JP2001262438A - Antistatic conjugate filament - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an antistatic conjugate filament which has a good performance, does not produce scum, has a good weaving property, and is suitable for a high mesh gauze woven fabric. SOLUTION: This antistatic conjugate filament is characterized by comprising a sheath-core conjugate filament which comprises a fiber-forming polymer as a sheath component, and as a core component, a resin composition obtained by adding 10 to 30 wt.% of a metal organic sulfonate to the remainder of a polymer that has an average mol.wt. of 10,000 to 70,000 and comprises 70 to 95 wt.% of a polyalkylene glycol having an average mol.wt. of >=6,000 and the remainder of an organic dicarboxylic acid or its ester, wherein the core component is used in an amount of 0.3 to 5 wt.% based on the sheath component, and wherein the core component in the conjugate filament is not exposed to the surface layer.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an antistatic composite filament having good operability, excellent thread stability and high mesh weaving stability without scum generation and good antistatic properties.

[Prior art]

In recent years, the demand for precise weaving density has become more and more strict in gauze fabrics for use in industrial materials such as printing and filtration filters, and in the direction of weaving filaments with fineness and high breaking strength into high mesh. It is proceeding. Silk fabrics and stainless steels have long been used as materials for industrial materials, but in recent years mesh fabrics made of synthetic fibers have become widely used due to their flexibility and excellent cost performance. Have been. Among them, polyester monofilament is excellent in water resistance and dimensional stability, and is preferably used for high mesh gauze fabric.

However, many synthetic fibers, including polyester fibers, are more hydrophobic than natural fibers.
There is a disadvantage that static electricity is easily generated due to high electric resistance. In particular, in high mesh weaving, the frequency of contact and the frictional force between the running filament and the reed blade having a small pitch arrangement increase, so that the gauze fabric used tends to be charged with static electricity. If static electricity is charged to the gauze in the weaving process, not only is the worker given discomfort such as electric shock and pain due to the static electricity, but also in terms of safety, the static electricity may lead to an accident such as dust explosion, which is not preferable. Further, when the gauze is charged, dust is likely to adhere to the gauze, and printing defects may occur in screen gauze applications such as printing and printed circuit boards. Therefore, many antistatic agents have long been studied in order to impart antistatic performance to synthetic fibers.

[0004] The properties required of an antistatic agent include not only antistatic performance, but also good polymerization operability, good affinity with a sheath component, good spinnability, and spinning. And having heat resistance that can withstand the conditions.
Among them, hydrophilic polyalkylene oxide represented by polyethylene glycol and its derivatives, modified products and mixtures are the most important. Although many kinds of polyalkylene oxide-based antistatic agents are commercially available, their low melt viscosity and poor spinnability make them often unsuitable for continuous linear mixing such as core-sheath composite filaments. Therefore, when this antistatic agent is used, it has to be mixed with a polymer having good spinnability and spun, thereby causing a problem that the antistatic performance is reduced.

[0005] Numerous improvement techniques have been proposed for the purpose of providing the filament with antistatic properties. For example, JP-A-4-153372, JP-A-7-189
No. 121 and the like have proposed many methods of coating a polyester fiber surface with an antistatic agent composed of a polymer, a metal oxide, or the like. However, since the antistatic agent having low friction resistance is exposed on the surface layer, when weaving the high mesh gauze fabric, the antistatic agent is easily cut by the reed teeth, and scum is generated. Also, Japanese Patent Application Laid-Open No. 6-158534 and the like have proposed many methods of imparting antistatic performance to polyester fibers by post-processing. However, in the washing process after weaving the gauze, there are many problems such as not only the antistatic agent coming off and the performance being deteriorated, but also the drainage water flowing out causing environmental pollution. Further, JP-A-2-289119 discloses a core-sheath type composite monofilament in which the core component has a molecular weight of 800-2.
Antistatic composite monofilaments containing 0.1 to 2.5% by weight of polyalkylene ether per 000 monofilament have been proposed. However, since the antistatic agent is mixed and dispersed in the core component, the antistatic performance cannot be sufficiently exhibited, and when trying to obtain sufficient antistatic performance for high mesh weaving, a large amount of the antistatic agent is required. Is required.

