US 4,892,809 AGrant
Silver Halide Photographic Materials
Issue Date:1990-01-09
•13 Claims
Abstract
A silver halide color photographic material having at least one silver halide emulsion layer on a base, in which the emulsion layer contains at least one kind of specific magenta coupler of a pyrazoloazole system and the silver halide emulsion is a silver chlorobromide emulsion or silver chloroiodobromide emulsion chemically sensitized in the presence of a nucleic acid or a decomposition product thereof prior to the completion of chemical sensitization by sulfur compounds. This color photographic material is improved in color reproduction and image stability, less liable to fogging that is formed during development, and less dependent on processing conditions.
Metadata
Assignee
- Fuji Photo Film Co., Ltd.
Inventor
- Yasuhito Momoki
Application Information
Application Number:US 3512738
Filing Date:1989-05-11
Priority Date:1985-09-20
Art Unit:156
Classifications
IPC:
G03C 738
Field of Search:
430550;551;600;603;607;614;558;569
Patent Drawings
This patent does not have any drawings.
Description
EXAMPLES
(1) Preparation of silver halide emulsion
An aqueous solution containing potassium bromide and sodium chloride in a molar ratio of 7:3 and an aqueous solution of silver nitrate were added with vigorous agitation to an aqueous solution of gelatin containing sodium chloride at 60.degree. C. by double-jet method. After the completion of physical ripening, the soluble salts were removed by precipitation method. Additional gelatin was added for redispersion. 2.0.times.10.sup.-5 mol of sodium thiosulfate and 400 mg of ribonucleic acid ("RNA-F", a product of Sanyo Kokusaku Pulp Co., Ltd.) were added per mol of silver halide, and chemical sensitization was performed at 55.degree. C. Thus there was obtained emulsion A of silver chlorobromide containing 70 mol % of silver bromide.
Emulsion B was prepared in the same manner as above, except that 180 mg of adenine was added in place of ribonucleic acid at the time of chemical sensitization.
For comparison, emulsion C was prepared in the same manner as described in emulsion A above, except that ribonucleic acid was not added at the time of chemical sensitization.
(2) Preparation of sample of color photographic material
Multilayer color photographic paper was prepared by applying the coating solutions to a polyethylene-laminated (both sides) paper base. The constitution of the layers is shown in Table 1. The coating solutions were prepared as follows:
Coating solution for the first layer:
10 g of yellow coupler (a) and 2.1 g of dye stabilizer were dissolved in 10 ml of ethyl acetate and 1.4 ml of solvent (c). The resulting solution was emulsified and dispersed into 90 ml of 10% gelatin solution containing 10 ml of 1% sodium dodecylbenzenesulfonate solution. On the other hand, 95 g of blue-sensitive emulsion was prepared by adding to a silver chlorobromide emulsion (silver bromide: 85 mol %, and Ag 70 g/kg) 2.25.times.10.sup.-4 mol of blue-sensitive dye shown below per mol of silver chlorobromide. The emulsified dispersion and the emulsion were mixed with each other, and gelatin was added to the mixture to adjust the concentration so that the composition shown in Table 1 was obtained.
The coating solutions for the second to seventh layers shown in Table 1 were prepared in the same manner as above. The gelatin hardener for each layer was sodium salt of 1-oxy-3,5-dichloro-s-triazine.
The following spectral sensitizers were used for the respective emulsions.
