JPH09324346A - Blended dyed fabric product comprising polyester fiber and stretch fiber - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a blended dyed fabric product comprising polyester fibers and polyurethane fibers, excellent in color developability, color fastness, elasticity characteristics, stretch/shrinkage recovery, etc. SOLUTION: In this blended dyed fabric product comprising polyester fibers and polyurethane fibers, the polyester fibers consist of a modified polyethylene terephthalate copolymerized with 1.5-4.5wt.% of polyethylene glycol 500-4,000 in average molecular weight and 9-6wt.% of adipic acrid, with the weight ratio of the adipic acid to polyethylene glycol being 1.3-6 and the peak temperature of the dissipation factor at 90-105 deg.C.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fabric dyeing product in which polyester fibers and stretch fibers are mixed. More specifically, the present invention relates to a blended fabric dyed product of stretch fibers which shows excellent elastic properties without causing strength deterioration of the stretch fibers at the dyeing stage by using a polyester fiber mixture which can be dyed under atmospheric pressure at a temperature of 95 ° C. or less. It is a thing.

[0002]

2. Description of the Related Art In recent years, various performances have been demanded for clothing fibers, and it has become difficult to satisfy the demands with a single fiber. Under such circumstances, expectations for composite materials have increased significantly. For example, polyamide fibers are mixed with stretch fibers typified by polyurethane fibers because of their soft texture and dyeability under atmospheric pressure, and are applied to sports knits, foundations for women's innerwear, swimwear, socks and the like.

However, polyamide fibers are easily yellowed under the influence of gas and light. When covered, the force of tightening the stretch fiber is weak, so that the yarn is likely to shift. There are drawbacks such as poor dimensional stability and morphological stability. Therefore, in order to eliminate the above-mentioned drawbacks, a mixture of polyester fibers and stretch fibers has come to be used.

If polyester fibers are used instead of polyamide fibers, the above problems associated with polyamide fibers can be solved, but problems with dyeability are newly caused. That is, there arises a problem that the dyeing temperature of the polyester fiber is high. Since polyester fibers have low dyeability, they are usually dyed under high pressure at a temperature of about 130 ° C. High-pressure dyeing is required for dyeing a mixed color of polyester fiber and polyurethane fiber in a dark color, but under these temperature conditions, the polyurethane fiber undergoes thermal deterioration and causes a significant decrease in strength and yellowing. Problems arise. If the polyester fiber is dyed at a normal pressure of 100 ° C. or less in order to avoid thermal deterioration, it cannot be dyed in a dark color because the conventional polyester fiber has poor dyeability.

Therefore, as a technique for improving the dyeability of polyester fibers with disperse dyes, studies have been made to lower the dyeing temperature at the time of dyeing polyester fibers with disperse dyes by modifying the polymer and improving the dyeing method and post-treatment method. Came. In order to dye polyurethane fibers without heat deterioration, the dyeing temperature required for polyester fibers is generally 95 ° C. or lower.

