JPH08227115A - Manufacture of silver halide photographic emulsion and silver halide photographic sensitive material using this material - Google Patents

Abstract

PURPOSE: To provide the manufacturing method of the silver halide emulsion freed of nonuniformity of silver halide crystal grains and enhanced in the efficiency of spectral or chemical sensitization and the photographic sensitive material using this emulsion. CONSTITUTION: The silver halide photographic emulsion is prepared by forming fine silver halide grains in a mixing vessel (B) installed separately from a reaction vessel (A) for forming the nuclei of silver halide grains and/or growth of their crystals, and all the emulsion prepared in the vessel (B) is freed of unnecessary ions contained in the emulsion, and fed into the reaction vessel (A), or the emulsion freed of the unnecessary ions is stored in an intermediate vessel (C) other than (A) and (B), and then, fed into the vessel (A).

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing a silver halide photographic emulsion, and more specifically, it relates to a method for eliminating silver halide grain crystals to improve the spectral sensitization and chemical sensitization efficiency. And a silver halide photographic light-sensitive material using the same.

[0002]

2. Description of the Related Art Conventionally, in a method for producing a silver halide photographic emulsion, a silver halide aqueous solution and a halogen salt aqueous solution are reacted in a reaction vessel to form silver halide grains, and then excess silver remaining in the system is removed. Halides such as potassium ion,
A silver halide photographic emulsion is obtained by removing unnecessary substances such as sodium ions, nitrate ions and ammonia by washing with water.

When the salt concentration in the reaction vessel is high, the silver halide grains are dissolved, resulting in non-uniformity in particle size and composition, and monodisperse grains cannot be obtained. Since the adsorptivity or affinity to the surface of silver particles is hindered, the efficiency of, for example, a spectral sensitizing dye, a sensitizer, a stabilizer, etc. is significantly deteriorated. Further, if the salt concentration is high, it may be necessary to remove it because it may impair the drying property and storability of the photosensitive material.

In addition, in the method of adding an aqueous solution of a halogen salt in the above-mentioned production method, ions are localized in the vicinity of the injection port of the aqueous solution, and as a result, the grain size or composition of silver halide grains produced is nonuniform. There was a flaw.

As a method for eliminating such non-uniformity of the grains, a method of supplying silver halide fine particles and silver halide salts in the form of fine silver halide particles without supplying them in an aqueous solution has recently been disclosed, for example, in Japanese Patent Laid-Open No. 1-1.
83417, 1-183654, WO89 / 06.
No. 83, No. 89/06831 and the like.

However, even in these methods of supplying fine particles, it is desirable to desalt and remove the above-mentioned unwanted substances in the system after the particles are formed, as in the conventional method.

Regarding the method for desalting a silver halide emulsion, for example, JP-A-2-172816 and JP-A-2-172817 are disclosed. Each of these techniques is a method of desalting the fine grain silver halide emulsion during the addition to the reaction vessel, or a method of desalting the fine grain silver halide emulsion and the emulsion in the reaction vessel during the addition.

However, in the method described in the above-mentioned patent, in the mixing container provided separately from the reaction container, since the fine grain emulsion is not desalted, the grains change over time and the fine grain emulsion solution is stored. However, it was necessary to limit the manufacturing schedule. In particular, JP-A 2-17
In No. 2817, since the supply liquid from the mixer and the liquid extracted from the reaction container are mixed between the mixer and the reaction container, desalination or the liquid extracted from the reaction container is desalted, so that the desalting property is The desalting method was not preferable because it was not sufficient and residual unnecessary ions were observed.

[0009]

SUMMARY OF THE INVENTION Therefore, the first object of the present invention is to dissolve silver grains caused by a high salt concentration in a reaction vessel, and the resulting silver halide having no unevenness in grain size and halogen composition. It is to provide a method for producing a silver halide photographic emulsion in which grains are grown.

A second object of the present invention is to provide a method for producing a silver halide photographic emulsion with improved efficiency of spectral sensitization or chemical sensitization.

A third object of the present invention is to provide a silver halide photographic light-sensitive material containing such a silver halide emulsion.

[0012]

The object of the present invention has been achieved by the following method.

