JPH01241537A - Silver halide photographic sensitive material - Google Patents

Abstract

PURPOSE:To improve the sensitivity and the graininess of the title material by incorporating an emulsion particle having higher iodine content towards the outside of an emulsion layer and specified polymer and/or dextran in the emulsion layer contg. in the sensitive material. CONSTITUTION:The emulsion particle having higher iodine content towards the outside of the emulsion layer and the polymer and/or dextran having a repeating unit shown by formula I are incorporated in the emulsion layer contg. in the sensitive material respectively. In formula I, R<1> is hydrogen atom. or 1-6C alkyl group, R<2> and R<3> are each hydrogen atom. or <=10C a substd. or an unsubstd. alkyl, aryl or aralkyl group, and are the same or different with each other. And, R<2> and R<3> together with each other may form a nitrogen contg. heterocyclic ring together with nitrogen atom. L is (m+1) valent linking group, (n) is 0 or 1, (m) is 1 or 2. Thus, the image quality (especially the graininess) and the developing speed of the sensitive material are improved.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a silver halide photographic material having high sensitivity and good graininess.

(Prior Art) In general, it is important to improve the progress of development in silver halide photographic materials from the point of view of increasing the sensitivity.

Silver iodobromide emulsions are used in high-g photographic materials due to the trade-off between sensitivity and image quality. In particular, it can be seen that image quality (graininess in percentage) improves in emulsions in which the ratio of silver iodide increases toward the outer side.

However, development of such emulsions is slower than that of silver chloride or silver bromide, and how to improve this problem has been a major problem.

(Objective of the invention) It is an object of the present invention to provide a silver halide photographic JX light-sensitive material which has excellent image quality (graininess in %) and improved development progress.

(Structure of the Invention) The above aspects of the present invention are such that in a halogenated photographic material having at least seven layers of silver halide photographic emulsion III on at least one side of the support, the emulsion layer has a higher iodine content toward the outer side. Contains high emulsion grains and has the following general formula (I)
This can be achieved by a silver halide photographic material characterized by containing a polymer containing a repeating unit represented by: and/or dextran.

-a'K(I) R. An unsubstituted alkyl group and an aryl group represent an aralkyl group, and may be the same or different.Also, s
R2 and R3 may be bonded to each other to form a nitrogen-containing heterocycle together with the nitrogen atom. L is a linking group with m + /valence.

n is O, l is m, and/or m is λ. ) Preferred polymers of the present invention having repeating units represented by general formula (I) are shown below.

In general formula (I), R1 is a hydrogen atom or has 7 to 6 carbon atoms
represents an alkyl group, preferably a hydrogen atom or a methyl group.

R2 and R3 each represent a hydrogen atom, a substituted or unsubstituted alkyl group having 10 or less carbon atoms, an aryl group, or an aralkyl group, and may be the same or different. Substituents include hydroxyl group, lower alkoxy group, halogen atom,
Examples include an amide group, a cyanide group, a sulfonic acid group, a carboxylic acid group, and the like. R2 and R3 are preferably a hydrogen atom, a methyl group, an ethyl group, or a phenyl group, of which a hydrogen atom is most preferred.

L represents a divalent linking group, an example of which is a group having 7 to 7 carbon atoms.
Examples include monovalent groups obtained by combining zero alkylene groups, arylene groups, or these with ether bonds, ester bonds, amide bonds, etc.

n represents ot or l, with O being preferred.

m represents 1 or 2, preferably l.

Among the ethylenically unsaturated monomers forming one of the repeating units represented by the general formula (I), specific examples of preferred ones are listed below.

t, CH2=CH " 0NH2 ko, CH2=CH C0NHCH5 J, CH2=CH C0NHC2H5 屹 CH2=CH C0NHCH20H ri, CH3t o,
CH3 ■ CH2=C C0NHCH20CH3 CONH-C-CH2S 03 Na Summer H3 /2. CH3 /3. CH3 /￟ CH2=CH C0N(CH3)2 /O CH2=CH ■ C0NHC(CH3)2 /L CH3 ■ CH2=C C0NHCH2CH20H 7, CH3 The repeating unit represented by the general formula (I) is used as a polymer. It may contain two or more types of monomer units to exhibit a composite function.

