JPH06175367A - Planographic printing material - Google Patents

Abstract

PURPOSE:To obtain a planographic printing material having high sensitivity and resolution and excellent printing durability and ink build-up property with which a negative transfer silver picture image is obtd. by silver salt diffusion transfer method, by using a silver halide emulsion having a specified compsn. of silver chloride bromide or silver chloride. CONSTITUTION:This printing material has at least a silver halide emulsion layer and a physical development nucleus layer on a supporting body with which a negative transfer silver picture is obtd. by silver salt diffusion transfer method. The silver halide emulsion is a core/shell type inner latent image emulsion and its compsn. is substantially silver chloride bromide containing <=50mol% Br or silver chloride. As for the crystalline habit of the inner latent image emulsion, the core/shell type emulsion the surface of which is chemically sensitized may be a cube, octahedron or tetradecahedron, and octahedron is preferable. In this halogen compsn., especially if the silver halide is almost silver chloride with decrease of Br, octahedron is more preferable.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a silver salt lithographic printing material, and more particularly to a lithographic printing material for obtaining a negative transfer silver image. More specifically, it relates to laser exposure, is not only excellent in photographic characteristics, has less background stain, but also has improved ink receptivity and printing durability. Regarding printing materials.

[0002]

2. Description of the Related Art Conventionally, many lithographic printing materials utilizing a silver salt transfer method have been known. As a typical printing material, a printing material in which a photographic element having photosensitivity and a physical development nucleus layer which is a printing image element are integrally configured is described in, for example, JP-B-46-42453 and 48-48. It is described in gazettes such as 30562. However, these use an ordinary negative emulsion, and the transferred silver image becomes a positive image. On the other hand, a method of obtaining a negative image as a transferred silver image is disclosed in Japanese Patent Publication No. 61-
13587, Japanese Patent Publication 57-6108, Japanese Patent Publication 56-
26019, JP 61-13587 A, JP 57
-6108, JP-B-56-26019, JP-A-61
No. 173247 and the like. However, with this method, the sensitivity is not sufficient, the transfer silver amount is insufficient, and the performance as a printing plate such as ink receptivity, printing durability and background stain is not sufficient, It hasn't been realized.

With the development of computer technology in recent years, attention has been paid to a direct plate-making technique in which a final image is directly exposed by a laser beam or a light emitting diode light source through an image setter or the like. In the case of scanning exposure with a laser or the like, as a lithographic printing material, a negative transfer silver image needs to expose only the image portion such as characters, halftone dots, and lines, and the exposed portion is small, so that there is no background stain. There are few concerns. Further, normally, the negative output can be considered to have an advantage that it is easier to correspond to an output machine such as an image setter which is a main force. However, a negative type lithographic printing material has not been put to practical use, and as described above, a material satisfying the sensitivity and printing characteristics has not been obtained so far.

As a method of obtaining a negative transfer silver image, there is a method of using a direct reversal emulsion as the emulsion. The direct reversal emulsion includes a precoat type emulsion and an internal latent image type emulsion. Among them, the pre-coating type emulsion has a low sensitivity, is difficult to be made red and infrared sensitive, and when a developing agent is incorporated, a reversal image cannot be obtained and the developing agent is substantially contained. There are some drawbacks such as not being able to be processed by an activator. On the other hand, the internal latent image type emulsion is described in US Pat.
No. 0, No. 2466957, No. 2497875, No. 2
No. 588898, No. 3317322, No. 376126
6, No. 3,761,276, and No. 3,795,677. This product has a high sensitivity, but has the drawback that it is difficult to reverse with a developer containing a silver halide solvent.

JP-A-55-6595 describes a negative image forming method by a peeling type diffusion transfer method using an internal latent image type emulsion. However, the developing solution described here is a viscous developing solution containing hydroxyethyl cellulose having a pH of 13.1, and there is no mention of an activator process or a conventional process containing substantially no developing agent. It is not intended for lithographic printing materials.

By the way, generally, in the planographic printing plate,
The printing surface is composed of an image portion which is lipophilic and has ink receptivity, and a non-image portion which has ink repulsion. Therefore, in the planographic printing material using the silver salt diffusion transfer method,
The silver image deposited on the surface of the printing plate by the diffusion transfer method is used as the lipophilic image part, and the part where the silver image is not deposited is hydrophilic,
That is, it is used as a non-image portion having ink repulsion. When printing is performed using such a lithographic printing material, water and ink are simultaneously supplied to the plate surface so that the image area receives the ink and the non-image area is selected with water. Of the image area and then transfer only the ink in the image area onto the paper. As a result, a printed matter is obtained.

Therefore, in order to obtain a good printed matter, it is important that the difference between the image portion and the non-image portion, that is, the difference between hydrophobicity and hydrophilicity is clear.

When the method of JP-A-55-69551 is applied to a lithographic printing material as it is, it is treated with a viscous developer containing a high molecular weight hydroxyethyl cellulose or the like to form a cellulose film on the surface, which is It is difficult to make a difference in hydrophilicity, and good printing characteristics cannot be obtained. Also, when using a viscous developing solution, you need to apply the solution from a pod, or put the solution between the plate material and developing paper, and then squeeze it with a roller to expand it. There is a problem that it is difficult to change the size freely.

On the other hand, in the negative type diffusion transfer method using an internal latent image type emulsion, since the processing is carried out in the presence of a silver halide solvent, rapid fogging development is required.
If the silver halide is dissolved before the fogging development is completed, a good reversal image cannot be obtained and a negative transferred silver image cannot be obtained. Therefore, it is important to devise a time difference between the fogging development and the dissolution of silver halide. Therefore, a fogging agent having strong nucleation activity is required, and a good nucleation accelerator that promotes nucleation is also desired. A method for performing such rapid development is particularly desired.

Further, EP481562A1 describes a lithographic printing material using a conversion type internal latent image type emulsion. And, in order to prevent the deterioration of reversal developability due to the silver halide solvent in the developing solution,
Using two kinds of developing solutions, a surface developing solution containing no silver halide solvent and a developing solution containing a silver halide solvent, first developing with the surface developing solution of the former, and then developing with the latter solvent. A method of diffusion transfer is described. Therefore, even in this system, it is desired to further improve the photographic characteristics and the printing characteristics.

From the above, various types of silver salt diffusion transfer methods can be applied as plate materials of any size. In any case, high sensitivity, stable processing and excellent printing characteristics are possible. It is desired to develop a lithographic printing material capable of obtaining a negative transfer silver image and capable of further rapid processing.

Among them, the method for obtaining a reversal image by an internal latent image type emulsion is known as described above, but in order to obtain a good reversal image, a silver bromide-based halogen composition is preferable. It is said that. However, with silver bromide-based emulsions, the development speed and transfer speed are low, and it is difficult to obtain a good reversal image with a developer containing a silver halide solvent that performs development and transfer development simultaneously (that is, good It is difficult to obtain a negative transfer image), and it is difficult to obtain a hard gradation, and it is strongly desired to solve these problems. Further, with silver bromide, printing durability and ink receptivity are not sufficient, and a method for improving these is desired.

[0013]

SUMMARY OF THE INVENTION An object of the present invention is to provide a lithographic printing material which obtains a negative transferred silver image by using a silver salt diffusion transfer method, and has high sensitivity, high resolution and printing durability. And excellent ink receptivity. Furthermore, it is possible to deal with a high-illuminance light source such as a laser beam of each wavelength and to deal with various processing systems.

[0014]

Such an object is achieved by the following constitutions (1) to (4). (1) In a lithographic printing material utilizing a silver salt diffusion transfer method having at least a silver halide emulsion layer and a physical development nucleus layer on a support, the silver halide emulsion is a core / shell type internal latent image type A lithographic printing material, which is an emulsion, wherein the composition of silver halide is substantially silver chlorobromide or silver chloride having a Br content of 50 mol% or less, to obtain a negative transfer silver image. (2) The lithographic printing material as described in (1) above, wherein the silver halide emulsion has a core surface chemically sensitized and has a crystal habit of a cube or an octahedron. (3) The lithographic printing material as described in (2) above, wherein the crystal habit is an octahedron. (4) Grain formation is carried out in the presence of one or more compounds among the compounds represented by the following chemical formulas 3 and 4, and the salt odor having an octahedral crystal habit and substantially having a Br content of 45 mol% or less. The lithographic printing material of (3) above, which is used to prepare a silver halide emulsion or a silver chloride emulsion.

[0015]

[Chemical 3]

[0016]

[Chemical 4]

[In Chemical Formula 3, A ₁ and A ₂ each represent a nonmetallic atom group necessary for completing the nitrogen-containing heterocycle, and each may be the same or different. B represents a divalent linking group. x represents 0 or 1. R ₅₁ and R
₅₂ each represents an alkyl group. X ₅ represents a monovalent anion. y represents the number required to balance the charge, and y is 0 when forming an intramolecular salt. In the chemical formula ₄ , A ₃ and A ₄ each represent a non-metal atom group necessary for completing the nitrogen-containing heterocycle, and each may be the same or different. B represents a divalent linking group. X ₅ represents a monovalent anion. y represents the number required to balance the charge, and y is 0 when forming an intramolecular salt. ]

[0018]

Specific Structure The specific structure of the present invention will be described in detail below.

The internal latent image type emulsion used in the present invention comprises core /
It is a shell-type emulsion in which the core surface is chemically sensitized.

In addition to the core / shell type, internal latent image type emulsions include British Patent No. 1011062 and US Pat. No. 259.
There are conversion types described in the respective specifications of No. 2250 and No. 2456943. The conversion type is slightly inferior to the core / shell type in inversion property, and there is a problem in pressure property such as sensitization of scratches, and a negative transfer image can be obtained, but the core / shell type is preferable.

The halogen composition of the emulsion of the present invention has a Br content of 50 mol% or less (that is, a Cl content of 5).
(0 mol% or more) silver chlorobromide or silver chloride, but 1 mol% or less of iodine may be contained.

In this case, the halogen distribution in the core / shell type particles is not particularly limited, and it is sufficient that the whole particles have the above halogen composition.

With such a halogen composition, photographic characteristics and printing characteristics are improved. If the Br content exceeds 50 mol%, sufficient photographic characteristics cannot be obtained, probably because development or transfer is delayed. In particular, when a developing solution containing a silver halide solvent is used, a good reversal image (negative transfer image) cannot be obtained, so that the photographic characteristics are likely to deteriorate. On the other hand, when the Br content exceeds 50 mol%, sufficient printing durability cannot be obtained and good printability cannot be obtained.

The crystal habit of the internal latent image type emulsion may be any of a cube, an octahedron, a tetrahedron, etc. in the core / shell type emulsion in which the core surface is chemically sensitized, and an octahedron or a cube is preferable. Further, an octahedron is preferable.

By making the crystal habit of the emulsion octahedral, the photographic characteristics and printing characteristics are further improved.

In the above halogen composition, in particular Br
The octahedron is more preferable as the content decreases and the silver chloride system is approached.

To obtain a predetermined crystal habit such as an octahedron or a cube, it is sufficient to change the conditions such as the temperature and the potential at the time of attaching the shell. The crystal habit of the core particles is not particularly limited and may be any.

In particular, the Br content is 45 mol% or less, particularly 3
When an octahedral one is obtained in a silver chlorobromide emulsion or a silver chloride emulsion containing 5 mol% or less, a bispyridinium salt described in JP-A-2-32 and a sensitizing dye described in U.S. Pat. No. 4,225,666. , The thiocyanates described in US Pat. No. 5,061,617 and the adenines and pyrimidines described in US Pat. Pyridinium salt (also called bipyridinium compound)
Is preferably used. This product does not have an adverse effect on color sensitization or chemical sensitization and has no adverse effect on printability.

The chemical formulas 3 and 4 will be described. In Chemical Formula 3 and Chemical Formula 4, A ₁ , A ₂ , A ₃ and A ₄ represent a non-metal atom group for completing the nitrogen-containing heterocycle, and may be the same or different. B represents a divalent linking group. Chemical 3
In, x represents 0 or 1, and R ₅₁ and R ₅₂ each represent an alkyl group. In Chemical Formula 3 and Chemical Formula 4, X ₅ represents a monovalent anion, y represents the number necessary for balancing charges, and y is 0 in the case of an inner salt.

The chemical formulas 3 and 4 will be described in more detail below.

A ₁ , A ₂ , A ₃ and A ₄ represent a non-metal atom group for completing the nitrogen-containing heterocycle, which may contain an oxygen atom, a nitrogen atom or a sulfur atom, and is condensed with a benzene ring. I don't care. The heterocyclic ring composed of A ₁ , A ₂ , A ₃ and A ₄ may have a substituent, and each may be the same or different. As the substituent, an alkyl group, an aryl group, an aralkyl group, an alkenyl group, a halogen atom, an acyl group, an alkoxycarbonyl group, an aryloxycarbonyl group, a sulfo group, a carboxy group, a hydroxy group, an alkoxy group, an aryloxy group, an amide group. , Sulfamoyl group, carbamoyl group, ureido group,
It represents an amino group, a sulfonyl group, a cyano group, a nitro group, a mercapto group, an alkylthio group and an arylthio group. As a preferred example, A ₁ , A ₂ , A ₃ and A ₄ are 5 to each other.
A 6-membered ring (for example, a pyridine ring, an imidazole ring, a thiozole ring, an oxazole ring, a pyrazine ring, a pyrimidine ring, etc.) can be mentioned, and a pyridine ring can be mentioned as a more preferable example.

