JPH0196643A - Silver halide photographic sensitive material with excellent sharpness - Google Patents

Abstract

PURPOSE:To improve the sharpness of the photographic sensitive material by specifying the center line average height on the surface of a supporting body to be coated with a hydrophilic colloidal layer, and the thickness of the hydrophilic colloidal layer. CONSTITUTION:The hydrophilic colloidal layer contg. a substance having absorbing property in a wavelength region having photosensitive property is provided between a photographic emulsion layer and the supporting body. The center line average height (Ra) on the surface of the supporting body to be coated with the hydrophilic colloidal layer thereon, is 0.3-1.5mum, and the thickness of the hydrophilic colloidal layer is larger than 0.5 times of the center line average height (Ra) on the surface of the supporting body. The substance having the absorbing property in the wavelength region having the photosensitive property, is incorporated in the hydrophilic colloidal layer provided between the photographic emulsion layer and the supporting body, and is exemplified by a dyestuff, a pigment or a colloidal silver, etc. Thus, the sharpness of the material is improved in the photosensitive material which is subjected to a mat finishing on the surface of the supporting body.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a silver halide photographic material, and particularly to a silver halide photographic material having excellent sharpness.

[Conventional technology]

For silver halide photographic materials that record optical information,
Spatially faithful reproduction of optical information is an extremely important performance.

Light incident on the surface of a photosensitive material travels through the photosensitive material without being spatially spread out due to various factors, and this spread hinders faithful reproduction of optical information. Factors that spread light include (1) scattering on the surface of the photosensitive material, at the interface between photographic layers, or at the interface between the photographic layer and the support, (2) silver halide grains and matting agent particles contained in the photographic layer, etc. scattering by solid particles, oil droplets, etc., and (3) scattering within the support.

In recent years, as a support for silver halide photographic light-sensitive materials, supports having a paper base and both sides coated with a resin such as polyolefin have come to be used because of the advantage of rapid processing. Usually, tita dioxide M white pigment is dispersed in the resin on the side where the emulsion layer is coated, but the content of these white pigments such as titanium dioxide dispersed in the resin depends on factors such as dispersion stability. There is a limit due to constraints, and in the case of titanium dioxide, the upper limit is usually around 15% by weight, but at this level of content, the covering power is insufficient, and a portion of the light incident on the photosensitive material is absorbed by the resin layer. and diffuses into the paper substrate. A portion of the light diffused into the paper base passes through the resin layer again and returns to the photographic layer, exposing the silver halide grains, resulting in blurring or blurring of the image and reducing sharpness. This will cause significant deterioration.

In order to prevent such light diffusion in the paper substrate, a hydrophilic colloid layer containing, for example, a dye or colloidal silver is provided between the photographic emulsion layer and the support to prevent light passing through the photographic emulsion layer. Techniques are known for absorbing and reducing the absolute amount of light reaching the paper substrate. A hydrophilic colloid layer provided between a photographic emulsion layer and a support for this purpose is generally called an antihalation layer, and is described, for example, in Research Disclosure, Vol. 175, 1ten, 1755.
9 (November 1978) pp. 53-54 or Research Disclosure Vol. 187 1ten 18716
(November 1979), pages 649-650.

On the other hand, in the case of phototypesetting paper such as computerized typesetting paper, the processed paper is often used as a manuscript for plate-making cameras, but if the surface is too glossy, the image quality may deteriorate due to so-called flare light. Because of this, the surface of photosensitive materials is usually matte-finished. As methods for matting, there are two known methods: matting the surface of the support and adding a matting agent to the top layer of the photosensitive material. However, if the latter method alone reduces gloss, the photographic density will decrease. Because of this, a matte-finished support is usually used. In the case of photographic paper for phototypesetting, supports made of paper as a base and coated with resin such as polyolefin on both sides are widely used from the viewpoint of rapid processing. In order to minimize the decline in photographic density,
The matte degree of the surface of the support is usually determined by the center line average roughness Ra of 0.
It is adjusted to fall within the range of 3 to 1.5 μm. Here, the center line average roughness Ra is a value defined by JISBO601.