[0006] As the fineness of the raw fiber is increased by making the gauze fabric into a high mesh, the breaking strength of the yarn decreases, and the yarn breakage during weaving increases. If the breaking strength is low, it is not possible to attach the gauze with sufficient tension during the gauging, so that a gauze fabric having good weaving properties cannot be obtained.

Generally, the breaking elongation of the filament for high mesh gauze fabric is preferably 20 to 30% in terms of quality. However, if high strength is to be obtained, the yarn must be drawn at a higher draw ratio in order to make the film highly oriented in the drawing step, resulting in a low elongation yarn. As a result, the filament becomes a rigid filament, and the surface of the filament is scraped off by the reed during weaving, so that a whisker-like or powder-like scum is easily generated. The resulting scum causes soiling of the loom and impairs workability. At the same time, if a part of the scum is woven into the gauze fabric, printing defects occur during precision printing.

[0008] Therefore, a number of improved techniques have been proposed to obtain high strength while maintaining proper elongation. For example, in JP-A-5-25709,
A three-layer composite monofilament for a printing screen gauze having a breaking strength of 5.5 g / d (4.9 cN / dT) or more, which is a three-layer composite monofilament containing an antistatic compound in the middle layer, has been proposed. This makes it possible to obtain a high-strength monofilament. However, if a thin-layer three-layer composite monofilament is used, the production process becomes complicated, disadvantageous in terms of cost performance and production stability. Are mixed, so that sufficient antistatic performance cannot be obtained.

[0009]

DISCLOSURE OF THE INVENTION The present invention relates to a high-mesh gauze fabric which has good antistatic performance with a small amount of antistatic agent without post-processing, has no scum, and has good weavability. It is an object of the present invention to provide a composite filament.

[0010]

The object of the present invention is to provide a fiber-forming polymer comprising a sheath component, a polyalkylene glycol having an average molecular weight of 6000 or more (component A) and an organic dicarboxylic acid or its ester (component B). Wherein the content of the component A is 70 to 95% by weight and the average molecular weight is 10,000.
A resin composition obtained by further mixing a metal salt of an organic sulfonic acid in an amount of 10 to 30% by weight with respect to the polymer is used as a core component, and the core component is 0.3 to the sheath component. -5% by weight of the core-sheath composite filament, wherein the core component of the composite filament is not exposed to the surface layer.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the present invention will be described in detail.
High mesh screen suitable for precision printing (250-4
(00 mesh), a fine filament having a fineness of 10 to 44 dT is used, and a polyester monofilament is particularly preferably used. The requirements for this filament for high mesh gauze fabric are that it has a high breaking strength that can withstand gauze with high tension, and that it is mustache or powdery due to the reed teeth of the loom during weaving. Scum is not generated, and good weavability is maintained.

The antistatic property means that static electricity generated by friction or the like on the surface of the gauze is quickly leaked, and the charged voltage is maintained within a range that does not hinder practical use. Synthetic fibers are hydrophobic and have high electrical resistance, and the contact frequency and frictional force between the running filament and the reeds increase during weaving of high-mesh gauze fabrics. In addition, the weaving property is significantly reduced. The feature of the present invention is that, in a small amount of the antistatic compound in the core component, and in a form that is not exposed to the filament surface layer, while maintaining the scum suppressing ability, a high breaking strength capable of maintaining good antistatic performance. The purpose is to obtain a filament for high mesh gauze fabric.

