JP2011074506A - Thermally adhesive conjugated fiber for wet nonwoven fabric - Google Patents
Thermally adhesive conjugated fiber for wet nonwoven fabric Download PDFInfo
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- 239000000835 fiber Substances 0.000 title claims abstract description 100
- 239000000853 adhesive Substances 0.000 title claims abstract description 84
- 230000001070 adhesive effect Effects 0.000 title claims abstract description 35
- 239000004745 nonwoven fabric Substances 0.000 title abstract description 28
- -1 polypropylene Polymers 0.000 claims abstract description 35
- 238000002844 melting Methods 0.000 claims abstract description 23
- 230000008018 melting Effects 0.000 claims abstract description 23
- PPBRXRYQALVLMV-UHFFFAOYSA-N Styrene Chemical compound C=CC1=CC=CC=C1 PPBRXRYQALVLMV-UHFFFAOYSA-N 0.000 claims abstract description 18
- 229920000728 polyester Polymers 0.000 claims abstract description 18
- 229920000098 polyolefin Polymers 0.000 claims abstract description 16
- OFOBLEOULBTSOW-UHFFFAOYSA-N Propanedioic acid Natural products OC(=O)CC(O)=O OFOBLEOULBTSOW-UHFFFAOYSA-N 0.000 claims abstract description 14
- VZCYOOQTPOCHFL-UPHRSURJSA-N maleic acid Chemical compound OC(=O)\C=C/C(O)=O VZCYOOQTPOCHFL-UPHRSURJSA-N 0.000 claims abstract description 11
- 239000011976 maleic acid Substances 0.000 claims abstract description 11
- VZCYOOQTPOCHFL-UHFFFAOYSA-N trans-butenedioic acid Natural products OC(=O)C=CC(O)=O VZCYOOQTPOCHFL-UHFFFAOYSA-N 0.000 claims abstract description 11
- SMZOUWXMTYCWNB-UHFFFAOYSA-N 2-(2-methoxy-5-methylphenyl)ethanamine Chemical compound COC1=CC=C(C)C=C1CCN SMZOUWXMTYCWNB-UHFFFAOYSA-N 0.000 claims abstract description 9
- NIXOWILDQLNWCW-UHFFFAOYSA-N 2-Propenoic acid Natural products OC(=O)C=C NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 claims abstract description 9
- CERQOIWHTDAKMF-UHFFFAOYSA-N Methacrylic acid Chemical compound CC(=C)C(O)=O CERQOIWHTDAKMF-UHFFFAOYSA-N 0.000 claims abstract description 9
- 229920001283 Polyalkylene terephthalate Polymers 0.000 claims abstract description 7
- 239000004721 Polyphenylene oxide Substances 0.000 claims abstract description 7
- 229920001903 high density polyethylene Polymers 0.000 claims abstract description 7
- 239000004700 high-density polyethylene Substances 0.000 claims abstract description 7
- 229920000570 polyether Polymers 0.000 claims abstract description 7
- 239000004743 Polypropylene Substances 0.000 claims abstract description 5
- 229920000092 linear low density polyethylene Polymers 0.000 claims abstract description 5
- 239000004707 linear low-density polyethylene Substances 0.000 claims abstract description 5
- 229920001155 polypropylene Polymers 0.000 claims abstract description 5
- 239000002131 composite material Substances 0.000 claims description 27
- 229920000139 polyethylene terephthalate Polymers 0.000 claims description 18
- 239000005020 polyethylene terephthalate Substances 0.000 claims description 18
- 239000003795 chemical substances by application Substances 0.000 claims description 16
- 229920001179 medium density polyethylene Polymers 0.000 claims description 4
- 239000004701 medium-density polyethylene Substances 0.000 claims description 4
- 229920001684 low density polyethylene Polymers 0.000 abstract description 5
- 239000004702 low-density polyethylene Substances 0.000 abstract description 5
- 238000004519 manufacturing process Methods 0.000 abstract description 3
- 239000008041 oiling agent Substances 0.000 abstract 3
- 239000004698 Polyethylene Substances 0.000 abstract 1
- 229920000573 polyethylene Polymers 0.000 abstract 1
- 239000000306 component Substances 0.000 description 68
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 17
- QQVIHTHCMHWDBS-UHFFFAOYSA-N isophthalic acid Chemical compound OC(=O)C1=CC=CC(C(O)=O)=C1 QQVIHTHCMHWDBS-UHFFFAOYSA-N 0.000 description 16
- 229920000642 polymer Polymers 0.000 description 16
- 229920001707 polybutylene terephthalate Polymers 0.000 description 14
- 229920001577 copolymer Polymers 0.000 description 9
- LYCAIKOWRPUZTN-UHFFFAOYSA-N Ethylene glycol Chemical compound OCCO LYCAIKOWRPUZTN-UHFFFAOYSA-N 0.000 description 6
- KKEYFWRCBNTPAC-UHFFFAOYSA-N Terephthalic acid Chemical compound OC(=O)C1=CC=C(C(O)=O)C=C1 KKEYFWRCBNTPAC-UHFFFAOYSA-N 0.000 description 6
- 239000002253 acid Substances 0.000 description 6
- 238000000034 method Methods 0.000 description 6
- 239000002202 Polyethylene glycol Substances 0.000 description 5
- MTHSVFCYNBDYFN-UHFFFAOYSA-N diethylene glycol Chemical compound OCCOCCO MTHSVFCYNBDYFN-UHFFFAOYSA-N 0.000 description 5
- 229920001223 polyethylene glycol Polymers 0.000 description 5
- 238000001816 cooling Methods 0.000 description 4
- 239000008358 core component Substances 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 239000000839 emulsion Substances 0.000 description 4
- QQVIHTHCMHWDBS-UHFFFAOYSA-L isophthalate(2-) Chemical compound [O-]C(=O)C1=CC=CC(C([O-])=O)=C1 QQVIHTHCMHWDBS-UHFFFAOYSA-L 0.000 description 4
- 238000002156 mixing Methods 0.000 description 4
- 150000001875 compounds Chemical class 0.000 description 3
