JPH11222726A - Antistatic polyester fiber and its woven or knit fabric - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain the subject fiber giving a woven or knit fabric having high antistaticity, excellent dry feeling and squeaking feeling and exhibiting subdued luster and high water absorption by including a polymer having antistaticity and forming linear grooves extending in the direction of fiber axis. SOLUTION: The objective fiber such as a sheath-core conjugate fiber containing preferably an antistatic polymer in the core part is produced by including a polymer having antistaticity and subjecting the fiber to a thinning treatment preferably with a hot alkaline aqueous solution to form linear grooves extending in the direction of fiber axis.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a polyester antistatic fiber, a different shrinkage mixed fiber and a woven or knitted fabric using the same, and more particularly, to a polyester antistatic fiber having a streak groove extending in the fiber axis direction. And a woven or knitted fabric using the polyester fiber and the polyester antistatic fiber as at least a low shrinkage component, and a woven or knitted fabric using the same. The present invention relates to a polyester antistatic fiber and a hetero-shrink mixed yarn for obtaining a woven or knitted fabric having a feeling of calm and a calm gloss and good water absorption, and a woven or knitted fabric using the same.

[0002]

2. Description of the Related Art Polyester fibers are widely used for clothing because of their excellent functionality. Particularly in the field of women's clothing, there is a strong demand for further improvement in texture with the recent trend toward luxury goods. For this reason, a number of techniques have conventionally been proposed for forming a fine textured surface on the polyester fiber to give a dry touch texture or to enhance the color development. For example, JP-A-54-120728, JP-A-55-107512, and JP-A-55-107512
JP-A-51819, JP-A-3-124852 and the like propose a method of imparting a dry-touch texture or improving coloring by blending various particles and forming fine irregularities on the fiber surface. However, none of them could give a luxurious dry touch texture and silky squeaky feeling.

On the other hand, as a method other than forming fine irregularities by blending particles, for example, Japanese Unexamined Patent Publication No.
JP-A-98474 and JP-A-6-41836 propose a method of compounding an additive that is incompatible with polyester. However, in the method of adding an additive that is incompatible with the polyester proposed in the publication, the fibers are fibrillated, and although a fabric having a fluffy feeling is obtained, a high-class dry touch texture, A silky squeaky feeling could not be imparted.

Japanese Patent Application Laid-Open No. 63-6160 proposes a method in which a modified polyester and an unmodified polyester are mixed and spun to reduce the weight, thereby improving the color developability. However, it has been found that the fiber obtained according to the publication has insufficient fibrillation resistance because it has a large number of micropores inside the fiber, and the fibrillation significantly reduces the color development.

Similarly, Japanese Patent Application Laid-Open No. Hei 7-189027 proposes a method of improving the color developability by spinning a mixture of a modified polyester and an unmodified polyester and subjecting the mixture to weight reduction processing. However, since the fiber obtained by the publication is a fiber having a degree of flatness of 2 to 4, the fibril resistance is not sufficient because the flat surface is preferentially arranged on the surface of the woven fabric when the woven fabric is used. It was also found that the coloring property was remarkably reduced.

Therefore, the prior art was not excellent in fibril resistance and could not impart a dry feeling and a squeaky feeling.

Regarding antistatic properties, many antistatic agents and methods for processing them have been proposed. However, although some antistatic agents have a durable effect, they are not sufficient and are likely to be reduced by washing or the like. Therefore, for the purpose of improving the durability, for example, a method has been proposed in which a polymer having antistatic properties is compounded into a core-sheath type as disclosed in Japanese Patent Application Laid-Open No. 55-122020. In addition, there are many variations such as application to fibers with irregular cross-sections and mixed yarns containing antistatic fibers. In addition to antistatic properties, fukurami (Japanese Patent Application Laid-Open No. 62-149927), Various functions such as a marbling effect (JP-A-61-167041) have been provided. However, in each case, although antistatic properties were obtained, it was not possible to impart a luxurious dry touch texture and silky squeaky feeling.

