JP3257114B2 - Polyester hollow fiber with high coloring properties - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hollow polyester fiber having high coloring properties. More specifically, as a material for apparel, especially a material for sports apparel, it has a higher color development than before, it is lightweight, has excellent heat retention, and has a dry cool feeling,
The present invention relates to a high-quality polyester hollow fiber which has good clarity and high strength, and whose fiber cross section is hard to be crushed.

[0002]

2. Description of the Related Art Polyester fibers are widely used for general clothing because of their excellent properties such as mechanical properties, chemical properties, easy care properties and glossiness. In particular, recently, it has attracted attention as a material for sports clothing, and has been used in all sports fields. In recent sports clothing, diversification and individualization of needs have demanded high coloring and sharpness, and some technologies have been developed and products are being sold. Basic dyeable polyesters are well known as polymers having excellent coloring properties. Conventionally, as a basic dye dyeable polyester, a polyester obtained by copolymerizing an isophthalic acid component having a metal sulfonate group, for example, a 5-sodium sulfoisophthalic acid component is known from Japanese Patent Publication No. 34-10497. However, in this case, an isophthalic acid component having a metal sulfonate group (hereinafter abbreviated as S component) is required to raise the color development to a satisfactory level.
Must be copolymerized in large amounts. A polymer obtained by copolymerizing a large amount of the S component has a high melt viscosity in a polymer having a degree of polymerization required as a fiber due to a thickening effect of the S component,
Spinning was difficult. Therefore, in order to spin a polymer obtained by copolymerizing a large amount of the S component by an ordinary method, it is necessary to lower the degree of polymerization of the polymer in order to reduce the melt viscosity to a range where ordinary spinning is possible. However, as a result, there were drawbacks that the yarn strength was reduced, that the yarn formability and the passability of the higher order process were reduced, and that the use was limited. In addition, copolymerization of a large amount of the S component also causes a decrease in the alkali resistance of the yarn and a decrease in the light resistance of the dyed product, which limits the use of the obtained yarn. In particular, a material for sports clothing is required to have a higher thread strength and a higher light resistance of the product as compared with general clothing.

[0003] In addition, there has been a demand for lighter clothing as one of the needs in the past, and in particular, there has been a strong demand for lighter weight in sports clothing in terms of ease of exercise, and in winter clothing, it has been required to maintain heat retention. Is desired. As a measure to reduce the weight of clothing, it is possible to some extent by increasing the bulkiness of the yarn or devising the structure of the woven or knitted fabric, but to further reduce the weight, it is necessary to reduce the weight of the fiber itself There is. As one of the means, an apparently lightweight hollow fiber is used. Hollow fibers have been known for a long time. For example, Japanese Patent Publication No.
Methods for producing 0% or less hollow fibers are disclosed, and many other patent publications disclose hollow fibers and methods for producing hollow fibers.

Japanese Patent Application Laid-Open No. Sho 59-211659 discloses a technique of a hollow fiber made of a polymer obtained by copolymerizing an S component. However, the hollow fiber of this technique is presumed to have a low yarn strength and a low thread-forming property and a low passability in a high-order process for the above-mentioned reason, and as described in the publication, is made into a staple fiber and blended with other fibers. The use is limited, for example, when used. Japanese Patent Application Laid-Open No. 4-289219 discloses a technique of hollow fibers made of a cationic dye-dyed polyester. However, hollow fibers based on this technique have a special copolymer component and a special non-reactive component in the polyester. By the addition, the specified yarn properties are satisfied.

[0005] As described above, there are several known hollow fiber techniques and techniques for using a special polymer for the hollow fiber, but they have high coloring properties, are lightweight, are excellent in heat retention, and have high strength. As a matter of fact, high-quality polyester hollow fibers whose cross section is not easily crushed have not been obtained.

[0006]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a high-quality polyester hollow fiber having high color development, light weight, excellent heat retention, high strength, and a fiber cross section that is unlikely to be crushed as described above. Is to do.

