JP3029682B2 - Composite fiber aggregate having excellent retardation crimp - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a polyethylene terephthalate copolymer of isophthalic acid copolymer, a polyethylene terephthalate polyester of an alkylene oxide adduct of bisphenol A or a copolymer of both, and a polyethylene terephthalate copolymer. Since the composite shape of the two types of polymers is substantially the same in the length direction of the fibers but different between the fibers, it has a crimped shape having a phase difference between the fibers. The present invention relates to an aggregate of composite fibers having natural swelling, bulkiness, and soft and soft texture similar to natural fibers.

[0002]

2. Description of the Related Art Conventionally, synthetic fibers such as polyester,
Fiber structures such as woven, knitted and non-woven fabrics made of polyamide filaments have a better texture and gloss than natural fibers such as cotton and hemp because the single filament denier and cross-sectional shape of the constituent filaments are monotonous. It was monotonous and cold, and the quality as a fiber structure was low.

[0003] In recent years, various attempts have been made to improve the drawbacks, such as deforming the fiber cross section, crimping, and composite fibers. However, at present, the objectives have not yet been sufficiently achieved. is there. For example, JP-A-56-165015,
JP-A-57-5921, JP-A-58-98425,
A composite fiber of an easily soluble polymer and polyester is formed as described in JP-A-61-239010 and the like, and then a post-processing is performed to give a dry touch feeling and a unique gloss. It is applied to woven or knitted fabric, or JP-B-51-7207, JP-A-58-70711.
And Japanese Patent Application Laid-Open No. Sho 62-133118, Japanese Patent Publication No. Sho 53-35633, and Japanese Patent Publication No. Sho 56-33118 to improve the feeling by imparting unevenness in the fiber length direction.
A method of improving the feeling by fibrillating synthetic fibers as shown in Japanese Patent Publication No. 16231 and the like, false twisting as proposed in Japanese Patent Publication No. 45-18072,
A method of preparing a fused yarn and imparting a hemp-like shiny feeling, or a method of preparing a mixed fiber fused yarn as described in JP-A-63-6123, or
Various methods such as a method of fibrillation as described in JP-A-3-6161 have been proposed. However, it cannot be said that it is sufficient to impart a feeling similar to natural fibers to synthetic fibers. In particular, it is insufficient to impart a feeling similar to natural wool fibers or natural cotton fibers.

[0004]

DISCLOSURE OF THE INVENTION The present invention relates to a conventional polyester fiber which has a swelling, bulkiness and soft feeling similar to natural fibers such as wool or silk, and a random natural texture between single fibers. As a result of intensive studies for the purpose of imparting irregular spots and phase difference crimps, the present invention has been achieved. That is, the present invention has clarified what kind of material should be used and what kind of configuration and condition should be used in order to obtain the above fiber.

[0005]

SUMMARY OF THE INVENTION The present invention relates to a composite comprising a polyethylene terephthalate-based polyester (A) in which isophthalic acid is copolymerized in an amount of 4 to 20 mol% based on the total acid component, and a substantial polyethylene terephthalate (B). An assembly of fibers, wherein the weight ratio of the component (A) and the component (B) constituting the composite fiber is in the range of 10:90 to 90:10, and the component (A) constituting the composite fiber is The fiber cross-section composite shape of the component (B) is substantially the same in the length direction of the fiber, and each of the composite fibers shown in the following (a), (b) and (c) is the fiber It is a fiber aggregate having an excellent retardation crimp characterized by being contained in the aggregate. (A) A composite fiber in which one of the component (A) and the component (B) is a large lump occupying 50% or more of the fiber cross-sectional area and is unevenly distributed in the cross section; Neither component (B) nor component (B) exists in the cross section as a large lump occupying 50% or more of the cross-sectional area of the fiber, and component (A) and component (B) cross the fiber at the center of radiation. Composite fiber with a radially bonded structure placed on the surface,
(C) Neither the component (A) nor the component (B) is present in the cross section as a large lump occupying 50% or more of the fiber cross-sectional area, and the component (A) and the component (B) Composite fiber, which is not a radially bonded structure in which the center of radiation is located in the fiber cross section, or as the component (A) constituting the fiber aggregate of the present invention. The object of the present invention can be attained by using a polyethylene terephthalate-based polyester obtained by copolymerizing an alkylene oxide adduct of bisphenol A with 4 to 20 mol% based on all glycol components. Further, the component (A) is a polyethylene terephthalate-based polyester obtained by copolymerizing both an isophthalic acid and an alkylene oxide adduct of bisphenol A, and the copolymer mole% of isophthalic acid is a Mole%,
When the copolymer mol% of the alkylene oxide adduct of bisphenol A is b mol% with respect to all diol components, the object of the present invention is achieved even if a polyester having a + b in the range of 4 to 20 is used. .

