JP2009235604A - Foamed wall paper having mildewproofing property - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a foamed wall paper having mildewproofing property, and also having excellent designability and foamability. <P>SOLUTION: The foamed wall paper having the mildewproofing property has a foamed resin layer formed on a paper base material by foaming a foaming agent-containing resin layer containing a foaming auxiliary. (1) The foaming auxiliary is a zinc compound, and (2) the foaming agent-containing resin layer contains zinc pyrithione besides them. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a foam wallpaper having antifungal properties.

  Foamed wallpaper is used for the wall interior of buildings.

  A foamed wallpaper is obtained by laminating a foamed resin layer on a paper-based substrate. The foamed resin layer is obtained by melting and kneading a resin composition containing a foaming agent, etc., and forming the foaming agent-containing resin layer using the kneaded product, and then thermally decomposing the foaming agent in the foaming agent-containing resin layer. Thus, the foaming agent-containing resin layer can be formed by foaming.

  When the foaming agent is thermally decomposed, if the heating temperature is excessively high, the paper-based substrate may be burned or the contained resin may be melted. Therefore, foaming at a relatively low heating temperature is required.

  Therefore, in recent years, foaming aids are used for the purpose of lowering the decomposition temperature of the foaming agent. As a foaming aid, a zinc compound is generally used.

  By the way, foamed wallpaper is required to have antifungal properties in order to prevent discoloration and alteration.

  As a foam wallpaper having antifungal properties, Patent Document 1 includes 2-n-octyl-4-isothiazolin-3-one and 2- (4-thiazolyl) -benzimidazole or methyl 2-benzimidazole carbamate. A foamed wallpaper using an antifungal composition for wallpaper containing a foaming agent characterized by the above has been reported.

  Patent Document 2 discloses an antibacterial and antifungal agent composed of a benzimidazole compound, a phosphorus-based antioxidant, and an antifungal resin composition containing a resin.

  However, when only a benzimidazole compound is used as an antifungal agent, sufficient antifungal properties cannot be imparted to the foamed wallpaper. In addition, the benzimidazole compound changes to yellow or tan due to heat when kneading the resin composition or foaming the foaming agent-containing resin layer, and the color appears on the foam wallpaper (design properties of the foam wallpaper). Is reduced). In addition, when a fungicide other than benzimidazole is used, a pinkish foam wallpaper may be obtained. This is considered to be caused by a reaction between the zinc compound (foaming aid) contained in the foaming agent-containing resin layer and the antifungal agent. In addition, there is a problem that the zinc compound is deactivated by the reaction and does not sufficiently function as a foaming aid.

Then, development of the foam wallpaper which has mold prevention property and was excellent in the designability and foamability is earnestly desired.
JP 2003-192508 A JP 2004-18538 A

  The main object of the present invention is to provide a foam wallpaper having antifungal properties and excellent design and foamability.

  As a result of intensive studies, the present inventor has found that the above object can be achieved by using a specific compound as an antifungal agent, and has completed the present invention.

That is, the present invention relates to the following foamed wallpaper.
1. A foam wallpaper having antifungal properties,
The foamed wallpaper has a foamed resin layer formed by foaming a foaming agent-containing resin layer containing a foaming aid on a paper-based substrate,
1) The foaming aid is a zinc compound,
2) The foaming agent-containing resin layer further contains zinc pyrithione.
Foam wallpaper.
2. Item 2. The foamed wallpaper according to item 1, wherein the content of the zinc pyrithione in the foaming agent-containing resin layer is 0.05 to 10 parts by weight with respect to 100 parts by weight of the resin component in the foaming agent-containing resin layer.
3. The foaming according to the above item 1 or 2, wherein the foaming agent-containing resin layer further contains a benzimidazole compound and contains 50 parts by weight or more of the zinc pyrithione with respect to the total amount of the zinc pyrithione and the benzimidazole compound. wallpaper.
4). Item 4. The foamed wallpaper according to any one of Items 1 to 3, wherein the foamed resin layer and the non-foamed resin layer A are sequentially formed on the paper base.
5. Item 5. The foamed wallpaper according to Item 4, wherein a non-foamed resin layer B is further formed between the paper-based substrate and the foamed resin layer.
6). Item 6. The foamed wallpaper according to Item 4 or 5, wherein a picture pattern layer and a surface protective layer are further formed in order on the non-foamed resin layer A.

