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 comprises a moisture-proof layer a1 and a decorative layer a2 in this order on one surface of a paper base material 1, wherein the moisture-proof layer a1 includes an anchor coat layer 2, a silica vapor-deposited layer 3 and an overcoat layer 4 in this order on the one surface of the paper base material 1, the decorative layer a2 includes a printed pattern layer 5 and a protective resin layer 6 in this order on the moisture-proof layer a1, and wherein the anchor coat layer 2 and the overcoat layer 4 are each brought into direct contact with the silica vapor-deposited layer 3, and in a cross section in a thickness direction of the moisture-proof decorative paper 10, a softening temperature of the anchor coat layer 2 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 fittings such as interior doors, kitchen doors, storage doors, and closets, a moisture-proof decorative board using the same, and fittings such as doors. Specifically, it relates to 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 fittings such as doors using the same.

Background Art

[0002] Conventionally, in fittings 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 bias occurs in the moisture content distribution inside the wooden fittings due to the occurrence of a humidity difference and a temperature difference between the inside and outside of the room. That is, when a humidity difference occurs, a difference occurs in the amount of moisture absorption and desorption on the front and back surfaces of the wooden fittings. 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. In addition, when a temperature difference occurs, the moisture contained in the wooden base material moves to the cold side, so a gradient of moisture content is formed in the thickness direction, resulting in warping. Usually, the low-temperature side often has high humidity and high moisture content. In this case, since the above 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 has been 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 board substrate such as plywood via an adhesive, and on the back surface side of the board substrate, 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 facing materials of the flush door, since the moisture-proof sheet and the moisture-proof back sheet adhered to the front and back of the board substrate have a high moisture-proof function, the change in the moisture content of the board substrate 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 supposed to exhibit a warping prevention 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 substrate 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 substrate is generally selected, and it is technically difficult to obtain high moisture-proof performance using a paper substrate. 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 on the rise. From the perspective of reducing the usage 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-made barrier material in which an anchor coat layer, a vapor deposition layer, and an overcoat layer are provided in this order on a paper base material 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 base material 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 desired 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 wood base material and the plastic part (synthetic resin layer or synthetic resin base material), and it is often not suitable for recycling.

[0009] In recent years, in consideration of the environmental aspect, the development of gas barrier materials using paper as a base material without using synthetic resin films and the like has been promoted. However, when stretching wrinkles or using a crimping method such as ironing during the handling of the material, there is a problem that cracks occur in the barrier layer and the gas barrier property deteriorates.

[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 the vapor-deposited 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-mentioned unsolved problems, and aims to provide a moisture-proof decorative paper capable of reducing the amount of plastic used and 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 (the front side and the 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 decorative paper comprising a paper base material, an anchor coat layer, a silica vapor deposition layer, and an overcoat layer in this order, wherein 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 decorative paper, the softening point of the anchor coat layer measured by local thermal analysis is 180°C or higher. That is, the moisture-proof decorative paper according to one aspect of the present invention is a moisture-proof decorative paper comprising a paper base material, a moisture-proof layer, and a decorative layer, wherein on one surface of the paper base material, the moisture-proof layer and the decorative layer are provided in this order, the moisture-proof layer comprises an anchor coat layer, a silica vapor deposition layer, and an overcoat layer in this order on one surface of the paper base material, and the decorative layer comprises a printed pattern layer and a protective resin layer in this order on the moisture-proof layer.

[0013] Further, according to another aspect of the present invention, the moisture-proof cosmetic paper of the above aspect is adhered with the paper base material 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, and a moisture-proof decorative board is provided. That is, in the moisture-proof decorative board according to one aspect of the present invention, the surface on the paper base material 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 warp prevention, which includes a wood-based core member in which the moisture-proof decorative board of the above aspect is pressure-bonded so 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 cosmetic paper, a moisture-proof decorative board, and a fixture that can more effectively prevent 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

Figure 7

Mode 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. 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 cosmetic paper 10 according to the present embodiment is formed by laminating a paper base material 1, an anchor coat layer 2, a vapor deposition layer (silica vapor deposition layer) 3, an overcoat layer 4, a printed pattern layer 5, and a protective resin layer 6 in this order. The anchor coat layer 2 contains at least one resin selected from the group consisting of, for example, an acrylic resin, an epoxy resin, an acrylic urethane resin, a polyester-based polyurethane resin, and a polyether-based polyurethane resin. In the present embodiment, the anchor coat layer 2, the vapor deposition layer (silica vapor deposition layer) 3, and the overcoat layer 4 constitute a moisture-proof layer a1, and the printed pattern layer 5 and the protective resin layer 6 constitute a decorative layer a2. Note that the anchor coat layer 2 and the overcoat layer 4 may be in direct contact with the vapor deposition layer (silica vapor deposition layer) 3, respectively.

