JP2019099986A - Composite fiber and fiber structure thereof - Google Patents

Abstract

To provide a composite fiber having both properties of a polyolefin and a polyester, an excellent physical property and abrasion resistance, suppressed formation of peeling and fuzz, and suitable to be employed as a fiber structure.SOLUTION: The composite fiber comprises a polyolefin (A) and a polyester (B), wherein the composite fiber is characterized by containing a styrene-ethylene-butylene-styrene copolymer (C) and/or a styrene- butadiene-butylene-styrene.SELECTED DRAWING: None

Description

  The present invention relates to a composite fiber. More specifically, the present invention relates to a composite fiber which has properties of polyolefin and polyester, is excellent in mechanical properties and abrasion resistance, and is suppressed from peeling and fluff generation, and can be suitably employed as a fiber structure.

  Polyolefins are excellent in lightness, abrasion resistance, heat retention, water repellency and the like, and polyesters are excellent in heat resistance, mechanical properties, dyeability, chemical resistance and the like, so both polyolefin and polyester are molded articles such as fibers and films. Widely used as a raw material for

  A composite fiber obtained by combining different polymers is an effective method for developing new materials because it can take advantage of the advantages of the respective polymers and compensate for the disadvantages. However, when the compatibility between the polymers to be combined is low, that is, when the interfacial adhesion is low, interfacial peeling occurs, which causes problems such as a decrease in mechanical properties and wear resistance. Therefore, it is necessary to improve the compatibility in the composite fiber of polymers having low compatibility.

  For example, in Patent Document 1, a technique is proposed in which composite fibers made of polyester and polypropylene are made into a fabric, and then physical processing such as high-pressure liquid flow injection is performed to divide the composite fibers to obtain ultrafine fibers. ing.

  Moreover, in patent document 2, the technique which provides crimpability is proposed by heat-processing to the eccentric core-sheath type composite fiber which a core becomes from polytrimethylene terephthalate and a sheath becomes from polyolefin.

Japanese Patent Laid-Open No. 6-228822 JP 2003-3334 A

  In the method described in Patent Document 1, the main purpose is to physically separate the composite fiber made of polyester and polypropylene for interfacial peeling to obtain an ultrafine fiber, and the compatibility between polyester and polypropylene is low. We are actively using it.

  On the other hand, in the method described in Patent Document 2, the compatibility between the core polytrimethylene terephthalate and the sheath polyolefin is low, that is, the interfacial adhesion is low, so the mechanical properties and the abrasion resistance of the eccentric core-sheath composite fiber are low. And staining spots were also seen and needed improvement.

  The object of the present invention is to solve the above-mentioned problems of the prior art and to combine the properties of polyolefin and polyester, and to be excellent in mechanical properties and wear resistance, and to suppress the occurrence of peeling and fuzz, and to obtain a fiber structure It is an object of the present invention to provide a composite fiber which can be suitably employed as

  The above-mentioned object of the present invention is a composite fiber comprising polyolefin (A) and polyester (B), which comprises styrene-ethylene-butylene-styrene copolymer (C) and / or styrene-butadiene-butylene-styrene copolymer It can be solved by a composite fiber characterized in that it contains coalescing (C ').

  Also, styrene-ethylene-butylene-styrene copolymer (C) and / or styrene based on 100 parts by weight in total of polyolefin (A), polyester (B) and styrene-ethylene-butylene-styrene copolymer (C) It is preferable to contain 0.1-30.0 weight part of-butadiene-butylene-styrene copolymer (C ').

  Furthermore, the styrene-ethylene-butylene-styrene copolymer (C) contains 15.0 to 45.0 parts by weight of a styrene block (C1), and the weight of ethylene block (C2) and butylene block (C3) The ratio (C2 / C3) is 0.1 to 1.0, having at least one functional group selected from an acid anhydride group, an amino group and an imino group, a styrene-butadiene-butylene-styrene copolymer The polymer (C ') contains 15.0 to 45.0 parts by weight of a styrene block (C'1), and a weight ratio (C') of a butadiene block (C'2) and a butylene block (C'3) It can be suitably adopted that 2 / C'3) is 0.1 to 1.0 and that it has at least one functional group selected from an acid anhydride group, an amino group and an imino group.

  The main components of the polyester (B) are a dicarboxylic acid component (B1) and a diol component (B2), and an aliphatic dicarboxylic acid (B1-1), an alicyclic dicarboxylic acid (B1-2) and an aromatic dicarbon Selected from at least one dicarboxylic acid component (B1) selected from acid (B1-3), aliphatic diol (B2-1), alicyclic diol (B2-2) and aromatic diol (B2-3) Preferably, it is at least one diol component (B2). Moreover, it can also be suitably adopted that the main component of the polyester (B) is any one selected from an aliphatic oxycarboxylic acid, an alicyclic oxycarboxylic acid and an aromatic oxycarboxylic acid.

  The cross-sectional composite form of the composite fiber is preferably any one selected from a core-sheath type, an eccentric core-sheath type, a multiple core-sheath type, a sea-island type, a side-by-side type, and a multilayer bonding type.

  Moreover, it can employ | adopt suitably for the fiber structure characterized by using said composite fiber at least in part.

  ADVANTAGE OF THE INVENTION According to this invention, while having the characteristic of polyolefin and polyester, while being excellent in a mechanical characteristic and abrasion resistance, the composite fiber in which peeling and generation | occurrence | production of the fluff were suppressed can be provided. The composite fiber obtained by the present invention can be suitably used as a fiber structure in applications where conventional polyolefin fibers and polyester fibers are used, particularly in applications where high quality is required.

(A)-(n) of FIG. 1 is a figure which shows an example of the cross-section composite form of the composite fiber of this invention.

  The composite fiber of the present invention is a composite fiber composed of polyolefin (A) and polyester (B), and is a styrene-ethylene-butylene-styrene copolymer (C) and / or a styrene-butadiene-butylene-styrene copolymer (C ') is contained.

  The composite fiber in the present invention melts polyolefin (A) and polyester (B) separately when melt spinning (polyolefin (A) and / or polyester (B) is a styrene-ethylene-butylene-styrene copolymer. Polymer (C) and / or Styrene-Butadiene-Butylene-Styrene Copolymer (C ') may be used) Cross-section composite form using a composite spinneret such as core-sheath type or sea-island type Are fibers obtained by forming That is, at any stage before melt spinning is completed, polyolefin (A), polyester (B), styrene-ethylene-butylene-styrene copolymer (C) and / or styrene-butadiene-butylene-styrene copolymer The polymer alloy fiber obtained from the polymer alloy composition formed by kneading (C ′) is essentially different.

  As described in the background art, polyolefins are excellent in lightness, abrasion resistance, heat retention, water repellency and the like, and polyesters are excellent in heat resistance, mechanical properties, dyeability, chemical resistance and the like. Therefore, the composite fiber of the present invention obtained by the composite of the polyolefin (A) and the polyester (B) has both the advantages of the polyolefin and the polyester. As a result of intensive studies on the improvement of the compatibility between the polyolefin (A) and the polyester (B), which were the conventional problems, the present inventors have studied styrene-ethylene-butylene-styrene copolymer (C) and / or styrene-butadiene. It has been found that when the -butylene-styrene copolymer (C ') is used as a compatibilizer, the compatibility is dramatically improved. As a result, the mechanical properties and the wear resistance were improved, and the generation of peeling and fluff was successfully suppressed. Furthermore, since interfacial peeling between the polyolefin (A) and the polyester (B) is suppressed, when dyed, it is possible to suppress a decrease in color developability due to an increase in scattered light due to interfacial peeling, It made it possible to obtain clear and deep color development.

  Examples of the polyolefin (A) in the present invention include, but are not limited to, polyethylene, polypropylene, polybutene-1, and polymethylpentene. Among them, polypropylene is preferable because it is excellent in molding processability and excellent in mechanical characteristics, and polymethylpentene is preferable because it has a high melting point, excellent heat resistance, and the lowest specific gravity among polyolefins and excellent in lightness. . For clothing applications, polypropylene can be particularly suitably employed.

  The polyolefin (A) of the present invention may be a homopolymer or a copolymer with another α-olefin. Other α-olefins (hereinafter sometimes simply referred to as α-olefins) may be copolymerized with one or more kinds.

