JPH0670303B2 - Roughened, antistatic polyester fiber and method for producing the same - Google Patents

Description

The present invention relates to a polyester-based synthetic fiber having a roughened surface and semipermanently antistatic property, and a method for producing the same.

At present, organic synthetic fibers have many excellent properties and are widely used in place of natural fibers, but because of their unique surface they have a unique so-called waxy feeling, and when they are dyed due to their mirror gloss. Compared with natural fibers such as wool and silk, it is difficult to obtain the depth of color, which is a drawback.

On the other hand, the present inventors have previously disclosed an invention capable of giving a deep color when dyed by giving a fine and complicated uneven shape to the fiber surface.
-120728 and Japanese Patent Laid-Open No. 55-107512.
However, even in these inventions, one of the drawbacks, which is that they are easily charged with static electricity, is still a problem to be improved.

By kneading a polyalkylene glycol as typified by Japanese Patent Publication No. 39-5214, the antistatic property can be imparted while being insufficient. However, since the polyalkylene glycol is insoluble in polyester, it is dispersed in the form of streaks parallel to the fiber axis, and this fiber is described in JP-A-54-120728 and JP-A-5-120728.
As shown in JP-A 5-107512, a surface structure that gives a deep color when dyed, that is, when an elution erosion treatment is performed to form fine and complex irregularities on the fiber surface, this portion is It elutes extremely quickly, forming long, large, streak-shaped depressions that cause diffuse reflection of light and, instead of increasing the depth of color, make it look rather white. Further, even if the block polyether ester is dispersed in a streak shape, as shown in JP-A-50-107215, etc.,
Similarly, antistatic performance can be added, but this is only the result of losing the depth of color.

The present invention is intended to solve the above problems, and to provide a polyester-based synthetic fiber having improved optical properties and touch, and also having excellent antistatic performance. It is intended to provide a method for industrially stably producing a polyester-based synthetic fiber.

That is, the present invention is a composite fiber in which the core-sheath component is both made of polyester, and the surface of the sheath component, which is the fiber surface, has fine irregularities due to elution and erosion treatment, and the thickness of the sheath component is 1 micron. (Μ) or more, and the core component has a molecular weight of 1,000 to 20,000 and a polyalkylene glycol (A) of 1 to 8% by weight. (R is an alkyl group or an aryl group or an alkylaryl group of C ₆ ^~ _30, M represents an alkali metal or alkaline earth metal atom, m represents the charge number of the metal M) surfactant represented by (B ) 0.5 to 5% by weight, 0.01 to 0.5% by weight of a hindered phenolic antioxidant (C) having a boiling point of 200 ° C. or higher, and the ratio (A + B + C) / of the above three to the weight% of the core component polyester (P) / P is in the range of 0.018 to 0.098, and the core / sheath composite ratio (Q) is defined as the ratio of the area of the core component to the area of the sheath component in the cross section perpendicular to the fiber axis.
Roughening, characterized by satisfying the range of 1/4 to 1/1,
Antistatic polyester fiber. Is the first invention, and "organic and / or inorganic fine particles are contained in the polyester."
0.5 to 10% by weight, the fine particles as secondary particles defined below, the size is 0.1 ~ 0.5μ,
At least 5 polyesters per 10μ ² are used as the sheath component, and the polyalkylene glycol (A) having a molecular weight of 1,000 to 20,000 is 1 to 8% by weight. (R is an alkyl group or an aryl group or an alkylaryl group of C ₆ ^~ _30, M represents an alkali metal or alkaline earth metal atom, m represents the charge number of the metal M) surfactant represented by (B ) Is 0.5 to 5% by weight and a boiling point of 200
Hindered phenolic antioxidant (C) above ℃ 0.
01-0.5% by weight, and the above three are the core component made of polyester contained in the range of 0.018-0.098 with respect to the weight% (P) of the core component polyester, and the thickness of the sheath is 1 micron or more, The area of the core component and the area of the sheath component in the cross section perpendicular to the fiber axis are compared, and the composite component is spun so that the core / sheath composite right (Q) is in the range of 1/4 to 1/1 to form the sheath component. A method for producing a roughened and antistatic polyester fiber, which comprises subjecting the surface of the fiber to elution and erosion with a solvent that is soluble or degradable with respect to the polyester.