- 239000000470 constituent Substances 0.000 description 3
- 150000002009 diols Chemical class 0.000 description 3
- 238000009826 distribution Methods 0.000 description 3
- 238000001035 drying Methods 0.000 description 3
- 238000009987 spinning Methods 0.000 description 3
- 229920001634 Copolyester Polymers 0.000 description 2
- WNLRTRBMVRJNCN-UHFFFAOYSA-N adipic acid Chemical compound OC(=O)CCCCC(O)=O WNLRTRBMVRJNCN-UHFFFAOYSA-N 0.000 description 2
- 230000000052 comparative effect Effects 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- BDJRBEYXGGNYIS-UHFFFAOYSA-N nonanedioic acid Chemical compound OC(=O)CCCCCCCC(O)=O BDJRBEYXGGNYIS-UHFFFAOYSA-N 0.000 description 2
- 229920002215 polytrimethylene terephthalate Polymers 0.000 description 2
- YPFDHNVEDLHUCE-UHFFFAOYSA-N propane-1,3-diol Chemical compound OCCCO YPFDHNVEDLHUCE-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
- RNFJDJUURJAICM-UHFFFAOYSA-N 2,2,4,4,6,6-hexaphenoxy-1,3,5-triaza-2$l^{5},4$l^{5},6$l^{5}-triphosphacyclohexa-1,3,5-triene Chemical compound N=1P(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP=1(OC=1C=CC=CC=1)OC1=CC=CC=C1 RNFJDJUURJAICM-UHFFFAOYSA-N 0.000 description 1
- ISPYQTSUDJAMAB-UHFFFAOYSA-N 2-chlorophenol Chemical compound OC1=CC=CC=C1Cl ISPYQTSUDJAMAB-UHFFFAOYSA-N 0.000 description 1
- 239000004593 Epoxy Substances 0.000 description 1
- UWHCKJMYHZGTIT-UHFFFAOYSA-N Tetraethylene glycol, Natural products OCCOCCOCCOCCO UWHCKJMYHZGTIT-UHFFFAOYSA-N 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 235000011037 adipic acid Nutrition 0.000 description 1
- 239000001361 adipic acid Substances 0.000 description 1
- 239000003242 anti bacterial agent Substances 0.000 description 1
- 239000003963 antioxidant agent Substances 0.000 description 1
- 230000003078 antioxidant effect Effects 0.000 description 1
- 239000002216 antistatic agent Substances 0.000 description 1
- 238000004581 coalescence Methods 0.000 description 1
- PDXRQENMIVHKPI-UHFFFAOYSA-N cyclohexane-1,1-diol Chemical compound OC1(O)CCCCC1 PDXRQENMIVHKPI-UHFFFAOYSA-N 0.000 description 1
- 125000000118 dimethyl group Chemical group [H]C([H])([H])* 0.000 description 1
- BWIIMRFKCNBWEH-UHFFFAOYSA-L dipotassium;octadecyl phosphate Chemical compound [K+].[K+].CCCCCCCCCCCCCCCCCCOP([O-])([O-])=O BWIIMRFKCNBWEH-UHFFFAOYSA-L 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 239000003063 flame retardant Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 230000001771 impaired effect Effects 0.000 description 1
- 238000004898 kneading Methods 0.000 description 1
- 239000004611 light stabiliser Substances 0.000 description 1
- 239000000314 lubricant Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
- 238000002074 melt spinning Methods 0.000 description 1
- 239000000178 monomer Substances 0.000 description 1
- 239000002667 nucleating agent Substances 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 239000000049 pigment Substances 0.000 description 1
- 239000004014 plasticizer Substances 0.000 description 1
- 229920000747 poly(lactic acid) Polymers 0.000 description 1
- 229920001610 polycaprolactone Polymers 0.000 description 1
- 239000004632 polycaprolactone Substances 0.000 description 1
- 239000004626 polylactic acid Substances 0.000 description 1
- 229920001296 polysiloxane Polymers 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
- 239000002904 solvent Substances 0.000 description 1
- 239000003381 stabilizer Substances 0.000 description 1
- ZIBGPFATKBEMQZ-UHFFFAOYSA-N triethylene glycol Chemical compound OCCOCCOCCO ZIBGPFATKBEMQZ-UHFFFAOYSA-N 0.000 description 1
- 239000006097 ultraviolet radiation absorber Substances 0.000 description 1
- 238000001291 vacuum drying Methods 0.000 description 1
- 125000000391 vinyl group Chemical group [H]C([*])=C([H])[H] 0.000 description 1
- 229920002554 vinyl polymer Polymers 0.000 description 1
- 238000009736 wetting Methods 0.000 description 1
Abstract
Description
本発明は湿式不織布用熱接着性複合繊維に関し、さらには、強力が高く、地合いの均一な不織布を製造できる湿式不織布用熱接着性複合繊維に関するものである。 The present invention relates to a heat-adhesive conjugate fiber for wet nonwoven fabrics, and further relates to a heat-adhesive conjugate fiber for wet nonwoven fabrics that can produce a nonwoven fabric having high strength and uniform texture.
従来、湿式不織布用熱接着繊維として、共重合ポリエステル系の複合繊維が広く用いられている。
例えば、結晶融点を持たない非晶性共重合ポリエステルを熱接着性成分とし、融点が２２０℃以上のポリアルキレンテレフタレートを繊維形成性成分とする湿式不織布用熱接着性複合繊維が提案されている（例えば、特許文献１参照。）。しかしながら、その出願において提案された湿式不織布用熱接着性複合繊維は、従来より接着性は改善されているものの、接着性はなお不十分であった。
Conventionally, copolyester composite fibers have been widely used as heat-bonding fibers for wet nonwoven fabrics.
For example, a heat-adhesive composite fiber for wet nonwoven fabrics has been proposed in which an amorphous copolyester having no crystalline melting point is used as a heat-adhesive component, and a polyalkylene terephthalate having a melting point of 220 ° C. or higher is used as a fiber-forming component ( For example, see Patent Document 1.) However, although the adhesiveness of the heat-adhesive conjugate fiber for wet nonwoven fabrics proposed in the application has been improved, the adhesiveness is still insufficient.