The antistatic polymer constituting the antistatic composite filament of the present invention is a resin composition containing polyalkylene glycol as a main component (hereinafter referred to as ASA). That is, a polyalkylene glycol (A component) having an average molecular weight of 6000 or more and an organic dicarboxylic acid or an ester thereof (B component) are converted into a polymer having an A component content of 70 to 95% by weight and an average molecular weight of 10,000 to 70,000. And a resin composition obtained by mixing an organic sulfonic acid metal salt in an amount of 10 to 30% by weight based on the weight of the copolymer. ASA has high antistatic performance even in a small amount, is easy to polymerize and spin, and is excellent in cost performance, so that it is highly practical.

The polymer constituting ASA has an average molecular weight of 1
It is necessary to have a high molecular weight of 0000 to 70000, and since the spinning property is excellent in this range, the antistatic agent is spun as a continuous streak in the fiber axis direction without interruption in the middle. be able to. If it is less than 10,000, the core-sheath structure cannot be formed because the melt viscosity decreases. On the other hand, if it exceeds 70,000, it tends to gel during melt spinning, making spinning extrusion difficult, which is not preferable.

The polyalkylene glycol (component A) used for ASA includes polyethylene glycol, polypropylene glycol, polybutylene glycol, and their random polyethers and block polyethers, and is not particularly limited. Among them, polyethylene glycol and their random or block polyethers are particularly preferably used in view of polymer stability.

The average molecular weight of the polyalkylene glycol must be 6,000 or more, and particularly preferably 8,000 or more. When it is 6000 or more, the processability for obtaining a high-molecular-weight ASA is improved, which is advantageous not only in the cost performance of the production but also in the spinning stability and the high antistatic effect. 6
If the molecular weight is less than 000, not only the antistatic performance becomes poor, but also the melt viscosity of the obtained ASA decreases, and the practicability decreases, which is not preferable.

The polymerization ratio of the polyalkylene glycol is required to be 70 to 95% by weight, particularly preferably 91 to 95% by weight. Within this range, it is possible to maintain the optimum antistatic performance, and furthermore, the flow start temperature at the time of melting is low, and the polymerization and spinning process can be handled in a relatively low temperature range, so that there is an advantage that deterioration is small. When the content is less than 70% by weight, the antistatic performance cannot be sufficiently exhibited, and further, since the degree of denaturation is low, the handling is in a high temperature range, so that the deterioration tends to occur. If the content exceeds 95% by weight, the degree of modification is too high, so that the thermal stability is deteriorated and the spinning stability is undesirably reduced.

Organic dicarboxylic acids (B) used for ASA
Ingredients) include terephthalic acid, aromatic dicarboxylic acids such as isophthalic acid, and their methyl esters, ethyl esters, propyl esters, ethylene glycol esters, or low molecular weight polyethylene terephthalate, polyethylene isophthalate, polypropylene terephthalate, polypropylene isophthalate, And copolymers and mixtures thereof, and are not particularly limited. Among them, aromatic dicarboxylic acids and esters thereof are particularly preferably used in view of cost performance and polymerization stability.

The types of the organic sulfonic acid metal salts used in ASA include sodium, potassium and lithium salts of alkyl sulfonic acids having 3 to 40 carbon atoms, such as toluenesulfonic acid, dodecylbenzenesulfonic acid (hereinafter referred to as D).
A sodium salt, a potassium salt, a lithium salt, and the like of BS) are preferably used. The mixing ratio of the organic sulfonic acid metal salt is 10 to 30% by weight based on the entire polymer.
Is necessary, and particularly preferable is 20 to 30% by weight. Within this range, higher antistatic performance can be exhibited with stable operability. If the mixing amount is less than 10%, sufficient antistatic performance cannot be obtained. On the other hand, if it exceeds 30%, the physical properties of the fiber are reduced, and furthermore, the life of the filter (capturing time) for trapping foreign matter during melt spinning is shortened, and the spinning property is also reduced due to the decrease in the fluidity of the polymer. Not preferred.

