Moisture-proof decorative paper, moisture-proof decorative plate and fitting

Abstract

To provide moisture-proof decorative paper, a moisture-proof decorative plate and a fitting which can prevent occurrence of warpage of a decorative plate and the like, while reducing a used amount of plastic.SOLUTION: Moisture-proof decorative paper 10 has a decorative layer 1a and a moisture-proof layer a2. The decorative layer a1 has a paper base material 3, and a printed pattern layer 2 and a protective resin layer 1 in this order on one surface of the paper base material 3. The moisture-proof layer a2 has an anchor coat layer 4, a silica vapor-deposited layer 5 and an overcoat layer 6 in this order on the other surface of the paper base material 3. The anchor coat layer 4 and the overcoat layer 6 are each brought into direct contact with the silica vapor-deposited layer 5. In a cross section in a thickness direction of the moisture-proof decorative paper 10, a softening temperature of the anchor coat layer 4 measured by a local thermal analysis method is 180°C or higher.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to moisture-proof decorative paper used for fixtures such as interior doors, kitchen doors, storage doors, and closets, a moisture-proof decorative board using the same, and fixtures such as doors. Specifically, it relates to a moisture-proof decorative paper having a function of preventing warping of decorative boards and the like caused by humidity changes, temperature changes, etc., a moisture-proof decorative board using the same, and fixtures such as doors using the same.

Background Art

[0002] Conventionally, in fixtures such as interior doors, kitchen doors, and storage doors, warping may gradually occur during use due to the relationship between humidity and temperature. This is mainly a phenomenon that occurs because a humidity difference and a temperature difference occur between the inside and outside of the room, causing a bias in the moisture content distribution inside the wooden fixture. That is, when a humidity difference occurs, a difference in the amount of moisture absorption and release occurs on the front and back surfaces of the wooden fixture. On the side with high humidity, it expands due to high moisture content, and on the side with low humidity, it shrinks due to low moisture content, resulting in warping. Also, when a temperature difference occurs, the moisture contained in the wooden base material moves to the cold side, creating a gradient in moisture content in the thickness direction and causing warping. Usually, the low-temperature side often has high humidity and high moisture content. In this case, since the two effects act in the same direction, it is considered that the warping becomes most prominent.

[0003] As a method for suppressing the warping of such wooden fixtures, measures such as using sheets of the same material on the front and back surfaces of fixtures such as doors to prevent warping to one side, and using a metal support on the frame of the fixture have been taken. Also, a method of reducing the amount of moisture absorption and desorption of members by using a moisture-proof sheet with low moisture permeability on the members of the fixture is widely used. Further, in Patent Document 1, a moisture-proof decorative sheet having a five-layer structure of a protective resin layer / printed pattern layer / inter-paper reinforcing paper / synthetic resin layer / inter-paper reinforcing paper is adhered to the front surface side of a plate base material such as plywood via an adhesive, and on the back surface side of the plate base material, a moisture-proof back sheet having a three-layer structure of inter-paper reinforcing paper / synthetic resin / inter-paper reinforcing paper is adhered via an adhesive to form a moisture-proof decorative board, and it has been proposed to adhere this moisture-proof decorative board to the front and back of a flush door via an adhesive respectively. The moisture permeability of the moisture-proof sheet at this time is preferably 5 (g / m 2 ·24h) or more and 30 (g / m 2 ·24h) or less. According to this configuration, in the moisture-proof decorative board used as the front and back decorative surface materials of the flush door, since the moisture-proof sheet and the moisture-proof back sheet adhered to the front and back of the plate base material have a high moisture-proof function, the change in the moisture content of the plate base material of the moisture-proof decorative board due to the temperature difference and humidity difference between the front surface side and the back surface side of the flush door is suppressed, and as a result, it is said to exhibit an anti-warping effect.

[0004] Also, when even higher moisture-proof performance is required, as a method for preventing deformation of the decorative board, a method of laminating a moisture-proof sheet provided with a vapor deposition layer on a synthetic resin base material is known. In order to obtain high moisture-proof performance, since it is necessary to provide a vapor deposition layer on a smooth surface, a synthetic resin base material is generally selected, and it is technically difficult to obtain high moisture-proof performance using a paper base material. On the other hand, in recent years, due to the increasing environmental awareness triggered by problems such as marine plastic waste, the movement to reduce plastic has been growing. From the perspective of reducing the use amount of plastic materials, in various fields, the use of paper instead of plastic materials has been considered.

[0005] For example, Patent Document 2 below discloses a gas barrier laminate in which a barrier layer is laminated on paper, and a paper-based barrier material in which an anchor coat layer, a vapor deposition layer, and an overcoat layer are provided in this order on a paper substrate has been proposed.

Prior Art Documents

Patent Documents

[0006]

Patent Document 1

Patent Document 2

Summary of the Invention

Problems to be Solved by the Invention

[0007] In recent years, from the perspective of the design of doors, doors with a height exceeding 2 m have been increasingly adopted. As the height of the door increases, even a slight amount of warping will result in a large warping of the entire door. Therefore, higher moisture resistance is required for the sheets used for doors and the like. As a sheet having high moisture resistance, a moisture-proof sheet having a metal vapor deposition film and a coat layer on a synthetic resin substrate has been proposed. The moisture permeability is less than 5 (g / m 2 ·24 h), and it is said to have a high warping prevention effect.

[0008] However, since all of these moisture-proof sheets use plastic materials, considering the environmental aspect, it is desirable to reduce the amount of plastic used. In addition, in the recycling of fixtures such as decorative panels and doors obtained by laminating these moisture-proof sheets, it is necessary to separate the woody substrate and the plastic part (synthetic resin layer or synthetic resin substrate), and it is often not suitable for recycling.

[0009] In recent years, in consideration of the environmental aspect, the development of gas barrier materials based on paper without using synthetic resin films and the like has been promoted. However, when handling such materials, stretching wrinkles or using a pressure bonding method such as ironing may cause cracks in the barrier layer, resulting in a problem of reduced gas barrier properties.

[0010] In Patent Document 2, paragraph 0021 states that "the anchor coat layer contains a first polyolefin having a polar group. Such an anchor coat layer is excellent in flexibility, can suppress cracking of the vapor deposition layer after bending, and can improve the adhesion between the anchor coat layer and the vapor deposition layer." An attempt has been made to suppress cracking of the vapor deposition layer after bending. However, in the above Patent Document 2, no consideration has been given to the fact that when an inorganic oxide is vapor deposited as a vapor deposition film, the barrier property is less stable than when a metal is vapor deposited.

[0011] The present invention has been made to solve the above unsolved problems, and aims to provide a moisture-proof decorative paper capable of preventing warping of a decorative board or the like even when used in a place where there is a large difference in the temperature and humidity environment on both sides (front side and back side) of the decorative board or the like, a moisture-proof decorative board using the same, and a fixture such as a door using the same. That is, the present application aims to provide a moisture-proof decorative paper, a moisture-proof decorative board, and a fixture that can prevent the occurrence of warping in a decorative board or the like while reducing the amount of plastic used.

Means for Solving the Problems

[0012] In order to achieve the above object, according to one aspect of the present invention, there is provided a moisture-proof cosmetic paper including a cosmetic paper (cosmetic layer) and a moisture-proof layer, wherein the cosmetic paper has a printed pattern layer and a protective resin layer provided in this order on one surface of a paper base material, and the moisture-proof layer is a moisture-proof cosmetic paper including an anchor coat layer, a silica vapor deposition layer, and an overcoat layer provided in this order on the other surface of the paper base material, the anchor coat layer and the overcoat layer are each in direct contact with the silica vapor deposition layer, and in the cross section in the thickness direction of the moisture-proof cosmetic paper, the softening point of the anchor coat layer measured by local thermal analysis is 180 ° C or higher. That is, the moisture-proof cosmetic paper according to one aspect of the present invention is a moisture-proof cosmetic paper including a cosmetic layer and a moisture-proof layer, wherein the cosmetic layer includes a paper base material, a printed pattern layer, and a protective resin layer provided in this order on one surface of the paper base material, and the moisture-proof layer includes an anchor coat layer, a silica vapor deposition layer, and an overcoat layer provided in this order on the other surface of the paper base material.

