JP3888731B2 - Resin composition and use thereof - Google Patents

Resin composition and use thereof Download PDF

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Publication number
JP3888731B2
JP3888731B2 JP11021197A JP11021197A JP3888731B2 JP 3888731 B2 JP3888731 B2 JP 3888731B2 JP 11021197 A JP11021197 A JP 11021197A JP 11021197 A JP11021197 A JP 11021197A JP 3888731 B2 JP3888731 B2 JP 3888731B2
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resin composition
resin
mol
laminate
layer
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JPH10287785A (en
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英史 大西
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Nippon Synthetic Chemical Industry Co Ltd
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Nippon Synthetic Chemical Industry Co Ltd
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Description

【0001】
【発明の属する技術分野】
本発明は、エチレン−酢酸ビニル共重合体ケン化物(以下、EVOHと略記する)の樹脂組成物およびその用途に関し、更に詳しくは汚染除去性に優れ、壁紙等の内装材用途や農業用フィルムなどに有用な樹脂組成物およびその積層体に関する。
【0002】
【従来の技術】
従来より、塩化ビニル樹脂のシートやフィルムは、建築内装用の壁紙や家具等の仕上げ用の化粧シート、農業用資材、自動車の内装用資材、日用雑貨(ビニルマット、傘等)などに利用されており、更にはデスクマット、ファイル表紙、手帳表紙等の事務用品や文房具などにも多用されている。
しかしながら、かかる塩化ビニル樹脂中には多量の可塑剤が含有されており、塩化ビニル樹脂中の可塑剤の悪影響を防ぐために塩化ビニル樹脂層にEVOHを積層した壁紙(実公平2−47015号公報)や可塑剤を25〜55重量%含有するポリ塩化ビニル系フィルムに2〜50μm厚みのEVOHを積層した積層体(特開昭60−224542号公報)が提案されている。
【0003】
【発明が解決しようとする課題】
しかしながら、上記のいずれの積層体(壁紙)も短期間の可塑剤抑制効果は認められるものの、高湿度下で、かつ30〜40℃程度の温度で長期間放置された場合には、かかる抑制効果も低下することが推察され、新なる改善が望まれるところである。
【0004】
【課題を解決するための手段】
そこで、本発明者はかかる問題を解決するため鋭意研究を重ねた結果、エチレン含有量20〜60モル%,ケン化度90モル%以上のEVOH(A)、SP値(Smallの式より算出)が8.5〜11のポリスチレン系化合物(B)およびホウ素化合物(C)からなる樹脂組成物が上記の課題を解決することを見出し本発明を完成するに至った。
【0005】
【発明の実施の形態】
以下、本発明の製造法について具体的に説明する。
本発明のEVOH(A)は、エチレン含量20〜60モル%(更には25〜50モル%)で、酢酸ビニル成分のケン化度が90モル%以上(更には95モル%以上)のものが用いられ、エチレン含量が20モル%未満では、高湿度下における可塑剤抑制効果が不十分となり、逆に60モル%を越えると、EVOHのバリヤー性が低下して本発明の目的を達成することはできず、また、ケン化度が90モル%未満でも高湿度下における可塑剤抑制効果が不十分となって本発明の目的を達成することはできない。
【0006】
また、該EVOHは更に少量のプロピレン、イソブテン、α−オクテン、α−ドデセン、α−オクタデセン等のα−オレフィン、不飽和カルボン酸又はその塩・部分アルキルエステル・完全アルキルエステル・ニトリル・アミド・無水物、不飽和スルホン酸又はその塩等のコモノマーを含んでいても差支えない。
また、EVOH(A)のメルトインデックス(MI)は、0.5〜50g/10分(210℃、2160g荷重)が好ましく、更には1〜35g/10分(同上)が好ましい。かかるMIが0.5g/10分(同上)未満では溶液或いは押出コーティングする際の加工性が不良となり、逆に50g/10分(同上)を越えると汚染除去性が不十分となって好ましくない。
【0007】
本発明のポリスチレン系化合物(B)は、SP値(Smallの式より算出)が8.5〜11であることが必要で、かかるSP値が8.5未満では、成形物にしたときに外観不良を起こし、また可塑剤抑制効果が不十分となり、逆に11を越えると、高湿度下での可塑剤抑制効果が不十分となって本発明の目的を達成することはできない
【0009】
