WO2021070740A1 - 芯鞘複合繊維およびマルチフィラメント - Google Patents

芯鞘複合繊維およびマルチフィラメント Download PDF

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Publication number
WO2021070740A1
WO2021070740A1 PCT/JP2020/037537 JP2020037537W WO2021070740A1 WO 2021070740 A1 WO2021070740 A1 WO 2021070740A1 JP 2020037537 W JP2020037537 W JP 2020037537W WO 2021070740 A1 WO2021070740 A1 WO 2021070740A1
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WIPO (PCT)
Prior art keywords
fiber
core
component
sheath
fibers
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Ceased
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PCT/JP2020/037537
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English (en)
French (fr)
Japanese (ja)
Inventor
松浦知彦
増田正人
川原慎也
藤田和哉
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Toray Industries Inc
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Toray Industries Inc
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Application filed by Toray Industries Inc filed Critical Toray Industries Inc
Priority to KR1020217041989A priority Critical patent/KR20220073702A/ko
Priority to US17/641,018 priority patent/US20220341060A1/en
Priority to EP20874251.0A priority patent/EP4043623A4/en
Priority to JP2020571859A priority patent/JP7585792B2/ja
Priority to CN202080066545.6A priority patent/CN114521216B/zh
Publication of WO2021070740A1 publication Critical patent/WO2021070740A1/ja
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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    • 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
    • D01F8/14—Conjugated, i.e. bi- or multicomponent, artificial filaments or the like; Manufacture thereof from synthetic polymers with at least one polyester 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
    • 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
    • D—TEXTILES; PAPER
    • D02—YARNS; MECHANICAL FINISHING OF YARNS OR ROPES; WARPING OR BEAMING
    • D02G—CRIMPING OR CURLING FIBRES, FILAMENTS, THREADS, OR YARNS; YARNS OR THREADS
    • D02G3/00—Yarns or threads, e.g. fancy yarns; Processes or apparatus for the production thereof, not otherwise provided for
    • D02G3/02—Yarns or threads characterised by the material or by the materials from which they are made
    • D02G3/04—Blended or other yarns or threads containing components made from different materials
    • D—TEXTILES; PAPER
    • D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
    • D04H—MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING ; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
    • D04H1/00—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres
    • D04H1/40—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties
    • D04H1/42—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties characterised by the use of certain kinds of fibres insofar as this use has no preponderant influence on the consolidation of the fleece
    • D04H1/4391—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties characterised by the use of certain kinds of fibres insofar as this use has no preponderant influence on the consolidation of the fleece characterised by the shape of the fibres
    • 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
    • D01D5/22—Formation of filaments, threads, or the like with a crimped or curled structure; with a special structure to simulate wool
    • 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
    • D01D5/253—Formation of filaments, threads, or the like with a non-circular cross section; Spinnerette packs therefor

Definitions

  • the present invention relates to a core-sheath composite fiber and a multifilament having a natural silk-like high-quality luster and suitable for obtaining a light, flexible and repulsive textile.
  • Synthetic fibers made of polyester, polyamide, etc. have excellent mechanical properties and dimensional stability, so they are widely used from clothing applications to non-clothing applications.
  • many uses such as clothing are required to have advanced textures and functions not found in conventional synthetic fibers.
  • the cross-sectional shape of the polyester fiber that reflects light at a relatively high degree is a multi-leaf-shaped irregular cross-section
  • the light reflection is amplified by the multi-leaf-shaped unevenness
  • the brightness is high like natural silk but mild.
  • It is known to be a glossy fiber, and is produced in large quantities as a typical example of silky material.
  • Various fiber technologies related to composite fibers pursuing the texture of silk are disclosed.
  • Patent Document 1 proposes a composite fiber having a multi-leaf shape in the cross section of the fiber and having an easily eluted component arranged at the apex of the multi-leaf shape in a tapered shape toward the inside of the fiber.
  • the groove is arranged at the apex of the multi-leaf shape, so that the light is reflected by the multi-leaf shape and the frictional force is increased by the groove, so that it looks like natural silk. It is said that it can reproduce the luxurious luster and dry feel, and the silk ringing that is a feature of textiles made of natural silk.
  • Patent Document 2 proposes a composite fiber in which an easy-eluting component is divided into a plurality of difficult-dissolving components in the cross section of the fiber.
  • the composite fiber one composite fiber is divided into a plurality of irregular cross-section fibers when the easily eluted component is eluted, so that the effect of increasing the diameter of the fine fiber and the effect of forming the irregular cross section are combined to form natural silk.
  • the high-class luster and dry feel it is possible to give a flexible texture.
  • a silky woven or knitted fabric can be obtained by a multifilament in which fibers having a shrinkage difference are mixed, and in Patent Document 3, at least two kinds of fibers having different heat shrinkage rates produced by a spinning mixed fiber method.
  • a shrinkage difference mixed fiber multifilament composed of the above has been proposed.
  • the shrinkage difference mixed fiber multifilament a fiber made of a copolymerized polyester is used on one side, and when heat is applied, a difference in yarn length occurs between the fiber groups due to the shrinkage difference, and the fabric has a rich bulge or the like. It is said that it can be given and used as a silky material.
  • Patent Document 1 by controlling the reflection and frictional force of light by forming a special cross-sectional shape using the elution component, the high-quality luster and dry feel peculiar to natural silk, and the peculiar silk Sounds can be reproduced to some extent.
  • the gaps between fibers may be insufficient, and single fibers are formed in a dense form on the fabric. For this reason, when worn as clothing, the light and flexible texture that feels comfortable may be insufficient.
  • Patent Document 2 the method of imparting flexibility to the fabric by reducing the flexural rigidity of each single fiber by increasing the diameter of the fine fibers such as elution division is from the viewpoint of imparting flexibility. It is valid.
  • the voids formed in the multifilament may be limited, and by further reducing the yarn diameter, the single fibers are likely to be densely packed depending on the structure of the fabric. For this reason, in order to obtain a light texture peculiar to natural silk, it may be necessary to precisely design the fabric, which may limit the material development.
  • the method of imparting swelling to the fabric by mixing fibers of different shrinkage as in Patent Document 3 is effective from the viewpoint of obtaining lightness due to the swelling, but at the time of picking up separate fibers or Since the fibers are mixed during thread processing, the fibers may be biased. As described above, when the fibers are unevenly distributed, for example, clogging may occur at a portion where the fibers on the high shrinkage side are unevenly distributed, and the flexible texture may be impaired.
  • an object of the present invention is to solve the above-mentioned problems of the prior art and to provide a core-sheath composite fiber and a multifilament suitable for obtaining a good textile approaching that of natural silk.
  • An object of the present invention is achieved by the following means. That is, In the fiber cross section of the core-sheath composite fiber composed of two or more kinds of polymers, the sheath component completely covers the multi-leaf-shaped core component having three or more convex portions, and the maximum thickness Smax and the minimum of the sheath component.
  • a fine interfiber gap of less than 5 ⁇ m and a coarse interfiber gap of 10 ⁇ m or more are used between each fiber, such as natural silk in the multifilament. It is possible to form a peculiar void structure in which the fibers are uniformly mixed, and it is possible to obtain a textile having a high-quality luster like natural silk, which is light, flexible and has a repulsive feeling.
  • A) (b) is an example of the schematic cross-sectional structure of the core-sheath composite fiber of the present invention.
  • A) (b) (c) It is an example of the schematic diagram of the cross-sectional structure of the composite fiber of the prior art.
  • A) (b) (c) This is an example of a schematic cross-sectional structure of the core-sheath composite fiber of the present invention.
  • A) (b) is an example of the schematic cross-sectional structure of the core-sheath composite fiber of the present invention.
  • (A) (b) is an example of the schematic diagram of the cross-sectional structure of the composite fiber of the prior art. This is an example of the crimped form of the crimped fibers constituting the multifilament of the present invention. It is an example of the schematic of the cross-sectional structure of the multifilament of this invention.
  • (A) is a diagram for understanding "uniformly mixed", and (b) is a diagram for understanding a method for measuring the average interfiber void distance.
  • (A) (b) is an example of the schematic cross-sectional structure of the crimpable fiber constituting the multifilament of the present invention.
  • (A) (b) is a schematic cross-sectional structure of an example of a core-sheath composite fiber capable of producing the multifilament of the present invention. It is the schematic of the cross-sectional structure of an example of a composite fiber capable of producing a multifilament of a prior art. It is sectional drawing of the composite base for demonstrating the manufacturing method of the core-sheath composite fiber and multifilament of this invention.
  • the size of the interfiber voids is 10 ⁇ m or more, the fibers fixed at the binding point of the woven or knitted fabric can be moved, so that the flexibility and the decrease in the apparent density at a high porosity can improve the lightness.
  • the size of the interfiber voids is 5 ⁇ m or more, the feeling of repulsion decreases due to the decrease in flexural rigidity. Therefore, in the conventional material which can form only the interfiber voids biased to either less than 5 ⁇ m or 10 ⁇ m or more, lightness, flexibility and repulsion are achieved. There is a trade-off relationship in feeling.
  • the present invention is constructed, and in the composite fiber of the present invention, a core-sheath composite composed of two or more kinds of polymers is used for the purpose of forming the peculiar interfiber voids played by the above-mentioned natural silk.
  • a core-sheath composite composed of two or more kinds of polymers is used for the purpose of forming the peculiar interfiber voids played by the above-mentioned natural silk.
  • the sheath component completely covers the multi-leaf-shaped core component having three or more convex portions, which is the first requirement of the present invention.
  • the core-sheath composite fiber referred to in the present invention is composed of two or more types of polymers, and has a cross-sectional shape in which the sheath component is installed so as to cover the core component in a cross section in a direction perpendicular to the fiber axis. Say fiber.