[0013] Further, according to another aspect of the present invention, the moisture-proof cosmetic paper of the above aspect is adhered with the overcoat layer side of the moisture-proof cosmetic paper facing the surface of a board base material such as plywood, and a back surface moisture-proof sheet having a moisture permeability of 5 (g / m 2 ·24 h) or less is adhered to the back surface of the board base material, thereby providing a moisture-proof decorative board. That is, in the moisture-proof decorative board according to one aspect of the present invention, the surface on the overcoat layer side of the moisture-proof cosmetic paper of the above aspect is adhered to one surface of the board base material, and a back surface moisture-proof sheet having a moisture permeability of 5 (g / m 2 ·24 h) or less is adhered to the other surface of the board base material.

[0014] Furthermore, according to another aspect of the present invention, there is provided a fixture such as a door provided with anti-warping, including a wood-based core member in which the moisture-proof decorative board of the above aspect is pressure-bonded such that the back surface moisture-proof sheet side of the moisture-proof decorative board is in contact with the front and back surfaces. That is, in the fixture according to one aspect of the present invention, the surface on the back surface moisture-proof sheet side of the moisture-proof decorative board of the above aspect is adhered to the front and back surfaces of the wood-based core member, respectively.

Advantages of the Invention

[0015] According to one aspect of the present invention, it is possible to provide a moisture-proof decorative paper, a moisture-proof decorative board, and a fixture that can prevent the occurrence of warping in a decorative board or the like while reducing the amount of plastic used.

Brief Description of the Drawings

[0016]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Modes for Carrying Out the Invention

[0017] Hereinafter, embodiments of the present invention will be described with reference to the drawings. Here, the drawings are schematic, and the relationship between the thickness and the planar dimensions, the ratio of each thickness, etc. are different from the actual ones. Further, the embodiments shown below are examples of the configurations for embodying the technical idea of the present invention, and the technical idea of the present invention does not specify the materials, shapes, etc. of the constituent parts as the following ones. The technical idea of the present invention can be variously modified within the technical scope defined by the claims described in the claims.

[0018] <Configuration> As shown in FIG. 1, the moisture-proof decorative paper 10 according to the present embodiment is formed by laminating a protective resin layer 1, a printed pattern layer 2, a paper base material 3, an anchor coat layer 4, a silica vapor deposition layer 5, and an overcoat layer 6 in this order. In this embodiment, the protective resin layer 1, the printed pattern layer 2, and the paper base material 3 constitute a decorative paper (decorative layer) a1, and the anchor coat layer 4, the silica vapor deposition layer 5, and the overcoat layer 6 constitute a moisture-proof layer a2. Note that the anchor coat layer 4 and the overcoat layer 6 may each be in direct contact with the vapor deposition layer (silica vapor deposition layer) 5.

[0019] As shown in FIG. 2, for the moisture-proof decorative paper 10 according to this embodiment, it is also possible to provide an adhesive primer layer 7 on the front surface of the overcoat layer 6 of the moisture-proof decorative paper 10, that is, the surface opposite to the silica vapor deposition layer 5.

[0020] FIG. 3 is a schematic cross-sectional view showing an example of a moisture-proof decorative board 21. The moisture-proof decorative board 21 includes a board base material S, a moisture-proof decorative paper 10 provided on one surface of the board base material S, and a back surface moisture-proof sheet 11 provided on the other surface of the board base material S. The moisture-proof decorative paper 10 is provided such that the overcoat layer 6 is in contact with one surface of the board base material S. The back surface moisture-proof sheet 11 is preferably a back surface moisture-proof sheet having characteristics equivalent to the moisture permeability of the moisture-proof decorative paper 10, and the moisture permeability is 5 g / m 2 · A back surface moisture-proof sheet of 24 h or less is preferable, and 3 g / m 2 · A back surface moisture-proof sheet of 24 h or less is more preferable.

[0021] Note that, for example, as the back surface moisture-proof sheet 11, a moisture-proof sheet having a metal vapor deposition film and a coat layer on a synthetic resin base material can be used. However, from the environmental aspect of reducing the use amount of plastics, a moisture-proof sheet having a moisture-proof layer on a paper base material is preferable.

[0022] As the back moisture-proof sheet 11, as shown in the moisture-proof decorative board 22 of FIG. 4, a back moisture-proof sheet 12 having a moisture-proof layer with the same characteristics as the moisture-proof layer a2 of the moisture-proof decorative paper 10 can also be applied. That is, the back moisture-proof sheet 12 is formed by laminating an anchor coat layer 4, a silica vapor deposition layer 5, and an overcoat layer 6 on a paper base material 3 in this order, and the overcoat layer 6 is provided in contact with the board base material S. It should be noted that it is also possible to provide an adhesive primer layer (not shown) on the surface of the overcoat layer 6 in the back moisture-proof sheet 12, that is, the surface opposite to the silica vapor deposition layer 5.

[0023] As shown in FIGS. 3 and 4, by adhering the moisture-proof decorative paper 10 to the surface (one surface) of the board base material S and also adhering the back moisture-proof sheet 11 or the back moisture-proof sheet 12 to the back surface (the other surface) side of the board base material S via an adhesive, moisture-proof decorative boards 21 and 22 with warping prevention can be obtained. Note that as the board base material S used in this embodiment, a wood-based board base material such as a medium-density fiberboard (MDF), plywood, or particle board can be used.

[0024] FIGS. 5 and 6 schematically show a part of a fixture 30 such as a flush door obtained by performing a flush process using the moisture-proof decorative boards 21 and 22 shown in FIGS. 3 and 4 on the front and back. The fixture 30 shown in FIGS. 5 and 6 is formed by pressing and bonding a back moisture-proof sheet 11 or a back moisture-proof sheet 12 constituting the moisture-proof decorative board 21 (FIG. 5) or the moisture-proof decorative board 22 (FIG. 6) to the front and back surfaces of a wood-based core member SS with the inner side (the core member SS side) using an adhesive. In this way, a fixture 30 such as a flush door with warping prevention is formed.

[0025] Note that FIG. 5 shows a form using a pair of moisture-proof decorative boards 21, and FIG. 6 shows a form using a pair of moisture-proof decorative boards 22. However, in this embodiment, the moisture-proof decorative board 21 and the moisture-proof decorative board 22 can also be used as a pair of moisture-proof decorative boards.

[0026] Note that as the core member SS used in this embodiment, a wood-based board substrate such as medium density fiberboard (MDF), plywood, or particle board can be used. In the case of a flush door, a core material such as a honeycomb panel can also be used as the core member SS.

[0027] Note that the adhesive used in this embodiment is not limited to, for example, water-based adhesives, solvent-based adhesives, chemical reaction-based adhesives, hot melt adhesives, etc., and any type can be applied. As the adhesive, known ones or commercially available products can be appropriately selected and used.

[0028] Next, the configuration of each layer will be described. <Protective resin layer> The protective resin layer 1 that functions as a surface protection layer is a layer for protecting the surface of the moisture-proof decorative paper 10, and is provided to impart surface physical properties such as scratch resistance, abrasion resistance, stain resistance, water resistance, and weather resistance required for the moisture-proof decorative paper 10, the moisture-proof decorative boards 21 and 22, and the furniture 30 such as doors. The formation of the protective resin layer (surface protection layer) 1 is not particularly limited, and can be formed by a known coating method such as gravure coating.

