JP2000226747A - Polyester-based combined filament yarn and woven or knitted fabric - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a polyester-based combined filament yarn having a soft touch feeling, good in dyeability and excellent in a dry feeling or a repulsive feeling by carrying out filament combining treatment of aliphatic polyester filaments different in degree of modified cross section and a woven or a knitted fabric using the combined filament yarn. SOLUTION: An aliphatic polyester consisting essentially of L-lactic acid is melt spun by using a spinneret for spinning and filament combining having two or more kinds of modified cross-section spinning holes and hollow holes arranged therein and the resultant filaments are drawn to afford a polyester- based combined filament yarn comprising filaments having two or more kinds of cross-sectional shapes in which at least one kind of the filament is a hollow filament having 5-50% percentage of hollowness and the degree of modified cross section of at least one kind of filament is within the range of 1.1-3.0 with >=0.1 difference in degree of modified cross section. Furthermore, the combined filament ratio of the filament having the maximum degree of modified cross section is 15-85% in the polyester-based combined filament yarn.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a polyester-based mixed yarn and a woven or knitted fabric, and more particularly, to a texture, particularly excellent in softness, good coloring, and dryness.
The present invention relates to a polyester mixed fiber having water absorption, resilience, and biodegradability, and a woven or knitted fabric using the polyester mixed fiber.

[0002]

2. Description of the Related Art Conventionally, aromatic polyesters such as polyethylene terephthalate have been widely used for clothing because of their excellent mechanical properties and various fastnesses. In order to produce high-quality clothing fabrics, various improvements have been made such as improvement in cross-sectional form, differential shrinkage mixing, mixing of different fineness, and ultrafineness, and have been established as general-purpose materials. Among these, various proposals have been made on the fiber-mixing technique for the purpose of imparting a feeling of tension and waist, resilience, and softness. Japanese Patent Application Laid-Open No. 7-34341 discloses an invention in which a fiber-to-fiber space is formed by mixing fibers having different cross-sectional shapes, and a capillary phenomenon is developed by the space to improve water absorption.
It is proposed in Japanese Patent Publication No.

[0003] However, fibers made of polyethylene terephthalate have a high refractive index of about 1.6 and therefore do not have sufficient coloring properties, and the polymer itself has a high Young's modulus, so that it was not possible to impart a sufficient soft feeling.

On the other hand, in recent years, environmental problems have become social problems in particular. However, aromatic polyesters represented by polyethylene terephthalate have extremely high durability and do not easily decompose in the natural environment. Unless the treatment is performed, there is a disadvantage that it remains semipermanently. In order to solve this problem, various proposals have recently been made for biodegradable fibers.

For example, Japanese Patent Application Laid-Open No. 8-158154 proposes the production of aliphatic polyester fibers having a hollow section and a multi-lobed section. However, this proposal is aimed at nonwoven fabric applications, and has a hollow cross section and a multi-leaf cross section in order to accelerate the biodegradation rate. Due to the heat history, fusion and unification of the single yarns occurred, and it was not possible to impart a new texture such as color development, softness, dryness, and water absorption for use in clothing.

Japanese Patent Application Laid-Open No. Hei 8-260323 proposes a nonwoven fabric in which two types of long fibers having different heat shrinkage properties are mixed. However, this proposal aims at improving form stability by heat-sealing with the aim of non-woven fabric use, and still cannot impart softness, resilience and color development in clothing use. Was.

Japanese Patent Application Laid-Open No. 9-324329 proposes a mixed fiber in which an aliphatic polyester fiber and a modified polyester fiber mainly composed of an aliphatic polyester are mixed. However, in this mixed fiber, the heat resistance of the modified polyester fiber is insufficient due to heat setting in the fabric manufacturing process because the heat resistance of the modified polyester fiber is insufficient, and the size of the fabric is changed because the modified polyester fiber has elastic properties. There is a problem that the stability is inferior and that the fabric manufacturing process becomes complicated.

[0008]

SUMMARY OF THE INVENTION The object of the present invention, which cannot be achieved by the above-mentioned prior art, is excellent in softness, resilience, and coloring when used as a woven or knitted fabric for clothing. It is an object of the present invention to provide a biodegradable polyester mixed fiber and a woven or knitted fabric using the polyester mixed fiber.

