JP2002220758A - Polyester combined filament yarn - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a polyester combined filament yarn which comprises two or more polyester fiber groups, wherein at least one fiber group comprises polypropylene terephthalate and another fiber group comprises polyethylene terephthalate, has an excellent volume feeling, excellent resiliency by at least one fiber group having modified cross-sections, and has good functional properties such as a soft feeling, a dry feeling, lightweight and water absorbability. SOLUTION: This polyester combined filament yarn comprising two or more polyester fiber groups is characterized in that at least one polyester fiber group comprises polypropylene terephthalate and the other fiber group comprises polyethylene terephthalate, in that at least one polyester fiber group has modified cross-sections having multi-lobar cross-sectional shapes in a modification degree of 1.7 to 6.0, and in that the rate of the fibers having the modified cross sections in the blended yarn is >=20% of the total fineness.

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 containing fibers having irregular cross-sections, and more particularly, to a soft, flexible, dry, and lightweight material having excellent swelling and resilience. And a polyester mixed yarn having water absorbency.

[0002]

2. Description of the Related Art Conventionally, mixed yarns comprising a plurality of synthetic fiber filament yarns have been widely used for clothing because of their excellent mechanical properties and various fastnesses. And, in order to manufacture high-quality clothing fabrics, improvement of cross-sectional form and shrinkage
Various improvements such as mixed fineness and ultrafineness have been made, and have been established as general-purpose materials.

[0003] Among them, the differential shrinkage mixed fiber technique is widely used as a technique for imparting a swelling feeling. For example, Japanese Patent Laid-Open No. 1-20320 discloses a shrinkage differential mixed fiber using a specific copolymerized polyester as one of them. Kaihei 2-19528
This is disclosed in Japanese Patent Publication No. The use of the mixed fiber obtained according to these disclosures can also impart a large swelling feeling to the fabric, but the high shrinkage yarn excessively shrinks during the heat treatment in the high-order processing step, so that the fabric is roughened. A hard feeling was generated, and a cloth having a sufficient soft feeling could not be obtained.

On the other hand, polypropylene terephthalate fiber has an excellent elongation elastic recovery rate, a low Young's modulus, good dyeability, and is chemically stable.
No. 732 discloses a method of blending with polyester and utilizing a difference in heat shrinkage to obtain a woven or knitted fabric having a feeling of swelling and softness. Further, Japanese Patent Application Laid-Open No. There is disclosed a method for obtaining a fabric having good dyeing properties with a soft feeling and a soft feeling. With the mixed fiber according to these proposals, a woven / knitted fabric having a swelling feeling and a soft feeling can be obtained, but a woven / knitted fabric having a dry feeling, a light weight feeling, and water absorbency cannot be obtained.

[0005]

SUMMARY OF THE INVENTION The object of the present invention is to provide a soft, flexible, dry, lightweight, water-absorbing, and other functional material which is not achievable with the above-mentioned prior art and which is excellent in swelling and rebound. An object of the present invention is to provide a polyester-based mixed fiber having properties.

[0006]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a mixed fiber comprising at least one kind of polyester fiber composed of polypropylene terephthalate and the other fiber group composed of polyethylene terephthalate. Wherein at least one of the fiber groups is an irregular cross section having a multi-lobed cross section, and the degree of irregularity is 1.7 to
6.0, and the proportion of the irregular cross-section contained in the mixed fiber is 20% or more of the total fineness.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the present invention will be described in detail.

The polyester mixed yarn of the present invention is a mixed yarn consisting of at least two kinds of polyesters, which is excellent in swelling, is soft and flexible, and has a dry feeling, light weight and water absorption. One fiber group is made of polypropylene terephthalate, the other fiber group is made of polyethylene terephthalate, and at least one of the fiber groups has a multi-lobed cross-sectional shape.

In order to exhibit the effects of the present invention, in the present invention, at least one of the fiber groups constituting the mixed yarn has an irregular cross section, and the irregularity thereof is 1.7 to 6.0.
By setting the degree of irregularity to 1.7 or more, the gap between the single fiber fibers increases, and the water absorption can be increased. Further, by increasing the number of voids, it is possible to impart a lightweight feeling. However, if the degree of irregularity is too large, the fibers are broken or fibrillated, which results in poor weaving or a decrease in product quality. Therefore, the degree of irregularity is set to 6.0 or less. In order to further exhibit the effects of water absorption and lightness and to maintain the weaving property, the degree of irregularity is preferably in the range of 2.0 to 4.0.
The degree of irregularity referred to in the present invention is determined by the following method.