[0029] There is no particular limitation on the material of the protective resin layer (surface protection layer) 1, and the same materials as those used as the surface protection layer in conventional decorative papers can be used. As materials that can be used for the protective resin layer (surface protection layer) 1, for example, acrylic urethane-based resins and radiation-curable resins can be used. As the acrylic urethane-based resin, for example, a reaction product mainly composed of an acrylic polyol compound as the main agent and an isocyanate compound as the curing agent can be adopted. Also, as the radiation-curable resin, for example, a composition mainly composed of at least one of a prepolymer, an oligomer, and a monomer having a polymerizable unsaturated bond such as a (meth)acryloyl group that has the property of undergoing a crosslinking reaction by irradiation with ionizing radiation such as electron beams or ultraviolet rays can be adopted.

[0030] The protective resin layer (surface protective layer) 1 may be a single layer or a multi-layer of two or three layers. When the protective resin layer 1 is a multi-layer, a gloss-matte expression can be imparted by separately applying a matte resin and a gloss resin. Also, an uneven expression with the resin partially raised can be imparted. Furthermore, an antibacterial agent, an antiviral agent, etc. can be added.

[0031] <Printing pattern layer> The printing pattern layer 2 is for imparting design characteristics, and any pattern can be used as the pattern. As the pattern of the printing pattern layer 2, for example, a wood grain pattern, a stone grain pattern, a cloth grain pattern, a cork pattern, an abstract pattern, etc., or a combination of two or more of these can be used. Also, a betaine ink layer (not shown) can be provided between the printing pattern layer 2 and the paper substrate 3 to ensure concealment. These printing methods are not particularly limited, and known printing methods such as gravure printing, offset printing, silk screen printing, inkjet printing, etc. can be used.

[0032] There is no particular limitation on the printing ink, etc., and there is no particular problem whether it is oil-based or water-based. The printing ink, etc. used for the printing pattern layer 2 can be the same as the printing ink, etc. used for the printing pattern layer in conventional decorative paper. For example, acrylic ink can be used. As the acrylic ink, for example, a two-component curable urethane resin-based ink obtained by blending an isocyanate curing agent into an acrylic polyol-based vehicle can be used.

[0033] Note that the surface roughness (Ra) of the printing pattern layer 2 is preferably in the range of 0.1 μm or more and 10 μm or less, more preferably in the range of 0.5 μm or more and 5 μm or less, and even more preferably in the range of 1 μm or more and 3 μm or less. If the surface roughness (Ra) of the printing pattern layer 2 is within the above numerical range, the adhesiveness between the printing pattern layer 2 and the protective resin layer 1 is improved due to the anchoring effect.

[0034] <Paper substrate 3> The paper base material 3 is not particularly limited and may be appropriately selected according to the applications of the moisture-proof tissue paper 10 and the back moisture-proof sheet 12 to which it is applied. Specific examples of the paper base material 3 include tissue paper, high-quality paper, art paper, cast-coated paper, kraft paper, titanium paper, linter paper, cardboard, gypsum board paper, coated paper, sulfuric acid paper, glassine paper, parchment paper, paraffin paper, Japanese paper, and the like.

[0035] Preferably, tissue paper (so-called paper-interlayer reinforced paper) obtained by co-papermaking a synthetic resin with a paper component (for example, cellulose fiber) to strengthen the inter-paper strength, or paper impregnated with latex or synthetic resin is preferably used. The basis weight of the paper base material 3 is not particularly limited, but when the basis weight of the paper base material 3 is less than 20 g / m 2 , it is too flexible and wrinkles are likely to occur during processing. Also, when the basis weight of the paper base material 3 exceeds 200 g / m 2 , peeling from the paper layer (so-called delamination) is likely to occur. Therefore, the basis weight of the paper base material 3 is preferably in the range of 20 g / m 2 or more and 200 g / m 2 or less, more preferably in the range of 20 g / m 2 or more and 100 g / m 2 or less, and even more preferably in the range of 20 g / m 2 or more and 50 g / m 2 or less.

[0036] Furthermore, for these paper base materials 3, surface treatments such as corona treatment, plasma treatment, and frame treatment may be performed on their surfaces as necessary. Note that the basis weight of the paper base material 3 constituting the back moisture-proof sheet 12 is preferably the same as the basis weight of the paper base material 3 constituting the moisture-proof tissue paper 10, but it may also be greater than or less than the basis weight of the paper base material 3 constituting the moisture-proof tissue paper 10. For example, the basis weight of the paper base material 3 constituting the back moisture-proof sheet 12 may be in the range of 1.1 times or more and 2.0 times or less the basis weight of the paper base material 3 constituting the moisture-proof tissue paper 10. Alternatively, the basis weight of the paper base material 3 constituting the back moisture-proof sheet 12 may be in the range of 0.5 times or more and 0.9 times or less the basis weight of the paper base material 3 constituting the moisture-proof tissue paper 10.

[0037] <Coating layer> The paper base material 3 may be provided with a coating layer (not shown) on the surface in contact with the anchor coating layer 4 described later. By providing the coating layer, it is possible to prevent the anchor coating layer 4 from penetrating into the paper base material 3, and it can also serve as a caulking to fill the unevenness on the surface of the paper base material 3. Therefore, for the paper base material 3 having a coating layer on the surface, the anchor coating layer 4 can be uniformly formed into a film without defects such as coating unevenness.

[0038] The coating layer may contain, as a binder resin, for example, various copolymers such as styrene-butadiene-based, styrene-acrylic-based, and ethylene-vinyl acetate-based, polyvinyl alcohol-based resins, cellulose-based resins, paraffin (WAX), and the like. Further, the coating layer may contain, as a filler, for example, clay, kaolin, calcium carbonate, talc, mica, and the like.

[0039] The thickness of the coating layer is not particularly limited, but for example, it is preferably in the range of 1 μm or more and 10 μm or less, and more preferably in the range of 3 μm or more and 8 μm or less. Further, the surface roughness (Ra) of the coating layer is preferably in the range of 0.1 μm or more and 10 μm or less, more preferably in the range of 0.5 μm or more and 5 μm or less, and even more preferably in the range of 1 μm or more and 3 μm or less. If the surface roughness (Ra) of the coating layer is within the above numerical range, the adhesiveness between the paper base material 3 and the anchor coating layer 4 is improved due to the anchoring effect.

[0040] The mass of the paper base material 3 is preferably 50% by mass or more, more preferably 70% by mass or more, and even more preferably 80% by mass or more based on the mass of the entire moisture-proof cosmetic paper 10. If the mass of the paper base material 3 is 50% by mass or more based on the mass of the entire moisture-proof cosmetic paper 10, compared with conventional moisture-proof members such as a synthetic resin sheet (90% by mass or more of plastic material) such as vinyl chloride, polyethylene, and polypropylene, or a moisture-proof sheet made of paper / polyethylene / paper (although it depends on the thickness of polyethylene, 50% by mass or more is polyethylene in order to have moisture-proof performance), the amount of plastic used is small, so the proportion of the plastic material contained in the moisture-proof cosmetic paper can be sufficiently reduced. In addition, since 50% by mass or more is a paper material, the moisture-proof cosmetic paper 10 and the back moisture-proof sheet 12 according to the present embodiment can be said to be made of paper (display the fact that it is "made of paper").

[0041] Further, the mass of the paper component contained in the paper base material 3 may be 50% by mass or more, preferably 70% by mass or more, and more preferably 80% by mass or more based on the mass of the entire moisture-proof cosmetic paper 10 or based on the mass of the entire back moisture-proof sheet 12.

