Moisture-proof decorative paper, and moisture-proof decorative panels and fittings using the same

Abstract

To provide moisture-proof decorative paper, a moisture-proof decorative plate and fittings such as a door that is used in fittings such as an indoor door, a kitchen door, a storage door and a Fusuma which have a function of preventing warpage generated by humidity change and temperature change.SOLUTION: Decorative paper 20 is formed by laminating a paper base material 21, a printing pattern layer 22, and a protective resin layer 23 in this order, wherein a moisture-proof layer 30 has an anchor coat layer 31 containing first polyolefin having at least one selected from a carboxyl group, a salt of a carboxyl group, a carboxylic acid anhydride group and carboxylate, a vapor-deposited layer 33, and an overcoat layer 34 containing second polyolefin having at least one selected from a carboxyl group, a salt of a carboxyl group, a carboxylic acid anhydride group and carboxylate in this order on the rear face side of the paper base material 21, and a layer 32 containing a polyvinyl alcohol-based resin is provided between the paper base material 21 and the anchor coat layer 31 or between the anchor coat layer 31 and the vapor-deposited layer 33.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to moisture-proof decorative paper and moisture-proof decorative panels and doors that use the same, and is used for fittings such as interior doors, kitchen doors, storage doors, and sliding doors. More specifically, the paper has the function of preventing warping caused by changes in humidity, temperature, etc. [Background technology]

[0002] In the past, interior doors, kitchen doors, storage doors, and other fixtures would gradually warp during use due to humidity and temperature differences. This phenomenon occurs mainly because humidity and temperature differences between indoors and outdoors cause an imbalance in the moisture content distribution inside the wooden fixture. In other words, when humidity differences occur, differences occur in the amount of moisture absorbed and released on the front and back surfaces of the wooden fixture, causing the higher humidity side to expand due to a higher moisture content and the lower humidity side to shrink due to a lower moisture content, resulting in warping. Furthermore, when a temperature difference occurs, moisture in the wood substrate moves to the cold side, creating a gradient in moisture content along the thickness direction and causing warping. Usually, the cold side has high humidity and moisture content, and in this case, the two effects work in the same direction, which is thought to be the most pronounced cause of warping.

[0003] Methods of preventing such warping of wooden fixtures include using sheets of the same material on the front and back of doors and other fixtures to prevent them from warping to one side, and using metal supports for the frames of the fixtures. Furthermore, a method of reducing the amount of moisture absorbed and released by building materials by using moisture-proof sheets with low moisture permeability as building materials is widely used.

[0004] It has been proposed to previously adhere a moisture-proof decorative sheet having a five-layer structure of, from the front side, a protective resin layer / printed pattern layer / reinforced paper between the sheets / synthetic resin layer / reinforced paper between the sheets, to the front side of a board substrate such as plywood, using an adhesive, and also adhere a moisture-proof back sheet having a three-layer structure of reinforcing paper between the sheets / synthetic resin / reinforced paper between the sheets, using an adhesive, to the back side of the board substrate to form a moisture-proof decorative board, and then adhere this moisture-proof decorative board to the front and back of a flush door, respectively, using an adhesive (see paragraphs

[0013] to

[0016] and Figures 1 to 4 of Patent Document 1). The moisture permeability of the moisture-proof sheet at this time is 5 to 30 (g / m 2 24 hours) is considered to be good (see [Claim 2] of Patent Document 1). According to this configuration, in the moisture-proof decorative board used as the front and back decorative surface material of a flush door, the moisture-proof sheet and moisture-proof back sheet attached to the front and back of the board base material have high moisture-proof functionality, so changes in the moisture content of the board base material of the moisture-proof decorative board due to temperature and humidity differences between the front and back sides of the flush door are suppressed, resulting in an anti-warping effect. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Patent No. 3206408 Summary of the Invention [Problem to be solved by the invention]

[0006] However, in recent years, from the perspective of door design, doors over 2m in height are increasingly being adopted. As doors become taller, even a slight amount of warping can cause a large amount of warping in the entire door, so higher moisture resistance is required. As a sheet with high moisture resistance, a moisture-proof sheet with a synthetic resin base material, a metal vapor deposition film and a coating layer, has been proposed. The moisture permeability is 5 (g / m 2 It is said to be highly effective in preventing warping when used for a period of 24 hours or less. All of these moisture-proof sheets use plastic materials, so reducing the amount of plastic used is desirable from an environmental perspective. Furthermore, when recycling decorative panels, doors, and other fixtures to which these moisture-proof sheets are attached, the wood base material and the plastic portion (synthetic resin layer and synthetic resin base material) must be separated, making them unsuitable for recycling.

[0007] The present invention has been made to solve this problem, and aims to provide a moisture-proof decorative paper that prevents warping even when used in a place where there is a large difference in temperature and humidity environment on both sides, and a moisture-proof decorative board and fittings such as doors that use the same. Furthermore, the present invention aims to provide moisture-proof decorative paper that reduces the amount of plastic used and has excellent recyclability, and moisture-proof decorative boards and fittings such as doors that use the same. [Means for solving the problem]

[0008] The present invention has solved this problem, and one embodiment of the moisture-proof decorative paper of the present invention is a moisture-proof decorative paper having a moisture-proof layer laminated on the back surface of the decorative paper, wherein the decorative paper is formed by laminating a paper base material, a printed pattern layer, and a protective resin layer in this order, and the moisture-proof layer comprises, on the back surface side of the paper base material, an anchor coat layer containing a first polyolefin having at least one selected from a carboxyl group, a salt of a carboxyl group, a carboxylic acid anhydride group, and a carboxylic acid ester, a vapor deposition layer, and an overcoat layer containing a second polyolefin having at least one selected from a carboxyl group, a salt of a carboxyl group, a carboxylic acid anhydride group, and a carboxylic acid ester, in this order, and is characterized in that a layer containing a polyvinyl alcohol-based resin is provided between the paper base material and the anchor coat layer or between the anchor coat layer and the vapor deposition layer.

[0009] Furthermore, the moisture-proof decorative paper according to one aspect of the present invention is characterized in that the thickness of the anchor coat layer is 1 μm or more and 5 μm or less.

[0010] The moisture-proof decorative paper according to one aspect of the present invention is characterized in that the thickness of the layer containing the polyvinyl alcohol resin is 1 μm or more and 5 μm or less.

[0011] The moisture-proof decorative paper according to one aspect of the present invention is characterized in that the thickness of the vapor-deposited layer is 30 nm or more and 100 nm or less.

[0012] The moisture-proof decorative paper according to one aspect of the present invention is characterized in that the thickness of the overcoat layer is 2 μm or more and 10 μm or less.

[0013] The moisture-proof decorative paper according to one aspect of the present invention is characterized in that the weight of the paper is 50% by mass or more based on the entire moisture-proof layer.

