JP3843547B2

JP3843547B2 - Long flooring

Info

Publication number: JP3843547B2
Application number: JP22072597A
Authority: JP
Inventors: 学方宋; 隆佛田; 忠征森川
Original assignee: Takiron Co Ltd
Current assignee: Takiron Co Ltd
Priority date: 1997-07-31
Filing date: 1997-07-31
Publication date: 2006-11-08
Anticipated expiration: 2017-07-31
Also published as: JPH1148416A

Description

【０００１】
【発明の属する技術分野】
本発明は、耐傷性、耐汚れ性、耐凹み性、柔軟性などの諸物性を総合的に改善したポリオレフィン系の長尺床材に関する。
【０００２】
【従来の技術】
従来より、ビルやマンションのフローリングには、塩化ビニル樹脂製の床材が多用されている。しかし、塩化ビニル樹脂製の床材は、火災時に有害な塩化水素ガスを含んだ煙を多量に発生するため、人体に悪影響を及ぼし、避難行動や消火活動を妨げるという問題がある。また、可塑剤や安定剤を多量に含むため、臭気が強いという問題もある。
【０００３】
そこで、本発明者らはハロゲンを含まないポリプロピレンに注目し、ポリプロピレンにエチレン−酢酸ビニル共重合体と炭酸カルシウム等を配合して成る床材を提案した（特願平５−２９６１５４号）。
【０００４】
この床材は、エチレン−酢酸ビニル共重合体を配合しているため、それまでのポリプロピレン製の床材に見られたような脆さがないといった利点を有し、耐汚れ性や耐傷性もある程度は改善されるという利点を有するものであった。
【０００５】
【発明が解決しようとする課題】
しかしながら、上記のポリプロピレン製の床材のようにエチレン−酢酸ビニル共重合体を配合するだけでは、床材に要求される耐汚れ性、耐傷性、柔軟性などの諸物性を充分に改善できないという問題があった。
【０００６】
本発明は上記の問題に鑑みてなされたもので、耐汚れ性、耐傷性、耐凹み性、柔軟性などの諸物性を改善したポリオレフィン系の長尺床材を提供することを目的としている。
【０００７】
【課題を解決するための手段】
前記目的を達成するため、本発明の請求項１に係る長尺床材は上地層と下地層を有する長尺床材であって、上地層は、３０〜７０重量部のポリオレフィンに、エチレン−酢酸ビニル共重合体を６９〜５重量部、メタクリル酸、無水マレイン酸、アクリル酸のいずれかで変性されたオレフィン系樹脂を１〜２５重量部、無機質充填材を５０〜３００重量部の割合で配合して成る層であり、下地層は、２５〜７０重量部のポリオレフィンに、エチレン−酢酸ビニル共重合体を７４〜１５重量部、上記の変性オレフィン系樹脂を１〜１５重量部、無機質充填材を５０〜３００重量部の割合で配合して成る層であることを特徴とする。
【０００８】
そして、請求項２に係る長尺床材は、上記請求項１の長尺床材において、ポリオレフィンが低密度ポリエチレンであることを特徴とし、
請求項３に係る長尺床材は、上記請求項１又は請求項２の長尺床材において、上地層の表面に、該上地層よりも耐汚れ性及び耐傷性の良好な樹脂膜が形成されていることを特徴とし、
請求項４に係る長尺床材は、請求項３の長尺床材において、樹脂膜が、紫外線硬化型樹脂塗料、エマルジョン樹脂塗料、水性樹脂塗料のいずれかの塗膜であることを特徴とし、
請求項５に係る長尺床材は、上記請求項３又は請求項４の長尺床材において、上地層の表面がコロナ放電処理もしくはプラズマ放電処理もしくは電子線照射処理されていることを特徴とするものである。
【０００９】
請求項１の長尺床材は、エチレン−酢酸ビニル共重合体を上地層に６９〜５重量部、下地層に７４〜１５重量部の割合で配合して、ポリオレフィン系床材の脆さを改善すると共に、更に、メタクリル酸、無水マレイン酸、アクリル酸のいずれかで変性された変性オレフィン系樹脂を上地層に１〜２５重量部、下地層に１〜１５重量部の割合で配合して、上地層及び下地層における無機質充填材の混合分散性と相溶性を高めているため、脆さの改善効果が一層顕著である。しかも、上記の変性オレフィン系樹脂を配合すると、耐汚れ性、耐傷性、耐凹み性が向上して良質の長尺床材となる。
【００１０】
材料のポリオレフィンとしては、請求項２の長尺床材に用いる低密度ポリエチレンが最適であり、かかる低密度ポリエチレンはエチレン−酢酸ビニル共重合体や上記の変性オレフィン系樹脂との相溶性に富み、良く調和するため、成形性、生産性等が向上する。低密度ポリエチレンの配合量の上限は、上地層においても下地層においても７０重量部であり、これより多量に配合すると、長尺床材に必要な柔軟性が低下するので好ましくない。また、低密度ポリエチレンの配合量の下限は、上地層において３０重量部、下地層において２５重量部であた、これより少なくなると、耐汚れ性や耐凹み性が低下するので好ましくない。
【００１１】
なお、無機質充填材の配合量は、上地層においても下地層においても５０〜３００重量部の範囲であり、これより多くなると長尺床材が脆弱化し、少なくなると床材の難燃性と寸法安定性が低下するといった不都合を生じる。
【００１２】
また、請求項３の長尺床材のように、上地層の表面に、該上地層よりも耐汚れ性及び耐傷性の良好な樹脂膜が形成されていると、長尺床材の耐汚れ性及び耐傷性が上記の樹脂膜によって一層向上することになる。かかる樹脂膜としては、請求項４の長尺床材に用いられるような紫外線硬化型樹脂塗料、エマルジョン樹脂塗料、水性樹脂塗料などの塗膜が好適である。
【００１３】
更に、請求項５の長尺床材のように、上地層の表面がコロナ放電処理もしくはプラズマ放電処理もしくは電子線照射処理されると、これらの処理によって上地層の表面が適度に肌荒れするため、この表面に形成された樹脂膜の接着性が大幅に向上して剥離の恐れが皆無に等しくなる。
【００１４】
【発明の実施の形態】
以下、図面を参照しながら本発明の具体的な実施形態を詳述する。
【００１５】
図１は本発明の一実施形態に係る長尺床材の概略断面図であって、下地層２の上に上地層１を積層一体化した２層構造の長尺床材を示している。
