KR20170095806A - Moisture absorbent core sheath composite yarn - Google Patents

Abstract

A hygroscopic core-sheath composite yarn excellent in durability, wherein the initial polymer is polyamide and the core is a thermoplastic polymer, has a moisture absorptive and desorptive property (DELTA MR) of 5.0% or more, and a DELTA MR retention rate of 20% or more after washing of 90% or more and 100% or less. The present invention provides a core-sheath composite fiber having high hygroscopicity, superior comfort over natural fibers, hygroscopic laundry durability capable of withstanding yarn use, and fastness to dyeing.

Description

[0001] MOISTURE ABSORBENT CORE SHEATH COMPOSITE YARN [0002]

The present invention relates to a hygroscopic core-sheath composite yarn excellent in washing durability.

Synthetic fibers made of a thermoplastic resin such as polyamide or polyester are widely used for medical applications and industrial applications because of their excellent strength, chemical resistance and heat resistance.

In particular, polyamide fibers have excellent hygroscopicity in addition to their unique softness, high tensile strength, coloring property upon dyeing, and high heat resistance, and are widely used for innerwear and sportswear. However, the polyamide fiber has insufficient hygroscopicity compared to natural fibers such as cotton, has a problem of stiffness and stickiness, and is inferior to natural fibers in terms of comfort.

Synthetic fibers which exhibit excellent moisture absorptive and desorptive properties for preventing a sultry feeling or sticking from such backgrounds and have a comfort similar to those of natural fibers are demanded mainly for inner use and sports medical use.

Thus, a method of adding a hydrophilic compound to a polyamide fiber has been generally studied most. For example, Patent Document 1 proposes a method of improving moisture absorption performance by blending polyvinylpyrrolidone as a hydrophilic polymer with polyamide and spinning it.

On the other hand, studies have been actively conducted to achieve both a hygroscopic performance and mechanical properties by using a core-sheath structure of the fiber structure and a core-sheath structure of a highly hygroscopic thermoplastic resin as a core portion and a thermoplastic resin having superior mechanical properties as an initial portion.

For example, Patent Document 2 discloses a core-sheath composite fiber comprising a core portion and a nodule portion, wherein the core portion is not exposed to the surface of the fiber, wherein a polyether block amide copolymer having a hard segment of 6-nylon is used as a core portion, A core-sheath composite fiber having an area ratio of deep portion and nodal portion in a fiber cross section of nylon resin as an initial portion is 3/1 to 1/5.

Patent Document 3 discloses a core-sheath type conjugate fiber comprising a thermoplastic resin as a core part and a fiber-forming polyamide resin as an initial part, wherein the main component of the thermoplastic resin forming the core part is a polyetheresteramide, Discloses a core-sheath type conjugate fiber excellent in hygroscopicity, which is 5-50 wt% of the total weight of the fibers.

Patent Document 4 discloses a hygroscopic and hygroscopic composite fiber characterized in that a core component is a thermoplastic water absorbent resin comprising a crosslinked product of a polyamide or a polyester and a polyethylene component.

Patent Document 5 discloses an antifouling agent in which a core portion is a polyether block amide copolymer and a fiber-forming polymer such as polyamide or polyester is used as a primer and the core portion is exposed at an exposure angle in a range of 5 to 90 degrees. A core-sheath composite cross-section fiber excellent in performance, absorption performance, and contact cold feeling is described.

Further, Patent Document 6 discloses a method for producing a polylactic acid copolymer having a hydrophilic component such as a polyether ester amide compound or a polyether ester compound as a core part, a fiber-forming polymer such as polyester as a core, Composite fibers are described.

As a technique for improving the hygroscopicity of a polyamide fiber, there has been proposed a method in which a hydrophilic compound is attached to the fiber surface by post-processing to penetrate the fiber surface. However, a method for improving the hygroscopic performance by post- There is a problem that the hygroscopic performance deteriorates.

Japanese Patent Application Laid-Open No. 9-188917 International Publication No. 2014/10709 Japanese Unexamined Patent Application Publication No. 6-136618 Japanese Patent Laid-Open No. 8-209450 International Publication No. 2008/123586 Japanese Patent Application Laid-Open No. 2000-239918

However, although the fiber described in Patent Document 1 has a moisture absorptive and desorptive property close to that of natural fibers, its performance can not be sufficiently satisfied, and it is a problem to achieve higher moisture absorptive and desorptive properties.

Further, the core-sheath conjugated fibers of Patent Documents 2 to 6 have a moisture absorbing and desorizing property equal to or higher than that of the natural fibers, but the core portion is deteriorated by the use of the repeated yarn, and the problem of deterioration of moisture absorption performance by repeated use is a problem. In addition, since the high-moisture-resisting polymer of the deep portion has a polymer structure that facilitates the entry and exit of the dye, there is a drawback that the fastness to dyeing is poor.

Further, in the core-sheath conjugated fiber described in Patent Document 2, nylon 6 is used for the nodule in terms of contact cold feeling, but there is no difference from general nylon 6, and it is a further problem to achieve contact cold feeling. The core-sheath conjugated fiber described in Patent Document 5 uses a water-insoluble polyethylene oxide-modified product at the core portion with respect to the contact cold feeling. However, since the cold feeling due to the polymer moisture absorption performance of the core portion is low and is covered with the polyamide at the beginning, There is no difference from ordinary polyamides, and it is a problem to achieve further contact cold feeling. In the core-sheath conjugated fiber described in Patent Document 6, new dry touch feeling is obtained by increasing the contact area with the skin and increasing the hygroscopic performance by flattening the cross section of the fiber, So that contact cold feeling was obtained as compared with general polyester, but it was deteriorated as compared with general polyamide. Even when polyamide is used as the initial portion, new dry touch feeling can be obtained by increasing the contact area with the skin and the synergistic effect of the moisture absorption performance. However, the performance is not sufficiently satisfactory, It is an assignment.

The present invention overcomes the problems of the prior art to overcome the problems of the prior art, and has a high hygroscopicity and a cold sensibility in contact with each other, so that it is superior in comfort over natural fibers, washing durability, dye fastness, And to provide a core-sheath composite yarn having durability.

In order to solve the above-described problems, the present invention has the following configuration.

(1) A core-sheath composite yarn wherein the initial polymer is polyamide and the core is a thermoplastic polymer, and the moisture absorption and desorptivity (DELTA MR) is 5.0% or more and the DELTA MR retention ratio after 20 times of washing is 90% or more and 100% or less.

(2) The core-sheath composite yarn described in (1), wherein the fastness to washing is between 3 and 5.

(3) The core-sheath composite yarn according to (1) or (2), wherein the initiator polymer is a polyether ester amide copolymer, wherein the crystalline orientation parameter of the polyamide is 1.9 or more and 2.7 or less, and wherein the core thermoplastic polymer is a polyetheresteramide copolymer.

Core-sheath composite yarn according to any one of the above ^{5 mol / g 8.0 × 10 -5 mol} / g or less (1) - (3) ^- (4) 3.5 terminal amino group amount of the core-sheath composite's sheath polymer × 10.

(5) The core-sheath composite yarn according to any one of (1) to (4), wherein the flatness is not less than 1.5 and not more than 5.0.

(6) The core-sheath composite yarn according to any one of (1), (2) and (4), wherein the inorganic particles are contained in an amount of 0.1 to 5% by weight in the entire fibers.

(7) The core-sheath composite yarn according to (6), wherein the? -Crystal orientation parameter of the polymer at the beginning is 1.7 or more and 2.6 or less.

(8) The core-sheath composite yarn according to (6) or (7), wherein the initial polymer contains 0.2 to 6% by weight of inorganic particles.

(9) The core-sheath composite yarn according to any one of (6) to (8), wherein the inorganic particles are titanium oxide.

(10) A fabric with at least a core-sheath composite yarn according to any one of (1) to (9).

According to the present invention, a core-sheath composite yarn having high hygroscopicity and contactlessness, superior in comfort over natural fibers, hygroscopic performance in durability and durability, and durability in contact and cold sensation, .

1 is a schematic view showing a core-sheath composite yarn having an I-shaped cross-sectional shape, which is a preferred embodiment of the present invention.
Fig. 2 is a schematic view showing a core-sheath composite yarn having a convex lens-like cross-sectional shape as a preferred form of the present invention.

The core-sheath composite yarn according to the present invention is a core-sheath composite yarn wherein the core polymer is polyamide and the core portion is a thermoplastic polymer and has a moisture absorptive and desorptive capacity (DELTA MR) of 5.0% or more and a DELTA MR retention ratio of 90% or more and 100% or less after 20 cycles of washing.

The core-sheath composite yarn according to the present invention uses a polyamide at the beginning and a thermoplastic polymer at the core.

As the thermoplastic polymer, a known polymer can be used, but a thermoplastic polymer having particularly high moisture absorption performance is preferable. The thermoplastic polymer having a high hygroscopicity of the core part means a polymer having a moisture absorptive and desorptive property (DELTA MR) of 10% or more as measured in a pellet shape, and includes a polyetheresteramide copolymer, polyvinyl alcohol and a cellulose thermoplastic resin. Among them, a polyetheresteramide copolymer is preferable from the viewpoints of heat stability, compatibility with polyamide in the initial part, and excellent peeling resistance.

The polyetheresteramide copolymer is a block copolymer having an ether bond, an ester bond and an amide bond in the same molecular chain. More specifically, it is possible to use one or more polyamide component (A) selected from lactam, aminocarboxylic acid, diamine and dicarboxylic acid salt, and polyether component composed of dicarboxylic acid and poly (alkylene oxide) glycol Is a block copolymer polymer obtained by subjecting an ester component (B) to a polycondensation reaction.

Examples of the polyamide component (A) include lactams such as ε-caprolactam, dodecanolactam and undecanolactam, ω-aminocarboxylic acids such as aminocaproic acid, 11-aminoundecanoic acid and 12- There are nylon salts of diamine-dicarboxylic acids which are precursors such as acid, nylon 66, nylon 610 and nylon 612, and the preferred polyamide-forming component is epsilon -caprolactam.

Here, the polyetherester component (B) is composed of a dicarboxylic acid having 4 to 20 carbon atoms and a poly (alkylene oxide) glycol. Examples of the dicarboxylic acid having 4 to 20 carbon atoms include aliphatic dicarboxylic acids such as succinic acid, glutaric acid, adipic acid, pimelic acid, suberic acid, sebacic acid and dodecadic acid, terephthalic acid, isophthalic acid, Aromatic dicarboxylic acids such as naphthalene dicarboxylic acid, and alicyclic dicarboxylic acids such as 1,4-cyclohexanedicarboxylic acid. These may be used singly or in combination of two or more. Preferred dicarboxylic acids are adipic acid, sebacic acid, dodecadic acid, terephthalic acid, isophthalic acid. Examples of the poly (alkylene oxide) glycol include polyethylene glycol, poly (1,2- and 1,3-propylene oxide) glycol, poly (tetramethylene oxide) glycol, poly (hexamethyleneoxide) And polyethylene glycol having particularly good moisture absorption performance is preferable.

