JPH01257844A - Photographic support and production thereof - Google Patents

Abstract

PURPOSE:To obtain a high quality photographic support preventing yellowing and maintaining satisfactory adhesive property without reducing the intrapaper strength even when irradiated with electron beams, by impregnating resin curable with electron beams into the surface of a paper support. CONSTITUTION:Resin curable with electron beams is impregnated into the surface of a paper support and cured by irradiation with electron beams and an opaque resin coating layer contg. a white pigment is formed on the support. The resin curable with electron beams is selected in consideration of conditions such as curing characteristics, the high density dispersibility of the white pigment, weather resistance film strength, heat resistance, curling characteristics and adhesive property to the support. A high quality photographic support preventing yellowing is obtd. This support can maintain satisfactory adhesive property without reducing the intrapaper strength even when irradiated with electron beams so as to cure the opaque resin coating layer.

Description

[Detailed description of the invention] (A) Industrial application field The present invention relates to a support for photographic paper.

More specifically, the present invention relates to a water-resistant photographic support in which the support is impregnated with an electron beam curable resin, cured by electron beam irradiation, and then coated with a resin containing a white pigment.

(B) Prior Art In recent years, waterproof paper in which a polyolefin resin layer into which a white pigment has been kneaded is provided on the surface of a base paper serving as a support has been mainly used as a photographic support. The main reason for providing a polyolefin resin layer on the base paper is to prevent processing chemicals from penetrating into the base paper during development, and this coating layer makes it possible to shorten the development time. Since no processing chemicals remain in the base paper, yellowing due to aging can be avoided. Coating of base paper with such polyolefin resin is generally done using a melt extruder. Inorganic white pigments such as titanium dioxide are mixed in to improve the resolution of photographic paper.

(C) Problems to be Solved by the Invention However, polyolefin resins have extremely high viscosity even when melted, and it is difficult to disperse inorganic pigments such as titanium dioxide, and there are only a few types of polyolefin resins that can be used. It was limited. Furthermore, there is a limit to the filling rate of inorganic pigments, and in order to obtain a certain degree of hiding power and whiteness, it is necessary to increase the thickness of the resin. Further, since such melt extrusion coating of polyolefin resin is performed at a temperature higher than the thermal decomposition temperature of the polyolefin resin, yellowing and pinholes are generated in the resin layer due to thermal decomposition of the resin. Furthermore, as the extrusion speed increases, the adhesion with the base paper decreases,
This had the problem of causing a decline in the quality of the final product.

In "Producing Resin-Coated Photographic Supports", melt-extrusion techniques can be used to thin the opaque resin coating layer while retaining adequate hiding power and to increase coating speed without deteriorating quality. Because it is difficult to increase
A white pigment is kneaded into base paper for photographic printing paper, and an electron beam curable resin (hereinafter referred to as an electron beam curable composition) is coated thereon.
A method has been proposed in which a water-resistant photographic support is produced by irradiating the support with an electron beam to form an opaque resin coating layer (see, for example, Japanese Patent Publication No. 17104/1983). In this method, a coating liquid in which a white pigment is dispersed at a high concentration in an acrylate-1 to ester resin having unsaturated bonds that can be polymerized by electron beam irradiation is applied onto base paper for photographic paper, and the coating liquid is applied to a base paper for photographic paper. This is a method in which an opaque resin coating layer is formed on the surface of the base paper by polymerization and crosslinking using radiation irradiation, so the opaque resin coating layer can be made thinner without reducing the hiding power, and the yellowing of the resin caused by the melt extrusion method can be avoided. It is now possible to produce a water-resistant photographic support without deteriorating the quality of the final product due to the formation of pinholes, poor adhesion of the resin layer, blocking or matte finish.

However, in the production of photographic supports using electron beam curable compositions, when the opaque resin coating layer highly filled with white pigment is thinned and processed at high speed, no unreacted electron beam curable resin remains. As such, a somewhat excessive amount of electron beam irradiation is required.

This is because, if there is unreacted electron beam curable resin in the opaque resin coating layer, the development processing reagent will be taken into the opaque resin coating layer after the development process and will cause coloring. Such excessive electron beams are taken into the base paper layer located below the opaque resin coating layer, but at this time, the cellulose fibers constituting the base paper are also cut. This means that the interpaper strength decreases, and the peel strength after developing the photographic paper made by this method decreases.
This caused serious spacing that caused problems with adhesion.

