JP2000226734A - Conjugate fiber, combined filament yarn and woven or knitted fabric - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a conjugate fiber and a combined filament yarn excellent in a soft feeling and color developing properties and capable of providing a woven or a knitted fabric having biodegradability and the woven or knitted fabric using the conjugate fiber or the combined filament yarn. SOLUTION: This conjugate fiber is an island-in-sea type conjugate fiber containing a thermoplastic polymer having solubility in hot water as a sea component and a polyester consisting essentially of an aliphatic polyester having >=130 deg.C melting, point as an island component and the compounding ratio of he sea component/island component is (10/90) to (50/50). The single fiber fineness of the island component after removing the sea component is 0.01-1 dtex. The conjugate fiber and the combined filament yarn are formed into a woven or a knitted fabric, then treated with hot water and converted into an ultrafine state.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to sea-island type composite fibers, mixed yarns and woven / knitted fabrics capable of producing an aliphatic polyester ultrafine yarn by a splitting treatment. A sea-island type conjugate fiber which is excellent in soft feeling, has good coloring properties, and is capable of producing an aliphatic polyester ultrafine yarn having biodegradability.
The present invention relates to a mixed yarn and a woven or knitted fabric.

[0002]

2. Description of the Related Art Conventionally, a polyester ultrafine yarn having a single yarn fineness of 0.01 to 1 dtex made of polyethylene terephthalate has been used for a woven woven fabric or a wiping cloth. However, the ultrafine yarn made of polyethylene terephthalate has a high refractive index of about 1.6, so that the color developability of the ultrafine yarn is not sufficient. Further, since the Young's modulus of the polymer itself was high, it was not possible to impart a sufficient soft feeling.

On the other hand, in recent years, environmental problems have become social problems in particular. However, aromatic polyesters represented by polyethylene terephthalate have extremely high durability and do not easily decompose in the natural environment. Unless performed, there is a drawback that they remain semi-permanently. In order to solve this problem, various biodegradable fibers have recently been proposed.

For example, Japanese Patent Application Laid-Open Nos. Hei 7-11517 and Hei 8-158154 propose the production of aliphatic polyester fibers by direct spinning. The present invention relates to biodegradable fibers having a large single-filament fineness of 2 dtex or more, and in any case, it was impossible to impart softness and coloring to clothing.

Japanese Patent Application Laid-Open No. 9-41223 discloses that
A decomposable composite fiber using two types of biodegradable polymers having different crystallinities is disclosed. However, this proposal is also aimed at nonwoven fabric applications, and the single-fiber fineness of the obtained fiber is at a level of 2 to 3 dtex even after division, and the uniformity of division is poor because of physical division. Yes, it was impossible to impart softness and coloring to clothing.

[0006]

SUMMARY OF THE INVENTION The object of the present invention is to achieve an ultra-fine aliphatic polyester which is excellent in softness and coloring when used as a woven or knitted fabric for clothing and which has biodegradability, which could not be achieved by the above prior art. An object of the present invention is to provide a conjugate fiber, a mixed yarn, and a woven or knitted fabric for producing a yarn.

[0007]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a thermoplastic polymer having a solubility in hot water as a sea component and having a melting point of 13%.
It is a sea-island type composite fiber having a polyester mainly composed of an aliphatic polyester at 0 ° C. or higher as an island component, wherein the sea component is
The composite ratio of the island component is 10/90 to 50/50, and the single-fiber fineness of the island component after removing the sea component is 0.01 to 1d.
This can be achieved by a composite fiber characterized by being a tex.

The present invention includes the following preferred embodiments.

(A) The number of island components is 3 to 100.

(B) The aliphatic polyester is a polyester containing L-lactic acid as a main component.

(C) A multifilament yarn obtained by mixing a multifilament yarn made of a thermoplastic polymer having a single yarn fineness of 2 to 6 dtex with the above-mentioned composite fiber.

