JP6195715B2 - Composite fiber, method for producing polyurethane elastomer fabric, and polyurethane elastomer fabric - Google Patents

Description

  The present invention relates to a composite fiber capable of forming a fabric that gives a good wearing feeling to a human body.

  Conventionally, foams made of polymers having shape memory properties are known. These foams and fabrics are deformed at a temperature equal to or higher than the glass transition temperature such as a polymer flow start temperature, and are cooled to the glass transition temperature or lower as they are to store a desired shape. For example, in Patent Document 1, the glass transition temperature is 10 to 35 ° C., the loss tangent in the temperature range of 10 to 35 ° C. is 0.20 to 0.80, and the storage elastic modulus (G ′) A shape-following resin foam having a ratio (G′max / G′min) between the maximum value (G′max) and the minimum value (G′min) of 3.0 to 30 is disclosed.

  On the other hand, a good wearing feeling is required for the fabric to be worn on the human body. For example, in Patent Document 2, the glass transition temperature is in the range of 15 ° C. to 35 ° C., the peak value of the dynamic dynamic loss tangent is in the range of the glass transition temperature, and the dynamic dynamic loss tangent is A fabric having a peak value of 0.2 or more and 1.0 or less is disclosed, and it is described that the fabric is produced from a single covered yarn having a specific polyurethane elastomer as a bare yarn and nylon as a covering yarn.

JP 2009-35697 A (Claim 1, paragraphs [0009] to [0013]) JP 2011-149108 A (Claim 1 and paragraphs [0025] to [0034])

  However, the shape-following resin foam described in Patent Document 1 can be attached to the body surface of a human body to follow the shape of the body surface. It is impossible to make it follow.

  On the other hand, the fabric described in Patent Document 2 can follow the dynamic movement of the human body, but a specific polyurethane elastomer yarn for forming such a fabric has a low glass transition temperature. The fiberizing process for producing the fabric and the process passability after the fiberizing are not good, and it is difficult to actually provide the fabric with such a polyurethane elastomer yarn.

  Accordingly, the object of the present invention is not only to be used for fabrics including knitted fabrics, woven fabrics and nonwoven fabrics, which have a good wearing feeling with respect to the dynamic movement of the human body, but also has good process-passability when producing fabrics. Is to provide a good thread.

  The inventors of the present invention have conducted various studies on yarns suitable for fabrics that give a good wearing feeling to the dynamic movement of the human body. As a result, specific polyurethane elastomer yarns that give a good wearing feeling to the human body are worn. In order to improve the feeling, it is important to have a low glass transition temperature in a specific range, but when having such a low glass transition temperature, it is very difficult to fiberize and fabricate. I found. And further research, combining this polyurethane elastomer with a specific thermoplastic polymer, and covering the specific ratio around the polyurethane elastomer with this thermoplastic polymer and compounding it, the polyurethane elastomer having a low glass transition temperature is used. The present invention was completed by finding that it can be satisfactorily made into fibers and fabrics.

  That is, the present invention is composed of a polyurethane elastomer (A component) having a glass transition temperature in the range of 15 ° C. to 50 ° C. and a readily soluble thermoplastic polymer (B component). It is a composite fiber that becomes the core and the B component covers 70% or more of the total circumference of the A component.

  In the fiber, the component B may be formed of at least one selected from a readily soluble polyester and a thermoplastic polyvinyl alcohol polymer.

  The single fiber fineness of the composite fiber may be about 0.3 to 50 dtex. Further, the composite ratio (mass ratio) of the A component and the B component may be about A: B = 90: 10 to 40:60.

  The composite structure of the composite fiber is not particularly limited as long as the coating ratio by the B component is satisfied, and may have various structures, but the core-sheath structure in which the A component is the core component and the B component is the sheath component. It is preferable to have.

  Moreover, this invention removes B component from the preparation process which prepares the said composite fiber, the composite fiber fabric preparation process which produces the fabric comprised by the composite fiber using the said composite fiber, and the said fabric. And a removing step of obtaining a polyurethane elastomer fabric, and a method for producing a polyurethane elastomer fabric is also included.