(1) A fine grain silver halide emulsion formed in a reaction vessel (A) for nucleating and / or growing crystals of silver halide grains in a mixing vessel (B) provided separately from the reaction vessel. In the method for producing a silver halide photographic emulsion to be supplied, unnecessary ions contained in the fine grain silver halide emulsion in the mixing container (B) are removed from all the fine grain silver halide emulsion, and then the unnecessary ions are removed. A method for producing a silver halide photographic emulsion, which comprises supplying the removed fine grain silver halide emulsion to the reaction vessel (A).

(2) A fine grain silver halide emulsion formed in a reaction vessel (A) for causing nucleation and / or crystal growth of silver halide grains in a mixing vessel (B) provided separately from the reaction vessel. In the method for producing a silver halide photographic emulsion to be supplied, after removing unnecessary ions contained in the fine grain silver halide emulsion, the fine grain silver halide emulsion is separated from the reaction vessel (A) and the mixing vessel (B). The method for producing a silver halide photographic emulsion, characterized in that the fine grain silver halide emulsion from which the unnecessary ions have been removed is supplied to the reaction vessel (A) and then stored in the retention vessel (C).

(3) A fine grain silver halide emulsion formed in a reaction vessel (A) for causing nucleation and / or crystal growth of silver halide grains in a mixing vessel (B) provided separately from the reaction vessel. In the method for producing a silver halide photographic emulsion to be supplied, unnecessary ions contained in the fine grain silver halide emulsion in the mixing container (B) are removed from all the fine grain silver halide emulsion, and then the unnecessary ions are removed. The removed fine grain silver halide emulsion is stored in a retention vessel (C) different from the reaction vessel (A) and the mixing vessel (B), and then the fine grain silver halide emulsion is supplied to the reaction vessel (A). A method for producing a silver halide photographic emulsion, which is characterized in that

(4) The silver halide emulsion is fed to the reaction vessel (A) after desalting to a salt concentration of 10% or less immediately after the production of the fine grain silver halide emulsion. ) To (3), the method for producing a silver halide photographic emulsion according to any one of items.

(5) A silver halide photographic light-sensitive material having at least one silver halide photographic emulsion layer on a support, wherein the silver halide photographic emulsion layer contains the above-mentioned (1) to
A silver halide photographic light-sensitive material containing the silver halide photographic emulsion as described in any one of (4).

The present invention will be described in detail below.

In the present invention, the fine grain silver halide emulsion formed in the mixing vessel (B) refers to fine grain silver halide fine grains having an average grain size of 0.05 μm or less prepared in advance.
The fine grain silver halide emulsion may have any halogen composition, but silver iodide, silver bromide or silver iodobromide grains are preferred.

In the present invention, as a method for removing unnecessary ions contained in the fine grain silver halide emulsion, any conventionally known desalting method may be used. For example, the silver halide emulsion cooled and set may be finely divided or noodles. Japanese Patent Application Laid-Open Nos. 47-4448 and 49-462, which are cut into pieces and washed with water
55 or the like, or an ultrafiltration method using a semipermeable membrane, for example, JP-A-57-209823 and 59-59.
-43727, 62-113137, JP-A-2-
172816, 2-172817, 3-140
Application of ion exchange, such as Japanese Patent No. 946, for example, JP-A-61
-219948, 62-23035, 63-4
No. 0137, No. 63-40039, JP-A-4-229.
No. 42, No. 6-63200, or Japanese Patent Publication No. 33-3
The electrodialysis method described in No. 474 may be used.

Among the above-mentioned methods, the desalting method by the ultrafiltration method and the electrodialysis method is particularly effective as the desalting method preferable in the present invention.

FIG. 3 shows a separation schematic diagram of the ultrafiltration method (UF), and FIG. 4 shows an explanatory view of the ultrafiltration apparatus. Here, the ultrafiltration method is a pressure filtration separation method through a semipermeable membrane,
According to this method, relatively small molecules such as inorganic substances, sugars and amino acids can permeate, but high molecular substances cannot permeate easily. As a result, unnecessary ions in the fine grain silver halide emulsion of the present invention are transmitted and desalted.

In FIG. 4, the emulsion 12 is circulated in the ultrafiltration module 14 having the ultrafiltration membrane shown in FIG. 3 by the circulation pump 13. Line 1 by pressure regulating valve 15
The pressure in 6 is adjusted to remove some of the water and water-soluble ions from the emulsion that has passed through the ultrafiltration module 14 through the permeate line 17. The state of ion removal was judged by monitoring the decrease in the conductivity of the emulsion.

As the electrodialysis method, FIG. 1 shows a conceptual diagram of the dialysis method, and FIG. 2 shows an illustration of a desalting apparatus by the electrodialysis method.

