation of the toe part in a photographic characteristic curve of a color diffusion transfer photograph. A typical example of a diffusible hydroquinone compound of the invention is: ##STR1##

REFERENCES:
patent: 4201578 (1980-05-01), Abbott
patent: 4429031 (1984-01-01), Tsubota et al.
"Photographic Processes and Products", Research Disclosure, No. 15162, 11/1976, pp. 76-89.

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