JP2006283205A - Foamed wall paper having skin layer containing hydrogenated petroleum resin - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide foamed wall paper which can suitably be produced by an extrusion molding method, has the layer of a resin having a large mol.wt. on the front side of the foamed resin layer, and prevents the formation of curls. <P>SOLUTION: This foamed wall paper having a foamed resin layer on a paper substrate is characterized in that (1) a skin layer containing a resin having a mol.wt. of ≥50,000 as a matrix resin is formed on the side opposite to the paper substrate-existing side, on the surface of the foamed resin layer, and (2) the skin layer contains a hydrogenated petroleum resin in an amount of 10 to 35 pts.wt. per 100 pts.wt. of the matrix resin. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a foam wallpaper having a skin layer containing a hydrogenated petroleum resin.

  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.

  It is desirable that the foamed wallpaper has high scratch resistance. Therefore, in order to ensure scratch resistance, conventionally, a resin layer having a high molecular weight (a resin layer having high hardness) is formed on the front surface of the foamed resin layer.

  However, the resin layer having a large molecular weight has a large shrinkage effect due to the crystallization of the resin having a large molecular weight, and the foamed wallpaper tends to curl.

  Moreover, a resin layer having a large molecular weight is not suitable for forming by extrusion molding. This is because a resin having a high molecular weight has a low fluidity (in other words, a low melt flow rate), so that good fluidity cannot be secured in the extrusion molding machine. However, if the extrusion molding can be easily performed, the foamed resin layer and the resin layer having a large molecular weight can be simultaneously molded. Therefore, it is desirable that the extrusion molding can be performed considering the production efficiency of the foam wallpaper.

Therefore, it is desired to develop a foam wallpaper that has a resin layer having a large molecular weight on the front surface of the foamed resin layer and that can be suitably manufactured by extrusion molding, and that suppresses curling.
Japanese Patent Laid-Open No. 6-47875 JP 2000-255011 A JP 2001-347611 A

  An object of the present invention is to provide a foamed wallpaper having a resin layer having a large molecular weight on the front surface of a foamed resin layer, which can be suitably produced by extrusion molding, and curling is suppressed.

  Another object of the present invention is to provide a suitable method for producing the foamed wallpaper including an extrusion molding step.

  As a result of intensive studies, the present inventor has found that the above object can be achieved when a specific resin is allowed to coexist in a resin layer having a large molecular weight, and has completed the present invention.

  That is, this invention relates to the following foam wallpaper and its manufacturing method.

1. A foam wallpaper having a foam resin layer on a paper substrate,
(1) A skin layer using a resin having a molecular weight of 50000 or more as a matrix resin is formed on the surface of the foamed resin layer on the side opposite to the side where the paper-based substrate is present,
(2) The skin layer contains 10 to 35 parts by weight of hydrogenated petroleum resin with respect to 100 parts by weight of the matrix resin.
Foam wallpaper characterized by that.

  2. Item 2. The foamed wallpaper according to Item 1, wherein the matrix resin has a melt flow rate of 2 to 30 g / 10 min.

  3. Item 2. The foamed wallpaper according to Item 1, wherein the matrix resin is a high-density polyethylene resin.

  4). Item 4. The foamed wallpaper according to any one of Items 1 to 3, wherein the resin constituting the foamed resin layer is an ethylene-vinyl acetate copolymer resin.

  5. Item 5. The foamed wallpaper according to any one of Items 1 to 4, further comprising a non-foamed resin layer between the paper substrate and the foamed resin layer.

  6). Item 6. The foamed wallpaper according to Item 5, wherein the resin constituting the non-foamed resin layer is an ethylene-vinyl acetate copolymer resin.

  7). Item 7. The foamed wallpaper according to Item 4 or 6, wherein at least a resin constituting the foamed resin layer is crosslinked.

8). A method for producing a foam wallpaper having a step of forming a skin layer using a resin having a molecular weight of 50000 or more as a matrix resin by extrusion molding,
The composition for forming a skin layer to be subjected to extrusion molding contains a matrix resin having a molecular weight of 50000 or more and 10 to 35 parts by weight of a hydrogenated petroleum resin with respect to 100 parts by weight of the matrix resin.
The manufacturing method characterized by the above-mentioned.

9. Item 9. The production method according to Item 8, wherein the matrix resin has a melt flow rate of 2 to 30 g / 10 min.

Hereinafter, the present invention will be described in detail.

