JP3266222B2 - Polyester coated elastic yarn - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a coated elastic yarn comprising an elastic yarn coated with a normal pressure cationic dye dyeable polyester fiber. The present invention relates to a coated elastic yarn which does not deteriorate in function and has excellent coloring properties.

[0002]

2. Description of the Related Art A coated elastic yarn comprising a polyurethane elastic yarn or the like as a core yarn and a nylon multifilament yarn such as nylon 6 or nylon 66 or a textured yarn (hereinafter simply referred to as a processed yarn) coated around the core yarn. It is known and widely used in socks, pantyhose and ski wear, swimwear and the like. In recent years, a coated elastic yarn obtained by coating a polyester multifilament yarn or its processed yarn around the polyurethane elastic yarn has been used for stretch wear and the like.

[0003] However, coated elastic yarns using nylon multifilament yarns or processed yarns as the coated yarns have the problems that they tend to wrinkle when used in woven fabrics and have poor dimensional stability in the wet state. Also,
When a conventional polyester multifilament yarn or its processed yarn is used, a decrease in dimensional stability at the time of wetting can be avoided, but at the time of dyeing, it cannot be dyed unless under high temperature and high pressure of 120 ° C to 130 ° C. The elasticity of the polyurethane elastic yarn of the core yarn is reduced, and the disperse dye used for dyeing the polyester multifilament yarn in the surface layer is absorbed by the core yarn. There was a problem that the coated yarn was contaminated by the sublimation of the dye absorbed by the yarn. Also, in fields where clear colors are required, such as sportswear, conventional polyester use has not been very satisfactory.

[0004] When a polyester multifilament yarn obtained by copolymerizing pentasodium sulfoisophthalic acid is used as the coated polyester multifilament yarn, it is easily dyed by cationic dyeing, and the above-mentioned sublimation contamination does not occur. High-pressure cationic dyeable type copolymerized with an appropriate amount of pentasodium sulfoisophthalic acid reduces the elasticity of polyurethane-based yarn used as a core yarn, and is not suitable for high-pressure dyeing of wool or the like as a woven or knitted fabric. However, there was a disadvantage that cross-weaving and knitting could not be performed.

Further, an atmospheric pressure cationic dyeable type is known in which a coated polyester multifilament yarn is copolymerized with pentasodium sulfoisophthalic acid and an ethyleneoxyside adduct of neopentyl glycol in an appropriate amount. The elasticity of the polyurethane-based elastic yarn used as the core yarn can be prevented from lowering, and cross-weaving and cross-knitting with a material that is not suitable for high-pressure dyeing such as wool can be performed.On the other hand, since the polymer physical properties are not strong, fine denier, It is not possible to manufacture fine single yarn denier or multifilament yarn with a specific cross section (specifically, 2 denier or less) and the fiber strength is low, so the filament breaks during the post-processing false twisting process or the covering or weaving knitting means as a coating means. There is a problem that fluff is generated and yarn breakage increases, and the productivity is reduced. Was Tsu.

[0006]

The object of the present invention is to reduce the physical properties of the above-mentioned polyurethane-based elastic yarn, and to provide a coated yarn with excellent color clarity, easy covering, dyeing, and post-processing such as weaving and knitting. Excellent dimensional stability and texture,
An object of the present invention is to provide a coated elastic yarn suitable for various uses such as pantyhose, mouth rubber, swimwear, and ski wear.

[0007]

The present invention employs the following means to solve the above-mentioned problems. That is, the present invention is a coated elastic yarn in which an elastic yarn is used as a core yarn and a normal pressure cationic dye-dyeable polyester fiber is used as a coated yarn, and the coated yarn comprises a polyester having a monomer having a metal sulfonate group. The single yarn denier composed of a copolymerized polyester containing 2 mol% or more based on the dicarboxylic acid component is 2.5%.
A polyester-coated elastic yarn, which is a fiber having a denier of not more than 1, and a fiber property of the fiber after normal pressure cationic dyeing satisfies the following expression (1).

