JP2009228167A - Spun-like double layered yarn, and fabric using the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a spun-like double layered polyester yarn cationically dyeable under ordinary pressure, and to provide a fabric comprising the same. <P>SOLUTION: The spun-like double layered polyester yarn is such that filament yarns of lower elongation at break form the core, while filament yarns of higher elongation at break are encircled in a twisted-union-yarn form around the core to constitute an outer layer, and at the boundary of the core and the outer layer, respective parts of both kinds of the filament yarns are mutually blended and crossed to form entanglement parts. This spun-like double layered polyester yarn meets the following requirements (a) and (b): (a) The filament yarns of higher elongation at break constituting the outer layer are each a polyester yarn where a main recurring unit is composed of ethylene terephthalate, wherein the polyester is such a copolyester that its acid components include a metal sulfoisophthalate (A) and a specific isophthalic acid compound under specific conditions. (b) The diethylene glycol content of the copolyester is 2.5 wt.% or less. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a spun-like two-layer structure yarn using a normal pressure cationic dyeable polyester yarn that is dyeable to a cationic dye under normal pressure, and a fabric comprising the same.

  Polyester fibers are excellent in mechanical strength, chemical resistance, heat resistance and the like, and are widely used in clothing applications. In recent years, market needs have been diversified, and as a method of imparting a spun-like texture and bulkiness to a polyester fiber such as high-grade wool with such a polyester fiber, in particular, a polyester long fiber, for example, Japanese Patent Publication No. 60-11130 As shown in Japanese Patent Laid-Open No. 8-13275, Japanese Patent Laid-Open No. 2006-169697, etc., a low elongation yarn is formed by combining two or more types of polyester filaments having a difference in elongation, and an outer layer (sheath) yarn, a high elongation It has been proposed to improve bulkiness by using a spun-like false twisted two-layer structure yarn in which the warp yarn constitutes the core yarn. By such a method, a good bulky and spun-like polyester fabric is obtained (see Patent Documents 1 to 3).

However, polyester fibers can only be dyed with disperse dyes and azoic dyes because of their chemical properties, and therefore have a drawback that it is difficult to obtain a clear and deep hue. A method has been proposed in which a metal salt of sulfoisophthalic acid is copolymerized in an amount of 2 to 3 mol% to make it cationically dyeable. (See Patent Documents 4 and 5)
Although it has a good dyeability with a cationic dye, there is a problem that it can be dyed only under high temperature and high pressure.

  In order to make it sufficiently cationic dyeable at normal pressure and at a temperature of around 100 ° C., it is necessary to copolymerize a large amount of the metal salt of sulfoisophthalic acid. The degree of polymerization cannot be increased, the strength of the polyester fiber obtained by melt spinning is significantly reduced, and the process operability of the false twisted two-layer structure yarn is significantly deteriorated.

  On the other hand, a technique for copolymerizing a cationic dyeable monomer having a small ion-binding intermolecular force is disclosed for such problems (see Patent Documents 6 and 7). Examples of cationic dyeable monomers having a small ion-binding intermolecular force include 5-sulfoisophthalic acid tetrabutoxyphosphonate. These cationic dyeable monomer copolyesters have poor thermal stability and are capable of cationic cation. When the amount of copolymerization is increased for the purpose of dyeing, thermal decomposition proceeds in the middle of the polymerization reaction, making it difficult to increase the molecular weight. Furthermore, there is a problem that the decomposition due to the heat history during melt spinning is large, the resulting yarn has weak strength, and the process operability of the false twisted two-layer structure yarn is remarkably deteriorated.

Further, a method of copolymerizing polyethylene glycol having a molecular weight of 2000 or more with a metal salt of sulfoisophthalic acid, a method of copolymerizing a dicarboxylic acid of a linear hydrocarbon such as adipic acid or sebacic acid, or diethylene glycol, neopentyl glycol, cyclohexane di A method for improving the atmospheric pressure cationic dyeability by a method of copolymerizing a glycol component such as methanol has been proposed. (See Patent Documents 8 and 9)
However, the strength of the normal pressure cationic dyeable polyester fiber obtained by melt spinning the polyester obtained by any of these methods is not sufficient, and the process operability of the false twisted two-layer structure yarn is significantly deteriorated. There was a problem that the tear strength was reduced.

