JPH0443340A - Silver halide photographic sensitive material - Google Patents

Abstract

PURPOSE:To obtain high sensitivity and high sharpness and excellent whiteness by incorporating a sensitizing dye and oil-soluble brightening agent into one layer of photographic constituting layers and further providing a layer contg. a specific dye between a silver halide emulsion layer and a base. CONSTITUTION:This photosensitive material contains the sensitizing dye expressed by formula I and the oil-soluble brightening agent in one layer of the photographic constituting layers. Further, the layer contg. the dye expressed by formula II is provided between the silver halide emulsion layer and the base. In the formula II, R1, R2 denote a sulfonic acid group, carboxylic acid group, etc.; R3, R4 denote a sulfonic acid group or alkyl group having a carboxylic acid group, aryl group, etc. In the formula I, Y1, Y2 respectively denote the nonmetal atom group necessary for forming a benzothiazole ring, benzoselenazole ring, etc.; R1, R2 denote a lower alkyl group, alkyl group having a sulfo group, etc.; R3 denotes a methyl group, ethyl group, etc.; X denotes anion; n1, n2 denote 1 or 2. Excellent whiteness and improved sensitivity and sharpness are obtd. in this way.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to silver halide photographic light-sensitive materials, and more specifically to red-sensitive papers etc. that have high sensitivity and sharpness, and are excellent in zero degrees. This invention relates to silver halide photographic materials.

[Background of the Invention] Photographic paper is usually manufactured by providing a silver halide emulsion layer on a paper support, but in recent years, vapor paper has been manufactured by adding the silver halide emulsion layer and paper to improve sharpness. A dye-containing layer, namely an antihalation layer (AH
It has been practiced to provide a layer (U layer).

However, it is well known that when a dye is added to the AHU layer, residual color stains occur on the paper obtained after photographic processing, and the whiteness tends to deteriorate.

In addition, in recent years, higher sensitivity and even higher sharpness have been required to improve quality.

Therefore, if the amount of sensitizing dye or antihalation dye is increased in order to improve sharpness, the problem arises that not only residual color increases but also sensitivity decreases.

Furthermore, in so-called red-sensitive and infrared-sensitive papers having an absorption wavelength of 600 nm or more, the sensitizing dye itself tends to have residual color.

Therefore, in order to obtain high sensitivity and high sharpness as well as increase the zero degree, the present inventors continued various studies and found that the initial The inventors have found that the object can be achieved and have now completed the present invention.

[Object of the Invention] Therefore, an object of the present invention is to provide a silver halide photographic material such as paper which has excellent whiteness, high sensitivity, and high sharpness.

[Structure of the Invention] The above-mentioned object of the present invention is to provide a silver halide photographic light-sensitive material having a photographic constituent layer including at least a silver halide emulsion layer on a paper support coated with a resin on both sides. At least one layer contains at least one sensitizing dye represented by the general formula [II] and at least one oil-soluble optical brightener represented by the general formula [In], and further contains the silver halide emulsion layer. Between the support and the general formula [II]
This is achieved by a silver halide photographic material characterized by being provided with a layer containing a dye represented by:

- Formula [Summer 1] [In the formula, % R+ and R2 represent a sulfonic acid group, a carboxylic acid group, or a substituted or unsubstituted lower alkyl group, and Rs
, Ra each represents an alkyl group, an aryl group or a heterocyclic group having at least one sulfonic acid group or carboxylic acid group. ] Therefore, each is achieved.

The present invention will be explained in more detail below.

In the dye represented by the general formula [II] used in the present invention, R1 and R2 are a sulfonic acid group, a carboxylic acid group, or a lower alkyl group, and the lower alkyl group preferably has 1 to 4 carbon atoms. , for example, a methyl group, an ethyl group, etc. These groups can also have substituents.

R, , R, is an alkyl group, aryl group or heterocyclic group each having at least one sulfonic acid group or carboxylic acid group, and the alkyl group preferably has 1 to 1 carbon atoms.
4, such as methyl group, ethyl group, butyl group, etc.

