Silver halide emulsion containing benzimidazole cyanine dyes

Abstract

Abstract CYANINE DYES OF THE GENERAL FORMULA: 1-R3,2-((1-R,3-R2,5-(CF3-),6-R1-2,3-DIHYDROBENIMIDAZOL- 2-YLIDENE)=CH-CH=CH-),3-R4,6,7-DI(R5-) BENZIMIDAZOLIUM X(-) WHEREIN R1 REPRESENTS A HALOGEN ATOM OR A LOWER ALKYL OR AMINE GROUP, R AND R3 ARE THE SAME OR DIFFERENT AND REPRESENT LOWER ALKYL GROUPS; R2 AND R4 ARE THE SAME OR DIFFERENT AND REPRESENT ALKYL, HYDROXYALKYL, ARALKYL, CARBOXY-SUBSTITUTED ARALKLY, CARBOXY-SUBSTITUTED ALKYL, A GROUP -(CH2)NSO3H WHEREIN N IS AN INTEGER FROM 1 TO 6, AN ACYLSULPHONAMIDE ALKYL GROUP OF THE FORMULA -(CH2)NSO2NHCOR8 WHERE N IS AN INTEGER FROM 1 TO 6 AND R8 IS AN ALKYL GROUP, OR AN ALKYL OR ARALKYL SULPHONAMIDO ALKYL GROUP OF THE FORMULA -(CH2)NSO2NHR9 WHERE N IS AN INTEGER FROM 1 TO 6 AND R9 IS AN ALKYL OR ARALKYL GROUP, R5 REPRESENTS A HYDROGEN OR A HALOGEN ATOM OR AN ALKYL OR AMINO GROUP, R6 REPRESENTS A HYDROGEN OR HALOGEN ATOM OR A TRIFLOROMETHYL, CYANO OR ALKOXYCARBONYL GROUP, EXCEPT THAT WHEN R1 AND R5 EACH REPRESENT A CHLORINE ATOM AND R6 REPRESENTS A TRIFLUOROMETHYL GROUP R2 AND R4 DO NOT REPRESENT THE SAME ALKYL GROUP. A PROCESS FOR PRODUCTION OF THE DYES AND A PHOTOGRAPHIC GELATINO SILVER HALIDE EMULSION CONTAINING THEM ARE ALSO DISCLOSED.

Inventors

• 👤 Konrad Jerzy Bannert
• 👤 Douglas James Fry

Bibliographic Details