Moisture-proof foam wallpaper

Abstract

To provide moisture-proof foam wallpaper having high heat resistance during embossing procedure and capable of being used without causing drying and peeling of a paste, even when stored for a long time after pasting in construction.SOLUTION: Moisture-proof foam wallpaper 1 comprises a substrate 2, a foam resin layer 7 laminated on the substrate 2, a printed design layer 8 laminated on the foam resin layer 7, and a surface protective layer 9 laminated on the printed design layer 8. The foam resin layer 7 is formed mainly from a water-based emulsion resin, the substrate 2 is made up of a paper layer 3, an anchor coat layer 4, a vapor-deposited layer 5, and an overcoat layer 6, which are laminated in this order. The anchor coat layer 4 and the overcoat layer 6 are in contact with the vapor-deposited layer 5, and the overcoat layer 6 is arranged in contact with the foam resin layer 7. In the cross-section of the substrate 2 in the thickness direction, the softening temperature of the anchor coat layer 4, measured by local thermal analysis, is 180 [°C] or higher.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a moisture-proof foamed wallpaper used for wall decoration of buildings and the like.

Background Art

[0002] The current non-PVC wallpaper with an emulsion specification is a wallpaper characterized by not having problems such as residual solvent components and a large amount of plasticizer addition that common PVC wallpapers have in the market. Since this current non-PVC wallpaper has high moisture permeability, it has the characteristic of quickly releasing the moisture of the construction paste applied to the back surface to the surface layer via the backing paper. This characteristic causes the paste on the back surface to dry quickly after pasting, and in the case of performing construction after long-term storage, there is a phenomenon of losing adhesiveness, and there is also a risk of causing a trouble called "peeling off" where the paste surfaces on the back surface adhere to each other and peel off when they are overlapped.

[0003] Since wallpaper construction requires good adhesion to starch-based construction paste, a substrate without adhesion such as aluminum foil cannot be used. Also, since peeling work occurs during renovation or demolition, it is desirable to use pulp-based paper with high peelability. However, ordinary paper has high moisture permeability and water absorbency and easily shows moisture on the surface. Conventionally, as a wallpaper having moisture-proof properties and enabling trouble-free construction, a wallpaper in which a backing paper, a resin layer, a moisture-proof non-woven fabric layer, and the like are laminated is known (see Patent Document 1).

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] By the way, the conventional wallpaper-related technologies have focused on imparting high moisture permeability to wallpapers for the purpose of improving the living environment, and no technology has been developed to deliberately reduce the moisture permeability. However, due to the continuous decrease in the number of construction workers in recent years, it is not possible to allocate time for on-site immediate work such as pasting wallpaper on-site and sticking it immediately. Instead, most of the work forms involve applying paste to most of the wallpapers all at once before entering the site and bringing them in, or carrying over the unused wallpapers to the next day for use. The storage stability of high moisture permeability wallpapers has become a major issue.

[0006] As one of the solutions, a method of using highly moisture-proof paper as the backing paper can be considered. However, since the wallpaper is subjected to heat far exceeding 100 [°C] in the embossing process for imparting the surface shape, there is a problem that the moisture-proof backing paper deteriorates. The present invention has been made in view of the above circumstances, and an object thereof is to provide a moisture-proof foamed wallpaper having high moisture-proof properties and capable of withstanding long-term storage even after applying construction paste.

Means for Solving the Problems

[0007] In order to solve the above problems, one aspect of the present invention includes a base material, a foamed resin layer laminated on the base material, a pattern printing layer laminated on the foamed resin layer, and a surface protection layer laminated on the pattern printing layer. The foamed resin layer is formed mainly of an aqueous emulsion resin. The base material has a paper layer, an anchor coat layer, a vapor deposition layer, and an overcoat layer laminated in this order, and the anchor coat layer and the overcoat layer are in contact with the vapor deposition layer, and the overcoat layer is provided in contact with the foamed resin layer. In the cross-section in the thickness direction of the base material, the softening temperature of the anchor coat layer measured by local thermal analysis is 180 [°C] or higher.

Effect of the Invention

[0008] According to one aspect of the present invention, it is possible to suppress the rapid drying of the paste during construction and the problem of peeling, and to obtain a moisture-proof foamed wallpaper having high moisture-proof properties and excellent workability.

