JPH0815815A - Silver halide photographic sensitive material - Google Patents

Abstract

PURPOSE:To provide the silver halide photographic sensitive material improved in conveyability in a facsimile plotter. CONSTITUTION:The photosensitive material is wound on the outer circumference of the writing drum of the facsimile plotter, and the drum is rotated in a speed of 500-2000rpm to execute a writing operation. The silver halide photographic sensitive material has at least one photosensitive silver halide emulsion layer on one side of a support and at least one backing layer on the other side and it is conditioned in humidity in a relative humidity of 80% at 23 deg.C for 2hr to obtain the photosensitive material having a kinetic friction coefficient of <=0.45 between the emulsion layer and the backing layer and a matting degree of the backing layer of 200-400mmHg.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a silver halide photographic light-sensitive material, and more particularly to a silver halide photographic light-sensitive material having improved transportability in a facsimile plotter or the like.

[0002]

2. Description of the Related Art In recent years, in newspaper production, printing factories have been decentralized for the purpose of speeding up publication. The facsimile plotter promoted this. Accordingly, the flow of publication is from the method of printing the manuscript created at the head office in letterpress to the method of printing the manuscript created on the computer of the head office to the distributed factories using the telephone line and writing it on the silver halide photographic light-sensitive material with the facsimile plotter. , It is changed to a method of exposing it closely to a PS plate and printing.

What is most required in newspaper production is the immediacy and promptness of news, and therefore promptness in production is required. Therefore, the writing time of the plotter and the processing time of the photograph have been shortened. Furthermore, in order to "publish at an hourly speed," it is required that there are no mistakes in the manuscripts, plotters, and jams in automatic machines. In particular, there is a problem that the silver halide photographic light-sensitive material often sticks and jams in the plotter when the humidity is high, and measures such as drying the inside of the plotter using a dryer are being studied. On the other hand, in the case of silver halide photographic light-sensitive materials, it is possible to improve by including a large amount of a matting agent on the surface of the light-sensitive material, but the transparency after development is significantly deteriorated, and the slipperiness is further deteriorated. There was a point.

[0004]

SUMMARY OF THE INVENTION In order to solve the above problems, an object of the present invention is to provide a silver halide photographic light-sensitive material having improved transportability in a facsimile plotter.

[0005]

SUMMARY OF THE INVENTION The above object of the present invention is to provide a method in which a photosensitive material is wound on the outer surface of a writing drum of a facsimile plotter and the drum is rotated at 500 rpm to 2000 rpm to perform writing. A silver halide photographic light-sensitive material having at least one light-sensitive silver halide emulsion layer on one side and at least one backing layer on the other layer side.
A silver halide photographic light-sensitive material characterized by having a dynamic friction coefficient of 0.45 or less between an emulsion layer and a backing layer after humidity conditioning at 80% RH for 2 hours and a matting degree of the backing layer of 200 mmHg to 400 mmHg. Wrap the photosensitive material inside the writing drum of the facsimile plotter and let the light from the light source reach 6000rp.
It is used for writing by rotating m ~ 30000 rpm,
A silver halide photographic light-sensitive material having at least one light-sensitive silver halide emulsion layer on one side of a support and at least one backing layer on the other layer side of the silver halide photographic light-sensitive material. The coefficient of dynamic friction between the emulsion layer and the backing layer is 0.45 or less after humidity conditioning at 80% RH for 2 hours,
Moreover, it has been found that the matting degree of the backing layer can be achieved by a silver halide photographic light-sensitive material characterized by having a matting degree of 640 mmHg to 720 mmHg.

The present invention will be specifically described below.

The coefficient of dynamic friction and the matting degree in the present invention can be measured by the following methods.

(Dynamic Friction Coefficient) The sample was conditioned at a temperature of 23 ° C. and 80% RH for 2 hours, and then the dynamic friction coefficient between the emulsion surface and the backing surface was measured. The method of measuring the dynamic friction coefficient was as follows. Stick the emulsion surface on top of a smooth table and fix it, place it so that the backing surface contacts the lower emulsion surface, put a 200 g weight on the upper film, and place the upper film at 10 cm / min. The load at the time of pulling was measured to determine the dynamic friction coefficient.

