JP2000275779A - Heat-developable photosensitive material and its processing method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a heat-developable photosensitive material improved in heat contraction at the time of development and conveyability during heat development. SOLUTION: The heat-developable photosensitive material contains organic silver grains and photosensitive silver halide grains and a reducing agent and a hydrazine derivative and/or quarternary onium salt on a support, and the ratio of the dried total film thickness p of the photographic constituent layers applied to the support to a support thickness s satisfies the following expression: 0.06<=p/s<=0.38.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a photothermographic material, and more particularly to a photothermographic material suitable for printing plate making.

[0002]

2. Description of the Related Art Conventionally, in the field of printing plate making and medical treatment, a waste liquid accompanying wet processing of an image forming material has become a problem in terms of workability. Weight loss is strongly desired. Therefore, there is a need for a technique relating to photothermographic materials for photographic applications, which enables efficient exposure with a laser imagesetter or laser imager and can form a high-resolution and clear black image. This technique includes, for example, U.S. Patent Nos. 3,152,904 and 3,487,075 and D.C. "Dry Silver Photograph" by Morgan
phy Materials) "(Handbook
of Imaging Materials, Ma
rcelDekker, Inc. 48, 1991)
And the like, a photothermographic material containing an organic silver salt, photosensitive silver halide grains, a reducing agent and a binder on a support is known.

[0003] These photothermographic materials form a photographic image by a heat development process, and include a reducible silver source (organic silver salt), a photosensitive silver halide, a reducing agent and, if necessary, a silver salt. A color toning agent for suppressing color tone is usually contained in a dispersed state in an (organic) binder matrix. The photothermographic material is stable at room temperature, but is exposed to high temperature (for example, 8
(0 to 150 ° C.). Heating generates silver through an oxidation-reduction reaction between an organic silver salt (functioning as an oxidizing agent) and a reducing agent. This oxidation-reduction reaction is accelerated by the catalytic action of the latent image generated on the silver halide upon exposure. The silver formed by the reaction of the organic silver salt in the exposed areas provides a black image, which contrasts with the unexposed areas, resulting in the formation of an image. This reaction process
The process proceeds without supplying a processing liquid such as water from the outside.

In the case of photothermographic materials, 80 to 15 is used.
In many cases, thermal development is performed at 0 ° C., and the dimensional change of the photosensitive material after thermal development is large and has become a practical problem compared to conventional photosensitive materials of wet development. JP-A-61-235608
Or JP-A-3-275332 describes a method of relaxing after heat setting during the film forming process. However, such a method results in a large heat shrinkage after the undercoating, and as a result, the image quality of the photosensitive material is reduced. Is reduced. In Japanese Patent Application Laid-Open Nos. 10-10676 and 10-10677, the support is heat-treated after forming the film, and there is a problem that a large equipment investment is required for practical use.

[0005]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a photothermographic material having improved heat shrinkage during development and improved transportability in a heat developing machine, and a processing method therefor.

[0006]

The object of the present invention has been attained by the following constitutions.

1) A photothermographic material containing organic silver particles, photosensitive silver halide particles, a reducing agent, a hydrazine derivative and / or a quaternary onium salt compound on a support,
The ratio p / s of the dry total film thickness p of the photographic constituent layer applied to the support to the support thickness s is 0.06 ≦ p / s ≦ 0.3.
8. A photothermographic material according to item 8,

2) The developing conditions in the heat developing section of the heat developing machine are 100 ° C. or more and 150 ° C. or less, and the path length (ps) of the heat developing section and all the transport rollers and / or
Or the contact length (r
s) is in the range of 0.04 ≦ rs / ps ≦
The photothermographic material according to 1), wherein the photothermographic material is 1.4.

3) A photothermographic material containing organic silver particles, photosensitive silver halide particles, a reducing agent, a hydrazine derivative and / or a quaternary onium salt compound on a support is subjected to heat development. The development processing conditions in the heat development section of the machine are 100 ° C. or more and 150 ° C. or less, and the path length (ps) of the heat development section is in contact with all the transport rollers and / or all heat rollers of the thermal development section in the transport direction. Length (r
s) is in the range of 0.04 ≦ rs / ps ≦
A method for processing a photothermographic material, wherein the material is 1.4.

4) The thickness of the support is 110 μm or more and 15
The photothermographic material according to the above item 2), wherein the thickness is 0 μm or less.

5) The thickness of the support is 110 μm or more and 15
The method for processing a photothermographic material according to the above item 3), wherein the thickness is 0 μm or less.

Hereinafter, the present invention will be described in detail.

In the photothermographic material, since the thermal development is performed at a temperature higher than the Tg of the PET support, the PET support undergoes thermal contraction. On the other hand, in the photothermographic material, the heat capacity of the photographic material becomes larger as the photographic constituent layer excluding the support becomes thicker. Therefore, the heat is dispersed without being concentrated on the support PET, so that the dimensional shrinkage is improved. The thicker the support is, the more heat capacity increases, and it is preferable that the support reaches Tg at the time of development, which is preferable. However, if the support is too thick, the so-called stiffness of the photosensitive material becomes too strong, which often causes transport trouble. Therefore, the thickness of the support is preferably from 110 μm to 150 μm, more preferably from 110 μm to 130 μm.

If the thickness of the photographic component layer is too large, heat cannot be transmitted during development, resulting in poor development. This is the same tendency not only on the photosensitive layer side but also when the backing layer is too thick.
From the balance between heat shrinkage and developability, the ratio p / s of the dry total film thickness p of the photographic constituent layer excluding the support to the support thickness s in the photothermographic material is 0.06 ≦ p / s ≦ 0.38. The present inventor has found that 0.15 ≦ p / s ≦ 0.30 is more preferable.

The development temperature is 100 ° C. or more, 150
C. or lower, preferably 100.degree. C. or higher and 130.degree. C. is more preferable. If the temperature is lower than 100 ° C., sufficient development is not performed.
If the temperature is higher, the unexposed portion is also blackened, and it is very difficult to control the development temperature / time.

The path length (ps) of the heat developing section of the present invention is defined by measuring the length of the photosensitive material at a location corresponding to the developing section when the photosensitive material is spread over the entire developing section. The contact length (rs) in the transport direction with all the transport rollers and / or all the heat rollers of the thermal developing unit is:
The total length in the transport direction on both the photosensitive layer side and the backing side that are in contact with the roller of the developing unit. The measuring method is from both sides (before and after the transport direction) of the area where the roller and the photosensitive material are in contact. 25 μm PET base (TORAY
Lumirror # 25) and the inserted 25 μm PE
The length of the tip from the tip of T is defined as the contact length, and the sum of these is defined as rs.

