C - Chemistry – Metallurgy – 07 – D
Patent
C - Chemistry, Metallurgy
07
D
96/118, 260/300,
C07D 249/08 (2006.01) C07D 235/18 (2006.01) C07D 271/10 (2006.01) G03C 7/00 (2006.01) G03C 7/36 (2006.01)
Patent
CA 1143377
Abstract of the Disclosure Light-sensitive recording material for colour photography, which contains, in at least one silver halide emulsion layer, at least one yellow coupler of the formula Image in which R1 is alkyl, R2 is alkyl or aryl and R3 is sub- stituted or unsubstituted alkyl, alkoxy or alkylmercapto, cycloalkylmercapto, aryl, aryloxy or arylmercapto, the of the carbon atoms in the substituents R1, R2 and R3 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 R4s are each halogen, alkyl, alkoxy, halogenoalkyl, alkylsulfonyl or aryloxy, X is a radical detachable during the coupling reaction, A is a 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.
335105
Ag Ciba-Geigy
Gowling Lafleur Henderson Llp
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