B represents a divalent linking group. The divalent linking group means alkylene, arylene, alkenylene, -S
_{O 2 -, - SO -,} - O -, - S -, - CO -, - N
( _R53 )-( _R53 represents an alkyl group, an aryl group, or a hydrogen atom) is used alone or in combination. Preferred examples of B include alkylene and alkenylene. Further, in Chemical formula 3, it is also preferable that x is 0, that is, B is a simple bond.

R ₅₁ and R ₅₂ represent an alkyl group having 1 to 20 carbon atoms. R ₅₁ and R ₅₂ may be the same or different.

The alkyl group means a substituted or unsubstituted alkyl group, and the substituents are A ₁ , A ₂ , A ₃
And the same as the substituents mentioned as the substituent of A ₄ .

As a preferred example, R ₅₁ and R ₅₂ each represent an alkyl group having 4 to 10 carbon atoms. A further preferred example is a substituted or unsubstituted aryl-substituted alkyl group.

X ₅ represents a monovalent anion. For example,
Chlorine ion, bromine ion, iodine ion, nitrate ion,
Represents sulfate ion, p-toluene sulfonate, and oxalate. y represents the number required to balance the charge, and y is 0 in the case of an intramolecular salt.

Specific examples of the compounds represented by Chemical formulas 3 and 4 are listed below, but the present invention is not limited to these compounds.

[0038]

[Chemical 5]

[0039]

[Chemical 6]

[0040]

[Chemical 7]

[0041]

[Chemical 8]

[0042]

[Chemical 9]

[0043]

[Chemical 10]

[0044]

[Chemical 11]

[0045]

[Chemical 12]

[0046]

[Chemical 13]

[0047]

[Chemical 14]

Synthesis of the compounds of Chemical formulas 3 and 4 is described in JP-A-2-
No. 32 and the documents described therein can be used.

The compounds of Chemical formulas 3 and 4 may be used alone or in combination of two or more, and the addition amount is 5 per 1 mol of Ag.
It may be set to ^{x10 -1 to} 5x10 ^-4 mol.

The addition may be carried out at the time of shell attachment, and usually after the chemical sensitization of the core particles is completed.

In the present invention, the nucleating agent used in combination with the internal latent image type emulsion is preferably at least one of the compounds represented by Chemical formulas 15 and 16.

The "nucleating agent" as used in the present invention is a substance which acts when the surface development processing of the internal latent image type halogenated emulsion which has not been fogged in advance and directly forms a positive image.

[0053]

[Chemical 15]

[0054]

[Chemical 16]

In Chemical formula 15, Z ¹ represents a group of non-metal atoms necessary for forming a 5- or 6-membered heterocycle. An aromatic ring or a heterocycle may be further condensed with this heterocycle. R ¹ is an aliphatic group, and X is a group represented by Chemical formula 17 or Chemical formula 18. Q represents a 4- to 12-membered non-aromatic hydrocarbon ring or a non-metal atom group necessary for forming a non-aromatic heterocycle. However, at least one of the substituents of R ¹ and Z ^{1 and} the substituent of Q includes an alkynyl group. Further, at least one of R ¹ , Z ¹ and Q may have an adsorption promoting group for silver halide. Y
Is a counter ion for charge balance, and n is the number required for charge balance.

[0056]

[Chemical 17]

[0057]

[Chemical 18]

In the chemical formula 16, R ²¹ represents an aliphatic group, an aromatic group, or a heterocyclic group. R ²² represents a hydrogen atom, an alkyl group, an aralkyl group, an aryl group, an alkoxy group, an aryloxy group, or an amino group. G represents a carbonyl group, a sulfonyl group, a sulfoxy group, a phosphoryl group, or an iminomethylene group represented by Chemical formula 19, and R ²³ and R
²⁴ is both a hydrogen atom, or one is a hydrogen atom and the other is any one of an alkylsulfonyl group, an arylsulfonyl group and an acyl group. However, G, R ²³ , R
The hydrazone structure of Formula 20 may be formed by including ²⁴ and the hydrazine nitrogen. Further, the above-mentioned groups may be substituted with a substituent, if possible.

[0059]

[Chemical 19]

[0060]

[Chemical 20]

The nucleating agent represented by Chemical formula 15 will be described in more detail. Examples of the heterocycle completed by Z ¹ include quinolinium, benzimidazolium, pyridium, thiazolium, selenazolium, imidazolium, tetrazolium, indolenium, pyrrolinium, Examples include phenanthridinium, isoquinolinium, or naphthopyridium nuclei. Z ¹ may be substituted with a substituent, and as the substituent, an alkyl group, an alkenyl group,
Aralkyl group, aryl group, alkynyl group, hydroxy group, alkoxy group, aryloxy group, halogen atom,
Amino group, alkylthio group, arylthio group, acyloxy group, acylamino group, sulfonyl group, sulfonyloxy group, sulfonylamino group, carboxyl group, acyl group, carbamoyl group, sulfamoyl group, sulfo group, cyano group, ureido group, urethane group, Examples thereof include a carbonic acid ester group, a hydrazine group, a hydrazone group, and an imino group. As the substituent of Z ¹ , for example, at least one is selected from the above-mentioned substituents, but when there are two or more, they may be the same or different. Further, the above substituents may be further substituted with these substituents.

[0062] As further substituents of Z ^1, may have a heterocyclic quaternary ammonium group completed by Z ¹ via a suitable linking group L ¹ (described later). In this case, a so-called dimer structure is adopted.

The heterocyclic nucleus completed with Z ¹ is preferably a quinolinium, benzimidazolium, pyridinium, acridinium, phenanthridinium, naphthopyridinium or isoquinolinium nucleus. More preferably, quinolinium, naphthopyridinium,
It is a benzimidazolium nucleus, most preferably a quinolinium nucleus.

The aliphatic group represented by R ¹ preferably has 1 to 1 carbon atoms.
It is an unsubstituted alkyl group having 18 carbon atoms and a substituted alkyl group having 1 to 18 carbon atoms in the alkyl moiety. Examples of the substituent include those described as the substituent for Z ¹ . R ¹
Is preferably an alkynyl group, and most preferably a propargyl group.

Q is a group of atoms necessary for forming a 4- to 12-membered non-aromatic hydrocarbon ring or non-aromatic heterocycle. These rings may be further substituted with the groups described for the Z ¹ substituent.

As the non-aromatic hydrocarbon ring, when X is a carbon atom, examples thereof include rings such as cyclopentane, cyclohexane, cyclohexene, cycloheptane, indane and tetralin.

The non-aromatic heterocycle includes nitrogen, oxygen, sulfur, selenium and the like as a hetero atom,
For example, when X is a carbon atom, examples thereof include rings such as tetrahydrofuran, tetrahydropyran, butyrolactone, pyrrolidone, and tetrahydrothiophene. When X is a nitrogen atom, examples thereof include rings such as pyrrolidine, piperidine, pyridone, piperazine, perhydrothiazine, tetrahydroquinoline and indoline.

Preferred as the ring nucleus formed by Q is
When X is a carbon atom, it is, in particular, cyclopentane, cyclohexane, cycloheptane, cyclohexeneindane, tetrahydropyran, tetrahydrothiophene and the like.

As the alkynyl group to which at least one of the substituents of R ¹ and Z ^{1 and} the substituent of Q corresponds, some of them have been already described. The number is from 2 to 18, and examples thereof include an ethynyl group, a propargyl group, a 2-butynyl group, a 1-methylpropargyl group, a 1,1-dimethylpropargyl group, a 3-butynyl group, and a 4-pentynyl group.

Further, these may be substituted with the groups described as the substituent for Z ¹ . The alkynyl group is preferably a propargyl group, and most preferably R ¹ is a propargyl group.

Examples of the adsorption promoting group to silver halide which the substituents of R ¹ , Q and Z ¹ may have are X ^1- (L ¹ ) _m1
Those represented by − are preferable.

Here, X ¹ is an adsorption promoting group to silver halide, and L ¹ is a divalent linking group. m ₁ is 0 or 1
Is. Preferred examples of the adsorption accelerating group for silver halide represented by X ¹ include a thioamide group, a mercapto group and a 5- or 6-membered nitrogen-containing heterocyclic group.

These may be substituted with those mentioned as the substituent for Z ¹ . The thioamide group is preferably an acyclic thioamide group (eg, thiourethane group, thioureido group, etc.).

The mercapto group for X ¹ is particularly a heterocyclic mercapto group (eg 5-mercaptotetrazole, 3
-Mercapto-1,2,4-triazole), 2-mercapto-1,3,4-thiadiazole, 2-mercapto-1,3,4-oxadiazole and the like) are preferable.

The 5- or 6-membered nitrogen-containing heterocycle represented by X ¹ is a combination of nitrogen, oxygen, sulfur and carbon, and preferably forms imino silver, such as benzotriazole or aminothiazole. Can be mentioned.

The divalent linking group represented by L ¹ is
An atom or an atomic group containing at least one of C, N, S, and O. Specifically, for example, an alkylene group, an alkenylene group, an alkynylene group, an arylene group, -O-,
-S -, - NH -, - N =, - CO -, - SO 2 - ( may have these groups the substituents), is made of a single or a combination thereof and the like. As an example of the combination, those shown in Chemical formula 21 are preferable.

[0077]

[Chemical 21]

Examples of the counter ion Y for charge balance include bromine ion, chlorine ion, iodine ion, p
-Toluenesulfonate ion, ethylsulfonate ion, perchlorate ion, trifluoromethanesulfonate ion, thiocyan ion, BF ₄ ⁻ , PF ₆ ^{− and the} like can be mentioned.

Of the compounds represented by Chemical formula 15, those having an adsorption promoting group for silver halide are preferable.
In particular, the adsorption promoting group X ¹ is more preferably a thioamide group, an azole group or a heterocyclic mercapto group. Examples of these compounds and their synthesis methods are described in, for example, JP-A-63-301942 and the patents or literatures cited therein.

Specific examples of the compound represented by Chemical formula 15 are shown below, but the present invention is not limited thereto.

[0081]

[Chemical formula 22]

[0082]

[Chemical formula 23]

[0083]

[Chemical formula 24]

[0084]

[Chemical 25]

[0085]

[Chemical formula 26]

[0086]

[Chemical 27]

The compounds described above are, for example, Research Disclosure No. 22.
534 (published January 1983, pp. 50-54), and methods described in US Pat. No. 4,471,044 and the like and similar methods.

Next, the chemical formula 16 will be described in detail. In Chemical formula 16, the aliphatic group represented by R ²¹ is a linear, branched or cyclic alkyl group, alkenyl group or alkynyl group.

The aromatic group represented by R ²¹ is a monocyclic or bicyclic aryl group, and examples thereof include a phenyl group and a naphthyl group.

The heterocycle of R ²¹ is N, O, or S
It is a 3- to 10-membered saturated or unsaturated heterocycle containing at least one of the atoms, which may be a monocycle or may form a condensed ring with another aromatic ring or heterocycle. Good. The heterocycle (also referred to as a heterocycle) is preferably a 5- or 6-membered aromatic heterocyclic group, and examples thereof include a pyridyl group, a quinolinyl group, an imidazolyl group, and a benzimidazolyl group.

R ²¹ may be substituted with a substituent. Examples of the substituent include the followings. These groups may be further substituted.

For example, alkyl group, aralkyl group, alkoxy group, alkyl or aryl group, substituted amino group, acylamino group, sulfonylamino group, ureido group, urethane group, aryloxy group, sulfamoyl group, carbamoyl group, aryl group, alkylthio group. Group, arylthio group, sulfonyl group, sulfinyl group, hydroxy group, halogen atom, cyano group, sulfo group and carboxyl group. When possible, these groups may be linked to each other to form a ring.

R ²¹ is preferably an aromatic group, an aromatic heterocycle or an aryl-substituted methyl group, more preferably an aryl group.

Preferred among the groups represented by R ²² are:
When G is a carbonyl group, a hydrogen atom, an alkyl group (eg, methyl group, trifluoromethyl group, 3-hydroxypropyl group, 3-methanesulfonamidopropyl group, etc.), aralkyl group (eg, o-hydroxybenzyl group, etc.) ), An aryl group (for example, a phenyl group, a 3,5-dichlorophenyl group, an o-methanesulfonamidophenyl group, a 4-methanesulfonylphenyl group, etc.), and a hydrogen atom is particularly preferable.

When G is a sulfonyl group, R ²² is an alkyl group (eg methyl group), an aralkyl group (eg o-hydroxyphenylmethyl group), an aryl group (eg phenyl group) or a substituted amino group. (For example, a dimethylamino group etc.) and the like are preferable.