  • the core component and the sheath component constituting the core-sheath composite fiber of the present invention are excellent in processability when they are thermoplastic polymers
  • examples of the polymer group constituting the fiber include polyester-based, polyethylene-based, and polypropylene-based.
  • Polymers such as polyester-based, polyamide-based, polycarbonate-based, polymethyl methacrylate-based, and polyphenylene sulfide-based polymers and their copolymers are preferable. From the viewpoint that particularly high interfacial affinity can be imparted and fibers having no composite cross-sectional abnormality can be obtained, it is preferable that all the thermoplastic polymers used for the core-sheath composite fibers are the same polymer group and their copolymers. ..
  • the polymer contains various additives such as titanium oxide, silica, inorganic substances such as barium oxide, carbon black, colorants such as dyes and pigments, flame retardants, fluorescent whitening agents, antioxidants, and ultraviolet absorbers. You may be.
  • a plant-derived biopolymer or a recycled polymer in the present invention from the viewpoint of reducing the environmental load, and the polymer used in the present invention described above is chemically recycled.
  • Recycled polymers that have been recycled by either material recycling or thermal recycling can be used.
  • the polyester resin can make the characteristics of the present invention remarkable as its polymer characteristics, and as described above, bending rigidity close to that of natural silk and good color development can be obtained. From this point of view, recycled polyester can be suitably used in the present invention.
  • the core-sheath composite fiber of the present invention is intended to obtain a multifilament composed of a core component by eluting the sheath component after performing higher-order processing such as weaving. Therefore, it is preferable that the core component is difficult to elute and the sheath component is easily eluted with respect to the solvent used for elution of the sheath component, and the core component can be selected according to the application and used from there. Therefore, it is preferable to select the sheath component from the above-mentioned polymers. At this time, it can be said that the larger the elution rate ratio of the difficult-to-dissolve component (core component) and the easy-elution component (sheath component) to the solvent, the more suitable the combination is. ..
  • the sheath component for example, from a polymer that can be melt-molded such as polyester and its copolymer, polylactic acid, polyamide, polystyrene and its copolymer, polyethylene, and polyvinyl alcohol, and which exhibits easier elution than other components. It is preferable to select. Further, from the viewpoint of simplifying the elution step of the sheath component, the sheath component is preferably a copolymerized polyester, polylactic acid, polyvinyl alcohol, etc., which easily dissolves in an aqueous solvent or hot water, and in particular, has a crystalline property.
  • polyethylene glycol having a weight average molecular weight of 500 to 3000 is 5 wt% to 15 wt%.
  • Polyester copolymerized in the range is mentioned as a particularly preferable polymer.
  • the sheath component completely covers the multi-leaf-shaped core component having three or more convex portions.
  • a coarse interfiber gap of 10 ⁇ m or more is formed by sheath elution in the multi-leaf-shaped concave portion having a large sheath thickness.
  • fine interfiber voids of less than 5 ⁇ m in the convex portion having a small sheath thickness, it is possible to achieve a texture with a repulsive feeling while having a light and flexible texture peculiar to natural silk.
  • the effect of reflecting and amplifying light can be obtained by forming the uneven portion on the fiber surface, not only can the high-grade luster such as high brightness and mild luster like natural silk be exhibited, but also the unevenness on the fiber surface can be expressed. It is formed and a dry feel can be obtained. From this point of view, the more convex parts there are, the higher the effect of interfiber void formation, glossiness, and dry feeling. Therefore, for example, a three-leaf shape having three convex parts as shown in FIG. 2A and FIG. 2 ( A four-leaf shape having four convex portions as shown in b) is preferable.
  • the convex portions of the multi-leaf shape of the core component in the present invention is six.
  • the ratio of the minimum thickness Smin of the sheath component to the fiber diameter D from the viewpoint of forming fine interfiber voids of less than 5 ⁇ m that can move between adjacent single fibers by elution of the sheath component. It is preferably a composite fiber having an Smin / D of 0.01 or more.
  • the fiber diameter D means that a multifilament made of the core-sheath composite fiber of the present invention is embedded with an embedding agent such as epoxy resin, and the cross section of the fiber in the direction perpendicular to the fiber axis is subjected to a transmission electron microscope ( An image is taken at a magnification at which 10 or more fibers can be observed with TEM). At this time, when metal dyeing is applied, the contrast between the joint portion of the core component and the sheath component can be clarified by utilizing the dyeing difference between the polymers. A simple number average of the results of measuring the diameter of randomly selected fibers in the same image from each captured image to the first decimal place in ⁇ m units and performing this operation on 10 randomly selected fibers.
  • an embedding agent such as epoxy resin
  • the minimum thickness Smin of the sheath component referred to in the present invention is, for example, as shown in FIGS. 2 (a) and 5 (a), from the center of gravity G1 of the core component 1 existing on the cross section of the fiber to an arbitrary fiber surface.
  • a straight line is drawn toward, and the distance S1-F, which is the distance between the intersection S1 between the outer circumference of the core component 1 and the straight line and the intersection F between the fiber surface and the straight line, is obtained as a value measured to the first decimal place, and the obtained value is obtained.
  • the smallest value is calculated.
  • the core component 1 is different from the core component 1 having the center of gravity on a straight line drawn from the center of gravity G1 of the core component 1 toward an arbitrary fiber surface.
  • the distance between the intersection S1 between the outer circumference of the core component 1 and the straight line and the intersection S2 closest to S1 among the intersections between the outer circumference and the straight line of the core component 2 and S1-S2 are measured. The value was adopted.
  • G1 is the center of gravity of the core component 1
  • G2 is the center of gravity of the core component 2
  • G is a general term for them, and the same applies to other symbols.
  • the obtained woven or knitted fabric is fixed at the binding point of the woven or knitted fabric by sheath elution. It is preferable because it can develop fine interfiber voids of less than 5 ⁇ m so that the fibers can move and can impart a flexible texture. From this point of view, the higher the Smin / D, the larger the size of the fine interfiber voids of less than 5 ⁇ m, and the easier it is for the fibers to move. Therefore, if the Smin / D is 0.03 or more, the flexibility is further increased.
  • the increase makes it possible to express the high drape property peculiar to natural silk, which can be mentioned as a more preferable range.
  • the size of the interfiber voids becomes too large, the bending recovery property also decreases, and the repulsive feeling, which is one of the textures of natural silk, is impaired. Therefore, the practical upper limit in the present invention is 0.1. ..
  • the core component is made into a multi-leaf shape to eliminate the sheath. It is important to form coarse interfiber voids of 10 ⁇ m or more due to sheath elution in the thick multi-leaf-shaped recesses, and to form fine interfiber voids of less than 5 ⁇ m in the convex portions with a small sheath thickness. It is important to control the size of this maximum and minimum interfiber space.
  • the ratio Smax / Smin of the maximum thickness Smax and the minimum thickness Smin of the sheath component is 5.0 or more.
  • the maximum thickness Smax of the sheath component is, for example, as shown in FIGS. 2 (a) and 5 (a), from the center of gravity G1 of the core component 1 existing on the cross section of the fiber toward an arbitrary fiber surface.
  • a simple number average of the results of performing this operation on 10 randomly selected fibers was obtained, and the value rounded to the first decimal place was defined as the minimum thickness Smax ( ⁇ m) of the sheath component.
  • the core component 1 is different from the core component 1 having the center of gravity on a straight line drawn from the center of gravity G1 of the core component 1 toward an arbitrary fiber surface.
  • the distance between the intersection S1 between the outer circumference of the core component 1 and the straight line and the intersection S2 closest to S1 among the intersections between the outer circumference and the straight line of the core component 2 and S1-S2 are measured. The value was adopted.
  • the ratio Smax / Smin of the maximum thickness Smax of the sheath component corresponding to the coarse interfiber gap of 10 ⁇ m or more and the minimum thickness Smin corresponding to the fine interfiber gap of less than 5 ⁇ m is 5.0 or more.
  • Smax / Smin is set to 10.0 or more, an interfiber void size close to that of natural silk can be formed, and lightness closer to that of natural silk can be obtained, which is a more preferable range.
  • the practical upper limit of Smax / Smin is 30.0 because it may cause higher-order problems.
  • the area ratio of the sheath component in the core-sheath composite fiber of the present invention is preferably 10% to 50%.
  • the area occupied by the sheath component is increased, the effect of forming interfiber voids due to the elution of the sheath component is enhanced, so 10% or more is preferable, and 20% or more is more preferable.
  • the strength may decrease due to excessive elution of the sheath component and the elution treatment time may be long. Therefore, the practical upper limit is 50%. It becomes.
  • a fiber cross section is a true circle or ellipse shape, the inscribed circle diameter of the fiber R A (FIG. 4 (diameter A of a)) and the circumscribed circle diameter R B (FIG. 4
  • the relationship (diameter of B in (a)) is preferably 1.0 ⁇ R B / RA ⁇ 2.5.
  • R B / RA referred to here represents the degree of deformation of the fiber.
  • the core-sheath composite fiber of the present invention it is important to mix different interfiber voids in the formation of a multi-leaf shape by sheath elution, and before and after elution of the sheath component as shown in FIGS. 3 (a) and 3 (b). It is not a core-sheath composite fiber that changes in a similar manner, but a perfect circle as shown in FIGS. 2 (a), (b), 4 (b), (c), 5 (a), or 4 (a), It is preferable to use a multi-leaf-shaped core component in the elliptical core-sheath composite fiber as shown in FIG.
  • interfiber voids of 10 ⁇ m or more and interfiber voids of less than 5 ⁇ m can be mixed.
  • R B / RA representing the degree of deformation is 1.0 ⁇ R B / RA ⁇ 2.5
  • the core-sheath composite fiber of the present invention is likely to be most densely packed when it exists as a multifilament. Therefore, it is preferable from the viewpoint of quality control because the interfiber voids obtained after elution into the sheath component can be made uniform without unevenness.
  • the multi-leaf-shaped core component has a groove at the tip of the convex portion in the direction of the center of gravity of the core component.