The number average molecular weight of the poly (alkylene oxide) glycol is preferably from 300 to 10,000, more preferably from 500 to 5,000. When the specific gravity is 300 or more, it is difficult to scatter in the out-of-system during the polycondensation reaction, which is preferable because the fiber exhibits stable moisture absorption performance. If it is 10000 or less, a homogeneous block copolymer can be obtained, which is preferable because the preparation is stable.

The constituent ratio of the polyetherester component (B) in the polyetheresteramide copolymer is preferably in a molar ratio of 20 to 80% of the entire copolymer. When it is 20% or more, it is preferable because good hygroscopicity is obtained. If it is 80% or less, it is preferable because good dyeing fastness and washing durability can be obtained.

As such a polyetheresteramide copolymer, Arkema Inc. "MH1657" and "MV1074" are commercially available.

Examples of the polyamide of the beginning portion include nylon 6, nylon 66, nylon 46, nylon 9, nylon 610, nylon 11, nylon 12, nylon 612, or compounds having an amide forming functional group with them, for example, laurolactam, , Terephthalic acid, isophthalic acid, 5-sodium sulfoisophthalic acid, and the like. Among them, nylon 6, nylon 11, nylon 12, nylon 610 and nylon 612 have a small difference in melting point from the polyetheresteramide copolymer and can suppress thermal degradation of the polyetheresteramide copolymer during dissolution and spinning , And is preferable from the standpoint of reproducibility. Above all, nylon 6 is preferably dyed.

It is more preferable that the polyamide of the present invention contains a hygroscopic agent in view of improving hygroscopicity. Examples of the moisture absorber include polyvinyl pyrrolidone, polyether amide, polyalkylene glycol, polyether ester amide and the like, with polyvinyl pyrrolidone being particularly preferred. The polymerization degree of polyvinyl pyrrolidone is preferably in the range of 20 to 70 as K value. The K value mentioned here is the relative viscosity number obtained by measurement of the capillary viscometer using the relative viscosity of the aqueous solution of polyvinylpyrrolidone, and is the so-called Fikentscher's K value (DIN53726). This value correlates with the molecular weight of polyvinylpyrrolidone and is conventionally used to measure the molecular weight of polyvinylpyrrolidone. When the K value is 20 or more, entanglement with the polyamide molecular chain becomes strong, and a fiber having stable moisture absorptive and desorptive properties is obtained. On the other hand, if the K value is 60 or less, it is preferable from the viewpoint of production by suppressing the thickening upon polyamide coating. And more preferably in the range of 20 to 60. [

The content of polyvinylpyrrolidone is preferably 3 to 7% by weight based on the amount of the polyamide. By setting the content to 3% by weight or more, water can be quickly moved from the skin to the fiber side at the time of wearing, so that a feeling of dryness can be imparted. When the content is 7% by weight or less, it is possible to provide a medical treatment having excellent washing fastness and strength to withstand practical use.

The polyamide of the present invention includes various additives such as a chlorinating agent, a flame retardant, an antioxidant, an ultraviolet absorber, an infrared absorber, a nucleating agent, a fluorescent whitener, an antistatic agent, carbon, etc. in an amount of 0.001 to 10 wt% % Of the total weight of the composition.

The core-sheath composite yarn of the present invention has a function of controlling the humidity in the clothes in order to obtain good comfort at the time of wearing. Humidity index of clothing as represented by 30 占 폚 占 90% RH when a light-to-heavy or light to medium exercise is carried out as an index of humidity adjustment, and a moisture absorption rate in the outside air temperature and humidity represented by 20 占 폚 占 65% (ΔMR) indicated by the car is used. The larger the? MR, the higher the hygroscopic performance and the better the comfort during wearing.

The core-sheath composite yarn of the present invention preferably has an? MR of 5.0% or more. , More preferably not less than 7.0%, still more preferably not less than 10.0%, still more preferably not less than 15.0%. By setting this range, it is possible to suppress the sultry feeling and the sticking of the wearer at the time of wearing, and it is possible to provide medical treatment with excellent comfort. In addition, the level of? MR that can be achieved in the present invention is about 17.0%.

The moisture absorptive and desorptive property (ΔMR) of 5.0% or more can be achieved by using a polymer having a ΔMR of 10% or more measured in a pellet shape.

The core-sheath composite yarn of the present invention preferably has a retention ratio of DELTA MR after washing 20 times from 90% to 100%. More preferably, it is 95% or more and 100% or less. By setting this range, washing durability that can withstand practical use is obtained, and medical treatment with excellent comfort can be provided. Also, it is possible to provide medical care having excellent durability and comfort that can withstand practical use when DELTA MR is not less than 5.0% and that the maintenance ratio of DELTA MR is 20% or more after 20 washing cycles.

It is possible to make the retention ratio of DELTA MR after washing 20 times to 90% or more and 100% or less by optimizing the alpha crystal orientation parameter of the polyamide of the beginning portion to be described later.

By setting the DELTA MR of the core-sheath composite yarn of the present invention to such a range, it becomes possible to exhibit antistatic performance with little winding-up and dust adhesion when worn by static electricity. In other words, since the thermoplastic polymer having a high hygroscopicity at the core portion is continuously arranged in the fiber axis direction, it is possible to develop an antistatic mechanism using moisture in the air and to produce a low temperature and low humidity environment (for example, RH), a good electrification performance can be obtained.

It is preferable that the core-sheath composite yarn of the present invention has a frictional electrification voltage of 0 V or more and 1500 V or less under the environment of 20 캜 x 40% RH. More preferably 0 V or more and 1000 V or less. The lower the frictional voltage, the better the antistatic performance. However, the frictional voltage, which is the friction surface of a general polyamide fiber under an environment of 20 ° C × 40% RH, is about 4500 to 5500V. With such a range, it is possible to provide a medical treatment having excellent anti-electrifying performance with less adherence and dust adhesion when worn by static electricity, that is, excellent in comfort.

The core-sheath composite yarn of the present invention preferably has a washing fastness (discoloration and discoloration) of from 3 to 5. By setting this range, washing durability that can withstand practical use can be obtained, and medical treatment with excellent dyeing fastness can be provided.

The washing fastness (discoloration and discoloration) of the tertiary to the tertiary or lower levels can be achieved by optimizing the α-crystal orientation parameter of the polyamide of the initial portion and the amino terminal group of the starting polymer to be described later.

It is preferable that the core-sheath composite yarn of the present invention has an α crystal orientation parameter of the polyamide of the beginning portion of 1.9 to 2.7, and the core thermoplastic polymer is a polyether ester amide copolymer. The polyamide at the beginning portion is preferably a crystalline α crystal in a stable crystal form, and the α crystal is formed when a high stress is applied. In order to achieve such a range, as described later, the polyamide is radiated at a specific condition (such as a composition ratio or viscosity ratio of core roots), and by preferentially applying the initial portion of the polyamide between the drawing at the take- It becomes possible to make the? -Type crystal having a stable crystal form present in the starting portion. As a result, the dyeing strength of the core-sheath composite yarn after dyeing is increased, and the dyeing fastness is improved. Further, the stretching force at the time of spinning is concentrated on the polyamide at the beginning, and crystallization of the thermoplastic polymer having a high hygroscopic property at the core portion is inhibited, thereby increasing the hygroscopic performance of the core-sheath composite yarn.

When the core thermoplastic polymer is a polyether ester amide copolymer, it is easy to form a structure in which the polyether ester component is localized by crystallization and the durability to the alkaline liquid is poor in the local part, By controlling the parameter in this range, it is possible to suppress the crystallization of the polyetheresteramide copolymer in the core portion, thereby exhibiting the durability of washing with hygroscopicity that can withstand practical use.

When the? crystal orientation parameter is not less than 1.9, the crystallization of the polyamide at the beginning proceeds and the dyeing fastness as a composite yarn is good, and the crystallization of the thermoplastic polymer in the core portion having a high moisture absorbing performance at the core portion does not progress, . In addition, in the case of the polyetheresteramide copolymer, the crystallization does not proceed, and the durability of the hygroscopicity that can withstand practical use is improved. On the other hand, if the? Crystal orientation parameter is 2.7 or less, the crystallization of the polyamide at the beginning does not proceed, and generation of yarn breakage or fluff at the time of spinning can be suppressed, and productivity is improved. More preferably 2.00 or more and 2.60 or less, and still more preferably 2.05 or more and 2.60 or less.

The core-sheath composite yarn of the present invention preferably has an amino terminal group content of 3.5 x 10 ^-5 mol / g and not more than 8.0 x 10 ^-5 mol / g of the initiator polymer. Hydrophilic-rich amino-terminal technique is 3.5 × 10 ^- not less than ⁵ mol / g, the absorption performance becomes high is preferable, and also the amino end groups since the dye seating is obtained suitable color development and color fastness to medical applications. On the other hand, the amino terminus amount is 8.0 × 10 ^- is less than ⁵ mol / g, it is preferable that the fiber is difficult to dye stain at the time of dyeing. And more preferably from 4.2 × 10 ^- a ⁵ mol / g or less, still more preferably more than 4.5 × 10 ^{-5 mol / g 8.0 × 10 -5 mol} / g or less ^- than ⁵ mol / g 8.0 × 10.

Since the core-sheath composite yarn of the present invention uses a thermoplastic polymer having a high hygroscopic property at the core portion, the thermal conductivity can be increased, and the contact cold feeling can be more easily expressed than the polyamide single yarn. The contact coldness depends on the heat flux per unit area in which the heat accumulated by the skin side moves to the fiber on the low temperature side immediately after the fiber contacts the skin. Polyamide is an organic material and has a relatively low thermal conductivity, so even if it is worn directly on the skin as a garment, the feeling of contact coldness is not felt. In order to raise the contact cold feeling to a more realistic feel, it is desirable to provide a medical device which has a cross-sectional shape with a large contact area and contains an additive having a high thermal conductivity, .

The core-sheath composite yarn of the present invention preferably has a cross-sectional shape of the core-sheath composite yarn flat and a flatness of 1.5 to 5.0.

Since the contact cold feeling depends on the heat flux per unit area, the amount of heat to be moved depends on the contact area, so that the I-type (FIG. 1) or the convex lens sectional shape (FIG. 2) In the shape, the flatness is preferably 1.5 or more. Here, the flatness means the ratio of the circumscribed circle diameter (R in Figs. 1 and 2) to the diameter of the inscribed circle (r in Figs. 1 and 2). The higher the flatness is, the more effective the contact coldness is, and the more preferable the flatness is 2.0 or more. On the other hand, as the flatness increases, the yarn strength tends to decrease, and the flatness needs to be 5.0 or less.

