JP2006233388A - Curtain - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a curtain having excellent lightness and an excellent shading property. <P>SOLUTION: This curtain is characterized by at least partially using modified cross-section blend fibers which comprise a fiber-formable polymer A and a polymer B incompatible with the polymer A, have discontinuous spaces in the fiber axial direction, and have fiber cross sections having a modification degree of ≥1.20. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a curtain. More specifically, the present invention relates to a curtain that does not rely on light absorbers or light reflectors such as pigments and titanium oxide, has an excellent light shielding performance that has never existed before, and has excellent lightness.

  Conventionally, as a curtain fabric utilizing light-shielding properties, in addition to a method of using a thick fabric, for example, (1) a fabric having a design with a chromatic color on one side and an achromatic color such as black on the other side Reversible knitted or knitted, (2) A laminated film of a metal such as aluminum or a metal powder added with a cloth, (3) A laminated film and a cloth, (4) Known are ones in which a colored resin is coated on one side (or both sides) of the fabric, or those in which the film of (2) or (3) is laminated (see Patent Document 1 or 2). However, in any of these methods, the curtain weight is likely to increase, and it is necessary to equip a curtain rail with high strength that can withstand the weight. It was inferior in terms of the stability of the manufacturing process, the quality of the obtained curtain, and the equipment used for the curtain being limited, such as the drapability being deteriorated or the adhesion of the coating layer being likely to fail.

  Therefore, a technique for improving the light shielding property and improving the drape property by adding inorganic particles such as titanium oxide, silicon dioxide, vanadium pentoxide, and zinc oxide to the fiber itself is disclosed (see Patent Document 3 or 4). ). In this technology, it is possible to appropriately select the particles to be added and the amount of addition depending on the type of light rays to be shielded, such as ultraviolet rays and infrared rays, and the amount of light rays to be shielded. It ’s definitely an excellent way to increase it. However, as the amount of these inorganic particles added is increased in order to improve the light-shielding property, the original physical properties of the fiber are lowered, that is, the breaking strength and the residual elongation are easily lowered, and the fiber resin itself is deteriorated by the added particles. In addition, the specific gravity of the fiber itself increases and the curtain ground itself becomes heavy, and as a result, the configuration of the fiber material or the fiber structure in which the fiber is used is naturally limited.

  Therefore, as a fiber that can be used in a curtain fabric, a technique for forming a hollow fiber in which a hollow portion is provided in a fiber containing inorganic fine particles is disclosed in order to improve the specific gravity of these fibers (see Patent Document 5 or 6). In this technique, the apparent specific gravity is reduced by forming the hollow portion, and although it is possible to achieve a fiber material that is excellent in lightness, it is necessary to provide a relative light shielding property by necessarily forming the hollow portion. The content of inorganic fine particles is reduced and the light shielding property tends to be inferior, and the number of hollow portions formed in the cross section of the fiber perpendicular to the fiber axis is small, and the light shielding effect that can be exhibited by irregular reflection etc. It is not so high, and furthermore, since the shape of the hollow portion in the above fiber cross section is large, there is a concern about the collapse of the hollow portion, and as a result, it is difficult to maintain both high light shielding properties and light weight with this technology. Met.

In order to impart lightness to the fiber, the present inventors already have a sea-island polyester composite fiber composed of polyester and a thermoplastic polymer (excluding polyester) having no maleimide structure, and at least part of the sea-island composite interface has voids. The polyester composite fiber which is excellent in the lightweight property whose fiber has an apparent specific gravity of 1.2 or less is proposed (see Patent Document 7). This technology has many fine voids inside the fiber and exhibits innumerable irregular reflection to achieve both excellent light-shielding properties and light weight. Also, since the voids are fine, the fiber properties are also excellent. A lightweight fiber suitable for applications and industrial applications can be obtained. However, with a simple fiber cross-sectional shape, the irregular reflection of the voids inside the fiber is isotropic and cannot be fully utilized, and the improvement of the light shielding property cannot be expected so much.
JP-A-3-2867160 (Claims) Japanese Patent Laid-Open No. 9-252931 (Claims) JP 5-9836 A (claim, paragraph [0002]) JP-A-5-148734 (Claims) JP-A-4-257308 (Claims) JP-A-8-60486 (Claims) JP 2004-183196 A (Claims)

  An object of the present invention is to solve the above-mentioned problems of the prior art and provide a curtain having both excellent lightness and light shielding properties.

  The present invention relates to a curtain that achieves both excellent light weight and light shielding properties, and has been intensively studied.In that, the curtain using a fiber having a specific fiber structure can eliminate the disadvantages of the prior art. And it has been found that further merits can be imparted, and the present invention has been achieved.

The present invention adopts the following configuration in order to solve the above problems. That is,
(1) A blended fiber containing a polymer A having fiber-forming ability and a polymer B incompatible with the polymer A, having discontinuous voids in the fiber axis direction, and fibers A curtain comprising at least a part of a modified cross-section fiber having a profile of 1.20 or more in cross section.

  (2) In the fiber cross section perpendicular to the fiber axis direction of the irregularly shaped fiber, the average diameter d1 of the voids included between the circumscribed circle and the inscribed circle, and the voids included inside the inscribed circle The curtain according to (1), wherein the average diameter d2 satisfies d2 / d1 ≧ 1.30.

  (3) In the fiber cross section perpendicular to the fiber axis direction of the irregularly shaped fiber, the number of voids discontinuous in the fiber axis direction having an average diameter of 0.1 μm or more is 300 to 100,000. The curtain according to (1) or (2).

  (4) The average diameter of the voids that are discontinuous in the fiber axis direction in the fiber cross section perpendicular to the fiber axis direction of the irregular cross-section fiber is 0.10 to 1.50 μm, The curtain according to any one of (3).

  (5) The curtain according to any one of (1) to (4), wherein an apparent specific gravity of the irregularly shaped cross-section fiber is 1.20 or less.

  (6) The curtain according to any one of (1) to (5), wherein an average transmittance of visible light having a wavelength of 360 to 740 nm is 20% or less.

  (7) The said polymer A consists of at least 1 sort (s) chosen from a polyester-type polymer, a polyamide-type polymer, and a polyolefin-type polymer, Any one of said (1)-(6) characterized by the above-mentioned. curtain.

  (8) The curtain according to any one of (1) to (7), wherein the content of the polymer B in the irregularly shaped cross-section fiber is 1% by weight or more and 30% by weight or less.

(9) The curtain according to any one of (1) to (8), wherein a chromaticity b ^* value of the modified cross-section fiber is 5 or less.

  The curtain according to the present invention is not inferior to conventional curtains using fibers of different materials and fibers containing inorganic particles. is there. In particular, since the fiber itself used in the curtain has a very high light-shielding property, it is not necessary to apply a coating or the like, and it is very preferable because it satisfies the properties originally required by the curtain such as drape. The curtain of the present invention is very excellent in terms of lightness that cannot be achieved with the conventional curtain, and the specific gravity of the fibers used is small, so the conventional curtain and the curtain of the present invention were compared with the same mass. In some cases, the curtain of the present invention is more excellent in light shielding properties. Conversely, if the conventional curtain and the curtain of the present invention have the same level of light-shielding properties, the curtain of the present invention is very lightweight, so a sturdy curtain rail or the like is no longer required for curtain installation. It is not necessary and is very versatile regardless of the place where it is used.

  The curtain of the present invention is not particularly limited in the form in which it can be used, as long as it can exhibit both lightness and light shielding properties. For example, as a form thereof, a drape curtain, a blind curtain, Examples include accordion curtains, roll curtains, lace curtains, and casement curtains. These are used in various places in buildings such as residences, stores, and offices, or for in-vehicle use, which block the light of introduction or people's eyes, or spaces. In addition to being used as a part of a partition, it is preferably used for a notebook used in a black curtain or a theater, a warmer hanging at the entrance of a store, and the like. Of these, drape curtains naturally have superior light-shielding properties and lighter weight. In addition, blind curtains, accordion curtains, roll curtains, lace curtains, casement curtains, etc. have not only lightness related to handling but also excellent light shielding properties that have not existed before. .

  Moreover, it is preferable that the average transmittance | permeability of visible light with a wavelength of 360 nm-740 nm is 20% or less from the point that the curtain of this invention is excellent in light-shielding property. The method for measuring the average transmittance is described later in M.S. It is measured by the method. The average transmittance is preferably 15% or less, more preferably 10% or less, and particularly preferably 5% or less because the lower the average transmittance, the higher the light shielding property. Of course, in the case of a light shielding curtain, it is of course most preferable that no light is transmitted. When the highest light shielding property is exhibited, the average transmittance is 0%.

  The fibers used in the curtain of the present invention preferably have an elongated shape and a ratio of the length to the apparent diameter of at least 20, for example, made in the production of conventional synthetic fibers. Although long fibers (filaments), short fibers (staples), or cut fibers cut into a length of 30 mm or less are not particularly limited as long as they are fibrous, long fibers are more preferably used.

  Further, the diameter of the fiber is not particularly limited, but is excellent in fiber physical properties, or exhibits a desired light shielding property when forming a curtain, and further improves the workability when forming the curtain. Therefore, the fiber diameter is preferably 1000 μm or less, more preferably 200 μm or less, and further preferably 50 μm or less. In addition, the lower limit of the fiber diameter is preferable because the drapeability when the curtain is formed is expressed as it is thinner, but is preferably 0.01 μm or more in terms of maintaining stable curtain quality, and is 0.10 μm or more. More preferably.

  The fiber used for at least a part of the curtain of the present invention has an irregular cross-sectional shape having an irregularity of 1.20 or more in the fiber cross section. The method for calculating the degree of irregularity will be described later. Here, the fiber cross section is a section perpendicular to the fiber axis direction, and the optical reflection by the irregular section and the inside of the fiber are not performed until the degree of irregularity is 1.20 or more. Innumerable light reflection (irregular reflection) due to a large number of voids acts synergistically, and high light-shielding properties that are difficult to achieve with conventional fibers are developed. In addition, as a secondary function, the irregular cross-section effectively expresses a gap between single fibers and contributes to an improvement in lightness when a curtain is formed. However, when the degree of irregularity is less than 1.20, the light shielding performance depends only on the irregular reflection inside the fiber, and a higher light shielding property cannot be expected as compared with the case where the degree of irregularity is 1.20 or more. Lightweight due to is hardly expressed. The greater the degree of irregularity, the greater the light shielding effect due to the synergistic effect. As a result, the degree of irregularity is preferably 1.30 or more, more preferably 1.40 or more, and 1.50. The above is particularly preferable. The upper limit is not particularly limited, but is preferably 7.0 or less, more preferably 5.0 or less, and more preferably 3.0 or less in that the shape stability of the curtain is improved. Even more preferred is 2.0 or less.

  The aforesaid irregularity is defined as the ratio (D1 / D2) of the diameter D1 of the circumscribed circle and the diameter D2 of the inscribed circle in the single fiber cross section. The irregular cross-section may be a shape that maintains symmetry such as line symmetry or point symmetry, or may be asymmetric, but it is generally symmetrical in terms of having uniform fiber properties. Is preferred. When it is judged that the irregular cross section generally retains line symmetry and point symmetry, the inscribed circle is a circle inscribed in the curved line that forms the profile of the irregular cross section fiber in the single fiber cross section, and the circumscribed circle is a single fiber. It is a circle that circumscribes a curve that defines the profile of the irregular cross-section fiber in the cross section. For example, the degree of irregularity of the three-leaf shaped irregular cross-section fiber shown in FIG. 1 is calculated using the diameter D1 of the circumscribed circle 1 and the diameter D2 of the inscribed circle 2. In addition, when it is determined that the irregular cross section has a shape that does not retain line symmetry or point symmetry at all, it is inscribed at least at two points with the curve that forms the profile of the irregular cross section fiber, and exists only inside the fiber. A circle having the maximum radius that can be taken in a range in which the circumference of the inscribed circle does not intersect with the curved line forming the profile of the irregular cross-section fiber is defined as the inscribed circle. The circumscribed circle circumscribes at least two points in the curve showing the profile of the irregular cross-section fiber, exists only outside the cross-section of the single fiber, and is the smallest possible in the range where the circumference of the circumscribed circle and the profile of the irregular cross-section fiber do not intersect A circle having a radius is defined as a circumscribed circle. Note that hollow fibers having a single or plural hollow portions that are continuously present in the longitudinal direction of the fiber and do not communicate with the outside of the fiber at all are not included in the modified cross-section fiber intended in the present invention. .