本発明のホウ素化合物(C)としては、ホウ酸またはその金属塩、例えばホウ酸カルシウム、ホウ酸コバルト、ホウ酸亜鉛(四ホウ酸亜鉛,メタホウ酸亜鉛等)、ホウ酸アルミニウム・カリウム、ホウ酸アンモニウム(メタホウ酸アンモニウム、四ホウ酸アンモニウム、五ホウ酸アンモニウム、八ホウ酸アンモニウム等)、ホウ酸カドミウム(オルトホウ酸カドミウム、四ホウ酸カドミウム等)、ホウ酸カリウム(メタホウ酸カリウム、四ホウ酸カリウム、五ホウ酸カリウム、六ホウ酸カリウム、八ホウ酸カリウム等)、ホウ酸銀(メタホウ酸銀、四ホウ酸銀等)、ホウ酸銅(ホウ酸第2銅、メタホウ酸銅、四ホウ酸銅等)、ホウ酸ナトリウム(メタホウ酸ナトリウム、二ホウ酸ナトリウム、四ホウ酸ナトリウム、五ホウ酸ナトリウム、六ホウ酸ナトリウム、八ホウ酸ナトリウム等)、ホウ酸鉛(メタホウ酸鉛、六ホウ酸鉛等)、ホウ酸ニッケル(オルトホウ酸ニッケル、二ホウ酸ニッケル、四ホウ酸ニッケル、八ホウ酸ニッケル等)、ホウ酸バリウム(オルトホウ酸バリウム、メタホウ酸バリウム、二ホウ酸バリウム、四ホウ酸バリウム等)、ホウ酸ビスマス、ホウ酸マグネシウム(オルトホウ酸マグネシウム、二ホウ酸マグネシウム、メタホウ酸マグネシウム、四ホウ酸三マグネシウム、四ホウ酸五マグネシウム等)、ホウ酸マンガン(ホウ酸第1マンガン、メタホウ酸マンガン、四ホウ酸マンガン等)、ホウ酸リチウム(メタホウ酸リチウム、四ホウ酸リチウム、五ホウ酸リチウム等)などの他、ホウ砂、カーナイト、インヨーアイト、コトウ石、スイアン石、ザイベリ石等のホウ酸塩鉱物などが挙げられる。
【0010】
上記の(A)〜(C)の配合重量比は特に限定されないが、(A)および(B)の配合重量比が(A)/(B)=95〜50/5〜50であることが好ましく、更には(A)/(B)=90〜70/10〜30であることが好ましい。かかる配合重量比よりも(A)が多くなり過ぎると高湿度下での可塑剤抑制効果が不十分となり、逆に(A)が少なくなり過ぎると汚染除去性が不十分となって好ましくない。
また、(C)の配合量は、(A)100重量部に対して0.001〜0.1重量部であることが好ましく、更には0.01〜0.08重量部が好ましく、かかる(C)が0.001重量部未満では高湿度下での可塑剤抑制効果が不十分となり、逆に0.1重量部を越えると成形物の外観が不良となって好ましくない。
【0011】
上記の(A)〜(C)の混合方法としては特に限定されることなく、一括混合する方法やいずれかの2種を混合後に残りに1種を混合する方法のいずれでもよいが、本発明では、予め混合された(A)と(C)からなる組成物に(C)を溶融混合或いは溶液分散後、精製することが好ましい。
かくして本発明の樹脂組成物(a)が得られるわけであるが、該樹脂組成物(a)は、積層体用途としても有用で、各種の基材と積層することができる。
かかる基材としては、熱可塑性樹脂(b)が重要で、具体的には、塩化ビニル樹脂、ポリオレフィン系樹脂、ポリエステル系樹脂、アクリル系樹脂、ポリスチレン系樹脂、ポリアミド系樹脂等が挙げられるが、中でも塩化ビニル樹脂、ポリオレフィン系樹脂、ポリエステル系樹脂、ポリアミド系樹脂が好適に使用される。
【0012】
また、かかるポリオレフィン系樹脂としては、高密度ポリエチレン、中密度ポリエチレン、(直鎖状)低密度ポリエチレン、超低密度ポリエチレン、酢酸ビニルやアクリル酸エステル或いはブテン,ヘキセン,4−メチル−1−ペンテンなどのα−オレフィン類を共重合したポリエチレン、ポリプロピレンホモポリマー、エチレンをグラフト共重合したポリプロピレン、4−メチル−1−ペンテンなどのα−オレフィン類を共重合したポリプロピレン、ポリ−1−ブテン、ポリ−4−メチル−1−ペンテン及び上記ポリオレフィンに不飽和カルボン酸やその酸無水物,ビニルシラン系化合物,エポキシ基含有化合物等を共重合或いはグラフト重合してなる変性ポリオレフィン系樹脂などが挙げられ、高密度ポリエチレン、中密度ポリエチレン、(直鎖状)低密度ポリエチレン、超低密度ポリエチレン等のポリエチレン、ポリプロピレンホモポリマー、エチレンをグラフト共重合体したポリプロピレン、α−オレフィン類を共重合したポリプロピレン等のポリプロピレンやエチレン−酢酸ビニル共重合体などが好適に使用される。
【0013】
上記の如き基材上に本発明の樹脂組成物(a)の層を形成(積層)するに当たっては、特に限定されず、▲1▼溶液コーティング、▲2▼溶融押出コーティング、▲3▼フィルムラミネート(ドライラミネート)等の積層方法が挙げられる。
▲1▼溶液コーティングにおいては、樹脂組成物(a)の溶液或いは分散液が用いられ、その際の溶媒としては水とアルコールの混合溶媒が使用され、水の量は30〜70重量%(アルコールの量は70〜30重量%)、好ましくは40〜60重量%(アルコールの量は60〜40重量%)であり、30重量%未満又は70重量%を越えると均一な溶液が得難く塗膜が不透明となるという問題点が生じる。またアルコールとしては メタノール、エタノール、n−プロピルアルコール、 iso−プロピルアルコール、 n−ブチルアルコール、iso−ブチルアルコール、sec−ブチルアルコール、tert−ブチルアルコール等が挙げられ、n−プロピルアルコール、iso −プロピルアルコールが好適に使用される。
【0014】
かかる樹脂組成物(a)溶液或いは分散液中の樹脂組成物(a)濃度は特に制限はなく任意の範囲で塗工可能で通常は0.5〜25重量%程度が好ましいが、本発明の効果を効率よく発揮するためには10〜20重量%が最も好ましい。
かかる樹脂組成物(a)溶液或いは分散液を基材の表面にコーティングするに当たっては公知の方法を採用することができ、例えばグラビアコーター、リバースロールコーター、エアナイフコーター、ロータースクリーンコーター、フラットスクリーンコーター、スプレー、ハケ塗り、バーコーター等が挙げられ、好適にはグラビアコーターやリバースロールコーターが使用される。その後加熱乾燥されて紙の表面にEVOHの塗膜層が形成される訳であるが、かかる樹脂組成物(a)溶液或いは分散液を紙に塗布・乾燥する際の理想的な、樹脂組成物(a)溶液或いは分散液塗布時の溶液粘度とその後の乾燥温度は、樹脂組成物(a)溶液塗布時の溶液粘度が50〜1000cps、その後の乾燥温度が80〜120℃程度の範囲よりそれぞれ任意に選択すればよい。また、乾燥時の時間は特に限定されないが、通常は10秒〜10分(更には30秒〜5分)の範囲より適宜選択される。