[0042] <Anchor coat layer> The anchor coat layer 4 is a layer provided on the surface of the paper base material 3 and may have at least one of an epoxy resin, an acrylic urethane resin, an acrylic resin, a polyester-based polyurethane resin, and a polyether-based polyurethane resin. The content of the above resin in the anchor coat layer 4 is, for example, 50% by mass or more, more preferably 70% by mass or more, still more preferably 90% by mass or more, and most preferably 100% by mass.

[0043] Further, the anchor coat layer 4 is a layer provided on the surface of the paper base material 3 and may contain a resin having at least one polar group, or may contain a polyolefin having at least one polar group. The anchor coat layer 4 may also contain a polyvinyl alcohol-based resin.

[0044] The total content of the resin having a polar group (for example, a polyolefin having a polar group) in the anchor coat layer 4 is, for example, 50% by mass or more, more preferably 70% by mass or more, still more preferably 90% by mass or more, and most preferably 100% by mass with respect to the mass of the entire anchor coat layer 4.

[0045] The polyolefin having a polar group may have at least one selected from a carboxyl group, a salt of a carboxyl group, a carboxylic anhydride group, and a carboxylic acid ester. For example, unsaturated carboxylic acids (unsaturated compounds having a carboxyl group such as acrylic acid, methacrylic acid, maleic anhydride, etc.) or unsaturated carboxylic acid esters may be copolymerized with ethylene or propylene, or a salt obtained by neutralizing a carboxylic acid with a basic compound may be used. In addition, those copolymerized with vinyl acetate, epoxy compounds, chlorine compounds, urethane compounds, polyamide compounds, etc. may also be used.

[0046] Specific examples include copolymers of acrylic acid ester and maleic anhydride, ethylene-vinyl acetate copolymers, ethylene-glycidyl methacrylate copolymers, and the like.

[0047] The polyvinyl alcohol-based resin is, for example, a completely saponified polyvinyl alcohol resin, a partially saponified polyvinyl alcohol resin, a modified polyvinyl alcohol resin, or an ethylene-vinyl alcohol copolymer resin. Further, the degree of polymerization of the polyvinyl alcohol-based resin is preferably 300 or more and 1700 or less. If the degree of polymerization is 300 or more, the gas barrier property and bending resistance of the moisture-proof cosmetic paper 10 and the back moisture-proof sheet 12 will be good. If the degree of polymerization is 1700 or less, the viscosity of the coating solution of the polyvinyl alcohol-based resin described later will be low and the coatability will be good.

[0048] The anchor coat layer 4 may contain other components in addition to the polyolefin having the polar group and the polyvinyl alcohol-based resin. Examples of the other components include resins such as polyolefins other than the polyolefin having the polar group, polyacrylic, polyester, polyurethane, polycarbonate, polyurea, melamine, phenol, polyethyleneimine, polylactic acid, polyamide, polyimide, starch and its derivatives, and cellulose derivatives, and additives such as silane coupling agents, organic titanates, glycerin, glycols, casein, and waxes.

[0049] The anchor coat layer 4 is provided for improving the adhesion to the paper substrate 3 and for improving the gas barrier properties of the moisture-proof cosmetic paper 10 and the back moisture-proof sheet 12. Since the anchor coat layer 4 contains a resin having at least one kind of polar group, the moisture-proof cosmetic paper 10 and the back moisture-proof sheet 12 are excellent in gas barrier properties. By containing a polyvinyl alcohol-based resin, they are even more excellent in water vapor barrier properties and oxygen barrier properties. By containing a polyolefin, a dense film can be formed due to the crystallinity of the polyolefin, and water vapor barrier properties are exhibited.

[0050] The lower limit of the thickness of the anchor coat layer 4 is, for example, 1 μm or more, more preferably 2 μm or more. The upper limit is, for example, 20 μm or less, more preferably 10 μm or less, and even more preferably 5 μm or less. If the thickness of the anchor coat layer 4 is 1 μm or more, the vapor deposition layer 5 can be laminated uniformly. The thicker the anchor coat layer 4, the more efficiently the unevenness of the paper substrate 3 can be filled, and the vapor deposition layer 5 can be laminated more uniformly. Also, if the thickness of the anchor coat layer 4 is 20 μm or less, each of the above layers can be laminated uniformly while suppressing costs.

[0051] The softening temperature measured by local thermal analysis in the anchor coat layer 4 is 180 °C or higher, more preferably 185 °C or higher, and even more preferably 190 °C or higher. The upper limit of the softening temperature is not particularly limited. If the softening temperature of the anchor coat layer 4 is 180°C or higher, a decrease in the density of the vapor deposition layer 5 can be suppressed. The higher the softening temperature, the more the thermal energy of the vapor deposition materials such as SiOx particles during vapor deposition can reduce the softening and elongation of the anchor coat layer 4, thus further suppressing the occurrence of macro cracks in the vapor deposition layer (silica vapor deposition layer) 5 and the decrease in the density of the vapor deposition layer 5.

[0052] Incidentally, the adjustment of the softening temperature of the anchor coat layer 4 can be achieved by adjusting the constituent materials of the anchor coat layer 4 and the ratio of the resin to be combined. Moreover, it is more preferable that the softening temperature measured by the local thermal analysis method in the anchor coat layer 4 is 180°C or higher in the cross-section in the thickness direction of the moisture-proof tissue paper 10. Thus, it is preferable that the softening temperature measured by the local thermal analysis method in the anchor coat layer 4 is 180°C or higher regardless of the measurement location, and it is more preferable that the softening temperature measured in the cross-section in the thickness direction of the moisture-proof tissue paper 10 is 180°C or higher.

[0053] As a method for providing the anchor coat layer 4, for example, a coating liquid containing the constituent materials and solvent of the above-described anchor coat layer 4 is applied onto the paper base material 3 and dried. Examples of the solvent contained in the coating liquid for forming the anchor coat layer 4 include water, methyl alcohol, ethyl alcohol, isopropyl alcohol, n-propyl alcohol, n-butyl alcohol, n-pentyl alcohol, dimethyl sulfoxide, dimethylformamide, dimethylacetamide, toluene, hexane, heptane, cyclohexane, acetone, methyl ethyl ketone, diethyl ether, dioxane, tetrahydrofuran, ethyl acetate, and butyl acetate. These solvents may be used alone or in combination of two or more. Among these, from the perspective of properties, methyl alcohol, ethyl alcohol, isopropyl alcohol, toluene, ethyl acetate, methyl ethyl ketone, and water are preferable. Also, from the perspective of the environment, methyl alcohol, ethyl alcohol, isopropyl alcohol, and water are preferable.

[0054] Also, the surface roughness (Ra) of the anchor coat layer 4 is preferably in the range of 0.1 μm or more and 10 μm or less, more preferably in the range of 0.5 μm or more and 5 μm or less, and even more preferably in the range of 1 μm or more and 3 μm or less. If the surface roughness (Ra) of the anchor coat layer 4 is within the above numerical range, the adhesion between the anchor coat layer 4 and the vapor deposition layer 5 is improved due to the anchoring effect. Therefore, the frequency of cracks or the like occurring in the vapor deposition layer 5 can be reduced, and excellent gas barrier properties can be imparted.

[0055] <Vapor deposition layer> The vapor deposition layer 5 is a layer formed by vapor-depositing silica, which is an inorganic compound, and may contain silicon oxide (SiOx) or the like. Also, the vapor deposition layer 5 may be provided on the surface of the anchor coat layer 4 so as to be in contact with the anchor coat layer 4.

[0056] The thickness of the vapor deposition layer 5 may be appropriately set according to the intended use. The lower limit is preferably 10 nm or more, more preferably 20 nm or more, and even more preferably 30 nm or more. The upper limit of the thickness of the vapor deposition layer 5 is preferably 100 nm or less, more preferably 80 nm or less. By setting the thickness of the vapor deposition layer 5 to 10 nm or more, it is easy to make the continuity of the vapor deposition layer 5 sufficient, and by setting it to 100 nm or less, the occurrence of curl in the moisture-proof tissue paper 10 and the back surface moisture-proof sheet 12 and cracks in the vapor deposition layer 5 can be sufficiently suppressed, and sufficient gas barrier performance and flexibility can be easily achieved.