  The shape of the single-fiber cross section of the irregular cross-section fiber used in the present invention is not particularly limited, and can take a wide variety of cross-sectional shapes. For example, shapes such as a polygonal shape, a gear shape, a petal shape, a multileaf shape, a star shape, a C shape, a well shape, a − shape, a + shape, and the like can be given as general names. In terms of more excellent light-shielding properties, a multi-leaf type, a polygon type, a gear type, and a star shape are preferable, a well-type, a -type, a + type, and a multi-leaf type are more preferable, and a multi-leaf type is preferable. Particularly preferred. A multi-leaf type cross-section refers to one having irregularities in the cross-section and the same number of concave and convex portions, and a multi-leaf type cross-section fiber in which a multi-leaf type cross-section is continuously formed in the longitudinal direction is a fiber Light reflected from the surface again enters the inside of the fiber and easily exhibits high light-shielding performance due to a synergistic effect with a large number of voids inside the fiber, and it is easy to form voids between single fibers, making the curtain itself lightweight. It is preferable because it is easy to apply. In addition to being easy to maintain a high-quality texture such as a dry touch, a feeling of creaking, a feeling of swell, and a feeling of swelling as a material, it is preferable because it can also have added-value characteristics such as bulkiness and heat retention.

  When the cross-sectional shape of the irregularly-shaped cross-section fiber in the present invention is a multileaf type, the upper limit and lower limit of the number of leaves are not particularly limited, but it is more excellent in silky luster and has a small contact area with the skin. It is preferably 3 or more leaves in that it has a dry touch texture and is light in weight. On the other hand, in consideration of the spinnability and the fiber properties of the resulting fiber, or the fact that the cross-sectional shape is easy to maintain, it is preferably a multi-leaf type irregular section of 8 or less leaves, Even more preferably.

  In addition, in the-type, in addition to the above-described irregularity, it is important that the ratio L / d of the width (d) and the length (L) of the cross section as shown in FIG. However, L / d is preferably as large as possible, and can generally be 10 or less. In the case of the above-shaped irregular cross-section fibers, the fibers tend to overlap in contact with the fibers when forming the curtain, and the gap between the single fibers does not appear so much, but a strong anisotropy occurs in the light-shielding performance. As a result, a curtain having high light shielding properties is preferable.

  Furthermore, in the well type or the + type, the light shielding property having high anisotropy derived from the cross-sectional structure of the fiber is exhibited, and the void between the single fibers is also efficiently expressed. The curtain of the present invention used for a part is very excellent in light shielding and light weight.

  The fiber used for the curtain of the present invention is composed mainly of the polymer A having fiber forming ability. The polymer A having fiber-forming ability can be exemplified by a wide variety, but more preferably, for example, a monomer having a vinyl group is a radical polymerization, anionic polymerization, or cationic polymerization. Polyolefin polymers and other vinyl polymers synthesized by the mechanism of polymer formation by addition polymerization reaction such as polyethylene, polypropylene, polybutylene, polymethylpentene, polystyrene, polyacrylic acid, polymethacrylic acid, polymethacrylic acid Examples include methyl, polyacrylonitrile, polytetrafluoroethylene, polyvinylidene fluoride, polyvinylidene chloride, and polycyanide vinylidene. These are polymers made by homopolymerization such as polyethylene only or polypropylene only. Alternatively, it may be a copolymer polymer formed by carrying out a polymerization reaction in the presence of a plurality of monomers. For example, poly (styrene-methacrylate) when polymerized in the presence of styrene and methyl methacrylate. Such a copolymer may be used as long as the gist of the invention is not impaired. Among these polyolefin-based polymers, polyethylene, polypropylene, polybutylene, and polymethylpentene are more preferable as those that can impart preferable lightness to the curtain.

  As the polymer A having fiber forming ability, for example, a polyamide polymer formed by a reaction of carboxylic acid or carboxylic acid chloride and an amine can be mentioned as a preferable one. Specifically, nylon 6 and nylon 7 can be mentioned. Nylon 9, Nylon 11, Nylon 12, Nylon 6,6, Nylon 4,6, Nylon 6,9, Nylon 6,12, Nylon 5,7, Nylon 5,6 and the like, and the gist of the present invention Other aromatic, aliphatic, and alicyclic dicarboxylic acids and aromatic, aliphatic, and alicyclic diamine components, or one compound such as aromatic, aliphatic, and alicyclic, and carboxylic acid, as long as they are not damaged A polyamide in which an aminocarboxylic acid compound having both amino groups may be used alone, or the third and fourth copolymerization components are copolymerized A polymer may be. Of these polyamide-based polymers, nylon 6 or nylon 6, 6 is more preferable because it can impart superior lightness and light shielding properties when used in curtains.

  Examples of the polymer A having fiber-forming ability include a polyester polymer formed by an esterification reaction of a carboxylic acid and an alcohol. A polyester polymer is preferable as the polymer A used in the present invention because it is excellent in various functions as a resin in a well-balanced manner. Specifically, examples of the polyester-based polymer used in the present invention include a polymer formed from an ester bond of a dicarboxylic acid compound and a diol compound. Examples of such a polymer include polyethylene terephthalate and polypropylene terephthalate. (Also referred to as polytrimethylene terephthalate), polybutylene terephthalate (also referred to as polytetramethylene terephthalate), polyethylene naphthalate and polycyclohexanedimethanol terephthalate, or a liquid crystalline polyester having molten liquid crystallinity mainly composed of an aromatic hydroxycarboxylic acid, etc. Is mentioned.

  The polyester polymer used as the polymer A and formed from an ester bond of a dicarboxylic acid compound and a diol compound may be copolymerized with other components within a range not impairing the gist of the present invention. As a polymerization component, for example, as a dicarboxylic acid compound, for example, terephthalic acid, isophthalic acid, naphthalene dicarboxylic acid, diphenyl dicarboxylic acid, anthracene dicarboxylic acid, phenanthrene dicarboxylic acid, diphenyl ether dicarboxylic acid, diphenoxyethane dicarboxylic acid, diphenylethane dicarboxylic acid Adipic acid, sebacic acid, 1,4-cyclohexanedicarboxylic acid, 5-sodium sulfoisophthalic acid, 5-tetrabutylphosphonium isophthalic acid, azelaic acid, dodecanedioic acid, hexahydroterephthalic acid, And aromatic, aliphatic, alicyclic dicarboxylic acids and their alkyl, alkoxy, allyl, aryl, amino, imino, halide and other derivatives, adducts, structural isomers, and optical isomers. Among these dicarboxylic acid compounds, one kind may be used alone, or two or more kinds may be used in combination as long as the gist of the invention is not impaired.

  Examples of the copolymer component include diol compounds such as ethylene glycol, propylene glycol, butylene glycol, pentanediol, hexanediol, 1,4-cyclohexanedimethanol, neopentyl glycol, hydroquinone, resorcin, dihydroxybiphenyl, naphthalenediol, anthracene. Aromatic, aliphatic and alicyclic diol compounds such as diol, phenanthrenediol, 2,2-bis (4-hydroxyphenyl) propane, 4,4′-dihydroxydiphenyl ether, bisphenol S, and their alkyl, alkoxy, allyl, Derivatives, adducts, structural isomers, and optical isomers such as aryl, amino, imino, and halide can be listed. One of these diol compounds can be used alone. Also it may be, or in a range that does not impair the gist of the invention may be used in combination of two or more.

  Examples of the copolymer component include a compound having a hydroxyl group and a carboxylic acid in one compound, that is, a hydroxycarboxylic acid. Examples of the hydroxycarboxylic acid include lactic acid, 3-hydroxypropionate, and 3-hydroxybutyrate. Aromatic, aliphatic and alicyclic diol compounds such as acrylate, 3-hydroxybutyrate valerate, hydroxybenzoic acid, hydroxynaphthoic acid, hydroxyanthracenecarboxylic acid, hydroxyphenanthrenecarboxylic acid, (hydroxyphenyl) vinylcarboxylic acid, and their Derivatives, adducts, structural isomers and optical isomers such as alkyl, alkoxy, allyl, aryl, amino, imino, and halide can be mentioned, and one of these hydroxycarboxylic acids may be used alone. Or invention It may be used in combination of two or more in a range that does not impair the gist.

  Further, the copolymer component may be a polyfunctional molecule having three or more ester-forming functional groups in one molecule in one compound. Examples of the ester-forming functional group include a hydroxyl group, a carboxyl group, Any functional group of an ester bond formed by condensation of a hydroxyl group and a carboxyl group may be used. Examples of the polyfunctional molecule include pentaerythritol, pyromellitic acid, trimethylolpropane, trimellitic acid, and dimethylol. Propionic acid, dipentaerythritol, glycerol, sorbitol, trimethylolethane, trimethylolbutane, 1,3,5-trimethylolbenzene, 1,2,6-hexanetriol, 2,2,6,6-tetramethylolcyclohexanol , Hemimetic acid, trimesic acid, prenitic acid, merophanic acid 5-hydroxyisophthalic acid, 2,5-dihydroxyisophthalic acid, 2,5-dihydroxyterephthalic acid, and the like, and ester compounds thereof, such as alkyl, alkoxy, allyl, aryl, amino, imino, halide, etc. Derivatives, adducts, structural isomers, and optical isomers may be used, and one of these polyfunctional molecules may be used alone, or two or more of them may be combined in a range that does not impair the gist of the invention. May be used. When these polyfunctional molecules are copolymerized, it is preferable because the voids are more densely formed or smaller.

  In addition, as the above-described polyester polymer, a polymer having a main repeating unit of a hydroxycarboxylic acid compound having both a carboxylic acid and a hydroxyl group as one compound such as aromatic, aliphatic, and alicyclic may be used. Although not particularly limited, for example, the polymers according to these include polylactic acid, poly (3-hydroxypropionate), poly (3-hydroxybutyrate), and poly (3-hydroxybutyrate valerate). In addition, poly (hydroxycarboxylic acid) such as, may be aromatic, aliphatic, alicyclic dicarboxylic acid, or a poly (hydroxycarboxylic acid) as long as the gist of the present invention is not impaired. Aromatic, aliphatic, alicyclic diol components may be used, or multiple types of hydroxycarboxylic acids are copolymerized It may be.

  Of these polyester polymers that are preferred, polyesters whose main repeating unit is ethylene terephthalate, propylene terephthalate, butylene terephthalate, or lactic acid are more preferred, and polyesters whose main repeating unit is ethylene terephthalate are particularly lightweight. Easy and most preferred.

  In addition, the polymer A having fiber-forming ability used in the present invention is formed by cyclization polycondensation of a polycarbonate polymer formed by transesterification of an alcohol and a carbonic acid derivative, a carboxylic acid anhydride and a diamine. Polyimide polymers, polybenzimidazole polymers formed by the reaction of dicarboxylic acid esters and diamines, polysulfone polymers, polyether polymers, polyphenylene sulfide polymers, polyether ether ketone polymers, polyether ketone ketones In addition to polymers such as polymers and aliphatic polyketones, cellulose polymers and polymers derived from natural polymers such as chitin, chitosan and derivatives thereof are also included.