Furthermore, when paper is irradiated with electron beams, the paper support becomes yellow due to deterioration of the cellulose, which is unsightly, which is a fatal problem for photographs.

[93 Means for Solving the Problems As a result of intensive research into means for solving the above-mentioned problems, the inventors have found the following solution. That is, in the photographic support, paper is impregnated with an electron beam curable resin, and an opaque resin coating layer containing a white pigment is provided on the paper support that is cured by electron beam irradiation. It is an invention of When photographic paper was prepared using the photographic support of the present invention and a development test was conducted to measure the peel strength of the emulsion layer, it was found that both the emulsion layer and the opaque resin coating layer had a balanced and good peel strength. It was found that good adhesion was achieved.

Furthermore, the present invention surprisingly has the unexpected effect of suppressing the yellowing of paper, which is inevitable in the process of curing resin by electron beam irradiation using paper as a support. Ta.

In the present invention, the opaque resin coating layer may be a molten polyolefin resin layer consisting of a white pigment and a polyolefin resin instead of the electron beam curable composition. However, when a polyolefin resin coating layer was provided using a paper support impregnated with the electron beam curable resin of the present invention and then cured by electron beam irradiation, the polyolefin resin and the paper support were hardened. It has been found that the photographic support has extremely good adhesive strength with the photographic support and is less likely to be penetrated by developer.

The present invention will be explained in detail below.

In the present invention, in order to impregnate paper with an electron beam curable resin, there are two methods: from the papermaking stage, the electron beam curable resin is dispersed in what is called white water in the paper industry and adsorbed to cellulose fibers, and after the papermaking process, it is applied to a tab. There are two types of methods: adsorption to cellulose fibers by immersion. In this case, the electron beam curable resin can be used alone, dissolved in a solution, or in the form of an emulsion to improve impregnation. Since the paper-to-paper strength is reduced by electron beam irradiation only on the electron beam irradiation side, it is more efficient to intensively adsorb and impregnate the electron beam curable resin on only one side using a tab.

The electron beam curable resin used in the present invention is selected in consideration of conditions such as electron beam curable properties, high concentration dispersibility of white pigment, weather resistance, film strength, heat resistance, curling properties, and adhesion to the support. You can choose.

Further, the electron beam curable resin to be impregnated into paper may be applied in the form of a solution or emulsion, dried, and then cured by electron beam irradiation. Examples of electron beam curable resins include unsaturated polyesters having electron beam reactive groups at the molecular ends or side chains, modified unsaturated polyesters, acrylic polymers, and monomers having unsaturated bonds, alone or in combination with other Can be used with solvents. Representative examples of electron beam polymerizable resins are shown below.

(a) Polyester acrylate-1 to polyester methacrylate, e.g. Aronix M-5300, Aronix M
-54,OO, Aronix M-5,500, Aronix M-5600, Aronix M-5700,, Aronix M-61.00-Aronix M-6200,
Aronix M-6300, Aronix M-6500
, Aronix M-7100, Aronix M-803
0, Aronix M-8060-Aronix M-81
00 (all product names of Toagosei Kagaku Kogyo Co., Ltd.), Viscodoor 00, Visco? -3700 (the above is a trade name of Osaka Organic Chemical Industry Co., Ltd.), Kayarad HX-220, Kayarad HX-620 (the above is a trade name of Nippon Kayaku Co., Ltd.), and the like.

(b) Urethane acrylate, urethane methacrylate-1
・For example, Aronix M-1100, Aronix M-
1,200, Aronix M-1210, Aronix M-1250, Aronix M-1260, Aronix M-1300, Aronix M-1310 (all of the above are Toagosei Chemical Co., Ltd. brand names), Visco-1-812 , Visco-1-823,
Examples include Visco-1-823C (trade name, Osaka Organic Chemical Industry Co., Ltd.), NK ester, tJ-108-A, NK ester, U-4HA (trade name, Shin-Nakamura Chemical Co., Ltd.).