【0015】
また、樹脂組成物(a)塗膜層の(乾燥後の)厚みは特に限定されないが、1〜50μmが好ましく、特に2〜10μmとすることが好ましく、樹脂組成物(a)の着量(乾燥後の付着量)は、1〜50g/m2が好ましく、更には2〜10g/m2が好ましい。(樹脂組成物(a)の着量は、下記の▲2▼、▲3▼についても同様である。)かかる樹脂組成物(a)溶液或いは分散液の塗布に当たって、通常は基材の表面には接着剤(アンカーコート)層が設けられる。かかる接着剤としては、有機チタン系接着剤、2液反応型ポリウレタン系接着剤、ポリエステル/イソシアネート系接着剤等が挙げられ、好適には2液反応型ポリウレタン系接着剤が使用される。
【0016】
▲2▼溶融押出コーティングにおいては、基材の表面に必要に応じてプライマー処理を施しておくことが好ましく、該プライマー処理剤としては上記の▲1▼に記載の有機チタン系接着剤、2液反応型ポリウレタン系接着剤、ポリエステル/イソシアネート系接着剤等が挙げられ、好適には2液反応型ポリウレタン系接着剤が使用され、かかるプライマー処理剤の使用量は0.1〜10g/m2、好ましくは0.3〜5g/m2である。樹脂組成物(a)の溶融押出に際しては公知の溶融押出機を用いることができ、(必要によりプライマー処理された)基材の表面に溶融押出コーティングすることが好ましい。また、溶融押出コーティングの際には、樹脂組成物(a)の安定したコーティングを行うために必要に応じてポリオレフィン系樹脂等のサポート層を入れて、2種2層以上の溶融押出コーティングを行ってもよい。
【0017】
▲3▼フィルムラミネート(ドライラミネート)においては、基材の表面に必要に応じて上記の如きプライマー処理を行った後、有機チタン系接着剤、2液反応型ポリウレタン系接着剤、ポリエステル/イソシアネート系接着剤等の接着剤を介して行うのであるが、この場合の樹脂組成物(a)のフィルムは延伸、無延伸どちらでもよく、延伸の場合は短時間の熱処理と配向の効果で後述する融解熱を上げることができるが、後でエンボス処理等が施されるのであれば、収縮する可能性もあり、この場合には無延伸フィルムが好ましい。また、このときの樹脂組成物(a)フィルムの厚みは5〜50μmが好ましく、更には10〜20μmが好ましい。
【0018】
かくして本発明の樹脂組成物(a)(層)/熱可塑性樹脂(b)(層)の積層体が得られるわけであるが、本発明においてはこれ以外にも、本発明の樹脂組成物(a)層をa、熱可塑性樹脂(b)層をbとすると、b(ポリオレフィン系樹脂)/a/b(塩化ビニル樹脂)、 b(ポリオレフィン系樹脂)/a/(ポリオレフィン系樹脂)、a/b(ポリオレフィン系樹脂)/b(塩化ビニル樹脂)、a/b(ポリエステル系樹脂)/b(塩化ビニル樹脂)、b(アクリル系樹脂)/a/b(塩化ビニル樹脂)等の積層構造を挙げることができ、特に(表側)a/b(塩化ビニル樹脂)(裏側)、(表側)a/b(ポリオレフィン系樹脂)/b(塩化ビニル樹脂)(裏側)の積層構造を有するものは、壁紙や化粧用シート等の内装材用途に有用で、これらの積層体の熱可塑性樹脂(b)層の裏面には洋紙、和紙、不織布、アスベスト、紙、ガラス、繊維、布等の壁紙用の基材を粘(接)着剤を塗布し、カレンダー法、ラミネート法等の方法で張り合わせることも可能で、また紙にナイフコーターやロールコーター、フラットスクリーンコーターで塩化ビニル樹脂を塗布し、その後樹脂組成物(a)を積層させることもできる。
【0019】
かかる壁紙を壁に貼着する場合には、一般に用いられる水系澱粉糊等の公知の接着剤を基材に塗布し、壁面に圧着させればよく、また、意匠性等の付加価値を高めるために該積層体の少なくとも一方の表面にエンボス加工を施して凹凸模様を形成することも有用であり、凹凸模様としては木目導管模様、塗装板の表面を模したもの、抽象模様、石目模様、布目模様、万線模様、木肌模様及びそれらを組み合わせたもの等を用いることができ、かかるエンボス加工により形成される凹凸模様の深さは模様により異なるが、壁紙用途の場合、通常1〜200μm程度に形成するのが、良好な立体感を付与することとなり好ましい。
また、壁紙等の意匠性を付与するために塩化ビニル樹脂等の基材を発泡させることも有用で、この場合の樹脂組成物(a)の積層工程は発泡処理の前後どちらでもよいが、実質的には溶液コーティングの時は樹脂組成物(a)積層後に発泡処理を行うことが好ましく、溶融コーティング或いはフィルムラミネート法の時は発泡処理後に樹脂組成物(a)を積層することが好ましい。
【0020】
エンボス加工により凹凸模様を形成する方法としては、所望の凹凸模様を形成した通常の熱エンボス機を用いてエンボス加工を施す方法やエクストルージョンコート装置の冷却ロール等に所望の凹凸模様を付与したエンボスロールを用い、樹脂組成物層を形成するのと同時にエンボス加工を行う所謂ダブリングエンボス法等いわゆるメカニカルエンボス法あるいは発泡抑制剤や発泡促進剤を含むインクを印刷し、発泡工程で凹凸模様をつけるケミカルエンボス法等が用いられる。また、a/b(塩化ビニル樹脂)、a/b(ポリオレフィン系樹脂)、a/b(ポリオレフィン系樹脂)、a/b(ポリオレフィン系樹脂)/b(ポリオレフィン系樹脂)、a/b(ポリオレフィン系樹脂)/b(ポリオレフィン系樹脂)/b(ポリオレフィン系樹脂)・・・、a/b(塩化ビニル樹脂)/a、a/b(ポリオレフィン系樹脂)/a、a/b(ポリオレフィン系樹脂)/b(ポリオレフィン系樹脂)・・・/a等の積層構造を有するものは、農業用フィルム(シート)として有用である。
【0021】
本発明では積層体の各層に可塑剤(塩化ビニル樹脂層には当然のことながら含有されている)、安定剤、界面活性剤、架橋性物質(エポキシ化合物、多価金属、無機又は有機の多塩基酸又はその塩等)、充填剤、着色剤、補強材としての繊維(ガラス繊維、炭素繊維等)、艶消剤(タルク、シリカ系粉末、ポリエチレン、ポリウレタン等の樹脂微粒子粉末)等を本発明の効果を阻害しない範囲において配合することもできる。
