JPH10245722A - Conjugate polyester multifilament, polyester fabric and its production - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a polyester fabric suitable for clothing having a combination of downy hair-toned surface soft feeling and puffy feeling and firm texture and good in snag resistance. SOLUTION: This polyester fabric comprises conjugate multifilament yarn composed of two kinds of polyester differing in solubility to alkali from each other; wherein, as the polyester component easier soluble to alkali is partly dissolved, interlaminar gaps for the laminar filaments constituting the conjugate multifilaments are developed and by partly debonding the surface of the filaments, fibrils are formed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a polyester composite multifilament suitable for clothing, a fabric, and a method for producing the same. More specifically, it has a special wood grain layer-like cross-sectional structure, and polyester composite multifilament and
The fabric using it is subjected to an alkali weight reduction treatment, so-called "
The present invention relates to a polyester fabric and a processing method, which are filaments having a "crab-kamaboko" -like structure, have a new texture that combines surface softness, swelling, and swelling with a hair-like tone, and that does not cause snagging.

[0002]

2. Description of the Related Art In order to obtain a polyester fabric for clothing having a soft hair-like surface, many proposals have been made, such as using ultrafine fibers or fibril fibers. Among them,
A proposal has been made to obtain a fibrillated fiber by dividing a single yarn into a random thickness by an alkali dissolution treatment.

For example, Japanese Patent Publication No. 4-404455, Japanese Patent Laid-Open No. 1-272861, and Japanese Patent Laid-Open No. 6-278835.
In the publication, two kinds of polyesters having different alkali-solubility, after using a static kneading element to form a multifilament consisting of a single yarn randomly arranged in a single yarn cross section into a fabric, the alkali-soluble polyester component is added. Proposals have been made to obtain a silk-like polyester fabric by completely dissolving and removing the fiber into fibrillated fibers having a large number of irregular cross-sections and divided into random thicknesses.

[0004] However, a cloth made of ultrafine fibers has a drawback of lacking a swelling feeling and a stiffness while giving a soft surface feeling. The invention described in Japanese Patent Publication No. 4-40455 has the same problem. The fabric obtained by completely dissolving and removing one component in a filament in which two kinds of polyester components different in alkali solubility are randomly arranged, represented by the invention described in the publication, has a filament having a random thickness. Shows a silky texture due to the fibrillated fibers formed by splitting.

[0005] However, the cross-sectional shape of the single yarn before the dissolution treatment in the fabric described in the publication is such that the alkali-insoluble polyester component is made of two to five layers as shown in FIG. And the content of the alkali-soluble polyester component is as large as about 20 to 50%. The filament group remaining after completely dissolving and removing the alkali-soluble polyester component from the single yarn is a group of fine filaments composed of the alkali-insoluble polyester component remaining after the single yarn is divided into pieces.

[0006] For this reason, the filament group after division has a thickness several times smaller than that of the single yarn before division, and furthermore, each filament has a completely split ultrafine filament group which is independent in its length direction. Become. The fabric comprising this group of ultrafine filaments ("single-filament multifilament") is soft, but has a drawback that it becomes thin and damp due to a large amount of weight loss and lacks a swelling feeling.
In addition, there is a defect that the feeling of stiffness required as a fabric is impaired due to the weak bending characteristic of the ultrafine fibers.

On the other hand, the present inventors have filed Japanese Patent Application No.
No. 206905, in order to provide a fabric having a silky soft feeling, a swelling feeling and a squeaking feeling, at least a part of the lamination in a multilayer fiber composed of two polyesters having different alkali solubility. Has a curved structure with one opening, and obtains a multilayer fiber in which the center point of the opening is eccentric from the center of the single yarn, and selectively dissolves the easily soluble polyester with a low concentration of alkali. It was proposed to dissolve and remove. However, according to the proposal, the content ratio of the alkali-soluble polyester component is as high as about 20% by weight or more, and since the component is selectively completely dissolved and removed, a material having an excellent soft feeling and a multilayer fiber are obtained. It was divided into fine fibrils, and it was now one step short to obtain the swelling feeling. In addition, there is a drawback that pilling occurs on the surface of the fabric during wearing of the fabric due to the fine fibrils, which is inferior in so-called snagging property.

