Radiation imagery chemistry: process – composition – or product th – Transfer procedure between image and image layer – image... – Diffusion transfer process – element – or identified image...
Patent
1983-09-16
1984-08-14
Brown, J. Travis
Radiation imagery chemistry: process, composition, or product th
Transfer procedure between image and image layer, image...
Diffusion transfer process, element, or identified image...
430512, 430523, 430551, 430 17, G03C 554, G03C 726
Patent
active
044657579
ABSTRACT:
Compounds of the formula I ##STR1## in which A, R.sup.1, R.sup.2, R.sup.3, R.sup.4, R.sup.5 and R.sup.6 are as defined in claim 1, are effective optical stabilizers for photographic dyes and their precursors. They are added to the colorphotographic recording materials as the latter are being prepared, and, as a result, the developed images have a longer optical stability.
REFERENCES:
patent: 2596926 (1952-05-01), Gunther et al.
patent: 3183219 (1965-05-01), Schuler
patent: 4197236 (1980-04-01), Rosenberger et al.
patent: 4268593 (1981-05-01), Leppard et al.
Leppard David G.
Rody Jean
Brown J. Travis
Ciba-Geigy A.G.
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