JPH0116926B2 - - Google Patents

Description

[Detailed description of the invention]

[Technical Field] The present invention relates to a method for producing polyamide fibers with excellent antistatic properties.More specifically, the present invention relates to a method for producing polyamide fibers with excellent antistatic properties. The present invention relates to a method for producing polyamide fibers. [Prior art and its problems] Polyamide containing polyalkylene ether compounds, especially polyethylene oxide compounds, has antistatic properties and suppresses the generation of static electricity, so it is usefully used in many clothing fields. It has been done. In order to use these in fibers, a polyamide composition containing a polyalkylene ether compound is mixed with polyamide, then melt-spun and stretched, so that the polyamide composition is dispersed in streaks in the fiber axis direction. , antistatic performance is demonstrated. However, as high-speed spinning technology progresses, simply increasing the speed of the above-mentioned method that has been applied so far will result in a significant drop in anti-static performance and at the same time deterioration in spinning properties. At the same time, the quality of the yarn also deteriorates, causing problems in the yarn properties and manufacturing. [Objective of the Invention] The object of the present invention is to provide a method for stably producing antistatic polyamide fibers that do not have the above-mentioned drawbacks, that is, have excellent antistatic performance and general yarn quality under high spinning speed conditions. It is about providing. [Structure of the Invention] The object of the present invention described above is to produce a polyamide composition (A) copolymerized with a polyalkylene ether compound and a composite fiber having polyamide as a core component and polyamide as a sheath component at a speed of 1500 m/min or more, 9000 m/min At the following spinning speed, and the concentration of the polyalkylene ether component in the composition (A) relative to the core component is 2.0% by weight.
This can be achieved by a method for producing an antistatic polyamide fiber characterized in that the content is 40% by weight or less and the melting residence time of the core component is 5 minutes or more and 60 minutes or less. The polyamide composition copolymerized with a polyalkylene ether compound used in the present invention (hereinafter abbreviated as AE composition) is a combination of polyether and polyamide such as block polyether amide, block polyether ester amide, and random polyether amide. It refers to a copolymer and does not include a simple blend of polyether and polyamide.
Particularly, block polyetheramide is preferably used in the method of the present invention because it is easy to manufacture and the polyamide fiber obtained by blending the composition has good physical properties. The polyalkylene ether (hereinafter abbreviated as PAE) constituting the block polyether amide is a polymeric product of ethylene oxide and/or propylene oxide such as polyethylene ether, polypropylene ether, and polyethylene propylene ether. The molecular weight of these polyethers is preferably 1,000 or more, preferably 3,000 to 8,000, and among them, polyethylene glycol is most suitable. On the other hand, the polyamides that make up block polyetheramide are nylon 6, nylon 8, nylon
It is a homopolyamide such as 12, nylon 66, and nylon 610, or a copolymer containing these or other copolymer components, and is a homo or copolyamide produced by a polycondensation reaction of polyamide-forming components. As a method for producing block polyether amide, for example, both ends of polyalkylene glycol are cyanoethylated, hydrogenated to form polyalkylene ether diamine, and this is reacted with a suitable dicarboxylic acid such as adipic acid or sebacic acid. A method in which a nylon salt is synthesized using a method of polycondensation of this salt and the monomer forming the polyamide, and a method in which both terminals of a polyalkylene glycol are aminated to form a polyalkylene ether diamine, and then polycondensation is performed in the same manner as described above. Examples include condensation methods, but the method for producing these block polyetheramides is not particularly limited. The weight ratio of the polyether component to the polyamide component in the block polyether amide is suitably 30-70:70-30. The polycondensation method for block polyether amide is not particularly limited, and may be a conventional polyamide polycondensation method, such as an ordinary pressure polymerization method often used for nylon 6, or a pressure polymerization method used for nylon 66. Legal methods can be used regardless of whether it is a batch method or a continuous method. Further, the AE composition may contain an organic electrolyte in order to exhibit antistatic performance more effectively. The organic electrolytes mentioned here include dodecylbenzenesulfonic acid, tridecylbenzenesulfonic acid, nonylbenzenesulfonic acid, hexadecylsulfonic acid,
