JPH06102620A - Manufacture of board for photography - Google Patents

Abstract

PURPOSE:To provide a manufacture of a board for photography showing a few dispersion of a hue, not showing a streak, a microgrid or a bleeding-out phenomenon and showing improved whiteness. CONSTITUTION:An under coating fluid containing substantially water insoluble dyestuff at a supported state on silica particles of colloidal silica is applied on a resin coated paper. Thus, board for photography not generating rip fouling too much, showing few dispersion of the hue, not showing streak, microgrid or the bleeding-out phenomenon and showing improved whiteness can be manufactured.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention relates to a method for producing a photographic support. More specifically, the present invention relates to a method for producing a resin-coated paper-type photographic support containing a titanium oxide pigment in the resin layer on the side where an image is formed and improving the whiteness of appearance with a coloring dye or pigment.

In recent years, a resin-coated paper type photographic support in which both surfaces of a paper are coated with a resin, particularly a polyolefin resin, has been widely used as a support for photographic materials. The resin layer on the side on which the image is formed contains a titanium oxide pigment in a high concentration in view of image sharpness and other requirements mainly in photographic performance. Since the titanium oxide pigment has a yellowish tint, the whiteness of the white background portion of the photographic image becomes insufficient as it is.

In particular, in the case of color photographic papers widely used in recent years, since it is required that the color reproduction is faithful and the colors are vivid, the support thereof is a clear white without coloring. Is required. In addition, the titanium oxide concentration in the resin layer tends to increase more and more due to the progress of technologies such as titanium oxide and resin, and the technology for improving the visual whiteness becomes more important. .

[0004]

2. Description of the Prior Art U.S. Pat. No. 3,501,298
In addition to titanium oxide pigment, the resin layer contains bluish pigments such as ultramarine blue, cobalt blue, and red pigments such as cobalt oxide phosphate (Raspberry V-6260 manufactured by Ferro Colors Corp) and quinacridone red. OB (Ci
ba Geigy product) is disclosed. JP-A-53-19021 discloses a bluish pigment, ultramarine blue, and a reddish pigment, Daiichi Pink DP-.
1, it is disclosed that the resin layer contains a cosmetic ultramarine called Daiichi Violet DV-1 (all manufactured by Daiichi Kasei).

JP-A-58-93050 and JP-A-63-
237056 discloses that an organic blue pigment having a specific structure is contained in a resin layer.

However, each of these techniques has its own problems and problems common to all of them. The common problem with these technologies is that since high-viscosity resins contain coloring pigments, it is difficult to evenly disperse those pigments, and it is not possible to strictly control the hue, so that the same lot can be used. That is, there are variations in hue.

The individual problems are as follows. Inorganic pigments generally tend to contain water. Cobalt blue has a relatively low water content, but its coloring power is low, so the amount used is large for sufficient color correction, and the water content in the resin composition eventually increases. Further, when redness correction is required, redness correction is usually performed lighter than bluish correction, but makeup blue or cobalt oxide phosphate has a very small tinting strength, and therefore a large amount of water is brought into the resin composition. .

As described above, when the water content in the resin composition is high, cracking of the resin film is likely to occur due to the blowing of steam during hot melt extrusion coating. In addition, the deterioration of the resin composition is deposited and deposited on the die lip opening of the extrusion coater, which promotes the tendency of icicle-like growth. (The dirt that adheres to and grows on such lip openings is referred to as die lip dirt below.) When this die lip dirt is generated, streak-like scratches are generated on the resin film, significantly deteriorating the value of the product, and finally there is nothing. It's worth it.

In order to remove the stains on the die lip that have once occurred, there is no choice but to suspend the production and clean the die lip, and a defect-free photograph in which an inorganic coloring pigment is used in the resin layer to improve the visual whiteness. Obtaining materials or photographic supports is very difficult.