Spectral sensitizer for blue-sensitive emulsion layer: ##STR10## Spectral sensitizer for green-sensitive emulsion layer: ##STR11## Spectral sensitizer for red-sensitive emulsion layer: ##STR12##
To the red-sensitive emulsion layer, the following compound was added in the amount of 2.6.times.10.sup.-3 mol per mol of silver halide. ##STR13## Further, to the blue-sensitive emulsion layer, green-sensitive emulsion layer and red-sensitive emulsion layer, 1-(5-methylureidophenyl)-5-mercaptoterazole was added in the amount of 8.5.times.10.sup.-5 mol, 7.7.times.10.sup.-4 mol and 2.5.times.10.sup.-4 mol per mol of silver halide, respectively. To the blue-sensitive emulsion layer and green-sensitive emulsion layer, 4-hydroxy-6-methyl-1,3,3a,7-tetrazaindene was added in the amount of 1.2.times.10.sup.-2 mol and 1.1.times.10.sup.-2 mol per mol of silver halide, respectively.
The following dyes were used for the prevention of irradiation in respective emulsion layers. ##STR14## The following are the structural formulas of the couplers and other compounds used in this Example. ##STR15##
The coating solutions for the first to seventh layers were adjusted to a balanced surface tension and viscosity, and the solutions were applied simultaneously to form a multilayer silver halide photographic material.
Thus, Samples 101 to 109 were prepared in which the third layer alone was changed as shown in Table 2.
(3) Exposure and development of color photographic material
Each sample prepared according to the above-mentioned item (2) was subjected to gradation exposure for sensitometry through a green filter using an enlarging apparatus (Fuji color head 609 (Tradename) made by Fuji Photo Film Co., Ltd.). Development was carried out by the following processing steps (1) and (2).
In order to evaluate the liability to magenta fogging, the processing steps (1) and (2) were carried out with the development time extended from the standard 3.5 minutes to 5.5 minutes.
The value of magenta fogging in this case was recorded as "forced fogging". The results obtained with Samples 101 to 109 are shown in Table 3.
It is noted from Table 3 that the remarkable reduction in magenta fogging was realized only in the case where the emulsion contains the specific magenta coupler of this invention and a nucleic acid or a decomposition product thereof.
The samples 101 to 109 prepared in the above-mentioned procedure (2) which were not exposed were processed in the same manner as the above-mentioned processing step (2). The processed samples were stored under the following three different conditions respectively and the yellowing of the white background was observed.
(1) For 10 days at normal temperature (about 30.degree. C.) in a xenon (200,000 lux) fade meter.
(2) For 7 days at 100.degree. C.
(3) For 20 days at 80.degree. C. and 70% RH
Table 4 shows the amount of increase in yellow density of the white background which occurred in each sample. It is apparent from the results in Table 4 that the magenta coupler of this invention used in combination with a nucleic acid or a decomposition product thereof greatly suppresses the yellowing of the white background compared with the conventional magenta coupler, when the photographic materials are stored under various conditions.
Further samples of color photographic material were prepared in the same manner as described above, except that as a magenta coupler M-32, M-33, M-34, M-36, M-37 or M-39 was used in place of M-35 or M-38. According to the tests, those samples exhibited the same eminent photographic properties as the above.
As many apparently widely different embodiments of this invention may be made without departing from the spirit and scope thereof, it is to be understood that the invention is not limited to the specific embodiments thereof except as defined in the appended claims.
Claims
What is claimed is:
1. A silver halide color photographic material comprising a support and at least one silver halide emulsion layer disposed on said support, wherein said emulsion layer contains at least one type of magenta coupler from a pyrazoloazole system represented by Formula (V) or (VI) below, and said silver halide emulsion is a silver chlorobromide emulsion or a silver chloroiodobromide emulsion which is chemically sensitized in the presence of at least one compound selected from the group consisting of deoxyribonucleic acid, ribonucleic acid, adenine, guanine, uracil, cytosine and thymine prior to the completion of chemical sensitization by sulfur compounds: ##STR18## wherein R.sup.11 and R.sup.12, which may be the same or different from each other, independently represent a hydrogen atom, halogen atom, alkyl group, aryl group, heterocyclic group, cyano group, alkoxyl group, aryloxy group, heterocyclic oxy group, acyloxy group, carbamoyloxy group, silyloxy group, sulfonyloxy group, acylamino group, anilino group, ureido group, imido group, sulfamoylamino group, carbamoylamino group, alkylthio group, arylthio group, heterocyclic thio group, alkoxycarbonylamino group, aryloxycarbonylamino group, sulfonamido group, carbamoyl group, acyl group, sulfamoyl group, sulfonyl group, sulfinyl group, alkoxycarbonyl group, and aryloxycarbonyl group; and X represents a hydrogen atom, halogen atom, carboxyl group, or a coupling split-off group connected through an oxygen atom, nitrogen atom, or sulfur atom; or the magenta coupler may be a dimer or a polymer connected through R.sup.11, R.sup.12 or X.
