JP5476893B2 - Foam decorative sheet - Google Patents

Description

  The present invention relates to a foam decorative sheet.

  Conventionally, foamed decorative sheets (foamed wallpaper) are known in which a foamed resin layer of vinyl chloride resin is formed on a base material (for example, backing paper). In recent years, in consideration of the environment, halogen-free resins such as ethylene-vinyl acetate copolymer resin (EVA), acrylic resin, and olefin resin have been used for the foamed resin layer (Patent Document 1). ~ 3 etc.).

  For example, an emulsion containing an acrylic resin and an ethylene-vinyl acetate copolymer resin is coated with a paint containing a microcapsule-type foaming agent, dried, printed with a pattern, and then heated and foamed. A foamed decorative sheet formed by forming an uneven pattern with an embossed plate is known. In addition, after forming an unfoamed resin layer made of a resin composition obtained by adding a thermally decomposable foaming agent to an ethylene-vinyl acetate copolymer resin on a substrate using a T-die extruder, a pattern layer is formed on the surface. A foamed decorative sheet is known which is printed and then heated and foamed to form an uneven pattern with an embossed plate.

  And as a technique for newly imparting functionalities such as mechanical strength, concealment of the foundation, flame retardancy effect, fire spread prevention effect, dimensional stability, moisture absorption and desorption to the foamed decorative sheet described above, an inorganic filler is used. It is proposed to contain in an olefin resin layer (patent documents 4-6 etc.).

Japanese Patent Laid-Open No. 6-47875 JP 2000-255011 A JP 2001-347611 A Japanese Patent Laid-Open No. 11-207853 Japanese Patent Laid-Open No. 2004-300648 JP 2005-255994 A

  When an inorganic filler is contained in the olefin resin layer of the foamed decorative sheet, the above-described functionality is imparted. On the other hand, expansion of the foamed cell of the foamed resin layer is suppressed, or the foamed cell is broken. Therefore, there are problems such that the surface shape becomes rough and the desired expansion ratio cannot be obtained.

  Therefore, the main object of the present invention is to provide a foamed decorative sheet that is improved in these disadvantages, hardly breaks up, and has a desired expansion ratio.

  As a result of intensive studies, the present inventor has found that the above object can be achieved by employing a specific foamed resin layer, and has completed the present invention.

That is, this invention relates to the sheet | seat before foaming of the following foaming decorative sheet and a foaming decorative sheet .
1. A foamed decorative sheet having at least a foamed resin layer on a substrate,
(1) The foamed resin layer is formed by foaming a foaming agent-containing resin layer,
(2) The foaming agent-containing resin layer is
(I) a layer formed by a polymer obtained by using at least one selected from the group consisting of acrylic acid and methacrylic acid as a monomer, and (ii) a potassium titanate resin composition,
A foamed decorative sheet characterized by that.
2. The foamed decorative sheet according to Item 1, wherein the potassium titanate is contained in the resin composition in an amount of 5 parts by weight or more and less than 20 parts by weight with respect to 100 parts by weight of the polymer represented by (i) .
3 . Item 3. The foamed decorative sheet according to Item 1 or 2 , wherein the foaming agent-containing resin layer is crosslinked by electron beam irradiation.
4 . Item 4. The foamed decorative sheet according to any one of Items 1 to 3 , wherein a non-foamed resin layer B, the foamed resin layer, and the non-foamed resin layer A are sequentially formed on a substrate.
5 . Item 5. The foamed decorative sheet according to any one of Items 1 to 4 , which is embossed from the top surface layer of the foamed decorative sheet.
6 . 6. A foam wallpaper comprising the foam decorative sheet according to any one of items 1 to 5 .
7). It is a sheet before foaming of a foamed decorative sheet having at least a foaming agent-containing resin layer on a substrate,
The foaming agent-containing resin layer is
(I) a polymer obtained using as a monomer at least one selected from the group consisting of acrylic acid and methacrylic acid, and
(Ii) Potassium titanate
A layer formed by a resin composition comprising:
A sheet before foaming of the foamed decorative sheet.
8). Foaming of the foamed decorative sheet according to Item 7, wherein the potassium titanate is contained in the resin composition in an amount of 5 parts by weight or more and less than 20 parts by weight with respect to 100 parts by weight of the polymer represented by (i). Previous sheet.
9. Item 9. The sheet before foaming of the foamed decorative sheet according to Item 7 or 8, wherein the foaming agent-containing resin layer is crosslinked by electron beam irradiation.
10. The sheet | seat before foaming of the foaming decorative sheet in any one of said item 7-9 in which the non-foaming resin layer B, the said foaming agent containing resin layer, and the non-foaming resin layer A are formed in order on the base material.

