JP4093880B2 - Shape-retaining composite fiber - Google Patents
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- JP4093880B2 JP4093880B2 JP2003054788A JP2003054788A JP4093880B2 JP 4093880 B2 JP4093880 B2 JP 4093880B2 JP 2003054788 A JP2003054788 A JP 2003054788A JP 2003054788 A JP2003054788 A JP 2003054788A JP 4093880 B2 JP4093880 B2 JP 4093880B2
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【０００１】
【発明が属する技術分野】
本発明は、熱融着しても形状保持性が損なわれない形状保持性複合繊維に関する。
【０００２】
【従来の技術】
従来、折り曲げたり、捻じったりしても元に戻らない形状保持性を要求される成形物には、針金や金網などの金属が使用されているが、金属は錆びやすく硬いために、屋外での使用や食品包装の用途には適したものとは言えない。また、これを避けるため、金属を樹脂材や紙で覆ったものがあるが、食品関連に使用した場合、食品関連包装の検査段階で行われる金属探知機による異物混入検査に反応するから、出荷前の最終段階での安全確認が出来なくなるという検査段階での問題がある。
【０００３】
かかる問題を解決する方法として、ポリエチレンを芯材とし、他の熱可塑性樹脂を鞘材とする芯鞘構造を有する複合延伸物からなる形状保持性を有する複合系塑性変形物が提案されている（例えば、特許文献１参照）。しかしながら、かかる複合系塑性変形物は芯部だけではなく、鞘部も延伸されており、その結果、鞘部も結晶化するので、熱融着性が劣る虞がある。
【特許文献１】
特開平１０−２６６０３５号公報（請求項１）
【０００４】
【発明が解決しようとする課題】
本発明の目的は、繊維表面を加熱してネット状に加工したりフィルム等と熱融着しても形状保持性を有する形状保持性複合繊維を得ることにある。
【０００５】
【課題を解決するための手段】
すなわち本発明は、９０度折り曲げ時の戻り角が１０度以下である形状保持性糸状延伸物（Ａ）の表面に、該形状保持性糸状延伸物（Ａ）より融点が低い熱可塑性樹脂（Ｃ）からなる分散体又は溶液を、塗布又は含浸した被覆層（Ｂ）を有してなり、当該熱可塑性樹脂（Ｃ）がエチレン・酢酸ビニル共重合体、エチレン・（メタ）アクリル酸エステル重合体、エチレン・（メタ）アクリル酸共重合体から選ばれた少なくとも１種である形状保持性複合繊維に関する。
【０００６】
【発明の実施の形態】
形状保持性糸状延伸物（Ａ）
本発明に係わる形状保持性糸状延伸物（Ａ）の原料は、後述の被覆層（Ｂ）の原料である熱可塑性樹脂より高い融点を有する熱可塑性樹脂であれば特に限定されるものではなく、例えば、ポリオレフィン（ポリエチレン、ポリプロピレン、ポリ４−メチル−１−ペンテン、ポリブテン等）、ポリエステル（ポリエチレンテレフタレート、ポリブチレンテレフタレート、ポリエチレンナフタレート、ポリ乳酸等）、ポリアミド（ナイロン−６、ナイロン−６６、ポリメタキシレンアジパミド等）、を例示できる。これらのうちでは、ポリエチレン、ポリプロピレン、ポリエチレンテレフタレート、ポリ乳酸、ポリアミドが延伸性に優れ、形状保持性が良好な糸状物が得られるので好ましく、更には高密度ポリエチレン又はポリエチレンテレフタレートが好ましい。かかる原料は、用途に応じて適宜選択できるが、融点が１２０℃〜２５０℃が機械的特性、耐熱性等を満足する上で好ましい。ポリエチレンを使用する場合は、好ましくは密度が０．９４５ｇ／ｃｍ3以上、特に好ましくは０．９５５〜０．９７０ｇ／ｃｍ3、更に好ましくは０．９６０〜０．９７０ｇ／ｃｍ3、ゲル浸透クロマトグラフィ（ＧＰＣ）に基づく分子量分布（重量平均分子量（Ｍｗ）／（Ｍｎ））が５〜１５、好ましくは６〜１４、炭素数３〜６のαオレフィン含有量が２％未満、好ましくは０．０５〜１．５重量％の高密度ポリエチレンが、軽量で且つ剛性、強度、耐候性等に優れた糸状物が得られるので好ましい。