[0009]

SUMMARY OF THE INVENTION An object of the present invention is to provide a polyester mixed yarn comprising at least two kinds of filaments having different cross-sectional shapes, wherein at least one kind of the filament is an aliphatic polyester having a melting point of 130 ° C. or more. Can be achieved by a polyester-based mixed yarn characterized by being formed of a polyester mainly composed of

In the present invention, more preferably, as at least one kind of filament, a hollow filament having a hollow ratio of 5 to 50% and / or a modified cross-sectional filament having a degree of irregularity of 1.1 to 3.0 can be employed. .

In addition, the difference in irregularity between the filaments is 0.
It is more preferably 1 or more, and the mixing ratio of the filament having the highest irregularity is more preferably 15% to 85%.

Further, in the present invention, a woven or knitted fabric can be obtained by using at least a part of the above-mentioned polyester mixed fiber.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail.

The polyester-based mixed yarn of the present invention is a polyester-based mixed yarn comprising two or more kinds of filaments having different cross-sectional shapes, wherein at least one kind of the filament is mainly composed of an aliphatic polyester having a melting point of 130 ° C. or more. It is necessary to be formed of polyester.
By forming at least one filament from a polyester mainly composed of an aliphatic polyester, it is possible to improve the soft feeling and the coloring property, which are the objects of the present invention. Further, in order to impart biodegradability, it is preferable that all filaments are formed of an aliphatic polyester.

Polyesters other than polyesters mainly composed of aliphatic polyesters include polyethylene terephthalate, polybutylene terephthalate, and polypropylene terephthalate. In each case, the copolymer may contain 15 mol% or less of a copolymer component. . These polyesters are preferably mixed at a mixing ratio of 50% or less, more preferably 35% or less.

The polyester mainly composed of the aliphatic polyester forming at least one kind of filament forming the polyester-based mixed fiber of the present invention must have a melting point of 130 ° C. or more. If the melting point is lower than 130 ° C., the fibers will be fused and integrated in a heat setting step or a dyeing step during stretching, so that a soft feeling cannot be obtained and a melting defect occurs during friction heating, and the quality of the product is also low. Significantly worsens. The melting point of the aliphatic polyester is preferably at least 150 ° C, more preferably at least 160 ° C. Here, the melting point means a peak temperature of a melting peak obtained by DSC measurement.

Since the filament of the present invention is made of an aliphatic polyester, it has a good soft feeling unlike a filament made of an aromatic polyester. This good soft feeling is due to the fact that the Young's modulus of the fiber is clearly lower than that of the aromatic polyester fiber.

The aliphatic polyester used in the present invention has a melting peak peak temperature of 1 measured by DSC.
There is no particular limitation as long as the temperature is 30 ° C. or higher, and polylactic acid, polyglycolic acid, polyhydroxybutyrate, polyhydroxybutyrate valerate, and blends and modified products thereof can be used. Among them, polylactic acid is most preferable in consideration of the balance of properties such as melting point, Young's modulus, and refractive index for improving the softness, color development, and biodegradability, which are the objects of the present invention. The polylactic acid is preferably a polyester containing L-lactic acid as a main component. In order to improve fiber properties such as strength, the molecular weight of polylactic acid is preferably as high as possible, usually at least 50,000,
Preferably it is at least 100,000, more preferably 100,000 to 300,000. Main component of L-lactic acid means that 60% by weight or more of the component is composed of L-lactic acid, and a polyester containing D-lactic acid in a range not exceeding 40% by weight. Is also good.

Polylactic acid can be produced by a two-stage lactide method in which lactic acid 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.

In order to reduce the melt viscosity, a polymer such as polycaprolactone or polybutylene 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.

Further, the polyester mixed fiber of the present invention is:
It is necessary to be composed of filaments having two or more different cross-sectional shapes. By using two or more kinds of filaments having different cross-sectional shapes, voids can be formed between the single fibers, and the formation of the voids can improve lightness, repulsion, and water absorption. In order to exhibit such an effect, the cross-sectional shape of at least one filament constituting the polyester mixed fiber of the present invention should be multi-lobed, cross-shaped, cross-shaped, W-shaped, S-shaped.
It is necessary to have an irregular cross section such as a letter shape, an X shape, a flat shape, an elliptical shape, and a hollow shape.

