JPH1112806A - Inner wear with excellent hygroscopicity - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain the subject inner wear excellent in refreshing feeling, hygroscopicity, water-absorbability and dryability, and esp. comfortable and no sticky in feeling of wear by employing a specific high-hygroscopic polyamide fiber. SOLUTION: This inner wear of knitted cloth of polyamide fiber is obtained by using a high-hygroscopic polyamide fiber made of such a polyamide as to contain 3 to 15 wt.% of poly(vinylpyrrolidone) based on the polyamide, wherein the pyrrolidone content in the polyamide is <=0.1% of the poly(vinylpyrrolidone) content and the cross section of the fiber has a deformation degree of >=1.7 and multifoliate pattern having >=3 foils.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to a refreshing feeling, a hygroscopic property,
The present invention relates to an innerwear product excellent in water absorbency and dryness, and particularly excellent in hygroscopicity and comfortable to wear without stickiness.

[0002]

2. Description of the Related Art Polyamide fibers, which are one type of synthetic fibers, are characterized by high strength, abrasion resistance, softness, gloss characteristics, and clearness in dyeing. Therefore, it has been favorably used for clothing products such as legwear such as pantyhose, innerwear, and sportswear. In particular, innerwear is preferred for its suppleness, drapeability, smooth touch on the surface, coolness when worn, and the like of polyamide fibers, and has been widely used as lingerie and foundation for women.

On the other hand, natural fibers typified by cotton and wool are preferred for their texture and comfort, and especially for innerwear and inner garments that come into direct contact with the skin, many cottons have moderate hygroscopicity. Used.

However, cotton innerwear lacks aesthetics such as suppleness, drapability, and glossiness, and also has insufficient smooth touch on the surface and a feeling of coolness when worn. It was not suitable for wear.

[0005] On the other hand, thermoplastic synthetic fibers such as polyamide fibers and polyester fibers have excellent properties such as strength and dyeing fastness, but are inferior in hygroscopicity to natural fibers. Therefore, the water vapor generated in the clothes due to perspiration does not sufficiently absorb the moisture and stays in the clothes. In particular, the sense of humidity at the time of high temperature and high humidity in summer is very unpleasant. Polyamide fibers have a higher equilibrium moisture content (hygroscopicity under standard conditions) than polyester fibers, but are still insufficient from the viewpoint of comfortable feeling when worn.

[0006]

SUMMARY OF THE INVENTION Accordingly, the present inventors
First, in order to improve the hygroscopicity of the polyamide fiber, polyvinylpyrrolidone (hereinafter also referred to as PVP) and polyetheramide (hereinafter also referred to as PEA) and / or polyetheresteramide (hereinafter also referred to as PEEA) are added to the polyamide.
(Japanese Patent Laid-Open No. 7-150414).
No.). However, with this technology, although the target moisture absorption properties can be obtained, the color tone is poor, which is unsatisfactory for garment products that pursue aesthetics. Attempts to manufacture yarns have caused a problem that yarn breakage frequently occurs during yarn production, making stable production difficult.

[0007] Similarly, the present inventors disclosed in Japanese Patent Laid-Open No. 7-15 / 1995.
As described in Japanese Patent No. 0415, a technique has been proposed in which a hygroscopic polyamide fiber having good whiteness can be obtained by kneading a reducing agent together with PVP. According to the technique described therein, although a fiber close to white is obtained in terms of brightness, it is difficult to eliminate the yellowish color tone derived from PVP, and therefore, the yellowness in an undyed state is still unsatisfactory. Was something. In addition, there are many yarn breaks when producing ultrafine yarns or highly deformed yarns, and it has been difficult to sufficiently satisfy productivity.

The inventors of the present invention have continued their studies on solving the above-mentioned drawbacks of the prior art, and as a result, the polyamide filaments to which specific polyvinylpyrrolidone is added have good spinnability and the conventional polyamide When used for an innerwear knitted fabric with the advantages of the filament, it is found that the yellowness and whiteness are good, the washing durability is excellent, the dyeability is good, and the wearing comfort is excellent, The present invention has been accomplished.

