JP2017155387A - Foamed wallpaper and method for producing foamed wallpaper - Google Patents

Abstract

PROBLEM TO BE SOLVED: To produce a single-layer plastic foam wallpaper having high strength, stain resistance and non-land concealment property. SOLUTION: The foamed wallpaper 10 includes a paper base material 1, a foamed resin layer 2 containing an aqueous emulsion resin, a foaming agent and an inorganic filler, a surface protective layer 4 containing an acrylic resin and a filler, and the like. Are laminated. The paper substrate 1 has a basis weight of 50 g / m2 or more and 100 g / m2 or less and a thickness of 80 μm or more and 150 μm or less. The foamed resin layer 2 has a basis weight of 50 g / m2 or more and 220 g / m2 or less and a foaming ratio of 3 times or more. The surface protective layer 4 has a basis weight of 5 g / m2 or more and 40 g / m2 or less. The total basis weight of the paper base material 1, the foamed resin layer 2, and the surface protection layer 4 is preferably 170 g / m2 or less. The foaming agent is preferably a heat-expandable microcapsule foaming agent. [Selection diagram] Fig. 1

Description

  The present invention relates to a foam wallpaper used for a building interior material such as a floor, a wall, and a ceiling, and a method for producing the foam wallpaper.

  Producing foamed wallpaper by cross-linking and then foaming a foamed resin layer of a laminated sheet (so-called foam wallpaper original) having at least a foamed resin layer laminated on a paper substrate (so-called wallpaper backing paper) Can do. As an example of such foam wallpaper, Patent Document 1 discloses a foam wallpaper having a paper base material, a resin layer, and a pattern layer, and improving the adhesion and surface rubbing characteristics of the pattern layer.

JP 2007-196590 A

  As a method of simultaneously providing design properties, product thickness, and surface properties such as strength and smoothness in the production method of foamed wallpaper, especially plastic-based foamed wallpaper, the resin layer is divided into a high foam layer and a low / non-foamed layer. Multi-layering has been performed. However, the multi-layered resin layer has a problem in that productivity is lowered such as complicated process and reduced line speed.

  The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a single-layer plastic foam wallpaper having high strength, stain resistance, and non-land concealment, and a method for producing the same.

In order to solve the above problems, a foam wallpaper according to one embodiment of the present invention includes a paper base, a foam resin layer containing an aqueous emulsion resin, a foaming agent, and an inorganic filler, an acrylic resin, and a filler. And a surface protective layer containing
The paper substrate has a basis weight of 50 g / m ^{2 to} 100 g / m ² and a thickness of 80 μm to 150 μm. The foamed resin layer has a basis weight of 50 g / m ² or more and 220 g / m ² or less and a foaming ratio of 3 times or more. The surface protective layer has a basis weight of 5 g / m ² or more and 40 g / m ² or less. The total basis weight of the paper substrate, the foamed resin layer, and the surface protective layer is preferably 170 g / m ² or less. The foaming agent is preferably a thermally expandable microcapsule foaming agent.

For example, in the method for producing foamed wallpaper according to one embodiment of the present invention, plain paper having a basis weight of 50 g / m ^{2 to} 100 g / m ² and a thickness of 80 μm to 150 μm is used as the paper substrate, and ethylene- Coating a paste in which 80 parts by mass of an inorganic filler and 10 parts by mass of a thermally expandable microcapsule foaming agent are added to 100 parts by mass of a vinyl acetate copolymer resin so that the basis weight is 50 g / m ² or more and 220 g / m ² or less. As a surface protective layer, acrylic resin is applied by a lip coater method so that the basis weight is 5 g / m ² or more and 40 g / m ² or less, and the foaming furnace outlet paper surface temperature is 150 ° C. and the embossing heater outlet paper surface temperature is 180 ° C. At the same time, after passing through the embossing heater, immediately after passing through the embossing roll, press the embossing roll to give the embossed pattern. After cooling and drying.

  According to one embodiment of the present invention, it is possible to produce a single-layer plastic-based foam wallpaper having high strength, stain resistance, and non-land concealment.

It is typical sectional drawing which shows an example of the cross-sectional shape of the foam wallpaper based on one Embodiment of this invention.

