JP2000212835A - Antistatic aliphatic polyester conjugate fiber - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain an antistatic aliphatic polyester conjugate fiber having excellent clear colorability and excellent antistaticity and especially suitable for soft clothing uses by forming a conjugate fiber which comprises a sheath portion comprising a specific aliphatic polyester and a core portion comprising a blend of the aliphatic polyester with a water-insoluble polyalkylene ether copolymer. SOLUTION: This antistatic aliphatic polyester conjugate fiber comprises a sheath portion comprising an aliphatic polyester having a melting point of >=130 deg.C and a refractive index of <=1.50, such as an easily degradable polyester consisting mainly of L-lactic acid, and a core portion comprising the aliphatic polyester and a water-insoluble polyalkylene ether copolymer composition, such as a blocked polyetheramide composition. The sheath portion and the core portion are preferably disposed in a concentric circular shape, and the core portion is contained in an amount of 5-50 wt.%. The polyalkylene ether portion in the blocked polyetheramide composition is preferably contained in an amount of 0.05-5 wt.% based on the total amount of the fiber. The antistatic aliphatic polyester conjugate fiber preferably has a strength of >=4 g/d and a boiling water shrinkage factor of <=20%.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an aliphatic polyester fiber having an excellent antistatic property and excellent color development. More specifically, the present invention relates to an aliphatic polyester conjugate fiber having a high degree of antistatic properties and excellent in vivid coloration, wherein a water-insoluble polyalkylene ether copolymer composition is slightly localized in the fiber. The present invention relates to an antistatic aliphatic polyester composite fiber particularly suitable for use in clothing.

[0002]

2. Description of the Related Art Aromatic polyester fibers represented by polyethylene terephthalate have been applied to various fields because of their excellent physical and chemical properties. However, since such polyester fibers are inherently hydrophobic, they are remarkably charged at low humidity, and are actually limited in some applications when developed for clothing.

[0003] Incidentally, these aromatic polyesters containing terephthalic acid as a main carboxylic acid component have extremely high durability in a natural environment and do not easily decompose in the natural environment. There is a drawback that they will remain. In addition, polyethylene terephthalate has a relatively high refractive index, so that it does not generally provide clear color development and has a disadvantage that the quality of dyed and woven fabrics is low.

Conventionally, in order to solve these problems, various biodegradable materials have been proposed. And
For biodegradable fibers having antistatic properties, surfactants,
Japanese Patent Application Laid-Open No. 9-157954 proposes an antistatic composite aliphatic polyester fiber in which an antistatic agent selected from a polyalkylene ether and a polyalkylene ether derivative is blended in a core. However, the antistatic agent used here is mainly composed of a compound that is soluble in hot water, and the passage of high-order processing involving hot water treatment such as a scouring step or a dyeing step is mentioned. Absent.

[0005] Since textiles for clothing are usually dyed and used, they are not restricted to high-order processing such as the refining and dyeing steps, and even to repeated washing. There is a demand for a material with a small reduction in the electrical effect.

[0006]

SUMMARY OF THE INVENTION An object of the present invention is to provide a clear color-forming property and an excellent anti-static property which have not been obtained in the prior art, without lowering the anti-static property by dyeing and repeated washing.
An object of the present invention is to create a soft aliphatic polyester composite fiber and a fiber product particularly suitable for use in clothing.

Another object of the present invention is to provide an antistatic aliphatic polyester conjugate fiber and a fiber product which are easily degradable in a natural environment.