[0019] FIG. 2 is a schematic cross-sectional view showing an example of the moisture-proof decorative board 21. The moisture-proof decorative board 21 includes a board substrate S, a moisture-proof decorative paper 10 provided on one surface of the board substrate S, and a back moisture-proof sheet 11 provided on the other surface of the board substrate S. The moisture-proof decorative paper 10 is provided such that the paper substrate 1 is in contact with one surface of the board substrate S. The back moisture-proof sheet 11 is preferably a back 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 ·24 h or less of the back moisture-proof sheet is preferred, and 3 g / m 2 ·24 h or less of the back moisture-proof sheet is more preferred.

[0020] For example, as the back moisture-proof sheet 11, a moisture-proof sheet having a metal vapor deposition film and a coating layer on a synthetic resin substrate can be used. However, in terms of the environment of reducing the use amount of plastic, a moisture-proof sheet having a moisture-proof layer on a paper substrate is preferred.

[0021] As the back moisture-proof sheet 11, as shown in the moisture-proof decorative board 22 of FIG. 3 and the moisture-proof decorative board 23 of FIG. 4, a back moisture-proof sheet 12 having a moisture-proof layer with characteristics equivalent to the moisture-proof layer a1 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 2, a vapor deposition layer (silica vapor deposition layer) 3, and an overcoat layer 4 on the paper substrate 1 in this order. The paper substrate 1 may be provided in contact with the board substrate S (FIG. 3), or the overcoat layer 4 may be provided in contact with the board substrate S (FIG. 4). It is also possible to provide an adhesive primer layer (not shown) on the surface of the overcoat layer 4, that is, the surface opposite to the vapor deposition layer (silica vapor deposition layer) 3.

[0022] As shown in FIGS. 2 to 4, by adhering the moisture-proof cosmetic paper 10 to the surface (one side) of the board substrate S and adhering the back moisture-proof sheet 11 or the back moisture-proof sheet 12 to the back surface (the other side) of the board substrate S via an adhesive, moisture-proof decorative boards 21, 22, 23 with warping prevention can be obtained. Note that as the board substrate S used in this embodiment, a wood-based board substrate such as medium-density fiberboard (MDF), plywood, or particle board can be used.

[0023] FIGS. 5 to 7 schematically show a part of a fitting 30 such as a flush door in which the moisture-proof decorative boards 21, 22, 23 shown in FIGS. 2 to 4 are used on the front and back for flush processing. The fitting 30 shown in FIGS. 5 to 7 is formed by pressing the back moisture-proof sheet 11 or the back moisture-proof sheet 12 constituting the moisture-proof decorative board 21 (FIG. 5), the moisture-proof decorative board 22 (FIG. 6), or the moisture-proof decorative board 23 (FIG. 7) against the front and back surfaces of the wood-based core member SS with the inner side (the core member SS side) using an adhesive. In this way, a fitting 30 such as a flush door with warping prevention is formed.

[0024] Note that FIG. 5 shows a form using a pair of moisture-proof decorative boards 21, FIG. 6 shows a form using a pair of moisture-proof decorative boards 22, and FIG. 7 shows a form using a pair of moisture-proof decorative boards 23. However, in this embodiment, the moisture-proof decorative board 21 and the moisture-proof decorative board 22 can be used as a pair of moisture-proof decorative boards, and the moisture-proof decorative board 21 and the moisture-proof decorative board 23 can also be used as a pair of moisture-proof decorative boards. Of course, the moisture-proof decorative board 22 and the moisture-proof decorative board 23 can also be used as a pair of moisture-proof decorative boards.

[0025] 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, and in the case of a flush door, a core material such as a honeycomb panel can also be used as the core member SS.

[0026] 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.

[0027] Next, the configuration of each layer will be described. <Paper base material 1> The paper base material 1 is not particularly limited, and it may be appropriately selected according to the uses of the moisture-proof decorative paper 10 and the back moisture-proof sheet 12 to which it is applied. Specific examples of the paper base material 1 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, etc. Preferably, tissue paper (so-called paper-interlayer reinforced paper) obtained by co-papering a synthetic resin with a paper component (for example, cellulose fiber) to strengthen the inter-paper strength, or a paper impregnated with latex or synthetic resin is preferably used.

[0028] The basis weight of the paper base material 1 is not particularly limited, but when the basis weight of the paper base material 1 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 1 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 1 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.

[0029] Furthermore, for these paper base materials 1, 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 1 constituting the back moisture-proof sheet 12 is preferably the same as that of the paper base material 1 constituting the moisture-proof tissue paper 10, but it may be larger than that of the paper base material 1 constituting the moisture-proof tissue paper 10, or it may be smaller than that of the paper base material 1 constituting the moisture-proof tissue paper 10. For example, the basis weight of the paper base material 1 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 1 constituting the moisture-proof tissue paper 10. Alternatively, the basis weight of the paper base material 1 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 1 constituting the moisture-proof tissue paper 10.

