JP2009209478A - Ultrafine drawn yarn having antistatic property and method for producing the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a polyester extra fine drawn yarn for obtaining a polyester fabric that maintains performance such as a soft feeling, moisture retaining property, water absorption, moisture absorption property, or the like which a conventional extra fine drawn yarn has and excellent antistatic performance, and to provide a method for stably producing the same. <P>SOLUTION: The antistatic sheath-core polyester extra fine drawn yarn satisfying specific requirements includes a sheath-core conjugate fiber in which the core part is made of an antistatic polyester A containing a specific antistatic agent represented by the following formula: Z-[(CH<SB>2</SB>CH<SB>2</SB>O)n(R<SP>1</SP>O)m-R<SP>2</SP>]k (wherein Z is a 1-6C active hydrogen atom-containing organic compound residue; R<SP>1</SP>is an alkylene group or substituted alkylene group having a carbon number not less than 6; R<SP>2</SP>is a hydrogen atom, a 1-40C monovalent hydrocarbon group, a 2-40C monofunctional hydroxy hydrocarbon or a 2-40C monovalent acyl group ; k is an integer of 1-6; n is an integer satisfying n ≥70/k; and m is an integer not less than 1), and the sheath part is composed of a polyester B containing 0-10 wt.% of a matting agent. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a polyester ultrafine drawn yarn having antistatic properties and a method for producing the same. More specifically, the present invention relates to a production method capable of stably obtaining a polyester extra fine drawn yarn having antistatic properties excellent in durability.

Extra-fine polyester drawn yarns are widely used in clothing and other applications because they provide a soft texture when made into a fabric and improve performance such as heat retention, water absorption, and moisture absorption.
However, in recent years, there has been an increasing demand for the texture, texture, appearance, etc. of woven and knitted fabrics. With fabrics knitted and woven using conventional ultra-fine polyester drawn yarn, a soft texture is obtained, and heat retention, Although performances such as water absorption and hygroscopicity are improved, fabrics having antistatic properties such as suppressing crackling static electricity have not been sufficient enough to say that none is equal.

  Regarding antistatic polyester yarns, attempts have been made to impart hydrophilicity to polyester to develop antistatic properties, and many proposals have been made so far. For example, a method of blending a polyester with a polyoxyalkylene-based polyether compound (Patent Document 1), and a method of blending a polyester with a substantially incompatible polyoxyalkylene-based polyether compound and an organic / inorganic ionic compound (Patent Literature 2, Patent Literature 3, Patent Literature 4, Patent Literature 5, Patent Literature 6, Patent Literature 7, Patent Literature 8, etc.) are known.

  Although it is possible to impart anti-static properties, however, in ultra-fine yarns of 1.5 dtex or less, there are frequent breaks and fluffs in the yarn making process due to variations in core / sheath formation and variations in single yarn fineness. In fact, there is nothing that satisfies the antistatic property with fineness.

Japanese Examined Patent Publication No. 39-5214 Japanese Examined Patent Publication No. 44-31828 Japanese Patent Publication No. 60-11944 JP-A-53-80497 JP-A-53-149247 JP 60-39413 A JP-A-3-139556 JP-A-4-146215

  As is apparent from the above, the object of the present invention is to maintain the soft texture, heat retention, water absorption, hygroscopicity, etc. of the conventional ultra fine polyester drawn yarn, and is excellent in antistatic performance. An object of the present invention is to provide a polyester extra fine drawn yarn capable of obtaining a polyester fabric and a method for stably producing the same.

