JPH0770827A - Polyester 3-component composite fiber - Google Patents

Abstract

(57) [Summary] [Structure] The core component A, the island component B, and the sea component C are all composed of three different polyesters, and the island components B are scattered so as to surround the core component A, and the sea component In a three-component composite fiber dispersed in C without being unevenly distributed, the ratio of the melt viscosity of the core component A and the island component B to the melt viscosity of the sea component C, and the fiber after the sea component is dissolved and removed with respect to the yarn strength. A polyester-based three-component composite fiber with a specified strength ratio. [Effect] According to the present invention, in a polyester-based three-component conjugate fiber for obtaining a fabric having a novel texture having a soft touch and a feeling of swelling and softness, stability of the composite form and passage through the process It is possible to obtain a composite fiber having excellent properties and practical properties.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a polyester-based three-component composite fiber for clothing. More specifically, the present invention relates to a polyester-based three-component conjugate fiber for clothing, which has excellent stability in a composite form and high strength.

[0002]

2. Description of the Related Art In recent years, clothing fabrics have diversified needs,
The demand for higher quality is increasing, and various studies have been made. As one of them, studies have been made using a three-component composite spinning technique. For example, in JP-A-1-14321, a polyester-based three-component composite fiber composed of a highly-shrinkable core component, a low-shrinkage island component, and an easily alkali-reducing sea component provides a soft touch with tightness and waist. It is disclosed that a new texture with a texture is obtained. However, the melt viscosity of the sea component polymer used in this publication is very high as compared with the melt viscosities of the core component and the island component, and the stability of the composite form is very good. The strength, and further the strength of the fiber after the sea component is dissolved and removed, are low, and problems in practical properties such as a decrease in tear strength of the fabric and occurrence of fibrillation due to abrasion occur, and thus the application range is limited. Further, in Japanese Patent Laid-Open No. 2-26912,
It is disclosed that a new texture with softness and softness can be obtained by using a three-component composite fiber consisting of a highly shrinkable core component, a low shrinkage island component, and an alkali-reducing sea component. Has been done. However, it has been found that even when the technique of this publication is used, the same problem as in the above-mentioned JP-A-1-14321 occurs.

Various studies have been made on hot water-soluble polyesters, for example, Japanese Patent Publication No. 64-62.
Japanese Patent Publication No. 86 discloses a composite fiber using a hot water-soluble polyester obtained by copolymerizing 5-sodium sulfoisophthalic acid and isophthalic acid as one component of the sea-island type composite fiber. However, this publication merely describes a two-component composite fiber, and does not disclose any three-component composite fiber having different fineness, different shrinkage component and sea component as in the present invention. Therefore, the degree of heterogeneity,
It has not been possible to obtain a fabric having a novel texture that exhibits the characteristic of different shrinkage more effectively and has a desired tension / waist and soft touch. Also, depending on the ratio of the melt viscosity of the island component polymer and the sea component polymer, it may lead to poor spinnability due to abnormalities in the composite form, or a problem in terms of practical properties may occur due to the decrease in fiber strength after dissolution and removal of the sea component. all right.

[0004]

SUMMARY OF THE INVENTION An object of the present invention is to provide a polyester-based three-component composite fiber for obtaining a fabric having a novel texture having a soft feeling and a soft feel, and stability in operation. That is, it is to provide a polyester-based three-component conjugate fiber which is excellent in composite morphological stability and causes no practical problems.

