Moistureproof decorative paper and decorative plate

Abstract

To provide moisture proof decorative paper capable of reducing a used amount of a plastic material which has a high water vapor barrier property even after bent, and suppresses occurrence of cracking when applied to a V-cut part (V-cut processing), and a decorative plate.SOLUTION: Moistureproof decorative paper 10 includes a paper base material 1, an anchor coat layer 2, a vapor-deposited layer 3, an adhesive layer 4, and a sealant layer 5, in this order, wherein the anchor coat layer 2 contains at least one of a polyvinyl alcohol-based resin and polyolefin having a polar group.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present disclosure relates to moisture-proof decorative papers used for fittings or furniture such as interior doors, kitchen doors, storage doors, closets, etc., as well as moldings, battens, etc., and decorative boards using the same. Specifically, it relates to a moisture-proof decorative paper having a function of preventing warping of decorative boards and the like caused by humidity changes, temperature changes, etc., and having little reduction in moisture-proof performance even when bent.

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 caused by the occurrence of a humidity difference and a temperature difference between the inside and outside of the room, resulting in a bias in the moisture content distribution inside the wooden fittings. That is, when a humidity difference occurs, there is a difference 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. Also, 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 work in the same direction, it is considered that the warping becomes most prominent.

[0003] As a method for suppressing the warping of such wooden fittings, a method of reducing the amount of moisture absorption and desorption of the members by using a moisture-proof sheet with low water vapor permeability for the members of the fittings is widely used. Also, in Patent Document 1, a moisture-proof decorative sheet having a five-layer structure of a surface protection layer / pattern printing layer / base paper layer (paper base material) / synthetic resin layer (moisture-proof resin layer) / base paper layer is adhered to the surface side of a board base material such as plywood via an adhesive, and on the back side of the board base material, a moisture-proof back sheet having a three-layer structure of a base paper layer / synthetic resin layer (moisture-proof resin layer) / base paper layer is adhered via an adhesive to form a moisture-proof decorative board, and it is proposed to adhere this moisture-proof decorative board to the front and back of a flush door via an adhesive, respectively. At this time, the water vapor permeability of the moisture-proof sheet is preferably 5 (g / m2·24h) or more and 30 (g / m2·24h) or less.

[0004] On the other hand, since the sizes and areas of fine members such as furniture, moldings, and ledges are smaller than those of doors, and the amount of moisture absorption and desorption of the members is not large, the surface material does not necessarily need to be a moisture-proof decorative sheet used for wooden furniture. For example, decorative paper may be used. In recent years, due to the increasing environmental awareness triggered by issues such as marine plastic waste problems, the movement to eliminate plastics has been growing. From the perspective of promoting the effective use of resources based on the Act on Promotion of Effective Use of Resources, in order to reduce the amount of plastic materials used, in various fields, the use of paper instead of plastic materials has been considered. Regarding the above-mentioned fine members that do not require moisture-proof performance, if the occurrence of cracks in the constituent layer of the decorative paper serving as the surface material can be prevented, the moisture-proof resin layer of the moisture-proof decorative sheet, for example, the plastic film portion such as polyethylene can be eliminated, or the plastic film can be changed to paper, thereby reducing the amount of plastic materials used. For example, Patent Document 2 discloses a packaging material having a paper base material layer, an adhesive layer for dry lamination, and a specific sealant layer laminated adjacent to the adhesive layer for dry lamination.

Prior Art Documents

Patent Documents

[0005]

Patent Document 1

Patent Document 2

Summary of the Invention

Problems to be Solved by the Invention

[0006] Since paper has crease retention (also referred to as dead hold property), it has the characteristic of being easy to process. However, from the perspective of processing suitability (bending processing suitability), when applying decorative paper to building members by a building material processing method with a sharper fold line, it has been found that there is still room for improvement in that cracks occur in the layers constituting the decorative paper. For example, the above-mentioned fine members (peripheral edges, lintels, etc.) may be applied to the design of building materials with sharp fold lines called V-cuts (members with V-cut parts). There may also be V-cut parts in furniture. When using decorative paper without a moisture-proof resin layer for the V-cut part, cracks (fissures) may occur in the surface protection layer, ink layer, and base paper layer of the decorative paper. When cracks occur, problems such as the color of the base paper layer being visible from the V-cut part, the design being impaired by the cracks, and the yield decreasing and the amount of waste increasing due to processing defects during V-cut processing may occur.

[0007] To suppress the occurrence of cracks in the V-cut part, a moisture-proof decorative sheet having a synthetic resin layer (moisture-proof resin layer) or a synthetic resin sheet such as vinyl chloride, polyethylene, or polypropylene (90% by mass or more of plastic material) is used. In this case, however, the amount of plastic material used cannot be reduced. Furthermore, in moisture-proof decorative sheets that impart warp prevention (moisture-proof performance) to furniture such as interior doors, kitchen doors, and storage doors, it is also required to reduce the amount of plastic material used. In addition, if it is a decorative paper that can be suitably used for both furniture (such as interior doors, kitchen doors, and storage doors) and fine members such as furniture, peripheral edges, and lintels, inventory management of the sheets and reduction of waste at the end sizes can be achieved.

[0008] The present disclosure has been made to solve the above-mentioned problems in the prior art, and it is an object to provide a moisture-proof decorative paper capable of reducing the amount of plastic material used, having a high water vapor barrier property even after being bent, and suppressing the occurrence of cracks during application to the V-cut part (during V-cut processing), and a decorative board.

Means for Solving the Problems

[0009] In order to solve the above problems, a moisture-proof cosmetic paper according to one aspect of the present disclosure includes a paper substrate, an anchor coat layer, a vapor deposition layer, an adhesive layer, and a sealant layer in this order, and the anchor coat layer contains at least one of a polyvinyl alcohol-based resin and a polyolefin having a polar group. Further, in order to solve the above problems, a decorative board according to one aspect of the present disclosure includes a substrate and the moisture-proof cosmetic paper attached to the substrate.

Advantages of the Invention

[0010] According to one aspect of the present disclosure, there is provided a moisture-proof cosmetic paper capable of reducing the amount of plastic material used, having a high water vapor barrier property even after being bent, and suppressing the occurrence of cracks when applied to a V-cut portion (during V-cut processing).

Brief Description of the Drawings

[0011]

Figure 1

Figure 2

Modes for Carrying Out the Invention

[0012] Hereinafter, embodiments of the present disclosure 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 configurations for embodying the technical idea of the present disclosure, and the technical idea of the present disclosure does not specify the materials, shapes, etc. of the constituent parts as the following. The technical idea of the present disclosure can be variously modified within the technical scope defined by the claims described in the claims.

[0013] Furthermore, the following embodiments illustrate configurations for embodying the technical idea of the present disclosure, and the technical idea of the present disclosure does not specify the materials of the components, their shapes, structures, arrangements, etc. as the following. The technical idea of the present disclosure can be variously modified within the technical scope defined by the claims described in the claims. Also, the directions of "left and right" and "up and down" in the following description are merely definitions for convenience of explanation and do not limit the technical idea of the present disclosure. Therefore, for example, if the paper surface is rotated 90 degrees, "left and right" and "up and down" are read in exchange, and if the paper surface is rotated 180 degrees, it goes without saying that "left" becomes "right" and "right" becomes "left".

