JP3157644B2 - Humidity-controlling fiber and method for producing the same - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to moisture-controlling fibers, yarns and fabrics whose fiber diameter changes reversibly in response to changes in humidity, and to a method for producing the same. In detail, for example, when used for clothing, if the humidity inside the clothing increases due to sweating, the fiber diameter expands and the moisture release area increases, effectively releasing the water remaining in the clothing, while stopping the sweating When the humidity inside the clothing begins to decrease, the fiber diameter becomes smaller, the moisture release area becomes smaller, the chill caused by excessive diffusion of moisture is suppressed, and moisture-regulating fibers and yarns that can always provide comfortable and comfortable clothing And a fabric, and a method for producing the same.

[0002]

2. Description of the Related Art Synthetic fibers such as polyester and polyamide have many excellent properties such as easy-care properties, and are used in various fields. Low in water absorption and moisture absorption, when used for clothes, etc.
It is less comfortable to wear than natural fibers such as hemp and wool.

Various proposals have been made to improve the above-mentioned drawbacks of synthetic fibers such as polyester fibers. For example, a method of graft-polymerizing a hydrophilic compound to a polyester constituting the fiber, kneading the hydrophilic compound into the polyester, and the like. Methods and methods of applying a hydrophilic compound to the fiber surface are known. However, in the case of a method in which a hydrophilic compound is graft-polymerized, if a large amount of the hydrophilic compound is introduced to impart sufficient hydrophilicity to the fiber, the original properties of the polyester fiber are lost, and the method of kneading the hydrophilic compound is used. In the case of (1), the texture of the fiber, especially the texture, tends to be poor, and in the case of the method of applying the hydrophilic compound, there is a disadvantage that the hydrophilic compound falls off from the fiber surface due to friction, washing, etc., resulting in no durability. are doing.

Further, as another method, it has been proposed to form a composite fiber from a hydrophobic polymer and a hydrophilic polymer. As one example, a hydrophobic polyester and a hygroscopic polyamide are combined into a laminated type. Known flat composite fibers are known. However, this flat conjugate fiber is not practical because it has drawbacks such as deformation of the fiber cross section and peeling of the bonded portion during post-processing steps such as drawing, false twisting and weaving.

[0005]

SUMMARY OF THE INVENTION An object of the present invention is to have excellent hygroscopicity and water absorbency.
It is an object of the present invention to provide a synthetic fiber having excellent humidity-controlling ability and a yarn and a fabric made of the same, which do not cause a feeling of swelling or chills even when sweating. Furthermore, an object of the present invention is to provide a humidity-controlling synthetic fiber which is excellent in handleability and does not cause deformation of a fiber cross section or peeling of a bonded portion in a post-processing step or the like, and a yarn and a fabric made of the same.

[0006]

As a result of repeated studies by the present inventors to solve the above-mentioned problems, it was found that a polyamide having high hygroscopicity and a polyester having an affinity for the polyamide were combined in a bonded structure. To form a three-component conjugate fiber by protecting the conjugate fiber with an extremely large alkali-soluble polyester. The conjugate fiber or a yarn or fabric produced using the conjugate fiber is alkali-treated to obtain an alkali-soluble polyester. It has been found that, by dissolving and removing, a good fiber or cloth excellent in humidity control and free from deformation or peeling of a bonded portion in a post-processing step is obtained.

That is, the present invention provides (A) a temperature of 20 ° C.
Polyamide having an equilibrium moisture content of 3.3% or more at a humidity of 65%; (B) a polyester obtained by copolymerizing 0.5 to 3 mol% of sulfoisophthalate; and (C) an alkali solubility constant of the polyester (B). A three-component conjugate fiber comprising a polyester which is 25 times or more, and a polyamide (A) and a polyester (B) in a fiber cross section, forming a bonded structure, wherein the three-component conjugate fiber, A method for producing a moisture-controlling fiber, yarn or fabric, comprising subjecting a resulting yarn or fabric to an alkali treatment to dissolve and remove the polyester (C). Further, the present invention includes a ternary composite fiber comprising the above-mentioned polyester (A), polyester (B) and polyester (C) before alkali treatment, and a yarn or fabric comprising the composite fiber.

