JP2006097247A - Foam wallpaper having high workability and scratch resistance - Google Patents

Foam wallpaper having high workability and scratch resistance Download PDF

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Publication number
JP2006097247A
JP2006097247A JP2004281531A JP2004281531A JP2006097247A JP 2006097247 A JP2006097247 A JP 2006097247A JP 2004281531 A JP2004281531 A JP 2004281531A JP 2004281531 A JP2004281531 A JP 2004281531A JP 2006097247 A JP2006097247 A JP 2006097247A
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resin layer
foamed
foamed resin
wallpaper
layer
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JP4556071B2 (en
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Yoshiaki Nezu
義昭 根津
Kazuhiro Takahashi
一弘 高橋
Masaru Okamoto
優 岡本
Toshikazu Nishio
俊和 西尾
Osayuki Ono
修之 小野
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Dai Nippon Printing Co Ltd
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Abstract

<P>PROBLEM TO BE SOLVED: To provide foam wallpaper having excellent foaming performance and high scratch performance, and superior in workability, without causing the problem of a curl. <P>SOLUTION: In this foam wallpaper, a foam resin layer and an unfoamed resin layer are laminated in order on a paper base material. The foam wallpaper is characterized in that (1) resins for constituting the foam resin layer and the unfoamed resin layer are the same, and (2) both resins for constituting the foam resin layer and the unfoamed resin layer are cross-linked, and (3) the unfoamed resin layer has cross-linking density larger than the foam resin layer. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

本発明は、施工性及び耐スクラッチ性の高い発泡壁紙に関する。   The present invention relates to a foam wallpaper having high workability and scratch resistance.

壁紙表面の耐スクラッチ性(耐擦傷性)を高めるために、従来、壁紙表面に耐スクラッチ性の高い保護フィルムを貼着する技術が知られている。公知の保護フィルムとしては、例えば、ポリエチレン樹脂、アクリル樹脂、エバール(ポリビニルアルコール共重合体)樹脂、フッ素(フッ素/アクリル共押出し)樹脂等のフィルムが挙げられる。   In order to improve the scratch resistance (scratch resistance) of the wallpaper surface, a technique for sticking a protective film having high scratch resistance to the wallpaper surface is conventionally known. Examples of known protective films include films of polyethylene resin, acrylic resin, eval (polyvinyl alcohol copolymer) resin, fluorine (fluorine / acrylic coextrusion) resin, and the like.

例えば、特許文献1には、紙基材上にエチレン系樹脂からなる発泡層及び保護層が順に積層された発泡壁紙であって、該保護層が0.935g/cm3以上0.950g/cm3以下の密度からなると共にその厚さが5μm以上20μm以下であるポリエチレンで構成されていることを特徴とする発泡壁紙が開示されている。この技術は、特定の密度及び厚みを有するポリエチレンフィルムを保護フィルムとして用いて、発泡壁紙の耐スクラッチ性を高めている。 For example, Patent Document 1 discloses a foam wallpaper in which a foam layer and a protective layer made of an ethylene-based resin are sequentially laminated on a paper base material, and the protective layer is 0.935 g / cm 3 or more and 0.950 g / cm. There is disclosed a foamed wallpaper characterized by being made of polyethylene having a density of 3 or less and a thickness of 5 μm or more and 20 μm or less. This technique uses a polyethylene film having a specific density and thickness as a protective film to improve the scratch resistance of foamed wallpaper.

このように、最表面に耐スクラッチ性の高い保護フィルムを貼着する場合には、容易に壁紙表面に耐スクラッチ性を高めることができると考えられるが、保護フィルムの種類によっては、次のような問題が生じる。   In this way, when a protective film having high scratch resistance is stuck on the outermost surface, it is considered that the scratch resistance can be easily increased on the wallpaper surface, but depending on the type of protective film, Problems arise.

例えば、保護フィルムとそれが貼着される層(保護フィルムの隣接下層)とが異種素材の場合には、壁紙が激しくカールして施工性が悪いという問題がある。カールの問題は保護フィルムと隣接下層の素材とを同じにすれば解消することができるが、該隣接下層が発泡層であって硬い素材の場合には、必然的に保護フィルムも硬い素材となるため、所定の発泡特性が阻害される。他方、保護フィルムの硬度が発泡層の硬度と同程度且つ軟らかい場合には、カール及び発泡性に問題がなくても、耐スクラッチ性が不十分となる。
特開2004−052371号公報
For example, when the protective film and the layer to which the protective film is attached (adjacent lower layer of the protective film) are made of different materials, there is a problem that the wallpaper is severely curled and the workability is poor. The problem of curling can be solved by making the protective film and the material of the adjacent lower layer the same, but if the adjacent lower layer is a foam layer and is a hard material, the protective film is necessarily a hard material as well. Therefore, a predetermined foaming characteristic is inhibited. On the other hand, when the protective film has the same hardness as the foamed layer and is soft, the scratch resistance is insufficient even if there is no problem with curling and foaming.
Japanese Patent Laid-Open No. 2004-052371

本発明は、カールの問題がなく、その上、良好な発泡性及び高いスクラッチ性を有する、施工性の良好な発泡壁紙を提供することを主な目的とする。   The main object of the present invention is to provide a foam wallpaper having good workability, which has no curling problem and has good foamability and high scratch properties.

本発明者は、上記目的を達成すべく鋭意研究を重ねた結果、特定の発泡樹脂層及び非発泡樹脂層を形成することが上記目的の達成に寄与することを見出し、本発明を完成するに至った。   As a result of intensive studies to achieve the above object, the present inventors have found that the formation of a specific foamed resin layer and a non-foamed resin layer contributes to the achievement of the above object, and to complete the present invention. It came.