一方、融点が１５１℃の結晶性共重合ポリブチレンテレフタレート・イソフタレートを熱接着性成分とし、ポリエチレンテレフタレートを繊維形成性成分とするエアレイド不織布用の熱接着性複合繊維が提案されている（例えば、特許文献２参照。）。本出願において提案された複合繊維は、良好な接着性を示すものの、水中での分散性に劣るため、得られる湿式不織布の地合いは満足のいくものではなかった。 On the other hand, heat-adhesive conjugate fibers for airlaid nonwoven fabrics having a crystalline copolymer polybutylene terephthalate / isophthalate having a melting point of 151 ° C. as a heat-adhesive component and polyethylene terephthalate as a fiber-forming component have been proposed (for example, (See Patent Document 2). Although the conjugate fiber proposed in the present application shows good adhesiveness, it is inferior in dispersibility in water, so that the texture of the resulting wet nonwoven fabric is not satisfactory.
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、接着性が良好で、効率良く安定して、地合いの均一な不織布を製造できる湿式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 prior art, and its object is to provide a heat-adhesive conjugate fiber for wet nonwoven fabrics that can produce a nonwoven fabric with good adhesion, efficient and stable, and uniform texture. There is.
本発明者は、熱接着性成分を構成するポリマーの種類、熱接着性複合繊維の複合状態及び形状などが、主体繊維との接着性に大きく影響することに着目し、従来の湿式不織布用熱接着性複合繊維より接着性が向上し、同時に、効率良く品位の優れた湿式不織布が得られることを見出し、本発明に到達した。 The inventor of the present invention pays attention to the fact that the type of polymer constituting the heat-adhesive component, the composite state and shape of the heat-adhesive conjugate fiber greatly affect the adhesion to the main fiber, and the conventional heat for wet nonwoven fabrics. The inventors have found that a wet nonwoven fabric with improved adhesiveness and superior quality can be obtained at the same time as the adhesive conjugate fiber, and reached the present invention.
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る熱接着性複合繊維であり、融点が１３０〜２３０℃の範囲であるポリエステルを熱接着性成分とし、融点が２２０℃以上でなおかつ熱接着性成分の融点より２０℃以上高いポリアルキレンテレフタレートを繊維形成性成分とし、少なくとも該熱接着性成分が表面に露出するように両成分が複合化された熱接着性複合繊維であって、該熱接着性複合繊維表面に油剤が付着し、下記（１）〜（６）を満足していることを特徴とする熱接着性複合繊維が提供される。
（１）熱接着性成分に、ポリオレフィンが該熱接着性成分の重量を基準として０．５〜１５重量％含まれていること
（２）該ポリオレフィンがポリプロピレン、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ること
（３）熱接着性成分の熱接着性複合繊維に占める割合が４０〜９５重量％であること
（４）繊維長が２〜３０ｍｍであること
（５）油剤がポリエステル・ポリエーテル共重合体であること
（６）油剤付着率が熱接着性複合繊維に対して０．０１重量％以上であること
Thus, according to the present invention, a heat-adhesive conjugate fiber composed of a fiber-forming component and a heat-adhesive component, polyester having a melting point in the range of 130 to 230 ° C. as a heat-adhesive component, and a melting point of 220 ° C. A heat-adhesive composite fiber in which a polyalkylene terephthalate having a temperature higher than the melting point of the heat-adhesive component by 20 ° C. or more is used as a fiber-forming component, and both components are combined so that at least the heat-adhesive component is exposed on the surface. Then, an oil agent adheres to the surface of the heat-adhesive conjugate fiber, and the following (1) to (6) are satisfied, and a heat-adhesive conjugate fiber is provided.
(1) The thermal adhesive component contains 0.5 to 15% by weight of polyolefin based on the weight of the thermal adhesive component. (2) The polyolefin is polypropylene, high density polyethylene, medium density polyethylene, low It is a polyolefin obtained by copolymerizing styrene, acrylic acid, methacrylic acid or maleic acid with high density polyethylene or linear low density polyethylene. (3) The proportion of the thermal adhesive component in the thermal adhesive composite fiber is 40 to 95% by weight. (4) The fiber length is 2 to 30 mm. (5) The oil agent is a polyester / polyether copolymer. (6) The oil agent adhesion rate is 0.01% by weight with respect to the heat-adhesive conjugate fiber. That is more
本発明の熱接着性複合繊維は主体繊維との接着性が良好であるだけでなく、かかる複合繊維によれば、湿式不織布の地合いを均一なものとすることができる。このため、本発明の複合繊維からは、極めて高品質の不織布を製造することができる。 The heat-adhesive conjugate fiber of the present invention not only has good adhesion to the main fiber, but according to such conjugate fiber, the texture of the wet nonwoven fabric can be made uniform. For this reason, an extremely high quality nonwoven fabric can be produced from the conjugate fiber of the present invention.
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とからなり、融点が１３０〜２３０℃の範囲であるポリエステルを熱接着性成分とし、融点が２２０℃以上でなおかつ熱接着性成分のポリエステルの融点より２０℃以上高いポリアルキレンテレフタレートを繊維形成性成分とする熱接着性複合繊維である。上記熱接着性成分を主として構成するポリエステルは、融点が１３０〜２２０℃の範囲、好ましくは１５０〜２００℃の範囲であるポリエステルである。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重量％以上、より好ましくは７０重量％以上を構成することをいう。かかる熱接着性成分としては、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及びその共重合体、ポリブチレンテレフタレート及びその共重合体、ポリヘキサメチレンテレフタレート及びその共重合体又はポリ乳酸などが挙げられる。上記熱接着性成分の中でもジカルボン酸あるいはジオールを共重合した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ポリブチレンテレフタレートが好適である。 The heat-adhesive conjugate fiber of the present invention comprises a fiber-forming component and a heat-adhesive component, and a polyester having a melting point in the range of 130 to 230 ° C. is used as the heat-adhesive component. It is a heat-adhesive conjugate fiber having a polyalkylene terephthalate that is 20 ° C. or higher than the melting point of the component polyester as a fiber-forming component. The polyester mainly constituting the thermal adhesive component is a polyester having a melting point in the range of 130 to 220 ° C, preferably in the range of 150 to 200 ° C. Here, “mainly composed” means that it constitutes 60% by weight or more, preferably 65% by weight or more, more preferably 70% by weight or more of the thermal adhesive component. Such heat-adhesive components include polyethylene terephthalate, polytrimethylene terephthalate and copolymers thereof copolymerized with dicarboxylic acid or diol as the third component, polybutylene terephthalate and copolymers thereof, polyhexamethylene terephthalate and copolymers thereof. Examples include coalescence or polylactic acid. Among the above thermal adhesive components, polyethylene terephthalate copolymerized with dicarboxylic acid or diol and polybutylene terephthalate copolymerized with dicarboxylic acid or diol are preferred.
