JP4890477B2 - Polypropylene fibers and textile products - Google Patents

Polypropylene fibers and textile products Download PDF

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JP4890477B2
JP4890477B2 JP2008021130A JP2008021130A JP4890477B2 JP 4890477 B2 JP4890477 B2 JP 4890477B2 JP 2008021130 A JP2008021130 A JP 2008021130A JP 2008021130 A JP2008021130 A JP 2008021130A JP 4890477 B2 JP4890477 B2 JP 4890477B2
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resin
polypropylene
fiber
core
sheath
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JP2009179914A (en
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英征 五十嵐
明 五十嵐
昇 内藤
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Mitsubishi Chemical Corp
Mitsubishi Rayon Co Ltd
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Description

本発明は、ポリプロピレン系繊維及びその繊維を用いた繊維製品に関する。   The present invention relates to a polypropylene fiber and a fiber product using the fiber.

ポリプロピレン繊維は、嵩高性、軽量性、撥水性等に優れていることから、繊維製品や、養生シート、建築工事用シート等の産業用途に広く用いられ、特にカーペットに多用されている。しかしながら、カーペット分野において、ポリプロピレン繊維を、車両用途、例えばラインマットやオプションマット等に使用するときには、カーペット製織(タフト)後に、さらに各種模様に立体的に熱賦型するための成型加工を必要とするが、この成型加工時の熱処理温度によって捲縮形態の変形、繊維の溶断等の問題が発生し、ポリプロピレン繊維を車両用途のカーペットに用いることは困難であった。一般に、ポリプロピレン繊維製カーペットの成型加工温度は、ほぼ150℃であるが、前記のような用途では、複雑な立体熱賦型の際は成型加工温度を165℃以上とすることが必要になる。   Since polypropylene fibers are excellent in bulkiness, lightness, water repellency and the like, they are widely used in industrial applications such as textile products, curing sheets, and building construction sheets, and are particularly frequently used in carpets. However, in the carpet field, when polypropylene fibers are used for vehicle applications such as line mats and option mats, a molding process is required for three-dimensional heat forming into various patterns after carpet weaving (tufting). However, the heat treatment temperature at the time of molding causes problems such as deformation of the crimped form and fusing of the fibers, and it has been difficult to use polypropylene fibers for carpets for vehicles. In general, the molding temperature of polypropylene fiber carpet is approximately 150 ° C., but in the above-described applications, it is necessary to set the molding temperature to 165 ° C. or more when performing complex three-dimensional heat forming.

そこで、成型加工での熱変形等のないカーペットを得るには、カーペット原糸にクリープ特性の良好な耐熱性のポリプロピレン繊維を用いることが必要になるが、耐熱性のポリプロピレン繊維を得るためには、いくつかの問題点がある。具体的には、ポリプロピレン樹脂が、他の樹脂、例えばポリエステル樹脂やポリアミド樹脂等と比べ、その融点が低いこと、またその融点を高くすることもできず、そのため、耐熱性のポリプロピレン繊維を得ることも困難であった。   Therefore, in order to obtain a carpet that does not undergo thermal deformation during molding, it is necessary to use heat-resistant polypropylene fibers with good creep characteristics for the carpet yarn, but in order to obtain heat-resistant polypropylene fibers. There are some problems. Specifically, a polypropylene resin has a lower melting point than other resins such as a polyester resin and a polyamide resin, and the melting point cannot be increased. Therefore, a heat-resistant polypropylene fiber is obtained. It was also difficult.

従来より、耐熱性のポリプロピレン繊維の開発については、数多く提案がなされてきたが、ポリプロピレン樹脂に他の高融点樹脂をブレンドし溶融紡糸しようとしても、ポリプロピレン樹脂は他の樹脂との相溶性が悪く、製糸安定性が悪くなる。特に、延伸時に樹脂間に剥離が生じ製糸ができなくなる。また、一方に高融点樹脂、他方にポリプロピレン系樹脂を配した複合繊維も提案されている。例えば、特許文献1、2には、鞘成分をナイロン樹脂、芯成分をナイロン樹脂とポリオレフィン樹脂の混合物とした複合繊維が提案され、また、特許文献2には、プロピレン樹脂とエチレン性不飽和カルボン酸またはその無水物変性プロピレン樹脂とポリアミド樹脂の混合物からなる繊維が提案されているが、特許文献1、2の技術は、芯成分に低比重のポリオレフィン樹脂を混合して軽量のポリアミド系繊維を得るもので、耐熱性を高める技術ではない。   Conventionally, many proposals have been made for the development of heat-resistant polypropylene fibers. However, when polypropylene resin is blended with other high-melting-point resins and melt spinning is performed, polypropylene resins have poor compatibility with other resins. As a result, the yarn production stability is deteriorated. In particular, peeling occurs between the resins at the time of drawing, and the yarn cannot be produced. In addition, a composite fiber in which a high melting point resin is arranged on one side and a polypropylene resin is arranged on the other side has been proposed. For example, Patent Documents 1 and 2 propose a composite fiber in which a sheath component is a nylon resin and a core component is a mixture of a nylon resin and a polyolefin resin, and Patent Document 2 discloses a propylene resin and an ethylenically unsaturated carboxylic acid. A fiber made of a mixture of an acid or anhydride-modified propylene resin and a polyamide resin has been proposed. However, the techniques of Patent Documents 1 and 2 are mixed with a polyolefin resin having a low specific gravity in the core component to produce a lightweight polyamide fiber. It is not a technology to improve heat resistance.

また、特許文献3には、ポリアミド樹脂とポリプロピレン樹脂との複合繊維が提案されているが、この繊維は、非相溶性樹脂を用いた分割繊維であって、耐熱性を高めるためのものではない。さらに、特許文献4には、鞘部がポリオレフィン樹脂、芯部が鞘部樹脂より高融点の他の樹脂からなる複合繊維が提案されているが、この繊維は、熱接着性繊維であり、耐熱性を高めたものではない。また、特許文献5には、ポリプロピレン樹脂と編成ポリオレフィン樹脂とポリアミド樹脂とからなる繊維が提案されているが、この繊維は、熱接着性と高周波融着性を有する繊維であり、耐熱性を高めたものではない。   Patent Document 3 proposes a composite fiber of a polyamide resin and a polypropylene resin, but this fiber is a split fiber using an incompatible resin and is not intended to increase heat resistance. . Further, Patent Document 4 proposes a composite fiber having a sheath part made of a polyolefin resin and a core part made of another resin having a melting point higher than that of the sheath part resin. It is not something that enhances sex. Patent Document 5 proposes a fiber composed of a polypropylene resin, a knitted polyolefin resin, and a polyamide resin. This fiber is a fiber having thermal adhesiveness and high-frequency fusibility, and has improved heat resistance. Not a thing.