As the substituent for R ^22, the substituents listed for R ²¹ can be applied, and for example, an acyl group, an acyloxy group, an alkyl or aryloxycarbonyl group, an alkenyl group, an alkynyl group, a nitro group, etc. can also be applied.

These substituents may be further substituted with these substituents. If possible, these groups may be linked to each other to form a ring.

R ²¹ or R ²² , especially R ²¹ , preferably contains a non-diffusion group such as a coupler, a so-called ballast group. This ballast group has 8 or more carbon atoms, and is an alkyl group, phenyl group, ether group, amide group, ureido group,
It is composed of one or more combinations of urethane group, sulfonamide group, thioether group and the like.

R ²¹ or R ²² may have a group X ² — (L ² ) _m ² — which promotes adsorption of the compound represented by Chemical formula 16 onto the surface of silver halide grains. X ² here
Has the same meaning as X ¹ in Chemical formula 15, and is preferably a thioamide group (excluding thiosemicarbazide and its substitution product), a mercapto group, or a 5- to 6-membered nitrogen-containing heterocyclic group. L ² represents a divalent linking group and has the same meaning as L ¹ in Chemical formula 15. m ₂ is 0 or 1.

More preferred X ² is a cyclic thioamide group (that is, a mercapto-substituted nitrogen-containing heterocycle, for example, 2-mercaptothiadiazole group, 3-mercapto-group).
1,2,4-triazole group, 5-mercaptotetrazole group, 2-mercapto-1,3,4-oxadiazole group, 2-mercaptobenzoxazole group, etc.) or nitrogen-containing heterocyclic group (for example, benzotriazole) Group, benzimidazole group, indazole group, etc.).

A hydrogen atom is most preferable as R ²³ and R ²⁴ . As G in Chemical formula 16, a carbonyl group is most preferable.
Further, as Chemical formula 16, those having an adsorption group to silver halide are more preferable. Particularly preferable adsorbing groups on silver halide are the mercapto group, the cyclic thioamide group and the nitrogen-containing heterocyclic group described in Chemical formula 15 above.

Specific examples of the compound represented by Chemical formula 16 are shown below. However, the present invention is not limited to the following compounds.

[0103]

[Chemical 28]

[0104]

[Chemical 29]

[0105]

[Chemical 30]

[0106]

[Chemical 31]

[0107]

[Chemical 32]

[0108]

[Chemical 33]

The method for synthesizing the compound represented by Chemical formula 16 used in the present invention is described in, for example, Research Disclosure magazine No. 15162 (November 1976, pp. 76-77), 22534 (January 1983). 50-54), and the same magazine, 23510 (198).
3rd November, pp. 346-352) and U.S. Pat. Nos. 4,080,207 and 4,269,924.
No. 4,276,364 and the like.

In the present invention, any of the compounds represented by Chemical formulas 15 and 16 may be contained in the photographic light-sensitive material, but any layer may be contained, but it is preferably contained in the silver halide emulsion layer. There is no particular limit to the amount used,
A useful range is from about 1.times.10.sup.- ⁸ mol to about 1.times.10.sup.- ² mol per mol of silver in the silver halide emulsion layer, preferably 1 mol of silver.
It is 1 × 10 ⁻⁷ to 1 × 10 ⁻³ mol per mol.

These compounds may be used alone or in combination of two or more kinds, and the total amount of the compounds used in combination may be within the above range.

In the present invention, it is preferable to use the nucleating agent represented by Chemical formula 15, and the following (1) to
It is particularly preferable to take the modes shown in the order of (8),
The case of (8) is most preferable.

(1) In the case where it has a group promoting adsorption to silver halide represented by X ¹ as a substituent.

(2) In the above (1), the adsorption promoting group represented by X ¹ on the silver halide is a thioamide group, a heterocyclic mercapto group, or a nitrogen-containing heterocycle which produces iminosilver.

(3) In the above (2), the heterocycle completed by Z is quinolinium, isoquinolinium, naphthopyridinium or penzothiazolium.

(4) In the above (2), the heterocycle completed by Z is quinolinium.

(5) In the above (2), R ¹ has an alkynyl group as a substituent of Z.

(6) In the above (5), R ¹ is a propargyl group.

(7) In the above (2), the thioamide group of X ¹ is thiourethane group, and the heterocyclic mercapto group of X ¹ is mercaptotetrazole.

(8) In the above (6), R ¹ is bonded to the heterocycle completed by Z to form a ring.

Further, when the nucleating agent represented by Chemical formula 16 is used, it is particularly preferable that the following modes (1) to (6) are adopted, and the case (6) is most preferable.

(1) In the case of having an adsorption promoting group for silver halide represented by X ² as a substituent.

(2) In the above (1), the adsorption promoting group represented by X ² on the silver halide is a heterocyclic mercapto group or a nitrogen-containing heterocyclic ring forming imino silver.

(3) In the above (2), the group represented by GR ²² is a formyl group.

(4) In the above (3), R ²³ and R
^{When 24} is a hydrogen atom.

(5) In the above (3), R ²¹ is an aromatic group.

(6) In the above (2), the heterocyclic mercapto group represented by X ² is 5-mercaptotetrazole or 5-mercapto-1,2,4-triazole.

In the present invention, the compound of Chemical formula 15 and the compound of Chemical formula 16 can be used in combination.

As the nucleating agent, all compounds conventionally developed for the purpose of nucleating an inner latent type silver halide are applicable. Two or more nucleating agents may be used in combination as described above. More specifically, as the nucleating agent,
For example, “Research Date Closure” (Resarch Di
sclosure) No. 22534 (January 50, 1983)
Page 54), and these are roughly classified into three types: hydrazine compounds, quaternary heterocyclic compounds, and other compounds.

The nucleating agent of Chemical formula 15 can be classified as a quaternary heterocyclic compound, and the nucleating agent of Chemical formula 16 includes a hydrazine compound.

Examples of the hydrazine compound include, for example, Research Disclosure N.
15162 (November 1976, pp. 76-77) and the same magazine 23510 (November 1983, 346-).
Those described on page 352). More specific examples include those described in the following patent specifications. First, examples of the hydrazine-based nucleating agent having a silver halide adsorptive group include, for example, US Pat. No. 40309.
No. 25, No. 4080207, No. 4031127.
Nos. 3,718,470, 4,269,929, 4,276,364, 4,287,748, and 43.
No. 85108, No. 4459347, and British Patent No. 20.
11391B, JP-A-54-74729, and JP-A-55-
163533, 55-74536 and 60-
179734 etc. are mentioned. Examples of other hydrazine-based nucleating agents include, for example, JP-A-57 / 57
-86829, U.S. Pat. Nos. 4,560,638 and 4,
No. 478, and further No. 2563785 and No. 2
The compound described in 588,982 may be mentioned.

Examples of the quaternary heterocyclic compound include the above-mentioned Research Disclosure (Resarch Disclosur).
e) Magazine No. 22534, JP-B-49-38164, JP-A-52-19452, JP-A-52-47326, JP-A-5-52
2-69613, 52-3426, 55-13
8742, 60-11837, U.S. Pat. No. 430
No. 6016 and "Research Disclosure"
Magazine No. 23213 (issued in August 1983, 267-27)
Those described on page 0).

In the present invention, the nucleating agents of Chemical formulas 15 and 16 can be used in combination with the other nucleating agents described therein. In the present invention, it is particularly preferable to use the nucleating agent of Chemical formula 15.

In the present invention, it is preferable to use a nucleating agent together with a nucleating agent. The "nucleating accelerator" in the present invention does not substantially function as the nucleating agent, but it promotes the action of the nucleating agent to directly increase the maximum density of a positive image and / or has a certain level. It is a substance that acts to accelerate the development time required to directly obtain a positive image density. The nucleation accelerator useful in the present invention is represented by Chemical formula 34.

[0135]

[Chemical 34]

In Chemical Formula 34, A represents a group adsorbing to silver halide. Examples of the group adsorbed on the silver halide include a compound having a mercapto group bonded to a heterocycle, a heterocyclic compound capable of forming imino silver, or a hydrocarbon compound having a mercapto group.

Examples of the mercapto compound bonded to the heterocycle include, for example, substituted or unsubstituted mercaptoazoles (for example, 5-mercaptotetrazole, 3-mercapto-1,2,4-triazoles, 2-mercaptoimidazoles). , 2-mercapto-1,3,4-thiadiazoles, 5-mercapto-1,2,4-thiadiazoles, 2-mercapto-1,3,4-oxadiazoles, 2-mercapto-1,3, 4-selenadiazoles, 2-mercaptooxazoles, 2-mercaptothiazoles, 2-mercaptobenzoxazoles, 2
-Mercaptobenzimidazoles, 2-mercaptobenzthiazoles, etc.) substituted or unsubstituted mercaptopyrimidines (e.g., 2-mercaptopyrimidines,
Etc.) and the like.

Examples of the heterocyclic compound capable of forming imino silver include substituted or unsubstituted indazoles, benzimidazoles, benzotriazoles, benzoxazoles, benzthiazoles, imidazoles, thiazoles, oxazoles, Triazoles, tetrazoles, azaindenes, pyrazoles,
Examples include indoles.

Examples of the hydrocarbon compound having a mercapto group include alkyl mercaptoptans, aryl mercaptans, alkenyl mercaptans and aralkyl mercaptans.

Y ¹ represents a divalent linking group consisting of an atom or a group of atoms selected from a hydrogen atom, a carbon atom, a nitrogen atom, an oxygen atom and a sulfur atom. Examples of the divalent linking group include those shown in Chemical formula 35.

[0141]

[Chemical 35]

These linking groups are linear or branched alkylene groups between A and the heterocyclic ring described later (for example, methylene group, ethylene group, propylene group, butylene group, hexylene group, 1-methylethylene group, etc.). Alternatively, it may be bonded via a substituted or unsubstituted arylene group (phenylene group, naphthylene group, etc.).

R ³¹ , R ³² , R ³³ , R ³⁴ , R ³⁵ , R ³⁶ , R
³⁷ , R ³⁸ , R ³⁹ and R ⁴⁰ are each a hydrogen atom, a substituted or unsubstituted alkyl group (for example, a methyl group, an ethyl group, a propyl group, an n-butyl group, etc.), a substituted or unsubstituted aryl group ( For example, phenyl group, 2-methylphenyl group, etc.), substituted or unsubstituted alkenyl group (eg, propenyl group, 1-methylvinyl group, etc.),
Alternatively, it represents a substituted or unsubstituted alkyl group (eg, benzyl group, phenethyl group, etc.).

R represents an organic group containing at least one thioether group, amino group (including salt form), ammonium group, ether group or heterocyclic group (including salt form).
Examples of such an organic group include a group in which a group selected from a substituted or unsubstituted alkyl group, an alkenyl group, an aralkyl group or an aryl group and the above group are combined, and a combination of these groups Good. For example, dimethylaminoethyl group, aminoethyl group, diethylaminoethyl group, dibutylaminoethyl group, dimethylaminopropyl group hydrochloride, dimethylaminoethylthioethyl group, 4-dimethylaminophenyl group, 4-dimethylaminobenzyl group, methylthioethyl group. Group, ethylthiopropyl group, 4-methylthio-3-cyanophenyl group, methylthiomethyl group, trimethylammonioethyl group, methoxyethyl group, methoxyethoxyethoxyethyl group, methoxyethylthioethyl group, 3,4-dimethoxyphenyl group , 3-chloro-4-methoxyphenyl group, morpholinoethyl group, 1-imidazolylethyl group, morpholinoethylthioethyl group, pyrrolidinoethyl group, piperidinopropyl group, 2-pyridylmethyl group, 2- (1-imidazolyl ) Echi Thioethyl group, pyrazolylethyl group, triazolyl an ethyl group, and a methoxyethoxy ethoxyethoxycarbonyl aminoethyl group. s represents 0 or 1, and t represents 1 or 2.

Among the compounds represented by Chemical formula 34, preferred compounds are represented by Chemical formulas 36 to 41.

[0146]

[Chemical 36]

[0147]

[Chemical 37]

[0148]

[Chemical 38]

[0149]

[Chemical Formula 39]

[0150]

[Chemical 40]

[0151]

[Chemical 41]

In the formula 36, Q ¹ is preferably an atom necessary for forming a 5- or 6-membered heterocyclic ring composed of at least one atom of carbon atom, nitrogen atom, oxygen atom, sulfur atom and selenium atom. Represents a group. The heterocycle may be fused with a carbon aromatic ring or a heteroaromatic ring.

Examples of the heterocycle include tetrazoles,
Triazoles, imidazoles, thiadiazoles,
Examples thereof include oxadiazoles, selenadiazoles, oxazoles, thiazoles, benzoxazoles, benzthiazoles, benzimidazoles and pyrimidines.

M represents a hydrogen atom, an alkali metal atom (eg, sodium atom, potassium atom, etc.), an ammonium group (eg, trimethylammonium group, dimethylbenzylammonium group, etc.), M = H or an alkali metal atom under alkaline conditions. Group (for example, an acetyl group,
Cyanoethyl group, methanesulfonylethyl group, etc.).