Further, a composite fiber has been proposed in which a polyester copolymerized with 5-sodium sulfoisophthalic acid is disposed in a sheath portion and a polyester having 95% by mole or more of ethylene terephthalate repeating units disposed in a core portion (see Patent Document 10). . However, the copolymerization amount of the sulfoisophthalic acid component in the copolymer polyester constituting the sheath part is limited for the same reason as described above, and it is difficult to obtain sufficient cationic dyeing properties. By using fibers, there have been problems such as an increase in processing cost in the spinning process or a restriction on the fiber cross-sectional shape.
In view of the current situation, development of a normal pressure cationic dyeable false twist two-layer structure yarn made of polyester yarn has been highly desired.

Japanese Patent Publication No. 60-11130 JP-A-8-13275 JP 2006-169697 A Japanese Patent Publication No.34-10497 JP-A-62-89725 JP-A-1-162822 JP 2006-176628 A JP 2002-284863 A JP 2006-200064 A Japanese Patent Laid-Open No. 7-126920

  The present invention solves the above-described problems and provides a spun-like polyester two-layer structured yarn capable of cationic dyeing under normal pressure.

In view of the above problems, the present inventors have intensively studied, and as a result, the present invention has been completed, that is, according to the present invention,
It consists of two types of filament yarns with different elongations. The filament yarns with low elongation are arranged in the core part and the filament yarns with high elongation are arranged in an alternating twist around the core part to form the outer layer part. A two-layer structured yarn in which a part of both filament yarns are mixed and crossed at the boundary portion between the core portion and the outer layer portion to form an entangled portion, and the span satisfies the following requirements: Like-like two-layer structure yarn.
a) The filament yarn having a large elongation constituting the outer layer portion is a polyester yarn in which the main repeating unit is composed of ethylene terephthalate, and the polyester is a metal salt of sulfoisophthalic acid (A) in the acid component, And a copolyester containing the compound (B) represented by the following formula (1) under the conditions satisfying the following formulas 1 and 2 simultaneously.
b) The diethylene glycol content in the copolymerized polyester is 2.5% by weight or less.

［上記式中、Ｒは水素または炭素数１〜１０のアルキル基を表し、Ｘは４級ホスホニウム塩、または４級アンモニウム塩を表す。］
３．０≦Ａ＋Ｂ≦５．０ （数式１）
０．２≦Ｂ／（Ａ＋Ｂ）≦０．７ （数式２）
［ここで、Ａはスルホイソフタル酸の金属塩の共重合量（モル％）、Ｂは上記式（１）で表される化合物の共重合量（モル％）を表す。］
により解決される。

[In the above formula, R represents hydrogen or an alkyl group having 1 to 10 carbon atoms, and X represents a quaternary phosphonium salt or a quaternary ammonium salt. ]
3.0 ≦ A + B ≦ 5.0 (Formula 1)
0.2 ≦ B / (A + B) ≦ 0.7 (Formula 2)
Here, A represents the copolymerization amount (mol%) of the metal salt of sulfoisophthalic acid, and B represents the copolymerization amount (mol%) of the compound represented by the above formula (1). ]
It is solved by.

  According to the present invention, when the outer layer yarn of the two-layer structure yarn is a polyester containing a specific cationic dyeable component under specific conditions, the false twisting process stability is remarkably improved, and the yield of atmospheric pressure cationic dyeable span is improved. It can be a like two-layer structured yarn.

Hereinafter, the present invention will be described in detail.
The spun-like two-layer structure yarn in the present invention is composed of a filament yarn having a low elongation and a outer layer portion in which a filament yarn having a higher elongation than the filament yarn surrounds the core portion in an alternating twisted manner. Although it is a two-layer structured yarn, there is a feature in the atmospheric pressure cationic dyeable polyester fiber constituting the outer layer portion, which will be described in detail below.

  The fiber component constituting the outer layer portion of the two-layer structured yarn in the present invention is a polyester mainly composed of ethylene terephthalate obtained by polycondensation reaction of terephthalic acid or an ester-forming derivative thereof and an ethylene glycol component. And containing a metal salt of sulfoisophthalic acid (A) as a copolymerization component and a compound (B) represented by the following formula (1) under the conditions satisfying the following formulas 1 and 2 at the same time: Is a polyester having a diethylene glycol content of 2.5% by weight or less.

