JP2009019288A - Antistatic hollow polyester fiber and method for producing the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an antistatic hollow polyester fiber having heat insulating properties by a hollow structure, excellent antistatic properties, antistatic durability and dyeing grade, good properties of passing through steps in high-order processing and excellent operation stability and quality stability. <P>SOLUTION: The antistatic hollow polyester fiber properly propagating electric charges and remarkably improving the antistatic properties which are balanced with quality of no whitening by using a specific polyether-ester-amide and by regulating the shape of polyether-ester-amide particles in the fiber. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention provides a knitted knitted fabric that achieves both excellent antistaticity and quality by controlling the dispersion state of the polyether ester amide antistatic component having excellent compatibility with light weight and heat retention due to a single yarn hollow structure. The present invention relates to an antistatic hollow polyester fiber to be provided and a method for producing the same.

  Polyester is not limited to manufacturing advantages such as excellent productivity and low product price, but also fabric processing, dyeability, comfort of sewing products, handling of clothing products, ease of washing and quick drying, etc. However, it has many advantages over other synthetic fibers and is the most widely used among synthetic fibers. In addition, polyester has been widely studied as a technique for imparting a new function by, for example, making the cross section atypical because of its excellent moldability.

  Among functional additions by cross-sectional shape, there are many fibers that have been devised for cross-sectional shape of single yarn to improve heat retention, which is an important basic performance of clothing, and typical ones are single yarn or fiber This is a method of holding an air heat insulating layer by hollowing out the structure. These techniques are widely used in winter clothing as techniques that further improve the excellent convenience of polyester.

  However, when compared with natural fibers such as cotton and wool used for winter clothing and semi-synthetic fibers such as rayon and acetate, polyester fibers are more hydrophobic due to the nature of the material and are more likely to generate static electricity. There has been a problem that clothes such as clinging of clothes and adhesion due to static electricity occur. This is a defect that is not suitable for winter clothing apart from the heat retaining property of hollow polyester fiber, and various means have been proposed to improve this, for example, antistatic agent is applied to the yarn surface by post-processing. A method of grafting a hydrophilic substance on the surface of the yarn, a method of kneading an antistatic substance in the fiber component, and the like. However, all of these methods have problems in terms of durability, heat-resistant yarn-making stability, and quality defects in the knitting and knitting process.

  For example, in the method of applying an antistatic agent to the yarn surface, the antistatic agent is likely to disappear by a dyeing process or washing, and also when applied at the end of the fabric process, the durability is insufficient and the texture is stiff. Alternatively, there are various problems such as being unable to use in combination with other post-processing, specifically water-repellent processing. In addition, the method of graft polymerizing a hydrophilic substance on the yarn surface significantly improves the disappearance of the antistatic agent by washing, but has a problem in durability and texture. Furthermore, although the method of kneading the antistatic material improves the durability, the textile process and the whitening phenomenon during wearing are problematic. This whitening phenomenon is a phenomenon in which the part that has been mechanically damaged in the textile process becomes a defect in fabric quality, or the part that receives friction when worn is whitened, and the cause is a kneaded antistatic substance Interfacial delamination occurs at the interface between polyester and polyester, and hollow cracks are likely to occur simultaneously with fibrillation in the hollow cross section, and degradation of fabric quality was a serious problem.

  And many methods using a composite spinning technique are proposed as a method of improving the fault accompanying these antistaticity provision. For example, a composite spun fiber has been proposed in which a polyester containing a polyalkylene ether and an anionic surfactant is used as a core component and the polyester is used as a sheath component (see Patent Document 1). However, with this technology extension, it is difficult to obtain a fiber having a hollow cross-sectional shape.

  In addition, as a polyester antistatic fiber blended with a polymer type antistatic component having high molecular weight and heat resistance, a technology of polyester antistatic fiber containing a block polyether ester amide composition and a sulfonic acid metal salt compound has been proposed. (Patent Documents 2 and 3). Although antistatic performance can be obtained even with this method, however, in order to obtain high antistatic performance, it is necessary to use a large amount of antistatic agent, and hollow cracks and spinning tension are deteriorated. There was a problem such as whitening due to interfacial peeling.