【０００７】
本発明に係わる形状保持性糸状延伸物（Ａ）は、本発明の形状保持性複合繊維の形状保持性に大きく寄与するものであり、９０度曲げによる戻り角度が１０度以下であることが好ましい。上記９０度曲げによる戻り角度が１０度を越えるものは、形状保持性を保持できない虞がある。ここに戻り角度は、糸状の場合は、図１（ａ）のように９０度折り曲げて５分間維持して放置したときの（ｂ）で示す戻り角度θが９０度曲げによる戻り角度である。また形状保持性糸状延伸物（Ａ）の曲げ強度（ＡＴＭＳ Ｄ７９０）が、好ましくは４００ｋｇ／ｃｍ2以上、更に好ましくは４７０ｋｇ／ｃｍ2以上であると形状保持性に優れている。
【０００８】
本発明に係る形状保持性糸状延伸物（Ａ）の形状は、断面が円形のもののみならず、楕円形、三角、四角、五角、六角等の多角形や、星型、歯車型等の異型のものであってもよい。また芯材に任意の突起物が設けられたものでもよく、例えば微細繊維が糸状から羽毛状に枝別れして形成されたものや繊維状物表面に突起が点在して設けられたものであってもよい。更に長手方向に溝あるいは筋が１本以上設けられたものであってもよい。また、太さは用途により適宜選択し得るが、通常は断面積が０．１〜１００ｍｍ2、好ましくは０．２〜１０ｍｍ2である。
【０００９】
形状保持性糸状延伸物（Ａ）の製造方法
本発明に係わる形状形状保持性糸状延伸物（Ａ）は、前記熱可塑性樹脂を種々公知の製造方法により製造できる。例えば、熱可塑性樹脂から所望の形状の原糸を溶融成形により製造し、一旦冷却した後、次いで、熱をかけて融点未満の温度で延伸することにより製造し得る。延伸温度は、形状保持性が発現できる程度に延伸するのに適した温度を、使用する樹脂により適宜選択し、通常は使用する樹脂の融点より低い温度で行う。例えば、原料がポリエチレンである場合は１００℃、好ましくは８５〜１００℃である。延伸倍率は原糸の性状や延伸温度によっても若干異なるが、塑性変形性が発現できる範囲で選択され、通常は降伏点以上破断点以下となるような範囲であって、２〜３０倍、好ましくは７〜１５倍程度である。延伸倍率が不足すると、９０度曲げによる戻り角度が１０度以下の形状保持性糸状延伸物（Ａ）が得られない。
【００１０】
本発明に係わる形状保持性糸状延伸物（Ａ）の原料である前記熱可塑性樹脂には、本発明の目的を損なわない範囲において、各種添加剤を配合することができる。このような添加剤としては、加工助剤、着色顔料、帯電防止剤、無機充填剤等を例示することができる。より具体的には、加工助剤として低分子量ポリオレフィン、脂環族ポリオレフィン、カルボキシル基や水酸基等を有する合成油、鉱物油、カルナバワックス等の植物油からなるワックス、酸化チタン、酸化亜鉛、炭化カルシウム、硫酸バリウム、シリカのような着色顔料乃至無機充填剤、各種タイプの界面活性剤からなる帯電防止剤等を例示することができる。これらはワックス類や帯電防止剤であれば、例えば、５重量％以下、好ましくは１重量％以下の割合で、または着色顔料や無機充填剤であれば、例えば１０重量％以下、好ましくは５重量％以下の割合で、それぞれ配合することができる。ワックス類の添加は、原糸の溶融成形や延伸において寸法精度を高めるのに有効であり、また着色顔料や無機充填剤の添加は、着色や増量効果以外に、形状保持性の改善に寄与する場合がある。
【００１１】
被覆層（Ｂ）