Alkali metal salts of sulfonic acids formed from sulfonic acids such as dodecyl sulfonic acid and alkali metals such as sodium, potassium, and lithium; alkali metal salts of phosphoric acids such as sodium distearyl phosphate; and alkali metal salts of other organic carboxylic acids. Among them, metal salts of sulfonic acids such as sodium dodecylbenzenesulfonate are good. The proportion of organometallic salt in the AE composition is preferably 1 to 10% by weight. A range of 3 to 7% by weight is particularly preferred. If it is less than 1% by weight, the antistatic property improving effect will be insufficient, and if it is more than 10% by weight, the antistatic property will deteriorate due to the deterioration of the streak-forming ability due to a decrease in the melt viscosity of the AE composition. Additionally, an antioxidant may be added to improve the thermal stability of the AE composition during melting. The antioxidant may be added during the polycondensation step of producing the AE composition, or may be added during mixing with the polyamide granules (chips) prior to melt spinning. The antioxidant is not particularly limited, but phenolic antioxidants are particularly preferred. Examples of phenolic antioxidants include 1,
3,5 trimethyl-2,4,6-tri(3,5 di-Tert-butyl4-hydroxybenzyl)benzene, 2,2'-methylenebis(4-methyl-6-
Tert-butylphenol), 2,6-di-Tert-
It is a phenolic derivative having a sterically hindered substituent adjacent to a phenolic hydroxyl group such as butylphenol. The polyamide used in the present invention is commonly used as a polyamide fiber, similar to the constituent units of the block polyetheramide described above.
Examples include nylon 6, nylon 8, nylon 12, nylon 66, nylon 610, homopolyamides such as polyamides containing terephthalic acid or isophthalic acid as structural units, and copolymers of these or with other copolymer components. It will be done. In the present invention, the AE composition as an antistatic agent is mixed with polyamide. For this mixing, a method of mixing fine particles of the AE composition with fine polyamide particles is suitable, and it is particularly suitable to use a rotary mixer. These mixed fine particles are melted prior to spinning, and a typical pressure melter type melting device is suitable for this purpose. In an extruder-type melting device, the AE composition is not well formed into streaks in the fiber after fiber formation;
The antistatic performance is inferior to that when a pressure melter type is used. In the present invention, a high-speed spinning method is used, and in this case, a core-sheath type composite spinning method is employed. However, the antistatic properties of fibers produced by simply spinning a polymer in which the AE composition is uniformly mixed with polyamide at high speed are inferior.
FIG. 1 of the Examples described below shows the relationship between the spinning speed and the specific resistance of the fiber in a uniform mixture of block polyether amide. As can be seen from FIG. 1, especially when the spinning speed exceeds 1500 m/min, the specific resistance increases rapidly and the antistatic performance deteriorates. In order to avoid this problem caused by increasing the spinning speed, the present invention adopts a core-sheath composite system and adds the AE composition only to the core. The sheath is made of polyamide that is substantially free of the AE composition. The concentration of the AE composition contained in the core in the present invention is such that the concentration of the component copolymerized into the AE composition is 2.0% or more by weight or more than 40% by weight based on the entire polymer of the core.
The content is preferably 3.0% by weight or more and 30% by weight or less. The concentration of PAE component in the ether part is 2% by weight.
If it is less than 40, good antistatic performance cannot be obtained, and if it is less than 40
If it exceeds % by weight, the spinnability will deteriorate when the core component is spun, making it impossible to obtain a stable spinning state. The concentration of PAE component in this core is much higher than the concentration of PAE component contained in antistatic polyamide fibers that have been generally produced.In other words, PAE as an antistatic agent It can be said that the components are localized at a high concentration in this core region. This makes an extremely effective contribution to ensuring antistatic performance, especially under spinning conditions where the spinning speed is high. In addition, the concentration of the AE composition for the entire yarn is PAE
The concentration of the components is preferably 0.25% by weight or more15
It is not more than 0.5% by weight and not more than 10% by weight. Incidentally, the ratio of the core portion to the entire yarn (hereinafter abbreviated as core ratio) is an important factor from the viewpoint of the obtained yarn properties and the relationship with the melt zone residence time of the core portion, which will be described later. In principle, it is sufficient to satisfy the above-mentioned concentration range of the PAE component in the core, but in the present invention, it is preferably 2.5% by weight or more and 60% by weight or less, taking into account the melting residence time range described below. More preferably, it is 5% by weight or more and 50% by weight or less. The above is the PAE concentration in the core and the overall yarn
The preferred ranges of PAE concentration and core ratio have been described, and these ranges are shown in FIG. straight line here
LM is when the core ratio is 100% (uniformly mixed system). Straight lines EF and HI have core ratios of 60% and 60%, respectively.