  The carbon number of the α-olefin is preferably 2 to 20, and the molecular chain of the α-olefin may be linear or branched. Specific examples of α-olefins include ethylene, propylene, 1-butene, 1-pentene, 1-hexene, 1-octene, 1-decene, 1-dodecene, 1-tetradecene, 1-hexadecene, 1-octadecene, 1-ocdecene Examples include, but are not limited to, eicosene, 3-methyl-1-butene, 3-methyl-1-pentene, 3-ethyl-1-pentene, 3-ethyl-1-hexene and the like.

  It is preferable that the copolymerization rate of an alpha olefin is 20 mol% or less. If the copolymerization ratio of the α-olefin is 20 mol% or less, it is preferable because composite fibers having good mechanical properties and heat resistance can be obtained. The copolymerization ratio of the α-olefin is more preferably 15 mol% or less, still more preferably 10 mol% or less.

  The main components of the polyester (B) of the present invention are the dicarboxylic acid component (B1) and the diol component (B2), and aliphatic dicarboxylic acid (B1-1), alicyclic dicarboxylic acid (B1-2), and aroma Aliphatic dicarboxylic acid (B1-3), at least one dicarboxylic acid component (B1), aliphatic diol (B2-1), alicyclic diol (B2-2), aromatic diol (B2-3) It is preferable that it is at least one diol component (B2) selected from Alternatively, the main component of the polyester (B) of the present invention is preferably any one selected from aliphatic oxycarboxylic acids, alicyclic oxycarboxylic acids and aromatic oxycarboxylic acids. Among them, aromatic dicarboxylic acid (B1-3), aromatic diol (B2-3) and aromatic oxycarboxylic acid are styrene block (C1) of styrene-ethylene-butylene-styrene copolymer (C), and And / or the interaction of styrene-butadiene-butylene-styrene copolymer (C ') with the aromatic ring of styrene block (C'1) improves the interfacial adhesion between polyolefin (A) and polyester (B), The mechanical properties and abrasion resistance of the composite fiber obtained are improved, and high-quality fibers and a fiber structure in which the occurrence of peeling and fluff is suppressed can be obtained, which is preferable.

  Specific examples of the aliphatic dicarboxylic acid (B1-1) in the present invention include malonic acid, fumaric acid, maleic acid, succinic acid, itaconic acid, adipic acid, azelaic acid, sebacic acid, 1,1-undecanedicarboxylic acid, 1 1,2-cyclohexanedicarboxylic acid as a specific example of alicyclic dicarboxylic acid (B1-2) such as 1,12-dodecanedicarboxylic acid, 1,14-tetradecanedicarboxylic acid, 1,18-octadecanedicarboxylic acid, dimer acid, etc. Specific examples of aromatic dicarboxylic acid (B1-3) such as 1,3-cyclohexanedicarboxylic acid, 1,4-cyclohexanedicarboxylic acid, decalin-2, 6-dicarboxylic acid and the like, terephthalic acid, phthalic acid, isophthalic acid, 5 Sodium sulfoisophthalic acid, 1,5-naphthalene dicarboxylic acid, 2,6-naphthalene di- Carboxylic acid, 2,2'-biphenyl dicarboxylic acid, 3,3'-biphenyl dicarboxylic acid, 4,4'-biphenyl dicarboxylic acid, anthracene dicarboxylic acid include, but are not limited to. In addition, specific examples of the aliphatic diol (B2-1) include ethylene glycol, trimethylene glycol, tetramethylene glycol, hexamethylene glycol, diethylene glycol, polyethylene glycol, polypropylene glycol, neopentyl glycol and the like, alicyclic diol (B2- As a specific example of 2), as a specific example of aromatic diol (B2-3), such as a 1, 2- cyclohexane dimethanol, a 1, 3- cyclohexane dimethanol, a 1, 4- cyclohexane dimethanol, spiro glycol, isosorbide, etc., Examples include, but are not limited to, catechol, naphthalene diol, bisphenol and the like. Furthermore, specific examples of aliphatic oxycarboxylic acid include lactic acid, glycolic acid, α-oxyisobutyric acid, β-oxyisobutyric acid, oxypivalic acid, etc. Specific examples of aromatic oxycarboxylic acid include salicylic acid, m-oxybenzoic acid, p -Hydroxybenzoic acid, mandelic acid, atrolactic acid and the like, but it is not limited thereto.

  Specific examples of the polyester (B) of the present invention include polyethylene terephthalate, polypropylene terephthalate, polybutylene terephthalate, polyhexamethylene terephthalate, polyethylene naphthalate, polyethylene adipate, polypropylene adipate, polybutylene adipate, polyethylene succinate, polypropylene succinate, poly Examples include, but are not limited to, butylene succinate, polyethylene sebacate, polypropylene sebacate, polybutylene sebacate, polycaprolactone, polylactic acid, polyglycolic acid and the like.

  The polyester (B) of the present invention may be copolymerized with other copolymerization components, and specific examples thereof include aliphatic dicarboxylic acids (B1-1) and alicyclic dicarboxylic acids (B1-2) described above. ), Aromatic dicarboxylic acid (B1-3), aliphatic diol (B2-1), alicyclic diol (B2-2), aromatic diol (B2-3), aliphatic oxycarboxylic acid, alicyclic oxy Although carboxylic acid, aromatic oxycarboxylic acid etc. are mentioned, it is not limited to these. Among them, aromatic dicarboxylic acid (B1-3), aromatic diol (B2-3) and aromatic oxycarboxylic acid are styrene block (C1) of styrene-ethylene-butylene-styrene copolymer (C), styrene -Interfacial adhesivity of polyolefin (A) and polyester (B) improves by interaction with the aromatic ring of styrene block (C'1) of butadiene-butylene-styrene copolymer (C '), and the compound obtained is obtained The mechanical properties and abrasion resistance of the fiber are improved, and a high quality fiber and a fiber structure in which the occurrence of peeling and fluff is suppressed can be obtained, which is preferable. One of these copolymerization components may be used alone, or two or more thereof may be used in combination.

  The conjugate fiber of the present invention contains a styrene-ethylene-butylene-styrene copolymer (C) and / or a styrene-butadiene-butylene-styrene copolymer (C '). Styrene-ethylene-butylene-styrene copolymer (C) and styrene-butadiene-butylene-styrene copolymer (C ') are compatible because they have high affinity with both polyolefin (A) and polyester (B) Act as an agent. Therefore, the compatibility of polyolefin (A) and polyester (B) improves, and the interfacial adhesiveness of polyolefin (A) and polyester (B) improves. Due to the effect of improving interface adhesion, mechanical properties and abrasion resistance of the resulting composite fiber can be improved, and high-quality fibers and fiber structures can be obtained in which the occurrence of peeling and fluff is suppressed. In the composite fiber of the present invention, the styrene-ethylene-butylene-styrene copolymer (C) and / or the styrene-butadiene-butylene-styrene copolymer (C ') are polyolefin (A) and polyester (B) And the region consisting only of the polyolefin (A) and / or the region consisting only of the polyester (B), but by existing at the interface of the polyolefin (A) and the polyester (B), Can exert its effect.

  The styrene-ethylene-butylene-styrene copolymer (C) and / or styrene-butadiene-butylene-styrene copolymer (C ') of the present invention is a styrene block (C1 and / or C1') in an amount of 15.0 to 0. It is preferable to contain 45.0 parts by weight. When the content of styrene block (C1 and / or C1 ') is 15.0 parts by weight or more, styrene-ethylene-butylene-styrene copolymer (C) and / or styrene-butadiene-butylene-styrene copolymer Styrene-ethylene-butylene- present at the interface between the polyolefin (A) and the polyester (B) when external force such as tension is applied to the fiber because the mechanical properties such as strength and elongation of the united (C ') are high. Styrene copolymer (C) and / or styrene-butadiene-butylene-styrene copolymer (C ') are preferable because they contribute to mechanical properties such as strength and elongation, and the mechanical properties of the resulting composite fiber are improved. . The content of the styrene block (C1 and / or C1 ') is more preferably 20.0 parts by weight or more, and still more preferably 25.0 parts by weight or more. On the other hand, if the content of styrene block (C1 and / or C1 ') is 45.0 parts by weight or less, styrene-ethylene-butylene-styrene copolymer (C) and / or styrene-butadiene-butylene-styrene copolymer Styrene-ethylene-butylene-styrene copolymer when an external force such as abrasion is applied to the fiber and the strain at the interface of the polyolefin (A) and the polyester (B) occurs because the polymer (C ′) is flexible The deformation of (C) and / or styrene-butadiene-butylene-styrene copolymer (C ') follows strain, which is less likely to cause interfacial peeling, and is preferable because the abrasion resistance of the resulting composite fiber is improved. The content of the styrene block (C1 and / or C1 ') is more preferably 40.0 parts by weight or less, still more preferably 35.0 parts by weight or less.

