JPH03279941A - Direct positive type silver halide photographic sensitive material - Google Patents

Abstract

PURPOSE:To obtain the same sensitometry characteristics independently of a duplicator used by rendering a specified value to gamma connecting two points each having a specified optical density and linearity to a characteristic curve connecting the two points. CONSTITUTION:A dye having max. absorption at 200-600 nm wavelength is incorporated into a layer closest closest to a base on the silver halide photographic emulsion side or at least one of layers on the other side. In the case of a characteristic curve obtd. by processing with specified developing and fixing soln. under specified conditions, a value of 0.9-1.1 is rendered to gamma (gamma) connecting a point having 0.03 optical density and a point having 1.50 optical density on the characteristic curve on an orthogonal coordinate system with equal unit lengths of optical density (D) and exposure (logE) as coordinate axes and linearity is rendered to a characteristic curve connecting the two points. A direct positive sensitive material fit for very rapid processing and having high suitability to copying is obtd.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a direct positive silver halide photographic light-sensitive material, and more specifically to a characteristic curve that provides good copyability (duplicate properties) in ultra-rapid processing. Linearity and gamma (
The present invention relates to a direct positive type silver halide photographic light-sensitive material in which γ) is adjusted.

[Background of the invention]

When a silver halide photographic light-sensitive material is exposed to light in its sensitive wavelength range and developed, the blackening density increases as the exposure dose increases, reaching a maximum value at a certain exposure dose, but in areas with higher exposure doses. In this case, a phenomenon in which the blackening density decreases is observed.

This phenomenon is called solarization.

Therefore, in a light-sensitive material in which a silver halide emulsion has been optically or chemically provided with appropriate development nuclei that will allow the blackening density to reach its maximum value, solarization occurs immediately upon exposure, and a positive image can be directly obtained. I can do it. A photosensitive material that utilizes such a reversal phenomenon is called a development nucleus destruction type direct positive type silver halide photographic photosensitive material (hereinafter referred to as a direct positive photosensitive material).

This type of direct positive light-sensitive material is used for copying various photographs, and is particularly useful as a duplicator film.

Essentially, a duplicator film must faithfully reproduce the image of the original film.

For this purpose, the characteristic curve must have gamma #1.0 and excellent linearity. However, in the past, exposure conditions have been adjusted to suit the exposure characteristics of each deublucator, and the current situation is that centometric characteristics vary greatly depending on the type of deublucator.

The reason for this is that since the dubricator generally has a high illuminance, light that has passed through the film is diffusely reflected and enters the film again, resulting in uneven exposure. By eliminating this variation, the linearity of the characteristic curve can be improved. However, since the exposure conditions, the type of light source, etc. differ depending on the type of duplicator, it is very difficult to obtain a constant characteristic curve.

Furthermore, in recent years, the consumption of silver halide photographic light-sensitive materials has continued to increase, and the number of sheets of light-sensitive materials to be processed has increased. There is a strong demand for an increase in the amount of processing within a certain amount of time.

This trend is no exception in the field of X-ray photosensitive materials; for example, the number of diagnoses is rapidly increasing due to the enforcement of periodic II* diagnosis, and the number of test items is increasing to make diagnoses even more accurate. This is because the number of shots is increasing.

There is also a strong demand for speeding up the production of direct positive photosensitive materials.
In order to meet this requirement, it is necessary not only to automate diagnosis (imaging, transportation, etc.) but also to directly impart rapid processing suitability to positive photosensitive materials.

However, if a direct positive light-sensitive material is subjected to rapid processing, for example, in a total processing time of 20 seconds to less than 60 seconds, a problem arises in that sensitivity decreases.

This decrease in sensitivity can be countered by increasing the amount of silver halide emulsion, but this naturally increases the film cost, as well as (a) insufficient fixing during development, and (b) water washing of the film. becomes insufficient, (C)
7 (Significant problems may occur, such as insufficient drying of the lum.

