JPH10266029A - Combined yarn of polyester filaments with different shrinkage - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain the subject combined yarn of polyester filaments with different shrinkages having soft feeling, swelling feeling, body, stiffness and resilience, and further good in dry feeling and excellent in fibrillation resistance by constituting the combined yarn out of plural fiber groups having different shrinkages and dissolving rates into a hot alkaline solution. SOLUTION: This combined yarn comprises two kinds of fiber groups A and B having different shrinkages and dissolving rates in a hot alkaline solution. The ratio of dissolving rates of the polyester forming the fiber group A to the polyester forming the fiber group B is regulated so as to be >=5, and the fiber groups A and B satisfy the formula 10<=SA-SB<=30 [SA is a shrinkage factor (%) in boiling water of the fiber group A; SB is a shrinkage factor (%) in the boiling water of the fiber group B]. Further, the shrinkage factor SB(%) in the boiling water of the fiber group B preferably satisfies the formula -5<=SB<=5.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a polyester fiber having a difference in polyester shrinkage. This is a delicate polyester shrinkage differential mixed yarn, which is made into a woven or knitted fabric and then easily dissolved, and the polyester fiber group is dissolved and removed to give a soft, swelling, tight, and rebound feeling. Regarding yarn. More specifically, the low-shrinkage or heat-extensible polyester fiber group is a fiber having a fiber surface layer in which at least two or more types of polyesters are mixed in a sea-island shape, and a streaky groove is formed on the fiber surface by performing weight reduction processing. It has excellent fibril resistance due to streak grooves on the fiber surface, has dry feeling, squeaky feeling,
Furthermore, the polyester shrinkage-differentiated yarn is required to obtain a woven and knitted fabric that has a calm gloss and water absorption.

[0002]

2. Description of the Related Art Polyester fibers are widely used for clothing because of their excellent functionality. Particularly in the field of women's clothing, there is a strong demand for further improvement in texture with the recent trend toward luxury goods. For this reason, conventionally, by blending polyester fibers having different shrinkage ratios, tension and swelling, or imparting a texture such as swelling, or imparting a dry touch texture by forming fine surface irregularities on the polyester fibers, or A number of techniques for improving color development have been proposed.

As a method for imparting tension and swelling, for example, Japanese Unexamined Patent Publication No. Hei 2-216215 discloses a method for producing an alkali-eluting polyester fiber having a boiling water shrinkage of 50% or more. However, the woven fabric obtained according to this publication has a problem that it is difficult to obtain a shrinkable yarn having a stable shrinkage rate, so that the variance is large and the product quality is not stable.

In Japanese Patent Application Laid-Open No. H8-60468,
A polyester entangled composite yarn including multifilaments having different shrinkage rates and easily dissolving filaments whose alkali dissolution rate is 5 times or more as compared with them is disclosed. However, since the multifilament having the highest shrinkage ratio remains even after the reduction in alkali content, the entangled composite yarn disclosed in the publication has a cored hard texture when it is made into a fabric, and only a soft texture is obtained.

Further, JP-A-54-151643 and JP-A-2-191834 disclose entangled composite yarns of a group of high shrinkage fibers and a group of low shrinkage or spontaneously stretched fibers. However, although the fabric obtained according to the publication has a feeling of tension and waist, the high-shrinkage fiber group remains even in the final stage, so that the fabric has a cored and hard texture, and a sufficient soft feeling cannot be obtained.

On the other hand, as a method of giving a dry touch texture, for example, Japanese Patent Application Laid-Open No. 54-120728,
JP-A-55-107512, JP-A-55-518
No. 19, JP-A-3-124852 and the like disclose methods of blending various particles to form fine irregularities on the fiber surface, all of which have a luxurious dry touch texture and silk. Was not able to be imparted.

[0007] Other methods of imparting dryness are described in, for example, JP-A-58-98474 and JP-A-6-98474.
In JP-A-41836 and the like, a method in which an additive incompatible with polyester is blended, and in JP-A-63-6160 and JP-A-7-189027, a modified polyester and an unmodified polyester are mixed and spun. A method by performing weight reduction processing has been proposed. However, none of the polyesters proposed in the publication have sufficient fibril resistance and a high-grade dry touch texture.
A silky squeaky feeling could not be imparted.

