EP3375918B1 - Core-sheath composite cross-section fiber having excellent moisture absorbency and wrinkle prevention - Google Patents
Core-sheath composite cross-section fiber having excellent moisture absorbency and wrinkle prevention Download PDFInfo
- Publication number
- EP3375918B1 EP3375918B1 EP16864073.8A EP16864073A EP3375918B1 EP 3375918 B1 EP3375918 B1 EP 3375918B1 EP 16864073 A EP16864073 A EP 16864073A EP 3375918 B1 EP3375918 B1 EP 3375918B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- core
- fiber
- section
- sheath
- composite cross
- Prior art date
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- 239000000835 fiber Substances 0.000 title claims description 172
- 239000002131 composite material Substances 0.000 title claims description 96
- 230000037330 wrinkle prevention Effects 0.000 title description 38
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 62
- 238000005406 washing Methods 0.000 claims description 53
- 239000004952 Polyamide Substances 0.000 claims description 50
- 229920002647 polyamide Polymers 0.000 claims description 50
- 230000014759 maintenance of location Effects 0.000 claims description 49
- 229920000642 polymer Polymers 0.000 claims description 34
- 239000013078 crystal Substances 0.000 claims description 33
- 229920006146 polyetheresteramide block copolymer Polymers 0.000 claims description 30
- 238000009835 boiling Methods 0.000 claims description 25
- 239000004744 fabric Substances 0.000 claims description 18
- 238000009864 tensile test Methods 0.000 claims description 14
- 229920001169 thermoplastic Polymers 0.000 claims description 14
- CXMXRPHRNRROMY-UHFFFAOYSA-N sebacic acid group Chemical group C(CCCCCCCCC(=O)O)(=O)O CXMXRPHRNRROMY-UHFFFAOYSA-N 0.000 claims description 12
- 125000001142 dicarboxylic acid group Chemical group 0.000 claims description 8
- 239000004753 textile Substances 0.000 claims description 4
- 229920000305 Nylon 6,10 Polymers 0.000 description 27
- 239000002759 woven fabric Substances 0.000 description 27
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 26
- 238000005461 lubrication Methods 0.000 description 20
- 238000009998 heat setting Methods 0.000 description 17
- LYCAIKOWRPUZTN-UHFFFAOYSA-N Ethylene glycol Chemical compound OCCO LYCAIKOWRPUZTN-UHFFFAOYSA-N 0.000 description 16
- 239000000306 component Substances 0.000 description 16
- 238000000034 method Methods 0.000 description 16
- -1 polypentamethylene sebacamide Polymers 0.000 description 14
- 230000000052 comparative effect Effects 0.000 description 12
- 238000002425 crystallisation Methods 0.000 description 12
- 230000008025 crystallization Effects 0.000 description 12
- 238000004804 winding Methods 0.000 description 12
- 238000004043 dyeing Methods 0.000 description 11
- 238000009987 spinning Methods 0.000 description 11
- 230000007423 decrease Effects 0.000 description 10
- 238000010438 heat treatment Methods 0.000 description 10
- WGCNASOHLSPBMP-UHFFFAOYSA-N hydroxyacetaldehyde Natural products OCC=O WGCNASOHLSPBMP-UHFFFAOYSA-N 0.000 description 8
- 238000001069 Raman spectroscopy Methods 0.000 description 7
- 238000005259 measurement Methods 0.000 description 7
- 238000012545 processing Methods 0.000 description 7
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- 239000000203 mixture Substances 0.000 description 6
- 230000010287 polarization Effects 0.000 description 6
- ISPYQTSUDJAMAB-UHFFFAOYSA-N 2-chlorophenol Chemical compound OC1=CC=CC=C1Cl ISPYQTSUDJAMAB-UHFFFAOYSA-N 0.000 description 5
- 229920002292 Nylon 6 Polymers 0.000 description 5
- 238000011156 evaluation Methods 0.000 description 5
- 239000008188 pellet Substances 0.000 description 5
- 229920000233 poly(alkylene oxides) Polymers 0.000 description 5
- KKEYFWRCBNTPAC-UHFFFAOYSA-N Terephthalic acid Chemical compound OC(=O)C1=CC=C(C(O)=O)C=C1 KKEYFWRCBNTPAC-UHFFFAOYSA-N 0.000 description 4
- 239000000654 additive Substances 0.000 description 4
- WNLRTRBMVRJNCN-UHFFFAOYSA-N adipic acid Chemical compound OC(=O)CCCCC(O)=O WNLRTRBMVRJNCN-UHFFFAOYSA-N 0.000 description 4
- 238000001816 cooling Methods 0.000 description 4
- POULHZVOKOAJMA-UHFFFAOYSA-N dodecanoic acid Chemical compound CCCCCCCCCCCC(O)=O POULHZVOKOAJMA-UHFFFAOYSA-N 0.000 description 4
- JBKVHLHDHHXQEQ-UHFFFAOYSA-N epsilon-caprolactam Chemical compound O=C1CCCCCN1 JBKVHLHDHHXQEQ-UHFFFAOYSA-N 0.000 description 4
- 229910052739 hydrogen Inorganic materials 0.000 description 4
- 239000001257 hydrogen Substances 0.000 description 4
- QQVIHTHCMHWDBS-UHFFFAOYSA-N isophthalic acid Chemical compound OC(=O)C1=CC=CC(C(O)=O)=C1 QQVIHTHCMHWDBS-UHFFFAOYSA-N 0.000 description 4
- OFOBLEOULBTSOW-UHFFFAOYSA-N Malonic acid Chemical compound OC(=O)CC(O)=O OFOBLEOULBTSOW-UHFFFAOYSA-N 0.000 description 3
- 239000004721 Polyphenylene oxide Substances 0.000 description 3
- 229920001400 block copolymer Polymers 0.000 description 3
- 229920001577 copolymer Polymers 0.000 description 3
- 239000008358 core component Substances 0.000 description 3
- 150000001991 dicarboxylic acids Chemical class 0.000 description 3
- 150000002148 esters Chemical class 0.000 description 3
- 238000002074 melt spinning Methods 0.000 description 3
- 229920000570 polyether Polymers 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- PBLZLIFKVPJDCO-UHFFFAOYSA-N 12-aminododecanoic acid Chemical compound NCCCCCCCCCCCC(O)=O PBLZLIFKVPJDCO-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 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- 239000004215 Carbon black (E152) Substances 0.000 description 2
- 239000004677 Nylon Substances 0.000 description 2
- 229920002614 Polyether block amide Polymers 0.000 description 2
- 239000002202 Polyethylene glycol Substances 0.000 description 2
- 239000006096 absorbing agent Substances 0.000 description 2
- 230000000996 additive effect Effects 0.000 description 2
- 239000001361 adipic acid Substances 0.000 description 2
- 235000011037 adipic acid Nutrition 0.000 description 2
- 239000003963 antioxidant agent Substances 0.000 description 2
- 230000003078 antioxidant effect Effects 0.000 description 2
- 239000002216 antistatic agent Substances 0.000 description 2
- 229910052799 carbon Inorganic materials 0.000 description 2
- 125000004432 carbon atom Chemical group C* 0.000 description 2
- 238000011109 contamination Methods 0.000 description 2
- 239000003484 crystal nucleating agent Substances 0.000 description 2
- 238000000354 decomposition reaction Methods 0.000 description 2
- 150000004985 diamines Chemical class 0.000 description 2
- 239000003063 flame retardant Substances 0.000 description 2
- 239000012530 fluid Substances 0.000 description 2
- 239000006081 fluorescent whitening agent Substances 0.000 description 2
- 229930195733 hydrocarbon Natural products 0.000 description 2
- 150000002430 hydrocarbons Chemical class 0.000 description 2
- 150000003951 lactams Chemical class 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000006224 matting agent Substances 0.000 description 2
- 239000000155 melt Substances 0.000 description 2
- 229920001778 nylon Polymers 0.000 description 2
- WLJVNTCWHIRURA-UHFFFAOYSA-N pimelic acid Chemical compound OC(=O)CCCCCC(O)=O WLJVNTCWHIRURA-UHFFFAOYSA-N 0.000 description 2
- 238000006068 polycondensation reaction Methods 0.000 description 2
- 229920000728 polyester Polymers 0.000 description 2
- 229920001223 polyethylene glycol Polymers 0.000 description 2
- 238000011084 recovery Methods 0.000 description 2
- 150000003839 salts Chemical class 0.000 description 2
- 235000011121 sodium hydroxide Nutrition 0.000 description 2
- TYFQFVWCELRYAO-UHFFFAOYSA-N suberic acid Chemical compound OC(=O)CCCCCCC(O)=O TYFQFVWCELRYAO-UHFFFAOYSA-N 0.000 description 2
- 229920002994 synthetic fiber Polymers 0.000 description 2
- 239000012209 synthetic fiber Substances 0.000 description 2
- 239000013076 target substance Substances 0.000 description 2
- 238000010998 test method Methods 0.000 description 2
- 239000006097 ultraviolet radiation absorber Substances 0.000 description 2
- 238000009941 weaving Methods 0.000 description 2
- 238000005303 weighing Methods 0.000 description 2
- 230000037303 wrinkles Effects 0.000 description 2
- PXGZQGDTEZPERC-UHFFFAOYSA-N 1,4-cyclohexanedicarboxylic acid Chemical compound OC(=O)C1CCC(C(O)=O)CC1 PXGZQGDTEZPERC-UHFFFAOYSA-N 0.000 description 1
- RTBFRGCFXZNCOE-UHFFFAOYSA-N 1-methylsulfonylpiperidin-4-one Chemical compound CS(=O)(=O)N1CCC(=O)CC1 RTBFRGCFXZNCOE-UHFFFAOYSA-N 0.000 description 1
- GUOSQNAUYHMCRU-UHFFFAOYSA-N 11-Aminoundecanoic acid Chemical compound NCCCCCCCCCCC(O)=O GUOSQNAUYHMCRU-UHFFFAOYSA-N 0.000 description 1
- SLXKOJJOQWFEFD-UHFFFAOYSA-N 6-aminohexanoic acid Chemical compound NCCCCCC(O)=O SLXKOJJOQWFEFD-UHFFFAOYSA-N 0.000 description 1
- 229930185605 Bisphenol Natural products 0.000 description 1
- KXDHJXZQYSOELW-UHFFFAOYSA-N Carbamic acid Chemical class NC(O)=O KXDHJXZQYSOELW-UHFFFAOYSA-N 0.000 description 1
- 229920000742 Cotton Polymers 0.000 description 1
- JHWNWJKBPDFINM-UHFFFAOYSA-N Laurolactam Chemical compound O=C1CCCCCCCCCCCN1 JHWNWJKBPDFINM-UHFFFAOYSA-N 0.000 description 1
- 229920002302 Nylon 6,6 Polymers 0.000 description 1
- 239000004372 Polyvinyl alcohol Substances 0.000 description 1
- KDYFGRWQOYBRFD-UHFFFAOYSA-N Succinic acid Natural products OC(=O)CCC(O)=O KDYFGRWQOYBRFD-UHFFFAOYSA-N 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 150000007513 acids Chemical class 0.000 description 1
- 229960002684 aminocaproic acid Drugs 0.000 description 1
- JFCQEDHGNNZCLN-UHFFFAOYSA-N anhydrous glutaric acid Natural products OC(=O)CCCC(O)=O JFCQEDHGNNZCLN-UHFFFAOYSA-N 0.000 description 1
- QFNNDGVVMCZKEY-UHFFFAOYSA-N azacyclododecan-2-one Chemical compound O=C1CCCCCCCCCCN1 QFNNDGVVMCZKEY-UHFFFAOYSA-N 0.000 description 1
- IISBACLAFKSPIT-UHFFFAOYSA-N bisphenol A Chemical compound C=1C=C(O)C=CC=1C(C)(C)C1=CC=C(O)C=C1 IISBACLAFKSPIT-UHFFFAOYSA-N 0.000 description 1
- KDYFGRWQOYBRFD-NUQCWPJISA-N butanedioic acid Chemical compound O[14C](=O)CC[14C](O)=O KDYFGRWQOYBRFD-NUQCWPJISA-N 0.000 description 1
- 229920002678 cellulose Polymers 0.000 description 1
- 239000001913 cellulose Substances 0.000 description 1
- 238000004040 coloring Methods 0.000 description 1
- 239000012141 concentrate Substances 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- BXKDSDJJOVIHMX-UHFFFAOYSA-N edrophonium chloride Chemical compound [Cl-].CC[N+](C)(C)C1=CC=CC(O)=C1 BXKDSDJJOVIHMX-UHFFFAOYSA-N 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000003822 epoxy resin Substances 0.000 description 1
- RTZKZFJDLAIYFH-UHFFFAOYSA-N ether Substances CCOCC RTZKZFJDLAIYFH-UHFFFAOYSA-N 0.000 description 1
- 239000002657 fibrous material Substances 0.000 description 1
- 229920005570 flexible polymer Polymers 0.000 description 1
- 238000009940 knitting Methods 0.000 description 1
- 230000001050 lubricating effect Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000000691 measurement method Methods 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 125000001570 methylene group Chemical group [H]C([H])([*:1])[*:2] 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- RXOHFPCZGPKIRD-UHFFFAOYSA-N naphthalene-2,6-dicarboxylic acid Chemical compound C1=C(C(O)=O)C=CC2=CC(C(=O)O)=CC=C21 RXOHFPCZGPKIRD-UHFFFAOYSA-N 0.000 description 1
- 239000004745 nonwoven fabric Substances 0.000 description 1
- AHHWIHXENZJRFG-UHFFFAOYSA-N oxetane Chemical compound C1COC1 AHHWIHXENZJRFG-UHFFFAOYSA-N 0.000 description 1
- 229920000647 polyepoxide Polymers 0.000 description 1
- 229920002451 polyvinyl alcohol Polymers 0.000 description 1
- 239000002243 precursor Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 238000004513 sizing Methods 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 229920005992 thermoplastic resin Polymers 0.000 description 1
Classifications
-
- D—TEXTILES; PAPER
- D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
- D01F—CHEMICAL FEATURES IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS; APPARATUS SPECIALLY ADAPTED FOR THE MANUFACTURE OF CARBON FILAMENTS
- D01F8/00—Conjugated, i.e. bi- or multicomponent, artificial filaments or the like; Manufacture thereof
- D01F8/04—Conjugated, i.e. bi- or multicomponent, artificial filaments or the like; Manufacture thereof from synthetic polymers
- D01F8/12—Conjugated, i.e. bi- or multicomponent, artificial filaments or the like; Manufacture thereof from synthetic polymers with at least one polyamide as constituent
-
- D—TEXTILES; PAPER
- D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
- D01D—MECHANICAL METHODS OR APPARATUS IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS
- D01D5/00—Formation of filaments, threads, or the like
- D01D5/28—Formation of filaments, threads, or the like while mixing different spinning solutions or melts during the spinning operation; Spinnerette packs therefor
- D01D5/30—Conjugate filaments; Spinnerette packs therefor
- D01D5/34—Core-skin structure; Spinnerette packs therefor
-
- D—TEXTILES; PAPER
- D03—WEAVING
- D03D—WOVEN FABRICS; METHODS OF WEAVING; LOOMS
- D03D15/00—Woven fabrics characterised by the material, structure or properties of the fibres, filaments, yarns, threads or other warp or weft elements used
- D03D15/20—Woven fabrics characterised by the material, structure or properties of the fibres, filaments, yarns, threads or other warp or weft elements used characterised by the material of the fibres or filaments constituting the yarns or threads
- D03D15/283—Woven fabrics characterised by the material, structure or properties of the fibres, filaments, yarns, threads or other warp or weft elements used characterised by the material of the fibres or filaments constituting the yarns or threads synthetic polymer-based, e.g. polyamide or polyester fibres
-
- D—TEXTILES; PAPER
- D03—WEAVING
- D03D—WOVEN FABRICS; METHODS OF WEAVING; LOOMS
- D03D15/00—Woven fabrics characterised by the material, structure or properties of the fibres, filaments, yarns, threads or other warp or weft elements used
- D03D15/20—Woven fabrics characterised by the material, structure or properties of the fibres, filaments, yarns, threads or other warp or weft elements used characterised by the material of the fibres or filaments constituting the yarns or threads
- D03D15/292—Conjugate, i.e. bi- or multicomponent, fibres or filaments
-
- D—TEXTILES; PAPER
- D03—WEAVING
- D03D—WOVEN FABRICS; METHODS OF WEAVING; LOOMS
- D03D15/00—Woven fabrics characterised by the material, structure or properties of the fibres, filaments, yarns, threads or other warp or weft elements used
- D03D15/40—Woven fabrics characterised by the material, structure or properties of the fibres, filaments, yarns, threads or other warp or weft elements used characterised by the structure of the yarns or threads
- D03D15/47—Woven fabrics characterised by the material, structure or properties of the fibres, filaments, yarns, threads or other warp or weft elements used characterised by the structure of the yarns or threads multicomponent, e.g. blended yarns or threads
-
- D—TEXTILES; PAPER
- D03—WEAVING
- D03D—WOVEN FABRICS; METHODS OF WEAVING; LOOMS
- D03D15/00—Woven fabrics characterised by the material, structure or properties of the fibres, filaments, yarns, threads or other warp or weft elements used
- D03D15/50—Woven fabrics characterised by the material, structure or properties of the fibres, filaments, yarns, threads or other warp or weft elements used characterised by the properties of the yarns or threads
- D03D15/573—Tensile strength
-
- D—TEXTILES; PAPER
- D10—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
- D10B—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
- D10B2401/00—Physical properties
-
- D—TEXTILES; PAPER
- D10—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
- D10B—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
- D10B2401/00—Physical properties
- D10B2401/02—Moisture-responsive characteristics
- D10B2401/022—Moisture-responsive characteristics hydrophylic
Definitions
- the present invention relates to a core-sheath composite cross-section fiber excellent in moisture absorbency and wrinkle prevention.