  Hereinafter, the foamed decorative sheet of the present invention will be described in detail.

1. Foamed decorative sheet The foamed decorative sheet of the present invention is a foamed decorative sheet having at least a foamed resin layer on a substrate,
(1) The foamed resin layer is formed by foaming a foaming agent-containing resin layer,
(2) The foaming agent-containing resin layer is
(I) It is a layer formed by a polymer obtained by using at least one selected from the group consisting of acrylic acid and methacrylic acid as a monomer, and (ii) a resin composition containing a titanic acid compound.

  The foamed decorative sheet of the present invention having the above-mentioned features has not only functions such as mechanical strength, base concealment, flame retardancy, fire spread prevention, dimensional stability, moisture absorption and desorption, but also breaks bubbles. It is difficult to achieve a desired expansion ratio.

The material of the base material is not particularly limited as long as it has mechanical strength, heat resistance and the like suitable as a decorative sheet base material. For example, a fiber sheet can be generally used.

  Specifically, among fiber sheets, flame retardant paper (pulp-based sheets treated with flame retardants such as guanidine sulfamate and guanidine phosphate); inorganic additives such as aluminum hydroxide and magnesium hydroxide Inorganic paper including; fine paper; thin paper and the like.

Although the basis weight of the substrate is not critical, preferably about 50 to 300 g / ^{m 2,} about 50 to 80 g / ^{m 2} is more preferable.

Non-foamed resin layer B
In the present invention, a non-foamed resin layer (non-foamed resin layer B) may be formed between the substrate and the foamed resin layer as necessary. In particular, when the non-foamed resin layer B is formed as an adhesive layer, excellent adhesion between the substrate and the foamed resin layer can be obtained.

Examples of the non-foamed resin layer B include a low density polyethylene polymer, an ethylene-methacrylic acid copolymer (EMAA), an ethylene-acrylic acid copolymer (EAA), an ethylene-vinyl acetate copolymer (EVA), and an epoxy. Resins, urethane resins and the like can be suitably used.
The non-foamed resin layer B may contain known additives in addition to the resin component, but is preferably blended so that the content of the resin component is 70 to 100% by weight.

  The thickness of the non-foamed resin layer B is not limited, but is preferably about 10 to 50 μm, more preferably about 10 to 20 μm.

Foamed resin layer The foamed resin layer is a layer formed by foaming the foaming agent-containing resin layer.

The foaming agent-containing resin layer is formed of a resin composition containing, as a resin component, a polymer obtained using at least one of acrylic acid (CH ₂ ═CHCOOH) and methacrylic acid (CH ₂ ═C (CH ₃ ) COOH) as a monomer. Layer.

Examples of the polymer (the polymer of the present invention) obtained using at least one of acrylic acid (CH ₂ ═CHCOOH) and methacrylic acid (CH ₂ ═C (CH ₃ ) COOH) as a monomer include, for example, at least acrylic acid and methacrylic acid. A copolymer obtained by combining one type of monomer and ethylene can be preferably used. More specifically, it is preferable to use at least one of ethylene-methacrylic acid copolymer (EMAA), ethylene-acrylic acid copolymer (EAA), and ionomer resin.

  The content of acrylic acid or methacrylic acid in the copolymer is preferably about 4 to 20% by weight. A commercial item can also be used regarding such resin.

  Further, the melt flow rate value (JIS K7210: 190 ° C., 2.16 kg) of the resin component depends on the type of polymer to be used, but it is usually preferably 3 to 200 g / 10 minutes.

  The foaming agent is preferably a pyrolytic foaming agent. Examples of the thermally decomposable foaming agent include azo series such as azodicarbonamide (ADCA) and azobisformamide; bidazide series such as oxybenzenesulfonyl hydrazide (OBSH) and paratoluenesulfonyl hydrazide. The content of the pyrolytic foaming agent is preferably about 1 to 20 parts by weight with respect to 100 parts by weight of the resin component. The expansion ratio is preferably 4 times or more, and more preferably about 5 to 8 times.

