JP2011084827A - Core-sheath type conjugate fiber - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a core-sheath type conjugate fiber having high heat-keeping properties and excellent dyeability, and enabling post processing. <P>SOLUTION: The core-sheath type conjugate fiber is composed of a sheath component (component A) of a polyester selected from among a polyalkylene terephthalate, a polyalkylene naphthalate and a copolymer thereof, and a core component constituted of a blend polymer of a polyester (component B) selected from among a polyalkylene terephthalate, a polyalkylene naphthalate and a copolymer thereof, and a polyarylene sulfide (component C), wherein the weight ratios of the components A, B and C satisfy the relations of general formula (1), 0.01≤(B/C)≤0.2, and general formula (2), 0.05≤(B+C)/A≤1. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a core-sheath type composite fiber having high heat retention and excellent dyeability.

  Polyester fibers are widely used for general clothing because of their excellent properties such as mechanical properties, chemical properties, easy care properties, and glossiness. There is a need for consumer diversification and individualized sensibilities, and various performances such as higher quality and more warmth are required. However, the polyester fibers have a plastic feeling and have the disadvantages of insufficient warmth and heat retention as winter clothing.

  Therefore, in order to improve the drawbacks of the polyester fiber as described above, hollowing the fiber is widely performed. Hollow fibers have been known for a long time (Patent Document 1). However, in the case of hollow fibers, it is generally carried out by spinning from a hollow spinning nozzle, but the surface tension of a resin in a molten state is not until solidified even if the fiber is given a hollow structure. The ratio of the hollow portion tends to decrease due to the take-up tension during spinning and the like, and it is difficult to obtain hollow fibers having a high hollow ratio. Moreover, even if a fiber with a high hollow ratio is obtained, there is a drawback that the hollow portion is easily crushed in the post-processing step. In particular, the tendency is higher as the hollow fiber has a higher hollow ratio.

  In order to solve the problems in the post-processing process, hollow fibers having a triangular hollow at the center of the fiber cross section are disclosed, but although the crush resistance tends to improve, the hollow fibers are completely as long as they have hollow portions. (Patent Document 2).

  In order to solve the problems in the post-processing process, polyamide is used as the sheath component, and the fabric composed of the core-sheath composite fiber using polyester as the core component is treated with an alkaline aqueous solution to dissolve and remove part of the polyester as the core component. And the manufacturing method of the fabric which provides a hollow part between a core component and a sheath component is proposed (patent documents 3-5). However, since the hollow fiber proposed in the publication contains polyester as a core component, it is not necessarily a fiber having high heat retention. Moreover, even if the hollow ratio after post-processing is large in the above hollow fiber, there is a problem that the hollow ratio is lowered by use, and the heat retention changes with the elapsed time of use.

  On the other hand, it is known to increase heat retention by using a fiber using a resin having low thermal conductivity such as polyphenylene sulfide (PPS). However, PPS has low dyeability and cannot be used in applications that require dyeing, such as clothing. For industrial materials, PPS and other resins made of composite fibers, or fibers in which liquid crystal polyester or the like is blended with PPS have been proposed (Patent Documents 6 and 7). These have low dyeability because PPS is present on the surface.

  Thus, the present condition is that the fiber which can be dye | stained and maintains heat retention after post-processing is not obtained.

Japanese Patent Publication No.42-2928 JP-A-6-228815 Japanese Patent Laid-Open No. 3-124857 Japanese Patent Laid-Open No. 3-124878 JP 7-278947 A JP 2007-51327 A JP 7-243128 A

  An object of the present invention is to provide a core-sheath type composite fiber having high heat retention and excellent dyeability.

  The above-described problem is a polyester in which the sheath component (component A) is selected from polyalkylene terephthalate, polyalkylene naphthalate and copolymer thereof, and the core component is polyalkylene terephthalate, polyalkylene naphthalate and copolymer thereof. It is composed of a blend polymer of polyester (component B) and polyarylene sulfide (component C) selected from polymers, and the weight ratio of component A, component B and component C satisfies the following general formulas (1) and (2) This can be solved by the core-sheath type composite fiber.