即ち、本発明は、下記の発泡壁紙に係る。
1.紙質基材上に発泡樹脂層及び非発泡樹脂層が順に積層されている発泡壁紙であって、
(1)発泡樹脂層及び非発泡樹脂層を構成する樹脂が同じであり、
(2)発泡樹脂層及び非発泡樹脂層を構成する樹脂がいずれも架橋されており、
(3)発泡樹脂層よりも非発泡樹脂層の方が大きな架橋密度を有する
ことを特徴とする発泡壁紙。
2.発泡樹脂層及び非発泡樹脂層を構成する樹脂がオレフィン系共重合体樹脂である上記項1記載の発泡壁紙。
3.発泡樹脂層及び非発泡樹脂層を構成する樹脂がエチレン−酢酸ビニル共重合体樹脂、エチレン−メチルアクリレート共重合体樹脂、エチレン−エチルアクリレート共重合体樹脂、炭素数3〜5のエチレン−アルキルアクリレート共重合体樹脂又はエチレン−メチルメタクリレート共重合体樹脂である上記項1又は2に記載の発泡壁紙。
4.発泡樹脂層及び非発泡樹脂層を構成する樹脂がエチレン−酢酸ビニル共重合体樹脂であり、該樹脂の酢酸ビニル含有量が10〜30重量%である上記項1〜3のいずれかに記載の発泡壁紙。
5.少なくとも非発泡樹脂層が無機質充填剤を含有する上記項1〜4のいずれかに記載の発泡壁紙。
6.少なくとも非発泡樹脂層が電子線照射による樹脂架橋を促進する架橋助剤を含有する上記項1〜5のいずれかに記載の発泡壁紙。
7.発泡樹脂層及び非発泡樹脂層が多層同時押出し法により形成されている上記項1〜6のいずれかに記載の発泡壁紙。
8.非発泡樹脂層から発泡樹脂層に達する凹凸模様を有する上記項1〜7のいずれかに記載の発泡壁紙。

以下、本発明の発泡壁紙について詳細に説明する。
That is, the present invention relates to the following foamed wallpaper.
1. A foam wallpaper in which a foam resin layer and a non-foam resin layer are sequentially laminated on a paper base material,
(1) The resins constituting the foamed resin layer and the non-foamed resin layer are the same,
(2) The resins constituting the foamed resin layer and the non-foamed resin layer are both crosslinked,
(3) A foamed wallpaper characterized in that the non-foamed resin layer has a higher crosslinking density than the foamed resin layer.
2. Item 2. The foamed wallpaper according to Item 1, wherein the resin constituting the foamed resin layer and the non-foamed resin layer is an olefin copolymer resin.
3. The resin constituting the foamed resin layer and the non-foamed resin layer is an ethylene-vinyl acetate copolymer resin, an ethylene-methyl acrylate copolymer resin, an ethylene-ethyl acrylate copolymer resin, or an ethylene-alkyl acrylate having 3 to 5 carbon atoms. Item 3. The foamed wallpaper according to item 1 or 2, which is a copolymer resin or an ethylene-methyl methacrylate copolymer resin.
4). Item 4. The resin according to any one of Items 1 to 3, wherein the resin constituting the foamed resin layer and the non-foamed resin layer is an ethylene-vinyl acetate copolymer resin, and the vinyl acetate content of the resin is 10 to 30% by weight. Foam wallpaper.
5. Item 5. The foamed wallpaper according to any one of Items 1 to 4, wherein at least the non-foamed resin layer contains an inorganic filler.
6). Item 6. The foamed wallpaper according to any one of Items 1 to 5, wherein at least the non-foamed resin layer contains a crosslinking aid that promotes resin crosslinking by electron beam irradiation.
7). Item 7. The foamed wallpaper according to any one of Items 1 to 6, wherein the foamed resin layer and the non-foamed resin layer are formed by a multilayer coextrusion method.
8). Item 8. The foamed wallpaper according to any one of Items 1 to 7, having a concavo-convex pattern reaching the foamed resin layer from the non-foamed resin layer.

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

本発明の発泡壁紙は、紙質基材上に発泡樹脂層及び非発泡樹脂層が順に積層されている発泡壁紙であって、
(1)発泡樹脂層及び非発泡樹脂層を構成する樹脂が同じであり、
(2)発泡樹脂層及び非発泡樹脂層を構成する樹脂がいずれも架橋されており、
(3)発泡樹脂層よりも非発泡樹脂層の方が大きな架橋密度を有する
ことを特徴とする。
The foam wallpaper of the present invention is a foam wallpaper in which a foam resin layer and a non-foam resin layer are sequentially laminated on a paper-based substrate,
(1) The resins constituting the foamed resin layer and the non-foamed resin layer are the same,
(2) The resins constituting the foamed resin layer and the non-foamed resin layer are both crosslinked,
(3) The non-foamed resin layer has a higher crosslink density than the foamed resin layer.

本発明の発泡壁紙は、発泡樹脂層及び非発泡樹脂層を構成する樹脂が同じであるため、発泡壁紙のカールが抑制されており、壁紙施工が容易である。また、発泡樹脂層及び非発泡樹脂層を構成する樹脂がいずれも架橋されており、しかも発泡樹脂層よりも非発泡樹脂層の方が大きな架橋密度を有するため、発泡壁紙表面の耐スクラッチ性が高い。   In the foamed wallpaper of the present invention, since the resin constituting the foamed resin layer and the non-foamed resin layer is the same, curling of the foamed wallpaper is suppressed, and the wallpaper construction is easy. In addition, since the resin constituting the foamed resin layer and the non-foamed resin layer are both cross-linked, and the non-foamed resin layer has a larger cross-linking density than the foamed resin layer, the scratch resistance of the foamed wallpaper surface is improved. high.

紙質基材
紙質基材としては特に限定されず、従来、壁紙用裏打紙として知られているものが広く使用できる。例えば、難燃紙(パルプ主体のシートをスルファミン酸グアニジン、リン酸グアニジンなどの難燃剤で処理したシート);水酸化アルミニウム、水酸化マグネシウム等の無機質剤を混抄した無機質紙;上質紙、薄用紙、和紙等の一般紙などが挙げられる。
The paper-based substrate is not particularly limited, and those conventionally known as backing paper for wallpaper can be widely used. For example, flame retardant paper (sheets made by treating pulp-based sheets with flame retardants such as guanidine sulfamate and guanidine phosphate); inorganic paper mixed with inorganic agents such as aluminum hydroxide and magnesium hydroxide; fine paper, thin paper And general paper such as Japanese paper.

紙質基材の坪量は特に限定的ではないが、通常20〜300g/m2、好ましくは40〜110g/m2程度である。 The basis weight of the paper-based substrate is not particularly limited, but is usually about 20 to 300 g / m 2 , preferably about 40 to 110 g / m 2 .