[0014] <Moisture-proof cosmetic paper> FIG. 1 is a cross-sectional view schematically showing a moisture-proof cosmetic paper according to an embodiment of the present disclosure. As shown in this figure, the moisture-proof cosmetic paper 10 according to this embodiment includes a paper base material 1, an anchor coat layer 2, a vapor deposition layer 3, an adhesive layer 4, and a sealant layer 5 in this order. The anchor coat layer 2 contains at least one of a polyvinyl alcohol-based resin and a polyolefin having a polar group. Also, the moisture-proof cosmetic paper 10 may be provided with a cosmetic layer in which a pattern printing layer 6 and a surface protection layer 7 are laminated in this order on the sealant layer 5 (that is, on the surface of the sealant layer 5 opposite to the paper base material 1). In FIG. 1, the case where the moisture-proof cosmetic paper 10 of this embodiment is attached to a substrate 9 to form a decorative board 20 is illustrated. The substrate 9 and the decorative board 20 will be described later.

[0015] <Paper base material> The material of the paper base material 1 is not particularly limited and may be appropriately selected according to the use of the moisture-proof cosmetic paper 10 to be applied. There is no particular limitation as long as it is paper mainly composed of plant-derived pulp. Specific examples of the material used for the paper base material 1 include tissue paper, art paper, cast-coated paper, kraft paper, titanium paper, linter paper, cardboard, gypsum board paper, high-quality paper, special high-quality paper, coated paper, sulfuric acid paper, glassine paper, parchment paper, paraffin paper, Japanese paper, imitation paper, and the like. Further, tissue paper (so-called inter-paper strengthened paper) in which synthetic resin is mixed with paper components (for example, cellulose fibers) to strengthen the inter-paper strength, or paper impregnated with latex or synthetic resin may be used. Furthermore, for the paper base material 1 using these materials, surface treatment such as corona treatment, plasma treatment, frame treatment, etc. may be performed as necessary.

[0016] The basis weight of the paper base material 1 is not particularly limited, but when it is less than 20 g / m 2 in the following cases, it is too soft and wrinkles are likely to occur during processing. When it is 200 g / m 2 or more, peeling from the paper layer (so-called delamination) is likely to occur. Therefore, it is preferably in the range of 20 g / m 2 or more and 200 g / m 2 or less. More preferably, it is in the range of 20 g / m 2 or more and 100 g / m 2 or less. Even more preferably, it is in the range of 25 g / m 2 or more and 70 g / m 2 or less.

[0017] 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. 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, compared with conventional moisture-proof members such as synthetic resin sheets (90% by mass or more of plastic materials) such as vinyl chloride, polyethylene, and polypropylene, or moisture-proof sheets made of paper / polyethylene / paper (although it depends on the thickness of polyethylene, 50% by mass or more is polyethylene in order to have moisture-proof performance), the amount of plastic used is small, so the proportion of the plastic material contained in the moisture-proof cosmetic paper can be sufficiently reduced. In addition, since 50% by mass or more is a paper material, the moisture-proof cosmetic paper 10 according to the present embodiment can be said to be made of paper (indicating that it is "made of paper"), and it is also excellent in recyclability.

[0018] A coating layer (not shown) may be provided on the paper base material 1 at least on the side in contact with the anchor coat layer 2 described later. By providing the coating layer, it is possible to prevent the anchor coat layer from penetrating into the paper. In addition, the coating layer can also serve as a caulking to fill the unevenness of the paper, and the anchor coat layer can be formed into a film uniformly without defects. As a result, the moisture-proof cosmetic paper 10 is more excellent in water vapor barrier properties. For the coating layer, for example, as a binder resin, various copolymers such as styrene-butadiene-based, styrene-acrylic-based, ethylene-vinyl acetate-based, polyvinyl alcohol-based resins, cellulose-based resins, paraffin (WAX), etc. are used, and fillers such as clay, kaolin, calcium carbonate, talc, mica, etc. may be included.

[0019] Also, for the coating layer, for example, an ink containing an acrylic resin as a binder may be used. As the acrylic resin contained as the binder, for example, acrylate copolymer resins mainly composed of ethylene-methyl acrylate copolymer resin (EMA), ethylene-ethyl acrylate copolymer resin (EEA), ethylene-methacrylic acid copolymer resin (EMAA), ethylene-acrylic acid copolymer resin (EAA), ionomer resin, or a mixture thereof can be used. Here, the "main component" refers to the component with the highest content among the components constituting the coating layer.

[0020] In addition, the coating layer may be a layer formed by coating an ink containing a urethane resin as a binder. As the urethane resin, a urethane-based one obtained by reacting an acrylic polyol and an isocyanate may be used. For the isocyanate, for example, tolylene diisocyanate (TDI), xylylene diisocyanate (XDI), hexamethylene diisocyanate (HMDI), diphenylmethane diisocyanate (MDI), lysine diisocyanate (LDI), isophorone diisocyanate (IPDI), methylhexane diisocyanate (HTDI), methylcyclohexanone diisocyanate, trimethylhexamethylene diisocyanate (TMDI), etc. can be appropriately selected. Considering weather resistance, it is preferable to use hexamethylene diisocyanate (HMDI) having a linear molecular structure. The thickness of the coating layer is not particularly limited, but may be, for example, 1 to 15 μm, or 3 to 10 μm.

[0021] <Anchor coating layer> The anchor coat layer 2 is provided on the surface of the paper base material 1 and is provided for improving the adhesion between the paper base material 1 and the vapor deposition layer 3 described later and for improving the gas barrier property of the moisture-proof tissue paper. The anchor coat layer 2 contains at least one of a polyvinyl alcohol-based resin and a polyolefin having a polar group. Thereby, the moisture-proof tissue paper 10 is excellent in gas barrier property (particularly, water vapor barrier property). Since the anchor coat layer 2 is further excellent in water vapor barrier property and oxygen barrier property, it preferably contains a polyvinyl alcohol-based resin. The anchor coat layer 2 may contain both a polyvinyl alcohol-based resin and a polyolefin having a polar group, or may contain only one of a polyvinyl alcohol-based resin and a polyolefin having a polar group.

[0022] By the anchor coat layer 2 containing a polyolefin having a polar group, it is possible to form a dense film due to the crystallinity of the polyolefin, and the water vapor barrier property is exhibited. The water vapor barrier property is exhibited due to the crystallinity of the polyolefin, and the adhesion to the vapor deposition layer 3 is exhibited due to having a polar group.

[0023] The polyolefin having a polar group may have at least one selected from the group consisting of a carboxyl group, a salt of a carboxyl group, a carboxylic anhydride, and a carboxylic acid ester.

[0024] As the polyolefin having a polar group, those obtained by copolymerizing ethylene or propylene with an unsaturated carboxylic acid (an unsaturated compound having a carboxyl group such as acrylic acid, methacrylic acid, maleic anhydride, etc.) or an unsaturated carboxylic acid ester, and salts obtained by neutralizing a carboxylic acid with a basic compound may be used, and in addition, those copolymerized with vinyl acetate, an epoxy compound, a chlorine compound, a urethane compound, a polyamide compound, etc. may also be used. Specific examples of the polyolefin having a polar group include a copolymer of an acrylate and maleic anhydride, an ethylene-vinyl acetate copolymer, an ethylene-glycidyl methacrylate copolymer, and the like.