(Degree of irregularity) = L1 / L2 where L1: diameter of circumscribed circle of fiber cross section L2: diameter of inscribed circle of fiber cross section Further, in the polyester mixed fiber of the present invention, dry feeling and light weight are obtained. In order to give a feeling and water absorption, it is preferable that the cross-sectional shape of the fiber is an irregular cross-section having a multi-lobed cross-sectional shape. In order to impart sufficient dry feeling, light weight feeling and water absorption, it is more preferable to have a multi-leaf cross-sectional shape having 3 to 6 concave portions. When there are three to six concave portions in the cross-sectional shape, there are sufficient voids formed between the fiber single yarns, and the water absorption due to the capillary phenomenon and the lightness due to the voids between the fiber single yarns and the dry feeling due to the multi-leaf cross section are provided. Can be expressed.

In order to further exhibit the effects of the present invention, in addition to the above-mentioned cross-sectional shape, the depth of the concave portion is, as shown in FIG. B, and the ratio A / B is preferably 2.0 or more. More preferably, it is 3.5 or more.

In order to exhibit the effect of the present invention, the ratio of the irregular cross section of the mixed fiber is set to 20% or more of the total fineness. When the ratio of the irregular cross section is 20% or more, water absorption, lightness, and dry feeling can be obtained by the irregular cross section. Here, the ratio of the irregular cross section of the mixed fiber is the ratio of the degree of irregularity in the mixed fiber, and all the fiber groups constituting the mixed fiber may have the irregular cross section.

The polypropylene terephthalate used in the present invention refers to terephthalic acid as a main acid component,
Polyester obtained by using 3-propanediol as a main glycol component, and polyethylene terephthalate is a polyester obtained by using terephthalic acid as a main acid component and ethylene glycol as a main glycol component. A copolymer component may be contained.

In order to further enhance the swelling feeling of the mixed fiber of the present invention, it is preferable that at least one of the polyesters constituting the mixed fiber contains a copolymerized polyester, and from the viewpoint of heat resistance. , The copolymerization amount is 5 to 15
More preferably, it is mol%. The copolymerization amount is more preferably from 7 to 13 mol% in order to improve the swelling feeling and the spinning property. Also, if necessary, matting agent,
If necessary, inorganic fine particles and organic compounds can be added as deodorants, flame retardants, yarn abrasion reducing agents, antioxidants, coloring pigments and the like.

The copolymerization components include aromatic dicarboxylic acids, aromatic dicarboxylic acid components having a sulfonic acid group and derivatives thereof, aromatic dicarboxylic acid components having a phosphoric acid group and derivatives thereof, aliphatic dicarboxylic acids, and aliphatic diols. , Alicyclic diols, aromatic diols, or high molecular diols to which ethylene oxide or the like is added, and specific examples thereof include isophthalic acid, adipic acid, and naphthalene-2,6-dicarboxylic acid. Acid, sebacic acid, 5-sodium sulfoisophthalic acid,
5-sodium sulfoterephthalic acid, 5-potassium sulfoisophthalic acid, 5-potassium sulfoterephthalic acid, 5
-Lithium sulfoisophthalic acid, 3,5-di (carbo-
sodium β-hydroxyethoxy) benzenesulfonate, potassium 3,5-di (carbo-β-hydroxyethoxy) benzenesulfonate, 3,5-di (carbo-β-
(Hydroxyethoxy) lithium benzenesulfonate, 5
EO addition of dimethyl sodium sulfoisophthalate, dimethyl 5-potassium sulfoisophthalate, dimethyl 5-lithium sulfoisophthalate, 1,4-butanediol, diethylene glycol, trimethylene glycol, cyclohexanediol, bisphenol A, bisphenol sulfone, bisphenol A EO adducts of bisphenolsulfone and the like can be preferably used. Further, polyethylene glycol or the like may be used in combination. More preferably, in order to increase the shrinkage of the polyester, it is preferable to use isophthalic acid and an EO adduct of bisphenol A in combination.

In order to further improve the effect of the present invention, the difference in shrinkage between at least two kinds of fibers constituting the mixed fiber is 5%.
It is preferable that the fiber group having the above-mentioned shape and the irregular cross-sectional shape is a low shrinkage yarn. When the difference in shrinkage is 5% or more, the feeling of swelling is improved, and since the group of fibers having an irregular cross-sectional shape is a low shrinkage yarn, the irregularly-shaped yarn appears on the surface of the mixed fiber, resulting in a dry feeling. Is improved.

Furthermore, in order to improve the effects of the present invention,
It is preferable that one of the blended yarns is made of polypropylene terephthalate having a modified cross section that exhibits the effects of the present invention, and the other is a copolymerized polyethylene terephthalate. With the configuration of the mixed fiber, the polypropylene terephthalate having an irregular cross section appears on the surface of the mixed fiber, so that the effect of the present invention, that is, the feeling of swelling, resilience, and softness, is further improved.