  If necessary, a foaming aid that accelerates the decomposition of the foaming agent can be used in combination in order to obtain a further foaming effect. For example, when azodicarbonamide is used as the foaming agent, adipic acid dihydrazide, zinc oxide, lead sulfate, urea, zinc stearate, etc. are used as the foaming aid. It is done. The content of the foaming aid is preferably about 0.3 to 10 parts by weight and more preferably about 1 to 5 parts by weight with respect to 100 parts by weight of the resin component.

  The resin composition for forming the foaming agent-containing resin layer of the present invention contains a polymer obtained by using at least one of acrylic acid and methacrylic acid as a monomer as a resin component, and contains a pyrolytic foaming agent as the foaming agent. In addition, it further contains a titanic acid compound.

  Specifically, the titanate compound is preferably a metal titanate compound, potassium titanate, barium titanate, strontium titanate, calcium titanate, magnesium titanate, lead titanate, aluminum titanate, lithium titanate. And sodium titanate. Of the above titanate compounds, potassium titanate is preferable.

  The content of the titanic acid compound is preferably 5 parts by weight or more and less than 20 parts by weight, and more preferably 10 to 19 parts by weight with respect to 100 parts by weight of the resin component.

  The titanic acid compound is not particularly limited in terms of shape, but is preferably fibrous.

  When the titanic acid compound is fibrous, the diameter and length are not particularly limited. However, the diameter is usually 0.01 μm to 100 μm, preferably 0.1 μm to 50 μm, preferably 0.1 μm to 10 μm. Is more preferable. Moreover, the length of 0.1 micrometer-10000 micrometers can be used normally, 1 micrometer-1000 micrometers are preferable, and 1 micrometer-100 micrometers are more preferable.

  In addition, a titanic acid compound can be used individually by 1 type or in mixture of 2 or more types.

  Various additives may be added to the resin composition. For example, inorganic fillers and pigments. In addition, stabilizers, lubricants, and the like can be used as additives.

  Examples of the inorganic filler include calcium carbonate, aluminum hydroxide, magnesium hydroxide, antimony trioxide, zinc borate, and a molybdenum compound. By including an inorganic filler, an effect of suppressing see-through, an effect of improving surface characteristics, and the like are obtained.

  As for the pigment, for example, titanium dioxide, zinc white, carbon black, black iron oxide, yellow iron oxide, yellow lead, molybdate orange, cadmium yellow, nickel titanium yellow, chrome titanium yellow, iron oxide (valve), cadmium red, Inorganic pigments such as ultramarine, bitumen, cobalt blue, chromium oxide, cobalt green, aluminum powder, bronze powder, titanium mica, zinc sulfide; for example, aniline black, perylene black, azo (azo lake, insoluble azo, condensed azo), many Cyclic (isoindolinone, isoindoline, quinophthalone, perinone, flavantron, anthrapyrimidine, anthraquinone, quinacridone, perylene, diketopyrrolopyrrole, dibromoanthanthrone, dioxazine, thioindigo, phthalocyanine, indanthro , And organic pigments halogenated phthalocyanine), or the like.

  What is necessary is just to implement according to the method described in the manufacturing method of the postscript as a method of foaming a foaming agent containing resin layer.

Non-foamed resin layer A
A non-foamed resin layer A may be further formed on the front surface of the foamed resin layer.

The non-foamed resin layer (non-foamed resin layer A) mainly protects the foamed resin layer. For example, in the present invention, a polymer obtained by using at least one of acrylic acid (CH ₂ ═CHCOOH) and methacrylic acid (CH ₂ ═C (CH ₃ ) COOH) as a monomer, a polypropylene polymer, a high-density polyethylene polymer, A layer formed of a resin composition containing a hard resin component such as a hard vinyl chloride polymer or a polycarbonate polymer is preferably a non-foamed resin layer. Especially, the polymer obtained by using at least 1 sort (s) of acrylic acid and methacrylic acid as a monomer is more preferable.

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

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

  The thickness of the non-foamed resin layer is not limited, but is preferably about 10 to 50 μm, more preferably about 10 to 20 μm.

  Moreover, although content of the said resin component in a resin composition is not limited, Usually, it is preferable to set suitably in the range of 70 to 100 weight%.

  In this invention, you may have a pattern layer on the front surface of the non-foamed resin layer A as needed.