Japanese Patent Application Laid-Open No. 63-165554 discloses a fabric obtained by partially dissolving and removing one component of a filament in which two kinds of polyester components having different alkali solubility are randomly arranged. In this fabric, the alkali-soluble polyester component is completely dissolved and removed, and a filament group having a random thickness composed of the alkali-insoluble polyester component remaining and the alkali-soluble polyester component are dissolved. Instead, a filament group in which two types of polyester components are joined is mixed.

However, this fabric is similar to the above-mentioned Japanese Patent Publication No. 4-4.
In the invention described in Japanese Patent No. 0455, it is obtained by making the alkali weight reduction treatment insufficient so as to incompletely dissolve the alkali-soluble polyester component, and the filament group after splitting contains the alkali-soluble The only difference is that the polyester component is included, and each filament is a group of ultrafine filaments that are completely split independently in the length direction. Therefore, the fabric composed of this group of ultrafine filaments ("single yarn multifilament") is also similar to the fabric described in Japanese Patent Publication No. 4-40455.
On the other hand, although it is soft, it has a drawback that it becomes thin and damp due to a large amount of weight loss and lacks a swelling feeling. In addition, there is a defect that the feeling of stiffness required as a fabric is impaired due to the weak bending characteristic of the ultrafine fibers.

[0010] As described above, the surface soft feeling of the hair-growing tone and
The feeling of swelling and the feeling of stiffness are in a trade-off relationship, and there has been a strong demand for the appearance of a polyester fabric that combines the two, and that does not cause snagging.

[0011]

SUMMARY OF THE INVENTION The present inventors have overcome the difficulties of the two trade-offs, and have a new texture that combines the surface softness, swelling, and stiffness of the hair growth tone, and also causes snagging. Intensive study was conducted with the aim of obtaining a polyester fabric without any. As a result, the composite multifilament composed of layered filaments having a special grain-grained laminar cross section is used as a fabric, and the rate of weight reduction of the hardly soluble polyester component in the alkali weight loss treatment of the fabric is smaller than that of the easily soluble polyester component. By performing a specific treatment of reducing the weight under large high-concentration alkali treatment conditions, the alkali-soluble polyester component partially dissolves, and as a result, voids are formed between the layers of the layered filament, and the surface thereof is formed. It has been found that a polyester fabric composed of filaments having a unique structure, such as a "kanabama", in which fibrils are formed by partial exfoliation, can solve the above-mentioned problems, leading to the completion of the present invention. Was.

That is, an object of the present invention is to provide a polyester fabric which has a new texture which has both a softness, a swelling, and a swelling feeling of a hair growth tone, and which does not cause snagging.

[0013]

Means for Solving the Problems The first aspect of the present invention is that it is composed of two kinds of polyesters having different alkali solubilities, and has a cross-sectional structure in which the alkali easily soluble polyester component is a layer having a thickness of 1 μm or less. It is a polyester composite multifilament characterized in that it is arranged in ten or more layers of a wood grain layer, and a part of the layer is composed of a layered filament having an opening.

A second aspect of the present invention is a polyester fabric having a polyester composite multifilament composed of two kinds of polyesters having different alkali solubilities,
A void is present between the layers of the layered filaments constituting the polyester composite multifilament by partially dissolving the alkali-soluble polyester component, and fibrils are formed by partially exfoliating the surface thereof. Polyester fabric.

A third aspect of the present invention is that the polyester is composed of two kinds of polyesters having different alkali solubilities, and whose cross-sectional structure is a layer having a thickness of 1 μm or less in the alkali-soluble polyester component and a grain size of 10 layers or more. After being knitted and woven using at least a part of a polyester composite multifilament composed of a layered filament in which a part of the layer is provided with an opening, the alkali reduction treatment is performed. This is a method for producing a polyester cloth.

Hereinafter, the present invention will be described in detail. In the present invention, a polyester is a polyester such as polyethylene terephthalate, polybutylene terephthalate, or polyethylene naphthalate, or a polyester component such as isophthalic acid, adipic acid, dodecane diacid,
These include those obtained by copolymerizing acid components such as sulfoisophthalic acid and cyclohexanedimethanol, and glycol components such as diethylene glycol, propylene glycol and polyethylene glycol.

