JPH0768657B2 - Polyester stretchable dyed fiber structure and method for producing the same - Google Patents

Description

TECHNICAL FIELD The present invention relates to a polyester-based stretchable dyed fiber structure and a method for producing the same, and more specifically, a polyester having an excellent appearance, vividness and excellent dyeing fastness. Stretchable dyed fiber structure and a method for producing the same.

[Conventional technology]

Conventionally, polyurethane-based elastic fibers are often used as the elastic fibers, but the polyurethane-based elastic fibers have excellent properties in terms of elastic recovery, but have poor hot water resistance and are acidic dyes when mixed with nylon fibers. Is dyed around the boil temperature.

On the other hand, as the elastic fiber, a polyether / polyester block copolymer elastic fiber has come to be used, and a method of mixing it with a polyethylene terephthalate polyester fiber and dyeing with a disperse dye has been proposed (Japanese Patent Publication No. 61-49433).

[Problems to be Solved by the Invention]

However, when the polyurethane elastic fiber and nylon fiber are mixed, there is a problem that the nylon fiber is inferior in dimensional stability and it is difficult to obtain a satisfactory texture. Furthermore, in some applications of sports clothing, lack of sharpness is insufficient. Has been pointed out.

Further, when a combination of polyurethane elastic fiber and nylon fiber is dyed with an acid dye, and when the dye has a large amount of dyeing on nylon, and conversely the amount of dyeing on polyurethane elastic fiber is small, it is dyed. It has a drawback that the aesthetic property is significantly impaired when the fabric is stretched.

On the other hand, the polyether / polyester block copolymer elastic fibers have better wet heat resistance than polyurethane elastic fibers, and can be mixed with polyester fibers for high temperature / high pressure dyeing.

However, since this type of elastic fiber does not have an ionic dyeing seat, it is not dyed with an ionic dye, but is usually dyed with a disperse dye.

When a fiber structure in which an elastic fiber of this type and a polyester fiber are mixed is dyed with a disperse dye, the elastic fiber is easily dyeable to the disperse dye, for example, dyes in a temperature range of 60 to 100 ° C., and is polyester. The degree of dyeing is larger than that of the system fiber, the wet fastness of the dyed fiber structure is inferior, and the dyeing concentration that can be practically used depends on the type of the disperse dye or the mixing ratio of the fiber structure, but is 0.2% by weight. %, And it is possible to dye extremely light colors, but there is a problem that it is impossible to dye medium to dark colors.

In addition, this type of elastic fiber generally has large photodegradation and oxidative deterioration similarly to polyurethane-based elastic fiber, and when it is irradiated with light for a long time or immersed in chlorine water, its elastic property deteriorates, and ski pants There is a problem that it is difficult to use for a long time in such a field requiring light resistance or in a field requiring chlorine resistance such as a swimsuit.

Therefore, the object of the present invention is to solve the problems of the prior art, stretchable dyed fiber structure excellent in aesthetics, sharpness, dyeing fastness, and further excellent in light resistance and chlorine resistance. And to provide a manufacturing method thereof.

[Means for Solving the Problems]

The present invention is a polyester-based stretchable dyed fiber obtained by dyeing a fiber structure obtained by mixing a cationic dye-dyeable polyethylene terephthalate-based polyester fiber and a cationic dye-dyeable polyether / polyester block copolymer elastic fiber with a cationic dye. In the structure, the apparent dyeing degree La of the cationic dye-dyeable polyethylene terephthalate-based polyester fiber and the apparent dyeing degree Lb of the cationic dye-dyeable polyether / polyester block copolymer elastic fiber are as follows: A polyester stretchable dyed fiber structure characterized by satisfying the formula (I).

| La−Lb | ≦ 35 (I) (In the formula, La is the L value of the polyethylene terephthalate polyester fiber dyeable with a cationic dye, which is measured by the CIE colorimetric system, and Lb is the CIE colorimetric system. The L value of the cationic dye-dyeable polyether / polyester block copolymer elastic fiber is measured by.) Furthermore, the present invention is a cationic dye-dyeable polyethylene terephthalate-based polyester fiber and a cationic dye-dyeable polyether / polyester block. A fiber structure containing a mixture of a copolymer elastic fiber and a 2- (3-t-butyl-5-methyl-2-hydroxyphenyl) -5-chlorobenzotriazole and / or 2- (3,5-di- The t-butyl-2-hydroxyphenyl) -5-chlorobenzotriazole and the hindered phenol compound are each contained in the fiber structure in an amount of 0.1 to 4% by weight (owf). A method for producing a polyester-based stretchable dyed fiber structure, characterized by staining with the added cationic dye dyebath.