As a method for modifying the raw material polymer,
A polyoxyalkylene glycol represented by polyoxyethylene glycol was copolymerized. Polyester fiber produced by high-speed spinning method (Japanese Patent Publication No. 60-15725),
Polyester fiber obtained by copolymerizing glycol such as tetramethylene glycol and 1,4-cyclohexanediol (JP-A-58-120815) and 2,2-bis [4- (2-hydroethoxy) phenyl] propane. The polyester fiber produced by the high-speed spinning method (Japanese Patent Laid-Open No. 59-199814) and the polyester fiber produced by the ordinary method in which 6 to 10% by weight of polyethylene glycol are copolymerized (Japanese Laid-Open Patent Publication Nos. 3-40880 and 3-174).
No. 076) is known. However, although the polyester fibers obtained by these methods have improved dyeability, they do not have dyeability at 95 ° C., and when they are copolymerized with a large amount of polyethylene glycol, they have the drawbacks of poor light resistance. Also, an easily dyeable polyester fiber prepared by a conventional method, which is obtained by copolymerizing a polyol, an aliphatic carboxylic acid, and an aromatic dicarboxylic acid, is known (JP-A-51-1303).
20 and JP-A-57-30169). For example, polyester fibers obtained by copolymerizing aliphatic dicarboxylic acids such as polyalkylene oxide and azelaic acid, and aromatic dicarboxylic acids such as isophthalic acid and 1,2-bis (phenoxy) ethane-4,4-dicarboxylic acid at 95 ° C. To make it dyeable, the copolymerization ratio must be 15% by weight or more. Such polyester fiber reduces the strength of the raw yarn,
There were problems such as a decrease in whiteness of the yarn, a decrease in spinnability, and hardening of the yarn at the time of heat setting, which was not satisfactory. Carbon number 8
The above aliphatic dicarboxylic acid was copolymerized. Easily dyeable polyester fibers produced by high-speed spinning are also known (JP-A-5-9).
No. 8512). Although such a polyester fiber has a high dyeability, it has a problem of extremely poor wash fastness. Further, a method is also known in which a metal sulfonate is subjected to high-speed spinning of a copolyester to facilitate dyeing (Japanese Patent Publication No. 60-10126). However, this known fiber has the disadvantage that it has a low strength and, as a result, a low burst strength of the fabric, which makes it substantially unusable for the purposes of the invention. Further, since the polyester obtained by copolymerizing the metal sulfonate contains a large amount of infusible material modified with the metal sulfonate, if the spinning time becomes long, the spinneret pack will be clogged and spinning will be impossible.

Further, there is known a polyester fiber prepared by a conventional method, in which 5-sodium sulfoisophthalic acid and adipic acid are copolymerized in order to enhance the dyeability (Japanese Patent Laid-Open No. 51-51).
-133529, JP-A-55-158325, JP-A-61-239015). However, even such known polyester fibers cannot be used for the purpose of the present application because their dyeability at 95 ° C is insufficient.

As a method for improving the dyeing method and the post-treatment method, for example, carrier dyeing is known. However, since carrier dyeing uses high-boiling organic compounds such as phenol derivatives, aromatic halogen compounds, and biphenyl derivatives in the dye bath, it has a drawback that the waste liquid treatment and workability are significantly deteriorated. Further, a method is known in which polyester fibers obtained by high-speed spinning are subjected to a wet heat treatment at 180 ° C. to 300 ° C. to enhance dyeability (Japanese Patent Laid-Open No. 58-136825 and Japanese Patent Publication No. 63-73650). However, although the moist heat treatment shows an improvement in dyeability, it is poor in level dyeing property, and since the fiber once obtained by the high speed spinning is heat treated again, the advantage of improving the productivity of the high speed spinning is not utilized. It has drawbacks.

As described above, polyester fibers having a high disperse dyeing property at 95 ° C. have not been industrially produced so far. In addition, the known polyester fibers whose dyeability is improved to some extent have problems in fastness and spinnability.

[0010]

SUMMARY OF THE INVENTION An object of the present invention is excellent in colorability, fastness, elastic properties, expansion recovery rate, etc. dyed under normal pressure without causing thermal deterioration of stretch fibers such as polyurethane fibers. The present invention also provides a fabric dyeing product for mixing polyester fibers and polyurethane fibers.

[0011]

As a result of intensive studies, the inventors of the present invention have copolymerized polyethylene glycol and adipic acid with a very limited copolymerization ratio in order to solve the above problems. It has been found that a fiber using polyethylene terephthalate can solve the above problems, and further studies have led to the present invention.

That is, the present invention provides a mixed dyed product of polyester fibers and stretch fibers, wherein the polyester fibers are 1.5 to 4.5% by weight of polyethylene glycol having an average molecular weight of 500 to 4000 and 9 to adipic acid.
6 wt% copolymerized polyethylene terephthalate, satisfying 1.3 ≦ adipic acid weight% / polyethylene glycol weight% ≦ 6, and a loss tangent peak temperature of 9
The present invention provides a mixed fabric dyeing product of polyester fiber and stretch fiber, which has a temperature of 0 to 110 ° C.