特開平4−272222号公報JP-A-4-272222 特開平4−281015号公報JP-A-4-281015 特開2000−129538号公報JP 2000-129538 A 特開平2−145811号公報Japanese Patent Laid-Open No. 2-14581 特開昭60−134013号公報JP 60-134013 A

本発明の目的は、このような従来技術における問題点を解決するものであり、製糸時に層間剥離がなく製糸安定性に優れ、かつ170℃の乾熱雰囲気下で乾熱処理した後も熱変形や溶断しない良好なクリープ特性を有し、耐熱性のあるポリプロピレン繊維を提供し、またその繊維を用いた繊維製品を提供することにある。   The object of the present invention is to solve such problems in the prior art, without delamination at the time of yarn production, excellent in yarn production stability, and after heat treatment in a dry heat atmosphere at 170 ° C. An object of the present invention is to provide a polypropylene fiber having good creep characteristics that does not melt and having heat resistance, and to provide a fiber product using the fiber.

本発明の要旨は、芯成分がポリアミド樹脂と無水マレイン酸変性ポリプロピレン樹脂との混合物からなり、鞘成分がポリプロピレン樹脂と無水マレイン酸変性ポリプロピレン樹脂との混合物からなる芯鞘複合構造を有し、170℃の乾熱雰囲気下で乾熱処理した後の(繊度(dtex)×1/11g)荷重時の伸長率が10%以下であるポリプロピレン系繊維、及び、前記ポリプロピレン系繊維を含む繊維製品、にある。   The gist of the present invention is that the core component comprises a mixture of a polyamide resin and a maleic anhydride-modified polypropylene resin, and the sheath component has a core-sheath composite structure comprising a mixture of the polypropylene resin and the maleic anhydride-modified polypropylene resin. A polypropylene fiber having an elongation rate of 10% or less after being subjected to a dry heat treatment in a dry heat atmosphere at ° C. (fineness (dtex) × 1/11 g), and a fiber product including the polypropylene fiber .

本発明によれば、本発明のポリプロピレン系繊維は、従来からのポリプロピレン系繊維では達成困難であった耐熱性が要求される繊維製品、特に加熱成型加工が必要となるカーペットの製造を可能とするものであり、また、このポリプロピレン系繊維を溶融紡糸によって製糸する際の、芯鞘界面での層間剥離がなく、紡糸安定性、延伸安定性及び捲縮安定性に優れ、また繊維製品とする際、特にカーペットのタフト工程の通過性にも優れる。さらに、本発明のポリプロピレン系繊維は、乾熱雰囲気下での熱変形がなく良好なクリープ特性を有し、繊維製品にソフトな風合いで、嵩高性を与えるとともに、繊維製品、特にカーペットの成型加工に耐える耐熱性を有する。   According to the present invention, the polypropylene fiber of the present invention enables the production of a fiber product that requires heat resistance, which is difficult to achieve with conventional polypropylene fibers, particularly carpets that require heat molding. When this polypropylene fiber is produced by melt spinning, there is no delamination at the core-sheath interface, and it has excellent spinning stability, stretching stability and crimp stability. In particular, the carpet is excellent in passage through the tufting process. Furthermore, the polypropylene fiber of the present invention has good creep characteristics without thermal deformation in a dry heat atmosphere, gives the fiber product a soft texture and bulkiness, and is a fiber product, especially carpet molding processing. Heat resistance.

本発明のポリプロピレン系繊維は、芯成分がポリアミド樹脂と無水マレイン酸変性ポリプロピレン樹脂との混合物からなり、鞘成分がポリプロピレン樹脂と無水マレイン酸変性ポリプロピレン樹脂との混合物からなる、芯鞘複合構造を有する。   The polypropylene fiber of the present invention has a core-sheath composite structure in which the core component is composed of a mixture of polyamide resin and maleic anhydride-modified polypropylene resin, and the sheath component is composed of a mixture of polypropylene resin and maleic anhydride-modified polypropylene resin. .

芯成分の構成成分であるポリアミド樹脂としては、ナイロン6樹脂、ナイロン66樹脂、ナイロン12樹脂等が挙げられ、特に限定はなく、結晶性又は非結晶性であってもよいが、芯鞘複合紡糸するうえで、鞘成分のなかのポリプロピレン樹脂との融点差が80℃以下、さらには70℃以下であるポリアミド樹脂が好ましく、比較的ポリプロピレン樹脂との融点が近いナイロン6樹脂がより好ましいものとして挙げられる。また、芯成分の構成成分である無水マレイン酸変性ポリプロピレン樹脂としては、無水マレイン酸にて変性したポリプロピレン樹脂であり、無水マレイン酸グラフトポリプロピレン樹脂が好ましいものとして挙げられる。   Examples of the polyamide resin that is a constituent component of the core component include nylon 6 resin, nylon 66 resin, nylon 12 resin, and the like. There is no particular limitation, and the core-sheath composite spinning may be crystalline or amorphous. In view of this, a polyamide resin having a melting point difference of 80 ° C. or less, more preferably 70 ° C. or less, and a nylon 6 resin having a relatively close melting point to the polypropylene resin is more preferable. It is done. The maleic anhydride-modified polypropylene resin that is a constituent component of the core component is a polypropylene resin modified with maleic anhydride, and a maleic anhydride-grafted polypropylene resin is preferable.

鞘成分の構成成分であるポリプロピレン樹脂としては、プロピレンホモポリマーであってもよいし、プロピレンを主成分とするエチレン、1−ブテン等の他のオレフィンとのコポリマーであってもよい。また、鞘成分の構成成分である無水マレイン酸変性ポリプロピレン樹脂としては、芯成分の構成成分である無水マレイン酸変性ポリプロピレン樹脂と同じものが用いられる。芯成分及び鞘成分の無水マレイン酸変性ポリプロピレン樹脂は、ポリアミド樹脂とポリプロピレン樹脂との相溶化剤として機能する。かかる機能は、無水マレイン酸変性ポリプロピレン樹脂の主骨格がポリプロピレンであることから、ポリプロピレン樹脂との親和性を示し、また無水マレイン酸変性ポリプロピレン樹脂中のカルボキシル基とポリアミド樹脂中のアミノ基とが一部反応してグラフト共重合することによるものである。   The polypropylene resin that is a constituent component of the sheath component may be a propylene homopolymer or a copolymer with other olefins such as ethylene and 1-butene containing propylene as a main component. The maleic anhydride-modified polypropylene resin that is a constituent component of the sheath component is the same as the maleic anhydride-modified polypropylene resin that is a constituent component of the core component. The maleic anhydride-modified polypropylene resin of the core component and the sheath component functions as a compatibilizing agent for the polyamide resin and the polypropylene resin. Such a function shows affinity with the polypropylene resin because the main skeleton of the maleic anhydride-modified polypropylene resin is polypropylene, and the carboxyl group in the maleic anhydride-modified polypropylene resin is identical to the amino group in the polyamide resin. This is due to partial reaction and graft copolymerization.

