JPH11217732A - Polyester conjugate fiber - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a polyester fiber having unconventionally excellent dyeability, high color developability and good lightfastness, and also having excellent see-through-proofness. SOLUTION: This polyester conjugate fiber is such one that the core component A consists of a polyester copolymerized with metal sulfonate group-bearing isophthalic acid component at 0.5-3.0 mol.% and glycol component at 0.5-5.0 wt.% based on the total acid components of the polyester and the sheath component B consists of another polyester copolymerized with the metal sulfonate group-bearing isophthalic acid component at 0.5-3.0 mol.% based on the total acid components of the polyester, the core component A contains 3.0-10.0 wt.% of inorganic particles, and the cross-sectional area ratio A/B is (50:50) to (95:5).

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a polyester fiber having excellent dyeing properties, high coloring properties, good light fastness and excellent anti-sagging properties.

[0002]

2. Description of the Related Art Synthetic fibers using polyester as a polymer have a drawback that, when formed into a fabric, the clothes and bare skin worn below can be seen through due to the characteristics of the polymer being transparent. As a countermeasure, by adding inert inorganic particles to the polymer, opacity is obtained, and anti-transparency is obtained. However, if a large amount of inert inorganic particles are added to the fiber in order to obtain high sheer-prevention properties, the amount of inert inorganic particles that appear on the fiber surface increases, and the yarn guide in the yarn-making process, weaving process, etc. There is a problem that defects such as fluff are likely to occur in the generation of wear and high-order processing.

As a countermeasure against this, for example, Japanese Patent Application Laid-Open No. 62-57
As disclosed in JP-A-920-920 and JP-A-8-144151, a method has been proposed in which fibers are formed into a core-sheath composite yarn and inorganic particles are added to the core component. However, in this method, a certain degree of see-through preventing property is obtained but not at a satisfactory level.To obtain high see-through preventing property, it is necessary to add a large amount of inorganic particles. This has the disadvantage that a large amount of inorganic particles causes problems such as a decrease in fiber strength and a decrease in yarn-making properties. Furthermore, this method (Japanese Unexamined Patent Publication No.
In Japanese Patent Application Laid-Open No. 57920/1992), the dyeing property is poor and the coloring property is not good. Therefore, the solution is made by generating micropores in the sheath component. However, it is necessary to carry out a chemical treatment to generate the micropores. Yes, there are problems in terms of cost increase in higher processing steps, environmentally responsive care using chemical substances, and control of micropore development.

[0004]

SUMMARY OF THE INVENTION The present invention solves the above-mentioned problems and provides a polyester fiber having excellent dyeing properties, high coloring properties, good light fastness and excellent anti-sheer properties. The purpose is to do so.

[0005]

SUMMARY OF THE INVENTION The present invention has the following configuration to attain the above-mentioned object. That is, the present invention relates to "a core component and a sheath component each containing 0.5 to 3.0 mol% of an isophthalic acid component containing a metal sulfonate group based on all acid components of the polyester, and a core component containing 0.5 to 3.0 mol% of a glycol component. To 5.0 wt% of a copolymerized polyester, and the core component contains inert inorganic particles.
The above-mentioned object can be achieved by "a polyester composite fiber containing 0 to 10.0 wt% and having a cross-sectional area ratio of the core component and the sheath component of 50:50 to 95: 5". Hereinafter, the present invention will be described in detail.

[0006]

BEST MODE FOR CARRYING OUT THE INVENTION The fiber used in the present invention is a core-sheath type polyester composite fiber in which a core component is covered by a sheath component in a cross section of the fiber and the core component is not exposed on the surface. Here, the core-sheath type is only required that the core component is completely covered by the sheath component, and it is not always necessary to arrange them concentrically. The cross-sectional shape of the fiber is also round, flat, triangular, square, pentagonal as long as it is a core-sheath type, but it is easy to obtain stable thread-forming property and high-order workability. A square or the like is preferable.