When a filament having a hollow cross section having a round outer shape is used for at least one kind of filament and a filament having a round cross section is used for another filament, the above-mentioned void forming property between the single fibers is as follows. Although almost the same as the case of using a filament having an all round cross section, the effect of imparting a lightweight feeling by hollowing and an effect of improving the resilience by improving the bending rigidity are exhibited, and a good texture can be obtained as a cloth for clothing.

When a hollow cross-section filament is used as at least one of the filaments constituting the polyester-based mixed fiber of the present invention, the hollow ratio is preferably 5 to sufficiently exhibit the above-mentioned effect of improving lightness and resilience. Preferably it is 50%. If the hollow ratio is less than 5%, the effect of improving the lightness and resilience by hollowing may not be sufficiently exhibited. On the other hand, if the hollow ratio exceeds 50%, the hollow portion is liable to be crushed, and the above effects may not be sufficiently exhibited. The preferred range of the hollow ratio is 10 to 40%.

The measurement of the hollow ratio is performed by the following method.

After the hollow cross-section filament is cut in the transverse direction of the fiber at a thickness of 5 μm, a cross-sectional photograph is taken with an optical microscope, the fiber outer diameter area S1 and the hollow area S2 are measured, and the hollow ratio is calculated by the following equation. Calculation is performed for each single fiber, and the average value is defined as the hollow ratio.

Hollow ratio (%) = (S2 / S1) × 100 At least one component constituting the polyester-based mixed fiber of the present invention.
When the cross-sectional shape of the kind of filament is other than a hollow cross-section, as described above, the shape is multilobal, cross-shaped,
Cross-girder, W-shape, S-shape, X-shape, flat shape and elliptical shape, etc., among others, the effect of improving water absorption by forming voids between fibers, imparting dry feeling by forming an irregular cross section, and improving resilience feeling From the point of expression, the degree of irregularity (D / d) obtained by dividing the diameter (D) of the circumscribed circle of the fiber cross section by the diameter (d) of the inscribed circle of the fiber cross section is 1.1 to 3.0. It is preferably within the range. When the degree of irregularity is less than 1.1, since the degree of irregularity of the cross section is small, the manifestation of the above-described effects may be reduced. Conversely, if the degree of irregularity exceeds 3.0, problems such as fibrillation may occur, resulting in poor weaving. In the present invention, the preferable range of the degree of irregularity is 1.3 to 2.5.

The irregularity (D / d) defined in the present invention
Is calculated by the following method.

After the irregularly shaped filament is cut at a thickness of 5 μm in the direction of the fiber cross section, a cross-sectional photograph is taken with an optical microscope, and the diameter (D) of the circumscribed circle of the fiber cross section and the diameter of the inscribed circle of the fiber cross section are taken. (D) is measured, the degree of irregularity is calculated for each single fiber by the following formula, and the average value is defined as the degree of irregularity.

Degree of irregularity = D / d Of course, in the irregular cross-section such as the above-mentioned multi-leaf, cross, cross-girder, W-shape, S-shape, X-shape, flat-shape and ellipse, at least one fiber cross-section It is also effective to provide a hollow section having a hollow portion to improve the lightness. In this case, the inscribed circle of the fiber cross section in the present invention means an inscribed circle on the assumption that no hollow portion exists in the fiber.

In the polyester-based mixed fiber of the present invention, at least one kind of filament may have an irregular cross-section other than a round cross-section, but all filaments may have an irregular cross-section. In the case where all the filaments have an irregular cross-section, if at least two or more filaments having different cross-sectional shapes or irregularities are mixed, the desired effect of the present invention can be exhibited. In this case, the degree of irregularity is preferably at least 0.1 or more, more preferably 0.2 or more. However, if the difference in the degree of irregularity is too large, the fibers are likely to mesh with each other, which may cause a decrease in the inter-fiber space. Therefore, the difference in the degree of irregularity is preferably 1.8 or less.

The filament denier of two or more filaments having different cross-sectional shapes constituting the polyester-based mixed fiber of the present invention may be the same or different. However, when the single yarn fineness differs, the ratio of the single yarn fineness is preferably 3 times or less. When the single fiber fineness ratio is more than three times, the single fibers on the filament side with the finer single fiber fineness mesh with each other between fibers, and the formability of inter-fiber voids is reduced, and the performance such as lightness and water absorption is reduced. There is.