The polymer constituting the polyester fiber used in the present invention is polyethylene terephthalate obtained by copolymerizing 1.5 to 4.5% by weight of polyethylene glycol having an average molecular weight of 500 to 4000 and 9 to 6% by weight of adipic acid. , 1.3 ≦ adipic acid weight% / polyethylene glycol weight% ≦ 6, which is a copolyester composed of polyethylene terephthalate. Two copolymerization components of polyethylene glycol and adipic acid are indispensable in order to obtain sufficient dyeability and fastness at least at 98 ° C or lower. Average molecular weight 500-4
000 polyethylene glycol only 1.5-4.5
Polyethylene terephthalate copolymerized by weight% or polyethylene terephthalate copolymerized only by 6 to 9 weight% adipic acid does not show sufficient dyeability at 95 ° C.

Polyethylene glycol used as a copolymerization component is a copolymerization component which is extremely effective in enhancing dyeability. When the average molecular weight is less than 500, since polyethylene glycol having a considerably low molecular weight is contained, it is distilled off under reduced pressure during polymerization under high vacuum, and the amount of polyethylene glycol contained in the obtained polymer is not constant. Therefore, the strength / elongation property, the dyeability, the heat property, etc. of the raw yarn are not uniform, and the product has uneven properties.
On the other hand, when the average molecular weight is more than 4000, the amount of high molecular weight polyethylene glycol that is not copolymerized in the polymer increases, resulting in deterioration of dyeability, light fastness and washing fastness.

Adipic acid used as a copolymerization component contributes to the improvement of dyeability because it causes appropriate disorder of the amorphous structure of the fiber. Of course, an aliphatic dicarboxylic acid component other than adipic acid (having 6 carbon atoms) is also effective as a copolymerization monomer that causes disorder of the amorphous structure and enhances dyeability.
However, when the aliphatic dicarboxylic acid having 5 or less carbon atoms is used, the thermal stability of the polymer is lowered and the whiteness is lowered. Incidentally, the decrease in thermal stability is proportional to the number of moles of the methylene group adjacent to the carboxyl group, so that such a result occurs. On the other hand, when an aliphatic dicarboxylic acid component having a carbon number of 7 or more is used, the disorder of the amorphous portion becomes too large, so that the fastness, particularly the wash fastness is significantly reduced. However, when adipic acid was used, these problems were specifically small. Thus, adipic acid is a very good copolymerization component selected from a very limited and narrow range. The reason for this is not clear, but it can be estimated as follows. That is, adipic acid has four methylene groups, and this length is almost equivalent to the length of the benzene ring of terephthalic acid. Therefore, in the polyester fiber used in the present invention, although the structure of the amorphous part is disturbed by the flexible group, the degree thereof is kept to the minimum necessary, and thus the modified polyester fiber whose thermal characteristics are the closest to those of the polyethylene terephthalate fiber. Becomes

In order to secure sufficient dyeability, fastness and spinning stability at 95 ° C. using a disperse dye, the amount of polyethylene glycol is 1.5 to 4.5% by weight. If the amount of polyethylene glycol is less than 1.5% by weight, the dyeability will be poor. If more than 4.5% by weight,
In addition to poor light fastness, coloration occurs at the polymerization stage of the polymer, and in high vacuum polymerization, bumping and bubbling phenomena become prominent and the polymer becomes difficult to polymerize. The best balance between dyeability, fastness and polymerizability is 2.0
Is about 4.0% by weight.

