Process for the production of colored photographic images by the

Details Process for the production of colored photographic images by the Process for the production of colored photographic images by the

1979-09-20

1981-05-05

Brown, J. Travis

Radiation imagery chemistry: process, composition, or product th

Color imaging process

Using identified radiation sensitive composition in the...

430431, 430461, 430462, 430559, G03C 700

Patent

active

042660114

ABSTRACT:
A process for the production of colored photographic images by the silver dye-bleach process by image-wise exposure and subsequent processing by developing the silver image, dye-bleaching and silver bleaching, it being possible, optionally, for the last two steps to be combined, silver fixing and washing, in which process dye-bleaching and/or silver bleaching is carried out in the presence of at least one bleach catalyst of the formula ##STR1## In the formula, A and B are in each case the non-metallic atoms necessary to complete a benzene or pyridine ring, R.sub.1 and R.sub.3 are each hydrogen, hydroxyl, halogen, alkyl, carboxyl, carbalkoxy, carbalkoxyalkoxy, --CH.sub.2 OH, --O(CH.sub.2).sub.n OH, --O(CH.sub.2).sub.2 O(CH.sub.2).sub.2 OH, --CH.sub.2 Cl, --CH.sub.2 Br, --NR.sub.5 R.sub.6, --CH.sub.2 NR.sub.5 R.sub.6, --O(CH.sub.2).sub.n NR.sub.5 R.sub.6, --CH.sub.2 SO.sub.3 M, --O(CH.sub.2).sub.n SO.sub.3 M or --SO.sub.3 M, R.sub.2 and R.sub.4 are each hydrogen, hydroxyl, alkyl or alkoxy and R.sub.5 and R.sub.6 are each hydrogen or alkyl, M is hydrogen, an alkali metal, ammonium or alkylammonium and n is an integer from 2 to 4.

REFERENCES:
patent: 2270118 (1942-01-01), Gaspar
patent: 2627461 (1953-02-01), Friedman
patent: 3443947 (1969-05-01), Mory et al.
patent: 3754918 (1973-08-01), Hunig et al.
patent: 4145217 (1979-03-01), Jan et al.

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