It is necessary that the two polyesters used in the present invention have different alkali solubility. The difference in alkali solubility means that there is a difference in resistance to alkali used for hydrolysis. The alkali solubility differs depending not only on the two types of polyester but also on the alkali dissolution conditions. However, if the polyester itself does not have a dissolution rate difference, it is difficult to produce a dissolution rate difference no matter how alkaline dissolution conditions are selected.

For example, as a combination of polyesters satisfying the above conditions, a single polyester such as polyethylene terephthalate and polybutylene terephthalate is used as a polyester component having low alkali solubility. Most commonly, polyethylene terephthalate is used. On the other hand, examples of the alkali-soluble polyester component include a block polyester ester obtained by copolymerizing polyethylene glycol having an average molecular weight of 600 to 6000 as an alcohol component of these polyesters, and an alkaline earth sulfoisophthalic acid as an acid component. A polyester obtained by copolymerizing a metal salt in an amount of 2 mol% or more, or a copolymer polyester obtained by combining these two components is preferable.

Particularly, a block polyether ester obtained by copolymerizing polyethylene glycol at 15% by weight or more, preferably 20% by weight or more has a high alkali dissolution rate, and is therefore suitable as the alkali-soluble polyester component used in the present invention. is there. In these polyesters, a small amount of matting agent within a range that does not impair the purpose of the present invention,
It may contain a coloring agent, a flame retardant, a stabilizer and the like.

The first aspect of the present invention consists of two kinds of polyesters having different alkali solubility, and the cross-sectional structure thereof is a layer having a thickness of 1 μm or less in the alkali-soluble polyester component and a grain pattern of 10 layers or more. And a part of the layer is composed of a layered filament having an opening.

FIG. 1 schematically shows an example of a cross-sectional structure of such a wood grain layered filament. As can be seen from FIG. 1, the wood-grain layered filament in the present invention is composed of two kinds of polyesters, and the alkali-soluble polyester component is arranged and laminated in a wood-grain layer shape in a single yarn cross section. In the present invention, the thickness of one layer of the wood grain layer structure in the cross section of the layer filament is required to be 1 micron or less.

When the thickness of the layer exceeds 1 micron, the weight of the alkali-soluble polyester component is easily reduced by alkali, and the object of the invention is not achieved. Preferably, it is between 0.01 and 0.5 microns. The thickness of the layers need not be uniform for each layer, but rather is preferably non-uniform.

The number of layers needs to be 10 or more. If the number of layers is less than 10, the layered filaments after the alkali weight reduction treatment are split apart, and the surface soft feeling aimed at by the present invention cannot be obtained. The preferred number of layers is about 20 to 50 layers. Furthermore, in the present invention, in addition to the above, the alkali-soluble polyester component needs to be arranged in a woodgrain layer in the cross section of the layered filament. As shown in FIG. 1, the wood grain layer means a state in which the wood grain is arranged in a pattern like a wood grain. In addition, it is necessary that a part of the layer has a curved structure in which a single yarn cross section is opened somewhere. In FIG. 1, the opening represents, for example, between AB and the end of the opening is exposed on the surface of the single yarn. With such a structure, at the time of the alkali weight reduction treatment, the alkali comes into contact with the alkali-soluble polyester component, and the polyester component is dissolved. When the laminates are arranged concentrically, for example, alkali reduction treatment is almost impossible, and the object of the present invention is not achieved.

In the layered filament, the center of the opening of the layer is preferably eccentric from the center of the filament. The central point of the opening means, for example, a middle point from the end of the opening in the layer of the easily soluble polyester component as shown in FIG. 1C. By knitting and weaving layered filaments having such a structure and performing alkali weight loss treatment,
A void is formed between the layers of the layered filament, and in combination with the unique structure that the center point of the opening of the layer is eccentric from the center of the filament, the layered filament has a greatly expanded structure, which is an object of the present invention. The feeling of swelling and stiffness is obtained.