  • the distance from the center of gravity G of the core component to the groove bottom M, the distance between the GM and the center of gravity G of the core component to the tip N of the convex portion, the ratio of GN, and GN / GM are preferably 1.1 to 1.5. ..
  • the distance from the center of gravity G of the core component to the groove bottom M is the intersection of any two straight lines having the area of the core component halved, for example, as shown in FIG. 5 (a).
  • the distance between the center of gravity of the core component, G1, and the center of gravity of the core component on the groove surface, the groove bottom, which is the closest point to G1, and M1 is calculated.
  • the largest value among the values obtained for each core component was adopted.
  • a simple number average of the results of performing this operation on 10 randomly selected fibers was calculated, and the value rounded to the first decimal place was taken as the distance from the center of gravity G of the core component to the groove bottom M, GM ( ⁇ m). did.
  • the distance from the center of gravity G of the core component to the tip N of the convex portion referred to in the present invention, GN is, for example, as shown in FIG. 5A, the center of gravity of the core component, G1, and the center of gravity of the core component on the groove surface.
  • the distance from the tip of the convex portion, which is the farthest point from G1, and N1 is calculated.
  • the largest value among the values obtained for each core component was adopted.
  • a simple number average of the results of performing this operation on 10 randomly selected fibers was obtained, and the value rounded to the first decimal place was the distance from the center of gravity G of the core component to the tip N of the convex portion, GN ( ⁇ m). And said.
  • GN / GM a simple numerical average of the ratio (GN / GM) is calculated.
  • the calculated value rounded to the third decimal place was defined as GN / GM.
  • the tip of the convex portion has a groove having a depth of 1.1 or more in the direction of the center of gravity of the core component, so that the groove surface comes into contact with the skin at a point.
  • the groove depth is set to 1.3 or more for GN / GM, light will be reflected diffusely in addition to a dry feeling, and not only will the gloss be milder, but also white blur due to specular reflection of light will be suppressed. It is mentioned as a more preferable range because it also improves the color-developing property when dyed.
  • the groove depth is increased, the frictional force becomes too high, which may cause deterioration of wear resistance such as fibrilization. Therefore, the practical upper limit of GN / GM is 1.5. is there.
  • the core component is divided into two or more by the sheath component. It is preferable that each of the divided core components has the above-mentioned multi-leaf shape.
  • fibroin (a in FIG. 1), which is a difficult-to-elut component having two triangular cross sections, is covered with sericin (b), which is an easy-eluting component. It has a cross-sectional shape of the fiber. That is, the voids between the divided and adjacent fibers are always controlled only by the ratio of sericin elution, regardless of the arrangement of the single fibers in the multifilament, and this is one by one of the single fibers peculiar to natural silk.
  • the core component is divided into two or more by the sheath component. It is preferable that each of the divided core components has a multi-leaf shape.
  • the number of divisions is not particularly limited as long as it is two or more, and for example, as shown in FIG. 4C, it may be divided into six core components, but as the number of divisions increases, it is obtained. In addition to making the interfiber gaps smaller, it becomes difficult to precisely control the cross section, so that the upper limit of the actual number of divisions is 10.
  • the interfiber voids in order to make the interfiber voids coarser, polymers having different melting points are arranged next to each other in the cross section of the fiber, and the core-sheath composite fiber is crimped due to the difference in shrinkage during heat treatment due to the difference in melting point. Or, it is preferable to develop a yarn length difference after eluting the sheath component of the core-sheath composite fiber. If the interfiber voids can be coarsened, not only will the diffused reflection of light increase to obtain a high-quality luster and high color development, but also the porosity will increase and the apparent density will decrease, resulting in lightness. Can be emphasized more.
  • the core component 1 for example, c1 in FIGS. 4 (a), (b), and (c)
  • the core component 2 for example, c1 in FIGS.
  • c2 of FIGS. 4 (a), (b), and (c) is made of polymers having different melting points.
  • the polymers having different melting points include a group of melt-moldable polymers such as polyester-based, polyethylene-based, polypropylene-based, polystyrene-based, polyamide-based, polycarbonate-based, polymethylmethacrylate-based, and polyphenylene sulfide-based polymers and their co-weights.
  • melt-moldable polymers such as polyester-based, polyethylene-based, polypropylene-based, polystyrene-based, polyamide-based, polycarbonate-based, polymethylmethacrylate-based, and polyphenylene sulfide-based polymers and their co-weights.
  • a combination of polymers having different melting points of 10 ° C. or more from among the coalesced products.
  • the core-sheath composite fiber of the present invention a crimped form is exhibited in the core-sheath composite fiber by utilizing the shrinkage difference of the core component, or a thread length difference is developed after the sheath component of the core-sheath composite fiber is eluted. Therefore, as a combination of polymers having different melting points of the core components, it is preferable to use the core component 1 as a high shrinkage low melting point polymer and the core component 2 as a low shrinkage high melting point polymer.
  • Examples of the combination of the low melting point polymer and the high melting point polymer include copolymerized polyethylene terephthalate / polyethylene terephthalate, polybutylene terephthalate / polyethylene terephthalate, polytrimethylene terephthalate / polyethylene terephthalate, thermoplastic polyurethane / polyethylene terephthalate, and polyester elastomer / Polyethylene terephthalate, polyester elastomer / polybutylene terephthalate, polyamide 66 / nylon 610, nylon 6-nylon 66 copolymer / nylon 6 or 610, PEG copolymer nylon 6 / nylon 6 or 610, thermoplastic polyurethane / nylon 6 or 610, various combinations such as ethylene-propylene rubber finely dispersed polypropylene / polypropylene, propylene- ⁇ -olefin copolymer / polypropylene, etc.
  • the core component to be divided is a polymer-based combination.
  • the copolymerization component in the copolymerized polyethylene terephthalate include succinic acid, adipic acid, azelaic acid, sebacic acid, 1,4-cyclohexanedicarboxylic acid, maleic acid, phthalic acid, isophthalic acid, 5-sodium sulfoisophthalic acid and the like.
  • polyethylene terephthalate in which 5 mol% to 15 mol% of isophthalic acid is copolymerized.
  • the area ratio of the core component 1 which is a low melting point polymer and the core component 2 which is a high melting point polymer in the core-sheath composite fiber of the present invention is 70% / 30% to 30% / 70% for the core component 1 / core component 2. It is preferably in the range of. Within this range, the core-sheath composite fiber may be crimped or the sheath of the core-sheath composite fiber without being affected by texture hardening due to clogging when the low-melting-melting polymer shrinks to a high degree by heat treatment. After the components are eluted, the difference in yarn length can be sufficiently expressed, and more coarse interfiber voids can be obtained.
  • the core-sheath composite fiber of the present invention is obtained by once forming various sheet-like fiber structures such as woven and knitted fabrics, non-woven fabrics, and papermaking, and then eluting the sheath component to obtain a multifilament composed of the core component.
  • the multifilament it is possible to obtain the texture of natural silk such as the unique cross-sectional shape of fibers, the luxurious luster and dry feel developed from the interfiber gaps, and the light, flexible and repulsive texture. Become.
  • the interfiber void distance referred to in the present invention refers to 10 fibers cross sections of a fabric made of multifilaments, which are perpendicular to the length direction of the fabric and perpendicular to the fiber axis direction of the multifilaments, with a scanning electron microscope (SEM). An image is taken at a magnification at which the above fibers can be observed. For each photographed image, draw a perfect circle in which 10 fibers fit as shown in FIG. 8 (b), select an arbitrary fiber from the 10 fibers existing inside the perfect circle, and use the fiber. The intersections of the straight lines connecting the centers of gravity of adjacent fibers and the surfaces of the respective fibers were obtained, and the distance between the intersections was measured up to the first digit of the circle in ⁇ m.
  • SEM scanning electron microscope
  • the value obtained by rounding off the first decimal place of the obtained value was defined as the interfiber void distance ( ⁇ m).
  • adjacent as used herein means that no other fiber exists on the straight line connecting the centers of gravity of any two fibers. This operation is performed on all the adjacent fibers in 10 fibers existing inside the perfect circle, the simple number average of the result is obtained, and the value rounded to the first decimal place.
  • the ratio of the gap distance between fibers to be less than 5 ⁇ m was also calculated.
  • the average gap distance between fibers needs to be 5 ⁇ m or more. is there. Furthermore, if the average gap distance between fibers is 10 ⁇ m or more, the bulkiness is exhibited, which reduces the apparent density of the fabric and also has the effect of improving lightness. Therefore, it is light and flexible, which is close to that of natural silk. Since the texture can be expressed, it is mentioned as a preferable range.
  • the ratio of the interfiber gap distance in order to suppress the decrease in flexural rigidity due to the increase in the average clearance distance and maintain the feeling of repulsion, it is necessary to set the ratio of the interfiber gap distance to less than 5 ⁇ m to 10% or more. Furthermore, if the ratio of the gap distance between fibers is less than 5 ⁇ m is 20% or more, the trade-off relationship between lightness and flexibility and repulsion is eliminated, and a light, flexible and repulsive texture can be expressed in a well-balanced manner. Therefore, it is mentioned as a preferable range. From this point of view, if the ratio of the interfiber gap distance of less than 5 ⁇ m is increased, the repulsive feeling is improved, but the lightness and flexibility tend to decrease. Therefore, the ratio of the interfiber gap distance of less than 5 ⁇ m is practically 50%. It becomes the upper limit.
  • the multifilament of the present invention preferably has a porosity of 30 to 80%.
  • the void ratio referred to in the present invention means that in a fabric made of multifilaments, a scanning electron microscope (SEM) has 10 or more cross sections of the fabric perpendicular to the length direction of the fabric and perpendicular to the fiber axis direction of the multifilaments. The image is taken at a magnification at which the fibers can be observed. As shown in FIG. 8B, a perfect circle containing 10 fibers was drawn for each image taken, and the total cross-sectional area of 10 fibers existing inside the perfect circle was subtracted from the cross-sectional area of the perfect circle. The value was calculated.
