JP2653030B2 - Composite yarn - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a novel polyurethane-based composite yarn.

[0002]

2. Description of the Related Art Conventionally, there is a method in which a polyurethane elastic yarn is wound around with a bulky processed yarn as a covering yarn to form a covering elastic yarn. As the manufacturing method, there are a method using a covering machine using a hollow spindle, a method of aligning and twisting, and the like.

[0003] Japanese Patent Publication No. 56-5850 discloses a method in which the temperature of false twisting is increased so that polyurethane elastic yarn is not easily separated by bonding or fusion. In addition, there is also known a method in which a polyurethane elastic yarn is aligned with a filament to be a covering yarn and, at the same time, false twisting is performed. Further, JP-A-63-1454
No. 39 discloses that a polyorganosiloxane is added to a polyurethane elastic component, a composite fiber is spun with a thermoplastic fiber-forming polymer component, and then the obtained composite yarn is subjected to draw false twisting to form a two-component composite yarn. Is proposed.

[0004]

However, the method using the spindle has its own limit in the number of revolutions of the spindle.
In addition, the bulky yarn must be separately manufactured by a false twisting machine, which has a disadvantage that the production speed is slow and the production cost is high due to the versatility of the process.

In the case of the method disclosed in Japanese Patent Publication No. 56-5850, the polyurethane elastic yarn becomes thermally embrittled, and the elastic properties are significantly impaired.

Further, according to the method disclosed in JP-A-63-145439, it is necessary to add a polyorganosiloxane to the urethane elastic yarn side, and if too much is added, the heat resistance of the urethane elastic yarn becomes poor. Conversely, if the amount is small, there is a problem that it is difficult to divide the two components, and it has not been practically used.

[0007] On the other hand, the method of aligning the polyurethane elastic yarn and the filament to be the covering yarn during draw false twisting has high productivity in that it can be processed at a production speed of about 100 m / min. It is difficult to uniformly coat the polyurethane elastic yarn, and there is a disadvantage that when the polyurethane elastic yarn passes through the false twisting heater in a stretched state, it is heat-set or partially thermally embrittled, thereby deteriorating the stretchability. Further, there is a disadvantage that the polyurethane elastic yarn and the bulky yarn are separated when passing through a guide or a tensor in a subsequent processing step, so that additional twisting must be performed after false twisting.
Furthermore, it is difficult to set up the polyurethane elastic yarn, so that a special positive feeding device must be provided, which makes the device complicated and difficult to operate. Particularly, when the feeding speed of the polyurethane elastic yarn exceeds 150 m, there is a problem that the start becomes extremely difficult.

[0008]

Means for Solving the Problems The present inventors have made intensive studies to solve the above-mentioned problems and completed the present invention.

That is, the composite yarn of the present invention is a composite fiber comprising a water-soluble polyester (component E), a thermoplastic fiber-forming polymer (component F), and a polyurethane (component U), wherein the component E is F and U. It is characterized in that both components are in contact with at least one or more locations in the yarn cross section and the E component is exposed on the fiber surface.

Hereinafter, the present invention will be described in detail. The polyurethane as the core component constituting the present invention refers to a thermoplastic polyurethane or a crosslinked polyurethane. Here, the thermoplastic polyurethane is obtained by reacting a polymer diol with an organic diisocyanate and a chain extender, and refers to a polymer that can be melt-spun.

As the high molecular diol, ether polyols having hydroxyl groups at both ends and having a molecular weight of 500 to 5,000, such as polytetramethylene glycol and polypropylene glycol, polyhexamethylene adipate, polybutylene adipate, polycarbonate diol, polycaprolactone diol Glycols such as ester-based polyols and the like, or mixtures thereof, and copolymerized diols.

Examples of the chain extender include 1,4-butanediol having a molecular weight of 500 or less, ethylene glycol, propylene glycol, and bishydroxyethoxybenzene.

Examples of the organic diisocyanate include tolylene diisocyanate (TDI), 4,4'-diphenylmethane diisocyanate (MDI), non-yellowing diisocyanates such as 1,6-hexamethylene diisocyanate, and mixtures thereof.

The hardness of the polyurethane polymerized from these components by a known method is preferably in the range of 75 to 98. If the hardness is less than 75, it is not preferable because problems such as poor recovery of the obtained yarn and insufficient heat resistance in practical use occur. Conversely, if the hardness exceeds 98, the reversibility of the polyurethane itself is inferior, and the resilience of the yarn cannot be expected unless the crimped structure is used, and the optimum spinning condition range of the polyurethane is extremely narrow. , More preferably in the range of 82 to 95.