In the present invention, the polyester (A) is a polyethylene terephthalate polyester obtained by copolymerizing an isophthalic acid component in an amount of 4 to 20 mol% with respect to the total acid component, or an alkylene oxide addition of bisphenol A with respect to the total glycol component. The product is a polyethylene terephthalate-based polyester copolymerized with 4 to 20 mol%, or both are a polyethylene terephthalate-based polyester copolymerized with a total amount of 4 to 20 mol%, and the remaining constituent units are substantially polyethylene terephthalate units. Certain polyesters are preferred, but may contain some components other than the alkylene oxide adduct of isophthalic acid or bisphenol A, terephthalic acid and ethylene glycol components. For example, other components include pentasodium sulfoisophthalic acid, naphthalenedicarboxylic acid, diphenyldicarboxylic acid, β-oxyethoxybenzoic acid, p-oxybenzoic acid, bifunctional aromatic carboxylic acids such as phthalic acid, sebacic acid, Bifunctional aliphatic carboxylic acids such as azelaic acid, adipic acid, oxalic acid, 1,4
A bifunctional alicyclic carboxylic acid such as cyclohexanedicarboxylic acid; Further, a part of the glycol component of the polyester may be replaced with a glycol component other than ethylene glycol. Examples of the glycol component include 1,4-butanediol, neopentyl glycol, and 3-methyl-1,5-pentane. Diol, 1,4-cyclohexanedimethanol, 1,9
-Nonanediol and 2-methyl-1,8-octanediol, bisphenol A, bisphenol S, aliphatic, alicyclic and aromatic diol compounds such as polyethylene glycol. However, alkylene oxide adducts of isophthalic acid or bisphenol A,
Components other than the terephthalic acid and ethylene glycol components are preferably within 5 mol%, particularly preferably within 3 mol%.

Further, the copolymerization amount of isophthalic acid of the polyester (A) needs to be 4 mol% or more. When the amount is less than 4 mol, a crimped form having a phase difference between fibers, which is the object of the present invention, does not appear, and a fiber aggregate having sufficient swelling and bulkiness cannot be obtained. The reason will be described later, but since the crystallization speed of the polyester (A) is closer to that of the other polyester (B), the difference in shrinkage between the two components does not sufficiently appear, and the desired product is not obtained. It is considered impossible to obtain. On the other hand, if it exceeds 20 mol%, the crystallinity of the polyester is extremely reduced, and the polyester becomes substantially an amorphous polymer, the heat resistance is extremely reduced, and the polyester cannot be used as a material for clothing. At the same time, the fiberization processability deteriorates, and especially the drawing processability becomes poor, and fluff and yarn breakage increase. Further, a phenomenon in which the physical properties of the fiber such as the fiber strength deteriorates occurs, which is not preferable. When an alkylene oxide adduct of bisphenol A is used as a copolymer unit, the copolymerization amount must be 4 to 20 mol%. The reason is the same as in the case of isophthalic acid. The same applies to the case where an alkylene oxide adduct of bisphenol A is used in combination with isophthalic acid. As the alkylene oxide adduct of bisphenol A, a compound in which 1 to 2 mol of alkylene oxide, preferably ethylene oxide is added to each hydroxyl group of bisphenol A is preferable. The polyester (A) may contain a small amount of additives, fluorescent whitening agents, stabilizers, ultraviolet absorbers, matting agents, and the like.

The other composite component, polyester (B), needs to be substantially polyethylene terephthalate. Some third component may be contained. For example, difunctional dicarboxylic acid components such as pentasodium sulfoisophthalic acid and naphthalenedicarboxylic acid;
-Butanediol, 1,6-hexanediol, 1,4
-Diol components such as cyclohexanedicarboxylic acid. However, if the oriented crystallization speed approaches that of the polyester (A), the intended fiber cannot be obtained. Therefore, it is desirable that the third component copolymerization amount of the polyester (B) is as small as possible. The polyester (B) may contain a small amount of additives, fluorescent whitening agents, stabilizers, matting agents, ultraviolet absorbers, and the like.