[0005]

The object of the present invention is such that the core component A, the island component B, and the sea component C are composed of three different polyesters, and the island component B surrounds the core component A. In the three-component composite fiber which is dispersed in the sea component C without being unevenly distributed, the sea component C
Of melt viscosity (εa and εb) of core component A and island component B to melt viscosity (εc) of ε, εa / εc and ε
b / εc are both 0.80 or more and 2.50 or less, and T2 / T1 is 1.02 or more, which is the ratio of the fiber strength (T2) after the sea component is dissolved and removed to the raw yarn strength (T1). Polyester 3-component composite fiber (hereinafter referred to as composite fiber)
Can be achieved by

FIG. 1 is a composite sectional view showing an example of the composite fiber of the present invention. A is the core component A, B is the island component B, and C is the sea component C. It is necessary that the individual island component B exists in the sea component C without being unevenly distributed. That is, it is preferable that the individual island component B is separated by the sea component C, and the core component A is also separated by the sea component C. If the core component A and the individual island component B and the individual island component B are not separated by the sea component C, even if the sea component C is dissolved and removed, the core component A, the individual island component B and the individual island component B are separated. The island components B cannot be separated from each other, and the desired soft-touch texture cannot be obtained sufficiently.

In the present invention, the ratio of the melt viscosities of the core component A and the island component B to the sea component C, the stability of the composite form in spinning, the strength of the obtained raw yarn, and further the fiber after the sea component is dissolved and removed. Has a close relationship with the strength of the fiber, and by setting the melt viscosity ratio within a specific range, a composite morphology is stabilized, and a yarn having sufficient strength for high-order processing and practical use is obtained. It is possible. That is, the ratio of the melt viscosity of the core component A and the island component B to the sea component C, ε
a / εc and εb / εc are both 0.80 or more,
It should be 2.50 or less. When εa / εc or εb / εc is less than 0.80, since the melt viscosity of the sea component C is too high, a stable composite form can be obtained from the aspect of stability of the composite form, but the raw yarn strength, Furthermore, the strength of the fiber after the sea component is dissolved and removed is remarkably reduced, the passability in the higher-order processing step is deteriorated, the tear strength is low when the fabric is formed, and fibrillation due to abrasion occurs, which is a practical problem. Occurs. Conversely, εa / εc or ε
If b / εc exceeds 2.50, the melt viscosity of the sea component C will be too low, and it will be difficult to obtain a stable composite form, resulting in poor spinnability and markedly impaired operational stability. is there. The decrease in the strength of the fiber after the dissolution of the raw yarn and the sea component is considered to be caused by the following mechanism. That is, since the melt viscosity of the sea component is much higher than that of the core component and the island component, the spinning stress during spinning concentrates on the sea component, and the formation of the fiber structure of the sea component preferentially progresses at the spinning stage. On the contrary, since the core component and the island component do not apply the spinning stress so much, the fiber structure is not sufficiently formed. That is, the structure of the sea component becomes a structure spun at a higher spinning speed than the spinning speed, and conversely, the core component and the island component become a structure spun at a low spinning speed. Therefore, in the subsequent drawing, the draw ratio is determined by the sea component having the lowest drawability, the drawing is completed without the core component and the island component being sufficiently drawn, and the strength of the obtained raw yarn, and further The strength of the fiber after the dissolution and removal of the sea component decreases. Ratio of melt viscosity of the core component A and the island component B to the sea component C, εa / εc and εb, for stabilizing the composite morphology in spinning and obtaining sufficient yarn strength for higher-order processing and practical use. The range of / εc is preferably 0.80 or more,
2.00 or less, and more preferably 0.80 or more and 1.
It is 80 or less. The melt viscosity is a value measured by Capillograph 1B manufactured by Toyo Seiki Seisaku-sho, Ltd. at 290 ° C. and a shear rate of 1200 (1 / sec).

The composite fiber of the present invention has a ratio of the fiber strength (T2) after the sea component is dissolved and removed to the raw fiber strength (T1), T2.
It is necessary that / T1 is 1.02 or more. T2 /
When the ratio of T1 is less than 1.02, in the sea component dissolving / removing step, for example, the alkaline hot water treatment, the non-dissolved components, that is, the core component A and the island component B are deteriorated due to hydrolysis and the like, and the fabric is obtained. At that time, the tear strength is low, and fibrillation occurs due to abrasion, which causes a problem in practical use, resulting in deterioration of product durability and generation of fluff, thus degrading quality. The ratio of T2 / T1 is preferably 1.05 or more. The measurement of the fiber strength after dissolution and removal of sea components is carried out by the following method. After the sea length of the composite fiber is removed at a treatment temperature of 100 ° C. or less, the strength and elongation are measured by a usual method, and the fineness of the fiber after dissolution and removal of sea components is calculated from the following formula to obtain the strength. ◎ Fineness = Raw yarn fineness x (Core component composite ratio + Island component composite ratio)

