JPH08269892A - Metal vacuum-deposited paper - Google Patents

Abstract

PURPOSE: To obtain a metal vacuum-deposited paper excellent in heat resistance, smoothness and printability by disposing a metal vacuum-deposited layer on at least one surface of a paper substrate containing foamed particles through an electron beam-cured resin coating layer. CONSTITUTION: A craft pulp slurry is mixed with foamable particles such as thermally foamable particles and additives such as a paper-reinforcing agent, processed into a paper sheet and subsequently dried to form the foamed paper sheet having a density of 0.1-0.4g/cm<3> . At least one surface of the foamed paper sheet as the substrate is coated with a resin composition such as an urethane resin, vacuum-deposited with aluminum thereon and subsequently adhered to a polyester film. Electron beam is radiated from the back surface of the film to cure the resin composition. The film is subsequently peeled to obtain the metal vacuum-deposited paper sheet having an average roughness (JISB 0601) of <=0.1μm on the central line of the metal vacuum-deposited layer surface.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat insulating metal vapor-deposited paper useful as a container for storing soft drinks, frozen foods, vegetables and the like. More specifically, the present invention relates to a metal vapor-deposited paper which has excellent light and heat shielding properties, heat insulation properties, good printability, and beautiful appearance.

[0002]

2. Description of the Related Art In general, as a storage container as described above, a container made of expanded polystyrene is widely used because it is excellent in heat insulating property or heat retaining property, moldability and processability are good, and it is inexpensive. There is. However, recently, products based on these foamed polymer materials are easy to incinerate due to social trends such as recycling and environmental pollution, and biodegradation by microorganisms in soil is possible. There is a demand for a switch to a heat-insulating container mainly made of paper. In addition, in order to appeal the product in conventional containers, there are some that are printed on the outer layer of the container, but in all those that are printed directly on the container based on a foamed polymer material, the image after printing is unclear Therefore, at present, it is the current situation that a coated art paper, a plastic film, or the like, which is further printed, is attached to the heat insulating substrate.
Therefore, there has been a demand for a storage container that has excellent heat insulation, good printability, and is environmentally friendly.

As this type of container mainly composed of a paper substrate, a paper substrate alone or a laminate of a thermoplastic resin such as polyethylene on at least one surface of the paper substrate is often used. However, all of these have the drawbacks that the temperature of the contents changes rapidly due to poor heat insulation or heat retention. As a means for improving these, first, there is disclosed a method of using a paper base material that has been embossed or ribbed, or used by laminating it to another paper base material (Japanese Patent Laid-Open No. 51-2576). However, with this, it is still difficult to obtain the expected heat insulation effect, and if such processing is performed, the printability deteriorates and the appearance becomes poor. As another method, a method for forming closed cells (foam particles) in a paper substrate by adding expandable fine particles at the stage of papermaking and heating and foaming in the drying step (Japanese Patent Laid-Open No. 5-339898). However, it is still difficult to maintain the same level of heat insulation as the foamed polymer material, and printability is better than before, but it is fully satisfactory. It's hard to say a level.

Therefore, for example, paying attention to light and heat shielding properties of aluminum or the like, after providing a coating layer on a paper base material containing foam particles, aluminum is vacuum-deposited or foam particles are contained. A method (transfer method) in which a paper base material and aluminum are bonded together via a thermoplastic resin, an adhesive, or the like can be considered. With such a structure, it is possible to obtain the same heat insulating properties as a foamed polymer material, but the former is processing in a vacuum, so it is not very realistic for a bulky paper substrate. In the latter case, the residual unfoamed particles in the paper base material foam due to the heat applied to the paper base material at the time of bonding with aluminum, and the surface of the aluminum layer becomes uneven, resulting in metallic luster and printability. There is a problem of being inferior.

[0005]

DISCLOSURE OF THE INVENTION The present invention relates to a metal vapor-deposited paper having excellent heat insulating properties, a smooth surface, and good printability, that is, the object of the present invention is to contain foam particles. By providing a metal vapor deposition layer on at least one surface of the formed paper base material (hereinafter, referred to as foamed paper) via a resin coating layer cured by electron beam (hereinafter, referred to as electron beam cured resin layer), heat insulation is achieved. (EN) Provided is a metal-deposited paper which is excellent in printability, has good printability, and can be recycled.