上記共重合ポリエチレンテレフタレートは、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％共重合したものが熱接着性の点で特に好ましい。また、上記共重合ポリブチレンテレフタレートは、イソフタル酸を共重合ポリブチレンテレフタレートの酸成分のモル数を基準として５〜４０モル％、より好ましくは５〜３５モル％共重合したものが熱接着性の点で特に好ましい。なお、上記の共重合ポリエチレンテレフタレート及び共重合ポリブチレンテレフタレートには、熱接着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、トリエチレングリコール、テトラエチレングリコール、シクロヘキサンジオール、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 is particularly preferable from the viewpoint of thermal adhesiveness in which isophthalic acid is copolymerized in an amount of 5 to 30 mol%, more preferably 5 to 25 mol% based on the acid component. The copolymerized polybutylene terephthalate is obtained by copolymerizing 5 to 40 mol%, more preferably 5 to 35 mol% of isophthalic acid based on the number of moles of the acid component of the copolymerized polybutylene terephthalate. Particularly preferred in terms. The above-mentioned copolymerized polyethylene terephthalate and copolymerized polybutylene terephthalate include sodium 5-sulfoisophthalate, adipic acid, sebacic acid, azelaic acid, polycaprolactone, and diethylene glycol as long as thermal adhesion and other physical properties are not impaired. Or trimethylene glycol, triethylene glycol, tetraethylene glycol, cyclohexanediol, polyethylene glycol, or the like may be copolymerized.
本発明の繊維形成性成分を構成するポリアルキレンテレフタレートは、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。また、上記繊維形成性成分の融点は上記熱接着性成分の融点より２０℃以上、好ましくは３０℃以上、より好ましくは４０〜１５０℃高い必要がある。 The polyalkylene terephthalate constituting the fiber-forming component of the present invention 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 of the heat-adhesive component is too large, the spinnability tends to decrease, and the melting point of the fiber-forming component is preferably in the range of 220 to 300 ° C, more preferably. Is in the range of 225-280 ° C. The melting point of the fiber-forming component needs to be 20 ° C. or higher, preferably 30 ° C. or higher, more preferably 40 to 150 ° C. higher than the melting point of the thermal adhesive component.
さらに上記繊維形成性成分を構成する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、融点及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。上記の熱接着性成分及び繊維形成性成分に使用されるポリマーには、本発明の効果を妨げない範囲でさらに、酸化防止剤、光安定剤、紫外線吸収剤、中和剤、造核剤、エポキシ安定剤、滑剤、抗菌剤、難燃剤、帯電防止剤、顔料、可塑剤などの添加剤が必要に応じて含有されていてもよい。 Furthermore, examples of the polyalkylene terephthalate constituting the fiber-forming component include polyethylene terephthalate, polytrimethylene terephthalate, and polybutylene terephthalate. Among them, polyethylene terephthalate has a melting point and high rigidity when used as a composite fiber. preferable. The polymer used for the above-mentioned heat-adhesive component and fiber-forming component further includes an antioxidant, a light stabilizer, an ultraviolet absorber, a neutralizer, a nucleating agent, as long as the effects of the present invention are not hindered. Additives such as an epoxy stabilizer, a lubricant, an antibacterial agent, a flame retardant, an antistatic agent, a pigment, and a plasticizer may be contained as necessary.
本発明の複合繊維は、少なくとも熱接着性成分が該繊維の表面に露出している複合繊維であり、熱接着性成分と繊維形成性成分が並列型に複合化されたもの（サイドバイサイド型）、熱接着性成分を鞘成分とし繊維形成性成分を芯成分とし、両成分が同芯鞘芯型又は偏芯鞘芯型に複合化された複合繊維であることが好ましい。本発明の熱接着性複合繊維においては、熱接着性成分の該熱接着性複合繊維表面に占める割合が小さくても高い接着力を示すが、主体繊維を均一に濡らすことができる点で鞘芯型に複合化させるのが特に好ましい。また本発明の複合繊維は、湿式不織布を製造する際の複合繊維の水への分散性の観点から複合繊維表面に油剤が付着していることを必要とする。 The composite fiber of the present invention is a composite fiber in which at least the heat-adhesive component is exposed on the surface of the fiber, and the heat-adhesive component and the fiber-forming component are combined in a parallel type (side-by-side type), It is preferable that the heat-adhesive component is a sheath component, the fiber-forming component is a core component, and both components are composite fibers that are combined into a concentric sheath-core type or an eccentric sheath-core type. The heat-adhesive conjugate fiber of the present invention shows a high adhesive force even if the proportion of the heat-adhesive component on the surface of the heat-adhesive conjugate fiber is small, but the sheath core is capable of uniformly wetting the main fiber. It is particularly preferred to make it a composite. Moreover, the composite fiber of this invention requires that the oil agent has adhered to the composite fiber surface from the viewpoint of the dispersibility to the water of the composite fiber at the time of manufacturing a wet nonwoven fabric.
本発明においては、前述の複合繊維が前述した（１）〜（６）の要件を同時に満足していることが肝要である。これにより、上記各要件の奏する効果があいまって、主体繊維との接着性を良好とすることと、効率良く地合いの均一な湿式不織布を製造することの両方の課題を同時に達成することができる。 In the present invention, it is important that the above-mentioned composite fiber simultaneously satisfies the requirements (1) to (6) described above. Thereby, the effect which said requirements show | plays together, and the subject of making favorable adhesiveness with a main fiber and manufacturing a wet nonwoven fabric with a uniform texture efficiently can be achieved simultaneously.
