JPH0772789B2 - High contrast silver halide photographic material - Google Patents

Description

The present invention relates to a high-contrast silver halide photographic light-sensitive material. INDUSTRIAL APPLICABILITY The present invention can be suitably used, for example, as a so-called backside silver halide photographic light-sensitive material which is exposed from the backing layer side.

[Conventional technology]

Among such conventional silver halide photographic light-sensitive materials for plate making, as a silver halide photographic light-sensitive material used for camera photography, a high-contrast photosensitive silver halide emulsion is coated on a support. A silver halide photographic light-sensitive material having a non-photosensitive backing layer coated on the opposite side of the support is used.

When photographing with a camera, when the photograph is taken through an optical lens system, the document is exposed in a mirror image of left-right reversal. In order to avoid this in printing of a printing plate for letterpress printing, the exposure is performed not from the silver halide emulsion layer side but from the backing layer side to obtain a normal image.

However, ordinary silver halide photographic light-sensitive materials are designed to be exposed from the emulsion layer side, and when exposed from the backing layer side, the amount of transmitted light decreases due to the light absorption of the dye on the backing layer side, resulting in low sensitivity. There is. In addition, the characteristics of the surface state on the backing layer side are likely to cause problems such as microscopic holes called pinholes scattered on the photographic image, which is an obstacle.

[Object of the Invention]

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned problems of the prior art and to provide a silver halide photographic light-sensitive material which is highly sensitive, does not generate pinholes, and has a high contrast and a sharp image.

[Structure of Invention]

The present invention comprises coating a photosensitive silver halide emulsion on one side of a transparent support and a non-photosensitive backing layer on the other side of the support, and exposing from the side of the backing layer. A silver halide photographic light-sensitive material for forming an image, wherein the backing layer contains a paint, and the dye concentration of the backing layer is such that the average transmittance by light of a photosensitive wavelength is 40% or more, The average particle size on the outermost layer of the backing layer is 10
The present invention provides a silver halide photographic light-sensitive material characterized by containing a matting agent having a monodispersity of 5 to 50 and a refractive index of 2 or less per binder in an amount of 1 to 15% by weight. The above object of (1) is achieved by this configuration.

However, the above-mentioned average transmittance means that when exposed from the backing layer side, the average transmittance is 50% when the dose concentration at which the sensitivity is reduced to 1/2.
And means the transmittance calculated by this calculation method.

The outermost layer of the backing layer is the outermost surface layer on the backing layer side (usually a protective layer, but is not limited to the protective layer), but does not exclude the case of further coating, It means that it substantially functions as the outermost layer.

Further, the binder means a hydrophilic colloid matrix to be dispersed and supported.

In the present invention, the average transmittance for light of a photosensitive wavelength is 40
The dye concentration of the backing layer is set so as to be not less than%, and such a dye concentration can be obtained by appropriately selecting various dyes depending on the spectral sensitivity characteristics of the photosensitive silver halide emulsion layer side.

For example, as a general means, an orthochromatic type sensitizing dye is used on the photosensitive silver halide emulsion layer side. In this case, the absorption maximum wavelength λmax is 500 nm to 600 n.
Those in the range of m are preferred. To obtain such a spectral characteristic, Japanese Patent Publication Nos. 46-18105, 46-18108 and 46-
It is preferable to use the sensitizing dyes disclosed in, for example, 18106 and 48-41204.

For example, using the dye for the backing layer of the silver halide photographic light-sensitive material as described above, the average transmittance by light of the photosensitive wavelength is
The desired backing concentration can be achieved by appropriately selecting the dye so as to be 40% or more and adjusting the amount used.

In a preferred embodiment of the present invention, light is projected from the backing layer side to be exposed. In such an embodiment, the higher the transmittance of the backing layer, the higher the sensitivity obtained. However, in terms of photographic characteristics, if the average transmittance required for the light of the photosensitive wavelength is 40% or more, if the average transmittance is out of this range,
Various characteristics such as sensitivity, sharpness, and pinhole defects will deteriorate. The average transmittance is preferably 40% to 90%, more preferably 50% to 80%.

The light source for sensitizing the silver halide photographic light-sensitive material of the present invention is arbitrary, but as the light source, for example, a tungsten lamp, a metal halide lamp, a xenon lamp, a mercury lamp, an electrodeless microwave electrode, or the like is used according to the sensitivity. be able to.