The type of the fiber-forming polymer used in the sheath component of the present invention includes polyethylene, polypropylene, polyester, polyamide, acryl, polyurethane resin, etc., and is not particularly limited as long as it is a polymer capable of core-sheath composite spinning. Can be used without. Among them, polyester is particularly preferably used because it has a good affinity for ASA. Examples of the type of polyester include aromatic polyesters such as polyethylene terephthalate (PET), polybutylene terephthalate (PBT), and polyethylene naphthalate (PEN);
Examples include aliphatic polyesters such as polyethylene succinate and polycaprolactone. Among them, PET is particularly preferably used from the viewpoints of operability and cost performance when performing melt spinning. The molecular weight, molecular weight distribution, and intrinsic viscosity of the fiber-forming polymer are not particularly limited as long as the core-sheath composite spinning is possible.

In addition, known antioxidants, light stabilizers, various metal compound catalysts used in polymer polymerization, and various inert particles such as titanium oxide, may be used for the core component ASA and the sheath component fiber-forming polymer. You may mix | blend silicon oxide, calcium carbonate, etc.

The amount of the core component is 0.3 to 5 with respect to the sheath component.
% By weight, and most preferably 1 to 3% by weight. When the content is in the range of 0.3 to 5% by weight, a monofilament having good antistatic performance can be obtained while maintaining high breaking strength. If the content is less than 0.3% by weight, sufficient antistatic performance cannot be exhibited. If the content exceeds 5% by weight, the antistatic performance is increased, but the breaking strength is reduced, and the fabric cannot be stretched with sufficient tension.

The cross-sectional shape of the composite monofilament is not particularly limited, but is preferably circular. The number of the core components is not particularly limited, and the cross-sectional shape of the core includes a radial type, a multi-core type, a sea-island type, and the like, and is not limited. It is necessary not to be exposed. Since the core component is included in the sheath component without being exposed on the filament surface, the sheath component plays a role of protecting the surface against scum generation,
ASA having low friction resistance can be woven without being cut by a reed of a loom.

The minimum thickness of the sheath layer is preferably 1 to 20 μm. When the content is within this range, static electricity is easily released because the distance from the core to the filament surface layer is small while the amount of the antistatic agent used is kept small.

The appropriate elongation at break of the obtained filament is as follows:
20 to 30% is preferable in view of process passability and quality of the gauze fabric, and particularly preferably 22 to 25%. Within this range, the filament is bent and sheared while maintaining a high breaking strength, so that it is possible to obtain a gauze fabric having good gauging properties. The appropriate breaking strength at this time is 5.0 cN.
/ DT or more is preferable. When it is not less than 5.0 cN / dT, it can be stuck to the gauze frame with a sufficient tension, so that yarn breakage can be reduced and a gauze fabric having good weaving properties can be obtained.

[0026]

The present invention will be described in more detail with reference to the following examples. In the examples, polyester monofilaments suitable for high-mesh gauze fabrics for industrial materials such as screen printing and filtration filters were used. In addition, the evaluation in an Example followed the following method.

A. Friction band voltage measurement (evaluation of antistatic performance): Friction band voltage was measured by drawing a drawn yarn into a tubular knit or a woven fabric, and following the JIS-L-1094 method, EST-7 type friction band manufactured by Kanebo Engineering Co., Ltd. Friction band voltage was measured using a voltage measuring device. The friction cloth was made of wool, the measurement room temperature was 20 ° C., and the humidity was 40%. The evaluation was excellent when the charged voltage after friction for 60 seconds was 500 V or less (◎), 100
A value of 0 V or less was rated as good (○), and a value of more than 1000 V was rated as poor (x).

B. Elongation at break: The sample elongates at a sample yarn length of 20 cm and a constant speed pulling speed of 20 cm / min using an AGS-1KNG autograph tensile tester manufactured by Shimadzu Corporation according to JIS-L-1013. The strength and elongation at break were determined.

