JP2939676B2 - Silver halide photographic material - Google Patents

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 novel silver halide photographic light-sensitive material having ultra-high contrast photographic characteristics used in a photomechanical process, and a direct image having good image quality. It relates to a positive silver halide photographic light-sensitive material.

[0002]

2. Description of the Related Art In a process of converting a density change of continuous tone of a document in a photoengraving process into a set of halftone dots having an area proportional to the density, generally, a silver halide photographic light-sensitive material having a hard photographic characteristic is used. Materials are used.

[0003] In order to impart a high contrast characteristic to an image, conventionally, Japanese Patent Application Laid-Open No. 56-106244 and US Patent No. 4,686,167
As shown in the specification, a silver halide photographic light-sensitive material contains a compound such as hydrazine as a so-called toning agent, and further uses silver halide grains which effectively exhibit the toning characteristics of this compound. And other photographic additives are appropriately combined so as to obtain a desired photographic light-sensitive material. Such a silver halide photographic light-sensitive material is certainly stable as a light-sensitive material, and a high-contrast photographic image can be obtained even by processing with a developer capable of rapid processing.

However, systems using hydrazine compounds as described above generally have a drawback that they must be developed at a high pH value.
Development was performed at 1.5 or more. Such a strong alkaline developer is susceptible to air oxidation, and is inconvenient for long-term storage due to a change in development characteristics. It is not preferable from a viewpoint.

In order to avoid the problem of a strongly alkaline developer, a silver halide photographic material capable of obtaining a high-contrast photographic image with a developer having a low pH such as 11.2 or less has been disclosed in European Patent No. 253,665, 333,435
Nos. 345,025 and 356,898, U.S. Pat.
8,604, 4,994,365, 5,041,355 and JP-A-63-223744, JP-A-63-234244, JP-A-63-234245
No. 63-234246 and No. 2-77057. However, the contrast-enhancing activity of the high-contrast agent used in these materials significantly changes with a change in pH when the pH of the developer is 11.2 or less. Since the gamma and the sensitivity are apt to fluctuate, there is a drawback that stable halftone dot quality and a desirable black pin (sandy or pin-like fog generated in an unexposed portion) level cannot be obtained.

Accordingly, a silver halide photographic light-sensitive material which can provide a sufficiently high contrast even with a developer having a low pH value and has stable photographic characteristics even when the pH is changed has been desired.

On the other hand, as one method of forming a positive image using a direct positive type silver halide photographic material, an internal latent image type silver halide emulsion which is not fogged is used.
There has been known a method of performing surface development in the presence of a fogging agent after image exposure to obtain a positive image.

Various techniques are known in the art. For example, U.S. Pat.No. 2,592,250
Nos. 2,456,957, 2,497,875, 2,588,982,
UK Patent No. 1,151,363, JP-B-43-29405, JP-A-47-9434, JP-A-47-9677, JP-A-47-32813, JP-A-47-328
No. 14, No. 48-9727, No. 48-9717, U.S. Pat.
No. 1,266, 3,496,577, JP-A-50-8524, 5
Japanese Patent Publication No. 0-38525 is the main one.

A hydrazine compound is known as a useful fogging agent.

For example, US Pat. Nos. 2,563,785 and 2,582
Hydrazine compound described in US Pat. No. 8,982, naphthyl hydrazine sulfonic acid described in U.S. Pat.No. 2,064,700, or British Patent 1,403,01
Sulfomethylhydrazines described in the specification of Japanese Patent No. 8 have been used as fogging agents. In addition, Tokiko 41-171
No. 84 describes that a color positive image can be obtained using a hydrazide or hydrazone compound.

However, when these compounds are used, the induction period until the start of development is longer than that of the normal latent image silver development, and thus the development is considerably delayed.

Further, the prior art, when applied to the use of a multi-layer color photographic light-sensitive material, has problems such as easy occurrence of non-uniform characteristics between layers and a low maximum density finally obtained.

Further, in order to maintain favorable fogging action and obtain good results, development has conventionally been carried out at a high pH value of 12 or more, but this significantly accelerates the deterioration of the developing agent. This is not desirable because it degrades the film properties of the photographic material.

Therefore, as for the direct positive silver halide photographic light-sensitive material, a light-sensitive material using an advantageous fogging agent which has solved the above-mentioned problems has been desired.

[0015]

A first object of the present invention is to provide a silver halide photographic light-sensitive material capable of exhibiting sufficiently high photographic characteristics with a stable developer.

A second object of the present invention is to provide a silver halide photographic light-sensitive material capable of maintaining stable photographic characteristics with a low pH developer.

A third object of the present invention is to provide a sufficiently high maximum density (Dmax) with a low pH developer when applied to a direct positive silver halide photographic light-sensitive material, An object of the present invention is to provide a silver halide photographic light-sensitive material capable of obtaining good image quality in which the maximum density is large and the minimum density (Dmin) is small even in development, and which has a small increase in the minimum density even after storage over time.

[0018]

The objects of the present invention have been attained by a silver halide photographic light-sensitive material having the following constitution.

That is, the above objects are achieved by a silver halide photographic material characterized in that at least one of the photographic constituent layers contains at least one compound represented by the following general formula (I). Was.

[0020]

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Next, the compound represented by formula (I) will be described in detail.