[0030] <Coat layer> A coat layer (not shown) may be provided on the surface of the paper base material 1 on the side in contact with the anchor coat layer 2 described later. By providing the coat layer, it is possible to prevent the anchor coat layer 2 from penetrating into the paper base material 1, and it can also serve as a caulking to fill the unevenness on the surface of the paper base material 1. Therefore, for the paper base material 1 provided with a coat layer on the surface, the anchor coat layer 2 can be uniformly formed into a film without defects such as coating unevenness. The coat 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), etc. Further, the coat layer may contain, as a filler, for example, clay, kaolin, calcium carbonate, talc, mica, etc.

[0031] The thickness of the coat 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. Also, the surface roughness (Ra) of the coat 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 coat layer is within the above numerical range, the adhesiveness between the paper base material 1 and the anchor coat layer 2 is improved by the anchoring effect.

[0032] The mass of the paper base material 1 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 1 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, polypropylene, etc. or a moisture-proof sheet made of paper / polyethylene / paper (although it depends on the thickness of polyethylene, in order to have moisture-proof performance, 50% by mass or more is polyethylene), etc., since the amount of plastic used is small, the proportion of the plastic material contained in the moisture-proof cosmetic paper can be sufficiently reduced. Further, since 50% by mass or more is a paper material, the moisture-proof cosmetic paper 10 and the back surface moisture-proof sheet 12 according to the present embodiment can be said to be made of paper (indicating that it is "made of paper").

[0033] Also, the mass of the paper component contained in the paper base material 1 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 surface moisture-proof sheet 12.

[0034] <Anchor coat layer> The anchor coat layer 2 is a layer provided on the surface of the paper base material 1 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 2 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.

[0035] Also, the anchor coat layer 2 is a layer provided on the surface of the paper base material 1 and may contain a resin having at least one kind of polar group, or may contain a polyolefin having at least one kind of polar group. Further, the anchor coat layer 2 may contain a polyvinyl alcohol-based resin.

[0036] The total content of the resin having a polar group (for example, polyolefin having a polar group) in the anchor coat layer 2 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 2.

[0037] 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. Alternatively, those copolymerized with vinyl acetate, epoxy compounds, chlorine compounds, urethane compounds, polyamide compounds, etc. may also be used.

[0038] Specific examples include copolymers of acrylic acid ester and maleic anhydride, ethylene-vinyl acetate copolymers, ethylene-glycidyl methacrylate copolymers, and the like.

[0039] 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 liquid of the polyvinyl alcohol-based resin described later will be low and the coatability will be good.

[0040] The anchor coat layer 2 may contain other components in addition to the polyolefin having the above polar group and the polyvinyl alcohol-based resin. Examples of the other components include resins such as polyolefins other than the polyolefin having the above 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.

[0041] The anchor coat layer 2 is provided to improve the adhesion to the paper base material 1 and to improve the gas barrier properties of the moisture-proof cosmetic paper 10 and the back moisture-proof sheet 12. By including a resin having at least one kind of polar group in the anchor coat layer 2, the moisture-proof cosmetic paper 10 and the back moisture-proof sheet 12 are excellent in gas barrier properties. By including a polyvinyl alcohol-based resin, they are even more excellent in water vapor barrier properties and oxygen barrier properties. By including a polyolefin, it is possible to form a dense film due to the crystallinity of the polyolefin, and the water vapor barrier property is exhibited.

[0042] The lower limit of the thickness of the anchor coat layer 2 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 2 is 1 μm or more, the vapor deposition layer 3 can be laminated uniformly. The thicker the anchor coat layer 2, the more efficiently the unevenness of the paper base material 1 can be filled, and the vapor deposition layer 3 can be laminated more uniformly. Also, if the thickness of the anchor coat layer 2 is 20 μm or less, each of the above layers can be laminated uniformly while suppressing the cost.

[0043] The softening temperature measured by local thermal analysis in the anchor coat layer 2 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 2 is 180°C or higher, it is possible to suppress a decrease in the density of the vapor deposition layer 3. The higher the softening temperature, the more it is possible to reduce the softening and elongation of the anchor coat layer 2 due to the heat of the vapor deposition material such as SiOx particles during vapor deposition, so it is possible to further suppress the occurrence of macro cracks in the vapor deposition layer (silica vapor deposition layer) 3 and a decrease in the density of the vapor deposition layer 3.

[0044] Incidentally, the adjustment of the softening temperature of the anchor coat layer 2 can be performed by adjusting the constituent materials of the anchor coat layer 2 and the ratio of the resin to be combined. Further, the softening temperature measured by the local thermal analysis method in the anchor coat layer 2 is more preferably 180°C or higher in the cross section in the thickness direction of the moisture-proof tissue paper 10. Thus, the softening temperature measured by the local thermal analysis method in the anchor coat layer 2 is preferably 180°C or higher regardless of the measurement location, and more preferably the softening temperature measured in the cross section in the thickness direction of the moisture-proof tissue paper 10 is 180°C or higher.