  Furthermore, this invention also includes the polyurethane elastomer fabric manufactured by the said method. In such a fabric, the single fiber fineness of the polyurethane elastomer fiber constituting the fabric may be 0.3 to 50 dtex.

  It should be noted that any combination of at least two components disclosed in the claims and / or the specification and / or the drawings is included in the present invention. In particular, any combination of two or more of the claims recited in the claims is included in the present invention.

  In the present invention, a specific polyurethane elastomer and a specific thermoplastic polymer are combined, and these are composite-spun with a specific structure. Therefore, even when a polyurethane elastomer having a low glass transition temperature is used, the fiber processability is improved. It is possible to improve.

  In one embodiment of the present invention, a composite fiber excellent in spinnability can be obtained even when the single fiber fineness is low.

  Furthermore, in the present invention, the flexibility in the range of 15 ° C. to 50 ° C., preferably 15 to 45 ° C., more preferably 15 ° C. to 35 ° C. is high. It is possible to efficiently produce a polyurethane elastomer fabric capable of giving a feeling of fit.

The present invention will be more clearly understood from the following description of preferred embodiments with reference to the accompanying drawings. However, the embodiments and drawings are merely for illustration and description and should not be used to define the scope of the present invention. The scope of the invention is defined by the appended claims.
It is a fiber cross-section photograph which shows an example of the form of the composite fiber for obtaining the fiber of this invention. It is a figure which shows an example of the fiber cross section of the fiber of another embodiment of this invention. It is a figure which shows an example of the fiber cross section of the fiber of another embodiment of this invention. It is a figure which shows an example of the fiber cross section of the fiber of another embodiment of this invention.

Hereinafter, the present invention will be described in detail. The composite fiber of the present invention is composed of an A component which is a polyurethane elastomer and a B component which is a readily soluble thermoplastic polymer. In the fiber cross section, the A component is the core, and the B component is the entire circumference of the A component. A composite fiber covering 70% or more.
The A component and the B component may be compatible with each other at the interface, but are preferably incompatible with each other.

(A component)
The polymer forming the component A of the composite fiber of the present invention is a polyurethane elastomer having a glass transition temperature in the range of 15 ° C to 50 ° C. The polyurethane elastomer is not particularly limited as long as it has such a low glass transition temperature, but the polyurethane elastomer having the above-mentioned properties is, for example, a bifunctional diisocyanate having a molecular weight of 160 to 310 and a molecular weight of 400 to 2000. A bifunctional polyol and a chain extender that is a diol or diamine having a molecular weight of 60 to 400 are blended in a molar ratio of 2.00 to 1.10: 1.00: 1.00 to 0.10. It is possible to polymerize by a prepolymer method.

  The bifunctional isocyanate can be appropriately selected within the range in which the polyurethane elastomer can be obtained as long as the molecular weight is in the range of 160 to 310. For example, as the preferred bifunctional isocyanate, 2,4-toluene diisocyanate, Examples include 4,4′-diphenylmethane diisocyanate, carbodiimide-modified 4,4′-diphenylmethane isocyanate, hexamethylene diisocyanate, and the like. These bifunctional isocyanates can be used alone or in combination.

  The bifunctional polyol can be appropriately selected within the range in which the polyurethane elastomer can be obtained as long as the molecular weight is in the range of 400 to 2000. For example, preferable bifunctional polyols include polypropylene glycol, 1, 4- Examples include butane glycol adipate, polytetramethylene glycol, polyethylene glycol, and propylene oxide adducts of bisphenol-A. The bifunctional polyol may be used as a product obtained by further reacting a bifunctional carboxylic acid or cyclic ether, and such a product is also treated as a bifunctional polyol. These bifunctional polyols can be used alone or in combination.

  The diol and diamine used as the chain extender can be appropriately selected within the range in which the polyurethane elastomer can be obtained as long as the molecular weight is in the range of 60 to 400. Examples thereof include glycol, 1,4-butane glycol, bis (2-hydroxyethyl) hydroquinone, bisphenol-A ethylene oxide adduct, and bisphenol-A propylene oxide adduct. Preferred examples of the diamine include ethylenediamine, 1,2-propylenediamine, 1,3-propylenediamine, m-xylylenediamine, p-xylylenediamine, 4,4′-diphenylmethanediamine, cyclohexylenediamine, 2 , 4-tolylenediamine, 2,6-tolylenediamine, hexamethylenediamine and the like. These chain extenders can be used alone or in combination.

