Patent ID: 6607876
Filing Date: 2003-08-19
Classification: G03C,Y10S

Abstract:
Film material having at least one emulsion comprising {111} tabular silver halide grains rich in silver bromide, spectrally sensitive to irradiation in the wavelength range between 540 and 555 nm by the presence of a combination of at least one J-aggregating spectrally sensitizing cyanine dye according to the formula (I) whereinZ represents a nitrogen or an oxygen atom and is substituted with Râ€³ if Z is a nitrogen atom, R, Râ€² and Râ€³ each independently represent substituted or unsubstituted alkyl, Râ€²â€³ represents hydrogen, substituted or unsubstituted alkyl or substituted or unsubstituted aryl, T and Tâ€² each independently represent the usual substituents known in the art, (Xâˆ’)p represents an negatively charged atom or group of atoms to compensate for the positive charge(s) present on the dye, and (M+)q represents a positively charged atom or group of atoms to compensate for the negative charge(s) present on the dye, wherein p and q each represent an integer in order to get an electronically neutral compound; and of at least one additional cyanine dye, characterized in that said additional cyanine dye or dyes provide(s) a shift of maximum absorption wavelength of said combination being less than 10 nm versus in the absence thereof, wherein said additional dye or dyes is at least one monomethine cyanine dye, and wherein said monomethine cyanine dye corresponds to the formula (II) wherein each of R1 and R2 independently represents a substituted or unsubstituted C1-C5 alkyl chain, or a substituted or unsubstituted (five- or six-membered) aromatic ring, provided that at least one of R1 and R2 has a solubilizing group or a latent solubilizing group; wherein W and Wâ€² each independently represents a substituted or unsubstituted alkyl, a substituted or unsubstituted aryl or a substituted or unsubstituted heterocyclic group and wherein X is an anion, providing electrical neutrality, and said material moreover comprises at least one azacyanine dye.