Next, the features of the fiber assembly of the present invention will be described with reference to the drawings schematically shown based on actual photographs. FIG. 1 shows an example of a cross-sectional shape of a fiber constituting the fiber assembly of the present invention. FIG. 2 shows a typical model diagram of a typical cross-sectional shape as an example. FIG.
Is a 12 mol% isophthalic acid copolyester containing no TiO ↓ 2 as the component (A),
(B) Polyethylene terephthalate containing 0.45% by weight of TiO ↓ 2 as a component is used and a weight ratio of 30 to 7 is used.
1 shows a cross-sectional structure of a conjugate fiber obtained by spinning using a 24-hole round cross-section nozzle. The composite shape of the component (A) and the component (B) is different between the fibers, and each of the composite fibers having one of the composite shapes (a), (b), and (c) described above is present together. I understand. The cross-sectional shape shown in FIG. 2 (a) is a specific example of the above (a), the cross-sectional shape shown in FIG. 2 (b) is a specific example of the above (b), and the cross-sectional shape shown in FIG. This is a specific example of the above (c).

[0010] In the fiber assembly of the present invention, since these various composite shapes are mixed, some of them produce a large shrinkage strain due to a difference in strain between the component (A) and the component (B). In the case of (a), there is a large latent crimping property, and some of them produce a medium contraction difference in contraction smaller than that of (a),
For example, it has a moderate latent crimp in the case of FIG.
Or, there is almost no difference in shrinkage strain, for example, a layered split type shown in FIG. 2 (c) is obtained. As a whole fiber assembly, a side view is shown in FIG. It becomes a fiber aggregate in which a crimp of a phase difference has been developed. This is a point where the fiber aggregate having the structure has swelling and bulkiness, and gives a soft feeling.

As described above, the composite shapes between the single fibers are different at random, and the shapes are as shown in FIGS.
The mixture represented by the model shape of (c) is a natural spot and texture similar to natural fibers, especially the bulkiness and softness when touched and the overall It became possible to express softness for the first time. A method for obtaining a fiber having such a composite shape will be described in detail later, but by creating a fiber aggregate having the above-described composite shape, a natural natural fiber-like feel that has never been seen before appears. It became possible to make it.

In the composite shape of the above (a),
One of the components (A) and (B) has a fiber cross-sectional area of 5%.
It is essential that the lumps are lumped as large as 0% or more and are unevenly distributed in the cross-section. If no lumps as large as 50% or more are present, a large crimp appears. I can't get it. In the radially bonded structural fiber as shown in FIG. 2 (b), the components (A) and (B) slightly touch each other at the radial center, and as a result, the component (A) or the component (B) May be seen as a continuous large mass through the radial center,
In such a case, it is needless to say that the component (A) or the component (B) is divided at the radial center. The reason that the conjugate fiber of (b) has a higher crimping property than the conjugate fiber of (c) is that, in the case of the conjugate fiber of (b), the center of the radiation usually deviates from the center of the fiber cross section. This is due to shrinkage strain due to the presence in the fiber cross section.

As described above, the fiber aggregate of the present invention is a crimp in which at least a part of the fibers has a phase difference with each other, and usually has a crimp number of 0/40 to 40 / inch. A great feature is that crimped forms are randomly expressed.

In the present invention, the above (a), (b),
Regarding the ratio of the fibers in the composite shape of (c), (b) is 3% or more, particularly 5% or more, and (b) is 10% with respect to the total weight of (a), (b) and (c). As described above, it is preferable that 20% or more, particularly (C) be 10% or more, particularly 20% or more. Of course, the fiber aggregate of the present invention is a composite fiber of the component (A) and the component (B), but has a composite shape that does not belong to the composite shape of the above (a), (b), and (c). May be contained, and fibers other than the composite fibers composed of the components (A) and (B), for example, other synthetic fibers and natural fibers may be added in a large amount.

Next, a production example of the fiber constituting the fiber assembly of the present invention will be described. In order to develop a composite-shaped fiber structure as defined in the present invention, the two-component polymers of polyester (A) and polyester (B) are mixed unevenly under certain conditions during spinning, and different It is important that the heterogeneous mixed polymer stream is distributed in the inclined state, and an example of the spinning method is shown in FIGS.
Spinning may be performed using a composite spinneret as shown in FIGS. The polymer melt streams of the polyester (A) and the polyester (B) respectively extruded by the separate melt extruders are separately weighed by a predetermined amount by a weighing machine, and then filtered by the filtration unit 8 of the sandbox 1, After passing through the filters 6 respectively, they are mixed under predetermined conditions by a static mixer 5 provided on the mixing plate 2 and distributed radially through the distribution path 7 of the distribution plate 3. After the spinning, it is spun from the die plate 10.