【0022】
尚、上記の如きa/b、b/a/b、・・・・・等の積層体におけるaおよびbの厚みはその用途等により一概に規定できないが、通常はaが1〜50μm、bが50〜10000μm程度の範囲から任意に選択され、層間に接着剤を用いる場合の該接着剤層の厚みは0.1〜10μm程度である。
かくして得られた本発明の積層体は、建築内装用の壁紙や家具等の仕上げ用の化粧シートなどをはじめデスクマット等の事務用品、塩ビレザーの表紙を用いた手帳やファイル等の文房具、自動車用の内装用資材、農業用フィルム等の農業用資材、日用雑貨(ビニルマット、傘等)などに利用することができ、中でも上記で詳述したように壁紙や化粧シート等の内装材や農業用フィルム(シート)に大変有用であり、殊に耐汚染性(汚染除去性)に優れた壁紙に有用である。
【0023】
【実施例】
以下に、実施例を挙げて本発明の方法を具体的に説明する。
なお、「%」、「部」とあるのは特にことわりのない限り、いずれも重量基準を意味する。
実施例1
エチレン含有量44モル%,ケン化度99.7モル%,MI12g/10分(210℃、2160g荷重)のEVOH(A)80部及びSP値9.1,MI1g/10分(200℃、5kg荷重)のポリスチレン(B)20部を溶融混合した後、かかる混合物にホウ酸(C)0.044部配合して本発明の樹脂組成物(a)を得た。
次いでかかる樹脂組成物(a)を二軸押出機にてリペット後、単軸押出機にて厚さ20μmのフィルムに成形した。
更に、片面にイソシアネート反応型ポリウレタン系接着剤(東洋モートン社製、AD−335A/cat−10)が1.5g/m2塗工された厚み400μmの軟質ポリ塩化ビニル(b)のシート(可塑剤含有量約50重量%)の接着剤面に上記のフィルムをドライラミネートして積層体を作製した。
得られた積層体を用いて以下の評価を行った。
【0024】
(汚染除去性)
積層体の樹脂組成物層表面に約70℃のホットコーヒーを直径2cm程度の大きさに塗布あるいは滴下し、20℃で24時間放置後に水を含ませたさらし木綿で拭き取った後の積層体の表面状態を目視により以下の通り評価した。なお、軟質ポリ塩化ビニル樹脂シート単独層についても同様に行った。
また、別途、得られた積層体を40℃で1日間放置処理して同様の評価を行った。
尚、靴墨(中性洗剤で拭き取った)、和がらし、水性マジック(市販の洗剤(マジックリン)で拭き取った)についても同様に評価した。
○ −−− 完全に拭き取れて汚染の痕跡が認められない。
△ −−− 汚染の痕跡は認められるものの、軟質ポリ塩化ビニル樹脂シート単独層の場合よりも痕跡は少ない。
× −−− 軟質ポリ塩化ビニル樹脂シート単独層の場合と同等の痕跡が認められる。
【0025】
(可塑剤移行性)
積層体(10cm×10cm)を樹脂組成物(a)層が上になるように平坦な場所に置き、樹脂組成物(a)層表面と接するように厚さ3mm,直径5cmの可塑剤無添加の塩化ビニル樹脂板を置いた後、均一に50g/cm2の荷重をかけて、70℃、90%RHで10日放置後の該塩化ビニル樹脂板の重量変化(可塑剤移行量)(g/m2)を測定して、以下の通り評価した。
○ −−− 重量変化が2g/m2未満
× −−− 重量変化が2g/m2以上
(耐薬品性)
エタノールを約1ccを積層体の樹脂組成物層表面に滴下し、常態で1時間放置後の表面状態を目視観察して、以下の通り評価した。
○ −−− 異状無し
× −−− 膨潤が認められる
【0028】
実施例
実施例1において、ホウ酸(C)の配合量を0.055部とした以外は同様に行って積層体を得て、同様に評価を行った。
【0029】
実施例
実施例において、EVOH(A)及びポリスチレン(B)の配合重量比を(A)/(B)=70部/30部とした以外は同様に行って積層体を得て、同様に評価を行った。
【0033】
比較例1
実施例1において、ポリスチレン(B)に代えて、ポリイソプレン(SP値=8.0)を用いた以外は同様に行って積層体を得て、同様に評価を行った。
【0034】
比較例2
実施例1において、ポリスチレン(B)に代えて、ポリアクリロニトリル(SP値=12)を用いた以外は同様に行って積層体を得て、同様に評価を行った。
【0035】
比較例3
実施例1において、ホウ酸(C)を無添加とした以外は同様に行って積層体を得て、同様に評価を行った。
実施例及び比較例の評価結果を表1に示す。
【0036】
【表1】

Figure 0003888731
【0037】
【発明の効果】
本発明の樹脂組成物は、EVOHに特定のポリスチレン系化合物及びホウ素化合物を配合しているため、耐防汚性(汚染除去性)に優れ、建築内装用の壁紙や家具等の仕上げ用の化粧シートなどをはじめデスクマット等の事務用品、塩ビレザーの表紙を用いた手帳やファイル等の文房具、自動車用の内装用資材、農業用フィルム等の農業用資材、日用雑貨(ビニルマット、傘等)などの積層体にも大変有用である。[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a resin composition of an ethylene-vinyl acetate copolymer saponified product (hereinafter abbreviated as EVOH) and its use. More specifically, the resin composition is excellent in decontamination, used for interior materials such as wallpaper, agricultural films, etc. The present invention relates to a resin composition useful for and a laminate thereof.