That is, the present invention provides a polyamide fiber innerwear having high hygroscopicity and excellent color tone, that is, excellent cooling sensation, hygroscopicity, water absorption, and drying property, and particularly, non-greasy and comfortable wearing feeling. A main object of the present invention is to provide innerwear having excellent hygroscopicity and made of a knitted fabric having the following.

[0010]

In order to achieve this object, the innerware of the present invention mainly has one of the following structures. That is, in the innerwear made of a knitted fabric made of a polyamide fiber, the polyamide fiber is used to make the polyvinylpyrrolidone 3 to 15 with respect to the polyamide.
wt.%, the content of pyrrolidone in the polyamide is 0.1 wt% or less of the polyvinyl pyrrolidone amount, and the fiber cross section is not less than 1.7 and the degree of deformation is not less than 3 leaves. In innerwear having excellent hygroscopicity, characterized by being a leaf-shaped highly hygroscopic polyamide fiber, or innerwear made of a knitted fabric made of polyamide fiber, the polyamide fiber is formed by adding polyvinylpyrrolidone to polyamide by 3%. -15% by weight of a polyamide, wherein the content of pyrrolidone in the polyamide is 0.1% by weight of the amount of polyvinylpyrrolidone.
The innerwear is excellent in hygroscopicity, characterized by the following highly hygroscopic polyamide fibers.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION The polyvinyl pyrrolidone (PVP) -containing polyamide fiber used in the present invention uses a specific PVP different from the conventional one, and has a much lower pyrrolidone content in the polyamide fiber. As a result, while maintaining the advantages of the conventional polyamide fiber, the yellowness is low, the color tone is excellent, the moisture absorption is excellent, the dyeability and the washing durability are good, and the ultrafine yarn and high deformation Yarns can be stably produced.

[0012] The specific PVP is characterized in that the amount of pyrrolidone contained therein is extremely small, not more than 0.1 wt%, and is obtained by a synthesis method using isopropyl alcohol as a solvent during polymerization. be able to.

On the other hand, since conventional PVP is produced using water as a solvent during polymerization, pyrrolidone as a by-product is frequently generated in the polymerization step at the time of production, and as a result, the resulting PVP is obtained. Are pyrrolidone contents as high as about 0.13 to 0.30 wt%. When the pyrrolidone content is high as described above, when it is added to polyamide to form a fiber, the pyrrolidone content in the polyamide fiber naturally increases and the yellowness increases, so the yellowness is reduced to 10 or less. It is difficult. As a result, the conventional PVP-containing fiber has a high yellowness, giving a dull color tone after dyeing, and is unsatisfactory for innerwear applications where aesthetics are pursued.

In the highly hygroscopic polyamide fiber used in the present invention, in order to obtain desired hygroscopic properties, the polyamide fiber is preferably 3 to 3 times.
It is necessary to contain polyvinylpyrrolidone (PVP) in an amount of 15 wt%. Further, as described above, since PVP having an extremely low pyrrolidone content is used, in the highly hygroscopic polyamide fiber of the present invention, the content of pyrrolidone contained in the fiber is as low as 0.1 wt% or less of the PVP content. .

[0015] In order to impart desired high moisture absorption properties to the fiber, PVP needs to be contained in the polyamide in an amount of 3 to 15% by weight, and particularly preferably 4 to 8% by weight. P
If the VP content is too low, less than 3 wt%, sufficient hygroscopicity cannot be obtained. On the other hand, if the content exceeds 15 wt%, stickiness is exhibited and the feel becomes poor, and furthermore, the yarn-making properties become poor and it becomes impossible to carry out stable yarn-making.

It is necessary that the content of pyrrolidone be 0.1 wt% or less of the contained PVP amount, preferably 0.05 wt% or less, more preferably 0.0 wt% or less.
It is 3 wt% or less. When the pyrrolidone content is within the above range, the yellowness in an undyed state can be 10 or less, and a fiber having a good color tone suitable for clothing can be obtained. That is, when the yellowness of the undyed polyamide fiber or its fabric is 10 or less, the color tone after dyeing has no dullness, and a high-quality innerwear product having a good color tone can be obtained.