(D) The boiling water shrinkage (SW) of the multifilament yarn composed of a thermoplastic polymer and the boiling water shrinkage (SWA) of the composite fiber are expressed by the following equation: SWA + 5 ≦ SWB ≦ SWA +
25%.

(E) A woven or knitted fabric using at least a part of the composite fiber and / or the mixed fiber.

(F) After weaving and knitting using at least a part of the above-mentioned composite fiber and / or the above-mentioned mixed fiber, the single-filament fineness obtained by hot water treatment is 0.01 to 1 dtex.
Woven and knitted fabric containing aliphatic polyester ultrafine yarn at 130 ° C or higher.

[0015]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail.

The conjugate fiber of the present invention is a sea-island type conjugate fiber, and it is necessary that the island component is formed of a polyester mainly composed of an aliphatic polyester. By forming the island component with a polyester mainly composed of an aliphatic polyester, it is possible to improve the soft feeling, the coloring property and the biodegradability which are the objects of the present invention. Here, “mainly composed of aliphatic polyester” means that 80% of the island component is used.
It means that at least weight% is formed from aliphatic polyester.

In the present invention, it is necessary that the melting point of the polyester mainly composed of the aliphatic polyester forming the island component of the conjugate fiber is 130 ° C. or more. Melting point is 1
If the temperature is lower than 30 ° C., the fibers are fused and integrated in the dyeing process, so that the effect of ultrafineness cannot be exhibited, a soft feeling cannot be obtained, and melting defects occur during friction heating, and the quality of the product is significantly deteriorated. I do. The melting point of the aliphatic polyester is preferably 150 ° C. or higher, more preferably 170 ° C. or higher. Here, the melting point means a peak temperature of a melting peak obtained by DSC measurement.

In the present invention, by using such an aliphatic polyester, unlike the aromatic polyester, a good soft feeling is exhibited. This good soft feeling
This is because the Young's modulus of the aliphatic polyester yarn is clearly lower than that of the aromatic polyester yarn.

The aliphatic polyester used in the present invention has a melting peak peak temperature of 1 measured by DSC.
There is no particular limitation as long as the temperature is 30 ° C. or higher, and polylactic acid, polyglycolic acid, polyhydroxybutyrate, polyhydroxybutyrate valerate, and blends and modified products thereof can be used. Among them, polylactic acid is most preferable in consideration of the balance of properties such as melting point, Young's modulus, and refractive index for improving the softness, color development and biodegradability, which are the objects of the present invention. The polylactic acid is preferably a polyester containing L-lactic acid as a main component. Mainly containing L-lactic acid means that 60% by weight or more of the component is composed of L-lactic acid,
It may be a polyester containing D-lactic acid in a range not exceeding the weight%. In order to improve fiber properties such as strength, the molecular weight of polylactic acid is preferably as high as possible, usually at least 50,000, preferably at least 100,000, more preferably 10
~ 300,000.

In order to reduce the melt viscosity, a polymer such as polycaprolactone or polybutylene succinate can be used as an internal plasticizer or as an external plasticizer. Further, inorganic fine particles and organic compounds as a matting agent, a deodorant, a flame retardant, a yarn friction reducing agent, an antioxidant, a coloring pigment and the like can be added as required.

On the other hand, the thermoplastic polymer forming the sea component of the conjugate fiber of the present invention needs to have hot water solubility. Normally, when producing ultrafine yarns made of polyethylene terephthalate from sea-island type composite fibers, it is common to use a modified polyester having high alkali solubility as the sea component, but an aliphatic polyester is used for the island component. If the sea-island composite fiber is split with an alkali solution, the aliphatic polyester of the aliphatic polyester is highly degradable by the alkali solution. Not only is it not possible, but also in some cases, the decomposition of the aliphatic polyester of the island component proceeds first, so that it is difficult to even obtain an ultrafine yarn.