［上記式中、Ｒは水素または炭素数１〜１０のアルキル基を表し、Ｘは４級ホスホニウム塩、または４級アンモニウム塩を表す。］
３．０≦Ａ＋Ｂ≦５．０ （数式１）
０．２≦Ｂ／（Ａ＋Ｂ）≦０．７ （数式２）
［ここで、Ａはスルホイソフタル酸の金属塩の共重合量（モル％）、Ｂは上記式１で表される化合物の共重合量（モル％）を表す。］

[In the above formula, R represents hydrogen or an alkyl group having 1 to 10 carbon atoms, and X represents a quaternary phosphonium salt or a quaternary ammonium salt. ]
3.0 ≦ A + B ≦ 5.0 (Formula 1)
0.2 ≦ B / (A + B) ≦ 0.7 (Formula 2)
[Here, A represents the copolymerization amount (mol%) of the metal salt of sulfoisophthalic acid, and B represents the copolymerization amount (mol%) of the compound represented by Formula 1 above. ]

(Description of component A)
Examples of the sulfonic acid group-containing aromatic dicarboxylic acid component used in the atmospheric pressure cationic dyeable polyester of the present invention include 5-sulfoisophthalic acid metal salts (sodium salt, lithium salt, potassium salt), 5-sulfoisophthalic acid. Or a quaternary ammonium salt of 5-sulfoisophthalic acid. These ester-forming derivatives are also preferably exemplified. Among these groups, a metal salt of 5-sulfoisophthalic acid is preferably exemplified from the viewpoint of thermal stability, cost, etc., and in particular, a sodium salt of 5-sulfoisophthalic acid and a dimethyl ester thereof, 5-sulfoisophthalic acid. Particularly preferred is the sodium salt of dimethyl acid.

(Description of component B)
The compound (B) represented by the chemical formula (1) is quaternary phosphonium salt or quaternary ammonium salt of 5-sulfoisophthalic acid or its lower alkyl ester. As the quaternary phosphonium salt, the quaternary ammonium salt is preferably a quaternary phosphonium salt or a quaternary ammonium salt substituted with an alkyl group, a benzyl group or a phenyl group, and particularly preferably a quaternary phosphonium salt. The four substituents may be the same or different. Specific examples of the compound represented by the chemical formula (1) include 5-sulfoisophthalic acid tetrabutylphosphonium salt, 5-sulfoisophthalic acid ethyltributylphosphonium salt, 5-sulfoisophthalic acid benzyltributylphosphonium salt, and 5-sulfoisophthalic acid. Acid phenyltributylphosphonium salt, 5-sulfoisophthalic acid tetraphenylphosphonium salt, 5-sulfoisophthalic acid butyltriphenylphosphonium salt, 5-sulfoisophthalic acid benzyltriphenylphosphonium salt, or dimethyl ester or diethyl ester of these isophthalic acid derivatives Preferably exemplified.

(Explanation of Formula 1)
The total of component A and component B copolymerized with the normal pressure cationic dyeable polyester used in the present invention needs to be within a range of 3.0 to 5.0 mol% based on the acid component. If it is less than 3.0 mol%, sufficient dyeing cannot be obtained by cationic dyeing under normal pressure. On the other hand, if it exceeds 5.0 mol%, the strength of the resulting polyester yarn is lowered, which is not suitable for practical use. Further, since the dye is consumed excessively, it is disadvantageous in terms of cost.

(Explanation of Formula 2)
The component ratio between component A and component B must be such that B / (A + B) is in the range of 0.2 to 0.7. When the ratio is 0.2 or less, that is, in a state where the proportion of component A is large, it is difficult to increase the degree of polymerization of the resulting polyester due to the thickening effect of the metal salt of sulfoisophthalic acid. On the other hand, when the ratio is 0.7 or more, that is, the ratio of the component B is large, the reaction is slow, and when the ratio of the component B is further increased, the decomposition proceeds and the degree of polymerization cannot be increased. Further, when the ratio of component B increases, the thermal stability deteriorates, and the molecular weight decreases due to thermal decomposition when remelted in the melt spinning stage. Therefore, the toughness of the resulting polyester yarn decreases, and fuzz in false twisting This is not preferable because many yarn breaks occur.

(Description of DEG amount)
The diethylene glycol contained in the atmospheric pressure cationic dyeable polyester used in the present invention is preferably 0.3 to 2.5% by weight. When the amount exceeds 2.5% by weight, the process passability is lowered, the yarn is broken frequently, and a sufficient strength cannot be obtained. If it is less than 0.3%, it is practically impossible because the polymer production capacity needs to be extremely small. Preferably it is 0.5 to 2.5 weight%, More preferably, it is 1.0 to 2.0 weight%.