Further, the lamination shape of the cross section of the single yarn does not need to be the same between the layered filaments, but rather it is preferable that the filaments are not the same for each filament in order to achieve the object of the present invention. Further, the cross-sectional shape of the layered filament in the present invention may be a round cross-section, a triangular cross-section, or another irregular cross-sectional shape. In the present invention, the content ratio of the alkali-soluble polyester component is preferably 20% by weight or less. When the content ratio of the alkali-soluble polyester component exceeds 20% by weight, the weight of the alkali-soluble polyester component is easily reduced at the time of alkali weight reduction treatment, and the filament is completely split into fibrils. Swelling and stiffness are impaired. 5% by weight of alkali-soluble polyester component
-15% by weight is more preferred for achieving the object of the present invention.

The polyester composite multifilament of the present invention has a low content ratio of the alkali-soluble polyester component in combination with the special multigrain layer as described above. By subjecting the used fabric to an alkali weight reduction treatment, it becomes possible to obtain a polyester fabric having a unique structure that has not been achieved in the past.

[0027] The polyester composite multifilament of the present invention is obtained by applying Japanese Patent Application No. 7-2069 filed earlier by the present inventors.
It is manufactured according to No. 05. That is, two kinds of polyesters having different alkali solubility are spun by a known composite spinning method. In spinning, two kinds of polyesters are kneaded by passing through a static kneading element provided in the spinneret. The static kneading element uses 4 to 8 elements. When the mixing ratio of the two polyesters is as small as 90/10, 6 to 10 static kneading elements are preferably used.

The two types of polymers A and B having different alkali solubilities are respectively kneaded by a static kneading element after passing through a filtration section. By this static kneading element, both the A and B polymers are laminated into 10 or more layers. After being laminated in multiple layers by a static kneading element, the mixture enters a capillary through a narrow horizontal flow path, flows out of a spinning hole, and is formed by discharge as a layered filament.

In the spinneret, the laminar flow enters a capillary which is bent at almost right angle from a narrow horizontal flow path,
A wood grain layered structure, which is a feature of the layered filament in the present invention, is formed. In this narrow horizontal flow path, the laminar flow receives shearing force. The shear rate is about 30 (1 /
Second) or more, preferably 100 (1 / second) or more.

Since the distance from the static kneading element to the capillary is different for each spinning hole, the shearing force applied to each filament is different, and the grain shape of each filament is different. Static kneading elements used for spinning are, for example, Kenics "static mixer",
Known devices such as a “mixing unit” manufactured by Toray Engineering Co., Ltd. and a mixing element manufactured by Sluzer Co., Ltd. are used.

For general purposes, Kenics "static mixer" is used. The layered filament discharged and formed from the spinning hole is wound and wound and stretched. Winding and stretching may be performed in separate steps or may be continuous. Further, it is also possible to omit the stretching step as in the case of high-speed spinning. The second aspect of the present invention is a polyester fabric using at least a part of a polyester composite multifilament composed of two kinds of polyesters having different alkali solubilities, wherein an alkali-soluble polyester component partially dissolves. Thus, a polyester fabric is characterized in that voids exist between the layers of the layered filaments constituting the polyester composite multifilament, and fibrils are formed by partially exfoliating the surface.

The polyester fabric of the present invention is obtained by knitting and weaving the polyester composite multifilament having the above-described specific structure and subjecting it to alkali-reducing treatment under specific conditions. A void is present between the layers of the layered filaments constituting the polyester composite multifilament due to partial dissolution of the polyester component, and fibrils are formed by partially exfoliating the surface. There is a great feature in that it is composed of a polyester composite multifilament having a unique structure like "".

FIG. 2 is a schematic diagram showing the form of layered filaments in the polyester composite multifilament constituting the polyester fabric of the present invention. As described above, the fact that voids exist between the layers of the layered filaments constituting the composite multifilament means that the alkali-soluble polyester component arranged in the wood grain layer in the layered filaments partially dissolves by the alkali weight reduction treatment, A state in which voids are formed between the layers of the layered filament.The voids are discontinuous in the length direction of the filament, so the layered filament is not in a state of being split apart, but in a layered state. The filaments are integrated in the longitudinal direction. In addition, the voids formed by dissolving the readily soluble alkali polyester component arranged in the woodgrain layer in the layered filaments form a structure in which the layered filaments are greatly expanded, and a unique swelling and stiffness, which is the object of the present invention. Is obtained.