Therefore, in order to provide direct positive light-sensitive materials with suitability for rapid processing, it is necessary to develop a technique that does not cause a decrease in sensitivity and maximum density even when the amount of silver halide is reduced. As a method of achieving high sensitivity and saving silver, for example, U.S. Pat. No. 2,996.382 or U.S. Pat. No. 2,178,382 is known. It is said that by making silver halide grains with fogging nuclei exist adjacent to each other, it is possible to obtain a light-sensitive material with high sensitivity, high dust resistance, and high covering power.

However, when the light-sensitive material is processed at high speed in an automatic processor in which the total processing time (including the transition portion) is 20 seconds to less than 60 seconds, there are drawbacks such as high minimum density (fogging) and poor graininess.

As a means to improve the minimum density, it is known to use various additives in emulsions or developers, but all of them are undesirable because they cause a decrease in sensitivity, contrast, and maximum density. It is also known to increase the amount of gelatin in the binder as a means to further improve graininess, but this also has the disadvantage of decreasing sensitivity, gamma, and maximum density.

A direct positive light-sensitive material which has the above-mentioned good photographic properties and has good rapid processing properties has not yet been obtained.

[Purpose of the invention]

Therefore, an object of the present invention is to provide a direct positive type silver halide photographic material which can obtain similar sensitometric properties with any dublicator and is suitable for ultra-quick use.

[Structure of the invention]

As a result of intensive research, the present inventor has achieved the above objective by the present invention as described below.

That is, in a silver halide photographic light-sensitive material having at least one layer consisting of a silver halide photographic emulsion on one side of the support, the most Contains a dye having a maximum absorption wavelength between 200 and 600 nm in at least one of the nearby layers or the layers on the opposite side of the support, and the characteristics when processed under the following processing conditions. In the curve, the optical density (D) and the exposure amount (QogE) are on a rectangular coordinate system with equal unit lengths.In the characteristic curve, the optical density is 0.03.
The gamma (γ) connecting the points of 1.50 and 1.50 is from 0.9 to 1.1, and the characteristic curve connecting the points of optical density 0.03 to 1.50 has linearity. This is achieved by using a direct positive type silver halide photographic light-sensitive material.

[Processing conditions] Using the following developing solution and fixing solution, processing is carried out in a roller conveyance type automatic developing machine according to the following steps.

Treatment process Treatment temperature (°C) Treatment time (seconds)
Enter
1.2 Development + Transfer 35 14
．． 6 Fixation + crossing 33 8.2 Washer crossing 25 7.2 Slipping
IS 40
5.7 Drying
45 8.1 total
45.0 Developer potassium sulfite 55.0 g Hydroquinone 25.0 g 1-7 enyl-3-pyrazolidone 1.2 g Boric acid
10.0g Sodium hydroxide 2LOg Triethylene glycol
17.5g5-2) Lobenzimidazole 0. lOg glutaraldehyde bisulfite
15.0g glacial acetic acid 1
6-0g potassium bromide 4.0
g Triethylenetetramine Roki vinegar 2,5
g Add water to make IQ.

Fixer Ammonium thiosulfate 130.9g Anhydrous sodium sulfite 7.3g Boric acid
7.0g acetic acid (9 (1wt)
%) 5.5 g Disodium ethylenediaminetetraacetate 3.0 g Sodium acetate trihydrate 25.8 g Aluminum sulfate 18 hydrate
14.6g sulfuric acid (50vt%)
Add 6.77g of water to make IQ.

Gamma (γ) in the present invention is determined based on a characteristic curve drawn on a rectangular coordinate system in which the unit lengths of the coordinate axes of optical density (D) and logarithm of exposure (QOgE) are equal.

The above-mentioned γ means the slope of a straight line connecting the point on the characteristic curve at a concentration of base (support) concentration + head concentration + 0.03 and a point at a concentration of base concentration / head concentration + 1.50.

Expressed numerically, this straight line is the exposure axis (horizontal axis).
If the angle that intersects with is θ, then γ is given by tanθ.

Furthermore, linearity as used in the present invention refers to a point on the characteristic curve that has the same density as any point on the straight line on the drawing that connects the two optical density points that define the aforementioned gamma on this rectangular coordinate system. This means that the curve has a difference in the logarithm of the exposure amount (Δ12ogE) within 0.02 or less at most.

As the silver halide emulsion for obtaining the characteristic curve of the present invention, any conventionally developed emulsion may be used.

