WO2014132895A1

WO2014132895A1 - Spun yarn that contains polymethylpentene fiber, and fiber structure made of same

Info

Publication number: WO2014132895A1
Application number: PCT/JP2014/054195
Authority: WO
Inventors: 鹿野秀和; ▲はま▼中省吾; 荒西義高
Original assignee: 東レ株式会社
Priority date: 2013-02-28
Filing date: 2014-02-21
Publication date: 2014-09-04
Also published as: JP6308127B2; JPWO2014132895A1; TW201443303A

Abstract

The present invention addresses the problem of providing a spun yarn which exhibits excellent lightness, heat retaining properties, rapid drying properties, and heat resistance in ironing and which can be suitably employed as a fiber structure such as a woven, knitted or nonwoven fabric. A spun yarn which contains a polymethylpentene fiber that comprises a polymethylpentene-based resin as a main component and that has a single fiber fineness of 1 to 20dtex and which has a twist coefficient (K) of 1.3 to 6.5 as calculated according to formula (I): K = T ÷ N^1/2 [wherein T is a twist number (twists/25.4mm) and N is an English cotton count].

Description

Spun yarn containing polymethylpentene fiber and fiber structure comprising the same

The present invention relates to a spun yarn comprising polymethylpentene fiber. More specifically, the present invention relates to a spun yarn excellent in heat retention, quick drying, and iron heat resistance as well as light weight.

There has been a demand for woven and knitted fabrics that are lighter and have higher heat retention than before, and various spun yarns have been proposed so far. As a general method for reducing the weight of the spun yarn, formation of a hollow portion or an interfiber gap can be mentioned. Since the hollow portion and the inter-fiber gap contain air, it is possible to develop heat retaining properties in addition to light weight.

Patent Document 1 proposes a spun yarn made of a hollow polyester fiber. In this proposal, the hollow portion imparts lightness and heat retention to the spun yarn.

Patent Document 2 proposes a spun yarn made of a highly shrinkable polyolefin fiber. In this proposal, the fiber is shrunk by heat treatment to form a gap between fibers, thereby imparting light weight to the spun yarn.

Patent Document 3 proposes a spun yarn using split composite fibers composed of two or more thermoplastic resins having low affinity. In this proposal, a low-specific gravity polypropylene and polymethylpentene were combined at a ratio of 1: 1 and then divided to obtain a spun yarn having a single yarn fineness of about 0.2 denier (about 0.22 dtex). It is disclosed.

JP 2007-70768 A Japanese Patent Laid-Open No. 5-44108 JP-A-3-269126

In the method described in Patent Document 1, since the specific gravity of the polyester fiber disclosed in the same document is as high as 1.38, it is necessary to increase the hollow ratio in order to improve the lightness. However, when the hollow ratio is high, cracking and crushing of the hollow portion occurs in the process up to the spun yarn, so there is a limit to imparting light weight.

In the method of Patent Document 2, since the fabric itself contracts, the knitted and knitted fabric structure becomes dense and easily hardens, and the lightness and flexibility are impaired. Moreover, since the polyolefin fiber disclosed by patent document 2 has low melting | fusing point, iron heat resistance is low, and the expansion | deployment use in the general clothing field was restricted.

In the method of Patent Document 3, since the single yarn fineness of the fibers constituting the obtained spun yarn is small, there is a problem that the quality is extremely deteriorated due to generation of fluff and the like.

An object of the present invention is to solve the above-mentioned problems of the prior art, and is excellent in quick drying and iron heat resistance in addition to lightness and heat retention, and can be suitably used as a fiber structure such as woven or knitted fabric. Is to provide.

The problem of the present invention is that the composition component comprises polymethylpentene resin in which 60% by weight or more of the component is a polymethylpentene resin and the single yarn fineness is 2 to 20 dtex, and the number of twists is T (times). /25.4 mm), where N is the English cotton count, the problem can be solved by a spun yarn having a twist coefficient K calculated by the following formula (I) of 1.3 to 6.5.
(I) K = T ÷ N ^1/2
The polymethylpentene fiber may contain a thermoplastic resin different from the polymethylpentene resin in the polymethylpentene resin, and the average fiber length of the polymethylpentene fiber is 10 to 100 mm. It can be suitably employed.

Furthermore, it may be a spun yarn obtained by blending the polymethylpentene fiber and a chemical fiber or a natural fiber. The polymethylpentene fiber is (A), and the chemical fiber or the natural fiber is (B ), The blend ratio (weight ratio) of (A) and (B) is A / B = 85/15 to 97/3, and the apparent specific gravity of the spun yarn is 0.83 to 1.2. It is preferable that the chemical fiber or the natural fiber has a melting point or decomposition temperature of 200 ° C. or higher. It can also be suitably employed that the chemical fiber is a polyester fiber, a polyamide fiber, a polyacrylonitrile fiber, or a cellulose fiber, and that the natural fiber is cotton, silk, hemp, or wool.

The spun yarn containing the polymethylpentene fiber can be suitably used for at least a part of the fiber structure.

According to the present invention, it is possible to provide a spun yarn excellent in heat retention, quick drying property, and iron heat resistance as well as lightness. Further, by using a polymethylpentene fiber containing a thermoplastic resin, it is possible to impart color developability to the spun yarn. The spun yarn obtained by the present invention can be suitably used in a wide range of applications such as general clothing, sports clothing, bedding, interiors, and materials by using a fiber structure such as woven or knitted fabric.

The spun yarn of the present invention comprises polymethylpentene fiber in which 60% by weight or more of the constituent components is a polymethylpentene resin and the single yarn fineness is 2 to 20 dtex, and the number of twists is T (times / 25.4 mm), where the English cotton count is N, the twist coefficient K calculated by the following formula (I) is 1.3 to 6.5.
(I) K = T ÷ N ^1/2
The spun yarn of the present invention contains polymethylpentene fiber. A polymethylpentene resin, which is a kind of polyolefin resin, is excellent in heat retention because of low thermal conductivity, as in the case of other polyolefin resins such as polyethylene and polypropylene, and is excellent in quick drying because of its high hydrophobicity. Furthermore, the polymethylpentene resin has a lower specific gravity than polyethylene and polypropylene and is extremely lightweight. In addition, it has a higher melting point and softening point than other polyolefin-based resins and is excellent in heat resistance, so it can be used for iron and can be used for high-temperature applications in addition to general clothing applications. . Therefore, by including polymethylpentene fiber containing a polymethylpentene resin as a constituent component and satisfying each of the above requirements, a spun yarn excellent in heat retention, quick-drying, and iron heat resistance can be obtained as well as light weight. .

In the present invention, the polymethylpentene fiber in which 60% by weight or more of the constituent component is a polymethylpentene resin means a polymethylpentene fiber containing 60% by weight or more of the polymethylpentene resin in the fiber. . If necessary, the polymethylpentene fiber may contain a thermoplastic resin different from the polymethylpentene resin and various additives in the polymethylpentene resin. The polymethylpentene fiber contains a thermoplastic resin and various additives different from the polymethylpentene resin in the polymethylpentene resin. It shows that a thermoplastic resin different from polymethylpentene resin and various additives are included. Even in such a case, in order not to impair the excellent lightness of the polymethylpentene resin, the polymethylpentene fiber needs to contain 60% by weight or more of the polymethylpentene resin.

Examples of the polymethylpentene resin in the present invention include a 4-methyl-1-pentene polymer, and even if it is a homopolymer of 4-methyl-1-pentene, 4-methyl-1-pentene and others It may be a copolymer with an α-olefin. These other α-olefins (hereinafter sometimes simply referred to as α-olefins) can be copolymerized with one or more.

These α-olefins preferably have 2 to 20 carbon atoms, and the molecular chain of the α-olefin may be linear or branched. Specific examples of these α-olefins include ethylene, propylene, 1-butene, 1-pentene, 1-hexene, 1-octene, 1-decene, 1-dodecene, 1-tetradecene, 1-hexadecene, 1-octadecene, -Eicosene, 3-methyl-1-butene, 3-methyl-1-pentene, 3-ethyl-1-pentene, 3-ethyl-1-hexene and the like.

The copolymerization rate of the α-olefin is preferably 20 mol% or less with respect to the total number of moles of 4-methyl-1-pentene and α-olefin. An α-olefin copolymerization rate of 20 mol% or less is preferred because a spun yarn having good mechanical properties and heat resistance can be obtained. The copolymerization ratio of α-olefin is more preferably 15 mol% or less, and further preferably 10 mol% or less.

The melting point of the polymethylpentene resin in the present invention is preferably 200 to 250 ° C. If the melting point of the polymethylpentene resin is 200 ° C. or higher, the heat resistance of the spun yarn is improved, which is preferable. On the other hand, if the melting point of the polymethylpentene resin is 250 ° C. or lower, it is preferable because the spinning operability is improved when it is combined with the thermoplastic resin by melt spinning. The melting point of the polymethylpentene resin is more preferably 210 to 245 ° C, and further preferably 220 to 240 ° C.

The polymethylpentene resin in the present invention may have been subjected to various modifications by adding secondary additives. Specific examples of secondary additives include plasticizers, ultraviolet absorbers, infrared absorbers, fluorescent brighteners, mold release agents, antibacterial agents, nucleating agents, thermal stabilizers, antioxidants, antistatic agents, coloring Examples include, but are not limited to, inhibitors, modifiers, matting agents, antifoaming agents, preservatives, gelling agents, latexes, fillers, inks, colorants, dyes, pigments, and fragrances. These secondary additives may be used alone or in combination.

The polymethylpentene fiber used in the present invention may contain a thermoplastic resin (hereinafter sometimes simply referred to as a thermoplastic resin) different from the polymethylpentene resin. Since polymethylpentene resin is a resin having high transparency and low refractive index, coloring property can be imparted to the polymethylpentene fiber by dyeing the thermoplastic resin, which is preferable.

The thermoplastic resin in the present invention is not particularly limited and can be suitably used as long as it can be combined with a polymethylpentene resin by melt spinning and dyed with a dye. Specific examples of the thermoplastic resin include, but are not limited to, polyester, polyamide, thermoplastic polyacrylonitrile, thermoplastic polyurethane, modified polyolefin, polyvinyl chloride, and cellulose derivatives. Of these, polyesters and polyamides can be suitably used because they have excellent mechanical properties and good color developability. In addition, only 1 type may be used for a thermoplastic resin and multiple may be used together.

Specific examples of polyester include aromatic polyesters such as polyethylene terephthalate, polypropylene terephthalate, polybutylene terephthalate, polyhexamethylene terephthalate, polylactic acid, polyglycolic acid, polyethylene adipate, polypropylene adipate, polybutylene adipate, polyethylene succinate, polypropylene succinate , Polybutylene succinate, polyethylene sebacate, polypropylene sebacate, polybutylene sebacate, polycaprolactone, and other aliphatic polyesters, copolymer polyesters obtained by copolymerizing these polyesters with copolymer components, and the like. It is not limited. Among them, polylactic acid can be suitably employed because it has a low refractive index and high color developability when dyed.

Specific examples of copolymerized components of polyester include phthalic acid, isophthalic acid, terephthalic acid, 5-sodium sulfoisophthalic acid, 1,5-naphthalenedicarboxylic acid, 2,6-naphthalenedicarboxylic acid, and 2,2′-biphenyldicarboxylic acid. Aromatic dicarboxylic acids such as 3,3'-biphenyldicarboxylic acid, 4,4'-biphenyldicarboxylic acid, anthracene dicarboxylic acid, malonic acid, fumaric acid, maleic acid, succinic acid, itaconic acid, adipic acid, azelaic acid, Sebacic acid, 1,11-undecanedicarboxylic acid, 1,12-dodecanedicarboxylic acid, 1,14-tetradecanedicarboxylic acid, 1,18-octadecanedicarboxylic acid, 1,2-cyclohexanedicarboxylic acid, 1,3-cyclohexanedicarboxylic acid 1,4-cyclohexanedicarboxylic acid Aliphatic dicarboxylic acids such as dimer acid, and aromatic diols such as catechol, naphthalenediol, bisphenol, ethylene glycol, trimethylene glycol, tetramethylene glycol, hexamethylene glycol, diethylene glycol, polyethylene glycol, polypropylene glycol, neopentyl glycol, Examples include aliphatic diols such as cyclohexanedimethanol, but are not limited thereto. These copolymerization components may use only 1 type and may use 2 or more types together.