<Embodiment>
Below, with reference to drawings, the manufacturing method of the foam wallpaper based on one Embodiment of this invention is demonstrated. Here, the drawings are schematic, and the relationship between the thickness and the planar dimensions, the ratio of the thickness of each layer, and the like are different from the actual ones. Further, the embodiment described below exemplifies a configuration for embodying the technical idea of the present invention, and the technical idea of the present invention is that the material, shape, structure, etc. of the component parts are as follows. It is not something specific. The technical idea of the present invention can be variously modified within the technical scope defined by the claims described in the claims.

(Foam wallpaper)
In FIG. 1, an example of the shape of the cross section of the foam wallpaper 10 which concerns on one Embodiment of this invention is shown.
In the foam wallpaper 10 according to the present embodiment, a foam resin layer 2, a pattern pattern layer 3 provided as appropriate, and a surface protective layer 4 are laminated in this order on a paper base material 1 serving as a base material. Furthermore, the embossed pattern 5 is formed on the surface of the foam wallpaper 10 according to the present embodiment.

[Paper base]
The paper substrate 1 is a so-called wallpaper backing paper (fibrous sheet). Examples of the paper base 1 include general paper for wallpaper (pulp-based sheets sized with a known sizing agent); flame-retardant paper (pulp-based sheets such as guanidine sulfamate and guanidine phosphate) Inorganic paper containing inorganic additives such as aluminum hydroxide and magnesium hydroxide; fine paper; thin paper; fiber mixed paper (paper made by mixing pulp and synthetic fiber) .

In the present embodiment, plain paper is applicable as the paper base material 1, and the basis weight is 50 g / m ² or more and 100 g / m ² or less and the thickness is in the range of 80 μm or more and 150 μm or less. The required rigidity is ensured.

[Foamed resin layer]
The foamed resin layer 2 is formed by applying a resin containing a foaming agent to the surface of the paper substrate 1. In the present embodiment, a foaming agent, a plasticizer, a stabilizer, a thinning agent, other organic additives, and an inorganic powder (inorganic filler) as a filler are appropriately mixed with the resin according to the intended use. The foamed resin layer 2 is provided by coating the surface of the substrate 1 in the form of a sheet or a pattern.
Examples of the resin coating method include a knife coating method, a nozzle coating method, a die coating method, a lip coating method, a comma coating method, a gravure coating method, a rotary screen coating method, and a reverse roll coating method. .

  As the resin contained in the foamed resin layer 2, a resin that can be used in the form of an aqueous emulsion, for example, a polyolefin-based resin can be used. In particular, at least an ethylene copolymer having ethylene and a component other than ethylene as a monomer is used. One type is more preferable. Furthermore, an ethylene-vinyl acetate copolymer (EVA) resin can be suitably used.

  The ethylene copolymer is suitable for extrusion film formation from the viewpoint of the melting point and MFR. Examples of the ethylene copolymer include ethylene-vinyl acetate copolymer (EVA), ethylene-methyl methacrylate copolymer (EMMA), ethylene-ethyl acrylate copolymer (EEA), ethylene-methyl acrylate copolymer ( EMA), ethylene-methacrylic acid copolymer (EMAA), ethylene-α olefin copolymer, and the like. These ethylene copolymers can be used alone or in admixture of two or more. Among these ethylene copolymers, at least one of ethylene-vinyl acetate copolymer, ethylene-methyl methacrylate copolymer and ethylene-methacrylic acid copolymer is preferable, and when these are used in combination with other resins. The content of at least one of ethylene-vinyl acetate copolymer, ethylene-methyl methacrylate copolymer and ethylene-methacrylic acid copolymer is preferably 70% by mass or more, and more preferably 80% by mass or more.