[0006]

MEANS FOR SOLVING THE PROBLEMS The metallized paper of the present invention is
Paper base material (a) and a resin coating layer (b) formed on at least one surface of the paper base material (a) and cured by an electron beam
And a metal vapor deposition layer (c) formed through the resin coating layer
And the paper substrate (a) contains foam particles and has a density of 0.1 to 0.4 g / cm ³ . Preferably, in the metal-deposited paper of the present invention, the value of the center line average roughness (Ra) of the surface of the metal-deposited layer (c) is 0.1 μm based on JIS B-0601.
It is the following.

[0007]

The paper used as the substrate in the present invention contains foam particles and has a density of 0.1 to 0.4 g / cm.
^{It is 3} foam paper. In the above density range, it is possible to obtain an excellent heat insulating effect due to the large number of closed cells existing in the substrate. For example, in the present invention, the density is 0.18.
The thermal conductivity of foam paper with a basis weight of 150 g / m ² at g / cm ^{3 of} about 0.051 W / m / K is obtained, and heat insulation comparable to expanded polystyrene (about 0.038 W / m / K) It was recognized that The density of the above paper base material is 0.1 g
/ Cm ³ or less is not suitable because the paper strength such as tensile strength and tear strength is extremely reduced, and the density is 0.4 g /
If it is more than cm ³ , a sufficient heat insulating effect cannot be obtained. Further, the basis weight of the paper base material in the present invention varies depending on the purpose of use and cannot be generally stated, but is preferably about 50 g / m ² or more from the viewpoint of the strength of the metal vapor-deposited paper, the heat insulating property, etc. It is decided naturally based on the application and workability.

The papermaking of such foamed paper is performed by adding 1 to 40% by weight of expandable fine particles having a liquid as a core substance to a fibrous material mainly composed of pulp to prepare a wet paper paper strength agent and a dry paper strength agent. First, a wet paper is manufactured by adding a sizing agent, a filler, a pigment, etc., if necessary. After that, the moisture content of the paper is changed to a predetermined amount (65% to 72%).
%) And perform foaming at the same time as drying on a dryer machine, or dry at a temperature below the foaming temperature of the expandable fine particles, and then rehydrate the water to adjust the water content to a specified amount and then perform heat treatment. Thus, a foamed paper containing foam particles can be obtained. In any case, the temperature for drying and foaming is preferably in the range of the optimum foaming temperature of the expandable fine particles ± 30 ° C.

Examples of the pulp used in the present invention include wood pulp such as chemical pulp and mechanical pulp of softwood and hardwood, used paper pulp, non-wood natural pulp such as hemp and cotton, or polyethylene, polypropylene, etc. Examples thereof include synthetic pulp and the like, and these can be used in an appropriate combination. In addition to the above pulp, it is also possible to mix various fibers such as acrylic fibers, rayon fibers, phenol fibers, polyamide fibers, organic fibers such as polyester fibers, glass fibers, carbon fibers, inorganic fibers such as alumina fibers, and the like. . From the viewpoint of papermaking properties, it is preferable to add 50% by weight or more of the pulp to the total fiber material of the papermaking raw material, which is excellent in sheet formation and strength.

A typical example of the expandable fine particles used in the present invention is a thermally expandable microcapsule in which a low boiling point solvent is enclosed in a microcapsule. The capsules are particles having an average particle size of 10 to 30 μm, which expand by about 4 to 5 times in diameter and 50 to 100 times in volume by heating at a relatively low temperature of 80 to 200 ° C. for a short time. Thermoplastic resin consisting of a copolymer of vinylidene chloride, acrylonitrile, acrylic acid ester, methacrylic acid ester, etc. with a volatile organic solvent (expanding agent) such as isobutane, pentane, petroleum ether, hexane, low boiling point halogenated hydrocarbons, and methylsilane. When the microcapsule is heated above the softening point of the membrane polymer, the membrane polymer begins to soften, and at the same time the vapor pressure of the encapsulating expander rises, the membrane is pushed open and the capsule is expanded. Expands. The heat-expandable microcapsule expands at a relatively low temperature in a short time to form closed cells, which can provide a base material with excellent heat insulation properties.
Also, it is relatively easy to handle, so it is suitable for this application. Matsumoto Microsphere F
-30D, F-30GS, F-20D, F-50D,
F-80D (manufactured by Matsumoto Yushi-Seiyaku Co., Ltd.), Expancel WU, and DU (manufactured by Sweden, sold by Nippon Philite Co., Ltd.) are known, but are not limited to these. The compounding amount of the expandable fine particles is 1 to 40 parts by weight, preferably 3 to 100 parts by weight with respect to 100 parts by weight of pulp fiber.
It is 20 parts by weight, and if it is 1 part by weight or less, sufficient foaming cannot be obtained, and if it is 40 parts by weight or more, it is not suitable in terms of economy.

