JP4667151B2 - Foam wallpaper - Google Patents

Description

  The present invention relates to foam wallpaper.

  Conventionally, as foam wallpaper, a paper base (backing paper) in which a foam resin layer made of a vinyl chloride resin is formed is known. In recent years, in consideration of the environment, resins that do not contain halogen such as ethylene-vinyl acetate copolymer resin, acrylic resin, and olefin resin have been used for the foamed resin layer (Patent Documents 1 to 3). .

  Specifically, paint containing a microcapsule type foaming agent in an emulsion containing an acrylic resin and ethylene-vinyl acetate copolymer resin is applied to a paper substrate, dried, and then a pattern layer printed on the surface. Then, after foaming the resin layer, a foamed wallpaper is known in which a concavo-convex pattern is formed by an embossed plate. In addition, an unfoamed resin layer made of a composition containing an ethylene-vinyl acetate copolymer resin and a thermally decomposable foaming agent is extruded on a paper substrate by a T-die extruder, and then a pattern layer is formed on the surface. There is known a foamed wallpaper obtained by printing, then foaming an unfoamed resin layer, and then forming an uneven pattern with an embossed plate.

  Here, as the non-foamed resin layer for protecting the foamed resin layer, an ethylene-methacrylic acid copolymer resin is used because of excellent scratch resistance.

  However, when ethylene-methacrylic acid copolymer resin is used, bubbles generated from the unfoamed resin layer (layer before the foamed resin layer is foamed) in the process of heating the unfoamed resin layer to the foamed resin layer. However, there is a problem of breaking through the non-foamed resin layer that protects the unfoamed resin layer (so-called bubble removal occurs). Thereby, the non-foamed resin layer is in a state in which a hole is formed on the surface thereof. Therefore, if dirt adheres to the surface, it becomes difficult to remove the dirt. Further, since the bubbles are released to the outside of the foam wallpaper, the foam volume of the foam resin layer is reduced (foamability is inferior). As a result, not only the design of the foam wallpaper is deteriorated, but also the scratch resistance is inferior.

For this reason, when ethylene-methacrylic acid copolymer resin is used as a protective layer for the foamed resin layer, it is desired to have a foamed wallpaper that suppresses air bubbles and is excellent in foamability, design properties, scratch resistance, and the like. Yes.
Japanese Patent Laid-Open No. 6-47875 JP 2000-255011 A JP 2000-347611 A

  The main object of the present invention is to provide a foam wallpaper that can suppress or prevent air bubbles from being lost when the foamed resin layer is heated and foamed, particularly when an ethylene-methacrylic acid copolymer resin is used as a protective layer for the foamed resin layer. To do.

  As a result of intensive studies, the inventor has found that the above object can be achieved by adopting a specific layer structure, 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 foamed resin layer and a non-foamed resin layer are sequentially formed on a paper substrate,
(1) The foamed resin layer is a layer formed by foaming a foaming agent-containing resin layer that is crosslinked by electron beam irradiation ,
(2) The non-foamed resin layer is formed by a resin composition containing at least one polymer of an ethylene-methacrylic acid copolymer, an ethylene-acrylic acid copolymer and an ionomer resin as a resin component, and is crosslinked. Sodea Ru,
Foam wallpaper characterized by that.
2. Item 2. The foamed wallpaper according to Item 1, wherein the non-foamed resin layer has a thickness of 10 µm or less.
3. Item 2. The foamed wallpaper according to Item 1, wherein the resin component of the non-foamed resin layer has a melt flow rate value of 100 g / 10 min or more.
4). The non-foamed resin layer thickness is not more 10μm or less, and the melt flow rate value of the resin component of the non-foamed resin layer is 100 g / 10 min or more, the foam picture according to the claim 1.
5 . Item 5. The foamed wallpaper according to any one of Items 1 to 4 , wherein the polymer content of the non-foamed resin layer is 70 to 100% by weight in the resin composition.
6). The foaming agent-containing resin layer is formed from a resin composition containing, as a resin component, at least one ethylene copolymer resin of ethylene-vinyl acetate copolymer resin, ethylene-methyl methacrylate, ethylene-ethyl acrylate, and ethylene-methyl acrylate. The foamed wallpaper according to any one of Items 1 to 5, wherein the resin component has a melt flow rate value of 5 to 75 g / 10 min.
7 . Item 7. The foamed wallpaper according to any one of Items 1 to 6 , wherein the foaming agent-containing resin layer contains a foaming agent, and the foaming agent is a pyrolytic foaming agent.
8 . Any one of Items 1 to 7 , wherein the foaming agent-containing resin layer is formed of a resin composition containing an ethylene-vinyl acetate copolymer resin, an inorganic filler, a pigment, a thermal decomposition foaming agent, and a cell regulator. Foam wallpaper according to crab.
9 . Item 9. The foamed wallpaper according to any one of Items 1 to 8 , wherein a non-foamed resin layer is further formed between the paper substrate and the foamed resin layer.
10 . Item 10. The foamed wallpaper according to any one of Items 1 to 9 , which is embossed from the top surface layer of the sheet.
11 . Item 11. The decorative sheet for wall covering according to any one of Items 1 to 10 , wherein a crosslinking agent is contained in at least one of the foaming agent-containing resin layer and the non-foaming resin layer.