1. Foam wallpaper The foam wallpaper of the present invention is a foam wallpaper having a foam resin layer on a paper substrate,
(1) A skin layer using a resin having a molecular weight of 50000 or more as a matrix resin is formed on the surface of the foamed resin layer on the side opposite to the side where the paper-based substrate is present,
(2) The skin layer contains 10 to 35 parts by weight of hydrogenated petroleum resin with respect to 100 parts by weight of the matrix resin.
It is characterized by that.

  The foamed wallpaper of the present invention is the surface of the foamed resin layer and is opposite to the side on which the paper-based substrate exists (hereinafter, the side opposite to the side on which the paper-based substrate exists is referred to as “front surface”). ) Is formed with a skin layer using a resin having a molecular weight of 50000 or more as a matrix resin.

  By having the skin layer, the foamed wallpaper has good scratch resistance. In view of better scratch resistance, a molecular weight of 100,000 or more is preferable. The upper limit of the molecular weight is preferably about 500,000.

  The melt flow rate (hereinafter abbreviated as “MFR”) of the matrix resin is not limited, but is preferably about 2 to 30 g / 10 minutes, and more preferably about 5 to 20 g / 10 minutes.

  In addition, MFR of this specification is the value measured by the test method of JISK7210 (flow test method of thermoplastics). As test conditions, “190 ° C., 21.18 N (2.16 kgf)” described in JIS K 6760 is adopted.

  As long as it has such characteristics, the type of the matrix resin is not particularly limited, and examples thereof include high-density polyethylene and low-density polyethylene.

  The skin layer contains 10 to 35 parts by weight of hydrogenated petroleum resin with respect to 100 parts by weight of the matrix resin. Among these, 15-20 weight part is preferable. By containing the hydrogenated petroleum resin in such a range, crystallization of the matrix resin can be suppressed even though the molecular weight of the matrix resin is large. Therefore, shrinkage of the skin layer based on crystallization of the resin can be suppressed, and curling of the foam wallpaper can be prevented. Hydrogenated petroleum resins include a partially hydrogenated type and a fully hydrogenated type, but the partially hydrogenated type has a relatively strong polarity. Therefore, considering that the resin is nonpolar, a fully hydrogenated hydrogenated petroleum resin is preferred.

  The structure of the foamed wallpaper of the present invention is not particularly limited as long as the skin layer is provided on the front surface of the foamed wallpaper. Hereinafter, specific configurations of the paper-based substrate, the foamed resin layer, and the foamed wallpaper will be described.

(Paper base material)
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 fibrous 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.

(Foamed resin layer)
The foamed wallpaper of the present invention has a foamed resin layer on a paper-based substrate.

  The resin constituting the foamed resin layer is not limited, but for example, a polyolefin-based resin is suitable.

  Examples of the polyolefin-based resin include polyethylene, polypropylene, polybutene, polymethylpentene, ethylene-propylene copolymer, ethylene-vinyl acetate copolymer, ethylene-acrylic acid copolymer, ethylene-propylene-butene copolymer, Examples thereof include polyolefin-based thermoplastic elastomers. Among these, ethylene-vinyl acetate copolymer resin (EVA) is preferable. EVA has a characteristic of crosslinking by electron beam irradiation.

  When EVA is used, the vinyl acetate content is preferably 10 to 25% by weight. When EVA having a vinyl acetate content within such a range is used, good scratch resistance can be imparted to the foamed wallpaper.

  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 set as appropriate according to the type of foamed wallpaper.

  The foamed resin layer may contain additives such as inorganic fillers, pigments, flame retardants, and heat stabilizers.

  Among these, examples of the inorganic filler include calcium carbonate, aluminum hydroxide, magnesium hydroxide, antimony trioxide, zinc borate, and a molybdenum compound. By including an inorganic filler, an effect of suppressing see-through, an effect of improving surface characteristics, and the like are obtained. The content of the inorganic filler is preferably about 0 to 100 parts by weight and more preferably about 20 to 70 parts by weight with respect to 100 parts by weight of the EVA resin constituting the foamed resin layer.

  Examples of the pigment include the following. Examples of inorganic pigments include titanium oxide, zinc white, carbon black, black iron oxide, yellow iron oxide, yellow lead, molybdate orange, cadmium yellow, nickel titanium yellow, chrome titanium yellow, iron oxide (valve), and cadmium. Examples thereof include red, ultramarine blue, bitumen, cobalt blue, chromium oxide, cobalt green, aluminum powder, bronze powder, titanium mica, and zinc sulfide. Examples of organic pigments include aniline black, perylene black, azo (azo lake, insoluble azo, condensed azo), polycyclic (isoindolinone, isoindoline, quinophthalone, perinone, flavantron, anthrapyrimidine, anthraquinone, quinacridone, Perylene, diketopyrrolopyrrole, dibromoanthanthrone, dioxazine, thioindigo, phthalocyanine, indanthrone, halogenated phthalocyanine) and the like.