また、本発明のポリプロピレン系繊維は、170℃の乾熱雰囲気下で乾熱処理した後の(繊度(dtex)×1/11g)荷重時の伸長率が10%以下、好ましくは5%以下であることが必要である。170℃の乾熱雰囲気下で乾熱処理した後の伸長率が10%以下であることにより、カーペットに立体的な熱賦型する165℃での成型加工においても、溶断による虫食い等の問題がなく良好な加工性が得られる。   In addition, the polypropylene fiber of the present invention has an elongation rate of 10% or less, preferably 5% or less after being subjected to dry heat treatment in a dry heat atmosphere at 170 ° C. (fineness (dtex) × 1/11 g). It is necessary. Since the elongation rate after dry heat treatment in a dry heat atmosphere at 170 ° C. is 10% or less, there is no problem such as insect erosion due to fusing even in the molding process at 165 ° C., which is three-dimensionally heat-molded on the carpet. Good workability can be obtained.

特に、本発明においては、ポリプロピレン系繊維が、170℃の乾熱雰囲気下で乾熱処理した後の(dtex×1/11)g荷重時の伸長率が10%以下であるためには、芯成分がポリアミド樹脂60〜90質量%と無水マレイン酸変性ポリプロピレン樹脂40〜10質量%の混合物、鞘成分がポリプロピレン樹脂60〜90質量%と無水マレイン酸変性ポリプロピレン樹脂40〜10質量%の混合物であることが好ましい。芯成分及び鞘成分の構成成分である無水マレイン酸変性ポリプロピレン樹脂が10質量%未満では、相溶化剤としての機能効果が不十分であり、40質量%を超えると、繊維強度等の物性の低下、製糸安定性の低下を招き易くなる。   In particular, in the present invention, since the polypropylene fiber has an elongation rate of 10% or less after (dtex × 1/11) g load after dry heat treatment in a dry heat atmosphere at 170 ° C., the core component Is a mixture of 60 to 90% by mass of polyamide resin and 40 to 10% by mass of maleic anhydride-modified polypropylene resin, and the sheath component is a mixture of 60 to 90% by mass of polypropylene resin and 40 to 10% by mass of maleic anhydride-modified polypropylene resin. Is preferred. If the maleic anhydride-modified polypropylene resin that is a constituent component of the core component and the sheath component is less than 10% by mass, the functional effect as a compatibilizer is insufficient, and if it exceeds 40% by mass, the physical properties such as fiber strength are deteriorated. This tends to cause a decrease in the stability of yarn production.

さらに、本発明においては、芯成分がポリアミド樹脂60〜80質量%と無水マレイン酸変性ポリプロピレン樹脂40〜20質量%の混合物、鞘成分がポリプロピレン樹脂60〜80質量%と無水マレイン酸変性ポリプロピレン樹脂40〜20質量%の混合物であることがより好ましい。   Further, in the present invention, the core component is a mixture of 60 to 80% by mass of polyamide resin and 40 to 20% by mass of maleic anhydride-modified polypropylene resin, and the sheath component is 60 to 80% by mass of polypropylene resin and maleic anhydride-modified polypropylene resin 40. More preferably, the mixture is ˜20% by mass.

また、本発明のポリプロピレン系繊維における芯成分及び鞘成分、特に鞘成分には、繊維特性を損なわない範囲で、リン化合物、含臭素化合物等からなる難燃剤、ヒンダードアミン系化合物等からなる耐光安定剤、酸化防止剤、マイカ、タルク、酸化チタン、炭酸カルシウム、シリカ等の充填剤、蛍光増白剤、着色用染・顔料等が含まれていてもよい。   In addition, the core component and the sheath component in the polypropylene fiber of the present invention, particularly the sheath component, is a flame retardant composed of a phosphorus compound, a bromine-containing compound, etc., a light-resistant stabilizer composed of a hindered amine compound, etc., as long as the fiber characteristics are not impaired. , Antioxidants, fillers such as mica, talc, titanium oxide, calcium carbonate and silica, fluorescent brighteners, coloring dyes and pigments, and the like may be contained.

さらに、本発明のポリプロピレン系繊維は、その有する捲縮率が5〜20%であることが好ましい。捲縮率が5%未満であると、繊維製品、特にカーペットにする際も糸の伸縮性が低く、ニードル前の張力の変動を吸収できず、またルーパーから糸が外れ難く製織工程、特にタフト工程での通過性が悪化し、また、糸の伸縮性が低くなることから、巻き取り前の張力の変動が吸収できず、製糸性自体を低下させる。また、捲縮率が20%を超えると、繊維製品、特にカーペットにいた際に、ソフト感に乏しいものとなる。   Furthermore, the polypropylene fiber of the present invention preferably has a crimp rate of 5 to 20%. When the crimping ratio is less than 5%, the yarn stretchability is low even in textile products, especially carpets, the fluctuation of tension before the needle cannot be absorbed, and the yarn does not easily come off from the looper. Since the passability in the process deteriorates and the stretchability of the yarn becomes low, fluctuations in tension before winding cannot be absorbed, and the yarn-making property itself is lowered. On the other hand, when the crimp rate exceeds 20%, the softness is poor when the fabric product is in a carpet.

本発明のポリプロピレン系繊維においては、芯鞘比は体積比で1:1〜1:2であるこが好ましく、繊維断面は円形断面、三角断面等の異形断面、芯部に空洞のある中空断面等任意の断面形状であってよく、繊度も任意であってもよい。   In the polypropylene fiber of the present invention, the core-sheath ratio is preferably 1: 1 to 1: 2 in volume ratio, the fiber cross section is a circular cross section, a deformed cross section such as a triangular cross section, a hollow cross section having a hollow in the core, etc. Any cross-sectional shape may be used, and the fineness may also be arbitrary.

次に、本発明のポリプロピレン系繊維の製造方法について説明する。
本発明のポリプロピレン系繊維は、芯鞘型のポリプロピレン複合繊維を製造する公知の溶融紡糸方法によって製造することができる。
Next, the manufacturing method of the polypropylene fiber of this invention is demonstrated.
The polypropylene fiber of the present invention can be produced by a known melt spinning method for producing a core-sheath type polypropylene composite fiber.

