JPS63294560A - Silver halide color photographic sensitive material having improved sharpness and granular characteristic - Google Patents

Abstract

PURPOSE:To improve sharpness and granular characteristic by incorporating a 2 equiv. coupler at a specific ratio into at least one emulsion layer, except a high-sensitivity layer, among plural emulsion layers and providing a colloidal layer between the high-sensitivity layer and the 2 equiv. coupler layer. CONSTITUTION:The plural photosensitive silver halide emulsion layers which have the same color sensitivity and different photosensitivities are formed on a base. At least one emulsion layer, except the emulsion layer having the highest photosensitivity, among the plural emulsion layers contains the 2 equiv. coupler at >=50% molar ratio. The non-photosensitive hydrophilic colloidal layer is further formed between the photosensitive silver halide emulsion layer having the highest photosensitivity and the photosensitive silver halide emulsion layer contg. the 2 equiv. coupler layer (2 equiv. coupler layer). The higher sensitivity and the better sharpness and granular characteristic are thereby provided.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a silver halide color photographic light-sensitive material, and more particularly to a silver halide color photographic light-sensitive material with significantly improved sharpness and graininess.

[Background of the invention]

In recent years, the image quality of silver halide color photographic materials (hereinafter referred to as color photographic materials) has improved significantly, but sharpness and graininess are still not sufficient.

In particular, small format negative color film (
110 film, disk film, etc.), image roughness (granularity) and poor sharpness significantly reduce the level of print image quality.

This is because the graininess and sharpness of negative film are not high enough to withstand high-magnification printing.

In order to solve the above-mentioned problems, the inventors of the present invention have conducted various studies, and as a result of their research, the amount of silver to be applied can be reduced due to a significant reduction in the amount of coated silver and good coloring properties, making it possible to reduce the amount of silver used and make it suitable for thinner films. It has been found that the use of highly advantageous 2-equivalent couplers also has a significant effect on improving sharpness.

However, silver halide emulsion layers containing a high proportion of 2-equivalent couplers are highly color-forming due to the nature of the couplers, so that they can be used for diffusion projection, especially when placed adjacent to more sensitive silver halide emulsion layers. The effect is stronger (received,
It has been found that there is a drawback that the graininess is significantly deteriorated and, at the same time, the sharpness is decreased due to color bleeding due to radial diffusion between the layers of the oxidized product of the color developing agent.

Therefore, there is a need to develop a technique for improving graininess and sharpness in systems using two-equivalent couplers.

[Purpose of the invention]

An object of the present invention is to provide a silver halide color photographic material which has significantly improved not only sharpness but also graininess.

[Structure of the invention]

The present invention provides a silver halide color photographic light-sensitive material having a plurality of light-sensitive silver halide emulsion layers having the same color sensitivity and different photosensitivity on a support. (hereinafter referred to as a high-speed layer).

) at least one of the emulsion layers other than ) contains a 2-equivalent coupler in a molar ratio of 50% or more, and the above amount also contains a photosensitive silver halide emulsion layer with high photosensitivity (high-sensitivity layer) and the 2-equivalent coupler. A silver halide color characterized by having a non-photosensitive hydrophilic colloid layer (hereinafter referred to as a colloid layer) between a light-sensitive silver halide emulsion layer (hereinafter referred to as a 2-equivalent layer). With photosensitive materials,
The above objective was achieved.

In the present invention, at least one set of a plurality of photosensitive silver halide emulsion layers having the same color sensitivity but different photosensitivity may be formed on the support. Two or more sets of a plurality of emulsion layers having the same color sensitivity but different photosensitivity may be formed. In that case, it is sufficient that the layers have different sensitivities for one set, and the other set does not necessarily have to have a plurality of color-sensitive emulsion layers, or may have a plurality of color-sensitive emulsion layers with different sensitivities. It does not need to have an emulsion layer.

Next, in the present invention, the 2-equivalent coupler contained in the 2-equivalent coupler layer will be described. The exemplified compounds are yellow, magenta, and cyan couplers that are generally used in multicolor light-sensitive materials.The 2-equivalent coupler used in the present invention is represented by the following general formula (1).