In order to further enhance the dry feeling, water absorbency and light weight feeling, it is preferable that the filament having the highest degree of irregularity constituting the polyester mixed fiber of the present invention has a higher fiber mixing ratio. Is preferably 15% or more. However, if the blending ratio of the filament having the highest irregularity is too high, the effect of blending filaments having different cross-sectional shapes is reduced, so the blending ratio is 85%.
The content is preferably set to the following, more preferably 30%.
~ 70%.

As the method for producing the polyester-based mixed fiber of the present invention, it is possible to produce the yarn by any of the so-called spinning and fiber-mixing methods. However, in order to improve the production cost and the breakage of the filament in the mixed fiber, the spinning method is preferable.

The present invention can be applied to any process such as a method in which the spinning and drawing steps are continuously performed, a method in which the undrawn yarn is once wound and then drawn, or a high-speed spinning method. Further, yarn processing such as false twisting or air entanglement may be performed as necessary.

In the case of producing a woven or knitted fabric using the polyester-based mixed fiber yarn of the present invention, there is no restriction on the weaving machine and the weaving and knitting structure. It is possible to produce a good woven or knitted fabric having a soft feeling, a repulsion feeling, and a coloring property, which are the objects of the present invention.

[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. Melting point Perkin Elmer's differential scanning calorimeter (DSC-7)
Was measured at a heating rate of 15 ° C./min, and the peak temperature of the obtained melting peak was defined as the melting point.

B. Melt Viscosity The relationship between the shear rate at 260 ° C. and the melt viscosity was measured using a Capillograph manufactured by Toyo Seiki Co., Ltd. A die with L / D = 10/1 (mm) was used for the measurement, and the shear rate was 1000 sec.
The viscosity at the time of ^-1 was defined as the melt viscosity of the sample. In addition, about polybutylene succinate, it measured at 190 degreeC.

C. Feeling characteristics (softness, coloring, resilience, dryness, lightness) For each item, a sensory test was performed by comparing the sample with a reference sample, and evaluated on a 4-point scale. And they were comprehensively evaluated, and "Excellent" was indicated by "A", "Excellent" was indicated by "A", "Normal" was indicated by "A", and "Inferior" was indicated by "X". For the reference sample, weaving and processing were carried out in the same manner as the above sample, using a blended yarn consisting of a single-thread fineness of 2 dtex x 18 fil made of polyethylene terephthalate and a triangular cross-section yarn of 2 dtex x 18 fil with an irregularity of 1.5 This was used as "poor x".

D. Using a Gakushin type flat abrasion machine for fibril resistance friction fastness test, using a georgette made of 100% polyethylene terephthalate as a friction cloth, the test cloth was abraded 500 times under a load of 500 g, and fibril The state of occurrence of chemical conversion was evaluated in three steps.
"Excellent" was represented by "O", "Normal" was represented by "A", and "Inferior" was represented by "X".

E. The measurement was carried out by the following method, applying the Vilec method in JIS L1096 "General textile test method".

First, a test piece of 1 cm × 20 cm is set as a sample, and five test pieces are taken in each of the horizontal directions. next,
Hold one end of the test piece and fix it.
Soak in distilled water. Next, the rising distance (mm) of the water from the liquid surface due to the capillary phenomenon after 10 minutes is measured, and the measured value is expressed by an average value of 5 times each in the vertical direction.

If the rise in water is difficult to read, add ink or a water-soluble dye (such as eosin) to distilled water, or attach a water-soluble dye (such as eosin) to the test piece in advance using a brush. Either method is used.