ポリプロピレン系繊維の製造に際しては、製糸性及び繊維強度確保の点から、芯成分の構成成分のポリアミド樹脂として、メルティングフローレート(JIS K7210に準拠し、230℃で測定。以下、MFR値と略記)が10〜40g/10分、より好ましくは20〜40g/10分の範囲の樹脂を、また鞘成分の構成成分のポリプロピレン樹脂として、MFR値が8〜50g/10分、より好ましくは9〜30g/10分の範囲の樹脂を、さらに、芯成分及び鞘成分の構成成分の無水マレイン酸変性ポリプロピレン樹脂として、MFR値が10〜40g/10分、より好ましくは20〜40g/10分の範囲の樹脂を、それぞれ用いることが好ましい。   In the production of polypropylene fibers, from the standpoint of securing the yarn-making property and fiber strength, a melting flow rate (measured in accordance with JIS K7210 at 230 ° C. as a polyamide resin as a core component) is hereinafter abbreviated as MFR value. ) Is in the range of 10-40 g / 10 min, more preferably 20-40 g / 10 min, and as a polypropylene resin as a constituent component of the sheath component, the MFR value is 8-50 g / 10 min, more preferably 9- The resin in the range of 30 g / 10 min is further used as a maleic anhydride-modified polypropylene resin as a constituent component of the core component and the sheath component, and the MFR value is in the range of 10-40 g / 10 min, more preferably in the range of 20-40 g / 10 min. These resins are preferably used.

溶融紡糸においては、紡糸に先立ち、例えば、芯成分であれば、ポリアミド樹脂と無水マレイン酸変性ポリプロピレン樹脂をそれぞれのチップの状態でブレンドしておいてもよいし、ポリアミド樹脂と無水マレイン酸変性ポリプロピレン樹脂の混合物をバンバリーミキサー、2軸押出機等で混練した後賦型してペレットにしておいてもよく、また、鞘成分であれば、ポリプロピレン樹脂と無水マレイン酸変性ポリプロピレン樹脂を、芯成分におけると同様に、チップの状態でブレンドしておいてもよいし、混合物を混練してペレットにしておいてもよい。また、各種添加剤は、その機能にもよるが、芯鞘成分の樹脂に予め添加してもよいし、前記のようなチップの状態でのブレンド時或いはペレットにする際の混練時に添加してもよい。   In melt spinning, for example, if it is a core component, polyamide resin and maleic anhydride-modified polypropylene resin may be blended in the state of each chip, or polyamide resin and maleic anhydride-modified polypropylene, before spinning. The resin mixture may be kneaded with a Banbury mixer, a twin screw extruder, etc., and then shaped into pellets. If the sheath component, the polypropylene resin and maleic anhydride modified polypropylene resin Similarly to the above, it may be blended in the form of chips, or the mixture may be kneaded into pellets. Depending on the function, various additives may be added in advance to the resin of the core-sheath component, or may be added at the time of blending in the above chip state or at the time of kneading when making into pellets. Also good.

溶融紡糸は、溶融押出機により溶融した芯成分及び鞘成分を、好ましくは芯鞘比1:1〜1:2で、芯鞘複合紡糸ノズルから押し出し、紡出糸に紡糸油剤を付与し、未延伸糸として巻き取る。未延伸糸には、その後延伸、捲縮加工を施してフィラメント状のポリプロピレン系繊維を得る。また、未延伸糸を、紡糸油剤付与後に一旦巻き取ることなく、連続して延伸、捲縮加工を施してもよい。   In melt spinning, a core component and a sheath component melted by a melt extruder are preferably extruded from a core-sheath composite spinning nozzle at a core-sheath ratio of 1: 1 to 1: 2, and a spinning oil is applied to the spun yarn. Wind up as drawn yarn. The undrawn yarn is then drawn and crimped to obtain filamentary polypropylene fibers. Further, the undrawn yarn may be continuously drawn and crimped without being wound once after applying the spinning oil.

延伸工程は、熱源が接触型であっても或いは非接触型であってもよく、また延伸を1段或いは2段以上の多段で行ってもよい。延伸倍率は、1.7〜7倍とすることが好ましく、延伸倍率が1.7倍未満では、得られる繊維の繊維強度が低くなり、7倍を超えると、糸切れ等発生の危険性が高くなる。延伸温度は、50〜130℃であることが好ましく、延伸温度が50℃未満では、延伸倍率が低くなり、得られる繊維の繊維強度が低くなると共に延伸斑が発生し、130℃を超えると、糸切れが発生する等製糸安定性が悪くなる。また、捲縮加工もホットエアージェットを用いる方式、ギアを用いる方式等の賦型方式の通常ポリプロピレン繊維に適用される捲縮加工が採用され、特に制限されるものではない。   In the stretching step, the heat source may be a contact type or a non-contact type, and the stretching may be performed in one stage or multiple stages including two or more stages. The draw ratio is preferably 1.7 to 7 times. If the draw ratio is less than 1.7 times, the fiber strength of the obtained fiber is low, and if it exceeds 7 times, there is a risk of occurrence of thread breakage or the like. Get higher. The stretching temperature is preferably 50 to 130 ° C. When the stretching temperature is less than 50 ° C, the draw ratio is low, the fiber strength of the resulting fiber is low, and stretch spots are generated. The yarn-stabilizing stability such as thread breakage is deteriorated. The crimping process is not particularly limited, and a crimping process usually applied to polypropylene fibers of a shaping system such as a system using a hot air jet or a system using a gear is adopted.

本発明のポリプロピレン系繊維には、捲縮加工後に、さらにエアー交絡処理及び合撚又は追撚を施してもよい。これらの工程では、延伸糸を一旦巻き取った後に捲縮加工、エアー交絡処理及び合撚又は追撚を施してもよいし、延伸工程から連続して捲縮加工、エアー交絡処理及び合撚又は追撚を施してもよい。   The polypropylene fiber of the present invention may be further subjected to an air entanglement treatment and a twisting or additional twisting after crimping. In these steps, the drawn yarn may be wound once and then subjected to crimping, air entanglement treatment and intertwisting or additional twisting. Additional twist may be applied.