In order to suppress the decomposition of the aliphatic polyester as the island component, the polymer used as the sea component needs to have hot water solubility as a characteristic. The term “hot-water solubility” as used in the present invention means that the polymer is completely dissolved in hot water when immersed in hot water at 95 ° C. for 60 minutes. By using the conjugate fiber as the sea component, the sea component can be dissolved and removed in the scouring process generally used in the weaving and knitting process, and the island component in the conjugate fiber can be completely divided into the respective components.

Examples of the thermoplastic polymer having solubility in hot water used in the present invention include polyvinyl alcohol, a polyethylene glycol copolymer, and a hot water-soluble polyester. Among them, a hot water-soluble polyester is preferred from the viewpoint of melt spinning at the same time as the aliphatic polyester. As the hot water soluble polyester, JP-A-1
-272820, JP-A-61-296120, JP-A-63-165516 and JP-A-63-216516
5-159, such as described in
Copolymerized polyester obtained by copolymerizing sodium sulfoisophthalic acid and isophthalic acid in a specific amount, copolymerized polyester obtained by copolymerizing 5-sodium isophthalic acid, isophthalic acid and polyalkylene glycol or a derivative thereof in a specific amount, 5-sodium sulfoisophthalic acid, isophthalic acid Copolymerized polyesters obtained by copolymerizing an acid and an aliphatic dicarboxylic acid in a specific amount are exemplified.

The composite ratio of the sea component / island component of the composite fiber of the present invention must be 10/90 to 50/50 from the viewpoint of the stability of the composite form, the spinning property and the productivity. If the compounding ratio of the sea component is less than 10%, a compound abnormality occurs to cause poor splitting, or even if the compound form is normal, poor splitting due to poor dissolution of the sea component occurs. A certain soft feeling cannot be obtained. On the other hand, if the composite ratio of the sea component exceeds 50%, the productivity is reduced, and when the woven or knitted fabric is formed, "katsutsuki" is generated, and the woven or knitted fabric has no rebound feeling. In the present invention, the preferred composite ratio of the sea component / island component of the composite fiber is 15/85 to 40.
/ 60.

Further, in the conjugate fiber of the present invention, the single-filament fineness of the island component after removing the sea component needs to be 0.01 to 1 dtex in order to achieve both softness and coloring. By setting the single-fiber fineness of the island component to 0.01 to 1 dtex, it is possible to impart the soft feeling and the coloring property, and further, the yarn-making stability, which are the objects of the present invention. Single yarn fineness
If it is less than 0.01 dtex, the soft feeling is improved, but sufficient color developability cannot be obtained. Conversely, single yarn fineness is 1
If it exceeds dtex, the coloring property and the spinning property are good, but the fineness of the single yarn is increased, so that the soft feeling is lowered. In the present invention, the preferred range of single yarn fineness is 0.
05 to 0.8 dtex. The cross-sectional shape of the conjugate fiber may be an irregular cross section such as a flat cross section, a hollow cross section, or a triangular cross section in addition to the round cross section. The fiber surface may be completely covered with the sea component or the island component may be partially exposed. Further, the cross-sectional shape of the island component after removing the sea component may be a flat cross section or a triangular cross section in addition to a round cross section.

In the conjugate fiber of the present invention, the number of island components in the single fiber is 3 to 100 in order to achieve both a spinning property and a soft feeling.
It is preferred that If the number of island components is less than 3, the single-filament fineness of the island components required for obtaining the soft feeling of the present invention is 0.01.
In order to obtain １1 dtex, it is necessary to reduce the single-fiber fineness of the conjugate fiber, and the fineness of the conjugate fiber may deteriorate the spinnability. Further, when the number of island components exceeds 100, the single-filament fineness of the island components required to obtain the soft feeling of the present invention is 0.
Although it is easy to obtain 01 to 1 dtex, the spinning properties may be degraded due to complex abnormalities due to the complicated die structure. The more preferable range of the number of island components in the single fiber for satisfying both the spinning property and the soft feeling is 6 to 80.

