JP2006097212A - Wallpaper - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide wallpaper having high surface strength and good in processability. <P>SOLUTION: The wallpaper is such that foamed polyolefin resin layer is laminated on fibrous substrate sheet. The wallpaper is characterized by that (1) the foamed polyolefin resin layer is formed of a resin composition comprising (1) at least one resin selected from an ethylene-vinyl acetate copolymer and an ethylene-methyl methacrylate copolymer, (2) a foaming agent and (3) a crosslinking auxiliary, (2) the storage modulus and the tanδ of the foamed layer are 1,600-18,000 MPa and 0.8-2.0 respectively at 200-240°C and (3) the loss modulus and the tanδ of the foamed layer are 1,600-18,000 MPa and 0.8-2.0 respectively at 200-240°C. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a wallpaper that is suitably used as an interior material of a building, particularly as a wall covering material.

  Conventionally, so-called vinyl chloride wallpaper in which a vinyl chloride resin is formed on a paper base material has been widely used as wallpaper used for interior materials of buildings. However, in recent years, a decorative sheet not using vinyl chloride has been considered, and a decorative sheet using foamed polyolefin has been proposed.

  These are prepared by melt extrusion coating a polyolefin resin mixed with a foaming agent on a printed substrate sheet, or by sheeting separately by a T-die extrusion method, and then using dry lamination or thermal lamination. The method of sticking to the material sheet is taken.

  However, the wallpaper having the polyolefin foam layer described above generally has low surface strength. Therefore, in order to reinforce the surface strength, it is necessary to laminate a polypropylene film, a polyethylene film, or the like on the foam layer, or separately perform a coating treatment with an acrylic emulsion or the like.

On the other hand, a method for improving the surface strength without separately applying the above-described reinforcement is known. This is a method of crosslinking by irradiating an electron beam to a polyolefin resin layer such as polypropylene (Patent Document 1).
JP-A-10-193538

  However, all of the above-mentioned methods are considered to be good in cross-linking foaming as long as they are olefin-based, but this is not the case. In that respect, further improvement is required for the type and physical properties of the resin.

  Further, in the example of the above-mentioned Patent Document 1, although the surface strength can be improved, another problem arises. That is, a curling phenomenon occurs at the stage of the original laminate of the paper / extruded resin layer, making it difficult to perform printing or the like. In particular, it is impossible to perform overpainting of two or more colors.

  Moreover, after being commercialized as wallpaper (no color printing, one color printing product), the expansion of the foamed resin layer does not follow the elongation of the paper that occurs during construction, and the edges of the wallpaper may warp after being applied to the wall surface. is there.

  Therefore, the main object of the present invention is to provide a wallpaper having excellent surface strength and good processability.

  As a result of intensive studies to solve the above problems, the present inventor has found that the above object can be achieved by forming a foam layer having specific physical properties, and has completed the present invention. It was.

  That is, the present invention relates to the following wallpaper.

1. A wallpaper in which a polyolefin resin foam layer is laminated on a fibrous base sheet,
(1) The foam layer is formed of a resin composition comprising 1) at least one of an ethylene-vinyl acetate copolymer and an ethylene-methyl methacrylate copolymer, 2) a foaming agent, and 3) a crosslinking aid. And
(2) The storage elastic modulus and Tan δ at 200 to 240 ° C. of the foam layer are 1600 to 18000 Mpa and 0.8 to 2.0, respectively.
(3) The loss elastic modulus and Tan δ at 200 to 240 ° C. of the foam layer are 1600 to 18000 Mpa and 0.8 to 2.0, respectively.
A wallpaper characterized by that.

  2. Item 2. The wallpaper according to Item 1, wherein a part or all of the crosslinking aid is an acrylic monomer.

  3. Item 2. The wallpaper according to Item 1, wherein the vinyl acetate component of the ethylene-vinyl acetate copolymer is 15 to 30% by weight.