Various other anionic, nonionic, cationic or amphoteric retention aids, paper strength enhancers, sizing agents and the like are appropriately selected and used in the pulp slurry. Specifically, as a paper strength enhancer and a yield improver, polyacrylamide-based cationic, nonionic,
Anionic and amphoteric resins, polyethyleneimine and its derivatives, polyethylene oxide, polyamines,
Polyamide, polyamide polyamine and its derivatives,
Organic compounds such as cationic and amphoteric starch, oxidized starch, carboxymethylated starch, plant gum, polyvinyl alcohol, urea formalin resin, melamine formalin resin, hydrophilic polymer particles, and sulfuric acid band, alumina sol, basic aluminum sulfate, Aluminum compounds such as basic aluminum chloride and basic polyaluminum hydroxide,
Further, inorganic compounds such as ferrous sulfate, ferrous chloride or colloidal silica, bentonite are used in combination. Examples of sizing agents include rosin-based sizing agents, petroleum resin-based sizing agents for acidic papermaking, alkylketene dimer-based sizing agents, alkenyl succinic anhydride-based sizing agents, and the like for neutral papermaking.

In addition to these, various commonly known fillers can be mixed. For example, talc, kaolin, calcined kaolin, clay, diatomaceous earth, ground calcium carbonate,
Examples thereof include mineral fillers such as magnesium carbonate, aluminum hydroxide, titanium dioxide, magnesium sulfate, silica, aluminosilicate and bentonite, and organic synthetic fillers such as polystyrene particles and urea formalin resin particles. Further, a papermaking additive such as a dye, a pH adjuster, a slime control agent, a defoaming agent, and a sticky agent can be used depending on the application.

The present invention is characterized in that a metal vapor deposition layer is provided on the surface of foamed paper via a resin coating layer, and has the same heat insulation as that of a foamable polymer substrate such as polystyrene. It turned out that the sex can be obtained. Examples of the method for providing the metal vapor deposition layer include a direct vapor deposition method and a transfer method. The former is a method of vacuum-depositing metal directly on the surface of foam paper, but since the foam paper itself used is bulky, it is not very practical in that it takes a long time to reach a vacuum. The latter is a plastic film support that has been subjected to a release coating treatment, which has been subjected to metal deposition processing,
It is a method in which after laminating with a foamed paper via a thermoplastic resin or an adhesive and drying, a plastic film which is a support is peeled off and a metal vapor deposition layer is transferred to the surface of the foamed paper. The latter method is more effective and preferred.

Aluminum, gold, silver, a cylinder, etc. are used as a metal used for metal deposition processing on a plastic film (for example, polyethylene terephthalate film, polyethylene film, etc.), but aluminum is used in terms of cost and appearance. Is preferred. However, when a foamed paper and a metal vapor deposition film are attached using a normal thermoplastic resin, etc., when the solvent is dried and thermocompression-bonded with a heating roll, or the heat of the melted thermoplastic resin or the like is added, the foamed paper The unexpanded fine particles inside cause foaming again,
The surface of the metal vapor deposition layer after transfer becomes uneven. In order to prevent this phenomenon, as a result of intensive studies, it was found that it is preferable to use an electron beam curable resin as an adhesive used for bonding. That is, by using an electron beam curable resin, after bonding the foamed paper and the metal vapor deposition film, the adhesion and drying can be completed simply by irradiating the electron beam, so the transfer surface is affected by post-foaming due to heating. It is possible to obtain a metallized paper which has excellent smoothness and excellent metal gloss and printability. Further, the metal vapor-deposited paper having such a structure can be easily pulverized by using a used paper disintegrator (various refiners, etc.), and thus can be used as a raw material for recycled paper.