The high molecular weight polymer in the present invention has a monomer represented by the general formula (I) as a polymer constituent unit, and has a molar ratio of 7θ or more,
It is preferably a compound represented by the following general formula (If) containing 10 moles or more, more preferably Q moles or more.

General formula (TI) In the formula, X represents a molar percentage, and preferably 70 to 100.

The person in the formula represents a monomer unit copolymerized with a copolymerizable ethylenically unsaturated monomer.

Examples of ethylenically unsaturated monomers in preferred polymers of the present invention C: ethylene, propylene, /-butene, isobutyne, styrene, chloromethylstyrene, hydroxymethylstyrene, sodium vinylbenzenesulfonate, sodium vinylbenzylsulfonate, N, N, N-) Limeter-N-vinylbenzylammonium chloride, N,
N-dimethyl-N-benzyl-N-vinylbenzylammonium chloride, α-methylstyrene, vinyltoluene, Hiro-vinylpyridine, -monovinylpyridine, benzylvinylpyridinium chloride, N-vinylacetamide, N-vinylpyrrolidone, l- and λ-methylimidazole, monoethylenically unsaturated esters of aliphatic acids (e.g. vinyl acetate, allyl acetate), ethylenically unsaturated monocarboxylic or dicarboxylic acids and their salts (e.g. acrylic acid, methacrylic acid, itaconic acid) , maleic acid, sodium acrylate, potassium acrylate, sodium methacrylate), maleic anhydride, esters of ethylenically unsaturated monocarboxylic or dicarboxylic acids (
For example, n-butyl acrylate, n-hexyl acrylate, hydroxyethyl acrylate, cyanethyl acrylate, N.

N-diethylaminoethyl acrylate, methyl methacrylate, n-butyl methacrylate, benzyl methacrylate, hydroxyethyl methacrylate, chloroethyl methacrylate, methoxyethyl methacrylate),
N,N-dimethylaminoethyl methacrylate, N,N
, N-triethyl-N-methacryloyloxyethylammonium-, -)luenesulfonate, N,N-diethyl-N-methyl-N-methacryloyloxyethylammonium-p-toluenesulfonate, dimethyl itaconate, monobenzyl maleate ester), etc., as well as JP-A No. 4-IJ-/RI No. 37, JP-A No. 77-10
Examples include gelatin-reactive monomers disclosed in Japanese Patent Application Laid-open No. 227 and Japanese Patent Application Laid-Open No. 2003-222012. Further, the polymer of the present invention may contain two or more types of monomer units as A in order to exhibit a composite function.

Preferred examples of compounds for the polymer in the present invention include the following. (The numbers represent mole percentages.

) Compound example (-CHzC+nr 0NH2 (P-j) H3 (p-r) (P-70) (P-//) H3 (P-/λ) (P-/J) (P-/≠) This invention The polymer having a repeating unit represented by the general formula (I) to be added to the photographic emulsion layer has a weight average molecular f
(MW) is from j,ooo to -20o,ooo, preferably from 7,000 to ioo.

000, more preferably /j, 000 to 70°000
The one is good. The amount of such a polymer to be added can be arbitrarily selected, but the amount of i&t to be added to improve developability varies depending on the type of photographic emulsion.

In the present invention, the dextran added to the photographic emulsion layer is
Dexton-producing bacteria such as Leuconostoc mesenteroides, or native dextrin isolated from the culture broth of these bacteria and obtained by acting on sucrose solution with dextran sucrase, are treated with acids, alkalis, and enzymes. The molecular weight is lowered by decomposition polymerization method. The weight average molecular weight of the dextran used in the present invention is 10,000 to 300,000. Preferably/! , 000 to -oo
, ooo.