By the way, if you use a support with a matte surface,
There has been a problem in that the light that has passed through the photographic emulsion layer is diffusely reflected on the surface of the support, resulting in a significant deterioration in sharpness. The method of providing an antihalation layer between the support and the emulsion layer described above is expected to be effective even for photographic paper using a matte-treated support, but in any manner there is no way to improve sharpness more effectively. Until now, it was unknown whether it could be improved.

[Purpose of the invention]

An object of the present invention is to provide a photosensitive material using a support made of paper as a base and coated with resin on both sides, which is matted so that the surface of the support has a certain surface roughness, and which is sharp and sharp. An object of the present invention is to provide a silver halide photographic material with excellent properties.

[Structure of the invention]

The above-mentioned object of the present invention is to provide a silver halide photographic light-sensitive material in which a photographic emulsion layer is provided on a paper-based support whose both sides are coated with a resin, in which between the photographic emulsion layer and the support,
A hydrophilic colloid layer containing a substance that absorbs in the wavelength range to which the photographic emulsion layer is photosensitive is provided, and the center line average roughness Ra of the support surface on the side to which the hydrophilic colloid layer is coated is 0.3 to 1.5 μm, and the thickness of the hydrophilic colloid layer is equal to the center line average roughness Ra of the surface of the support.
This is achieved by using a silver halide photographic light-sensitive material that is characterized by having a particle size greater than 0.5 times.

In the present invention, a substance contained in a hydrophilic colloid layer provided between a photographic emulsion layer and a support and having an absorption in a wavelength range to which the photographic emulsion layer is sensitive (hereinafter referred to as "substance according to the present invention" as appropriate), etc. ) specifically refers to dyes, pigments,
Contains colloidal silver, etc. Among these, dyes, especially dyes having acid groups, are particularly desirable for photographic paper, such as computerized typesetting photographic paper, which requires a short processing time and does not include a desilvering step as a processing step, since it provides a high degree of whiteness.

Examples of dyes that can be used as substances according to the present invention include cyanine dyes, hemicyanine dyes, streptocyanine dyes, merocyanine dyes, oxonol dyes, hemioxonol dyes, styryl dyes, rhodacyanine dyes, neocyanine dyes, and azo dyes. , anthraquinone dyes, etc.

Among these dyes, dyes having at least one acid group such as a sulfo group or a carboxyl group are preferred because they leave little residual color after treatment.

Examples of dyes used in the present invention include ultraviolet absorbing dyes, yellow dyes, red dyes, blue dyes, and near-infrared absorbing dyes, and specific examples thereof are shown below, which can be used in the present invention. It goes without saying that the substances are not limited to these specific compounds.

(Ultraviolet absorbing dye) (I-1) 0 CH.

(Yellow dye) 0Ja S03 with 5O3Na (If 9) Ctli CH3o3K (Red dye) (I[[-1) (III-2) So, K SO,K (III-8) (Blue dye) (IV -1) (IV-2) CI, So, H (IV-5) (TV-6) (IV-9) (Near-infrared absorbing dye) (V-2) (V-3) Na0aS (CI(t) z (CHt)zsOJ
aHsCz (CHz)asOJ Any dye or other substance used in the present invention can be freely selected as long as it has absorption in the wavelength range to which the photographic emulsion layer is sensitive. The amount of dye etc. to be added is preferably such that the reflection density of the photographic emulsion layer at the wavelength of maximum sensitivity is 0.1 or more, more preferably 0.3.
The amount is as follows.

The thickness of the hydrophilic colloid layer containing the substance according to the present invention needs to be larger than 0.5 times the center line average roughness Ra of the support surface, and more preferably larger than Ra. If the thickness is less than 0.5 times, the sharpness will be poor even if the applied amount of the substance according to the present invention, such as dye, is the same.

Further, if the thickness is too thick, there are problems such as poor drying properties during development processing, so it is desirable that the thickness does not exceed 2 μm.

As the hydrophilic colloid constituting the hydrophilic colloid layer, it is advantageous to use gelatin, but gelatin derivatives, graft polymers of gelatin and other polymers, other proteins, sugar derivatives, cellulose derivatives, monomers, etc. Alternatively, hydrophilic colloids such as synthetic hydrophilic polymeric substances such as copolymers can also be used.