[0057] The vapor deposition layer 5 is preferably formed by vacuum film-forming means from the viewpoints of water vapor and oxygen gas barrier performance and film uniformity. Known methods such as vacuum evaporation, sputtering, and chemical vapor deposition (CVD) are available as film-forming means, but the vacuum evaporation method is preferred because of its high film-forming speed and high productivity. Among the vacuum evaporation methods, in particular, the film-forming means by electron beam heating is effective because the film-forming speed can be easily suppressed by the irradiation area, electron beam current, etc., and the temperature increase and decrease of the vapor deposition material can be performed in a short time.

[0058] Also, the surface roughness (Ra) of the vapor deposition layer 5 is preferably in the range of 0.1 μm or more and 10 μm or less, more preferably in the range of 0.5 μm or more and 5 μm or less, and even more preferably in the range of 1 μm or more and 3 μm or less. If the surface roughness (Ra) of the vapor deposition layer 5 is within the above numerical range, the adhesiveness between the vapor deposition layer 5 and the overcoat layer 6 is improved due to the anchoring effect. Therefore, the frequency of cracks and the like occurring in the vapor deposition layer 5 can be reduced, and excellent gas barrier properties can be imparted.

[0059] <Overcoat layer> The overcoat layer 6 is provided on the surface of the vapor deposition layer 5 so as to be in contact with the vapor deposition layer 5. The overcoat layer 6 may contain, for example, a polyolefin having at least one kind of polar group.

[0060] The polyolefin having a polar group may have, for example, at least one selected from a carboxyl group, a salt of a carboxyl group, a carboxylic anhydride group, and a carboxylic acid ester. Specifically, a copolymer of an acrylate and maleic anhydride, an ethylene-vinyl acetate copolymer, an ethylene-glycidyl methacrylate copolymer, or the like may be used.

[0061] Since the overcoat layer 6 contains the polyolefin having the above-described polar group, the overcoat layer 6 is excellent in flexibility, can suppress cracking of the vapor deposition layer 5 after bending, and is excellent in adhesion to the vapor deposition layer 5. Furthermore, by including the polyolefin having the above-described polar group in the overcoat layer 6, it is possible to obtain the moisture-proof cosmetic paper 10 and the back surface moisture-proof sheet 12 having excellent water vapor barrier properties.

[0062] The content of the polyolefin having a polar group in the overcoat layer 6 is, for example, 50% by mass or more, more preferably 70% by mass or more, even more preferably 90% by mass or more, and most preferably 100% by mass.

[0063] The overcoat layer 6 may contain other components in addition to the polyolefin having the above polar group. Examples of the other components include silane coupling agents, organic titanates, polyacryl, polyester, polyurethane, polycarbonate, polyurea, polyamide, polyolefin-based emulsions, polyimide, melamine, phenol, and the like.

[0064] The lower limit of the thickness of the overcoat layer 6 is, for example, 2 μm or more, more preferably 3 μm or more. The upper limit of the thickness of the overcoat layer 6 is, for example, 10 μm or less, more preferably 8 μm or less, and even more preferably 5 μm or less. Further, if the thickness of the overcoat layer 6 is 10 μm or less, the adhesion and barrier properties with the vapor deposition layer 5 can be sufficiently exhibited while suppressing the cost. Further, if the thickness of the overcoat layer 6 is 2 μm or more, the continuity of the overcoat layer 6 can be easily made sufficient.

[0065] The thickness of the overcoat layer 6 is preferably the same as the thickness of the anchor coat layer 4, but may be thinner or thicker than the thickness of the anchor coat layer 4.

[0066] As a method for providing the overcoat layer 6, for example, a method of applying a coating liquid containing the above-described polyolefin and a solvent onto the vapor deposition layer 5 and drying it can be mentioned. Examples of the solvent contained in the coating liquid for forming the overcoat layer 6 include water, methyl alcohol, ethyl alcohol, isopropyl alcohol, n-propyl alcohol, n-butyl alcohol, n-pentyl alcohol, dimethyl sulfoxide, dimethylformamide, dimethylacetamide, toluene, hexane, heptane, cyclohexane, acetone, methyl ethyl ketone, diethyl ether, dioxane, tetrahydrofuran, ethyl acetate, and butyl acetate. These solvents may be used alone or in combination of two or more. Among these, from the viewpoint of characteristics, methyl alcohol, ethyl alcohol, isopropyl alcohol, toluene, ethyl acetate, methyl ethyl ketone, and water are preferable. Also, from the environmental viewpoint, methyl alcohol, ethyl alcohol, isopropyl alcohol, and water are preferable.

[0067] The polyolefins having polar groups contained in the anchor coat layer 4 and the overcoat layer 6 may be of the same type or different types, but considering ease of production and the like, it is preferable that they are of the same type respectively. Further, the anchor coat layer 4 may be formed of a polyolefin having two or more polar groups, and the overcoat layer 6 may be formed of a polyolefin having one polar group.

[0068] Alternatively, the anchor coat layer 4 may be formed of a polyolefin having one polar group, and the overcoat layer 6 may be formed of a polyolefin having two or more polar groups. Even when the anchor coat layer 4 and the overcoat layer 6 are formed of different polyolefins from each other, the same effects as when they are formed of the same polyolefin can be obtained.

[0069] Further, the surface roughness (Ra) of the overcoat layer 6 is preferably in the range of 0.1 μm or more and 10 μm or less, more preferably in the range of 0.5 μm or more and 5 μm or less, and even more preferably in the range of 1 μm or more and 3 μm or less. If the surface roughness (Ra) of the overcoat layer 6 is within the above numerical range, the adhesiveness between the overcoat layer 6 and the adhesive primer layer 7 is improved due to the anchoring effect.

[0070] <Adhesive primer> The adhesive primer layer 7 is used when laminating and adhering to the surface of various adherend substrates, and is provided, for example, for the purpose of sufficiently ensuring the adhesiveness with various laminating adhesives such as isocyanate-curing type urethane resin-based and modified vinyl acetate resin emulsion-based adhesives. As its material, for example, various primer agents such as ester-based resins, urethane-based resins, acrylic-based resins, polycarbonate-based resins, vinyl chloride-vinyl acetate copolymers, polyvinyl butyral-based resins, and nitrocellulose-based resins are known, and those suitable for the type of laminating adhesive are selected and used from among these.

[0071] For example, when a modified vinyl acetate resin emulsion-based adhesive is used as the laminating adhesive, good adhesion can be obtained by using a urethane-based adhesive primer agent.

[0072] In addition, if an inorganic fine powder such as silica is added to the adhesive primer layer 7, the surface of the adhesive primer layer 7 becomes roughened, so that blocking during winding and storage of the moisture-proof decorative paper 10 and the back moisture-proof sheet 12 can be prevented, and the adhesiveness with the laminating adhesive due to the anchoring effect can also be improved. Further, these adhesive primer layers 7 can be used alone or in combination as an adhesive composition and formed by using an appropriate coating means such as a roll coating method or a gravure printing method.

[0073] Also, the surface roughness (Ra) of the primer layer 7 for adhesion is preferably in the range of 0.1 μm or more and 10 μm or less, more preferably in the range of 0.5 μm or more and 5 μm or less, and even more preferably in the range of 1 μm or more and 3 μm or less. If the surface roughness (Ra) of the primer layer 7 for adhesion is within the above numerical range, the adhesiveness between the primer layer 7 for adhesion and the laminating adhesive is improved due to the anchoring effect.