Examples of the aryl group include a phenyl group.

General formula used in the present invention [! ! ] The dye represented by
Since each of R1 and R4 has at least one sulfonic acid group or carboxylic acid group, it is water-soluble and has excellent whiteness after photographic processing.

Here, typical exemplary compounds of the dye represented by the general formula [II] used in the present invention are listed, but the present invention is not limited thereto.

- Formula [II] In the silver halide photographic light-sensitive material of the present invention, at least the silver halide emulsion layer is sensitized with a sensitizing dye, preferably a compound represented by the following general formula [II].

- Formula [II - ring, benzoselenazole ring, naphthothiazole ring,
Represents a nonmetallic atomic group necessary to form a naphthoselenazole ring or quinoline ring, etc., and these heterocycles are substituted with a lower alkyl group, an alkoxy group, an aryl group, a hydroxy group, an alkoxycarbonyl group, or a halogen atom. You can leave it there.

R, and R2 each represent a lower alkyl group, an alkyl group having a sulfo group, or an alkyl group having a carboxyl group.

R8 represents a methyl group, an ethyl group, or a propyl group. X represents an anion. nl, R2 is! In addition, in this formula, Yl and Yl each represent benzothiazo, 0m represents 0 or 1, and when an inner salt, m=o.

The sensitizing dye having the structure represented by the general formula [II used in the present invention has an excellent effect on residual color after photographic processing,
When this dye is combined with the dye of general formula [II] described above, high sensitivity and high sharpness can be obtained.

Next, typical examples of the compound represented by the general formula [1] used in the present invention will be listed, but the present invention is not limited thereto.

T, -3 Margin below ■ ■ ! ! workman CH.

■ ■ ■ (CHri4SO3e C. Hl ! ! ■ ■ ■ ■ (CBriff5O, @ ■ I-, 27 ■-28 ■ ■ ■ workman so,e (CH,),C00)l (CH,),COO’ CH.

tts The optical brightener is contained in at least one of the photographic constituent layers including the hydrophilic colloid layer on the support. I[I-
Compounds represented by b), (nl-c), and (II[-d) can be preferably used.

(III-a) (I-b) [I[1-c) Not limited to these.

(Margin below) (III-d) General formula (III-a), (I[[-b), (II[-c
), (Ill-d), Yl and Y3 represent an alkyl group, Zl and Z2 represent a hydrogen atom or an alkyl group, n is l or 2 m R++Rt+R4 and R1
represents an aryl group, an alkyl group, an alkoxy group, an aryloxy group, a hydroxy group, an amino group, a cyano group, a carboxyl group, an amide group, an ester group, an alkylcarbonyl group, an alkylsulfo group or a dialkylsulfonyl group, or a hydrogen atom .

R6 and R1 represent a hydrogen atom or an alkyl group (methyl group, ethyl group, etc.).

RI& represents a phenyl group, a halogen atom or an alkyl-substituted phenyl group, and DI5 represents an amino group or an organic or secondary amine.

Next, general formulas (III-a), (III-b), (DI-
c) Specific examples of compounds represented by (I[[-d) include (ffI-13 Cm-2) CH2 CH.

([1-3) [m 4] (I[[-5) (III-6) (I[-7) [■ 11] (ml-12) (II-13) (I[l-14) [ 1l-8) (I[[-9) (I[[-10) CDI-15) (I[[-16) ([1-17) (n[-18) (If-20) (Ill-26 ) (I[[-22) [1[[-23] (I[[-243 (II[-25]) The amount of the above fluorescent brightener used is preferably 1 mg/bo~200a+g/in the finished photographic paper. 5, more preferably 5
The range is from mg/I to 50 mg/B.

The above-mentioned fluorescent brighteners may be used alone (or two or more types may be used in combination).Furthermore, fluorescent brighteners other than the above-mentioned fluorescent brighteners may be used in combination.