  4). Item 2. The wallpaper according to Item 1, wherein the methyl methacrylate component of the ethylene-methyl methacrylate copolymer is 15 to 30% by weight.

  According to the wallpaper of this invention, since it has the polyolefin-type resin foam layer which has a specific physical property, favorable workability can be exhibited with the outstanding surface strength.

The wallpaper of the present invention is a wallpaper in which a polyolefin resin foam layer is laminated on a fibrous base sheet,
(1) The foam layer is formed of a resin composition comprising 1) at least one of an ethylene-vinyl acetate copolymer and an ethylene-methyl methacrylate copolymer, 2) a foaming agent, and 3) a crosslinking aid. And
(2) The storage elastic modulus and Tan δ at 200 to 240 ° C. of the foam layer are 1600 to 18000 Mpa and 0.8 to 2.0, respectively.
(3) The loss elastic modulus and Tan δ at 200 to 240 ° C. of the foam layer are 1600 to 18000 Mpa and 0.8 to 2.0, respectively.
It is characterized by that.

  As the fibrous base sheet, for example, paper, non-woven fabric, woven fabric or the like is used. The paper may be either flame retardant paper or general paper.

  The flame retardant paper is a paper containing the following flame retardant in the paper. Examples of the flame retardant include a nitrogen compound such as urea and an ammonium compound, a hydroxide (preferably a hydrate) such as magnesium hydroxide and aluminum hydroxide, and a flame retardant containing a self-extinguishing phosphorus or halogen element. Is suitable. In particular, by blending a compound containing water of crystallization such as magnesium hydroxide, flame retardancy can be suitably achieved by the heat of vaporization of the water of crystallization during combustion decomposition.

  Examples of the nonwoven fabric include a wet nonwoven fabric and a dry nonwoven fabric. As a wet nonwoven fabric, for example, there is a papermaking type. Examples of the dry nonwoven fabric include an adhesive type, a mechanical bond type (needle punch, stitch bond), and a spun bond type. More specifically, rayon paper, a mixture of pulp, Japanese paper, glass nonwoven fabric, asbestos nonwoven fabric, polyester nonwoven fabric, or the like is used as the nonwoven fabric.

The polyolefin resin foam layer
(1) The foam layer is formed of a resin composition comprising 1) at least one of an ethylene-vinyl acetate copolymer and an ethylene-methyl methacrylate copolymer, 2) a foaming agent, and 3) a crosslinking aid. And
(2) The storage elastic modulus and Tan δ at 200 to 240 ° C. of the foam layer are 1600 to 18000 Mpa and 0.8 to 2.0, respectively.
(3) The loss elastic modulus and Tan δ at 200 to 240 ° C. of the foam layer are 1600 to 18000 Mpa and 0.8 to 2.0, respectively.

  By satisfying these requirements (1) to (3), good workability can be exhibited while maintaining excellent surface strength. In other words, if any of the above requirements is not met, the surface strength is reduced, or the curling phenomenon as described above occurs, which hinders subsequent processing.

  The polyolefin resin as the main component of the foam layer is at least one of ethylene-vinyl acetate copolymer (EVA) and ethylene-methyl methacrylate copolymer (EMMA). As EVA, the vinyl acetate component is desirably 15 to 30% by weight. Moreover, as EMMA, it is desirable that the methyl methacrylate component is 15 to 30% by weight. By setting to such a range, it is possible to achieve better surface strength.

  In addition, the said foam layer may contain other resin in the range which does not prevent the effect of this invention.

  The foam layer of the present invention is not particularly limited in the expansion ratio, but it is usually only about 3 to 7 times. If it is the said range, desired surface strength, workability, etc. can be obtained more reliably.

  The foam layer of the present invention may be subjected to a decoration treatment as necessary. For example, a known decoration process such as embossing can be used.

  The wallpaper composition of the present invention basically has a polyolefin resin foam layer laminated on a fibrous base material, but other layers (adhesion) within the range not impeding the effects of the present invention. Agent layer, primer layer, etc.) may be included.