In the general formula (I), examples of the aromatic group represented by L include a monocyclic (for example, benzene) or bicyclic (for example, naphthalene) aryl group.

The heterocyclic ring represented by L includes N, O,
5 to 10 containing at least one of S or Se atoms
Membered heterocyclic rings, which may be monocyclic or may form a condensed ring with another aromatic or heterocyclic ring. The heterocyclic ring of L is preferably a 5- or 6-membered aromatic heterocyclic ring, for example, a thiophene ring,
Furan ring, pyrrole ring, pyridine ring, imidazole ring,
Quinoline ring, isoquinoline ring, acridine ring, thiazole ring, benzothiazole ring, oxazole ring, benzoxazole ring, thiazole ring, benzothiazole ring, selenazole ring, benzoselenazole ring, benzimidazole ring, benzothiofin ring, pyrazine ring, Examples include a pyridazine ring, an indole ring, a quinoxaline ring, and a quinazoline ring.

L may be substituted with a substituent. Examples of the substituent include the following, and these groups may be further substituted.

For example, an alkyl group, an aralkyl group, an alkenyl group, an alkynyl group, an aryl group, an alkoxyl group,
Alkenyloxy group, alkynyloxy group, aryloxy group, acyloxy group, acylamino group, sulfonamide group, cyanamide group, ureido group, oxamoylamino group, hydrazinocarbonylamino group, alkylamino group, dialkylamino group, amino group, Hydroxyl group,
Halogen atom, alkylthio group, alkenylthio group, mercapto group, sulfo group, carboxyl group, thioureido group, urethane group, sulfamoyl group, carbamoyl group,
An arylthio group, a sulfonyl group, a cyano group and the like.

In the general formula [I], A ₁ and A ₂ are both hydrogen atoms, or one is a hydrogen atom and the other is an acyl group (eg acetyl, trifluoroacetyl, benzoyl, etc.), sulfonyl, etc. Group (eg, methanesulfonyl group, toluenesulfonyl group, etc.) or oxalyl group (eg, ethoxalyl group, etc.).

A ₁ and A ₂ are preferably both hydrogen atoms.

In the general formula [I], G represents a carbonyl group, a sulfonyl group, a sulfoxy group, a phosphoryl group or an iminomethylene group, and G is preferably a carbonyl group.

In the general formula [I], R represents a hydrogen atom and an aliphatic group (eg, methyl,
Ethyl, benzyl, methoxymethyl, trifluoromethyl, phenoxymethyl, benzenesulfonylmethyl, 4-
Methoxybenzenesulfonylmethyl, 1-pyridiniomethyl, hydroxymethyl, methylthiomethyl, phenylthiomethyl, etc.), aromatic groups (eg, phenyl, hydroxymethylphenyl, chlorophenyl, etc.), heterocyclic groups (eg, pyridine, thienyl, furyl, N- Mechirupirijinio etc.), an amino group (e.g. methylamino, dimethylamino, phenylamino, etc.), an alkoxyl group (e.g. methoxy, ethoxy, butoxy, etc.), an aryloxy group (e.g., phenoxy), - COOR ₁ group and -CON (R ₂ ) (R ₃ ) groups are preferred.

R ₁ is a hydrogen atom, an alkyl group (eg, methyl, ethyl, benzyl, hydroxyethyl, etc.), an alkenyl group (eg, allyl, butenyl, etc.), an alkynyl group (eg, propargyl, butynyl, etc.), an aryl group (eg, phenyl, Naphthyl or the like) or a heterocyclic group (eg,
Represents a saturated heterocycle such as 2,2,6,6-tetramethylpiperidinyl, N-ethylpiperidinyl, tetrahydrofuryl and sulfolane and an unsaturated heterocycle such as pyridyl, pyrimidinyl, thienyl and furyl) , R ₂ and R ₃ each represent a hydrogen atom, an alkyl group (eg, methyl, ethyl, benzyl, hydroxyethyl, etc.), an alkenyl group (eg, allyl, butenyl, etc.), an alkynyl group (eg, propargyl, butynyl, etc.), an aryl group (eg, Phenyl, naphthyl, etc.), a heterocyclic group (eg, 2,2,6,6-tetramethylpiperidinyl, N ', N'-diethylpyrazolidinyl, quinuclidinyl, N-ethylpiperidinyl, N-benzylpiperidinyl) Saturated heterocycles such as peridinyl, N-benzylpyrrolidinyl, tetrahydrofuryl, sulfolane and unsaturated such as pyridyl, pyrimidinyl, thienyl, furyl Heterocyclic, etc.), a hydroxyl group, an alkoxyl group (e.g. methoxy, ethoxy, benzyloxy, cyanomethoxy, etc.), alkenyloxy groups (e.g. allyloxy, butenyloxy and the like),
An alkynyloxy group (eg, propargyloxy, butynyloxy, etc.), an aryloxy group (eg, phenoxy, naphthyloxy, etc.), a heterocyclic oxy group (eg, pyridyloxy, pyrimidyloxy, etc.), or an amino group (eg, amino, methylamino, dimethylamino, Dibenzylamino, anilino, etc.).

As R, a hydrogen atom, an aliphatic group, an aromatic group, a —COOR ₁ group and a —CON (R ₂ ) (R ₃ ) group are preferable, and a —COOR ₁ group and a —CON (R ₂ ) (R ₃ ) groups are more preferred.