0.01 ≦ (B / C) ≦ 0.2 (1)
0.05 ≦ (B + C) / A ≦ 1 (2)

  ADVANTAGE OF THE INVENTION According to this invention, it can provide as a fiber structure with high heat retention by the use used as a heat retention fiber raw material, specifically, a clothing use, a non-clothing use, an industrial use etc., for example.

  The present invention will be described in detail below.

  The sheath component (component A) of the core-sheath composite fiber of the present invention is a polyester selected from polyalkylene terephthalate, polyalkylene naphthalate, and copolymers thereof.

  Examples of the polyalkylene terephthalate include a polymer obtained using a diol component and a terephthalic acid component. Examples of the diol component include ethylene glycol, 1,4 butanediol, propylene glycol, trimethylene glycol, tetramethylene glycol, hexamethylene glycol, neopentyl glycol, diethylene glycol, polyethylene glycol, cyclohexanedimethanol, 2,2-bis (2 ′ -Hydroxyethoxyphenyl) propane and the like and derivatives thereof having ester forming ability. 1,4-butanediol and its ester-forming derivatives, trimethylene glycol and its ester-forming derivatives, ethylene glycol or its ester-forming derivatives and terephthalic acid or its ester-forming derivatives When polybutylene terephthalate (PBT), polytrimethylene terephthalate (PTT) and polyethylene terephthalate (PET) obtained by condensation are used, they are preferably used because they are vividly dyed.

  Polyalkylene naphthalate includes a polymer obtained using a diol component and a naphthalenedicarboxylic acid component. Examples of the diol component include ethylene glycol, 1,4 butanediol, propylene glycol, trimethylene glycol, tetramethylene glycol, hexamethylene glycol, neopentyl glycol, diethylene glycol, polyethylene glycol, cyclohexanedimethanol, 2,2-bis (2 ′ -Hydroxyethoxyphenyl) propane and the like and derivatives thereof having ester forming ability. 1,4 butanediol and its ester-forming derivatives, trimethylene glycol and its ester-forming derivatives, ethylene glycol or its ester-forming derivatives and naphthalene dicarboxylic acid or its ester-forming derivatives Polybutylene naphthalate, polytrimethylene naphthalate and polyethylene naphthalate obtained by polycondensation are preferably used. Among these, PET is more preferable because it is excellent in thermal stability and is a relatively inexpensive polymer.

  The component A of the present invention is preferably copolymerized with a polyoxyalkylene glycol. By copolymerizing polyoxyalkylene glycol, the dyeability of the disperse dye is improved, and it becomes possible to mix with fibers that need to be dyed at normal pressure, such as natural fibers.

  The polyoxyalkylene glycol preferably has a molecular weight of 90 to 6000. If the polyoxyalkylene glycol has a molecular weight of 90 or more, the dyeability and color developability of the fiber are further improved, and since the molecular weight is sufficient, the higher-order processability of the fiber is also improved. On the other hand, if the molecular weight is 6000 or less, it is uniformly copolymerized in the modified polyester, so that the dyeability and color developability of the resulting fiber can be satisfied. The molecular weight of the polyoxyalkylene glycol is more preferably 100 to 4000, and still more preferably 100 to 1200.

Examples of the polyoxyalkylene glycol include polyoxyalkylene glycol represented by the following formula.
A (C _n H _2n O) _m H
(In the formula, A represents C _e H _{2e + 1} O or OH, e represents 1 to 10, n represents 2 to 5, and m represents an integer of 2 to 65.)
The content of polyoxyalkylene glycol is preferably 0.1 to 5.0% by weight. It is preferable that the amount of polyoxyalkylene glycol is in this range because the dyeability and color developability of the fibers are further improved. More preferably, it is 0.5 to 2.0% by weight.

  Component A of the present invention is preferably copolymerized with an isophthalic acid component containing a metal sulfonate group. The isophthalic acid containing a metal sulfonate group is a compound represented by the following formula, specifically, dimethyl (5-sodium sulfo) isophthalate, bis-2-hydroxyethyl (5-sodium sulfo) isophthalate, bis -4-hydroxybutyl (5-sodium sulfo) isophthalate, dimethyl (5-lithium sulfo) isophthalate, and the like.