  As the polymer A in the present invention, a polymer having a viscosity used for a synthetic fiber can be used. Although not particularly limited, for example, if the polyester polymer is polyethylene terephthalate, the intrinsic viscosity (IV) is preferably 0.4 to 1.5, and preferably 0.5 to 1.3. It is more preferable. Moreover, if it is a polypropylene terephthalate, it is preferable that it is IV0.7-2.0, and it is more preferable that it is 0.8-1.8. Or if it is polybutylene terephthalate, it is preferable that it is IV0.6-1.5, and it is more preferable that it is 0.7-1.4. For example, if the polyamide polymer is nylon 6, the sulfuric acid relative viscosity ηr is preferably 1.9 to 3.0, and more preferably 2.1 to 2.8. Polyesters used in the present invention are poly (hydroxycarboxylic acids) represented by polylactic acid that are not evaluated by IV, and these are in the weight average molecular weight (hereinafter sometimes simply referred to as average molecular weight). For example, polylactic acid having an average molecular weight of 50,000 to 500,000 is usually used, preferably 100,000 to 300,000, and 150,000 to 250,000 in view of processability and spinnability. Polylactic acid having an average molecular weight of 2 is more preferably used.

In addition, the melt viscosity of the polymer A used in the present invention is not particularly limited, and the shear viscosity at a shear rate of 10 sec ⁻¹ is ¹ to 10,000 [Pa · sec] at the temperature used for melt spinning. These polymers are usually used, and preferably 10 to 5000 [Pa · sec].

  Since the content of the polymer A in the fiber used in the curtain of the present invention is a main component, it is preferably 50% by weight or more. In particular, since it is preferable that strength is high in fiber properties, the content of polymer A in the fiber is preferably as high as possible, preferably 70% by weight or more, more preferably 80% by weight or more, and still more preferably 85%. % By weight or more. Moreover, since it contains the polymer B, 99 weight% or less is preferable.

  The fiber used at least in part in the curtain of the present invention is a blended fiber composed of the polymer A and the polymer B incompatible with the polymer A. Specifically, since the polymer B is incompatible with the polymer A, the polymer B exists in an island shape in a single fiber cross section perpendicular to the fiber axis. In the present invention, “incompatible” means that the average dispersion of islands formed by the polymer B in the polymer A is not compatible with the polymer A and the polymer B in the molecular chain size order of the polymer. The diameter is preferably at least 10 nm (see the measurement method in Example D.). When the polymer A and the polymer B are compatible, that is, when the average dispersion diameter of the island-like polymer B is smaller than 10 nm, the obtained fiber has discontinuous voids (hereinafter referred to as fiber axis) in the fiber axis direction. A gap that is discontinuous in the direction is sometimes simply abbreviated as “void”), or a gap that is necessary to become a lightweight fiber that can be used in the curtain of the present invention. Not fully expressed. That is, as a result, the fiber is inferior in lightness, and is difficult to apply to the curtain of the present invention.

  The polymer B in the present invention is not particularly limited as long as it is incompatible with the polymer A as described above, and a wide variety of polymers can be used. Examples of the polymer include polyamide polymer, polyolefin polymer and other vinyl polymers, fluorine polymer, silicone polymer, elastomer, polycarbonate polymer, and cyclized polycondensation of carboxylic acid anhydride and diamine. Polyimide polymer, polyamideimide polymer, polyetherimide polymer, polybenzimidazole polymer formed by reaction of dicarboxylic acid ester and diamine, other polysulfone polymer, polyethersulfone polymer, aliphatic polyether Synthetic polymers such as polymer, aromatic polyether polymer, polyphenylene sulfide polymer, polyetheretherketone polymer, polyetherketoneketone polymer, polyarylate polymer, cellulose polymer, Chitin, etc. derivatives of chitosan, polymers derived from natural polymers, and the like other diverse polymers.

  More specifically, for example, polyolefins or other vinyl polymers in which a monomer having a vinyl group is synthesized by an addition polymerization reaction such as radical polymerization, anionic polymerization, or cationic polymerization, or a ring-opening polymerization reaction can be given. . Examples of polyolefins include homopolymers, copolymers, and derivatives of polyethylene, polypropylene, polybutylene, and polymethylpentene, and other vinyl polymers include polystyrene, polyacrylic acid, polymethacrylic acid, and polymethacrylic acid. Although polymers such as methyl, polyacrylonitrile, polytetrafluoroethylene, polyvinylidene fluoride, polyvinylidene chloride, polycyanidene chloride, and copolymers and derivatives thereof are mentioned, polymers synthesized by these addition polymerization reactions or ring-opening polymerization reactions Among them, a polyolefin polymer can be mentioned first as a preferable polymer from the viewpoint of low critical surface tension or low density described later.

  Among the preferred polyolefin-based polymers described above, polyolefins mainly composed of olefins are, for example, ethylene, propylene, butene, methylbutene, methylpentene, ethylpentene, hexene, ethylhexene, octene, decene, tetradecene, octadecene. And polyolefin using as a monomer. Among these polyolefins, a polyolefin having a main repeating structure of propylene, butene, or methylpentene is preferable because of its high melting point and low critical surface tension described later, and the main repeating structure in which propylene or methylpentene accounts for 80 mol% or more. A homopolymer or copolymer of polyolefin having In such a copolymer in which propylene or methylpentene accounts for 80 mol% or more, the copolymer is not particularly limited, but, for example, an aliphatic hydrocarbon or alicyclic group having 5 or more carbon atoms. Examples thereof include a vinyl compound having a hydrocarbon, an aromatic hydrocarbon, or a derivative thereof in the side chain. In particular, the polyolefin having methylpentene as a main repeating structure has an excellent melting point of 200 ° C. or higher and a low critical surface tension. Examples of the polyolefin include, but are not limited to, TPX manufactured by Mitsui Chemicals, Inc.

  In addition, for example, polyolefin polymers having a cyclic structure represented by the following chemical formula 1, chemical formula 2, or chemical formula 3, which are synthesized by ring-opening polymerization or addition polymerization of an alicyclic monomer, can be given.

Here, each of the substituents X and Y is a group selected from hydrogen, an alkyl group, an alicyclic group, a cyano group, an alkyl ester group, and an alicyclic ester group.

  As what has a structure of Chemical formula 1-Chemical formula 3, JSR Co., Ltd. "Arton" (trademark), Nippon Zeon Co., Ltd. "ZEONOR" (trademark), "ZEONEX" (trademark), Although “TOPAS” (registered trademark) manufactured by Polyplastics Co., Ltd. can be mentioned, polyolefin having a cyclic structure is not particularly limited thereto.

  The polyolefin-based polymer used as the polymer B may be a homopolymer using one kind of monomer alone, or may be a copolymer using a plurality of kinds. It may be a copolymer obtained by copolymerizing with a vinyl compound. Specific examples of the copolymer component include vinyl esters of saturated aliphatic carboxylic acids having 2 to 6 carbon atoms, acrylic acid esters and methacrylic acid esters derived from alcohols having 1 to 20 carbon atoms, Unsaturated carboxylic acids such as fumaric acid, maleic acid, itaconic acid, citraconic acid, tetrahydrophthalic acid, methyltetrahydrophthalic acid, nadic acid, acid halides, amides, imides, acid anhydrides and esters of the unsaturated carboxylic acids, Examples thereof include vinyl compounds such as styrene or styrene derivatives, acrylonitrile or acrylonitrile derivatives, vinyloxyalkyl derivatives (alcohol type or carboxylic acid type), or vinyl compounds having an aliphatic cyclic structure (alicyclic structure). In particular, the polyolefin polymer having the alicyclic structure as a copolymer component is also recognized as the polyolefin polymer having the above-described cyclic structure, and examples thereof include “Apel” (registered trademark) manufactured by Mitsui Chemicals, Inc. Further, the polyolefin polymer having the alicyclic structure is not limited thereto.

  Among the polyolefin polymers exemplified as preferred among these polymers, a polyolefin polymer having a main repeating unit of propylene and / or methylpentene, or a cyclic structure, in that the void formation of the formed fiber is high. A polyolefin polymer having alicyclic structure and a copolymer polyolefin polymer having an alicyclic structure are preferred.

  As the polymer B, among the polymers synthesized by the aforementioned addition polymerization reaction or ring-opening polymerization reaction, styrene, acrylic acid are preferable from the viewpoint of critical surface tension or glass transition temperature (Tg) described later. , Vinyl polymers using methacrylic acid, methyl methacrylate, or acrylonitrile as the main repeating structure. In particular, a vinyl polymer using styrene or methyl methacrylate as the main repeating structure is preferable because Tg is as high as 90 ° C. or higher, and when the fiber used in the present invention is used, the lightness described later is increased. Further, when these styrene, acrylic acid, methacrylic acid, methyl methacrylate, or acrylonitrile is used as the main repeating structure, a plurality of these may be copolymerized, and in particular, acrylonitrile is used as the second component. When used as the polymer B, the miscibility when the polymer A is a polyester polymer is excellent, and the lightness is further improved. The transparency of the resin itself is also excellent.

  In addition, examples of the polymer B in the present invention include polyether polymers in addition to the polyolefin polymer and the vinyl polymer. Of these, aromatic polyether polymers represented by polyphenylene ether are preferred. The polyphenylene ether may be a homopolymer mainly composed of phenylene oxide, or may be a copolymer obtained by copolymerizing the second component, and may be added within the range not impairing the gist of the invention. A modified polyphenylene ether obtained by alloying a polystyrene-containing polymer, a polyamide-based polymer, a polyester-based polymer, a polyolefin-based polymer, or the like may be used. Examples of the polyether polymer include “Iupiace” (registered trademark) and “Remalloy” (registered trademark) manufactured by Mitsubishi Engineering Plastics Co., Ltd., and “Noryl (registered trademark)” manufactured by GE Plastics Co., Ltd. Asahi Kasei Co., Ltd. “Zylon” (registered trademark), Sumitomo Chemical Co., Ltd. “Art Rex” (registered trademark), “Artly” (registered trademark), etc. Needless to say, preferred polymer B However, the polyether polymers listed as are not limited thereto.

  Alternatively, the polymer B in the present invention is preferably a polycarbonate polymer. The polycarbonate polymer may be a homopolymer mainly composed of bisphenol A and C═O, or may be a copolymer obtained by copolymerizing the third component, and the gist of the invention is impaired. As long as there are no additives, it may be a modified polycarbonate in which an additive is added, that is, an alloyed polystyrene polymer, polyamide polymer, polyester polymer, polymethacrylate polymer or the like. Examples of the modified polycarbonate include “Iupilon” (registered trademark) and “Novalex” (registered trademark) manufactured by Mitsubishi Engineering Plastics Co., Ltd., “Lexan” (registered trademark) manufactured by GE Plastics Corporation, "Caliber" (registered trademark) manufactured by Sumitomo Dow Co., Ltd., "Panlite" (registered trademark) manufactured by Teijin Chemicals Ltd., "Taflon" (registered trademark) manufactured by Idemitsu Petrochemical Co., Ltd. Needless to say, there is a polycarbonate polymer mentioned as a preferred polymer B, but the polymer is not limited thereto.

  As will be described later, the polymer B in the present invention preferably has no maleimide structure because the fiber itself is preferably not yellowish. In general, the maleimide structure is a structure obtained by reaction of maleic anhydride with ammonia or a primary amine, and there is a structure such as N-alkylmaleimide, N-cycloalkylmaleimide, or N-phenylmaleimide. An N-phenylmaleimide structure is known as an easy-to-treat material. When the polymer B has the maleimide structure, it is generally a yellowish polymer derived from the maleimide structure. Therefore, when blended with the polymer A to form a fiber, the fiber itself tends to be yellowish, and as a result, the application is limited, which is not preferable. In particular, when the polymer A is a polyester polymer, the maleimide structure has a very high affinity, but rather, the affinity becomes excessively high and the void formation tends to be poor. Therefore, there may be cases where sufficient lightness may not be exhibited, and in addition, since it is inferior in void formation, there is a case where it is not preferable for application because the light-shielding property of the fiber is lowered when used in the curtain of the present invention. . Alternatively, if a sufficient lightness is to be expressed in the fiber, the strength of the fiber tends to be low, which may not be practical. In particular, when the polymer B has a maleimide structure and has a maleic anhydride residue, it easily reacts when a polyester-based polymer is selected as the polymer A, and lightness is hardly manifested or is no longer light. Even if it is expressed, the fiber strength is remarkably inferior. Examples of the polymer having a yellowish maleimide structure include styrene maleimide polymer (type: MS-NA, etc.) manufactured by Electrochemical Co., Ltd.