The composite fiber of the present invention is unique in that after the fabric is formed from the fiber, the sea component C is dissolved and removed with, for example, hot water or an alkali hot aqueous solution, and the core component A and the island component B are separated. It is what you get. In the conjugate fiber of the present invention, the fineness of the core component A constituting the conjugate filament is preferably 1.0 denier or more and 5.0 denier or less in terms of texture surface, particularly tension / waist. If the fineness of the core component A is less than 1.0 denier, it is not possible to impart sufficient tension and stiffness to the fabric, and conversely, if it exceeds 5.0 denier, the fabric has a hard texture.

From the viewpoint of soft touch, the fineness of the island component B constituting the composite fiber is preferably 0.1 denier or more and 0.6 denier or less. When the fineness of the island component B is less than 0.1 denier, a soft touch feeling can be obtained, but the softness of the fabric is too emphasized. Conversely, when it exceeds 0.6 denier, a soft touch feeling is obtained. I can't. The shape of the island component B is not particularly limited, but a circle, an ellipse, and a flat shape are preferable, and a flat shape is particularly preferable. By making the shape of the island component B flat, it is possible to express a unique surface touch.
When the island component B has a flat shape, the flatness is preferably 1.5 or more and 5.0 or less. If the flatness is less than 1.5, it is insufficient to obtain a unique surface touch due to flattening. On the contrary, if the flatness exceeds 5.0, the island component becomes thin, resulting in a flat surface. The bending rigidity with respect to the swelling decreases, the swelling feeling decreases, and it becomes difficult to obtain a peach touch with an ultrafine thread. The flatness referred to in the present invention is the ratio L1 / of the maximum length L1 of the island component in the fiber circumferential direction and the maximum length L2 of the island component in the fiber radial direction in the composite cross-sectional view shown in FIG. It is L2. The number of the island component B present in the composite fiber is preferably 4 or more and 20 or less, more preferably 5 or more and 15 or less, from the feeling surface. The number of island components B is 3
When the number of the island components B is 21 or more, the effect of the core component A having a large fineness is too emphasized, resulting in a hard texture, and when the number of the island components B is 21 or more,
The effect of the island component B having an extra fineness is emphasized too much and the texture becomes too soft.

The conjugate fiber of the present invention is required to be formed of three kinds of polymers which are different from each other in terms of feel and quality of the obtained cloth.
It is necessary to combine polymers having good compatibility so as not to cause separation between the composite components during knitting and weaving.
When peeling occurs between composite components during knitting or weaving, fluff,
Looseness and yarn breakage easily occur, which causes problems in terms of processability and product quality. Preferred examples of the polymer constituting the core component A include dibasic acids such as adipic acid, sebacic acid, isophthalic acid, diphenyldicambonic acid and naphthalene dicarboxylic acid, oxyacids such as oxybenzoic acid, and diethylene glycol, propylene glycol, Polyesters obtained by copolymerizing one kind or two or more kinds of glycols such as polyethylene glycol, 5-sodium sulfoisophthalic acid, 2,2 bis {4- (2-hydroxyethoxy) phenyl} propane and the like can be mentioned. But this is not the case. As the core component A used in the present invention, the peach touch effect by the island component B is increased, and a swelling feeling is imparted when the fabric is formed. Is preferred. The dry heat shrinkage is measured by the following method. The yarn length L0 of the composite fiber before sea removal was measured and 100
After de-sealing at a processing temperature of ℃ or less, dry heat treatment at 200 ℃ 1
Do 5 minutes. Next, the core component and the island component are separated and the yarn length is measured. The core component yarn length is LH and the island component yarn length is LL. The dry heat shrinkage is calculated by the following formula. Dry heat shrinkage of core component (%) = (L0-LH) / L0 × 1
00 Dry heat shrinkage (%) of island component = (L0-LL) / L0 x 1
00