  According to the present invention, since the non-foamed resin layer contains 70 to 100% by weight of the ethylene-methacrylic acid copolymer resin and the ethylene-methacrylic acid copolymer resin is crosslinked, the foaming agent-containing resin layer Since there is a cross-linked unfoamed resin layer when foaming is heated and foamed, it is possible to prevent air bubbles from being lost when the foaming agent foams. In particular, when the thickness is small, even when the melt flow rate of the resin constituting the non-foamed resin layer is large, it is possible to prevent air bubbles from being lost.

  Further, since the bubbles generated by heating are not released to the outside, the foaming volume (foaming property) is improved and the scratch resistance is also excellent.

<Foam wallpaper>
The foamed wallpaper of the present invention (the present invention sheet) is a foamed wallpaper in which at least a foamed resin layer and a non-foamed resin layer are sequentially formed on a paper-based substrate,
(1) The foamed resin layer is a layer formed by foaming the foaming agent-containing resin layer,
(2) The non-foamed resin layer is a layer formed of a resin composition containing, as a resin component, a polymer obtained using at least one of acrylic acid and methacrylic acid as a monomer,
(3) At least the non-foamed resin layer is crosslinked,
It is characterized by that.

  In particular, the foamed wallpaper (present sheet) of the present invention includes the following first and second inventions.

The first invention is a foam wallpaper in which at least a foam resin layer and a non-foam resin layer are sequentially formed on a paper-based substrate,
(1) The foamed resin layer is a layer formed by foaming the foaming agent-containing resin layer,
(2) The non-foamed resin layer is a layer formed of a resin composition containing, as a resin component, a polymer obtained using at least one of acrylic acid and methacrylic acid as a monomer,
(3) At least the non-foamed resin layer is cross-linked,
(4) The thickness of the non-foamed resin layer is 10 μm or less.
It is characterized by that.

The second invention is a foam wallpaper in which at least a foamed resin layer and a non-foamed resin layer are sequentially formed on a paper-based substrate,
(1) The foamed resin layer is a layer formed by foaming the foaming agent-containing resin layer,
(2) The non-foamed resin layer is a layer formed of a resin composition containing, as a resin component, a polymer obtained using at least one of acrylic acid and methacrylic acid as a monomer,
(3) At least the non-foamed resin layer is cross-linked,
(4) The melt flow rate value of the resin component is 100 g / 10 min or more.
It is characterized by that.

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 can be obtained. As the non-foamed resin layer B, for example, an ethylene-vinyl acetate copolymer can be suitably used.