[Definition of secondary particles] When viewed in an electron micrograph magnified to the extent that a single particle can be identified, the distance between the centers of adjacent single particles is less than twice the diameter of the single particle. Next particle.

Is a second invention.

In the present invention, in order to provide fine irregularities capable of imparting color depth to the fiber by the elution erosion treatment method on the surface of the fiber, and to obtain a synthetic fiber having excellent antistatic property, as the fiber, antistatic To be a core-sheath composite fiber composed of a core component that constitutes the component and a sheath component that imparts fine irregularities to the surface,
Use a specific combination and blending amount of polyalkylene glycol, surfactant, and antioxidant as the antistatic component added to the core component, and set the film thickness of the sheath component and the core / sheath composite ratio (cross-sectional area ratio). It is necessary to satisfy the specific range and the above specific requirements.

As the core component, that is, the antistatic component, the polyalkylene glycol (A), the surfactant (antistatic auxiliary) (B), and the antioxidant (C) are the weight of the polyester contained in the core component ( Equations (1) to (4) below for P) It is important to include in a range that satisfies For this reason, the core composite ratio Q, which is defined as the ratio of the area of the core portion to the area of the sheath portion in the cross section perpendicular to the fiber axis, is calculated by the following equation (5) 1/4 ≦ Q ≦ 1/1 ……………… Although it is also due to the range of the formula (5), the polyalkylene glycol and the surfactant are respectively (1), (2),
When the amount is less than the lower limit of the formula (4), it is considered that the target antistatic property is insufficient even if the depth of the color can be given by giving fine unevenness by elution and erosion treatment to the surface of the sheath component. I'm going out. In addition, if the amount of addition exceeds the upper limit, the antistatic performance will be saturated even if it is added more, and trouble such as the occurrence of troubles due to the thermal decomposition products of polyalkylene glycol and the decrease in viscosity when the polymer is melted is unnecessary. Will cause the drawback of.

As for the antioxidant, when it is added in an amount less than 0.01 wt%, the antioxidant effect is insufficient, and in particular, it causes the decomposition of polyalkylene glycol, and the decomposition product reacts with the polyester to accelerate the decomposition. Becomes Further, addition of 0.5 wt% or more not only saturates the effect but also causes troubles in the spinning process such as an increase in manufacturing cost and sublimation. In addition, hindered phenol type antioxidants are particularly effective against polyalkylene glycol, but in the polyester process,
If the boiling point is lower than 200 ° C, there will always be a process that exceeds 200 ° C, so that a process trouble may occur. Therefore, the hindered phenol antioxidant has a boiling point of 200 ° C or higher, more preferably 280 ° C.
The above is better.