When a fluorescent whitening agent is used in combination, it is preferable that the total amount is the above content.

The layer to which the optical brightener is added may be in any of the photographic constituent layers on the support, including the antihalation layer, but it is preferably added to both the silver halide emulsion layer and the antihalation layer.

The method of adding the optical brightener of the present invention is to dissolve it in a high boiling point 81if4 medium together with a low boiling point solvent if necessary, mix it with an aqueous gelatin solution containing a surfactant, and use a colloid mill, homogenizer, or ultrasonic dispersion device. It is added as an emulsified dispersion using an emulsifying device such as.

The silver halide emulsions used in the present invention include conventional silver halide emulsions such as silver bromide, silver iodobromide, silver iodochloride, silver chlorobromide, silver chloroiodobromide, and silver chloride. Any used can be used.

The silver halide grains may have a uniform silver halide composition distribution within the grain, or may be core/shell grains in which the silver halide composition differs between the inside of the grain and the surface layer.

The silver halide grains may be such that a latent image is mainly formed on the surface, or may be such that a latent image is mainly formed inside the grain.

The silver halide grains may have a regular crystal shape such as a cube, octahedron, or dodecahedron, or may have an irregular crystal shape such as a spherical shape or a plate shape. In these particles, any ratio of the (100) plane to the (111) plane can be used.

Further, the particles may have a composite form of these crystal forms, or particles of various crystal forms may be mixed.

The grain size of silver halide grains is 0.05 to 3
0μ, preferably 0.1 to 20μ can be used.

The silver halide emulsion may have any grain size distribution, and may be an emulsion with a wide grain size distribution (referred to as a polydisperse emulsion), or an emulsion with a narrow grain size distribution (referred to as a monodisperse emulsion). ) may be used alone or in combination.

Further, a polydisperse emulsion and a monodisperse emulsion may be mixed and used.

The silver halide grains used in the emulsion of the present invention are formed by cadmium salts, zinc salts, lead salts, thallium salts, iridium salts or complex salts, rhodium salts or complex salts, iron salts, etc. Alternatively, it is preferable to add a metal ion using a complex salt and include it inside the particles and/or on the particle surface, and it is particularly preferable that the rhodium salt or complex salt is present in an amount of 10-6 to 10-6 mol per mol.

In the emulsion of the present invention, unnecessary soluble salts may be removed after the growth of silver halide grains is completed, or they may remain contained.

Although the photosensitive silver halide emulsion can be used as a so-called post-thermal (Pr1mltive) emulsion without chemical sensitization, it is usually chemically sensitized.

Chemical sensitization can be carried out either alone or by sulfur sensitization using active gelatin or a sulfur-containing compound that can react with silver ions, reduction sensitization using reducing substances, and noble metal sensitization using gold or other noble metal compounds. Can be used in combination. As the sulfur sensitizer, thiosulfates, thioureas, thiazoles, rhodanines, and other compounds can be used.

There are no particular restrictions on the conditions such as pH, pAg, temperature, etc. during chemical sensitization, but the pH value is preferably 4-9, especially 5-8, and the pAg value is kept at 5-11, especially 8-10. is preferable. In addition, the temperature is 40°C to 90°C,
Particularly preferred is 45°C to 75°C.

In addition to the aforementioned sulfur sensitization and gold/sulfur sensitization, the silver halide emulsion used in the present invention can be produced by reduction sensitization using a reducing substance.
A noble metal sensitization method using a noble metal compound can also be used in combination.

As the photosensitive emulsion, the above emulsion may be used alone,
Two or more emulsions may be mixed.

When carrying out the present invention, for example, 4-hydroxy-6-methyl-1,3,
Various stabilizers can also be used, including 3a,7-titrazaindene, 5-mercapto-1-phenyltetrazole, 2-mercaptobenzothiazole, and the like.