[0008]

An object of the present invention is to provide a sheath made of an aliphatic polyester having a melting point of 130 ° C. or more and a refractive index of 1.50 or less, and a water-insoluble polyalkylene ether copolymer composition. The problem can be solved by an antistatic aliphatic polyester composite fiber comprising a core of a mixture mixed with an aliphatic polyester. Further, in this case, the water-insoluble polyalkylene ether copolymer composition is a block polyether amide composition, and the ratio of the polyalkylene ether portion of the block polyether amide composition to the entire composite fiber is 0.
It is preferably from 05 to 5% by weight. With respect to the core-sheath composite form, it is preferably employed that the core part and the sheath part are arranged substantially concentrically and that the ratio of the core part is 5 to 50% by weight. The composite fiber preferably has a strength of 4 g / d or more and a boiling water shrinkage of 20% or less. It is also preferred that the aliphatic polyester is a readily decomposable polyester containing L-lactic acid as a main component.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The aliphatic polyester used as a sheath component in the present invention must have a melting point of 130 ° C. or higher. When the melting point is lower than 130 ° C, the quality of the product is extremely low, such as poor stretchability due to the fusion between the single yarns and melting defects during dyeing, heat setting and friction heating. Therefore, it cannot be used for clothing. The melting point of the aliphatic polyester used in the present invention is preferably 150 ° C. or higher, more preferably 170 ° C. or higher. However, a polymer having a melting point of more than 300 ° C. is not preferable because it is considered that thermal decomposition may occur sharply during melting. Here, the melting point is DS
C means the peak temperature of the melting peak obtained by the measurement.

The aliphatic polyester used as the sheath component in the present invention must have a refractive index of 1.50 or less. Preferably, the refractive index is 1.45 or less. If the refractive index is more than 1.50, the fabric after dyeing has poor color developability and only a dull color is obtained, which is not preferable. The lower the refractive index, the better, and the lower limit is 1.00.

The refractive index referred to here is measured in accordance with JIS-K7 by an Abbe refractometer equipped with a prism, which is installed in a room capable of collecting natural light and is adjusted to 23 ° C. by means of circulation of constant temperature water.
It means a value measured according to the method described in 105.

The aliphatic polyester used as the sheath component in the present invention is not particularly limited as long as the melting point is 130 ° C. or more and the refractive index is 1.50 or less, for example, polylactic acid, polyglycolic acid, and polylactic acid. Polyoxyacids such as -3-hydroxypropionate, poly-3-hydroxybutyrate, poly-3-hydroxybutyrate valerate,
And blends and modifications thereof.

In the present invention, by using such an aliphatic polyester, unlike the aromatic polyester fiber, a good soft feeling is exhibited. This good soft feeling is due to the fact that the Young's modulus of the aliphatic polyester fiber is clearly lower than the Young's modulus of the aromatic polyester fiber. Further, these aliphatic polyesters have an advantage that they are easily decomposed in a natural environment because of their high biodegradability or hydrolyzability.

Preferred aliphatic polyesters from the viewpoint of high melting point and high heat resistance include polylactic acid which is a polyester mainly composed of L-lactic acid and polyglycolic acid which is a polyester mainly composed of glycolic acid. Can be. L-lactic acid as the main component means that the component 6
It means that 0% by weight or more is composed of L-lactic acid, and a polyester containing D-lactic acid in a range not exceeding 40% by weight may be used.

[0015] Polylactic acid is produced by a two-stage lactide method in which lactide is used as a raw material to produce lactide, which is a cyclic dimer, and then ring-opening polymerization is carried out. Is known as a one-step direct polymerization method. The polylactic acid used in the present invention may be obtained by any production method. In the case of polylactic acid obtained by the lactide method, the cyclic dimer contained in the polymer is vaporized at the time of melt spinning and causes thread spots. It is desirable that the content of the monomer be 0.1 wt% or less. Further, in the case of the direct polymerization method, since there is substantially no problem caused by the cyclic dimer, it can be said that it is more preferable from the viewpoint of the spinning property.

The higher the average molecular weight of the polylactic acid, the better, usually at least 50,000, preferably at least 100,000.
More preferably, it is 100,000 to 300,000. If the average molecular weight is lower than 50,000, the strength physical properties of the fiber tend to decrease, which is not preferable.

