JP4581428B2 - Light-weight blended fiber with excellent light-shielding properties, and fiber products made of the same - Google Patents

Description

  The present invention relates to a lightweight blended fiber having excellent light shielding properties. More specifically, the present invention relates to a lightweight blended fiber that has good lightness and physical properties and excellent light shielding properties.

  Non-transparent fibers are demanded as a recent need for clothing fibers, and the demand for materials for sportswear such as tennis wear and swimwear, or uniform materials such as white clothing is particularly increasing. In addition, with the declining birthrate and aging population, the popularity and establishment of outdoor sports, and energy conservation, attention has been focused on the development of lightweight and highly heat-resistant clothing and industrial materials.

  Generally, polymers used for synthetic fibers are often transparent, and fiber products made of synthetic fibers have the disadvantage that they are easy to see through. Therefore, by incorporating a light hiding agent such as titanium oxide, it is generally highly light-shielding. A method of using fibers is employed (see Patent Document 1). However, the addition of a small amount of the light-screening agent is insufficient in light-shielding properties and the effect of preventing see-through, and conversely, if added in a large amount, the texture of the resulting fiber becomes hard or due to the high concentration of the light-screening agent blended. In addition, there is a risk that the device parts that the traveling yarn contacts when passing through the subsequent process may be remarkably worn, and further, the light concealment agent has a large specific gravity, so that the lightness of the fiber is poor.

  On the other hand, proposals have been made to increase the irregular reflection of light by providing hollow portions or voids inside the fiber, thereby providing light shielding and light weight.

  For example, a hollow composite fiber containing a specific amount of fine particles and a fluorescent white pigment has been proposed (see Patent Document 2). In this technique, by adopting two kinds of components both containing fine particles and a fluorescent white pigment and forming a two-layer hollow fiber, it is possible to surely produce a fiber with good whiteness of the fiber. Although it is possible, it is necessary to increase the hollow ratio in order to develop sufficient lightness and light shielding properties. As a result, the hollow part is cracked or the hollow part is continuously present in the fiber axis direction. In addition to the fear of becoming a fiber that is easily crushed and has poor lightness and light-shielding properties, it is inferior to the general versatility of the technology because a special base must be used.

Moreover, the polyester fiber which has the micropore connected to the fiber inside is proposed (refer patent document 3). In this technique, an unstretched polyester fiber having a low degree of orientation formed by a melt molding method is neck-stretched so that a porous portion is present inside the fiber, whereby a density of 1.30 g / cm ³ or less of ultraviolet and visible Although it is described that it is possible to make a polyester fiber having excellent light shielding properties, since the fiber is formed of polyester alone, the void formation is poor, and sufficient light shielding properties and light weight are exhibited. It was necessary to perform excessive stretching, and it was extremely difficult to maintain a stable neck stretching.

  In addition, a porous hollow fiber having a hollow portion having a pore diameter of 0.14 μm or more continuous along the length direction of the fiber has been proposed (see Patent Document 4). In the island-island composite fiber, the island part uses a component soluble in hot water or alkali, and has a hollow part continuous along the length direction of the fiber by eluting the island part. However, there is no part facing the external force in the hollow part, and the hollow part is crushed by the external force, resulting in a fiber with poor lightness and light shielding properties. In order to elute the island part at a preferable rate, it is necessary to carry out heating, and the resulting fiber becomes a fiber with extremely low heat shrinkage, and is subjected to a texture processing after forming a fabric. However, this technique lacks versatility with very limited applications.

A lightweight polyester fiber composed of a polyester resin and a styrene / maleimide resin having a molecular weight of 60 to 170,000 has been proposed (see Patent Document 5). The lightweight polyester fiber is a fiber having a large number of fine cavities that are manifested by the separation of the polyester resin and the styrene / maleimide resin. In order to achieve sufficient light-shielding and light weight by peeling off styrene / maleimide resin and polyester resin, it is very high. Drawing tension was required, and as a result, yarn breakage in the drawing process was likely to occur, and yellowing caused by styrene / maleimide resin was observed in the obtained drawn yarn.
JP-A-53-94623 (Claims) JP 11-350256 A (claims, paragraph [0030]) JP-A-7-310231 (Claims, paragraph [0015]) JP-A-8-226209 (Claims, paragraph [0018]) JP 2000-154427 A (claims, paragraph [0012])

  An object of the present invention is to solve the above-mentioned problems of the prior art, and is a light-weight blend that has excellent light-shielding properties, light-shielding properties, lightweight properties, excellent fiber physical properties such as boiling water shrinkage and residual elongation, and good strength. To provide fiber.

The present invention relates to a fiber excellent in light-shielding properties, and as a result of extensive studies to obtain a lightweight blended fiber useful for various clothing materials or industrial materials, a specific fiber structure containing a specific substance and As a result, it has been found that the drawbacks of the prior art can be solved and further advantages can be imparted, and the present invention has been achieved.
That is, the present invention is a blend fiber obtained by blending a main component thermoplastic polymer A having fiber-forming ability, a thermoplastic polymer B having no maleimide structure in the molecular skeleton, and titanium oxide as a light shielding agent. A lightweight blended fiber having excellent light-shielding properties, having a large number of voids, having a boiling water shrinkage represented by the following formula (1) of 2 to 30%, and a residual elongation of 5 to 50% It is to provide.
(1) S = (1-L / L ₀ ) × 100
S: Boiling water shrinkage (%)
L ₀ : skein of drawn yarn, original length of skein measured at initial load 0.09 cN / dtex L: skein measured at L ₀ was treated in boiling water for 15 minutes under substantially no load, and air-dried Skein length measured under initial load 0.09cN / dtex

  The light-weight blended fiber having excellent light-shielding properties obtained by the present invention has a light-shielding agent in the fiber and has a large number of fine voids, so that it has excellent light-shielding properties and lightness, and is practically optimal in boiling water shrinkage. Have a residual elongation. In addition, since the voids are fine and can be discontinuous in the fiber axis direction, the voids are not easily crushed and are not likely to be a defect in the fiber structure. Therefore, the strength can be 4.0 cN / dtex or more, for example, sports clothing (golf wear, Gateball, baseball, tennis, soccer, table tennis, volleyball, basketball, rugby, American football, hockey, athletics, triathlon, speed skating, ice hockey, etc.), uniforms such as lab coats, underwear, T-shirts, shirts, Suitable for swimwear, infant clothing, women's clothing, men's clothing, elderly clothing, outdoor clothing (shoes, bags, supporters, socks, mountaineering), and other vehicle interior materials such as automobiles, railways, airplanes, and ships. And shading materials used for ropes, tents, shading curtains, blinds, etc. Reflective material between, BCF, carpet, or also suitably used in packaging materials, such as used for various transportation.

  The thermoplastic polymer A forming the lightweight blended fiber having excellent light shielding properties of the present invention has fiber forming ability. The fiber in the present invention refers to a thin and long shape, and may be a long fiber (filament) or a short fiber (staple) generally referred to, or a very short fiber used for electric flocking, A pile may be used, and any polymer that can have these fiber shapes is recognized as having fiber-forming ability and is not particularly limited.

  The thermoplastic polymer A forming the lightweight blend fiber having excellent light-shielding properties of the present invention is not particularly limited as long as it is a polymer having fiber-forming ability. Polyester polymers and polyamides are generally used as polymers. Examples thereof include polymer polymers, polyacrylic polymers, polyimide polymers, polyolefin polymers and other vinyl polymers, fluorine polymers, cellulose polymers, silicone polymers, elastomers, and various other engineering plastics.

  More specifically, for example, in polyolefin polymers and other vinyl polymers synthesized by a mechanism in which a monomer having a vinyl group such as radical polymerization, anionic polymerization, and cationic polymerization is generated by an addition polymerization reaction, polyethylene, polypropylene , Polybutylene, polymethylpentene, polystyrene, polyacrylic acid, polymethacrylic acid, polymethyl methacrylate, polyacrylonitrile, polytetrafluoroethylene, polyvinylidene fluoride, polyvinylidene chloride, poly (vinylidene chloride), etc. For example, it may be a polymer obtained by homopolymerization such as polyethylene alone or polypropylene alone, or a copolymer polymer formed by conducting a polymerization reaction in the presence of a plurality of monomers. Well, for example, styrene and Doing polymerization in methyl methacrylate presence poly - but polymers copolymerized as (styrene methacrylate) is produced, it may be a polymer which is such a copolymer.

  Further, for example, polyamide polymers formed by the reaction of carboxylic acid or carboxylic acid chloride and amine can be mentioned. Specifically, nylon 6, nylon 7, 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 other aromatics, aliphatics, alicyclics as long as they do not impair the gist of the present invention Aromatic dicarboxylic acid and aromatic, aliphatic, alicyclic diamine component, or one compound such as aromatic, aliphatic, alicyclic, etc., used alone is an aminocarboxylic acid compound having both carboxylic acid and amino group It may be a polyamide polymer in which the third and fourth copolymer components are copolymerized.

  Moreover, for example, a polyester polymer formed by esterification reaction of carboxylic acid and alcohol can be mentioned. Specifically, the polyester polymer referred to in the present invention is not particularly limited, and examples thereof include a polymer formed from an ester bond of a dicarboxylic acid compound and a diol compound. Examples thereof include polyethylene terephthalate, polypropylene terephthalate, polybutylene terephthalate, polyethylene naphthalate, and polycyclohexanedimethanol terephthalate. Although not particularly limited, the polyester polymer formed from the ester bond of the dicarboxylic acid compound and the diol compound may be copolymerized with other components within a range not impairing the gist of the present invention. As the dicarboxylic acid compound of the copolymer component, 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, etc. Aromatic, aliphatic, and alicyclic dicarboxylic acids and their alkyl, alkoxy, allyl, aryl, amino, imino, and halide derivatives, adducts, structural isomers, optical isomers, and the like. Among the 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 polyester polymer may be a polymer in which one compound such as aromatic, aliphatic, alicyclic, etc. is mainly composed of a hydroxycarboxylic acid compound having both a carboxylic acid and a hydroxyl group as a main repeating unit. For example, polylactic acid, poly (3-hydroxypropionate), poly (3-hydroxybutyrate), poly (3-hydroxybutyrate validate), etc. Poly (hydroxycarboxylic acid) can be mentioned, and other than these, poly (hydroxycarboxylic acid) can be aromatic, aliphatic, alicyclic dicarboxylic acid, or aromatic as long as the gist of the present invention is not impaired. , Aliphatic and alicyclic diol components may be used, or plural types of hydroxycarboxylic acids are copolymerized It may be.

  Other polymers having fiber-forming ability of the present invention include polycarbonate polymers formed by transesterification of alcohol and carbonic acid derivatives, polyimide polymers formed by cyclization polycondensation of carboxylic acid anhydrides and diamines, and dicarboxylic acids. Synthesis of polybenzimidazole polymers formed by the reaction of acid esters and diamines, as well as polysulfone polymers, polyether polymers, polyphenylene sulfide polymers, polyetheretherketone polymers, polyetherketoneketone polymers Examples also include polymers derived from natural polymers such as polymers, cellulosic polymers, chitin and chitosan derivatives.

Among these polymers having fiber-forming ability, the thermoplastic polymer A preferably has a large critical surface tension γ _cA as described later, a low tension at the time of stretching, and a void is easily developed at the time of stretching. As the thermoplastic polymer A, a polyester polymer or a polyamide polymer is preferable, and a polyester polymer is more preferable because it can be stretched with a low stretching tension during stretching. Of these polyester polymers, polyester polymers in which the main repeating unit is ethylene terephthalate, propylene terephthalate, butylene terephthalate, or lactic acid are preferred in that they are more versatile and have excellent fiber-forming properties, and the main repeating unit is ethylene terephthalate. More preferred are polyester polymers. These polyamide polymers such as nylon 6 or polyester polymers such as polyethylene terephthalate, polypropylene terephthalate and polybutylene terephthalate both have a critical surface tension γ _cA of about 43 dyne / cm.

  As the polyester polymer preferable as the thermoplastic polymer A of the present invention, a polyester having an intrinsic viscosity (IV) usually used for synthetic fibers can be used. Although not particularly limited, for example, if it is polyethylene terephthalate, IV is preferably 0.4 to 1.5, and more preferably 0.5 to 1.3. 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.

    The content of the thermoplastic polymer A in the light-weight blend fiber excellent in light-shielding property of the present invention is 50% by weight or more because it is a main component, but the content of 50% by weight or more is particularly limited. Any content can be taken. In particular, since it is preferable that the fiber properties have high strength, the polyester content in the blended fiber is preferably 70% by weight or more, more preferably 80% by weight or more, and even more preferably 85% by weight or more. .

  As the thermoplastic polymer A, one kind of polymer selected from these may be used alone, or a plurality of kinds may be used in combination as long as the gist of the invention is not impaired.