The elastic fiber used in the present invention is polyether.
Polyester block copolymer elastic fiber, particularly dicarboxylic acid mainly containing terephthalic acid and / or its ester-forming derivative (component A), sulfonic acid represented by the following general formula (II) and / or (III) Salts (B component), (In the formula, Z ₁ aromatic group or aliphatic group, A ₁ is an ester-forming functional group, A ₂ is the same or different from A _{1 an} ester-forming functional group or a hydrogen atom, R ₁ , R ₂ , R ₃ and R ₄ represent the same or different groups selected from the group consisting of alkyl groups and aryl groups, and n represents a positive integer.) (In the formula, Z ₂ is an aromatic group or an aliphatic group, A ₃ is an ester-forming functional group, A ₄ is an ester-forming functional group which is the same as or different from A ₃ , or a hydrogen atom, and X is a metal atom. , N represents a positive integer.) Glycol mainly containing 1,4-butanediol and / or its ester-forming derivative (C component), and polyoxyalkylene glycol having an average molecular weight of about 400 to 6,000 (D component). It is preferable that the block copolymer is a block copolymer containing

Examples of the dicarboxylic acid mainly containing terephthalic acid and / or its ester-forming derivative (component A) include, in addition to terephthalic acid, for example, isophthalic acid, naphthalenedicarboxylic acid, diphenyldicarboxylic acid, diphenoxyethanedicarboxylic acid, β-hydroxyl. Aromatic, aliphatic or alicyclic bifunctional carboxylic acids such as ethoxybenzoic acid, p-oxybenzoic acid, adipic acid, sebacic acid and 1,4-cyclohexanedicarboxylic acid and their lower ones having 1 to 4 carbon atoms. Examples thereof include dialkyl ester and phenyl ester.

Specific examples of the sulfonates (B component) include 3,5
-Dicarboxybenzenesulfonic acid tetrabutylphosphonium salt, 3,5-dicarboxybenzenesulfonic acid ethyltributylphosphonium salt, 3,5-dicarboxybenzenesulfonic acid benzyltributylphosphonium salt, 3,
5-Dicarboxybenzenesulfonic acid phenyltributylphosphonium salt, 3,5-dicarboxybenzenesulfonic acid tetraphenylphosphonium salt, 3,5-dicarboxybenzenesulfonic acid ethyl triphenylphosphonium salt, 3,5-dicarboxybenzenesulfonic acid Butyltriphenylphosphonium salt, 3,5-dicarboxybenzenesulfonic acid benzyltriphenylphosphonium salt, 3,5
-Di (β-hydroxyethoxycarbonyl) benzenesulfonic acid tetraphenylphosphonium salt, 3- (β-hydroxyethoxycarbonyl) benzenesulfonic acid tetrabutylphosphonium salt, 3- (β-hydroxyethoxycarbonyl) benzenesulfonic acid tetraphenylphosphonium salt , 4-hydroxyethoxybenzenesulfonic acid tetrabutylphosphonium salt, 2,6-dicarboxynaphthalene-4-sulfonic acid tetrabutylphosphonium salt, α-tetrabutylphosphonium sulfosuccinic acid, dimethylisophthalate-S-sulfonic acid sodium salt, etc. Can be mentioned. The sulfonates may be used alone or in combination of two or more.

Specific examples of the glycol mainly containing 1,4-butanediol and / or its ester-forming derivative (component C) include 1,4-butanediol, ethylene glycol, 1,3-propanediol, and triglyceride. Mention may be made of ethylene glycol, 1,4-cyclohexanedimethanol and their esters.

Polyoxyalkylene glycol (D component) having an average molecular weight of about 400 to 6,000 includes polyethylene glycol,
Examples thereof include polypropylene glycol, polytetramethylene glycol and copolymers thereof.

In this case, the copolymerization amount of the sulfonates (component B) needs to be 0.2 to 10 mol% with respect to the entire copolymer. When the copolymerization amount of the component B is less than 0.2 mol%, the degree of dyeing with the cationic dye is low and the desired good aesthetic properties cannot be obtained. On the other hand, if the content of the component B exceeds 10 mol%, the elastic properties are deteriorated during dry heat treatment and wet heat treatment, which is not preferable.