[0002]
[Prior art]
Conventionally, vinyl chloride resin sheets and films have been used for decorative interior sheets for furniture and furniture for architectural interiors, agricultural materials, automotive interior materials, daily goods (vinyl mats, umbrellas, etc.) It is also widely used for office supplies such as desk mats, file covers, notebook covers, and stationery.
However, such a vinyl chloride resin contains a large amount of plasticizer, and a wallpaper in which EVOH is laminated on the vinyl chloride resin layer in order to prevent the adverse effect of the plasticizer in the vinyl chloride resin (Japanese Utility Model Publication No. 2-47015). In addition, a laminate (JP-A-60-224542) in which EVOH having a thickness of 2 to 50 μm is laminated on a polyvinyl chloride film containing 25 to 55% by weight of a plasticizer has been proposed.
[0003]
[Problems to be solved by the invention]
However, although any of the above laminates (wallpaper) has a short-term plasticizer-inhibiting effect, it is effective when left at high temperatures and at temperatures of about 30 to 40 ° C. for a long time. Therefore, a new improvement is desired.
[0004]
[Means for Solving the Problems]
Therefore, the present inventor conducted extensive research to solve such problems, and as a result, EVOH (A) having an ethylene content of 20 to 60 mol% and a saponification degree of 90 mol% or more, an SP value (calculated from the Small formula). Has been found that a resin composition comprising a polystyrene-based compound (B) and a boron compound (C) having a molecular weight of 8.5 to 11 solves the above-mentioned problems, thereby completing the present invention.
[0005]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, the production method of the present invention will be specifically described.
The EVOH (A) of the present invention has an ethylene content of 20 to 60 mol% (more preferably 25 to 50 mol%) and a vinyl acetate component having a saponification degree of 90 mol% or more (further 95 mol% or more). When the ethylene content is less than 20 mol%, the plasticizer suppressing effect under high humidity becomes insufficient. Conversely, when the ethylene content exceeds 60 mol%, the barrier property of EVOH is lowered and the object of the present invention is achieved. Moreover, even if the degree of saponification is less than 90 mol%, the effect of suppressing the plasticizer under high humidity is insufficient and the object of the present invention cannot be achieved.
[0006]
In addition, the EVOH is further composed of a small amount of an α-olefin such as propylene, isobutene, α-octene, α-dodecene, α-octadecene, unsaturated carboxylic acid or salt thereof, partial alkyl ester, complete alkyl ester, nitrile, amide, anhydrous Or a comonomer such as unsaturated sulfonic acid or a salt thereof.
The melt index (MI) of EVOH (A) is preferably 0.5 to 50 g / 10 min (210 ° C., 2160 g load), and more preferably 1 to 35 g / 10 min (same as above). If the MI is less than 0.5 g / 10 min (same as above), the processability during solution or extrusion coating is poor, and conversely if it exceeds 50 g / 10 min (same as above), the decontamination property is insufficient, which is not preferable. .
[0007]
Polystyrene compounds (B) of the present invention, the SP value (calculated from the formula Small) is required to be 8.5 to 11, or in the hunt SP value is less than 8.5, when the molded product If the appearance is poor and the plasticizer suppressing effect is insufficient, and if it exceeds 11, the plasticizer suppressing effect under high humidity is insufficient and the object of the present invention cannot be achieved .
[0009]
As the boron compound (C) of the present invention, boric acid or a metal salt thereof such as calcium borate, cobalt borate, zinc borate (zinc tetraborate, zinc metaborate, etc.), aluminum borate / potassium borate, boric acid Ammonium (ammonium metaborate, ammonium tetraborate, ammonium pentaborate, ammonium octaborate, etc.), cadmium borate (cadmium orthoborate, cadmium tetraborate, etc.), potassium borate (potassium metaborate, potassium tetraborate) , Potassium pentaborate, potassium hexaborate, potassium octaborate, etc.), silver borate (silver metaborate, silver tetraborate, etc.), copper borate (cupric borate, copper metaborate, tetraborate) Copper), sodium borate (sodium metaborate, sodium diborate, sodium tetraborate, sodium pentaborate, Sodium phosphate, sodium octaborate, etc.), lead borate (lead metaborate, lead hexaborate, etc.), nickel borate (nickel orthoborate, nickel diborate, nickel tetraborate, nickel octaborate, etc.), Barium borate (barium orthoborate, barium metaborate, barium diborate, barium tetraborate, etc.), bismuth borate, magnesium borate (magnesium orthoborate, magnesium diborate, magnesium metaborate, trimagnesium tetraborate) , Pentamagnesium tetraborate, etc.), manganese borate (manganese borate, manganese metaborate, manganese tetraborate, etc.), lithium borate (lithium metaborate, lithium tetraborate, lithium pentaborate, etc.), etc. Besides, borax, carnite, inyoite, agate stone, suian stone, zyberite stone, etc. Such as borate minerals like.
[0010]
The blending weight ratio of (A) to (C) is not particularly limited, but the blending weight ratio of (A) and (B) is (A) / (B) = 95 to 50/5 to 50. More preferably, (A) / (B) = 90 to 70/10 to 30 is preferable. If the amount of (A) is more than the blended weight ratio, the effect of suppressing the plasticizer under high humidity becomes insufficient. On the other hand, if the amount of (A) is too small, the decontamination property becomes insufficient, which is not preferable.
The amount of (C) is preferably 0.001 to 0.1 parts by weight, more preferably 0.01 to 0.08 parts by weight, based on 100 parts by weight of (A). If C) is less than 0.001 part by weight, the effect of suppressing the plasticizer under high humidity becomes insufficient. Conversely, if it exceeds 0.1 part by weight, the appearance of the molded product becomes unfavorable.
[0011]
The mixing method of the above (A) to (C) is not particularly limited, and any of a method of batch mixing and a method of mixing one of the two after mixing two types may be used. Then, it is preferable to refine | purify after melt-mixing or solution-dispersing (C) to the composition which consists of (A) and (C) mixed beforehand.
Thus, although the resin composition (a) of the present invention is obtained, the resin composition (a) is also useful as a laminate and can be laminated with various substrates.
