JPH0743504B2 - Silver halide color photographic light-sensitive material - Google Patents

Description

TECHNICAL FIELD The present invention relates to a silver halide color photographic light-sensitive material, and more specifically, a dye image formed using silver halide having a relatively small grain size. The present invention relates to a silver halide color photographic light-sensitive material having excellent sharpness.

(Prior Art) Generally, a silver halide color photographic light-sensitive material comprises a support such as triacetyl cellulose, polyethylene terephthalate, or polyethylene laminated on both sides having a dry film thickness of several microns and different color sensitivities. It consists of a uniformly coated photosensitive silver halide emulsion layer. In this light-sensitive silver halide emulsion layer, a large number of silver halide grains having a grain size approximately corresponding to the wavelength of visible light and various crystal habits have a smaller refractive index than that of silver halide. It is present in a state of being dispersed in a hydrophilic colloid such as gelatin having a. It is known that when visible light is applied to such a photosensitive silver halide emulsion layer in a direction perpendicular to the surface of the layer, the light rays are scattered by silver halide grains in the layer. This is said to be a phenomenon that occurs because the particle size is about the wavelength of visible light and the refractive indexes of the particles and the binder are different, as described above. The degree of this scattering varies depending on the number of grains per unit volume in the photosensitive silver halide emulsion layer, the grain size, the grain size distribution, the difference in refractive index between the silver halide grains and the binder, and the like. Thus, visible incident light on the light-sensitive silver halide emulsion layer is formed as a result of being scattered in the light-sensitive silver halide emulsion layer even if it is incident perpendicularly to the silver halide emulsion layer. So-called blurring occurs in the image, and the sharpness of the image decreases.

In order to reduce the decrease in image sharpness due to such light scattering, various methods have been conventionally proposed.

For example, the film thickness of the silver halide emulsion layer can be adjusted by decreasing the ratio of silver halide grains to gelatin in the photosensitive silver halide emulsion layer or decreasing the binder of the photosensitive silver halide emulsion. A method of making the light as thin as possible so that scattered light in the layer is diffused in a direction parallel to the surface of the silver halide emulsion layer as much as possible has been used as an effective sharpness improving method.

However, such a method has serious drawbacks. That is, when the proportion of silver halide grains is reduced, the number of development starting points is reduced, so that the graininess is deteriorated. Further, the method of reducing the binder of the silver halide emulsion deteriorates the pressure property. That is, there is a drawback that the film is easily scratched when it is bent or rubbed.

(Problems to be Solved by the Invention) An object of the present invention is to provide a silver halide color photographic light-sensitive material in which the sharpness of a dye image formed is improved.

(Means for Solving the Problems) As a result of earnest research, the present inventors have found that the above object can be achieved by a silver halide color photographic light-sensitive material having the following constitution. That is, an object of the present invention is to provide a silver halide color photographic light-sensitive material in which at least one red-sensitive emulsion layer and green-sensitive emulsion layer and three blue-sensitive emulsion layers having different sensitivities are provided on a support, The three blue-sensitive emulsion layers are provided as the light-sensitive emulsion layers farthest from the support, and the highest-sensitivity blue-sensitive emulsion layer comprises a monodisperse silver halide emulsion having an average grain volume of 0.055 μ ³ or less. And a silver halide color photographic light-sensitive material.

The average grain volume of the emulsion of the present invention is obtained by projecting the emulsion grains by an electron microscope, which is generally used, to determine the length of the side in the case of cubic grains, and in the case of octahedron or more, it is determined in terms of spheres, and tabular. In the case of particle shape, it is easily calculated by obtaining the projected area and the distance between two parallel planes.

The monodisperse silver halide emulsion in the present invention means a value S / (= coefficient of variation) obtained by dividing the standard deviation S defined by the formula (1) by the average grain size defined by the formula (2) is 0.15 or less. What is.

The average grain size referred to here is the diameter of spherical silver halide grains, and the average of the diameters of cubes and grains having a shape other than spherical when the projected image is converted to a circular image of the same area. The value of which is its individual particle size r _i and its number is
When it is n _i, it is defined by the following equation (2).