(C) Monofunctional acrylate, monofunctional methacrylate-1~,
Vinylpyrrolidone, for example, methyl acrylate, ethyl acrylate, butyl acrylate-1~, 2-ethylhexyl acrylate, 2-hydroxyethyl acrylate-1~, 2-hydroxyethyl methacrylate, 2-hydroxypropyl acrylate-1~, te )・Ushidorofurfuryl acrylate,
Phenoxyethyl acrylate, cyclohexyl acrylate, cyclohexyl methacrylate-1, acryloyl maltumeline, benzyl acrylate, glycidyl methacrylate-1, N-N-dimethylaminoethyl acrylate, N,N-dimethylaminoethyl methacrylate
1~, N-N-diethylaminoethyl methacrylate,
11~xyethyl acrylate), vinyl p10-q lolidone, etc., ethylene oxide modified phenoxylated phosphoric acid acrylate, ethylene oxide modified butoxylated phosphoric acid acrylate, and other products such as Toagosei Chemical Industry Co., Ltd.'s product name Aronix. M-101, Aronix M
-102, Aronix M-111-Aronix M-
113, Aronix M-114, Aronix M-1
17, Aronix M-152, Aronix M-15
4 etc.

(d) Polyfunctional acrylate, polyfunctional methacrylate, for example, 1,6-hexanethiol diacrylate 1.
1,6-hexanediol dimethacrylate, neopentyl glycol diacrylate 1, diethylene glycol diacrylate 1~, polyethylene glycol diacrylate, polyethylene glycol dimethacrylate, polypropylene glycol diacrylate, polypropylene glycol dimethacrylate 1~, Pentaerythritol diacrylate, dipentaerythritol hexaacrylate-1~, incyanuric acid diacrylate-pentaerythritol triacrylate-1, incyanuric acid triacrylate, trimedylolpropane triacrylate, trimethylolpropane 1~remethacrylate, ethylene oxide modification Pentaerythritol 1-1-rutetraacryle-1-, propylene oxide-modified pentaerythritol tetraacryle-1-, propylene oxide-modified dipentaerythritol polyacrylate-1-, ethylene oxide-modified dipentaerythritol polyacrylate, pentaerythritol acrylic acid adduct Examples include acrylate-1 to ester. The product names of Toagosei Chemical Industry Co., Ltd. are Aronix M-210, Aronix M-215, Aronix M-220, Aronix M-230, Aronix M-233, and Aronix M-230.
Sox M-24Q,, Aronix M-245, Aronix M-305, Aronix M-309, Aronix M-310, Aronix M-315, Aronix M-320, Aronix M-325, Aronix M-330, Aronix M-400 , Aronix M-450, TO-458, TO-747, TO-7
55, THIC, TA2, etc.

Among these electron beam curable resins, trifunctional or higher functional acrylate resins are particularly preferred as electron beam curable resins to be impregnated into paper.

As the white pigment in the electron beam curable composition used in the present invention, white pigments such as rutile type or anatase type titanium dioxide, zinc oxide, talc, calcium carbonate, barium carbonate, barium sulfate, calcium sulfate, and silica are used. It can be used untreated or after surface treatment with siloxane, alumina, alcohol, etc. The proportion of the white pigment in the electron beam curable composition is preferably from 20% by weight to 80% by weight, especially 2% by weight.
It is preferably in the range of 0% to 70% by weight.

This means that if the proportion of white pigment is extremely small, it will not have the expected hiding power, and if it is too large, it will not only lack the ability to act as a binder for electron beam curable resins, but also reduce the amount of electron beam irradiation. This is because it causes an increase in the amount of water and has an undesirable effect on the base paper for photographic paper or the coating resin formed into a film.

The electron beam curable composition of the present invention contains pigments such as ultramarine, Kobal 1 to Violet 1, etc., which are used in the surface polyethylene layer of photographic supports prepared by the conventional melt extrusion method of polyolefin resins. Various additives such as dyes, antioxidants, optical brighteners, antistatic agents, dispersants, and stabilizers can be added in appropriate combinations.

In the present invention, since the electron beam curable resin is cured by electron beam irradiation, a reaction initiator is not required in principle, but a photoreaction initiator may be mixed in for the purpose of reducing unreacted resin. As photoinitiators, acel-phenones such as di- and trichloroacetyl-phenones, benzophenone, Michler's ketone, benzyl, benzoin,
Examples include benzoin alkyl ether, benzyl dimethyl ketal, tetramethylthiuram monosulfite, thioxanthone, azo compound, various silver salts, etc. The amount of photoreaction initiator used is usually 0.1 to 0.1 to the amount of electron beam curable resin.
It is in the range of 10%. In addition, a storage stabilizer such as Hy-1 to roquinone may be used in combination with the photoinitiator.