[0008]

SUMMARY OF THE INVENTION The object of the present invention is to provide a polyester antistatic fiber and a hetero-shrinkage blended fiber, which cannot be achieved by the above-mentioned prior art, and in which, in addition to antistatic properties, dryness and squeaky feeling are remarkably improved. An object of the present invention is to provide a yarn and a woven or knitted fabric using the same.

[0009]

SUMMARY OF THE INVENTION An object of the present invention is to provide a polyester fiber having a streak-like groove extending in the fiber axis direction and comprising a polymer having antistatic properties. This can be achieved by conductive fibers.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail.
The polyester antistatic fiber of the present invention needs to have a stripe groove extending in the fiber axis direction. By forming the streaks extending in the fiber axis direction, the contact length of the streaks between the single fibers can be lengthened, resulting in a luxurious dry touch texture, silky squeak In the method in which streaky grooves extending in the fiber axis direction are not formed, or the method in which fine irregularities are formed by blending particles, there is a high-grade feeling which is the object of the present invention. It cannot give a dry touch texture or silky squeaky feeling.

Further, it is necessary to include a polymer having antistatic properties. In the fiber having the above-mentioned streak groove,
Static electricity is more likely to be generated due to the contact between the fibers as compared to the fibers having no streak grooves. Therefore, it is effective to include a polymer having antistatic properties in the fiber. Furthermore, even if a woven or knitted fabric having a good dry touch and squeaky feeling can be obtained using fibers having streak grooves, a finishing agent (antistatic agent) is applied to the surface layer of the fibers as an antistatic treatment at the final finishing stage. Then, we found that the previous dry touch and squeaky feeling disappeared, and as a result of various investigations, it was possible to obtain a good dry touch and squeaky feeling without using a finishing agent (antistatic agent) in the final finishing stage. It is possible to provide a woven or knitted fabric that maintains the following properties.) Polymers having antistatic properties include copolymers containing polyoxyalkylene chain components, polyamines, polyacrylates, diglycidyl ethers, terephthalic acid, and others. And polyether amide compositions containing an acid component of the formula (I). Each of these may be used alone, or may be mixed with another polymer as long as the effects of the present invention are exhibited.

The polymer having antistatic properties may be blended, compounded into a concentric core sheath and an eccentric core sheath, or may be a sea-island shape having a plurality of cores.
In addition, the shape may be circular or non-circular, but among these, it is preferable to be composited with a concentric core sheath. In other words, in order to exhibit good antistatic performance, it is preferable that the polymer having antistatic properties is continuously present in a constant amount in the fiber axis direction. Therefore, it is preferable to collect them at the center as much as possible. In addition, if a polymer having antistatic properties is compounded in a concentric core-sheath, when the fibers come into contact with each other, the surfaces of the respective fibers are subjected to minute easy deformability. As a result, the contact area between the fibers is increased, and the effect of improving the level of the squeaking feeling can be obtained in addition to the antistatic performance.

The composite ratio of the polymer having antistatic properties can be arbitrarily selected. However, in order to provide good antistatic properties, from the viewpoint of further suppressing the quality deterioration due to fibrillation, preferably, 5 to 30% by weight.

The cross-sectional shape of the polyester fiber of the present invention is as follows:
Although it may be circular or irregular, it is preferably a multi-lobed polyester fiber having 3 to 8 leaves.
Here, the fiber cross-sectional shape is a shape when it is assumed that there is no groove. This is because a multi-leaf cross-sectional shape of 3 leaves or more and 8 leaves or less can express silky touch or dry touch, and can increase a sense of quality. If it exceeds eight leaves, the fibril resistance deteriorates, which is not preferable.