The core / sheath composite ratio in the present invention is preferably in the range of the above formula (5), more preferably 1/2 to 1/3. Also, the thickness of the sheath should be at least 1μ. When the core / sheath composite ratio is larger than the right side of the equation (5), the number of sheaths is reduced as a result, and the sheath becomes extremely thin when the fiber cross section is viewed. Also, a polyester to which a polyalkylene glycol or a surfactant, which is originally water-soluble, is dissolved or decomposed extremely quickly as compared with a normal polyester when treated with a solvent having solubility or decomposability with respect to the polyester. That is, when the elution and erosion treatment is performed even by a slight eccentricity or pinhole of the core-sheath structure, the core component is dissolved, not only the antistatic property is deteriorated but also the color of the dyed product becomes a hollow structure. This will result in a white dull effect.
Furthermore, it has been clarified that the light fastness of the dyed product is deteriorated even if the antistatic property is imparted as shown in the above-mentioned JP-B-39-5214 and JP-A-50-107215. However, this is because the polyalkylene glycol is photo-deteriorated and the deterioration product deteriorates the dye, which means that the antistatic property is also deteriorated. According to the present invention, a fiber having extremely excellent light fastness can be obtained due to the light energy shielding effect of the sheath portion, but when the core / sheath ratio (Q) is larger than 1/1, this shielding effect is weakened to prevent light deterioration. I will begin to receive it. Further, the oxygen shielding effect is weakened, and for example, oxidative deterioration of the polyalkylene glycol during heat treatment such as false twisting and heat setting of the fabric is likely to occur, resulting in deterioration of antistatic performance. On the other hand, if the core / sheath ratio is less than 1/4, no photodegradation will occur and the core will not elute.
The desired antistatic property will be insufficient, and the durability will also decrease. For these reasons, the core / sheath composite ratio must be 1/4 or more and 1/1 or less, and the thickness of the sheath portion must be 1 μ or more.

As a method for obtaining the polyester as an antistatic component, the polyalkylene glycol, the surfactant and the antioxidant are separately mixed or preliminarily mixed at any time from the start of polyester synthesis to the spinning step. hand,
It can be added. In particular, it is preferable that the polyalkylene glycol and the antioxidant be mixed in advance to sufficiently perform dry deoxidation. Similarly, a surfactant is preferably used after being subjected to dry deoxidation. Further, the addition timing of these three components is preferably at the end of the process from the viewpoint of their heat resistance, and in particular, in the spinning process, injection is carried out at the front part of the spinning head, and a dynamic mixer or static mixer is used. It is more preferable to mix and spin the mixture.

Further, in the present invention, the sheath component polyester to be the fiber surface is to form fine irregularities on the surface of the sheath component to give depth of color by elution and erosion treatment, and in this sense, a normal polyester component is simply used. Even if it uses, the target surface cannot be obtained.

That is, the present invention is disclosed in JP-A-54-120728 and JP-A-5-120728.
The fine irregularities as shown in Japanese Patent Application Laid-Open No. 5-107512, that is, "a random surface having irregular irregularities is formed, and the irregularities forming the random surface are the concave portions existing in the outer peripheral direction perpendicular to the fiber axis. When the plane distance from the bottom point to the bottom point of the adjacent recess is X, 0.2 μ <X <0.7 μ is satisfied, and the irregularities are not at regular intervals per 10 μ plane distance in the outer peripheral direction perpendicular to the fiber axis. It is present at a density of 10 to 50, and there are fine irregularities of 50 to 200 mμ in the irregularities forming the random surface. " Here, when X is only 0.2 μm or less, the specular reflectance is not significantly reduced, and the depth of color after dyeing is not much different from the conventional one, and the effect of improving the frictional behavior is also insufficient. Further, when X is larger than 0.7 micron, the reflectance of visible light becomes high, the color tends to become dull and white, and the effect is rather lost. X is 0.2
Even if there are irregularities in the range larger than micron and smaller than 0.7 micron, if the density of the concaves (or convexes) does not become 10 or more per 10 microns in the outer peripheral direction perpendicular to the fiber axis, The effect of improving the color developability of the polyester fiber and the effect of improving the color depth are insufficient.

The peculiar surface structure as described above is realized by containing a specific number or more of particles atomized to the fine structure order inside the fiber, or by using a precipitated polyester component. .

As one of the methods, a polyester polymer containing 0.5 to 10% by weight of fine particles having an average diameter of 100 mμ or less is melt-spun, stretched, and used as it is or as a fabric, and the fiber surface layer is eluted and eroded by a solvent of the fiber. It can be obtained by letting it run. In this case, as the fine particles to be used, for example, silica sol, alumina sol, ultrafine metal powder,
Examples thereof include silica powder and the like, but are not limited thereto.