  A polyurethane elastomer is synthesized by the prepolymer method using the above-mentioned bifunctional isocyanate, bifunctional polyol, and chain extender as raw materials, and if necessary, using a catalyst. By synthesis, component A in which bifunctional isocyanate: bifunctional polyol: chain extender is blended at a ratio of 2.00 to 1.10: 1.00: 1.00 to 0.10 is synthesized. The component A may contain various additives such as matting agents (light shielding agents) such as titanium oxide and zinc oxide, antioxidants, and ultraviolet absorbers as necessary. These additives can be appropriately used as long as a polyurethane elastomer having the desired properties can be obtained, regardless of whether it is added to the polymerization raw material of component A or at any of the polymerization stages.

As polyurethane elastomers having a glass transition temperature in the range of 15 ° C. to 50 ° C., for example, the following products are commercially available from SMP Technologies.
SMP MM-2520 (Tg = 25 ± 3 ° C., 1,4 butanediol)
SMP MM-3520 (Tg = 35 ± 3 ° C., 1,4 butanediol)
SMP MM-4520 (Tg = 45 ± 3 ° C., 1,4 butanediol)
SMP MA-2520 (Tg = 25 ± 3 ° C., 1,2 ethylenediamine)
SMP MA-3520 (Tg = 35 ± 3 ° C., 1,2 ethylenediamine)
SMP MA-4520 (Tg = 45 ± 3 ° C., 1,2 ethylenediamine)

  Since the polymerized A component has a glass transition temperature in the range of 15 ° C. to 50 ° C., the flexibility at room temperature is high, and the glass transition temperature of the A component is 15 ° C. to 45 ° C., more preferably 15 ° C. to 40 ° C. When it is within the range of 15 ° C., particularly preferably 15 to 35 ° C., when it is applied to the human body at the same level as the surface temperature of the human body, it feels comfortable and / or fit according to the dynamic movement of the human body. It is possible to give

  Here, the glass transition point is a temperature at which the mechanical properties of the polymer elastomer rapidly change. In the present invention, the dynamic dynamic loss tangent (hereinafter sometimes referred to as tan δ) has a peak. It is defined as the temperature shown. Here, tan δ is defined as the tangent of the ratio G ″ / G ′ of the loss elastic modulus G ″ to the storage elastic modulus G ′ at a frequency of 1 Hz. The glass transition temperature (Tg) is close to the body surface temperature of the human body and is more preferably in the range of 25 ° C to 40 ° C, particularly 25 ° C to 35 ° C.

(B component)
The easily soluble (or easily decomposable) thermoplastic polymer that is the component B of the conjugate fiber of the present invention is melt-spinnable and is relatively resistant to solvents or chemicals compared to the polyurethane elastomer that is the component A. Any material that can be easily dissolved or decomposed can be used.
Examples of such easily soluble polymers include thermoplastic polymers that can be dissolved and decomposed by water (including warm water), alkalis, acids, and the like, and preferably easily soluble polyesters that can be dissolved and decomposed in alkalis. Examples thereof include thermoplastic polymers and thermoplastic polyvinyl alcohol polymers that can be dissolved and decomposed in water.

  When using an easily soluble polyester polymer, it is preferable to use a polyester having a high alkali dissolution rate. As the easily soluble polyester polymer, for example, polar group-containing copolymer polyester, aliphatic polyester, and the like can be employed.

Examples of the polar group-containing copolymer polyester include 1 to 5 mol% of an ester-forming sulfonic acid metal salt compound (for example, 5-sodium sulfoisophthalic acid, 5-potassium sulfoisophthalic acid, etc.) and a polyalkylene glycol (for example, polypropylene glycol). And a copolyester formed by copolymerizing 5 to 30% by mass of a poly C _1-4 alkylene glycol such as polyethylene glycol) and a conventionally used diol component and dicarboxylic acid component.