Gelatin is advantageously used as the wood-philic colloid that can be used in the silver halide emulsion layer and intermediate layer used in the present invention, but other wood-philic colloids may also be used alone or together with gelatin. can.

In the present invention, the gelatin may be either lime-treated or acid-treated. Details of the method for producing gelatin are described in The Macromolecular Chemistry of Gelatin, written by Arthur Vuis (Academic Press, published in 1964).

Examples of the hydrophilic colloids include gelatin derivatives, graft polymers of gelatin and other polymers, proteins such as albumin and casein; cellulose derivatives such as hydroxyethyl cellulose, carboxymethyl cellulose, and cellulose sulfate esters; sodium alginate;
Sugar conductors such as starch derivatives; various types such as single or copolymers of polyvinyl alcohol, polyvinyl alcohol partial acetal, poly-N-vinylpyrrolidone, polyacrylic acid, polymethacrylic acid, polyacrylamide, polyvinylimidazole, polyvinylpyrazole, etc. There are synthetic hydrophilic polymer substances.

The sensitizing dye used in the present invention is used at a concentration equivalent to that used in ordinary negative-working silver halide emulsions. In particular, it is advantageous to use the dye at a concentration that does not substantially reduce the inherent sensitivity of the silver halide emulsion. From about 1.0 x 104 to about 5 x 10-' moles of sensitizing dye per mole of silver halide is preferred, particularly from about 4 x 10-5 to 2 x 10-' moles of sensitizing dye per mole of silver halide. Preferably, a concentration of 4 molar is used.

One type of sensitizing dye or a combination of two or more sensitizing dyes may be used, and sensitizing dyes other than those mentioned above may be used in combination.

A color coupler may be added to the silver halide photographic material of the present invention, if necessary, and for example, at least one of a cyan coupler, a magenta coupler, and a yellow coupler is added.

The silver halide photographic material according to the present invention may contain water-soluble dyes other than those mentioned above as filter dyes in the hydrophilic colloid layer or for various purposes such as preventing irradiation and halation.

Such dyes include oxonol dyes, hemioxonol dyes, styryl dyes, merocyanine dyes, cyanine dyes, azo dyes, and the like. Among them, oxonol dyes: hemioxonol dyes and merocyanine dyes are useful.

In the silver halide photographic light-sensitive material according to the present invention, when dyes, ultraviolet absorbers, etc. are included in the wood-philic colloid layer, they may be mordanted with a cationic polymer or the like.

Various compounds can be added to the above photographic emulsion in order to prevent a decrease in sensitivity and the occurrence of fog during the manufacturing process, storage or processing of the silver halide photographic light-sensitive material.

The silver halide photographic light-sensitive material of the present invention contains antifoggants, ultraviolet light inhibitors, antistatic agents, matting agents, surfactants, thickeners, plasticizers, hardeners, and coating aids that are commonly used in light-sensitive materials. Agents, emulsifiers, modifiers, antifoaming agents, matting agents, slipping agents, toning agents, and the like can be used.

In the manufacturing method of the present invention, the pH of the coating liquid is 5.3 to 7.
．． It is preferable that it is in the range of 5. For multi-layer coating,
It is preferable that the pH of the coating solution obtained by mixing the coating solutions of each layer in the ratio of coating amounts is in the above range of 5.3 to 7.5. If the pH is lower than 5.3, the hardening progresses slowly. A pH higher than 7.5 is often undesirable because it adversely affects photographic performance.

The photosensitive material of the present invention may further contain various additives depending on the purpose.

These additives are described in more detail in Research Disclosure Vol. 176 1 tem/7643 (1978, 1
February) and Volume 187 Item/8716 (197
(November 9).

In carrying out the silver halide photographic material of the present invention, for example, the emulsion layer and other layers can be constructed by coating on one or both sides of a flexible support commonly used in photographic materials. .