  Additives are not limited to those described above, and other known additives can also be used. The amount of addition can be selected from a wide range depending on the type of foam wallpaper.

  Although the thickness of a foamed resin layer is not limited, about 300-1000 micrometers is preferable and about 400-800 micrometers is more preferable.

(Specific composition of foam wallpaper)
The foamed wallpaper of the present invention may have a non-foamed resin layer in addition to the foamed resin layer. For example, a non-foamed resin layer may be further provided between the paper-based substrate and the foamed resin layer. Such a configuration is preferable from the viewpoint of improving the adhesion between the foamed resin layer and the paper-based substrate.

  Although the kind of resin which comprises a non-foaming resin layer is not limited, For example, polyolefin resin can be used like a foaming resin layer. Among these, EVA is preferable. EVA has a characteristic of crosslinking by electron beam irradiation.

  When EVA is adopted as the resin constituting the non-foamed resin layer, the explanation of EVA is the same as the case of the foamed resin layer. In a preferred configuration form of the foamed wallpaper of the present invention, it is preferable that EVA is used as a constituent resin for both the foamed resin layer and the non-foamed resin layer, and at least EVA of the foamed resin layer is crosslinked. Since the hardness is increased by the crosslinking of EVA, it is advantageous for enhancing the scratch resistance.

  Although the thickness of a non-foaming resin layer is not limited, about 0.5-50 micrometers is preferable and about 5-20 micrometers is more preferable.

  The foamed wallpaper of the present invention may have a pattern layer on the front surface of the skin layer.

  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 by, for example, printing a pattern pattern on the front surface of the resin layer in the above structure example. Examples of printing methods include gravure printing, flexographic printing, silk screen printing, and offset printing. As the printing ink, a known printing ink containing a colorant, a vehicle, and a solvent can be used.

  The pigment can be used as the colorant.

  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 Examples include butyral resins, alkyd resins, petroleum resins, ketone resins, epoxy resins, melamine resins, fluorine resins, silicone resins, fiber derivatives, and rubber resins.

  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; water and the like.

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

  The foamed wallpaper of the present invention may further have an arbitrary embossed pattern on the front surface in addition to the foamed uneven pattern based on having the foamed resin layer.

  The embossed pattern can be given by, for example, a known embossed plate. For example, an arbitrary embossed pattern can be formed on the foam wallpaper by pressing the embossed plate while heating from the surface of the resin layer. 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. Method for producing foamed wallpaper The method for producing the foamed wallpaper of the present invention is not particularly limited.
The composition for forming a skin layer to be subjected to extrusion molding contains a matrix resin having a molecular weight of 50000 or more and 10 to 35 parts by weight of a hydrogenated petroleum resin with respect to 100 parts by weight of the matrix resin.
It can manufacture suitably by the manufacturing method characterized by this.

  The manufacturing method includes a step of forming a skin layer using a resin having a molecular weight of 50000 or more as a matrix resin by extrusion molding. The extrusion molding method is not particularly limited, and examples thereof include a method of extruding the skin layer forming composition with a T-die extruder. The extrusion temperature can be appropriately set within a temperature range equal to or higher than the melting temperature of the resin component contained in the composition. Specifically, a cylinder temperature of about 120 to 180 ° C. and a die temperature of about 120 to 140 ° C. are preferable.

  The composition for forming a skin layer is a mixture containing the matrix resin and a hydrogenated petroleum resin. The content of the hydrogenated petroleum resin is about 10 to 35 parts by weight, preferably about 15 to 20 parts by weight with respect to 100 parts by weight of the matrix resin. By containing a hydrogenated petroleum resin in such a range, good fluidity can be ensured during extrusion despite the composition having a resin having a molecular weight of 50000 or more as a matrix. Specifically, even if the resin has an MFR of 2 to 30 g / 10 min, good fluidity can be secured at the time of extrusion, so that it can be easily extruded.

  Next, a preferred method for producing a foam wallpaper in which a non-foamed resin layer, a foamed resin layer, and a skin layer are sequentially formed on a paper-based substrate will be exemplified. In this example, EVA, which is a suitable resin, is used as the resin constituting the non-foamed resin layer and the foamed resin layer.