発泡樹脂層
紙質基材上には発泡樹脂層が形成されている。発泡樹脂層は、該層を構成する樹脂が架橋されており、架橋密度は後記する非発泡樹脂層よりも小さい。
Foamed resin layer A foamed resin layer is formed on the paper substrate. In the foamed resin layer, the resin constituting the layer is crosslinked, and the crosslinking density is smaller than that of the non-foamed resin layer described later.

発泡樹脂層を構成する樹脂としては特に限定されないが、加工適性、発泡適性等を考慮するとエチレン系樹脂が好ましい。例えば、エチレン単独重合体樹脂、エチレン−酢酸ビニル共重合体樹脂(EVA)、エチレン−メチルアクリレート共重合体樹脂(EMA)、エチレン−エチルアクリレート共重合体樹脂(EEA)、炭素数3〜5のエチレン−アルキルアクリレート共重合体樹脂、エチレン−メチルメタクリレート共重合体樹脂(EMMA)等のオレフィン系共重合体樹脂、これらの樹脂の混合物等が挙げられる。この中でも、特にエチレン−酢酸ビニル共重合体が好ましい。これらの樹脂は、いずれも電子線照射により容易に樹脂架橋させることができる。   Although it does not specifically limit as resin which comprises a foamed resin layer, Considering processability, foamability, etc., ethylene-type resin is preferable. For example, ethylene homopolymer resin, ethylene-vinyl acetate copolymer resin (EVA), ethylene-methyl acrylate copolymer resin (EMA), ethylene-ethyl acrylate copolymer resin (EEA), 3 to 5 carbon atoms Examples thereof include olefin copolymer resins such as ethylene-alkyl acrylate copolymer resins and ethylene-methyl methacrylate copolymer resins (EMMA), and mixtures of these resins. Among these, an ethylene-vinyl acetate copolymer is particularly preferable. Any of these resins can be easily crosslinked by electron beam irradiation.

エチレン−酢酸ビニル共重合体樹脂としては、酢酸ビニル含有量が10〜30重量%であるものが好ましい。   The ethylene-vinyl acetate copolymer resin is preferably one having a vinyl acetate content of 10 to 30% by weight.

発泡樹脂層に含まれる発泡剤としては特に限定されず、熱分解型発泡剤が好ましい。例えば、アゾジカルボンアミド、アゾビスホルムアミド等のアゾ系化合物、4,4’−オキシビスベンゼンスルホニルヒドラジド等のヒドラジット系化合物が挙げられる。これらの発泡剤は、1種又は2種以上を混合して使用できる。   It does not specifically limit as a foaming agent contained in a foamed resin layer, A thermal decomposition type foaming agent is preferable. Examples thereof include azo compounds such as azodicarbonamide and azobisformamide, and hydrazine compounds such as 4,4′-oxybisbenzenesulfonyl hydrazide. These foaming agents can be used alone or in combination of two or more.

発泡剤の添加量は発泡度合、発泡壁紙の意匠性等を考慮して適宜決めればよいが、樹脂100重量部に対して、通常2〜15重量部、好ましくは3〜6重量部程度である。   The addition amount of the foaming agent may be appropriately determined in consideration of the degree of foaming, the design of the foamed wallpaper, etc., but is usually about 2 to 15 parts by weight, preferably about 3 to 6 parts by weight with respect to 100 parts by weight of the resin. .

発泡樹脂層は、必要に応じて、無機充填剤を含有してもよい。無機充填剤としては、例えば、炭酸カルシウム、水酸化アルミニウム、水酸化マグネシウム、三酸化アンチモン、ホウ酸亜鉛、モリブデン化合物等が挙げられる。この中でも、特に水酸化アルミニウム、炭酸カルシウムが好ましい。無機充填剤を含有することにより、発泡壁紙の目透きを防止し、また発泡壁紙の耐スクラッチ性を高めることができる。無機充填剤の添加量としては、樹脂100重量部に対して、0〜100重量部であり、20〜70重量部が好ましい。好適な範囲内であれば、発泡壁紙の意匠性を損なうことなく、発泡壁紙の耐スクラッチ性を高めることができる。   The foamed resin layer may contain an inorganic filler as necessary. Examples of the inorganic filler include calcium carbonate, aluminum hydroxide, magnesium hydroxide, antimony trioxide, zinc borate, and a molybdenum compound. Among these, aluminum hydroxide and calcium carbonate are particularly preferable. By containing the inorganic filler, it is possible to prevent the foamed wallpaper from being seen through and to improve the scratch resistance of the foamed wallpaper. As addition amount of an inorganic filler, it is 0-100 weight part with respect to 100 weight part of resin, and 20-70 weight part is preferable. If it is in a suitable range, the scratch resistance of the foamed wallpaper can be enhanced without impairing the design of the foamed wallpaper.

発泡樹脂層は、必要に応じて、電子線照射による樹脂架橋を促進する架橋助剤を含有してもよい。   The foamed resin layer may contain a crosslinking aid that promotes resin crosslinking by electron beam irradiation, if necessary.

架橋助剤としては、電子線照射による樹脂架橋を促進するものであれば特に限定されず、例えば、ネオペンチルグリコールジメタクリレート、トリメチロールプロパントリメタクリレート等の多官能性モノマー、オリゴーなどが挙げられる。架橋助剤の添加量としては、樹脂100重量部に対して、0〜10重量部であり、1〜2重量部が好ましい。架橋助剤を多く添加すると、架橋密度が高くなるが、発泡樹脂層の架橋密度は後記する非発泡樹脂層の架橋密度よりも小さくなるように架橋助剤の量を調整する必要がある。   The crosslinking aid is not particularly limited as long as it promotes resin crosslinking by electron beam irradiation, and examples thereof include polyfunctional monomers such as neopentyl glycol dimethacrylate and trimethylolpropane trimethacrylate, oligos and the like. As addition amount of a crosslinking adjuvant, it is 0-10 weight part with respect to 100 weight part of resin, and 1-2 weight part is preferable. When a large amount of crosslinking aid is added, the crosslinking density increases, but it is necessary to adjust the amount of the crosslinking aid so that the crosslinking density of the foamed resin layer is smaller than the crosslinking density of the non-foamed resin layer described later.

