JPH09195198A - Intense-luster printing sheet - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a printing sheet excellent in printing ink settability by providing the surface of a sheet-like base material with an electron beam-cured resin coating layer and thereon an overcoating layer consisting mainly of an ethylene-based copolymer. SOLUTION: The surface of a polyester film is coated with a coating composition predominant in an unsaturated organic compound such as a bifunctional polyurethane acrylate oligomer curable by electron beam irradiation to form the outermost side coating liquid layer. While, the cast coating layer of cast- coated paper as sheet-like base material is coated with a coating composition similar to that mentioned above followed by laminating the coating composition with the outermost side coating liquid layer on the polyester film, and then electron beams are irradiated through the backside of the film to effect curing the coating composition followed by peeling off the polyester film, and the resultant surface of the electron beam-cured resin-coated sheet is provided with an overcoating layer predominant in an ethylene-based copolymer selected from among ethylene-vinyl acetate copolymer, ethylene-(meth)acrylic acid (alkali salt) copolymer and ethylene-(meth)acrylic ester copolymer.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a sheet for high-gloss printing, and in particular, a sheet for high-gloss printing which is obtained by coating an electron beam curable resin coating layer with an overcoat layer and is excellent in setting property of printing ink. Regarding

[0002]

2. Description of the Related Art Conventionally, gloss coated paper called cast coated paper has a coating layer containing a pigment and an adhesive as main components.
While it is in a plastic state containing water, it has a high-gloss coating layer formed by being pressed against a heated mirror surface and dry-finished. It is not satisfactory, and a higher gloss is desired.

In order to solve this problem, molten resin is laminated on a sheet-like substrate in the form of a film, which is pressed against a smooth and highly glossy metallic cylindrical rotary member to cool it, and after cooling, it is made of metal. A so-called laminated coating method for forming a high-gloss coating layer by peeling from a cylindrical rotating body, or an unsaturated organic compound which can be cured by electron beam irradiation as a main component instead of the molten resin of the above-mentioned laminated coating method A cast electron beam in which a coating liquid layer formed from a coating composition (hereinafter referred to as an electron beam curable resin composition) is brought into pressure contact with a molding surface or a metal cylindrical rotating body and is irradiated with an electron beam to cure the same. Irradiation methods have been used, and these methods have made it possible to obtain printing sheets having high gloss.

However, when these electron beam curable resin coating layers were used for printing, their printability, particularly the setting property of printing ink, was poor, and a satisfactory product as a printing sheet could not be obtained yet.

[0005]

SUMMARY OF THE INVENTION The present invention is intended to solve the above-mentioned problems of the prior art and to provide a strong gloss printing sheet which is excellent in printability, particularly ink setting property.

[0006]

Means for Solving the Problems As a result of earnest research, the inventors of the present invention have found that as a means for solving the above-mentioned problems, an ethylene-based copolymer is used as a main component on the outermost electron beam curing resin coating layer. It was found that a sheet for strong gloss printing can be obtained by providing the overcoat layer having the above-mentioned, and the present invention has been completed.

That is, the strong gloss printing sheet according to the present invention is an electron beam curable resin comprising a sheet-like support and a cured product formed by irradiating an electron beam of the electron beam curable resin composition on at least one surface thereof. At least one coating layer is provided, and an overcoat layer containing an ethylene-based copolymer as a main component is provided on the surface of the electron beam curable resin coating layer.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION The ethylene-based copolymer used in the overcoat layer used in the present invention is not limited to a monomer, an oligomer, a molecular weight, a copolymerization composition ratio, etc. as long as it contains an ethylene skeleton. .

Specifically, the ethylene-based copolymer is
Ethylene-vinyl acetate copolymer, ethylene-acrylic acid copolymer, ethylene-acrylic acid alkali salt copolymer such as sodium salt and ammonium salt, ethylene-acrylic acid ester copolymer, ethylene-methacrylic acid copolymer, It is at least one selected from ethylene-methacrylic acid alkali salt copolymers such as sodium salts and ammonium salts, and ethylene-methacrylic acid ester copolymers.

