JP2018066089A - Foamed wallpaper - Google Patents

Abstract

A foamed wallpaper having stain resistance and high antibacterial and antifungal properties is provided. A foam wallpaper includes a paper substrate, 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 and an antifungal agent. Are stacked in this order. The average particle diameter of the antibacterial agent is 0.2 μm or more and 0.6 μm or less, and the antibacterial agent and the antifungal agent are 0.05 parts by mass or more and 1.0 parts by mass, respectively, with respect to 100 parts by mass of the resin of the surface protective layer 4. It is added in an amount of not more than 0.1 parts by mass and not more than 0.1 parts by mass. [Selection] Figure 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.

  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

By the way, in foaming wallpaper, it is desired to provide stain resistance, antibacterial properties and antifungal properties at the same time. Therefore, in conventional foamed wallpaper, antibacterial and antifungal agents are added to the foamed resin layer to provide antibacterial and antifungal properties, and a surface protective layer having stain resistance is provided on the foamed resin layer. In addition, it gave the stain resistance. However, since the foamed resin layer to which the antibacterial agent and the antifungal agent are added is located in the lower layer of the surface protective layer, the antibacterial performance and the antifungal performance are hardly obtained.
This invention is made | formed in view of said situation, and is providing the foaming wallpaper to which stain resistance and the high antibacterial property and antifungal property were provided.

  In order to solve the above problems, a foamed wallpaper according to one embodiment of the present invention includes a paper base, a foamed resin layer containing an aqueous emulsion resin, a foaming agent, and an inorganic filler, a resin, an antibacterial agent, and an antifungal agent. And a surface protective layer containing the above antibacterial agent, the average particle diameter of the antibacterial agent is 0.2 μm or more and 0.6 μm or less, and the antibacterial agent is added 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 embodiment of the present invention, it is possible to provide a foamed wallpaper having stain resistance and high antibacterial and antifungal properties.

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.

  Hereinafter, foamed wallpaper according to an embodiment of the present invention will be described with reference to the drawings. Here, the drawings are schematic, and the relationship between the thickness and the planar dimensions, the ratio of 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 foamed wallpaper 10 of the present embodiment, a foamed 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. The foamed resin layer 2, the pattern layer 3, and the surface protective layer 4 constitute a laminate on the paper substrate 1. And the surface protective layer 4 is provided in the uppermost layer of a laminated body, and is used as a final protective film.

<Paper base material>
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 this embodiment, plain paper can be used as the paper base 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 rigidity required as a material 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.
The basis weight and expansion ratio of the foamed resin layer 2 are set to a foaming ratio that is not less than 50 g / m ^{2 and not} more than 220 g / m ² , and 3 times or more. It has a feeling and excellent surface strength, and can also reproduce sharply 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, 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>
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.

In addition, 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.
[Antimicrobial 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 when the particle size is large, the particles are easily aggregated and the dispersibility is poor. The average particle size is more preferably 0.3 μm or more and 0.5 μm or less. This average particle diameter is an average particle diameter measured by a laser diffraction scattering method. The metal particles are preferably silver metal particles.
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. When the addition amount of the antibacterial agent is less than 0.05 parts by mass, the antibacterial effect cannot be sufficiently exhibited, and when the addition amount of the antibacterial agent is more than 1.0 part by mass, the expansion ratio is lowered.

[Anti-mold agent]
As the fungicide, for example, a water-dispersed organic nitrogen sulfur halogen compound is preferably used.
Further, the fungicide is added in an amount of 0.1 parts by mass or more and 1.0 part by mass or less, and 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 4. It is preferable that
Thus, the surface protective layer 4 in this 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 (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 preferable to maintain the surface temperature of the foam wallpaper 10 immediately before the contact of the embossed plate in the embossing process 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 includes a foamed resin layer 2 made of a resin plastic material containing a water-based emulsion resin, a foaming agent and an inorganic filler on the paper substrate 1, and a water-based emulsion resin. 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 foam wallpaper 10 according to the present embodiment, since the antibacterial agent and the antifungal agent are added to the surface protective layer 4 that is the uppermost layer, the antibacterial agent and the antifungal agent are added to the foamed resin layer. Compared to the above, stain resistance and high antibacterial and antifungal properties are imparted.