C. Evaluation of weaving property (evaluation of yarn breakage): A 350 mesh high-mesh screen woven fabric was woven at 300 rpm by a sluser type loom, and weaving property was evaluated from warp or weft breakage. For the evaluation of yarn breakage, those having a weaving length of 500 m or more were evaluated as good (（), and those having a weaving length of less than 500 m were evaluated as poor (x).

D. Scum evaluation: Weaving was carried out in the same manner as in "C. Evaluation of weaving properties", and evaluation was made based on the weaving length when the stand had to be stopped due to dirt on the reed due to generation of scum. Those with a weaving length of 500 m or more were rated good (○), and those with a weaving length of less than 500 m were rated poor (x).

E. Operability evaluation Operability evaluation was determined from the stability of polymer extrusion during melt spinning, yarn breakage during spinning, and fineness unevenness. When the operability was stable and good, the result was good (（), and when the workability was bad, the result was bad (x).

F. Measurement of average molecular weight A polymer sample was dissolved in chloroform solvent at about 50 mg / l.
, And filtered through a 0.45 μm membrane filter to prepare a sample. Water sample
The weight average molecular weight was measured using an LC Module 1plus manufactured by s Corporation as a column temperature of 35 ° C. and chloroform as an eluent.

G. Measurement of cross-sectional shape and minimum thickness of sheath layer The obtained drawn filament was cut in a direction perpendicular to the fiber axis, and the cross-sectional shape was confirmed with a microscope. A photomicrograph was taken at a minimum thickness of 400 times of the sheath layer, and the length of the portion closest to the surface from the core was measured.

H. PET polymerization step The PET used this time was in accordance with the conventionally known DMT method. That is, using DMT and ethylene glycol, 0.09 (% by weight / ester) of calcium acetate monohydrate and 0.03 (% by weight / ester) of manganese acetate tetrahydrate were added as transesterification catalysts. The transesterification reaction was performed. After the completion of the reaction, the polycondensation reaction is carried out by adding 0.04 (% by weight / polymer) of antimony trioxide as a polymerization catalyst and 0.043 (% by weight) of trimethyl phosphate as a heat stabilizer. This was performed under high vacuum conditions to obtain a PET chip. The intrinsic viscosity [η] of the obtained chip was 0.65, and the melting point was 263 ° C.

I. ASA Polymerization Step The polymerization of ASA as an antistatic agent is carried out by preparing a predetermined amount of bis-hydroxyethyl terephthalate, which is an aromatic dicarboxylic acid ester, a predetermined amount of polyethylene glycol (hereinafter referred to as PEG), and antimony trioxide as a polymerization catalyst. 0.04
(Weight% / ester), trimethyl phosphate 0.043 (weight% / ester) as a stabilizer, and Irganox 1010 (manufactured by Ciba Geigy) which is a hindered phenol-based stabilizer to prevent polymer deterioration during polymerization. 1
(% By weight / ester), and the raw materials were stirred, mixed, and dehydrated at 230 ° C. for about 2 hours under a nitrogen stream. At the same time, a predetermined amount of a sodium salt of DBS was mixed. Next, while gradually raising the temperature to 245 ° C., the degree of vacuum was reached to 130 Pa in about 1 hour, and polymerization was further performed at 27 to 67 Pa.
After completion of the polymerization reaction, the vacuum was returned to normal pressure by injecting nitrogen, and then 2% of Irganox 1010 was further added to prevent oxidation of the polymer, followed by stirring and mixing for 10 minutes to obtain ASA.

J. Monofilament spinning The spinning is performed using PET described in (H.) as a sheath component and ASA obtained by the polymerization method described in (I.) as a core component. A conventionally known composite spinning method as described in JP-A-104912 and the like was used. That is, the core-sheath component is passed through separate filtration parts, flows into the base, is associated immediately before the discharge hole, and is discharged and formed as a filament, whereby a structure composed of the core and the sheath can be obtained. At this time,
Spinning temperature 295 ° C, ASA injection temperature 200 ° C, spinning speed 15
The test was performed at 00 m / min. About one day after winding, the roller was heated at a speed of 800 m / min.
Drawing was performed by passing through a 50 ° C. plate heater to obtain an antistatic composite monofilament.