There are various types of fiber-forming polymers having water absorption and hygroscopicity, but they have a swelling property when absorbing moisture, and the fiber diameter varies depending on the degree of humidity in the environment where the polymer is used. The polyamide is preferably a hygroscopic polyamide in that the release of moisture can be controlled by changing the water content. In the present invention, among such polyamides, the equilibrium moisture content at a temperature of 20 ° C. and a humidity of 65% is 3.3%. The above polyamide (hereinafter, referred to as “polyamide (A)”) is used as one component of the three-component composite fiber. When this polyamide (A) is used, the moisture absorption of the conjugate fiber obtained by the present invention becomes high, and it becomes impossible to obtain clothes that provide comfortable wearing comfort.
As the polyamide (A), those having an equilibrium moisture content of 6% or more are more preferably used. The “equilibrium moisture content at a temperature of 20 ° C. and a humidity of 65%” in the present invention refers to a value obtained as follows.

The equilibrium moisture content at a temperature of 20 ° C. and a humidity of 65% :
A tubular knitted fabric was prepared, scoured, relaxed, and preset by a conventional method as a sample. A sample weighed (G ₀ ) after vacuum drying at a temperature of 20 ° C. for 10 hours or more was subjected to a temperature of 20 ° C. and a humidity of 65% for 10 hours. The humidity was adjusted as described above, reweighed (G), and determined by the following equation (iii).

[0010]

## EQU2 ## Equilibrium water content (%) = {(G / G ₀ ) -1} × 100 (iii)

In the present invention, the above polyamide (A) has an equilibrium moisture content of 3.3% at a temperature of 20 ° C. and a humidity of 65%.
Any of the above fiber-forming polyamides can be used without any particular limitation. Examples of such hygroscopic polyamides include nylon 6, nylon 66, nylon 12,
Based on a polyamide consisting of a homo- or copolymer such as Nylon 46, and additionally peonic acid, piperazine,
Polyethers, polyamines, those containing at least one of hygroscopic groups and segments such as sulfonic acid groups as copolymerized units, polyether in the above nylon,
Examples thereof include those into which a hygroscopic substance such as polyamine or sulfonate is kneaded. In the case where the equilibrium moisture content is adjusted to 3.3% or more by copolymerizing polyamide with polyether or other hygroscopic component, the hygroscopic copolymer component may be introduced into the main chain or added to the side chain. It may be introduced, and especially those introduced into the side chain have higher hygroscopicity.

Also, as a highly hygroscopic polyamide, for example, nylon 4 which can be produced by a method described in US Pat. No. 4,281,105 is known. Nylon 4 has an equilibrium moisture content at a temperature of 20 ° C. and a humidity of 65% of 8.5 to 9%, which is higher than that of cotton at 7 to 8%. Nylon 4 can also be used. Further, although not limited, the polyamide (A) has an intrinsic viscosity of 0.1.
It is preferable to use those having a viscosity of 8 to 1.4 in view of spinnability.

In the present invention, the above-mentioned polyamide
It is necessary to combine (A) with a hydrophobic polyester in a bonding structure, and it is more preferable to combine the polyamide (A) and the hydrophobic polyester in a flat two-layer bonding structure. The above-mentioned polyamide (A) is combined with a hydrophobic polyester in a bonding structure, so that the polyamide (A) obtained after dissolving and removing the alkali-soluble polyester from the above-mentioned 3-pickup composite fiber and the hydrophobic polyester. It is possible to reversibly change the fiber diameter of the conjugate fiber according to the amount of moisture absorption, and it is possible to effectively suppress, for example, the feeling of discomfort and chills when used in clothes.
Specifically, for example, when the humidity in the clothes increases due to sweating, the fiber diameter increases while the moisture released by the conjugate fiber is released to the outside, and the moisture release area is enlarged to increase the moisture release area. To the outside, and as a result, the sense of discomfort is suppressed. On the other hand, when the humidity in the clothes decreases due to the stoppage of sweating, etc., the fibers gradually release the moisture absorbed by the fibers and reduce the fiber diameter. In addition, the release of moisture is suppressed, and as a result, body heat is not deprived by latent heat during vaporization, and chills can be prevented.