The electron beam curable resin used in the present invention is not particularly limited as long as it is a resin curable by an electron beam, but is generally used as an oligomer which is a base resin and for dilution. It is composed of a combination of the above monomers, and various pigments and additives may be further mixed and used. The electron beam curable oligomer usually has a high viscosity, and therefore, it is usually diluted with a monofunctional monomer or a polyfunctional monomer to adjust the viscosity before use.
However, it does not matter whether the monomer is used alone or the oligomer is used alone.

The electron beam curable resin used in the present invention can be selected, for example, from the following compounds. (1) Aliphatic, alicyclic and araliphatic acrylate compounds of 1 to 6 valent alcohols and polyalkylene glycols. (2) Acrylate compounds of aliphatic, alicyclic, and aromatic-aliphatic alcohols having 1 to 6 valent alcohols to which an alkylene oxide is added. (3) Polyacryloyl alkyl phosphates. (4) A reaction product of a carboxylic acid, a polyol, and acrylic acid. (5) A reaction product of an isocyanate, a 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.

More specifically, as electron beam curable resins, methyl acrylate, ethyl acrylate, butyl acrylate, lauryl acrylate, stearyl acrylate, N-vinylpyrrolidone,
Acryloylmorpholine, 2-ethylhexyl acrylate, 2-ethylhexyl carbitol acrylate,
2-hydroxyethyl (meth) acrylate, 2-hydroxypropyl (meth) acrylate, 2-hydroxybutyl (meth) acrylate, tetrahydrofurfuryl (meth) acrylate, caprolactone-modified tetrahydrofurfuryl acrylate, cyclohexyl (meth) acrylate, Dicyclohexyl acrylate, isobonyl (meth) acrylate, benzyl (meth) acrylate, ethoxydiethylene glycol acrylate, methoxytriethylene glycol acrylate, methoxypropylene glycol acrylate, polyethylene glycol diacrylate, epichlorohydrin-modified polyethylene glycol diacrylate, nonylphenoxy polyethylene glycol acrylate, ethylene oxide Denatured phenoki Acrylate, N, N-dimethylaminoethyl (meth) acrylate, 1,4-butanediol di (meth) acrylate, 1,6-hexanediol di (meth) acrylate, diethylene glycol diacrylate, tripropylene glycol diacrylate, trimethylol Propane triacrylate, ethylene oxide modified trimethylol propane triacrylate, propylene oxide modified trimethylol propane triacrylate, neopentyl glycol modified trimethylol propane diacrylate, glycerin triacrylate, ethylene oxide modified glycerin triacrylate, pentaerythritol triacrylate, pentaerythritol Tetraacrylate, ethylene oxide modified pentaerythritol te Laacrylate, dipentaerythritol tetraacrylate, dipentaerythritol pentaacrylate, dipentaerythritol hexaacrylate, caprolactone modified dipentaerythritol hexaacrylate, polyoxyethylene epichlorohydrin modified bisphenol A diacrylate, ethylene oxide modified bisphenol A diacrylate, propylene oxide modified Bisphenol A diacrylate, neopentyl glycol diacrylate, hydroxybivalic acid ester neopentyl glycol diacrylate, ethylene oxide modified phenoxyphosphoric acid acrylate, ethylene oxide modified phthalic acid acrylate, polybutadiene acrylate, and tris (acryloxyethyl) isocyanurate Na Can you name some?

In the present invention, it is preferable to further add an inorganic pigment to the electron beam curable resin in order to improve the adhesion between the electron beam curable resin and the metal vapor deposition layer or to reduce the cost. As the inorganic pigment, clay, talc, calcium carbonate, etc. are mainly used, but in addition, magnesium carbonate, silica, zinc white, barium sulfate, titanium oxide, etc. can all be used. The surface of each of these inorganic pigments may be surface-treated with a hydroxide such as aluminum or silicon.
Examples of the method for applying the electron beam curable resin to the surface of the foam paper include bar coating, blade coating, squeeze coating, air knife coating, roll coating, gravure coating and transfer coating. May be used. For this reason, a fountain coater or slit die coater system can also be used.