- Synthetic fibers made from thermoplastic resins such as polyamides and polyesters are widely used in clothing applications, industrial applications and the like because they are excellent in strength, chemical resistance, heat resistance and the like.
- polyamide fibers are excellent in moisture absorbing and releasing performance in addition to characteristics such as distinctive softness, high tensile strength, coloring property at dyeing, and high heat resistance, and are widely used in underwear, sportswear, and the like.
- Polyamide fibers are still insufficient in moisture absorbing and releasing performance as compared with natural fibers such as cotton, and have problems such as stuffy and sticky feeling.
- polyamide fibers are inferior to natural fibers in terms of wearing comfort.
- Patent Document 1 discloses a core-sheath composite cross-section fiber made of a core section and a sheath section, the core section being not exposed to the fiber surface, in which the core section is made from a polyether block amide copolymer having polycaproamide as a hard segment, the sheath section is made from polycaproamide, and the area ratio of the core section to the sheath section in the fiber cross-section is 3/1 to 1/5.
- Patent Document 2 discloses a core-sheath composite cross-section fiber excellent in moisture absorbing and releasing performance, the core-sheath composite cross-section fiber having a core section made from a thermoplastic polymer and a sheath section made from a fiber-forming polyamide, in which the thermoplastic polymer forming the core section contains a polyether ester amide copolymer as a main component, and the percentage of the core section is 5 to 50% by weight of the total weight of the composite fiber.
- Patent Document 3 discloses a core-sheath composite cross-section fiber excellent in antistatic performance, water absorption performance, and cool contact feeling, the core-sheath composite cross-section fiber having a core section made from a polyether block amide copolymer and a sheath section made from a fiber-forming polymer such as a polyamide or a polyester, in which the core section is exposed at an exposure angle in the range of 5° to 90°.
- the core-sheath composite cross-section fibers of Patent Documents 1 to 3 are increasingly used as woven or knitted fabrics for underwear and sports applications.
- the core-sheath composite cross-section fibers of Patent Documents 1 to 3 are excellent in moisture absorbing and releasing performance due to the high moisture-absorbing capability of the core component polymer, the core-sheath composite cross-section fibers are easily deformed and wrinkled in the dyeing step because they are made from flexible polymers having high shrinkage characteristics. Moreover, such phenomenon easily occurs also during washing. Furthermore, the core-sheath composite cross-section fibers also have problems that the core section is deteriorated due to repeated actual use, and the moisture-absorbing capability decreases due to repeated use.
- the present invention has the following constitution.
- a core-sheath composite cross-section fiber that is excellent in moisture-absorbing capability and wrinkle prevention, and that maintains the moisture-absorbing capability even after being washed.
- the core-sheath composite cross-section fiber of the present invention contains a polyamide having a dicarboxylic acid unit having, as a main component, a sebacic acid unit as a sheath polymer, and a thermoplastic polymer having high moisture-absorbing capability as a core polymer.
- the polyamide having a dicarboxylic acid unit having, as a main component, a sebacic acid unit in the sheath section is a polymer made from a so-called high molecular weight material in which a hydrocarbon is linked to a main chain via an amide bond
- specific examples of the polyamide include polypentamethylene sebacamide, polyhexamethylene sebacamide, and copolymers thereof.
- such a polyamide is preferably a polyamide mainly including polyhexamethylene sebacamide.
- the polyamide having a dicarboxylic acid unit having, as a main component, a sebacic acid unit in the sheath section may contain various additives, such as a matting agent, a flame retardant, an antioxidant, an ultraviolet absorber, an infrared absorber, a crystal nucleating agent, a fluorescent whitening agent, an antistatic agent, a hygroscopic polymer, and carbon in the form of a copolymer or a mixture as needed at a total additive content of 0.001 to 10% by weight.
- additives such as a matting agent, a flame retardant, an antioxidant, an ultraviolet absorber, an infrared absorber, a crystal nucleating agent, a fluorescent whitening agent, an antistatic agent, a hygroscopic polymer, and carbon in the form of a copolymer or a mixture as needed at a total additive content of 0.001 to 10% by weight.
- the thermoplastic polymer having high moisture-absorbing capability in the core section refers to a polymer having a ⁇ MR as measured in a pellet form of 10% or more, and examples thereof include a polyether ester amide copolymer, polyvinyl alcohol, and a cellulose thermoplastic polymer.
- a polyether ester amide copolymer is selected for the invention from the viewpoint of high thermal stability, high compatibility with the polyamide in the sheath section, and excellent peeling resistance.
- the " ⁇ MR” as used herein means a value obtained in the following manner. About 1 to 2 g of pellets are weighed in a weighing bottle, the pellets are dried at 110°C for 2 hours and the weight (W0) is measured, and then the pellets are held at 20°C and a relative humidity of 65% for 24 hours and the weight (W65) is measured. Then, the pellets are held at 30°C and a relative humidity of 90% for 24 hours and the weight (W90) is measured.
- a polyether ester amide copolymer is a block copolymer having an ether bond, an ester bond, and an amide bond in one molecular chain. More specifically, a polyether ester amide copolymer is a block copolymer obtained by the polycondensation reaction of at least one polyamide component (A) selected from lactams, aminocarboxylic acids, and salts of diamines and dicarboxylic acids, with a polyether ester component (B) formed of a dicarboxylic acid and a poly(alkylene oxide) glycol.
- A polyamide component selected from lactams, aminocarboxylic acids, and salts of diamines and dicarboxylic acids
- polyamide component (A) examples include lactams such as ⁇ -caprolactam, dodecanolactam, and undecanolactam, ⁇ -aminocarboxylic acids such as aminocaproic acid, 11-aminoundecanoic acid, and 12-aminododecanoic acid, and nylon salts of diamines and dicarboxylic acids, which are precursors of polyhexamethylene adipamide, polyhexamethylene sebacamide, polyhexamethylene dodecanamide and the like.
- a preferable polyamide component is ⁇ -caprolactam.
- the polyether ester component (B) is formed of a dicarboxylic acid having 4 to 20 carbon atoms and a poly(alkylene oxide) glycol.
- the dicarboxylic acid having 4 to 20 carbon atoms include aliphatic dicarboxylic acids such as succinic acid, glutaric acid, adipic acid, pimelic acid, suberic acid, sebacic acid, and dodecanoic acid, aromatic dicarboxylic acids such as terephthalic acid, isophthalic acid, and 2,6-naphthalenedicarboxylic acid, and alicyclic dicarboxylic acids such as 1,4-cyclohexanedicarboxylic acid.
- Preferable dicarboxylic acids are adipic acid, sebacic acid, dodecanoic acid, terephthalic acid, and isophthalic acid.
- Preferable dicarboxylic acids are adipic acid, sebacic acid, dodecanoic acid, terephthalic acid, and isophthalic acid.
- Examples of the poly(alkylene oxide) glycol include polyethylene glycol, poly(1,2- and 1,3-propylene oxide) glycol, poly(tetramethylene oxide) glycol, and poly(hexamethylene oxide) glycol. Polyethylene glycol having particularly high moisture-absorbing capability is preferable.
- the number average molecular weight of the poly (alkylene oxide) glycol is preferably from 300 to 10,000, more preferably from 500 to 5,000.
- a molecular weight of 300 or more is preferable because the poly(alkylene oxide) glycol hardly scatters to the outside of the system during the polycondensation reaction, and a fiber having stable moisture-absorbing capability is obtained.
- a molecular weight of 10,000 or less is preferable because a homogeneous block copolymer is obtained and the yarn making property is stabilized.
- the composition rate of the polyether ester component (B) is preferably from 20 to 80% in terms of the molar ratio. A composition rate of 20% or more is preferable because high moisture absorbency can be obtained. A composition rate of 80% or less is preferable because high color fastness and washing durability can be obtained.
- the core-sheath composite cross-section fiber of the present invention is required to have a boiling-water shrinkage ratio of 6.0 to 12.0%. If the boiling-water shrinkage ratio exceeds 12.0%, the fiber is easily deformed and wrinkled in the dyeing step. If the boiling-water shrinkage ratio is less than 6.0%, although the fiber is excellent in wrinkle prevention, there are cases where the operability in the yarn making step is deteriorated or the quality is deteriorated. A boiling-water shrinkage ratio within the above-mentioned range gives a fiber excellent in wrinkle prevention.
- the boiling-water shrinkage ratio is preferably from 6.0 to 10.0%.
- the core-sheath composite cross-section fiber of the present invention is required to have a stress per unit fineness during 3% elongation in a fiber tensile test of 0.60 cN/dtex or more.
- the stress during 3% elongation in a fiber tensile test is obtained by subjecting a sample to a tensile test under the constant rate extension conditions shown in JIS L1013 (Chemical fiber filament yarn test method, 2010), and obtaining the strength at 3% elongation of the sample in a tensile strength-elongation curve for the determination of the stress. This strength is divided by the fineness of the fiber to obtain the stress per unit fineness during 3% elongation in a fiber tensile test.
- the stress per unit fineness during 3% elongation in a fiber tensile test corresponds to a rising portion of the tensile strength-elongation curve, and is a parameter that shows the rigidity of the fiber.
- the stress per unit fineness during 3% elongation in a fiber tensile test is preferably 0.70 cN/dtex or more.
- the polyamide in the sheath section preferably has an ⁇ -crystal orientation parameter of 2.10 to 2.70, more preferably from 2.20 to 2.60. It is generally known that an ⁇ -crystal is a stable crystal form, and is formed when high stress is applied.
- the polyamide in the sheath section has an ⁇ -crystal orientation parameter within the above-mentioned range, the polyamide in the sheath section is preferentially stretched between a stretching roller and a take-up roller from the spinning to the take-up, so that sufficient ⁇ -crystals as a stable crystal form can be made present.
- the stretching force concentrates on the polyamide in the sheath section, and the thermoplastic polymer having high moisture-absorbing capability in the core section is suppressed in crystallization.
- the moisture-absorbing capability of the core-sheath composite fiber can be further increased, and at the same time, the rigidity of the sheath section is increased, so that the tensile stress of the core-sheath composite fiber can be further increased.
- the crystallization of the polyamide in the sheath section proceeds, and the core-sheath composite cross-section fiber is improved in the tensile stress during 3% elongation, and moreover, the crystallization of the thermoplastic polymer having high moisture-absorbing capability in the core section does not proceed, and the core-sheath composite cross-section fiber is also improved in the moisture absorbing and releasing performance.
- the polyamide has an ⁇ -crystal orientation parameter of 2.70 or less, the crystallization of the polyamide in the sheath section does not proceed, and yarn breakage and generation of fluff in the higher order processing steps can be suppressed, so that productivity is improved.
- the core-sheath composite cross-section fiber of the present invention preferably has a retention rate of stress per unit fineness during 3% elongation in a fiber tensile test of 60% or more before and after boiling water treatment.
- the retention rate of stress per unit fineness is within the above-mentioned range, changes in the fiber structure and crystal orientation degree in the dyeing step are small, the shrinkage of the fiber is suppressed, and the rigidity of the fiber is also easily maintained, so that it is possible to obtain a fiber excellent in wrinkle prevention.
- the fiber structure is changed mainly in an amorphous part, hydrogen bonds between amide bonds in the amorphous part are broken, the mobility of the molecular chain is improved, and the orientation degree is lowered.