Here, it is very important to appropriately select the number of mixing elements of the static mixer 5 so that the two-component polymer is in a non-uniform mixing state. There are several types of static mixers currently in practical use.
In the case where a static mixer of a type that divides 2 層 n layers by passing n elements arranged at 90 ° with blades twisted right and left and right shifted by 90 °, the number of elements is 3 to 12
It is preferable to set it in the range. When the base plate has a one-hole arrangement, the range of 4 to 8 is more preferable. If the number exceeds 12 elements, the mixing property of the polyester (A) and the polyester (B) becomes too good and becomes close to uniform mixing.
It becomes difficult to develop the desired fiber structure.

Another important factor in obtaining the fiber of the present invention is the structure of the distribution plate 3. FIG. 4 is a detailed drawing of the distribution plate viewed from the xx plane, and what is important in this distribution plate is that the heterogeneous mixed flow from which the two-component polymer flows out in a multilayer state via the static mixer is shown. To divide the heterogeneous mixed stream radially by dividing it by the number of radial distribution paths. It is necessary that the number of distribution paths be smaller than the number of nozzle holes. Preferably, the ratio between the number of distribution paths and the number of nozzle holes should be in the range of 1: 1.5 to 1: 5. The example of FIG. 5 is an example in which 12 distribution paths are set for a 24-hole nozzle.

The flow of the non-uniform mixing state of the two-component polymer when it is discharged from the nozzle orifice via the distribution path from the static mixer will be described in more detail by model. As shown in FIG. 6, the polymer stream of the component becomes a layered polymer stream of a total of 16 layers of 8 layers of the A component and 8 layers of the B component. When the polymer stream is passed through a distribution plate having 12 distribution paths as shown in FIG. 5, for example. It is distributed to each distribution path in the state of the polymer stream of (1) to (12),
(1), (12), (6), and (7) blocks have extremely few layers, and (3), (4), (10), and (9) have the largest number of layers. 2), (5), (8), (11)
Reaches the circumferential groove above the nozzle in an intermediate state. Thereafter, the polymer flow from both blocks flows into the nozzle holes existing at the boundary when two or more nozzle holes are arranged in each block, and (1), (12), (6), (7) 2 and (3), (4), (9), and (10), the difference in the mixed state is further expanded, and as a result, FIG.
Fibers in which complex shapes that are complexly different among the single fibers (a), (b), and (c) are mixed can be obtained.

From the (1), (6), (7) and (12) blocks, fibers forming a composite shape similar to (A) or (C) mainly appear, and (3) and (4) , (9), (1
0) From the block, fibers having a composite shape centered on (b) are developed, and (2), (5), (8), (1)
0) From the block, fibers are obtained in which fibers of the composite shape mainly composed of (c) and those of the composite shape similar to (a) or (b) are slightly mixed.

However, since the time-wise flow of the polymer flow constantly flows in the same mixing state, the polymer has substantially the same composite shape in the fiber length direction.

When a static mixer other than Kenix is used, it goes without saying that it is necessary to use a mixer set to a number of elements corresponding to 2 ↑ n layer division or more. Toray high-mixer (Hi-Mixer) and Charles & Ross (Charles & Ross)
Since the number of layer divisions when passing through n elements is 4 ↑ n layer division in a loss ISG mixer manufactured by the company, the number of elements is preferably 2 or more and 6 or less.

Polyester (A) and polyester (B)
Should be in the range of 10:90 to 90:10. If one of the components is less than 10% by weight, the aggregated state of the components having a small ratio becomes small, and even if the composite shape becomes close to the desired composite shape, the fiber will not exhibit much characteristics, which is not preferable. When (A) vs. (B) is in the range of 10:90 to 90:10, it is desirable to comprehensively judge the desired feeling, processability, yarn physical properties, and the like, and to select an optimal mixing ratio.

In order to form a desired composite shape, it is preferable to use a polymer having a melt viscosity within an appropriate range. That is, it is preferable that each of the polyester (A) and the polyester (B) has a melt viscosity at 290 ° C. under zero shear stress of 500 to 7000 poises. It is preferred to choose a combination of polymers that are close within 500 poise.

When the melt viscosity difference between the melt viscosity η ↓ A of the polyester (A) and the melt viscosity η ↓ B of the polyester (B) during the composite spinning is too large, the balance tends to be lost,
Single yarn breakage and breakage due to oblique orientation, screws, etc. during spinning increase, which is not preferable, and at the same time, it is difficult to obtain a desired composite shape. In particular, it is difficult to form a layered divided shape as shown in the model cross-sectional view of FIG. 2 (c), and a polymer having a small ratio is likely to form an island shape, which is not preferable.
If both the components (A) and (B) are less than 500 poise, the spinnability is extremely lowered, which is not preferable. Conversely, (A),
Even if the component (B) has a viscosity of 7000 poise or more, the mixed flow of the component (A) and the component (B) becomes unstable because the pressure loss during spinning becomes too large.

