JP4329515B2 - Sea-island type composite fiber - Google Patents

Sea-island type composite fiber Download PDF

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JP4329515B2
JP4329515B2 JP2003405542A JP2003405542A JP4329515B2 JP 4329515 B2 JP4329515 B2 JP 4329515B2 JP 2003405542 A JP2003405542 A JP 2003405542A JP 2003405542 A JP2003405542 A JP 2003405542A JP 4329515 B2 JP4329515 B2 JP 4329515B2
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island
sea
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JP2005163234A (en
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剛史 林
康男 福田
正幸 佐藤
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東レ株式会社
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本発明は、溶解分割処理によってポリプロピレンテレフタレート極細糸を製造できる海島型複合繊維に関し、さらに詳しくは分割性に優れかつ風合い、特にソフト感、発色性に優れたポリプロピレンテレフタレート極細糸を安定製造できる海島型複合繊維に関するものである。   The present invention relates to a sea-island type composite fiber capable of producing polypropylene terephthalate ultrafine yarns by dissolution division treatment, and more particularly, a sea-island type capable of stably producing polypropylene terephthalate ultrafine yarns having excellent splitting properties and texture, particularly soft feeling and color development. It relates to composite fibers.

従来よりポリエチレンテレフタレートからなる単糸繊度が1dtex以下のポリエステル極細糸はピーチ調織編物やワイピングクロスに用いられている。しかしながらポリエチレンテレフタレートからなる極細糸は屈折率が約1.6と高いため極細糸にした際の発色性が十分でなく、特に濃色での発色性が劣るため商品展開に制限があったり、またポリマ自体のヤング率が高いため十分なソフト感を付与することが出来なかった。   Conventionally, a polyester extra fine yarn made of polyethylene terephthalate and having a single yarn fineness of 1 dtex or less has been used for peach-woven fabrics and wiping cloths. However, the ultrafine yarn made of polyethylene terephthalate has a high refractive index of about 1.6, so the color developability when it is made into an ultrafine yarn is not sufficient, and the product development is particularly limited due to the poor color developability in dark colors. Since the Young's modulus of the polymer itself is high, a sufficient soft feeling could not be imparted.

また、ポリエチレンテレフタレート極細糸の製造方法として海島型複合繊維あるいは分割型複合繊維からポリエチレンテレフタレート極細糸を製造する方法が数多く提案されている。これらの複合繊維では分割の際にアルカリ処理により、一方の成分を減量・溶出加工することによってポリエチレンテレフタレート極細糸とするものであるが、減量加工の際に極細糸とすべきポリエチレンテレフタレート側の減量も同時に進行してしまうため、強度低下が生じ、実用に耐えられない場合があったり、逆に強度低下を抑制するために、減量加工条件を緩やかにすると分割処理が完全に行われないことがあり、製品品位の低下を招くことがあった。   In addition, as a method for producing polyethylene terephthalate ultrafine yarn, many methods for producing polyethylene terephthalate ultrafine yarn from sea-island type composite fibers or split type composite fibers have been proposed. These composite fibers are made of polyethylene terephthalate ultrafine yarn by alkali treatment at the time of division, and by reducing and elution processing one component, but the weight loss on the polyethylene terephthalate side that should be made ultrafine yarn at the time of weight reduction processing However, the strength may decrease and may not be able to withstand practical use, or conversely, in order to suppress the strength reduction, if the weight reduction processing conditions are moderated, the division process may not be performed completely. In some cases, the product quality was degraded.