The island component B preferably has a low shrinkage from the viewpoint that it gives a feeling of swelling when a fabric is formed due to the difference in shrinkage ratio with the core component A. As a preferred example of the polymer constituting the island component B, a polyethylene terephthalate homopolymer may be substantially used, or a copolymer or an additive may be added to improve the feel.

As the sea component C, it is preferable that the core component A and the island component B can be easily separated. For that purpose, a polymer having an alkali weight loss ratio higher than that of the core component A and the island component B by 30 or more is required. It is preferably hot water-soluble polyester. The alkali weight loss ratio is measured by the following method. Each filament having the same denier circular cross-section, which is composed of the polymers A, B and C of the present invention, is added to a 3% aqueous solution of caustic soda at a bath ratio of 1: 125 and a temperature of 9
The treatment was carried out at 8 to 100 ° C., the required time TA, TB and TC until the weight loss rate reached 70% were measured, and the alkali weight loss ratio of the polymer C to the polymers A and B was calculated by the following formula. Alkali weight loss ratio of Polymer C to Polymer A = TA / T
Alkali weight loss ratio of C polymer C to polymer B = TB / T
C The weight loss rate was calculated by the following equation, where W0 is the weight before alkali treatment and W1 is the weight after alkali treatment. Weight loss rate (%) = (W0-W1) / W0 × 100

The hot water solubility is measured by the following method. 1 g of chips was added to 100 g of hot water at 95 ° C. and dissolved with a magnetic stirrer for 15 minutes,
A substance in which a polymer was substantially dissolved was made soluble in hot water.
The reason why it is more preferable to use hot water-soluble polyester as the sea component C is as follows.

The first reason is that the difference in shrinkage between the core component A and the island component B after the sea component C is dissolved and removed can be made larger, and a larger swelling feeling can be obtained when the fabric is formed. It can be given. That is, by using the hot water-soluble polyester as the sea component C, the sea component C can be dissolved and removed in the refining process without providing a separate dissolution process. Therefore, until the core component A and the island component B are separated. The thermal history of can be minimized. By minimizing the thermal history until the separation in this way, it becomes possible to make the shrinkage difference between the core component A and the island component B after the sea component C have been dissolved and removed larger.

The second reason is that the fiber strength after dissolution and removal of sea components can be maintained high. That is, since the sea component can be dissolved and removed without using a hot alkaline aqueous solution, the core component A and the island component B are not deteriorated at all when the sea component is dissolved and removed, and therefore the fiber strength after the sea component is dissolved and removed. Can be kept high.

The third reason is that the fabric manufacturing process can be simplified. That is, since the sea component can be dissolved and removed in the scouring step, the sea component dissolving and removing step using the hot alkaline aqueous solution can be omitted, and the safety and hygiene and the manufacturing cost can be remarkably improved.

The hot water-soluble polyester used as the sea component C has terephthalic acid as a main acid component, and 5-sodium sulfoisophthalic acid and isophthalic acid as copolymerization components are copolymerized in a total amount of 20 mol% or more and 50 mol% or less. A hot water-soluble polyester is particularly preferable. When the total copolymerization amount of 5-sodium sulfoisophthalic acid and the isophthalic acid component is less than 20 mol%, sufficient hot water solubility cannot be obtained and flaky insoluble matter remains, which is not preferable. On the contrary, when the total copolymerization amount of 5-sodium sulfoisophthalic acid and the isophthalic acid component exceeds 50 mol%, hot water solubility is sufficient, but cold water also partially elutes, which is not preferable in handling. .