On the other hand, many organic pigments have insufficient heat resistance and are not suitable for hot melt extrusion coating. Heat-resistant organic pigments, such as quinacridone red mentioned as a prior art example, have a strong primary particle and secondary particle, so that the pigment tends to appear as foreign matter or particles on the resin surface called microgrit. Easy to invite. When this microgrit is generated, the value as a photographic support or photographic material is completely lost.

Further, the optical brightener Uvitex OB has a tendency to bleed out from the resin, which not only has a problem in stability of color tone but also has a problem in adhesion between the support and the photographic emulsion layer.

It is also possible to add a dye to the undercoat layer to adjust the color tone. In this case, if the dye is water-soluble, it is dissolved and diffused during coating of a photographic constituent layer such as a silver halide emulsion to form an image. Undesirable coloration may occur in the blackened portion, or it may be eluted during processing such as development and the purpose of color tone adjustment cannot be achieved. On the other hand, when the dye is an organic solvent-soluble dye, agglomeration occurs when it is added to the hydrophilic colloid solution, and a uniform color tone cannot be obtained.

Further, a pigment or JP-A-2-1838
No. 2-1839, 2-259952, 2-
264247, 3-200248, 4-116.
In order to use a dye in the form of a solid at room temperature as described in No. 640, fine pulverization and fine dispersion are required. For that purpose, the known method uses an interface for stabilizing dispersion. Activators or protective colloids are needed. On the other hand, if the subbing layer contains an excessive amount of a surfactant, it will prevent uniform coating in the subsequent coating of photographic constituent layers such as emulsion layers. Further, a protective colloid having a concentration sufficient to stabilize the dispersion causes the thickness of the undercoat layer to be excessively large, which deteriorates the sharpness of the image.

[0014]

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to obtain a method for producing a photographic support having less hue variation and free of streaks, microgrit, or bleed-out phenomenon and having improved whiteness. is there.

[0015]

SUMMARY OF THE INVENTION An object of the present invention is to produce a photographic support in which an undercoat layer made of a hydrophilic colloid is coated on at least one surface of a resin-coated paper in which both surfaces of a paper substrate are coated with a polyolefin resin. A photographic support comprising the step of applying a subbing solution containing a substantially water-insoluble dye in the form of supporting silica particles of colloidal silica to a resin-coated paper and drying the method. It is achieved by the manufacturing method of.

The substantially water-insoluble dye used in the present invention is the maximum concentration that can be dissolved in a water single solvent in which nothing is adjusted except the hydrogen ion concentration, and the optical density (1 cm) of the dominant absorption wavelength is 0. It is a dye of 0.01 or less and can be used by appropriately selecting the type and amount in order to obtain a desired hue.

If the solubility in water is too high, the photographic emulsion layer is diffused when it is coated, and the black color tone of the final silver image is disturbed. It will not be possible to achieve the desired whiteness with a well-balanced hue.

Specific examples of the substantially water-insoluble dye used in the present invention include C.I. I. Vat Violet 1, C.I. I. Vat Violet 2, C.I. I. Vat
Violet 9, C.I. I. Vat Violet 1
3, C.I. I. Vat Violet 21, C.I. I. Va
t blue 1, C.I. I. Vat Blue 3, C.I. I. Vat
Blue 4, C.I. I. Vat Blue 6, C.I. I. Vat Blue 14, C.I. I. Vat Blue 20, C.I. I. Vat
Vat dye such as Blue 35, C.I. I. Disperse Violet 1, C.I. I. Disperse Violet 4,
C. I. Disperse Violet 10, C.I. I. Disperse Blue 3, C.I. I. Disperse Blue 7,
C. I. Disperse dyes such as Disperse Blue 58, C.I.
I. Solvent Violet 13, C.I. I. Solvent Violet 14, C.I. I. Solvent Violet 21, C.I. I. Solvent Violet 27,
C. I. Solvent Blue 11, C.I. I. Solvent Blue 12, C.I. I. Solvent Blue 25, C.I. I. There are oil-soluble dyes such as Solvent Blue 55.