[0074] <Effect> The moisture-proof cosmetic paper 10 and the back moisture-proof sheet 12 of the present embodiment can have a lower moisture permeability (JIS Z 0208) than synthetic resin sheets such as vinyl chloride, polyethylene, and polypropylene, or moisture-proof sheets made of paper / polyethylene / paper. Therefore, it is possible to obtain a moisture-proof cosmetic paper and a back moisture-proof sheet having excellent moisture-proof performance. Further, by forming furniture 30 such as a door using the moisture-proof cosmetic board 21 and 22 using the moisture-proof cosmetic paper 10 and the back moisture-proof sheet 12, it is possible to obtain an effect of preventing warping of furniture such as a door. Specifically, by using the moisture-proof cosmetic paper 10 and the back moisture-proof sheet 12 for furniture 30 such as a door, furniture 30 having a moisture permeability of about 5 (g / m 2 ·24h) or less, which is said to have a high warping prevention effect, can be obtained.

[0075] Also, in the moisture-proof cosmetic paper 10 and the back moisture-proof sheet 12, the mass of the paper base material 3 is 50% by mass or more based on the total mass of the moisture-proof layer a2. Therefore, compared with conventional moisture-proof members such as synthetic resin sheets (90% by mass or more of plastic material) such as vinyl chloride, polyethylene, and polypropylene, or moisture-proof sheets made of paper / polyethylene / paper (50% by mass or more of plastic material), the mass (content rate) of the plastic used is small, so the plastic material used for the moisture-proof cosmetic paper and the back moisture-proof sheet can be sufficiently reduced.

[0076] Therefore, by forming moisture-proof decorative boards 21 and 22 using this moisture-proof cosmetic paper 10 and the back moisture-proof sheet 12, and forming furniture 30 such as doors using these moisture-proof decorative boards 21 and 22, the amount of plastic material used can be reduced. Further, the moisture-proof decorative boards 21 and 22 and the furniture 30 such as doors using this moisture-proof cosmetic paper 10 and the back moisture-proof sheet 12 have high moisture-proof performance and are composed of a wood material and a paper component, so they are also excellent in recyclability.

[0077] [Examples] The present invention will be described more specifically by way of examples below, but the present invention is not limited in any way by the following examples.

[0078] [Production of Moisture-Proof Cosmetic Paper] (Example 1) Paper with enhanced inter-ply strength (manufactured by Amma Special Paper Co., Ltd.) with a basis weight of 50 g / m 2 On one side, a solution of polyepoxy resin was coated with a bar coater and dried in an oven to form an anchor coat layer with a thickness of 3 μm. The solution was prepared by mixing 24 parts by mass of Maxceb C93AT (manufactured by Mitsubishi Gas Chemical Co., Inc.) and 2 parts by mass of Maxceb M-100 (manufactured by Mitsubishi Gas Chemical Co., Inc.) in 17 parts by mass of a mixed solvent of methanol and ethyl acetate at a 1:1 (mass ratio). Subsequently, SiOx with a thickness of 30 nm was deposited on the anchor coat layer to form a silica-deposited layer. On top of that, an aqueous dispersion of a polyolefin containing a carboxyl group salt (polar group-containing polyolefin) was coated with a bar coater and dried in an oven to form an overcoat layer with a thickness of 3 μm. Thereby, the moisture-proof paper according to Example 1 was obtained.

[0079] (Example 2) A moisture-proof paper according to Example 2 was obtained by the same operation as in Example 1, except that a urethane-cured acrylic resin (acrylic urethane resin), which is a cured product of an acrylic polyol and a polyisocyanate, was coated with a thickness of 1 μm as the anchor coat layer.

[0080] (Example 3) As the anchor coat layer, a moisture-proof paper according to Example 3 was obtained by the same operation as in Example 1, except that a urethane-cured acrylic resin (acrylic urethane resin), which is a cured product of acrylic polyol and polyisocyanate, was applied with a thickness of 3 μm.

[0081] (Example 4) A moisture-proof paper according to Example 4 was obtained by the same operation as in Example 1, except that the thickness of the silica vapor deposition layer was set to 10 nm.

[0082] (Example 5) A moisture-proof paper according to Example 5 was obtained by the same operation as in Example 1, except that the thickness of the silica vapor deposition layer was set to 100 nm.

[0083] (Example 6) A moisture-proof paper according to Example 6 was obtained by the same operation as in Example 1, except that the thickness of the silica vapor deposition layer was set to 10 nm and the thickness of the overcoat layer was set to 2 μm.

[0084] (Example 7) A moisture-proof paper according to Example 7 was obtained by the same operation as in Example 1, except that the thickness of the silica vapor deposition layer was set to 10 nm and the thickness of the overcoat layer was set to 10 μm.

[0085] (Comparative Example 1) On one side of the paper-to-paper reinforced paper, a coating solution in which a polyvinyl alcohol resin (PVA resin) with a saponification degree of 98% and a polymerization degree of 500 was dissolved in a solvent of water / IPA = 8 / 2 (mass ratio) was applied with a bar coater and dried in an oven to obtain an anchor coat layer with a thickness of 3 μm. Note that the silica vapor deposition layer and the overcoat layer were formed into a moisture-proof paper according to Comparative Example 1 by the same operation as in Example 1.

[0086] (Comparative Example 2) A moisture-proof paper according to Comparative Example 2 was obtained by the same operation as in Comparative Example 1, except that the thickness of the anchor coat layer was set to 6 μm.

[0087] (Comparative Example 3) A moisture-proof paper according to Comparative Example 3 was obtained by the same operation as in Comparative Example 1, except that the constituent resin of the anchor coat layer was a polyolefin containing a salt of a carboxyl group (polar group-containing polyolefin).

[0088] (Comparative Example 4) A moisture-proof paper according to Comparative Example 4 was obtained by the same operation as in Comparative Example 1, except that the constituent resin of the anchor coat layer was a polyolefin containing a salt of a carboxyl group (polar group-containing polyolefin) and its thickness was 6 μm.

[0089] <Measurement of local thermal analysis> [Measurement of softening temperature] The softening temperature of the resin layer (anchor coat layer) was measured by the method shown below.

[0090] The sample (moisture-proof paper provided only with the moisture-proof layer according to each Example and each Comparative Example) was cut with scissors into a strip shape with a bottom side of 1.0 mm × a height of 5.0 mm, embedded with a photocurable resin, and cured with a halogen lamp KTX-100R. D-800 manufactured by Toagosei Co., Ltd. was used as the photocurable resin. The test piece after photocuring was fixed with an insert for an AFM sample holder, and the cross-section of the film (sample) was cut with a glass knife at room temperature (25°C).

[0091] Thereafter, at room temperature, final cross-section cutting was performed with a diamond knife at a cutting speed of 2.0 mm / s and a cutting film thickness of 200 nm, and the cutting was terminated when a mirror surface was obtained. As the cross-section cutting device, an ultramicrotome (EM UC7 manufactured by Leica) and a cryosystem (Leica EM FC7) were used. Also, the cutting direction of the knife was perpendicular to the film thickness direction of the layer (sample). The test piece with the cross-section exposed was fixed with an insert for an AFM sample holder and used for measuring the softening temperature.

[0092] The atomic force microscope (AFM) used to measure the softening temperature was the MFP-3D-SA manufactured by Oxford Instruments Co., Ltd. The local thermal analysis option was the Zterm system, and the cantilever was the AN2-200 manufactured by Anasys Instruments with a spring constant of 0.5 to 3.5 N / m. The softening temperature measurement and shape measurement were performed.

