JPH11314321A - Electron beam cured resin coated sheet - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the penetration of an electron beam curable resin into a sheet like base material and the folding crack of a resin coating layer following that of the sheet like base material and to enhance the adhesiveness of the sheet like base material to the resin coating layer. SOLUTION: An intermediate layer formed of a resin composition containing at least one resin selected from an acrylic resin, a urethane resin, an alkali salt of an ethylene/acrylic acid copolymer, a vinyl acetate/ethylene copolymer and a water-soluble polyurethane resin is arranged between a sheet like base material and a resin coating layer comprising an electron beam cured matter of a resin cured by the irradiation with electron beam.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electron beam-curable resin-coated sheet (excluding a photographic printing paper support). More specifically, in the present invention, a resin coating layer made of an electron beam cured product of a resin that is cured by irradiating an electron beam (hereinafter, referred to as an electron beam curable resin),
The present invention relates to an electron beam-curable resin-coated sheet excluding a photographic printing paper support, which is coated on a sheet-like substrate and has improved adhesion between the sheet-like substrate and the resin coating layer. The electron beam-curable resin-coated sheet according to the present invention does not include a photographic paper support unless otherwise specified.

[0002]

2. Description of the Related Art Heretofore, so-called baryta paper has been used as a support for photographic printing paper. It is manufactured by applying a white pigment such as barium sulfate on both sides of paper having strong size and high strength. However, in recent years, instead of this, on both sides of a paper base,
BACKGROUND ART A polyolefin-coated water-resistant sheet produced by coating a polyolefin resin is known. Such a water-resistant resin-coated sheet has an advantage that the treatment liquid does not easily penetrate into the resin-coated sheet because the polyolefin coating layer is hydrophobic, and thus the washing time and the drying time are greatly reduced. , And because there is no penetration of the processing solution into the paper substrate,
The resin-coated sheet itself has advantages such as suppression of expansion and contraction and excellent dimensional stability.

However, an inorganic white pigment such as titanium dioxide is mixed in the polyolefin coating layer of such a water-resistant resin-coated sheet for the purpose of improving the hiding power or the resolving power. In addition, there are problems such as poor dispersibility in resin, and foaming due to volatile components contained in the pigment in the melt extrusion step to cause film cracking of the coating layer. Therefore, the pigment content in the coating layer cannot be increased to a sufficient level for improving the hiding power or the resolving power. Generally speaking, when titanium dioxide is used, it is reduced to about 20%.
It is difficult to mix in a polyolefin resin by weight or more. Therefore, the recording paper obtained by using such a resin-coated sheet was not sufficiently satisfactory in image sharpness.

In recent years, a so-called electron beam-curable resin composed of a resin composition curable by electron beam irradiation has been applied to a support, and electron beam irradiation has been applied thereto to cure the electron beam-curable resin coating layer. A resin-coated sheet for photographic printing paper having the following formula (for example, Japanese Patent Publication No. Sho 60-17104)
No., JP-B-60-17105, JP-A-57-4994.
No. 6, etc.). According to this method, the resin composition is not heated to a high temperature when the coating layer is formed, and the pigment content can be increased to 20 to 80% by weight. The image sharpness of photographic printing paper obtained by using photographic printing paper is remarkably improved as compared with photographic printing paper coated with polyolefin resin.

However, a resin-coated sheet for photographic printing paper manufactured by applying a photosensitive layer on a resin-coated layer cured by electron beam irradiation has an adhesive property between the sheet-like substrate and the resin-coated layer. Sometimes it was not enough. Therefore, there is a problem that the resin coating layer is peeled off from the sheet-like base material during handling of the photographic printing paper such as in a photographic development process or a photo appreciation, which significantly lowers the commercial value of the photographic printing paper. Was. In addition, in the photographic development processing step, if the sheet-shaped base material is broken, the resin coating layer is also broken, so that there is a need for improvement.