Known modifiers such as titanium oxide, an ultraviolet stabilizer, an ultraviolet absorber, and an antibacterial agent can be added to such a polyurethane.

When further heat resistance and further recovery properties are required as the composite yarn, a crosslinked polyurethane obtained by reacting a polyisocyanate with the above polyurethane may be selected. As the production method, a method proposed by us (JP-B-58-46573), that is, a method in which a polyisocyanate is added to and mixed with a molten thermoplastic polyurethane to complete allophanate cross-linking during or after spinning may be used.

The polyisocyanate is a compound comprising a polyol component and an isocyanate component and having two or more, preferably two or three, isocyanate groups in the molecule. As the polyol component, in addition to the above-mentioned diol having a molecular weight of 500 to 4000 used for the synthesis of polyurethane, a diol and a triol are mixed to obtain an average functionality of 2 or more.
A synthetic polyol having a functionality of 2 to 3 or a functionality of 2 to 3 can also be suitably used. On the other hand, as the isocyanate component, the dicisocyanate used in the synthesis of polyurethane, a trimer of an organic diisocyanate, a reaction product of trimethylolpropane and an organic diisocyanate, or an isocyanate having a functionality of 2 to 3 is used. (For example, carbodiimide-modified isocyanate) alone or a mixture thereof.

The reaction of the above components can be carried out by a known method, but it is preferable to carry out the reaction such that the isocyanate group content becomes excessive. Of course, this amount varies depending on the desired physical properties such as heat resistance and recovery properties, and the polyol used.

The amount of the polyisocyanate to be added is preferably in the range of 5 to 40% by weight based on the mixture of the polyurethane used as the core component and the polyisocyanate.
The amount added depends on the NCO group content and type of the polyisocyanate used, but if the amount added exceeds 40%, the mixing becomes uneven and the spinning becomes unstable or the mechanical properties of the yarn are unsatisfactory. On the contrary, if it is less than 5%, the desired heat resistance cannot be obtained, which is not preferable. Therefore, the content is preferably in the range of 10 to 30% by weight.

In this way, a cross-linked structure mainly containing allophanate cross-links is formed in the polyurethane in the core component. When the crosslinked structure is mainly formed by burette bonding, spinnability is extremely deteriorated, which is not preferable. That is, since the formation rate of burette cross-linking is higher than that of allophanate cross-linking, the viscosity of the system increases during spinning, and stable spinning tends to be impossible.

On the other hand, the water-soluble polyester used in the present invention has the following composition.

Aromatic dicarboxylic acid having a sulfonic acid salt of an acid component and / or an ester-forming derivative thereof (Component A)
Particularly preferred are those having a sulfonic acid alkali metal base, for example, 4-sulfoisophthalic acid, 5-sulfoisophthalic acid, sulfoteretephthalic acid, 4-sulfophthalic acid, 4-sulfonaphthalene-2,7-dicarboxylic acid,
An alkali metal salt such as 5- [4-sulfophenoxy] isophthalic acid or an ester-forming derivative thereof is used, and 5-sulfoisophthalic acid sodium salt or an ester-forming derivative thereof is particularly preferable. These sulfonic acid group-containing dicarboxylic acids and / or ester-forming derivatives thereof are used in the range of 5 to 20 mol%, particularly preferably 6 to 12 mol%, based on the total dicarboxylic acid component from the viewpoint of water solubility and water resistance. Good range. This amount is 5 mol%
If it is less than 20%, the solubility in water is inferior. On the contrary, if it exceeds 20% by mole, it causes troubles during polymerization and poor operability at the time of chipping, resulting in poor handling and thermoplasticity of the obtained polymer. It is not preferable because it has an adverse effect.

The aromatic dicarboxylic acid and / or its ester-forming derivative (component B) excluding the above-mentioned component A include terephthalic acid and / or its ester-forming derivative (component B1) and isophthalic acid and / or its ester-forming derivative ( Component B2) is particularly preferred in view of the availability of raw materials, industrial applicability and good mechanical properties, and more preferably the amount is at least 55 mol% of the total dicarboxylic acid. If the amount is less than 55 mol%, the physical properties of the obtained polymer, particularly the melt heat stability and the heat resistance, are unfavorably low. Further, the molar ratio of the B1 component / B2 component is preferably 2/8 to 8/2 from the viewpoint of making the polymer amorphous.