Brief Description of the Drawings

[0009]

Figure 1

Embodiments for Carrying Out the Invention

[0010] Hereinafter, with reference to the drawings, one embodiment of the present invention will be described. In the description of the drawings referred to below, the same or similar parts are denoted by the same or similar reference numerals. However, it should be noted that the drawings are schematic, and the relationship between the thickness and the planar dimensions, the ratio of the thicknesses of the respective layers, etc. are different from the actual ones. Therefore, the specific thickness and dimensions should be determined in consideration of the following description. Also, it goes without saying that there are portions where the dimensional relationships and ratios are different between the drawings.

[0011] Furthermore, the embodiments shown below are 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 of the constituent parts, their shapes, structures, arrangements, etc. as the following. The technical idea of the present invention can be variously modified within the technical scope defined by the claims described in the claims. 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 invention. Therefore, for example, if the paper surface is rotated by 90 degrees, "left and right" and "up and down" are read in exchange, and if the paper surface is rotated by 180 degrees, "left" becomes "right" and "right" becomes "left", of course.

[0012] Hereinafter, the moisture-proof foamed wallpaper 1 according to one embodiment of the present invention will be described with reference to the drawings.

[0013] (Moisture-proof foamed wallpaper) As shown in FIG. 1, the moisture-proof foamed wallpaper 1 is formed by laminating a base material 2, a foamed resin layer 7, a pattern printing layer 8, and a surface protection layer 9 in this order.

[0014] (Base material) The base material 2 is a sheet-like layer formed to support the foamed resin layer. The paper material forming the base material 2 is formed by laminating a paper layer 3, an anchor coat layer 4, a vapor deposition layer 5, and an overcoat layer 6 in this order. The laminate of the anchor coat layer 4, the vapor deposition layer 5, and the overcoat layer 6 exhibits the function as a moisture-proof layer.

[0015] (Paper layer) The material of the paper layer 3 is not particularly limited and may be appropriately selected according to the application of the wallpaper to be applied. Specific examples of the paper layer 3 include fine paper, special fine paper, coated paper, art paper, cast coated paper, imitation paper, kraft paper, glassine paper, tissue paper, titanium paper, linter paper, cardboard, gypsum board paper, fine paper, sulfuric acid paper, parchment paper, paraffin paper, and Japanese paper.

[0016] The thickness of the paper layer 3 is, for example, 30 [μm] or more and 100 [μm] or less, and more preferably 30 [μm] or more and 70 [μm] or less. Further, the thickness of the paper layer 3 may be 70 [%] or more of the total thickness of the base material 2 having the function as a gas barrier laminate. If the thickness of the paper layer 3 is 70 [%] or more of the total thickness of the base material 2, it can be said that the environmental suitability is excellent. The mass of the paper layer 3 is preferably 50 [mass%] or more, more preferably 70 [mass%] or more, and even more preferably 80 [mass%] or more based on the total mass of the base material 2. If the mass of the paper layer 3 is 50 [mass%] or more based on the total mass of the base material 2, the usage amount of the plastic material can be sufficiently reduced, and it can be said that the entire base material 2 is made of paper. Further, such a base material 2 is excellent in recyclability.

[0017] Furthermore, these paper layers 3 may be subjected to surface treatments such as corona treatment, plasma treatment, and frame treatment as necessary. The paper layer 3 may be provided with a coating layer on at least the side in contact with the anchor coat layer 4 described later. That is, a coating layer (not shown) may be provided between the anchor coat layer 4 and the paper layer 3. By providing the coating layer, when forming the anchor coat layer 4, it is possible to prevent the coating liquid that will become the anchor coat layer 4 from penetrating into the paper material that will become the paper layer 3. In addition, it can also serve as a caulking function to fill the unevenness on the surface of the paper material that will become the paper layer 3, and the anchor coat layer 4 can be formed into a uniform film without defects. As the binder resin for the coating layer, for example, any one or more of various copolymers such as styrene-butadiene-based, styrene-acrylic-based, and ethylene-vinyl acetate-based, polyvinyl alcohol-based resins, cellulose-based resins, and paraffin (WAX) may be used. As the filler, for example, clay, kaolin, calcium carbonate, talc, mica, etc. may be included.

[0018] The thickness of the coating layer is not particularly limited, but may be, for example, in the range of 1 [μm] or more and 10 [μm] or less, or in the range of 3 [μm] or more and 8 [μm] or less.