  Moreover, as content of monomers other than ethylene contained in an ethylene copolymer, 5 to 25 mass% is preferable, for example, and 9 to 20 mass% is more preferable. By adopting such a copolymerization ratio, the extrusion film forming property is further enhanced. As a specific example, the ethylene-vinyl acetate copolymer has a vinyl acetate copolymerization ratio (VA amount) of preferably 9% by mass to 25% by mass, and more preferably 9% by mass to 20% by mass. The ethylene-methyl methacrylate copolymer has a methyl methacrylate copolymerization ratio (MMA amount) of preferably 5% by mass to 25% by mass, and more preferably 5% by mass to 15% by mass. The ethylene-methacrylic acid copolymer has an acrylic acid copolymerization ratio (MAA amount) of preferably 2% by mass or more and 15% by mass or less, and more preferably 5% by mass or more and 11% by mass or less.

  Here, the resin contained in the foamed resin layer 2 is, for example, an MFR (melt flow rate) measured at 190 ° C. and a load of 21.18 N described in JIS K 6922 of 10 g or more and 10 g or less (10 g) per 10 minutes. / 10 minutes or more and 100 g / 10 minutes or less). When the MFR is within the above range, since the temperature rise when forming the foamed resin layer 2 by extrusion film formation is small and the film can be formed in a non-foamed state, when the pattern layer 3 is formed later, smoothness is required. It can be printed on any surface and there are few patterns missing. If the MFR is too large, the resin is too soft, so that the formed foamed resin layer 2 may have insufficient scratch resistance.

In addition, as the foaming agent contained in the foamed resin layer 2, it is possible to use a foaming agent that is commonly used for foamed wallpaper, and in particular, a thermally expandable microcapsule foaming agent has performance (foaming ratio, From the viewpoint of (strength). In addition, azo, hydrazide, nitroso, etc. can be used.
The amount of the foaming agent added depends on the thickness of the foamed resin layer 2 and the foaming ratio (volume expansion coefficient before and after foaming), for example, 1 to 20 parts by mass with respect to 100 parts by mass of the resin, Preferably it is about 5 to 15 parts by mass.
Incidentally, the expansion ratio and basis weight of the foamed resin layer 2, by the basis weight of 50 g / m ² or more 220 g / m ² or less and more than three times expansion ratio, sufficient voluminous to obtain uneven surface hiding property In addition to having excellent surface strength, the uneven shape of the embossed pattern 5 described later can also be reproduced sharply.

Examples of the inorganic powder contained in the foamed resin layer 2 include calcium carbonate, aluminum hydroxide, magnesium hydroxide, silica sand, talc, silicas, magnesium silicate, zinc borate, and titanium dioxide. Inorganic powder shall add the amount of 50 to 150 mass parts with respect to 100 mass parts of resin.
Thus, the foamed resin layer 2 according to the present embodiment is formed of a resin composition containing an aqueous emulsion resin, a foaming agent, and an inorganic filler.

[Pattern pattern layer 3]
The pattern layer 3 imparts design properties to the foamed wallpaper 10. The pattern pattern layer 3 can be formed, for example, by printing a pattern pattern on the surface of the foamed resin layer 2. Alternatively, it can be formed by coating the foamed resin layer 2 in a pattern pattern. The thickness of the design pattern layer 3 is different from the type of design pattern, but it is generally preferable that the thickness is about 0.1 μm or more and 10 μm or less.

  Examples of the design pattern include a wood grain pattern, a stone pattern, a grain pattern, a tiled pattern, a brickwork pattern, a cloth pattern, a leather pattern, a geometric figure, a character, a symbol, and an abstract pattern. The pattern can be selected according to the purpose.

  Examples of the pattern pattern printing technique include gravure printing, flexographic printing, silk screen printing, and offset printing. As the printing ink, for example, a printing ink containing a colorant, a binder resin, and a solvent can be used. These inks may be known or commercially available.

