JP4816368B2 - Foam wallpaper - Google Patents

Description

  The present invention relates to foamed wallpaper useful for wall decoration.

  Conventionally, foamed wallpaper (foamed decorative sheet) is known in which a foamed resin layer of vinyl chloride resin is formed on a paper-based substrate (backing paper). In recent years, in consideration of the environment, halogen-free resins such as ethylene-vinyl acetate copolymer resin (EVA), acrylic resin, and olefin resin have been used for the foamed resin layer (Patent Document 1). ~ 3 etc.).

  As a layer structure of the foam wallpaper, for example, a laminate in which a foam resin layer and a non-foam resin layer (non-foam resin layer A) are sequentially laminated on a paper base material is known. In such foamed wallpaper, it has been proposed to use an ethylene-methacrylic acid copolymer (EMAA) as a resin component contained in the non-foamed resin layer A in order to increase the scratch resistance of the surface.

  However, foamed wallpaper using EMAA as a resin component contained in the non-foamed resin layer A has the following problems. That is, when an azodicarbonamide (ADCA) type foaming agent is used as the foaming agent when the foamed resin layer is formed by foaming (heating foaming) the foaming agent-containing resin layer, There is a problem that yellowing occurs at the interface with the foamed resin layer A. The above problem is considered to be caused by the reaction between EMAA and ADCA foaming agent.

Since the yellowing may impair the design of the foamed wallpaper, it is required to suppress the occurrence of yellowing or to improve the design so as not to deteriorate even if yellowing occurs. .
Japanese Patent Laid-Open No. 6-47875 JP 2000-255011 A JP 2001-347611 A

  The present invention is a foam wallpaper having a foamed resin layer and a non-foamed resin layer A in order on a paper substrate, and the foamed resin layer is formed by foaming a foaming agent-containing resin layer containing an ADCA-based foaming agent. Even when the non-foamed resin layer A contains EMAA as a resin component, a decrease in design property due to yellowing occurring at the interface between the foamed resin layer and the non-foamed resin layer A is suppressed. Provide foam wallpaper.

  As a result of intensive studies, the present inventor has found that the above object can be achieved when the non-foamed resin layer A contains a specific amount of an inorganic pigment, and has completed the present invention.

That is, the present invention relates to the following foamed wallpaper.
1. A foam wallpaper in which at least a non-foamed resin layer B, a foamed resin layer, and a non-foamed resin layer A are sequentially laminated on a paper-based substrate,
(1) The foamed resin layer is a layer formed by foaming a foaming agent-containing resin layer containing an azodicarbonamide-based thermally decomposable foaming agent,
(2) The non-foamed resin layer A contains an ethylene-methacrylic acid copolymer having a methacrylic acid content of 10 to 15% by weight as a resin component, and titanium dioxide, zinc white, lead white, strontium titanate and Containing 5 to 10% by weight of at least one inorganic pigment selected from the group consisting of lithopone ,
A foam wallpaper in which the non-foamed resin layer B, the foaming agent-containing resin layer, and the non-foamed resin layer A are formed by simultaneous melt extrusion .
2. Item 2. The foamed wallpaper according to Item 1, wherein the foaming agent-containing resin layer contains an ethylene-methacrylic acid copolymer or an ethylene-vinyl acetate copolymer as a resin component.
3 . Item 3. The foamed wallpaper according to Item 1 or 2, wherein the inorganic pigment is titanium dioxide.
4 . Item 4. The foamed wallpaper according to any one of Items 1 to 3 , which is embossed from the top surface layer of the sheet.

Hereinafter, the foamed wallpaper of the present invention will be described in detail.

1. Foam wallpaper The foam wallpaper of the present invention is a foam wallpaper in which at least a foam resin layer and a non-foam resin layer are laminated in order on a paper-based substrate,
(1) The foamed resin layer is a layer formed by foaming a foaming agent-containing resin layer containing an azodicarbonamide (ADCA) -based thermal decomposition foaming agent,
(2) The non-foamed resin layer contains ethylene-methacrylic acid copolymer (EMAA) as a resin component, and contains 5 to 10% by weight of an inorganic pigment.