On the other hand, the optimum amount of adipic acid varies depending on the amount of polyethylene glycol, but is 9 to 6% by weight. If the amount of adipic acid is less than 6% by weight, the dyeability at 95 ° C will be insufficient. On the other hand, when it exceeds 9% by weight, the heat resistance is lowered and only a fabric having a hard texture can be obtained. Practicality is not achieved unless a copolymerization ratio having a good balance between dyeability and fastness and good thermal stability and spinning stability is selected. In order to enhance the dyeability, it is better to copolymerize as much polyethylene glycol as possible. However, when the amount of polyethylene glycol is large, the light fastness is significantly reduced and also the wash fastness is reduced. Therefore, instead of increasing the amount of polyethylene glycol, by copolymerizing an appropriate amount of adipic acid, it is possible to suppress light fastness and washing fastness. In order to have such a copolymer composition, it is necessary to satisfy 1.3 ≦ weight% of adipic acid / weight% of polyethylene glycol (hereinafter, this value is referred to as R value) ≦ 6. However, even if this composition is satisfied, the texture of the obtained mixed fabric product tends to become hard when the value of the weight% of the R value becomes large. To make the texture soft, this value is 4 or less,
It is desirable to select 3 or less.

In the polyester fiber used in the present invention, the content is within 10% by weight, preferably 5% by weight.
Within the range, other diol, oxycarboxylic acid, or other copolymerizable component capable of forming a polyester may be contained. However, in this case, it is necessary that the copolymerization component does not cause deterioration in fastness. In addition, various additives,
For example, a matting agent, a heat stabilizer, a defoaming agent, a color-adjusting agent, a flame retardant, an antioxidant, an ultraviolet absorber, an infrared absorber, a crystal nucleating agent, a fluorescent whitening agent, etc. are copolymerized as necessary, Alternatively, they may be mixed.

The polymer constituting the polyester fiber used in the present invention is, for example, in the case of adipic acid as it is in the case of polyethylene glycol as it is in an arbitrary stage before the completion of polycondensation in a general production process of polyethylene terephthalate. , As it is, or as monomethyl ester, dimethyl ester, diethyl ester,
It can be produced by adding a lower alkyl ester such as bis (oxyethyl) ester to the reaction system and copolymerizing. At that time, these copolymerization components,
Alternatively, it can be added after being dispersed, dissolved, or heat-treated in a suitable solvent such as ethylene glycol.

In the polyester fiber used in the present invention, the peak temperature of loss tangent determined by dynamic viscoelasticity measurement is 9
It is necessary to be 0 to 110 ° C. This is because the dyeability required by the present invention can be secured within this range. Since the peak temperature of the loss tangent corresponds to the molecular density of the amorphous portion, the smaller this species, the easier the dye is to enter the amorphous portion. That is, it can be said that the dyeability is increased. In the case of the present invention, if the temperature exceeds 110 ° C, the effect of improving the dyeability is small, and dyeing at a higher temperature is required, which is not preferable. However, it is not necessarily low, and when it is too low, there are problems that the elongation is too large, the texture is deteriorated due to curing during heat setting, and the washing fastness is deteriorated. The temperature is practically 90 to 110 ° C., but preferably 100 to 10
8 ° C.

The melting point of the polyester fiber used in the present invention is 230 to 245 ° C. If the melting point is less than 230 ° C., the polyester fiber is subjected to thermal denaturation during normal processing and use, and its physical properties change. There is no problem even if the melting point is 250 ° C. or higher, but in the copolymer composition of the present invention, it is 24
It is difficult to achieve a melting point above 5 ° C. The polyester fiber used in the present invention has a winding speed of 1500 m /
The unstretched yarn can be obtained by a normal method of stretching the unstretched yarn at a rate of about 2 to 3.5 times or a direct rolling method in which the spinning-spreading process is directly connected. This is not a preferable spinning method, because the high-speed spinning method with a winding speed of 5000 m / min or more can be used, but the orientation of the amorphous portion becomes too low and the fastness is lowered. Spinning conditions are not particularly limited, and spinning can be performed under known conditions.