This is the case when the core ratio is 2.5%, and the straight lines E'F' and H'I' are when the core ratio is 50% and 5%, respectively. A preferable range showing the above-mentioned good spinning stability and yarn specific resistance value is a region surrounded by EFGHIJ, and a more preferable range is a region surrounded by E′F′G′H′I′J′. The melting residence time of the core component containing a high concentration of the AE composition is important from the viewpoint of the antistatic performance and general yarn physical properties of the resulting polyamide fiber, as well as the stability of the spinning state. In the present invention, the melting residence time of the core component must be 5 minutes or more and 60 minutes or less, preferably
It should be at least 7.5 minutes and no more than 45 minutes. If the time is less than 5 minutes, the mixed polymer of the core component will not be uniformly melted, and the spinning of the polymer will become unstable. On the other hand, after 60 minutes, the thermal deterioration of the AE composition progresses, resulting in a decrease in antistatic performance and a decrease in general yarn physical properties and yarn spinning stability. Adjustment of this melt residence time can be done, for example, by adjusting the volume of the polymer piping from the polymer melting zone to the spinning pack,
This is done by reducing the spatial volume of the polymer passages in the pack. An example of a core-sheath type composite method applied in the present invention will be explained using FIG. 3. FIG. 3 shows an example of a nozzle used in the present invention, where 1 is a nozzle introduction hole for a core component made of a mixture of an AE composition and polyamide, and 2 is a nozzle metering hole for the core component. Reference numeral 3 is a base introduction part for a sheath component made of polyamide, and 4 is a meeting part of the core component and sheath component. Reference numeral 5 denotes an introduction hole for the composite polymer into which the core components have merged, and the composite polymer is discharged from the nozzle discharge hole 6 and turned into a thread. In Fig. 3, if the center lines of 3 and 5 coincide, a concentric core-sheath composite yarn will be obtained, whereas if the center lines of 3 and 5 are shifted, an eccentric core-sheath composite yarn will be obtained. . The spinning speed in the present invention is 1500 m/min or more 9000 m/min
m/min or less, but preferably 2000m/min or more
8000m/min or less. Figure 1 below 1500m/min
As can be seen from the above, the deterioration in antistatic performance is slight, and there is no need to perform a core-sheath type composite. spinning speed
When the speed exceeds 9000 m/min, the difference in spinnability between the core component and the sheath component of the composite polymer discharged from the spinneret becomes significant, and good spinning stability cannot be obtained. Further, in a region where the spinning speed is 3000 m/min or more, foreign matter in the polymer and the state of dispersion of the AE composition in the core component polymer begin to affect the spinning stability. From this point of view, it is preferable to allow both the core component and the sheath component to pass through the polymer flow path before the polymer reaches the composite part in FIG. In particular, it is preferable to pass through an overlayer consisting of a 50×200 mesh sand layer and a sintered metal layer with an opening diameter of 5 μ to 50 μ. Examples of specific spinning methods used in the present invention include the so-called direct spinning and drawing method (DSD method) in which the spinning section and the drawing section are continuous when the spinning speed is 1500 m/min to 5000 m/min; ~7000
If the spinning speed is 3,000 m/min to 9,000 m/min, a heated atmosphere is passed through in a non-contact manner between spinning and winding. If there is, there is a method of contacting the spun yarn with a heated hot plate or spinning it around a heated roller and then winding it after heat treatment.In particular, when the spinning speed is 4500 to 9000 m/min, the spun yarn is immediately heated without being heat treated. Examples include winding methods, etc. In the present invention, a composite spinning method is adopted in which the antistatic agent to be added is concentrated in the core and the sheath does not substantially contain the antistatic agent, which is particularly effective under the high speed spinning conditions of the present invention. This is an effective means of ensuring stable yarn spinning. This is because adding additives to polymers generally reduces the spinning properties, so if the additives are localized in the core as in the present invention, the spinning properties of the core alone will be poor, but the sheath surrounding it will deteriorate. compensates for this instability, making it possible to obtain good yarn-spinning properties as a whole. [Effects of the Invention] As explained above, in the present invention, in order to obtain a polyamide fiber with excellent antistatic performance by a spinning method with a high spinning speed, instead of blending an antistatic component into the entire fiber, As a core-sheath type composite fiber,