  As the polymer B in the present invention, one of various polymers listed above may be used alone, or a plurality of them may be used in combination as long as the gist of the invention is not impaired.

The polymer B in the present invention preferably has a density of 1.0 g / cm ³ or less. When the density of the polymer B is 1.0 g / cm ³ or less, the lightness of the fiber itself applied to the curtain of the present invention is further increased, which is preferable. The polymer B is more suitable as the density is smaller, preferably 0.95 g / cm ³ or less, and particularly preferably 0.90 g / cm ³ or less. In the polymer B, the density is 1.0 g / cm ³ or less, for example, the above-mentioned polyolefin, ethylene, propylene, butene, methylbutene, methylpentene, ethylpentene, hexene, ethylhexene, octene, Decene, tetradecene, octadecene or the like can be used as a monomer. Particularly polypropylene with propylene as the main monomer density 0.91 g / cm ^3, and polymethylpentene specific gravity 0.83 g / cm ³ using methylpentene as a main monomer, they are preferred as having a small density. These polyolefins may be a homopolymer using one kind of monomer alone, or may be a copolymer using a plurality of kinds. Moreover, the copolymer which copolymerized these olefins and another ethylenically unsaturated compound may be sufficient, Specifically, the vinyl ester of the saturated aliphatic carboxylic acid which has 2-6 carbon atoms, Acrylic acid esters and methacrylic acid esters derived from alcohols having 1 to 20 carbon atoms, unsaturated carboxylic acids such as fumaric acid, maleic acid, itaconic acid, citraconic acid, tetrahydrophthalic acid, methyltetrahydrophthalic acid, nadic acid Acids or acid halides, amides, imides, acid anhydrides and esters of the unsaturated carboxylic acids, styrene or styrene derivatives, acrylonitrile or acrylonitrile derivatives, vinyloxyalkyl alcohols or derivatives thereof, vinyloxyalkyl carboxylic acids or their Ethi such as derivatives Emissions unsaturated compounds. One of these polymers B may be used alone, or a plurality of these polymers B may be used in combination as long as the gist of the invention is not impaired.

  Further, the average molecular weight of the polymer B in the present invention is not particularly limited, but the number average molecular weight is 2000 to 10 from the viewpoints of excellent kneadability with the polymer A, shape retention and rigidity in fibers. It is preferably 1,000,000,000, more preferably 5000 to 5,000,000, and even more preferably 10,000 to 1,000,000.

  The content of the polymer B in the present invention is preferably 1% by weight or more and 30% by weight or less, preferably 3% by weight, in that it is superior in lightness and has excellent yarn physical properties of the fiber itself used in the present invention. It is more preferably 20% by weight or less and even more preferably 3% by weight or more and 15% by weight or less.

  The polymer B of the present invention has a critical surface tension of 35 dyne in that it easily forms voids at the fiber blend interface used in the present invention, resulting in a smaller specific gravity and excellent lightness. / Cm or less, more preferably 33 dyne / cm or less, and even more preferably 32 dyne / cm or less. Moreover, although the critical surface tension of the polymer B is preferably as low as possible, the critical surface tension of the polymer B usually obtained is 10 dyne / cm or more. The preferred polymer B having a critical surface tension of 35 dyne / cm or less is preferably composed of propylene and / or methylpentene in an amount of 80 mol% or more among the polyolefins composed of the above-mentioned olefin monomers or other ethylenically unsaturated compounds. A homopolymer or copolymer, a vinyl polymer used as a main repeating structure selected from styrene, acrylic acid, methacrylic acid, methyl methacrylate, or acrylonitrile, or a main repeating structure, a polyolefin polymer having a cyclic structure, or Examples thereof include copolymer polyolefin polymers having an alicyclic structure, and homopolymers or copolymers in which methylpentene accounts for 80 mol% or more are particularly preferable.

  Further, the critical surface tension of the polymer A in the present invention is not particularly limited, but as described above, when discontinuous voids are generated in the fiber axis direction, the peelability from the polymer B is higher. Since it is preferable, it is preferable that it is 35 dyne / cm or more, and it is more preferable that it is 38 dyne / cm or more. For example, a polyester polymer such as polyethylene terephthalate, polypropylene terephthalate, and polybutylene terephthalate has a critical surface tension of about 43 to 46 dyne / cm, and an aliphatic polyester such as polylactic acid or polyglycolic acid has a critical surface tension of about 36 dyne / cm. cm. In addition, copolymer components that can increase the critical surface tension, for example, a copolymer polyester obtained by copolymerizing a component having a polar group such as sulfoisophthalate or a phosphate, co-polymerize these components having a polar group. Compared to unpolymerized polyester, it is preferable because it can have a larger critical surface tension. Nylon 6 and nylon 6, 6 have a critical surface tension of 46 dyne / cm. The critical surface tension is described in G. It is defined by the method.

  The polymer B in the present invention preferably has a melting point (Tm) of 150 ° C. or higher, more preferably 180 ° C. or higher, in that the heat resistance of the polyester fiber is good and the lightness at high temperature is excellent. . Here, the melting point (Tm) is F. of Examples described later. It is defined by the method. The polymer B satisfying the range of the melting point (Tm) is a single polymer in which propylene and / or methylpentene account for 80 mol% or more of the polyolefins composed of the above-mentioned olefin monomers or other ethylenically unsaturated compounds. In addition to a polymer or a copolymer, a polyolefin polymer having a cyclic structure and a copolymer polyolefin polymer having an alicyclic structure are particularly preferable.

The melt viscosity of the polymer B in the present invention is not particularly limited, and a polymer having a shear speed of 10 sec ^{-1 and} a shear viscosity of 10 to 10,000 [Pa · sec] at the melt spinning temperature of the polyester used is used. Usually, it is preferably 100 to 5000 [Pa · sec]. Here, the melt viscosity is described in J. It can be measured by this method.

  In the fiber used in the present invention, as described above, the polymer B forming the island component easily generates discontinuous voids in the fiber axis direction when the fiber is stretched, and the resulting fiber has high lightness. Thus, the glass transition temperature (Tg) of the polymer B is preferably 5 ° C. or more higher than the glass transition temperature (Tgp) of the polymer A. Here, the glass transition temperature (Tg) is F. of Examples described later. It is defined by the method. The glass transition temperature (Tg) of the polymer B is more preferably 10 ° C. or more higher than the glass transition temperature (Tgp) of the polymer A, more preferably 30 ° C. or more, and particularly preferably 50 ° C. or more. preferable. When Tg is higher than Tgp by 5 ° C. or more, not only is it generated by interfacial debonding between polymer A and polymer B in void formation at the time of stretching, but it is also expressed by splitting and debonding of polymer B itself. It becomes lighter and more excellent. Further, also in melt spinning, the polymer B is preferable because it solidifies at a higher temperature than the polymer A and forms an island structure that is advantageous for generating voids.

  The glass transition temperature (Tg) of the polymer B is preferably 85 ° C. or higher, more preferably 90 ° C. or higher, and 110 ° C. or higher in that it is more suitable for void formation. Is more preferable, and it is particularly preferable that the temperature is 130 ° C. or higher. As the polymer B satisfying this, a vinyl polymer used as a main repeating structure selected from styrene, acrylic acid, methacrylic acid, methyl methacrylate, or acrylonitrile alone or in plural, and a polyolefin polymer having a cyclic structure Or a copolymerized polyolefin polymer having an alicyclic structure, the aforementioned aromatic polyether polymer, the aforementioned polycarbonate polymer, a polysulfone polymer (such as “Udel” (registered trademark) of Teijin Amoco Engineering Plastics), poly Ethersulfone polymers (Amoco's "Radel A" (registered trademark), BASF's "Ultra Zone E" (registered trademark), Sumitomo Chemical's "Sumika Excel" (registered trademark), etc.), polyarylate polymers ( Unitika's “U polymer” "Mentioned as (R), etc.), those like are preferable. In addition, the glass transition temperature Tgp of each polyester is F. mentioned later. In the case of polyethylene terephthalate, it is about 72 ° C., polypropylene terephthalate is about 47 ° C., polybutylene terephthalate is about 24 ° C., polylactic acid is about 58 ° C., polycyclohexanedimethanol terephthalate. In the case of polyethylene naphthalate and about 122 ° C., respectively.

  Although the polymer B in the present invention is not particularly limited, it contains a small amount of additives such as a flame retardant, a lubricant, an antioxidant, a crystal nucleating agent, and a terminal group sealing agent as long as the gist of the invention is not impaired. You may do it.

  The fibers used in the present invention may have poor compatibility between the polymer A and the polymer B. Therefore, a compatibilizing agent may be contained. The compatibilizing agent in the present invention is a compound that controls the dispersion diameter of the polymer B by changing the interaction at the blend interface to increase the compatibility of the polymer B when the polymer B is contained in the sea component. As the compatibilizing agent, a wide variety of compounds such as a low molecular compound or a high molecular compound can be adopted. For example, as the low molecular compound, sodium dodecylbenzenesulfonate, sodium alkylsulfonate, glycerin monostearate, Anionic or cationic surfactants such as tetrabutylphosphonium paraaminobenzenesulfonate and amphoteric surfactants, poly (alkylene oxide) glycols such as polyethylene glycol, methoxypolyethylene glycol, polytetramethylene glycol, and polypropylene glycol, and ethylene oxide / propylene Nonionic surfactants, such as an oxide copolymer, are mentioned.

  Moreover, as a high molecular compound mentioned as a compatibilizing agent, what is necessary is just to use a high molecular compound with high compatibility or affinity with respect to each of the polymer A and the polymer B, for example, a polystyrene polymer, a polyacrylate type | system | group. Polymer, polymethacrylate polymer, poly (vinyl alcohol-ethylene) copolymer, poly (vinyl alcohol-propylene) copolymer, poly (vinyl alcohol-styrene) copolymer, poly (vinyl acetate-ethylene) copolymer, poly (vinyl acetate-propylene) Copolymers, poly (vinyl acetate-styrene) copolymers such as vinyl polymers or copolymers, ionomers, polysaccharides, polyalkylene oxides or poly (alkylenes) with improved heat resistance and melt plasticity by chemical modification of the side chain moiety Coxides of alkylene oxides and vinyl derivatives, such as xoxide-ethylene) and poly (alkylene oxide-propylene) copolymers, or derivatives of polyalkylene oxide, copolymers of alkylene terephthalate and alkylene glycol, alkylene terephthalate and poly (alkylene oxide) glycol Examples thereof include polymers such as copolymers, copolymers of alkylene terephthalate and polyalkylene diol, and the like. Among them, considering the fact that the effect as a compatibilizing agent is great and the yarn physical properties when forming the fiber in the present invention are good, polystyrene polymer, polyacrylate polymer, polymethacrylate polymer, alkylene terephthalate and Preferred are copolymers of alkylene glycol, copolymers of alkylene terephthalate and poly (alkylene oxide) glycol, poly (alkylene oxide) glycol, copolymers of alkylene terephthalate and polyalkylene diol, or derivatives of these polymers.

  Specific examples of alkylene terephthalate and polyalkylene diol, a copolymer of alkylene terephthalate and alkylene glycol, a copolymer of alkylene terephthalate and poly (alkylene oxide) glycol, or poly (alkylene oxide) glycol or a derivative thereof, which are considered preferable, are described below. The compatibilizer in the present invention is not limited to these.

  As a copolymer of alkylene terephthalate and polyalkylene diol, an alkylene terephthalate selected from ethylene terephthalate, propylene terephthalate, butylene terephthalate, pentamethylene terephthalate, hexamethylene terephthalate, etc., and polyalkylene diol selected from polyethylene diol, polybutylene diol, etc. One type of each of alkylene terephthalate and alkylene glycol may be used, or a plurality of types may be used. Specific examples include poly (ethylene terephthalate-polyethylene diol) copolymer, poly (propylene terephthalate-polyethylene diol) copolymer, poly (butylene terephthalate-polybutylene diol) copolymer, and the like. .