Specific examples of polyamides include aromatic polyamides such as nylon 6T, nylon 9T, and nylon 10T, aliphatic polyamides such as nylon 4, nylon 6, nylon 11, nylon 12, nylon 46, nylon 410, nylon 66, and nylon 610, and the like. Examples thereof include, but are not limited to, a copolymerized polyamide obtained by copolymerizing a copolymer component with the polyamide.

Specific examples of the copolymerization component of polyamide include aromatic diamines such as metaphenylenediamine, paraphenylenediamine, metaxylylenediamine, paraxylylenediamine, 1,2-ethylenediamine, 1,3-trimethylenediamine, 1,4 -Tetramethylenediamine, 1,5-pentamethylenediamine, 2-methyl-1,5-pentamethylenediamine, 1,6-hexamethylenediamine, 1,7-heptamethylenediamine, 1,8-octamethylenediamine, 1 , 9-nonamethylenediamine, 2-methyl-1,8-octamethylenediamine, 1,10-decamethylenediamine, 1,11-undecamethylenediamine, 1,12-dodecamethylenediamine, 1,13-trideca Methylene diamine, 1,16-hexadecamethylene diamine, , 18-octadecamethylenediamine, 2,2,4-trimethylhexamethylenediamine, piperazine, cyclohexanediamine, and other aliphatic diamines, and phthalic acid, isophthalic acid, terephthalic acid, 5-sodium sulfoisophthalic acid, 1,5 -Aromatic dicarboxylic acids such as naphthalenedicarboxylic acid, 2,6-naphthalenedicarboxylic acid, 2,2'-biphenyldicarboxylic acid, 3,3'-biphenyldicarboxylic acid, 4,4'-biphenyldicarboxylic acid, anthracene dicarboxylic acid, Malonic acid, fumaric acid, maleic acid, succinic acid, itaconic acid, adipic acid, azelaic acid, sebacic acid, 1,11-undecanedicarboxylic acid, 1,12-dodecanedicarboxylic acid, 1,14-tetradecanedicarboxylic acid, 1, 18-octadecanedicarboxylic acid, , 2-cyclohexanedicarboxylic acid, 1,3-cyclohexanedicarboxylic acid, 1,4-cyclohexanedicarboxylic acid, and aliphatic dicarboxylic acids such as dimer acid, without limitation. These copolymerization components may use only 1 type and may use 2 or more types together.

Examples of the thermoplastic polyacrylonitrile include a copolymer of acrylonitrile and a copolymer component.

Specific examples of copolymerization components of thermoplastic polyacrylonitrile include acrylic acid esters such as methyl acrylate, ethyl acrylate, propyl acrylate, butyl acrylate, methyl methacrylate, ethyl methacrylate, propyl methacrylate, butyl methacrylate, etc. Methacrylic acid esters, haloolefins such as vinyl chloride, vinyl fluoride, vinylidene chloride, vinylidene fluoride, vinyl amides such as acrylamide, methacrylamide, vinyl pyrrolidone, vinyl esters such as vinyl acetate and vinyl propionate, styrene, vinyl pyridine, etc. Vinyl aromatic compounds, vinyl carboxylic acids such as acrylic acid and methacrylic acid, vinyl sulfonic acids such as p-styrene sulfonic acid, allyl sulfonic acid and methallyl sulfonic acid, sodium acrylate , Sodium methacrylate, sodium p- styrenesulfonate, sodium allyl sulfonate, although vinyl carboxylic acid or salt of vinyl sulfonic acid, such as sodium methallyl sulfonic acid, and the like. These copolymerization components may use only 1 type and may use 2 or more types together.

Specific examples of thermoplastic polyacrylonitrile include acrylonitrile-methyl acrylate copolymer, acrylonitrile-ethyl methacrylate copolymer, acrylonitrile-vinyl chloride copolymer, acrylonitrile-acrylamide copolymer, acrylonitrile-vinyl acetate copolymer, Examples include, but are not limited to, acrylonitrile-styrene copolymer, acrylonitrile-acrylic acid copolymer, acrylonitrile-sodium methacrylate copolymer, and the like.

Examples of the thermoplastic polyurethane include a polymer compound obtained by a three-component reaction of diisocyanate, polyol, and chain extender.

Specific examples of the diisocyanate include trimethylene diisocyanate, tetramethylene diisocyanate, hexamethylene diisocyanate, isophorone diisocyanate, 1,3-bis (isocyanate methyl) cyclohexane, 1,4-bis (isocyanate methyl) cyclohexane, 1,3-cyclohexane diisocyanate, 1,4-cyclohexane diisocyanate, 2,2'-diphenylmethane diisocyanate, 2,4'-diphenylmethane diisocyanate, 4,4'-diphenylmethane diisocyanate, 1,5-naphthalene diisocyanate, 2,4-toluene diisocyanate, 2,6-toluene Examples include, but are not limited to, diisocyanate and diphenylmethane diisocyanate.

Examples of the polyol include, but are not limited to, polyether polyol, polyester polyol, polycaprolactone polyol, and polycarbonate polyol. The polyether polyol is obtained by ring-opening addition polymerization of a low molecular weight polyol or a low molecular weight polyamine and an alkylene oxide. The polyester polyol is obtained by a condensation reaction or transesterification reaction between a low molecular weight polyol and a polyvalent carboxylic acid, a polyvalent carboxylic acid ester, a polyvalent carboxylic acid anhydride, or a polyvalent carboxylic acid halide. The polycaprolactone polyol is obtained by ring-opening polymerization of a low molecular weight polyol and caprolactone. The polycarbonate polyol is obtained by addition polymerization of a low molecular weight polyol and carbonate.

Specific examples of low molecular weight polyols include ethylene glycol, propylene glycol, 1,3-propanediol, 1,4-butanediol, 1,5-pentanediol, 1,6-hexanediol, cyclohexanediol, cyclohexanedimethanol, bisphenol , Diethylene glycol, dipropylene glycol, glycerin, trimethylolpropane, pentaerythritol, diglycerin, xylitol, sorbitol, mannitol, dipentaerythritol sucrose, and the like. Specific examples of the low molecular weight polyamine include, but are not limited to, ethylenediamine, 1,3-propanediamine, 1,4-butanediamine, 1,6-hexamethylenediamine, 1,4-cyclohexanediamine, and hydrazine. . Specific examples of the alkylene oxide include, but are not limited to, ethylene oxide, propylene oxide, butylene oxide, and tetrahydrofuran. Specific examples of polyvalent carboxylic acids include, but are not limited to, oxalic acid, malonic acid, fumaric acid, maleic acid, succinic acid, itaconic acid, adipic acid, phthalic acid, isophthalic acid, terephthalic acid, and dimer acid. Not. Specific examples of the polycarboxylic acid ester include, but are not limited to, methyl ester and ethyl ester of polyvalent carboxylic acid. Specific examples of the polyvalent carboxylic acid anhydride include, but are not limited to, oxalic anhydride, succinic anhydride, maleic anhydride, phthalic anhydride, trimellitic anhydride, and the like. Specific examples of the polyvalent carboxylic acid halide include, but are not limited to, oxalic acid dichloride and adipic acid dichloride. Specific examples of caprolactone include, but are not limited to, ε-caprolactone. Specific examples of carbonate include, but are not limited to, ethylene carbonate and dimethyl carbonate.

Specific examples of the chain extender include ethanediol, 1,2-propanediol, 1,3-propanediol, 1,4-butanediol, 1,6-hexanediol, diethylene glycol, dipropylene glycol and the like. It is not limited to these.

The modified polyolefin can suitably be a copolymer of an α-olefin and a copolymer component. Examples of the copolymer type include, but are not limited to, a block copolymer and a graft copolymer.

The carbon number of the α-olefin is preferably 2 to 20, and the molecular chain of the α-olefin may be linear or branched. Specific examples of the α-olefin include ethylene, propylene, 1-butene, 1-pentene, 1-hexene, 1-octene, 1-decene, 1-dodecene, 1-tetradecene, 1-hexadecene, 1-octadecene, 1- Examples include, but are not limited to, eicosene, 3-methyl-1-butene, 3-methyl-1-pentene, 4-methyl-1-pentene, 3-ethyl-1-pentene, and 3-ethyl-1-hexene. Not. These α-olefins may be used alone or in combination of two or more.

As the copolymerization component of the modified polyolefin, an unsaturated compound containing a polar functional group having a high affinity for the dye can be suitably used. Examples of the polar functional group having a high affinity with the dye include a carboxylic acid group, a carboxylic anhydride group, a carboxylic acid group, a carboxylic acid ester group, and a carboxylic acid amide group. Specific examples of copolymer components of the modified polyolefin include unsaturated carboxylic acids such as maleic acid, fumaric acid, itaconic acid, acrylic acid and methacrylic acid, unsaturated carboxylic acid anhydrides such as maleic anhydride and itaconic anhydride, methacrylic acid Unsaturated carboxylic acid salts such as sodium and sodium acrylate, vinyl acetate, vinyl propionate, methyl acrylate, ethyl acrylate, methyl methacrylate, maleic acid monoethyl ester and other unsaturated carboxylic acid esters, acrylamide and maleic acid monoamide Unsaturated amides such as, but not limited to. These copolymerization components may use only 1 type and may use 2 or more types together.

Specific examples of modified polyolefins include ethylene-maleic acid copolymer, ethylene-fumaric acid copolymer, ethylene-acrylic acid copolymer, ethylene-methacrylic acid copolymer, ethylene-acrylic acid-sodium methacrylate copolymer. , Ethylene-vinyl acetate copolymer, ethylene-ethyl acrylate copolymer, acrylic acid grafted polyethylene, maleic anhydride grafted polyethylene, maleic anhydride grafted polypropylene, maleic anhydride grafted ethylene-propylene copolymer, acrylic acid grafted ethylene -Propylene copolymer, maleic acid grafted ethylene-propylene-norbornadiene copolymer, acrylic acid grafted ethylene-vinyl acetate copolymer, and the like, but are not limited thereto.

The polyvinyl chloride may be a homopolymer of vinyl chloride or a copolymer of vinyl chloride and a copolymer component.

Specific examples of polyvinyl chloride copolymerization components include vinyl esters such as vinyl acetate and vinyl propionate, acrylic acid esters such as propyl acrylate and butyl acrylate, and olefins such as ethylene and propylene. It is not limited. These copolymerization components may use only 1 type and may use 2 or more types together.

A cellulose derivative is a compound in which at least a part of three hydroxyl groups present in glucose, which is a constituent unit of cellulose, is derivatized to another functional group. For example, cellulose single ester with one ester group bonded to cellulose, cellulose mixed ester with two or more ester groups bonded, cellulose single ether with one ether group bonded, two or more ether groups bonded Examples thereof include, but are not limited to, cellulose mixed ethers, cellulose ether esters in which one or two or more ether groups and ester groups are bonded. There is no restriction | limiting in particular about the substitution degree of a cellulose derivative, According to melt viscosity, thermoplasticity, etc., it can select suitably. In addition, when the cellulose derivative does not exhibit thermoplasticity, a plasticizer may be added to the cellulose derivative for the purpose of improving thermal fluidity.