In FIG. 2, the salt content in the aqueous solution is ionized into cations (eg K ⁺ ) and anions (eg NO ₃ ). The K membrane is a cation exchange membrane that allows only anions to pass through, and A is an anion exchange membrane that allows only anions to pass through. The cathode (-) is on the outside of the K film, and the anode (+) is on the outside of the A film.
Then, when a direct current is applied, cations in the solution are drawn to the cathode and go to the cathode through the K film, and anions are drawn to the anode and go to the anode through the A film. In addition, cations performed on the anode side and anions performed on the cathode side are film A and K, respectively.
The ions that cannot pass through the membrane and thus once pass through the exchange membrane cannot be returned to the original solution and are desalted.

In the present invention, gelatin is usually used as the protective colloid for the fine grain silver halide emulsion, and specifically, Research Disclosure (RD) No. 1
Those described in paragraph IX of 7643 (December 1978) can be used.

In the present invention, desalting the salt concentration of the fine grain silver halide emulsion to 10% or less with respect to the value immediately after production and then supplying it to the reaction vessel means, for example, desalting by electrodialysis. While monitoring the removal state of ions by the conductivity of the emulsion, 10% or less of the initial conductivity,
Preferably, the electrodialysis is stopped at the time when the amount becomes 5% or less to form a fine grain emulsion.

In the present invention, the silver halide grains to which the fine grain silver halide emulsion is supplied are not particularly limited, but silver halide grains such as silver bromide, silver iodobromide and silver chloroiodobromide are nucleated. And the seed particles thereof. Among these, seed particles may be desalted in advance.

The silver halide emulsion according to the present invention, which has finished crystal growth by the fine grain supply method, may be desalted in order to remove unnecessary ions.

The silver halide photographic emulsion obtained by the method of the present invention can be used in various silver halide photographic light-sensitive materials. That is, in a silver halide photographic light-sensitive material having at least one light-sensitive silver halide emulsion layer on one side or both sides of a support, the silver halide photographic emulsion obtained by the present invention is used in the silver halide emulsion layer. be able to. Examples of silver halide photographic light-sensitive materials that can be used include general black-and-white or color photographic light-sensitive materials, movie black-and-white or color photographic light-sensitive materials, and industrial X
It can be applied to a wide range of silver halide photographic light-sensitive materials such as line or printing photographic light-sensitive materials.

[0031]

EXAMPLES The present invention will be described in more detail below with reference to examples.

Example 1 <Preparation of seed emulsion TEM-1> 2w at a temperature of 40 ° C
A 4% silver nitrate aqueous solution and a 4N potassium bromide aqueous solution were mixed with a t% gelatin aqueous solution by a control double jet method to prepare a silver halide emulsion having an average particle size of 0.3 μm, and desalting was performed by the electrodialysis method shown in FIG. Seed emulsion TEM-
Got 1.

<Preparation of Fine Particle Emulsion B-1 of the Present Invention> A 5 wt% gelatin aqueous solution having a temperature of 30 ° C. was mixed with a 3.5 N silver nitrate aqueous solution and a 3.5 N potassium bromide aqueous solution by a control double jet method, and then halogenated. A silver halide fine grain emulsion B-0 was prepared. As a result of observation with an electron microscope, the particles were monodisperse particles having an average particle size of 0.05 μm and a coefficient of variation of 10%.

The resulting fine grain emulsion B-0 was desalted by the electrodialysis method shown in FIG. The following solutions were used for desalting.

(A) Silver Halide Fine Particle Emulsion B-0 1000 cc (B) 0.05 NKNO ₃ Aqueous Solution (C) 0.3 NKNO ₃ Aqueous Solution The electrodialysis apparatus used in the examples will be described with reference to FIG. Figure 2
In the above, the cation exchange membrane 1 and the anion exchange membrane 2 are alternately installed, and divided into an emulsion chamber 3 for circulating the emulsion, a salt waste liquid chamber 4 for holding the removed salt, and an electrode chamber 5, and electrodes are arranged on both sides. .

The solution (A) was placed in the emulsion chamber 3, the solution (B) was placed in the salt waste solution chamber 4, and the solution (C) was placed in the electrode chamber 5.
Circulate while keeping at ℃. A direct current is applied to move the ions in the emulsion to the salt waste liquid chamber through the ion exchange membrane to remove unnecessary ions. The state of ion removal was judged by monitoring the decrease in the conductivity of the emulsion. The electrodialysis was stopped at the time when the electric conductivity became 5% or less of the initial electric conductivity to obtain the fine grain emulsion B-1 according to the present invention.