Further, Japanese Patent Application Laid-Open No. Sho 60-71725 proposes a method for producing a fiber in which two kinds of polymers having different dyeing properties are laminated in a layered manner. However, streaks and irregularities cannot be formed on the fiber surface, and therefore, even in the case of a woven fabric, a luxurious dry touch texture and silky squeaky feeling cannot be imparted. In addition, it was found that the fibers were fibrillated depending on the weight-reduction processing conditions, and the coloring properties were significantly reduced.

Further, Japanese Patent Application Laid-Open No. 49-109662 proposes a sea-island type fiber which can be made ultrafine to 0.0001d to 0.8d and has streaky irregularities. It was not possible to impart a luxurious dry touch texture and silky squeaky feeling.

[0010] Therefore, the prior art was not excellent in softness, swelling, tightness and stiffness, resilience, further excellent fibril resistance, and could not impart dryness and squeaky feeling.

[0011]

SUMMARY OF THE INVENTION The object of the present invention, which could not be attained by the above-mentioned prior art, is that when it is made into a woven or knitted fabric, it has both a soft feeling, a swelling feeling, a tight feeling, and a resilience feeling, and in addition, has an excellent resistance to resistance. An object of the present invention is to provide a polyester fiber having a different shrinkage due to polyester shrinkage, which has a fibril property and a good dry feeling and squeaky feeling.

[0012]

SUMMARY OF THE INVENTION An object of the present invention is to provide a polyester mixed-shrink yarn comprising two types of fiber groups A and B having different shrinkage rates and different dissolution rates in a hot alkaline aqueous solution. The ratio of the dissolution rate of the polyester forming the fiber group A to the polyester forming the B is 5 or more, which satisfies the following (1). (1) 10 ≦ SA−SB ≦ 30, where SA: boiling water shrinkage rate (%) of fiber group A, SB: boiling water shrinkage rate (%) of fiber group B.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail.
The woven or knitted fabric comprising the polyester shrinkage difference blended yarn of the present invention (hereinafter simply referred to as blended yarn) has a difference in yarn length due to a difference in shrinkage ratio between the fiber groups A and B constituting the blended yarn. After the expression, the fiber group A is dissolved and removed with a hot alkaline aqueous solution, thereby simultaneously exhibiting a soft feeling, swelling, tightness, waist, and resilience.

The difference in shrinkage ratio of the mixed fiber of the present invention is as follows: (fiber group A
-The difference in boiling water shrinkage of the fiber group B) needs to be 10 to 30%. If the difference in shrinkage is less than 10%, a difference in yarn length is unlikely to occur, a large woven crimp cannot be formed in the fiber group B, and good swelling and resilience cannot be obtained. Conversely, if the difference in shrinkage exceeds 30%, the fiber group B forms a large crimp, causing problems such as fluttering and misregistration, resulting in a significant decrease in the quality of the fabric.

The difference in the boiling water shrinkage is measured by the following method. After dividing the mixed fiber into fiber group A and fiber group B, the sample length (LA0, LB0) was applied to each under a load of 0.1 g / d.
Is measured, and then subjected to a boiling water treatment for 20 minutes under no load. After the treatment, the sample length (LA1, L
Measure B1). ＷBWSA = [(LA0−LA1) / LA0] × 100
(%) BWSB = [(LB0−LB1) / LB0] × 100
(%) Difference in boiling water shrinkage (△ BWS) = BWSA-BWSB

The fiber groups A and B constituting the mixed fiber of the present invention need to have different dissolution rates in a hot alkaline aqueous solution, and the polyester forming the fiber group A is different from the polyester forming the fiber group B. On the other hand, the ratio of the dissolution rate to the hot alkaline aqueous solution needs to be 5 or more. If the dissolution rate ratio is less than 5, when the fiber group A is dissolved and removed with a hot alkali aqueous solution, the fiber group B also dissolves, so that a good resilience, tightness and stiffness cannot be obtained.

The dissolution rate in a hot alkaline aqueous solution is measured by the following method. Each of the fiber groups A and B is a circular cross-section fiber having the same denier, and each fiber group is immersed in a 3% aqueous sodium hydroxide solution at a bath ratio of 1: 125 at a temperature of 98 to 100 ° C.
For 30 minutes, the respective weight loss rates are determined by the following formula, and the ratio of the weight loss rates is determined as the ratio of the dissolution rate to the hot alkaline aqueous solution. Weight loss rate (%) = [(W0−W1) / W0] × 100 where W0: weight before alkali treatment, W1: weight after alkali treatment.