[0045] As a method for providing the anchor coat layer 2, for example, a method of applying a coating liquid containing the constituent materials and solvent of the anchor coat layer 2 described above onto the paper base material 1 and drying it can be mentioned. Examples of the solvent contained in the coating liquid for forming the anchor coat layer 2 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.

[0046] Further, the surface roughness (Ra) of the anchor coat 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 anchor coat layer 2 is within the above numerical range, the adhesiveness between the anchor coat layer 2 and the vapor deposition layer 3 is improved due to the anchoring effect. Therefore, the frequency of cracks or the like occurring in the vapor deposition layer 3 can be reduced, and excellent gas barrier properties can be imparted.

[0047] <Vapor deposition layer> The vapor deposition layer 3 is a layer formed by vapor depositing silica which is an inorganic compound, and may contain silicon oxide (SiOx) or the like. Further, the vapor deposition layer 3 may be provided on the surface of the anchor coat layer 2 so as to be in contact with the anchor coat layer 2.

[0048] The thickness of the vapor deposition layer 3 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 3 is preferably 100 nm or less, more preferably 80 nm or less. By setting the thickness of the vapor deposition layer 3 to 10 nm or more, it is easy to make the continuity of the vapor deposition layer 3 sufficient. By setting it to 100 nm or less, curling in the moisture-proof tissue paper 10 and the back moisture-proof sheet 12 and the occurrence of cracks in the vapor deposition layer 3 can be sufficiently suppressed, and sufficient gas barrier performance and flexibility can be easily achieved.

[0049] The vapor deposition layer 3 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 method, sputtering method, and chemical vapor deposition method (CVD method) can be used as the film-forming means. Among them, 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 rise and fall of the vapor deposition material can be performed in a short time.

[0050] Also, the surface roughness (Ra) of the vapor deposition layer 3 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 3 is within the above numerical range, the adhesion between the vapor deposition layer 3 and the overcoat layer 4 is improved due to the anchoring effect. Therefore, the frequency of cracks and the like occurring in the vapor deposition layer 3 can be reduced, and excellent gas barrier properties can be imparted.

[0051] <Overcoat layer> The overcoat layer 4 is provided on the surface of the vapor deposition layer 3 so as to be in contact with the vapor deposition layer 3. The overcoat layer 4 may contain, for example, a polyolefin having at least one kind of polar group.

[0052] 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 acrylic acid ester and maleic anhydride, an ethylene-vinyl acetate copolymer, an ethylene-glycidyl methacrylate copolymer, etc. may be used.

[0053] Since the overcoat layer 4 contains the polyolefin having the polar group described above, the overcoat layer 4 is excellent in flexibility, can suppress cracking of the vapor deposition layer 3 after bending, and is excellent in adhesion to the vapor deposition layer 3. Furthermore, since the overcoat layer 4 contains the polyolefin having the polar group described above, a moisture-proof cosmetic paper 10 and a back surface moisture-proof sheet 12 excellent in water vapor barrier properties can be obtained.

[0054] The content of the polyolefin having a polar group in the overcoat layer 4 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.

[0055] The overcoat layer 4 may contain other components in addition to the polyolefin having the 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.

[0056] The lower limit of the thickness of the overcoat layer 4 is, for example, 2 μm or more, more preferably 3 μm or more. The upper limit of the thickness of the overcoat layer 4 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 4 is 10 μm or less, the adhesion and barrier properties with the vapor deposition layer 3 can be sufficiently exhibited while suppressing the cost. Further, if the thickness of the overcoat layer 4 is 2 μm or more, the continuity of the overcoat layer 4 can be easily made sufficient.

[0057] The thickness of the overcoat layer 4 is preferably the same as the thickness of the anchor coat layer 2, but may be thinner or thicker than the thickness of the anchor coat layer 2.

[0058] As a method for providing the overcoat layer 4, for example, a method of applying a coating liquid containing the above-described polyolefin and a solvent onto the vapor deposition layer 3 and drying it can be mentioned. Examples of the solvent contained in the coating liquid for forming the overcoat 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 viewpoint of properties, methyl alcohol, ethyl alcohol, isopropyl alcohol, toluene, ethyl acetate, methyl ethyl ketone, and water are preferable. Also, from the viewpoint of the environment, methyl alcohol, ethyl alcohol, isopropyl alcohol, and water are preferable.

[0059] The polyolefins having polar groups contained in the anchor coat layer 2 and the overcoat layer 4 may be of the same type or different types, but considering the ease of production and the like, it is preferable that they are of the same type. Further, the anchor coat layer 2 may be formed of a polyolefin having two or more polar groups, and the overcoat layer 4 may be formed of a polyolefin having one polar group. Alternatively, the anchor coat layer 2 may be formed of a polyolefin having one polar group, and the overcoat layer 4 may be formed of a polyolefin having two or more polar groups. Even when the anchor coat layer 2 and the overcoat layer 4 are formed of different polyolefins from each other, the same effects as those when they are formed of the same polyolefin can be obtained.