一方、ポリプロピレンテレフタレート繊維は、伸長弾性回復率が優れ、ヤング率が低く、染色性が良好で、化学的にも安定しており、古くから知られている(特許文献1、2)。さらに、海島型複合繊維あるいは分割型複合繊維からポリプロピレンテレフタレート極細糸を製造する方法も提案されている(特許文献3、4)。しかし、いずれもアルカリ溶出成分として用いられているポリマは有機金属塩を共重合したポリエステルであり、アルカリ溶出時間が長く、生産性が悪かったり、また、ポリマ溶融温度がポリプロピレンテレフタレートよりも高いため、紡糸温度を高く保つ必要があり、そのためにポリプロピレンテレフタレートの熱劣化が進み、操業性が悪く、さらに、満足する原糸強度や風合いが得られないなどの問題があった。
特開昭52−5320号公報 特開昭52−8124号公報 特開平11−123330号公報 特開2001−348735号公報
Polypropylene terephthalate fiber, on the other hand, has an excellent elastic recovery rate, a low Young's modulus, good dyeability, is chemically stable, and has been known for a long time (Patent Documents 1 and 2). Furthermore, a method for producing polypropylene terephthalate ultrafine yarn from sea-island type composite fibers or split type composite fibers has also been proposed (Patent Documents 3 and 4). However, the polymer used as an alkali elution component is a polyester copolymerized with an organic metal salt, the alkali elution time is long, the productivity is poor, and the polymer melting temperature is higher than that of polypropylene terephthalate, It is necessary to keep the spinning temperature high, and as a result, the thermal deterioration of polypropylene terephthalate progresses, the operability is poor, and satisfactory raw yarn strength and texture cannot be obtained.
JP 52-5320 A Japanese Patent Laid-Open No. 52-8124 Japanese Patent Laid-Open No. 11-123330 JP 2001-348735 A

本発明は、上記従来技術では達成できなかった、生産性に優れ、衣料用織物としたときのソフト感、発色性に優れ、かつアルカリ処理後の廃液の環境負荷が小さいポリプロピレンテレフタレート極細糸を得ることのできる海島複合繊維を提供することにある。   The present invention provides a polypropylene terephthalate ultrafine yarn that has been unachievable by the above prior art, has excellent productivity, has a soft feeling when used as a woven fabric for clothing, excellent color developability, and has a low environmental impact of waste liquid after alkali treatment. It is to provide a sea-island composite fiber that can be used.

上記本発明の目的は以下の構成を採用することによって達成できる。すなわち、
(1)海成分ポリマがポリ乳酸で構成され、島成分ポリマがポリプロピレンテレフタレートで構成されている海島型複合繊維であって、海成分/島成分の複合比率が10/90〜50/50、原糸強度が3.0cN/dtex以上であることを特徴とする海島型複合繊維。
(2)島成分の単糸繊度が0.01〜1dtexであることを特徴とする前記(1)に記載の海島型複合繊維。
(3)島成分が3〜100個であることを特徴とする前記(1)または(2)のいずれか1項に記載の海島型複合繊維。
The object of the present invention can be achieved by employing the following configuration. That is,
(1) A sea-island composite fiber in which the sea component polymer is composed of polylactic acid and the island component polymer is composed of polypropylene terephthalate, and the composite ratio of sea component / island component is 10/90 to 50/50, A sea-island type composite fiber having a yarn strength of 3.0 cN / dtex or more.
(2) The island-island composite fiber according to (1) above, wherein the island component has a single yarn fineness of 0.01 to 1 dtex.
(3) The island-island composite fiber according to any one of (1) and (2), wherein the number of island components is 3 to 100.

本発明の海島型複合繊維を用いることによって分割性に優れるとともにソフト感、発色性に優れた織編物を得ることができる。   By using the sea-island type composite fiber of the present invention, it is possible to obtain a knitted or knitted fabric that is excellent in splitting properties and soft feeling and color developability.

本発明の海島型複合繊維は、海成分がポリ乳酸、島成分がポリプロピレンテレフタレートで構成されているものである。海成分としてポリ乳酸を配することにより、本発明の目的である原糸強度が高く、生産性の良い、風合いが優れ、且つ環境負荷の小さい海島型極細糸を得ることができるのである。   The sea-island type composite fiber of the present invention is composed of polylactic acid as the sea component and polypropylene terephthalate as the island component. By disposing polylactic acid as a sea component, it is possible to obtain a sea-island type ultrafine yarn having high yarn strength, good productivity, excellent texture, and low environmental load, which is the object of the present invention.