Polymer A forming the composite fiber of the present invention,
B and C are matting agents within a range that does not impair the effects of the present invention,
Additives such as antioxidants, optical brighteners, flame retardants, and ultraviolet absorbers can also be included.

The spinning pack required for spinning the conjugate fiber according to the present invention is described in JP-A-57-47938, No. 3
The apparatus shown in FIG. 2 and FIG. 2 of JP-A-57-82526 can be used as a suitable example. As the spinneret required for spinning the composite fiber according to the present invention, a device shown in FIG. 3 and disclosed in JP-A-1-14321 can be used as a suitable example.

In producing the conjugate fiber according to the present invention, it can be applied to any process such as a method of continuously performing spinning and drawing steps, a method of once winding as an undrawn yarn and then drawing, or a high-speed yarn making method. can do.
If necessary, false twisting or yarn processing such as air entanglement may be performed.

[0022]

The present invention will be described in more detail with reference to the following examples. The methods for measuring the characteristics and the like used in the examples are as follows.

(A) Cross-sectional composite state stability After mainly dyeing the sea component with a cationic dye or a disperse dye, it was cut to a thickness of 5 μm and the composite state was observed from the dyed cross section. ⊚: No composite abnormalities ○: Ten single fibers with composite abnormalities are multifilament yarns
Less than% △: The abnormal composite single fiber is 10 of the multifilament yarn
% Or more and less than 30% x: 30 abnormal composite single fibers are multifilament yarns
%that's all

(B) Passability in higher-order processing process Evaluation was made on the basis of the frequency of occurrence of yarn breakage during weaving in three stages. ◯: No thread breakage Δ: No thread breakage, but fluff occurred ×: Thread breakage

(C) Evaluation of Feeling Three kinds of basic feelings, which are important feelings as a cloth for high-grade clothes, "tension waist", "soft touch feeling", and "bulging feeling", are sensed by 10 skilled engineers. An evaluation was conducted, and for each of them, the conventional use of mixed yarn was used as a standard (5 points) and 10
It was evaluated on a perfect score. Average the obtained scores, 0 or more 2
A score of less than 4 was rated as 5 ×, a score of 2 or more and less than 4 was rated as ×, a score of 4 or more and less than 6 was rated as Δ, a score of 6 or more and less than 8 was rated as ◯, and a score of 8 or more and 10 or less was rated as ⊚. ◎: Especially excellent ○: Excellent △: Normal ×: Inferior × ×: Especially inferior

(D) Tear strength According to JIS L 1096.

Examples 1-5 and Comparative Examples 1 and 2 Polyethylene terephthalate having a melt viscosity of 1450 poise as the island component B and isophthalic acid 7.1 as the core component A.
Mol%, 2,2 bis {4- (2-hydroxyethoxy)
A modified polyester having a melt viscosity of 1520 poise copolymerized with 4.0 mol% of phenyl} propane was copolymerized with 7.0 mol% of 5-sodium sulfoisophthalic acid as a sea component C. Using polyester, composite ratio A / B of core component A, island component B, and sea component C
/ C is 40/47/13, the number of island components B is 7, and the spinning temperature is 29.
It was wound at 0 ° C. and a speed of 1500 m / min. Next, drawing was carried out to obtain a multifilament yarn of 90 denier and 12 filaments (after the sea component was dissolved and divided, the core component was 3 denier and the island component was 0.5 denier). The characteristics of the obtained yarn are shown in Table 2. The sea component C was insoluble in hot water. Using the multifilament yarn, weft driving was performed to obtain a plain woven fabric. Concentration of the fabric is 2%
In a caustic soda aqueous solution, the weight reduction treatment is performed at 98 to 100 ° C for 30 minutes to dissolve and remove sea constituents, and to remove 200% in a relaxed state.
Dry heat treatment at 5 ° C for 5 minutes, dyeing, and finishing were performed. Table 3 shows the process passability and practical properties of the obtained woven fabric.

