JP6801360B2 - Foam wallpaper - Google Patents

Description

The present invention relates to foam wallpaper used for building interior materials such as floors, walls, and ceilings.

A foamed wallpaper is manufactured by cross-linking a foamed resin layer of a laminated sheet (so-called raw fabric for foamed wallpaper) in which at least a foamed resin layer is laminated on a paper base material (so-called backing paper for wallpaper) and then foaming. Can be done. As an example of such a foam wallpaper, Patent Document 1 discloses a foam wallpaper having a paper base material, a resin layer and a pattern pattern layer, and having improved adhesion and surface rubbing characteristics of the pattern pattern layer.

JP-A-2007-196590

By the way, in foam wallpaper, it is desired to simultaneously impart stain resistance, antibacterial property and antifungal property. Therefore, in the conventional foam wallpaper, antibacterial and antifungal properties are imparted by adding an antibacterial agent and an antifungal agent to the foamed resin layer, and a stain-resistant surface protective layer is provided on the foamed resin layer. Was given stain resistance. However, since the foamed resin layer to which the antibacterial agent and the antifungal agent are added is located under the surface protective layer, it is difficult to obtain the antibacterial performance and the antifungal performance.
The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a foam wallpaper to which stain resistance, high antibacterial property and antifungal property are imparted.

In order to solve the above problems, the foamed wallpaper according to one aspect of the present invention includes a paper base material, a foamed resin layer containing an aqueous emulsion resin, a foaming agent and an inorganic filler, and a resin, an antibacterial agent and an antifungal agent. The surface protective layer containing the above-mentioned antibacterial agent is laminated in this order, the average particle size of the antibacterial agent is 0.2 μm or more and 0.6 μm or less, and the antibacterial agent is applied to 100 parts by mass of the resin of the surface protective layer. The amount of the fungicide is 0.1 part by mass or more and 1.0 part by mass or less with respect to 100 parts by mass of the resin of the surface protective layer.

According to one aspect of the present invention, it is possible to provide a foam wallpaper to which stain resistance, high antibacterial property and antifungal property are imparted.

It is a schematic cross-sectional view which shows an example of the shape of the cross section of the foam wallpaper which concerns on one Embodiment of this invention.

The foam wallpaper according to the embodiment of the present invention will be described below with reference to the drawings. Here, the drawings are schematic, and the relationship between the thickness and the plane dimension, the ratio of the thickness of each layer, and the like are different from the actual ones. Further, the embodiments shown below exemplify a configuration for embodying the technical idea of the present invention, and the technical idea of the present invention describes the material, shape, structure, etc. of the constituent parts as follows. It is not specific to the thing. The technical idea of the present invention may be modified in various ways within the technical scope specified by the claims stated in the claims.

(Foam wallpaper)
FIG. 1 shows an example of the cross-sectional shape of the foam wallpaper 10 according to the embodiment of the present invention.
In the foam wallpaper 10 of the present embodiment, the foamed resin layer 2, the pattern layer 3 appropriately provided, and the surface protection layer 4 are laminated in this order on the paper base material 1 as the base material. Further, an embossed pattern 5 is formed on the surface of the foam wallpaper 10 according to the present embodiment. The foamed resin layer 2, the pattern layer 3 and the surface protection layer 4 form a laminate on the paper base material 1. The surface protective layer 4 is provided on the uppermost layer of the laminated body and is used as the final protective film.

<Paper base material>
The paper base material 1 is a so-called wallpaper backing paper (fiber sheet). Examples of the paper base material 1 include general paper for wallpaper (pulp-based sheet size-treated with a known sizing agent); flame-retardant paper (pulp-based sheet treated with a flame-retardant agent such as guanidine sulfamate and guadinin phosphate). Inorganic paper containing inorganic additives such as aluminum hydroxide and magnesium hydroxide; high-quality paper; thin paper; fiber-blended paper (made by mixing pulp and synthetic fiber) and the like. ..

In this embodiment, plain paper can be applied as the paper base material 1, and the wall covering is made by 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. The rigidity required for the material is secured.

<Foam resin layer>
The foamed resin layer 2 is formed by applying a resin containing a foaming agent to the surface of the paper base material 1. In the present embodiment, a foaming agent, a plasticizer, a stabilizer, a thickener and other organic additives, and an inorganic powder (inorganic filler) as a filler are appropriately mixed with the resin according to the intended use, and paper is mixed. The foamed resin layer 2 is provided by coating the surface of the base material 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, a reverse roll coating method, and the like. ..