  • SEM scanning electron microscope
  • the cross-sectional area was measured in ⁇ m 2 units up to the first decimal place. Further, a value obtained by dividing the obtained value by the cross-sectional area of a perfect circle was calculated, and the value obtained by multiplying by 100 and then rounding off the first decimal place was defined as the porosity (%).
  • the multifilament has a porosity of 30% or more because a space is created in which the fibers fixed at the binding point of the woven or knitted fabric can move, and the effect of improving flexibility can be obtained.
  • the porosity is 50% or more
  • the high porosity reduces the apparent density of the fabric and adds the effect of improving lightness, so it is light and flexible, which is close to natural silk. It is mentioned as a more preferable range because it can express a good texture.
  • the higher the average interfiber void distance and porosity the better the lightness and flexibility, while the effect of suppressing the decrease in flexural rigidity in interfiber voids of less than 5 ⁇ m uniformly mixed in the multifilament becomes smaller. Since the feeling of repulsion tends to decrease, having a void structure having a porosity of 80% is a substantial upper limit.
  • the multifilament of the present invention it is preferable that the multifilament is composed of two or more types of crimpable fibers composed of polymers having different melting points, and the crimpable fibers are uniformly mixed.
  • the crimpable fiber referred to in the present invention means that the fiber has a twisted crimped form as shown in FIG.
  • FIGS. A method for bundling a plurality of core-sheath composite fibers as shown in FIGS.
  • FIGS. A plurality of core-sheath composite fibers in which core components made of polymers having different melting points as in (c) are arranged next to each other are bundled, the sheath components are eluted and divided, and then a difference in thread length is expressed by heat treatment.
  • FIGS. There are various methods such as the method of causing the fibers to be mixed, but from the viewpoint of more uniformly mixing the fine interfiber gaps of less than 5 ⁇ m and the coarse interfiber gaps of 10 ⁇ m or more in the multifilament, FIGS.
  • a crimped morphology is developed by bundling a plurality of core-sheath composite fibers in which the core components c1 and c2 are composed of polymers having different melting points, and the cross section of the fiber is divided into two by the sheath component d. It is preferable to use a method in which the crimped fibers composed of different polymers are uniformly mixed by elution of the sheath component thereafter and dividing each polymer.
  • the core-sheath composite fiber is heat-treated to develop a crimped morphology, and a coarse interfiber gap of 10 ⁇ m or more can be formed. Furthermore, since the sheath component is present between the core components, after the sheath component is eluted, interfiber voids of less than 5 ⁇ m are more stably formed between the crimped fibers made of adjacent polymers having different melting points. Therefore, fine interfiber voids of less than 5 ⁇ m and coarse interfiber voids of 10 ⁇ m or more can be more uniformly mixed in the multifilament.
  • the multifilament of the present invention it is preferable that the multifilament is composed of two or more types of crimpable fibers composed of polymers having different melting points, and the crimpable fibers are uniformly mixed, whereby the unique fiber.
  • the texture of natural silk such as the luxurious luster and dry feel expressed from the cross-sectional shape and void structure, and the light, flexible and repulsive texture, can be further emphasized.
  • the crimpable fiber has a number of crimped ridges of 5 ridges / cm or more.
  • the excluded volume effect between fibers can be sufficiently exerted, and a coarse interfiber void of several tens of ⁇ m can be formed. Furthermore, if it is set to 10 ridges / cm or more, the exclusion volume effect between the fibers is further enhanced, so that the size of the interfiber voids can be made coarser, and a light and flexible texture close to that of natural silk can be exhibited. , A more preferred range.
  • the number of crimped ridges increases, the steric hindrance effect due to the crimped form exceeds the excluded volume effect, resulting in entanglement between fibers, which may impair flexibility.
  • the upper limit of the number of mountains is 100 mountains / cm.
  • the difference in yarn length between two or more types of crimpable fibers composed of different polymers is 3% or more.
  • the number of crimped ridges of the crimpable fibers composed of polymers having different melting points expressing the crimped morphology can be set to 10 ridges / cm or more.
  • the upper limit of the thread length difference is 20%.
  • the crimpable fiber is composed of a single polymer. If the crimpable fibers are composed of a single polymer, the core-sheath composite fibers composed of adjacent polymers having different melting points develop a crimped morphology by heat treatment, so that the crimped phases of the adjacent crimped fibers are different. It is possible to form fine interfiber voids of less than 5 ⁇ m. On the other hand, when composed of two or more different polymers, the center of gravity of the polymer on the cross section differs depending on the composite cross section, so that the fibers composed of adjacent polymers having different melting points have different windings after eluting the sheath component. Since the crimpable fibers have a crimped form, the crimped phases are not aligned, and it becomes difficult to stably form fine interfiber voids of less than 5 ⁇ m.
  • the fiber constituting the multifilament of the present invention preferably has a multi-leaf shape having three or more convex portions in the cross section of the fiber.
  • the cross section of the fiber has a multi-leaf shape having three or more convex portions, the effect of reflecting and amplifying light can be obtained by forming uneven portions on the fiber surface, and the above-mentioned large and small size interfiber gaps exist. Combined with the complicated reflection of light, it is possible to develop a high-class luster such as high brightness and mild luster like natural silk. Further, by improving the frictional force due to the formation of irregularities on the fiber surface, it is possible to obtain a dry tactile sensation. From this point of view, the more convex parts there are, the higher the gloss effect and dry feeling, but if the number of uneven parts becomes too large, the intervals between the uneven parts become finer, and the effect gradually approximates to a round cross section. Therefore, the practical upper limit of the convex portions of the fibers constituting the multifilament of the present invention is six.
  • the relationship between the inscribed circle diameter RC (diameter C in FIG. 9 (a)) and the circumscribed circle diameter R D (diameter D in FIG. 9 (a)) is 1. It is preferable that .5 ⁇ R D / RC ⁇ 2.0. However, R D / RC referred to here represents the degree of deformation of the fiber. Within this range, the light reflected and amplified by the multi-leaf-shaped uneven portion is uniformly reflected without glare, which is preferable from the viewpoint of quality control.
  • the fiber constituting the multifilament of the present invention has a groove at the tip of the convex portion in the cross section of the fiber from the viewpoint of emphasizing a dry tactile sensation, from the groove bottom M to the convex tip N.
  • the distance and the ratio of MN to fiber diameter D (MN / D) are preferably 0.04 to 0.20.
  • the distance from the groove bottom M to the convex tip N and the ratio of MN to fiber diameter D (MN / D) in the present invention are determined by embedding the multifilament of the present invention with an embedding agent such as epoxy resin and fiber.
  • the cross section of the fiber in the direction perpendicular to the axis can be obtained by taking an image at a magnification at which 10 or more fibers can be observed with a scanning electron microscope (SEM).
  • SEM scanning electron microscope
  • any two straight lines that halve the cross-sectional area of the crimpable fibers in the fiber cross section From the center of gravity G, which is the intersection, the distance between the groove bottom M, which is the closest point to the groove surface, and the convex tip tip N, which is the farthest point, and MN were calculated.
  • the diameter of the fiber was measured in ⁇ m units up to the first decimal place. At this time, if the cross section of the fiber in the direction perpendicular to the fiber axis is not a perfect circle, the area was measured and the value obtained in terms of yen was adopted as the fiber diameter.
  • the fibers constituting the multifilament of the present invention have grooves having a depth of 0.04 or more in MN / D, so that the surface of the grooves comes into contact with the skin at points to improve the frictional force, resulting in a dry feeling. It is preferable because it can emphasize a certain tactile sensation. Furthermore, if the groove depth is set so that the MN / D is 0.10 or more, light is diffusely reflected in addition to a dry feeling, which not only gives a milder luster but also suppresses white blur due to specular reflection of light. It is mentioned as a more preferable range because it also improves the color-developing property when dyed. However, if the groove depth is increased, the frictional force becomes too high, which may cause deterioration of wear resistance such as fibrilization. Therefore, the practical upper limit of MN / D is 0.20. is there.
  • the fiber diameter is preferably 15 ⁇ m or less from the viewpoint of making the texture more flexible. Furthermore, by setting the fiber diameter to 12 ⁇ m or less, the fineness of the single yarn of natural silk approaches about 10 ⁇ m, and a feel closer to that of natural silk can be obtained. Therefore, it is used for general clothing such as inners, shirts, and blouses that come into contact with the skin. It is a suitable range for. However, if the fiber diameter is too small, the bending recovery property is lowered, and not only the repulsive feeling, which is one of the textures of natural silk, is impaired, but also the color development property may be lowered. Therefore, the fiber diameter is 8 ⁇ m or more. It is preferable to do so.
  • the core-sheath composite fiber and the multifilament of the present invention fine fiber fine voids of less than 5 ⁇ m and coarse interfiber voids of several tens of ⁇ m are uniformly mixed between each fiber as played by natural silk.
  • a peculiar void structure can be formed. Therefore, if the core-sheath composite fiber or multifilament of the present invention is used as a textile product in which at least one part is formed, various textures peculiar to natural silk can be reproduced.
  • synthetic fibers from general clothing such as jackets, skirts, pants, and underwear, to sports clothing, clothing materials, interior products such as carpets, sofas, and curtains, and vehicle interiors such as car seats. It can be suitably used for a wide variety of textile products such as goods, cosmetics, cosmetic masks, wiping cloths, and health goods for daily use.
  • a melt spinning method for producing long fibers As a method for producing a core-sheath composite fiber of the present invention composed of two or more kinds of polymers, a melt spinning method for producing long fibers, a solution spinning method such as wet and dry wet, and a sheet-shaped fiber structure are obtained.
  • the melt spinning method is preferable from the viewpoint of increasing productivity.