[0025] Polyvinyl alcohol-based resins include, for example, 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-based resin is preferably 300 or more and 1700 or less. If the degree of polymerization is 300 or more, the water vapor barrier property and bending resistance of the moisture-proof cosmetic paper will be good. If the degree of polymerization is 1700 or less, the viscosity of the coating solution of the polyvinyl alcohol-based resin described later will be low, and the coating suitability will be good.

[0026] In addition, when the anchor coat layer 2 contains a polyvinyl alcohol-based resin, it has excellent flexibility, can suppress cracking of the vapor deposition layer described later after bending (folding), suppress deterioration of the water vapor barrier property, and can improve the adhesion between the vapor deposition layer and the anchor coat layer 2. The total content of the polyolefin having a polar group and the polyvinyl alcohol-based resin in the anchor coat layer 2 may be, for example, 50% by mass or more, preferably 70% by mass or more, more preferably 90% by mass or more, and even more preferably 100% by mass.

[0027] The anchor coat layer 2 may contain other components in addition to the polyolefin having a polar group and the polyvinyl alcohol-based resin. Examples of other components include resins such as polyolefins other than the polyolefin having a polar group, polyacryl, polyester, polyurethane, polyethyleneimine, polylactic acid, polyamide, starch and its derivatives, and cellulose derivatives, and additives such as silane coupling agents, organic titanates, glycerin, glycols, casein, and waxes. That is, the anchor coat layer 2 may contain at least one of the resin and the additive in addition to at least one of the polyolefin having a polar group and the polyvinyl alcohol-based resin.

[0028] The thickness of the anchor coat layer 2 may be, for example, in the range of 1 μm or more and 20 μm or less, more preferably in the range of 2 μm or more and 10 μm or less, and even more preferably in the range of 2 μm or more and 5 μm or less. If the thickness of the anchor coat layer 2 is 1 μm or more, the unevenness of the paper base material 1 described above can be efficiently filled, and the vapor deposition layer 3 described later can be uniformly laminated. Further, if the thickness of the anchor coat layer 2 is 20 μm or less, the vapor deposition layer 3 can be uniformly laminated while suppressing costs.

[0029] Examples of the solvent contained in the coating liquid of 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 viewpoint of the environment, methyl alcohol, ethyl alcohol, isopropyl alcohol, and water are preferable.

[0030] As a method for providing the anchor coat layer 2 on the paper base material 1, it can be obtained by applying a coating liquid containing at least one of the above-mentioned polyolefin and polyvinyl alcohol-based resin and a solvent on the paper base material and drying it. From the viewpoint of preventing blocking, the particle size of the polyolefin in the coating liquid is preferably larger so that the contact area becomes smaller. Although not particularly limited, specifically, the particle size may be in the range of 0.1 μm or more and 1 μm or less, more preferably in the range of 1 nm or more and 0.7 μm or less, and even more preferably in the range of 1 nm or more and 0.5 μm or less.

[0031] <Vapor deposition layer> The vapor deposition layer 3 is a layer formed by vapor depositing a metal or an inorganic compound. The material of the vapor deposition layer may be obtained by vapor depositing aluminum, or may contain aluminum oxide (AlOx), silicon oxide (SiOx), etc.

[0032] The thickness of the vapor deposition layer 3 may be appropriately set according to the intended use, but is preferably in the range of 10 nm or more and 300 nm or less, more preferably in the range of 30 nm or more and 100 nm or less, and even more preferably in the range of 50 nm or more and 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, and by setting it to 300 nm or less, the occurrence of curling and cracking can be sufficiently suppressed, and it is easy to achieve sufficient water vapor barrier performance and flexibility.

[0033] The vapor deposition layer 3 is preferably formed by a vacuum film forming means from the viewpoints of oxygen gas barrier performance, water vapor barrier performance, and film uniformity. Known methods such as vacuum evaporation, sputtering, and chemical vapor deposition (CVD) are available as film forming means, but the vacuum evaporation method is preferred because of its high film forming speed and high productivity. Among the vacuum evaporation methods, in particular, the film forming means by electron beam heating is effective because it is easy to control the film forming speed 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.

[0034] <Adhesive layer> The adhesive 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. As the adhesive layer 4, various materials can be used as long as they can adhere the vapor deposition layer 3 and the sealant layer 5. Examples include cured products of urethane-based adhesives and cured products of epoxy-based adhesives.

[0035] 〔Urethane-based adhesive〕 The urethane-based adhesive is a resin composition containing a polyol having two or more hydroxyl groups in one molecule and an isocyanate compound having two or more isocyanate groups in one molecule. A urethane bond is formed by curing the urethane-based adhesive. The urethane-based adhesive is preferably a two-component curing type.

[0036] The urethane-based adhesive may have gas barrier properties. Examples of methods for imparting gas barrier properties to the urethane-based adhesive include, for example, a method using a polyol having a gas barrier skeleton, a method of incorporating a phosphate-modified compound into the resin composition, and a method of incorporating a plate-like inorganic compound into the resin composition. These methods can be used alone or in combination of two or more methods.

[0037] As the polyol having a barrier skeleton, it is preferable that the main skeleton is polyester or polyester polyurethane and the polyester contains a structure derived from ortho-oriented aromatic dicarboxylic acid or its anhydride. The polyester portion of the main skeleton may be obtained by polycondensing a polycarboxylic acid and a polyhydric alcohol.

[0038] Examples of the polycarboxylic acid include aliphatic polycarboxylic acids and aromatic polycarboxylic acids. Examples of the aliphatic polycarboxylic acid include succinic acid, adipic acid, azelaic acid, sebacic acid, dodecanedicarboxylic acid, and 1,4-cyclohexanedicarboxylic acid.

[0039] Examples of the aromatic polycarboxylic acid include phthalic acid, terephthalic acid, isophthalic acid, pyromellitic acid, trimellitic acid, 1,2-naphthalenedicarboxylic acid, 1,8-naphthalenedicarboxylic acid, 2,3-naphthalenedicarboxylic acid, 1,4-naphthalenedicarboxylic acid, 2,5-naphthalenedicarboxylic acid, 2,6-naphthalenedicarboxylic acid, naphthalic acid, biphenyldicarboxylic acid, 1,2-bis(phenoxy)ethane-p,p'-dicarboxylic acid, and anhydrides of these dicarboxylic acids, and polybasic acids such as p-hydroxybenzoic acid and p-(2-hydroxyethoxy)benzoic acid. The polycarboxylic acid can be used alone or in combination of two or more.

[0040] As the polyvalent carboxylic acid, an ortho-oriented aromatic dicarboxylic acid or its anhydride is preferable. The content of the ortho-oriented aromatic dicarboxylic acid or its anhydride is preferably 70% by mass or more and 100% by mass or less based on the total amount of the polyvalent carboxylic acid component constituting the polyester.

[0041] Examples of the ortho-oriented aromatic dicarboxylic acid include phthalic acid, 1,2-naphthalenedicarboxylic acid, 1,8-naphthalenedicarboxylic acid, 2,3-naphthalenedicarboxylic acid, and anhydrides of these dicarboxylic acids.