The measurement of the melt viscosity η (poise) under zero shear stress described herein was performed using a Capillograph manufactured by Toyo Seiki Co., Ltd. The shear stress was determined when the shear rate was changed for the polymer in the cell heated to 290 ° C., whereby the apparent melt viscosity was determined. From the relationship between the shear rate and the apparent melt viscosity, the shear stress under zero shear stress was determined. The melt viscosity was extrapolated. There are various methods for extrapolating the melt viscosity under zero shear stress. Here, the reciprocal (1 / η ↓ a) of the apparent melt viscosity (η ↓ a) and the shear rate (γ ↓ w) The relationship is plotted on a graph, and γ ↓
Assuming 1 / η ↓ a value 1 / η at w → 0, η under zero shear stress was calculated. In addition, from the ease of measurement operation, the polymer was used as a measurement sample in the form of pellets, so the melt viscosity at the time of actual spinning at the time of fiberization measured (η) of the fiber after fiberization, The determination was made with reference to the η measurement data of the same [η] polymer pellet.

The fiber aggregate obtained in the present invention may be composed of long fibers or short fibers, and it is needless to say that the same effect can be expected. Further, the fibers constituting the fiber aggregate obtained in the present invention,
By high-order processing such as false twist crimping, it becomes a shape similar to pentagon and hexagon, or three-lobe, T-type, four-lobe, six-leaf, eight-leaf-shaped by nozzle with irregular cross-section during spinning Even if it has a multi-lobed shape or various cross-sectional shapes, it is essential that the fiber structure satisfying the requirements described so far can provide the fiber structure of the present invention that maintains a good feel. A major feature of the fiber aggregate of the present invention is that a fiber obtained by melt extrusion from a deformed nozzle and imparting a crimped form having a phase difference between the fibers to the fiber obtained in the deformed cross-sectional shape while maintaining the deformed shape as it is. It is possible to provide swelling and bulkiness while maintaining the feeling of the deformed cross section.

In order to maximize the characteristics of the fiber assembly of the present invention, it is preferable that the polyester (A) component is fiberized under conditions having sufficient latent shrinkage.
That is, under normal spinning and drawing conditions, the orientation crystallization of both the polyester (A) component and the polyester (B) component proceeds sufficiently, and the phase difference crimp due to the difference in heat shrinkage is not sufficiently exhibited, which is not preferable. In other words, the component (A) is oriented and crystallization is not sufficiently advanced, and the potential large heat shrinkage is maintained, and the component (B) is sufficiently oriented and crystallized to maintain sufficient fiber properties such as strength. It is preferable that the fibers are formed under the conditions described. For this purpose, in the case of filament, the spinning speed is set to 3000 m / min or more and 5500 m / min.
It is preferable to set the copolymerization amount of the isophthalic acid component of the polyester (A) or the alkylene oxide adduct of bisphenol A to a polymer composition having a lower crystallization rate than that of the polyester (B) depending on the conditions within the range. In the case of staples, it is preferable to appropriately change the drawing conditions of the tow spun at a normal speed in a water bath. In other words, it is preferable to set the water bath stretching temperature to 65 ° C. or lower, or to reduce the stretching ratio to about 80% of the normal condition.

The fiber aggregate referred to in the present invention includes multifilament, staple fiber aggregate, tow,
Further, multifilament yarns, spun yarns, and the like manufactured using these materials are included. The main use of the fiber aggregate obtained in the present invention is a dry nonwoven fabric, a wet nonwoven fabric, a woven or knitted fabric, etc. as short fibers. Of course, the aggregate of the present invention is 1
It may be used in a proportion of 00%, or may be partially used to be mixed with other fibers to form a nonwoven fabric or the like, thereby obtaining the effects of the present invention.
However, it goes without saying that it is preferable to mix the fibers of the present invention at a certain ratio or more in order to sufficiently obtain the effects described in the present invention. In addition, the fiber of the present invention has a good feeling even with long fibers, and is most suitable for woven or knitted fabrics and outer garments.

Hereinafter, the present invention will be described with reference to Examples.
It is not limited to this.