発泡樹脂層は、必要に応じて、顔料等を添加して着色してもよい。また、発泡セル調整剤、熱安定剤、難燃剤等の周知の助剤を添加してもよい。これらの助剤の種類、添加量等は特に限定されず、発泡壁紙の所望の特性に応じて適宜設定できる。   The foamed resin layer may be colored by adding a pigment or the like, if necessary. Moreover, you may add well-known adjuvants, such as a foaming cell regulator, a heat stabilizer, a flame retardant. There are no particular limitations on the type, amount, and the like of these auxiliaries, which can be set as appropriate according to the desired characteristics of the foam wallpaper.

発泡樹脂層は、例えば、発泡樹脂層形成用組成物(樹脂、発泡剤、各種助剤等を含む混合物)を紙質基材上に積層後、樹脂を電子線照射により架橋させ、さらに層を発泡させることにより形成することができる。   The foamed resin layer is obtained by, for example, laminating a composition for forming a foamed resin layer (a mixture containing a resin, a foaming agent, various auxiliaries, etc.) on a paper base material, then crosslinking the resin by electron beam irradiation, and further foaming the layer Can be formed.

発泡樹脂層の積層方法としては、例えば、ドライラミネーション法、押出しラミネーション法等が挙げられる。また、Tダイ式押出し法、カレンダー法等により発泡樹脂層形成用組成物をシート化(フィルム化)すると同時に発泡樹脂層形成用組成物を紙質基材上に積層してもよい。発泡樹脂層形成用組成物が加工温度において高い流動性を示す場合には、例えば、ロールコート法、グラビアコート法、コンマコート法等の塗布技術を採用してもよい。本発明では、上記のTダイ式押出し法の中でも、マルチマニホールドタイプ又はフィードブロックを備えたTダイ押出機を用いて発泡樹脂層を形成する発泡樹脂層形成用組成物と後記する非発泡樹脂層を形成する非発泡樹脂層形成用組成物とを多層同時押出し法により紙質基材上に一体形成してもよい。発泡樹脂層と非発泡樹脂層とは同じ樹脂を用いているため、両層を形成する組成物の温度特性は同等であり、好適に多層(2層)同時押出し法を適用できる。樹脂としてエチレン−酢酸ビニル共重合体樹脂を用いる場合には、該樹脂の190℃におけるメルトフローレート(MFR)は40〜120g/10分程度であることが好ましい。多層同時押出し法を用いる場合には、2層の樹脂層が同時に形成されるため、その後、電子線照射及び加熱発泡等の工程を施せばよい。   Examples of the method for laminating the foamed resin layer include a dry lamination method and an extrusion lamination method. Alternatively, the foamed resin layer forming composition may be formed into a sheet (film) by a T-die extrusion method, a calendering method, or the like, and at the same time, the foamed resin layer forming composition may be laminated on a paper base. When the foamed resin layer forming composition exhibits high fluidity at the processing temperature, for example, a coating technique such as a roll coating method, a gravure coating method, or a comma coating method may be employed. In the present invention, among the above-described T-die extrusion methods, a foamed resin layer-forming composition that forms a foamed resin layer using a T-die extruder equipped with a multi-manifold type or feed block and a non-foamed resin layer described later And the non-foamed resin layer forming composition may be integrally formed on a paper substrate by a multilayer coextrusion method. Since the same resin is used for the foamed resin layer and the non-foamed resin layer, the temperature characteristics of the compositions forming both layers are equivalent, and a multilayer (two-layer) coextrusion method can be suitably applied. When an ethylene-vinyl acetate copolymer resin is used as the resin, the melt flow rate (MFR) at 190 ° C. of the resin is preferably about 40 to 120 g / 10 minutes. In the case of using the multilayer coextrusion method, two resin layers are formed at the same time, and thereafter, steps such as electron beam irradiation and heat foaming may be performed.

発泡樹脂層を構成する樹脂を架橋させるには、前記の通り、電子線を照射すればよい。電子線照射機器としては、当該分野で公知のものが使用できる。   In order to crosslink the resin constituting the foamed resin layer, the electron beam may be irradiated as described above. As an electron beam irradiation apparatus, a well-known thing can be used in the said field | area.

電子線照射量は特に限定されないが、発泡樹脂層の架橋密度が非発泡樹脂層の架橋密度よりも小さくなるように照射する必要がある。2層同時押出しにより発泡樹脂層及び非発泡樹脂層を同時に形成した場合には、両層への電子線照射量が同じになるが、この場合は、架橋助剤の量を調整することにより、架橋密度の程度を調整すればよい。電子線のエネルギーは、通常150〜250kV、好ましくは160〜200kV程度である。照射量は、通常1〜7Mrad、好ましくは2〜4Mrad程度である。   Although the amount of electron beam irradiation is not particularly limited, it is necessary to irradiate such that the crosslink density of the foamed resin layer is smaller than the crosslink density of the non-foamed resin layer. When the foamed resin layer and the non-foamed resin layer are simultaneously formed by two-layer coextrusion, the electron beam irradiation amount to both layers becomes the same, but in this case, by adjusting the amount of the crosslinking aid, What is necessary is just to adjust the grade of a crosslinking density. The energy of the electron beam is usually about 150 to 250 kV, preferably about 160 to 200 kV. The irradiation amount is usually about 1 to 7 Mrad, preferably about 2 to 4 Mrad.

発泡剤は、例えば、加熱により発泡させることができる。加熱条件は特に限定されず、所望の発泡度合、発泡壁紙の意匠性等に応じて適宜設定できる。   The foaming agent can be foamed by heating, for example. The heating conditions are not particularly limited, and can be appropriately set according to the desired degree of foaming, the design of the foamed wallpaper, and the like.

発泡樹脂層の厚みは特に限定されないが、通常300〜1000μm、好ましくは400〜800μm程度である。   Although the thickness of a foamed resin layer is not specifically limited, Usually, it is 300-1000 micrometers, Preferably it is about 400-800 micrometers.

非発泡樹脂層
発泡樹脂層の上には非発泡樹脂層が形成されている。
Non-foamed resin layer A non-foamed resin layer is formed on the foamed resin layer.