The foam wallpaper of the present invention is a foam wallpaper having antifungal properties,
The foamed wallpaper has a foamed resin layer formed by foaming a foaming agent-containing resin layer containing a foaming aid on a paper-based substrate,
1) The foaming aid is a zinc compound,
2) The foaming agent-containing resin layer further contains zinc pyrithione.

The material of the paper base is not particularly limited as long as it has mechanical strength, heat resistance and the like suitable as a wallpaper base, and a fiber sheet can be generally used.

Specifically, among fiber sheets, flame retardant paper (pulp-based sheets treated with flame retardants such as guanidine sulfamate and guanidine phosphate); inorganic additives such as aluminum hydroxide and magnesium hydroxide Inorganic paper including; fine paper; thin paper and the like.

The basis weight of the paper-based substrate is not limited, but is preferably about 50 to 300 g / m ² and 50 to 8
About 0 g / m ² is more preferable.

Foaming agent-containing resin layer The foaming resin layer of the foamed wallpaper of the present invention is formed by foaming a foaming agent-containing resin layer containing a zinc compound as a foaming aid.

  Although the thickness of the said foaming agent containing resin layer is not limited, Usually, it is preferable to set it as about 70-150 micrometers.

<Resin component>
The resin component which comprises a foaming agent containing resin layer is not specifically limited, What is necessary is just to set suitably according to the foaming agent to be used, the kind of paper-type base material, etc. In particular, the foaming agent-containing resin layer is preferably a resin obtained from a combination of monomers that does not contain hydrogen bonds in the resin layer. Therefore, for example, an ethylene copolymer resin obtained from a combination of ethylene and a monomer having no OH group or COOH group can be suitably used. From this viewpoint, as the ethylene copolymer resin, for example, ethylene-vinyl acetate copolymer resin (hereinafter abbreviated as “EVA”), ethylene-methyl methacrylate copolymer resin (hereinafter abbreviated as “EMMA”), An ethylene-ethyl acrylate copolymer resin (hereinafter abbreviated as “EEA”), an ethylene methyl acrylate copolymer resin (hereinafter abbreviated as “EMA”), and the like can be used. Among these, EVA is particularly preferable.

<Foaming agent>
It does not specifically limit as a foaming agent, For example, well-known foaming agents, such as an inorganic type foaming agent and an organic type foaming agent, can be used.

  Examples of the inorganic foaming agent include sodium hydrogen carbonate, sodium carbonate, ammonium hydrogen carbonate, ammonium carbonate, ammonium nitrite and the like.

  Examples of the organic foaming agent include nitroso compounds, azo compounds, sulfonyl hydrazide compounds, azide compounds and the like. Examples of the nitroso compound include N, N′-dimethyl-N, N′-dinitrosoterephthalamide, N, N′-dinitrosopentamethylenetetramine and the like. Examples of the azo compound include azodicarbonamide, azobisisobutyronitrile, azocyclohexylnitrile, azodiamminobenzene, barium azodicarboxylate, and the like. Examples of the sulfonyl hydrazide compound include benzenesulfonyl hydrazide, toluenesulfonyl hydrazide, p, p'-oxybis (benzenesulfonyl hydrazide), diphenylsulfone-3,3'-disulfonyl hydrazide and the like. Examples of the azide compound include calcium azide, 4,4'-diphenyldisulfonyl azide, p-toluenesulfonyl azide and the like.

  These foaming agents can be used alone or in combination of two or more.

  In particular, azodicarbonamide is preferable as the foaming agent.

  The content of the foaming agent may be appropriately set according to the type of foaming agent, the expansion ratio, etc., but is preferably 3 to 6 parts by weight with respect to 100 parts by weight of the resin in the foaming agent-containing resin layer.

<Foaming aid>
The foaming agent-containing resin layer contains a zinc compound as a foaming aid. By containing a zinc compound, the decomposition temperature of the foaming agent can be suitably reduced.