It is a core-sheath type composite fiber, the core part is formed of antistatic polyester A, and the sheath part is formed of polyester B containing 0-10 wt% matting agent, and the following (1) to (5) This is achieved by an antistatic core-sheath polyester extra fine drawn yarn that satisfies the conditions.
(1) The single yarn fineness of the drawn yarn is 1.5 dtex or less.
(2) The ratio A: B between the area A of the core and the area B of the sheath is in the range of 5:95 to 80:20.
(3) The strength of the drawn yarn is 3.0 cN / dtex or more.
(4) The frictional voltage of the drawn yarn is 2000 V or less. (5) The antistatic polyester A is used as an antistatic agent with respect to 100 parts by weight of the aromatic polyester.
(A) 0.2 to 30 parts by weight of a polyoxyalkylene polyether represented by the following formula and (b) 0.05 to 10 parts by weight of an organic ionic compound substantially nonreactive with the polyester It must be an antistatic polyester.
^{_{Z - [(CH 2 CH 2}} O) n (R 1 O) m-R 2] k
[Wherein, Z is an organic compound residue having 1 to 6 active hydrogen atoms, R ¹ is an alkylene group or substituted alkylene group having 6 or more carbon atoms, R ² is a hydrogen atom, having 1 to 40 carbon atoms. A monovalent hydrocarbon group, a monovalent hydroxy hydrocarbon having 2 to 40 carbon atoms or a monovalent acyl group having 2 to 40 carbon atoms, k is an integer of 1 to 6, and n is n ≧ 70 / k. Satisfied integer, m is an integer of 1 or more]
as well as,
An antistatic core-sheath polyester having a spinning speed of 2000 to 4500 m / min and a ratio of discharge speed and take-up speed during spinning (hereinafter referred to as draft ratio) in the range of 100 to 800. A method for producing an ultrafine drawn yarn is provided.

  The antistatic ultrafine polyester drawn yarn of the present invention is extremely useful because it is soft and supple and exhibits antistatic properties even in a low temperature or dry environment. In addition, the antistatic property is not affected by repeated washing processes.

Hereinafter, embodiments of the present invention will be described in detail.
The polyester referred to in the present invention is an aromatic polyester having an aromatic ring in the polymer chain unit, and is obtained by reacting a bifunctional aromatic carboxylic acid or its ester-forming derivative with a diol or its ester-forming derivative. It is intended to be a polymer.

Examples of the bifunctional aromatic carboxylic acid herein include terephthalic acid, isophthalic acid, orthophthalic acid, 1,5-naphthalenedicarboxylic acid, 2,5-naphthalenedicarboxylic acid, 2,6-naphthalenedicarboxylic acid, 4,4′- Biphenyl dicarboxylic acid, 3,3'-biphenyl dicarboxylic acid, 4,4'-biphenyl ether dicarboxylic acid, 4,4'-biphenylmethane dicarboxylic acid, 4,4'-biphenyl sulfone dicarboxylic acid, 4,4'-biphenyl isopropyl Redene dicarboxylic acid, 1,2-bis (phenoxy) ethane-4,4'-dicarboxylic acid, 2,5-anthracene dicarboxylic acid, 2,6-anthracene dicarboxylic acid, 4,4'-p-phenylenedicarboxylic acid, 2 , 5-Pyridinedicarboxylic acid, β-hydroxyethoxybenzoic acid, p-oxybenzoic acid Etc. can be mentioned, in particular, terephthalic acid is preferred.
Two or more of these difunctional aromatic carboxylic acids may be used in combination. In addition, in a small amount, these bifunctional aromatic carboxylic acids and bifunctional aliphatic carboxylic acids such as adipic acid, azelaic acid, sebacic acid and dodecanedioic acid, and bifunctional alicyclic carboxylic acids such as cyclohexanedicarboxylic acid are used. An acid, 5-sodium sulfoisophthalic acid, etc. can be used alone or in combination of two or more.

  Examples of diol compounds include ethylene glycol, propylene glycol, butylene glycol, hexylene glycol, neopentyl glycol, aliphatic diols such as 2-methyl-1,3-propanediol, diethylene glycol and trimethylene glycol, and 1,4-cyclohexane. Preferable examples include alicyclic diols such as dimethanol and mixtures thereof. If the amount is small, polyoxyalkylene glycol having both ends or one end unblocked can be copolymerized with these diol compounds.