  Examples of the aliphatic polyester include polylactic acid; poly (ethylene succinate), poly (butylene succinate), poly (butylene succinate cobutylene adipate) and the like polyesters of aliphatic diols and aliphatic carboxylic acids; poly ( Glycolic acid), poly (3-hydroxybutyric acid), poly (3-hydroxyvaleric acid), poly (6-hydroxycaproic acid) and other polyhydroxycarboxylic acids; poly (ε-caprolactone) and poly (δ valerolactone) and other poly (ω Hydroxyalkanoate) and the like. Of these aliphatic polyesters, polylactic acid is preferable, and polylactic acid may be poly D-lactic acid, poly L-lactic acid, or a mixture thereof.

  As the easily soluble polyester polymer, for example, when immersed in a 2% sodium hydroxide aqueous solution at 100 ° C. at a bath ratio of 1:30, for example, within 60 minutes, preferably within 45 minutes, more preferably within 30 minutes, Particularly preferred is an alkali-soluble polyester that dissolves (decomposes) almost completely within 15 minutes.

  When a water-soluble thermoplastic polyvinyl alcohol polymer is used as the B polymer component, the polyvinyl alcohol polymer used has a viscosity average polymerization degree of 200 to 500 and a saponification degree of 90 to 99.99 mol% (preferably 95 -99 mol%), a polyvinyl alcohol having a melting point of 160-230 ° C. is preferable, and it may be a homopolymer or a copolymer. From the viewpoint of melt spinnability, water solubility, and fiber properties, ethylene, It is preferable to use a copolymerized polyvinyl alcohol modified with 0.1 to 20 mol% (preferably 5 to 15 mol%) of an α-olefin having 4 or less carbon atoms such as propylene.

  As the water-soluble thermoplastic polyvinyl alcohol polymer, for example, when immersed in hot water at 100 ° C. at a bath ratio of 1:30, for example, within 60 minutes, preferably within 50 minutes, more preferably within 30 minutes, especially A thermoplastic polyvinyl alcohol polymer that dissolves (decomposes) almost completely within 15 minutes is preferred.

(Manufacturing method of composite fiber)
In addition, the composite fiber of the present invention can be made into a fiber using a conventionally known composite spinning device as long as the combination of the A polymer component and the B polymer component is determined. It can be produced by any spinning method such as a method of drawing after melt spinning at a low speed or a medium speed, a method of direct spinning and spinning at a high speed, and a method of drawing and false twisting simultaneously or subsequently after spinning.

  In the composite fiber of the present invention, the composite ratio of the component A polymer and the component B polymer is preferably such that A: B is 90:10 to 40:60 (mass ratio), more preferably 85:15 to 60:40. (Mass ratio), and the ratio of the two may be adjusted according to the fiber shape. If the component A is too much, the fiber forming processability, in particular, the occurrence of sticking after fiberizing and winding, may deteriorate the process passability of product production. On the other hand, when there are too many B components, there exists a possibility that the favorable wear feeling to the human body which is aimed at a product cannot be obtained.

  In the cross-section of the conjugate fiber of the present invention, the B component does not need to cover the entire fiber surface, but in order to ensure the winding processability of fiberization, the handleability after winding, and the processability of product production, In the fiber cross section, it is important that the A component is the core and the B component covers 70% or more of the total circumference of the A component, more preferably 80% or more, more preferably 90% or more. It is particularly preferred.

  The composite form of the present invention may be a concentric type, an eccentric type, or a multi-core type as long as the B component can be dissolved and removed by alkali treatment, water treatment, etc., and the A component does not crack. A core-sheath type composite structure in which the A component is a core component and the B component is a sheath component as shown in FIG. 1, and a composite structure in which the B component is intermittently covered around the A component as shown in FIG. A composite structure in which the B component covers the triangular A component as shown in FIG. In addition, the fiber cross-sectional shape of the component A may be a circular cross-sectional shape, or may be an irregular cross-sectional shape such as a triangle, a flat shape, or a multi-leaf type. Further, it is possible to provide a hollow portion inside the component A as shown in FIG. 4, and there is no problem even if it has various cross-sectional shapes such as a hollow shape such as a hollow with a single hole or a hollow with two or more holes. Among these, the composite fiber preferably has a core-sheath type composite structure in which the A component is a core component and the B component is a sheath component.