  It is necessary that the light blend fiber excellent in light-shielding properties of the present invention contains a light hiding agent. The light hiding agent in the present invention is an agent that absorbs or reflects light in the ultraviolet, visible, and infrared wavelength regions of 0.36 to 0.74 μm alone, and improves the light blocking property of the fiber. It consists of inorganic components. When different polymers are blended, irregular reflection occurs at the composite interface due to the difference in the refractive index of each polymer, but the light concealing agent does not include this effect. The light masking agent may be present in either the thermoplastic polymer A or the thermoplastic polymer B as long as it is in the blend fiber, and although there is no particular limitation, the light masking agent is more uniformly dispersed. It is preferably contained in at least the thermoplastic polymer A. By allowing a specific amount of light-screening agent to be present in the fiber and a specific amount of voids to be present at the interface between the thermoplastic polymer A and the thermoplastic polymer B, 0.36 to 0 in the ultraviolet, visible and infrared wavelength regions Light in the entire wavelength range of .74 μm is efficiently absorbed or reflected by the light concealing agent and efficiently reflected by the gap. Surprisingly, by having these light concealing agents and voids, it was difficult to achieve when the light concealing agent or voids exist alone, the light transmittance in the entire wavelength range described later is 10% or less, It has been found that it is possible to obtain a blended fiber that is excellent in light weight and has practically suitable boiling water shrinkage and residual elongation. The reason for this is unknown, but for example, there are voids due to interfacial delamination between the light hiding agent and the thermoplastic polymer A and / or voids due to interfacial delamination between the light hiding agent and the thermoplastic polymer B, It is considered that a dense structure with a high light-shielding efficiency is formed synergistically by forming a structure in which the gaps are densely filled, or when a light shielding agent enters between the gaps.

The light masking agent in the present invention, to exhibit the effect of the present invention, intended to uniformly disperse the thermoplastic polymer A and / or thermoplastic polymer B, titanium oxide like view of dispersibility and light-shielding properties It is done . The titanium oxide that is preferred in the present invention is not particularly limited, and commonly used anatase type, rutile type, and brookite type crystalline titanium oxides are used singly or in combination. Since physical properties such as density, refractive index, light reflection and absorption characteristics differ depending on the crystal form, they can be properly used depending on the purpose and application. Further, although the particle diameter of titanium oxide used in the present invention is not particularly limited, the average particle diameter is preferably 0.01 to 1 μm in that a fiber having higher light shielding properties can be obtained. It is more preferable that it is 0.05-0.7 micrometer.

  The purity of the light hiding agent in the light blend fiber excellent in light-shielding property of the present invention is not particularly limited. However, the higher the purity, the higher the dispersibility in the thermoplastic polymer A and / or the thermoplastic polymer B. From the viewpoint of more uniformly dispersing, 99% or more is preferable, and 99.9% or more is more preferable.

  The content of the light hiding agent in the light blend fiber excellent in light-shielding property of the present invention is not particularly limited, but the light-shielding property is more effectively expressed, and the resulting blend fiber is excellent in light weight, and The content of the light-screening agent is preferably 0.01 to 3% by weight with respect to the total weight of the fiber in that it is excellent in process passability during production. And it is more preferable that it is 0.05 to 2 weight% at the point which comprises light-shielding property and lightweight property with sufficient balance, and it is still more preferable that it is 0.10 to 1 weight%.

  The method for adding the light hiding agent to the thermoplastic polymer A in the present invention is not particularly limited. For example, (A) the polymerization reaction of the thermoplastic polymer A is stopped in the normal polymerization reaction of the thermoplastic polymer A. A method of adding a light hiding agent at an arbitrary stage prior to the above, (B) a method of adding a light hiding agent during spinning of the thermoplastic polymer A, and melt-kneading under normal pressure or reduced pressure by a kneader such as an extruder or a static mixer, (C) In a normal polymerization reaction of thermoplastic polymer A, a light hiding agent is added at a high concentration, and thermoplastic polymer A to which no light hiding agent is added is simultaneously added and diluted by a kneader such as an extruder or a static mixer. , A method of melt-kneading under normal pressure or reduced pressure, (D) a solution of a light-screening agent at any stage before discharging in spinning of the thermoplastic polymer A Method in which contained in the thermoplastic in the polymer A discharged from such a nozzle-shaped tube, but the like, preferably the aforementioned (A), is employed a method (B) or (C).

  The thermoplastic polymer B in the present invention forms a blend fiber with the thermoplastic polymer A as will be described later, and forms an island in the cross section of the single fiber, that is, substantially non-phasic with respect to the thermoplastic polymer A. It is melted. In the present invention, the term “incompatible” means that the thermoplastic polymer A and the thermoplastic polymer B are not compatible with each other in the molecular chain size order of the polymer and are formed by the thermoplastic polymer B in the thermoplastic polymer A. The average diameter of components (calculated by the method of Example G below) refers to those having a size of at least 10 nm. When the thermoplastic polymer A and the thermoplastic polymer B are compatible, that is, when the average domain size formed by the component B is 10 nm or less, the thermoplastic polymer B described above is formed with the thermoplastic polymer A although blend fibers are formed. The islands formed are excessively small and do not have voids, or the voids necessary to become fibers excellent in lightness are not sufficiently developed, and as a result, blend fibers having inferior lightness are not preferable.

  The thermoplastic polymer B of the present invention is not particularly limited as long as it does not have a maleimide structure and is incompatible with the thermoplastic polymer A as described above, and a wide variety of thermoplastic polymers should be used. Can do. For example, polyamide polymer, polyolefin polymer and other vinyl polymers, fluorine polymer, silicone polymer, elastomer, polycarbonate polymer, polyimide polymer formed by cyclization polycondensation of carboxylic acid anhydride and diamine, dicarboxylic acid Polybenzimidazole polymers formed by the reaction of esters and diamines, polysulfone polymers, aliphatic polyether polymers, aromatic polyether polymers, polyphenylene sulfide polymers, polyetheretherketone polymers, polymers Examples thereof include synthetic polymers such as ether ketone ketone polymers, cellulose polymers, polymers derived from natural polymers such as chitin and chitosan derivatives, and various other engineering plastics.

More specifically, for example, polyolefins and other vinyl polymers synthesized by a mechanism in which a monomer having a vinyl group such as radical polymerization, anionic polymerization, or cationic polymerization is formed by addition polymerization reaction or ring-opening polymerization reaction. In the case of polyolefins, homopolymers, copolymers, and derivatives of polyethylene, polypropylene, polybutylene, and polymethylpentene can be used as polyolefins, and polystyrene, polyacrylic acid, polymethacrylic acid can be used as other vinyl polymers. , Polymethyl methacrylate, polyacrylonitrile, polytetrafluoroethylene, polyvinylidene fluoride, polyvinylidene chloride, poly (vinylidene cyanide), and copolymers and derivatives thereof. Among the polymers which are synthesized by a polymerization reaction, may be mentioned critical surface tension described later, preferable from the viewpoint of density or glass transition temperature T _g,, the polyolefin polymer is first.

  Among the preferred polyolefin-based polymers, first, as a polyolefin mainly composed of olefins, for example, ethylene, propylene, butene, methylbutene, methylpentene, ethylpentene, hexene, ethylhexene, octene, decene, tetradecene, octadecene as monomers In addition to the polyolefin used as the polymer, a polyolefin polymer having a cyclic structure represented by the following chemical formula 1, chemical formula 2, or chemical formula 3, for example, 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.

  Examples of those having the structure include polyolefins having a cyclic structure, such as Arton (registered trademark) manufactured by JSR Corporation, Zeonoa (registered trademark) manufactured by Nippon Zeon Co., Ltd., and the like. is not.

  These polyolefin polymers may be homopolymers using one kind of monomer alone, or may be a copolymer using two or more kinds, and further copolymerize olefins with other vinyl compounds. It may be a copolymer. 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 alicyclic structure. In particular, examples of the polyolefin-based polymer having the alicyclic structure as a copolymerization component include, for example, Apel (registered trademark) manufactured by Mitsui Chemicals, Inc. Of course, the copolymerized polyolefin-based polymer having the alicyclic structure is this. It is not limited to.

  Of the polyolefin polymers exemplified as preferred among these thermoplastic polymers B, polyolefin polymers having propylene and / or methylpentene as the main repeating unit in view of high void formation of the fibers formed, or Polyolefin polymers having a cyclic structure and copolymer polyolefin polymers having an alicyclic structure are preferred.

  The thermoplastic polymer B of the present invention includes a polyether polymer in addition to the polyolefin polymer, and among them, an aromatic polyether polymer typified by polyphenylene ether is preferable. 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. It may be a modified polyphenylene ether alloyed with a contained component, that is, a polystyrene polymer, a polyamide polymer, a polyester polymer, a polyolefin polymer, or the like as a second component. Examples of the modified polyphenylene ether include Iupiace (registered trademark) and Remalloy (registered trademark) manufactured by Mitsubishi Engineering Plastics Co., Ltd., Noryl (registered trademark) manufactured by GE Plastics Co., Ltd., and Asahi Kasei Co., Ltd. Zylon (registered trademark), Art Rex (registered trademark) manufactured by Sumitomo Chemical Co., Ltd., Artley (registered trademark), and the like. Needless to say, aromatic polyether polymers mentioned as preferred thermoplastic polymers are these. It is not limited to.

  As described above, the thermoplastic polymer B in the present invention needs to have no maleimide structure in the molecular skeleton. When the thermoplastic polymer has the maleimide structure, as described above, not only is the demerit that the resulting fiber yellows, but the gap between the polyester and the thermoplastic polymer is too high. It is not preferable because not only the lightness is insufficient and sufficient lightness is not exhibited, but also the light shielding property of the fiber obtained by inferior void formation is lowered. Examples of the thermoplastic polymer having a maleimide structure include styrene maleimide polymer (type: MS-NA, etc.) manufactured by Electrochemical Co., Ltd.

  As the thermoplastic polymer B in the present invention, one kind of these polymers may be used alone, or a plurality of kinds may be used in combination as long as the gist of the invention is not impaired.

  Further, the average molecular weight of the thermoplastic polymer B of the present invention is not particularly limited, but the number average molecular weight is 2000 from the viewpoint of excellent kneading with the thermoplastic polymer A, shape retention and rigidity in the fiber. It is preferably -10000000, more preferably 5000 to 5000000, and even more preferably 10000 to 1000000.

  The addition amount of the thermoplastic polymer B of the present invention is not particularly limited, but the content is 1 to 30% by weight in terms of excellent light shielding properties and light weight of the obtained fiber. Is more preferable, 1 to 20% by weight is more preferable, and 1 to 15% by weight is even more preferable.

  Moreover, you may mix | blend polymers other than the thermoplastic polymer A and the thermoplastic polymer B to the lightweight blend fiber excellent in the light-shielding property in this invention in the range which does not inhibit the effect of this invention.

Although the relationship between the critical surface tension γ _cA of the thermoplastic polymer A of the present invention and the critical surface tension γ _cB of the thermoplastic polymer B is not particularly limited, the lightness of the resulting fiber is excellent. In this respect, it is preferable that γ _cA −γ _cB ≧ 10 dyn / cm. The critical surface tension relationship γ _cA -γ _cB is more preferably 13 dyn / cm or more, and even more preferably 15 dyn / cm or more, because the larger the value γ _cA -γ _{cB, the} more easily the voids are expressed and the lightness is superior. .

The combination of thermoplastic polymer A and thermoplastic polymer B satisfying γ _cA −γ _cB ≧ 10 dyn / cm, which is preferable in the present invention, is not particularly limited, but includes, for example, polyethylene terephthalate and polypropylene terephthalate. The combination of the polyester to be thermoplastic polymer A and the thermoplastic polymer B to be polyolefin such as polyethylene, polypropylene, polymethylpentene, polyolefin having a cyclic structure, or polyamide such as nylon 6 or nylon 66 is thermoplastic. Examples of the polymer A include a combination of the above-described polyolefin as the thermoplastic polymer B, and polyethylene terephthalate or polypropylene terephthalate as the thermoplastic polymer A. The combination of a polyolefin having a Jo structure thermoplastic polymer B is more preferred.

In addition, the thermoplastic polymer B of the present invention is a light-weight blend fiber obtained by the method of the present invention, and is easily peeled off at the interface between the thermoplastic polymer A and the thermoplastic polymer B, resulting in a blend. The critical surface tension γ _cB of the thermoplastic polymer B is preferably 10 to 35 dyn / cm, and more preferably 10 to 30 dyn / cm, in that the fiber is more lightweight. As the thermoplastic polymer B satisfying the range of the critical surface tension γ _cB , among the polyolefins composed of the above-mentioned olefin monomers or other ethylenically unsaturated compounds, a polyolefin having propylene and / or methylpentene and / or a cyclic structure Is preferably a homopolymer or copolymer occupying 80 mol% or more, more preferably a homopolymer or copolymer occupying 80 mol% or more of methylpentene, and void formation in a combination of polyester as thermoplastic polymer A It is very excellent and very preferable. In particular, in the case of a homopolymer or copolymer in which the above-mentioned propylene accounts for 80 mol% or more, 29-30 dyn / cm, and in the case of a homopolymer or copolymer in which methylpentene accounts for 80 mol% or more, 24-25 dyn / cm, in the case of a homopolymer or copolymer in which the polyolefin having a cyclic structure accounts for 80 mol% or more, it is 30 to 32 dyn / cm.

Although the thermoplastic polymer A and the thermoplastic polymer B of the present invention are not particularly limited, the relationship between the glass transition temperature T _gA of the thermoplastic polymer A and the glass transition temperature T _gB of the thermoplastic polymer B is T _gB. It is preferable that −T _gA ≧ 10 ° C. When the relationship between the glass transition temperatures satisfies T _gB −T _gA ≧ 10 ° C., the thermoplastic polymer A existing in the thermoplastic polymer A is not easily deformed in the stretching step, so that the thermoplastic polymer A and the thermoplastic polymer It is preferable because the composite interface of B is easy to peel off and the thermoplastic polymer B is cracked and divided so that voids are generated in the fiber and the void expression is high. And although the relationship of the glass transition temperature is not particularly limited, it is preferable that T _gB −T _gA ≧ 20 ° C. in that the lightweight property of the lightweight blend fiber obtained by the method of the present invention is good. Even more preferably, T _gB −T _gA ≧ 30 ° C. Further, the thermoplastic polymer A is not particularly limited, but the heat resistance of the lightweight blend fiber obtained by the method of the present invention is good, that is, the thermoplastic polymer A is deformed at high temperatures and the voids are crushed. T _gA is preferably 40 ° C. or higher, more preferably 50 ° C. or higher, and even more preferably 60 ° C. or higher. Although the thermoplastic polymer B is not particularly limited, the lightweight blend fiber has good heat resistance, that is, the thermoplastic polymer in the voids even when the fiber obtained by the method of the present invention is exposed to high temperature. T _gB is preferably 70 ° C. or higher, more preferably 100 ° C. or higher, and even more preferably 130 ° C. or higher, in order to avoid B being deformed and filling the voids. .