[0007]

SUMMARY OF THE INVENTION An object of the present invention is to provide an isophthalic acid component having a metal sulfonate group of 0.7 to 2.4 mol% based on the total dicarboxylic acid component and a polystyrene having a molecular weight of 90 to 6000. An alkylene glycol component is formed of a modified polyester having an intrinsic viscosity (IV) of 0.64 or more obtained by copolymerizing the alkylene glycol component with the polyester in an amount of 0.2 to 10% by weight. have a hollow portion of the triangular in the center of the fiber cross section,
The hollow ratio of the middle hollow portion can be achieved by a polyester hollow fibers having a high coloring property, characterized in that 15 to 50%.

Hereinafter, the present invention will be described in detail. The polyester hollow fiber of the present invention has an isophthalic acid component containing a metal sulfonate group of 0.7 to the total dicarboxylic acid component.
Intrinsic viscosity (I) obtained by copolymerizing a polyester with a polyalkylene glycol component having a molecular weight of 90 to 6000 (hereinafter abbreviated as a G component) in an amount of 0.2 to 10% by weight based on polyester.
V) must be formed of a modified polyester of 0.64 or more.

The modified polyester has a higher yarn strength than that obtained by simply copolymerizing a large amount of the S component to improve the dyeability.
It shows good coloring and light fastness to basic dyes.

The S component is a compound represented by the following formula, specifically, dimethyl (5-sodium sulfo) isophthalate, bis-2-hydroxyethyl (5-sodium sulfo) isophthalate, bis-4- Hydroxybutyl (5-sodium sulfo) isophthalate; dimethyl (5-lithium sulfo) isophthalate;

[0011]

Embedded image (Where M represents an alkali metal such as Na, Li, and K, and A and A ′ represent hydrogen, an alkyl group, or — (CH ₂ )
_n represents OH, and n represents an integer of 2 or more.) Preferred S components include dimethyl (5-sodium sulfo) isophthalate and bis-2-hydroxyethyl (5-sodium sulfo) isophthalate. It is necessary that the S component is copolymerized with the modified polyester acid component at 0.7 to 2.4 mol%. If the copolymerization amount is less than 0.7 mol%, the dyeability and coloring of the fiber with a basic dye are unsatisfactory,
If it exceeds 2.4 mol%, the melt viscosity becomes extremely large, so that during melt spinning, appropriate filtration cannot be performed, and an undrawn yarn having good yarn characteristics cannot be obtained. As a result, the yarn strength also decreases.

The G component has a molecular weight of 90 to 6000.
Need to be G having a molecular weight of less than 90
In the copolymerization amount to satisfy light resistance in components, dyeability and color development of the fibers becomes insufficient, also due to the melting point of the modified polyester becomes low due to a molecular weight is small, higher fiber Workability becomes poor.

Meanwhile, since the molecular weight is unlikely to uniformly copolymerized in reforming the polyester is a G component exceeds 6000, the copolymerization amount to satisfy the dyeability and color developability of the resulting fibers
In this case, the light resistance is unsatisfactory. In addition, drawbacks such as a decrease in the resistance to oxidative degradation of the modified polyester and a decrease in the anti-frosting property of the resulting fabric occur.
Preferred molecular weight of the G component is 100 to 4000,
More preferably, it is 100 to 1200.

A typical example of the G component having a molecular weight of 90 to 6000 is HO- (CH ₂ —CH ₂ —O) _m R.
—O— (CH ₂ —CH ₂ —O) _n H (where R is a divalent aliphatic hydrocarbon group having a straight-chain, cyclic or side chain having 3 to 20 carbon atoms, a phenylene group, a biphenylene group, A divalent aromatic hydrocarbon group such as a naphthalene group, m and n are the same or different integers and 1 ≦ m + n ≦ 100), a glycol represented by the following formula, a bisphenol A-ethylene oxide adduct, and a polyalkylene represented by the following formula: Glycol and the like. _{A (C n H 2 n O} ) m H ( wherein A is _C e H _{2e + 1} O or OH, e is 1 to 1
0 and n represent an integer of 2 to 5 and m represents an integer of 2 to 65. )

The G component is preferably a polyalkylene glycol. This is more advantageous than other G components for obtaining a modified polyester having a degree of polymerization necessary for obtaining a fiber having good yarn properties, because the polyalkylene glycol has a greater viscosity reducing effect than other G components. It depends. And as a polyalkylene glycol, OH
Polyethylene glycol having a group is more preferred. This is because the shorter the alkylene oxide unit and the more the glycol is copolymerized at random, the greater the effect of improving color development and the effect of reducing viscosity.