As another method of incorporating such fine particles into a polymer, two or more kinds of compounds are added during the process of producing the polymer, and a substance insoluble in the polymer formed from these compounds is finely precipitated. Another method is to use this as a fiber to elute and erode the surface layer.
Examples of such a compound include, but are not limited to, a combination of phosphoric acid and manganese acetate or magnesium acetate.

The amount of fine particles added is preferably 0.5% by weight or more and 10% by weight or less. If it is less than 0.5% by weight, a sufficiently fine and complicated surface structure cannot be obtained even if the surface layer elution treatment is carried out, and the effect of improving color depth and gloss becomes difficult to recognize. If more than 10% by weight is added, the processability in the spinning process becomes practically impossible. 0.5 ~ 10
The polyester fiber obtained by melt-spinning the polymer component contained by weight% has a streak in the fiber surface shape after stretching in the fiber axis direction, but it does not lead to a fine uneven surface, The above-mentioned surface irregularities are first achieved by subjecting the fiber surface layer to an elution treatment with a solvent that is soluble or decomposable. Elution of fiber surface Erosion erosion is preferably performed before dyeing when dyed in a woven or knitted form, and when dyed in a thread or cotton form, the cotton matte is eluted in a yarn or tow state before dyeing. The erosion treatment is preferable in terms of dyeing color matching. However, even if it is carried out after dyeing, the fine and complicated uneven shape of the surface is still obtained, and the surface elution treatment may be appropriately selected in a desired step.

Caustic soda, caustic potash, etc. are generally used as the solvent for leaching and eroding the polyester fiber, and they are suitable for the present invention, but not limited thereto.

The fine particles added or precipitated in the polymer exist in a single particle state or a so-called secondary particle state in which the single particles are aggregated. This is because the chip before spinning and the fiber after spinning are larger than the diameter of the single particle-shaped fine particles present in the chip or the fiber and within a thickness of several times the particle diameter, that is, several tens of millimicrons to 100. It can be observed by slicing with an ultramicrotome to a thickness of about a millimicron and enlarging the sliced ultrathin section at a high magnification with a transmission electron microscope. When the fiber surface elutes, non-uniform elution is affected by the dispersion state of the fine particles. In the case of complete uniform dispersion of single particles, when the fiber surface is eluted, it is difficult to have unevenness of several times or more of the single particle diameter, but in the case of moderate non-uniform dispersion state, during surface elution,
Areas having a high density of particles are liable to be eroded and eluted, and recesses are larger than areas having a low density, so that a desired uneven condition is exhibited. It is important that these irregularities appear randomly and also uniformly on the fiber surface.

In the present specification, a single particle is defined as a secondary particle when the distance between the particles is smaller than the diameter of the single particle, that is, the distance between the centers of adjacent single particles is close to each other and is less than twice the diameter. The size of the secondary particle is defined as the distance from the edge of the secondary particle to the maximum. The secondary particles according to this definition are the above-mentioned electron micrographs in which the single particle size is enlarged to a size that can be identified, for example, if the particle size is 10 millimicrons.
If the size is 100,000 times or more and 100 mm or more, the photograph magnified 10,000 times or more can identify the single particles and the secondary particles formed therefrom. That is, at least 5 secondary particles of 0.1 to 0.5 microns per 10 square microns.
It has been found that the state in which the individual pieces are present can exhibit the preferable random unevenness and fine unevenness of the present invention. However, when the single particles are extremely aggregated, it becomes an unstable factor in the fiber manufacturing process, which is not desirable, and it is preferable that the polymer 1 mm ² does not contain more than 20 secondary particles having a particle size of more than 5 microns. .

In the present invention, the fine particle-containing polyester obtained as described above is spun into a sheath portion, and a polyester having a polyalkylene glycol, a surfactant and an antioxidant added thereto is spun into a core portion, and if necessary, It is achieved by stretching and further subjecting the polyester to elution and erosion treatment. The cross section of the polyester fiber may be a round shape as long as the above formulas (1) to (5) are satisfied, or may be a five-leaf type, a triangle type, a T type, or another modified cross section as required. Further, the cross section may be deformed by higher-order processing such as false twist crimping processing.