【００１６】
この上地層１は、３０〜７０重量部のポリオレフィンに、エチレン−酢酸ビニル共重合体を６９〜５重量部、メタクリル酸、無水マレイン酸、アクリル酸のいずれかで変性された変性オレフィン系樹脂、又は、メタクリル酸、無水マレイン酸、アクリル酸、アクリル酸エステルのいずれかとオレフィンとの二元もしくは三元共重合樹脂を１〜２５重量部、無機質充填材を５０〜３００重量部の割合で配合して成る層であり、その好ましい厚みは０．５〜１．５ｍｍ程度であるが、特に限定されるものではない。
【００１７】
また、下地層２は、２５〜７０重量部のポリオレフィンに、エチレン−酢酸ビニル共重合体を７４〜１５重量部、上記の変性オレフィン系樹脂又は二元もしくは三元共重合樹脂を１〜１５重量部、無機質充填材を５０〜３００重量部の割合で配合して成る層であり、その好ましい厚みは０．５〜１．５ｍｍ程度であるが、特に限定されるものではない。
【００１８】
上地層１及び下地層２の主成分樹脂であるポリオレフィンとしては、ポリエチレンやポリプロピレン等が使用されるが、その中でも低密度ポリエチレン（比重０．９３以下のもの）が好適に使用される。かかる低密度ポリエチレンは、他の改質用の樹脂であるエチレン−酢酸ビニル共重合体や、前記の変性オレフィン系樹脂又は二元もしくは三元共重合樹脂との相溶性に富んで良く調和するため、成形性や生産性の向上を図ることができる。
【００１９】
低密度ポリエチレンの配合量の上限は、上地層１においても下地層２においても７０重量部であり、これより多量に配合すると、長尺床材に要求される柔軟性が低下するので好ましくない。また、低密度ポリエチレンの配合量の下限は、上地層において３０重量部、下地層において２５重量部であり、これより少なくすると、耐汚れ性や耐凹み性が低下するので好ましくない。
【００２０】
改質用の樹脂であるエチレン−酢酸ビニル共重合体（以下、ＥＶＡと記す）としては、酢酸ビニル含有率が１５〜７０重量％の範囲にある比較的軟質のＥＶＡが好適に使用され、このようなＥＶＡは柔軟性などの改善に有効に作用する。
【００２１】
ＥＶＡの配合量の上限は、上地層１において６９重量部、下地層２において７４重量部であり、これらの上限を越えると、耐汚れ性や耐凹み性が低下するので好ましくない。また、ＥＶＡの配合量の下限は、上地層１において５重量部、下地層２において１５重量部であり、これらの下限を下回ると、長尺床材に必要な柔軟性が低下するので好ましくない。
【００２２】
もう一つの改質用樹脂である前記の変性オレフィン系樹脂としては、メタクリル酸、無水マレイン酸、アクリル酸のいずれかで変性された低密度ポリエチレン、高密度ポリエチレン、ポリプロピレン、ＥＶＡなどが使用され、同じく改質用の共重合樹脂としては、メタクリル酸、無水マレイン酸、アクリル酸、アクリル酸エステルのいずれかとオレフィンとの二元もしくは三元共重合樹脂が使用される。特に、無水マレイン酸で変性された低（高）密度ポリエチレンやエチレン−アクリル酸エステル共重合体は好適に使用される。
【００２３】
かかる変性オレフィン系樹脂や共重合樹脂は、耐汚れ性、耐傷性、耐凹み性を改善するのに有効であり、また、前記のＥＶＡと共に無機質充填材の混合分散性と相溶性を高めて脆さを改善するのにも有効なものである。
【００２４】
上記の変性オレフィン系樹脂又は二元もしくは三元共重合樹脂の配合量の上限は、上地層１において２５重量部、下地層２において１５重量部であり、これらの上限を越えて多量に配合しても、それに見合うだけの顕著な改質効果の向上が期待できず、却って材料の無駄使いとなる。また、変性オレフィン系樹脂又は二元もしくは三元共重合樹脂の配合量の下限は、上地層１においても下地層２においても１重量部であり、これより少ないと上記の改質効果を得ることは困難となる。
【００２５】
前記の無機質充填材としては、従来公知の種々の充填材を使用できるが、その中でも１０μｍ以下の平均粒径を有する炭酸カルシウムの粉末や、この炭酸カルシウム粉末と水酸化アルミニウム粉末との混合粉末や、これらの粉末を表面処理したものが好適に使用される。炭酸カルシウム粉末を配合するだけでも長尺床材に難燃性を付与することはできるが、炭酸カルシウム粉末と水酸化アルミニウム粉末との混合粉末を配合すると、水酸化アルミニウムが熱分解時に水を放出するため、難燃性の高い長尺床材を得ることができる。
【００２６】
かかる無機質充填材の配合量の上限は、上地層１においても下地層２においても３００重量部であり、この上限を越えると長尺床材が脆弱化するので好ましくない。また、無機質充填材の配合量の下限は、上地層１においても下地層２においても５０重量部であり、この下限を下回ると床材の難燃性と寸法安定性が低下するといった不都合を生じるので好ましくない。
【００２７】
尚、上記の上地層１や下地層２には、必要に応じて顔料、過酸化系の架橋剤、カップリング剤、ビスアマイド等の滑剤、フェノール系の酸化防止剤、ヒンダードアミン系の光安定剤など、各種の添加剤を少量含有させてもよい。また、床地面に対する接着性を向上させるために、下地層２にロジンを１〜１５重量部の割合で配合したり、下地層２の下面に寒冷紗、不織布、織布、ガラス繊維、紙等の種々の繊維層（不図示）を熱圧着したり、接着性の良好なプライマー層（不図示）を形成してもよい。
【００２８】
以上のような上地層１と下地層２からなる長尺床材は、例えば次の方法によって製造することができる。
【００２９】
まず、３０〜７０重量部のポリオレフィンと、６９〜５重量部のＥＶＡと、１〜２５重量部の変性オレフィン系樹脂又は共重合樹脂と、５０〜３００重量部の無機質充填材と、必要に応じて少量の添加剤とを混合し、押出機で造粒して粉粒体を造る。
【００３０】
一方、２５〜７０重量部のポリオレフィンと、７４〜１５重量部のＥＶＡと、１〜１５重量部の変性オレフィン系樹脂又は共重合樹脂と、５０〜３００重量部の無機質充填材と、必要に応じて１〜１５重量部のロジン及び少量の添加剤を混合し、押出機でシーティングして、下地層２となる長尺シートを造る。
【００３１】
そして、この長尺シートの上に前記の粉粒体を積層して加熱し、加圧ロール等で加圧一体化して長尺床材を製造する。尚、裏面に寒冷紗等の繊維層を設ける場合は、長尺シートの下側に寒冷紗等を重ねて加圧ロール等で同時に圧着すればよい。
【００３２】
図２は本発明の他の実施形態に係る長尺床材の概略断面図である。