General formula [I] C*p In the formula, G represents a coupler residue, the book represents the coupling position of the coupler, and X is a dye formed by coupling with an oxidized product of an aromatic primary amine color developing agent. represents a group that leaves when

Among the coupler residues represented by Cp, typical yellow coupler residues are disclosed in U.S. Patent No. 2.298.
, No. 443, No. 2.407.210, No. 2,87
5.057, 3.048.194, 3.2
No. 65,506, No. 3,447,928 and “Farbkpraerineriteratourwersicht Agfa Minteiling (Band-)” (Farbk)
upplereineLiteraLurubersi
echt Agfa former Lteilung (Band I
I)) pages 112-126 (1961). Among these, acylacetanilides such as benzoylacetanilide and pivaloylacetanilide are preferred.

Representative magenta coupler residues include U.S. Patent Nos. 2,369.489 and 2.343.703;
Same No. 2.311.082, Same No. 2.600.788, Same No. 2.908゜573, Same No. 3.062.653
No. 3.152,896, No. 3.519,42
No. 9, No. 3.725.067, No. 4.540.6
No. 54, JP-A No. 59-162548, and the above-mentioned Ag
fa Mitteilung (Iland II)
126-156 (1961), etc. Among these, pyrazolone or pyrazoloazole (eg, pyrazoloimidazole, pyrazolotriazole, etc.) are preferred.

A typical cyan coupler residue is U.S. Patent No. 2
．． 367, 531, No. 2,423.730, No. 2474.293, No. 2.772.162, No. 2.895.826, No. 3.002.836,
3.034,892, 3.041.236 and the above-mentioned Agfa Mitteilung (Bin
dn) pages 156-175 (1961).

Among these, phenols or naphthols are preferred.

Examples of the leaving group represented by with at least one atom selected from 5 to 6
represents a group of atoms required to form a membered ring), monovalent groups such as acylamino groups and sulfonamide groups, and divalent groups such as alkylene groups, and in the case of divalent groups, they form a dimer with X. .

Specific examples are given below.

Halogen atom: chlorine, bromine, fluorine alkoxy group: 0Czlls, -0CIlzCONllCII□
CIIxOC1l+.

CIl! I C+zlhiC1 proverb 1
1 mushroom 5 Aryloxy group: Heterocyclic oxy group: Alkylthio group: 5CIIs, 5CJs, -5Csll+y, -3
Ct*lhs.

-3CI1gCOOCzlls, SCIIgCIhO
Czlls lshiυυu F
F heterocyclic thio group: ,・゛-゛・.

-N〆-: Virazolyl group, imidazolyl group, triazolyl group.

-NIICO(CFzCFt)zll.

As a 2-equivalent yellow coupler, the following general formula (II)
and (lt[) are preferred.

General formula (III) In general formula (II), (III), R6Rz represents a hydrogen atom or a substituent, k and l represent 1 to 5,
When k and N are 2 or more, each R and each R2 may be the same or different, and X has the same meaning as X in general formula (I).

Examples of the substituents represented by R1 and R8 include halogen atoms, alkyl bonded directly or via divalent atoms or groups, cycloalkyl, aryl, and heterocycle groups.

Examples of the above divalent atoms or groups include oxygen atoms,
Nitrogen atom, sulfur atom, carbonylamino, aminocarbonyl, sulfonylamino, aminosulfonyl, amino, carbonyl, carbonyloxy, oxycarbonyl,
ureylene, thioureylene, thiocarbonylamino,
Examples include sulfonyl and sulfonyloxy.

Furthermore, the alkyl, cycloalkyl, aryl, and heterocycle include those having a substituent, such as a halogen atom, nitro, cyano, alkyl, alkenyl, cycloalkyl, aryl, alkoxy, aryloxy, alkoxy Carbonyl, aryloxycarbonyl, carboxy, sulfo, sulfamoyl, carbamoyl, acylamino, ureido, urethane, sulfonamide, heterocycle, arylsulfonyl, alkylsulfonyl, arylthio, alkylthio, alkylamino, anilino, hydroxy, imide, acyl, etc. .

In the 2-equivalent yellow coupler, X is represented by the general formula (
Examples include those exemplified in 1), and those (synonymous with X) are preferred.