The composite fiber of the polyamide (A) and the hydrophobic polyester does not lose its performance even after a number of repetitions of moisture absorption / evaporation, and its fiber diameter is reversibly reduced / increased over a long period of time. In order to obtain, it is necessary that the bonding surface between the polyamide (A) and the hydrophobic polyester does not peel off, and that both can maintain a strong bonding structure. For this reason, in the present invention, the polyamide (A) It is necessary to use the above-mentioned polyester (hereinafter, referred to as “polyester (B)”) having a high affinity for polyamide and having 0.5 to 3 mol% of a sulfoisophthalate copolymerized as the hydrophobic polyester to be bonded to the polyamide. is there.

If the copolymerization ratio of the sulfoisophthalate in the polyester (B) is less than 0.5 mol%, peeling at the bonding portion with the polyamide (A) is liable to occur, resulting in spinnability and subsequent processing. The handleability in the process is reduced, and the above-mentioned good reversible humidity control performance cannot be imparted to the fiber. On the other hand, when the copolymerization ratio of the sulfoisophthalate in the polyester (B) exceeds 3 mol%, the viscosity of the polymer becomes too high, and spinning becomes difficult. polyester
The copolymerization ratio of the sulfoisophthalate in (B) is 1.5 to
More preferably, it is 2.5 mol%.

As the polyester (B), an acid component mainly composed of terephthalic acid or an ester-forming derivative thereof (preferably an acid component in which the proportion of terephthalic acid or an ester-forming derivative thereof is 80 mol% or more) and at least one And glycol glycols such as ethylene glycol, trimethylene glycol, tetramethylene glycol, etc., and preferably one or more alkylene glycols (more preferably, a glycol component in which the proportion of ethylene glycol is at least 80 mol%). It is preferable to use a polyester in which a sulfoisophthalate is copolymerized in an amount of 0.5 to 3 mol%, and in particular, a polyethylene terephthalate or a polybutylene terephthalate in which a sulfoisophthalate is copolymerized in an amount of 0.5 to 3 mol%. ,
Alternatively, those obtained by copolymerizing other components such as neopentyl glycol, cyclohexanedimethanol, isophthalic acid, and sulfoisophthalic acid in an amount of 10 mol% or less are preferable. However, the polyester (B) is not limited to the above, and the sulfoisophthalate may be used in an amount of 0.5%.
Any of the fiber-forming polyesters copolymerized at ３3 mol% can be used.

Examples of the sulfoisophthalate to be copolymerized into the polyester (B) include isophthalic acid having a sulfonic acid metal base such as 5-sodium sulfoisophthalic acid, 5-potassium sulfoisophthalic acid, and 5-lithium sulfoisophthalic acid. Examples thereof include isophthalic acid having a sulfonic acid phosphonium base such as 5-tetrabutylphosphonium sulfoisophthalic acid and 5-ethyltributylphosphonium sulfoisophthalic acid. Only one of these sulfoisophthalates is contained in the polyester (B). May be copolymerized, or two or more of them may be copolymerized, and those obtained by copolymerizing 5-sodium sulfoisophthalic acid are particularly preferable.

The polyester (B) preferably has an intrinsic viscosity of 0.5 or more, particularly preferably 0.6 or more, in order to exhibit good fiber properties. Further, in order to make the polyester (B) sufficiently exhibit the function as a hydrophobic component, it is preferable to use a polyester (B) having an equilibrium moisture content of 2% or less at a temperature of 20 ° C. and a humidity of 65%. . In addition, polyester (B)
The production method is not particularly limited, and can be produced, for example, by a transesterification reaction and a subsequent polycondensation reaction, or a direct esterification reaction and a subsequent polycondensation reaction, in which case a copolymer component comprising a sulfoisophthalate salt is used. Can be added to the reaction system at any stage during the transesterification reaction, the direct esterification reaction or the polycondensation reaction.