【００３３】
この長尺床材は、下地層２の上に上地層１を積層一体化し、この上地層１の表面に、上地層１よりも耐汚れ性及び耐傷性の良好な樹脂膜３を形成したものである。この樹脂膜３は紫外線硬化型樹脂塗料、エマルジョン樹脂塗料、水性樹脂塗料のいずれかの塗膜であって、０．０１〜０．１ｍｍ程度の膜厚を有するものである。
【００３４】
樹脂膜３の形成に好ましい紫外線硬化型樹脂塗料としては、ウレタン系紫外線硬化型樹脂塗料、エステル系紫外線硬化型樹脂塗料、アクリル系紫外線硬化型樹脂塗料、エポキシ系紫外線硬化型樹脂塗料、ジエン系紫外線硬化型樹脂塗料、シリコン系紫外線硬化型樹脂塗料などが挙げられ、好ましいエマルジョン樹脂塗料としては、酢酸ビニル系エマルジョン樹脂塗料、アクリル系エマルジョン樹脂塗料、エポキシ系エマルジョン樹脂塗料、ウレタン系エマルジョン樹脂塗料、エステル系エマルジョン樹脂塗料、ジエン系エマルジョン樹脂塗料などが挙げられ、好ましい水性樹脂塗料としては、水性アクリル系樹脂塗料、水性エポキシ系樹脂塗料、水性ウレタン系樹脂塗料、水性エステル系樹脂塗料、水性ジエン系樹脂塗料などが挙げられる。
【００３５】
上記のような樹脂膜３を上地層１の表面に形成すると、上地層１が露出した図１に示す実施形態の長尺床材よりも耐汚れ性や耐傷性が更に向上する。特に、上記の紫外線硬化型樹脂塗料を塗布して樹脂膜３を形成すると、耐汚れ性や耐傷性の向上が顕著であり、また、樹脂膜３によって耐水性や耐溶剤性が向上する利点もあるので極めて好ましい。
【００３６】
また、この実施形態の長尺床材では、上地層１の表面１ａにコロナ放電処理もしくはプラズマ放電処理もしくは電子線照射処理を施して適度に肌荒れさせている。このような処理を施すと、上地層１と樹脂膜３との接着性が向上し、樹脂膜３の剥離を防止できる利点があるので好ましい。尚、処理後、時間がたってから樹脂膜３を形成すると、接着性が顕著に向上しなくなるので、処理後すぐに樹脂膜３を形成することが大切である。
【００３７】
コロナ放電処理は、温度０〜５０℃、放電密度３００〜１６００ｗ／ｍ² ／ｍｉｎの条件下に行うことが望ましく、プラズマ放電処理は、大気中で電界強度５〜９０ｋＶ／ｃｍ、処理時間１〜１８０秒の条件下に行うことが望ましく、電子線照射処理は、加速電圧３００〜１０００ｋＶ、照射線量１〜３０Ｍｒａｄの条件下に行うことが望ましい。
【００３８】
尚、上地層１及び下地層２は、既述した図１の長尺床材の上地層１及び下地層２と同様であるので、説明を省略する。また、この実施形態の長尺床材においても、上地層１や下地層２に各種の添加剤を少量含有させたり、床地面に対する接着性を向上させるために、下地層２にロジンを配合したり、繊維層を圧着したり、接着性の良好なプライマー層を形成することができる。
【００３９】
【実施例】
次に、本発明の長尺床材の更に具体的な実施例と比較例を説明する。
【００４０】
［実施例１］
６０重量部の低密度ポリエチレン（東ソー（株）製の３４２）に、酢酸ビニル含有率が２８重量％のＥＶＡ（三井デュポンケミカル（株）製のＥＶ２６０）を２０重量部、エチレン−無水マレイン酸−アクリル酸エステル三元共重合樹脂（住友化学工業（株）製のボンダインＨ×８１４０）を２０重量部、平均粒径が３μｍの炭酸カルシウム粉末を１５０重量部の割合で均一に混練して押出機から押出し、これを粉砕して３ｍｍ以下の粒径を有する粉粒体を得た。
【００４１】
一方、５５重量部の上記の低密度ポリエチレンに、上記のＥＶＡを４０重量部、上記の三元共重合樹脂を５重量部、ロジンを５重量部、上記の炭酸カルシウム粉末を１５０重量部の割合で均一に混練し、押出機でシーティングして下地層となる長尺シート（厚さ１ｍｍ）を形成した。
【００４２】
そして、この長尺シートの上に上記の粉粒体を積層して８０℃に加熱し、これをプレスして厚さ２ｍｍの長尺床材を作製した。
【００４３】
この長尺床材について、▲１▼耐汚れ性、▲２▼耐傷性、▲３▼残留凹み、▲４▼柔軟性を次の要領で調べた。
【００４４】
▲１▼耐汚れ性（色差）
長尺床材を切断したサンプルの表面に、ＪＩＳＬ１０２３に準じる標準汚染物質を落としながら、ＪＩＳＡ１４５３の方法に準じて、研磨紙を巻き付けないゴム輪でサンプルの表面を８０回研磨し、更に、汚染物質を落とすのをやめて上記ゴム輪で２０回研磨した。そして、ＪＩＳＫ７１０５の色差測定法によって、上記の汚れたサンプルと、汚れのない元のサンプルとの色差（ΔＥ）を求めた。その結果、色差は下記の表１に示すように僅か５．２１％であり、優れた耐汚れ性を有していた。
【００４５】
▲２▼耐傷性
長尺床材を切断したサンプルについて、ＪＩＳＫ５４００の手書き法によって表面の鉛筆硬度を測定した。その結果、下記の表１に示すように表面の鉛筆硬度は３Ｈであり、良好な耐傷性を有していた。
【００４６】
▲３▼残留凹み
長尺床材を切断したサンプルについて、ＪＩＳＡ５７０５の残留凹みの試験方法で残留凹みを調べた。その結果、下記の表１に示すように残留凹みは僅か３．４％であり、優れた耐凹み性を有していた。
【００４７】
▲４▼柔軟性
長尺床材を幅５ｃｍ、長さ２５ｃｍの帯状に切断して、多数のサンプルを作製し、室温２０℃において、直径が異なる複数のパイプに上記のサンプルを巻き付ける操作を３回ずつ繰り返し、３回ともサンプルにひび割れが生じない最小直径のパイプを調べて、そのパイプの直径の大小から柔軟性の良否を判断した。その結果、サンプルにひび割れが生じない最小のパイプの直径は、下記の表１に示すように６ｍｍ以下であり、優れた柔軟性を有していた。
【００４８】
［実施例２］
実施例１で使用した低密度ポリエチレン５０重量部に、実施例１で使用したＥＶＡを４０重量部、実施例１で使用した三元共重合樹脂を１０重量部、実施例１で使用した炭酸カルシウム粉末を１５０重量部の割合で均一に混練して押出機から押出し、これを粉砕して粒径が３ｍｍ以下の粉粒体を得た。
【００４９】
そして、実施例１と同様に成形した厚さ１ｍｍの長尺シートの上に、上記の粉粒体を積層し、実施例１と同じ温度及び同じ圧力で加熱プレスして、厚さ２ｍｍの長尺床材を作製した。
【００５０】
この長尺床材を切断したサンプルについて、実施例１と同様にして▲１▼耐汚れ性（色差）、▲２▼耐傷性、▲３▼残留凹み、▲４▼柔軟性を調べた。その結果を下記の表１に示す。
【００５１】
［実施例３］