Further, the general formula (II) includes cases where R1 or X forms a dimer or more multimer, and the general formula ([[) is R,
2f with Rg or X! This includes cases in which multimers of more than one body are formed.

As a 2-equivalent magenta coupler, use the following one-stage % formula % is preferable.

NN In the above general formulas (II/) to [■], R5 represents a substituent, and RoRx, X, and II are the general formula [■].

It has the same meaning as R1, Rt, X, and J in (III), and l is 2
In the above case, each R2 may be the same or different.

Examples of R,,R, are '-R in general formula m),
, R, and examples of R1 include alkyl, cycloalkyl, aryl, heterocycle, etc., including those with substituents, and examples of the substituents include general Examples of substituents for each group listed as examples of R in formula (II) include those exemplified as substituents.

In the 2-equivalent magenta coupler, examples of X include those exemplified in general formula (1), and an alkylthio group,
Particularly preferred are arylthio group (synonymous with aryloxy) and alkylene group.

In addition, general formulas (rl/) and (V) include cases where R1, R3 or X forms a dimer or more multimer, and general formulas (Vl) and [■] represent R1, R1 or So 2f!
This includes the case where a multimer of more than one body is formed.

As a 2-equivalent cyan coupler, the following general formula (■), (D
Those represented by O and (X) are preferred.

In the formula, R1 and R3 are synonymous with Rt and Rs in the general formula (mV), R4 represents a substituent, m is 1 to 3, n is 1 to 2, p is 1 to 5, m, n , p is 2 or more, each Rt may be the same or different.

Examples of Rg and R3 include those exemplified in the general formula (■), and as R4, in the general formula (IV),
Examples of R1 include those listed above.

In the 2-equivalent cyan coupler, examples of X include those exemplified in general formula (1), with halogen atoms, alkoxy groups, aryloxy groups, and sulfonamide groups being particularly preferred.

In addition, the general formula [■] and (X) include the case where Rz, Rs or X forms a dimer or more multimer, and the general formula (I
X) includes cases where Rz, Ra, Ra or X forms a multimer of 2ffi or more.

Specific examples of the two-equivalent coupler used in the present invention are listed below, but the invention is not limited thereto.

2 equivalent yellow filler Y-9 ps I Y-19 Y-20 〜−−j rri ~-Ichino 2-equivalent magenta coupler C.I. C.I. C.I. C.I. M-14 C+@l1m+ C11゜ C.I.

a M-26 M-30 x:y 50 + 50 2nd view cyan coupler 0CIIICONIIICII□CIIzOCIh 0CH ICH Mushroom 50IC1N.

NHCOCIIICIl□C00II C-9 NHCOCIhCIItCOOII NIIS (hcll+ C00C411? 0CIIzCIItSCHtCOOH OCONIICdlt C00II OCll.

411I C&’l13 +1. .

Ca II * C-31 x: y true 40: 60 X; y-50; 50 ・−＝.

In the present invention, the ratio of the 2-equivalent coupler in the coupler contained in the 2-equivalent coupler layer is 50 mol% or more,
In order to bring out the effects of the present invention even more, the ratio is preferably 70% or more, particularly preferably 90% or more.

The amount of all the couplers added in the high-sensitivity layer in the present invention is preferably 1 x 10-4 to 1 mol, more preferably 1 x 10-3 to 1 mol, particularly 3 x 10 -3 to 8X10-' moles are preferred. In addition, the total amount of couplers contained in the two-equivalent strength plastic layer in the present invention is preferably 1X10- to 1 mole of silver.
'~10 mol, more preferably 5X10-''~5
8XIO-' to 3 moles are particularly preferred.

The photosensitive material of the present invention has the above-mentioned colloid layer between the high-sensitivity layer and the double-layer plastic layer, and gelatin, protein, or a synthetic hydrophilic polymer is used to form the hydrophilic colloid layer. Gelatin is particularly preferred. The hydrophilic colloid layer is non-photosensitive, and non-photosensitive means that it is not sensitive to light during imagewise exposure, or that it is sensitive to only a negligible amount. The colloid layer may also contain a substance that reacts with the oxidized color developing agent.