The monodisperse silver halide emulsion in the present invention has S / of 0.15 or less as described above, and more preferably S /.
Is 0.10 or less, more preferably S / is 0.
08 or less.

A method for producing such a monodisperse silver halide emulsion is described in U.S. Pat.Nos. 3,574,628, 3,655,394 and U.S. Pat.
No. 413,748. In addition, JP-A-48-8600,
51-39027, 51-83097, 53-137133, 54-4852
Monodisperse emulsions such as those described in No. 1, 54-99419, No. 58-37635 and No. 58-49938 can also be preferably used in the present invention.

Any silver halide of silver bromide, silver iodobromide, silver iodochlorobromide, silver chlorobromide and silver chloride may be used in the emulsion layer of the photographic material of the present invention. Preferred silver halide is about 30 mol%
Silver iodobromide or silver iodochlorobromide containing the following silver iodide. Particularly preferred is silver iodobromide containing from about 0.1 mol% to about 15 mol% silver iodide.

The silver halide grains in the photographic emulsion may be so-called Regular grains having regular crystal bodies such as cubes, octahedra and tetradecahedrons, and those having irregular crystal shapes such as spheres, It may have a crystal defect such as a twin plane or a composite form thereof.

The silver halide photographic emulsion which can be used in the present invention can be produced by a known method, for example, Research Disclosure (RD), No. 17643 (December 1978), pp. 22-23, "I. Emulsion production ( Emulsion preparation and types) ”and the same
No. 18716 (November, 1979), p.648 can be followed.

The photographic emulsion used in the present invention is described in "Physics and Chemistry of Photography" by Graphide, published by Paul Montel (P.Glafkides, Chim.
ie et Physique Photographique Paul Montel, 1967),
Duffin, "Photoemulsion Chemistry", published by Forcal Press, Inc. (GFDuffin, Photographic Emulsion Chemistry (Foca
Press, 1966), "Manufacturing and coating of photographic emulsions" by Zelikman et al., published by Forcal Press (VLZelikman et al, Mak
ing and Coating Photographic Emulision, Focal Pres
s, 1964) and the like. That is, any of an acidic method, a neutral method, an ammonia method and the like may be used, and a method of reacting a soluble silver salt and a soluble halogen salt may be a one-sided mixing method, a simultaneous mixing method or a combination thereof. Good. A method of forming grains in the presence of excess silver ions (so-called reverse mixing method) can also be used. As one form of the simultaneous mixing method, a method of keeping pAg in a liquid phase where silver halide is formed constant, that is, a so-called controlled double jet method can be used. According to this method, a silver halide emulsion having a regular crystal form and a substantially uniform grain size can be obtained.

Two or more kinds of silver halide emulsions formed separately may be mixed and used.

The silver halide emulsion composed of the above-mentioned regular grains can be obtained by controlling pAg and pH during grain formation. For details, see, for example, Photographic Science and Engineering.
eering) Vol. 6, pp. 159-165 (1962); Journal of Photo.
graphic Science, 12: 242-251 (1964), U.S. Pat. No. 3,655,394 and British Patent 1,413,748.

Further, tabular grains having an aspect ratio of about 5 or more can be used in the present invention. Tabular grains are described by Gatov, Gutoff, Photographic Science and Engineering,
Volume 14, Pages 248-257 (1970); U.S. Pat. No. 4,434,226.
No. 4,414,310, No. 4,433,048, No. 4,439,520, and British Patent No. 2,112,157, and the like. When tabular grains are used,
It is described in detail in US Pat. No. 4,434,226 cited above that the sensitizing dye has advantages such as improvement of color sensitization efficiency, improvement of graininess and increase of sharpness.

The crystal structure may be uniform, may have different halogen compositions inside and outside, or may have a layered structure. These emulsion grains are described in British Patent No. 1,027,146,
U.S. Pat.Nos. 3,505,068, 4,444,877 and Japanese Patent Application No. 58
-248469 etc. are disclosed. Further, silver halides having different compositions may be joined by epitaxial joining, or may be joined with compounds other than silver halides such as silver rhodanide and lead oxide. These emulsion grains are described in U.S. Patent Nos. 4,094,684, 4,142,900 and
4,459,353, British Patent 2,038,792, U.S. Patent 4,34
9,622, 4,395,478, 4,433,501, 4,463,087
No. 3,656,962, No. 3,852,067, JP-A-59-162540
No., etc.