本発明に係る被覆層（Ｂ）は、形状保持性糸状延伸物（Ａ）よりも融点が低いものであれば良く、好ましくは１０度以上、更に好ましくは２０℃以上低く、且つ融点が８０℃以上の熱可塑性樹脂（Ｃ）であれば特に限定はされず、具体的には、ポリオレフィン（ポリエチレン、ポリプロピレン、ポリブテン、エチレン・α―オレフィン共重合体、プロピレン・α―オレフィン共重合体、ブテン・α―オレフィン共重合体等）、ポリエステル共重合体、エチレン・酢酸ビニル共重合体、エチレン・（メタ）アクリル酸エステル共重合体、エチレン・（メタ）アクリル酸共重合体等が挙げられる。これら熱可塑性樹脂（Ｃ）の中でもエチレン・メタアクリル酸（メタクリル酸とも呼ぶ）共重合体が、形状保持性糸状延伸物（Ａ）との接着性、熱融着性に優れるので好ましい。
【００１２】
被覆層（Ｂ）として、形状保持性糸状延伸物（Ａ）よりも融点が同じ或いは高い熱可塑性樹脂を用いた場合は、得られる形状保持性複合繊維を熱融着する際に、被覆層（Ｂ）のみならず、形状保持性糸状延伸物（Ａ）が溶融する虞があり、その結果、形状保持性を維持することができない虞がある。
【００１３】
本発明に係る被覆層（Ｂ）は、本発明の目的を損なわない範囲において、各種添加剤を配合することができる。このような添加剤としては、加工助剤、着色顔料、帯電防止剤、無機充填剤等を例示することができる。より具体的には、加工助剤として低分子量ポリオレフィン、脂環族ポリオレフィン、カルボキシル基や水酸基等を有する合成油、鉱物油、カルナバワックス等の植物油からなるワックス、酸化チタン、酸化亜鉛、炭化カルシウム、硫酸バリウム、シリカのような着色顔料乃至無機充填剤、各種タイプの界面活性剤からなる帯電防止剤等を例示することができる。これらはワックス類や帯電防止剤であれば、例えば、５重量％以下、好ましくは１重量％以下の割合で、または着色顔料や無機充填剤であれば、例えば１０重量％以下、好ましくは５重量％以下の割合で、それぞれ配合することができる。
【００１４】
形状保持性複合繊維
本発明の形状保持性複合繊維は、上記形状保持性糸状延伸物（Ａ）の表面に被覆層（Ｂ）を有する芯鞘構造をとっており、形状保持性糸状延伸物（Ａ）は形状保持性複合繊維の中心に位置するのみならず、中心からずれて偏芯構造をとっていても良い。形状保持性糸状延伸物（Ａ）の一部が形状保持性複合繊維（Ａ）の外表面に出たものであっても良いが、５０％以上、とくに３０％以上露出、換言すれば、被覆層（Ｂ）の覆う面積が５０％以下、とくに３０％以下の場合は、熱融着性が低下する虞がある。被覆層（Ｂ）の形状保持性糸状延伸物（Ａ）への被覆の厚さは、繊維の断面に対して均一でなくても良いし、均一であっても良い。形状保持性糸状延伸物（Ａ）が異型断面である場合には、形状保持性糸状延伸物（Ａ）の異型断面の形状と相似形の断面となるように被覆しても良い。
【００１５】
被覆層（Ｂ）の形状保持性糸状延伸物（Ａ）への被覆の厚さは用途に応じて適宜選択できる。形状保持性糸状延伸物（Ａ）の形状保持性をそのまま発現させる為には形状保持性糸状延伸物（Ａ）の断面に比べて薄いものが好ましいが、薄すぎると熱融着する場合、被覆層（Ｂ）が完全に溶解するばかりでなく、形状保持性糸状延伸物（Ａ）まで溶融軟化して形状保持性が損なわれる虞がある。また厚すぎると繊維が太くなるので取り扱いが不便になる。従って、形状保持性糸状延伸物（Ａ）と被覆層（Ｂ）の断面の面積割合で表すと好ましくは１０：１〜１：５、更に好ましくは５：１〜１：２である。
【００１６】
形状保持性複合繊維の製造方法
本発明の形状保持性複合繊維は、前記形状保持性糸状延伸物（Ａ）の表面に前記被覆層（Ｂ）を被覆する方法であれば特に限定されるものではないが、形状保持性糸状延伸物（Ａ）が形状保持性を維持できるようにする為に、形状保持性糸状延伸物（Ａ）の融点よりも低い温度で被覆するのが好ましい。例えば、形状保持性糸状延伸物（Ａ）の表面に形状保持性糸状延伸物（Ａ）よりも低い融点を有する熱可塑性樹脂（Ｃ）を溶融押出したり、かかる熱可塑性樹脂（Ｃ）からなる分散体又は溶液を、形状保持性糸状延伸物（Ａ）の表面に塗布した後乾燥させたり、形状保持性糸状延伸物（Ａ）をかかる分散体又は溶液の中に浸漬して含浸させた後乾燥させる方法を採ることができる。また形状保持性糸状延伸物（Ａ）を成形した後、一旦完全に冷却して被覆層（Ｂ）を形成しても良い。