The boiling water shrinkage of the fiber group B constituting the mixed fiber of the present invention is preferably -5% to 5%. By reducing the boiling water shrinkage of the fiber group B to -5% to 5%, an optimal woven crimp is formed to obtain an excellent rebound and swelling feeling, and at the same time, a soft texture can be imparted. .

In order to increase the weave crimp, it is preferable to make the fiber group A high in shrinkage. However, if the fiber group A is made to have a high shrinkage exceeding 35%, the difference in shrinkage becomes large. However, it is not preferable because stability of product quality is lacking. .

After knitting and weaving the mixed fiber of the present invention, the fiber group A is completely removed by alkali dissolution treatment, and the fiber group B
When a woven or knitted fabric consisting only of fibers is used, the fiber group B preferably has a breaking strength of 2.2 g / d or more in order to maintain the physical properties of the fabric. In order to sufficiently maintain practical characteristics, the breaking strength of the fiber group B is more preferably 2.5 g / d or more.

In the mixed fiber of the present invention, the weight ratio of the fiber group A is preferably 10% to 30%. 10%
By setting the content to 30%, a difference in yarn length between the fiber group A and the fiber group B is sufficiently exhibited, and an excellent resilience, a swelling without swelling, and a good appearance and quality of the fabric can be obtained.

Further, a fiber group B constituting the mixed fiber of the present invention
Is a polyester fiber having a fiber surface layer portion in which at least two or more types of polyesters are mixed, and the mixed portion preferably forms a sea-island shape. In the present invention, the fiber surface layer portion is a portion having a depth from the fiber surface up to 1 μm, and the depth of the composite portion from the fiber surface is 1 μm.
If it is not less than m, the effect of the present invention will not be impaired even if the center of the fiber is formed in the mixed portion.

In the present invention, by forming the fiber surface layer portion of the fiber group B as a polymer layer mixed in a sea-island shape, it is possible to form a streak-like groove extending in the fiber axis direction on the fiber surface during weight reduction processing. . As a result, it is possible to impart a luxurious dry touch texture and a silky squeaky feeling, and it is possible to form fine streaks by extending streaks extending in the fiber axis direction, or by adding particles. In the method of forming the irregularities, it is difficult to impart the high-grade dry touch texture and silky squeaky feeling that are the objects of the present invention.

The fiber group B constituting the mixed fiber of the present invention must have at least a sea-island-shaped mixed portion in order to form a streak-like groove extending in the fiber axis direction on the fiber surface when the fiber is weight-reduced. It is preferable that two or more polyesters have a dissolution rate difference with respect to a hot alkaline aqueous solution, and it is preferable that the ratio of the dissolution rate of the polyester forming the island portion to the polyester forming the sea portion is 5 or more. In order to form the streak grooves efficiently, the ratio of the dissolution rates is more preferably 8 or more, and still more preferably 15 or more.

The dissolution rate of the sea component and the island component forming the sea-island mixture portion of the fiber group B in the aqueous alkali solution is determined in the same manner as the method for measuring the alkali dissolution rate ratio of the fiber groups A and B described above. That is, two or more types of polyesters used for the sea-island mixture portion of the fiber group B are each made into a fiber having the same denier and a circular cross section, and the ratio of the dissolution rate of each fiber to the aqueous alkali solution is determined.

In addition, a luxurious dry touch texture,
In order to impart a silky squeaky feeling, the circumscribed circle diameter D of the island portion is 0.01 μm or more and 1.0 μm or less in the fiber cross section of the mixed portion mixed in a sea-island shape on the fiber surface layer portion of the fiber group B.
The following is preferred.

The polyester fiber group B constituting the mixed fiber of the present invention preferably forms a streak-like groove extending in the fiber axis direction on the fiber surface upon weight reduction processing, and the streak-like groove forms a sea-island shape. The polyester is formed by dissolving and removing the polyester in the island portion of the mixed portion. In other words, the size of the island has a correlation with the streaky irregularities formed by the weight reduction processing, and imparts a high-quality dry touch texture, a silky squeaky feeling, and simultaneously satisfies the fibril resistance. In order to achieve this, the circumscribed circle diameter D of the island portion is preferably 0.01 μm or more and 1.0 μm or less, more preferably 0.01 μm or more and 0.1 μm or less.

More preferably, in the mixed portion where two or more kinds of polyesters are mixed in a sea-island shape, the island portion extends in the fiber axis direction, and the length L is 2 μm or more and 20 μm or less.

