Radiation imagery chemistry: process – composition – or product th – Imaged product – Nonsilver image
Patent
1979-08-28
1981-05-19
Brown, J. Travis
Radiation imagery chemistry: process, composition, or product th
Imaged product
Nonsilver image
430381, 430388, 430389, 430548, 430556, 430557, 430558, G03C 700
Patent
active
042685915
ABSTRACT:
Light-sensitive recording material for color photography, which contains, in at least one silver halide emulsion layer, at least one yellow coupler of the formula ##STR1## in which R.sub.1 is alkyl, R.sub.2 is alkyl or aryl and R.sub.3 is substituted or unsubstituted alkyl, alkoxy or alkylmercapto, cycloalkylmercapto, aryl, aryloxy or arylmercapto, the sum of the carbon atoms in the substituents R.sub.1, R.sub.2 and R.sub.3 being 3 to 30 and at least two of these substituents being able to form a cyclic radical together with the carbon atom to which they are bonded, the R.sub.4 s are each halogen, alkyl, alkoxy, halogenoalkyl, alkylsulfonyl or aryloxy, X is a radical detachable during the coupling reaction, A is a 5-membered, heterocyclic, unsaturated ring system which contains 2 or 3 hetero-atoms, at least one of which is a nitrogen atom, and can be fused with a benezene ring and which is substituted by at least one ballast group and r is 1 or 2.
The yellow couplers show high reactivity (high maximum density), which makes possible accelerated processing of the photographic materials, and minimal fogging. The couplers also have good fastness to light.
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Brown J. Travis
Ciba-Geigy AG
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