The combination of the thermoplastic polymer A and the thermoplastic polymer B satisfying T _gb -T _ga ≧ 10 ° C., which is preferable in the present invention, is not particularly limited. For example, polyethylene terephthalate, polypropylene terephthalate, polylactic acid Polyesters such as Nylon, polyamides such as Nylon 6 and Nylon 66 are thermoplastic polymers A, polystyrene, polymethacryl methacrylate, polycarbonates, polyolefins having a cyclic structure, and polyphenylene ethers are thermoplastic polymers B. Polyethylene terephthalate, nylon 6 and nylon 66 are thermoplastic polymers A, and polystyrene and cyclic structures are used in terms of higher process stability during stretching and higher void formation. Olefins, combinations of polyphenylene ether and a thermoplastic polymer B is more preferred.

Although the thermoplastic polymer A and the thermoplastic polymer B of the present invention are not particularly limited, the relationship between the melting point T _mA of the thermoplastic polymer A and the melting point T _mB of the thermoplastic polymer B is T _mA > T _mB Is preferred. When the relationship between the melting points satisfies T _mA > T _mB , the thermoplastic polymer B is preferable because it is easy to finely disperse in the thermoplastic polymer A and the void developability becomes high. And although the thermoplastic polymer A of the present invention is not particularly limited, the heat resistance of the lightweight blended fiber obtained by the method of the present invention is good, that is, the thermoplastic polymer A is deformed at high temperatures and the voids are crushed. In order to avoid this, the melting point T _mA of the thermoplastic polymer A is preferably 160 ° C. or higher, more preferably 210 ° C. or higher, and even more preferably 250 ° C. or higher. Further, the thermoplastic polymer B of the present invention has good heat resistance of the light blend fiber, that is, even when the fiber obtained by the method of the present invention is exposed to high temperature, the thermoplastic polymer B is deformed in the void and the void is formed. In view of avoiding filling, the thermoplastic polymer B has a melting point T _mB of preferably 150 ° C. or higher, and more preferably 180 ° C. or higher.

The melt viscosity of the thermoplastic polymer B of 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 100,000 poise at the melt spinning temperature of the polyester used is usually used. , Preferably 100 to 50000 poise.

  The method for adding the thermoplastic polymer B to the thermoplastic polymer A in the present invention is not particularly limited. For example, (A) in the polymerization reaction of the thermoplastic polymer A, the polymerization reaction of the thermoplastic polymer A A method of adding at an arbitrary stage before stopping, (B) a method of adding thermoplastic polymer B at the time of spinning thermoplastic polymer A, and melt-kneading under normal pressure or reduced pressure by a kneader such as an extruder or static mixer, (C ) In a normal polymerization reaction of thermoplastic polymer A, thermoplastic polymer B is added at a high concentration, and thermoplastic polymer A to which thermoplastic polymer B is not added is simultaneously added and diluted by a kneader such as an extruder or a static mixer. A method of melt kneading under normal pressure or reduced pressure, (D) adding thermoplastic polymer B to thermoplastic polymer A Thermoplastic polymer A in which thermoplastic polymer B is not added by kneader such as extruder or static mixer during spinning of thermoplastic polymer A after melt-kneading at high concentration under normal pressure or reduced pressure by kneading machine such as a strainer or static mixer Are simultaneously added and diluted, and melt-kneaded under normal pressure or reduced pressure. (E) The thermoplastic polymer B melt is discharged from a nozzle-like tube or the like at any stage prior to discharge in spinning of the thermoplastic polymer A. Examples of the method include discharging, blending by melt shearing in a polymer flow path, and incorporating the thermoplastic polymer A into the thermoplastic polymer A. Preferably, the above-described method (B), (C), or (D) is employed. .

  The lightweight blend fiber excellent in light-shielding property in the present invention is a blend fiber composed of a thermoplastic polymer A and a thermoplastic polymer B. The blended fiber is a fiber formed from a blend composition in which the thermoplastic polymer A and the thermoplastic polymer B are kneaded (blended) at any stage before melt spinning is completed by various methods as described above. In the single fiber cross section perpendicular to the fiber axis direction of the blended fiber, the thermoplastic polymer A has a sea, and the thermoplastic polymer B has a sea-island structure in which two or more islands are formed. And the thermoplastic polymer B which is an island exists discontinuously in the fiber axis direction. Here, it is possible to confirm that the islands are discontinuously dispersed in the fiber axis direction by Example G described later, and the fiber axes are usually at arbitrary intervals at least 10,000 times the single fiber diameter. When cross-sectional observation perpendicular to the direction is performed at a plurality of locations, it is assumed that the sea-island structures of the single-fiber cross-sections are discontinuous. The blended fiber according to the present invention has a core-sheath composite spinning in which one island is continuously formed in the same shape in the fiber axis direction, and a plurality of islands are formed in the same shape in the fiber axis direction. It is essentially different from composite spun fibers obtained from Umijima composite spinning. The composite spun fiber has a very small composite interface area compared to the lightweight blend fiber of the present invention, and voids are not generated at the interface between the sea and the island, or almost no voids are formed and the light weight is poor. However, in the blended fiber of the present invention, when the thermoplastic polymer A forms the sea and the thermoplastic polymer B forms the island, the area of the composite interface between the sea component and the island component in the fiber becomes very large. By the illustrated spinning method, the sea-island interface is peeled off, and a large number of fine voids are developed, and the light-absorbing effect of the contained light-shielding agent results in a blended fiber having excellent light-shielding properties and light weight.

  Moreover, although the average value of the diameter in the single fiber cross section of the island which consists of the thermoplastic polymer B in the lightweight blend fiber excellent in the light-shielding property of this invention is not specifically limited, as mentioned above, the thermoplastic polymer A and thermoplasticity The average dispersion diameter is preferably 5 μm or less because the area of the interface with the polymer B is very large, the voids are fine and very large, and the light shielding property and light weight are very excellent. When the average dispersion diameter is 5 μm or less, the generated voids are not excessively large and are not likely to be a fiber defect. Therefore, the residual elongation and strength are not deteriorated, and are excellent. The average dispersion diameter is more preferably 0.02 to 5 μm, even more preferably 0.03 to 3 μm from the viewpoint that denser and finer voids are expressed and the lightness and fiber properties are homogenized. 0.05 to 1 μm is particularly preferable. The distribution of the dispersed diameter in the cross section of the single fiber is not particularly limited, but a more uniform void is formed inside the fiber, and as a result, the dispersed fiber diameter can be maintained 0. The island component of 0.01 to 0.8 μm is preferably 70% or more, more preferably 80% or more, and still more preferably 90% or more with respect to the total number of island components. Further, the ratio (D / d) between the average dispersion diameter (d) and the diameter of the single fiber cross section (D; in other words, the single fiber diameter) is not particularly limited, but more voids are formed or In terms of excellent fiber properties, D / d is preferably 2 or more, more preferably 4 or more, and even more preferably 10 or more.

  The lightweight blended fiber excellent in light-shielding property of the present invention needs to have a large number of fine voids. For the first time, the blended fiber of the present invention has excellent light-shielding properties and lightness because it has a large number of fine voids, and since the voids are fine, defects in the fiber structure are unlikely to occur and the fiber properties are also excellent. . Further, since the thermoplastic polymer B is present in the voids, the fibers are not easily crushed by an external force, and when the blended fibers are used for various purposes, excellent light shielding properties and light weight are maintained. Here, having a large number of fine voids is defined as the presence of 100 or more voids in all the cross sections in the void observation in the fiber cross section to be described later, and the single fiber cross section photograph observed by the method of Example H below Can be confirmed. When the number of the gaps is 100 or less, the gaps are crushed by an external force in processing steps such as stretching and false twisting, which is not preferable because sufficient light shielding properties and light weight properties are not exhibited. Although not particularly limited, the number of voids present in the cross section of the fiber is preferably 300 or more, more preferably 1000 or more in terms of more excellent light shielding properties and uniform fiber properties. It is even more preferable that the number is 10,000 or more. The upper limit of the number of voids is not particularly limited, but is preferably about 1000000. FIG. 1 illustrates a schematic diagram of the single-fiber cross-sectional photograph. Needless to say, the lightweight blended fiber having excellent light-shielding properties of the present invention is not limited to the cross-sectional photograph.

  Although the lightweight blend fiber excellent in light-shielding property of the present invention is not particularly limited, it is preferable that the fine voids are discontinuous in the fiber axis direction in that the fine voids are not easily crushed by an external force. The discontinuity of the fine voids can be confirmed by a single fiber cross-sectional photograph and a vertical cross-sectional photograph observed by the method of Example H below.

  In addition, the light-weight blend fiber excellent in light-shielding property of the present invention is not particularly limited, but it is more excellent in light-shielding property and the voids are less likely to be crushed. The value is preferably from 0.01 to 1 μm, more preferably from 0.02 to 0.9 μm, and even more preferably from 0.03 to 0.8 μm. The average value of the diameter of the fine voids is calculated from the area value of each void obtained by image processing of the diameter of each void from the single fiber cross-sectional photograph observed by the method of Example H below, and the diameter is calculated from the cross-section of the single fiber By dividing by the total number of voids present in the inside, the average value of the diameters was obtained.

  The distribution of the dispersed diameter in the cross section of the single fiber is not particularly limited, but the diameter is 0 in that a uniform void can be generated inside the fiber and as a result, uniform fiber properties can be maintained. The fine voids of 0.01 to 0.8 μm are preferably 70% or more with respect to the total number of fine voids, more preferably 80% or more, and even more preferably 90% or more.

  The porosity indicating the proportion of voids in the blended fiber of the present invention is not particularly limited, but the lightweight blended fiber excellent in light-shielding properties of the present invention is more lightweight in terms of porosity. Is preferably 15% or more, and more preferably 25% or more. Here, the porosity indicates the apparent specific gravity of the fiber in Example F. below. It is the value calculated by measuring by the method.

The lightweight blended fiber excellent in light-shielding property of the present invention needs to have a boiling water shrinkage of 2 to 30%. Here, the boiling water shrinkage is the value in Example K.I. It is a value measured by the method of (1) and calculated by the following formula (1).
(1) S = (1−L / L ₀ ) × 100
S: Boiling water shrinkage (%)
L ₀ : Skein of drawn yarn, original length of skein measured with initial load of 0.09 cN / dtex L: Treat skein measured with L ₀ in boiling water for 15 minutes under substantially no load, and air dry The skein length measured under an initial load of 0.09 cN / dtex after the boiling water shrinkage rate of 2 to 30% is excellent in form stability and weather resistance, and when used as a fabric for clothing, such as texture processing and dyeing processing are high. It has excellent heat shrinkage characteristics that are excellent in the next processing passability or that are suitably employed in various usage environments in various industrial materials. When the boiling water shrinkage rate is less than 2%, when used as a cloth for clothing, it is not preferable because high-order processing represented by texture processing that imparts a swelling feeling utilizing heat shrinkage cannot be performed. Further, when the boiling water shrinkage is 30% or more, the shape stability is poor, particularly when used as various industrial materials, constantly used at high temperatures, and even when used as clothing, for example, scouring after weaving, In the usual process such as pre-setting, dyeing, and final setting, the fiber is excessively heat-shrinked and cannot keep its shape, and is not preferable because it has poor processability. It is more preferably 3 to 20% in terms of more excellent shape stability, and even more preferably 5 to 15%.

  It is preferable that the lightweight blend fiber excellent in light-shielding property of the present invention contains a compatibilizing agent. The compatibilizing agent in the present invention is expressed by blending the thermoplastic polymer B by changing the interaction at the composite interface when blending the thermoplastic polymer B with the thermoplastic polymer A to enhance the compatibility between the two. It is a compound that reduces the size of the domain. 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 thermoplastic polymer A and the thermoplastic polymer B, for example, a polystyrene polymer, Polyacrylate 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) copolymer, poly (vinyl acetate-styrene) copolymer such as vinyl polymer or copolymer, ionomer, polysaccharide with improved heat resistance and melt plasticity by chemically modifying the side chain moiety, polyalkylene oxide or Copolymers of alkylene oxides and vinyl derivatives, such as poly (alkylene oxide-ethylene) copolymers, poly (alkylene oxide-propylene) copolymers, or derivatives of polyalkylene oxides, copolymers of alkylene terephthalate and alkylene glycol, alkylene terephthalate and poly (alkylene oxide) ) Polymers such as copolymers of glycol, copolymers of alkylene terephthalate and polyalkylene diol, and the like. Among them, polystyrene polymer, polyacrylate polymer, polymethacrylate polymer, alkylene terephthalate and alkylene are advantageous in that they have a large effect as a compatibilizing agent and good yarn physical properties when the fiber of the present invention is formed. Preferred are copolymers of 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. Needless to say, the compatibilizer in the present invention is not limited thereto.

  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 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 (1) can be used.
− [(CH ₂ ) _a —O] _m − (1)
Examples of satisfying the formula (1) 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 (2).
_{- {[(CH 2) a} -O] m - [(CH 2) b -O] n} x - ··· (2)
As satisfying the formula (2), 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 (1) or (2) may be used alone or in a range that does not impair the gist of the invention. You may use what combined the seed | species or more.