As such a base material, the thermoplastic resin (b) is important, and specific examples include vinyl chloride resin, polyolefin resin, polyester resin, acrylic resin, polystyrene resin, polyamide resin, and the like. Of these, vinyl chloride resin, polyolefin resin, polyester resin, and polyamide resin are preferably used.
[0012]
Such polyolefin resins include high density polyethylene, medium density polyethylene, (linear) low density polyethylene, very low density polyethylene, vinyl acetate, acrylate ester, butene, hexene, 4-methyl-1-pentene, etc. Polyethylene copolymerized with α-olefins, polypropylene homopolymer, polypropylene grafted with ethylene, polypropylene copolymerized with α-olefins such as 4-methyl-1-pentene, poly-1-butene, poly- Examples include 4-methyl-1-pentene and modified polyolefin resins obtained by copolymerizing or graft-polymerizing unsaturated carboxylic acids and acid anhydrides thereof, vinylsilane compounds, epoxy group-containing compounds, etc. with the above polyolefins. Polyethylene, medium density polyethylene, (Linear) Polyethylene such as low-density polyethylene and ultra-low-density polyethylene, polypropylene homopolymer, polypropylene grafted with ethylene, polypropylene such as polypropylene copolymerized with α-olefins, and ethylene-vinyl acetate copolymer Etc. are preferably used.
[0013]
In forming (laminating) the layer of the resin composition (a) of the present invention on the substrate as described above, it is not particularly limited. (1) Solution coating, (2) Melt extrusion coating, (3) Film lamination A laminating method such as (dry lamination) may be mentioned.
(1) In solution coating, a solution or dispersion of the resin composition (a) is used, and as the solvent, a mixed solvent of water and alcohol is used, and the amount of water is 30 to 70% by weight (alcohol). The coating amount is 70 to 30% by weight), preferably 40 to 60% by weight (the amount of alcohol is 60 to 40% by weight). When the amount is less than 30% or exceeds 70% by weight, it is difficult to obtain a uniform solution. The problem arises that becomes opaque. Examples of alcohol include methanol, ethanol, n-propyl alcohol, iso-propyl alcohol, n-butyl alcohol, iso-butyl alcohol, sec-butyl alcohol, tert-butyl alcohol, and the like. N-propyl alcohol, iso-propyl Alcohol is preferably used.
[0014]
The concentration of the resin composition (a) in the resin composition (a) solution or dispersion is not particularly limited and can be applied in an arbitrary range, and is usually preferably about 0.5 to 25% by weight. In order to exhibit an effect efficiently, 10 to 20 weight% is the most preferable.
For coating the resin composition (a) solution or dispersion on the surface of the substrate, a known method can be employed, such as a gravure coater, reverse roll coater, air knife coater, rotor screen coater, flat screen coater, Examples thereof include spraying, brushing, and bar coater. A gravure coater and a reverse roll coater are preferably used. Then, it is heated and dried to form an EVOH coating layer on the surface of the paper. This resin composition (a) is an ideal resin composition for applying and drying a solution or dispersion on paper. (A) The solution viscosity at the time of coating the solution or dispersion and the subsequent drying temperature are from the range where the resin composition (a) the solution viscosity at the time of coating the solution is 50 to 1000 cps and the subsequent drying temperature is about 80 to 120 ° C. Any selection may be made. Moreover, the time at the time of drying is not particularly limited, but it is usually appropriately selected from the range of 10 seconds to 10 minutes (more preferably 30 seconds to 5 minutes).
[0015]
The thickness of the resin composition (a) coating layer (after drying) is not particularly limited, but is preferably 1 to 50 μm, particularly preferably 2 to 10 μm, and the amount of resin composition (a) applied ( deposition amount after drying) is preferably from 1 to 50 g / m 2, more preferably from 2 to 10 g / m 2. (The amount of the resin composition (a) is the same for the following (2) and (3).) In applying the resin composition (a) solution or dispersion, it is usually applied to the surface of the substrate. Is provided with an adhesive (anchor coat) layer. Examples of such an adhesive include an organic titanium adhesive, a two-component reactive polyurethane adhesive, a polyester / isocyanate-based adhesive, and the like, and preferably a two-component reactive polyurethane adhesive is used.
[0016]
(2) In the melt extrusion coating, it is preferable to apply a primer treatment to the surface of the base material as necessary. As the primer treatment agent, the organotitanium adhesive as described in (1) above, two liquids Reactive polyurethane adhesives, polyester / isocyanate adhesives, and the like, preferably a two-component reactive polyurethane adhesive is used, and the amount of such primer treatment agent used is 0.1 to 10 g / m 2 , preferably from 0.3 to 5 g / m 2. In the melt extrusion of the resin composition (a), a known melt extruder can be used, and it is preferable to perform melt extrusion coating on the surface of the substrate (primed if necessary). In addition, in the case of melt-extrusion coating, a support layer such as a polyolefin-based resin is inserted as necessary in order to perform stable coating of the resin composition (a), and two or more types of melt-extrusion coating are performed. May be.
[0017]
(3) In film laminating (dry laminating), the surface of the substrate is subjected to the primer treatment as described above, and then an organic titanium adhesive, a two-component reactive polyurethane adhesive, or a polyester / isocyanate system. The film of the resin composition (a) in this case may be either stretched or non-stretched, and in the case of stretching, the melting described later by the effect of short-time heat treatment and orientation. Although heat can be raised, if an embossing treatment or the like is performed later, there is a possibility of shrinkage. In this case, an unstretched film is preferred. In addition, the thickness of the resin composition (a) film at this time is preferably 5 to 50 μm, and more preferably 10 to 20 μm.