Next, the matting agent used in the backing layer in the present invention will be described. In the light-sensitive material of the present invention, the matting agent contained on the outermost layer of the backing layer has an average particle size of
It is 10 μm or less, the monodispersity is 5 to 50, and the refractive index is 2 or less. Examples of the matting agent having a refractive index of 2 or less include natural silica, synthetic silica, starch, synthetic resin such as polymer of acrylic acid or methacrylic acid ester (for example, polymethylmethacrylate), polyvinyl resin (for example, polyvinyl acetate, (Polyvinyl alcohol), polyvinyl carbonate, homopolymers or copolymers of styrene, hardened gelatin particles and the like.

In the present invention, the matting agent used preferably has a monodisperse particle size. The monodispersity is defined by the following formula (1), but in the present invention, a value of 5 to 50 is used. It is more preferably adjusted to 8-40. Preparation of such a monodispersity is important in the practice of the present invention.

(However, in the formula (1), r _i represents the particle size of the i-th particle, n _i represents the i-th particle, and represents the average particle size.) Also, the average particle size of the matting agent used in the present invention. Is 10 μm or less, and more preferably the average particle size is 6.0 μm or less.

The matting agent according to the present invention is contained in the outermost layer of the backing layer of the silver halide photographic light-sensitive material, and specifically, the backing layer or the hydrophilic layer adjacent to the backing layer or via the intermediate layer. It is preferably contained in the hydrophilic colloid layer. Thus, the outermost layer includes not only the literally outermost layer (usually a protective layer) but also the one that functions as the outermost layer.

It is preferable for the present invention to use the above matting agent according to the present invention as a matting agent for the protective layer on the photosensitive emulsion layer. However, a generally known matting agent may be used on the emulsion layer side. It can be used arbitrarily.

As a method for dispersing the matting agent in the hydrophilic colloid layer, various methods can be arbitrarily adopted. For example, it may be dispersed in a hydrophilic colloid matrix such as gelatin in advance and then added to a desired layer, or it may be dispersed by a homomixer, a ball mill, or ultrasonic vibration in a dispersion aid such as an activator or a thickener. It is also possible to use it after it is done.

The backing side matting agent used in the present invention is 1 to 15% by weight based on the hydrophilic colloid matrix (binder) to be dispersed and supported. If it is more than this, pinholes are generated due to the aggregation of the matting agent, and if it is too little, the vacuum adhesion at the time of printing and printing is deteriorated, and high quality characteristics, especially the back exposure characteristics cannot be obtained.

When a protective layer containing a matting agent is applied to the upper surface of the backing layer, the time until application and drying is preferably within 1 to 15 minutes, and the decreasing portion during drying has a temperature difference between dry bulb and wet bulb. 20
It is preferably not more than 0 °, more preferably not more than 15 °, and the temperature of the wet bulb is preferably 10 ° to 20 °.

As described above, the dye used in the backing layer of the light-sensitive material of the present invention can be arbitrarily selected depending on the spectral characteristics of the light-sensitive silver halide. Dyes preferably used in the practice of the present invention include US Pat. No. 3540887 and US Pat. No. 3615546.
And the dyes disclosed in JP-A-57-185038, JP-B-56-49953 and the like. Specifically, the effects of the invention can be enhanced by using the backing dyes (1) to (16) exemplified below. Naturally, the dye used in the present invention is not limited to the following specific exemplified compounds.

The silver halide used in the silver halide photographic light-sensitive material of the present invention may have any composition. For example, silver chlorobromide or silver chloroiodobromide containing at least 50 mol% of silver chloride can be preferably used. The average grain size of the silver halide grains is preferably in the range of 0.05 to 0.5 μm, more preferably 0.10 to 0.40 μm.

The monodispersity of the silver halide grains used in the present invention is preferably 5 to 25, more preferably 8 to 20 when defined in the following (1). The formula (1) is the same as the formula (1) defining the monodispersity of the matting agent.

That is, the grain size of the silver halide grain can be measured by an optical microscope or a Coulter counter, but for convenience, it is represented by the edge length of the cubic crystal grain, and the monodispersity is as shown in the following formula (1). The value obtained by dividing the standard deviation of by the average particle size () is multiplied by 100.