The polymer and/or dextran having a repeating unit represented by the general formula CI) used in the present invention accounts for ! of all the binders in the photographic emulsion. It is preferable to add it in an amount of 10 to 202% by weight.

The polymer used in the present invention may be contained in as many layers as the photographic emulsion layer, but it is preferably contained in all photographic emulsion layers.

More preferably, the polymer density in the photographic emulsion layer in contact with the support (weight of polymer used in the present invention/weight of binder in the layer to which the polymer is added) is higher than the polymer density in other photographic emulsion layers. Smaller is better.

Even better results can be obtained if the non-photosensitive gelatin layer adjacent to the photographic emulsion layer also contains the polymer of the present invention.

When the polymer of the present invention is added to each layer of a photographic material, it is preferred that the binder ratio of the polymer/added layer is not significantly different from that of the adjacent layer.

In particular, the polymer density in the photographic emulsion 14 adjacent to the support is lower than the polymer density in other photographic emulsion layers, and the binder density in the photographic emulsion layer adjacent to the support is 30% by weight.
It is preferable that it is below.

The polymers of the present invention may be added to the outermost non-photosensitive gelatin layer, in which case the outermost 1# preferably has a lower polymer density than any other layer of the photographic material.

The polymer may be added to the emulsion at any time, but it is suitably added after grain formation and before coating.

The polymer may be added as a powder, but! It is convenient to use it as an aqueous solution.

The silver halide grains used in the silver halide emulsion of the present invention are characterized in that the iodine content is higher near the grain surface than inside the grain.

The iodine-containing forces within the particles may increase continuously from the inside of the particle outward, or may increase stepwise.

Particularly preferred forms are particles with a multilayer structure of two or more layers, such as particles with a so-called core/shell type structure.

When the outermost layer of the silver halide grain is the shell and the inner layer of the shell is the /j- or two or more layers of the partial core, the grains of the present invention have a higher iodine content in the shell part than in the core part. This means that particles in which the iodine content in the shell portion is higher than that in the core portion by i mol % or more, particularly 3 mol % or more are particularly preferred.

The iodine content of the shell part is ≠ mol% or more, especially 6
It is preferably mol% or more and 30 mol% or less.

The iodine content of the particles as a whole is preferably 3 mol % or more, more preferably 5 to 30 mol %, particularly 7 to /j mol %.

In the core/shell ratio of the silver halide grains of the present invention, the amount of silver in the core part is greater than that in the shell part, and in particular, the amount of silver in the far part is at least to mol % of the total silver amount of the grain, preferably at least 70 mol %. It is.

Preferred particles include the following particles.

1) The core and shell parts are each entwined in one layer, and the core part has an iodine content rate of iodine content! If the shell part is made of silver iodobromide with an iodine content of 6 mol% or more, the grain as a whole has an iodine content of 3 to iodine.
Consisting of mole percent silver iodobromide.

11) The central part is made of silver oxide, and on the outside there is a silver iodobromide layer with an iodide content of 3 mol% or less, and the outermost layer (shell) is a silver iodobromide layer with an iodine content of 46 mol% or more. Yes, the iodine content of the entire particle is 3~/Q mol% and 6
Ru.

As the photosensitive silver halide used in the present invention, not only silver iodobromide but also silver chloroiodobromide can be used.

The average particle size is preferably greater than or equal to 0,000 μm. The particle size distribution may be narrow or wide. The silver norogenide grains in the emulsion may have regular crystal shapes such as cubic or octahedral, or irregular crystal shapes such as spherical or plate-like.
It may have a crystalline form (gilar) or a composite form of these crystalline forms. It may also consist of a mixture of particles of various crystalline forms. Tabular grains having a particle diameter of one or more times the grain thickness are preferably used in the present invention.

Such tabular grains are described in U.S. Patent No. μ.

Hirohiro 3, No. 226, μ, ≠3≠, Cocoa, Tokukai Sho! It is described in detail in the specifications of r-/27 Octopus No. 1, etc.