  In order to suppress the amount of DEG within the above range, at least one kind of alkali metal salt, alkaline earth metal salt, tetraalkylphosphonium hydroxide, tetraalkylammonium hydroxide, trialkylamine, etc., is used as a DEG inhibitor. In addition, it is preferable to add about 1 to 20 mol% with respect to the cationic dyeable monomer to be used (in the case of the present invention, the compounds (A) and (B)).

(Manufacture of atmospheric pressure cationic dyeable polyester)
The production of the normal pressure cationic dyeable polyester used in the present invention is not particularly limited, and a conventionally known polyester production method is used. That is, a low polymer is produced by a direct polycondensation reaction between terephthalic acid and ethylene glycol, or an ester exchange reaction between an ester-forming derivative of terephthalic acid typified by dimethyl terephthalate and ethylene glycol. Subsequently, this reactive organism is produced by heating under reduced pressure in the presence of a polycondensation catalyst to carry out a polycondensation reaction until a predetermined polymerization degree is reached. As a method for copolymerizing an aromatic dicarboxylic acid containing sulfoisophthalic acid and / or an ester derivative thereof, a generally known production method can be used.

(Other additives)
Further, the atmospheric pressure cationic dyeable polyester used in the present invention may contain a small amount of additives such as antioxidants, fluorescent whitening agents, antistatic agents, antibacterial agents, ultraviolet absorbers, and light stabilizers as necessary. , A heat stabilizer, a light-shielding agent or a matting agent may be contained. In particular, antioxidants and matting agents are particularly preferably added.

(Outer layer yarn production method)
The polyester obtained as described above is produced by a known method. For example, the obtained normal pressure cationic dyeable polyester is extruded into a fiber form in a molten state, melt-spun at a speed of 500 to 3500 m / min, drawn and heat treated, and melted at a speed of 1000 to 5000 m / min. A method of spinning and stretching is preferably exemplified by a method in which melt spinning is performed at a high speed of 5000 m / min or more, and a stretching process is omitted depending on applications.
The elongation of the normal pressure cationic dyeable polyester fiber of the outer layer yarn is preferably 45% or more. If it is less than 45%, the bulkiness of the two-layer structured yarn cannot be obtained, which is not preferable.

The single fiber fineness of the outer layer yarn of the present invention is preferably 4 dtex or less. When it exceeds 4 dtex, it is difficult to obtain a core-sheath structure at the time of fiber mixing. On the other hand, the lower limit of the single fiber fineness is not particularly limited, but is preferably 0.1 dtex or more from the viewpoint that fibers can be formed practically and the wear resistance of the fabric is not significantly impaired.
The cross-sectional shape of the normal pressure cationic dyeable polyester fiber of the outer layer portion yarn of the present invention can be any shape depending on the application, for example, in addition to a circle, such as a triangle, a flat shape, a star shape, a V shape, etc. An irregular cross section or a hollow cross section thereof can be exemplified.

(Core yarn)
Next, as a core yarn of the two-layer structure yarn of the present invention, a polyester fiber is preferable, and an elongation of 25% or less is preferable. If it exceeds 25%, the bulkiness of the two-structure yarn cannot be obtained, which is not preferable.

(Method for producing two-layer structured yarn)
In order to obtain a two-layer structure yarn having good bulkiness, the difference in elongation between the core yarn and the outer layer yarn is preferably 20% or more. If the difference in elongation is less than 20%, the bulkiness is lowered, which is not preferable.
In order to obtain a two-layer structure yarn, the above-described core yarn and outer layer portion yarn are aligned and subjected to an air entanglement treatment, and then subjected to a drawing false twisting process with a non-contact heater. In this case, the use ratio of both may be core yarn: outer layer yarn = 25: 75 to 75:25 (weight). The air entanglement may be either interlaced or Taslan processing. Specifically, the process of FIG. 1 can be shown.
Here, if heat treatment is performed with a heater while applying overfeeding after confounding, the core yarn shrinks and the outer layer yarn hardly shrinks or self-extends, resulting in a difference in yarn foot between the core yarn and the outer layer yarn. This leads to swelling and spun-like properties when used as a fabric.

  EXAMPLES Hereinafter, although an Example is given and this invention is demonstrated concretely, this invention is not restrict | limited to these Examples. In addition, the analysis item etc. in an Example were measured by the method of the following description.

(A) Diethylene glycol (DEG) content:
The polyester composition chip was decomposed using hydrazine hydrate (hydrated hydrazine), and the content of diethylene glycol in the decomposition product was measured using gas chromatography (HP Hewlett-Packard (HP 6850)).