[0019] (Anchor coat layer) The anchor coat layer 4 is provided on the surface of the paper layer 3 on the vapor deposition layer 5 side, and is provided to improve the adhesion between the paper layer 3 and the vapor deposition layer 5 and to improve the gas barrier property of the base material 2. The anchor coat layer 4 contains at least one kind of resin selected from epoxy resins, acrylic urethane resins, acrylic resins, polyester-based polyurethane resins, and polyether-based polyurethane resins. In addition, the anchor coat layer 4 contains at least one kind of polar group, may contain polyolefin, and may contain polyvinyl alcohol-based resin.

[0020] The total content of the resin having a polar group in the anchor coat layer 4 is, for example, 50 [mass%] or more, more preferably 70 [mass%] or more, still more preferably 90 [mass%] or more, and most preferably 100 [mass%] with respect to the mass of the entire anchor coat layer 4. The polyolefin having a polar group may have at least one selected from a carboxyl group, a salt of a carboxyl group, a carboxylic anhydride group, and a carboxylic acid ester.

[0021] For ethylene or propylene, those copolymerized 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. In addition, those copolymerized with vinyl acetate, an epoxy compound, a chlorine compound, a urethane compound, a polyamide compound, etc. may also be used.

[0022] Specific examples include copolymers of an acrylic acid ester and maleic anhydride, ethylene-vinyl oxide copolymers, ethylene-glycidyl methacrylate copolymers, etc. The polyvinyl alcohol-based resin is, for example, a completely saponified polyvinyl alcohol resin, a partially saponified polyvinyl alcohol resin, a modified polyvinyl alcohol resin, or an ethylene-vinyl alcohol copolymer resin. Also, the degree of polymerization of the polyvinyl alcohol-based resin is preferably 300 or more and 1700 or less. If the degree of polymerization is 300 or more, the gas barrier property and bending resistance of the gas barrier laminate 10 will be good. If the degree of polymerization is 1700 or less, the viscosity of the coating solution of the polyvinyl alcohol-based resin described later will be low and the coatability will be good.

[0023] The anchor coat layer 4 may contain other components in addition to the polyolefin having the polar group and the polyvinyl alcohol-based resin. Examples of other components include resins such as polyolefins other than the polyolefin having the polar group, polyacrylics, polyesters, polyurethanes, polycarbonates, polyureas, melamines, phenols, polyethyleneimines, polylactic acids, polyamides, polyimides, starch and its derivatives, and cellulose derivatives, as well as additives such as silane coupling agents, organic titanates, glycerin, glycols, casein, and waxes.

[0024] Since the anchor coat layer 4 contains a kind of polar group, the substrate 2 has excellent gas barrier properties. By containing a polyvinyl alcohol-based resin, it is even more excellent in water vapor barrier properties and oxygen barrier properties. By containing a polyolefin, it is possible to form a dense film due to the crystallinity of the polyolefin, and the water vapor barrier property is exhibited. The thickness of the anchor coat layer 4 is, for example, 1 [μm] or more, more preferably 2 [μm] or more. Also, the upper limit of the thickness of the anchor coat layer 4 may be 20 [μm] or less, more preferably 10 [μm] or less, and even more preferably 5 [μm] or less. If the thickness of the anchor coat layer 4 is 1 [μm] or more, the vapor deposition layer 5 can be laminated uniformly. The thicker the anchor coat layer, the more efficiently the unevenness of the substrate 2 can be filled, and the vapor deposition layer 5 can be laminated more uniformly. Also, if the thickness of the anchor coat layer 4 is 20 [μm] or less, each of the above layers can be laminated uniformly while suppressing the cost.

[0025] The anchor coat layer 4 has a softening temperature measured by differential thermal analysis of 180 [°C] or more, more preferably 185 [°C] or more, and even more preferably 190 [°C] or more. In particular, there is no upper limit to the softening temperature. If the softening temperature of the anchor coat layer 4 is 180 [°C] or more, a decrease in the denseness of the vapor deposition layer 5 can be suppressed. When the vapor deposition layer 5 is vapor-deposited, due to heat, for example, SiOx particles contained in the vapor deposition layer 5 cause the anchor coat layer 4 to soften and expand, resulting in macro cracks generated in the vapor deposition layer 5 and a decrease in the denseness of the vapor deposition layer 5. The higher the softening temperature of the anchor coat layer 4, the more it can be suppressed.

[0026] As a method for providing the anchor coat layer 4, it can be obtained by applying a coating liquid containing the constituent materials and solvent of the anchor coat layer 4 described above onto the paper layer 3 and drying it. Examples of the solvent 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 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.