The photographic light-sensitive material of the present invention has a plurality of emulsion layers having the same color sensitivity but different sensitivities. Here, the same color sensitivity refers to the property of being sensitive to wavelength light in substantially the same wavelength range. For example, It is sufficient if they have the same color sensitivity such as blue sensitivity, green sensitivity, or red sensitivity.

The photographic light-sensitive material of the present invention may have other emulsion layers having the same color sensitivity in addition to the high-speed layer and the 2-equivalent strength layer, and the photosensitivity of the other emulsion layer is higher than the high-sensitivity layer. It may be between 50% and 2 equivalents, or it may be lower than 200%. The other emulsion layer may also contain a 2-equivalent coupler.

The colloid layer only needs to be present between the high-speed layer and the 2-equivalent plastic layer, and between the high-sensitivity layer and the colloid layer, or between the colloid layer and the 2-equivalent plastic layer, there is an emulsion of the above nature. There may be layers.

In cases where the number of emulsion layers having the same color sensitivity is two or three, the preferred order of the layers will be specifically shown below in order from the support side.

■22 equivalent coupler - colloid layer - high sensitivity layer ■ emulsion layer -
2-equivalent power plastic layer - colloid layer - high-sensitivity layer ■ 22-equivalent coupler - colloid layer - emulsion layer - high-sensitivity layer ■ emulsion layer - colloid 11 - 2-equivalent coupler layer - colloid layer - high-sensitivity layer ■ 22-equivalent coupler Colloid layer - Emulsion layer - Colloid layer - High-sensitivity layer - 2-equivalent coupler layer - Colloid layer - 2-equivalent coupler layer -
In colloid layer-high frequency layer (1) to (2), the layers described as emulsion layers have the same color sensitivity but different photosensitivity and do not contain a 2-equivalent coupler. In each layer configuration, the sensitive layer is located further from the support than the 2-equivalent force layer.

In the layer configurations (1) to (2), it is preferable that the three emulsion layers have lower photosensitivity as they are closer to the support.

Among (1) to (2), the layer configurations (1) to (2) are preferable, and (2) is particularly preferable.

Further, the sensitivity difference between each emulsion layer is preferably 0.1 to 1.0 in ffiogE (E is the exposure amount).

Incidentally, the sensitivity is generally adjusted by changing the grain size of silver halide grains contained in the silver halide emulsion layer, but the sensitivity in the present invention can be adjusted by such means or other various methods. The following methods can be used.

The photographic material of the present invention may be monochromatic or multicolored, but multicolor is preferable. Particularly preferred is a full-color type, and if it is a full-color type, it is formed with a blue-sensitive emulsion layer, a green-sensitive emulsion layer, and a red-sensitive emulsion layer.

The above-mentioned color-sensitive layers generally include a blue-sensitive layer, a green-sensitive layer, and a red-sensitive layer, and in the case of full-color use, all of these color-sensitive layers are laminated to form a layer. Although it is preferable that the structure of the present invention is adopted for each color-sensitive layer, the present invention is particularly effective in the green-sensitive layer.

Further, it is preferable to provide the above-mentioned colloid layer between emulsion layers having different color sensitivities.

In carrying out the present invention, any conventional silver halide emulsion can be used as the silver halide emulsion used to form the light-sensitive material.

The emulsion can be chemically sensitized by conventional methods, and can be optically sensitized to a desired wavelength range using a sensitizing dye.

Antifoggants, stabilizers, etc. can be added to the silver halide emulsion. Gelatin is advantageously used as binder for the emulsion.

The emulsion layer and other hydrophilic colloid layers can be hardened and can contain a plasticizer and a dispersion (latex) of a water-insoluble or sparingly soluble synthetic polymer.

In addition to the couplers mentioned above, the emulsion layer of the color photographic light-sensitive material of the present invention contains a colored coupler having a color correction effect, a competitive coupler, and a coupling with an oxidized form of a developing agent to promote development. Photographic additives such as bleaching accelerators, bleach accelerators, developers, silver halide solvents, toning agents, hardeners, fogging agents, antifoggants, chemical sensitizers, spectral sensitizers, and desensitizers. Compounds that release useful fragments can be used.