The light-sensitive silver norogenide emulsion used in the present invention is described in "Chimi Ny Physique Photography" by Glafkides, P.
e et Physique Photo-graph
ique) J (Paul-Monte A/PaulMo
``Photographic Emulsion Chemistry'' by G.F.
-Graphic Emulsion Chemi
stry ) J (The Focal Press The F
Published by OcalPreSS, /ri JA), V.L.
Zelikman et al.
“Making and Coating” by Al)
Photographic Emulsion (Making a
ndCoating Photographic Em
ulsion) J (Focal Press The F
It can be prepared using the method described in, for example, published by Ocal Press, published by Hiroten.

That is, any of the acidic method, neutral method, ammonia method, etc. may be used, and the method for reacting the soluble silver salt with the soluble halogen salt may be a one-sided mixing method, a simultaneous mixing method, or a combination thereof. .

It is also possible to use a method of forming particles under an excess of gold and silver ions (so-called back mixing method).

As one type of simultaneous mixing method, a method in which the pAg in the liquid phase in which silver halide is produced can be kept constant, that is, a so-called Chondrald double jet method can also be used.

According to this method, a silver halide emulsion having a regular crystal shape and a nearly uniform grain size can be obtained.

Two or more types of silver halide emulsions formed separately may be mixed and used.

In the process of silver halide grain formation or physical ripening,
A cadmium salt, a zinc salt, a lead salt, a thallium salt, an iridium salt or a complex salt thereof, a rhodium salt or a complex salt thereof, an iron salt or an iron complex salt, etc. may be present.

For details of the multilayer structure halogenated grain emulsion preferably used in the present invention, many known documents can be referred to, for example, JP-A-7113/A.
No. 0, No. 40-/47uJJ, No. 0, No. 40-/47uJJ, No.
No. 3 can be mentioned.

Binders for the photographic layer include proteins such as gelatin and casein; cellulose compounds such as carboxymethyl cellulose and hydroxyethyl cellulose; sugar-containing conductors such as agar, sodium alginate, and starch derivatives; synthetic hydrophilic colloids such as polyvinyl alcohol and vinyl Pyrrolidone, polyacrylic acid copolymers, derivatives thereof, partial hydrolysates, etc. can also be used in combination.

Gelatin referred to herein refers to so-called lime-treated gelatin, acid-treated gelatin and enzyme-treated gelatin. As the gelatin, gelatin containing the polymeric component (1) described in JP-A-02-87952 is preferred.

Further, the photographic light-sensitive material of the present invention may contain an alkyl acrylate latex described in U.S. Pat. No. 3,411,911, U.S. Pat. I can do it.

Although the silver halide emulsion can be used as a so-called primitive emulsion without chemical sensitization, it is usually chemically sensitized. For chemical sensitization, the Glafkldes or Zal lkm+a
n et al.'s book or H, Fr! Die Gru
ndlagender I'hoLoHraphis
cben Prozesse sit Silb
arhalogeniden (＾kides+1sch
e VerlagsgesellscbafL 1
968) can be used.

That is, a sulfur sensitization method using a compound containing sulfur that can react with silver ions or active gelatin, a reduction sensitization method using a reducing substance, a noble metal sensitization method using gold or other noble metal compounds, etc. are used alone or in combination. be able to. As the sulfur sensitizer, other compounds such as thiosulfates, thioureas, thiazoles, rhodanines, etc. can be used, and specific examples thereof are described in U.S. Pat. No. 1.574.944, 2. No. 410.689, No. 2,278,947, 2.
No. 728.668 and No. 3,656.955. As the reduction sensitizer, stannous salts, amines, hydrazine derivatives, formamidine sulfinic acid, silane compounds, etc. can be used. For noble metal sensitization, in addition to kumquat salts, complex salts of metals in group I of the periodic table, such as platinum, iridium, and palladium, can be used.

The light-sensitive material of the present invention may contain various compounds as antifoggants or stabilizers.