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 quality substrate is not limited, but preferably about 50 to 300 g / ^{m 2,} about 50 to 80 g / ^{m 2} is more preferable.

Non-foamed resin layer B
In the present invention, a non-foamed resin layer (non-foamed resin layer B) may be formed between the paper substrate and the foamed resin layer as necessary. In particular, when the non-foamed resin layer B is formed as an adhesive layer, excellent adhesion between the paper-based substrate and the foamed resin layer can be obtained.

  As the non-foamed resin layer B, for example, ethylene-vinyl acetate copolymer (EVA) or the like can be suitably used. The non-foamed resin layer B may contain known additives in addition to the resin component, but is preferably blended so that the content of the resin component is 70 to 100% by weight.

  The thickness of the non-foamed resin layer B is not limited, but is preferably about 10 to 50 μm, more preferably about 10 to 20 μm.

Foamed resin layer The foamed resin layer is a layer formed by foaming a foaming agent-containing resin layer containing an ADCA-based foaming agent. Although it does not limit as a resin component contained in a foaming agent containing resin layer, EVA, EMAA, etc. are preferable, for example. Two or more of these resin components may be used.

  Various additives may be added to the foaming agent-containing resin layer. Examples of the additive include a cell regulator, an inorganic filler, a pigment, a stabilizer, a lubricant and the like. For example, the foaming agent-containing resin layer can be suitably formed from a resin composition containing EVA, an inorganic filler, a pigment, an ADCA foaming agent, and a cell regulator.

  When EVA is used as the resin component, the vinyl acetate content (VA content) is not limited, but is preferably about 5 to 30% by weight, more preferably about 10 to 20% by weight.

  When EMAA is used as the resin component, the methacrylic acid content (MAA content) is not limited, but is preferably 15% by weight or less, and more preferably 10-15% by weight.

  The melt flow rate value (MFR) of the resin component is not particularly limited, but is preferably about 5 to 75 g / 10 minutes, and more preferably about 30 to 70 g / 10 minutes.

  In addition, MFR of this specification is the value measured by the test method of JISK7210 (flow test method of thermoplastics). The test condition is that the temperature of “190 ° C., 21.18N (2.16 kgf)” described in JIS K 6922 is 120 ° C.

  The foamed state of the foamed resin layer (for example, the size of foamed cells, the density of foamed cells, etc.) is not limited, and can be appropriately designed according to the type and use of the foamed wallpaper.

  As the foaming agent, an ADCA foaming agent is included. The ADCA-based foaming agent is a pyrolytic foaming agent and foams when heated. In the present invention, a known pyrolytic foaming agent may be used in combination with the ADCA foaming agent. The content of the foaming agent can be appropriately set according to the desired expansion ratio. From the viewpoint of the expansion ratio, it is 1.5 times or more, preferably about 3 to 7 times, and the foaming agent is preferably about 1 to 20 parts by weight with respect to 100 parts by weight of the resin component.

  As the cell adjusting agent, for example, a metal soap such as zinc stearate can be used. The content of the cell modifier is preferably about 0.3 to 10 parts by weight and more preferably about 1 to 5 parts by weight with respect to 100 parts by weight of the resin component.

  Examples of the inorganic filler include calcium carbonate, aluminum hydroxide, magnesium hydroxide, antimony trioxide, zinc borate, and a molybdenum compound. By including an inorganic filler, an effect of suppressing see-through, an effect of improving surface characteristics, and the like are obtained. About 0-100 weight part is preferable with respect to 100 weight part of resin components, and, as for content of an inorganic filler, about 20-70 weight part is more preferable.

  As for the pigment, 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), cadmium red, Inorganic pigments such as ultramarine, bitumen, cobalt blue, chromium oxide, cobalt green, aluminum powder, bronze powder, titanium mica, zinc sulfide; for example, aniline black, perylene black, azo (azo lake, insoluble azo, condensed azo), many Cyclic (isoindolinone, isoindoline, quinophthalone, perinone, flavantron, anthrapyrimidine, anthraquinone, quinacridone, perylene, diketopyrrolopyrrole, dibromanthanthrone, dioxazine, thioindigo, phthalocyanine, indanthrone And organic pigments halogenated phthalocyanine), or the like. The content of the pigment is preferably about 10 to 50 parts by weight and more preferably about 15 to 30 parts by weight with respect to 100 parts by weight of the resin component.