That is, the silver halide emulsion used in the present invention may be produced by any of the neutral method, acid method, and ammonia method. Further, a mixed method such as a single jet method, a double jet method, or a Chondroald double jet method can be used, but the Chondroald double jet method, in which particles are grown while controlling pH, pAg, etc., is particularly preferred.

When core/shell type emulsion grains are used, the silver halide composition may be any of silver chloride, silver chlorobromide, silver bromide, silver iodobromide, and silver chloroiodobromide. Silver chloride, silver chlorobromide, silver bromide, and silver chloroiodobromide are preferred, and silver chlorobromide containing 0 to 80 mol % of silver bromide is particularly preferred. Further, the silver halogenide grains may be monodisperse or polydisperse.

The shell may have any silver halide composition as long as it has a smaller solubility product than the 7% silver halide of the core, but silver bromide or silver iodobromide is preferred.

(In the case of silver iodobromide, the silver iodide content is preferably 6 mol% or less.) The molar ratio of shell to core is 1:100 to 10:1, preferably 1:10 to 5
:1.

The crystal phase after shell formation may be cubic, tetradecahedral, octahedral, or any other normal crystal shape, and the grain size may be 0.
．． 1-2.0 μm, preferably 0.15-10 pm.

In addition, in the present invention, in order to obtain a good positive i-image,
Any suitable electron trap can be used. This is effective in preventing reactions in which silver nuclei form and grow between photoelectrons and silver ions. As specific means, noble metal atoms or the like may be introduced as an inorganic desensitizer into the crystal interior of the silver halide grains, or an electron-capture desensitizing dye that is adsorbed on the crystal surface may be used.

When an inorganic desensitizer is used, in order to incorporate the inorganic desensitizer into the silver rhodanide grains, a Group (I) soluble metal salt, such as a soluble rhodium salt or a soluble iridium salt, may be added. These soluble salts preferably contain from 10-' to 10-'11OQ or more preferably L per mole of silver halide.
<Ha10-'-10-"+oQ is best added,
It is desirable to add this as an aqueous solution to the emulsion during the preparation of silver halide grains.

For techniques using electron-capture desensitizing dyes, see
British Patent No. 1,186,717, British Patent No. 1,186,714
No. 1,186,716, No. 1,520.817, U.S. Patent No. 3,501゜306, No. 3,501.30
No. 7, No. 3,501,310, No. 3,531.

It is described in No. 288, etc.

A suitable fog is imparted to the silver halide emulsion used in the present invention, using a reducing agent and a gold compound for the silver halide emulsion. After being coated with at least one compound selected from thiosulfate and/or thionanate, or after being coated with a reducing agent and a gold compound, thiosulfate and/or thionanate is formed. Even better fogging can be imparted by containing at least one or more selected compounds.

In the present invention, fog is imparted by the above-mentioned method, but by adding a water-soluble iodide to the 7-silver halide emulsion before fogging, good "bleeding" can be obtained. Water-soluble iodides include ammonium, potassium, lithium, and sodium iodides, and the amount added is 1-10 mM of water-soluble iodide per halogenated-I Mof2.
It is 1. If the amount added is less than this, the removal will be poor.

If the amount is more than this, a sufficient maximum concentration cannot be obtained and the concentration decreases during storage.

The conditions for fogging the silver halide can vary widely, but the pH is generally within the range of 5.5 to 9, preferably 6 to 7. Also, pAg is generally 6.5 to 8.5
The temperature is generally in the range of 40°C to 100°C, preferably 50°C to 70°C.

A hydrophilic protective colloid, such as gelatin, which suspends the silver halide grains during fogging, is used to suspend silver halide grains during fogging.
It is preferably used at a ratio of 30 to 200 g per 2 g.

Reducing agents used in the present invention include aldehyde compounds such as formalin, hydrazine, triethylenetetramine,
Organic reducing agents such as organic amine compounds such as thiourea dioxide and imino-amino-methanesulfinic acid, inorganic reducing agents such as stannous chloride, or reducing agents such as amineporan are preferably used.

The concentration of the reducing agent used varies depending on the silver halide grains, application purpose, etc., and also varies depending on the type of reducing agent, but is generally 0.001 mol per mole of silver halide.
It is within the range of ~1.00mMoff.