[Examples 1 to 6 and Comparative Example 1]
Vacuum dryer set at 60 ° C with a poly L-lactic acid chip (weight average molecular weight 185,000, L-form ratio 95%, D-form ratio 5%) having a melt viscosity of 1350 poise at 2 ° C at 260 ° C and 1000 sec ^-1 For 48 hours. Using a dried chip, a normal spinning machine is used to form 24 round holes, Y holes (four different hole shapes in Table 1), hollow holes, and flat slit holes at a spinning temperature of 260 ° C.
The yarn was spun at a speed of 1500 m / min using a die having 24 holes randomly arranged, and an undrawn yarn was wound up. Subsequently, the stretching ratio of the obtained undrawn yarn is adjusted using a normal hot roll-hot roll drawing machine so that the drawing yarn has an elongation of 35% at a drawing temperature of 78 ° C and a heat setting temperature of 115 ° C. Then, a drawn yarn of 150 dtex-48 fil was obtained. As a comparison,
The same poly-L-lactic acid chip was used for spinning and drawing in the same manner using a die having 48 round holes to obtain a 150 dtex-48 fil round cross-section drawn yarn. Table 1 shows the yarn shape and physical properties of the obtained drawn yarn.
Shown in

The obtained drawn yarn is subjected to a sweet twist of 300 t / m in number and used as a weft, and 50 dt separately prepared as a warp.
Using a poly-L-lactic acid drawn yarn having a round cross section of ex-36fil, a woven fabric having a satin texture was woven. After scouring the obtained woven fabric with hot water at 85 ° C, performing dry heat setting at 125 ° C, further treating with a 2.5% aqueous solution of sodium carbonate at 80 ° C for 10 minutes (weight reduction processing), and then dyeing at 120 ° C with wet heat, Finish setting was performed at 140 ° C. with dry heat. Table 1 shows the results of evaluating the obtained woven fabric characteristics.

[0046]

[Table 1] The woven fabrics obtained in Examples 1 and 2 had unprecedented softness, repulsion, and coloring, were excellent in dryness and lightness due to the irregularly shaped filament, and were luxurious. Furthermore, it had good fibril resistance and high water absorption. The color development was also very good.

In the woven fabric obtained in Example 3, since the irregularity of the irregularly shaped cross-section filament is slightly small, a rebound feeling, a dry feeling,
Although the lightness and the water absorption were slightly lower than those of Example 1, the softness and the color development were excellent and the fibril resistance was good as compared with the conventional one.

The woven fabric obtained in Example 4 has an unprecedented softness, resilience and coloring, and has a superior dryness and lightness due to the irregularly shaped filament, and a high quality with high water absorption. Although the woven fabric was overflowing, the fibril resistance was slightly inferior due to the somewhat large degree of irregularity of the irregularly-shaped cross-section filaments.

The woven fabric obtained in Example 5 was excellent in softness and excellent in resilience and lightness due to the hollow cross-section filaments. However, the dryness, water absorption and color development were as in Example 1. The effect was not so significant.

The woven fabric obtained in Example 6 had an unprecedented softness, resilience and color development, but the dryness and lightness were not as effective as in Example 1. .

On the other hand, the woven fabric obtained in Comparative Example 1 was insufficient in resilience and inferior in dryness and lightness because all filaments had a round cross section.

[Examples 7 to 10] 260 ° C. at 170 ° C.
Poly L- having a melt viscosity of 1580 poise at 1000 sec ^-1
Lactic acid chips (weight average molecular weight 200,000, L-form ratio 95%, D-form ratio 5%) were dried for 48 hours in a vacuum dryer set at 60 ° C. Spinning temperature using a dry chip with a normal spinning machine
Cap with 24 holes of 5 lobes at 260 ° C and 2 with different hole shapes
It was spun at a speed of 1700 m / min using a 4-hole hollow die, and the undrawn yarn was wound up. Subsequently, the obtained unstretched yarn was stretched at a stretching temperature of 80 ° C. and a heat setting temperature of 120 ° C. using an ordinary hot roll-hot roll stretching machine at an elongation of 3%.
Stretching is performed by adjusting the stretching ratio so as to be 5%.
A 75dtex-24fil drawn yarn was obtained. Table 2 shows the yarn shape and physical properties of the obtained drawn yarn.

Next, a mixed fiber of 150 dtex-48 fil was produced while performing the air entanglement treatment on the obtained five-leaf cross section yarn and the hollow fiber. The obtained mixed fiber was woven and processed in the same manner as in Example 1 to produce a satin woven fabric. Table 2 shows the results of evaluating the obtained woven fabric characteristics.

[0054]

[Table 2] The woven fabric obtained in Example 7 had a slightly low lightness and resilience due to the low hollow ratio of the hollow filaments of 3%, but had a softness, dryness, and color development that were unprecedented. And also had good fibril resistance and high water absorption.