<Operability due to difference in PEG average molecular weight,
Evaluation of antistatic performance> According to the ASA polymerization method described in (I.),
(% By weight / ester) copolymerization, average molecular weight of 4000 (20% by weight / polymer) mixed with sodium salt of DBS
An ASA of 0 was obtained. At that time, as shown in Table 1, PE
The average molecular weight of G was varied. Using this ASA, the amount of the core is set to 2 (% by weight) with respect to the sheath component.
According to the spinning method described in (J.), a 6-leaf core-sheath composite monofilament of 33 dT was obtained. When the obtained monofilament was cut in the fiber axis direction and observed with a microscope, the core component was in a continuous streak-like form. Table 1 shows the operability and antistatic performance evaluation of this monofilament.

[0038]

[Table 1]

Comparative Example 1 had poor antistatic performance because the average molecular weight of PEG was too low. On the other hand, Examples 1, 2, and 3 according to the present invention exhibited good polymerization, spinning operability, and antistatic performance. In particular, the average molecular weight of PEG is 8000
Above, the antistatic performance was excellent.

<Operability and antistatic performance test depending on difference in average molecular weight of PEG / PET copolymer> According to the polymerization method described in (I.), an average molecular weight of 80 was obtained.
PEG with an average molecular weight of 00 to 91 (wt% / ester)
As shown in Table 2, when producing an ASA mixed with 20% (% by weight / polymer) of sodium salt of DBS by copolymerization,
The average molecular weight of the EG / PET copolymer was varied.
The ASA thus polymerized was used to adjust the blending amount of the core to 2 (% by weight) with respect to the sheath component, thereby obtaining a 33-dT six-leaf core-sheath composite monofilament according to the spinning method described in (J.). The obtained monofilament was cut in the fiber axis direction and observed under a microscope. Table 2 shows the operability and antistatic performance test of this monofilament.

[0041]

[Table 2]

Comparative Example 2 shows that the average molecular weight of the PEG / PET copolymer is too small,
Melt viscosity was low, the difference in viscosity from PET was large, and spinning was difficult. In addition, the core component could not be arranged in a continuous streak form due to poor spinnability, and the antistatic performance was poor. In Comparative Example 3, since the polymer was in the ultra-high molecular weight region, gelation was likely to occur during melt spinning, resulting in poor operability, and deterioration was liable, resulting in poor antistatic performance. On the other hand, Examples 2, 4, and 5 according to the present invention
Since the average molecular weight of the EG / PET copolymer is optimal,
The spinnability was good, the core component could be easily arranged in a continuous streak form, and a monofilament without heat deterioration and having good antistatic performance could be obtained.

<Evaluation of weaving properties and antistatic performance according to differences in ASA raw material composition> According to the polymerization method described in (I), PEG having an average molecular weight of 8000 was used, and as shown in Table 3, blending of PEG and sodium salt of DBS The amount was varied and the average molecular weight was 40
000 ASA were obtained. Using these ASA, the core was blended in an amount of 2 (% by weight) with respect to the sheath component and stretched according to the spinning method described in (J.) so that the elongation at break was 24 ± 1%. To obtain a 6-leaf core-sheath composite monofilament. The obtained monofilament was cut in the fiber axis direction and observed with a microscope, and it was confirmed that the core component was not exposed on the surface in a continuous streak form. Table 3 shows the operability, weavability, and antistatic performance evaluation results of this monofilament.