The polyester antistatic fiber of the present invention is obtained by mixing two or more kinds of polymers having different solubility in a solvent, and blending or compounding the polymer having antistatic properties with the mixture.
It can be produced by removing the easily-eluting polymer with a solvent. However, since the use of a special solvent may cause environmental pollution, it is preferable to form streak grooves using a hot alkali aqueous solution generally used for weight reduction processing of polyester fibers. Is preferred.

In order to form streak grooves using a hot alkali aqueous solution, a combination of two or more polymers used in addition to the antistatic polymer is compatible with each other and is dissolved in a hot alkali aqueous solution. A method in which two or more polyesters having a speed ratio of 5 or more are mixed and melt-spun is preferred.

Further, in the polyester fiber of the present invention, streaky grooves extending in the fiber axis direction have a distribution in the frequency of occurrence of streak grooves in a single fiber constituting the polyester fiber, and the peripheral length of the single yarn cross section Maximum value G of the number of streak grooves per 3 μm
It is preferable that the ratio of max and the minimum value Gmin, Gmax / Gmin, be 1.5 or more and 15.0 or less. Gma
When x / Gmin is 1.5 or more and 15.0 or less, the fibril resistance aimed at by the present invention is sufficiently satisfied, and a luxurious dry touch texture and silky squeaky feeling are imparted. You can do it. Further, in order to simultaneously satisfy fibril resistance, a high-grade dry touch texture, and a silky squeaky feeling, Gma
The ratio of x / Gmin is preferably 2.0 or more and 10.0 or less.

(The frequency of occurrence of streak grooves was measured by scanning a fiber cross-section photograph (5000 times) with a scanning electron microscope and determining the number of streak grooves per 3 μm perimeter of a single yarn cross section. And Gmax / Gmin is calculated from the average value.)
In addition, the frequency of occurrence of streak grooves was measured by scanning a fiber cross-section photograph (5000 times) with a scanning electron microscope and measuring the number of streak grooves at 10 points per 3 μm perimeter of a single yarn cross section. Then, Gmax / Gmin is calculated from the average value. In addition, the streak groove extending in the fiber axis direction in the present invention means that the groove is formed at an angle of 30 degrees or less with respect to the fiber axis direction in the major axis direction of the groove, It is sufficient that 70% or more of the grooves formed on the fiber surface are streaky grooves extending in the fiber axis direction.

A preferable form of the streak grooves for imparting a luxurious dry touch texture and a silky squeaky feeling is that the ratio of the width to the length of the streak grooves to the fiber axis direction is 10%. Not less than 50. The fibril resistance can be further improved by setting the ratio of the width and the length of the streak grooves to the fiber axis direction to be 10 or more and 50 or less. A more preferable shape of the streak groove for improving the fibril resistance is such that the ratio of the width to the length in the fiber axis direction is 10 or more and 3 or more.
0 or less.

The width and length of the streak grooves in the fiber axis direction were measured with a scanning electron microscope using a fiber surface photograph (30).
(00 ×) is taken, and the maximum width and length of the streak-like groove are measured at 10 places, and the average value is calculated.

Further, in the case of a multi-leaf cross-sectional shape having three to eight leaves, the frequency of occurrence of the streaky groove formed at the tip of the leaf may be the minimum value Gmin. preferable. In addition, the polyester antistatic fiber of the present invention is used as a hetero-shrink mixed yarn to impart a luxurious dry touch feel and a swelling feeling as well as a silky feeling when made into a woven fabric. This is also a preferred mode of use. When used as a different shrinkage mixed fiber, it is preferable to use the polyester antistatic fiber of the present invention at least as a low shrinkage component constituting the different shrinkage mixed fiber,
More preferably, it is used as a low shrinkage component and a high shrinkage component constituting the different shrinkage mixed fiber. Further, by using the polyester antistatic fiber of the present invention only for at least the low shrinkage component, the antistatic performance can be effectively exhibited, a swelling feeling is obtained, and the effect of the streaky grooves extending in the fiber axis direction is improved. Express. That is, it is possible to sufficiently impart a luxurious dry touch texture and a silky squeaky feeling.