The cationic dye-dyeable polyethylene terephthalate-based polyester fiber used in the present invention is obtained by copolymerizing 1 to 5 mol% of the sulfonates (component B) represented by the general formula (II) and / or (III). Is preferred.

If the copolymerization amount of the sulfonates (component B) is less than 1 mol%, the degree of dyeing of the cationic dye will be low, which is not practical. On the other hand, if it exceeds 5 mol%, the dyeing density of the cationic dye dyeing product becomes saturated and the strength of the fiber is deteriorated by the dyeing treatment, resulting in deterioration of the physical properties of the fiber structure, which is not preferable.

As specific compounds of the sulfonates, the compounds used as the component (B) may be the same or different, and these may be used alone or in combination of two or more.

The fibrous structure in the present invention includes non-woven fabrics, woven and knitted fabrics and the like in any form, and uses a mixture of cationic dye-dyeable polyethylene terephthalate-based polyester fibers and cationic dye-dyeable polyether / polyester block copolymer elastic fibers. It is formed by As a mixing method, for example, a yarn in which elastic fibers are coated with polyester fibers is used, and the yarn alone or a polyester fiber yarn can be formed into a woven or knitted fabric.

As a method of coating the elastic fiber with the polyester fiber,
There are a method of covering with a twisted yarn using a hollow spindle, a method of twisting and aligning drawn yarns and covering with a difference in elongation of both fibers, and a method using a spinning machine and a core span. Further, the elastic fiber may be used as a bare thread and may be interwoven with the polyester fiber thread.

The elastic fibers used in the bare thread are often knitted,
Either a warp knit or a circular knit can be used.

A usual method is used for dyeing a fiber structure obtained by mixing a cationic dye-dyeable polyethylene terephthalate-based polyester fiber and a cationic dye-dyeable polyether / polyester block copolymer elastic fiber with a cationic dye. That is, the dyeing temperature is within the range of 80 to 135 ° C,
The temperature is preferably 100 to 130 ° C., and it is desirable to add Glauber's salt to the dyeing bath in an amount of about 2 to 3 g / in order to prevent the strength deterioration of the elastic fiber and the polyester fiber. Washing after dyeing in a light color can be omitted, but as a washing method after dark dyeing, a usual method for washing a cationic dye is used. It is particularly preferable to wash with an aqueous solution of a formalin condensate of acetic acid and / or alkylarisulfonate at a temperature of 60 to 90 ° C.

In the polyester stretchable dyed fiber structure dyed in this way, the apparent dyeing La of the cationic dye dyeable polyethylene terephthalate polyester fiber and the cationic dye dyeable polyether / polyester block copolymer elastic fiber apparent dyeing degree Lb And must satisfy the relationship | La−Lb | ≦ 35. Here, the apparent dyeing degrees La and Lb are L measured by the CIE colorimetric system, respectively.
It is a value, and the lower the value is, the darker the color is.

In order to satisfy this relationship, the copolymerization amount of sulfonates in both fibers may be adjusted appropriately. When | La−Lb | exceeds 35, irritability occurs when the dyed fiber structure is stretched, resulting in poor aesthetics.

In the fiber structure dyed with the cationic dye in this way, both the elastic fiber and the polyester fiber are bonded to the cationic dye by an ionic bond, and the cationic dye is often clearer than the acid dye and the disperse dye. For this reason, it is clear and has excellent dyeing wet fastness, and since the apparent dyeing degree of the elastic fiber and the polyester fiber is regulated within a specific range, the appearance and aesthetics are excellent.

Further, in the present invention, when dyeing a fiber structure in which a cationic dye-dyeable polyethylene terephthalate-based polyester fiber and a cationic dye-dyeable polyether / polyester block copolymer elastic fiber are mixed with a cationic dye, 2- (3) -T-Butyl-5-methyl-2-hydroxyphenyl) -5-chlorobenzotriazole and / or 2- (3,5-di-t-butyl-2-hydroxyphenyl) -5-chlorobenzotriazole and hindered Dyeing with a dye bath in which 0.1 to 4% by weight (owf) of the phenolic compound is added to the fiber structure can prevent the elastic fiber from being deteriorated by light and chlorine.