The present inventor has determined that rs / ps is 0.04 ≦ rs /
ps ≦ 1.4 is preferable, and 0.10 ≦ rs / ps ≦ 1.
It has been found that 0 is more preferable. If the contact length is too short, too little heat is transferred from the rollers during the desired development time, resulting in insufficient development. On the other hand, if the contact length is too long, it will come into contact with many rollers due to high heat, causing curling, and in general, a non-uniform force applied to the photosensitive material (pulling during transport, etc.), causing distortion.

Hereinafter, the present invention will be described in more detail.

In the present invention, when the photothermographic material contains a hydrazine derivative as a high contrast agent, the effect is regrettedly exhibited.

As the hydrazine derivative, a compound represented by the following general formula [H] is preferable.

[0021]

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In the formula, A ₀ represents an aliphatic group, an aromatic group, a heterocyclic group or a -G ₀ -D ₀ group which may have a substituent;
B ₀ represents a blocking group, and A ₁ and A ₂ each represent a hydrogen atom, or one represents a hydrogen atom and the other represents an acyl group, a sulfonyl group, or an oxalyl group. Here, G ₀ is -CO-
Group, -COCO- group, -CS- group, -C (= NG ₁ D ₁ )
— Group, —SO— group, —SO ₂ — group or —P (O) (G ₁ D
₁ ) represents a group, G ₁ represents a mere bond, an —O— group, —S—
Group or -N (D ₁₎ - represents a group, D ₁ is an aliphatic group, an aromatic group, a heterocyclic group or a hydrogen atom, a plurality of D ₁ in the molecule
If they are present, they can be the same or different. D ₀ is a hydrogen atom, an aliphatic group, an aromatic group, a heterocyclic group,
Represents an amino group, an alkoxy group, an aryloxy group, an alkylthio group, or an arylthio group.

In the general formula [H], the aliphatic group represented by A ₀ preferably has 1 to 30 carbon atoms, and particularly preferably a linear, branched or cyclic alkyl group having 1 to 20 carbon atoms. For example, a methyl group, an ethyl group, a t-butyl group,
Octyl group, cyclohexyl group, benzyl group, and the like, and further suitable substituents (for example, aryl group,
Alkoxy, aryloxy, alkylthio, arylthio, sulfoxy, sulfonamido, sulfamoyl, acylamino, ureido, etc.).

In the general formula [H], the aromatic group represented by A ₀ is preferably a monocyclic or condensed ring aryl group, for example, a benzene ring or a naphthalene ring, and a heterocyclic group represented by A _0. As the ring group, a heterocyclic ring containing at least one heteroatom selected from nitrogen, sulfur, and oxygen atoms in a single ring or a condensed ring is preferable.For example, a pyrrolidine ring, an imidazole ring, a tetrahydrofuran ring, a morpholine ring, a pyridine ring, a pyrimidine ring Ring, quinoline ring, thiazole ring,
Benzothiazole ring, a thiophene ring, a furan ring, and, in -G ₀ -D ₀ group represented by A _0, G ₀ is -CO
Group, -COCO- group, -CS- group, -C (= NG
₁ D ₁₎ - group, -SO- group, -SO ₂ - group or -P (O)
(G ₁ D ₁ ) — represents a group. G ₁ is a mere bond, -O-
A group, —S— group or —N (D ₁ ) — group, wherein D ₁ represents an aliphatic group, an aromatic group, a heterocyclic group or a hydrogen atom, and when a plurality of D ₁ are present in the molecule, They can be the same or different. D ₀ is a hydrogen atom, an aliphatic group, an aromatic group,
It represents a heterocyclic group, an amino group, an alkoxy group, an aryloxy group, an alkylthio group, or an arylthio group, and preferable D ₀ includes a hydrogen atom, an alkyl group, an alkoxy group, an amino group, and the like. Aromatic groups A _0, heterocyclic group or -G ₀ -D ₀ group may have a substituent. Particularly preferred as A ₀ is an aryl group or -G ₀ -D ₀ group.

In the general formula [H], A ₀ preferably contains at least one of a diffusion-resistant group or a silver halide-adsorbing group. As the diffusion-resistant group, a ballast group commonly used in immobile photographic additives such as couplers is preferable, and as the ballast group, a photographically inactive alkyl group, alkenyl group, alkynyl group, alkoxy group, phenyl Group,
Examples thereof include a phenoxy group and an alkylphenoxy group, and the total number of carbon atoms in the substituent is preferably 8 or more.

In the general formula [H], examples of the silver halide adsorption promoting group include thiourea, thiourethane group, mercapto group, thioether group, thione group, heterocyclic group, thioamide heterocyclic group, mercapto heterocyclic group, or JP-A-64-
90439 and the like.

In the general formula [H], B ₀ represents a blocking group, preferably -G ₀ -D ₀ group, and G ₀ represents-
CO- group, -COCO- group, -CS- group, -C (= NG
₁ D ₁₎ - group, -SO- group, -SO ₂ - group or -P
(O) represents a (G ₁ D ₁ ) — group. Preferred G ₀ is-
A CO— group or a —COCO— group, wherein G ₁ represents a mere bond, a —O— group, a —S— group or a —N (D ₁ ) — group, and D ₁ represents an aliphatic group or an aromatic group , A heterocyclic group or a hydrogen atom, and when a plurality of D ₁ are present in the molecule, they may be the same or different. D ₀ is a hydrogen atom, an aliphatic group, an aromatic group, a heterocyclic group, an amino group, an alkoxy group,
It represents an aryloxy group, an alkylthio group, or an arylthio group, and preferred D ₀ includes a hydrogen atom, an alkyl group, an alkoxy group, an amino group, and the like. A ₁ and A ₂ are both hydrogen atoms, or one is a hydrogen atom and the other is an acyl group (acetyl group, trifluoroacetyl group, benzoyl group, etc.), a sulfonyl group (methanesulfonyl group, toluenesulfonyl group, etc.), or an oxalyl group (Such as an ethoxalyl group).