【００１７】
本発明の形状保持性複合繊維は、形状保持性複合繊維同士を接着することもでき、出来上がったものは形状保持性を有している。例えば、複数本を一箇所に並列に並べたり、縦横に格子状に並べた後、熱をかけて形状保持性複合繊維の表面を溶融して形状保持性複合繊維同士を接着させることができる。こうすることによってシート状にしたりネット状にすることができる。
【００１８】
【発明の効果】
本発明の形状保持性複合繊維は、複数の形状保持性複合繊維を熱融着することによりネット等を製造したり、プラスチックフィルムあるいはシート若しくは紙等に形状保持性を付与するために、形状保持性複合繊維とかかるプラスチックフィルムと熱融着しても形状保持性が損なわれる虞がない。
【００１９】
【実施例１】
形状保持性糸状延伸物の作製
コモノマーとして１．２重量％のプロピレンを含む高密度ポリエチレン（コモノマー含量はＮＭＲにより測定、ＡＳＴＭ Ｄ１２３８により測定されたＭＦＲが０．３５ｇ／１０分、ゲル浸透クロマトグラフィ（ＧＰＣ）により測定された重量平均分子量（Ｍｗ）と数平均分子量（Ｍｎ）から算出されるＭｗ／Ｍｎが１２、ＡＳＴＭ Ｄ１５０５により測定された密度が０．９５８ｇ／ｃｍ3、融点１３５℃）を、下記の条件により溶融紡糸し、縦方向に延伸倍率１５倍で延伸した。
押出機：３０ｍｍφ（Ｌ／Ｄ＝２８、圧縮比２．３）
ダイ開口：３０ｍｍ×３．６ｍｍ
成形温度（シリンダー及びダイ）：２９０℃
冷却槽：１４００ｍｍ
引取り速度：４ｍ／分
延伸槽：９５℃水槽（長さ１７００ｍｍ）
アニール槽：１４０℃電熱オーブン（長さ２０００ｍｍ）
巻取り速度：５２ｍ／分
得られた形状保持性糸状延伸物の直径（最大厚み）をノギスで測定すると共に、図１に示す方法で、９０度折り曲げ後、５分間保持した後の戻り角度θを測定した。太さは３０００デニール（０．６８ｍｍ）であり、９０度折り曲げ戻り角度は９度であった。
【００２０】
形状保持性複合繊維の作成
得られた形状保持性糸状延伸物の表面に、エチレン・メタクリル酸共重合体（融点９６℃）を溶融押出し成形して被覆層を形成した。その断面は、被覆層が形状保持性糸状延伸物の表面に均一に形成さた芯鞘構造であって、その断面の形状保持性糸状延伸物と被覆層との面積割合は約１：２であった。得られた繊維の表面を加熱してポリエチレンフィルムの上にのせたところ、フィルムと接着し、繊維の部分でフィルムを折り曲げて放置したところ、フィルムは折り曲げた形状を保持することができた。
【００２１】
【実施例２】
実施例１で作成した形状保持性糸状延伸物の表面に、エチレン・メタクリル酸共重合体（融点９６℃）の液状物を塗布して被覆層を形成した。その断面は、被覆層が形状保持性糸状延伸物の表面に均一に形成さた芯鞘構造であって、その断面の形状保持性糸状延伸物と被覆層との面積割合は約４：１であった。同様の繊維を複数作成して並列に並べて加熱した。並べた繊維は繊維の表面が溶融してお互いに接着した。これを折り曲げて放置したところ、その折り曲げた形状を保持することができた。
【図面の簡単な説明】
【図１】 ９０度折り曲げ後の戻り角度を示す図面である。[0001]
[Technical field to which the invention belongs]
The present invention relates to a shape-retaining composite fiber whose shape-retaining property is not impaired even when heat-sealing.