実施例１で使用した低密度ポリエチレン４０重量部に、実施例１で使用したＥＶＡを５５重量部、実施例１で使用した三元共重合樹脂を５重量部、実施例１で使用した炭酸カルシウム粉末を１５０重量部の割合で均一に混練して押出機から押出し、これを粉砕して粒径が３ｍｍ以下の粉粒体を得た。
【００５２】
そして、実施例１と同様にして成形した厚さ１ｍｍの長尺シートの上に、上記の粉粒体を積層し、実施例１と同じ温度及び同じ圧力で加熱、プレスして、厚さ２ｍｍの長尺床材を作製した。
【００５３】
この長尺床材を切断したサンプルについて、実施例１と同様にして▲１▼耐汚れ性（色差）、▲２▼耐傷性、▲３▼残留凹み、▲４▼柔軟性を調べた。その結果を下記の表１に示す。
【００５４】
［実施例４］
実施例２で得た長尺床材の表面をコロナ放電処理した後、日本ビーケミカル（株）製のウレタン系紫外線硬化型樹脂塗料を塗布し、紫外線照射により塗膜を硬化させて、膜厚が略０．０３ｍｍのウレタン系樹脂膜を上地層の表面に形成した長尺床材を作製した。
【００５５】
この長尺床材を切断したサンプルについて、実施例１と同様にして▲１▼耐汚れ性（色差）、▲２▼耐傷性、▲３▼残留凹み、▲４▼柔軟性を調べた。その結果を下記の表１に示す。
【００５６】
［実施例５］
実施例２で得た長尺床材の表面をコロナ放電処理した後、大日精化成工業（株）製のアクリル系紫外線硬化型樹脂塗料を塗布し、紫外線照射により塗膜を硬化させて、膜厚が略０．０３ｍｍのアクリル系樹脂膜を上地層の表面に形成した長尺床材を作製した。
【００５７】
この長尺床材を切断したサンプルについて、実施例１と同様にして▲１▼耐汚れ性（色差）、▲２▼耐傷性、▲３▼残留凹み、▲４▼柔軟性を調べた。その結果を下記の表１に示す。
【００５８】
［比較例１〜３］
実施例１で使用した低密度ポリエチレン８０重量部に、実施例１で使用したＥＶＡを２０重量部、実施例１で使用した炭酸カルシウム粉末を１５０重量部の割合で均一に混練して押出機から押出し、これを粉砕して粒径が３ｍｍ以下の粉粒体を得た。そして、実施例１と同様にして成形した厚さ１ｍｍの長尺シートの上に、上記の粉粒体を積層し、実施例１と同じ温度及び同じ圧力で加熱、プレスして、厚さ２ｍｍの比較例１の長尺床材を作製した。
【００５９】
また、実施例１で使用した低密度ポリエチレン８０重量部に、実施例１で使用したＥＶＡを１０重量部、実施例１で使用した三元共重合樹脂を１０重量部、実施例１で使用した炭酸カルシウム粉末を１５０重量部の割合で均一に混練して押出機から押出し、これを粉砕して粒径が３ｍｍ以下の粉粒体を得た。そして、実施例１と同様にして成形した厚さ１ｍｍの長尺シートの上に、上記の粉粒体を積層し、実施例１と同じ温度及び同じ圧力で加熱、プレスして、厚さ２ｍｍの比較例２の長尺床材を作製した。
【００６０】
更に、実施例１で使用した低密度ポリエチレン２０重量部に、実施例１で使用したＥＶＡを７０重量部、実施例１で使用した三元共重合樹脂を１０重量部、実施例１で使用した炭酸カルシウム粉末を１５０重量部の割合で均一に混練して押出機から押出し、これを粉砕して粒径が３ｍｍ以下の粉粒体を得た。そして、実施例１と同様にして成形した厚さ１ｍｍの長尺シートの上に、上記の粉粒体を積層し、実施例１と同じ温度及び同じ圧力で加熱、プレスして、厚さ２ｍｍの比較例３の長尺床材を作製した。
【００６１】
得られた比較例１〜３の長尺床材を切断したそれぞれのサンプルについて、実施例１と同様にして▲１▼耐汚れ性（色差）、▲２▼耐傷性、▲３▼残留凹み、▲４▼柔軟性を調べた。その結果を下記の表１に示す。
【００６２】
【表１】

【００６３】
この表１を見ると、上地層の低密度ポリエチレンの配合量が８０重量部と多い比較例１，２の長尺床材は、残留凹みが３％以下と小さく耐凹み性に優れているけれども、柔軟性の良否を示す最小のパイプ直径が３５〜４０ｍｍと大きく、長尺床材に必要な柔軟性に劣っていることが判る。また、上地層の低密度ポリエチレンの配合量が２０重量部と少なく、ＥＶＡの配合量が７０重量部と多い比較例３の長尺床材は、最小のパイプ直径が６ｍｍ以下で柔軟性に優れているけれども、耐汚れ性（色差）が２４．６１％と悪く、残留凹みも１５．８％と大きいことが判る。
【００６４】
これに対し、実施例１〜３の長尺床材は、柔軟性の良否を示す最小のパイプ直径がいずれも６ｍｍ以下で優れた柔軟性を有している。そして、耐汚れ性（色差）が５．２１〜９．１５％と良好であり、耐傷性も２Ｈ〜３Ｈと良好であり、残留凹みも３．４〜７．１％と小さいことが判る。特に、実施例１〜３を対比すれば、三元共重合樹脂の配合量が多いものほど、耐汚れ性（色差）や耐傷性が良くなり、また、残留凹みが小さくなって耐凹み性が向上していることが判る。このことから、三元共重合樹脂が耐汚れ性、耐傷性、耐凹み性の改善に極めて有効であることが判る。
【００６５】
更に、実施例２の長尺床材の表面にウレタン系とアクリル系の紫外線硬化型樹脂膜をそれぞれ形成した実施例４，５の長尺床材は、耐汚れ性（色差）も耐傷性も耐凹み性も実施例２の床材より向上しており、紫外線硬化型樹脂膜が耐汚れ性、耐傷性、耐凹み性の改善に極めて有効であることが判る。
【００６６】
【発明の効果】
以上の説明から明らかなように、本発明の長尺床材は、長尺床材に要求される優れた柔軟性を備え、しかも耐汚れ性、耐傷性、耐凹み性などの諸物性を総合的に改善することができるといった顕著な効果を奏し、特に、上地層よりも耐汚れ性及び耐傷性が良好な樹脂膜を上地層の表面に形成した長尺床材は、諸物性の改善効果がより一層顕著となる。
【図面の簡単な説明】
【図１】本発明の一実施形態に係る長尺床材の概略断面図である。
【図２】本発明の他の実施形態に係る長尺床材の概略断面図である。
【符号の説明】
１上地層
１ａ上地層の表面
２下地層
３樹脂膜[0001]
BACKGROUND OF THE INVENTION
TECHNICAL FIELD The present invention relates to a polyolefin-based long flooring material that has comprehensively improved various physical properties such as scratch resistance, stain resistance, dent resistance, and flexibility.
