JP4775213B2 - 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 non-foamed resin layer A, a foamed resin layer, and a non-foamed resin layer B are sequentially laminated on a paper base. Such foamed wallpaper is produced by, for example, laminating a non-foamed resin layer A, a foaming agent-containing resin layer, and a non-foaming resin layer B on a paper substrate by simultaneous melt extrusion, and then foaming the foaming agent-containing resin layer. To do.

  In the foam wallpaper having the above-described layer structure, one containing an ethylene-methacrylic acid copolymer (EMAA) and / or EVA is known as a resin component of the foam resin layer. In particular, EMAA as a resin component is preferable because it easily improves the surface strength (scratch resistance, etc.) of the foam wallpaper. The effect of improving the surface strength is superior to EVA in comparison to EVA.

  However, foamed wallpaper using EMAA for the foamed resin layer must be heat-treated at a high temperature (about 240 ° C.) when the foaming agent-containing resin layer is foamed to obtain a foamed wallpaper. There is a problem that a considerable time is required for the process or the paper base is burnt.

The reason why the high-temperature heat treatment is required is that the zinc-based foaming auxiliary agent used together with the pyrolytic foaming agent and used for lowering the heating temperature of the foaming process does not sufficiently exhibit the effect under the EMAA resin. It is possible.
Japanese Patent Laid-Open No. 6-47875 JP 2000-255011 A JP 2001-347611 A

  The present invention is a foamed wallpaper in which at least a non-foamed resin layer A, a foamed resin layer, and a non-foamed resin layer B are sequentially laminated on a paper-based substrate, and the foamed wallpaper has good scratch resistance and is simultaneously melted. Even when a foamed wallpaper is produced through a process including extrusion and heat foaming, an object is to provide a foamed wallpaper having better processability than when EMAA is used as a resin component in the foamed resin layer.

  As a result of intensive studies, the present inventor has found that the above object can be achieved when a specific resin component is employed in the foamed resin layer, 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 A, a foamed resin layer, and a non-foamed resin layer B are sequentially laminated on a paper-based substrate,
(1) The foamed wallpaper is obtained by laminating at least a non-foamed resin layer A, a foaming agent-containing resin layer, and a non-foaming resin layer B on a paper base by simultaneous melt extrusion, and then foaming the foaming agent-containing resin layer to obtain a foamed resin. Formed by layering,
(2) The non-foamed resin layer A is formed from a resin composition containing an ethylene-methyl methacrylate copolymer,
(3) The foaming agent-containing resin layer is formed from a resin composition containing an ethylene-methyl methacrylate copolymer,
(4) The foamed wallpaper, wherein the non-foamed resin layer B is formed from a resin composition containing an ethylene-methacrylic acid copolymer.
2. Item 2. The foamed wallpaper according to Item 1, wherein the foaming agent-containing resin layer contains an azodicarbonamide-based foaming agent as a foaming agent, and further contains a zinc-based foaming aid.
3. Item 3. The foamed wallpaper according to Item 1 or 2, wherein the simultaneous melt extrusion is simultaneous melt extrusion by a T die.
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 foamed wallpaper.
5. A method for producing foam wallpaper having the following steps:
(1) On a paper base, at least a non-foamed resin layer A containing an ethylene-methyl methacrylate copolymer, a foaming agent-containing resin layer containing an ethylene-methyl methacrylate copolymer, and an ethylene-methacrylic acid copolymer Step 1 of laminating non-foamed resin layer B containing
(2) Step 2 of forming a foamed resin layer by foaming the foaming agent-containing resin layer.

