The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Feb. 03, 1981
Filed:
May. 02, 1979
Remon Hagen, Chemin Foret, CH;
Mario Fryberg, Praroman-le-Mouret, CH;
Ciba-Geigy AG, Basel, CH;
Abstract
Light-sensitive recording material for color photography is provided which contains, in at least one silver halide emulsion layer, a yellow coupler of the formula ##STR1## in which R and R' are alkyl, cycloalkyl or aryl and X.sub.1 and X.sub.2 are radicals which are detachable during the coupling reaction, Y is halogen, alkyl, alkoxy, alkylmercapto, --CN, --COOH, carbalkoxy, --NH.sub.2, --NHR.sub.1, --NR.sub.1 R.sub.2 or --NHCOR.sub.1, in which R.sub.1 and R.sub.2 are alkyl or phenyl, Z is alkyl having 5 to 40 carbon atoms, alkoxy having 5 to 40 carbon atoms, cycloalkoxy having 5 to 12 carbon atoms or aralkyl; alkoxyalkyl, alkoxycycloalkyl, cycloalkoxyalkyl, optionally substituted phenoxyalkyl, alkylamino- and dialkylamino-alkyl, optionally substituted arylamino- and diarylamino-alkyl, alkylmercaptoalkyl or optionally substituted arylmercaptoalkyl, in which radicals the sum of the carbon atoms in each case is 6 to 40; or --COOR.sub.3, --COR.sub.3, --NR.sub.3 R.sub.4, --CONR.sub.3 R.sub.4, --NR.sub.4 COR.sub.3, --SO.sub.2 R.sub.3, --SO.sub.2 NR.sub.3 R.sub.4 or --NR.sub.4 SO.sub.2 R.sub.3, R.sub.3 is optionally substituted alkyl having 1 to 40 carbon atoms, optionally substituted cycloalkyl having 5 to 12 carbon atoms or optionally substituted phenyl and R.sub.4 is hydrogen or alkyl having 1 to 12 carbon atoms. The couplers used according to the invention have a high coupling reactivity towards the oxidation product of the aromatic primary amine (developer), so that the developing of the silver halide emulsion proceeds rapidly. Furthermore, an adequate color density is achieved, although the molar amont of coupler employed can be markedly reduced compared with that of known couplers.