Specific examples of cellulose derivatives include cellulose acetate, cellulose propionate, cellulose butyrate, cellulose valerate, cellulose stearate, and other cellulose esters, cellulose acetate propionate, cellulose acetate butyrate, cellulose acetate valerate, and cellulose acetate. Cellulose mixed esters such as caproate, cellulose propionate butyrate, cellulose acetate propionate butyrate, cellulose single ethers such as methyl cellulose, ethyl cellulose, propyl cellulose, hydroxymethyl cellulose, hydroxyethyl cellulose, hydroxypropyl cellulose, carboxymethyl cellulose, methyl Ethyl cellulose, methyl propyl cellulose , Ethyl mixed cellulose such as ethylpropylcellulose, hydroxymethylmethylcellulose, hydroxymethylethylcellulose, hydroxypropylmethylcellulose, hydroxyethylmethylcellulose, hydroxypropylmethylcellulose, methylcellulose acetate, methylcellulose propionate, ethylcellulose acetate, ethylcellulose propionate, propylcellulose acetate, Propylcellulose propionate, hydroxymethylcellulose acetate, hydroxymethylcellulose propionate, hydroxyethylcellulose acetate, hydroxyethylcellulose propionate, hydroxypropylcellulose acetate, hydroxypropylcellulose propionate, carbo Shi cellulose acetate, but cellulose ether esters such as carboxymethyl cellulose propionate and the like, without limitation.

The composite ratio of the polymethylpentene resin and the thermoplastic resin in the polymethylpentene fiber used in the present invention can be appropriately selected according to the use and required characteristics, but the excellent lightness of the polymethylpentene resin is impaired. Therefore, the polymethylpentene resin in the polymethylpentene fiber needs to be combined within a range of 60% by weight or more. When the polymethylpentene resin is (A) and the thermoplastic resin is (B), the composite ratio (weight ratio) A / B of (A) to (B) is 80/20 to 99/1. It is more preferable. It is preferable for the composite ratio of the polymethylpentene resin to be in the above-mentioned range since color development by the thermoplastic resin can be imparted to the polymethylpentene fiber while maintaining particularly excellent lightness. On the other hand, if the composite ratio of the polymethylpentene resin is 99% by weight or less, that is, if the composite ratio of the thermoplastic resin is 1% by weight or more, a highly color-forming thermoplastic resin is a polymethylpentene resin having a low refractive index. It is preferable because it can be dispersed according to the composite ratio and a vivid and deep color can be realized. The composite ratio (weight ratio) of the polymethylpentene resin (A) and the thermoplastic resin (B) is more preferably A / B = 85/15 to 97/3, and A / B = 90/10 to 95 Particularly preferred is / 5. In the case where a plurality of thermoplastic resins are used in combination, the composite ratio is determined with the sum of them as the thermoplastic resin (B).

In the present invention, for the purpose of improving the interfacial adhesion between the polymethylpentene-based resin and the thermoplastic resin and controlling the dispersion state, a thermoplastic resin (hereinafter, referred to as a compatibilizer) in a part of the thermoplastic resin as necessary. (Simply referred to as a compatibilizer) may be used. The compatibilizing agent can be appropriately selected according to the type of the thermoplastic resin. In addition, a compatibilizing agent may be used independently and may use multiple together.

As a compatibilizing agent in the present invention, a thermoplastic component in which both a hydrophobic component having high affinity for polymethylpentene resin having high hydrophobicity and a component having high affinity for thermoplastic resin are contained in the same molecule. Resin can be used. Alternatively, a thermoplastic resin in which both a hydrophobic component having high affinity for the polymethylpentene resin and a functional group capable of reacting with the thermoplastic resin are contained in the same molecule can be used.

Specific examples of the hydrophobic component constituting the compatibilizer include polyethylene, polypropylene, polymethylpentene, polystyrene, ethylene-propylene copolymer, ethylene-butylene copolymer, propylene-butylene copolymer, styrene-ethylene-butylene. -Styrene copolymers and the like may be mentioned, but not limited thereto.

Specific examples of components having high affinity for the thermoplastic resin constituting the compatibilizer or functional groups capable of reacting with the thermoplastic resin include carboxylic acid groups, carboxylic anhydride groups, carboxylic acid groups, carboxylic acid ester groups, Examples include, but are not limited to, acid amide groups, amino groups, imino groups, alkoxysilyl groups, silanol groups, silyl ether groups, hydroxyl groups, and epoxy groups.

Specific examples of the compatibilizer include maleic acid-modified polyethylene, maleic anhydride-modified polypropylene, maleic anhydride-modified polymethylpentene, epoxy-modified polystyrene, maleic anhydride-modified styrene-ethylene-butylene-styrene copolymer, amino-modified styrene- Examples thereof include, but are not limited to, ethylene-butylene-styrene copolymers and imino-modified styrene-ethylene-butylene-styrene copolymers.

In the present invention, when a compatibilizing agent is used, the amount used is preferably in the range where the ratio to the thermoplastic resin containing the compatibilizing agent is 0.1 to 30% by weight. If the use amount of the compatibilizing agent is 0.1% by weight or more, it is preferable because a compatibilizing effect between the polymethylpentene resin and the thermoplastic resin can be obtained and the yarn operability such as suppression of yarn breakage is improved. On the other hand, if the amount of the compatibilizer used is 30% by weight or less, the polymethylpentene fiber can maintain the fiber characteristics, appearance, and texture derived from the polymethylpentene resin and thermoplastic resin. The amount of the compatibilizer used is more preferably 0.5 to 20% by weight, still more preferably 1 to 10% by weight.

The polymethylpentene fiber used in the present invention may be an original fiber in which a pigment or a colorant is added to a polymethylpentene-based resin as necessary for the purpose of imparting color developability. The pigments and colorants may be used alone or in combination.

Specific examples of pigments and colorants in the present invention include inorganic pigments such as carbon black, cobalt blue, and chrome yellow, and organic pigments such as azo, phthalocyanine, quinacridone, anthraquinone, and dioxazine. However, it is not limited to these.

In the present invention, the amount of pigment or colorant added is preferably 0.2 to 10% by weight in the polymethylpentene fiber. If the amount of the pigment or colorant added is 0.2% by weight or more, it is preferable because sufficient color developability can be imparted to the polymethylpentene fiber. On the other hand, if the addition amount of the pigment or the colorant is 10% by weight or less, the occurrence of yarn breakage is small, the spinning operability is good, and the resulting polymethylpentene fiber has good fiber characteristics, which is preferable. The amount of the pigment or colorant added is more preferably 0.5 to 8.5% by weight, and even more preferably 1.0 to 7.0% by weight.

As a method for adding a pigment or a colorant in the present invention, a pigment or a colorant is added to a polymethylpentene-based resin, a master batch is prepared by melt kneading using a twin screw extruder, and then melt spinning is performed. It is done. In addition, when performing melt spinning, a polymethylpentene resin and a pigment or colorant may be blended, but are not limited thereto.

The single yarn fineness of the polymethylpentene fiber used in the present invention is 2 to 20 dtex. If the single yarn fineness of the polymethylpentene fiber is 2 dtex or more, in addition to few yarn breaks and good process passability, there is little fluffing during use and excellent quality and durability. On the other hand, if the single yarn fineness of the polymethylpentene fiber is 20 dtex or less, the flexibility of the spun yarn and the fiber structure is not impaired. The single yarn fineness of the polymethylpentene fiber is more preferably 2 to 15 dtex, and further preferably 2 to 10 dtex.

The average fiber length of the polymethylpentene fiber used in the present invention is preferably 10 to 100 mm. If the average fiber length of the polymethylpentene fiber is 10 mm or more, it is preferable because fibers can be sufficiently entangled and sufficient strength can be obtained when a spun yarn is used. On the other hand, when the average fiber length of the polymethylpentene fiber is 100 mm or less, the process passability and the handleability are good, which is preferable. The average fiber length of the polymethylpentene fiber is more preferably 15 to 90 mm, and still more preferably 20 to 80 mm. Further, the fiber lengths of the polymethylpentene fibers may be the same or different.

The cross-sectional shape of the polymethylpentene fiber used in the present invention is not particularly limited and can be appropriately selected according to the application and required characteristics, and may be a perfect circular cross-section or a non-circular cross-section. Also good. Specific examples of non-circular cross sections include, but are not limited to, multi-leaf, polygon, flat, oval, C-shaped, H-shaped, S-shaped, T-shaped, W-shaped, X-shaped, Y-shaped, etc. Not. Moreover, it is preferable that the polymethylpentene fiber used by this invention is a solid fiber from the point of process passage property and handleability.

The strength of the polymethylpentene fiber used in the present invention is not particularly limited and can be appropriately selected according to the use and required characteristics, but is preferably 0.5 to 5.0 cN / dtex. The strength of the polymethylpentene fiber is preferably as high as possible from the viewpoint of mechanical properties, but is preferably 0.5 cN / dtex or more. If the strength of the polymethylpentene fiber is 0.5 cN / dtex or more, it is preferable because the thread breakage is small, the process passability is good, and the durability is excellent. The strength of the polymethylpentene fiber is more preferably 0.7 to 5.0 cN / dtex, still more preferably 1.0 to 5.0 cN / dtex.

The elongation of the polymethylpentene fiber used in the present invention is not particularly limited and can be appropriately selected according to the application and required characteristics, but is preferably 5 to 300%. If the elongation of the polymethylpentene fiber is 5% or more, it is preferable because the abrasion resistance of the spun yarn and the fiber structure is good, the generation of fluff is small, and the durability is good. On the other hand, when the polymethylpentene fiber is an undrawn yarn, it is preferable that the elongation is 300% or less because the handleability in drawing is good and the mechanical properties can be improved by drawing. When the polymethylpentene fiber is a drawn yarn, an elongation of 40% or less is preferable because the dimensional stability of the spun yarn and the fiber structure is improved. When the polymethylpentene fiber is an undrawn yarn, the elongation is preferably 8 to 280%, more preferably 10 to 250%. When the polymethylpentene fiber is a drawn yarn, the elongation is more preferably 8 to 35%, and further preferably 10 to 30%.

The initial tensile resistance of the polymethylpentene fiber used in the present invention is not particularly limited and can be appropriately selected according to the application and required characteristics, but is preferably 10 to 100 cN / dtex. If the initial tensile resistance of the polymethylpentene fiber is 10 cN / dtex or more, the process passability and handleability are good, and the mechanical properties are excellent, which is preferable. On the other hand, it is preferable that the initial tensile resistance of the polymethylpentene fiber is 100 cN / dtex or less because the flexibility of the spun yarn and the fiber structure is not impaired. The initial tensile resistance of the polymethylpentene fiber is more preferably 15 to 80 cN / dtex, still more preferably 20 to 60 cN / dtex.

The specific gravity of the polymethylpentene fiber used in the present invention is not particularly limited and can be appropriately selected according to the type of thermoplastic resin, the composite ratio, the application and required characteristics, and is 0.83 to 0.95. It is preferable. Since the specific gravity of the polymethylpentene resin is 0.83, it is preferably 0.95 or less from the viewpoint of light weight even when combined with a thermoplastic resin. If the specific gravity of the polymethylpentene fiber is 0.95 or less, it is preferable because a spun yarn having both lightness by the polymethylpentene resin and color development by the thermoplastic resin can be obtained. The specific gravity of the polymethylpentene fiber is more preferably 0.83 to 0.93, still more preferably 0.83 to 0.90.

The polymethylpentene fiber used in the present invention may have crimps. It is preferable to have crimps because, in the case of a spun yarn, in addition to strengthening the entanglement between the fibers, it is possible to obtain a bulky and light texture.

The number of crimps of the polymethylpentene fiber used in the present invention is not particularly limited and can be appropriately selected according to the use and required characteristics, but is preferably 2 to 40 m / 25 mm. When the number of crimps of the polymethylpentene fiber is 2 threads / 25 mm or more, in addition to strengthening the entanglement between the fibers in the case of a spun yarn, it imparts bulkiness to the spun yarn and the fiber structure. This is preferable. On the other hand, if the number of crimps of the polymethylpentene fiber is 40 peaks / 25 mm or less, it is preferable because the processability and handleability are good and the bulkiness of the spun yarn and the fiber structure is not impaired. . The number of crimps of the polymethylpentene fiber is more preferably 4 to 30 peaks / 25 mm, and still more preferably 6 to 20 peaks / 25 mm.

The crimp rate of the polymethylpentene fiber used in the present invention is not particularly limited and can be appropriately selected according to the application and required characteristics, but is preferably 5 to 40%. If the crimp rate of the polymethylpentene fiber is 5% or more, in addition to strengthening the entanglement between the fibers when the spun yarn is used, it is possible to impart bulkiness to the spun yarn and the fiber structure. This is preferable because it is possible. On the other hand, if the polymethylpentene fiber has a crimp rate of 40% or less, it is preferable because the processability and handleability are good and the bulkiness of the spun yarn and fiber structure is not impaired. The crimp rate of the polymethylpentene fiber is more preferably 8 to 35%, and still more preferably 10 to 30%.