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

1. Foamed wallpaper The foamed wallpaper of the present invention is a foamed wallpaper in which at least a non-foamed resin layer A, a foamed resin layer, and a non-foamed resin layer B are sequentially laminated on a paper substrate,
(1) The foamed wallpaper is obtained by laminating at least a non-foamed resin layer A, a foaming agent-containing resin layer, and a non-foaming resin layer B on a paper base by simultaneous melt extrusion, and then foaming the foaming agent-containing resin layer to obtain a foamed resin. Formed by layering,
(2) The non-foamed resin layer A is formed from a resin composition containing an ethylene-methyl methacrylate copolymer (EMMA),
(3) The foaming agent-containing resin layer is formed from a resin composition containing an ethylene-methyl methacrylate copolymer (EMMA),
(4) The non-foamed resin layer B is formed from a resin composition containing an ethylene-methacrylic acid copolymer (EMAA).

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 A (adhesive layer)
A non-foamed resin layer A is laminated on the paper base. The non-foamed resin layer A is formed from a resin composition containing EMMA. That is, in the present invention, the non-foamed resin layer A is formed by melt extrusion of a resin composition containing EMMA.

  The resin component may be essentially only EMMA, but if necessary, other resin components (such as EVA) may be added with EMMA as the main component.

  In addition, a known additive may be included. However, it is preferable to mix | blend so that content of a resin component may be 70 to 100 weight% in that case.

  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.

Foamed resin layer The foamed resin layer is formed by foaming a foaming agent-containing resin layer formed by melt extrusion.

  In the present invention, the foaming agent-containing resin layer is formed from a resin composition containing EMMA. That is, in this invention, it forms into a film by melt-extruding the resin composition containing EMMA, and forms a foaming agent containing resin layer. In addition, you may include another resin component in the range which does not impair the effect of this invention.

  The methyl methacrylate content (MMA content) of EMMA is not limited, but is preferably 25% by weight or less, and more preferably 10 to 20% by weight.

  The melt flow rate value (MFR) of the resin component is not particularly limited, but is preferably about 15 to 60 g / 10 minutes, and more preferably about 20 to 40 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 resin composition includes a pyrolytic foaming agent. As the pyrolytic foaming agent, an azodicarbonamide (ADCA) foaming agent is preferable. Moreover, you may include various additives in a resin composition. For example, the resin composition can include EMMA, an inorganic filler, a pigment, an ADCA-based foaming agent, a foaming aid, and a cell modifier. In addition, stabilizers, lubricants and the like can be added.

  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.

  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.

  In the present invention, it is preferable to use a zinc-based foaming aid as the foaming aid. The zinc-based foaming aid contributes to a reduction in the foaming temperature of the ADCA-based foaming agent. Further, the zinc-based foaming auxiliary agent is not deactivated under EMMA, and the foaming temperature can be significantly reduced. This contributes to improving the productivity of foam wallpaper. Although content of a foaming adjuvant is not limited, about 1-10 weight part is preferable with respect to 100 weight part of resin components, and about 3-8 weight part is more preferable.

  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 B
The non-foamed resin layer (non-foamed resin layer B) mainly protects the foamed resin layer. In the present invention, the non-foamed resin layer B is formed from a resin composition containing EMAA. That is, in the present invention, the non-foamed resin layer B is formed by melt extrusion of a resin composition containing EMAA. Thus, by using EMAA as the resin component, the scratch resistance of the foamed wallpaper can be enhanced.

  As the resin component, only EMAA may be used, but if necessary, another resin component may be added while mainly using EMAA. In addition, a known additive may be included. However, it is preferable to mix | blend so that content of a resin component may be 70 to 100 weight% in that case.

  The content of methacrylic acid in the copolymer is preferably 15% by weight or less, more preferably about 10 to 15% by weight.

  Although the melt flow rate value of the resin component depends on the type of the resin component used, etc., it is generally set as appropriate within a range of 15 g / 10 minutes or more. Usually, it is preferably in the range of 20 to 100 g / 10 minutes, particularly 25 to 90 g / 10 minutes, and more preferably 30 to 70 g / 10 minutes. By using a material having such a numerical range, more excellent scratch resistance, wear resistance and the like can be obtained.

  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.