The core-sheath composite yarn of the present invention preferably contains 0.1 to 5% by weight of the inorganic particles in the entire fiber. Since the accumulated heat on the skin side moves to the fiber on the low temperature side immediately after the fiber comes into contact with the skin, the contact cold feeling contains 0.1-5 wt% of the inorganic compound having a high thermal conductivity and a low heat capacity as compared with the polyamide .

The reason for selecting the inorganic compound in the present invention is that it does not adversely affect the production of the core-sheath composite yarn or dyeing, maintains the actual physical properties, and does not cause coloration or the like in the polymer when the light resistance or the like is used. So long as such an adverse effect is not given to the core-sheath composite yarn. Examples of inorganic compounds having a high thermal conductivity and a low heat capacity as compared with polyamides include barium sulfate, titanium oxide, aluminum oxide, zirconium oxide, calcium oxide, magnesium oxide, aluminum nitride, boron nitride, zirconium nitride, aluminum silicate, zirconium carbide And the like. Among these inorganic compounds, barium sulfate, titanium oxide, magnesium oxide and aluminum oxide are preferable in view of fiber properties, coloring ability, ease of handling of inorganic particles, and high order formability.

When the content of the inorganic compound is too small, it is difficult to increase the thermal conductivity because it is difficult to increase the contact cold feeling. Therefore, the content of the inorganic compound is preferably 0.1 wt% or more. In addition, although the higher the contact cold feeling can be, the lower the tensile strength, which is the actual physical property, is lowered and the higher order formability is lowered. More preferably from 0.3 to 3% by weight. More preferably 0.3 to 2.0% by weight.

As described above, the contact cold feeling depends on the heat flux accumulated on the skin side immediately after the fibers come into contact with the skin to move to the fibers on the low temperature side. In the case of the core-sheath composite yarn of the present invention, immediately after the core-sheath composite yarn comes into contact with the skin, the accumulated heat amount on the skin side moves to the beginning of the low-temperature side core-sheath composite yarn and then to the beginning portion of the low- Do. Since the polyamide at the initial portion has a low thermal conductivity, the heat transfer to the core portion of the polyether ester amide copolymer polymer is not smoothly performed, in addition to the fact that the contact cold feeling is not felt even if it is directly worn on the skin as a garment.

Therefore, it is preferable that the initial polyamide contains 0.2 to 6% by weight of an inorganic compound having a high thermal conductivity and a low heat capacity as compared with the polyamide. With this configuration, the heat from the skin is quickly transferred to the core-sheath composite yarn when worn, and the heat transfer from the polyamide at the beginning of the core-sheath composite yarn to the polyether ester amide copolymer polymer at the core deep portion is smooth And the contact cold feeling is broken. The larger the content of the inorganic compound is, the higher the contact cold feeling can be. However, from the viewpoint of the effect of contact cold feeling, the preparation property, the physical properties, etc., the content is more preferably 0.2 to 3 wt%.

The core-sheath composite yarn containing the inorganic particles of the present invention in an amount of 0.1 to 5 wt% in the entire fibers preferably has an? -Type crystal orientation parameter of the initial polyamide of 1.7 to 2.6. The? -Form crystal of the polyamide at the beginning is a stable crystal form, and? -Form crystals are formed when high stress is applied in the production of the core-sheath composite yarn. In order to achieve such a range, as described later, the polyamide is radiated at a specific condition (such as a composition ratio or viscosity ratio of core roots), and by preferentially applying the initial portion of the polyamide between the drawing at the take- It becomes possible to make the? -Type crystal having a stable crystal form present in the starting portion.

By setting the? Crystal orientation parameter of the polyamide at the beginning of the range to be within this range, the dyeing strength after dyeing of the core-sheath composite yarn is increased and the dyeing fastness is improved. In addition, the stretching force at the time of spinning is concentrated in the polyamide at the beginning, Crystallization of the ether ester amide copolymer polymer is suppressed, resulting in a core-sheath composite yarn excellent in moisture absorption performance and contact cold feeling. In addition, it is possible to suppress the crystallization of the polyetheresteramide copolymer in the core part, to suppress the generation of the localized structure due to crystallization of the polyetherester component in the core part, and to be able to maintain the durability against the alkaline liquid So that it is possible to maintain the hygroscopic performance and the contact cold feeling even when washed.

When the? -Crystal orientation parameter of the polyamide at the beginning is 1.7 or more, the crystallization of the polyamide at the beginning proceeds and the dyeing fastness of the core-sheath composite yarn is improved, and the crystallization of the polyetheresteramide copolymer at the core is not progressed, The contact cold feeling becomes good. Further, since the crystallization of the polyetheresteramide copolymer in the core part does not progress, it becomes possible to maintain the hygroscopic performance and the contact cold feeling even when washed. On the other hand, if the? -Type crystal orientation parameter of the polyamide at the beginning is 2.6 or less, the crystallization of the polyamide at the beginning does not progress, and the breakage of the yarn and the occurrence of fluff at the time of high- More preferably from 1.8 to 2.5, still more preferably from 1.85 to 2.5.

The core-sheath composite yarn of the present invention preferably has a tensile strength of 2.5 cN / dtex or more. More preferably 3.0 cN / dtex or more. With this range, it is possible to provide a medical treatment with excellent strength that can withstand practical use, mainly in medical applications such as inner medical applications and sports medical applications.

The core-sheath composite yarn of the present invention preferably has an elongation of 35% or more. And more preferably 40 to 65%. By setting this range, the processability in the higher-order process such as weaving, knitting, and twisting is improved.

The total fineness and the number of filaments of the core-sheath composite yarn of the present invention are not particularly limited. Considering that they are used as medical filamentary fibers, the total fineness as multifilament is 5 dtex to 235 dtex and the filament count is 1 to 144 filaments .

The core-sheath composite yarn of the present invention can be obtained by a known melt spinning method or composite spinning method.

For example, a polyamide (superstructure) and a thermoplastic polymer (deep portion) having high hygroscopicity are respectively melted and metered and transported by a gear pump, and a composite flow is formed so as to take a core- And the cooling air is blown by a yarn cooling device such as a chimney so as to cool the yarn to room temperature and refuel with the oil supply device and to be converged and entangled with the first fluid entangling nozzle device and passed through the take- And at that time, stretching is performed in accordance with the ratio of the main speed of the take-up roller to the stretching roller. Further, the yarn is thermally set by a stretching roller, and wound by a winder (winding device).

In order to set the? -Type crystal orientation parameter of the core part of the core-sheath composite yarn of the present invention within such a range, it is possible to control the core sheath composite ratio at the time of spinning, the viscosity of the core-

The core portion of the core-sheath composite yarn of the present invention needs to be 20 parts by weight to 80 parts by weight with respect to 100 parts by weight of the composite yarn. More preferably 30 parts by weight to 70 parts by weight. With such a range, proper stretching can be applied to the polyamide of the beginning portion. In addition, good dyeing fastness and moisture absorption performance can be obtained. If it is less than 20 parts by weight, sufficient moisture absorption performance can not be obtained. On the other hand, when the amount exceeds 80 parts by weight, cracking of the fiber surface due to swelling is likely to occur under a hydrothermal atmosphere such as dyeing, excessive stretching is applied to the polyamide at the beginning, I will not. In addition, spinning and stretching, which generate excessive tension, are linked to the occurrence of yarn breakage and fluff formation, which is not desirable in order to stably produce a desired fiber.

The polyamide chips used in the beginning of the present invention should have a relative sulfuric acid viscosity of 2.3 to 3.3. And preferably 2.6 or more and 3.3 or less. With such a range, proper stretching can be applied to the polyamide of the beginning portion. When the relative viscosity of sulfuric acid is not less than 2.3, practically usable yarn strength is obtained and optimal stretching is applied, so that the crystallization of the polyamide of the beginning portion proceeds and the? -Type crystal orientation parameter becomes an appropriate value, It is preferable. On the other hand, if the relative viscosity of the sulfuric acid is 3.3 or less, since the melt viscosity is suitable for spinning, the thermoplastic polymer having a high hygroscopicity of the deep portion can be produced at a suitable spinning temperature.

The chip of the thermoplastic polymer having high hygroscopicity for use in the core part of the present invention preferably has a relative viscosity of 1.2 or more and 2.0 or less as an orthochlorophenol relative viscosity. When the relative viscosity of the orthochlorophenol is 1.2 or more, the initial stretching is applied to the initial portion, the crystallization of the polyamide of the beginning portion proceeds, the? -Type crystal orientation parameter becomes an appropriate value, and yarn breakage and fluff become difficult to occur Do. On the other hand, when the relative viscosity of orthochlorophenol is 2.0 or less, excessive stretching is not applied to the core portion, crystallization of the polyamide at the beginning is proceeded, and the? -Type crystal orientation parameter becomes an appropriate value and dye fastness is improved.

In the drawing step, the spinning conditions are set so that the product of the draw ratio, which is the value of the main speed ratio between the take-up roller and the drawing roller, is 3300 m / min to 4500 m / min at the yarn speed desirable. More preferably from 3500 m / min to 4500 m / min, further preferably from 4000 m / min to 4500 m / min. This numerical value indicates the total elongation amount of the polymer discharged from the nipping roller from the nipping discharge line speed to the take-up roller main speed and from the main roller speed of the take-up roller to the main speed of the drawing roller. With such a range, proper stretching can be applied to the polyamide of the beginning portion. At 3300 m / min or more, crystallization of the polyamide at the initial portion proceeds and the dyeing fastness is improved, and the thermoplastic polymer having a high hygroscopic property at the deep portion does not proceed crystallization, and the hygroscopic performance tends to be improved. On the other hand, at a rate of 4500 m / min or less, the crystallization of the polyamide at the beginning portion proceeds appropriately, so that not only a predetermined degree of crystallization can be attained, but also breakage of the yarn and generation of fluff are minimized.

In the lubrication process, it is preferable that the radial emulsion imparted by the oil supply device is a non-hydrodynamic emulsion. The thermoplastic polymer having a high moisture absorptive capacity at the deep portion is a polymer having a ΔMR of 10% or more and is excellent in hygroscopicity. Therefore, when a non-hydrotreated emulsion is added, it slowly absorbs moisture in the air, .

In the core-sheath composite yarn of the present invention, the content of the inorganic particles is preferably 0.1 to 5% by weight in the entire fibers. In order to control the inorganic particles to such a range, it is possible to control by adding inorganic particles to either or both of the polyamide of the initial portion and the polyether ester amide copolymer of the deep portion.