  • the melt spinning method it can be produced by using a composite mouthpiece described later, and the spinning temperature at that time is the temperature at which the high melting point or high viscosity polymer mainly exhibits fluidity among the polymer types used. To do. The temperature at which this fluidity is exhibited varies depending on the molecular weight, but stable production can be achieved by setting the temperature between the melting point of the polymer and the melting point of + 60 ° C.
  • the spinning speed should be about 500 to 6000 m / min, and can be changed depending on the physical characteristics of the polymer and the purpose of use of the fiber.
  • the preheating temperature is preferably a temperature at which the yarn path disorder does not occur due to the spontaneous elongation of the fibers in the preheating process.
  • this preheating temperature is usually set to about 80 to 95 ° C.
  • the discharge amount per single hole of the core-sheath composite fiber of the present invention is about 0.1 to 10 g / min / hole, stable production becomes possible.
  • the discharged polymer stream is cooled and solidified, oiled, and taken up by a roller having a specified peripheral speed. Then, it is stretched by a heating roller to obtain a desired core-sheath composite fiber.
  • the melt viscosity ratio of the polymer used is less than 5.0 and the difference in solubility parameter value is less than 2.0, so that the composite is stably composited. It is preferable because a polymer stream can be formed and fibers having a good composite cross section can be obtained.
  • the composite base used when producing the core-sheath composite fiber of the present invention composed of two or more kinds of polymers it is preferable to use the composite base described in Japanese Patent Application Laid-Open No. 2011-208313.
  • the composite base shown in FIG. 12 of the present application is incorporated into a spinning pack in a state in which three major types of members, a measuring plate 1, a distribution plate 2, and a discharge plate 3 are laminated from above, and is used for spinning.
  • FIG. 12 is an example in which three types of polymers such as A polymer, B polymer, and C polymer are used. It is difficult to composite three or more types of polymers with a conventional composite base, and it is preferable to use a composite base using a fine flow path as illustrated in FIG.
  • the measuring plate 1 measures the amount of polymer per each discharge hole and each distribution hole and flows in, and the distribution plate 2 controls the composite cross section and the cross-sectional shape thereof in the cross section of the single fiber.
  • the discharge plate 3 plays a role of compressing and discharging the composite polymer flow formed by the distribution plate 2.
  • a member having a flow path may be used according to the spinning machine and the spinning pack. ..
  • the existing spinning pack and its member can be utilized as it is. Therefore, it is not necessary to monopolize the spinning machine especially for the mouthpiece.
  • the composite polymer stream discharged from the discharge plate 3 is cooled and solidified according to the above-mentioned production method, oiled, and taken up by a roller having a specified peripheral speed. After that, it is stretched with a heating roller to obtain a desired core-sheath composite fiber.
  • the sheath component In the case of producing a multifilament composed of a core component by removing the sheath component from the core-sheath composite fiber of the present invention, it is necessary to elute the sheath component to obtain a fiber composed of the core component, and for that purpose, an easily eluted component.
  • the sheath component may be removed by immersing the core-sheath composite fiber in a solvent or the like capable of dissolving the core-sheath.
  • an alkaline aqueous solution such as an aqueous sodium hydroxide solution can be used.
  • a fluid dyeing machine or the like a large amount of processing can be performed at one time, which is preferable from an industrial point of view.
  • melt Viscosity of Polymer The melt viscosity of the chip-shaped polymer was measured by vacuum drying the polymer to a moisture content of 200 ppm or less and gradually changing the strain rate by a capillograph manufactured by Toyo Seiki. The measurement temperature was the same as the spinning temperature, and the period from when the sample was put into the heating furnace in a nitrogen atmosphere to the start of measurement was 5 minutes, and the value of the shear rate 1216s -1 was evaluated as the melt viscosity of the polymer.
  • the chip-shaped polymer has a moisture content of 200 ppm or less by vacuum drying, weighs about 5 mg, and rises from 0 ° C to 300 ° C using a differential scanning calorimeter (DSC) Q2000 manufactured by TA Instruments. After raising the temperature at a temperature rate of 16 ° C./min, the temperature was maintained at 300 ° C. for 5 minutes for DSC measurement. The melting point was calculated from the melting peak observed during the heating process. The measurement was performed 3 times per sample, and the average value was taken as the melting point. When a plurality of melting peaks were observed, the melting peak top on the highest temperature side was taken as the melting point.
  • DSC differential scanning calorimeter
  • the weight of the multifilament having a fineness of 100 m was measured, and the value was calculated by multiplying the value by 100. This operation was repeated 10 times, and the value obtained by rounding off the second decimal place of the average value was taken as the fineness (dtex) of the multifilament.
  • Section parameters (R B / R A) The core-sheath composite fiber is embedded with an embedding agent such as epoxy resin, and the cross section of the fiber in the direction perpendicular to the fiber axis is imaged as a magnification at which 10 or more fibers can be observed with a scanning electron microscope (SEM) manufactured by Hitachi. I took a picture.
  • SEM scanning electron microscope
  • the ratio of the minimum thickness Smin of the sheath component to the fiber diameter D, Smin / D, the maximum thickness of the sheath component, the minimum thickness of Smax and the sheath component, the ratio of Smin, and Smax / Smin were calculated.
  • the diameter of fibers randomly selected from each photographed image in the same image is measured in ⁇ m units up to the first decimal place, and this operation is performed on 10 randomly selected fibers. A simple number average of the results was obtained, and the value rounded to the first decimal place was taken as the fiber diameter D ( ⁇ m).
  • D the fiber diameter
  • the cross section of the fiber in the direction perpendicular to the fiber axis is not a perfect circle, the area is measured and the value obtained in terms of yen is adopted.
  • the minimum thickness Smin of the sheath component in the present invention is, for example, as shown in FIGS. 2 (a) and 5 (a), a cross section of fibers randomly extracted in the same image from each photographed image.
  • the core component 1 is different from the core component 1 having the center of gravity on a straight line drawn from the center of gravity G1 of the core component 1 toward an arbitrary fiber surface.
  • the distance S1-S2 between the intersection S1 between the outer circumference of the core component 1 and the straight line and the intersection S2 closest to S1 among the intersections between the outer circumference and the straight line of the core component 2 was measured. Adopted the value.
  • the minimum thickness of the sheath component, Smax, in the present invention is defined as, for example, as shown in FIGS. 2 (a) and 5 (a), crossing fibers randomly extracted in the same image from each photographed image.
  • a straight line is drawn from the center of gravity G1 of the core component 1 existing on the surface toward an arbitrary fiber surface, and the distance between the intersection S1 between the outer circumference of the core component 1 and the straight line and the intersection F between the fiber surface and the straight line, S1-F, is set. , The value measured up to the first decimal place is obtained, and the maximum value among the obtained values is calculated.
  • the core component 1 is different from the core component 1 having the center of gravity on a straight line drawn from the center of gravity G1 of the core component 1 toward an arbitrary fiber surface.
  • the intersection S1 between the outer circumference of the core component 1 and the straight line, the intersection closest to S1 among the intersections between the outer circumference and the straight line of the core component 2, the distance from S2, and S1-S2 are set. The measured value was adopted.
  • the distance from the center of gravity G of the core component to the groove bottom M in the present invention, GM is, for example, at the intersection of two arbitrary straight lines having the area of the core component halved, as shown in FIG. 5A.
  • the distance between the center of gravity G1 of a certain core component and the groove bottom M1 which is the closest point to the center of gravity G1 of the core component on the groove surface is calculated.
  • the largest value among the values obtained for each core component was adopted.
  • a simple number average of the results of performing this operation on 10 randomly selected fibers was calculated, and the value rounded to the first decimal place was taken as the distance from the center of gravity G of the core component to the groove bottom M, GM ( ⁇ m). did.
  • the distance from the center of gravity G of the core component to the tip N of the convex portion in the present invention, GN is the most in the center of gravity G1 of the core component and the center of gravity G1 of the core component on the groove surface, as shown in FIG. 5A, for example.
  • the distance from the tip N1 of the convex portion, which is a distant point, is calculated.
  • the largest value among the values obtained for each core component was adopted.
  • a simple number average of the results of performing this operation on 10 randomly selected fibers was obtained, and the value rounded to the first decimal place was the distance from the center of gravity G of the core component to the tip N of the convex portion, GN ( ⁇ m). And said.
  • G Mixed state of fibers in multifilament
  • a cross section of the fabric perpendicular to the length direction of the fabric and perpendicular to the fiber axis direction of the multifilament is measured by a scanning electron microscope (SEM) manufactured by HITACHI with 10 or more fibers. Take an image at a magnification that can be observed.
  • SEM scanning electron microscope
  • A Uniformly mixed (one or more fibers Y composed of a polymer different from fiber X)
  • C Unbalanced mixture (less than one fiber Y composed of a polymer different from the fiber X).
  • the multifilaments are extracted from the fabric so as not to be plastically deformed, one end of the multifilaments is fixed, and a load of 1 mg / dtex is applied to the other end after 30 seconds or more. Markings were made at arbitrary points where the distance between the two points in the fiber axis direction of the multifilament was 1 cm. After that, the fibers were separated from the multifilament so as not to be plastically deformed, adjusted so that the space between the markings made in advance was the original 1 cm, and fixed on the slide glass, and this sample was fixed on the slide glass, and this sample was VHX-2000 manufactured by KEYENCE.
  • J. Interfiber void distance In a fabric made of multifilaments, a magnification at which 10 or more fibers can be observed with a scanning electron microscope (SEM) manufactured by HITACHI on the cross section of the fabric perpendicular to the length direction of the fabric and perpendicular to the fiber axis direction of the multifilaments. Take an image as. By analyzing the captured image using computer software, WinROOF manufactured by Mitani Shoji, a perfect circle containing 10 fibers is drawn as shown in FIG. 8 (b), and the fibers 10 existing inside the perfect circle are drawn.