  The single fiber fineness of the conjugate fiber of the present invention can be appropriately set according to the purpose, and is not particularly limited, and can be selected, for example, from a range of 0.3 to 50 dtex (preferably 0.3 to 40 dtex). . However, from the viewpoint of improving the fit to the human body, those of 0.3 to 10 dtex (preferably 0.3 to 5 dtex) are preferable. In the composite fiber of the present invention, a fiber having a fineness of 6 dtex or less can be obtained while preventing yarn breakage. These fibers can be used not only as long fibers but also as short fibers or shortcuts.

  The composite fiber of the present invention obtained as described above can be used as various fiber assemblies (fiber structures). Here, examples of the fiber assembly include various woven and knitted fabrics and fabrics such as nonwoven fabrics.

  In addition, the final product (namely, polyurethane elastomer fabric) used with respect to a human body can be obtained by removing B component normally from these fiber assemblies.

  For example, in such a polyurethane elastomer fabric, a preparation step for preparing the conjugate fiber, a conjugate fiber fabric production step for producing a fabric composed of conjugate fibers using the fiber, and a component B from the fabric. And a removal step of obtaining a polyurethane elastomer fabric by removal.

  The composite fiber fabric may be formed of the composite fiber of the present invention alone, but a woven or knitted fabric or non-woven fabric made of a part of the composite fiber of the present invention, such as natural fiber, chemical fiber, synthetic fiber, etc. It may be a cross-woven fabric with other fibers such as a fiber, a blended yarn, a woven or knitted fabric used as a blended yarn, a blended cotton nonwoven fabric, or the like. For example, when used in combination with other fibers, the proportion of the component A of the composite fiber of the present invention in the woven or knitted fabric or nonwoven fabric may be, for example, 14% by mass or more, preferably 15% by mass or more, preferably It may be 18% by mass or more, more preferably 23% by mass or more. When used as a blended yarn or a blended yarn, the proportion of the component A in the yarn may be, for example, 14 to 95% by mass, preferably 20% by mass or more, preferably 30% by mass or more, and more preferably. 40 mass% or more may be sufficient.

The polyurethane elastomer fabric obtained by removing the B component from the composite fiber fabric by alkali treatment, water treatment, etc. has an excellent fit to the dynamic movement of the human body because the glass transition temperature is close to the human body surface. ing.
Moreover, the single fiber fineness of the polyurethane elastomer fiber which comprises a fabric can be made into the range of 0.3-50 dtex (preferably 0.3-40 dtex), for example by using the composite fiber used by this invention. When the fineness is reduced, it is possible to obtain a fineness fiber of 0.3 to 10 dtex, preferably 0.3 to 5 dtex.

  The composite fiber fabric or the polyurethane elastomer fabric may be subjected to a raising process such as raising a needle cloth or other finishing process, if necessary, after passing through the fabric forming step.

  The peak value of the dynamic dynamic loss tangent (tan δ) of the polyurethane elastomer fabric is, for example, 0.2 or more and 1. It may be 0 or less, preferably 0.3 or more and 0.8 or less, and more preferably 0.4 or more and 0.7 or less. In addition, as described above, such a fabric preferably contains the A component at a specific ratio (for example, 14% by mass or more).

  EXAMPLES Hereinafter, although an Example demonstrates this invention concretely, this invention is not limited at all by this. In addition, unless otherwise indicated, the part and% in an Example are related with mass.

Example 1
As component A, SMP MM-3520 (manufactured by SMP Technologies, Tg = 35 ± 3 ° C., bifunctional diisocyanate having a molecular weight of 160 to 310, bifunctional polyol having a molecular weight of 400 to 2000, 1,4 butanediol diol, Are blended at a molar ratio of 2.00 to 1.10: 1.00: 1.00 to 0.10 and polymerized by a prepolymer method), while the molecular weight as component B Using a polyethylene terephthalate having an intrinsic viscosity [η] of 0.52 obtained by copolymerizing 8% by mass of polyethylene glycol of 2000 and 5 mol% of 5-sodium sulfoisophthalic acid, the compound ratio of component A and component B is 3: 1 by mass. Each was melted with a separate extruder, and the composite fiber shown in the cross section shown in FIG. 1 was discharged from the composite spinning nozzle.