Examples of the zinc compound include zinc oxide, fatty acid zinc salt (metal soap), and zinc chloride. Examples of the fatty acid zinc salt include zinc stearate.
These zinc compounds can be used singly or in combination of two or more. In particular, the zinc compound is preferably a fatty acid zinc salt, more preferably zinc stearate.

  What is necessary is just to set suitably content of the said zinc compound in the said foaming agent containing resin layer according to the kind of foaming agent, etc., but 0.3-10 weight with respect to 100 weight part of resin of a foaming agent containing resin layer. Part is preferable, and 1 to 5 parts by weight is more preferable.

<Anti-mold agent>
The foaming agent-containing resin layer further contains zinc pyrithione. By containing zinc pyrithione, a foamed wallpaper having excellent antifungal properties can be obtained. That is, the zinc pyrithione acts as a fungicide.
By using the zinc pyrithione as an antifungal agent, it is possible to suitably avoid the problem that the antifungal agent is changed to yellow or yellowish brown by heat like a benzimidazole compound. In addition, by containing the zinc pyrithione in the foaming agent-containing resin layer, the action of the foaming aid (the action of lowering the decomposition temperature of the foaming agent) can be promoted. Further, since zinc pyrithione basically does not react with the zinc compound, the problem that a pink foam wallpaper can be obtained and the problem that the zinc compound is deactivated can be preferably avoided.

  Content of the said zinc pyrithione in the said foaming agent containing resin layer is 0.05-10 weight part with respect to 100 weight part of resin components in a foaming agent containing resin layer, Preferably it is 0.1-4 weight part. In particular, when the content of zinc pyrithione is 0.1 to 4 parts by weight with respect to 100 parts by weight of the resin component in the foaming agent-containing resin layer, the anti-foaming performance is foamed without inhibiting the effect of the foaming aid. Can be reliably added to the wallpaper.

  The foaming agent-containing resin layer may further contain a benzimidazole compound within a range in which yellowing or tanning of the foamed wallpaper can be prevented or suppressed. Since the benzimidazole compound is highly safe, workability is improved by using the benzimidazole compound in combination as an antifungal agent.

As the benzimidazole compound, a compound generally used as an antifungal agent can be used. For example, 2-n-octyl-4-isothiazolin-3-one, 2- (4-thiazolyl) -benzimidazole, methyl 2-benzimidazole carbamate, methyl 1- (butylcarbamoyl) -2-benzimidazole carbamate, Examples include methyl 5-butyl 2-benzimidazolecarbamate. These can be used individually by 1 type or in combination of 2 or more types. In particular, 2- (4-thiazolyl) -benzimidazole is preferable as the benzimidazole compound.
When the benzimidazole compound is used in combination, the foaming agent-containing resin layer preferably contains 50 parts by weight or more of the zinc pyrithione with respect to the total amount of the zinc pyrithione and the benzimidazole compound, and includes 50 to 90 parts by weight. It is more preferable. When the content of the zinc pyrithione is less than 50 parts by weight, the amount of the benzimidazole compound is relatively large, so that the foamed wallpaper may be yellowed or yellowish brown.

<Other additives>
The foaming agent-containing resin layer may further contain known additives such as inorganic fillers, pigments, dispersants, flame retardants, and heat stabilizers.

  Among these, examples of the inorganic filler include calcium carbonate, aluminum hydroxide, magnesium hydroxide, antimony trioxide, zinc borate, and a molybdenum compound. By using an inorganic filler, an effect of suppressing see-through, an effect of improving surface characteristics, and the like are obtained.

  The content of the inorganic filler is preferably about 0 to 100 parts by weight and more preferably about 20 to 70 parts by weight with respect to 100 parts by weight of the resin constituting the resin layer.

  As the pigment, known pigments such as inorganic pigments and organic pigments can be used. Examples of inorganic pigments include 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 type (azo lake, insoluble azo, condensed azo), polycyclic (isoindolinone, isoindoline, quinophthalone, perinone, flavantron, anthrapyrimidine, anthraquinone, quinacridone, Perylene, diketopyrrolopyrrole, dibromoanthanthrone, dioxazine, thioindigo, phthalocyanine, indanthrone, halogenated phthalocyanine) and the like. Content of the pigment in a foaming agent containing resin layer is not specifically limited, What is necessary is just to set suitably from viewpoints, such as design property.