[0006]

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned drawbacks of the conventional resin-coated sheets for photographic printing paper and to obtain an electron beam-curable resin-coated sheet having excellent image sharpness. However, a photographic paper support is excluded).

[0007]

Means for Solving the Problems The inventors of the present invention have conducted intensive studies on the improvement of the adhesiveness and the crack prevention of the resin coating layer, and as a result, have found that the sheet-like base material and the resin coating layer have a small gap between them. By forming the intermediate layer with a resin composition containing at least one resin selected from acrylic resin, urethane resin, ethylene-acrylic acid copolymer alkali salt, vinyl acetate-ethylene copolymer and water-soluble polyurethane resin It has been found that the effect of preventing the penetration of the electron beam-curable resin into the sheet-like base material and the effect of preventing the resin coating layer from following the breaking of the sheet-like base material are improved. In particular, it has been found that the intermediate layer exhibits excellent barrier properties, and can also improve the adhesiveness between the sheet-shaped substrate and the electron beam-curable resin coating layer,
The present invention has been completed.

That is, the electron beam-curable resin-coated sheet of the present invention (excluding the support for photographic printing paper) comprises a sheet-like substrate and at least one layer formed on at least one surface of the sheet-like substrate. An intermediate layer, having a resin coating layer formed on the intermediate layer and made of an electron beam cured product of a resin that is cured by electron beam irradiation, wherein the intermediate layer is an acrylic resin, a urethane resin, an ethylene-acrylic resin. It is characterized by being formed from a resin composition containing at least one resin selected from an alkali salt of an acid copolymer, a vinyl acetate-ethylene copolymer and a water-soluble polyurethane resin.

The configuration and operation of the present invention will be described below. In the present invention, the intermediate layer formed between the sheet-shaped base material and the resin coating layer is composed of at least one layer, and may have a multilayer structure of two or more layers.
The resin composition for forming the intermediate layer includes an acrylic resin emulsion (for example, an aqueous emulsion of an acrylic resin such as a self-crosslinking type, a modified acrylic type and a carboxy modified type),
Urethane resin emulsions (e.g., aqueous emulsions such as self-emulsifying and forced emulsifying urethane resins), ethylene-acrylic acid copolymer alkali salts (e.g., copolymerization of ethylene (5-30%) and acrylic acid (95-70%)) And a vinyl acetate-ethylene copolymer emulsion (for example, vinyl acetate (95 to
65%) and an aqueous emulsion of a copolymer of ethylene (5-35%) and a water-soluble polyurethane resin (water-soluble by introducing a hydrophilic group into the molecule). May be used alone, or may be used in combination with one or more other resins. Further, it is also possible to mix these four types of resins with other resins.

Examples of such other resins include polyvinyl alcohol, acetoacetylated polyvinyl alcohol, modified polyvinyl alcohol containing silicon in the molecule, carboxyl group-modified polyvinyl alcohol, sulfone group-modified polyvinyl alcohol, and cationic group-modified polyvinyl alcohol. , Methylcellulose, ethylcellulose, hydroxyethylcellulose, carboxymethylcellulose, casein, arabicore, oxidized starch, etherified starch and the like.

Furthermore, it is inevitable to mix a pigment in the intermediate layer. As the pigment, any of titanium dioxide (anatase type and rutile type), calcium carbonate, clay, magnesium hydroxide, magnesium oxide and the like can be used. In particular, for the purpose of preventing impurities in the resin or fog derived from the resin irradiated with electron beams,
Mixing a magnesium compound in the interlayer resin
Extremely effective. The amount of the pigment to be blended in the intermediate layer resin is preferably in the range of 0.5 to 70% of the resin solid content. However, excessive mixing of magnesium hydroxide and magnesium oxide may cause color shock, and it is better not to add more than necessary. In addition, when the pigment is blended in the intermediate layer resin, compared with the case where the pigment is not blended, there is an advantage that the adhesiveness can be secured even with a smaller coating amount.