The pyrrolidone content used in the present invention is 0.1 w
PVP of t% or less can be produced by a method using isopropyl alcohol as a solvent during polymerization.
In that case, it is preferable that a hydrogen peroxide-based catalyst is not included as a polymerization initiator in order to further suppress the generation of pyrrolidone, a by-product that causes yellowness. Other conditions may employ a usual polymerization method.

The K value of the PVP used in the present invention is preferably from 20 to 70, and more preferably from 20 to 60. Even if PVP having a K value that is too low is kneaded into the polyamide, since it is weakly entangled with the polyamide molecular chain described later, most of the PVP is easily eluted by cooling water treatment of the gut after kneading, and therefore, a desired high moisture absorption is obtained. To obtain the properties, a large amount of PVP must be kneaded into the polyamide, which reduces the production efficiency. On the other hand, if the K value is too high, the viscosity increases when kneading the polyamide into the polyamide, which makes it difficult to form chips by melt-discharging, which also lowers the production efficiency.

Further, when the highly hygroscopic polyamide fiber of the present invention is used for innerwear, it is preferable to use a deformed cross-section fiber having a degree of deformation of 1.7 or more, and more preferably 2.4 or more, in order to improve the moisture absorption rate and water absorption. It is preferable for improving the properties. By having a high deformation cross section having a degree of deformation of 1.7 or more, capillaries are formed between the filaments, and the water absorption is further increased by the capillary phenomenon, and the drying becomes faster due to rapid diffusion and divergence. Further, since the fiber surface area is increased due to the high degree of deformation, the moisture absorption rate is further improved.

When the highly moisture-absorbing polyamide fiber of the present invention is used for innerwear, it is preferable to use a fiber having a three- or more-leaf cross section in order to improve the moisture absorption rate and water absorption. By having a multi-leaf cross section of three or more leaves, many capillaries are formed between filaments,
Capillary action results in higher water absorption and faster diffusion and divergence results in faster drying. further,
By having a multi-lobed cross-sectional shape, the contact area when touching the skin is reduced, and a refreshing touch without a sticky feeling is obtained, which is particularly suitable as innerwear in summer.

The degree of deformation of the fiber is determined by calculating the shortest distance and the longest distance of the distance from the center of gravity of the shape to the outer periphery of the cross section in the cross section of the single fiber, and calculating the value of the longest distance / shortest distance. Defined by

The polyamide fibers used in the present invention preferably have a water-soluble component elution rate of 5% or less, more preferably 3% by weight or less. This elution rate is a value of a water-soluble component elution rate obtained from a weight change rate when the polyamide fiber of the present invention is treated in boiling water for 30 minutes.

Since PVP is extremely water-soluble, it has a property that it easily bleeds out to the polymer surface even after being contained in the polymer. Pyrrolidone in PVP is also extremely water-soluble and likewise easily bleeds out to the polymer surface.

Accordingly, in the case of the highly hygroscopic polyamide fiber containing PVP, the elution of PVP and pyrrolidone contained therein is suppressed in order to maintain the hygroscopic property and to maintain the good fiber feeling and feel. preferable. For example, in the case of a polyamide fiber having an elution rate of 5% or less, PVP does not substantially precipitate on the fiber surface when worn after being made into a fiber product, and is extremely favorable in terms of a supple texture and a smooth feel.

In order to set the dissolution rate to a desired low level, PV
It is preferable to take a means for strengthening the entanglement of the molecular chains of P and the polyamide. For example, a method in which PVP is kneaded into a polyamide by an extruder to form a master polymer is preferable because the entanglement between the polyamide molecular chain and the PVP molecular chain can be strengthened.

The kneading is preferably carried out by a kneading method under a condition of a low oxygen concentration in order to reduce yarn breakage during spinning. In contrast, the oxygen concentration in the atmosphere (about 2
In the case of using a master polymer kneaded in an environment having a high oxygen concentration equal to or higher than 0%), thread breakage occurs frequently during yarn production, and stable production becomes difficult. The low oxygen concentration level is, for example, 15% or less, preferably 1% or less.
The concentration may be 0% or less, and a method of flowing an inert gas such as nitrogen through a hopper or a cylinder to reduce the oxygen concentration may be employed.

