Color photographic diffusion transfer process

Details Color photographic diffusion transfer process Color photographic diffusion transfer process

1975-09-17

1977-03-08

Klein, David

Gas separation: apparatus

Magnetic separating means

And electric field separation apparatus

96 29D, 96 66HD, 96 77, G03C 700, G03C 554, G03C 140, G03C 530

Patent

active

RE0291480

ABSTRACT:
A color photographic diffusion transfer process in which a color photographic material having at least one silver halide emulsion layer and a layer adjacent to said silver halide emulsion layer, said layer containing a dye developer, is image-wise exposed, brought into superposed position with an image-receiving element, and then treated with an alkaline processing solution to immobilize the dye developer at the exposed portions of the silver halide emulsion layer and diffusion-transfer the dye developer at the nonexposed portions of the silver halide emulsion layer to the image-receiving element, with the alkali processing being conducted in the presence of 6,6',7,7' -tetrahydroxy-4,4,4',4'-tetramethyl-bis-2,2'-spirochroman. [spirocumarone]

REFERENCES:
patent: 2983606 (1961-05-01), Rogers
patent: 3577236 (1971-05-01), Fix
patent: 3617277 (1971-11-01), Stewart
patent: 3764337 (1973-10-01), Arai et al.
Fisher et al., "The condensation of Polyhydric Phenols and Acetone" Journal of the Am. Chem. Soc. vol. 58, 1936 pp. 820-822.
Baker et al., "Condensation Products of Phenals and Ketones, Part III" J. of the Chemical Soc., London, 1939, pp. 195-202.

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