The composite fiber of the present invention can be used as a single yarn in the production of woven or knitted fabrics or the like, but can also be used as a mixed yarn with other multifilament yarns. When used as a mixed yarn, the tension and waist of the fabric,
In order to improve the resilience, it is preferable to blend with a multifilament yarn composed of a thermoplastic polymer having a single yarn fineness of 2 to 6 dtex. In addition, if the ratio between the single-filament fineness of the aliphatic polyester ultrafine yarn obtained by removing the sea component of the conjugate fiber of the present invention and the single-filament fineness of the multifilament yarn made of a thermoplastic polymer is too large, dyeing is performed. When woven and knitted due to the difference in gender, `` irritation '' occurs and the product quality may be degraded, so the aliphatic polyester ultrafine yarn and thermoplastic polymer obtained by removing the sea component of the composite fiber The ratio of single yarn fineness to multifilament yarn
It is preferably 100 times or less.

The thermoplastic polymer forming another multifilament yarn mixed with the conjugate fiber of the present invention is an aliphatic polyester which forms an aliphatic polyester ultrafine yarn obtained by removing a sea component of the conjugate fiber. It may be
Other polyesters and polyamides may be used. Examples of other polyesters include polyethylene terephthalate, polybutylene terephthalate, and polypropylene terephthalate, and examples of polyamides include nylon 6, nylon 66, and nylon 610. In each case, it may contain a copolymer component of 15 mol% or less.

When used as a mixed fiber, a multifilament yarn made of a thermoplastic polymer having a large single-fiber fineness is made to have a higher shrinkage than a conjugate fiber in order to improve the swelling, softness and resilience. It is preferable to set the boiling water shrinkage (SWB) of the multifilament yarn made of a thermoplastic polymer and the boiling water shrinkage (SWA) of the composite fiber.
However, it is preferable to satisfy SWA + 5 ≦ SWB ≦ SWA + 25 (%).

The boiling water shrinkage is measured by the following method. After separating the mixed fiber into a multifilament yarn comprising the composite fiber of the present invention and a thermoplastic polymer having a large single-filament fineness, skein, and measuring the sample length L0 under a load of 0.09 cN / dtex, then applying no load In boiling water for 15 minutes. After the treatment, the sample is air-dried, the sample length L1 is measured under a load of 0.09 cN / dtex, and calculated by the following equation.

Boiling water shrinkage (SW) (%) = [(L0−
L1) / L0] × 100 When used as a mixed fiber, the mixed ratio of the composite fiber and the multifilament yarn made of a thermoplastic polymer is 40: 6.
The range of 0 to 80:20 is preferable from the viewpoint of improving tension, waist, and resilience.

In the production of the composite fiber of the present invention, for example, a large number of core-sheath composite streams as shown in FIG. 1 of JP-B-44-18369 are formed, and these core-sheath composite streams are formed. A method of introducing sea-island composite fibers by introducing into one discharge hole, or another polymer provided between radial slits as shown in FIG. 10 of JP-B-49-81613. As a preferred example, a method of forming a sea-island type composite fiber in which a sea component forms a radial continuous layer by forming a composite by an inflow hole can be used.

In producing the conjugate fiber of the present invention, the method can be applied to any process such as a method in which spinning and drawing steps are continuously performed, a method in which an undrawn yarn is once wound and then drawn, or a high-speed yarn forming method. . Further, if necessary, yarn processing such as false twisting or air entanglement may be performed.

Further, as a method for producing a mixed fiber using the conjugate fiber of the present invention, any of the conventionally known post-mixing method and spinning method may be used.