[0002]
[Prior art]
Conventionally, flooring made of vinyl chloride resin has been frequently used for flooring in buildings and condominiums. However, since the flooring made of vinyl chloride resin generates a large amount of smoke containing harmful hydrogen chloride gas in the event of a fire, it has a problem of adversely affecting the human body and hindering evacuation and fire fighting activities. Moreover, since a plasticizer and a stabilizer are contained in large quantities, there also exists a problem that an odor is strong.
[0003]
Therefore, the present inventors paid attention to polypropylene containing no halogen, and proposed a flooring obtained by blending ethylene-vinyl acetate copolymer and calcium carbonate into polypropylene (Japanese Patent Application No. Hei 5-296154).
[0004]
Since this flooring material contains an ethylene-vinyl acetate copolymer, it has the advantage that it is not brittle as found in previous polypropylene flooring materials, and it also has stain resistance and scratch resistance. It had the advantage of being improved to some extent.
[0005]
[Problems to be solved by the invention]
However, just by blending an ethylene-vinyl acetate copolymer like the above-mentioned polypropylene flooring, it is said that various physical properties such as stain resistance, scratch resistance, and flexibility required for the flooring cannot be sufficiently improved. There was a problem.
[0006]
The present invention has been made in view of the above problems, and an object of the present invention is to provide a polyolefin-based long floor material having improved various physical properties such as stain resistance, scratch resistance, dent resistance, and flexibility.
[0007]
[Means for Solving the Problems]
In order to achieve the above object, the long flooring according to claim 1 of the present invention is a long flooring having an upper layer and a lower layer, and the upper layer is made of ethylene- 69-5 parts by weight of vinyl acetate copolymer, methacrylic acid, maleic acid anhydride, the proportion of 50 to 300 parts by weight to 25 parts by weight, the inorganic filler or in modified olefin resins and acrylic acid in a layer formed by blending, underlayer polyolefin of 25 to 70 parts by weight, the ethylene - 74-15 parts by weight of vinyl acetate copolymer, 1 to 15 parts by weight of the above modified olefin resins, It is a layer formed by blending 50 to 300 parts by weight of an inorganic filler.
[0008]
And the long flooring according to claim 2 is characterized in that, in the long flooring of claim 1, the polyolefin is low density polyethylene,
The long floor material according to claim 3 is the long floor material according to claim 1 or 2, wherein a resin film having better stain resistance and scratch resistance than the upper layer is formed on the surface of the upper layer. It is characterized by being,
The long flooring according to claim 4 is characterized in that, in the long flooring of claim 3, the resin film is a coating film of any one of an ultraviolet curable resin paint, an emulsion resin paint, and an aqueous resin paint. ,
The long floor material according to claim 5 is the long floor material according to claim 3 or claim 4, wherein the surface of the upper layer is subjected to corona discharge treatment, plasma discharge treatment or electron beam irradiation treatment. To do.
[0009]
The long flooring of Claim 1 mix | blends ethylene-vinyl acetate copolymer in the ratio of 69-5 weight part to an upper layer, and 74-15 weight part to a base layer, and the brittleness of a polyolefin-type flooring is made. while improving, further, methacrylic acid, maleic acid anhydride, 1 to 25 parts by weight of modified modified olefin resins in upper base layer with either acrylic acid, in proportions of 1 to 15 parts by weight of the base layer In addition, since the mixed dispersibility and compatibility of the inorganic filler in the upper layer and the lower layer are enhanced, the effect of improving brittleness is more remarkable. Moreover, when blending the above modified olefin resins, stain resistance, and scratch resistance, good quality is improved耐凹viewed properties elongated flooring.
[0010]
The polyolefin material is optimal low-density polyethylene used in long flooring of claim 2, such low density polyethylene is an ethylene - rich in compatibility vinyl acetate copolymer and the above modified olefin resins In order to harmonize well, moldability, productivity, etc. are improved. The upper limit of the amount of the low density polyethylene is 70 parts by weight in both the upper layer and the lower layer, and blending a larger amount than this is not preferable because the flexibility required for the long flooring material is lowered. Further, the lower limit of the blending amount of the low density polyethylene was 30 parts by weight in the upper layer and 25 parts by weight in the base layer. If the amount is less than this, the stain resistance and the dent resistance are undesirably lowered.
[0011]
In addition, the compounding amount of the inorganic filler is in the range of 50 to 300 parts by weight in both the upper layer and the lower layer, and if it exceeds this, the long floor material becomes brittle, and if it decreases, the flame retardancy and dimensions of the floor material are reduced. Inconveniences such as reduced stability occur.
[0012]
Further, when the resin film having better stain resistance and scratch resistance than the upper layer is formed on the surface of the upper layer as in the long floor member of claim 3, the long floor material is more resistant to contamination. Property and scratch resistance are further improved by the resin film. As such a resin film, a coating film such as an ultraviolet curable resin paint, an emulsion resin paint, and an aqueous resin paint used for the long flooring of claim 4 is suitable.
[0013]
Furthermore, when the surface of the upper layer is subjected to corona discharge treatment or plasma discharge treatment or electron beam irradiation treatment as in the case of the long flooring of claim 5, the surface of the upper layer is moderately roughened by these treatments, The adhesion of the resin film formed on the surface is greatly improved, and there is no possibility of peeling.
[0014]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, specific embodiments of the present invention will be described in detail with reference to the drawings.
[0015]
FIG. 1 is a schematic sectional view of a long floor material according to an embodiment of the present invention, and shows a long floor material having a two-layer structure in which an upper layer 1 is laminated and integrated on a base layer 2.
[0016]
The upper layer 1 is a modified olefinic resin modified with 69 to 5 parts by weight of an ethylene-vinyl acetate copolymer, methacrylic acid, maleic anhydride, or acrylic acid to 30 to 70 parts by weight of polyolefin, Alternatively, 1 to 25 parts by weight of a binary or ternary copolymer resin of either methacrylic acid, maleic anhydride, acrylic acid or acrylic ester and an olefin is blended at a ratio of 50 to 300 parts by weight of an inorganic filler. The preferred thickness is about 0.5 to 1.5 mm, but is not particularly limited.
[0017]
The undercoat layer 2 is composed of 25 to 70 parts by weight of polyolefin, 74 to 15 parts by weight of ethylene-vinyl acetate copolymer, and 1 to 15 parts by weight of the modified olefin resin or binary or ternary copolymer resin. Part and an inorganic filler are blended at a ratio of 50 to 300 parts by weight, and the preferred thickness is about 0.5 to 1.5 mm, but is not particularly limited.