Wallpaper Production Method The wallpaper production method of the present invention is not limited as long as a foam layer having the above-described characteristics can be formed. For example, the wallpaper of the present invention can be suitably produced by a production method including a step of forming a foam layer with a resin composition containing a polyolefin resin, a foaming agent and a crosslinking aid.

  As the polyolefin-based resin of the resin composition, one or two or more of those shown above can be used.

  A well-known or commercially available foaming agent can be used. For example, azo compounds such as azodicarbonamide and azobisisobutyronitrile; sulfonyl hydrazide compounds such as paratoluenesulfonyl hydrazide and oxybisbenzenesulfonyl hydrazide; nitroso compounds such as N, N′-dinitrosopentamethylenetetramine; A pyrolytic foaming agent such as ammonium carbonate, sodium boron hydride, potassium hydrogen carbonate, sodium hydrogen carbonate, or the like can be used. These can be used alone or in combination of two or more.

  The addition amount of the foaming agent may be appropriately set depending on the type of foaming agent to be used, the foaming method, and the like.

  Moreover, a foaming accelerator can be added with a foaming agent as needed. The foaming accelerator may be a substance that promotes the thermal decomposition and gas generation reaction of the pyrolytic foaming agent to be used. For example, when an azo compound such as azodicarbonamide is used as a foaming agent, dibasic lead sulfate, tribasic lead sulfate, tribasic lead maleate, dibasic lead phthalate, stearic acid are used as foaming accelerators. At least one of lead, zinc white, urea, oxalic acid, ethanolamine and the like can be used. When N, N'-dinitrosopentamethylenetetramine is used as the foaming agent, at least one oxalic acid, salicylic acid, phthalic anhydride, urea, ethylene glycol, boric acid, benzoic acid or the like is used as the foaming accelerator. Can do.

  The crosslinking aid may be any one that crosslinks the polyolefin resin, and may be appropriately selected according to the type of the polyolefin resin to be used. In the present invention, an acrylic monomer or the like can be particularly preferably used.

  The addition amount of the crosslinking aid can be appropriately set according to the kind of the crosslinking aid to be used, the characteristics of the desired foam layer, etc., but usually 0.1 to 10 parts by weight with respect to 100 parts by weight of the polyolefin resin. In particular, it is desirable to be 1 to 3 parts by weight.

  In addition, an additive can be mix | blended with the said resin composition as needed. For example, an inorganic filler can be added to give an increase effect, or a flame retardant can be added to make a foam layer imparted with flame retardancy.

  Examples of the inorganic filler include powders (particles) such as calcium carbonate, barium sulfate, clay and talc, and inorganic hollow bodies such as mica, silica, alumina, diatomaceous earth, silica sand, and shirasu balloon.

  Suitable flame retardants include, for example, nitrogen compounds such as urea, hydroxides such as magnesium hydroxide and aluminum hydroxide (particularly compounds having crystal water), flame retardants containing self-extinguishing phosphorus or halogen elements, and the like. Yes. In particular, by blending a compound such as a hydroxide, flame retardancy can be achieved by the heat of vaporization of crystal water during combustion decomposition. Further, it is preferable that 25 to 100 parts by weight of a mixed flame retardant compound composed of a nitrogen compound and a phosphorus compound is blended in the polyolefin resin. This is because the compatibility with polyolefin is good and the thermal stability is also good.

  When the polyolefin resin foam layer is formed on the fibrous base material, the kneaded product can be used according to a known lamination method or the like. For example, any of an extrusion method using a T die, a calendar processing method, a dry lamination method using an adhesive, and the like can be employed.

  The formed foam layer (before foaming) is preferably subjected to treatment with ionizing radiation or the like (crosslinking treatment) prior to foaming. For example, an unfoamed resin layer that forms a foam in a later step by forming a layer of the resin composition on a fibrous base sheet and irradiating it with ionizing radiation such as an electron beam to crosslink. Change material properties. Thereby, a foamed resin layer having a predetermined surface strength can be obtained.