Azoles such as benzothiazolium salts, nitroindazoles, triazoles, benzotriazoles, benzimidazoles (especially nitro- or halogen substituted); heterocyclic mercapto compounds such as mercaptothiazoles, mercaptobenzothiazoles, mercapto. Benzimidazoles, mercaptothiadiazoles, mercaptotetrazoles 11 (especially 1
-phenyl-5-mercaptotetrazole), mercaptopyridines; the above-mentioned heterocyclic mercapto compounds having a water-soluble group such as a carboxyl group or a sulfone group; thioketo compounds such as oxazolinthione; azaindenes such as tetraazaindenes; 4-Hydroxysubstituted (1,3,3a.

7) Many compounds known as antifoggants or stabilizers can be added, such as tetraazaindenes); benzenethiosulfonic acids, benzenesulfines, etc.

For more detailed examples of these and how to use them, see, for example, U.S. Pat. No. 3,954.474;
The descriptions in the specifications of No. 982.947 and No. 4.021.248 or Japanese Patent Publication No. 52-28゜660 can be referred to.

Hardening agents include mucochloric acid, formaldehyde, dimethylol urea, glyoxal, succinaldehyde,
Aldehyde compounds such as glutaraldehyde; divinyl sulfone, methylene bismaleimide, 5-7cetyl-1,3-diacryloyl-hexahydro-3-toIJacine, 1.3゜5-triacryloyl-hexahydro-
S-triazine, l, 3.5-1 ribinylsulfonyl-hexahydro-3-triazilebis(vinylsulfonylmethyl) ether, l 3-bis(vinylsulfonylmethyl)propano-2, bis(α-vinylsulfonylacetamide) Active vinyl compounds such as ethane; 2
, 4-dichloro-6-hydroxy-3-triazine sodium salt; N-carbamoylpyridinium salt M ((1-morpholinocarbonyl-
(3-pyridinio)methanesulfonate, etc.), haloamidinium salts M (1-(1-chloro-1-pyridinomethylene)pyrrolidinium, 2-naphthalenesulfonate, etc.), and inorganic compounds such as chrome light pan. .

The photographic emulsion layer or other constituent layers of the light-sensitive material of the present invention may contain various additives such as coating aids, antistatic properties, improving slipperiness, dispersing emulsions, preventing adhesion, and improving photographic properties (for example, accelerating development, increasing contrast, and sensitizing). For this purpose, surfactants other than those of the present invention may be included.

For example, saponins (steroids), alkylene oxide m4 bodies (e.g. polyethylene glycol, polyethylene glycol/polypropylene glycol condensates, polyethylene glycol alkyl ethers or polyethylene glycol alkyl aryl ethers, polyethylene glycol esters, polyalkylene glycol alkyl amines, nonionic surfactants such as polyamides, polyethylene oxide adducts of silicone), glycidol derivatives (e.g. alkenylsuccinic acid polyglycerides, alkylphenol polyglycerides), fatty acid esters of polyhydric alcohols, alkyl esters of sugars; alkyl Carboxylate, alkyl sulfonate, alkylbenzene sulfonate, alkylnaphthalene sulfonate, alkyl sulfate, alkyl phosphate [, N-acyl-N-alkyl taurate, sulfosuccinate, sulfoalkyl polyoxy] Anionic surfactants containing acidic groups such as carboxylic acid groups, sulfo groups, phosphor groups, sulfuric acid ester groups, and phosphoric acid ester groups, such as ethylene alkyl phenyl ethers and polyoxyethylene alkyl phosphate esters. ;Ampholytic surfactants such as amino acids, aminoalkyl sulfonic acids, aminoalkyl sulfates or phosphates, alkyl betaines, amine oxides; Alkylamine salts, aliphatic or aromatic quaternary ammonium salts, pyridinium, imidazolium Cationic surfactants such as heterocyclic quaternary ammonium salts such as phosphonium or sulfonium salts containing aliphatic or heterocycles can be used.