A combination of localizing the antistatic component in the core, maintaining a high concentration of the antistatic component in the core, and limiting the melting residence time of the core component to suppress thermal deterioration. There are certain characteristics. By employing this spinning method, antistatic polyamide fibers with excellent antistatic performance and general yarn quality can be produced at high speed under stable spinning conditions. The present invention will be explained in detail below with reference to Examples. The methods for measuring the main physical properties used in the examples are shown below. (1) Relative viscosity of polyamide Ratio of flow time of a polymer solution containing 1.0 g of polymer using an Ostwald viscometer at 98.5% to flow time of H ₂ SO ₄ alone, measurement temperature: 25°C (2) Block polyether amide composition Relative viscosity of a substance The ratio of the flow time measured by dissolving a sample in 70% chloral hydrate to a concentration of 1% using an Ostwald viscometer and the flow time of 70% chloral hydrate alone. Measurement temperature: 25℃ (3) Electrical specific resistance (Rs) Wash the sample in a weak alkaline aqueous solution of 0.2% anionic surfactant for 2 hours using an electric washing machine, then wash with water and dry. Next, the sample was arranged into a fiber bundle with a length (L) of 5 cm and a fineness (D) of 1000 denier, and the temperature was controlled at 20°C and 23% RH for 2 days.
After conditioning the humidity, the resistance (R) of the sample is measured with an applied voltage of 100 V using a vibratory capacitive micropotential measuring device, and calculated using the following formula. RsR×D/9×10 ⁵ ×L×d R _s : Electrical specific resistance (Ω×cm) R: Resistance (Ω) d: Sample density (g/cm ³ ) D: Fineness L: Sample length (cm) Implementation Example 1 Polyethylene glycol with a number average molecular weight of approximately 3500 is reacted with acrylonitrile in the presence of an alkali catalyst to introduce cyano groups at both ends, and hydrogen is further added to this to make polyethylene glycol with an amino acid content of 95% or more at both ends. The basic polyethylene oxide diamine was synthesized. This diamine was treated with an equimolar amount of adipic acid to synthesize polyethylene oxide diamine adipate. This salt was mixed with ε-caprolactam, the weight percentage of the polyethylene oxide portion was adjusted to 40% by weight, 0.2% by weight of acetic acid was added, and polymerization was carried out in a nitrogen stream according to a conventional method. The obtained polymerization product is extracted with hot water and dried to obtain a block polyether amide (hereinafter referred to as composition P ₁ ) containing 40% by weight of a polyethylene ether component as polyalkylene ether (PAE).
Got pellets. The relative viscosity of the pellets obtained is
It was 2.10. The pellets consisting of the composition P ₁ were converted into polyε capramide pellets (relative viscosity:
A mixed pellet containing 3% and 6% by weight of 2.45) was spun using a normal pressure melter type spinning machine at a spinning speed of 500 to 6000 m/min, wound in one roll, and then stretched. 70 denier 24
A multifilament yarn of filaments was obtained. On the other hand, a 25% by weight blend of pellets consisting of P ₁ with the poly ε-capramide pellets was used as the core component, and only the poly ε-capramide, which did not contain the pellets consisting of P ₁ , was used as the sheath component, and both the core and sheath components were mixed. The core ratio was 12% by weight and 24% by weight using a composite spinneret with the configuration shown in Figure 3.
A core-sheath composite yarn of % by weight was spun. A multifilament yarn of 70 denier and 24 filaments was obtained from the spun yarn in the same manner as described above. In any case, in the spinning speed range of 1,000 to 4,000 m/min, longitudinal swelling occurs during winding, so winding of the undrawn yarn was completed within 5 minutes before this phenomenon became apparent. For stretching, a conventional stretching machine combining cooling pins and a hot plate was used, the temperature of the hot plate was set at 150°C, and the magnification was set so that the residual elongation after stretching was 40%. The material for the spinning pack was filled with 80 meshes of morundum fine powder to a thickness of 2 cm, and a sintered metal plate with an aperture of 30 μm was placed below this pack. In the case of core-sheath composite yarn, the melting residence time of the core component is at a core ratio of 24.