(In the formula, M represents an alkali metal such as Na, Li, K, A, A ′ represents hydrogen, an alkyl group, or — (CH ₂ ) _n OH, and n represents an integer of 2 or more)
Preferred isophthalic acids containing metal sulfonate groups are dimethyl (5-sodium sulfo) isophthalate and bis-2-hydroxyethyl (5-sodium sulfo) isophthalate.

  The isophthalic acid having a metal sulfonate group is preferably copolymerized in an amount of 0.7 to 2.4 mol% based on the modified polyester acid component. When the copolymerization amount is 0.7 mol% or more, the dyeing and coloring properties of the fiber with a basic dye are good, and when it is 2.4 mol% or less, the melt viscosity does not increase remarkably. When spinning, proper filtration is possible, and undrawn yarn having good yarn characteristics can be obtained, and the yarn strength is sufficient.

In addition, the sheath component (component A) of the core-sheath composite fiber of the present invention includes hindered phenol-based, amine-based, phosphite-based, thioester-based antioxidants, benzotriazole-based, benzophenone-based, cyanoacrylate-based Particles such as organic pigments such as ultraviolet absorbers, infrared absorbers, cyanine, stilbene, phthalocyanine, anthraquinone, perinone, quinacridone, inorganic pigments, fluorescent brighteners, calcium carbonate, silica, titanium oxide, etc. In addition, additives such as antibacterial agents and electrostatic agents may be contained.

  The core component of the core-sheath type composite fiber of the present invention is composed of a blend polymer of polyester (component B) and polyarylene sulfide (component C) selected from polyalkylene terephthalate, polyalkylene naphthalate and copolymers thereof. . By setting it as such a blend polymer, peeling | exfoliation with a sheath component is suppressed, it becomes difficult to whiten and it can dye | stain clearly. Further, the strength is improved.

  Component B of the present invention is a polyester selected from polyalkylene terephthalate, polyalkylene naphthalate and copolymers thereof. Examples of the polyalkylene terephthalate include a polymer obtained using a diol component and a terephthalic acid component. Examples of the diol component include ethylene glycol, 1,4-butanediol, propylene glycol, trimethylene glycol, tetramethylene glycol, hexamethylene glycol, neopentyl glycol, diethylene glycol, polyethylene glycol, cyclohexanedimethanol, 2,2-bis (2 '-Hydroxyethoxyphenyl) propane and the like and derivatives thereof having an ester-forming ability.

The polyalkylene naphthalate includes a polymer obtained by using a diol component and a naphthalenedicarboxylic acid component. Examples of the diol component include ethylene glycol, 1,4-butanediol, propylene glycol, trimethylene glycol, tetramethylene glycol, hexamethylene glycol, neopentyl glycol, diethylene glycol, polyethylene glycol, cyclohexanedimethanol, 2,2-bis (2 '-Hydroxyethoxyphenyl) propane and the like and derivatives thereof having an ester-forming ability.

  Among these, since PET is excellent in thermal stability, it has a great effect of suppressing peeling, and tends to suppress whitening and improve dyeability. PET can be more preferably used because it is a relatively inexpensive polymer.

  The components A and B of the present invention are preferably the same polymer composition because the adhesion between the core component and the sheath component of the core-sheath composite fiber is good.

  In the present invention, component C of the sheath component is polyarylene sulfide (PAS). The PAS resin in the present invention is a homopolymer or copolymer having a repeating unit of the formula-(Ar-S)-as a main structural unit. Examples of Ar include units represented by the following formulas (A) to (K), among which the units represented by formula (A) are particularly preferable.

(In the formula, R1 and R2 are substituents selected from hydrogen, alkyl groups, alkoxy groups and halogen groups, and R1 and R2 may be the same or different.) As long as it is a structural unit, it can contain a small amount of branching units or crosslinking units represented by the following formulas (L) to (N). The copolymerization amount of these branch units or cross-linking units is preferably in the range of 0 to 5 mol%, more preferably in the range of 1 mol% or less, relative to the-(Ar-S) -unit.