Next, the spun yarn of the present invention will be described.

The spun yarn of the present invention has a twist coefficient K calculated by the following formula (I) of 1.3 to 6.5 when the number of twists is T (times / 25.4 mm) and the English cotton count is N. is there.
(I) K = T ÷ N ^1/2
If the twist coefficient K is 1.3 or more, the fibers are entangled with each other when the spun yarn is used. On the other hand, if the twist coefficient is 6.5 or less, the texture does not become too hard, and the flexibility of the spun yarn and the fiber structure is not impaired. The twist coefficient K can be appropriately selected according to the use and required characteristics of the spun yarn, but is more preferably 2.0 to 5.5, and still more preferably 2.5 to 5.0. 3.0 to 4.5 is particularly preferable.

The number of twists of the spun yarn of the present invention is not particularly limited and can be appropriately selected according to the application and required characteristics, but is preferably 5 to 75 times / 25.4 mm. If the number of twists of the spun yarn is 5 times / 25.4 mm or more, the fiber is entangled in a spun yarn, so that there is little generation of fluff at the time of use and excellent durability, which is preferable. On the other hand, if the number of twists of the spun yarn is 75 times / 25.4 mm or less, the texture is not too hard, and the flexibility of the spun yarn and the fiber structure is not impaired. The number of twists of the spun yarn is more preferably 10 to 50 times / 25.4 mm, and further preferably 15 to 30 times / 25.4 mm.

The spun yarn in the present invention may be composed only of polymethylpentene fibers, and may be blended with chemical fibers or natural fibers. Alternatively, a spun yarn and a spun yarn made of chemical fiber or natural fiber may be twisted together. In addition, the chemical fiber or natural fiber used for blending or twisting may be used alone or in combination.

The chemical fiber in the present invention is not particularly limited and can be appropriately selected according to the use and required characteristics. Specific examples of the chemical fiber include, but are not limited to, polyester fiber, polyamide fiber, polyacrylonitrile fiber, cellulose fiber, and cellulose fiber. Of these, polyester fibers, polyamide fibers, polyacrylonitrile fibers, cellulose fibers and the like are preferable.

Specific examples of the polyester fiber include polyethylene terephthalate, polypropylene terephthalate, polybutylene terephthalate, and polylactic acid. Specific examples of the polyamide fiber include nylon 6, nylon 66, and nylon 610. Specific examples of the polyacrylonitrile fiber. Specific examples of acrylonitrile-methyl acrylate copolymer, acrylonitrile-ethyl methacrylate copolymer, and cellulose fiber include cellulose diacetate, cellulose triacetate, cellulose acetate propionate, cellulose acetate butyrate, and specific examples of cellulose fiber. Examples thereof include, but are not limited to, viscose rayon and cupra rayon.

The natural fiber in the present invention is not particularly limited and can be appropriately selected according to the use and required characteristics. Specific examples of natural fibers include, but are not limited to, cotton, silk, hemp, wool, and the like.

The blend ratio (weight ratio) of the polymethylpentene fiber and the chemical fiber or natural fiber in the spun yarn of the present invention is not particularly limited and can be appropriately selected according to the use and required characteristics. (A) and chemical fiber or natural fiber (B), the blend ratio (weight ratio) of (A) and (B) is A / B = 85/15 to 97/3 Is preferred. A blending ratio of polymethylpentene fibers of 85% by weight or more is preferable because it does not impair the lightness of the spun yarn. On the other hand, if the blend ratio of the polymethylpentene fiber is 97% by weight or less, that is, if the blend ratio of the chemical fiber or the natural fiber is 3% by weight or more, the texture of the chemical fiber or the natural fiber can be imparted to the spun yarn. preferable. The blend ratio (weight ratio) of the polymethylpentene fiber (A) and the chemical fiber or natural fiber (B) is more preferably A / B = 90/10 to 95/5.

The melting point or decomposition temperature of the chemical fiber or natural fiber in the spun yarn of the present invention is preferably as high as possible from the viewpoint of heat resistance, but is preferably 200 ° C. or higher. In the present invention, when the chemical fiber or natural fiber has a clear melting point, the melting point is used as an index of heat resistance, and when the chemical fiber or natural fiber does not show a clear melting point, the decomposition temperature is used as an index of heat resistance. If the melting point or decomposition temperature of the chemical fiber or natural fiber is 200 ° C or higher, the iron can be used because of its excellent heat resistance, and it can be used for applications that are used at high temperatures in addition to general clothing applications. This is preferable. The melting point or decomposition temperature of the chemical fiber or natural fiber is more preferably 210 ° C. or higher, and further preferably 220 ° C. or higher.

The English cotton count of the spun yarn of the present invention is not particularly limited and can be appropriately selected according to the application and required characteristics, but it is preferably 1 to 200. It is preferable if the spun yarn has an English cotton count of 1 or more because the flexibility of the spun yarn and fiber structure is not impaired. On the other hand, if the spun yarn has an English cotton count of 200 or less, it is preferable because the yarn breakage during processing and the process passability are good, as well as the occurrence of fluff during use and excellent durability. The English cotton count of the spun yarn is more preferably 10 to 150, and still more preferably 20 to 100.

The strength of the spun yarn of the present invention is not particularly limited and can be appropriately selected according to the application and required characteristics, but is preferably 0.5 to 5.0 cN / dtex. The strength of the spun yarn is preferably as high as possible from the viewpoint of mechanical properties, but is preferably 0.5 cN / dtex or more. If the strength of the spun yarn is 0.5 cN / dtex or more, it is preferable because the yarn breakage is small, process passability is good, and durability is excellent. The strength of the spun yarn is more preferably 0.7 to 5.0 cN / dtex, and still more preferably 1.0 to 5.0 cN / dtex.

The elongation of the spun yarn of the present invention is not particularly limited and can be appropriately selected according to the application and required characteristics, but is preferably 5 to 100%. An elongation of the spun yarn of 5% or more is preferable because the spun yarn and the fiber structure have good wear resistance, less fluffing, and good durability. On the other hand, an elongation of the spun yarn of 100% or less is preferable because the dimensional stability of the spun yarn and the fiber structure is improved. The elongation of the spun yarn is preferably 8 to 80%, more preferably 10 to 40%.

The initial tensile resistance of the spun yarn of the present invention is not particularly limited and can be appropriately selected according to the application and required characteristics, but is preferably 10 to 100 cN / dtex. If the initial tensile resistance of the spun yarn is 10 cN / dtex or more, the process passability and handleability are good, and the mechanical properties are excellent, which is preferable. On the other hand, if the initial tensile resistance of the spun yarn is 100 cN / dtex or less, the flexibility of the spun yarn and the fiber structure is not impaired, which is preferable. The initial tensile resistance of the spun yarn is more preferably 15 to 80 cN / dtex, still more preferably 20 to 60 cN / dtex.

The apparent specific gravity of the spun yarn of the present invention is not particularly limited, and can be appropriately selected according to the type of chemical fiber or natural fiber, the blending ratio, application and required characteristics, and is 0.83 to 1.2. It is preferable. The apparent specific gravity of the spun yarn is preferably as small as possible from the viewpoint of lightness, but is preferably 0.83 or more. If the apparent specific gravity of the spun yarn is 0.83 or more, it is preferable because the texture of the chemical fiber or the natural fiber can be imparted to the polymethylpentene fiber excellent in light weight without impairing the light weight of the spun yarn. The apparent specific gravity of the spun yarn is more preferably 0.83 to 1.15, and still more preferably 0.83 to 1.1.

The spun yarn of the present invention can be handled in the same manner as general fibers for weaving and knitting, and when forming a fiber structure, the spun yarn of the present invention and other fibers may be combined by weaving or knitting. .

The form of the fiber structure composed of the spun yarn of the present invention is not particularly limited, and can be made into a woven fabric, a knitted fabric, a pile fabric, a nonwoven fabric, or the like according to a known method. Further, the fiber structure comprising the spun yarn of the present invention may be any woven or knitted structure, such as plain weave, twill weave, satin weave, or these changed weaves, warp knitting, weft knitting, circular knitting, lace knitting. Or these change knitting etc. can be adopted suitably.

Next, a method for producing the spun yarn of the present invention will be described.

The spun yarn of the present invention is obtained by obtaining a polymethylpentene fiber from a raw material such as a polymethylpentene resin or a thermoplastic resin by melt spinning according to a known method, and then drawing, crimping, cutting, roving, fine spinning. Although it can obtain through processes, such as spinning, it is not limited to these.

In the present invention, it is preferable to dry the polymethylpentene resin and the thermoplastic resin before melt spinning, so that the water content is 0.3% by weight or less. A water content of 0.3% by weight or less is preferable because it does not cause foaming due to moisture during melt spinning and enables stable spinning. The water content is more preferably 0.2% by weight or less, and further preferably 0.1% by weight or less.

As the melt spinning method, a known method can be suitably employed for each of single component spinning and composite spinning. Examples of the method of compounding the polymethylpentene resin and the thermoplastic resin by melt spinning include, but are not limited to, core-sheath type compound spinning, sea-island type compound spinning, polymer alloy type spinning, and the like.

When performing core-sheath type composite spinning, each chip is dried as necessary, and then the chip is supplied to a melt spinning machine such as an extruder type or a pressure melter type to separate the core component and the sheath component separately. And weigh with a metering pump. Then, after introducing into the spinning pack heated in the spinning block and filtering the molten polymer in the spinning pack, the core component and the sheath component are merged with the core-sheath type composite spinneret to form a core-sheath structure. It is possible to suitably employ a method of discharging from a fiber into a yarn. For the sea-island type composite spinning, the same method as the core-sheath type composite spinning can be suitably employed except that the sea component and the island component are separately melted to form a sea-island structure using a sea-island type composite spinneret.

In the case of performing polymer alloy spinning, examples of methods for discharging from a spinneret into fiber yarns include the following examples, but are not limited thereto. As a first example, a polymethylpentene resin and a thermoplastic resin are melted and kneaded in advance using an extruder, etc., and the chips are dried as necessary, and then supplied to a melt spinning machine for melting. Measure with a metering pump. Then, after introducing into the spinning pack heated in the spinning block and filtering the molten polymer in the spinning pack, there is a method of discharging from the spinneret into a fiber yarn. As a second example, if necessary, the chip is dried, and after mixing the polymethylpentene resin and the thermoplastic resin in the state of the chip, the mixed chip is supplied to the melt spinning machine and melted, and the metering pump is used. Weigh. Then, after introducing into the spinning pack heated in the spinning block and filtering the molten polymer in the spinning pack, there is a method of discharging from the spinneret into a fiber yarn.

The fiber yarn discharged from the spinneret is cooled and solidified by a cooling device in any case of single component spinning, core-sheath type composite spinning, sea-island type composite spinning, and polymer alloy type spinning, and is taken up by a roller. Furthermore, a heating cylinder or a heat insulation cylinder having a length of 2 to 20 cm may be provided at the lower part of the spinneret as needed in order to improve the spinning maneuverability, productivity, and mechanical properties of the fiber. Moreover, you may supply oil to a fiber yarn using an oil supply apparatus, and you may give an entanglement to a fiber yarn using an entanglement apparatus.

The spinning temperature in melt spinning can be appropriately selected according to the melting point and heat resistance of the polymethylpentene resin and the thermoplastic resin, but is preferably 220 to 320 ° C. If the spinning temperature is 220 ° C. or higher, the elongation viscosity of the fiber yarn discharged from the spinneret is sufficiently lowered, so that the discharge is stable, and further, the spinning tension is not excessively increased and the yarn breakage is suppressed. This is preferable. On the other hand, if the spinning temperature is 320 ° C. or lower, it is preferable because thermal decomposition during spinning can be suppressed and the resulting polymethylpentene fiber does not have poor mechanical properties or coloring. The spinning temperature is more preferably 240 to 300 ° C, and further preferably 260 to 280 ° C.