It took 7 to 12 minutes for % by weight, and 12 to 25 minutes for 12 % by weight. Table 1 shows the spinning conditions and yarn physical properties, and FIG. 1 shows the relationship between yarn specific resistance and spinning speed. Curves A and B represent uniform mixing of composition P ₁ throughout the yarn, corresponding to concentrations of composition P ₁ of 3% and 6% by weight, respectively. Curves C and D are core-sheath composite yarns, and the ratio of the core to the entire yarn (core ratio) is 12
% and 24% by weight. From curves A and B, it can be seen that in the case where the composition _P1 is mixed throughout the yarn, the specific resistance of the yarn deteriorates rapidly, especially in the region where the spinning speed exceeds 1500 m/min. In contrast, in the curves C and D of the present invention, the concentration of composition P ₁ or the concentration of the effective component PAE component (polyethylene oxide in this example) with respect to the entire yarn is the same as in the corresponding curves A and B. Despite this, the specific resistance of the yarn shows a low value,
Moreover, there is almost no influence of spinning speed, or even if there is, it is extremely small, and spinning speed of 6000
It can be seen that the specific resistance value is extremely low up to m/min. It is also clear that the core-sheath composite yarn of the present invention is superior in yarn physical properties represented by yarn speed and elongation in the high-speed range.

[Table] Example 2 Composition P ₁ produced in Example 1 was mixed into the core of a core-sheath composite yarn in the same manner as in Example 1, and the melting residence time of the core polymer was varied by changing the proportion of the core. A 70 denier 24 filament yarn was spun. Table 2 shows the results of yarn properties, spinnability, and secondary pressure of the metering pump when the concentration of core composition _P1 , core ratio, and melt residence time were varied.
The same spinning machine as in Example 1 was used. In this example, a method (DSD) was adopted in which the fiber was stretched immediately after spinning without winding. For stretching, set the stretching speed to 5000m/
The stretching ratio was changed by changing the spinning speed so that the residual elongation was 35 to 40%. Under the conditions of the present invention, the spinning speed was 2,500 to 3,000 m/min, the supply roller was of mirror surface type, and no heating was used. The surface of the stretching roller is satin-like.150
heated to ℃. The molten state of the polymer was determined by the pressure on the secondary side of the metering pump. In addition, yarn spinning properties are judged by the presence or absence of drips and the frequency of occurrence of single yarn breakage and total yarn breakage during drawing. Good and stable results are marked with ○, unstable are marked with ×, and intermediate levels are marked with △. displayed. As can be seen from Table 2, regardless of the concentration of composition _P1 in the core, when the residence time was 4 minutes, the secondary pressure of the metering pump was not stable and the spinning state was not stable. The yarn quality in Table 2 is the physical properties of the yarn that was collected in small quantities. On the other hand, if the residence time is 70 minutes, the secondary pressure of the metering pump will increase and the composition, especially in the core, will increase.
When the concentration of P ₁ was high (No. 40), the secondary pressure rose rapidly and no stable region could be found. In this long residence time region, the composition of the core
The yarn physical properties decreased regardless of the concentration of P ₁ , and the specific resistance increased rapidly. In the case of the melt residence time of the present invention, stable yarn-spinning properties were obtained without the above-mentioned troubles, and yarns with excellent yarn quality and specific resistance were obtained.

[Table] Example 3 Block polyetheramides containing 20% by weight and 60% by weight of polyethylene oxide (composition P ₂
and P ₃ ) pellets were obtained. The composition P ₁ used in Example 1 and the P ₂ and P ₃ polyε capramide pellets were mixed and subjected to DSD in the same manner as in Example 2.
We prototyped various core-sheath composite yarns (70 denier 48 filaments) using this method. The stretching speed at this time was 6000m/
It was a minute. The spinning speed was 3000-4000 m/min. As shown in Table 3, core compositions P ₁ , P ₂ , P ₃
By changing the mixing ratio of the yarn, the PAE concentration in the core was changed, and by changing the ratio of the core, the PAE concentration in the entire yarn was changed. Note that No. 42 and No. 51 are examples of mixed type yarns rather than core-sheath composite yarns. A static mixer as shown in Japanese Patent Publication No. 52-43926, etc., in which the mixed polymer shown as the composition of the core part in Table 3 is supplied to the melting part on the core side and the sheath side and incorporated into the spinning pack. (Static mixer)
The molten polymers on both sides were mixed using a spindle, and then spun and drawn using a normal, non-composite die. In addition, in No. 41 and No. 50, the melting residence time of the core component was insufficient, so the sand of the core component was removed, and only a sintered metal plate with an aperture of 20 μ was used, and the residence time was set to 5 minutes or more. When the PAE concentration in the core is 1.5% by weight, the core ratio is set to 80% by weight and the concentration is calculated based on the entire yarn.