[0027] (Vapor deposition layer) The vapor deposition layer 5 is a layer formed by vapor depositing an inorganic compound and may contain silicon oxide (SiOx) or the like. The thickness of the vapor deposition layer 5 may be appropriately set according to the intended use, but it is 10 [nm] or more, more preferably 20 [nm] or more, and even more preferably 30 [nm] or more. The upper limit of the thickness of the vapor deposition layer 5 is 100 [nm] or less, and more preferably 80 [nm] or less. By setting the thickness of the vapor deposition layer 5 to 10 [nm] or more, it is easy to make the continuity of the vapor deposition layer 5 sufficient, and by setting it to 100 [nm] or less, the occurrence of curling and cracking can be sufficiently suppressed, and it is easy to achieve sufficient gas barrier performance and flexibility.

[0028] By providing the vapor deposition layer 5, the base material 2 can obtain good water vapor barrier properties. The vapor deposition layer 5 is preferably formed by a vacuum film forming means from the viewpoints of water vapor and oxygen gas barrier performance and film uniformity. Known methods such as vacuum evaporation, sputtering, and chemical vapor deposition (CVD) can be used as the film forming means, but the vacuum evaporation method is preferred because of its high film forming speed and 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 of the vapor deposition material can be increased and decreased in a short time.

[0029] (Overcoat layer) The overcoat layer 6 is provided in contact with the vapor deposition layer 5 on the surface of the vapor deposition layer 5 opposite to the anchor coat layer 4. The overcoat layer 6 may contain a polyolefin having a polar group. The polyolefin having a polar group may have at least one selected from a carboxyl group, a salt of a carboxyl group, a carboxylic anhydride group, and a carboxylic acid ester.

[0030] Specifically, a copolymer of an acrylic acid ester and maleic anhydride, an ethylene-vinyl acetate copolymer, an ethylene-glycidyl methacrylate copolymer, etc. may be used.

[0031] By including a polyolefin having a polar group, the overcoat layer 6 is excellent in flexibility, can suppress cracking of the vapor deposition layer 5 after bending (after folding), and is excellent in adhesion to the vapor deposition layer 5. Furthermore, by including the above-mentioned polyolefin having a polar group, a substrate 2 excellent in water vapor barrier properties can be obtained. In addition, since the overcoat layer 6 can also serve as a heat seal layer by including the polyolefin having a polar group, it is not necessary to separately provide a heat seal layer.

[0032] The content of the polyolefin having a polar group in the overcoat layer 6 is, for example, 50 [mass%] or more, more preferably 70 [mass%] or more, more preferably 90 [mass%] or more, and 100 [mass%] is even more preferably, based on the total mass of the overcoat layer 6.

[0033] The overcoat layer 6 may contain other components in addition to the polyolefin having the polar group. Examples of the other components include silane coupling agents, organic titanates, polyacrylics, polyesters, polyurethanes, polycarbonates, polyureas, polyamides, polyolefin emulsions, polyimides, melamines, phenols, and the like.

[0034] The thickness of the overcoat layer 6 is, for example, 2 [μm] or more, and more preferably 3 [μm] or more. The upper limit of the thickness of the overcoat layer 6 is 10 [μm] or less, more preferably 8 [μm] or less, and even more preferably 5 [μm] or less. If the thickness of the overcoat layer 6 is 2 μm or more, the role as the heat-sealing layer described above can be sufficiently exhibited. Further, if the thickness of the overcoat layer 6 is 10 [μm] or less, the adhesiveness and barrier properties with the vapor deposition layer 5 can be sufficiently exhibited while suppressing the cost.

[0035] As a method for providing the overcoat layer 6, it can be obtained by applying a coating liquid containing the above-described polyolefin and a solvent on the vapor deposition layer 5 and drying it. Examples of the solvent 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 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. Further, from the viewpoint of the environment, methyl alcohol, ethyl alcohol, isopropyl alcohol, and water are preferable.

[0036] The polyolefins having polar groups contained in the anchor coat layer 4 and the overcoat layer 6 may be of the same kind or different kinds, but considering the ease of production and the like, it is preferable that they are of the same kind respectively.

[0037] (Foamed resin layer) The foamed resin layer 7 is laminated on the base material 2. Specifically, in FIG. 1, the foamed resin layer 7 is laminated on the upper surface of the base material 2.