Next, after the yarn discharged from the spinneret was cooled by a horizontal blowing type cooling air device having a length of 1.0 m, it was continuously installed at a position of 1.3 m from directly below the spinneret and an inner diameter of 1.0 m. After introducing into a 30 mm tube heater (inner wall temperature: 180 ° C.) and drawing in the tube heater, an oil agent is applied to the fiber coming out of the tube heater, and subsequently at a take-up speed of 3000 m / min via a roller. The composite fiber of 111 dtex / 24 filament was manufactured by winding.
The fiberization and knitting processability was good and no problem. A circular knitted fabric was prepared from the obtained composite fiber using a circular knitting machine (28 gauge). After scouring this knitted fabric, it was immersed for 30 minutes in an alkaline aqueous solution (liquid temperature 100 ° C.) having a potential soda of 20 g / L and a bath ratio of 1:30, and the B component was selectively dissolved and removed. The obtained knitted fabric had a good wearing feeling.

[B component coverage in fiber cross section]
For 10 randomly selected filaments from the fiber cross-sectional photograph, the length of the fiber coating part of each filament is measured to obtain the percentage (coverage) of the coating part length with respect to the fiber cross-sectional circumference, and the average of the coverage of each filament The value was determined.

[Spinnability evaluation]
Evaluation was made based on the occurrence of fluff and breakage when spinning 100 kg, and the occurrence of fluff and breakage when 1 kg of spinning yarn was unwound.
◎: No fluff or yarn breakage during spinning, no fluff or yarn breakage during unwinding ○: No fluff or yarn breakage during spinning, no fluff or yarn breakage during unwinding Fluff / breakage during spinning is less than 2 times, occurrence of fluff / breakage during unwinding is recognized less than 5 times x: Fluff / breakage during spinning is 3 times or more, fluff / breakage during unwinding Over 6 occurrences

[Evaluation of knitting properties]
The evaluation was based on the occurrence of fluff and yarn breakage during 10 kg knitting.
◎: Good with no fluff / breakage ○: Good with less than 2 occurrences of fluff / breakage △: Over 2 to less than 5 occurrences of fluff / breakage x: Over 6 occurrences of fluff / breakage

[Evaluation of wearing feeling]
The feeling of wearing of the obtained knitted fabric was subjected to sensory evaluation by 10 panelists. In the sensory evaluation, each panelist evaluated that the wearing feeling was 2 points, the excellent feeling was 1 point, and the wearing feeling was inferior 0 points, and the total score was calculated to evaluate the wearing feeling.
◎: Total score is 15 points or more ○: Total score is 11-14 points △: Total score is 7-10 points ×: Total score is 6 points or less

(Example 2)
Except that the ratio of the A component and the B component of the composite fiber was changed as shown in Table 1, fiberization and knitting were made and evaluated in the same manner as in Example 1.
The fiberization / knitting processability of the composite fiber was good, and the obtained knitted fabric had an excellent wearing feeling.

(Example 3)
Fibrosis and creation and evaluation of knitted fabric were performed in the same manner as in Example 1 except that polylactic acid (Cargill Dow, 6200D) was used as the B component of the fiber.
The fiberization / knitting processability of the composite fiber was good, and the obtained knitted fabric had an excellent wearing feeling.

Example 4
As the A component, the same polymer as in Example 1 was used, and as the B component, thermoplastic modified polyvinyl alcohol (manufactured by Kuraray Co., Ltd., degree of saponification: 98.5, ethylene content: 8.0 mol%, degree of polymerization: 380), and the spinning oil was fiberized in the same manner as in Example 1 except that a water-free antistatic agent component and a smoothing agent component were used. It was created. Thereafter, the knitted fabric was treated in hot water at 100 ° C. with a bath ratio of 1:30 for 40 minutes to dissolve and remove the component B.
The fiberization / knitting processability of the composite fiber was good, and the obtained knitted fabric maintained a good wearing feeling.