  As the copolymer of alkylene terephthalate and alkylene glycol, alkylene terephthalate selected from ethylene terephthalate, propylene terephthalate, butylene terephthalate, pentamethylene terephthalate, hexamethylene terephthalate, ethylene glycol, propylene glycol, butylene glycol (or tetramethylene glycol), penta It is a copolymer comprising an alkylene glycol selected from methylene glycol and hexamethylene glycol, and one or more of each of alkylene terephthalate and alkylene glycol may be used. Specific examples include, but are not limited to, polyethylene terephthalate-butylene glycol copolymer, polypropylene terephthalate-ethylene glycol copolymer, polybutylene terephthalate-tetramethylene glycol copolymer, and the like.

  As the copolymer of alkylene terephthalate and poly (alkylene oxide) glycol, alkylene terephthalate selected from ethylene terephthalate, propylene terephthalate, butylene terephthalate, pentamethylene terephthalate, hexamethylene terephthalate, and the like, diethylene glycol, triethylene glycol, poly (ethylene oxide) glycol, A copolymer comprising poly (alkylene oxide) glycol selected from dipropylene glycol, poly (propylene oxide) glycol, poly (ethylene oxide-propylene oxide) glycol composed of a copolymer of ethylene oxide and propylene oxide, and alkylene terephthalate And 1 each of poly (alkylene oxide) glycol It may be used by classes, or may also be used in combination. Although not particularly limited, specifically, polyethylene terephthalate-diethylene glycol copolymer, polyethylene terephthalate-poly (ethylene oxide) glycol copolymer, polybutylene glycol-poly (ethylene oxide) glycol copolymer, polypropylene terephthalate-poly (ethylene oxide) glycol copolymer And so on.

The main chemical structure of poly (alkylene oxide) glycol or its derivative is a group (or group) of aliphatic, aromatic, alicyclic, etc. carbon having a main chain and oxygen atoms bonded alternately. Any poly (alkylene oxide) glycol having a single alkylene oxide as a repeating unit represented by the following general formula (4) can be used.
_{- [(CH 2) a -O} ] m - ··· (4)
Examples of satisfying the formula (4) include poly (ethylene oxide) glycol (a = 2), poly (propylene oxide) glycol (a = 3), poly (tetramethylene oxide) glycol (a = 4), and the like. Of poly (alkylene oxide) glycols.

The poly (alkylene oxide) glycol may be an alternating, random or block copolymer of different alkylene oxides as represented by the following general formula (5).
_{- {[(CH 2) a} -O] m - [(CH 2) b -O] n} x - ··· (5)
As satisfying the formula (5), for example, a poly (oxyethylene-oxypropylene) copolymer (a = 2 or 3, b = 2 or 3, and a and b may be the same or different. ), Poly (oxytetramethylene-oxyethylene-oxypropylene) copolymer (a = 1 or 2 or 3, b = 1 or 2 or 3, and a and b may be the same or different.) For example, copolymers of different alkylene oxides.

  Further, as the poly (alkylene oxide) glycol, the polyalkylene oxide represented by the above general formula (4) or (5) may be used alone or in a range not impairing the gist of the invention. You may use what combined 2 or more types in the range which does not impair the main point of invention.

  One of these compatibilizers which are low molecular weight compounds or high molecular weight compounds may be used alone, or two or more may be used in combination as long as the gist of the invention is not impaired. The compatibilizers include, but are not limited to, polyethylene oxide Alcox (registered trademark) manufactured by Meisei Chemical Industry, Hytrel (registered trademark) manufactured by Toray DuPont, and polystyrene-based styrene resin manufactured by Nippon Steel Chemical. (Registered trademark) and the like can be mentioned as preferable ones.

  The content of the compatibilizer in the fiber used in the present invention is such that the compatibilization is more effectively expressed and the fiber properties of the resulting polyester fiber are excellent, so that the content of the compatibilizer is Is preferably from 10 to 200% by weight, more preferably from 20 to 100% by weight, based on the polymer B.

  The fiber used in the present invention is a fiber composed of the polymer A and the polymer B, but the discontinuous voids in the fiber axis direction in the fiber are dense and excellent in lightness. The average dispersion diameter in the fiber cross section perpendicular to the fiber axis is preferably 5 μm or less. The fiber used in the present invention is a fiber in which the polymer B is blended. As described above, when the polymer A forms the sea component and the polymer B forms the island component, the island component is not aligned in the fiber axis direction. It is continuously dispersed or elongated. Therefore, the area of the blend interface between the polymer A and the polymer B becomes very large, and when the lightweight fiber used in the present invention is formed, it is in the fiber axis direction in the fiber cross section perpendicular to the fiber axis. The number of discontinuous voids is extremely large, and as a result, the lightness is excellent. However, when the island component in the fiber is continuous in the fiber axis direction, that is, when the fiber is a core-sheath composite fiber or a sea-island composite fiber, it is no longer a blended fiber but its composite interface (core-sheath interface or The area of the sea-island interface) is very small compared to the blended fiber, and voids are not generated, or it is significantly reduced and light in weight.

  Further, as described above, when the average dispersion diameter in the fiber cross section perpendicular to the fiber axis of the polymer B is 5 μm or less, the area of the blend interface becomes very large as described above, and discontinuous voids in the fiber axis direction. In addition to the extremely large number of fibers, the resulting fibers are extremely lightweight, and the generated voids are not excessively large and are unlikely to become fiber defects. It will be excellent. However, when the average dispersion diameter in the fiber cross section perpendicular to the fiber axis of the polymer B is larger than 5 μm, the area of the blend interface decreases, so the number of voids tends to decrease and the lightness tends to be inferior. . Alternatively, the fiber strength may be lowered. The average dispersion diameter in the fiber cross section perpendicular to the fiber axis of the polymer B in the present invention is preferably smaller than the single yarn diameter of the fiber, preferably 3 μm or less, more preferably 1 μm or less, and even more preferably 0. .5 μm or less. However, since the polymer B is incompatible with the polymer A as described above, the average dispersion diameter is 0.01 μm or more, preferably 0.02 μm or more. In addition, the ratio of the average dispersion diameter to the diameter of the fiber cross section perpendicular to the fiber axis (in other words, the fiber diameter) is such that more voids are formed or fiber properties are excellent [average fiber diameter / island component The value of [dispersion diameter] is preferably 5 or more, more preferably 10 or more, and even more preferably 100 or more. However, the ratio is preferably 100,000 or less and more preferably 10,000 or less from the viewpoint that voids are generated more efficiently.

The modified cross-section fiber used in the present invention preferably has a chromaticity b ^* of +6 or less because the curtain used is superior in whiteness. The chromaticity b ^* of +6 or less is an indicator that the fiber itself has little yellowness and excellent whiteness. As a result, the curtain of the present invention is excellent in whiteness, and as a result, has high light shielding properties. Also, in terms of design properties, the use or purpose of use of the curtain is not limited. In order for the chromaticity b ^{* to} be +6 or less, it is preferable to add as little yellowish color as possible in the fiber. More specifically, it is preferable to use only a very small amount of the polymer B having a strong yellow color, or not to add a very large amount even if the polymer B has a weak yellow color. The chromaticity b ^* is more preferably +4 or less. As for the lower limit, the smaller the chromaticity b ^* is, the better. However, if it is −20 or more, there is no problem, but it is preferably −15 or more, more preferably −10 or more, and particularly preferably −5 or more.

  The fiber used at least in part in the curtain of the present invention has discontinuous voids in the fiber axis direction. By having voids, the fiber of the present invention is excellent in lightness and preferable, and since the voids are discontinuous, it is unlikely to be a defect in the fiber structure, and the fiber strength is also excellent. The reason why discontinuous voids are formed in the fiber axis direction of the fiber used in the present invention or details of the mechanism are unclear. However, it is likely that the voids are such that (1) the blend interface between polymer A and polymer B incompatible with A peels off, and (2) the polymer B is polymer A when spinning or stretching. (3) The polymer A itself or the complex of the polymer A and the polymer B is torn apart from the interface between the polymer A and the polymer B, It is presumed that phenomena such as splitting are manifested in a composite rather than a single manner, and a discontinuous void is formed in the fiber axis direction due to a synergistic effect. Furthermore, since this void generation appears randomly in the fiber, it is assumed that the void is discontinuous in the fiber axis direction.

  The discontinuous voids in the fiber axis direction are not particularly limited, but in the fiber cross section perpendicular to the fiber axis, the average diameter of the voids is preferably 0.10 to 1.5 μm. When the average diameter is within this range, the lightness is excellent and the voids are not crushed. The average diameter is more preferably 0.15 to 1.0 μm, and particularly preferably 0.20 to 1.0 μm. The average diameter of the voids is C.C. Measured by the term.

  This void preferably has an inclined structure in the fiber cross section perpendicular to the fiber axis direction. Here, the inclined structure means that the fiber has a void distribution in which the diameter of the void existing at each position gradually increases from the fiber surface layer portion toward the fiber center portion in the fiber cross section. In the above, the diameter ratio d2 between the average diameter d1 of the voids present in the region encompassed by the circumscribed circle and the inscribed circle of the fiber cross section and the average diameter d2 of the voids present in the region encompassed by the inscribed circle When / d1 is 1.30 or more, it is defined as having an inclined structure. d1 and d2 are those of Example C. described later. It calculates by image analysis using the fiber cross-sectional photograph obtained by the method. In order to improve the light blocking property for light of any wavelength, d2 / d1 ≧ 1.5 is preferable, and d2 / d1 ≧ 1.8 is more preferable. More preferably, d2 / d1 ≧ 2.0. The upper limit of d2 / d1 is not particularly limited, but about 100 or less is appropriate. For example, in the case of the three-leaf type irregular cross-section fiber shown in FIG. 1, the region encompassed by the circumscribed circle and the inscribed circle is denoted by 3, and the region encompassed by the inscribed circle is denoted by 4.

  Further, regarding the discontinuous voids in the fiber axis direction, the average number of voids discontinuous in the fiber axis direction having an average diameter of 0.1 μm or more in the fiber cross section perpendicular to the fiber axis (that is, the average number of voids) is: Since it is preferable that the voids are not easily crushed, the number is preferably 300 to 100,000, more preferably 400 to 50,000, and particularly preferably 500 to 40,000. The average number of voids is described later in C.I. It is calculated by the method in the section.

  The irregular cross-section fiber used in the present invention may have a skin layer without voids on the fiber surface. By having the skin layer, the fiber is not scraped by bending or abrasion, and the durability of the voids existing inside the fiber is increased and the light shielding property is excellent. Further, it is preferable because fiber strength and curtain shape recoverability are improved. Thereby, it can be suitably used as a curtain application requiring wear resistance. When the skin layer is present, if the thickness of the skin layer is too thick, the volume in which voids are formed inside the fiber is reduced, resulting in a fiber that is inferior in light-shielding properties or lightness. It is preferably 1/5 or less of the circumscribed circle diameter D1, more preferably 1/10 or less, and even more preferably 1/15. Moreover, since the effect of a skin layer will be lose | eliminated when too thin, it is preferable that it is 1/10000 or more of D1. This skin layer can be formed at the same time as the voids described later are formed. For this reason, this skin layer is composed of a blend polymer of polymer A and polymer B.

  Further, the porosity indicating the volume ratio of the void in the fiber is not particularly limited, but when used in the curtain of the present invention, it can be excellent in lightness, so that the void is 15% or more. It is preferable to have a porosity, and it is more preferable to have a porosity of 25% or more. The higher the porosity, the better the light weight and the better, but the upper limit of the porosity that can be achieved in consideration of the fiber properties and the like is 90% or less. The porosity is the same as in Example B.1. Calculated in terms.