  Further, the PAS resin in the present invention may be a random copolymer, a block copolymer and a mixture thereof containing the following repeating units.

  Representative examples of these PAS resins include polyphenylene sulfide (PPS), polyphenylene sulfide sulfone, polyphenylene sulfide ketone, random copolymers, block copolymers, and mixtures thereof. Particularly preferred PAS resins include p-phenylene units as the main structural unit of the polymer.

Are PPS, polyphenylene sulfide sulfone and polyphenylene sulfide ketone, and PPS is particularly preferable.

In the core component of the core-sheath type composite fiber of the present invention, the weight ratio of component B and component C is represented by the following general formula (1).
0.01 ≦ (B / C) ≦ 0.2 (1)
When the weight ratio B / C between component B and component C is less than 0.01, the adhesion between the sheath component of the core-sheath composite fiber is reduced, the core component and the sheath component are peeled off, and the fiber is whitened or dyed. Decrease. Also, the spinnability is deteriorated, and the physical properties of the obtained fiber are lowered, particularly the strength and elongation are lowered. On the other hand, if B / C exceeds 0.2, the heat retaining property decreases. By making it the range of this invention, the fiber physical property and heat retention of a composite fiber can be made compatible. The weight ratio of Component B to Component C is preferably 0.1 or less, and preferably 0.05 or less. The core component of the present invention is preferably made into a fiber after blending in a spinning machine or by melt-kneading and mixing components B and C in advance.

The method of melt kneading of the present invention is not particularly limited, and a known heat-melt mixing device can be used. A single-screw extruder, a twin-screw extruder, a combination twin-screw extruder, a kneader / ruder, or the like can be used as the heat-melt mixing device. Among these, a twin screw extruder is preferably used because dispersibility of PPS and polyalkylene terephthalate is improved. More preferably, a twin screw extruder having two or more kneading zones is used.

The core-sheath composite fiber of the present invention is characterized in that the core-sheath ratio is represented by the following general formula (2).
0.05 ≦ (B + C) / A ≦ 1 (2)
If (B + C) / A is less than 0.05 in the above general formula, sufficient heat retention cannot be obtained. By setting (B + C) / A to be 0.05 or more, it is possible to obtain a conjugate fiber with good heat retention. This is because PPS exhibits a heat insulating effect because the thermal conductivity of PPS is low, and by setting the above ratio, the thermal conductivity of the entire fiber is lowered and the heat retaining property is improved. On the other hand, if (B + C) / A is greater than 1, the fiber is colored yellow and the dyeability is lowered. Preferably it is 0.5 or less.

  The composite fiber of the present invention can be usefully used in any form of filament or staple. For example, as a filament for clothing, a multifilament having a single yarn fineness in the range of 0.1 dtex to several tens dtex and a total fineness of 50 to 300 dtex and 10 to 100 filaments is preferably used. Further, for example, as a filament for industrial use, a single filament fineness is in the range of several tens of Dtex to several hundred Dtex, and a multifilament in which the total fineness is in the range of several hundred Dtex to several thousand Dtex and the number of filaments is in the range of 10 to 100. Preferably used.

  The fiber cross-sectional shape of the polyester core-sheath composite fiber of the present invention can be modified to have an irregular cross section such as flat, triangular, multi-leaf cross section, etc. within a range not impairing the object of the present invention. It is possible to impart physical functionality such as change in texture and capillary phenomenon by making the modified cross section, and it is also possible to obtain an improvement effect of functionality when a functional agent is applied to the hollow part of these modified cross sections is there. The irregular cross section defined here is not limited to the form of the fiber surface formed by the sheath component, but also includes the boundary surface between the core component and the sheath component, and may be provided with unevenness.