  The ionizing radiation means an electromagnetic wave or a charged particle beam having an energy quantum capable of polymerizing / crosslinking molecules, and usually ultraviolet rays, electron beams and the like are used. As the ultraviolet light source, for example, a light source such as an ultrahigh pressure mercury lamp, a high pressure mercury lamp, a low pressure mercury lamp, a carbon arc, a black light lamp, or a metal halide lamp can be used. As the electron beam source, for example, various electron beam accelerators such as a Cockloft Walton type, a bandegraph type, a resonant transformer type, an insulated core transformer type, a linear type, a dynamitron type, and a high frequency type may be used. The intensity is usually about 50 to 300 keV, preferably 100 to 200 keV.

  Next, a foaming process is performed to form a predetermined foam layer. The method of foaming treatment is not particularly limited, and may be a method that is adopted for known wallpaper. For example, it can be carried out by heating the layer before foaming at about 200 to 300 ° C.

  Hereinafter, preferred embodiments of the present invention will be described in more detail with reference to the drawings. FIG. 1 is a cross-sectional view showing an embodiment of wallpaper 4 according to the present invention, in which 1 is a pattern, 2 is a foam layer, 3 is a fibrous base sheet, and 4 is wallpaper.

  As the wallpaper 4, there are various types other than those shown in FIG. 1. For example, in the wallpaper 15 as shown in FIG. 2, an embossed foam layer 13 is laminated on a fibrous base material sheet 14, the wiping ink 12 is present in the embossed concave portion, and the wood grain pattern 11 is present in the convex portion. The whole is covered with a protective layer 10.

  When decorating, it is possible to print a pattern directly on the surface of the foam layer as shown in FIG. 1, but in order to make the adhesive force between the ink and the foam layer stronger. The surface of the foam layer is preferably subjected to an easy adhesion treatment such as application of an easy adhesion layer, corona discharge treatment, or plasma treatment.

  As the easy adhesion layer (also referred to as a primer layer or an anchor layer), for example, acrylic, vinyl chloride-vinyl acetate copolymer, polyester, polyurethane, chlorinated polypropylene, chlorinated polyethylene and the like can be used. In particular, acrylic, chlorinated polypropylene and the like are desirable.

  Examples of acrylic include poly (meth) methyl acrylate, poly (meth) ethyl acrylate, poly (meth) propyl acrylate, poly (meth) butyl acrylate, methyl (meth) acrylate / butyl (meth) acrylate Copolymer, (Meth) acrylic such as ethyl (meth) acrylate / butyl (meth) acrylate copolymer, ethylene / methyl (meth) acrylate copolymer, styrene / methyl (meth) acrylate copolymer It is the acrylic resin which consists of a homo- or copolymer containing an acid ester. However, (meth) acryl means acryl or methacryl, and so on.

  Polyurethane is a composition having a polyol (polyhydric alcohol) as a main component and an isocyanate as a crosslinking aid (curing agent).

  As the polyol, one having two or more hydroxyl groups in the molecule, for example, polyethylene glycol, polypropylene glycol, acrylic polyol, polyester polyol, polyether polyol and the like are used.

  As the isocyanate, a polyvalent isocyanate having two or more isocyanate groups in the molecule is used. For example, aromatic isocyanate such as 2-4 tolylene diisocyanate, xylene diisocyanate, 4-4 diphenylmethane diisocyanate, or aliphatic (or alicyclic) such as hexamethylene diisocyanate, isophorone diisocyanate, hydrogenated tolylene diisocyanate, hydrogenated diphenylmethane diisocyanate. Group) isocyanates are used.

  Examples of the method of performing the decoration treatment on the wallpaper 4 of the present invention include a method of adding a pigment to the foam layer 2 to give transparent coloring or opaque coloring.