(Matte degree) After conditioning the sample at 23 ° C. and 50% RH for 2 hours, place a metal tube on the backing surface that can be decompressed, and forcibly decompress using a pump, at which time the degree of vacuum is in equilibrium. Was measured. The larger the surface roughness, the closer to the air pressure.

The present invention can be achieved by incorporating a matting agent having a mean particle size of 10 μm or more and a slipping agent into the backing protective layer. The matting agent used is an organic or inorganic powder. Specifically, water-dispersible vinyl polymers such as polymethylmethacrylate, cellulose acetate propionate, and starch are used as organic substances. In particular, spherical matting agents of water-dispersible vinyl polymers such as homopolymers of acrylic acid esters such as methyl methacrylate, glycidyl acrylate, and glycidyl methacrylate, or copolymers of acrylic acid esters with each other or with other vinyl monomers are preferable. As the inorganic compound, silver halide strontium barium sulfate, calcium carbonate, silicon dioxide, magnesium oxide, boron nitride, hollow silica, ethylene tetrafluoride, titanium oxide and the like are preferably used. Addition amount is 1 to 1
It is 000 mg / m ² , preferably 10 to 500 mg / m ² . The average particle size is 10 μm or more and 50 μm or less, preferably 15 μm or more 25
It is less than μm. The particle size can be measured by an electron micrograph or a Coulter counter.

In the present invention, the backing layer preferably contains a slip agent. Typical examples of the slip agent are, for example, US Pat. No. 3,042,522 and British Patent No. 955061.
U.S. Pat.Nos. 3,080,317, 4,0049,27, 4047958.
No. 3,489,576, British Patent No. 1143118, JP-A-60-140.
Silicone-based lubricants described in U.S. Pat. No. 24540
No. 43, No. 2732305, No. 2976148, No. 3206311, German Patent Nos. 1284295, 1284294, etc., higher fatty acid-based, alcohol-based, acid amide-based lubricant, British Patent No. 1263
No. 722, metal soaps described in U.S. Pat.No. 3,933,516, U.S. Pat.Nos. 2588765, 3121060, and ester-based slip agents described in U.K. Patent No. 1198387, U.S. Pat.
There are taurine-based lubricants described in Nos. 3502437 and 3042222.

Specific examples of compounds of the slip agent used in the present invention are shown below.

[0013]

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[0014]

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[0015]

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[0016]

[Chemical 4]

The gelatin used in the present invention includes alkali method gelatin, acid method gelatin, and modified gelatin (for example, Japanese Patent Publication Nos. 38-4854 and 40-12237, British Patent 2,52).
The modified gelatin described in the specification of No. 5,753 etc.) can be used alone or in combination of two or more, and if necessary, a natural or synthetic binder (for example, polyvinyl alcohol, polyvinylpyrrolidone, etc.) can also be used.

The silver halide emulsion used in the light-sensitive material of the present invention contains, as silver halide, ordinary silver halides such as silver bromide, silver chloride, silver iodobromide, silver chlorobromide and silver chloroiodobromide. Any of those used in emulsions can be used, and silver halide grains may be obtained by any of the acidic method, the neutral method and the ammonia method.

The silver halide grain may be one having a uniform silver halide composition distribution within the grain, or a core / shell grain having a different silver halide composition between the inside of the grain and the surface layer, and a latent image May be particles mainly formed on the surface or particles mainly formed inside the particles.

The silver halide grains according to the present invention may have any shape. One preferred example is
It is a cube having a {100} plane as a crystal surface. or,
U.S. Pat.Nos. 4,183,756 and 4,225,666, JP-A-55-26589
, Japanese Patent Publication No. 55-42737, J. Photgr. Sci. 2
By the method described in the literature such as 1.39 (1973), particles having a shape of octahedron, tetrahedron, dodecahedron, etc. can be prepared and used. Further, grains having twin planes may be used.

The silver halide grain according to the present invention may be a grain having a single shape or a mixture of grains having various shapes.

Further, those having any grain size distribution may be used, and the polydisperse emulsion or monodisperse emulsion may be used alone or in combination of several kinds. Further, a polydisperse emulsion and a monodisperse emulsion may be used in combination. As the silver halide emulsion, two or more kinds of silver halide emulsions formed separately may be mixed and used.