In addition, a plasticizer can be added to the hydrophilic colloid layer for the purpose of increasing flexibility, and a dispersion (latex) of a water-insoluble or poorly soluble synthetic polymer can be added to improve dimensional stability. can be done.

The hydrophilic colloid layer can be hardened by using one or more hardening agents that crosslink binder (or protective colloid) molecules and increase film strength.

The photographic emulsion layer in the silver halide photographic light-sensitive material of the present invention contains a photosensitive silver halide emulsion.

In carrying out the present invention, the silver halide emulsion for constituting the photographic emulsion layer includes silver bromide, silver iodobromide, silver iodochloride, silver chlorobromide, silver chloroiodobromide, and silver halide. Any material used in conventional silver halide emulsions, such as silver chloride, can be used.

The silver halide grains used in the silver halide emulsion may be obtained by any of the acid method, neutral method, and ammonia method. The grains may be grown all at once or after forming seed grains. You can let it grow. The method of creating and growing the seed particles may be the same or different.

In the silver halide emulsion, halide ions and silver ions may be mixed simultaneously, or one may be mixed in a liquid in which the other is present. Further, while taking into account the critical growth rate of silver halide crystals, halide ions and silver ions may be generated by sequentially and simultaneously adding them while controlling p)I and pAg in the mixing tank. By this method, silver halide grains having a regular crystal shape and a nearly uniform grain size can be obtained. After growth, a conversion method may be used to change the halogen composition of the particles.

When producing a silver halide emulsion, a silver halide solvent can be used as necessary to control the grain size, grain shape, grain size distribution, and grain growth rate of silver halide grains.

The silver halide grains used in silver halide emulsions are formed with cadmium salts, zinc salts, lead salts, thallium salts, iridium salts (
Adding metal ions using at least one selected from rhodium salts (complex salts containing), rhodium salts (complex salts containing), and iron salts (complex salts containing), and containing these metal elements inside the particles and/or on the particle surfaces. By placing the particles in an appropriate reducing atmosphere, reduction sensitizing nuclei can be provided inside the particles and/or on the particle surfaces.

Unnecessary soluble salts may be removed from the silver halide emulsion after the growth of silver halide grains is completed, or they may be left contained. When removing the salts, Research Disclosure (Research Disclosure) is required.
Closure) It can be carried out based on the method described in No. 17643.

The silver halide grains used may have a uniform silver halide composition distribution within the grain, or may be core/shell grains in which the silver halide composition differs between the inside of the grain and the surface layer.

The silver halide grains used may be such that the latent image is mainly formed on the surface, or may be such that the latent image is mainly formed inside the grain.

The silver halide grains used may have a regular crystal shape such as a cube, octahedron, or dodecahedron, or may have an irregular crystal shape such as a spherical shape or a plate shape.

In these particles, any ratio of the (100) plane to the (111) plane can be used. In addition, the particles may have a composite form of these crystal forms (or particles of various crystal forms may be mixed).

The average grain size of the silver halide grains (grain size represents the diameter of a circle with an area equal to the projected area) is preferably 2 μm or less, and particularly preferably 1 μm or less.

Silver halide emulsions having any grain size distribution may be used. An emulsion with a wide grain size distribution (referred to as a polydisperse emulsion) may be used, or an emulsion with a narrow grain size distribution (referred to as a monodisperse emulsion). When divided by the average grain size, the value is 0.20 or less, where the grain size is the diameter in the case of spherical silver halide, and the projection in the case of grains with a shape other than spherical. ) may be used alone or in combination. Further, a mixture of a polydisperse emulsion and a monodisperse emulsion may be used.

The silver halide emulsion may be a mixture of two or more separately formed silver halide emulsions.

- Various additives may be used in the photographic emulsion layer, hydrophilic colloid layer, or other constituent elements of the light-sensitive material of the present invention, depending on the purpose.

These additives are described in more detail in Research Disclosure Vol. 176 I tem 17643 (1
December 1878) and 187@I ten 1871
6 (November 1979), and the relevant parts are summarized in the table below.