(Equation 2) However, in Equation 2, DT indicates the breaking strength of the fiber.
8 g / d or more, and DE indicates the elongation at break of the fiber.
5% or more.

Hereinafter, the present invention will be described in detail. The elastic fiber used in the present invention is preferably a polyurethane elastic fiber generally called a spandex fiber, but may be another kind of elastic fiber. Further, the normal pressure cationic dye dyeable polyester fiber used as the coated yarn of the present invention,
It is called a polyester fiber that can be dyed with a cationic dye at a temperature of 100 ° C. or less. In order for the fiber to exhibit excellent easy dyeability and high fiber strength, the 5-metal sulfoisophthalic acid or an ester-forming derivative thereof is used in an amount of 0.5 to 5.
0 mol% is preferable, and the sulfonate compound represented by the formula (1) is present in an amount of 0.
It is preferably present in an amount of 1 to 3.0 mol%.
The glycol component represented by 1.0 to 1.0 of the glycol component
Desirably, 6.0 mol% is present. If the 5-metal sulfoisophthalic acid or its ester-forming derivative is less than 0.5 mol% of the dicarboxylic acid component, the dyeability of the cationic dye becomes low, and conversely, 5.0 mol% of the dicarboxylic acid component.
If the amount is larger, the polymerization degree of the melt viscosity that can be spun by the ordinary method not only does not provide the physical properties of the intended fiber, but also deteriorates the operability during molding such as spinning and lowers the melting point of the polyester, and This is not preferred because the properties and hydrolysis resistance are reduced.

In the present invention, if the amount of the sulfonate compound represented by the formula (1) is less than 0.1 mol% based on the carboxylic acid component, the effect of improving the stretchability becomes small, and the fiber having the desired physical properties cannot be obtained. Conversely, if the amount is more than 3.0 mol% with respect to the dicarboxylic acid component, the polymerization degree of the polyester in the step of the polycondensation reaction reaches an extremely low level, which is not preferable. On the other hand, if the glycol represented by Chemical Formula 2 is less than 1.0 mol% of the glycol component, the effect of easy dyeing is reduced, and the desired fiber dyeability cannot be obtained. Conversely, if the amount of the glycol component is more than 6.0 mol%, the melting point, light resistance and hydrolysis of the polyester are undesirably reduced. In the present invention, when the amounts of the respective components are within the above-mentioned preferred ranges, the balance between practical fiber properties and normal pressure cationic dyeability can be satisfied for the first time. The more preferred amount of these components is 5-
The metal sulfoisophthalic acid or its ester-forming derivative is 1.0 to 2.0 mol% of the dicarboxylic acid component, and the sulfonate compound of the formula 1 is 0.5 to 2.0 mol% based on the dicarboxylic acid component. The glycol represented by 2 is 2.0 to 4.5 mol% of the glycol component. In addition,
In Chemical Formula 1, A is an ester-forming functional group, Ring B is phenyl or naphthyl, R ⁴ is an aliphatic hydrocarbon group having 1 to 20 carbon atoms, an alicyclic hydrocarbon group having 3 to 20 carbon atoms or 6 to 6 carbon atoms. 18 is an aromatic hydrocarbon group, M is an alkali metal or alkaline earth metal, and P and q are 0 or 1. In the chemical formula 2, R6 is a terephthalic acid residue or 95.
0 to 99.5 mol% are terephthalic acid residues,
~ 5.0 mol% is 5-methorium sulfoisophthalic acid residues. m and n are the same or different integers and 3 ≦ m + n
≦ 10.