As the colorant, for example, a pigment can be appropriately used. The pigment includes an inorganic pigment and an organic pigment. Inorganic pigments include, for example, titanium oxide, zinc white, carbon black, black iron oxide, yellow iron oxide, yellow lead, molybdate orange, cadmium yellow, nickel titanium yellow, chrome titanium yellow, iron oxide (valve), and cadmium. Examples thereof include red, ultramarine blue, bitumen, cobalt blue, chromium oxide, cobalt green, aluminum powder, bronze powder, titanium mica, and zinc sulfide. Examples of the organic pigment include aniline black, perylene black, azo (azo lake, insoluble azo, condensed azo), polycyclic (isoindolinone, isoindoline, quinophthalone, perinone, flavantron, anthrapyrimidine, anthraquinone, Quinacridone, perylene, diketopyrrolopyrrole, dibromoanthanthrone, dioxazine, thioindigo, phthalocyanine, indanthrone, halogenated phthalocyanine). The content of the colorant is preferably about 10 to 50 parts by mass, more preferably about 15 to 30 parts by mass with respect to 100 parts by mass of the resin.
Further, when the foamed resin layer 2 serves as a solid layer with respect to the pattern layer 3, or when the foamed resin layer 2 is applied in a pattern shape, the foamed resin layer 2 may also contain a colorant. good.

  The binder resin can be set according to the type of the lower layer resin that forms the pattern layer 3. Examples of the binder resin include acrylic resin, styrene resin, polyester resin, urethane resin, chlorinated polyolefin resin, vinyl chloride-vinyl acetate copolymer resin, polyvinyl butyral resin, alkyd resin, petroleum Resin, ketone resin, epoxy resin, melamine resin, fluorine resin, silicone resin, fiber derivative, rubber resin and the like.

  Examples of the solvent (or dispersion medium) include petroleum organic solvents such as hexane, heptane, octane, toluene, xylene, ethylbenzene, cyclohexane, and methylcyclohexane; ethyl acetate, butyl acetate, 2-methoxyethyl acetate, and acetic acid-2 -Ester-based organic solvents such as ethoxyethyl; alcohol-based organic solvents such as methyl alcohol, ethyl alcohol, normal propyl alcohol, isopropyl alcohol, isobutyl alcohol, ethylene glycol, propylene glycol; ketones such as acetone, methyl ethyl ketone, methyl isobutyl ketone, and cyclohexanone Organic solvents; ether organic solvents such as diethyl ether, dioxane, tetrahydrofuran; dichloromethane, carbon tetrachloride, trichloroethylene, tetrachloroethylene Chlorinated organic solvents; water and the like. These solvents (or dispersion media) can be used alone or in the form of a mixture.

  In the present embodiment, the pattern layer 3 is made of a printing ink (non-foamable ink) and / or a foamable ink whose main component is an aqueous emulsion resin, a foamable ink whose main component is a vinyl chloride paste resin, or the like. And a gravure printing method, a screen printing method, a flexographic printing method and the like.

When the pattern layer 3 is not formed on the foamed resin layer 2, an undercoat layer (primer layer) may be formed as an alternative to the pattern layer 3. The undercoat layer includes a polyolefin resin, an acrylic resin, a polyvinyl alcohol resin, and the like, and the basis weight after drying is desirably 1 g / m ² or more and 3 g / m ² or less.

[Surface protective layer]
The surface protective layer 4 is formed on the surface of the design pattern layer 3 with the intention of adjusting the gloss and / or protecting the design pattern layer 3. The thickness of the surface protective layer 4 is not limited, but is preferably about 0.1 μm to 15 μm. Here, the kind of the surface protective layer 4 is not limited. If it is the surface protective layer 4 aiming at gloss adjustment, there exists the surface protective layer 4 containing known fillers, such as a silica, for example. As a method for forming the surface protective layer 4, for example, a known method such as gravure printing can be employed. In addition, when the adhesiveness of the pattern pattern layer 3 and the surface protection layer 4 is not fully acquired, the surface protection layer 4 can also be provided after carrying out the adhesion process (primer process) of the surface of the pattern pattern layer 3 easily. . When the surface protective layer 4 is formed for the purpose of surface strength (scratch resistance, etc.), stain resistance, protection of the pattern layer 3 and the like of the foam wallpaper 10, a resin containing an ionizing radiation curable resin as a resin. Is preferred. As the ionizing radiation curable resin, for example, those that undergo radical polymerization (curing) by electron beam irradiation are preferable.

  In this embodiment, the surface protective layer 4 is formed on the pattern layer 3, and a layer mainly composed of an aqueous emulsion resin is formed by a gravure printing method, a knife coating method, a nozzle coating method, a die coating method, a lip coating. It is formed by a coating method, a comma coating method or the like.