Further, these heterocycles include a nitro group, a halogen atom (eg chlorine atom, bromine atom, etc.), a mercapto group, a cyano group, and a substituted or unsubstituted alkyl group (eg methyl group, ethyl group, propyl group). , T-butyl group, cyanoethyl group, etc.), aryl group (for example, phenyl group, 4-methanesulfonamidophenyl group, 4-
Methylphenyl group, 3,4-dichlorophenyl group, naphthyl group, etc.), alkenyl group (eg allyl group, etc.) aralkyl group (eg benzyl group, 4-methylbenzyl group, phenethyl group, etc.), sulfonyl group ( For example, methanesulfonyl group, ethanesulfonyl group, p-toluenesulfonyl group, etc.), carbamoyl group (eg, unsubstituted carbamoyl group, methylcarbamoyl group, phenylcarbamoyl group, etc.), sulfamoyl group (eg, unsubstituted sulfamoyl group, methylsulfamoyl group, etc.). Moyl group, phenylsulfamoyl group, etc.), carbonamide group (eg, acetamide group, benzamide group, etc.), sulfonamide group (eg, methanesulfonamide group, benzenesulfonamide group, p-toluenesulfonamide group, etc.) , Acyloxy groups (eg acetyl Alkoxy group, benzoyloxy group,
Etc.), sulfonyloxy group (eg methanesulfonyloxy group, etc.), ureido group (eg unsubstituted ureido group, methylureido group, ethylureido group, phenylureido group, etc.), thioureido group (eg unsubstituted thioureido group, etc.) , Methylthioureido group, etc.), acyl group (eg acetyl group, benzoyl group, etc.), oxycarbonyl group (eg methoxycarbonyl group, phenoxycarbonyl group, etc.), oxycarbonylamino group (eg methoxycarbonylamino group, phenoxycarbonyl) Amino group, 2-ethylhexyloxylcarbonylamino group, etc.), carboxylic acid or a salt thereof, sulfonic acid or a salt thereof, which may be substituted with a hydroxyl group, a carboxylic acid or a salt thereof, a sulfonic acid or a salt thereof, Substitute with hydroxyl group It is preferable in terms of nucleation accelerating effect that is not.

Preferred examples of the heterocycle represented by Q ¹ include tetrazoles, triazoles, imidazoles, thiadiazoles and oxadiazoles. Y ¹ , R, t, and s each have the same meaning as in Chemical formula 34.

In the chemical formula 37, Y ¹ , R, t, s and M have the same meanings as those of the chemical formulas 34 and 36, and Q ² is a 5- or 6-membered heterocycle which can be formed with iminosilver. Represents the atomic group necessary for. Preferably, it represents an atomic group necessary for forming a 5- or 6-membered heterocyclic ring selected from carbon, nitrogen, oxygen, sulfur and selenium. Also, this heterocycle may be fused as a carbon aromatic or heteroaromatic ring. Q ²
The heterocycle formed by, for example, indazoles, benzimidazoles, benzotriazoles,
Examples thereof include benzoxazoles, benzthiazoles, imidazoles, thiazoles, oxazoles, triazoles, tetrazoles, tetraazaindenes, triazaindenes, diazaindenes, pyrazoles and indoles.

In Chemical Formula 38, M, R, Y ¹ and s are Chemical Formula 3
It is synonymous with that of 6. X ⁵ represents an oxygen atom, a sulfur atom or a selenium atom, preferably a sulfur atom.

In Chemical Formula 39, R ¹⁰ is a hydrogen atom, a halogen atom (eg, chlorine atom, bromine atom, etc.), a nitro group, a mercapto group, an unsubstituted amino group, a substituted or unsubstituted alkyl group (eg, methyl group). , Ethyl group,
Etc.), alkenyl group (eg, propenyl group, 1-methylvinyl group, etc.), aralkyl group (eg, benzyl group, phenethyl group, etc.), aryl group (eg, phenyl group, 2-methylphenyl group, etc.), Or- (Y ¹ ) _s
Represents -R. R ²⁰ is a hydrogen atom, an unsubstituted amino group or - (Y ¹⁾ represents _s -R, R ¹⁰ and R ²⁰ is - (Y ¹⁾ _s
When representing -R, they may be the same or different from each other. However, at least one of R ¹⁰ and R ²⁰ is-
(Y ¹ ) _s- R. M, R, Y ¹ and s each have the same meaning as in Chemical formula 36.

In Chemical Formula 40, R ³⁰ is-(Y ¹ ) _s -R
Represents However, M, R, Y ¹ and s are each
Is synonymous with each.

In Chemical Formula 41, R ¹¹ and R ¹² are each a hydrogen atom, a halogen atom (eg, chlorine atom, bromine atom,
Etc.), a substituted or unsubstituted amino group (for example, an unsubstituted amino group, a methylamino group, etc.), a nitro group, a substituted or unsubstituted alkyl group (for example, a methyl group, an ethyl group, etc.), an alkenyl group ( For example, a propenyl group,
1-methylvinyl group, etc.), aralkyl group (eg, benzyl group, phenethyl group, etc.) or aryl group (eg, phenyl group, 2-methylphenyl group, etc.).
M and R ³⁰ have the same meanings as those of formula 40, respectively.

Specific compounds represented by Chemical Formula 34 of the present invention are shown below, but the compounds of the present invention are not limited to these.

[0163]

[Chemical 42]

[0164]

[Chemical 43]

[0165]

[Chemical 44]

[0166]

[Chemical formula 45]

[0167]

[Chemical formula 46]

[0168]

[Chemical 47]

[0169]

[Chemical 48]

[0170]

[Chemical 49]

[0171]

[Chemical 50]

[0172]

[Chemical 51]

The nucleation promoter used in the present invention is Berichte der Deutschen Chemischen Gesellschaf.
t) 28 , 77 (1895), JP-A-50-37436.
No. 51-3231, U.S. Pat. No. 3,295,976.
U.S. Pat. No. 3,376,310, Berichte der Germany Chien Hemitschien Gezershyaft.
der Deutschen Chemischen Gesellschaft) 22 , 56
8 (1889), ibid. 29 , 2483 (1896), Journal of Chemical Society (J. Chem. So
c.) 1932 , 1806, Journal of the American Chemical Society (J. Am. Chem. So
c.) 71 , 4000 (1949), US Pat. No. 258.
5388, 2541924, Advances in Heterocyclic Chemistry (Advances in
Heterocyclic Chemistry) 9 , 165 (1968), Organic Synthesis IV, 5
69 (1963), Journal of the American Chemical Society (J. Am. Chem. Soc.) 4
5, 2390 (1923), Chemie Berichte (Chem
ische Berichte) 9, 465 (1876), Japanese Patent Publication Sho 40
-28496, JP-A-50-89034, U.S. Pat. Nos. 3,106,467, 3,420,670 and 22,71.
No. 229, No. 3137578, No. 3148066,
No. 3511663, No. 3060028, No. 3271
No. 154, No. 3251691, No. 3598599,
No. 3,148,066, Japanese Patent Publication No. 43-4135, U.S. Pat. Nos. 3,615,616, 3,420,664 and 307.
No. 1465, No. 2444605, No. 2444606
No. 2444607, No. 2935404, Japanese Patent Application No. 62-145932, and the like.

The nucleation accelerator can be contained in the lithographic printing material or in the processing liquid, and it is contained in the light-sensitive material, especially in the internal latent image type silver halide emulsion layer or other hydrophilic colloid layer (intermediate layer). Layer or protective layer). Particularly preferred is in a silver halide emulsion or its adjacent layer.

The addition amount of the nucleation accelerator is preferably 10 ^-6 to 10 ^-2 mol, and more preferably 10 ^-5 to 10 ^-2 mol, per mol of silver halide.

[0176] In addition, nucleation accelerator treatment liquid, i.e. the developer or per liter of 10 ^-8 to 10 ^-3 mol thereof preferably when added to the preceding bath, further preferably 10 ^-7 to 10 ^{- 4} mol.

In order to further enhance the effect of the nucleation accelerator of the present invention, it is preferable to use the following compounds in combination.

Hydroquinones (eg US Pat. No. 32
Compounds described in 27552 and 4279987; chromans (for example, US Pat. No. 4,268,621, JP-A-5).
4-103031, Research Disclosure 18
No. 264 (1979); quinones (for example, Research Disclosure 21206 (1)
981); aminos (for example, compounds described in U.S. Pat. No. 4,150,993 and JP-A-58-174757); oxidizing agents (for example, compounds described in Research Disclosure 16936 (1978)); catechol. (For example, JP-A-55-21013 and 55
-65944); compounds that release nucleating agents during development (e.g., compounds described in JP-A-60-107029); thioureas (e.g., JP-A-60-95533).
Compounds described in JP-A No. 55-65944);

The non-pre-fogged internal latent image type silver halide emulsions used in the present invention are those in which the surfaces of silver halide grains are not pre-fogged but are slightly fogged, and the latent image is mainly formed in the grains. The emulsion containing silver halide to be formed therein is, more specifically, a silver halide emulsion is coated on a transparent support in a fixed amount, and this is fixed for 0.01 to 10 seconds. When exposed to light and developed in the following developer A (internal type developer) at 20 ° C. for 6 minutes, the maximum density measured by the usual photographic density measuring method was the same amount as above, and the halogen was similarly exposed. The silver halide emulsion is placed in the following developer B (surface type developer) at 18 ° C.
Those having a density at least 5 times higher than the maximum density obtained when developed for 5 minutes are preferable, and those having a density at least 10 times higher are more preferable.

Surface developer B Metol 2.5 g L-ascorbic acid 10 g NaBO ₂ .4H ₂ O 35 g KBr 1 g Water was added to 1 liter

Internal developer A Metol 2 g Sodium sulfite (anhydrous) 90 g Hydroquinone 8 g Sodium carbonate (monohydrate) 52.5 g KBr 5 g KI 0.5 g Water was added to 1 liter

Specific examples of the internal latent image type emulsion include, for example, British Patent No. 1011062 and US Patent No. 259225.
The core / shell type silver halide emulsions described in No. 0 and No. 2456943 can be mentioned.
A core / shell type silver halide emulsion is disclosed in JP-A-47 / 47.
No. 32813, No. 47-32814, No. 52-13.
No. 4721, No. 52-156614, No. 53-602
No. 22, No. 53-66218, No. 53-66727.
No. 55-127549, No. 57-136641.
No. 58-70221, No. 59-208540,
59-216136, 60-107641, 60-247237, 61-2148, 61-.
No. 3137, Japanese Patent Publication No. 56-18939, No. 58-14
No. 12, No. 58-1415, No. 58-6935, No. 58-108528, Japanese Patent Application No. 61-36424, U.S. Pat. No. 3,206,313, No. 3317322, No. 3;
761266, 3761276, and 385063.
No. 7, No. 3923513, No. 4035185, No. 4
395478, 4504570, European Patent 0017148, Research Disclosure RD
The emulsions described in No. 16345 (November 1977) and the like can be mentioned. Among these emulsions, the above-mentioned ones may be selected and used.

The average grain size of silver halide grains (in the case of spherical grains or grains close to spheres, the grain size in the case of cubic grains is defined as the grain size, and the average is based on the projected area) is 2 μm or less. 0.1 μ or more is preferable, but 1 μ or less and 0.15 μ or more is particularly preferable. The particle size distribution may be narrow or wide, but within the range of ± 40% of the average particle size in terms of the number of particles or the weight (more preferably, in order to improve graininess and sharpness).
A so-called "monodisperse" silver halide emulsion having a narrow grain size distribution such that 90% or more, particularly 95% or more of all grains fall within ± 30%, most preferably within ± 20% is used in the present invention. Is preferred. In order to satisfy the target gradation of a lithographic printing material as a light-sensitive material, two or more kinds of monodispersed silver halide emulsions having the same grain size or the same size, or emulsions having substantially the same color sensitivity are used. It is possible to mix a plurality of particles having different sensitivities in the same layer or to coat multiple layers in different layers. Further, two or more kinds of polydisperse silver halide emulsions or a combination of monodisperse emulsions and polydisperse emulsions can be mixed or laminated and used.

The silver halide emulsion used in the present invention is
It can be prepared in the presence of a silver halide solvent. As the silver halide solvent, there are U.S. Pat. No. 3,271,157.
No. 3,531,289, No. 3,574,628, JP-A Nos. 54-1019, 54-158917 and the like, JP-A No. 53-82408.
Nos. 55-77737 and 55-2982. The emulsion of the present invention can be doped with metals such as Ir, Rh, Ru, Pd, Pt, Pb and Fe during grain formation. The silver halide emulsion used in the present invention can be chemically sensitized inside or on the surface of the grain by sulfur or selenium sensitization, reduction sensitization, noble metal sensitization or the like alone or in combination.

To the lithographic printing material of the present invention, a sensitizing dye (for example, cyanine dye, merocyanine dye, etc.) described in JP-A-55-52050, pages 45 to 53, may be added for the purpose of increasing sensitivity. You can

These sensitizing dyes may be used alone or in combination, and the combination of sensitizing dyes is often used especially for the purpose of supersensitization. Along with the sensitizing dye, a dye having no spectral sensitizing effect itself or a substance that does not substantially absorb visible light and exhibits supersensitization may be included in the emulsion.