[0014] The moisture-proof decorative paper according to one aspect of the present invention is characterized in that an adhesive primer layer is provided on the exposed surface of the moisture-proof layer.

[0015] A moisture-proof decorative board according to one aspect of the present invention is characterized in that the paper base material is a reinforced paper.

[0016] A moisture-proof decorative board according to one embodiment of the present invention is a board having a moisture-proof decorative paper attached to the surface of a board substrate such as plywood, and a moisture permeability of 5 g / m 2 A moisture-proof sheet having a back surface with a shelf life of 24 hours or less is attached to the back surface of the plate substrate.

[0017] A moisture-proof decorative board according to one embodiment of the present invention is characterized in that the back moisture-proof sheet comprises, on a paper substrate, an anchor coat layer containing a first polyolefin having at least one selected from a carboxyl group, a salt of a carboxyl group, a carboxylic anhydride group, and a carboxylic acid ester, in that order; a vapor deposition layer; and an overcoat layer containing a second polyolefin having at least one selected from a carboxyl group, a salt of a carboxyl group, a carboxylic anhydride group, and a carboxylic acid ester, and a moisture-proof layer containing a polyvinyl alcohol-based resin is provided between the paper substrate and the anchor coat layer or between the anchor coat layer and the vapor deposition layer.

[0018] One aspect of the present invention is a door or other fitting, characterized in that a moisture-proof decorative panel is pressed onto the front and back surfaces of a wood-based core member, with the back moisture-proof sheet facing inward. [Effects of the Invention]

[0019] According to one aspect of the moisture-proof decorative paper of the present invention, moisture permeability can be significantly reduced, and even when used in a location where there is a large difference in temperature and humidity environment on both sides, warping of fittings such as doors can be prevented. Furthermore, the moisture-proof decorative paper according to one aspect of the present invention can contribute to reducing the amount of plastic materials used and is highly recyclable. [Brief explanation of the drawings]

[0020] [Figure 1] 1 is an explanatory diagram showing a first embodiment of the present invention, illustrating the cross-sectional shape of moisture-proof decorative paper. FIG. [Figure 2] This shows a second embodiment of the present invention, which is a modified example of Figure 1, in which a layer containing a polyvinyl alcohol resin is located between the paper base material and the anchor coat layer, and is an explanatory diagram showing the cross-sectional shape of the moisture-proof decorative paper. [Figure 3] FIG. 3 shows a third embodiment of the present invention, which is another modified example of FIG. 1, and is an explanatory diagram showing the cross-sectional shape of a moisture-proof decorative paper in which an adhesive primer layer is provided on the exposed surface of the overcoat layer. [Figure 4] FIG. 10 is an explanatory diagram showing a cross-sectional shape of a moisture-proof decorative board A according to a fourth embodiment of the present invention. [Figure 5] FIG. 5 shows a fifth embodiment of the present invention, a modified example of the embodiment shown in FIG. 4, and an explanatory view showing the cross-sectional shape of one embodiment of the moisture-proof decorative board B. [Figure 6] FIG. 10 is an explanatory diagram showing a cross-sectional shape of a part of a fixture such as a door according to a sixth embodiment of the present invention. [Figure 7] FIG. 10 is an explanatory diagram showing a seventh embodiment of the present invention, illustrating a cross-sectional shape of a part of a modified example of the fitting such as the door of FIG. 6. DETAILED DESCRIPTION OF THE INVENTION

[0021] (Explanation of Figures 1 to 7) Hereinafter, embodiments of the present invention will be described with reference to FIGS. The drawings are schematic, and the relationship between thickness and planar dimensions, the thickness ratio of each layer, etc., differ from the actual ones. Furthermore, the embodiments shown below are merely examples of configurations for embodying the technical idea of ​​the present invention, and the technical idea of ​​the present invention does not specify the materials, shapes, structures, etc. of the components to be described below. The technical idea of ​​the present invention can be modified in various ways within the technical scope defined by the claims.

[0022] (Moisture-proof decorative paper 10 in Figure 1) As shown in FIG. 1, the moisture-proof decorative paper 10 according to the present invention is roughly divided into two layers, with a moisture-proof layer 30 laminated on the back surface of decorative paper 20. The decorative paper 20 is made up of three layers, a paper base material 21, a print pattern layer 22, and a protective resin layer 23, laminated in this order. The moisture-proof layer 30 consists of four layers, which are provided on the back side of the paper substrate 21 in this order: an anchor coat layer 31, a layer 32 containing a polyvinyl alcohol resin, a vapor deposition layer 33, and an overcoat layer 34. The layer 32 containing a polyvinyl alcohol-based resin is located between the anchor coat layer 31 and the vapor deposition layer 33 .

[0023] (Moisture permeability of moisture-proof decorative paper 10) The moisture permeability of the moisture-proof decorative paper 10 (JIS Z 0208, the same applies hereinafter) is 5 g / m 2 24 hours or less is preferable, and less than 4 g / m is more preferable. 2 ·24hr or less, 3g / m 2 24 hours or less is preferable. The lower limit is 0 g / m 2 24 hours is also acceptable, and 0.1g / m 2 ·24hr or more, 0.3g / m 2 ·24hr or more, 0.5g / m 2 ·24hr or more, 1.0g / m 2 -24 hours or more is also acceptable.

[0024] (Paper base material 21) The paper substrate 21 is not particularly limited and may be selected appropriately depending on the intended use of the moisture-proof decorative paper 10. Specific examples of the paper substrate 21 include tissue paper, fine paper, art paper, cast coated paper, kraft paper, titanium paper, linter paper, paperboard, gypsum board paper, fine paper, coated paper, parchment paper, glassine paper, parchment paper, paraffin paper, and Japanese paper. Preferably, thin paper in which synthetic resin is mixed to increase the strength between the sheets (so-called inter-sheet reinforced paper) or paper impregnated with latex or synthetic resin is used. The basis weight is not particularly limited, but is preferably 20 g / m 2 Below 200g / m, the fabric is too flexible and wrinkles easily occur during processing. 2 In this case, peeling from the paper layer is likely to occur, so 20 to 200 g / m 2 is preferable, and 20 to 100 g / m 2 More preferably, 20 to 50 g / m 2 is more preferred. Furthermore, the paper substrate 21 may be subjected to surface treatment such as corona treatment, plasma treatment, or flame treatment, if necessary.

[0025] The paper substrate 21 may be provided with a coating layer (not shown) at least on the side that contacts the layer 32 containing a polyvinyl alcohol-based resin, which will be described later. The coating layer can prevent the layer 32 containing a polyvinyl alcohol-based resin from penetrating into the paper, and can also serve as a sealant that fills in unevenness in the paper, allowing the layer 32 containing a polyvinyl alcohol-based resin to be formed uniformly without defects. The coating layer may contain, for example, various copolymers such as styrene-butadiene, styrene-acrylic, and ethylene-vinyl acetate copolymers, polyvinyl alcohol resins, cellulose resins, paraffin (wax), etc. as binder resins, and may also contain clay, kaolin, calcium carbonate, talc, mica, etc. as fillers. The thickness of the coating layer is not particularly limited, but may be, for example, 1 to 10 μm, or 3 to 8 μm.