  The fiber structure can be used in various fabric forms such as woven fabric, knitted fabric, and non-woven fabric. For example, in the case of apparel use, the filaments described above may be woven into a woven fabric such as a triple tissue or a change tissue that is a single tissue, a horizontal double tissue or a vertical tissue that is a double tissue. Also, filaments for industrial use can be used by weaving into a woven fabric in the same manner as for clothing.

  Moreover, since the conjugate fiber of the present invention is not affected by post-processing, various post-processing can be performed. For example, functions such as water repellency, hydrophilicity, antistatic properties, deodorizing properties, antibacterial properties, and deep color properties are imparted by processing in the bath, exhaustion processing, coating processing, pad-dry processing, pad-steam processing, etc. be able to. In addition, since the composite fiber of the present invention does not have a decrease in heat retention due to external force, it can improve texture characteristics such as swell while maintaining heat retention by false twisting or twisting.

  The composite fiber of the present invention can be blended or mixed with other fibers as long as there is no decrease in heat retention, etc., but is preferably contained as a main component in the fiber structure. It is more preferable to contain 70% or more by weight with respect to the structure.

The specific manufacturing method of the composite fiber of this invention is shown below.
First, the polyester used for the core component A and the core component B is selected.
Next, the core component polyester and PAS resin are melt-kneaded by the above-described method, and PAS
/ Made polyester blend resin.

  The sheath component polyester and the core component PAS / polyester blend resin are separately melted and weighed at 280 to 320 ° C., led to a spinning block heated to 280 to 320 ° C., and put into a spinning pack incorporated in the spinning block. After feeding, filtering the polymer in the pack, and then laminating the core-sheath structure with a spinneret, the discharged yarn is obtained. The spun yarn is once cooled and solidified, and then an oil agent is applied by an oiling guide, and then an appropriate entanglement is applied by an entanglement device, and then taken up and wound by a godet roll at a speed of 800 to 4000 m / min. Furthermore, a core-sheath type composite fiber can be obtained by stretching at a stretching temperature of 80 to 100 ° C. and heat setting at 120 to 150 ° C.

  The fiber structure using the core-sheath conjugate fiber of the present invention can be suitably used as a fiber product that particularly requires heat retention, such as a clothing material. Among these, heat retention is necessary, and it is suitably used in applications where a dyeing process, a post-processing process, a false twisting process, and the like are essential.

The present invention will be specifically described below with reference to examples.
In addition, the evaluation method of each physical property was measured by the method shown below, respectively.

(1) Measurement of core-sheath ratio of composite fiber An ultrathin section in the cross-sectional direction of the composite fiber was prepared using an ultramicrotome (MT6000 type) manufactured by Sorvall. This section was observed at 3000 times using a transmission electron microscope (Hitachi H800 type). The field of view was changed and photographs of 5 fields of view were taken. The core part and the sheath part of each photograph were cut out, the ratio of the core-sheath was calculated by the weight method, and the average value of the 5 fields of view was taken as the core-sheath ratio.

(2) Spinnability and stretchability Using a known compound spinning machine, spinning for 24 hours under the conditions of a spinning temperature of 300 ° C., a spinning speed of 1500 m / min, a nozzle diameter of 0.23 mm-24H (hole), and a discharge rate of 40 g / min. The yarns that were not broken were judged as ◯, those in which single yarn breakage occurred during spinning as Δ, and those that could not be spun as x.

Further, under the conditions of a processing speed of 400 m / min, a stretching temperature of 90 ° C., and a set temperature of 150 ° C., stretching is performed at a draw ratio such that the fineness of the obtained drawn yarn becomes 85 dtex-24 filaments,
The case where no yarn breakage occurred was judged as ◯, the case where a single yarn was wound around a roller or fluff was judged as Δ, and the case where the yarn could not be drawn was judged as ×.

