Process for producing silver halide photographic emulsion

• US 4,683,193 A
• Filed: 03/21/1985
• Issued: 07/28/1987
• Est. Priority Date: 03/21/1984
• Status: Expired due to Term

• Current Assignee: Fuji Photo Film Co Limited (Fujifilm Holdings Corporation)
• Original Assignee: Fuji Photo Film Co Limited (Fujifilm Holdings Corporation)
• Inventors: Ihama, Mikio, Ohnishi, Hiroshi, Tani, Tadaaki
• Primary Examiner(s): Goodrow, John L.
• Assistant Examiner(s): SHAH, MUKUND JETHALAL
• Application Number:
  US06/714,316
• Time in Patent Office: 859 Days
• Field of Search: 430/569, 430/570
• US Class Current: 430/570
• CPC Class Codes: G03C 1/005 Silver halide emulsions; Preparation thereof; Physical treatment thereof; Incorporation of additives therein catalytic amounts of silver halide in dry silver systems or thermographic systems using noble metal compounds G03C1/494

Abstract

A process for producing a spectrally sensitized silver halide photographic emulsion is described, comprising adding a substantially water-insoluble spectral sensitizing dye in an aqueous carrier to an emulsion before completion of the formation of silver halide grains without using an organic solvent.

Claims

1. A process for producing a spectrally sensitized silver halide photographic emulsion comprising adding a substantially water-insoluble organic spectral sensitizing dye in an aqueous medium to an emulsion before completion of the formation of silver halide grains without using an organic solvent, wherein said substantially water-insoluble organic spectral sensitizing dye has a water solubility of 0.01% by weight or less.

2. A process for producing a spectrally sensitized silver halide photographic emulsion as in claim 1, wherein the substantially water-insoluble organic spectral sensitizing dye is used in the form of particles having a mean grain size of 1 μ

m or less.

3. A process for producing a spectrally sensitized silver halide photographic emulsion as in claim 1, wherein the substantially water-insoluble organic spectral sensitizing dye is used in the form of particles having a mean grain size of from 1 to 0.1 μ

m.

4. A process for producing a spectrally sensitized silver halide photographic emulsion as in claim 1, wherein the substantially water-insoluble organic dye is dispersed in water with the aid of dispersing agent, and the resulting dispersion is added to the emulsion.

5. A process for producing a spectrally sensitized silver halide photographic emulsion as in claim 4, wherein the dispersion is dried to a powder form before addition to the emulsion.

6. A process for producing a spectrally sensitized silver halide photographic emulsion as in claim 1, wherein the substantially water-insoluble organic dye and a dispersing agent are homogenized with a binder, and the resulting homogenate is added to the emulsion.

7. A process for producing a spectrally sensitized silver halide photographic emulsion as in claim 1, wherein the substantially water-insoluble organic dye is pulverized in water without the aid of a dispersing agent into fine particles of 1 μ

m or less, and added directly to the emulsion.

8. A process for producing a spectrally sensitized silver halide photographic emulsion as in claim 1, wherein the substantially water-insoluble organic dye is an anionic dye containing at least one sulfo group or sulfoalkyl group.

9. A process for producing a spectrally sensitized silver halide photographic emulsion as in claim 1, wherein said substantially water-insoluble organic spectral sensitizing dye is a cyanine dye or a merocyanine dye.

10. A process for producing a spectrally sensizited silver halide photographic emulsion as in claim 1, wherein said substantially water-insoluble organic spectral sensitizing dye is a cyanine dye represented by the formula (I):

##STR6## wherein Z₁ and Z₂ each represents a heterocyclic mucleus;

L₁ and L₂ each represents a methine group or a substituted methine group;

R₁ and R₂ each represents an alkyl group, a substituted alkyl group or an allyl group;

m₁ represents 1, 2 or 3;

X₁ represents an acid anion group; and

N₁ represents 1 or 2.