Examples of the hindered phenol compound used here include octadecyl-3- (3,5-di-t-butyl-4-hydroxyphenyl) propionate and 4,4′-
Thiobis (3-methyl-6-t-butylphenol),
2,2'-methylenebis- (4-methyl-6-t-butylphenol), N, N'-hexamethylenebis (3,5-di-
t-butyl-4-hydroxy-hydrocinnamide),
3,5-di-t-butyl-4-hydroxy-benzylphosphonate-diethyl ester, 1,3,5-trimethyl-2,
4,6-Tris- (3,5-di-t-butyl-4-hydroxybenzyl) benzene, tris (2-methyl-4-hydroxy-5-t-butylphenyl) butane, tris (3,5
-Di-t-butyl-4-hydroxybenzyl) isocyanurate and the like, and particularly preferably 1,3,5
-Trimethyl-2,4,6-tris- (3,5-di-t-butyl-4-hydroxybenzyl) benzene, tris (2-methyl-4-hydroxy-5-t-butylphenyl) butane, tris ( 3,5-di-t-butyl-4-hydroxybenzyl) isocyanurate.

As described above, by using the specific benzotriazole-based compound and the hindered phenol-based compound in combination, not only the light deterioration resistance but also the chlorine resistance deterioration is significantly improved,
The elasticity of the elastic fiber is maintained for a long period of time.

[Action]

The present invention is a mixture of a polyether / polyester block copolymer elastic fiber improved in heat resistance of a conventional polyurethane elastic fiber into a cationic dye dyeable type and a cationic dye dyeable polyethylene terephthalate polyester fiber. Stretch-dyed fiber structure that is excellent not only in aesthetics and sharpness but also in dyeing wet fastness by dyeing the formed fiber structure with a cationic dye and controlling the apparent dyeing density of both fibers within a specific range. Is what you get.

Further, in this dyeing, by adding a specific benzotriazole-based compound and a hindered phenol-based compound together to the dyeing bath, not only the light resistance but also the chlorine resistance is significantly improved.

〔Example〕

 Hereinafter, the present invention will be described in more detail with reference to Examples.

In addition, the part in an Example shows a weight standard.

In the following Examples and Comparative Examples, the L value was measured by Macbeth TYPE 2020 (Morbogen Company, USA) with a D65 light source, and the wet fastness was measured by the AATCC II-A method. is there.

Furthermore, the aesthetics is a visual judgment of the degree of irritability at 100% elongation.

Furthermore, the resistance to light deterioration was measured when the dyed fabric was faded at 63 ° C for 120 hours in a stretched state of 30%, and the number of elastic fiber cuts in the 30x stereoscopic microscope field (diameter 6 mm circle) was 0. The ∘ mark, the 1 to 4 cases were the Δ mark, and the cases of 5 or more were the X mark.

In addition, the chlorine deterioration resistance is 30% stereoscopic field of view after dipping for 96 hours at 24 ° C in chlorine water with effective chlorine adjusted to 300ppm in hypochlorous acid soda with the dyed fabric stretched 30%. The number of cut points of the elastic fiber in 6 mm circle) is 0, the case of 1 to 4 is Δ, the case of 5 or more is x.

Examples 1 to 4 and Comparative Examples 1 to 4 167.3 parts of dimethyl terephthalate, 105 parts of tetramethylene glycol, 275 parts of polytetramethylene glycol having a number average molecular weight of 2,000, and 0.2 parts of tetrabutyl titanate were charged in a reactor at an internal temperature of 190 ° C. A transesterification reaction was performed.
When about 70% by weight of theoretical amount of methanol was distilled, the first
The sulfonates shown in the table were added, the internal temperature was raised to 200 to 240 ° C., and the reaction was performed under a weak vacuum for 60 minutes and then under a high vacuum for 200 minutes.

The produced cationic dye-dyeable polyether / polyester block copolymer is pelletized, the pellets are dried and then melted at 250 ° C., and extruded with a cap having a 6-hole nozzle to obtain 40 denier / 6 filament elastic yarn. Obtained.

On the other hand, 100 parts of dimethyl terephthalate, 60 parts of ethylene glycol, 0.03 part of manganese acetate hydrate (0.024 part to dimethyl terephthalate) and sulfonates of Table 1 were charged to dimethyl terephthalate in an ester exchange can under a nitrogen gas atmosphere. 140 ° C to 220 ° C over 3 hours
The transesterification reaction was carried out while evaporating the methanol produced by heating to the outside of the system.