[0032] The most preferred R in the general formula (I), -COOR ₄ group and _{-CON (R 5) (R 6} ) group (R ₄ represents an alkynyl group or a saturated heterocyclic group, R ₅ Represents a hydrogen atom, an alkyl group, an alkenyl group, an alkynyl group, an aryl group or a heterocyclic group, and R ₆ represents an alkenyl group, an alkynyl group, a saturated heterocyclic group, a hydroxyl group or an alkoxyl group).

Next, specific examples of the compound represented by the general formula [I] are shown below, but the present invention is not limited thereto.

[0034]

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[0035]

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[0036]

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[0037]

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[0038]

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[0039]

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[0040]

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[0041]

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[0042]

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[0043]

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[0044]

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[0045]

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[0046]

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[0047]

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[0048]

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Next, a preferred embodiment in which the silver halide photographic light-sensitive material of the present invention is suitable for a photographic material exhibiting high contrast photographic characteristics will be described.

In a silver halide photographic material capable of obtaining a high-contrast image to which the present invention is applied, at least one of the compounds represented by the above general formula [I] is used as a substance which functions as a high contrast agent. Contained in the photographic light-sensitive material, the amount of the compound of the general formula [I] is 5 × / mol of silver halide contained in the photographic light-sensitive material.
It is preferably from 10 ^-7 mol to 5 × 10 ^-1 mol.

It is particularly preferred that the content be in the range of 5 × 10 ^-6 mol to 1 × 10 ^-2 mol.

The silver halide photographic light-sensitive material of the present invention has at least one silver halide emulsion layer. That is, at least one silver halide emulsion layer may be provided on one side of the support, or at least one silver halide emulsion layer may be provided on both sides of the support.
Layers may be provided. The silver halide emulsion can be coated directly on a support or can be coated via another layer such as a hydrophilic colloid layer containing no silver halide emulsion. A hydrophilic colloid layer as a protective layer may be provided on the emulsion layer. Further, the silver halide emulsion layer may be separately applied to silver halide emulsion layers having different sensitivities, for example, high sensitivity and low sensitivity. In this case, between each silver halide emulsion layer,
An intermediate layer made of a hydrophilic colloid may be provided. Further, an intermediate layer may be provided between the silver halide emulsion layer and the protective layer. That is, if necessary, a non-photosensitive hydrophilic colloid layer such as an intermediate layer, a protective layer, an antihalation layer, and a backing layer may be provided.

In order for the compound represented by the general formula [I] to be contained in the silver halide photographic material of the present invention so as to function as a high contrast agent, it is preferable that the compound is contained in a hydrophilic colloid layer in the photographic material. It is particularly preferred that the compound be contained in a silver halide emulsion layer and / or a hydrophilic colloid layer adjacent to the silver halide emulsion layer.

Next, the silver halide used in the silver halide photographic light-sensitive material of the present invention will be described. Any composition can be used as the silver halide. For example, there are silver chloride, silver chlorobromide, silver chloroiodide, pure silver bromide, silver iodobromide or silver chloroiodobromide. The average size of the silver halide grains is
Those having a range of 0.05 to 0.5 μm are preferably used, and those having a range of 0.10 to 0.40 μm are particularly preferable.

The particle size distribution of the silver halide grains used in the present invention is arbitrary, but the value of the monodispersity defined below is 1 to 30.
Is preferably adjusted, and more preferably in the range of 5 to 20.

Here, the monodispersity is defined by the following equation.

[0057]

(Equation 1)

That is, the monodispersity is defined as a value obtained by multiplying the value obtained by dividing the standard deviation of the particle size by the average particle size by 100. The grain size of silver halide grains is expressed by the ridge length of cubic grains for convenience, and other grains (octahedral, tetrahedral, etc.)
Is calculated by the square root of the projected area.

In the practice of the present invention, for example, silver halide grains having a multilayer structure of at least two layers can be used, for example, silver chloride or silver iodobromide having a core portion of silver halide grains. Alternatively, silver bromide or silver chloroiodobromide grains having a shell portion of silver bromide, a core portion of silver bromide, and a shell portion of silver chloride can be used. At this time, iodine can be contained in any layer, but it is preferable that iodine be within 5 mol%.

The silver halide grains used in the silver halide emulsion of the present invention may be used in the step of forming and / or growing the grains in the form of a complex salt containing a cadmium salt, a zinc salt, a lead salt, a thallium salt, an iridium salt. ), A rhodium salt (including complex salt) and an iron salt (including complex salt), and adding a metal ion to allow the metal element to be contained inside the particle and / or on the particle surface. By immersing the particles in a suitable reducing atmosphere, a reduction sensitizing nucleus can be provided inside the grains and / or on the surface of the grains.

Furthermore, silver halide can be sensitized by various chemical sensitizers. As its sensitizer,
For example, active gelatin, sulfur sensitizer (sodium thiosulfate,
Allylthiocarbamide, thiourea, allylisothiocyanate, etc.), selenium sensitizer (N, N-dimethylselenourea, selenourea, etc.), reduction sensitizer (triethylenetetramine,
Stannous chloride, etc.), for example, potassium chloroaulite,
Various metal sensitizers represented by potassium aurithiocyanate, potassium chloroaurate, 2-aurosulfobenzothiazole methyl chloride, ammonium chloroparadate, potassium chloroplatinate, sodium chloroparadite, etc., alone or More than one species can be used in combination. When a gold sensitizer is used, rhodamonmon can be used as an auxiliary agent.