An additive, a water-proofing agent,
Dispersant, ultraviolet absorber, surfactant, conductive agent, defoamer,
Various auxiliaries such as a fluorescent dye and a coloring dye can be added as needed.

An intermediate layer provided between the sheet-like substrate and the resin coating layer formed on at least one surface of the sheet-like substrate is coated with a coating solution containing the above-mentioned resin composition, and heated. It is obtained by drying, but the conditions are not particularly limited. However, performing heat drying for a long time and / or at a very high temperature not only has an adverse effect, such as deteriorating the sheet-shaped base material, but also deteriorates the energy efficiency of the manufacturing process due to unnecessary heat drying.
Also, depending on the type of the water-soluble polymer compound, the film formation temperature is very low. In this case, even at room temperature drying, the formation of an interlayer coating film having the same water resistance and chemical resistance as heat drying can be achieved. It is possible.

The coating properties of the water-soluble polymer compound obtained by drying by heating or drying at room temperature are not only excellent in chemical resistance such as water resistance, acid resistance, alkali resistance and solvent resistance, but also excellent. It also has cold resistance and weather resistance.

[0015] The intermediate layer is disposed between the sheet-like substrate and a resin coating layer formed on at least one surface thereof. As a method of applying and forming an intermediate layer, a usual gravure coating method, a bar coating method, an air knife coating method,
Air doctor coating, blade coating, squeeze coating, roll coating, transfer coating,
Although a curtain coat method or the like can be applied, it can be applied in a sizing step during papermaking.

The sizing process is roughly classified into two types: an internal sizing method in which a sizing agent is contained in paper, and a surface sizing method in which a sizing agent is applied to the surface of paper, and the former and the latter are used in combination. Things are often done. However, in the present invention, in order to improve the adhesiveness between the sheet-like base material and the surface resin coating layer, formation of an intermediate layer by a surface size method is effective, but it is not possible to use it together with an internal size method. I can't do that.

The coating of the intermediate layer amount is preferably 0.3 to 3 g / m ^2, more preferably 1 to 3 g / m ^2. However, when the pigment is blended in the intermediate layer as described above, if the weight of the intermediate layer is 0.3 g / m ² or more, a sufficient adhesive effect can be recognized. When the coating amount is less than 0.3 g / m ² , the resulting intermediate layer cannot not only prevent the penetration of the electron beam-curable resin into the sheet-shaped substrate, but also provide an adhesive property between the sheet-shaped substrate and the resin coating layer. And the effect of preventing the resin coating layer from breaking following the sheet substrate is also reduced. Further, the adhesive effect of the intermediate layer becomes almost saturated when the weight of the intermediate layer becomes 3 g / m ² , and even if the coating amount is further increased, a greater improvement effect is not obtained, and the waste of resources is wasted. In addition, the liquid may sometimes penetrate from the end surface of the sheet-like substrate during development, and the edge penetration may deteriorate, which is not preferable.

When the resin coating layer side and the intermediate layer are provided only on one surface side of the sheet-like base material, the curl of the obtained sheet-like support is significantly increased. Further, fogging originating from the resin cured by electron beam irradiation occurs, and the fog increases in proportion to the increase in the coating amount. However, as a means for solving this, it is effective to mix a magnesium compound as described above.

Generally, an electron beam-curable resin composition used for a resin coating layer of a resin-coated sheet includes an oligomer which is a base resin, a monomer which is used for dilution and the like,
It is composed of a combination of various pigments, color adjusters and various additives. Electron beam-curable oligomers usually have a high viscosity and, therefore, are usually used after being diluted with a monofunctional monomer or a polyfunctional monomer to adjust the viscosity. However, even when used alone,
There is no problem with using the oligomer alone.

The resin coating layer formed on at least one surface of the sheet-like substrate of the present invention generally comprises an unsaturated organic compound curable by an electron beam, a white pigment, and if necessary, other additives. The composition is formed by electron beam curing of an electron beam curable composition containing an agent.