The photographic emulsion of the present invention may be spectrally distorted by methine dyes and others. The pigments used include cyanine pigments and merocyanine pigments. , monocyanine dyes, complex merocyanine dyes, holopolar cyanine dyes, hemicyanine dyes, styryl dyes, and hemioxonol dyes. Particularly useful dyes are cyanine dyes, merocyanine dyes, and dyes belonging to complex merocyanine dyes. Any of the nuclei commonly used for cyanine dyes can be used as the basic gR ring nucleus for these dyes.
Namely, pyrroline J, oxazoline nucleus, thiazoline nucleus, virol nucleus, oxazole nucleus, thiazole nucleus, selenazole nucleus, imidazole nucleus, tetrazole nucleus, pyridine nucleus, etc.; A nucleus in which an alicyclic hydrocarbon ring is fused to these nuclei; and a nucleus in which an aromatic hydrocarbon ring is fused to these nuclei,
That is, an indolenine nucleus, a benzindolenine nucleus, an indole nucleus, a benzoxazole nucleus, a naphthoxazole nucleus, a benzothiazole nucleus, a naphthothiazole nucleus, a benzoselenazole nucleus, a benzimidazole nucleus, a quinoline nucleus, etc. are applicable. These nuclei may be 11-negative on the carbon atom.

Merocyanine dyes or composite merocyanine dyes include a pyrazolin-5-one nucleus, a thiohydantoin nucleus, and a 2-thioxazolidine-2 nucleus having a ketomethylene structure.
, 4-dione nucleus, thiazolidine-2,4-dione nucleus, rhodanine nucleus, thiobarbyl nucleus, and the like can be applied.

(Examples) The present invention will be further explained below with reference to Examples and Comparative Examples, but the present invention is not limited to these Examples.

(Example-1) Example 1 (1) Preparation of silver halide emulsion (a) Preparation of tabular grains Aqueous solution-1 While maintaining the aqueous solution -/fJO0c and stirring vigorously, AgNO34, At was made into an aqueous solution, and KBrO
,λhiro? was added as an aqueous solution. Thereafter, while maintaining the temperature at 7j'C, AgNO3/4'ti-t was added as an aqueous solution for 60 minutes. (However, in that case, halogen solution -/(
(described in Table 1) and the potential t-pAg using KBr solution.
7. ? Keep it at a temperature of 9. After that, AgNO3/ri,
Ko2 as an aqueous solution/! KI was added as halogen solution-2 (listed in Table 1) and KBr solution was added to prepare an emulsion. The average projected area diameter and surface area ratio are listed in Table 1.

However, 8CN/7ff was added during the grain growth of the emulsion.

The emulsion was then precipitated in Jj'CVC to remove soluble salts, and then mixed with 1 x gelatin, phenol,
Add NaOH and KBr to disperse, pH-1, ≠, p
Adjusted to Ag=r, ≠. After raising the temperature to 57°C and adding sensitizing dyes 1 to 3, gold and sulfur sensitization was performed to prepare various emulsions.

(b) g Preparation of photosensitive silver halide emulsion A Potassium bromide, potassium iodide, and silver nitrate were added to an aqueous gelatin solution with vigorous stirring, and silver iodobromide (average iodo content r mol %) was prepared. Thereafter, it is washed with water by the usual precipitation method, sensitizing dyes 1 to 3 are added, and then chemical sensitization is carried out by the tomokin/sulfuric acid sensitization method using chloroauric acid and sodium thiosulfate to form a photosensitive silver iodobromide emulsion. I got someone.

Sensitizing Dye-l Sensitizing Dye-Co Sensitizing Dye-3 (2) Preparation of coating sample The emulsion coating surface was prepared in advance by JP-A-62-1//! A triacetate film produced by the manufacturing method described in No. 03j was subbed processed, and the back side was coated with 0+cH2CH20+rH (m+ n=Jλ) 10mg/m2 diacetyl cellulose /g3η/m2 silicon oxide.
Samples l~// were prepared by coating J/m2 and then simultaneously applying each layer of the following formulation sequentially from the support side onto the support.