  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 examples.

  The content of the compatibilizing agent in the light blend fiber excellent in light-shielding property of the present invention is that the compatibilization is expressed more effectively, and the resulting fiber property of the light blend fiber excellent in light-shielding property is excellent. Thus, the content of the compatibilizer is preferably 1 to 500% by weight, more preferably 2 to 250% by weight with respect to the thermoplastic polymer B.

  As a method for adding a compatibilizing agent in the light-weight blend fiber excellent in light-shielding property of the present invention, it is a method in which it is added to the blend composition of the thermoplastic polymer A and the thermoplastic polymer B at an arbitrary stage before the completion of melt spinning. There is no particular limitation as long as it is present. For example, (A) a method of adding and melting and kneading at an arbitrary stage before the polymerization reaction is stopped in a normal polymerization reaction of thermoplastic polymer A, (B) prepared in advance A method in which a compatibilizing agent is added to the blended composition of the thermoplastic polymer A and the thermoplastic polymer B, and the mixture is melt-kneaded under normal pressure or reduced pressure using a kneader such as an extruder or static mixer. (C) Add a specified amount of compatibilizer, thermoplastic polymer A and thermoplastic polymer B to a kneader such as a static mixer at the same time, Properly the method of melt-kneading under reduced pressure, and the like, but are not particularly limited, a method of the aforementioned in terms of operability (B) or (C) is preferably employed.

  The fiber diameter of the light-weight blend fiber excellent in light-shielding property in the present invention is not particularly limited, but the fiber diameter is excellent in terms of fiber physical properties or in improving processability in forming a fiber product. It is preferable that it is 0.01-5000 micrometers, More preferably, it is 0.01-1000 micrometers or less, and it is still more preferable that it is 0.01-200 micrometers or less. In addition, the cross-sectional shape of the fiber is not particularly limited, and examples thereof include a round shape, a polygonal shape, a multi-leaf shape, and a hollow shape, but a round shape is preferable in that the fiber has stable physical properties, or In terms of improving whiteness and lightness, a multileaf type or a hollow type is preferable. Although not particularly limited, as a hollow mold, hollow fibers can be obtained by forming a spinning discharge hole into a discharge shape that can be formed, for example, as a C shape or a well shape, or by using a reagent. Examples include a method in which a core-sheath fiber is obtained using a component that can be eluted as a core component, and then a hollow fiber is obtained by eluting the core component. In addition, the number of single fibers in one yarn is not particularly limited, and may be set as appropriate according to the purpose of use such as clothing or industrial materials. For example, one monofilament or 2 A multifilament composed of a plurality of yarns may be used. In particular, in the case of multifilaments, it is preferably 2 to 2000, and more preferably 4 to 500, taking into consideration the spinning performance in the spinning or drawing process and the process passability in higher processing. Preferably, it is more preferably 4 to 250.

  The lightweight blend fiber excellent in light-shielding properties of the present invention needs to have a residual elongation of 5% to 50%. Here, the residual elongation refers to the residual elongation of the blend fiber in the present invention. It is the value measured by the method. The residual elongation of 5% to 50% is an optimum residual elongation region having appropriate stretchability in various usage environments for various materials for clothing or industrial use, and the blend fiber in the present invention is a residual elongation of the region. It is a very excellent blend fiber that can be applied as a wide variety of fiber products for the first time by having the above-mentioned heat shrinkage characteristics and having the light weight and light shielding effect of the present invention. is there. If the residual elongation is less than 5%, yarn breakage is likely to occur in the weaving process or sewing process, and the processability is poor, and the resulting fiber product has a very hard texture and its use is limited. It is not preferable. On the other hand, if the residual elongation is 50% or more, the resulting fiber is easily stretched by an external force and has a low strength, so that the shape stability is poor and it is difficult to withstand practical use.

  The lightweight blend fiber in the present invention is excellent in light shielding properties. The light transmittance is preferably 10% or less in the entire wavelength range of 0.36 to 0.74 μm in the ultraviolet, visible, and infrared wavelength regions, and is preferably 8% or less in terms of more excellent light shielding properties. Is more preferable, and it is still more preferable that it is 6% or less. Here, the light transmittance is the spectral transmittance of the fabric using the fiber of the present invention, as shown in Example D. below. It is the value obtained by measuring by the method. Since the lightweight blended fiber is excellent in light-shielding and see-through properties, it is used as a light-shielding material for light-shielding curtains, blinds, etc. as well as uniforms such as lab coats, underwear and sportswear, outdoor clothing, and summer clothing. It can be used suitably.

  The lightweight blend fiber excellent in light-shielding property in the present invention is excellent in lightness. Here, being excellent in lightness means that the specific gravity is smaller than that of a normal fiber having no voids, and means that the specific gravity is 1.30 or less. When used as clothing for infants or elderly people, as well as when used as sportswear or outdoor clothing, the apparent specific gravity of the fiber is small, and it is very favorable characteristics that it has an equivalent bulk (volume) and excellent lightness. Become. Furthermore, when considering the case of using as an industrial material, the weight is reduced when the equivalent strength is assumed, so it is very preferable for transportation. Conversely, when the weight is equivalent, the strength is higher. It is very excellent because it can form a material having. And although the light blend fiber excellent in such light-shielding property is not particularly limited, the apparent specific gravity is preferably 1.0 or less, more preferably 0.95 or less, in terms of more lightweight. 0.90 or less is even more preferable, and 0.85 or less is particularly preferable.

  In the present invention, the strength of the light-weight blend fiber having excellent light shielding properties is preferably 4.0 cN / dtex or more. Of course, when used as clothing for infants or elderly people, as well as when used as sports uniforms or outdoor clothing, and when used as an industrial material, it should be a durable material. There is. Moreover, even when the workability of fibers or fiber products is taken into consideration, the yarn physical properties are required to have high strength. And the intensity | strength of this lightweight blend fiber excellent in light-shielding property is preferably 4.3 cN / dtex or more, more preferably 4.5 cN / dtex or more, and even more preferably 4.8 cN / dtex or more. preferable.

  The light-weight blend fiber excellent in light-shielding property of the present invention may retain 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.

  The method for expressing the voids of the light-weight blend fiber excellent in light-shielding property of the present invention is not particularly limited. For example, any method can be used as long as it can apply stress and express the voids. Examples of the obtained undrawn yarn at a high magnification, a method of continuously drawing at a high magnification without winding up the undrawn yarn at the time of spinning, a method of taking up at a high speed in spinning, etc. Examples include a method of shrinking the thermoplastic polymer B in the lightweight blend fiber excellent in light-shielding properties by heating the yarn or irradiating specific light, and any method can be adopted, but the process is simple and In terms of easy control of void formation, a method of drawing undrawn yarn obtained by winding into a spinning at a high magnification, or continuously without winding up the undrawn yarn during spinning. A method of stretching at a rate is preferable.

  Although there is no particular limitation on the means for producing the light-weight blended fiber excellent in light-shielding property of the present invention, more specific preferred methods are exemplified below.

  The light blend fiber excellent in light-shielding property of the present invention has the advantage that the process is very simple, the productivity is excellent, and the cross-sectional shape of the fiber can be freely controlled. preferable. In melt spinning, the blended spun yarn discharged from the die hole is preferably taken at a take-up speed of 100 to 10000 m / min, preferably 110 to 4000 m / min, more preferably 120 to 3000 m / min, and even more preferably 130 to 2500 m. / Min, particularly preferably with a take-up speed of 140 to 2000 m / min.

After taking up, it is preferable that the film is drawn without being taken up or once taken up and then heated or heated. Preferably, the blend yarn is heated or cooled to a glass transition temperature (T _gA ) of the thermoplastic polymer A + 100 ° C. or less, more preferably to a temperature range of T _gA −80 ° C. to T _gA + 80 ° C. Preferably, it is stretched at a draw ratio of 1.5 times or more, more preferably at a ratio of at least the natural draw ratio to a ratio at which the residual elongation of the drawn yarn becomes 5 to 50%, even more preferably at a ratio of at least the natural draw ratio. The yarn is drawn to a magnification at which the residual elongation of the yarn is 10 to 45%.

A method of heat treatment at a temperature of T _gA + 10 ° C. or higher after stretching is preferred, and a method of stretching at a magnification of 1.1 times or more after heat treatment is more preferred. In other words, the voids become larger by stretching at a high magnification, and the blended fiber obtained by the present invention is extremely excellent in light weight. Moreover, the circumference | surroundings of the space | gap expressed by heat-processing after extending | stretching are heat-set, and the lightweight property excellent in heat resistance can be provided. Here, it is preferable that the heat treatment performed after stretching is performed at a temperature lower than the melting point of the thermoplastic polymer B so that the developed voids are not crushed.

  There is no particular limitation on the method of heating the blended spun yarn at the time of stretching, or the heat treatment method after stretching, which is preferred in the above, and the heated pin-shaped material, roller-shaped material, plate-shaped material, or It is possible to employ a method such as contact-type heating using a heating liquid, or non-contact-type heating using heating gas or heating steam. In particular, regarding the heating method at the time of drawing, since it is preferable to draw at the same time that the fiber deformation temperature is reached in heating, a heated pin-like product, plate-like product, or heating liquid with higher heating efficiency is used. It is preferable to use a conventional contact-type heating method, and it is more preferable to use a heated pin-like object or plate-like object in terms of easy temperature control. Regarding the heat treatment method after stretching, it is preferable to use a contact-type heating method using a heated pin-like material, a roller-like material, a plate-like material, or a heated liquid because it can be uniformly heat-treated.

  The above-mentioned blended yarn is not particularly limited, and after being drawn by melt spinning, it is not wound up, or after being wound up, without being stretched as it is, or after being stretched and false twisted. Also good. In the false twisting process, when a drawn fiber is used, the blended fiber is heated by a contact type or non-contact type method, and false twisted by a disk-shaped object, a belt-shaped object, or a pin-shaped object. When undrawn yarn is used, it is similarly falsely twisted with a disk-like material, a pin-like material, or a belt-like material after being heated by a contact-type or non-contact-type heater or the like while being drawn. Processed. Although the false twisted blend fiber can be wound as it is, it is preferably wound after being heat set.

  The light-weight blend fiber excellent in light-shielding property of the present invention may have effects such as hygroscopicity, water absorption, and heat retention due to the synergistic effect of the voids formed in the fiber, the light hiding agent, and the compatibilizing agent. good. For example, with respect to hygroscopicity, when a light blend fiber excellent in light-shielding property of the present invention is used as a textile product for clothing, it is possible to obtain a more comfortable wearing feeling without stickiness when worn. The value of the hygroscopicity index (ΔMR), which is an index of hygroscopicity of the lightweight blended fiber excellent in light-shielding properties of the invention, is preferably 0.10% or more, and more preferably 0.20% or more. Specifically, ΔMR is a value obtained by subtracting the moisture absorption rate (MR1) at 20 ° C. and 65% RH from the moisture absorption rate (MR2) at 30 ° C. and 90% RH (ΔMR (%) = MR2). -MR1). ΔMR is a driving force for obtaining comfort by releasing moisture in the clothes to the outside air when wearing the clothes. The temperature in the clothes when performing light to moderate work or exercise is 30 ° C, 90% This is represented by RH, the outside air temperature is represented by 20 ° C. and 65% RH, and the difference between the two is taken. In the present invention, this ΔMR is used as an index of the hygroscopic evaluation, and the larger ΔMR corresponds to the higher moisture absorption / release capability and the better comfort when worn.

  The light blend fiber excellent in light-shielding property of the present invention is very useful as a fiber itself because it is excellent in light-shielding property and light weight, and the fiber can be used as it is. You may use for a part or all. Textile products in which the light-weight blended fiber of the present invention is used in part or in whole include fabrics such as taffeta, twill, satin, desine, palace, and georgette, flat knitting, rubber knitting, double knitting, single tricot knitting, Shows knitted fabrics such as half-tricot knitted fabrics, chemical bond methods, thermal bond methods, needle punch methods, water jet punch (spun lace) methods, stitch bond methods, felt methods, nonwoven fabrics, ropes, etc. There are no particular restrictions on the form of fibers such as raw yarn, twisted yarn, and processed yarn. Of course, if it is a woven or knitted fabric, it may be processed by conventional scouring, dyeing, heat setting, etc., or if it is a non-woven fabric, it may be a glazing press, embossing press, compact processing, flexible processing, heat setting, etc. Chemical processing such as physical processing, bonding processing, laminating processing, coating processing, antifouling processing, water repellent processing, antistatic processing, flameproofing processing, insectproof processing, sanitary processing, foam resin processing, etc. In addition, application processing such as microwave application, ultrasonic application, far-infrared application, ultraviolet application, and low-temperature plasma application may be performed, and the final form may be sewn as clothing.