When the present invention is applied to a light-sensitive material capable of obtaining a high-contrast image, the silver halide grains whose surface sensitivity is higher than the internal sensitivity, that is, silver halide grains giving a so-called negative image. Since it can be preferably applied to the material, the performance can be enhanced by treating with the chemical sensitizer.

The silver halide emulsions used are mercaptos (1-phenyl-5-mercaptotetrazole,
Stabilization or fog suppression can be performed using mercaptobenzthiazole), benzotriazoles (5-bromobenzotriazole-5-methylbenzotriazole), benzimidazoles (6-nitrobenzimidazole), etc. A sensitizing dye, a plasticizer, an antistatic agent, a surfactant, a hardener, a development accelerator, and the like can also be added to the silver halide emulsion used in (1).

When the compound of the general formula [I] according to the present invention is added to a hydrophilic colloid layer, gelatin is suitable as a binder for the hydrophilic colloid layer, but it is also possible to use a hydrophilic colloid other than gelatin. it can.

In carrying out the present invention, examples of the support that can be used for a photosensitive material for obtaining a high-contrast image include baryta paper, polyethylene-coated paper, and polypropylene synthetic paper.
Examples include a glass plate, a cellulose acetate, and a cellulose film such as a polyester film such as polyethylene terephthalate. These supports are appropriately selected depending on the purpose of use of the silver halide photographic light-sensitive material.

For developing a silver halide photographic light-sensitive material for obtaining a high-contrast image, for example, the following developing agents are used.

Representative HO- (CH ＝ CH) n-OH type developing agents include hydroquinone, and catechol and pyrogallol.

As the HO- (CHCHCH) n-NH ₂ type developer, ortho- and para-aminophenols or aminopyrazolones are typical, and N-methyl-p-aminophenol, N-β -Hydroxyethyl-p-aminophenol, p-hydroxyphenylaminoacetic acid, 2-aminonaphthol and the like.

As the heterocyclic developer, 1-phenyl-3
-Pyrazolidone, 1-phenyl-4,4-dimethyl-3-pyrazolidone, 1-phenyl-4-methyl-4-hydroxymethyl-3-pyrazolidone, 1-phenyl-4-methyl-4-hydroxymethyl
Examples thereof include 3-pyrazolidones such as -3-pyrazolidone.

In addition, TH James, The Theory of the Photographic Process, 4th Edition (The
Theory of the Photographic Process, Fourth E
dition) pp. 291-334 and the Journal of the American Chemical Society (Journal of the Ame)
rican Chemical Society) 73, 3,100 (195
The developer as described in 1) can be used effectively in the present invention. These developers may be used alone or in combination of two or more, but it is preferable to use two or more in combination (in the case of a single agent, hydroquinone is used in combination with 1-phenyl).
-3-pyrazolidone or hydroquinone and N-methyl = p
-Aminophenol combinations are preferred).

The effect of the present invention is not impaired even if a sulfite such as sodium sulfite or potassium sulfite is used as a preservative in the developer used for the development. Also, hydroxylamine and hydrazine compounds may be used as preservatives. Others, such as those used in caustic alkalis, alkali carbonates or amines, are generally used in black and white developers.
H adjustment and buffer function, and inorganic development inhibitors such as bromkari and organic development inhibitors such as benzotriazole; metal ion scavengers such as ethylenediaminetetraacetic acid; development accelerators such as methanol, ethanol and benzyl alcohol; alkyl It is not possible to add surfactants such as aryl sulfonic acid naphthol, natural saponins, sugars or alkyl esters of the above compounds, hardeners such as glutaraldehyde, formalin, glyoxal, etc., and ionic strength modifiers such as sodium sulfate. Optional.

In the present invention, an amine compound, a hydrazine compound, an onium salt compound or a poly (silver) compound may be added to a photosensitive silver halide emulsion layer, a layer adjacent thereto or a developing solution for the purpose of increasing sensitivity, increasing contrast or promoting development. An alkylene oxide compound may be contained, and the performance of the present invention can be enhanced by using these compounds or by using these compounds in combination. Specific examples of these compounds include, for example, a nucleation promoting compound described in Japanese Patent Application No. 2-160538 and a compound represented by the general formula [P] = R ₁ -O-
Specific examples of the compound represented by (CH ₂ CH ₂ O) _n H are exemplified.

Next, a preferred embodiment in which the light-sensitive material of the present invention is directly used as a positive silver halide photographic light-sensitive material will be described.

In this case, the compound represented by the general formula [I] can function as a fogging agent. Hereinafter, when the compound represented by the general formula [I] is used as a fogging agent, it is referred to as “fogging agent of the present invention”.

The fogging agent of the present invention is prepared so that at least one of them is fogged with an internal latent image type silver halide emulsion which is an emulsion which directly gives a positive image upon development after image exposure. It only has to exist. That is, the photographic material having the internal latent image type silver halide emulsion may be incorporated into the photographic material in such a manner that it can be subjected to development processing in the presence of the fogging agent of the present invention after exposure.