The conjugate fiber and / or mixed fiber of the present invention can be treated with hot water to remove sea components, and has a single-fiber fineness of 0.01 to 1 dtex and an aliphatic polyester ultrafine yarn having a melting point of 130 ° C. or more. And a soft feeling, a coloring property, and a peach touch feeling can be exhibited by the ultrafine yarn. In order to express such a soft feeling, a coloring property, and a peach touch feeling, it can be obtained by using the conjugate fiber and / or mixed fiber of the present invention for at least a part of a woven or knitted fabric. Further, it is preferable to use a mixed fiber in order to improve the tension, waist, rebound, and swelling of the woven or knitted fabric. In addition, the sea component removal step by hot water treatment is preferably performed after weaving and knitting from the viewpoint of the permeability of the weaving and knitting step. By removing the sea component, it is possible to obtain a woven or knitted fabric containing an aliphatic polyester ultrafine yarn composed of an island component, which is excellent in softness and coloring, and has a peach touch feeling.

In the case of manufacturing a woven or knitted fabric, there is no restriction on the weaving machine and the weaving structure.
By using it at least in part, it is possible to produce a good woven or knitted material having a soft feeling and a coloring property, which is the object of the present invention.

The woven or knitted fabric of the present invention is particularly preferably used for clothing in view of its softness and color development.

[0038]

The present invention will be described in more detail with reference to the following examples. Each characteristic value in the examples was obtained by the following method.

A. Melting point Perkin Elmer's differential scanning calorimeter (DSC-7)
Was measured at a heating rate of 15 ° C./min, and the peak temperature of the obtained melting peak was defined as the melting point.

B. Melt Viscosity The relationship between the shear rate at 260 ° C. and the melt viscosity was measured using a Capillograph manufactured by Toyo Seiki Co., Ltd. A die with L / D = 10/1 (mm) was used for the measurement, and the shear rate was 1000 sec.
The viscosity at the time of ^-1 was defined as the melt viscosity of the sample. In addition, about polybutylene succinate, it measured at 190 degreeC.

C. Feeling characteristics (softness, coloring, resilience, swelling) For each item, a sensory test was performed by comparing the sample with a reference sample, and evaluated on a 4-point scale. And they were comprehensively evaluated, and "Excellent" was indicated by "A", "Excellent" was indicated by "A", "Normal" was indicated by "A", and "Inferior" was indicated by "X". The reference sample had an island component fineness of 0.05 after dissolution and removal of the sea component.
Made of dtex polyethylene terephthalate (PET)
The PET composite fiber was woven and alkali-reduced in the same manner as the sample, and was evaluated as "poor".

D. The cross-section composite-state-stable composite fiber was treated with hot water for 1 hour to dissolve and remove the sea component, and then cut to a thickness of 5 μm to observe the split state.

◎: No abnormal splitting at all ○: The number of island components of abnormal splitting is less than 5% of the whole Δ: The number of island components of abnormal splitting is 5% or more and less than 10% of the whole ×: The number of island components of abnormal splitting is E. 10% or more of the whole The spinnability was evaluated in three stages based on the number of yarn breaks in a spinning time of 2 hours.

：: no thread breakage Δ: slight thread breakage (1 to 3 times) ×: frequent thread breakage And 3 out of the stretchability of a drawn yarn breakage count in making five stretchability 2kg wound pirn.

：: no thread breakage Δ: slight thread breakage (1 to 3 times) ×: frequent thread breakage [Examples 1 to 3 and Comparative Examples 1 and 2] Melting point as island component
Melt viscosity at 172 ℃, 260 ℃, 1000sec ^-1 is 1250poise
Water-soluble polyester obtained by copolymerizing 10.0 mol% of 5-sodium sulfoisophthalic acid and 35 mol% of isophthalic acid as sea components using poly L-lactic acid (weight average molecular weight 170,000, L form ratio 100%) Using a sea-island type compounding die having 70 island components and 10 holes, the composite ratio was changed as shown in Table 1 by a composite spinning machine, and the spinning temperature was 260.
The film was wound at a temperature of 1200C and a take-up speed of 1200 m / min. Subsequently, the obtained undrawn yarn is stretched using a normal hot roll-hot roll drawing machine at a drawing temperature of 80 ° C and a heat setting temperature of 120 ° C so that the drawn yarn has an elongation of 35%. Drawing was performed together to obtain a multifilament drawn yarn (composite fiber) of 50 dtex-10fil. Table 1 shows the physical properties of the obtained multifilament drawn yarn.