[0002]
[Prior art]
Conventionally, metal such as wire and wire mesh has been used for molded products that require shape retention that does not return to the original shape even when bent or twisted. It is not suitable for the use of food and food packaging. In order to avoid this, some metals are covered with resin material or paper. However, when used in foods, it reacts to the contamination inspection by metal detectors performed at the inspection stage of food-related packaging. There is a problem at the inspection stage that the safety check at the previous final stage cannot be performed.
[0003]
As a method for solving such a problem, there has been proposed a composite plastic deformation product having a shape-retaining property composed of a composite stretched product having a core-sheath structure having polyethylene as a core material and other thermoplastic resin as a sheath material ( For example, see Patent Document 1). However, in such a composite plastic deformation product, not only the core part but also the sheath part is stretched, and as a result, the sheath part is also crystallized, so that there is a possibility that the heat-fusibility is inferior.
[Patent Document 1]
Japanese Patent Laid-Open No. 10-266035 (Claim 1)
[0004]
[Problems to be solved by the invention]
An object of the present invention is to obtain a shape-retaining composite fiber having shape retentivity even when the fiber surface is heated to be processed into a net shape or thermally fused to a film or the like.
[0005]
[Means for Solving the Problems]
That is, the present invention provides a thermoplastic resin (C) having a melting point lower than that of the shape-retaining thread-like stretched product (A) on the surface of the shape-retaining thread-like stretched product (A) having a return angle of 90 degrees or less when bent at 90 degrees. ) And a coating layer (B) coated or impregnated with a dispersion or solution, wherein the thermoplastic resin (C) is an ethylene / vinyl acetate copolymer, an ethylene / (meth) acrylic acid ester polymer. And a shape-retaining composite fiber that is at least one selected from ethylene / (meth) acrylic acid copolymers.
[0006]
DETAILED DESCRIPTION OF THE INVENTION
Shape-retaining thread-like stretched product (A)
The raw material of the shape-retaining thread stretched product (A) according to the present invention is not particularly limited as long as it is a thermoplastic resin having a higher melting point than the thermoplastic resin that is the raw material of the coating layer (B) described later. For example, polyolefin (polyethylene, polypropylene, poly-4-methyl-1-pentene, polybutene, etc.), polyester (polyethylene terephthalate, polybutylene terephthalate, polyethylene naphthalate, polylactic acid, etc.), polyamide (nylon-6, nylon-66, poly Metaxylene adipamide and the like). Among these, polyethylene, polypropylene, polyethylene terephthalate, polylactic acid, and polyamide are preferable because a filamentous material having excellent stretchability and good shape retention is obtained, and high-density polyethylene or polyethylene terephthalate is more preferable. Such a raw material can be appropriately selected depending on the use, but a melting point of 120 ° C. to 250 ° C. is preferable in terms of satisfying mechanical properties, heat resistance, and the like. When using polyethylene, preferably a density of 0.945 g / cm 3 or more, particularly preferably 0.955~0.970g / cm 3, more preferably 0.960~0.970g / cm 3, gel permeation chromatography The molecular weight distribution based on (GPC) (weight average molecular weight (Mw) / (Mn)) is 5 to 15, preferably 6 to 14, and the content of α-olefin having 3 to 6 carbon atoms is less than 2%, preferably 0.05. ˜1.5% by weight of high-density polyethylene is preferred because a filamentous material that is lightweight and excellent in rigidity, strength, weather resistance and the like can be obtained.