That is, the fiber group B is capable of imparting a luxurious dry touch texture and silky squeaky feeling by forming streaky grooves formed when the weight is reduced. Similarly to the size of the above-mentioned island portion, the length of the island portion is greatly correlated with the formation of the streak-like groove. Therefore, the island part extends in the fiber axis direction, and the length L is 2 μm.
It is preferably from m to 20 μm, more preferably from 4 μm to 15 μm.

The term "the island portion extends in the fiber axis direction" as used in the present invention means that the island portion is oriented at an angle of 30 degrees or less with respect to the fiber axis direction. Part 7
It is sufficient that 0% or more extends in the fiber axis direction.

The circumscribed circle diameter D of the island is measured by the following method. 3% on section of fiber cut to 5μm thickness
An aqueous solution of caustic soda was added dropwise, and a dry heat treatment was performed at 98 ° C. for 15 minutes.
00), and the circumscribed circle diameter of the concave portion is measured at 10 or more locations from the photograph, and the average value is calculated as the circumscribed circle diameter D of the island portion.

The length L of the island is measured by the following method. The fibers are bathed in a 3% aqueous solution of caustic soda in a bath 1: 125,
After performing weight loss processing at a temperature of 98 to 100 ° C. so that the weight loss rate becomes 5% ± 2%, a fiber surface photograph (3000 times) is taken with a scanning electron microscope, and formed on the fiber surface from the photograph. The length of the striped groove is measured at ten or more locations, and the average value is calculated as the length L of the island portion.

The cross-sectional shape of the mixed fiber of the present invention may be circular, irregular, or hollow.
Is preferably a multi-leaf cross-section polyester fiber having 3 to 8 leaves. This is because a multi-leaf cross-sectional shape of 3 leaves or more and 8 leaves or less can express silky touch or dry touch, and can increase a sense of quality.

In the fiber group B of the present invention, it is preferable to mix two or more polymers having different solubilities in a solvent, and to dispose the mixed polymer at least on the fiber surface layer. However, in the case of a combination of polymers having almost no compatibility with each other, it may be difficult to carry out stable yarn production, and if a special solvent is used in forming the streak-like grooves, there is a problem of environmental pollution. Therefore, a combination of polymers capable of forming a difference in shrinkage and forming streaky grooves using a hot alkali aqueous solution generally used in weight reduction processing of polyester fibers is more preferable.

In addition, when weight loss processing is performed, swelling, tension,
In addition to the waist and resilience, in order to form a streaky groove extending in the fiber axis direction and provide a luxurious dry touch texture and a silky squeaky feeling, at least the fiber group B It is more preferable that the mixing ratio of the sea portion and the island portion of the sea-island mixture portion constituting the fiber surface layer portion is 90/10 to 50/50.

As a method of mixing two or more kinds of polyesters, a method of separately melting two or more kinds of polymers and kneading them with a mixer, a method of mixing and melting two or more kinds of polymers in a state of chips, and the like. No. However, in a method in which two or more kinds of polymers are separately melted, kneaded with a mixer, and once made into a master chip, and then spun, the effect of mixing two or more kinds of polyesters is lost, that is, the fibers are elongated in the fiber axis direction. Streaks cannot be formed.

The polyester used in the fiber groups A and B constituting the mixed fiber of the present invention is terephthalic acid as a main acid component, ethylene glycol, tetramethylene glycol, cyclohexane-1,4-dimethanol, pentamethylene glycol. And a polyester having at least one selected from hexamethylene glycol as a main glycol component, and may be copolymerized with 40 mol% or less of a third component. Preferred copolymerization components include dibasic acids such as adipic acid, sebacic acid, isophthalic acid, diphenyldicarboxylic acid, and naphthalene dicarboxylic acid, oxyacids such as oxybenzoic acid, and glycols such as diethylene glycol, propylene glycol, and polyethylene glycol. Examples thereof include polyesters obtained by copolymerizing one or more of 5-sodium sulfoisophthalic acid and 2,2bis {4- (2-hydroxyethoxy) phenyl} propane. However, in the case of polyethylene glycol, the number average molecular weight is 10,000
If it exceeds, the reactivity in the polymer synthesis decreases significantly,
Since the unreacted material becomes incompatible with the polyester and may significantly impair the spinnability, it is preferable to use one having a number average molecular weight of 10,000 or less.

As a method for producing the polyester shrinkage difference mixed fiber yarn of the present invention, a post-mixing method known in the art,
It may be manufactured by any of the spinning fiber mixing methods.