The alicyclic dicarboxylic acid and / or its ester-forming derivative component (component C) includes 1,4-cyclohexanedicarboxylic acid, 1,3-cyclohexanedicarboxylic acid, 1,2-cyclohexanedicarboxylic acid, 1,3
-Cyclopentanedicarboxylic acid, 4,4'-bicyclohexylcarboxylic acid, and the like, or ester-forming derivatives thereof are used.

Further, examples of the aliphatic dicarboxylic acid and / or its ester-forming derivative component (D component) include adipic acid, sebacic acid and azelaic acid. and,
The component C and the component D are preferable from the viewpoint of not only preventing blocking of the obtained polymer that satisfies the relationship of 0 mol% ≦ C + 4 × D ≦ 40 mol%, but also from the viewpoint of water resistance.
This is because, when the D component is, for example, 20 mol% and the C component is 0 mol%, the glass transition temperature of the obtained polymer becomes about room temperature, so that the handleability becomes poor and the physical properties of the polymer become poor. .

On the other hand, as the diol component, ethylene glycol is used in an amount of 50 mol% or more based on the total glycol component from the viewpoint of the spinnability of the polyester copolymer. In addition, as a glycol component, other than ethylene glycol, mechanical properties, 1,4-butanediol, neopentyl glycol, and the like within a range that does not adversely affect heat melting stability and the like.
1,4-cyclohexanedimethanol, diethylene glycol, triethylene glycol, polyethylene glycol and the like may be used in combination.

As the polymerization method of the copolymerized polyester used in the present invention, various ordinary methods can be used. For example, a transesterification reaction of dimethyl ester of dicarboxylic acid and glycol is performed, and after methanol is allowed to flow,
A method of performing polycondensation under a reduced pressure and a high vacuum, or a method of performing an esterification reaction of a dicarboxylic acid and a glycol and allowing the generated water to flow out, and then gradually reducing the pressure and performing a polycondensation under a high vacuum. Or, when a combination of dimethyl ester of dicarboxylic acid and dicarboxylic acid is used as a raw material, the transesterification reaction of dimethyl ester of dicarboxylic acid with glycol,
Further, there is a method in which a dicarboxylic acid is added to carry out an esterification reaction, followed by polycondensation under high vacuum. As the transesterification catalyst, manganese acetate, calcium acetate, zinc acetate and the like can be used, and as the polycondensation catalyst, known ones such as antimony trioxide, germanium oxide, dibutyltin oxide and titanium tetrabutoxide can be used. As a stabilizer, a phosphorus compound such as trimethyl phosphate or triphenyl phosphate, or a hindered phenol compound such as Irganox 1010 may be used. However, various conditions such as a polymerization method, a catalyst, and a stabilizer are not limited to the above examples.

Although the above polyester used in the present invention has water solubility, the term “water solubility” as referred to in the present invention is not strictly physicochemically, but includes those which dissolve and / or finely disperse in water.

Among such water-soluble polyesters, those having a glass transition temperature in the range of 35 to 80 ° C. are preferred. If the temperature is lower than 35 ° C., the handleability of the obtained composite yarn becomes poor, which is not preferable. Conversely 80
C. is not preferable because the solubility in water becomes insufficient. Within the above range, for example, it is easily soluble in hot water at a temperature of 50 ° C. or higher, but hardly soluble or hardly sticky in water at a temperature lower than this temperature, and the handleability is improved. The glass transition temperature was measured by using a thermal analyzer (TAS100, manufactured by Rigaku Corp.) at a rate of 10 ° C./min in a nitrogen stream at a rate of once to 180 ° C., then cooling to −150 ° C., and then heating again. did.

The water-soluble polyester is preferably capable of being melt-spun. For example, it is desirable that the water-soluble polyester exhibits fluidity in the range of 180 ° C. to 300 ° C. and can be spun without foaming or decomposition. Further, additives such as an antioxidant and a slipping agent may be added to the water-soluble polyester.

As the thermoplastic fiber-forming polymer, nylon 6, nylon 66, nylon 612, nylon 1
1, polyamides such as nylon 12 and copolymers containing these as main components, or polyesters such as polyethylene terephthalate, polybutylene terephthalate, polyoxyethylene benzoate and copolymers containing these as main components, or polypropylene, polyethylene and these And a thermoplastic polymer or copolymer having a molecular weight capable of being melt-extruded and having a fiber-forming property. Of these, polyamide and polyester are more preferred.