In order to increase the contact cold feeling, it is necessary to increase the amount of heat accumulated on the skin side immediately after contact with the skin of the core-sheath complex to the core of the core-sheath composite yarn on the low-temperature side and then to the core of the core- desirable. That is, it is preferable to add inorganic particles to the polyamide of the beginning portion. In this case, it is preferable that the initial polyamide contains 0.2 to 6% by weight of the inorganic particles. By setting this range, the heat from the skin can be rapidly transferred to the core-sheath composite yarn when worn, and the heat transfer from the polyamide at the beginning of the core-sheath composite yarn to the polyether ester amide copolymer polymer at the core portion is smooth, It is possible to keep the contact cold feeling even if it is washed. The larger the content of the inorganic particles in the core part is, the higher the contact cold feeling can be, but the content is more preferably 0.2 to 3 wt% from the viewpoint of the effect of contact cold feeling, higher order formability and physical properties.

Further, as a method for containing inorganic particles at a high concentration and uniformly in a thermoplastic polymer (deep part) such as polyamide (sheath) or polyether ester amide copolymer, a method of blending inorganic particles into pellets and melting them, A method in which inorganic pellets are added to a polymer in a molten state and kneaded, a method in which inorganic particles are added to a raw material or a reaction system before or during polymerization of the polymer, and the like However, in order to suppress secondary aggregation of the inorganic particles added at a high concentration and uniformly disperse them, a method of adding inorganic particles during polymerization of the polymer is particularly preferable.

The core-sheath composite yarn of the present invention is excellent in moisture absorption performance and contact cold feeling, and thus can be preferably used for medical products. The form of the fabric can be selected according to the purpose such as a fabric, a knitted fabric, and a nonwoven fabric. As described above, the larger the? MR is, the higher the hygroscopic performance is, and the better the comfort at the time of wearing, the better. Therefore, the coiling of the core-sheath composite yarn of the present invention can be provided by providing the core yarn composite yarn of at least a part of the present invention with excellent comfort by adjusting the core yarn composite yarn of the present invention so that? MR becomes 5.0% or more. Further, as described above, the contact cold feeling corresponds to the fact that heat transfer is performed smoothly immediately after the fibers come into contact with the skin. Therefore, by designing the warp and weft composite yarn of the present invention to come into contact with the skin, it is possible to provide medical treatment with excellent comfort. As clothes, various medical products such as innerwear and sportswear can be used.

Example

Hereinafter, the present invention will be described in more detail by way of examples. The measurement method of the characteristic value in the embodiment is as follows.

(1) Relative viscosity of sulfuric acid

0.25 g of a sample was dissolved in an amount of 1 g per 100 ml of sulfuric acid having a concentration of 98 wt%, and a dropping time (T1) at 25 캜 was measured using an Ostrobette viscometer. Subsequently, the dropping time (T2) of sulfuric acid alone at a concentration of 98 wt% was measured. The ratio of T1 to T2, that is, T1 / T2, was referred to as a relative sulfuric acid viscosity.

(2) Relative viscosity of orthochlorophenol

0.5 g of the sample was dissolved in 100 ml of orthochlorophenol in an amount of 1 g, and the dropping time (T1) at 25 캜 was measured using an Ostrobette viscometer. Subsequently, the dropping time (T2) of only orthochlorophenol was measured. The ratio of T1 to T2, that is, T1 / T2, was referred to as a relative sulfuric acid viscosity.

(3) K value

Polyvinylpyrrolidone is used as an aqueous solution having a concentration of 1%, and the relative viscosity thereof is measured and found by the equation of Fikentscher.

logZ = C [75k2 ^/ (1 + 1.5kC) + k]

Where Z is the relative viscosity of the aqueous solution of concentration C, k is the K value x 10 ^-3 , and C is the aqueous solution concentration (%).

(4) Fineness

A loop sample was prepared by setting a fiber sample to a 1.125 m / s caliper and rotating at 200 rpm, drying with a hot-air drier (105 ± 2 ° C × 60 minutes), weighing the sludge with a flat pile, The fineness was calculated from the value. In addition, the process water content of the core compound was 4.5%.

(5) Strength and elongation

Textile samples were obtained from Orientech Co. Ltd. Tensilon ", UCT-100 under JIS L1013 (chemical fiber filament yarn test method, 2010). The elongation was obtained from the elongation at the point showing the maximum strength in the tensile strength-elongation curve. In addition, the strength was called the strength by dividing the maximum strength by the fineness. The measurement was carried out ten times, and the average value was called strength and elongation.

(6) Cross-sectional shape

Paraffin, stearic acid, and ethylcellulose, and after introducing the core-sheath composite yarn, solidified by leaving at room temperature, and cutting the yarn in the cross-section in the direction of the cross section. (CS5270) manufactured by Mitsubishi Electric Corporation, and a color video processor (SCT-CP710, manufactured by Mitsubishi Electric Corporation) was used for the 10 core yarn composite yarns (10 yarn counts for all yarn counts) ), The flatness was calculated according to the following method with respect to the entire single yarn, and the average value was referred to as the flatness of the yarn.

Flatness = diameter of circumscribed circle (R) / diameter of inscribed circle (r).

(7)? Crystal orientation parameter

The fiber sample laser Raman measurement by spectrometry, and 1120cm ^- strength in parallel to the polarization of the Raman bands derived from the α crystal of nylon identified at ¹ ratio (I1120) parallel) and the intensity ratio (I1120) in the vertical polarization V) , Thereby obtaining the orientation degree evaluation parameter. In addition, a small anisotropy to the alignment CH byeongak ^band-by based on the intensity of the Raman band (near 1440cm ¹⁾ had a normalized scattering intensity of each polarized light conditions (parallel / vertical).

? crystal orientation parameter = (I1120 / I1440) parallel / (I1120 / I1440) vertical.

Samples for orientation measurement were sectioned by a microtome after resin molding (bisphenol-based epoxy resin, curing for 24 hours). The slice thickness was 2.0 탆. The section samples were cut at a slight inclination from the fiber axis so that the cut surface was elliptical, and the points where the thickness of the elliptical minor axis became a certain thickness were selected and measured. The measurement is performed in the brown rice mode, and the spot diameter of the laser at the sample position is 1 占 퐉. The orientation of the core and the center of the layer was analyzed, and the orientation was measured under the polarizing condition. The degree of alignment was evaluated from the ratio of the Raman band intensities obtained when the polarization direction coincided with the fiber axis under the parallel condition and when the polarization direction was perpendicular to the fiber axis, respectively. Further, n = 3 was measured for each measurement point. The detailed conditions are shown below.

Laser Raman spectroscopy

Device: T-64000 (Joobin Yvon / Atago Bussan)

Condition: Measurement mode; Brown rice Rahman

objective; × 100

Beam diameter; 1 탆

Light source; Ar + laser / 514.5 nm

Laser power; 50mW

Diffraction grating; Single 600gr / mm

Slit; 100 탆

Detector; CCD / Joobin Yvon 1024x256.

(8) Amino terminal functionality of the initiator polymer chip

1 g of the sample was dissolved in 50 mL of a phenol / ethanol mixed solution (phenol / ethanol = 80/20) at 30 DEG C to dissolve the solution, and this solution was neutralized with 0.02 N hydrochloric acid to obtain the amount of 0.02 N hydrochloric acid . Further, only the phenol / ethanol mixed solvent (the same amount as above) was neutralized with 0.02N hydrochloric acid, and the amount of 0.02N hydrochloric acid consumed was determined. The amount of the amino terminal group per 1 g of the sample was obtained from the tea.

(9) Amino terminal capacity of the initial polymer of core compound

A. Measurement of weight percentage

Paraffin, stearic acid, and ethylcellulose, and after introducing the core-sheath composite yarn, solidified by leaving at room temperature, and cutting the yarn in the cross-section in the direction of the cross section. (CS5270), and the color video processor (SCT-CP710) manufactured by Mitsubishi Electric Corporation was applied to 10 core yarn composite yarns selected arbitrarily among the yarn yarns (when all yarn counts are 10 or less) , The cross-sectional photograph printed out at a magnification of 1500 times was cut into an initial portion and a deep portion, and the weight was measured and calculated by the following formula.

Weight ratio of the initial portion = (weight of the initial portion / weight of the initial portion + weight of the deep portion)) x 100

B. Amino terminal functionality of the core compound

The amount of amino terminal groups was determined by the method described in (8) above.

C. Amino terminal functionality of the terminal polymer

And the amount of the amino terminal group obtained in the above B was multiplied by the weight ratio of the initial portion obtained in the above A to calculate.

The amino end group concentration of the initiator polymer

= Amount of amino terminal group of core-sheath composite yarn x weight ratio of initial portion / 100.

(10) Production of ordinary letters

A. Production of ordinary letter

And the stitch density was adjusted to be 50 with a knitting machine. When the fineness degree of fineness of the fibers is low, the total fineness of the filaments normally fed to the knitting machine is suitably set to be 50 to 100 dtex. When the total fineness exceeds 100 dtex, And the stitch density was adjusted to be 50 in the same manner.

B. Regular letter refinement

100 ml of an aqueous solution of 2 g / l of a nonionic surfactant (NOIGEN SS, manufactured by DKS Co. Ltd.) was prepared in the ordinary letter obtained in A above, washed at 60 DEG C for 30 minutes, washed with running water for 20 minutes , Dehydrated with a dehydrator, and dried.

C. Typical letter staining

The ordinary letters obtained in A and B above were dyed using the following dyes and dyeing preparations.

Acid dye: Eriony Blue A-R 2.0 mass%

Dyeing aid: Acetic acid 1.5%

The dyed bath containing the acid dye and dyeing auxiliary was dyed for 45 minutes at an atmospheric pressure set at 98 DEG C, washed with running water for 20 minutes, dehydrated with a dehydrator, and air-dried.

(11) Color development

Typical letter (10) The colorability of a letter after dyeing obtained by C was evaluated in the following four steps.

S: The whole color is uniformly thick.

A: All the colors are uniformly colored (pale ~ hyper color) to hyper color

B: uniformly pigmented as a whole in a pale to middle color (pale to hyperchromic)

C: The whole color is uniformly pale.

(12) Moisture Absorption and Desorption (ΔMR)

Normally, the weight of the letter (10) A is weighed to 1 to 2 g in a weighing bottle, held at 110 캜 for 2 hours, dried (W0), and then the object substance is maintained at 20 캜 and 65% Then weigh the weight (W65). Then, this is maintained at 30 DEG C and 90% relative humidity for 24 hours, and the weight is measured (W90). Then, calculation was made according to the following expression.

MR1 = [(W65-W0) / W0] x100% (1)

MR2 = [(W90-W0) / W0] x100% (2)

? MR = MR2-MR1 (3)

(13) ΔMR after washing

Normal letter (10) A was washed repeatedly 20 times by the method described in No. 103 of JIS L0217 (1995), Table 1, and moisture absorptive and desorptive properties of the substrate were measured and calculated.

When ΔMR was 5.0% or more, it was judged that good comfort was obtained at the time of wearing.