[0060] Further, the surface roughness (Ra) of the overcoat 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 overcoat layer 4 is within the above numerical range, the adhesiveness between the overcoat layer 4 and the printed pattern layer 5 is improved due to the anchoring effect.

[0061] <printed pattern layer> The printed pattern layer 5 is for imparting design properties, and any pattern can be used as the pattern. As the pattern of the printed pattern layer 5, 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 printed pattern layer 5 and the overcoat layer 4 to ensure concealment. These printing methods are not particularly limited, and known printing methods such as gravure printing, offset printing, silk screen printing, and inkjet printing can be used.

[0062] There is no particular limitation on the printing ink or the like, and there is no particular problem with either oil-based or water-based. The printing ink or the like used for the printed pattern layer 5 can be the same as the printing ink or the like used for the printed 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 with an acrylic polyol-based vehicle can be used.

[0063] In addition, the surface roughness (Ra) of the printed pattern 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 printed pattern layer 5 is within the above numerical range, the adhesiveness between the printed pattern layer 5 and the protective resin layer 6 is improved due to the anchoring effect.

[0064] <protective resin layer> The protective resin layer 6 that functions as a surface protective layer is a layer for protecting the surface of the moisture-proof tissue 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 tissue paper 10, the moisture-proof decorative boards 21, 22, 23, and the fixtures 30 such as doors. The formation of the protective resin layer (surface protective layer) 6 is not particularly limited, and it can be formed by a known coating method such as gravure coating.

[0065] There is no particular limitation on the material of the protective resin layer (surface protective layer) 6, and the same materials as those used as the surface protective layer in conventional tissue paper can be used. As the material that can be used for the protective resin layer (surface protective layer) 6, for example, acrylic urethane resins and radiation-curable resins can be used. As the acrylic urethane resin, for example, a reaction product mainly composed of an acrylic polyol compound and an isocyanate compound as a curing agent can be adopted. Further, as the radiation-curable resin, for example, a composition mainly composed of at least any one of prepolymers, oligomers, and monomers having a polymerizable unsaturated bond such as a (meth)acryloyl group having a property of undergoing a crosslinking reaction by irradiation with ionizing radiation such as electron beams or ultraviolet rays can be adopted.

[0066] The protective resin layer (surface protective layer) 6 may be a single layer or a multi-layer of two or three layers. When the protective resin layer 6 is a multi-layer, a gloss-matte expression can also be imparted by separately coating a matte resin and a gloss resin. Further, an uneven expression with the resin partially raised can also be imparted. Furthermore, an antibacterial agent, an antiviral agent, etc. can also be added.

[0067] <Effect> The moisture-proof cosmetic paper 10 and the back moisture-proof sheet 12 of this embodiment can have a lower moisture permeability (JIS Z 0208) compared to a synthetic resin sheet such as vinyl chloride, polyethylene, polypropylene, or a moisture-proof sheet made of paper / polyethylene / paper. Therefore, a moisture-proof cosmetic paper and a back moisture-proof sheet with excellent moisture-proof performance can be obtained. Further, by forming furniture 30 such as a door using the moisture-proof cosmetic boards 21, 22, 23 using this moisture-proof cosmetic paper 10 and the back moisture-proof sheet 12, an effect of preventing warping of the furniture such as a door can be obtained. Specifically, by using this moisture-proof cosmetic paper 10 and the back moisture-proof sheet 12 for furniture 30 such as a door, furniture 30 with 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.

[0068] Also, in the moisture-proof cosmetic paper 10 and the back moisture-proof sheet 12, the mass of the paper base material 1 is 50% by mass or more based on the total mass of the moisture-proof layer a1. Therefore, compared to conventional moisture-proof members such as a synthetic resin sheet (90% by mass or more of plastic material) such as vinyl chloride, polyethylene, polypropylene, or a moisture-proof sheet 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.

[0069] Therefore, by forming the moisture-proof cosmetic boards 21, 22, 23 using this moisture-proof cosmetic paper 10 and the back moisture-proof sheet 12, and forming furniture 30 such as a door using these moisture-proof cosmetic boards 21, 22, 23, the amount of plastic material used can be reduced. Further, the moisture-proof cosmetic boards 21, 22, 23 and the furniture 30 such as a door 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.

[0070] [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.

[0071] <Production of Moisture-Proof Cosmetic Paper> (Example 1) Paper with a basis weight of 50 g / m 2 On one side of the paper with enhanced intersheet strength (manufactured by Tenma Tokushu Seishi Co., Ltd.), 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 Maxceeve C93AT (manufactured by Mitsubishi Gas Chemical Company) and 2 parts by mass of Maxceeve M-100 (manufactured by Mitsubishi Gas Chemical Company) in 17 parts by mass of a mixed solvent of methanol and ethyl acetate in a 1:1 (mass ratio). Subsequently, SiOx was deposited to a thickness of 30 nm 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.