In the practice of the present invention, a method of supporting a substantially water-insoluble dye on colloidal silica is as follows. Water such as alcohols, dioxane and tetrahydrofuran is added while stirring in the presence of colloidal silica. There is a method of adding a dye dissolved in a soluble solvent.

Specific examples of the water-soluble organic solvent include methyl alcohol, ethyl alcohol, isopropyl alcohol, n-butyl alcohol, t-butyl alcohol, hexyl alcohol, acetone, dioxane, methyl ethyl ketone, tetrahydrofuran, pyridine, N-methylpyrrolidone and dimethyl. There are formamide, dimethylsulfoxide, acetonitrile and mixtures thereof. In addition, a small amount of a poorly water-soluble solvent such as benzene, toluene, xylene, chloroform, and ethyl acetate may be supplementarily used.

In the practice of the present invention, the colloidal silica, which is a source of supported particles of a dye which is substantially water-insoluble, is grown by partial neutralization of sodium silicate or partial removal of sodium by an ion exchange method. Colloidal silica, colloidal silica in which most of sodium is removed by ion exchange after stopping particle growth, colloidal silica in which some of the silicon atoms of silicon dioxide particles are replaced with aluminum atoms and the particles are negatively charged. It is possible to use various colloidal silicas such as silica and positively charged colloidal silica obtained by precipitating hydrous alumina on the particle surface.

The primary particle size of colloidal silica is 2
˜100 nm can be used, but preferably 30 nm
The following is particularly preferable, and 10 nm or less is preferable. The secondary particle size is preferably 100 nm or less, and it can be used if the sedimentation amount after standing for 1 week is less than 1%. A one-dimensional structure in which agglomeration extends in a chain can also be used. These colloidal silicas are marketed under the trade names of Cyton (product of Ei DuPont), Snowtex (product of Nissan Chemical Co., Ltd.), Adelite (product of Asahi Denka Co., Ltd.), Cataloid (product of Catalyst Kasei Co., Ltd.), etc. Has been done.

In the practice of the present invention, the amount of the substantially water-insoluble dye-supported particles used is appropriately selected from the range of 3 to 300 times the weight of the dye. If this amount is too small, it cannot have a sufficient dye-carrying ability and only uneven processing can be performed. If the amount is too large, the bond strength of the hydrophilic colloid undercoating layer is lowered, and the film-forming property between the photographic constituent layers such as emulsion layer and image receiving layer and the support is impaired.

As the hydrophilic colloid used in the undercoat layer in the present invention, soluble proteins typified by gelatin, soluble polymeric sugars, nitrogen-containing sugar-like structural polymers such as chitin and chitosan, polyvinyl alcohol, polyacrylamide. The water-soluble synthetic polymer and the modified products thereof are used alone or in combination, and gelatin is generally used.

The coating amount of the hydrophilic colloid is not particularly limited, but from the viewpoint of the image sharpness of the photographic material, it is better not to be too much, preferably 10 to 500 mg / m ² .
Particularly preferably, it is 20 to 100 mg / m ² .

In the practice of the present invention, an apparatus for applying a hydrophilic colloid undercoat to a resin-coated paper includes an air knife coater, a roll coater, a slide hopper coater, a gravure coater, a flexogravure coater, a fountain coater, an extrusion coater and a bar. Included are coaters, blade coaters and combinations thereof.

Prior to coating, it is desirable to activate the surface of the resin-coated paper support by corona treatment, flame treatment, or the like. The coating liquid is preferably applied uniformly, and therefore it is preferable to add a surfactant to the coating liquid or to apply a DC voltage to the surface of the resin-coated paper support to reduce uneven charging. Examples of the drying device for the applied coating liquid include various drying devices such as a straight-tunnel dryer, an arch dryer, an air loop dryer, a hot air dryer such as a sine curve air float dryer, a dryer using infrared rays, a heating dryer microwave, and the like. You can

Examples of the polyolefin resin for coating the resin-coated paper used in the practice of the present invention include homopolymers of olefins such as low density polyethylene, high density polyethylene, polypropylene, polybutene, polypentene and polymethylpentene, or ethylene-propylene copolymer. Examples thereof include a copolymer composed of two or more kinds of olefins such as a coalesce and a mixture thereof, and various density and melt viscosity index (melt index; hereinafter abbreviated as MI) can be used alone or in combination.