<Preparation of Growth Emulsion EM-1 of the Present Invention> Next, the above-described fine grain emulsion B-1 was added to a silver halide ripening vessel in which seed emulsion TEM-1 was previously placed. The ripening vessel was stirred with a propeller blade and ripened with a seed emulsion to obtain a silver bromide emulsion EM-1 according to the present invention having an average grain size of 0.8 μm.
The conductivity of EM-1 was 2 mS / cm.

<Preparation of seed emulsion TEM-2> Temperature is 40 ° C.
4N silver nitrate aqueous solution and 4N potassium bromide aqueous solution were mixed with the 2.5 wt% gelatin aqueous solution described in 1. by a control double jet method to prepare a silver halide seed emulsion having an average particle size of 0.3 μm, and the silver halide seed emulsion was removed by an ultrafiltration method. Salt and TEM-2
I got

<Preparation of Fine Grain Emulsion B-2 of the Present Invention> The silver halide fine grain emulsion B-0 used in the preparation of the fine grain emulsion B-1 was desalted by an ultrafiltration method to obtain an initial conductivity. When it reached 5% or less, it was stopped to obtain the fine grain emulsion B-2 of the invention. The ultrafiltration method is described above with reference to FIG.

<Preparation of Growth Emulsion EM-2 of the Present Invention> The above-mentioned fine grain emulsion B-2 was added to a silver halide ripening vessel containing a seed emulsion TEM-2 in advance. Stir the aging container with a propeller blade and ripen the seed emulsion to obtain an average particle size of 0.8.
A silver bromide emulsion EM-2 according to the present invention having a size of μm was obtained.

<Preparation of Comparative Emulsion EM-0> Above EM-
A comparative emulsion EM-0 was prepared using the same seed emulsion TEM-1 as in Example 1 and the fine grain emulsion B-0 which was not desalted by the electrodialysis method. The ripening vessel was stirred with a propeller blade and ripened with a seed emulsion to obtain a silver bromide emulsion having an average grain size of 0.8 μm. The obtained emulsion was desalted by electrodialysis to an electric conductivity of the same value as that of EM-1 above, to obtain comparative emulsion EM-0.

Obtained Emulsions EM-1, EM-2 and EM
Anhydro-5,5'-dichloro-9-ethyl-3,3'-di- (4-sulfobutyl) -thiacarbocyanine as a spectral sensitizing dye was prepared at 55 ° C after -0 was chemically ripened. 15 sodium salt per mole of silver halide
0 mg was added, and then appropriate amounts of ammonium thiocyanate salt, chloroauric acid and sodium thiosulfate were added as chemical sensitizers. Then, after chemical aging for maximum sensitivity, 4-hydroxy-6-methyl-
An appropriate amount of 1,3,3a, 7-tetrazaindene was added.

The following additives were added to 1 mol of silver in the emulsion thus prepared to prepare a coating solution.

Styrene-maleic anhydride copolymer 800 mg 2-Mercaptobenzimidazole-5-sodium sulfonate 0.5 mg A coating solution containing the following per liter was prepared as a protective layer.

Gelatin 68 g 2,4-Dichloro-6-hydroxy-1,3,5-triazine sodium salt (2% aqueous solution) 12 ml Formalun (35% solution) 2 ml Glyoxal (40% solution) 2 ml Prepared as above The coating liquids for the emulsion layer and the protective layer were coated simultaneously on one surface of the polyethylene terephthalate base which had been undercoated. The amount of silver attached to the emulsion layer was ² g per m ^{2, the} amount of gelatin attached was 1.8 g, and the amount of gelatin attached to the emulsion protective layer was 0.8 g.

<Sensitometry> The obtained sample was DG
Automatic development machine SR after wedge exposure using a tungsten tube with a color temperature of 5000 ° K that has passed through the filter as a light source
X-503, developer XD-SR, and fixer XF-SR {all (manufactured by Konica Corp.)} were treated at 35 ° C. for 30 seconds.
After the treatment, the sensitivity was obtained from the reciprocal of the exposure energy required to obtain the density of fog +0.1, and the sample No. Table 1 shows the relative sensitivity when the sensitivity of 1 is 100. Further, gamma is the gradient in the straight line portion of the characteristic curve.