  In the styrene-ethylene-butylene-styrene copolymer (C) of the present invention, the weight ratio (C2 / C3) of ethylene block (C2) to butylene block (C3) is 0.1 to 1.0 preferable. When the weight ratio (C2 / C3) is 0.1 or more, since the styrene-ethylene-butylene-styrene copolymer (C) is flexible, external force such as abrasion is applied to the fiber, and the polyolefin (A) and When distortion occurs in the interface of the polyester (B), the deformation of the styrene-ethylene-butylene-styrene copolymer (C) follows the distortion, and interfacial peeling hardly occurs, and the abrasion resistance of the obtained composite fiber is Since it becomes favorable, it is preferable. The weight ratio (C2 / C3) is more preferably 0.15 or more, and still more preferably 0.25 or more. On the other hand, when the weight ratio (C2 / C3) is 1.0 or less, the affinity with the polyolefin (A) is high, the compatibility between the polyolefin (A) and the polyester (B) is good, and the interfacial adhesion is improved. As the mechanical properties and abrasion resistance of the composite fiber to be obtained are improved, and high-quality fibers and a fiber structure in which the occurrence of peeling and fluff is suppressed can be obtained. The weight ratio (C2 / C3) is more preferably 0.7 or less, still more preferably 0.5 or less.

  In the styrene-butadiene-butylene-styrene copolymer (C ') of the present invention, the weight ratio (C'2 / C'3) of butadiene block (C'2) and butylene block (C'3) is 0. It is preferable that it is 1-1.0. When the weight ratio (C'2 / C'3) is 0.1 or more, since the styrene-butadiene-butylene-styrene copolymer (C ') is flexible, an external force such as abrasion is applied to the fiber, When distortion occurs at the interface between the polyolefin (A) and the polyester (B), the deformation of the styrene-butadiene-butylene-styrene copolymer (C ') follows the distortion and the interfacial peeling hardly occurs, resulting in a composite It is preferable because the abrasion resistance of the fiber is improved. The weight ratio (C ′ 2 / C ′ 3) is more preferably 0.15 or more, and still more preferably 0.25 or more. On the other hand, when the weight ratio (C'2 / C'3) is 1.0 or less, the affinity with the polyolefin (A) is high, the compatibility between the polyolefin (A) and the polyester (B) is good, and the interface Adhesion is improved, mechanical properties and abrasion resistance of the obtained composite fiber are improved, and high-quality fibers and a fiber structure in which peeling and generation of fluff are suppressed can be obtained, which is preferable. The weight ratio (C ′ 2 / C ′ 3) is more preferably 0.7 or less, and still more preferably 0.5 or less.

  The styrene-ethylene-butylene-styrene copolymer (C) and / or styrene-butadiene-butylene-styrene copolymer (C ') of the present invention is an acid anhydride group, a carboxyl group, a hydroxyl group, an epoxy group, amino It is preferred to have at least one functional group selected from a group and an imino group. These functional groups have high affinity with the polyester (B) and can react with the polyester (B), so the interfacial adhesion between the polyolefin (A) and the polyester (B) becomes stronger, and the mechanical properties and abrasion resistance The properties are further improved, and high-quality fibers and fibrous structures in which the occurrence of peeling and fluff is suppressed can be obtained, which is preferable. Among them, an amino group and an imino group are preferable because they have high reactivity with the polyester (B), and an amino group is particularly preferable.

  The composite fiber of the present invention comprises a total of 100 of polyolefin (A), polyester (B), styrene-ethylene-butylene-styrene copolymer (C) and / or styrene-butadiene-butylene-styrene copolymer (C '). In parts by weight, the contents of the polyolefin (A) and the polyester (B) can be appropriately selected.

  The composite fiber of the present invention comprises a total of 100 of polyolefin (A), polyester (B), styrene-ethylene-butylene-styrene copolymer (C) and / or styrene-butadiene-butylene-styrene copolymer (C '). It is preferable to contain 0.1 to 30.0 parts by weight of a styrene-ethylene-butylene-styrene copolymer (C) and / or a styrene-butadiene-butylene-styrene copolymer (C ') based on a part by weight . If the content of styrene-ethylene-butylene-styrene copolymer (C) and / or styrene-butadiene-butylene-styrene copolymer (C ') is 0.1 parts by weight or more, polyolefin (A) and polyester Since the compatibilizing effect with (B) is obtained, interface adhesion is improved, and the mechanical properties and abrasion resistance of the obtained composite fiber are improved, and high-quality fibers in which the occurrence of peeling and fluff is suppressed And preferred because a fiber structure can be obtained. The content of the styrene-ethylene-butylene-styrene copolymer (C) and / or the styrene-butadiene-butylene-styrene copolymer (C ') is more preferably 0.3 parts by weight or more, 0. More preferably, it is 5 parts by weight or more. On the other hand, if the content of the styrene-ethylene-butylene-styrene copolymer (C) and / or the styrene-butadiene-butylene-styrene copolymer (C ') is 30.0 parts by weight or less, the composite fiber is constituted. It is preferable because it can maintain the fiber characteristics, the appearance and the texture derived from the polyolefin (A) and the polyester (B). Moreover, since it can suppress the destabilization of the spinning operation by excess styrene- ethylene- butylene- styrene copolymer (C) and / or a styrene- butadiene- butylene- styrene copolymer (C '), it is preferable. The content of the styrene-ethylene-butylene-styrene copolymer (C) and / or the styrene-butadiene-butylene-styrene copolymer (C ') is more preferably 20.0 parts by weight or less, and 10. More preferably, it is 0 parts by weight or less, and particularly preferably 5.0 parts by weight or less.

  The composite fiber of the present invention may be one which has been subjected to various modifications with the addition of secondary additives. Specific examples of secondary additives include plasticizers, antioxidants, UV absorbers, infrared absorbers, fluorescent brighteners, mold release agents, antibacterial agents, nucleating agents, heat stabilizers, antistatic agents, coloring These include, but are not limited to, inhibitors, modifiers, matting agents, antifoaming agents, preservatives, gelling agents, latexes, fillers, inks, colorants, dyes, pigments, perfumes and the like. One of these secondary additives may be used alone, or two or more thereof may be used in combination.

  In the composite fiber of the present invention, both the polyolefin (A) and the polyester (B) may be present in the surface layer of the fiber, and only one of the polyolefin (A) and the polyester (B) is present in the surface layer of the fiber It is also good. The polyolefin (A) is more excellent in abrasion resistance than the polyester (B), so from the viewpoint of abrasion resistance, it is preferable that only the polyolefin (A) is present in the surface layer of the fiber. Moreover, since polyester (B) is excellent in dyeability than polyolefin (A), it is preferable that only polyester (B) exists in the fiber surface layer from a dyeable viewpoint. On the other hand, as described above, the present invention succeeds in dramatically improving the compatibility between the polyolefin (A) and the polyester (B), which was the conventional problem, and the interfacial adhesion between the polyolefin (A) and the polyester (B) Naturally, both the polyolefin (A) and the polyester (B) are formed on the surface layer of the fiber, because the mechanical properties and the abrasion resistance are improved and the occurrence of peeling and fluff is suppressed. It may exist.

  The composite fiber of the present invention is not particularly limited as to the cross-sectional composite form, and can be appropriately selected according to the application and the required characteristics. 1 (a) to 1 (n) are examples of cross-sectional composite forms of the composite fiber of the present invention, and core-sheath types as shown in FIGS. 1 (a) and 1 (b); Such as eccentric core-sheath type, multi-core-sheath type as shown in FIG. 1 (e), (f), sea-island type as shown in FIG. 1 (g), (h), as shown in FIG. 1 (i), (j) Examples of the side-by-side type and the multilayer bonding type as shown in FIGS. 1 (k) to 1 (n) are not limited thereto.

  The composite fiber of the present invention is not particularly limited as to the cross-sectional shape of the fiber, and can be appropriately selected according to the application and the required characteristics, and may be a circular cross section or a non-circular cross section. Good. Specific examples of non-circular cross-sections are multi-leaf, polygon, flat, oval, C-shape, H-shape, S-shape, T-shape, W-shape, X-shape, Y-shape, Ta-shape, parallel cross, hollow shape And the like, but not limited thereto.