  Furthermore, polycarboxylic acids such as trimellitic acid and pyromellitic acid, and polyols such as glycerin, trimethylolpropane, and pentaerythritol can be used as long as the polyester is substantially linear.

  Specific preferred aromatic polyesters include polyethylene terephthalate, polybutylene terephthalate, polyhexylene terephthalate, polyethylene naphthalate, polybutylene naphthalate, polyethylene-1,2-bis (phenoxy) ethane-4,4'-dicarboxylate. In addition, there may be mentioned copolyesters such as polyethylene isophthalate / terephthalate, polybutylene terephthalate / isophthalate, polybutylene terephthalate / decane dicarboxylate, and the like. Of these, polyethylene terephthalate and polybutylene terephthalate having a good balance of mechanical properties and moldability are particularly preferable.

  Such aromatic polyester is synthesized by any method. For example, for polyethylene terephthalate, terephthalic acid and ethylene glycol are directly esterified, or a lower alkyl ester of terephthalic acid such as dimethyl terephthalate is transesterified with ethylene glycol, or terephthalic acid and ethylene oxide are reacted. In the first stage reaction to produce a glycol ester of terephthalic acid and / or a low polymer thereof, and then the product is heated under reduced pressure to undergo a polycondensation reaction until the desired degree of polymerization is reached. It is easily produced by a stage reaction.

The polyoxyalkylene polyether (a) to be blended in the composition of the present invention may be a polyoxyalkylene glycol composed of a single oxyalkylene unit as long as it is substantially insoluble in polyester. It may be a copolymerized polyoxyalkylene glycol comprising the above oxyalkylene units, and the following formula (1),
^{_{Z - [(CH 2 CH 2}} O) n (R 1 O) m-R 2] k (1)
[Wherein Z is an organic compound residue having 1 to 6 active hydrogen atoms, R1 is an alkylene group or substituted alkylene group having 6 or more carbon atoms, R2 is a hydrogen atom, monovalent having 1 to 40 carbon atoms, Hydrocarbon group, monovalent hydroxy hydrocarbon having 2 to 40 carbon atoms or monovalent acyl group having 2 to 40 carbon atoms, k is an integer of 1 to 6, and n satisfies n ≧ 70 / k. An integer, m is an integer of 1 or more] is preferred.

Specific examples of such polyoxyalkylene polyether include polyoxyethylene glycol having a molecular weight of 4000 or more, polyoxypropylene glycol having a molecular weight of 1000 or more, polyoxytetramethylene glycol, ethylene oxide having a molecular weight of 2000 or more, and a propylene oxide copolymer. Polymers, trimethylolpropane ethylene oxide adducts having a molecular weight of 4000 or more, nonylphenol ethylene oxide adducts having a molecular weight of 3000 or more, and compounds in which a substituted ethylene oxide having 6 or more carbon atoms is added to the terminal OH group. However, polyoxyethylene glycol having a molecular weight of 10,000 to 100,000 and an alkyl group having 8 to 40 carbon atoms at both ends of the polyoxyethylene glycol having a molecular weight of 5000 to 16000. Compound conversion of ethylene oxide are added are preferred.
The compounding amount of the polyoxyalkylene polyether compound is in the range of 0.2 to 30 parts by weight with respect to 100 parts by weight of the aromatic polyester. When the amount is less than 0.2 parts by weight, the hydrophilicity is insufficient and sufficient antistatic property cannot be exhibited. On the other hand, even if the amount exceeds 30 parts by weight, the antistatic effect is no longer recognized, but the mechanical properties of the resulting composition are deteriorated, and the polyether is easily bleed out, so that it is melt molded. In some cases, the insertability of the chip into the ruder is reduced, and the molding stability is also deteriorated.

  In particular, an organic ionic compound is blended in the polyester composition of the present invention in order to improve antistatic properties. Preferred examples of the organic ionic compound include sulfonic acid metal salts and sulfonic acid quaternary phosphonium salts represented by the following general formulas (2) and (3).