  The design pattern layer imparts design properties to the foamed decorative sheet. Examples of the design pattern include a wood grain pattern, a stone pattern, a grain pattern, a tiled pattern, a brickwork pattern, a cloth pattern, a leather pattern, a geometric figure, a character, a symbol, and an abstract pattern. A design pattern can be selected according to the kind of foaming decorative sheet.

  The pattern pattern layer can be formed, for example, by printing a pattern pattern on the front surface of the non-foamed resin layer A. In addition, when forming a picture pattern layer, you may form a primer layer previously as needed. Examples of printing methods include gravure printing, flexographic printing, silk screen printing, and offset printing. As the printing ink, a printing ink containing a colorant, a binder resin, and a solvent (or a dispersion medium) can be used. These inks may be known or commercially available.

  As the colorant, for example, a pigment used in the above-described foaming agent-containing resin layer can be appropriately used.

  The binder resin is, for example, an acrylic resin, a styrene resin, a polyester resin, a urethane resin, a chlorinated polyolefin resin, a vinyl chloride-vinyl acetate copolymer resin, a polyvinyl butyral resin, an alkyd resin, or a petroleum resin. Examples include resins, ketone resins, epoxy resins, melamine resins, fluorine resins, silicone resins, fiber derivatives, rubber resins, and the like.

  Examples of the solvent (or dispersion medium) include petroleum organic solvents such as hexane, heptane, octane, toluene, xylene, ethylbenzene, cyclohexane, and methylcyclohexane; ethyl acetate, butyl acetate, 2-methoxyethyl acetate, and acetic acid-2 -Ester-based organic solvents such as ethoxyethyl; alcohol-based organic solvents such as methyl alcohol, ethyl alcohol, normal propyl alcohol, isopropyl alcohol, isobutyl alcohol, ethylene glycol, propylene glycol; ketones such as acetone, methyl ethyl ketone, methyl isobutyl ketone, and cyclohexanone Organic solvents; ether organic solvents such as diethyl ether, dioxane, tetrahydrofuran; dichloromethane, carbon tetrachloride, trichloroethylene, tetrachloroethylene Chlorinated organic solvents; and water.

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

Surface protective layer (overcoat layer)
In the present invention, a surface protective layer may be provided on the surface of the design pattern layer for the purpose of adjusting the gloss and / or protecting the design pattern layer. The kind of surface protective layer is not limited. If it is a surface protective layer aiming at gloss adjustment, there exists a surface protective layer containing known fillers, such as a silica, for example. As a method for forming the surface protective layer, a known method such as gravure printing can be employed. In addition, when the adhesiveness of a pattern pattern layer and a surface protective layer is not fully acquired, a surface protective layer can also be provided after carrying out the adhesion process (primer process) of the surface of a pattern pattern layer.

  When forming a surface protective layer for the purpose of surface strength (scratch resistance, etc.), stain resistance, and protection of a pattern layer of a foamed decorative sheet, those containing an ionizing radiation curable resin as a resin component are suitable. It is. The ionizing radiation curable resin is preferably one that undergoes radical polymerization (curing) by electron beam irradiation. Examples thereof include polyfunctional monomers such as neopentyl glycol dimethacrylate and trimethylolpropane trimethacrylate, oligomers, and the like. Moreover, it is preferable to set it as about 0-10 weight part with respect to 100 weight part of resin components, and it is more preferable to set it as 1-4 weight part especially.

  The thickness of the surface protective layer is not limited, but is preferably about 0.1 to 15 μm.

Embossing In this invention, you may attach | subject an embossing pattern suitably. In this case, what is necessary is just to emboss from the uppermost surface layer (opposite side of a base material) of a foaming decorative sheet. Embossing can be performed by known means such as pressing an embossed plate. For example, when the outermost surface layer is a surface protective layer, a desired embossed pattern can be formed by pressing the embossed plate after heat-softening the front surface. Examples of the embossed pattern include a wood grain plate conduit groove, a stone plate surface unevenness, a cloth surface texture, a satin texture, a grain texture, a hairline, and a multiline groove.

2. The manufacturing method of a foaming decorative sheet The manufacturing method of a foaming decorative sheet is not specifically limited.