[0010]

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[0011]

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The coated elastic yarn shown in the present invention has an elastic yarn as a core yarn, and a single yarn denier having a DT of 3.8 g / d or more and a DE of 25% or more is 2.5 denier or less. When the DT is less than 3.8 g / d or the DE is less than 25%, fuzzing occurs in a post-process such as false twisting and a coating process. Thread breakage increases. If the single yarn denier exceeds 2.5 denier, it is not preferable because the quality and feel of the woven or knitted fabric, which are the products required, are reduced. In the present invention, when the physical properties of each of the fibers are in the above-mentioned preferable ranges, the coated elastic yarn of the present invention can be obtained for the first time. In addition, the physical properties of these fibers were such that DT was 4.0 g.
/ D or DE is preferably 30% or more. Also, the single yarn denier is preferably 2.0 denier or less.

[0013] The normal pressure cationic dye dyeable polyester fiber may be a filament yarn or a spun yarn. However, in consideration of pantyhose or its mouth rubber, swimwear, ski wear, etc., the filament yarn is preferably used. Is preferred. Further, the normal pressure cationic dye dyeable polyester fiber may be a hollow fiber, and its cross-sectional shape may be circular, triangular, or any other shape. The multi-filament yarn may be any of unprocessed so-called flat yarn or textured yarn such as false twisted yarn.

The coated elastic yarn referred to in the present invention is a polyurethane elastic fiber in which a polyurethane elastic fiber constitutes a core portion in a relaxed state, and a normal pressure cationic dye-dyeable polyester fiber as a coating yarn constitutes a core portion. Means all the yarns covering the fiber, a method of coating with a twisting yarn using a covering twisting machine or a knitting yarn machine, entanglement of polyurethane elastic fiber and normal pressure cationic dye dyeable polyester fiber using high pressure air A coated elastic yarn obtained by a method of opening a normal pressure cationic dye dyeable polyester fiber by static electricity or electrification and supplying a polyurethane fiber at the time of opening to composite.

Among the means for coating the polyester-coated elastic yarn, a covering method, in particular, a normal pressure cationic dye dyeable polyester fiber as a coating yarn is wrapped around a polyurethane-based elastic yarn as a core yarn. So-called single covering yarns are preferred. A double wrapped yarn with a double wrapping makes the texture of the woven product hard. Furthermore, it is effective to improve the abrasion resistance by setting the number of twists T of the covering in the single covering yarn to the condition shown by the following equation (3). In Equation 3, D ₁ is a core yarn polyurethane-based elastic fiber denier, D ₂
Is the fiber denier of the sheath yarn, and DF is the elastic fiber elongation at the time of covering.

[0016]

(Equation 3)

It is preferable that the covering yarn formed by the covering step is heat set. This is because, in the case of a single covering yarn, the residual torque of the covering yarn can be reduced by heat setting, and the structure as the covering yarn can be firm. As a means of this heat setting, a method of heat setting with a heater on the machine while covering, a method of heat setting the completed cheese with a key set, or a method of key setting with the completed covering yarn as a skein Either may be used.

[0018]

In the present invention, since the normal pressure cationic dye dyeable polyester fiber is used for the coated yarn of the coated elastic yarn, the physical properties of the polyurethane-based elastic yarn used for the core after dyeing are not reduced. Since the coated yarn is dyeable with a cationic dye, the woven or knitted fabric using the coated elastic yarn is more excellent in sharp color development than the conventional type dyeable with a disperse dye. Further, the normal pressure cationic dye type polyester fiber which is a coated yarn is a copolymerized polyester containing a monomer having a metal sulfonate group in an amount of 2 mol% or more based on a dicarboxylic acid component constituting the polyester, so that the fiber properties are low. It is excellent, and it can be made fine denier and irregular cross section.

Here, the fiber properties of the normal pressure cationic dye type polyester fiber which is the coated yarn need to have physical properties shown by the following equation (4). The DT shown by the equation 4 is 3.8
When the ratio is less than g / d and the DE is less than 25%, covering and weaving in a false twisting step and a coating step, which are subsequent steps,
The generation of fluff and yarn breakage due to filament breakage in the knitting process increases, the productivity decreases, and the durability of the resulting product also deteriorates. And the dimensional stability at the time of heating decreases, and the object of the present invention cannot be achieved.