RSO ₃ M (2)
In the formula, R represents an alkyl group having 3 to 30 carbon atoms or an aryl group having 7 to 40 carbon atoms, and M represents an alkali metal or an alkaline earth metal. In the above formula (2), when R is an alkyl group, the alkyl group may be linear or have a branched side chain. M is an alkali metal such as Na, K, Li or the like, or an alkaline earth metal such as Mg, Ca. Among them, Li, Na, K are preferable. Such sulfonic acid metal salts may be used alone or in combination of two or more. Preferred examples include sodium stearyl sulfonate, sodium octyl sulfonate, sodium dodecyl sulfonate, a mixture of sodium alkyl sulfonate having an average of 14 carbon atoms, a mixture of sodium dodecyl benzene sulfonate, sodium dodecyl benzene sulfonate (hard type) Soft type), lithium dodecylbenzenesulfonate (hard type, soft type), magnesium dodecylbenzenesulfonate (hard type, soft type) and the like.

RSO ₃ PR ¹ R ² R ³ R ⁴ (3)
In the formula, R is the same as the definition of R in the above formula (2), and R ¹ , R ² , R ³ and R ⁴ are preferably an alkyl group or an aryl group, particularly a lower alkyl group, a phenyl group or a benzyl group. . Such sulfonic acid quaternary phosphonium salts may be used alone or in combination of two or more. Preferred examples include tetrabutylphosphonium alkyl sulfonate having an average of 14 carbon atoms, tetraphenyl phosphonium alkyl sulfonate having an average of 14 carbon atoms, and butyl alkyl sulfonate having an average of 14 carbon atoms. Triphenylphosphonium, tetrabutylphosphonium dodecylbenzenesulfonate (hard type, soft type), tetraphenylphosphonium dodecylbenzenesulfonate (hard type, soft type), benzyltriphenylphosphonium dodecylbenzenesulfonate (hard type, soft type), etc. Can give.

  Such organic ionic compounds may be used alone or in combination of two or more thereof, and the blending amount thereof is preferably in the range of 0.05 to 10 parts by weight with respect to 100 parts by weight of the aromatic polyester. If the amount is less than 0.05 parts by weight, the effect of improving antistatic properties is small. If the amount exceeds 10 parts by weight, the mechanical properties of the composition are impaired, and the ionic compound also tends to bleed out. As a result, the insertability of the chip of the chip decreases, and the molding stability also deteriorates.

  Polyester B is blended with a known matting agent as long as the object of the present invention is not impaired. If the matting agent exceeds 10 wt%, the spinnability of the undrawn yarn that becomes the parent yarn of the present invention is deteriorated, so the range is preferably 0 to 10 wt%.

  Furthermore, the area ratio of polyester A and polyester B needs to be in the range of 5:95 to 80:20. When the area ratio is smaller than 5:95, the expression of the antistatic performance by the polyester A becomes insufficient. When the area ratio is larger than 80:20, when the alkali weight loss of 10% or more is applied, The antistatic polyester is eluted, the antistatic performance is lowered and the strength of the drawn yarn is reduced to 3.0 cN / dtex or less, and the strength when used as a fabric is insufficient. This is not suitable for the purpose of use and is not preferable because the use is limited. More preferably, it is 5: 95-50: 50, More preferably, it is 10: 90-40: 60.

  Further, the aromatic polyester of the core and sheath of the antistatic polyester fiber of the present invention may be blended with an antioxidant, a heat stabilizer, an ultraviolet absorber, etc., and it is preferable to do so. is there. In addition, you may mix | blend a flame retardant, a fluorescent whitening agent, the matting 1 coloring agent, an inert fine particle, and other arbitrary additives as needed.