  As the pigment, known or commercially available pigments can be used. For example, titanium white, zinc white, petal, vermilion, ultramarine, cobalt blue, titanium yellow, yellow lead, carbon black and other inorganic pigments; isoindolinone, Hansa Yellow A, quinacridone, permanent red 4R, phthalocyanine blue, indanthrene Organic pigments (including dyes) such as Brie RS and aniline black; metal pigments such as aluminum and brass; nacreous (pearl) pigments made of foil powder such as titanium dioxide-coated mica and basic lead carbonate. These can select either a transparent colored pigment or an opaque colored pigment depending on the application. These pigments may be added and dispersed as powder or scaly foil pieces.

  Moreover, as another method of performing the decoration process on the wallpaper 4 of the present invention, for example, a method of providing a decorative layer (pattern 1, wood grain pattern 11) on the foam layer as shown in FIG. 1 or FIG. The decoration layer can be formed by laminating a printing layer, a metal thin film, or the like. As the printing method, for example, a known printing method such as gravure printing, offset printing, silk screen printing, or transfer printing from a transfer sheet may be used to form the pattern 1 with ink (or paint).

  Examples of the pattern 1 (pattern) include a wood pattern, a stone pattern, a cloth pattern, a leather pattern, a geometric figure, a character, a symbol, and the like, or a solid surface. The pattern can be provided on the front surface, back surface, both front and back surfaces, and the interlayer of the foam layer.

  For the decorative layer ink (including the wiping ink 12 in FIG. 2) or paint, the binder (vehicle) is chlorinated polyethylene such as chlorinated polyethylene and chlorinated polypropylene, polyester, polyurethane, acrylic, vinyl acetate, vinyl chloride, A vinyl acetate copolymer, a cellulose resin, or the like can be used. These can be used alone or in combination. What added the well-known pigment as enumerated above may be used for this. The protective layer 10 of FIG. 2 is the same component as the ink of the decorative layer not containing a pigment.

  As shown in FIG. 1, when printing directly on the foam layer, acrylic, chlorinated polyolefin, polyurethane and the like are preferable as a binder from the viewpoint of adhesiveness. Adequate adhesiveness can also be obtained using the above binder.

  In the case where the decoration layer is formed of a metal thin film, a method of laminating the metal thin film entirely or partially in a pattern can be mentioned. The metal thin film is formed by a method such as vacuum deposition or sputtering using a metal such as aluminum, chromium, gold, silver, or copper. Or a combination of these may be used. The metal thin film may be provided on the entire surface, or may be provided partially in a pattern.

  The decorative layer may be a gloss adjusting layer. The gloss adjusting layer gives a desired gloss to the surface of the foam layer, and can be formed by applying a paint using an appropriate vehicle. The vehicle is the same as that of the ink used for the decorative layer. As the paint for forming the gloss adjusting layer, a gloss (gloss) type paint which does not contain any matting agent is sometimes used, although an appropriate amount of matting agent is usually dispersed to give a desired matting degree. Examples of the matting agent that can be used include inorganic hollow bodies such as mica, silica, alumina, calcium carbonate, diatomaceous earth, silica sand, and shirasu balloon.

  In order to give better weather resistance (light resistance) in the wallpaper 4 of the present invention, an ultraviolet absorber and / or a light stabilizer is added to the foam layer or its protective layer as necessary. The addition amount is usually about 0.5 to 10% by weight for both the ultraviolet absorber and the light stabilizer, but it is generally preferable to use the ultraviolet absorber and the light stabilizer in combination.

  As the ultraviolet absorber, for example, organic substances such as benzotriazole, benzophenone, and salicylic acid ester, or inorganic substances such as fine particles of zinc oxide, cerium oxide, and titanium oxide having a diameter of 0.2 μm or less can be used. As the light stabilizer, a radical scavenger such as a hindered amine radical scavenger such as bis- (2,2,6,6-tetramethyl-4-piperidinyl) sebacate or a piperidine radical scavenger can be used.