(3) Sensory evaluation was carried out by 10 panelists using two samples of the thermal insulation test sample (woven fabric) and the standard sample (polyester yarn) fabric having the same yarn diameter as the test sample, and evaluated according to the following criteria. , ◎ and ○ were accepted.
Thermal insulation: Whether the thermal insulation of the two fabrics was clearly felt when holding the fabric of the standard sample and the test sample.
Evaluation criteria for heat retention ◎: Nine or more people judged to have a significant difference ○: Seven to eight people judged to have a significant difference △: Five to six people judged to have a significant difference ×: Four or less people had a significant difference Judgment (4) Dyeability The obtained sample was placed on a metal plate, dyed according to a conventional method, and color development was judged.
Evaluation of dyeability ◎: Dyeing is uniform and there is no difference in shading ○: Shading is rare, but within practical range △: Some shading is present, and uniform dyeing No ×: Conspicuous spots are remarkable. The raw materials used in the examples were as shown below.

[PET]
A polyethylene terephthalate pellet having an intrinsic viscosity of 0.65 obtained by a known method was dried at 150 ° C. for 10 hours under vacuum.

[CoPET1]
A pellet of copolymerized polyethylene terephthalate 1 (CoPET1) having an intrinsic viscosity of 0.65 made of polyethylene terephthalate copolymerized with 3 mol% of dimethyl 5-sodium sulfoisophthalate obtained by a known method was dried at 130 ° C. under vacuum. What was dried for 15 hours was used.

[CoPET2]
Copolymerized polyethylene terephthalate 2 (CoPET2) having an intrinsic viscosity of 0.70 made of polyethylene terephthalate copolymerized with 3 mol% of dimethyl 5-sodium sulfoisophthalate and 1% by weight of polyethylene glycol having a molecular weight of 4000 obtained by a known method. ) Was dried at 130 ° C. for 15 hours under vacuum.

[PEN]
A pellet of 2,6-polyethylene naphthalate (PEN) having an intrinsic viscosity of 0.70 obtained by a known method was dried at a drying temperature of 150 ° C. under vacuum for 10 hours.

[PPS]
PFR pellets obtained by a known method with MFR of 298 g / 10 min were dried at a drying temperature of 15
What was dried at 0 ° C. under vacuum for 10 hours was used.

Example 1
97% by weight of PPS chip and 3% by weight of PET chip were supplied to a bent type twin-screw kneader / extruder having two kneading zones heated to 300 ° C., with a shear rate of 100 sec ⁻¹ and a residence time of 1 minute. Melt extruded. The resin temperature during kneading was 300 ° C. From the kneader, it was discharged in the form of strands in cold water and immediately cut to obtain polymer chips of 97 wt% PPS and 3 wt% PET.

  Next, composite spinning was performed using PET as the sheath component and the PPS / PET composition obtained by kneading as the core component. Each polymer was previously dried in a vacuum dryer at 150 ° C. for 10 hours at 2 Torr and then melted separately. Using a known composite spinning machine, a predetermined core-sheath ratio of 33/67, spinning temperature of 300 ° C., Spinning was performed under the conditions of a spinning speed of 1500 m / min, a nozzle diameter of 0.23 mm-24H (hole), and a discharge rate of 40 g / min to obtain an undrawn yarn.

  Next, the drawn yarn was drawn at a draw ratio such that the fineness of the drawn yarn obtained was 85 dtex-24 filaments under the conditions of a processing speed of 400 m / min, a drawing temperature of 90 ° C., and a set temperature of 150 ° C.

The obtained drawn yarn was wound on a metal plate, and dyed with Diax Black BG-FS (manufactured by Mitsubishi Kasei Co., Ltd., disperse dye) 15% owf aqueous dispersion at a bath ratio of 1:30 at 130 ° C. for 60 minutes. As a result, it was uniformly dyed and there was no difference between light and shade. Furthermore, as a result of producing a plain weave fabric using drawn yarn and evaluating the heat retention, it was found that there was a significant difference. These results are summarized in Table 1.
Examples 2, 3 and Comparative Example 1
This was carried out in the same manner as in Example 1 except that the ratio of the PET / PPS core component was changed. The results are summarized in Table 1. If the ratio of PET / PPS exceeds 0.2 as in Comparative Example 1, heat retention cannot be obtained.