[0018]
Thus, a laminate of the resin composition (a) (layer) / thermoplastic resin (b) (layer) of the present invention is obtained, but in the present invention, in addition to this, the resin composition ( a) The layer is a, and the thermoplastic resin (b) layer is b. b (polyolefin resin) / a / b (vinyl chloride resin), b (polyolefin resin) / a / (polyolefin resin), a Laminated structures such as / b (polyolefin resin) / b (vinyl chloride resin), a / b (polyester resin) / b (vinyl chloride resin), b (acrylic resin) / a / b (vinyl chloride resin) Particularly, those having a laminate structure of (front side) a / b (vinyl chloride resin) (back side), (front side) a / b (polyolefin resin) / b (vinyl chloride resin) (back side) Useful for interior materials such as wallpaper and decorative sheets Then, on the back side of the thermoplastic resin (b) layer of these laminates, a base material for wallpaper such as paper, Japanese paper, non-woven fabric, asbestos, paper, glass, fiber, cloth, etc. is applied with a sticky (contact) adhesive. It is also possible to laminate by a method such as a calender method or a laminate method, or a vinyl chloride resin can be applied to paper with a knife coater, roll coater or flat screen coater, and then the resin composition (a) can be laminated. .
[0019]
When pasting such a wallpaper on a wall, a known adhesive such as a water-based starch paste generally used may be applied to a base material and bonded to a wall surface, and in order to increase added value such as design properties. It is also useful to form an uneven pattern by embossing at least one surface of the laminate, and as the uneven pattern, a grain conduit pattern, a pattern imitating the surface of a painted plate, an abstract pattern, a stone pattern, A texture pattern, a line pattern, a bark pattern, or a combination thereof can be used, and the depth of the concavo-convex pattern formed by such embossing varies depending on the pattern, but in the case of wallpaper use, usually about 1 to 200 μm It is preferable to form it in order to give a good stereoscopic effect.
In addition, it is also useful to foam a base material such as a vinyl chloride resin in order to impart design properties such as wallpaper. In this case, the resin composition (a) may be laminated either before or after the foaming treatment, Specifically, the foaming treatment is preferably performed after the resin composition (a) is laminated during solution coating, and the resin composition (a) is preferably laminated after the foaming treatment during melt coating or film lamination.
[0020]
As a method for forming a concavo-convex pattern by embossing, a method for embossing using a normal hot embossing machine on which a desired concavo-convex pattern is formed, or an embossing having a desired concavo-convex pattern provided on a cooling roll of an extrusion coating apparatus, etc. A chemical that prints an ink containing a so-called mechanical embossing method, such as a so-called doubling embossing method, which performs embossing at the same time as forming a resin composition layer using a roll, or an uneven pattern in the foaming process. An embossing method or the like is used. Also, a / b (vinyl chloride resin), a / b (polyolefin resin), a / b (polyolefin resin), a / b (polyolefin resin) / b (polyolefin resin), a / b (polyolefin) Resin) / b (polyolefin resin) / b (polyolefin resin) ..., a / b (vinyl chloride resin) / a, a / b (polyolefin resin) / a, a / b (polyolefin resin) ) / B (polyolefin resin)... / A and the like are useful as agricultural films (sheets).
[0021]
In the present invention, a plasticizer (contained naturally in the vinyl chloride resin layer), a stabilizer, a surfactant, and a crosslinkable substance (epoxy compound, polyvalent metal, inorganic or organic) are contained in each layer of the laminate. Basic acids or salts thereof), fillers, colorants, fibers as reinforcing materials (glass fibers, carbon fibers, etc.), matting agents (talc, silica-based powders, resin fine particle powders such as polyethylene and polyurethane), etc. It can also mix | blend in the range which does not inhibit the effect of invention.
[0022]
In addition, the thickness of a and b in the laminates such as a / b, b / a / b,... As described above cannot be defined unconditionally depending on the use, but usually, a is 1 to 50 μm, b Is arbitrarily selected from the range of about 50 to 10,000 μm, and the thickness of the adhesive layer when an adhesive is used between the layers is about 0.1 to 10 μm.
The laminate of the present invention thus obtained is made up of wallpaper for architectural interiors, decorative sheets for finishing furniture etc., office supplies such as desk mats, stationery such as notebooks and files using the cover of PVC leather, automobiles Can be used for interior materials, agricultural materials such as agricultural films, and daily goods (vinyl mats, umbrellas, etc.). Among them, as detailed above, interior materials such as wallpaper and decorative sheets It is very useful for agricultural films (sheets), and particularly useful for wallpaper having excellent stain resistance (decontamination).
[0023]
【Example】
Hereinafter, the method of the present invention will be specifically described with reference to examples.
Note that “%” and “parts” are based on weight unless otherwise specified.
Example 1
EVOH (A) with an ethylene content of 44 mol%, a saponification degree of 99.7 mol%, MI of 12 g / 10 min (210 ° C., 2160 g load) and an SP value of 9.1, MI of 1 g / 10 min (200 ° C., 5 kg) (Load) 20 parts of polystyrene (B) was melt-mixed, and 0.044 part of boric acid (C) was blended with the mixture to obtain a resin composition (a) of the present invention.
Subsequently, the resin composition (a) was reppetted with a twin screw extruder, and then formed into a film having a thickness of 20 μm with a single screw extruder.
Furthermore, a sheet of flexible polyvinyl chloride (b) having a thickness of 400 μm coated with 1.5 g / m 2 of an isocyanate-reactive polyurethane adhesive (AD-335A / cat-10, manufactured by Toyo Morton Co., Ltd.) on one side (plastic) The above film was dry laminated on the adhesive surface having an agent content of about 50% by weight to prepare a laminate.
The following evaluation was performed using the obtained laminated body.
[0024]
(Decontamination)
About 70 cm of hot coffee having a diameter of about 2 cm is applied or dripped onto the surface of the resin composition layer of the laminate, and the laminate is left to dry at 20 ° C. for 24 hours and then wiped off with exposed cotton soaked in water. The surface state was visually evaluated as follows. In addition, it carried out similarly about the soft polyvinyl chloride resin sheet single layer.
Separately, the obtained laminate was allowed to stand at 40 ° C. for 1 day for the same evaluation.
Shoe ink (wiped with a neutral detergent), softening, and aqueous magic (wiped with a commercially available detergent (Magicrin)) were also evaluated in the same manner.
○ −−− Wipe off completely and no trace of contamination is observed.