EXAMPLES Example 1 The polymer composition was 12 mol% of isophthalic acid, 88 mol% of terephthalic acid, based on all acid components.
Melt viscosity 1500 with copolymerized polyester of 100 mol% ethylene glycol (containing 20.05 wt% of TiO2)
Pois is used as polyester (A), and polyethylene terephthalate (Ti) is used as polyester (B).
O.20.45 wt%) and melt viscosity of 1600 poise, each of which is melt extruded by a separate extruder, and each gear pump is adjusted so that the ratio of (A) to (B) is 30: 70% by weight. And then fed to a spinning pack, and then a layered split polymer stream of component (A) and component (B) is formed in the spinning pack by a device shown in FIG. 4 using a 5-element static mixer manufactured by Kenix. After passing through a distribution plate having 12 divided paths,
It is discharged from the round hole nozzle of the hole at a die temperature of 290 ° C., and the winding speed is 3500 m / min and 5000 m / min.
Then, two types were wound up. The denier after winding is 75
It was a denier 24 filament. Of the two types of wound original yarns, a yarn wound at 3500 m / min is a core yarn, and a yarn wound at 5000 m / min is interlaced with an overfeed difference so as to be a side yarn. The yarn was wound to obtain a multifilament of 150 denier and 48 filaments. The fiberization processability was good and there was no problem.

The resulting multifilament was used as a warp and a weft to produce a 1/1 plain weave. The weaving process could be performed without any problem. After treating the greige plain fabric by a usual method, it was dyed by the following method, and then dried and finished and set by a conventional method. Dyeing method Dye; Dianix Red BN-SE (CI Disperse Red 127) 2% owf Dispersing aid; Disper TL (manufactured by Meisei Chemical Industry) 1 g / l ph adjuster; ammonium sulfate 1 g / l acetic acid (48%) 1 cc / l bath Ratio: 1:30 Temperature: 130 ° C × 60 minutes Reduction washing Hydrosulfite 1 g / l Amyrazine (Daiichi Kogyo Seiyaku) 1 g / l NaOH 1 g / l Bath ratio: 1:30 Temperature: 80 ° C × 20 minutes As the plain woven fabric, a woven fabric having a good feeling similar to a natural wool fiber having a soft feeling and a bulky feeling and a rebound was obtained. When the fibers constituting the woven fabric were observed with a microscope and a scanning electron microscope, it was found that a crimped form having a phase difference between the single fibers was randomly expressed in the fiber length direction. I understood. Further, it was confirmed that the polyester (A) component formed a high shrinkage component.

[Examples 2 to 8] Under the conditions shown in Table 1, fiberization was carried out in the same manner as in Example 1, and a plain woven fabric was produced in the same manner as in Example 1. In each case, woven fabrics having good processability and good hand were obtained. In Examples 2 and 3, the weight composite ratio of the polyester (A) and the polyester (B) was changed to 50:50 and 70:30, respectively. In Examples 4 and 5, the isophthalic acid copolymerization of the polyester (A) was changed to 8 mol% and 18 mol%, respectively, and the melt viscosities were 1550 poise and 1400 poise, respectively. In the sixth embodiment, a modified nozzle is used as the nozzle so that the cross-sectional shape becomes a trilobe cross section. In Examples 7 and 8, the number of static mixer elements in the spinning pack was set to 8 and 4, respectively.

Example 9 The copolymer composition was 12 mol% of isophthalic acid, 88 mol% of terephthalic acid, and 100 mol% of ethylene glycol based on the total acid components. Is 1
Using 500 poise as polyester (A),
Polyester terephthalate (containing TiO ↓ 20.45 wt%) as polyester (B) having a melt viscosity of 160
Melt extruded each with a separate extruder using a 0 poise, weighed each with a gear pump so that the ratio of (A) to (B) would be 30 to 70% by weight, and then supplied to a spinning pack. Using a device shown in FIG. 4, a layered split polymer stream of the component (A) and the component (B) is formed in a spin pack using a 5-element static mixer manufactured by Kenix, and passed through a distribution plate having 12 split paths. After 24
The mixture was discharged from the round hole nozzle of the hole at a die temperature of 290 ° C. and melt-spun at a winding speed of 1000 m / min. The obtained spun yarn is stretched 3.0 times in a water bath at 65 ° C.
After applying 5% shrinkage in a water bath at ℃, mechanical crimping is applied.
Then, a general glue was applied so as to be 0.1 wt%, air-dried, and then cut into a length of 51 mm to obtain a single denier 2 raw cotton. Thereafter, 20% cotton of 2 denier × 51 mm was mixed with 20% of a binder fiber of Sofit N-710 type manufactured by Kuraray Co., Ltd. (heat-fused fiber of polyethylene sheath component and polyethylene terephthalate core component).
A web with a basis weight of 30 g / m @ 2 was prepared and then
A non-woven fabric was prepared by performing a hot-air treatment at ℃. The processability from spinning to preparation of the final nonwoven fabric was good and no problem. The hand of the nonwoven fabric was good with natural softness, swelling and touch.