The polylactic acid in the present invention is preferably a homopolymer, but is a copolymerized polylactic acid obtained by copolymerizing other components having an ester-forming ability in addition to L-lactic acid and D-lactic acid. Is also good. Examples of copolymerizable components include glycolic acid, 3-hydroxybutyric acid, 4-hydroxybutyric acid, 4-hydroxyvaleric acid, hydroxycarboxylic acids such as 6-hydroxycaproic acid, ethylene glycol, propylene glycol, butanediol, Pentyl glycol, polyethylene glycol, glycerin, compounds containing a plurality of hydroxyl groups in the molecule such as pentaerythritol or derivatives thereof, adipic acid,
Sebacic acid, fumaric acid, terephthalic acid, isophthalic acid,
Compounds containing a plurality of carboxylic acid groups in the molecule, such as 2,6-naphthalenedicarboxylic acid, 5-sodium sulfoisophthalic acid, and 5-tetrabutylphosphonium isophthalic acid, and derivatives thereof are exemplified. However, from the viewpoint of maintaining the mechanical properties of the fiber, the copolymerization ratio of the copolymer component is desirably 20% by weight or less, and more desirably 10% by weight or less.

In order to reduce the melt viscosity, an aliphatic polyester such as polycaprolactone, polybutylene succinate and polyethylene succinate can be used as an internal plasticizer or as an external plasticizer. Further, inorganic fine particles and organic compounds as a matting agent, a deodorant, a flame retardant, a yarn friction reducing agent, an antioxidant, a coloring pigment and the like can be added as required.

The polymer mixture used as a core component in the present invention is a mixture obtained by mixing a water-insoluble polyalkylene ether copolymer composition with an aliphatic polyester. Polyalkylene ethers such as polyethylene ether and polypropylene ether have good antistatic performance, but are soluble in water, so they can be used in processing processes that are indispensable for clothing fibers such as scouring and dyeing processes, or when used repeatedly. The antistatic performance tends to decrease by washing. Therefore, the polyalkylene ether copolymer composition of the present invention must be insoluble in water. Here, "insoluble in water" means that when treated in a large excess of boiling water for 60 minutes, 50% of its weight
The above means what remains. Conversely, being soluble in water means that when treated in a large excess of boiling water for 60 minutes, the residual ratio of its weight is
Less than 50%.

Examples of such a water-insoluble polyalkylene ether copolymer include block polyether amide. The block polyetheramide is a block copolymer of a polyether and a polyamide, and a mere blend of the polyether and the polyamide is not included in the block polyetheramide referred to in the present invention.

The polyether constituting the block polyether amide is a polyalkylene ether,
It is a polymerization product of ethylene oxide such as polyethylene ether, polypropylene ether and polyethylene propylene ether. The molecular weight of these polyethers is preferably 1000 or more, more preferably 3000 to 8000, and among them, the use of polyethylene glycol is most suitable.

On the other hand, the polyamide constituting the block polyether amide is nylon 4, nylon 6, nylon
A homopolyamide such as 8, nylon 12, nylon 6, 6, nylon 6, or 10 or a homo- or copolyamide formed by a polycondensation reaction of a polyamide-forming component with each other or a copolymer containing other copolymer components. It is.

As a method for producing the block polyether amide, for example, the amount of the polyalkylene glycol is cyanoethylated, and then hydrogenated to obtain a polyalkylene ether diamine, which is then reacted with an appropriate dicarboxylic acid such as adipic acid or sebacic acid. A method of reacting to synthesize a nylon salt, polycondensing the salt and a monomer forming the polyamide, and aminating both ends of the polyalkylene glycol to obtain a polyalkylene ether diamine, followed by the same method as described above. Examples include a method of polycondensation, and the weight ratio of the polyether component to the polyamide component in these block polyetheramides is 50 to 50 to 70.
Pair 30 is appropriate.

The method of polycondensation of the block polyether amide is not particularly limited either, and it is usually a polycondensation method of a known polyamide, for example, a normal pressure polymerization method often used for nylon 6 or the like, or nylon 6,6 or the like. Pressure polymerization method or the like can be employed regardless of a batch type or a continuous type.