  The fiber used in the present invention is not particularly limited, but is excellent in form stability and weather resistance, or adopts shrinkage characteristics in various usage environments in various materials for clothing or industry. The shrinkage when held for 15 minutes in hot water (70 ° C.) or hot water (98-100 ° C.) is preferably 50% or less, more preferably 30% or less, and 25% or less. Even more preferred.

  Further, the fiber used in the present invention is not particularly limited, but in addition to excellent shape stability, it is preferable that deformation is small in view of the allowable deformation degree of various materials for clothing or industry. Therefore, the elongation of the fiber at 20 ° C. is preferably 100% or less, more preferably 60% or less, and even more preferably 50% or less. Further, the lower limit of the elongation of the fiber is not particularly limited, but is preferably 3% or more, more preferably 5% or more as achievable in production.

  The means for producing the fiber used in the present invention is not particularly limited, and a commonly used synthetic fiber production method can be employed. For example, a resin melt or solution is simultaneously discharged from a nozzle. Although various manufacturing methods such as a melt spinning method, a wet spinning method, a dry spinning method, and a dry and wet spinning method can be adopted, the fiber cross-sectional shape required in the present invention can be freely controlled. The melt spinning method is preferred because it has advantages. In the case of the fiber obtained by the melt spinning method, if necessary, it is once cooled below the glass transition temperature of the polymer A used in the present invention, preferably 100 to 10,000 m / min, more preferably 300. After taking up at a take-up speed of ˜8000 m / min, particularly preferably from 500 to 6000 m / min, without taking up or once taken up, preferably at a draw ratio of 1.5 times or more, more preferably 3.0 In the case of a drawing process or a filament, a drawing false twisting process is preferably performed at a drawing ratio of at least twice, particularly preferably at a drawing ratio of 4.0 times or more.

  Here, as a method for expressing the void, a method capable of applying an elongation stress to the fiber and expressing the void is preferably employed. For example, a method of drawing an undrawn yarn obtained by winding on a spinning at a high magnification , A method of continuously drawing at a high magnification without winding up undrawn yarn at the time of spinning, a method of taking up at a high speed in spinning, or heating the wound fiber or running fiber, Or the method etc. which shrink | contract the polymer B in a fiber by irradiating specific light may be sufficient, and each arbitrary methods can be employ | adopted. Among these methods, the process is simple and the control of void formation is easy, so that the undrawn yarn obtained by winding the fiber taken up by spinning is drawn at a high magnification, and the fiber taken up by spinning is used. A method of stretching an unstretched yarn obtained in a container at a high magnification, or a method of continuously stretching at a high magnification without taking up or putting it in a container after winding the unstretched yarn during spinning. preferable. In particular, in the drawing step, the fiber is heated or used as a heated pin-like material, a roller-like material, a plate-like material, a heated liquid heat medium, a vapor-like heat medium, or other medium. After being heated by a non-contact type heater using an electromagnetic wave or the like, the film is stretched in one or more stages.

  In order to generate the above-mentioned voids more effectively, it is preferable to stretch simultaneously with heating by using a pin-like material, a plate-like material, a heated liquid heat medium or a vapor-like heat medium under high tension, In particular, heating and stretching in a warm water bath using warm water heated to 40 ° C. to 90 ° C. as a heating medium is particularly preferable because fibers are extremely excellent in void formation and remarkably excellent in lightness.

  The stretched fiber may be wound as it is, but is preferably wound after being heat set at a temperature of the stretching temperature + 10 ° C. or higher. Alternatively, in the case of a short fiber, after being drawn, it is crimped and then subjected to a heat treatment, and is cut to a length of 0.05 mm to 200 mm. Alternatively, heat treatment may be performed later.

  Further, in the drawing false twisting process, the fiber is heated after being drawn or not heated, or the undrawn yarn is heated in a pin-like product, a roller-like product, a plate-like product, or a heated liquid product. After heating with a heat medium, a vapor-like heat medium, a non-contact type heater, or the like, false twisting is performed with a disk or belt. Although the stretched false twisted fiber is not particularly limited or is not particularly limited, it is preferably wound after being heat set at a temperature equal to or higher than the stretch false twist temperature + 10 ° C.

  In the fiber used in the present invention, a polymer other than the polymer A, the polymer B, and the above-mentioned compatibilizing agent, which is preferable as described above, may be blended within a range that does not impair the gist of the present invention.

  The apparent specific gravity of the fiber used in the present invention is preferably 1.20 or less. When used for at least a part of the curtain, if the apparent specific gravity of the fiber is small and the same degree of light shielding property is obtained, the light weight is extremely excellent, which is preferable. On the other hand, when the mass is equal, a curtain having better light shielding performance can be formed, which is very excellent. The apparent specific gravity of the fiber is preferably 1.10 or less, more preferably 1.05 or less, and particularly preferably 1.00 or less. Further, although the smaller the apparent specific gravity is, the better and preferable, it is possible to produce and produce a fiber having an apparent specific gravity of usually 0.10 or more, and a general use of 0.40 or more, as the lower limit can be produced.

  The fiber strength of the fiber used in the present invention is preferably as high as possible, and is preferably 4.0 cN / dtex or more in consideration of practicality. In particular, when used for at least part of a curtain, it is required to be a strong material. The strength of the fiber is preferably 4.2 cN / dtex or more, more preferably 4.5 cN / dtex or more, and even more preferably 4.7 cN / dtex or more. Higher strength is preferable, but fibers with a strength of 10 cN / dtex or less can be obtained at most, and fibers with a strength of 8 cN / dtex or less can be obtained for general use.

  The fiber used in the present invention may retain a small amount of additives such as a flame retardant, a lubricant, an antioxidant, a crystal nucleating agent, a terminal group sealing agent, and a light-proofing agent as long as the gist of the invention is not impaired.

  The structure (fabric) forming the curtain of the present invention is not particularly limited as long as it exhibits lightness and light shielding properties without impairing the gist of the present invention, and may be a woven fabric, a knitted fabric, or a nonwoven fabric. However, since a higher-density fiber structure is excellent in light-shielding properties, a woven fabric is preferable.

  As a woven structure of the woven fabric, for example, as a single woven fabric, a plain weave such as broad, voile, lone, gingham, tropical, taffeta, shantung and desin, twill weave such as denim, surge and gabardine, satin weave such as satin and doskin, Nanako weaves such as baskets, Panama, mats, hopsacks, oxfords, woven fabrics such as grosgrains, ottomans, hair cords, steep slashes such as French twills, herringbones, broken twills, slow slashes, Yamagata slashes, broken slashes , Jumping slashes, curved slashes, ornamental slashes, irregular sashes, layered sachets, spread sachets, day and night shimeko, honeycombs, hacks, pears, niagaras, etc. As a double woven fabric that has become a single woven fabric, warp double weaves such as picket and puffer weave, double wefts such as Bedford cord, air-weaving, Double weaving such as weaving, etc. Also, as pile weaving, weaving pile weaving such as Bendin and Corten, warp pile weaving such as towel, velvet, velvet, etc., etc. are also available Examples include entangled fabrics, and patterned fabrics such as dobby weave and jacquard weave, which are appropriately selected according to the intended use and purpose.

  The knitting structure of the knitted fabric includes, for example, flat knitting such as tengu and single, rib knitting such as rubber knitting and milling, pearl knitting such as links, kanoko, satin, accordion knitting, small pattern, lace knitting, and back hair Weft knitting such as knitting, one-sided knitting, two-sided knitting, ripple, Milan rib, double picket, warp knitting such as tricot, Russell, Miranese, etc., which are appropriately selected according to the use and purpose.

  Examples of the structure of the nonwoven fabric include nonwoven fabrics formed by methods such as chemical bond method, thermal bond method, needle punch method, water jet punch (spun lace) method, stitch bond method, felt method, etc. It is appropriately selected according to the purpose. As the blind curtain, a non-woven fabric formed by die cutting or the like can be suitably used.

  Of course, the above-mentioned woven fabric, knitted fabric or non-woven fabric may be subjected to processing such as conventional scouring, dyeing, heat setting, etc. as long as it does not detract from the gist of the present invention. Physical processing such as processing, flexible processing, heat setting, bonding processing, laminating processing, coating processing, antifouling processing, water repellent processing, antistatic processing, flameproof processing, insect repellent processing, sanitary processing, foam resin processing, etc. In addition to the above chemical processing, application processing such as microwave application, ultrasonic application, far-infrared application, ultraviolet application, and low-temperature plasma application may be performed.

  The curtain of the present invention is a blended fiber comprising a polymer A having fiber-forming ability and a polymer B incompatible with the polymer A within a range not impairing the gist of the invention. Other fibers other than the irregular cross-section fibers having discontinuous gaps in the axial direction and having a fiber cross-section having an irregularity of 1.20 or more may be used. That is, a mixed fabric using other fibers selected from, for example, cellulose fibers, wool, silk, stretch fibers, acetate fibers, and the like such as synthetic fibers, semi-synthetic fibers, and natural fibers may be used.

  The curtain of the present invention may be dyed including mixed goods, and dyeing may be performed at a fiber stage before weaving or weaving or after forming a fabric.

  When the curtain of the present invention is assumed to be exposed to strong sunlight, or to be used over time such as washing with water or dry cleaning, the strength of the fabric deteriorates in a short period of time, changes in dimensions, discoloration / fading, etc. In order not to occur, a light-resistant agent may be blended, the fabric may be subjected to shrink-proof processing, or a dye or pigment exhibiting excellent light fastness when dyeing or printing may be used.

  Hereinafter, the present invention will be described specifically and in more detail by way of examples. Naturally, the present invention is not limited to the following examples. In addition, the physical-property value in an Example was measured with the following method.

A. Measurement of fiber strength Using a Tensilon tensile tester manufactured by Orientec Co., Ltd., an initial sample length of 200 mm and a tensile speed of 200 mm / min were measured, and an average value measured five times was used as a measured value.

B. Measurement of apparent specific gravity of fiber and calculation of porosity The apparent specific gravity of the fiber was measured and calculated by the following methods (a) and (b).

(A) When the apparent specific gravity of the fiber is 0.659 or more JIS-L-1013 (1999) 8.17.1 (published by the Japanese Standards Association, chemical fiber filament yarn test method) If the apparent specific gravity of the fiber is 1 or more at a temperature of 20 ° C. ± 0.1 ° C., an aqueous NaBr solution is used. If the apparent specific gravity of the fiber is between 1 and 0.789, water is reduced to the heavy liquid. If the apparent specific gravity of the fiber is between 0.789 and 0.659 in the mixed liquid using ethyl alcohol as the liquid, the mixed liquid using ethyl alcohol as the heavy liquid and n-hexane as the light liquid, The equilibrium state after the fiber was allowed to stand for 30 minutes was confirmed, and as described in 8.17.1 above, the specific gravity value of the mixed liquid that did not float or sink was measured, and the average specific gravity value obtained by measuring five fibers The value was defined as a measured specific gravity value (Q).

(B) When the apparent specific gravity of the fiber is less than 0.659 100 g ± 10 g of the following K.I. Weighed in advance using the tubular knitted fabric prepared by the method described in 1. In addition, we fixed the weight of which weight and volume were known in advance to the tubular knitted fabric, and added it to ion-exchanged water prepared at 4 ° C ± 1 ° C. After submerging and defoaming with ultrasonic waves for 5 minutes, the volume of the tubular knitting was measured, and the average value of the specific gravity values of 10 fabrics was defined as the measured specific gravity value (Q).

The following formula was used for calculation of the porosity.
Porosity (%) = 100 (1-Q / R)
R = 100 / [S1 / V1 + S2 / V2 + (100-S1-S2) / Vp]
However,
R: Apparent specific gravity of fiber without voids S1: Addition amount of polymer B (% by weight)
S2: Amount of compatibilizer added (% by weight)
V1: Density of polymer B (g / cm ³ )
V2: density of compatibilizer (g / cm ³ )
Vp: density of polymer A (g / cm ³ )
For the density (V1, V2, Vp) of the polymer B, the compatibilizing agent and the polymer A, the average value of the values measured three times based on the above-mentioned (a) floatation method was used. For example, when the polymer A is polyethylene terephthalate, 1.34 is obtained for an undrawn yarn and 1.38 is obtained for a drawn yarn, and these numbers are used. However, since Alcox (registered trademark, type E-30 or R-150), which is poly (ethylene oxide) manufactured by Meisei Chemical Industry Co., Ltd., which will be described later, could not be measured by the flotation method, the density was calculated as 1.0 g / cm ^3. did.