In Comparative Example 1, the core component A with respect to the sea component C
Since the ratio of the melt viscosity of the island component B and the island component B is too large, the strength of the raw yarn and the fiber strength after the dissolution and removal of the sea component are high, but the stability of the composite form is lacking, and the yarn formability is deteriorated due to the composite abnormality. However, it was difficult to obtain a stable quality product due to complex abnormalities. In Comparative Example 2, the sea component C
Since the ratio of the melt viscosities of the core component A and the island component B to the core component is too small, the stability of the composite form is good, but the raw yarn strength is low, and problems such as yarn breakage during weaving occur and high-order processing It is difficult to obtain a product that can withstand practical use because the passage property is deteriorated, the fiber strength is greatly reduced after the sea component is dissolved and removed, and the tear strength of the fabric is decreased.

In Examples 1 and 2, the ratio of the melt viscosity of the core component A and the island component B to the sea component C was rather large,
The stability of the composite form was slightly inferior, but the strength of the raw yarn and the fiber strength after dissolution and removal of the sea component were high, the high-order processability and the tear strength of the fabric were very good, and the texture was also appropriate. Tension / waist, swelling due to difference in shrinkage ratio between core component A and island component B, and dry feeling due to flattening of island component B have a peach-touch feel, and have outstanding features that have never existed before. Was. In addition, in Example 5, the stability of the composite form is very good, and even on the texture side, there is a feeling of moderate tension / waist, swelling, and dry feeling due to the flatness of the island component B, and a peach-touch feeling. Although it had excellent characteristics that were not available in the past, the fiber strength after dissolution and removal of sea components was slightly low, and therefore the tear strength was slightly low. In addition, in Examples 3 and 4, the raw yarn strength, the fiber strength after dissolution and removal of the sea component, the stability of the composite form, and the high-order processing passability are very good, and the texture of the obtained fabric is also appropriate. It had a peach-touch texture with firmness / waist, swelling and dryness, and had outstanding features that were unprecedented.

Comparative Example 3 Spinning was carried out in the same manner as in Example 1, except that the melt viscosities of the core component A, the island component B and the sea component C were changed as shown in Table 1.
Stretching was performed to obtain a multifilament yarn (after the sea component was dissolved and divided, the core component was 3 denier and the island component was 0.5 denier). The characteristics of the obtained yarn are shown in Table 2. A plain woven fabric was prepared in the same manner as in Example 1 and subjected to finishing processing. Table 3 shows the process passability and practical properties of the obtained woven fabric.

In Comparative Example 3, the melt viscosity ratio of the core component A and the island component B to the sea component C was sufficiently satisfied, and although the raw yarn strength was high, the fiber strength after the sea component was dissolved and removed was large, so that It was difficult to obtain a product that could withstand practical use because it had poor passability in high-order processing steps and low tear strength.

[0032]

[Table 1]

[Table 2]

[Table 3] Examples 6 to 9 Using the polymer used in Example 4, the number of islands of the island component B was changed as shown in Table 4, and spinning and drawing were performed in the same manner as in Example 4 to obtain multifilament yarns. (After sea component dissolution and splitting, the core component is 3 denier and the island component is 0.5 denier). The characteristics of the obtained yarn are shown in Table 4. A plain weave fabric was prepared and finished as in Example 4. Table 5 shows the process passability and practical properties of the obtained woven fabric.

In Example 6, the strength of the raw yarn, the strength of the fiber after dissolution and removal of the sea component, the stability of the composite morphology, the high-order processing passability, etc. were very excellent. Since the flatness was very large, the bending stiffness of the island component with respect to the flat plane was slightly reduced, and the swelling feeling was slightly insufficient, and the peach touch feeling was also slightly reduced due to the small number of islands. Further, in Example 9, the stability of the composite form, the high-order processing passability, etc. were very excellent, but the tear strength was slightly low because the fiber strength after dissolution and removal of the sea component was slightly low. Also on the texture surface, a peach-touch texture was obtained, but the flatness of the island component B was small, so the dry feeling due to flattening was insufficient. In Examples 7 and 8, the strength of the raw yarn, the strength of the fiber after dissolution and removal of the sea component, the stability of the composite form, and the process passability are very good, and even in the texture surface, a suitable tension
It had a swelling feeling due to the difference in contraction between the waist and core components and the island component, and a peach-touch texture with a dry feeling due to the flattening of the island component B, and had excellent features that were not previously available.

