JP2006097192A - Wall paper - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide non-vinyl chloride-based wall paper which has a high surface strength and excellent flame retardancy. <P>SOLUTION: This wall paper sequentially having at least a foamed resin layer, a pattern layer and a surface-protecting layer on a fibrous substrate sheet is characterized by the following characteristics. (1) An inorganic filler except a colored pigment is contained in the foamed resin layer in an amount of 10 to 70 wt.%. (2) The maximum thickness of the wall paper excluding the substrate sheet is ≥0.4 mm. (3) The thickness of the surface-protecting layer is ≥0.02 mm. (4) A total calorific value for 10 min in a state that the wall paper is laminated to a semi-nonflammable gypsum board substrate with a starch-based paste in a solid content of ≥60 g/m<SP>2</SP>according to ISO 5660 cone calorimeter method is ≤8 MJ/m<SP>2</SP>. <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 foamed layer, 2) a method of laminating an ethylene-vinyl alcohol copolymer (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, in these prior arts, the surface strength in the wallpaper is not sufficient, and further improvement is necessary. By the way, there are two methods for evaluating the surface strength: 1) a scratch test and 2) a wear test. In particular, it is necessary to improve the quality so that good results can be obtained in the latter test.

  For example, a) a method of forming a durable and slippery film layer that can withstand abrasion on a decorative layer (pattern layer), and b) a thickness using a normal resin. A method of forming a resin layer, increasing the service life, and imparting durability can be considered.

  However, in the method a), a crystalline film (ethylene-vinyl alcohol copolymer, polypropylene, polyethylene, etc.) having excellent strength can be used, but there are problems (for example, end curl) when constructing wallpaper. There is a drawback that is likely to occur.

  In the method b), the thicker the resin layer, the lower the nonflammability, and the nonflammability standard (quasi-incombustible) cannot be cleared.

  Accordingly, a main object of the present invention is to provide a non-vinyl chloride wallpaper having high surface strength and excellent flame retardancy.

  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 having at least a foamed resin layer, a pattern layer and a surface protective layer in order on a fibrous base material sheet,
(1) The foamed resin layer contains 10 to 70% by weight of an inorganic filler other than the color pigment,
(2) The maximum thickness of the wallpaper excluding the base sheet is 0.4 mm or more,
(3) The thickness of the surface protective layer is 0.02 mm or more,
(4) Based on the ISO 5660 exothermic test method, the total calorific value for 10 minutes is 8 MJ / m ² or less in a state where the starch paste has a solid content of 60 g / m ² or more and the wallpaper is laminated on the semi-incombustible gypsum board substrate.
A wallpaper characterized by that.

  2. Item 2. The wallpaper according to Item 1, wherein at least one of the foamed resin layer and the surface protective layer is crosslinked.

  3. Item 2. The item 1, wherein at least one of the foamed resin layer and the surface protective layer contains at least one resin of ethylene-vinyl acetate copolymer and ethylene-methyl methacrylate copolymer, and is crosslinked. wallpaper.

  According to the present invention, since a foamed resin layer containing a specific amount of filler is employed, a wallpaper that exhibits excellent flame retardancy while maintaining the same physical properties as conventional polyolefin wallpaper is provided. can do.

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

The wallpaper of the present invention is a wallpaper having at least a foamed resin layer, a pattern layer, and a surface protective layer in this order on a fibrous base material sheet,
(1) The foamed resin layer contains 10 to 70% by weight of an inorganic filler other than the color pigment,
(2) The maximum thickness of the wallpaper excluding the base sheet is 0.4 mm or more,
(3) The thickness of the surface protective layer is 0.02 mm or more,
(4) The total calorific value for 10 minutes is 8 MJ / m ² or less in a state in which the starch paste is 60 g / m ² or more and the wallpaper is laminated on the semi-incombustible gypsum board substrate based on the ISO 5660 exothermic test method.
It is characterized by that.

  The wallpaper of the present invention has a maximum thickness of 0.4 mm or more (preferably 0.5 to 0.9 mm) excluding the base sheet. The maximum thickness means the thickness of the portion where the thickness is maximum. By setting the thickness within the above range, good flame retardancy can be exhibited together with excellent surface strength.

The wallpaper of the present invention has a total calorific value of 10 MJ / m ² or less for 10 minutes in a state where the wallpaper is laminated on a semi-incombustible gypsum board substrate with a starch paste of 60 g / m ² or more based on the ISO 5660 exothermic test method. .

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. Can be suitably used. In particular, by blending a compound containing water of crystallization such as magnesium hydroxide, it is possible to suitably achieve flame retardancy 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. Examples of the wet nonwoven fabric include 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 can be used as the nonwoven fabric.

Foamed resin layer The foamed resin layer contains 10 to 70% by weight (preferably 15 to 50% by weight) of inorganic filler other than the color pigment. By setting to such a range, in addition to excellent surface strength, good workability (particularly workability at the time of cutting with a cutter) and the like can be obtained.

  The inorganic filler is not limited as long as it is other than a color pigment. For example, in addition to powder (particles) such as calcium carbonate, barium sulfate, clay, talc, mica, silica, alumina, diatomaceous earth, silica sand, shirasu balloon Examples include various inorganic fillers such as inorganic hollow bodies. These can be used alone or in combination of two or more.

  The resin constituting the foamed resin layer is not limited, but is particularly preferably a polyolefin resin. Examples of the polyolefin resin include polyolefins such as polyethylene, polypropylene, polybutene, polybutadiene, and polyisoprene; copolymers of two or more olefins such as ethylene, propylene, butene, butadiene, and isoprene; α-olefins having 4 or more carbon atoms Copolymer (linear low density polyethylene); ethylene-acrylic acid copolymer, ethylene-methyl acrylate copolymer, ethylene-ethyl acrylate copolymer, ethylene-methacrylic acid copolymer, ethylene-vinyl acetate Mention may be made of copolymers, saponified ethylene-vinyl acetate copolymers, ionomers, or mixed resins containing one or more of these.