[0072] (Example 2) The moisture-proof paper according to Example 2 was obtained by the same operations 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.

[0073] (Example 3) The moisture-proof paper according to Example 3 was obtained by the same operations 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 3 μm as the anchor coat layer.

[0074] (Example 4) The moisture-proof paper according to Example 4 was obtained by the same operations as in Example 1, except that the thickness of the silica-deposited layer was set to 10 nm.

[0075] (Example 5) The moisture-proof paper according to Example 5 was obtained by the same operations as in Example 1, except that the thickness of the silica-deposited layer was set to 100 nm.

[0076] (Example 6) A moisture-proof paper according to Example 6 was obtained by the same operations as in Example 1, except that the thickness of the silica vapor deposition layer was 10 nm and the thickness of the overcoat layer was 2 μm.

[0077] (Example 7) A moisture-proof paper according to Example 7 was obtained by the same operations as in Example 1, except that the thickness of the silica vapor deposition layer was 10 nm and the thickness of the overcoat layer was 10 μm.

[0078] (Comparative Example 1) 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 to one side of the paper interlayer reinforcing paper with a bar coater and dried in an oven to obtain an anchor coat layer with a thickness of 3 μm. Note that a moisture-proof paper according to Comparative Example 1 was formed by the same operations as in Example 1 for the silica vapor deposition layer and the overcoat layer.

[0079] (Comparative Example 2) A moisture-proof paper according to Comparative Example 2 was obtained by the same operations as in Comparative Example 1, except that the thickness of the anchor coat layer was 6 μm.

[0080] (Comparative Example 3) A moisture-proof paper according to Comparative Example 3 was obtained by the same operations as in Comparative Example 1, except that the constituent resin of the anchor coat layer was a polyolefin containing a carboxyl group salt (polar group-containing polyolefin).

[0081] (Comparative Example 4) A moisture-proof paper according to Comparative Example 4 was obtained by the same operations as in Comparative Example 1, except that the constituent resin of the anchor coat layer was a polyolefin containing a carboxyl group salt (polar group-containing polyolefin) and its thickness was 6 μm.

[0082] <Measurement of local thermal analysis> [Softening temperature measurement] The softening temperature of the resin layer (anchor coat layer) was measured by the method shown below.

[0083] The sample (the moisture-proof paper having only the moisture-proof layer according to each example and each comparative example) was cut into a strip shape with a bottom side of 1.0 mm × a height of 5.0 mm using scissors, 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).

[0084] 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 cryo system (EM FC7 manufactured by Leica) were used. Also, the cutting direction of the knife was perpendicular to the film thickness direction of the layer (sample). The cross-sectioned test piece was fixed with an insert for an AFM sample holder and used for measuring the softening temperature.

[0085] The atomic force microscope (AFM) used for measuring the softening temperature was MFP-3D-SA manufactured by Oxford Instruments Co., Ltd., the local thermal analysis option was the Zterm system, and the cantilever was AN2-200 manufactured by Anasys Instruments Co., Ltd. with a spring constant of 0.5 to 3.5 N / m. The softening temperature measurement and the shape measurement were performed.

[0086] When the contact pressure of the cantilever (the change amount of the deflection amount of the cantilever) was 2.0 V, the voltage application acceleration (heating rate) was 0.5 V / second, and the maximum applied voltage was 7.1 V, and 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, when the measurement surface softened and the height position of the cantilever decreased by 20 nm, the measurement was terminated. When the height position did not decrease by 20 nm from the change point and reached the maximum applied voltage, the maximum applied voltages at the time of Detrend correction and measurement were increased by 0.5 V and the measurement was performed again.

[0087] The applied voltage at the point where the vertical height position of the cantilever was maximum was read as the voltage value (applied voltage at the softening point) for calculating the softening temperature.

[0088] 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 amount of deflection of the cantilever) was set to 2.0 V, and the voltage application acceleration (heating rate) was set to 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.

[0089] Using the composition 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 were shown in Tables 1 to 3.

[0090] Next, on the surface of the overcoat layer 4 provided on the moisture-proof layer a1 laminated on the paper substrate 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 5) was also formed by gravure printing using an ink with nitrocellulose and an acrylic resin as binders.

[0091] Subsequently, a surface protection layer (protective resin layer 6) was formed by gravure printing using a 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.

[0092] <Production of the flash door> (Example 8) In Example 1, a back moisture-proof sheet 12 having only a moisture-proof layer a1 on a paper base material 1 was obtained without forming a printed pattern layer 5 and a surface protection layer (protective resin layer 6).

[0093] With the paper base material 1 side of the moisture-proof decorative paper 10 obtained in Example 1 as the adhesive side, on the surface of an MDF board base material S (manufactured by Hokushin Co., Ltd.: thickness: 3 mm), and with the paper base material 1 side of the back moisture-proof sheet 12 obtained in Example 8 as the adhesive side, on the back surface of the board base material 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) to obtain a moisture-proof decorative board 22 with warp prevention.