Also, a mixture of particles having various crystal forms may be used.

The emulsion of the present invention is usually subjected to physical ripening, chemical ripening and spectral sensitization. Additives used in such a process are described in Research Disclosure No. 17643 and No. 18716, and the corresponding parts are summarized in the table below.

Known photographic additives that can be used in the present invention are also described in the above-mentioned two Research Disclosures, and the locations described in the table below are shown.

Various color couplers can be used in the present invention, specific examples of which are described in the patents described in Research Disclosure (RD) No. 17643, VII-CG. As the dye-forming coupler, a coupler that gives the three primary colors of the subtractive method (that is, yellow, magenta and cyan) by color development is important, and the
Specific examples of the equivalent or 2-equivalent coupler are RD17643, VII described above.
-In addition to the couplers described in the patents of C and D,
The following can be preferably used in the present invention.

A typical example of the yellow coupler that can be used in the present invention is a hydrophobic acylacetamide coupler having a ballast group. A specific example is U.S. Pat.
No. 7,210, No. 2,875,057 and No. 3,265,506. In the present invention, it is preferable to use a two-equivalent yellow coupler, and US Pat.Nos. 3,408,194 and 3,4
No. 47,928, No. 3,933,501 and No. 4,022,620 oxygen atom desorption type yellow couplers described in JP-B-58-10739, U.S. Pat.Nos. 4,401,752 and 4,3.
26,024, RD18053 (April 1979), British Patent No. 1,425,0
No. 20, West German Application Publication No. 2,219,917, No. 2,261,361,
Typical examples thereof include nitrogen atom-releasing yellow couplers described in JP-A-2,329,587 and JP-A-2,433,812. The α-pivaloyl acetanilide type couplers are excellent in the fastness of color forming dyes, especially the light fastness, while the α-benzoyl acetanilide type couplers can obtain a high color density.

Examples of magenta couplers that can be used in the present invention include hydrophobic indazolone or cyanoacetyl, preferably 5-pyrazolone and birazoloazole couplers having a ballast group. The 5-pyrazolone-based coupler is preferably a coupler in which the 3-position is substituted with an arylamino group or an acylamino group, from the viewpoint of the hue and color density of the color forming dye, and a typical example thereof is U.S. Pat.
1,082, 2,343,703, 2,600,788, 2,9
No. 08,573, No. 3,062,653, No. 3,152,896 and No. 3,936,015. US Pat. No. 4,310,61 as a leaving group for 2-equivalent 5-pyrazolone based couplers.
Nitrogen atom leaving groups described in No. 9 or U.S. Pat.
The arylthio groups described in 1,897 are particularly preferred.
Further, it has a ballast group described in European Patent No. 73,636. 5
-Pyrazolone couplers provide high color density. Examples of pyrazoloazole-based couplers include U.S. Pat.
No. 879 pyrazolobenzimidazoles, preferably pyrazolo [5,1−, described in US Pat. No. 3,725,067.
c] [1,2,4] triazoles, Research Disclosure 24220 (June 1984) and the pyrazolotetrazoles and Research Disclosure 24230 (JP 1984-60-33552) described in JP-A-60-33552. Month) and JP-A-60-43
The pyrazolopyrazoles described in No. 659 can be mentioned. The imidazo [1,2-b] pyrazoles described in U.S. Pat.No. 4,500,630 are preferable in view of the small yellow sub-absorption of the color forming dye and the light fastness, and the pyrazolo [1,2] described in European Patent 119,860A. 5-b] [1,2,4] triazole is particularly preferred.