[0042] Examples of the polyhydric alcohol include aliphatic polyhydric alcohols and aromatic polyhydric phenols. Examples of the aliphatic polyhydric alcohol include ethylene glycol, propylene glycol, butylene glycol, neopentyl glycol, cyclohexanedimethanol, 1,5-pentanediol, 3-methyl-1,5-pentanediol, 1,6-hexanediol, methylpentanediol, dimethylbutanediol, butylethylpropanediol, diethylene glycol, triethylene glycol, tetraethylene glycol, dipropylene glycol, and tripropylene glycol.

[0043] Examples of the aromatic polyhydric phenol include hydroquinone, resorcinol, catechol, naphthalenediol, biphenol, bisphenol A, bisphenol F, and tetramethylbiphenol, and ethylene oxide adducts and hydrogenated alicyclics thereof.

[0044] The isocyanate compound may be an aromatic having an aromatic ring, an aliphatic having no aromatic ring, a low molecular compound or a high molecular compound, and may be a diisocyanate compound having two isocyanate groups or a polyisocyanate compound having three or more isocyanate groups. The isocyanate compound may be a blocked isocyanate compound obtained by adding an isocyanate blocking agent by an addition reaction.

[0045] From the viewpoint of the adhesiveness of the adhesive layer 4, polyisocyanate compounds are preferred as the isocyanate compounds. Since the isocyanate compounds impart water vapor barrier properties to the adhesive layer 4, those having an aromatic ring are preferred, and in particular, isocyanate compounds containing a metaxylene skeleton are preferred.

[0046] Examples of the isocyanate compounds include tetramethylene diisocyanate, hexamethylene diisocyanate, toluene diisocyanate, diphenylmethane diisocyanate, hydrogenated diphenylmethane diisocyanate, metaxylylene diisocyanate, hydrogenated xylylene diisocyanate, isophorone diisocyanate, and trimers of these isocyanate compounds. These isocyanate compounds can be, for example, adducts, burettes, or allophanates obtained by reacting low molecular weight active hydrogen compounds such as ethylene glycol, propylene glycol, metaxylylene alcohol, 1,3-bis(hydroxyethyl)benzene, 1,4-bis(hydroxyethyl)benzene, trimethylolpropane, glycerol, pentaerythritol, erythritol, sorbitol, ethylenediamine, monoethanolamine, diethanolamine, triethanolamine, metaxylylene diamine, and alkylene oxide adducts thereof, various polyester resins, polyether polyols, and high molecular weight active hydrogen compounds such as polyamides with isocyanate compounds.

[0047] 〔Epoxy-based Adhesive〕 The epoxy-based adhesive is a resin composition containing an epoxy resin and an epoxy resin curing agent.

[0048] The epoxy resin may have a saturated bond or an unsaturated bond and may be any of an aliphatic compound, an alicyclic compound, an aromatic compound, or a heterocyclic compound. To exhibit higher water vapor barrier properties, an epoxy resin containing an aromatic ring or an alicyclic structure in the molecule is preferred.

[0049] Examples of the epoxy resin include an epoxy resin having a glycidylamino group derived from metaxylylenediamine, an epoxy resin having a glycidylamino group derived from 1,3-bis(aminomethyl)cyclohexane, an epoxy resin having a glycidylamino group derived from diaminodiphenylmethane, an epoxy resin having a glycidylamino group and / or a glycidyloxy group derived from para-aminophenol, an epoxy resin having a glycidyloxy group derived from bisphenol A, an epoxy resin having a glycidyloxy group derived from bisphenol F, an epoxy resin having a glycidyloxy group derived from phenol novolac, and an epoxy resin having a glycidyloxy group derived from resorcinol. The epoxy resin may be used alone or in combination of two or more. From the viewpoint of water vapor barrier properties, an epoxy resin having a glycidylamino group derived from metaxylylenediamine and an epoxy resin having a glycidyloxy group derived from bisphenol F are preferable, and an epoxy resin having a glycidylamino group derived from metaxylylenediamine is more preferable.

[0050] The epoxy resin curing agent may be a reaction product of metaxylylenediamine or para-xylylenediamine with an unsaturated carboxylic acid represented by the following formula (1) and / or its derivative.

[0051] [Chemical formula] [In formula (1), R1 represents an alkyl group having 1 to 8 carbon atoms, an aralkyl group having 1 to 8 carbon atoms, or an aryl group.]

[0052] By using metaxylylenediamine or para-xylylenediamine as a precursor of the epoxy resin curing agent, the water vapor barrier property is further improved. From the viewpoint of water vapor barrier properties, metaxylylenediamine is preferable. Metaxylylenediamine or para-xylylenediamine may be used alone or in combination of two or more.

[0053] By using the unsaturated carboxylic acid represented by the above formula (1) and / or its derivative as a precursor of an epoxy resin curing agent, good adhesiveness is exhibited. Examples of the unsaturated carboxylic acid and / or its derivative represented by the above formula (1) include crotonic acid, 2-pentenoic acid, 2-hexenoic acid, 4-methyl-2-pentenoic acid, 2-heptenoic acid, 4-methyl-2-hexenoic acid, 5-methyl-2-hexenoic acid, 4,4-dimethyl-2-pentenoic acid, 4-phenyl-2-butenoic acid, cinnamic acid, o-methylcinnamic acid, m-methylcinnamic acid, p-methylcinnamic acid, 2-octenoic acid, 2-nonenoic acid, 2-decenoic acid, 2-undecenoic acid and other unsaturated carboxylic acids, and derivatives thereof (for example, esters, amides, acid anhydrides, acid chlorides, etc.), but are not particularly limited thereto. The unsaturated carboxylic acid and / or its derivative represented by the above formula (1) may be used alone or in combination of two or more.

[0054] The unsaturated carboxylic acid and / or its derivative represented by the above formula (1) is preferably at least one selected from the group consisting of an unsaturated carboxylic acid in which R1 in the above formula (1) is a hydrocarbon group having 1 to 3 carbon atoms or a phenyl group and its derivative in order to further improve the water vapor barrier property and adhesiveness. More preferably, at least one selected from the group consisting of crotonic acid and crotonic acid derivatives, and even more preferably at least one selected from the group consisting of crotonic acid and crotonic acid esters. As the crotonic acid ester, an alkyl ester having 1 to 3 carbon atoms is more preferable, and methyl crotonate is even more preferable.

[0055] The adhesive layer 4 may be formed using a one-component curing type or two-component curing type adhesive (dry lamination method), may be formed using a solventless adhesive (non-solvent dry lamination method), or may be formed by extruding a molten resin onto the surface of the vapor deposition layer 3 (extrusion lamination method).

[0056] From the perspective of improving the adhesiveness of the adhesive layer 4, the thickness of the adhesive layer 4 is preferably 0.01 μm or more, and from the perspective of further reducing the amount of plastic material used, it is preferably 10 μm or less.