In a preferred embodiment, at least one of the fogging agents of the present invention is coated with a silver halide emulsion layer or a layer adjacent thereto (for example, a silver halide photosensitive layer, an intermediate layer, a filter layer, a protective layer, an antihalation layer and the like). )).

The amount of the fogging agent of the present invention can be varied in a wide range depending on the characteristics of the silver halide emulsion used, the type of the fogging agent, and the developing conditions, but a photographic material having an internal latent image type silver halide emulsion can be used. Is exposed to an image and then developed with a surface developer to provide a fogging action sufficient to obtain a positive image. It is desirable that the amount is sufficient to give a sufficient maximum density (for example, 2.0 or more) after the development processing.

To incorporate the fogging agent of the present invention into a silver halide emulsion, at an appropriate time after the completion of ripening, the fogging agent is added in an amount of about 10 ^-5 mol to 10 ^-1 mol per mol of silver halide. It is preferable to include it.

In the practice of the present invention, silver halide developers that can be used in the development processing include hydroquinones, catechols, aminophenols, 3-pyrazolidones, ascorbic acid and its derivatives, reductones, phenylene Diamines and the like or a mixture thereof are included. These developers can be incorporated in the emulsion in advance so that they act on the silver halide during immersion in a high pH aqueous solution.

In the practice of the present invention, the developing composition used for developing the direct positive silver halide photographic light-sensitive material can further contain specific antifoggants and development inhibitors. Alternatively, these compositions can be arbitrarily incorporated into a layer film of a silver halide photographic material. Usually useful antifoggants include, for example, benzotriazoles, benzothiazoles such as 5-methylbenzothiazole; 1-phenyl-5-mercaptotetrazole, 5-methylbenzotriazole and the like, 1-methyl-2- Heterocyclic thiones such as tetrazoline-5-thione; aromatic and aliphatic mercapto compounds;

When the present invention is applied to a direct positive silver halide photographic light-sensitive material, the silver halide emulsion is an internal latent image type silver halide emulsion, that is, a latent image is mainly formed inside silver halide grains. And emulsions having silver halide grains having most of the photosensitive nuclei inside the grains. The silver halide for forming this emulsion includes any silver halide, for example, silver bromide, silver chloride, silver chlorobromide, silver iodobromide, silver chloroiodobromide and the like.

Particularly preferably, the emulsion used in this case is prepared by coating a portion of a sample obtained by coating the emulsion on a transparent support with about 1 part.
Exposure to the light intensity scale for a defined time period up to seconds, substantially free of silver halide solvent, using the following surface developer A that develops only the surface image of the grains
When developed at 20 ° C. for 4 minutes, another part of the same emulsion sample is similarly exposed to develop an internal image of the grains. It indicates the maximum concentration not greater than 1/5 of the concentration. Preferably, the maximum density obtained with the surface developer A is not more than 1/10 of the maximum density obtained with the internal developer.

Surface developer A Metol 1.5 g L-ascorbic acid 10 g NaBO ₂ .4H ₂ O 20 g KBr 1 g Add water 1 liter Internal developer B Metol 2.0 g Sodium sulfite (anhydrous) 90.0 g Hydroquinone 8.0 g Sodium carbonate Salt 52.5 g KBr 5.0 g KI 0.5 g 1 liter by adding water Also, the internal latent image type silver halide emulsion includes those prepared by various methods. For example, U.S. Patent 2,592,250
No. 3,206,316, U.S. Pat.No. 3,317,322,
No. 3,367,778, silver halide emulsions having internally chemically sensitized silver halide grains described in JP-B-43-29405, or U.S. Pat.Nos. 3,271,157, 3,4
No. 47,927, silver halide emulsions having silver halide grains containing polyvalent metal ions described in 3,531,291, or a laminated structure described in JP-A-50-8524 Or a silver halide emulsion containing silver iodide prepared by the ammonia method described in Japanese Patent Application No. 51-74062.

Further, the internal latent image type silver halide emulsion to be used preferably contains a compound having an azaindene ring and a nitrogen-containing heterocyclic compound having a mercapto group in an amount of preferably 1 mg to 10 g per 1 mol of silver halide. By
More stable results with lower minimum concentrations can be given.

Compounds having an azaindene ring include:
4-Hydroxy-6-methyl-1,3,3a, 7-tetrazaindene is preferred. Examples of the nitrogen-containing heterocyclic compound having a mercapto group include a pyrazole ring, a 1,2,4-triazole ring, and a 1,2,3-
Triazole ring, 1,3,4-thiadiazole ring, 1,2,3-thiadiazole ring, 1,2,4-thiadiazole ring, 1,2,5-thiadiazole ring, 1,2,3,4-tetrazole ring, Pyridazine ring,
1,2,3-triazine ring, 1,2,4-triazine ring, 1,3,5-triazine ring, rings obtained by condensing two or three of these rings, for example, triazolotriazole ring, diazaindene ring, triazain There are a den ring, a tetrazaindene ring, a pentazaindene ring and the like, a phthalazinone ring, an indazole ring and the like, and 1-phenyl-5-mercaptotetrazole is preferred.