Further, in order to give a feeling of coarse hardness and a sufficient swelling when the woven or knitted fabric is used, the difference in boiling water shrinkage ratio between the high shrinkage component and the low shrinkage component must be 7% or more and 30% or more. %
The following is preferred. More preferably, the difference in the boiling water shrinkage is in the range of 10% or more and 25% or less.

The boiling water shrinkage is measured by the following method. After dividing the different shrinkage mixed fiber into a high shrinkage component and a low shrinkage component, the sample length (Lh
0, L10), and then for 20 minutes under no load condition,
Perform boiling water treatment. After the treatment, the sample length (Lh1, L11) is measured under a load of 0.1 g / d. BWSh = [(Lh0−Lh1) / Lh0] × 100 (%) BWS1 = [(L10−L11) / L10] × 100 (%) Difference in boiling water shrinkage (△ BWS) = BWSh−BWS1

As a method of mixing two or more kinds of polyesters used in addition to the polymer having antistatic properties, a method of separately melting two or more kinds of polymers and kneading them with a mixer is a method of mixing two or more kinds of polymers in a chip state. And melting. However, in a method in which two or more kinds of polymers are separately melted, kneaded with a mixer, and once made into a master chip, and then spun, the effect of mixing two or more kinds of polyesters is lost, that is, the fibers are elongated in the fiber axis direction. Streaks cannot be formed.

The polyester in the present invention is terephthalic acid as a main acid component, and at least one selected from ethylene glycol, tetramethylene glycol, cyclohexane-1,4-dimethanol, pentamethylene glycol, and hexamethylene glycol. It is a polyester serving as a main glycol component, and may have a third component of 40 mol% or less copolymerized. Preferred copolymerization components include adipic acid, sebacic acid, isophthalic acid, diphenyldicarboxylic acid, and naphthalenedicarboxylic acid.
Basic acids, oxyacids such as oxybenzoic acid, and glycols such as diethylene glycol, propylene glycol and polyethylene glycol; 5-sodium sulfoisophthalic acid; and 2,2bis {4- (2-hydroxyethoxy) phenyl} propane And polyesters obtained by copolymerizing one or more of them. However, in the case of polyethylene glycol, if the number average molecular weight exceeds 10,000, the reactivity in polymer synthesis is remarkably reduced, and the unreacted material becomes incompatible with polyester and may significantly impair the spinnability. It is preferable to use those of 10,000 or less.

The ratio of the dissolution rate to the hot alkaline aqueous solution is measured by the following method. Two or more kinds of polyesters used for the polyester fiber of the present invention are each a circular cross-section fiber having the same denier, and each fiber is treated with a 3% aqueous solution of caustic soda at a temperature of 98 to 100 ° C. for 30 minutes in a bath 1: 125. Is determined from the following equation, and the ratio of the weight loss rates is determined as the ratio of the dissolution rate to the hot alkaline aqueous solution. Weight loss rate (%) = [(W0−W1) / W0] × 100 where W0: weight before alkali treatment, W1: weight after alkali treatment.

More preferably, the mixing ratio of a polyester having a low dissolution rate to a hot alkali aqueous solution and a polyester having a high dissolution rate is 10/90 to 50/50.
It is preferable to form streak-like grooves extending in the fiber axis direction and to sufficiently impart a high-quality dry touch texture and silky squeaky feeling.

The reduction processing may be performed in any step, but is preferably performed after weaving and knitting in consideration of production stability.

The effect of the present invention is not impaired by the winding operation of the polyester fiber of the present invention.
As the winding operation, any process such as a method of once winding as an undrawn yarn and then drawing or a high-speed spinning method can be applied. Further, yarn processing such as false twisting or air entanglement may be performed as necessary.

Further, as a method for producing a different shrinkage mixed fiber using the polyester fiber of the present invention as at least a low shrinkage component, any of a conventionally known post-fiber mixing method and a spinning mixing fiber method can be used. It may be manufactured.