  In addition, the fiber product in which the blend fiber of the present invention is used in part is a lightweight blend fiber excellent in light-shielding property of the present invention and a synthetic fiber different from the present invention, a semi-synthetic fiber, a natural fiber, such as cellulose fiber, It is a mixed fiber product characterized by using at least one kind of fiber selected from wool, silk, stretch fiber, and acetate fiber. Specific examples include cellulose fibers such as natural fibers such as cotton and hemp, steel ammonia rayon, rayon, polynosic, etc., and the content of lightweight blended fibers excellent in light-shielding properties mixed with these cellulose fibers. Although there is no restriction | limiting in particular, In order to make use of the lightweight property of the lightweight blend fiber of this invention which is taking advantage of the feel of a cellulose fiber, moisture absorption, water absorption, antistatic property, and excellent in the light-shielding property of this invention, 25 to 75% is preferable. In addition, the existing wool and silk used in blended fiber products can be used as they are, and the content of these wool or lightweight blended fibers with excellent light-shielding properties mixed with silk is the texture, warmth, and bulkiness of the wool. Moreover, in order to make use of the lightness of the light-weight blended fiber, which makes use of silk texture and squeak noise and is excellent in light-shielding property of the present invention, 25 to 75% is preferable. In addition, the stretch fiber used in the mixed fiber product is not particularly limited. Polyester represented by dry-spun or melt-spun polyurethane fiber, polybutylene terephthalate fiber, and polytetramethylene glycol copolymer polybutylene terephthalate fiber. In the mixed fiber product using stretch fibers, the content of the lightweight blend fiber is preferably about 60 to 98%. When the content of the light-weight blend fiber exceeds 70%, the stretchability can be suppressed, so that it can be used for outer and casual wear applications. If it is less than 70%, it can be used for innerwear, foundation, swimwear, etc. due to its stretchability. The acetate fiber used for the mixed fiber product is not particularly limited, and may be a diacetate fiber or a triacetate fiber. The content of the light-weight blend fiber to be mixed with these acetate fibers is preferably 25 to 75% in order to make use of the texture, sharpness, and gloss of the acetate fiber and make use of the light-weight property of the light-weight blend fiber of the present invention.

  In these various mixed fiber products, the form of the light blend fiber of the present invention and the mixing method are not particularly limited, and known methods can be used. For example, the blending method includes woven fabrics such as unwoven fabrics and reversible fabrics used for warp or weft yarns, knitted fabrics such as tricot and russell, etc. In addition, twisting, synthesizing yarn, blending, and entanglement may be performed.

  The fiber product of the present invention may be dyed including mixed fiber products. For example, it is preferable to take a process of scouring, presetting, dyeing and final setting by a conventional method after weaving and weaving. Further, if necessary, it is also preferable to carry out an alkali reduction treatment by a conventional method after scouring and before dyeing. The scouring is preferably performed in a temperature range of 40 to 98 ° C. In particular, in the case of mixed use with stretch fibers, it is more preferable to refine the fiber products while relaxing the fiber products because the elasticity is improved. One or both of the heat sets before and after dyeing can be omitted, but both are preferably performed in order to improve the form stability and dyeability of the textile. The heat setting temperature is 120 to 190 ° C., preferably 140 to 180 ° C., and the heat setting time is 10 seconds to 5 minutes, preferably 20 seconds to 3 minutes.

  The light-weight blend fiber excellent in light-shielding property of the present invention is excellent in light-shielding property and lightness, and therefore may be used for a part or all of sports clothing. Sports clothing is clothing that is worn on the body during sports competitions, specifically golf wear, gateball, baseball, tennis, soccer, table tennis, volleyball, basketball, rugby, American football, hockey, athletics. , Clothing and uniforms such as triathlon, speed skating, ice hockey, etc., or outdoor sports applications such as shoes, bags, supporters, socks, and mountaineering. The sports clothing is preferably a lightweight material in that it can reduce energy consumption, and it is a very preferable characteristic that it has a high light-shielding property even if it is thin in outdoor sports where it is exposed to sunlight for a long time. In addition, the blended fiber of the present invention is preferable because it has many discontinuous fine voids in the fiber axis direction and can also have heat retention properties to reduce the cold in winter. Moreover, since the lightweight blend fiber of this invention can also be made into 4.0 cN / dtex or more about a fiber physical property, even if a load is applied to a fiber by excessive exercise | movement, it is hard to fracture | rupture, and it is used suitably also as sports clothing. Although not particularly limited, since sports clothing often touches the skin directly, it is preferable to make the cross-sectional shape of the blended fiber of the present invention an uneven shape in terms of suppressing stickiness when sweating. . The uneven cross-sectional shape includes, for example, cross-sectional shapes such as C, E, F, H, I, K, L, M, N, S, T, W, X, Y, Z, +, and π shapes. Fiber is preferably used. The blended fiber of the present invention is not particularly limited except for the shape of the fiber as described above. However, the blended fiber of the present invention has a heat retaining effect, cushioning property, and water absorption, and thus has a crimped false twisted yarn. A processed yarn or a spun yarn is more preferable.

  The fabric structure of the sports apparel using the blend fiber of the present invention is not particularly limited, and may be a knitted structure or a woven structure, and a conventionally known structure can be used. A knitted structure is preferred from the standpoint of maintaining heat retention. Examples of the knitting structure include a flat knitting, a rubber knitting, a double-sided knitting, a single tricot knitting, and a half tricot knitting, and may be appropriately selected according to the intended use.

  The sports apparel in which the blended fiber of the present invention is partially used is a sports apparel characterized by using a light blended fiber excellent in light-shielding property of the present invention and a fiber different from the present invention. The fiber to be mixed and the method for mixing are not particularly limited, and conventionally known fibers and methods can be used.

  The light-weight blend fiber excellent in light-shielding property of the present invention is excellent in light-shielding property and lightness, and may be used for a part or all of uniform clothing. Specifically, white clothes, surgical clothes, inspection clothes, work clothes, uniforms, etc. can be mentioned, and it is preferable that the material is lightweight in terms of reducing energy consumption. Especially when used as white clothes such as white clothes, light shielding. It is very preferable because it is highly transparent, and even if it is thin, sufficient anti-slipping properties are exhibited. Further, the uniform garment is required to have a clean feeling, and in particular, washing durability is required. However, since the microscopic voids discontinuous in the fiber axis direction in the blended fiber of the present invention include the thermoplastic polymer B in each void. It is preferable because the gap is not crushed after washing and the light shielding property and light weight are not impaired. Furthermore, since the residual elongation is 5 to 50%, it has moderate stretchability, and the fiber physical property can be 4.0 cN / dtex or more, so it is difficult to break even if the fiber is loaded by excessive motion. After all it is suitably used as uniform clothing. Moreover, although it does not restrict | limit in particular, the uniform using the blend fiber of this invention may give post-processes, such as a conventionally well-known antimicrobial process, to the fiber surface. The fabric structure of the uniform garment using the blend fiber of the present invention is not particularly limited, and may be a knitted structure or a woven structure, and a conventionally known structure can be used.

  The uniform garment in which the blend fiber of the present invention is used is a uniform garment characterized by using a light blend fiber excellent in light-shielding property of the present invention and a fiber different from the present invention. The fiber to be mixed and the method for mixing are not particularly limited, and conventionally known fibers and methods can be used.

  The light blend fiber excellent in light shielding property of the present invention is excellent in light shielding property and light weight, and therefore may be used for a part or all of the vehicle interior material. Since it is excellent in lightness, it becomes possible to reduce the total weight of the vehicle and to reduce fuel consumption, which is very preferable. In particular, when used as a car seat or a mat, the light blend fiber excellent in light-shielding property of the present invention is preferable because it has many discontinuous voids in the fiber axis direction, and has appropriate cushioning properties and compression recovery properties. Although the vehicle interior material using the blended fiber of the present invention is not particularly limited, it is preferably a pile fabric because it has a higher-class feeling. For example, a tricot raised, double raschel knitting or moquette weave May be selected as appropriate according to the intended use.

  Further, the vehicle interior material partially used with the blend fiber of the present invention is a vehicle interior material characterized by using a light blend fiber excellent in light-shielding property of the present invention and a fiber different from the present invention. . The fiber to be mixed and the method for mixing are not particularly limited, and conventionally known fibers and methods can be used.

  The light-weight blend fiber excellent in light-shielding property of the present invention is excellent in light weight, not only excellent in residual elongation and boiling water shrinkage, but also in strength of 4.0 cN / dtex. Also good. Of course, it can be used as an application that needs to float in water, such as a lifeboat rope, because it has a good fiber physical property and a density of 1.0 or less. Since it can be used for, it is preferable. Since the rope is often used in a tension state, the rope is not particularly limited. However, the elastic modulus of the fiber is preferably 80 cN / dtex or more in that creep deformation hardly occurs, and is 90 cN / dtex. Even more preferably. In addition, the production method of making the rope from the light blend fiber excellent in light-shielding property of the present invention can be made by using a conventionally known method, and the light blend fiber excellent in light-shielding property is combined into a yarn process and a strand process. The obtained strands are netted into ropes using a closer or a knitting machine. Thereafter, a heat treatment step is preferably performed in order to stabilize the shape, quality, and performance. There are various heat treatment methods such as resin processing, steam, hot water, and electric heating. However, since the rope diameter is usually large, it is preferable to use high-frequency radio waves that generate heat from the inside in order to uniformly heat the outside and the inside.

  The twisting method is not particularly limited, but is exemplified in JIS-L2701 (1992), JIS-L2703 (1992), JIS-L2704 (1992), JIS-L2705 (1992), JIS-L2706 (1992) and the like. Such a method can be appropriately selected and used.

  The number of twists is not particularly limited, but usually, for example, the number of lower twists is 30 to 500 times / m, preferably 50 to 300 times / m, and the number of upper twists is about 20 to 200 times / m, 20 to 100 times / m. Is more preferable.

  Further, the rope partially using the light-weight blend fiber having excellent light-shielding property of the present invention is a rope containing the blend fiber of the present invention in at least a part of the fibers constituting the rope, and is not particularly limited. For example, a rope mixed with the blended fiber of the present invention and a high-strength fiber is very preferable because it is excellent in lightness and durability. The high-strength fiber to be mixed is not particularly limited, and conventionally known polyester fiber, polyamide fiber, polyethylene fiber, polypropylene fiber, polyarylate fiber, para- or meta-aramid fiber, polyparaphenylene benzobisoxazole A fiber etc. can be mentioned, If it has high intensity | strength compared with the blend fiber of this invention, it will not restrict | limit in particular. The content of the blended fiber in the rope partially using the blended fiber of the present invention may be selected conveniently according to the purpose of use, and is not particularly limited, but is lightweight, strong and durable. The content is preferably 25 to 98%, more preferably 50 to 95%, from the viewpoint of excellent balance in properties.

  The rope structure may be a structure suitable for the application. For example, twisted rope such as three-punch, four-punch, six-punch, and eight-punch, braided rope and braid such as stone-punch, twill-punch, twelve-pipe, and sixteen-punch, or hammered-out, rock yarn, and longline A specially structured rope is possible. However, in order to make the best use of the high strength and high elasticity of the fiber, it is preferable to select one having a small number of twists.

  Moreover, the rope using the light blend fiber excellent in light-shielding property of the present invention or the rope using other fiber is used as a core member, and the outer periphery is spirally formed, for example, by crossing the yarn or strand of the other fiber or the blend fiber of the present invention. A double structure (double blade structure) covered with a sheath member may be formed by winding, and a rope having a multilayer structure may be configured by repeating this. In addition, in the case of such a multi-layered rope, heat treatment is performed after the rope is constructed, and the core member becomes difficult to move when the fibers or strands are fused together, and the fiber is used even in applications where tension relaxation is repeated. It is preferable because fatigue due to inter-wearing hardly occurs and the durability of the rope is improved.

  As a use of the rope using the light blended fiber excellent in light-shielding property of the present invention in part or in whole, it is used for balloons, ad balloon mooring, leisure, mountain climbing, making use of the light weight and excellent fiber properties of the blended fiber. Not only can it be used for various purposes such as ropes, cargo handling ropes, lifting ropes, safety nets, etc., but it can also have a specific gravity of 1.0 or less, and maintains stable fiber properties even in wet conditions. It is particularly suitable for applications that require water floating, such as lifeboat ropes.

  Since the lightweight blended fiber excellent in light shielding property of the present invention is excellent in light shielding property and light weight, it may be used for a part or all of the tent fabric. Because it is excellent in light-shielding properties, it can block sunlight from entering the tent during the day and block UV rays that adversely affect the body, and at night the light does not leak outside the tent. Particularly, it is very preferable in that it is difficult to be detected by an external enemy when used for military use. Moreover, since it is excellent in lightweight property, when using it for the outdoors, mountain climbing, a hiking, and a military use, since the energy required for a movement can be reduced, it is very preferable. As for the method for producing a tent using the blended fiber of the present invention, a conventionally known method can be applied, and if necessary, it can be mixed with other fibers and the tent base fabric can be replaced with a black pigment. Coloring is also preferable in terms of improving the light shielding property. Although it does not specifically limit about this pigment, The pigment | dye of 1 type selected from a carbon black pigment, an aniline black pigment, an iron oxide black pigment etc., or a mixture of 2 or more types of pigment | dye is mentioned, It is commercially available. Can be used. The application method is not particularly limited, and a conventionally known padding method, coating method, printing method, or the like can be applied. After applying the pigment, it is also preferable to perform a drying heat treatment by an ordinary method. The amount of the pigment to be attached may be appropriately selected so as not to impair the lightness of the tent, but about 1 to 5 wt% with respect to the fiber weight is appropriate. In addition, although not particularly limited, in order to prevent inconveniences such as raindrops entering the tent and generation of mold in the tent, a water repellent treatment with a water repellent is also preferable. Can be used. The water repellent process may be performed before or after the previous pigment application process and simultaneously. Furthermore, it is also a preferable means to coat each processing agent with a vinyl chloride resin or the like so that the processing agent does not fall off the fabric after various processing. In addition, the tent fabric using a light blended fiber excellent in light-shielding property of the present invention as a part thereof is composed of a light-blended fiber excellent in light-shielding property of the present invention and synthetic fibers, semi-synthetic fibers, natural fibers, etc. different from the present invention This is a tent fabric characterized by using at least one selected fiber, and can take advantage of the light-shielding property and light weight of the blended fiber of the present invention, and can also impart superior properties. Although not particularly limited, for example, a tent fabric mixed with the blended fiber of the present invention and a high-strength fiber is very preferable because it is excellent in light-shielding property and light weight and excellent in tensile strength and tear strength. . The high-strength fiber to be mixed is not particularly limited, and conventionally known polyester fiber, polyamide fiber, polyethylene fiber, polypropylene fiber, polyarylate fiber, para- or meta-aramid fiber, polyparaphenylene benzobisoxazole A fiber etc. can be mentioned, If it has high intensity | strength compared with the blend fiber of this invention, it will not restrict | limit in particular. The content of the blended fiber in the tent fabric partially using the blended fiber of the present invention may be selected conveniently according to the purpose of use, and is not particularly limited, but is lightweight, strong and durable. The content is preferably 25 to 98%, more preferably 50 to 95%, from the viewpoint of excellent balance in properties.