Foamed resin layer The foamed resin layer is a layer formed by foaming the foaming agent-containing resin layer. The foaming agent-containing resin layer is not limited as long as it is foamed by the action of the foaming agent (for example, foamed when heated), but obtained from a combination of monomers such that the resin layer does not contain hydrogen bonds. It is preferable to use a resin that can be used. 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, examples of the ethylene copolymer resin include ethylene-vinyl acetate copolymer resin (hereinafter abbreviated as “EVA”), ethylene-methyl methacrylate (EMMA), ethylene-ethyl acrylate (EEA), ethylene-methyl. Acrylate (EMA) or the like can be used. In particular, it is desirable that the resin component is formed of a resin composition containing EVA resin. For example, a resin composition containing an EVA resin, an inorganic filler, a pigment, a thermal decomposable foaming agent, and a cell regulator can be suitably used. In addition, stabilizers, lubricants, and the like can be used as additives.

  When EVA resin is used as the resin component, the vinyl acetate content (copolymerization ratio) of the EVA resin is not limited, but is preferably about 5 to 30% by weight, more preferably about 10 to 20% 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 40 to 70 g / 10 minutes.

  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 pyrolytic foaming agent can be selected from known foaming agents. For example, azo compounds such as azodicarbonamide (ADCA) and azobisformamide; and bidazides such as oxybenzenesulfonyl hydrazide (OBSH) and paratoluenesulfonyl hydrazide. The content of the pyrolytic foaming agent can be appropriately set according to the type of foaming agent, the expansion ratio, and the like. From the viewpoint of the expansion ratio, it is 1.5 times or more, preferably about 3 to 7 times, and the pyrolytic 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 pigments, for example, titanium oxide, zinc white, carbon black, black iron oxide, yellow iron oxide, yellow lead, molybdate orange, cadmium yellow, nickel titanium yellow, chromium 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, dibromoanthanthrone, dioxazine, thioindigo, phthalocyanine, indanthrone, halo Organic pigments of emissions phthalocyanine), and 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.

  Moreover, in this invention, the foaming agent containing resin layer may be bridge | crosslinked. As the crosslinking method, a method using ionizing radiation such as an electron beam or a method using a chemical crosslinking agent (organic peroxide, silane compound, etc.) can be adopted as described later.

Non-foamed resin layer The non-foamed resin layer (non-foamed resin layer A) mainly protects the foamed resin layer. In the present invention, a layer formed of a resin composition containing, as a resin component, a polymer obtained using at least one of acrylic acid (CH ₂ ═CHCOOH) and methacrylic acid (CH ₂ ═C (CH ₃ ) COOH) as a monomer. Is a non-foamed resin layer.

  As the resin component, for example, a copolymer obtained by combining at least one of acrylic acid and methacrylic acid with a monomer and ethylene can be suitably used as the resin component. More specifically, it is desirable to use at least one of an ethylene-methacrylic acid copolymer, an ethylene-acrylic acid copolymer, and an ionomer resin. When such a resin component is used, it is possible to form a strong layer particularly due to hydrogen bonds in the resin, so that excellent scratch resistance, abrasion resistance, and the like can be obtained. These may be known or commercially available.

  The content of acrylic acid or methacrylic acid in the copolymer is preferably about 4 to 15% by weight. Such a resin can also use a commercial item. A known additive can also be blended in the resin composition.

  The thickness of the non-foamed resin layer is not limited. In particular, in the first invention, it is preferably 10 μm or less, and more preferably 1 to 10 μm. In the second invention, it is usually preferably about 10 to 50 μm, more preferably about 10 to 20 μm.

  Further, the content of the resin component in the resin composition is not limited, but it is preferably set appropriately within a range of usually 70 to 100% by weight.

  The melt flow rate value of the resin component is not particularly limited. In the first invention, it is generally preferable to be in the range of 10 to 100 g / 10 minutes. In the second invention, it is preferably 100 g / 10 min or more, particularly preferably 100 to 200 g / 10 min.