[0026] The weight of the paper substrate 21 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 weight of the moisture-proof layer 30. If the weight of the paper substrate 21 is 50% by mass or more based on the weight of the moisture-proof layer 30, the amount of plastic material used can be sufficiently reduced, and the moisture-proof decorative paper 10 can be said to be made of paper.

[0027] (Printed pattern layer 22) The printed pattern layer 22 is intended to impart design, and any pattern can be used as the pattern, such as a wood grain pattern, a stone pattern, a fabric pattern, a cork pattern, an abstract pattern, or a combination of two or more of these. A solid ink layer can be provided between the printed pattern layer 22 and the paper substrate 21 to ensure hiding power. The printing method is not particularly limited, and known printing methods such as gravure printing, offset printing, silk screen printing, and inkjet printing can be used. There are no particular limitations on the printing ink, etc., and either oil-based or water-based inks are acceptable. The same printing inks as those used for the print pattern layer of conventional decorative paper can be used, such as acrylic ink. For example, a two-component curing urethane resin ink made by blending an isocyanate curing agent with an acrylic polyol vehicle can be used as the acrylic ink.

[0028] (protective resin layer 23) The protective resin layer 23 is a layer for protecting the surface of the moisture-proof decorative paper 10. The protective resin layer 23 is provided to impart surface 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 board A100, the moisture-proof decorative board B101, and fittings such as doors. There are no particular limitations on the formation of the protective resin layer 23, and it can be formed by a known coating method such as gravure coating. There are no particular restrictions on the material of the protective resin layer 23, and the same materials as those used for the protective resin layer 23 in conventional decorative paper can be used. For example, acrylic urethane resins and ionizing radiation curable resins can be used. The acrylic urethane resin may be, for example, a reaction product of an acrylic polyol compound as a base compound and an isocyanate compound as a curing agent. The ionizing radiation curable resin may be, for example, a composition whose main component is at least one of a prepolymer, oligomer, and monomer having a polymerizable unsaturated bond such as a (meth)acryloyl group, which undergoes a crosslinking reaction upon irradiation with ionizing radiation such as electron beams or ultraviolet rays.

[0029] The protective resin layer 23 may be a single layer or may be a multi-layer consisting of two or three layers. In the case of a multi-layer structure, a glossy matte appearance can be achieved by separately applying a matte resin and a glossy resin. It is also possible to achieve a textured appearance by partially raising the resin. Furthermore, an antibacterial agent, an antiviral agent, etc. can be added.

[0030] (Anchor coat layer 31) The anchor coat layer 31 contains a first polyolefin having at least one selected from a carboxyl group, a salt of a carboxyl group, a carboxylic anhydride group, and a carboxylic acid ester.

[0031] (Layer 32 containing polyvinyl alcohol-based resin) The layer 32 containing polyvinyl alcohol resin is located on the back side of the paper substrate 21 and is provided to improve adhesion between the paper substrate 21 and the vapor-deposited layer 33 . Examples of polyvinyl alcohol resins include fully saponified polyvinyl alcohol resins, partially saponified polyvinyl alcohol resins, modified polyvinyl alcohol resins, and ethylene-vinyl alcohol copolymer resins. The degree of polymerization of the polyvinyl alcohol resin is preferably 300 or more and 1500 or less. If the degree of polymerization is 300 or more, the moisture-proof layer 30 will have good barrier properties and flex resistance, and if the degree of polymerization is 1500 or less, the viscosity of the coating liquid of the polyvinyl alcohol resin will be low, resulting in good coatability.

[0032] The layer 32 containing the polyvinyl alcohol resin can be provided by applying a coating liquid containing the polyvinyl alcohol resin and a solvent onto the paper substrate 21 and drying it. Examples of solvents contained in the coating liquid include water, methyl alcohol, ethyl alcohol, isopropyl alcohol, n-propyl alcohol, n-butyl alcohol, n-pentyl alcohol, dimethyl sulfoxide, dimethylformamide, dimethylacetamide, etc., and particularly preferred are mixed solvents of water and alcohols such as methyl alcohol, ethyl alcohol, isopropyl alcohol, etc. The coating liquid may also contain additives such as surfactants, preservatives, storage stabilizers, silane coupling agents, and organic titanates.

[0033] Such a layer 32 containing a polyvinyl alcohol-based resin has excellent flexibility, can suppress cracking of the vapor-deposited layer 33, and can improve adhesion between the vapor-deposited layer 33 and the layer 32 containing a polyvinyl alcohol-based resin.

[0034] The thickness of the layer 32 containing a polyvinyl alcohol resin may be, for example, 1 μm or more, 2 μm or more, or 5 μm or less. If the thickness is 1 μm or more, the irregularities of the paper substrate 21 can be efficiently filled, and the vapor-deposited layer 33 can be laminated uniformly. Furthermore, if the thickness is 5 μm or less, the vapor-deposited layer 33 can be laminated uniformly while keeping costs down.

[0035] (Vapor deposited layer 33) The vapor-deposited layer 33 is a layer formed by vapor-depositing a metal or an inorganic compound. The vapor-deposited layer 33 is located on the back surface side of the layer 32 containing a polyvinyl alcohol-based resin. The vapor deposition layer 33 may be obtained by vapor deposition of aluminum, or may contain aluminum oxide (AlOx), silicon oxide (SiOx), or the like.

[0036] The thickness of the vapor-deposited layer 33 may be appropriately set depending on the intended use, but is preferably 30 nm or more, 50 nm or more, and may be 100 nm or less, 80 nm or less. Setting the thickness of the vapor-deposited layer 33 to 30 nm or more makes it easier to ensure sufficient continuity of the vapor-deposited layer 33, while setting the thickness to 100 nm or less makes it easier to sufficiently suppress the occurrence of curling and cracking, and to easily achieve sufficient gas barrier performance and flexibility.

[0037] From the viewpoint of barrier performance and film uniformity, it is preferable to form the vapor deposition layer 33 by a vacuum deposition method. While known deposition methods include vacuum evaporation, sputtering, and chemical vapor deposition (CVD), vacuum deposition is preferred due to its fast deposition rate and high productivity. Among vacuum deposition methods, electron beam heating is particularly effective because it allows for easy control of the deposition rate via the irradiation area and electron beam current, and allows for rapid heating and cooling of the deposition material.

[0038] (Overcoat layer 34) The overcoat layer 34 contains a second polyolefin having at least one selected from a carboxyl group, a salt of a carboxyl group, a carboxylic anhydride group, and a carboxylic acid ester. The overcoat layer 34 is located on the back surface side of the vapor deposition layer 33 and is provided so as to be in contact with the vapor deposition layer 33 .