JP 2006-2258 A JP-A-63-28211 Japanese Patent No. 2990689

  The present invention solves the above-mentioned problems, has excellent heat retention, antistatic properties, antistatic durability, and dyeing quality, and has good process passability in high-order processing, operational stability and stable quality. An antistatic hollow polyester fiber having excellent properties and a method for producing the same are provided.

A polyester fiber having a hollow ratio of 5 to 50%, comprising polyetheresteramide and an organic electrolyte as an antistatic agent, and an antistatic hollow polyester fiber satisfying the following requirements.
(1) Containing 3 to 10% by weight of polyetheresteramide with respect to the total weight of the polyester fiber.
(2) Polyetheresteramide is an ethylene oxide adduct (b) of a polyamide (a) having a carboxyl group at both ends and having a number average molecular weight of 500 to 5,000 and a bisphenol having a number average molecular weight of 1,600 to 3,000. The relative viscosity is 1.5 to 3.5 (0.5 wt% m-cresol solution, 25 ° C.) and the compatibility parameter is ± 0.5 (with respect to the compatibility parameter of the polyester serving as the substrate). J / cm ³ ) ^ 1/2.
(3) The average particle diameter D of the polyetheresteramide in the cross section orthogonal to the fiber axis direction of the antistatic polyester fiber is 10 to 100 nm.
(4) Ratio of the average length L in the fiber axis direction of the polyetheresteramide particles in the cross section parallel to the fiber axis direction of the antistatic polyester fiber to the above D, L / D (also sometimes referred to as an aspect ratio) ) Is 50 or more.
(5) The frictional voltage of the antistatic polyester fiber is 1500 V or less.

  As in the present invention, by using a specific polyether ester amide, the dispersion state in the polyester fiber is controlled, and it has excellent texture, quality, durability antistatic property, and antistatic property with excellent process passability. Hollow polyester fibers can be provided.

  The antistatic agent blended with the antistatic polyester hollow fiber of the present invention is a polyether ester amide antistatic agent containing a predetermined amount of an organic electrolyte in a polyether ester amide derived from an ethylene oxide adduct of a high molecular weight bisphenol. It is an agent.

  Examples of the organic electrolyte include sulfonic acids such as dodecylbenzenesulfonic acid, dodecylbenzenesulfonic acid, nonylbenzenesulfonic acid, hexadecylsulfonic acid and dodecylsulfonic acid, and alkali metals such as sodium, potassium and lithium. Examples thereof include alkali metal salts of sulfonic acid, alkali metal salts of phosphoric acid such as distearyl phosphate, and among them, metal salts of sulfonic acid such as sodium alkyl sulfonate are preferable. The content is 0.05 to 0.8 wt% with respect to the total weight of the polyether ester amide. If it is 0.05 or less, the antistatic property is insufficient, and if it is 0.8 or more, it is not uniformly dispersed. This is not preferable because it forms an association state and causes dispersibility failure and hollow cracking and whitening phenomenon.

  The polyether ester amide used in the antistatic agent of the present invention is an ethylene oxide adduct (a2) of a polyamide (a1) having a carboxyl group at both ends and having a number average molecular weight of 500 to 5000 and a bisphenol having a number average molecular weight of 1600 to 3000. )

  (A1) is (1) a lactam ring-opening polymer, (2) a polycondensate of an aminocarboxylic acid or (3) a polycondensate of a dicarboxylic acid and a diamine, and the lactam of (1) includes caprolactam, enanthate Examples include lactam, laurolactam, undecanolactam and the like. Examples of the aminocarboxylic acid (2) include ω-aminocaproic acid, ω-aminoenanthic acid, ω-aminopergonic acid, ω-aminocapric acid, 11-aminoundecanoic acid, and 12-aminododecanoic acid. Examples of the dicarboxylic acid (3) include adipic acid, azelaic acid, sebacic acid, undecanoic acid, dodecanedioic acid, isophthalic acid, and the diamines include hexamethylenediamine, heptamethylenediamine, octamethylenediamine, and decamethylene. Examples include diamines. Those exemplified as the amide-forming monomer may be used in combination of two or more. Among these, caprolactam, 12-aminododecanoic acid and adipic acid-hexamethylenediamine polycondensate are preferable, and caprolactam is particularly preferable.