以下、上記（１）〜（６）の各要件について説明する。まず、本発明においては、（１）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、繊維−繊維間の摩擦が高くなりやすく、水中での分散性が低下することがあるため、熱接着性成分に、ポリオレフィンが該成分の重量を基準として０．５〜１５重量％含まれている必要がある。これにより湿式不織布中の結束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としては、（２）にあるようにポリプロピレン、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、マレイン酸など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、不織布にしたときの結束状欠点を減少させる効果が大きいため、より好ましい。即ち本願発明のビニルモノマーを共重合した変性ポリオレフィンの具体例としては、スチレン、アクリル酸、メタクリル酸若しくはマレイン酸などを共重合したポリプロピレン；スチレン、アクリル酸、メタクリル酸若しくはマレイン酸などを共重合した高密度ポリエチレン；スチレン、アクリル酸、メタクリル酸若しくはマレイン酸などを共重合した中密度ポリエチレン；スチレン、アクリル酸、メタクリル酸若しくはマレイン酸などを共重合した低密度ポリエチレン；又はスチレン、アクリル酸、メタクリル酸若しくはマレイン酸などを共重合した線状低密度ポリエチレンを挙げることができる。また、ポリオレフィンの熱接着性成分への混合率が０．５重量％未満であると不織布上の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やすくなる傾向にある。ポリオレフィンの混合率は、より好ましくは１．０〜１０重量％の範囲である。 Hereinafter, each requirement of said (1)-(6) is demonstrated. First, in the present invention, (1) when the copolymer polyethylene terephthalate and copolymer polybutylene terephthalate as described above are used as a polymer mainly comprising a heat-adhesive component, the fiber-to-fiber friction tends to be high, Since dispersibility in water may be lowered, it is necessary that the thermal adhesive component contains 0.5 to 15% by weight of polyolefin based on the weight of the component. Thereby, the bundling fault in a wet nonwoven fabric can be reduced significantly. Examples of the polyolefin include polypropylene, high-density polyethylene, medium-density polyethylene, low-density polyethylene, or linear low-density polyethylene copolymerized with styrene, acrylic acid, methacrylic acid, maleic acid, etc. as in (2). As examples, maleic acid copolymerized polyolefins are more preferable because they have good compatibility with polyesters and have a large effect of reducing the bundled defects when made into a nonwoven fabric. That is, specific examples of the modified polyolefin copolymerized with the vinyl monomer of the present invention include polypropylene copolymerized with styrene, acrylic acid, methacrylic acid or maleic acid; copolymerized with styrene, acrylic acid, methacrylic acid or maleic acid or the like. High density polyethylene; medium density polyethylene copolymerized with styrene, acrylic acid, methacrylic acid or maleic acid; low density polyethylene copolymerized with styrene, acrylic acid, methacrylic acid or maleic acid; or styrene, acrylic acid, methacrylic acid Alternatively, linear low density polyethylene obtained by copolymerizing maleic acid can be used. Further, if the mixing ratio of polyolefin to the heat-adhesive component is less than 0.5% by weight, the effect of reducing defects on the nonwoven fabric is reduced, and if it exceeds 15% by weight, yarn breakage tends to occur during spinning. It is in. The mixing ratio of the polyolefin is more preferably in the range of 1.0 to 10% by weight.
次に、（３）熱接着性成分の複合繊維に占める割合を４０〜９５重量％とする必要がある。４０重量％未満では、主体繊維の表面を十分濡らすだけのポリマー量がないため、該主体繊維との熱接着性が不十分となり、十分な強力の湿式不織布が得られない。９５重量％を超えると、複合繊維の安定した溶融紡糸が困難となる。上記割合としては４５〜９０重量％の範囲が好ましく、より好ましくは５０〜８０重量％の範囲である。これら（１）、（３）の配合に関する要件は熱接着性成分とポリオレフィンの混合・混練率の調整、複合繊維を紡糸する際に繊維形成性成分と熱接着性成分の吐出量の調整によって当業者であれば容易に実現することができる。 Next, (3) the proportion of the thermal adhesive component in the composite fiber needs to be 40 to 95% by weight. If it is less than 40% by weight, the amount of polymer sufficient to sufficiently wet the surface of the main fiber is not sufficient, so that the thermal adhesiveness with the main fiber becomes insufficient and a sufficiently strong wet nonwoven fabric cannot be obtained. If it exceeds 95% by weight, stable melt spinning of the composite fiber becomes difficult. As said ratio, the range of 45 to 90 weight% is preferable, More preferably, it is the range of 50 to 80 weight%. The requirements for blending (1) and (3) are met by adjusting the mixing / kneading rate of the thermal adhesive component and polyolefin, and adjusting the discharge rate of the fiber-forming component and thermal adhesive component when spinning the composite fiber. It can be easily realized by a trader.
さらに（４）繊維長は、２〜３０ｍｍとする必要がある。繊維長が２ｍｍを下回ると、主体繊維を強固に接着させるためのネットワークが形成しにくくなり、一方、繊維長が３０ｍｍを超えると、抄紙の際に十分な分散性が得られず、好ましくない。繊維長としては、３〜２０ｍｍがより好ましい。 Furthermore, (4) fiber length needs to be 2-30 mm. When the fiber length is less than 2 mm, it is difficult to form a network for firmly bonding the main fibers. On the other hand, when the fiber length exceeds 30 mm, sufficient dispersibility cannot be obtained during papermaking, which is not preferable. The fiber length is more preferably 3 to 20 mm.
また、（５）本発明の複合繊維に使用する油剤は、親水性の高くポリエステルとも親和性のあるポリエステル・ポリエーテル共重合体を主たる構成成分とする必要がある。ポリエステル・ポリエーテル共重合体以外の油剤を使用すると、抄紙の際に十分な分散性が得られず、好ましくない。また、本発明の複合繊維には油剤が付着しており、（６）油剤付着率を０．０１重量％以上とする必要がある。油剤付着率が０．０１重量％を下回ると、抄紙の際に十分な分散性が得られず、好ましくない。抄紙の際には水中に複合繊維を分散させることが一般に採用されるので、水への分散性を考慮してポリエーテル部分には主にポリエチレングリコール、ポリオキシエチレン単位を有することが好ましい。油剤付着率としては、０．１重量％以上がより好ましい。油剤付着率は油剤を含まない熱接着性複合繊維の重量を基準として油剤の固形成分の重量率を持って表すことが一般に採用されている。本発明の複合繊維の繊度は特に限定されないが、０．１〜３デシテックスの範囲が主体繊維との熱接着性をより強固にでき好ましい。特に繊度を細くすればするほど構成本数を多くでき、得られる湿式不織布の強力が高くなるため有利である。紡糸延伸条件の調整によって繊度の調整は行うことができる。 (5) The oil agent used for the composite fiber of the present invention is required to have a polyester / polyether copolymer having a high hydrophilicity and an affinity for polyester as a main component. Use of an oil agent other than the polyester / polyether copolymer is not preferable because sufficient dispersibility cannot be obtained during papermaking. Moreover, the oil agent has adhered to the composite fiber of this invention, (6) Oil agent adhesion rate needs to be 0.01 weight% or more. When the oil agent adhesion rate is less than 0.01% by weight, sufficient dispersibility cannot be obtained during papermaking, which is not preferable. In general, it is preferable to disperse the composite fiber in water at the time of papermaking. Therefore, it is preferable that the polyether portion mainly has polyethylene glycol and polyoxyethylene units in consideration of dispersibility in water. As an oil agent adhesion rate, 0.1 weight% or more is more preferable. It is generally adopted that the oil agent adhesion rate is expressed with the weight ratio of the solid component of the oil agent based on the weight of the heat-adhesive conjugate fiber not containing the oil agent. The fineness of the composite fiber of the present invention is not particularly limited, but a range of 0.1 to 3 dtex is preferable because it can further strengthen the thermal adhesiveness with the main fiber. In particular, the finer the fineness, the more the number of components can be increased, and the strength of the resulting wet nonwoven fabric is increased, which is advantageous. The fineness can be adjusted by adjusting the spinning and drawing conditions.
