JPH0444031A - Silver halide photographic sensitive material - Google Patents

Abstract

PURPOSE:To improve whiteness without degrading sensitivity and to have high sharpness by adding a dye of the amt. to attain half the sensitivity to hydrophilic colloidal layers. CONSTITUTION:The hydrophilic colloidal layers are provided between silver halide emulsion layers and a base. The dye of the amt. to attain half the sensitivity is added to the hydrophilic colloidal layers. While the amt. of the dye to be added to the hydrophilic colloidal layers varies, the preferable amt. of the addition is 500 to 10mg/m<2>. The dye used in this embodiment can enhance the sharpness with the small amt. and is less degraded in the sensitivity and, therefore, the higher sensitivity is obtd. with the smaller amt. of a sensitizing dye in the case of enhancing the sensitivity with the sensitizing dyestuff. Then, the whiteness is improved as well. High sharpness is obtd. and the whiteness is improved when the dye is added to the hydrophilic colloidal layers in the amt. to attain half the sensitivity.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a silver halide photographic light-sensitive material, and more particularly to a photographic paper (simply referred to as "silver halide") having excellent whiteness and sharpness. Beno<-tomoshi)u. ) and other 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, in order to improve sharpness, photographic paper has been manufactured by providing a silver halide emulsion layer on a paper support. 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 recent years, even higher sharpness has been required to improve quality. Therefore, if the amount of 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 sharpness without a decrease in sensitivity, the present inventors discovered that when a dye was added to the antihalation layer in an amount that would reduce the sensitivity to 1/2, the sharpness improved dramatically and the fluorescence He discovered that the deterioration of white melon could be suppressed by adding a whitening agent, and thus completed the invention of wood.

[Object of the Invention] Therefore, the object of the present invention is to provide a silver halide photographic material such as paper which has excellent whiteness without reducing sensitivity and has high sharpness.

[Structure of the Invention] The above-mentioned objects of the present invention are as follows: 1) A silver halide photographic light-sensitive material having a photographic constituent layer including a silver halide emulsion layer on a paper support coated with a resin on both sides. A halogenated method, characterized in that a lignophilic colloid layer is provided between the emulsion layer and the support, and a dye is added to the hydrophilic colloid layer in an amount that reduces sensitivity to 1/2. Silver photosensitive material.

2) Each of these is achieved by a silver halide photographic light-sensitive material characterized in that the photographic constituent layer described in item 1 contains a fluorescent brightener.

The present invention will be explained in more detail below.

In the present invention, examples of the dye added to the hydrophilic colloid layer in an amount that reduces the sensitivity by half include the following.

The following margins (I-2) (I-7) ([-10) (I The amount of dye added to the hydrophilic colloid layer varies depending on the dye, so it is not possible to say generally, but the preferred amount is is 500 mg/m2 to 10 mg/m2.

The dye used in the present invention can improve sharpness with a small amount and has little deterioration in sensitivity. The whiteness is therefore also improved.

The silver halide photographic light-sensitive material used in the present invention is preferably a light-sensitive material in which the silver halide grains in the silver halide emulsion have maximum absorption at 600 nm or more, and the amount of the sensitizing dye in the silver halide emulsion. is 10 mg 1 mol Ag ~ 3
00 mg 1 mol Ag.

Furthermore, by adding an optical brightener, the whiteness is further improved.

The optical brightener is contained in at least one layer of the photographic constituent layer including the hydrophilic colloid layer on the support, and the optical brightener has the following general formula (Il-a), (II=b )
, [■-C], and (II-d) can be preferably used.

[■-a]

(n-b) (II-c) Margin below (II-d) Not limited to these.

(Left space below) General formulas (n-a), (1-b), (If-cal, (n
-d), Yl and Y2 represent an alkyl group. Z
l and Z2 do not represent a hydrogen atom or an alkyl group. n is 1 or 2. RII R2, R4 and R5 represent an aryl group, an alkylaryloxy group, a hydroxy group, an amino group, a cyano group, a carboxyl crystal, an amide group, an ester group, an alkylcarbonyl group, an alkylsulfo group or a dialkylsulfonyl group, or a hydrogen atom. figure.

R6 and R7 represent a hydrogen atom or an alkyl group (methyl group, ethyl group, etc.).

R16 represents a phenyl group, a halogen atom, an alkyl-substituted phenyl group, an amino group or an organic-grade or secondary amine.

Next, general formulas (11-a), (II-b), (II-c)
Specific examples of the compounds represented by (1m-d) are given below. 1] (If-4) (If-5) (II-2) C11.

(II-6) C11.