[0034]

[Table 4]

[Table 5] Examples 10 to 13 and Comparative Examples 4 and 5 In Example 7, as the sea component C, 10.0 mol% of 5-sodium sulfoisophthalic acid and 35 of isophthalic acid.
Using hot water-soluble polyesters having different melt viscosities as shown in Table 6 in which mol% was copolymerized, the number of islands was set to 5, and spinning and drawing were performed in the same manner as in Example 7 to obtain a multifilament yarn (sea component dissolution division). Later, the core component is 3 denier and the island component is 0.4 denier). The characteristics of the obtained yarn are shown in Table 7. The alkali weight loss ratio of the sea component C to the core component A and the island component B was determined to be 500 or more because the sea component C was completely dissolved in a few seconds and the detailed weight loss ratio could not be measured. Regarding the hot water solubility of the sea component C, all had good solubility. A plain woven fabric was prepared in the same manner as in Example 1, and the woven fabric was subjected to weight reduction treatment in a hot aqueous solution of sodium tripolyphosphate (0.2 g / l) at 98 ° C. for 10 minutes to dissolve and remove the sea component C. Dry heat treatment for 5 minutes, dyeing, and finishing were performed. Table 8 shows the process passability and practical properties of the obtained woven fabric.

In Comparative Example 4, the core component A with respect to the sea component C
And the melt viscosity ratio of the island component B is too large, the stability of the composite form is lacking, and the yarn formability is deteriorated due to the composite abnormality.
Also, in terms of quality, it was difficult to obtain a stable quality product due to a complex abnormality. Further, in Comparative Example 5, since the ratio of the melt viscosity of the core component A and the island component B to the sea component C is too small, the strength of the raw yarn is low, and troubles such as yarn breakage during weaving occur and passing through a high-order finishing process. As the sex worsens,
Since the fiber strength after dissolving and removing the sea component is low, the tear strength of the fabric is lowered, and it is difficult to obtain a product that can withstand practical use.

In Examples 10 and 11, the melt viscosity ratios of the core component A and the island component B to the sea component C were rather large, and the stability of the composite morphology was slightly inferior. The subsequent fiber strength is high, high-order processability and tear strength of the fabric are very good, moderate tension and waist on the textured surface, and swelling due to the difference in shrinkage ratio between the core component A and the island component B, It had a dry and peach-touch texture due to the flattening of the island component B, and had excellent features that were not available in the past.

In Examples 12 and 13, the raw yarn strength, the fiber strength after dissolution and removal of the sea component, the stability of the composite form, and the high-order processing passability were very good, and the texture of the obtained fabrics was also appropriate. It has a peach-touch feel with a firmness and waist, a swelling feeling due to the difference in contraction between the core component and the island component, and a dry feeling due to the flattening of the island component B, and had excellent features that have never been seen before. .

[0038]

[Table 6]

[Table 7]

[Table 8] Examples 14 to 16 In Example 12, hot water-soluble polyester having a copolymerization amount of 5-sodium sulfoisophthalic acid and isophthalic acid changed as shown in Table 9 as sea component C was used, and the number of islands was 1
A multifilament yarn was obtained by carrying out spinning and drawing in the same manner as in Example 12 as 0 (after the sea component was melted and divided, the core component was 4 denier and the island component was 0.5 denier).
The characteristics of the obtained yarn are shown in Table 10. Regarding the solubility of sea component C in hot water, the one used in Example 14 could not be completely dissolved in hot water and an insoluble matter remained. Further, the material used in Example 16 was partially dissolved in cold water.
On the other hand, the one used in Example 15 had good solubility. The alkali weight loss ratio of the sea component C to the core component A and the island component B was determined to be 500 or more because the detailed weight loss ratio could not be measured because the sea component C was completely dissolved in a few seconds. A plain weave fabric was prepared in the same manner as in Example 12, and finishing processing was performed. Table 11 shows the process passability and practical properties of the obtained woven fabric.