尚、本発明でいうポリ乳酸は、特に制限される物ではないが、平均分子量5万〜10万が好ましく、かつ純度95.0%〜99.5%のL−乳酸からなるポリ乳酸であれば工程での強度が維持できるほか、適度な生分解性が得られることから溶出した後の廃液の環境負荷が小さく好ましい。   The polylactic acid referred to in the present invention is not particularly limited, but is preferably a polylactic acid composed of L-lactic acid having an average molecular weight of 50,000 to 100,000 and a purity of 95.0% to 99.5%. In addition to being able to maintain strength in the process, moderate biodegradability can be obtained, so that the environmental load of the waste liquid after elution is small and preferable.

島成分のポリプロピレンテレフタレートとはテレフタル酸を主たる酸成分とし、1,3プロパンジオールを主たるグリコール成分として得られるポリエステルである。ただし、20モル%以下、好ましくは10モル%以下の割合で他のエステル結合を形成可能な共重合成分を含むものであっても良い。共重合可能な化合物として、たとえばイソフタル酸、シクロヘキサンジカルボン酸、アジピン酸、ダイマ酸、セバシン酸などのジカルボン酸類、一方、グリコール成分として、例えばエチレングリコール、ジエチレングリコール、ブタンジオール、ネオペンチルグリコール、シクロヘキサンジメタノール、ポリエチレングリコール、ポリプロピレングリコールなどを挙げることができるが、これらに限られるものではない。また、艶消剤として、二酸化チタン、滑剤としてのシリカやアルミナの微粒子、抗酸化剤として、ヒンダードフェノール誘導体、着色顔料などを必要に応じて添加することができる。   The island component polypropylene terephthalate is a polyester obtained by using terephthalic acid as a main acid component and 1,3 propanediol as a main glycol component. However, it may contain a copolymer component capable of forming another ester bond at a ratio of 20 mol% or less, preferably 10 mol% or less. As copolymerizable compounds, for example, dicarboxylic acids such as isophthalic acid, cyclohexanedicarboxylic acid, adipic acid, dimer acid, and sebacic acid, while as glycol components, for example, ethylene glycol, diethylene glycol, butanediol, neopentyl glycol, cyclohexanedimethanol , Polyethylene glycol, polypropylene glycol and the like can be mentioned, but are not limited thereto. Further, titanium dioxide as a matting agent, silica or alumina fine particles as a lubricant, hindered phenol derivatives, coloring pigments and the like as antioxidants can be added as necessary.

また、本発明の海島型複合繊維は海成分にポリ乳酸を配することにより、原糸操業性、工程通過性を維持するために必須である原糸強度を高めることが可能であり、原糸強度は3.0cN/dtex以上のものとする。原糸強度が3.0cN/dtex未満では、原糸強度が低すぎるため原糸操業性が悪化するとともに、高次工程においても単糸切れ、毛羽等の発生により工程通過性、製品品位の低下を生じてしまうのである。原糸操業性、工程通過性をより高めるためには原糸強度は3.3cN/dtex以上であることが好ましい。   In addition, the sea-island composite fiber of the present invention can increase the strength of the yarn that is essential for maintaining the yarn maneuverability and processability by arranging polylactic acid as the sea component. The strength is 3.0 cN / dtex or more. If the raw yarn strength is less than 3.0 cN / dtex, the raw yarn strength is too low and the operability of the raw yarn deteriorates. In addition, even in higher-order processes, single yarn breakage, fluff, etc. cause process passability and product quality deterioration. Will occur. In order to further improve the raw yarn operability and process passability, the raw yarn strength is preferably 3.3 cN / dtex or more.

本発明の海島型複合繊維の海成分/島成分の複合比率は複合形態の安定性、製糸性、生産性の点から10/90〜50/50とするものである。海成分の複合比率が10%未満の場合は、複合異常が発生し分割性不良を生じたり、複合形態が正常であっても海成分の溶解不良による分割性不良を生じ、十分なソフト感を得ることができない。逆に海成分の複合比率が50%を越えると、生産性が低下するとともに、織編物とした際に「ふかつき」が生じ、反発感のない織編物となってしまう。海島型複合繊維の海成分/島成分の複合比率は15/85〜40/60であることがより好ましい。   The sea component / island component composite ratio of the sea-island composite fiber of the present invention is 10/90 to 50/50 from the viewpoints of stability of the composite form, yarn-making property, and productivity. When the composite ratio of the sea component is less than 10%, a composite abnormality occurs, resulting in poor splitting, or even if the composite form is normal, poor splitting due to poor dissolution of the sea component results in sufficient softness. Can't get. On the other hand, when the composite ratio of the sea components exceeds 50%, the productivity is lowered, and when the woven or knitted fabric is formed, “futsukuki” is generated and the knitted or knitted fabric has no rebound. The sea / island component ratio of the sea-island composite fiber is more preferably 15/85 to 40/60.