[0038] Further, the foamed resin layer 7 contains a resin component, a filler, a foaming agent, a foaming aid, a resin content, an organic antibacterial agent, an additive, and an antibacterial agent, and is formed by the foaming agent foaming. The resin component contained in the foamed resin layer 7 contains an aqueous emulsion resin as a main component. That is, the foamed resin layer 7 is formed mainly of an aqueous emulsion resin.

[0039] As the filler contained in the foamed resin layer 7, for example, an inorganic filler can be used. Also, the inorganic filler can be used alone or in combination of two or more. As the inorganic filler, for example, calcium carbonate, titanium dioxide, kaolin, etc. can be used.

[0040] The foaming agent (volatile swelling agent) contained in the foamed resin layer 7 is preferably added to the resin component contained in the foamed resin layer 7 in the form of thermally expandable microcapsules from the viewpoint of performance (foaming ratio, strength). Also, as the foaming agent contained in the foamed resin layer 7, azo-based, hydrazide-based, nitroso-based, etc. can be used.

[0041] Also, pigments and the like may be added to the foamed resin layer 7 for coloring as necessary. Coloring by adding a pigment may be transparent, translucent, or opaque. As the pigment, for example, iron oxide, carbon black, etc. can be used. The addition amount of the pigment is preferably in the range of 5 [mass%] or more and 50 [mass%] or less, more preferably in the range of 10 [mass%] or more and 30 [mass%] or less, based on the mass of the entire foamed resin layer 7.

[0042] As the antibacterial agent contained in the foamed resin layer 7, since it is required to be soluble in water (water-soluble), for example, a thiazole-based agent can be used. In addition, as the antibacterial agent contained in the foamed resin layer 7, as long as it has water solubility, nitrile-based, imidazole-based, alcohol-based, aldehyde-based, (carboxylic acid-based, ester-based), disulfide-based, thiocarbamate-based, phenol-based, etc. can be used.

[0043] Furthermore, as the antibacterial agent contained in the foamed resin layer 7, as long as it has water solubility, pyridine·quinoline-based, triazine-based, isothiazolone-based, anilide-based, carboxylic acid-based, ether-based, peroxide·epoxy-based, biguanide-based, surfactant-based, etc. can be used.

[0044] As the flame retardant, for example, metal oxide-based flame retardants such as magnesium hydroxide and aluminum hydroxide, phosphorus-based flame retardants such as phosphate esters, bromine-based flame retardants such as tetrabromobisphenol A, etc. can be used.

[0045] (Pattern printing layer) The pattern printing layer 8 is laminated on the foamed resin layer 7. Specifically, in FIG. 1, the pattern printing layer 8 is laminated on the surface of the foamed resin layer 7 opposite to the overcoat layer 6.

[0046] In addition, the pattern printing layer 8 imparts design properties with a desired pattern to the moisture-proof foamed wallpaper 1, and the type of the pattern, etc. are not particularly limited. As the pattern, for example, it is possible to select a pattern suitable for the place where the moisture-proof foamed wallpaper 1 is used, such as a wood grain pattern, a stone grain pattern, a sand grain pattern, a tile pasted pattern, a brick stacked pattern, a cloth grain pattern, a leather grain pattern, geometric figures, letters, symbols, abstract patterns, etc.

[0047] The printing ink for forming the pattern printing layer 8 is not particularly limited as long as it satisfies the requirements for weather resistance, color development, and safety of the components used (such as not containing heavy metals and sulfur compounds as pigments and additives), which are generally required for wallpapers. Here, as an embodiment, the case where an aqueous ink based on an acrylic polymer is used as the printing ink for forming the pattern printing layer 8 will be described.

[0048] The printing ink for forming the pattern printing layer 8 is composed of the above aqueous emulsion, and by drying it after printing, it becomes a coating film of the pattern printing layer 8. In addition, the ink contains known pigments that constitute the pattern. Moreover, by combining and blending pigments in the printing ink for forming the pattern printing layer 8, it becomes possible to enrich the expression of the pattern. Also, by adding an ultraviolet absorber, a light stabilizer, etc. to the printing ink for forming the pattern printing layer 8, it is also possible to improve the weather resistance.

[0049] As the method for printing the pattern, for example, known printing methods such as gravure printing, offset printing, silk screen printing, inkjet printing, etc. can be used. In particular, when coloring the entire surface uniformly, in addition to the above-described printing methods, coating techniques and apparatuses may also be used.

[0050] (Surface protection layer) The surface protection layer 9 is laminated on the pattern printing layer 8 and is also called a coat layer (coating layer). Specifically, in FIG. 1, the surface protection layer 9 is laminated on the surface of the pattern printing layer 8 opposite to the foamed resin layer 7.