  In the present invention, it is preferable that at least the non-foamed resin layer is crosslinked. As the crosslinking method, a method using ionizing radiation such as an electron beam or a method using a chemical crosslinking agent (organic peroxide, silane compound, etc.) can be adopted as described later.

Pattern Pattern Layer The foamed wallpaper of the present invention may have a pattern pattern layer on the front surface of the non-foamed resin layer as necessary.

  The pattern layer imparts design properties to the foamed wallpaper. Examples of the 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 base sheet. 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 vehicle, and a solvent 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 vehicle can be set according to the type of the base sheet. For example, acrylic resin, styrene resin, polyester resin, urethane resin, chlorinated polyolefin resin, vinyl chloride-vinyl acetate copolymer resin, polyvinyl butyral resin, alkyd resin, petroleum resin, ketone resin, epoxy Resin, melamine resin, fluorine resin, silicone resin, fiber derivative, rubber resin and the like.

  Examples of the solvent (or dispersion medium) contained in the printing ink include petroleum-based organic solvents such as hexane, heptane, octane, toluene, xylene, ethylbenzene, cyclohexane, and methylcyclohexane; ethyl acetate, butyl acetate, and 2-methoxyacetate. Ester-based organic solvents such as ethyl and 2-ethoxyethyl acetate; alcohol-based organic solvents such as methyl alcohol, ethyl alcohol, normal propyl alcohol, isopropyl alcohol, isobutyl alcohol, ethylene glycol, propylene glycol; acetone, methyl ethyl ketone, methyl isobutyl ketone Ketone organic solvents such as cyclohexanone; ether organic solvents such as diethyl ether, dioxane and tetrahydrofuran; dichloromethane, carbon tetrachloride, trichloroethylene, Chlorinated organic solvents such as tiger chloroethylene; 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.

The embossed invention sheet may be appropriately provided with an embossed pattern in addition to the foamed embossed pattern. In this case, embossing may be performed from the top surface layer of the sheet (on the side opposite to the paper-based substrate). Embossing can be performed by known means such as an embossed plate. For example, when the outermost surface layer is the non-foamed resin layer B, 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.

<Method for producing foam wallpaper>
The manufacturing method of this invention sheet | seat is not specifically limited. For example, co-extrusion with a T-die extruder is suitable. A multi-manifold type T-die capable of simultaneously forming two layers by simultaneously extruding molten resin corresponding to 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 may be prepared, placed on a paper base, and thermally laminated to adhere to the paper base.

  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 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.

  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, i) a non-foamed resin layer / ii) a foaming agent-containing resin layer / iii) a non-foamed resin layer in this order to form a film thickness of 8 μm / 100 μm / 10 μm, A backing paper was laminated on the surface of the iii) layer. The extrusion conditions at this time were as follows: the i) layer resin had a cylinder temperature of 160 ° C., the ii) layer resin had a cylinder temperature of 120 ° C., and the iii) layer resin had a cylinder temperature of 100 ° C. In either case, the die temperature was 120 ° C. Next, after the electron beam (175 KV 3Mrad) was irradiated from above the i) layer to crosslink the ii) layer, the i) layer was subjected to a corona discharge treatment. Furthermore, 2 g / m ² of EVA water-based emulsion was applied as a primer treatment by a gravure printing machine, and a fabric pattern was printed thereon using a water-based ink “Hydric (manufactured by Dainichi Seika Kogyo)” as a pattern print. Next, the foaming agent contained in the foaming agent-containing resin layer was foamed by heating in a gear oven (220 ° C. × 30 seconds). Further, the foam was embossed with a textured pattern to obtain a desired wallpaper.

  Each layer was formed using the following components.

  Non-foamed resin layer i) comprises 100 parts by weight of an ethylene-methacrylic acid copolymer “Nucleel N1110H (MFR = 100): made by Mitsui DuPont Polychemical” and 1 part by weight of a crosslinking agent “OPSTAR JUA-702: made by JSR”. It formed with the resin composition containing.