  The fineness of the composite fiber of the present invention as a multifilament is not particularly limited and can be appropriately selected according to the application and the required properties, but is preferably 10 to 3000 dtex. The fineness in the present invention refers to the value measured by the method described in the examples. If the fineness of the composite fiber is 10 dtex or more, it is preferable because there are few yarn breaks and good process passability, little generation of fluff during use, and excellent durability. The fineness of the composite fiber is more preferably 30 dtex or more, and still more preferably 50 dtex or more. On the other hand, if the fineness of the composite fiber is 3,000 dtex or less, this is preferable because the flexibility of the fiber and the fiber structure is not impaired. The fineness of the composite fiber is more preferably 2500 dtex or less, and still more preferably 2000 dtex or less.

  The single yarn fineness of the conjugate fiber of the present invention is not particularly limited and can be appropriately selected depending on the application and required properties, but is preferably 0.5 to 20 dtex. The single yarn fineness in the present invention refers to a value obtained by dividing the fineness measured by the method described in the examples by the number of single yarns. If the single fiber fineness of the composite fiber is 0.5 dtex or more, it is preferable because there is little yarn breakage and good processability, little fluff is generated at the time of use, and the durability is excellent. The single yarn fineness of the conjugate fiber is more preferably 0.6 dtex or more, and still more preferably 0.8 dtex or more. On the other hand, if the single yarn fineness of the composite fiber is 20 dtex or less, this is preferable because the flexibility of the fiber and the fiber structure is not impaired. The single yarn fineness of the conjugate fiber is more preferably 15 dtex or less, and still more preferably 12 dtex or less.

  The strength of the composite fiber of the present invention is not particularly limited and can be appropriately selected depending on the application and required properties, but is preferably 1.0 to 6.0 cN / dtex from the viewpoint of mechanical properties. The strength in the present invention refers to a value measured by the method described in the examples. If the strength of the composite fiber is 1.0 cN / dtex or more, it is preferable because the generation of fluff during use is small and the durability is excellent. The strength of the composite fiber is more preferably 1.5 cN / dtex or more, still more preferably 2.0 cN / dtex or more. On the other hand, if the strength of the composite fiber is 6.0 cN / dtex or less, this is preferable because the flexibility of the fiber and the fiber structure is not impaired.

  The elongation of the composite fiber of the present invention is not particularly limited and can be appropriately selected according to the application and required properties, but is preferably 10 to 60% from the viewpoint of durability. Elongation in the present invention refers to a value measured by the method described in the examples. If the elongation of the composite fiber is 10% or more, the wear resistance of the fiber and the fiber structure becomes good, the generation of fluff is reduced during use, and the durability becomes good, which is preferable. The elongation of the composite fiber is more preferably 15% or more, further preferably 20% or more. On the other hand, if the elongation of the composite fiber is 60% or less, the dimensional stability of the fiber and the fiber structure becomes good, which is preferable. The elongation of the composite fiber is more preferably 55% or less, still more preferably 50% or less.

  The fineness fluctuation value U% (hi) of the composite fiber of the present invention is preferably 0.1 to 1.5%. The fineness fluctuation value U% (hi) in the present invention refers to a value measured by the method described in the examples. The fineness fluctuation value U% (hi) is an index of thickness unevenness in the longitudinal direction of the multifilament fiber, and the smaller the fineness fluctuation value U% (hi), the smaller the thickness unevenness in the longitudinal direction of the fiber. The smaller the fineness fluctuation value U% (hi), the smaller the better in terms of processability and grade, but the lower limit is 0.1% as a manufacturable range. On the other hand, when the fineness fluctuation value U% (hi) of the composite fiber is 1.5% or less, the uniformity in the longitudinal direction of the fiber is excellent, and fluff and breakage of yarn do not easily occur. It is preferable because defects such as spots and dyeing streaks hardly occur and high-quality fibers and fiber structures can be obtained. The fineness fluctuation value U% (hi) of the conjugate fiber is more preferably 1.2% or less, still more preferably 1.0% or less, and particularly preferably 0.8% or less.

  The composite fiber of the present invention is not particularly limited as to the form of the fiber, and may be any form such as monofilament, multifilament, staple and the like.

  The composite fiber of the present invention can be processed into false twisting or twisted yarn in the same manner as general fibers, and can be treated in the same manner as general fibers in weaving and knitting.

  The form of the fiber structure made of the composite fiber of the present invention is not particularly limited, and may be woven fabric, knitted fabric, pile fabric, non-woven fabric, spun yarn, wadding or the like according to a known method. The fiber structure made of the composite fiber of the present invention may be any woven or knitted structure, and may be plain weave, twill weave, satin weave, or change fabric of these, warp knit, weft knit, circular knit, lace knit Or these change knitting etc. can be adopted suitably.

  The composite fiber of the present invention may be combined with other fibers by cross-weaving, cross-knitting or the like when it is made into a fiber structure, or may be made into a fiber structure after being made into mixed yarn with other fibers.

  Next, the method for producing the composite fiber of the present invention is shown below.

  As a method for producing the composite fiber of the present invention, known melt spinning methods, stretching methods and false twisting methods can be adopted.

  In the present invention, before melt spinning, the polyolefin (A), the polyester (B), the styrene-ethylene-butylene-styrene copolymer (C) and / or the styrene-butadiene-butylene-styrene copolymer (C ') Is preferably dried to keep the water content to 0.3% by weight or less. If the water content is 0.3% by weight or less, it is preferable because it is possible to stably carry out spinning without foaming due to moisture in melt spinning. In addition, it is preferable because hydrolysis during spinning can be suppressed, and deterioration in mechanical properties and color tone of the resulting composite fiber can be suppressed. The water content is more preferably 0.2% by weight or less and still more preferably 0.1% by weight or less.

  In the present invention, if necessary, polyolefin (A) and styrene-ethylene-butylene-styrene copolymer (C) and / or styrene-butadiene-butylene-styrene copolymer (C '), or polyester (B) Using a chip which has been melt-kneaded in advance with an extruder or the like, and a styrene-ethylene-butylene-styrene copolymer (C) and / or a styrene-butadiene-butylene-styrene copolymer (C ') Melt spinning may be performed.

  When melt spinning is performed, chips dried beforehand in advance are supplied to a melt spinning machine such as an extruder type or a pressure melter type, melted, and metered by a metering pump. Thereafter, the molten polymer is introduced into a heated spinning pack in a spinning block, and the molten polymer is filtered in the spinning pack, and then discharged from a spinneret to form a fiber yarn.

  The fiber yarn discharged from the spinneret is cooled and solidified by a cooling device, taken up by a first godet roller, taken up by a winder through a second godet roller, and taken as a winding yarn. In addition, in order to improve the spinning performance, the productivity, and the mechanical characteristics of the fiber, a heating cylinder or a heat insulating cylinder having a length of 2 to 50 cm may be installed at the lower part of the spinneret as needed. Further, the fiber yarn may be refueled using a refueling device, and the interlacing device may be used to impart entanglement to the fiber yarn.

  The spinning temperature in melt spinning is the melting point of polyolefin (A), polyester (B), styrene-ethylene-butylene-styrene copolymer (C) and / or styrene-butadiene-butylene-styrene copolymer (C ') Although it can select suitably according to heat resistance etc., it is preferable that it is 220-320 degreeC. When the spinning temperature is 220 ° C. or higher, the elongation viscosity of the fiber yarn discharged from the spinneret is sufficiently reduced, so that the discharge is stabilized, and furthermore, the spinning tension does not become excessively high, and the yarn breakage is suppressed. It is preferable because it can be The spinning temperature is more preferably 230 ° C. or more, still more preferably 240 ° C. or more. On the other hand, if the spinning temperature is 320 ° C. or less, it is possible to suppress the thermal decomposition at the time of spinning, and to suppress the decrease in the mechanical properties of the obtained composite fiber and the coloring, which is preferable. The spinning temperature is more preferably 300 ° C. or less, still more preferably 280 ° C. or less.