[0044]

[Table 3]

In Comparative Example 4, the antistatic performance was low due to the small amount of PEG added, and the spinning operability was poor due to uneven viscosity. Comparative Example 5 has good antistatic performance,
Due to the low strength, the screen could not be swelled with sufficient tension during screen weaving, and the weavability was poor due to yarn breakage. Further, since the PEG copolymerization amount was too large, the thermal stability was deteriorated, and the spinning operability was lowered. Comparative Examples 6 and 7
Sufficient antistatic performance could not be obtained because the mixing amount of the sodium salt of BS was too small. In Comparative Example 8, the antistatic performance was excellent, but the closing time of the filter was short during spinning, and the yarn quality was not stable, so that the yarn was low-strength, and the spinning operability and weavability were poor. On the other hand, Examples 2, 6, 7, 8, 9, and 10 according to the present invention
Since both the copolymerization amount and the DBS sodium salt mixture amount are optimal, ASA having good polymerization operability could be obtained. Furthermore, since ASA can be spun in a low temperature range, a high-strength elongation monofilament with less heat deterioration and good spinning operability and good antistatic performance could be obtained.

<Evaluation of weaving property and antistatic performance by difference in core-sheath ratio> According to the polymerization method described in (I), the average molecular weight was 80%.
PEG of 91 (wt% / ester) copolymer, DB
ASA having an average molecular weight of 40,000 mixed with 20 (wt% / polymer) of sodium salt of S was polymerized. This A
Using SA, the core-sheath ratio was variously changed as shown in Table 4, and stretched so that the breaking elongation was 24 ± 1% according to the spinning method described in (J.). A core-sheath composite monofilament of the shape was obtained. The obtained monofilament was cut in the fiber axis direction and observed with a microscope, and it was confirmed that the core component was not exposed on the surface in a continuous streak form. Table 4 shows the weaving property and antistatic performance evaluation of this monofilament.

[0047]

[Table 4]

In Comparative Example 9, the antistatic performance was insufficient because the amount of the antistatic agent was too small. In Comparative Example 10, the antistatic performance was excellent because the amount of the antistatic agent added was large, but because the strength was insufficient, the fabric could not be swelled with sufficient tension, yarn breakage occurred frequently, and the weavability was poor. On the other hand, in Examples 2 and 1 according to the present invention,
Samples Nos. 1, 12, and 13 had good weaving properties and good antistatic performance because they could be stretched with sufficient tension.

<Evaluation of Antistatic Performance by Difference in Cross Section Shape> According to the polymerization method described in (I.), the average molecular weight was 80%.
PEG of 91 (wt% / ester) copolymer, DB
Asa having an average molecular weight of 40,000 was obtained by mixing 20 (wt% / polymer) of sodium salt of S. This ASA
With the core blending amount of 2 (% by weight), the cross-sectional shape is as shown in FIGS.
Various spinning according to the spinning method described in (J.), 33
A dT monofilament was obtained. The obtained monofilament was cut in the fiber axis direction and observed with a microscope, and it was confirmed that the core component was not exposed on the surface in a continuous streak form. . The ASA-dispersed monofilament was mixed with an ASA mixed amount of 2 (% by weight) and PET described in (H.) using a twin-screw kneader.
Was spun as a single yarn using a chip kneaded at a mixing amount of 98 (% by weight) to obtain an antistatic monofilament having a cross-sectional shape shown in FIG. 4 under the same conditions as the spinning method described in (J.). When the obtained monofilament was cut in the fiber axis direction and observed under a microscope, it was found that the core component (antistatic component) had a discontinuous streak shape. Table 5 shows the scum evaluation and antistatic performance evaluation of this monofilament.

[0050]

[Table 5]

In Comparative Example 11, since the antistatic agent of the core was exposed on the surface layer, the antistatic property was excellent, but the antistatic agent was cut off by a reed during weaving, and a large amount of scum was generated. . In Comparative Example 12, since the antistatic agent of the core was not arranged in a continuous streak form, it was difficult for static electricity to escape out of the system, and the antistatic performance was poor.
Further, a large amount of scum was generated, and the weavability was poor. On the other hand, in both Examples 2 and 14 of the present invention, the core component was not exposed to the surface layer, so that both the scum evaluation and the antistatic performance evaluation were good.