Examples of the resin contained in the surface protective layer 4 include polyolefin resins, acrylic resins, polyvinyl alcohol resins, fluorine resins, and the like, and acrylic resins are particularly preferable. These resins may be used alone or in combination of two or more. Moreover, when using resin which can be bridge | crosslinked for formation of the surface protective layer 4, you may perform a crosslinking process to the said resin as needed. The basis weight after drying of the surface protective layer 4 is preferably 5 g / m ² or more and 40 g / m ² or less, preferably 15 g / m ² or more and 30 g / m ² or less.

Further, a filler is added to the resin contained in the surface protective layer 4 as a matting agent (gloss adjusting agent). As the matting agent, for example, silica particles, alumina (α-alumina, etc.), inorganic particles such as calcium carbonate, barium sulfate, kaolinite, aluminosilicate, or organic particles such as polycarbonate, nylon, urethane resin are used. be able to.
Thus, the surface protective layer 4 according to the present embodiment contains an acrylic resin and a filler.

[Embossed pattern]
The surface of the surface protective layer 4, which is the outermost layer of the foam wallpaper 10, is embossed (unevenness embossing using an embossed plate), and the embossed pattern 5 is shaped (given). In embossing, for example, the foam wallpaper 10 is passed between an emboss roll having a recess having a depth of 15 μm or more and a rubber back roll having a hardness of 50 degrees or more and less than 90 degrees to form an uneven shape on the foam wallpaper 10. You may make it give. As a method for measuring hardness, for example, JIS K-6301 A type can be used. Examples of the embossed pattern include a wood grain plate conduit groove, a stone plate surface unevenness, a cloth surface texture, a satin texture, a grain texture, a hairline, and a multiline groove.

  In addition, as a method of forming an uneven shape on the surface of the surface protective layer 4, there are other methods such as a method of partially foaming with a foam suppression ink and a chemical embossing method of partially heating and foaming with hot air or infrared rays. In particular, mechanical embossing by pressure contact with an embossing roll is preferable because sharp unevenness can be obtained with respect to the foamed resin layer 2. Moreover, it is desirable to maintain the surface temperature of the foamed wallpaper 10 immediately before the contact of the embossed plate in the embossing process between 160 ° C. and 190 ° C., preferably between 170 ° C. and 180 ° C.

As described above, the foamed wallpaper 10 according to the present embodiment includes the foamed resin layer 2 made of the resin composition containing the aqueous emulsion resin, the foaming agent, and the inorganic filler on the paper substrate 1, and the acrylic resin. And a surface protective layer 4 containing a filler are laminated.
In the foam wallpaper 10 according to the present embodiment, the foam resin layer 2 has a single composition (single layer), and the coating amount of the foam resin layer 2 is limited, thereby preventing ink cracks in the pattern layer 3.

Moreover, from the viewpoint of imparting fireproof performance, the total basis weight of the foamed wallpaper 10 according to the present embodiment is desirably 170 g / m ² or less. That is, the total basis weight of the paper substrate 1, the foamed resin layer 2, and the surface protective layer 4 is preferably 170 g / m ² or less. Regarding the basis weight of each layer in that case, for example, the basis weight of the paper substrate 1 is 65 g / m ² or less, the basis weight of the foamed resin layer 2 is 85 g / m ² or less, and the basis weight of the surface protective layer 4 is 20 g / m ^2. m is preferably ² or less.

  Examples of the present embodiment and comparative examples are shown below. In addition, this embodiment is not limited to the following Example.

[Example 1]
Plain paper (Nippon Paper Industries Co., Ltd .: “WK685AP”) having a basis weight of 85 g / m ² and a thickness of 130 μm is used as the paper substrate 1, and EVA resin (manufactured by Sumika Chemtex: “S-7400 (HQ) is used as the foamed resin layer 2”. ) ") 80 parts by mass of inorganic powder (inorganic filler) for imparting fireproof performance to 100 parts by mass, thermally expandable microcapsule foaming agent (Matsumoto Yushi Seiyaku:“ FT- 16 ") After applying 10 parts by mass of paste by a coating method so that the total basis weight is 185 g / m ² , acrylic resin (DIC: ATC-354)) is added as the surface protective layer 4 was applied by a lip coater method so that the basis weight of 205g / m ^2, subjected to a heat foaming in ° C. foaming furnace outlet paper temperature 150 and embossing heater outlet paper temperature 180 ° C., at the same time ene Scan heater after passing immediately pressed with a embossing roll performs the application of the embossed pattern 5, then cooled and dried to create a foam wallpaper Example 1.