非発泡樹脂層を構成する樹脂は、発泡樹脂層を構成する樹脂と同じであり、非発泡樹脂層を構成する樹脂としても、エチレン−酢酸ビニル共重合体樹脂(特に酢酸ビニル含有量が10〜30重量%程度のもの)が好ましい。このように両層を形成する樹脂が同じであることにより、発泡壁紙のカールが抑制される。また、非発泡樹脂層を構成する樹脂は架橋されており、非発泡樹脂層の架橋密度は発泡樹脂層の架橋密度よりも大きい。非発泡樹脂層の架橋密度は発泡樹脂層の架橋密度よりも大きい限りにおいて、所望の耐スクラッチ性の程度に応じて適宜設定できる。   The resin constituting the non-foamed resin layer is the same as the resin constituting the foamed resin layer. Even if the resin constituting the non-foamed resin layer is used, an ethylene-vinyl acetate copolymer resin (particularly the vinyl acetate content is 10 to 10%). About 30% by weight) is preferred. In this way, curling of the foam wallpaper is suppressed by the same resin forming both layers. Moreover, resin which comprises a non-foamed resin layer is bridge | crosslinked, and the crosslink density of a non-foamed resin layer is larger than the crosslink density of a foamed resin layer. As long as the crosslink density of the non-foamed resin layer is larger than the crosslink density of the foamed resin layer, it can be appropriately set according to the desired degree of scratch resistance.

非発泡樹脂層に含まれてもよい無機系充填剤、架橋助剤、その他助剤等については、発泡樹脂層に含まれるものと同じでよい。   The inorganic filler, crosslinking aid, and other aids that may be contained in the non-foamed resin layer may be the same as those contained in the foamed resin layer.

本発明の発泡壁紙は、少なくとも非発泡樹脂層に無機質充填剤及び電子線照射による樹脂架橋を促進する架橋助剤から選択された少なくとも1種を含有することが好ましい。これにより、発泡壁紙表面の耐スクラッチ性を容易に高めることができる。   The foamed wallpaper of the present invention preferably contains at least one selected from an inorganic filler and a crosslinking aid that promotes resin crosslinking by electron beam irradiation in at least the non-foamed resin layer. Thereby, the scratch resistance of the foamed wallpaper surface can be easily increased.

非発泡樹脂層の無機質充填剤含有量は特に限定的ではないが、樹脂100重量部に対して、通常0〜100重量部、好ましくは20〜70重量部程度である。   The content of the inorganic filler in the non-foamed resin layer is not particularly limited, but is usually 0 to 100 parts by weight, preferably about 20 to 70 parts by weight with respect to 100 parts by weight of the resin.

非発泡樹脂層の架橋助剤の含有量も特に限定的ではないが、樹脂100重量部に対して、通常0.5〜10重量部、好ましくは1〜4重量部程度である。   The content of the crosslinking aid in the non-foamed resin layer is not particularly limited, but is usually about 0.5 to 10 parts by weight, preferably about 1 to 4 parts by weight with respect to 100 parts by weight of the resin.

非発泡樹脂層の形成方法も特に限定されず、発泡樹脂層の形成方法と同じでよく、特に両層を構成する樹脂が同じであることから、前記した発泡性樹脂層と非発泡性樹脂層とを同時形成する多層同時押出しによる形成法を好適に適用できる。   The method for forming the non-foamed resin layer is not particularly limited, and may be the same as the method for forming the foamed resin layer. In particular, since the resins constituting both layers are the same, the foamable resin layer and the non-foamable resin layer described above are used. The forming method by multi-layer coextrusion that simultaneously forms can be suitably applied.

非発泡樹脂層への電子線照射条件も、発泡樹脂層への電子線照射条件に倣えばよい。   The electron beam irradiation conditions for the non-foamed resin layer may also follow the electron beam irradiation conditions for the foamed resin layer.

非発泡樹脂層の厚みは特に限定されないが、通常2〜20μm、好ましくは5〜15μm程度である。   Although the thickness of a non-foaming resin layer is not specifically limited, Usually, 2-20 micrometers, Preferably it is about 5-15 micrometers.

絵柄模様層
非発泡樹脂層の上には、必要に応じて、絵柄模様層を形成してもよい。
A pattern layer may be formed on the non-foamed resin layer as necessary.

絵柄模様層は、発泡壁紙に所望の絵柄による意匠性を付与するものであり、絵柄の種類等は特に限定的ではない。例えば、木目模様、石目模様、砂目模様、タイル貼模様、煉瓦積模様、布目模様、皮絞模様、幾何学図形、文字、記号、抽象模様等が挙げられる。   The design pattern layer imparts design properties with a desired design to the foamed wallpaper, and the type of the design is not particularly limited. Examples thereof 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.

絵柄模様層の形成方法は特に限定されず、例えば、公知の着色剤(染料又は顔料)を結着材樹脂とともに溶剤(又は分散媒)中に溶解(又は分散)させて得られる着色インキ、コーティング剤等を用いた印刷法などにより形成すればよい。   The method for forming the pattern layer is not particularly limited. For example, a colored ink or coating obtained by dissolving (or dispersing) a known colorant (dye or pigment) in a solvent (or dispersion medium) together with a binder resin. What is necessary is just to form by the printing method etc. which used the agent etc.

着色剤としては、例えば、カーボンブラック、チタン白、亜鉛華、弁柄、紺青、カドミウムレッド等の無機顔料;アゾ顔料、レーキ顔料、アントラキノン顔料、キナクリドン顔料、フタロシアニン顔料、イソインドリノン顔料、ジオキサジン顔料等の有機顔料;アル
ミニウム粉、ブロンズ粉等の金属粉顔料;酸化チタン被覆雲母、酸化塩化ビスマス等の真珠光沢顔料;蛍光顔料;夜光顔料等が挙げられる。これらの着色剤は、単独又は2種以上を混合して使用できる。これらの着色剤には、シリカ等のフィラー、有機ビーズ等の体質顔料、中和剤、界面活性剤等がさらに配合してもよい。
Examples of the colorant include inorganic pigments such as carbon black, titanium white, zinc white, dial, bitumen, and cadmium red; azo pigments, lake pigments, anthraquinone pigments, quinacridone pigments, phthalocyanine pigments, isoindolinone pigments, dioxazine pigments. Organic pigments such as aluminum powder, metal powder pigments such as bronze powder, pearlescent pigments such as titanium oxide-coated mica and bismuth oxide chloride; fluorescent pigments; These colorants can be used alone or in admixture of two or more. These colorants may further contain fillers such as silica, extender pigments such as organic beads, neutralizing agents, surfactants and the like.