[0039] The overcoat layer 34 has excellent flexibility, can suppress cracking of the vapor-deposited layer 33, and has excellent adhesion to the vapor-deposited layer 33. Furthermore, by including polyolefin, it is possible to obtain a moisture-proof layer 30 with excellent water vapor barrier properties.

[0040] The overcoat layer 34 may contain other components in addition to the polyolefin. Examples of other components include silane coupling agents, organic titanates, polyacrylics, polyesters, polyurethanes, polycarbonates, polyureas, polyamides, polyolefin emulsions, polyimides, melamine, and phenols.

[0041] The content of polyolefin in the overcoat layer 34 may be, for example, 50% by mass or more, 70% by mass or more, 90% by mass or more, or 100% by mass.

[0042] The thickness of the overcoat layer 34 may be, for example, 2 μm or more, 3 μm or more, 10 μm or less, 8 μm or less, or 5 μm or less. Furthermore, if the thickness of the overcoat layer 34 is 10 μm or less, the adhesion to the vapor deposition layer 33 and the barrier properties can be sufficiently exhibited while keeping costs down.

[0043] The overcoat layer 34 can be provided by applying a coating liquid containing polyolefin and a solvent onto the vapor deposition layer 33 and drying it. Examples of solvents contained in the coating liquid 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 three or more. Among these, methyl alcohol, ethyl alcohol, isopropyl alcohol, toluene, ethyl acetate, methyl ethyl ketone, and water are preferred from the viewpoint of properties, and methyl alcohol, ethyl alcohol, isopropyl alcohol, and water are preferred from the viewpoint of the environment.

[0044] (Modification of the moisture-proof decorative paper 10 in FIG. 2) The moisture-proof decorative paper 10 in Fig. 2 is a modified example. Similar to Fig. 1, the moisture-proof decorative paper 10 is roughly divided into two layers, with a moisture-proof layer 30 laminated on the back surface of the decorative paper 20. The moisture-proof layer 30 is made up of four layers, which are provided on the back side of the paper substrate 21 in this order: a layer 32 containing a polyvinyl alcohol-based resin, an anchor coat layer 31, a vapor deposition layer 33, and an overcoat layer 34. The layer 32 containing a polyvinyl alcohol resin is located between the paper substrate 21 and the anchor coat layer 31 .

[0045] (Modification of the moisture-proof decorative paper 10 in FIG. 3) The moisture-proof decorative paper 10 of FIG. 3 is another modification of the moisture-proof decorative paper 10 of FIG. 1, and as shown in FIG. 3, an adhesive primer layer 40 is provided on the exposed surface of the overcoat layer 34 of FIG. As in FIG. 1, the moisture-proof decorative paper 10 is roughly divided into two layers, with a moisture-proof layer 30 laminated on the back surface of the decorative paper 20. The moisture-proof layer 30 consists of five layers, which are provided on the back side of the paper substrate 21 in this order: an anchor coat layer 31, a layer 32 containing a polyvinyl alcohol resin, a vapor deposition layer 33, an overcoat layer 34, and an adhesive primer layer 40.

[0046] (Adhesive primer layer 40) The adhesive primer layer 40 is provided for the purpose of ensuring sufficient adhesion with various laminating adhesives, such as isocyanate-curing urethane resins and modified vinyl acetate resin emulsions, which are used when laminating onto the surface of various substrates. Known materials for this primer include various types of primers such as ester resins, urethane resins, acrylic resins, polycarbonate resins, vinyl chloride-vinyl acetate copolymers, polyvinyl butyral resins, and nitrocellulose resins, and one of these is selected to match the type of laminating adhesive. For example, when a modified vinyl acetate resin emulsion adhesive is used as the laminating adhesive, good adhesion can be obtained with a urethane adhesive primer. Furthermore, if an inorganic fine powder such as silica is added to the adhesive primer agent, the surface of the adhesive primer layer 40 is roughened, which not only prevents blocking when the moisture-proof sheet is rolled up and stored, but also improves adhesion to the laminating adhesive due to its anchoring effect. Furthermore, these adhesive primer layers 40 can be formed alone or in combination to form an adhesive composition using an appropriate application method such as roll coating or gravure printing.

[0047] (Moisture-proof decorative board A100 in Figure 4) As shown in FIG. 4, the moisture-proof decorative board A100 is made up of moisture-proof decorative paper 10, board substrate 110, and back moisture-proof sheet A11, and is roughly divided into three layers. The moisture-proof decorative paper 10 used is that shown in FIG. 1, and the back moisture-proof sheet A11 has the same moisture permeability as the moisture-proof decorative paper 10 shown in FIG. 1, for example, 5 g / m 2 Moisture permeability of 24 hours or less is preferred. The backside moisture-proof sheet A11 can be, for example, a moisture-proof sheet having a metal-deposited film and a coating layer on a synthetic resin substrate. However, from the environmental perspective of reducing the amount of plastic used, a moisture-proof sheet having a moisture-proof layer on a paper substrate is preferred. The moisture-proof decorative paper 10 and the back moisture-proof sheet A11 are attached with adhesive to the front and back surfaces of the board substrate 110. In this way, a moisture-proof decorative board A100 that has been treated to prevent warping is obtained. At this time, the moisture-proof decorative paper 10 has the overcoat layer 34 of FIG. 1 disposed on the surface adjacent to the board substrate 110.

[0048] (Plate base material 110) The board substrate 110 may be a wood-based board substrate such as medium density fiberboard (MDF), plywood, or particle board.

[0049] (Moisture-proof decorative board B101 shown in Figure 5) The moisture-proof decorative board B101 is a modified version of the moisture-proof decorative board A100 shown in Figure 4, and as shown in Figure 5, it consists of moisture-proof decorative paper 10 / board substrate 110 / backside moisture-proof sheet B12, and is roughly divided into three layers. The moisture-proof decorative paper 10 and board substrate 110 are the same as those of the moisture-proof decorative board A100 in FIG.

[0050] (Back moisture-proof sheet B12) The back moisture-proof sheet B12 is made up of five layers, with the overcoat layer 34, the vapor-deposited layer 33, the layer 32 containing polyvinyl alcohol resin, the anchor coat layer 31, and the paper substrate 21 laminated in this order. The back moisture-proof sheet B12 has a moisture-proof layer 30 of the same configuration as the moisture-proof layer 30 of the moisture-proof decorative paper 10 on an unprinted paper base material 21, and an adhesive primer layer 40 (not shown) can be provided on the exposed surface. The back moisture-proof sheet B12, like the back moisture-proof sheet A11, has the same moisture permeability as the moisture-proof decorative paper 10 in FIG. 1, for example, 5 g / m 2 Moisture permeability of 24 hours or less is preferred. The back surface moisture-proof sheet B12 is then attached with an adhesive to the back surface of the board substrate 110. In this way, a moisture-proof decorative board B101 that has been prevented from warping is obtained. At this time, the back surface moisture-proof sheet B12 has the overcoat layer 34 of FIG. 4 disposed on the surface adjacent to the plate substrate 110.