After the obtained multifilament drawn yarns are combined into two yarns, they are subjected to a sweet twist of 200 t / m and used as warps and wefts to weave plain woven fabrics. At the same time, after dissolving and removing the sea components, perform dry heat setting at 135 ° C, further treat with a 2.5% aqueous sodium carbonate solution at 80 ° C for 10 minutes (weight reduction processing), then dye with wet heat at 120 ° C, finish with dry heat at 140 ° C I did a set. Table 1 shows the results of evaluating the obtained woven fabric characteristics.

[0047]

[Table 1] In Examples 1 and 2, the composite state stability, the yarn formability and the stretchability were very good, and the obtained woven fabric had an unprecedented good soft feeling, and the color development was very good. Was.

In Example 3, although the composite state stability, the yarn formability and the stretchability were very good and the softness was unprecedented, the single yarn fineness after removing the sea component was slightly higher than 0.04 dtex. Due to the thinness, the color developability was slightly inferior to Example 1.

On the other hand, in Comparative Example 1, the composite ratio of the sea component was 5%.
Therefore, a complex abnormality in which the island component was not completely divided was observed even when the sea component was dissolved and removed, and only the woven fabric having an inferior soft feeling was obtained due to the occurrence of the complex abnormality.

In Comparative Example 2, the composite ratio of the sea component was 5
Since it is as high as 5%, the spinnability and the stretchability are slightly inferior, and the voids between the fibers are formed large by the removal of the sea component, so that only a woven fabric with a prolonged touch can be obtained.

[Examples 4 to 7 and Comparative Examples 3 and 4] Except that the number of island components was changed as shown in Table 2 and the composite ratio was 30/70 using a sea-island composite base having 24 holes. Spinning was performed in the same manner as in Example 1, and the film was wound at a take-up speed of 1500 m / min. The obtained undrawn yarn was drawn in the same manner as in Example 1 to obtain a 50dtex-24fil multifilament drawn yarn (composite fiber). Table 2 shows the physical properties of the obtained multifilament drawn yarn.

The obtained multifilament drawn yarn was woven and processed in the same manner as in Example 1, and the results of evaluation of the obtained woven fabric characteristics are shown in Table 2.

[0053]

[Table 2] In Examples 4 and 5, the composite state stability, the yarn formability and the stretchability were very good, and the obtained woven fabric had an unprecedented good soft feeling, and the color development was very good. there were.

In Example 6, the composite state stability, the yarn formability and the stretchability were very good, and the softness was unprecedented, but the single yarn fineness after removing the sea component was low.
The color development was slightly inferior to that of Example 5 because it was slightly thinner at 0.04 dtex.

In Example 7, since the number of island components was slightly as large as 90, some complex abnormalities were observed in which the island components were not completely divided even when the sea component was dissolved and removed, and the spinning properties and stretchability were slightly higher. Although inferior, the obtained woven fabric had an unprecedented good soft feeling and very good coloring property.

On the other hand, in Comparative Example 3, since the single component fineness of the island component was 1.40 dtex after dissolving and removing the sea component, the color development was good, but only a woven fabric having poor softness was obtained.

In Comparative Example 4, since the number of island components was as large as 150, complex abnormalities were observed in which the island components were not completely divided even when the sea component was dissolved and removed, and the spinnability and stretchability were slightly inferior. Was something. Further, the obtained woven fabric had an unprecedented softness, but the island component single yarn fineness was too small at 0.009 dtex, so that the coloring property was poor.