(14) DELTA MR maintenance rate after washing

The ΔMR retention after washing as an index of change of ΔMR before and after washing was calculated by the following formula.

DELTA MR after washing / DELTA MR before washing

When the DELTA MR retention ratio is 90% or more, it is determined that the laundry is durable.

(15) Wash fastness

Dyeing trade letter (10) C was measured under A-2 condition in Table 7 according to JIS L0844 (2011) 7.1 A method. Judgment was made based on the visual acuity method of paragraph 10 (a) of JIS L0801 (2011). When all of the discoloration and discoloration judgments are equal to or more than grade 3, the selected color is acceptable, and when at least one of the discoloration or discoloration judgments is 2 to 3 or less, the dye fastness is said to be rejected.

(16) Overall evaluation

Wash fastness, DELTA MR after washing, and DELTA MR retention after washing were evaluated and evaluated in the following three stages.

S: Wash fastness of all three items of grade 4 or more for fading and pollution determination, ΔMR of 7.0% or more after washing, and ΔMR retention rate of 95% or more after washing.

A: Wash fastness of all three items above grade 3 for fading and staining, ΔMR of 5.0% after washing, and ΔMR retention after washing of 90% or more.

C: At least one item among 3 items of washing fastness change fading and pollution judging is less than 2-3 grade, ΔMR is less than 5.0% after washing, and ΔMR retention rate is less than 90% after washing.

S and A are said to be excellent because of their superior comfort over natural fibers and their excellent durability to withstand yarn use.

(17) Contact cold sensibility (q-max)

The contact cold sensibility was evaluated by a cold sensation evaluation value (q-max) obtained by cold sensation measurement using a Thermo Labo IIB type precision thermophysical property measuring device KES-F7 (manufactured by Kato Tech. Co., Ltd.). The q-max value is a value (unit: W / cm 2) in which heat is accumulated in a copper plate, and the peak value of the heat flow in which the accumulated heat moves to the sample object on the low-temperature side immediately after contact with the sample surface is measured.

(10) A and a device (KES-F7 THERMO LABO IIB TYPE (manufactured by Kato Tech. Co., Ltd.)) are allowed to stand in a room with a room temperature of 20 ° C. and a relative humidity of 60% for one day and a night. To heat the T-BOX (temperature detection and low temperature plate), which is in contact with the knitted fabric and measure the amount of heat, 10 ° C higher than the room temperature, the heat plate BT plate is set at 30 ° C. Set the hot heating plate G-BT to 20.3 ° C and stabilize it. Placed on the back of the green cloth (facing the skin at the time of wearing) a normal knitted fabric with its face up, and the T-BOX was quickly loaded onto the knitting usually, and q-max was measured. In addition, the weight per unit area (g / cm 2) of the normal knitting was calculated by measuring the weight by cutting the normal knitting of the measuring portion to 10 cm square.

In this measuring method, it was determined that when the q-max was 0.175 (W / cm2) or more, good comfort was obtained at the time of wearing.

(18) Contact cool sensibility after washing (q-max) Maintenance rate

(10) A was repeatedly washed 20 times by the method described in No. 103 of JIS L0217 (1995), Table 1, and the contact cold sensibility of the substrate was measured. The q-max retention after washing as an index of change in contact coldness before and after washing was calculated by the following formula.

(Q-max after washing) / (q-max before washing) x 100

When the q-max retention ratio was 90% or more, it was judged that the laundry was durable.

(19) Antistatic

(10) A was measured according to JIS L1094 (charging test method for fabric and knitted fabric, 2014) method A (half-life measuring method) and method B (frictional electromotive force measuring method). The environmental conditions were 20 占 폚 占 40% RH and the frictional force was measured in the plane (calico No. 3) and the longitudinal direction.

When the frictional withstand voltage was 1500 V or less, it was judged that a good electrification performance was obtained at the time of wearing.

(20) Antistatic property after washing

The normal letter (10) A was washed 20 times repeatedly by the method described in No. 103 of the JIS L0217 (1995), Table 1, and the antistatic property of the substrate was measured.

[Example 1]

A polyether ester amide copolymer (Arkema Inc.) in which the polyamide component is nylon 6, the polyether component (poly (alkylene oxide) glycol) is polyethylene glycol having a molecular weight of 1500, and the component ratio of the polyether component is about 76%. claim, MH1657, o-chlorophenol relative viscosity: 1.69) was deep, and a relative viscosity of 2.71, terminal amino group amount of sulfuric acid 5.95 × 10 ^- by a nylon 6 ⁵ mol / g to the sheath, and melted at 270 ℃, concentric And the cord / sec ratio (weight part) = 50/50 was released from the core seam composite nip (24 holes). Further, the amount of the amino terminal group was adjusted with hexamethylenediamine and acetic acid at the time of polymerization.

At this time, the number of revolutions of the gear pump was selected so that the total fineness of the obtained core-sheath composite yarn was 56 decitex, and the discharge amount was set at 22 g / min. Then, the yarn was cooled and solidified by a yarn cooling apparatus, lubricated with a non-tropic emulsion by a lubricator, entangled by a first fluid entangling nozzle apparatus, primary speed of a first roller, The main roll of the second roll was stretched at a speed of 4210 m / min. The roll was set at 150 캜 for heat setting. The winding speed was increased to 4000 m / min to obtain a core-sheath composite yarn of 56 decitex 24 filaments. Table 1 shows the physical properties of the obtained fibers.

The obtained core-sheath composite yarn had an extremely high moisture absorption performance of 12.4% in ΔMR. In addition, the fastness to discoloration and discoloration of the wash fastness were all in the fourth grade, the ΔMR after washing was 12.4%, and the ΔMR retention after washing was 100%. That is, the fabric obtained by using the obtained core-sheath composite yarn and the medical products obtained the comfortable medical treatment excellent in durability against washing that can be practically used.

In addition, the q-max was 0.170 W / cm 2, the q-max after washing was 0.170 W / cm 2, and the q-max retention after washing was 100%.

In addition, a frictional electromotive force of 800 V under the environment of 20 ° C × 40% RH and a frictional electrification voltage of 800 V after washing were obtained, and a pleasant medical treatment excellent in electrification performance with excellent durability to be able to withstand practical use was obtained.

[Example 2]

The same procedure as in Example 1 was carried out except that the primary roll of the first roll was wound at 2381 m / min, the primary roll of the second roll at 3571 m / min, and the winding speed at 3500 m / Core sheath composite yarn was obtained. Table 1 shows the physical properties of the obtained fibers.

The obtained core-sheath composite yarn had an extremely high moisture absorption performance of 11.6%. In addition, all of the wash fastness change discoloration and discoloration judgments were in the order of 3-4, the ΔMR after washing was 11.1%, and the ΔMR retention after washing was good at 95.7%.

[Example 3]

The same procedure as in Example 1 was carried out except that the primary roll of the first roll was wound at 2245 m / min, the primary roll of the second roll at 3367 m / min, and the winding speed at 3300 m / Core sheath composite yarn was obtained. Table 1 shows the physical properties of the obtained fibers.

The obtained core-sheath composite yarn had an extremely high moisture absorption performance of 10.8%. Also, all of the wash fastness change discoloration and discoloration determination were grade 3, DELTA MR after washing was 9.9%, and DELTA MR retention after washing was good at 91.7%.

[Example 4]

The same procedure as in Example 1 was carried out except that the primary roll of the first roll was wound at 4474 m / min, the primary roll of the second roll at 4474 m / min, and the winding speed of 4250 m / Core sheath composite yarn was obtained. Table 1 shows the physical properties of the obtained fibers.

The obtained core-sheath composite yarn had an extremely high moisture absorbing performance of 13.1%. In addition, all of the wash fastness of discoloration and discoloration were in the 4-5 grade, the DELTA MR after washing was 13.1%, and the DELTA MR retention after washing was 100%.

[Example 5]

A core-sheath composite yarn of 56 decitex 24 filaments was obtained in the same manner as in Example 1, except that the core / sheath ratio (weight portion) was 30/70. Table 1 shows the physical properties of the obtained fibers.

The obtained core-sheath composite yarn had a moisture absorption performance as high as 7.5%. In addition, all of the wash fastness change discoloration and discoloration determination were in the order of 3-4, the DELTA MR after washing was 7.2%, and the DELTA MR retention after washing was 96.0%.

In addition, a frictional electrification voltage of 850 V and a frictional electrification voltage of 850 V in the environment of 20 캜 x 40% RH were obtained, and a pleasant medical treatment excellent in electrification performance with excellent durability to withstand practical use was obtained.

[Example 6]

Core yarn composite yarn of 56 dtex 24 filaments was obtained in the same manner as in Example 1 except that the core / yarn ratio (weight portion) was 20/80. Table 2 shows the physical properties of the obtained fibers.

The obtained core-sheath composite yarn had a sufficient moisture absorption performance of 5.9% as DELTA MR. In addition, the wash fastness of discoloration and discoloration were all 3-4, ΔMR after washing was 5.5%, and ΔMR retention after washing was 93.2%.

[Example 7]

Core yarn composite yarn of 56 decitex 24 filaments was obtained in the same manner as in Example 1, except that the core / yarn ratio (weight portion) was set to be 70/30. Table 2 shows the physical properties of the obtained fibers.

The obtained core-sheath composite yarn had an extremely high hygroscopicity of ΔMR of 15.1%. In addition, all of the wash fastness change discoloration and discoloration judgments were in the order of 3-4, the DELTA MR after washing was 15.0%, and the DELTA MR retention after washing was good at 99.3%.

[Example 8]

A core-sheath composite yarn of 56 dtex 24 filaments was obtained in the same manner as in Example 1 except that the core / sheath ratio (weight portion) was 80/20.

Table 2 shows the physical properties of the obtained fibers.

The obtained core-sheath composite yarn had an extremely high hygroscopic performance of 16.9% in ΔMR. In addition, the wash fastness of the third grade in both discoloration and discoloration determination, ΔMR after washing was 16.7%, and ΔMR retention after washing was good at 99.4%.

[Example 9]

The sulfuric acid relative viscosity of 2.40, terminal amino group amount is 3.95 × 10 ^{- 5} mol / g of the nylon 6 in the same manner as in Example 1 except that emitted by a sheath to obtain a core-sheath composite yarn of 56 dtex 24 filament. Table 2 shows the physical properties of the obtained fibers.

The obtained core-sheath composite yarn had an extremely high moisture absorption performance of 11.1% in ΔMR. Further, all of the wash fastness change discoloration and discoloration determination were grade 3, DELTA MR after washing was 10.1%, and DELTA MR retention after washing was 90.1%.

[Example 10]

The sulfuric acid relative viscosity of 2.63, terminal amino group amount is 5.20 × 10 ^{- 5} mol / g of the nylon 6 in the same manner as in Example 1 except that emitted by a sheath to obtain a core-sheath composite yarn of 56 dtex 24 filament. Table 2 shows the physical properties of the obtained fibers.