  EXAMPLES Hereinafter, the present invention will be described specifically and in detail with reference to examples, but 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 Intrinsic Viscosity (IV) A sample was dissolved in an orthochlorophenol solution and measured at 25 ° C. using an Ostwald viscometer.

B. Measurement of critical surface tension In a film made of thermoplastic polymer A or thermoplastic polymer B having a thickness of 50 μm or more, pure water 72.8 dyne / cm, ethyl alcohol (special grade or higher) 22.3 dyne / cm, dioxane 33.6 dyne / cm, 20 ° C. using all liquids of an organic solvent or an aqueous solution having a surface tension of benzene 28.9 dyne / cm, hexane 18.4 dyne / cm, 20% aqueous ammonia 59.3 dyne / cm, nitrobenzene 43.4 dyne / cm, When a droplet is placed on a solid and the droplet is stationary under conditions of humidity 40 to 80% and standing still, the surface of the solid 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). G) The critical surface tension γ _c was obtained by extrapolating the points where the surface tension when completely wetted, that is, when cos θ = 1, was plotted.

C. Measurement of glass transition temperature (T _g ) and melting point (T _m ) Using a differential scanning calorimeter (DSC-2) manufactured by PerkinElmer Co., Ltd., vacuum-dried 10 mg of a chip at a vacuum degree of 133 Pa or less for 12 hours. The sample obtained by filling the bread making was measured at a heating rate of 16 ° C./min. T _m and T _g are defined as follows: after observing the endothermic peak temperature (T _m1 ) observed once at a heating rate of 16 ° C./min, holding at a temperature of T _m1 + 20 ° C. for 5 minutes, (The quenching time and room temperature holding time are combined for 5 minutes), and the endothermic peak temperature observed as a step-like baseline deviation is measured as T _g when measured again at a temperature rise condition of 16 ° C./min. The endothermic peak temperature observed as the melting temperature of the crystal was defined as T _m .

D. Measurement of transmittance The drawn yarn obtained so that the fineness of the multifilament becomes 111 dtex is combined or separated, and the multifilament is used, and the gauge width is 20 / inch (2.54 cm) and the pitch length is 1 mm. A cylindrical knitted fabric is prepared, and eight 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. Spectral transmittance characteristics in the wavelength region of 0.36 to 0.74 μm with respect to the standard white plate of the 8-layer fabric sample were measured in the transmittance measurement mode of the spectrocolorimeter (CM-3700d manufactured by Minolta Co., Ltd.). It was measured. In each sample, the maximum spectral transmittance in the wavelength region was determined from the spectral transmittance characteristics obtained by averaging the results of three measurements at one measurement location and three measurements at different measurement locations.

E. Measurement of strength, residual elongation, and setting of natural draw ratio Tensilon tensile tester (TENSIRON UCT-100) manufactured by Orientec Co., Ltd. is used, if it is an undrawn yarn, the initial sample length is 50 mm and the drawn speed is 400 mm / min. Then, the strength and residual elongation were measured at an initial sample length of 200 mm and a tensile speed of 200 mm / min, respectively, and the average value measured five times was used as each measured value. Further, the natural draw ratio is obtained by dividing the elongation (%) at which the constant stress elongation region is completed by 100 in the stress-strain curve obtained when measuring the strength and elongation of the undrawn yarn. The value obtained by adding 1 was taken as the natural stretch ratio.

F. Measurement of Apparent Specific Gravity of Fiber and Thermoplastic Polymer and Calculation of Porosity The apparent specific gravity of the fiber was determined by JIS-L-1013: 1999 8.17.1 (published by the Japanese Standards Association, chemical fiber filament yarn test method). Based on the flotation method, at a temperature of 20 ° C. ± 5 ° C., the solvent is NaBr aqueous solution if the specific gravity is 1 or more, and if the specific gravity is between 1 and 0.789, the aqueous solution is ethyl alcohol. If it is between 0.789 and 0.659, using an ethyl alcohol-hexane solution, a liquid having a specific gravity in which the yarn does not float or sink for 24 hours is prepared and measured, and an average of five specific gravity values measured The value was defined as a measured specific gravity value (Q). The following formula was used for calculation of the porosity of the fiber.
Porosity (%) = 100 (1-Q / R)
_{R = 100 / (S 1 /} V 1 + S 2 / V 2 + S 3 / V 3 + (100-S 1 -S 2 -S 3) / Vp)
However,
S ₁ : Addition amount of thermoplastic polymer B (% by weight)
S ₂ : Addition amount of light masking agent (% by weight)
S ₃ : Amount of compatibilizer added (% by weight)
V ₁ : Density of thermoplastic polymer B (g / cm ³ )
V ₂ : density of light hiding agent (g / cm ³ )
V ₃ : density of compatibilizer (g / cm ³ )
Vp: density of thermoplastic polymer A (g / cm ³ )
For the density, a value measured based on the density gradient tube method defined in JIS-L-1013 is used. For example, when the thermoplastic polymer A is polyethylene terephthalate, 1.34 if the undrawn yarn, For drawn yarn, 1.38 was used. For example, when the thermoplastic polymer A is nylon 6, 1.13 was used for undrawn yarn, and 1.138 was used for drawn yarn.
R: Apparent specific gravity of lightweight blend fiber excellent in light-shielding property when there is no void G. Confirmation of incompatibility and discontinuity of thermoplastic polymer B Blocks with embedded fibers in epoxy resin are subjected to metal dyeing as necessary, and cut in a direction perpendicular to the fiber axis with an ultramicrotome to cross single fibers An ultra-thin section of the surface is prepared, and cross-sectional observation is performed at an accelerating voltage of 75 kV and an arbitrary magnification of 5,000 to 1,000,000 times with a transmission electron microscope (TEM) and an observation apparatus (H-7100FA type manufactured by Hitachi, Ltd.). The photos obtained were digitized. The cross-sectional photograph was image analyzed by WinROOF (version 2.3) manufactured by Mitani Corp., a computer software, to confirm the incompatibility and discontinuity of the thermoplastic polymer B. About incompatibility, the area of all the thermoplastic polymers B which existed on a cross-sectional photograph was calculated, respectively, and it evaluated by the average value of the diameter of the thermoplastic polymer B calculated by judging that it was substantially circular from this area value. Further, regarding the discontinuity of the thermoplastic polymer B, 10 cross-sectional photographs were taken at arbitrary intervals of at least 10,000 times the single fiber diameter, and the average value and distribution of the diameter of the thermoplastic polymer B depend on the cut surface location. When different, it was determined to be discontinuous. The case of being discontinuous was evaluated as ◯, and the case of no continuous or thermoplastic polymer B being evaluated as ×.

  H. Confirmation of single fiber diameter, number of fine voids, void diameter, discontinuity.

A single fiber is placed on the carbon tape affixed to the sample stage, and after platinum deposition (deposition film pressure: 25 to 50 Å, treatment time: about 120 seconds), focused ion beam (FIB) cutting-scanning With a scanning electron microscope (SEM) observation device (STRAIDB235 manufactured by FEI), rough cutting (current: about 7000 pA, processing time: about 20 minutes) and precision cutting (with a Ga focused ion beam accelerated at an acceleration voltage of 30 kV) (Current: about 3000 pA, treatment time: about 4 minutes) In an atmosphere with a vacuum of 1.4 × 10 ⁻¹³ Pa, the specimen is perpendicular to the fiber axis direction when observing a single fiber cross section. In the case of cutting and observing the single fiber longitudinal section, the sample was cut in parallel to the fiber axis direction with a length of 5 times or more the single fiber diameter. After cutting, using a scanning electron microscope possessed by the apparatus, in an atmosphere with a vacuum degree of 1.4 × 10 ⁻¹⁹ Pa, with a sample inclination of 52 degrees and an acceleration voltage of 5 kV, a magnification of 200 to 100,000 The single fiber transverse section and the single fiber longitudinal section were observed at an arbitrary magnification of twice. Here, 10 cross-sectional and vertical cross-sections were digitally photographed at arbitrary intervals of at least 10,000 times the single fiber diameter, and image analysis was performed by image analysis using WinROOF (version 2.3) manufactured by Mitani Corporation of computer software. The number, the diameter of the void, and the discontinuity of the void were confirmed. The number of voids was calculated by averaging the number of all voids present on each cross-sectional photograph. As for the diameter of the void, the area of all voids existing on each cross-sectional photograph was calculated, and the diameter of the void was calculated by judging that the area was substantially circular from the area value. The diameter was averaged by dividing the diameter by the total number of voids present in the single fiber cross section. Further, the discontinuity of the voids was confirmed by the fact that the number of voids in each cross section did not match and that there were voids that were interrupted in the fiber axis direction in at least one longitudinal section photograph. Evaluation was made as ○ when the gap was discontinuous in the fiber axis direction, and x when the gap was continuous or not.

I. Evaluation of stretchability Regarding the stretchability in the stretching process, when 1 kg of unstretched yarn is stretched, it is evaluated by the number of times that single yarn breakage occurs and the single yarn is wound around the stretching roller. X (impossible) when the yarn is wound, △ (inferior) when the single yarn is wound 10 times or more and 19 times or less, ○ (good) when the number of times the single yarn is wound is 4 times or more and 9 times or less, The number of times the yarn was wound was evaluated as a double circle (excellent) when it was 3 times or less.

Polymer adjustment 1
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, 0.03 part by weight of 85% phosphoric acid aqueous solution as a coloring inhibitor and antimony trioxide as a polycondensation catalyst The polycondensation reaction was performed by adding 0.06 parts by weight of cobalt acetate tetrahydrate as a toning agent to obtain a commonly used polyethylene terephthalate having an IV of 0.70.

Polymer adjustment 2
In the preparation 1 of the polymer, an anatase-type titanium dioxide having an average particle size of 0.3 μm and a specific gravity of 3.9 g / cc is 10% by weight with respect to the obtained polyethylene terephthalate when performing a normal esterification reaction. And a polycondensation reaction was performed in the same manner as in Preparation 1 of the polymer to obtain polyethylene terephthalate having an IV of 0.70.

Polymer adjustment 3
In the preparation 1 of the polymer, calcite-type calcium carbonate having an average particle diameter of 0.6 μm and a specific gravity of 2.6 g / cc is 10% by weight with respect to the obtained polyethylene terephthalate when performing a normal esterification reaction. After the addition, a low polymer was obtained, and a polycondensation reaction was carried out in the same manner as in Preparation 1 of the polymer to obtain polyethylene terephthalate having an IV of 0.70.

Reference Example Using the polyester obtained in Polymer Preparation 1, using a biaxial extruder type melt spinning machine, melt spinning using a die having a spinning temperature of 290 ° C., a hole diameter of 0.3 mm, and a number of holes of 24. And a polyester multifilament fiber having a round shape of 292 dtex-24 filaments was obtained. No yarn breakage occurred during spinning, and the yarn making property was good.

When the obtained polyester fiber is stretched, the yarn feeding speed of the yarn feeding roller is 100 m / min, and a stretching rate is set using a hot plate at 100 ° C. as a heat source for stretching between the first roller and the second roller. Was stretched by 3.5 times, the second roller was heat-treated at 150 ° C., and then the yarn was cooled to T _g of polyester or less with a cold roller and wound up. No thread breakage occurred during drawing, and the drawability was excellent.

  The obtained drawn yarn had a residual elongation of 38.5% and a boiling water shrinkage of 9.7%, and was excellent in high-order processing passability, but had a maximum spectral transmittance of 18.7% and a specific gravity. It was 1.37, and the light shielding property and lightness were low. The results of the reference example are shown in Table 1, and a schematic diagram of a single fiber cross section is shown in FIG.

Comparative Example 1
A hopper is filled with a polyester prepared by polymer preparation 1 and polymer preparation 2 which is dry blended in a chip state so as to contain 0.3% by weight of titanium dioxide with respect to the total weight of the resulting blended fiber. In the same manner as above, melt spinning was performed to obtain a polyester multifilament fiber having a round cross section of 292 dtex-24 filaments. No yarn breakage occurred during spinning, and the yarn making property was good.

  About the obtained polyester fiber, it extended | stretched by the method similar to a reference example. No thread breakage occurred during drawing, and the drawability was excellent.

  The obtained drawn yarn had a residual elongation of 38.2% and a boiling water shrinkage of 9.6%, and was excellent in stretchability and high-order processing passability, but the maximum spectral transmittance was 16.7. %, And the specific gravity was 1.37, which was inferior in light-shielding property and lightness as compared with Examples described later. The results of Comparative Example 1 are shown in Table 1, and a schematic diagram of a single fiber cross section is shown in FIG.