[0057] <Sealant layer> The sealant layer 5 is provided on the surface of the adhesive layer 4 so as to be in contact with the adhesive layer 4. Examples of the material of the sealant layer 5 include thermoplastic resins such as polyolefin resins and polyester resins, and polyolefin resins are generally used. Specifically, as the polyolefin resin, ethylene-based resins such as low-density polyethylene resin (LDPE), medium-density polyethylene resin (MDPE), linear low-density polyethylene resin (LLDPE), ethylene-vinyl acetate copolymer (EVA), ethylene-α-olefin copolymer, and ethylene-(meth)acrylic acid copolymer, homopolypropylene resin (PP), propylene-ethylene random copolymer, propylene-ethylene block copolymer, propylene-α-olefin copolymer and other polypropylene-based resins, or mixtures thereof can be used.

[0058] From the perspective of improving the adhesion strength, the thickness of the sealant layer 5 is preferably 5 μm or more, and from the perspective of further reducing the amount of plastic material used, it is preferably 50 μm or less.

[0059] <Pattern printing layer> The pattern printing layer 6 is for imparting design properties, and any pattern can be used as the pattern. Generally speaking, the pattern printing layer 6 is composed of a base coloring layer 6a formed on the sealant layer 5 and a pattern pattern layer 6b formed on the base coloring layer 6a for adding a pattern for imparting design properties. As the pattern of the pattern printing layer 6 by the pattern pattern layer 6b, 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. The under-coloring layer 6a may be a solid ink layer provided between the pattern printing layer 6 and the sealant layer 5 to ensure concealment, or it may be a coloring layer for emphasizing the pattern of the pattern layer 6b. Also, the under-coloring layer 6a may be omitted. 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.

[0060] There is no particular limitation on the printing ink or the like, and it is selected according to the required functions, and there is no particular problem whether it is oil-based or water-based. The printing ink or the like used for the pattern printing layer 6 can be the same as that 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.

[0061] Furthermore, biomass ink manufactured using plant-derived resources such as cotton, pulp, rice bran, vegetable oil, and seeds of angiosperms as part of the raw materials can be used.

[0062] <Surface protection layer> The surface protection layer 7 that functions as a surface protection layer is a layer for protecting the surface of the moisture-proof decorative paper 10, and is provided to impart surface physical properties such as scratch resistance, abrasion resistance, stain resistance, water resistance, and weather resistance required for the moisture-proof decorative paper 10. The formation of the surface protection layer 7 is not particularly limited, and it can be formed by a known coating method such as gravure coating.

[0063] The material of the surface protection layer 7 is not particularly limited, and the same materials as those used as the surface protection layer in conventional decorative papers can be used. As the material that can be used for the surface protection layer 7, 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 as the main agent and an isocyanate compound as the 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.

[0064] The surface protection layer 7 may be a single layer or a multi-layer of two or three layers. In this example, the surface protection layer 7 has a two-layer structure in which a first protection layer 7a and a second protection layer 7b as the outermost layer are laminated in this order on the pattern printing layer 6. When the surface protection layer 7 is a multi-layer, a gloss-matte expression can also be imparted by painting with a matte resin and a gloss resin (for example, painting of each of the first protection layer 7a and the second protection layer 7b). Further, an uneven expression with the resin partially raised can also be imparted. In this example, an uneven expression is imparted by providing the second protection layer 7b with the resin partially raised on the first protection layer 7a. Furthermore, an antibacterial agent, an antiviral agent, or the like can also be added to the surface protection layer 7.

[0065] As described above, the embodiments of the present disclosure have been described in detail, but the present disclosure is not limited to the above embodiments. For example, in the moisture-proof decorative paper 10, a coating layer may be provided between the vapor deposition layer 3 and the adhesive layer 4 as a layer for protecting the vapor deposition layer 3. Examples of the material of such a coating layer include polyvinyl alcohol-based resins, polyolefin-based resins, polyester-based resins, polyurethane-based resins, and epoxy-amine-based resins.

[0066] <Decorative board> As described above, the moisture-proof decorative paper 10 of the present embodiment is suitable for applications to building materials and fixtures such as interior doors, kitchen doors, storage doors, and closets. Furthermore, it is most suitable for uses on members including V-cut processing such as doors, furniture, edge strips, and baseboards. That is, the moisture-proof decorative paper 10 is preferably used as a decorative board as a surface material having a moisture-proof function. As shown in FIG. 1, the decorative board 20 includes a base material 9 (an example of a substrate) and the moisture-proof decorative paper 10 attached to the base material 9. In the present embodiment, the base material 9 is, for example, a wood-based base material. As the wood-based base material, for example, wood-based base materials such as MDF (Medium density fiberboard), particle board, and plywood can be used.

[0067] FIG. 2 is a schematic cross-sectional view showing a decorative board 20 formed by adhering the moisture-proof decorative paper 10 to the base material 9 and performing V-cut processing. For example, in the decorative board 20, the paper base material 1 of the moisture-proof decorative paper 10 and the base material 9 are adhered. In the V-cut processed decorative board 20, the base material 9 has bent portions 30 (bent portions 31, 33). The bent portion 30 is a location on the base material 9 where the moisture-proof decorative paper 10 is bent. The bent portion 31 is a corner portion that protrudes at a right angle (so-called pin corner). Further, the bent portion 33 is a location where the moisture-proof decorative paper 10 is valley-folded in an inverted V shape as viewed from the innermost layer (paper base material 1) side of the moisture-proof decorative paper 10. On the other hand, the bent portion 31 (pin corner) is a location where the moisture-proof decorative paper 10 is mountain-folded as viewed from the innermost layer side.

[0068] The decorative board 20 shown in FIG. 2 may be a member that is formed by adhering the paper base material 1 side of the moisture-proof decorative paper 10 to one base material 9 (wood-based base material), then grooving the opposite side of the base material 9 from the moisture-proof decorative paper 10 in a V shape and assembling it according to the groove, or may be a member formed by grooving one side of the base material 9 in a V shape and then adhering the moisture-proof decorative paper 10 to the member assembled according to the groove. That is, the decorative board 20 may be V-cut processed on the base material 9 after attaching the moisture-proof decorative paper 10 to the base material 9, or the moisture-proof decorative paper 10 may be attached to the pre-V-cut processed base material 9. Further, the decorative board 20 may be one in which the moisture-proof decorative paper 10 is adhered to a base material 9 having a shape with a cross-section that draws a curve.

[0069] The decorative board 20 according to this embodiment can be used for fittings that require warpage prevention, such as interior doors, kitchen doors, and storage doors. Further, the decorative board 20 according to this embodiment can maintain high water vapor barrier properties even when it is a building member processed into a shape having a more acute bending portion.

[0070] In this embodiment, as an example of the base material 9 in the decorative board 20, a V-cut processed member is cited, but it is not limited to this. Using the moisture-proof decorative paper 10 according to this embodiment, for example, the base material 9 may be subjected to wrapping processing.