<Formation of foamed resin layer>
The foamed resin layer can be formed, for example, by forming the foaming agent-containing resin layer on the paper base and then heating and foaming the resin layer.

  The foaming agent-containing resin layer can be obtained, for example, by melting the resin component in the resin composition containing the resin component, the foaming agent, the zinc compound, zinc pyrithione, and the like and then molding the resin component.

  And the foaming agent in a foaming agent containing resin layer decomposes | disassembles by heating the laminated body in which the said foaming agent containing resin layer was formed on the said paper-like base material, and a foaming resin layer is formed.

  The heating conditions are not limited as long as the foamed resin layer is formed by the decomposition of the foaming agent. In particular, since the foaming agent-containing resin layer contains a zinc compound as a foaming aid, the foaming agent can be decomposed at a low heating temperature. Specifically, the heating temperature is preferably about 200 to 240 ° C. The heating time is preferably about 20 to 40 seconds.

  The expansion ratio of the foamed resin layer (the ratio as viewed from the foaming agent-containing resin layer) is not particularly limited, but is usually 4 times or more, preferably about 4 to 8 times. If the expansion ratio is too low, it is difficult to give an excellent appearance design. On the other hand, if the expansion ratio is too high, the foamed resin layer becomes mechanically weak, and the scratch resistance tends to decrease.

Specific Example of Foamed Wallpaper The layer structure of the foamed wallpaper of the present invention is not particularly limited as long as it is a structure in which a foamed resin layer is laminated on a paper-based substrate. It is preferable that the foamed resin layer and the non-foamed resin layer A are sequentially formed on the material. A non-foamed resin layer B may be further formed between the paper base and the foamed resin layer.
Hereinafter, the foamed wallpaper of the present invention will be described in detail by taking as an example a foamed wallpaper in which a non-foamed resin layer B, the foamed resin layer, and the non-foamed resin layer A are formed in this order on a paper substrate.

<Non-foamed resin layer A>
The resin constituting the non-foamed resin layer A is not particularly limited, and may be set as appropriate according to the performance of the intended foamed wallpaper. In particular, in the present invention, the non-foamed resin layer A preferably contains an ethylene-methacrylic acid copolymer resin (hereinafter abbreviated as “EMAA”). The content of EMAA is preferably 70 to 100% by weight.

  The thickness of the non-foamed resin layer A is not limited, but is preferably about 5 to 30 μm, and more preferably about 10 to 20 μm.

<Non-foamed resin layer B>
By forming the non-foamed resin layer B, the adhesion between the foaming agent-containing resin layer and the paper substrate is improved.

  The resin component which comprises the said non-foamed resin layer B is not specifically limited, What is necessary is just to select suitably according to the kind etc. of a paper-type base material. In particular, the non-foamed resin layer B is preferably a resin obtained from a combination of monomers such that the resin layer does not contain hydrogen bonds. Therefore, for example, an ethylene copolymer resin obtained from a combination of ethylene and a monomer having no OH group or COOH group can be suitably used. From this standpoint, EVA, EMMA, EEA, EMA, etc. can be used as the ethylene copolymer resin. Among these, EVA is particularly preferable.

  From the viewpoint of ease of bonding to a paper-based substrate, the melt flow rate value (hereinafter abbreviated as “MFR”) of the non-foamed resin layer B is preferably larger than the MFR of the foaming agent-containing resin layer. The MFR can be measured by a test method described in JISK 7210 (Thermoplastic flow test method). As test conditions, “190 ° C., 21.18 N (2.16 kgf)” described in JISK 6760 was adopted.

  The thickness of the non-foamed resin layer B is not limited, but is preferably about 5 to 20 μm, and more preferably about 10 to 15 μm.

<Lamination of each layer>
The method for forming each of the resin layers is not particularly limited, and examples thereof include multilayer coextrusion using a T-die extruder. For example, a multi-manifold type T die capable of simultaneously forming a plurality of layers by simultaneously extruding a plurality of types of molten resins can be suitably used.