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, and in particular, at least an ethylene copolymer having ethylene and a component other than ethylene as a monomer. One is more preferable. Furthermore, ethylene-vinyl acetate copolymer (EVA) resin can be preferably used.

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

The content of the monomer other than ethylene contained in the ethylene copolymer is, for example, preferably 5% by mass or more and 25% by mass or less, and more preferably 9% by mass or more and 20% by mass or less. By adopting such a copolymerization ratio, the extruded film-forming property is further enhanced. As a specific example, the ethylene-vinyl acetate copolymer preferably has a copolymerization ratio (VA amount) of vinyl acetate of 9% by mass or more and 25% by mass or less, and more preferably 9% by mass or more and 20% by mass or less. The ethylene-methylmethacrylate copolymer preferably has a copolymerization ratio (MMA amount) of 5% by mass or more and 25% by mass or less, and more preferably 5% by mass or more and 15% by mass or less. The ethylene-methacrylic acid copolymer preferably has an acrylic acid copolymerization ratio (MAA amount) of 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 has an MFR (melt flow rate) of 10 g or more and 100 g or less (10 g) per 10 minutes measured under the conditions of 190 ° C. and a load of 21.18 N described in JIS K 6922, for example. / 10 minutes or more and 100 g / 10 minutes or less) is preferable. When the MFR is within the above range, the temperature rise when the foamed resin layer 2 is formed by extrusion film formation is small, and the film can be formed in a non-foamed state. Therefore, when the pattern layer 3 is formed later, it is smooth. It is possible to print on various surfaces and there is little pattern omission. If the MFR is too large, the resin is too soft, and the scratch resistance of the foamed resin layer 2 to be formed may be insufficient.

Further, as the foaming agent contained in the foamed resin layer 2, it is possible to use a foaming agent usually used for a known foaming wallpaper, but in particular, the heat-expandable microcapsule foaming agent has a performance (expansion ratio, foaming ratio, It is preferable from the viewpoint of strength). In addition, azo type, hydrazide type, nitroso type and the like can be used.
The amount of the foaming agent added depends on the thickness of the foamed resin layer 2 and the expansion ratio (expansion rate of the volume before and after foaming), but for example, 1 part by mass or more and 20 parts by mass or less with respect to 100 parts by mass of the resin. It is preferably about 5 parts by mass or more and 15 parts by mass or less.
By setting the basis weight and foaming ratio of the foamed resin layer 2 to 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, a volume sufficient to obtain non-land concealment. It has a feeling and excellent surface strength, and can sharply reproduce the uneven shape of the embossed pattern 5 described later.

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, titanium dioxide and the like. The amount of the inorganic powder is 50 parts by mass or more and 150 parts by mass or less with respect to 100 parts by mass of the resin.
As described above, 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>
The pattern pattern layer 3 imparts design to the foam wallpaper 10. The pattern pattern layer 3 can be formed, for example, by printing a pattern on the surface of the foamed resin layer 2. Alternatively, it can also be formed by coating the foamed resin layer 2 in a pattern pattern. The thickness of the pattern layer 3 varies depending on the type of pattern, but is generally preferably about 0.1 μm or more and 10 μm or less.

Examples of the pattern include a wood grain pattern, a stone grain pattern, a sand grain pattern, a tiled pattern, a brickwork pattern, a cloth grain pattern, a squeezed 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 printing method 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. As these inks, known or commercially available inks may be used.

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

The binder resin can be set according to the type of resin in the lower layer forming 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, and petroleum. Examples thereof include based resins, ketone resins, epoxy resins, melamine resins, fluorine resins, silicone resins, fibrous derivatives, rubber resins and the like.

Examples of the solvent (or dispersion medium) include petroleum-based organic solvents such as hexane, heptane, octane, toluene, xylene, ethylbenzene, cyclohexane, and methylcyclohexane; ethyl acetate, butyl acetate, -2-methoxyethyl acetate, and -2 acetate. -Ethyl-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 and propylene glycol; ketones such as acetone, methyl ethyl ketone, methyl isobutyl ketone and cyclohexanone. Examples thereof include ether-based organic solvents such as diethyl ether, dioxane and tetrahydrofuran; chlorine-based organic solvents such as dichloromethane, carbon tetrachloride, trichloroethylene and tetrachloroethylene; 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 uses a printing ink (non-foamable ink) and / or a foamable ink containing a water-based emulsion resin as a main component, a foamable ink containing a vinyl chloride paste resin as a main component, and the like. , Gravure printing method, screen printing method, flexo printing method, etc.