The product obtained subsequently contained 56% of orthophosphoric acid as a stabilizer.
Aqueous solution 0.03 parts (0.033 parts for dimethyl terephthalate)
(Mol%) was added, and at the same time, excessive temperature rise of ethylene glycol was started. After 10 minutes, 0.04 part of antimony trioxide as a polycondensation catalyst (based on dimethyl terephthalate)
0.027 mol%) was added. When the internal temperature reached 240 ° C, the purging of ethylene glycol was completed, and the reaction product was transferred to the polymerization vessel. Then, the temperature was raised and the reaction was carried out at atmospheric pressure until the internal temperature reached 260 ° C, then 760 mmHg for 1 hour.
To 1 mmHg and reduce the internal temperature to 2 at the same time over 1 hour and 30 minutes.
The temperature was raised to 80 ° C. Polymerization temperature 280 ℃ under reduced pressure of 1mmHg or less
When the polymerization was continued for 2 hours, the vacuum was broken with nitrogen gas to terminate the polymerization reaction, and the polymer was transferred at 280 ° C. under the pressure of nitrogen gas.

This polymer was melt-spun at 290 ° C., the discharge amount was adjusted so that the single yarn fineness of the spun yarn after stretching was about 3 denier, and the breaking elongation was 30%, and the polymer was collected at 1,000 m / min. Then, stretched at a preheating temperature of 80 ° C. at a stretch ratio at which the breaking elongation is 30%,
Heat setting was performed at 130 ° C. to obtain a polyester fiber having 150 denier / 72 filaments.

The elastic yarn as the core yarn, using the polyester fiber as the sheath yarn, the warp density 240 using the jingle-covered yarn,
A plain weave with a weft density of 200 was woven.

After refining the fabric by a conventional method, performing a relax preset, after dyeing with a cationic dye under the following conditions,
Washing was carried out with acetic acid 0.2 g / 80 ° C. for 15 minutes.

Cationic dye: Cathilon Back CD-BLH (Hodogaya Chemical Co., Ltd.)
Manufactured); 7% owf acetic acid; 0.3 g / anhydrous mirabilite; 3 g / bath ratio; 1:30 temperature; 130 ° C. time; 45 minutes In Comparative Examples 3 and 4, after dyeing with a disperse dye under the following conditions, Reductive washing with hydrosulfite (2 g /) and sodium hydroxide (2 g /) at 80 ° C. for 20 minutes was performed.

Disperse dye: Dianix Black HG-FS (manufactured by Mitsubishi Kasei); 12%
owf acetic acid; 0.2 g / anhydrous Glauber's salt; 3 g / bath ratio; 1:30 temperature; 135 ° C time; 45 minutes The results are shown in Table 1.

Examples 5-8 and Comparative Examples 5-8 In Example 1, the sulfonates of the elastic yarn polymer component and the polyester fiber polymer component and their copolymerization amounts were changed as shown in Table 2, and other conditions were changed. A plain weave was woven in the same manner as in Example 1.

This woven fabric is subjected to refining and relaxing preset by a conventional method, and dyeing is performed under the following conditions, and then 0.2 g of acetic acid /
It was washed at 80 ° C for 15 minutes.

The addition of the benzotriazole compound and / or the hindered phenol compound to the dye bath was changed as shown in Table 2.

Cationic dye: Aizen Cathilon Blue CD-BLH (manufactured by Hodogaya Chemical Co., Ltd.); 2.0% owf acetic acid; 0.3 g / anhydrous mirabilite; 3 g / benzotriazole compound; 2% owf hindered phenolic compound; 2% owf bath ratio 1:30 temperature; 130 ° C. time; 45 minutes However, Comparative Examples 7 and 8 were dyed with a disperse dye under the following conditions, and the addition of a benzotriazole compound and / or a hindered phenol compound to the dye bath was Second
It was as shown in the table.

Disperse dye: Dianix Red UN-SE (manufactured by Mitsubishi Kasei Co., Ltd.); 1% owf acetic acid; 0.2 g / anhydrous sodium sulfate; 3 g / benzotriazole compound; 2% owf hindered phenolic compound; 2% owf bath ratio; 1:30 Temperature; 130 ℃ Time; 45 minutes The results are shown in Table 2.

[Effects of the Invention] According to the present invention, a polyester stretchable dyed fiber structure excellent in appearance, aesthetics, sharpness, and dyeing wet fastness can be obtained, and further, a polyester-based stretched dye-resistant fiber structure with less deterioration by light and chlorine. A stretchable dyed fiber structure can be provided.