The photosensitive material can be provided with auxiliary layers such as a filter layer, an antihalation layer, and an antiirradiation layer. These layers and/or the emulsion layer may contain dyes that are washed out of the light-sensitive material or bleached during the development process.

A formalin scavenger-1 fluorescent whitening agent, a matting agent, a lubricant, an image stabilizer, a surfactant, a color fog preventive agent, a development accelerator, a development retarder, and a bleach accelerator can be added to the photosensitive material.

As the support for the photosensitive material of the present invention, paper laminated with polyethylene or the like, polyethylene terephthalate film, baryta paper, cellulose triacetate, etc. can be used.

In order to obtain a dye image using the light-sensitive material of the present invention, commonly known color photographic processing is carried out after exposure [Example] Specific examples of the present invention will be described below. The embodiments are not limited to these.

In all the examples below, the amount added in the silver halide photographic light-sensitive material is per 1 or 2 unless otherwise specified. In addition, 1 halide and colloidal silver are shown in terms of silver.

Multilayer color photographic element sample 1 was prepared by sequentially forming each layer having the composition shown below on a triacetyl cellulose film support from the support side.

Sample-1 (comparison) First layer; antihalation layer (HC-1) Gelatin layer containing black colloidal silver. (Film thickness 1.5 μm).

Second layer; intermediate layer (1,L,) Gelatin layer containing an emulsified dispersion of 2.5-di-t-octylhydroquinone. (Film thickness 1.0 μm).

3rd layer; low sensitivity red-sensitive silver halide emulsion layer average grain size (r
) 0.40.17 m, monodispersed emulsion consisting of 8 gBrl containing 6.0 mol% of Agl (emulsion... Silver coverage: 1.8 g/m") Sensitizing dye ■...・5.0 x 10-' mol sensitizing dye for 1 mol of silver...
...0.8 per mole of silver
85 mol colored cyan coupler (CC-1)... 0.005 mol DIR compound (D-1)... 0.0015 mol DIR compound (D -2)... 0.002 mol per mol of silver Film thickness 3.0 μm 4th layer: High sensitivity red-sensitive silver halide emulsion layer (RH-1) Average grain size (r) 0. 8 μm, monodispersed emulsion (emulsion ■) consisting of AgBr1 containing 16.0 mol% of 8g... Silver coating amount 1.3 g/m Sensitizing dye I... For 1 mol of silver 2.5 x 10-' molar sensitizing dye■
...... 0.8 x 10-' mol-cyan coupler (C'-2) for 1 mol of silver... 0 for 1 mol of silver
．． 027 mol Colored cyan coupler (CC-1)...0.0015 mol per 1 mol of il DIR compound (D-2)... 0.001 mol per mol of silver Film thickness 1.5 μm 5th layer; middle layer (1, L,) Same as the 2nd layer, gelatin layer. (Film thickness 1.5 μm).

6th layer - low-sensitivity green-sensitive silver halide emulsion layer (GL-1) Emulsion - ■... Silver coating amount 1.5 g/m Sensitizing dye ■... For 1 mole of silver 2. OX 10-'molar sensitizing dye ■・
... 1 mole of silver. OX 10-'mol magenta coupler (M'-1)...! ! ! 0 per mole
．． 090 mol Colored magenta coupler (CM-1)...i 0.004 mol per 1 mol DIR compound (D-1)... 1ffl 0.0010 mol DIR compound ( D-3)... 0.0030 mol per mol of silver Film thickness 3.5 μm 7th layer; Highly sensitive green-sensitive silver halide emulsion layer (GH-1) Emulsion - ■... ... Coated silver 11.4 g/rrr sensitizing dye ■... 1.2Xto-' mole sensitizing dye for 1 mole of silver ■...
...0.8 x 10'' mole per mole of silver Magenta coupler (M'-.1) ...0.0 per mole of silver
15 mol colored magenta coupler (CM-1)...0.002 mol for 1 mol of primate DIR compound (D-3)... 0.0010 mol for 1 mol of primates and film Thickness 2.5 μm 8th layer: Yellow filter single layer (YC-1) A gelatin layer containing an emulsified dispersion of yellow colloidal silver and 2.5-di-t-octylhydroquinone (film thickness 1.5 μm).