[0093] With the contact pressure of the cantilever (change in the deflection amount of the cantilever) set at 2.0 V, the voltage application acceleration (heating rate) at 0.5 V / second, and the maximum applied voltage at 7.1 V, when the measurement surface, that is, the cross-section of the anchor coat layer, was heated after Detrend correction, the measurement surface expanded and the height of the cantilever increased. Furthermore, when the measurement surface was heated further, when the measurement surface softened and the height position of the cantilever decreased by 20 nm, the measurement was terminated. When the maximum applied voltage was reached without the height position decreasing by 20 nm from the change point, the maximum applied voltages at the time of Detrend correction and measurement were increased by 0.5 V and the measurement was performed again.

[0094] The applied voltage at the point where the height position of the cantilever in the vertical direction was maximum was read as the voltage value (applied voltage at the softening point) for calculating the softening temperature.

[0095] Next, in order to calculate the softening temperature of the anchor coat layer, a calibration curve was created. As calibration samples, polycaprolactone (melting point: 60 °C), low-density polyethylene (LDPE, melting point 112 °C), polypropylene (PP, melting point: 166 °C), and polyethylene terephthalate (PET, melting point 250 °C) were used. The contact pressure of the cantilever (change in the deflection amount of the cantilever) was set at 2.0 V, and the voltage application acceleration (heating rate) was set at 0.5 V / second. The measurement position of the calibration sample was changed and measured 10 times, and a calibration curve was created by approximating the average value of the applied voltage at the softening point and the melting point with a cubic function by the least squares method. At this time, an error of ±10 °C was considered as the error in the softening temperature.

[0096] Using the constitutive curve of the applied voltage and the melting point (melting peak temperature), the applied voltage at the softening point of the resin layer (anchor coat layer) was converted to temperature, and the softening temperature in this example was obtained. The results thus obtained are shown in Tables 1 to 3.

[0097] Next, on the surface opposite to the surface on which the moisture-proof layer a2 laminated on the paper substrate 3 was formed, a solid ink layer was formed by gravure printing using an ink with nitrocellulose and acrylic resin as binders. On top of that, a pattern ink layer (printed pattern layer 2) was also formed by gravure printing using an ink with nitrocellulose and acrylic resin as binders.

[0098] Subsequently, a surface protection layer (protective resin layer 1) was formed by gravure printing using urethane-based acrylic polyol and isocyanate, and moisture-proof decorative papers 10 of Examples 1 to 7 and Comparative Examples 1 to 4 were obtained.

[0099] <Production of Flash Door> (Example 8) In Example 1, a back surface moisture-proof sheet 12 having only the moisture-proof layer a2 on the paper substrate 3 was obtained without forming the printed pattern layer 2 and the surface protection layer (protective resin layer 1).

[0100] Using the moisture-proof layer a2 side of the moisture-proof decorative paper 10 obtained in Example 1 as the adhesive side, on the surface of the MDF board substrate S (manufactured by Hokushin Co., Ltd.: thickness: 3 mm), and using the moisture-proof layer a2 side of the back surface moisture-proof sheet 12 obtained in Example 8 as the adhesive side, on the back surface of the board substrate S, they were laminated via a vinyl acetate resin-based adhesive (manufactured by Konishi Co., Ltd.) (applied at 5 g / foot square in the wet state), and a moisture-proof decorative board 22 with warp prevention was obtained.

[0101] Next, on the front and back of a four-sided frame (core material SS) cored with LVL (Laminated Veneer Lumber, manufactured by First Wood Co., Ltd.: 27 mm × 26 mm), with the back surface moisture-proof sheet 12 side of the moisture-proof decorative board 22 facing the inside (four-sided frame side) respectively, a flash door (810 mm × 2030 mm) was manufactured using a vinyl acetate-based resin adhesive (manufactured by Konishi Co., Ltd.).

[0102] <Manufacture of Flash Door> (Comparative Example 5) As a moisture-proof sheet of a conventional product, the corona-treated surfaces of two sheets of paper-interleaved reinforced paper (manufactured by Amami Special Paper Co., Ltd.) with a basis weight of 30 g / m 2 were sand-laminated with 50 μm of molten polyethylene resin extruded from a T-die extruder to produce a moisture-proof sheet (paper-interleaved reinforced paper / polyethylene / paper-interleaved reinforced paper).

[0103] Next, on the front surface of the moisture-proof sheet, in the same procedure as in Example 1, a solid ink layer was formed by gravure printing using an ink with nitrocellulose and an acrylic resin as binders. On top of that, a pattern ink layer (printed pattern layer 2) was also formed by gravure printing using an ink with nitrocellulose and an acrylic resin as binders.

[0104] Subsequently, a surface protection layer (protective resin layer 1) was formed by gravure printing using a urethane-based acrylic polyol and isocyanate to obtain a moisture-proof decorative sheet of Comparative Example 5.

[0105] The moisture-proof decorative sheet obtained in Comparative Example 5 was laminated on the surface of an MDF board substrate S (manufactured by Hokushin Co., Ltd.: 3 mm), and the back surface moisture-proof sheet produced in the above-described process was laminated on the back surface of the board substrate S, respectively, via a vinyl acetate resin-based adhesive (manufactured by Konishi Co., Ltd.) (applied at 5 g / ft in the wet state) to obtain a moisture-proof decorative board with warp prevention.

[0106] Next, on the front and back of a four-sided frame (core material SS) cored with LVL (manufactured by First Wood Co., Ltd.: 27 mm × 26 mm), with the back surface moisture-proof sheet side of the moisture-proof decorative board facing inward (towards the four-sided frame) respectively, a flash door (810 mm × 2030 mm) was produced using a vinyl acetate resin-based adhesive (manufactured by Konishi Co., Ltd.).

[0107] <Manufacture of Flash Door> (Comparative Example 6) Basis weight 50 g / m 2On one side of the interleaf reinforced paper (manufactured by Amma Special Paper Co., Ltd.), a solid ink layer was formed by gravure printing using an ink with nitrocellulose and acrylic resin as binders in the same procedure as in Example 1. On top of that, in the same manner as in Example 1, a pattern ink layer (printed pattern layer 2) was formed by gravure printing using an ink with nitrocellulose and acrylic resin as binders.

[0108] Subsequently, a surface protection layer (protective resin layer 1) was formed by gravure printing using a urethane-based acrylic polyol and isocyanate to obtain the decorative paper of Comparative Example 6.

[0109] The decorative paper obtained in Comparative Example 6 was laminated on the surface of an MDF board substrate S (manufactured by Hokushin Co., Ltd.: 3 mm), and 2 the interleaf reinforced paper (manufactured by Amma Special Paper Co., Ltd.) with a basis weight of 50 g / m² was laminated on the back of the MDF via a vinyl acetate resin-based adhesive (manufactured by Konishi Co., Ltd.) (applied at 5 g / foot² in the wet state) to obtain the decorative board of Comparative Example 6.

[0110] Next, on the front and back of a four-sided frame (core material SS) cored with LVL (manufactured by First Wood Co., Ltd.: 27 mm × 26 mm), with the interleaf reinforced paper side of the decorative board facing inward (towards the four-sided frame side), a flush door (810 mm × 2030 mm) was fabricated using a vinyl acetate resin-based adhesive (manufactured by Konishi Co., Ltd.).

[0111] [Evaluation] <Evaluation 1> For each of the moisture-proof decorative papers of Examples 1 to 7 and Comparative Examples 1 to 4 prepared above, the water vapor transmission rate (moisture permeability) was calculated in accordance with JIS Z 0208, and the moisture permeabilities were compared. The results are shown in Tables 1 to 3.

[0112]

Table 1

[0113]

Table 2

[0114]

Table 3

[0115] As is clear from the results of Tables 1 to 3, the moisture-proof cosmetic papers of each example had lower moisture permeability (water vapor transmission rate) compared to the moisture-proof cosmetic papers of each comparative example. The moisture-proof cosmetic paper of this example was found to have improved performance in moisture permeability (water vapor transmission rate) by providing a moisture-proof layer, and it can be expected to have the effect of reducing the warping of the cosmetic board caused by moisture absorption and desorption due to changes in temperature and humidity indoors compared to conventional products, and the effect of reducing the usage amount of plastic materials.