The electron beam-curable unsaturated organic compound used in the present invention can be selected from the following compounds. (1) Aliphatic, alicyclic, and aromatic acrylate compounds of 1 to 6 valent alcohols and polyalkylene glycols (2) Aliphatic, alicyclic, and aromatic 1 to 6 valent alcohols Acrylate compounds obtained by adding alkylene oxide to

(3) Polyacryloyl alkyl phosphates (4) Reaction product of carboxylic acid, polyol and acrylic acid (5) Reaction product of isocyanate, polyol and acrylic acid (6) Epoxy Reaction product of compound and acrylic acid (7) Reaction product of epoxy compound, polyol and acrylic acid

More specifically, as electron beam-curable unsaturated organic compounds, polyoxyethylene epichlorohydrin-modified bisphenol A diacrylate, dicyclohexyl acrylate, epichlorohydrin-modified polyethylene glycol diacrylate, 1,6-hexanediol diacrylate, hydroxy Vivalic acid ester neopentyl glycol diacrylate, nonylphenoxy polyethylene glycol acrylate, ethylene oxide-modified phenoxylated phosphoric acid acrylate, ethylene oxide-modified phthalic acid acrylate, polybutadiene acrylate, caprolactan-modified tetrahydrofurfuryl acrylate, tris (acryloxyethyl) isocyanurate , Trimethylolpropane triacrylate, Pentaery Litol triacrylate, pentaerythritol tetraacrylate, dipentaerythritol hexaacrylate, polyethylene glycol diacrylate, 1,4-butadienediol diacrylate, neopentyl glycol diacrylate, and neopentyl glycol-modified trimethylolpropane diacrylate. Can be done.

In the present invention, the resin coating layer may contain a white pigment for the purpose of improving sharpness.
As such a white pigment, titanium dioxide (anatase type and rutile type) is mainly used. In addition, barium sulfate, calcium carbonate, aluminum oxide, zinc oxide, magnesium oxide, magnesium hydroxide, etc. Both can be used.

The content of the white pigment is preferably 20 to 80% by weight based on the total solid weight of the resin coating layer. If the content is less than 20% by weight, the sharpness of the photographic image on the obtained photographic paper may be insufficient, and if it exceeds 80% by weight, the flexibility of the obtained resin coating layer is reduced, and film cracking is caused. May occur.

To disperse the white pigment in the above-mentioned electron beam-curable unsaturated organic compound, a three-roll mill (three-roll mill), a two-roll mill (two-roll mill),
Cowles dissolvers, homomixers, sand grinders, planetary mixers, ultrasonic dispersers and the like can be used.

Examples of the method of applying the electron beam-curable resin composition to the surface of the sheet-like support include a bar coating method, an air doctor coating method, a blade coating method, a squeeze coating method, an air knife coating method, a roll coating method, and the like. Either a gravure coating method or a transfer coating method may be used. Further, for this purpose, a fountain coater or a slit die coater method can be used.

In the present invention, the solid content weight of the electron beam-curable resin coating layer is preferably ² to 60 g / m ² . Further, the resin coating layer may have a single-layer structure or a laminated structure of two or more layers.

In the present invention, the film-forming synthetic resin used for forming the backside resin coating layer may be a polyolefin resin used for the structure of a conventional photographic printing paper support, or the above-mentioned electron beam-curable resin. Etc. can be used. Polyolefin resins for forming the backside resin coating layer include ethylene, α-olefins,
For example, it can be selected from a homopolymer such as propylene, at least two types of copolymers of the olefins, and a mixture of at least two types of these various polymers.
Particularly preferred polyolefin resins are low density polyethylene, high density polyethylene, linear low density polyethylene,
And mixtures thereof. Although the molecular weight of the polyolefin resin is not particularly limited, it is usually 20,000 to 20.
Those having a range of 000 are used. If necessary, a small amount of an antioxidant and a lubricant may be added to such a polyolefin resin. In order to form a back resin coating layer using a polyolefin resin, ordinary melt extrusion coating can be used.

