JPH0770859A - Conjugated yarn - Google Patents

Abstract

PURPOSE:To obtain a conjugated yarn excellent in initial handle, capable of recovering initial handle even after long-term wearing and capable of eliminating the crease produced by wearing and washing. CONSTITUTION:This conjugated yarn is obtained by winding a yarn consisting of filament or short fiber having no shape memorizing ability and used as a sheath yarn around a yarn consisting of a copolyester having 10-80 deg.C glass transition temperature and >=150 deg.C melting point and having shape memorizing ability and used as a core yarn.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a composite yarn suitable for a woven or knitted fabric, which has an excellent initial texture and can recover the initial texture even after being worn for a long time.

[0002]

2. Description of the Related Art Polyester fibers represented by polyethylene terephthalate have various excellent properties and are widely used as clothing fibers. However, although a garment made of polyester fiber has an excellent texture immediately after production, there is a problem that the initial texture is lost during long-term wearing.

As an attempt to solve this problem, fibers made of polyester having a shape memory capacity have been proposed.
(JP-A-2-269735, JP-A-3-279416, JP-A-4-122712
No. 5-93331, etc.). However, since the polyester fiber having a shape memory ability is a fiber made of copolyester, there is a problem that the initial texture is inferior to that of a normal polyester fiber.

[0004] In order to improve the initial texture of the polyester fiber having a shape memory ability, it has been proposed to use a mixed fiber (Japanese Patent Laid-Open No. 171536/1993), but it has not reached the stage of being sufficiently satisfied.

[0005]

DISCLOSURE OF THE INVENTION The present invention has a good initial texture, can recover the initial texture even after long-term wearing, and can eliminate wrinkles caused by wearing or washing. The present invention aims to provide a yarn suitable for a woven or knitted fabric that can be obtained.

[0006]

The present invention achieves the above-mentioned object, and the summary thereof is as follows. A core yarn is a yarn made of copolyester having a shape-memory ability with a glass transition temperature of 10 to 80 ° C and a melting point of 150 ° C or higher, and a yarn made of long fibers or short fibers having no shape-memory ability around the sheath is sheathed. It is coated as a thread and the core component and the sheath component are in a weight ratio of 2
/ 8 to 8/2, a composite yarn.

The present invention will be described in detail below. The shape memory ability referred to in the present invention means molding into an arbitrary shape A,
The shape A is a function of fixedly storing it by heat treatment, then once deformed to a shape B different from the shape A by external force, and then heated to a temperature higher than the glass transition temperature to recover the shape A.

The composite yarn of the present invention exhibits fixability when the temperature is lower than the glass transition temperature of the copolyester of the core yarn, and exhibits recoverability when heated to a temperature higher than the glass transition temperature. It is a thing.

The core yarn constituting the composite yarn of the present invention needs to be made of a copolyester having a shape memory capacity that satisfies the following requirements. First, it is necessary that the glass transition temperature is 10 to 80 ° C. If the glass transition temperature is lower than 10 ° C., it is not preferable because the glass transition temperature may be wrapped around the heating roller or the yarn may be fused. If the glass transition temperature exceeds 80 ° C, the temperature required for shape recovery becomes too high, which is not practical. Next, the melting point is 150 ° C
It is necessary to be above. If the melting point is less than 150 ° C, heat setting and high-temperature dyeing during post-processing become difficult, which is not practical.

Such a copolyester is composed mainly of a dicarboxylic acid component composed of two or more dicarboxylic acid components, 70 mol% or more of which is an aromatic dicarboxylic acid component, and one or more aliphatic diol components. There is one that Here, examples of the aromatic dicarboxylic acid component include terephthalic acid, isophthalic acid, 2,6-naphthalenedicarboxylic acid, 1,4-naphthalenedicarboxylic acid, 4,4′-diphenyldicarboxylic acid and diphenoxyethanedicarboxylic acid. Examples of the aliphatic dicarboxylic acid component include succinic acid, adipic acid, suberic acid, azelaic acid, sebacic acid, dodecanedioic acid and the like. On the other hand, examples of the aliphatic diol component include ethylene glycol, 1,3-propanediol, neopentyl glycol and 1,6-hexanediol.