The spinning speed in melt spinning can be appropriately selected according to the spinning temperature, the single yarn fineness of the polymethylpentene fiber, etc., but is preferably 300 to 2500 m / min. A spinning speed of 300 m / min or more is preferable because the running yarn is stable and yarn breakage can be suppressed. On the other hand, a spinning speed of 2500 m / min or less is preferable because the fiber yarn can be sufficiently cooled and stable spinning can be performed. The spinning speed is more preferably 500 to 2000 m / min, and still more preferably 1000 to 1500 m / min.

The method of taking out the spun yarn may be a method of taking up with a first godet roller and winding it up with a winder through a second godet roller. From the viewpoint of productivity, a method of storing undrawn yarn in a storage container The so-called storage and take-up method can be suitably employed. Specifically, it is a method in which fiber yarns discharged from a plurality of spinnerets are guided by a number of roller groups and are shaken down and stored as a bundle in a storage container such as a can.

The total fineness of the polymethylpentene fiber after the storage and take-up method is not particularly limited and can be appropriately selected according to the draw ratio, the draw speed, etc., but is preferably 1,000 to 1,000,000 dtex. If the total fineness of the polymethylpentene fiber after carrying out the storage and taking-up method is 1000 dtex or more, it is preferable because thread breakage is small and processability is good. On the other hand, if the total fineness of the polymethylpentene fiber after carrying out the storage take-up method is 1 million dtex or less, the process passability and the handleability are good, which is preferable. The total fineness of the polymethylpentene fiber after the storage and take-up method is preferably 5000 to 700,000 dtex, and more preferably 10,000 to 500,000 dtex.

The undrawn yarn taken up by melt spinning may be drawn to obtain a spun yarn having desired fiber characteristics. The stretching method is not particularly limited, and in accordance with a known method, a two-step method of stretching unstretched yarn once wound on a drum, a direct spinning stretching method of continuously stretching without winding on a drum, a storage take-up method Although the method of extending | stretching after drawing the undrawn thread | yarn obtained by (1) is mentioned, It is not limited to these. From the viewpoint of productivity, a method of drawing after undrawn yarn obtained by the storage take-up method can be suitably employed. Specifically, undrawn yarns are launched from a plurality of storage containers, and after being aligned, are led to a drawing step.

The total fineness of the polymethylpentene fibers after the drawing is not particularly limited and can be appropriately selected according to the draw ratio, the draw speed, etc., but is preferably 10,000 to 1,000,000 dtex. If the total fineness of the polymethylpentene fiber after drawing is 10,000 dtex or more, it is preferable because thread breakage is small and processability is good. On the other hand, if the total fineness of the polymethylpentene fiber after the alignment is 1,000,000 dtex or less, the process passability and handleability are good, which is preferable. The total fineness of the polymethylpentene fiber after drawing is more preferably 50,000 to 700,000 dtex, and further preferably 100,000 to 500,000 dtex.

The heating method in stretching is not particularly limited as long as it is an apparatus capable of directly or indirectly heating the running yarn. Specific examples of the heating method include, but are not limited to, devices such as a heating roller, a hot pin, a hot plate, and a laser, a liquid bath such as hot water and hot water, a gas bath such as hot air and steam. These heating methods may be used alone or in combination. As the heating method, from the viewpoint of controlling the heating temperature, uniform heating to the running yarn, and not complicating the apparatus, contact with the heating roller, contact with the hot pin, contact with the hot plate, hot water or hot water, etc. Immersion in a liquid bath can be suitably employed. Furthermore, from the viewpoint of productivity, immersion in a liquid bath such as warm water or hot water is particularly preferable.

The draw ratio in the case of drawing can be appropriately selected according to the strength and elongation of the spun yarn made of polymethylpentene fiber, but is preferably 1.02 to 7.0 times. A draw ratio of 1.02 or more is preferable because mechanical properties such as strength and elongation of the polymethylpentene fiber can be improved by drawing. On the other hand, if the draw ratio is 7.0 times or less, yarn breakage during drawing is suppressed, and stable drawing can be performed. The draw ratio is more preferably 1.2 to 6.0 times, and still more preferably 1.5 to 5.0 times. Further, any one of a one-stage stretching method or a two-stage or more multi-stage stretching method may be used.

The drawing temperature in the case of drawing can be appropriately selected according to the strength and elongation of the spun yarn made of polymethylpentene fiber, but is preferably 50 to 95 ° C. A drawing temperature of 50 ° C. or higher is preferable because the yarn supplied to the drawing is sufficiently preheated, the thermal deformation during drawing becomes uniform, and the occurrence of fineness spots can be suppressed. On the other hand, a stretching temperature of 95 ° C. or lower is preferable because yarn breakage during stretching is suppressed and stable stretching can be performed. The stretching temperature is more preferably 55 to 90 ° C, still more preferably 60 to 85 ° C. If necessary, heat setting at 50 to 150 ° C. may be performed after stretching.

The stretching speed in the case of stretching can be appropriately selected according to the stretching method and the stretching ratio, but is preferably 30 to 1000 m / min. A drawing speed of 30 m / min or more is preferable because the running yarn is stabilized even when the total fineness of the undrawn yarn is large. On the other hand, a stretching speed of 1000 m / min or less is preferable because yarn breakage during stretching can be suppressed and stable stretching can be performed. The stretching speed is more preferably 50 to 800 m / min, and further preferably 100 to 500 m / min.

In the present invention, an oil agent may be applied to the polymethylpentene fiber before stretching, after stretching, after crimping, or in each step. Application of an oil agent is preferable because the coefficient of dynamic friction between fibers is reduced, and process passability and handleability are improved in a stretching process and a spinning process.

In the present invention, it is preferable to crimp the polymethylpentene fiber in any step from melt spinning to spinning. For example, crimps may be imparted before stretching or in the course of multistage stretching, but crimping is preferably imparted after stretching from the viewpoint of stretchability and obtained fiber characteristics.

The method for imparting crimp is not particularly limited, and examples thereof include, but are not limited to, a stuffing box method, an indentation heating gear method, and a high-speed air injection indentation method according to a known method. If necessary, steam heating may be performed at the time of crimping, or heat setting or drying may be performed after crimping. In the melt spinning step, crimp may be imparted by blowing a cooling air from one side of the fiber yarn discharged from the spinneret to perform asymmetric cooling. The temperature of the cooling air is preferably 20 to 30 ° C. and the wind speed is preferably 20 to 100 m / min.

The treatment temperature for imparting crimps can be appropriately selected according to the application and required characteristics, but is preferably 100 to 250 ° C. in order to impart stable crimps. A treatment temperature of 100 ° C. or higher is preferable because the yarn supplied to the crimp is sufficiently preheated and thermally deformed when the crimp is applied. On the other hand, a treatment temperature of 250 ° C. or lower is preferable because thermal degradation of the polymethylpentene fiber can be suppressed during crimping, and mechanical properties and coloration of the obtained spun yarn do not occur. The treatment temperature for imparting crimps is more preferably 120 to 230 ° C, and further preferably 150 to 200 ° C.

The method for cutting the polymethylpentene fiber is not particularly limited, and examples thereof include a rotary cutter and a guillotine cutter, but are not limited thereto. Further, the polymethylpentene fiber may be cut into a fixed length, or may be cut so that the fiber length has a distribution.

The spinning method is not particularly limited, and a spun yarn is obtained by using a polymethylpentene fiber according to a known method, through the steps of cotton smashing, carding, kneading, roving and spinning. However, it is not limited to these.

In the present invention, when spinning, polymethylpentene fibers and chemical fibers or natural fibers may be blended at a desired ratio. The method of blending is not particularly limited, and in accordance with a known method, each raw cotton is put into a separate series from the battering to carding (card) process, and each sliver is combined in the drawing process, Examples include, but are not limited to, a method in which a plurality of roving yarns or slivers are supplied and combined in the spinning process.

In the present invention, twisting may be performed when spinning. The method of twisting is not particularly limited, and according to known methods, false twisting methods such as ring, flyer, pot, mule, open end, binding method, alternating twisting method, interlacing, gluing method, Examples include, but are not limited to, a non-twisting method such as a fusion method.

The spun yarn obtained in the present invention may be twisted with a spun yarn made of chemical fiber or natural fiber. The method of twisting is not particularly limited, and according to known methods, false twisting methods such as ring, flyer, pot, mule, open end, false twisting methods such as bundling method, alternating twisting method, interlacing, gluing method, fusion Examples include, but are not limited to, a non-twisting method such as a wearing method. The number of twisted yarns is not particularly limited and can be appropriately selected according to the fiber characteristics of the spun yarn after twisting, but is preferably 5 to 75 times / 25.4 mm. . When the number of twisted yarns is 5 times / 25.4 mm or more, the fibers constituting the spun yarn are entangled with each other, so that generation of fluff is small during use and durability is excellent. On the other hand, if the number of twisted yarns is 75 times / 25.4 mm or less, in addition to good process passability, the texture does not become too hard, and the flexibility of the spun yarn and the fiber structure may be impaired. It is preferable because it is not present. The number of twists is more preferably 10 to 50 times / 25.4 mm, and further preferably 15 to 30 times / 25.4 mm.

The dyeing method of the spun yarn of the present invention and the fiber structure comprising the spun yarn is not particularly limited, and according to known methods, cheese dyeing machine, liquid dyeing machine, drum dyeing machine, beam dyeing machine, jigger, high-pressure jigger Etc. can be suitably employed.

In the present invention, a dye can be appropriately selected according to the type of thermoplastic resin combined with the polymethylpentene resin, chemical fiber or natural fiber used for blending or twisting. When using any dye, polymethylpentene resin is hardly dyed, but by coloring thermoplastic resin, chemical fiber, and natural fiber, coloring property to the spun yarn and fiber structure is improved. Can be granted. As the thermoplastic resin, disperse dyes are used when polyester is used, acidic dyes are used when polyamide is used, cationic dyes are used when thermoplastic polyacrylonitrile is used, acidic dyes and modified polyolefins are used when thermoplastic polyurethane is used. In this case, a cationic dye, a disperse dye in the case of using polyvinyl chloride, and a disperse dye in the case of using a cellulose derivative can be preferably used, but are not limited thereto. When using polyester fiber as the chemical fiber, disperse dye, when using polyamide fiber, acidic dye, when using polyacrylonitrile fiber, cationic dye, when using cellulose fiber, disperse dye, cellulose When fibers are used, reactive dyes or direct dyes can be suitably used, but the present invention is not limited to these. As natural fibers, reactive dyes or direct dyes when cotton is used, acidic dyes when silk is used, reactive dyes or direct dyes when hemp is used, and acidic dyes when wool is used can be suitably used. However, it is not limited to these.

In the present invention, there is no particular limitation on the dye concentration and dyeing temperature, and a known method can be suitably employed. If necessary, scouring may be performed before the dyeing process, or reduction cleaning may be performed after the dyeing process.

The spun yarn obtained by the present invention and the fiber structure comprising the spun yarn are excellent in heat retention, quick drying and iron heat resistance as well as light weight. Therefore, women's clothing, men's clothing, lining, underwear, down, vest, inner, outerwear and other general clothing uses, windbreakers, outdoor wear, ski wear, golf wear, swimwear and other sports clothing use, futon side, futon Covers, blankets, blankets, blanket covers, pillowcases, sheets and other bedding applications, tablecloths, curtains, tile carpets, household rugs, automobile mats, interior applications, belts, bags, sewing threads, sleeping bags, tents , Materials such as ropes, curing nets, filter cloths, narrow tapes, braids, upholstery, etc., but are not limited thereto.

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

The raw material of the polymethylpentene fiber and the properties of the fiber were calculated by the methods A to K.

A. MFR
MFR (g / 10 min) was measured under the conditions of a measurement temperature of 260 ° C. and a load of 5.0 kg according to ASTM D1238-10 using a polymethylpentene resin as a sample. The measurement was performed 3 times per sample, and the average value was defined as MFR.