[0187] Useful sensitizing dyes, combinations of dyes exhibiting supersensitization and substances exhibiting supersensitization are described in
Research Disclosure Volume 176 1
7643 (issued in December 1978) Page 23 IV IV
It is described in the section.

Here, the sensitizing dye or the like can be added to any step of the process for producing a photographic emulsion and used.
It can be added at any stage after production until immediately before coating. Examples of the former include grain formation, physical ripening, and chemical ripening.

The sensitizing dyes used in the present invention include ortho-sensitizing dyes, panchromatic sensitizing dyes, and infrared sensitizing dyes for ordinary high-illuminance such as tungsten light source, Ar, He-Ne, and semiconductor laser. It can be used according to the light source.

As the sensitizing dyes, those of Chemical Formulas 52 and 53 are preferably used.

[0191]

[Chemical 52]

[0192]

[Chemical 53]

The chemical formula 52 will be described. In Chemical Formula 52, Z
₁₁ and Z ₁₂ may be the same or different, and 5
Or 6-membered nitrogen-containing heterocyclic nucleus forming atomic group, and u represents 0 or 1.

R ₁₁ and R _{12, which} may be the same or different, each represents an optionally substituted alkyl group or alkenyl group having 10 or less carbon atoms.

R ₁₃ and R ₁₅ each represent a hydrogen atom. Also, R ₁₃ and R _11, R ₁₅ may form a 5- or 6-membered ring by linking with R _12.

R ₁₄ represents a hydrogen atom or a lower alkyl group (which may be substituted, for example, a methyl group, an ethyl group,
Propyl group, methoxyethyl group, phenethyl group, etc. More preferably, it represents an alkyl group having 5 or less carbon atoms.

X ₁₁ represents an acid anion residue. v is 0
Alternatively, it represents 1 and is 0 in the case of an inner salt.

More preferred heterocyclic nuclei formed by Z ₁₁ or Z ₁₂ are, when u is 0, Z ₁₁ and Z
₁₂ may be the same or different, thiazole,
Benzothiazole, naphthothiazole, dihydronaphthothiazole, selenazole, benzoselenazole, naphthoselenazole, dihydronaphthoselenazole, oxazole, benzoxazole, naphthoxazole, benzimidazole, naphthimidazole, pyridine, quinoline, imidazo [4,5-b ] A heterocyclic nucleus such as quinoxaline or 3,3-dialkylindolenine,
When u is 1, Z ₁₁ is a heterocyclic nucleus such as thiazoline, thiazole, benzothiazole, selenazoline, selenazole, benzoselenazole, oxazole, benzoxazole, naphthoxazole, imidazole, benzimidazole, naphthimidazole or pyrroline. Z
₁₂ is oxazoline, oxazole, benzoxazole, naphthoxazole, thiazoline, selenazoline,
This is the case of representing a heterocyclic nucleus such as pyrroline, benzimidazole or naphthimidazole.

The nitrogen-containing heterocyclic nucleus represented by Z ₁₁ and Z ₁₂ may have one or more substituents. Examples of preferable substituents include a lower alkyl group (even if branched, further substituents {for example, a hydroxy group, a halogen atom, an aryl group, an aryloxy group, an arylthio group, a carboxy group, an alkoxy group, an alkylthio group, an alkoxycarbonyl group. Group, etc., and more preferably an alkyl group having a total carbon number of 10 or less (eg, methyl group, ethyl group, butyl group, chloroethyl group, 2,2,3,3-tetrafluoropropyl group, Hydroxyethyl group, benzyl group, tolylethyl group, phenoxyethyl group, phenylthioethyl group, carboxypropyl group, methoxyethyl group, ethylthioethyl group, ethoxycarbonylethyl group, etc.), lower alkoxy group (further substituents) The substituent may be substituted with an alkyl group as an example of the substituent. Examples of the group include the same substituents as listed above, more preferably an alkoxy group having a total carbon number of 8 or less, such as methoxy group, ethoxy group, pentyloxy group, ethoxymethoxy group, methylthioethoxy group, phenoxyethoxy. Group, hydroxyethoxy group, chloropropoxy group, etc.), hydroxy group, halogen atom, cyano group, aryl group (eg, phenyl group, tolyl group, anisyl group, chlorophenyl group, carboxyphenyl group, etc.), aryloxy Group (eg, tolyloxy group, anisyloxy group, phenoxy group, chlorophenoxy group), arylthio group (eg, tolylthio group, chlorophenylthio group, phenylthio group), lower alkylthio group (may be further substituted. Examples of substituents) Is a lower alkyl group Such as those mentioned as examples of the substituents. Preferably the total carbon number of 8 or less alkylthio groups than, for example, methylthio group, ethylthio group,
Hydroxyethylthio group, carboxyethylthio group, chloroethylthio group, benzylthio group, etc., acylamino group or sulfonylamino group (more preferably acylamino group having a total carbon number of 8 or less, for example, acetylamino group, benzoylamino group, methanesulfonyl group) Amino group, benzenesulfonylamino group, etc., carboxy group, lower alkoxycarbonyl group (more preferably an alkoxycarbonyl group having a total carbon number of 6 or less, for example, an ethoxycarbonyl group,
Butoxycarbonyl group, etc.), perfluoroalkyl group (more preferably, perfluoroalkyl group having a total carbon number of 5 or less, such as trifluoromethyl group, difluoromethyl group, etc.) and acyl group (more preferably, acyl having a total carbon number of 8 or less). Groups such as acetyl group, propionyl group, benzoyl group, benzenesulfonyl group).

Specific examples of the nitrogen-containing heterocyclic nucleus represented by Z ₁₁ and Z ₁₂ include, for example, thiazoline, 4-methylthiazoline, thiazole, 4-methylthiazole, 4,5-dimethylthiazole, 4-phenylthiazole and benzo. Thiazole, 5-methylbenzothiazole, 6-methylbenzothiazole, 5-ethylbenzothiazole, 5,6
-Dimethylbenzothiazole, 5-methoxybenzothiazole, 6-methoxybenzothiazole, 5-butoxybenzothiazole, 5,6-dimethoxybenzothiazole, 5-methoxy-6-methylbenzothiazole, 5-
Chlorobenzothiazole, 5-chloro-6-methylbenzothiazole, 5-phenylbenzothiazole, 5-acetylaminobenzothiazole, 6-propionylaminobenzothiazole, 5-hydroxybenzothiazole, 5-hydroxy-6-methylbenzothiazole, 5
-Ethoxycarbonylbenzothiazole, 5-carboxybenzothiazole, naphtho [1,2-d] thiazole, naphtho [2,1-d] thiazole, 5-methylnaphtho [1,2-d] thiazole, 8-methoxynaphtho [1] , 2-d] thiazole, 8,9-dihydronaphthothiazole, 3,3-diethylindolenine, 3,3-dipropylindolenine, 3,3-dimethylindolenine, 3,3,5-trimethylindolenine, Selenazoline, selenazole, benzoselenazole, 5-methylbenzoselenazole, 6-methylbenzoselenazole, 5
-Methoxybenzoselenazole, 6-methoxybenzoselenazole, 5-chlorobenzoselenazole, 5,6-
Dimethylbenzoselenazole, 5-hydroxybenzoselenazole, 5-hydroxy-6-methylbenzoselenazole, 5,6-dimethoxybenzoselenazole, 5-
Ethoxycarbonyl benzoselenazole, naphtho [1,
2-d] selenazole, naphtho [2,1-d] selenazole, oxazole, 4-methyloxazole, 4,5
-Dimethyloxazole, 4-phenyloxazole,
Benzoxazole, 5-hydroxybenzoxazole, 5-methoxybenzoxazole, 5-phenylbenzoxazole, 5-phenethylbenzoxazole, 5-phenoxybenzoxazole, 5-chlorobenzoxazole, 5-chloro-6-methylbenzoxazole, 5 -Phenylthiobenzoxazole, 6-
Ethoxy-5-hydroxybenzoxazole, 6-methoxybenzoxazole, naphtho [1,2-d] oxazole, naphtho [2,1-d] oxazole, naphtho [2,3-d] oxazole, 1-ethyl-5. Cyanobenzimidazole, 1-ethyl-5-chlorobenzimidazole, 1-ethyl-5,6-dichlorobenzimidazole, 1-ethyl-6-chloro-5-cyanobenzimidazole, 1-ethyl-6-chloro-5- Trifluoromethylbenzimidazole, 1-propyl-5-butoxycarbonylbenzimidazole, 1-benzyl-
5-methylsulfonylbenzimidazole, 1-allyl-5-chloro-6-acetylbenzimidazole, 1-
Ethylnaphtho [1,2-d] imidazole, 1-Ethyl-6-chloronaphtho [2,3-d] imidazole, 2-
Quinoline, 4-quinoline, 8-fluoro-4-quinoline, 6-methyl-2-quinoline, 6-hydroxy-2-
Examples thereof include quinoline and 6-methoxy-2-quinoline.

Z ₁₁ and Z ₁₂ may be the same or different and each represents an optionally substituted alkyl group or alkenyl group having 10 or less carbon atoms. More preferable substituents on the alkyl group and the alkenyl group include, for example,
Sulfo group, carboxy group, halogen atom, hydroxy group, alkoxy group having 6 or less carbon atoms, optionally substituted aryl group having 8 or less carbon atoms (eg, phenyl group, tolyl group, sulfophenyl group, carboxyphenyl group, etc. ), A heterocyclic group (for example, a furyl group, a thienyl group, etc.),
An optionally substituted aryloxy group having 8 or less carbon atoms (eg, chlorophenoxy group, phenoxy group, sulfophenoxy group, hydroxyphenoxy group), an acyl group having 8 or less carbon atoms (eg, benzenesulfonyl group, methanesulfonyl group) , Acetyl group, propionyl group, etc.), alkoxycarbonyl group having 6 or less carbon atoms (eg, ethoxycarbonyl group, butoxycarbonyl group, etc.), cyano group
Alkylthio group having 6 or less carbon atoms (eg, methylthio group, ethylthio group, etc.), arylthio group having 8 or less carbon atoms and optionally substituted (eg, phenylthio group, tolylthio group, etc.), substituted with 8 or less carbon atoms And a carbamoyl group (eg, carbamoyl group, N-ethylcarbamoyl group, etc.), an acylamino group having 8 or less carbon atoms (eg, acetylamino group, methanesulfonylamino group, etc.) and the like. It may have one or more substituents.

Specific examples of the groups represented by R ₁₁ and R ₁₂ include, for example, methyl group, ethyl group, propyl group, allyl group, pentyl group, hexyl group, methoxyethyl group, ethoxyethyl group, phenethyl group and tolylethyl group. Group, sulfophenethyl group, 2,2,2-trifluoroethyl group,
2,2,3,3-tetrafluoropropyl group, carbamoylethyl group, hydroxyethyl group, 2- (2-hydroxyethoxy) ethyl group, carboxymethyl group, carboxyethyl group, ethoxycarbonylmethyl group, sulfoethyl group, 2- Chloro-3-sulfopropyl group, 3-sulfopropyl group, 2-hydroxy-3-sulfopropyl group, 3-sulfobutyl group, 4-sulfobutyl group, 2-
(2,3-Dihydroxypropyloxy) ethyl group or 2- [2- (3-sulfopropyloxy) ethoxy]
Examples thereof include an ethyl group.

R ₁₃ and R ₁₅ represent a hydrogen atom. Further, R ₁₃ is connected to R ₁₁ and R ₁₅ is connected to R ₁₂ to form a 5-membered or 6-membered
You may form a member ring.

R ₁₄ is a hydrogen atom or a lower alkyl group (which may be substituted, for example, methyl group, ethyl group, propyl group, methoxyethyl group, phenethyl group, etc., more preferably an alkyl group having 5 or less carbon atoms). Represents

X ₁₁ represents an acid anion residue (for example, chlorine ion, bromine ion, iodine ion, perchloric acid ion, rhodanate ion, p-toluenesulfonate ion).

V represents 0 or 1, and is 0 in the case of an inner salt.

Among the sensitizing dyes represented by Chemical formula 52, more preferred sensitizing dyes represented by Chemical formula 52 are u representing 1 and Z ₁₁ is oxazole, benzoxazole, naphthoxazole or the like. Represents a heterocyclic nucleating atom group, Z ₁₂ represents a heterocyclic nucleating atom group such as benzimidazole or naphthimidazole [Z ₁₁ and Z ₁₂
The heterocyclic nucleus represented by each of the above may have one or more substituents as described above, but when Z ₁₂ represents a benzimidazole nucleus or a naphthimidazole nucleus, an electron-withdrawing substituent is preferable. ], At least one of R ₁₁ and R ₁₂ represents a group having a sulfo group, a carboxy group or a hydroxy group, and R ₁₄ represents a hydrogen atom.