[0094] 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 moisture-proof sheet 12 side of the moisture-proof decorative board 22 facing the inside (four-sided frame side) respectively, a flush door (810 mm × 2030 mm) was produced using a vinyl acetate-based resin adhesive (manufactured by Konishi Co., Ltd.).

[0095] <Production of Flush Door> (Comparative Example 5) As a conventional moisture-proof sheet, the corona-treated surfaces of two sheets of paper-interlayer reinforced paper (manufactured by Amma 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-interlayer reinforced paper / polyethylene / paper-interlayer reinforced paper).

[0096] Next, on the front surface of the moisture-proof sheet, in the same procedure as in Example 1, an ink using nitrocellulose and acrylic resin as binders was used for gravure printing to form a solid ink layer. On top of that, an ink using nitrocellulose and acrylic resin as binders was also used for gravure printing to form a pattern ink layer (printed pattern layer 5).

[0097] Subsequently, a surface protective layer (protective resin layer 6) was formed by gravure printing using a urethane-based acrylic polyol and an isocyanate to obtain a moisture-proof decorative sheet of Comparative Example 5.

[0098] 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 via a vinyl acetate resin-based adhesive (manufactured by Konishi Co., Ltd.) (applied at 5 g / foot in the wet state) to obtain a moisture-proof decorative board with warping prevention.

[0099] 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 side), a flush door (810 mm × 2030 mm) was produced using a vinyl acetate resin-based adhesive (manufactured by Konishi Co., Ltd.).

[0100] <Production of Flush Door> (Comparative Example 6) Paper interlayer reinforced paper with a basis weight of 50 g / m 2 On one side of (manufactured by Amma Special Paper Co., Ltd.), an ink containing nitrocellulose and an acrylic resin as a binder was used to form a solid ink layer by gravure printing in the same procedure as in Example 1. On top of that, in the same manner as in Example 1, an ink containing nitrocellulose and an acrylic resin as a binder was used to form a pattern ink layer (printed pattern layer 5) by gravure printing.

[0101] Subsequently, a surface protective layer (protective resin layer 6) was formed by gravure printing using a urethane-based acrylic polyol and an isocyanate to obtain a decorative paper of Comparative Example 6.

[0102] 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 a basis weight of 50 g / m 2The inter-ply reinforced paper (manufactured by Amano Special Paper Co., Ltd.) was laminated on the back surface of the MDF via a vinyl acetate resin-based adhesive (manufactured by Konishi Co., Ltd.) (applied at 5 g / square foot in a wet state) respectively to obtain the decorative board of Comparative Example 6.

[0103] 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 inter-ply reinforced paper side of the decorative board facing inward (towards the four-sided frame) respectively, a flush door (810 mm × 2030 mm) was fabricated using a vinyl acetate resin-based adhesive (manufactured by Konishi Co., Ltd.).

[0104] [Evaluation] <Evaluation 1> Regarding each of the moisture-proof decorative papers of Examples 1 to 7 and Comparative Examples 1 to 4 prepared above, the moisture permeability (water vapor transmission rate) was calculated in accordance with JIS Z 0208, and the moisture permeability was compared respectively. The results are shown in Tables 1 to 3.

[0105]

Table 1

[0106]

Table 2

[0107]

Table 3

[0108] As is clear from the results of Tables 1 to 3, the moisture-proof decorative papers of each example had a lower moisture permeability (water vapor transmission rate) compared to the moisture-proof decorative papers of each comparative example. The moisture-proof decorative papers of this example showed an improvement in the performance of the moisture permeability (water vapor transmission rate) due to the provision of a moisture-proof layer, and it is expected to have the effect of reducing the warping of the decorative 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.

[0109] <Evaluation 2> For the flash doors produced in Example 8 and Comparative Examples 5 and 6, a warp test was conducted in a two-chamber one-piece environmental test chamber. As a test method, the flash door was installed at the boundary between the two chambers, with one side in a high-humidity environment and the other side in a low-humidity environment, and the amount of warp of the flash door was measured. As 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 chambers were left standing for 16 hours in an environment with a humidity of 50% ± 5% and a temperature of 20°C. 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.

[0110]

Table 4

[0111] From the results in Table 4, it was confirmed that for the flash door of Example 8, in all cases of the height direction, width direction, and diagonal direction, the maximum displacement amount was smaller compared to each flash door of Comparative Examples 5 and 6.

[0112] From Tables 1 to 4, it was verified that it is possible to provide moisture-proof decorative boards and fittings such as doors that can prevent warping even when using decorative boards or the like in places 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 the problem of the present invention.