Useful flexible supports include films made of semi-synthetic or synthetic polymers such as cellulose nitrate, cellulose acetate, cellulose acetate butyrate, polyethylene, polyvinyl chloride, polyethylene terephthalate, polycarbonate, etc.
Examples include paper coated or laminated with a baryta layer or an α-olefin polymer (eg, polyethylene, polypropylene, ethylene/butene copolymer). Preferably, the paper is coated or laminated with a baryta layer or an α-olefin polymer (for example, polyethylene, polypropylene, ethylene/butene copolymer) on one or both sides. The support may be colored using dyes or pigments. It may be made black for the purpose of blocking light. The surface of these supports is generally treated with an undercoat to improve adhesion with emulsion layers and the like.

The surface of the support may be subjected to corona discharge, ultraviolet irradiation, flame treatment, etc. before or after the undercoating treatment.

In the silver halide photographic light-sensitive material according to the present invention, the photographic emulsion layer and other wood-philic colloid layers can be coated on the support or on other layers by various coating methods. For coating, a dip coating method, a roller coating method, a curtain coating method, an extrusion coating method, etc. can be used.

The photographic processing of the silver halide photographic material according to the present invention is as follows:
There are no particular restrictions, and various methods can be used. For example, research disclosure (Research Disclosure)
closure) No. 176 v2B-page 30 (RD17
Any of the various methods and various treatment liquids can be applied, such as those described in 643). The processing temperature is usually selected between 18°C and 50°C, but it may also be below 18°C or above 50°C.

As the developing agent, dihydroxybenzenes (e.g. hydroquinone), 3-pyrazolidones (e.g. 1-phenyl-3-pyrazolidone), aminophenols (e.g. N-methyl-〇-aminophenol), etc. are used alone or in combination. be able to.

Developing solutions generally contain various preservatives, alkaline agents, and p.
Contains H&I buffering agent, antifogging agent, etc., and may further contain solubilizing agent, color toning agent, development accelerator, surfactant, antifoaming agent, water softener, hardening agent, viscosity imparting agent, etc. as necessary. good.

As the fixer, one having a commonly used composition can be used. As the fixing agent, in addition to thiosulfates and thiocyanates, organic sulfur compounds known to be effective as fixing agents can be used. The fixer may contain a water-soluble aluminum salt as a hardening agent.

Exposure for the silver halide emulsion used in the present invention varies depending on the state of chemical sensitization, purpose of use, etc., but includes tungsten, fluorescent lamps, mercury lamps, arc lamps, xenon sunlight, xenon flash, cathode ray tube flying spot, laser light, Various types of light sources such as LED light sources and electron beams can be used as appropriate.

As for the exposure time, in addition to normal exposure of 1/1 (100 to 100 seconds), short-time exposure of 1/10' to 1/107 seconds can be applied with xenon flash, cathode ray tube, and laser light.

EXAMPLES Hereinafter, the present invention will be described in more detail with reference to examples of the present invention, but the present invention is not limited to these examples.

Example 1 (Preparation of antihalation layer coating solution) The dyes shown in Table 1 were added in the amounts shown in Table 1 to an aqueous gelatin solution, and the optical brightener emulsified dispersion (III-13) was added in the amounts shown in Table 1. Furthermore, bis(2-ethylhexyl) 2-sulfonate succinate was added as a coating aid.
An anti-halation layer coating solution was prepared by adding ester sodium salt and a styrene-maleic anhydride copolymer as a thickener.

(Preparation of optical brightener emulsified dispersion) Oil-soluble optical brightener I+-13) 8 g was mixed with 25 mu of talesyl diphenyl phosphate and 12 μl of 1-butanol.
The solution dissolved in mj2 was mixed with 260 tnll of a 5% gelatin aqueous solution containing 0.5 g of triisopropylnaphthalene sulfonic acid sodium salt, and an emulsified dispersion was prepared by ultrasonic dispersion.

(Adjustment of silver halide emulsion layer coating solution) ■ Formation process of silver halide grains Solution 1 ossein gelatin water Solution 2 AgNO water solution 3 Ag(I Br water solution 4 Br I water Ammonia water (28%) solution 5 3RhBr to 1%.