The silver halide photographic light-sensitive material of the present invention, particularly when applied to a positive-type light-sensitive material, may be a black-and-white photographic light-sensitive material, a monochromatic color photographic material or a multicolor photographic light-sensitive material. When a full-color light-sensitive material is used, it is preferable that the light-sensitive material has a blue light-sensitive layer, a green light-sensitive layer and a red light-sensitive layer. In this case, a photographic light-sensitive material is usually prepared from a blue light-sensitive silver halide emulsion layer containing a yellow coupler, a green light-sensitive silver halide emulsion layer containing a magenta coupler, and a red light-sensitive silver halide emulsion layer containing a cyan coupler. Is formed.

In one preferred embodiment, a blue-sensitive layer, a green-sensitive layer, and a red-sensitive layer are arranged in order from the side far from the support, and a non-light-sensitive layer is provided between the blue-sensitive layer and the green-sensitive layer. (Yellow filter layer).

As the yellow coupler, known acylacetoanilide-based couplers can be preferably used, and among these, benzoylacetoanilide-based and pivaloylacetoanilide-based compounds are preferable.

As the magenta coupler, a 5-pyrazolone coupler, a pyrazoloazole coupler, and an open-chain acylacetanilide coupler can be used.

As the cyan coupler, naphthol couplers and phenol couplers can also be preferably used.

In addition to a light-sensitive silver halide emulsion layer and a non-photosensitive layer serving as a yellow filter layer as described above, an intermediate layer, a protective layer, an undercoat layer, a backing layer, It is possible to provide a number of various photographic constituent layers such as an antihalation layer. As these coating methods, a dip coating method, an air doctor coating method, an extrusion coating method, a slide hopper coating method, a curtain flow coating method, and the like can be applied.

When a direct positive silver halide photographic light-sensitive material is used, the support may be, for example, a polyethylene terephthalate film, a polycarbonate film, a polystyrene film, a polypropylene film, a cellulose acetate film, a glass, a baryta, which is subjected to an undercoating process as required. Paper, polyethylene laminated paper and the like.

The support may be opaque or transparent, and can be selected depending on the intended light-sensitive material.

Various photographic additives such as a wetting agent, a film property improving agent, and a coating aid can be added to the silver halide emulsion of the light-sensitive material according to the purpose. Still other photographic additives include gelatin plasticizers, surfactants, ultraviolet absorbers, pH adjusters, antioxidants, antistatic agents, thickeners, graininess improvers, dyes, mordants, brighteners, A developing speed regulator, a matting agent and the like can also be used.

Also, in order to prevent fading of the dye image due to actinic rays having a short wavelength, an ultraviolet absorber such as thiazolidone,
It is useful to use a benzotriazole, acrylonitrile, or benzophenone compound.

In the silver halide emulsion layer, gelatin or any other suitable gelatin derivative may be used as a protective colloid or a binder according to the purpose, and other hydrophilic binders may be used according to the purpose. Agent (binder)
Can be included. The photographic light-sensitive material can be added to the photographic constituent layers such as an emulsion layer or an intermediate layer, a protective layer, a filter layer, and a backing layer according to the purpose. Humectants, wetting agents and the like.

Each constituent layer can be hardened with any appropriate hardener.

Further, an AS agent (antistain agent) can be used for the photosensitive material.

[0099]

EXAMPLES Specific examples of the present invention will be described below, but the embodiments of the present invention are not limited to these examples.

Example 1 (Preparation of Silver Halide Emulsion A) A silver iodobromide emulsion (2 mol% of silver iodide per mol of silver) was prepared by a double jet method. During this mixing, 8 × 10 ^-7 mol of K ₂ IrCl ₆ was added per mol of silver. The resulting emulsion was an emulsion composed of cubic monodisperse particles (average coefficient of variation: 9.5%) having an average particle size of 0.20 μm. To this emulsion was added 6.5 ml of a 1% aqueous solution of potassium iodide per mole of silver, followed by denatured gelatin (Japanese Patent Application No. 1-180787).
Compound G-8) was washed with water and desalted in the same manner as in Example 1 of Japanese Patent Application No. 1-180787. The pAg at 40 ° C. after desalting was 8.0. Further, at the time of redispersion, a mixture of the following compounds [A], [B] and [C] was added as an antibacterial agent.

[0101]

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(Preparation of silver halide photographic light-sensitive material) One side of a 100 μm-thick polyethylene terephthalate film having a 0.1 μm-thick undercoat layer on both sides (see Example 1 of JP-A-59-19941) on the undercoat layer, the following formulation (1) the amount of gelatin is 2.0 g / m ² of silver halide emulsion layers of the silver amount of 3.2 g / m ²
And an emulsion protective layer of the following formula (2) is further applied thereon so that the amount of gelatin becomes 1.0 g / m ² ,
A backing layer of the following formula (3) was coated on the other undercoat layer on the opposite side so that the amount of gelatin became 2.4 g / m ² , and a backing layer of the following formula (4) was further formed thereon. The protective layer was applied so that the amount of gelatin became 1.0 g / m ² ,
I got

Formula (1) (Silver halide emulsion layer composition)

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[0105]

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Formula (2) (Emulsion protective layer composition)

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Formulation (3) (Backing composition)

[0109]

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Formulation (4) (backing protective layer composition) Gelatin 1 g / m ² matting agent: polymethyl methacrylate having an average particle size of 3.0 to 5.0 μm 15 g / m ² surfactant: S-2 10 g /
m ² Hardener: glyoxal 25 mg / m ^2: the H-1 35 mg / m ² obtained sample was subjected to dot quality test by the following method.