[0020]

(Equation 4)

On the other hand, if the single yarn denier exceeds 2.5 denier, the quality and feel of the woven or knitted product, which is the desired product, will be reduced, and the object of the present invention cannot be achieved. In Equation 4, DT × DE1 /
If 2 is less than 19, the sheath tends to break during use of the product, while if it exceeds 30, it is not preferable because it has a hard feeling.

[0022]

EXAMPLES The present invention will be described in more detail with reference to the following Examples, in which parts mean parts by weight. In addition, the measuring method of the characteristic value in an Example is as follows. Melting point of polyester: Measured by DSC under a condition of a temperature of 20 ° C./min in a nitrogen atmosphere with a sample amount of 10 mg. Intrinsic viscosity (IV) of polyester: Measured at 30 ° C. with a mixed solution of phenol / tetrachloroethane (6: 4 weight ratio). DT, DE: Using a Tensilon UTM-4L type tensile tester (manufactured by Toyo Baldwin Co., Ltd.), gauge length 200 mm, initial load 1/30 g / d, elongation speed 2
The sample was stretched at 00 mm, and the breaking strength (g / d) and breaking elongation (%) of the fiber were determined and calculated from the SS curve drawn at a recording speed of 500 mm / min. Dyeing rate of cationic dye showing dyeability (easiness of dyeing) ([(XY) / X] ×
100, X: absorbance of the staining solution before staining, Y: absorbance of the staining solution after staining) is preferably 60% or more in the present invention. If it is less than this value, it is difficult to obtain a sufficiently dark color, which is not desirable. In the present invention, examples of the atmospheric pressure cationic dyeing include dyeing under the following conditions. Staining conditions: (a) Dye and concentration …… Diacryl Br. Blue H2R-N
(10% owf) (b) Auxiliary agent and concentration ……… CH3COONa (0.2g / 1), CH3C
OOH (0.2g / 1) (c) Bath ratio ……………… 1: 100 (d) Dyeing temperature and time… Normal pressure boiling temperature (98 ° C) ×
90 minutes

Example 1 A normal pressure cationic dye dyeable polyester fiber of the present invention was produced as follows. R is a 2.2-dimethylpropylene group in 1000 parts of dimethyl terephthalate (DMT), 1.3 mol% of 5-sodium sulfoisophthalic acid dimethyl ester (DSN), 700 parts of ethylene glycol, and glycol represented by the formula (2). , 4.2 mol% of a glycol having a value of m + n of 4 was placed in a transesterification reactor, into which 0.33 part of zinc acetate dihydrate (0.030 mol% based on DMT + DSN) and 0.39 part of antimony trioxide were added. (0.025 mol% based on DMT + DSN) and sodium acetate as a diethylene glycol growth inhibitor, 5 mol% based on the monomer containing a metal sulfonate, and from 140 ° C to 230 ° C over 3 hours under a nitrogen gas atmosphere. As the temperature rises,
The transesterification reaction was performed while distilling off the by-product methanol out of the system. 0.026 parts of trimethyl phosphate (0.36 mol% based on DMT + DSN) was added to the reaction system,
Stir for 15 minutes. The obtained product is transferred to a polycondensation can previously heated to 230 ° C., 1.3 mol% of m-sodium sulfobenzoic acid (SBA) is added as a 20% by weight solution of ethylene glycol, and the mixture is added under normal pressure and nitrogen gas atmosphere. After stirring for 20 minutes, the temperature of the system was gradually reduced to 0.1 mmHg while the internal temperature was raised to 230 to 275 ° C for 60 minutes.
A polycondensation reaction was performed at 75 ° C. and 0.1 mmHg until the viscosity of the produced polymer reached 3400 poise to obtain a copolyester having a predetermined composition. Each of the obtained polymers was dried by a conventional method, and the spinning temperature of an extrusion-type spinning machine was set to 28.
Melt spinning was performed at 5 ° C. and a winding speed of 600 m / min. The obtained undrawn yarn is subjected to a drawing heat treatment using a heating roller of 85 ° C. and a hot plate of 150 ° C. at a draw ratio at which the elongation of the finally obtained drawn yarn is 35%, and the normal pressure cation is obtained. A bright fiber (A) having a round cross section of dyeable polyester 50 denier 24 filaments was obtained.

