JP2006097210A - Wall paper - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide polyolefin-based wall paper which can be used as a substitute of vinyl chloride-based wall paper, in various characteristics including a surface strength. <P>SOLUTION: This wall paper in which at least a first non-foamed resin layer, a foamed resin layer, a second non-foamed resin layer, a pattern layer, and a surface-protecting layer are sequentially laminated is characterized in that (1) at least the foamed resin layer comprises at least one of ethylene-vinyl acetate copolymer and ethylene-methyl methacrylate copolymer and is cross-linked, and (2) the second non-foamed resin layer has a thickness of 15 to 50 μm. <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, decorative sheets that do not use vinyl chloride have been considered, and wallpaper (so-called non-vinyl chloride resin wallpaper) using foamed polyolefin has been proposed.

  However, polyolefin-based wallpaper has a drawback that its surface strength is lower than that of vinyl chloride. Therefore, various methods have been proposed to improve this problem.

For example, 1) a method of omitting the foam layer, 2) a method of laminating an ethylene-vinyl alcohol copolymer resin (EVOH) film on the outermost layer on the printed layer (Patent Document 1), 3) the uppermost layer on the printed layer A method of laminating a non-halogen film on the surface layer (Patent Document 2), 4) A method of applying an emulsion coat such as an ethylene-vinyl acetate copolymer to the outermost layer on the printed layer, and 5) An expansion ratio of the foam layer 6) A method of reducing the magnification of the foam layer on the upper layer (picture layer side) (Patent Document 3), 7) A non-foam layer between the foam layer and the print layer A forming method (Patent Document 4) and the like are known.
Japanese Utility Model Publication No.59-172797 JP 2003-200513 A JP 2001-277407 A JP-A-10-278199

  However, these conventional techniques have a problem in any of points such as designability and economic efficiency (manufacturing cost) in addition to the improvement of the surface strength. Therefore, as a result, the actual situation is that a polyolefin-based wallpaper comparable to the vinyl chloride-based wallpaper has not been developed yet.

  Accordingly, a main object of the present invention is to provide a polyolefin-based wallpaper that can be used as a substitute for a vinyl chloride-based wallpaper in various properties such as surface strength.

  As a result of intensive studies to solve the above problems, the present inventors have found that the above object can be achieved by using a specific resin composition for forming a foam layer, thereby completing the present invention. It came to.

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

1. A wallpaper in which at least a first non-foamed resin layer, a foamed resin layer, a second non-foamed resin layer, a picture layer, and a surface protective layer are sequentially laminated on the fibrous base sheet,
(1) At least the foamed resin layer contains at least one resin of an ethylene-vinyl acetate copolymer and an ethylene-methyl methacrylate copolymer, and is crosslinked.
(2) The second non-foamed resin layer has a thickness of 15 to 50 μm.
The wallpaper characterized by the above (1st invention).

2. A wallpaper in which at least a first non-foamed resin layer, a foamed resin layer, a pattern layer, a second non-foamed resin layer, and a surface protective layer are sequentially laminated on the fibrous base sheet,
(1) At least the foamed resin layer contains at least one resin of an ethylene-vinyl acetate copolymer and an ethylene-methyl methacrylate copolymer, and is crosslinked.
(2) The second foamed resin layer has a thickness of 8 to 50 μm.
The wallpaper characterized by the above (2nd invention).

    3. Item 3. The wallpaper according to Item 1 or 2, wherein the second non-foamed resin layer contains at least one resin of ethylene-vinyl acetate copolymer and ethylene-methyl methacrylate copolymer and is crosslinked. .

  According to the present invention, since the foamed resin layer and the non-foamed resin layer are employed in a specific combination, it is possible to provide a wallpaper having excellent surface strength and good design.

  Moreover, since the wallpaper of this invention uses EVA or EMMA for a foamed resin layer at least, it can be manufactured at low cost.

  The wallpaper of the present invention having such features is suitable as an alternative to the conventional vinyl chloride wallpaper.