- the fiber shrinks and the rigidity of the fiber decreases. Therefore, suppressing the shrinkage of the fiber as much as possible and maintaining the rigidity of the fiber as much as possible before and after the boiling water treatment suppress the deformation of the fiber and improve the wrinkle prevention in the dyeing step. Furthermore, deformation of the fiber is suppressed and the wrinkle prevention is improved also during washing.
- thermoplastic polymer having high moisture-absorbing capability in the core section, which constitutes the core-sheath composite cross-section fiber of the present invention is a polymer having low crystallinity and poor rigidity. Therefore, the polymer comes to have high shrinkage characteristics and is easily increased in flexibility due to boiling water treatment.
- a polyamide including polyhexamethylene sebacamide having relatively high rigidity and low shrinkability is selected from polyamides as the sheath polymer to impart rigidity to the sheath section, and further the fiber is made under specific yarn making conditions (such as the heat setting temperature and the lubrication position) as will be described later to suppress the shrinkage characteristics and improve the rigidity, so that the wrinkle prevention and moisture-absorbing capability are improved.
- the retention rate of stress per unit fineness is more preferably 70% or more.
- the core-sheath composite cross-section fiber of the present invention preferably has a tensile strength of 3.0 cN/dtex or more, more preferably from 3.5 to 5.0 cN/dtex.
- a tensile strength within the above-mentioned range makes it possible to provide a product excellent in durability in practical use.
- the core-sheath composite cross-section fiber of the present invention preferably has a degree of elongation of 35% or more, more preferably from 40 to 65%.
- a degree of elongation within the above-mentioned range improves the passability of the fiber in the higher order steps such as weaving, knitting, and false twisting.
- the core-sheath composite cross-section fiber of the present invention is required to have a function of adjusting the humidity inside the clothes.
- ⁇ MR is used as an indicator of humidity adjustment.
- the ⁇ MR is represented by the difference in moisture absorptivity between that at the temperature and humidity inside the clothes typified by 30°C ⁇ 90% RH in work on light to medium duty or light to medium exercise, and that at the outside temperature and humidity typified by 20°C ⁇ 65% RH.
- the core-sheath composite cross-section fiber of the present invention has a ⁇ MR of 5.0% or more.
- the ⁇ MR is more preferably 7.0% or more, still more preferably 10.0% or more.
- a ⁇ MR within the above-mentioned range makes it possible to suppress stuffy and sticky feeling during wearing, and to provide clothing excellent in comfort.
- the core-sheath composite cross-section fiber of the present invention has a ⁇ MR retention rate after 20 times of washing of 90% or more and 100% or less.
- the ⁇ MR retention rate is more preferably 95% or more and 100% or less.
- a ⁇ MR retention rate within the above-mentioned range provides washing durability against actual use, so that it is possible to provide clothing that maintains excellent comfort.
- a core-sheath composite cross-section fiber having a ⁇ MR of 5.0% or more and a ⁇ MR retention rate after 20 times of washing of 90% or more can provide clothing excellent in comfort that has washing durability against actual use.
- the core-sheath composite cross-section fiber of the present invention may be either of a filament and a staple depending on the application.
- the total fineness, the number of filaments (in the case of a long fiber), and the length and number of crimps (in the case of a short fiber) are also not particularly limited, but the total fineness is preferably from 5 to 235 dtex and the number of filaments is preferably from 1 to 144 in consideration of the use as a long fiber material for clothing.
- the core-sheath composite cross-section fiber of the present invention can be obtained by techniques such as melt spinning and composite spinning.
- the spinning technique are as follows. For example, a polyamide (sheath section) and a thermoplastic polymer having high moisture-absorbing capability (core section) are separately melted, and metered and transported with a gear pump, a composite flow is directly formed and discharged from a melt spinneret, and the obtained yarns are cooled to room temperature with a yarn cooling device such as a chimney, lubricated and bundled with a lubrication device, entangled with a first fluid entangling nozzle device, and stretched according to the ratio of the circumferential speed between a take-up roller and a stretching roller. Then, the yarns are heat-set with the stretching roller, and wound up with a winder (winding device) .
- a winder winding device
- the core-sheath composite cross-section fiber of the present invention it is preferable to select a polyamide having an appropriate molecular structure, and to adopt a suitable take-up speed, a suitable lubrication position, and a suitable heat setting temperature after stretching. These will be described in detail below.
- the polyamide used in the sheath section of the core-sheath composite cross-section fiber of the present invention is a polyamide having a dicarboxylic acid unit having, as a main component, a sebacic acid unit, that is, a polymer made from a so-called high molecular weight material in which a hydrocarbon is linked to a main chain via an amide bond.
- Selecting a polyamide having a high capability of forming a hydrogen bond between amide bonds for the sheath section provides a core-sheath composite cross-section fiber in which a hydrogen bond between amide bonds in an amorphous part is hardly broken even at dyeing and drying at a high temperature exceeding 100°C, and which is reduced in changes in the fiber structure of the sheath section and excellent in wrinkle prevention of the fabric at dyeing.
- the "capability of forming a hydrogen bond between amide bonds" as used herein is determined by the degree of freedom of the main chain of the polyamide molecule, that is, the number of methylene groups per one amide bond. Therefore, selecting such a polyamide for the sheath section provides a core-sheath composite cross-section fiber excellent in wrinkle prevention of the fabric at dyeing.
- the polyamide used in the core-sheath composite cross-section fiber of the present invention may contain various additives, such as a matting agent, a flame retardant, an antioxidant, an ultraviolet absorber, an infrared absorber, a crystal nucleating agent, a fluorescent whitening agent, an antistatic agent, a hygroscopic polymer, and carbon in the form of a copolymer or a mixture as needed at a total additive content of 0.001 to 10% by weight.
- additives such as a matting agent, a flame retardant, an antioxidant, an ultraviolet absorber, an infrared absorber, a crystal nucleating agent, a fluorescent whitening agent, an antistatic agent, a hygroscopic polymer, and carbon in the form of a copolymer or a mixture as needed at a total additive content of 0.001 to 10% by weight.
- the polyamide chip used in the core-sheath composite cross-section fiber of the present invention preferably has a sulfuric acid relative viscosity of 2.30 to 3.30.
- a sulfuric acid relative viscosity within the above-mentioned range makes it possible to appropriately stretch the polyamide in the sheath section.
- the sulfuric acid relative viscosity of the polyamide in the sheath section is 2.30 or more, a practically usable fiber strength and elongation is obtained.
- the sulfuric acid relative viscosity is 3.30 or less, since the polyamide has a melt viscosity suitable for spinning, the stringing property during melt spinning is improved, and a fiber can be stably produced with no yarn breakage.
- the sulfuric acid relative viscosity is more preferably from 2.50 to 3.10.
- the proportion of the core section in the core-sheath composite cross-section fiber of the present invention is preferably from 20 parts by weight to 80 parts by weight to 100 parts by weight of the composite fiber.
- the proportion of the core section is more preferably from 30 parts by weight to 70 parts by weight.
- a proportion of the core section within the above-mentioned range makes it possible to appropriately stretch the polyamide in the sheath section. In addition, such a proportion gives high color fastness and moisture-absorbing capability.
- the temperature in the melting step is preferably from 250 to 290°C for the case of a polyhexamethylene sebacamide chip as the polyamide having a dicarboxylic acid unit having, as a main component, a sebacic acid unit used in the sheath section, and is preferably from 220 to 260°C for the case of "MH1657” manufactured by ARKEMA K.K. as the thermoplastic polymer having high moisture-absorbing capability used in the core section.
- the take-up speed is preferably from 2500 to 3400 m/min.
- a take-up speed within the above-mentioned range makes the orientation crystallization of the core polymer moderately proceed and moderately suppress the crystallization of the core polymer, so that the stress per unit fineness during 3% elongation and the boiling-water shrinkage ratio can be controlled within preferable ranges, and the fiber is excellent in moisture-absorbing capability and wrinkle prevention, and can maintain the moisture-absorbing capability even after being washed.
- a take-up speed exceeding 3400 m/min makes the orientation crystallization of the polyamide in the sheath section proceed during stretching with spinning tension, but the ⁇ -crystal orientation parameter of the polyamide in the sheath section decreases, the rigidity of the sheath polymer decreases, and the fiber may be easily wrinkled due to a low mechanical stretch ratio.
- a take-up speed less than 2500 m/min provides a high mechanical stretch ratio, but due to insufficient stretching by the spinning tension, the ⁇ -crystal orientation parameter of the polyamide in the sheath section decreases, the rigidity of the sheath polymer decreases, and the fiber may be easily wrinkled.
- orientation crystallization of the core polymer proceeds, and the moisture-absorbing capability decreases.
- the take-up speed is more preferably from 2700 to 3200 m/min.
- the lubrication position is preferably at a position from 800 to 1500 mm from the lower surface of the spinneret.
- the polymer discharged from the spinneret is blown with cooling air from a cooling device to be solidified into yarns, and the yarns are stretched in the section from the solidification position to the lubrication position by spinning tension with accompanying flow, and then mechanically stretched between the take-up roller and the stretching roller.
- the core-sheath composite cross-section fiber of the present invention it is important to increase the mechanical stretch ratio in order to promote the orientation crystallization of the sheath polymer to increase the rigidity, and to decrease the spinning tension in order to suppress the orientation crystallization of the core polymer to improve the moisture-absorbing capability.
- the lubrication position at a position within the above-mentioned range makes it possible to increase the stress per unit fineness during 3% elongation in a fiber tensile test, and to provide a fiber excellent in wrinkle prevention and moisture-absorbing capability. If the lubrication position is at a position less than 800 mm from the lower surface of the spinneret, the yarns are largely bent between the spinneret and the lubrication position, and an oil is supplied to the yarns in a state where the yarns are not sufficiently solidified, so that yarn breakage frequently occurs and the operability may be deteriorated.
- the lubrication position is at a position more than 1500 mm from the lower surface of the spinneret, not only the orientation crystallization of the core polymer proceeds due to the high spinning tension to decrease the moisture-absorbing capability, but also the rigidity of the sheath polymer decreases, and the fiber may be easily wrinkled due to a low mechanical stretch ratio.
- the lubrication position is more preferably at a position from 1000 to 1300 mm from the lower surface of the spinneret.
- the temperature of the heat setting after stretching is preferably from 165 to 180°C.
- the fiber oriented and crystallized by stretching between the rollers is further crystallized by the high-temperature heat setting treatment on a heating roller, so that the fiber structure is stabilized.
- the boiling-water shrinkage ratio depends on the shrinkage of the amorphous part of the fiber, that is, the proportion of the amorphous part.
- the "heat setting temperature” as used herein means the set temperature of the heating roller.
- the core-sheath composite cross-section fiber of the present invention contains, as a sheath polymer, a polyamide having a dicarboxylic acid unit having, as a main component, a sebacic acid unit, which has relatively high rigidity and low shrinkability among polyamides, to impart rigidity to the sheath section and suppress the shrinkability of the core section.
- heat setting at a temperature within the above-mentioned range after the stretching can stabilize the fiber structure, control the boiling-water shrinkage ratio within the range of 6.0 to 12.0%, and provide a fiber excellent in wrinkle prevention. If the heat setting temperature is lower than 165°C, the crystallization of the polyamide in the sheath section is insufficient, the fiber structure is not stabilized, and the fiber may be easily wrinkled.
- the heat setting temperature exceeds 180°C, although a fiber excellent in wrinkle prevention can be obtained, contamination of the heating roller with a decomposition product of a spinning oil or the like is promoted, deterioration of the quality and breakage of the spun yarns occur frequently, the operability is deteriorated, and the fiber may be deteriorated in the process passability through higher order processing steps.
- the heat setting temperature is more preferably from 170 to 175°C.
- the core-sheath composite cross-section fiber of the present invention is excellent in moisture-absorbing capability, it is preferably used in clothing items, and the fabric form can be selected from a woven fabric, a knitted fabric, a nonwoven fabric and the like according to the purpose.
- a fabric including the core-sheath composite fiber of the present invention in at least a part thereof, which has a mixing ratio of the composite fiber of the present invention adjusted so that the ⁇ MR will be 5.0% or more, can provide clothing excellent in comfort.
- the clothing items may be various textile products such as underwear and sportswear.
- a polyamide chip sample (1 g) was dissolved in 100 ml of sulfuric acid having a concentration of 98% by weight, and the flow time (T1) of the resulting solution at 25°C was measured with an Ostwald viscometer. Then, the flow time (T2) of sulfuric acid having a concentration of 98% by weight alone was measured. The ratio of T1 to T2, that is, T1/T2, was taken as the sulfuric acid relative viscosity.
- a polyether ester amide copolymer chip sample (1 g) was dissolved in 100 ml of ortho-chlorophenol, and the flow time (T1) of the resulting solution at 25°C was measured with an Ostwald viscometer. Then, the flow time (T2) of ortho-chlorophenol alone was measured. The ratio of T1 to T2, that is, T1/T2, was taken as the ortho-chlorophenol relative viscosity.
- a fiber sample was set on a sizing reel having a perimeter of 1.125 m, and rotated 200 times to make a looped skein.
- the skein was dried (105 ⁇ 2°C ⁇ 60 minutes) with a hot air dryer, and the skein weight was measured with a scaling balance. The fineness based on corrected mass was calculated from the value obtained by multiplying the skein weight by the official regain.
- a fiber sample was measured with "TENSILON” (registered trademark) UCT-100 manufactured by ORIENTEC CORPORATION under the constant rate extension conditions shown in JIS L1013 (Chemical fiber filament yarn test method, 2010).
- the degree of elongation was determined from the elongation of a point showing the maximum strength in a tensile strength-elongation curve.
- the strength was a value obtained by dividing the maximum strength by the fineness based on corrected mass. The measurement was carried out 10 times, and the average values were taken as the strength and degree of elongation.
- a tensile test of a fiber sample was carried out by the method described in the item (4), and the strength at the point where the sample showed 3% elongation in the tensile strength-elongation curve was determined and taken as the stress during 3% elongation. The measurement was carried out 10 times, and the average value was taken as the stress during 3% elongation.
- a fiber sample was measured by laser Raman spectroscopy, and a ratio between the intensity ratio of Raman bands derived from a nylon ⁇ -crystal observed at around 1120 cm -1 in parallel polarization ((I1120) parallel) and the intensity ratio of Raman bands in vertical polarization ((I1120) vertical) was obtained as a parameter for the evaluation of orientation degree. Further, the scattering intensity under each polarization condition (parallel/vertical) was normalized on the basis of the Raman band intensity of the CH deformation band (around 1440 cm -1 ) having small anisotropy of orientation.