Usually, the melting temperature of the thermoplastic polyurethane elastic body is preferably from 190 to 240 ° C., particularly preferably from 200 to 230 ° C. Therefore, it is preferable that the melting temperature of the thermoplastic fiber-forming polymer that is simultaneously discharged is also in the range of 190 to 240 ° C. From this viewpoint, as the thermoplastic fiber-forming polymer, those having relatively low viscosity such as nylon 6, nylon 66, and polyethylene terephthalate, or copolymers containing nylon 6, nylon 66, polyethylene terephthalate, polybutylene terephthalate, and polypropylene as main components are used. Those having a combined melting point of 230 ° C. or lower, particularly 210 ° C. or lower are suitable.

A sliding agent, a conductive agent,
An additive such as an antibacterial agent may be added.

The three components of the composite yarn of the present invention have been described above. Next, these composite forms will be described. Of the above-mentioned water-soluble polyester (component E), thermoplastic fiber-forming polymer (component F), and polyurethane (component U), the component E is in contact with both the F and U components in at least one place in the fiber cross section. Things are desirable. Further, it is desirable that the E component is present on all surfaces where the U and F components come into contact. This is to enable the F component and the U component to be separated by water treatment in the subsequent process. FIG. 1 shows a preferred example of the composite form used in the present invention. FIG. 2 shows an example for comparison.

The polyurethane component can be partially exposed on the fiber surface. In this case, the ratio of the polyurethane component to the entire fiber surface is preferably 30% or less in terms of the sectional area ratio. Further, it is preferably at most 15%, particularly preferably at most 5%. This is because if the polyurethane is placed on the yarn surface beyond this proportion,
It is not preferable because the operability at the time of stretch false twisting is adversely affected due to the size of agglutination and friction of the polyurethane, and slimming and dyeing properties become problems when knitted, for example. Also, as the area ratio of the E component in the yarn cross section,
2-30%, U component 48-90%, F component 10-4
A range of 5% is preferred.

On the other hand, the cross section of the composite yarn may be circular or irregular. Preferably, the shape is circular from the viewpoint of operation stability.

In the present invention, an example of a method for producing a composite yarn using a crosslinked polyurethane will be described. A portion where a polyisocyanate is added and mixed to a portion where a thermoplastic polyurethane is melt-extruded, a portion where a water-soluble polyester and a thermoplastic fiber-forming polymer component are each melt-extruded, and a composite spinning having a shape as shown in FIG. It is preferably carried out by a melt compound spinning apparatus having a head portion having a die. The number of F components surrounding the polyurethane is preferably two or more.

As a device used for adding the polyisocyanate during spinning, a known device can be used. It is also possible to use a kneading device having a rotating section in the portion where the polyisocyanate is added to and mixed with the polyurethane in a molten state, but it is more preferable to use a mixing device having a stationary kneading element. As the mixing device having the stationary kneading element, a known device can be used. The shape and the number of elements of the static kneading element vary depending on the conditions used, but it should be selected so that the thermoplastic polyurethane and the polyisocyanate are sufficiently mixed before entering the composite spinneret. This is essential, and usually 20 to 90 elements are provided.

As described above, the polyurethane mixed with the polyisocyanate is used as one component, and the water-soluble polyester and the thermoplastic fiber-forming polymer are melted by another two extruders and guided to a desired composite spinneret for spinning. The composite yarn of the present invention is obtained.

The winding method may be any of a method using a usual winding machine (usually a spinning speed of 500 to 4,000 m / min) and a method of drawing at the time of spinning, a so-called spin draw method. In the case of using a normal winding machine, a stretching step of 1.5 to 4 times is required in a state of presence or absence of heat. This is for the purpose of incorporating the distortion of the polyurethane together with the stretching of the thermoplastic fiber-forming polymer. Among them, the spin draw method is more preferable.
That is, the composite yarn is spun by a draw (drawing) roller during spinning.
This is because, if the film is stretched in the range of 3 to 6.5 times with or without heat, the handleability becomes very easy in a subsequent step, for example, when performing false twisting. When drawing false twist,
The temperature is preferably from 100 to 200 ° C, more preferably from 120 to 180.
It is preferable to false-twist at a magnification of 1.1 to 6 times in the range of ° C. The number of false twists is preferably in the range of 10 to 2,000 T / m.

As the false twisting machine, a known device, for example, a conventional outdraw type drawing false twisting machine, or in the case of a drawn filament or spin draw yarn, an indone drawing type may be used. The heat treatment heater to be used may be either a plate type contact type or a tube type non-contact type.