[0018]
Polyethylene, polypropylene, or the like is used as the polyolefin that is a main component resin of the upper layer 1 and the lower layer 2, and among these, low density polyethylene (having a specific gravity of 0.93 or less) is preferably used. Such low-density polyethylene is highly compatible with the ethylene-vinyl acetate copolymer, which is another modifying resin, and the modified olefin-based resin or binary or ternary copolymer resin. Therefore, it is possible to improve moldability and productivity.
[0019]
The upper limit of the blending amount of the low density polyethylene is 70 parts by weight in both the upper layer 1 and the ground layer 2, and blending a larger amount than this is not preferable because flexibility required for the long flooring material is lowered. Further, the lower limit of the blending amount of the low density polyethylene is 30 parts by weight in the upper layer and 25 parts by weight in the base layer, and if it is less than this, the stain resistance and the dent resistance are not preferable.
[0020]
As the ethylene-vinyl acetate copolymer (hereinafter referred to as EVA), which is a modifying resin, a relatively soft EVA having a vinyl acetate content of 15 to 70% by weight is preferably used. Such EVA effectively works to improve flexibility and the like.
[0021]
The upper limit of the amount of EVA is 69 parts by weight in the upper layer 1 and 74 parts by weight in the lower layer 2. If these upper limits are exceeded, the stain resistance and dent resistance are undesirably lowered. Further, the lower limit of the amount of EVA is 5 parts by weight in the upper layer 1 and 15 parts by weight in the lower layer 2, and if it falls below these lower limits, the flexibility required for the long flooring material is lowered, which is not preferable. .
[0022]
As the modified olefin resin, which is another modifying resin, low density polyethylene, high density polyethylene, polypropylene, EVA and the like modified with any of methacrylic acid, maleic anhydride, and acrylic acid are used. Similarly, as the copolymer resin for modification, a binary or ternary copolymer resin of any one of methacrylic acid, maleic anhydride, acrylic acid, and acrylic ester and an olefin is used. In particular, low (high) density polyethylene and ethylene-acrylate copolymer modified with maleic anhydride are preferably used.
[0023]
Such a modified olefin resin or copolymer resin is effective in improving the stain resistance, scratch resistance, and dent resistance, and it is brittle by improving the mixing dispersibility and compatibility of the inorganic filler together with the EVA. It is also effective in improving the thickness.
[0024]
The upper limit of the amount of the modified olefin resin or the binary or ternary copolymer resin is 25 parts by weight in the upper layer 1 and 15 parts by weight in the base layer 2, and the upper limit is blended in a large amount exceeding these upper limits. However, it is not possible to expect a significant improvement in the reforming effect commensurate with it, and the material is wasted. In addition, the lower limit of the amount of the modified olefin resin or binary or ternary copolymer resin is 1 part by weight in both the upper layer 1 and the lower layer 2, and if the amount is less than this, the above-described modification effect is obtained. Will be difficult.
[0025]
As the inorganic filler, conventionally known various fillers can be used. Among them, calcium carbonate powder having an average particle diameter of 10 μm or less, mixed powder of this calcium carbonate powder and aluminum hydroxide powder, Those obtained by surface treatment of these powders are preferably used. Combining calcium carbonate powder can add flame retardancy to long flooring, but when mixed with calcium carbonate powder and aluminum hydroxide powder, aluminum hydroxide releases water during thermal decomposition. Therefore, a long flooring material with high flame retardancy can be obtained.
[0026]
The upper limit of the blending amount of the inorganic filler is 300 parts by weight in both the upper layer 1 and the lower layer 2, and if this upper limit is exceeded, the long flooring material becomes brittle. Further, the lower limit of the blending amount of the inorganic filler is 50 parts by weight in both the upper layer 1 and the lower layer 2, and if the lower limit is not reached, the incombustibility and dimensional stability of the flooring are reduced. Therefore, it is not preferable.
[0027]
In addition, the above-described upper layer 1 and underlayer 2 may be provided with a pigment, a peroxide-based crosslinking agent, a coupling agent, a lubricant such as bisamide, a phenol-based antioxidant, a hindered amine-based light stabilizer, and the like as necessary. A small amount of various additives may be contained. Moreover, in order to improve the adhesiveness with respect to the floor ground, rosin is mix | blended in the ratio of 1-15 weight part to the base layer 2, or a cold chill, a nonwoven fabric, a woven fabric, glass fiber, paper, etc. on the lower surface of the base layer 2 Various fiber layers (not shown) may be thermocompression-bonded or a primer layer (not shown) having good adhesion may be formed.
[0028]
The long floor material composed of the upper layer 1 and the lower layer 2 as described above can be manufactured, for example, by the following method.
[0029]
First, 30 to 70 parts by weight of polyolefin, 69 to 5 parts by weight of EVA, 1 to 25 parts by weight of a modified olefin resin or copolymer resin, 50 to 300 parts by weight of an inorganic filler, and as required A small amount of additive is mixed and granulated with an extruder to form a granule.
[0030]
On the other hand, 25 to 70 parts by weight of polyolefin, 74 to 15 parts by weight of EVA, 1 to 15 parts by weight of a modified olefin resin or copolymer resin, 50 to 300 parts by weight of an inorganic filler, and as required 1 to 15 parts by weight of rosin and a small amount of additives are mixed and sheeted with an extruder to make a long sheet to be the base layer 2.
[0031]
And the said granular material is laminated | stacked on this elongate sheet | seat, it heats and it press-integrates with a pressure roll etc., and manufactures a elongate flooring. In addition, when providing a fiber layer, such as a cold chill, on the back surface, the cold chill or the like may be overlapped on the lower side of the long sheet and simultaneously pressed with a pressure roll or the like.
[0032]
FIG. 2 is a schematic cross-sectional view of a long floor material according to another embodiment of the present invention.
[0033]
In this long flooring, the upper layer 1 is laminated and integrated on the base layer 2, and the resin film 3 having better stain resistance and scratch resistance than the upper layer 1 is formed on the surface of the upper layer 1. It is. This resin film 3 is a coating film of any one of an ultraviolet curable resin paint, an emulsion resin paint, and an aqueous resin paint, and has a film thickness of about 0.01 to 0.1 mm.
[0034]
Preferred UV curable resin paints for forming the resin film 3 include urethane UV curable resin paints, ester UV curable resin paints, acrylic UV curable resin paints, epoxy UV curable resin paints, and diene UV rays. Examples of the emulsion resin paint include vinyl acetate emulsion resin paint, acrylic emulsion resin paint, epoxy emulsion resin paint, urethane emulsion resin paint, and ester. Emulsion resin paints, diene emulsion resin paints, and the like. Preferred aqueous resin paints include aqueous acrylic resin paints, aqueous epoxy resin paints, aqueous urethane resin paints, aqueous ester resin paints, and aqueous diene resin resins. Examples include paints.