For example, each material of the foaming agent-containing resin layer is a known kneading machine such as a Banbury mixer, a pressure kneader, a roll, a single screw extruder, a twin screw extruder under the condition that the foaming agent does not foam above the melting point of the resin. After melt-kneading and forming into a sheet using a known sheet molding machine such as a calendar or T-die, a foaming agent-containing sheet is laminated on the substrate. Under the present circumstances, you may laminate | stack a non-foaming layer on the upper and lower sides or one side of a foaming agent containing sheet | seat as needed. Next, a pattern layer pattern layer and a surface protective layer are formed on the foaming agent-containing resin layer or the non-foaming resin layer, and then the foaming resin layer is formed by heating and foaming the foaming agent-containing resin layer. The heating conditions are not limited as long as the foamed resin layer is formed by the decomposition of the pyrolytic foaming agent. (The heating temperature is about 200 to 220 ° C., and the heating time is about 30 to 45 seconds.)
Note that electron beam irradiation may be performed before the heat treatment. Thereby, since a resin component can be bridge | crosslinked, the surface strength of a foaming decorative sheet, a foaming degree, etc. can be controlled. The energy of the electron beam is preferably about 150 to 250 kV. The irradiation amount is preferably about 1 to 7 Mrad. A known electron beam irradiation apparatus can be used as the electron beam source.

  In addition, when a surface protective layer containing an ionizing radiation curable resin is formed, the surface protective layer is formed simultaneously with the crosslinking of the resin component of the foaming agent-containing resin layer or the non-foamed resin layer by electron beam irradiation (same treatment). Can be cured. That is, a foaming agent-containing resin layer, a non-foaming resin layer, a pattern layer, and a surface protective layer containing an ionizing radiation curable resin are sequentially formed, and then irradiated with an electron beam to form a foaming agent-containing resin layer and a non-foaming resin layer. The resin component contained in the resin can be cross-linked and the resin contained in the surface protective layer can be cured.

  Here, the ionizing radiation curable resin is not limited to the surface protective layer resin composition, and can be added to any or all of the foamed resin layer resin composition and the non-foamed layer resin composition. By adding an ionizing radiation curable resin to the foamed resin layer resin composition and the non-foamed layer resin composition, crosslinking of the resin component can be promoted.

The foam decorative sheet of the present invention foams a foaming agent-containing resin layer formed by a resin composition containing a polymer obtained by using at least one selected from the group consisting of acrylic acid and methacrylic acid as a monomer, and a titanic acid compound. by, hardly bubbles broken after foaming molding, it is possible to have a desired expansion ratio.

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

Example 1
The foaming agent-containing resin composition was kneaded at 110 ° C. for 10 minutes with the following composition, then formed into a film having a thickness of 100 μm, and bonded to the backing paper. Then, electron beam irradiation was performed and the resin component in a foaming agent containing resin composition was bridge | crosslinked. Finally, OP “AL-TOP402B, manufactured by Dainichi Seika” is coated on the foaming agent-containing resin layer with a flat printing press (GP-II), heated in a gear oven (220 ° C.), and the foaming agent-containing resin A foaming decorative sheet was produced by foaming the foaming agent contained in the layer.
Foaming agent-containing resin composition:
Resin EMAA “Nucleel N1560 (methacrylic acid content = 15 wt%, melt flow rate value (MFR) = 60), made by Mitsui DuPont Polychemical”, 100 parts by weight,
40 parts by weight of titanium dioxide “Taipeku CR-63, manufactured by Ishihara Sangyo”
Foaming agent ADCA (azodicarbonamide) "AZ Ultra 3050I, manufactured by Otsuka Chemical" 7.1 parts by weight,
19 parts by weight of potassium titanate “Tismo D (fibrous, 0.3 to 0.6 μm in diameter, 10 to 20 μm in length), manufactured by Otsuka Chemical”
Foaming aid Adipic acid dihydrazide "ADHS, Otsuka Chemical" 4.7 parts by weight,
Stabilizer Low molecular weight polyethylene “Excellex DM01, Mitsui Chemicals” 2.5 parts by weight.

Example 2
A foamed decorative sheet was prepared in the same manner as in Example 1 except that EAA “RESQUEPEARL AS211S (acrylic acid content = 8.5 wt%, MFR = 25), manufactured by Nippon Polyethylene” was used instead of EMAA.

Comparative Example 1
Example 1 is used except that ethylene-vinyl acetate copolymer (EVA) “Evaflex V406 (vinyl acetate content = 20 wt%, MFR = 20), manufactured by Mitsui DuPont Polychemical” is used instead of EMAA. A foamed decorative sheet was obtained in the same manner.

Comparative Example 2
A foamed decorative sheet was obtained in the same manner as in Example 1 except that polyethylene resin (PE) “Sample D, manufactured by Nippon Polyethylene” was used instead of EMAA.