The obtained core-sheath composite yarn had an extremely high moisture absorption performance of 12.0% as DELTA MR. In addition, the fastness to discoloration and discoloration of the wash fastness were all in the fourth grade, the DELMR after washing was 11.6%, and the DELTA MR retention after washing was 96.7%.

[Example 11]

The sulfuric acid relative viscosity of 3.30, terminal amino group amount is 4.78 × 10 ^{- 5} mol / g of the nylon 6 in the same manner as in Example 1 except that emitted by a sheath to obtain a core-sheath composite yarn of 56 dtex 24 filament. Table 3 shows the physical properties of the obtained fibers.

The obtained core-sheath composite yarn had an extremely high moisture absorbing performance of 13.1%. The wash fastness of the wash fastness was all in the 4-5 grade, and the ΔMR after washing was 13.1%, and the ΔMR retention after washing was 100%.

[Example 12]

The sulfuric acid relative viscosity of 2.63, terminal amino group amount is 7.40 × 10 ^{- 5} mol / g of the nylon 6 in the same manner as in Example 1 except that emitted by a sheath to obtain a core-sheath composite yarn of 56 dtex 24 filament. Table 3 shows the physical properties of the obtained fibers.

The obtained core-sheath composite yarn had an extremely high moisture absorption performance of 12.7% in ΔMR. In addition, all of the wash fastness of discoloration and discoloration were all in the 4-5 grade, the DELMR after washing was 12.2%, and the DELTA MR retention after washing was 96.1%.

[Example 13]

The sulfuric acid relative viscosity of 2.63, terminal amino group amount is 4.15 × 10 ^{- 5} mol / g of the nylon 6 in the same manner as in Example 1 except that emitted by a sheath to obtain a core-sheath composite yarn of 56 dtex 24 filament. Table 3 shows the physical properties of the obtained fibers.

The obtained core-sheath composite yarn had an extremely high moisture absorption performance of 11.5%. In addition, all of the wash fastness change discoloration and discoloration determination were grade 3, DELTA MR after washing was 10.5%, and DELTA MR retention after washing was good at 91.3%.

[Example 14]

A core-sheath composite yarn of 56 decitex-68 filaments was obtained in the same manner as in Example 1, except that the concentric core-seam composite seam was made into 68 holes, and the primary speed of the first roll, Table 3 shows the physical properties of the obtained fibers.

The obtained core-sheath composite yarn had an extremely high moisture absorbing performance of 13.6%. In addition, all of the washing fastness change discoloration and discoloration determination was grade 4, DELTA MR after washing was 13.6%, and DELTA MR retention after washing was 100%.

[Example 15]

A core-sheath composite yarn of 56 decitex-68 filaments was obtained in the same manner as in Example 5, except that the concentric core-seam composite seam was made into 68 holes, and the primary speed of the first roll, i.e., the take-up roller was 3508 m / min. Table 3 shows the physical properties of the obtained fibers.

The obtained core-sheath composite yarn had an extremely high hygroscopic performance of 8.3% in ΔMR. In addition, all of the wash fastness change discoloration and discoloration judgments were in the order of 3-4, the ΔMR after washing was 7.9%, and the ΔMR retention after washing was good at 95.2%.

[Example 16]

A nylon 6 having a relative viscosity of 2.71 and a relative viscosity of 2.71 (20% by weight) of polyvinylpyrrolidone ("LUBISCOL" K30SP manufactured by BASF Corp., K value = 30) , And a cordierite composite yarn of 56 decitex 24 filaments was obtained in the same manner as in Example 1, except that the nylon 6 blend polymer, which had been chip-blended so as to have a polyvinylpyrrolidone addition rate of 3.3 wt% Table 4 shows the physical properties of the obtained fibers.

The obtained core-sheath composite yarn had an extremely high hygroscopic performance of 13.3% in ΔMR. In addition, the fastness to discoloration and discoloration of the wash fastness were all in the fourth grade, ΔMR after washing was 13.3%, and ΔMR retention after washing was 100%. That is, the fabric obtained by using the obtained core-sheath composite yarn can provide a comfortable medical treatment excellent in durability against washing, which can withstand practical use. In addition, by containing polyvinylpyrrolidone as a moisture absorbent in the initial portion, not only the moisture absorption performance was improved but also the moisture from the skin was quickly transferred from the skin to the fiber side in the worn state, .

[Example 17]

Nylon 6 having a relative viscosity of 2.71 and an additive-free nylon 6 having a relative viscosity of 2.71, which was obtained by adding 20 wt% of polyvinylpyrrolidone ("LUBISCOL" K30SP manufactured by BASF Corp., K value = 30) , And a core-sheath composite yarn of 56 decitex 24 filaments was obtained in the same manner as in Example 1 except that chip blending was performed so that the addition ratio of polyvinylpyrrolidone was 6.7 wt%. Table 4 shows the physical properties of the obtained fibers.

The obtained core-sheath composite yarn had an extremely high moisture absorbing performance of 13.6%. In addition, the fastness to discoloration and discoloration of the wash fastness were all in the fourth grade, ΔMR after washing was 13.6%, and ΔMR retention after washing was 100%.

[Comparative Example 1]

The sulfuric acid relative viscosity of 2.15, terminal amino group amount is 4.70 × 10 ^{- 5} mol / g of the nylon 6 by the same manner as Example 1 except that the spinning method as sheath component to obtain a core-sheath composite yarn of 56 dtex 24 filament. Table 5 shows the physical properties of the obtained fibers.

The DELTA MR of the obtained core-sheath composite yarn had an extremely high hygroscopic performance of 10.5%, but the DELTA MR retention after washing was 73.3% and did not have the durability of washing with hygroscopic performance capable of enduring practical use. In addition, the fastness to discoloration and discoloration of the fastness to washing were all in the 2-3 classes, and the fastness to dyeing was deteriorated. That is, it can be seen that the fabric and the medical article using the obtained core-sheath composite yarn do not have the washing durability (hygroscopicity, dyeability) that can withstand practical use. In addition, the frictional electrification voltage under the environment of 20 캜 x 40% RH was 1000 V, but the frictional electrification voltage after washing was 1700 V, and the electrostatic discharge performance deteriorated. That is, it can be seen that the fabric and the medical article using the obtained core-sheath composite yarn are susceptible to sticking and dusting when worn under a low-temperature low-humidity environment, resulting in deterioration in comfort.

[Comparative Example 2]

A core-sheath composite yarn of 56 decitex 24 filaments was obtained in the same manner as in Example 1, except that the core / sheath ratio (weight portion) was 10/90. Table 5 shows the physical properties of the obtained fibers.

In addition, the dyeing fastness of the obtained core fastness compound yarn was good in the color fastness and color fastness of the wash fastness of 3-5. In addition,? MR was 4.2%, which means that it did not have a sufficient moisture absorption performance. In addition, the DELTA MR retention after washing was 84.4%, which did not have the washing durability of hygroscopic performance that can withstand practical use. That is, it can be seen that the fabric obtained by using the obtained core-sheath composite yarn and the medical article do not have the comfort exceeding the natural fibers.

[Comparative Example 3]

A core-sheath composite yarn of 56 decitex 24 filaments was obtained in the same manner as in Example 1, except that the core / sheath ratio (weight part) was 90/10. Table 5 shows the physical properties of the obtained fibers.

The DELTA MR of the obtained core-sheath composite yarn had an extremely high hygroscopic performance of 17.8, and the maintenance ratio of DELTA MR after washing was 92.7%, and it had durability of washing with hygroscopic performance capable of enduring practical use. However, both of the color fastness to discoloration and the color dropout of the fastness to washing were in the order of 2 to 3, and the fastness to dyeing was deteriorated. That is, it can be seen that the obtained fabric and the medical article using the core-sheath composite yarn do not have the durability (dyeability) capable of enduring practical use.

In addition, during yarn picking, yarn breakage was frequent and stable spinning was difficult. Further, when the wound fiber package was observed, the occurrence of fluff was observed, and a large number of defective products were produced, and the productivity was deteriorated.

[Comparative Example 4]

The same procedure as in Example 1 was carried out except that the primary roll of the first roll was wound at 2020 m / min, the primary roll of the second roll at 3030 m / min and the winding at a winding speed of 3000 m / min. Core sheath composite yarn was obtained. Table 5 shows the physical properties of the obtained fibers.

The DELTA MR of the obtained core-sheath composite yarn had an extremely high hygroscopicity of 10.0%, but the DELTA MR retention after washing was 88.0%, which did not have the durability of washing with hygroscopic performance capable of enduring practical use. In addition, both of the color fastness to discoloration and the color dropout of the wash fastness degree were grade 2, and the fastness to dyeing was deteriorated. That is, it can be seen that the fabric and the medical article using the obtained core-sheath composite yarn do not have the washing durability (hygroscopicity, dyeability) that can withstand practical use.

[Example 18]

A polyether ester amide copolymer (Arkema Inc.) in which the polyamide component is nylon 6, the polyether component (poly (alkylene oxide) glycol) is polyethylene glycol having a molecular weight of 1500, and the component ratio of the polyether component is about 76%. claim, MH1657, o-chlorophenol relative viscosity: 1.69) was deep, and a relative viscosity of 2.71, terminal amino group amount of sulfuric acid 5.95 × 10 ^- by a nylon 6 ⁵ mol / g to the sheath, melts at 270 ℃, and dumbbell (Parts by weight) = 50/50 from the core-sheath composite seam having the discharge hole of the shape.

At this time, the number of revolutions of the gear pump was selected so that the total fineness of the obtained core-sheath composite yarn was 56 decitex, and the discharge amount was set at 22 g / min. Then, the yarn is cooled and solidified by a yarn cooling device, lubricating the non-tropic emulsion by the oil supply device, and then entangled with the first fluid entangling nozzle device. The main speed of the first roller, The main speed of the 2 roll-in stretching roller was stretched at 4210 m / min, the stretching roller was set at 150 占 폚 and the winding speed was 4000 m / min to obtain an I-shaped cross section having a flatness of 4.0 and 56 decitex 24 filaments Core sheath composite yarn was obtained. Table 6 shows the physical properties of the obtained fibers.

The obtained core-sheath composite yarn had an extremely high moisture absorption performance of 12.4% in ΔMR. In addition, the fastness to discoloration and discoloration of the wash fastness were all in the fourth grade, the ΔMR after washing was 12.4%, and the ΔMR retention after washing was 100%. In addition, the q-max was 0.183 W / cm 2, the q-max after washing was 0.183 W / cm 2, and the q-max retention after washing was 100%. That is, the fabric and the medical article using the obtained core-sheath composite yarn are excellent in hygroscopic performance and contact cold feeling, and can provide a comfortable medical treatment excellent in durability against washing.