[■ 3] (II-73 [■ 8] (n-9) (II-10) (n-15) [■ [■ 17] (II-11) [■ (It-13) (II-14) [■ 18] (II-19) (n-20) [■ 21] (n-22) (II-26) (■-23) (Hereafter the margins) (n-24) (II-25) The above fluorescence increase The amount of whitening agent used is preferably 1 mg/rrr to 200 mg/bo, more preferably 5 mg/rrr to 200 mg/rrr in the finished photographic paper.
It is in the range of B/rrf to 50 mg/rrf.

The above-mentioned exemplary optical brighteners may be used alone or in combination of two or more. Further, fluorescent brighteners other than the above-mentioned fluorescent brighteners can 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 layer among the photographic constituent layers including the antihalation layer on the support, 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 a solvent together with a low boiling point solvent if necessary, mix it with an aqueous geladine solution containing a surfactant, and then 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
A vine with a diameter of 0μ, preferably 0.1 to 20μ is used.

The silver halide emulsion may have any grain size distribution. An emulsion with a wide grain size distribution (referred to as a polydisperse emulsion) may be used, 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 10-8 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 prjmitive 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 sulfur sensitizers, 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 prepared 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, fuchtrazaindene, 5-mercabut-1-phenyltetrazole, 2-mercabutobenzothiazole, and the like.

As the hydrophilic colloid that can be used in the silver halide emulsion layer and intermediate layer used in the present invention, it is advantageous to use gelatin, but other hydrophilic colloids can also be used alone or together with gelatin. .

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 on 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;
11 derivatives such as starch derivatives; polyvinyl alcohol,
There are a wide variety of synthetic hydrophilic polymeric materials such as single or copolymers of polyvinyl alcohol partial acetal, poly-N-vinylpyrrolidone, polyacrylic acid, polymethacrylic acid, polyacrylamide, polyvinylimidazole, polyvinylpyrazole, and the like.

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. Approximately 1.0% of sensitizing dye per mole of silver halide. OX 10-5 to about 5 X 10-
'moles are preferred, particularly at concentrations of about 4.times.10@-5 to 2.times.10@-4 moles of sensitizing dye per mole of silver octaride.

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

The silver halide photographic material of the present invention may contain a color coupler, for example, at least one of a cyan coupler, a magenta coupler, and a yellow coupler, if necessary.

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 material according to the present invention, when dyes, ultraviolet absorbers, etc. are included in the hydrophilic 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 pl (pl) of the coating liquid is 5.3 to
A range of 7.5 is preferred. In the case of multilayer coating, it is preferable that the p)I of the coating liquid obtained by mixing the coating liquids for each layer in the ratio of coating amounts is in the above range of 5.3 to 7.5. If the pH is less than 5.3, the progress of hardening will be slow, which is undesirable, and if the pH is greater than 7.5, it will often have an adverse effect on photographic performance, which is undesirable.

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 Item/7643 (December 1978) and Research Disclosure Vol. 187 Item/8716 (December 1978).
(November 1979).

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 hydrophilic 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:
Various methods may be used without particular limitation. For example, research disclosure (Research Disclosure)
closure) No. 176, pages 28-30 (RD-1
Any of the various methods and various treatment liquids can be applied, such as those described in US Pat. No. 7,643. The processing temperature is usually chosen between 18°C and 50°C, but 18°C
Lower temperatures or temperatures above 50°C may also be used.

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.
It contains buffering agents, anti-fogging agents, etc., and may also contain melting aids, color toning agents, development accelerators, surfactants, antifoaming agents, water softeners, hardening agents, viscosity imparting agents, 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 exposure of 1/10' to 1/10' second can be applied for 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 coating solution for antihalation layer) The dyes listed in Table 1 were added to an aqueous gelatin solution in the amounts listed in Table 1, and a fluorescent brightener emulsion dispersion (II-
13) was added in an amount of 15 mg/m2 (excluding sample No. 13), and 2-sulfonate succinic acid bis(2-ethylhexyl) ester sodium salt was added as a coating aid, and styrene was added as a thickener. A maleic anhydride copolymer was added to prepare an antihalation layer coating solution.

(Preparation of optical brightener emulsion dispersion) A solution of 0.8 g of oil-soluble optical brightener (III-13) in 25 mu of talesyl diphenyl phosphate and 12 mft of 1-butanol was prepared as triisopropylnaphthalene sulfonic acid sodium salt. was mixed with a 5% gelatin aqueous solution containing 0.5 g at 260 mA, and an emulsified dispersion was prepared by ultrasonic dispersion.