In the resin layer of these resin-coated papers, white pigments such as titanium oxide, zinc oxide, talc and calcium carbonate, fatty acid amides such as stearic acid amide and arachidic acid amide, zinc stearate, stearic acid. Fatty acid metal salts such as magnesium and calcium palmitate, dispersants such as organosilicon compounds such as polyorganosiloxane, 1,3,5-trimethyl-2,4,6-tris (3,5-di-t-butyl-4) -Hydroxybenzyl) benzene, tetrakis [methylene (3,5-di-t
-Butyl-4-hydroxy-hydrocinnamate)] methane, 1,3,5-tris (4-t-butyl-3-hydroxy-2,6-dimethylbenzyl) isocyanurate, 4,4'-thiobis- ( Antioxidants represented by hindered phenols such as 6-t-butyl-o-cresol, Tinuvin 320, Tinuvin 326, Tinuvin 32
It is preferable that various additives such as UV absorbers such as 8 (above products of Ciba Geigy) are appropriately combined and contained.

In view of the object and constitution of the present invention, it is necessary to include ultramarine, dark blue, chromophthalblue A3R, phthalocyanine blue, cobalt violet, quinacridone red, and other coloring pigments and dyes, optical brighteners, etc. in the resin layer. However, as long as the content is very small, it does not hinder the present invention.

The resin-coated paper used in the method for producing a photographic support of the present invention is produced by extrusion-coating a molten polyolefin resin on a running base paper in a film form from a slit die. At that time, it is desirable to activate the base paper surface by corona treatment, flame treatment or the like prior to melt extrusion coating. The thickness of the coating resin layer is not particularly limited, but generally about 5 μm to 50 μm is advantageous. The side of the resin-coated paper on which the silver halide photographic constituent layer is provided has a glossy surface, a matte surface, a matte surface, etc. depending on the purpose, and the back surface is usually a matte surface.

In a standard embodiment of the photographic support and photographic material of the present invention, it is desirable to contain 9 to 20% by weight of titanium oxide in the resin layer on the image forming side. The type of titanium oxide may be rutile type titanium oxide or anatase type titanium oxide, but considering the sharpness of the photographic material, it is preferable to contain rutile type titanium oxide in a high concentration. When the resin layer on the side where an image is formed is subjected to multilayer extrusion coating, the resin layer on the side closer to the base paper does not necessarily need to contain titanium oxide. As a method for containing these titanium oxides in the resin, either a method of preparing a master batch containing titanium oxide in a high concentration in advance or a method of preparing a compound by adjusting the concentration from the beginning to the final use concentration may be used. .

The base paper of the resin-coated paper may be any of ordinary natural pulp paper, synthetic fiber paper or so-called synthetic paper obtained by quasi-synthesizing synthetic resin film, but softwood pulp, hardwood pulp and softwood hardwood mixed pulp. Natural pulp paper containing wood pulp as a main component is advantageously used, and various types such as kraft pulp, sulfite pulp and soda parf can be used.

The base paper containing natural pulp as a main component may contain various sizing agents and various polymer compounds at the time of preparing the stock slurry. Examples of the sizing agent which is preferably contained in the base paper preferably used in the practice of the present invention include aliphatic metal salts and / or fatty acids, alkyl ketene dimers, alkenyl or alkyl succinic anhydrides, and JP-A-53-147211. Examples thereof include the epoxidized higher fatty acid amides and the organic fluoro compounds described in JP-A-56-109343.