Monodisperse emulsions are preferred in the present invention.
As a monodisperse silver halide emulsion in a monodisperse emulsion, when the weight of silver halide contained within a grain size range of ± 20% around the average grain size r is 60% or more of the total weight of silver halide grains, Some are preferable, particularly preferably 70% or more, further preferably 80% or more.

The term "particle size" as used herein means the diameter of spherical silver halide grains, or the diameter of the projected image converted to a circular image of the peripheral area in the case of grains having a shape other than spherical. Is. The particle size is, for example, 10,000 times to 5 times with an electron microscope.
It can be obtained by enlarging the image by a factor of ten thousand, and measuring the particle diameter on the print or the area at the time of projection. (The number of measured grains is indiscriminately 1000 or more.) A particularly preferred highly monodisperse emulsion of the present invention has a monodispersity of 20 defined by grain size standard deviation / mean grain size × 100 = monodispersity. It is as follows, more preferably 15 or less. Monodisperse emulsion is JP-A-54
-48521, 58-49938 and 60-122935 can be referred to.

The light-sensitive silver halide emulsion can be used as it is, as it is, as a so-called primitive emulsion without chemical sensitization, but it is usually chemically sensitized. The emulsion used in the silver halide photographic light-sensitive material of the present invention can use various photographic additives in the steps before and after physical ripening or chemical ripening. Examples of the compound used in such a step include Research Disclosure (RD) No. 1
Various compounds described in 7643, (RD) No. 18716 and (RD) No. 308119 (December 1989) can be used.

The types and locations of the compounds described in these three Research Disclosures (RD) are listed below.

Additive RD-17643 RD-18716 RD-308119 Page Classification Page Page Classification Chemical sensitizer 23 III 648 Upper right 996 III Sensitizing dye 23 IV 648-649 996-8 IV Desensitizing dye 23 IV 998 B Dye 25 ~ 26 VIII 649 ~ 650 1003 VIII Development accelerator 29 XXI 648 Upper right fog inhibitor / stabilizer 24 IV 649 Upper right 1006-7 VI Whitening agent 24 V 998 V Hardener 26 X 651 Left 1004-5 X Surfactant 26-27 XI 650 Right 1005-6 XI Plasticizer 27 XII 650 Right 1006 XII Sliding agent 27 XII Matting agent 28 XVI 650 Right 1008-9 XVI Binder 26 XXII 1003-4 IX Support 28 XVII 1009 XVII Photosensitive material of the present invention The opaque support used for
Paper laminated with olefin polymer (eg, polyethylene, polypropylene, ethylene / butene copolymer), flexible reflective support such as synthetic paper, cellulose acetate, cellulose nitrate, polystyrene, polyvinyl chloride, polyethylene terephthalate, polycarbonate, polyamide Films made of semi-synthetic or synthetic polymers such as, a flexible support in which a reflective layer is provided on these films, and metal are included.

The support used in the present invention may have an undercoat layer. The surface of the undercoat layer can be chemically or physically treated. The treatment is chemical treatment,
Mechanical treatment, corona discharge treatment, flame treatment, ultraviolet treatment,
Surface activation treatments such as high frequency treatment, glow discharge treatment, active plasma treatment, laser treatment, mixed acid treatment, and ozone oxidation treatment can be mentioned.

In the silver halide photographic light-sensitive material of 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 or the like can be used.

Next, the developing / fixing / washing / drying steps in the present invention will be described.

The drying apparatus used in the present invention may be an infrared drying method in addition to the usual hot air method. This infrared drying method may be a generally known method, but it is preferably disclosed in JP-A
The method described in 5-173279 is preferable.

In the present invention, the processing time until developing, fixing, washing and drying is Dry to Dry 90 seconds
The ry to dry processing time may be 60 seconds or less, preferably 50 seconds or less.

Here, "dry to dry" means that from the moment the tip of the photosensitive material to be processed enters the film inserting portion of the automatic developing machine,
It is the time until it is processed and the tip comes out of the machine. In the present invention, rapid processing is premised on automatic processing, but any method may be used for normal processing.

When performing such rapid processing, it is preferable to use an automatic processor. In order to perform stable processing quickly, it is desirable that the line speed of the automatic processing machine is 1000 mm / min or more,
More preferably, it is 1500 mm / min or more.