本発明の繊維製品は、前記の本発明のポリプロピレン系繊維を繊維製品の主たる構造部に或いは主たる構成素材として含んでなるものであり、本発明のポリプロピレン系繊維の発揮する特性を損なわない範囲であれば、本発明のポリプロピレン系繊維以外の他の繊維が含まれていてもよい。本発明においては、特に繊維製品は、カーペット、即ちカーペットのパイル及び又は基布、特にパイルに前記のポリプロピレン系繊維が主体として含まれるカーペットであることが好ましい。カーペットとしては、ループパイルカーペット、カットパイルカーペット、一部にパイル高の異なるカットパイル部が混在したカットパイルカーペット、或いはカットパイルの一部にループパイル部が混在したカットアンドループパイルカーペットであってもよい。   The fiber product of the present invention comprises the above-described polypropylene fiber of the present invention in the main structural portion of the fiber product or as a main constituent material, and within a range that does not impair the characteristics exhibited by the polypropylene fiber of the present invention. If present, other fibers other than the polypropylene fiber of the present invention may be contained. In the present invention, the textile product is particularly preferably a carpet, that is, a carpet pile and / or a base fabric, particularly a carpet in which the polypropylene fiber is mainly contained in the pile. The carpet is a loop pile carpet, a cut pile carpet, a cut pile carpet in which cut pile portions having different pile heights are mixed, or a cut and loop pile carpet in which a loop pile portion is mixed in a part of the cut pile. Also good.

カーペットは、タフト工程を経てパイルを形成した後、接着剤をカーペット基布の裏面に塗布し、乾燥して接着剤を硬化してパイルを固定することにより得ることができる。このカーペットの製造に際しては、接着剤を介して基布の裏面に、その用途に応じて、例えば合成ゴム又は塩化ビニル樹脂シートや麻布等を貼り付けてもよい。用いる接着剤には、その用途や裏地の材質或いは基布の種類に合わせ適宜選択することができ、例えばアクリル系ラテックス、ウレタン系接着剤等が用いられる。   The carpet can be obtained by forming a pile through a tufting process, applying an adhesive to the back surface of the carpet base fabric, drying and curing the adhesive to fix the pile. In manufacturing the carpet, synthetic rubber, a vinyl chloride resin sheet, linen, or the like may be attached to the back surface of the base fabric through an adhesive depending on the application. The adhesive to be used can be appropriately selected according to the use, the material of the backing or the kind of the base fabric, and for example, acrylic latex, urethane adhesive, etc. are used.

以下、本発明を実施例により具体的に説明する。なお、本発明における物性の測定及び評価は下記の方法に拠った。   Hereinafter, the present invention will be specifically described by way of examples. In addition, the measurement and evaluation of the physical property in this invention were based on the following method.

(繊維強伸度)
JIS L1013標準時試験に準拠し、オリエンテック社製、テンシロンRTC−1210Aにて繊維の引張り強度及び伸度を測定した。
(捲縮率)
試料を束ねて巻き取りカセ状のサンプル糸を作成し、サンプル糸を70℃で10分間乾熱処理し、熱処理後10分間放置する。次いで、サンプル糸の一端に測定荷重A((dtex×1/11)g×(2×巻き回数))を掛け1分後に糸長(L1)を測定する。次いで、測定荷重Aを除き2分間放置した後、サンプル糸の一端に測定荷重B((dtex×1/1100)g×(2×巻き回数))を掛け1分後に糸長(L2)を測定する。L1及びL2より下式により捲縮率を算出する。なお、2×巻き回数とは2回巻きのカセでは繊維4本分の応力を測定しているので、1本当たりの数値を出すため4で割りかえしている。
捲縮率(%)=((L1−L2)/L1)×100
(Fiber elongation)
Based on the JIS L1013 standard time test, the tensile strength and elongation of the fiber were measured using Tensilon RTC-1210A manufactured by Orientec Corporation.
(Crimp rate)
Samples are bundled to form a rolled-up sample yarn, and the sample yarn is subjected to a dry heat treatment at 70 ° C. for 10 minutes, and is left for 10 minutes after the heat treatment. Next, a measurement load A ((dtex × 1/11) g × (2 × number of windings)) is applied to one end of the sample yarn, and the yarn length (L1) is measured after 1 minute. Next, after removing the measurement load A and allowing it to stand for 2 minutes, the measurement load B ((dtex × 1/1100) g × (2 × number of windings)) is applied to one end of the sample yarn, and the yarn length (L2) is measured after 1 minute. To do. The crimp rate is calculated from L1 and L2 by the following equation. Note that the 2 × number of windings means that the stress for four fibers is measured in the case of a two-winding cassette, and is divided by 4 to obtain a numerical value per one.
Crimp rate (%) = ((L1−L2) / L1) × 100

(芯鞘界面の剥離)
試料を中央にして染色した綿で包み、ステンレススチール板に設けた直径0.5mmの孔に通し、ステンレススチール板の上部及び下部をそれぞれ板面に沿って切断して繊維断面サンプルを作成する。このサンプルを、光学顕微鏡(ニコン社製、ECLIPSE 80i)にて倍率400倍下で、繊維断面での芯部と鞘部との界面における剥離の有無を観察した。
(Peeling of the core-sheath interface)
The sample is wrapped with dyed cotton at the center, passed through a hole with a diameter of 0.5 mm provided in the stainless steel plate, and the upper and lower portions of the stainless steel plate are cut along the plate surface to prepare a fiber cross-section sample. This sample was observed with an optical microscope (Nikon Corporation, ECLIPSE 80i) under the magnification of 400 times for the presence or absence of peeling at the interface between the core and sheath in the fiber cross section.

(170℃乾熱処理後の伸長率)
試料を束ねて巻き取りカセ状のサンプル糸を作成し、サンプル糸の一端に測定荷重((dtex×1/11)g×(2×巻き回数))を掛け1分後に糸長(L1)を測定する。次いで、サンプル糸を170℃で5分間乾熱処理した後、室温で15分間放置し冷却した後、サンプル糸の一端に前記と同じ測定荷重を掛け1分後に糸長(L2)を測定する。L1及びL2より下式により伸長率を算出する。
伸長率(%)=((L1−L2)/L1)×100
この乾熱処理後の伸長率は、より詳しくは乾熱処理後の前記荷重時の伸長率であり、170℃乾熱処理後の伸長率が低い程、捲縮形態の変化が少なく、クリープ特性が良好なることを示す。
(Elongation rate after 170 ° C dry heat treatment)
Samples are bundled to create a winding crumpled sample yarn, one end of the sample yarn is multiplied by the measurement load ((dtex × 1/11) g × (2 × number of windings)), and the yarn length (L1) is set after 1 minute. taking measurement. Next, the sample yarn is subjected to a dry heat treatment at 170 ° C. for 5 minutes, and then allowed to stand at room temperature for 15 minutes and cooled. The elongation rate is calculated from L1 and L2 by the following equation.
Elongation rate (%) = ((L1−L2) / L1) × 100
More specifically, the elongation rate after the dry heat treatment is the elongation rate at the time of the load after the dry heat treatment. The lower the elongation rate after the 170 ° C. dry heat treatment, the less the change in the crimped form and the better the creep characteristics. It shows that.