  The foamed resin layer ii) consists of EVA resin “Evaate CV5053 (MFR = 70, VA = 20%): Sumitomo Chemical” 100 parts by weight, calcium carbonate “Whiteon H: Toyo Fine Chemical” 30 parts by weight, titanium dioxide “R” -108: DuPont "25 parts by weight, Foaming agent" Vinole AC # 3: Eiwa Kasei Kogyo "4 parts by weight, Stabilizer" Adeka Stub OF-102: Asahi Denka Kogyo "5 parts by weight and cross-linking agent" OPSTAR JUA- " 702: JSR "was formed from a resin composition containing 1 part by weight.

  The non-foamed resin layer iii) was formed from EVA resin “Evaate CV5053 (MFR = 70, VA = 20%): manufactured by Sumitomo Chemical”.

Example 2
A composition comprising 100 parts by weight of EMAA (product name “Nucleel N1560”), MFR: 60 g / 10 minutes, methacrylic acid content: 15% by weight, manufactured by Mitsui DuPont Polychemical Co., Ltd. A foamed wallpaper was prepared in the same manner as in Example 1 except that it was prepared.

Example 3
The resin constituting the non-foamed resin layer is 100 parts by weight of EMAA (product name “Nucleel N1110H”, MFR: 100 g / 10 min, methacrylic acid content: 11% by weight, manufactured by Mitsui DuPont Polychemical) and a crosslinking agent (product name) A foamed wallpaper was prepared in the same manner as in Example 1 except that a composition comprising 1 part by weight of “OPSTA JUA-702” (manufactured by JSR) was prepared, and the thickness of the non-foamed resin layer was 15 μm.

Example 4
A composition comprising 100 parts by weight of EMAA (product name “Nucleel N1110H”, MFR: 100 g / 10 min, methacrylic acid content: 11% by weight, manufactured by Mitsui DuPont Polychemical) is prepared as the resin constituting the non-foamed resin layer. Further, a foamed wallpaper was prepared in the same manner as in Example 1 except that the thickness of the non-foamed resin layer was 15 μm.

Example 5
The resin constituting the non-foamed resin layer is 100 parts by weight of EMAA (product name “Nucleel N1110H”, MFR: 100 g / 10 min, methacrylic acid content: 11% by weight, manufactured by Mitsui DuPont Polychemical) and a crosslinking agent (product name) A foam wallpaper was prepared in the same manner as in Example 1 except that a composition consisting of 1 part by weight of “OPSTA JUA-702” (manufactured by JSR Corporation) was prepared.

Comparative Example 1
Prepare a composition comprising 100 parts by weight of EMAA (product name Nucrel N1560), MFR: 60 g / 10 min, methacrylic acid content: 15 wt%, manufactured by Mitsui DuPont Polychemical Co., Ltd. Further, a foamed wallpaper was prepared in the same manner as in Example 1 except that no electron beam was irradiated.

Comparative Example 2
A composition comprising 100 parts by weight of EMAA (product name “Nucleel N1110H”, MFR: 100 g / 10 min, methacrylic acid content: 11% by weight, manufactured by Mitsui DuPont Polychemical) is prepared as the resin constituting the non-foamed resin layer. Then, a foamed wallpaper was produced in the same manner as in Example 1 except that the thickness of the non-foamed resin layer was 15 μm and the electron beam was not irradiated.

Comparative Example 3
A composition comprising 100 parts by weight of EMAA (product name “Nucleel N1110H”, MFR: 100 g / 10 min, methacrylic acid content: 11% by weight, manufactured by Mitsui DuPont Polychemical) is prepared as the resin constituting the non-foamed resin layer. Then, a foamed wallpaper was prepared in the same manner as in Example 1 except that no electron beam was irradiated.

Test Example 1 (Scratch resistance)
A scratch resistance test was performed on the foamed wallpaper produced in the examples and comparative examples.

  The scratch resistance test was conducted in accordance with the “Surface Strengthening Product Performance Labeling Regulations” established by the Japan Vinyl Industry Association Building Subcommittee. That is, the test was performed according to the following procedure.