The block polyether amide composition used in the present invention may contain a predetermined amount of an organic electrolyte and a phenolic antioxidant in addition to the block polyether amide.

As used herein, the organic electrolyte includes sulfonic acids such as dodecylbenzenesulfonic acid, tridecylbenzenesulfonic acid, nonylbenzenesulfonic acid, hexadecylsulfonic acid and dodecylsulfonic acid, and alkali metal salts such as sodium, potassium and lithium. And alkali metal salts of phosphoric acid such as sodium distearate, and other alkali metal salts of organic carboxylic acids. Of these, metal salts of sulfonic acids (organic metal salts) such as sodium dodecylbenzenesulfonate are preferred.

As the phenolic antioxidants, for example, 1,3,5 trimethyl-2,4,6-tri (3,5-di-tert-
Butyl-4-hydroxybenzyl) benzene, 2,2′-methylenebis (4-methyl-tert-butylphenol),
2,6-di-tert-butylphenol), 2,6-di-tert-
It is a phenol derivative having a substituent having steric hindrance at a position adjacent to a phenolic hydroxyl group such as butyl-P-cresol and 2,2′-methylenebis (4-ethyl-6-tert-butylphenol).

The ratio of the organic electrolyte in the block polyetheramide composition is preferably 1 to 10% by weight. More preferably, it is in the range of 3 to 7% by weight. When the amount is less than 1% by weight, the effect of improving the antistatic property is insufficient, and when the amount exceeds 10% by weight, the antistatic property tends to be lowered due to the deterioration of the line forming ability due to the decrease in the melt viscosity of the block polyetheramide composition.

The ratio of the phenolic antioxidant in the block polyetheramide composition is preferably 1 to 10% by weight. More preferably, it is 3 to 7% by weight. If the content is less than 1% by weight, the yarn forming process, yarn processing process such as false twisting, dyeing of fabric,
In some cases, it may be difficult to sufficiently suppress the deterioration of antistatic properties due to oxidative deterioration in the finishing process, etc., and even if added in excess of 10% by weight, the effect of suppressing thermal oxidation is saturated, and No effect is observed and it is not economical.

In addition to the organic electrolyte and the phenolic antioxidant, a matting agent, a coloring inhibitor, a fluorescent agent, a weathering agent,
Additives such as pigments can be added without any problem.

As the aliphatic polyester used as the core component in the present invention, the same aliphatic polyester as that used for the sheath component can be used, but the melting point that cannot be used for the sheath component is less than 130 ° C. It may be an aliphatic polyester. However, it is desirable that the sheath component and the core component are composed of the same aliphatic polyester from the viewpoint of preventing the interface between the core and the sheath.

In the present invention, as a method of compound spinning the mixture obtained by mixing the block polyetheramide composition with the aliphatic polyester and the aliphatic polyester in a core-sheath shape, it is possible to employ a known composite prevention technology. it can. The composite ratio of core / sheath can be arbitrarily selected,
In order to suppress the quality deterioration due to fibrillation, the core ratio is
It is preferably from 5 to 50% by weight, more preferably from 5 to 20%. Further, the cross section of the fiber may be a circle, an irregular cross section, or a mixture of a circle and an irregular cross section. Regarding the core-sheath composite shape, it is preferable to be substantially concentric. In the case of an eccentric core-sheath, fibrillation characteristics may be deteriorated due to a short distance between the fiber surface layer and the core.

The amount of the water-insoluble polyalkylene ether copolymer composition of the present invention to be added is such that the ratio of the polyalkylene ether portion in the composition to the entire conjugate fiber is determined.
It can be appropriately determined so as to be 0.05 to 5% by weight. If the proportion of the polyalkylene ether component in the entire composite fiber is less than 0.05% by weight, sufficient antistatic properties cannot be imparted. If it exceeds 5% by weight, the effect of improving the antistatic properties is saturated, and further improvement is achieved. Not only cannot be expected, but also the yarn properties may be degraded due to an increase in the added amount. It is particularly preferable that the ratio of the polyalkylene ether component to the entire conjugate fiber is 0.1 to 1% by weight.