また、本発明の海島型複合繊維は海成分を除去した後の島成分の単糸繊度はソフト感と発色性を両立するために0.01〜1dtexであることが好ましい。島成分の単糸繊度を0.01〜1dtexとすることによって、十分なソフト感と発色性、さらには製糸安定性を付与することができるのである。単糸繊度を0.01dtex以上にすると十分な発色性を発現することができ、また単糸繊度を1dtex以下とすると十分なソフト感を発現できる。島成分の単糸繊度のより好ましい範囲は0.05〜0.8dtexである。   Moreover, in the sea-island type composite fiber of the present invention, the single yarn fineness of the island component after removing the sea component is preferably 0.01 to 1 dtex in order to achieve both soft feeling and color development. By setting the single yarn fineness of the island component to 0.01 to 1 dtex, it is possible to impart sufficient softness and color developability as well as yarn production stability. When the single yarn fineness is 0.01 dtex or more, sufficient color development can be expressed, and when the single yarn fineness is 1 dtex or less, a sufficient soft feeling can be expressed. A more preferable range of the single yarn fineness of the island component is 0.05 to 0.8 dtex.

なお、海島型複合繊維の断面形状は丸断面の他、扁平、中空、三角等の異形断面であってもよい。また、繊維表面は海成分で完全に覆われていても、島成分が一部露出していてもかまわない。さらに海成分を除去した後の島成分の断面形状についても丸断面の他、扁平、三角等の異形断面であってもよい。   In addition, the cross-sectional shape of the sea-island type composite fiber may be an irregular cross section such as a flat shape, a hollow shape, and a triangular shape in addition to a round cross section. Further, the fiber surface may be completely covered with the sea component, or the island component may be partially exposed. Further, the cross-sectional shape of the island component after removing the sea component may be a cross-sectional shape such as a flat shape or a triangular shape in addition to the round cross-section.

本発明の海島型複合繊維は製糸性とソフト感を両立するために単繊維内の島成分数が3〜100個であることが好ましい。島成分数を3個以上にすると、海島型複合繊維の細繊度化によってソフト感を発現できる。また島成分数を100個以下にすると、製糸性とソフト感を両立でき、単繊維内の島成分数のより好ましい範囲は6〜80である。   In the sea-island type composite fiber of the present invention, the number of island components in the single fiber is preferably 3 to 100 in order to achieve both yarn-making property and soft feeling. When the number of island components is 3 or more, a soft feeling can be expressed by the fineness of the sea-island composite fibers. Moreover, when the number of island components is 100 or less, both the spinning property and the soft feeling can be achieved, and the more preferable range of the number of island components in the single fiber is 6 to 80.

本発明の海島型複合繊維は、例えば特開昭57−47938号公報の第3図や特開昭57−82526号公報の第2図に示される装置を好適な一例として使用して製造することができる。   The sea-island type composite fiber of the present invention is manufactured using, for example, the apparatus shown in FIG. 3 of JP-A-57-47938 or FIG. 2 of JP-A-57-82526 as a preferred example. Can do.

本発明の海島型複合繊維を製糸するにあたっては、紡糸および延伸工程を連続して行う方法、未延伸糸として一旦巻き取った後、延伸する方法、または高速製糸法など何れのプロセスにも適用できる。さらに必要に応じて仮撚や空気交絡等の糸加工を施しても良い。   In producing the sea-island type composite fiber of the present invention, it can be applied to any process such as a method in which spinning and drawing steps are continuously performed, a method in which the yarn is once wound as an undrawn yarn and then drawn, or a high-speed yarn making method. . Furthermore, yarn processing such as false twisting and air entanglement may be performed as necessary.

以下実施例により本発明をより詳細に説明する。なお実施例中の各特性値は次の方法で求めた。   Hereinafter, the present invention will be described in more detail with reference to examples. In addition, each characteristic value in an Example was calculated | required with the following method.