Comparative Example 1 As a comparative example, in the same manner as that obtained in Example 1, the normal pressure cationic dye dyeable polyester fiber contained 2.6 mol% of DSN.
Except that SBA was not added, the same method as that described in Example 1 was used to obtain bright fibers having a round cross section of 50 denier 24 filaments. Table 1 shows the physical properties of the above polyester fibers.

[0025]

[Table 1]

A false twisting treatment was performed, and a double covering elastic yarn was produced by using the obtained false twisted yarn as a sheath yarn and 280 denier spandex fiber (polyurethane-based elastic fiber yarn) as a core yarn. That is, while drafting the spandex fiber 5.9 times, the above false twisted yarn is wound on the lower yarn at a rate of 1128 turns / M in the S direction and on the upper thread at a rate of 745 turns / M in the Z direction. Wearing. The obtained covering yarn was used and knitted in the rubber portion of a sock, dyed with a cationic dyeable dye at normal pressure, and commercialized. Table 1
As shown in the above, the normal pressure cationic dye dyeable polyester fiber of the embodiment of the present invention has much less thread breakage in the false twisting step and the covering step than in the comparative example, and is used for the sock mouth rubber. As a result of a wearing test, the durability was fairly good. On the other hand, in the comparative example, yarn breakage occurred frequently in the false twisting step and the covering step, resulting in poor productivity and unsuitable for industrial production. In addition, the products used as the mouth rubber of the socks also had poor durability in the wearing test, that is, there were many drawbacks such as the spuntex fiber which is the core yarn was abraded quickly as it was used. .

[0027]

According to the present invention, a normal pressure cationic dye dyeable polyester fiber is used as the covering yarn of the covering elastic yarn having the elastic yarn as the core yarn as described above, and the covering yarn has a single yarn denier of 2%. 0.5 denier or less, and the breaking strength is 3.8 g / d or more and the breaking strength is 25% or more in the fiber properties after normal pressure cationic dyeing. The woven or knitted fabric obtained by using the coated elastic yarn of the present invention is less likely to cause yarn breakage and fluff, and has excellent durability and good dimensional stability when wet and when heated. In addition, since it can be dyed with a normal pressure cationic dye dyeable dye, it can be dyed at a low temperature of 90 to 100 ° C., so that there is no occurrence of sublimation contamination and the elasticity of the elastic fiber yarn as the core yarn is prevented from lowering. You. Therefore, by using this coated elastic yarn, the elastic properties, dimensional stability and color development are good and wrinkles are hardly generated, and it is a good knitting and weaving for pantyhose, socks, mouth rubber, swimwear, ski wear and other various stretches. The land is easily obtained.

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-4-361637 (JP, A) JP-A-50-118047 (JP, A) JP-A-61-222732 (JP, A) JP-A-58-1983 13736 (JP, A) JP-A-59-30926 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) D02G 3/36 D02G 3/32 D01F 6/62 D01F 6/84

Claims (1)

(57) [Claims] 1. A coated elastic yarn in which an elastic yarn is used as a core yarn and a normal pressure cationic dye dyeable polyester fiber is used as a coating yarn, wherein the coating yarn comprises a polyester having a monomer having a metal sulfonate group. 1.5 relative to the dicarboxylic acid component
A polyester coated elastic fiber comprising a copolyester containing at least mol% and having a single-fiber fineness of 2.5 denier or less, and having a fiber property after normal pressure cationic dyeing satisfying the following expression (1). yarn. (Equation 1) However, in Equation 1, DT indicates the breaking strength of the fiber.
8 g / d or more, and DE indicates the elongation at break of the fiber.
5% or more.