In the present invention, it is necessary that the core component contains 3.0 to 10.0% by weight of inert inorganic particles. Here, the inert inorganic particles are specifically silica sol,
There are silica, alkyl-coated silica, alumina sol, titanium oxide, calcium carbonate and the like, but any material may be used as long as it is chemically stable when added to the polyester. Silica sol, silica, alkyl-coated silica and titanium oxide are preferred from the viewpoints of chemical stability, cohesion and ease of use, and titanium oxide is more preferred. In this case, the average particle size of titanium oxide is preferably 1 μm or less, more preferably 0.7 μm or less from the viewpoint of dispersibility. Further, the maximum particle size is preferably 5 μm or less, more preferably 3 μm or less from the viewpoint of spinning properties. When the content of the inert inorganic particles is less than 3.0% by weight, the light reflectance of the inert inorganic particles is reduced, and the anti-transparency is insufficient, so that the object cannot be achieved. On the other hand, the content is 10.0 w
If it exceeds t%, it causes a reduction in the spinnability, and the rate of increase in the filtration pressure in the spinning step becomes too large to be industrially practical. Further, the strength of the obtained conjugate fiber is reduced, and in high-order processing, the quality such as fluff and breakage of single yarn is reduced, which is not preferable.

The polyester used in the present invention is:
A polyester containing ethylene glycol or 1,4-butanediol as a main glycol component and terephthalic acid or an ester thereof as a main dicarboxylic acid component.

In the present invention, the core component and the sheath component include:
An isophthalic acid component having a metal sulfonate group (hereinafter, referred to as an S component) is used in an amount of 0.1 to the total acid component of the polyester.
It is necessary to use a polyester copolymerized at 5 to 3.0 mol%. The S component referred to herein is a compound represented by the following formula, but is preferably dimethyl (5-sodium sulfo) isophthalate, bis-2-hydroxyethyl (5-sodium sulfo) isophthalate, bis-4-
Hydroxybutyl (5-sodium sulfo) isophthalate and the like can be mentioned. When the copolymerization amount of this S component is 0.5
When the amount is less than mol%, the dye is not sufficiently dyed with respect to the basic dye, so that the excellent dyeing property and high coloring property, which are the objectives of the present invention, cannot be obtained, and therefore, only those having insufficient light fastness can be obtained. Absent. On the other hand, if the copolymerization amount of the S component is more than 3.0 mol%, the S component increases the intermolecular force between the polymers, which causes a decrease in the yarn strength, and consequently a decrease in the yarn forming property and the higher processing. It is not preferable because it causes deterioration of the quality in the above.

[0010]

(Equation 1) Further, in the present invention, the core component contains a glycol component (hereinafter referred to as a G component) in an amount of 0.5 to 0.5 in addition to the S component.
It is necessary to copolymerize at 5.0 wt%. Here, the G component is a compound such as diethylene glycol, triethylene glycol, tetraethylene glycol, propylene glycol, 1,4-cyclohexanedimethanol, 1,4-cyclohexanediol, polyethylene glycol, or polytetramethylene glycol. , Tetraethylene glycol, polyethylene glycol and polytetramethylene glycol can be preferably used. When the G component is copolymerized with the polyester in which the S component is copolymerized, the structural relaxation of the polyester occurs, the reactivity between the S component and the basic dye is improved, and the dyeability is improved.
Color development is improved. Further, since the intermolecular force is reduced by the action of the G component, the appropriate stretching ratio is increased and the fiber strength is increased. With this effect, when the S component is more than 3.0 mol%, the decrease in the intermolecular force is small, and the change in the appropriate stretching ratio is hardly observed. Therefore, the fiber strength does not increase.
Therefore, from this point as well, the copolymerization amount of the S component needs to be 3.0 mol% or less. At this time, the G component is 0.5w
When the amount is less than t%, the structural relaxation in the polyester is not sufficiently performed, so that the reactivity between the S component and the basic dye is low. The robustness is also insufficient. Further, since the effect of lowering the intermolecular force is small, the appropriate draw ratio does not increase. On the other hand, G
If the amount of the component is more than 5.0 wt%, the decrease in the melting point of the polymer will be large, and the heat resistance of the polymer will be reduced, resulting in a decrease in the spinning property. Further, the heat resistance of the conjugate fiber itself is also reduced, which leads to a decrease in quality in high-order processing, which is not preferable. Therefore, the copolymerization amount of the G component needs to be 5.0 wt% or less, preferably 4.0 wt% or less, and more preferably 3.0 wt% or less.