  (A1) can be obtained by using a dicarboxylic acid component having 4 to 20 carbon atoms as a molecular weight adjusting agent, and subjecting the amide-forming monomer to ring-opening polymerization or polycondensation in the presence of the dicarboxylic acid component by a conventional method. Examples of the dicarboxylic acid having 4 to 20 carbon atoms include fatty acid dicarboxylic acids such as succinic acid, glutaric acid, adipic acid, pimelic acid, suberic acid, azelaic acid, sebacic acid, undecadiic acid, dodecanediic acid; terephthalic acid, isophthalic acid, phthalate Aromatic dicarboxylic acids such as acids and naphthalenedicarboxylic acids; aliphatic dicarboxylic acids such as 1,4-cyclohexanedicarboxylic acid and dicyclohexyl-4,4-dicarboxylic acid; sodium 3-sulfoisophthalate, potassium 3-sulfoisophthalate, etc. Examples include alkali metal salts of 3-sulfoisophthalic acid. Of these, preferred are aliphatic dicarboxylic acids, aromatic dicarboxylic acids and alkali metal salts of 3-sulfoisophthalic acid. The number average molecular weight of the above (a1) is usually 500 to 5000, preferably 500 to 3000. When the number average molecular weight is less than 500, the heat resistance of the polyether ester amide itself is lowered, and when it exceeds 5000, the reactivity is lowered.

  The bisphenols of the ethylene oxide adduct (a2) of bisphenols include bisphenol A (4,4′-dihydroxydiphenyl-2,2-propane), bisphenol F (4,4′-dihydroxydiphenylmethane), bisphenol S (4,4). 4'-dihydroxydiphenylsulfone), 4,4'-dihydroxydiphenyl-2,2 butane, etc., among which bisphenol A is preferred. (A2) can be obtained by adding ethylene oxide to these bisphenols by a conventional method. In addition, other alkylene oxides (propylene oxide, 1,2-butylene oxide, 1,4-butylene oxide, etc.) can be used in combination with ethylene oxide, but the amount of other alkylene oxide is usually 10 based on the amount of ethylene oxide. % By weight or less.

When bisphenols are not used, the relative viscosity of the polyether ester amide is lowered, and the particle diameter (D) in the fiber is decreased, which is not preferable. The amount of bisphenol used is desirably 1 to several mol% in the polyether component.
The number average molecular weight of the above (a2) is usually 1600 to 3000, and it is particularly preferable to use those having an ethylene oxide addition mole number of 32 to 60. When the number average molecular weight is less than 1600, the antistatic property is insufficient, and when it exceeds 3000, the reactivity is lowered, so that a great amount of time is required for producing the polyether ester amide.

(A2) is used in the range of 20 to 80% by weight with respect to the total weight of (a1) and (a2). When the amount of (a2) is less than 20% by weight, the antistatic property of the polyetheresteramide (A) is inferior, and when it exceeds 80% by weight, the heat resistance is lowered, which is not preferable.
The composition of the polyether ester amide (A) of the present invention is a very important requirement for compatibility with the polyester as a substrate. In general, as the compatibility parameter (also referred to as the solubility parameter) is closer, the affinity increases and the interfacial peeling is less likely to occur.

Accordingly, the compatibility parameter of the polyetheresteramide (A) of the present invention is such that the antistatic polymer composition is within the range of ± 0.5 (J / cm ³ ) ^ 1/2 with respect to the compatibility parameter value of the polyester. It is necessary to. For example, in the case of polyethylene terephthalate, since the compatibility parameter is 20.9 (J / cm ³ ) ^ 1/2, the compatibility parameter of polyetheresteramide is in the range of 20.4 to 21.4. It is necessary. Beyond this range, the interfacial adhesion between the polyester and the antistatic polymer is insufficient, and a whitening phenomenon due to interfacial delamination occurs due to friction during post-processing and wearing. Preferably, it is within ± 0.3 (J / cm ³ ) ^ 1/2 with respect to the base polyester.