Of the sensitizing dyes represented by Chemical formula 52, Z ₁₁ represents an atomic group forming a benzoxazole nucleus, Z ₁₂ represents an atomic group forming a benzimidazole nucleus, and R is particularly preferable. _At least one of ₁₁ and R ₁₂ represents a group containing a sulfo group or a carboxy group, R ₁₄ represents a hydrogen atom, and u represents 1.
The heterocyclic nucleus represented by Z ₁₁ and Z ₁₂ may have one or more substituents as described above, and particularly preferable substituents are a chlorine atom, a fluorine atom in the case of a benzimidazole nucleus, A cyano group, an alkoxycarbonyl group having a total carbon number of 5 or less, an acyl group having a total carbon number of 7 or less, or a perfluoroalkyl group having a carbon number of 4 or less such as a trifluoromethyl group, and a carbon number in the case of another heterocyclic nucleus. An optionally substituted phenyl group having 8 or less, an alkyl group having 5 or less carbon atoms, an alkoxy group having 5 or less carbon atoms, an acylamino group having 5 or less total carbon atoms, a carboxy group, an alkoxycarbonyl group having 5 or less total carbon atoms, A benzyl group, a phenethyl group or a chlorine atom may be mentioned.

Specific examples of the compound represented by Chemical formula 52 are shown below.

[0210]

[Chemical 54]

[0211]

[Chemical 55]

[0212]

[Chemical 56]

[0213]

[Chemical 57]

[0214]

[Chemical 58]

[0215]

[Chemical 59]

[0216]

[Chemical 60]

[0217]

[Chemical formula 61]

[0218]

[Chemical formula 62]

[0219]

[Chemical formula 63]

[0220]

[Chemical 64]

[0221]

[Chemical 65]

[0222]

[Chemical formula 66]

[0223]

[Chemical formula 67]

[0224]

[Chemical 68]

[0225]

[Chemical 69]

[0226]

[Chemical 70]

[0227]

[Chemical 71]

[0228]

[Chemical 72]

[0229]

[Chemical formula 73]

[0230]

[Chemical 74]

[0231]

[Chemical 75]

[0232]

[Chemical 76]

The chemical formula 53 will be described. In chemical formula 53, X
₁ and X ₂ may be the same or different and each is an oxygen atom, a sulfur atom, a selenium atom, a group shown in Chemical formula 77 (in Chemical formula 77, R ₇ represents an alkyl group), and shown in Chemical formula 78. Group (in the formula 78, R _8, R
₉ represents an alkyl group. ) Represents.

Z ₁ and Z ₂ may be the same or different and each represents an atomic group necessary for forming a 5-membered nitrogen-containing heterocycle. R ₁ and R _{2, which} may be the same or different, each represents an alkyl group or an alkenyl group. R ₃ represents an alkyl group, an alkenyl group or an aryl group. R _{4 to} R ₆ may be the same or different and each represents a hydrogen atom, a halogen atom, an alkyl group or an aryl group. Y ₁ is a sulfur atom, an oxygen atom, or
Represents a group represented by (in Chemical Formula 79, R ₁₀ represents an alkyl group). Q ₁ represents an atomic group necessary for forming a 5-membered or 6-membered ring by connecting with a carbon atom of a methylene group.
X ₃ represents an acid anion, and p, q and r are each 1
Or represents 2.

[0235]

[Chemical 77]

[0236]

[Chemical 78]

[0237]

[Chemical 79]

Specific examples of Z ₁ and Z ₂ include thiazole, benzothiazole, naphtho [1,2-d] thiazole, naphtho [2,1-d] thiazole, naphtho [2,2].
3-d] thiazole, selenazole, benzoselenazole, naphtho [2,1-d] selenazole, naphtho [1,
2-d] selenazole, oxazole, benzoxazole, naphtho [1,2-d] oxazole, [2,1-
d] oxazole, naphtho [2,3-d] oxazole, 3,3-dialkylindolenine, imidazole,
Examples thereof include nitrogen-containing heterocycles such as benzimidazole and naphtho [1,2-d] imidazole. These heterocycles include alkyl groups (eg, methyl, ethyl, butyl, trifluoromethyl, etc.), aryl groups (eg, phenyl, tolyl, etc.), hydroxy groups, alkoxy groups (eg, methoxy, ethoxy, butoxy, etc.), Carboxy group, alkoxycarbonyl group (eg, methoxycarbonyl, ethoxycarbonyl, etc.), halogen atom (eg, fluorine, chlorine, bromine, iodine), aralkyl group (eg, benzyl, phenethyl, etc.), cyano group, alkenyl group (eg, It may have one or more substituents such as allyl).

In R ₁ and R ₂ , the alkyl group is a lower alkyl group such as methyl, ethyl, propyl or butyl, a hydroxyalkyl group such as β-hydroxyethyl or γ-hydroxypropyl, β-methoxyethyl or γ-meth. Alkoxyalkyl groups such as toshikipropyl, β-acetoxyethyl, γ-acetoxypropyl, acyloxyalkyl groups such as β-benzoyloxyethyl, carboxymethyl, carboxyalkyl groups such as β-carboxyethyl, methoxycarbonylmethyl, ethoxycarbonylethyl, Alkoxycarbonyl groups such as β-ethoxycarbonylethyl, sulfoalkyl groups such as β-sulfoethyl, γ-sulfopropyl and δ-sulfobutyl, aralkyl groups such as benzyl, phenethyl and sulfobenzyl, and alkenyl groups. Etc. The.

Examples of R ₃ include the alkyl groups and alkenyl groups as described above for R ₁ and R ₂ , and aryl groups such as phenyl, tolyl, methoxyphenyl, chlorophenyl and naphthyl.

In R _{4 to} R ₆ , the alkyl group and the aryl group include the groups described in the above R ₁ and R ₂ , and the halogen atom includes fluorine, chlorine, bromine and iodine. Examples of the alkyl group for R _{7 to} R ₁₀ include lower alkyl groups such as methyl and ethyl. The ring represented by Q ₁ may be substituted with a lower alkyl group such as a methyl group.

As the acid anion of X ₃ , methylsulfate,
It is an alkylsulfate ion such as ethylsulfate, a thiocyanate ion, a toluenesulfonate ion, a halogen ion such as chlorine, bromine and iodine, a perchlorate ion, and the like, which does not exist when the dye has a betaine-like structure. p, q, and r each represent 1 or 2.

Typical examples of the sensitizing dye represented by Chemical formula 53 used in the present invention are shown below.

[0244]

[Chemical 80]

[0245]

[Chemical 81]

[0246]

[Chemical formula 82]

[0247]

[Chemical 83]

[0248]

[Chemical 84]

The sensitizing dye used in the present invention can be synthesized by a method known to those skilled in the art. The time of addition to the silver halide emulsion can be any time until the emulsion is coated. The addition amount can be varied over a wide range, but a good result is 1 × per mol of silver halide.
It is in the range of 10 ⁻⁵ to 1 × 10 ⁻² mol.

The emulsion layer or other hydrophilic colloid layer of the present invention may contain a water-soluble dye as a filter dye or for various purposes such as prevention of irradiation. As the filter dye, a dye for further lowering the photographic sensitivity or a dye having substantial light absorption mainly in the range of 330 nm to 800 nm for improving the safety against safelight light is used.

These dyes may be added to the emulsion layer depending on the purpose, or a mordant may be added to the upper portion of the silver halide emulsion layer, that is, to the non-photosensitive hydrophilic colloid layer farther from the silver halide emulsion layer with respect to the support. It is preferable to add and fix and use.

[0252] different depending molar extinction coefficient of the dye, but is added in an amount of usually ^{10 -2 g / m 2 ~1g /} m 2. Preferably 5
It is ^{0mg / m 2 ~500mg / m 2} . Specific examples of dyes are described in detail in JP-A-63-64039.

In the present invention, various compounds may be incorporated for the purpose of preventing fog during the production process of the lithographic printing material, during storage or processing, or for stabilizing photographic performance. That is, azoles such as benzothiazolium salts, nitroindazoles, chlorobenzimidazoles, bromobenzimidazoles, mercaptothiazoles, mercaptobenzothiazoles, mercaptothiadiazoles, aminotriazoles, benzothiazoles, nitrobenzotriazoles. Etc .; mercaptopyrimidines; mercaptotriazines; thioketo compounds such as oxazolinethione; azaindenes, such as triazaindenes, tetraazaindenes (especially 4-hydroxy-substituted (1,3,3a, 7) tetrazaindenes) ), Pentaazaindenes, etc .; many compounds known as antifoggants or stabilizers such as benzenethiosulfonic acid, benzenesulfinic acid, benzenesulfonic acid amide, etc. It can be added.

The emulsion layer of the lithographic printing material of the present invention contains, for example, polyalkylene oxide or its derivatives such as ethers, esters and amines, thioether compounds, thiomorpholines for the purpose of increasing sensitivity, increasing contrast or promoting development. A developing agent such as a quaternary ammonium salt compound, a urethane derivative, a urea derivative, an imidazole derivative, dihydroxybenzenes or 3-pyrazolidones may be contained. Among them, dihydroxybenzenes (hydroquinone, 2-methylhydroquinone, catechol, etc.) and 3-pyrazolidones (1-phenyl-3-pyrazolidone, 1-phenyl-4-methyl-4-hydroxymethyl-3-pyrazolidone, etc.) are preferable. , Usually used at 5 g / m ² or less. In the case of dihydroxybenzenes, 0.
More preferably 01~2.5g / m ^2, in the case of 3-pyrazolidones, 0.01 to 0.5 g / m ² is more preferable.

The silver salt offset printing material which is the lithographic printing material of the present invention (hereinafter, simply referred to as the printing material of the present invention) is
An anti-halation layer, which is an undercoat layer, is provided on a support, a photosensitive silver halide emulsion layer is further provided thereon, and a physical development nucleus layer is further provided thereon. An intermediate layer can also be provided.

In the printing material of the present invention, it is preferable that a physical development nucleus layer is provided directly on the photosensitive silver halide emulsion layer in the above layer constitution.

In the present invention, the antihalation layer provided closest to the support side is, for example, a hydrophilic colloid layer in which carbon black dye or pigment is dispersed.
Further, in order to impart a printing plate suitability to the antihalation layer and the emulsion layer, fine powder of 1 to 10 μm such as silica can be added.

As a hydrophilic binder which can be advantageously used in the silver halide emulsion according to the present invention, there is gelatin, and a part or all of gelatin is a synthetic polymer such as polyvinyl alcohol or poly-N-vinyl. Pyrrolidone, a polyacrylic acid copolymer, a copolymer of methyl vinyl ether and maleic anhydride, or a compound substituted with a cellulose derivative, a gelatin derivative or the like can be used. Further, various compounds can be added to the above emulsion for the purpose of stabilizing the emulsion during the production process or storage or preventing fogging during development.

Further, in addition to the above compounds, various additives such as hardeners and surfactants can be appropriately used. Specific examples of the compounds can be found in "Product Licensing Index" Vol. 92, No. . 9232, 1
07-110, I-XIII, XVI-XVII, XXIII (19
December 71).

By coating the emulsion thus prepared on the above antihalation layer as a layer by a known method, the photosensitive silver halide emulsion layer according to the present invention can be formed.

Next, the development nuclei of the physical development nuclei layer according to the present invention will be described. For example, water-soluble noble metal salts such as gold, silver, platinum, palladium or zinc, lead, cadmium, nickel, cobalt, iron, chromium, Metal colloids obtained by reducing heavy metals such as tin, antimony, bismuth, etc., or water-soluble metal salts thereof such as nitrates, acetates, borates, chlorides, hydroxides, etc. It is possible to use development nuclei or the like obtained by mixing with a substance such as sodium sulfide.

As the kind of the hydrophilic binder used in the physical development nucleus layer according to the present invention, the same hydrophilic polymer substances as those used in the above-mentioned photosensitive silver halide emulsion layer are applied. Polyvinyl alcohol or a copolymer of methyl vinyl ether and maleic anhydride is preferable, and these may be used in combination. The amount of these hydrophilic binders is not necessarily uniform depending on the type of noble metal or binder, but is in the range of 30% to 100% by weight relative to the physical development nuclei.

The physical development nucleus layer is preferably coated directly on the above-mentioned photosensitive silver halide emulsion layer.

The support of the offset printing material according to the present invention includes, for example, a nitrate film, a cellulose acetate film, a cellulose acetate butyrate film, a polystyrene film, a polyethylene phthalate film, a polycarbonate film or a laminate thereof, paper and the like. . Further, baryta or α-olefin polymer, particularly polyethylene, polypropylene, ethylene butylene copolymer, etc., having 2 to 10 carbon atoms.
Paper coated with or laminated with an α-olefin polymer, a method for enhancing adhesiveness with other polymer substances by roughening the surface as described in JP-B-47-19068, or JP-B-56-56 A support according to the roughening method described in No. 135840 can be used.

Further, in order to reduce the plate elongation, a metal foil,
For example, a support obtained by laminating aluminum foil on paper can be used.

Further, colloidal silica can be used in the coating film applied on the surface of the polyolefin for the purpose of improving the adhesion to the surface coated with the polyolefin, or for improving the printability.