  The spinning speed in melt spinning can be appropriately selected according to the composite ratio of the polyolefin (A) and the polyester (B), the spinning temperature, etc., but is preferably 500 to 6000 m / min. If the spinning speed is 500 m / min or more, the running yarn is stable, and yarn breakage can be suppressed, which is preferable. The spinning speed in the two-step method is more preferably 1000 m / min or more, and still more preferably 1500 m / min or more. On the other hand, if the spinning speed is 6000 m / min or less, it is preferable because stable spinning can be performed without breakage of yarn by suppression of spinning tension. The spinning speed in the two-step method is more preferably 4500 m / min or less, still more preferably 4000 m / min or less. Moreover, as for the spinning speed in the case of a one-step method in which spinning and drawing are simultaneously performed without winding up, it is preferable to set the low speed roller to 500 to 5000 m / min and the high speed roller to 2500 to 6000 m / min. If the low speed roller and the high speed roller are within the above range, the running yarn can be stabilized, yarn breakage can be suppressed, and stable spinning can be performed, which is preferable. The spinning speed in the case of the one-step method is more preferably 1000 to 4500 m / min for the low speed roller and 3500 to 5500 m / min for the high speed roller, 1500 to 4000 m / min for the low speed roller and 4000 to 5000 m / min for the high speed roller. It is further preferable to

  When drawing is performed by a one-step method or a two-step method, any method of a one-step drawing method or a two or more multi-step drawing method may be used. It will not specifically limit, if it is an apparatus which can heat a traveling yarn directly or indirectly as a heating method in extending | stretching. Specific examples of the heating method include, but are not limited to, a heating roller, a heating pin, a heating plate, a liquid bath such as hot water or hot water, a hot air, a gas bath such as steam, or a laser. These heating methods may be used alone or in combination of two or more. As a heating method, from the viewpoint of control of heating temperature, uniform heating to traveling yarn, and complexity of the device, contact with heating roller, contact with heat pin, contact with heat plate, immersion in liquid bath It can be adopted suitably.

  When the stretching is performed, the stretching temperature is as follows: polyolefin (A), polyester (B), styrene-ethylene-butylene-styrene copolymer (C) and / or styrene-butadiene-butylene-styrene copolymer (C ') Although it can select suitably according to melting | fusing point, the intensity | strength of the fiber after extending | stretching, etc., it is preferable that it is 20-150 degreeC. When the drawing temperature is 20 ° C. or more, the yarn supplied for drawing is sufficiently preheated, the thermal deformation at the time of drawing becomes uniform, and the generation of fuzz and fineness spots can be suppressed, and the fiber longitudinal direction It is preferable because it is possible to obtain high-quality fibers and a fiber structure which are excellent in uniformity of the above, and excellent in leveling properties. The stretching temperature is more preferably 50 ° C. or more, still more preferably 70 ° C. or more. On the other hand, if the stretching temperature is 150 ° C. or less, fusion and thermal decomposition of the fibers caused by the contact with the heating roller can be suppressed, and the process passability and the quality are favorable, which is preferable. Moreover, since the slipperiness of the fiber with respect to the stretching roller is improved, yarn breakage is suppressed, and stable stretching can be performed, which is preferable. The stretching temperature is more preferably 145 ° C. or less, still more preferably 140 ° C. or less. Moreover, you may heat-set at 60-150 degreeC as needed.

  Although the draw ratio in the case of extending | stretching can be suitably selected according to the elongation of the fiber before extending | stretching, the intensity | strength of the fiber after extending | stretching, an elongation, etc., it is 1.02 to 7.0 times Is preferred. If the draw ratio is 1.02 times or more, mechanical properties such as strength and elongation of the fiber can be improved by drawing, which is preferable. The stretching ratio is more preferably 1.2 times or more, further preferably 1.5 times or more. On the other hand, if a draw ratio is 7.0 times or less, since thread breakage at the time of drawing is controlled and stable drawing can be performed, it is preferable. The stretching ratio is more preferably 6.0 times or less, still more preferably 5.0 times or less.

  The stretching speed in the case of stretching can be appropriately selected depending on whether the stretching method is a one-step method or a two-step method. In the case of the one-step process, the speed of the high-speed roller at the above spinning speed corresponds to the drawing speed. It is preferable that the extending | stretching speed in the case of extending | stretching by a two-step method is 30-1000 m / min. If the stretching speed is 30 m / min or more, the running yarn is stable and yarn breakage can be suppressed, which is preferable. The drawing speed in the case of drawing by the two-step method is more preferably 50 m / min or more, and still more preferably 100 m / min or more. On the other hand, if the stretching speed is 1000 m / min or less, yarn breakage during stretching can be suppressed and stable stretching can be performed, which is preferable. The drawing speed in the case of drawing by the two-step method is more preferably 900 m / min or less, and still more preferably 800 m / min or less.

  When false twisting is performed, so-called blistering using both the one-stage heater and the two-stage heater can be appropriately selected in addition to the so-called wooly process using only the one-stage heater.

  As an apparatus used for false twist processing, here, FR (feed roller), 1DR (1 draw roller) heater, cooling plate, false twist device, 2DR (2 draw roller), 3DR (3 draw roller), entangled nozzle, 4DR ( 4 illustrates a false twist processing apparatus equipped with a draw roller) and a winder.

  The processing magnification of FR-1DR can be appropriately selected according to the elongation of fibers used for false twisting and the elongation of fibers after false twisting, but is preferably 1.0 to 2.0 times .

  The heating method of the heater may be either contact or non-contact. The heater temperature is the melting point of the polyolefin (A), polyester (B), styrene-ethylene-butylene-styrene copolymer (C) and / or styrene-butadiene-butylene-styrene copolymer (C '), false twist, It can be appropriately selected according to the strength, elongation, etc. of the fiber after processing, but it is preferable that the heater temperature in the case of the contact type is 90 ° C. or higher, and the heater temperature in the non-contact type is 150 ° C. or higher . If the heater temperature in the contact type is 90 ° C. or higher, or the heater temperature in the non-contact type is 150 ° C. or higher, the yarn supplied for false twisting is sufficiently preheated, and the heat accompanying the stretching The deformation is uniform, and generation of fluff and fineness unevenness can be suppressed, and high-quality fibers and a fiber structure having excellent uniformity in the fiber longitudinal direction and excellent in leveling properties can be obtained, which is preferable. The heater temperature in the case of the contact type is more preferably 100 ° C. or more, and still more preferably 110 ° C. or more. The heater temperature in the case of non-contact type is more preferably 200 ° C. or more, and still more preferably 250 ° C. or more. The upper limit of the heater temperature may be a temperature at which the undrawn yarn or drawn yarn used for false twisting does not fuse in the heater.

  The false twist device is preferably a friction false twist type, and examples thereof include a friction disc type, a belt nip type, and the like, but are not limited thereto. Among them, a friction disk type is preferable, and by forming all of the material of the disk with a ceramic, it is preferable because the false twisting can be stably performed even when the disk is operated for a long time. The magnification between 2DR and 3DR and between 3DR and 4DR can be appropriately selected according to the strength and elongation of the fiber after false twisting, but is preferably 0.9 to 1.0. Between 3DR-4DR, in order to improve the process passability of the fiber after false twist processing, entanglement addition by an entanglement nozzle or oil addition by an oil supply guide may be performed.

  Although the processing speed in the case of performing false twist processing can be selected suitably, it is preferable that it is 200-1000 m / min. If the processing speed is 200 m / min or more, it is preferable because the traveling yarn is stabilized and yarn breakage can be suppressed. The processing speed is more preferably 300 m / min or more, and still more preferably 400 m / min or more. On the other hand, if the processing speed is 1000 m / min or less, yarn breakage at the time of false twisting is suppressed, and stable false twist processing can be performed, which is preferable. The processing speed is more preferably 900 m / min or less, still more preferably 800 m / min or less.

  In the present invention, if necessary, it may be dyed in any state of fiber or fiber structure. In the present invention, a disperse dye or a cationic dye can be suitably employed as the dye. Although the polyolefin (A) constituting the composite fiber of the present invention is hardly dyed with a dye, the polyester (B) can be dyed, so that the composite fiber of the present invention and the fiber structure consisting thereof Is possible.

  The dyeing method in the present invention is not particularly limited, and a cheese dyer, a flow dyer, a drum dyer, a beam dyer, a jigger, a high pressure jigger or the like can be suitably adopted according to a known method.

  In the present invention, the dye concentration and the dyeing temperature are not particularly limited, and known methods can be suitably employed. In addition, if necessary, scouring may be performed before dyeing processing, or reduction washing may be performed after dyeing processing.