In Example 14, the strength of the raw yarn, the strength of the fiber after dissolution and removal of the sea component, the stability of the composite form, and the ability to pass through high-order processing are very good, and the obtained fabric has a suitable feel.・ It has a peach-touch feel with a waist, swelling feeling and a flat feeling of the island component B with a dry feeling, and it had excellent characteristics not previously available, but the hot water solubility of the sea component C was Since it was not sufficient, some insoluble matter remained, and the quality was slightly inferior.

In Example 16, the strength of the raw yarn, the strength of the fiber after dissolution and removal of the sea component, and the stability of the composite form were very good, and the obtained fabric had a suitable feel, waist and core component. It had a peachy touch with a swelling feeling due to the difference in shrinkage of the island component and a dry feeling due to the flattening of the island component B, and had excellent features that were not available in the past, but the sea component C was used in cold water. Since some of them also melted, some fluff was generated during weaving, and it was slightly inferior in terms of high-order processing passability.

In Example 15, the strength of the raw yarn, the fiber strength after dissolving and removing the sea component, the stability of the composite form, and the ability to pass through the high-order processing are very good, and the obtained fabric has an appropriate texture. It has a peachy touch with a swelling feeling due to the difference in shrinkage between the waist and core components and the island component, and a dry feeling due to the flattening of the island component B, and had excellent features that were not previously available.

[0042]

[Table 9]

[Table 10]

[Table 11]

[0043]

EFFECT OF THE INVENTION The polyester-based three-component conjugate fiber according to the present invention specifies the ratio of the melt viscosity of the core component A and the island component B to the sea component C, and the ratio of the raw yarn strength and the fiber strength after the sea component is dissolved and removed. In addition, the stability of the composite form can be significantly improved, and the process passability and practical properties are also excellent, and it has an unprecedented advantage that has tension / waist, soft touch feeling, and swelling feeling. It is possible to stably manufacture a fabric having a good texture.

[Brief description of drawings]

FIG. 1 is a composite cross-sectional view showing a preferred example of a composite fiber constituting a three-component composite fiber of the present invention.

FIG. 2 is a cross-sectional view of a yarn obtained by removing sea components from the composite fiber of FIG.

FIG. 3 is a longitudinal sectional view of a spinneret device preferably used to obtain the three-component conjugate fiber of the present invention.

[Explanation of symbols]

 1: Inflow hole for core component A 2: Inflow hole for island component B 3: Inflow hole for sea component C 4: Polymer gathering part 5: Mouth discharge hole

Claims (3)

[Claims] 1. The core component A, the island component B, and the sea component C are each composed of three different polyesters, and the island components B are scattered so as to surround the core component A, and in the sea component C. In a three-component composite fiber dispersed without being unevenly distributed, the ratio of the melt viscosity (εa and εb) of the core component A and the island component B to the melt viscosity (εc) of the sea component C, εa /
εc and εb / εc are both 0.80 or more, 2.
It is 50 or less, and T2 / T1 is 1.02, which is the ratio of the fiber strength (T2) after the sea component is dissolved and removed to the raw thread strength (T1).
The above is a polyester-based three-component composite fiber characterized by the above. 2. The polyester-based three-component conjugate fiber according to claim 1, wherein hot water-soluble polyester is used as the sea component C. 3. A hot water-soluble polyester obtained by copolymerizing, as the sea component C, a main acid component of terephthalic acid, and copolymerizing 5-sodium sulfoisophthalic acid and isophthalic acid as a copolymerizing component in a total amount of 20 mol% or more and 50 mol% or less. The polyester-based three-component conjugate fiber according to claim 1 or 2, wherein