(However, in the formula (1), r _i represents the grain size of the i-th grain, n _i represents the i-th grain, and represents the average grain size.) Further, as silver halide usable in the present invention, Can have at least two multi-layer laminated structures. For example, silver chlorobromide grains having silver chloride in the core portion and silver bromide in the shell portion, conversely silver bromide in the core portion and silver chloride in the shell portion may be used. At this time, iodine can be contained in any layer within 5 mol%.

When the silver halide emulsion used in the present invention is prepared, a rhodium salt can be added to control sensitivity or gradation. The addition of the rhodium salt is generally preferred during grain formation, but may be during chemical ripening or preparation of the emulsion coating solution.

The rhodium salt used in the present invention may be a simple salt or a double salt. Typically, rhodium chloride, rhodium trichloride, rhodium ammonium chloride and the like are used.

The addition amount of the rhodium salt can be freely changed depending on the required sensitivity and gradation, but a range of 10 ^-9 mol to 10 ^-4 mol is particularly useful for 1 mol of silver.

When the rhodium salt is used, other inorganic compounds such as iridium salt, platinum salt, thallium salt, cobalt salt and gold salt may be used together. Iridium salts are often used for the purpose of imparting high-intensity characteristics, and from 10 ^-9 to 10 ^-4 mol per mol of silver.
It can be preferably used up to a molar range.

The silver halide used in the present invention can be sensitized with various chemical sensitizers. Examples of the sensitizer include active gelatin, sulfur sensitizer (sodium thiosulfate, allylthiocarbamide, thiourea, allylisothiacyanate, etc.), selenium sensitizer (N, N-dimethylselenourea, selenourea, etc.) , Reduction sensitizers (triethylenetetramine, stannous chloride, etc.) such as potassium chloroaurite, potassium aurithiocyanate, potassium chloroaurate, 2-aurosulfobenzothiazole methyl chloride, ammonium chloroparadate, potassium chloroplatinate , Various precious metal sensitizers typified by sodium chloroparadite, etc.
Alternatively, two or more kinds can be used in combination. When a gold sensitizer is used, rhodan ammon can be used as an auxiliary agent.

Further, the silver halide emulsion used in the present invention is, for example, U.S. Patent Nos. 2,444,607, 2,716,062, and 3,512,98.
No. 2, West German application publication No. 1,189,380, No. 2,058,626
No. 2,118,411, Japanese Patent Publication No. 43-4133, U.S. Patent No.
3,342,596, Japanese Patent Publication No. 47-4417, West German application publication No. 2,1
The compounds described in JP-B No. 49,789, JP-B-39-2825 and JP-B-49-13566 are preferably used, and for example, 5,6-trimethylene-7-hydroxy-S-triazolo (1,5-a) is preferable. ) Pyrimidine, 5,6-tetramethylene-7-
Hydroxy-S-triazolo (1,5-a) pyrimidine,
5-methyl-7-hydroxy-S-triazolo (1,5-
a) Pyrimidine, 7-hydroxy-S-triazolo (1,
5-a) pyrimidine, 5-methyl-6-bromo-7-hydroxy-S-triazolo (1,5-a) pyrimidine, gallic acid ester (eg isoamyl gallate, dodecyl gallate, propyl gallate, sodium gallate) ),
Mercaptans (eg 1-phenyl-5-mercaptotetrazole, 2-mercaptobenzthiazole), benzotriazoles (eg 5-bromobenztriazole, 5-methylbenztriazole), benzimidazoles (eg 6-nitrobenzimidazole), etc. Can be used to stabilize.

The silver halide used in the present invention is generally added to the hydrophilic colloid layer, and the hydrophilic colloid used particularly advantageously in the practice of the present invention is gelatin.

As the hydrophilic colloid other than gelatin, for example, colloidal albumin, agar, gum arabic, alginic acid, hydrolyzed cellulose acetate, acrylamide,
Imidized polyamide, polyvinyl alcohol, hydrolyzed polyvinyl acetate, gelatin derivatives such as phenylcarbamyl gelatin, acylated gelatin, phthalated gelatin as described in U.S. Pat.Nos. 2,614,928 and 2,525,753. Alternatively, for example, a polymerizable monomer having an ethylene group such as styrene acrylate, acrylic acid ester, methacrylic acid, and methacrylic acid ester as described in the specifications of U.S. Pat.Nos. 2,548,520 and 2,831,767 can be used as gelatin. The hydrophilic colloids can also be applied to layers containing no silver halide, such as antihalation layers, protective layers and intermediate layers.