Since the ethylene-based copolymer used in the present invention usually has a high viscosity, it may be diluted with a solvent to reduce the viscosity. Any solvent may be used as long as it can dissolve the ethylene copolymer, and known solvents such as water, acetone, methyl ethyl ketone, methanol, ethanol, toluene, xylene, methyl acetate, ethyl acetate can be used.

The coating amount of the overcoat layer used in the present invention is preferably 0.1 to 5 g / m ² after drying, more preferably 0.5 to 3 g / m ² . If this coating amount is less than 0.1 g / m ² , the ink settability will be insufficient. If it exceeds 5 g / m ² , the effect may be saturated and the cost may increase.

The electron beam-curable unsaturated organic compound forming the electron beam-curable resin coating layer used in the present invention is not particularly limited to its kind, and the following compounds can be exemplified. You may mix these 2 or more types.

(1) 1 to 1 of aliphatic, alicyclic and aromatic
Acrylate compounds of hexavalent alcohol and polyalkylene glycol. (2) Acrylate compounds obtained by adding a polyalkylene oxide to an aliphatic, alicyclic or aromatic monohydric alcohol. (3) Polyacryloyl alkyl phosphates. (4) Reaction product of polybasic acid, polyol, and acrylic acid. (5) Reaction product of isocyanate, polyol and acrylic acid. (6) A reaction product of an epoxy compound and acrylic acid. (7) A reaction product of an epoxy compound, a polyol, and acrylic acid. And the like.