In the case of producing a woven or knitted product using polyester fibers and / or hetero-shrinkage mixed yarns, there is no restriction on the weaving machine, woven or knitting structure, etc.
By using at least a part, the object of the present invention, in addition to good antistatic properties, significantly improved dry feeling,
A woven or knitted fabric having a squeaky feeling, a calm glossiness, and a good water absorption can be produced.

[0032]

The present invention will be described in more detail with reference to the following examples. Each characteristic value in the examples was obtained by the following method. A. Feeling characteristics (dry feeling, squeaky feeling, swelling feeling) For each item, a sensory test was performed by a pairwise comparison of the sample with a reference sample, and evaluated on a 4-point scale. Then, they were comprehensively evaluated, and “Excellent” was indicated by “◎”, “Excellent” was indicated by “○”, “Normal” was indicated by “△”, and “Inferior” was indicated by “X”. The reference sample is a polyester filament yarn having the same fineness and the same number of filaments as the sample original yarn used as a standard product, and is subjected to the same weaving and processing as the sample. And

B. Fibril resistance Using a Gakushin type flat abrasion machine for friction fastness test, using a georgette made of 100% polyethylene terephthalate as a friction cloth, applying a test cloth under a load of 500 g under a load of 500 g.
The state of occurrence of fibrillation was evaluated by a three-step evaluation after the surface was worn 00 times. "Excellent" is ○, "Normal" is △,
“Inferior” is indicated by a cross.

C. Intrinsic viscosity 0.1g sample per 10ml orthochlorophenol
Was dissolved and measured at 25 ° C. using an Ostwald viscometer.

D. Electric resistivity The sample is washed for 2 hours in a weak alkaline aqueous solution of 0.2% anionic surfactant using an electric washing machine, washed with water, and dried. Then, the sample was 5 cm long (L). Fineness (D) 20 in a 1000 denier fiber bundle
After adjusting the humidity at 40 ° C. and 40% RH for 2 days, the resistance of the sample is measured at an applied voltage of 500 V by a vibration capacitance type micro-potential measuring device, and calculated by the following equation.

Ρ = (R × D) / (9 × 10 ⁵ × L × d) ρ; volume resistivity (Ω) R; resistance (Ω) d; sample density (g / cm ³ ) D; fineness (D) L; sample length (cm)

E. Friction band voltage Using a Kyoto University Kaken type rotary static tester, a plain weave kakinan No. 3 (100 g / m ² basis weight) of cotton that has been previously punched, refined, and bleached as a friction object cloth, has a rotor rotation speed of 400 rpm, an applied voltage of 100 V, Temperature 20 ° C,
This is a value measured in an atmosphere with a relative humidity of 30%.

Examples 1 to 5 and Comparative Examples 1 and 2 As a polymer having antistatic properties, pellets composed of a block polyetheramide composition were prepared using an intrinsic viscosity [η] of 0.65.
10% by weight of polyethylene terephthalate pellets
The mixed pellets are compounded as a core component by 15%,
Polyethylene terephthalate having an intrinsic viscosity [η] of 0.65 and 10.0 mol% of 5-sodium sulfoisophthalic acid and an isophthalic acid of 15 having an intrinsic viscosity [η] of 0.69;
The polymer stream obtained by melt-mixing the modified polyester copolymerized at a weight ratio of 75/25 by mol% as a sheath component was discharged from a spinneret at a spinning temperature of 292 ° C. by a usual spinning machine.
The film was wound at a speed of 00 m / min (Example 1).

As shown in Table 1, winding was performed while changing the compounding ratio of the antistatic polymer compounded as the core component (Examples 2 and 3). The sea-island shape (ten islands) fibers were wound in the same manner by changing the base (Example 4). Further, the polymer having an antistatic agent was blended with the above-mentioned melt-blended polymer stream, and then wound up similarly (Example 5).

The ink was discharged from the die and wound up.