Comparative Example 2
This was carried out in the same manner as in Example 1 except that the core component was PPS alone. However, at a spinning temperature of 300 ° C., the fluidity of PPS was poor and spinning could not be performed, so the temperature was changed to 320 ° C. The results are summarized in Table 1. When the core component was only PPS, whitening was observed after dyeing. This is due to peeling between the core component and the sheath component.

Examples 4 to 6, Comparative Examples 3 and 4
It carried out like Example 1 except having changed the core-sheath compound ratio. The results are summarized in Table 2. If (B + C) / A is smaller than the range of the present invention as in Comparative Example 3, heat retention cannot be obtained. On the other hand, when (B + C) / A was larger than the range of the present invention as in Comparative Example 4, the dyeability was poor.

Example 7
The same procedure as in Example 1 was performed except that the sheath component PET was changed to CoPET1. The results are summarized in Table 3.

Examples 8 and 9, Comparative Example 5
It carried out like Example 7 except having changed the PET / PPS ratio of the core component. The results are summarized in Table 3. If the ratio of PET / PPS exceeds 0.2 as in Comparative Example 5, heat retention cannot be obtained.

Examples 10-12, Comparative Examples 6, 7
It carried out like Example 7 except having changed the core-sheath compound ratio. The results are summarized in Table 4. If (B + C) / A is smaller than the range of the present invention as in Comparative Example 6, heat retention cannot be obtained. If (B + C) / A is larger than the range of the present invention as in Comparative Example 7, the dyeability becomes poor.

Example 13
The same procedure as in Example 1 was performed except that the sheath component PET was changed to CoPET2. The results are summarized in Table 5.

Examples 14 and 15, Comparative Examples 8 and 9
The same procedure as in Example 13 was performed except that the PET / PPS ratio of the core component was changed. The results are summarized in Table 5. If (B + C) / A is smaller than the range of the present invention as in Comparative Example 8, heat retention cannot be obtained. When (B + C) / A was larger than the range of the present invention as in Comparative Example 9, the dyeability was poor.

Examples 16-18, Comparative Examples 10 and 11
It carried out like Example 13 except having changed the core-sheath compound ratio. The results are summarized in Table 4.

Example 19
The same procedure as in Example 1 was performed except that the core component PET was changed to PEN. The results are summarized in Table 7.

Examples 20, 21 and Comparative Example 12
This was carried out in the same manner as in Example 19 except that the PEN / PPS ratio of the core component was changed. The results are summarized in Table 7. If the ratio of PEN / PPS exceeds 0.2 as in Comparative Example 12, heat retention cannot be obtained.

  The fiber structure using the core-sheath conjugate fiber of the present invention can be suitably used as a fiber product that particularly requires heat retention, such as a clothing material, a non-clothing material, an industrial material, and the like. Among these, heat retention is necessary, and it is suitably used in applications where a dyeing process, a post-processing process, a false twisting process, and the like are essential.

Claims (6)

The sheath component (component A) is a polyester selected from polyalkylene terephthalate, polyalkylene naphthalate and copolymers thereof, and the core component is selected from polyalkylene terephthalate, polyalkylene naphthalates and copolymers thereof In the core-sheath type composite fiber constituted by the blend polymer of polyester (component B) and polyarylene sulfide (component C), the weight ratio of component A, component B and component C is represented by the following general formulas (1) and (2). A core-sheath type composite fiber characterized by being satisfied.
0.01 ≦ (B / C) ≦ 0.2 (1)
0.05 ≦ (B + C) / A ≦ 1 (2) The core-sheath composite fiber according to claim 1, wherein Component C is polyphenylene sulfide (PPS). The core-sheath-type composite fiber according to claim 1 or 2, wherein Component A is at least one selected from polyethylene terephthalate and a copolymer thereof. The core-sheath type composite fiber according to any one of claims 1 to 3, wherein component B is polyethylene terephthalate. The core-sheath type composite fiber according to any one of claims 1 to 4, wherein component A is copolymerized with an isophthalic acid component containing a metal sulfonate group. The core-sheath type composite fiber according to any one of claims 1 to 4, wherein Component A is a copolymer with polyoxyalkylene glycol.