The antistatic aliphatic polyester conjugate fiber of the present invention preferably has a fiber strength of 4 g / d or more and a boiling water shrinkage of 20% or less. When the fiber strength is 4 g / d or less, it is not preferable because it causes a yarn breakage stop during weaving or a decrease in product strength due to a decrease in tear strength of a woven or knitted fabric. The strength of the antistatic aliphatic polyester composite fiber of the present invention is more preferably 4.5 g / d or more,
Most preferably, it is 5 g / d or more.

Further, the boiling water shrinkage of the antistatic aliphatic polyester composite fiber of the present invention is preferably 20% or less. If the boiling water shrinkage is more than 20%, shrinkage in the case of performing a hot water treatment such as refining or dyeing becomes large, making it difficult to stretch the fabric and tending to harden the texture.

[0036]

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. Relative Viscosity of Block Polyetheramide Composition A sample was dissolved in 70% chloral hydrate to a 1% concentration and measured at 25 ° C. with an Ostwald viscometer.

B. Intrinsic Viscosity (η) of Aliphatic Polyester 0.1100 g of a sample was dissolved in 10 ml of orthochlorophenol and measured at 25 ° C. using an Ostwald viscometer.

C. Electric resistivity The sample is washed in a weak alkaline aqueous solution of 0.2% anionic surfactant using an electric washing machine for 2 hours, then washed with water and dried. Next, the sample was drawn up into a fiber bundle having a length (L) of 5 cm and a fineness of 1000 denier, and humidified at 20 ° C. and 40% RH for 2 days. The resistance of the sample was measured by using the following formula.

Ρ = (R × D) / (9 × 10 ⁵ × L × d) ρ: Volume resistivity (Ω · cm) R: Resistance (Ω) d: Sample density (g / cm ³ ) D: Fineness (Denier) L: sample length D. Friction Band Voltage Using a dyed fabric as a sample, a Kyoto University Chemical Research-type rotary static tester (manufactured by Koa Shokai Co., Ltd.) used a plain weave Kanakin No. 3 (100 g / cm ³ net weight) of cotton that had been previously cut, refined and bleached as a cloth to be rubbed. ) Is measured in an atmosphere with a rotor rotation speed of 400 rpm, an applied voltage of 100 V, a temperature of 20 ° C., and a relative humidity of 30%.

E. Strength Orientec tensile tester (Tensilon UCT-100
), A tensile test was performed under the conditions of a sample length of 20 cm and a tensile speed of 20 cm / min, and the stress at the breaking point was taken as the fiber strength.

F. Boiling water shrinkage rate (boiling yield) The sample was wound into 10 turns and the original length (L ₀ ) was measured under a load of 0.1 g / d. The skein of the sample was treated in a boiling water bath adjusted to 100 ° C. for 15 minutes, taken out, air-dried, and the length (L ₁ ) after the treatment was measured under a load of 0.1 g / d. The value obtained by the following equation was defined as boiling water shrinkage (boiling yield).

Sw = {(L ₀ −L ₁ ) / L ₀ } × 100 (%) Sw: boiling yield (%) L ₀ : original length (mm) L ₁ : length after treatment (mm)

G. Fibrillability Using a fibrillation tester shown in Fig. 1, a wet sample (dyed woven or knitted fabric) 1 is attached to a head 3 using a holder 4 so that a friction area with a friction ² is 12.5 cm ^2. Then, a load 5 is placed thereon so that the sum of the loads becomes 750 g. On the other hand, the friction table 6 is attached via a non-slip sandpaper 7, eccentrically rotated at 85 rpm, and subjected to friction for 15 minutes. Then, the sample 1 is removed, and the degree of fibrillation is visually determined. That is, if the portion rubbed by fibrillation looks white, it is regarded as poor fibrillation resistance (x),
When the rubbed part was indistinguishable from the other parts, the fibril resistance was evaluated as good (良好).