- ⁇ ⁇ Crystal orientation parameter I1120/I1440 parallel/ I1120 / I1440 vertical
- the fiber sample for orientation measurement was embedded in a resin (bisphenol type epoxy resin, cured for 24 hours), and then sectioned with a microtome.
- the section had a thickness of 2.0 ⁇ m.
- the section sample was cut slightly inclined from the fiber axis so that the cut face would have an elliptical shape, and the portion where the thickness of the minor axis of the ellipse was constant was selected and measured.
- the measurement was performed in the microscopic mode, and the spot diameter of the laser at the sample position was 1 ⁇ m.
- the orientation of the centers of the core and sheath layers was analyzed, and the orientation was measured under polarization conditions.
- the orientation degree was evaluated based on the ratio between the Raman band intensities obtained under a parallel condition in which the polarization direction coincided with the fiber axis and a vertical condition in which the polarization direction was orthogonal to the fiber axis. The measurement was performed 3 times for each measurement point, and the average thereof was used. Detailed conditions are shown below.
- the boiling-water shrinkage ratio was measured according to JIS L1013: 2010 8.18.1 (method B).
- the core-sheath composite cross-section fiber of the present invention was used as the warp and the weft. At a warp density of 188 yarns/2.54 cm and a weft density of 155 yarns/2.54 cm, the fiber was woven into a flat structure with a water jet loom.
- the resulting gray fabric was scoured with an open soaper in a solution containing 2 g of caustic soda (NaOH) per liter, dried in a cylinder dryer at 120°C, and then preset at 170°C. Then, the gray fabric was heated to 120°C at a rate of 2.0°C/min in a pressure-resistant drum type dyeing machine, and dyed at a set temperature of 120°C for 60 minutes. After the dyeing, the fabric was washed with running water for 20 minutes, and dehydrated and dried to give a woven fabric having a warp density of 200 yarns/2.54 cm and a weft density of 160 yarns/2.54 cm.
- the woven fabric obtained in the item (8) was subjected to the method described in paragraph 9 of JIS L1059-2 (Testing methods for crease recovery of textiles - Part 2: Evaluation of the wrinkle recovery of fabrics (wrinkle method), 2009), and the wrinkle prevention was judged as Grade 5 (the most smooth appearance) to Grade 1 (the most wrinkly appearance) .
- Grade 5 the most smooth appearance
- Grade 1 the most wrinkly appearance
- the woven fabric obtained in the item (8) (about 1 to 2 g) was weighed in a weighing bottle, held at 110°C for 2 hours to dry, and the weight (W0) was measured. Then, a target substance was held at 20°C and a relative humidity of 65% for 24 hours, and then the weight (W65) was measured. Then, the target substance was held at 30°C and a relative humidity of 90% for 24 hours, and then the weight (W90) was measured. Then, the ⁇ MR was calculated according to the following formulae.
- MR65 W65 ⁇ W0 / W0 ⁇ 100 %
- the woven fabric obtained in the item (8) was repeatedly subjected to 20 times of washing by the method described in No. 103 in the attached table 1 of JIS L0217 (1995), and then the ⁇ MR described in the item (10) was calculated.
- the woven fabric was judged to give high wearing comfort.
- the ⁇ MR retention rate after washing was calculated according to the following formula as an index of change of ⁇ MR before and after washing.
- ⁇ MR after washing treatment ⁇ ⁇ MR before washing treatment / ⁇ MR before washing treatment ⁇ 100
- the core-sheath composite cross-section fiber of the present invention 10 pieces (1000 m/piece) of plain weave fabrics were woven with a water jet loom at a loom rotation speed of 750 rpm and a weft length of 1620 mm. The number of stoppage of the loom due to yarn breakage during the weaving was evaluated. When the number of yarn breakage was 2 times or less, the fiber was judged to be good in process passability.
- a polyether ester amide copolymer (MH1657 manufactured by ARKEMA K.K. (chip ⁇ MR: 18.9)) having an ortho-chlorophenol relative viscosity of 1.69 as a core section, and nylon 610 having a sulfuric acid relative viscosity of 2.72 as a sheath section were melted at 270°C, and spun from a concentric core-sheath composite spinneret so that the core/sheath ratio (parts by weight) would be 50/50.
- the rotation speed of the gear pump was selected so that the obtained core-sheath composite yarn would have a total fineness of 56 dtex, and the polymers were each discharged at 22 g/min. Then, the yarns were cooled and solidified with a yarn cooling device, and an anhydrous oil was supplied with a lubrication device from a lubrication position at a position of 1000 mm from the lower surface of the spinneret.
- the yarns were entangled with a first fluid entangling nozzle device, stretched at a circumferential speed of a take-up roller as a first roll of 2800 m/min and a stretch ratio between the take-up roller and a stretching roller of 1.50 times, and heat-set at a set temperature of the stretching roller of 170°C. Then, the yarns were wound up at a winding speed of 4000 m/min to give a core-sheath composite cross-section fiber of 56 dtex/24 filaments.
- the fineness, strength, degree of elongation, stress per unit fineness during 3% elongation, boiling-water shrinkage ratio, retention rate of stress per unit fineness during 3% elongation before and after boiling water treatment, and ⁇ -crystal orientation parameter were measured.
- the obtained woven fabric was evaluated for wrinkle prevention, ⁇ MR, ⁇ MR after washing, and ⁇ MR retention rate after washing. The results are shown in Table 1.
- a core-sheath composite cross-section fiber of 56 dtex/24 filaments was obtained in the same manner as in Example 1 except that the heat setting temperature of the heating roller was 180°C.
- the fineness, strength, degree of elongation, stress per unit fineness during 3% elongation, boiling-water shrinkage ratio, retention rate of stress during 3% elongation before and after boiling water treatment, and ⁇ -crystal orientation parameter were measured.
- the obtained woven fabric was evaluated for wrinkle prevention, ⁇ MR, ⁇ MR after washing, and ⁇ MR retention rate after washing. The results are shown in Table 1.
- a core-sheath composite cross-section fiber of 56 dtex/24 filaments was obtained in the same manner as in Example 1 except that the heat setting temperature of the heating roller was 165°C.
- the fineness, strength, degree of elongation, stress per unit fineness during 3% elongation, boiling-water shrinkage ratio, retention rate of stress during 3% elongation before and after boiling water treatment, and ⁇ -crystal orientation parameter were measured.
- the obtained woven fabric was evaluated for wrinkle prevention, ⁇ MR, ⁇ MR after washing, and ⁇ MR retention rate after washing. The results are shown in Table 1.
- a core-sheath composite cross-section fiber of 56 dtex/24 filaments was obtained in the same manner as in Example 1 except that the lubrication position was at a position of 1500 mm from the lower surface of the spinneret, and the yarns were wound up at a winding speed of 3900 m/min.
- the fineness, strength, degree of elongation, stress per unit fineness during 3% elongation, boiling-water shrinkage ratio, retention rate of stress during 3% elongation before and after boiling water treatment, and ⁇ -crystal orientation parameter were measured.
- the obtained woven fabric was evaluated for wrinkle prevention, ⁇ MR, ⁇ MR after washing, and ⁇ MR retention rate after washing. The results are shown in Table 1.
- a core-sheath composite cross-section fiber of 56 dtex/24 filaments was obtained in the same manner as in Example 1 except that the lubrication position was at a position of 800 mm from the lower surface of the spinneret.
- the fineness, strength, degree of elongation, stress per unit fineness during 3% elongation, boiling-water shrinkage ratio, retention rate of stress during 3% elongation before and after boiling water treatment, and ⁇ -crystal orientation parameter were measured.
- the obtained woven fabric was evaluated for wrinkle prevention, ⁇ MR, ⁇ MR after washing, and ⁇ MR retention rate after washing. The results are shown in Table 1.
- a core-sheath composite cross-section fiber of 56 dtex/24 filaments was obtained in the same manner as in Example 1 except that the lubrication position was at a position of 1500 mm from the lower surface of the spinneret, the stretch ratio between the take-up roller and the stretching roller was 1.45 times, and the yarns were wound up at a winding speed of 3900 m/min.
- the fineness, strength, degree of elongation, stress per unit fineness during 3% elongation, boiling-water shrinkage ratio, retention rate of stress during 3% elongation before and after boiling water treatment, and ⁇ -crystal orientation parameter were measured.
- the obtained woven fabric was evaluated for wrinkle prevention, ⁇ MR, ⁇ MR after washing, and ⁇ MR retention rate after washing. The results are shown in Table 1.
- a core-sheath composite cross-section fiber of 56 dtex/24 filaments was obtained in the same manner as in Example 1 except that the lubrication position was at a position of 800 mm from the lower surface of the spinneret, the stretch ratio between the take-up roller and the stretching roller was 1.55 times, and the yarns were wound up at a winding speed of 4100 m/min.
- the fineness, strength, degree of elongation, stress per unit fineness during 3% elongation, boiling-water shrinkage ratio, retention rate of stress during 3% elongation before and after boiling water treatment, and ⁇ -crystal orientation parameter were measured.
- the obtained woven fabric was evaluated for wrinkle prevention, ⁇ MR, ⁇ MR after washing, and ⁇ MR retention rate after washing. The results are shown in Table 1.
- a core-sheath composite cross-section fiber of 56 dtex/24 filaments was obtained in the same manner as in Example 1 except that the circumferential speed of the take-up roller as a first roll was 2500 m/min, the stretch ratio between the take-up roller and the stretching roller was 1.65 times, and the yarns were wound up at a winding speed of 3900 m/min.
- the fineness, strength, degree of elongation, stress per unit fineness during 3% elongation, boiling-water shrinkage ratio, retention rate of stress during 3% elongation before and after boiling water treatment, and ⁇ -crystal orientation parameter were measured.
- the obtained woven fabric was evaluated for wrinkle prevention, ⁇ MR, ⁇ MR after washing, and ⁇ MR retention rate after washing. The results are shown in Table 1.
- a core-sheath composite cross-section fiber of 56 dtex/24 filaments was obtained in the same manner as in Example 1 except that the circumferential speed of the take-up roller as a first roll was 3400 m/min, the stretch ratio between the take-up roller and the stretching roller was 1.20 times, and the yarns were wound up at a winding speed of 3900 m/min.
- the fineness, strength, degree of elongation, stress per unit fineness during 3% elongation, boiling-water shrinkage ratio, retention rate of stress during 3% elongation before and after boiling water treatment, and ⁇ -crystal orientation parameter were measured.
- the obtained woven fabric was evaluated for wrinkle prevention, ⁇ MR, ⁇ MR after washing, and ⁇ MR retention rate after washing. The results are shown in Table 1.
- a core-sheath composite cross-section fiber of 56 dtex/24 filaments was obtained in the same manner as in Example 1 except that the heat setting temperature of the heating roller was 190°C.
- the fineness, strength, degree of elongation, stress per unit fineness during 3% elongation, boiling-water shrinkage ratio, retention rate of stress during 3% elongation before and after boiling water treatment, and ⁇ -crystal orientation parameter were measured.
- the obtained woven fabric was evaluated for wrinkle prevention, ⁇ MR, ⁇ MR after washing, and ⁇ MR retention rate after washing. The results are shown in Table 2.
- the fiber was excellent in moisture-absorbing capability and wrinkle prevention, and maintained moisture-absorbing capability even after being washed.
- contamination of the heating roller with a decomposition product of a spinning oil or the like was promoted, yarn breakage in the higher order processing steps occurred frequently, and the fiber was poor in the process passability.
- a core-sheath composite cross-section fiber of 56 dtex/24 filaments was obtained in the same manner as in Example 1 except that the set temperature of the stretching roller was 150°C.
- the fineness, strength, degree of elongation, stress per unit fineness during 3% elongation, boiling-water shrinkage ratio, retention rate of stress during 3% elongation before and after boiling water treatment, and ⁇ -crystal orientation parameter were measured.
- the obtained woven fabric was evaluated for wrinkle prevention, ⁇ MR, ⁇ MR after washing, and ⁇ MR retention rate after washing. The results are shown in Table 2.
- a core-sheath composite cross-section fiber of 56 dtex/24 filaments was obtained in the same manner as in Example 1 except that the lubrication position was at a position of 1800 mm from the lower surface of the spinneret, the stretch ratio between the take-up roller and the stretching roller was 1.30 times, and the yarns were wound up at a winding speed of 3500 m/min.
- the fineness, strength, degree of elongation, stress per unit fineness during 3% elongation, boiling-water shrinkage ratio, retention rate of stress during 3% elongation before and after boiling water treatment, and ⁇ -crystal orientation parameter were measured.
- the obtained woven fabric was evaluated for wrinkle prevention, ⁇ MR, ⁇ MR after washing, and ⁇ MR retention rate after washing. The results are shown in Table 2.
- a core-sheath composite cross-section fiber of 56 dtex/24 filaments was obtained in the same manner as in Example 1 except that the circumferential speed of the take-up roller as a first roll was 2200 m/min, the stretch ratio between the take-up roller and the stretching roller was 1.80 times, and the yarns were wound up at a winding speed of 3800 m/min.
- the fineness, strength, degree of elongation, stress per unit fineness during 3% elongation, boiling-water shrinkage ratio, retention rate of stress during 3% elongation before and after boiling water treatment, and ⁇ -crystal orientation parameter were measured.
- the obtained woven fabric was evaluated for wrinkle prevention, ⁇ MR, ⁇ MR after washing, and ⁇ MR retention rate after washing. The results are shown in Table 2.
- a core-sheath composite cross-section fiber of 56 dtex/24 filaments was obtained in the same manner as in Example 1 except that the circumferential speed of the take-up roller as a first roll was 3700 m/min, the stretch ratio between the take-up roller and the stretching roller was 1.05 times, and the yarns were wound up at a winding speed of 3700 m/min.
- the fineness, strength, degree of elongation, stress per unit fineness during 3% elongation, boiling-water shrinkage ratio, retention rate of stress during 3% elongation before and after boiling water treatment, and ⁇ -crystal orientation parameter were measured.
- the obtained woven fabric was evaluated for wrinkle prevention, ⁇ MR, ⁇ MR after washing, and ⁇ MR retention rate after washing. The results are shown in Table 2.
- the rigidity of nylon 610 in the sheath section was low, the balance of shrinkage characteristics between nylon 610 in the sheath section and the polyether ester amide copolymer in the core section was disrupted, the stress per unit fineness during 3% elongation was as low as 0.54 cN/dtex, the woven fabric was wrinkled, yarn breakage in the higher order processing steps occurred frequently, and the fiber was poor in the process passability.
- a core-sheath composite cross-section fiber of 56 dtex/24 filaments was obtained in the same manner as in Example 1 except that nylon 6 having a sulfuric acid relative viscosity of 2.40 was used in the sheath section, and the heat setting temperature of the heating roller was 150°C.