Δ −−− Although traces of contamination are observed, there are fewer traces than in the case of the single layer of the soft polyvinyl chloride resin sheet.
X ---- The trace equivalent to the case of a soft polyvinyl chloride resin sheet single layer is recognized.
[0025]
(Plasticizer migration)
Laminate (10 cm x 10 cm) is placed on a flat surface with the resin composition (a) layer on top, and no plasticizer is added with a thickness of 3 mm and a diameter of 5 cm so as to contact the surface of the resin composition (a) layer The weight change (plasticizer transfer amount) of the vinyl chloride resin plate after being left to stand at 70 ° C. and 90% RH for 10 days under a uniform load of 50 g / cm 2 / M 2 ) was measured and evaluated as follows.
○ --- Weight change is less than 2 g / m 2 × --- Weight change is 2 g / m 2 or more (chemical resistance)
About 1 cc of ethanol was dropped on the surface of the resin composition layer of the laminate, and the surface state after standing for 1 hour in a normal state was visually observed and evaluated as follows.
○ −−− No abnormality × −−− Swelling is observed [0028]
Example 2
In Example 1, it carried out similarly except having made the compounding quantity of boric acid (C) into 0.055 part, obtained the laminated body, and evaluated similarly.
[0029]
Example 3
In Example 1 , a laminate was obtained in the same manner except that the blending weight ratio of EVOH (A) and polystyrene (B) was (A) / (B) = 70 parts / 30 parts. went.
[0033]
Comparative Example 1
In Example 1, a laminate was obtained in the same manner except that polyisoprene (SP value = 8.0) was used instead of polystyrene (B), and evaluation was performed in the same manner.
[0034]
Comparative Example 2
In Example 1, a laminate was obtained in the same manner except that polyacrylonitrile (SP value = 12) was used instead of polystyrene (B), and evaluation was performed in the same manner.
[0035]
Comparative Example 3
In Example 1, a laminate was obtained in the same manner except that boric acid (C) was not added, and evaluation was performed in the same manner.
The evaluation results of Examples and Comparative Examples are shown in Table 1.
[0036]
[Table 1]
Figure 0003888731
[0037]
【The invention's effect】
Since the resin composition of the present invention is blended with EVOH with a specific polystyrene compound and a boron compound, it is excellent in antifouling resistance (contamination removal) and is used for finishing interiors such as wallpaper and furniture for architectural interiors. Office supplies such as sheets and desk mats, stationery such as notebooks and files using the cover of PVC leather, interior materials for automobiles, agricultural materials such as agricultural films, daily miscellaneous goods (vinyl mats, umbrellas, etc.) It is also very useful for laminates such as

Claims (8)

エチレン含有量20〜60モル%,ケン化度90モル%以上のエチレン−酢酸ビニル共重合体ケン化物(A)、SP値(Smallの式より算出)が8.5〜11のポリスチレン系化合物(B)およびホウ素化合物(C)からなることを特徴とする樹脂組成物。Saponified ethylene-vinyl acetate copolymer (A) having an ethylene content of 20 to 60 mol% and a saponification degree of 90 mol% or more, and a polystyrene compound having an SP value (calculated from the formula of Small) of 8.5 to 11 ( A resin composition comprising B) and a boron compound (C). ホウ素化合物(C)がホウ酸またはその金属塩であることを特徴とする請求項1記載の樹脂組成物。Boron compound (C) is according to claim 1 Symbol placement of the resin composition characterized in that it is a boric acid or a metal salt thereof. エチレン含有量20〜60モル%,ケン化度90モル%以上のエチレン−酢酸ビニル共重合体ケン化物(A)およびSP値(Smallの式より算出)が8.5〜11のポリスチレン系化合物(B)の配合重量比が(A)/(B)=95〜50/5〜50であることを特徴とする請求項1〜いずれか記載の樹脂組成物。Saponified ethylene-vinyl acetate copolymer (A) having an ethylene content of 20 to 60 mol% and a saponification degree of 90 mol% or more and a polystyrene compound having an SP value (calculated from the Small formula) of 8.5 to 11 ( mixing weight ratio (a) / (B) = 95~50 / 5~50 claim 1-2 resin composition according to any one of which is a of B). ホウ素化合物(C)の配合量がエチレン含有量20〜60モル%,ケン化度90モル%以上のエチレン−酢酸ビニル共重合体ケン化物(A)100重量部に対して0.001〜0.1重量部であることを特徴とする請求項1〜いずれか記載の樹脂組成物。The blending amount of the boron compound (C) is 0.001 to 0.000 with respect to 100 parts by weight of the saponified ethylene-vinyl acetate copolymer (A) having an ethylene content of 20 to 60 mol% and a saponification degree of 90 mol% or more. It is 1 weight part, The resin composition in any one of Claims 1-3 characterized by the above-mentioned. 請求項1〜いずれか記載の樹脂組成物(a)を少なくとも1層積層したことを特徴とする積層体。A laminate comprising at least one layer of the resin composition (a) according to any one of claims 1 to 4 . 樹脂組成物(a)と積層される他の層が熱可塑性樹脂(b)からなる層であることを特徴とする請求項記載の積層体。6. The laminate according to claim 5, wherein the other layer laminated with the resin composition (a) is a layer comprising a thermoplastic resin (b). 熱可塑性樹脂(b)が塩化ビニル樹脂、ポリオレフィン系樹脂、ポリエステル系樹脂、ポリアミド系樹脂のいずれかであることを特徴とする請求項記載の積層体。The laminate according to claim 6, wherein the thermoplastic resin (b) is any one of a vinyl chloride resin, a polyolefin resin, a polyester resin, and a polyamide resin. 溶液コーティング法、共押出法、ドライラミネート法のいずれかの方法で積層されたことを特徴とする請求項5〜7いずれか記載の積層体。The laminate according to any one of claims 5 to 7 , wherein the laminate is laminated by any one of a solution coating method, a coextrusion method, and a dry lamination method.
JP11021197A 1997-04-10 1997-04-10 Resin composition and use thereof Expired - Lifetime JP3888731B2 (en)

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