Continuation of the front page (51) Int.Cl. ⁶ Identification number Office reference number FI Technical display location D02G 3/32 D03D 15/08 D06P 3/52 (56) Reference JP-A-48-10346 (JP, A) JP-A-56-118911 (JP, A) JP-A-63-75133 (JP, A) JP-A-56-20675 (JP, A) JP-A-56-96966 (JP, A)

Claims (7)

[Claims] 1. A polyester-based stretchable dyeing obtained by dyeing a fiber structure containing a mixture of a cationic dye-dyeable polyethylene terephthalate polyester fiber and a cationic dye-dyeable polyether / polyester block copolymer elastic fiber with a cationic dye. A fiber structure, wherein the apparent dyeing degree La of the cationic dye-dyeable polyethylene terephthalate-based polyester fiber and the apparent dyeing degree Lb of the cationic dye-dyeable polyether / polyester block copolymer elastic fiber are as follows: A polyester stretchable dyed fiber structure characterized by satisfying the formula (I). | La−Lb | ≦ 35 (I) (In the formula, La is the L value of the polyethylene terephthalate polyester fiber dyeable with a cationic dye, which is measured by the CIE colorimetric system, and Lb is the CIE colorimetric system. It represents the L value of the cationic dye dyeable polyether / polyester block copolymer elastic fiber measured by. 2. A cationic dye-dyeable polyether / polyester block copolymer elastic fiber comprising a dicarboxylic acid mainly containing terephthalic acid and / or an ester-forming derivative thereof (component A), the following general formula (II) and / or Alternatively, a sulfonate represented by (III) (component B), (In the formula, Z ₁ is an aromatic group or an aliphatic group, A ₁ is an ester-forming functional group, A ₂ is the same or different from A _{1 an} ester-forming functional group or a hydrogen atom, R ₁ , R ₂ , R ₃ , and R ₄
Are the same or different groups selected from the group consisting of alkyl groups and aryl groups, and n represents a positive integer. ) (In the formula, Z ₂ is an aromatic group or an aliphatic group, A ₃ is an ester-forming functional group, A ₄ is an ester-forming functional group which is the same as or different from A ₃ , or a hydrogen atom, and X is a metal atom. , N represents a positive integer.) Clycol mainly containing 1,4-butanediol and / or its ester-forming derivative (C component), and polyoxyalkylene glycol having an average molecular weight of about 400 to 6,000 (D component). The polyester-based stretchable dyed fiber structure according to claim 1, wherein the copolymerization amount of the sulfonates (component B) is 0.2 to 10 mol% with respect to the entire copolymer. 3. A polyethylene terephthalate-based polyester fiber dyeable with a cationic dye comprises a copolymer containing the sulfonate according to claim 2, and the copolymerization amount of the sulfonate with respect to the entire copolymer is 1 to The polyester stretchable dyed fiber structure according to claim 1, which is 5 mol%. 4. A fiber structure comprising a mixture of a cationic dye-dyeable polyethylene terephthalate-based polyester fiber and a cationic dye-dyeable polyether / polyester block copolymer elastic fiber is prepared from 2- (3-t-butyl-5-methyl). −
2-hydroxyphenyl) -5-chlorobenzotriazole and / or 2- (3,5-di-t-butyl-2-
Polyester stretchable dyeing characterized by dyeing with a cationic dye dyeing bath in which 0.1 to 4% by weight (owf) of the hydroxyphenyl) -5-chlorobenzotriazole and the hindered phenolic compound are added to the fiber structure. A method for manufacturing a fiber structure. 5. The polyester-based stretchable dyeing according to claim 4, wherein the cationic dye-dyeable polyether / polyester copolymer elastic fiber is the cationic dye-dyeable polyether / polyester copolymer elastic fiber. A method for manufacturing a fiber structure. 6. The method for producing a polyester-based stretchable dyed fiber structure according to claim 4, wherein the cationic dye-dyeable polyethylene terephthalate-based polyester fiber is the cationic dye-dyeable polyethylene terephthalate-based polyester fiber. 7. A hindered phenol compound is 1,3,5.
-Trimethyl-2,4,6-tris (3,5-t-butyl-4-
Selected from the group consisting of hydroxybenzyl) benzene, tris- (2-methyl-4-hydroxy-5-t-butylphenyl) butane and tris- (3,5-di-t-butyl-4-hydroxybenzyl) isocyanurate. The method for producing a polyester stretchable dyed fiber structure according to claim 4, wherein the polyester-based stretchable dyed fiber structure is one or more compounds.