In the present invention, regarding the surface smoothness of the metal vapor deposition layer, the value of the center line average roughness (Ra) is preferably 0.1 μm or less, more preferably from the viewpoint of printability or appearance due to a beautiful metallic luster. Is 0.05 μm or less. When the Ra value is 0.1 μm or more, printability or appearance may be impaired. The center line average roughness (Ra) is a value based on JIS B-0601. The amount of the electron beam curable resin applied on the paper base material is 5 to 30 g / m ² in terms of dry weight, and preferably 10
Is about 25 g / m ² . At this time, if the coating amount is less than 5 g / m ² , the surface smoothness becomes insufficient and a satisfactory adhesive force cannot be obtained. On the other hand, if it exceeds 30 g / m ² , not only is it economically disadvantageous, but the cured coating film may become too hard depending on the electron beam curable resin used.

In the present invention, a synthetic resin is mainly used between the foamed paper and the electron beam curable resin layer in order to improve smoothness and to prevent the electron beam curable resin from penetrating into the foamed paper. There is no problem even if an undercoat layer as a component is provided. Examples of the synthetic resin used for the undercoat layer include alkyd resins, acrylic resins, vinyl resins, cellulose resins, urethane resins, polyester resins, copolymer resins, etc., solvent-based or water-based. It is dissolved or dispersed in the system medium and applied. Further, an electron beam curable resin or an ultraviolet curable resin can also be used. Such an undercoat layer is a means generally used in the field of coating and processing an electron beam curable resin on a sheet-shaped substrate (base paper). For example, for photographic printing paper coated with an electron beam curable resin. It is used as a support, electrophotographic transfer paper, heat-sensitive base paper, process release paper, thermal transfer receiving paper, inkjet receiving paper, printing paper, wrapping paper and the like.

As the electron beam accelerator used for electron beam irradiation, any of the Van de Graaff scanning system, the double scanning system, the broad beam system, and the curtain beam system can be used, but a curtain beam which is relatively inexpensive and has a large output can be used. The system type is effectively used.
The acceleration voltage at the time of electron beam irradiation is preferably 100 to 300 Kv, and the absorbed dose is 0.1 to 8 Mra.
d is preferable, and 0.2 to 5 Mrad is particularly preferable. The oxygen concentration in the atmosphere during electron beam irradiation is
Preferably 1000 ppm or less, more preferably 500
Carry out below ppm. When the oxygen concentration is 1000 ppm or more, the polymerization reaction of the resin composition may be hindered by the presence of oxygen and the curing may be insufficient. However, of course, there is no problem in lowering the oxygen concentration by using an inert gas for the purpose of suppressing ozone generation due to electron beam irradiation, or for the purpose of cooling a window that generates heat when the electron beam passes. Further, the type and concentration of the coexisting gas, the temperature and the humidity of the atmosphere are not particularly limited, and coexistence with an inert gas such as nitrogen may also be allowed.

The metal vapor-deposited paper obtained in the present invention may be directly used as a packaging material or a container as it is, but in some cases, it may be attached to a base paper laminated with polyethylene or the like in advance and used.
It is also possible to cover a container or the like which originally has poor heat insulation with the metallized paper of the present invention to improve the heat insulation effect.

[0023]