本発明の複合繊維を主体繊維と混綿して用いる場合、該複合繊維が湿式不織布中に３〜３０重量％程度含まれるようにすれば、十分な接着性能を発揮できる。 When the composite fiber of the present invention is mixed with the main fiber and used, if the composite fiber is contained in the wet nonwoven fabric in an amount of about 3 to 30% by weight, sufficient adhesive performance can be exhibited.
以下、実施例により、本発明をさらに具体的に説明するが、本発明はこれらの実施例に限定されるものではない。なお、実施例における各項目は次の方法で測定した。
（１）繊度
ＪＩＳ Ｌ １０１５ ７．５．１ Ａ法に記載の方法により測定した。
（２）繊維長
ＪＩＳ Ｌ １０１５ ７．４．１ Ｃ法に記載の方法により測定した。
（３）固有粘度（［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。
（４）メルトフローレイト（ＭＦＲ）
ＪＩＳ Ｋ ７２１０ に記載の方法により測定した。
（５）融点（Ｔｍ）
パーキンエルマー社製の示差走査熱量計ＤＳＣ−７型を使用し、昇温速度２０℃／分で測定した。
（６）シートの引張り強さ及び地合い
熊谷理機工業株式会社製角型シートマシンを使って、熱接着性複合繊維５０％と主体繊維５０％とを水中でよく撹拌、混合して分散させ、大きさが約２５ｃｍ×約２５ｃｍで、目付けが約５０ｇ／ｃｍ２のシートを作製する。該シートを濾紙の間に挟んで、熊谷理機工業株式会社製の高温用回転型乾燥機を使って表面温度１６０℃の条件で、熱処理を行う。この熱処理されたシートを、ＪＩＳ Ｐ８１１３に従って引張り強さを測定し、裂断長で表した。熱処理されたシートについては下記の判定基準で地合いの良否も目視で判定した。
地合い○：構成繊維の分布が均一であり、斑が非常に少ない。
地合い△：構成繊維の分布がやや不均一であり、斑がやや目立つ。
地合い×：構成繊維の分布が非常に不均一であり、斑が目立つ。
EXAMPLES Hereinafter, the present invention will be described more specifically with reference to examples, but the present invention is not limited to these examples. In addition, each item in an Example was measured with the following method.
(1) Fineness Measured by the method described in JIS L 1015 7.5.1 Method A.
(2) Fiber length Measured by the method described in JIS L 1015 7.4.1 C method.
(3) Intrinsic viscosity ([η])
Measurement was performed at a temperature of 35 ° C. using orthochlorophenol as a solvent.
(4) Melt flow rate (MFR)
It was measured by the method described in JIS K 7210.
(5) Melting point (Tm)
A differential scanning calorimeter DSC-7 manufactured by Perkin Elmer was used, and the temperature was increased at a rate of 20 ° C./min.
(6) Tensile strength and texture of sheet Using a square sheet machine manufactured by Kumagai Riki Kogyo Co., Ltd., 50% heat-adhesive conjugate fiber and 50% main fiber are thoroughly stirred, mixed and dispersed in water. A sheet having a size of about 25 cm × about 25 cm and a basis weight of about 50 g / cm 2 is produced. The sheet is sandwiched between filter papers, and heat treatment is performed at a surface temperature of 160 ° C. using a high-temperature rotary dryer manufactured by Kumagai Riki Kogyo Co., Ltd. The tensile strength of this heat-treated sheet was measured according to JIS P8113 and expressed in terms of tear length. About the heat-processed sheet | seat, the quality of the texture was also determined visually by the following criteria.
Texture ○: The distribution of the constituent fibers is uniform, and there are very few spots.
Texture Δ: The distribution of the constituent fibers is slightly non-uniform, and the spots are slightly noticeable.
Texture x: The distribution of the constituent fibers is very uneven and the spots are conspicuous.
［参考例１］
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）のチップをエクストルーダーで溶融し、２８０℃の溶融ポリマー（繊維形成性成分）とした。溶融ポリマーを、直径０．３ｍｍの丸穴キャピラリーを１３０５孔有する紡糸口金から溶融吐出させた。この際、口金温度は２８０℃、吐出量は７２０ｇ／分であった。さらに吐出ポリマーを３０℃の冷却風で冷却し、１２００ｍ／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、酸成分がモル比でテレフタル酸が８０％、イソフタル酸が２０％と数平均分子量３０００のポリエチレングリコール７０重量％とを共重合した数平均分子量が約１００００のポリエーテル・ポリエステル共重合体のエマルジョン（濃度２％）を通過させ、約１２％の水分率になるように絞った後、１３０℃で乾燥した後、５ｍｍの繊維長にカットした。得られた短繊維の繊度は１．７デシテックスであった。
[Reference Example 1]
A polyethylene terephthalate (PET) chip having an intrinsic viscosity [η] of 0.61 and a Tm of 256 ° C., which was vacuum-dried at 120 ° C. for 16 hours, was melted with an extruder to obtain a molten polymer (fiber-forming component) at 280 ° C. . The molten polymer was melt-discharged from a spinneret having 1305 round-hole capillaries having a diameter of 0.3 mm. At this time, the die temperature was 280 ° C., and the discharge rate was 720 g / min. Further, the discharged polymer was cooled with a cooling air of 30 ° C. and wound at 1200 m / min to obtain an undrawn yarn. This unstretched 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 the acid component was 80% terephthalic acid in a molar ratio and isophthalic acid. Is passed through an emulsion (concentration 2%) of a polyether-polyester copolymer having a number average molecular weight of about 10,000, which is obtained by copolymerizing 20% with 70% by weight of polyethylene glycol having a number average molecular weight of 3000 and a water content of about 12%. And then dried at 130 ° C. and cut to a fiber length of 5 mm. The fineness of the obtained short fiber was 1.7 dtex.