Furthermore, there are no particular limitations regarding the exposure and development processing conditions for the photosensitive material of the present invention, and for example, the description in the aforementioned Research Disclosure Vol. 176, pages 28-30 may be referred to.

1. Chemical sensitizers page 23, page 648, right column 2, sensitivity increasing agents, same as above 4, brighteners, page 24, 8, dye image stabilization, page 25, agent 9, hardeners, page 26, page 651, left column 10,
Binder page 26 Same as above 11, plasticizer, lubricant page 27 page 650 right column additive type RD 17643 RD 1g716
12, fj! Fabrication aids, Table, pages 26-27 Same as above Surface activator First, the support used in the silver halide photographic material of the present invention will be described. In the present invention, a support having a paper base and a screen coated with resin is used.

The resin used to coat the paper substrate is preferably a polyolefin resin. As the polyolefin resin, homopolymers such as low-density polyethylene, high-density polyethylene, polypropylene, polybutyne, and polypentene, copolymers of two or more olefins such as ethylene-propylene copolymers, and mixtures thereof can be used. and various densities and melt viscosity indexes (
Melt index (hereinafter simply abbreviated as MI) can be used alone or in combination.

The resin layer covering the paper substrate, for example, the resin layer made of the above-mentioned polyolefin resin, preferably contains white pigments such as titanium oxide, zinc oxide, talc, and calcium carbonate. Fatty acid amides such as araxinamide, fatty acid metal salts such as zinc stearate, calcium stearate, magnesium stearate, calcium palmitate, pigments and dyes such as ultramarine blue and cobalt violet, antioxidants, optical brighteners, ultraviolet absorbers It is preferable to add various additives such as in appropriate combinations. In particular, the amount of titanium oxide added to the resin layer of the resin-coated paper support on which the photographic emulsion layer is coated is preferably in the range of 5% to 20% by weight based on the resin layer. . In addition, when adding ultramarine blue to the resin layer in combination with a white pigment such as titanium oxide, the amount used is 0.01% by weight to 1.0% by weight based on the resin layer.
A range of % by weight is preferred, especially 0.04% by weight to 0.
．． A range of 5% by weight is preferred.

The support used in the present invention can be produced, for example, by melt-extruding a resin composition containing a heated and melted titanium dioxide pigment onto a paper base that is normally run, and applying the resin composition in the form of a film through a slit die. Melt extrusion temperature is 200℃ to 350℃
Preferably it is ℃.

Furthermore, before coating the resin composition on the paper base, it is preferable to subject the paper base to an activation treatment such as corona discharge treatment or flame treatment. There is no particular restriction on the thickness of the resin layer of the resin-coated paper. However, extrusion coating to a thickness of about 5 to 50 microns is generally advantageous.

In the present invention, the centerline average roughness Ra of the surface of the support on the side to which the hydrophilic colloid layer is coated (therefore, the side to which the emulsion layer is coated) is in the range of 0.3 to 1.5 μm. It is necessary that the
It is in the μm range. If Ra is less than 0.3 μm, flare light will be a problem when photographing the processed photosensitive material as a manuscript with a plate-making camera, and if it exceeds 1.5 μm, the reflection density will decrease significantly and sharpness will deteriorate. It's also intense.

The surface of the support on which the hydrophilic colloid layer is applied is
Depending on the use, any patterning such as a matte surface or a silky surface can be used as a surface, but in that case, regardless of the surface patterning, the roughness must be within the above range.

That is, in general resin-coated paper in which both sides of the paper base are coated with resin, the resin surface containing titanium dioxide pigment can be matte, silky, etc., depending on the application, or vice versa. The back of the side is usually a matte surface,
The front surface or both the front and back surfaces can be subjected to activation treatment such as corona discharge treatment or flame treatment if necessary.

The paper substrate used in the practice of the present invention is arbitrary and may be either ordinary natural pulp paper or synthetic paper, but natural pulp paper whose main component is wood pulp such as softwood pulp, hardwood pulp, or mixed softwood pulp is suitable. Used to advantage. Also, there are no particular restrictions on the thickness of the paper base, but
A paper base with good surface smoothness is preferred, and its basis weight is 50
g/% to 250 g/bo is preferable.