[Examples 8 to 12] Using the poly-L-lactic acid chips used in Example 1, a spinning temperature of 26 using a normal spinning machine.
A spinneret at 0 ° C. so that the fineness composition of the drawn yarn is as shown in Table 3.
The discharge amount was changed, and the undrawn yarn was wound at a speed of 2000 m / min. Subsequently, the obtained undrawn yarn is subjected to a normal hot roll-
Using a hot roll type stretching machine, stretching is performed at a stretching temperature of 80 ° C. and a heat setting temperature of 70 ° C. so that the stretching ratio of the stretched yarn is 35%, and the stretched yarn (multi-layer made of thermoplastic polymer) is drawn. (Filament yarn) was obtained. However, in Example 14, stretching was performed at a heat setting temperature of 100 ° C. Table 3 shows the yarn physical properties of the obtained drawn yarn.

Next, the drawn yarn thus obtained and the multifilament drawn yarn (composite fiber) obtained in Example 1 were air-entangled to obtain a mixed fiber.

The obtained mixed fiber is used for warp, and the weft is obtained by weaving and processing in the same manner as in Example 1 using two multifilament drawn yarns of Example 1. went. Table 3 shows the results of evaluating the obtained woven fabric characteristics.

[0061]

[Table 3] The woven fabrics obtained in Examples 8 and 9 were excellent in softness and coloring, and excellent in resilience and swelling, and had unprecedented good texture.

In Examples 10 and 11, a woven fabric having an unprecedented softness, excellent color development, and excellent swelling was obtained. In Example 10, however, the single-fiber fineness of the mixed fibers was obtained. Was slightly inferior to the sense of rebound. In Example 11, on the other hand, the single-fiber fineness of the mixed fiber was slightly thick, and a sense of coarse hardness was felt. Further, the single-fiber fineness ratio of the mixed fiber was large, so that slight “irritation” occurred. Was.

In Example 12, the softness and the coloring were excellent.
In addition, a fabric having an unprecedented texture excellent in resilience was obtained, but the swelling feeling was slightly insufficient due to a slightly small difference in shrinkage.

Examples 13 and 14 30dtex-12fil,
Polyethylene terephthalate multifilament yarn with boiling water shrinkage of 23.3%, and 30dtex-12fil, boiling water shrinkage
35.1% 15.0 mol% of isophthalic acid and 2,2 bis {4- (2
-Poly (ethylene terephthalate) multifilament yarn obtained by copolymerizing 7.1 mol% of (human peroxyethoxy) phenyl perfluorocarbon with the multifilament drawn yarn (composite fiber) obtained in Example 1
Were mixed, woven and processed in the same manner as in Example 8. Table 4 shows the results of evaluating the obtained woven fabric characteristics.

[0065]

[Table 4] The woven fabric obtained in Example 13 had an unprecedented texture excellent in softness and coloring, and excellent in rebound and swelling.

In Example 14, a woven fabric having an unprecedented texture excellent in softness and coloring, and also excellent in repulsion was obtained. Was.

[Examples 15 and 16] In Example 10, the multifilament drawn yarn (composite fiber) of Example 1 was used.
As a drawn yarn (a multifilament yarn made of a thermoplastic polymer) for blending with the above, spinning and drawing were performed in the same manner as in Example 12 except that the ejection amount was changed so that the fineness configuration shown in Table 5 was obtained. Yarn was obtained. This drawn yarn was mixed, woven and processed in the same manner as in Example 12. Table 5 shows the results of evaluating the obtained woven fabric characteristics.

[0068]

[Table 5] The woven fabric obtained in Example 15 had an unprecedented texture excellent in softness and coloring, and excellent in rebound and swelling.

On the other hand, Example 16 had an unprecedented good texture which was excellent in coloring properties and also excellent in rebound and swelling feelings. The effect of expressing the soft feeling by the aliphatic polyester ultrafine yarn obtained by dissolving and removing the sea component of the fiber was slightly inferior.