[Example 2]
Plain paper (Nippon Paper Industries Co., Ltd .: “WK685AP”) having a basis weight of 85 g / m ² and a thickness of 130 μm is used as the paper substrate 1, and EVA resin (manufactured by Sumika Chemtex: “S-7400 (HQ) is used as the foamed resin layer 2”. ) ") After applying paste by adding 80 parts by mass of inorganic powder (inorganic filler) to 100 parts by mass by a coating method so that the total basis weight is 185 g / m ² , water-based ink is used as the pattern layer 3. Using the pattern printing by gravure printing, an acrylic resin (DIC: “ATC-354”) is applied as the surface protective layer 4 by a lip coater method so that the total basis weight is 205 g / m ^2. Then, foaming is carried out at a foaming furnace outlet paper surface temperature of 150 ° C and an embossing heater outlet paper surface temperature of 180 ° C. Perform the application of the embossed pattern 5, then cooled and dried to create a foam wallpaper of Example 2.

[Comparative Example 1]
After applying an acrylic resin as the surface protective layer 4, foaming was performed by heating at a foaming furnace outlet paper surface temperature of 150 ° C. and an embossing heater outlet paper surface temperature of 180 ° C., followed by cooling and drying to prepare a foamed wallpaper of Example 1. That is, the embossed pattern 5 was not applied. Otherwise, the foamed wallpaper of Comparative Example 1 was prepared in the same manner as in Example 1.

[Comparative Example 2]
No acrylic resin was applied as the surface protective layer 4 (the surface protective layer 4 was removed), and the embossed heater outlet paper surface temperature was 160 ° C. Otherwise, the foamed wallpaper of Comparative Example 2 was prepared in the same manner as in Example 2.

[Comparative Example 3]
Plain paper (Nippon Paper Industries Co., Ltd .: “WK685AP”) having a basis weight of 85 g / m ² and a thickness of 130 μm is used as the paper substrate 1, and EVA resin (manufactured by Sumika Chemtex: “S-7400 (HQ) is used as the foamed resin layer 2”. ) ") After applying a paste obtained by adding 80 parts by mass of inorganic powder (inorganic filler) to 100 parts by mass by a coating method so as to have a total basis weight of 185 g / m ² , an acrylic resin (as surface protective layer 4) DIC Co., Ltd .: “ATC-354”) was applied by a lip coater method so that the total basis weight was 205 g / m ^2, and foamed by heating at a foaming furnace outlet paper surface temperature of 150 ° C. and an embossed heater outlet paper surface temperature of 180 ° C. The foamed wallpaper of Comparative Example 3 was prepared by cooling and drying.

[Evaluation method]
(Non-landscape concealment)
In order to evaluate the non-land concealment, a circular seal with a thickness of 110 μm and a diameter of 20 mm is pasted on a semi-incombustible standard gypsum board (thickness 9.5 mm), and light is applied from the side to visually observe a land that is not land ( It was evaluated whether or not a place that was not horizontal) could be identified.
○ (Pass): Cannot identify the land on the land × (Fail): Can identify the land on the land

(Surface strength)
In order to evaluate the surface strength, whether the base paper layer (paper substrate 1) is exposed by visually judging whether the surface is damaged or not by a test based on the “Surface Strengthening Wallpaper Performance Rules” established by the Wallpaper Industry Association. Evaluated whether or not.
○ (Pass): Base paper layer is not exposed × (Fail): Base paper layer is exposed

(Contamination resistance)
In order to evaluate the stain resistance, the possibility of wiping off contaminants adhering to the surface was evaluated by a test in accordance with the standard “Smudge Prevention Wallpaper Performance Rules” established by the Wallpaper Industry Association.
○ (Pass): Can wipe off contaminants attached to the surface. × (Fail): Cannot wipe contaminants attached to the surface.