The gold compounds used in the present invention are monovalent and trivalent soluble gold salts, such as chloroauric acid, thionean fusion, chlorfinan sodium, chlorfinancial potassium, brominefinancial potassium, iodofinancial potassium, gold cyanide potassium, gold Potassium thioneanide, sodium thiomalein fusion, gold thioglucose, etc. are used.

The amount of this gold compound to be used varies depending on the size composition of the silver halide grains, the purpose of application, etc., but is generally within the range of 0.0001-0.1 mmof2 per silver halide I Mo12, preferably 0. .005~0.05mMo
(Good results are obtained when used at low concentrations within the range of 1.

Further, as specific examples of thiosulfate and thionanate used in the present invention, sodium thiosulfate, ammonium thiosulfate, potassium thiocyanate, ammonium thiocyanate, or complex salts thereof, etc. are preferably used, and these compounds is generally) 0.00 per 10 silver genenide I MoQ
03-10.0mMoff, preferably 0005-0.5mMo12.

The timing of using these thiosulfate and thio/anate salts is before adding a fog with the reducing agent and gold.
Alternatively, the required amount may be added during fog formation or after fog formation.The amount required varies depending on the time of use.In particular, when adding after fog formation, the amount must be increased.

The gamma of the direct positive light-sensitive material of the present invention can be adjusted using conventional techniques by controlling the emulsion composition, grain size distribution, chemical sensitization, and additive conditions.

Furthermore, adjustment of linearity can be obtained by mixing at least two emulsions with predetermined approximately equal gammas given by the above-described method by adjusting the mixing ratio.

In the direct positive light-sensitive material of the present invention, a layer containing a dye having a maximum absorption wavelength of 200 to 600 .mu.m is provided close to or in contact with the surface of the support.

These compounds have, for example, the following general formula [a].

(b) and Cc), and specific dominant compounds are as shown below, but are of course not limited to these.

General formula Ca) (CHz)m+ child group, where X and Y are hydrogen atoms, alkyl groups, /anoalkyl groups, carboxynealkyl groups, sulfoalkyl groups, hydroquinoalkyl groups, halogenated alkyl groups, or substituted It represents an alkyl group or its sodium or potassium salt, and R2 and R1 are hydrogen atoms, halogen atoms,
represents an alkyl group, a hydroxy group, an alkoxy group, an alkylthio group, or a group similar to the above 10x group, and Q is at least one halogen atom, a carboxyne group, a sulfo group,
or a sulfoalkyl group, a phenyl group substituted with a sodium or potassium salt thereof, a sulfoalkyl group, a sulfoalkoxyalkyl group, a sulfoalkylthioalkyl group, or an optionally substituted methine group. R4 is an alkyl group, a carboxy group, an alkyl group or an alkyl group
& or represents an acyl-substituted, sulfo-substituted, or unsubstituted amino group. ml represents an integer of 0.1, 1 or 2, m represents an integer of 0 or 1, respectively.

General formula (b) In the formula, R, , R, , R□R2 and R1゜ are hydrogen atoms, halogen atoms, alkyl groups, hydroxyl groups, alkoxy groups, amino groups, acylamino groups, carboxyl groups or sulfone groups, or Represents sodium and potassium salts. R7
represents an alkyl group or a carboxyl group.

General formula (c) In the formula, R□ and R12 represent an alkyl group, a substituted alkyl group, an aryl group, an alkoxycarbonyl group, or a carboxyl group, and R□ and R1 are substituted with a sulfonic acid group or a carboxyl group. Represents an alkyl group, a sulfonic acid group, an aryl group substituted with a carboxyl group or a sulfonic acid group, or its sodium or potassium salt,
L represents a substituted or unsubstituted methine chain. M represents sodium, potassium or hydrogen atom; m represents O or 1;

Compounds according to general formulas [a), (b), and (c) below, and ultraviolet absorbing compounds represented by general formulas (u+), (uz), and (Ul) below in the sense of preventing discoloration of dyes in the present invention It is preferable to add an agent.