[0071] (Effect of the embodiment) (1) The moisture-proof decorative paper 10 according to this embodiment includes a paper base material 1, an anchor coat layer 2, a vapor deposition layer 3, an adhesive layer 4, and a sealant layer 5 in this order, and the anchor coat layer 2 contains at least one of a polyvinyl alcohol-based resin and a polyolefin having a polar group. According to this configuration, the amount of plastic material used in the moisture-proof decorative paper can be reduced, and it has a high water vapor barrier property even after being bent, and the generation of cracks during application to the V-cut portion (during V-cut processing) can be suppressed. (2) The anchor coat layer 2 in the moisture-proof decorative paper 10 contains a polyolefin having a polar group, and the polyolefin having a polar group may have at least one of a carboxyl group, a salt of a carboxyl group, a carboxylic anhydride, and a carboxylic acid ester. According to this configuration, the water vapor barrier property is exhibited by the crystallinity of the polyolefin, and the adhesion to the vapor deposition layer 3 is improved by having a polar group. (3) The anchor coat layer 2 in the moisture-proof decorative paper 10 contains a polyolefin having a polar group, and the polyolefin having a polar group may be a copolymer of an acrylic acid ester and maleic anhydride. According to this configuration, the water vapor barrier property is exhibited due to the crystallinity of the polyolefin, and the adhesion to the vapor deposition layer 3 is improved by having polar groups. (4) The anchor coat layer 2 in the moisture-proof cosmetic paper 10 contains a polyolefin having polar groups, and the polyolefin having polar groups may be an ethylene-vinyl acetate copolymer. According to this configuration, the water vapor barrier property is exhibited due to the crystallinity of the polyolefin, and the adhesion to the vapor deposition layer 3 is improved by having polar groups. (5) The anchor coat layer 2 in the moisture-proof cosmetic paper 10 contains a polyolefin having polar groups, and the polyolefin having polar groups may be an ethylene-glycidyl methacrylate copolymer. According to this configuration, the water vapor barrier property is exhibited due to the crystallinity of the polyolefin, and the adhesion to the vapor deposition layer 3 is improved by having polar groups. (6) The anchor coat layer 2 in the moisture-proof cosmetic paper 10 may contain a polyvinyl alcohol-based resin. According to this configuration, excellent flexibility is imparted, cracking of the vapor deposition layer 3 after bending (after folding) can be suppressed to suppress deterioration of the water vapor barrier property, and the adhesion between the vapor deposition layer 3 and the anchor coat layer 2 can be improved.

[0072] (7) The adhesive layer 4 in the moisture-proof cosmetic paper 10 is a cured product of a resin composition containing an epoxy resin and an epoxy resin curing agent, and the epoxy resin curing agent may be a reaction product of metaxylylenediamine or paraxylylenediamine and the unsaturated carboxylic acid and / or its derivative represented by the above formula (1). According to this configuration, the water vapor barrier property can be further improved. (8) The adhesive layer 4 in the moisture-proof cosmetic paper 10 may be a cured product of a resin composition containing a polyol having two or more hydroxyl groups in one molecule and an isocyanate compound having two or more isocyanate groups in one molecule. According to this configuration, the adhesion between the vapor deposition layer 3 and the sealant layer 5 can be surely improved.

[0073] (9) The mass of the paper base material 1 in the moisture-proof cosmetic paper 10 may be 50% by mass or more based on the mass of the entire moisture-proof cosmetic paper. According to this configuration, the proportion of the plastic material contained in the moisture-proof cosmetic paper can be sufficiently reduced, and it is also excellent in recyclability. (10) The moisture-proof cosmetic paper 10 may further include a decorative layer in which a pattern printing layer 6 and a surface protection layer 7 are laminated in this order on the sealant layer 5. According to this configuration, the design property and the surface physical properties of the moisture-proof cosmetic paper can be improved. (11) The decorative board 20 includes a substrate 9 and a moisture-proof cosmetic paper 10 attached to the substrate 9. According to this configuration, it is possible to reduce the amount of the plastic material used in the moisture-proof cosmetic paper 10 used for the decorative board 20, and further, it has a high water vapor barrier property even after being bent, and can suppress the occurrence of cracks when applied to the V-cut portion (during V-cut processing). (12) The decorative board 20 may have a bent portion 30 in the substrate 9. According to this configuration, the occurrence of cracks can be suppressed even in fine members, and the water vapor barrier property can be improved while maintaining the design property.

Example

[0074] Hereinafter, the present disclosure will be described in more detail with reference to examples, but the present disclosure is not limited to these examples.

[0075] <Production of moisture-proof cosmetic paper> (Example 1) On the surface of paper serving as a paper base material (clay-coated paper, paper thickness: 50 μm, clay coating layer thickness: 5 μm, basis weight: 55 g / m2), a coating liquid containing a salt of a carboxyl group (trade name: Chem Pearl S100, ionomer type, particle size: <0.1 μm, solvent: water, IPA, manufactured by Mitsui Chemicals) was coated with a bar coater and dried in an oven to form an anchor coat layer (thickness: 3 μm). AL vapor deposition was performed on the anchor coat layer to form a vapor deposition layer (thickness: 50 nm). On the vapor deposition layer, a linear low-density polyethylene resin (LLDPE) film (trade name: TUX-MCS, manufactured by Mitsui Chemicals Tohcellulose Co., Ltd., thickness: 30 μm) as a sealant layer was dry laminated using an adhesive (trade name: Takelac A525 / Takenate A52, urethane-based two-component type, manufactured by Mitsui Chemicals, Inc.) to obtain a moisture-proof cosmetic paper. The thickness of the adhesive layer was 5 μm. The mass of the paper in the entire moisture-proof cosmetic paper of this example was 53% by mass.

[0076] (Example 2) A moisture-proof cosmetic paper was obtained in the same manner as in Example 1, except that an anchor coat layer was formed using a polyolefin aqueous dispersion instead of the coating liquid containing a salt of a carboxyl group. The polyolefin aqueous dispersion was prepared by neutralizing a copolymer of an acrylate ester and maleic anhydride (trade name: Bondine HX-8290, manufactured by Arkema) with triethylamine in a water / IPA mixed solvent. Note that maleic anhydride partially or completely opens its ring in an aqueous solvent to become a carboxylic acid, but after drying, it partially or completely dehydrates again and cyclizes. The mass of the paper in the entire moisture-proof cosmetic paper of this example was 53% by mass.

[0077] (Example 3) A moisture-proof cosmetic paper was obtained in the same manner as in Example 1, except that the anchor coat layer was formed using an ethylene-glycidyl methacrylate copolymer (trade name: Sepoljone G515, manufactured by Sumitomo Seika) instead of the coating liquid containing a salt of a carboxyl group. The mass of the paper in the entire moisture-proof cosmetic paper of this example was 53% by mass.

[0078] (Example 4) A moisture-proof cosmetic paper was obtained in the same manner as in Example 1, except that the anchor coat layer was formed using a coating solution composed of an ethylene-vinyl acetate copolymer (trade name: Chem Pearl V300, manufactured by Mitsui Chemicals, Inc.) instead of a coating solution containing a salt of a carboxyl group. The mass of the paper in the entire moisture-proof cosmetic paper of this example was 53% by mass.

[0079] (Example 5) A moisture-proof cosmetic paper was obtained in the same manner as in Example 1, except that the vapor deposition layer was changed to silica instead of AL. The mass of the paper in the entire moisture-proof cosmetic paper of this example was 53% by mass.

[0080] (Example 6) A moisture-proof cosmetic paper was obtained in the same manner as in Example 1, except that the adhesive layer was formed using an epoxy-based adhesive having gas barrier properties (trade name: Maxieve M-100 / C-93, manufactured by Mitsubishi Gas Chemical Company, Inc.) instead of a two-component urethane type (Takelac A525 / Takenate A52). The mass of the paper in the entire moisture-proof cosmetic paper of this example was 53% by mass.