  What is necessary is just to implement according to the method described in the manufacturing method of the postscript as a method of foaming a foaming agent containing resin layer.

Non-foamed resin layer A
The non-foamed resin layer (non-foamed resin layer A) mainly protects the foamed resin layer. In the present invention, a resin component containing EMAA is used. By using EMAA, the scratch resistance of the foamed wallpaper can be enhanced.

  The content of methacrylic acid in the copolymer is preferably 15% by weight or less, more preferably about 10 to 15% by weight. By setting to the above range, an effect of improving scratch resistance is easily obtained.

  The thickness of the non-foamed resin layer A is not limited, but is preferably about 10 to 50 μm, more preferably about 10 to 20 μm.

  Moreover, although content of the said resin component in a resin composition is not limited, Usually, it is preferable to set suitably in the range of 70 to 100 weight%.

  Although the melt flow rate value of the resin component depends on the type of the resin component to be used, etc., it is generally set as appropriate within a range of 10 g / 10 min or more. Usually, it is preferably in the range of 10 to 100 g / 10 minutes, particularly 20 to 80 g / 10 minutes, and more preferably 25 to 60 g / 10 minutes. By using a material having such a numerical range, more excellent scratch resistance, wear resistance and the like can be obtained.

  In the present invention, the non-foamed resin layer A contains 5 to 10% by weight of an inorganic pigment. Such an inorganic pigment is preferably a white pigment, and examples thereof include titanium dioxide, zinc white, lead white, strontium titanate, and lithopone (mixed pigment of zinc oxide and zinc sulfide). Among these white pigments, titanium dioxide is preferable. The average particle diameter and shape of the inorganic pigment are not limited and may be the same as when used as a pigment.

  By using such an inorganic pigment, even if yellowing occurs at the interface between the foamed resin layer and the non-foamed resin layer A, it is possible to mitigate the deterioration of the design. Moreover, when the non-foamed resin layer A contains an inorganic pigment, the non-foamed resin layer A contributes to the improvement of scratch resistance of the foamed wallpaper and also contributes to the improvement of the cutter workability when the foamed wallpaper is cut with a cutter.

Pattern Pattern Layer In the present invention, a pattern pattern layer may be provided on the front surface of the non-foamed resin layer A as necessary.

  The pattern layer imparts design properties to the foamed wallpaper. 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 type of foam wallpaper.

  The pattern pattern layer can be formed, for example, by printing a pattern pattern on the front surface of the non-foamed resin layer A. In addition, when forming a picture pattern layer, you may form a primer layer previously as needed. Examples of printing methods include gravure printing, flexographic printing, silk screen printing, and offset printing. As the printing ink, a printing ink containing a colorant, a binder resin, and a solvent (or a dispersion medium) can be used. These inks may be known or commercially available.

  As the colorant, for example, a pigment used in the above-described foaming agent-containing resin layer can be appropriately used.

  The binder resin is, for example, an acrylic resin, a styrene resin, a polyester resin, a urethane resin, a chlorinated polyolefin resin, a vinyl chloride-vinyl acetate copolymer resin, a polyvinyl butyral resin, an alkyd resin, or a petroleum resin. Examples include resins, ketone resins, epoxy resins, melamine resins, fluorine resins, silicone resins, fiber derivatives, rubber resins, 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; and water.

  The thickness of the design pattern layer is different from the type of design pattern, but is generally preferably about 0.1 to 10 μm.