  In the present invention, 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 is preferably one having a vinyl acetate component (VA component) of 10 to 30% by weight (particularly 15 to 25% by weight). Moreover, as for EMMA, what a methyl methacrylate component (EMA component) is 5-30 weight% (especially 10-20 weight%) is desirable. By using a material having such a range, desired foaming stability and foam flexibility can be obtained more effectively.

  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, a flame retardant can be added to impart flame retardancy. 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 desirable 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.

  Further, a colored pigment can be added to the foamed resin layer to give transparent coloring or opaque coloring. As the color 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 be used alone or in combination of two or more. Moreover, these can select either a transparent colored pigment or an opaque colored pigment according to a use. These pigments may be added and dispersed as powder or scaly foil pieces.

  The foamed resin layer is formed by using the above resin, a foaming agent, and a resin composition containing a cross-linking agent as necessary. For example, an extrusion method using a T-die, a calendering method, a dry lamination method using an adhesive, or a sol coating. Any known method such as a method can be employed. 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.

  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 240 ° 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-described 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, 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 ; 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 or the like encapsulating a thermally expansible gas 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, but is generally about 400 to 900 μm. The foamed resin layer is not particularly limited in the expansion ratio, but is usually 5 times or more, preferably 6 times or more (particularly about 6 to 10 times). If it is the said range, desired surface strength, workability, etc. can be obtained more reliably.

  Moreover, when bridge | crosslinking a foamed resin layer, after forming a foamed resin layer, what is necessary is just to implement a crosslinking process in the state by which a foamed resin layer is unfoamed. When performing a crosslinking treatment, a crosslinking agent can be used. The cross-linking agent is not particularly limited as long as it cross-links the polyolefin-based resin, and may be appropriately selected according to the type of the polyolefin-based resin used. In the present invention, an acrylic monomer or the like can be particularly preferably used.

  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.

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

  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 One type or a mixture of two or more types of resin may be used, and a pigment, a solvent, various auxiliary agents, and the like may be added thereto to make 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.

  In the wallpaper of the present invention, the thickness of the surface protective layer is 0.01 mm or more, preferably 0.05 to 0.12 mm. Thereby, excellent surface strength and the like can be obtained.

  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, 1) a resin composition containing a foaming agent, a flame retardant, titanium dioxide, an inorganic filler, and EVA or EMMA is heated and melt extruded to form an unfoamed foamed resin layer, and 2) an unfoamed foamed resin layer. The exposed surface is subjected to corona discharge treatment, and a pattern layer is formed on the surface subjected to corona discharge treatment by gravure printing. 3) Surface protection made of unstretched nylon resin by hot melt extrusion over the entire pattern layer 4) After the layer is formed, the unfoamed foamed resin layer is foamed in a heating foaming furnace, and an uneven pattern is formed with an embossed plate from the surface protective layer side to the foamed resin layer, and then cooled. By doing so, wallpaper can be obtained.

  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.

  EXAMPLES Hereinafter, an Example is shown and this invention is demonstrated in detail. 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") 30 parts by weight, Titanium (DuPont "R108") 25 parts by weight, foaming agent (Yewa Kasei "ADCA # 3") 3 parts by weight, foaming agent (Yewa Kasei "OBSH # 5000") 1 part by weight and stabilizer (Asahi Denka Kogyo) ("OF101" manufactured) 5 parts by weight of the kneaded material was used.

  First, the kneaded material was heated to 130 ° C., formed into a film by T-die extrusion, and laminated on a backing paper as a base material to form a foamed resin layer. Crosslinking treatment was performed by irradiating the foamed resin layer with an electron beam (175 kv, 8 Mrad). Next, a pattern layer was formed by a gravure printing method using a two-component curable polyester-based ink (“FPGR” manufactured by Showa Ink Industries Co., Ltd.). A surface protective layer was formed on the pattern layer. Then, it heated at 230 degreeC for 30 second in the heating furnace, and the foamed resin layer was formed by making the said foamed resin layer foam 7 times. Thus, a wallpaper having a thickness of each layer of 100 μm of base material / 560 μm of foamed resin layer / 2 μm of pattern layer / 20 μm of surface protective layer was obtained.

The obtained wallpaper was laminated on a semi-incombustible gypsum board base material using a commercially available starch-based paste “Loua Mild” (manufactured by Yayoi Chemical) at a solid content of 60 g / m ² or more based on the ISO 5660 exothermic test method. The total calorific value for 10 minutes was measured. As a result, the calorific value was 7.4 MJ / m ² .

Claims (3)

A wallpaper having at least a foamed resin layer, a pattern layer and a surface protective layer in order on a fibrous base material sheet,
(1) The foamed resin layer contains 10 to 70% by weight of an inorganic filler other than the color pigment,
(2) The maximum thickness of the wallpaper excluding the base sheet is 0.4 mm or more,
(3) The thickness of the surface protective layer is 0.02 mm or more,
(4) Based on the ISO 5660 exothermic test method, the total calorific value for 10 minutes is 8 MJ / m ² or less in a state where the starch paste has a solid content of 60 g / m ² or more and the wallpaper is laminated on the semi-incombustible gypsum board substrate.
A wallpaper characterized by that. The wallpaper according to claim 1, wherein at least one of the foamed resin layer and the surface protective layer is crosslinked. The at least one of a foamed resin layer and a surface protective layer contains at least 1 sort (s) of ethylene-vinyl acetate copolymer and ethylene-methyl methacrylate copolymer, and is bridge | crosslinked. wallpaper.