結着剤樹脂としては、例えば、アクリル系樹脂、スチレン系樹脂、ポリエステル系樹脂、ウレタン系樹脂、塩素化ポリオレフィン系樹脂、塩化ビニル−酢酸ビニル共重合体系樹脂、ポリビニルブチラール樹脂、アルキド系樹脂、石油系樹脂、ケトン樹脂、エポキシ系樹脂、メラミン系樹脂、フッ素系樹脂、シリコーン系樹脂、繊維素誘導体、ゴム系樹脂等が挙げられる。これらの樹脂は、単独又は2種以上を混合して使用できる。   Examples of the binder resin include acrylic resins, styrene resins, polyester resins, urethane resins, chlorinated polyolefin resins, vinyl chloride-vinyl acetate copolymer resins, polyvinyl butyral resins, alkyd resins, petroleum Resin, ketone resin, epoxy resin, melamine resin, fluorine resin, silicone resin, fiber derivative, rubber resin and the like. These resins can be used alone or in admixture of two or more.

溶剤(又は分散媒)としては、例えば、ヘキサン、ヘプタン、オクタン、トルエン、キシレン、エチルベンゼン、シクロヘキサン、メチルシクロヘキサン等の石油系有機溶剤;酢酸エチル、酢酸ブチル、酢酸−2−メトキシエチル、酢酸−2−エトキシエチル等のエステル系有機溶剤;メチルアルコール、エチルアルコール、ノルマルプロピルアルコール、イソプロピルアルコール、イソブチルアルコール、エチレングリコール、プロピレングリコール等のアルコール系有機溶剤;アセトン、メチルエチルケトン、メチルイソブチルケトン、シクロヘキサノン等のケトン系有機溶剤;ジエチルエーテル、ジオキサン、テトラヒドロフラン等のエーテル系有機溶剤、;ジクロロメタン、四塩化炭素、トリクロロエチレン、テトラクロロエチレン等の塩素系有機溶剤;水等の無機溶剤等が挙げられる。これらの溶剤(又は分散媒)は、単独又は2種以上を混合して使用できる。   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 Inorganic solvents and the like, such as water; chlorinated organic solvents. These solvents (or dispersion media) can be used alone or in admixture of two or more.

絵柄模様層の形成に用いる印刷法としては、例えば、グラビア印刷法、オフセット印刷法、スクリーン印刷法、フレキソ印刷法、静電印刷法、インクジェット印刷法等が挙げられる。また、全面ベタ状の絵柄模様層を形成する場合には、例えば、ロールコート法、ナイフコート法、エアーナイフコート法、ダイコート法、リップコート法、コンマコート法、キスコート法、フローコート法、ディップコート法等の各種コーティング法が挙げられる。その他、手描き法、墨流し法、写真法、転写法、レーザービーム描画法、電子ビーム描画法、金属等の部分蒸着法、エッチング法等を用いたり、他の形成方法と組み合わせて用いたりしてもよい。   Examples of the printing method used for forming the pattern layer include a gravure printing method, an offset printing method, a screen printing method, a flexographic printing method, an electrostatic printing method, and an inkjet printing method. When forming a solid pattern pattern layer, for example, roll coating method, knife coating method, air knife coating method, die coating method, lip coating method, comma coating method, kiss coating method, flow coating method, dip coating Various coating methods such as a coating method may be mentioned. In addition, the hand-drawn method, the ink-sink method, the photographic method, the transfer method, the laser beam drawing method, the electron beam drawing method, the metal partial evaporation method, the etching method, etc. may be used or combined with other forming methods. Good.

絵柄模様層を形成する場合には、前記した電子線照射による樹脂架橋の後に行うことが好ましい。   In the case of forming the pattern layer, it is preferably performed after the resin crosslinking by the electron beam irradiation.

絵柄模様層の厚みは特に限定されず、製品特性に応じて適宜設定できるが、塗工時の層厚は1〜15μm程度、乾燥後の層厚は0.1〜10μm程度である。   The thickness of the pattern layer is not particularly limited and can be set as appropriate according to product characteristics. The layer thickness at the time of coating is about 1 to 15 μm, and the layer thickness after drying is about 0.1 to 10 μm.

エンボス
本発明の発泡壁紙は、発泡により生じるエンボス模様に加えて、任意にエンボス模様が付与されていてもよい。即ち、非発泡樹脂層(絵柄模様層を形成する場合には、絵柄模様層)から発泡樹脂層に達する任意の凹凸模様を有していてもよい。
Embossing The foamed wallpaper of the present invention may optionally be provided with an embossed pattern in addition to the embossed pattern generated by foaming. That is, you may have the arbitrary uneven | corrugated pattern which reaches a foamed resin layer from a non-foamed resin layer (a pattern pattern layer when forming a pattern pattern layer).

通常は、凹凸模様はエンボス加工により付与する。エンボス加工方法は特に限定されず、例えば、非発泡樹脂層のおもて面を加熱軟化させてエンボス版により加圧・賦形後、冷却する方法が好ましい方法として挙げられる。エンボス加工には、公知の枚葉式又は輪転式のエンボス機が用いられる。凹凸形状としては、例えば、木目板導管溝、石板表面凹凸(花崗岩劈開面等)、布表面テクスチャア、梨地、砂目、ヘアライン、万線条溝等がある。   Usually, the concavo-convex pattern is applied by embossing. The embossing method is not particularly limited. For example, a preferable method is to heat soften the front surface of the non-foamed resin layer, pressurize and shape with an embossing plate, and then cool. For embossing, a known single-wafer or rotary embossing machine is used. Examples of the concavo-convex shape include a wood grain plate conduit groove, a stone plate surface unevenness (such as granite cleaved surface), a cloth surface texture, a satin texture, a grain, a hairline, a ridge line, and the like.