[0051] (Part of the doors and other fixtures in Figures 6 and 7) As shown in FIG. 6, some fittings such as doors are made up of a moisture-proof decorative board A100 / core assembly member 120 / moisture-proof decorative board A100, which can be broadly divided into three layers. Furthermore, some of the other fittings, such as doors, are made up of a moisture-proof decorative board B101 / core member 120 / moisture-proof decorative board B101, as shown in FIG. 7, and are roughly divided into three layers. As shown in Figs. 6 and 7, some of the fittings are flush doors or the like that are made by using moisture-proof decorative boards A100 or B101 on both sides of doors and are flush-processed. The moisture-proof decorative board A100 or B101 is pressure-bonded to the front and back surfaces of a wooden core member 120 using an adhesive, and is used as a fixture such as a flush door that is warp-resistant. At this time, the moisture-proof decorative board A100 in FIG. 6 is pressed with the back moisture-proof sheet A11 facing inward using an adhesive, and the moisture-proof decorative board B101 in FIG. 7 is pressed with the back moisture-proof sheet B12 facing inward using an adhesive. The core member 120 can be made of wood-based board material such as medium density fiberboard (MDF), plywood, particle board, etc., and the flush door can also be made of core material such as honeycomb panel. The adhesive used in the present invention is not limited to, for example, aqueous adhesives, solvent adhesives, chemical reaction adhesives, hot melt adhesives, etc. Any type of adhesive may be used. Known or commercially available adhesives may be appropriately selected and used.

[0052] (Features and Effects of the Embodiments Based on the Present Invention) The features of the embodiment of the present invention are as follows. (First feature) A first characteristic feature of the moisture-proof decorative paper 10 is, as shown in Figures 1 and 2, moisture-proof decorative paper 10 formed by laminating a moisture-proof layer 30 on the back surface of decorative paper 20. The decorative paper 20 is formed by laminating a paper base material 21, a printed pattern layer 22, and a protective resin layer 23 in this order. The moisture-proof layer 30 is formed on the back surface of the paper base material 21 by laminating an anchor coat layer 31 containing a first polyolefin having at least one selected from a carboxyl group, a carboxyl group salt, a carboxylic acid anhydride group, and a carboxylic acid ester, a vapor deposition layer 33, and an overcoat layer 34 containing a second polyolefin having at least one selected from a carboxyl group, a carboxyl group salt, a carboxylic acid anhydride group, and a carboxylic acid ester, in this order. A layer 32 containing a polyvinyl alcohol-based resin is provided between the paper base material 21 and the anchor coat layer 31 (e.g., Figure 2) or between the anchor coat layer 31 and the vapor deposition layer 33 (e.g., Figure 1).

[0053] (Effect of the first feature) According to the first characteristic, moisture permeability can be significantly reduced, and warping of fittings such as doors can be prevented even when used in a location where there is a large difference in temperature and humidity environment on both sides. Furthermore, according to the first characteristic point, it can contribute to reducing the amount of plastic material used, and since it is made of wood material and paper components, it is also highly recyclable. Specifically, as shown in Tables 1 and 2 below, in the examples and comparative examples, the moisture permeability (JIS Z 0208) is 5.0 g / m 2 -Because it lasts for 24 hours or less, it has significantly better moisture-proofing performance than moisture-proof sheets made of synthetic resins such as vinyl chloride, polyethylene, polypropylene, etc., or paper / polyethylene / paper.

[0054] (Second feature) The second feature is that the moisture-proof decorative paper 10 has an anchor coat layer 31 with a thickness of 1 μm or more and 5 μm or less.

[0055] (Effect of the second feature) According to the second feature, when the thickness of the anchor coat layer 31 is 1 μm or more, the irregularities of the paper base material 21 can be filled up efficiently. Furthermore, if the thickness of the anchor coat layer 31 is 5 μm or less, costs can be kept down.

[0056] (Third feature) A third feature of the moisture-proof decorative paper 10 is that the thickness of the layer 32 containing the polyvinyl alcohol resin is 1 μm or more and 5 μm or less. (Effect of the third feature) According to the third feature, when the thickness of the layer 32 containing the polyvinyl alcohol-based resin is 1 μm or more, the vapor-deposited layer 33 can be laminated uniformly. Furthermore, if the thickness of the layer 32 containing the polyvinyl alcohol-based resin is 5 μm or less, the vapor-deposited layer 33 can be laminated uniformly while keeping costs down.

[0057] (Fourth feature) A fourth feature of the moisture-proof decorative paper 10 is that the thickness of the vapor-deposited layer 33 is 30 nm or more and 100 nm or less. (Effect of the fourth feature) According to the fourth feature, by making the thickness of the vapor deposition layer 33 30 nm or more, it is easy to ensure sufficient continuity of the vapor deposition layer 33, and by making the thickness 100 nm or less, it is possible to sufficiently suppress the occurrence of curling and cracking, and it is easy to achieve sufficient gas barrier performance and flexibility.

[0058] (5th feature) A fifth feature of the moisture-proof decorative paper 10 is that the thickness of the overcoat layer 34 is 2 μm or more and 10 μm or less. (Effect of the fifth feature) According to the fifth feature, the thickness of the overcoat layer 34 is 2 μm or more and 10 μm or less, so that the adhesion to the deposition layer 33 and the barrier properties can be sufficiently exhibited while keeping costs down.

[0059] (6th feature) A sixth characteristic feature is that the moisture-proof decorative paper 10 has a paper weight of 50% by mass or more based on the entire moisture-proof layer 30. (Effect of the 6th feature) According to the sixth feature, if the content is 50 mass % or more, the amount of plastic material used can be sufficiently reduced. That is, according to the sixth characteristic point, it contributes to reducing the amount of plastic material used, and since it is made of wood material and paper components, it is also highly recyclable.

[0060] (7th feature) The seventh feature is that the moisture-proof decorative paper 10 has an adhesive primer layer 40 provided on the exposed surface of the moisture-proof layer 30. (Effect of the seventh feature) According to the seventh feature, the adhesive primer layer 40 can be used for laminating and adhering to the surface of various substrates. For example, sufficient adhesion is ensured with various laminating adhesives such as isocyanate-curing urethane resins and modified vinyl acetate resin emulsions. Furthermore, by adding, for example, inorganic fine powder to the adhesive primer layer 40, the surface of the adhesive primer layer 40 is roughened, which not only prevents blocking when the moisture-proof decorative paper 10 is rolled up and stored, but also improves adhesion with the laminating adhesive due to the anchoring effect. Furthermore, by adding inorganic fine powder to the adhesive primer, the surface of the adhesive primer layer 40 is roughened, which not only prevents blocking when the moisture-proof decorative paper 10 is rolled up and stored, but also improves adhesion with the laminating adhesive due to its anchoring effect.