A.極限粘度[η]
オルソクロロフェノール10mlに対し試料0.10gを溶解し、温度25℃においてオストワルド粘度計を用いて測定した。
A. Intrinsic viscosity [η]
A sample of 0.10 g was dissolved in 10 ml of orthochlorophenol and measured using an Ostwald viscometer at a temperature of 25 ° C.

B.強度
JIS L1013(1999)に準じオリエンテック社製テンシロンUCT−100を用いて測定した。
B. Strength Measured according to JIS L1013 (1999) using Tensilon UCT-100 manufactured by Orientec Corporation.

C.風合い特性(ソフト性、発色性)
各項目とも、試料を基準試料との一対比較による官能試験を実施し、4段階評価した。そしてそれらを総合評価した。
C. Texture characteristics (softness, color development)
For each item, a sensory test was performed by paired comparison of the sample with a reference sample, and was evaluated in four stages. And they were evaluated comprehensively.

○○:極めて優れている
○ :優れている
△ :普通
× :劣っている
なお、基準試料には海成分溶解除去後の島成分繊度が0.05dtexのポリエチレンテレフタレートからなるPET系複合繊維を試料と同様に製織、アルカリ減量加工を施したものを用い、これを「劣っている」とした。
◯: Extremely excellent ○: Excellent △: Normal ×: Inferior In addition, as a reference sample, a PET-based composite fiber made of polyethylene terephthalate having an island component fineness of 0.05 dtex after dissolution and removal of sea components is used as a reference sample. We used weaving and alkali weight loss processing as in the case of, and this was considered “inferior”.

D.断面複合状態安定性
複合繊維を3%NaOH熱水溶液で海成分の複合比率+5%の減量率になるように処理して海成分を溶解除去後、厚さ5μmにカットし、分割状態を観察した。
D. Cross-section composite state stability The composite fiber was treated with a 3% NaOH hot water solution so that the weight ratio of the sea component was reduced to 5%, and the sea component was dissolved and removed, then cut to a thickness of 5 μm, and the split state was observed. .

○○:分割異常は全くなし
○ :分割異常の島成分数が全体の5%未満
△ :分割異常の島成分数が全体の5%以上10%未満
× :分割異常の島成分数が全体の10%以上
E.製糸性
紡糸時間24時間における糸切れ回数から製糸性を4段階評価した。
○: No division abnormality at all ○: Number of island components of division abnormality is less than 5% of the whole Δ: Number of island components of division abnormality is 5% or more and less than 10% of the whole ×: Number of island components of division abnormality is the whole 10% or more Spinning property The spinning property was evaluated in four stages from the number of yarn breakage in a spinning time of 24 hours.

○○:糸切れ無し
○ :糸切れ有り(1〜2回)
△ :糸切れ有り(3〜5回)
× :糸切れ多発(5回以上)
E.延伸性
2kg巻きパーンを100本作製する際の延伸糸切れ回数から延伸性を4段階評価した。
○○: No thread breakage ○: With thread breakage (1 to 2 times)
Δ: Thread breakage (3-5 times)
×: Many yarn breaks (more than 5 times)
E. Stretchability Stretchability was evaluated in four stages based on the number of stretched yarn breaks when 100 2 kg wound pans were produced.

○○:糸切れ率2%未満
○ :糸切れ率2%以上5%未満
△ :糸切れ率5%以上10%未満
× :糸切れ率10%以上
実施例1および比較例1
ジメチルテレフタル酸19.4kg、1,3−プロパンジオール15.2kgにテトラブチルチタネートを触媒として用い、140℃〜230℃でメタノールを留出しつつエステル交換反応を行った後、さらに、250℃温度一定の条件下で3.5時間重合を行い極限粘度[η]が0.96のポリプロピレンテレフタレートを得た。
○: Thread breakage rate less than 2% ○: Thread breakage rate 2% or more and less than 5% △: Thread breakage rate 5% or more and less than 10% ×: Thread breakage rate 10% or more Example 1 and Comparative Example 1
After transesterification was carried out while distilling methanol at 140 ° C to 230 ° C using tetrabutyl titanate as a catalyst in 19.4 kg of dimethylterephthalic acid and 15.2 kg of 1,3-propanediol, the temperature was kept constant at 250 ° C. Polymerization was performed for 3.5 hours under the above conditions to obtain polypropylene terephthalate having an intrinsic viscosity [η] of 0.96.