The wallpaper of the first invention is a wallpaper in which at least a first non-foamed resin layer, a foamed resin layer, a second non-foamed resin layer, a picture layer and a surface protective layer are laminated in order on the fibrous base material sheet,
(1) At least the foamed resin layer contains at least one resin of an ethylene-vinyl acetate copolymer and an ethylene-methyl methacrylate copolymer, and is crosslinked.
(2) The second non-foamed resin layer has a thickness of 15 to 50 μm.
It is characterized by that.

The wallpaper of the second invention is a wallpaper in which at least a first non-foamed resin layer, a foamed resin layer, a pattern layer, a second non-foamed resin layer and a surface protective layer are laminated in order on the fibrous base sheet,
(1) At least the foamed resin layer contains at least one resin of an ethylene-vinyl acetate copolymer and an ethylene-methyl methacrylate copolymer, and is crosslinked.
(2) The second foamed resin layer has a thickness of 15 to 50 μm.
It is characterized by that.

  Thus, since both inventions are common except that the positions of the second non-foamed resin layer and the pattern layer are different, each layer of both inventions will be described together.

  In addition, the structure of the wallpaper of this invention may contain other layers (an adhesive layer, a primer layer, etc.) within the range which does not prevent the effect of this invention.

As the fibrous substrate fibrous substrate sheet, for example, paper, nonwoven 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 first non-foamed resin layer, the second non-foamed resin layer, the first non-foamed resin layer, and the second non-foamed resin layer (hereinafter collectively referred to as “non-foamed resin layer”) are not resin layers. Both of them may be the same or different.

  As for a non-foaming resin layer, it is desirable that the 2nd non-foaming resin layer is bridge | crosslinked especially. Thereby, higher surface strength can be given to the wallpaper. The method for the crosslinking treatment can be carried out in the same manner as in the case of the foamed resin layer described later. In this case, a crosslinking agent can be mix | blended with the said resin composition like a foamed resin layer.

  The resin constituting the non-foamed resin layer is not limited, but is particularly preferably a polyolefin resin. Examples of the polyolefin-based resin include one type of polyolefin such as polyethylene, polypropylene, polybutene, polybutadiene, and polyisoprene, and two or more types of copolymers of olefins such as ethylene, propylene, butene, butadiene, and isoprene. Copolymer of 4 or more α-olefins (linear low density polyethylene), or ethylene-acrylic acid copolymer, ethylene-methyl acrylate copolymer, ethylene-ethyl acrylate copolymer, ethylene-methacrylic acid copolymer Examples thereof include polymers, ethylene-vinyl acetate copolymers, saponified ethylene-vinyl acetate copolymers, ionomers, or mixed resins composed of one or more of these. Among these, at least one of ethylene-vinyl acetate copolymer (EVA) and ethylene-methyl methacrylate copolymer (EMMA) is particularly preferable. EVA and EMMA are not particularly limited, and known or commercially available products can be used. In particular, EVA preferably has a vinyl acetate component (VA component) of 15 to 30% by weight. Moreover, as for EMMA, what a methyl methacrylate component (EMA component) is 15 to 30 weight% is desirable.

  In the present invention, resin components other than EVA and EMMA may be included. For example, polyethylene, ethylene / propylene copolymer, ethylene / butene-1 copolymer, polypropylene, propylene / butene-1 copolymer, polybutene-1, butene-1 / propylene / ethylene / ternary copolymer, butene -1, hexene-1, octene-1, ternary copolymer, polymethylpentene, and olefin elastomers described in JP-A-6-16832 and JP-B-6-23278 can be used. . These resins can be used alone or in combination of two or more.

  In addition to these resins, other additives can be blended as necessary. For example, an inorganic filler can be added to give an increase effect, or a flame retardant can be added to give flame retardancy. Moreover, when bridge | crosslinking, the crosslinking adjuvant used with a foamed resin layer can also be mix | blended.

  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.

  Various rubbers can also be added to the polyolefin resin for the purpose of imparting flexibility, impact resistance, and easy adhesion.