The polyester shrinkage difference mixed yarn of the present invention includes:
In order to improve the processability in knitting and weaving, it is preferable to apply a fluid entanglement treatment. Further, if necessary, yarn processing such as false twisting may be performed.

A woven or knitted fabric is produced using at least a part of the polyester shrinkage-differentiated yarn of the present invention, and then subjected to weight reduction processing to obtain a soft feeling, a swelling feeling, a tight feeling and a repulsive feeling which are the objects of the present invention. In addition, it is possible to produce a woven or knitted fabric having a high-class dry touch texture and a silky squeaky feeling.

[0041]

The present invention will be described in more detail with reference to the following examples. Each characteristic value in the examples was obtained by the following method. A. Hand feeling (softness, swelling, tightness, resilience, dryness, squeaky feeling) For each item, a sensory test was performed on the sample in a pairwise comparison with a reference sample, and evaluated on a 4-point scale. And when they are comprehensively evaluated, "very good" is ◎, "good" is ○, "normal" is △,
“Inferior” is indicated by a cross. As the reference sample, a polyester filament yarn with the same fineness and the same number of filaments as that of the sample raw yarn that is usually used as a standard product was woven and processed in the same manner as the sample, and this was referred to as `` inferior. '' Yes. "

B. Fibril resistance Using a Gakushin type flat abrasion machine for friction fastness test, using a georgette made of 100% polyethylene terephthalate as a friction cloth, the test cloth was subjected to 50 g under a load of 500 g.
The state of occurrence of fibrillation was evaluated on a three-point scale by flat wear 0 times. “Excellent” is indicated by “、”, “normal” is indicated by “△”, and “inferior” is indicated by “×”.

C. Intrinsic viscosity 0.1g sample per 10ml orthochlorophenol
Was dissolved and measured at 25 ° C. using an Ostwald viscometer.

Examples 1-4 After a modified polyester having an intrinsic viscosity [η] of 0.62 and copolymerized with 5.0 mol% of 5-sodium sulfoisophthalic acid was melted, the mixture was spun at a spinning temperature of 293 ° C. using a conventional spinning machine. The undrawn yarn was discharged and wound at a speed of 2500 m / min. Subsequently, the undrawn yarn was drawn 2.0 times with a normal hot roll drawing machine, and the boiling water shrinkage rate was 16.1%.
A fiber group A having a round cross section of 4 denier 12 filaments was obtained.

A polyethylene terephthalate having an intrinsic viscosity [η] of 0.65 and a polyethylene terephthalate having an intrinsic viscosity [η] of 0.70
After melting each modified polyester obtained by copolymerizing 2.6% by mole of 5-sodium sulfoisophthalic acid and 1.0% by weight of polyethylene glycol having a number average molecular weight of 1,000, the weight ratio was 75/25 and the ratio was 75/25. Mixer 5
The mixture is melt-mixed by a mixing device having a step, and the spinning temperature is 293.
C., and the undrawn yarn was wound at a speed of 2500 m / min. Subsequently, after drawing the undrawn yarn at 2.0 times,
Heat treatment was performed at 0 ° C. while changing the relaxation rate to 30%, 20%, 40%, and 0%. The sectional shape of the obtained fiber group B was 6 leaves, and the physical properties were as shown in Table 1. The dissolution rate ratio of the fiber group A to the fiber group B was 20. The fiber group B was mixed in a sea-island shape, and the alkali weight loss rate of the island component was about 8 times the weight loss rate of the sea component. Next, the fiber groups A and B were brought together and subjected to a fluid entanglement treatment using an interlace nozzle to obtain a mixed fiber. This mixed fiber was subjected to sweet twist, used as warp and weft, woven, and subjected to weight reduction processing. Table 1 shows the results of evaluating the obtained woven fabric characteristics.

[0046]

[Table 1] In Examples 1 and 2, the fiber group B had a high woven crimp due to the difference in boiling water shrinkage from the fiber group A. The fiber group A was dissolved and removed, and the fiber surface of the fiber group B had streaky grooves. The resulting fabric is soft, bulging, tight, rebounding, squeaking,
The fabric was rich in dry feeling and excellent in fibril resistance.

In Example 3, the boiling water shrinkage ratio of the fiber group B was -5.2%, and the difference in shrinkage ratio from the fiber group A and the woven crimp were large. The fabric is excellent in feeling and has good swelling, tightness and resilience. Also, it had excellent squeaky feeling, dry feeling and fibril resistance.