本発明の発泡壁紙は、発泡樹脂層及び非発泡樹脂層を構成する樹脂が同じであるため、発泡壁紙のカールが抑制されており、壁紙施工が容易である。また、発泡樹脂層及び非発泡樹脂層を構成する樹脂がいずれも架橋されており、しかも発泡樹脂層よりも非発泡樹脂層の方が大きな架橋密度を有するため、発泡壁紙表面の耐スクラッチ性が高い。   In the foamed wallpaper of the present invention, since the resin constituting the foamed resin layer and the non-foamed resin layer is the same, curling of the foamed wallpaper is suppressed, and the wallpaper construction is easy. In addition, since the resin constituting the foamed resin layer and the non-foamed resin layer are both cross-linked, and the non-foamed resin layer has a larger cross-linking density than the foamed resin layer, the scratch resistance of the foamed wallpaper surface is improved. high.

さらに、本発明の発泡壁紙は、発泡樹脂層及び非発泡樹脂層を構成する樹脂が同じであり両層の温度特性が同等であるため、各層を形成するための組成物を同時押出しすることにより紙質基材上に両層を容易に同時形成できる。   Furthermore, since the foamed wallpaper of the present invention has the same resin constituting the foamed resin layer and the non-foamed resin layer, and the temperature characteristics of both layers are equivalent, by coextruding the composition for forming each layer Both layers can be easily and simultaneously formed on a paper-based substrate.

以下に実施例及び比較例を示し、本発明をより具体的に説明する。但し、本発明は実施例に限定されない。   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.

実施例1
エチレン−酢酸ビニル共重合体樹脂(190℃におけるMFR:70g/10分、酢酸ビニル含有量:20重量%)に無機充填剤、顔料、熱分解型発泡剤、セル調整剤及び架橋助剤を配合したものを発泡樹脂層形成用組成物とし、上記と同じエチレン−酢酸ビニル共重合体樹脂に無機充填剤及び架橋助剤を配合したものを非発泡樹脂層形成用組成物として、厚さ110μmの裏打ち紙上に110μm厚みの多層シート(非発泡樹脂層/発泡樹脂層=10μm/100μm)を多層(2層)同時押出しにより形成した。発泡樹脂層の組成を下記表1に示す。非発泡樹脂層の組成を下記表2に示す。
Example 1
Blended with ethylene-vinyl acetate copolymer resin (MFR at 190 ° C .: 70 g / 10 min, vinyl acetate content: 20% by weight) with inorganic filler, pigment, pyrolytic foaming agent, cell conditioner and crosslinking aid The foamed resin layer-forming composition, and the same ethylene-vinyl acetate copolymer resin as described above blended with an inorganic filler and a crosslinking aid were used as the non-foamed resin layer-forming composition with a thickness of 110 μm. A multilayer sheet (non-foamed resin layer / foamed resin layer = 10 μm / 100 μm) having a thickness of 110 μm was formed on the backing paper by multilayer (two-layer) coextrusion. The composition of the foamed resin layer is shown in Table 1 below. The composition of the non-foamed resin layer is shown in Table 2 below.

次いで、多層シート側から175kVの電子線を3Mrad照射してエチレン−酢酸ビニル共重合体樹脂の樹脂架橋を行った。発泡樹脂層及び非発泡樹脂層はいずれも樹脂架橋しており、架橋密度は非発泡樹脂層の方が大きかった。   Subsequently, the resin-crosslinking of the ethylene-vinyl acetate copolymer resin was performed by irradiating an electron beam of 175 kV from the multilayer sheet side with 3 Mrad. Both the foamed resin layer and the non-foamed resin layer were resin-crosslinked, and the non-foamed resin layer had a higher crosslinking density.

次いで、多層シート表面に絵柄模様層を形成後、加熱発泡及びエンボス加工を経て発泡壁紙を作製した。   Next, after a pattern layer was formed on the surface of the multilayer sheet, a foamed wallpaper was prepared through heat foaming and embossing.

Figure 2006097247
Figure 2006097247

Figure 2006097247
Figure 2006097247

実施例2
発泡樹脂層及び非発泡樹脂層のいずれにも架橋助剤を含まない以外は、実施例1と同様にして壁紙を作製した。発泡樹脂層及び非発泡樹脂層はいずれも樹脂架橋しており、架橋密度は非発泡樹脂層の方が大きかった。
Example 2
A wallpaper was prepared in the same manner as in Example 1 except that neither the foamed resin layer nor the non-foamed resin layer contained a crosslinking aid. Both the foamed resin layer and the non-foamed resin layer were resin-crosslinked, and the non-foamed resin layer had a higher crosslinking density.

比較例1
表1から架橋助剤を抜いたものを発泡樹脂層の組成とし、表2のエチレン−酢酸ビニル共重合体樹脂のみを非発泡樹脂層の組成とし、厚さ110μmの裏打ち紙上に110μm厚みの多層シート(非発泡樹脂層/発泡樹脂層=10μm/100μm)を多層(2層)同時押出しにより形成した。
Comparative Example 1
The composition obtained by removing the crosslinking aid from Table 1 is the composition of the foamed resin layer, and only the ethylene-vinyl acetate copolymer resin of Table 2 is the composition of the non-foamed resin layer, and the 110 μm thick multilayer on the 110 μm thick backing paper. A sheet (non-foamed resin layer / foamed resin layer = 10 μm / 100 μm) was formed by multilayer (two-layer) coextrusion.

次いで、樹脂架橋を経ずに多層シート表面に絵柄模様層を形成後、加熱発泡及びエンボス加工を経て発泡壁紙を作製した。   Then, after forming a pattern layer on the surface of the multilayer sheet without undergoing resin crosslinking, a foamed wallpaper was produced through heat foaming and embossing.

比較例2
非発泡樹脂層を厚さ15μmのアクリル樹脂フィルムとし、多層シート全体の厚みを115μmとした以外は、比較例1と同様にして発泡壁紙を作製した。
Comparative Example 2
A foamed wallpaper was prepared in the same manner as in Comparative Example 1 except that the non-foamed resin layer was an acrylic resin film having a thickness of 15 μm and the thickness of the entire multilayer sheet was 115 μm.