The kneading concentration of PVP in the master polymer is 10 to 50 wt%. If the content is less than 10 wt%, the original effect of the master polymer is hardly achieved, and the productivity is poor. 50wt%
If it exceeds 300, it is difficult to knead it in stably.

The PVP-containing polyamide master polymer chip thus obtained is then subjected to a concentration adjustment by a chip blending method with a substantially non-added polyamide chip (chip blending method), and then the concentration is adjusted. , Supplied to the melt spinning.

When polyetheramide (PEA) or polyetheresteramide (PEEA) is used in combination as described in JP-A-7-150414, PVP and PEA and aqueous solution of caprolactam before the polymerization of polyamide are added. And / or a method of adding PEEA. However, in order to suppress the elution rate to 5 wt% or less without using PEA or PEEA, it is effective to use the above-mentioned master polymer method.

The polyamide containing a predetermined concentration of PVP is produced by spinning by a usual method by melt spinning. The spinning method may be a direct spinning drawing method in which after spinning, cooling and refueling, the spinning is performed at a spinning speed of 1000 m / min or more, and the film is stretched and wound without winding once, or 3,000 m / min or more. Spinning at high speed,
A high-speed spinning method of winding without substantially stretching may be used.

On the other hand, in the two-stage yarn forming method in which the yarn is once wound and then drawn, the winding form of the undrawn yarn winding package is easily broken due to its high moisture absorption speed.
It is not preferable because stable yarn production becomes difficult.

The fineness of the highly moisture-absorbing polyamide fiber obtained by spinning is not particularly limited, but a multifilament yarn having a single fiber fineness of about 0.5 to 8.0 denier is preferred.

The obtained highly hygroscopic multifilament yarn is knitted by a usual method without taking special conditions, and is formed into a warp knitted fabric or a circular knitted fabric such as a half tricot, a two-way tricot, or Russell, Post-processing and sewing are performed as necessary to produce innerwear products represented by lingerie, foundations, and the like.

From the viewpoint of sufficiently satisfying the desired moisture absorption level in the innerwear product, the maximum moisture absorption of the highly moisture-absorbing polyamide fiber is 8% or more, and the maximum moisture absorption and the standard moisture absorption after moisture release. Is preferably 4% or more. If the maximum moisture absorption rate is less than 8%, sweat due to insensitive transpiration (that is, sweat is constantly evacuated from the skin without feeling sweating) cannot be sufficiently absorbed, and excellent wear is achieved. Sometimes it is difficult to get a feeling of comfort. If the difference between the maximum moisture absorption rate and the standard moisture absorption rate after moisture release is less than 4%, the sweat once absorbed by the knitted fabric is unlikely to evaporate, so that a feeling of stuffiness is felt and a comfortable feeling is hardly obtained.

It is preferable that the drying rate of the highly hygroscopic polyamide fiber is 0.014 cc / min or more in order to avoid a sticky feeling when sweating. It may be adjusted to an appropriate level that is not too large.

Further, the knitted fabric for an innerwear product preferably has a water absorption height of 70 mm or more in order to improve the stickiness when sweating in a large amount.

In order to exhibit desirable moisture-absorbing properties in these innerwear products, the above-mentioned highly moisture-absorbing polyamide fibers may be used in 30% by weight or more of the fiber material, and the higher the ratio, the higher the wearing comfort.

[0038]

EXAMPLES The methods for measuring various physical properties in the present invention are as follows.

<Pyrrolidone content (based on PVP)> Hexafluoroisopropanol 3 m was added to 100 mg of a fiber sample.
and 1 ml of chloroform were added to dissolve the fibers. Ethanol was added to the resulting solution to reprecipitate the polymer component and the solution was dissolved in 20 ml. The solution components are analyzed by gas chromatography according to a standard method. The apparatus uses GC14A (manufactured by Shimadzu Corporation) and the column uses NB-1 (15 m). For the determination of pyrrolidone, a calibration curve of valerolactam is prepared and used in advance. The pyrrolidone content of the fiber is determined by the following equation.