As the electron beam-curable unsaturated organic compound used for forming the backside resin coating layer, all the compounds used for forming the above-mentioned resin coating layer can be used. Further, the method of forming the back surface resin coating layer is the same as that of the above-described resin coating layer. No particular restrictions on the weight of the back surface resin coating layer, but generally is preferably in the range of 10 to 40 g / m ^2. The back surface resin coating layer is provided for the purpose of preventing the penetration of the developing solution into the support during the development, and preventing the resin coating layer from being twisted or curled due to shrinkage during the electron beam irradiation.

As the electron beam accelerator used for electron beam irradiation, any of a Van de Graaf scanning system, a double scanning system, and a curtain beam system can be used, but a curtain beam system which is relatively inexpensive and has a large output can be used. Used effectively. The acceleration voltage during electron beam irradiation is preferably 100 to 300 kV, and the absorbed dose is preferably 0.1 to 6 Mrad,
0.2-4.0 Mrad is particularly preferred.

The oxygen concentration in the atmosphere at the time of electron beam irradiation is preferably 1000 ppm or less, more preferably 50 ppm or less.
Adjust to 0 ppm or less. When the oxygen concentration is 1000 ppm or more, the polymerization of the resin composition is inhibited by the presence of oxygen, and the curing may be insufficient. However, for the purpose of suppressing the generation of ozone due to electron beam irradiation, or for the purpose of cooling a window that generates heat when the electron beam passes, there is no problem in using an inert gas to lower the oxygen concentration. . In addition, the type of coexisting gas and its concentration,
The temperature and humidity of the atmosphere are not particularly limited, and coexist with an inert gas such as nitrogen.

The sheet-like substrate used in the present invention usually has a weight of 50 to 300 g / m ² , and a base paper having a smooth surface is used. Any paper substrate can be used as long as it is generally used for a sheet-like substrate. As a natural pulp for forming a paper substrate, generally, a pulp mainly containing a softwood pulp, a hardwood pulp, a softwood pulp mixed pulp, or the like is widely used.

The paper substrate may contain additives generally used in papermaking, such as sizing agents, fixing agents, paper strength agents, fillers, antistatic agents, pH regulators, pigments, dyes, and the like. Good. Further, a surface sizing agent, a surface strength agent, an antistatic agent, and the like may be appropriately applied to the surface of the paper substrate. Further, a magnesium compound can be contained in the paper substrate for the purpose of preventing fogging that occurs during long-term storage when formed into a resin-coated sheet.

Further, it is absolutely possible to use a plastic film or so-called synthetic paper as a sheet-like base material. For example, a thermoplastic resin composition containing a polyolefin resin such as a polypropylene resin or a polyethylene resin, formed into a film by a melt extrusion method,
This film can also be used as a sheet-like substrate. Further, pigments (clay, clay, etc.) are used for plastic films and so-called synthetic papers used as sheet-like substrates.
One or more of talc, kaolin, calcium carbonate, titanium dioxide, magnesium hydroxide, and the like, a dispersant (metal soap such as zinc stearate, various surfactants, and the like), and a colored pigment may be contained.

[0036]

EXAMPLES The following examples further illustrate the structure and effects of the present invention, but the present invention is not limited to these embodiments.

Example 1 A surface of a paper substrate having a basis weight of 180 g / m ² was subjected to surface activation treatment by corona discharge, followed by extrusion coating with a polyethylene resin, and back lamination at a coating amount of 30 g / m ² . Layers were provided. Then, a 25% solution of a polyurethane resin emulsion (trade name: Izelux S-4040N, manufactured by Hodogaya Chemical Industry Co., Ltd.) was dried on a surface of the paper substrate on which the above-mentioned back laminate layer was not provided using a wire bar, and then dried. Was applied so as to have a coating amount of 3 g / m ^{2, and} was heated and dried at 100 ° C. for 2 minutes to form an intermediate layer.