C. Confirmation of single fiber diameter, average diameter of voids, average number of voids, discontinuity of voids in fiber axis direction, slant structure of voids in fiber cross section, single fiber is placed on carbon tape affixed to sample stage After performing platinum vapor deposition treatment (deposition film pressure: 25-50 angstrom treatment time: about 120 seconds), it is applied to a focused ion beam (FIB) cutting-scanning electron microscope (SEM) observation device (STRADB235 manufactured by FEI). Then, with a Ga focused ion beam accelerated at an acceleration voltage of 30 kV, rough cutting (current: about 7000 pA, processing time: about 20 minutes) and precision cutting (current: about 3000 pA, processing time: about 4 minutes) 2 When observing the fiber cross section in an atmosphere with a vacuum degree of 1.4 × 10 ⁻¹³ Pa in the process, the sample was cut perpendicular to the fiber axis direction, and the fiber longitudinal section When observing, the vicinity of the fiber center of the sample was cut in parallel to the fiber axis direction with a length of 5 times or more the fiber diameter. After cutting, using a scanning electron microscope possessed by the apparatus, in an atmosphere with a degree of vacuum of 1.4 × 10 ⁻¹⁹ Pa, with a sample tilt of 52 degrees and an acceleration voltage of 5 kV, a magnification of 200 to 100 The fiber cross section (confirmation of fiber diameter) and the fiber longitudinal section (confirmation of discontinuity in the fiber axis direction of voids) were performed at an arbitrary magnification of 1,000 times. Here, the discontinuity was confirmed by the presence of voids that were interrupted in the fiber axis direction in one longitudinal cross-sectional photograph. Evaluation was made as ◯ when there were discontinuous voids in the fiber axis direction, and x when the voids were continuous or had no voids. The average diameter and average number of voids discontinuous in the fiber axis direction were calculated by digitizing the image of the fiber cross section in black and white and using WinROOF (version 2.3) manufactured by Mitani Corporation. As for the average diameter of the voids, the areas of all of the top 100 voids are calculated from the largest in the order of the voids present on the cross-sectional image, and the average value is calculated from the diameters of the voids calculated from the area values and determined to be substantially circular. Was calculated by calculating. Further, the average number of voids having an average diameter of 0.1 μm or more is calculated by counting the number of voids having a diameter of 0.1 μm or more after calculating the diameters of all the voids in the same manner as described above in the fiber cross sections. The average number of voids was determined for five arbitrary fiber cross sections separated by a method larger than the fiber diameter. Further, the average diameter d1 of the voids existing in the region encompassed by the circumscribed circle and the inscribed circle of the irregularly shaped fiber and the average diameter d2 of the voids present in the region encompassed by the inscribed circle are calculated by the above-described image analysis method. The value of d2 / d1 was determined. In addition, when there was no void existing in the area encompassed by the circumscribed circle and the inscribed circle, it was judged as having no inclined structure and indicated as x.

  Since the cross-sectional photograph is a photograph observed at a sample inclination of 52 degrees, the circumscribed circle, the inscribed circle, and the circle with a diameter of D3 are ellipses whose major axis is diameter and minor axis is 0.79 × diameter. It becomes.

D. Confirmation of incompatibility and average dispersion diameter in fiber of polymer B Dye the block in which the fiber is embedded in epoxy resin with ruthenium oxide solution, and cut it in the direction perpendicular to the fiber axis with an ultramicrotome. An ultra-thin section having a single fiber cross section was prepared, and an arbitrary electron magnification of 5,000 to 1,000,000 times at an accelerating voltage of 75 kV using a transmission electron microscope (TEM) observation apparatus (H-7100FA type manufactured by Hitachi, Ltd.). The cross section was observed at a magnification, and the resulting photograph was digitized in black and white. The cross-sectional photograph was subjected to image analysis using WinROOF (version 2.3) manufactured by Mitani Corporation, a computer software, to confirm the incompatibility and the average dispersion diameter of the polymer B. For the average dispersion diameter, the areas of all of the top 100 polymers B in the descending order of the polymer B present on one cross-sectional photograph were calculated, respectively, and the weight calculated by determining that the area was substantially circular from the area value. An average value of the diameters of the combined B was obtained, and an average value was further calculated from three average values calculated for each of three arbitrary different cross-sectional photographs to obtain an average dispersion diameter. Further, regarding incompatibility, if the average dispersion diameter was 10 nm or more, it was judged to be incompatible.

E. Evaluation of stretchability during fiber production For stretchability in the stretching process, when 1 kg of unstretched yarn is stretched, single yarn breakage occurs, and the number of times the single yarn is wound around the stretching roller is evaluated. Alternatively, when the single yarn is wound 20 times or more x (impossible), the number of times the single yarn is wound is 10 times or more and 19 times or less △ (inferior), and the number of times the single yarn is wound is 4 times or more and 9 times or less ○ (Good), the number of times the single yarn was wound was 3 or less, and was evaluated as a double circle (excellent).

F. Measurement of Glass Transition Temperature (Tgp or Tg) and Melting Point (Tm) Measurement was performed with a differential scanning calorimeter (DSC-2) manufactured by PerkinElmer Co., Ltd., with a sample temperature of 10 mg and a heating rate of 16 ° C./min. The definitions of Tm and Tg are as follows: after observing the endothermic peak temperature (Tm1) observed once at a rate of temperature increase of 16 ° C./min, hold at a temperature of Tm1 + 20 ° C. for 5 minutes, and then rapidly cool to room temperature. (The quenching time and the room temperature holding time are kept for 5 minutes), and when the measurement is again performed at a temperature rise of 16 ° C./min, the endothermic peak temperature observed as a step-like baseline deviation is defined as Tg, and the melting temperature of the crystal And the endothermic peak temperature observed as Tm.

G. Measurement of critical surface tension In a film made of polymer A or polymer B, pure water 72.8 dyne / cm, ethyl alcohol (special grade or higher) 22.3 dyne / cm, dioxane 33.6 dyne / cm, hexane 18.4 dyne / cm When 5 drops of 20% aqueous ammonia 59.3 dyne / cm were used and the liquid was placed on a flat sample under the conditions of 20 ° C., 60% humidity and standing, The angle formed by the solid plane in contact with the droplet and the surface of the droplet in contact with the air layer is measured as the contact angle θ, and cos θ is plotted against the surface tension of the liquid used (Zisman plot). The critical surface tension was obtained by extrapolating the plotted points of the surface tension when wetting with water, that is, when cos θ = 1.

H. Measurement of weight average molecular weight when polylactic acid is used as polymer A High performance liquid chromatograph LC-6A manufactured by Shimadzu Corporation (differential refractometer RID-6A, pump LC-9A, column oven CTO-6A, column Shim -Pack GPC-801C, -804C, -806C, -8025C) and chloroform as a solvent (flow rate 1 mL / min, sample amount 200 μL (however, 0.5 w / w% sample dissolved in chloroform)) Obtained by measuring at a column temperature of 40 ° C.

I. Measurement of Intrinsic Viscosity (IV) and Sulfuric Acid Relative Viscosity ηr For the intrinsic viscosity (IV), a sample was dissolved in an orthochlorophenol solution and measured at 25 ° C. using an Ostwald viscometer. The sulfuric acid relative viscosity ηr is obtained by dissolving a sample with 98% sulfuric acid to a concentration of 1% by weight, measuring the flow time at a constant temperature of 25 ° C. with an Ostwald viscometer, and standardizing the ratio of the time of the sample solution to the flow time of sulfuric acid. The sample was converted into a specific viscosity, which was used as the relative viscosity of sulfuric acid.

J. et al. Measurement of Melt Viscosity Using Capillograph 1B manufactured by Toyo Seiki Co., Ltd., under a nitrogen atmosphere, with a barrel diameter of 9.55 mm, a nozzle length of 10 mm, and a nozzle inner diameter of 1 mm, the piston pushing speed is 1, 2, 5, 10, 20, respectively. Measurements were made for 50, 100, 200, and 500 mm / min, and the obtained values were plotted with a shear rate [sec ⁻¹ ] on the X axis and a shear viscosity [Pascal second] on the Y axis on a logarithmic scale, and a shear rate of 10 sec ⁻ The shear viscosity value at ¹ was determined. And the average value of the value calculated | required 5 times was made into the measured value of melt viscosity. Regarding measurement time, 5 measurements were completed within 30 minutes in order to prevent deterioration of the sample.

K. Measurement of chromaticity b ^* value Using a multifilament, a cylindrical knitting with a gauge width of 20 / inch (2.54 cm) and a pitch length of 1 mm was prepared, and eight sheets of this fabric were stacked. Minolta Camera Co., Ltd. Using a color difference meter MINOLTA CR-200, a sample obtained by visually observing that the color of the white plate does not show through the white plate attached to the apparatus is used as a sample. Then, after calibrating using the white plate attached to the apparatus, the b ^* of the eight-layered fabric sample was measured. The result of measuring three times for each measurement point in each sample and three times at different measurement points was averaged to be b ^{* of the} sample.

L. Using identification BIO-RAD Ltd. FT-IR measuring apparatus FTS-40 maleimide structure, the transmitted light intensity is measured, (peak derived from the C-N ^bond) 1184cm -1 around, 1384cm ^-1 (5-membered ring structure When it was confirmed that all of the peaks in the vicinity of 1710 cm ⁻¹ (peaks derived from C═O of maleimide) were observed, it was determined to have a maleimide structure.

M.M. Evaluation method of curtain light-shielding property (average transmittance of visible light) Weaving the obtained fiber for both warp and weft, obtaining a plain weave with a warp density of 120 yarns / inch and a weft density of 90 yarns / inch, Four sheets of this fabric are stacked, and the sample is stacked on a 5 × 5 cm sample plate and visually confirmed that the color of the sample plate does not show through. The spectral transmittance characteristics in the wavelength region of 360 nm to 740 nm with respect to the standard white plate of the four-layered fabric sample were measured in the transmittance measuring mode of a spectrocolorimeter (CM-3700d manufactured by Minolta Co., Ltd.). In each sample, the average transmittance in the wavelength region was determined from the spectral transmittance characteristics obtained by averaging the results of measuring three times for each measurement location and three times at different measurement locations. For evaluation of light shielding properties, those having an average transmittance of 10% or less are evaluated as double circles (excellent), those having 10% or more but less than 20% are evaluated as ◯ (good), and those having 20% or more are evaluated as △ (inferior). did.

Reference Example 0.03 parts by weight of 85% aqueous solution of phosphoric acid as a coloring inhibitor and 0.03 part by weight of a polycondensation catalyst were added to a low polymer obtained by ordinary esterification reaction from 166 parts by weight of terephthalic acid and 75 parts by weight of ethylene glycol. A polycondensation reaction was carried out by adding 0.06 part by weight of antimony and 0.06 part by weight of cobalt acetate tetrahydrate as a toning agent to obtain a commonly used polyethylene terephthalate having an IV of 0.70.

  Using this polyester, melt spinning is performed by using a biaxial extruder type melt spinning machine at a spinning temperature of 290 ° C. using a die having a round shape, a hole diameter of 0.3 mm, and a number of holes of 24. A polyester multifilament fiber having a round shape of 265 dtex-24 filaments was obtained. No yarn breakage occurred during spinning, and the yarn making property was excellent.

  When the obtained polyester fiber is stretched, the yarn feeding speed of the yarn feeding roller is 10 m / min, and a length of 80 cm is used for stretching between the first roller and the second roller installed next to the yarn feeding roller. The bath length was set at a bath temperature of 80 ° C., and the fiber was passed through the bath to draw at a draw ratio of 5.0 times. The second roller was heat-treated at 130 ° C. and then cooled. The yarn was wound after being cooled to Tg of polyester or less by a roller. No thread breakage occurred during drawing, and the drawability was excellent. The results of the reference example are shown in Table 1.