(Preparation of coating solution for silver halide emulsion layer) ■ Formation process of silver halide grains Solution 1 Add ossein gelatin aqueous solution overnight 2 gNO3 aqueous solution 3 gCJZ Br aqueous solution 4 Br I water Aqueous ammonia (28%) Solution 5 Add 3RhBra to 1% 0 g 400++1 0g 50mjL 8g 1g 50ml 2g 0.6g 200 n+It 40a+It 1 I111 25% KBr solution 1999mu solution 6 2 [Ir (IV) Cf1. a ] liquid
0.75 g water
3 [i, 75 m℃ 62 ml of solution 5 or 62 ml (the amount of rhodium salt added is 4.2 Inject 3 at the same time for 5 minutes,
After aging for 10 minutes, solution 4 was injected over 1 minute, and after the injection of solution 4 was completed, 0.25 mf 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 (amino group substituted-CONH-fJ denaturation rate 90%) 1
2g water
100mJZ Then, adjust the pH to 4.4 with acetic acid.
The gelatin was flocculated and the supernatant liquid was drained.

Next, add pure 3℃ and further add NaOH to p114.
The temperature was adjusted to 90°, and the mixture was stirred and dispersed. Then again with acetic acid p)
I 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.
Finally, p)I was adjusted to 5.90 to obtain emulsion A.

Compound [a] r HOCI+2-C-CI (20H ■ Preparation process of coating solution for silver halide emulsion layer Emulsion A thus obtained was kept at 59°C,
Optimal chemical sensitization was carried out by adding 0 mg of 1 mol Ag, and adding ammonium thiocyanate, chloroauric acid, and sodium thiosulfate).

Then, Stabilizer: 6-methyl-4 -Hydroxy-1,3,3a.

7-tetrazaindene 1.7 g 1 mol Ag sensitizing dye: Antifoggant = 1-phenyl-5 1-mercaptotetrazole 60 mg 1 mol Ag coating aid nitriisopropylnaphthalene sodium sulfonate 1 g 1 mol Ag film property improver; poly Add ethyl acrylate latex sog 1 mol Ag, diethylene glycol 20 g 1 mol Ag, and further add the remainder of the optical brightener emulsified dispersion prepared above to a concentration of 15 mg/m2 (however, No. 13 is not added), Styrene-maleic anhydride copolymer as a thickener, tetrakis(vinylsulfonylmethyl)methane and taurine potassium salt as a hardening agent:
A 0.25 mol reaction product was added in an amount of 30 mg per 1 g of gelatin, and po 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.
70mg/m2 of 5μm polymethyl methacrylate,
6 mg/m2 of 2-sulfonate succinic acid bis(2-ethylhexyl) ester sodium salt as a coating aid;
14 m of the following compound (b) as a fluorine-containing surfactant
g/m2, 25 mg of formalin per 1 g of gelatin was added as a hardening agent, 1 mg/m2 of 1-phenyl-5-mercaptotetrazole was added as an antifoggant, and the pH was adjusted to 5.5 with citric acid. A coating solution for a protective layer was prepared.

Compound (b) (Coating) First, the compound (b) was coated in multiple layers on a 110 μm thick polyethylene coated paper having a hydrophilic colloid backing layer and an undercoat layer.

In addition, immediately before application (within 10 seconds), 1-phenyl-3-pyrazolidone (0.7 g per 1 mole of silver) and the following compound (i
) was added to the coating solution for a silver halide emulsion layer.

Compound (i) HOCtl 2 SO3N a (Exposure) The sample thus prepared was exposed to light for 10 −6 seconds from a helium neon (He—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-exchanged water) Approximately 800 mfl Potassium sulfite 60 g Ethylenediaminetetraacetic acid disodium salt 2 g Potassium hydroxide 10.535-Methylbenzotriazole 300 mJl Diethylene glycol 25 g 1-phenyl-4,4
-dimethyl-3-pyrazolidone 300mJ21
-Phenyl-5-mercaptotetrazole 60mu Potassium bromide 3.5g Hydroquinone 20g Potassium carbonate
15g pure water (ion exchange water)
Add to make it 100100O. developer pi
-1 was approximately 10.8.

(Fixer formulation) (Composition A) Ammonium diosulfate (72.5% W/V aqueous solution) 240
mj2 sodium sulfite 17
g Sodium acetate trihydrate 6.5 g Boric acid 6 g Sodium citrate dihydrate 2 g Acetic acid (90% W/W
*m liquid) 13.6 mal (composition) Pure water (ion exchange water) 17n+,
Il sulfuric acid (50% tv/w* solution) 4
．． 7 g aluminum sulfate (AJ2203 equivalent content is 8
．． 1% W/W aqueous solution) When using 26.5 g fixer, the above composition A,
They were melted in the order of composition, heated to 1°C, and used. The p++ of this fixer was about 4.3.

Measure the reflection density of the sample after treatment using Sakura Digital Densitometer Pr)
The photographic characteristics were evaluated by measurement using Model A-65 (manufactured by Konica Corporation).

The sensitivity was expressed as the reciprocal of the exposure amount required to obtain a blackening density of 1.0, and was expressed as a relative sensitivity, with the sensitivity of sample No. 1 being 100. Further, γ indicates the slope of the straight line portion of the characteristic curve.