The change in the frictional characteristics of the polyester fiber obtained by the above method before and after the leaching and erosion treatment is also peculiar. That is,
Before the treatment with alkali, the fiber surface has no fine irregularities and only shows the friction characteristics similar to those of ordinary polyester fibers. However, when this fiber is treated with an elution and erosion solvent, the static friction coefficient between fibers μs and the dynamic friction coefficient μd before the treatment
Compared with the difference (μs-μd), μs-μd after treatment is remarkably increased, and at least μs / μd after treatment becomes 1.6 or more, which is an excellent sliding texture fiber.

As a result of diligent studies on the frictional behavior of the fibers, the present inventors have found that even if the friction coefficient of the entire fiber is simply increased, the waxy feeling of the polyester-based synthetic fibers is eliminated, and the silky feel and the silky feel of cotton are felt. Admitted that he could not get.
In other words, if the fiber used is a woven or knitted structure with a simply increased friction coefficient, it will not only give a feeling of being depressed, but will also increase the hysteresis in the return recovery process during bending deformation and shear deformation of the cloth. It was found that the cloth loses its drape property and suppleness, and at low humidity, the cloth is entangled due to electrification due to friction, and further the texture is lowered. In order to change the surface feel of the fabric, not give a large hysteresis to the deformation recovery characteristics of the fabric, and prevent the flicker due to static electricity, the static friction coefficient should be increased, the dynamic friction coefficient should not be increased so much, and the antistatic property should be imparted. It was essential to do this. That is, the ratio μs / μd of the coefficient of static friction (μs) and the coefficient of dynamic friction (μd) is 1.7 or more, preferably 1.9 or more. If the antistatic property is imparted, the slip feeling is improved and even in extremely low humidity. Although it has been found that the feel is unprecedented, the present invention is to provide a fiber having exactly such characteristics and a method for producing the same.

The false twisted textured yarn according to the present invention exhibits an effect of particularly reducing glittering glitter. Therefore, there is an advantage in that the anti-glitter effect is exerted also on the DTY false twisted yarn of POY obtained by high-speed spinning.

The polyester polymer in the present invention means that at least about 75% of repeating structural units are (Provided that -G- is a divalent organic group containing 2 to 18 carbon atoms and connected to an adjacent oxygen atom by a saturated carbon atom) means a glycol dicarboxylate repeating structural unit. The terephthalate group may be the only dicarboxylate component of the repeating structural unit,
Or up to about 25% of the repeating structural units other dicarboxylates such as adipate, sebacate, isophthalate, bibenzoate, hexahydroterephthalate, diphenoxyethane-4,4'-dicarboxylate, 5-sulfoisophthalate groups It may include a rate. Examples of glycols include polymethylene glycols such as ethylene glycol, tetramethylene glycol and hexamethylene glycol, branched chain glycols such as 2,2-dimethyl-1,3-propanediol, diethylene glycol, triethylene glycol, tetraethylene glycol and the like. Mixtures of can also be used. The composition of the polyester forming the core part and the composition of the polyester forming the sheath part may be the same or different. Further, a matting agent, a gloss improving agent, a coloring agent, and other additives may be added.

As the polyalkylene glycol having a molecular weight of 1,000 to 20,000 used in the present invention, for example, polyethylene glycol, polypropylene glycol, polytetramethylene glycol, etc., are block or random copolymers thereof, and their ends are blocked with a phenyl group or the like. However, the present invention is not limited to these. Examples of the surfactant include alkali metal salts such as benzenesulfonic acid, dodecylbenzenesulfonic acid and nonylbenzenesulfonic acid, and alkaline earth metal salts, but are not limited thereto. As the antioxidant, for example, pentaerythrityl-tetrakis [3- (3,5-di-tert-tert-butyl-4-hydroxyphenyl) propionate], 3,
Diethyl 5-di-tert-butyl-4-hydroxybenzylphosphonate, triethylene glycol-bis-3- (3-
Tert-butyl-4-hydroxy-5-methylphenyl)
Examples thereof include propionate, but are not limited thereto.