As described above, by copolymerizing the G component with the core component, a decrease in fiber strength caused by the addition of inert inorganic particles is prevented by the effect of improving fiber strength due to the effect of reducing the intermolecular force. As a result, it is possible to obtain a fiber having high sheer-prevention property without lowering the fiber strength. Further, by copolymerizing the G component, the dispersibility of the inert inorganic particles in the core component is improved, and there is an effect that aggregation of the inert inorganic particles is suppressed. As a result, the rate of increase in filtration pressure at the time of spinning caused by the aggregation of the inert inorganic particles can be kept low, and the light reflectance of the fiber is improved and uniform by reducing the aggregation of the inert inorganic particles. Therefore, it is possible to obtain high see-through prevention.

Here, the copolymerization amount of the S component of the core component and the sheath component is at least the same, and preferably the copolymerization amount of the sheath component is larger than that of the core component. When dyeing is carried out using a basic dye, the dye first reacts with the S component on the fiber surface and sequentially reacts with the S component inside the fiber. However, the core component polymer is more easily dyed than the sheath component polymer due to the action of the G component. Therefore, at least the same amount of copolymerization of the S component of the core component and the sheath component,
Preferably, by increasing the copolymerization amount of the sheath component, the action of the G component of the core component and the ease of dyeing of the sheath component are offset, and the core component is first dyed deeply, and the dyed state of the sheath component is insufficient. It can be prevented that the dyeing state of the yarn as a whole is insufficient and unnatural spots occur.

In order to obtain the effect of the G component under the copolymerization of the S component, that is, to prevent the fiber strength from decreasing due to the intermolecular force lowering effect and to improve the dyeability, the G component is also copolymerized with the sheath component. No problem. Also in this case, the amount of the G component needs to conform to the range in the case of copolymerization with the core component.

Further, in the present invention, the cross-sectional area ratio of the core component and the sheath component in the fiber cross section is 50:50 to 95: 5.
It is necessary to be. When the ratio of the core component is less than 50%, the light reflectance of the yarn is reduced, and sufficient anti-transparency cannot be obtained. On the other hand, if the amount of the sheath component is less than 5%, the inert inorganic particles are likely to appear on the surface of the fiber, causing staining spots at the time of dyeing. This causes problems such as a decrease in the properties of the yarn, and a tendency for the yarn path guide to be easily worn during yarn production or weaving. This cross-sectional area ratio is preferably from 60:40 to 95: 5, more preferably from 70:30 to 90:10 from the viewpoints of the see-through prevention property, the dyeing property, and the coloring property.

The production method is not particularly limited as long as the method can obtain the core-sheath composite yarn of the present invention. The following is an example of the production method. Isophthalic acid containing a metal sulfonate group is added to the polyester in an amount of 0.1% based on the total acid component of the polyester.
5 to 3.0 mol%, and 0.5 to 5.
0 wt% copolymerized, and inert inorganic particles were added in a range of 3.0 to 10.0.
Polyester containing wt% is used as a core component, and polyester obtained by copolymerizing isophthalic acid containing a metal sulfonate group in an amount of 0.5 to 3.0 mol% with respect to all acid components of the polyester is used as a sheath component. These are heated to a melting point or higher, melted, compounded from the same die so that the core component is completely covered by the sheath component, and discharged. Cool this,
After solidification, 1200 to 1800 m / min. And take up. This is stretched at a stretching ratio of 2.0 to 4.0 times, and
By heat setting at 00 to 150 ° C., the core-sheath composite yarn of the present invention is obtained.

[0016]

EXAMPLES The present invention will be specifically described below with reference to Examples and Comparative Examples, but the present invention is not limited thereto. In addition, each measured value in an Example and a comparative example is a value measured and judged by the following method.

A. Knitted fabric (10 cm) obtained from the filament to be evaluated
× 10 cm) with Estrol BlueN-3RL1.
5owf, acetic acid 0.5ml / L, sodium acetate 0.15g
/ L, bath ratio 1: 100, dyeing with 98 ° C. aqueous solution for 60 minutes, followed by hydrosulfite 2 g /
L, sodium hydroxide 2 g / L, nonionic surfactant 2 g /
L is washed with an aqueous solution of 80 ° C. for 20 minutes, washed with water and dried. The dyed knitted fabric is subjected to photobleaching using a fade meter in accordance with JIS-L1044 and measured on a blue scale basis.