  The composite fiber of the present invention and the fiber structure made of the same have both the properties of polyolefin and polyester, and are excellent in mechanical properties and abrasion resistance, and at the same time, the occurrence of peeling and fluff is suppressed. Therefore, in applications where conventional polyolefin fibers or polyester fibers are used, they can be suitably used particularly in applications requiring high quality. For example, general clothing applications such as women's clothing, men's clothing, lining, underwear, down, vest, inner, outer, etc., windbreakers, outdoor wear, ski wear, golf wear, sports clothing applications such as swimwear, futon side, futon Covers, bedding for blankets, blankets, side areas for blankets, blanket covers, pillow covers, pillow fillers, bedding applications such as sheets, tablecloths, curtains, tile carpets, household rugs, automotive mats, etc. interior applications Material applications such as belts, bags, sewing threads, sleeping bags, tents, ropes, curing nets, filter cloths, narrow tapes, braids, and upholstery, etc. may be mentioned, but are not limited thereto.

  Hereinafter, the present invention will be described in more detail by way of examples. In addition, each characteristic value in an Example is calculated | required by the following method.

A. Composite ratio Polyolefin (A), polyester (B), styrene-ethylene-butylene-styrene copolymer (C) and / or styrene-butadiene-butylene-styrene copolymer (C ') used as raw materials of composite fiber The total was 100 parts by weight, and A / B / C or C 'and C + C' (parts by weight) were calculated as composite ratios.

B. Under an environment of a fineness temperature of 20 ° C. and a humidity of 65% RH, 100 m of the fibers obtained in the example were squeezed off using an electric measuring machine made by INTEC. The weight of the obtained skein was measured, and the fineness (dtex) was calculated using the following equation. The measurement was performed five times for one sample, and the average value was defined as the fineness.
Fineness (dtex) = weight of fiber 100 m (g) × 100.

C. Strength, Elongation The strength and the elongation were calculated according to JIS L1013: 2010 (chemical fiber filament yarn test method) 8.5.1 using the fibers obtained in the examples as samples. Under an environment of temperature 20 ° C. and humidity 65% RH, a tensile test was conducted under the conditions of an initial sample length of 20 cm and a tensile speed of 20 cm / min using Tensilon UTM-III-100 manufactured by ORIENTEC Co., Ltd. The stress (cN) at the point showing the maximum load is divided by the fineness (dtex) to calculate the strength (cN / dtex), and the elongation (L1) at the point showing the maximum load and the initial sample length (L0) are used below The elongation (%) was calculated by the equation. In addition, the measurement was performed 10 times per sample, and the average value was made into intensity | strength and elongation.
Elongation (%) = {(L1−L0) / L0} × 100.

D. Fineness fluctuation value U% (hi)
Using the fiber obtained according to the example as a sample, the fineness fluctuation value U% (hi) is measured at a measurement speed of 200 m / min, a measurement time of 2.5 minutes, and a measured fiber length using a Wooster tester 4-CX manufactured by Zellberger Wooster. U% (half inert) was measured under the conditions of 500 m and twist number 12000 / m (S twist). The measurement was performed five times for one sample, and the average value was defined as the fineness fluctuation value U% (hi).

E. Interfacial Adhesion The fibers obtained according to the examples are deposited with a platinum-palladium alloy, and then a cross section perpendicular to the fiber axis, that is, the fiber cross section, using Hitachi scanning electron microscope (SEM) type S-4000. Were observed, and ten photomicrographs of the fiber cross section were taken. The observation is performed at 100 times, 300 times, 500 times, 1000 times, 3000 times, 5000 times and 10000 times magnification, and when taking a photomicrograph, the highest magnification at which all single yarns in the sample can be observed Selected. If interfacial peeling has occurred even in one place in one of the photos taken, it is judged as "peeling", and according to the number of photographs of "peeling", 段 階, 、, 、, × in four stages evaluated. In the evaluation, ◎ is the best, it worsens in the order of ○ and 、, and x is the worst.
:: 0 sheets of "with peeling" ○: 1 to 2 sheets of "with peeling" Δ: 3 to 7 sheets of "with peeling" X: 8 to 10 of "with peeling" .

F. The number of fluffs The number of fluffs uses the fiber obtained by the example as a sample and measures speed 500 m / min, measuring time 20 minutes, measuring fiber length 10000 m, detection height using Toray Engineering product fluff counting device DT-105. The number of fluffs (number per 10000 m) was measured under the condition of 0.5 mm. The measurement was performed five times for one sample, and the average value was defined as the number of fluffs.

G. Wear resistance The fiber obtained according to the example was used as a sample and after about 2 g of tubular knitting was produced using a circular knitting machine NCR-BL (3 inch diameter (8.9 cm), 27 gauge) manufactured by Eiko Sangyo Co., Ltd. After scouring at 80 ° C for 20 minutes in an aqueous solution containing 1.5 g / L sodium carbonate and 0.5 g / L surfactant Granup US-20 made by Meisei Chemical Co., Ltd., wash with running water for 30 minutes and dry at 60 ° C with hot air It was dried for 60 minutes on board. Set the tubed after scouring to dry for 1 minute at 135 ° C, add 1.3% by weight of Kayalon Polyester Blue UT-YA made by Nippon Kayaku as a disperse dye to the tube after setting the dry heat, and add pH After dyeing in a dyeing solution adjusted to 5.0 at a bath ratio of 1: 100 and 130 ° C. for 45 minutes, it was washed with running water for 30 minutes and dried in a hot air dryer at 60 ° C. for 60 minutes. The dyed tubular knit was dry set at 135 ° C. for 1 minute to carry out finish setting. When a cationic dyeable polyester is used as the polyester (B), 1.0% by weight as a cationic dye, Kayakyl Blue 2 RL-ED manufactured by Nippon Kayaku Co., Ltd., in a dyeing solution adjusted to pH 4.0 The dyeing was performed under the conditions of a bath ratio of 1: 100, a dyeing temperature of 120 ° C., and a dyeing time of 40 minutes.
The evaluation of the abrasion resistance was conducted according to JIS L 1076: 2012 (Pilling test method for textiles and knits) 7.3 appearance and retention type testing machine method. The abrasion test is carried out with a pressing load of 3.92 N and a friction frequency of 20 times using the tubular knit after the above-mentioned finish setting as a sample, and the degree of discoloration of the sample is determined using the gray scale for discoloration determined in JIS L0804: 2004. , Graded discolored. Furthermore, with regard to the sample after the abrasion test, the state of fiber fibrils in the abraded part is observed with a magnifying glass of 30 times, and by a panel of five inspectors who have experience of grade determination for 5 years or more, ◎, 、, △ It was evaluated in four stages of x. In the evaluation, ◎ is the best, it worsens in the order of ○ and 、, and x is the worst.

Fibril: Evaluated based on the following criteria.
:: no fibrils, no change from the state before abrasion :: few fibrils, but no change from the state before abrasion :: fibrils, damage due to abrasion is observed x: fibrils There are many, and damage due to wear is remarkable.

H. Level dyeing, color development, grade With regard to the cylindrical braid after finishing and setting made in the above G, by a panel of five inspectors who have experience of grade determination for 5 years or more, in four stages of ◎, 、, 、, × evaluated. In the evaluation, ◎ is the best, it worsens in the order of ○ and 、, and x is the worst.

Level dyeing: Evaluated according to the following criteria.
:: very uniformly dyed, no stains observed at all ○: almost evenly dyed, almost no stains observed △: little uniform stains, faintly dyed spots X: The dye is not uniformly stained, and stain spots are clearly observed.

Chromogenicity: It evaluated by the following criteria.
:: not whiteish, vivid and deep ○: slightly whiteish, but vivid and deep Δ: quite whiteish, vivid and poor in both depths x: whiteish, neither vivid nor deep.