0g 400mj! 0g 250mJ! 8g 1g 150mJ! 2g 0.6g 200 m42 0mIt 1 rnll 25% KBr solution 1999ml 1 solution 6 0.5% to 2 [Ir (IV) Cj2a] solution
0.75 g water
36.75 mj2 2 ml of solution 5 (the amount of rhodium salt added is 4.2 At the same time, inject for 5 minutes, age for 10 minutes, then inject solution 4 for 1 minute,
After injecting solution 4, add 0.25 ml from solution 6 (
The amount of iridium salt added is 2.9 per mole of silver halide.
X 10-' mol) was taken and added.

After addition of solution 6 and aging for 20 minutes, acetic acid (20%) was added to adjust the pH to 5.7.

(2) Desalting step Next, Solution 7 below was added to this prepared solution and stirred for 5 minutes.

Solution 7 Agglomerated gelatin agent water
100 mj2 Thereafter, p)I was adjusted to 4.4 with acetic acid, gelatin was coagulated and sedimented, and the supernatant liquid was drained.

Next, add pure 3JZ and further add NaOH to adjust the pH to 4.
, 90 and stirred and dispersed. After that, pH was adjusted again with acetic acid.
was adjusted to 4.60 to flocculate and precipitate the gelatin, and the supernatant liquid was drained.

This operation was repeated to desalinate a total of 3 times, and then 100 mg of phenol and the following compound [a] were added as an anti-piping agent for 40 minutes.
mg was added, the pH was finally adjusted to 5.90, and emulsion A
I got it.

Compound [a] Br HOCH2CCH20)I NO□ ■ Preparation process of coating solution for silver halide emulsion layer Emulsion A thus obtained was kept at 59°C, and calcium chloride 27
Optimum chemical sensitization was carried out by adding 0 mg 1 mol Ag and further adding ammonium thiocyanate, chloroauric acid, and sodium thiosulfate.

Then stabilizer: 6-methyl-4 monohydroxy 1.3.3a 7-chitrazaindene 1.7g 1 mol^g
Sensitizing dye 2 As shown in Table 1, antifoggant: 1-phenyl-5 monomercaptotetrazole 60 + ng 1 mol Ag coating aid sodium nitriisopropylnaphthalene sulfonate 1 g/dryl Ag film property improver: polyethyl acrylate latex 60 g 8g of dihetylene glycol/20g of dihetylene glycol was added, and the optical brightener emulsified dispersion prepared above was added as shown in Table 1, and styrene-maleic anhydride was added as a thickener. Copolymer, 1 of tetrakis(vinylsulfonylmethyl)methane and taurine potassium salt as a hardening agent
:0.25mol reaction product per 1g of gelatin 30II
1 g was added, and the pH was adjusted to 5.5 with citric acid to prepare a coating solution for a silver halide emulsion layer.

(Adjustment of coating solution for protective layer) Add a matting agent to the gelatin binder with an average particle size of 3.
7011g/12 of 5μm polymethyl methacrylate
, 2-sulfonate succinic acid bis(2-
ethylhexyl) ester sodium salt 6mg/l1
12. The following compound (b) is used as a fluorine-containing surfactant.
4mg/m2. 1g of gelatin and formalin as a hardening agent
1 mg/m2 of 1-phenyl-5-mercaptotetrazole was added as an antifoggant to the coating, and the pH was adjusted to 5.5 with citric acid to prepare a coating solution for a protective layer.

Compound (b) (Coating) The thus prepared silver halide emulsion layer coating solution and protective layer coating solution were layered on a 110 μm thick polyethylene coated paper having a hydrophilic colloid backing layer and a gelatin undercoat layer. Coated.

Immediately before application (within 10 seconds), 1-phenyl-3-pyrazolidone (o per mole of silver, 7 g) and the following compound (i.
) was added to the coating solution for a silver halide emulsion layer.