9th layer; low sensitivity blue-sensitive silver halide emulsion layer (BL-1)
AgBr containing 16 mol% Ag with an average particle size of 0.48 μm
Monodispersed emulsion consisting of I (emulsion ■)... Trowel coating 110.9 g/A sensitizing dye ■... 1.3xlO-' mol yellow coupler (as exemplified above) per 1 mol silver Compound Y-5) 0.29 mol per 1 mol of silver Film thickness 3.0 μm 10th layer; Highly sensitive blue-sensitive silver halide emulsion layer (BH-1
) AgBr containing 17 mol% Ag with an average particle size of 0.8 μm
Monodispersed emulsion (emulsion ■) consisting of 1... Silver coating amount 0.5 g/rd Sensitizing dye ■... 1.0 x 10-' mol yellow coupler ( Said exemplary compound Y-5)...0.08 mol per 1 mol of silver DIR compound (D-2)... 0.0030 mol per 1 mol of silver Film thickness 1 .7 μm 11th layer; 1st protective layer (Pro-1) Silver iodobromide (Agl 1 mol%, average grain size 0.07 μm
) Gelatin layer containing ultraviolet absorbers UV-1 and UV-2, silver coating amount 0.5 g/rrl. (film thickness 1.0
μm).

12th layer; Second protective layer (Pro-2) Gelatin layer (film thickness 0.5 μm) containing polymethyl methacrylate particles (diameter 1.5 μm) and formalin scavenger (H5-1).

In addition to the above composition, each layer contains a gelatin hardener (H-1
) and (H-2) and a surfactant were added.

The compounds contained in each layer are as follows.

Sensitizing dye ■; Anhydro-5,5'-dichloro-9-ethyl-3,3'-di(sulfoproyl)thiacarbocyanine hydroxide sensitizing dye ■; Anhydro-9-ethyl-3,3'-di(3 -sulfopropyl)-4゜5.4',5'-dibenzothiacarbocyanine hydroxide exacerbating dye ■; anhydro-5,5'-diphenyl-9-
Ethyl-3,3'-di(3-sulfopropyl)oxacarbocyanine hydroxide color filV; anhydro-9-ethyl-3,3'-
Di(3-sulfopropyl)-5゜6.5',6-dibensioxacarponianine hydroxide exacerbating dye ■;Anhydro-3,3'-di(3-sulfopropyl)-4,5-benzo- 5'-Methoxythiacyanine anhydroxide <1 Below margin □, ” C'-1 C'-2 C-1 0 Intermediate layer-1 (IL-1) containing gelatin between the 7th layer (high-sensitivity green-sensitive layer) and the 7th layer (high-sensitivity green-sensitive layer)
Samples 2 to 17 were prepared in the same manner as Sample 1, except that the 6th layer magenta coupler was set as shown in Table 1. . The amount of naori puller used was determined so that the combination of two types of magenta couplers had the same sensitometric properties, and the amount of gelatin used was determined according to the number of moles of coupler used.Table-1 *CM-1, D-1 Samples 1 to 17 prepared in this way were each exposed using a wedge of white light, and then subjected to the following development treatment.

Processing process (38℃) Color development 3 minutes 15 seconds Bleaching 6 minutes 30 seconds Washing with water 3 minutes 15 seconds Fixing
Wash with water for 6 minutes and 30 seconds
Stabilization for 3 minutes and 15 seconds Drying for 1 minute and 30 seconds The composition of the treatment liquid used in each treatment step is as follows.

<Color developer> 4-Amino-3-methyl-N-ethyl-N-(β-hydroxyethyl)- Aniline sulfate 4.75 g Anhydrous sodium sulfite 4.25 g Hydroxylamine disulfate 2.0 g Anhydrous Potassium carbonate 37.5 g Sodium bromide 1.3 g Nitrilotriacetic acid 3
Sodium salt (l hydrate) 2.5 g
Potassium hydroxide 1.0g Add water II! shall be.

Bleaching solution> Ethylenediaminetetraacetic acid iron ammonium salt 100.0 g Ethylenediaminetetraacetic acid diammonium salt 10.0 g Ammonium bromide 150.0 g Glacial acetic acid 10.0 ml Add water to bring the pH to 11, and adjust the pH to 11 using aqueous ammonia. = 6.0 for 8 rounds.