In the present invention, the polyamide (A): polyester (B) composite is obtained in the ternary composite fiber and the composite fiber obtained by dissolving and removing the polyester (C) from the ternary composite fiber by alkali treatment. Preferably, the ratio is 40-80: 60-20 by weight. If the proportion of the polyamide (A) is less than the above, the hygroscopicity of the conjugate fiber obtained after dissolving and removing the polyester (C) is reduced, making it difficult to obtain the desired moisture-controlling fiber, while the polyamide (A) Is higher than the above,
Although the hygroscopicity is increased, the contribution of the high Young's modulus by the polyester is reduced, resulting in a fiber having a low Young's modulus, and it becomes easy to give a sticky feeling when wet. From the viewpoints of hygroscopicity and Young's modulus, it is more preferable that the composite ratio of polyamide (A): polyester (B) is 50 to 70:50 to 30 by weight.

In the present invention, the above-mentioned polyamide (A) and polyester are used as the fibers before the alkali treatment.
Polyester (B) further has an alkali solubility constant together with (B).
Use is made of a ternary composite fiber which is a composite of a polyester (C) which is at least 25 times as large as the above (hereinafter referred to as "alkali-soluble polyester (C)"). Alkali-soluble polyester (C)
When the alkali solubility constant of the polyester (B) is 25 times or more, when the ternary composite fiber is alkali-treated, only the alkali-soluble polyester (C) is selectively dissolved and removed, and the polyester (B) and The polyamide (A) is not attacked or dissolved by the alkali, and the polyamide (A) and the polyester (B) having good fiber properties are maintained without peeling of the polyamide (A) and the polyester (B). ) Can be obtained. On the other hand, if the alkali solubility constant of the alkali-soluble polyester (C) is less than 25 times that of the polyester (B), the ternary composite fiber is alkali-treated to dissolve and remove the alkali-soluble polyester (C). When the polyester
The erosion and dissolution of (B) also proceed at the same time, and the physical properties of the finally obtained composite fiber of the polyamide (A) and the polyester (B) are reduced, and both are separated. In addition, the alkali solubility constant (k) in the present invention is obtained by the following equation (iv).

[0021]

(3) k = (10−R ^1/2 ) × {r ₀ / (10t)} (where, k = alkali solubility constant (cm / sec) R = immersion t in alkaline liquid) Weight% of insoluble matter after seconds r ₀ = radius of fiber immediately after immersion in alkali solution (t = 0) (cm) t = alkali immersion time (sec) where r ₀ is (dr / π · f · ρ · 9000) ^1/2 , where dr = denier of the yarn, ρ = specific gravity (=
1.388), f = number of filaments in the yarn]

The ratio of the alkali solubility constant between the polyester (B) and the alkali-soluble polyester (C) is such that the polyester (B) and the alkali-soluble polyester (C) are each used alone and a 75 d / 24f filament is used. Yarn is manufactured by spinning and drawing, and it is made into a tubular knitted fabric.
After heat treatment for 1 minute at a temperature of 98 ° C., an alkali weight loss treatment was performed at a liquid temperature of 98 ° C. using a 2% aqueous solution of sodium hydroxide, and the alkali solubility constant of each filament yarn was determined by the above equation (iv). This is performed by determining the ratio of the solubility constants.

The composite structure of the polyamide (A), the polyester (B) and the alkali-soluble polyester (C) in the three-component conjugate fiber is such that the alkali-soluble polyester (C) is dissolved and removed by an alkali treatment, and then the polyamide (A) is dissolved. ) And the polyester (B) are not particularly limited as long as the composite fiber obtained by laminating the polyester (B) and the polyester (B) are bonded to each other. In order for the polyamide (A) and the polyester (B) to have
Preferably, the composite structure is such that a composite fiber bonded in a total of two layers is obtained. Such a composite structure is more preferably a bent or unbent flat bonded structure. preferable.