2 In the formula, R1 is a hydrogen atom, an alkyl group, a substituted alkyl x,
R2 represents an alkyl group or a halogen-substituted alkyl group, and R3 represents a hydrogen atom, a halogen atom, or an alkyl group.

General formula [U2] Author 4 In the formula, R4 represents an alkyl, hydroxyalkyl, cyanoalkyl, or sulfoalkyl group, and Z represents oxazole,
Thiazole, benzoxazole, benzothiazole,
A represents an atomic group necessary to form an imidazole or benzimidazole ring, and a pyrrole ring or pyrrolidine ring.

General formula [U,] In the formula, Rs, Ra, Rt, and Ra represent an alkyl group, a hydroquine alkyl group, a cyano group, an alkylcyano group, an alkoxy7 group, or a sulfoalkyl group. R9 and R1° represent a sulfonic acid group or an alkylsulfonic acid group. Next, specific compound examples are shown.

The direct positive light-sensitive material of the present invention has at least one silver halide emulsion layer on one side of the support and a backing layer of a non-photosensitive hydrophilic colloid layer on the other side. I can do it. A matting agent can also be contained on both sides.

That is, at least one layer on the side of the silver halide emulsion layer and at least one layer on the side of the backing layer.
The layer can contain matting agents.

Also, when each side of the support has one or more layers,
It is preferable that each matting agent is contained in the uppermost layer.

The matting agent used in the present invention is an organic matting agent, particularly,
Polymeric matting agents are preferred, but inorganic matting agents may also be used.

Specific examples of polymer matting agents used in the present invention include water-dispersible vinyl polymers such as polymethyl methacrylate, and cellulose acetate propionate,
Starch and the like are preferably used. In particular, water-dispersible vinyl polymers such as homopolymers of acrylic esters such as methyl methacrylate, fringyl acrylate, fringyl acrylate, and chrycidyl methacrylate, or copolymers of these acrylic esters or copolymers with other vinyl monomers. Consolidated spherical 77 particles are preferred.

As the inorganic compound matting agent, silver halide, barium strontium sulfate, calcium carbonate, silicon dioxide, magnesium oxide, titanium oxide, etc. are preferably used.

More specifically, the present invention is described in British Patent No. 1,055.
No. 713, U.S. Patent No. 1,939,213, U.S. Patent No. 2.99
2,101, 3,767.448, etc., West German Patent No. 2,529,321, British Patent No. 760,775, 1.

No. 260.772, U.S. Pat. No. 1.2'01,905;
Inorganic 77 agents described in JP 2,192,241, JP 3,053,662, JP 3,769,020, JP 4,029,504, etc. can be preferably used.

In the direct positive light-sensitive material of the present invention, the thickness of the backing layer is preferably 0.1 to IO μm, and the amount of the soot agent contained on the side having the backing layer is 0.005-10 μm.
1 g/m2 or preferably 0.01-0.1 g/m2
m' is more preferred.

On the side having the silver halide emulsion layer of the direct positive light-sensitive material of the present invention, it is preferable to provide a protective layer on the silver halide emulsion layer, and the protective layer or the uppermost layer contains a mantle agent. is preferred. The content of the matting agent on the side having the silver halide emulsion layer is 0.005 to 1 g/+
o2, more preferably 0.01 g/m'' to 0.01 g/m''.

In the present invention, the average grain size of the matting agent contained in the side having the silver halide emulsion layer is smaller than the average grain size of the matting agent contained in the side having the backing layer, and the ratio of the average grain size is , 1:1.5 or less is preferable. Furthermore, the ratio is preferably 1:2 or less. Further, the ratio of the amount of the matting agent on the emulsion layer side to the amount of the matting agent on the backing layer side may be arbitrary, but it is more preferable that the amount of the matting agent on the backing layer side is greater than the amount of the matting agent on the emulsion layer side.

Although the shape of the matting agent used in the present invention may be arbitrary, it is preferable that the matting agent on the emulsion layer side has a flat shape. The average grain size of the matting agent on the emulsion layer side is preferably 1.5 times or less the emulsion layer thickness plus the protective film thickness.

It is preferable that the particle size distribution of the matting agent used in the present invention is narrow. In particular, in the matting agent used on the emulsion side, it is preferable that the particle size distribution is narrow and the content of coarse-sized clotting agent particles is small. desirable.