Specifically, as the electron beam curable monofunctional unsaturated organic compound, methyl acrylate, ethyl acrylate, lauryl acrylate, stearyl acrylate, N-vinylpyrrolidone, acryloylmorpholine, 2-ethylhexyl acrylate, 2-hydroxy are used. Ethyl acrylate, 2-hydroxyethyl methacrylate, 2-hydroxypropyl acrylate, 2-
Hydroxypropyl methacrylate, 2-hydroxybutyl acrylate, 2-hydroxybutyl methacrylate,
Tetrahydrofurfuryl acrylate, tetrahydrofurfuryl methacrylate, caprolactone modified tetrahydrofurfuryl acrylate, cyclohexyl acrylate, cyclohexyl methacrylate, dicyclohexyl acrylate, isobornyl acrylate, isobornyl methacrylate, benzyl acrylate, benzyl methacrylate, ethoxydiethylene glycol acrylate, methoxytriethylene glycol Acrylate, methoxy propylene glycol acrylate, phenoxy polyethylene glycol acrylate, phenoxy polypropylene glycol acrylate, nonyl phenoxy polyethylene glycol acrylate, ethylene oxide modified phenoxy acrylate, nonyl phenoxy polypropylene acrylate Cole acrylate, N, N-dimethylaminoethyl acrylate, N, N-dimethylaminoethyl methacrylate, 2-ethylhexyl carbitol acrylate, ω-carboxypolycaprolactone monoacrylate, phthalic acid monohydroxyethyl acrylate, acrylic acid dimer, 2-hydroxy -3
-Phenoxypropyl acrylate, acrylic acid-9,
10-epoxidized oleyl, methacrylic acid-9,10-
Epoxidized oleyl, ethylene glycol monoacrylate maleate, dicyclopentenyl acrylate, dicyclopentanyl acrylate, dicyclopentenyloxyethylene acrylate, 4,4-dimethyl-1,3
-Acrylate of a caprolactone adduct of dioxolane, acrylate of a caprolactone adduct of 3-methyl-5,5-dimethyl-1,3-dioxolane, polybutadiene acrylate, ethylene oxide-modified phenoxylated phosphoric acid acrylate and the like are used. Further, as the electron beam curable polyfunctional unsaturated organic compound, ethanediol diacrylate, ethanediol dimethacrylate, 1,
3-propanediol diacrylate, 1,3-propanediol dimethacrylate, 1,4-butanediol diacrylate, 1,4-butanediol dimethacrylate, 1,6-hexanediol diacrylate, 1,
6-hexanediol dimethacrylate, 1,9-nonanediol diacrylate, 1,9-nonanediol dimethacrylate, 1,14-tetradecanediol diacrylate, 1,15-pentadecanediol diacrylate, diethylene glycol diacrylate, polyethylene glycol di Acrylate, polyethylene glycol dimethacrylate, polypropylene glycol diacrylate, polypropylene glycol dimethacrylate, neopentyl glycol diacrylate, 2-butyl-2-ethylpropanediol diacrylate, ethylene oxide modified bisphenol A diacrylate, polyethylene oxide modified bisphenol A diacrylate, Polyethylene oxide modified hydrogenated bisphenol A diacrylate, Propylene oxide-modified bisphenol A diacrylate, polypropylene oxide-modified bisphenol A diacrylate, hydroxypivalic acid ester neopentyl glycol ester diacrylate,
Hydroxypivalic acid ester Neopentyl glycol ester caprolactone adduct diacrylate, ethylene oxide modified isocyanuric acid diacrylate, pentaerythritol diacrylate monostearate,
1,6-hexanediol diglycidyl ether acrylic acid adduct, polyoxyethylene epichlorohydrin-modified bisphenol A diacrylate, tricyclodecane dimethanol diacrylate, trimethylolpropane triacrylate, ethylene oxide-modified trimethylolupane triacrylate, Polyethylene oxide modified trimethylol pupane triacrylate, propylene oxide modified trimethylol pupane triacrylate, polypropylene oxide modified trimethylol pupane triacrylate, pentaerythritol triacrylate,
Ethylene oxide modified isocyanuric acid triacrylate, ethylene oxide modified glycerol triacrylate, polyethylene oxide modified glycerol triacrylate, propylene oxide modified glycerol triacrylate, polypropylene oxide modified glycerol triacrylate, pentaerythritol tetraacrylate, ditrimethylolpropane tetraacrylate,
Dipentaerythritol tetraacrylate, dipentaerythritol pentaacrylate, dipentaerythritol hexaacrylate, caprolactone modified dipentaerythritol hexaacrylate, polycaprolactone modified dipentaerythritol hexaacrylate and the like are used.

In order to enhance the surface smoothness and the glossiness of the strong gloss printing sheet of the present invention, it is preferable to produce the electron beam curable resin coating layer by a casting method, and to improve the whiteness and the like. For this purpose, it is preferable to add a pigment to the electron beam curable resin composition. When a paper base is used as the sheet-shaped support, the electron beam curable resin coating layer has a laminated structure of two or more layers, that is, the inner resin coating layer is an electron beam curable resin containing no pigment. An electron beam curable resin composition (hereinafter, pigment-containing) formed from a cured product of a composition (hereinafter, referred to as a clear electron beam curable resin composition) by electron beam irradiation, and an outermost resin coating layer containing a pigment. It is preferable to form a cured product of an electron beam curable resin composition) by electron beam irradiation and use a casting method for forming these.

In the pigment-containing electron beam curable resin composition used in the outermost resin coating layer (when the electron beam curable resin coating layer is a single layer), the pigment used is not particularly limited. Known as clay, kaolin, talc, magnesium hydroxide, aluminum hydroxide, heavy calcium carbonate, light calcium carbonate, titanium dioxide (anatase type and rutile type), zinc oxide, barium sulfate and other inorganic pigments, and plastic pigments Organic pigments such as known polystyrenes can be used. These pigments are usually white and may be used as they are without surface treatment, but those surface-treated with siloxane, alumina, alcohol, silane coupling agent and the like may be used. Further, the pigment may be composed of a single kind, or two or more kinds may be mixed and used. Further, a known auxiliary agent such as a dispersant, a release agent, an antifoaming agent, a colorant, a dye, an antiseptic agent is added to the electron beam curable resin composition containing such a pigment, if necessary. You can also

The amount of the pigment blended is preferably 10 to 80 parts by weight based on the entire electron beam curable resin composition,
More preferably, it is 20 to 60 parts by weight. When the amount of the pigment is less than 10 parts by weight, the hiding property of the pigment may be poor, and when it is more than 80 parts by weight, the viscosity of the paint may be excessively high and the fluidity may be poor. .