The woven fabric obtained in Example 8 also had a slightly low hollow filament hollowness of 8%, but had unprecedented softness, dryness, and coloring, and had good fibril resistance. It also had a high water absorption.

The woven fabric obtained in Example 9 had unprecedented softness, resilience and coloring, was excellent in dryness and lightness, and was luxurious. Furthermore, it had good fibril resistance and high water absorption.

The woven fabric obtained in Example 10 had an unprecedented resilience, lightness, dryness and water absorbency. Fibril properties were also slightly inferior.

[Examples 11 to 13] Two kinds of Y holes having different discharge hole shapes were spun and drawn in the same manner as in Example 1 using a die in which 24 holes were randomly arranged.
A 48 fil drawn yarn was obtained.

The obtained three-lobed cross-section drawn yarn was woven and processed in the same manner as in Example 1 to produce a satin woven fabric. Table 3 shows the results of evaluating the shape, physical properties, and fabric properties of the obtained drawn yarn.

[0060]

[Table 3] The woven fabrics obtained in Examples 11 and 12 had unprecedented softness, resilience and coloring, were excellent in dryness and lightness, and were luxurious. Furthermore, it had good fibril resistance and high water absorption.
The color development was also very good.

The woven fabric obtained in Example 13 had an unprecedented softness, dryness and coloring. However, since the difference in the degree of irregularity between the two filaments was slightly small, the resilience and lightness were slightly lower than those in Example 11.

[Examples 14 and 15] A method similar to that of Example 1 using two types of discharge holes, a round hole and a Y hole, each of which is randomly provided with 18 holes / 36 holes and 12 holes / 48 holes. Spinning and drawing were performed to obtain a 150 dtex-48 fil drawn yarn.

The obtained round cross-section drawn yarn and trilobe cross-section drawn yarn were woven and processed in the same manner as in Example 1 to produce a satin woven fabric. Table 4 shows the results of evaluating the shape and physical properties of the obtained drawn yarn and the properties of the woven fabric.

[0064]

[Table 4] The woven fabric obtained in Example 14 had an unprecedented softness, resilience, and coloring, was excellent in dryness and lightness, and was a luxurious fabric. Furthermore, it had good fibril resistance and high water absorption. The color development was also very good.

In Example 15, since the single fiber fineness ratio between the round cross-section filament and the trilobal cross-section filament was slightly as large as 4 times, the trilobular cross-section filament was more likely to be filled between the round cross-section filaments. Although the fabricability such as softness, resilience, dryness, and lightness was slightly reduced as a whole due to a slight decrease in the formability, the conventional fabric (compared sample for texture evaluation)
And a better texture was expressed.

[Examples 16 to 19] Six different numbers of holes
A 6-leaf cross-section drawn yarn and a round cross-section drawn yarn having a fineness configuration shown in Table 5 were obtained in the same manner as in Example 9 using a leaf hole and a round hole die. Then, while performing the air entanglement treatment on the 6-leaf cross section yarn and the round cross section yarn in the same manner as in Example 9, 150 dtex-
A 48fil mixed yarn was produced. Example 1
Weaving and processing were performed in the same manner as described above to produce a satin fabric. Table 5 shows the results of evaluating the shape, physical properties, and fabric properties of the obtained drawn yarn.

[0067]

[Table 5] The woven fabrics obtained in Examples 17 and 18 had unprecedented softness, resilience and coloring, were excellent in dryness and lightness, and were luxurious. Furthermore, it had good fibril resistance and high water absorption.
The color development was also very good.

In Example 16, the dryness, lightness, and water absorption due to the irregular cross-section were slightly reduced due to the slightly low fiber mixing ratio of the 6-leaf cross-section yarn, but the softness, resilience, and coloring were good. It was a woven fabric.

In Example 19, the dryness, lightness, and water absorption due to the irregular cross section were good because the fiber mixture ratio of the six-leaf cross-section yarn was slightly high, but the softness and resilience were slightly reduced. Was.