The stretch fiber used in the present invention is not particularly limited, and is represented by dry-spun or melt-spun polyurethane fiber, polybutylene terephthalate fiber and polytetramethylene glycol ether copolymerized polybutylene terephthalate fiber. Examples include polyester elastic yarns. In the mixed cloth used in the present invention, the content of polyester fibers is preferably about 60 to 98%. When the content of the ester fiber is more than 70%, the expansion and contraction properties are suppressed, so that it can be used for outerwear, casual wear and the like. When it is less than 70%, it can be used for innerwear, foundation, swimwear and the like due to its stretching property.

The mixed fabric dyed product of the present invention includes wool,
A small amount of cotton, silk, rayon, cuprammonium rayon, polyamide fiber, polyacrylic fiber or the like may be mixed.
In this case, physical properties peculiar to the mixed fibers can be added. In the present invention, the mixed form of the polyester fiber and the polyurethane fiber is not particularly limited, but the polyurethane fiber is used as it is, or the form of the coated yarn in which the polyester fiber is wound around the polyurethane fiber is preferable. Further, as another mixed form, there is a method of twisting, plying, entanglement, weaving, knitting, which increases the dispersibility of polyester fibers and stretch fibers, and improves the color developability, texture, and functional surface. preferable. The fabric form of the mixed fabric of the present invention is not particularly limited, and in addition to knits and woven fabrics,
Nonwoven fabrics are also included.

The knitted fabric of the present invention is knitted, woven, relaxed and refined, and dyed. Also, if necessary, alkali reduction treatment is performed after relaxing refining and before dyeing. Refining 60 ~
It is preferable to relax as much as possible at a temperature of 98 ° C., since the stretch recovery of the fabric is enhanced. Dyeing is performed using a disperse dye at a temperature of 95 ° C. or lower without using a carrier. In addition, it is preferable to perform dry heat setting at a temperature of 140 to 190 ° C. for those whose forms are fixed before and after dyeing.

[0025]

EXAMPLES Hereinafter, the present invention will be described in more detail with reference to Examples, but it is needless to say that the present invention is not limited only to Examples. The main measured values in the examples were measured by the following methods. (1) Loss tangent A loss tangent (tan δ) at each temperature, and dynamics, using a Orientec Rheovibron in dry air at a sample weight of about 0.1 mg, a measurement frequency of 110 Hz, and a temperature rising rate of 5 ° C / min. The elastic modulus was measured. From the result, the loss tangent −
Obtain the temperature curve and find the loss tangent peak temperature Tm on this curve.
The ax (° C) was determined. Temperature rising rate 5 ℃ / min, measurement frequency 1
Obtained at 10 Hz. (2) Exhaust rate of polyester fiber, measurement of bathochromicity (K / S) (evaluation of dyeability) A sample of a single knitted fabric of polyester fiber was used, and hot water containing score roll 400 at 2 g / was used. ℃, 20 minutes refining treatment, dried in a tumbler dryer, then
The thing which carried out heat setting of 180 degreeC and 30 second using the pin tenter was used. The exhaustion rate was evaluated by the exhaustion rate after the temperature was raised from 40 ° C. to 95 ° C. and further held for 1 hour. The dye is Kayaron Polyester Blue 3RSF
(Manufactured by Nippon Kayaku Co., Ltd.) was used and dyed at 6% owf and a bath ratio of 1:50. As the dispersant, 0.5 g / liter of Nikkasan Salt 7000 (manufactured by Nika Kagaku Co., Ltd.) is used, and 0.25 ml of acetic acid is used.
PH / liter and sodium acetate 1 g / liter, pH
Was adjusted to 5.