[0116] <Evaluation 2>

[0117] For the flash doors manufactured in Example 8 and Comparative Examples 5 and 6, a warping test was conducted in a two-room one-body environmental test chamber. As a test method, the flash door was installed at the boundary between the two rooms, with one side in a high-humidity environment and the other side in a low-humidity environment, and the warping amount of the flash door was measured. As for the details of the test method, the environment on the high-humidity side was set to a humidity of 90% ± 5% and a temperature of 20°C, and the environment on the low-humidity side was set to a humidity of 50% ± 5% and a temperature of 20°C, and left standing for 8 hours. Then, both rooms were left standing in an environment of humidity 50% ± 5% and temperature 20°C for 16 hours. Taking these 24 hours as one cycle, humidification was repeated 5 cycles. At this time, the maximum displacement amounts in the vertical, horizontal, and diagonal directions of the flash door were measured. The results are shown in Table 4.

[0118]

Table 4

[0119] From the results of Table 4, it was confirmed that the flash door of Example 8 had a smaller maximum displacement amount in all cases of the height direction, width direction, and diagonal direction compared to each flash door of Comparative Examples 5 and 6.

[0120] From Tables 1 to 4, it was verified that it is possible to provide a moisture-proof decorative board and fixtures such as doors that can prevent warping even when using a decorative board or the like in a place where there is a large difference in the temperature and humidity environment on both sides (the front side and the back side) of the decorative board or the like, which is an object of the present invention.

[0121] Also, for example, the present invention can have the following configurations. (1) A moisture-proof decorative paper having a decorative layer and a moisture-proof layer, wherein the decorative layer includes a paper base material, a printed pattern layer, and a protective resin layer in this order on one surface of the paper base material, the moisture-proof layer includes an anchor coat layer, a silica vapor deposition layer, and an overcoat layer in this order on the other surface of the paper base material, the anchor coat layer and the overcoat layer are each in direct contact with the silica vapor deposition layer, and the softening temperature of the anchor coat layer measured by local thermal analysis in the cross-section in the thickness direction of the moisture-proof decorative paper is 180°C or higher. The moisture-proof decorative paper is characterized by this. (2) A moisture-proof decorative paper including a paper base material, a decorative layer on one surface of the paper base material, and a moisture-proof layer on the other surface of the paper base material in this order, wherein the decorative layer includes a printed pattern layer and a protective resin layer in this order on one surface of the paper base material, the moisture-proof layer includes an anchor coat layer, a silica vapor deposition layer, and an overcoat layer in this order on the other surface of the paper base material, and the anchor coat layer has at least one of an epoxy resin, an acrylic urethane resin, an acrylic resin, a polyester-based polyurethane resin, and a polyether-based polyurethane resin. The moisture-proof decorative paper is characterized by this. (3) The moisture-proof decorative paper according to the above (1) or (2), characterized in that the overcoat layer contains a polyolefin having at least one polar group. (4) The moisture-proof cosmetic paper according to any one of (1) to (3) above, wherein the thickness of the silica vapor deposition layer is in the range of 10 nm or more and 100 nm or less. (5) The moisture-proof cosmetic paper according to any one of (1) to (4) above, wherein the thickness of the overcoat layer is in the range of 2 μm or more and 10 μm or less. (6) The moisture-proof cosmetic paper according to any one of (1) to (5) above, wherein the mass of the paper component contained in the paper base material is 50% by mass or more based on the mass of the entire moisture-proof cosmetic paper. (7) The moisture-proof cosmetic paper according to any one of (1) to (6) above, wherein the paper base material is paper-interlayer reinforced paper. (8) The surface on the overcoat layer side of the moisture-proof cosmetic paper according to any one of (1) to (7) above is adhered to one surface of a board base material, and a back surface moisture-proof sheet having a moisture permeability of 5 (g / m 2 ·24 h) or less is adhered to the other surface of the board base material. A moisture-proof cosmetic board characterized by this. (9) The moisture-proof cosmetic board according to (8) above, wherein the back surface moisture-proof sheet includes a paper base material, an anchor coat layer, a silica vapor deposition layer, and an overcoat layer in this order. (10) The fitting characterized in that the surface on the back surface moisture-proof sheet side of the moisture-proof cosmetic board according to (8) or (9) above is adhered to the front surface and the back surface of a wood-based core member, respectively.

[0122] 1 ··· Protective resin layer (surface protective layer) 2 ··· Printed pattern layer 3 ··· Paper base material 4 ··· Anchor coat layer 5 ··· Silica vapor deposition layer (vapor deposition layer) 6 ··· Overcoat layer 7 ··· Adhesive primer layer 10 ·· Moisture-proof cosmetic paper 11 ·· Back surface moisture-proof sheet 12 ·· Back surface moisture-proof sheet 21··Moisture-proof cosmetic board 22··Moisture-proof cosmetic board 30··Furniture a1··Cosmetic layer (cosmetic paper) a2··Moisture-proof layer S···Board substrate SS··Core material

Claims

1. A moisture-proof cosmetic paper comprising a cosmetic layer and a moisture-proof layer, wherein the cosmetic layer comprises a paper substrate, a printed pattern layer, and a protective resin layer in this order on one surface of the paper substrate; the moisture-proof layer comprises an anchor coat layer, a silica vapor deposition layer, and an overcoat layer in this order on the other surface of the paper substrate; the anchor coat layer and the overcoat layer are each in direct contact with the silica vapor deposition layer; a moisture-proof cosmetic paper characterized in that the softening temperature of the anchor coat layer measured by local thermal analysis is 180°C or higher.

2. A moisture-proof cosmetic paper comprising a paper substrate, a cosmetic layer on one surface of the paper substrate, and a moisture-proof layer on the other surface of the paper substrate in this order, wherein the cosmetic layer comprises a printed pattern layer and a protective resin layer in this order on one surface of the paper substrate; the moisture-proof layer comprises an anchor coat layer, a silica vapor deposition layer, and an overcoat layer in this order on the other surface of the paper substrate, and the anchor coat layer has at least one of an epoxy resin, an acrylic urethane resin, an acrylic resin, a polyester-based polyurethane resin, and a polyether-based polyurethane resin.

3. The moisture-proof cosmetic paper according to claim 1 or 2, wherein the overcoat layer contains a polyolefin having at least one polar group.

4. The moisture-proof cosmetic paper according to claim 1 or 2, wherein the thickness of the silica vapor deposition layer is in the range of 10 nm or more and 100 nm or less.

5. The moisture-proof cosmetic paper according to claim 1 or 2, wherein the thickness of the overcoat layer is in the range of 2 μm or more and 10 μm or less.

6. The moisture-proof cosmetic paper according to claim 1 or 2, wherein the mass of the paper component contained in the paper substrate is 50% by mass or more based on the total mass of the moisture-proof cosmetic paper.

7. The moisture-proof cosmetic paper according to claim 1 or 2, wherein the paper substrate is an inter-ply reinforced paper.

8. The surface on the overcoat layer side of the moisture-proof cosmetic paper according to claim 1 or 2 is adhered to one surface of the board base material, and the moisture permeability is 5 (g / m ２ ・24 h) or less, and a back moisture-proof sheet is adhered to the other surface of the board base material. A moisture-proof cosmetic board characterized by this.

9. The moisture-proof cosmetic board according to claim 8, wherein the back surface moisture-proof sheet comprises a paper substrate, an anchor coat layer, a silica vapor deposition layer, and an overcoat layer in this order.

10. A fitting characterized in that the surface on the side of the back surface moisture-proof sheet of the moisture-proof cosmetic board according to claim 9 is adhered to the front and back surfaces of a wood-based core member, respectively.

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