Regarding the narrowness of the particle size distribution of the matting agent, where r is the average particle size and σ is the standard deviation of the particle size, a higher effect is obtained when (σ/r)<2, and 0.5<(σ/ r ) < 1,
Even higher effects can be obtained.

The average particle size of the matting agent can be measured using a conventional coal tar counter. It can also be directly measured using an electron microscope. In the latter case, especially when the particle is not spherical, its projected area is converted into a circle, and the diameter at that point is defined as the particle size.

Other photographic additives may also be added to the direct positive silver halide emulsion according to the present invention. As stabilizers, for example, those described in Japanese Patent Publication Nos. 49-16053, 49-12651, and 48-66828, triazoles, azaindenes, benzothiazolium compounds, mercapto compounds, or cadmium and cobalt. ,
Water-soluble inorganic salts such as nickel, manganese, zinc, etc. may also be included.

Further, as stimulants, for example, formalin, glyoxal, aldehydes such as mucochloric acid, S-triazines, epochinos, aziridines, vinyl sulfonic acid, etc., and as sensitizers, for example, Japanese Patent Publication Nos. 42-25203 and 43-10.
No. 245, No. 43-13822, No. 43-17926
It may also contain polyalkylene oxides and derivatives thereof selected from those described in No. 43-17927, No. 46-21186, No. 49-8102, No. 49-8332, etc. Furthermore, for example, the Special Publication Publication No. 45-249
It is also possible to contain a color coupler selected from those described in No. 10, No. 45-29878, and the like. In addition, brighteners, thickeners, preservatives, etc. can also be contained as necessary.

The silver halide emulsion according to the present invention is grafted with protective colloids such as gelatin, gelatin derivatives, polyvinyl alcohol, polyvinyl acrylate, polyvinylpyrrolidone, cellulose ethers, partially hydrolyzed cellulose acetate, and ethylene oxide as described in Japanese Patent Publication No. 4920530. Hydrophilic polymers such as N-hydroxyalkylene derivatives can be included.

Furthermore, a dispersion polymerized vinyl compound may also be included as a binder for emulsion. For example, a polymer latex of an unsaturated ethylenic monomer emulsion polymerized in the presence of an activator as described in Japanese Patent Publication No. 49-32344, Japanese Patent Publication No. 49-20964.
It is preferable from the point of view of improving the physical properties of the film to use the ceric salt described in the above issue to contain a polymer latex etc. in which a polymer compound having a hydroxyl group is grafted with an unsaturated ethylene 7th polymer. be.

Also, from the point of view of emulsion technology, Japanese Patent Publication No. 44-2523, No. 44
As described in No. 9499, the developer is protected and contained, higher fatty acids such as liquid paraffin and higher unsaturated fatty acids such as stearyl acetoglyceride are protected and contained to improve film properties, and color couplers and color couplers are added depending on the purpose. It is also possible to protect and contain stabilizers and the like.

The direct positive silver halide emulsion thus obtained can be applied to any suitable photographic support such as glass, wood, metal, film, e.g. cellulose acetate, cellulose acetate butyrate, cellulose nitrate, polyester, polyamide, polystyrene, etc. , paper, baryta-coated paper, polyolefin-coated paper such as polyethylene or polypropylene-coated paper, etc., and the polyolefin-coated paper can be subjected to electron bombardment treatment to improve the adhesion of the emulsion.

Known photographic additives can be added to the direct positive silver halide emulsion according to the present invention.

Examples of known photographic additives include compounds described in Research Disclosure RD-17643 (1978) and RD-18716 (1979) shown in the table below.
18716 pages Classification Page Classification Chemical Sensitizers 23 III 648
Upper right sensitizing dye 23 rV 648
Right-649 Left Development Accelerator 29 XXI
648-Top right antifoggant 24 Vl
649 Lower right stabilizer 1/ //
//Filter dye 25~26■ 649 right~
650 Left whitening agent 24 V Hardening agent 26 X 651 Right coating aid 26-271 650 Right surfactant
// //Plasticizer 27
Tri //Slip agent /L Static inhibitor 27 , polycarbonate film, styrene film, baryta paper, paper coated with synthetic polymers, etc.