Next, the following electron beam-curable resin composition was
After mixing and dispersing for 1 hour with a paint conditioner, the mixture was applied onto the above-mentioned intermediate layer using a wire bar so that the applied amount after curing became 20 g / m ^2. To acceleration voltage: 175 kV
Then, an electron beam was irradiated and cured under the conditions of an absorbed dose of 2 Mrad to form a resin coating layer, thereby producing an electron beam cured resin-coated sheet.

The electron beam-curable resin composition Ingredient Blend weight urethane acrylate oligomer 36 parts by weight (trademark: Beam Set 550B, manufactured by Arakawa Chemical Industries) bifunctional acrylate monomer 24 parts by weight (trademark: M-220, manufactured by Toagosei 40 parts by weight of titanium dioxide (trademark: A220, manufactured by Ishihara Sangyo)

Evaluation of the adhesiveness of the obtained electron beam cured resin-coated sheet was performed by attaching a cellophane tape to the surface of the resin coating layer of the test resin-coated sheet and peeling it off. When the resin coating layer was completely peeled off, the evaluation was evaluated in three steps: x, when the resin coating layer was partially peeled off, and when the resin coating layer was not peeled off, the evaluation was evaluated as ○.

The evaluation of the penetration of the electron beam-curable resin into the sheet-like substrate was performed as follows. That is, when the electron beam-curable resin penetrates into the sheet-like substrate, the opacity of the sheet-like substrate decreases.
Measured by P-8138 "Paper opacity test method"
evaluated.

The evaluation of the breaking of the resin coating layer following the breaking of the sheet-like substrate of the electron beam-cured resin-coated sheet was performed by moving the test resin-coated sheet in the machine direction (the flow direction of the paper substrate during papermaking). The sample was sampled and evaluated for its flexibility when wound around a circular tube of 1 mm in diameter. When the surface of the resin coating layer was completely cracked, it was evaluated as a three-point scale. Table 1 shows the evaluation results of each item.

Example 2 An electron beam-curable resin-coated sheet was produced in the same manner as in Example 1. However, the intermediate layer was formed such that the coating amount after drying was 2 g / m ² . Table 1 shows the results of tests performed in the same manner as in Example 1.

Example 3 An electron beam-curable resin-coated sheet was produced in the same manner as in Example 1. However, the intermediate layer was formed such that the coating amount after drying was 1 g / m ² . Table 1 shows the results of tests performed in the same manner as in Example 1.

Example 4 An electron beam-curable resin-coated sheet was produced in the same manner as in Example 1. However, the following coating composition 1 for forming an intermediate layer was prepared by mixing and dispersing with a Cowles dissolver for 15 minutes, and then applied so that the coating amount after drying was 0.3 g / m ² to form an intermediate layer. Formed. Table 1 shows the results of tests performed in the same manner as in Example 1.

The intermediate layer forming coating composition 1 Ingredients Blend weight polyurethane resin emulsion (25% solution) 70 parts by weight (trademark: Aizerakkusu S-4040N, Hodogaya Chemical Co., Ltd.) Titanium dioxide 30 parts by weight (trademark: A -220, manufactured by Ishihara Sangyo)

Example 5 An electron beam-curable resin-coated sheet was produced in the same manner as in Example 1. However, acrylic resin emulsion (trademark: AE
-816, manufactured by Nippon Synthetic Rubber Co., Ltd.) to form an intermediate layer so that the coating amount after drying was 2 g / m ² . Table 1 shows the results of tests performed in the same manner as in Example 1.

Example 6 An electron beam-curable resin-coated sheet was produced in the same manner as in Example 1. However, an intermediate layer was formed by applying a 25% aqueous solution of an ethylene-acrylic acid copolymer alkali salt (trade name: Seixen, manufactured by Sumitomo Seika Co., Ltd.) so that the coating amount after drying was 2 g / m ² . . Table 1 shows the results of tests performed in the same manner as in Example 1.