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 contains a polyolefin resin, an acrylic resin, a polyvinyl alcohol resin, and the like, and the basis weight after drying is preferably 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 pattern layer 3 with the intention of adjusting gloss and / or protecting the pattern layer 3. The thickness of the surface protective layer 4 is not limited, but is preferably about 0.1 μm or more and 15 μm or less. Here, the type of the surface protective layer 4 is not limited. If the surface protective layer 4 is intended for gloss adjustment, for example, there is a surface protective layer 4 containing a known filler such as silica.
As a method for forming the surface protective layer 4, for example, a known method such as gravure printing can be adopted. If the adhesion between the pattern layer 3 and the surface protection layer 4 cannot be sufficiently obtained, the surface protection layer 4 may be provided after the surface of the pattern layer 3 is easily adhered (primer treated). .. 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, etc. of the foam wallpaper 10, those containing an ionizing radiation curable resin as a resin are used. Suitable. As the ionizing radiation curable resin, for example, one that is radically polymerized (cured) by electron beam irradiation is preferable.

In the present embodiment, the surface protective layer 4 is formed on the pattern layer 3, and a layer containing an aqueous emulsion resin as a main component is formed by a gravure printing method, a knife coating method, a nozzle coating method, a die coating method, and a lip. It is formed by a coating method, a comma coating method, etc.

Examples of the resin contained in the surface protective layer 4 include polyolefin-based resins, acrylic-based resins, polyvinyl alcohol-based resins, fluorine-based resins, and the like, and acrylic-based resins are particularly preferable. These resins may be used alone or in combination of two or more. When a crosslinkable resin is used to form the surface protective layer 4, the resin may be crosslinked, if necessary. The basis weight of the surface protective layer 4 after drying 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, inorganic particles such as silica particles, alumina (α-alumina, etc.), calcium carbonate, barium sulfate, kaolinite, and aluminosilicate, or organic particles such as polycarbonate, nylon, and urethane resin are used. be able to.

Further, an antibacterial agent and an antifungal agent are added to the resin contained in the surface protective layer 4 in order to impart antibacterial and antifungal properties.
[Antibacterial agent]
Examples of the antibacterial agent include metal particles having an average particle size of 0.2 μm or more and 0.6 μm or less. This is because if the particle size is large, the particles tend to aggregate and the dispersibility is poor. Further, the average particle size is more preferably 0.3 μm or more and 0.5 μm or less. This average particle size is the average particle size measured by the laser diffraction / scattering method. Further, as the metal particles, silver-based metal particles are preferable.
Further, the antibacterial agent is added in an amount of 0.05 parts by mass or more and 1.0 part by mass or less with respect to 100 parts by mass of the resin of the surface protective layer 4. If the amount of the antibacterial agent added is less than 0.05 parts by mass, the antibacterial effect cannot be sufficiently exhibited, and if the amount of the antibacterial agent added is more than 1.0 parts by mass, the foaming ratio decreases.

[Antifungal agent]
As the fungicide, for example, it is preferable to use an aqueous dispersion type organic nitrogen sulfur halogen compound.
Further, the fungicide is added in an amount of 0.1 part by mass or more and 1.0 part by mass or less with respect to 100 parts by mass of the resin of the surface protective layer 4, and 0.2 part by mass or more and 0.4 part by mass or less is added. It is preferable that it is.
As described above, the surface protective layer 4 in the present embodiment contains an acrylic resin and a filler, and further contains an antibacterial agent and an antifungal agent.

[Embossed pattern]
The surface of the surface protective layer 4, which is the outermost layer of the foam wallpaper 10, is embossed (concavo-convex embossing using an embossed plate), and the embossed pattern 5 is embossed (imposed). In the embossing process, for example, the foam wallpaper 10 is passed between an emboss roll having a recess of 15 μm or more in depth and a rubber back roll having a hardness of 50 degrees or more and less than 90 degrees, and the foam wallpaper 10 has an uneven shape. May be applied. 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 conduit groove, a stone plate surface unevenness, a cloth surface texture, a satin finish, a grain, a hairline, and a perforated groove.

In addition, as a method of forming an uneven shape on the surface of the surface protective layer 4, there are a method of partially foaming with a foaming suppressing ink and a chemical embossing method of partially heating and foaming with hot air or infrared rays. In particular, mechanical embossing by pressure welding with an embossing roll is preferable because sharp irregularities can be obtained with respect to the foamed resin layer 2. Further, it is preferable to maintain the surface temperature of the foamed wallpaper 10 immediately before the contact of the embossed plate in the embossing step at 160 ° C. or higher and 190 ° C. or lower, preferably 170 ° C. or higher and 180 ° C. or lower.