[0051] In addition, as a resin component other than the silicon-based resin, the surface protection layer 9 contains acrylic acid (CH 2 =CHCOOH) and methacrylic acid (CH 2 =C(CH 3A polymer formed from one or more monomers selected from (COOH) or their esters, or a polymer obtained by copolymerizing one or more monomers or block copolymers of styrene, vinyl acetate, ethylene, and α-olefin with the polymer is preferably included.

[0052] Note that the configuration of the surface protection layer 9 can also be a configuration including a resin such as polyvinyl chloride as a resin component other than the silicon-based resin. The basis weight of the surface protection layer 9 is 1.0 [g / m 2 or more and 30.0 [g / m 2 or less, preferably in the range. Furthermore, the basis weight of the surface protection layer 9 is more preferably 5.0 [g / m 2 or more and 25.0 [g / m 2 or less in the range.

[0053] Also, on the surface opposite to the surface facing the pattern printing layer 8 of the surface protection layer 9 (the upper surface of the surface protection layer 9 in FIG. 1), an uneven shape 10 by embossing is formed. As the uneven shape 10 by embossing, for example, cloth texture, wood grain plate conduit grooves, stone surface unevenness, cloth surface texture, satin finish, grained surface, hairline, multi-line grooves, etc. can be used and can be appropriately selected.

[0054] (Effect) The moisture-proof foamed wallpaper 1 according to an embodiment of the present invention can exhibit the following-described effects. (1) The moisture-proof foamed wallpaper 1 includes a base material 2 comprising a laminate of an anchor coat layer 4, a vapor deposition layer 5, and an overcoat layer 6 that exhibits the function as a moisture-proof layer. Therefore, high moisture-proof property can be imparted to the moisture-proof foamed wallpaper 1, preventing the moisture of the construction adhesive on the back surface from surfacing on the surface layer, and enabling it to withstand long-term storage after applying the construction adhesive. Further, the anchor coat layer 4 and the overcoat layer 6 are provided in contact with the vapor deposition layer 5, and in the cross-section of the base material 2 in the thickness direction, the softening temperature of the anchor coat layer 4 measured by differential scanning calorimetry is 180°C or higher. Therefore, it is possible to suppress the occurrence of macro cracks in the vapor deposition layer 5 and the decrease in the density of the vapor deposition layer 5 caused by the softening and elongation of the anchor coat layer 4 due to the member that becomes the vapor deposition layer 5 formed on the anchor coat layer when forming the vapor deposition layer 5, and further enhance the moisture-proof property.

[0055] Also, since the softening temperature of the anchor coat layer 4 is 180°C or higher, for example, when performing embossing, by processing at a temperature of about 170°C, it is possible to suppress the deterioration of the base material 2 due to the heat during embossing.

[0056] (2) Since the anchor coat layer has at least one of an epoxy resin, an acrylic urethane resin, an acrylic resin, a polyester-based polyurethane resin, and a polyether-based polyurethane resin, the effect of improving the adhesion can be obtained.

[0057] (3) Since the overcoat layer 6 contains a polyolefin having at least one polar group, the flexibility of the overcoat layer 6 can be enhanced. For example, it is possible to suppress the occurrence of cracks in the vapor deposition layer 5 after bending (folding). Also, it is possible to improve the adhesion between the overcoat layer 6 and the vapor deposition layer 5, and it can also serve as a heat-seal layer.

Example

[0058] Hereinafter, the present invention will be described more specifically by the moisture-proof foamed wallpaper of the example, but the present invention is not limited by the following examples at all.

[0059] (Example) The moisture-proof foamed wallpaper 1 of the example was configured as follows. ·Base material 2 On the clay-coated surface of paper (clay-coated paper, paper thickness: 50 μm, clay-coated layer thickness: 5 μm), a solution of polyepoxy resin was coated with a bar coater and dried in an oven to form an anchor coat layer with a thickness of 3 μm. The solution was prepared by mixing 24 parts by mass of Maxieve C93AT (manufactured by Mitsubishi Gas Chemical Company, Inc.) and 2 parts by mass of Maxieve M-100 (manufactured by Mitsubishi Gas Chemical Company, Inc.) in 17 parts by mass of a 1:1 mixed solvent of methanol and ethyl acetate. Subsequently, SiOx evaporation with a thickness of 30 nm was performed on the anchor coat layer to form a silica evaporation layer. On top of that, an aqueous dispersion of polyolefin containing a salt of a carboxyl group was coated with a bar coater and dried in an oven to form an overcoat layer with a thickness of 3 μm. Thus, a gas barrier laminate (base material 2) was obtained. The weight of the paper in the total weight of the gas barrier laminate was 82% by mass.