Another feature of the polyester fabric of the present invention is that, as a result of the formation of voids between the layers of the above-mentioned layered filaments, fibrils are formed by partially exfoliating the surface. The term "fibril" as used herein refers to a state in which the surface of the layered filament is partially peeled off and is separated from the fabric into a thin skin or a thin fibrous shape.
The fibrils have a flat shape with a size of about 0.5 to 2 microns in thickness and about 1 to 10 microns in width.
It is preferred that about 1 to 30 fibrils per 100 micron square are present on the surface of the fabric from the viewpoint of surface softness and the like. More preferably, the number is 5 to 20.

In the polyester fabric of the present invention, while the presence of the fibrils gives the fabric a soft and soft surface appearance, the fabric as a whole has a new texture with a unique swelling and stiffness, and snagging. There is a great feature in the place where does not occur. Just fine fibers,
As disclosed in Japanese Examined Patent Publication No. 4-40455 or the like, one in which a single yarn is completely divided to form an ultrafine single fiber of a "single yarn multifilament group" lacks a swelling feeling and a feeling of stiffness. Is not achieved. Further, snagging is likely to occur.

Further, even if the fiber described in JP-B-4-40455 is simply made incompletely to reduce the weight and the alkali-soluble polyester component is left, the above-mentioned JP-A-63-165554 describes the same. Like the fabric of
The effect of the present invention cannot be obtained. In the polyester fabric of the present invention, discontinuous voids are formed in the longitudinal direction of the fiber between layers of the layered filaments constituting the polyester composite multifilament after the alkali weight reduction treatment, and the surface of the layered filament is peeled off to form fibrils. Have been. A specific amount of the alkali-soluble polyester component remains in the layered filament.

The content of the alkali-soluble polyester component remaining in the layered filament after the alkali weight reduction treatment is preferably 1 to 8% by weight. If the content is less than 1% by weight, the split fiber will not be smooth, swelling and stiffness will be insufficient, and snagging will easily occur. 8% by weight
It is not preferable to exceed the value, because the surface softness of the hair growth tone is reduced.

The preferred content of the remaining alkali-soluble polyester component is 3 to 6% by weight. The polyester fabric of the present invention may be composed of the polyester composite multifilament alone, or may be used by mixing with other fibers. In particular, it is preferable to form a fabric by blending with a polyester multifilament having a higher shrinkage ratio than the polyester composite multifilament, such as a known different shrinkage mixed fiber, since the swelling feeling is further improved. In this case, the mixing ratio of the polyester composite multifilament is preferably 20 to 70%, more preferably 50 to 70%.

Next, the third invention of the present invention will be described. The third invention of the present invention is composed of two kinds of polyesters having different alkali solubilities, and has a cross-sectional structure in which the alkali easily soluble polyester component is a layer having a thickness of 1 μm or less and a grain pattern of 10 or more layers. After being knitted and woven using at least a part of a polyester composite multifilament made of a layered filament having a part of the layer and having one opening, the alkali reduction treatment is performed. This is a method for producing a polyester cloth.

The form of the fabric using the polyester composite multifilament described above may be any of a woven fabric and a knitted fabric. In the case of woven fabric, it is used for one or both of warp and weft. In addition, the fabric can be used by combining a polyester composite multifilament with another fiber. The mating partner is not limited to polyester fiber, but may be polyamide or other synthetic fibers. Such a composite may be mixed in a filament state,
Mixing and weaving are also acceptable.

The production method of the present invention is characterized in that the alkali dissolution rate of two kinds of polyester components is reversed by subjecting a layered filament having a special shape formed by knitting and weaving to a fabric to an alkali reduction treatment. There is a great feature where it comes. Such a reversal phenomenon can be realized only by a combination of a peculiar wood grain layered structure of the layered filament constituting the polyester composite multifilament according to the first invention and alkali reduction treatment conditions.

The weight loss rate ratio between the two polyester components is as follows:
As will be described later, the content can be easily determined by analyzing the content of the alkali-insoluble polyester component and the alkali-soluble polyester component in the polyester composite multifilament after the alkali weight reduction treatment.
The weight loss rate ratio is a value obtained by dividing the weight loss rate of the alkali-soluble polyester component by the weight loss rate of the alkali-soluble polyester component.