［実施例１］
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（ＰＢＴ）・イソフタレート（ｃｏ−ＰＢＴ；イソフタル酸２５モル％、エチレングリコール３５モル％共重合されたポリブチレンテレフタレート）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℃）のチップを９５：５の重量割合で混合し、これを二軸エクストルーダーで溶融し、２５５℃の溶融混合ポリマー（熱接着性成分）とした。一方、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）のチップをエクストルーダーで溶融し、２８０℃の溶融ポリマー（繊維形成性成分）とした。両溶融ポリマーを、前者を鞘成分Ａ、後者を芯成分Ｂとし、かつ重量比がＡ：Ｂ＝５０：５０となるように、直径０．３ｍｍの丸穴キャピラリーを１０３２孔有する公知の芯鞘型複合紡糸口金から、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３０℃の冷却風で冷却し、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、酸成分がモル比でテレフタル酸が８０％、イソフタル酸が２０％と数平均分子量３０００のポリエチレングリコール７０重量％とを共重合した数平均分子量が約１００００のポリエーテル・ポリエステル共重合体のエマルジョン（濃度２％）を通過させ、約１２％の水分率になるように絞った後、乾燥せずに、５ｍｍの繊維長にカットした。ポリエーテル・ポリエステル共重合体の油剤の付着率は０．２４％であった。得られた短繊維の繊度は２．１デシテックスであった。得られた繊維と参考例１で作製した主体繊維を使用して作製したシートの引張り強さと地合いを表１に示した。
[Example 1]
Copolymerized polybutylene terephthalate (PBT) / isophthalate (co-PBT; co-PBT; isophthalic acid 25 mol%, ethylene glycol 35 mol%) having an intrinsic viscosity [η] of 0.55 and Tm of 151 ° C., which was vacuum-dried at 80 ° C. for 24 hours Copolymerized polybutylene terephthalate) and low density polyethylene (MFR 8 g / 10 min, Tm 98 ° C.) copolymerized with 0.5% by weight of maleic acid were mixed at a weight ratio of 95: 5, and this was mixed biaxially. It was melted with an extruder to obtain a melt mixed polymer (thermal adhesive component) at 255 ° C. On the other hand, polyethylene terephthalate (PET) chips having an intrinsic viscosity [η] of 0.61 and Tm of 256 ° C., which were vacuum-dried at 120 ° C. for 16 hours, were melted with an extruder and melted at 280 ° C. (fiber-forming component). It was. A known core sheath having both molten polymers, the sheath component A being the former, the core component B being the latter, and 1032 round hole capillaries with a diameter of 0.3 mm so that the weight ratio is A: B = 50: 50 The composite compound spinneret was 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 cooled with 30 ° C. cooling air and wound at 1100 m / min to obtain an undrawn yarn. This unstretched 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 the acid component was 80% terephthalic acid in a molar ratio and isophthalic acid. Is passed through an emulsion (concentration 2%) of a polyether-polyester copolymer having a number average molecular weight of about 10,000, which is obtained by copolymerizing 20% with 70% by weight of polyethylene glycol having a number average molecular weight of 3000 and a water content of about 12%. After being squeezed to be 5 mm, it was cut to a fiber length of 5 mm without drying. The adhesion ratio of the polyether / polyester copolymer oil was 0.24%. The fineness of the obtained short fiber was 2.1 dtex. Table 1 shows the tensile strength and texture of the sheet produced using the obtained fiber and the main fiber produced in Reference Example 1.
［比較例１］
３５℃で４８時間真空乾燥した固有粘度［η］が０．５７、Ｔｍを示さない共重合ポリエチレンテレフタレート・イソフタレート（ｃｏＰＥＴ；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）を二軸エクストルーダーで溶融し、２５０℃の溶融ポリマー（熱接着性成分）とした。一方、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）のチップをエクストルーダーで溶融し、２８０℃の溶融ポリマー（繊維形成性成分）とした。両溶融ポリマーを、前者を鞘成分Ａ、後者を芯成分Ｂとし、かつ重量比がＡ：Ｂ＝５０：５０となるように、直径０．３ｍｍの丸穴キャピラリーを１０３２孔有する公知の芯鞘型複合紡糸口金から、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３０℃の冷却風で冷却し、１１００ｍ／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、酸成分がモル比でテレフタル酸が８０％、イソフタル酸が２０％と数平均分子量３０００のポリエチレングリコール７０重量％とを共重合した数平均分子量が約１００００のポリエーテル・ポリエステル共重合体のエマルジョン（濃度２％）を通過させ、約１２％の水分率になるように絞った後、乾燥せずに、５ｍｍの繊維長にカットした。得られた短繊維の繊度は２．１デシテックスであった。得られた繊維と参考例１で作製した主体繊維を使用して作製したシートの引張り強さと地合いを表１に示した。
[Comparative Example 1]
Biaxial extruder of copolymerized polyethylene terephthalate / isophthalate (coPET; 30 mol% isophthalic acid, 4 mol% diethylene glycol copolymer) that has an intrinsic viscosity [η] of 0.57 and does not show Tm after vacuum drying at 35 ° C for 48 hours To obtain a molten polymer (thermal adhesive component) at 250 ° C. On the other hand, polyethylene terephthalate (PET) chips having an intrinsic viscosity [η] of 0.61 and Tm of 256 ° C., which was vacuum-dried at 120 ° C. for 16 hours, were melted with an extruder and melted at 280 ° C. (fiber-forming component). It was. A known core sheath having both molten polymers, the sheath component A being the former, the core component B being the latter, and 1032 round hole capillaries with a diameter of 0.3 mm so that the weight ratio is A: B = 50: 50 The composite compound spinneret was 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 cooled with 30 ° C. cooling air and wound at 1100 m / min to obtain an undrawn yarn. This unstretched yarn was stretched 3.1 times in warm water at 55 ° C. and subsequently stretched 1.15 times in warm water at 50 ° C., and then the acid component was 80% terephthalic acid in a molar ratio, isophthalic acid Is passed through an emulsion (concentration 2%) of a polyether-polyester copolymer having a number average molecular weight of about 10,000, which is obtained by copolymerizing 20% with 70% by weight of polyethylene glycol having a number average molecular weight of 3000 and a water content of about 12%. After being squeezed to be 5 mm, it was cut to a fiber length of 5 mm without drying. The fineness of the obtained short fiber was 2.1 dtex. Table 1 shows the tensile strength and texture of the sheet produced using the obtained fiber and the main fiber produced in Reference Example 1.