(Examples 5-6)
Except that the cross-sectional shape of the fiber was changed as shown in Table 1, fiberization and knitting were performed and evaluated in the same manner as in Example 1.
In Examples 5 to 6, fiber formation was performed using a modified nozzle for the spinneret.
In any case, the fiberization / knitting processability was good, and the obtained knitted fabrics had an excellent wearing feeling.

(Comparative Example 1)
It implemented by the method similar to Example 1 except not having used B component shown in Table 1. FIG. The fiberization processability was poor, and the resulting knitted fabric did not have a good wearing feeling.

(Comparative Example 2)
It implemented by the method similar to Example 1 except having used A component shown in Table 1, and not using B component. The fiberization processability was poor, and the resulting knitted fabric did not have a good wearing feeling.

(Comparative Example 3)
Example 1 except that the A component and the B component are compound-spun in a side-by-side manner, and the A component is the core and the B component covers 50% of the total circumference of the A component in the fiber cross section. It implemented by the same method. The obtained fiber was inferior in spinnability and knitting property, and the obtained knitted fabric did not have a good wearing feeling.

(Comparative Example 4)
Although it implemented by the method similar to Example 1 except not using B component shown in Table 1, it was a fiber formation process property defect. Furthermore, cotton spun yarn 20/1 was used as a blended yarn and blended with a normal single-covered yarn production device. However, the process was unsuccessful due to poor unwinding due to sticking, and the resulting knitted fabric had a good wearing feeling. Did not have.

(Comparative Example 5)
Although it implemented by the method similar to Example 1 except not using B component shown in Table 1, it was a fiber formation process property defect. Furthermore, nylon 6 filament 33T12 was used as a blended yarn, and blending was carried out with a normal single covered yarn production device. However, the process was unsuccessful due to poor unwinding due to sticking, and the resulting knitted fabric had a good wearing feeling. I did not.

  In the case of long fibers, the main use of the conjugate fiber of the present invention can be used as a clothing material in which a woven or knitted fabric or the like is produced singly or in part to develop a good wearing feeling. Such a material for clothing is particularly suitable for a field where a feeling of wearing close to human skin is required as an inner material. On the other hand, in the case of short fibers, they can be used as garment staples, dry nonwoven fabrics, wet nonwoven fabrics, and the like, and are in the range of 15 to 50 ° C, preferably 15 to 45 ° C, more preferably 15 to 35 ° C. Because of its high nature, it can be used not only for clothing but also for non-clothing applications such as cleaning fabrics, filter materials, various living materials, and industrial materials.

  As described above, the preferred embodiment of the present invention has been described. However, those skilled in the art will readily consider various changes and modifications within the obvious scope by looking at the present specification. Accordingly, such changes and modifications are to be construed as within the scope of the invention as defined by the appended claims.

Claims (7)

A polyurethane elastomer (component A) having a glass transition temperature in the range of 25 ° C. to 45 ° C . ;
A readily soluble thermoplastic polymer (component B) composed of at least one selected from a readily soluble polyester and a copolymerized polyvinyl alcohol modified with an α-olefin,
The composite ratio (mass ratio) of the A component and the B component is A: B = 90: 10-60: 40,
A composite fiber in which the A component is the core and the B component covers 70% or more of the total circumference of the A component in the fiber cross section.   The composite fiber according to claim 1, wherein the copolymerized polyvinyl alcohol is a copolymerized polyvinyl alcohol modified with an α-olefin having 4 or less carbon atoms.   The composite fiber according to claim 1 or 2, wherein the single fiber fineness is 0.3 to 50 dtex. The composite fiber having a core-sheath structure according to any one of claims 1 to 3 , wherein the A component is a core component and the B component is a sheath component. A preparation step of preparing the conjugate fiber according to any one of claims 1 to 4 ,
Using the composite fiber, a composite fiber fabric production process for producing a fabric composed of the composite fiber;
A removal step of removing the component B from the fabric to obtain a polyurethane elastomer fabric,
A process for producing a polyurethane elastomer fabric. A polyurethane elastomer fabric produced by the method of claim 5 . The polyurethane elastomer cloth according to claim 6, wherein the single fiber fineness of the polyurethane elastomer fiber constituting the cloth is 0.3 to 50 dtex.

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