JP2001355131A - Polyester conjugated fiber - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a modified bimetal polyester composite fiber consisting of a polyester, being a side by side type conjugated fiber consisting of one component of a polypropyle terephthalate and another one of a polyethylene terephthalate, and having functionalities such as a dry feeling, light weighted feeling and water-absorbing property in addition to stretching property, soft feeling and an appearance having specific crimps by having a modified cross section. SOLUTION: This polyester conjugated fiber is characterized by consisting of a polyester, being a side by side type composite fiber consisting of one component of a polypropylene terephthalate and another one of a polyethylene terephthalate, and having that the cross sectional shape of the above composite fiber is the modified cross section.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a side-by-side type irregularly shaped polyester composite fiber made of polyester, one of which is polypropylene terephthalate and the other is polyethylene terephthalate. More specifically, the invention utilizes a capillary phenomenon of a highly irregular cross section. By adding crimp expression by bimetal with soft feeling to water absorption,
The inter-fiber voids are further increased, the capillary phenomenon is much more likely to occur, the water absorption is improved, the stretchability without rough and hard feeling due to the high profile cross section, soft feeling, dry feeling, light weight feeling,
The present invention relates to a polyester composite fiber having functionality such as water absorption.

[0002]

2. Description of the Related Art Conventionally, many studies have been made to make polyester fibers approach the texture of various natural fibers, and many studies have been made to approach the texture of high value-added silk. Since silk-like texture can be obtained by making the fiber an irregular cross section,
Accordingly, studies have been made to provide other functions in addition to the stretchability provided by the side-by-side composite.

For example, Japanese Patent Application Laid-Open No. 63-219628 discloses a W-shaped cross section of a side-by-side composite fiber, and Japanese Patent Application Laid-Open No. 2-68311 discloses an L-shaped cross section of a side-by-side composite fiber. A method for obtaining a fiber having a deep color and a silky texture is disclosed in
JP-A-214433 discloses a method of blending flat side-by-side type composite fibers to obtain a silk-like woven knitted fabric having swelling and tension. The side-by-side type composite fibers according to these proposals can certainly obtain woven or knitted fabrics having a silky texture, but cannot obtain woven or knitted fabrics capable of simultaneously obtaining high water absorption.

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. 0, JP-A-52-8124, etc., which have been known for a long time as a single component, but have excellent crimping properties, dryness, lightness and water absorption due to composite and irregular cross-sections. There were no woven or knitted fabrics.

[0005]

SUMMARY OF THE INVENTION The object of the present invention is to provide, in addition to the silky texture having stretchability, softness and crimpability, which could not be achieved by the above prior art, dryness, lightness, water absorption and the like. An object of the present invention is to provide a modified bimetallic polyester composite fiber having the above-mentioned functionality.

[0006]

In order to achieve the above object, the present invention employs the following constitution. That is, (1) a polyester conjugate fiber which is a side-by-side conjugate fiber composed of polyester, one of which is polypropylene terephthalate and the other is polyethylene terephthalate, wherein the cross-sectional shape of the conjugate fiber is irregular. (2) The polyester composite fiber according to (1), wherein the degree of irregularity of the irregular cross section is 1.7 to 6.0. (3) The polyester composite fiber according to (1) or (2), wherein the irregular cross section has a multi-lobed cross-sectional shape having three or more concave portions. (4) Any one of the above (1) to (3), wherein at least one of the polyesters constituting the conjugate fiber is a copolymerized polyester, and the copolymerization amount is 5 to 15 mol%. Polyester conjugate fiber according to 1.

[0007]

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

The modified bimetallic polyester composite fiber of the present invention is composed of a polyester, one of which is polypropylene terephthalate and the other is polyethylene terephthalate, in order to obtain stretchability, softness and crimpability. Is what is being done. In order to exhibit sufficient crimp characteristics, the composite ratio of the one polyester and the other polyester is preferably from 60:40 to 40:60.

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.

The intrinsic viscosity of the polypropylene terephthalate is preferably 0.7 or more and 1.6 or less. When the ratio is 0.7 or more, the crimp expression is sufficiently obtained to obtain a stretchable material. In addition, the intrinsic viscosity is 1.
When it is 6 or less, a soft feeling is more exhibited.
More preferably, the intrinsic viscosity of polypropylene terephthalate is 0.8 or more and 1.4 or less.