Further, as shown in Table 1, the ratio of the modified polyester to be melt-mixed into the sheath portion or the composite ratio of the polymer having an antistatic agent to be compounded as the core component was set to zero, and the other conditions were the same as in Example 1. (Comparative Examples 1 and 2).

Subsequently, these undrawn yarns were drawn by a factor of 2.5 using a conventional hot roll-hot plate drawing machine to obtain 50-denier 24-filament round-section fibers. At this time,
The ratio of the dissolution rate of the modified polyester to the unmodified polyester in a hot aqueous solution of 3% by weight of sodium hydroxide at 98 ° C. was about 150 times.

After two fibers of this fiber are combined, the yarn is twisted, woven as a warp and a weft, and woven.
Table 1 shows the results of evaluating the fiber surface state and the obtained antistatic performance characteristics and woven fabric characteristics by performing 25% weight reduction processing under the conditions of 98 ° C. using a weight% aqueous solution.

[0044]

[Table 1] Examples 6 to 9 In Example 1, winding and stretching, weaving were performed in the same manner as in Example 1 except that the shape of the die was changed as shown in Table 2.
Alkali weight loss processing. Table 2 shows the results of the evaluation of the fiber surface condition and the obtained woven fabric characteristics together with Example 1.

In the levels of Examples 6 to 9, the frequency of occurrence of streak-like grooves formed at the tip of the leaves was the minimum value Gmin. In Examples 6, 7 and 8, the shape and distribution of the streaky grooves formed on the fiber surface are good, and the obtained woven fabric is a woven fabric which is rich in dry feeling and squeaky feeling and also excellent in fibril resistance. there were.

In Example 9, fibrillation was observed in a shape in which the leaves of the fiber cross section were broken, and the fibril resistance was slightly inferior. In Example 1, the distribution of the streaks formed on the fiber surface was uniform, and the streaks were arranged neatly on the surface of the woven fabric. Therefore, the dry feeling and the feeling of creaking were excellent, but the fibril resistance was normal. Level.

[0047]

[Table 2] Examples 10 to 13 Spinning and stretching were performed in the same manner as in Example 6 except that the mixing ratio of the polyethylene terephthalate and the modified polyester as the sheath component was changed as shown in Table 3.
A three-leaf cross section fiber having 0 denier and 24 filaments was obtained.

After the two fibers are conjugated, they are sweetly twisted and woven as warp and weft yarns.
Table 3 shows the results of evaluating the fiber surface state and the obtained fabric characteristics by performing weight reduction processing under the condition of 98 ° C. using a weight% aqueous solution. Note that, at each level, the frequency of occurrence of streak-like grooves formed at the tip of the leaf portion was the minimum value.

In Examples 11 and 12, the shape and distribution of the streaky grooves formed on the fiber surface were good, and the obtained woven fabric was rich in dry feeling and squeaky feeling and also excellent in fibril resistance. Met.

In Example 10, the ratio of the length and width of the streak grooves formed on the fiber surface was slightly small because the mixing ratio of the polymer having a high dissolution rate was small. The fabric had good feeling and good fibril resistance.

In Example 13, although the distribution of the streaky grooves formed on the fiber surface was slightly small, the fibril resistance was slightly low, but the fabric was excellent in dry feeling and squeaky feeling.

[0052]

[Table 3] Examples 14 to 17 Three-leaf cross section fiber of 50 denier 24 filament of Example 6 and 50 denier 24 having a boiling water shrinkage ratio shown in Table 4.
Weaving and weight reduction were performed in the same manner as in Example 6, except that the three-lobed high-shrinkage fibers of the filament were combined. Table 4 shows the results of evaluating the obtained woven fabric characteristics.

The fabrics obtained in Examples 15 and 16 are:
The fabric was excellent in dry feeling, squeaky feeling and swelling feeling, and also excellent in fibril resistance.