As described above, the foamed wallpaper 10 according to the present embodiment has a foamed resin layer 2 made of a resin plastic containing an aqueous emulsion resin, a foaming agent and an inorganic filler, and an aqueous emulsion resin on a paper base material 1. And a surface protective layer 4 containing a filler and further containing an antibacterial agent and an antifungal agent are laminated in this order. Therefore, in the foamed wallpaper 10 according to the present embodiment, since the antibacterial agent and the antifungal agent are added to the surface protective layer 4 which is the uppermost layer, the conventional case where the antibacterial agent and the antifungal agent are added to the foamed resin layer. Compared with, stain resistance, high antibacterial property and antifungal property are imparted.

Further, from the viewpoint of imparting fire protection performance, it is desirable that the total basis weight of the foam wallpaper 10 of the present embodiment is 170 g / m ² or less. That is, the total basis weight of the paper base material 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 base material 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 / m. It is preferably m ² or less.

Examples and comparative examples of this embodiment are shown below. The present embodiment is not limited to the following examples.
(Example 1)
In Example 1, as the paper base material 1 (wallpaper backing paper), a paper base material made of plain paper [Nippon Paper Industries, Ltd .: "WK685AP"] having a basis weight of 85 g / m ² and a thickness of 130 μm was used.
Next, as the foamed resin layer 2, a paste material obtained by adding 80 parts by mass of a filler (inorganic filler) and 10 parts by mass of a capsule foaming agent to EVA resin [manufactured by Sumika Chemtex: "S-7400 (HQ)"] is added. A foamed resin layer having a foaming ratio of 3 times was formed by coating on a paper substrate by a coating method so as to have an amount of 120 g / m ² .
Next, as the pattern pattern layer 3, a pattern was printed on the foamed resin layer by gravure printing so that the acrylic resin ink had a basis weight of 2 g / m ^2, and the pattern layer was formed.
Next, as the surface protective layer 4, a paste material obtained by adding 0.05 parts by mass of an antibacterial agent and 0.1 parts by mass of an antifungal agent to an acrylic resin is patterned by a lip coater method so as to have a basis weight of 20 / m ^2. It was applied onto the layer to form a surface protective layer.
In this way, a laminate was formed on the paper substrate. Then, after that, a predetermined temperature was applied to heat-foam the foaming agent contained in the laminate, and at the same time, the foaming agent was pressed by an embossing roll to add an embossed pattern.
Finally, a cooling treatment and a drying treatment were performed to prepare a foam wallpaper of Example 1. As the antibacterial agent, silver-based metal particles having a particle size of 0.3 μm or more and 0.5 μm or less (manufactured by Taisho Technos Co., Ltd.) were used. As the fungicide, an aqueous dispersion type organic nitrogen sulfur halogen compound (manufactured by Taisho Technos Co., Ltd.) was used.

Plain paper (Nippon Paper Co., Ltd .: "WK685AP") with a basis weight of 85 g / m ² and a thickness of 130 μm is used as the paper base material 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) to impart fireproof performance to 100 parts by mass, and a heat-expandable microcapsule foaming agent to obtain foam thickness (Matsumoto Yushi Seiyaku Seisakusho:“ FT- 16 ") After applying the paste to which 10 parts by mass has been added by a coating method so that the total basis weight is 185 g / m ² , acrylic resin (DIC Co., Ltd .:" ATC-354 ") is added as the surface protective layer 4. Apply by the lip coater method so that the basis weight is 205 g / m ² , heat foaming is performed at a foaming furnace outlet paper surface temperature of 150 ° C. and an embossed heater outlet paper surface temperature of 180 ° C., and at the same time, pressurize with an embossed roll immediately after passing through the embossed heater. The embossed pattern 5 was applied, and then cooled and dried to prepare the foamed wallpaper of Example 1.

(Example 2)
The foam wallpaper of Example 2 was produced in the same manner as in Example 1 except that the amount of the fungicide added was 0.3 parts by mass.

(Comparative Example 1)
The foam wallpaper of Comparative Example 1 was produced in the same manner as in Example 1 except that the amount of the fungicide added was 0.05 parts by mass.

(Comparative Example 2)
The foamed wallpaper of Comparative Example 2 was prepared in the same manner as in Example 1 except that the antibacterial agent and the fungicide were added to the foamed resin layer in the same amount as in Example 1.