The compatibility parameter of the polyether ester amide (A) can be adjusted by adjusting the composition ratio of the polyamide component amount and the polyether component amount.
As a manufacturing method of polyetheresteramide, the following manufacturing method 1 or manufacturing method 2 is illustrated, However It does not specifically limit.
Production Method 1: A method in which an amide-forming monomer and a dicarboxylic acid are reacted to form (a1), (a2) is added thereto, and a polymerization reaction is performed at high temperature and under reduced pressure.
Production method 2: An amide-forming monomer and dicarboxylic acid and (a2) are simultaneously charged into a reaction vessel, and (a1) is produced as an intermediate by pressure reaction at high temperature in the presence or absence of water. A method of performing a polymerization reaction of (a1) and (a2) under reduced pressure.

  Moreover, a well-known esterification catalyst is normally used for said polymerization reaction. Examples of the catalyst include antimony catalysts such as antimony trioxide, tin catalysts such as monobutyltin oxide, titanium catalysts such as tetrabutyl titanate, zirconium catalysts such as tetrabutyl zirconate, and metal acetates such as zinc acetate. And system catalysts. The usage-amount of a catalyst is 0.1 to 5 weight% normally with respect to the total weight of (a1) and (a2).

  The relative viscosity of the polyether ester amide obtained as described above is 1.5 to 3.5 (0.5 wt% m-cresol solution, 25 ° C.), preferably 1.5 to 3.0. If it is less than 1.5, the dispersed particle size of the antistatic agent becomes small and the antistatic property is insufficient. Moreover, in the range exceeding 3.5, it becomes the cause of thread breakage in the yarn making stage.

  The amount of the polyether ester amide added to the polyester needs to include 3 to 10% by weight. Preferably, it is the range of 6-9 weight%. If it is less than 3% by weight, the antistatic property is insufficient, and if it exceeds 10% by weight, the quality of the yarn is deteriorated, the strength is lowered, and the heat setting property is lowered, thereby deteriorating the quality.

  Examples of the polyester used for the hollow fiber in the present invention include polyalkylene terephthalate and polyalkylene phthalate. Among them, the former terephthalic acid is the main acid component, and the alkylene glycol component having 2 to 6 carbon atoms, that is, ethylene glycol, triethylene. Polyesters having at least one glycol selected from methylene glycol, tetramethylene glycol, pentamethylene glycol and hexamethylene glycol as the main glycol component are targeted. Such a polyester may be produced by an arbitrary method. For example, polyethylene terephthalate can be described by directly esterifying terephthalic acid and ethylene glycol, or lower alkyl ester of terephthalic acid such as dimethyl terephthalate and ethylene glycol. To form a glycol ester of terephthalic acid and / or its low degree of polymerization, such as by reacting terephthalic acid with ethylene oxide, and then heating the product under reduced pressure to produce the desired The polycondensation reaction is carried out until the degree of polymerization becomes.

  In this polyester, a part of the terephthalic acid component may be replaced with another bifunctional carboxylic acid component. Examples of such carboxylic acids include isophthalic acid, phthalic acid, dibromoterephthalic acid, naphthalene dicarboxylic acid, diphenyl carboxylic acid, diphenethane carboxylic acid, bifunctional aromatic carboxylic acid such as β-oxyethoxybenzoic acid, and sebacin. Bifunctional aliphatic dicarboxylic acid such as acid, adipic acid and oxalic acid, 1,4-cyclohexanedicarboxylic acid and the like can be mentioned. Further, part of the glycol component may be replaced with another glycol component. Examples of the glycol component include cyclohexane-1,4-dimethanol, neopentyl glycol, bisphenol A, bisphenol S, 2,2-bis (3 , 5-dibromo-4- (2-hydroxyethoxy) phenyl) propane, and aliphatic, alicyclic and aromatic diols. Further, the above-mentioned polyester may be obtained by blending and melting a small amount of other polymers as required, or by using a small amount of a chain branching agent such as pentaerythritol, trimethylolpropane, trimellitic acid or the like. In addition, the polyester of the present invention may be added with pigments such as titanium oxide and carbon black, as well as conventionally known antioxidants and anti-coloring agents in the same manner as ordinary polyesters.