  The adherend for attaching the wallpaper 4 is not particularly limited. For example, plasterboard, pearlite board, flat plate such as jar, door, plate material such as curved plate, and various shaped articles such as three-dimensional shaped articles (molded articles). Is the target.

  As a method of laminating these various adherends, for example, 1) a method of laminating the adherend with a pressure roller with an adhesive layer interposed therebetween, 2) a wallpaper 4 on the surface of the adherend A so-called vacuum press laminating method in which the wallpaper 4 is laminated on the surface of the molded product by pressure difference due to vacuum suction from the adherend (molded product) side, 3) a cylinder, The wall paper 4 is supplied to a column such as a polygonal column via an adhesive layer, and the wall paper 4 is sequentially pressed and adhered to a plurality of side surfaces constituting a columnar body by a plurality of rollers having different directions. There are so-called lapping methods.

  In particular, as a method of attaching the wallpaper 4 to the uneven three-dimensional object, the lapping method is preferable among the above methods.

  The wallpaper 4 of the present invention is subjected to predetermined molding processing and the like and used for various purposes. For example, interior decoration of buildings such as walls, ceilings, floors, surface decorations of furniture such as window frames, doors, handrails, surface decorations of furniture or cabinets of light electrical / OA equipment, vehicle interiors of automobiles, trains, aircraft interiors, windows Uses such as glass makeup are listed.

  Hereinafter, examples and comparative examples will be shown to further clarify the features of the present invention. However, the scope of the present invention is not limited to the examples.

Example 1
As a resin composition for forming a foam layer, ethylene-acetic acid copolymer (Sumitomo Chemical "5053", MFR70, VA20) 100 parts by weight, calcium carbonate (Shiraishi Kogyo "Whiteon H") 10 parts by weight, Titanium (DuPont “R108”) 20 parts by weight, Cell regulator (Adeka “OF101”) 5 parts by weight, Foaming agent (Yewa Kasei “ADCA # 3”) 3 parts by weight, Foaming agent (Yewa Kasei “OBSH” # 5000 ") and 1 part by weight of a crosslinking aid (manufactured by JSR, acrylic monomer) were used.

  The kneaded product was heated to 120 ° C. and laminated on a fine paper (fibrous substrate sheet) in a non-foamed state by T-die extrusion. Next, the electron beam was irradiated from this resin layer side (175 kv, 5 Mrad). And on the surface of this resin layer, after carrying out a gravure pattern printing by gravure printing method using acrylic-based ink (manufactured by Dainichi Seika), heating at 230 ° C for 30 seconds in a heating furnace, The foam layer was formed by foaming the resin layer 5 times.

Example 2
As a resin composition for forming a foam layer, ethylene-acetic acid copolymer (“634” manufactured by Tosoh, MFR4.3, VA26) 100 parts by weight, calcium carbonate (“Whiten H” manufactured by Shiroishi Kogyo) 10 parts by weight, 20 parts by weight of titanium dioxide (“D108” manufactured by DuPont), 5 parts by weight of a cell conditioner (“OF101” manufactured by Adeka), 3 parts by weight of a foaming agent (“ADCA # 3” manufactured by Eiwa Kasei) and a foaming agent (“Ewaka Chemical” OBSH # 5000 ") A kneaded mixture containing 1 part by weight was used.

  The kneaded product was laminated on a high-quality paper (fibrous substrate sheet) in a non-foamed state by calendaring. Next, an electron beam was irradiated from the resin layer side (175 kv, 3 Mrad). And on the surface of this resin layer, after carrying out a gravure pattern printing by gravure printing method using acrylic-based ink (manufactured by Dainichi Seika), heating at 230 ° C for 30 seconds in a heating furnace, The foam layer was formed by foaming the resin layer 5 times.