More specifically, the pulp is used with or without a fatty acid metal salt or / and a fatty acid, a water-soluble salt in a form of being fixed to the pulp with a water-soluble aluminum salt such as aluminum chloride, vanadium sulfate and polyaluminum chloride. And an alkyl ketene dimer or a combination size of an alkyl ketene dimer and an epoxidized higher fatty acid amide.

As the fatty acid metal salt and / or fatty acid, those having 12 to 22 carbon atoms are preferable, and the addition amount thereof is preferably in the range of 0.5 to 4.0% by weight based on the absolute dry weight of pulp. Further, the addition amount of the water-soluble aluminum salt, which is added as necessary, is preferably in the range of 1/20 to 4/1, and particularly preferably in the range of 1/10 to 1/1 with respect to the sizing agent based on the solid weight.

As the alkyl ketene dimer,
The alkyl group has 8 to 30 carbon atoms, preferably 12 to 18 carbon atoms.
Things are good. Alkyl ketene dimer is usually marketed as an emulsion thereof, and specific examples thereof include Accorpel 360XC manufactured by Dick Hercules Co., Ltd. The amount added is preferably in the range of 0.2 to 4.0% by weight based on the dry weight of pulp and the amount of alkyl ketene dimer.

As the polymer compound which is preferably contained in the base paper preferably used in the practice of the present invention at the time of preparing the stock slurry, there may be mentioned a cationic wet strength agent, a cationic, anionic strength or an amphoteric strength agent. . As the cationic wet strength agent, a polyamine polyamide epichlorohydrin resin is preferable, and the addition amount thereof is in the range of 0.05 to 4.0% by weight based on the absolute dry weight of pulp.
Particularly, the range of 0.15 to 1.5% by weight is preferable. Specific examples thereof include Kaimen 557H, Kaimen S-25, and Epinox P-13 manufactured by Dick Hercules Co., Ltd.
There is 0 etc.

As the cationic, anionic or amphoteric paper strength enhancer, a cationized starch described or exemplified in JP-B-60-17103, Japanese Patent Application No. 62-496.
Cationic polyvinyl alcohols described or exemplified in JP-A No. 99-85432, JP-A-57-185432, and JP-A-57-1.
Cationic polyacrylamide described or exemplified in 97539, Anionic polyacrylamide described or exemplified in JP-B-62-31118, JP-B-61-3
7613, amphoteric polyacrylamides described or exemplified in JP-A-59-31949, JP-A-59-1257.
No. 31 or the exemplified plant galactomannan can be mentioned. The addition amount of them is preferably in the range of 0.05 to 8% by weight, particularly 0.15 to 4 per dry weight of pulp.
A weight% range is preferred.

The base paper preferably used in the practice of the present invention may contain various additives at the time of preparing the stock. As a filler, clay, kaolin, calcium carbonate, barium sulfate, magnesium silicate, titanium oxide, etc., as a pH adjuster, caustic soda, sodium carbonate, etc., as a coloring pigment, coloring dye, fluorescent brightening agent
Those described or exemplified in Japanese Patent Application No. 4-147033, Japanese Patent Application No. 62-37555, Japanese Patent Application No. 63-96516, etc. may be appropriately combined and contained.

The base paper preferably used in the practice of the present invention may contain various water-soluble polymers, antistatic agents and additives by spraying or tab size press. As a water-soluble polymer, Japanese Patent Application No. 63-9
As the antistatic agent such as the starch-based polymer, polyvinyl alcohol-based polymer, gelatin-based polymer, polyacrylamide-based polymer, and cellulose-based polymer described or exemplified in No. 6516, sodium chloride and chloride described or exemplified in Japanese Patent Application No. 63-96516. Alkali metal salts such as potassium, alkaline earth metal salts such as calcium chloride and barium chloride, colloidal metal oxides such as colloidal silica, organic antistatic agents described in JP-A-58-82242, latexes, etc. , Emulsions, petroleum resin emulsion, styrene-acrylic acid-acrylic acid ester copolymer, styrene-acrylic acid-butadiene copolymer, ethylene-vinyl acetate copolymer, styrene-maleic acid-acrylic acid ester copolymer Such as latex and pigment , Clay, kaolin, talc,
Barium sulfate, titanium oxide, etc., as a pH adjusting agent, hydrochloric acid, phosphoric acid, citric acid, caustic soda, sodium carbonate, etc., and the above-mentioned other color pigments, coloring dyes, optical brighteners and the like may be appropriately combined and contained. It is advantageous.