Example 10 A fiber was prepared in the same manner as in Example 1 except that polyethylene terephthalate having a melt viscosity of 1800 poise and 2.5 mol% of 5-sodium sulfoisophthalic acid copolymerized as polyester (B) was used. The plain fabric was prepared in the same manner as in Example 1. In each case, woven fabrics having good processability and good hand were obtained.

Comparative Example 1 As the polyester (A), a polymer having a copolymer composition of 2 mol% of isophthalic acid, 2 mol% of isophthalic acid, 98 mol% of terephthalic acid, 100 mol% of ethylene glycol and a melt viscosity of 1650 poise were used. Except for the above, fiberization is performed in the same manner as in Example 1,
A plain fabric was prepared in the same manner. The processability was good, but the feeling was insufficient with no features.

Comparative Example 2 As polyester (A),
Polymer composition copolymerized with 25 mol% of isophthalic acid 25 mol% of isophthalic acid, 75 mol% of terephthalic acid, 100 mol% of ethylene glycol Except for using a polyester having a melt viscosity of 1300 poise, the same method as in Example 1 was employed to produce a fiber. A plain weave was made by the method. The spinnability was slightly poor and many single yarn breaks occurred. In the obtained woven fabric, a softening and sticking phenomenon occurred during the process in which the polyester A component passed through the temperature history in the processing step, and the hand was hard and not preferable.

Comparative Examples 3 and 4 The same polymer as in Example 1 was used. In Comparative Example 1, the composite ratio of (A) / (B) was 5 /
In Comparative Example 2, the composite ratio of (A) / (B) was set to 95.
Other than that, the test was carried out under the same conditions as in Example 1. However, in all cases, there was a large amount of obliqueness and screw drop during nozzle discharge during spinning, and the spinnability was poor. The composite shape of the obtained fiber was close to a sea-island structure, and was an ordinary composite shape. In addition, the obtained woven fabric had no characteristic.

Comparative Example 5 A woven fabric was prepared in the same manner as in Example 1 except that the same polymer as in Example 1 was used, and a composite spinning of a side-by-side bonded structure was performed at a composite ratio of 50 to 50. . Since the single fibers formed a coiled cling which did not have a phase difference, the feeling was swelling and the softness was inferior to that of Example 1.

Comparative Example 6 The same polymer as in Example 1 was used, and the ratio of the A polymer to the B polymer was 50:50.
Polyester A was used as the sheath component and polyethylene terephthalate was used as the core component. Others were made into fibers under the same conditions as in Example 1 to produce a woven fabric, but the hand had no characteristic. Tables 1 to 3 show the results of all the above Examples and all Comparative Examples.

[0039]

[Table 1]

[Table 2]

[Table 3]

[Example 11] Polyethylene terephthalate obtained by copolymerizing a diol compound obtained by adding about 1 mol of ethylene oxide to both terminal hydroxyl groups of bisphenol A with respect to all diol components as polyester (A) was 8 mol%. (Melt viscosity: 1600 poise, Ti
The same procedure as in Example 1 was carried out except that O.sub.2 was used (0.05% by weight) to obtain a multifilament yarn of 150 denier and 48 filaments. The ratio (a) :( b) :( c) of the composite shape in the cross section of this multifilament yarn was 12:46:42, and the multifilament yarn had a crimp with a sufficient phase difference. And this multi-filament yarn
It had natural swelling, bulkiness and softness similar to natural fibers.

Example 12 As the polyester (A), a diol compound obtained by adding 3.5 mole% of isophthalic acid to the total acid component and adding about 1 mole of ethylene oxide to both terminal hydroxyl groups of bisphenol A (Polyethylene terephthalate) obtained by copolymerizing the diol component with the diol component in an amount of 3.5 mol (melt viscosity: 1500 poise, Ti
The same procedure as in Example 1 was carried out except that O.sub.2 was used (0.05% by weight) to obtain a multifilament yarn of 150 denier and 48 filaments. The ratio of (a) :( b) :( c) of the composite shape in the cross section of this multifilament yarn was 12:46:42, and had a crimp with a sufficient phase difference. This multifilament yarn also had a natural swelling, bulkiness and soft feel similar to that of the natural fiber, as in the case of Example 11.

[0042]

[Brief description of the drawings]

FIG. 1 is a diagram showing an example of a cross-sectional shape of a fiber constituting a fiber assembly of the present invention.

FIG. 2 is a view showing a specific example of a cross-sectional shape of three kinds of fibers constituting a fiber assembly of the present invention.

FIG. 3 is a side view of an example of the fiber aggregate of the present invention.

FIG. 4 is a longitudinal sectional view of a spinning device capable of obtaining a fiber aggregate of the present invention.