The base paper used as a support in the present invention can be ordinary natural pulp paper, synthetic fiber, or so-called synthetic paper made of synthetic resin film, but softwood pulp, hardwood pulp, and wood pulp mixed with softwood and hardwood can be used. Natural pulp paper based on is advantageously used. There are no particular restrictions on the thickness of the base paper, and its basis weight is 50.
g/m2 to 250 g/m2 is preferred.

The base paper mainly composed of natural pulp, which is advantageously used in the method of the present invention, may contain various polymeric compounds and additives. For example, starch derivatives, polyacrylamides, polyvinyl alcohol derivatives, dry paper strength agents such as gelatin, sizing agents such as fatty acid salts, rosin derivatives, dialkyl ketene dimer emulsions, and wet papers such as melamine resins, urea resins, and epoxidized polyamides. Power enhancers, stabilizers, pigments, dyes, antioxidants, optical brighteners, various latexes, electrolyte-free materials, pH adjusters, and the like can be contained in appropriate combinations.

In addition, in the present invention, even if the paper surface is subjected to surface treatment such as corona treatment in order to improve the adhesion and wettability between the paper and the opaque resin coating layer, the adhesion between the electron beam curable composition and the photosensitive emulsion remains In order to improve wettability, the surface of the resin may be subjected to a surface treatment such as corona treatment or Zabuyo 1~.

Further, on the back side of the photographic support of the present invention, a film can be formed by coating a polyolefin resin by the conventional melt extrusion method or by applying an electron beam curable resin and then irradiating it with an electron beam. Forming a resin coating layer by a method,
In addition, a Barafco-1 layer can be provided so as to provide writing properties on the back side.

A general pigment kneader can be used to prepare the electron beam curable composition. For example, two-roll, three-roll, ball mill, kneader-1 high-speed mixer,
Homogenizer etc.

The method for applying the electron beam curable composition onto base paper is as follows:
For example, methods such as frede coating, doctor coating, air knife coating, spray coating, squeeze coating, reverse roll coating, gravure roll and I-transfer roll coating, Ex-I lusion coating, and curtain coating are used. It is also possible to impregnate paper with an electron beam curable resin and then smooth it using a calendar or the like.

The polyolefin resin used in the present invention includes homopolymers of olefins such as polyethylene, polypropylene, polybutene, and polypentene, copolymers of two or more olefins such as ethylene/propylene copolymers, and mixtures thereof. Polyethylene is particularly advantageously used.

The thickness of the opaque resin coating layer made of an electron beam polymerizable composition or molten polyolefin resin varies depending on the type of base paper and the filling rate of white pigment, but is 2 to 100 μm, more preferably 3 to 50 μm, and is thinner than this thickness. However, it is difficult to obtain a coating layer with sufficient whiteness and opacity, and it is difficult to coat the coating layer uniformly.If the coating layer is thicker than this, it is difficult to coat the coating layer uniformly, which is not desirable in terms of quality. When using an electron beam curable composition, if the surface of the photographic support is to be given a mirror finish or a finish, the surface to be treated is brought into contact with a mirror roll or a finish roll and an electron beam is applied from the back side. It can be cured by irradiation and given a mirror finish. Alternatively, there is a method in which the surface is partially cured by preliminary electron beam irradiation, and then brought into contact with a mirror roll or molding roll and subjected to secondary irradiation to completely cure the surface. When using a molten polyolefin resin, a mirror surface or a patterned surface can be obtained by using a corresponding cooling roll.

The amount of electron beam curable resin impregnated into the paper varies depending on the distribution of the electron beam curable resin in the paper and the type of electron beam curable resin, but it can be 1% to 20% of the paper. preferable. If the amount of the electron beam curable resin is less than this range, the expected interpaper strength will not be achieved, and if it is more than this range, the paper will lose its flexibility, making it undesirable as a photographic support.

