Color photographic recording material containing non-diffusing electron donor compounds
AssigneeAgfa-Gevaert
InventorsHeinrich Odenwalder, Hans Vetter, Wilhelmus Janssens, Jan Jaeken
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Abstract
Electron donor compounds of the formula I are effective to reduce non-diffusing reducible color providing compounds which when reduced release under the photographic development conditions a diffusible dye. R.sup.1 (--L.sup.1 .dbd.L.sup.2).sub.n --NH--SO.sub.2 --X (I) in which L.sup.1, L.sup.2 represent methine groups which may be part of a carbocyclic or heterocyclic ring R.sup.1 represents --OR.sup.2, --SR.sup.2 or --NHR.sup.3 R.sup.2 represents H or a hydrolysable group R.sup.3 represents H, alkyl, aryl, acyl including a group that together with L.sup.1 completes a ring n=1 or 2 X represents a non-colored organic group.
Claims3
In a color photographic recording material comprising at least one light-sensitive silver halide emulsion layer unit and, associated with this unit, a combination of a non-diffusing, reducible color providing compound which, in the reduced state, is capable of releasing a diffusible dye under alkaline development conditions, and an electron donor compound (ED compound) which is capable of reducing the non-diffusing, reducible color providing compound under the alkaline development conditions, the improvement according to which the material contains, as ED compound, a compound corresponding to the following general formula:
- R.sup.1 (--L.sup.1 .dbd.L.sup.2).sub.n --NH--SO.sub.2 --X
- in which
- L.sup.1, L.sup.2 each represent a methine group ##STR30## which may be a member of an at least partially unsaturated carbocyclic or heterocyclic ring system,
- R.sup.1 represents --OR.sup.2, --SR.sup.2 or --NHR.sup.3,
- R.sup.2 represents hydrogen or a group which is capable of being hydrolysed under the conditions of photographic development,
- R.sup.3 represents hydrogen, alkyl, aryl, acyl or a group which together with the nitrogen atom defined in R.sup.1 and with L.sup.1, optionally with the inclusion of L.sup.2, completes a ring system having at least one 5-, 6- or 7-membered heterocyclic ring,
- n represents 1 or 2, and
- X represents any colorless organic group,
- at least R.sup.1, L.sup.1, L.sup.2 or a ring completed by the said groups (R.sup.1, L.sup.1, L.sup.2) or X contains a group which confers diffusion resistance.
In a color photographic recording material comprising at least one light-sensitive silver halide emulsion layer unit and, associated with this unit, a combination of a non-diffusing, reducible color providing compound which, in the reduced state, is capable of releasing a diffusible dye under alkaline development conditions, and an electron donor compound (ED compound) which is capable of reducing the non-diffusing, reducible color providing compound under the alkaline development conditions, the improvement according to which the material contains, as ED compound, a compound corresponding to the following general formula:
- ##STR32## in which X represents any colorless organic group,
- R.sup.6 represents hydrogen, hydroxyl, alkyl, aryl, carbamoyl or sulfonylamino (--NH--SO.sub.2 R, in which R represents alkyl, aryl or aralkyl), and
- R.sup.7 represents hydrogen or alkyl, aryl, aralkyl, halogen, NO.sub.2, CN, COOH, COOR, carbamoyl, SO.sub.3 H, sulfamoyl, acylamido, OH, OR or acyloxy, in which R represents alkyl, aryl or aralkyl, at least one of the groups R.sup.6, R.sup.7 and X containing a group which confers diffusion resistance.
Dependencies are inferred from the claim text.