Moreover, from the viewpoint of imparting fireproof performance, the total basis weight of the foamed wallpaper 10 of 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
In Example 1, a paper substrate made of plain paper (Nippon Paper Industries Co., Ltd .: “WK685AP”) having a basis weight of 85 g / m ² and a thickness of 130 μm was used as the paper substrate 1 (backing paper for wallpaper).
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)”] A foamed resin layer having a foaming ratio of 3 was formed by coating on a paper substrate by a coating method so that the amount was 120 g / m ² .
Next, as the pattern layer 3, the acrylic resin ink was printed on the foamed resin layer by gravure printing so that the basis weight was 2 g / m ² to form a pattern layer.
Next, as the surface protective layer 4, a paste pattern obtained by adding 0.05 part by weight of an antibacterial agent and 0.1 part by weight of an antifungal agent to an acrylic resin is designed by a lip coater method so as to have a basis weight of 20 / m ^2. A surface protective layer was formed by coating on the layer.
Thus, a laminate was formed on the paper substrate. After that, a predetermined temperature was applied to thermally foam the foaming agent contained in the laminate, and at the same time, an embossing pattern was added by pressing with an embossing roll.
Finally, the foaming wallpaper of Example 1 was prepared by performing cooling treatment and drying treatment. As the antibacterial agent, silver metal particles (manufactured by Taisho Technos Co., Ltd.) having a particle size of 0.3 μm or more and 0.5 μm or less were used. Further, as the fungicide, a water-dispersed organic nitrogen sulfur halogen compound (manufactured by Taisho Technos Co., Ltd.) was used.

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)
A foamed 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)
A foamed 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 produced 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)
<Antimicrobial properties>
About the foamed wallpaper of Examples 1 and 2 and Comparative Examples 1 and 2, the antibacterial property was evaluated by a test based on the standard “Antibacterial Wallpaper Performance Rules” established by the Wallpaper Industry Association. As an evaluation standard, the value of viable cell count (CFU / cm ² ) lower than 0.63 was set as “◯”, and the value of 0.63 or higher was set as “X”. The evaluation results are shown in Table 1.

<Mold resistance>
For the foamed wallpaper of Examples 1 and 2 and Comparative Examples 1 and 2, mold resistance was evaluated by a test based on the standard “Antibacterial Wallpaper Performance Regulations” established by the Paper Industry Association. As evaluation criteria, “○” indicates that mold growth was not recognized under the naked eye and under a microscope, and “X” indicates that mold growth was observed. The evaluation results are shown in Table 1.

<Contamination resistance>
For the foamed wallpaper of Examples 1 and 2 and Comparative Examples 1 and 2, the stain resistance was evaluated by a test based on the standard “stain resistance performance rule” established by the Wallpaper Industry Association. As evaluation criteria, grade 4 or higher was rated as “◯”, and grade 3 or lower was rated as “x”. The evaluation results are shown in Table 1.

  As can be seen from Table 1, it was confirmed that the foamed wallpaper of Example 1 and Example 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 requirement was not satisfied in the antibacterial test and the mold resistance test. Thereby, in Example 1 and Example 2, unlike Comparative Example 2, it was confirmed that both stain resistance and high antibacterial and antifungal properties can be imparted.

Moreover, in Example 1, Example 2, Comparative Example 1 and Comparative Example 2, the addition amount of the antibacterial agent was 0.05 parts by mass, but the addition amount of the antibacterial agent was 0.05 parts by mass in another evaluation result. It was also confirmed that there was no antibacterial effect when the amount was small. And when the addition amount of the antibacterial agent was more than 1.0 part, it has also confirmed that the foaming ratio in the foamed resin layer 2 fell.
From the above, it was also confirmed that the addition amount of the antibacterial agent is preferably in the range of 0.05 part by mass or more and 1.0 part by mass or less.

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

  From the above, it was also confirmed that the addition amount of the fungicide is preferably in the range of 0.1 parts 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 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.
For example, in the above-described embodiments and examples, the foamed wallpaper provided with the pattern layer has been described. However, the present invention is not limited to this, and can be applied to a foamed wallpaper in which the pattern layer is omitted, and can also be applied to a foamed wallpaper having an undercoat layer instead of the pattern layer. Can do.

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 (4)

A paper substrate;
A foamed resin layer containing an aqueous emulsion resin, a foaming agent and an inorganic filler;
A surface protective layer containing a resin, an antibacterial agent and an antifungal 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,
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,
The foamed wallpaper, wherein the fungicide is 0.1 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.   The foamed wallpaper according to claim 1, wherein the anti-fungal agent 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 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 foaming wallpaper according to any one of claims 1 to 3, wherein the foaming agent is a thermally expandable microcapsule foaming agent.

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