In the present invention, it is preferable to carry out weight reduction treatment under the condition that the alkali weight reduction rate ratio of the two polyester components is 1 to 5 times. By performing the weight reduction under the condition that the weight reduction rate ratio is 1 to 5 times, discontinuous voids are formed in the longitudinal direction of the fiber between the layers of the layered filaments constituting the polyester composite multifilament, and the surface of the layered filament is reduced. Exfoliates to form fibrils. If the weight loss rate ratio is less than 1, the alkali-soluble polyester component in the layered filaments is preferentially reduced in weight, and the layered filaments are split apart, resulting in the swelling and stiffness, which is the object of the present invention. Can not be obtained. A more preferred weight loss rate ratio is 2 to 4 times.

In the present invention, the amount of alkali reduction treatment is 40% or less, preferably 5 to 35%, more preferably 10 to 25% as a whole cloth. Most preferably, when the weight loss rate of the entire fabric is 10 to 25%, the weight loss rate of the slightly alkali-soluble polyester component is 5 to 20%, and the weight loss rate of the alkali-soluble polyester component is 5 to 8%.

The alkali reduction treatment is preferably performed under a high-concentration alkaline condition. Examples of the type of alkali include known sodium hydroxide and potassium hydroxide. As the alkali concentration, a high concentration of 3 to 10% by weight is preferably adopted. More preferred alkali concentration is 5-1.
0%. In addition, a high temperature of 80 to 100 ° C, more preferably 90 to 100 ° C, is adopted as the processing temperature.

The time for the weight reduction treatment is selected according to the weight reduction rate of the cloth, and usually 10 to 30 minutes, more preferably 10 to 20 minutes, is adopted to make the weight reduction rate 10 to 20% by weight. In contrast to the processing method of Japanese Patent Application No. 7-206905 in which the processing is carried out under a low alkali weight loss condition such as a weak alkali such as sodium carbonate or sodium hydroxide having a concentration of 2% by weight or less, the present invention provides a high concentration, It is characterized by high temperature conditions.

In the alkali weight reduction treatment according to the present invention, it is preferable to carry out the weight reduction treatment in a spread state. When the treatment is carried out in a rubbing state, the physical action other than the alkali weight reduction becomes excessive, and the bridge portion is cut, and the swelling feeling and the stiffness of the fabric may be reduced. However, both can be used together as long as the object of the present invention is not impaired.
Hereinafter, the present invention will be described in more detail with reference to examples. The present invention is not limited to the embodiment.

[0048]

EXAMPLES In this example, each measurement was performed by the following method. (Alkali weight loss rate) The alkali weight loss rate of the entire fabric was calculated as follows. The weight of the sample before alkali weight reduction
1 (g), the weight of the sample after the weight loss treatment is W2 (g),
The alkali loss rate was calculated by the following equation.

Alkali weight loss rate (%) = ((W1-W2)
/ W1) × 100 (weight loss rate ratio) Quantitative analysis of the copolymer component in the alkali easily soluble polyester was performed by ¹ H-NMR, and the alkali poorly soluble polyester component corresponding to the weight loss rate of the fabric and the alkali easy solubility were determined. The rate of weight loss of each of the polyester components was measured.

In this example, a copolymer of polyethylene glycol having an average molecular weight of 4000 was used as the alkali-soluble polyester component. The measurement conditions of ¹ H-NMR were as follows. Apparatus Bruker AC-200P Observation width 3025 Hz Pulse width 4.5 μsec pulse Repetition time 3 sec Integration number 128 times Measurement temperature 25 ° C. Reference substance tetramethylsilane In this case, a signal of polyethylene glycol is detected at 4.0 ppm. From this signal and the signal of polyethylene terephthalate, the integrated area ratio was determined by a standard method, and the content of the alkali-soluble polyester component in the fabric was calculated. (Hand) The hand of the plain fabric was evaluated by three experienced engineers.

The softness, swelling and stiffness were evaluated, and those having a softness, swelling and stiffness were evaluated as 、, those having a slight feeling were evaluated as ○, and those lacking at least one were evaluated as ×. (Snugging property) It evaluated according to JIS-L1058.

The frequency of occurrence of pills was determined by the method A, and a grade 3 or higher was judged to be acceptable.