[0035]
When the resin film 3 as described above is formed on the surface of the upper layer 1, the stain resistance and the scratch resistance are further improved as compared to the long floor material of the embodiment shown in FIG. 1 where the upper layer 1 is exposed. In particular, when the resin film 3 is formed by applying the ultraviolet curable resin paint, the stain resistance and the scratch resistance are remarkably improved, and the resin film 3 has the advantage of improving water resistance and solvent resistance. This is very preferable.
[0036]
In the long floor material of this embodiment, the surface 1a of the upper layer 1 is appropriately roughened by performing corona discharge treatment, plasma discharge treatment, or electron beam irradiation treatment. It is preferable to perform such a treatment because there is an advantage that the adhesiveness between the upper layer 1 and the resin film 3 is improved and peeling of the resin film 3 can be prevented. It should be noted that if the resin film 3 is formed after a long time after the treatment, the adhesiveness is not significantly improved. Therefore, it is important to form the resin film 3 immediately after the treatment.
[0037]
The corona discharge treatment is desirably performed under conditions of a temperature of 0 to 50 ° C. and a discharge density of 300 to 1600 w / m ² / min. The plasma discharge treatment is performed in the atmosphere with an electric field strength of 5 to 90 kV / cm and a treatment time of 1 to 1. It is desirable to carry out under the condition of 180 seconds, and the electron beam irradiation treatment is desirably carried out under conditions of an acceleration voltage of 300 to 1000 kV and an irradiation dose of 1 to 30 Mrad.
[0038]
The upper layer 1 and the lower layer 2 are the same as the upper layer 1 and the lower layer 2 of the long floor material shown in FIG. Also in the long flooring of this embodiment, rosin is blended in the underlayer 2 in order to make the upper layer 1 and the underlayer 2 contain a small amount of various additives and to improve the adhesion to the floor. Or a fiber layer can be pressure-bonded, or a primer layer with good adhesion can be formed.
[0039]
【Example】
Next, more specific examples and comparative examples of the long flooring of the present invention will be described.
[0040]
[Example 1]
60 parts by weight of low density polyethylene (342 manufactured by Tosoh Corporation), 20 parts by weight of EVA having 28% by weight of vinyl acetate (EV260 manufactured by Mitsui DuPont Chemical Co., Ltd.), ethylene-maleic anhydride- Acrylic ester terpolymer resin (bondin H × 8140 manufactured by Sumitomo Chemical Co., Ltd.) 20 parts by weight, calcium carbonate powder having an average particle size of 3 μm is uniformly kneaded at a ratio of 150 parts by weight, and an extruder. And then pulverized to obtain a granular material having a particle size of 3 mm or less.
[0041]
On the other hand, 55 parts by weight of the low-density polyethylene is 40 parts by weight of the EVA, 5 parts by weight of the terpolymer resin, 5 parts by weight of rosin, and 150 parts by weight of the calcium carbonate powder. Were kneaded uniformly and sheeted with an extruder to form a long sheet (thickness 1 mm) serving as an underlayer.
[0042]
And said granular material was laminated | stacked on this elongate sheet | seat, and it heated at 80 degreeC, this was pressed, and the elongate flooring material of thickness 2mm was produced.
[0043]
The long flooring was examined for (1) stain resistance, (2) scratch resistance, (3) residual dent, and (4) flexibility in the following manner.
[0044]
(1) Dirt resistance (color difference)
While removing the standard contaminants according to JIS L 1023 on the surface of the sample obtained by cutting the long flooring material, according to the method of JIS A 1453, the surface of the sample is polished 80 times with a rubber ring without wrapping abrasive paper, Further, the removal of contaminants was stopped and the rubber ring was polished 20 times. Then, the color difference (ΔE) between the above-mentioned soiled sample and the original sample without soil was determined by the color difference measuring method of JIS K 7105. As a result, the color difference was only 5.21% as shown in Table 1 below, and excellent stain resistance was obtained.
[0045]
(2) Scratch resistance The surface pencil hardness of the sample cut from the long floor material was measured by the handwriting method of JIS K 5400. As a result, as shown in Table 1 below, the surface had a pencil hardness of 3H and had good scratch resistance.
[0046]
{Circle around (3)} Residual dents A sample obtained by cutting a long floor material was examined for residual dents by the residual dent test method of JIS A 5705. As a result, as shown in Table 1 below, the residual dent was only 3.4% and had excellent dent resistance.
[0047]
(4) A process of cutting a flexible long floor material into a strip of 5 cm width and 25 cm length to produce a number of samples and winding the above sample around a plurality of pipes having different diameters at room temperature of 20 ° C. Repeated three times, the smallest diameter pipe that did not crack in the sample was investigated three times, and the quality of the flexibility was judged from the diameter of the pipe. As a result, the minimum pipe diameter at which no cracks occurred in the sample was 6 mm or less as shown in Table 1 below, and the sample had excellent flexibility.
[0048]
[Example 2]
50 parts by weight of low density polyethylene used in Example 1, 40 parts by weight of EVA used in Example 1, 10 parts by weight of terpolymer resin used in Example 1, and calcium carbonate used in Example 1 The powder was uniformly kneaded at a ratio of 150 parts by weight, extruded from an extruder, and pulverized to obtain a powder particle having a particle size of 3 mm or less.
[0049]
Then, the above granular material is laminated on a long sheet having a thickness of 1 mm formed in the same manner as in Example 1, and heated and pressed at the same temperature and pressure as in Example 1 to obtain a length of 2 mm. A scale floor material was produced.
[0050]
With respect to the sample obtained by cutting the long flooring material, (1) stain resistance (color difference), (2) scratch resistance, (3) residual dent, and (4) flexibility were examined in the same manner as in Example 1. The results are shown in Table 1 below.
[0051]
[Example 3]
40 parts by weight of the low density polyethylene used in Example 1, 55 parts by weight of EVA used in Example 1, 5 parts by weight of the terpolymer resin used in Example 1, and calcium carbonate used in Example 1 The powder was uniformly kneaded at a ratio of 150 parts by weight, extruded from an extruder, and pulverized to obtain a powder particle having a particle size of 3 mm or less.
[0052]
Then, the above granular material is laminated on a long sheet having a thickness of 1 mm formed in the same manner as in Example 1, heated and pressed at the same temperature and the same pressure as in Example 1, and a thickness of 2 mm. A long flooring was prepared.
[0053]
With respect to the sample obtained by cutting the long flooring material, (1) stain resistance (color difference), (2) scratch resistance, (3) residual dent, and (4) flexibility were examined in the same manner as in Example 1. The results are shown in Table 1 below.
[0054]
[Example 4]
After the corona discharge treatment was performed on the surface of the long flooring material obtained in Example 2, a urethane-based ultraviolet curable resin paint manufactured by Nippon Bee Chemical Co., Ltd. was applied, and the coating film was cured by ultraviolet irradiation to obtain a film thickness. Produced a long floor material in which a urethane-based resin film of approximately 0.03 mm was formed on the surface of the upper layer.