Even at 1.2% by weight, the specific resistance value becomes large; on the other hand,
It is not a core-sheath type, but a mixed type, which increases the density of the yarn.
Even No. 42 with a content of 1.5% by weight has a large specific resistance value. Furthermore, even if the PAE concentration in the added block polyether amide was doubled in No. 49 and No. 50, the specific resistance value in both cases was large when the PAE concentration in the core was 1.5% by weight. In the case of No. 51, which is a mixed type, similar to No. 42, the specific resistance value shows a large value. On the other hand, as shown in Nos. 62, 63, and 64, the core
When the PAE concentration is as high as 48% by weight, the spinning stability is extremely poor regardless of the core ratio. Nos. 43 to 48 and No. 52 in which the PAE concentration in the core was in the range of 2.0 to 40% by weight for the above conditions outside the present invention.
-61 all exhibit good spinning stability and yarn specific resistance values. In addition, in the method of the present invention, Nos. 56, 57 and 61 are also used.
In this case, the PAE concentration in the core and the PAE concentration in the entire yarn is high, and a slight but negative effect on the spinning stability is observed.

[Table] Example 4 The spinning properties and antistatic performance were compared at spinning speeds in the range of 5000 m/min to 9000 m/min. The block polyetheramide _P1 of Example 1 was mixed in the same manner as in Example 1, and the same spinning and winding machine as in Example 1 was used to compare the homogeneous mixing type and the core/sheath composite type. In either method, the P ₁ concentration relative to the entire yarn was 6% by weight;
In addition, the concentration of PAE was set to 2.4%. No.70
~ With the core-sheath composite method of No. 75, the concentration of the PAE core is
25% by weight of Composition _P1 was mixed into the core so that the amount was 10% by weight. 100 as material in the spinning pack
A mesh morundum fine powder was filled to a height of 3 cm, and a sintered metal plate with an opening size of 15 μm was placed below the morundum fine powder. The yarn composition was 70 denier 24 filaments. Table 4 shows the spinning stability determined in the same manner as in Example 2 and the specific resistance value of the drawn yarn drawn in the same manner as in Example 1. In addition, the melting residence time of the core part of No. 70 to No. 75 is 10 to
It was hot in 13 minutes. Uniformly mixed yarns do not provide good spinning stability and at the same time the specific resistance value of the raw yarn shows a large value, whereas the core-sheath composite yarn of the present invention can maintain a stable spinning state at a spinning speed of 9000 m/min at the same time. It shows a good resistivity value. Furthermore, when comparing the specific resistance values of No. 13 and 14 of Example 1 with that of No. 66 of this example, No. 65 and
No. 66 shows a larger value. This was added because the overconditions were finer in this example.
This is presumed to be because the formation of _P1 compound streaks became unstable. On the other hand, Nos. 70 and 71 of the present invention have corresponding Nos.
Compared to 27 and 28, the values are almost the same. This is presumed to be because the added P ₁ compound was present at a high concentration in the core, so that the negative effect of the fiber fragmentation due to the wood was small.

【table】 [Brief explanation of drawings]

Figure 1 shows the relationship between spinning speed and specific resistance value of raw yarn. Curves A and B are for a homogeneous mixed system other than the present invention,
Curves C and D show the relationship between the core-sheath composite yarn of the present invention.
Figure 2 shows the relationship between the concentration of polyalkylene ether (PAE) compounds contained in the core and the PAE concentration of the entire yarn. FIG. 3 is an example of the structure of a die for manufacturing the composite yarn of the present invention.

Claims (1)

[Claims] 1 A polyamide composition (A) copolymerized with a polyalkylene ether compound and polyamide as core components,
A composite fiber whose sheath component is polyamide is spun at a speed of 1,500 m/min or more and 9,000 m/min or less, and the concentration of the polyalkylene ether component in the composition (A) relative to the core component is 2.0% by weight or more and 40%. weight or less, and the melting residence time of the core component is 5 minutes or more.
A method for producing antistatic polyamide fiber, characterized in that the manufacturing time is 60 minutes or less.