Example 1
When performing melt spinning using the polyester obtained in the Reference Example using a twin-screw extruder type melt spinning machine, the polymer B is “Polymethylpentene” (TPX (registered trademark)) manufactured by Mitsui Chemicals, Inc. , Type RT18, hereinafter abbreviated as PMP, which is different from PMP 881 described later), and “Hytrel” (registered trademark, type) manufactured by Toray DuPont Co., Ltd. as a compatibilizing agent. 4057, hereinafter referred to as Hytrel) is 20% by weight with respect to the amount of PMP added, and the base hole has the cross-sectional shape shown in FIG. Using a die having a width of 0.08 mm, a hole depth of 0.4 mm, and a hole number of 24, melt spinning and forming a 259 dtex-24 filament with a three-leaf type cross section To obtain a filament fiber. And when extending | stretching using a warm water bath similarly to a reference example, it extended | stretched by the magnification 5.2 times with the same yarn feeding speed.

  The cross-sectional shape of the obtained drawn yarn was a three-leaf type, and the degree of deformity was 1.50. Further, d2 / d1 was 2.1, and an inclined structure of voids was formed inside the fiber. The plain woven fabric made of the obtained fiber was a curtain that was excellent in both lightness and light-shielding properties, and had good texture. The results of Example 1 are shown in Table 1.

Comparative Example 1
In Example 1, a blended multifilament having a round cross section of 260 dtex-24 filaments using the same polymer A, polymer B and spinning method as in Example 1 except that the same spinneret as in the reference example was used. Got. Similarly to Example 1, the draw ratio was drawn at 5.2 times to obtain a drawn yarn having a round cross-sectional shape. The obtained plain woven fabric made of drawn yarn is excellent in lightness but has poor light shielding properties, and as a result, inferior in properties as a curtain.

Example 2
Except for using a die capable of forming a flat cross-sectional fiber having a slit length of 0.6 mm, a slit width of 0.08 mm, and a hole depth of 0.4 mm as the die, melt spinning and a magnification of 5.0 times were performed in the same manner as in Example 1. Stretching at was performed. No yarn breakage occurred during spinning, and the yarn making property was excellent. During drawing, breakage of the yarn and winding of a single yarn around the roller did not occur, and the drawability was good.

  The obtained single-filament cross-sectional shape of the drawn yarn was a flat type with an irregularity of 2.5, and d2 / d1 was 1.6. This fiber has a light-shielding anisotropy characteristic of flat fibers, is excellent in lightness, and is useful as a light-shielding material. The plain weave curtain and the texture were both good and good.

Example 3
The base hole has the cross-sectional shape shown in FIG. 4 as the base, and is the same as in Example 1 except that a base having a slit length of 0.5 mm, a slit width of 0.08 mm, a hole depth of 0.4 mm, and a number of holes of 24 is used. Then, melt spinning was performed to obtain a blend deformed cross-section multifilament fiber having 257 dtex-24 filaments and a cross-sectional shape of five-leaf type. Then, the film was stretched at a magnification of 5.1 times in the same manner as in Example 1. No yarn breakage occurred during spinning, and the yarn making property was excellent. During drawing, breakage of the yarn and winding of a single yarn around the roller did not occur, and the drawability was good.

  The drawn fiber had a single fiber cross-sectional shape of a five-leaf type, an irregularity of 2.0, and d2 / d1 of 1.8. This fiber has irregular reflection characteristics peculiar to multi-leaf type fibers, that is, the fiber itself has a high light-shielding property, is excellent in light weight, and is useful as a light-shielding material. The plain weave curtain and the texture were both good and good.

Examples 4-7
When performing melt spinning similar to Example 3, as polymer B, norbornene resin “Arton” (registered trademark, Example 4, type F5023, hereinafter Arton) manufactured by JSR Corporation, manufactured by Mitsubishi Engineering Plastics Co., Ltd. “Iupiace” (registered trademark, Example 5, type AH90, hereinafter referred to as PPE), ZEONOR manufactured by Nippon Zeon Co., Ltd. (registered trademark, Example 6, type 1600, hereinafter referred to as ZEONOR), “TOPAS” manufactured by Polyplastics Co., Ltd. (Registered trademark, Example 7, type 6017, hereinafter TOPAS), and various contents were changed, and melt spinning was performed in the same manner as in Example 1 except that no compatibilizer was used. The same method as in the reference example using the hot water bath was used for Examples 4, 6, and 7 at a magnification of 5.2 times, and for Example 5 at a magnification of 4.5 times. Performed stretched, the cross-sectional shape to obtain a blend modified cross-section multifilament fiber of 3-lobe. The plain woven fabric made of the obtained fiber was a curtain that was excellent in both lightness and light-shielding properties (good in Example 5) and good in texture. The results are shown in Table 2.

Example 8
Dimethyl terephthalate 130 parts (6.7 mole parts), 1,3-propanediol 114 parts (15 mole parts), calcium acetate monohydrate 0.24 parts (0.014 mole parts), lithium acetate dihydrate To a low polymer obtained by transesterifying 0.1 parts (0.01 mole parts) of salt and distilling off methanol, 0.065 parts of trimethyl phosphate and 0.134 parts of titanium tetrabutoxide were added. The polycondensation reaction was performed while distilling off 1,3-propanediol, and a chip-shaped prepolymer was obtained. The obtained prepolymer was further subjected to solid phase polymerization at 220 ° C. under a nitrogen stream to obtain polytrimethylene terephthalate (hereinafter abbreviated as PPT) of IV1.12.

When melt spinning and drawing using the obtained PPT, 10% by weight of Mitsui Chemicals PMP (however, type DX881, hereinafter referred to as PMP881) is used as the polymer B, and “Estyrene” (manufactured by Nippon Steel Chemical Co., Ltd.) (Registered trademark, type MS200, hereinafter referred to as “styrene”) is contained in an amount of 29 wt% with respect to the added amount of PMP881, respectively, and a spin temperature of 260 ° C. is used using a die from which a five-leaf fiber similar to that in Example 3 is obtained. The undrawn yarn is a method using melt spinning and a hot water bath in the same manner as in the reference example except that the cross-sectional shape of the 243 dtex-24 filament is a 5-leaf type polyester multifilament fiber and the draw ratio is 4.4 times. Stretching was performed. The obtained drawn yarn was excellent in fiber physical properties such as strength, chromaticity b ^* or specific gravity, and excellent in drawability. The plain woven fabric made of the obtained fiber was a curtain that was excellent in both lightness and light-shielding properties, and had good texture. The results of Example 8 are shown in Table 3.

Example 9
In Example 8, 10% by weight of “Appel” (registered trademark, type 6015T, hereinafter referred to as Appel) manufactured by Mitsui Chemicals as polymer B, and “Hytrel” (registered trademark, type 4057) manufactured by Toray DuPont Co., Ltd. as a compatibilizing agent. , Hereinafter referred to as Hytrel) was added in an amount of 13% by weight based on the added amount of the apel, and melt spinning was performed in the same manner as in Example 8, and the cross-sectional shape of the 252 dtex-24 filament was a 5-leaf type polyester multi A filament fiber was obtained and stretched in the same manner as in the reference example by a method using a warm water bath at a magnification of 4.2 times. The obtained drawn yarn had excellent fiber properties such as strength, chromaticity b ^* or specific gravity, and excellent drawability. The plain woven fabric made of the obtained fiber was a curtain that was excellent in both lightness and light-shielding properties, and had good texture. The results of Example 9 are shown in Table 3.

Examples 10 and 11
After adding 0.005 part by weight of tin octylate as a catalyst to 300 parts by weight of L-lactide and carrying out nitrogen substitution, the reaction was carried out at 170 ° C. to produce polylactic acid having a weight average molecular weight of 153,000 (hereinafter referred to as PLA). (Abbreviation).

When the obtained PLA was stretched by a method using melt spinning and a hot water bath in the same manner as in Example 3, 10% by weight of PMP 881 as polymer B was used. As a solubilizer, "Alcox" (registered trademark) manufactured by Meisei Chemical Industry Co., Ltd. contains type R-150 (hereinafter referred to as R-150) having an average molecular weight of 100,000, 30% by weight with respect to the added amount of PMP881, respectively. The spinning temperature is 240 ° C., the temperature of the hot water bath is 70 ° C., and the draw ratio is 4.5 times. A polyester multifilament fiber having a five-leaf cross section was obtained. The obtained drawn yarn had excellent fiber physical properties such as strength, chromaticity b ^* or specific gravity, and excellent drawability. The plain woven fabric made of the obtained fiber was a curtain that was excellent in both lightness and light-shielding properties, and had good texture. The results of Examples 10 and 11 are shown in Table 3.

  The curtain of the present invention has excellent lightness and light shielding properties, and any form as a curtain can be selected. For example, a drape curtain, a blind curtain, an accordion curtain, a roll curtain, a lace curtain, and a casement curtain These are used in various places in buildings such as houses, stores, and offices, or for in-vehicle use, as light blocking the line of sight of people and people introduced, or as part of space partitions, etc. It is preferably used for notebooks used in the theater and theaters, as well as for warmth hanging at the entrance of stores. Of these, drape curtains naturally have superior light-shielding properties and lighter weight.

It is explanatory drawing which shows the method of calculating the irregularity degree in this invention. It is explanatory drawing which shows an example of the nozzle | cap | die hole shape which can obtain the irregular cross-section fiber (flat cross section) in this invention. It is explanatory drawing which shows an example of a nozzle | cap | die hole shape which can obtain the irregular cross-section fiber (three-leaf type cross section) in this invention. It is explanatory drawing which shows an example of the nozzle | cap | die hole shape which can obtain the irregular cross-section fiber (5-leaf type cross section) in this invention.

Explanation of symbols

1: circumscribed circle 2: inscribed circle 3: area included between circumscribed circle and inscribed circle 4: area included inside inscribed circle D1: diameter of circumscribed circle D2: diameter of inscribed circle X: Slit length Y: Slit width d: Slit width (flat section thread cap)
L: Slit length (Flat section thread cap)

Claims (9)

  A blend fiber comprising a polymer A having fiber-forming ability and a polymer B incompatible with the polymer A, having discontinuous voids in the fiber axis direction, and having a fiber cross section A curtain comprising at least a part of a modified cross-section fiber having a modified degree of 1.20 or more.   In the fiber cross section perpendicular to the fiber axis direction of the irregularly shaped fiber, the average diameter d1 of the voids included between the circumscribed circle and the inscribed circle, and the average diameter d2 of the voids included inside the inscribed circle The curtain according to claim 1, wherein d 2 / d 1 ≧ 1.30 is satisfied.   2. The number of voids discontinuous in the fiber axis direction having an average diameter of 0.1 μm or more in the fiber cross section perpendicular to the fiber axis direction of the irregularly shaped fiber is 300 to 100,000. Or the curtain of 2.   The average diameter of voids discontinuous in the fiber axis direction in the fiber cross section perpendicular to the fiber axis direction of the irregularly shaped fiber is 0.10 to 1.50 µm. The curtain according to item 1.   The curtain according to any one of claims 1 to 4, wherein the apparent specific gravity of the irregular cross-section fiber is 1.20 or less.   The curtain according to any one of claims 1 to 5, wherein the average transmittance of visible light having a wavelength of 360 nm to 740 nm is 20% or less.   The said polymer A consists of at least 1 sort (s) chosen from a polyester-type polymer, a polyamide-type polymer, and a polyolefin-type polymer, The curtain of any one of Claims 1-6 characterized by the above-mentioned.   The curtain according to any one of claims 1 to 7, wherein the content of the polymer B in the modified cross-section fiber is 1 wt% or more and 30 wt% or less. The curtain according to any one of claims 1 to 8, wherein a chromaticity b ^* value of the irregularly shaped cross-section fiber is 5 or less.

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