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

[0029]

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[0030]

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[0031]

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[0032]

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[0033]

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[0034]

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Other hydrazine derivatives which can be preferably used include compounds H-1 to H-29 described in columns 11 to 20 of US Pat. No. 5,545,505 and column 9 of US Pat. No. 5,464,738. Compounds 1 to 12 described in Nos. 1 to 11. These hydrazine derivatives can be synthesized by a known method.

The hydrazine derivative-added layer is a photosensitive layer containing a silver halide emulsion and / or a layer adjacent to the photosensitive layer. The optimum amount is not uniform depending on the grain size of the silver halide grains, the halogen composition, the degree of chemical sensitization, the type of the inhibitor, and the like, but is preferably 10 ^-6 to 10 per mol of silver halide.
^The preferred range is about ^-1 mol, particularly 10 ^-5 to 10 ^-2 mol.

The photothermographic material of the present invention includes hydroxylamine compounds, alkanolamine compounds and ammonium phthalate compounds described in US Pat. No. 5,545,505, and US Pat. No. 5,545,507. Hydroxamic acid compounds of US Pat. No. 5,558,983
N-acyl-hydrazine compounds described in U.S. Pat. No. 5,545,515, acrylonitrile compounds described in U.S. Pat. No. 5,937,449, and benzhydrol, diphenylphosphine, dialkylpiperidine and alkyl described in U.S. Pat. No. 5,937,449. It is preferable to add a hardening accelerator such as a hydrogen atom donor compound such as -β-ketoester. Among them, a quaternary onium compound represented by the following general formula (P) is preferably used.

[0038]

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In the formula, Q represents a nitrogen atom or a phosphorus atom;
₁ , R ₂ , R ₃ and R ₄ each represent a hydrogen atom or a substituent, and X ⁻ represents an anion. Incidentally, R _{1 to} R ₄ may be connected to each other to form a ring.

In the general formula (P), the substituent represented by R _{1 to} R ₄ is an alkyl group (methyl group, ethyl group,
Propyl group, butyl group, hexyl group, cyclohexyl group, etc., alkenyl group (allyl group, butenyl group, etc.), alkynyl group (propargyl group, butynyl group, etc.), aryl group (phenyl group, naphthyl group, etc.), heterocyclic group (Piperidinyl group, piperazinyl group, morpholinyl group, pyridyl group, furyl group, thienyl group, tetrahydrofuryl group, tetrahydrothienyl group, sulfolanyl group, etc.), amino group and the like.

The ring which may be formed by connecting R _{1 to} R ₄ to each other includes a piperidine ring, a morpholine ring, a piperazine ring,
Examples include a quinuclidine ring, a pyridine ring, a pyrrole ring, an imidazole ring, a triazole ring, and a tetrazole ring.

The groups represented by R _{1 to} R ₄ are hydroxyl groups,
It may have a substituent such as an alkoxy group, an aryloxy group, a carboxyl group, a sulfo group, an alkyl group and an aryl group.

As R ₁ , R ₂ , R ₃ and R ₄ , a hydrogen atom and an alkyl group are preferred.

Examples of the anion represented by X ⁻ include inorganic and organic anions such as a halogen ion, a sulfate ion, a nitrate ion, an acetate ion and a p-toluenesulfonic acid ion.

More preferably, the following general formulas (Pa) and (P
b) or a compound represented by (Pc); and a compound represented by the following general formula [T].

[0046]

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In the formula, A ¹ , A ² , A ³ , A ⁴ and A ⁵ represent a group of nonmetal atoms for completing a nitrogen-containing heterocyclic ring, and may contain an oxygen atom, a nitrogen atom and a sulfur atom. And the benzene ring may be condensed. A ¹ , A ² , A ³ , A ⁴ and A ⁵
May have a substituent and may be the same or different. Examples of the substituent include an alkyl group, an aryl group, an aralkyl group, an alkenyl group, an alkynyl group, a halogen atom, an acyl group, an alkoxycarbonyl group, an aryloxycarbonyl group, a sulfo group, a carboxy group, a hydroxyl group, an alkoxy group, and an aryloxy group. Amide group, sulfamoyl group, carbamoyl group, ureido group, amino group, sulfonamide group, sulfonyl group, cyano group, nitro group, mercapto group, alkylthio group and arylthio group. Preferred examples of A ¹ , A ² , A ³ , A ⁴ and A ⁵ include a 5- to 6-membered ring (pyridine,
Imidazole, thiozole, oxazole, pyrazine,
Each ring such as pyrimidine), and a more preferred example is a pyridine ring.

_BP represents a divalent linking group, and m is 0 or 1
Represents Examples of the divalent linking group include an alkylene group, an arylene group, an alkenylene group, —SO ₂ —, —SO—, and —O
—, —S—, —CO—, and —N (R ⁶ ) — (R ⁶ represents an alkyl group, an aryl group, or a hydrogen atom) alone or in combination. Preferred examples of B _p include an alkylene group and an alkenylene group.

R ¹ , R ² and R ⁵ each have 1 to 20 carbon atoms
Represents an alkyl group. R ¹ and R ² may be the same or different. The alkyl group represents a substituted or unsubstituted alkyl group, and the substituent is the same as the substituents described as the substituents for A ¹ , A ² , A ³ , A ⁴ and A ⁵ .

Preferred examples of R ¹ , R ² and R ⁵ include:
Each is an alkyl group having 4 to 10 carbon atoms. More preferred examples include a substituted or unsubstituted aryl-substituted alkyl group.

[0051] X _p ^- is a counter ion necessary to refer balancing the charge of the whole molecule, for example, it represents chlorine ion, bromine ion, iodine ion, nitrate ion, sulfate ion, p- toluenesulfonate, the oxalato or the like. n _p represents the number of counter ions required to balance the charge of the whole molecule, and n _p is 0 in the case of an internal salt.

[0052]

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The substituents R ₅ and R ₆ of the phenyl group of the triphenyltetrazolium compound represented by the general formula [T],
R ₇ is preferably a hydrogen atom or a compound having a negative Hammett sigma value (σP) indicating electron-withdrawing degree.