(Dot Quality Test Method) A halftone screen (150 lines / inch) having a halftone dot area of 50% was partially attached to the step wedge, and the sample was brought into close contact with the screen, and the step was measured with a xenon light source.
Exposure for 2 seconds, this sample was subjected to development processing under the following conditions in a rapid processing automatic developing machine charged with the following developing solution and the following fixing solution, and the dot quality of the sample was observed with a loupe of 100 times,
Those with high dot quality are ranked "5", and the following "4",
"3", "2", "1", the rank is sequentially lowered to 5
It was rated on a scale. Note that the ranks “1” and “2” are levels that are not preferable for practical use.

Developer Formulation Hydroquinone 45.0 g N-methyl-p-aminophenol 1/2 sulfate 0.8 g Sodium hydroxide 18.0 g Potassium hydroxide 55.0 g 2-Sulfosalicylic acid 45.0 g Boric acid 25.0 g Potassium sulfite 110.0 g Ethylenediamine Sodium acetate 1.0 g Potassium bromide 6.0 g 5-methylbenzotriazole 0.6 g n-butylethanolamine 15.0 g Add water and adjust pH with 1 liter sulfuric acid pH = 11.2 (Developer 1) pH = 11.0 (Developer 2) pH = 10.8 (Developer 3) pH = 10.5 (Developer 4) Fixer formulation (Composition A) Ammonium thiosulfate (72.5 w / v% aqueous solution) 240 ml Sodium sulfite 17 g Sodium acetate trihydrate 6.5 g Boric acid 6 g Sodium citrate dihydrate 2 g (Composition B) Pure water (ion exchange water) 17 ml Sulfuric acid (50 w / v% aqueous solution) 4.7 g Aluminum sulfate (Al ₂ O ₃ equivalent content of 8.1 w / v% aqueous solution) 26.5 g Fixing When the solution was used, the composition A and the composition B were dissolved in 500 ml of water in this order, and the solution was finished to 1 liter and used. PH of this fixer
Was adjusted to 4.8 with acetic acid.

Development Processing Conditions (Step) (Temperature) (Time) Current Image 40 ° C. 15 seconds Fix 35 ° C. 15 seconds Rinse 30 ° C. 10 seconds Dry 50 ° C. 10 seconds Silver halide emulsion in formula (1) The following compounds (a), (b) and (c) were added as comparative compounds of the hydrazine derivative of the present invention added to the layer.

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[0115]

[Table 1]

[0116]

[Table 2]

From Table 1, it can be seen that the sample according to the present invention has better overall dot quality and black pin evaluation compared to the comparison. Also, from Table 2, it can be seen that a stable halftone dot quality and a more favorable black pin level are provided with respect to the pH fluctuation of the developer in a relatively low pH range of pH = 10.5 to 11.2.

Example 2 (Preparation of Emulsion A) A monodisperse silver bromide emulsion was prepared in the following manner.

While controlling the aqueous solution containing ossein gelatin at 70 ° C. and stirring vigorously, an aqueous solution of silver nitrate and an aqueous solution of potassium bromide were simultaneously added to the solution by a control double jet method to give an average particle size of 0.4. A μm octahedral emulsion was obtained. This emulsion was chemically ripened by adding 5 mg of sodium thiosulfate and 6 mg of chloroauric acid (tetrahydrate) per mole of silver and heating at 75 ° C. for 80 minutes to obtain a silver bromide core emulsion. An aqueous solution of silver nitrate and potassium bromide and sodium chloride (in molar ratio) were further added to the core emulsion thus obtained.
(50:50).
A 7 μm octahedral monodispersed core / shell silver chlorobromide emulsion was obtained.
After washing with water and desalting, 1.3 mg of sodium thiosulfate and 1.3 mg of chloroauric acid (tetrahydrate) were added to the emulsion at a rate of 60 ° C.
For 70 minutes to perform a chemical sensitization treatment to obtain an internal latent image type silver halide emulsion.

(Preparation of Sample) A color photographic light-sensitive material having the following layer constitution was prepared on a paper support laminated on both sides with polyethylene, and used as Sample 31.

Sample 31 (Unless otherwise specified, the amount of each compound is shown by a numeral with the amount coated. The unit is mg / dm ^2, where the emulsion is converted to silver. The structure of the compound is described later.) Seventh layer (protective layer) Gelatin 12.3 6th layer (ultraviolet absorbing layer) Gelatin 5.4 Ultraviolet absorbing agent (UV-1) 1.0 Ultraviolet absorbing agent (UV-2) 2.8 Solvent (SO-3) 1.2 5th layer (blue photosensitive layer) Emulsion A ( 5.0 Gelatin 13.5 Yellow coupler (YC-1) 8.4 Image stabilizer (AO-3) 3.0 Solvent (SO-1) 5.2 Compound (d) 5 × 10 ^-3 mol / mol Ag 4 layers (yellow filter layer) Gelatin 4.2 Yellow colloidal silver 1.0 Ultraviolet absorber (UV-1) 0.5 Ultraviolet absorber (UV-2) 1.4 Color mixture inhibitor (AS-1) 0.4 Solvent (SO-3) 0.8 Third layer (Green photosensitive layer) Emulsion A (including sensitizing dye GD-1) Chin 13.0 Magenta coupler (MC-1) 2.4 Image stabilizer (AO-1) 2.0 solvent (SO-4) 3.15 Compound (d) 5 × 10 ^-3 mol / mol Ag second layer (color mixing preventing layer) Gelatin 7.5 mixing Inhibitor (AS-1) 0.55 Solvent (SO-2) 0.72 First layer (red photosensitive layer) Emulsion A (including sensitizing dyes RD-1 and RD-2) 4.0 Gelatin 13.8 Cyan coupler (CC) -1) 2.1 Cyan coupler (CC-2) 2.1 Image stabilizer (AO-3) 2.2 Solvent (SO-1) 3.3 Compound (d) 5 × 10 ^-3 mol / mol Ag SA-1 is used as a coating aid. , SA-2, and HA-2 as a hardener.