The paper substrate mainly composed of natural pulp, which is advantageously used in carrying out the present invention, can contain various polymeric compounds and additives. For example, dry paper strength enhancers include cationized starch, cationized polyacrylamide, anionized polyacrylamide, carboxy-modified polyvinyl alcohol, gelatin, etc. Sizing agents include fatty acid salts, rosin derivatives, dialkyl ketene dimer emulsions,
Petroleum resin emulsion, ammonium salt of styrene-maleic anhydride copolymer alkyl ester, pigments such as clay, kaolin, calcium carbonate, barium sulfate, titanium oxide, etc. Wet paper strength agents such as melamine resin, urea resin, epoxy polyamide resin, fixing agents such as polyvalent metal salts such as aluminum sulfate and aluminum chloride, cationic modified polymers such as cationized starch, pH moderators such as caustic soda, soda carbonate, and hydrochloric acid, and inorganic electrolytes such as salt, Other dyes such as Glauber's salt, optical brighteners, latex, etc. can be contained in appropriate combinations.

〔Example〕

Examples of the present invention will be described below. It should be noted that, as a matter of course, the present invention is not limited to the following examples.

Example 1 In this example, a coating solution for an antihalation layer (corresponding to a hydrophilic colloid layer provided between a photographic emulsion layer and a support according to the present invention) and an emulsion layer were prepared as follows. A coating solution was prepared.

(Preparation of coating solution for antihalation layer) Add the above exemplary dye (V-1) or (V-4) to an aqueous gelatin solution.
1, and added 2-sulfonate bis(2-ethylhexyl) succinate as a coating aid.
A coating solution for an antihalation layer was prepared by adding the ester sodium salt and a styrene-maleic anhydride copolymer as a thickener. The amount of gelatin added was varied so that the thickness of the antihalation layer was as shown in Table 1. Here, the thickness of the antihalation layer was determined by photographing the cross section of the sample after coating using a scanning electron microscope.

(Preparation of coating solution for emulsion layer) Solution A Solution B Solution C In the above solution A kept at 40°C, adjust the pH to 3°pAg.
The above solution B and solution C were simultaneously added functionally over 80 minutes while maintaining the pH at 7.7, and after continued stirring for an additional 5 minutes, the pH was adjusted to 5.6 with an aqueous sodium carbonate solution,
After normal desalting and water washing steps, 500 g of water and 30 g of gelatin are added and dispersed at 50° C. for 30 minutes. As a result, cubic grains containing 35 mol % of silver bromide, 65 mol % of silver chloride, and an average grain size of 0.27 μm are obtained.

A 1% aqueous solution of citric acid was added to 10-1 and a 5% aqueous solution of sodium chloride was added to adjust the pH to 5.5. To the emulsion whose pAg was adjusted to 7, 10rn1 of a 0.1% sodium thiosulfate aqueous solution and 7d of a 0.2% chloroauric acid aqueous solution were added and ripened at 57°C to obtain the highest sensitivity.

Subsequently, 0.1% methanol solutions of the following infrared sensitizing dyes (a) and (b) were added at 25% each per mole of silver halide.
- plus 0.5% solution of 1-phenyl-5-mercaptotetrazole as an anti-capri agent and 4-hydroxy-6-methyl-1,3,3a as a 25-1 stabilizer;
A 1% solution of 7-chitrazaindene 180-1 and 300 ml of a 10% gelatin aqueous solution were added to stop the ripening. As a coating aid, a 10% aqueous solution of tri-iso-propylnaphthalene sulfonic acid potassium salt was added to the 15-
1 50ml of 4% aqueous solution of styrene-maleic acid polymer as a thickener and 30g of butyl acrylate polymer latex were added and stirred, and tetrakis (as a hardening agent) was added.
1:0.25 mol reaction product of (vinylsulfonylmethyl)methane and taurine potassium salt per 1 g of gelatin.
A coating solution for an emulsion layer was prepared by adding 0.0 cm and adjusting the pH to 5.6 with citric acid.