2. The silver halide color photographic material as described in claim 1, wherein said compound is adenine, guanine or uracil.
3. The silver halide color photographic material as described in claim 1, wherein said compound is selected from the group consisting of ribonucleic acid, adenine, guanine and combinations thereof.
4. The silver halide color photographic material as described in claim 1, wherein said compound is adenine.
5. The silver halide color photographic material as described in claim 1, wherein said compound is included in an amount of 20 mg or more per mol of silver halide.
6. The silver halide color photographic material as described in claim 1, wherein the magenta coupler is selected from the coupler represented by formula, (V).
7. The silver halide color photographic material as described in claim 1, wherein the magenta coupler is selected from the coupler represented by formula (VI).
8. The silver halide color photographic material as described in claim 1, wherein R.sup.11 and R12 are selected from the group consisting of a hydrogen atom, alkyl group, aryl group, acylamino group and alkylthio group.
9. The silver halide color photographic material as described in claim 1, wherein said compound is added to the silver halide emulsion at the time of forming the silver halide particles, at the time of physical ripening or at the time of chemical ripening.
10. The silver halide color photographic material as described in claim 1, wherein the silver chlorobromide or silver chloroiodobromide contains at least 1 mol % of silver chloride.
11. The silver halide color photographic material as described in claim 1, wherein the magenta coupler represented by Formula (V) or Formula (VI) are included in an emulsion layer in an amount of from 1.times.10.sup.-3 mol to 1 mol per mol of silver halide in the same layer.
12. The silver halide color photographic material as described in claim 1, further comprising a silver halide emulsion layer containing a cyan coupler and a silver halide emulsion layer containing a yellow coupler.
13. A silver halide color photographic material comprising a support and at least one silver halide emulsion layer disposed on said support, wherein said emulsion layer contains at least one type of magenta coupler from a pyrazoloazole system represented by Formula (V) or (VI) below, and said silver halide emulsion is a silver chlorobromide emulsion or a silver chloroiodobromide emulsion which is chemically sensitized in the presence of at least one compound selected from the group consisting of deoxyribonucleic acid, ribonucleic acid, decomposition products of deoxyribonucleic acid and decomposition products of ribonucleic acid prior to the completion of chemical sensitization by sulfur compounds: ##STR19## wherein R.sup.11 and R.sup.12, which may be the same or different from each other, independently represent a hydrogen atom, halogen atom, alkyl group, aryl group, heterocyclic group, cyano group, alkoxyl group, aryloxy group, heterocyclic oxy group, acyloxy group, carbamoyloxy group, silyloxy group, sulfonyloxy group, acylamino group, anilino group, ureido group, imido group, sulfamoylamino group, carbamoylamino group, alkylthio group, arylthio group, heterocyclic thio group, alkoxycarbonylamino group, aryloxycarbonylamino group, sulfonamido group, carbamoyl group, acyl group, sulfamoyl group, sulfonyl group, sulfinyl group, alkoxycarbonyl group, and aryloxycarbonyl group; and X represents a hydrogen atom, halogen atom, carboxyl group, or a coupling split-off group connected through an oxygen atom, nitrogen atom, or sulfur atom; or the magenta coupler may be a dimer or a polymer connected through R.sup.11, R.sup.12 or X.