[0113] Also, for example, the present invention can adopt the following configurations. (1) On one surface of a paper substrate, a moisture-proof layer and a decorative layer are provided in this order. The moisture-proof layer includes an anchor coat layer, a silica vapor deposition layer, and an overcoat layer on one surface of the paper substrate in this order. The decorative layer is a moisture-proof decorative paper that includes a printed pattern layer and a protective resin layer on the moisture-proof layer in this order. The anchor coat layer and the overcoat layer are in direct contact with the silica vapor deposition layer. In the cross-section of the moisture-proof tissue paper in the thickness direction, the softening temperature of the anchor coat layer measured by local thermal analysis is 180 °C or higher. The moisture-proof tissue paper is characterized by this. (2) A moisture-proof layer and a cosmetic layer are provided in this order on one surface of a paper substrate. The moisture-proof layer includes an anchor coat layer, a silica vapor deposition layer, and an overcoat layer in this order on one surface of the paper substrate. The cosmetic layer is a moisture-proof tissue paper that includes a printed pattern layer and a protective resin layer in this order on the moisture-proof layer. 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 tissue paper is characterized by this. (3) The overcoat layer contains a polyolefin having at least one polar group. The moisture-proof tissue paper according to (1) or (2) above is characterized by this. (4) The thickness of the silica vapor deposition layer is in the range of 10 nm or more and 100 nm or less. The moisture-proof tissue paper according to any one of (1) to (3) above is characterized by this. (5) The thickness of the overcoat layer is in the range of 2 μm or more and 10 μm or less. The moisture-proof tissue paper according to any one of (1) to (4) above is characterized by this. (6) The mass of the paper component contained in the paper substrate is 50% by mass or more based on the mass of the entire moisture-proof tissue paper. The moisture-proof tissue paper according to any one of (1) to (5) above is characterized by this. (7) The paper substrate is paper-interlayer reinforced paper. The moisture-proof tissue paper according to any one of (1) to (6) above is characterized by this. (8) The surface on the paper substrate side of the moisture-proof tissue paper according to any one of (1) to (7) above is adhered to one surface of a plate substrate, and the moisture permeability is 5 (g / m2 ·A moisture-proof back sheet with a moisture permeability of 24 g / m²·24h or less is adhered to the other surface of the board substrate, characterized in that it is a moisture-proof decorative board. (9) The moisture-proof back sheet includes a paper substrate, an anchor coat layer, a silica vapor deposition layer, and an overcoat layer in this order, characterized in that it is the moisture-proof decorative board according to (8) above. (10) The surfaces on the moisture-proof back sheet side of the moisture-proof decorative board according to (8) or (9) above are respectively adhered to the front and back surfaces of a wood-based core member, characterized in that it is a fitting.

Explanation of symbols

[0114] 1 ··· Paper substrate 2 ··· Anchor coat layer 3 ··· Silica vapor deposition layer (vapor deposition layer) 4 ··· Overcoat layer 5 ··· Printed pattern layer 6 ··· Protective resin layer (surface protective layer) 10 ··· Moisture-proof decorative paper 11 ··· Moisture-proof back sheet 12 ··· Moisture-proof back sheet 21 ··· Moisture-proof decorative board 22 ··· Moisture-proof decorative board 23 ··· Moisture-proof decorative board 30 ··· Fitting a1 ··· Moisture-proof layer a2 ··· Decorative layer S ··· Board substrate SS ··· Core material

Claims

1. A moisture-proof decorative paper provided with a moisture-proof layer and a decorative layer in this order on one surface of a paper base material, wherein the moisture-proof layer includes an anchor coat layer, a silica vapor deposition layer, and an overcoat layer in this order on one surface of the paper base material, the decorative layer is a moisture-proof decorative paper including a printed pattern layer and a protective resin layer in this order on the moisture-proof layer, 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 is 180°C or higher.

2. A moisture-proof decorative paper provided with a moisture-proof layer and a decorative layer in this order on one surface of a paper base material, wherein the moisture-proof layer includes an anchor coat layer, a silica vapor deposition layer, and an overcoat layer in this order on one surface of the paper base material, the decorative layer is a moisture-proof decorative paper including a printed pattern layer and a protective resin layer in this order on the moisture-proof layer, and the anchor coat layer contains 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 decorative paper according to claim 1 or 2, wherein the overcoat layer contains a polyolefin having at least one polar group.

4. The moisture-proof decorative 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 decorative 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 decorative paper according to claim 1 or 2, 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 decorative paper.

7. The moisture-proof decorative paper according to claim 1 or 2, wherein the paper base material is a paper reinforced paper.

8. The surface on the paper base material side of the moisture-proof cosmetic paper according to claim 1 or 2 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, and the moisture-proof cosmetic board is characterized by this.

9. The moisture-proof decorative board according to claim 8, wherein the back 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. A fixture, wherein the surface on the side of the back moisture-proof sheet of the moisture-proof decorative board according to claim 9 is adhered to the front and back surfaces of a wood-based core member, respectively.

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