PHOTOGRAPHIC EMULSIONS

摘要

1328239 Spectrally sensitized photographic silver halide emulsions EASTMAN KODAK CO 11 Dec 1970 [12 Dec 1969] 58875/70 Heading G2C A photographic light-sensitive silver halide emulsion is spectrally sensitized with (1) a benzimidazolocarbocyanine dye and (2) a benzimidazolothiacarbocyanine dye. Dye (1) preferably has the Formula:- and dye (2) preferably has the Formula:- wherein R1, R2, R3 and R4 are each alkyl, substituted alkyl (e.g. aralkyl) or cycloalkyl; R5, R6 and R7 are each alkyl having 1-4 carbons; R8, R9, R10, R11, R12, R13, R14 and R15 are each H or halogen; each R19 is H, halogen, alkyl, cycloalkyl, alkoxy or aryl; R16, R17 and R18 are each H, halogen cyano, alkyl, cycloalkyl, alkoxy, alkylaminocarbonyl, trifluoralkyl, trifluoroalkylsulphonyl or an acyl radical of a monobasic fatty acid; L1, L2 and L3 are each a methine group which may be substituted; X1 and X2 are each an amon; and m, n, p and k are each 1 or 2; or, when R1, R2, R3 or R4 is sulphoalkyl or carboxyalkyl and X1 or X2 is a hydroxyl ion, the internal anhydride of such dye or dyes.