Pattern Pattern Layer In the present invention, a pattern pattern layer may be provided on the front surface of the non-foamed resin layer B 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 B. 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 for the purpose of gloss adjustment, for example, there is a surface protective layer containing a known filler such as silica (average particle size: preferably about 3 to 30 μm, more preferably about 5 to 20 μm). 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. In the present invention, after laminating at least the non-foamed resin layer A, the foaming agent-containing resin layer, and the non-foaming resin layer B on the paper substrate, the foaming agent-containing resin layer is foamed to obtain a foamed resin layer. By manufacturing.

  The resin (resin composition) for forming each layer is simultaneously melt extruded by using a T die, for example. In particular, a multi-manifold type T-die is preferable because of multilayer coextrusion. Specifically, each resin composition may be placed in a separate cylinder, and three types and three layers may be simultaneously extruded to form a film and laminated. 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.

  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. However, in the present invention, since the non-foamed resin layers A and B are also simultaneously melt-extruded with the foaming agent-containing resin layer sandwiched therebetween, the occurrence of the above-mentioned eyes is suppressed.

  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 230 to 240 ° C., and the heating time is preferably about 30 to 80 seconds. Moreover, when using together a zinc type foaming adjuvant with an ADCA type foaming agent, heating temperature can be reduced significantly. For example, the heating temperature can be reduced to about 210 ° C. In the present invention, since EMMA is contained as a resin component in the foaming agent-containing resin layer, productivity can be increased by reducing the heating temperature.

  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 a foaming agent-containing resin layer, a non-foaming resin layer, a pattern layer, and a surface protective layer containing an ionizing radiation curable resin in this order, the resin contained in the foaming agent-containing resin layer is irradiated with an electron beam. The resin contained in the surface protective layer can be cured while being crosslinked.

  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.

  According to the present invention, it is a foamed wallpaper in which at least a non-foamed resin layer A, a foamed resin layer, and a non-foamed resin layer B are sequentially laminated on a paper substrate, and the scratch resistance of the foamed wallpaper is good, Even in the case of producing a foamed wallpaper through a process including simultaneous melt extrusion and heat foaming, it is possible to provide a foamed wallpaper having better processability than when EMAA is used as a resin component.

  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, non-foamed resin layer B / foaming agent-containing resin layer / non-foamed resin layer A were extruded and formed on the backing paper in the order of thickness 10 μm / 100 μm / 10 μm. . Thereby, the laminated body which consists of non-foaming resin layer B / foaming agent containing resin layer / non-foaming resin layer A / backing paper was obtained.

  As the backing paper, “NI-65A (manufactured by Nippon Paper Industries Co., Ltd.)” was prepared, heated to 90 ° C., and then the above three layers were extruded to form a film.

  Extrusion conditions were 115 ° C. for the cylinder containing the resin for forming the non-foamed resin layer B, 110 ° C. for the cylinder containing the resin composition for forming the foam-containing resin layer, and non-foaming The cylinder temperature in which the resin for forming the resin layer A was accommodated was 100 ° C. The die temperature was 110 ° C. for all.

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

Next, an EVA aqueous emulsion was applied on the non-foamed resin layer B (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.), and the foaming agent-containing resin layer was foamed until the foaming ratio was 4 times or more.

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

  Each layer was formed using the following components.

  The non-foamed resin layer B was formed by EMAA “Nucrel N1560, manufactured by Mitsui DuPont Polychemical”.

  The foaming agent-containing resin layer is composed of 80 parts by weight of EMMA “ACRlift WH401, manufactured by Sumitomo Chemical”, 20 parts by weight of EMMA “ACRlift CM5021, manufactured by Sumitomo Chemical”, 40 parts by weight of calcium carbonate “Whiteon H, manufactured by Toyo Fine Chemical”, titanium dioxide. 20 parts by weight of “Tai Pure R-108, manufactured by DuPont”, 4.5 parts by weight of ADCA foaming agent “Vinihole AC # 3, manufactured by Eiwa Kasei Kogyo” and 3 parts by weight of foaming aid “MFX-50E, manufactured by Daikyo Kasei Kogyo” , “Adeka Stub OF-101, manufactured by ADEKA” was formed from a resin composition consisting of 5 parts by weight.