(実施例1)
芯成分としてナイロン6樹脂(三菱エンジニアリングプラスチック社製、ノバミット1010J、融点224℃)と無水マレイン酸変性ポリプロピレン樹脂(三菱化学社製、モディックAPMRENYP−1、融点163℃、以下、変性PP樹脂と略記)を用い、鞘成分としてポリプロピレン樹脂(日本ポリプロ社製、SA03、MFR31/10分、融点165℃、以下、PP樹脂と略記)と変性PP樹脂を用い、表1に示す組成とした。鞘成分にはグレー色顔料(大日精化工業社製、4Y97)を鞘成分に対し1質量%添加し、芯成分と鞘成分をそれぞれ芯鞘複合紡糸機の一軸押出機に投入し、表1に示す芯鞘比(体積比)として、押出温度255℃、紡糸ノズル温度250℃にて、孔形状三角、孔数120の紡糸ノズルより吐出量288g/分で吐出し、紡糸速度715m/分で溶融紡糸した。引き続き、未延伸糸を、巻き取ることなく、延伸温度110℃、延伸倍率2.4倍の延伸と熱セット温度125℃、熱風温度185℃のホットエアー捲縮加工の同時延伸ホットエアー捲縮加工を行い、緩和率19.2%で巻き取り、2000dtex/120フィラメント(f)のポリプロピレン系繊維を得た。
Example 1
Nylon 6 resin (manufactured by Mitsubishi Engineering Plastics, Novamit 1010J, melting point 224 ° C.) and maleic anhydride-modified polypropylene resin (manufactured by Mitsubishi Chemical Corporation, Modic APMRENYP-1, melting point 163 ° C., hereinafter abbreviated as modified PP resin) as core components The composition shown in Table 1 was obtained using polypropylene resin (SA03, MFR 31/10 min, melting point 165 ° C., hereinafter abbreviated as PP resin) and modified PP resin as sheath components. For the sheath component, 1% by mass of a gray pigment (manufactured by Dainichi Seika Kogyo Co., Ltd., 4Y97) is added to the sheath component, and the core component and the sheath component are respectively charged into a single-screw extruder of the core-sheath compound spinning machine. The core-sheath ratio (volume ratio) shown in Fig. 1 was discharged at a discharge rate of 288 g / min from a spinning nozzle with a hole-shaped triangle and 120 holes at an extrusion temperature of 255 ° C and a spinning nozzle temperature of 250 ° C, and at a spinning speed of 715 m / min. Melt spun. Subsequently, without drawing the undrawn yarn, simultaneous drawing hot air crimping of drawing at a drawing temperature of 110 ° C., drawing at a draw ratio of 2.4 times, hot setting temperature of 125 ° C. and hot air temperature of 185 ° C. And wound up at a relaxation rate of 19.2% to obtain 2000 dtex / 120 filament (f) polypropylene fiber.

得られたポリプロピレン系繊維の捲縮率等の物性値を表1に示した。次いで、得られたポリプロピレン系繊維を用い、1/8ゲージのタフティングマシンにて、パイル打ち込み密度12本/インチ、パイル高さ8mmでタフトし、ループパイルカーペットを作成した。ポリプロピレン系繊維を得るに当たっての製糸安定性、得られたポリプロピレン系繊維における芯鞘界面の剥離、ループパイルカーペットの作成の際のタフト工程の通過性及び170℃乾熱処理後の伸長率の評価結果を表1に示した。   Table 1 shows the physical properties such as crimp ratio of the obtained polypropylene fiber. Next, using the obtained polypropylene fiber, tufting was performed at a pile driving density of 12 / inch and a pile height of 8 mm using a 1/8 gauge tufting machine to prepare a loop pile carpet. The evaluation results of the spinning stability in obtaining polypropylene fibers, the peeling of the core-sheath interface in the obtained polypropylene fibers, the passability of the tufting process when creating a loop pile carpet, and the elongation rate after 170 ° C. dry heat treatment It is shown in Table 1.

(実施例2)
実施例1において、芯成分のナイロン6樹脂と変性PP樹脂との組成比、及び鞘成分のPP樹脂と変性PP樹脂との組成比を表1に示すように代え、顔料をアイボリー色顔料(大日精化工業社製、P7190)に代えた以外は、実施例1と同様にして2000dtex/120fのポリプロピレン系繊維を得た。得られたポリプロピレン系繊維の捲縮率等の物性値を表1に示した。また、得られたポリプロピレン系繊維を用い、実施例1と同様にしてループパイルカーペットを作成した。ポリプロピレン系繊維を得るに当たっての製糸安定性、得られたポリプロピレン系繊維における芯鞘界面の剥離、ループパイルカーペットの作成の際のタフト工程の通過性及び170℃乾熱処理後の伸長率の評価結果を表1に示した。
(Example 2)
In Example 1, the composition ratio of the core component nylon 6 resin and the modified PP resin and the sheath component PP resin and the modified PP resin were changed as shown in Table 1, and the pigment was replaced with an ivory color pigment (large A 2000 dtex / 120f polypropylene fiber was obtained in the same manner as in Example 1 except that it was replaced with Nissei Kagaku Kogyo Co., Ltd., P7190). Table 1 shows the physical properties such as crimp ratio of the obtained polypropylene fiber. A loop pile carpet was produced in the same manner as in Example 1 using the obtained polypropylene fiber. The evaluation results of the spinning stability in obtaining polypropylene fibers, the peeling of the core-sheath interface in the obtained polypropylene fibers, the passability of the tufting process when creating a loop pile carpet, and the elongation rate after 170 ° C. dry heat treatment It is shown in Table 1.

(実施例3)
実施例1において、芯成分のナイロン6樹脂と変性PP樹脂との組成比を表1に示すように代えた以外は、実施例1と同様にして2000dtex/120fのポリプロピレン系繊維を得た。得られたポリプロピレン系繊維の捲縮率等の物性値を表1に示した。また、得られたポリプロピレン系繊維を用い、実施例1と同様にしてループパイルカーペットを作成した。ポリプロピレン系繊維を得るに当たっての製糸安定性、得られたポリプロピレン系繊維における芯鞘界面の剥離、ループパイルカーペットの作成の際のタフト工程の通過性及び170℃乾熱処理後の伸長率の評価結果を表1に示した。
(Example 3)
In Example 1, a 2000-dtex / 120f polypropylene fiber was obtained in the same manner as in Example 1 except that the composition ratio of the core component nylon 6 resin and the modified PP resin was changed as shown in Table 1. Table 1 shows the physical properties such as crimp ratio of the obtained polypropylene fiber. A loop pile carpet was produced in the same manner as in Example 1 using the obtained polypropylene fiber. The evaluation results of the spinning stability in obtaining polypropylene fibers, the peeling of the core-sheath interface in the obtained polypropylene fibers, the passability of the tufting process when creating a loop pile carpet, and the elongation rate after 170 ° C. dry heat treatment It is shown in Table 1.