To disperse the white pigment in the electron beam-curable unsaturated organic compound, a three-roll mill (three-roll mill), a two-roll mill (two-roll mill), a cowles dissolver, a homomixer, a sand grinder, A planetary mixer, an ultrasonic disperser or the like can be used.

The electron beam-curable unsaturated organic compound used for forming the inner resin coating layer is not particularly limited, but is similar in order to impart adhesiveness to the inner resin coating layer and the outermost resin coating layer. An electron beam curable unsaturated organic compound having the above-mentioned molecular structure is preferably used.

The type of the sheet-like support used in the present invention is not particularly limited, and paper (for example, high-quality paper), plastic film, cloth, non-woven fabric, or aluminum foil having a relatively thin thickness is used. However, a paper substrate is preferably used. The paper base is usually 50 to
A paper substrate having a smooth surface with a weight of 300 g / m ² is used. The type of paper substrate used in the present invention is not particularly limited. As the pulp forming the paper substrate, there are generally softwood pulp, maple, beech,
Widely used are those containing natural pulp such as hardwood pulp produced from poplar and the like, mixed pulp of hardwood and hardwood as the main component, and bleached pulp such as kraft pulp, sulfite pulp and soda pulp. Further, a paper substrate manufactured from pulp containing synthetic fibers or synthetic pulp can also be used. The paper substrate may contain one or more of various conventional additives such as a dry paper strengthening agent, a sizing agent, a filler, a wet paper strength enhancing agent, a fixing agent and a pH adjusting agent.

Further, in place of the paper base used in the present invention, it is no problem to use a sheet-like support such as a plastic film or so-called synthetic paper.
For example, a film formed by a melt extrusion method of a thermoplastic resin composition containing a polyolefin resin such as polypropylene resin or polyethylene resin can be used as a sheet-shaped support. Further, so-called synthetic paper obtained by converting a synthetic resin film into a pseudo paper can also be used as the sheet-shaped support. The plastic film used as a sheet-shaped support and so-called synthetic paper include clay, talc,
1 such as pigments such as kaolin, calcium carbonate, titanium dioxide, magnesium hydroxide, dispersants such as metal soaps such as zinc stearate and various surfactants, and colored pigments
More than one type may be included.

The method for producing the electron beam curable resin coating layer of the sheet for strong gloss printing according to the present invention is as follows. The clear electron beam curable resin composition is applied onto one surface of the sheet-like support to form an inner coating liquid layer. And separately coating the pigment-containing electron beam curable resin composition on the surface of the molded body to form the outermost coating liquid layer, and supporting the sheet-shaped support on the outermost coating liquid layer on the surface of the molded body. The inner coating liquid layers on the body are superposed, and the multilayer body formed thereby is irradiated with an electron beam to adhere and cure the inner resin coating layer and the outer resin coating layer to each other, and to interpose the inner resin coating layer. It is possible to join the sheet-like support and the outermost resin coating layer to form a laminated body, and peel the laminated body from the surface of the molded body.

As another method for producing a strong gloss printing sheet according to the present invention, a clear electron beam curable resin composition is applied onto the surface of a sheet-like support to form an inner coating liquid layer, Separately, on the surface of the molded body, the pigment-containing electron beam curable resin composition is applied to form the outermost coating liquid layer, and the surface of the molded body is irradiated with an electron beam to be cured,
An outermost resin coating layer is formed, the innermost coating liquid layer on the sheet-shaped support is superposed on the outermost resin coating layer on the surface of the molded body, and the multilayer body formed thereby is irradiated with an electron beam. Then, the inner coating liquid layer and the outermost resin coating layer are adhered and cured to each other, and the sheet-like support and the outermost resin coating layer are bonded to each other through the inner resin coating layer to form a multilayer body. There is a method of peeling the body from the surface of the molded body.