  The non-foamed resin layer A was formed by EMMA “Aklift WK402, manufactured by Sumitomo Chemical”.

Comparative Example 1
The EMMA resin of the foaming agent-containing resin layer of Example 1 was 80 parts by weight of EMAA resin “Nucleel N035C, manufactured by Mitsui / DuPont Polychemical” and 20 parts by weight of “Nucrel N1050H, manufactured by Mitsui / DuPont Polychemical”. The rest is the same.

Comparative Example 2
The EMMA resin of the foaming agent-containing resin layer of Example 1 was 90 parts by weight of EVA resin “Evaflex V406, made by Mitsui DuPont Polychemical” and 10 parts by weight “Evaflex V577, made by Mitsui DuPont Polychemical”. The rest is the same.

Test example 1
The surface characteristics (scratch resistance) and productivity (productivity in the foaming process) of the foamed wallpaper produced in Examples and Comparative Examples were evaluated. Evaluation methods and results (Table 1) are shown below.

<Scratch resistance>
In accordance with the surface wallpaper strengthening performance regulations established by the Wallpaper Product Standards Council, the friction was moved 10 times. Specifically, the procedure was as follows. A test piece (foamed wallpaper) was attached to a Gakushin abrasion tester (JIS L0849 abrasion tester type II). Using a metal claw designated by the group as a friction machine of the testing machine, a load of 200 g was applied to the tip of the metal claw and reciprocated on the test piece a specified number of times. The surface condition of the test piece after the test was visually observed.

  Evaluation of scratch resistance in the above-mentioned regulations is as follows: Grade 5: No change, Grade 4: A little change on the surface, Grade 3: The surface appears torn, Grade 2: The surface is torn and a backing material such as paper is visible (long) Less than 1 cm) First grade: Five levels, the surface was torn and the backing material such as paper was visible (length of 1 cm or more).

  In Table 1, ◎: Grade 5, ○: Grade 4, Δ: Grade 3, ×: (Grade 2, Grade 1).

<Productivity>
The determination was made based on the time required for the expansion ratio to be 4 times or more in an atmosphere at 220 ° C.

○: Less than 40 seconds ×: 40 seconds or more

Claims (5)

A foam wallpaper in which at least a non-foamed resin layer A, a foamed resin layer, and a non-foamed resin layer B are sequentially laminated on a paper-based substrate,
(1) The foamed wallpaper is obtained by laminating at least a non-foamed resin layer A, a foaming agent-containing resin layer, and a non-foaming resin layer B on a paper base by simultaneous melt extrusion, and then foaming the foaming agent-containing resin layer to obtain a foamed resin. Formed by layering,
(2) The non-foamed resin layer A is formed from a resin composition containing an ethylene-methyl methacrylate copolymer,
(3) The foaming agent-containing resin layer is formed from a resin composition containing an ethylene-methyl methacrylate copolymer,
(4) The foamed wallpaper, wherein the non-foamed resin layer B is formed from a resin composition containing an ethylene-methacrylic acid copolymer.   The foaming wallpaper according to claim 1, wherein the foaming agent-containing resin layer contains an azodicarbonamide foaming agent as a foaming agent, and further contains a zinc foaming aid.   The foamed wallpaper according to claim 1, wherein the simultaneous melt extrusion is simultaneous melt extrusion by a T-die.   The foamed wallpaper according to any one of claims 1 to 3, wherein embossing is performed on the outermost surface layer of the foamed wallpaper. A method for producing foam wallpaper having the following steps:
(1) On a paper base, at least a non-foamed resin layer A containing an ethylene-methyl methacrylate copolymer, a foaming agent-containing resin layer containing an ethylene-methyl methacrylate copolymer, and an ethylene-methacrylic acid copolymer Step 1 of laminating non-foamed resin layer B containing
(2) Step 2 of forming a foamed resin layer by foaming the foaming agent-containing resin layer.