B. Dyeability (%) Knitted fabric obtained from filament to be evaluated (10 cm
× 10 cm) with Estrol BlueN-3RL1.
5owf, acetic acid 0.5ml / L, sodium acetate 0.15g
The dyeing is carried out for 60 minutes with an aqueous solution of 98.degree. Thereafter, the concentration of the dye remaining in the aqueous solution after removing the knitted fabric is measured, and the dye adsorption rate is determined. Judgment of the dyeing property is made when the adsorption rate is 50% or more.

C. Using a knitted fabric dyed in the same manner as the dyeability evaluation described above,
The L value is measured using a digital measurement color difference calculator in a state where the knitted fabrics are overlapped to the extent that the irradiation light does not pass (6 to 10 sheets). In the determination of the coloring property, an L value of 14.0 or less is determined to be good.

D. Composite ratio A filament to be evaluated is collected, and a cross section is photographed at a magnification of 400 to 600 times using a phase contrast microscope. Using this photograph, the composite ratio is determined from the cross-sectional area ratio of the core component and the sheath component.

Example 1 and Comparative Example 1 As the polyester for the core component, dimethyl (5-sodium sulfo) isophthalate (S component) was prepared by using dimethyl terephthalate, ethylene glycol, lithium acetate dihydrate,
After adding to a mixture of antimony trioxide and subjecting it to transesterification by a conventional method, polyethylene glycol having an average molecular weight of 1,000 (component G) and trimethyl phosphate,
And a titanium oxide slurry was added so as to have a content of 6.5 wt%, and a polycondensation reaction was carried out by a conventional method to obtain a copolymerized polyester.

Dimethyl (5-sodium sulfo) isophthalate (S component) is used as the polyester for the sheath component.
Was used to obtain a copolymerized polyester in the same manner as described above. At this time, several kinds of samples were obtained by changing the amount of dimethyl (5-sodium sulfo) isophthalate (S component) in the core component as shown in Table 1. The amount of polyethylene glycol (G component) in the core component and the amount of dimethyl (5-sodium sulfo) isophthalate (S component) in the sheath component were 1.0 wt% and 2.4 mol%, respectively.
And

Using the obtained copolyester for the core component and the copolyester for the sheath component, a core / sheath composite ratio of 8 was obtained.
A composite spinning machine was used so that the spinning temperature was 30: 0.
0 ° C., spinning speed 1500 m / min. , A core-sheath composite was formed from the same die and spun to obtain an undrawn yarn. The obtained undrawn yarn was subjected to a drawing temperature of 90 ° C., a heat treatment temperature of 120 ° C., and a drawing speed of 800 m / min. Then, stretching was performed at an appropriate stretching ratio so that the residual elongation was 40%, to obtain a drawn yarn of 75 denier and 36 filaments at the level shown in Table 1, and the dyeing properties, coloring properties, light fastness and yarn making properties were obtained. Was evaluated.

As a result, no. In the case of No. 1, the dyeability was poor, the coloring property was insufficient, and the light fastness was unsatisfactory as grade 3. No. In Nos. 2 to 4, satisfactory dyeing properties and coloring properties were obtained, and the light fastness was satisfactory as Grade 4 and the yarn-making properties were also good. No. In the case of No. 5, both the dyeing property and the coloring property were at a level where there was no problem, and the light fastness was of the fourth grade, but the yarn-making property was poor.

[0025]

[Table 1] Example 2 and Comparative Example 2 When obtaining the copolyester for the core component and the copolyester for the sheath component in the same manner as in Example 1, dimethyl (5-sodium sulfo) isophthalate (S
Component) was varied as shown in Table 2 to obtain several types of samples. The amount of dimethyl (5-sodium sulfo) isophthalate (S component) in the core component and the amount of polyethylene glycol (G component) were 1.7 mol%, respectively.
1.0 wt%.

Thereafter, using these, a core-sheath composite yarn was obtained in the same manner as in Example 1, and the dyeing properties, color development properties, light fastness, and yarn-making properties were evaluated. As a result, no. In No. 6, the dyeing properties were poor, the coloring properties were insufficient, and the light fastness was unsatisfactory as grade 2. No. In Nos. 7 to 9, satisfactory dyeing properties and coloring properties were obtained, and light fastness of grade 4 was satisfactory, and yarn-making properties were also good. No. 1
In the case of No. 0, both the dyeing property and the coloring property were at a level at which there was no problem, and the light fastness was grade 4, but the yarn-making properties were poor.