On the other hand, the polyethylene terephthalate used in the present invention is terephthalic acid as a main acid component,
It is a polyester obtained by using ethylene glycol as a main glycol component, and its intrinsic viscosity is preferably 0.45 or more and 0.7 or less. When the content is 0.45 or more, sufficient crimping can be obtained, and a stretchable material can be obtained. When the intrinsic viscosity is 0.7 or less, there is a sufficient difference in viscosity from polypropylene terephthalate, the expected crimping can be obtained, and the intended functions such as stretchability can be obtained.

Further, the modified bimetallic polyester conjugate fiber of the present invention may contain a copolymerized polyester in at least one of the polyesters constituting the conjugate fiber in order to develop more crimping properties. From the viewpoint of heat resistance, the copolymerization amount is preferably 5 mol% or more and 15 mol% or less. The copolymerization amount is more preferably from 7 to 13 mol% in order to improve the crimping and the spinning property. In addition, matting agents, deodorants, flame retardants,
If necessary, inorganic fine particles and organic compounds can be added as a yarn friction reducing agent, an antioxidant, a coloring pigment, and the like.

The copolymerization components include aromatic dicarboxylic acids, aromatic dicarboxylic acid components having sulfonic acid groups and derivatives thereof, aromatic dicarboxylic acid components having phosphoric acid groups 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, an EO adduct of isophthalic acid and bisphenol A is preferably used in order to increase the shrinkage of the polyester.

Furthermore, in order to exhibit the effects of the present invention, the present invention is characterized in that the conjugate fibers constituting the bimetallic polyester composite fibers have an irregular cross section. Furthermore, in the conjugate fiber of the present invention, the irregularity of the irregular cross section is preferably 1.7 to 6.0 in order to exhibit a sufficient effect. 1.7 degree of irregularity
By doing so, the voids between the single fiber fibers increase, and the water absorption increases. 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 may be broken or fibrillated, resulting in poor weaving or deterioration in product quality. Therefore, the degree of irregularity is preferably 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 more 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.

(Deformation degree) = L1 / L2 where L1: diameter of circumscribed circle of fiber cross section L2: diameter of inscribed circle of fiber cross section Further, in the modified bimetallic polyester composite 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. It can be sufficiently expressed.

In order to further exhibit the effects of the present invention, in addition to the above-described cross-sectional shape, the depth of the concave portion is, as shown in FIG. 1, a tangent A between adjacent convex portions, and a perpendicular line B between the deepest portion of the concave portion and the tangential line A. And the ratio A / B is preferably 2.0 or more. More preferably, it is 3.5 or more.

In the method for producing the modified bimetallic polyester composite fiber of the present invention, polypropylene terephthalate and polyethylene terephthalate are brought to the same spinning temperature,
It can be manufactured by a method of melting and bonding to a side-by-side type to obtain a composite fiber. As a spinning method for obtaining an irregular cross-sectional shape, the spinneret can be manufactured by forming a die discharge hole into an arbitrary shape and winding it at an arbitrary spinning speed. By stretching the wound yarn at an arbitrary magnification, a conjugate fiber exhibiting the effects of the present invention can be obtained, but the production method of the present invention is not limited to this.

The modified bimetallic polyester composite fiber of the present invention can be imparted with other properties by blending with another fiber. For example, a heather tone can be obtained by mixing with fibers having different dyeing properties, or a swelling feeling can be obtained by mixing with fibers having different shrinkage characteristics. Examples of the fiber mixing method include a spinning fiber mixing method in which yarns are simultaneously formed from a single die, and a fiber mixing method after combining and winding in a stretching step.

[0019]

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 Absorbency 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. by a birec method, and the water absorption height (cm) after 10 minutes was measured. C. The number of crimps was treated in boiling water at 100 ° C. for 15 minutes, and the number of peaks between 1 cm of single yarns was measured. D. Feeling characteristics (dry feeling, light feeling, stretchability, soft feeling) For each item, a sensory test was performed by comparing the sample with the reference sample, and "very good" was XX, and "excellent" was 、, “normal” was indicated by Δ, and “inferior” was indicated by four-point evaluation of ×. In addition, what was woven and processed in the same manner as the above-mentioned sample using a drawn yarn having a round cross section of 56 dtex-12fil made of polyethylene terephthalate was used as a reference sample, and this was evaluated as “poor: ×”. . E. FIG. Operability Evaluated based on the occurrence of yarn breakage and tarmi when each level (200 yarns) was processed.