Pyrrolidone content (vs. fiber) (wt%) =
[(GC peak area / calibration curve coefficient) (mg / ml) x solution volume (m
l) / sample amount (mg)] × 100 and [pyrrolidone content (vs. fiber) (wt%) / PVP content in fiber (wt%)] × 100 (wt%)
The pyrrolidone content (vs. PVP) is determined.

<K value of PVP> PVP is used as an aqueous solution having a concentration of 1%, and its relative viscosity is measured and determined by the Fikentscher equation.

LogZ = C [75 k ² /(1+1.5 kC) + k] where Z: relative viscosity of the aqueous solution having a concentration C, k: K value × 10
^-3 , C: concentration of aqueous solution (W / V%).

<Elution rate of water-soluble component> After drying the polyamide fiber at 110 ° C for 8 hours, the fiber weight (W1) is measured. Then, after treating in boiling water for 30 minutes, it is dried again at 110 ° C. for 8 hours, and its fiber weight (W2) is measured. Weight loss rate before and after that = (W1−W2) / W1
Is the elution rate of the water-soluble component.

<Yellowness of fiber or knitted fabric>
A knitted knitted fabric having a knitting density of 45 yarns / inch by a 27 gauge knitting machine is used as a sample. The knitted fabric sample is folded in half, and the tristimulus values X, Y, and Z are measured by a color meter # 80 manufactured by Nippon Denshoku Industries Co., Ltd. according to a predetermined method of the measuring device, and the yellowness is determined by the following equation.

YI (yellowness) = 100 × [1.28X−
1.06Z] / Y <Maximum moisture absorption rate of fiber or knitted fabric, standard moisture absorption rate after moisture release> Fiber of sample (sample knitted in the same manner as above may be used)
Alternatively, the knitted fabric is scoured to remove the oil agent. About 1 g thereof was put into a glass weighing bottle (tare weight F), and dried at 110 ° C. in a dryer.
Dry for 2 hours. The weighing bottle was sealed, and allowed to cool in a desiccator for 30 minutes.
The total weight (K) of the weighing bottle containing is measured. Next, 20
It is put in a thermo-hygrostat set at 65 ° C. and 65% RH (a thermo-hygrostat “Rainbow” manufactured by Tabai Seisakusho Co., Ltd.) in an open state and left for 24 hours. Thereafter, the sample is left in the desiccator for 30 minutes in a sealed state again, and then the weight (H) of the weighing bottle containing the sample is measured. Subsequently, the opened weighing bottle was placed in a constant temperature / humidity chamber set at 30 ° C. and 90% RH.
The total weight (S) after 4 hours is measured in the same manner. It is calculated from the above values by the following formula.

Maximum moisture absorption = [(S−K) / (K−F)]
× 100 (%) Standard moisture absorption after moisture release = [(HK) / (KF)] × 1
00 (%) <Drying rate of fiber or knitted fabric> After drying / cooling / weighing the fiber of the sample (the sample may be a tubular knitted fabric as described above) or the knitted fabric as above, 1 cc Of distilled water is dropped on the sample, and the total weight (W0) of the weighing bottle containing the sample is measured. Next, the weight of the weighing bottle containing the sample (WT: T is time (WT: T) is set at intervals of 10 minutes from the time when the sample is put in a thermo-hygrostat set at 20 ° C. and 65% RH in an open state in the same manner as described above. Minutes)) for 90 minutes. The moisture content corresponding to each drying time T is obtained by the following equation, where K is the same as the value of K at the time of measuring the moisture absorption rate.

Moisture percentage at time T = [(WT-K) /
(W0−K)] × 100 (%) Next, WT is plotted against time T to draw a drying curve. The drying speed (cc / min) is determined from the slope of the tangent at T = 0 of the obtained drying curve. Here, the amount of water (cc) at a water content of 100% is equal to the amount of distilled water dropped.

<Water Absorption Height of Knitted Fabric> Five knitted fabric test specimens having a width of 1 cm and a length of 20 cm are sampled in each of the longitudinal direction and the weft direction. One end of the test piece is fixed with a gripper, and about 2 cm of the other end is immersed in distilled water at 20 ± 2 ° C. The distance (mm) at which water rises by capillary action up to 10 minutes after the start of immersion is read out to 1/2 mm, and it is measured five times for each of the test pieces in the meridional direction and the weft direction, and expressed as an average value.