B. Water content Using the polymethylpentene resin and the thermoplastic resin after vacuum drying as samples, the water content (ppm) was measured using a trace moisture measuring device AQ-2000 and a moisture vaporizer EV-2000 manufactured by Hiranuma Sangyo. After putting the sample into the moisture vaporizer, the temperature of the heating furnace was measured at 180 ° C., and the flow rate of dry nitrogen gas was measured at 0.2 L / min. In addition, the measurement was performed 3 times per sample, and the average value was defined as the moisture content.

C. Melting | fusing point About polymethylpentene type-resin and thermoplastic resin, melting | fusing point was measured using the Perkin-Elmer differential scanning calorimeter (DSC) DSC7 type | mold. Under a nitrogen atmosphere, about 10 mg of the sample was heated from 30 ° C. to 280 ° C. at a rate of temperature increase of 15 ° C./min, and held at 280 ° C. for 3 minutes to remove the thermal history of the sample. Thereafter, the temperature was decreased from 280 ° C. to 30 ° C. at a temperature decrease rate of 15 ° C./min, and then held at 30 ° C. for 3 minutes. Furthermore, the temperature was raised from 30 ° C. to 280 ° C. at a rate of temperature rise of 15 ° C./min, and the peak temperature of the endothermic peak observed during the second temperature raising process was taken as the melting point (° C.). The measurement was performed three times for each sample, and the average value was taken as the melting point.

D. Composite ratio The composite ratio (weight ratio) was calculated from the weight of the polymethylpentene resin used as a raw material for the polymethylpentene fiber and the weight of the thermoplastic resin.

E. Specific gravity The specific gravity was calculated according to JIS L1015: 2010 (chemical fiber staple test method) 8.14.1 (floating and sinking method) using the polymethylpentene fiber obtained in the example as a sample. The measurement was performed 3 times per sample, and the average value was defined as the specific gravity.

F. Average fiber length Average fiber length (mm) was obtained by using polymethylpentene fibers obtained in the examples as samples, JIS L1015: 2010 (chemical fiber staple test method) 8.4.1 (staple diagram method (A method)) It calculated according to. The measurement was performed 20 times per sample, and the average value was defined as the average fiber length.

G. Single yarn fineness The single yarn fineness (dtex) was calculated according to JIS L1015: 2010 (chemical fiber staple test method) 8.5.1 (Method A) using the polymethylpentene fiber obtained in the example as a sample. . In addition, the measurement was performed 3 times per sample, and the average value was defined as the single yarn fineness.

H. Strength, Elongation Strength (cN / dtex) and elongation (%) were measured in accordance with JIS L1015: 2010 (chemical fiber staple test method) 8.7.1 using polymethylpentene fibers obtained in the examples as samples. Calculated. The tensile test was carried out using an autograph AG-50NISMS type manufactured by Shimadzu Corporation under the conditions of a grip interval of 20 mm and a tensile speed of 20 mm / min.

I. Initial tensile resistance The initial tensile resistance (cN / dtex) was calculated according to JIS L1015: 2010 (chemical fiber staple test method) 8.11, using the polymethylpentene fiber obtained in the examples as a sample. Measurement was performed in the same manner as in H above to draw a load-elongation curve, and the maximum point of load change with respect to elongation change was determined near the origin of this curve, and the method described in JIS L1015: 2010 (chemical fiber staple test method) 8.11 The initial tensile resistance was calculated using the formula.

J. et al. Crimp number The number of crimps (crest / 25 mm) was calculated according to JIS L1015: 2010 (chemical fiber staple test method) 8.12.1 using the polymethylpentene fiber obtained in the example as a sample.

K. Crimp rate The crimp rate (%) was calculated according to JIS L1015: 2010 (chemical fiber staple test method) 8.12.2 using the polymethylpentene fiber obtained in the example as a sample.

The fiber characteristics of the spun yarn were calculated by the methods L to S.

L. Melting point or decomposition temperature Using the chemical fiber or natural fiber used as the raw material of the spun yarn, the melting point was measured in the same manner as in C above. When the sample did not show a clear melting point, the decomposition temperature was measured using a Seiko Instruments thermogravimetric differential thermal analyzer (TG-DTA) Model 6200. In an air atmosphere, about 10 mg of the sample was heated from 30 ° C. to 500 ° C. at a heating rate of 10 ° C./min, and the temperature at which the weight of the sample decreased by 10% was taken as the decomposition temperature (° C.). The measurement was performed three times per sample, and the average value was taken as the decomposition temperature.

M.M. Blend ratio The blend ratio (weight ratio) was calculated from the weight of the polymethylpentene fiber used as the raw material for the spun yarn and the weight of the chemical fiber or natural fiber.

N. Apparent specific gravity The apparent specific gravity was measured in the same manner as E described above using the spun yarn obtained in the example as a sample.

O. English Cotton Count The English cotton count (count) was calculated according to JIS L1095: 2010 (general spun yarn test method) 9.4.2 using the spun yarn obtained in the example as a sample. In addition, the measurement was performed 3 times per sample, and the average value was defined as the single yarn fineness.

P. Tenacity, elongation Tenacity (cN) and elongation (%) were measured according to JIS L1095: 2010 (general spun yarn test method) 9.5.1 (standard time) using the spun yarn obtained in the examples as a sample. Calculated. The tensile test was carried out using an autograph AG-50NISMS type manufactured by Shimadzu Corporation under the conditions of a gripping interval of 50 cm and a tensile speed of 30 cm / min.

Q. Initial tensile resistance (cN / dtex) The initial tensile resistance (cN / dtex) was calculated according to JIS L1095: 2010 (general spun yarn test method) 9.13 using the spun yarn obtained in the example as a sample. Measurement was performed in the same manner as in P above to draw a load-elongation curve, and the maximum point of load change with respect to elongation change was determined near the origin of this curve, and the method described in JIS L1095: 2010 (General spinning yarn test method) 9.13 The initial tensile resistance was calculated using the formula.

R. The number of twists The number of twists (times / 25.4 mm) was calculated according to JIS L1095: 2010 (general spun yarn test method) 9.15.1 (Method A) using the spun yarn obtained in the example as a sample. .

S. Twisting coefficient The twisting coefficient K was calculated by the following formula using the twist number T (times / 25.4 mm) calculated in R and the English cotton count N (count) calculated in O.

Twisting coefficient K = T ÷ N ^1/2 .

T.A. The number of fluff was calculated according to JIS L1095: 2010 (general spun yarn test method) 9.22 (method B) using the spun yarn obtained in the example as a sample. The number of fluff was measured using F-INDEX TESTER manufactured by Shikishima Techno under the conditions of a sample length of 10 m and a yarn speed of 30 m / min, and the number of fluff of 3 mm or more was calculated. The measurement was performed 10 times per sample, and the average value was defined as the number of fluff.

The fabric characteristics of the spun yarn were calculated by the method of U to AF.

U. Apparent specific gravity The apparent specific gravity was measured in accordance with JIS L1096: 2010 (fabric and knitted fabric test method) 8.11, using the plain fabric obtained in the examples as a sample. The measurement was performed three times for each sample, and the average value was the apparent specific gravity.

V. Thermal insulation rate Thermal insulation rate (%) is based on JIS L1096: 2010 (fabric and knitted fabric test method) 8.27.1 (Method A (constant temperature method)) using the plain woven fabric obtained in the examples as a sample. It was measured.

W. Drying time Drying time (minutes) was measured according to JIS L1096: 2010 (fabric and knitted fabric test method) 8.25 using the plain fabric obtained in the examples as a sample.

X. Iron temperature Using the plain woven fabric (15 cm × 15 cm) obtained in the example as a sample, the surface of the woven fabric after applying an iron (Sanyo A-1F, surface pressure of about 8 g / cm ² ) heated to a set temperature for 15 seconds. The shape change was observed. When no change was observed in the shape of the fabric surface, the set temperature was increased by 10 ° C., and the maximum temperature at which the shape did not change was defined as the iron temperature (° C.). The set temperature of the iron was changed from 130 ° C to 210 ° C. In addition, the measurement was performed 3 times per sample, and the average value was used as the iron temperature.

Y. L ^* value When a polymethylpentene fiber and a thermoplastic resin are combined, or when a polymethylpentene fiber and a chemical fiber or a natural fiber are blended, the plain fabric obtained in the example is used as a sample, and scouring is performed at 70 ° C. For 20 minutes, followed by dry heat setting at 160 ° C. for 2 minutes and staining according to a conventional method. The L ^* value of the dyed sample was measured using a Minolta spectrophotometer CM-3700d model with a D65 light source, a viewing angle of 10 °, and an optical condition of SCE (regular reflection light removal method). In addition, the measurement was performed 3 times per sample, and the average value was defined as L ^* value. Further, when an original fiber was used as the polymethylpentene fiber, the L ^* value was measured in the same manner as described above. The specific staining method for each sample is as follows.

When polylactic acid (PLA), polyethylene terephthalate (PET), polypropylene terephthalate (PPT), cellulose acetate propionate (CAP) is used as the thermoplastic resin, and polyester fiber is used as the chemical fiber, Japan is a disperse dye. Kayalon Polyester Black EX-SF200 manufactured by Kayaku was used. The plain fabric was dyed with a dyeing solution added with 8% by weight of a dye and adjusted to pH 5.0, under conditions of a bath ratio of 1: 100 and a dyeing time of 60 minutes. The dyeing temperature was 100 ° C. for PLA, PPT, and CAP, and 130 ° C. for PET and polyester fibers.

When nylon 6 (N6) and nylon 66 (N66) were used as the thermoplastic resin, and wool was used as the natural fiber, Kayanol Milling Black TLB made by Nippon Kayaku, which is an acid dye, was used as the dye. Dye was added to the plain woven fabric by 8% by weight and dyed with a pH adjusted to 4.5 and dyed under the conditions of a bath ratio of 1: 100, a dyeing temperature of 100 ° C., and a dyeing time of 60 minutes.

When polymethyl methacrylate (PMMA) or maleic anhydride-modified polypropylene (MPP) was used as the thermoplastic resin, Kayacryl Black YA made by Nippon Kayaku, which is a cationic dye, was used as the dye. The plain fabric was dyed with a dyeing solution prepared by adding 8% by weight of a dye and adjusting the pH to 4.0 under the conditions of a bath ratio of 1: 100, a dyeing temperature of 100 ° C., and a dyeing time of 60 minutes.

When cellulose fiber was used as the chemical fiber and cotton as the natural fiber, Kayion Black CF-BG manufactured by Nippon Kayaku, which is a reactive dye, was used as the dye. Dye was added to the plain woven fabric by 8% by weight and dyed with a pH adjusted to 11.0.

Z. Lightness The apparent specific gravity of a plain woven fabric calculated by U was used as an indicator of lightness. The apparent specific gravity is “less than 0.25” A, “0.25 or more and less than 0.30” is B, “0.30 or more and less than 0.35” is C, “0.35 or more” is D, and “0 .25 or more and less than 0.30 "was regarded as passing.

AA. Heat retention The heat retention rate of the plain woven fabric calculated by V was used as an index of heat retention. The heat retention rate is “18% or more” A, “14% or more but less than 18%” B, “10% or more but less than 14%” C, “less than 10%” D, “14% or more but less than 18%” B or more of was regarded as passing.

AB. Quick-drying The drying time of a plain woven fabric calculated by the above W was used as an index for quick-drying. Drying time is “less than 100 minutes” A, “100 minutes to less than 300 minutes” B, “300 minutes to less than 500 minutes” C, “500 minutes or more” D, “100 minutes to less than 300 minutes” B or more of was regarded as passing.

AC. Iron heat resistance The iron temperature of the plain woven fabric calculated by the above X was used as an index of iron heat resistance. Iron temperature is “180 ° C. to 210 ° C.” A, “160 ° C. to 170 ° C.” B, “140 ° C. to 150 ° C.” C, “130 ° C.” is D, and “160 ° C. to 170 ° C.” B or higher of “° C. or lower” was regarded as acceptable.

AD. Color developability The L ^* value of plain fabric dyed with Y was used as an index of color developability. L ^{* The} value is “less than 40” as A, “40 or more but less than 50” as B, “50 or more but less than 60” as C, “60 or more” as D, and “40 or more but less than 50” as B or more as acceptable. .