The copolymerization amount of the G component must be in the range of 0.2 to 10% by weight based on the modified polyester. If the copolymerization amount of the G component is less than 0.2% by weight, the coloring property of the modified polyester fiber is unsatisfactory, and if it exceeds 10% by weight, the light resistance and the oxidative decomposition resistance of the dyed cloth are reduced.

In the present invention, the modified polyester fiber must have an intrinsic viscosity of 0.64 or more. When the intrinsic viscosity is less than 0.64, there are drawbacks that the yarn strength is not at a satisfactory level and that the hollow ratio of the hollow fiber is difficult to increase. However, if the intrinsic viscosity is too high, the melt viscosity during melt spinning becomes too high and spinning becomes difficult. Therefore, the intrinsic viscosity is preferably 0.88 or less.

The modified polyester of the present invention contains well-known additives such as a matting agent, an antioxidant, a fluorescent brightener, a flame retardant, and an ultraviolet absorber as long as the effects of the present invention are not impaired. It may be.

The polyester hollow fiber of the present invention must have a triangular or circular cross section. If the outer shape of the cross section of the fiber is extremely irregular, yarn breakage is likely to occur during spinning, and yarn breakage or fluff is likely to occur during stretching. Note that a triangle means a so-called “diaper shape” in which the corners of the triangle as shown in FIG. 4 are rounded, and means that the sides of the triangle are not depressed inward. In addition, the circular shape does not necessarily have to be a perfect circle, but may be a substantially perfect circle shape.
Specifically, a circle or an ellipse having a diameter difference of 10% or less between the long diameter and the short diameter, or the distance R1 to the point on the outer circumference farthest from the center of gravity of the yarn and the outer circumference closest to the center of gravity of the yarn. In the present invention, the relationship of the distance R2 to the point is [(R1 -R2
) / R1] × 100 ≦ 10. In the present invention, the shape between the above-described triangle and the circle is also included.

Further, the hollow polyester fiber of the present invention needs to have a triangular hollow portion substantially at the center of the fiber cross section. That is, it means that the hollow portion does not exist eccentrically. Having a hollow part reduces the weight by that much,
The weight of the woven or knitted fabric can be reduced.

Further, even if the modified polyester used in the present invention is converted into a fiber having a normal circular cross section or an irregular cross section, the above-mentioned good characteristics, namely, yarn strength, yarn-making properties, high process passability, color development, and color fastness, can be obtained. Although it can improve alkalinity and light resistance, it can improve sharpness and gloss by using special hollow fibers.

It is not clear why the sharpness and gloss can be improved. However, when light hits the hollow fiber, the light enters the hollow portion and is transmitted, and the light is reflected again by the inner wall of the triangular hollow portion to increase the gloss. It seems that it is increasing. Furthermore, since the hollow portion is located at the center of the fiber and the hollow portion has a triangular shape, the hollow portion is less crushed during stretching and in the high-order processing step, that is, the hollow ratio is reduced. In general, in the production of a hollow fiber and its high-order processing steps, the hollow fiber is subjected to a threading pressure with rollers, a frictional force at guides, or other external force.
Pressure is applied to the fiber from the side direction, and the fiber cross section is crushed into an elliptical shape or a flat shape, and the hollow ratio decreases. This phenomenon is more likely to occur in hollow fibers having a higher hollow ratio. In addition, when the hollow ratio exceeds a certain value, it tends to occur when the outer shape and hollow portion of the fiber are circular. Further, when the hollow portion is not eccentric but at the center of the fiber, that is, when the hollow portion is partially thin, it tends to occur. On the other hand, the polyester hollow fiber of the present invention has a triangular hollow portion at the center of the fiber cross section as described above, so that it is not easily crushed.