Surface protective layer (overcoat layer)
In the present invention, a surface protective layer may be provided on the surface of the design pattern layer for the purpose of adjusting the gloss and / or protecting the design pattern layer. The kind of surface protective layer is not limited. If it is a surface protective layer aiming at gloss adjustment, there exists a surface protective layer containing known fillers, such as a silica, for example. As a method for forming the surface protective layer, a known method such as gravure printing can be employed. In addition, when the adhesiveness of a pattern pattern layer and a surface protective layer is not fully acquired, a surface protective layer can also be provided after carrying out the adhesion process (primer process) of the surface of a pattern pattern layer.

  When forming a surface protective layer for the purpose of surface strength (such as scratch resistance) of foamed wallpaper, stain resistance, protection of the pattern layer, etc., those containing ionizing radiation curable resins as resin components are suitable. is there. The ionizing radiation curable resin is preferably one that undergoes radical polymerization (curing) by electron beam irradiation.

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

Embossing In this invention, you may attach | subject an embossing pattern suitably. In this case, embossing may be performed on the outermost surface layer (the side opposite to the paper-based substrate) of the foam wallpaper. Embossing can be performed by known means such as pressing an embossed plate. For example, when the outermost surface layer is a surface protective layer, a desired embossed pattern can be formed by pressing the embossed plate after heat-softening the front surface. 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.

2. The manufacturing method of foaming wallpaper The manufacturing method of foaming wallpaper is not specifically limited. For example, a foam wallpaper having a foamed resin layer and a non-foamed resin layer A on a paper-based substrate is heated after film formation by simultaneous melt extrusion of the foaming agent-containing resin layer and the non-foamed resin layer A on a paper-based substrate. Thus, the foaming agent-containing resin layer is obtained as a foamed resin layer.

  For simultaneous melt extrusion, a multi-manifold type T-die capable of simultaneously forming two layers can be used. In this case, the resin composition for forming the foaming agent-containing resin layer and the resin composition for forming the non-foamed resin layer are placed in separate cylinders, and two types and two layers are simultaneously extruded to form and laminate. That's fine. In this method, the coextruded laminate is simultaneously laminated (film formation) on a paper-based substrate. The resin layer laminated simultaneously with extrusion on the paper base is bonded to the paper base because it has adhesiveness by heat melting.

  Alternatively, a laminate in which two types and two layers are simultaneously formed in advance may be prepared, placed on a paper substrate, and bonded to the paper substrate by heat lamination.

  In addition, when an inorganic filler is contained in the resin composition forming the foaming agent-containing resin layer, and the foaming agent-containing resin layer is formed by extrusion molding, an extrusion port (so-called die) of an extrusion molding machine is used. Inorganic filler residues (so-called eyes and eyes) are likely to occur, and this tends to be a foreign matter on the sheet surface. Therefore, when the inorganic filler is contained in the resin composition forming the foaming agent-containing resin layer, the non-foaming resin layer A and the non-foaming resin layer B can be coextruded together with the foaming agent-containing resin layer. preferable. Thus, by simultaneously extruding and molding the foaming agent-containing resin layer between the non-foamed resin layers, it is possible to suppress the occurrence of the eyes. In the present invention, the non-foamed resin layer A contains an inorganic pigment. However, since the content is kept as low as 5 to 10% by weight, the non-foamed resin layer A is hardly generated.

  After simultaneous lamination on the paper substrate, the foamed resin layer is formed by heating the foaming agent-containing resin layer. The heating conditions are not limited as long as the foamed resin layer is formed by the decomposition of the pyrolytic foaming agent. The heating temperature is preferably about 210 to 240 ° C., and the heating time is preferably about 20 to 80 seconds.

  Electron beam irradiation may be performed before the heat treatment. Thereby, since the resin component 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 performed using a chemical crosslinking agent (also referred to as a crosslinking agent or a crosslinking aid).

  In the case of performing electron beam irradiation, the composition may contain a crosslinking agent. Any crosslinking agent that promotes crosslinking by electron beam irradiation may be used. Examples thereof include polyfunctional monomers such as neopentyl glycol dimethacrylate and trimethylolpropane trimethacrylate, oligomers, and the like. The crosslinking agent is preferably about 0 to 10 parts by weight, more preferably 1 to 4 parts by weight, based on 100 parts by weight of the resin component.