(Bottom layer) Binder; Gelatin-/ 117 m2 Coating aid; Poly p-styrene sulfonic acid potassium salt io, o1 η/m2 (Binder N") (Middle layer) Binder; Gelatin-/ 0. μ?/m2 Coating aid ;Poly p-styrene sulfonic acid potassium salt 3.3~/FF12 (emulsion layer-
l) Amount of coated silver: Emulsion A 1.31/rr, 2 Binder: Gelatin - 22/m2f's Machining: C15HssOfCkhC1hOsa-z, r immediately/
Ag l f Coating aid: Poly p-styrene sulfonic acid potassium salt j OIn9/ 7F12 Hardener: /, λ-bis(vinylsulfonylacetamido)ethane 4tjIIJ9/
m2 (emulsion layer - λ) Coated silver gt: Emulsion (numbers are listed in the table) 1717 m2 Water bathing polymer: M is listed in the table Binder: Gelatin - J j, rr/m2115
71D Agent: CtaHasofcHzG(20) 2°H, 1~/Ag1F Trimethylolallopane 'IJ OMg/ @ 2 Fabric Auxiliary Agent: Bory p-styrene sulfonic acid potassium salt /701119/ff12 (surface protective layer) Gelatin -J O, r f/i2/
3T! 9/rIL2 C8F17SO2N CH2C00K / ,
I 1119/m23H7 Polybotacium p-vinylbenzenesulfonate 6/m2 Polymethyl methacrylate fine particles (average particle size 3 μm) 0. ismy7@z≠-hydroxy-6-methyl- /, j, 33.7-chitrazagelatin l≠O■/m2 Ultraviolet absorber 802N(C4H9)2 The compound X of the present invention can be dispersed by the following procedure. I made something and used it.

■Liquid■Liquid While stirring the ■liquid at 4to°C, add liquid 1 little by little.

(3) Sensitometry These samples were stored at a temperature and humidity of t-30°CtJ%R)I for 7 days after coating. Each sample was tested in the following manner.

(1) Measurement of sensitivity Each sample was exposed through an optical wedge to a μOO lux tungsten source for 7770 seconds, and then developed with the following developer at 10° C. for 7 days.

Using the same method for each fixed, washed, and dried sample, the photographic sensitivity was measured at a constant density (0° optical density) higher than the Kazuri density.90 These results are shown in Table 1 below.

Developer Metol Co? Sodium sulfite 1009 hydroquinone
j? Borax 10H2Q
2? add water
/Fixer: Fuji Fix (Fuji Photo Film Co., Ltd. (11)) Measurement of graininess Graininess was measured with a diameter of one ture using a Hiromu anno.
It was evaluated in terms of graininess (however, in terms of optical rIk degree). For information on rms graininess, see T. H. James' collection The Theory of the Photographic Process (The Theory of the Photographic Process).
ry of the Photographic
Process) (/ri77, -rTsukumiran (Mac
Millan) G/Ter, page 620.

The next sample was developed and processed in the same manner as in (1).

The gelatin used in this example is as follows.

Gelatin Proportion of high-volume components” (wt%)/
/! , % 2 μ, 1% 3 /3.2% As can be seen from Table 1, the sample with the structure of the present invention has granularity. Good and sensitive.

Patent Applicant: Fuji Photo Film Co., Ltd. Procedural Amendment

Claims (1)

[Scope of Claims] A silver halide photographic light-sensitive material having at least one silver halide photographic emulsion layer on at least one side of a support, in which the emulsion layer contains emulsion grains with a higher iodine content toward the outside. A silver halide photographic light-sensitive material characterized by containing a polymer containing a repeating unit represented by the following general formula (I) and/or dextran. General formula (I) ▲Mathematical formulas, chemical formulas, tables, etc. 10
represents a substituted or unsubstituted alkyl group, aryl group or aralkyl group, which may be the same or different. Furthermore, R^2 and R^3 may be bonded to each other to form a nitrogen-containing heterocycle together with a nitrogen atom. L is an m+1-valent linking group. n is 0 or 1, and m is 1 or 2. )