[Evaluation results]
The evaluation results are shown in Table 1 below.

Since Example 1 and Example 2 passed in all the items of non-land concealment property, surface strength, and contamination resistance, the overall evaluation was determined to be acceptable.
Since the comparative example 1 was rejected about the non-land concealment property, it passed the surface strength and the contamination resistance, but the overall evaluation was rejected.
Although the comparative example 2 passed about the non-land concealment property, since it failed about surface strength and stain resistance, comprehensive evaluation was made unsuccessful.
Since the comparative example 3 failed in all the items of non-land concealment property, surface strength, and contamination resistance, the comprehensive evaluation was rejected.

If the foamed wallpaper of Example 1 and Example 2 was created, it was confirmed that the requirements were satisfied in all of the non-land coverability, surface strength, and contamination resistance regardless of the presence or absence of the pattern layer 3.
By comparing Example 1 with Comparative Example 1, it was confirmed that the embossed pattern 5 could be specified unless the embossed pattern 5 was applied.
By comparing Example 2 and Comparative Example 2, it was confirmed that if the surface protective layer 4 was not formed, the base paper layer was exposed and the contaminants adhered to the surface could not be wiped off.

  The foam wallpaper according to the present embodiment can be used for wall decorations of buildings such as detached houses, apartment houses, stores, office buildings and the like.

  While the present invention has been described with reference to specific embodiments, it is not intended that the invention be limited by these descriptions. From the description of the invention, other embodiments of the invention will be apparent to persons skilled in the art, along with various variations of the disclosed embodiments. Therefore, it is to be understood that the claims encompass these modifications and embodiments that fall within the scope and spirit of the present invention.

DESCRIPTION OF SYMBOLS 1 ... Paper base material 2 ... Foamed resin layer 3 ... Pattern pattern layer 4 ... Surface protection layer 5 ... Embossed pattern 10 ... Foam wallpaper

Claims (6)

A paper substrate;
A foamed resin layer containing an aqueous emulsion resin, a foaming agent, and an inorganic filler;
A surface protective layer containing an acrylic resin and a filler;
Foam wallpaper characterized by being laminated. The paper substrate has a basis weight of 50 g / m ^{2 to} 100 g / m ² and a thickness of 80 μm to 150 μm,
The foamed resin layer has a basis weight of 50 g / m ² or more and 220 g / m ² or less and an expansion ratio of 3 times or more,
The foamed wallpaper according to claim 1, wherein the surface protective layer has a basis weight of 5 g / m ² or more and 40 g / m ² or less. The foamed wallpaper according to claim 1 or 2, wherein a total basis weight of the paper base material, the foamed resin layer, and the surface protective layer is 170 g / m ² or less.   The foaming wallpaper according to any one of claims 1 to 3, wherein the foaming agent contained in the foamed resin layer is a thermally expandable microcapsule foaming agent. A plain paper having a basis weight of 50 g / m ² or more and 100 g / m ² or less and a thickness of 80 μm or more and 150 μm or less is used as a paper substrate.
As a foamed resin layer, a paste obtained by adding 80 parts by mass of an inorganic filler and 10 parts by mass of a thermally expandable microcapsule foaming agent to 100 parts by mass of an ethylene-vinyl acetate copolymer resin has a basis weight of 50 g / m ² or more and 220 g / m ^2. Apply by coating method to be as follows,
As a surface protective layer, an acrylic resin is applied by a lip coater method so that the basis weight is 5 g / m ² or more and 40 g / m ² or less,
Perform foaming at a foaming furnace outlet paper surface temperature of 150 ° C. and an embossing heater outlet paper surface temperature of 180 ° C.,
At the same time, immediately after passing through the embossing heater, press the embossing roll to give the embossed pattern,
A method for producing foamed wallpaper, which is then cooled and dried.   6. The method for producing foam wallpaper according to claim 5, wherein after the foamed resin layer is applied by a coating method, pattern printing is performed by gravure printing using water-based ink as a pattern pattern layer.

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