- the fineness, strength, degree of elongation, stress per unit fineness during 3% elongation, boiling-water shrinkage ratio, retention rate of stress during 3% elongation before and after boiling water treatment, and ⁇ -crystal orientation parameter were measured.
- the obtained woven fabric was evaluated for wrinkle prevention, ⁇ MR, ⁇ MR after washing, and ⁇ MR retention rate after washing. The results are shown in Table 2.
- the rigidity of nylon 6 in the sheath section was low, the balance of shrinkage characteristics between nylon 6 in the sheath section and the polyether ester amide copolymer in the core section was disrupted, the stress per unit fineness during 3% elongation was as low as 0.53 cN/dtex, and the woven fabric was wrinkled.
- Example 1 Example 2
- Example 3 Example 4
- Example 5 Example 6
- Example 7 Example 8
- Example 9 Core component Polymer Polyether ester amide copolymer Polyether ester amide copolymer Polyether ester amide copolymer Polyether ester amide copolymer Polyether ester amide copolymer Polyether ester amide copolymer OCP relative viscosity 1.69 1.69 1.69 1.69 1.69 1.69 1.69 Sheath component Polymer Nylon 610 Nylon 610 Nylon 610 Nylon 610 Nylon 610 Nylon 610 Nylon 610 Nylon 610 Sulfuric acid relative viscosity 2.72 2.72 2.72 2.72 2.72 2.72 2.72 2.72 2.72 2.72 2.72 2.72 Yarn making conditions Take-up speed (m/min) 2,800 2,800 2,800 2,800 2,800 2,800 2,800 2,800 2,500 3,400 Stretch ratio 1.50 1.50 1.50 1.50 1.50 1.50 1.50 1.50
Description
- The present invention relates to a core-sheath composite cross-section fiber excellent in moisture absorbency and wrinkle prevention.
- Synthetic fibers made from thermoplastic resins such as polyamides and polyesters are widely used in clothing applications, industrial applications and the like because they are excellent in strength, chemical resistance, heat resistance and the like.
- In particular, polyamide fibers are excellent in moisture absorbing and releasing performance in addition to characteristics such as distinctive softness, high tensile strength, coloring property at dyeing, and high heat resistance, and are widely used in underwear, sportswear, and the like. Polyamide fibers, however, are still insufficient in moisture absorbing and releasing performance as compared with natural fibers such as cotton, and have problems such as stuffy and sticky feeling. Thus, polyamide fibers are inferior to natural fibers in terms of wearing comfort.
- From such a background, synthetic fibers that exhibit excellent moisture absorbing and releasing performance for preventing stuffy and sticky feeling, and that give wearing comfort comparable to that of natural fibers are demanded mainly for underwear and sportswear applications.
- In view of this, Patent Document 1 discloses a core-sheath composite cross-section fiber made of a core section and a sheath section, the core section being not exposed to the fiber surface, in which the core section is made from a polyether block amide copolymer having polycaproamide as a hard segment, the sheath section is made from polycaproamide, and the area ratio of the core section to the sheath section in the fiber cross-section is 3/1 to 1/5.
- Moreover, Patent Document 2 discloses a core-sheath composite cross-section fiber excellent in moisture absorbing and releasing performance, the core-sheath composite cross-section fiber having a core section made from a thermoplastic polymer and a sheath section made from a fiber-forming polyamide, in which the thermoplastic polymer forming the core section contains a polyether ester amide copolymer as a main component, and the percentage of the core section is 5 to 50% by weight of the total weight of the composite fiber.
- Moreover, Patent Document 3 discloses a core-sheath composite cross-section fiber excellent in antistatic performance, water absorption performance, and cool contact feeling, the core-sheath composite cross-section fiber having a core section made from a polyether block amide copolymer and a sheath section made from a fiber-forming polymer such as a polyamide or a polyester, in which the core section is exposed at an exposure angle in the range of 5° to 90°. The core-sheath composite cross-section fibers of Patent Documents 1 to 3 are increasingly used as woven or knitted fabrics for underwear and sports applications.
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- Patent Document 1: International Publication No.
2014/10709 - Patent Document 2:
Japanese Patent Laid-open Publication No. 6-136618 - Patent Document 3: International Publication No.
2008/123586 - Although the core-sheath composite cross-section fibers of Patent Documents 1 to 3 are excellent in moisture absorbing and releasing performance due to the high moisture-absorbing capability of the core component polymer, the core-sheath composite cross-section fibers are easily deformed and wrinkled in the dyeing step because they are made from flexible polymers having high shrinkage characteristics. Moreover, such phenomenon easily occurs also during washing. Furthermore, the core-sheath composite cross-section fibers also have problems that the core section is deteriorated due to repeated actual use, and the moisture-absorbing capability decreases due to repeated use.
- It is an object of the present invention to overcome the problems of the prior techniques and to provide a core-sheath composite cross-section fiber excellent in moisture absorbing and releasing performance and wrinkle prevention. It is another object of the present invention to provide a core-sheath composite cross-section fiber that maintains the moisture-absorbing capability even after being washed.
- In order to solve the above-mentioned problems, the present invention has the following constitution.
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- (1) A core-sheath composite cross-section fiber, comprising: a thermoplastic polymer as a core polymer; and a polyamide having a dicarboxylic acid unit having, as a main component, a sebacic acid unit as a sheath polymer, the core-sheath composite cross-section fiber having a ΔMR of 5.0% or more, a ΔMR retention rate after 20 times of washing of 90% or more and 100% or less, a boiling-water shrinkage ratio of 6.0 to 12.0%, and a stress per unit fineness during 3% elongation in a fiber tensile test of 0.60 cN/dtex or more, wherein the thermoplastic polymer is a polyether ester amide copolymer.
- (2) The core-sheath composite cross-section fiber according to (1), wherein a sheath section has an α-crystal orientation parameter of 2.10 to 2.70.
- (3) The core-sheath composite cross-section fiber according to (1) or (2), having a retention rate of stress per unit fineness during 3% elongation in a fiber tensile test of 60% or more before and after boiling water treatment.
- (4) A fabric including the core-sheath composite cross-section fiber according to any one of (1) to (3) in at least a part thereof.
- (5) A textile product including the core-sheath composite cross-section fiber according to any one of (1) to (3) in at least a part thereof.
- According to the present invention, it is possible to provide a core-sheath composite cross-section fiber that is excellent in moisture-absorbing capability and wrinkle prevention, and that maintains the moisture-absorbing capability even after being washed.
- The core-sheath composite cross-section fiber of the present invention contains a polyamide having a dicarboxylic acid unit having, as a main component, a sebacic acid unit as a sheath polymer, and a thermoplastic polymer having high moisture-absorbing capability as a core polymer.
- The polyamide having a dicarboxylic acid unit having, as a main component, a sebacic acid unit in the sheath section is a polymer made from a so-called high molecular weight material in which a hydrocarbon is linked to a main chain via an amide bond, and specific examples of the polyamide include polypentamethylene sebacamide, polyhexamethylene sebacamide, and copolymers thereof. From the viewpoint of economy, relatively easy yarn making, and excellent dyeability and mechanical characteristics, such a polyamide is preferably a polyamide mainly including polyhexamethylene sebacamide.
- The polyamide having a dicarboxylic acid unit having, as a main component, a sebacic acid unit in the sheath section may contain various additives, such as a matting agent, a flame retardant, an antioxidant, an ultraviolet absorber, an infrared absorber, a crystal nucleating agent, a fluorescent whitening agent, an antistatic agent, a hygroscopic polymer, and carbon in the form of a copolymer or a mixture as needed at a total additive content of 0.001 to 10% by weight.
- The thermoplastic polymer having high moisture-absorbing capability in the core section refers to a polymer having a ΔMR as measured in a pellet form of 10% or more, and examples thereof include a polyether ester amide copolymer, polyvinyl alcohol, and a cellulose thermoplastic polymer. Among these, a polyether ester amide copolymer is selected for the invention from the viewpoint of high thermal stability, high compatibility with the polyamide in the sheath section, and excellent peeling resistance.
- The "ΔMR" as used herein means a value obtained in the following manner. About 1 to 2 g of pellets are weighed in a weighing bottle, the pellets are dried at 110°C for 2 hours and the weight (W0) is measured, and then the pellets are held at 20°C and a relative humidity of 65% for 24 hours and the weight (W65) is measured. Then, the pellets are held at 30°C and a relative humidity of 90% for 24 hours and the weight (W90) is measured. The ΔMR is calculated according to the following formulae.
- A polyether ester amide copolymer is a block copolymer having an ether bond, an ester bond, and an amide bond in one molecular chain. More specifically, a polyether ester amide copolymer is a block copolymer obtained by the polycondensation reaction of at least one polyamide component (A) selected from lactams, aminocarboxylic acids, and salts of diamines and dicarboxylic acids, with a polyether ester component (B) formed of a dicarboxylic acid and a poly(alkylene oxide) glycol.
- Examples of the polyamide component (A) include lactams such as ε-caprolactam, dodecanolactam, and undecanolactam, ω-aminocarboxylic acids such as aminocaproic acid, 11-aminoundecanoic acid, and 12-aminododecanoic acid, and nylon salts of diamines and dicarboxylic acids, which are precursors of polyhexamethylene adipamide, polyhexamethylene sebacamide, polyhexamethylene dodecanamide and the like. A preferable polyamide component is ε-caprolactam.
- The polyether ester component (B) is formed of a dicarboxylic acid having 4 to 20 carbon atoms and a poly(alkylene oxide) glycol. Examples of the dicarboxylic acid having 4 to 20 carbon atoms include aliphatic dicarboxylic acids such as succinic acid, glutaric acid, adipic acid, pimelic acid, suberic acid, sebacic acid, and dodecanoic acid, aromatic dicarboxylic acids such as terephthalic acid, isophthalic acid, and 2,6-naphthalenedicarboxylic acid, and alicyclic dicarboxylic acids such as 1,4-cyclohexanedicarboxylic acid. One of them or a mixture of two or more of them can be used. Preferable dicarboxylic acids are adipic acid, sebacic acid, dodecanoic acid, terephthalic acid, and isophthalic acid. Examples of the poly(alkylene oxide) glycol include polyethylene glycol, poly(1,2- and 1,3-propylene oxide) glycol, poly(tetramethylene oxide) glycol, and poly(hexamethylene oxide) glycol. Polyethylene glycol having particularly high moisture-absorbing capability is preferable.
- The number average molecular weight of the poly (alkylene oxide) glycol is preferably from 300 to 10,000, more preferably from 500 to 5,000. A molecular weight of 300 or more is preferable because the poly(alkylene oxide) glycol hardly scatters to the outside of the system during the polycondensation reaction, and a fiber having stable moisture-absorbing capability is obtained. Meanwhile, a molecular weight of 10,000 or less is preferable because a homogeneous block copolymer is obtained and the yarn making property is stabilized.
- The composition rate of the polyether ester component (B) is preferably from 20 to 80% in terms of the molar ratio. A composition rate of 20% or more is preferable because high moisture absorbency can be obtained. A composition rate of 80% or less is preferable because high color fastness and washing durability can be obtained.
- As such a polyether ester amide copolymer, "MH1657" and "MV1074" manufactured by ARKEMA K.K. and the like are commercially available.
- The core-sheath composite cross-section fiber of the present invention is required to have a boiling-water shrinkage ratio of 6.0 to 12.0%. If the boiling-water shrinkage ratio exceeds 12.0%, the fiber is easily deformed and wrinkled in the dyeing step. If the boiling-water shrinkage ratio is less than 6.0%, although the fiber is excellent in wrinkle prevention, there are cases where the operability in the yarn making step is deteriorated or the quality is deteriorated. A boiling-water shrinkage ratio within the above-mentioned range gives a fiber excellent in wrinkle prevention. The boiling-water shrinkage ratio is preferably from 6.0 to 10.0%.
- The core-sheath composite cross-section fiber of the present invention is required to have a stress per unit fineness during 3% elongation in a fiber tensile test of 0.60 cN/dtex or more. The stress during 3% elongation in a fiber tensile test is obtained by subjecting a sample to a tensile test under the constant rate extension conditions shown in JIS L1013 (Chemical fiber filament yarn test method, 2010), and obtaining the strength at 3% elongation of the sample in a tensile strength-elongation curve for the determination of the stress. This strength is divided by the fineness of the fiber to obtain the stress per unit fineness during 3% elongation in a fiber tensile test.
- The stress per unit fineness during 3% elongation in a fiber tensile test corresponds to a rising portion of the tensile strength-elongation curve, and is a parameter that shows the rigidity of the fiber. The larger the value is (the steeper the rise of the tensile strength-elongation curve is), the more rigid the fiber is. That is, a fiber having a stress per unit fineness during 3% elongation in a fiber tensile test of 0.60 cN/dtex or more is suppressed in deformation in the dyeing step, and is excellent in wrinkle prevention. The stress per unit fineness during 3% elongation in a fiber tensile test is preferably 0.70 cN/dtex or more.
- In the core-sheath composite cross-section fiber of the present invention, the polyamide in the sheath section preferably has an α-crystal orientation parameter of 2.10 to 2.70, more preferably from 2.20 to 2.60. It is generally known that an α-crystal is a stable crystal form, and is formed when high stress is applied. When the polyamide in the sheath section has an α-crystal orientation parameter within the above-mentioned range, the polyamide in the sheath section is preferentially stretched between a stretching roller and a take-up roller from the spinning to the take-up, so that sufficient α-crystals as a stable crystal form can be made present. As a result, at the time of melt spinning, the stretching force concentrates on the polyamide in the sheath section, and the thermoplastic polymer having high moisture-absorbing capability in the core section is suppressed in crystallization. As a result, the moisture-absorbing capability of the core-sheath composite fiber can be further increased, and at the same time, the rigidity of the sheath section is increased, so that the tensile stress of the core-sheath composite fiber can be further increased.
- When the polyamide in the sheath section has an α-crystal orientation parameter of 2.10 or more, the crystallization of the polyamide in the sheath section proceeds, and the core-sheath composite cross-section fiber is improved in the tensile stress during 3% elongation, and moreover, the crystallization of the thermoplastic polymer having high moisture-absorbing capability in the core section does not proceed, and the core-sheath composite cross-section fiber is also improved in the moisture absorbing and releasing performance. On the other hand, when the polyamide has an α-crystal orientation parameter of 2.70 or less, the crystallization of the polyamide in the sheath section does not proceed, and yarn breakage and generation of fluff in the higher order processing steps can be suppressed, so that productivity is improved.