  • SEM scanning electron microscope
  • the cross-sectional area was measured in ⁇ m 2 units up to the first decimal place. Further, a value obtained by dividing the obtained value by the cross-sectional area of a perfect circle was calculated, and the value obtained by multiplying by 100 and then rounding off the first decimal place was defined as the porosity (%).
  • the distance from the groove bottom M to the convex tip N and the ratio of MN to fiber diameter D (MN / D) referred to in the present invention are perpendicular to the fiber axis by embedding the multifilament with an embedding agent such as epoxy resin.
  • the cross section of the fiber in the direction can be obtained by taking an image at a magnification at which 10 or more fibers can be observed with a scanning electron microscope (SEM) manufactured by Hitachi.
  • SEM scanning electron microscope
  • the diameter D of the fiber was measured in ⁇ m units up to the first decimal place. At this time, if the cross section of the fiber in the direction perpendicular to the fiber axis is not a perfect circle, the area is measured and the value obtained in terms of yen is adopted as the fiber diameter D.
  • the ratio (MN / D) of the obtained distance from the groove bottom M to the convex tip N, MN and fiber diameter D was calculated to the fourth decimal place, and this operation was randomly selected for 10 fibers. A simple number average of the results was obtained, and the value rounded to the third decimal place was defined as MN / D.
  • the obtained woven fabric was evaluated for five textures of glossiness, lightness, flexibility, resilience, and dryness by using the following methods.
  • the thickness (cm) of a woven fabric of 20 cm x 20 cm is measured using a constant pressure thickness measuring device (PG-14J) manufactured by Telotech, the volume of the woven fabric is calculated, and then the weight (g) of the woven fabric is calculated. The value divided by the obtained volume was taken as the apparent density of the woven fabric (g / cm 3 ). From the obtained apparent density, the lightness was judged in three stages based on the following criteria.
  • a 20 cm x 20 cm woven fabric is gripped with an effective sample length of 20 cm x 1 cm using a Katotech pure bending tester (KES-FB2), and the maximum curvature in the weft direction is ⁇ 2.5 cm -1 .
  • the bending moment per unit width of curvature 0.5 cm -1 and 1.5cm -1 (gf ⁇ cm / cm ) value difference divided by the curvature difference 1 cm -1 of the curvature -0.5cm the difference in bending moment per unit width of -1 and -1.5cm -1 (gf ⁇ cm / cm ) was calculated average value of the value obtained by dividing the curvature difference 1 cm -1.
  • This operation was performed 3 times per location, and a simple number average was obtained as a result of performing this operation for a total of 10 locations.
  • the value divided by 100 was the bending hardness B ⁇ 10-2 ( gf ⁇ cm 2 / cm). From the obtained bending hardness B ⁇ 10-2 , the flexibility was judged in three stages based on the following criteria.
  • a load of 50 g is applied to a 1 cm x 1 cm terminal wound with a piano wire in a 10 cm x 10 cm range of a 20 cm x 20 cm woven fabric using an automated surface tester (KES-FB4) manufactured by Katou Tech.
  • KS-FB4 automated surface tester manufactured by Katou Tech.
  • the average coefficient of friction MIU was obtained by sliding at a speed of 1.0 mm / sec. This operation was performed three times per location, and a simple number average was obtained as a result of performing this operation for a total of 10 locations, and the value rounded to the second decimal place was used as the coefficient of friction. From the obtained friction coefficient, the dry feeling was judged in three stages based on the following criteria.
  • the number of fibers was adjusted so that the cover factor (CFA) in the warp direction was 800 and the cover factor (CFB) in the weft direction was 1200, and eight satin fabrics were prepared.
  • the obtained woven fabric was dyed black with the disperse dye Sumikaron Black S-3B (10% owf).
  • the dyed woven fabric was evaluated for L value from the reflection measurement of the woven fabric using CM-3700A manufactured by Konica Minolta. This operation was measured three times per location, and a simple number average was obtained as a result of performing this operation for a total of 10 locations, and the value rounded to the first decimal place was taken as the black-stained L value. From the obtained black dyeing L value, the color development property was judged in three stages based on the following criteria.
  • a plain woven fabric was prepared by adjusting the number of fibers so that the cover factor (CFA) in the warp direction was 1100 and the cover factor (CFB) in the weft direction was 1100.
  • the obtained woven fabric was dyed black with the disperse dye Sumikaron Black S-3B (10% owf).
  • the dyed woven fabric was cut into a circle with a diameter of 10 cm, moistened with distilled water, and attached to a disk. Further, the woven fabric cut into 30 cm squares was fixed on a horizontal plate while being dried.
  • a disk with a woven fabric moistened with distilled water is brought into horizontal contact with the woven fabric fixed on a horizontal plate, and the center of the disk draws a circle with a diameter of 10 cm at a load of 420 g and a speed of 50 rpm.
  • the disk was circularly moved for 10 minutes and the two fabrics were rubbed.
  • the degree of discoloration of the woven fabric attached to the disk was judged to be grades 1 to 5 in 0.5 grade increments using a gray scale for discoloration. From the obtained grade judgment results, the wear resistance was judged in three stages based on the following criteria.
  • Example 1 As polymer 1, 8 mol% of 5-sodium sulfoisophthalic acid and 9 wt% of polyethylene glycol were copolymerized with polyethylene terephthalate (SSIA-PEG copolymerized PET, melt viscosity: 100 Pa ⁇ s, melting point: 233 ° C.), and polyethylene terephthalate as polymer 2. (PET, melt viscosity: 130 Pa ⁇ s, 254 ° C.) was prepared.
  • SSIA-PEG copolymerized PET melt viscosity: 100 Pa ⁇ s, melting point: 233 ° C.
  • PET melt viscosity: 130 Pa ⁇ s, 254 ° C.
  • the polymer 1 / polymer 2 was weighed to a weight ratio of 30/70 and flowed into the spinning pack incorporating the composite base shown in FIG.
  • a perfectly circular core-sheath composite fiber as shown in 5 (a) is discharged so as to have a composite structure in which the sheath component is completely coated.
  • the inflow polymer was discharged from the pores.
  • the sheath component was polymer 1 and the core component was polymer 2.
  • a core-sheath composite fiber of 56dtex-36 filament is applied to the discharged composite polymer stream after cooling and solidification, wound at a spinning speed of 1500 m / min, and stretched between rollers heated to 90 ° C. and 130 ° C. Manufactured.
  • the ratio of the minimum thickness of the obtained sheath component to the fiber diameter (Smin / D) was 0.03, and the ratio of the maximum thickness to the minimum thickness of the sheath component (Smax / Smin) was 16.
  • the distance from the center of gravity G of the core component to the groove bottom M, the distance between the GM and the center of gravity G of the core component to the tip N of the convex portion, and the ratio of GN (GN / GM) are 1.42, and the core sheath of the present invention. It was confirmed that it was a composite fiber.
  • the ratio of bore diameter R A and circumscribed circle diameter R B of the core-sheath composite fibers was 1.0, since it is likely to be closest packing when present as a multifilament, after elution the sheath component The resulting interfiber voids could be made uniform without unevenness.
  • the woven fabric obtained by weaving the obtained core-sheath composite fiber was treated in a 1 wt% sodium hydroxide aqueous solution (bath ratio 1:50) heated to 90 ° C. to remove 99% or more of the sheath component.
  • a woven fabric composed of multifilaments (fiber diameter 10 ⁇ m) composed of core components of core-sheath composite fibers was obtained.
  • the woven fabric composed of the multifilament has a sheath component that completely covers the core component of the multi-leaf shape, so that the sheath component is less than 5 ⁇ m between each fiber such as natural silk in the multifilament. Since it expresses a void structure in which fine interfiber voids and coarse interfiber voids of 10 ⁇ m or more are uniformly present, it has good gloss (comparative gloss: 1.7) and a feeling of repulsion that does not depend on the viewing angle.
  • the woven fabric when the woven fabric is dyed black, it has excellent color development (black dyeing L value: 14) due to the diffuse reflection of light in the interfiber gaps uniformly existing between the single fibers and the groove at the tip of the convex portion of the irregular cross-sectional fiber. ) was expressed, and it was found that it also had good wear resistance (3-4 grade) without discoloration due to fibrillation in the groove. The results are shown in Table 1-1.
  • Example 2 and 3 All were carried out according to Example 1 except that the weight ratio of polymer 1 / polymer 2 was changed to 20/80 (Example 2) and 10/90 (Example 3).
  • Example 4 Everything was carried out according to Example 1 except that the composite structure of the core-sheath composite fiber was changed to FIG. 2 (a).
  • Example 4 by eliminating the groove at the tip of the convex portion of the fiber in the multifilament, diffused reflection of light is reduced, the reflection intensity is increased, and the visibility of gloss is increased. It was also excellent in wear resistance. The results are shown in Table 1-1.
  • the polymer 1 / polymer 2 was weighed to a weight ratio of 30/70 and flowed into the spinning pack incorporating the composite base shown in FIG.
  • the inflow polymer was discharged from the discharge holes so as to form a perfect circular core-sheath composite fiber as shown in 3 (a) and having a simple composite structure in which the core component having a round cross section was coated with the sheath component.
  • the sheath component was polymer 1 and the core component was polymer 2.
  • a core-sheath composite fiber of 56dtex-36 filament is applied to the discharged composite polymer stream after cooling and solidification, wound at a spinning speed of 1500 m / min, and stretched between rollers heated to 90 ° C. and 130 ° C. Manufactured.
  • the woven fabric obtained by weaving the obtained core-sheath composite fiber was treated in a 1 wt% sodium hydroxide aqueous solution (bath ratio 1:50) heated to 90 ° C. to remove 99% or more of the sheath component.
  • a woven fabric composed of multifilaments (fiber diameter 10 ⁇ m) composed of core components of core-sheath composite fibers was obtained.