=18- For electron beam irradiation, the acceleration voltage is 10 in terms of penetrating power and curing power.
0-1.000kV, more preferably 100-1.000kV
One-pass absorption line I using a 300kV electron beam accelerator
It is preferable to rub so that the amount is 0.5 to 20 Mrad. If the accelerating voltage or electron beam irradiation amount is lower than this range, the penetrating power of the electron beam will be too low and sufficient curing will not occur, and if it is too high than this range, energy efficiency will not only deteriorate, but also the strength of the base paper will decrease. Unfavorable effects on quality such as decomposition of resins, resins, and additives may occur. The electron beam accelerator may be, for example, an electronic electron beam accelerator, a scanning type, a double scanning type, or the like.

Note that during electron beam irradiation, if the oxygen concentration is high, the curing of the electron beam curing resin will be hindered, so replacement with an inert gas such as nitrogen, helium, carbon dioxide, etc. is performed to reduce the oxygen concentration to 600 ppm or less, preferably. It is preferable to irradiate in an atmosphere suppressed to 400 ppm or less.

First method of impregnating electron beam curable resin into paper according to the present invention
The purpose of this is to suppress the decline in interpaper strength and yellowing due to deterioration of cellulose that occurs when a paper support is irradiated with an electron beam, and is not particularly intended to control mass transfer after curing. Therefore, if at least the surface vicinity of the base paper is reinforced with electron beam curable resin, there is no need for the electron beam curable resin impregnated into the paper to form a pinhole-free coating, and the pulp fibers that make up the base paper are opaque. There is no problem even if it comes into direct contact with the resin coating layer.

Further, on the opaque resin coating layer of the photographic support prepared according to the present invention, smoothness, water resistance, chemical resistance, easy cleaning properties, and adhesion with the photosensitive emulsion layer on the outermost surface of the photographic support,
A coating layer made of polyolefin resin G may also be provided to impart properties such as antifogging properties to the photosensitive emulsion.

Further, a primer layer may be provided between the paper support and the opaque resin coating layer to even out the unevenness of the paper support.

The photographic support prepared according to the present invention can be used as photographic paper by coating it with a photosensitive emulsion.

[83 Effect] Since at least the surface of the paper support of the photographic support produced in the present invention is impregnated with an electron beam curable resin, even when irradiated with an electron beam to cure the opaque resin coating layer, Good adhesion can be maintained without reducing interpaper strength. In addition, the effect of electron beam irradiation on the paper white body is reduced by the electron beam curable resin impregnated into the paper support, and as a result, a high quality photographic support that does not yellow can be obtained. 9 [F] Implementation EXAMPLES Hereinafter, the present invention will be explained in detail with reference to Examples, but the content of the present invention is not limited to the Examples.

Example-1 Low density polyethylene (density 0.918g/cm3) on the back side
, MI 5) and high density polyethylene (density 0.965g
/cm3, MI7) etc.1 mixture with an average thickness of 18 μm.T120g/rr? On the surface of photographic base paper, an average weight of 10 g of trimethylolpropane (1 to 100 g of trimethylolpropane) to 10 g of electron beam curable resin was applied to the surface of photographic base paper.
An electron beam irradiation device (200 ppm oxygen concentration) was used to replace the paper support with nitrogen (oxygen concentration 200 ppm) by using a tab press to impregnate the paper support so that the
Electron beam irradiation was carried out under the conditions of an acceleration voltage of 175 kV and an absorption line of 1:2 Mrad to cure the electron beam curable resin impregnated into the paper.

After corona treatment was performed on the obtained paper support, an electron beam curable composition having the following composition was applied to an average thickness of 5 μm, and cured by irradiation with an electron beam of 2 Mrad using an electron beam irradiation device. A photographic support was obtained.

(Electron beam curable composition) Rutile type titanium dioxide 50% by weight Electron beam curable resin 50% by weight Electron beam curable resin and rutile type titanium dioxide were mixed using a triple roll.

The electron beam curable resin contains α,ω-te1~laacryloyl(bistrimethylolpropane)-te1~lahydrophthalate, an amount of trimethylolpropane acrylate, and 1 to 25% by weight of 1,6-hexanedioldiacrylate. A mixture was used.

Example 2 The surface of a base paper for photographic paper whose back side was laminated with polyethylene (as in Example 1) was impregnated with trimethylolpropane (reacrylate) as an electron beam curable resin using a tab press G, and then subjected to electron beam curable resin. An electron beam curable composition was applied to the sample without irradiation. The electron beam curable composition and the electron beam curable resin impregnated into the paper were simultaneously cured by 4MI-ad electron beam irradiation to obtain a photographic support.