The photographic light-sensitive material of the present invention can be embodied by coating a silver halide emulsion layer or a backing layer on a support. Examples of the support that can be used in this case include baryta paper, polyethylene-coated paper, polypropylene synthetic paper, Representative examples include glass plates, cellulose acetate, cellulose nitrate, polyester films such as polyethylene terephthalate, polyamide films, polypropylene films, polycarbonate films, polystyrene films and the like. These supports are appropriately selected depending on the intended use of the silver halide photographic light-sensitive material.

A preferred embodiment of the photographic light-sensitive material of the present invention has a hydrophilic colloid layer containing at least one silver halide-containing colloid layer on a support and a backing layer on the side opposite to the support. A protective layer having an appropriate film thickness, that is, a gelatin protective layer having a thickness of preferably 0.1 to 10 μm, particularly preferably 0.8 to 2 μm is provided on the backing layer side. Of course, the present invention can be applied to a material other than the backside light-sensitive material.

The hydrophilic colloid used in the present invention may optionally contain various photographic additives such as gelatin plasticizer, hardener,
Surfactants, image stabilizers, UV absorbers, antistains, pH adjusters, antioxidants, antistatic agents, thickeners, graininess improvers, dyes, moldants, brighteners, development speed adjusters, etc. Can be used within a range that does not impair the effects of the present invention.

Among the various additives, those that can be particularly preferably used in the practice of the present invention include a thickener or a plasticizer,
For example, U.S. Pat.No. 2,960,404, JP-B-43-4939
Gazette, West German Application Publication No. 1,904,604, JP-A-4
No. 8-63715, Japanese Patent Publication No. 45-15462, Belgian Patent No. 762,833, U.S. Patent No. 3,767,410, Belgian Patent No. 558,143, for example, styrene-sodium maleate Polymers, dextran sulphates, etc., hardeners such as aldehyde series, epoxy series, ethyleneimine series, active halogen series, vinyl sulfone series, isocyanate series, sulfonic acid ester series, carbodiimide series, mucochloric acid series, acryloyl series As various hardeners and ultraviolet absorbers, for example, U.S. Pat.
No. 253,921, British Patent No. 1,309,349, and other compounds described in the respective specifications, particularly 2- (2-hydroxy-5-3).
-Butylphenyl) benzotriazole, 2- (2-hydroxy-3,5-di-tertiarybutylphenyl) benzotriazole, 2- (2-hydroxy-3-tertiarybutyl-5)
-Butylphenyl) -5-chlorobenzotriazole,
2- (2-hydroxy-3,5-di-tertiary-butylphenyl) -5-chlorobenzotriazole and the like can be mentioned, and examples of the dye include U.S. Pat. No. 2,072,908, German Patent 107,990, and U.S. Pat. The compounds described in each specification such as Japanese Patent No. 3,048,487 and US Pat. No. 515,988 can be used, and these compounds may be contained in a protective layer, an emulsion layer or an intermediate layer. Further, as coating aids, emulsifiers, penetrating agents for treating liquids, antifoaming agents or surfactants used for controlling various physical properties of photosensitive materials, British Patent No. 548,532 and No. 1 , 2
No. 16,389, U.S. Pat.
No. 17926, No. 43-13166, No. 48-20785, French Patent No. 202,588, Belgian Patent No. 773,459, etc. There may be used anionic, cationic, nonionic or amphoteric compounds, among which anionic surfactants having a sulfone group, such as succinate sulfonates, alkylnaphthalene sulfonates, alkylbenzene sulfonates, etc. Is preferred.

Further, as an antistatic agent, Japanese Patent Publication No. Sho 24-24159 and Japanese Unexamined Patent Publication No.
8-89979 publications, U.S. Pat.Nos. 2,882,157, 2,9
72,535, JP-A-48-20785 and 48-43130
No. 48-90391, JP-B 46-24159, 46-39312
No. 48-43809, JP-A No. 47-33627, and the like.