[0060] ·Foamed resin layer 7 Ethylene-vinyl acetate copolymer resin (EVA resin) was used as the main component, and 80 parts of calcium carbonate and 10 parts of a capsule foaming agent were added as fillers. Then, the foaming ratio was set to 5 times, and a foamed resin layer was formed on the overcoat layer so that the basis weight was 100 [g / m 2 . ·Pattern printing layer 8 Using an acrylic resin-based ink, a pattern printing layer was formed on the foamed resin layer 7 so that the coating amount was 2 [g / m 2 . ·Surface protection layer 9 Mainly composed of an acrylic resin and a silicone resin, it was formed on the foamed resin layer including the pattern printing layer so that the basis weight was 5 [g / m 2 . Thus, the moisture-proof foamed wallpaper of the example was created.

[0061] (Comparative example) (Comparative example 1) The moisture-proof foamed wallpaper of Comparative Example 1 was prepared in the same procedure as in the Example, except that ordinary paper with a basis weight of 65 [g / m 2 was used as the paper layer 3 of the base material 2.

[0062] (Comparative Example 2) For the moisture-proof foamed wallpaper of Comparative Example 2, clay-coated paper was used as the paper layer 3 of the base material 2. On the surface of the clay-coated paper, a coating solution in which a polyvinyl alcohol resin with a saponification degree of 98% and a polymerization degree of 500 was dissolved in a solvent of water·IPA = 8 / 2 was coated with a bar coater and dried in an oven to obtain an anchor coat layer 4 with a thickness of 3 μm. The vapor deposition layer 5 and the overcoat layer 6 were formed by the same operations as in the Example. The weight of the paper layer 3 in the total mass of the base material 2 was 83% by mass. Otherwise, the moisture-proof foamed wallpaper of Comparative Example 2 was prepared in the same procedure as in the Example.

[0063] (Comparative Example 3) A base material 2 was obtained in the same procedure as in Comparative Example 1, except that the thickness of the anchor coat layer 4 was 6 μm. The weight of the paper layer 3 in the total mass of the base material 2 was 78% by mass. Otherwise, the moisture-proof foamed wallpaper of Comparative Example 3 was prepared in the same procedure as in the Example.

[0064] (Comparative Example 4) A base material 2 was obtained in the same procedure as in Comparative Example 2, except that the anchor coat layer 4 was made of a polyolefin containing a salt of a carboxyl group. The weight of the paper layer 3 in the total mass of the base material 2 was 83% by mass. Otherwise, the moisture-proof foamed wallpaper of Comparative Example 4 was prepared in the same procedure as in the Example.

[0065] (Comparative Example 5) A base material 2 was obtained in the same procedure as in Comparative Example 2, except that the anchor coat layer 4 was made of a polyolefin containing a salt of a carboxyl group and the thickness was 6 μm. The weight of the paper layer 3 in the total mass of the base material 2 was 78% by mass. Otherwise, it was the same as in the Example.

[0066] (Performance Evaluation) For the moisture-proof foamed wallpaper of the Example and the moisture-proof foamed wallpapers of Comparative Examples 1 to 5, a moisture permeability and peeling confirmation test were respectively carried out.

[0067] ·Processing state When applying the concavo-convex shape 10 by embossing, the surface temperature was heated to 170 °C, and after processing, cross-sectional observation was performed to confirm the molten state of the resin. ·Moisture permeability It complied with JIS Z0208 "Test method for moisture permeability of moisture-proof packaging materials (cup method)". ·Peeling test On the side surface of the base material of the moisture-proof foamed wallpaper, a diluted paste obtained by diluting the starch paste "Luwamild" manufactured by Yayo Chemical Industry Co., Ltd. with paste: water = 55:45 was applied at 120 g / m 2 Apply, overlap the paste surfaces, seal them in a folded polyethylene bag, and after 24 hours, open the bag and check for breakage of the base material layer when the fold is opened. The evaluation results are shown in Table 1.