Example 7 An electron beam-curable resin-coated sheet was produced in the same manner as in Example 1. However, a 25% aqueous solution of a vinyl acetate-ethylene copolymer emulsion (trade name: S-400, manufactured by Sumitomo Chemical Co., Ltd.) was applied so that the coating amount after drying was 2 g / m ² to form an intermediate layer. . Table 1 shows the results of tests performed in the same manner as in Example 1.

Example 8 An electron beam-curable resin-coated sheet was produced in the same manner as in Example 1. However, the following coating composition 2 for forming an intermediate layer was prepared by mixing and dispersing with a Cowles dissolver for 15 minutes, and then applied such that the coating amount after drying was 2 g / m ² to form an intermediate layer. . Table 1 shows the results of tests performed in the same manner as in Example 1.

The intermediate layer forming coating composition 2 Ingredients Blend weight polyurethane resin emulsion (25% solution) 60 parts by weight (trademark: Aizerakkusu S-4040N, Hodogaya Chemical Co., Ltd.) Acrylic Emulsion (30% solution) 40 parts by weight Part (trademark: AE-816, manufactured by Nippon Synthetic Rubber)

Example 9 An electron beam curable resin-coated sheet was produced in the same manner as in Example 1. However, an intermediate layer was formed by applying a 25% aqueous solution of a water-soluble polyurethane resin (trade name: Elastron BN-5, manufactured by Daiichi Kogyo Seiyaku) so that the coating amount after drying was 2 g / m ² . Table 1 shows the results of tests performed in the same manner as in Example 1.

Comparative Example 1 An electron beam curable resin-coated sheet was produced in the same manner as in Example 1. However, no intermediate layer was formed. Table 1 shows the results of tests performed in the same manner as in Example 1.

Comparative Example 2 An electron beam cured resin-coated sheet was produced in the same manner as in Example 1. However, acetoacetyl group-modified polyvinyl alcohol (trademark: Z-100, manufactured by Nippon Synthetic Chemical Industry Co., Ltd.)
An intermediate layer was formed by applying a 2% aqueous solution so that the coating amount after drying was 2 g / m ² . Table 1 shows the results of tests performed in the same manner as in Example 1.

Comparative Example 3 An electron beam curable resin-coated sheet was produced in the same manner as in Example 1. However, an intermediate layer was formed by applying a 10% aqueous solution of gelatin (trade name: P-100, manufactured by Miyagi Kagaku) so that the coating amount after drying was 2 g / m ² . Table 1 shows the results of tests performed in the same manner as in Example 1.

Comparative Example 4 An electron beam curable resin-coated sheet was produced in the same manner as in Example 1. However, an intermediate layer was formed by applying a 20% aqueous solution of vinyl acetate emulsion (trade name: Movinyl DC, manufactured by Hoechst Gosei Co., Ltd.) so that the coating amount after drying was 2 g / m ² . Table 1 shows the results of tests performed in the same manner as in Example 1.

[0057]

[Table 1]

[0058]

The electron beam cured resin-coated sheet of the present invention is
Not only has the effect of preventing the penetration of the electron beam-curable resin into the sheet-like base material, but also has the effect of preventing the resin coating layer from breaking following the breaking of the sheet-like base material. The adhesiveness to the electron beam curable resin coating layer is improved, and is extremely effective in practical use.

Claims (1)

[Claims] 1. A sheet-shaped substrate, at least one intermediate layer formed on at least one surface of the sheet-shaped substrate, and a resin formed on the intermediate layer and cured by electron beam irradiation A resin coating layer comprising an electron beam cured product, wherein the intermediate layer is selected from acrylic resin, urethane resin, ethylene-acrylic acid copolymer alkali salt, vinyl acetate-ethylene copolymer and water-soluble polyurethane resin. An electron beam-curable resin-coated sheet excluding a photographic printing paper support, wherein the sheet is formed from a resin composition containing at least one type of resin obtained.