<Moist feeling and stickiness of innerwear product> Five subjects sewn the samples sewn in each form in a room conditioned at 20 ° C and 65% RH.
Each of the evaluations was given on a four-point scale (x, x, y, x, x, x, x, x, x, x, x). The clothing condition and the measurement conditions were as follows for the slip sample. Wearing condition; Shorts + Bra + Sample slip + Skirt (cotton) + Long sleeve blouse (Polyester) Wearer's time schedule; 20 minutes: Resting state →
10 minutes: walking (using a running machine, 80m / min) →
5 minutes: Evaluation at rest

[Example 1] As PVP, PVP having a K value of 30 ("Rubiscol" K30 special grade manufactured by BASF; hereinafter abbreviated as K30SP) synthesized by a usual method using isopropyl alcohol as a solvent was used. . The pyrrolidone content in this PVP (K30SP) was 0.02 wt%. This PVP was kneaded and mixed with nylon 6 having 98% sulfuric acid relative viscosity ηr of 2.72 using an extruder (φ40 mm, double-row, biaxial), extruded in a gut shape, cooled, and pelletized to give a PVP concentration of 30 wt. % Master polymer chip. At this time, the oxygen concentration was adjusted to 8 by flowing nitrogen through the hopper and cylinder.
% Or less.

In a rotary vacuum dryer, nylon 6 chips and the above-mentioned master polymer chips were dried in a usual manner while blending them at a predetermined ratio. The content of PVP with respect to nylon 6 in the blend chip obtained by drying was 3, 7, and 15 wt%.

Each of the blended chips was melted at 270 ° C., discharged from a 13-hole Y-type die, fed at a spinning speed of 1300 m / min, a draw ratio of 2.3 and a winding speed of 30.
The PVP-containing polyamide multifilament having 30 denier and 13 filaments in a trilobal section having a degree of deformation of 2.6 was obtained by direct spinning and drawing at 00 m / min (level).
No. 3, 4, 5).

The obtained filaments have a sufficiently low yellowness and water-soluble component dissolution rate, a high maximum moisture absorption rate, a large difference between the maximum moisture absorption rate and the standard moisture absorption, and a color tone and texture. Both the feel and the moisture absorption properties were excellent. The drying speed was also high. When the obtained fiber was dyed in turquoise blue by a usual dyeing method, the lightness was 3
5. Good color developability of chroma 40 was obtained.

Further, using the obtained PVP-containing polyamide multifilament, a 32-gauge half tricot is knitted by an ordinary method, and then a slip is sewn from the knitted fabric by an ordinary method, and a wearing test is performed. did. As shown in Table 1, the obtained knitted fabrics and slips were excellent in color tone and water absorbency at all levels, and were comfortable to wear without stickiness or stuffiness when worn. Comparative Example 1 A PVP-containing polyamide blend chip was obtained in the same manner as in Example 1 except that the polymer blend ratio in the rotary vacuum dryer was changed and the PVP content was changed to 0.5, 2, and 18 wt%. Similarly, multifilaments were produced (levels Nos. 1, 2, and 6), and the same measurement as in Example 1 was performed as a tubular knitted fabric.

As shown in Table 1, the PVP content was 0.5,
At the level of 2 wt% (No. 1 and 2), the maximum moisture absorption is too low,
Also, the difference between the maximum moisture absorption and the standard moisture absorption was too low, and the moisture absorption properties were poor. Also, when the PVP content was at a level of 18 wt% (No. 6), the drying speed was low, there was a sticky feeling, and the feel and feeling were poor.

Further, using the obtained PVP-containing polyamide multifilament, a half tricot was knitted in the same manner as in Example 1, and a slip was produced. As a result, as shown in Table 1, when fibers having too low a PVP content were used (levels 1 and 2), the difference in moisture absorption rate was small, and a sense of stuffiness was felt. On the other hand, when the fiber having too much PVP content was used (level 6), there was a sticky feeling and the feeling of comfort was poor.