Next, the present invention will be described with reference to examples, but the present invention is not limited to the above examples.

Example (I) Preparation of Polymer Aqueous silica sol having an average particle size of 15 mμ and a concentration of 20% by weight was mixed with ethylene glycol at room temperature and sufficiently stirred, and then silica was mixed so that the molar ratio of the ethylene glycol and terephthalic acid was 1.3. The containing slurry was adjusted. This slurry is fed to a batch type esterification tank with a reaction system temperature of 250 ° C and an internal pressure of 1.5 kg / cm ² while continuously distilling water to carry out an esterification reaction to obtain an esterified product with an esterification rate of 97%. Then, polymerization was carried out at 290 ° C. to obtain a polyester polymer having a polymerization degree of 95. The polymerization catalyst used was 400 ppm of Sb ₂ O ₃ .
In this way, polymers with an added amount of silica sol (as silica content) of 0 to 12% by weight are shown in Table-1.
-6 were prepared and assayed by the method described above and the phase contrast microscope.

Then 194 parts of dimethyl terephthalate, 1 part of ethylene glycol
34 parts and zinc zinc acetate 0.067 part were charged into a reactor and heated to 200 ° C. to carry out a transesterification reaction. Phosphoric acid 0.022
And 0.08 part of Sb ₂ O ₃ were added, 5 minutes later, 5 parts of manganese acetate tetrahydrate was added, and 5 minutes later, 1.34 part of phosphoric acid was added, and the mixture was stirred well. The temperature was gradually reduced while raising the temperature to 280 ° C, and finally the pressure was reduced to 1 mmHg or less to carry out the polymerization reaction, and a polyester polymer having a degree of polymerization of 98 (Table-1, A-
7) was obtained and secondary particles were assayed in the same manner.

Next, a slurry prepared by adjusting the molar ratio of ethylene glycol to terephthalic acid to be 1.2 is used as the reaction system temperature of 250
The water is continuously fed while distilling water to a batch type esterification tank with an internal pressure of 1.5 kg / cm ² to carry out an esterification reaction to obtain an esterified product with an esterification rate of 98%, followed by polymerization at 280 ° C. A polyester polymer having a degree of polymerization of 100 was obtained. A polyarlenking call, a surfactant, and an antioxidant were mixed and stirred in advance, deoxidized, and then mixed to obtain the polymers shown in Table 2.

(II) Production and Evaluation of Fibers Examples 1 to 6 and Comparative Examples 1 to 6 The polymers of symbol A shown in Table-1 were used as sheath components, and the polymers of symbol B shown in Table-2 were used as core components. The core-sheath composite fiber was composite-spun using two extruders, and 1000 m /
It was wound at a speed of a minute and then drawn 3 times to obtain a drawn yarn of 150 denier and 32 filament. Table 3 shows these test examples. However, in the spinning test using A-6 as the sheath component, it was impossible to obtain a sample because the polymer pressure was so high that the spinnability was extremely poor. This Example Comparative Example-1
And Using this drawn yarn as a knitted fabric, weight reduction treatment was performed at 98 ° C. using 1N NaOH aqueous solution to reduce the weight to about 5%. Then dyeing with black dye (Dianix Black manufactured by Mitsubishi Kasei)
HG-SE12% owf130 ℃ -50 minutes) was performed. When these knitted fabrics were observed with an optical microscope, it was confirmed that in Comparative Example-5, a part of the core component was dissolved away to form a hollow fiber. The reflectance of these knitted fabrics was measured with a spectrophotometer (Hitachi, Ltd. EPR-2 type), and the color depth was comprehensively judged by visual perception.
In addition, the uneven shape of the fiber surface was obtained from the scanning electron micrograph, and the half-life was also obtained at 20 ° C and 30% RH with a Honest meter to evaluate the antistatic property and the texture.