- The core-sheath composite cross-section fiber of the present invention preferably has a retention rate of stress per unit fineness during 3% elongation in a fiber tensile test of 60% or more before and after boiling water treatment. When the retention rate of stress per unit fineness is within the above-mentioned range, changes in the fiber structure and crystal orientation degree in the dyeing step are small, the shrinkage of the fiber is suppressed, and the rigidity of the fiber is also easily maintained, so that it is possible to obtain a fiber excellent in wrinkle prevention. In a fiber subjected to boiling water treatment, the fiber structure is changed mainly in an amorphous part, hydrogen bonds between amide bonds in the amorphous part are broken, the mobility of the molecular chain is improved, and the orientation degree is lowered. As a result of the changes in the fiber structure in the amorphous part and the orientation degree, the fiber shrinks and the rigidity of the fiber decreases. Therefore, suppressing the shrinkage of the fiber as much as possible and maintaining the rigidity of the fiber as much as possible before and after the boiling water treatment suppress the deformation of the fiber and improve the wrinkle prevention in the dyeing step. Furthermore, deformation of the fiber is suppressed and the wrinkle prevention is improved also during washing.
- The thermoplastic polymer having high moisture-absorbing capability in the core section, which constitutes the core-sheath composite cross-section fiber of the present invention, is a polymer having low crystallinity and poor rigidity. Therefore, the polymer comes to have high shrinkage characteristics and is easily increased in flexibility due to boiling water treatment. Therefore, in the core-sheath composite cross-section fiber of the present invention, a polyamide including polyhexamethylene sebacamide having relatively high rigidity and low shrinkability is selected from polyamides as the sheath polymer to impart rigidity to the sheath section, and further the fiber is made under specific yarn making conditions (such as the heat setting temperature and the lubrication position) as will be described later to suppress the shrinkage characteristics and improve the rigidity, so that the wrinkle prevention and moisture-absorbing capability are improved. The retention rate of stress per unit fineness is more preferably 70% or more.
- The core-sheath composite cross-section fiber of the present invention preferably has a tensile strength of 3.0 cN/dtex or more, more preferably from 3.5 to 5.0 cN/dtex. A tensile strength within the above-mentioned range makes it possible to provide a product excellent in durability in practical use.
- The core-sheath composite cross-section fiber of the present invention preferably has a degree of elongation of 35% or more, more preferably from 40 to 65%. A degree of elongation within the above-mentioned range improves the passability of the fiber in the higher order steps such as weaving, knitting, and false twisting.
- In order to give high wearing comfort, the core-sheath composite cross-section fiber of the present invention is required to have a function of adjusting the humidity inside the clothes. As an indicator of humidity adjustment, ΔMR is used. The ΔMR is represented by the difference in moisture absorptivity between that at the temperature and humidity inside the clothes typified by 30°C × 90% RH in work on light to medium duty or light to medium exercise, and that at the outside temperature and humidity typified by 20°C × 65% RH. The larger the ΔMR is, the higher the moisture-absorbing capability is, and a larger ΔMR corresponds to higher wearing comfort.
- The core-sheath composite cross-section fiber of the present invention has a ΔMR of 5.0% or more. The ΔMR is more preferably 7.0% or more, still more preferably 10.0% or more. A ΔMR within the above-mentioned range makes it possible to suppress stuffy and sticky feeling during wearing, and to provide clothing excellent in comfort.
- The core-sheath composite cross-section fiber of the present invention has a ΔMR retention rate after 20 times of washing of 90% or more and 100% or less. The ΔMR retention rate is more preferably 95% or more and 100% or less. A ΔMR retention rate within the above-mentioned range provides washing durability against actual use, so that it is possible to provide clothing that maintains excellent comfort. Furthermore, a core-sheath composite cross-section fiber having a ΔMR of 5.0% or more and a ΔMR retention rate after 20 times of washing of 90% or more can provide clothing excellent in comfort that has washing durability against actual use.
- The core-sheath composite cross-section fiber of the present invention may be either of a filament and a staple depending on the application. The total fineness, the number of filaments (in the case of a long fiber), and the length and number of crimps (in the case of a short fiber) are also not particularly limited, but the total fineness is preferably from 5 to 235 dtex and the number of filaments is preferably from 1 to 144 in consideration of the use as a long fiber material for clothing.
- The core-sheath composite cross-section fiber of the present invention can be obtained by techniques such as melt spinning and composite spinning. Examples of the spinning technique are as follows. For example, a polyamide (sheath section) and a thermoplastic polymer having high moisture-absorbing capability (core section) are separately melted, and metered and transported with a gear pump, a composite flow is directly formed and discharged from a melt spinneret, and the obtained yarns are cooled to room temperature with a yarn cooling device such as a chimney, lubricated and bundled with a lubrication device, entangled with a first fluid entangling nozzle device, and stretched according to the ratio of the circumferential speed between a take-up roller and a stretching roller. Then, the yarns are heat-set with the stretching roller, and wound up with a winder (winding device) .
- In order to obtain the core-sheath composite cross-section fiber of the present invention, it is preferable to select a polyamide having an appropriate molecular structure, and to adopt a suitable take-up speed, a suitable lubrication position, and a suitable heat setting temperature after stretching. These will be described in detail below.
- As described above, the polyamide used in the sheath section of the core-sheath composite cross-section fiber of the present invention is a polyamide having a dicarboxylic acid unit having, as a main component, a sebacic acid unit, that is, a polymer made from a so-called high molecular weight material in which a hydrocarbon is linked to a main chain via an amide bond. Selecting a polyamide having a high capability of forming a hydrogen bond between amide bonds for the sheath section provides a core-sheath composite cross-section fiber in which a hydrogen bond between amide bonds in an amorphous part is hardly broken even at dyeing and drying at a high temperature exceeding 100°C, and which is reduced in changes in the fiber structure of the sheath section and excellent in wrinkle prevention of the fabric at dyeing. The "capability of forming a hydrogen bond between amide bonds" as used herein is determined by the degree of freedom of the main chain of the polyamide molecule, that is, the number of methylene groups per one amide bond. Therefore, selecting such a polyamide for the sheath section provides a core-sheath composite cross-section fiber excellent in wrinkle prevention of the fabric at dyeing.
- The polyamide used in the core-sheath composite cross-section fiber of the present invention may contain various additives, such as a matting agent, a flame retardant, an antioxidant, an ultraviolet absorber, an infrared absorber, a crystal nucleating agent, a fluorescent whitening agent, an antistatic agent, a hygroscopic polymer, and carbon in the form of a copolymer or a mixture as needed at a total additive content of 0.001 to 10% by weight.
- The polyamide chip used in the core-sheath composite cross-section fiber of the present invention preferably has a sulfuric acid relative viscosity of 2.30 to 3.30. A sulfuric acid relative viscosity within the above-mentioned range makes it possible to appropriately stretch the polyamide in the sheath section. When the sulfuric acid relative viscosity of the polyamide in the sheath section is 2.30 or more, a practically usable fiber strength and elongation is obtained. On the other hand, when the sulfuric acid relative viscosity is 3.30 or less, since the polyamide has a melt viscosity suitable for spinning, the stringing property during melt spinning is improved, and a fiber can be stably produced with no yarn breakage. The sulfuric acid relative viscosity is more preferably from 2.50 to 3.10.
- The proportion of the core section in the core-sheath composite cross-section fiber of the present invention is preferably from 20 parts by weight to 80 parts by weight to 100 parts by weight of the composite fiber. The proportion of the core section is more preferably from 30 parts by weight to 70 parts by weight. A proportion of the core section within the above-mentioned range makes it possible to appropriately stretch the polyamide in the sheath section. In addition, such a proportion gives high color fastness and moisture-absorbing capability.
- The temperature in the melting step is preferably from 250 to 290°C for the case of a polyhexamethylene sebacamide chip as the polyamide having a dicarboxylic acid unit having, as a main component, a sebacic acid unit used in the sheath section, and is preferably from 220 to 260°C for the case of "MH1657" manufactured by ARKEMA K.K. as the thermoplastic polymer having high moisture-absorbing capability used in the core section.
- In the take-up step, the take-up speed is preferably from 2500 to 3400 m/min. A take-up speed within the above-mentioned range makes the orientation crystallization of the core polymer moderately proceed and moderately suppress the crystallization of the core polymer, so that the stress per unit fineness during 3% elongation and the boiling-water shrinkage ratio can be controlled within preferable ranges, and the fiber is excellent in moisture-absorbing capability and wrinkle prevention, and can maintain the moisture-absorbing capability even after being washed. A take-up speed exceeding 3400 m/min makes the orientation crystallization of the polyamide in the sheath section proceed during stretching with spinning tension, but the α-crystal orientation parameter of the polyamide in the sheath section decreases, the rigidity of the sheath polymer decreases, and the fiber may be easily wrinkled due to a low mechanical stretch ratio. A take-up speed less than 2500 m/min provides a high mechanical stretch ratio, but due to insufficient stretching by the spinning tension, the α-crystal orientation parameter of the polyamide in the sheath section decreases, the rigidity of the sheath polymer decreases, and the fiber may be easily wrinkled. In addition, orientation crystallization of the core polymer proceeds, and the moisture-absorbing capability decreases. The take-up speed is more preferably from 2700 to 3200 m/min.
- In the lubricating step, the lubrication position is preferably at a position from 800 to 1500 mm from the lower surface of the spinneret. The polymer discharged from the spinneret is blown with cooling air from a cooling device to be solidified into yarns, and the yarns are stretched in the section from the solidification position to the lubrication position by spinning tension with accompanying flow, and then mechanically stretched between the take-up roller and the stretching roller. As for the core-sheath composite cross-section fiber of the present invention, it is important to increase the mechanical stretch ratio in order to promote the orientation crystallization of the sheath polymer to increase the rigidity, and to decrease the spinning tension in order to suppress the orientation crystallization of the core polymer to improve the moisture-absorbing capability. In other words, setting the lubrication position at a position within the above-mentioned range makes it possible to increase the stress per unit fineness during 3% elongation in a fiber tensile test, and to provide a fiber excellent in wrinkle prevention and moisture-absorbing capability. If the lubrication position is at a position less than 800 mm from the lower surface of the spinneret, the yarns are largely bent between the spinneret and the lubrication position, and an oil is supplied to the yarns in a state where the yarns are not sufficiently solidified, so that yarn breakage frequently occurs and the operability may be deteriorated. On the other hand, if the lubrication position is at a position more than 1500 mm from the lower surface of the spinneret, not only the orientation crystallization of the core polymer proceeds due to the high spinning tension to decrease the moisture-absorbing capability, but also the rigidity of the sheath polymer decreases, and the fiber may be easily wrinkled due to a low mechanical stretch ratio. The lubrication position is more preferably at a position from 1000 to 1300 mm from the lower surface of the spinneret.
- In the stretching step, the temperature of the heat setting after stretching is preferably from 165 to 180°C. The fiber oriented and crystallized by stretching between the rollers is further crystallized by the high-temperature heat setting treatment on a heating roller, so that the fiber structure is stabilized. The boiling-water shrinkage ratio depends on the shrinkage of the amorphous part of the fiber, that is, the proportion of the amorphous part. The "heat setting temperature" as used herein means the set temperature of the heating roller.
- The polymer having high moisture-absorbing capability in the core section, which constitutes the core-sheath composite cross-section fiber of the present invention, has high amorphous properties and high shrinkability. Therefore, a fiber made from only the single polymer is expected to have a large boiling-water shrinkage ratio. In view of the above, the core-sheath composite cross-section fiber of the present invention contains, as a sheath polymer, a polyamide having a dicarboxylic acid unit having, as a main component, a sebacic acid unit, which has relatively high rigidity and low shrinkability among polyamides, to impart rigidity to the sheath section and suppress the shrinkability of the core section. Moreover, heat setting at a temperature within the above-mentioned range after the stretching can stabilize the fiber structure, control the boiling-water shrinkage ratio within the range of 6.0 to 12.0%, and provide a fiber excellent in wrinkle prevention. If the heat setting temperature is lower than 165°C, the crystallization of the polyamide in the sheath section is insufficient, the fiber structure is not stabilized, and the fiber may be easily wrinkled. On the other hand, if the heat setting temperature exceeds 180°C, although a fiber excellent in wrinkle prevention can be obtained, contamination of the heating roller with a decomposition product of a spinning oil or the like is promoted, deterioration of the quality and breakage of the spun yarns occur frequently, the operability is deteriorated, and the fiber may be deteriorated in the process passability through higher order processing steps. The heat setting temperature is more preferably from 170 to 175°C.
- Since the core-sheath composite cross-section fiber of the present invention is excellent in moisture-absorbing capability, it is preferably used in clothing items, and the fabric form can be selected from a woven fabric, a knitted fabric, a nonwoven fabric and the like according to the purpose. As described above, the larger the ΔMR is, the higher the moisture-absorbing capability is, and a larger ΔMR corresponds to higher wearing comfort. Accordingly, a fabric including the core-sheath composite fiber of the present invention in at least a part thereof, which has a mixing ratio of the composite fiber of the present invention adjusted so that the ΔMR will be 5.0% or more, can provide clothing excellent in comfort. The clothing items may be various textile products such as underwear and sportswear.
- Hereinafter, the present invention will be described more specifically by way of examples. Measurement methods and the like of the characteristic values in the examples are as follows.
- A polyamide chip sample (1 g) was dissolved in 100 ml of sulfuric acid having a concentration of 98% by weight, and the flow time (T1) of the resulting solution at 25°C was measured with an Ostwald viscometer. Then, the flow time (T2) of sulfuric acid having a concentration of 98% by weight alone was measured. The ratio of T1 to T2, that is, T1/T2, was taken as the sulfuric acid relative viscosity.
- A polyether ester amide copolymer chip sample (1 g) was dissolved in 100 ml of ortho-chlorophenol, and the flow time (T1) of the resulting solution at 25°C was measured with an Ostwald viscometer. Then, the flow time (T2) of ortho-chlorophenol alone was measured. The ratio of T1 to T2, that is, T1/T2, was taken as the ortho-chlorophenol relative viscosity.
- A fiber sample was set on a sizing reel having a perimeter of 1.125 m, and rotated 200 times to make a looped skein. The skein was dried (105 ± 2°C × 60 minutes) with a hot air dryer, and the skein weight was measured with a scaling balance. The fineness based on corrected mass was calculated from the value obtained by multiplying the skein weight by the official regain.
- A fiber sample was measured with "TENSILON" (registered trademark) UCT-100 manufactured by ORIENTEC CORPORATION under the constant rate extension conditions shown in JIS L1013 (Chemical fiber filament yarn test method, 2010). The degree of elongation was determined from the elongation of a point showing the maximum strength in a tensile strength-elongation curve. The strength was a value obtained by dividing the maximum strength by the fineness based on corrected mass. The measurement was carried out 10 times, and the average values were taken as the strength and degree of elongation.