  • Comparative Example 2 since it is the core component of the three-leaf cross section, the dry feeling is slightly improved, but after the elution of the sheath component, fine interfiber voids of less than 5 ⁇ m are present between each fiber. It did not, and lacked lightness and repulsion. The results are shown in Table 1-1.
  • the polymer 1 / polymer 2 was weighed to a weight ratio of 5/95 and flowed into the spinning pack incorporating the composite base shown in FIG. As shown in 6 (a), it has a composite structure in which the easily eluted component is arranged in a tapered shape toward the inside of the fiber at the tip of the convex portion of the three-leaf-shaped difficult-to-elut component described in JP-A-57-5912. The inflow polymer was discharged from the discharge hole. At this time, the easy-eluting component was polymer 1 and the difficult-to-eluting component was polymer 2.
  • a 56dtex-36 filament composite fiber is manufactured by applying an oil agent after cooling and solidifying to the discharged composite polymer stream, winding it at a spinning speed of 1500 m / min, and stretching it between rollers heated to 90 ° C. and 130 ° C. did.
  • Example 5 All were carried out according to Example 4 except that the discharge amount was changed so that the fiber diameter of the deformed cross-section fiber composed of only the core component of the core-sheath composite fiber was 14 ⁇ m (Example 5) and 17 ⁇ m (Example 6).
  • Example 7 Everything was carried out according to Example 4 except that the composite structure of the core-sheath composite fiber was changed to FIG. 2 (b).
  • Example 7 since the fiber cross section of the fiber in the multifilament is changed from the trilobal cross section to the four-leaf cross section, the diffused reflection of light at the convex portion is increased, and not only the gloss is closer to a higher quality, but also the luster is approached. A woven fabric with an improved friction and a dry feel was obtained. The results are shown in Table 1-2.
  • the polymer 1 / polymer 2 was weighed to a weight ratio of 20/80 and flowed into the spinning pack incorporating the composite base shown in FIG.
  • the inflow polymer was discharged from the discharge holes so that the easy-eluting component described in Japanese Patent Application Laid-Open No. 2010-222771 had a composite structure in which the difficult-to-eluting component was divided into a plurality of parts as shown in 3 (c).
  • the easy-eluting component was polymer 1 and the difficult-to-eluting component was polymer 2.
  • a 56dtex-18 filament composite fiber is manufactured by applying an oil agent after cooling and solidifying to the discharged composite polymer stream, winding it at a spinning speed of 1500 m / min, and stretching it between rollers heated to 90 ° C. and 130 ° C. did.
  • Comparative Example 4 since the fibers in the multifilament have a fine fiber diameter, they are excellent in gloss and flexibility, but fine interfiber voids of less than 5 ⁇ m and coarseness of 10 ⁇ m or more between each fiber. The interfiber voids were not uniformly present, and lacked lightness and repulsion. In addition, since it has a fine fiber diameter, it is difficult to dye with a dye and lacks color development. The results are shown in Table 1-2.
  • Example 8 As polymer 1, polyethylene terephthalate (SSIA-PEG copolymerized PET, melt viscosity: 100 Pa ⁇ s, melting point: 233 ° C.) in which 8 mol% of 5-sodium sulfoisophthalic acid and 9 wt% of polyethylene glycol are copolymerized, and isophthalic acid as polymer 2 Polyethylene terephthalate (IPA copolymerized PET, melt viscosity: 140 Pa ⁇ s, melting point: 232 ° C.) was prepared, and polyethylene terephthalate (PET, melt viscosity: 130 Pa ⁇ s, melting point: 254 ° C.) was prepared as polymer 3. ..
  • SSIA-PEG copolymerized PET melt viscosity: 100 Pa ⁇ s, melting point: 233 ° C.
  • isophthalic acid as polymer 2
  • Polyethylene terephthalate IPA copolymerized PET, melt viscosity:
  • the polymer 1 / polymer 2 / polymer 3 is weighed to a weight ratio of 30/35/35, and the spinning pack incorporating the composite base shown in FIG. It is an elliptical core-sheath composite fiber as shown in FIG. 5 (b), in which the core component is completely coated with the sheath component, and the core component is divided into two by the sheath component and divided.
  • the inflow polymer was discharged from the discharge holes so that the core component 1 and the core component 2 each had a composite structure having a groove at the tip of the convex portion of the three-leaf cross section.
  • the sheath component was the polymer 1
  • the core component 1 was the polymer 2
  • the core component 2 was the polymer 3.
  • a core-sheath composite fiber of 56dtex-18 filament is applied to the discharged composite polymer stream after cooling and solidification, wound at a spinning speed of 1500 m / min, and stretched between rollers heated to 90 ° C. and 130 ° C. Manufactured.
  • the ratio of the minimum thickness of the obtained sheath component to the fiber diameter (Smin / D) was 0.03, and the ratio of the maximum thickness to the minimum thickness of the sheath component (Smax / Smin) was 12.
  • the distance from the center of gravity G of the core component to the groove bottom M, the distance between the GM and the center of gravity G of the core component to the tip N of the convex portion, and the ratio of GN (GN / GM) are 1.38, and the core sheath of the present invention. It was confirmed that it was a composite fiber.
  • the ratio of bore diameter R A and circumscribed circle diameter R B of the core-sheath composite fibers was 1.8, since it is likely to be closest packing when present as a multifilament, after elution the sheath component The resulting interfiber voids could be made uniform without unevenness.
  • the sheath component completely covering the multi-leaf-shaped core component is eluted, so that the fine fibers of less than 5 ⁇ m are interleaved between each fiber like natural silk.
  • the silk has a void structure in which voids and coarse interfiber voids of 10 ⁇ m or more are uniformly present, and since the core component 1 and the core component 2 have different shrinkage differences, the silk is subjected to heat treatment after elution of the sheath component. A gap structure was exhibited, and the interfiber voids of 10 ⁇ m or more were coarser than those of Example 1, so that the interfiber voids more closely resembled those of natural silk.
  • Example 9 All were carried out according to Example 8 except that the polymer 2 was changed to polypropylene terephthalate (PPT) (Example 9) and polyethylene terephthalate (PET) (Example 10).
  • PPT polypropylene terephthalate
  • PET polyethylene terephthalate
  • Example 9 the woven fabric had a unique stretch function not found in natural silk, as well as exhibiting a more flexible texture in combination with the rubber elasticity characteristics of PPT. Further, since PPT has a low refractive index as compared with PET, the obtained woven fabric is also excellent in color development.
  • Example 10 Although the difference in thread length is not exhibited, the texture of natural silk is sufficiently expressed, and the core component is divided into two, so that the thickness is less than 5 ⁇ m with respect to Example 1. Fine interfiber voids and coarse interfiber voids of 10 ⁇ m or more were present more uniformly, and the texture of the obtained woven fabric was improved in lightness, flexibility, and repulsion. The results are shown in Table 2-1.
  • Example 11 Everything was carried out according to Example 8 except that the composite structure of the core-sheath composite fiber was changed to FIG. 4 (a).
  • Example 11 by eliminating the groove at the tip of the convex portion of the irregular cross-sectional fiber, diffused reflection of light is reduced, the reflection intensity is increased, and the visibility of gloss is increased. It was also excellent in wear resistance. The results are shown in Table 2-1.
  • Example 8 except that the composite structure of the core-sheath composite fiber is shown in FIG. 4A and the weight ratio of the polymer 2 / polymer 3 is changed to 50/20 (Example 12) and 20/50 (Example 13). It was carried out according to.
  • Example 14 The composite structure of the core-in-sheath fiber and FIG. 4 (a), the was performed in accordance with all Example 8 except for changing the modification degree of the (R B / R A) 3.0 .
  • Example 16 since the core component is divided into six by the sheath component, the fiber diameter of the deformed cross-sectional fiber obtained after removing the sheath component becomes smaller, resulting in a milder and more luxurious luster. Not only that, but also a woven fabric with a texture excellent in flexibility could be obtained. The results are shown in Table 2-2.
  • the polymer 1 / polymer 2 / polymer 3 is weighed to a weight ratio of 5 / 42.5 / 42.5, and the composite base shown in FIG. 12 is incorporated.
  • the easily eluted component is tapered toward the inside of the fiber at the tip of the convex portion of the three-leaf-shaped difficult-to-elut component described in JP-A No. 2-145825 as shown in FIG. 6 (b).
  • the inflow polymer was discharged from the discharge hole so that the composite structure was arranged in a shape and the difficult-to-elute component consisted of two types of polymers, a high shrinkage component and a low shrinkage component.
  • the easy-eluting component was polymer 1
  • the low-elution component was polymer 2
  • the low-elution component was polymer 3.
  • the fibers After cooling and solidifying the discharged composite polymer stream, an oil agent is applied, the fibers are wound at a spinning speed of 1500 m / min, and the fibers are stretched between rollers heated to 90 ° C. and 130 ° C. to achieve 56 dtex-36 filaments (high shrinkage: 28 dtex). -18 filaments, low shrinkage: 28 dtex-18 filaments) composite fibers were produced.
  • the woven fabric obtained by weaving the obtained composite fiber is treated in a 1 wt% sodium hydroxide aqueous solution (bath ratio 1:50) heated to 90 ° C. to remove 99% or more of the sheath component, and then 130 ° C.
  • a woven fabric composed of a multifilament (fiber diameter 12 ⁇ m) composed of a difficult-to-elute component of the composite fiber was obtained.
  • Example 17 Polyethylene terephthalate (SSIA-PEG copolymerized PET, melt viscosity: 100 Pa ⁇ s, melting point: 233 ° C.) in which 8 mol% of 5-sodium sulfoisophthalic acid and 9 wt% of polyethylene glycol are copolymerized as polymer 1 and isophthalic acid as polymer 2.
  • SSIA-PEG copolymerized PET melt viscosity: 100 Pa ⁇ s, melting point: 233 ° C.