[0081] (Example 7) A moisture-proof cosmetic paper was obtained in the same manner as in Example 1, except that the adhesive layer was formed using a urethane-based adhesive having gas barrier properties (trade name: PASLIM VM001 / 108CP, manufactured by DIC Corporation) instead of a two-component urethane type (Takelac A525 / Takenate A52). The mass of the paper in the entire moisture-proof cosmetic paper of this example was 53% by mass.

[0082] (Example 8) In the same manner as in Example 1, an anchor coat layer was formed on the surface of the paper, and an Al vapor deposition layer was formed on the anchor coat layer. On the vapor deposition layer, a linear low-density polyethylene resin (LLDPE) film (trade name: TUX-MCS, manufactured by Mitsui Chemicals Toagosei Co., Ltd., thickness: 30 μm) was formed as the sealant layer in the same manner as in Example 1. At that time, a moisture-proof cosmetic paper was obtained in the same manner as in Example 1, except that a solventless adhesive having gas barrier properties (trade name: NSRD011 / NSRD006, manufactured by DIC Corporation) was used as the adhesive layer, and the sealant layer was non-solvent dry laminated on the vapor deposition layer. The thickness of the adhesive layer was 5 μm. The mass of the paper in the entire moisture-proof cosmetic paper of this example was 53% by mass.

[0083] (Example 9) In the same manner as in Example 1, an anchor coat layer was formed on the surface of the paper, and an Al vapor deposition layer was formed on the anchor coat layer. A polyurethane-based adhesive (trade name: A-3210 / A-3075, manufactured by Mitsui Chemicals, Inc.) was extruded as the adhesive layer on the vapor deposition layer, and a moisture-proof cosmetic paper was obtained in the same manner as in Example 1, except that the vapor deposition layer and a low-density polyethylene resin (LDPE) film (trade name: Novattic LC-600A, manufactured by Japan Polyethylene Corporation) as the sealant layer were laminated via the above polyurethane-based adhesive. The thickness of the adhesive layer was 5 μm. The mass of the paper in the entire moisture-proof cosmetic paper was 57% by mass.

[0084] (Example 10) A moisture-proof cosmetic paper was obtained in the same manner as in Example 1, except that the anchor coat layer was formed using a polyvinyl alcohol-based resin (saponification degree: 98%, polymerization degree: 500) instead of the coating liquid containing a salt of a carboxyl group. The mass of the paper in the entire moisture-proof cosmetic paper was 53% by mass.

[0085] (Example 11) A moisture-proof cosmetic paper was obtained in the same manner as in Example 1, except that the anchor coat layer was formed using a polyvinyl alcohol-based resin (saponification degree: 88%, polymerization degree: 500) instead of the coating liquid containing a salt of a carboxyl group. The mass of the paper in the entire moisture-proof cosmetic paper was 53% by mass.

[0086] (Example 12) A moisture-proof cosmetic paper was obtained in the same manner as in Example 1, except that the anchor coat layer was formed using a modified polyvinyl alcohol-based resin (trade name: Exceval AQ4104, manufactured by Kuraray Co., Ltd.) instead of the coating liquid containing a salt of a carboxyl group. The mass of the paper in the entire moisture-proof cosmetic paper was 53% by mass.

[0087] (Example 13) A moisture-proof cosmetic paper was obtained in the same manner as in Example 10, except that the vapor deposition layer was made of silica instead of AL. The mass of the paper in the entire moisture-proof cosmetic paper was 53% by mass.

[0088] (Example 14) A moisture-proof cosmetic paper was obtained in the same manner as in Example 10, except that the adhesive layer was formed using a solvent-free laminating adhesive (trade name: EA-N370A / B, manufactured by Toyo Ink Co., Ltd.) instead of a two-component urethane-based adhesive (Takelac A525 / Takenate A52). The mass of the paper in the entire moisture-proof cosmetic paper was 53% by mass.

[0089] (Example 15) A polyurethane-based adhesive (A-3210 / A-3075, manufactured by Mitsui Chemicals, Inc.) was extruded as an adhesive layer onto the vapor deposition layer, and the vapor deposition layer and a low-density polyethylene resin (LDPE) film (trade name: Novatic LC-600A, manufactured by Japan Polyethylene Corporation) as a sealant layer were laminated via the above polyurethane-based adhesive (A-3210 / A-3075) in the same manner as in Example 10 to obtain a moisture-proof cosmetic paper. The thickness of the adhesive layer was 0.2 μm. The mass of the paper in the entire moisture-proof cosmetic paper was 57% by mass.

[0090] (Comparative Example 1) The anchor coat layer was made of a urethane-curable acrylic resin that is a cured product of an acrylic polyol (an acrylic polyol is a polymer of an acrylic acid derivative monomer or a polymer of an acrylic acid derivative monomer and other monomers, and has a hydroxyl group at the end), the thickness of the adhesive layer was 0.2 μm, and a moisture-proof cosmetic paper was obtained in the same manner as in Example 1 except that a low-density polyethylene resin (LDPE) film (trade name: Novatic LC-600A, manufactured by Nippon Polyethylene Co., Ltd.) was used as the sealant layer. The mass of the paper in the entire moisture-proof cosmetic paper was 57% by mass.

[0091] (Comparative Example 2) A moisture-proof cosmetic paper was obtained in the same manner as in Comparative Example 1 except that the thickness of the anchor coat layer was 1 μm. The mass of the paper in the entire moisture-proof cosmetic paper was 57% by mass.

[0092] The following measurement and evaluation results are shown in Tables 1 to 3 described later together with the configurations of the moisture-proof cosmetic papers of each example and comparative example.

[0093] <Measurement of Water Vapor Permeability> The water vapor permeability of the moisture-proof cosmetic papers according to each example and comparative example was measured by the MOCON method. The measurement conditions were a temperature of 40°C and a relative humidity of 90%. While rolling a 600 g roller at a speed of 300 mm / min, a crease was made on the moisture-proof cosmetic paper, and after opening, the water vapor permeability of the moisture-proof cosmetic paper was also measured in the same manner. "Outer fold" in Tables 1 to 3 indicates the moisture-proof cosmetic paper after valley-folding the moisture-proof cosmetic paper as viewed from the paper base material side. The results in Tables 1 to 3 are expressed in the unit [g / m 2 ·day].

[0094] <Measurement of Oxygen Permeability> The oxygen permeability of the moisture-proof cosmetic papers according to each example and comparative example was measured by the JIS K7126, Method B (isobaric method). The measuring device used was OXTRAN 2 / 20 manufactured by MOCON, and the measurement was carried out at a temperature of 30°C and a relative humidity of 70%. The results in Tables 1 to 3 are shown in the unit [cc / m 2 / d / atm].

[0095] <Observation of the Bent Part of the Cosmetic Board> The moisture-proof cosmetic papers according to each example and comparative example were adhered to one side of a wood-based substrate (MDF) using a two-component adhesive, and then a V-shaped groove was cut, and the wood-based substrate was folded along the groove to create a V-cut processed member. The surface state and the presence or absence of cracks of the moisture-proof cosmetic paper on the inverted V portion and the pin angle portion of the V-cut processed member were visually observed.