Further, sharpness and white discoloration 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 the margin table-1 below, sample No. 1.2.3.
It can be seen that in Sample No. 4.5 of the present invention, the sensitivity was reduced by less than half due to the addition of the dye, but the sharpness was dramatically improved.

On the other hand, as in sample No. 1f, the amount of dye added was 100
If it exceeds mg/m2, the sharpness is good, but
It turns out that white melon is inferior.

In addition, samples containing no optical brightener, such as sample No. 12, have low white melon.

Example 2 ■ Silver halide grain preparation process solution-1 Water
3,4℃ Sodium chloride
7gHO(CH2Cl(20) (C1hCH2
CH20) (C1hC1hO) HO,5gm+n
=5.7 (Compound C) Gelatin 37g solution-2 Water compound C Sodium chloride Potassium bromide gelatin solution-3 Water compound C Sodium chloride Potassium bromide Hexachloroyl (0.01% aqueous solution) Potassium hexabromorodate salt (o , o 1% aqueous solution) Solution-4 Water Silver nitrate diate potassium salt 0.25j2 0.04g 2.18 2.7g o, 6g 1.3℃ 0.3g 27g 56g 3.5mρ 6mj+ 0.25I1 0g 0. 4mρ solution-5 water
Silver nitrate in 1.3
590g nitric acid 2
pH 3.0, p in 5ml solution-1 kept at 40℃
While maintaining Ag8.0, solution-2 and solution-4 were added simultaneously over 30 minutes, then solution-3 and solution-5 were added simultaneously and functionally over 50 minutes, and after the addition was completed, aqueous sodium carbonate solution was added. Adjust to pl+5.9, and add 670 mA+ of a 20% aqueous solution of magnesium sulfate and 0.8 p of a 5% aqueous solution of polynaphthalene sulfonic acid.

The emulsion thus obtained is flocculated at 40°C, then decanted and washed with water to remove excess salts from the aqueous solution.

Next, 7p of water was added to this to disperse it, and again 20%
Magnesium sulfate aqueous solution 330mA! and remove excess salt in the same way.

Further, 7 p of water is added for dispersion, and 230 m p of a 20% aqueous magnesium sulfate solution is added to remove excess salt in the aqueous solution. And 750mj! of water and 50 g of gelatin are added and dispersed at 55° C. for 30 minutes. Average particle size 0.
39 μm ■ Preparation process of coating solution for silver halide emulsion layer After heating the emulsion obtained as above to 60'C, citric acid 400 m
Optimal chemical sensitization was carried out by adding g, 38 mg of chloroauric acid, and 30 m8 of sodium thiosulfate.

Furthermore, 4-hydroxy-6-methyl-1,3,3a,7-
Add 9 g of tetrazaindene, 82 g of gelatin, and 400 mg of potassium bromide, and then add sensitizing dye 70 described in Example 1.
1 mol Ag was added.

Next, the same amounts of the antifoggant, coating aid, film property improver and diethylene glycol described in Example 1 are added, as well as the dyes shown in Table 2.

Furthermore, 30 m of the emulsion of the optical brightener used in Example 1 was added.
After adding a thickener and a hardening agent in the same manner as in Example 1, p)I was reduced to 5.5 g/m2 with citric acid.
A coating solution for emulsion was prepared.

(Coating liquid for protective film) The same as described in Example 1 is used.

(Coating), (exposure), and (processing) were performed in the same manner as in Example 1, except that the light source for exposure in Example 1 was changed to an LED light source, and the same evaluation as in Example 1 was performed.

The results are shown in Table-2.

As is clear from Table 2, even though the samples of the present invention have a two-layer structure, sample No. 15, 16, 19, and 20, in which dyes were added and the sensitivity was reduced to 1/2 or less, had poor sharpness. Excellent in
Moreover, it can be seen that the white melon does not fall off either.

Margin below [Effects of the Invention] The present invention provides high sharpness when a dye is added to the hydrophilic colloid layer in an amount that reduces the sensitivity to 1/2.
Moreover, it is possible to improve white melon.

By further adding an optical brightener, a -layer whiteness can be obtained.

Claims (1)

[Scope of Claims] 1) A silver halide photographic light-sensitive material having a photographic constituent layer including a silver halide emulsion layer on a paper support coated with a resin on both sides, the silver halide emulsion layer and the support. 1. A silver halide photographic light-sensitive material, characterized in that a hydrophilic colloid layer is provided between said hydrophilic colloid layer, and a dye is added to said hydrophilic colloid layer in an amount that reduces sensitivity to 1/2. 2) A silver halide photographic light-sensitive material, characterized in that the photographic constituent layer according to claim 1 contains a fluorescent brightener.