[0007]
The shape-retaining thread-like stretched product (A) according to the present invention greatly contributes to the shape-retaining property of the shape-retaining composite fiber of the present invention, and the return angle by 90-degree bending is preferably 10 degrees or less. . When the return angle by the 90-degree bending exceeds 10 degrees, there is a possibility that the shape retainability cannot be maintained. Here, in the case of a thread-like shape, the return angle θ shown in FIG. 1B when bent for 90 minutes and left to stand for 5 minutes as shown in FIG. In addition, the shape-retaining filamentary stretched product (A) has excellent shape-retaining properties when the bending strength (ATMS D790) is preferably 400 kg / cm 2 or more, more preferably 470 kg / cm 2 or more.
[0008]
The shape-retaining thread-like stretched product (A) according to the present invention has not only a circular cross-section, but also a polygon such as an ellipse, a triangle, a square, a pentagon, and a hexagon, and a variant such as a star or a gear. It may be. Also, the core material may be provided with arbitrary projections, for example, those in which fine fibers are branched from a thread shape to a feather shape, or those in which projections are scattered on the surface of the fibrous material. There may be. Further, one or more grooves or streaks may be provided in the longitudinal direction. Although it is appropriately selected depending on the thickness applications, typically the cross-sectional area 0.1 to 100 mm 2, preferably 0.2 to 10 mm 2.
[0009]
Method for producing shape-retained filamentous stretch (A) The shape-retainable filamentous stretch (A) according to the present invention can be produced by various known production methods for the thermoplastic resin. For example, it can be produced by producing a raw yarn of a desired shape from a thermoplastic resin by melt molding, once cooling, and then drawing at a temperature below the melting point by applying heat. As the stretching temperature, a temperature suitable for stretching to such an extent that shape retention can be expressed is appropriately selected depending on the resin used, and is usually performed at a temperature lower than the melting point of the resin used. For example, when the raw material is polyethylene, the temperature is 100 ° C, preferably 85 to 100 ° C. The draw ratio varies slightly depending on the properties of the raw yarn and the draw temperature, but is selected within a range where plastic deformability can be expressed, and is usually in a range where the yield point is greater than or equal to the break point, and is preferably 2 to 30 times. Is about 7 to 15 times. If the draw ratio is insufficient, a shape-retaining thread-like stretched product (A) having a return angle of 90 degrees or less by bending at 90 degrees cannot be obtained.
[0010]
Various additives can be blended with the thermoplastic resin, which is a raw material of the shape-retaining thread-like stretched product (A) according to the present invention, as long as the object of the present invention is not impaired. Examples of such additives include processing aids, color pigments, antistatic agents, inorganic fillers, and the like. More specifically, low molecular weight polyolefins, alicyclic polyolefins, synthetic oils having carboxyl groups or hydroxyl groups as processing aids, waxes made of vegetable oils such as mineral oils, carnauba waxes, titanium oxides, zinc oxides, calcium carbides, Examples thereof include coloring pigments such as barium sulfate and silica, inorganic fillers, and antistatic agents composed of various types of surfactants. If these are waxes or antistatic agents, for example, 5 wt% or less, preferably 1 wt% or less, or if they are color pigments or inorganic fillers, for example, 10 wt% or less, preferably 5 wt%. Each can be blended at a ratio of% or less. The addition of waxes is effective in increasing the dimensional accuracy in melt forming and drawing of the raw yarn, and the addition of color pigments and inorganic fillers contributes to the improvement of shape retention in addition to the effect of coloring and increasing the amount. There is a case.
[0011]
Coating layer (B)
The coating layer (B) according to the present invention only needs to have a melting point lower than that of the shape-retainable filamentous stretched product (A), preferably 10 degrees or more, more preferably 20 degrees C or more, and a melting point of 80 degrees C. The above thermoplastic resin (C) is not particularly limited, and specifically, polyolefin (polyethylene, polypropylene, polybutene, ethylene / α-olefin copolymer, propylene / α-olefin copolymer, butene / α-olefin copolymers), polyester copolymers, ethylene / vinyl acetate copolymers, ethylene / (meth) acrylic acid ester copolymers, ethylene / (meth) acrylic acid copolymers, and the like. Among these thermoplastic resins (C), an ethylene / methacrylic acid (also referred to as methacrylic acid) copolymer is preferable because it is excellent in adhesion to the shape-retaining thread-like stretched product (A) and heat fusion.