  First, a test piece (foamed wallpaper) was attached to a Gakushin abrasion tester (JIS L0849 abrasion tester type II). A metal claw designated by the same group was attached as a friction machine of the testing machine, a load of 200 g was applied to the tip of the metal claw, and the test piece was reciprocated five times. Then, scratch resistance was evaluated by confirming the surface state (degree of damage) of the test piece with the naked eye. “Good” means “good” and bad means “good”. This is shown in Table 1 below.

Test example 2 (foamed layer surface appearance)
The surface of the foamed wallpaper produced in the examples and comparative examples was visually observed.
“No bubble removal was confirmed” was evaluated as “◯”, “slight bubble removal was confirmed” as “Δ”, and “bubble removal was confirmed and a large hole was formed on the surface” was evaluated as “x”. This is shown in Table 1 below.

Test example 3 (foam volume)
The foaming volume of the foamed wallpaper produced in Examples and Comparative Examples was measured by the thickness ratio (magnification) before and after foaming. “5 times or more” was evaluated as “◯”, “less than 5 times, 4 times or more” was evaluated as “Δ”, and “less than 4 times” was evaluated as “x”. This is shown in Table 1 below.

Test Example 4 (Embossing suitability)
The embossing aptitude of the foamed wallpaper produced in the examples and comparative examples was measured by measuring the unevenness depth of the embossed plate and the unevenness depth of the wallpaper surface to determine the molding rate. The “molding rate of 60% or more” was evaluated as “◯”, “60-40%” as “Δ”, and “less than 40%” as “×”. This is shown in Table 1 below.

Claims (11)

A foam wallpaper in which at least a foamed resin layer and a non-foamed resin layer are sequentially formed on a paper substrate,
(1) The foamed resin layer is a layer formed by foaming a foaming agent-containing resin layer that is crosslinked by electron beam irradiation ,
(2) The non-foamed resin layer is formed by a resin composition containing at least one polymer of an ethylene-methacrylic acid copolymer, an ethylene-acrylic acid copolymer and an ionomer resin as a resin component, and is crosslinked. Sodea Ru,
Foam wallpaper characterized by that. The foamed wallpaper of Claim 1 whose thickness of the said non-foaming resin layer is 10 micrometers or less. The foamed wallpaper of Claim 1 whose melt flow rate value of the resin component of the said non-foaming resin layer is 100 g / 10min or more. The non-foamed resin layer thickness is not more 10μm or less, and the melt flow rate value of the resin component of the non-foamed resin layer is 100 g / 10 min or more, the foam picture of claim 1. The foamed wallpaper according to any one of claims 1 to 4 , wherein the polymer content of the non-foamed resin layer is 70 to 100% by weight in the resin composition. The foaming agent-containing resin layer is formed from a resin composition containing, as a resin component, at least one ethylene copolymer resin of ethylene-vinyl acetate copolymer resin, ethylene-methyl methacrylate, ethylene-ethyl acrylate, and ethylene-methyl acrylate. The foamed wallpaper according to any one of claims 1 to 5, wherein the resin component has a melt flow rate value of 5 to 75 g / 10 min. The foamed wallpaper according to any one of claims 1 to 6 , wherein the foaming agent-containing resin layer contains a foaming agent, and the foaming agent is a pyrolytic foaming agent. The foaming agent-containing resin layer, an ethylene - vinyl acetate copolymer resin, an inorganic filler, a pigment, and is formed of a resin composition containing a thermally decomposable foaming agent and cell controlling agent, any of claim 1-7 Foam wallpaper according to crab. The foamed wallpaper according to any one of claims 1 to 8, wherein a non-foamed resin layer is further formed between the paper-based substrate and the foamed resin layer. The foamed wallpaper according to any one of claims 1 to 9 , wherein embossing is performed from above the outermost surface layer of the sheet. The decorative sheet for wall covering according to any one of claims 1 to 10 , wherein a crosslinking agent is contained in at least one of the foaming agent-containing resin layer and the non-foaming resin layer.