In Example 14, although the difference in shrinkage between the high shrinkage fiber and the low shrinkage fiber was small, the swelling feeling was slightly insufficient. However, the woven fabric was excellent in dryness and squeaky feeling and also excellent in fibril resistance. Met.

In Example 17, since the difference in shrinkage between the high shrinkage fiber and the low shrinkage fiber was large, the obtained woven fabric was slightly fluffy, and the fibril resistance also showed slight breakage of single yarn. However, the fabric was excellent in dry feeling and squeaky feeling.

[0056]

[Table 4] Example 18 A modified polyester obtained by copolymerizing 8% by weight of polyethylene glycol having an intrinsic viscosity [η] of 0.67 and a number average molecular weight of 20,000 and 2 mol% of 5-sodium sulfoisophthalic acid in Example 1 was used. Spinning and drawing were carried out in the same manner as in Example 6 except that they were used to obtain 50-denier 24-filament three-leaf cross-section fibers. 3% by weight of polymer at this time sodium hydroxide 98 ° C
The ratio of the dissolution rate to the hot aqueous solution was about 6 times.

After two fibers of this fiber are plied, they are sweet-twisted, woven as warp and weft, and woven.
Table 5 shows the results of evaluating the fiber surface state and the obtained woven fabric characteristics by performing weight reduction processing under the condition of 98 ° C. using a weight% aqueous solution.

In Example 18, since the distribution of the streaks formed on the fiber surface was small and the ratio of the length to the width of the streaks was large, the dry feeling and the squeaky feeling were good, but the fibril resistance was low. The sex was slightly inferior.

[0059]

[Table 5]

[0060]

The object of the present invention is to provide a polyester antistatic fiber and a hetero-shrinkage mixed fiber having markedly improved dry feeling and squeaking feeling in addition to antistatic properties, and a woven or knitted fabric using the same. .

[Brief description of the drawings]

FIG. 1 is a schematic view showing an example of a fiber cross section of the present invention.

[Explanation of symbols]

 A. Streak groove B. Polymer having antistatic properties C.I. polyester

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁶ Identification code FI D03D 15/00 101 D03D 15/00 101 15/04 15/04 A D06M 11/38 D01F 6/92 307A // D01F 6/92 307 307B 307F 307P D06M 5/02 E

Claims (8)

[Claims] 1. A polyester antistatic fiber having a streak-like groove extending in the fiber axis direction, comprising a polymer having antistatic properties. 2. The polyester antistatic fiber according to claim 1, which is a core-sheath composite fiber containing a polymer having antistatic properties in a core portion. 3. The polyester antistatic fiber according to claim 1, wherein the cross-sectional shape of the fiber is a multi-leaf cross section of 3 to 8 leaves. 4. The polyester antistatic fiber according to claim 1, wherein the streak-like grooves extending in the fiber axis direction are formed by reducing the weight with a hot alkaline aqueous solution. 5. The frequency of occurrence of streak grooves in a single fiber is distributed, and the ratio of the maximum value Gmax and the minimum value Gmin of the number of streak grooves per 3 μm of peripheral length of a single yarn cross section, Gmax / G
min is 1.5 or more and 15.0 or less, and the ratio of the width to the length of the streak grooves with respect to the fiber axis direction is 10 or more and 50 or less. The described polyester antistatic fiber. 6. In a single fiber constituting a multi-leaf cross-sectional polyester fiber having a fiber cross-sectional shape of 3 leaves or more and 8 leaves or less, the frequency of occurrence of streaky grooves formed at the leaf tip is a minimum value Gmin.
The polyester antistatic fiber according to claim 5, wherein: 7. A hetero-shrinkage mixed fiber comprising at least a low-shrinkage component polyester fiber constituting the hetero-shrinkage mixed fiber is the polyester antistatic fiber according to any one of claims 1 to 6. . 8. A woven or knitted fabric characterized by using at least a part of the polyester antistatic fiber and / or hetero-shrinkage mixed fiber according to claim 1.