Further, in Example 4, since the boiling water shrinkage of the fiber group B was as high as 5.8%, the woven crimp was small, and the softness, swelling and rebound were slightly reduced. The fabric was excellent in waist feeling, squeaky feeling, dry feeling and fibril resistance.

Examples 5 and 6 and Comparative Examples 1 and 2 Spinning was carried out in the same manner as in Example 1 except that the setting temperature for drawing heat setting of the fiber group A was changed as shown in Table 2. Then, a fiber group A having 24 denier and 12 filaments was obtained. Table 2 shows the boiling water shrinkage ratio of the fiber group A and the boiling water shrinkage difference (SA-SB) between the fiber groups A and B. The fiber group A was aligned with the fiber group B in the same manner as in Example 1 and subjected to fluid entanglement to form a mixed fiber, and then a woven fabric was produced.

In Examples 5 and 6, a sufficient yarn length difference is exhibited by the difference in shrinkage between the fiber groups A and B, and the fiber group A is dissolved and removed with a hot alkaline aqueous solution to provide a soft feeling, a swelling feeling, and a tight feeling. The fabric was excellent in waist feeling, repulsion feeling, and fibril resistance, and also excellent in squeaky feeling and dry feeling due to the streaky irregularities of the fiber group B.

On the other hand, the woven fabric obtained in Comparative Example 1
By forming streaky grooves on the surface of the fiber, the feeling of creaking, dry feeling and fibril resistance were excellent, but the difference in boiling water shrinkage was as low as 7%, so that sufficient woven crimp was formed in fiber group B. No good softness, swelling and resilience could be obtained. In Comparative Example 2, the difference in the boiling water shrinkage ratio was as high as 35%, and a large crimp could be formed in the fiber group B. On the other hand, if the woven crimp was too large, problems such as fluttering and misalignment occurred. However, the quality of the fabric was significantly reduced.

[0052]

[Table 2] Examples 7 to 10 Except for changing the fiber configuration of the fiber group A and the fiber group B in Example 1 as shown in Table 3, the same procedure as in Example 1 was performed to obtain a mixed fiber, and then a woven fabric was produced.

In Examples 7 and 8, since the yarn length difference between the fiber groups A and B was sufficiently exhibited, and the woven crimp of the fiber group B was sufficiently formed, the feeling of softness, swelling, stiffness, and resilience was reduced. The fabric was excellent in fibril resistance and excellent in dry feeling and squeaky feeling.

In Example 9, the difference in shrinkage between the fiber groups A and B was sufficient, but since the weight ratio of the fiber group A was slightly small, the formability of the woven crimp of the fiber group B was slightly reduced. Although the rebound was slightly inferior, the fabric was excellent in tightness, swelling, fibril resistance, squeakyness, and dryness.

Further, in Example 10, since the weight ratio of the fiber group A was slightly large, after the fiber group A was removed by reducing the amount of alkali, the texture became slightly bumpy, but it was soft and had a swelling feeling. Excellent fibril properties, squeaky feeling,
The fabric became very dry.

[0056]

[Table 3] Examples 11 and 12 The procedure of Example 1 was repeated, except that the mixing ratio of the polymer constituting the fiber group B was changed as shown in Table 4, and the mixture was formed into a mixed fiber, and then a woven fabric was produced. In Example 11, since the yarn length difference between the fiber groups A and B was sufficiently exhibited, and the woven crimp of the fiber group B was sufficiently formed, the softness, swelling, tension, rebound, and fibril resistance were excellent. Due to the streaky irregularities of the fiber group B, the fabric was excellent in squeaky feeling and dry feeling.

On the other hand, in Example 12, the softness, swelling, stiffness and resilience were good, but the breaking strength of the fiber group B was as low as 2.0 g / d, which was a practical characteristic of tearing. The strength was slightly inferior, and the fibril resistance was also slightly inferior.

Example 13 Example 13 was repeated except that the components of the polyester constituting the fiber group A were modified polyesters having an intrinsic viscosity [η] of 0.62 and copolymerized with 3 mol% of 5-sodium sulfoisophthalic acid. Fiber group A was obtained in the same manner as in Example 1. This was combined with the fiber group B obtained in Example 1 and subjected to a fluid entanglement process to prepare a woven fabric. B of the fiber group A at this time
The alkali solubility rate ratio was 5 times. The woven fabric obtained in Example 13 had good softness, tight feeling and resilience, and was excellent in fibril resistance, squeaky feeling and dry feeling.