  Thus, in the case of a foamed wallpaper having a structure in which a plurality of (three layers) resin layers are laminated, simultaneous extrusion formation using a T-die extruder can be suitably used. Specifically, the composition for forming an unfoamed resin layer containing an EVA melt, the composition for forming an unfoamed resin layer containing a pyrolytic foaming agent, and the composition for forming the skin layer are contained in separate cylinders. However, three layers can be simultaneously laminated by coextrusion molding. As needed, a known additive can be included in each composition.

  EVA contained in the non-foamed resin layer-forming composition and the non-foamed resin layer-forming composition preferably has an MFR of about 40 to 75 g / 10 minutes in consideration of extrusion moldability.

  Examples of the thermally decomposable foaming agent include azo series such as azodicarbonamide (ADCA) and azobisformamide; and hydrazide series 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. As for content of a foaming agent, about 1-20 weight part is preferable with respect to 100 weight part of EVA contained in the composition for non-foamed resin layer formation.

  The composition for forming an unfoamed resin layer may contain an inorganic filler. The inorganic filler is as described above. In addition, a foam cell regulator, a heat stabilizer, a flame retardant, and the like can be blended. About these compounding quantities, it can set suitably according to the kind of foam wallpaper.

  The three-layer laminate formed by the extrusion molding may be directly extruded onto a paper-based substrate, or may be formed separately from the paper-based substrate. In the former case, since the resin layer has good adhesiveness due to heat of fusion, it is in close contact with the paper substrate. In the case of the latter, it can adhere | attach by mounting a laminated body on a paper-like base material, and carrying out heat lamination.

  After forming a laminated body on a paper-like base material, an unfoamed resin layer is made into a foamed resin layer by heating a foaming agent.

  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 180 to 240 ° C, more preferably about 210 to 230 ° C. The heating time is preferably about 20 to 60 seconds, and more preferably about 25 to 40 seconds.

  Before the heat treatment, the resin layer may be irradiated with an electron beam. Thereby, since EVA can be bridge | crosslinked, the foaming degree 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.

  When performing electron beam irradiation, the composition may contain a crosslinking aid.

  Any crosslinking assistant may be used as long as it promotes crosslinking by electron beam irradiation. Examples thereof include polyfunctional monomers such as neopentyl glycol dimethacrylate and trimethylolpropane trimethacrylate, oligomers, and the like. The crosslinking aid is preferably about 0 to 10 parts by weight and more preferably 1 to 4 parts by weight with respect to 100 parts by weight of EVA.

  When producing a foam wallpaper having a pattern layer, it may be formed on the front surface of the skin layer before heating. The specific method for forming the pattern layer is as described above.

  What is necessary is just to shape by pressing a well-known embossing plate from the front surface of a foam wallpaper, when embossing a pattern.

  In the foamed wallpaper of the present invention, the skin layer contains 10 to 35 parts by weight of hydrogenated petroleum resin with respect to 100 parts by weight of the matrix resin. By containing the hydrogenated petroleum resin in such a range, crystallization of the matrix resin can be suppressed even though the molecular weight of the matrix resin is large. Therefore, shrinkage of the skin layer based on crystallization of the resin can be suppressed, and curling of the foam wallpaper can be prevented. Moreover, since the matrix resin has a large molecular weight, it can impart good scratch resistance to the foamed wallpaper.

  The method for producing foamed wallpaper of the present invention is such that the composition for forming a skin layer contains a specific amount of hydrogenated petroleum resin, so that the resin at the time of extrusion molding is used even though the molecular weight of the matrix resin contained in the composition is large. Good fluidity.

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

Example 1
In order to form a non-foamed resin layer, EVA (product name “Evalate CV5053”, MFR: 70 g / 10 min, vinyl acetate content: 20 wt%, manufactured by Sumitomo Chemical Co., Ltd.) was prepared.

  In order to form a skin layer (hydrogenated petroleum resin-containing layer), a composition containing the components shown in Table 1 below was prepared.

  In order to form an unfoamed resin layer, a composition containing the components described in Table 2 below was prepared.

  The resin and the resin-containing composition were melted, and three layers were coextruded and laminated on a paper substrate (basis weight 70 g) having a thickness of 110 μm using a three-type three-layer multi-manifold T-die extruder. In the T-die extruder, the temperature of the extrusion cylinder for the skin layer was set to 150 ° C., the extrusion cylinder for the unfoamed layer and the non-foamed layer was set to 120 ° C., and the die temperature was set to 120 ° C.