The dispersion state of the polyether ester amide of the present invention in the polyester fiber is an important invention requirement and must satisfy the following requirements.
(1) It is necessary that the average particle diameter D of the polyether ester amide in the cross section orthogonal to the fiber axis is in the range of 10 to 100 nm. Preferably, it is the range of 20-80 nm. If it is less than 10, the frictional voltage exceeds 2500 and the antistatic property is insufficient. On the other hand, if it is more than 100 nm, the thickness of each filament is likely to occur, and spinning / drawing breakage etc. Will occur frequently and productivity will deteriorate.
(2) L (average length of particles in the fiber axis direction) / D (cross section perpendicular to the fiber axis) when the average length L in the fiber axis direction of the polyetheresteramide particles in a cross section parallel to the fiber axis The average particle diameter at 50) is required to be 50 or more. In order to impart antistatic properties, it is important to provide a field where the antistatic agent is in a long continuous state in the fiber and the charge easily moves. Therefore, the longer the length of the agent in the fiber axis direction, the better. Preferably, it is 100-600, More preferably, it is 200-400. L / D can be easily adjusted by the relative viscosity of the polyether ester amide, the shear rate during melt spinning, and the spinning draft rate.
(3) As the antistatic performance, the frictional voltage needs to be 1500 V or less. Preferably, it is 1000 V or less. When the voltage exceeds 1500 V, clothing clinging or generation of static electricity may occur, and when the voltage is 2500 V or higher, almost no effect due to the antistatic performance can be confirmed.

  The antistatic hollow polyester fiber of the present invention may be a mixed fiber or false twisted yarn in addition to a flat yarn, but preferably has a crimp rate of 10% or more showing stretch performance. When it is less than 10%, the swelling and stretchability of the fabric is insufficient. With the recent trend toward casual clothing, there are many knitted products, and sports clothing, thin knitted products, and products with anti-static properties are in high demand for comfort.

  Similarly, the single yarn fineness and the number of filaments are also important requirements for enhancing the commercial value in terms of function and texture. A single yarn of 0.3 dtex or less lacks stability in the yarn production process, whereas a yarn of 5 dtex or more is not preferable because the texture is hard. In order to meet the need for lightening (thinning), it is important to reduce the number of filaments to 12 or less, but if it is less than 12, it is difficult to withstand the spinning tension due to insufficient absolute strength, which is not preferable for production.

  The hollow fiber of the present invention is usually produced by a known method as follows. The above-mentioned antistatic agent-containing polyester molten resin is provided in the discharge nozzle, and is formed into a circular shape composed of four divided arcs as shown in FIG. 1 (a) or a partially divided shape as shown in FIG. 1 (b). Alternatively, a hollow fiber having a circular cross section or an irregular shape is generally made by extruding from a circular discharge hole formed of a continuous circle shown in FIG. Therefore, when the molten resin is discharged from the divided discharge ports as shown in FIGS. 1A and 1B, a divided hole is formed in the hollow fiber in the vicinity of the discharge port, and the resins are mutually downstream. Connect to become a complete hollow fiber. The cooled and solidified yarn is preferably collected after being focused at a position 40 to 100 cm below the spinneret surface.

As requirements for determining the dispersion state of the antistatic agent of the antistatic hollow polyester fiber of the present invention, shearing in the die in the spinning step in the production method and spinning draft after discharging the die are important. This is a requirement necessary to achieve antistatic properties and quality by setting the particle size and length of the antistatic agent within a certain range. That is, it is necessary to set the cap hole diameter and the discharge amount so that the shear rate (formula 1) in the discharge hole is in the range of 400 to 9000.
Shear rate: Vs (sec ⁻¹ ) = 4Q (cm ³ / sec) / πr (cm) ^ 3 Formula 1
Q: Polymer discharge amount per discharge hole (cm ³ / sec)
r: radius of the discharge hole (cm ³ )

  If the hole diameter is too large relative to the discharge amount, the dispersion (particle size reduction) action of the antistatic agent in the discharge hole is small, so that the dispersion of the particle diameter is large, which is likely to cause yarn breakage. On the other hand, if the discharge hole diameter is too small and the dispersion action is too large, the particle diameter becomes small and the antistatic effect is not achieved. Therefore, a range of 400 to 9000 is necessary, and a range of 600 to 8000 is preferable.