Comparative Example 3 In Comparative Example 3, a woven fabric was prepared in the same manner as in Example 1, except that the modified polyester was [η] 0.65 and 1 mol% of 5-sodium sulfoisophthalic acid was copolymerized. At this time, the alkali solubility rate ratio of fiber group A to B was 3 times. In the woven fabric obtained in Comparative Example 3, when the fiber group A is reduced in alkali, the fiber group B is also reduced in weight at the same time, so that the fibers in the fiber group B become thinner and tighter,
The resilience was significantly reduced.

[0060]

[Table 4] Example 14 In Example 1, spinning and drawing were performed in the same manner as in Example 1 except that the high mixer was changed from 5 stages to 20 stages.
Three-leaf cross section fiber group B having 75 denier and 36 filaments was obtained. The obtained fiber group B was mixed in a very fine sea-island shape, and the circumscribed radius of the island portion was 0.008 μm. Next, fiber group A was mixed, woven, and reduced in the same manner as in Example 1 to obtain a woven fabric. The woven fabric obtained was slightly inferior in squeakiness and dryness, but was excellent in softness, tightness, resilience and fibril resistance.

Example 15 Polyethylene terephthalate having an intrinsic viscosity [η] of 0.65 was used as a sea component, and an intrinsic viscosity [η] of 0.1 was used as an island component.
68 at 2.0 mol% of 5-sodium sulfoisophthalic acid
Using the copolymerized modified polyester, the number of islands was set to 90 using a composite spinning machine, the sea / island composite ratio was set to 75/25, and the mixture was discharged at a spinning temperature of 290 ° C. and wound at a speed of 2500 m / min. Subsequently, the undrawn yarn was subjected to drawing / relaxation heat treatment to obtain a fiber group B having a cross section of 75 denier and 36 filaments. At this time, the ratio of the dissolution rate of the polyester forming the island portion to the polyester forming the sea portion in the hot alkaline aqueous solution was about 8 times. The mixed state is compounded in a sea-island shape, and the circumscribed inner diameter D of the island portion is 0.1 mm.
The length of the island portion was 2 μm or more. This fiber group B is plied, woven using warp and latitude,
The fabric was subjected to weight reduction under the condition of 98 ° C. using a hot alkaline aqueous solution, and the woven fabric was evaluated in the same manner as in Example 1 using the fiber surface condition and the obtained fiber.

In Example 15, the streaks formed on the fiber surface were slightly large and continuous in the fiber length direction, so that the dry feeling was excellent, but the creaking and the fibril resistance were slightly inferior. Met.

Example 16 After polyethylene terephthalate having [η] = 0.65 was melted, it was discharged at a spinning temperature of 290 ° C. by a usual spinning machine and wound up at a speed of 6000 m / min without stretching.
A fiber group B having a triangular cross section of 75 denier and 36 filaments having a boiling water shrinkage of 2.9% was obtained. Further, the fiber group B was combined with the fiber group A in the same manner as in Example 1 and subjected to a fluid entanglement treatment to obtain a woven fabric. After the alkali weight loss, the fiber surface of the fiber group B showed almost no unevenness, and the squeaky feeling and the dry feeling were slightly inferior, but the woven fabric was excellent in fibril resistance, tightness, softness, and resilience.

Example 17 In Example 1, as a modified polyester component of the fiber group B, polyethylene glycol having an intrinsic viscosity [η] of 0.64, 1.0 mol% of 5-sodium sulfoisophthalic acid, and a number average molecular weight of 1,000 was used. Spinning and drawing operations were carried out in the same manner as in Example 1 except that the modified polyester obtained by copolymerizing 0.5% by weight was used to obtain a fiber group B having a cross section of six leaves of 75 denier and 36 filaments. When the cross section of the fiber was observed, the mixed portion was mixed in a sea-island shape, and the ratio of the alkali dissolution rate of the island component to the sea component was four times. This fiber group B is
The fabric was subjected to fluid entanglement with the fiber group A obtained in Example 1 and then evaluated for texture as a woven fabric. As a result, the fabric was excellent in tension, softness, swelling, and resilience. However, since the weight reduction ratio of the polymer used for the island portion and the sea portion of the fiber group B was small, the island portion and the sea portion were reduced by alkali weight loss. As the weight loss progresses almost simultaneously, clear streaks are not formed on the fiber surface,
The dry feeling was slightly inferior.

