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US 4,066,456 AGranted
Incorporated carboxy substituted p-phenylenediamine color developer
AssigneeGAF Corporation
InventorsBurton H. Waxman, Michael C. Mourning, Theodore Panasik
Life of this patent
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Abstract
A derivative of paraphenylenediamine, for use as a color developer, having a primary amino group available for oxidative coupling, and a carboxy group bound to the benzene ring to provide the compound with the required stability to enable the compound to be incorporated into a photographic film, the compound being non-diffusible during development of the photographic film in an alkaline processing solution.
Claims19
A photographic element, comprising a supported, light-sensitive silver halide emulsion having incorporated therein, or in a layer adjacent thereto, the compound of the general formula:
- ##STR25## where R.sub.1 is hydrogen, halogen, an aliphatic group or an aromatic group;
- R.sub.2 is hydrogen;
- and
- R.sub.3 and R.sub.4 are independently hydrogen, an aliphatic group or an aromatic group;
- or
- R.sub.2 and R.sub.3 together represent the necessary ring members to form a heterocyclic ring with the nitrogen atom to which R.sub.3 is attached being the sole heteroatom or there being a second heteroatom selected from nitrogen, oxygen and sulfur;
- or
- R.sub.3 and R.sub.4 together represent the necessary ring members to form a heterocyclic ring with the nitrogen atom to which they are attached being the sole heteroatom or there being a second heteroatom selected from nitogren, oxygen and sulfur;
- provided that at least one of R.sub.1, R.sub.2, R.sub.3 and R.sub.4 by itself, or the net effect of R.sub.1, R.sub.2, R.sub.3 and R.sub.4 is of such molecular size and essentially non-diffusible during development in an alkaline processing composition as a developer, wherein said developer is dissolved or dispersed in a high boiling, photographically inert oil.
6 more elements
Dependencies are inferred from the claim text.