The triangular shape of the hollow portion of the hollow fiber of the present invention will be described with reference to FIG. The three vertices of the triangle are a, b, and c, respectively, and the three sides of the triangle connecting the three points by straight lines are ab, bc, and ca. A perpendicular line cd is drawn from the point c to the side ab, and an intersection of the perpendicular line cd and the hollow wall is defined as e. From the points a and b, perpendiculars are drawn to the sides bc and ca, respectively, and points f, g, h, and i are determined as shown in the figure. The hollow portion of the hollow fiber of the present invention has a triangular shape as a whole and is preferably an equilateral triangle, but may have a tapered shape as shown in FIG. (1) The lengths of the side line segments ab, bc, and ca are preferably equal, but may vary by 20% or less.

(2) Each value of line segment ag / line segment af, line segment bi / line segment bh, and line segment ce / line segment cd is 1.0 to 1.0.
The range of 1.3 is preferred, and more preferably 1.0 to 1.
2 range.

The area occupied by the hollow portion in the cross section of the hollow fiber of the present invention, that is, the hollow ratio must be in the range of 15 to 50%. When the hollow ratio is less than 15%, the effect of reducing the weight of the garment is small, and the effect of heat retention is also small. As mentioned earlier, the heat retention of the woven or knitted fabric can be increased to some extent if the structure is made to contain air between fibers or tissues, but if the structure is made to contain air too much, the air warmed at body temperature will be heated. Convection occurs and the heat retention decreases. In the hollow fiber, since air is sealed in the yarn itself, there is no convection and the heat retention can be improved. The higher the hollow ratio, the greater the effect of reducing the weight and the effect of heat retention, but it is preferable.However, with a fiber with an excessively high hollow ratio, the fiber cross section is likely to be crushed in the high-order processing step, and when the fabric becomes clothing, The hollow ratio cannot be maintained, and the fiber cross section is liable to be crushed during the wearing of the clothing. Therefore, the hollow ratio needs to be 50% or less. More preferably, the content is 20 to 40% from the viewpoint of the effect of weight reduction, the effect of heat retention, the ease of crushing of the fiber cross section during wearing, and the like.

Further, it is preferable that the thinnest portion of the hollow fiber in the cross section of the hollow fiber of the present invention has a thickness satisfying the following expression. Thickness (micron) ≧ 2.1 × d ^0.5 (denier) For example, in the case of 3 denier fiber, the thickness should be 3.6 microns or more .
is there. The thickness of the portion which is not the middle empty section, fineness of the hollow fiber is determined by the shape of the hollow rate and the hollow portion, it is possible to prevent the collapse of the fiber cross-section by the wall thickness in any event satisfies the above formula .

In the fiber of the present invention, the presence or absence of fluff in the original yarn stage, that is, the presence or absence of the fluff of the yarn wound by spinning or drawing, is greatly related to the quality of high-order workability. Large compared to. Therefore, fluff number of yarns wound is preferably not more than 0.20 particles / 10 ⁴ m, more preferably at most 0.10 pieces / 10 ⁴ m, 0.05 pieces / 10 ^More preferably, it is ⁴ m or less.

The polyester hollow fiber of the present invention is obtained by melt-spinning the modified polyester of the present invention from, for example, a die having a three-slit type polymer discharge hole shown in FIG. 2 and applying an oil agent to obtain an undrawn yarn. It can be obtained after winding once or by subsequent stretching. On this occasion,
The forced cooling of the melt spun yarn is 3 to 15 cm below the spinneret surface.
It is preferable to start the blowing of the cooling air at the above distance because the variation of the hollow ratio can be reduced. For further stretching, using a hot roll-hot roll type stretching machine,
A method of preheating to 75 to 100 ° C. with the first hot roll and stretching with the second hot roll is preferred to reduce the generation of fluff. The temperature of the second hot roll may be appropriately set so as to match the target shrinkage characteristics of the yarn to be obtained. The cross section of the resulting fiber is almost equivalent to that shown in FIG.