Sensitizing dye (b) (Preparation of coating solution for protective layer) Add 2-sulfonate succinic acid bis(2-ethylhexyl) ester sodium salt as a coating aid to an aqueous gelatin solution at 30μ/nf and as a matting agent in an average particle size. Diameter 4μm
of polymethyl methacrylate at 40 μ/rd, the following compound (c) as a fluorine-containing surfactant at 30 μ/d,
A coating solution for a protective layer was prepared by adding formalin as a hardening agent in an amount of 10 μm per gram of gelatin.

Fluorine-containing surfactant (C) Using each coating solution prepared as described above, samples were prepared as follows. That is, the antihalation layer coating solution, the emulsion layer coating solution, and the protective layer coating solution have a hydrophilic colloid backing layer and an undercoat layer, and TiO2 is 1.
Three layers were simultaneously coated on a 110 μm thick polyethylene coated paper containing 5 wt%.

The centerline average roughness Ra of the surface of the polyethylene coat used was as shown in Table-1.

In this case, Ra is Perth manufactured by Perthen, West Germany.
It was measured using an ometer S5P model. The coating amount of the obtained sample was 1.4 g/rd, the gelatin coating amount was 1.4 g/rd for the emulsion layer, and 0.9 g/m for the protective layer.

After irradiating the sample thus obtained with a semiconductor laser beam with a wavelength of 780 nm while performing raster scanning, the sample was exposed to the Sakura Automatic Processor GR-14 (manufactured by Konishiroku Photo Industry Co., Ltd.) as an automatic developer, and the sample was exposed as a developer. -2, Development processing was carried out using a processing solution having the formulation shown in Table 3 as a fixing solution. The processing conditions are: development is at 38°C.
20 seconds, fixing at about 38℃ for 20 seconds, washing with water at room temperature for 20 seconds,
The drying temperature was about 40°C.

Sharpness was evaluated using a 100x magnifying glass to perform a five-level relative evaluation of straight edge cuts with a width of about 100 μm in the processed sample. Here, evaluation 5 is the best, and evaluation 1 is the worst.

The results obtained are shown in Table-1.

As is clear from Table 1, the straight edge portions of sample intervals 2 to 4 and -6 to 8 of the present invention have good sharpness.
1 Table 2 Developing Solution Prescription Table 3 Fixing Solution Prescription Example 2 In this example, various coating solutions were prepared as follows.

(Preparation of coating solution for antihalation layer) A coating solution was prepared in the same manner as in Example 1 except that (mV-1) or (rV-4) was used as the dye.

The thickness of the antihalation layer is as shown in Table 4.

(Preparation of coating solution for emulsion layer) Silver halide composition: silver bromide 90 mol%, silver chloride 9 mol%
, consisting of 1 mol% silver iodide, with an average grain size of 0.6μ
A tetradecahedral silver halide emulsion of m was prepared by an ammonia method, and then gold sensitized and sulfur sensitized. In this emulsion, the following formula (d) is used as a sensitizing dye per mole of silver halide.
200 mg of compound, 4-hydroxy-6 as stabilizer
-Methyl-L3.3a.

7-Chitrazaindene as 1g1 anti-capri agent 1-
60 mg of phenyl-5-mercaptotetrazole, 1 g of sodium triisopropylnaphthalene sulfonate as a coating aid, 60 g of polyethyl acrylatelatefx and 2 diethylene glycol as film property improvers.
An emulsified dispersion of a fluorescent brightener (e) prepared by the method shown below was added, and a styrene-maleic anhydride copolymer was added as a thickener, and tetrakis(vinylsulfonyl) was added as a hardener. A 1:0.25 mol reaction product of methyl) methane and taurine potassium salt was added per gram of gelatin (
Preparation of fluorescent brightener emulsion) 0.8 g of the above oil-soluble fluorescent brightener (e) was mixed with talesyl diphenyl phosphate 25- and 1-butanol 12-
A 5% gelatin aqueous solution containing 0.5 g of triisopropylnaphthalene sulfonic acid sodium salt dissolved in 26
0 mZ and dispersed by ultrasonic dispersion to prepare an emulsified dispersion.