<Evaluation of scum and antistatic performance by change in minimum thickness of sheath layer> According to the polymerization method described in (I.), an average molecular weight of 80 was obtained.
PEG of 91 (wt% / ester) copolymer, DB
Asa having an average molecular weight of 40,000 was obtained by mixing 20 (wt% / polymer) of sodium salt of S. This ASA
With the core blending amount of 2 (% by weight), the minimum thickness from the core layer to the filament surface layer was variously changed as shown in Table 6 to obtain a 6-leaf core-sheath composite monofilament of 33 dT as shown in FIG. . In the spinning method described in (J.), the thickness of the sheath layer was changed by moving the position of the association hole of the core immediately before the discharge hole to change the thickness, thereby changing the thickness. Table 6 shows the scum evaluation and antistatic performance evaluation results of this monofilament.
Shown in

[0053]

[Table 6]

In Examples 17 and 18, since the distance from the core component to the filament surface layer was large, the evaluation of the antistatic performance was good. In Examples 2, 15, and 16, the minimum thickness of the sheath layer was in the more optimal range, and thus the antistatic performance was excellent.

[0055]

The ASA according to the present invention is excellent in polymer stability and spinnability, and exhibits high antistatic performance even in a small amount, so that an antistatic agent excellent in cost performance could be supplied. Further, by providing a core-sheath structure in which the antistatic agent is not exposed to the surface layer of the filament, it is possible to supply an antistatic composite filament having good weaving properties without scum during high mesh weaving.

[Brief description of the drawings]

FIG. 1 is a cross-sectional shape of a conjugate fiber of the present invention.

FIG. 2 is a cross-sectional shape of the conjugate fiber of the present invention.

FIG. 3 is a cross-sectional shape of a conjugate fiber outside the scope of the present invention.

FIG. 4 is a cross-sectional shape of a conjugate fiber outside the scope of the present invention.

[Explanation of symbols]

 1 Fiber forming layer (sheath component) 2 Antistatic layer (core component)

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Hideo Ueda 4-1 Kanebo-cho, Hofu City, Yamaguchi Prefecture Inside Kanebo Goden Co., Ltd. (72) Inventor Shigeki Honda 4-1 Kanebo-cho, Hofu City, Yamaguchi Prefecture Kanebo God Incorporated F term (reference) 4L041 BA02 BA05 BA23 BA24 BA46 BC08 BC20 BD06 BD14 CA16 DD21 EE01 4L048 AA21 AA23 AA28 AA48 AA49 AA52 AB10 AC09 AC10 AC13 BA06 CA09 DA37 DA39 DA40

Claims (3)

[Claims] 1. A fiber-forming polymer comprising a sheath component, a polyalkylene glycol having an average molecular weight of 6000 or more (component A) and an organic dicarboxylic acid or an ester thereof (component B), wherein the content of component A is 70 to 95. A resin composition in which a metal salt of an organic sulfonic acid is mixed with a polymer having an average molecular weight of 10,000 to 70,000 by weight to be 10 to 30% by weight with respect to the polymer is used as a core component, and the core component is used as a sheath component. An antistatic composite filament comprising 0.3 to 5% by weight of a core-sheath composite filament, wherein a core component of the composite filament is not exposed to a surface layer. 2. The fiber according to claim 1, wherein the sheath has a minimum thickness of 1-2.
The antistatic composite filament according to claim 1, which has a thickness of 0 µm. 3. The antistatic composite monofilament according to claim 1, wherein the fiber has a breaking elongation of 20 to 30% and a breaking strength of 5.0 cN / dT (centinewton / decitex) or more.