  Further, it is necessary that the spinning draft rate = V2 / V1, which is the ratio of the extrusion speed V1 from the discharge hole and the take-up roller speed V2, is in the range of 200 to 2000. This has a round to oval shape with a range of particle sizes in the discharged blend polymer stream, in which the entire polymer stream is gradually stretched and accelerated while being cooled, resulting in a glass transition temperature. At this point, the take-up speed V2 has been reached. The acceleration dV / dx during that time increases as the spinning draft increases, and the polymer stream undergoes large deformation. Therefore, in order to stretch the antistatic agent, the draft needs to be in a large range, that is, 200 to 2000. Here, when it is less than 200, the agent is not sufficiently elongated, and the L / D is less than 50, resulting in insufficient antistatic properties. On the other hand, if it exceeds 2000, the large deformation action is excessive and there is a problem of spun yarn, which is insufficient.

Hereinafter, the present invention will be described in detail using specific examples.
Each measurement method is implemented as follows.
(1) Average particle diameter of polyether ester amide antistatic agent In order to measure the polyester fiber of the present invention with a transmission electron microscope, a cross section perpendicular to the fiber axis having a thickness of 100 nm is prepared and observed. At this time, the diameter of the particles in the fiber cross section is measured at n = 100, and the average value is calculated.
(2) L / D of polyetheresteramide antistatic agent (sometimes referred to as aspect ratio)
In order to measure the polyester fiber of the present invention with a transmission electron microscope, a section parallel to the fiber axis direction having a thickness of 100 nm is prepared and observed. At this time, the length of the antistatic agent particles in the section parallel to the fiber axis direction is measured at n = 50, and the average value is calculated. The ratio of the average L value and the average D value of (1) is calculated to obtain the L / D value.
(3) Measurement of frictional voltage The sample fiber is measured according to the JIS L 1094 frictional voltage measurement method, and the voltage (V) 60 seconds after the start of friction is measured. The measurement was carried out in a test room at a temperature of 20 ± 1 ° C. and a relative humidity of 40 ± 2%. Warp Thread Direction Weft Yarn Method Measured at each n = 5, and a cotton-attached white cloth specified in JIS L 0803 was used as the friction cloth.
(4) Hollow ratio measurement It is a void ratio which occupies the outer diameter cross-sectional area in the fiber single yarn cross section, calculated by hollow ratio = inner diameter cross-sectional area / outer diameter cross-sectional area × 100, and average value of n = 50 sampled from the cross-sectional direction photograph. .
(5) Whitening test Prepare a test cloth after the dyeing process. Using an electric iron preheated to 150 ± 5 ° C., the test cloth is slid 6 times (3 reciprocations) at a speed of 2 cm per second. The temperature is the surface temperature at the center of the bottom surface of the electric iron. Next, 15% weight reduction is performed using a hot alkaline aqueous solution. Color measurement n = 2 of the L value (degree of whitening) of the test cloth (L1) to which the load is applied from the outside and the test cloth (L0) to which the load is not applied from the outside is performed by the following formula. The obtained color difference value is defined as whitening. Whitening property = L1-L0
A whitening property of 1.0 or less is acceptable.

[Examples 1 to 4]
Polyethylene terephthalate chips (IV = 0.64) obtained by drying the polyether ester amide described in Table 1 (containing 0.8% Na alkyl sulfonate as an ionic substance) at 80 ° C. and dried at 160 ° C. And melted at a melting temperature of 295 ° C., and then passed through a pack in which a 400M filter is placed on the top of the die, as shown in Table 1, changing the die hole diameter / number of holes and addition amount, and discharging the polymer. Rolled up. Using the raw yarn, stretched heat was set at a draw ratio of 2.4 times using a roller having a preheating temperature of 90 ° C. and a slit heater having a set temperature of 170 ° C. to produce a drawn yarn. The fiber was put into a circular knitting state with a 20G cylinder knitting machine, refined at 80 ° C., washed with water and dried, and then dyed with high pressure at 120 ° C. using 4% of the dye in terms of fabric weight. The friction withstand voltage was measured using the dyed sample.