[0012]
When a thermoplastic resin having the same or higher melting point than the shape-retaining thread-like stretched product (A) is used as the coating layer (B), the coating layer ( In addition to B), the shape-retaining thread-like stretched product (A) may melt, and as a result, the shape-retaining property may not be maintained.
[0013]
The coating layer (B) according to the present invention can be blended with various additives as long as the object of the present invention is not impaired. Examples of such additives include processing aids, color pigments, antistatic agents, inorganic fillers, and the like. More specifically, low molecular weight polyolefins, alicyclic polyolefins, synthetic oils having carboxyl groups or hydroxyl groups as processing aids, waxes made of vegetable oils such as mineral oils, carnauba waxes, titanium oxides, zinc oxides, calcium carbides, Examples thereof include coloring pigments such as barium sulfate and silica, inorganic fillers, and antistatic agents composed of various types of surfactants. If these are waxes or antistatic agents, for example, 5 wt% or less, preferably 1 wt% or less, or if they are color pigments or inorganic fillers, for example, 10 wt% or less, preferably 5 wt%. Each can be blended at a ratio of% or less.
[0014]
Shape-retaining conjugate fiber The shape-retaining conjugate fiber of the present invention has a core-sheath structure having a coating layer (B) on the surface of the shape-retaining yarn-like stretched product (A), and has shape-retaining properties. The filamentous stretched product (A) is not only located at the center of the shape-retaining composite fiber, but may be offset from the center and have an eccentric structure. A part of the shape-retaining thread-like stretched product (A) may be exposed on the outer surface of the shape-retaining composite fiber (A), but it is exposed to 50% or more, particularly 30% or more, in other words, a coating. When the area covered by the layer (B) is 50% or less, particularly 30% or less, the heat-fusibility may be lowered. The coating thickness of the coating layer (B) on the shape-retaining thread-like stretched product (A) may or may not be uniform with respect to the cross section of the fiber. When the shape-retaining thread-like stretched product (A) has an atypical cross section, the shape-retaining thread-like stretched product (A) may be coated so as to have a cross-section similar to the shape of the atypical cross-section.
[0015]
The thickness of the coating on the shape-retaining thread-like stretched product (A) of the coating layer (B) can be appropriately selected depending on the application. In order to express the shape-retaining property of the shape-retaining thread-like stretched product (A) as it is, a thin one is preferable as compared to the cross-section of the shape-retaining thread-like stretched product (A). Not only the layer (B) is completely dissolved, but also the shape-retaining thread-like stretched product (A) is melted and softened and the shape-retaining property may be impaired. On the other hand, if the thickness is too thick, the fiber becomes thick and handling becomes inconvenient. Therefore, it is preferably 10: 1 to 1: 5, more preferably 5: 1 to 1: 2, in terms of the area ratio of the cross-sections of the shape-retaining thread-like stretched product (A) and the coating layer (B).
[0016]
Method for producing shape-retaining conjugate fiber The shape-retaining conjugate fiber of the present invention is particularly limited as long as it is a method for coating the coating layer (B) on the surface of the shape-retaining yarn-like stretched product (A). However, it is preferable that the shape-retaining thread-like stretched product (A) is coated at a temperature lower than the melting point of the shape-retaining thread-like stretched product (A) in order to maintain the shape-retaining property. . For example, a thermoplastic resin (C) having a melting point lower than that of the shape-retaining thread-like stretched product (A) is melt-extruded on the surface of the shape-retaining thread-like stretched product (A), or a dispersion comprising such a thermoplastic resin (C) The body or solution is applied to the surface of the shape-retaining thread-like stretched product (A) and then dried, or the shape-retaining thread-like stretched product (A) is immersed in such a dispersion or solution and then dried. Can be used. Further, after forming the shape-retainable filamentous stretched product (A), it may be completely cooled once to form the coating layer (B).
[0017]
The shape-retaining conjugate fiber of the present invention can also bond shape-retaining conjugate fibers, and the finished product has shape-retaining properties. For example, after arranging a plurality of fibers in parallel at one place or arranging them in a grid in the vertical and horizontal directions, the surface of the shape-retaining conjugate fibers can be melted by applying heat to bond the shape-retaining conjugate fibers together. By doing so, it can be formed into a sheet or net.