[0068]

Table 1

[0069] (Evaluation results) As is clear from the results in Table 1, the moisture-proof foamed wallpaper of the example had a significantly lower moisture permeability and no peeling occurred even after long-term storage compared to the moisture-proof foamed wallpapers of Comparative Examples 1 to 5. In Comparative Examples 2 to 5, moisture-proof base materials were used, but melting occurred in the base materials due to the heat during embossing, and sufficient effects were not obtained. The moisture-proof foamed wallpaper of the example was improved in the base material 2, and by setting the softening temperature of the anchor coat layer 4 to 180 °C or higher, it was possible to withstand the processing temperature while suppressing the moisture permeability, and the peeling prevention effect was recognized, and it was confirmed that it could withstand long-term storage at the construction site.

[0070] Note that the present invention can have, for example, the following configurations. (1) Comprising a base material, a foamed resin layer laminated on the base material, a pattern printing layer laminated on the foamed resin layer, and a surface protection layer laminated on the pattern printing layer, The foamed resin layer is formed mainly of an aqueous emulsion resin, The base material is laminated in this order with a paper layer, an anchor coat layer, a vapor deposition layer, and an overcoat layer, and the anchor coat layer and the overcoat layer are in contact with the vapor deposition layer, and the overcoat layer is provided in contact with the foamed resin layer. The moisture-proof foamed wallpaper is characterized in that, in a cross-section in the thickness direction of the base material, the softening temperature of the anchor coat layer measured by local thermal analysis is 180 [°C] or higher. (2) The moisture-proof foamed wallpaper according to (1) above is characterized in that the vapor deposition layer contains silicon oxide. (3) The moisture-proof foamed wallpaper according to (1) or (2) above is characterized in that the anchor coat layer has at least one of an epoxy resin, an acrylic urethane resin, an acrylic resin, a polyester-based polyurethane resin, and a polyether-based polyurethane resin. (4) The moisture-proof foamed wallpaper according to any one of (1) to (3) above is characterized in that the overcoat layer contains a polyolefin having at least one polar group. (5) The moisture-proof foamed wallpaper according to any one of (1) to (4) above is characterized in that the thickness of the vapor deposition layer is 10 [nm] or more and 100 [nm] or less. (6) The moisture-proof foamed wallpaper according to any one of (1) to (5) above is characterized in that the thickness of the overcoat layer is 2 [μm] or more and 10 [μm] or less. (7) The moisture-proof foamed wallpaper according to any one of (1) to (6) above is characterized in that the thickness of the paper layer is 30 [μm] or more and 100 [μm] or less, and is 70 [%] or more of the total thickness of the base material.

Explanation of symbols

[0071] 1... Moisture-proof foamed wallpaper, 2... Base material, 3... Paper layer, 4... Anchor coat layer, 5... Vapor deposition layer, 6... Overcoat layer, 7... Foamed resin layer, 8... Pattern printing layer, 9... Surface protection layer, 10... Concavo-convex shape

Claims

1. The present invention comprises a substrate, a foamed resin layer laminated on the substrate, a pattern printed layer laminated on the foamed resin layer, and a surface protective layer laminated on the pattern printed layer, The foamed resin layer is formed using an aqueous emulsion resin as a main component, the substrate has a paper layer, an anchor coat layer, a vapor deposition layer, and an overcoat layer laminated in this order, the anchor coat layer and the overcoat layer being in contact with the vapor deposition layer, and the overcoat layer being in contact with the foamed resin layer; A moisture-proof intumescent wallpaper, characterized in that the softening temperature of the anchor coat layer measured by local thermal analysis in a cross section in the thickness direction of the base material is 180° C. or higher.

2. 2. The moisture-proof foam wallpaper according to claim 1, wherein the vapor deposition layer contains silicon oxide.

3. 3. The moisture-proof foam wallpaper according to claim 1, wherein the anchor coat layer comprises at least one of an epoxy resin, an acrylic urethane resin, an acrylic resin, a polyester polyurethane resin, and a polyether polyurethane resin.

4. 3. The moisture-proof foam wallpaper according to claim 1, wherein the overcoat layer comprises a polyolefin having at least one polar group.

5. 3. The moisture-proof foam wallpaper according to claim 1, wherein the thickness of the vapor deposition layer is from 10 nm to 100 nm.

6. 3. The moisture-proof foam wallpaper according to claim 1, wherein the overcoat layer has a thickness of 2 [mu]m or more and 10 [mu]m or less.

7. 3. The moisture-proof foam wallpaper according to claim 1, wherein the thickness of the paper layer is 30 [μm] or more and 100 [μm] or less, and is 70 [%] or more of the total thickness of the base material.

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