As the developing agent used when the silver halide photographic light-sensitive material of the present invention is developed, various optional ones can be mentioned depending on the specifically manufactured light-sensitive material. For example:

Typical examples of HO- (CH = CH) n-OH type developing agents include hydroquinone, and catechol, pyrogallol and its derivatives, ascorbic acid, chlorohydroquinone, bromohydroquinone, isopropylhydroquinone, toluhydroquinone, and methyl. Hydroquinone, 2,3-dichlorohydroquinone, 2,5-dimethylhydroquinone, 2,3-dibromohydroquinone, 2,5
-Dihydroxyacetophenone, 2,5-diethylhydroquinone, 2,5-di-p-phenethylhydroquinone, 2,5-dibenzoylaminohydroquinone, catechol, 4-chlorocatechol, 3-phenylcatechol, 4-phenyl-catechol, There are 3-methoxy-catechol, 4-acetyl-pyrogallol, 4- (2-hydroxybenzoyl) pyrogallol, sodium ascorbate and the like.

Further, as the HO- (CH = CH) n-NH ₂ type developer, ortho and para aminophenols or aminopyrazolones are typical ones, and 4-aminophenol, 2-amino-6-phenylphenol, 2 -Amino-4-chloro-
6-phenylphenol, 4-amino-2-phenylphenol, 3,4-diaminophenol, 3-methyl-4,6
-Diaminophenol, 2,4-diaminoresorcinol, 2,4,6-triaminophenol, N-methyl-p-
Aminophenol, N-β-hydroxyethyl-p-aminophenol, p-hydroxyphenylaminoacetic acid,
2-aminonaphthol and the like.

Further, as H ₂ N- (CH = CH) n-NH ₂ type developer, for example, 4-amino-2-methyl-N, N-diethylaniline, 2,4
-Diamino-N, N-diethylaniline, N- (4-amino-3-methylphenyl) -morpholine, p-phenylenediamine, 4-amino-N, N-dimethyl-3-hydroxyaniline, N, N, N , N-tetramethylparaphenylenediamine, 4-amino-N-ethyl-N- (β-hydroxyethyl) -aniline, 4-amino-3-methyl-N
-Ethyl-N- (β-hydroxyethyl) -aniline,
4-Amino-N-ethyl- (β-methoxyethyl) -3
-Methyl-aniline, 4-amino-3-methyl-N-ethyl-N- (β-methylsulfonamidoethyl) -aniline, 4-amino-N-butyl-N-γ-sulfobutylaniline, 1- (4 -Aminophenyl) -pyrrolidine and the like.

Heterocyclic developers include 1-phenyl-3-pyrazolidone, 1-phenyl-4,4-dimethyl-3-pyrazolidone, 1-phenyl-4-methyl-4-hydroxymethyl-3-pyrazolidone and 1-phenyl. -4-methyl-4
3-pyrazolidones such as -hydroxymethyl-3-pyrazolidone, 1-phenyl-4-amino-5-pyrazolone, 1- (p-aminophenyl) -3-amino-2-
Pyrazoline, 1-phenyl-3-methyl-4-amino-
Examples thereof include 5-pyrazolone and 5-aminouracil.

In addition, TH Theory of the Photographic Process 4th Edition by TH James (The Theory of the
Photographic Process, Fourth Edition) pages 291-334 and the Journal of the American Chemical Societ.
y) Developers described in Vol. 73, page 3,100 (1951) can be effectively used in the present invention. These developers may be used alone or in combination of two or more kinds, but it is preferable to use two or more kinds in combination. Further, even if a sulfite such as sodium sulfite, potassium sulfite, etc. is used as a preservative in the developer used for developing the light-sensitive material of the present invention, the effect of the present invention is not impaired, and It can be mentioned as one characteristic. Moreover, you may use hydroxylamine and a hydrazide compound as a preservative. In addition to adjusting the pH and providing a buffer function with caustic alkali, alkali carbonate or amine as used in general black and white developers, inorganic development inhibition such as bromcali and organic development inhibitors such as benzotriazole, ethylenediaminetetraacetic acid etc. Metal ion scavengers, methanol, ethanol, benzyl alcohol, development accelerators such as polyalkylene oxides, sodium alkylaryl sulfonates, natural saponins, surfactants such as sugars or alkyl ester of the above compounds, glutaraldehyde, formalin, It is optional to add a hardening agent such as glyoxal and an ionic strength adjusting agent such as sodium sulfate.