  Specifically, in the case of forming a laminate by melting and extruding the foaming agent-containing resin layer and the non-foaming resin layer A, the composition for forming the non-foaming resin layer A and the foaming agent-containing resin layer are The composition to be formed may be put in a separate cylinder, and two types and two layers may be extruded simultaneously to form a film and laminate it.

  Further, when forming the non-foamed resin layer B, a composition for forming the non-foamed resin layer A, a composition for forming the foaming agent-containing resin layer, and a composition for forming the non-foamed resin layer B What is necessary is to put a thing in a respectively separate cylinder, and to extrude 3 types and 3 layers simultaneously, and to film-form and laminate | stack.

  The molten resin temperature at the time of co-extrusion is not particularly limited, and may be appropriately set according to the resin used, the foaming agent, and the like.

  When producing the foamed wallpaper of the present invention, it is preferable to further include a step of irradiating the non-foamed resin layer A and / or the foaming agent-containing resin layer with an electron beam before heating the foaming agent-containing resin layer. Thereby, since the resin contained in the non-foamed resin layer A and / or the foaming agent-containing resin layer can be crosslinked, the surface strength of the foamed wallpaper, the degree of foaming, and the like can be controlled. The energy of the electron beam is preferably about 150 to 250 kV. The irradiation amount is preferably about 1 to 7 Mrad. A known electron beam irradiation apparatus can be used as the electron beam source. Crosslinking can also be carried out using a chemical crosslinking agent (also referred to as a crosslinking agent or a crosslinking aid).

  Further, the surface of the non-foamed resin layer A may be subjected to corona discharge treatment. The corona discharge treatment can be performed according to a known method.

  In the foamed wallpaper of the present invention, a picture pattern layer and a surface protective layer may be further formed on the non-foamed resin layer A in this order. The pattern pattern layer and the surface protective layer will be described below.

<Pattern pattern layer>
The pattern layer is usually formed on the surface of the non-foamed resin layer A before the heat treatment of the foaming agent-containing resin layer.

  The pattern pattern layer can be formed, for example, by printing a pattern pattern on the surface of the non-foamed resin layer A. Examples of printing methods include gravure printing, flexographic printing, silk screen printing, and offset printing. As the printing ink, a known printing ink containing a colorant, a vehicle, and a solvent can be used.

  The thickness of the pattern layer is not limited, but is preferably about 0.1 to 15 μm.

<Surface protective layer>
By further providing the surface protective layer (overcoat layer), gloss adjustment and / or protection of the pattern layer can be achieved. In order to adjust the gloss, it is desirable to form a surface protective layer containing a known filler such as silica. If the surface protective layer is difficult to adhere, a primer layer may be interposed as necessary.

  As the surface protective layer, those containing an ionizing radiation curable resin as a resin component are also suitable. By curing a surface protective layer formed using an ionizing radiation curable resin by electron beam irradiation, it is easy to improve surface characteristics such as scratch resistance of foamed wallpaper. The energy of the electron beam is preferably about 150 to 250 kV. The irradiation amount is preferably about 1 to 7 Mrad. A known electron beam irradiation apparatus can be used as the electron beam source.

  The thickness of the surface protective layer is not limited, but is preferably about 0.1 to 15 μm.

<Embossed pattern>
An embossed pattern may be attached to the front surface of the foam wallpaper as necessary. The embossed pattern can be given by, for example, a known embossed plate. For example, a desired embossed pattern can be formed by pressing the embossed plate after heating and softening the front surface of the foamed resin layer. Embossed patterns include wood grain plate conduit grooves, stone plate surface irregularities, cloth surface textures, satin texture, sand texture, hair lines, and multi-line grooves.

The present invention is particularly advantageous in the following points (1) to (5).
(1) By containing a zinc compound as a foaming aid in the foaming agent-containing resin layer, the foaming agent can be decomposed at a low temperature to form a foamed resin layer.
(2) By containing zinc pyrithione in the foamed resin layer, a foamed wallpaper having excellent antifungal properties can be obtained.
(3) Zinc pyrithione does not turn yellow or brown due to heat.
(4) Zinc pyrithione basically does not react with zinc compounds.
(5) The zinc pyrithione can promote the action of the foaming aid (the action of lowering the decomposition temperature of the foaming agent).
(6) As a result of the above (1), (3), (4) and (5), a foamed wallpaper excellent in design and foamability can be produced.