[0061] (8th feature) An eighth characteristic feature is that the moisture-proof decorative paper 10 has a paper substrate 21 that is a reinforced inter-paper paper. (Effect of the 8th feature) According to the eighth characteristic point, by using inter-layer reinforced paper, it is possible to prevent the paper layers from peeling from between the layers when the product is used for a long period of time or when an unavoidable external force is applied.

[0062] (9th feature) The ninth feature is a moisture-proof decorative board (moisture-proof decorative board A100, moisture-proof decorative board B101), which is formed by adhering moisture-proof decorative paper 10 to the surface of a board substrate 110 such as plywood, for example, as shown in FIGS. 4 and 5, and having a moisture permeability of 5 g / m 2 A back surface moisture-proof sheet (back surface moisture-proof sheet A11, back surface moisture-proof sheet B12) having a life of 24 hours or less was attached to the back surface of the plate substrate 110. (Effect of the 9th feature point) According to the ninth feature, moisture permeability can be significantly reduced, and warping of the moisture-proof decorative board (for example, moisture-proof decorative board A100, moisture-proof decorative board B101) can be prevented even when used in a location where there is a large difference in temperature and humidity environment on both sides.

[0063] (10th feature) The tenth feature is a moisture-proof decorative board (moisture-proof decorative board A100, moisture-proof decorative board B101), which, as shown in Figures 1 and 2, for example, has a back moisture-proof sheet (back moisture-proof sheet A11, back moisture-proof sheet B12) on a paper substrate 21, which has, in this order, an anchor coat layer 31 containing a first polyolefin having at least one selected from a carboxyl group, a salt of a carboxyl group, a carboxylic anhydride group, and a carboxylic acid ester, a vapor deposition layer 33, and an overcoat layer 34 containing a second polyolefin having at least one selected from a carboxyl group, a salt of a carboxyl group, a carboxylic anhydride group, and a carboxylic acid ester, and a moisture-proof layer 30 containing a polyvinyl alcohol-based resin between the paper substrate 21 and the anchor coat layer 31 (for example, Figure 2) or between the anchor coat layer 31 and the vapor deposition layer 33 (for example, Figure 1). (Effect of the 10th feature point) According to the tenth feature, moisture permeability can be significantly reduced, and even when used in a location where there is a large difference in temperature and humidity environment on both sides, warping of the moisture-proof decorative board (e.g., moisture-proof decorative board A100, moisture-proof decorative board B101) can be prevented, as shown in Figures 4 and 5.

[0064] (11th feature) The eleventh feature is a moisture-proof decorative board (moisture-proof decorative board A100, moisture-proof decorative board B101), which is pressed onto the front and back surfaces of a wood-based core member 120, with the back moisture-proof sheet (back moisture-proof sheet A11, back moisture-proof sheet B12) facing inward, as shown in Figures 6 and 7, for example. (Effect of the 11th feature point) According to the eleventh characteristic point, moisture permeability can be significantly reduced, and warping of doors and other fixtures can be prevented even when used in a location where there is a large difference in temperature and humidity environment on both sides. [Example]

[0065] The present invention will be explained in more detail below with reference to examples, but the present invention is not limited to the following examples in any way. Example 1 In Example 1, the paper substrate was 50 g / m 2A coating solution containing a carboxyl group salt (product name: Chemipearl S500, manufactured by Mitsui Chemicals) was applied to the surface of the reinforced paper (manufactured by Tenma Tokushu Paper Co., Ltd.) using a bar coater and dried in an oven to form an anchor coat layer with a thickness of 3 μm. Next, a coating solution containing polyvinyl alcohol resin, prepared by dissolving polyvinyl alcohol resin with a saponification degree of 98% and a polymerization degree of 500 in a water / 1PA=8 / 2 solution at a solids concentration of 10 mass %, was applied onto the anchor coat layer using a bar coater and dried in an oven to form a layer containing polyvinyl alcohol resin. The layer had a thickness of 1 μm. Subsequently, aluminum was vapor-deposited on the polyvinyl alcohol resin layer, resulting in an aluminum vapor-deposited layer with a thickness of 50 nm. Thereafter, a coating liquid containing a salt of a carboxyl group (product name: Chemipearl S500, manufactured by Mitsui Chemicals) was applied onto the vapor deposition layer using a bar coater and dried in an oven to form an overcoat layer, thereby obtaining a moisture-proof layer. The thickness of the polyolefin-containing layer was 3 μm. Next, a solid ink layer was applied by gravure printing to the surface of the paper substrate opposite the moisture-proof layer using an ink containing soluble nitrocellulose and acrylic resin as a binder, and then a pattern ink layer was applied on top of that by gravure printing using an ink also containing soluble nitrocellulose and acrylic resin as a binder. Subsequently, a surface protective layer was applied by gravure printing using a urethane-based acrylic polyol and isocyanate, and the moisture-proof decorative paper of Example 1 was obtained.

[0066] Example 2 In Example 2, the moisture-proof decorative paper of Example 2 was obtained in the same manner as in Example 1, except that the thickness of the anchor coat layer was 1 μm and the thickness of the layer containing polyvinyl alcohol resin was 5 μm.

[0067] Example 3 In Example 3, moisture-proof decorative paper of Example 3 was obtained in the same manner as in Example 1, except that the thickness of the anchor coat layer was set to 5 μm.

[0068] Example 4 In Example 4, the moisture-proof decorative paper of Example 4 was obtained in the same manner as in Example 1, except that the thickness of the overcoat layer was 10 μm.

[0069] Example 5 In Example 5, the moisture-proof decorative paper of Example 5 was obtained in the same manner as in Example 1, except that the vapor-deposited layer was made of silica and had a thickness of 30 nm.

[0070] Example 6 In Example 6, the moisture-proof decorative paper of Example 6 was obtained in the same manner as in Example 1, except that the vapor-deposited layer was made of alumina and had a thickness of 30 nm.

[0071] Example 7 In Example 7, the paper substrate was 50 g / m 2 A coating solution containing a carboxyl group salt (product name: Chemipearl S500, manufactured by Mitsui Chemicals) was applied to the surface of the reinforced paper (manufactured by Tenma Special Paper Co., Ltd.) using a bar coater, and then dried in an oven to form an anchor coat layer. The layer thickness was 3 μm. Next, a coating liquid containing polyvinyl alcohol resin, prepared by dissolving polyvinyl alcohol resin with a saponification degree of 98% and a polymerization degree of 500 in a water / 1PA=8 / 2 solution at a solids concentration of 10 mass %, was applied onto the anchor coat layer using a bar coater and dried in an oven to form a layer containing polyvinyl alcohol resin. The layer thickness was 1 μm. Subsequently, aluminum was vapor-deposited onto the layer containing polyvinyl alcohol resin. The thickness of the Al vapor-deposited layer was 50 nm. Then, a coating liquid containing a salt of a carboxyl group (product name: Chemipearl S500, manufactured by Mitsui Chemicals) was applied onto the vapor deposition layer using a bar coater, and dried in an oven to form an overcoat layer, thereby obtaining the back moisture-proof sheet of Example 7, which served as a moisture-proof layer. The thickness of the polyolefin-containing layer was 3 μm. The moisture permeability of the back moisture-proof sheet at this time is 2.6 g / m 2 It was 24 hours.