In these regards, US Pat. No. 3,161,151
The method described in the specification No. 9 may be followed.

In order to strengthen the adhesive force between the support and the coating layer,
The surface of the support may be subjected to a pretreatment such as corona discharge, irradiation with ultraviolet rays, and flame treatment. For corona discharge, the method described in US Pat. No. 2012189 is representative.

Hardening treatment of the silver halide emulsion and / or other constituent layers can be carried out by a conventional method. Examples of curing agents are aldehyde compounds such as formaldehyde and glutaraldehyde, diacetyl, ketone compounds such as cyclopentanedione, bis (2-chloroethylurea), 2-hydroxy-4,6-dichloro-1, Three
5-triazine and others US Pat. No. 3,288,775
No. 2,732,303, British Patent No. 974723.
No. 1167207, compounds having a reactive halogen as shown in each specification, divinyl sulfone,
5-acetyl-1,3-diacryloylhexahydro-
1,3,5-triazine and other US Pat. No. 36357
No. 18, No. 3232763, No. 3490911
Nos. 3,642,486, British Patent No. 994869, and the like, compounds having a reactive olefin, N-hydroxymethylphthalimide,
Other US Pat. Nos. 2,732,316 and 2,586,16
No. 8, N-methylol compounds as shown in each specification, isocyanates as shown in US Pat. No. 3,103,437, US Pat. No. 3,017,280.
No. 2,983,611 and the like, aziridine compounds as shown in each specification, US Pat. No. 2,725,294.
No. 2,725,295 and the like, acid derivatives as shown in the respective specifications, US Pat. No. 3,100,704 and the like as carbodiimide compounds, US Pat. No. 3,091,537 and the like. Epoxy compounds as shown, U.S. Pat. No. 3,321,313,
No. 3543292, isoxazole compounds as shown in the respective specifications, halogenocarboxaldehydes such as mucochloric acid, dioxane derivatives such as dihydroxydioxane and dichlorodioxane, or chromium as an inorganic hardener. There are vans and zirconium sulfate. Instead of the above compounds, precursors may be used, for example, alkali metal bisulfite aldehyde adducts, methylol derivatives of hydantoin, primary aliphatic nitroalcohols and the like.

Known surfactants may be added to the constituent layers of the offset printing material of the present invention alone or as a mixture, if necessary. These may be used as coating aids, but in some cases, for other purposes such as emulsion dispersion, acceleration of development, improvement of other photographic characteristics, or adjustment of charge sequence,
It is also applied to prevent static electricity.

These surface active agents include natural products such as saponin, anion or nonionic surface active agents such as alkylene oxide type, glycerin type and glycidol type, higher alkylamines, quaternary ammonium salts,
Heterocycles such as pyridine, cationic surfactants such as phosphonium or sulfonium, anionic surfactants having an acidic group such as carboxylic acid, sulfonic acid, phosphoric acid, sulfuric acid ester, phosphoric acid ester, amino acids, aminosulfonic acids , Amphoteric activators such as sulfuric acid or phosphoric acid esters of amino alcohols.

Some examples of the surfactant compounds that can be used are described in US Pat. Nos. 2,271,623 and 22,
No. 40472, No. 2288226, No. 27398
No. 91, No. 3068101, No. 3158484
No. 3201253, No. 3210191, No. 3294540, No. 3415649, No. 34.
No. 41413, No. 3442654, No. 34757.
No. 74, No. 3545574, British Patent No. 10773.
17 and 11198450, Ryohei Oda et al., "Synthesis of Surfactants and Their Applications" (Maki Shoten, 1964) and A. W. Berry, "Surface Active Agent" (InterScience Publications Incorporated, 1958), J.
P. It is described in "Encyclopedia of Active Agents Vol. 2" (Chemical Publish Company, 1964) by Sisley.

The offset printing material of the present invention may contain a filter dye or an anti-irradiation dye as described above. Examples of such dyes include US Pat. Nos. 2,274,782, 2,527,583 and 29.
No. 56879, No. 3177078, No. 32529
No. 21, and the compounds described in JP-B-39-22069. These dyes may be mordanted by the method described in US Pat. No. 3,282,699, if necessary. Further, as the antihalation layer, a colored layer such as a pigment (for example, lamp black, carbon black, fest black, ultramarine, malachite green, crystal violet) can be used.

As a method of coating the constituent layers of the offset printing material according to the present invention on the above-mentioned support, a coating method well known in the art can be used. For example, there are a dip method, an air knife method, an extrusion doctor method and the like, and particularly preferable is US Pat. No. 27.
It is the bead coating method described in 61791 specification.

A silver halide developing agent may be incorporated in the constituent layers of the offset printing material according to the present invention. In this case, the development after the exposure can be activated by using an alkaline aqueous solution.

The developing agent can be contained in the silver halide emulsion layer, the antihalation layer, or its adjacent layers (undercoat layer, intermediate layer), etc., but it is most preferable to incorporate it in the antihalation layer. The alkaline aqueous solution used for development may also contain a developer.

Specific examples of the developer include polyhydroxybenzenes such as hydroquinone, catechol, chlorohydroquinone, pyrogallol, bromohydroquinone, isopropylhydroquinone, tolhydroquinone, methylhydroquinone, 2,3-dichlorohydroquinone, and 2,5. -Dimethylhydroquinone, 2,3-dibromohydroquinone, 1,4-dihydroxy-2-acetophenone, 4-phenylcatechol, 4-t-butylcatechol, 4-n-butylpyrogallol, 4,5-dipromocatechol, 2, 5-diethylhydroquinone, 2,5-
Benzoylaminohydroquinone, 4-benzyloxycatechol, 4-n-butoxycatechol and the like are included.

Of these, hydroquinone and methylhydroquinone are particularly preferably used.

Other developing agents include 3-pyrazolidone compounds such as 1-phenyl-3-pyrazolidone, 1-p-tolyl-3-pyrazolidone, 1-phenyl-4-methyl-3-pyrazolidone and 1-phenyl-3-pyrazolidone. Phenyl-
4,4-Dimethyl-3-pyrazolidone, 1-p-chlorophenyl-3-pyrazolidone, 1-p-methoxyphenyl-3-pyrazolidone, 1-phenyl-2-acetyl-
3-pyrazolidone, 1-phenyl-5,5-dimethyl-
3-pyrazolidone, 1-o-chlorophenyl-4-methyl-4-ethyl-3-pyrazolidone, 1-m-acetamidophenyl-4,4-diethyl-3-pyrazolidone,
1,5-diphenyl-3-pyrazolidone, 1- (m-tolyl) -5-phenyl-3-pyrazolidone, 4,4-dihydroxymethyl-1-phenyl-3-pyrazolidone,
4,4-dihydroxymethyl-1-tolyl-3-pyrazolidone, 4-hydroxymethyl-4-methyl-1-phenyl-3-pyrazolidone, 4-hydroxymethyl-4-
Methyl-1- (p-chlorophenyl) -3-pyrazolidone and the like are included.

Further, as aminophenols, for example,
p- (methylamino) phenol, p-aminophenol, 2,4-diaminophenol, p- (benzylamino) phenol, 2-methyl-4-aminophenol,
2-hydroxymethyl-4-aminophenol etc. can be mentioned.

The above developing agents can be used alone or in combination. Particularly, a combination of a polyhydroxybenzene compound and a 3-pyrazolidone compound is preferable. Although the amount of the developing agent used in the constituent layers is not uniform,
It may be in the range of 0.001 g to 1 g per 1 m ^{2, and in} the case of a silver halide emulsion layer 0.01 g to 3 g / g of silver halide.
Used in the range of.

Further, if necessary, a compound capable of easily forming a soluble silver complex salt with the unexposed portion of silver halide, which is called a complexing agent, may be contained in the constituent layers to advantageously promote physical development.

As the complexing agent, for example, thiosulfates, thiocyanates, amine thiosulfates as described in US Pat. No. 3,169,996, or cyclic imides described in US Pat. No. 2,857,276,
A mercapto compound described in JP-B-46-11957 may be contained.

The above developing agents may be added to the coating solution after being dissolved in water or a hydrophilic solvent such as methanol, or may be dissolved in a high boiling point organic solvent or a low boiling point organic solvent and added. . The high boiling point organic solvent generally has a boiling point of about 180 ° C. or higher, and examples thereof include allyl esters of phthalic acid such as ethyl phthalate and n-butyl phthalate, and phosphoric acid esters such as tricresyl phosphate. The low-boiling organic solvent generally has a boiling point of about 30 ° C. to 150 ° C., and examples thereof include lower alkyl acetates such as ethyl acetate and butyl acetate.

These high and low boiling point solvents may be used in combination, and the dissolved developing agent may be dispersed in the hydrophilic colloid by any known method.

When it is added to the constituent layers of the offset printing material according to the present invention, it is added directly to any layer or dissolved in gelatin or a synthetic polymer compound such as polyvinyl alcohol or poly. Examples thereof include vinylpyrrolidone, alkyl acrylates, sulfoalkyl acrylates described in US Pat. No. 3,488,708, and copolymers of acrylic acid.

When the offset printing material of the present invention is subjected to alkali activation treatment after exposure, a treatment liquid containing various additives can be used.

The main examples thereof are alkaline agents (eg, alkali metal or ammonium hydroxides, carbonates, phosphates), pH adjusters or buffers (eg, weak acids or weak bases such as acetic acid, sulfuric acid, or the like). Salt), a development accelerator (for example, various pyridinium compounds and cationic compounds described in US Pat. Nos. 2,648,604 and 3,671,247), potassium nitrate and sodium nitrate,
U.S. Pat. Nos. 2,533,990 and 2,577,127,
Nonionics such as polyethylene glycol condensates and derivatives thereof described in JP-B-2950970 and polythioethers represented by compounds described in British Patent Nos. 1020033 and 1020032. Compounds, polymer compounds having sulfite ester as represented by the compounds described in US Pat. No. 30,680,97, other organic amines such as pyridine, ethanolamine, cyclic amine, benzyl alcohol, hydrazines, etc.), Antifoggants (for example, alkali chloride, alkali bromide, alkali iodide and nitrobenzimidazoles described in U.S. Pat. Nos. 2,496,940 and 2,656,271, mercaptobenzimidazole, 5-methylbenzotriazole,
1-phenyl-5-mercaptotetrazole, U.S. Pat. Nos. 3,113,864, 3,342,596 and 32.
No. 95976, No. 3615522, No. 35971
Compounds for rapid processing solutions described in Japanese Patent No. 99, etc., thiosulfonyl compounds described in British Patent No. 972211, or phenazine-N-oxide as described in Japanese Patent Publication No. 46-41675. And other fog inhibitors described in "Science Photographic Handbook", Vol. 29, page 47 to page 47), and others, U.S. Pat. No. 31,615.
No. 13, No. 3161514, British Patent No. 10304
No. 42, No. 1144441, No. 1251558, and stain or anti-sludge agents, and preservatives (for example, sulfite, acidic sulfite, hydroxylamine hydrochloride, form sulfite, alkanolamine sulfite adduct). and so on. Further, a sequestering agent such as sodium hexametaphosphate and ethylenediaminetetraacetic acid, a wetting agent such as saponin and ethylene glycol, and the like can be used.

Further, in the developing solution, as a silver halide solvent, sodium thiosulfate, sodium thiocyanate,
It may contain potassium thiocyanate, alkanolamines, cyclic imines, alkyl-substituted amino alcohols, thioureas, mesoions, thiosalicylic acid, thiosalicylic acid capable of forming thiosalicylic acid in an alkaline solution, such as 5-methylcarbamoylthiosalicylic acid.

When it is necessary to stop development of the offset printing material according to the present invention after development, a neutralizing solution can be used. This neutralization solution can be used in a normal acidic stop bath,
May be adjusted to about 3.0 to 8.0. The neutralizing solution may contain a water softening agent, a pH adjusting agent, a buffering agent, a hardening agent, etc. For the purpose of eliminating ink stains on the printing plate to be treated, colloidal silica, polyols, etc. May be added and contained.

After the printing material is treated as described above to obtain a plate-making product, various post-treatments can be carried out for the purpose of improving and improving printability. For example, for the purpose of improving ink receptivity, US Pat. Nos. 3,592,647 and 3,490,906.
No. 3161508, Japanese Patent Publication No. 46-109
No. 10, No. 48-29723, No. 51-15762.
No. 52-15762.

[0292]

EXAMPLES The present invention will be specifically described below with reference to examples.

Example 1 Emulsions A to S were prepared by the following method.

Emulsion A (Comparative Example) An aqueous solution of potassium bromide and an aqueous solution of silver nitrate were stirred in the presence of 1,8-dihydroxy-3,6-dithiaoctane solvent for 5 minutes at 75 ° C. while vigorously stirring the aqueous gelatin solution. And simultaneously added to obtain an octahedral silver bromide emulsion having an average grain size of 0.15 μm. Sodium thiosulfate and chloroauric acid (tetrahydrate) were added to this emulsion, and the emulsion was subjected to chemical sensitization treatment by heating at 75 ° C. for 50 minutes. Using the silver bromide particles thus obtained as a core, a potassium bromide solution and an aqueous solution of silver nitrate were simultaneously added for 40 minutes for further growth, and finally a cubic monodisperse core / shell bromide having an average particle size of 0.32 μm was added. After obtaining a silver emulsion and washing with water and desalting, an internal latent image type emulsion A was obtained.