For the papermaking of the base paper which is preferably used in the practice of the present invention, a commonly used paper machine such as a Fourdrinier paper machine or a round net paper machine is used, but it is disclosed in JP-A-58-37642 and 61-61. It is advantageous to employ a suitable papermaking method as described or exemplified in US-260240. Further, the thickness of the base paper is not particularly limited, but after the base paper is made into paper, it is disclosed in JP-A-58-37642 and JP-A-60-126.
The base paper is preferably calendered as described or exemplified in No. 397 and has a basis weight of 40 g / m 2.
It is preferably from ^{2 to} 250 g / m ² .

Various back coat layers can be coated on the photographic support according to the present invention for the purpose of preventing static charge and curling. Further, the back coat layer is provided with JP-B-52-1820, JP-B-57-9059, JP-B-57-53940, JP-B-58-56859, JP-A-59-214849, and JP-A-58-184144.
Or an inorganic antistatic agent, an organic antistatic agent, a hydrophilic binder, a latex, a curing agent, a pigment,
A surfactant or the like can be contained in an appropriate combination.

Various photographic materials can be obtained by providing the photographic support of the present invention with various silver halide photographic emulsion layers or photographic constituent layers such as an image receiving layer of a diffusion transfer material.
For example, photographic materials provided with silver chloride, silver bromide, silver chlorobromide, silver chloroiodobromide emulsion layers, multilayer silver halide color photographic materials containing color couplers corresponding to each color-sensitive emulsion layer, for example, Various materials such as physical development nuclei such as heavy metals or sulfides thereof or image receiving materials for diffusion transfer materials provided with a layer containing a fixing agent for diffusing dyes are applied to the photographic support produced in the present invention. I can.

As the binder for the photographic constituent layers, hydrophilic macromolecular substances such as polyvinylpyrrolidone, polyvinyl alcohol, and sulfate compounds of polysaccharides can be used in addition to ordinary gelatin.

Various additives can be incorporated in the above-mentioned photographic constituent layers. For example, as sensitizing dyes, cyanine dyes, merocyanine dyes, etc., as chemical sensitizers, water-soluble gold compounds, sulfur compounds, etc., antifoggants or stabilizers, hydroxy-triazolopyrimidine compounds, mercapto-heterocyclic compounds, etc. , Formalin, vinyl sulfone compound, aziridine compound, epoxy compound, acrylic ester compound, halogenated -s-triazine compound, etc. as a hardening agent, as coating remover, benzene sulfonate, sulfosuccinate ester salt, etc. , Dialkylhydroquinone compounds, etc., and other suitable substances such as fluorescent whitening agents, sharpness improving dyes, antistatic agents, pH adjusters, fogging agents, and water-soluble iridium, water-soluble rhodium compounds when silver halide is produced or dispersed. To blame Come.

The photographic material relating to the present invention is exposed, developed and stopped as described in "Photosensitive Material and Handling Method" (Kyoritsu Shuppan, Goro Miyamoto, Photographic Technology Course 2) according to the photographic material. However, the multi-layer silver halide color photographic materials which are subjected to one-bath bleach-fixing treatment after color development are CD-III and CD-I.
V (the above two compounds are trade names of Kodak Co.) and Doroxicrome (trade name of May and Baker Co.) can be used for processing with any color developing solution.

The developer containing such a main agent may contain a development accelerator such as benzyl alcohol, thallium salt or phenidone, or it may be processed with a developer substantially containing no benzyl alcohol.