Comparative Example 2
A hopper is filled with a polyester prepared by polymer preparation 1 and polymer preparation 2 which is dry blended in a chip state so as to contain 3.5% by weight of titanium dioxide with respect to the total weight of the resulting blended fiber. In the same manner as in No. 1, melt spinning was performed to obtain a polyester multifilament fiber of 292 dtex-24 filaments having a round cross-sectional shape. No yarn breakage occurred during spinning, and the yarn making property was good.

  About the obtained polyester fiber, it extended | stretched by the method similar to a reference example. No thread breakage occurred during drawing, and the drawability was excellent.

  The obtained drawn yarn had a residual elongation of 37.9% and a boiling water shrinkage of 9.6%, and was excellent in stretchability and high-order processing passability, but the maximum spectral transmittance was 15.3. %, And the specific gravity was 1.37, which was inferior in light-shielding property and lightness as compared with Examples described later. The results of Comparative Example 2 are shown in Table 1, and a schematic diagram of a single fiber cross section is shown in FIG.

Comparative Example 3
A polyester prepared in Polymer Preparation 1 and Polymer Adjustment 3 was dry-blended in a chip state so as to contain 2.4% by weight of calcium carbonate based on the total weight of the resulting blended fiber, and filled in a hopper. In the same manner as in No. 1, melt spinning was performed to obtain a polyester multifilament fiber of 292 dtex-24 filaments having a round cross-sectional shape. No yarn breakage occurred during spinning, and the yarn making property was good.

  About the obtained polyester fiber, it extended | stretched by the method similar to a reference example. No thread breakage occurred during drawing, and the drawability was excellent.

  The obtained drawn yarn had a residual elongation of 38.1% and a boiling water shrinkage of 8.7%, and was excellent in stretchability and high-order processing passability, but the maximum spectral transmittance was 15.8. %, And the specific gravity was 1.37, which was inferior in light-shielding property and lightness as compared with Examples described later. The results of Comparative Example 3 are shown in Table 1, and a schematic diagram of a single fiber cross section is shown in FIG.

Example 1
The polyester prepared in Polymer Preparation 1 and Polymer Preparation 2 was dry blended in the form of a chip so as to contain 0.3% by weight of titanium dioxide with respect to the total weight of the resulting blend fiber, and filled in a hopper. When performing melt spinning using an extruder type melt spinning machine, as the thermoplastic polymer B, polymethylpentene (TPX, type RT18, specific gravity 0.83 g / cc, critical surface tension of about 24 dyn / cm, manufactured by Mitsui Chemicals, Inc. , T _g 25 ° C., hereinafter abbreviated as PMP), 8% by weight is added to the total weight of the blended fiber, and melt spinning is performed in the same manner as in the reference example. The film was stretched at.

  The obtained drawn yarn has a residual elongation of 38.1%, a boiling water shrinkage of 9.2%, excellent stretchability and high-passability, a maximum spectral transmittance of 7.5%, and a specific gravity of 0. The fiber was as small as .97 and was excellent in light-proofing and lightness. Further, the strength of the obtained fiber, and the yarn forming property and stretchability were also good. The results of Example 1 are shown in Table 1, and a schematic diagram of a single fiber cross section is shown in FIG.

Example 2
Except that the draw ratio in Example 1 was changed to 3.2 times, melt spinning was carried out in the same manner as in Example 1 for drawing.

  The obtained drawn yarn has a residual elongation of 49.4% and a boiling water shrinkage of 10.9%, which is excellent in stretchability and high-order processing passability, and has a maximum spectral transmittance of 10.0%. The specific gravity was 0.99, and the fiber was excellent in light-shielding properties and lightness. In addition, the strength of the obtained fiber, the yarn-forming property, and the stretchability were also good. The results of Example 2 are shown in Table 1, and a schematic diagram of a single fiber cross section is shown in FIG.

Comparative Example 4
Except that the draw ratio in Example 1 was set to 2.8, melt spinning was carried out in the same manner as in Example 1 for drawing.
The obtained drawn yarn had a maximum spectral transmittance of 15.6%, a specific gravity of 1.20, a light-shielding property and lightness that were inferior to those of Examples, and a residual elongation of 93. It was a fiber that did not retain a practical shape retention ability because it was .5% and the strength was low, so that it was easily deformed by tensile elongation. The results of Comparative Example 4 are shown in Table 1, and a schematic diagram of a single fiber cross section is shown in FIG.

Comparative Example 5
When melt spinning using a biaxial extruder type melt spinning machine using the polyester obtained in Polymer Preparation 1, the same PMP as in Example 1 was added and melt spinning was performed in the same manner as in the Reference Example. In the same manner as in the reference example, stretching was performed at a magnification of 3.5 times.
The obtained drawn yarn has a residual elongation of 37.4%, a boiling water shrinkage of 9.3%, excellent stretchability and high-order processing passability, and good strength, yarn-forming property, and drawability. Although it is a fiber having a specific gravity of 0.98 and very excellent in lightness, it has a lower light blocking property than that of Example 1 because it does not hold a light shielding agent. The results of Comparative Example 5 are shown in Table 2, and a schematic diagram of a single fiber cross section is shown in FIG.

Comparative Example 6
In Comparative Example 5, melt spinning and stretching were performed in the same manner as in Comparative Example 5 except that the stretching ratio was 4.5 times.

  About the lightness of the obtained drawn yarn, the light shielding property was the same as in Example 1, but the yarn breakage or single yarn winding around the roller occurred during drawing, and in addition, the drawability was inferior, The residual elongation was extremely low at 4.2%, and the fiber was inferior in high-order processability. The results of Comparative Example 6 are shown in Table 2, and a schematic diagram of a single fiber cross section is shown in FIG.

Example 3
The polyester prepared in Polymer Preparation 1 and Polymer Adjustment 2 was dry-blended in a chip state so as to contain 3.5% by weight of titanium dioxide with respect to the total weight of the resulting blended fiber, and charged into a hopper. When melt spinning using an extruder-type melt spinning machine, the same PMP as in Example 1 was added, melt spinning was performed in the same manner as in the reference example, and stretching was performed at a magnification of 3.5 times in the same manner as in the reference example. went.

  The obtained drawn yarn has a residual elongation of 38.0%, a boiling water shrinkage of 8.3%, excellent stretchability and high-passability, 9.3% of maximum spectral transmittance, and specific gravity of 1 In addition to .04, the fiber was excellent in light-shielding property and lightness, and was also good in fiber physical properties such as strength, yarn forming property and stretchability. Compared with Example 3, Example 1 was superior in lightness, and the fiber was made more excellent in lightness by optimizing the amount of light-shielding agent added. The results of Example 3 are shown in Table 2, and a schematic diagram of a single fiber cross section is shown in FIG.

Comparative Example 7
The polyester prepared in Polymer Preparation 1 and Polymer Preparation 2 was dry blended in the form of a chip so as to contain 0.3% by weight of titanium dioxide with respect to the total weight of the resulting blend fiber, and filled in a hopper. When melt spinning using an extruder type melt spinning machine, melt spinning is performed in the same manner as in the reference example except that a 24-hole hollow fiber forming die having a C-shaped die hole shape is used. In the same manner, stretching was performed at a magnification of 3.5 times.

  The obtained drawn yarn has a residual elongation of 36.5%, a boiling water shrinkage of 15.2%, excellent stretchability and high-passability, and has a hollow portion. Although the fiber had good properties, the yarn-forming property or stretchability was frequently broken, and the hollow portion was crushed by an external force. Therefore, the lightness was also lower than that of Example 1. The results of Comparative Example 7 are shown in Table 2, and a schematic diagram of a single fiber cross section is shown in FIG.

Comparative Example 8
When melt spinning using a twin-screw extruder type melt spinning machine, the polyester of the polymer preparation 1 and the polymer preparation 2 should contain 0.3% by weight of titanium dioxide with respect to the total weight of the resulting blended fibers. A hot-water soluble copolymer polyethylene terephthalate obtained by dry blending in a chip state as a sea component in composite spinning and copolymerizing 20 mol% of isophthalic acid and 15 mol% of a sodium sulfonate derivative of isophthalic acid. (Hereinafter, abbreviated as hot water-soluble PET) was used as an island component in composite spinning, and sea-island composite spinning was performed so that sea: island = 65: 35 and the number of islands was 32, and the others were the same as in the reference example. A polyester composite multifilament fiber having a round cross section of 292 dtex-24 filaments was obtained under spinning conditions. No yarn breakage occurred during spinning, and the yarn making property was excellent.

  Using the fiber obtained by spinning, stretching was performed at a magnification of 3.5 times in the same manner as in the reference example. 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 yarn was immersed in hot water at 90 ° C. for 60 minutes to completely remove the copolymer PET on the island, and then a hollow fiber having 32 hollow portions continuous in the fiber axis direction for each single fiber was obtained. The obtained hollow fiber had a specific gravity of 0.90 and a residual elongation of 38.5%, which was excellent in lightness and residual elongation of the fiber, but because of the hot water treatment, the boiling water shrinkage was 0.00. The fiber was extremely low at 4%, and could not be subjected to high-order processing that gave the fiber a swell, and because of its low strength, the fiber was inferior in high-order processing passability. Further, since the hollow portion was continuous in the fiber axis direction, the hollow portion was easily crushed, and the light shielding property was inferior to that of the example. The results of Comparative Example 8 are shown in Table 2, and a schematic diagram of a single fiber cross section is shown in FIG.

Comparative Example 9
The polyester prepared in Polymer Preparation 1 and Polymer Preparation 2 was dry blended in the form of a chip so as to contain 0.3% by weight of titanium dioxide with respect to the total weight of the resulting blend fiber, and filled in a hopper. When performing melt spinning using an extruder type melt spinning machine, as the thermoplastic polymer B, a styrene maleimide resin (MSN, average molecular weight of about 110,000, specific gravity of 1.18 g / cc, critical surface, manufactured by Denki Kagaku Kogyo Co., Ltd.) tension about _{39dyn / cm, T g 206 ℃} , hereinafter MSN abbreviated) was added 10 wt% with respect to blend fibers to the total weight obtained was subjected to melt spinning in the same manner as in reference example, the 292dtex-24 filaments, A multifilament fiber having a round cross-sectional shape was obtained. No yarn breakage occurred during spinning, and the yarn making property was good.

  Although an attempt was made to draw at a magnification of 3.5 times using the fiber obtained by spinning in the same manner as in the reference example, a yarn breakage or a single yarn winding around a roller occurred during the drawing, and the draw ratio was 3 In addition to being inferior in drawability, it was inferior in lightness and only a fiber having a low residual elongation could be obtained. Further, the light-shielding property of the obtained drawn yarn was also inferior to that of the example. The results of Comparative Example 9 are shown in Table 2. As can be seen from the schematic diagram of the cross section of the single fiber shown in FIG. 14, the use of MSN as the thermoplastic polymer B was inferior in void formation compared to the examples.

Example 4
In Example 1, an ordinary pressure melter type melt spinning machine was used as the melt spinning machine to be used, and the melt spinning machine was kneaded in the polymer flow path until it was discharged from the spinneret (the mixer was placed in the polymer flow path). And the like, and the melt spinning is performed under the same conditions as in Example 1, and the blend contains 0.3% by weight of titanium dioxide and 8% by weight of PMP with respect to the total weight of the blend fiber. After obtaining the fiber, it was stretched at a magnification of 3.5 times in the same manner as in the reference example.

  Table 2 shows the results of fiber properties such as strength and specific gravity of the obtained drawn yarn. Although the yarn-making property and stretchability were lower than those of Example 1, it had excellent fiber properties such as a residual elongation of 30.9% and a boiling water shrinkage of 9.9%. It was a good fiber. Further, from the schematic diagram of the cross section of the single fiber shown in FIG. 15, the average dispersion diameter of PMP was larger than that of Example 1 and exceeded 5 μm. In other words, the light-weight blended fiber in the present invention has a structure in which the thermoplastic polymer B is finely dispersed, so that the light shielding property or the lightness is excellent. The results of Example 4 are shown in Table 2.

Reference Example 5
The polyester prepared in Polymer Preparation 1 and Polymer Adjustment 3 was dry-blended in a chip state so as to contain 2.4% by weight of calcium carbonate with respect to the total weight of the resulting blended fiber, and filled in a hopper. When melt spinning using an extruder-type melt spinning machine, the same PMP as in Example 1 was added, melt spinning was performed in the same manner as in the reference example, and stretching was performed at a magnification of 3.5 times in the same manner as in the reference example. went.

The obtained drawn yarn has a residual elongation of 38.5% and a boiling water shrinkage of 8.9%, is excellent in stretchability and high-passability, has a maximum spectral transmittance of 7.2%, and a specific gravity of 0.7. In addition to 98, the fiber was excellent in light-shielding properties and lightness, and was also good in strength, yarn-making property and stretchability. The results of Reference Example 5 are shown in Table 3, and a schematic diagram of a single fiber cross section is shown in FIG.

Example 6
The polyester prepared in Polymer Preparation 1 and Polymer Adjustment 2 was dry blended in the form of a chip so as to contain 0.3% by weight of titanium oxide with respect to the total weight of the resulting blended fiber, and charged into a hopper. When performing melt spinning using an extruder type melt spinning machine, as the thermoplastic polymer B, norbornene-based resin (ARTON grade F5023, specific gravity 1.08 g / cc, critical surface tension about 32 dyn / cm, T _g 166 ° C. (hereinafter abbreviated as ARTON) to obtain 8% by weight based on the total weight of the blended fiber, melt spinning as in the reference example, and stretching at a magnification of 4.5 times as in the reference example Went.