[Example 19]

Except that the main roll was wound at 275 캜 and the main roll was wound at 2381 m / min, the main roll of the second roll at 3571 m / min, and the winding speed at 3500 m / min. , A core-sheath composite yarn having an I-shaped section with a flatness of 2.5 and 56 decitex 24 filaments was obtained. Table 6 shows the physical properties of the obtained fibers.

The obtained core-sheath composite yarn had an extremely high moisture absorption performance of 11.9% in ΔMR. In addition, all of the wash fastness change discoloration and discoloration determination were grade 3, DELTA MR after washing was 11.5%, and DELTA MR retention after washing was 97%. In addition, the q-max was 0.178 W / cm 2, the q-max after washing was 0.178 W / cm 2, and the q-max retention after washing was 100%.

[Example 20]

A core-sheath composite yarn having an I-shaped section with a flatness of 4.8, 56 decitex and 24 filaments was obtained in the same manner as in Example 18 except that it was melted and spun at 265 占 폚. Table 6 shows the physical properties of the obtained fibers.

The obtained core-sheath composite yarn had an extremely high hygroscopicity of 12.8% in ΔMR. Further, all of the wash fastness discoloration and discoloration determinations were grade 4, DELTA MR after washing was 12.8%, and DELTA MR retention after washing was 100%. In addition, the q-max was 0.186 W / cm 2, the q-max after washing was 0.186 W / cm 2, and the q-max retention after washing was 100%.

[Example 21]

The same procedure as in Example 18 was carried out except that the core-sheath compounding nozzle having a convex lens-shaped discharge hole was used and the core / sheath ratio (weight part) was 30/70, so that a flatness of 4.0 and 56 decitex 24 filaments A core-sheath composite yarn having a convex lens-shaped cross section was obtained. Table 6 shows the physical properties of the obtained fibers.

The obtained core-sheath composite yarn had an extremely high hygroscopicity of? MR of 7.5%. In addition, the wash fastness of the samples was in the order of 4-5 for both discoloration and discoloration, DELTA MR was 7.2%, and DELTA MR retention after washing was 96%. In addition, the q-max was 0.177 W / cm 2, the q-max after washing was 0.177 W / cm 2, and the q-max retention after washing was 100%.

[Example 22]

A core-sheath composite yarn having an I-shaped section with a flatness of 4.0, 56 decitex and 24 filaments was obtained in the same manner as in Example 18, except that the core / sheath ratio (weight portion) was 20/80. Table 6 shows the physical properties of the obtained fibers.

The obtained core-sheath composite yarn had an extremely high hygroscopicity of ΔMR of 5.9%. In addition, all of the wash fastness discoloration and discoloration determination were in the order of 4-5, DELTA MR after washing was 5.5%, and DELTA MR retention after washing was 93%. In addition, the q-max was 0.175 W / cm 2, the q-max after washing was 0.175 W / cm 2, and the q-max retention after washing was 100%.

[Example 23]

Except that a core-sheath compounding nozzle having a convex lens-shaped discharge hole was used, and a core / second ratio (weight part) = 70/30 was used to produce a flatness of 4.0 and 56 decitex 24 filaments A core-sheath composite yarn having a convex lens-shaped cross section was obtained. Table 7 shows the physical properties of the obtained fibers.

The obtained core-sheath composite yarn had an extremely high hygroscopicity as ΔMR of 15.2%. In addition, all of the wash fastness change discoloration and discoloration judgments were in the order of 3-4, the ΔMR after washing was 15.0%, and the ΔMR retention after washing was good at 99%. In addition, the q-max was 0.186 W / cm 2, the q-max after washing was 0.185 W / cm 2, and the q-max retention after washing was 99%.

[Example 24]

A core-sheath composite yarn having an I-shaped section with a flatness of 4.0, 56 decitex and 24 filaments was obtained in the same manner as in Example 18, except that the core / sheath ratio (parts by weight) was 80/20. Table 7 shows the physical properties of the obtained fibers.

The obtained core-sheath composite yarn had an extremely high hygroscopic performance of 17.0% for DELTA MR. In addition, all of the wash fastness change discoloration and discoloration determination were grade 3, DELTA MR after washing was 16.9%, and DELTA MR retention after washing was good at 99%. In addition, the q-max was 0.188 W / cm 2, the q-max after washing was 0.186 W / cm 2, and the q-max retention after washing was 99%.

[Example 25]

The relative viscosity of sulfuric acid of 2.40, terminal amino group amount is 3.95 × 10 ^{- 5} mol / g of flatness of nylon 6 in the same manner as in Example 18 except that emitted by a sheath 2.0 and 56 decitex having an I-shaped cross-section of the text 24 filament Core sheath composite yarn was obtained. Table 7 shows the physical properties of the obtained fibers.

The obtained core-sheath composite yarn had an extremely high moisture absorption performance of 11.1% in ΔMR. Further, all of the wash fastness change discoloration and discoloration determination were grade 3, DELTA MR after washing was 10.2%, and DELTA MR retention after washing was 92%. In addition, the q-max was 0.178 W / cm 2, the q-max after washing was 0.166 W / cm 2, and the q-max retention after washing was 93%.

[Example 26]

The relative viscosity of sulfuric acid 2.63, terminal amino group amount is 7.40 × 10 ^{- 5} mol / g of flatness of nylon 6 in the same manner as in Example 18 except that emitted by a sheath 3.0 and 56 decitex having an I-shaped cross-section of the text 24 filament Core sheath composite yarn was obtained. Table 7 shows the physical properties of the obtained fibers.

The obtained core-sheath composite yarn had an extremely high hygroscopicity of 12.1% in ΔMR. Further, all of the washing fastness change discoloration and discoloration determination were in the order of 3-4, the DELTA MR after washing was 11.5%, and the DELTA MR retention after washing was 95%.

In addition, the q-max was 0.180 W / cm 2, the q-max after washing was 0.171 W / cm 2, and the q-max retention after washing was 95%.

[Example 27]

The relative viscosity of sulfuric acid 3.30, the amino terminus amount is 4.78 × 10 ^- to a radiation to a nylon 6 ⁵ mol / g to the sheath, projection except that the detention for core-sheath composite having an ejection hole of the lens shape, as in Example 18 In the same manner, a core-sheath composite yarn having a convex lens-shaped section with a flatness of 4.5, 56 decitex and 24 filaments was obtained. Table 7 shows the physical properties of the obtained fibers.

The obtained core-sheath composite yarn had an extremely high hygroscopicity as ΔMR of 13.0%. In addition, all of the washing fastness change discoloration and discoloration were all in the 4-5 grade, the DELTA MR after washing was 13.0%, and the DELTA MR retention after washing was 100%. In addition, the q-max was 0.183 W / cm 2, the q-max after washing was 0.183 W / cm 2, and the q-max retention after washing was 100%.

[Comparative Example 5]

The relative viscosity of sulfuric acid 2.15, terminal amino group amount is 4.70 × 10 ^- to ⁵ mol / g of I-shaped cross-section of a nylon 6 the flatness in the same manner as in Example 18 except that emitted by the sheath component 1.3 and 56 dtex 24-filament Were obtained. Table 8 shows the physical properties of the obtained fibers.

The DELTA MR of the resultant core-sheath composite yarn had an extremely high moisture absorption performance of 10.6%, but the DELTA MR retention after washing was 76%, which did not have the durability of washing with hygroscopic performance capable of enduring practical use. In addition, the fastness to discoloration and discoloration of the fastness to washing were all in the 2-3 classes, and the fastness to dyeing was deteriorated.

Further, q-max was 0.165 W / cm 2, q-max after washing was 0.139 W / cm 2, and q-max retention after washing was 84%.

That is, it can be seen that the obtained fabric and the medical article using the core-sheath composite yarn do not have the durability (hygroscopicity, dyeability, and contact cold sensibility) that can withstand practical use.

[Comparative Example 6]

Sulfuric acid relative viscosity of 3.45, terminal amino group amount is 4.50 × 10 ^{- 5} mol / g of the nylon 6 to a sheath, the flatness in a manner as in Example 18 except that the radiation to melt at 280 ℃ 5.5, 56 decitex 24 filament Of I - shaped cross section. Table 8 shows the physical properties of the obtained fibers.

The DELTA MR of the resultant core-sheath composite yarn had an extremely high hygroscopicity of 13.1%, but the DELTA MR retention after washing was 80%, and did not have the durability of hygroscopicity that can withstand practical use. In addition, the fastness to discoloration and discoloration of the fastness to washing were in the 3-4 class and the 2-3 class, and the fastness to washing was deteriorated.

Further, the q-max was 0.188 W / cm 2, the q-max after washing was 0.147 W / cm 2, and the q-max retention after washing was 78%.

[Comparative Example 7]

The relative viscosity of sulfuric acid is 2.71, the amino terminus amount is 5.95 × 10 ^{- 5} mol / g of the nylon 6 to a core, and except that the yarn alone component, Examples 18 and how the flatness 4.0 and 56 dtex (I) of 24 filaments of And a core-sheath composite yarn having a cross section was obtained. Table 8 shows the physical properties of the obtained fibers.

The single component yarn thus obtained had an excellent .DELTA.MR of 2.4%. Further, all of the washing fastness change discoloration and discoloration determination were grade 5, DELTA MR after washing was 2.4%, and DELTA MR retention after washing was 100%.

However, the q-max was 0.157 W / cm 2 after washing, the q-max was 0.157 W / cm 2 after washing, and the q-max retention after washing was 100%.

[Example 28]

(Poly (alkylene oxide) glycol) is a polyethylene glycol having a molecular weight of 1,500, and the constituent ratio of the polyether component is a molar ratio (molar ratio) of the polyether component to the polyether ester amide copolymer, (Arkema Inc., MH1657, relative weight of o-chlorophenol: 1.69) having a weight average molecular weight of about 76% was used for the core part.

A nylon 6 chip having 0.3 wt% titanium oxide, a relative sulfuric acid viscosity of 2.63, and an amino terminal group amount of 5.10 x 10 ^-5 mol / g was used as the polyamide. Further, titanium oxide was added at the time of polymerization, and the amount of the amino terminal group was adjusted to hexamethylenediamine and acetic acid at the time of polymerization.

Nylon 6, which was dried until the chip moisture percentage became 0.03% by weight or less, was used as the core part and the nylon 6 dried until the chip moisture content became 0.03% by weight or less, Melted at 260 캜 in the deep part and 260 캜 in the beginning part, and melt-extruded using a spinneret for a concentric core-sheath type conjugate fiber so as to have a core-sheath ratio (parts by weight) = 50/50. In addition, the core-to-heel ratio was adjusted by the number of revolutions of the gear pump for measuring the molten polymer.