[Examples 20 and 21] Spinning was performed at 1700 m / min using polyethylene terephthalate having an intrinsic viscosity (η) of 0.63 using round-hole bases having different numbers of holes, and then a hot roll-hot roll stretching machine was used. Using stretching temperature 85
At a heat setting temperature of 120 ° C., the drawn yarn was stretched at the same draw ratio so that the elongation of the drawn yarn became 35%. Then, the obtained P
While the ET drawn yarn and the polylactic acid yarn having a six-leaf cross section used in Examples 17 and 18 were subjected to the air entangling treatment in the same manner as in Example 9, a mixed fiber of 150 dtex-48 fil was produced. Next, the obtained mixed fiber was woven in the same manner as in Example 1,
Processing was performed to produce a satin fabric. Table 6 shows the results of evaluating the shape, physical properties, and fabric properties of the obtained drawn yarn.

[0071]

[Table 6] In Example 20, the softness was slightly inferior due to the slightly high fiber mixing ratio of the PET round cross-section yarn, and slightly irritable due to the difference in dyeability between the PET yarn and the polylactic acid yarn. The woven fabric had good properties.

The woven fabric obtained in Example 21 had unprecedented softness, resilience and coloring, was excellent in dryness and lightness, and was luxurious. Furthermore, it had good fibril resistance and high water absorption.

[Comparative Example 2] 190 ° C. at 1000 ° C. with a melting point of 112 ° C.
Polybutylene succinate chips having a melt viscosity at c- ¹ of 2000 poise were placed in a vacuum dryer set at 30 ° C. for 48 hours.
Dried. Using the dried chips, a conventional spinning machine was used at a spinning temperature of 190 ° C. and 24 round holes and 2 Y holes used in Example 1.
The yarn was spun at a speed of 600 m / min using a die in which four holes were randomly arranged, and an undrawn yarn was wound up. Subsequently, the obtained undrawn yarn is drawn using a normal hot roll-hot roll drawing machine at a drawing temperature of 25 ° C. and a heat setting temperature of 72 ° C. so that the drawn yarn has an elongation of 35%, A drawn yarn was obtained.

The obtained drawn yarn was woven in the same manner as in Example 1 and processed in the same manner as in Example 1 except that the dyeing temperature was set at 100 ° C. and the dry heat setting temperature was set at 100 ° C. to obtain a satin fabric. . In the obtained woven fabric, the filaments were fused together, a soft feeling was not obtained, the water absorption was low, and the dyeing temperature was low, so that the coloring property was extremely poor. Also, the fibril resistance is extremely poor,
The fused portion between filaments increased due to frictional heat at the time of wear, and the surface quality was significantly deteriorated.

[0075]

Industrial Applicability According to the present invention, a polyester-based mixed fiber and woven fabric which has excellent swelling feeling, soft feeling, resilience and coloring, and has dry feeling, water absorption and biodegradability, which has not been obtained before. A knit can be obtained.

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 4L035 AA09 BB33 BB77 BB89 CC20 DD02 DD03 EE05 EE20 FF10 HH01 HH10 4L036 MA05 MA19 MA20 MA33 PA01 PA03 PA33 UA01 UA12 UA16 4L045 AA05 BA03 BA10 BA25 BA57 BA57 BA57 AA20 AA37 AA39 AB07 AB09 AC00 BA01 BA02 CA00 CA04 CA07 CA12 EB04

Claims (7)

[Claims] 1. A polyester-based mixed yarn comprising two or more filaments having different cross-sectional shapes, wherein at least one filament is formed of a polyester mainly composed of an aliphatic polyester having a melting point of 130 ° C. or higher. A polyester blended yarn characterized by the following. 2. The polyester blended yarn according to claim 1, wherein at least one kind of filament is a hollow filament having a hollow ratio of 5 to 50%. 3. The polyester blended yarn according to claim 1, wherein the degree of irregularity of at least one filament is in the range of 1.1 to 3.0. 4. The polyester blended yarn according to claim 1, wherein a difference in irregularity between two or more filaments having different irregularities is 0.1 or more. . 5. The polyester-based mixed yarn according to claim 1, wherein the mixed ratio of the filament having the highest degree of irregularity is 15% or more and 85% or less. 6. The polyester according to claim 1, wherein the aliphatic polyester is a polyester containing L-lactic acid as a main component.
6. The polyester mixed fiber yarn according to any one of the items 5 to 5. 7. A woven or knitted fabric comprising at least a part of the polyester-based mixed yarn according to any one of claims 1 to 6.