[0096]

Table 1

[0097]

Table 2

[0098]

Table 3

[0099] As shown in Tables 1 to 3, the moisture-proof cosmetic papers 10 of Examples 1 to 15 had low water vapor permeability not only before (before bending) but also after bending, and had good water vapor barrier properties. In this example, the water vapor permeability was 5 g / m 2 · If it was 24 h or less both before bending and after bending of the moisture-proof cosmetic paper 10, it was evaluated as "qualified" because it had sufficient water vapor barrier properties and there was no problem in use. On the other hand, if the water vapor permeability of either before bending or after bending of the moisture-proof cosmetic paper 10 exceeded 5 g / m 2 · When it exceeded 24 h, it was evaluated as "unqualified" because the water vapor barrier properties were not sufficient and there might be a problem in use. Furthermore, in the moisture-proof cosmetic papers 10 of Examples 1 to 15, no cracks occurred even in the bent portion after V-cut processing.

[0100] Also, as shown in Tables 1 to 3, the moisture-proof cosmetic paper 10 of the examples (Examples 10 to 15) using a polyvinyl alcohol-based resin for the anchor coat layer has a low oxygen permeability of 1.5 cc / m 2 / d / atm or less not only in the initial stage (before folding) but also after folding, and has good oxygen barrier properties.

[0101] Thus, according to the moisture-proof cosmetic paper according to the embodiment of the present disclosure, the amount of plastic material used can be reduced, and it has a high water vapor barrier property even after being folded, and the generation of cracks during application to the V-cut portion (during V-cut processing) can be expected to be suppressed.

[0102] Further, for example, the present disclosure can take the following configurations. (1) Comprising a paper base material, an anchor coat layer, a vapor deposition layer, an adhesive layer, and a sealant layer in this order, The anchor coat layer contains at least one of a polyvinyl alcohol-based resin and a polyolefin having a polar group, a moisture-proof cosmetic paper. (2) The anchor coat layer contains the polyolefin having a polar group, The polyolefin having a polar group has at least one of a carboxyl group, a salt of a carboxyl group, a carboxylic anhydride, and a carboxylic acid ester, the moisture-proof cosmetic paper according to (1) above. (3) The anchor coat layer contains the polyolefin having a polar group, The polyolefin having a polar group is a copolymer of an acrylate and maleic anhydride, the moisture-proof cosmetic paper according to (1) above. (4) The anchor coat layer contains the polyolefin having a polar group, The polyolefin having a polar group is an ethylene-vinyl acetate copolymer, the moisture-proof cosmetic paper according to (1) above. (5) The anchor coat layer contains the polyolefin having a polar group, The moisture-proof cosmetic paper according to (1) above, wherein the polyolefin having the polar group is an ethylene-glycidyl methacrylate copolymer. (6) The moisture-proof cosmetic paper according to any one of claims 1 to 5, wherein the anchor coat layer contains the polyvinyl alcohol-based resin. (7) The adhesive layer is a cured product of a resin composition containing an epoxy resin and an epoxy resin curing agent, The moisture-proof cosmetic paper according to any one of (1) to (6) above, wherein the epoxy resin curing agent is a reaction product of metaxylylenediamine or paraxylylenediamine and an unsaturated carboxylic acid represented by the above formula (1) and / or a derivative thereof. (8) The moisture-proof cosmetic paper according to any one of (1) to (6) above, wherein the adhesive layer is a cured product of a resin composition containing a polyol having two or more hydroxyl groups in one molecule and an isocyanate compound having two or more isocyanate groups in one molecule. (9) The moisture-proof cosmetic paper according to any one of (1) to (8) above, wherein the mass of the paper base material is 50% by mass or more based on the mass of the entire moisture-proof cosmetic paper. (10) The moisture-proof cosmetic paper according to any one of (1) to (9) above, further comprising a cosmetic layer in which a pattern printing layer and a surface protection layer are laminated in this order on the sealant layer. (11) A substrate, A decorative board comprising the substrate and the moisture-proof cosmetic paper according to any one of (1) to (10) above attached to the substrate. (12) The decorative board according to (11) above, wherein the substrate has a bent portion.

Explanation of reference numerals

[0103] 10 Moisture-proof cosmetic paper 1 Paper base material 2 Anchor coat layer 3 Vapor deposition layer 4 Adhesive layer 5 Sealant layer 6 Pattern printing layer 6a Undercoat coloring layer 6b Pattern layer 7 Surface protection layer 7a First protection layer 7b Second protection layer 20 Decorative board 9 Base material

Claims

1. A moisture-proof cosmetic paper comprising a paper substrate, an anchor coat layer, a vapor deposition layer, an adhesive layer, and a sealant layer in this order, wherein the anchor coat layer contains at least one of a polyvinyl alcohol-based resin and a polyolefin having a polar group.

2. The moisture-proof cosmetic paper according to claim 1, wherein the anchor coat layer contains the polyolefin having a polar group, and the polyolefin having a polar group has at least one of a carboxyl group, a salt of a carboxyl group, a carboxylic anhydride, and a carboxylic acid ester. The moisture-proof cosmetic paper according to claim 1.

3. The moisture-proof cosmetic paper according to claim 1, wherein the anchor coat layer contains the polyolefin having a polar group, and the polyolefin having a polar group is a copolymer of an acrylate ester and maleic anhydride. The moisture-proof cosmetic paper according to claim 1.

4. The moisture-proof cosmetic paper according to claim 1, wherein the anchor coat layer contains the polyolefin having a polar group, and the polyolefin having a polar group is an ethylene-vinyl acetate copolymer. The moisture-proof cosmetic paper according to claim 1.

5. The moisture-proof cosmetic paper according to claim 1, wherein the anchor coat layer contains the polyolefin having a polar group, and the polyolefin having a polar group is an ethylene-glycidyl methacrylate copolymer.

6. The moisture-proof cosmetic paper according to claim 1, wherein the anchor coat layer contains the polyvinyl alcohol-based resin.

7. The moisture-proof cosmetic paper according to claim 1, wherein the adhesive layer is a cured product of a resin composition containing an epoxy resin and an epoxy resin curing agent, and the epoxy resin curing agent is a reaction product of metaxylylenediamine or p-xylylenediamine and an unsaturated carboxylic acid represented by the following formula (1) and / or a derivative thereof. 【Chemical Formula 1】 [In formula (1), R1 represents an alkyl group having 1 to 8 carbon atoms, an aralkyl group having 1 to 8 carbon atoms, or an aryl group.]

8. The moisture-proof cosmetic paper according to claim 1, wherein the adhesive layer is a cured product of a resin composition containing a polyol having two or more hydroxyl groups in one molecule and an isocyanate compound having two or more isocyanate groups in one molecule.

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

10. The moisture-proof cosmetic paper according to claim 1, further comprising a decorative layer in which a pattern printing layer and a surface protection layer are laminated in this order on the sealant layer. The moisture-proof cosmetic paper according to claim 1.

11. A substrate, A decorative board comprising the moisture-proof cosmetic paper according to any one of claims 1 to 10 attached to the substrate.

12. The decorative board according to claim 11, wherein the substrate has a bent portion.

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