[Example 17] In producing a mixed fiber in Example 9, two multifilament drawn yarns (composite fibers) obtained in Example 1 were supplied and air-entangled, and then mixed. Yarn was obtained.

Using the obtained mixed fiber, weaving and processing were performed in the same manner as in Example 9. Table 5 shows the results of evaluating the obtained woven fabric characteristics.

Example 17 had an unprecedented texture which was excellent in softness and coloring, and also excellent in swelling. However, since the blending ratio of the composite fiber was slightly high, the repulsion was improved. However, the effect of a thick drawn yarn (multifilament yarn made of a thermoplastic polymer) with a single yarn fineness mixed therewith was slightly inferior.

Comparative Example 5 As an island component, melting point: 112 ° C., 190
Spinning and drawing were carried out in the same manner as in Example 1 except that a polybutylene succinate chip having a melt viscosity of 780 poise at 1000 ° C. and 1000 sec ⁻¹ was used to obtain a multifilament drawn yarn (composite fiber). The stretching conditions were a stretching temperature of 70.
C. and a heat setting temperature of 90.degree.

The obtained multifilament drawn yarn was woven and processed in the same manner as in Example 1 except that the dyeing temperature was set at 100 ° C. and the dry heat setting temperature was set at 100 ° C. to obtain a woven fabric. In the obtained woven fabric, the single fibers were fused together, a soft feeling was not obtained, and the coloring property was extremely poor because dyeing could be performed only at a low dyeing temperature.

[0075]

According to the present invention, there is provided a sea-island type composite fiber comprising a thermoplastic polymer having hot water solubility as a sea component and a polyester mainly composed of an aliphatic polyester having a melting point of 130 ° C. or more as an island component. And the composite ratio of sea component / island component is 1
It is a composite fiber and a mixed fiber having a single fiber fineness of 0.01 to 1 dtex of the island component after removing the sea component from 0/90 to 50/50, and a soft feeling and color development by using this composite fiber. It is possible to obtain a woven or knitted fabric having excellent biodegradability.

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 4L036 MA05 MA16 MA39 PA01 PA03 PA33 UA01 UA30 4L041 AA07 AA20 AA25 BA04 BA05 BA16 BC05 BC20 BD14 CA05 CA11 DD01 DD11 EE06 EE07 EE14 EE15 EE20 4L048 AA20 AA29 AB07 CA01

Claims (7)

[Claims] 1. A sea-island type composite fiber comprising a thermoplastic polymer having hot water solubility as a sea component and a polyester mainly composed of an aliphatic polyester having a melting point of 130 ° C. or more as an island component, wherein the sea component is / Complex ratio of island component is 10 / 90-5
A composite fiber, wherein the single component fineness of the island component after removing the sea component is 0.01 to 1 dtex. 2. The conjugate fiber according to claim 1, wherein the number of island components is 3 to 100. 3. The conjugate fiber according to claim 1, wherein the aliphatic polyester is a polyester containing L-lactic acid as a main component. 4. A multifilament yarn comprising a thermoplastic polymer having a single yarn fineness of 2 to 6 dtex and a conjugate fiber according to any one of claims 1 to 3, which are mixed. Mixed yarn. 5. The boiling water shrinkage (SW) of a multifilament yarn comprising a thermoplastic polymer and the boiling water shrinkage (SWA) of a conjugate fiber are expressed by the following equation: SWA + 5 ≦ SWB ≦ SWA + 25.
The mixed fiber according to claim 4, wherein (%) is satisfied. 6. A woven or knitted fabric comprising at least a part of the composite fiber according to claim 1 and / or the mixed fiber according to claim 4. 7. A single yarn obtained by weaving and knitting using at least a part of the conjugate fiber according to claim 1 and / or the mixed fiber according to claim 4 or 5, followed by hot water treatment. A woven or knitted product containing an aliphatic polyester ultrafine yarn having a fineness of 0.01 to 1 dtex and a melting point of 130 ° C or more.