Cyan couplers that can be used in the present invention include hydrophobic and diffusion-resistant naphthol-based and phenol-based couplers, and the naphthol-based couplers described in U.S. Pat.No. 2,474,293, preferably U.S. Pat.Nos. 4,052,212 and 4 , 1
Representative examples thereof include oxygen atom elimination type two-equivalent naphthol couplers described in Nos. 46,396, 4,228,233 and 4,296,200. Further, specific examples of the phenol-based coupler are described in U.S. Patent Nos. 2,369,929 and 2,801,171.
No. 2,772,162, No. 2,895,826 and the like. Cyan couplers which are fast against humidity and temperature are preferably used in the present invention, and typical examples thereof include a phenol having an alkyl group of ethyl group or higher at the meta 1-position of the phenol nucleus described in US Pat. No. 3,772,002. Cyan couplers, U.S. Pat.Nos. 2,772,162 and 1
3,758,308, 4,126,396, 4,334,011, 4,327,173, West German Patent Publication 3,329,729 and European Patent 121,365 and 2,5-diacylamino-substituted phenol couplers and U.S. Pat.
Nos. 4,333,999, 4,451,559 and 4,42
No. 7,767, and the like, phenol couplers having a phenylureido group at the 2-position and an acylamino group at the 5-position, and the like.

In order to correct the unnecessary absorption of the color forming dye, it is preferable to mask the color sensitive material for photographing with a colored coupler in combination. U.S. Pat.No. 4,163,670 and JP-B-57-
Typical examples include yellow-colored magenta couplers described in 39413 and the like or magenta-colored cyan couplers described in U.S. Pat. Nos. 4,004,029 and 4,138,258 and British Patent 1,146,368. Other colored couplers are described in RD17643, Item VII-G above.

The graininess can be improved by using a coupler in which the color forming dye has an appropriate diffusibility. Such couplers are
Specific examples of magenta couplers are described in U.S. Pat. No. 4,366,237 and British Patent 2,125,570, and specific examples of yellow, magenta or cyan couplers are described in European Patent No. 96,570 and West German Patent Publication No. 3,234,533.

The dye-forming coupler and the above-mentioned special coupler may form a dimer or higher polymer. Typical examples of polymerized dye forming couplers are described in US Pat. Nos. 3,451,820 and 4,080,211. Specific examples of polymerized magenta couplers are described in British Patent No. 2,102,173 and U.S. Patent No. 4,367,282.

Couplers that release a photographically useful residue upon coupling are also preferably used in the present invention. As the DIR coupler releasing the development inhibitor, the couplers of the patents described in the above-mentioned RD17643, VII to F are useful.

A preferred combination with the present invention is JP-A-57-151.
Developer inactivation type represented by 944; U.S. Pat. No. 4,248,962
And the timing type represented by JP-A-57-154234; the reaction type represented by JP-A-59-39653, and particularly preferable are JP-A-57-151944 and JP-A-58-217932. ,
Developer inactivation type DIR couplers described in Japanese Patent Application Nos. 59-75474, 59-82214, 59-82214 and 59-90438, and Japanese Patent Application No. 59-39653. It is a reactive DIR coupler.

In the light-sensitive material of the present invention, a coupler capable of releasing a nucleating agent or a development accelerator or a precursor thereof imagewise during development can be used. Specific examples of such compounds are described in British Patent Nos. 2,097,140 and 2,131,188. A coupler which releases a nucleating agent having an adsorbing action on silver halide is particularly preferable, and specific examples thereof are described in JP-A-59-157638 and JP-A-59-170840.

Suitable supports that can be used in the present invention include, for example, the aforementioned R
Page 28 of D.No.17643 and page 647 of the same, No.18716 From right column 6
See page 48, left column.

The color photographic light-sensitive material according to the present invention has the above-mentioned RD, No. 1
Development can be carried out by a usual method described in pages 28 to 29 of 7643 and 651 left column to right column of No. 18716.

The color photographic light-sensitive material of the present invention is usually subjected to washing treatment or stabilizing treatment after development, bleach-fixing or fixing treatment.