［比較例２］
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℃）のチップを９５：５の割合で混合し、これを二軸エクストルーダーで溶融し、２５５℃の溶融混合ポリマー（熱接着性成分）とした。一方、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）のチップをエクストルーダーで溶融し、２８０℃の溶融ポリマー（繊維形成性成分）とした。両溶融ポリマーを、前者を鞘成分Ａ、後者を芯成分Ｂとし、かつ重量比がＡ：Ｂ＝５０：５０となるように、直径０．３ｍｍの丸穴キャピラリーを１０３２孔有する公知の芯鞘型複合紡糸口金から、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３０℃の冷却風で冷却し、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）からなる油剤のエマルジョン（濃度２％）を通過させ、約１２％の水分率になるように絞った後、乾燥せずに、５ｍｍの繊維長にカットした。得られた短繊維の繊度は２．１デシテックスであった。得られた繊維と参考例１で作製した主体繊維を使用して作製したシートの引張り強さと地合いを表１に示した。
[Comparative Example 2]
Copolymer polybutylene terephthalate / isophthalate (coPBT; copolymer of 25 mol% isophthalic acid, 35 mol% ethylene glycol) and maleic having an intrinsic viscosity [η] of 0.55 and Tm of 151 ° C., which was vacuum-dried at 80 ° C. for 24 hours Chips of low density polyethylene (MFR 8 g / 10 min, Tm 98 ° C.) copolymerized with 0.5% by weight of acid were mixed at a ratio of 95: 5, melted with a twin screw extruder, and melt mixed at 255 ° C. A polymer (thermal adhesive component) was used. On the other hand, polyethylene terephthalate (PET) chips having an intrinsic viscosity [η] of 0.61 and Tm of 256 ° C., which was vacuum-dried at 120 ° C. for 16 hours, were melted with an extruder and melted at 280 ° C. (fiber-forming component). It was. A known core sheath having both molten polymers, the sheath component A being the former, the core component B being the latter, and 1032 round hole capillaries with a diameter of 0.3 mm so that the weight ratio is A: B = 50: 50 The composite compound spinneret was 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 cooled with 30 ° C. cooling air and wound at 1100 m / min to obtain an undrawn yarn. This unstretched yarn was stretched 3.1 times in warm water at 70 ° C. and then stretched 1.15 times in warm water at 90 ° C., and then stearyl phosphate potassium salt / dimethyl silicone = 65/35 (weight ratio) ) Was passed through an oil emulsion (concentration: 2%), squeezed to a moisture content of about 12%, and then cut to a fiber length of 5 mm without drying. The fineness of the obtained short fiber was 2.1 dtex. Table 1 shows the tensile strength and texture of the sheet produced using the obtained fiber and the main fiber produced in Reference Example 1.
本発明の熱接着性複合繊維は主体繊維との接着性が良好であるだけでなく、かかる熱接着性複合繊維によれば、湿式不織布の地合いを均一なものとすることができる。このため、本発明の複合繊維からは、極めて高品質の不織布を製造することができる。そのためそのようにして得られた不織布はフィルターなど濾過機能を要求される用途に好ましく用いることができる。 The heat-adhesive conjugate fiber of the present invention not only has good adhesion to the main fiber, but according to the heat-adhesive conjugate fiber, the texture of the wet nonwoven fabric can be made uniform. For this reason, an extremely high quality nonwoven fabric can be produced from the conjugate fiber of the present invention. Therefore, the nonwoven fabric thus obtained can be preferably used for applications that require a filtering function such as a filter.
Claims (3)
（１）熱接着性成分に、ポリオレフィンが該熱接着性成分の重量を基準として０．５〜１５重量％含まれていること
（２）該ポリオレフィンがポリプロピレン、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ること
（３）熱接着性成分の熱接着性複合繊維に占める割合が４０〜９５重量％であること
（４）繊維長が２〜３０ｍｍであること
（５）油剤がポリエステル・ポリエーテル共重合体であること
（６）油剤付着率が熱接着性複合繊維に対して０．０１重量％以上であること A heat-adhesive conjugate fiber composed of a fiber-forming component and a heat-adhesive component, and a polyester having a melting point in the range of 130 to 230 ° C. as a heat-adhesive component, having a melting point of 220 ° C. or higher and A heat-adhesive conjugate fiber in which a polyalkylene terephthalate having a temperature higher than the melting point by 20 ° C. or more is used as a fiber-forming component, and both components are combined so that at least the heat-adhesive component is exposed on the surface. An oily agent adheres to the fiber surface and satisfies the following (1) to (6).
(1) The thermal adhesive component contains 0.5 to 15% by weight of polyolefin based on the weight of the thermal adhesive component. (2) The polyolefin is polypropylene, high density polyethylene, medium density polyethylene, low It is a polyolefin obtained by copolymerizing styrene, acrylic acid, methacrylic acid or maleic acid with high density polyethylene or linear low density polyethylene. (3) The proportion of the thermal adhesive component in the thermal adhesive composite fiber is 40 to 95% by weight. (4) The fiber length is 2 to 30 mm. (5) The oil agent is a polyester / polyether copolymer. (6) The oil agent adhesion rate is 0.01% by weight with respect to the heat-adhesive conjugate fiber. That is more
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| JP2014201855A (en) * | 2013-04-05 | 2014-10-27 | 帝人株式会社 | Heat-adhesive composite fiber |
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