Comparative Example 3
A foamed decorative sheet was produced in the same manner as in Example 1 except that calcium carbonate “Whiteon H, manufactured by Shiroishi Kogyo” was used instead of potassium titanate.

Comparative Example 4
A foamed decorative sheet was produced in the same manner as in Example 1 except that wollastonite “SH-1800, manufactured by Kinsei Matec” was used instead of potassium titanate.

Comparative Example 5
A foamed decorative sheet was produced in the same manner as in Example 1 except that kaolinite “Eckalite 1, manufactured by Imeris” was used instead of potassium titanate.

Comparative Example 6
A foamed decorative sheet was produced in the same manner as in Example 1 except that mica “A-11, manufactured by Yamaguchi Mica Industries Co., Ltd.” was used instead of potassium titanate.

Comparative Example 7
A foamed decorative sheet was produced in the same manner as in Example 1 except that talc “TT talc, manufactured by Takehara Chemical Industries” was used instead of potassium titanate.

Comparative Example 8
A foamed decorative sheet was produced in the same manner as in Example 1 except that silica “Nipseal LP, manufactured by Tosoh Silica” was used instead of potassium titanate.

Test example (surface appearance test)
The surface of the foamed decorative sheet produced in the examples and comparative examples was visually observed. The evaluation method is
○: No bubble removal was confirmed Δ: Bubble removal was slightly confirmed ×: Bubble removal was confirmed and a large hole was formed on the surface.

Test example (foam volume)
The foam volume of the foam decorative sheet produced in the examples and comparative examples was measured by the thickness ratio (magnification) before and after foaming. In addition, the evaluation method relates to the thickness ratio (magnification) before and after foaming.
○: 5 times or more Δ: 4 times or more and less than 5 times ×: less than 4 times.

  With respect to the sheets obtained in the examples and comparative examples, the surface appearance and the characteristics of the foam volume were examined. The results are shown in Table 1.

  As is clear from the above results, the foamed decorative sheet of the present invention is difficult to break after foam molding by employing a combination of a specific resin component, an inorganic filler and a foaming agent in the foaming agent-containing resin layer. It becomes possible to have a desired expansion ratio.

Claims (10)

A foamed decorative sheet having at least a foamed resin layer on a substrate,
(1) The foamed resin layer is formed by foaming a foaming agent-containing resin layer,
(2) The foaming agent-containing resin layer is
(I) a layer formed by a polymer obtained by using at least one selected from the group consisting of acrylic acid and methacrylic acid as a monomer, and (ii) a potassium titanate resin composition,
A foamed decorative sheet characterized by that. The foamed decorative sheet according to claim 1, wherein the potassium titanate is contained in the resin composition in an amount of 5 parts by weight or more and less than 20 parts by weight with respect to 100 parts by weight of the polymer represented by (i). The foaming agent-containing resin layer is crosslinked by electron beam irradiation, foamed decorative sheet according to claim 1 or 2. The foamed decorative sheet according to any one of claims 1 to 3 , wherein a non-foamed resin layer B, the foamed resin layer, and the non-foamed resin layer A are sequentially formed on a substrate. The foaming decorative sheet according to any one of claims 1 to 4 , wherein embossing is applied from above the outermost surface layer of the foaming decorative sheet. Foam wallpaper made of foamed decorative sheet according to any one of claims 1-5. It is a sheet before foaming of a foamed decorative sheet having at least a foaming agent-containing resin layer on a substrate,
The foaming agent-containing resin layer is
(I) a polymer obtained using as a monomer at least one selected from the group consisting of acrylic acid and methacrylic acid, and
(Ii) Potassium titanate
A layer formed by a resin composition comprising:
A sheet before foaming of the foamed decorative sheet. Foaming of the foamed decorative sheet according to claim 7, wherein the potassium titanate is contained in the resin composition in an amount of 5 parts by weight or more and less than 20 parts by weight with respect to 100 parts by weight of the polymer represented by (i). Previous sheet. The sheet before foaming of the foamed decorative sheet according to claim 7 or 8, wherein the foaming agent-containing resin layer is crosslinked by electron beam irradiation. The sheet | seat before foaming of the foaming decorative sheet in any one of Claims 7-9 in which the non-foaming resin layer B, the said foaming agent containing resin layer, and the non-foaming resin layer A are formed in order on the base material.