If desired, the copolyester may be copolymerized with an unsaturated dicarboxylic acid having an intermolecular crosslinkable structure, an unsaturated diol, and a tri- or higher functional compound. Further, the copolyester may be copolymerized with an aromatic diol such as bisphenol A or 4,4′-biphenol and other auxiliary raw materials, if necessary, as long as the shape memory ability and the spinnability are not impaired. Good.

The components constituting the copolyester in the present invention and the copolymerization ratio thereof can be selected within a wide range, but from the viewpoints of economical efficiency, versatility, physical properties and the like, terephthalic acid is 70 to 95 mol%, preferably 80 to 93. Most preferred is a copolyester composed of ethylene glycol and a dicarboxylic acid component consisting of 5 to 30 mol% of dodecanedioic acid, preferably 7 to 20 mol%.

The sheath yarn is a polyester yarn such as polyethylene terephthalate, an unfinished yarn of polyamide long filament such as nylon 6, a false twisted yarn or a polyester yarn such as polyethylene terephthalate, a polyamide yarn such as nylon 6,
It can be arbitrarily selected from spun yarns of short fibers such as rayon, acetate, cotton, wool and hemp according to the desired texture.

The composite yarn of the present invention is (a) using a spinning machine,
It can be manufactured by a method of supplying a core thread to the center of the sheath thread or (b) a general method of manufacturing a covering thread, and is appropriately selected according to the fiber used.

The ratio of the core yarn and the sheath yarn is 2/8 by weight.
It is necessary to set the ratio to 8/2, and if this ratio is too small, the recoverability of the texture becomes insufficient, and conversely if it is too large, the texture of the fibers constituting the sheath yarn is not sufficiently exhibited.

The cross-sectional shape of the fiber group constituting the composite yarn of the present invention may be a circular cross-section or a triangular cross-section or the like, and is not particularly limited.

The shape can be fixed by any process from the drawing process and false twisting process during the production of the core yarn to the fabric finishing process, or by making it into clothes and then heat-treating at about 160 ° C.

In order to recover the initial texture lost by wearing for a long period of time and to eliminate the wrinkles generated by wearing or washing, heating at a temperature above the glass transition point of the core yarn and below the shape fixing temperature is used. Good.

[0019]

In the composite yarn of the present invention, a normal fiber yarn is used as a sheath yarn, and a yarn having a shape memory ability is used as a core yarn. Therefore, the sheath yarn has an excellent texture and an excellent recoverability by the core yarn. It is synergistically exhibited, has a good initial texture, and can recover the initial texture even after being worn for a long period of time.

[0020]

EXAMPLES Next, the present invention will be specifically described with reference to examples. The measuring method and the evaluating method are as follows. (1) Intrinsic viscosity [η] An equal weight mixture of phenol and ethane tetrachloride was used as a solvent and measured at a temperature of 20 ° C. (2) Melting point (Tm) and glass transition point (Tg) The melting point (Tm) and the glass transition point (Tg) were measured at a temperature rising rate of 20 ° C / min using a differential scanning calorimeter (DSC-2 type manufactured by Perkin Elmer Co., Ltd.). (3) Evaluation of texture Soft feeling, drapability, and firmness were evaluated by sensory evaluation on an 8-point scale. The case where these are the best was evaluated as the 8th grade, and the worst case was evaluated as the 1st grade (5th grade or more is a pass, 4 grade or less is a failure). (4) Recovery of texture An electric washing machine containing 100 g of cloth, 40 g of neutral detergent and 20 l of water, washing time 5 minutes, dehydration time 1 minute, rinse time 8
After washing for 2 minutes under a condition of dehydration time of 2 minutes, it was naturally dried. Then, heat treatment was performed at 80 ° C. for 5 minutes to recover the texture. After repeating washing and recovery treatment 30 times, the texture was evaluated. (1 decrease in texture before and after washing
Those below grade pass, and those above grade 2 fail. (5) Wrinkle Eliminating Property A cloth was washed, dried, and heat-treated in the same manner as in the test for the recovery of the texture, and the sample was visually evaluated in 5 stages. The best grade was evaluated as 5 grade and the worst grade was evaluated as 1 grade (4 grades or more passed, 3 grades or less failed).