A useful bleaching agent for a one-bath bleach-fixing solution is a solution of a metal salt of aminopolycarboxylic acid (for example, a ferric complex salt of ethylenediaminetetraacetic acid, propylenediaminetetraacetic acid, etc.), and thiosulfate as a fixing agent Soda, ammonium thiosulfate, etc. are useful. Various additives can be contained in the one-bath bleach-fixing solution. For example,
Desilvering accelerators (eg mercaptocarboxylic acids described in US Pat. No. 3,512,979, Belgian Patent 682,
No. 426), antifouling agents, pH adjusters or pH buffers, hardeners (eg magnesium sulfate, aluminum sulfate, potassium alum, etc.), surfactants, and various other compounds. It can be contained in combination. Further, such a one-bath bleach-fixing solution can be used at various pHs, but the useful pH range is pH 6.0.
Is ~ 8.0.

[0050]

EXAMPLES Examples will be described to more specifically describe the present invention.

Examples 1 to 5 and Comparative Examples 1 to 3 50 parts by weight of hardwood bleached kraft pulp and 50 parts by weight of softwood bleached sulfite pulp were beaten to a Canadian Standard Freeness of 310 ml, and further to 100 parts by weight of pulp. Then, 3 parts by weight of cationized starch, 0.2 part by weight of anionized polyacrylamide, 0.4 part by weight of an alkyl ketene dimer emulsion (as ketene dimer content), and 0.4 part by weight of polyamine polyamide epichlorohydrin resin were added. A quantity of 160 g / m ² of paper was produced. The obtained wet paper is dried at 110 ° C., and subsequently 3 parts by weight of carboxy-modified polyvinyl alcohol, 0.05 part by weight of optical brightener, 0.002 part by weight of blue dye, 0.2 part by weight of citric acid and 97 parts by weight of water. 25g of impregnating liquid
/ M ² impregnation, drying with hot air at 110 ° C, and further linear pressure 9
Supercalendering was carried out at 0 Kg / cm to produce a base paper for photographic resin-coated paper. Next, after performing corona discharge treatment on both sides of the base paper, high density polyethylene (density 0.9
A 1: 1 mixture of 6 g / cm ³ , MI7) and low-density polyethylene (density 2.923 g / cm ³ , MI5) was coated at a resin temperature of 330 ° C. using a melt extruder to a thickness of 30 μm.

Then, on the surface of the base paper, a master batch of high-density polyethylene (density 0.96 g / cm ³ , MI7), low-density polyethylene (density 0.918 g / cm ³ , MI5) and the titanium dioxide pigment shown in Table 1 was prepared. By weight 4
The mixture of 5:25:30 was melt extrusion coated at a resin temperature of 320 ° C. to a thickness of μm. At that time, the surface containing the titanium dioxide pigment was processed into a completely glossy surface, and the surface quality of polyethylene on the back was processed into a matte surface such as paper.

Next, the front and back resin surfaces are subjected to corona discharge treatment,
On the back side, a coating solution comprising 1% by weight of a sodium salt of a styrene-maleic anhydride copolymer, 5% by weight of colloidal silica, 0.2% by weight of an epoxy compound and a trace amount of a surfactant was applied at 5 g / m ² with a bar coater. It was dried and antistatic processed.

Next, a coating liquid comprising 1% by weight of gelatin, a coloring agent shown in Table 1 and a trace amount of a surfactant was applied on the surface with an air knife coater at 5 g / m ^{2 and} dried to prepare a resin-coated paper type photographic support. did.

A part of the obtained photographic support was gelatin 6
Wt%, 2,6-dichloro-4-hydroxy-s-triazine soda 0.05 wt%, a coating liquid consisting of a trace amount of a surfactant at a coating amount of 80 g / m ² and dried, and at 50 ° C. for 8 hours. Save and use it as simulated photographic paper, D-72 developer 1: 2
1 minute and a half for diluted solution (20 ° C), 30 seconds for 3% acetic acid solution, F
-5 Color change meter 1001DP manufactured by Nippon Denshoku Industries Co., Ltd. was used to measure the hue change before and after a series of treatments of dipping in fixing solution for 2 minutes and washing with water for 5 minutes
Checked by type. The results are shown in Table 1.