The Hammett's sigma value at the phenyl group is described in many literatures, for example, Journal of Medical chemistry.
Chemistry) 20, vol. 304, p. The group having a particularly preferable negative sigma value can be seen in a report by Hansch (C. Hansch) or the like. -0.15), a cyclopropyl group (-0.21), an n-propyl group (-0.13),
iso-propyl group (-0.15), cyclobutyl group (-0.15), n-butyl group (-0.16), iso
-Butyl group (-0.20), n-pentyl group (-0.1
5), cyclohexyl group (-0.22), amino group (-
0.66), acetylamino group (-0.15), hydroxyl group (-0.37), methoxy group (-0.27),
Ethoxy group (-0.24), propoxy group (-0.2
5), butoxy group (-0.32), pentoxy group (-
0.34), etc., each of which has the general formula [T]
Is useful as a substituent of the compound of

N represents 1 or 2, and examples of the anion represented by X _T ^n- include halogen ions such as chloride ion, bromide ion and iodide ion, nitric acid, sulfuric acid, and the like.
Acid radicals of inorganic acids such as perchloric acid, acid radicals of organic acids such as sulfonic acid and carboxylic acid, anionic activators, specifically p-
Lower alkylbenzene sulfonic acid anions such as toluene sulfonic acid anion; higher alkyl benzene sulfonic acid anions such as p-dodecyl benzene sulfonic acid anion; higher alkyl sulfate anions such as lauryl sulfate anion; boric acid anions such as tetraphenyl boron; Dialkyl sulfosuccinate anions such as 2-ethylhexyl sulfosuccinate anion,
Examples thereof include higher fatty acid anions such as cetyl polyethenoxy sulfate anion, and polymers having an acid radical attached to a polymer such as polyacrylate anion.

Specific examples of the quaternary onium compound are shown below, but are not limited thereto.

[0057]

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[0058]

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[0059]

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[0060]

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[0061]

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[0062]

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[0063]

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[0064]

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[0065]

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[0066]

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The above quaternary onium compound can be easily synthesized according to a known method. For example, the above tetrazolium compound can be obtained from Chemical Reviews 55 p. 3
35-483 can be referred to.

The addition amount of these quaternary onium compounds is about 1 × 10 ^-8 to 1 mol, preferably 1 × 10 ^-7 to 1 × 10 ^-1 mol per mol of silver halide. These can be added to the light-sensitive material at any time from the time of silver halide grain formation to the time of coating.

The quaternary onium compound can be used alone or
More than one species may be used in combination. The compound may be added to any of the constituent layers of the photosensitive material, but is preferably added to at least one of the constituent layers on the side having the photosensitive layer, further to the photosensitive layer and / or an adjacent layer thereof.

In the present invention, the organic silver salt is a reducible silver source, and a silver salt of an organic acid and a hetero organic acid containing a reducible silver ion source, especially a long chain (10 to 30, preferably 15 to 30, Aliphatic carboxylic acids having 25 carbon atoms) and nitrogen-containing heterocycles are preferred. Organic or inorganic silver salt complexes wherein the ligand has a total stability constant for silver ions of 4.0 to 10.0 are also useful. An example of a suitable silver salt is Research
ch Disclosure No. 17029 and 2996
3, which include: salts of organic acids (eg, gallic acid, oxalic acid, behenic acid, stearic acid,
Salts of palmitic acid, lauric acid, etc.); carboxyalkylthiourea salts of silver (eg, 1- (3-carboxypropyl) thiourea, 1- (3-carboxypropyl)-
Silver complexes of polymer reaction products of aldehydes with hydroxy-substituted aromatic carboxylic acids (for example, aldehydes such as formaldehyde, acetaldehyde, butyraldehyde and salicylic acid, 3,5-dihydroxy benzylic acid) Hydroxy-substituted acids such as benzoic acid, 5,5-thiodisalicylic acid); silver salts or complexes of thioenes (eg, 3- (2-carboxyethyl) -4-hydroxymethyl-4-thiazoline-2-thioene and 3-carboxymethyl-4-methyl-4-thiazoline-2-thioene); imidazole, pyrazole, urazole, 1,2,4-thiazole and 1H-tetrazole, 3-amino-5-benzylthio-1,2,2
Complexes or salts of silver and a nitrogen acid selected from 4-triazole and benzotriazole; silver salts such as saccharin and 5-chlorosalicylaldoxime; and silver salts of mercaptides. Preferred silver sources are silver behenate, silver arachidate and / or silver stearate.

The organic silver salt compound can be obtained by mixing a water-soluble silver compound with a compound which forms a complex with silver.
A controlled double jet method as described in No. 3 is preferably used. For example, an organic acid alkali metal salt soap (eg, sodium hydroxide, potassium hydroxide, etc.)
Sodium behenate, sodium arachidate, etc.)
The soap and silver nitrate are added to produce organic silver salt crystals. At that time, silver halide grains may be mixed.

The silver halide grains in the present invention function as an optical sensor. In the present invention, in order to suppress white turbidity after image formation and to obtain good image quality, it is preferable that the average particle size is small, the average particle size is 0.1 μm or less, more preferably 0.01 to
0.1 μm, particularly preferably 0.02 to 0.08 μm.
The term "grain size" as used herein refers to the length of a ridge of a silver halide grain when the silver halide grain is a cubic or octahedral so-called normal crystal. If the crystal is not normal,
For example, in the case of spherical, rod-shaped, or tabular particles,
It refers to the diameter of a sphere equivalent to the volume of silver halide grains. Further, the silver halide is preferably monodispersed. Here, the monodispersion means that the degree of monodispersion determined by the following formula is 40% or less. The particles are more preferably 30% or less, particularly preferably 0.1% or more and 20% or less.

Monodispersity = (standard deviation of grain size) / (average grain size) × 100 In the present invention, the silver halide grains have an average grain size of 0.1.
It is more preferable that the particle size is not more than μm and that the particles are monodisperse particles. When the particle size falls within this range, the granularity of the image is also improved.

The shape of the silver halide grains is not particularly limited, but the proportion occupied by the Miller index [100] plane is preferably high, and this proportion is 50% or more, more preferably 7%.
It is preferably at least 0%, particularly preferably at least 80%. The ratio of the Miller index [100] plane is determined by T.M. using the dependence of the adsorption of the sensitizing dye on the [111] plane and the [100] plane. Tani; Imaging Sci. , 29,
165 (1985).