  • a 7 mol% copolymerized polyethylene terephthalate (IPA copolymerized PET, melt viscosity: 140 Pa ⁇ s, melting point: 232 ° C.) was prepared, and a polyethylene terephthalate (PET, melt viscosity: 130 Pa ⁇ s, melting point: 254 ° C.) was prepared as the polymer 3.
  • IPA copolymerized PET melt viscosity: 140 Pa ⁇ s, melting point: 232 ° C.
  • PET melt viscosity: 130 Pa ⁇ s, melting point: 254 ° C.
  • the polymer 1 / polymer 2 / polymer 3 is weighed to a weight ratio of 30/35/35, and the spinning pack incorporating the composite base shown in FIG. It is a core-sheath composite fiber as shown in FIG. 10 (b), in which the core component is completely coated with the sheath component, and the core component is divided into two by the sheath component, and the divided core is divided.
  • the inflow polymer was discharged from the discharge holes so that the component 1 and the core component 2 each had a composite structure having a groove at the tip of the convex portion of the three-leaf cross section.
  • the sheath component was the polymer 1
  • the core component 1 was the polymer 2
  • the core component 2 was the polymer 3.
  • a core-sheath composite fiber of 56dtex-18 filament is applied to the discharged composite polymer stream after cooling and solidification, wound at a spinning speed of 1500 m / min, and stretched between rollers heated to 90 ° C. and 130 ° C. Manufactured.
  • the ratio of the minimum thickness of the obtained sheath component to the fiber diameter (Smin / D) was 0.03, and the ratio of the maximum thickness to the minimum thickness of the sheath component (Smax / Smin) was 12.
  • the distance from the center of gravity G of the core component to the groove bottom M, the distance between the GM and the center of gravity G of the core component to the tip N of the convex portion, and the ratio of GN (GN / GM) are 1.38. It was confirmed that it was a composite fiber.
  • the ratio of bore diameter R A and circumscribed circle diameter R B of the core-sheath composite fibers was 1.8, since it is likely to be closest packing when present as a multifilament, after elution the sheath component The resulting interfiber voids could be made uniform without unevenness.
  • the obtained core-sheath composite fiber woven fabric is heat-treated at 130 ° C. and then treated in a 1 wt% sodium hydroxide aqueous solution (bath ratio 1:50) heated to 90 ° C.
  • a woven fabric made of a multifilament in which crimping fibers composed of different polymers were uniformly mixed was obtained.
  • the obtained crimpable fiber has a composite structure (atypia: 1.6) having a groove (MN / D: 0.13) at the tip of the convex portion of the three-leaf cross section, and the fiber diameter is 10 ⁇ m.
  • the number of crimped ridges was 14 ridges / cm, and the difference in yarn length of the crimped fibers composed of polymers having different melting points was 7%.
  • the woven fabric made of the multifilament has a coarseness of 10 ⁇ m or more between each fiber due to the exclusion volume effect between the fibers due to the development of the crimped morphology by the wet heat treatment due to the difference in heat shrinkage of the polymers having different melting points.
  • interfiber voids formed, but interfiber voids of less than 5 ⁇ m are formed between adjacent crimped fibers made of polymers having different melting points, and fine fibers of less than 5 ⁇ m are formed in the multifilament. It had a void structure very similar to the interfiber voids of natural silk, in which fine interfiber voids and coarse interfiber voids of 10 ⁇ m or more were more uniformly mixed.
  • the average interfiber void distance 10.5 ⁇ m
  • the ratio of the interfiber void distance less than 5 ⁇ m 25%
  • porosity 65%.
  • the woven fabric has a high-quality luster (contrast luster: 1.4) that does not depend on the viewing angle and is very light (apparent density: 0.32 g / cm 3 ) and has a dry feeling (coefficient of friction: 0.8). ), And by forming a gap distance between fibers of less than 5 ⁇ m more stably than in Example 8, a feeling of repulsion (bending recovery 2 HB: 0.7 ⁇ 10 -2 gf ⁇ cm / cm) and It had better flexibility (bending hardness B: 0.8 ⁇ 10 -2 gf ⁇ cm 2 / cm) and had a texture similar to that of natural silk.
  • Example 18 All were carried out according to Example 17 except that the weight ratio of Polymer 1 / Polymer 2 / Polymer 3 was changed to 20/40/40 (Example 18) and 10/45/45 (Example 19).
  • Example 20 Everything was carried out according to Example 17 except that the polymer 2 was changed to polypropylene terephthalate (PPT, melt viscosity: 150 Pa ⁇ s, melting point: 233 ° C.).
  • PPT polypropylene terephthalate
  • Example 20 in combination with the rubber elasticity characteristics of PPT, it was a woven fabric that not only exhibited a more flexible texture but also had a peculiar stretch function not found in natural silk. Further, since PPT has a low refractive index as compared with PET, the obtained woven fabric is also excellent in color development. The results are shown in Table 3.
  • Example 21 Everything was carried out according to Example 17 except that the polymer 2 was changed to polyethylene terephthalate (high viscosity PET, melt viscosity: 250 Pa ⁇ s, melting point: 254 ° C.) having a high melt viscosity.
  • polyethylene terephthalate high viscosity PET, melt viscosity: 250 Pa ⁇ s, melting point: 254 ° C.
  • Example 5 by expressing the crimp not by the difference in viscosity between the polymer 3 and the difference in viscosity but by the difference in viscosity, the number of crimped ridges of the crimpable fibers constituting the multifilament is also reduced. Diffuse reflection of light due to the void structure was suppressed, and the visibility of gloss was increased. Further, since the expression of the crimped morphology in the moist heat treatment is reduced, the ratio of the gap distance between fibers of less than 5 ⁇ m is increased, and the repulsive feeling is also excellent. The results are shown in Table 3.
  • a 7 mol% copolymerized polyethylene terephthalate (IPA copolymerized PET, melt viscosity: 140 Pa ⁇ s, melting point: 232 ° C.) was prepared, and a polyethylene terephthalate (PET, melt viscosity: 130 Pa ⁇ s, melting point: 254 ° C.) was prepared as the polymer 3.
  • IPA copolymerized PET melt viscosity: 140 Pa ⁇ s, melting point: 232 ° C.
  • PET melt viscosity: 130 Pa ⁇ s, melting point: 254 ° C.
  • the polymer 1 / polymer 2 is weighed to a weight ratio of 2.5 / 47.5 and the polymer 1 / polymer 3 to a weight ratio of 2.5 / 47.5. Then, it is poured into a spinning pack incorporating the composite base shown in FIG. 12, and is formed on the tip of a convex portion of a three-leaf-shaped difficult-to-dissolve component described in JP-A No. 2-145825 as shown in FIG.
  • the inflow polymer was discharged so as to be discharged from the discharge hole.
  • the easily eluted component was polymer 1
  • the high shrinkage component was polymer 2
  • the low shrinkage component was polymer 3.
  • the fibers After cooling and solidifying the discharged composite polymer stream, an oil agent is applied, the fibers are wound at a spinning speed of 1500 m / min, and the fibers are stretched between rollers heated to 90 ° C. and 130 ° C. to achieve 56 dtex-36 filaments (high shrinkage: 28 dtex). -18 filaments, low shrinkage: 28 dtex-18 filaments) composite fibers were produced.
  • the obtained composite fiber woven fabric is heat-treated at 130 ° C. and then treated in a 1 wt% sodium hydroxide aqueous solution (bath ratio 1:50) heated to 90 ° C. 99% or more of the sheath component was removed to obtain a woven fabric composed of a multifilament (fiber diameter 12 ⁇ m) composed of a difficult-to-dissolve component of the composite fiber.
  • Example 22 Everything was carried out according to Example 17 except that the composite structure of the core-sheath composite fiber was changed to FIG. 10 (a).
  • Example 22 by eliminating the groove at the tip of the convex portion of the crimped fiber in the multifilament, diffused reflection of light is reduced, the reflection intensity is increased, and the visibility of gloss is increased. It was also excellent in wear resistance. The results are shown in Table 4.
  • Example 23 and 24 All were carried out according to Example 17 except that the weight ratio of the polymer 2 / polymer 3 was changed to 50/20 (Example 23) and 20/50 (Example 24).
  • Examples 23 and 24 as the ratio of the polymer 2 which is a high shrinkage component is increased, the number of crimped ridges and the difference in yarn length of the crimped fibers in the multifilament are more expressed, and the voids contained in the multifilament The average interfiber gap distance in the structure is increased, the lightness of the obtained woven fabric is increased, and the more the polymer 3 which is a low shrinkage component is, the smaller the number of crimped fibers in the multifilament is.
  • Example 25 and 26 All were carried out according to Example 17 except that the discharge amount was changed so that the fiber diameter of the crimpable fiber in the multifilament was 14 ⁇ m (Example 25) and 17 ⁇ m (Example 26).
  • the multifilament of the present invention two or more types of crimpable fibers composed of different polymers are uniformly mixed in the multifilament, so that each fiber like natural silk is uniformly mixed in the multifilament. It is possible to form a peculiar void structure in which fine interfiber voids of less than 5 ⁇ m and coarse interfiber voids of 10 ⁇ m or more are uniformly mixed between them. Therefore, the multifilament textile product of the present invention can reproduce various textures peculiar to natural silk, and it can be used not only for Western clothing and Japanese clothing, which have been mainly used for natural silk, but also for handling unique to synthetic fibers.
  • a Fibroin consisting of a difficult-to-elute component in raw silk of natural silk
  • Sericin consisting of an easily-eluting component in raw silk of natural silk
  • Difficult-to-eluting component d Easy-eluting component
  • A A perfect circle inscribed at two or more points on the cross section of a composite fiber (inscribed circle)
  • B A perfect circle (circumscribed circle) that circumscribes the cross section of the composite fiber at two or more points.

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WO2025105062A1 (ja) * 2023-11-17 2025-05-22 東レ株式会社 短繊維および紡績糸

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