  In Examples 1, 2, 3, and 4, the amount of polyetheresteramide (hereinafter referred to as PEEA) is appropriate and the compatibility parameter is within the range, and the yarn forming conditions such as the shear rate in the die and the draft are within the scope of the present invention. Therefore, an antistatic polyester hollow fiber excellent in performance and quality was obtained, satisfying the particle size of the antistatic agent and the length in the fiber axis direction, without frictional voltage and whitening phenomenon.

[Comparative Examples 1-8]
In Comparative Examples 1-8, it carried out as shown in the table. In Comparative Example 1, since the discharge amount was small and the shear rate in the die was too small, PEEA was not sufficiently dispersed, and single-fiber hollow cracks were likely to occur, and a whitening phenomenon was observed in the processing step. In Comparative Example 2, since the amount of PEEA added is small, the antistatic property is insufficient. On the other hand, in Comparative Example 3, since the amount of PEEA added is too large, yarn breakage frequently occurs in spinning, and the present invention. It does not satisfy. In Comparative Example 4, a hollow polyester fiber to which PEEA was not added was described for reference. In Comparative Example 5, PEEA had a high relative viscosity, and a whitening phenomenon was observed instead of an appropriate particle shape. Since the comparative example 6 uses PEEA which does not use bisphenol A, the viscosity decreases and the reason is not clear, but the frictional voltage increases. Comparative Examples 7 and 8 are antistatic agents with low compatibility parameters and high antistatic agents, and neither whitening nor frictional voltage is satisfied.

  Since the antistatic hollow polyester of the present invention has antistatic properties and antistatic durability as well as excellent texture, it is useful for clothing applications.

An example of a spinneret for hollow fibers.

Claims (4)

An antistatic hollow polyester fiber having a hollow ratio of 5 to 50%, comprising polyetheresteramide and an organic electrolyte as an antistatic agent, and satisfying the following requirements.
(1) Containing 3 to 10% by weight of polyetheresteramide with respect to the total weight of the polyester fiber.
(2) Polyetheresteramide is an ethylene oxide adduct (b) of a polyamide (a) having a carboxyl group at both ends and having a number average molecular weight of 500 to 5,000 and a bisphenol having a number average molecular weight of 1,600 to 3,000. The relative viscosity is 1.5 to 3.5 (0.5 wt% m-cresol solution, 25 ° C.) and the compatibility parameter is ± 0.5 (with respect to the compatibility parameter of the polyester serving as the substrate). J / cm ³ ) ^ 1/2.
(3) The average particle diameter D of the polyetheresteramide in the cross section orthogonal to the fiber axis direction of the antistatic hollow polyester fiber is 10 to 40 nm.
(4) The ratio of the average length L in the fiber axis direction of the polyetheresteramide particles in the cross section parallel to the fiber axis direction of the antistatic hollow polyester fiber to the above D, L / D (may be abbreviated as aspect ratio in some cases). Is) 100 or more.
(5) The frictional voltage of the antistatic hollow polyester fiber is 1500 V or less.   The antistatic hollow polyester fiber according to claim 1, wherein the crimp rate is 10% or more. It is derived from a polyamide (a) having a number average molecular weight of 500 to 5,000 having carboxyl groups at both ends and an ethylene oxide adduct (b) of a bisphenol having a number average molecular weight of 1,600 to 3,000, and has a relative viscosity of 1. 5 to 3.5 (0.5% by weight m-cresol solution, 25 ° C.), the difference from the compatibility parameter of the polyester serving as the base is in the range of ± 0.5 (J / cm ³ ) ^ 1/2 The polyester resin containing the polyether ester amide as an antistatic agent has a cutting speed (shear strain speed) in the discharge nozzle hole after melting of 200 to 9000, and the speed V1 and the take-up roller speed extruded from the discharge hole. A method for producing antistatic hollow polyester fiber, wherein spinning is performed at a spinning draft ratio = V2 / V1 of V2 of 200 to 30000.   A textile product comprising the antistatic hollow polyester fiber according to claim 1.

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