[0027]

[Table 2] Example 3 and Comparative Example 3 When obtaining the copolyester for the core component and the copolyester for the sheath component in the same manner as in Example 1, the amount of polyethylene glycol (G component) in the core component is shown in Table 3. Several samples were obtained with the changes shown. The amount of dimethyl (5-sodium sulfo) isophthalate (S component) in the core component and the amount of dimethyl (5-sodium sulfo) isophthalate (S component) in the sheath component were each 1.
It was 7 mol% and 2.4 mol%. Thereafter, these were used to obtain a core-sheath composite yarn in the same manner as in Example 1, and evaluation of dyeing properties, coloring properties, light fastness, and yarn-making properties were performed.

As a result, no. In No. 11, the dyeing properties were poor, the coloring properties were insufficient, and the light fastness was unsatisfactory as grade 3. No. In 12 to 14, dyeability,
The coloring properties were good and the light fastness was grade 4 which was satisfactory, and the spinning property was also good. No. In No. 15, both the dyeing property and the coloring property were satisfactory, and the light fastness was grade 4. However, the yarn-making property was poor.

[0029]

[Table 3] Example 4 and Comparative Example 4 When a core-sheath composite yarn was obtained by using the copolyester for the core component and the copolyester for the sheath component obtained in the same manner as in Example 1, the core-sheath composite ratio was shown. The sample was changed as shown in FIG. 4 to obtain several kinds of samples, and the evaluation of the sheer-proof property was performed. In this case, the amount of dimethyl (5-sodium sulfo) isophthalate (S component) in the core component was 1.7 mol%, and the amount of polyethylene glycol (G component) was 1.0 w
The amount of dimethyl (5-sodium sulfo) isophthalate (S component) in the sheath component was 2.4 mol%.

As a result, no. In Nos. 16 and 17, the see-through resistance was insufficient. No. In Nos. 18 to 23, sufficient sheer-proofing property and good dyeing property were obtained. No.
In No. 24, although the see-through resistance was sufficient, the dyeability was poor.

[0031]

[Table 4] Example 5 and Comparative Example 5 When a core-sheath composite yarn was obtained using the copolyester for the core component and the copolyester for the sheath component obtained in the same manner as in Example 4, as shown in Table 5, By changing the content of titanium oxide in the core component, several kinds of samples were obtained, and evaluation of the sheer-proof property was performed.

As a result, no. In the case of No. 25, the sheer-proof property was insufficient. No. In Nos. 26 to 29, sufficient sheer-proofing properties were obtained, and the spinning properties were also good. No.
In No. 30, although the sheer-proofing property was sufficient, the spinning property was poor.

[0033]

[Table 5]

[0034]

The polyester composite fiber obtained in the present invention has excellent dyeing properties, high coloring properties, and good light fastness, which cannot be obtained with conventional fibers, and has a core component. The inert inorganic particles have excellent sheer preventing properties. This polyester fiber is a material suitable for use in sports such as swimsuits and warm-up suits, and as a raw yarn for various types of clothing, including light-colored clothing with a color pattern utilizing its excellent dyeability, high coloring and anti-transparency.

[Brief description of the drawings]

FIG. 1 is a diagram showing an example of a cross-sectional shape of a core-sheath composite yarn according to the present invention.

[Explanation of symbols]

 A: core component B: sheath component

Claims (2)

[Claims] An isophthalic acid component containing a metal sulfonate group in the core component and the sheath component is contained in an amount of 0.5 to 3.0 mol% with respect to the total acid component of the polyester, and a glycol component is contained in the core component in an amount of 0.5 to 3.0 mol%. 5.0% by weight of a copolymerized polyester, and 3.0% of inert inorganic particles as a core component.
A polyester composite fiber containing 10.0 wt% and a cross-sectional area ratio of a core component and a sheath component of 50:50 to 95: 5. 2. The polyester composite fiber according to claim 1, wherein the inert inorganic particles are titanium oxide.