Preparation of Emulsion B An aqueous solution of potassium bromide and an aqueous solution of silver nitrate were simultaneously added to an aqueous gelatin solution at 75 ° C. for 10 minutes to obtain a cubic silver bromide emulsion having an average particle size of 0.2 μm. It was Sodium thiosulfate and chloroauric acid (tetrahydrate) were added to this emulsion, and the mixture was heated at 75 ° C. for 50 minutes for chemical sensitization. Using the silver bromide particles thus obtained as a core, a mixed aqueous solution of sodium chloride and potassium bromide containing iridium (IV) ammonium chloride and an aqueous silver nitrate solution were added simultaneously for 70 minutes while controlling the potential. After further growth, a cubic monodisperse core / shell silver chlorobromide emulsion (AgCl ₆₀ Br ₄₀ ) having an average particle size of 0.32 μm was finally obtained, and an internal latent image type emulsion B was obtained after washing with water and desalting.

Preparation of Emulsion C When shelling Emulsion B, an octahedral monodisperse core / shell silver chlorobromide emulsion (AgCl ₆₀₎ having an average grain size of 0.32 μm was used without changing the control potential and temperature. Br ₄₀ )
Was prepared. This is designated as internal latent image type emulsion C.

Preparation of Emulsion D An aqueous solution of sodium chloride and an aqueous solution of silver nitrate were simultaneously added to an aqueous solution of gelatin at 40 ° C. for 10 minutes,
A cubic silver chloride emulsion having an average grain size of 0.15 μm was obtained. Add sodium thiosulfate and chloroauric acid (tetrahydrate) to this emulsion.
Was added and the mixture was heated at 65 ° C. for 50 minutes for chemical sensitization. With the silver chloride particles thus obtained as the core,
To add shells, sodium chloride containing iridium (IV) chloride and an aqueous silver nitrate solution were added simultaneously at 50 ° C. for 30 minutes for further growth, and finally a cubic monodisperse core / shell emulsion having an average particle size of 0.32 μm. (AgCl) was obtained, washed with water and desalted to obtain an internal latent image type emulsion D.

Preparation of Emulsion E After the chemical sensitization of the core particles of Emulsion D was completed, the average grain size was the same as in Emulsion D except that the bipyridinium compound (9) was added in an amount of 1.7 × 10 ⁻³ mol per mol of Ag. Diameter 0.32 μm
Thus, an octahedral monodisperse core / shell type silver chloride emulsion E was obtained. Preparation of Emulsion F A mixed aqueous solution of sodium bromide and potassium bromide and an aqueous solution of silver nitrate were simultaneously added to an aqueous gelatin solution at 45 ° C. for 15 minutes to give a cubic salty odor having an average particle size of 0.15 μm. A silver halide emulsion was obtained. Sodium thiosulfate and chloroauric acid (tetrahydrate) were added to this emulsion, and the mixture was heated at 68 ° C. for 50 minutes for chemical sensitization. Using the thus obtained silver chlorobromide grains as a core, for further shelling, an aqueous sodium chloride solution containing ammonium iridium (IV) chloride and an aqueous silver nitrate solution were simultaneously added at 50 ° C. for 30 minutes to further grow, and finally. Average particle size 0.32
μm cubic core / shell type silver chlorobromide emulsion (AgCl
₉₅ Br ₅ ) was obtained, washed with water and desalted to obtain an internal latent image type emulsion F.

Preparation of Emulsion G After the chemical sensitization of the core grains of Emulsion F was completed, the same procedure as in Emulsion F was performed except that the bipyridinium compound (9) was added in an amount of 1.8 × 10 ⁻³ mol per mol of Ag. An octahedral monodisperse core / shell type silver chlorobromide emulsion G having a size of 0.32 μm was obtained.

Preparation of Emulsion H A cubic silver chlorobromide core of AgCl ₈₅ Br ₁₅ was changed by changing only the halogen composition of the halogen solution when the emulsion F was shelled.
A shell emulsion H was obtained.

Preparation of Emulsion I The octahedral silver chlorobromide core / shell emulsion I of AgCl ₈₅ Br ₁₅ was prepared by changing only the halogen composition of the halogen solution of the emulsion G with shells.

Preparation of Emulsions J, K, L and M In preparing Emulsions F and G, as shown in Table 1, by adjusting the temperature and addition time during grain formation, the grain sizes corresponding to these were Each different emulsion J
(Cubic; average particle size 0.50 μm), emulsion K (cubic; average particle size 0.25 μm), emulsion L (octahedral; average particle size 0.50 μm), emulsion M (octahedral; average particle size 0.
25 μm) of four types of emulsions were obtained.

Preparation of Emulsions N and O Emulsions F and G were added in the same manner except that the KI solution was added after the shelling additions, and the corresponding emulsions N
(Cubic of AgCl _94.5 Br ₅ I _0.5 ), emulsion O (Ag
Cl _94.5 Br ₅ I _0.5 octahedra) were prepared.

Preparation of Emulsions PS When preparing Emulsion G, the bipyridinium compound (6), (7), (8), instead of the bipyridinium compound (9),
As in Table 1, except that (22) was added in the same manner, octahedral or tetradecahedral silver chlorobromide emulsions P to S were obtained.

Preparation of Emulsion T After the chemical sensitization of the core grains of Emulsion B was completed, the bipyridinium compound (9) was used in the same manner as in the preparation of Emulsion E,
An octahedral monodisperse core / shell type silver chlorobromide emulsion T (average particle size 0.32 μm) was obtained.

Preparation of lithographic printing plate A matting layer containing silica particles having an average particle size of 5 μm was provided on one side of a polyester film support which had been subjected to subbing treatment, and carbon black was included on the opposite side of the photographic gelatin. A halation-preventing subbing layer containing 20% by weight of silica powder having an average particle size of 7 μm;
15 nucleating agents (2.5 × 10 ⁻⁶ mol / Ag mol), II
Emulsion A containing -1 nucleation accelerator (8.8 × 10 ⁻⁴ mol / Ag mol) and sensitizing dye III-37 (1.5 × 10 ⁻³ mol / Ag mol) was coated.

The gelatin in the undercoat layer was 3.1 g / m ² , the gelatin in the emulsion layer was 1.3 g / m ² , and the coated silver amount was 1.3 g / m ² . Formalin was used as a hardening agent in the undercoat layer and the emulsion layer.

On this emulsion layer, Pd which is a physical development nucleus is formed.
Apply and dry polyvinyl alcohol solution containing S nucleus,
A planographic printing plate No. 1 was produced. Further, in the planographic printing plate No. 1, the above emulsions B to T were used instead of the emulsion A, respectively.
The planographic printing plate was prepared by adding the nucleating agent and the nucleating accelerator as shown in Table 1.
No. 2 to No. 20 were produced.

Each of these lithographic printing plates was passed through an interference filter of 633 nm to a high illuminance photometer for 10 ^-6 seconds to ^reach 100.
~ 5 lines of 200 lines / inch gray contact screen
A halftone dot image having an area of 100% to 95% was exposed and processed with a developer (X) at 30 ° C. for 30 seconds to obtain a negative transfer image.

Immediately after the development treatment, a neutralizing solution having the following composition was treated at 25 ° C. for 15 seconds to remove excess solution with a squeezing roller, followed by drying at room temperature.

<Developer (X)> Water 700 ml Potassium hydroxide 23 g Anhydrous sodium sulfite 50 g Hydroquinone 42 g 2-Mercaptobenzoic acid 1.5 g 2-Methylaminoethanol 15 g 2-Methylimidazole 2.0 g Uracil 2.0 g Water 1 Bring to liter (adjust to pH 11.0).

<Neutralization liquid> Water 600 ml Citric acid 11 g Sodium citrate 36 g Colloidal silica (20% liquid) 6 ml Ethylene glycol 6 ml Water is made up to 1 liter.

The resolution of each lithographic printing plate No. 1 to No. 20 was evaluated. The resolution of the lithographic printing plate is 100, 133, 15 for the gray contact screen.
0, 175 and 200 lines / inch were used, and minute halftone dots (5% dots) were reproduced clearly and clearly. Evaluation 1 (100 lines / inch) to evaluation 5 (20
It was expressed in 5 stages of 0 line / inch).

Further, the lithographic printing plate made with a contact screen was mounted on an offset printing machine, the following desensitizing liquid was applied all over the plate surface, and printing was performed using a dampening liquid.

<Desensitizing liquid> Water 550 ml Isopropyl alcohol 450 ml Ethylene glycol 50 g Compound A (formula 85) 1 g

<Moisturizing liquid> o-phosphoric acid 10 g nickel nitrate 5 g sodium sulfite 5 g ethylene glycol 100 g colloidal silica (20% liquid) 28 g Water is added to make 2 liters.

[0317]

[Chemical 85]

As the printing machine, AB Dick 350CD manufactured by AB Dick was used. The printing durability according to the number of sheets in which printing became impossible due to the occurrence of background stains or the scattering of silver was evaluated according to the following criteria. The above results are summarized in Table 1.

Printing durability evaluation criteria 1 4000 sheets or less 2 4001 to 6000 sheets 3 6001 to 8000 sheets 4 8001 to 10000 sheets 5 10001 sheets or more

[0320]

[Table 1]

As shown in Table 1, it can be seen that the emulsion having Br of 50 mol% or less exhibits good performance. Note that EP48
A lithographic printing material using a conversion type internal latent image type emulsion was prepared according to the description of 1562A1 and subjected to the same treatment as that described above, but the properties were obviously inferior to those of the present invention. .

Example 2 The planographic printing plate Nos. 1 to 20 were treated with a developing solution (Y) at 30%.
After developing for 30 seconds at 30 ° C, use developer (Z) for 2 seconds at 30 ° C.
A lithographic printing plate comprising a negative transfer image was obtained in the same manner as in Example 1 except that the treatment was performed for 0 seconds, and the resolution and printing durability were evaluated. The results are shown in Table 2.

Developer (Y) (Z) Water 700 ml 700 ml Potassium hydroxide 23 g 23 g Anhydrous sodium sulfite 50 g 50 g Hydroquinone 42 g 42 g 2-Mercaptobenzoic acid 1.5 g 1.5 g 2-Methylaminoethanol-15 g 2-Methylimidazole 2 0.0 g 2.0 g Uracil-10 g Make up to 1 liter with water. (Adjust to pH 11.0) (Adjust to pH 11.0)

[0324]

[Table 2]

As shown in Table 2, it can be seen that an emulsion having a Br content of 50 mol% or less exhibits good performance, as in Example 1, even if the processing system is changed. Note that EP481562A
When a lithographic printing material using a conversion type internal latent image type emulsion was prepared in accordance with the description of 1, and treated in the same manner as above, the characteristics were obviously inferior to those of the present invention. .

[0326]

According to the present invention, a negative transfer image can be obtained by utilizing the silver salt diffusion transfer method. This product has high sensitivity, high resolution, and good printability. Further, it becomes possible to deal with a high illuminance light source, and it becomes possible to deal with various processing systems.

Claims (4)

[Claims] 1. A lithographic printing material utilizing a silver salt diffusion transfer method having at least a silver halide emulsion layer and a physical development nucleus layer on a support, wherein the silver halide emulsion is a core / shell internal latent image. An image-type emulsion, wherein the composition of silver halide is substantially Br.
A lithographic printing material which is a silver chlorobromide or silver chloride having a content of 50 mol% or less and obtains a negative transfer silver image. 2. The lithographic printing material according to claim 1, wherein the silver halide emulsion has a core surface chemically sensitized and has a crystal habit of a cube or an octahedron. 3. The lithographic printing material according to claim 2, wherein the crystal habit is an octahedron. 4. Particle formation is carried out in the presence of at least one compound selected from the compounds represented by the following chemical formulas 1 and 2,
The lithographic printing material according to claim 3, wherein a silver chlorobromide emulsion or a silver chloride emulsion having an octahedral crystal habit and having a Br content of 45 mol% or less is prepared. [Chemical 1] [Chemical 2] [In Chemical Formula ₁ , A ₁ and A ₂ each represent a nonmetallic atom group necessary for completing the nitrogen-containing heterocycle, and each may be the same or different. B represents a divalent linking group. x represents 0 or 1. R ₅₁ and R ₅₂ each represent an alkyl group. X ₅ represents a monovalent anion. y
Represents the number required to balance the charge, and y is 0 when forming an intramolecular salt. In the chemical formula 2, A ₃ and A ₄ each represent a nonmetallic atom group necessary for completing the nitrogen-containing heterocycle, and each may be the same or different. B represents a divalent linking group. X ₅ represents a monovalent anion. y represents the number required to balance the charge, and y is 0 when forming an intramolecular salt. ]