[0047]

[Table 1]

As is clear from Table 1, the sample according to the present invention has lower fog, higher sensitivity, and higher gamma than the comparative sample.

Example 2 An emulsion was prepared in the same manner as the fine grain emulsion B-1 of Example 1, and electrodialysis was performed in the same manner. However, the electrodialysis was stopped when the electric conductivity reached 50%, 15%, 10% and 8% of the initial electric conductivity, and the fine grain emulsions B-3 and B- were respectively prepared.
4, B-5 and B-6 were obtained. Further, it was prepared in the same manner as in B-2 and ultrafiltered by the same method to obtain 50% of the initial conductivity, 15
%, 10%, and 8%, the ultrafiltration was stopped to obtain fine grain emulsions B-7, B-8, B-9, and B-10, respectively.

<Comparative Test> The obtained fine grain emulsion B-3,
B-4, B-5, B-6 and the undesalted fine grain emulsion B-0 and the desalted fine grain emulsion B-1 used in Example 1 were allowed to stand for 5 hours at a temperature of 35 ° C. under the same conditions, respectively, and halogen The variation with time of the grain size of the silver halide grains was traced.

Similarly, B-0, B-2, B-7, B-8,
With respect to B-9 and B-10, the temporal change in particle size was also tracked.

The obtained results are shown in FIGS. 5 and 6. Figure 5
As is clear from FIG. 6, whichever desalting method is used, the emulsion having a higher salt removal rate (for example, B-1) has a smaller change in grain size (vertical axis) with respect to the stagnation time (horizontal axis) and is stable. I understand that. (See FIGS. 5 and 6) Example 3 Fine grain emulsions B-3, B-4 and B- obtained in Example 2.
5, B-6, B-7, B-8, B-9 and B-10 were used to grow grains in the same manner as in EM-1 of Example 1 and emulsions EM-3 and EM- were not desalted. 4, EM-5, EM-6, E
M-7, EM-8, EM-9 and EM-10 were obtained.

Then, together with EM-1 prepared in Example 1, anhydro-5,5'-diphenyl-9-ethyl-3,3'-di- (3-sulfopropyl) -oxacarbocyanine hydroxy was used as a spectral sensitizing dye. 200 mg per mol of silver halide was added, and the mixture was stirred at a temperature of 50 ° C. for 30 minutes for sufficient adsorption and then centrifuged to estimate the amount of dye adsorbed on the silver halide grains.

The results obtained are shown in Table 2 below. However, the dye adsorption amount in the table is a relative value when the adsorption amount of the emulsion EM-1 is 1.

[0055]

[Table 2]

What can be said from the amount of dye adsorbed in Table 2 above is that if the electrical conductivity of the fine grain emulsion is desalted to at least 10% of the initial electrical conductivity, it is necessary for spectral sensitization without a desalting step after growth. It is possible to obtain adsorption of dyes. It can be seen that the spectral sensitization efficiency can be further improved by desalting to 5% of the initial conductivity.

[0057]

According to the first aspect of the present invention, all unnecessary ions contained in the fine grain silver halide emulsion in the mixing vessel (B) are removed and then added to the reaction vessel (A). In addition, unnecessary by-products are not generated in the emulsion during grain growth in the reaction vessel. Therefore, the desalting step after growth can be omitted, and the manufacturing cost can be reduced.

According to the second aspect of the present invention, unnecessary ions contained in the fine grain silver halide emulsion are removed and then stored in another container (C) and then in the reaction container (A).
Since fine grains can be mixed and added as required, and fine grain silver halide emulsion can be stored, which is advantageous from the viewpoint of control in the production process.

According to the third aspect of the present invention, all unnecessary ions contained in the fine grain silver halide emulsion in the mixing container (B) are removed, and then stored in another container (C). Since it is added to the reaction vessel (A) from the above, unnecessary by-products are not generated during the growth of particles in the reaction vessel, and fine particles can be mixed and added as needed. That is, in the conventional method for supplying fine particles, since the fine particles change with time, it is necessary to add them to the reaction vessel for growing the particles immediately after the production of the fine particles, and the degree of freedom in the manufacturing process was small. For example, the production of fine particles can be performed independently of the growth of particles. Further, in the case of producing particles having a mixed composition by the conventional fine particle supply method, it is necessary to produce fine particles having the same composition as the growth composition during the production of fine particles. It was necessary to manufacture fine particles with
According to the present invention, fine particles having a uniform composition can be produced and stored, and the fine particles can be mixed and added at an appropriate ratio, so that the degree of freedom in production can be increased. Further, in the conventional fine particle supply method, when there is a large difference in the production amount, an apparatus capable of handling it was required, but in the present invention, a certain amount of fine particles can be produced and stored, and an amount as needed can be used. .