Comparative Example 1
As a resin composition for forming a foam layer, ethylene-acetic acid copolymer (Sumitomo Chemical "5053", MFR70, VA20) 100 parts by weight, calcium carbonate (Shiraishi Kogyo "Whiteon H") 10 parts by weight, 20 parts by weight of titanium (“R108” manufactured by DuPont), 5 parts by weight of a cell conditioner (“OF101” manufactured by Adeka), 3 parts by weight of a foaming agent (“ADCA # 3” manufactured by Eiwa Kasei) and a foaming agent (“OBSH manufactured by Eiwa Kasei) # 5000 ") 1 part by weight of the kneaded material was used.

  The kneaded product was heated to 120 ° C. and laminated on a fine paper (fibrous substrate sheet) in a non-foamed state by T-die extrusion. Next, the electron beam was irradiated from this resin layer side (175 kv, 5 Mrad). And on the surface of this resin layer, after carrying out a gravure pattern printing by gravure printing method using acrylic-based ink (manufactured by Dainichi Seika), heating at 230 ° C for 30 seconds in a heating furnace, The foam layer was formed by foaming the resin layer 6 times.

Comparative Example 2
As a resin composition for forming a foam layer, ethylene-acetic acid copolymer (“634” manufactured by Tosoh, MFR4.3, VA26) 100 parts by weight, calcium carbonate (“Whiten H” manufactured by Shiroishi Kogyo) 10 parts by weight, 20 parts by weight of titanium dioxide (“D108” manufactured by DuPont), 5 parts by weight of a cell conditioner (“OF101” manufactured by Adeka), 3 parts by weight of a foaming agent (“ADCA # 3” manufactured by Eiwa Kasei) and a foaming agent (“Ewaka Chemical” OBSH # 5000 ") A kneaded mixture containing 1 part by weight was used.

  The kneaded product was laminated on a high-quality paper (fibrous substrate sheet) in a non-foamed state by calendaring. Next, without performing electron beam irradiation, the surface of this resin layer was printed with a gravure pattern printing method using an acrylic ink (manufactured by Dainichi Seika) and then in a heating furnace. The foam layer was formed by heating at ° C for 30 seconds and foaming the resin layer 7 times.

Test example 1
For the wallpaper obtained in each Example and Comparative Example, the storage elastic modulus G ′, loss elastic modulus G ″ and Tan δ at material temperatures of 200 ° C. and 240 ° C. were measured, respectively. The results are shown in Table 1.

表１の結果からも明らかなように、物性値が本発明の範囲外である比較例１及び比較例２では、十分な表面強度が得られなかった。これに対し、本発明品は、所定の物性を満たし、表面強度も十分満足できるものであった。

As is clear from the results in Table 1, in Comparative Examples 1 and 2 whose physical property values are outside the scope of the present invention, sufficient surface strength was not obtained. On the other hand, the product of the present invention satisfies predetermined physical properties and sufficiently satisfies the surface strength.

It is a figure (sectional drawing) which shows an example of the wallpaper of this invention. It is a figure (sectional drawing) which shows an example of the wallpaper of this invention.

Claims (4)

A wallpaper in which a polyolefin resin foam layer is laminated on a fibrous base sheet,
(1) The foam layer is formed of a resin composition comprising 1) at least one of an ethylene-vinyl acetate copolymer and an ethylene-methyl methacrylate copolymer, 2) a foaming agent, and 3) a crosslinking aid. And
(2) The storage elastic modulus and Tan δ at 200 to 240 ° C. of the foam layer are 1600 to 18000 Mpa and 0.8 to 2.0, respectively.
(3) The loss elastic modulus and Tan δ at 200 to 240 ° C. of the foam layer are 1600 to 18000 Mpa and 0.8 to 2.0, respectively.
A wallpaper characterized by that. The wallpaper according to claim 1, wherein a part or all of the crosslinking aid is an acrylic monomer. The wallpaper of Claim 1 whose vinyl acetate component of the said ethylene-vinyl acetate copolymer is 15 to 30 weight%. The wallpaper of Claim 1 whose methyl methacrylate component of the said ethylene-methyl methacrylate copolymer is 15 to 30 weight%.

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