Example 1 Acrylonitrile was reacted with polyethylene glycol in the presence of an alkali catalyst, and a hydrogenation reaction was carried out to synthesize polyethylene glycol diamine (number average molecular weight: 4000) in which 97% or more of both terminals were amino groups. And
This was subjected to a salt reaction with adipic acid by a conventional method to obtain a 45% aqueous solution of polyethylene glycol diammonium adipate. Polyethylene glycol diammonium isophthalate aqueous solution concentrate can above 45% of the capacity 2m ³ 20
0 kg, 120 kg of 85% aqueous solution of caprolactam and 16 kg of 40% aqueous solution of hexamethylene diammonium isophthalate are added, and heated at normal pressure for about 2 hours until the internal temperature reaches 110 ° C.
Concentrated to a% concentration. Next, the concentrated solution was transferred to a polymerization vessel having a capacity of 800 l, and the reaction was continued while flowing nitrogen at 2.5 (l / min) into the polymerization vessel. When the internal temperature reached 120 ° C, 5.2 kg of sodium dodecylbenzenesulfonate (DBS) was added to 1,5,
5.2 kg of 5-trimethyl-2,4,6-tri (3,5-di-tert-butyl-4-hydroxybenzyl) benzene (TTB) is added, and stirring is started until the internal temperature reaches 245 ° C. The mixture was heated for 18 hours to complete the polymerization. After the completion of the polymerization, a pressure of 7 kgf / cm ² was applied to the inside of the can with nitrogen, and the molten polymer was extruded into a belt having a width of 15 cm and a thickness of 1.5 mm on a rotating endless belt. The relative viscosity of the obtained chip was 2.18.

Using a known composite spinning machine, a chip made of the block polyetheramide composition having a relative viscosity of 2.18 and produced by the above method was used as a poly-L-lactic acid chip having a melting point of 172 ° C. and a refractive index of 1.45. A mixed chip obtained by mixing 3.50% by weight with an L-body ratio of 95% by weight is supplied from one hopper for a core component, and the other hopper has a melting point of 172 ° C. and a refractive index of 172 ° C.
1.45 poly L-lactic acid chips (L-form ratio 95% by weight) were supplied for the sheath component. At a spinning temperature of 260 ° C, a concentric conjugate fiber with a core-to-sheath conjugate ratio of 80:20 (weight ratio) has a spinning speed of 1200
Withdrawn at m / min. The obtained undrawn yarn is drawn at a drawing temperature of 80.
℃, heat setting temperature 120 ℃, stretch at 3.0 times draw ratio, 75D
A −36f drawn yarn was obtained.

[0047] Both spinnability and drawability can be satisfactorily formed, and the obtained drawn yarn has a strength of 4.2 (g / d) and a boiling water shrinkage of 8.3 (%), which are desirable physical properties for clothing fibers. I was In addition, the electrical resistivity is as good as 14 × 10 ⁸ (Ω · cm), and the fabric obtained by weaving and dyeing this yarn in taffeta fabric has a frictional voltage of 440 (V), which shows good antistatic properties even after dyeing. It was found to have. The fibril resistance was also good. Table 1 shows the results.

Examples 2 to 4 Various ratios of the chips made of the block polyetheramide composition used in Example 1 to the polylactic acid chips having a melting point of 172 ° C. and a refractive index of 1.45 are shown in Table 1. Example 1 was repeated except that the mixed pellets changed and mixed were used as the core component.
In the same manner as described above, a 75D-36f drawn yarn was obtained.

The yarn-forming properties, the strength of the obtained yarn, the boiling water shrinkage, the electrical resistivity, and the friction vs. voltage and fibril resistance of the fabric obtained by weaving and dyeing these yarns in taffeta fabric are as shown in Table 1. It was found that good antistatic properties and fiber properties were exhibited. Table 1 shows the results.