Grade: Evaluated according to the following criteria.
:: no fuzz, very excellent in grade :: almost no fuzz, excellent in grade Δ: fuzzy, poor grade x: many fuzz, extremely poor grade

Example 1
Using a biaxial extruder, polyethylene terephthalate (PET) (Toray T701T) and styrene-ethylene-butylene-styrene copolymer (C) (25 parts by weight of styrene block, ethylene block / butylene block = 0.25) The mixture was kneaded at a kneading temperature of 280 ° C., and the strand discharged from the twin screw extruder was water-cooled and then cut into a length of about 5 mm with a pelletizer to obtain pellets. A sheath comprising polypropylene (PP) (PP3155E5 manufactured by ExxonMobil) as a sheath component, and a pellet comprising PET and a styrene-ethylene-butylene-styrene copolymer (C) as a core component, and dried in vacuum at 150 ° C. for 12 hours The core component is fed to the extruder type composite spinning machine at a blending ratio of 70% by weight and the core component at 30% by weight and melted separately, core-sheath type composite spinneret at a spinning temperature of 285 ° C., discharge amount 31.5 g / min. The yarn was discharged from (discharge hole diameter: 0.18 mm, discharge hole length: 0.23 mm, hole number: 36, round hole) to obtain a spun yarn. The spun yarn is cooled with a wind temperature of 20 ° C. and a cooling air speed of 25 m / min, applied with an oil agent by a feeding device and converged, and taken up with a first godet roller rotating at 3000 m / min. It wound up with a winder through the 2nd godet roller rotated at the same speed as a debt roller, and obtained the 105 dtex-36f undrawn yarn. The obtained undrawn yarn was drawn under conditions of a first hot roller temperature of 90 ° C., a second hot roller temperature of 130 ° C., and a draw ratio of 2.1 times to obtain a drawn yarn of 50 dtex-36 f. The evaluation results of the fiber characteristics and the fabric characteristics of the obtained fiber are shown in Table 1.

Examples 2 to 6
A drawn yarn was produced in the same manner as in Example 1 except that the functional group of the styrene-ethylene-butylene-styrene copolymer (C) was changed as shown in Table 1. The evaluation results of the fiber characteristics and the fabric characteristics of the obtained fiber are shown in Table 1.

Examples 7 to 11
A drawn yarn was produced in the same manner as in Example 5 except that the content of the styrene block (C1) of the styrene-ethylene-butylene-styrene copolymer (C) was changed as shown in Table 2. The evaluation results of the fiber characteristics and the fabric characteristics of the obtained fiber are shown in Table 2.

Examples 12 to 16
Example 6 is the same as Example 5 except that the weight ratio (C2 / C3) of ethylene block (C2) to butylene block (C3) of the styrene-ethylene-butylene-styrene copolymer (C) is changed as shown in Table 2. A drawn yarn was produced. The evaluation results of the fiber characteristics and the fabric characteristics of the obtained fiber are shown in Table 2.

Comparative Example 1, Examples 17 to 21
A drawn yarn was produced in the same manner as in Example 5 except that the composite ratio of the polyolefin (A), the polyester (B) and the styrene-ethylene-butylene-styrene copolymer (C) was changed as shown in Table 3. The evaluation results of the fiber characteristics and the fabric characteristics of the obtained fiber are shown in Table 3.

  In Comparative Example 1, the styrene-ethylene-butylene-styrene copolymer (C) was not contained, the compatibility between polypropylene and polyethylene terephthalate was extremely low, and the interfacial adhesion was also very low, so the number of fuzz was large. In addition, the abrasion resistance was also extremely low, and a large number of fluffs were observed in the tubular knit after finishing and setting, and the leveling properties and the quality were both extremely poor.

Examples 22 to 28
As polyester (B), polypropylene terephthalate (PPT) (shell "Cortera" (registered trademark) CP 513000) in Example 22 and polybutylene terephthalate (PBT) (Example "Toraycon" (trade name) 1100S) manufactured by Toray in Example 23 In Example 24, polyethylene naphthalate (PEN) (Toyobo Co., Ltd. PN 640), in Example 25 polylactic acid (PLA) (Natureworks 6201 D), in Example 26 polybutylene succinate (PBS) (Showa Denko "Bionore""(Registered trademark) 1010", in Example 27, polycaprolactone (PCL) ("Placcel" (registered trademark) H1 P made by Daicel), in Example 28, polyglycolic acid (PGA) ("Kuredux" (registered trademark) made by Kureha Except using 100R60), To prepare a drawn yarn in the same manner as 施例 5. The evaluation results of the fiber properties and the fabric properties of the obtained fiber are shown in Table 4.

Examples 29 to 33
As polyester (B), polyethylene terephthalate obtained by copolymerizing 5.0% by weight of polyethylene glycol (PEG) (PEG 1000 manufactured by Sanyo Chemical Industries, number average molecular weight 1000 g / mol) as a diol component in Example 29; As polyethylene terephthalate copolymerized with 30 mol% of 1,4-cyclohexanedimethanol (CHDM), in Example 31 polyethylene terephthalate copolymerized with 10 mol% of isophthalic acid (IPA) as a dicarboxylic acid component, as Example 32 with a dicarboxylic acid component Polyethylene terephthalate copolymerized with 1.5 mol% of sodium 5-sulfoisophthalic acid (SSIA), and in Example 33, 1,4-dicarboxylic dicarboxylic acid (CHDC) 3 as a dicarboxylic acid component Except for using the mol% copolymerized polyethylene terephthalate was produced a drawn yarn in the same manner as in Example 5. The evaluation results of the fiber properties and the fabric properties of the obtained fiber are shown in Table 5.

Examples 34 to 37
Stretched yarn in the same manner as in Examples 5, 25, 30, 32 except that in Example 5, 25, 30, 32, the polyolefin (A) was changed from polypropylene to polymethylpentene (PMP) (DX 820 manufactured by Mitsui Chemicals) Was produced. The evaluation results of the fiber properties and the fabric properties of the obtained fiber are shown in Table 5.

Comparative examples 2 to 8
As a compatibilizer (C), in Comparative Example 2, a styrene-ethylene-propylene-styrene copolymer ("Septon" (registered trademark) 2004 made by Kuraray), in Comparative Example 3, a hydroxyl group-modified styrene-ethylene-ethylene-propylene-styrene Copolymer ("Septon" (registered trademark) HG-252 manufactured by Kuraray), styrene-butylene-styrene copolymer (Comparative product "Taphuprene" (registered trademark) A) in Comparative Example 4 and maleic anhydride in Comparative Example 5 Modified polyethylene ("Admar" (registered trademark) LF128) manufactured by Mitsui Chemicals, in the case of Comparative Example 6, maleic anhydride modified polypropylene (manufactured by Sanyo Chemical Industries, Ltd. "Eumex" (registered trademark) 1010), in Comparative Example 7, maleic anhydride modified ethylene- Butene copolymer ("Tafmer" (registered trademark) MH 7020 manufactured by Mitsui Chemicals, Inc .; ethylene in Comparative Example 8) Except for using glycidyl methacrylate copolymer (Sumitomo Chemical Co. "Bondfast" (registered trademark) E) was prepared drawn yarn in the same manner as in Example 5. The evaluation results of the fiber characteristics and the fabric characteristics of the obtained fiber are shown in Table 6.

  In any of the compatibilizers, the compatibility and interface adhesion between polypropylene and polyethylene terephthalate were insufficient, and mechanical properties, abrasion resistance, leveling properties and quality could not be provided.

Examples 38 to 41
In Example 5, the composite spinneret was changed to change the cross-sectional composite form as shown in Table 7, and the composite ratio of polyolefin (A), polyester (B) and styrene-ethylene-butylene-styrene copolymer (C) Was changed as shown in Table 7, and a drawn yarn was produced in the same manner as in Example 5. The evaluation results of the fiber characteristics and the fabric characteristics of the obtained fiber are shown in Table 7.

Comparative Examples 9 to 12
In Examples 38 to 41, Examples were obtained except that the styrene-ethylene-butylene-styrene copolymer (C) was not added and the composite ratio of the polyolefin (A) and the polyester (B) was changed as shown in Table 7. A drawn yarn was produced in the same manner as 38-41. The evaluation results of the fiber characteristics and the fabric characteristics of the obtained fiber are shown in Table 7.

  In any of Comparative Examples 9 to 12, the styrene-ethylene-butylene-styrene copolymer (C) is not contained, the compatibility between polypropylene and polyethylene terephthalate is extremely low, and the interfacial adhesion is also extremely low. There were many. In particular, in Comparative Examples 9, 11 and 12 in which both the polyolefin (A) and the polyester (B) were present in the surface layer of the fiber, the interfacial adhesion was poor and the generation of fuzz was extremely high. In addition, the abrasion resistance was also extremely low, and a large number of fluffs were observed in the tubular knit after finishing and setting, and the leveling properties and the quality were both extremely poor.

Examples 42 and 43
Examples 5 and 39, except that the composite ratio of polyolefin (A), polyester (B) and styrene-ethylene-butylene-styrene copolymer (C) is changed as shown in Table 7 in Examples 5 and 39 A drawn yarn was produced in the same manner. The evaluation results of the fiber characteristics and the fabric characteristics of the obtained fiber are shown in Table 7.