- A tensile test of a fiber sample was carried out by the method described in the item (4), and the strength at the point where the sample showed 3% elongation in the tensile strength-elongation curve was determined and taken as the stress during 3% elongation. The measurement was carried out 10 times, and the average value was taken as the stress during 3% elongation.
- A fiber sample was measured by laser Raman spectroscopy, and a ratio between the intensity ratio of Raman bands derived from a nylon α-crystal observed at around 1120 cm-1 in parallel polarization ((I1120) parallel) and the intensity ratio of Raman bands in vertical polarization ((I1120) vertical) was obtained as a parameter for the evaluation of orientation degree. Further, the scattering intensity under each polarization condition (parallel/vertical) was normalized on the basis of the Raman band intensity of the CH deformation band (around 1440 cm-1) having small anisotropy of orientation.
- The fiber sample for orientation measurement was embedded in a resin (bisphenol type epoxy resin, cured for 24 hours), and then sectioned with a microtome. The section had a thickness of 2.0 µm. The section sample was cut slightly inclined from the fiber axis so that the cut face would have an elliptical shape, and the portion where the thickness of the minor axis of the ellipse was constant was selected and measured. The measurement was performed in the microscopic mode, and the spot diameter of the laser at the sample position was 1 µm. The orientation of the centers of the core and sheath layers was analyzed, and the orientation was measured under polarization conditions. The orientation degree was evaluated based on the ratio between the Raman band intensities obtained under a parallel condition in which the polarization direction coincided with the fiber axis and a vertical condition in which the polarization direction was orthogonal to the fiber axis. The measurement was performed 3 times for each measurement point, and the average thereof was used. Detailed conditions are shown below.
-
- Laser Raman spectroscopy
- Apparatus: T-64000 (Jobin Yvon/Atago Bussan Co., Ltd.)
- Conditions: measurement mode; micro Raman
- Objective lens: ×100
- Beam diameter: 1 µm
- Light source: Ar+ laser/514.5 nm
- Laser power: 50 mW
- Diffraction grating: Single 600 gr/mm
- Slit: 100 µm
- Detector: CCD/Jobin Yvon 1024 × 256
- The boiling-water shrinkage ratio was measured according to JIS L1013: 2010 8.18.1 (method B).
- The core-sheath composite cross-section fiber of the present invention was used as the warp and the weft. At a warp density of 188 yarns/2.54 cm and a weft density of 155 yarns/2.54 cm, the fiber was woven into a flat structure with a water jet loom.
- According to a conventional method, the resulting gray fabric was scoured with an open soaper in a solution containing 2 g of caustic soda (NaOH) per liter, dried in a cylinder dryer at 120°C, and then preset at 170°C. Then, the gray fabric was heated to 120°C at a rate of 2.0°C/min in a pressure-resistant drum type dyeing machine, and dyed at a set temperature of 120°C for 60 minutes. After the dyeing, the fabric was washed with running water for 20 minutes, and dehydrated and dried to give a woven fabric having a warp density of 200 yarns/2.54 cm and a weft density of 160 yarns/2.54 cm.
- The woven fabric obtained in the item (8) was subjected to the method described in paragraph 9 of JIS L1059-2 (Testing methods for crease recovery of textiles - Part 2: Evaluation of the wrinkle recovery of fabrics (wrinkle method), 2009), and the wrinkle prevention was judged as Grade 5 (the most smooth appearance) to Grade 1 (the most wrinkly appearance) . When the fabric was judged as Grade 3 or higher, the fabric was judged as being excellent in wrinkle prevention.
- The woven fabric obtained in the item (8) (about 1 to 2 g) was weighed in a weighing bottle, held at 110°C for 2 hours to dry, and the weight (W0) was measured. Then, a target substance was held at 20°C and a relative humidity of 65% for 24 hours, and then the weight (W65) was measured. Then, the target substance was held at 30°C and a relative humidity of 90% for 24 hours, and then the weight (W90) was measured. Then, the ΔMR was calculated according to the following formulae.
- The woven fabric obtained in the item (8) was repeatedly subjected to 20 times of washing by the method described in No. 103 in the attached table 1 of JIS L0217 (1995), and then the ΔMR described in the item (10) was calculated.
- When the ΔMR was 5.0% or more, the woven fabric was judged to give high wearing comfort.
-
- When the ΔMR retention rate was 90% or more, the fabric was judged as having washing durability.
- Using the core-sheath composite cross-section fiber of the present invention, 10 pieces (1000 m/piece) of plain weave fabrics were woven with a water jet loom at a loom rotation speed of 750 rpm and a weft length of 1620 mm. The number of stoppage of the loom due to yarn breakage during the weaving was evaluated. When the number of yarn breakage was 2 times or less, the fiber was judged to be good in process passability.
- A polyether ester amide copolymer (MH1657 manufactured by ARKEMA K.K. (chip ΔMR: 18.9)) having an ortho-chlorophenol relative viscosity of 1.69 as a core section, and nylon 610 having a sulfuric acid relative viscosity of 2.72 as a sheath section were melted at 270°C, and spun from a concentric core-sheath composite spinneret so that the core/sheath ratio (parts by weight) would be 50/50.
- In this process, the rotation speed of the gear pump was selected so that the obtained core-sheath composite yarn would have a total fineness of 56 dtex, and the polymers were each discharged at 22 g/min. Then, the yarns were cooled and solidified with a yarn cooling device, and an anhydrous oil was supplied with a lubrication device from a lubrication position at a position of 1000 mm from the lower surface of the spinneret. Then, the yarns were entangled with a first fluid entangling nozzle device, stretched at a circumferential speed of a take-up roller as a first roll of 2800 m/min and a stretch ratio between the take-up roller and a stretching roller of 1.50 times, and heat-set at a set temperature of the stretching roller of 170°C. Then, the yarns were wound up at a winding speed of 4000 m/min to give a core-sheath composite cross-section fiber of 56 dtex/24 filaments.
- For the obtained core-sheath composite cross-section fiber, the fineness, strength, degree of elongation, stress per unit fineness during 3% elongation, boiling-water shrinkage ratio, retention rate of stress per unit fineness during 3% elongation before and after boiling water treatment, and α-crystal orientation parameter were measured. The obtained woven fabric was evaluated for wrinkle prevention, ΔMR, ΔMR after washing, and ΔMR retention rate after washing. The results are shown in Table 1.
- A core-sheath composite cross-section fiber of 56 dtex/24 filaments was obtained in the same manner as in Example 1 except that the heat setting temperature of the heating roller was 180°C.
- For the obtained core-sheath composite cross-section fiber, the fineness, strength, degree of elongation, stress per unit fineness during 3% elongation, boiling-water shrinkage ratio, retention rate of stress during 3% elongation before and after boiling water treatment, and α-crystal orientation parameter were measured. The obtained woven fabric was evaluated for wrinkle prevention, ΔMR, ΔMR after washing, and ΔMR retention rate after washing. The results are shown in Table 1.
- A core-sheath composite cross-section fiber of 56 dtex/24 filaments was obtained in the same manner as in Example 1 except that the heat setting temperature of the heating roller was 165°C.
- For the obtained core-sheath composite cross-section fiber, the fineness, strength, degree of elongation, stress per unit fineness during 3% elongation, boiling-water shrinkage ratio, retention rate of stress during 3% elongation before and after boiling water treatment, and α-crystal orientation parameter were measured. The obtained woven fabric was evaluated for wrinkle prevention, ΔMR, ΔMR after washing, and ΔMR retention rate after washing. The results are shown in Table 1.
- A core-sheath composite cross-section fiber of 56 dtex/24 filaments was obtained in the same manner as in Example 1 except that the lubrication position was at a position of 1500 mm from the lower surface of the spinneret, and the yarns were wound up at a winding speed of 3900 m/min.
- For the obtained core-sheath composite cross-section fiber, the fineness, strength, degree of elongation, stress per unit fineness during 3% elongation, boiling-water shrinkage ratio, retention rate of stress during 3% elongation before and after boiling water treatment, and α-crystal orientation parameter were measured. The obtained woven fabric was evaluated for wrinkle prevention, ΔMR, ΔMR after washing, and ΔMR retention rate after washing. The results are shown in Table 1.
- A core-sheath composite cross-section fiber of 56 dtex/24 filaments was obtained in the same manner as in Example 1 except that the lubrication position was at a position of 800 mm from the lower surface of the spinneret.
- For the obtained core-sheath composite cross-section fiber, the fineness, strength, degree of elongation, stress per unit fineness during 3% elongation, boiling-water shrinkage ratio, retention rate of stress during 3% elongation before and after boiling water treatment, and α-crystal orientation parameter were measured. The obtained woven fabric was evaluated for wrinkle prevention, ΔMR, ΔMR after washing, and ΔMR retention rate after washing. The results are shown in Table 1.
- A core-sheath composite cross-section fiber of 56 dtex/24 filaments was obtained in the same manner as in Example 1 except that the lubrication position was at a position of 1500 mm from the lower surface of the spinneret, the stretch ratio between the take-up roller and the stretching roller was 1.45 times, and the yarns were wound up at a winding speed of 3900 m/min.
- For the obtained core-sheath composite cross-section fiber, the fineness, strength, degree of elongation, stress per unit fineness during 3% elongation, boiling-water shrinkage ratio, retention rate of stress during 3% elongation before and after boiling water treatment, and α-crystal orientation parameter were measured. The obtained woven fabric was evaluated for wrinkle prevention, ΔMR, ΔMR after washing, and ΔMR retention rate after washing. The results are shown in Table 1.
- A core-sheath composite cross-section fiber of 56 dtex/24 filaments was obtained in the same manner as in Example 1 except that the lubrication position was at a position of 800 mm from the lower surface of the spinneret, the stretch ratio between the take-up roller and the stretching roller was 1.55 times, and the yarns were wound up at a winding speed of 4100 m/min.
- For the obtained core-sheath composite cross-section fiber, the fineness, strength, degree of elongation, stress per unit fineness during 3% elongation, boiling-water shrinkage ratio, retention rate of stress during 3% elongation before and after boiling water treatment, and α-crystal orientation parameter were measured. The obtained woven fabric was evaluated for wrinkle prevention, ΔMR, ΔMR after washing, and ΔMR retention rate after washing. The results are shown in Table 1.
- A core-sheath composite cross-section fiber of 56 dtex/24 filaments was obtained in the same manner as in Example 1 except that the circumferential speed of the take-up roller as a first roll was 2500 m/min, the stretch ratio between the take-up roller and the stretching roller was 1.65 times, and the yarns were wound up at a winding speed of 3900 m/min.
- For the obtained core-sheath composite cross-section fiber, the fineness, strength, degree of elongation, stress per unit fineness during 3% elongation, boiling-water shrinkage ratio, retention rate of stress during 3% elongation before and after boiling water treatment, and α-crystal orientation parameter were measured. The obtained woven fabric was evaluated for wrinkle prevention, ΔMR, ΔMR after washing, and ΔMR retention rate after washing. The results are shown in Table 1.
- A core-sheath composite cross-section fiber of 56 dtex/24 filaments was obtained in the same manner as in Example 1 except that the circumferential speed of the take-up roller as a first roll was 3400 m/min, the stretch ratio between the take-up roller and the stretching roller was 1.20 times, and the yarns were wound up at a winding speed of 3900 m/min.
- For the obtained core-sheath composite cross-section fiber, the fineness, strength, degree of elongation, stress per unit fineness during 3% elongation, boiling-water shrinkage ratio, retention rate of stress during 3% elongation before and after boiling water treatment, and α-crystal orientation parameter were measured. The obtained woven fabric was evaluated for wrinkle prevention, ΔMR, ΔMR after washing, and ΔMR retention rate after washing. The results are shown in Table 1.
- A core-sheath composite cross-section fiber of 56 dtex/24 filaments was obtained in the same manner as in Example 1 except that the heat setting temperature of the heating roller was 190°C.
- For the obtained core-sheath composite cross-section fiber, the fineness, strength, degree of elongation, stress per unit fineness during 3% elongation, boiling-water shrinkage ratio, retention rate of stress during 3% elongation before and after boiling water treatment, and α-crystal orientation parameter were measured. The obtained woven fabric was evaluated for wrinkle prevention, ΔMR, ΔMR after washing, and ΔMR retention rate after washing. The results are shown in Table 2.
- At this level in which the heat setting temperature of the heating roller was high, the fiber was excellent in moisture-absorbing capability and wrinkle prevention, and maintained moisture-absorbing capability even after being washed. However, contamination of the heating roller with a decomposition product of a spinning oil or the like was promoted, yarn breakage in the higher order processing steps occurred frequently, and the fiber was poor in the process passability.
- A core-sheath composite cross-section fiber of 56 dtex/24 filaments was obtained in the same manner as in Example 1 except that the set temperature of the stretching roller was 150°C.
- For the obtained core-sheath composite cross-section fiber, the fineness, strength, degree of elongation, stress per unit fineness during 3% elongation, boiling-water shrinkage ratio, retention rate of stress during 3% elongation before and after boiling water treatment, and α-crystal orientation parameter were measured. The obtained woven fabric was evaluated for wrinkle prevention, ΔMR, ΔMR after washing, and ΔMR retention rate after washing. The results are shown in Table 2.
- At this level in which the heat setting temperature of the heating roller was low, the balance of shrinkage characteristics between nylon 610 in the sheath section and the polyether ester amide copolymer in the core section was disrupted, the boiling-water shrinkage ratio was as high as 15.0%, and the woven fabric was wrinkled.
- A core-sheath composite cross-section fiber of 56 dtex/24 filaments was obtained in the same manner as in Example 1 except that the lubrication position was at a position of 1800 mm from the lower surface of the spinneret, the stretch ratio between the take-up roller and the stretching roller was 1.30 times, and the yarns were wound up at a winding speed of 3500 m/min.
- For the obtained core-sheath composite cross-section fiber, the fineness, strength, degree of elongation, stress per unit fineness during 3% elongation, boiling-water shrinkage ratio, retention rate of stress during 3% elongation before and after boiling water treatment, and α-crystal orientation parameter were measured. The obtained woven fabric was evaluated for wrinkle prevention, ΔMR, ΔMR after washing, and ΔMR retention rate after washing. The results are shown in Table 2.
- At this level in which the distance between the lower surface of the spinneret and the lubrication position was long, the rigidity of nylon 610 in the sheath section was low, the balance of shrinkage characteristics between nylon 610 in the sheath section and the polyether ester amide copolymer in the core section was disrupted, the stress per unit fineness during 3% elongation was as low as 0.58 cN/dtex, and the woven fabric was wrinkled.