〔Example〕

Examples of the present invention will be described in detail below. Note that the present invention is not limited to the embodiments described below.

Example-1 Preparation of seed crystal A 60°CpA g=8.0. While controlling the pH to -2.0, the average particle size is 0.20μ using the double jet method.
Cubic grains of silver iodobromide containing 2 mol % of silver iodide of m were prepared. Gelatin in which 7 enyl carbonyl groups were condensed to 90% of the amine groups was added to the mixed solution and stirred for 3 minutes, and then 0.13 g/AgX I Mo (l) of potassium hydroxide was added to adjust the pH to 4.0. After standing and decantation, add 40°C pure water 2.IQ/^gX, 1 mol potassium uraram hydroxide 0.25g/AgX I MoQ, adjust the pH to 5.8, and stir for 5 minutes. Then, add nitric acid. (
1.7N) was added to 1.5mQ/AgXIMo(l) and the pH-
Set it to 4.3 and leave it still. Decanted. Furthermore, gelatin and 0.2 g of potassium hydroxide/AgX IMo+2 were added, the pH was adjusted to 5.8, and the mixture was redispersed to obtain seed crystals A.

Growth from Seed A-1 The above-mentioned seed crystals were dissolved in a gelatin solution kept at 40°C, and ammonia was further added to adjust the pH to -8.0.

Rhodium trichloride and potassium hexachloroiridate were added to this solution as shown in Table 1, and after 2 minutes, an ammoniacal nitric acid aqueous solution of IN and an aqueous potassium bromide solution of IN were added by a double jet method. The pH during mixing was 8.0. EAg
is controlled to the values shown in Table 1.

After the mixing was completed, the pH was lowered to 6.0 with acetic acid. Thereafter, desalting was performed in the same manner as for the seed crystals to obtain emulsions E-1 to E7.

Preparation of Seed Crystals B, C, and D Seed Crystals B (particle size: 0.30 μl) were obtained in exactly the same manner except that the temperature and mixing time were changed.

Growth from Seed Crystal B Growth from Seed Crystal A The same method as in I was used to obtain emulsions E-8 and E-9 with finished grain sizes of 0.30 and 0.50 μm.

Growth from Seed A-2 Emulsions E-10 and 11 were grown in exactly the same manner as in Growth from Seed A-1 except that an aqueous IN mixture of potassium iodide and potassium bromide was used instead of the IN potassium bromide aqueous solution. I got it. The silver iodide content after shell formation is as shown in Table 1.

(Preparation of emulsion E-12) (d) Acetic acid Amount to neutralize to pH 6.5 First, at 40℃ Add (b) liquid to (b) liquid and stir. Even more so (ha) The liquid was added over 20 minutes.

After aging for 30 minutes, solution (2) was added to neutralize the mixture to pH 6.5.

Emulsion E-12 above was also desalted in the same manner as Seed Crystal A.

Each emulsion obtained as above was adjusted to pH 6.8.
Thiourea dioxide per mole of AgX at 0°C.
3 mg sodium thiosulfate 1.2 mg and chloroauric acid 1.
5 mg was added and aged until a proper fog was obtained.

Using the above particles, an emulsion coating solution containing additives was prepared according to the composition shown below.

Further, a coating solution for a backing layer was prepared by containing the following additives. Furthermore, a protective layer solution having the composition shown below was prepared.

A silver halide emulsion layer and a protective layer are formed on one side of the support using an emulsion coating solution and a protective layer solution, and a backing layer is formed on the opposite side from the emulsion layer using a backing layer solution. A sample was prepared by forming a That is, the emulsion coating liquid was coated at a speed of 140 m/min so that the amount of silver was 3.2 g/m'' per side, and the protective layer liquid was 0.98 g/+a' gelatin per side, and the coating was applied in the opposite direction to the emulsion layer. Add backing layer liquid to the side and gelatin amount is 3g/unit area.
Sample No. 1 to Sample No. I in Table 2 were coated at the same time in multiple layers at a speed of 140 m/min and dried.
I got an O.

Table 2 also shows comparative samples A and B in which the dye of the present invention was not added to the backing layer.