(B) Tensile strength / elongation of fiber:
Measurement was performed in accordance with the method described in JIS L1070.

(C) Process passability Evaluated by the number of fluff generated from false twisted yarn.
Using a DT-104 type fluff counter device manufactured by Toray Industries, Inc., a polyester false twisted yarn sample is continuously measured at a speed of 500 m / min for 20 minutes to measure the number of fluffs generated, and the number per sample length of 10,000 m Expressed in
○ Less fuzz and good (less than 10 / 10,000m)
△ Slightly fluffy x Lots of fluff and poor product quality (10 / 10,000m or more)

(D) Cation dyeability (dyeability):
CATHILON BLUE CD-FRLH) 0.2 g / L, CD-FBLH 0.2 g / L (both Hodogaya Chemical), sodium sulfate 3 g / L, acetic acid 0.3 g / L in a staining solution at 100 ° C. for 1 hour, It dye | stained by the bath ratio 1:50, and calculated | required the dyeing | staining rate by following Formula.
Dyeing rate = (OD0−OD1) / OD0
OD0: Absorbance at 576 nm of the dye solution before dyeing
OD1: Absorbance at 576 nm of the dyeing solution after dyeing In the present invention, a dyeing rate of 98% or more was judged as good dyeability.

[Example 1]
Add 0.03 parts by weight of manganese acetate and 0.12 parts by weight of sodium acetate trihydrate to a mixture of 100 parts by weight of dimethyl terephthalate, 4.1 parts by weight of dimethyl 5-sodium sulfoisophthalate and 60 parts by weight of ethylene glycol. Then, the temperature was gradually raised from 140 ° C. to 240 ° C., and the ester exchange reaction was performed while distilling out the methanol produced as a result of the reaction out of the system. Thereafter, 0.03 part by weight of orthophosphoric acid was added to complete the transesterification reaction.

  Thereafter, 0.05 parts by weight of antimony trioxide, 2.8 parts by weight of tetrabutoxyphosphonate 5-sulfoisophthalate, 0.3 parts by weight of tetraethylammonium hydroxide, and 0.003 parts by weight of triethylamine were added to the reaction product for polymerization. Move to a container, raise the temperature to 285 ° C., perform a polycondensation reaction at a high vacuum of 30 Pa or less, and terminate the reaction when the agitator power of the polymerization tank reaches a predetermined power or when a predetermined time has elapsed, According to the chip.

  A polyester filament yarn having a elongation of 70% (96 dtex / 24 fil) obtained by spinning at a speed of 4500 m / min and an atmospheric pressure cationic dyeable polyester were melted at 285 ° C., and a spinning speed of 2500 m / min by a known melt spinning method. The resulting polyester filament yarn (180 de / 48f) having an elongation of 150% was aligned and subjected to entanglement treatment and stretch false twisting in the process of FIG.

  That is, the two yarns are supplied to the feed roller 6 and interlaced with the first delivery roller 8 by the interlace nozzle 7 at an overfeed rate of 0.5% and a pneumatic pressure of 4 kg / cm 2, and 40 pieces / m entangled. And subsequently supplied to the false twisting zone via the roller 8 at a draw ratio of 1.284 times, false twist number of 2400 T / m, heater temperature of 210 ° C., yarn speed, that is, the speed of the second delivery roller 11 is 250 m / min. Stretch false twisting was performed.

  When the processed yarn obtained in this way is observed with a microscope, it is a uniform alternating-twisted two-layer structure yarn, and the yarn constituting the core (the elongation of 30%) and the outer layer (the elongation of 55%). It was a processed yarn having a partial entanglement (23 pieces / M) in which filaments interlaced with each other. Further, when weaving using this yarn, there was no trouble such as generation of neps in the weaving process, and the resulting woven fabric had a spun-like texture. Also, good results were obtained in dyeability.

[Examples 2 to 4, Comparative Examples 1 to 4]
In Example 1, it carried out like Example 1 except having changed the addition amount of sodium 5-sulfoisophthalate and 5-sulfoisophthalic acid tetrabutoxyphosphonate so that it might become Table 1. Table 1 shows the results.

[Comparative Example 5]
The same procedure as in Example 1 was repeated except that 0.1 part by weight of tetraethylammonium hydroxide and 0.001 part by weight of triethylamine were used. Table 1 shows the results.