The developing agent used in the present invention is easy to obtain good performance, and therefore it has a dihydroxybenzene chain and 1-phenyl-3-
Combinations of pyrazolidones are most preferred. Of course, other than this, a p-aminophenol-based developing agent may be contained.

Examples of sulfite preservatives used in the present invention include sodium sulfite, potassium sulfite, lithium sulfite,
Examples include ammonium sulfite, sodium bisulfite, potassium metabisulfite, and formaldehyde sodium bisulfite.

The pH of the developer used in the present invention is 9 to 13
The range of up to is preferable. More preferably, it is in the range of pH 10 to 12. The alkaline agent used for setting the pH includes a pH adjusting agent such as sodium hydroxide, potassium hydroxide, sodium carbonate, potassium carbonate, sodium triphosphate and potassium triphosphate.

JP-A-61-28708 (borate), JP-A-60
-93439 (eg saccharose, acetoxime, 5-
Sulfur salicylic acid), phosphates, carbonates and other buffering agents may be used.

Any known additive may be used as the additive other than the above components.

The development temperature and time are 25 ° C. to 50 ° C.
30 seconds or less is preferable.

The fixer is an aqueous solution containing thiosulfate,
It has a pH of 3.8 or higher, preferably 4.2 to 5.5.

Examples of the fixing agent include sodium thiosulfate and ammonium thiosulfate, which have thiosulfate ion and ammonium ion as essential components, and ammonium thiosulfate having a high fixing rate is particularly preferable.

The fixing solution may contain a water-soluble aluminum salt which acts as a hardening agent, and examples thereof include aluminum chloride, ammonium sulfate, potassium alum and the like. Tartaric acid, citric acid or their conductors may be used alone or in combination of two or more in the fixing solution.

Specific examples include tartaric acid, potassium tartrate, sodium tartrate, potassium sodium tartrate, citric acid, sodium citrate, potassium citrate, lithium citrate, ammonium citrate and the like.

Preservatives (eg sulfite, bisulfite), pH buffering agents (eg acetic acid, nitric acid), pH adjusting agents (eg sulfuric acid), chelating agents having a water softening ability, and the like may be included in the fixing solution, if desired. The compounds described in Japanese Patent Application No. 60-213562 may be included.

The fixing temperature and time are preferably about 20 ° C. to about 50 ° C. for 6 seconds to 1 minute, more preferably 30 ° C. to 40 ° C. for 6 seconds to 30 seconds.

The light-sensitive material of the present invention is washed with water or stabilized after being developed and fixed. For the washing or stabilizing treatment, any method known in the art can be applied, and water containing various additives known in the art can also be used as the washing water or stabilizing solution.

Here, the case where the replenishment amount is 0 means that the replenishment amount is 0, and the replenishment amount is not replenished at all, except that the replenishment amount of the wash water in the water washing tank is appropriately reduced by natural evaporation or the like. When performing the “water” treatment method. For the other methods of washing and stabilizing or additives, any known method may be used.

The light-sensitive material of the present invention can be exposed using electromagnetic waves in the spectral region where the emulsion layers constituting the light-sensitive material have sensitivity.

[0050]

EXAMPLES The present invention will now be specifically described with reference to examples, but the present invention is not limited to these examples.

Example 1 Liquid A Water 1000 ml Propylene oxide-ethylene oxide copolymer 0.15 g NaCl 20 g Gelatin 2 g Nitric acid (3.7 N) 8 ml Liquid B water 440 ml Propylene oxide-ethylene oxide copolymer 0.10 g NaCl 42.0 g Gelatin 10.8g KBr 51.8g K ₃ IrCl ₆ 0.2mg K ₃ RhBr ₆ 0.01mg Make up to 490ml with water C liquid Water 443ml Nitric acid (3.7N) 8.2ml AgNO ₃ 170g Make up to 490ml with water.

PH 3.5 and pAg were added to the above solution A kept at 38 ° C.
While maintaining at 8.0, 1/10 volume of each of the solutions B and C were simultaneously added at a constant rate of 11.0 ml / min, and 2 minutes after that, the remaining solutions B and C were functionally added over 90 minutes. , Continue stirring for another 10 minutes, then adjust the pH to 5 with CaCO ₃ aqueous solution.
8 was prepared, and ordinary desalting was carried out using MgSO ₄ and polynaphthalenesulfonic acid to obtain silver chlorobromide particles having a silver bromide content of 35 mol%, a silver chloride content of 65 mol%, and an average particle size of 0.36 μm.