The developer used in the present invention may contain alkanolamines or glycols as an organic solvent. Examples of the alkanolamine include triethanolamine diethanolamine ethanolamine trimethylamine 2-diethylamino-1-ethanol 2-methylamino-1-ethanol 3-diethylamino-1-propanediol 3-diethylamino-1-propanol 5-amino-1. -Pentanol diethylamine methylamine triethylamine dipropylamine di-isopropylamine 3,3'-diaminodipropylamine 3-dimethylamino-1-propanol hydantoin acid allylamine ethylamine dimethylamine ethylenediamine 2-dimethylaminoethanol 2-ethylaminoethanol 2- (2-Aminoethylamino) ethanol tetramethylammonium acetate choline choline chloride hydro Xylamine sulfate 2-[(2-aminoethylamino) -ethylamino]-
Ethanol aminoguanidine sulphate 6-aminohexanoic acid 3-amino-1-propanol 1-dimethylamino-2-propanol 2-hydroxy-4-thiadecyltrimethylammonium (pta) pyridine glycine o-aminobenzoic acid polyethyleneimine L-(+ ) -Cysteine hydrochloride benzylamine 2-amino-1-ethanol 4-amino-1-butanol 3- (dimethylamino) -1,2-propanediol 3-morpholino-1,2-propanediol 1,4-piperazinebis (Ethanesulfonic acid) 3-piperidino-1,2-propanediol N-piperidine ethanol and the like can be mentioned.

Examples of the above glycols include ethylene glycol, diethylene glycol, propylene glycol, triethylene glycol, 1,4-butanediol, 1,5-pentanediol and the like, and diethylene glycol is preferably used. The amount of alkanolamines and glycols used is 5 to 500 g per developer.
Is preferable, and more preferably 20 to 200 g.

Examples of the above glycols include ethylene glycol, diethylene glycol, propylene glycol, triethylene glycol, 1,4-butanediol, 1,5-pentanediol and the like, and diethylene glycol is preferably used. The amount of these glycols used is preferably 5 to 500 g, more preferably 20 to 200 g, per developer. These organic solvents can be used alone or in combination.

The silver halide photographic light-sensitive material of the present invention can be subjected to development processing using a developer containing a development inhibitor as described above to obtain a light-sensitive material having extremely excellent storage stability.

The pH value of the developer having the above composition is preferably 9 to 12, but the pH value is preferably in the range of 10 to 11 from the viewpoint of stability and photographic characteristics.

The silver halide photographic light-sensitive material of the present invention can be processed under various conditions. The processing temperature is, for example, the development temperature is 50.
The temperature is preferably not higher than 0.degree. C., particularly preferably around 30.degree. C., and the developing time is generally completed within 3 minutes, but particularly preferably within 2 minutes often brings about a favorable effect. Further, it is optional to employ processing steps other than development, such as washing, stopping, stabilizing, fixing, and if necessary, pre-hardening, neutralization, etc., and these steps can be omitted as appropriate. Furthermore, these processes may be so-called hand development processes such as plate development and frame development, or mechanical development such as roller development and hanger development.

〔Example〕

Hereinafter, the present invention will be described by way of examples, but it goes without saying that the present invention is not limited to the examples.

Example 1 Solutions A to E having the compositions shown below were used to obtain an average particle size of 0.24 μm.
A silver chlorobromide emulsion having a composition of m, 65 mol% of silver chloride and 35 mol% of silver bromide was prepared.

Solution A was kept warm at 40 ° C.
Solution B, solution C, solution D and solution E were added by the double jet method while stirring using the mixing stirrer described in No. 24.
The addition method at this time is shown in Table 1 below.

That is, as shown in Table 1, the addition flow rates of the solutions B to E were incrementally changed over 80 minutes to form silver halide grains. Solutions B and C were added during the first 10 minutes of mixing. After 10 minutes, solutions D and E were added. The EAg of the emulsion was kept at 160 mV for 5 minutes from the start, and after 5 minutes from the start of mixing, it was adjusted to 123 ± 5 mV using 1.8 mol / sodium chloride aqueous solution, and thereafter this value was maintained by the sodium chloride aqueous solution. Furthermore, the pH during mixing was kept within the range of 3.0 ± 0.1 by adding 0.1N nitric acid.