The polyester mixed fiber of the present invention is preferably subjected to a fluid entanglement treatment in order to improve the processability in knitting and weaving, and the preferable entanglement degree is 5 to 60 yarns / m. . In particular, if the yarn is a mixed fiber, the tendency is high, and by setting the degree of entanglement to 5 yarns / m or more, the yarn formability, weaving property and knitting property can be improved. In order to improve the spinning property, weaving property and knitting property, the degree of entanglement is 15 to 4
0 / m is preferred. The method of measuring the degree of confounding is disclosed in
According to the method disclosed in JP-A-8-28708.

The polyester mixed fiber of the present invention can be produced by any of the so-called spinning and fiber blending methods and the post-fiber blending method in which spinning and drawing are performed separately. As the spinning fiber mixing method, there are a method of simultaneously spinning two different polymers from one die, a method of spinning a single component polymer from each of the different die, and combining and winding at the time of winding, and a method of post-fiber mixing. Examples thereof include a method of separately winding and winding two kinds of polymers, and a method of combining the two in a stretching step.
In order to improve the twist of the fiber group in the mixed fiber,
A method in which two different kinds of polymers are simultaneously produced from one spinneret is preferable.

The polyester-based mixed yarn of the present invention is an object of the present invention by applying to a high-order processing technology.
The feeling of swelling, rebound, and softness can be improved. In addition, as a high-order processing technology, normal drawing, thick and thin drawing with a thickness in the fiber longitudinal direction, air processing,
False twist and the like.

[0021]

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. Intrinsic viscosity It is a value measured in orthochlorophenol (25 ° C).

B. Water absorption By the birec method, the lower end of a strip sample having a length of 12 cm and a width of 1 cm was immersed in distilled water at 20 ± 2 ° C.
The water absorption height (mm) after one minute was measured, and those having a water absorption height of 40 mm or more were judged to have high water absorption.

C. Shrinkage difference The mixed fiber is divided into polypropylene terephthalate and polyethylene terephthalate, each of which is 111 mg / dte
After applying a load of x and measuring the sample length (L0), the sample was subjected to boiling water treatment for 15 minutes with no load, allowed to dry naturally, and then again subjected to a load of 111 mg / dtex to obtain a sample length (L1). After measuring and calculating the respective shrinkage ratios (W1 (high shrinkage yarn) and W2 (low shrinkage yarn)), the difference between the respective shrinkage ratios is calculated by the following equation. D. Shrinkage (%) = [(L0−L1) / L0] × 100 Shrinkage difference (%) = W1−W2 Texture characteristics (swelling, resilience, softness, dryness, lightness) For each item, a sensory test was conducted by comparing the sample with a reference sample. “Yes” is indicated by a four-point scale of “○”, “Normal” is indicated by “△”, and “Inferior” is indicated by ×. As a reference sample, a 167 dtex-72 fill drawn yarn having a round cross-section made of polyethylene terephthalate, woven and processed in the same manner as the above sample was used, and this was evaluated as “poor: ×”. .

E. Operability Evaluated based on the occurrence of yarn breakage and tarmi when each level (200 yarns) was processed. Thread breakage, Talmy occurrence rate less than 2% ○ Thread breakage, Talmy occurrence rate of 2% or more and less than 5% ○ Thread breakage, Talmy occurrence rate of 5% or more and less than 10% △ Thread breakage, Talmy occurrence rate of 10% or more ×.

Examples 1 to 5 and Comparative Examples 1 and 2 Fiber group (A) comprising polyethylene terephthalate obtained by copolymerizing an EO adduct of isophthalic acid and bisphenol A
And a fiber group (B) made of polypropylene terephthalate having a multi-leaf cross-section from the same die in a spinning take-off speed of 15
After drawing at a speed of 00 m / min, the film is stretched and entangled by 20 to 30 minutes.
And wound up.

Using the obtained mixed yarn, the amount of copolymerization, the number of recesses in the cross-sectional shape (hereinafter referred to as the number of recesses), the mixing ratio of the fiber group (A), and the degree of irregularity are changed to fabric. Created. Table 1 shows the properties of the obtained drawn yarn and woven fabric.

In Example 1, although the blending ratio of the modified cross-section yarn made of polypropylene terephthalate was slightly low, the rebound feeling and softness were good, and the dryness, lightness and water absorption were excellent, and the swelling feeling was excellent. Was something. Furthermore,
There was no problem in operability.

In Example 2, the modified cross-section yarn made of polypropylene terephthalate was excellent in resilience, softness, dryness, lightness, and water absorption, and extremely excellent in swelling. Furthermore, there was no problem in operability.

Example 3 has a high blending ratio of a modified cross-section yarn made of polypropylene terephthalate, is extremely excellent in resilience and softness, has extremely excellent dryness, lightness and water absorption, and is excellent in swelling. Was something. Furthermore, there was no problem in operability.