  Hereinafter, the present invention will be described in more detail with reference to Examples and Comparative Examples. However, the present invention is not limited to the examples.

Example 1
In order to form a foaming agent containing resin layer, the composition containing the component of following Table 1 was prepared.

  After melting EVA in the resin composition and kneading the composition, the resulting kneaded product is used to form a foaming agent-containing resin layer having a thickness of 100 μm on a paper substrate having a thickness of 110 μm (basis weight 70 g). Formed. At that time, a press molding machine was used.

  The foaming agent-containing resin layer surface of the laminate was irradiated with an electron beam (200 kV, 5 Mrad) to crosslink EVA contained in the foaming agent-containing resin layer.

  The cross-linked laminate was heated at 220 ° C. for 45 seconds in a gear oven. Thereby, the foaming agent was decomposed, and the foaming agent-containing resin layer was used as the foamed resin layer. The expansion ratio was 5 times, and the thickness of the foamed resin layer was 500 μm.

  Furthermore, the embossing was given to the front side of the foam, and the texture pattern was shaped.

  Through the above process, a foam wallpaper was produced.

Example 2
A foamed wallpaper was prepared in the same manner as in Example 1 except that zinc pyrithione (product name “SAN AIZOL 200” manufactured by Sanai Petroleum) was used as an antifungal agent.

Example 3
Example 1 except that zinc pyrithione (product name “San-Izol 200” manufactured by Sanai Petroleum) and benzimidazole compound (product name “San-Izol 100” manufactured by San-ai Petroleum) were mixed as an antifungal agent. A foamed wallpaper was prepared in the same manner as described above.

Example 4
In order to form the foaming agent-containing resin layer, a resin composition containing the components shown in Table 1 was prepared.
In order to form the non-foamed resin layer A, EMAA (product name “Nucleel N1560” MFR: 60 g / 10 min, methacrylic acid content: 10 wt%, manufactured by Mitsui DuPont Polychemical) was prepared.
In order to form the non-foamed resin layer B, EVA (product name “Ultrasen 750” MFR: 30 g / 10 min, VA content: 32 wt%, manufactured by Tosoh Corporation) was prepared.

Using a three-type three-layer multi-manifold T-die extruder, i) non-foamed resin layer A / ii) foaming agent-containing resin layer / iii) non-foamed resin layer B in order of thickness 10 μm / 100 μm / 10 μm did. The extrusion conditions were as follows: the i) layer resin had a cylinder temperature of 140 ° C., the ii) layer resin composition had a cylinder temperature of 120 ° C., and the iii) layer resin had a cylinder temperature of 100 ° C. The die temperatures were all 120 ° C.
Next, a paper substrate (basis weight 70 g) having a surface temperature of 90 ° C. and a thickness of 110 μm was laminated on the surface of the layer iii) by thermal lamination.
After the corona-treated on the non-foamed resin layer A, further a urethane aqueous emulsion "AL primer, Dainichi Seika Ltd." as primer treatment by a gravure printing machine was 2 g / m ² coating, as picture-printed thereon A texture pattern was printed using an aqueous acrylic ink “Hydric, manufactured by Dainichi Seika Kogyo”.
Next, an ionizing radiation curable resin primer layer (2 μm) was formed on the surface of the pattern layer, and a surface protective layer (ionizing radiation curable resin layer) (10 μm) was further formed on the surface. The primer layer was formed using EBR primer (manufactured by The Inktec). The surface protective layer was formed using Seika Beam EBL-200 (manufactured by Dainichi Seika Kogyo).
The surface protective layer was cured by electron beam irradiation (irradiation amount: 3 Mrad) from above the surface protective layer, and at the same time, the resins contained in the non-foamed resin layer A and the foaming agent-containing resin layer were crosslinked.

  The cured laminate was heated in a gear oven at 220 ° C. for 45 seconds. Thereby, the foaming agent was decomposed, and the foaming agent-containing resin layer was used as the foamed resin layer. The expansion ratio was 5 times, and the thickness of the foamed resin layer was 500 μm.