  Antioxidant suppresses thermal decomposition of the polyoxyalkylene polyether polymer due to high temperature, low discharge speed, and long-term residence in fiber melt spinning process, etc. It is possible to prevent the deterioration of the property. The antioxidant used in the present invention is not limited as long as it has antioxidant ability. A preferred antioxidant used in the present invention is a hindered phenol compound.

  A thiopropionate compound, a phosphite compound, etc. are mentioned, You may use individually by 1 type, or may mix and use 2 or more types. Moreover, it is preferable that the compounding quantity of antioxidant exists in the range of 0.02 to 3 weight% with respect to aromatic polyester. When the blending amount is less than 0.02% by weight, the thermal decomposition inhibitory effect on the polyoxyalkylene polyether is insufficient, and even if it exceeds 3% by weight, the thermal decomposition inhibitory effect is When saturated, no further improvement is observed, and the mechanical properties, hue, etc. of the resulting fiber are impaired.

  In producing the antistatic polyester fiber of the present invention, a water-insoluble polyoxyalkylene polyether, an organic and / or inorganic ionic compound, and, if necessary, an antioxidant are added to the aromatic polyester of the core. For this purpose, the above components can be blended with the aromatic polyester simultaneously or in any j1m order by any method. That is, an arbitrary stage until the spinning of the polyester fiber is completed, for example, at the end of the 5 polycondensation reaction in the middle of the polycondensation reaction before the start of the polycondensation reaction of the aromatic polyester and still in the molten state, the granular state, Alternatively, in the spinning stage, each of the aromatic polyester and the additive component may be melt-mixed in advance and added in one operation, or may be added in two or more divided portions, and each additive component is separately separated in advance. After blending with the aromatic polyester, these may be mixed before spinning. Furthermore, when an additional component is added before the middle stage of the polycondensation reaction, it may be added after being dissolved or dispersed in a solvent such as glycol.

  In addition, the cross-sectional shape of the outer periphery of the antistatic polyester fiber of the present invention and the shape of the figure formed by the core portion can be arbitrarily selected depending on the purpose of the knitted fabric's electrical properties, tension, waist, texture, and gloss. For example, a triangular shape, a flat shape, a square shape, a triangular shape, a star shape, a hexagonal shape, a boomerang shape and the like can be exemplified in addition to a circular cross section. In addition, the core component and the sheath component do not have to be concentric, may have a shape in which the center of the core is deviated, and the cross-sectional shape of the outer periphery and the shape of the figure formed by the core portion are the same shape. Or different shapes.

  The antistatic polyester fiber of the present invention uses a conventionally known composite spinning device, the above-described aromatic polyester B on the sheath side, water-insoluble polyoxyethylene-based polyether, organic and / or inorganic ionicity on the core. It is important to melt-spin and stretch at a speed of 2000 to 4500 m / min using an aromatic polyester A containing a compound and, if necessary, at least one of the above phosphite-based antioxidants. is there. More preferably, it is 2000-3000 m / min.

Further, it is necessary that the ratio (draft ratio) between the discharge speed and the take-up speed during spinning is 100 to 800. If it is less than 100, the strength decreases, and if it exceeds 800, the occurrence of yarn breakage and fluff frequently occurs and the yield decreases.
A method of heat treatment, a method of melt spinning at the above-mentioned speed, and a method of performing stretching and false twisting simultaneously or subsequently, and arbitrary spinning conditions can be employed.

  The obtained fiber or a woven or knitted fabric produced from this fiber is heat-treated at a temperature of 100 ° C. or more to stabilize the structure and to contain the polyoxyalkylene polyether contained in the fiber, if necessary. It is also preferable to promote proper alignment by migration of various additives. Furthermore, sag heat treatment can be used in combination as required.

  Further, if necessary, the antistatic polyester fiber of the present invention or a woven or knitted fabric produced from the fiber may be subjected to an appropriate post-hydrophilic treatment, and it is preferable to do so. As the post-hydrophilic treatment, for example, a method of treating with an aqueous dispersion of a polyester polyether block copolymer comprising terephthalic acid and / or isophthalic acid or their lower alkyl ester, lower alkylene glycol, and polyalkylene glycol. Alternatively, a method in which a hydrophilic monomer such as acrylic acid or methacrylic acid is graft polymerized and then sodium chloride is used can be preferably employed.