- A core-sheath composite cross-section fiber of 56 dtex/24 filaments was obtained in the same manner as in Example 1 except that the circumferential speed of the take-up roller as a first roll was 2200 m/min, the stretch ratio between the take-up roller and the stretching roller was 1.80 times, and the yarns were wound up at a winding speed of 3800 m/min.
- For the obtained core-sheath composite cross-section fiber, the fineness, strength, degree of elongation, stress per unit fineness during 3% elongation, boiling-water shrinkage ratio, retention rate of stress during 3% elongation before and after boiling water treatment, and α-crystal orientation parameter were measured. The obtained woven fabric was evaluated for wrinkle prevention, ΔMR, ΔMR after washing, and ΔMR retention rate after washing. The results are shown in Table 2.
- At this level in which the take-up speed was low, the rigidity of nylon 610 in the sheath section was low, the balance of shrinkage characteristics between nylon 610 in the sheath section and the polyether ester amide copolymer in the core section was disrupted, the boiling-water shrinkage ratio was 12.3%, and the woven fabric was wrinkled.
- A core-sheath composite cross-section fiber of 56 dtex/24 filaments was obtained in the same manner as in Example 1 except that the circumferential speed of the take-up roller as a first roll was 3700 m/min, the stretch ratio between the take-up roller and the stretching roller was 1.05 times, and the yarns were wound up at a winding speed of 3700 m/min.
- For the obtained core-sheath composite cross-section fiber, the fineness, strength, degree of elongation, stress per unit fineness during 3% elongation, boiling-water shrinkage ratio, retention rate of stress during 3% elongation before and after boiling water treatment, and α-crystal orientation parameter were measured. The obtained woven fabric was evaluated for wrinkle prevention, ΔMR, ΔMR after washing, and ΔMR retention rate after washing. The results are shown in Table 2.
- At this level in which the take-up speed was high, the rigidity of nylon 610 in the sheath section was low, the balance of shrinkage characteristics between nylon 610 in the sheath section and the polyether ester amide copolymer in the core section was disrupted, the stress per unit fineness during 3% elongation was as low as 0.54 cN/dtex, the woven fabric was wrinkled, yarn breakage in the higher order processing steps occurred frequently, and the fiber was poor in the process passability.
- A core-sheath composite cross-section fiber of 56 dtex/24 filaments was obtained in the same manner as in Example 1 except that nylon 6 having a sulfuric acid relative viscosity of 2.40 was used in the sheath section, and the heat setting temperature of the heating roller was 150°C.
- For the obtained core-sheath composite cross-section fiber, the fineness, strength, degree of elongation, stress per unit fineness during 3% elongation, boiling-water shrinkage ratio, retention rate of stress during 3% elongation before and after boiling water treatment, and α-crystal orientation parameter were measured. The obtained woven fabric was evaluated for wrinkle prevention, ΔMR, ΔMR after washing, and ΔMR retention rate after washing. The results are shown in Table 2.
- At this level in which the polyamide in the sheath section was nylon 6, the rigidity of nylon 6 in the sheath section was low, the balance of shrinkage characteristics between nylon 6 in the sheath section and the polyether ester amide copolymer in the core section was disrupted, the stress per unit fineness during 3% elongation was as low as 0.53 cN/dtex, and the woven fabric was wrinkled.
[Table 1] Example 1 Example 2 Example 3 Example 4 Example 5 Example 6 Example 7 Example 8 Example 9 Core component Polymer Polyether ester amide copolymer Polyether ester amide copolymer Polyether ester amide copolymer Polyether ester amide copolymer Polyether ester amide copolymer Polyether ester amide copolymer Polyether ester amide copolymer Polyether ester amide copolymer Polyether ester amide copolymer OCP relative viscosity 1.69 1.69 1.69 1.69 1.69 1.69 1.69 1.69 1.69 Sheath component Polymer Nylon 610 Nylon 610 Nylon 610 Nylon 610 Nylon 610 Nylon 610 Nylon 610 Nylon 610 Nylon 610 Sulfuric acid relative viscosity 2.72 2.72 2.72 2.72 2.72 2.72 2.72 2.72 2.72 Yarn making conditions Take-up speed (m/min) 2,800 2,800 2,800 2,800 2,800 2,800 2,800 2,500 3,400 Stretch ratio 1.50 1.50 1.50 1.50 1.50 1.45 1.55 1.65 1.20 Winding speed (m/min) 4,000 4,000 4,000 3,900 4,000 3,900 4,100 3,900 3,900 Lubrication position (mm) 1,000 1,000 1,000 1,500 800 1,500 800 1,000 1,000 Heat setting temperature (°C) 170 180 165 170 170 170 170 170 170 Mechanical characteristics of fiber Fineness (dtex) 56 56 56 56 56 56 56 56 56 Strength (cN/dtex) 3.6 3.7 3.5 3.6 3.6 3.2 3.0 3.8 3.5 Degree of elongation (%) 43 39 45 39 48 46 42 44 44 Boiling-water shrinkage ratio (%) 9.8 6.1 11.8 9.7 9.8 10.0 9.7 10.5 9.0 Stress during 3% elongation (cN/dtex) 0.82 0.83 0.79 0.81 0.82 0.72 0.85 0.86 0.67 Stress during 3% elongation (cN/dtex) after boiling water treatment 0.60 0.59 0.51 0.59 0.59 0.51 0.62 0.59 0.99 Retention rate of stress during 3% elongation (%) after boiling water treatment 73 71 65 73 72 71 73 69 73 α-Cryatal orientation parameter 2.53 2.60 2.45 2.50 2.56 2.39 2.69 2.10 2.70 Process passability through higher order processing steps Yarn breakage (times) 1 2 1 1 1 1 2 1 2 Evaluation of fabric Wrinkle prevention 5 5 3 5 5 4 5 3 4 ΔMR (%) 10.2 10.3 10.0 9.8 10.4 9.6 11.0 9.5 10.7 ΔMR after washing (%) 10.1 10.2 9.8 9.5 10.3 9.2 10.9 9.1 10.6 ΔMR retention rate after washing (%) 99 99 98 97 99 96 99 96 99 [Table 2] Comparative Example 1 Comparative Example 2 Comparative Example 3 Comparative Example 4 Comparative Example 5 Comparative Example 6 Core component Polymer Polyether ester amide copolymer Polyether ester amide copolymer Polyether ester amide copolymer Polyether ester amide copolymer Polyether ester amide copolymer Polyether ester amide copolymer OCP relative viscosity 1.69 1.69 1.69 1.69 1.69 1.69 Sheath component Polymer Nylon 610 Nylon 610 Nylon 610 Nylon 610 Nylon 610 Nylon 6 Sulfuric acid relative viscosity 2.72 2.72 2.72 2.72 2.72 2.40 Yarn making conditions Take-up speed (m/min) 2,800 2,800 2,800 2,200 3,700 2,800 Stretch ratio 1.50 1.50 1.30 1.80 1.05 1.50 Winding speed (m/min) 4,000 4,000 3,500 3,800 3,700 4,000 Lubrication position (mm) 1,000 1,000 1,800 1,000 1,000 1,000 Heat setting temperature (°C) 190 150 170 170 170 150 Mechanical characteristics of fiber Fineness (dtex) 56 56 56 56 56 56 Strength (cN/dtex) 3.8 3.2 3.0 4.0 3.3 3.2 Degree of elongation (%) 36 48 50 43 45 45 Boiling-water shrinkage ratio (%) 4.8 15.0 10.3 12.3 8.7 16.3 Stress during 3% elongation (cN/dtex) 0.83 0.79 0.58 0.58 0.54 0.53 Stress during 3% elongation (cN/dtex) after boiling water treatment 0.60 0.52 0.40 0.40 0.38 0.28 Retention rate of stress during 3% elongation (%) after boiling water treatment 72 66 69 69 70 53 α-Crystal orientation parameter 2.72 2.25 2.20 1.80 2.05 2.12 Process passability through higher order processing steps Yarn breakage (times) 16 1 2 1 10 1 Evaluation of fabric Wrinkle prevention 5 2 2 2 2 2 ΔMR (%) 10.3 10.0 9.5 8.5 11.0 12.2 ΔMR after washing (%) 10.2 9.8 9.2 7.8 10.9 12.1 ΔMR retention rate after washing (%) 99 98 97 92 99 99
Claims (5)
- A core-sheath composite cross-section fiber, comprising:a thermoplastic polymer as a core polymer; and a polyamide having a dicarboxylic acid unit having, as a main component,a sebacic acid unit as a sheath polymer, the core-sheath composite cross-section fiber having a ΔMR of 5.0% or more, a ΔMR retention rate after 20 times of washing of 90% or more and 100% or less, a boiling-water shrinkage ratio of 6.0 to 12.0%, and a stress per unit fineness during 3% elongation in a fiber tensile test of 0.60 cN/dtex or more, wherein the thermoplastic polymer is a polyether ester amide copolymer, wherein the ΔMR, the ΔMR retention rate after 20 times of washing, the boiling-water shrinkage ratio, and the stress per unit fineness during 3% elongation are measured as described in the description.
- The core-sheath composite cross-section fiber according to claim 1, wherein a sheath section has an α-crystal orientation parameter of 2.10 to 2.70, wherein the α-crystal orientation parameter is measured as described in the description.
- The core-sheath composite cross-section fiber according to claim 1 or 2, having a retention rate of stress per unit fineness during 3% elongation in a fiber tensile test of 60% or more before and after boiling water treatment.
- A fabric comprising the core-sheath composite cross-section fiber according to any one of claims 1 to 3 in at least a part thereof.
- A textile product comprising the core-sheath composite cross-section fiber according to any one of claims 1 to 3 in at least a part thereof.
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PCT/JP2016/082368 WO2017082110A1 (en) | 2015-11-10 | 2016-11-01 | Core-sheath composite cross-section fiber having excellent moisture absorbency and wrinkle prevention |
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EP (1) | EP3375918B1 (en) |
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CN (1) | CN108138378B (en) |
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JPS5145687B2 (en) * | 1973-09-04 | 1976-12-04 | ||
JP3144092B2 (en) * | 1992-10-26 | 2001-03-07 | 東レ株式会社 | Core-sheath type composite fiber with excellent hygroscopicity |
JP3297492B2 (en) * | 1993-04-23 | 2002-07-02 | 旭化成株式会社 | Sheath-core type composite fiber |
JPH0941221A (en) * | 1995-07-28 | 1997-02-10 | Toray Ind Inc | Synthetic fiber excellent in comfortableness |
JP2001159030A (en) * | 1999-11-29 | 2001-06-12 | Toray Ind Inc | Conjugate polyamide fiber |
JP2002088577A (en) * | 2000-09-13 | 2002-03-27 | Toray Ind Inc | Polyamide fiber and method of producing the same and use thereof |
TW567258B (en) * | 2000-09-29 | 2003-12-21 | Du Pont | Stretchable polymeric fibers and articles produced therefrom |
EP1939336B1 (en) * | 2005-10-19 | 2012-06-13 | Toray Industries, Inc. | Crimped yarn, method for manufacture thereof, and fiber structure |
CN101313091A (en) * | 2005-10-19 | 2008-11-26 | 东丽株式会社 | Crimped yarn, method for manufacture thereof, and fiber structure |
JP4872339B2 (en) * | 2005-12-26 | 2012-02-08 | 東レ株式会社 | Core-sheath type composite fiber, crimped yarn, and fiber structure using them |
TW200741049A (en) * | 2005-12-27 | 2007-11-01 | Shell Int Research | Polyester yarn and process for producing |
JP2007321295A (en) * | 2006-06-01 | 2007-12-13 | Teijin Ltd | Crimped conjugated fiber |
DE602007008568D1 (en) * | 2006-07-03 | 2010-09-30 | Kuraray Co | CONDUCTIVE COVER CORE CONJUGATE FIBER AND METHOD OF MANUFACTURING THEREOF |
KR101440983B1 (en) | 2007-04-04 | 2014-09-17 | 케이비 세렌 가부시키가이샤 | Conjugated fiber excellent in antistatic property, moisture absorption and cool touch feeling |
JP2011200352A (en) * | 2010-03-25 | 2011-10-13 | Toray Monofilament Co Ltd | Tapered bristle and brush |
JP5807456B2 (en) * | 2011-08-31 | 2015-11-10 | 東レ株式会社 | Polyamide 410 fiber and fiber structure comprising the same |
TWI595127B (en) * | 2012-02-29 | 2017-08-11 | 東麗股份有限公司 | Polyamide fiber and method for producing the same |
US20150159303A1 (en) | 2012-07-12 | 2015-06-11 | Kb Seiren, Ltd. | Core-Sheath Conjugated Fiber |
US10316439B2 (en) * | 2014-02-26 | 2019-06-11 | Toray Industries, Inc. | Crimped polyamide yarn, and woven or knit fabric employing same |
JP2016204784A (en) * | 2015-04-23 | 2016-12-08 | 東レ株式会社 | Polyamide core-sheath composite fiber excellent in hygroscopicity and contact cool feeling and fabric using the same |
JP6600969B2 (en) * | 2015-04-02 | 2019-11-06 | 東レ株式会社 | Core-sheath composite cross-section fiber with excellent moisture absorption / release performance |
CA2986887A1 (en) * | 2015-05-22 | 2016-12-01 | Toray Industries, Inc. | Hygroscopic core-sheath conjugate yarn and production method therefor |
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2016
- 2016-11-01 KR KR1020187006770A patent/KR102575877B1/en active IP Right Grant
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- 2016-11-01 US US15/774,021 patent/US20190024264A1/en not_active Abandoned
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- 2016-11-01 EP EP16864073.8A patent/EP3375918B1/en active Active
- 2016-11-01 AU AU2016351997A patent/AU2016351997B2/en active Active
- 2016-11-08 TW TW105136261A patent/TW201734273A/en unknown
Also Published As
Publication number | Publication date |
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CN108138378B (en) | 2020-07-28 |
KR102575877B1 (en) | 2023-09-07 |
EP3375918A4 (en) | 2019-06-26 |
JPWO2017082110A1 (en) | 2017-11-16 |
AU2016351997A1 (en) | 2018-05-17 |
CN108138378A (en) | 2018-06-08 |
KR20180079288A (en) | 2018-07-10 |
EP3375918A1 (en) | 2018-09-19 |
CA3003107A1 (en) | 2017-05-18 |
AU2016351997B2 (en) | 2020-07-30 |
WO2017082110A1 (en) | 2017-05-18 |
JP6213693B2 (en) | 2017-10-18 |
TW201734273A (en) | 2017-10-01 |
US20190024264A1 (en) | 2019-01-24 |
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