Another preferred form of silver halide is tabular grains. The term “tabular grain” as used herein means that the square root of the projected area is defined as a particle size r μm, and the thickness in the vertical direction is h.
The aspect ratio = r / h in the case of μm is 3 or more. Among them, the aspect ratio is preferably 3 or more and 50 or less. The particle size is preferably 0.1 μm or less, and more preferably 0.01 to 0.08 μm. These are disclosed in U.S. Pat. Nos. 5,264,337;
Nos. 314,798 and 5,320,958, and the like, and the desired tabular grains can be easily obtained. When these tabular grains are used in the present invention,
Further, the sharpness of the image is improved.

The halogen composition is not particularly limited, and may be any of silver chloride, silver chlorobromide, silver chloroiodobromide, silver bromide, silver iodobromide, and silver iodide. The photographic emulsion used in the present invention is P.I. Chimie et by Glafkids
Physique Photographique (P
aul Montel, 1967); F. D
Photographic Emuls by uffin
ion Chemistry (The Focal P
Res., 1966); L. Zelikman
Making and Coating by et al
Photographic Emulsion (Th
e Focal Press, 1964) and the like.

The silver halide used in the present invention preferably contains an ion or a complex ion of a metal belonging to Group 6 to Group 10 of the Periodic Table of the Elements for the purpose of improving and adjusting the illuminance failure. The above metals include W, Fe, C
o, Ni, Cu, Ru, Rh, Pd, Re, Os, I
r, Pt, and Au are preferred.

The photosensitive silver halide grains can be obtained by a noodle method,
Desalting can be performed by washing with a method known in the art, such as a flocculation method, but in the present invention, desalting may or may not be performed.

The photosensitive silver halide grains in the present invention are preferably chemically sensitized. Preferred chemical sensitization methods include sulfur sensitization, selenium sensitization, tellurium sensitization, and noble metal sensitization such as gold compounds, platinum, palladium, and iridium compounds, as well known in the art. A sensitization method can be used.

In the present invention, in order to prevent devitrification of the light-sensitive material, the total amount of silver halide and organic silver salt is preferably 0.5 g or more and 2.2 g or less per m ² in terms of silver. . With this range, a high-contrast image can be obtained. The amount of silver halide relative to the total amount of silver is at most 50% by weight, preferably at most 25%, more preferably between 0.1% and 15%.

It is preferable that a reducing agent is incorporated in the heat developing material of the present invention. Examples of suitable reducing agents are described in U.S. Patent Nos. 3,770,448, 3,773,512, 3,593,863, and Research Dis.
Closure Nos. 17029 and 29996, and include the following.

Aminohydroxycycloalkenone compounds (eg, 2-hydroxy-3-piperidino-2-cyclohexenone); aminoreductone esters (eg, piperidinohexose reductone monoacetate) as precursors of reducing agents N-hydroxyurea derivatives (e.g., Np-methylphenyl-N-hydroxyurea); hydrazones of aldehydes or ketones (e.g., anthracenaldehyde phenylhydrazone); phosphoramidophenols; phosphoramidoanilines; Hydroxybenzenes (e.g., hydroquinone, t-butyl-hydroquinone, isopropylhydroquinone and (2,5-dihydroxy-phenyl) methylsulfone); sulfhydroxamic acids (e.g., benzenes Sulfonamidoanilines (eg, 4- (N-methanesulfonamido) aniline); 2-tetrazolylthiohydroquinones (eg, 2-methyl-5- (1-phenyl-5-tetrazolylthio) hydroquinone Tetrahydroquinoxalines (eg, 1,2,3,4-tetrahydroquinoxaline); amide oximes; azines; combinations of aliphatic carboxylic acid arylhydrazides and ascorbic acid; combinations of polyhydroxybenzene and hydroxylamine; Reductone and / or hydrazine; Hydroxanoic acids; Combinations of azines and sulfonamidophenols; α-cyanophenylacetic acid derivatives;
A combination of -naphthol and a 1,3-dihydroxybenzene derivative; 5-pyrazolone; a sulfonamide phenol reducing agent; 2-phenylindane-1,3-dione and the like; chroman; 1,4-dihydropyridines (for example,
2,6-dimethoxy-3,5-dicarbethoxy-1,
4-dihydropyridine); bisphenols (for example,
Bis (2-hydroxy-3-t-butyl-5-methylphenyl) methane, bis (6-hydroxy-m-tri) mesitol, 2,2-bis (4-hydroxy-3-methylphenyl) propane , 4,4-ethylidene-bis (2-t-butyl-6-methylphenol), ultraviolet-sensitive ascorbic acid derivatives; hindered phenols; 3-pyrazolidones. Among them, particularly preferred reducing agents are hindered phenols. Examples of the hindered phenols include compounds represented by the following general formula (A).

[0083]

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In the formula, R represents a hydrogen atom or a group having 1 to 1 carbon atoms.
10 alkyl group (e.g., -C ₄ H _9, 2,4,4-trimethyl pentyl) represents, R 'and R "is an alkyl group having 1 to 5 carbon atoms (e.g., methyl, ethyl, t- butyl ).

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

[0086]

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[0087]

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The amount of the reducing agent such as the compound represented by the general formula (A) is preferably 1 × 1 mol per mol of silver.
It is 10 ^-2 to 10 mol, especially 1 × 10 ^{-2 to} 1.5 mol.

Binders suitable for the photothermographic material of the present invention are transparent or translucent, generally colorless, and include natural polymer synthetic resins, polymers and copolymers, and other film-forming media such as gelatin, gum arabic,
Poly (vinyl alcohol), hydroxyethyl cellulose, cellulose acetate, cellulose acetate butyrate, poly (vinyl pyrrolidone), casein, starch, poly (acrylic acid), poly (methyl methacrylic acid), poly (vinyl chloride), poly (methacrylic acid) ), Copoly (styrene-maleic anhydride), copoly (styrene-acrylonitrile), copoly (styrene-butadiene), poly (vinyl acetal) s (eg, poly (vinyl formal) and poly (vinyl butyral)), poly (ester) ), Poly (urethane), phenoxy resin, poly (vinylidene chloride), poly (epoxide),
Poly (carbonate) s, poly (vinyl acetate),
There are cellulose esters and poly (amides).

[0091] The binder may be hydrophilic or hydrophobic, but in the present invention, it is preferable to use a hydrophobic transparent binder in order to reduce fog after thermal development. Preferred binders include polyvinyl butyral, cellulose acetate, cellulose acetate butyrate, polyester, polycarbonate, polyacrylic acid, polyurethane and the like. Among them, polyvinyl butyral, cellulose acetate, cellulose acetate butyrate, and polyester are particularly preferably used.