Hereinafter, the present invention will be described more specifically with reference to examples. In addition, each item in an Example was measured with the following method.
(1) Intrinsic viscosity Dissolved in ortho-chlorophenol and measured at 35 ° C using an Ubbelohde viscosity tube.
(2) Spinning breakage The melt spinning was performed for 1 week in a composite spinning facility, and the number of breaks was recorded. The number of spinning breaks per spindle per day was defined as the spun yarn. However, thread breakage due to artificial or mechanical factors was excluded from the number of breaks.
(3) Birefringence index According to a conventional method, the birefringence was obtained from the retardation of the polarization observed on the fiber surface using an optical microscope and a compensator.
(4) Strength and elongation of drawn yarn Measured according to JIS L-1013-75.
(5) Number of fluffs Using a DT-104 type fluff counter device manufactured by Toray Industries, Inc., a polyester stretched yarn sample was continuously measured at a speed of 500 m / min for 20 minutes to measure the number of fluffs, and the sample length was 10,000 m. Expressed in the number of hits.
(6) Texture (soft feeling)
Level 1: Soft and supple feel Level 2: Slightly soft feeling but repellent feel Level 3: Crispy or hard feel
(7) Chargeability test method A method (half-life measurement method)
After the composite drawn yarn of the present invention is knitted, dyed, conditioned, and the test piece is charged in a corona discharge field, the time (seconds) until this charged voltage decays to ½ is determined to be a static Honest. Measure with a meter. The shorter the time (seconds), the better the anti-static performance.
Method B (friction charging voltage measurement method)
While rotating the test piece, the test piece is rubbed with a friction cloth and the generated charged voltage is measured.
Conforms to L1094 electrification test method B (friction band voltage measurement method).
Regarding the antistatic effect, if the frictional voltage is about 2000 V or less (preferably 1500 V or less), the antistatic effect is exhibited.

（ただし、ｊは１８〜２８の整数で平均２１、Ｐは平均値として１００、ｍは平均値として５である）
で表される水不溶性ポリオキシエチレン系ポリエーテルを４部及びドデシルベンゼンスルホン酸ナトリウムを２部、真空下で添加し、さらに２４０分間重縮合反応せしめ、次いで酸化防止剤としてチバカイギー社製イルガノックス１０１０を０．４部真空下で添加し、その後さらに３０分間重縮合反応を行なった。重合反応工程で、制電剤を添加し、得られたポリマーの固有粘度は０．６５７、軟化点２５８℃であった。
（ポリエステルＢの作成）
制電剤を添加しないものをポリエステルＢとし、常法によりチップ化した。
製糸化は以下の通り行った。乾燥ポリマーを紡糸設備にて各々常法で溶融し、ギヤポンプを経て２成分複合紡糸ヘッドに供給した。芯と鞘ポリマーの比率が表１記載の値となるように設定した。同時に供給された芯部と鞘部の溶融ポリマーは、ノズル孔径０．２５ｍｍの円形複合紡糸孔をを７２個穿設した紡糸口金から、通常のクロスフロー型紡糸筒からの冷却風で冷却・固化し、紡糸油剤を付与しつつ一つの糸条として集束し、３０００ｍ／ｍｉｎの速度で引き取り、複屈折率０．０３５の１４０ｄｔｅｘ／７２フィラメントのポリエステル未延伸糸を得た。
公知の延伸方法で１．８倍に延伸した延伸糸を用いて筒編地を製造し、制電性を測定した。溶融紡糸時の工程安定性及び制電性能の結果を表１に示す。
次いで、該織物を液流染色機を用いて沸騰水で２０分間リラックス処理し、引き続きプリセット処理を行った後、さらに、染色、ファイナルセット処理を行い、ポリエステル複合延伸糸からなる布帛とした。
得られた布帛の制電性能は１５秒であり、官能評価を実施したところ、非常に深みのある、且つ高級感を有し、ソフト感を呈した風合のものであった。 [Example 1]
100 parts of dimethyl terephthalate, 60 parts of ethylene glycol, 0.06 part of calcium acetate monohydrate (0.066 mol% with respect to dimethyl terephthalate) and 0.013 part of cobalt acetate tetrahydrate as a color adjuster (terephthalic acid) 0.01 mol% with respect to dimethyl) was charged into a transesterification reactor, and the reaction product was heated from 140 ° C. to 220 ° C. over 4 hours under a nitrogen gas atmosphere. The ester exchange reaction was carried out while distilling out. After completion of the transesterification reaction, 0.058 parts of trimethyl phosphate (0.080 mol% with respect to dimethyl terephthalate) as a stabilizer and 0.024 parts of dimethylpolysiloxane as an antifoaming agent were added to the reaction mixture. Next, after 10 minutes, 0.041 part of antimony trioxide (0.027 mol% with respect to dimethyl terephthalate) was added to the reaction mixture, and the temperature was raised to 240 ° C. while distilling off excess ethylene glycol. Thereafter, the reaction mixture was transferred to a polymerization reactor. Next, after reducing the pressure from 760 mmHg to 1 mmHg over 1 hour and 40 minutes and raising the temperature from 240 ° C. to 280 ° C. to cause the polycondensation reaction,
(Creation of polyester A)
The following formula (1) as a polyoxyalkylene polyether as an antistatic agent