[0018]
【The invention's effect】
The shape-retaining conjugate fiber of the present invention is used to produce a net or the like by heat-sealing a plurality of shape-retaining conjugate fibers, or to impart shape-retaining properties to a plastic film, sheet or paper. There is no possibility that the shape retainability is impaired even if heat-bonding is performed between the functional composite fiber and the plastic film.
[0019]
[Example 1]
Production of shape-retained filamentous stretched product High-density polyethylene containing 1.2% by weight of propylene as a comonomer (comonomer content measured by NMR, MFR measured by ASTM D1238 is 0.35 g / 10 min, gel Mw / Mn calculated from weight average molecular weight (Mw) and number average molecular weight (Mn) measured by permeation chromatography (GPC) is 12, density measured by ASTM D1505 is 0.958 g / cm 3 , melting point 135 ° C. ) Was melt-spun under the following conditions and stretched in the machine direction at a stretch ratio of 15 times.
Extruder: 30 mmφ (L / D = 28, compression ratio 2.3)
Die opening: 30mm x 3.6mm
Molding temperature (cylinder and die): 290 ° C
Cooling tank: 1400mm
Take-off speed: 4 m / min Stretch tank: 95 ° C. water tank (length 1700 mm)
Annealing bath: 140 ° C electric heating oven (length: 2000 mm)
Winding speed: 52 m / min The diameter (maximum thickness) of the shape-retaining thread-like stretched product obtained was measured with a caliper, and the return angle θ after being held for 5 minutes after being bent 90 degrees by the method shown in FIG. Was measured. The thickness was 3000 denier (0.68 mm), and the 90-degree folding return angle was 9 degrees.
[0020]
Production of shape-retaining composite fiber An ethylene / methacrylic acid copolymer (melting point: 96C) was melt-extruded on the surface of the obtained shape-retaining thread-like stretched product to form a coating layer. The cross-section is a core-sheath structure in which the coating layer is uniformly formed on the surface of the shape-retaining thread-like stretched product, and the area ratio of the cross-sectional shape-retaining thread-like stretched product and the coating layer is about 1: 2. there were. When the surface of the obtained fiber was heated and placed on a polyethylene film, it was adhered to the film, and the film was folded at the fiber portion and allowed to stand. As a result, the film was able to maintain its folded shape.
[0021]
[Example 2]
A liquid material of an ethylene / methacrylic acid copolymer (melting point: 96 ° C.) was applied to the surface of the shape-retaining thread-like stretched product prepared in Example 1 to form a coating layer. The cross-section is a core-sheath structure in which the coating layer is uniformly formed on the surface of the shape-retaining thread-like stretched product, and the area ratio between the shape-retaining thread-like stretched product and the coating layer in the cross-section is about 4: 1. there were. A plurality of similar fibers were prepared and aligned and heated. The aligned fibers were bonded to each other as the fiber surfaces melted. When this was folded and allowed to stand, the bent shape could be retained.
[Brief description of the drawings]
FIG. 1 is a drawing showing a return angle after bending by 90 degrees.
Claims (4)
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| JP2003054788A JP4093880B2 (en) | 2003-02-28 | 2003-02-28 | Shape-retaining composite fiber |
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| JP2003054788A JP4093880B2 (en) | 2003-02-28 | 2003-02-28 | Shape-retaining composite fiber |
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| JP4706336B2 (en) * | 2005-05-31 | 2011-06-22 | 凸版印刷株式会社 | Paper lids and containers |
| JP2009095352A (en) * | 2007-10-12 | 2009-05-07 | Mitsui Chemicals Inc | Shoe keeper |
| JP4918027B2 (en) * | 2007-12-26 | 2012-04-18 | 積水成型工業株式会社 | Polyolefin resin woven sheet |
| WO2012026119A1 (en) * | 2010-08-25 | 2012-03-01 | 三井化学株式会社 | Shape retaining film and production method therefor, laminated film·tape, self-adhesive film·tape, anisotropic thermal conductive film, and shape retaining fiber |
| JP5255689B2 (en) * | 2011-12-14 | 2013-08-07 | 積水成型工業株式会社 | Polyolefin resin woven sheet |
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