In order to protect the surface of the photosensitive material and prevent abrasion, a non-photosensitive layer can be provided outside the photosensitive layer. The binder used for these non-photosensitive layers may be the same as or different from the binder used for the photosensitive layers.

In the present invention, in order to increase the speed of thermal development, the amount of binder in the photosensitive layer is 1.5 to 10 g / m 2.
It is preferably ² . More preferably, 1.7 to 8
g / m ² . If it is less than 1.5 g / m ² , the density of the unexposed portion will increase significantly, and may not be usable.

In the present invention, a matting agent is preferably contained on the photosensitive layer side, and in order to prevent damage to the image after thermal development, it is preferable to provide a matting agent on the surface of the photosensitive material. It is preferable that the matting agent is contained in a weight ratio of 0.5 to 30% based on all binders on the photosensitive layer side. When a non-photosensitive layer is provided on the opposite side of the photosensitive layer with the support interposed therebetween, it is preferable that at least one layer on the non-photosensitive layer side contains a matting agent to prevent slippage of the photosensitive material and prevention of fingerprint adhesion. Also, it is preferable to provide a matting agent on the surface of the photosensitive material, and it is preferable that the matting agent is contained in a weight ratio of 0.5 to 40% with respect to all binders in the layer on the side opposite to the photosensitive layer side.

The shape of the matting agent may be either regular or irregular, but it is preferably regular and spherical.

The photothermographic material of the present invention has at least one photosensitive layer on a support. Although only the photosensitive layer may be formed on the support, at least one photosensitive layer may be formed on the photosensitive layer.
Preferably, a non-photosensitive layer is formed. In order to control the amount or wavelength distribution of light passing through the photosensitive layer, a filter dye layer on the same side as the photosensitive layer and / or an antihalation dye layer on the opposite side, a so-called backing layer, may be formed. Dyes or pigments may be included.

These non-photosensitive layers preferably contain the above-mentioned binder and matting agent, and may further contain a sliding agent such as a polysiloxane compound, wax and liquid paraffin.

In the photothermographic material of the present invention, various surfactants are used as a coating aid. Among them, a fluorine-based surfactant is preferably used for improving charging characteristics and preventing spot-like coating failure.

The photosensitive layer may be composed of a plurality of layers, and the sensitivity may be changed to a high-sensitivity layer / low-sensitivity layer or a low-sensitivity layer / high-sensitivity layer for adjusting the gradation.

Examples of suitable toning agents used in the present invention include:
Research Disclosure No. 17029
Issue.

The photothermographic material of the present invention contains a mercapto compound, a disulfide compound and a thione compound in order to control development, improve spectral sensitization efficiency, and improve storage stability before and after development. be able to.

The photothermographic material of the present invention may contain an antifoggant.

Various additives may be added to any of the photosensitive layer, the non-photosensitive layer, and other forming layers. The photothermographic material of the present invention may contain, for example, a surfactant, an antioxidant, a stabilizer, a plasticizer, an ultraviolet absorber, and a coating aid. These additives and the other additives mentioned above are Re
search Disclosure Item170
29 (p. 9-15, June 1978) can be preferably used.

The support used in the present invention may be a plastic film (for example, polyethylene terephthalate, polycarbonate, polyimide, nylon, cellulose triacetate) in order to obtain a predetermined optical density after development and to prevent deformation of the image after development. , Polyethylene naphthalate).

Among them, a preferred support is a support made of polyethylene terephthalate (hereinafter abbreviated as PET) and a plastic (hereinafter abbreviated as SPS) containing a styrene polymer having a syndiotactic structure. The thickness of the support is about 50 to 300 μm, preferably 70 to 180 μm.

Further, a heat-treated plastic support may be used. The plastics to be employed include the above-mentioned plastics. The heat treatment of the support means that after forming these supports and before the photosensitive layer is applied, at a temperature higher than the glass transition point of the support by 30 ° C. or more,
Preferably at a temperature higher than 35 ° C., more preferably 40 ° C.
It is preferable to heat at a temperature higher than ℃. However, the effect of the present invention cannot be obtained by heating at a temperature exceeding the melting point of the support.

In the present invention, a conductive compound such as a metal oxide and / or a conductive polymer can be contained in the constituent layer in order to improve the chargeability. These may be contained in any layer, preferably an undercoat layer,
A backing layer, a layer between a photosensitive layer and an undercoat, and the like.

[0107]

EXAMPLES Example 1 (Preparation of PET support) PET pellets were
After drying for an hour, it was melted at 300 ° C., extruded from a T-die, and quenched to prepare an unstretched film. This was longitudinally stretched 3.0 times using rolls having different peripheral speeds, and then horizontally stretched 4.5 times using a tenter. The temperatures at this time were 110 ° C. and 130 ° C., respectively. After this, 240 ° C
And then relaxed 4% in the transverse direction at the same temperature. Thereafter, the chuck portion of the tenter was slitter, and both ends were knurled and wound at 4 kg / cm ² . Thus, a roll having a width of 2.4 m, a length of 800 m, and a thickness of 100 μm was obtained. For a PET support having a thickness of 120, 175 μm or the like, the film thickness of the unstretched film was adjusted, and the rest was performed in the same manner as when the 100 μm support was produced.

(Preparation of Subbed PET Support) A corona discharge treatment of 8 W / m ² · min was applied to both sides of the PET film, and the following subbing coating solution a-1 was applied on one side to a dry film thickness of 0.3.
μm, and dried to form an undercoat layer A-1. On the opposite surface, an undercoat coating solution b-1 which has been subjected to the following antistatic treatment is applied so as to have a dry film thickness of 0.3 μm. And dried to obtain an antistatic subbing layer B-1.