The compounds used for each of the above-mentioned layers are shown below.

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[0127]

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On the other hand, in the same manner as in the sample 31, except that the compound (d) in each layer was changed to the compound (e) and the fogging agent represented by the general formula [I] of the present invention shown in Table 3, Created 32-40.

The structures of the compounds (d) and (e) used as comparative fogging agents are shown below.

[0130]

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Each of the obtained samples was exposed through an optical wedge using a sensitometer, and processed in the following processing steps.

(Processing-1) Processing Step Time Temperature Color development 2 minutes 33 ° C Bleaching and fixing 40 seconds 33 ° C Stability 20 seconds 3 times 33 ° C Drying 30 seconds 60-80 ° C <Color developing solution-1> Diethylenetriamine pentaacetic acid 2.0 g Benzyl alcohol 12.8 g Diethylene glycol 3.4 g Sodium sulfite 2.0 g Sodium bromide 0.5 g Hydroxylamine sulfate 2.6 g Sodium chloride 3.2 g 3-Methyl-4-amino-N-ethyl-N- (β-methane Sulfonamidoethyl) aniline 4.25 g Potassium carbonate 30.0 g Optical brightener (4,4'-diaminostilbene disulfonic acid derivative) 1.0 g Water 1 liter pH 10.5 (pH adjusted with potassium hydroxide and sulfuric acid) <Prescription of bleach-fixing solution> Ammonium thiosulfate (54wt%) 150ml Sodium sulfite 15g Iron ethylenediaminetetraacetate 55g (III) Ammonium sodium ethylenediaminetetraacetate (Dihydrate) 4 g Glacial acetic acid 8.61 g Water was added and 1 liter pH 5.4 (pH was adjusted with aqueous ammonia or hydrochloric acid.) <Stable liquid>1-hydroxyethylidene-1,1'-diphosphonic acid (60%) 1.6ml bismuth chloride 0.35g polyvinylpyrrolidone 0.25g ammonia water 2.5ml nitrilotriacetic acid / 3Na 1.0g 5-chloro-2-methyl-4-inch azirin-3-one 50mg 2-octyl-4-isothiazolin-3-one 50 mg Fluorescent whitening agent (4,4'-diaminostilbene) 1.0 g 1 liter by adding water pH 7.5 (pH was adjusted with potassium hydroxide or hydrochloric acid.) (Treatment-2) pH of color developing solution was 11.0 Except that it was adjusted to
This is the same as processing-1.

Sensitometry is performed on the obtained image, and the maximum density Dmax and the minimum density D are obtained for the magenta image.
The min was evaluated and the results are shown in Table 3.

[0134]

[Table 3]

As is clear from Table 3, the samples containing the fogging agent of the present invention (samples 33 to 40) were lower in pH treatment than the samples (31, 32) containing the comparative compound which is a known fogging agent. It was also found that a good positive image having a large maximum density and a small minimum density was obtained.

Example 3 Samples 41 to 50 were prepared in exactly the same manner as in Example 2 except that the compounds shown in Table 4 were used as fogging agents.

The samples were exposed in the same manner as in Example 2,
Processed in process-1. The minimum density of the obtained magenta image is defined as Dmin.

On the other hand, the raw sample (the sample before exposure and development) was
It was stored for 3 days under the conditions of 50 ° C. and 80% RH for forced deterioration, exposed, and processed as described above. The minimum density of the magenta image at this time is (Dmin) '.

Table 4 shows the values of Dmin and (Dmin) '.

[0140]

[Table 4]

As is evident from Table 4, the samples containing the fogging agent of the present invention (samples 43 to 50) were more stable than the samples containing the comparative compound which is a known fogging agent (41, 42) even after storage over time. It can be seen that the rise in the minimum concentration is small and the raw sample has excellent stability over time.

[0142]

According to the present invention, even when processed with a low pH developing solution having a pH of 11.2 or less, a high contrast, low fog and a low developing pH are obtained.
A silver halide photographic light-sensitive material having good halftone dot quality, which is stable against fluctuations, could be provided. Also, by applying the present invention directly to a positive silver halide photographic light-sensitive material, a sufficiently high maximum density can be obtained even when developed with a developer having a low pH, and the maximum density can be obtained by fog development for a relatively short time. A good positive image having a large and small minimum density was obtained, and an image having a small increase in minimum density even after storage with time could be provided.

Claims (1)

(57) [Claims] 1. A silver halide photographic material comprising at least one compound represented by the following general formula [I] in at least one of the photographic constituent layers. Embedded image