試験例1
実施例及び比較例で作製した壁紙の特性(カールの有無、耐スクラッチ性及び発泡樹脂層外観)を調べた。
(カールの有無)
肉眼観察によりカールの有無を調べた。
(耐スクラッチ性)
日本ビニル工業会建築部会制定の「表面強化商品性能表示規定」に準拠して発泡壁紙の耐スクラッチ性を調べた。耐スクラッチ性の評価は、◎:最良、○:良好、△:やや悪い、×:悪い、とした。
(発泡樹脂層外観)
肉眼観察により発泡樹脂層外観を調べた。具体的には、微細な独立気泡の形成の有無により評価し、微細な独立気泡が全域にわたり形成される場合を○とし、気泡が独立せず大きくなる場合、気泡のない領域が確認される場合を×とした。
Test example 1
The characteristics (presence / absence of curling, scratch resistance, and appearance of the foamed resin layer) of the wallpaper produced in Examples and Comparative Examples were examined.
(With or without curl)
The presence or absence of curl was examined by visual observation.
(Scratch resistance)
The scratch resistance of foamed wallpaper was examined in accordance with the “Surface-Enhanced Product Performance Labeling Regulations” established by the Japan Vinyl Industry Association Building Committee. The scratch resistance was evaluated as ◎: best, :: good, △: somewhat bad, x: bad.
(Foamed resin layer appearance)
The appearance of the foamed resin layer was examined by visual observation. Specifically, the evaluation is based on the presence or absence of the formation of fine closed cells, and the case where fine closed cells are formed over the entire area is marked as ◯. Was marked with x.

これらの調査結果を下記表3に示す。   The results of these investigations are shown in Table 3 below.

Figure 2006097247
Figure 2006097247

Claims (8)

紙質基材上に発泡樹脂層及び非発泡樹脂層が順に積層されている発泡壁紙であって、
(1)発泡樹脂層及び非発泡樹脂層を構成する樹脂が同じであり、
(2)発泡樹脂層及び非発泡樹脂層を構成する樹脂がいずれも架橋されており、
(3)発泡樹脂層よりも非発泡樹脂層の方が大きな架橋密度を有する
ことを特徴とする発泡壁紙。
A foam wallpaper in which a foam resin layer and a non-foam resin layer are sequentially laminated on a paper base material,
(1) The resins constituting the foamed resin layer and the non-foamed resin layer are the same,
(2) The resins constituting the foamed resin layer and the non-foamed resin layer are both crosslinked,
(3) A foamed wallpaper characterized in that the non-foamed resin layer has a higher crosslinking density than the foamed resin layer.
発泡樹脂層及び非発泡樹脂層を構成する樹脂がオレフィン系共重合体樹脂である請求項1記載の発泡壁紙。   The foamed wallpaper according to claim 1, wherein the resin constituting the foamed resin layer and the non-foamed resin layer is an olefin copolymer resin. 発泡樹脂層及び非発泡樹脂層を構成する樹脂がエチレン−酢酸ビニル共重合体樹脂、エチレン−メチルアクリレート共重合体樹脂、エチレン−エチルアクリレート共重合体樹脂、炭素数3〜5のエチレン−アルキルアクリレート共重合体樹脂又はエチレン−メチルメタクリレート共重合体樹脂である請求項1又は2に記載の発泡壁紙。   The resin constituting the foamed resin layer and the non-foamed resin layer is an ethylene-vinyl acetate copolymer resin, an ethylene-methyl acrylate copolymer resin, an ethylene-ethyl acrylate copolymer resin, or an ethylene-alkyl acrylate having 3 to 5 carbon atoms. The foamed wallpaper according to claim 1, which is a copolymer resin or an ethylene-methyl methacrylate copolymer resin. 発泡樹脂層及び非発泡樹脂層を構成する樹脂がエチレン−酢酸ビニル共重合体樹脂であり、該樹脂の酢酸ビニル含有量が10〜30重量%である請求項1〜3のいずれかに記載の発泡壁紙。   The resin constituting the foamed resin layer and the non-foamed resin layer is an ethylene-vinyl acetate copolymer resin, and the vinyl acetate content of the resin is 10 to 30% by weight. Foam wallpaper. 少なくとも非発泡樹脂層が無機質充填剤を含有する請求項1〜4のいずれかに記載の発泡壁紙。   The foamed wallpaper according to any one of claims 1 to 4, wherein at least the non-foamed resin layer contains an inorganic filler. 少なくとも非発泡樹脂層が電子線照射による樹脂架橋を促進する架橋助剤を含有する請求項1〜5のいずれかに記載の発泡壁紙。   The foamed wallpaper according to any one of claims 1 to 5, wherein at least the non-foamed resin layer contains a crosslinking aid that promotes resin crosslinking by electron beam irradiation. 発泡樹脂層及び非発泡樹脂層が多層同時押出し法により形成されている請求項1〜6のいずれかに記載の発泡壁紙。   The foamed wallpaper according to any one of claims 1 to 6, wherein the foamed resin layer and the non-foamed resin layer are formed by a multilayer coextrusion method. 非発泡樹脂層から発泡樹脂層に達する凹凸模様を有する請求項1〜7のいずれかに記載の発泡壁紙。
The foamed wallpaper according to any one of claims 1 to 7, wherein the wallpaper has an uneven pattern reaching the foamed resin layer from the non-foamed resin layer.
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JPH06270314A (en) * 1993-03-18 1994-09-27 Toppan Printing Co Ltd Foamable wall paper with uneven part and manufacture thereof
JPH10193538A (en) * 1997-01-17 1998-07-28 Dainippon Printing Co Ltd Wall paper
JPH10296894A (en) * 1997-04-25 1998-11-10 Toppan Printing Co Ltd Foam wall-paper and its manufacture
JPH1199591A (en) * 1997-09-26 1999-04-13 Toppan Printing Co Ltd Decoration paper
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JP2002059522A (en) * 2000-08-22 2002-02-26 Dainippon Printing Co Ltd Decorative sheet
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JP2002363354A (en) * 2001-06-08 2002-12-18 Du Pont Mitsui Polychem Co Ltd Resin composition excellent in roll processability and calendering processability

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