In the water washing step, it is general to carry out countercurrent water washing of two or more tanks to save water. A typical example of the stabilizing treatment is a multistage countercurrent stabilizing treatment as described in JP-A-57-8543 instead of the water washing step. In the case of this step, a countercurrent bath of 2 to 9 tanks is required. Various compounds are added to the stabilizing bath for the purpose of stabilizing the image. For example, various buffers (eg borate, metaborate, borax, phosphate, carbonate, potassium hydroxide, sodium hydroxide, aqueous ammonia mono) for adjusting the membrane pH (eg pH 3 to 8). Representative examples thereof include carboxylic acid, dicarboxylic acid, polycarboxylic acid and the like) and formalin. In addition, water softener (inorganic phosphoric acid,
Aminopolycarboxylic acids, organic phosphoric acids, aminopolyphosphonic acids, phosphonocarboxylic acids, etc.), bactericides (benzisothiazolinone, irithiazolone, 4-thiazolinebenzimidazole, halogenated phenols, etc.), surfactants, fluorescent enhancement Various additives such as whitening agents and hardening agents may be used, and two or more kinds of the same or different target compounds may be used in combination.

Further, it is preferable to add various ammonium salts such as ammonium chloride, ammonium nitrate, ammonium sulfate, ammonium phosphate, ammonium sulfite, and ammonium thiosulfate as a film pH adjuster after the treatment.

The present invention can be applied to various color light-sensitive materials. Typical examples include color negative films for general use or movies, color reversal films for slides or televisions, color papers, color positive films and color reversal papers. The present invention is
It can be particularly preferably used for a film for duplication.

(Example 1) Hereinafter, the present invention will be described in detail with reference to Examples, but the present invention is not limited thereto.

As a sample, a multi-layer color light-sensitive material having the following composition was prepared on a cellulose triacetate film support.

1st layer: Anti-halation layer Black colloidal wire ・ ・ ・ 0.10g / m ² UV absorber C-1 ・ ・ ・ 0.10g / m ² UV absorber C-2 ・ ・ ・ ・ ・ 0.70g / Gelatin layer containing m ² Second layer; Intermediate layer Compound H-1 ... 0.10 g / m ² Silver iodobromide emulsion (silver iodide 1 mol%, average grain size 0.07
μ) ・ ・ Silver coating amount (the same applies below) gelatin layer containing 0.15 g / m ² 3rd layer; 1st red-sensitive emulsion Silver iodobromide emulsion ・ ・ ・ ・ 0.30 g / m ² (silver iodide) 6 mol%, average particle size 0.10 μ) Sensitizing dye A: 7.0 × 10 ⁻⁵ mol per mol of silver Sensitizing dye B: 2.0 × 10 ⁻ per mol of silver 2.0 × for the ⁵ mol sensitizing dye C · · · · · 1 mol of silver relative to 2.8 × 10 ^-4 mol sensitizing dye D · · · · · 1 mol of silver 10 ^-5 mol coupler C-3 0.20 g / m ² coupler C-4 0.01 g / m ² coupler C-5 0.01 g / m ² containing gelatin layer 4th layer; second red-sensitive emulsion layer silver iodobromide emulsion ・ ・ ・ 0.25 g / m ² (Silver iodide 6 mol%, average grain size 0.20 μ) Sensitizing dye A: 5.2 × 10 ^-5 mol per 1 mol of silver Sensitizing dye B: 1 mol of silver On the other hand, 1.5 × 10 ^-5 mol Sensitizing dye C: 2.1 × 10 ^-4 mol Sensitizing dye D ... ... 