(Where j is an integer of 18 to 28, average 21; P is 100 as an average value; m is 5 as an average value)
4 parts of water-insoluble polyoxyethylene-based polyether and 2 parts of sodium dodecylbenzenesulfonate were added under vacuum, followed by a polycondensation reaction for 240 minutes, and then Irganox 1010 manufactured by Ciba Kaigie Co., Ltd. as an antioxidant. Was added under a vacuum of 0.4 parts, followed by a polycondensation reaction for another 30 minutes. In the polymerization reaction step, an antistatic agent was added, and the obtained polymer had an intrinsic viscosity of 0.657 and a softening point of 258 ° C.
(Creation of polyester B)
Polyester B was added with no antistatic agent added, and chips were formed by a conventional method.
The yarn production was performed as follows. The dried polymer was melted in a usual manner in a spinning facility, and supplied to a two-component composite spinning head via a gear pump. It set so that the ratio of a core and a sheath polymer might become the value of Table 1. The molten polymer in the core and sheath supplied at the same time is cooled and solidified with cooling air from a normal cross-flow type spinning cylinder from a spinneret with 72 circular composite spinning holes with a nozzle hole diameter of 0.25 mm. Then, the yarn was bundled as one yarn while applying the spinning oil, and taken up at a speed of 3000 m / min to obtain a 140 dtex / 72 filament polyester undrawn yarn having a birefringence of 0.035.
A cylindrical knitted fabric was manufactured using a drawn yarn drawn 1.8 times by a known drawing method, and the antistatic property was measured. Table 1 shows the results of process stability and antistatic performance during melt spinning.
Next, the fabric was relaxed with boiling water for 20 minutes using a liquid dyeing machine, followed by a preset treatment, followed by further dyeing and final setting treatment to obtain a fabric composed of a polyester composite drawn yarn.
The antistatic performance of the obtained fabric was 15 seconds, and when sensory evaluation was carried out, the fabric had a very deep, high-class feeling and a soft feel.