The polyester hollow fiber of the present invention can be used not only as a material for clothing, but also as a material for construction of industrial materials such as car seats. Among the materials for clothing, it is particularly effective as a material for sports clothing.

As described above, the S component and the G component are copolymerized to form a specified hollow fiber made of a modified polyester having an intrinsic viscosity of a certain level or more, and thus a high hollow fiber which is not available in the conventional hollow fiber can be obtained. A fiber having coloring properties, a dry refreshing sensation, good clarity, high strength, and a fiber whose fiber cross section is hard to be crushed can be achieved, and a high-quality fiber lightweight and excellent in heat retention can be provided. Therefore, the polyester hollow fiber in the present invention can be effectively used not only as a material for clothing but also as a material for industrial construction.

[0031]

The present invention will be described in more detail with reference to the following examples. The physical properties in the examples were measured as follows.

A. Glycol component in polymer After decomposing the polymer with amine, quantitative analysis was performed using gas chromatography or liquid chromatography.

B. Gloss After adjusting the reference value using a standard gloss plate of magnesium oxide under the conditions of irradiation 45 degrees and light reception 44 degrees using an automatic colorimeter made by Suga Test Machine, the sample was wound on an aluminum plate and moved in the fiber axis direction. Irradiation and light reception were performed, and the glossiness was measured.

C. The hollowness ratio was calculated from the cross-sectional photograph of the fiber according to the following equation. Hollow ratio (%) = (cross-sectional area of hollow part / cross-sectional area of fiber) × 1
00

D. Fluff Using a multi-fly counter F type of Toray Engineering Co., Ltd., 5 × 10 ⁴ m was measured while running five drawn yarns at about 400 m / min, and the fluff number was determined from the total number counted. Number of fluff (pieces / 10 ⁴ m) = (total count / 25 × 10
⁴ m) × 10 ⁴

E. Intrinsic viscosity 0.8 g of the modified polyester was dissolved in 10 cc of orthochlorophenol, and the solution was measured using an Ostwald viscometer.
It was determined by measuring at 5 ° C.

F. Light fastness The light fastness was measured using a fade meter in accordance with JIS-L1044 and based on a blue scale when photobleaching was performed.

G. Stainability Malachite green (Kanto Chemical Co., Ltd.) 5% owf,
Acetic acid 0.5 g / l, sodium acetate 0.2 g / l, bath ratio 1:
The dye exhaustion rate was determined by dyeing under conditions of 100 and a temperature of 120 ° C. in a solvent water.

H. Coloring properties Dyeing is performed by the above method so that the dye exhaustion rate of the cloth becomes the same, and five or more cloths are superimposed using an SM color computer (manufactured by Suga Test Instruments Co., Ltd.), and the irradiation light is not transmitted. The L value was measured. Example 1 Terephthalic acid (98.3 mol%) as an acid component as a polymer
And dimethyl-5-sodium sulfoisophthalic acid (1.
7 mol%), and a polyester (intrinsic viscosity adjusted to 0.68 to 0.70) using ethylene glycol and the glycol shown in Table 1 as the glycol component was used. After discharging from a mouthpiece having 24 holes, cooling air is blown at a speed of 25 m / min at a position 8 cm below the mouth face of the mouthpiece to cool the oil so that the oil content is 1.0%. After applying while controlling, it was wound up at a spinning speed of 1650 m / min.

The obtained undrawn yarn is pre-heated by a hot roll-hot roll type drawing machine with the first hot roll at 90 ° C., and the drawn yarn elongation with the second hot roll is 3%.
The film is heat-treated at a second hot roll temperature of 143 ° C. while being stretched at a stretching ratio of 5 ± 2%, and a winding speed of 800 m / min.
To obtain a hollow fiber yarn of 75 denier and 24 filaments. The obtained yarn was knitted in a circular knitted fabric. The cross section of the obtained fiber was the same as in FIG. 1, and the hollow portion was triangular and located at the center of the fiber . The thickness of the non-hollow portion was 4.6 microns at the thinnest portion. The number of fluffs of the obtained fiber yarn was determined in Experiment N where no polyalkylene glycol was added.
o. Although a large number occurred in Experiment No. 8, Except for 8, the number was 0.10 pieces / 10 ⁴ m or less. The hollow ratio of each of the obtained fibers was in the range of 27 to 29%. Table 1 shows the strength, color development on a circular knitted fabric, dyeability, and light resistance of the obtained fiber.