上記製法で得たポリプロピレンテレフタレートを島成分に用い、海成分として光学純度98.0%のポリ−L−乳酸を用い、海/島=20/80の複合比率にて、島成分数70、ホール数12の海島型複合用口金を用いて複合紡糸機にて紡糸温度250℃、引き取り速度1500m/分で巻き取った。続いて、該未延伸糸を通常のホットロール−ホットロール系延伸機を用いて延伸温度80℃、熱セット温度120℃で延伸糸の伸度が35%となるように延伸倍率を合わせて延伸を行い、56dtex−12filの延伸糸を得た。得られた延伸糸の糸物性を表1に示す。   Polypropylene terephthalate obtained by the above production method is used as an island component, poly-L-lactic acid having an optical purity of 98.0% is used as a sea component, and the number of island components is 70, at a composite ratio of sea / island = 20/80. Winding-up was performed at a spinning temperature of 250 ° C. and a take-up speed of 1500 m / min using a composite spinning machine using a number of sea-island type composite bases. Subsequently, the undrawn yarn is drawn using a normal hot roll-hot roll drawing machine at a drawing temperature of 80 ° C. and a heat setting temperature of 120 ° C. so that the drawn yarn has an elongation of 35%. And a 56 dtex-12 fil drawn yarn was obtained. Table 1 shows the yarn physical properties of the obtained drawn yarn.

得られた延伸糸を2本合糸した後、200t/mの甘撚を施し、経糸および緯糸に使用して平織物を製織し、95℃の熱水で精練した後、160℃で乾熱セットを行い、さらに98℃の炭酸ソーダ3%水溶液で減量加工し、次いで湿熱125℃で染色、乾熱160℃で仕上げセットを行った。得られた織物特性について評価した結果を表1に示す。   After the two drawn yarns were combined, they were subjected to a sweet twist of 200 t / m, woven into a plain fabric using warps and wefts, scoured with hot water at 95 ° C., and then dried at 160 ° C. After setting, the weight was reduced with a 3% aqueous solution of sodium carbonate at 98 ° C., followed by dyeing at a wet heat of 125 ° C. and finish setting at a dry heat of 160 ° C. Table 1 shows the results of evaluation of the obtained fabric characteristics.

実施例1では複合状態安定性、製糸性、延伸性が良好であり、また得られた織物はソフト感、発色性が良好なものであった。   In Example 1, the composite state stability, the yarn forming property, and the stretchability were good, and the obtained woven fabric had a good soft feeling and good color developability.

一方、比較例1は海成分として5−ナトリウムスルホイソフタル酸4.5モル%共重合した極限粘度[η]が0.56のポリエチレンテレフタレートを用い、実施例1と同様の口金、複合紡糸機を用いて紡糸温度280℃、引き取り速度1500m/分で巻き取り、得られた未延伸糸を実施例1と同様の方法で延伸糸を得た。得られた延伸糸を実施例1と同様の方法で製織、加工を行い織物を得た。延伸糸物性と織物について評価した結果を表1に示す。製糸性、延伸性が良くなく、発色性の劣る織物しか得られなかった。   On the other hand, Comparative Example 1 uses polyethylene terephthalate having an intrinsic viscosity [η] of 0.56 copolymerized with 4.5 mol% of 5-sodium sulfoisophthalic acid as a sea component, and uses the same die and compound spinning machine as Example 1. Winding was performed at a spinning temperature of 280 ° C. and a take-up speed of 1500 m / min, and the obtained undrawn yarn was obtained in the same manner as in Example 1. The obtained drawn yarn was woven and processed in the same manner as in Example 1 to obtain a woven fabric. Table 1 shows the results of evaluating the properties of the drawn yarn and the woven fabric. Only a woven fabric with poor yarn forming and stretchability and poor color developability was obtained.