As a method for treating the yarn of the present invention with water, a method in which the yarn of the present invention is made into a fabric and then the water-soluble polyester component is dissolved with water in a scouring, dyeing step or the like may be used.

[0043]

According to the present invention, it has conventionally been necessary to separately prepare a polyurethane elastic yarn and a filament made of a non-elastomer, which is a covering yarn. can do.
Since the elongation of the composite yarn obtained by spinning can be reduced, handleability is very easy. Moreover, it is advantageous that the elasticity is restored by performing the water treatment in the subsequent step.
In order to spin polyurethane at the same time as water-soluble polyester and fiber-forming polymer, for example, 3,000 m
It can be wound at a speed like.

Because of the excellent characteristics as described above, it can be used for various applications. For example, if it is used for swimwear, a product with a shortened process and excellent operability can be obtained, and in addition, it can be suitably used for socks, innerwear, pantyhose and the like.

[0045]

EXAMPLES Hereinafter, the present invention will be described specifically with reference to examples, but the present invention is not limited to these examples. Example 1 Thermoplastic polyurethane Polycaprolactone glycol 1, having a molecular weight of 2,000
It was synthesized by a conventional method using 482 parts by weight of 482 parts by weight of p, p'-diphenylmethane diisocyanate and 214 parts by weight of 1,4 butanediol as a chain extender. The relative viscosity of this polymer at a concentration of 1 g / 100 cc measured in dimethylformamide at 25 ° C. was 2.15. Polyisocyanate 850 parts by weight of polycaprolactone glycol having a molecular weight of 850, p, p'-diphenylmethane diisocyanate 5
By reacting with 100 parts by weight, a viscous compound was obtained. The NCO% of this compound was 6.2% by weight. A thermoplastic fiber-forming polymer 6 nylon having a relative viscosity of 2.0 was used. Water-soluble polyester copolymer 38.74 parts by weight of dimethyl terephthalate, 31.95 parts by weight of dimethyl isophthalate, 10.34 parts by weight of dimethyl sodium 5-sulfoisophthalate, 54.48 parts by weight of ethylene glycol, calcium acetate monohydrate 0.07 salt
3 parts by weight and 0.024 parts by weight of manganese acetate tetrahydrate were subjected to transesterification while distilling off methanol at 170 to 220 ° C. under a nitrogen stream, followed by 0.5 parts by weight of trimethyl phosphate and a polycondensation catalyst. As antimony trioxide
04 parts by weight and 1,4-cyclohexanedicarboxylic acid 1
After adding 7.17 parts by weight, almost the theoretical amount of water was distilled off at a reaction temperature of 220 to 235 ° C. to carry out esterification. Thereafter, the pressure inside the reaction system was further reduced and the temperature was raised.
Polycondensation was performed at Hg for 2 hours. Subsequently, polymerization was carried out in the same manner at a composition ratio shown in Table 1.

The obtained polymer was evaluated by the following method. Glass transition temperature: Thermal analyzer (TAS1) manufactured by Rigaku Corporation
00) at once at a rate of 10 ° C./min in a nitrogen stream.
The temperature was raised to 80 ° C., then cooled to −150 ° C., and the temperature was raised again for measurement. Water solubility: 425 g of water was added to 75 g of the polyester copolymer, and the mixture was stirred at 95 ° C. for 3 hours and evaluated.

Spinning of the water-soluble polyester alone was performed. The nozzle temperature was 230 ° C., the nozzle diameter was 0.5 mm, the winding speed was 500 m / min, the oil agent was a dimethyl silicone-based oil agent, and a brand 40 denier 1 filament yarn was collected. The results are shown in Table 1. From Table 1,
The polymer from Comparative Example 1-1 was inferior in handleability at the time of drying, and the yarn obtained therefrom had a large amount of sticking, so that the elongation of the yarn was not measured. Comparative Example 1-2
Is 5-sulfoisophthalic acid dimethyl sodium salt
Less than mole%, the polymer was insoluble in water.
The yarn from Comparative Examples 1-3 was very brittle and poor in handleability. In Comparative Example 1-4, since the diol component was 100% diethylene glycol, the glass transition temperature was close to room temperature. In addition, spinning was not performed on this system because drying was extremely difficult and handling was poor.