[0041]

[Table 1] Experiment No. of the present invention. Nos. 1 to 7 have high yarn strength, excellent dyeing properties, coloring properties, and light fastness, and have a dry refreshing feeling as a result of a sensory evaluation of the knitted fabric, and also have good clearness,
Furthermore, it had a unique luster.

Experiment No. No. 8 (Comparative Example) had remarkably low yarn strength, had a large number of fluffs of 30/10 ⁴ m, and had insufficient coloring and light fastness. Experiment No. 9 (comparative example)
Has a low staining property, and Sample No. 10 (Comparative Example) was poor in light fastness, had many yarn breaks during stretching, and had uneven dyeing of the dyed knitted fabric.

Example 2 Experiment No. 1 of Example 1 6, a hollow fiber yarn having a changed hollow ratio was obtained in the same manner as in Example 1 except that a die having an inner diameter of a slit arranged in a ring shape in a die discharge hole of FIG. 2 was used. . The obtained yarn has a fuzz count of 0.1.
And a 0/10 ⁴ m or less, strength ranged from 286～295G.

The thickness of the thinnest portion of the non-hollow portion is in the range of 3.4 to 6.0 microns. No. 14 was 3.7 microns, and the results of Experiment No. 14 were 3.7 microns. 15 was the thinnest at 3.4 microns. The obtained hollow fiber yarn was evaluated according to Example 1. The light fastness was all 4.0 grade. Other evaluation results are shown in Table 2.

[0045]

[Table 2] Experiment No. No. 11 (Comparative Example) has a small hollow ratio and a small lightness effect. In addition, the coloring property was slightly small . Hollow ratio is 5
Experiment No. exceeding 0% In No. 15, the fiber was frequently crushed and the degree of crushing was large, and the fiber was frequently crushed during knitting, and the hollow ratio in the knitted fabric was small. Experiment N of the present invention in terms of lightness and preservation of fiber cross-section shape in post-processing
o. 12, 13, and 14 fibers can be effectively used.

Example 3 Experiment No. 1 of Example 1 A hollow fiber yarn was obtained according to Example 1 and evaluated according to Example 1, except that a polyester having a polymer composition of No. 6 and various intrinsic viscosities IV were used, and a spinning temperature at which melt spinning was normal was employed. . Intrinsic viscosity IV
Experiment No. No. 16 has a low yarn strength and is not a satisfactory level. In addition, yarn breakage during spinning was as large as 5 times / ton, and the fluff of the yarn was as large as 3.4 threads / 10 ⁴ m.

Experiment No. Nos. 17 to 20 had no problem in both hollow ratio and strength. However, in Experiment No. Since No. 20 has a high melt viscosity at the time of spinning, spinning for a long time is difficult, which is not preferable in production. In addition, other characteristics such as coloring property, dyeing property and light fastness were all satisfactory. Table 3 shows the results.

[0048]

[Table 3] Example 4 Experiment No. 1 of Example 1 was performed. 6a and 6 using the polymer of FIG.
A hollow fiber yarn having a modified fiber cross section was obtained and evaluated in the same manner as in Example 1 except that a die having a die discharge hole b was used. The cross section of the obtained fiber is shown in FIGS. 5a and 5b. The experimental results are shown in Experiment No. Table 4 shows a comparison with No. 6.

[0049]

[Table 4] Shows contour is not circular, triangular invention in FIG. 5a (three
The leaf-shaped hollow fiber yarn (Experiment No. 21 (Comparative Example), hollow ratio 17.2%) has a large number of yarn breaks of 16 times / ton during spinning, and also generates 3.8 fuzz during drawing. Co / 10 ⁴ m, and the yarn breakage rate was as high as 13%.