  Examples of rubbers include diene rubbers, hydrogenated diene rubbers, and olefin elastomers. Among these, hydrogenated diene rubber is preferable. The hydrogenated diene rubber is obtained by adding a hydrogen atom to at least a part of a double bond of a diene rubber molecule, and is used as a modifier for a polyolefin resin in the present invention. There is a role to suppress the crystallization of the polyolefin resin and increase the flexibility and transparency. In general, when a diene rubber is added to a polyolefin resin, the weather resistance and heat resistance are lower than those of a polyolefin resin without the addition of a diene rubber due to the double bond of the diene rubber. Since the double bond is saturated with hydrogen, the weather resistance and heat resistance of the polyolefin resin are not deteriorated, and the double bond is satisfactory.

  Examples of the diene rubber include isoprene rubber, butadiene rubber, butyl rubber, propylene / butadiene rubber, acrylonitrile / butadiene rubber, acrylonitrile / isoprene rubber, and styrene / butadiene rubber. For the purpose of the present invention, styrene-butadiene rubber and the like are particularly preferable.

  The amount of rubber added is not particularly limited, but it is usually about 1 to 90 parts by weight with respect to 100 parts by weight of the polyolefin resin.

  Moreover, the method of adding a pigment and performing transparent coloring or opaque coloring is mentioned. As the pigment, known or commercially available pigments can be used. For example, titanium white, zinc white, petal, vermilion, ultramarine blue, cobalt blue, titanium yellow, yellow lead, carbon black and other inorganic pigments, isoindolinone, Hansa Yellow A, quinacridone, permanent red 4R, phthalocyanine blue, indanthrene Examples include organic pigments (including dyes) such as Brie RS and aniline black, metallic pigments such as aluminum and brass, pearlescent pigments made of foil powder such as titanium dioxide-coated mica and basic lead carbonate, and the like. 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.

  The non-foamed resin layer can be formed by any known method such as an extrusion method using a T-die, a calendering method, a dry lamination method using an adhesive, or a sol coating method. In this case, a method of directly forming a layer made of the resin composition on the fibrous base material to form a laminate may be used, or after forming the layer made of the resin composition alone, Any of the methods of laminating the layers may be used. Moreover, what is necessary is just to implement a crosslinking process, after forming a 2nd non-foaming resin layer, when bridge | crosslinking. The method for the crosslinking treatment may be the same as the method applied for the foamed resin layer described later.

  Regarding the thickness of the non-foamed resin layer, particularly in the wallpaper of the first invention, the thickness of the second non-foamed resin layer is 15 to 50 μm, preferably 20 to 40 μm. In particular, in the wallpaper of the second invention, the thickness of the second non-foamed resin layer is 8 to 50 μm, preferably 15 to 40 μm. By controlling the thickness in this range, excellent surface strength can be achieved.

  In both the first and second inventions, the thickness of the first non-foamed resin layer is not limited, and may generally be about 50 μm or less, but is appropriately set according to the use of the wallpaper, desired characteristics, etc. be able to.

Foamed resin layer The foamed resin layer contains at least one resin of ethylene-vinyl acetate copolymer (EVA) and ethylene-methyl methacrylate copolymer (EMMA) and is crosslinked.

  EVA and EMMA are not particularly limited, and those used in the non-foamed resin layer can be suitably used.

  Moreover, when using a crosslinking agent, what is necessary is just to crosslink polyolefin resin, and what is necessary is just to select suitably according to the kind etc. of polyolefin resin to be used. In the present invention, an acrylic monomer or the like can be particularly preferably used.

  For example, the foamed resin layer is formed by using the resin composition containing the resin, the foaming agent, and, if necessary, a cross-linking agent. This can be done.

  The method of crosslinking treatment is not limited, but crosslinking treatment (curing treatment) with ionizing radiation is particularly preferable. For example, a layer made of the resin composition is formed on a fibrous base material sheet, and cross-linked by irradiation with ionizing radiation such as an electron beam in order to widen the temperature range of foaming suitable viscosity. Thereby, the productivity is stabilized and the foamed sheet on the surface is cross-linked by the electron beam, so that the surface becomes harder and the surface is hardly damaged.