  The spun-like two-layer structure yarn using the normal pressure cationic dyeable polyester yarn of the present invention has good bulkiness, and can be dyed by knitting and knitting with natural fibers, urethane fibers, etc., soft and clear Polyester fabrics for men and women can be provided.

It is the schematic which shows the one aspect | mode of the apparatus which implements the composite false twist process of this invention used in the Example.

Explanation of symbols

1: Lower elongation yarn 2: High elongation yarn 3, 3 ': Original yarn 4: Guide 5: Tension device 6: Feed roller 7: Interlace nozzle 8: First delivery roller 9: Heater 10: Temporary Twister,
11: Second delivery roller 12: Winding roller 13: Winding cheese

Claims (8)

It consists of two types of filament yarns with different elongations. The filament yarns with low elongation are arranged in the core part and the filament yarns with high elongation are arranged in an alternating twist around the core part to form the outer layer part. A two-layer structured yarn in which a part of both filament yarns are mixed and crossed at the boundary portion between the core portion and the outer layer portion to form an entangled portion, and the span satisfies the following requirements: Like-like two-layer structure yarn.
a) The filament yarn having a large elongation constituting the outer layer portion is a polyester yarn in which the main repeating unit is composed of ethylene terephthalate, and the polyester is a metal salt of sulfoisophthalic acid (A) in the acid component, And a copolyester containing the compound (B) represented by the following formula (1) under the conditions satisfying the following formulas 1 and 2 simultaneously.
b) The diethylene glycol content in the copolymerized polyester is 2.5% by weight or less.

[In the above formula, R represents hydrogen or an alkyl group having 1 to 10 carbon atoms, and X represents a quaternary phosphonium salt or a quaternary ammonium salt. ]
3.0 ≦ A + B ≦ 5.0 (Formula 1)
0.2 ≦ B / (A + B) ≦ 0.7 (Formula 2)
Here, A represents the copolymerization amount (mol%) of the metal salt of sulfoisophthalic acid, and B represents the copolymerization amount (mol%) of the compound represented by the above formula (1). ]   The spanlike-like two-layer structured yarn according to claim 1, wherein the metal salt (A) of sulfoisophthalic acid contained in the filament yarn having a large elongation constituting the outer layer portion is 5-sodium sulfoisophthalic acid.   The spanlike-like two-layer structured yarn according to any one of claims 1 and 2, wherein the compound (B) contained in the filament yarn having a high elongation constituting the outer layer portion is 5-sulfoisophthalic acid tetrabutoxyphosphonate. .   The spanlike-like two-layer structured yarn according to any one of claims 1 to 3, wherein the elongation of the filament yarn at the core is 25% or more.   The spunlike two-layer structured yarn according to any one of claims 1 to 4, wherein the elongation of the filament yarn in the outer layer portion is 45% or more.   The spanlike-like two-layer structured yarn according to any one of claims 1 to 5, wherein a difference in elongation between the filament yarn of the core portion and the filament yarn of the outer layer portion is at least 20% or more.   Two or more undrawn polyester yarns with an elongation difference of 20% or more are aligned, entangled, then entangled, and the spun blended yarn is drawn simultaneously with a non-contact heater. The spanlike-like two-layer structured yarn according to any one of claims 1 to 6, characterized in that: It consists of two types of filament yarns with different elongations. The filament yarns with low elongation are arranged in the core part and the filament yarns with high elongation are arranged in an alternating twist around the core part to form the outer layer part. A two-layer structure yarn in which a part of both filament yarns are mixed with each other at the boundary portion between the core portion and the outer layer portion to form an entangled portion, and satisfies the following requirements. A fabric containing yarn.
a) The filament yarn having a large elongation constituting the outer layer portion is a polyester yarn in which the main repeating unit is composed of ethylene terephthalate, and the polyester is a metal salt of sulfoisophthalic acid (A) in the acid component, And a copolyester containing the compound (B) represented by the following formula (1) under the conditions satisfying the following formulas 1 and 2 simultaneously.
b) The diethylene glycol content in the copolymerized polyester is 2.5% by weight or less.

[In the above formula, R represents hydrogen or an alkyl group having 1 to 10 carbon atoms, and X represents a quaternary phosphonium salt or a quaternary ammonium salt. ]
3.0 ≦ A + B ≦ 5.0 (Formula 1)
0.2 ≦ B / (A + B) ≦ 0.7 (Formula 2)
Here, A represents the copolymerization amount (mol%) of the metal salt of sulfoisophthalic acid, and B represents the copolymerization amount (mol%) of the compound represented by the above formula (1). ]

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