(Backing layer liquid composition) Backing dye (g) (h) (j) Polymethyl methacrylate particles (matting agent with average particle size of 5 μm) added in an amount of (a) lime-treated inert gelatin 3 g/m” per 1Q coating solution 1.1 g (k) Aqueous formalin solution (35%) (12) Aqueous glyoxal solution (40%) (m) Sodium chloride (composition of emulsion coating solution) Lime-treated ossein gelatin 4-hydroxy-6-methyl per 1 c of coating solution -1,3,3a,7-thitrazaindene silver halide emulsion (in terms of silver) (IJ 0.8m12 0.9mQ 1g 1.2g 0.6 mol Nitrone Styrene and butane diene copolymer fine particles (average particle size 0.03 μm ) Copolymer of styrene and maleic acid 0.05 g 2.5 g 1.5 g (Protective layer solution) 8 g of lime-treated inato gelatin per coating solution iQ, g of acid-treated gelatin Ludox AM (colloidal silica, manufactured by DuPont) 30 g of polymethyl methacrylate particles ( Projected area average particle size 2.0μm) <Matting agent> 1.2g
Exposure Conditions The samples thus obtained were each exposed to light using a duplicator. The duplicator was a 7-unit printer manufactured by Konica Medical Co., Ltd., and the image was exposed using a sensitometric light wedge using a duplicator manufactured by Konica Corp., and then developed for 45 seconds using the above-mentioned development and fixing solution using a 5RX501 automatic processor manufactured by Konica Corp. went. The evaluation of exposure latitude at this time is that the optical density is the pace density and the fog density + 0.0.
It is expressed as the difference in exposure amount (logarithm display) between 3 and 1.5.

Table 2 shows the values.

Evaluation of linearity The linearity of the characteristic curve of each sample described above is evaluated by determining the characteristic curve whose density is the same as any point on the straight line connecting the two optical density points that define the gamma mentioned above on the rectangular coordinate system. It was expressed as the maximum value of the difference in the logarithm of exposure (ΔflogE) at the upper point. When this value is 0.02 or less, linearity is excellent.

Table Example-2 The following dyes were added to the banking layer of the emulsion prepared in Example-1 in the same manner as in Example-1, except for Example-1.
A sample was prepared using the same emulsion additives as in Example 1, the same protective layer, and the same backing layer except for the dye, and was coated and dried in the same manner. This was tested and evaluated in the same manner as in Example-1.

The results are as shown in Table 3. It was the same.

[Dye added to backing layer] Coating liquid 1 Q hit table 〔Effect of the invention〕 According to the configuration of the present invention, Multiplex suitable for ultra-quick processing A direct positive photosensitive material with good workability can be obtained.

Claims (1)

[Claims] (1) In a silver halide photographic material having at least one layer made of a silver halide photographic emulsion on one side of the support, the layer closest to the support on the side having the silver halide photographic emulsion or the support At least one of the layers on the opposite side of the body contains a dye having a maximum absorption wavelength between 200 and 600 nm, and in the characteristic curve when processed under the following processing conditions, the optical density (D) and the exposure dose (logE) on a characteristic curve on a rectangular coordinate system with the same unit length, the gamma (γ) connecting the point of optical density 0.03 and the point of optical density 1.50 ranges from 0.9 to 1.
．． 1, and a direct positive silver halide photographic light-sensitive material characterized in that a characteristic curve connecting points having an optical density of 0.03 to 1.50 has linearity. [Processing conditions] Using the following developing solution and fixing solution, processing is carried out in a roller conveyance type automatic developing machine according to the following steps. ▲There are mathematical formulas, chemical formulas, tables, etc.▼ Triethylenetetraminehexaacetic acid 2.5g Add water to make up to 1 liter. Fixer ammonium thiosulfate 130.9 g Anhydrous sodium sulfite 7.3 g Boric acid 7.0 g Acetic acid (90 wt%) 5.5 g Disodium ethylenediaminetetraacetate 3.0 g Sodium acetate trihydrate 25.8 g Aluminum sulfate 18 hydrate 14.6 g Sulfuric acid (50wt%) 6.77g Add water to make up to 1L.