The metal cylindrical rotary body used as the molded body used in the above-mentioned manufacturing method is not particularly limited in its material shape, and is made of, for example, stainless steel, copper, chrome, etc., and has a mirror-finished smooth surface. Those having various peripheral surfaces are used. Further, in order to facilitate the peeling between the outermost resin coating layer and the surface of the molded body, a peeling aid such as silicone oil or wax can be supplied to the surface of the metal cylindrical rotary body.

The sheet material for molding used as a molded body is not particularly limited as long as it is smooth and flexible. Specifically, it is a plastic film such as a polyester film, a metal sheet or a resin coated paper. , Metal-deposited film, metal-deposited paper, etc. are preferable, and a release aid such as silicone or wax may be supplied to the surface of the sheet material for molding in order to facilitate the release of the outermost resin coating layer. . Furthermore, the surface of the sheet-shaped material is appropriately treated in advance,
For example, a treatment such as a silicone treatment may be performed to facilitate peeling of the cured outermost resin coating layer. The sheet-shaped material used as the molded body may be processed into an endless belt shape. The sheet-shaped material used as a molded body can be used repeatedly, but since repeated impacts of electron beam irradiation deteriorate the sheet-shaped material,
There is a limit to the number of times this can be used repeatedly.

A method for coating the surface of a metallic cylindrical rotary member or the surface of a sheet-like support with an electron beam curable resin composition, or for coating an outermost resin coating layer with an overcoat layer forming resin composition. Examples of the method include bar coating, air doctor coating, blade coating, squeeze coating, air knife coating, roll coating, gravure coating, transfer coating, comma coating, smoothing coating, and micro coating. A gravure coating method, a reverse roll coating method, a multi-roll coating method, a dip coating method, a kiss coating method, a gate roll coating method, a drop curtain coating method, a slide coating method, a fountain coating method, a slit die coating method and the like can be used. Especially when using a metal cylindrical rotary body as a molded body, use a roll coating method using a rubber roll for coating or an offset gravure coating method so as not to scratch the surface of the metal cylindrical rotary body. Further, a non-contact type fountain coater, a slit die coater, or the like is advantageously used.

In the strong gloss printing sheet of the present invention, the total coating amount of the electron beam curable resin coating layer comprising the inner resin coating layer and the outermost resin coating layer is 3 to 60 g / cured after curing.
m ² is preferable, and more preferably 5 to 40 g.
/ M ² . If this coating amount is less than 3 g / m ² , the smoothness of the obtained coated body will be insufficient, and cosmetic properties cannot be obtained.
The glossiness may decrease. Also, it is 60g / m
^If it exceeds ² , the effect may be saturated and the cost may increase.

In order to provide the outermost resin coating layer with beauty, the coating amount after curing is preferably 0.1 g / m ² or more, more preferably 0.3 to 20 g / m ² . is there. When the coating amount of the outermost resin coating layer is less than 0.1 g / m ² , the hiding property may be insufficient even if the blending amount of the pigment is large. Further, in order to ensure the function of the inner resin coating layer, the coating amount after curing is preferably 3 g / m ² or more, more preferably 5 to 20 g / m ² . If the coating amount of the inner resin coating is less than 3 g / m ² , the formation unevenness of the paper substrate cannot be completely filled.