1.5 × 10 ^-5 moles relative to 1 mole of silver Coupler C-3 0.20 g / m ² coupler C-4 0.10 g / m ² coupler C-5 0.01 g / m ² gelatin layer 5th layer; Third red-sensitive emulsion layer Silver iodobromide emulsion: 0.05 g / m ² (6 mol% silver iodide, average grain size 0.25 μ) Sensitizing dye A: 1 mol silver In contrast, 5.5 × 10 ^-5 mol Sensitizing dye B: 1.6 × 10 ^-5 mol per mol of silver Sensitizing dye C: 2.2 × 10 ^-5 mol per mol of silver Sensitizing dye D: Gelatin layer containing 1.6 × 10 ^-5 mol coupler C-3 0.10 g / m ² with respect to 1 mol of silver Sixth layer; Intermediate layer Compound H-1・ Gelatin layer containing 0.02 g / m ² 7th layer; 1st green-sensitive emulsion layer Silver iodobromide emulsion 0.15 g / m ² (5 mol% silver iodide, average grain size 0.10 μ ) sensitizing dye E · · · · · 1 mol of silver relative to 4.0 × 10 ^-4 mol sensitizing dye F · · · · · silver 4.0 × 10 moles ^-5 mol Coupler C-6 ······ 0.20g / m ² Coupler C-7 ······ 0.04g / m ² Coupler C-8 · · · · · · 0.04g / m ² Coupler C-4 ・ ・ ・ ・ Gelatin layer containing 0.01g / m ² 8th layer; 2nd green-sensitive emulsion layer Silver iodobromide emulsion ・ ・ 0.15g / m ² (Silver iodide 6 mol%, average grain size 0.20 μ) Sensitizing dye E: 3.5 × 10 ⁻⁴ mol per mol of silver Sensitizing dye F: per mol of silver 3.5 × 10 ^-5 mol Coupler C-9 ・ ・ ・ ・ ・ ・ 0.04g / m ² Coupler C-7 ・ ・ ・ 0.001g / m ² Coupler C-8 ・ ・ ・ 0.001g / m ² Gelatin layer containing 9th layer; third green emulsion layer Silver iodobromide emulsion 0.40 g / m ² (6 mol% silver iodide, average grain size 0.25 μ) Sensitizing dye E・ ・ ・ ・ 3.0 × 10 ^-4 mol per 1 mol of silver Sensitizing dye F ・ ・ ・ Sane 3.0 × 10 ^-5 mol per 1 mol of silver Coupler C-9: 0.03 g / m ² Coupler C-8: gelatin layer containing 0.001 g / m ² 10th layer: Yellow filter layer Yellow colloidal silver: 0.050 g / m ² Compound H-1 ··········· Gel layer containing 0.20 g / m ² 11th layer; 1st blue-sensitive emulsion layer Emulsion described in Table 2 (coated silver amount is also listed in Table 2) ) Coupler C-10: Gelatin layer containing 0.68 g / m ² 12th layer; second blue-sensitive emulsion layer Emulsion described in Table 2 (coating silver amount is also listed in Table 2) Coupler C- 10 ・ ・ ・ Gelatin layer containing 0.22 g / m ² 13th layer; 3rd blue sensitive emulsion layer Emulsion described in Table 2 (coated silver amount is also shown in Table 2) Coupler C-10 ・ ・ ・・ ・ Gelatin layer containing 0.19g / m ² (However, this layer is not included in the samples in Table 2) 14th layer; 1st protective layer UV absorber C-1 ・ ・ ・ ・ 0.20g / m ² UV Zera containing absorbent ^C-2 ···· 0.90g / m 2 Emission layer 15th layer: second protective layer Polymethyl methacrylate particles (diameter 1.5 microns) · · · ·
Gelatin layer containing 0.05 g / m ^{2 In} each layer, a gelatin hardening agent C-11 and a surfactant were added in addition to the above composition.