[Comparative Example 2] The variety of PVP was changed and synthesized using water as a solvent, and the pyrrolidone content was 0.15 wt%.
%, A K value of 30 ("Rubiscol" K30 normal grade manufactured by BASF; hereinafter abbreviated as K30), and the same procedure was carried out as in Nos. 3 and 4 of Example 1 to add PVP. Polyamide multifilament yarns having a ratio of 3 wt% and 7 wt% were produced (levels Nos. 7 and 8).

When the yellowness (YI) of the obtained filament yarn was measured in an undyed state, as shown in Table 1, the yellowness was extremely high at 15.0 and 21.2. When the filament yarn of level No. 7 was dyed in the same manner as in Example 1, a lightness of 32 and a saturation of 28 resulted in a dull color tone.

Using the obtained PVP-containing polyamide multifilament, a half tricot was knitted in the same manner as in Example 1, and a slip was produced. As a result, as shown in Table 1, since the fiber containing too much pyrrolidone was used and the yellowness (YI) was high, the obtained slip had a strong white dullness and was inferior as a commercial product. .

[0060]

[Table 1]

Example 2 By changing the shape of the die hole, a multifilament having a fiber cross-sectional shape of a circle, Y-type, pentagon, or octagon and a degree of deformation shown in Table 2 was obtained. Except that the PVP content was changed to 5% by weight, the yarn was produced in the same manner as in Level No. 4 of Example 1 to obtain 30 denier 13
Nylon 6 filament yarn of filament was obtained (Level No.
11-18).

Using the obtained nylon 6 long fiber yarn, a half tricot was knitted in the same manner as in Example 1 to produce a slip, and the yellowness, the water absorption height and the feeling of stickiness were evaluated.
As shown in Table 2, when the degree of deformation of the fiber cross section was as high as 1.7 or more (levels 13 to 18), the water absorption height was high and the stickiness was even better.

[0063]

[Table 2]

[0064]

According to the present invention, an innerwear product excellent in both wearing comfort and aesthetics can be obtained by using a highly hygroscopic polyamide fiber excellent in both hygroscopicity and color tone. In other words, the wearing comfort such as stuffiness and stickiness can be significantly improved without impairing the aesthetics and functionality possessed by the innerwear product, so that the tactile sensation and comfort when worn even in summer and during exercise can be improved. In both cases, excellent innerwear products can be put to practical use.

Claims (6)

[Claims] 1. An innerwear made of a knitted fabric made of polyamide fiber, wherein the polyamide fiber is made of polyamide containing polyvinylpyrrolidone in an amount of 3 to 15% by weight based on polyamide, and the content of pyrrolidone in the polyamide is reduced. 0.1 wt% of polyvinylpyrrolidone
And the fiber cross-section is 3 or more with a degree of deformation of 1.7 or more.
An innerwear having excellent hygroscopicity, characterized by being a highly hygroscopic polyamide fiber having a multi-leafed shape. 2. The cross section of the polyamide fiber has a degree of deformation of 2.
The innerwear having excellent hygroscopicity according to claim 1, wherein the innerwear has a multi-leaf shape of four or more and three or more leaves. 3. An innerwear made of a knitted fabric made of polyamide fiber, wherein the polyamide fiber is made of polyamide containing polyvinylpyrrolidone in an amount of 3 to 15% by weight based on polyamide, and the content of pyrrolidone in the polyamide is reduced. 0.1 wt% of polyvinylpyrrolidone
Innerwear having excellent hygroscopicity, characterized by the following highly hygroscopic polyamide fibers. 4. The innerwear excellent in hygroscopicity according to any one of claims 1 to 3, wherein the knitted fabric has an undyed yellowness of 10 or less. 5. The polyamide fiber has a water-soluble component elution rate of 5% or less, a maximum moisture absorption rate of 8% or more, a difference between the maximum moisture absorption rate and a standard moisture absorption rate after moisture release is 4% or more, and The innerwear having excellent hygroscopicity according to any one of claims 1 to 4, wherein a drying rate is 0.014 cc / min or more. 6. The innerwear excellent in hygroscopicity according to claim 1, wherein the knitted fabric has a water absorption height of 70 mm or more.