実施例2〜、比較例2〜3
海/島複合比率を表2に示すように変更し、実施例1と同様の方法にて延伸糸および織物を得た。得られた延伸糸物性、織物評価の結果を表2に示す。
Example 2-3, Comparative Examples 2-3
The sea / island composite ratio was changed as shown in Table 2, and drawn yarn and woven fabric were obtained in the same manner as in Example 1. Table 2 shows the properties of the obtained drawn yarn and the evaluation of the fabric.

実施例2および3では複合状態安定性、製糸性、延伸性が良好であり、得られた織物はソフト感、発色性が良好なものであった。   In Examples 2 and 3, the composite state stability, the yarn forming property, and the stretchability were good, and the resulting woven fabric had good softness and color developability.

一方、比較例2は、海成分の複合比率5%と低いため、海成分を溶解除去しても海成分が完全に分解していない複合異常が観察され、この複合異常が発生することによりソフト感に劣る織物しか得られなかった。   On the other hand, in Comparative Example 2, since the composite ratio of the sea component is as low as 5%, a composite abnormality in which the sea component is not completely decomposed even if the sea component is dissolved and removed is observed. Only woven fabrics with inferior feeling were obtained.

また、比較例3では海成分の複合比率55%と高いため、製糸性、延伸性が若干劣ると共に、海成分除去によって繊維間の空隙が大きく形成されることによってふかついたタッチの織物しか得られなかった。   Further, in Comparative Example 3, since the sea component composite ratio is as high as 55%, the yarn-making property and stretchability are slightly inferior, and only the woven fabric with a touch is obtained by forming a large gap between the fibers by removing the sea component. I couldn't.

実施例5〜
島成分数を表のように変更し、ホール数36の海島複合用口金を用いて複合比率20/80で実施例1と同様の方法で紡糸、延伸を行い、84dtex−36filの延伸糸を得た。得られた延伸糸の糸物性を表3に示す。
Example 5-8
The number of island components was changed as shown in Table 3 , and spinning and drawing were performed in the same manner as in Example 1 at a compound ratio of 20/80 using a sea-island compound base with a hole number of 36, and an 84 dtex-36 fil drawn yarn was obtained. Obtained. Table 3 shows the yarn physical properties of the obtained drawn yarn.

得られた延伸糸を実施例1と同様の方法で製織、加工を行い、得られた織物特性について評価した結果を表3に示す。   Table 3 shows the results obtained by weaving and processing the obtained drawn yarn in the same manner as in Example 1 and evaluating the obtained fabric characteristics.

いずれの実施例においても、複合状態安定性、製糸性、延伸性や風合い特性は良好なものであったが、実施例6〜8では島成分繊度と原糸強度とのバランスが良く特に風合い特性の優れた織物を得ることが出来た。   In any of the examples, the composite state stability, the yarn forming property, the stretchability and the texture characteristics were good. However, in Examples 6 to 8, the balance between the island component fineness and the raw yarn strength was good, and particularly the texture characteristics. We were able to obtain an excellent fabric.

Claims (3)

海成分ポリマが純度95.0%〜99.5%の乳酸からなる平均分子量5万〜10万のポリ乳酸で構成され、島成分ポリマがポリプロピレンテレフタレートで構成されている海島型複合繊維であって、海成分/島成分の複合比率が10/90〜50/50、原糸強度が3.3cN/dtex以上であることを特徴とする海島型複合繊維。 A sea-island type composite fiber in which a sea component polymer is composed of lactic acid having a purity of 95.0% to 99.5% and having an average molecular weight of 50,000 to 100,000, and an island component polymer is composed of polypropylene terephthalate. A sea-island type composite fiber, wherein the composite ratio of sea component / island component is 10/90 to 50/50, and the raw yarn strength is 3.3 cN / dtex or more. 島成分の単糸繊度が0.01〜1dtexであることを特徴とする請求項1に記載の海島型複合繊維。   The island-island composite fiber according to claim 1, wherein the island component has a single yarn fineness of 0.01 to 1 dtex. 島成分が3〜100個であることを特徴とする請求項1または2のいずれか1項に記載の海島型複合繊維。   The island-island composite fiber according to any one of claims 1 and 2, wherein the number of island components is 3 to 100.
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