The exhaustion rate was determined by calculating the absorbance A of the stock dye solution and the absorbance a of the dye solution after dyeing with a spectrophotometer and substituting them into the following formula. Absorbance is the maximum absorption wavelength of the dye 5
The value at 80 nm was adopted. Exhaust rate = (A−a) / A × 100 (%) The degree of dyeing, which expresses how deeply the color was dyed, was evaluated using K / S. This value is measured by measuring the spectral reflectance R of the sample cloth after dyeing, and the Kubelker Munk (Kub) shown below is used.
Elka-Munk) equation. The larger this value, the greater the bathochromic effect, that is, the better the color is developed. For R, the value at 580 nm, which is the maximum absorption wavelength of the dye, was adopted.

K / S = (1-R) ² / 2R (3) Expansion and recovery rate A test piece adjusted to have a width of 2.5 cm and a length of 16 cm was attached to a tensile tester with a chuck distance of 10 cm, and an elongation rate of 80%.
The elongation recovery curve up to was drawn, the residual elongation (L ') was read, and it was determined according to the following formula. Here, L was 80%.

Elongation recovery rate = (L−L ′) × 100 / L (4) Dyeing fastness Washing fastness is JIS-L-0844, light fastness JI
SL-0842 was performed accordingly. <Example 1> 1070 parts of dimethyl terephthalate, 720 parts of ethylene glycol, dimethyl adipate (hereinafter referred to as D
(Abbreviated as MA) 82.4 parts, and manganese acetate tetrahydrate 0.5 part as a transesterification catalyst are charged, and the temperature is 150 ° C.
To 240 ° C., the transesterification reaction was carried out for 3 hours while distilling out methanol. Then, polybutylene glycol having an average molecular weight of 1000 (hereinafter referred to as P
Abbreviated as EG1000) 47.6 parts, as a stabilizer,
0.7 part of trimethyl phosphate, 0.5 part of antimony trioxide as a polycondensation catalyst and 0.5 part of titanium dioxide as a matting agent were added, and prepolymerization was carried out for 50 minutes. The pressure is gradually reduced, and finally 0.5 Torr
At 275 ° C. for 2 hours and 40 minutes, ηsp / c =
0.80 modified polyester was obtained in chip form. The composition of the polymer thus obtained is
The EG was 4% by weight and the DMA was 7% by weight.

The obtained polymer chip was heated at 130 ° C. for 1 hour.
After drying under a nitrogen stream of 00 L / min for 20 hours, 3
Spinning temperature 270 using a spinneret with 6 Y-section holes
An undrawn yarn was prepared at a spinning temperature of 1,500 m / min.
Then, the obtained undrawn yarn is hot roll 80 ° C., hot plate 160 ° C., draw ratio 2.8 times, draw speed 80
The yarn was twisted at 0 m / min to obtain a 50/36 drawn yarn.
The strength was 4.5 g / d, the elongation was 38%, and the Tmax was 99 ° C.

The dyeability of the polyester fiber of the present invention depends on the polybutylene terephthalate fiber (Tm
ax: 136 ° C) with a blue disperse dye at 130 ° C, 60
It can be evaluated by comparing with the dyeability of the minute. In this case, K
Comparing with / S is preferable because the color density can be directly compared. Kayaron polyester blue 3RSF as dye
(Manufactured by Nippon Kayaku Co., Ltd.), 6% owf, bath ratio 1:50
When dyed with, the exhaustion rate of the polybutylene terephthalate fiber by the conventional method at 130 ° C. for 60 minutes is 9
2%, K / S was 21.4. The polyester fiber obtained in this example had an exhaustion rate of the disperse dye at 95 ° C. for 60 minutes of 92% and a K / S of 21.6. This result shows that the dyeability of the polyester fiber at 95% for 60 minutes is equivalent to the dyeability of the polybutylene terephthalate fiber by the conventional method at 130 ° C. for 60 minutes.

A warp knitted fabric was prepared using the obtained atmospheric dyeable yarn and a 210 denier polyurethane stretch fiber Leuka (manufactured by Asahi Kasei Kogyo). In this case, the gauge is 28G,
The loop length is 1080mm / 480 course of atmospheric dyeable yarn,
The stretch fiber was 112 mm / 480 courses, and the driving density was 90 courses / inch. The mixing ratio of the atmospheric dyeable yarn was set to 75.5%.