The compounds used to make the samples are shown below.

C-11 (CH ₂ = CHSO ₂ CH ₂ CONHCH _{2 2} Further, the emulsions used in the first to third blue-sensitive layers are shown in Table 1 below. All halogen compositions are 1 mol% silver iodide
It is a silver iodobromide containing.

The contents of samples thus prepared are shown in the first half of Table 2.

In order to evaluate the sharpness of the red-sensitive layer and the green-sensitive layer of these samples, a black sharp contrast image and a filter (frequency 30 cycles / mm) having a linear striped repeating pattern having the same density difference as that It was exposed to white and processed by the following method. The processing temperature is 38 ° C.

Color development 3 minutes 15 seconds Bleaching 6 minutes 30 seconds Washing with water 2 minutes 10 seconds Fixing 4 minutes 20 seconds Washing with water 3 minutes 15 seconds Stability 1 minute 05 seconds The composition of the treatment solution used in each process is as follows. It was

Color developer Diethylenetriamine pentaacetic acid 1.0 g 1-Hydroxyethylidene-1,1-diphosphonic acid 2.0 g Sodium sulfite 4.0 g Potassium carbonate 30.0 g Potassium bromide 1.4 g Potassium iodide 1.3 mg Hydroxylamine sulfate 4- (N-ethyl-) N-β-
Hydroxyethylamino) -2-methylaniline sulfate
4.5g Water added 1.0l pH10.0 Bleaching solution Ethylenediaminetetraacetic acid ferric ammonium salt 100.0g Ethylenediaminetetraacetic acid disodium salt 10.0g Ammonium bromide 150.0g Ammonium nitrate 10.0g Water added 1.0l pH6.0 Fixer Ethylenediaminetetraacetic acid disodium salt 1.0g Sodium sulfite 4.0g Ammonium thiosulfate aqueous solution (70%) 175.0ml Sodium bisulfite 4.6g Water is added 1.0l pH6.6 Stabilized solution Formalin (40%) 2.0ml Polyoxyethylene-p- Monononylphenyl ether (average degree of polymerization: 10) 0.3g Water was added to 1.0l The concentration was measured with a micro densitometer through a G filter and an R filter, and the square wave response function [Square wave Response Function ( SRF)].

Dmax: Maximum value of micro-density of striped pattern image Dmin: Minimum value of micro-density of striped pattern image ΔD: Difference between maximum density and minimum density of sharp contrast image The larger the SRF value, the better the sharpness. .

These results are summarized and shown in the latter half of Table 2.

1. The sample of the present invention is far superior in sharpness of the red-sensitive layer and the green-sensitive layer as compared with the comparative sample (large particle volume, polydisperse), sample (polydisperse), sample (large particle volume). ing.

2. The sharpness of the red-sensitive layer and the green-sensitive layer of the sample of the present invention in which the emulsion monodispersity of the blue-sensitive layer is further increased as compared with the sample of the present invention is further improved.

On the other hand, compared to the comparative sample, the comparative sample in which the monodispersibility of the emulsion layer of the blue sensitive layer was increased, the sharpness of the red sensitive layer and the green sensitive layer was slightly improved compared to the sample. However, it is not so remarkable as the sample of the present invention.

3. Blue-sensitive layer 2 layer structure for comparison sample, is blue-sensitive layer 3
The sharpness of the red-sensitive layer and the green-sensitive layer is far inferior to that of the sample of the present invention having a layer structure.

From the above, it can be seen that the sample of the present invention is very excellent in the sharpness of the red-sensitive layer and the green-sensitive layer.

(Example 2) A sample No. was prepared again according to the example of the present application. For the sample No., the emulsion of the third blue-sensitive layer was referred to from EM-12, and the emulsion No. H of Example 1 of the reference (JP-A-59-149349) (average grain size 0.8 μ, coefficient of variation 0.16, average) A sample No. was prepared in exactly the same manner as the sample No., except that the particle volume was changed to 0.268 μ ³ ) with an equal amount of silver. Further, with respect to Sample No. 3, the emulsion of the third blue-sensitive layer was changed from EM-12 to emulsion having an average grain size of 0.5 μ described in page 380 of the above reference (emulsion name is EM-25) (coefficient of variation 0.16). , Sample No. was prepared in exactly the same manner as Sample No. except that the average particle volume was changed to 0.065 μ ³ ) with the same amount of silver.

The sample No. thus prepared was treated according to the method described in the examples of the present application, the SRF values of the red-sensitive layer and the green-sensitive layer were determined, and the sharpness of the red-sensitive layer and the green-sensitive layer was evaluated. did. The results are shown in Table 3. Reference emulsion No. H, EM-2
In contrast to Sample No. 5 in which No. 5 was used for the third blue-sensitive layer, Sample No. of the present invention was far superior in the sharpness of the red-sensitive layer and the green-sensitive layer and was the highest sensitivity layer of the blue-sensitive layer The effect of the present invention using a monodisperse emulsion having an average grain volume of 0.06 μ ³ or less is clear.

Claims (1)

[Claims] 1. A silver halide color photographic light-sensitive material in which at least one red-sensitive emulsion layer and green-sensitive emulsion layer, and three blue-sensitive emulsion layers having different sensitivities are provided on a support. Characterized in that the ^three blue-sensitive emulsion layers are provided as the light-sensitive emulsion layers located farthest from, and the blue-sensitive emulsion layer having the highest sensitivity is composed of a monodisperse silver halide emulsion having an average grain volume of 0.055 μ ³ or less. And a silver halide color photographic light-sensitive material.