[0053]

Example 1 As an alkali-insoluble polyester component, an intrinsic viscosity of 0.65 (in orthochlorophenol, 1
(Measured in% by weight) of polyethylene terephthalate as an easily soluble polyester component having a molecular weight of 6,000.
A block polyetherester having an intrinsic viscosity of 0.80, obtained by copolymerizing 25% by weight of polyethylene glycol and 1% by weight of a sodium salt of sulfoisophthalate, was used.

Each of the polyesters was weighed with a metering pump using a biaxial composite spinning machine, and spun at a ratio of 90:10 by weight. Eight static kneading elements manufactured by Kenix were arranged in the spinneret, and both components were mixed. The shear rate in the horizontal flow path after passing through the static kneading element is 40 (1
/ Sec). It is extruded from a spinning hole having 24 holes at a spinning temperature of 285 ° C., spun at 2,000 m / min to form an undrawn yarn, and then continuously drawn 2.3 times without being wound, and is a 75d / 24f polyester composite. A multifilament was obtained.

After embedding the obtained polyester composite multifilament in an epoxy resin, the ultrathin section was dyed with osmic acid by a standard method, and the cross section of the layered filament in the ultrathin section was observed with a transmission electron microscope (JEM- manufactured by JEOL Ltd.). 20
(00FX) at a magnification of 2000 times, stretched to 1.2 times and observed. From the photograph of the cross section, the alkali-soluble polyester component was arranged in a wood grain layer in the cross section of the layered filament. The thickness of one layer measured from this cross-sectional photograph was about 0.01 to 0.5 microns, and the number of layers was 46.

Using this polyester composite multifilament, the warp was twisted at a rate of 250 turns / m to obtain a plain weave of 117 warp / inch and 96 wefts / inch. The alkali weight reduction treatment was performed at 98 ° C. for 18 minutes using an aqueous solution of 4% by weight of sodium hydroxide in a spread state of the cloth. At this time, the alkali weight loss rate of the fabric was 24.4%.
And the content of the alkali-soluble polyester component in the fabric was 3.3% by weight. Therefore, the weight loss rate of the alkali-insoluble polyester was 16.9% by weight, and the weight loss rate of the alkali-soluble polyester was 7.5%.
The weight loss rate ratio between the alkali-soluble polyester component and the alkali-soluble polyester component was 2.3 times.

The surface of this cloth was sampled at five points in an unspecified manner, and the sample was photographed with a scanning electron microscope (S-570, manufactured by Hitachi, Ltd.) at a magnification of 500 times and observed at 1.5 times magnification. On the surface of the fabric, there were an average of 12 flat fibrils having a thickness of about 0.5 to 1 micron and a width of about 1 to 10 microns per 100 micron square.

This cloth had a sufficient feeling of stiffness in addition to the softness and swelling of the hair in a hairy tone. Moreover, the snagging property was class 4 and was able to sufficiently withstand actual wearing.

[0059]

Examples 2 to 4, Comparative Example 1 The woven fabric of Example 1 is used in Example 1.
At the time of performing the alkali weight reduction treatment under the same conditions as described above, the weight reduction time was adjusted to change the weight loss rate as shown in Table 1.
Table 1 shows the characteristics of the obtained woven fabric. FIG. 3 shows the rate of weight loss of the poorly alkali-soluble polyester component and the easily-soluble alkali polyester component obtained from Examples 1 to 4.
As can be seen from FIG. 3, in the present invention, the weight loss rate of the poorly soluble alkali component is greater than that of the alkali-soluble polyester component.

As is clear from this example, in the polyester fabric of the present invention, voids exist between the layers of the layered filaments constituting the composite multifilament due to partial dissolution of the alkali-soluble polyester component. ,
A structure in which fibrils are formed by partially exfoliating the surface is formed. The content of the alkali-soluble polyester component remaining in the fabric after the alkali weight-reducing treatment falls within the range of the present invention, which has both a good soft hairy surface soft texture, a swelling feeling, and a stiffness feeling. Was. Also, the snagging properties were good.