[0065]

[Table 5] Examples 18, 19 Polyethylene terephthalate having an intrinsic viscosity [η] of 0.65 as a core component, polyethylene terephthalate having an intrinsic viscosity [η] of 0.65, and 5-sodium sulfo having an intrinsic viscosity [η] of 0.68. Each of the modified polyesters copolymerized with 2.0% by mole of isophthalic acid was melted, and then melted and mixed at a weight ratio of 75/25 by a mixer equipped with a 7-stage high mixer manufactured by Toray Industries Inc. as a sheath component. The mixture was discharged at a spinning temperature of 290 ° C. at a spinning temperature of 290 ° C. and wound at a speed of 2500 m / min by a composite spinning machine at a core-sheath composite ratio shown in No. 6, and 75 denier
A core-sheath composite fiber group B having 6 filaments was obtained. At any level, the modified polyester was mixed in the form of a sea-island in the sheath component, and the ratio of the dissolution rate of the polyester forming the island portion to the polyester forming the sea portion in the hot alkaline aqueous solution was about 8 times. . Further, the thickness of the sheath component was 1 μm or more in Example 18, but in Example 1,
In No. 9, the thickness of the sheath component was 0.70 μm. The fiber group B was compared with the fiber group A obtained in Example 1 to evaluate the texture as a woven fabric after fluid processing.

In Example 18, streaky grooves were formed on the fiber surface, and the obtained woven fabric was also rich in dry feeling and squeaky feeling, and also excellent in fibril resistance, soft feeling, tight feeling and resilience. Fabric.

In Example 19, since the thickness of the sheath component was small,
The sheath component was completely dissolved and removed by the weight loss processing, and almost no streaky grooves were formed on the fiber surface,
Although slightly inferior in dry feeling and squeaky feeling, fibril resistance,
The fabric was excellent in softness, tightness, and resilience.

[0068]

[Table 6]

[0069]

The polyester shrinkage differential mixed yarn of the present invention is:
It consists of two types of fibers with different shrinkage and hot-alkali dissolution rate. High shrinkage yarn is completely removed by heat treatment during dyeing and alkali hot water treatment. There was no soft feeling, swelling feeling, tight feeling,
Can provide resilience. In addition, since the fiber group having the lower shrinkage rate has streaky irregularities formed on the fiber surface by the alkaline hot water treatment, a dry feeling and a squeaky feeling can be imparted at the same time. Also, since it has excellent fibril resistance, it can withstand the practicality of fabric.

Claims (6)

[Claims] Claims: 1. A polyester shrinkage difference mixed yarn comprising two types of fiber groups A and B having different shrinkage rates and dissolution rates in a hot alkaline aqueous solution, wherein the fiber group A for the polyester forming the fiber group B is A polyester fiber having a different shrinkage ratio, wherein the ratio of the dissolution rate of the formed polyester is 5 or more and the following (1) is satisfied. (1) 10 ≦ SA−SB ≦ 30, where SA: boiling water shrinkage rate (%) of fiber group A, SB: boiling water shrinkage rate (%) of fiber group B. 2. Polyester shrinkage difference mixed yarn composed of two types of fiber groups A and B having different shrinkage rates and dissolution rates in a hot alkaline aqueous solution, wherein the boiling water shrinkage rate SB (%) of the fiber group B is Satisfies the following (2). (2) -5 ≦ SB ≦ 5 3. A polyester shrinkage difference mixed fiber composed of two types of fiber groups A and B having different shrinkage rates and dissolution rates in a hot alkaline aqueous solution, wherein the weight ratio CA of the fiber group A in the mixed fiber is CA ( %) Satisfies the following (3). (3) 10 ≦ CA ≦ 30 4. A fiber group B constituting the polyester shrinkage difference mixed fiber is a mixture of at least two kinds of polyesters having different dissolution rates in a hot alkaline aqueous solution, and a thickness from the fiber surface of 1 μm. The polyester fiber having a fiber surface layer portion as described above, wherein the mixed portion forms a sea-island shape, and the ratio of the dissolution rate of the polyester forming the island portion to the polyester forming the sea portion is 5%.
4. The method according to claim 1, wherein
Polyester shrinkage difference mixed yarn of the description. 5. In a sea-island shape of a mixing portion of a fiber cross section,
The polyester yarn with differential shrinkage according to claim 4, wherein the circumscribed circle diameter D of the island portion is 0.01 µm or more and 1.0 µm or less. 6. In a sea-island shape of a fiber surface layer in which at least two or more types of polyester are mixed, the island extends in the fiber axis direction, and the length L is 2 μm or more and 20 μm or less. The mixed yarn of polyester shrinkage difference according to claim 4 or 5.