The hollow fiber yarn in which the hollow portion is eccentric as shown in FIG. 5B has a hollow ratio of 27.5 (Experiment No. 22 (Comparative Example)).
%, But when the fabric was knitted, the change in cross section was large and the fibers were crushed, and the hollow ratio was reduced to 19.2%.

Example 5 Experiment No. 1 of Example 1 2 and 6c using the polymer of FIG.
A hollow fiber yarn having a hollow fiber shape comparison was obtained and evaluated in the same manner as in Example 1 except that the hollow ratio was adjusted to about 36% by using a die having a die discharge hole. The cross section of the obtained fiber is almost equivalent to the shape shown in FIGS. 1 and 5c. The experimental results are shown in Table 5.

[0052]

[Table 5] The hollow fiber yarn having a substantially perfect hollow shape shown in FIG. 5C (Experiment No. 24 (Comparative Example)) had a hollow ratio of 36.5%, but the cross-sectional change was large when knitted. The fiber collapsed and the hollow ratio was reduced to 27.2%. Also,
In the knitted fabric, streaky unevenness occurred in the crushed portion of the fiber, and the quality of the knitted fabric was extremely poor.

The hollow fiber yarn having a substantially triangular hollow portion shown in FIG. 1 (Experiment No. 23 (invention), having a hollow ratio of 3)
Although it was 6.2%, even in a knitted fabric, there was almost no crushing of fibers, the hollow ratio was 34.4%, and the quality of the knitted fabric was good.

[0054]

Industrial Applicability The polyester hollow fiber of the present invention has an unprecedentedly high coloring property, is lightweight, has excellent heat retention, has a dry cool feeling, has good clarity, has high strength, and has a knitted fabric. The fiber cross section is hard to collapse at the time of formation, etc.
It is of high quality.

Since it has excellent coloring properties and its effect is remarkable, it is particularly suitable as a knit material for sports among clothing materials. The polyester hollow fiber of the present invention has a coloring property,
In addition to light weight and heat retention, it also has sharpness and unique luster that are not found in conventional materials, so it is highly valuable as a differentiated new material.

[Brief description of the drawings]

FIG. 1 is a fiber sectional view showing an example of a polyester hollow fiber of the present invention.

FIG. 2 is a plan view showing a die discharge hole when the polyester hollow fiber of FIG. 1 is manufactured.

FIG. 3 is a model diagram of the polyester hollow fiber of FIG. 1;

FIG. 4 is a fiber sectional view showing an example of the polyester hollow fiber of the present invention other than FIG.

FIG. 5 is a fiber sectional view of a polyester hollow fiber of a comparative example in the present invention.

FIG. 6 is a plan view showing a nozzle discharge hole when the polyester hollow fiber of FIG. 5 is manufactured.

──────────────────────────────────────────────────続 き Continuation of front page (56) References JP-A-61-132620 (JP, A) JP-A-59-26521 (JP, A) JP-A-4-18116 (JP, A) JP-A-6-216 228815 (JP, A) JP 55-17806 (JP, B2) (58) Fields investigated (Int. Cl. ⁷ , DB name) D01F 6/86 301-307 D01F 6/62 303 D01D 5/24

Claims (1)

(57) [Claims] (1) An isophthalic acid component containing a metal sulfonate group is contained in an amount of 0.7 to 2.4 mol% based on the total dicarboxylic acid component and a polyalkylene glycol component having a molecular weight of 90 to 6000 is used in an amount of 0.2 to 2.0% based on the polyester. It is made of a modified polyester having an intrinsic viscosity (IV) of 10% by weight and having an intrinsic viscosity (IV) of 0.64 or more. The cross section of the fiber is triangular or circular, and a triangular hollow portion is formed at the center of the fiber cross section. Yes, and polyester hollow fibers having a high coloring property of hollow ratio of the middle hollow portion is characterized in that 15 to 50%.