Fixer> Ammonium thiosulfate 175.0 g Anhydrous sodium sulfite 8.5 g Sodium metasulfite 2.3 g Add water to 1β
and adjust the pH to 6.0 using acetic acid.

Stabilizer> Formalin (37% aqueous solution) 1.5
tel Konida Sox (manufactured by Konishiroku Photo Industry ■) 7.5 mj
2 Add water to make 11.

For each sample obtained, calculate the relative sensitivity and MTF as follows.
and the RMS value was measured. Table 2 shows the results.

The relative sensitivity shows the sensitivity of the minimum concentration + 0.1, and the sample Nl
Relative values were determined with l being 100.

Regarding sharpness, the sample exposed to square wave chart was measured using Sakura Microdensitometer Model PDM-5 Type A.
R (manufactured by Konishiroku Photo Industry ■) with a slit width of 300 μm vertically
The density was measured using a slit with a width of 2 μm across, and the resolution for the input was determined as a percentage value, and the MTF (Modula
tion Transfer Function) value was calculated. It is shown as a relative value of MTF at a spatial frequency of 30 lines/wm (sample size 1 is set as 100).

The RMS value was expressed as a value 1000 times the standard deviation of the variation in density value that occurs when the density of the minimum density + 0.7 is scanned closed-mouth.

The MTF and RMS values were measured using green light in Table 2. As is clear from the results in Table 2, the sharpness of Comparative Sample 1 was improved by increasing the ratio of the equivalent coupler in the 6th layer. Although an improvement effect was observed, the graininess also deteriorated proportionately, and the image quality did not reach a satisfactory level as a color photosensitive material.

On the other hand, in samples -8, 9, 10, 15, 16 and -17 provided with the colloid layer (IL-1) according to the present invention, the reduction in graininess due to the high ratio of 2-equivalent couplers was significantly improved. Moreover, it was possible to fully bring out the original effect of improving sharpness due to the thinning of the two-equivalent coupler, and it was possible to produce new effects not predicted by conventional techniques.

Example-2 Regarding Sample-1 of Example-1, an intermediate layer (IL-2, film thickness 1.0 μm) containing gelatin was installed between the third layer and the fourth layer, and the third layer Sample-18 was prepared in the same manner except that the cyan coupler combination was changed as shown in Table-3.
~Sample-26 was created. The amount of naori puller used was determined so that two types of cyan couplers were combined to give the same sensimetry characteristics, and the amount of gelatin used was also applied in proportion to the moles of the coupler used.

Below: Margin table-3 Each sample-1 and sample-18 to 2 created in this way
6 was subjected to wedge exposure in the same manner as in Example 1, and then developed in the same manner as described above. Then relative sensitivity, MTF and R
MS values were measured in the same manner. The results obtained are shown in Table 74.

Note that the MTF and R3M values were measured using red light.

Table 4 As is clear from Table 4, in the red-sensitive layer, as in Example 1, Comparative Sample 1 has the effect of improving sharpness and improving graininess by increasing the ratio of two-color couplers. In contrast, in Samples 24, 25 and 26 according to the present invention, the sharpness was further improved and the graininess was improved by increasing the 2-equivalent coupler ratio. It can be seen that the effects of the present invention are particularly noticeable when the ratio of 2-equivalent couplers is higher.

〔Effect of the invention〕

As described above, according to the present invention, it is possible to obtain a silver halide color photographic material with high sensitivity, improved sharpness and graininess, and high image quality.

Claims (1)

[Claims] 1. In a silver halide color photographic light-sensitive material having a plurality of light-sensitive silver halide emulsion layers having the same color sensitivity and different photosensitivity on a support, the one having the highest photosensitivity among the plurality of emulsion layers. At least one emulsion layer other than the emulsion layer contains a 2-equivalent coupler in a molar ratio of 50% or more, and the photosensitive silver halide emulsion layer with the highest photosensitivity and the photosensitive halogen compound containing the 2-equivalent coupler. A silver halide color photographic material characterized by having a non-photosensitive hydrophilic colloid layer between silver emulsion layers.