EXAMPLES The present invention will be described in more detail with reference to the following examples, but of course the present invention is not limited thereto. In the following, "%" and "part"
Indicates "% by weight" and "parts by weight", respectively. Example 1 80% hardwood bleached pulp (LBKP) beaten to 450 ml Canadian standard freeness (CSF) and Canadian standard freeness (C)
SF) Softwood bleached pulp beaten to 470 ml (NBK)
P) in a pulp slurry in which 100 parts of pulp composed of 20% is dispersed, and thermally expandable microcapsules (trademark: Matsumoto Microsphere F-30D, Matsumoto Yushi-Seiyaku Co., Ltd.).
Made, particle size 10 ~ 20μm, optimum foaming temperature 130 ° C)
10 parts, dry paper strengthening agent (trademark: Polystron 117,
Arakawa Chemical Co., Ltd.) 0.2 parts, cationized starch (trademark: CATO-15, Oji National Co., Ltd.) 1.0 part,
Alkyl ketene dimer type sizing agent (trademark: Size Pine K903, manufactured by Arakawa Chemical Industry Co., Ltd.) 0.03 part, and wet paper strength enhancer (trademark: Kamen 557H, manufactured by DIC Hercules Co., Ltd.) 0.4 part are well stirred. While being added, water was added to adjust the pulp concentration to 0.03% and the pH to 7.3 to obtain a papermaking raw material. Using the obtained papermaking raw material, according to a conventional method, a square handmade sheet machine (80 mesh) was used to make a paper having a basis weight of 300 g / m ² and pressed at 3 Kg / cm ² for 1 minute, and then sandwiched with a filter paper. Then, a 5 kg couch roll was rolled, and the water content was adjusted to 66% by changing the number of filter papers and the number of times the roll was used. Then, the surface temperature 120
Lab press machine (Trademark: Lab Press 30
T, Toyo Seiki Seisakusho) dry treatment (press time: 120
Second, pressurization: 2.8 Kg / m ² ) was performed to obtain a sheet.
The basis weight and density are measured according to JIS P-
8124 and JIS P-8118.

Next, the following composition for electron beam curable resin layer (composition 1) was prepared. Composition 1 Ingredient weight difunctional urethane acrylate oligomer 50 parts by weight (trademark: New Frontier R-1204, manufactured by Dai-ichi Kogyo Seiyaku) acryloyl morpholine 30 parts by weight (trademark: ACMO, manufactured by Kojin) 3PO modified trimethylolpropane tri Acrylate 20 parts by weight (Trademark: TMP-3P, manufactured by Dai-ichi Kogyo Seiyaku Co., Ltd.) 2000 with a Cowles dissolver.
An electron beam curing composition was prepared by mixing and dispersing at 20 rpm for 20 minutes. Then, the above composition was applied to one surface of foamed paper using a Meyer bar so that the coating amount after curing would be 20 g / m ² , and aluminum vapor deposition processing was performed thereon (aluminum film thickness). : About 500 Å) After bonding a polyethylene terephthalate film (hereinafter referred to as PET film) having a thickness of 75 μm,
The composition was cured by irradiating an electron beam from the back of this PET film under the conditions of an accelerating voltage of 175 Kv and an irradiation dose of 4 Mrad. After that, the PET film was peeled off from the cured layer, and the aluminum layer was transferred onto the surface of the paper base material to obtain a metal vapor deposition paper. The following evaluation was performed using the obtained metal vapor-deposited paper, and the results are shown in Table 1.

[Evaluation of Heat Insulation] A box of 200 mm × 100 mm was made by using expanded polystyrene having a thickness of 9 mm, the sample was sandwiched in the center of the box to divide the space in the box into two, and one space was long. A 100 mm thick nichrome wire was inserted, and a current of 100 V and 2 A was applied to the nichrome wire using a slider to heat the nichrome wire, which was used as a heat source. The sample was set such that the metal vapor deposition surface faces the heat source. In addition, a thermocouple is attached near the center of the front and back of the sample, and a data collector (trademark: data collector
AM-7052, Anritsu Keiki Tokyo Sales Co., Ltd.) was used to record the temperature change on the front and back of the sample for 30 minutes immediately after energization. Here, the temperature difference between the front and back of the sample after 30 minutes was defined as Tm, and the heat insulating property of the sample was evaluated based on this value.
The larger the value of Tm, the better the heat insulating property. [Evaluation of smoothness of metal vapor deposition layer surface] JIS B-060
Based on 1, the center line average roughness (R
a) was measured. The smaller the value of Ra, the better the smoothness. [Evaluation of printability] RI printing tester (trademark: RI-2
Using a mold (manufactured by Akira Seisakusho Co., Ltd.), printing was performed on the metal vapor deposition surface under the following conditions, and the coating was left to dry for 24 hours. Ink type: Indigo ink (Trademark: DIC TRANS-G N-Type,
(Manufactured by Dainippon Ink), ink amount: 2.0 ml / m ² , printing speed: 30 rpm. Regarding the glossiness of the obtained sample after printing, JIS
The gloss degree of 60 ° / 60 ° was measured using a gloss meter VGS-1D (manufactured by Nippon Denshoku Industries Co., Ltd.) based on Z8741. The glossiness means that the larger the value is, the better the ink inking property and the smoothness of the inking surface are, and the printability is judged from practicality, and the glossiness value of 120 or more is ○ ( Good), Δ from 50 to less than 120 (slightly inferior,
It was evaluated as "poor" for practical use) and "poor" (poor) for less than 50.