Furthermore, the embossing was given to the front side of the foam, and the texture pattern was shaped.
Comparative Example 1
A foamed wallpaper was prepared in the same manner as in Example 1 except that a benzimidazole compound (product name “San-Isol 100” manufactured by Sanai Petroleum) was used in place of zinc pyrithione as an antifungal agent.

Comparative Example 2
A foamed wallpaper was prepared in the same manner as in Example 1 except that no fungicide was used.

Test Example 1 (Confirmation of foamability)
The foaming state of the foamed wallpaper produced in Examples 1-4 and Comparative Examples 1-2 was confirmed by visual observation.

  The case where foaming was sufficient was evaluated as ◯, and the case where foaming was insufficient was evaluated as x.

The results are shown in Table 2.
Test example 2 (confirmation of discoloration)
It was confirmed by visual observation whether or not the foamed wallpaper produced in Examples 1 to 4 and Comparative Examples 1 to 2 was discolored.

  A case where no discoloration was observed was evaluated as ◯, a case where slight yellowing or tanning was observed was evaluated as Δ, and a case where yellowing or tanning was remarkable was evaluated as ×. In addition, what was evaluated as (triangle | delta) is suitable for practical use, since the degree of yellowing or yellowish brown is slight.

The results are shown in Table 2.
Test example 3 (mold resistance test)
The foamed wallpaper produced in Example 1 was cut into 40 mm × 40 mm, respectively, to prepare test pieces.

  In accordance with “JIS Z 2911 A method”, a mold resistance test was performed on the test piece. Specifically, the test piece is placed on the following inorganic salt medium, the following five types of mixed spore suspensions are added to the test piece, cultured at 28 ± 4 ° C. for 4 weeks, and then the mycelium on the test piece is The growth state was observed with the naked eye and under a microscope.

The same test was performed on the foamed wallpaper produced in Examples 2 to 4 and Comparative Examples 1 and 2.
[Inorganic salt medium]
NaNO ₃ 2.0g, KH ₂ PO ₄ 0.7g, K ₂ HPO ₄ 0.3g, MgSO ₄ · 7H ₂ O 0.5g, KCl 0.5g, FeSO ₄ · 7H ₂ O 0.01g, glucose 30g, agar 20g, distilled water 1000ml
[5 types of mixed spore suspension]
Aspergillus niger, Penicillium funiculosum, Paecilomyces variotii, Gliocladium virens, Chaetomium globusum
0 that cannot confirm mycelial growth with the naked eye and microscope, 1 that cannot be confirmed with the naked eye, 1 that can be confirmed with the microscope, and mycelial growth can be confirmed with the naked eye. The test piece was evaluated as 2 when it did not exceed 25% of the whole test piece, and 3 when the growth of the mycelium could be confirmed with the naked eye and the area of the growth part of the mycelia exceeded 25% of the whole test piece.

  The results are shown in Table 2.

Claims (6)

A foam wallpaper having antifungal properties,
The foamed wallpaper has a foamed resin layer formed by foaming a foaming agent-containing resin layer containing a foaming aid on a paper-based substrate,
1) The foaming aid is a zinc compound,
2) The foaming agent-containing resin layer further contains zinc pyrithione.
Foam wallpaper. The foamed wallpaper according to claim 1, wherein the content of the zinc pyrithione in the foaming agent-containing resin layer is 0.05 to 10 parts by weight with respect to 100 parts by weight of the resin component in the foaming agent-containing resin layer. The foaming according to claim 1 or 2, wherein the foaming agent-containing resin layer further contains a benzimidazole compound and contains 50 parts by weight or more of the zinc pyrithione with respect to a total amount of the zinc pyrithione and the benzimidazole compound. wallpaper. The foamed wallpaper according to any one of claims 1 to 3, wherein the foamed resin layer and the non-foamed resin layer A are sequentially formed on the paper-based substrate. The foamed wallpaper according to claim 4, wherein a non-foamed resin layer B is further formed between the paper-based substrate and the foamed resin layer. The foamed wallpaper according to claim 4 or 5, wherein a picture pattern layer and a surface protective layer are further formed in order on the non-foamed resin layer A.