Claims
- 1. A method of spectrally sensitizing a photographic light-sensitive emulsion which comprises adding thereto an aqueous solution of a sulfo-substituted cyanine dye represented by the following general formula (VI') ##STR34## wherein Z.sub.3 and Z.sub.4 each represents --O--, ##STR35## --S-- or --Se--, wherein R.sub.0 represents an alkyl group or a substituted alkyl group; Z.sub.5 and Z.sub.6 each represents an atomic group necessary to form a benzene ring or a naphthalene ring; R.sub.M represents a hydrogen atom, an alkyl group, an aryl group, or a substituted aryl group; R and R.sub.1 each represents an alkyl group or an aryl group, with either R or R.sub.1 representing a sulfo group-containing alkyl group; p.sub.1 represents 1 or 2; q represents 1 or 2; X represents an inorganic acid anion or an organic acid anion; and a Red Shift Compound represented by the following general formula (IV) ##STR36## wherein --A-- is a divalent aromatic residue; Y is .dbd.CH--, .dbd.CB.sub.8 -- or .dbd.N--, wherein B.sub.8 is an alkyl group or a halogen atom; and B.sub.4, B.sub.5, B.sub.6 and B.sub.7 each represents a hydrogen atom, a hydroxy group, an alkoxy group, an alkyl group, an arylalkoxy group, a halogen atom, a heterocyclic nucleus, an alkylthio group, a heterocyclothio group, an arylthio group, an amino group, an arylamino group, a heterocycloamino group, an aryl group or a mercapto group, wherein B.sub.4, B.sub.5, B.sub.6 and B.sub.7 may each be the same as or different from each other and wherein when --A-- does not contain a sulfo group, at least one of B.sub.4, B.sub.5, B.sub.6 and B.sub.7 comprises at least one sulfo group where the molar ratio of the amount of said sulfo-substituted cyanine dye represented by the general formula, (VI') to the amount of said Red Shift Compound represented by the general formula (IV) ranges from about 1:1 to about 1:2.
- 2. The method of claim 1, wherein said Red Shift Compound is selected from the group consisting of ##STR37##
- 3. The method of claim 1, wherein the aqueous solution contains said Red Shift Compound at a concentration of about 0.005% to about 0.2% by weight.
- 4. A photographic light-sensitive material comprising at least one silver halide photographic emulsion layer on a support wherein at least one silver halide photographic emulsion layer is spectrally sensitized in accordance with the method of claim 1.
- 5. A multi-layered color photographic light-sensitive material comprising at least a support, a blue-sensitive silver halide emulsion layer coated on the support, a green-sensitive silver halide emulsion layer and a red-sensitive silver halide emulsion layer, characterized in that at least one of said silver halide emulsion layers is spectrally sensitized in accordance with the method of claim 1.
- 6. The method of claim 1, wherein said Red Shift Compound meets the following criterion: it shifts the maximum absorption wavelength of said sulfo-substituted cyanine dye if said sulfo-substituted cyanine dye is dissolved in a methanol-water mixed solvent, the volume ratio of methanol to water being 1.4, toward the longer wavelength side.
- 7. The method of claim 6, wherein said maximum absorption wavelength is shifted at least 1 m.mu. longer.
- 8. The method of claim 6, wherein said maximum absorption wavelength is shifted at least 2 m.mu. longer.
- 9. The method of claim 1, wherein said sulfo-substituted cyanine dye is present in aqueous solution in an amount of from about 10.sup.-4 to about 10.sup.-1 mol/l.
- 10. The method of claim 1, wherein said Red Shift Compound is water-soluble.
- 11. The method of claim 1, wherein Z.sub.3 and Z.sub.4 are S.
- 12. The method of claim 1, wherein Z.sub.5 and Z.sub.6 represent an atomic group necessary to form a benzene ring.
Priority Claims (3)
Number |
Date |
Country |
Kind |
50-946 |
Dec 1974 |
JPX |
|
2557916 |
Dec 1975 |
DEX |
|
52862/75 |
Dec 1975 |
GBX |
|
CROSS-REFERENCE TO RELATED APPLICATIONS
This application is a continuation of application Ser. No. 765,314, filed Feb. 3, 1977 and now U.S. Pat. No. 4,138,266 issued Feb. 6, 1979, which in term is a continuation-in-part of application Ser. No. 644,004 filed Dec. 24, 1975 and now abandoned.
US Referenced Citations (4)
Number |
Name |
Date |
Kind |
2933390 |
McFall et al. |
Apr 1960 |
|
2937089 |
Jones et al. |
May 1960 |
|
3615641 |
Shiba et al. |
Oct 1971 |
|
3822135 |
Sakai et al. |
Jul 1974 |
|
Continuations (1)
|
Number |
Date |
Country |
Parent |
765314 |
Feb 1977 |
|
Continuation in Parts (1)
|
Number |
Date |
Country |
Parent |
644004 |
Dec 1975 |
|