AE. Texture The sensory test by 10 subjects was implemented about the plain fabric obtained by the Example. In the sensory test, the softness and quality of the plain fabric are evaluated by tentacles. “Excellent” is A, “Excellent” is B, “Normal” is C, “Inferior” is D, “Excellent” B or more "

AF. Fluffing The number of fluffs of the spun yarn obtained in the example was used as an index of fluffing. The number of fluff is "30 / less than 10m" A, "30 / 10m or more but less than 50 / 10m" B, "50 / 10m or more but less than 70 / 10m" C, "70 / 10m or more" Was set to D, and B or more of “30/10 m or more and less than 50/10 m” was determined to be acceptable.

(Example 1)
Pellets of polymethylpentene (PMP) (“DX820” manufactured by Mitsui Chemicals, melting point 232 ° C., MFR 180 g / 10 min) are vacuum-dried at 95 ° C. for 12 hours, and then supplied to an extruder type melt spinning machine for melting and spinning. A spun yarn was obtained by discharging from a spinneret (discharge hole diameter 0.3 mm, discharge hole length 0.6 mm, hole number 780, round hole) at a temperature of 280 ° C. The spun yarn is cooled with a cooling air of 20 ° C. and a cooling speed of 25 m / min. The oil agent is applied and converged by an oiling device, taken up by a roller rotating at 1000 m / min, and another spinning spindle and 36 pieces. After combining the yarns, the undrawn yarn was obtained by swinging it into the can and storing it. Thirty cans in which undrawn yarns were stored were lined up and 30 undrawn yarns were lined up, leading to a warm water bath at 90 ° C. and drawn at a draw ratio of 2.4 times. Subsequently, the crimper is crimped with a crimper of about 10 crests / 25 mm, dried at 130 ° C., and then applied with 0.5% by mass of the finishing oil to the fiber by a spray method. The polymethylpentene fiber was obtained by cutting to 64 mm.

The resulting polymethylpentene fiber was put into a card machine to make a sliver, and then 8 slivers were mixed with a drawing machine. Thereafter, roving was performed with a roving machine to obtain roving with a twist number of 0.5 times / 25.4 mm. This roving was supplied to a fine spinning machine to obtain a spun yarn with 18 twists / 25.4 mm and 20 English cotton count. Using the spun yarn thus obtained for warp and weft, a plain woven fabric having a warp density of 70 / 25.4 mm and a weft density of 70 / 25.4 mm was produced.

Table 1 shows the evaluation results of the fiber characteristics of the obtained polymethylpentene fiber, the fiber characteristics of the spun yarn, and the fabric characteristics. Since it is a woven fabric using spun yarn made of low specific gravity polymethylpentene fiber, it was extremely excellent in lightness. It was extremely excellent in heat retention and quick-drying, and also excellent in iron heat resistance. In addition, the texture was high in flexibility, extremely excellent quality, few occurrences of fluff, and the level of fluff was acceptable.

(Examples 2 to 4)
A polymethylpentene fiber, a spun yarn, and a plain fabric were produced in the same manner as in Example 1 except that the twist coefficient was changed as shown in Table 1.

Table 1 shows the evaluation results of the fiber characteristics of the obtained polymethylpentene fiber, the fiber characteristics of the spun yarn, and the fabric characteristics. Even when the twisting coefficient was changed, it was extremely excellent in lightness, heat retention and quick drying, and further excellent in iron heat resistance. Moreover, compared with Example 1, although the increase in the number of fluff is seen when making a twist coefficient small, it is a pass level, and when a twist coefficient is made large, a plain fabric does not harden | cure, and the quality which was extremely excellent in any case Met.

(Comparative Example 10), (Example 6)
A polymethylpentene fiber, spun yarn and plain fabric were produced in the same manner as in Example 1 except that the single yarn fineness was changed as shown in Table 1.
The evaluation results of the fiber characteristics of the obtained polymethylpentene fiber, the fiber characteristics of the spun yarn, and the fabric characteristics are shown in Table 1. Compared to Example 1, in Comparative Example 10, although the single yarn fineness was reduced, the lightness, heat retention, and quick drying were improved. However, the increase in the number of fluffs did not reach the acceptable level. In Example 6, all fabric characteristics were acceptable levels.

(Examples 7 to 10)
In Examples 7 and 8, the cut length when cutting the polymethylpentene fiber was 38 mm and 120 mm, respectively, and in Examples 9 and 10, the number of crimps when crimping the polymethylpentene fiber was about 5 peaks / A polymethylpentene fiber, a spun yarn, and a plain woven fabric were produced in the same manner as in Example 1 except that the width was changed to 25 mm and about 25 crests / 25 mm.

Table 2 shows the evaluation results of the fiber characteristics of the obtained polymethylpentene fiber, the fiber characteristics of the spun yarn, and the fabric characteristics. Even when the average fiber length and the number of crimps were changed, all the fabric characteristics were acceptable levels.

(Examples 11 and 12)
Polymethylpentene fibers, spun yarns and plain fabrics were produced in the same manner as in Example 1 except that the English cotton count was changed to 10th and 100th, respectively, during spinning.

Table 2 shows the evaluation results of the fiber characteristics of the obtained polymethylpentene fiber, the fiber characteristics of the spun yarn, and the fabric characteristics. Compared with Example 1, in Example 11, although the English cotton count was reduced, the lightness was slightly lowered, but it was a pass level. Regarding other fabric characteristics, both Examples 11 and 12 were acceptable levels.

(Example 13)
Except that the spinneret was changed to a Y-type die (slit width 0.08 mm, slit length 0.2 mm, discharge hole length 0.6 mm, number of holes 780, Y hole) in Example 7, the same as in Example 1 Polymethylpentene fiber, spun yarn and plain fabric were prepared.

Table 2 shows the evaluation results of the fiber characteristics of the obtained polymethylpentene fiber, the fiber characteristics of the spun yarn, and the fabric characteristics. Compared to Example 1, in Example 7, the fiber cross section was changed to the Y cross section, so that the heat retaining property and quick drying property were improved. Moreover, the iron heat resistance was also good, and the lightness and texture were extremely excellent. Furthermore, the fuzz was also acceptable.

(Examples 14 to 21)
Polymethylpentene fiber, spun yarn and plain fabric were produced in the same manner as in Example 1 except that pellets made of polymethylpentene resin and thermoplastic resin produced by the following method were used and the spinning temperature was changed.

Mixing ratio of polymethylpentene (PMP) (“DX820” manufactured by Mitsui Chemicals, melting point 232 ° C., MFR 180 g / 10 min) 90 wt%, thermoplastic resin 10 wt%, kneading temperature 260 using a biaxial extruder Kneading was performed at 0 ° C. The strand discharged from the biaxial extruder was water-cooled and then cut into a length of about 5 mm with a pelletizer to obtain a pellet. In Example 14, as a thermoplastic resin, polylactic acid (PLA) (melting point: 168 ° C., weight average molecular weight: 145,000), and in Example 15, polyethylene terephthalate (PET) (Toray “T701T”, melting point: 257 ° C.), Example No. 16 is polypropylene terephthalate (PPT) (“Corterra CP513000” manufactured by Shell, melting point 225 ° C.), Nylon 6 (N6) (Toray “Amilan CM1017”, melting point 225 ° C.) is used in Example 17, Nylon 66 (N66 ) (Toray “CM3001-N”, melting point 265 ° C.), Example 19 is polymethyl methacrylate (PMMA) (Mitsubishi Rayon “Acrypet VH000”, melting point 140 ° C.), Example 20 is maleic anhydride-modified polypropylene ( MPP) ("Yomex 1010" manufactured by Sanyo Chemical Industries, melting point 1 2 ° C.), was used in Example 21 in a cellulose acetate propionate (CAP) (manufactured by Eastman Chemical "CAP-482-20", melting point 195 ° C.). The spinning temperature was 260 ° C. in Examples 14, 16, 17, 19 to 21, and 290 ° C. in Examples 15 and 18.

Table 3 shows the evaluation results of the fiber characteristics of the obtained polymethylpentene fiber, the fiber characteristics of the spun yarn, and the fabric characteristics. When combined with any thermoplastic resin, the lightness of the plain woven fabric was acceptable without impairing the lightness of the polymethylpentene resin. In addition, all of the heat retaining properties, quick drying properties and fuzzing were acceptable levels. In Examples 14 and 19 to 21, the melting point of the thermoplastic resin was lower than 200 ° C., but since the thermoplastic resin was finely dispersed in the polymethylpentene resin, the iron heat resistance was also acceptable. Further, since the thermoplastic resin having high color developability is finely dispersed in the polymethylpentene resin having a low refractive index, the entire plain woven fabric is dyed uniformly and clearly, and the color developability is also excellent. In addition, the texture was very flexible and extremely excellent.

(Examples 30 and 31)
Polymethylpentene (PMP) (Mitsui Chemicals “DX820”, melting point 232 ° C., MFR 180 g / 10 min) 80% by weight, carbon black 20% by weight, kneading temperature 260 ° C. using a biaxial extruder Kneading was performed. The strand discharged from the biaxial extruder was water-cooled and then cut into a length of about 5 mm by a pelletizer to obtain a master batch.

The pellets and master batch of polymethylpentene (PMP) (Mitsui Chemicals “DX820”, melting point 232 ° C., MFR 180 g / 10 min) were vacuum-dried at 95 ° C. for 12 hours, and then discharged from the main feeder of the extruder type melt spinning machine. Polymethylpentene fiber, spun yarn, and plain fabric were produced in the same manner as in Example 1 except that methylpentene was supplied and a master batch was supplied from the sub-feeder. In Example 30, the blending ratio of 97.5% by weight of polymethylpentene and 2.5% by weight of the master batch was set to 0.5% by weight of carbon black in the obtained polymethylpentene fiber. The blending ratio was 75% by weight of polymethylpentene, 25% by weight of the master batch, and 5% by weight of carbon black in the resulting polymethylpentene fiber.

Table 3 shows the evaluation results of the fiber characteristics of the obtained polymethylpentene fiber, the fiber characteristics of the spun yarn, and the fabric characteristics. Since an original fiber made of carbon black was used as the polymethylpentene fiber, the color development of the spun yarn was extremely good. Regarding the other fabric characteristics, both Examples 30 and 31 were acceptable levels.

(Examples 22 to 29)
Using the polymethylpentene fiber obtained in Example 1, in Examples 22 to 24, polyethylene terephthalate fiber (round cross section, average fiber length 51 mm, single yarn fineness 1.7 dtex), in Example 25 viscose rayon fiber ( Average fiber length 51 mm, single yarn fineness 1.7 dtex), Examples 26-28 cotton (rice cotton, average fiber length 25.4 mm, single yarn fineness 2.3 dtex), Example 29 wool (merino wool, average fiber) 64 mm long, single yarn fineness 5.5 dtex). Polymethylpentene fiber and chemical fiber or natural fiber were put into a card machine at a blending ratio shown in Table 4 to form a sliver, and then a spun yarn and a plain fabric were produced in the same manner as in Example 1.

Table 4 shows the evaluation results of the fiber properties of the obtained polymethylpentene fibers, the fiber properties of the spun yarn, and the fabric properties. In Examples 22 to 24, as the blending ratio of the polyethylene terephthalate fiber increased, the apparent specific gravity increased, the heat retention ratio decreased, and the drying time tended to increase, but the lightness, heat retention, quick drying property, The iron heat resistance, texture, and fluffing were all acceptable. The L ^* value decreased with an increase in the blend ratio of the polyethylene terephthalate fiber, and the color developability improved. In the case of blending with cotton in Examples 26 to 28, as the blend ratio of cotton increased, the same tendency as in Examples 22 to 24 was observed in all fabric characteristics, which was acceptable levels. Also when blended with viscose rayon in Example 25 and wool in Example 29, all fabric properties were acceptable levels.

(Examples 32 to 34)
After the polymethylpentene fiber obtained in Example 1 and the polyethylene terephthalate fiber (round cross section, average fiber length 51 mm, single yarn fineness 1.7 dtex) were put into a card machine at a blending ratio shown in Table 5 to make a sliver A spun yarn and a plain fabric were produced in the same manner as in Example 1.