  In the coextrusion lamination, the non-foamed resin layer / non-foamed resin layer / skin layer were laminated in this order so that the paper base and the non-foamed resin layer were in contact with each other. The thickness of each layer was 15 μm / 100 μm / 10 μm in the above order.

  After lamination, electron beams (175 kV, 5 Mrad) were irradiated from above the skin layer to crosslink the resin, and the front surface of the skin layer was subjected to corona discharge treatment.

Next, 2 g / m ² of EVA water-based emulsion was applied to the front surface of the skin layer to form a primer layer, and then a pattern print layer having a texture pattern was formed by gravure printing. A water-based ink (product name “Hydric” manufactured by Dainichi Seika Kogyo Co., Ltd.) was used as the printing ink.

  Next, the laminate was heated at 220 ° C. for 30 seconds in a gear oven. As a result, the thermally decomposable foaming agent was decomposed, and the unfoamed resin layer was used as the foamed resin layer.

  Next, the foam was embossed from the front surface of the skin layer to form a textured pattern.

  Through the above process, a foam wallpaper was produced.

Comparative Example 1
A foamed wallpaper was prepared in the same manner as in Example 1 except that the content of the hydrogenated petroleum resin was 50 parts by weight.

Comparative Example 2
A foam wallpaper was prepared in the same manner as in Example 1 except that the content of the hydrogenated petroleum resin was changed to 5 parts by weight.

Test example 1 (extrusion processability)
In Examples and Comparative Examples, the extrudability when three layers were simultaneously laminated was evaluated.

  The film-forming cross section was observed with a microscope, and a case where the three layers were uniformly formed in the width direction was evaluated as “good”, and a non-uniform one was evaluated as “poor”.

Test Example 2 (Curl resistance)
The curl resistance of the foamed wallpaper produced in Examples and Comparative Examples was evaluated.

  The case where curling could not be confirmed with the naked eye was evaluated as ◯. Moreover, the thing which can confirm curl with the naked eye was evaluated as x.

Test Example 3 (Scratch resistance)
The scratch resistance of the foamed wallpaper produced in the examples and comparative examples was evaluated.

  The tests and evaluations were conducted in accordance with the “Surface-enhanced wallpaper performance regulations” established by the Japan Vinyl Industry Association Vinyl Construction Committee. Specifically, tests and evaluations were performed according to the following procedures.

  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 the sample was reciprocated five 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: There are five stages in which the surface is torn and the backing material such as paper can be seen (length is 1 cm or more).

  In Test Example 3, those corresponding to the above grades 5 to 4 were evaluated as ◯, those corresponding to the third grade were evaluated as Δ, and those corresponding to the 2nd to 1st grades were evaluated as ×.

  The results of the above test are shown in Table 3 below.

Claims (9)

A foam wallpaper having a foam resin layer on a paper substrate,
(1) A skin layer using a resin having a molecular weight of 50000 or more as a matrix resin is formed on the surface of the foamed resin layer on the side opposite to the side where the paper-based substrate is present,
(2) The skin layer contains 10 to 35 parts by weight of hydrogenated petroleum resin with respect to 100 parts by weight of the matrix resin.
Foam wallpaper characterized by that.   The foamed wallpaper of Claim 1 whose melt flow rate of the said matrix resin is 2-30 g / 10min.   The foamed wallpaper according to claim 1, wherein the matrix resin is a high-density polyethylene resin.   The foamed wallpaper according to any one of claims 1 to 3, wherein the resin constituting the foamed resin layer is an ethylene-vinyl acetate copolymer resin.   The foamed wallpaper according to any one of claims 1 to 4, further comprising a non-foamed resin layer between the paper substrate and the foamed resin layer.   The foamed wallpaper according to claim 5, wherein the resin constituting the non-foamed resin layer is an ethylene-vinyl acetate copolymer resin.   The foamed wallpaper according to claim 4 or 6, wherein at least a resin constituting the foamed resin layer is crosslinked. A method for producing a foam wallpaper having a step of forming a skin layer using a resin having a molecular weight of 50000 or more as a matrix resin by extrusion molding,
The composition for forming a skin layer to be subjected to extrusion molding contains a matrix resin having a molecular weight of 50000 or more and 10 to 35 parts by weight of a hydrogenated petroleum resin with respect to 100 parts by weight of the matrix resin.
The manufacturing method characterized by the above-mentioned.   The manufacturing method of Claim 8 whose melt flow rate of the said matrix resin is 2-30 g / 10min.