[0055]
With respect to the sample obtained by cutting the long flooring material, (1) stain resistance (color difference), (2) scratch resistance, (3) residual dent, and (4) flexibility were examined in the same manner as in Example 1. The results are shown in Table 1 below.
[0056]
[Example 5]
After the corona discharge treatment was performed on the surface of the long flooring material obtained in Example 2, an acrylic ultraviolet curable resin coating made by Dainichi Seikagaku Co., Ltd. was applied, and the coating film was cured by irradiation with ultraviolet rays. A long floor material in which an acrylic resin film having a thickness of approximately 0.03 mm was formed on the surface of the upper layer was produced.
[0057]
With respect to the sample obtained by cutting the long flooring material, (1) stain resistance (color difference), (2) scratch resistance, (3) residual dent, and (4) flexibility were examined in the same manner as in Example 1. The results are shown in Table 1 below.
[0058]
[Comparative Examples 1-3]
From 80 parts by weight of the low density polyethylene used in Example 1, 20 parts by weight of EVA used in Example 1 and 150 parts by weight of calcium carbonate powder used in Example 1 were uniformly kneaded from an extruder. This was extruded and pulverized to obtain a granular material having a particle size of 3 mm or less. Then, the above granular material is laminated on a long sheet having a thickness of 1 mm formed in the same manner as in Example 1, heated and pressed at the same temperature and the same pressure as in Example 1, and a thickness of 2 mm. The long flooring material of Comparative Example 1 was prepared.
[0059]
Further, 80 parts by weight of the low density polyethylene used in Example 1, 10 parts by weight of EVA used in Example 1, 10 parts by weight of the terpolymer resin used in Example 1, and Example 1 were used. Calcium carbonate powder was uniformly kneaded at a ratio of 150 parts by weight, extruded from an extruder, and pulverized to obtain a granular material having a particle size of 3 mm or less. Then, the above granular material is laminated on a long sheet having a thickness of 1 mm formed in the same manner as in Example 1, heated and pressed at the same temperature and the same pressure as in Example 1, and a thickness of 2 mm. The long flooring material of Comparative Example 2 was prepared.
[0060]
Further, 20 parts by weight of the low density polyethylene used in Example 1, 70 parts by weight of EVA used in Example 1, 10 parts by weight of the terpolymer resin used in Example 1, and Example 1 were used. Calcium carbonate powder was uniformly kneaded at a ratio of 150 parts by weight, extruded from an extruder, and pulverized to obtain a granular material having a particle size of 3 mm or less. Then, the above granular material is laminated on a long sheet having a thickness of 1 mm formed in the same manner as in Example 1, heated and pressed at the same temperature and the same pressure as in Example 1, and a thickness of 2 mm. The long flooring material of Comparative Example 3 was prepared.
[0061]
About each sample which cut | disconnected the long flooring material of the obtained comparative examples 1-3, it was the same as Example 1, (1) dirt resistance (color difference), (2) scratch resistance, (3) residual dent, (4) The flexibility was examined. The results are shown in Table 1 below.
[0062]
[Table 1]

[0063]
As can be seen from Table 1, the long flooring materials of Comparative Examples 1 and 2 in which the amount of the low-density polyethylene in the upper layer is as high as 80 parts by weight are small in residual dents of 3% or less and excellent in dent resistance. It can be seen that the minimum pipe diameter indicating the quality of the flexibility is as large as 35 to 40 mm, and the flexibility required for the long flooring is inferior. In addition, the long flooring material of Comparative Example 3 has a small pipe diameter of 6 mm or less and excellent flexibility with a low blending amount of low density polyethylene of 20 parts by weight and a large blending amount of EVA of 70 parts by weight. However, it can be seen that the stain resistance (color difference) is as bad as 24.61% and the residual dent is as large as 15.8%.
[0064]
On the other hand, the long flooring materials of Examples 1 to 3 have excellent flexibility with a minimum pipe diameter of 6 mm or less indicating the quality of flexibility. It can be seen that the stain resistance (color difference) is as good as 5.21 to 9.15%, the scratch resistance is as good as 2H to 3H, and the residual dent is as small as 3.4 to 7.1%. In particular, comparing Examples 1 to 3, the greater the amount of the ternary copolymer resin, the better the stain resistance (color difference) and scratch resistance, and the smaller the residual dent, the better the dent resistance. It turns out that it is improving. From this, it can be seen that the ternary copolymer resin is extremely effective in improving the stain resistance, scratch resistance and dent resistance.
[0065]
Furthermore, the long flooring materials of Examples 4 and 5 in which the urethane and acrylic UV curable resin films are formed on the surface of the long flooring material of Example 2 have both stain resistance (color difference) and scratch resistance. The dent resistance is also improved as compared with the flooring material of Example 2, and it can be seen that the ultraviolet curable resin film is extremely effective in improving the stain resistance, scratch resistance and dent resistance.
[0066]
【The invention's effect】
As is clear from the above description, the long flooring of the present invention has excellent flexibility required for the long flooring, and has comprehensive physical properties such as dirt resistance, scratch resistance, and dent resistance. In particular, long flooring materials that have a resin film on the surface of the upper layer that has better soil resistance and scratch resistance than the upper layer are effective in improving various physical properties. Becomes even more prominent.
[Brief description of the drawings]
FIG. 1 is a schematic cross-sectional view of a long floor material according to an embodiment of the present invention.
FIG. 2 is a schematic cross-sectional view of a long floor material according to another embodiment of the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Upper layer 1a Surface of upper layer 2 Underlayer 3 Resin film

Claims

An elongate flooring having an upper layer and an underlayer, the upper layer comprising 30 to 70 parts by weight of polyolefin, 69 to 5 parts by weight of ethylene-vinyl acetate copolymer, methacrylic acid, maleic anhydride, acrylic 1-25 parts by weight modified olefin resins with either an acid, is a layer formed by blending an inorganic filler in a proportion of 50 to 300 parts by weight, underlayer 25 to 70 parts by weight of the polyolefin to, ethylene - that 74-15 parts by weight of vinyl acetate copolymer, 1 to 15 parts by weight of the above modified olefin resins, a layer formed by blending an inorganic filler in a proportion of 50 to 300 parts by weight A long flooring characterized by

The long flooring according to claim 1, wherein the polyolefin is low-density polyethylene.

The long flooring according to claim 1 or 2, wherein a resin film having better stain resistance and scratch resistance than the upper layer is formed on the surface of the upper layer.

The long flooring material according to claim 3, wherein the resin film is a coating film of any one of an ultraviolet curable resin paint, an emulsion resin paint, and an aqueous resin paint.

The long flooring according to claim 3 or 4, wherein the surface of the upper layer is subjected to corona discharge treatment, plasma discharge treatment or electron beam irradiation treatment.