In Example 4, the modified cross-section yarn made of polypropylene terephthalate was excellent in resilience and softness, and extremely excellent in dryness, lightness and water absorption. Operability decreased slightly.

In Example 5, the irregular blended yarn made of polypropylene terephthalate had a high fiber mixture ratio, was extremely excellent in resilience and softness, was extremely excellent in dryness, lightness and water absorption, and was extremely excellent in swelling. Met. Furthermore, there was no problem in operability.

In Comparative Example 1, since the blending ratio of the modified cross-section yarn made of polypropylene terephthalate was low, the repulsive feeling,
Since the softness was low and the degree of irregularity of the modified cross-section yarn was low, the dryness, lightness, and water absorption were small, and the swelling was slightly small.

Comparative Example 2 was excellent in resilience and softness due to the polypropylene terephthalate blend ratio, but lacked dryness, lightness and water absorbency, and had a rather small swelling feeling because it had no irregular cross section. Met.

Examples 6 to 8 A fiber group (A) composed of polyethylene terephthalate copolymerized with 8.0 mol% of IPA and a fiber group (B) composed of polypropylene terephthalate having a multi-leaf cross section having a degree of irregularity of 2.3. From the same die at a spinning take-off speed of 1500 m /
Minutes, stretch and stretch to give 167 dt
It was wound up with ex-72fil. The mixing ratio is A / B
= 50/50.

Using the obtained mixed fiber, the number of concave portions and the number of entanglements in the cross-sectional shape were changed to prepare a woven fabric. Table 2 shows the properties of the obtained drawn yarn and woven fabric.

Example 6 was excellent in resilience and swelling,
Further, it had a soft feeling, a dry feeling, and a light feeling. In addition, there was no problem in operability because confounding was sufficiently contained.

Example 7 was excellent in resilience and swelling,
In addition, it was excellent in softness, dryness and lightness, and extremely excellent in water absorption. In addition, there was no problem in operability because confounding was sufficiently contained.

Example 8 was excellent in resilience and swelling,
In addition, it was excellent in softness, dryness, and lightness, and extremely excellent in water absorption, but operability was slightly lowered because of no confounding.

Examples 9 and 10 A fiber group (A) composed of polyethylene terephthalate and a fiber group (B) composed of polypropylene terephthalate obtained by copolymerizing 8.0 mol% of an EO adduct of isophthalic acid and bisphenol A with the same die. Spinning take-off speed 2500m
/ Min, then stretched, and entangled 20 to 30 pieces / m
It was applied and wound up.

Table 3 shows the properties of the obtained drawn yarn and woven fabric.

Example 9 was excellent in swelling and rebound,
In addition, it was excellent in softness, dryness, and lightness, and extremely excellent in water absorption.

In Example 10, the mixed fiber ratio of the irregular cross section was 10%.
Since it was 0%, it had extremely excellent water absorption, and had a dry feeling and a light feeling. In addition, it had excellent swelling and rebound.

[0044]

[Table 1]

[0045]

[Table 2]

[0046]

[Table 3]

[0047]

According to the present invention, in addition to the feeling of swelling and resilience when a conventional polyester-based mixed yarn is woven and knitted,
A polyester-based mixed fiber having a soft feeling, a water absorbing property and a light feeling can be obtained. In addition, this woven or knitted fabric is suitable for various uses, including apparel applications, and not only provides a woven or knitted fabric having excellent quality, but also provides a functional yarn such as dry touch and lightweight feeling. It is possible. Furthermore, because two types of polyester are used,
There is a heterochromatic property and a feeling of heather is developed.

[Brief description of the drawings]

FIG. 1 is a view showing an example of a fiber having an irregular cross section according to the present invention.

Claims (3)

[Claims] 1. A mixed fiber comprising two or more polyesters, wherein at least one of the fiber groups is composed of polypropylene terephthalate and the other fiber group is a mixed fiber composed of polyethylene terephthalate, and at least one of the fiber groups is composed of polyethylene terephthalate. It is a modified cross section having a multi-lobed cross-sectional shape, the degree of irregularity is 1.7 to 6.0, and the ratio of the modified cross section included in the mixed fiber is 20% or more of the total fineness. Polyester mixed yarn. 2. The polyester mixed yarn according to claim 1, wherein the mixed yarn has a difference in shrinkage of 5% or more, and the group of fibers having an irregular cross section is a low shrink yarn. 3. The fiber group according to claim 1, wherein the fiber group having an irregular cross section of the mixed fiber is polypropylene terephthalate, and the other fiber group consisting of polyethylene terephthalate is copolymerized polyethylene terephthalate. Polyester blend yarn.