(Evaluation)
<Antibacterial property>
The antibacterial properties of the foamed wallpapers of Examples 1 and 2 and Comparative Examples 1 and 2 were evaluated by a test based on the standard "antibacterial wallpaper performance regulation" established by the Wallpaper Industry Association. As the evaluation criteria, those having a viable cell count (CFU / cm ² ) value lower than 0.63 were evaluated as “◯”, and those having a viable cell count (CFU / cm ² ) of 0.63 or more were evaluated as “x”. The evaluation results are shown in Table 1.

<Mold resistance>
The foamed wallpaper of Examples 1 and 2 and Comparative Examples 1 and 2 was evaluated for mold resistance by a test based on the standard "antibacterial wallpaper performance regulation" established by the Paper Industry Association. As the evaluation criteria, those in which mold growth was not observed with the naked eye and under a microscope were evaluated as "○", and those in which mold growth was observed were evaluated as "x". The evaluation results are shown in Table 1.

<Stain resistance>
The pollution resistance of the foamed wallpapers of Examples 1 and 2 and Comparative Examples 1 and 2 was evaluated by a test based on the standard "Staining resistance performance regulation" established by the Wallpaper Industry Association. As the evaluation criteria, grades 4 and above were rated as "○", and grades 3 and below were designated as "x". The evaluation results are shown in Table 1.

As can be seen from Table 1, it was confirmed that the foamed wallpapers of Examples 1 and 2 satisfied the requirements in all of the antibacterial test, the mold resistance test and the stain resistance test. On the other hand, in Comparative Example 2, it was confirmed that the requirements were not satisfied in the antibacterial resistance test and the mold resistance test. As a result, it was confirmed that in Examples 1 and 2, unlike Comparative Example 2, both stain resistance, high antibacterial property and antifungal property can be imparted.

Further, in Example 1, Example 2, Comparative Example 1 and Comparative Example 2, the amount of the antibacterial agent added was 0.05 parts by mass, but another evaluation result shows that the amount of the antibacterial agent added was 0.05 parts by mass. It was also confirmed that the antibacterial effect was not obtained when the amount was small. It was also confirmed that when the amount of the antibacterial agent added was more than 1.0 part, the foaming ratio in the foamed resin layer 2 decreased.
From the above, it was also confirmed that the amount of the antibacterial agent added is preferably in the range of 0.05 parts by mass or more and 1.0 parts by mass or less.

Further, as in Comparative Example 1, if the amount of the fungicide added is 0.05 parts by mass, the requirement in the mold resistance test is not satisfied, so that the amount of the fungicide added is less than 0.05 parts by mass. It was also confirmed that there was no antifungal effect. Then, as another evaluation result, it was confirmed that when the amount of the fungicide added was more than 1.0 part by mass, the foaming ratio in the foamed resin layer decreased.

From the above, it was also confirmed that the amount of the fungicide added is preferably in the range of 0.1 part by mass or more and 1.0 part by mass or less.

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

Although the present invention has been described above with reference to specific embodiments, it is not intended to limit the invention by these explanations. By reference to the description of the present invention, other embodiments of the present invention will be apparent to those skilled in the art as well as various variations of the disclosed embodiments. Therefore, it should be understood that the scope of claims also covers these modifications or embodiments included in the scope and gist of the present invention.
For example, in the above-described embodiments and examples, the foam wallpaper provided with the pattern layer has been described. However, the present invention is not limited to this, and can be applied to a foam wallpaper in which the pattern pattern layer is omitted, and also to a foam wallpaper having an undercoat layer instead of the pattern pattern layer. Can be done.

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

Claims (4)

Paper substrate and
A foamed resin layer containing an aqueous emulsion resin, a foaming agent and an inorganic filler, and
A surface protective layer containing a resin, an antibacterial agent composed of metal particles , and a fungicide composed of an organic nitrogen-sulfur-halogen compound is laminated in this order.
The average particle size of the antibacterial agent is 0.2 μm or more and 0.6 μm or less.
The amount of the antibacterial agent is 0.05 parts by mass or more and 1.0 part by mass or less with respect to 100 parts by mass of the resin of the surface protective layer.
A foamed wallpaper characterized in that the amount of the fungicide is 0.1 part by mass or more and 1.0 part by mass or less with respect to 100 parts by mass of the resin of the surface protective layer. The foamed wallpaper according to claim 1, wherein the amount of the fungicide is 0.2 parts by mass or more and 0.4 parts by mass or less with respect to 100 parts by mass of the resin of the surface protective layer. The paper substrate has 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.
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 foamed wallpaper according to claim 1 or 2, wherein the surface protective layer has a basis weight of 5 g / m ² or more and 40 g / m ² or less. The foaming wallpaper according to any one of claims 1 to 3, wherein the foaming agent is a heat-expandable microcapsule foaming agent.

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