[0072] Furthermore, the moisture-proof layer side of the moisture-proof decorative paper obtained in Example 1 was used as the adhesive side to be laminated to the surface of an MDF board substrate (3 mm, manufactured by Hokushin Co., Ltd.), and the moisture-proof layer side of the back moisture-proof sheet was used as the adhesive side to be laminated to the back of the board substrate using a vinyl acetate resin adhesive (manufactured by Konishi Co., Ltd.) (5 g / cm, wet), to obtain a moisture-proof decorative board with anti-warping properties. Next, a flush door (810mm x 2030mm) of Example 7 was created by attaching moisture-proof decorative panels with the moisture-proof paper side facing inward to the front and back of a four-sided frame made of LVL (27mm x 26mm, manufactured by First Wood Co., Ltd.) using a vinyl acetate resin adhesive (manufactured by Konishi Materials Co., Ltd.).

[0073] Example 8 In Example 8, a flush door of Example 8 was obtained by the same procedure as in Example 7, except that the moisture-proof decorative paper obtained in Example 5 was used.

[0074] Example 9 In Example 9, a flush door of Example 9 was obtained by the same procedure as in Example 7, except that the moisture-proof decorative paper obtained in Example 6 was used.

[0075] (Comparative Example 1) In Comparative Example 1, moisture-proof decorative paper of Comparative Example 1 was obtained in the same manner as in Example 1, except that no vapor deposition layer was provided.

[0076] (Comparative Example 2) In Comparative Example 2, the paper substrate was 50 g / m 2 A coating solution containing vinyl acetate polyolefin resin was applied to the surface of the reinforced paper (manufactured by Tenma Tokushu Paper Co., Ltd.) using a bar coater and dried in an oven to form a layer containing vinyl acetate polyolefin resin. The layer had a thickness of 8 μm. Subsequently, aluminum was vapor-deposited onto the layer containing the vinyl acetate polyolefin resin. The thickness of the Al vapor-deposited layer was 50 nm. Thereafter, a coating liquid containing a salt of a carboxyl group (product name: Chemipearl S500, manufactured by Mitsui Chemicals) was applied onto the vapor deposition layer using a bar coater and dried in an oven to form a layer containing polyolefin, thereby obtaining a moisture-proof layer. The thickness of the polyolefin-containing layer was 3 μm.

[0077] Next, on the surface of the paper substrate opposite to the moisture-proof layer, a solid ink layer was applied by gravure printing using an ink containing soluble nitrocellulose and acrylic resin as a binder, as in Example 1. On top of that, a patterned ink layer was applied by gravure printing using ink that also contained nitrocellulose and acrylic resin as a binder. Subsequently, a surface protective layer was applied by gravure printing using a urethane-based acrylic polyol and isocyanate, and a moisture-proof decorative paper of Comparative Example 2 was obtained.

[0078] (Comparative Example 3) Comparative Example 3 is a conventional moisture-proof sheet of 30 g / m2 that has been corona-treated on one side. 2 The corona-treated surfaces of the above-mentioned reinforced inter-paper sheets (manufactured by Tenma Tokushu Paper Co., Ltd.) were sandwich-laminated with 50 μm of molten polyethylene resin extruded from a T-die extruder to produce a moisture-proof sheet (reinforced inter-paper sheets / polyethylene / reinforced inter-paper sheets). Next, as in Example 1, a solid ink layer was applied to the exposed surface of the moisture-proof sheet by gravure printing using an ink containing soluble nitrocellulose and acrylic resin as a binder. On top of that, a patterned ink layer was applied by gravure printing using ink that also contained nitrocellulose and acrylic resin as a binder. Subsequently, a surface protective layer was applied by gravure printing using a urethane-based acrylic polyol and isocyanate, thereby obtaining a moisture-proof decorative sheet of Comparative Example 3.

[0079] Comparative Example 4 In Comparative Example 4, a moisture-proof back sheet was obtained in the same manner as in Example 7, except that no vapor deposition layer was provided. The moisture permeability of the back moisture-proof sheet at this time is 130 g / m 2 It was 24 hours.

[0080] On the other hand, the moisture-proof decorative paper obtained in Comparative Example 1 was laminated (5 g / cm, wet) to the front of an MDF board substrate (3 mm, manufactured by Hokushin Co., Ltd.) with the moisture-proof layer side facing outward, and to the back of the board substrate with the moisture-proof layer side facing outward, using a vinyl acetate resin adhesive (manufactured by Konishi Co., Ltd.), to obtain a moisture-proof decorative board with anti-warping properties. Next, a flush door (810mm x 2030mm) of Comparative Example 4 was created by attaching the moisture-proof decorative board with the moisture-proof paper side facing inward to the front and back of a four-sided frame made of LVL (27mm x 26mm, manufactured by First Wood Co., Ltd.) and using a vinyl acetate resin adhesive (manufactured by Konishi Co., Ltd.).

[0081] (Comparative Example 5) In Comparative Example 5, the paper substrate was 50 g / m 2 A coating liquid containing a vinyl acetate polyolefin resin was applied to the surface of the reinforced paper (manufactured by Tenma Tokushu Paper Co., Ltd.) using a bar coater, and then dried in an oven to form a layer containing a vinyl acetate polyolefin resin. The layer thickness was 3 μm. Subsequently, aluminum was vapor-deposited onto the layer containing the vinyl acetate polyolefin resin. The thickness of the Al vapor-deposited layer was 50 nm. Then, a coating liquid containing a salt of a carboxyl group (product name: Chemipearl S500, manufactured by Mitsui Chemicals) was applied onto the vapor deposition layer using a bar coater, and the layer was dried in an oven to form a layer containing polyolefin, thereby obtaining a back moisture-proof sheet with a moisture-proof layer. The thickness of the polyolefin-containing layer was 3 μm. At this time, the moisture permeability of the back moisture-proof sheet is 7.1g / m 2 It was 24 hours.

[0082] The moisture-proof decorative paper obtained in Comparative Example 2 was laminated on the surface of an MDF board substrate (manufactured by Hokushin Co., Ltd.: 3 mm) with the moisture-proof layer side as the adhesive side, and on the back surface of the board substrate with the moisture-proof layer side of the back moisture-proof sheet as the adhesive side using a vinyl acetate resin adhesive (manufactured by Konishi Co., Ltd.) (5 g / shaku, wet). A wet decorative board was obtained. Next, a flush door (810mm x 2030mm) of Comparative Example 5 was created by attaching moisture-proof decorative panels with the moisture-proof paper side facing inward to the front and back of a four-sided frame made of LVL (27mm x 26mm, manufactured by First Wood Co., Ltd.) using a vinyl acetate resin adhesive (manufactured by Konishi Co., Ltd.).