  When a surface protective layer containing an ionizing radiation curable resin is formed, the surface protective layer can be cured by electron beam irradiation. Such electron beam irradiation can be performed simultaneously (same processing) as electron beam irradiation performed to crosslink the resin contained in the foaming agent-containing resin layer. That is, after forming the foaming agent-containing resin layer, the non-foaming resin layer A, the pattern layer and the surface protective layer containing the ionizing radiation curable resin in order, the resin contained in the foaming agent-containing resin layer is irradiated with an electron beam. And the resin contained in the surface protective layer can be cured.

  When producing a foam wallpaper having a pattern layer, it is preferable to form the pattern layer on the surface of the non-foamed resin layer before the heat treatment. The pattern pattern layer may be formed as described above.

  Since the foamed wallpaper of the present invention contains 5 to 10% by weight of an inorganic pigment in the non-foamed resin layer A, even if yellowing occurs at the interface between the foamed resin layer and the non-foamed resin layer A, the design thereby The decline in sex is suppressed. Further, the non-foamed resin layer A containing an inorganic pigment contributes to an improvement in scratch resistance of the foamed wallpaper and also contributes to an improvement in cut processability when the foamed wallpaper is cut with a cutter.

  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
Using a three-type three-layer multi-manifold T-die extruder, the non-foamed resin layer A / foaming agent-containing resin layer / non-foamed resin layer B were extruded and formed on the backing paper in the order of thickness 10 μm / 100 μm / 10 μm. . As a result, a laminate comprising backing paper / non-foamed resin layer B / foaming agent-containing resin layer / non-foamed resin layer A was obtained.

  Extrusion conditions were such that the cylinder temperature containing the resin composition for forming the non-foamed resin layer A was 140 ° C., the cylinder temperature containing the resin composition for forming the foaming agent-containing resin layer was 120 ° C., The cylinder temperature in which the resin for forming the non-foamed resin layer B was accommodated was 100 ° C. The die temperature was 120 ° C. for all.

  The laminate was irradiated with an electron beam (200 KV, 3 Mrad) from the non-foamed resin layer A side, and the foaming agent-containing resin layer and the non-foamed resin layer B were cross-linked. Further, a corona discharge treatment was performed on the non-foamed resin layer A.

Next, an EVA-based aqueous emulsion was applied on the non-foamed resin layer A (2 g / m ² ) to form a primer layer, and a fabric pattern was printed with an aqueous ink “Hydric” (manufactured by Dainichi Seika Kogyo). .

  Next, the laminate on which the fabric pattern was printed was heated in a gear oven (220 ° C. × 30 seconds) to foam the foaming agent-containing resin layer.

  Finally, a foamed wallpaper was obtained by embossing the fabric with a texture pattern.

  Each layer was formed using the following components.

  Non-foamed resin layer A is composed of 90 parts by weight of EMAA “Nucleel N1560 (MAA content: 15%), made by Mitsui DuPont Polychemical” and 10 parts by weight of titanium dioxide (inorganic pigment) “Tai Pure R-108, made by DuPont”. It formed with the resin composition which becomes.

  The foaming agent-containing resin layer consists of EVA “Evaate H4011 (VA content: 20%, melting point: 84 ° C.), Sumitomo Chemical” 100 parts by weight, calcium carbonate “Whiteon H, manufactured by Toyo Fine Chemical” 40 parts by weight, titanium dioxide 20 parts by weight of “Tai Pure R-108, manufactured by DuPont”, 4 parts by weight of ADCA-based foaming agent “Vinole AC # 3, manufactured by Eiwa Kasei Kogyo”, 5 parts by weight of stabilizer “Adeka Stub OF-101, manufactured by ADEKA” and a crosslinking aid It was formed from a resin composition consisting of 1 part by weight of “OPSTAR JUA-702, manufactured by JSR”.

  As the two types of resin compositions, pellets obtained by strand cutting after kneading each component were used.

  The non-foamed resin layer B was formed by EVA “Evaflex EV150 (VA content: 33%, melting point: 61 ° C.), made by Mitsui DuPont Polychemical”.