Next, the drawn yarn was subjected to false twisting, which was used as a knitted fabric, and a weight reduction treatment was performed under the same conditions to reduce the weight by about 5%, and this was dyed black similarly. This knitted fabric was judged under sunlight for the presence or absence of glitter.

Next, the drawn yarn is formed into a skein shape, similarly subjected to a reduction treatment of about 10% with a 1N NaOH aqueous solution (98 ° C), and the static friction coefficient (μs) and the dynamic friction coefficient (μd) are measured according to the radar method.
μs / μd was determined. Table 3 shows the results of the final comprehensive judgment by combining these results.

Example 7 A-3 was used as a sheath polymer, and polyethylene terephthalate ([η] = 0.68, titanium oxide was used as the core polymer was 0.8).
(With a content of 05% by weight), using polyethylene chips (molecular weight: molecular weight) in the middle of piping from the extruder to the spinning head during spinning.
11,000), triethylene glycol-bis- (3-tert-butyl-4-hydroxy-5-methylphenyl) propionate, and sodium dodecylbenzene sulfonate mixed and deoxygenated in advance with 6 and 1 in the core component, respectively. , 0.3% by weight to the core component side, mixed with a static mixer (Toray, high mixer, 10 stages), and spun to a core / sheath composite ratio of 1/2. The following evaluation was performed in the same manner as in Examples 1 to 6, and good results were obtained as a comprehensive judgment. The results are shown in Table-3.

Claims (2)

[Claims] 1. A composite fiber whose core-sheath component is made of polyester, and the surface of the sheath component, which is the surface of the fiber, has fine irregularities due to elution and erosion treatment, and the thickness of the sheath component is 1 micron ( μ) or more and the core component is 1 to 8% by weight of polyalkylene glycol (A) having a molecular weight of 1,000 to 20,000. (R is an alkyl group or an aryl group or an alkylaryl group of C _{6 ~ 30,} M represents an alkali metal or alkaline earth metal atom, m represents the charge number of the metal M) surfactant represented by (B ) Is 0.5 to 5% by weight, the hindered phenolic antioxidant (C) having a boiling point of 200 ° C. or higher is 0.01 to 0.5% by weight, and the ratio (A + B + C) of the above three to the weight% of the core component polyester (P). / P exists in the range of 0.018 to 0.098, and the core / sheath composite ratio (Q) is defined as the ratio of the area of the core component to the area of the sheath component in a cross section perpendicular to the fiber axis.
Roughening, characterized by satisfying the range of 1/4 to 1/1,
Antistatic polyester fiber. 2. Polyester contains 0.5 to 10% by weight of organic and / or inorganic fine particles, and the fine particles have a size of 0.1 to 0.5 μm as secondary particles defined below.
A at, 10 [mu] least five polyesters present the per ² as the sheath component, polyalkylene glycol (A) is 1-8% by weight of molecular weight from 1,000 to 20,000, the formula (R is an alkyl group or an aryl group or an alkylaryl group of C _{6 ~ 30,} M represents an alkali metal or alkaline earth metal atom, m represents the charge number of the metal M) surfactant represented by (B ) Is 0.5 to 5% by weight and a boiling point of 200
Hindered phenolic antioxidant (C) above ℃ 0.
01-0.5% by weight, and the above three are the core component made of polyester contained in the range of 0.018-0.098 with respect to the weight% (P) of the core component polyester, and the thickness of the sheath is 1 micron or more, Composition of the sheath component by composite spinning so that the ratio of the area of the core component to the area of the sheath component in the cross section perpendicular to the fiber axis and the core / sheath composite ratio (Q) are in the range of 1/4 to 1/1. A method for producing a roughened and antistatic polyester fiber, which comprises subjecting the surface of the fiber to elution and erosion with a solvent that is soluble or degradable with respect to the polyester.