  The obtained drawn yarn has a residual elongation of 38.3% and a boiling water shrinkage of 9.1%, is excellent in stretchability and high-passability, has a maximum light transmittance of 4.2%, and a specific gravity of 0.2. In addition to 85, the fiber was remarkably excellent in light-shielding properties and lightness, and was also excellent in strength, yarn-forming property and stretchability. The results of Example 6 are shown in Table 3, and a schematic diagram of a single fiber cross section is shown in FIG.

Example 7
The polyester prepared in Polymer Preparation 1 and Polymer Adjustment 2 was dry blended in the form of a chip so as to contain 0.3% by weight of titanium oxide with respect to the total weight of the resulting blended fiber, and charged into a hopper. When performing melt spinning using an extruder type melt spinning machine, as the thermoplastic polymer B, a modified polyphenylene ether resin (Iupiace grade AH90, specific gravity 1.07 g / cc, manufactured by Mitsubishi Engineering Plastics Co., Ltd., critical surface tension of about 47 dyn / cm, T _g 172 ° C., hereinafter abbreviated as PPE), and 10% by weight is added to the total weight of the blended fiber, and melt spinning is performed in the same manner as in the reference example. The film was stretched 5 times.

  The obtained drawn yarn has a residual elongation of 38.4% and a boiling water shrinkage of 7.8%, is excellent in stretchability and high-passability, has a maximum light transmittance of 4.2%, and a specific gravity of 0.2. In addition to 98, the fiber was excellent in light-shielding properties and lightness, in particular, it was excellent in light-shielding properties in the ultraviolet region, and was excellent in strength, yarn-forming properties, and stretchability. The results of Example 7 are shown in Table 3, and a schematic diagram of a single fiber cross section is shown in FIG.

Example 8
The polyester prepared in Polymer Preparation 1 and Polymer Preparation 2 was dry blended in the form of a chip so as to contain 0.3% by weight of titanium dioxide with respect to the total weight of the resulting blend fiber, and filled in a hopper. When melt spinning using an extruder type melt spinning machine, 8% by weight based on the total weight of the blended fiber from which PMP is obtained as thermoplastic polymer B, and a styrene copolymer manufactured by Nippon Steel Chemical Co., Ltd. (Estyrene MS200, hereinafter abbreviated as “Estyrene”) was added in an amount of 20% by weight with respect to the added amount of PMP, respectively, and melt spinning was performed in the same manner as in the Reference Example. Stretched at a magnification of 0.0.

  The obtained drawn yarn has a residual elongation of 38.0% and a boiling water shrinkage of 8.9%, which is excellent in stretchability and high-order processing passability, a maximum spectral transmittance of 4.8%, and a specific gravity of 0.8. It was 70 and was a fiber that was remarkably excellent in light shielding properties and light weight. Moreover, the fiber physical property of the obtained fiber, the yarn-making property, and the drawability were also excellent. The results of Example 8 are shown in Table 3, and a schematic diagram of a single fiber cross section is shown in FIG.

Example 9
In Example 8, a polypropylene (grade J108M, specific gravity 0.90 g / cc, critical surface tension about 29 dyn / cm, T _g 0 ° C., hereinafter abbreviated as PP) manufactured by Grand Polymer Co., Ltd. can be obtained as the thermoplastic polymer B. 15% by weight based on the total weight of the blended fiber, and a copolymer of ethylene terephthalate and poly (ethylene oxide) glycol (hereinafter referred to as PET-PEG; 10% of poly (ethylene oxide) glycol component) as a compatibilizing agent. Melt spinning and stretching were performed in the same manner as in Example 8 except that 20% by weight of PP was added.

  The obtained drawn yarn has a residual elongation of 37.6% and a boiling water shrinkage of 9.1%, and is excellent in stretchability and high-passability, and has a maximum spectral transmittance of 5.4% and a specific gravity of 0.7. The fiber was as small as 84, and was extremely excellent in light shielding and light weight. Moreover, the fiber physical property of the obtained fiber, the yarn-making property, and the drawability were also excellent. The results of Example 9 are shown in Table 3, and a schematic diagram of a single fiber cross section is shown in FIG.

Example 10
In Example 8, the same method as in Example 8, except that 8% by weight of ARTON as the thermoplastic polymer B and 20% by weight of PET-PEG as the compatibilizing agent were added to the content of ARTON. Melt spinning was performed. Subsequently, the film was stretched at a magnification of 4.7 times in the same manner as in the reference example.

  The obtained drawn yarn has a residual elongation of 38.3% and a boiling water shrinkage of 8.3%, and is excellent in stretchability and high-order processing passability, with a maximum spectral transmittance of 2.1% and a specific gravity of 0.8. The fiber was as small as 73, and was extremely excellent in light shielding and light weight. Further, the obtained fiber had excellent strength, and good spinning properties and stretchability. The results of Example 10 are shown in Table 3, and a schematic diagram of a single fiber cross section is shown in FIG.

Example 11
0.28% by weight, based on the total weight of the blended fiber, using nylon 6 amylan (type CM1017) manufactured by Toray Industries, Inc. as the thermoplastic polymer A, and obtaining the same titanium oxide as the polymer preparation 2 as the light shielding agent. 8% by weight based on the total weight of the blend fiber from which PMP can be obtained as polymer B, and 20% by weight of Toray DuPont's Hytrel (type 4057, hereinafter abbreviated as Hytrel) as thermoplastic compatibilizer. %, And melt spinning was performed in the same manner as in the reference example, and the obtained fiber was stretched by 4.0 times in the same manner as in the reference example. The yarn breakage did not occur during spinning, and the yarn-making property was excellent. During drawing, yarn breakage or winding of a single yarn around a roller did not occur, and the drawability was also excellent.

  The obtained drawn yarn has a residual elongation of 38.1% and a boiling water shrinkage of 12.6%, and is excellent in stretchability and high-passability, and has a maximum spectral transmittance of 5.7% and a specific gravity of 0.7. It is a small fiber of 81, and is a fiber that is remarkably excellent in light-shielding properties and lightness, and has good strength. The results of Example 11 are shown in Table 3, and a schematic diagram of a single fiber cross section is shown in FIG.

Examples 12-15
In Example 8, melt spinning was carried out in the same manner as in Example 8 except that the PMP content was variously changed and that the compatibilizing agent styrene was added in an amount of 40% by weight based on the PMP content. In the same manner as in the reference example, stretching was performed for Examples 12 and 14 at a magnification of 4.0 times, and for Examples 13 and 15 at a magnification of 3.5 times.

As is apparent from Table 4, Examples 14 and 15 were superior to Examples 12 and 13 in light shielding properties and light weight. By incorporating an appropriate amount of the thermoplastic polymer B into the polyester to which the light-screening agent was added, the drawn yarn obtained was more excellent in light-shielding properties and lightness.

Examples 16-19
In Example 10, melt spinning was performed in the same manner as in Example 10 except that the compatibilizer PET-PEG was variously changed with respect to the content of ARTON and was included. Subsequently, the film was stretched at a magnification of 4.7 times in the same manner as in the reference example. As is clear from Table 4, Examples 18 and 19 were superior to Examples 16 and 17 in terms of light shielding properties and light weight. That is, by setting the content of the compatibilizing agent to an appropriate amount, the drawn yarn obtained has a better light shielding property or light weight.

  The light-weight blend fiber excellent in light-shielding property obtained by the present invention has excellent light-shielding property and lightness, has a practically optimum residual elongation, and has a maleimide structure in terms of fiber color ( Since the use of polyester is excluded, there is no concern about the yellowness (yellowing) of the fiber, so there is no limitation on the application when used for clothing, for example. In addition, the physical properties of the fibers can be 4.0 cN / dtex or higher, so uniform clothing such as lab coats, underwear, T-shirts, shirts, swimwear, women's clothing, men's clothing, etc., and light weight for infants and the elderly In addition to being suitably used as clothing, sports clothing such as golf wear, gateball, baseball, tennis, soccer, table tennis, volleyball, basketball, rugby, American football, hockey, athletics, triathlon, speed skating, ice hockey, etc. It can also be suitably used for clothes, uniforms, or outdoor sports applications such as shoes, bags, supporters, socks, and climbing clothes. Furthermore, vehicle interior materials such as carpets and wall materials for automobiles, ships, airplanes, railways, etc., as well as ropes, tents, curtains, blinds, etc., which are required to be lightened due to energy savings as industrial materials. Alternatively, it is also suitably used for materials that require light shielding properties such as packing materials used for various transportations.

Schematic diagram of the cross-sectional structure of a blended fiber excellent in light shielding properties in the present invention Schematic diagram of the cross-sectional structure of the reference example Schematic diagram of the cross-sectional structure of Comparative Example 1 Schematic diagram of the cross-sectional structure of Comparative Example 2 Schematic diagram of the cross-sectional structure of Comparative Example 3 Schematic diagram of the cross-sectional structure of Example 1 Schematic diagram of the cross-sectional structure of Example 2 Schematic diagram of cross-sectional structure of Comparative Example 4 Schematic diagram of cross-sectional structure of Comparative Example 5 Schematic diagram of cross-sectional structure of Comparative Example 6 Schematic diagram of cross-sectional structure of Example 3 Schematic diagram of the cross-sectional structure of Comparative Example 7 Schematic diagram of the cross-sectional structure of Comparative Example 8 Schematic diagram of the cross-sectional structure of Comparative Example 9 Schematic diagram of cross-sectional structure of Example 4 Schematic diagram of cross-sectional structure of Reference Example 5 Schematic diagram of cross-sectional structure of Example 6 Schematic diagram of cross-sectional structure of Example 7 Schematic diagram of cross-sectional structure of Example 8 Schematic diagram of cross-sectional structure of Example 9 Schematic diagram of cross-sectional structure of Example 10 Schematic diagram of cross-sectional structure of Example 11

Explanation of symbols

1: Thermoplastic polymer A
2: Thermoplastic polymer B
3: Light hiding agent 4: Air gap

Claims (20)

A blend fiber in which a main component thermoplastic polymer A having a fiber forming ability, a thermoplastic polymer B having no maleimide structure in the molecular skeleton, and titanium oxide as a light shielding agent are blended, and has many fine voids. A lightweight blended fiber excellent in light-shielding properties, characterized in that the boiling water shrinkage represented by the following formula (1) is 2 to 30% and the residual elongation is 5 to 50%.
(1) S = (1-L / L ₀ ) × 100
S: Boiling water shrinkage (%)
L ₀ : skein of fiber, original length of skein measured at initial load 0.09 cN / dtex L: skein measured at L ₀ was treated in boiling water for 15 minutes under substantially no load, and after air drying Skein length measured under initial load 0.09 cN / dtex The lightweight blend fiber excellent in light-shielding properties according to claim 1, wherein the fine voids are discontinuous in the fiber axis direction. The lightweight blend fiber excellent in light-shielding properties according to claim 1 or 2, wherein there are 300 or more fine voids present in the cross section of the fiber. The light blend fiber excellent in light-shielding property according to any one of claims 1 to 3, wherein the average value of the diameters of the fine voids present in the cross section of the fiber is 0.01 to 1 µm. The lightweight blend fiber excellent in light-shielding property according to any one of claims 1 to 4, wherein the thermoplastic polymer A is a polyester polymer or a polyamide polymer. 6. The light shielding material according to claim 5, wherein the thermoplastic polymer A is a polyester polymer, and a main structure thereof is a polyester comprising at least one repeating unit selected from ethylene terephthalate, butylene terephthalate, and propylene terephthalate. Lightweight blend fiber with excellent properties. The relationship between the critical surface tension γ _cA of the thermoplastic polymer A and the critical surface tension γ _cB of the thermoplastic polymer B is γ _cA −γ _cB ≧ 10 dyn / cm, 7. Lightweight blended fiber with excellent light-shielding properties. The glass transition temperature T _gB of the thermoplastic polymer B and the glass transition temperature T _gA of the thermoplastic polymer A
The light-weight blend fiber excellent in light-shielding property according to any one of claims 1 to 7, wherein the relationship of _TgB - _TgA ≧ 10 ° C. The light blend fiber excellent in light-shielding property according to any one of claims 1 to 8, wherein the content of the light shielding agent is 0.01 to 3% by weight based on the total weight of the blend fiber. The light blend fiber excellent in light-shielding property according to any one of claims 1 to 9, wherein the light transmittance in the entire wavelength range of 0.36 to 0.74 µm is 10% or less. The lightweight blend fiber excellent in light-shielding property according to any one of claims 1 to 10 , wherein the apparent specific gravity of the fiber is 1.0 or less. The lightweight blend fiber excellent in light-shielding property according to any one of claims 1 to 11 , wherein the strength is 4.0 cN / dtex or more. The light-weight blend fiber excellent in light-shielding properties according to any one of claims 1 to 12, wherein the compatibilizer is contained in an amount of 1 to 500% by weight based on the thermoplastic polymer B. The lightweight blended fiber having excellent light shielding properties according to any one of claims 1 to 13 , wherein the content of the thermoplastic polymer B is 1 to 30% by weight based on the total weight of the fiber. 15. A fiber product, characterized in that the light-weight blended fiber having excellent light shielding properties according to any one of claims 1 to 14 is used in part or in whole. A sports apparel comprising a part or all of the light-weight blended fiber having excellent light shielding properties according to any one of claims 1 to 14. The uniform clothing characterized by using the lightweight blend fiber excellent in the light-shielding property of any one of Claims 1-14 for part or all. A vehicle interior material characterized in that the lightweight blended fiber excellent in light-shielding properties according to any one of claims 1 to 14 is used in part or in whole. A rope characterized by using part or all of the light-weight blended fiber having excellent light shielding properties according to any one of claims 1 to 14. A tent fabric characterized in that the light-weight blended fiber having excellent light-shielding properties according to any one of claims 1 to 14 is used in part or in whole.

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