Then, the yarn is cooled and solidified by a yarn cooling device, lubricating the non-tropic emulsion by the oil supply device, and then entangled with the first fluid entangling nozzle device. The main speed of the first roller, Rolled stretching roller at a peripheral speed of 4210 m / min, heat set at a stretching roller of 150 占 폚, and wound at a winding speed of 4000 m / min to obtain a core-sheath composite fiber of 56 decitex 24 filaments.

The amount of titanium oxide in the obtained core-sheath composite fiber was 0.15% by weight. Table 9 shows the physical properties of the fibers.

The moisture absorption performance and the contact cold feeling are excellent, and even when washed, the moisture absorption performance and the contact cold feeling are maintained, and the dyeing fastness is excellent.

[Example 29]

As the polyamide, 1.8 wt% of titanium oxide, the relative viscosity sulfate 2.63, terminal amino group amount is 5.10 × 10 ^{- 5} mol / g is used instead of nylon 6 chips on a sheath, except Example 28 text 56 decitex in the same way as the 24-filament Of core-sheath composite fibers.

The amount of titanium oxide in the obtained core-sheath composite fiber was 0.9% by weight. Table 9 shows the physical properties of the fibers.

Type crystal orientation parameter is controlled so that the hygroscopicity performance and the contact cold feeling are maintained, and furthermore, the degree of dyeing It can be seen that core-sheath composite fibers having excellent fastness are obtained.

[Example 30]

As the polyamide, 5.0 wt% of titanium oxide, the relative viscosity of sulfuric acid, 2.40, terminal amino group amount is 5.90 × 10 ^{- 5} mol / g is used instead of nylon 6 chips on a sheath, except Example 28 text 56 decitex in the same way as the 24-filament Of core-sheath composite fibers.

The amount of titanium oxide in the obtained core-sheath composite fiber was 2.5% by weight. Table 9 shows the physical properties of the fibers.

The moisture absorption performance and the contact cold feeling are excellent, and even when washed, the moisture absorption performance and the contact cold feeling are maintained, and the dyeing fastness is excellent.

[Example 31]

As the polyamide, 5.0 wt% of titanium oxide, the sulfuric acid relative viscosity of 2.40, terminal amino group amount 5.90 × 10 ^{- 5} mol / g of using nylon 6 chips on a sheath, and core-sheath ratio (parts by weight) = 30 / A with 70 , Core-sheath conjugated fiber of 56 decitex 24 filaments was obtained in the same manner as in Example 28. [

The amount of titanium oxide in the obtained core-sheath composite fiber was 3.5% by weight. Table 9 shows the physical properties of the fibers.

The moisture absorption performance and the contact cold feeling are excellent, and even when washed, the moisture absorption performance and the contact cold feeling are maintained, and the dyeing fastness is excellent.

[Example 32]

A polyamide, not including the titanium oxide, the relative viscosity of barium sulfate 1.0% by weight, sulfuric acid 2.60, a terminal amino group amount 5.98 × 10 ^- way except that ⁵ mol / g of nylon 6 chips on a sheath, such as in Example 28 To obtain 56 decitex 24 filament core-sheath conjugated fibers.

The amount of barium sulfate in the obtained core-sheath composite fiber was 0.5% by weight. Table 9 shows the physical properties of the fibers.

The moisture absorption performance and the contact cold feeling are excellent, and even when washed, the moisture absorption performance and the contact cold feeling are maintained, and the dyeing fastness is excellent.

[Example 33]

A polyamide, not including the titanium oxide, 1.0% by weight magnesium oxide, sulfuric acid relative viscosity of 2.60, a terminal amino group amount 5.98 × 10 ^- methods such except that ⁵ mol / g of nylon 6 chips on a sheath as in Example 28 To obtain 56 decitex 24 filament core-sheath conjugated fibers.

The amount of magnesium oxide in the obtained core-sheath composite fiber was 0.5% by weight. Table 9 shows the physical properties of the fibers.

The moisture absorption performance and the contact cold feeling are excellent, and even when washed, the moisture absorption performance and the contact cold feeling are maintained, and the dyeing fastness is excellent.

[Comparative Example 8]

A polyamide, not including the titanium oxide, sulfuric acid relative viscosity of 2.71, terminal amino group amount is 5.95 × 10 ^{- 5} mol / g of using nylon 6 chips, and melted at 260 ℃, and by melt-discharging using the Round Hole spinneret , Nylon 6 fibers of 56 decitex 24 filaments were obtained in the same manner as in Example 28. [ Table 9 shows the physical properties of the fibers. Comparative Example 8 was a general nylon 6 fiber, and therefore, the moisture absorption performance and the contact cold feeling deteriorated.

[Example 34]

As the polyamide, 0.1 wt% of titanium oxide, the relative viscosity sulfate 2.63, terminal amino group amount is 5.10 × 10 ^{- 5} mol / g is used instead of nylon 6 chips on a sheath, except Example 28 text 56 decitex in the same way as the 24-filament Of core-sheath composite fibers. Table 9 shows the physical properties of the fibers.

[Example 35]

A polyamide, 20% by weight of titanium oxide, the relative viscosity sulfate 2.30, the amino terminus amount is 5.21 × 10 ^{- 5} mol / g is used instead of nylon 6 chips on a sheath, except Example 28 text 56 decitex in the same way as the 24-filament Of core-sheath composite fibers.

The yarn breaks frequently during spinning. Table 10 shows the physical properties of the fibers.

The moisture absorption performance and the contact cold feeling are excellent, and even when washed, the moisture absorption performance and the contact cold feeling are maintained, and the dyeing fastness is excellent. However, since the amount of titanium oxide was excessively large, the spinning yarn breakage was frequent and the tensile strength was low at 1.7 cN / dtex, which was not practical because the productivity was low due to insufficient strength,

[Example 36]

The same procedure as in Example 29 was carried out except that the main roll of the first roll was wound at 2381 m / min, the main roll of the second roll at 3571 m / min, and the roll at a winding speed of 3500 m / min. Core-sheath composite fibers were obtained. Table 10 shows the physical properties of the fibers.

By appropriately stretching the polyamide of the beginning portion, the core crystal compound of the present invention was obtained by controlling the? Crystal orientation parameter of the beginning portion so as to keep the hygroscopic property and the contact cold feeling satisfactory even when washed.

[Example 37]

The same procedure as in Example 29 was carried out except that the primary roll of the first roll was wound at 2245 m / min, the primary roll of the second roll at 3367 m / min, and the winding speed of 3300 m / Core-sheath composite fibers were obtained. Table 10 shows the physical properties of the fibers.

By appropriately stretching the polyamide of the beginning portion, the core crystal compound of the present invention was obtained by controlling the? Crystal orientation parameter of the beginning portion to maintain the hygroscopic performance and contact cold feeling even when washed, and having excellent dyeing fastness.

[Example 38]

The same procedure as in Example 29 was carried out except that the primary roll of the first roll was wound at 4474 m / min, the primary roll of the second roll at 4474 m / min, and the winding speed at 4250 m / Core-sheath composite fibers were obtained. Table 10 shows the physical properties of the fibers.

The orientation parameter of the initial portion was controlled by applying suitable stretching to the polyamide at the beginning, so that the core-sheath composite fiber having good moisture absorption performance and contact cold feeling and excellent dyeing fastness even after washing was obtained.

[Example 39]

Core-sheath conjugated fiber of 56 dtex 24 filaments was obtained in the same manner as in Example 29, except that the core-sheath ratio (parts by weight) was 30/70. Table 10 shows the physical properties of the obtained fibers.

By controlling the ratio of the core-to-flower ratio to an appropriate ratio, the core crystal compound having excellent dyeing fastness was obtained by controlling the? -Crystal orientation parameter of the initial portion to maintain moisture absorption performance and contact cold feeling even when washed.

[Example 40]

Core-sheath conjugated fiber of 56 decitex 24 filaments was obtained in the same manner as in Example 29 except that the core-sheath ratio (weight part) was 20/80. Table 10 shows the physical properties of the obtained fibers.

By controlling the ratio of the core-to-flower ratio to an appropriate ratio, the core crystal compound having excellent dyeing fastness was obtained by controlling the? -Crystal orientation parameter of the initial portion to maintain moisture absorption performance and contact cold feeling even when washed.

[Example 41]

Core-sheath conjugated fiber of 56 decitex 24 filaments was obtained in the same manner as in Example 29, except that the core-sheath ratio (weight part) was 70/30. Table 10 shows the physical properties of the obtained fibers.

By controlling the ratio of the core-to-flower ratio to an appropriate ratio, the core crystal compound having excellent dyeing fastness was obtained by controlling the? -Crystal orientation parameter of the initial portion to maintain moisture absorption performance and contact cold feeling even when washed.

[Example 42]

Core sheath conjugated fiber of 56 decitex 24 filaments was obtained in the same manner as in Example 29, except that the core-sheath ratio (weight part) was 80/20.

Table 10 shows the physical properties of the obtained fibers.

By controlling the ratio of the core-to-flower ratio to an appropriate ratio, the core crystal compound having excellent dyeing fastness was obtained by controlling the? -Crystal orientation parameter of the initial portion to maintain moisture absorption performance and contact cold feeling even when washed.

(Industrial availability)

The core-sheath composite yarn of the present invention can provide a core-sheath composite yarn having high hygroscopic performance, superior comfort over natural fibers, and durability and durability of fastness to moisture absorption which can withstand practical use.

Claims (10)

Wherein the initial polymer is polyamide and the core is a thermoplastic polymer and the moisture absorption and desorptivity (DELTA MR) is 5.0% or more, and the DELTA MR retention ratio after 20 times of washing is 90% or more and 100% or less. The method according to claim 1,
Seocho compound yarn with washing fastness not less than grade 3 and not more than grade 5. 3. The method according to claim 1 or 2,
Wherein the? -Crystal orientation parameter of the polymer at the beginning is 1.9 or more and 2.7 or less, and the core thermoplastic polymer is a polyetheresteramide copolymer. 4. The method according to any one of claims 1 to 3,
The amino terminal group amount of core-sheath composite's sheath polymer 3.5 × 10 ^- sa compound ⁵ mol / g or less sheath ^{- 5} mol / g or more 8.0 × 10. 5. The method according to any one of claims 1 to 4,
A core-sheath composite yarn having a flatness of 1.5 to 5.0. The method according to any one of claims 1, 2, and 4,
A core-sheath composite yarn comprising inorganic particles in an amount of 0.1 to 5 wt% in the entire fibers. The method according to claim 6,
A core-sheath composite yarn having an? Crystal orientation parameter of 1.7 or more and 2.6 or less of a polymer of the beginning part. 8. The method according to claim 6 or 7,
A core-sheath composite yarn wherein the shear polymer contains 0.2 to 6 wt% of inorganic particles. 9. The method according to any one of claims 6 to 8,
Wherein the inorganic particles are titanium oxide. A fabric with at least a core-sheath composite yarn according to any one of claims 1 to 9.

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