  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 100 to 1000 keV, preferably 100 to 300 keV.

  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.

  A well-known or commercially available foaming agent can be used. For example, when a foaming agent is added to a composition such as plastisol or organosol of the above-mentioned polyolefin resin and mechanically foamed by stirring with a stirrer such as a planetary mixer, a commercially available foaming agent can be used. good. Also, azo compounds such as azodicarbonamide and azobisisobutyronitrile; sulfonyl hydrazide compounds such as paratoluenesulfonyl hydrazide and oxybisbenzenesulfonyl hydrazide; nitroso compounds such as N, N′-dinitrosopentamethylenetetramine; In addition to pyrolytic foaming agents such as ammonium carbonate, sodium boron hydride, potassium hydrogen carbonate, sodium hydrogen carbonate, etc., resin shells made of acrylonitrile, methyl (meth) acrylate, etc., hexane, heptane, butane, air, etc. A microcapsule type foaming agent in which a heat-expandable gas is encapsulated 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.

  When a foam layer is formed using a pyrolytic foaming agent, a foaming accelerator can be added as necessary together with the foaming agent. 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 kind of 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 thickness of the foamed resin layer (thickness after foaming) is not particularly limited, and can be appropriately set according to desired characteristics. Further, the foamed resin layer is not particularly limited in the foaming ratio, but it may be usually about 3 to 7 times. If it is the said range, desired surface strength, workability, etc. can be obtained more reliably.

Picture layer The picture layer can be generally formed with ink by a known printing method such as gravure printing, offset printing or silk screen printing.

  Examples of the printed picture include a printed pattern such as a wood grain pattern, a stone pattern, a cloth pattern, a skin pattern, a geometric figure, a character, a symbol, or a solid pattern.

  As printing inks, as vehicles, for example, chlorinated polyolefins such as chlorinated polyethylene and chlorinated polypropylene, polyester, polyurethane made of isocyanate and polyol, acrylic, vinyl acetate, vinyl chloride / vinyl acetate copolymer, cellulose resin, polyamide It is possible to use a mixture of one type or two or more types of resin based on a pigment, a solvent, various auxiliary agents, and the like, which are converted into an ink. In particular, in the present invention, a non-chlorine resin in which one or two or more of polyester, polyurethane composed of isocyanate and polyol, acrylic, vinyl acetate, cellulose resin, polyamide resin and the like are mixed is preferable.

Surface protective layer The surface protective layer can impart surface physical properties such as scratch resistance, abrasion resistance, and contamination resistance to the wallpaper.

  The resin for forming the surface protective layer is not limited, but nylon resin is particularly preferable in terms of excellent scratch resistance, abrasion resistance, stain resistance, and the like. Nylon resin is a polymer having an amide bond in the main chain. Nylon resin is a linear polyamide resin obtained by polycondensation of diamine and dibasic acid, ring-opening polymerization of lactam, polycondensation of aminocarboxylic acid, etc. It is called resin. There are two types of nylon resins, nylon mn (m is diamine, n is the number of carbon atoms of each dibasic acid) and nylon n (n is the number of carbon atoms of ω-amino acid or lactam). Nylon resin, which is one of these high-functional plastics, is a crystalline linear polymer and has a unique amide bond -CONH- in the molecular chain, so various excellent properties (impact resistance, Abrasion resistance, self-extinguishing).

  As a method for forming the surface protective layer, for example, a material obtained by heating and melting the resin is applied using a coating means such as an extrusion coating method, or a film obtained by forming the resin by a known dry lamination method or the like. It can be formed by pasting.

  The thickness of the surface protective layer is not limited, but is preferably in the range of 5 to 30 μm from the viewpoint of surface physical properties, workability, cost effectiveness, and the like.

  Moreover, an uneven | corrugated pattern can also be formed from the surface protection layer as needed. When the decorative sheet is in a heated state using a well-known sheet or rotary embossing machine, the concave / convex pattern is provided with irregularities with the embossed plate from the outermost layer and then cooled, thereby protecting the surface protective layer. Unevenness can be formed over the foamed resin layer. Examples of the shape of the uneven pattern include a wood grain plate conduit groove, a stone plate surface unevenness, a cloth surface texture, a satin finish, a grain, a hairline, and a ridge groove.