(Preparation of coating solution for protective layer) Add a capping agent with an average particle size of 4 μm to an aqueous gelatin solution.
of polymethyl methacrylate at 40+sg/rrr,
6IIIg/d of 2-sulfonate succinic acid bis(2-ethylhexyl) ester sodium salt as a coating aid.
1. The following compound (, f) was used as a fluorine-containing surfactant.
mg/d, Exemplary Compound (III-
A coating solution for a protective layer was prepared by adding 100 mg/rrr of 1), 28 n+g of formalin per 1 g of gelatin as a hardening agent, and 1 mg/d of 1-phenyl-5-mercaptotetrazole as an antifoggant. .

Na0sS COC00CHz+CFt)aH Coating liquid for antihalation layer thus prepared,
The coating solution for the emulsion layer and the coating solution for the protective layer were simultaneously coated 3N onto a 110 μm thick polyethylene coated paper having a hydrophilic colloid backing layer and containing 15 wt % TiOz. Center line average roughness Ra of polyethylene coated surface
is as shown in Table-4. The amount of coated silver in the obtained sample was 1.4 g/n? , the gelatin coating amount is 1.6 in the emulsion layer.
g/rd, and the protective layer was 1.5 g/m.

The sample thus obtained was irradiated with helium-neon laser light while performing raster scanning, and then developed in the same manner as in Example 1. Cut the edge of the straight line by 10
A 5-level relative evaluation was performed in the same manner as above using a 0x looper.

The results obtained are shown in Table 4.

As is clear from Table 4, samples 11h22~ of the present invention
24 and 26 to 28 have sharp straight edges,
Excellent sharpness.

Table-4 Example-3 In this example, various coating liquids and the like were prepared as follows.

(Preparation of coating solution for antihalation layer) A coating solution was prepared in the same manner as in Example 1 except that (n-1) or (If-6) was used as the dye.

The thickness of the antihalation layer is as shown in Table 5.

(Preparation of coating solution for emulsion layer) A compound of the following formula (g) was added as a sensitizing dye to silver halide 1
It was prepared in the same manner as in Example-2 except that 120 mg per mole was added.

(Preparation of coating solution for protective layer) Exemplified compound (IV-1) was added as a filter dye to 121
It was prepared in the same manner as in Example-2 except that ag10f was added.

Each of the coating liquids thus prepared was applied onto polyethylene coated paper in the same manner as in Example-2.

The center line average roughness Ra of the polyethylene coated surface is shown in Table-
5, and the amount of coated silver was 1.4 g/r+f.

The amount of gelatin applied is 1.6 g/rd for the emulsion layer and 1.5 g/rr for the protective layer. Met.

The sample obtained in this way was subjected to a spatial frequency of 11ine
The film was brought into close contact with a CFT evaluation mask prepared by vapor-depositing the Inconel alloy on a glass plate so as to change stepwise from /min to 501 in/min, and exposed for 10-b seconds using a xenon light source. Thereafter, development was performed in the same manner as in Example-1, and the processed sample was measured using a Sakura Microdensitometer PDM-5 (manufactured by Konishiroku Photo Industry Co., Ltd.) to evaluate CFT.

Here, CFT stands for Contrast Transfer.
It is an abbreviation for r-Function, and while MFT uses a sine wave, CFT uses a rectangular wave, and they can be converted into each other. The maximum CFT is 1.0, which is the state with the best sharpness when other conditions are constant.

Table 5 shows the CFT evaluation results.

Here, the spatial frequency is 151ine/min and 30
The value at 1ine/min is shown.

As is clear from Table 5, sample fish 32 to 34 of the present invention
and Magnetics 36 to 38 have high CFT values and excellent sharpness. We were able to provide photographic materials.

Patent applicant Konishiroku Photo Industry Co., Ltd. Representative Patent Attorney Toru Tsuki Taka

Claims (1)

[Claims] 1. In a silver halide photographic light-sensitive material in which a photographic emulsion layer is provided on a paper-based support whose both sides are coated with resin, the photographic emulsion layer has a photosensitive property between the photographic emulsion layer and the support. A hydrophilic colloid layer containing a substance that absorbs in a wavelength region of
1.5 μm, and the thickness of the hydrophilic colloid layer is greater than 0.5 times the centerline average roughness Ra of the surface of the support.