The obtained raw machine was subjected to relax refining at 90 ° C. for 2 minutes, and set at 160 ° C. for 1 minute by dry heat. Danix Black BG-FS (manufactured by Dyster Japan) 8% owf, Nikkasan Salt 1200 which is a dyeing aid
Was adjusted to pH 6 with acetic acid in the presence of 0.5 g / liter, and dyeing was carried out at a bath ratio of 1:30 at 95 ° C. for 60 minutes. The obtained dyed product had a black lightness L value of 12.3, indicating sufficient color development. The elastic recovery rate was 95.3%, the washing fastness was grade 5, and the light fastness was grade 4. In addition, it was soft and taut, and had a chewy texture.

<Examples 2 to 4> Example 1 was repeated while changing the copolymer composition. In all cases, good dyeability, color development, fastness and stretch recovery properties were exhibited. In addition, it was soft and taut, and had a chewy texture. <Example 5> The molecular weight of polyethylene glycol was 200.
Example 1 was repeated substituting 0, 3000, 4000. The properties of the dyed product obtained were almost the same as in Example 1. In any case, the black lightness L value is 12.3 to 12.
4, which was a sufficient color development. Expansion recovery rate is about 95
%, The washing fastness was grade 5, and the light fastness was grade 4. In addition, it was soft and taut, and had a chewy texture.

Comparative Example 1 For comparison, a warp knitted fabric of polybutylene terephthalate fiber spun by a conventional method and a leucer was prepared in the same manner as in Example 1 and dyed at 95 ° C. for 60 minutes. . The L value of the obtained dyed product is 18.3,
The color development of black was insufficient. On the other hand, 130 ° C,
When dyed for 60 minutes, the L value was 12.4, which was a sufficiently black color, but the burst strength was reduced to ⅔ of the raw fabric. Further, the elongation recovery rate was lowered to 65%.

<Examples 2 to 5> Polymerization / spinning experiments were conducted in the same manner as in Example 1 except that the copolymer composition was variously changed. Polymerization and spinning proceeded extremely smoothly. Table 1 summarizes the results. All modified polyester fibers showed good dyeability and fastness. In addition, all of them showed a soft, firm and chewy texture.

<Comparative Examples 2 to 5> Various dyed products were prepared in the same manner as in Example 1 except that the copolymer composition was changed. The results are shown in [Table 1] in comparison with Example 1.

[0037]

[Table 1]

If it exceeds the range of the present invention, the dyeability,
It can be seen that the robustness is insufficient. Further, Comparative Example 4 had a firm texture. In Comparative Examples 2 and 5, bumping sometimes occurred in the high vacuum state during polymer polymerization, and the phenomenon in which the contents of the kettle were transferred to the vacuum line was observed. When the bumping was severe, I had to disassemble and clean the device. The obtained polymer was also yellowed.

[0039]

The mixed fabric dyeing product of the present invention has a dyeing property,
Atmospheric pressure dyeable polyester fiber having excellent fastness is used, and it is possible to dye a dark color at a temperature of 95 ° C or lower. Therefore, since the polyurethane fiber is not deteriorated by heat, it exhibits excellent elastic properties and elastic recovery rate, and is used in sports knits, foundations for women's innerwear, swimwear,
Very useful for socks and other applications.

Claims (1)

[Claims] 1. A mixed dyed product of polyester fiber and stretch fiber, wherein the polyester fiber is polyethylene glycol having an average molecular weight of 500 to 4000.
A polyethylene terephthalate copolymerized with 5 to 4.5% by weight and 9 to 6% by weight of adipic acid, wherein 1.3 ≦ adipic acid weight% / polyethylene glycol weight% ≦ 6.
And a loss tangent peak temperature of 90 to 105 ° C., which is a cloth dyeing product for mixing polyester fibers and stretch fibers.