(Preparation of coating sample) To the obtained emulsion, 0.12 g of citric acid and 0.25 g of KBr were added per mol of silver, and the pH was adjusted to 5.5 and pA.
After adjusting to g7, 1.2 mg of inorganic sulfur and 8.5 mg of chloroauric acid were added, and chemical ripening was performed at 60 ° C. so that the maximum sensitivity was obtained. Then, 1-phenyl-5-mercaptotetrazole 35mg, 4-hydroxy-6-methyl-1,3,3a, 7-tetrazaindene 2g
After adding and lowering the temperature to 50 ° C, sensitizing dye D-1 was added to 230 m.
Spectral sensitization was performed by adding 140 mg of g and D-2. Further, the following amounts of additives were added per mol of silver halide.

Compound 1.4 g NaOH (1 / 2N) 2.8 ml Phenidone 0.14 g Hydroquinone 5.94 g Ethyl acrylate polymer latex 12.2 g Polystyrene sulfonic acid 2.4 g Furthermore, a protective layer for the emulsion layer was prepared as follows. .

Gelatin 170 g Amorphous silica (average particle size 2.8 μm) 42.5 g Bis- (2-ethylhexyl) sulfosuccinate 2.4 g

[0056]

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A backing layer and its protective layer were coated before coating the emulsion layer. The preparation was prepared as follows.

(Backing layer) Gelatin 72 g Compound 0.72 g Compound 2.90 g Sodium dodecylbenzene sulfonate 5.3 g Citric acid 0.50 g Polystyrene sulfonic acid 0.67 g

[0059]

[Chemical 6]

(Backing Protective Layer) Gelatin 42 g Bis- (2 ethylhexyl) sulfosuccinate 0.58 g NaCl 0.2 g Furthermore, as shown in Table 1, polymethylmethacrylate as a matting agent and a slip agent were added. The amount of gelatin in the backing layer was applied to the PET base on which both these liquids were drawn down.
2.2 g / m ² , the amount of gelatin in the backing protective layer 1.0 g / m ² ,
Glyoxal was added as a hardener, and they were simultaneously coated.

After that, the amount of silver was 3.6 g / m ² , the amount of gelatin in the emulsion layer was 1.5 g / m ² , and the amount of gelatin in the emulsion protective layer was 0.7 g / m ² . As a hardener, 14 mg of triazine and 14 mg of formalin were added per 1 g of gelatin.

The samples thus obtained were evaluated as follows. The results are shown in Table 1.

(Friction Coefficient) The obtained sample was conditioned at a temperature and humidity of 23 ° C. and 80% RH for 2 hours, and then the friction coefficient between the emulsion surface and the backing surface was measured. The method of measuring the friction coefficient was as follows. Stick the emulsion surface on a smooth table and fix it, place it so that the backing surface contacts the emulsion surface below,
A 200 g weight was placed on the upper film, and the load when the upper film was pulled at a constant speed was measured to determine the coefficient of friction.

(Matt Degree) After the obtained sample was conditioned at 23 ° C. and 50% RH for 2 hours, a metal cylinder capable of reducing the pressure was placed on the backing surface, and the pressure was forcibly reduced using a pump, and then the equilibrium state was reached. The degree of vacuum was measured. The larger the surface roughness,
The value is close to the air pressure.

(Percentage of defective transportability) The obtained sample was subjected to a facsimile plotter MARK-III (manufactured by Matsushita Electric Transmission Co., Ltd.) at 30 ° C. 80% RH
Then, 10,000 sheets were conveyed and tested, and the defective rate was obtained.

[0066]

[Table 1]

From the results shown in Table 1, it can be seen that the sample of the present invention has a low conveyance failure rate.

Example 2 In the emulsion preparation of Example 1, 280 mg of K ₃ IrCl _{6 in} solution B, K
₃ Liquid A, B and C were prepared in the same manner except that the amount of RhBr _{6 was} 78 mg. These solutions were mixed and desalted in the same manner as in Example 1. However, by setting the initial addition rate to 5.7 cc / min, silver bromide
35 mol%, silver chloride 65 mol%, and silver chlorobromide grains having an average particle diameter of 0.25 μm were obtained.