<< Undercoat Coating Solution a-1 >> Butyl acrylate (30% by weight) t-butyl acrylate (20% by weight) Styrene (25% by weight) Copolymer latex liquid of 2-hydroxyethyl acrylate (25% by weight) (Solid content 30%) 270 g (C-1) 0.6 g hexamethylene-1,6-bis (ethylene urea) 0.8 g polystyrene fine particles (average particle diameter 3 μm) 0.05 g colloidal silica (average particle diameter 90 μm) 0 0.1 g Finished to 1 L with water << Undercoat coating solution b-1 >> SnO ₂ / Sb (9/1 weight ratio, average particle size 0.18 μm) Amount to become 200 mg / m ² Butyl acrylate (30% by weight) Styrene ( 20% by weight) Glycidyl acrylate (40% by weight) copolymer latex liquid (solid content 30%) 270 g (C-1) 0.6 g hexa Styrene-1,6-bis (ethyleneurea) subsequently finished into 1L with 0.8g water, the undercoat layer A-1 and the upper surface undercoat layer B-1,
A corona discharge of 8 W / m ² · min. Was performed, and the following lower coating liquid a-2 was coated on the lower coating layer A-1 with a dry film thickness of 0.1 μm.
As the undercoat layer A-2, the undercoating layer B-1 is coated with the undercoating upper layer coating solution b-2 described below so as to have a dry film thickness of 0.8 μm. This was applied as a pull-up layer B-2.

<< Coating solution a-2 for lower undercoat >> Gelatin 0.08 g / m ² Weight (C-1) 0.2 g (C-2) 0.2 g (C-3) 0.1 g Silica particles ( (Average particle size: 3 μm) 0.1 g Finished to 1 L with water << Lower upper coating liquid b-2 >> (C-4) 60 g Latex liquid containing (C-5) as a component (solid content: 20%) 80 g Ammonium sulfate 5g (C-6) 12g Polyethylene glycol (weight average molecular weight 600) 6g Finish to 1L with water

[0111]

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[0112]

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(Heat Treatment of Support) In the above-described undercoat drying step of the support, the support was heated at 140 ° C.
Thereafter, it was gradually cooled. 0.12μ as the thickness of the undercoat
m.

(Preparation of silver halide emulsion A) 900 m of water
7.5 g of inert gelatin and 10 ml of potassium bromide
After dissolving mg and adjusting the temperature to 35 ° C. and the pH to 3.0, 370 ml of an aqueous solution containing 74 g of silver nitrate and (60/3
An aqueous solution containing sodium chloride, potassium bromide, and potassium iodide in a molar ratio of 8/2) and [Ir (NO) Cl ₅ ] salt were added in an amount of 1 × 10 ⁻⁶ mol per mol of silver and rhodium chloride was added to silver 1 mol. 1 × 10 ⁻⁶ mol per mol was added by the controlled double jet method while keeping the pAg at 7.7.
Thereafter, 4-hydroxy-6-methyl-1,3,3a, 7
7. Add tetrazaindene and adjust the pH to 8. with NaOH.
0, reduction sensitization is performed by adjusting pAg to 6.5,
A silver halide emulsion A was obtained. Emulsion A was cubic silver iodobromide grains having an average grain size of 0.06 μm, a monodispersity of 10%, a variation coefficient of projected diameter area of 8%, and a [100] face ratio of 87%. This emulsion A was subjected to coagulation sedimentation using a gelatin coagulant to perform a desalting treatment.

(Preparation of Na Behenate Solution) In 945 ml of pure water, 32.4 g of behenic acid, 9.9 g of arachidic acid and 5.6 g of stearic acid were dissolved at 90 ° C. Next, while stirring at a high speed, 98 ml of a 1.5 M aqueous sodium hydroxide solution
Was added. Next, 0.93 ml of concentrated nitric acid was added.
C. and stirred for 30 minutes to obtain a sodium behenate solution.

(Preparation of Preform Emulsion of Silver Behenate and Silver Halide Emulsion A) 15.1 g of the silver halide emulsion A was added to the above sodium behenate solution, and the pH was adjusted to 8.1 with a sodium hydroxide solution. After the adjustment, 147 ml of a 1 M silver nitrate solution was added over 7 minutes, the mixture was further stirred for 20 minutes, and water-soluble salts were removed by ultrafiltration. The resulting silver behenate was grains having an average grain size of 0.8 μm and a monodispersity of 8%. After the floc of the dispersion was formed, the water was removed, washed six times with water and removed, and then dried.

(Preparation of Photosensitive Emulsion) The preform emulsion thus obtained was divided, and a solution of polyvinyl butyral (average molecular weight: 3000) in methyl ethyl ketone (17w) was prepared.
t%) and the amount of toluene which is shown in Table 1 and 107 g of toluene.
Was gradually added and mixed, and then 0.5 mm size Z
With a media disperser using a rO ₂ bead mill, 400
Dispersion was performed at 0 psi at 30 ° C. for 10 minutes.

The following layers were simultaneously coated on both sides of the support to prepare a sample. The drying was performed at 60 ° C. for 15 minutes.

[Back surface side coating] A liquid having the following composition was coated on layer B-1 of the support.

Cellulose Acetate Butyrate (10% Methyl Ethyl Ketone Solution) Amount to become the film thickness in Table 1 Dye-A 7 mg / m ² Dye-B 7 mg / m ² Matting agent: Monodispersity 15% Average particle size 8 μm Monodisperse silica 90 mg / m ² C ₈ F ₁₇ (CH ₂ CH ₂ O) ₁₂ C ₈ F ₁₇ 50 mg / m ² C ₉ F ₁₇ -C ₆ H ₄ —SO ₃ Na 10 mg / m ²

[0121]

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[Coating on Photosensitive Layer Surface Side] Photosensitive layer 1: A solution having the following composition was coated on layer A-1 of the support.
Coating was performed so that the coated silver amount was 2.4 g / m ² .

Photosensitive emulsion 240 g Sensitizing dye (0.1% methanol solution) 1.7 ml Pyridinium bromide perbromide (6% methanol solution) 3 ml Calcium bromide (0.1% methanol solution) 1.7 ml Oxidizing agent ( 10 ml methanol solution) 1.2 ml 2- (4-chlorobenzoyl) benzoic acid (12% methanol solution) 9.2 ml 2-mercaptobenzimidazole (1% methanol solution) 11 ml tribromomethylsulfoquinoline (5% methanol solution) 17 ml hydrazine derivative (shown in Table 1) 0.4 g cyanovinyl compound 4.0 g high-contrast accelerator P-51 0.3 g phthalazine 0.6 g 4-methylphthalic acid 0.25 g tetrachlorophthalic acid 0.2 g having an average particle size of 3 μm Calcium carbonate 0.1 g A-4 (20% methanol solution ) 20.5 ml isocyanate compound (Mobay Corp., Desmodur N3300) 0.5 g

[0124]

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[Coating of Surface Protective Layer] A solution having the following composition was simultaneously applied so as to cover the photosensitive layer.