Table 5 shows the evaluation results of the fiber characteristics of the obtained polymethylpentene fiber, the fiber characteristics of the spun yarn, and the fabric characteristics. As the blending ratio of polyethylene terephthalate fiber decreases, the apparent specific gravity decreases, the heat retention rate improves, and the drying time tends to be shortened. All were acceptable levels.

(Examples 35 to 40)
After the polymethylpentene fiber obtained in Example 31 and the polyethylene terephthalate fiber (round cross section, average fiber length 51 mm, single yarn fineness 1.7 dtex) were put into a card machine at a blending ratio shown in Table 5 to make a sliver A spun yarn and a plain fabric were produced in the same manner as in Example 1.

Table 5 shows the evaluation results of the fiber characteristics of the obtained polymethylpentene fiber, the fiber characteristics of the spun yarn, and the fabric characteristics. Since an original fiber made of carbon black was used as the polymethylpentene fiber, the color development of the spun yarn was extremely good. In addition, as the blending ratio of polyethylene terephthalate fibers decreases, the apparent specific gravity decreases, the heat retention rate improves, and the drying time tends to be shortened, lightness, heat retention, quick drying, iron heat resistance, texture, It was a pass level in all of the fuzz.

(Comparative Examples 1 and 2)
A polymethylpentene fiber, spun yarn and plain fabric were produced in the same manner as in Example 1 except that the single yarn fineness was changed as shown in Table 5.

Table 5 shows the evaluation results of the fiber characteristics of the obtained polymethylpentene fiber, the fiber characteristics of the spun yarn, and the fabric characteristics. In Comparative Examples 1 and 2, the lightness, heat retention, quick drying, and iron heat resistance were acceptable levels. However, in Comparative Example 1, since the single yarn fineness was small, the occurrence of fluff was extremely large, and the texture was very poor. In Comparative Example 2, since the single yarn fineness was large, the plain fabric lacked flexibility and had a very inferior texture.

(Comparative Examples 3 and 4)
A polymethylpentene fiber, a spun yarn, and a plain fabric were produced in the same manner as in Example 1 except that the twist coefficient was changed as shown in Table 5.

Table 5 shows the evaluation results of the fiber characteristics of the obtained polymethylpentene fiber, the fiber characteristics of the spun yarn, and the fabric characteristics. In Comparative Examples 3 and 4, the lightness, heat retention, quick drying and iron heat resistance were acceptable levels. However, in Comparative Example 3, since the twisting coefficient was small, the occurrence of fluff was observed, and the texture was slightly inferior. In Comparative Example 4, since the twist coefficient was large, the plain woven fabric was cured, and the texture was not flexible. In addition, a lot of fluff was observed, and it did not reach a passing level.

(Comparative Examples 5 to 8)
In Comparative Example 5, polypropylene fiber (round cross section, average fiber length 51 mm, single yarn fineness 1.7 dtex), in Comparative Example 6, polyethylene terephthalate fiber (round cross section, average fiber length 51 mm, single yarn fineness 1.7 dtex), Comparative Example 7 In Example 1, cotton (rice cotton, average fiber length 25.4 mm, single yarn fineness 2.3 dtex) was used in Comparative Example 8, and wool (merino wool, average fiber length 64 mm, single yarn fineness 5.5 dtex) was used. Similarly, spun yarn and plain fabric were produced.

Table 5 shows the evaluation results of the fiber characteristics and fabric characteristics of the obtained spun yarn. Although the comparative example 5 showed extremely excellent lightness, heat retention, quick drying, and texture, the iron heat resistance was extremely low due to the low melting point of polypropylene. In addition, the fluffing did not reach a passing level. In Comparative Example 6, the properties other than lightness were excellent, but the specific gravity of polyethylene terephthalate was high, so that the lightness was lacking. In Comparative Example 7, since the specific gravity of cotton was high, the weight was inferior, and the heat conductivity was high, so that the heat retaining property was insufficient. In addition, the drying time was long, and the quick drying property was slightly inferior, and the fluffing did not reach a passing level. In Comparative Example 8, since the specific gravity of wool was high, the lightness was low, the drying time was extremely long, and the quick drying property was inferior. In addition, the fluffing did not reach a passing level.

(Comparative Example 9)
Pellets of polymethylpentene (PMP) (Mitsui Chemicals “DX820”, melting point 232 ° C., MFR 180 g / 10 min) and polypropylene (PP) (Nippon Polypro “Novatech FY6”, melting point 170 ° C.) are vacuumed at 95 ° C. for 12 hours. After drying, it is supplied to a pressure melter type melt spinning machine at a blending ratio of 50% by weight of polymethylpentene and 50% by weight of polypropylene and melted separately, and a spinneret (discharge hole diameter 0.3 mm, A spun yarn was obtained by discharging from a discharge hole length of 0.6 mm, a hole number of 780, a radial type round hole: 16 divisions). The spun yarn is cooled with a cooling air of 20 ° C. and a cooling speed of 25 m / min. The oil agent is applied and converged by an oiling device, taken up by a roller rotating at 1000 m / min, and another spinning spindle and 36 pieces. After combining the yarns, the undrawn yarn was obtained by swinging it into the can and storing it. Thirty cans in which undrawn yarns were stored were lined up and 30 undrawn yarns were lined up, leading to a warm water bath at 90 ° C. and drawn at a draw ratio of 2.4 times. Subsequently, the crimper is crimped with a crimper of about 10 crests / 25 mm, dried at 130 ° C., and then applied with 0.5% by mass of the finishing oil to the fiber by a spray method. After cutting to 100 mm, a split type composite fiber composed of polymethylpentene fibers, that is, polymethylpentene and polypropylene, and capable of 16 splitting was obtained. The single yarn fineness of the split type composite fiber was 3.3 dtex.

The resulting split composite fiber was put into a card machine to make a sliver, and then 8 slivers were mixed with a drawing machine. Thereafter, roving was performed with a roving machine to obtain roving with a twist number of 0.5 times / 25.4 mm. The roving was supplied to a spinning machine to obtain a spun yarn having a twist number of 4 / 25.4 mm and an English cotton count of 20th. Subsequently, the obtained spun yarn is run at a speed of 0.5 m / min between rollers having a V-shaped spiral groove, and a high pressure liquid flow jetting apparatus having a plurality of jetting holes having a nozzle diameter of 0.5 mm from above. Thus, a water flow having a water pressure of 6.0 MPa was jetted onto the spun yarn, and the split type composite fiber constituting the spun yarn was divided. The spun yarn after the split treatment was composed of polymethylpentene fiber having a single yarn fineness of 0.2 dtex and polypropylene fiber having a single yarn fineness of 0.2 dtex in a weight ratio of 50:50. By using the spun yarn obtained by the division treatment as warp and weft, a plain woven fabric having a warp density of 70 / 25.4 mm and a weft density of 70 / 25.4 mm was produced.

Table 5 shows the evaluation results of the fiber characteristics of the obtained polymethylpentene fiber, the fiber characteristics of the spun yarn, and the fabric characteristics. Lightness, heat retention, and quick drying were acceptable levels. However, since the single yarn fineness of the polymethylpentene fiber and the polypropylene fiber constituting the spun yarn is small, the occurrence of fluff was extremely large and the texture was very inferior. In addition, since the single yarn fineness is small, the heat of the iron is easily transmitted to the spun yarn, and as a result of being strongly influenced by polypropylene which is inferior in heat resistance to polymethylpentene, the iron heat resistance is extremely low.

(Comparative Example 11)
Pellets of polymethylpentene (PMP) (Mitsui Chemicals “DX820”, melting point 232 ° C., MFR 180 g / 10 min) and polypropylene (PP) (Nippon Polypro “Novatech FY6”, melting point 170 ° C.) are vacuumed at 95 ° C. for 12 hours. After drying, it is supplied to a pressure melter type melt spinning machine at a blending ratio of 50% by weight of polymethylpentene and 50% by weight of polypropylene and melted separately, and a spinneret (discharge hole diameter 0.3 mm, A spun yarn was obtained by discharging from a discharge hole length of 0.6 mm, a hole number of 780, a core-sheath type round hole, a core: polypropylene, and a sheath: polymethylpentene). The spun yarn is cooled with a cooling air of 20 ° C. and a cooling speed of 25 m / min. The oil agent is applied and converged by an oiling device, taken up by a roller rotating at 1000 m / min, and another spinning spindle and 36 pieces. After combining the yarns, the undrawn yarn was obtained by swinging it into the can and storing it. Thirty cans in which undrawn yarns were stored were lined up and 30 undrawn yarns were lined up, leading to a warm water bath at 90 ° C. and drawn at a draw ratio of 2.4 times. Subsequently, the crimper is crimped with a crimper of about 10 crests / 25 mm, dried at 130 ° C., and then applied with 0.5% by mass of the finishing oil to the fiber by a spray method. Cut to 51 mm to obtain a polymethylpentene fiber, that is, a core-sheath type composite fiber made of polymethylpentene and polypropylene.

After the obtained core-sheath type composite fiber was put into a card machine to make a sliver, 8 slivers were mixed with a drawing machine. Thereafter, roving was performed with a roving machine to obtain roving with a twist number of 0.5 times / 25.4 mm. This roving yarn was supplied to a fine spinning machine to obtain a spun yarn having a twist number of 18 / 25.4 mm and an English cotton count of 30. Using the spun yarn thus obtained for warp and weft, a plain woven fabric having a warp density of 70 / 25.4 mm and a weft density of 70 / 25.4 mm was produced.

Table 5 shows the evaluation results of the fiber characteristics of the obtained polymethylpentene fiber, the fiber characteristics of the spun yarn, and the fabric characteristics. Lightness, heat retention, and quick drying were acceptable levels. However, since the heat resistance of the polypropylene disposed in the core portion is low, a shape change was observed on the surface of the fabric after the iron was applied, and the iron heat resistance did not reach an acceptable level. In addition, the spun yarn obtained had a very inferior texture with the occurrence of fluff due to sheath cracks being extremely large.

The spun yarn of the present invention is excellent in heat retention, quick drying and iron heat resistance as well as lightness. Therefore, it can be suitably used as a fiber structure such as a woven or knitted fabric or a nonwoven fabric.

Claims

60% by weight or more of the constituent component is a polymethylpentene resin and contains polymethylpentene fiber having a single yarn fineness of 2 to 20 dtex, the number of twists is T (times / 25.4 mm), English A spun yarn having a twist coefficient K calculated by the following formula (I) of 1.3 to 6.5, where N is the cotton count.
(I) K = T ÷ N 1/2
The spun yarn according to claim 1, wherein the polymethylpentene fiber is a fiber comprising a thermoplastic resin different from the polymethylpentene resin in the polymethylpentene resin.
The spun yarn according to claim 1 or 2, wherein the polymethylpentene fiber has an average fiber length of 10 to 100 mm.
The spun yarn according to any one of claims 1 to 3, wherein the polymethylpentene fiber is mixed with a chemical fiber or a natural fiber.
When the polymethylpentene fiber is (A) and the chemical fiber or the natural fiber is (B), the blend ratio (weight ratio) of (A) and (B) is A / B = 85/15 The spun yarn of claim 4, wherein the spun yarn is -97/3.
The spun yarn according to any one of claims 1 to 5, having an apparent specific gravity of 0.83 to 1.2.
The spun yarn according to any one of claims 4 to 6, wherein the melting point or decomposition temperature of the chemical fiber or the natural fiber is 200 ° C or higher.
The chemical fiber according to any one of claims 4 to 7, wherein the chemical fiber is at least one fiber selected from the group consisting of a polyester fiber, a polyamide fiber, a polyacrylonitrile fiber, a cellulosic fiber, and a cellulose fiber. Spun yarn.
The spun yarn according to any one of claims 4 to 8, wherein the natural fiber is at least one fiber selected from the group consisting of cotton, silk, hemp, and wool.
A fiber structure using at least a part of the spun yarn according to any one of claims 1 to 9.