After adding solutions B to E, 0.28N sodium carbonate aqueous solution 2
After adding 0 cc, the pH was returned to 5.8 ± 0.1, the emulsion was ripened in Ostwald for 10 minutes, then desalted and washed with water by a conventional method,
Thereafter, 132.4 ml of an aqueous solution of ossein gelatin (containing 10 g of ossein gelatin) was added, and the mixture was dispersed by stirring at 55 ° C for 30 minutes, and then adjusted to 250 ml.

The obtained particles had an average particle size of 0.24 μm and a monodispersity of 10.

A metallic silver electrode and a double junction type saturated Ag / AgCl reference electrode were used for the measurement of the EAg value. (The electrode configuration is
The double junction disclosed in JP-A-57-197534 was used. In addition, a variable flow rate type roller tube metering pump was used to add the solutions B to E.

During addition, it was confirmed by electron microscopy that no new grains were generated by sampling the emulsion, and it was confirmed that the addition amount did not exceed the critical growth rate in the system.

Next, this emulsion was heated to 60 ° C and 5% of 1% citric acid and 1%
After adding 15 cc of potassium bromide aqueous solution and aging for 20 minutes,
2% of 0.1% tetrachloroauric acid aqueous solution and 4% of 0.1% sodium thiosulfate aqueous solution were added, and gold sulfur sensitization was performed for 70 minutes. As a stabilizer, 1% 6-methyl-4-hydroxy-1,3,3a, 7- Tetrazaindene 50cc was added. Compounds (A) and (B) shown below were added as sensitizing dyes at 60 mg and 35 mg, respectively, to perform optical sensitization.

Next, 265 mg of 2,3,5-triphenyltetrazolium chloride as a contrast-improving agent, 100 mg of p-dodecylbenzenesulfonic acid sodium salt, and 109 mg / m of merc saponin as a coating aid.
² , after adding 2% sodium hydroxide aqueous solution to raise the pH to 5.8, 0.2 g / m ² of styrene-butyl acrylate copolymer polymer and 0.48 g of styrene-maleic acid copolymer.
/ lem was added, and the amount of Ag was 4.5 g / m ² and the amount of gelatin was 1.9 g / m ² and coated on the base (g / lem represents the number of grams per emulsion). At that time, 1-decyl-2- (3-isopentyl) succinate-2-sulfonic acid sodium salt was added as a spreading agent at a concentration of 1.1 g / m ² , 7.5 mg / m ² ,
50m silica (SiO ₂ ) with an average particle size of 3.0μm as a matting agent
g / m ² , citric acid to adjust the pH of the silver halide emulsion layer 5.
A protective layer containing 3 mg / m ² and 25 mg / m ² formalin as a hardening agent was applied simultaneously in multiple layers.

Then, a backing coating solution used for coating the backing lower layer was prepared as follows.

(Preparation of Backing Coating Solution) 36 kg of gelatin was swelled in water, heated and dissolved, and then 1.6 kg of the following compound (C-1) as a dye, the exemplified dyes shown in Table 2 and then the following compound (C- 2) was added as a 1.9 kg aqueous solution, then a 20% aqueous solution of saponin 11 and 5 kg of the following compound (C-3) as a physical property adjusting agent were added, and styrene-maleic acid copolymer was added to this solution as a thickener. The combined water-soluble polymer was added in an amount of 800 g to adjust the viscosity, and the pH was adjusted to 5.4 with an aqueous citric acid solution. Finally, 144 g of glyoxal was added and the mixture was adjusted to 960 with water to prepare a BC coating liquid B-1.

Then, a protective film coating solution P-2 was prepared as follows for coating the protective film layer of the backing layer.

(Preparation of protective film coating solution P-2) 50 kg of gelatin was swollen in water and dissolved by heating, and then 340 g of 2-sulfonate-bis (2-ethylhexyl) succinate ester sodium salt was added to the mixture as shown in Table 2 as a matting agent. Add the amount shown in Table 2 and add sodium chloride to 3.
Add 4kg, then glyoxal 1.1kg, mucochloric acid
Add 540g and finish to 1000 with water, then protective film coating solution P-2
Was prepared.