[0126] Acetone 5 ml / m ² methyl ethyl ketone 21 ml / m ² The amount of methanol 7 ml / m ² phthalazine 250mg / m ² A-4 have a film thickness shown in cellulose acetate butyrate Table 1 (20% methanol solution) 10 ml / m ² mat Agent: Monodispersity 10% Average particle size 4 μm Monodispersed silica 5 mg / m ² CH ₂ ＣＨCHSO ₂ CH ₂ CH ₂ OCH ₂ CH ₂ SO ₂ CH = CH ₂ 35 mg / m ² Fluorine surfactant C ₁₂ F ₂₅ (CH ₂ CH ₂ O) ₁₀ C ₁₂ F ₂₅ 10 mg / m ² C ₈ F ₁₇ -C ₆ H ₄ —SO ₃ Na 10 mg / m ² The smoother value of the surface on the photosensitive layer side is 25 mmHg, and that on the backing side is Surface smoother value is 200mm
Hg. The smoother value was measured by keeping the sample unexposed and humidifying at 23 ° C. and 48% RH for 2 hours, and measuring the smoother value of the surface on the photosensitive layer side in the same environment by using SM (manufactured by Toyo Denshi Kogyo KK). It measured by -6B.

Using the sample after forming the coating film, removing the binder, and observing with an electron microscope by a replica method, the organic silver particles were found to have a major axis diameter of 0.5 ± 0.05 μm.
m, tabular grains having a minor axis diameter of 0.4 ± 0.05 μm and a thickness of 0.01 μm are monodispersity of 5%, which is 90% of all organic silver grains.
Particles.

[Exposure and Development] Exposure was performed using a self-made laser sensitometer equipped with a 780 nm semiconductor laser. The exposure was a step exposure in which the exposure amount was logarithmically 0.1.

The development was carried out using a self-developed thermal self-developing machine shown in FIG. 1, and the development conditions were 110 ° C. and 20 seconds.

<< Measurement of Gamma γ and Fog >> The slope of a straight line connecting the densities 1.0 and 1.5 of the characteristic curve was defined as gamma γ representing leg cut. Fog is applied to the photosensitive material processed at 110 ° C for 20 seconds under X-Rite within 1 hour after processing.
Of white light.

<< Evaluation of Shrinkage >> About 500 mm × 4 before processing
The length of a 40 mm photosensitive material in the length direction of 500 mm (the longitudinally stretched side of PET) was conditioned at 23 ° C. in a 50% atmosphere for 2 hours, and the length was measured. After that, the film was subjected to a heat development treatment under the above conditions, and conditioned at 23 ° C. and 50% atmosphere for 2 hours.
The length was measured. The length of the light-sensitive material was converted to 1 m and the amount of shrinkage was described in the table.

(Length before processing)-(Length after thermal development processing) was defined as shrinkage (converted per m of photosensitive material).

<< Evaluation of transportability >> 500 mm × 440 mm
The photosensitive material of each size was processed 50 sheets each, and the number of sheets that had been wrapped around the rollers or jammed in the developing machine was counted. The results are shown in Table 1. EP, EC, B
C represents the thickness of the protective layer, photosensitive layer, and back layer, respectively.

[0134]

[Table 1]

As is clear from Table 1, the sample of the present invention has a high gamma, low fog, small shrinkage, and excellent transportability as compared with the comparative sample.

Example 2 A PET support of a photosensitive material was produced in the same manner as in Example 1. The photosensitive layer, the surface protective layer and the backing layer were prepared in Example 1.
Except that the hydrazine derivative was H-30.
It was used. The thickness of the photosensitive layer was adjusted by adjusting the amount of polyvinyl butyral when preparing the photosensitive emulsion.

The transport system of the self-developed thermal automatic developing machine described in Example 1 is a chopping roller so that the mounting position of the upper roller can be moved up and down, and the contact length between the roller of the developing section and the photosensitive material is reduced. As shown in Table 2. In addition, the contact length (rs) in the transport direction with all the transport rollers and / or all the heat rollers was measured according to the method described in the text.

[0138]

[Table 2]

Also in Table 2, the sample of the present invention is clearly superior to the comparative sample in all evaluation items.

Example 3 The contact length between the roller of the developing section and the photosensitive material was adjusted using a roller of the heat developing machine as an opposing roller and rubber rollers having different hardness. The same result as in Example 2 was obtained. Was.

[0141]

According to the present invention, the heat-developable photothermographic material can improve the shrinkage of the photothermographic material due to the heat development and the transportability of the photothermographic material in the photothermographic machine. Could be provided.

[Brief description of the drawings]

FIG. 1 is a sectional view of a thermal automatic machine used in an embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Thermal development part 2 Heating part 3 Cooling part 4 Roller 5 Urethane conveyance roller

Claims (5)

[Claims] 1. A photothermographic material containing organic silver particles, photosensitive silver halide particles, a reducing agent, a hydrazine derivative and / or a quaternary onium salt compound on a support, and a photographic structure coated on the support. The ratio p / s of the total thickness p of the layer to the thickness s of the support is 0.06 ≦ p / s ≦ 0.38
A photothermographic material comprising: 2. The development processing conditions in the thermal development section of the thermal development machine are 100 ° C. or more and 150 ° C. or less, and the path length (ps) of the thermal development section and all transport rollers and / or all of the thermal development section. Contact length in the transport direction with the heat roller (rs)
Ratio (rs / ps) is 0.04 ≦ rs / ps ≦ 1.4.
The photothermographic material according to claim 1, wherein 3. A photothermographic material comprising an organic silver particle, a photosensitive silver halide particle, a reducing agent, a hydrazine derivative and / or a quaternary onium salt compound on a support. The development processing conditions in the thermal development section of the machine are 100 ° C. or more and 150 ° C. or less, and the path length (ps) of the thermal development section and all the transport rollers and / or
Or the contact length (r
s) is in the range of 0.04 ≦ rs / ps ≦
A method for processing a photothermographic material, wherein the material is 1.4. 4. The support has a thickness of 110 μm or more and 150 μm or more.
3. The photothermographic material according to claim 2, wherein the thickness is not more than μm. 5. The support has a thickness of 110 μm or more and 150 μm or more.
4. The method for processing a photothermographic material according to claim 3, wherein the thickness is not more than μm.