Example 2
The foaming agent-containing resin layer is made up of 100 parts by weight of EMAA “Nucrel N035C (MAA content: 10%), made by Mitsui DuPont Polychemical”, 40 parts by weight of calcium carbonate “Whiteon H, made by Toyo Fine Chemical”, and titanium dioxide “Taipea”. The foamed wallpaper was made in the same manner as in Example 1 except that the resin composition was formed of 20 parts by weight of “R-108, made by DuPont” and 4 parts by weight of ADCA-based foaming agent “Vinifer AC # 3, made by Eiwa Chemical Industries”. Obtained.

Comparative Example 1
A foamed wallpaper was obtained in the same manner as in Example 1 except that the non-foamed resin layer A was formed only from EMAA “Nucleel N1560 (MAA content: 15%).

Comparative Example 2
A foamed wallpaper was obtained in the same manner as in Example 1 except that the non-foamed resin layer A was formed only from EMAA “Nucleel N1035 (MAA content: 10%).

Comparative Example 3
A foamed wallpaper was obtained in the same manner as in Example 1 except that the non-foamed resin layer A was formed only from EMAA “Nucrel N0200H (MAA content: 2%).

Comparative Example 4
A foamed wallpaper was obtained in the same manner as in Example 1 except that the titanium dioxide content of the non-foamed resin layer A was 15 parts by weight.

Comparative Example 5
A foamed wallpaper was obtained in the same manner as in Example 1 except that the titanium dioxide content of the non-foamed resin layer A was changed to 4 parts by weight.

Test example 1
Regarding foamed wallpaper produced in Examples and Comparative Examples, 1) extrusion processability during production, 2) degree of yellowing of foamed wallpaper, and 3) scratch resistance of foamed wallpaper were evaluated. The results are shown in Table 1 below.

  The evaluation criteria for each evaluation item were as follows.

1) Extrudability ○: No film formation was observed during film formation, and film formation was uniform.
X: Occurrence of eyes and eyes was observed during film formation, leaving streaks on the surface.

2) Degree of yellowing The yellowness of the foamed wallpaper was evaluated by measuring with a color difference meter. As the color difference meter, a color difference meter of CIE 1976 Lab color system (JIS Z 8729) was used. The whiteness of the foamed wallpaper was measured using a color difference meter, and the degree of yellowness (b value) was evaluated.
◎… less than 5 ○… 5 or more and less than 5.5 Δ… 5.5 or more and less than 6 ×… 6 or more 3) Scratch resistance The scratch resistance of the front surface of each decorative sheet was established by the Wallpaper Product Standards Council. Evaluation of surface-enhanced wallpaper It was evaluated by the enhanced performance test method.
◎… No traces on the surface ○… Slight traces on the surface Δ… Resin layer is slightly broken ×… Resin layer appears to be broken

Claims (4)

A foam wallpaper in which at least a non-foamed resin layer B, a foamed resin layer, and a non-foamed resin layer A are sequentially laminated on a paper-based substrate,
(1) The foamed resin layer is a layer formed by foaming a foaming agent-containing resin layer containing an azodicarbonamide-based thermally decomposable foaming agent,
(2) The non-foamed resin layer A contains an ethylene-methacrylic acid copolymer having a methacrylic acid content of 10 to 15% by weight as a resin component, and titanium dioxide, zinc white, lead white, strontium titanate and Containing 5 to 10% by weight of at least one inorganic pigment selected from the group consisting of lithopone ,
A foam wallpaper in which the non-foamed resin layer B, the foaming agent-containing resin layer, and the non-foamed resin layer A are formed by simultaneous melt extrusion . The foamed wallpaper according to claim 1, wherein the foaming agent-containing resin layer contains an ethylene-methacrylic acid copolymer or an ethylene-vinyl acetate copolymer as a resin component.   The foamed wallpaper according to claim 1 or 2, wherein the inorganic pigment is titanium dioxide. The foamed wallpaper according to any one of claims 1 to 3 , wherein embossing is performed from above the outermost surface layer of the sheet.