According to the fourth aspect of the present invention, since the salt concentration of the fine grain silver halide emulsion is desalted to 10% or less immediately after the production, the silver halide emulsion is supplied to the reaction vessel (A). It is possible to eliminate the non-uniformity of the shape of silver halide grains and to improve the efficiency of spectral sensitization and chemical sensitization.

According to the invention of claim 5, a silver halide photographic light-sensitive material having a high sensitivity can be obtained by using the silver halide photographic light-sensitive material containing the silver halide emulsion produced by the above production method. .

[Brief description of drawings]

FIG. 1 is an explanatory diagram of a desalination apparatus by electrodialysis.

FIG. 2 is an explanatory diagram of an electrodialysis device used in Examples.

[Fig. 3] Schematic diagram of separation by ultrafiltration method

FIG. 4 is an explanatory diagram of an ultrafiltration electrodialysis device used in Examples.

FIG. 5 is a graph showing variation with time of particle diameter in Example 2.

FIG. 6 is a graph showing the variation with time of the particle size of Example 2.

[Explanation of symbols]

 1 Cation Exchange Membrane 2 Anion Exchange Membrane 3 Emulsion Chamber 4 Salt Waste Liquid Chamber 5 Electrode Chamber 6 Cathode 7 Anode 8 Outer Frame 9 Emulsion 10 Salt Waste Liquid 11 Electrode Liquid C Circulation 12 Emulsion 13 Circulation Pump 14 Ultrafiltration Module 15 Pressure Control Valve 16 Circulation line 17 Permeate line

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Kazuyoshi Ichikawa Konica Stock Company, 1 Sakura-cho, Hino-shi, Tokyo In-house

Claims (5)

[Claims] 1. A fine grain silver halide emulsion formed in a mixing vessel (B) provided separately from the reaction vessel is supplied to a reaction vessel (A) for causing nucleation and / or crystal growth of silver halide grains. In the method for producing a silver halide photographic emulsion, the unnecessary ions contained in the fine grain silver halide emulsion in the mixing container (B) are removed from all the fine grain silver halide emulsion, and then the unnecessary ions are removed. A method for producing a silver halide photographic emulsion, which comprises supplying the fine grained silver halide emulsion described above to the reaction vessel (A). 2. A fine grain silver halide emulsion formed by a mixing vessel (B) provided separately from the reaction vessel is supplied to the reaction vessel (A) which causes nucleation and / or crystal growth of silver halide grains. In the method for producing a silver halide photographic emulsion described above, after removing unnecessary ions contained in the fine grain silver halide emulsion, the fine grain silver halide emulsion is separated from the reaction vessel (A) and the mixing vessel (B). A method for producing a silver halide photographic emulsion, which comprises storing in a retention vessel (C) and then supplying the fine grain silver halide emulsion from which the unnecessary ions have been removed to the reaction vessel (A). 3. A fine grain silver halide emulsion formed by a mixing vessel (B) provided separately from the reaction vessel is supplied to the reaction vessel (A) for causing nucleation and / or crystal growth of silver halide grains. In the method for producing a silver halide photographic emulsion, the unnecessary ions contained in the fine grain silver halide emulsion in the mixing container (B) are removed from all the fine grain silver halide emulsion, and then the unnecessary ions are removed. The fine grained silver halide emulsion is stored in a retention vessel (C) different from the reaction vessel (A) and the mixing vessel (B), and then the fine grain silver halide emulsion is supplied to the reaction vessel (A). A method for producing a silver halide photographic emulsion, characterized by: 4. The silver halide emulsion is supplied to the reaction vessel (A) after desalting the salt concentration of the fine grain silver halide emulsion to 10% or less immediately after production. 4. The method for producing a silver halide photographic emulsion as described in any one of 3 above. 5. A silver halide photographic light-sensitive material having at least one silver halide photographic emulsion layer on a support, wherein the silver halide photographic emulsion layer contains the silver halide photographic emulsion layer according to any one of claims 1 to 4. A silver halide photographic light-sensitive material comprising the described silver halide photographic emulsion.