Other layers The wallpaper of the present invention may contain other layers (adhesive layer, primer layer, etc.) as necessary in addition to the above-mentioned layers.

  For the adhesive layer, for example, a known acrylic or urethane adhesive can be used.

  As the primer layer (or 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 agent (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.

Wallpaper Manufacturing Method The wallpaper manufacturing method of the present invention may be carried out according to the above-described forming method. For example, after 1) a resin composition containing EVA or EMMA is heated and melted on a base material layer made of backing paper to form a first non-foamed resin layer, 2) a foaming agent, a flame retardant, titanium dioxide and EVA Alternatively, a resin composition containing EMMA is heated and melt extruded to form an unfoamed foamed resin layer, and 3) the corona discharge treatment is applied to the exposed surface of the unfoamed foamed resin layer, and the corona discharge treatment is performed. A pattern layer is formed on the surface by gravure printing, 4) a resin composition containing EVA or EMMA is heated and melted to form a second non-foamed resin layer on the pattern layer, and 5) a second non-foamed resin layer. A surface protective layer made of unstretched nylon resin is formed on the entire surface by hot melt extrusion, and 6) the unfoamed foamed resin layer is foamed in a heating foaming furnace, and the surface protective layer side is Over the foam resin layer, After forming the unevenness pattern by Nbosu Edition, by cooling, it is possible to obtain a picture.

  Thus, the pattern layer can be clearly formed by forming the foamed resin layer by melt extrusion in an unfoamed state. In addition, when an unstretched nylon resin is used as the surface protective layer, in particular, a sharp concavo-convex pattern excellent in embossing shapeability can be obtained very efficiently. Further, when the surface protective layer is formed, more excellent adhesion can be obtained by simultaneously heating and extruding two layers of nylon resin and adhesive resin so that the adhesive resin is in contact with the pattern layer. .

Adhering material The adhering material for attaching the wallpaper of the present invention is not particularly limited. For example, gypsum board, perlite board, flat plate such as jar , door, plate material such as curved plate, three-dimensional article [molded product], etc. Articles of various shapes are targeted.

  As a method for laminating these various adherends, for example, 1) a method of laminating an adherend with a pressure roller through an adhesive layer therebetween, 2) a wallpaper on the surface of the adherend A so-called vacuum press laminating method in which wallpaper is laminated on the surface of a molded product by pressure difference due to vacuum suction from the adherend (molded product) side through or opposite to the adhesive layer. The wall paper 4 is supplied to the pillars such as through the adhesive layer, and the wall paper is sequentially pressure-bonded and laminated on the plurality of side faces constituting the columnar body by a plurality of differently oriented rollers. There is a so-called lapping method. In particular, a wrapping method is preferable as a method for attaching the wallpaper to the three-dimensional object.

  The wallpaper of the present invention is subjected to a predetermined molding process 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, the present invention will be described in more detail with reference to Examples and Comparative Examples. However, the scope of the present invention is not limited to the examples.

Example 1 and Comparative Examples 1-2
As a resin composition for forming the foam layer, ethylene-acetic acid copolymer (Sumitomo Chemical "5053", MFR70, VA20) 100 parts by weight, calcium carbonate (Shiraishi Kogyo "Whiteon H") 25 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 Asahi Denka), 3 parts by weight of a foaming agent (“AC # 3-K2” manufactured by Eiwa Kasei), A kneaded product A of 1 part by weight of “N # 5000” manufactured by Eiwa Chemical Co., Ltd.) and 1 part by weight of a crosslinking agent (manufactured by JSR, acrylic monomer) was used.

  As the resin composition for forming the first non-foamed resin layer and the second non-foamed resin layer, the kneaded material B containing no foaming agent in the composition was used.