Thread breakage, Talmi generation rate less than 5% ○ Thread breakage, Talmi generation rate of 5% or more and less than 10% △ Thread breakage, Talmi generation rate of 10% or more × Examples 1-3 and Comparative Example 1 Intrinsic viscosity is 1. A copolymerized polypropylene terephthalate obtained by copolymerizing 10% by mole of isophthalic acid of 41 with polyethylene terephthalate having an intrinsic viscosity of 0.56;
At a ratio of 0:50, the composite was formed into a side-by-side type, and the spinning speed of 18 from the die of the irregularly shaped discharge hole having the fiber cross section shown in FIG.
After drawing at 00 m / min, it was stretched and wound up. Table 1 shows the obtained drawn yarn characteristics.

Next, a plain fabric was woven using the obtained drawn yarn. Table 1 shows the properties of the obtained woven fabric.

In Example 1, a fabric having a sufficient crimp, an extremely excellent stretch property and a highly deformed cross-section to provide a soft feeling with excellent dry feeling, light weight feeling and water absorption. was gotten.

In Example 2, a fabric having a sufficient crimp, excellent stretchability, and a highly deformed cross-section provides a soft feeling of dryness, lightness and water absorbency. It was obtained, but the irregularity was slightly higher,
Some fibrillation was observed.

Example 3 has a crimp and a fiber cross section which are very suitable for exhibiting the effects of the present invention, and has extremely excellent stretchability, dry feeling, light weight feeling and water absorption. It had a soft feeling. Furthermore, there was no problem in operability.

Comparative Example 1 had excellent stretchability and softness due to crimping, but lacked dryness, lightness, and water absorption because the cross-sectional shape was round. .

Comparative Example 2 has a highly irregular cross section and has a dry feeling, a light weight feeling, and water absorbency, but does not exhibit crimp, is not stretchy, and is a PET because it is not a side-by-side type vital yarn. Therefore, there was no soft feeling.

Examples 4 to 7 Copolymerized polypropylene terephthalate in which the copolymerization amount of isophthalic acid and bisphenol A EO adduct was used in combination as shown in Table 2 was mixed with polyethylene terephthalate having an intrinsic viscosity of 0.50 in a composite ratio of 50: The spinning speed is combined with the side-by-side type at 50, and the spinning speed is 180
After drawing at 0 m / min, the film was stretched and wound up. Table 2 shows the obtained drawn yarn characteristics. Next, a woven fabric is woven using the obtained drawn yarn, and the properties of the obtained woven fabric are shown in Table 2.

Example 4 has excellent stretchability and softness, and has extremely excellent dryness, lightness and water absorbability by highly deforming the fiber cross section. The crimp was slightly lower.

In Example 5, a material having an extremely excellent stretchability, a soft feeling and a highly deformed fiber cross section by having a sufficient crimp, thereby having an excellent dry feeling, light weight feeling and water absorbability. became.

Example 6 has a crimp suitable for further exhibiting the effects of the present invention, and has an extremely excellent stretchability, softness, dryness, and lightness by deforming the fiber cross section to a high degree. And water-absorbent. Furthermore, there was no problem in operability.

Example 7 had sufficient crimp and highly deformed fiber cross-sectional shape, resulting in extremely excellent stretchability, softness, dryness, lightness and water absorption. However, the operability was somewhat low because the copolymerization amount was rather large.

[0032]

[Table 1]

[0033]

[Table 2]

[0034]

According to the present invention, in addition to the specific appearance of crimping when a conventional side-by-side type conjugate fiber is formed into a woven or knitted fabric, the modified bimetallic polyester has stretchability, softness, water absorption and light weight. A woven or knitted fabric of fibers 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.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing an example of an irregular cross-section fiber of the present invention composed of polyesters (a) and (b).

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 4L041 AA08 BA02 BA05 BA09 BA38 BA60 BC02 BD14 CA06 CA08 CA14 DD01 DD04 DD10 DD15

Claims (4)

[Claims] 1. A side-by-side composite fiber comprising polyester, one of which is polypropylene terephthalate and the other is polyethylene terephthalate,
A polyester conjugate fiber, wherein the cross-sectional shape of the conjugate fiber is irregular. 2. The polyester composite fiber according to claim 1, wherein the degree of irregularity of the irregular cross section is 1.7 to 6.0. 3. The polyester composite fiber according to claim 1, wherein the irregular cross section has a multi-lobed cross section having three or more concave portions. 4. The polyester according to claim 1, wherein at least one of the polyesters constituting the conjugate fiber is a copolymerized polyester, and the copolymerization amount is 5 to 15 mol%. Item 12. The polyester composite fiber according to item 1.