(Preparation of Evaluation Sample) Combinations of the above coating solutions shown in Table 2 were used.
The evaluation sample shown in Table 2 was prepared by coating both surfaces of a polyethylene terephthalate film (thickness: 100 μm) provided with the undercoat layer of Example 1 of 09941. At that time, a backing lower layer was coated on one side of the support coated with an undercoating layer so that the gelatin dry weight was 1.5 g / m ² , and at the same time, a backing protective film layer was coated on the one side with a gelatin dry weight of 1 g / m
^It was applied so that it would be ^2, and evaluation samples No. 1 to No. 22 in Table 2 were prepared.

The prepared evaluation sample (test sample) is brought into contact with the emulsion surface on the board of the plate making camera, the line drawing original is photographed by the back side photography, and then the following processing steps and processing contents are processed.
The resulting image was evaluated. The sensitivity was determined from the exposure amount that gave the best reproducibility of the fine lines of the original, and was expressed as the relative sensitivity with the sensitivity of the evaluation sample No. 1 being 100. For the pinhole, the sample uniformly exposed with the exposure amount at this time was visually observed on a high-brightness light table and evaluated in five levels. The best level is "1", the worst level is "5"
Was evaluated as. Practically, it is considered that the evaluation is “3” or more. The results obtained are shown in Table 3. The results shown in Table 3 show the composition of the dye and the effect of the matting agent, and have high contrast and good sensitivity. In addition to this, the back-shot characteristics, especially the pinhole, are unexpectedly improved, which is remarkable. The effect is clearly shown.

<Development processing conditions> (Process) (Temperature) (Time) Development 28 ° C 30 seconds Fixing 28 ° C 20 seconds Washing at room temperature 20 seconds <Developer formulation> (Composition A) Pure water (ion exchanged water) 150 ml Ethylenediaminetetraacetic acid disodium salt Salt 2g Diethylene glycol 50g Potassium sulfite (55% W / V aqueous solution) 100ml Potassium carbonate 50g Hydroquinone 15g 5-Methylbenzotriazole 200mg 1-Phenyl-5-mercaptotetrazole 30mg Potassium hydroxide Amount to make the pH of the solution 10.4 Potassium bromide 4.5g (Composition B) Pure water (ion exchanged water) 3ml Diethylene glycol 50g Ethylenediaminetetraacetic acid disodium salt 25mg Acetic acid (90% aqueous solution) 0.3ml 5-Nitroindazole 110mg 1-Phenyl-3-pyrazolidone 500mg Water when using developer The above composition A and composition B were melted in this order in 500 ml and finished to 1 before use.

<Fixer formulation> (Composition A) Ammonium thiosulfate (72.5% W / V aqueous solution) 240 ml Sodium sulfite 17g Sodium acetate trihydrate 6.5g Boric acid 6g Sodium citrate dihydrate 2g Acetic acid (90% W / W aqueous solution) 13.6ml (Composition B) Pure water (ion exchanged water) 17ml Sulfuric acid (50% W / W aqueous solution) 4.7g Aluminum sulfate (Al ₂ O ₃ equivalent content is 8.1% W / W aqueous solution) 26.5g Use of fixer At times, the above composition A and composition B were dissolved in 500 ml of water in this order, and the solution was finished to 1 before use. The pH of this fixer is approximately
It was 4.3.

[Effects of the Invention] As described above, according to the present invention, it is possible to obtain a silver halide photographic light-sensitive material which has high sensitivity, does not generate pinholes, and has a high contrast and a sharp image.

Claims (1)

[Claims] 1. A transparent support having a photosensitive silver halide emulsion coated on one surface thereof and a non-photosensitive backing layer coated on the other surface of the support. A silver halide photographic light-sensitive material which is exposed to light to form an image, wherein the backing layer contains a paint, and the dye concentration of the backing layer is such that the average transmittance by light of a photosensitive wavelength is 40% or more. , The average particle size on the outermost layer of the backing layer is
A silver halide photographic light-sensitive material comprising a matting agent having a monodispersity of 5 to 50 and a refractive index of 2 or less in an amount of 1 to 15% by weight with respect to a binder. However, the above average transmittance means that when exposed from the backing layer side, the average transmittance is 50% when the dye concentration at which the sensitivity is reduced to 1/2
And means the transmittance calculated by this calculation method.