Example 2 Next, an example in which a composite yarn is used will be described. The thermoplastic polyurethane was melted by an extruder, and the polyisocyanate was added in an amount of 15% by weight in the course of the melt, and then kneaded sufficiently with a 35-element static mixer (manufactured by Kenix). On the other hand, Example 1
-1 water-soluble polyester is melted by another extruder,
Further, the nylon 6 was melted by another extruder, and a polyurethane (U) component 60, a water-soluble polyester (E) 5,
Nylon (F) 35% by volume (Example 2-1), 4% each
It was weighed so as to be 8, 10, and 42% by volume (Example 2-2), and was led to a composite ferrule having a shape shown in FIG. The nozzle temperature was 235 ° C. For winding, the first godet roller of the winding machine is 1,000 m by the spin draw method.
/ Min, the second godet roller for drawing (draw roller) was doubled with respect to the speed of the first godet roller, the heater temperature of the roller was set to 100 ° C., and two filaments having a fineness of 70d of the composite yarn were obtained.

On the other hand, the ratio of U / E / F is 10% / 5% /
Spinning was carried out in the same manner as in the Example with 85% (Comparative Example 2-
1). The spinning was performed in the same manner as in Example 2-1 except that the composite form (Comparative Example 2-2) shown in FIG. 2 was used. In addition, an attempt was made to spin a 70 d / 2 filament polyurethane elastic yarn under the same winding conditions, but no yarn could be collected by such a winding method (Comparative Example 2-3). In the spinning described above, two types of oil agents, dimethyl silicon and emulsion, were used.

The obtained composite yarn was false twisted in the S and Z directions under the conditions of a draw ratio of 1.5, a false twist temperature of 180 ° C. and a false twist number of 700 T / m. Next, a pantyhose was made with a four-neck knitting machine using only these false twisted yarns, and dyed with an acidic dye at 100 ° C. for 30 minutes to a flesh color. Further 110
After a wet heat treatment at 15 ° C. for 15 seconds, the stretch-back property was measured. Here, the stretch back property means that the calf part of the stocking is 100% perpendicular to the stocking length.
Is repeated five times, and the ratio of the 80% elongation stress in the final elongation to the 80% recovery stress in the final elongation is shown.
The larger the value, the better the fit. Stretch back property = (80% elongation recovery stress / 80% elongation stress) × 100 These results are shown in Table 2.

[0051]

[Table 2]

From Table 2, it can be seen that the operability was poor when the proportion of polyurethane in the fiber cross section was small as in Comparative Example 2-1 and when the composite form was as in Comparative Example 2-2. These yarns have a strength of 0.4,
It was as low as 0.5 g / d. In the yarn of this example in the pantyhose, polyurethane and nylon were completely separated.
Further, the pantyhose of the present embodiment was thinner and lighter than the conventional one made of covering yarn.

[0053]

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a fiber showing a composite form suitable for the composite yarn of the present invention.

FIG. 2 is a fiber cross-sectional view showing an example of a composite form outside the present invention.

[Table 1]

Continued on the front page (51) Int.Cl. ⁶ Identification number Office reference number FI Technical display location D01F 8/14 D01F 8/14 Z 8/16 8/16 D02G 1/02 D02G 1/02 Z 3/32 3 / 32 D02J 1/22 D02J 1/22 N D04B 1/18 D04B 1/18 (56) References JP-A-61-194247 (JP, A) JP-A-64-14321 (JP, A)

Claims (2)

(57) [Claims] 1. A composition comprising a water-soluble polyester (component E), a thermoplastic fiber-forming polymer (component F), and a polyurethane (component U), wherein the component E comes into contact with both the F and U components at at least one point in the yarn cross section. Wherein the water-soluble polyester has a sulfonate as an acid component and has an aromatic dicarboxylic acid and / or an ester-forming derivative thereof (Component A), an aromatic dicarboxylic acid and / or an ester-forming derivative thereof ( B) and an alicyclic dicarboxylic acid and / or an ester-forming derivative thereof (component C) and an aliphatic dicarboxylic acid and / or an ester-forming derivative thereof (component D); Component, D
A composite yarn wherein the mole percentages a, b, c, and d of the components satisfy all of the following formulas (1) to (4), and the glycol component comprises at least 50 mole% of ethylene glycol. 5 ≦ a ≦ 20 (1) 55 ≦ b (2) 0 ≦ c + 4 × d ≦ 40 (3) a + b + c + d = 100 (4) 2. The composite yarn according to claim 1, wherein the water-soluble polyester has a glass transition temperature of 35 ° C. to 80 ° C.