[0083] (Comparative Example 6) In Comparative Example 6, the moisture-proof decorative sheet obtained in Comparative Example 3 was laminated to the front surface of an MDF board substrate (3 mm, manufactured by Hokushin Co., Ltd.), and a moisture-proof back sheet (reinforced paper between the sheets / polyethylene / reinforced paper between the sheets) was laminated to the back surface of the board substrate using a vinyl acetate resin-based adhesive (manufactured by Konishi Co., Ltd.), resulting in a moisture-proof decorative board with anti-warping properties. The moisture permeability of the back moisture-proof sheet at this time was 8.3 g / m 2 It was 24 hours. Next, a flush door (810mm x 2030mm) of Comparative Example 6 was created by attaching the moisture-proof sheet side of the moisture-proof decorative panel to the front and back of a four-sided frame cored with LVL (27mm x 26mm, manufactured by First Wood Co., Ltd.) with the moisture-proof sheet side facing inward, using a vinyl acetate resin adhesive (manufactured by Konishi Co., Ltd.).

[0084] <Rating 1> The moisture permeability of the moisture-proof decorative papers of Examples 1 to 6 and the moisture-proof decorative papers and moisture-proof sheets of Comparative Examples 1 to 3 prepared above was calculated in accordance with JIS Z 0208, and a comparison of the moisture permeability was made. The results are shown in Tables 1 and 2. [Table 1]

[0085] [Table 2]

[0086] As is clear from the results in Tables 1 and 2, the moisture-proof decorative papers of Examples 1 to 6 had significantly lower moisture permeability than the moisture-proof decorative papers and moisture-proof sheets of Comparative Examples 1 to 3. The moisture permeability of moisture-proof decorative paper is 5g / m2 As shown in Table 1, all of Examples 1 to 6 passed the test, with a test time of 24 hours or less being considered acceptable. In contrast, as shown in Table 2, all of Comparative Examples 1 to 3 failed. It can be assumed that this is because Comparative Example 1 does not have a "vapor deposition layer" compared to Example 1. It is presumed that the reason for this is that in Comparative Example 2, compared to Example 1, a "vinyl acetate polyolefin resin" was used instead of a "layer containing a polyvinyl alcohol resin." This is presumably because, compared to Example 1, Comparative Example 3 does not have the "vapor deposition layer," the "layer containing polyvinyl alcohol-based resin," and the "overcoat layer."

[0087] <Rating 2> The flush doors produced in Examples 7 to 9 and Comparative Examples 4 to 6 were subjected to warping tests in a two-chamber, one-unit environmental test chamber. The test involved placing a flush door at the boundary between two chambers, placing one side in a high-humidity environment and the other in a low-humidity environment, and measuring the amount of warping of the door. The test was carried out in detail with the high-humidity side held at a humidity of 90% ± 5% and a temperature of 20°C, and the low-humidity side held at a humidity of 50% ± 5% and a temperature of 20°C, and left to stand for 8 hours, after which both chambers were left to stand in an environment of 50% ± 5% humidity and a temperature of 20°C for 16 hours. This 24-hour cycle was considered as one cycle, and humidification was repeated five times. At this time, the maximum displacements in the vertical, horizontal and diagonal directions were measured. The results are shown in Table 3. [Table 3]

[0088] This has enabled us to verify that it is possible to provide moisture-proof decorative panels and doors and other fittings that can prevent warping even when used in places where there is a large difference in temperature and humidity environments on both sides, which is the objective of this invention. [Explanation of symbols]

[0089] 10 Moisture-proof decorative paper 11 Back moisture-proof sheet A 12 Back moisture-proof sheet B 20 decorative paper 21 Paper base material 22 Printed pattern layer 23 Protective resin layer 30 Moisture barrier 31 Anchor coat layer 32 Layer containing polyvinyl alcohol resin 33 Vapor deposited layer 34 Overcoat layer 40 Adhesive primer layer 100 Moisture-proof decorative paper A 101 Moisture-proof decorative paper B 110 Plate base material 120 Core assembly member

Claims

1. A moisture-proof decorative paper having a moisture-proof layer laminated on the back surface of the decorative paper, The decorative paper is formed by laminating a paper base material, a print pattern layer, and a protective resin layer in this order, The moisture-proof layer is On the back side of the paper base material, an anchor coat layer containing a first polyolefin which is a polyolefin copolymer having a monomer unit having a salt of a carboxyl group; a deposition layer; an overcoat layer comprising a second polyolefin which is a polyolefin copolymer having a monomer unit having a salt of a carboxyl group; In this order, A moisture-proof decorative paper characterized in that a layer containing a polyvinyl alcohol-based resin is provided between the paper substrate and the anchor coat layer or between the anchor coat layer and the vapor-deposited layer.

2. 2. The moisture-proof decorative paper according to claim 1, wherein the thickness of the anchor coat layer is 1 μm or more and 5 μm or less.

3. 3. The moisture-proof decorative paper according to claim 1, wherein the thickness of the layer containing the polyvinyl alcohol resin is 1 μm or more and 5 μm or less.

4. 4. The moisture-proof decorative paper according to claim 1, wherein the thickness of the vapor-deposited layer is 30 nm or more and 100 nm or less.

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

6. 6. The moisture-proof decorative paper according to claim 1, wherein the weight of the paper is 50% by mass or more based on the weight of the entire moisture-proof layer.

7. 7. The moisture-proof decorative paper according to claim 1, wherein an adhesive primer layer is provided on the exposed surface of the moisture-proof layer.

8. The moisture-proof decorative paper according to any one of claims 1 to 7, wherein the paper base material is a reinforced inter-paper paper.

9. The moisture-proof decorative paper according to any one of claims 1 to 8 is stuck to the surface of a board substrate, and the moisture permeability is 5 g / m ２ A moisture-proof decorative board characterized in that a back moisture-proof sheet having a shelf life of 24 hours or less is attached to the back side of the board substrate.

10. the back surface moisture-proof sheet comprises, on a paper substrate, an anchor coat layer containing a first polyolefin which is a polyolefin copolymer having a monomer unit having a carboxyl salt; a vapor deposition layer; and an overcoat layer containing a second polyolefin which is a polyolefin copolymer having a monomer unit having a carboxyl salt, in this order; 10. The moisture-proof decorative board according to claim 9, further comprising a moisture-proof layer containing a polyvinyl alcohol resin between the paper substrate and the anchor coat layer or between the anchor coat layer and the vapor deposition layer.

11. A fixture characterized in that the moisture-proof decorative board according to claim 9 or 10 is pressure-bonded to the front and back surfaces of a wooden core member with the back moisture-proof sheet side facing inward.

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