(実施例4)
実施例1において、芯鞘比を表1に示すように代えた以外は、実施例1と同様にして2000dtex/120fのポリプロピレン系繊維を得た。得られたポリプロピレン系繊維の捲縮率等の物性値を表1に示した。また、得られたポリプロピレン系繊維を用い、実施例1と同様にしてループパイルカーペットを作成した。ポリプロピレン系繊維を得るに当たっての製糸安定性、得られたポリプロピレン系繊維における芯鞘界面の剥離、ループパイルカーペットの作成の際のタフト工程の通過性及び170℃乾熱処理後の伸長率の評価結果を表1に示した。
Example 4
In Example 1, 2000 dtex / 120f polypropylene fiber was obtained in the same manner as in Example 1 except that the core-sheath ratio was changed as shown in Table 1. Table 1 shows the physical properties such as crimp ratio of the obtained polypropylene fiber. A loop pile carpet was produced in the same manner as in Example 1 using the obtained polypropylene fiber. The evaluation results of the spinning stability in obtaining polypropylene fibers, the peeling of the core-sheath interface in the obtained polypropylene fibers, the passability of the tufting process when creating a loop pile carpet, and the elongation rate after 170 ° C. dry heat treatment It is shown in Table 1.

(比較例1)
芯成分としてナイロン6樹脂のみを用い、鞘成分としてPP樹脂のみを用い、鞘成分にはグレー色顔料(大日精化工業社製、4Y97)を1質量%添加し、芯成分と鞘成分をそれぞれ芯鞘複合紡糸機の一軸押出機に投入し、芯鞘比(体積比)を1:1として、押出温度255℃、紡糸ノズル温度250℃にて、孔形状三角、孔数120の紡糸ノズルより吐出量288g/分で吐出し、紡糸速度715m/分で溶融紡糸した。引き続き、未延伸糸を、巻き取ることなく、延伸温度110℃、延伸倍率2.4倍の延伸と熱セット温度125℃、熱風温度185℃のホットエアー捲縮加工の同時延伸ホットエアー捲縮加工を行い、緩和率19.2%で巻き取り、2000dtex/120fのポリプロピレン系繊維を得た。得られたポリプロピレン系繊維の捲縮率等の物性値を表1に示した。次いで、得られたポリプロピレン系繊維を用い、実施例1と同様にしてループパイルカーペットを作成した。ポリプロピレン系繊維を得るに当たっての製糸安定性、得られたポリプロピレン系繊維における芯鞘界面の剥離、ループパイルカーペットの作成の際のタフト工程の通過性及び170℃乾熱処理後の伸長率の評価結果を表1に示したが、製糸の延伸工程でPP樹脂と思われる樹脂が延伸ローラーに付着し、得られた繊維の芯鞘界面に空隙があり剥離が確認され、タフト工程で糸道調整ガイド、針、ルーパーに樹脂、短繊維が付着していた。
(Comparative Example 1)
Using only nylon 6 resin as the core component, using only PP resin as the sheath component, adding 1% by mass of gray pigment (4Y97, manufactured by Dainichi Seika Kogyo Co., Ltd.) to the sheath component, the core component and the sheath component are respectively added. A core-sheath compound spinning machine is put into a single-screw extruder, the core-sheath ratio (volume ratio) is 1: 1, and the extrusion temperature is 255 ° C and the spinning nozzle temperature is 250 ° C. Discharge was performed at a discharge rate of 288 g / min, and melt spinning was performed at a spinning speed of 715 m / min. Subsequently, without drawing the undrawn yarn, simultaneous drawing hot air crimping of drawing at a drawing temperature of 110 ° C., drawing at a draw ratio of 2.4 times, hot setting temperature of 125 ° C. and hot air temperature of 185 ° C. And wound up at a relaxation rate of 19.2% to obtain 2000 dtex / 120f polypropylene fiber. Table 1 shows the physical properties such as crimp ratio of the obtained polypropylene fiber. Next, a loop pile carpet was produced in the same manner as in Example 1 using the obtained polypropylene fiber. The evaluation results of the spinning stability in obtaining polypropylene fibers, the peeling of the core-sheath interface in the obtained polypropylene fibers, the passability of the tufting process when creating a loop pile carpet, and the elongation rate after 170 ° C. dry heat treatment As shown in Table 1, a resin that seems to be a PP resin adheres to the drawing roller in the drawing process of yarn production, and there is a gap at the core-sheath interface of the obtained fiber, and peeling is confirmed in the tufting process. Resin and short fibers were attached to the needle and looper.

(比較例2)
実施例4において、鞘成分をPP樹脂のみに代えた以外は、実施例4と同様にして2000dtex/120fのポリプロピレン系繊維を得た。得られたポリプロピレン系繊維の捲縮率等の物性値を表1に示した。また、得られたポリプロピレン系繊維を用い、実施例1と同様にしてループパイルカーペットを作成した。ポリプロピレン系繊維を得るに当たっての製糸安定性、得られたポリプロピレン系繊維における芯鞘界面の剥離、ループパイルカーペットの作成の際のタフト工程の通過性及び170℃乾熱処理後の伸長率の評価結果を表1に示したが、製糸の延伸工程でPP樹脂と思われる樹脂が延伸ローラーに付着し、得られた繊維の芯鞘界面に空隙があり剥離が確認され、タフト工程で糸道調整ガイド、針、ルーパーに樹脂、短繊維が付着していた。
(Comparative Example 2)
In Example 4, a polypropylene fiber of 2000 dtex / 120f was obtained in the same manner as in Example 4 except that the sheath component was changed to only PP resin. Table 1 shows the physical properties such as crimp ratio of the obtained polypropylene fiber. A loop pile carpet was produced in the same manner as in Example 1 using the obtained polypropylene fiber. The evaluation results of the spinning stability in obtaining polypropylene fibers, the peeling of the core-sheath interface in the obtained polypropylene fibers, the passability of the tufting process when creating a loop pile carpet, and the elongation rate after 170 ° C. dry heat treatment As shown in Table 1, a resin that seems to be a PP resin adheres to the drawing roller in the drawing process of yarn production, and there is a gap at the core-sheath interface of the obtained fiber, and peeling is confirmed in the tufting process. Resin and short fibers were attached to the needle and looper.