In the present invention, smoothness is improved,
An undercoat layer containing a synthetic resin as a main component between the sheet-shaped support and the electron beam-curable resin coating layer in contact with the sheet-shaped support in order to improve the adhesion between the sheet-shaped support and the electron-beam cured resin coating layer in contact with the sheet-shaped support. There is no problem even if it is provided.
Examples of the synthetic resin used for the undercoat layer include alkyd resins, (meth) acrylic resins, vinyl resins, cellulose resins, urethane resins, polyester resins, and copolymer resins thereof. ,
It is applied after being dissolved or dispersed in a solvent-based or aqueous medium. An electron beam curable resin or an ultraviolet curable resin can also be used for forming the undercoat layer. Providing such an undercoat layer is a means generally used in the field of forming a resin coating layer by coating an electron beam curable resin composition on a sheet-like support, and for example, electron beam curing It is used as a support for photographic printing paper coated with a functional resin composition, a transfer paper for electrophotography, a base paper for heat-sensitive use, a release paper for processes, a thermal transfer receiving paper, an inkjet recording paper, a wrapping paper and the like.

The electron beam irradiation apparatus used for the electron beam irradiation is not particularly limited in its system, but for example, a Handegraaf type scanning system, a table scanning system,
An electron beam irradiation device such as a broad beam system and a curtain beam system can be used. Among these, the curtain beam system, which is relatively inexpensive and can obtain a large output, is effectively used in the present invention.

The acceleration voltage during electron beam irradiation is 100 to 30.
The absorbed dose is preferably 0.
It is preferably 1 to 8 Mrad, and 0.5 to 5 Mr.
ad is particularly preferred.

[0032]

EXAMPLES The present invention will be described in more detail below with reference to examples, but the present invention is not limited to these.

Example 1 A strong gloss printing sheet was prepared by the following procedure . Composition 1 (the outermost resin coating layer forming) Ingredient weight difunctional polyurethane acrylate oligomer electron beam-curable organic compound to 70 parts by weight containing as a main component (TM: OI-13, Arakawa Chemical Industries, Ltd.) Titanium dioxide (Trademark: R-23, manufactured by Sakai Chemical Industry) 30 parts by weight

[0034] Composition 2 (inner resin coating layer forming) Ingredient weight difunctional polyurethane acrylate oligomer electron beam-curable organic compound to 100 parts by weight containing as a main component (TM: OI-13, manufactured by Arakawa Chemical Industries)

[0035] Composition 3 (for overcoating) Ingredient weight ethylene - toluene solvent diluted to 100 parts by weight of the resin mainly composed of vinyl acetate copolymer (Trademark: PS-13, manufactured by Nippon Kako Paint)

Preparation of sheet for high-gloss printing The composition 1 was used as a molded body in a thickness of 75 μm.
On the surface of the polyester film of No. 5, using a Mayer bar, the coating amount after curing becomes 5 g / m ² ,
The outermost coating liquid layer was formed. Next, basis weight 128 g / m ²
Of the cast coated paper (trademark: Mirror Coat Gold, manufactured by Shin Oji Paper Co., Ltd.) is used as a sheet-like support, and the composition 2 is coated on the surface of the cast coated layer using a Mayer bar to give a coating amount after curing. After coating so as to be 10 g / m ² , the outermost coating liquid layer on the surface of the polyester film having a thickness of 75 μm is superposed thereon, and then this multi-layer body is
Acceleration voltage 175kV from the back of the polyester film,
The compositions 1 and 2 are cured by irradiating them with an electron beam under the conditions of an absorbed dose of 3 Mrad and an oxygen concentration of 500 ppm or less, and at the same time, the obtained inner resin coating layer, outermost resin coating layer and sheet-like support are integrally bonded. It was Then, the polyester film was peeled off from the outermost resin coating layer to obtain an electron beam cured resin coated sheet. Next, the composition 3 was applied onto the surface of the electron beam-curable resin-coated sheet using a Meyer bar so that the coating amount after drying was 1.0 g / m ² , and dried with a dryer. A sheet for strong gloss printing was obtained.

Test and Evaluation Method (1) Measurement of white paper glossiness The white paper glossiness is 60 ° / 6 according to JIS-Z8741 using a gloss meter VGS-1D (manufactured by Nippon Denshoku Industries Co., Ltd.).
The 0 degree glossiness was measured. Those having a measured value of 75% or more are judged to have excellent gloss.