Preparation of coating sample To the resulting emulsion, 0.12 g of citric acid and 0.6 g of NaCl were added, and p
After preparing H5.5 and pAg7, sodium thiosulfate 8.5mg,
Chloroauric acid (14.2 mg) was added and chemically ripened at 60 ° C to give maximum sensitivity, then 1-phenyl-5-mercaptotetrazole 14
mg and 1.5 g of 4-hydroxy-6-methyl-1,3,3a, 7-tetrazaindene were added.

Next, the sensitizing dyes D-3 and D-4 were respectively added.
14 mg was added for spectral sensitization. Further, the following amounts of additives were added per mol of silver halide.

Compound 1.4 g Phenidone 0.28 g Hydroquinone 4.00 g Compound 60 mg KBr 1.8 g Ethyl acrylate polymer latex 26.4 g Citric acid 0.10 g Polystyrene sulfonic acid 2.4 g Furthermore, a protective layer for the emulsion layer was prepared as follows. did.

Gelatin 170 g Amorphous silica (average particle size 2.8 μm) 34.0 g Bis- (2-ethylhexyl) sulfosuccinate 5.0 g Also, a backing layer and its protective layer were coated before coating the above emulsion layer. . The preparation was prepared as follows.

(Backing Layer) Gelatin 48.8 g Compound 0.35 g Compound 1.26 g Sodium dodecylbenzene sulfonate 1.53 g Citric acid 0.40 g Polystyrene sulfonic acid 0.67 g

[0074]

[Chemical 7]

[0075]

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(Backing Protective Layer) Gelatin 60 g Bis- (2 ethylhexyl) sulfosuccinate 0.72 g NaCl 1.0 g Further, as shown in Table 2, polymethylmethacrylate as a matting agent and a slip agent were added. The amount of gelatin in the backing layer was applied to the PET base on which both these liquids were drawn down.
2.2 g / m ² , the amount of gelatin in the backing protective layer 1.0 g / m ² ,
Glyoxal was added as a hardener, and they were simultaneously coated. After that, the amount of silver was 3.6 g / m ² , the amount of gelatin in the emulsion layer was 1.5 g / m ² ,
The emulsion protective layer was coated such that the amount of gelatin was 0.7 g / m ² . Also, as a hardener, triazine per 1 g of gelatin
14 mg and formalin 14 mg were added.

The same test as in Example 1 was conducted on the obtained sample, and the results are shown in Table 2. Further, the experiment of the conveyance defect rate was conducted by using the facsimile plotter FT-210 (manufactured by NEC) instead of the facsimile plotter MARK-III.

[0078]

[Table 2]

From the results shown in Table 2, it can be seen that the sample of the present invention has a low conveyance failure rate.

[0080]

According to the present invention, it was possible to provide a silver halide photographic material having improved transportability in a facsimile plotter.

Claims (2)

[Claims] 1. A photosensitive material is wound on the outer surface of a writing drum of a facsimile plotter, and the drum is rotated at 500 rpm to 2000 rpm.
A silver halide photographic light-sensitive material having at least one photosensitive silver halide emulsion layer on one side of a support and at least one backing layer on the other side, which is used for writing by rotating rpm. In the material, the dynamic friction coefficient of the emulsion layer and the backing layer after the humidity of the silver halide photographic light-sensitive material is adjusted to 23 ° C. and 80% RH for 2 hours is 0.45 or less, and the matting degree of the backing layer is 200 mmHg to 400 mmHg. A silver halide photographic light-sensitive material characterized by the above. 2. A photosensitive material is wound inside a writing drum of a facsimile plotter, and light from a light source is irradiated at 6000 rpm to 300 rpm.
A silver halide photographic light-sensitive material having at least one photosensitive silver halide emulsion layer on one side of a support and at least one backing layer on the other side, which is used for writing by rotating at 00 rpm. In the silver halide photographic light-sensitive material, the dynamic friction coefficient of the emulsion layer and the backing layer after humidity control at 23 ° C. and 80% RH for 2 hours is 0.45 or less, and the matting degree of the backing layer is 640 mmHg to 720 mmHg. A silver halide photographic light-sensitive material characterized by: