JP4310170B2 - Thermal adhesive composite fiber for airlaid nonwoven fabric - Google Patents
Thermal adhesive composite fiber for airlaid nonwoven fabric Download PDFInfo
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- JP4310170B2 JP4310170B2 JP2003375777A JP2003375777A JP4310170B2 JP 4310170 B2 JP4310170 B2 JP 4310170B2 JP 2003375777 A JP2003375777 A JP 2003375777A JP 2003375777 A JP2003375777 A JP 2003375777A JP 4310170 B2 JP4310170 B2 JP 4310170B2
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- 239000000835 fiber Substances 0.000 title claims description 93
- 239000000853 adhesive Substances 0.000 title claims description 71
- 239000004745 nonwoven fabric Substances 0.000 title claims description 51
- 239000002131 composite material Substances 0.000 title claims description 28
- 230000001070 adhesive effect Effects 0.000 title claims description 13
- -1 polypropylene Polymers 0.000 claims description 63
- 229920000642 polymer Polymers 0.000 claims description 50
- 229920000139 polyethylene terephthalate Polymers 0.000 claims description 32
- 239000005020 polyethylene terephthalate Substances 0.000 claims description 31
- 238000002844 melting Methods 0.000 claims description 25
- 230000008018 melting Effects 0.000 claims description 25
- QQVIHTHCMHWDBS-UHFFFAOYSA-N isophthalic acid Chemical compound OC(=O)C1=CC=CC(C(O)=O)=C1 QQVIHTHCMHWDBS-UHFFFAOYSA-N 0.000 claims description 18
- OFOBLEOULBTSOW-UHFFFAOYSA-N Propanedioic acid Natural products OC(=O)CC(O)=O OFOBLEOULBTSOW-UHFFFAOYSA-N 0.000 claims description 17
- 230000007547 defect Effects 0.000 claims description 14
- 229920000098 polyolefin Polymers 0.000 claims description 12
- 229920001707 polybutylene terephthalate Polymers 0.000 claims description 11
- 239000003795 chemical substances by application Substances 0.000 claims description 9
- 229920000728 polyester Polymers 0.000 claims description 9
- 229920001283 Polyalkylene terephthalate Polymers 0.000 claims description 8
- VZCYOOQTPOCHFL-UPHRSURJSA-N maleic acid Chemical compound OC(=O)\C=C/C(O)=O VZCYOOQTPOCHFL-UPHRSURJSA-N 0.000 claims description 8
- 239000011976 maleic acid Substances 0.000 claims description 8
- 229920000747 poly(lactic acid) Polymers 0.000 claims description 8
- VZCYOOQTPOCHFL-UHFFFAOYSA-N trans-butenedioic acid Natural products OC(=O)C=CC(O)=O VZCYOOQTPOCHFL-UHFFFAOYSA-N 0.000 claims description 8
- JVTAAEKCZFNVCJ-REOHCLBHSA-N L-lactic acid Chemical compound C[C@H](O)C(O)=O JVTAAEKCZFNVCJ-REOHCLBHSA-N 0.000 claims description 6
- 239000004743 Polypropylene Substances 0.000 claims description 6
- PPBRXRYQALVLMV-UHFFFAOYSA-N Styrene Chemical compound C=CC1=CC=CC=C1 PPBRXRYQALVLMV-UHFFFAOYSA-N 0.000 claims description 6
- 239000002253 acid Substances 0.000 claims description 6
- 229920001684 low density polyethylene Polymers 0.000 claims description 6
- 239000004702 low-density polyethylene Substances 0.000 claims description 6
- 229920001155 polypropylene Polymers 0.000 claims description 6
- 229920001296 polysiloxane Polymers 0.000 claims description 6
- 125000004432 carbon atom Chemical group C* 0.000 claims description 4
- SMZOUWXMTYCWNB-UHFFFAOYSA-N 2-(2-methoxy-5-methylphenyl)ethanamine Chemical compound COC1=CC=C(C)C=C1CCN SMZOUWXMTYCWNB-UHFFFAOYSA-N 0.000 claims description 3
- NIXOWILDQLNWCW-UHFFFAOYSA-N 2-Propenoic acid Natural products OC(=O)C=C NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 claims description 3
- 229930182843 D-Lactic acid Natural products 0.000 claims description 3
- JVTAAEKCZFNVCJ-UWTATZPHSA-N D-lactic acid Chemical compound C[C@@H](O)C(O)=O JVTAAEKCZFNVCJ-UWTATZPHSA-N 0.000 claims description 3
- CERQOIWHTDAKMF-UHFFFAOYSA-N Methacrylic acid Chemical compound CC(=C)C(O)=O CERQOIWHTDAKMF-UHFFFAOYSA-N 0.000 claims description 3
- 229940022769 d- lactic acid Drugs 0.000 claims description 3
- 229920001903 high density polyethylene Polymers 0.000 claims description 3
- 239000004700 high-density polyethylene Substances 0.000 claims description 3
- 229920001179 medium density polyethylene Polymers 0.000 claims description 3
- 239000004701 medium-density polyethylene Substances 0.000 claims description 3
- 229910019142 PO4 Inorganic materials 0.000 claims description 2
- 229920003171 Poly (ethylene oxide) Polymers 0.000 claims description 2
- 229910052783 alkali metal Inorganic materials 0.000 claims description 2
- 150000005215 alkyl ethers Chemical class 0.000 claims description 2
- 239000004205 dimethyl polysiloxane Substances 0.000 claims description 2
- 239000010452 phosphate Substances 0.000 claims description 2
- 229920000435 poly(dimethylsiloxane) Polymers 0.000 claims description 2
- 229920001451 polypropylene glycol Polymers 0.000 claims description 2
- 230000015572 biosynthetic process Effects 0.000 claims 1
- 238000010559 graft polymerization reaction Methods 0.000 claims 1
- 239000000306 component Substances 0.000 description 64
- 238000000034 method Methods 0.000 description 17
- 229920001577 copolymer Polymers 0.000 description 16
- MTHSVFCYNBDYFN-UHFFFAOYSA-N diethylene glycol Chemical compound OCCOCCO MTHSVFCYNBDYFN-UHFFFAOYSA-N 0.000 description 12
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 10
- 150000002009 diols Chemical class 0.000 description 9
- 208000027418 Wounds and injury Diseases 0.000 description 7
- 239000002585 base Substances 0.000 description 7
- 238000001816 cooling Methods 0.000 description 7
- QQVIHTHCMHWDBS-UHFFFAOYSA-L isophthalate(2-) Chemical compound [O-]C(=O)C1=CC=CC(C([O-])=O)=C1 QQVIHTHCMHWDBS-UHFFFAOYSA-L 0.000 description 7
- 239000000203 mixture Substances 0.000 description 7
- 239000004626 polylactic acid Substances 0.000 description 7
- 239000008358 core component Substances 0.000 description 6
- BWIIMRFKCNBWEH-UHFFFAOYSA-L dipotassium;octadecyl phosphate Chemical compound [K+].[K+].CCCCCCCCCCCCCCCCCCOP([O-])([O-])=O BWIIMRFKCNBWEH-UHFFFAOYSA-L 0.000 description 6
- 238000000465 moulding Methods 0.000 description 6
- 239000006187 pill Substances 0.000 description 6
- 239000002202 Polyethylene glycol Substances 0.000 description 5
- 238000007334 copolymerization reaction Methods 0.000 description 5
- 239000000839 emulsion Substances 0.000 description 5
- 238000007373 indentation Methods 0.000 description 5
- 229920001223 polyethylene glycol Polymers 0.000 description 5
- 229920002215 polytrimethylene terephthalate Polymers 0.000 description 5
- 239000004721 Polyphenylene oxide Substances 0.000 description 4
- 230000007423 decrease Effects 0.000 description 4
- 125000000118 dimethyl group Chemical group [H]C([H])([H])* 0.000 description 4
- 150000002148 esters Chemical class 0.000 description 4
- 229920000570 polyether Polymers 0.000 description 4
- LYCAIKOWRPUZTN-UHFFFAOYSA-N Ethylene glycol Chemical compound OCCO LYCAIKOWRPUZTN-UHFFFAOYSA-N 0.000 description 3
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 description 3
- 241001122767 Theaceae Species 0.000 description 3
- 239000012298 atmosphere Substances 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
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- WNLRTRBMVRJNCN-UHFFFAOYSA-N adipic acid Chemical compound OC(=O)CCCCC(O)=O WNLRTRBMVRJNCN-UHFFFAOYSA-N 0.000 description 2
- WERYXYBDKMZEQL-UHFFFAOYSA-N butane-1,4-diol Chemical compound OCCCCO WERYXYBDKMZEQL-UHFFFAOYSA-N 0.000 description 2
- 238000010411 cooking Methods 0.000 description 2
- 238000002788 crimping Methods 0.000 description 2
- 230000004927 fusion Effects 0.000 description 2
- 229920000092 linear low density polyethylene Polymers 0.000 description 2
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- 238000002074 melt spinning Methods 0.000 description 2
- 238000002156 mixing Methods 0.000 description 2
- BDJRBEYXGGNYIS-UHFFFAOYSA-N nonanedioic acid Chemical compound OC(=O)CCCCCCCC(O)=O BDJRBEYXGGNYIS-UHFFFAOYSA-N 0.000 description 2
- 230000035699 permeability Effects 0.000 description 2
- YPFDHNVEDLHUCE-UHFFFAOYSA-N propane-1,3-diol Chemical compound OCCCO YPFDHNVEDLHUCE-UHFFFAOYSA-N 0.000 description 2
- QQONPFPTGQHPMA-UHFFFAOYSA-N propylene Natural products CC=C QQONPFPTGQHPMA-UHFFFAOYSA-N 0.000 description 2
- CXMXRPHRNRROMY-UHFFFAOYSA-N sebacic acid Chemical compound OC(=O)CCCCCCCCC(O)=O CXMXRPHRNRROMY-UHFFFAOYSA-N 0.000 description 2
- 239000002904 solvent Substances 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- ISPYQTSUDJAMAB-UHFFFAOYSA-N 2-chlorophenol Chemical compound OC1=CC=CC=C1Cl ISPYQTSUDJAMAB-UHFFFAOYSA-N 0.000 description 1
- 241000251468 Actinopterygii Species 0.000 description 1
- 206010004542 Bezoar Diseases 0.000 description 1
- 229920002292 Nylon 6 Polymers 0.000 description 1
- ORLQHILJRHBSAY-UHFFFAOYSA-N [1-(hydroxymethyl)cyclohexyl]methanol Chemical compound OCC1(CO)CCCCC1 ORLQHILJRHBSAY-UHFFFAOYSA-N 0.000 description 1
- 239000006096 absorbing agent Substances 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 239000001361 adipic acid Substances 0.000 description 1
- 235000011037 adipic acid Nutrition 0.000 description 1
- 239000002518 antifoaming agent Substances 0.000 description 1
- 239000003963 antioxidant agent Substances 0.000 description 1
- 239000003086 colorant Substances 0.000 description 1
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- 150000001875 compounds Chemical class 0.000 description 1
- 238000001938 differential scanning calorimetry curve Methods 0.000 description 1
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- 239000003063 flame retardant Substances 0.000 description 1
- 238000009998 heat setting Methods 0.000 description 1
- 239000012760 heat stabilizer Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 239000012510 hollow fiber Substances 0.000 description 1
- 238000007602 hot air drying Methods 0.000 description 1
- 230000001788 irregular Effects 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000006224 matting agent Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 229940127554 medical product Drugs 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 239000000049 pigment Substances 0.000 description 1
- 229920001610 polycaprolactone Polymers 0.000 description 1
- 239000004632 polycaprolactone Substances 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 125000004805 propylene group Chemical group [H]C([H])([H])C([H])([*:1])C([H])([H])[*:2] 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 238000012827 research and development Methods 0.000 description 1
- 238000000646 scanning calorimetry Methods 0.000 description 1
- YXTFRJVQOWZDPP-UHFFFAOYSA-M sodium;3,5-dicarboxybenzenesulfonate Chemical compound [Na+].OC(=O)C1=CC(C(O)=O)=CC(S([O-])(=O)=O)=C1 YXTFRJVQOWZDPP-UHFFFAOYSA-M 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
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Description
本発明は、エアレイド不織布用熱融着性複合繊維に関し、更に詳しくは、自動車用フィルターや天ぷら油濾しフィルターなどの耐熱性が要求されるエアレイド不織布を成形するのに適した熱接着性複合繊維に関するものである。 The present invention relates to a heat-fusible conjugate fiber for an air-laid nonwoven fabric, and more particularly to a heat-adhesive conjugate fiber suitable for molding an air-laid nonwoven fabric that requires heat resistance such as an automobile filter or a tempura oil filter. Is.
近年、生活用品、衛生材料、医療品など分野で、不織布が多く使用されている。また、最近では、高速で生産でき、嵩高性、通気性、通液性に優れた不織布が得られる、エアレイド不織布の研究・開発が進められており、中でも、取扱い性や力学特性などに優れたポリオレフィン系、ポリエステル系といった合成樹脂からなる短繊維を用いたエアレイド不織布が提案されている（例えば、特許文献１〜３など）。 In recent years, non-woven fabrics are often used in fields such as daily necessities, sanitary materials, and medical products. Recently, research and development of air-laid nonwoven fabrics that can produce nonwoven fabrics that can be produced at high speed and have excellent bulkiness, air permeability, and liquid permeability have been promoted. Airlaid nonwoven fabrics using short fibers made of synthetic resins such as polyolefins and polyesters have been proposed (for example, Patent Documents 1 to 3).
我々は、かかるエアレイド不織布の特徴を生かして、該不織布をエアフィルターやオイルフィルターといった自動車用フィルターや、天ぷら油濾しフィルターやあくとりシート、ティーバッグなどの食品抽出用フィルターといった耐熱性が要求される分野にも応用しようと試みた。 Taking advantage of the characteristics of such airlaid nonwoven fabric, we need heat resistance such as automotive filters such as air filters and oil filters, and food extraction filters such as tempura oil filter filters, cooking sheets and tea bags. I tried to apply it to the field.
ところが、従来提案されているエアレイド不織布は、高温で使用すると、耐熱性が不十分であるため不織布が大きく収縮して変形し、上記のような用途には適していないことがわかった。 However, it has been found that the conventionally proposed airlaid nonwoven fabric is not suitable for the above-described applications because it has insufficient heat resistance when it is used at a high temperature, causing the nonwoven fabric to shrink and deform greatly.
また、上記エアレイド不織布で提案されている短繊維を用いて、実際にエアレイド法で不織布を成形したとき、その成形条件によっては、不織布にクラック状の低密度斑が発生する問題があり、得られた不織布は特に均一性が要求されるフィルター用途には適さないものであった。通常、カード不織布では、これを構成する繊維の長さが長くかつ該繊維は捲縮を有していることから、繊維同士が絡合しやすくクラックが発生しない。これに対して、エアレイド不織布では、これを構成する繊維の長さが上記のカード不織布用繊維と比較して短いため、繊維が素抜けてクラックが生じやすいことがその原因であると考えられる。 In addition, when the nonwoven fabric is actually molded by the airlaid method using the short fibers proposed for the airlaid nonwoven fabric, there is a problem that cracked low density spots occur on the nonwoven fabric depending on the molding conditions. The non-woven fabric was not particularly suitable for filter applications requiring uniformity. Usually, in a card | curd nonwoven fabric, since the length of the fiber which comprises this is long and this fiber has a crimp, it is easy for a fiber to intertwine and a crack does not generate | occur | produce. On the other hand, in the air-laid nonwoven fabric, the length of the fibers constituting the air-laid nonwoven fabric is shorter than that of the card nonwoven fabric described above.
本発明は、上記従来技術を背景になされたもので、その目的は、高温雰囲気下においても優れた寸法安定性を示し、成形時においてもクラックが発生せず均一なエアレイド不織布を製造することができるエアレイド不織布用熱接着性複合繊維を提供することにある。 The present invention has been made against the background of the above-described prior art, and its purpose is to produce excellent air-laid nonwoven fabric that exhibits excellent dimensional stability even in a high-temperature atmosphere and that does not crack during molding. An object of the present invention is to provide a heat-adhesive conjugate fiber for airlaid nonwoven fabric.
本発明者は、鋭意検討を重ねた結果、繊維形成性成分と熱接着性成分とに適正な融点や軟化点を持つポリマーを選んで組み合わせ、さらに、乾熱収縮率を低くコントロールした複合繊維としたとき、これを繊維長が短いエアレイド用繊維としても、不織布の成形段階でクラックが発生せず、極めて高温での寸法安定性に優れた不織布が得られることを見出した。 As a result of intensive studies, the inventor selected and combined a polymer having an appropriate melting point and softening point with a fiber-forming component and a heat-adhesive component, and a composite fiber with a low dry heat shrinkage rate controlled. As a result, it was found that even when the fiber was made into an airlaid fiber having a short fiber length, cracks did not occur in the forming step of the nonwoven fabric, and a nonwoven fabric excellent in dimensional stability at an extremely high temperature was obtained.
かくして、本発明によれば、繊維形成性成分と熱接着性成分とからなり、繊維形成性成分を構成するポリマーがポリアルキレンテレフタレートであり繊維形成性成分を構成するポリマーの融点が２２０℃以上であり、熱接着性成分を構成するポリマーがポリエステル系ポリマーであって、熱接着性成分を主として構成するポリマーの融点が１３０〜２３０℃の範囲または軟化点が５０〜１５０℃の範囲で、かつ該融点または該軟化点が繊維形成性成分を構成するポリマーの融点より２０℃以上低く、熱接着性成分に、ポリオレフィン系ポリマーが該成分の重量を基準として０．５〜１５重量％混合分散されている熱接着性複合繊維であって、該ポリオレフィン系ポリマーがポリプロピレン、高密度ポリエチレン、中密度ポリエチレン、低密度ポリエチレン又は線状低密度ポリエチレンに、スチレン、アクリル酸、メタクリル酸又はマレイン酸を共重合したポリオレフィンであり、該熱接着性複合繊維の繊維長が２〜３０ｍｍの範囲、１２０℃乾熱収縮率が１５％以下であることを特徴とするエアレイド不織布用熱接着性複合繊維が提供される。 Thus, according to the present invention, the fiber-forming component and the heat-adhesive component are used, the polymer constituting the fiber-forming component is polyalkylene terephthalate, and the melting point of the polymer constituting the fiber-forming component is 220 ° C. or higher. The polymer constituting the heat-adhesive component is a polyester-based polymer, and the melting point of the polymer mainly constituting the heat-adhesive component is in the range of 130 to 230 ° C. or the softening point is in the range of 50 to 150 ° C., and The melting point or the softening point is 20 ° C. or more lower than the melting point of the polymer constituting the fiber-forming component, and the polyolefin polymer is mixed and dispersed in the heat-adhesive component by 0.5 to 15% by weight based on the weight of the component. a heat-adhesive composite fibers are, the polyolefin polymer is polypropylene, high density polyethylene, medium density polyethylene, low density The Riechiren or linear low density polyethylene, styrene, acrylic acid, a polyolefin obtained by copolymerizing methacrylic acid or maleic acid, the fiber length of the heat-adhesive composite fibers in the range of 2 to 30 mm, is 120 ° C. dry heat shrinkage A heat-adhesive conjugate fiber for an airlaid nonwoven fabric characterized by being 15% or less is provided.
本発明の熱接着性複合繊維からは、低密度斑、いわゆるクラックのない均一なエアレイド不織布を得ることができる。また、得られたエアレイド不織布は高温雰囲気下で使用しても変形せず、従来のエアレイド不織布では難しかった耐熱性が要求される用途に応用することができる。 From the heat-adhesive conjugate fiber of the present invention, a uniform air-laid nonwoven without low density spots, so-called cracks, can be obtained. Further, the obtained air laid nonwoven fabric does not deform even when used in a high temperature atmosphere, and can be applied to applications requiring heat resistance that has been difficult with conventional air laid nonwoven fabrics.
本発明の熱接着性複合繊維は、繊維形成性成分と熱接着性成分からなる熱接着性複合繊維ある。本発明において熱融着性複合繊維とは、繊維横断面において、繊維形性成分と熱接着性成分とを、並列型、芯鞘型、偏心芯鞘型、三層以上の多層型、中空並列型、中空芯鞘型、異形芯鞘型、海島型などに複合化した繊維であり、かつ熱接着性成分が繊維表面の少なくとも一部を構成している複合繊維をいう。なかでも、高温での寸法安定性の点で、同心芯鞘型が最も好ましい。 The heat-adhesive conjugate fiber of the present invention is a heat-adhesive conjugate fiber comprising a fiber-forming component and a heat-adhesive component. In the present invention, the heat-fusible conjugate fiber is a fiber-type component and a heat-adhesive component that are arranged in parallel, core-sheath type, eccentric core-sheath type, multi-layer type having three or more layers, and hollow parallel in the fiber cross section. This refers to a composite fiber that is compounded into a mold, a hollow core-sheath type, a deformed core-sheath type, a sea-island type, and the like, and the thermal adhesive component constitutes at least a part of the fiber surface. Of these, the concentric core-sheath type is most preferable from the viewpoint of dimensional stability at high temperatures.
繊維形成性成分と熱接着性成分の複合比は、熱接着性成分が好ましくは１０〜９０重量％の範囲、より好ましくは３０〜７０重量％の範囲であり、繊維形成性成分が好ましくは９０〜１０重量％、より好ましくは７０〜３０重量％の範囲である。熱接着性成分が１０重量％未満の場合、熱融着性が低下し、不織布強力が低下する傾向にある。逆に、９０重量％を超える場合、耐熱性が低下する傾向にある。 The composite ratio of the fiber-forming component and the heat-adhesive component is such that the heat-adhesive component is preferably in the range of 10 to 90% by weight, more preferably 30 to 70% by weight, and the fiber-forming component is preferably 90%. It is 10 to 10 weight%, More preferably, it is the range of 70 to 30 weight%. When the heat-adhesive component is less than 10% by weight, the heat-fusibility decreases and the strength of the nonwoven fabric tends to decrease. On the other hand, when it exceeds 90% by weight, the heat resistance tends to decrease.
上記熱接着性複合繊維は、中実繊維であっても中空繊維であってもよく、更に、繊維断面形状も丸断面に限定されることはなく、楕円断面、３〜８葉断面等の多葉断面、３〜８角形等の多角形断面など異形断面でもよい。 The heat-adhesive conjugate fiber may be a solid fiber or a hollow fiber, and the fiber cross-sectional shape is not limited to a round cross section. An irregular cross section such as a cross section of a leaf or a polygonal cross section such as a 3-8 octagon may be used.
また、上記熱接着性複合繊維の繊維長は２〜３０ｍｍの範囲、好ましくは３〜２０ｍｍの範囲である。２ｍｍ未満では不織布としてとき十分な強力が得られず、逆に３０ｍｍを超えると、エアレイド法でウェブを成形する際、空気分散性が劣化し、欠点の多い不織布となる。 Moreover, the fiber length of the said heat bondable conjugate fiber is the range of 2-30 mm, Preferably it is the range of 3-20 mm. If it is less than 2 mm, sufficient strength cannot be obtained as a nonwoven fabric. Conversely, if it exceeds 30 mm, the air dispersibility deteriorates when the web is formed by the airlaid method, and the nonwoven fabric has many defects.
本発明においては、繊維形成性成分を構成するポリマーは、融点が２２０℃以上である必要がある。ただし、上記繊維形成性成分の融点と、熱接着性成分の融点または軟化点との差が大きすぎると紡糸性が低下する傾向にあり、該繊維形成性成分の融点は２２０〜３００℃の範囲が好ましく、より好ましくは２２５〜２８０℃の範囲である。 In the present invention, the polymer constituting the fiber-forming component needs to have a melting point of 220 ° C. or higher. However, if the difference between the melting point of the fiber-forming component and the melting point or softening point of the heat-adhesive component is too large, the spinnability tends to decrease, and the melting point of the fiber-forming component is in the range of 220 to 300 ° C. Is more preferable, and the range of 225 to 280 ° C is more preferable.
上記熱接着性複合繊維は溶融紡糸により製造することが、コスト面や、溶剤などを使用しないため環境面からは好ましく、かかる溶融紡糸による成形を考えた場合、上記ポリマーとしては、ポリアルキレンテレフタレートが好ましい。また、ポリアルキレンテレフタレートとしては、ポリエチレンテレフタレート、ポリトリメチレンテレフタレート、ポリブチレンテレフタレートが挙げられるが、中でもポリエチレンテレフタレートが、融点および複合繊維としたときの剛性が高い点からより好ましい。 The heat-adhesive conjugate fiber is preferably produced by melt spinning from the viewpoint of cost and the environment because it does not use a solvent. When considering molding by melt spinning, the polymer may be polyalkylene terephthalate. preferable. Examples of the polyalkylene terephthalate include polyethylene terephthalate, polytrimethylene terephthalate, and polybutylene terephthalate. Among these, polyethylene terephthalate is more preferable because of its high melting point and high rigidity when used as a composite fiber.
一方、熱接着性成分を主として構成するポリマーは、融点が１３０〜２３０℃の範囲、好ましくは１５０〜２００℃の範囲、または、軟化点が５０〜１５０℃の範囲、好ましくは６０〜１２０℃の範囲で、かつ該融点または該軟化点が、上記繊維形成性成分の融点より２０℃以上、好ましくは３０℃以上、より好ましくは４０〜１５０℃低い必要がある。なお、ここで「主として構成する」とは、熱接着性成分の６０％重量以上、好ましくは６５％以上、より好ましくは７０％重量以上を構成することをいう。 On the other hand, the polymer mainly constituting the heat-adhesive component has a melting point of 130 to 230 ° C, preferably 150 to 200 ° C, or a softening point of 50 to 150 ° C, preferably 60 to 120 ° C. The melting point or the softening point must be 20 ° C. or more, preferably 30 ° C. or more, more preferably 40 to 150 ° C. lower than the melting point of the fiber-forming component. Here, “mainly constituting” means constituting 60% by weight or more, preferably 65% or more, more preferably 70% by weight or more of the thermal adhesive component.
かかる熱接着性成分としては、例えば、繊維形成性成分がポリエチレンテレフタレートの場合、ポリプロピレン、ナイロン６およびその共重合体、第三成分としてジカルボン酸あるいはジオールを共重合した融点が２４０℃以下のポリエチレンテレフタレート、ポリトリメチレンテレフタレートおよびその共重合体、ポリブチレンテレフタレートおよびその共重合体、ポリヘキサメチレンテレフタレートおよびその共重合体、ポリ乳酸系ポリマーなどが挙げられる。また、繊維形成性成分がポリトリメチレンテレフタレートの場合、熱接着性成分としては、ポリプロピレン、ジカルボン酸あるいはジオールを共重合した融点２００℃以下のポリエチレンテレフタレート、ジカルボン酸あるいはジオールを共重合した融点２００℃以下のポリトリメチレンテレフタレートおよびその共重合体、第三成分としてジカルボン酸あるいはジオールを共重合した融点２００℃以下のポリブチレンテレフタレートおよびその共重合体、ポリヘキサメチレンテレフタレートおよびその共重合体、ポリ乳酸系ポリマーなどが挙げられる。さらに、繊維形成性成分がポリブチレンテレフタレートの場合、熱接着性成分としては、ポリプロピレン、ジカルボン酸あるいはジオールを共重合した融点２００℃以下のポリエチレンテレフタレート、ジカルボン酸あるいはジオールを共重合した融点２００℃以下のポリトリメチレンテレフタレートおよびその共重合体、ジカルボン酸あるいはジオールを共重合した融点２００℃以下のポリブチレンテレフタレートおよびその共重合体、ポリヘキサメチレンテレフタレートおよびその共重合体、ポリ乳酸系ポリマーなどが挙げられる。 Examples of such a heat-adhesive component include polyethylene terephthalate having a melting point of 240 ° C. or less obtained by copolymerizing polypropylene, nylon 6 and a copolymer thereof, and dicarboxylic acid or diol as the third component when the fiber-forming component is polyethylene terephthalate. Polytrimethylene terephthalate and copolymers thereof, polybutylene terephthalate and copolymers thereof, polyhexamethylene terephthalate and copolymers thereof, and polylactic acid-based polymers. When the fiber-forming component is polytrimethylene terephthalate, the heat-adhesive component may be polypropylene, dicarboxylic acid or diol copolymerized with a melting point of 200 ° C. or lower, and polyethylene terephthalate, dicarboxylic acid or diol copolymerized with a melting point of 200 ° C. The following polytrimethylene terephthalate and copolymers thereof, polybutylene terephthalate having a melting point of 200 ° C. or less copolymerized with a dicarboxylic acid or diol as a third component and copolymers thereof, polyhexamethylene terephthalate and copolymers thereof, polylactic acid System polymers and the like. Further, when the fiber-forming component is polybutylene terephthalate, the heat-adhesive component includes polypropylene, dicarboxylic acid or diol copolymerized at a melting point of 200 ° C. or lower, and polyethylene terephthalate, dicarboxylic acid or diol copolymerized at a melting point of 200 ° C. or lower. Polytrimethylene terephthalate and its copolymer, polybutylene terephthalate having a melting point of 200 ° C. or less and a copolymer thereof copolymerized with dicarboxylic acid or diol, polyhexamethylene terephthalate and its copolymer, polylactic acid polymer, etc. It is done.
上記熱接着性成分の中でもポリエステル系ポリマー、特に以下に記載する、ジカルボン酸あるいはジオールを共重合した共重合ポリエチレンテレフタレート、ジカルボン酸あるいはジオールを共重合した共重合ポリブチレンテレフタレート、あるいは、ポリ乳酸系ポリマーが、自動車用フィルターや天ぷら油濾しフィルターなどに要求されるような極めて高温の条件で用いてもほとんど変形を生じないためより好適である。また、この際、かかる観点からは、上記熱接着性成分と、ポリアルキレンテレフタレートの繊維形成性成分との組み合わせが特に好ましい。 Among the above heat-adhesive components, polyester-based polymers, especially copolymerized polyethylene terephthalate copolymerized with dicarboxylic acid or diol, copolymerized polybutylene terephthalate copolymerized with dicarboxylic acid or diol, or polylactic acid-based polymer described below. However, it is more preferable because it hardly deforms even when used under extremely high temperature conditions required for automobile filters, tempura oil filter, and the like. At this time, from this point of view, a combination of the thermal adhesive component and the fiber-forming component of polyalkylene terephthalate is particularly preferable.
上記共重合ポリエチレンテレフタレートは、いずれもイソフタル酸を酸成分を基準として５〜３０モル％、より好ましくは５〜２５モル％共重合したものが耐熱性の点で特に好ましい。 Of the above copolymerized polyethylene terephthalates, those obtained by copolymerizing isophthalic acid in an amount of 5 to 30 mol%, more preferably 5 to 25 mol% based on the acid component are particularly preferred from the viewpoint of heat resistance.
また、上記共重合ポリブチレンテレフタレートは、いずれもイソフタル酸を、酸成分を基準として５〜４０モル％、より好ましくは５〜３５モル％共重合したものが耐熱性の点で特に好ましい。 Moreover, as for the said copolymerization polybutylene terephthalate, what all copolymerized isophthalic acid 5 to 40 mol% on the basis of an acid component, More preferably, 5-35 mol% is especially preferable at a heat resistant point.
なお、上記の共重合ポリエチレンテレフタレートおよび共重合ポリブチレンテレフタレートには、耐熱性やその他の物性を阻害しない範囲で、５−スルホイソフタル酸ナトリウムやアジピン酸、セバシン酸、アゼライン酸、ポリカプロラクトン、ジエチレングリコールやトリメチレングリコール、テトラメチレングリコール、シクロヘキサンジメタノール、ポリエチレングリコールなどが共重合されていてもよい。 The copolymerized polyethylene terephthalate and copolymerized polybutylene terephthalate include sodium 5-sulfoisophthalate, adipic acid, sebacic acid, azelaic acid, polycaprolactone, diethylene glycol, Trimethylene glycol, tetramethylene glycol, cyclohexanedimethanol, polyethylene glycol and the like may be copolymerized.
また、ポリ乳酸系ポリマーは、Ｌ乳酸が１００〜９０モル％、Ｄ乳酸が０〜１０モル％で構成されるポリ乳酸系ポリマーであることが、結晶性を上げ、融点を高し、耐熱性を向上できる点でより好ましい。より好ましいＬ乳酸の比率は１００〜９３モル％である。 The polylactic acid-based polymer is a polylactic acid-based polymer composed of L-lactic acid in an amount of 100 to 90 mol% and D lactic acid in an amount of 0 to 10 mol%. It is more preferable at the point which can improve. A more preferable ratio of L lactic acid is 100 to 93 mol%.
さらに耐熱性を向上するために、熱接着性成分にポリアルキレンテレフタレートを０．５〜３５重量％混合分散させることも有効な手段である。ポリアルキレンテレフタレートの中でも、融点の高いポリエチレンテレフタレートが好ましい。アルキレンテレフタレートの含有は０．５重量％未満では耐熱性向上効果が少なく、３５重量％以上では、熱接着性が乏しくなる傾向にある。より好ましいポリアルキレンテレフタレートの含有量は３〜３０重量％である。 Furthermore, in order to improve heat resistance, it is also an effective means to mix and disperse 0.5 to 35% by weight of polyalkylene terephthalate in the thermal adhesive component. Among the polyalkylene terephthalates, polyethylene terephthalate having a high melting point is preferable. When the content of alkylene terephthalate is less than 0.5% by weight, the effect of improving the heat resistance is small, and when it is 35% by weight or more, the thermal adhesiveness tends to be poor. A more preferable polyalkylene terephthalate content is 3 to 30% by weight.
以上に説明したポリマー、特に上記のような共重合ポリエチレンテレフタレート、共重合ポリブチレンテレフタレート、またはポリ乳酸を、熱接着性成分を主として構成するポリマーとして用いた場合、摩擦が高くなりやすく、空気開繊性が低下することがあるため、ポリオレフィン系ポリマーを０．５〜１５重量％混合分散させることが好ましい。これにより、不織布中の毛玉状欠点を格段に減少させることができる。上記ポリオレフィン系ポリマーとしては、ポリプロピレン、高密度ポリエチレン、中密度ポリエチレン、低密度ポリエチレン、線状低密度ポリエチレン、プロピレンと他のαオレフインからなる結晶性プロピレン共重合体、これらにスチレン、アクリル酸、メタクリル酸、マレイン酸等を共重合したものなどが例示できるが、特にマレイン酸共重合ポリオレフィンがポリエステルとの相溶性が良好であり、毛玉状欠点を減少させる効果が大きいため、より好ましい。また、ポリオレフィン系ポリマーの混合率が０．５重量％未満であると欠点減少効果が低下し、１５重量％を超えると、紡糸時の糸切れが発生し易くなる傾向にある。ポリオレフィン系ポリマーの混合率は、より好ましくは１〜１０重量％の範囲である。 When the above-described polymer, particularly the above-mentioned copolymerized polyethylene terephthalate, copolymerized polybutylene terephthalate, or polylactic acid is used as a polymer mainly composed of a heat-adhesive component, friction tends to be high, and air opening is performed. Therefore, it is preferable to mix and disperse the polyolefin polymer in an amount of 0.5 to 15% by weight. Thereby, the pill-shaped defect in a nonwoven fabric can be reduced significantly. Examples of the polyolefin polymer include polypropylene, high density polyethylene, medium density polyethylene, low density polyethylene, linear low density polyethylene, crystalline propylene copolymer composed of propylene and other α-olefin, and styrene, acrylic acid, methacrylic acid. Examples thereof include those obtained by copolymerization of acid, maleic acid, and the like, but maleic acid copolymerized polyolefin is particularly preferable because it has good compatibility with polyester and has a large effect of reducing hairball defects. Further, if the mixing ratio of the polyolefin-based polymer is less than 0.5% by weight, the effect of reducing defects is lowered, and if it exceeds 15% by weight, yarn breakage during spinning tends to easily occur. The mixing ratio of the polyolefin polymer is more preferably in the range of 1 to 10% by weight.
上記の繊維形成性成分を構成するポリマー、または、熱接着性成分を主として構成するポリマーには、必要に応じて、各種の添加剤、例えば、艶消し剤、熱安定剤、消泡剤、整色剤、難燃剤、酸化防止剤、紫外線吸収剤、蛍光増白剤、着色顔料などが含有されていてもよい。 For the polymer constituting the above-mentioned fiber-forming component or the polymer mainly constituting the heat-adhesive component, various additives such as a matting agent, a heat stabilizer, an antifoaming agent, a regulating agent are used as necessary. Colorants, flame retardants, antioxidants, ultraviolet absorbers, fluorescent brighteners, color pigments, and the like may be contained.
本発明の熱接着性複合繊維は、１２０℃乾熱収縮率を１５％以下、好ましくは１２％以下とする必要がある。上記乾熱収縮率が１５％を超えると、高温での不織布の寸法安定性が悪くなるだけでなく、熱接着後のエアレイドウェブに一部繊維が存在しない状態いわゆるクラックが発生し、特にフィルターなどとしたとき適正な性能を果たすことができない。 The heat-adhesive conjugate fiber of the present invention needs to have a 120 ° C. dry heat shrinkage of 15% or less, preferably 12% or less. When the dry heat shrinkage rate exceeds 15%, not only the dimensional stability of the nonwoven fabric at high temperature is deteriorated, but also a state in which some fibers are not present in the air-laid web after heat bonding, so-called cracks are generated. It is not possible to achieve proper performance.
我々は、以上に説明した繊維形成性成分と熱接着成分とからなる熱接着性複合繊維とし、上記収縮率とすることで、２〜３０ｍｍといった短い繊維長でも、クラックのない均一なエアレイド不織布が得られることを見出した。また、これにより、エアレイド不織布の、高温での寸法安定性を格段に向上させることができた。 We have a heat-adhesive conjugate fiber composed of the fiber-forming component and the heat-adhesive component described above, and a uniform air-laid nonwoven fabric without cracks, even with a short fiber length of 2 to 30 mm, with the shrinkage rate described above. It was found that it can be obtained. Moreover, by this, the dimensional stability at high temperature of the air laid nonwoven fabric could be remarkably improved.
上記熱接着性複合繊維の繊度は目的に応じて選択すればよく、特に限定されないが、一般的に０．０１〜５００デシテックス程度の範囲で用いられる。 The fineness of the heat-adhesive conjugate fiber may be selected according to the purpose and is not particularly limited, but is generally used in a range of about 0.01 to 500 dtex.
また、開繊性を良好にするため、接着性複合繊維の表面には油剤が付与されるが、その組成については特に限定を受けないが、炭素数１０〜２０であるアルキルリン酸アルカリ金属塩あるいは炭素数１０〜３０のアルキルエーテルを３０〜９０重量％、ポリオキシエチレン・ポリオキシプロピレングラフト重合ポリシロキサンあるいはポリジメチルシロキサンを１０〜７０重量％含む油剤が好ましい例として挙げられる。油剤付着率は０．０１〜５重量％が適正範囲である。０．０１重量％未満であると、エアレイドウェブ成形中に静電気が発生し易くなり、５重量％を超えると、繊維が集束し易くなり、空気開繊性が低下する傾向にある。 Further, in order to improve the spreadability, an oil agent is applied to the surface of the adhesive conjugate fiber, but the composition thereof is not particularly limited, but the alkyl phosphate alkali metal salt having 10 to 20 carbon atoms. Alternatively, preferred examples include an oil containing 30 to 90% by weight of an alkyl ether having 10 to 30 carbon atoms and 10 to 70% by weight of polyoxyethylene / polyoxypropylene graft-polymerized polysiloxane or polydimethylsiloxane. The oil agent adhesion rate is in an appropriate range of 0.01 to 5% by weight. If it is less than 0.01% by weight, static electricity is likely to be generated during air-laid web molding, and if it exceeds 5% by weight, the fibers tend to converge and the air opening property tends to be lowered.
本発明の熱接着性複合繊維は、たとえば以下の方法により製造することができる。
すなわち、前述した熱接着性成分および繊維形成性成分を構成するポリマーをチップ状とし、これらをそれぞれ乾燥した後、溶融して公知に複合紡糸口金に導入し、溶融複合繊維糸条として押し出し、口金下１５〜１００ｍｍの位置で冷却固化し３００〜２０００ｍ／分で巻き取り未延伸糸を得る。得られた未延伸糸を１５〜８０℃で、１．５〜７倍に延伸し、６０〜１００℃で定長あるいは弛緩熱セットして熱接着性複合繊維とすることができる。この際、熱収縮を下げるため、通常、延伸温度または熱セット温度を高めに設定するが、特に熱接着性成分が非晶性ポリエステルの場合は、該成分が融着を起こし、開繊性を著しく損なわれる。このため、ポリエチレングリコールおよびポリエチレンテレフタレートイソフタレート（ポリエチレングリコール／ポリエチレンテレフタレートイソフタレートの重量比率２０／８０〜９５／５）の共重合体とを０．０３〜５重量％含有するエマルジョン中で７５〜９８℃で延伸する方法や、７５〜９８℃温水中で延伸後直ちに３５℃以下の冷水で急冷する方法などを採用することにより、融着を抑制しながら目標の乾熱収縮率を達成することができる。
The heat-adhesive conjugate fiber of the present invention can be produced, for example, by the following method.
That is, the above-mentioned polymers constituting the heat-adhesive component and the fiber-forming component are made into chips, dried, melted and introduced into a known composite spinneret, extruded as a melted composite fiber yarn, It is cooled and solidified at a position of 15 to 100 mm below to obtain an undrawn yarn wound at 300 to 2000 m / min. The obtained undrawn yarn can be drawn 1.5 to 7 times at 15 to 80 ° C., and fixed length or relaxed heat set at 60 to 100 ° C. to obtain a heat-adhesive conjugate fiber. At this time, in order to reduce the heat shrinkage, the stretching temperature or the heat setting temperature is usually set higher. However, particularly when the heat-adhesive component is an amorphous polyester, the component causes fusion, and the opening property is reduced. Significantly damaged. Therefore, 75 to 98 in an emulsion containing 0.03 to 5% by weight of polyethylene glycol and a copolymer of polyethylene terephthalate isophthalate (polyethylene glycol / polyethylene terephthalate isophthalate in a weight ratio of 20/80 to 95/5). It is possible to achieve the target dry heat shrinkage rate while suppressing fusion by adopting a method of stretching at 75 ° C. or a method of rapidly cooling with cold water of 35 ° C. or less immediately after stretching in 75 to 98 ° C. warm water. it can.
本発明の熱接着性複合繊維は、公知のエアレイド法によりウェブとし、これを１３０〜２４０℃で熱処理して、高温雰囲気下においても優れた寸法安定性を示し、クラックがなく均一性に優れた不織布を得ることができる。 The heat-adhesive conjugate fiber of the present invention is made into a web by a known air laid method, heat-treated at 130 to 240 ° C., exhibits excellent dimensional stability even in a high temperature atmosphere, and has excellent uniformity without cracks. A nonwoven fabric can be obtained.
この際、後述する１７０℃のウェブ面積収縮率が寸法安定性の指標として適しており、これが好ましくは５％以下、より好ましくは３％であることが、高温での例えば、エアフィルターやオイルフィルターといった自動車用フィルターや、天ぷら油濾しフィルターやあくとりシート、ティーバッグなどの食品抽出用フィルターといった耐熱性が要求される分野に用いても、十分実用に耐えられるものであることがわかった。また、上記面積収縮率を満足するウェブでは、さらにこれを熱処理してもクラックが発生せず、均一な不織布を得ることができる。 At this time, a web area shrinkage rate of 170 ° C., which will be described later, is suitable as an index of dimensional stability, and this is preferably 5% or less, more preferably 3%, for example, an air filter or an oil filter at a high temperature. Even when used in fields requiring heat resistance, such as automobile filters, tempura oil filter filters, grilling sheets, tea bags, and other food extraction filters, it has been found that they are sufficiently practical. Moreover, in the web which satisfies the said area shrinkage rate, even if it heat-processes this, a crack does not generate | occur | produce and a uniform nonwoven fabric can be obtained.
また、本発明においては、後述するウェブ欠点数が、１０個／ｇ以下であることが好ましく、より好ましくは７個／ｇ以下である。これにより、外観なだけでなく、より均一性に優れた不織布とすることができる。 In the present invention, the number of web defects described below is preferably 10 / g or less, more preferably 7 / g or less. Thereby, it can be set as the nonwoven fabric excellent not only in appearance but in the uniformity.
以上に説明した、本発明の熱接着性複合繊維をエアレイド成形することにより、これらの性能を有するウェブを容易に成形することができる。 By performing air-laid molding of the heat-adhesive conjugate fiber of the present invention described above, a web having these performances can be easily molded.
以下、実施例により本発明を具体的に説明する。なお、実施例中の各物性は下記の方法より測定した。
（１）極限粘度（［η］）
オルトクロロフェノールを溶媒として、温度３５℃で測定した。
（２）メルトフローレイト（ＭＦＲ）
ＪＩＳ Ｋ７２１０記載の方法に従った。
（３）融点（Ｔｍ）
ＪＩＳ Ｋ７１２１記載の示査走査熱量測定（ＤＳＣ）に従って得たＤＳＣ曲線における吸熱ピーク温度として定義した。
（４）軟化点（Ｔｓ）
長さ１２６ｍｍ、幅１２ｍｍ、厚さ３ｍｍの試験片を作製し、ＪＩＳ Ｋ ７２０６に準拠してビカット軟化試験を行い、針状圧子が１ｍｍ侵入した時の伝熱媒体の温度を測定した。
（５）繊度
ＪＩＳ Ｌ １０１５ ７．５．１ Ａ法に記載の方法により測定した。
（６）繊維長
ＪＩＳ Ｌ １０１５ ７．４．１ Ｃ法に記載の方法により測定した。
（７）捲縮数、捲縮率
所定の繊維長に切断前のトウより単糸を取り、ＪＩＳ Ｌ １０１５ ７．１２に記載の方法により測定した。
（８）油剤付着率
所定繊維重量に対し、繊維から３０℃のメタノールによって浴比１：２０で１０分間抽出した残査の重量を測定し、所定繊維重量で除した値を用いた。
（９）１２０℃乾熱収縮率
ＪＩＳ Ｌ １０１５ ７．１５（２）に準拠し、１２０℃にて実施した。
（１０）ウェブ欠点数
Ｄａｎ−Ｗｅｂｆｏｒｍｉｎｇ社のフォーミングドラムユニット（６００ｍｍ幅、フォーミングドラムの孔形状２．４ｍｍ×２０ｍｍの長方形、開孔率４０％）を用いてドラム回転数２００ｒｐｍ、ニードルロール回転数９００ｒｐｍ、ウェブ搬送速度３０ｍ／分の条件で、熱接着性複合繊維の短繊維１００％からなる目付３０ｇ／ｍ２のエアレイドウェブを採取した。ウェブから１ｇ分を１０箇所ランダムに採取し、これに含まれる、繊維が平行に凝集した未開繊束で長さが１ｍｍ以上であるものと直径５ｍｍ以上の毛玉状欠点を数えて、１ｇ当りの平均個数を算出した。
（１１）１７０℃ウェブ面積収縮率
上記の方法により成形した、熱接着性複合繊維の短繊維１００％からなる目付３０ｇ／ｍ２、２０ｃｍ角の正方形のエアレイドウェブを、１７０℃に維持した熱風乾燥機（佐竹化学機械工業株式会社製熱風循環恒温乾燥器：４１−Ｓ４）中に２分間放置して熱処理を行い、収縮処理前のシート面積Ａ０と収縮処理後の面積Ａ１から下記の式により求め面積収縮率とする。
面積収縮率（％）＝〔（Ａ０−Ａ１）／Ａ０〕×１００
（１２）クラック発生状態
上記（１０）の方法でエアレイドウェブを成形し、該ウェブを３０ｍ／分で搬送した状態で、さらに連続して熱風１７０℃で熱処理を施し、これを引き取り、クラック（ウェブに一部繊維が存在しない状態）の発生状態を目視により評価した。
Hereinafter, the present invention will be described specifically by way of examples. In addition, each physical property in an Example was measured with the following method.
(1) Intrinsic viscosity ([η])
Measurement was performed at a temperature of 35 ° C. using orthochlorophenol as a solvent.
(2) Melt flow rate (MFR)
The method described in JIS K7210 was followed.
(3) Melting point (Tm)
It was defined as the endothermic peak temperature in the DSC curve obtained according to the scanning scanning calorimetry (DSC) described in JIS K7121.
(4) Softening point (Ts)
A test piece having a length of 126 mm, a width of 12 mm, and a thickness of 3 mm was prepared, and a Vicat softening test was performed according to JIS K 7206, and the temperature of the heat transfer medium when the needle-like indenter entered 1 mm was measured.
(5) Fineness Measured by the method described in JIS L 1015 7.5.1 Method A.
(6) Fiber length Measured by the method described in JIS L 1015 7.4.1 C method.
(7) Number of crimps and crimp rate A single yarn was taken from a tow before cutting at a predetermined fiber length and measured by the method described in JIS L 1015 7.12.
(8) Oil agent adhesion rate The weight of the residue extracted from the fiber with methanol at 30 ° C. at a bath ratio of 1:20 for 10 minutes with respect to the predetermined fiber weight and divided by the predetermined fiber weight was used.
(9) 120 degreeC dry heat shrinkage rate It implemented at 120 degreeC based on JISL10157.15 (2).
(10) Number of Web Defects Using Dan-Webforming's forming drum unit (600 mm width, forming drum hole shape 2.4 mm × 20 mm rectangle, opening rate 40%), drum rotation speed 200 rpm, needle roll rotation speed 900 rpm, An airlaid web having a basis weight of 30 g / m 2 made of 100% short fibers of a heat-adhesive conjugate fiber was collected under a web conveying speed of 30 m / min. 10 g of 1g was randomly collected from the web, and included in this unopened bundle of fibers agglomerated in parallel, counting the length of 1 mm or more and fuzzy defects of 5 mm or more in diameter, the average per 1 g The number was calculated.
(11) 170 ° C. was molded by the web area shrinkage percentage above method, hot air drying the basis weight 30 g / m 2, 20 cm square square air laid web of staple fibers of 100% heat-adhesive composite fibers was maintained at 170 ° C. machine (Satake chemical machinery industry Co., Ltd. hot air-circulating thermostat dryer: 41-S4) performed left to heat treatment for 2 minutes in, by the formula from the area A1 below after shrinkage processing sheet area a 0 before shrinkage treatment Determine the area shrinkage rate.
Area shrinkage rate (%) = [(A 0 −A 1 ) / A 0 ] × 100
(12) Crack generation state An airlaid web was formed by the method of (10) above, and the web was conveyed at 30 m / min. The state of occurrence of a state in which some fibers are not present was visually evaluated.
［実施例１］
熱接着性成分として、３５℃で４８時間真空乾燥した固有粘度［η］が０．５７、Ｔｓが６５℃の共重合ポリエチレンテレフタレート・イソフタレート（ｃｏＰＥＴ−１；イソフタル酸３０モル％、ジエチレングリコール４モル％共重合）とマレイン酸が０．５重量％共重合された低密度ポリエチレン（ＭＦＲ８ｇ／１０分、Ｔｍ９８℃）を各々９５：５の比率でチップブレンドしたものを用い、繊維形成性成分として、１２０℃で１６時間真空乾燥した固有粘度［η］が０．６１、Ｔｍが２５６℃のポリエチレンテレフタレート（ＰＥＴ）を用い、これらを各々別のエクストルーダーで溶融し、各々２５０℃と２８０℃の溶融ポリマーとして、前者を鞘成分Ａ、後者を芯成分Ｂとし、複合比率Ａ：Ｂ＝５０：５０（重量比）として、円形の吐出孔を１０３２孔有する芯鞘型複合紡糸口金を用いて、複合化して溶融吐出させた。この際、口金温度は２８０℃、吐出量は７５０ｇ／分であった。さらに、吐出ポリマーを口金下３５ｍｍの位置で３０℃の冷却風で空冷し１０００ｍ／分で巻き取り、未延伸糸を得た。この未延伸糸を、７０℃としたポリエチレングリコールとポリエチレンテレフタレート／イソフタレートのポリエーテルエステルの０．５重量％エマルジョン中で３．１倍に延伸し、引き続いて９０℃とした前述ポリエーテルエステルエマルジョン中で１．１５倍に延伸した後、ステアリルホスフェートカリウム塩／ジメチルシリコーン＝６５／３５（重量比）からなる油剤を０．２０重量％付与した後、押込み型クリンパーで捲縮数１１山／２５ｍｍ、捲縮率９％の平面ジグザグ型捲縮を付与し、７５℃で６０分間乾燥した後、５ｍｍの繊維長にカットし、繊度が２．３デシテックス、１２０℃乾熱収縮率が１２％の短繊維を得た。得られた短繊維を用いて前述した「（１０）のウェブ欠点数」に記載した方法によりエアレイドウェブを成形した。１７０℃ウェブ面積収縮率は３％であり、クラック発生は認められなかった。また、ウェブ欠点数は５個（未開繊束３個、毛玉２個）であった。
[Example 1]
As thermal adhesive components, copolymer polyethylene terephthalate / isophthalate (coPET-1; isophthalic acid 30 mol%, diethylene glycol 4 mol) having an intrinsic viscosity [η] of 0.57 and Ts of 65 ° C. dried at 35 ° C. for 48 hours. % Copolymerization) and low-density polyethylene (MFR 8 g / 10 min, Tm 98 ° C.) copolymerized with 0.5% by weight of maleic acid in a chip blend ratio of 95: 5, respectively, Polyethylene terephthalate (PET) with an intrinsic viscosity [η] of 0.61 and Tm of 256 ° C., which was vacuum-dried at 120 ° C. for 16 hours, was melted with a separate extruder, and melted at 250 ° C. and 280 ° C., respectively. As a polymer, the former is the sheath component A, the latter is the core component B, and the composite ratio A: B = 50: 50 (weight ratio) is used. Using a core-sheath type composite spinneret having 1032 outlet holes, they were combined and melted and discharged. At this time, the die temperature was 280 ° C., and the discharge rate was 750 g / min. Further, the discharged polymer was air-cooled with a cooling air of 30 ° C. at a position 35 mm below the base and wound at 1000 m / min to obtain an undrawn yarn. The unstretched yarn was stretched 3.1 times in a 0.5% by weight emulsion of polyethylene glycol and polyethylene terephthalate / isophthalate polyether ester at 70 ° C., and subsequently the polyether ester emulsion at 90 ° C. After stretching 1.15 times, 0.20% by weight of an oil agent comprising stearyl phosphate potassium salt / dimethyl silicone = 65/35 (weight ratio) was applied, and then the number of crimps was 11 peaks / 25 mm with an indentation type crimper. A flat zigzag crimp with a crimp rate of 9% was applied, dried at 75 ° C. for 60 minutes, cut to a fiber length of 5 mm, a fineness of 2.3 dtex, and a 120 ° C. dry heat shrinkage of 12%. Short fibers were obtained. An airlaid web was molded by the method described in the above-mentioned “(10) Number of web defects” using the obtained short fibers. The 170 ° C. web area shrinkage was 3%, and no cracks were observed. The number of web defects was 5 (3 unopened bundles, 2 pills).
［比較例１］
熱接着性成分として、３５℃で４８時間真空乾燥した固有粘度［η］が０．５７、Ｔｓが６５℃の共重合ポリエチレンテレフタレート・イソフタレート（ｃｏＰＥＴ−１；イソフタル酸３０モル％、ジエチレングリコール４モル％共重合を用い、繊維形成性成分として、１２０℃で１６時間真空乾燥した固有粘度［η］が０．６１、Ｔｍが２５６℃のポリエチレンテレフタレート（ＰＥＴ）を用い、これらを各々別のエクストルーダーで溶融し、各々２５０℃と２８０℃の溶融ポリマーとして、前者を鞘成分Ａ、後者を芯成分Ｂとし、複合比率Ａ：Ｂ＝５０：５０（重量比）として、円形の吐出孔を１０３２孔有する芯鞘型複合紡糸口金を用いて、複合化して溶融吐出させた。この際、口金温度は２８０℃、吐出量は７５０ｇ／分であった。さらに、吐出ポリマーを口金下３５ｍｍの位置で３０℃の冷却風で空冷し１０００ｍ／分で巻き取り、未延伸糸を得た。この未延伸糸を、５５℃の温水中で３．１倍に延伸し、引き続いて５０℃の温水中で１．１５倍に延伸した後、ステアリルホスフェートカリウム塩／ジメチルシリコーン＝６５／３５（重量比）からなる油剤を０．２０重量％付与した後、押込み型クリンパーで捲縮数１１山／２５ｍｍ、捲縮率９％の平面ジグザグ型捲縮を付与し、５５℃で６０分間乾燥した後、５ｍｍの繊維長にカットし、繊度が２．３デシテックスの短繊維を得た。このときの１２０℃乾熱収縮率は熱収縮大で測定不可（８０℃乾熱収縮率は８％）であった。得られた短繊維を用いて実施例１と同様にしてエアレイドウェブを成形した。１７０℃ウェブ面積収縮率は９５％（干物状）であり、ウェブ全体に横筋状のクラックが発生していた。また、ウェブ欠点数は６０個（未開繊束５０個、毛玉１０個）であった。
[Comparative Example 1]
As thermal adhesive components, copolymer polyethylene terephthalate / isophthalate (coPET-1; isophthalic acid 30 mol%, diethylene glycol 4 mol) having an intrinsic viscosity [η] of 0.57 and Ts of 65 ° C. dried at 35 ° C. for 48 hours. Polyethylene terephthalate (PET) having an intrinsic viscosity [η] of 0.61 and Tm of 256 ° C., which was vacuum-dried at 120 ° C. for 16 hours, was used as a fiber-forming component. The polymer is melted at 250 ° C. and 280 ° C., the former is the sheath component A, the latter is the core component B, the composite ratio A: B = 50: 50 (weight ratio), and the circular discharge holes are 1032 holes. The core-sheath type composite spinneret was combined and melted and discharged, with the base temperature being 280 ° C. and the discharge rate being 750 g / min. Further, the discharged polymer was air-cooled with a cooling air of 30 ° C. at a position 35 mm below the base and wound at 1000 m / min to obtain an undrawn yarn, which was 3.1 times in 55 ° C. warm water. And then stretched 1.15 times in warm water of 50 ° C., and then 0.22% by weight of an oil agent comprising stearyl phosphate potassium salt / dimethylsilicone = 65/35 (weight ratio) was applied, and then pressed. A flat zigzag crimp with 11 crimps / 25 mm crimp and 9% crimp is applied with a crimper, dried at 55 ° C. for 60 minutes, cut to a fiber length of 5 mm, and a fineness of 2.3 dtex A short fiber was obtained, and the 120 ° C. dry heat shrinkage rate was large and could not be measured (the dry heat shrinkage rate was 80% at 80 ° C.) Similar to Example 1 using the obtained short fiber. An airlaid web was formed as follows: 170 ° C web 95% are the product shrinkage (dried fish like), a lateral streak cracks throughout the web has occurred. In addition, were the web disadvantage number 60 (50 savage 繊束 ten pill).
［参考例２］
熱接着性成分として、３５℃で４８時間真空乾燥した固有粘度［η］が０．５７、Ｔｓが６５℃の低軟化点共重合ポリエチレンテレフタレート・イソフタレート（ｃｏＰＥＴ−１；イソフタル酸３０モル％、ジエチレングリコール４モル％共重合）と固有粘度［η］が０．６１、Ｔｍが２５６℃のポリエチレンテレフタレート（ＰＥＴ）を各々９０：１０の比率でチップブレンドしたものを用い、繊維形成性成分として、１２０℃で１６時間真空乾燥した固有粘度［η］が０．６１、Ｔｍが２５６℃のポリエチレンテレフタレート（ＰＥＴ）を用い、これら各々別のエクストルーダーで溶融し、各々２７０℃と２８０℃の溶融ポリマーとして、前者を鞘成分Ａ、後者を芯成分Ｂとし、複合比率Ａ：Ｂ＝５０：５０（重量比）として、円形の吐出孔を１０３２孔有する芯鞘型複合紡糸口金を用いて、複合化して溶融吐出させた。この際、口金温度は２８０℃、吐出量は７５０ｇ／分であった。さらに、吐出ポリマーを口金下３５ｍｍの位置で３０℃の冷却風で空冷し１０００ｍ／分で巻き取り、未延伸糸を得た。この未延伸糸を、７５℃としたポリエチレングリコールとポリエチレンテレフタレート／イソフタレートのポリエーテルエステルの０．５重量％エマルジョン中で３．１倍に延伸し、引き続いて９６℃とした前述ポリエーテルエステルエマルジョン中で１．１５倍に延伸した後、ステアリルホスフェートカリウム塩／ジメチルシリコーン＝６５／３５（重量比）からなる油剤を０．２０重量％付与した後、押込み型クリンパーで捲縮数１０山／２５ｍｍ、捲縮率８％の平面ジグザグ型捲縮を付与し、７５℃で６０分間乾燥した後、５ｍｍの繊維長にカットし、繊度が２．３デシテックス、１２０℃乾熱収縮率が９％の短繊維を得た。得られた短繊維を用いて実施例１と同様にしてエアレイドウェブを成形した。１７０℃ウェブ面積収縮率は２．５％であり、クラックの発生は認められなかった。また、ウェブ欠点数は３個（未開繊束２個、毛玉１個）であった。
[Reference Example 2]
As a heat-adhesive component, low-softening point copolymerized polyethylene terephthalate / isophthalate (coPET-1; isophthalic acid 30 mol%) having an intrinsic viscosity [η] of 0.57 and Ts of 65 ° C. dried at 35 ° C. for 48 hours. Diethylene glycol 4 mol% copolymerization) and polyethylene terephthalate (PET) having an intrinsic viscosity [η] of 0.61 and Tm of 256 ° C. in a chip blend ratio of 90:10, respectively, Polyethylene terephthalate (PET) with an intrinsic viscosity [η] of 0.61 and Tm of 256 ° C., which was vacuum-dried at 16 ° C. for 16 hours, was melted with each of these different extruders, and melted at 270 ° C. and 280 ° C., respectively. The former is the sheath component A, the latter is the core component B, and the composite ratio A: B = 50: 50 (weight ratio) is a circular discharge. Using core-sheath type composite spinneret having 1032 holes, melted discharges the composite. At this time, the die temperature was 280 ° C., and the discharge rate was 750 g / min. Further, the discharged polymer was air-cooled with a cooling air of 30 ° C. at a position 35 mm below the base and wound at 1000 m / min to obtain an undrawn yarn. The unstretched yarn was stretched 3.1 times in a 0.5% by weight emulsion of polyethylene glycol and polyethylene terephthalate / isophthalate polyether ester at 75 ° C., and then the polyether ester emulsion at 96 ° C. After stretching to 1.15 times, 0.20% by weight of an oil agent comprising stearyl phosphate potassium salt / dimethylsilicone = 65/35 (weight ratio) was applied, and then the number of crimps was 10 peaks / 25 mm with an indentation type crimper. A flat zigzag crimp with a crimp rate of 8% was applied, dried at 75 ° C. for 60 minutes, cut to a fiber length of 5 mm, a fineness of 2.3 dtex, and a 120 ° C. dry heat shrinkage of 9%. Short fibers were obtained. An airlaid web was molded using the obtained short fibers in the same manner as in Example 1. The 170 ° C. web area shrinkage was 2.5%, and no cracks were observed. Moreover, the number of web defects was 3 (2 unopened bundles, 1 pill).
［実施例３］
熱接着性成分として、８０℃で２４時間真空乾燥した固有粘度［η］が０．５６、Ｔｍが２２０℃の共重合ポリエチレンテレフタレート・イソフタレート（ｃｏＰＥＴ−２；イソフタル酸１０モル％共重合）とマレイン酸が０．５重量％共重合された低密度ポリエチレン（ＭＦＲ８ｇ／１０分、Ｔｍ９８℃）を各々９５：５の比率でチップブレンドしたものを用い、繊維形成性成分として、１２０℃で１６時間真空乾燥した固有粘度［η］が０．６１、Ｔｍが２５６℃のポリエチレンテレフタレート（ＰＥＴ）を用い、これらを各々別のエクストルーダーで溶融し、各々２６５℃と２８０℃の溶融ポリマーとして、前者を鞘成分Ａ、後者を芯成分Ｂとし、複合比率Ａ：Ｂ＝５０：５０（重量比）として、円形の吐出孔を１０３２孔有する芯鞘型複合紡糸口金を用いて、複合化して溶融吐出させた。この際、口金温度は２８０℃、吐出量は７５０ｇ／分であった。さらに、吐出ポリマーを口金下３５ｍｍの位置で３０℃の冷却風で空冷し１１００ｍ／分で巻き取り、未延伸糸を得た。この未延伸糸を、７０℃の温水中で３．１５倍に延伸し、引き続いて９０℃の温水中で１．１５倍に延伸した後、ステアリルホスフェートカリウム塩／ジメチルシリコーン＝６５／３５（重量比）からなる油剤を０．２０重量％付与した後、押込み型クリンパーで捲縮数１０山／２５ｍｍ、捲縮率１０％の平面ジグザグ型捲縮を付与し、１２５℃で６０分間乾燥した後、５ｍｍの繊維長にカットし、繊度が２．１デシテックス、１２０℃乾熱収縮率が０．５％の短繊維を得た。得られた短繊維を用いて実施例１と同様にしてエアレイドウェブを成形した。１７０℃ウェブ面積収縮率は０．２％であり、クラックの発生は認められなかった。また、ウェブ欠点数は３個（未開繊束３個、毛玉０個）であった。
[Example 3]
Copolymerized polyethylene terephthalate / isophthalate (coPET-2; copolymer of 10 mol% isophthalic acid) having an intrinsic viscosity [η] of 0.56 and Tm of 220 ° C., which was vacuum-dried at 80 ° C. for 24 hours, Low-density polyethylene copolymerized with 0.5% by weight of maleic acid (MFR 8 g / 10 min, Tm 98 ° C.) is used as a fiber-forming component for 16 hours at 120 ° C. for 16 hours. Vacuum-dried polyethylene terephthalate (PET) having an intrinsic viscosity [η] of 0.61 and Tm of 256 ° C. was melted with separate extruders, and the former was obtained as a molten polymer of 265 ° C. and 280 ° C., respectively. A sheath-core type having a sheath component A, the latter being a core component B, a composite ratio A: B = 50: 50 (weight ratio), and 1032 circular discharge holes The composite spinneret was used to form a composite and melt discharge. At this time, the die temperature was 280 ° C. and the discharge rate was 750 g / min. Further, the discharged polymer was air-cooled with 30 ° C. cooling air at a position 35 mm below the base, and wound at 1100 m / min to obtain an undrawn yarn. This undrawn yarn was drawn 3.15 times in warm water at 70 ° C. and subsequently drawn 1.15 times in warm water at 90 ° C., and then stearyl phosphate potassium salt / dimethyl silicone = 65/35 (weight) After applying 0.20% by weight of the oil composition comprising the ratio, a flat zigzag crimp with a crimp of 10 ridges / 25 mm and a crimp rate of 10% was applied with an indentation type crimper and dried at 125 ° C. for 60 minutes. Cut to a fiber length of 5 mm, short fibers having a fineness of 2.1 dtex and a 120 ° C. dry heat shrinkage of 0.5% were obtained. An airlaid web was molded using the obtained short fibers in the same manner as in Example 1. The 170 ° C. web area shrinkage was 0.2%, and no cracks were observed. The number of web defects was 3 (3 unopened bundles, 0 pills).
［実施例４］
熱接着性成分として、８０℃で２４時間真空乾燥した固有粘度［η］が０．５５、Ｔｍが１５１℃の共重合ポリブチレンテレフタレート・イソフタレート（ｃｏＰＢＴ；イソフタル酸２５モル％、エチレングリコール３５モル％共重合）とマレイン酸が０．５重量％共重合された低密度ポリエチレン（ＭＦＲ８ｇ／１０分、Ｔｍ９８℃）を各々９５：５の比率でチップブレンドしたものを用い、繊維形成性成分として、１２０℃で１６時間真空乾燥した固有粘度［η］が０．６１、Ｔｍが２５６℃のポリエチレンテレフタレート（ＰＥＴ）を用い、これらを各々別のエクストルーダーで溶融し、各々２５５℃と２８０℃の溶融ポリマーとして、前者を鞘成分Ａ、後者を芯成分Ｂとし、複合比率Ａ：Ｂ＝５０：５０（重量比）として、円形の吐出孔を１０３２孔有する芯鞘型複合紡糸口金を用いて、複合化して溶融吐出させた。この際、口金温度は２８０℃、吐出量は７５０ｇ／分であった。さらに、吐出ポリマーを口金下３５ｍｍの位置で３０℃の冷却風で空冷し１１００ｍ／分で巻き取り、未延伸糸を得た。この未延伸糸を、７０℃の温水中で３．１倍に延伸し、引き続いて９０℃の温水中で１．１５倍に延伸した後、ステアリルホスフェートカリウム塩／ジメチルシリコーン＝６５／３５（重量比）からなる油剤を０．２０重量％付与した後、押込み型クリンパーで捲縮数９山／２５ｍｍ、捲縮率８％の平面ジグザグ型捲縮を付与し、８５℃で６０分間乾燥した後、５ｍｍの繊維長にカットし、繊度が２．１デシテックス、１２０℃乾熱収縮率は８％の短繊維を得た。得られた短繊維を用いて実施例１と同様にしてエアレイドウェブを成形した。１７０℃ウェブ面積収縮率は２％であり、クラックの発生は認められなかった。また、ウェブ欠点数は６個（未開繊束４個、毛玉２個）であった。
[Example 4]
Copolymer polybutylene terephthalate / isophthalate (coPBT; isophthalic acid 25 mol%, ethylene glycol 35 mol) having an intrinsic viscosity [η] of 0.55 and Tm of 151 ° C. after 24 hours of vacuum drying at 80 ° C. % Copolymerization) and low-density polyethylene (MFR 8 g / 10 min, Tm 98 ° C.) copolymerized with 0.5% by weight of maleic acid in a chip blend ratio of 95: 5, respectively, Polyethylene terephthalate (PET) with an intrinsic viscosity [η] of 0.61 and Tm of 256 ° C., which was vacuum-dried at 120 ° C. for 16 hours, was melted with a separate extruder, and melted at 255 ° C. and 280 ° C., respectively. As a polymer, the former is the sheath component A, the latter is the core component B, and the composite ratio A: B = 50: 50 (weight ratio) is used as a circular discharge. Using a core-sheath type composite spinneret having 1032 holes, they were combined and melted and discharged. At this time, the die temperature was 280 ° C. and the discharge rate was 750 g / min. Further, the discharged polymer was air-cooled with 30 ° C. cooling air at a position 35 mm below the base, and wound at 1100 m / min to obtain an undrawn yarn. This undrawn yarn was stretched 3.1 times in warm water at 70 ° C. and subsequently stretched 1.15 times in warm water at 90 ° C., and then stearyl phosphate potassium salt / dimethyl silicone = 65/35 (weight) After applying 0.20% by weight of the oil composition consisting of a ratio), a flat zigzag crimp with a crimping number of 9/25 mm and a crimping rate of 8% was applied with an indentation type crimper and dried at 85 ° C. for 60 minutes. Cut to a fiber length of 5 mm, a short fiber having a fineness of 2.1 dtex and a 120 ° C. dry heat shrinkage of 8% was obtained. An airlaid web was molded using the obtained short fibers in the same manner as in Example 1. The 170 ° C. web area shrinkage was 2%, and no cracks were observed. Moreover, the number of web defects was 6 (4 unopened bundles, 2 pills).
［実施例５］
熱接着性成分として、６０℃で２４時間真空乾燥した固有粘度［η］が１．０、Ｔｍが１６８℃のＬ乳酸／Ｄ乳酸＝９５／５（モル比）であるポリ乳酸（ＰＬＡ）とマレイン酸が０．５重量％共重合された低密度ポリエチレン（ＭＦＲ８ｇ／１０分、Ｔｍ９８℃）を各々９８：２の比率でチップブレンドしたものを用い、繊維形成性成分として、１２０℃で１６時間真空乾燥した固有粘度［η］が０．６１、Ｔｍが２５６℃のポリエチレンテレフタレート（ＰＥＴ）を用い、これらを各々別のエクストルーダーで溶融し、各々２６０℃と２８０℃の溶融ポリマーとして、前者を鞘成分Ａ、後者を芯成分Ｂとし、複合比率Ａ：Ｂ＝５０：５０（重量比）として、円形の吐出孔を１０３２孔有する芯鞘型複合紡糸口金を用いて、複合化して溶融吐出させた。この際、口金温度は２８０℃、吐出量は７５０ｇ／分であった。さらに、吐出ポリマーを口金下３５ｍｍの位置で３０℃の冷却風で空冷し１１００ｍ／分で巻き取り、未延伸糸を得た。この未延伸糸を、７０℃の温水中で３．０倍に延伸し、引き続いて９０℃の温水中で１．１５倍に延伸した後、ステアリルホスフェートカリウム塩／ジメチルシリコーン＝６５／３５（重量比）からなる油剤を０．２０重量％付与した後、押込み型クリンパーで捲縮数１１山／２５ｍｍ、捲縮率１０％の平面ジグザグ型捲縮を付与し、６５℃で６０分間乾燥した後、５ｍｍの繊維長にカットし、繊度が２．２デシテックス、１２０℃乾熱収縮率が３％の短繊維を得た。得られた短繊維を用いて実施例１と同様にしてエアレイドウェブを成形した。１７０℃ウェブ面積収縮率は１．２％であり、クラックの発生は認められなかった。また、ウェブ欠点数は８個（未開繊束６個、毛玉２個）であった。
[Example 5]
As a heat-adhesive component, polylactic acid (PLA) having an intrinsic viscosity [η] of 1.0 and Tm of 168 ° C., which was vacuum-dried at 60 ° C. for 24 hours, and Llactic acid / D lactic acid = 95/5 (molar ratio); Low-density polyethylene copolymerized with 0.5% by weight of maleic acid (MFR 8 g / 10 min, Tm 98 ° C.) in a chip blend ratio of 98: 2 each, and fiber forming component at 120 ° C. for 16 hours Vacuum-dried polyethylene terephthalate (PET) having an intrinsic viscosity [η] of 0.61 and Tm of 256 ° C. is melted with a separate extruder, and the former is obtained as a molten polymer of 260 ° C. and 280 ° C., respectively. The sheath component A, the latter as the core component B, and the composite ratio A: B = 50: 50 (weight ratio), using a core-sheath type compound spinneret having 1032 circular discharge holes, compounded and melt discharged. I let you. At this time, the die temperature was 280 ° C., and the discharge rate was 750 g / min. Further, the discharged polymer was air-cooled with 30 ° C. cooling air at a position 35 mm below the base, and wound at 1100 m / min to obtain an undrawn yarn. This undrawn yarn was drawn 3.0 times in warm water at 70 ° C. and then drawn 1.15 times in warm water at 90 ° C., and then stearyl phosphate potassium salt / dimethyl silicone = 65/35 (weight) After applying 0.20% by weight of the oil agent comprising the ratio, a flat zigzag crimp with 11 crimps / 25 mm of crimps and a crimp rate of 10% was applied with an indentation type crimper and dried at 65 ° C. for 60 minutes. Cut to a fiber length of 5 mm, short fibers having a fineness of 2.2 dtex and a 120 ° C. dry heat shrinkage of 3% were obtained. An airlaid web was molded using the obtained short fibers in the same manner as in Example 1. The 170 ° C. web area shrinkage ratio was 1.2%, and no cracks were observed. The number of web defects was 8 (6 unopened bundles, 2 pills).
本発明の熱接着性複合繊維からは、クラックのない均一な不織布を得ることができる。また、得られた不織布は高温での寸法安定性にも優れている。このため、本発明の熱接着性複合繊維は、従来のエアレイド不織布では用途展開が難しかった、エアフィルターやオイルフィルターといった自動車用フィルターや、天ぷら油濾しフィルターやあくとりシート、ティーバッグなどの食品抽出用フィルターといった耐熱性が要求される分野にも十分応用可能なものである。 A uniform nonwoven fabric without cracks can be obtained from the heat-adhesive conjugate fiber of the present invention. Moreover, the obtained nonwoven fabric is excellent also in the dimensional stability at high temperature. For this reason, the heat-adhesive conjugate fiber of the present invention is difficult to develop for conventional airlaid nonwoven fabrics, such as automotive filters such as air filters and oil filters, tempura oil filter filters, cooking sheets, tea bags and other food extraction It can be sufficiently applied to fields requiring heat resistance such as industrial filters.
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