FIG. 5 is a cross-sectional view taken along the line XX ′ in the spinning apparatus of FIG. 4;

FIG. 6 is a cross-sectional view schematically showing one example of a composite flow in the process of producing the fiber aggregate of the present invention.

Continuation of the front page (56) References JP-A-2-221415 (JP, A) JP-A-57-193522 (JP, A) JP-A-59-100744 (JP, A) JP-A-59-26524 (JP, A) , A) (58) Field surveyed (Int.Cl. ⁷ , DB name) D01F 8/14 D01F 6/62

Claims (3)

(57) [Claims] (1) Isophthalic acid is contained in an amount of 4 to 2 with respect to the total acid component.
An aggregate of a composite fiber comprising a polyethylene terephthalate-based polyester (A) copolymerized with 0 mol% and substantially polyethylene terephthalate (B), wherein the component (A) and the component (B) constituting the composite fiber are Weight ratio is 1
In the range of 0:90 to 90:10, the composite cross-sectional shape of the component (A) and the component (B) constituting the composite fiber is substantially the same in the longitudinal direction of the fiber, and A fiber aggregate having excellent phase difference crimps, characterized in that each of the composite fibers as shown in (a), (b) and (c) is contained in the fiber aggregate. (A) A composite fiber in which one of the component (A) and the component (B) is a large lump occupying 50% or more of the fiber cross-sectional area and is unevenly distributed in the cross section; Neither component (B) nor component (B) exists in the cross section as a large lump occupying 50% or more of the cross-sectional area of the fiber, and component (A) and component (B) cross the fiber at the center of radiation. Composite fiber with a radially bonded structure placed on the surface,
(C) Neither the component (A) nor the component (B) is present in the cross section as a large lump occupying 50% or more of the fiber cross-sectional area, and the component (A) and the component (B) Composite fiber that has a laminated structure with components, but does not have a radial laminated structure that places the center of radiation in the fiber cross section, 2. An assembly of a composite fiber comprising a polyethylene terephthalate-based polyester (A) in which an alkylene oxide adduct of bisphenol A is copolymerized in an amount of 4 to 20 mol% with respect to all diol components, and substantially polyethylene terephthalate (B). A weight ratio of the component (A) to the component (B) constituting the composite fiber is 10:90 to 9:
(A) in the range of 0:10, and constituting the composite fiber
The composite shape of the fiber cross section of the component and the component (B) is substantially the same in the length direction of the fiber, and the following (A) and (B)
And a fiber assembly having excellent phase difference crimp, wherein each of the composite fibers as shown in (c) is contained in the fiber assembly. (A) A composite fiber in which one of the component (A) and the component (B) is a large lump occupying 50% or more of the fiber cross-sectional area and is unevenly distributed in the cross section; Neither component (B) nor component (B) exists in the cross section as a large lump occupying 50% or more of the cross-sectional area of the fiber, and component (A) and component (B) cross the fiber at the center of radiation. Composite fiber with a radially bonded structure placed on the surface,
(C) Neither the component (A) nor the component (B) is present in the cross section as a large lump occupying 50% or more of the fiber cross-sectional area, and the component (A) and the component (B) Composite fiber that has a laminated structure with components, but does not have a radial laminated structure that places the center of radiation in the fiber cross section, 3. A polyethylene terephthalate-based polyester (A) in which isophthalic acid is copolymerized in a mole% with respect to the total acid component, and an alkylene oxide adduct of bisphenol A is copolymerized in a mole ratio of b mol% with respect to the total diol component. A composite fiber comprising polyethylene terephthalate (B), wherein the sum of a and b is 4 to 20, and the weight ratio of component (A) to component (B) constituting said composite fiber is In the range of 10:90 to 90:10, the composite cross-sectional shape of the component (A) and the component (B) constituting the composite fiber is substantially the same in the length direction of the fiber, and A fiber aggregate having excellent phase difference crimps, characterized in that each of the composite fibers as shown in (a), (b) and (c) is contained in the fiber aggregate. (A) A composite fiber in which one of the component (A) and the component (B) is a large lump occupying 50% or more of the fiber cross-sectional area and is unevenly distributed in the cross section; Neither component (B) nor component (B) exists in the cross section as a large lump occupying 50% or more of the cross-sectional area of the fiber, and component (A) and component (B) cross the fiber at the center of radiation. Composite fiber with a radially bonded structure placed on the surface,
(C) Neither the component (A) nor the component (B) is present in the cross section as a large lump occupying 50% or more of the fiber cross-sectional area, and the component (A) and the component (B) Composite fiber that has a laminated structure with components, but does not have a radial laminated structure that places the center of radiation in the fiber cross section,