Example-3 As an electron beam curable resin, 1 to 1 was applied to the surface of a photographic paper base paper whose back side was laminated with polyethylene as in Example-1.
After impregnating limethylolpropane triacrylate-1- with Tab Press G, low-density polyethylene (density 0.918 g/cm3, MI), 8
．． '5) 30 parts of masterbatch kneaded with 4% titanium oxide, low density polyethylene (density, 9
A resin composition consisting of 45 parts of high density polyethylene (density 0.965 g/cm3, MI5) and 25 parts of high density polyethylene (density 0.965 g/cm3, MI5) was coated on Lamiho 1 to 20 μin thick. After that, the absorbed dose from the polyolefin resin side is 5
A photographic support was obtained by curing the electron beam curable resin by irradiating it with a C″-electron beam to obtain Mrad.

Example 4 An electron beam curable resin 1 was applied to the surface of a base paper for photographic paper whose back side was laminated with polyethylene 1 to 1 as in Example 1.
～Limethylolpropane triacrylate 1～ was impregnated by tab press, low density polyethylene (density 0.918 g/Cm3, MI5) 7 was used as the primer layer.
5 parts, high density polyethylene (density 0.965 g/cm
3, MI7) 25 parts of the resin composition was laminated to a thickness of 7 μm. After corona treatment, the same electron beam curable composition as in Example 1 was applied as an opaque resin coating layer, and electron beam irradiation was performed to form an absorption line of i 5 Mrad to bond the electron beam curable resin and electrons. A photographic support was obtained by curing the linearly curable composition.

Comparative Example-1 The same electron-beam curable composition as in Example-1 was applied without impregnating the surface of a base paper for photographic paper with polyethylene lamination on the back side as in Example-1 with an electron-beam-curable resin. did. The electron beam curable composition was cured by electron beam irradiation of 4 Mrad to obtain a photographic support.

Comparative Example 2 Photographic base paper G A photographic support was obtained by providing a primer layer and an opaque resin coating layer in the same manner as in Example 4, except that it was not impregnated with an electron beam curable resin.

The photographic supports obtained in Examples and Comparative Examples were
After corona treatment, a color silver halide photographic emulsion was applied and hardened in a conventional manner to obtain photographic paper, and after a series of development treatments, adhesion was measured. Adhesiveness was measured by making cuts with a razor in the shape of the substrate after drying, pressing standard adhesive tape on top of the cut, and instantly peeling off the photo paper. The surface state of (
Peeling status of emulsion layer, opaque resin coating layer, and base paper)
Regarding the yellowing of the base paper in particular, the yellowing of the 9 photographic papers evaluated using The whiteness of the back side of the photographic paper was compared and determined.

Table 1 summarizes the results regarding the adhesiveness and whiteness of the photographic supports prepared in Examples and Comparative Examples.

(The following is a blank space) 26-Table 1 [G] Effects of the Invention As is clear from Table 1, the present invention has at least the surface of the paper support impregnated with an electron beam curable resin;
Even when electron beam irradiation is applied to cure the opaque resin coating layer, good adhesion can be maintained without reducing interpaper strength. In addition, the electron beam curable resin impregnated into the paper support reduces the effects of electron beam irradiation on the white paper, resulting in a high-quality photographic support that does not yellow. You can create photographic paper.

Claims (5)

[Claims] (1) A photographic support characterized in that paper is impregnated with an electron beam curable resin and an opaque resin coating layer containing a white pigment is provided on the paper support that is cured by electron beam irradiation. body. (2) A primer layer made of a melt-extruded polyolefin resin is provided between the opaque resin coating layer and the paper support impregnated with an electron beam curable resin. Photographic support. (3) The photographic support according to claim 1, wherein the opaque resin coating layer is composed of a white pigment and an electron beam curable resin, and is a layer cured by electron beam irradiation. (4) Production of a photographic support characterized in that paper is impregnated with an electron beam curable resin, an opaque resin coating layer containing a white pigment is provided, and then cured by electron beam irradiation. Method. (5) In photographic supports, paper is impregnated with an electron beam curable resin, an opaque resin coating layer consisting of a white pigment and an electron beam curable resin is provided, and then the opaque resin coating layer and paper are bonded together by electron beam irradiation. 1. A method for producing a photographic support, which comprises simultaneously curing an impregnated electron beam curable resin.