Example 44
Stretched yarn as in Example 1 except that styrene-butadiene-butylene-styrene copolymer (C ') (25 parts by weight of styrene block, ethylene block / butylene block = 0.25) was used as a compatibilizer Was produced. The evaluation results of the fiber characteristics and the fabric characteristics of the obtained fiber are shown in Table 8.

Examples 45 to 49
A drawn yarn was produced in the same manner as in Example 44 except that the functional group of the styrene-butadiene-butylene-styrene copolymer (C ') was changed as shown in Table 8. The evaluation results of the fiber characteristics and the fabric characteristics of the obtained fiber are shown in Table 8.

Examples 50 to 54
A drawn yarn was produced in the same manner as in Example 48 except that the content of the styrene block (C'1) of the styrene-butadiene-butylene-styrene copolymer (C ') was changed as shown in Table 9. The evaluation results of the fiber properties and the fabric properties of the obtained fiber are shown in Table 9.

Examples 55 to 59
The weight ratio (C'2 / C'3) of butadiene block (C'2) and butylene block (C'3) of styrene-butadiene-butylene-styrene copolymer (C ') was changed as shown in Table 9 A stretched yarn was produced in the same manner as in Example 48 except for the above. The evaluation results of the fiber properties and the fabric properties of the obtained fiber are shown in Table 9.

Examples 60 to 64
A drawn yarn was produced in the same manner as in Example 48 except that the composite ratio of the polyolefin (A), the polyester (B) and the styrene-butadiene-butylene-styrene copolymer (C ′) was changed as shown in Table 10. The evaluation results of the fiber characteristics and the fabric characteristics of the obtained fiber are shown in Table 10.

Examples 65 to 71
As polyester (B), in Example 65, polypropylene terephthalate (PPT) (Shell "Cortera" (registered trademark) CP 513000), and in Example 66, polybutylene terephthalate (PBT) (Toray "Trecone" (registered trademark) 1100 S) In Example 67, polyethylene naphthalate (PEN) (Toyobo Co., Ltd. PN 640), in Example 68 polylactic acid (PLA) (Natureworks 6201 D), in Example 69 polybutylene succinate (PBS) (Showa Denko "Bionore""(Registered trademark) 1010", in Example 70, polycaprolactone (PCL) ("Placcel" (registered trademark) H1 P, manufactured by Daicel), and in Example 71, polyglycolic acid (PGA) ("Kuredux", manufactured by Kureha (registered trademark) Except using 100R60), To prepare a drawn yarn in the same manner as 施例 48. The evaluation results of the fiber characteristics and the fabric characteristics of the obtained fiber are shown in Table 11.

Examples 72 to 76
As polyester (B), polyethylene terephthalate obtained by copolymerizing 5.0% by weight of polyethylene glycol (PEG) (PEG 1000 manufactured by Sanyo Chemical Industries, number average molecular weight 1000 g / mol) as a diol component in Example 72; As polyethylene terephthalate copolymerized with 30 mol% of 1,4-cyclohexanedimethanol (CHDM), polyethylene glycol obtained by copolymerizing 10 mol% of isophthalic acid (IPA) as a dicarboxylic acid component in Example 74, and as a dicarboxylic acid component in Example 75 Polyethylene terephthalate copolymerized with 1.5 mol% of sodium 5-sulfoisophthalate (SSIA); Example 76 uses 1,4-cyclohexanedicarboxylic acid (CHDC) as a dicarboxylic acid component Except for using the mol% copolymerized polyethylene terephthalate was produced a drawn yarn in the same manner as in Example 48. The evaluation results of the fiber properties and the fabric properties of the obtained fiber are shown in Table 12.

Examples 77 to 80
In Examples 48, 68, 73 and 75, drawn yarns are obtained in the same manner as in Examples 48, 68, 73 and 75 except that the polyolefin (A) is changed from polypropylene to polymethylpentene (PMP) (DX 820 manufactured by Mitsui Chemicals) Was produced. The evaluation results of the fiber properties and the fabric properties of the obtained fiber are shown in Table 12.

Examples 81 to 84
In Example 48, the composite spinneret is changed to change the cross-sectional composite form as shown in Table 13, and polyolefin (A), polyester (B), a composite of styrene-butadiene-butylene-styrene copolymer (C ') A drawn yarn was produced in the same manner as in Example 48 except that the ratio was changed as shown in Table 13. The evaluation results of the fiber characteristics and the fabric characteristics of the obtained fiber are shown in Table 13.

Examples 85 and 86
Examples 48, 82, except that the composite ratio of polyolefin (A), polyester (B), styrene-butadiene-butylene-styrene copolymer (C ') was changed as shown in Table 13 in Examples 48, 82. A drawn yarn was produced in the same manner as in. The evaluation results of the fiber characteristics and the fabric characteristics of the obtained fiber are shown in Table 13.

Example 87
Styrene-ethylene-butylene-styrene copolymer (C) (25 parts by weight of styrene block, ethylene block / butylene block = 0.25) and styrene-butadiene-butylene-styrene copolymer (C ') as compatibilizers A drawn yarn was produced in the same manner as in Example 1 except that (25 parts by weight of styrene block, butadiene block / butylene block = 0.25) was used. The evaluation results of the fiber characteristics and the fabric characteristics of the obtained fiber are shown in Table 14.

Examples 88 to 92
Example 87 except that functional groups of a styrene-ethylene-butylene-styrene copolymer (C) and a styrene-butadiene-butylene-styrene copolymer (C ′) were changed as compatibilizers as shown in Table 14 A drawn yarn was produced in the same manner as in. The evaluation results of the fiber characteristics and the fabric characteristics of the obtained fiber are shown in Table 14.

  The composite fiber of the present invention has both the properties of polyolefin and polyester, is excellent in mechanical properties and abrasion resistance, and is prevented from peeling and fluff and can be suitably used as a fiber structure.

1. Polymer 1
2. Polymer 2

Claims (9)

  A composite fiber comprising polyolefin (A) and polyester (B), which comprises styrene-ethylene-butylene-styrene copolymer (C) and / or styrene-butadiene-butylene-styrene copolymer (C ') Composite fiber characterized by   Styrene-100 parts by weight in total of polyolefin (A), polyester (B), styrene-ethylene-butylene-styrene copolymer (C) and / or styrene-butadiene-butylene-styrene copolymer (C ') The ethylene-butylene-styrene copolymer (C) and / or the styrene-butadiene-butylene-styrene copolymer (C ') is contained in an amount of 0.1 to 30.0 parts by weight. Composite fiber.   Styrene-ethylene-butylene-styrene copolymer (C) and / or styrene-butadiene-butylene-styrene copolymer (C ') is a styrene block (C1 and / or C'1) at 15.0 to 45. The composite fiber according to claim 1 or 2, which contains 0 parts by weight.   In the styrene-ethylene-butylene-styrene copolymer (C), the weight ratio (C2 / C3) of ethylene block (C2) to butylene block (C3) is 0.1 to 1.0, and styrene In the butadiene-butylene-styrene copolymer (C '), the weight ratio (C'2 / C'3) of the butadiene block (C'2) and the butylene block (C'3) is 0.1 to 1.0 The composite fiber according to any one of claims 1 to 3, characterized in that   Styrene-ethylene-butylene-styrene copolymer (C) and / or styrene-butadiene-butylene-styrene copolymer (C ') is at least one selected from an acid anhydride group, an amino group and an imino group The composite fiber according to any one of claims 1 to 4, which has a functional group.   The main components of the polyester (B) are a dicarboxylic acid component (B1) and a diol component (B2), and an aliphatic dicarboxylic acid (B1-1), an alicyclic dicarboxylic acid (B1-2) and an aromatic dicarboxylic acid At least one dicarboxylic acid component (B1) selected from (B1-3), an aliphatic diol (B2-1), an alicyclic diol (B2-2), and an aromatic diol (B2-3) The composite fiber according to any one of claims 1 to 5, which is at least one diol component (B2).   The main component of the polyester (B) is any one selected from aliphatic oxycarboxylic acids, alicyclic oxycarboxylic acids, and aromatic oxycarboxylic acids. Composite fiber according to any one of the preceding claims.   The cross-sectional composite form of the composite fiber is any one selected from a core-sheath type, an eccentric core-sheath type, a multiple core-sheath type, a sea-island type, a side-by-side type, and a multilayer bonding type. Composite fiber as described in any one of -7. The fiber structure which uses the composite fiber as described in any one of Claims 1-8 at least in part.