(比較例3)
比較例2において、芯鞘比を表1に示すように代えた以外は、比較例2と同様にして2000dtex/120fのポリプロピレン系繊維を得た。得られたポリプロピレン系繊維の捲縮率等の物性値を表1に示した。また、得られたポリプロピレン系繊維を用い、実施例1と同様にしてループパイルカーペットを作成した。ポリプロピレン系繊維を得るに当たっての製糸安定性、得られたポリプロピレン系繊維における芯鞘界面の剥離、ループパイルカーペットの作成の際のタフト工程の通過性及び170℃乾熱処理後の伸長率の評価結果を表1に示したが、製糸の延伸工程でPP樹脂と思われる樹脂が延伸ローラーに付着し、得られた繊維の芯鞘界面に空隙があり剥離が確認され、ループパイルカーペットはその長手方向に白部が見られ品位の低いものであった。
(Comparative Example 3)
In Comparative Example 2, a 2000-dtex / 120f polypropylene fiber was obtained in the same manner as in Comparative Example 2, except that the core-sheath ratio was changed as shown in Table 1. Table 1 shows the physical properties such as crimp ratio of the obtained polypropylene fiber. A loop pile carpet was produced in the same manner as in Example 1 using the obtained polypropylene fiber. The evaluation results of the spinning stability in obtaining polypropylene fibers, the peeling of the core-sheath interface in the obtained polypropylene fibers, the passability of the tufting process when creating a loop pile carpet, and the elongation rate after 170 ° C. dry heat treatment As shown in Table 1, resin that seems to be PP resin adheres to the drawing roller in the drawing process of the yarn production, there is a gap at the core-sheath interface of the obtained fiber, peeling is confirmed, and the loop pile carpet is in its longitudinal direction. The white part was seen and the quality was low.

(比較例4)
PP樹脂を、押出温度215℃、紡糸ノズル温度210℃にて、孔形状三角、孔数120の通常の紡糸ノズルより吐出した以外は、実施例1と同様にして2000dtex/120fのポリプロピレン系繊維を得た。得られたポリプロピレン系繊維の捲縮率等の物性値を表1に示した。また、得られたポリプロピレン系繊維を用い、実施例1と同様にしてループパイルカーペットを作成した。ポリプロピレン系繊維を得るに当たっての製糸安定性、得られたポリプロピレン系繊維における芯鞘界面の剥離、ループパイルカーペットの作成の際のタフト工程の通過性及び170℃乾熱処理後の伸長率の評価結果を表1に示したが、乾熱処理後の伸長率が大きくなって捲縮形態が変形し、カーペットにおける成型性に問題があった。
(Comparative Example 4)
Except that the PP resin was discharged from a normal spinning nozzle having a hole-shaped triangle and a hole number of 120 at an extrusion temperature of 215 ° C. and a spinning nozzle temperature of 210 ° C., a polypropylene-based fiber of 2000 dtex / 120 f was obtained in the same manner as in Example 1. Obtained. Table 1 shows the physical properties such as crimp ratio of the obtained polypropylene fiber. A loop pile carpet was produced in the same manner as in Example 1 using the obtained polypropylene fiber. The evaluation results of the spinning stability in obtaining polypropylene fibers, the peeling of the core-sheath interface in the obtained polypropylene fibers, the passability of the tufting process when creating a loop pile carpet, and the elongation rate after 170 ° C. dry heat treatment As shown in Table 1, there was a problem in the moldability of the carpet because the elongation after the dry heat treatment was increased and the crimped shape was deformed.

本発明のポリプロピレン系繊維は、従来からのポリプロピレン系繊維では達成困難であった耐熱性が要求される繊維製品、特に熱賦型の成型加工が必要となるカーペットの製造に極めて有用なるものであり、繊維製品、特にカーペット、とりわけ車両用のラインマット、オプションマット、ラグ・ピースカーペット等に好適に用いられる。また、本発明の繊維製品は、耐熱性に加え、軽量性、嵩高性に優れ、ソフトな風合いを有することから、カーペットのみならず、他の用途の製品であってもよい。
The polypropylene fiber of the present invention is extremely useful for the production of fiber products that require heat resistance, which is difficult to achieve with conventional polypropylene fibers, especially carpets that require heat-molding molding. It is preferably used for textile products, particularly carpets, especially line mats for vehicles, option mats, rug piece carpets and the like. In addition to heat resistance, the fiber product of the present invention is excellent in lightness and bulkiness and has a soft texture, so it may be a product for other uses as well as carpets.

Claims (4)

芯成分がポリアミド樹脂と無水マレイン酸変性ポリプロピレン樹脂との混合物からなり、鞘成分がポリプロピレン樹脂と無水マレイン酸変性ポリプロピレン樹脂との混合物からなる芯鞘複合構造を有し、170℃の乾熱雰囲気下で乾熱処理した後の(繊度(dtex)×1/11g)荷重時の伸長率が10%以下であるポリプロピレン系繊維。   The core component consists of a mixture of polyamide resin and maleic anhydride modified polypropylene resin, and the sheath component has a core / sheath composite structure consisting of a mixture of polypropylene resin and maleic anhydride modified polypropylene resin, under a dry heat atmosphere of 170 ° C. Polypropylene fibers having an elongation rate of 10% or less after being subjected to dry heat treatment (fineness (dtex) × 1/11 g) under load. 芯成分がポリアミド樹脂60〜90質量%と無水マレイン酸変性ポリプロピレン樹脂40〜10質量%の混合物、鞘成分がポリプロピレン樹脂60〜90質量%と無水マレイン酸変性ポリプロピレン樹脂40〜10質量%の混合物である請求項1に記載のポリプロピレン系繊維。   The core component is a mixture of polyamide resin 60 to 90% by mass and maleic anhydride modified polypropylene resin 40 to 10% by mass, and the sheath component is a mixture of polypropylene resin 60 to 90% by mass and maleic anhydride modified polypropylene resin 40 to 10% by mass. The polypropylene fiber according to claim 1. 捲縮率が5〜20%である請求項1又は2に記載のポリプロピレン系繊維。   The polypropylene fiber according to claim 1 or 2, wherein the crimp rate is 5 to 20%. 請求項1〜3のいずれか一項に記載のポリプロピレン系繊維を含む繊維製品。   The textiles containing the polypropylene fiber as described in any one of Claims 1-3.
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