[Examples 2-3, Comparative Examples 1-5]
The procedure was the same as in Example 1 except that the procedure was performed under the conditions shown in Table 1.
In particular, the present invention is noticeable after high-pressure dyeing in the post-process and is practical and strong in heat resistance. In addition, as a use, school clothes, uniforms, and light resistance are also characterized by a strong constitution. In addition, since the portion that exhibits antistatic properties is encased, it is possible to maintain antistatic properties by enveloping the antistatic component and reducing deformation, so that the antistatic properties are maintained, and fluffing during stretching This is considered to be a factor that is excellent in down, productivity increase, and washing durability in the case of a woven fabric.

  It is useful in applications such as sports clothing, school uniforms, uniforms, and dust-proof clothing that suppress static electricity, or in blouses, shirts, and innerwear that often come into direct contact with the skin.

Claims (2)

It is a core-sheath type composite fiber, the core part is formed of antistatic polyester A, and the sheath part is formed of polyester B containing 0-10 wt% matting agent, and the following (1) to (5) Antistatic core-sheath polyester extra fine drawn yarn that satisfies the conditions.
(1) The single yarn fineness of the drawn yarn is 1.5 dtex or less.
(2) The ratio A: B between the area A of the core and the area B of the sheath is in the range of 5:95 to 80:20.
(3) The strength of the drawn yarn is 3.0 cN / dtex or more.
(4) The friction band voltage of the drawn yarn is 2000 V or less.
(5) Antistatic polyester A as an antistatic agent with respect to 100 parts by weight of aromatic polyester,
(A) 0.2 to 30 parts by weight of a polyoxyalkylene polyether represented by the following formula and (b) 0.05 to 10 parts by weight of an organic ionic compound substantially nonreactive with the polyester It must be an antistatic polyester.
^{_{Z - [(CH 2 CH 2}} O) n (R 1 O) m-R 2] k
[Wherein, Z is an organic compound residue having 1 to 6 active hydrogen atoms, R ¹ is an alkylene group or substituted alkylene group having 6 or more carbon atoms, R ² is a hydrogen atom, having 1 to 40 carbon atoms. A monovalent hydrocarbon group, a monovalent hydroxy hydrocarbon having 2 to 40 carbon atoms or a monovalent acyl group having 2 to 40 carbon atoms, k is an integer of 1 to 6, and n is n ≧ 70 / k. Satisfied integer, m is an integer of 1 or more] The core part is formed of antistatic polyester A, while the sheath part is formed of polyester B containing 0 to 10 wt% matting agent, and satisfies the following conditions (1) to (5) Type polyester extra fine drawn yarn, the spinning speed is 2000 to 4500 m / min, and the ratio of the ejection speed and the take-off speed during spinning (hereinafter referred to as draft ratio) is taken in the range of 100 to 800 A process for producing an antistatic core-sheath polyester extra fine stretched yarn characterized by the above.
(1) The single yarn fineness of the drawn yarn is 1.5 dtex or less.
(2) The ratio A: B between the area A of the core and the area B of the sheath is in the range of 5:95 to 80:20.
(3) The strength of the drawn yarn is 3.0 cN / dtex or more.
(4) The friction band voltage of the drawn yarn is 2000 V or less.
(5) Antistatic polyester A as an antistatic agent with respect to 100 parts by weight of aromatic polyester,
(A) 0.2 to 30 parts by weight of a polyoxyalkylene polyether represented by the following formula and (b) 0.05 to 10 parts by weight of an organic ionic compound substantially nonreactive with the polyester It must be an antistatic polyester.
^{_{Z - [(CH 2 CH 2}} O) n (R 1 O) m-R 2] k
[Wherein, Z is an organic compound residue having 1 to 6 active hydrogen atoms, R ¹ is an alkylene group or substituted alkylene group having 6 or more carbon atoms, R ² is a hydrogen atom, having 1 to 40 carbon atoms. A monovalent hydrocarbon group, a monovalent hydroxy hydrocarbon having 2 to 40 carbon atoms or a monovalent acyl group having 2 to 40 carbon atoms, k is an integer of 1 to 6, and n is n ≧ 70 / k. Satisfied integer, m is an integer of 1 or more]