Compound (i) HOCH2SO3Na (Exposure) The sample thus prepared was exposed to light for 10-6 seconds from a helium-neon ()Ie-Ne) laser light source through an optical wedge.

(Processing) After the above exposure, development was performed using a developer having the composition shown below, followed by fixing, washing with water, and drying. Automatic developing machine GR-2 is used for development.
6 (manufactured by Konica Corp.) was used. (Development temperature is 38℃
, development time is 20 seconds).

(Developer formulation) Pure water (ion exchange water) approximately 800a+IL
Potassium sulfite 60 g Ethylenediaminetetraacetic acid disodium salt 2 g Potassium hydroxide 10.5 g 5-Methylbenzotriazole 300 aJj Diethylene glycol 25 g 1-phenyl-4
4-dimethyl-3-pyrazolidone 300m11-
Phenyl-5-mercaptotetrazole 60al potassium bromide 3.5g hydroquinone 20g potassium carbonate
Add 15g of pure water (ion-exchanged water) and make it to 10100O. The pH of the developer was approximately 1008.

(Fixer formulation) (Composition A) Ammonium thiosulfate (72.5% W/V aqueous solution) 240
mA sodium sulfite 17g
Sodium acetate trihydrate 6.5g Boric acid 6g Sodium citrate dihydrate 2g Acetic acid (90%
W/W aqueous solution) 13.6 m, g (composition) Pure water (ion exchange water) 17IIlj
2 Sulfuric acid (50% w7'w aqueous solution) 4.
7 g aluminum sulfate (AAzOi equivalent content is 8.1
% W/W aqueous solution) When using a 26.5 g fixer, the above composition A1 was dissolved in 5 CIQ mjl of water in the order of composition, and finished to IIL. The pH of this fixer was about 4.3.

Sakura Digital Densitometer PDA measures the reflection density of the sample after processing.
-65 model (manufactured by Konica Corp.) to evaluate photographic properties.

The sensitivity was expressed as a relative sensitivity, taking the sensitivity of sample 1 as 100, which was also calculated by the reciprocal of the exposure amount required to obtain a blackening density of 1.0. Further, γ indicates the slope of the linear portion of the characteristic curve, and the larger γ is, the higher the contrast is.

In addition, the sharpness and white skin were visually evaluated on a 5-level sensory evaluation. A larger value indicates better results. The results obtained are shown in Table-1.

As is clear from Table 1, sample No. of the present invention.

It can be seen that samples 1 to 5 have high sensitivity, excellent sharpness, and excellent whiteness.

In contrast, sample N using comparative dyes (X) and (Y)
086.7 was inferior in whiteness, and comparative dye (A), (
It can be seen that even when applied to sample No. 8.9 using B), the residual color was inferior. Furthermore, samples that do not contain a fluorescent brightener, such as sample No. 10, have insufficient whiteness.

[Effects of the Invention] According to the present invention, by combining -Equation [1] to -Equation [■■], a paper with high sensitivity, excellent sharpness, and excellent whiteness can be obtained.

8 petitioner Koni

Claims (1)

[Scope of Claims] A silver halide photographic light-sensitive material having photographic constituent layers including at least a silver halide emulsion layer on a paper support coated with a resin on both sides, at least one of the photographic constituent layers having a general It contains at least one sensitizing dye represented by the formula [I] and at least one oil-soluble optical brightener represented by the general formula [III], and further contains the silver halide emulsion layer and the support. A silver halide photographic material, characterized in that a layer containing a dye represented by formula [II] is provided between the layers. General formula [II] ▲There are mathematical formulas, chemical formulas, tables, etc.▼ [In the formula, R_1 and R_2 represent a sulfonic acid group, a carboxylic acid group, or a substituted or unsubstituted lower alkyl group,
3, R_4 each represents an alkyl group, an aryl group, or a heterocyclic group having at least one sulfonic acid group or carboxylic acid group. ]