[0050]

[Table 1] Comparative Example 1 A polyethylene glycol having a molecular weight of 6000, which is soluble in hot water, was used instead of the block polyetheramide, and the melting point was 17
Poly L-lactic acid chip with a refractive index of 1.45 at 2 ° C (L-form ratio 95
% By weight), and a 75D-36f drawn yarn was obtained in the same manner as in Example 1, except that a mixed chip obtained by mixing 2.5% by weight of the mixture was used as a core component.

As shown in Table 2, the specific resistance of the fiber was 12 × 10
^{It was 8} (Ωcm) and had sufficient antistatic performance. However, when a taffeta fabric was woven using this fiber and the frictional electrostatic potential of the dyed fabric was measured, it was 2750 (V). In this case, the antistatic property after dyeing was significantly reduced and lost.

Comparative Example 2 The melting point was 260 ° C. and the refractive index was 1.56 in place of the polylactic acid as the sheath component.
Using the same polyethylene terephthalate (PET) as in Example 1, except that the melter temperature was 280 ° C. and the spinning temperature was 290 ° C., a drawn yarn of 75D-36f was obtained.

The obtained fiber had a strength of 5.2 (g / d) and a boiling point of 7.0.
(%), Excellent electrical properties, and good electrical resistivity and frictional voltage, but the dyed fabric had poor color developability and had a dull tint. Table 2 shows the results
Shown in

Comparative Example 3 Polycaprolactone (PCL) having a melting point of 60 ° C. was used in place of polylactic acid as a sheath component, and a melter temperature was 180 ° C. and a spinning temperature was 200.
A drawn yarn of 75D-36f was obtained in the same manner as in Example 1 except that the temperature was changed to ° C.

Since the boiling point of the fiber was as high as 54 (%), the fabric shrunk vigorously during dyeing, and the fabric shape was not maintained, so that the fabric was not suitable for extremely coarse and hard clothing. Table 2 shows the results.

[0056]

[Table 2]

[0057]

According to the present invention, an antistatic aliphatic polyester composite fiber having excellent coloring properties without lowering of antistatic performance even by higher-order processing such as dyeing or repeated washing can be obtained. In addition, in the present invention, by using the aliphatic polyester, a good soft feeling can be obtained unlike the fiber made of the aromatic polyester.

Also, by using polylactic acid or the like as the aliphatic polyester, it can be easily decomposed in a natural environment.

[Brief description of the drawings]

FIG. 1 is a schematic diagram of a tester for evaluating fibrillation.

[Explanation of symbols]

 1: Sample 2: Friction cloth 3: Friction head 4: Holder 5: Load 6: Friction table 7: Sandpaper

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 4L035 AA09 BB32 BB89 BB91 EE01 EE08 EE13 EE20 FF10 HH10 4L041 AA07 AA20 AA25 BA02 BA05 BA21 BC04 BC05 BC08 BC18 BC20 BD14 BD20 CA05 CB15 CB17 CB28 DD01 DD08 DD18

Claims (5)

[Claims] 1. A sheath made of an aliphatic polyester having a melting point of 130 ° C. or more and a refractive index of 1.50 or less, and a core of a mixture obtained by mixing a water-insoluble polyalkylene ether copolymer composition with an aliphatic polyester. An antistatic aliphatic polyester composite fiber, comprising: 2. The water-insoluble polyalkylene ether copolymer composition is a block polyether amide composition, and the ratio of the polyalkylene ether portion in the block polyether amide composition to the entire conjugate fiber is 0.05 to 2. 2. The antistatic aliphatic polyester conjugate fiber according to claim 1, wherein the amount is 5% by weight. 3. The antistatic fat according to claim 1, wherein the core and the sheath are arranged substantially concentrically, and the ratio of the core is 5 to 50% by weight. Polyester fiber. 4. The composite fiber according to claim 1, wherein the strength of the composite fiber is 4 g / d or more, and the boiling water shrinkage is 20% or less.
3. The antistatic aliphatic polyester composite fiber according to any one of 3. 5. The antistatic aliphatic polyester composite fiber according to claim 1, wherein the aliphatic polyester is an easily degradable polyester containing L-lactic acid as a main component.