  For the surface protective layer, an ethylene vinyl alcohol copolymer resin-based paint (“Soarnol” manufactured by Nippon Synthetic Chemical) was used.

  Using these, a wallpaper having the structure shown in FIG. 1 was produced. In this case, the thickness of the first non-foamed resin layer was 12 μm, and the thickness of the second non-foamed resin layer was set as shown in Table 1.

まず、前記混練物Ｂを１２０℃に加熱し、Ｔダイ押し出しによって製膜し、基材である裏打ち紙上に積層することによって第１非発泡樹脂層を形成した。次に、前記混練物Ｂを同様にして製膜し、これを第１非発泡樹脂層上に積層することにより発泡樹脂層を形成した。発泡樹脂層に電子線を照射（１７５ｋｖ，５Ｍｒａｄ）することにより架橋処理を実施した。次いで、発泡樹脂層上に第１非発泡樹脂層の場合と同様にして第２非発泡樹脂層を形成した。第２発泡樹脂層の表面に、２液硬化型ポリエステル系インキ（「ＦＰＧＲ」昭和インク工業所製）を用いて石目柄印刷をグラビア印刷法にて絵柄層の形成を行った。この絵柄層上に前記塗料を塗布することにより表面保護層を形成した。その後、加熱炉中にて２３０°Ｃで３０秒加熱し、前記発泡樹脂層を５倍に発泡させることにより発泡体層を形成した。

First, the kneaded material B was heated to 120 ° C., formed into a film by T-die extrusion, and laminated on a backing paper as a base material to form a first non-foamed resin layer. Next, the kneaded product B was formed in the same manner, and this was laminated on the first non-foamed resin layer to form a foamed resin layer. Crosslinking treatment was performed by irradiating the foamed resin layer with an electron beam (175 kv, 5 Mrad). Next, a second non-foamed resin layer was formed on the foamed resin layer in the same manner as in the case of the first non-foamed resin layer. A pattern layer was formed on the surface of the second foamed resin layer by a gravure printing method using a two-component curable polyester-based ink (“FPGR” manufactured by Showa Ink Industries, Ltd.). A surface protective layer was formed by applying the paint on the pattern layer. Then, it heated at 230 degreeC for 30 second in the heating furnace, and the foam layer was formed by foaming the said foamed resin layer 5 times.

Example 2 and Comparative Examples 3-4
A wallpaper was manufactured in the same manner as in Example 1 except that the laminated structure of the wallpaper was as shown in FIG.

Test example 1
The surface strength of the wallpaper obtained in the examples and comparative examples was measured. The test was conducted according to the surface strengthening test of the vinyl industry association, and the scratch load (weight) was 5 times the standard. The results are shown in Table 1.

2 is a cross-sectional view of wallpaper made in Example 1, Comparative Example 1 and Comparative Example 2. FIG. 6 is a cross-sectional view of wallpaper made in Example 2, Comparative Example 3 and Comparative Example 4. FIG.

Claims (3)

A wallpaper in which at least a first non-foamed resin layer, a foamed resin layer, a second non-foamed resin layer, a picture layer, and a surface protective layer are sequentially laminated on the fibrous base sheet,
(1) At least the foamed resin layer contains at least one resin of an ethylene-vinyl acetate copolymer and an ethylene-methyl methacrylate copolymer, and is crosslinked.
(2) The second non-foamed resin layer has a thickness of 15 to 50 μm.
A wallpaper characterized by that. A wallpaper in which at least a first non-foamed resin layer, a foamed resin layer, a pattern layer, a second non-foamed resin layer, and a surface protective layer are sequentially laminated on the fibrous base sheet,
(1) At least the foamed resin layer contains at least one resin of an ethylene-vinyl acetate copolymer and an ethylene-methyl methacrylate copolymer, and is crosslinked.
(2) The second foamed resin layer has a thickness of 8 to 50 μm.
A wallpaper characterized by that. The wallpaper according to claim 1 or 2, wherein the second non-foamed resin layer contains at least one resin of an ethylene-vinyl acetate copolymer and an ethylene-methyl methacrylate copolymer and is crosslinked. .

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