Production Example 1 45.0 kg of bis (β-hydroxyethyl) terephthalate and its oligomer obtained by the esterification reaction of terephthalic acid and ethylene glycol were mixed with 5.8 g of dodecanedioic acid.
kg, ethylene glycol 9.0 kg, and tetrabutyl titanate 26 g as a catalyst are added, and the temperature is 250 ° C and nitrogen gas pressure is 3.6.
The esterification reaction was carried out at kg / cm ² for 2 hours. Transfer the obtained esterification reaction product to a polycondensation reactor,
The polycondensation reaction was carried out for 3 hours in torr to obtain a copolyester (FM-PET) having a copolymerization amount of dodecanedioic acid of 10.1 mol%. The obtained copolyester has Tg = 47 ° C., Tm = 233 ° C., [η]
It was 0.64.

Production Example 2 The procedure of Production Example 1 was repeated except that the addition amount of dodecanedioic acid was changed to 11.6 kg. The copolymerization amount of dodecanedioic acid was 20.0 mol%, Tg = 32 ° C., and Tm = A copolyester (FM2-PET) having a [η] 0.68 at 204 ° C. was obtained.

Production Example 3 The procedure of Production Example 1 was repeated except that the addition amount of dodecanedioic acid was 17.4 kg, and the copolymerization amount of dodecanedioic acid was 29.8 mol%, Tg = 11 ° C., Tm = A copolyester (FM3-PET) having [η] 0.69 at 186 ° C. was obtained.

Production Example 4 The procedure of Production Example 1 was repeated except that the addition amount of todecanedioic acid was changed to 23.2 kg, and the copolymerization amount of dodecanedioic acid was 40 mol%, Tg = -3 ° C., Tm. = 148 ° C, a copolyester (D-PET) having [η] 0.67 was obtained.

Example 1 FM-PET was spun at a spinning temperature of 290 ° C. and a spinning speed of 1400 m / min and wound up, and an undrawn yarn was drawn at a drawing speed of 700 m / min at a heating roller temperature of 80 ° C. Under conditions, it is stretched 3.5 times and wound up, with a circular cross-section fineness of 50d / 12f and elongation of 26
%, A drawn yarn having a boiling water shrinkage of 10% was obtained. Using an ordinary single covering device, the above drawn yarn was used as the core yarn, and the 150th cotton spun yarn was over-fed by 1.5 times to become the sheath yarn, and the FM-PET drawn yarn and the cotton spun yarn were combined. Weight ratio (E / C)
50/50 composite yarn is produced, and then, using this composite yarn, sizing (30 ° C.), drying (85 ° C.), warping, weaving,
Relax scouring was performed with hot water at 97 ° C and final heat fixing at 160 ° C to prepare a twill fabric.

Examples 2 to 3 Example 1 was repeated except that the E / C ratio was changed.
It carried out similarly to.

Examples 4 to 7 The procedure of Example 1 was repeated except that the cotton spun yarn was replaced with the long fiber or short fiber spun yarn shown in Table 2.

Example 8 Example 8 was repeated except that FM2-PET was used instead of FM-PET.

Example 9 The procedure of Example 1 was repeated, except that FM3-PET was used instead of FM-PET.

Comparative Example 1 Example 1 was repeated except that polyethylene terephthalate (PET) was used instead of FM-PET. The obtained woven fabric had a good texture at the beginning, but the texture was deteriorated by the recovery test.

Comparative Examples 2 to 3 Example 1 was repeated except that the E / C ratio was changed.
It carried out similarly to.

Comparative Example 4 The procedure of Example 1 was repeated, except that D-PET was used instead of FM-PET. When the woven fabric was heat-set at 160 ° C., the woven fabric was fused and the texture was hardened, making it unusable for practical use.

The results of Examples 1 to 9 and Comparative Examples 1 to 4 are shown in Table 1.
Described in.

[0034]

[Table 1]

[0035]

EFFECTS OF THE INVENTION According to the present invention, the initial texture is good, the initial texture can be restored even after long-term wearing, and wrinkles caused by wearing or washing can be eliminated. A yarn suitable for a woven or knitted fabric is provided.
Further, the composite yarn of the present invention is excellent in economic efficiency because it can be produced easily and inexpensively with conventional equipment.

Claims (1)

[Claims] 1. A glass transition temperature of 10 to 80 ° C. and a melting point of 150.
A composite yarn in which a yarn made of copolyester having a shape memory ability of ℃ or more is used as a core yarn, and a yarn made of long fibers or short fibers having no shape memory ability is coated as a sheath yarn around the core yarn. A composite yarn, wherein the weight ratio of the yarn to the sheath yarn is 2/8 to 8/2.