On the other hand, as shown in Comparative Example 1, when the weight loss rate was excessive, the easily alkali-soluble polyester component did not remain in the fabric, and the fibers were split apart, the softness of the hair had a soft surface. However, the fabric lacked the swelling and stiffness of the fabric. Furthermore, the snagging property was also poor.

[0062]

COMPARATIVE EXAMPLE 2 The alkali-insoluble polyester and the alkali-soluble polyester used in Example 1 were mixed in a weight ratio of 70%.
The yarn was spun at a ratio of 30. In the spinneret, the same static kneading element as in Example 1 was arranged in two elements, and both components were mixed to obtain a 75d / 24f polyester composite multifilament in the same manner as in Example 1.

A photograph of a cross section of the obtained composite multifilament was taken in the same manner as in Example 1. From this cross-sectional photograph, in the cross-section of the filament, the alkali-soluble polyester component did not form a wood grain layer, and
In the same manner as the cross-sectional configuration shown in FIG. 3 of Japanese Patent No. 455, the alkali-soluble polyester component is wrapped with the alkali-soluble polyester component, and the alkali-soluble polyester component exists independently as islands of "sea islands". Was.

Next, this polyester composite multifilament was made into a plain woven fabric as in Example 1, and the woven fabric was reduced in alkali. The weight loss rate of the entire fabric was 34% by weight, and the content of the alkali-soluble polyester component in the fabric was 0% by weight. Therefore, the weight loss rate of the alkali-insoluble polyester component was 4% by weight, and the weight loss rate of the alkali-soluble polyester component was 30% by weight.

When the surface of this cloth was observed with a scanning electron microscope in the same manner as in Example 1, the surface had an average of 30 fibrils per 100 micron square and showed a soft hand, but the whole cloth was thin. It lacked swelling and stiffness. In addition, the snagging property was poor at class 1.

[0066]

[Table 1]

[0067]

The polyester fabric of the present invention is obtained by partially dissolving the alkali-soluble polyester component.
Voids exist between the layers of the layered filaments constituting the composite multifilament, and a structure in which fibrils are formed by partially exfoliating the surface is formed.
From this, it has become possible to obtain a polyester fabric which has a surface softness, a swelling feeling, and a swelling feeling of a hair growth tone which have not been obtained conventionally, and also has a good snagging property.

[Brief description of the drawings]

FIG. 1 is a schematic diagram showing a state of a cross section of a layered filament constituting a polyester composite multifilament before an alkali weight reduction treatment of the present invention.

FIG. 2 is a schematic view showing a state of a cross section of a layered filament constituting the polyester fabric of the present invention.

FIG. 3 is a diagram showing the alkali weight loss rate ratio between the poorly soluble polyester component and the readily soluble polyester component in the polyester fabric of the present invention.

[Explanation of symbols]

 A, B: End of opening C: Center point of opening

Claims (6)

[Claims] 1. A cross-sectional structure composed of two kinds of polyesters having different alkali solubility, wherein the alkali-soluble polyester component is a layer having a thickness of 1 μm or less and is arranged in a wood grain layer of 10 layers or more. A polyester composite multifilament comprising a layered filament having a part of the layer and having an opening. 2. A polyester fabric using at least a part of a polyester composite multifilament composed of two kinds of polyesters having different alkali solubilities, wherein an alkali-soluble polyester component is partially dissolved. A polyester fabric, wherein voids exist between layers of the layered filaments constituting the polyester composite multifilament, and fibrils are formed by partially exfoliating the surface. 3. The polyester fabric according to claim 2, wherein the polyester composite multifilament contains 1 to 8% by weight of an alkali-soluble polyester component. 4. The polyester fabric according to claim 2, wherein a polyester multifilament having a higher shrinkage than the polyester composite multifilament is mixed or knitted. 5. A cross-sectional structure composed of two kinds of polyesters having different alkali-solubility, wherein the cross-sectional structure is such that 10 or more layers of a readily-soluble alkali polyester component having a thickness of 1 μm or less are provided in a woodgrain layer. And knitting and weaving using at least a part of a polyester composite multifilament composed of a layered filament having a part of the layer having an opening, and then performing an alkali weight reduction treatment. . 6. The method for producing a polyester fabric according to claim 5, wherein the alkali weight reduction treatment is performed at an alkali concentration of 3 to 10% by weight.