(2) Printability test (ink setting property) A test printing sheet was printed under the following conditions using a RI printing tester (RI-1 type, manufactured by Ishikawajima Kikai Sangyo). Ink type: DIC FINE I
NK F-Gloss N-Type) Ink amount: 0.5g / Full printing roll Printing speed: 30rpm Under these conditions, the printing surface is printed by rotating the spreading cylinder.
A clean rubber roll was set on the printing surface so that synthetic paper (Yupo FPG-95, made by Oji Yuka Synthetic Paper) was stacked, and the developing cylinder was moved by about 2 cm every 1 minute until 7 minutes later, Synthetic paper was lined with printing ink. The set-off density of the ink on the synthetic paper that had been lined was measured with a Macbeth reflection densitometer RD-914. The time when the measured value became 0.10 or less was represented as the ink setting completion time. An ink set completion time of 5 minutes or less is judged to be excellent in ink setting property. The evaluation results are shown in the table.

Example 2 The same operation as in Example 1 was performed. However, instead of the composition 3, the following composition 4 was prepared and used. Composition 4 (for overcoating) Ingredient weight ethylene - 100 parts by weight of water-based emulsion composed mainly of sodium salt of an acrylic acid copolymer (Trademark: Zaikthene -N, manufactured steel Chemical) Example 1 Similarly, a strong gloss printing sheet was prepared and evaluated. The evaluation results are shown in the table.

Comparative Example 1 The same operation as in Example 1 was carried out to obtain an electron beam-curable resin-coated sheet, and a sample having no overcoat layer was evaluated in the same manner as in Example 1. The evaluation results are shown in the table.

Comparative Example 2 The cast coated layer surface of a cast coated paper (trademark: Mirror Coat Gold, manufactured by Shin Oji Paper Co., Ltd.) having a basis weight of 128 g / m ² was evaluated in the same manner as in Example 1. The evaluation results are shown in the table.

Comparative Example 3 The surface of the cast coated layer of the cast coated paper having a basis weight of 128 g / m ² (trademark: crystal coat, manufactured by NIPPON PROCESSING PAPER) was evaluated in the same manner as in Example 1. The evaluation results are shown in the table.

[0043]

[Table 1]

As clearly shown in the table, the strong gloss printing sheet according to the present invention had an extremely high white paper gloss and was excellent in ink setting property (Examples 1 to 1). 2). However, when the overcoat layer of the present invention was not coated, the ink setting property of the obtained printing sheet was poor (Comparative Example 1). Further, in general cast coated paper, the glossiness of white paper is extremely low (Comparative Examples 2 and 3).

[0045]

EFFECTS OF THE INVENTION The present invention provides a sheet-like support with one or more electron beam-curable resin coating layers and an overcoat layer containing an ethylene-based copolymer as a main component to improve printability, particularly ink. It is intended to provide a sheet for strong gloss printing having an extremely high white paper gloss, which is excellent in setting properties, and is extremely effective in practical use.

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Claims (2)

[Claims] 1. An electron beam comprising a sheet-like support and a cured product obtained by electron beam irradiation of a coating composition containing as a main component an unsaturated organic compound which is formed on at least one surface thereof and is curable by electron beam irradiation. A sheet for strong gloss printing, comprising at least one cured resin coating layer, and having an overcoat layer containing an ethylene copolymer as a main component on the surface of the electron beam cured resin coating layer. . 2. The ethylene-based copolymer is ethylene-based
Vinyl acetate copolymer, ethylene-acrylic acid copolymer,
Ethylene-alkali acrylate copolymer, ethylene-
At least one selected from an acrylic acid ester copolymer, an ethylene-methacrylic acid copolymer, an ethylene-methacrylic acid alkali salt copolymer, and an ethylene-methacrylic acid ester copolymer. Sheet.