Example 2 Except that the amount of electron beam curable resin applied was 10 g / m ² .
A metal vapor deposition paper was prepared in the same procedure as in Example 1. Furthermore, the same evaluation as in Example 1 was performed, and the results are shown in Table 1.

Example 3 Foamed paper was produced in the same procedure as in Example 1. However, the following composition for electron beam curable resin layer (composition 2) was separately prepared and used in place of the composition 1. Composition 2 Ingredient weight trifunctional urethane acrylate oligomer 100 parts by weight (trademark: New Frontier R-1301, manufactured by Dai-ichi Kogyo Seiyaku Co.) carrying out the same evaluation as in Example 1. The results are shown in Table 1.

Example 4 Example 1 was repeated except that the basis weight of the foamed paper was changed to 150 g / m ^2.
A metal vapor-deposited paper was prepared by the same procedure. Further Example 1
The same evaluations as above were performed, and the results are shown in Table 1.

Example 5 In the production of foam paper, heat-expandable microcapsules (trademark: Matsumoto Microsphere F-30D, manufactured by Matsumoto Yushi-Seiyaku Co., Ltd., particle size 10 to 20 μm, optimum foaming temperature 1)
30 ° C.), instead of heat-expandable microcapsules (trademark: Matsumoto Microsphere F-20D, manufactured by Matsumoto Yushi-Seiyaku Co., Ltd., particle size 10 to 20 μm, optimum foaming temperature 1
A metal vapor-deposited paper was prepared in the same procedure as in Example 1 except that 20 ° C.) was used. Furthermore, the same evaluation as in Example 1 was performed, and the results are shown in Table 1.

Comparative Example 1 In a papermaking raw material, thermally expandable microcapsules (trademark:
Matsumoto Microsphere F-30D, manufactured by Matsumoto Yushi-Seiyaku Co., Ltd., particle size 10 to 20 μm, optimum foaming temperature 130
A metal-deposited paper was prepared in the same procedure as in Example 1 except that the temperature (° C) was omitted. Furthermore, the same evaluation as in Example 1 was performed,
The results are shown in Table 1.

Comparative Example 2 A foamed paper having only a paper base layer was prepared in the same manner as in Example 1,
Subsequent application of the electron beam curing resin and transfer of the metal vapor deposition layer were omitted. The same evaluation as in Example 1 was performed using the foamed paper, and the results are shown in Table 1.

Comparative Example 3 A foamed paper was prepared by the same procedure as in Example 1, and then a metal vapor deposition film obtained by applying and drying an acrylic adhesive using toluene as a solvent was formed into a foamed paper via the adhesive. After the bonding, the metal vapor deposition layer was transferred by pressing with a roll heated to 120 ° C. to obtain a metal vapor deposition paper. Furthermore, the same evaluation as in Example 1 was performed, and the results are shown in Table 1.

Comparative Example 4 The same evaluation as in Example 1 was carried out using expanded polystyrene having a basis weight of 170 g / m ² , and the results are shown in Table 1.

[0034]

[Table 1]

[0035]

According to the present invention, by providing a metal vapor deposition layer on at least one surface of a paper base material containing foam particles through an electron beam curing resin coating layer, the heat insulating property is extremely excellent and is extremely high. It has become possible to obtain metal-deposited paper that is smooth and has excellent printability and metallic luster.

Claims (2)

[Claims] 1. A paper base material (a), a resin coating layer (b) formed on at least one surface of the paper base material (a) and cured by an electron beam, and the resin coating layer. A metal having a formed metal vapor deposition layer (c), the paper substrate (a) containing foam particles, and having a density of 0.1 to 0.4 g / cm ^3. Vapor-deposited paper. 2. The metallized paper according to claim 1, wherein the value of the center line average roughness (Ra) of the surface of the metallized layer (c) based on JIS B-0601 is 0.1 μm or less.