[0056]

[Table 1]

(Note) The resin and subbing data in Table 1 represent% by weight based on the total amount. MB1: low density PE (density 0.918, MI9) 47.
5 parts by weight, 50 parts by weight of rutile-type titanium dioxide pigment surface-coated with 0.5% by weight of Al ₂ O ₃ hydrated alumina, and 2.5 parts by weight of zinc stearate may be used at about 150 ° C. using a Banbury mixer. It was made by kneading. MB2: low-density PE (density 0.918, MI9) 46.
Using a Banbury mixer, 25 parts by weight, 50 parts by weight of a rutile titanium dioxide pigment surface-coated with 0.5% by weight of Al ₂ O ₃ as water-containing alumina, 1.25 parts by weight of ultramarine blue, and 2.5 parts by weight of zinc stearate were mixed in a Banbury mixer. It was prepared by thoroughly kneading at about 150 ° C. Dispersion 1: Colloidal silica prepared with water to a solid concentration of 1% by weight; Snowtex-SS (Nissan Chemical Co., Ltd. product)
VALI FAST COLOR BLUE # prepared to 1% by weight with ethanol while stirring 100 parts by weight.
It was prepared by adding 10 parts by weight of 1603 (product of Orient Chemical Co., Ltd.). Dispersion 2: 100 parts by weight of Snowtex-SS having a solid content concentration of 1% by weight, with stirring, was adjusted to 1% by weight with ethanol, VALI FAST COLOR PINK #.
It was prepared by adding 10 parts by weight of 2310 (product of Orient Chemical Co., Ltd.). Dye 1: ACID BLU adjusted to 0.5% by weight with water
E 41. b-value standard deviation: sample standard deviation of the b-value obtained by measuring the color in the center of the paper width direction for each 100 m of the support and calculating with the n number 50. Process Δb (a): Increase amount of the b (a) value due to the process.

As can be seen from Table 1, in Examples 1 to 5, the standard deviation of the b value is small and the hue change of the processing is not so large. On the other hand, in Comparative Example 2, the hue adjusting effect is almost lost after the treatment. Further, Comparative Example 3 has a large b value standard deviation.

Example 6 and Comparative Example 4 The coating resin formulations of Examples 1 to 4 and Comparative Example 3 were melted using a screw type extruder having an extrusion diameter of 65 mm and a melt extruder having a 750 mm wide T-die. After melting for 2 hours at 320 ° C. and a screw rotation speed of 100 rpm, the number of stains generated on the die lip was counted and measured. Example 6
Was 4 and Comparative Example 4 was 51.

[0060]

According to the production method of the present invention, it is possible to produce a photographic support with less white spots, less variation in hue, no streaks, microgrit, or bleed-out phenomenon, without causing lip stains. .

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁵ Identification code Internal reference number FI Technical display location D21H 27/00 G03C 1/91

Claims (4)

[Claims] 1. A photographic support comprising a step of coating a resin-coated paper with an undercoat liquid containing a substantially water-insoluble dye supported on silica particles of colloidal silica and drying it. Manufacturing method. 2. A method of supporting the dye on silica particles is to inject a dye solution obtained by previously dissolving it in an organic solvent compatible with water into a colloidal silica solution while stirring. Item 1. A method for producing a photographic support according to Item 1. 3. The production of a photographic support according to claim 1, wherein the step of applying the undercoat liquid is carried out after coating both sides of the paper with the resin and before winding. Method. 4. The method for producing a photographic support according to claim 1, 2 or 3, wherein the resin is a polyolefin and the coated surface is subjected to corona treatment prior to the step of coating the undercoat liquid.