In the ternary composite fiber, the alkali-soluble polyester (C) partially or entirely surrounds or contacts such a bonding structure portion composed of the polyamide (A) and the polyester (B). It is preferred that the polyamide (A) and the polyester (B) be mixed during spinning or drawing of the ternary conjugate fiber, and during processing steps such as crimping, entanglement, knitting and weaving, and dyeing. )) Is protected by the alkali-soluble polyester (C) so as not to cause troubles such as remarkable deformation or damage of the composite portion consisting of the two components and peeling between both polymers. In addition, since the alkali-soluble polyester (C) is a component that is finally removed by the alkali treatment, at least one of the surfaces of the three-component conjugate fiber is used so that the alkali-soluble polyester (C) can be easily removed from the alkali. Alkali-soluble polyester in part
(C) must be exposed, and about 2 to 40% of the surface of the ternary composite fiber is an alkali-soluble polyester.
It is desirable to form it by (C).

Also, although not limited, the polyamide (A) + polyester in the ternary composite fiber
(B)｝: The compounding ratio of the alkali-soluble polyester (C) should be about 40 to 80:60 to 20 by weight, for example, processability during spinning, ease of alkali treatment, form stability, etc. It is preferable from the point of view.

A polyamide (A) in a ternary composite fiber,
Polyester (B) and alkali-soluble polyester
When the preferred composite form of (C) is shown in a cross-sectional view of the fiber, for example, those shown in FIGS. 1 to 3, (a) shows a ternary composite fiber before alkali treatment, and (b) shows a polyamide (A) obtained after dissolving and removing an alkali-soluble polyester (C) by alkali treatment. A shows a composite fiber with polyester (B), A shows polyamide (A), B shows polyester (B) and C shows alkali-soluble polyester (C). However, the composite form of each polymer in the three-component composite fiber is not limited to those shown in FIGS.
Any material may be used as long as a conjugate fiber having a bonding structure of (A) and polyester (B) can be obtained.

And an alkali-soluble polyester (C)
The alkali solubility constant of the polyester (B)
Any polyester can be used as long as it is at least 25 times the polyester.
Although not particularly limited, the alkali dissolution is advantageous in that it is fiber-forming and has extremely high alkali solubility, and the alkali treatment can be carried out quickly and smoothly without causing erosion or embrittlement of the polyester (B). Polyester
As (C): (a) the following formula (I);

[0028]

Embedded image (In the formula, Ar represents a trivalent aromatic group, and M represents a metal atom.)
(B) a dicarboxylic acid unit partially containing a dicarboxylic acid unit represented by the following formula (II):

[0029]

A diol unit represented by —O— (R ¹ —O) _m — (II) (wherein R ¹ represents an alkylene group and m represents a number of 10 to 100); and (c) Formula (III) of

[0030]

Embedded image (Wherein, R ² is an alkylene group, R ³ is a hydrocarbon group having 1 to 18 carbon atoms, n is a number of 10 to 100, and x and y each represent 0 or 1); Wherein the dicarboxylic acid unit represented by the formula (I) comprises 0.5 to 10 mol% of the total acid components constituting the copolymerized polyester, and the diol unit represented by the formula (II) And 1 to 49% by weight of the side chain unit represented by the formula (III) based on the weight of the copolymerized polyester, and
Copolymer polyester having a total content of the diol unit represented by formula (II) and the side chain unit represented by formula (III) of 2 to 50% by weight based on the weight of the copolymer polyester [hereinafter referred to as “copolymer” Polyester (C) "] can be mentioned as a preferred example of the alkali-soluble polyester (C).

In the copolymerized polyester (C), the dicarboxylic acid unit constituting the copolymerized polyester (C) is a dicarboxylic acid unit represented by the above formula (I) [hereinafter referred to as “dicarboxylic acid unit”.
(I) "] in an amount of preferably 0.5 to 10 mol%, more preferably 1 to 7 mol%, of all the acid components constituting the copolymerized polyester (C). Dicarboxylic acid unit
If the copolymerization ratio of (I) is less than 0.5 mol%, the copolymerized polyester (C) becomes difficult to dissolve during alkali treatment, while if it exceeds 10 mol%, the ionic interaction of the metal sulfonate component results. During the polycondensation reaction for producing the copolymerized polyester (C), viscosity increases, and it becomes difficult to continue the polycondensation reaction until the copolymerized polyester (C) has a desired intrinsic viscosity.

In the dicarboxylic acid unit (I), Ar is a trivalent aromatic group, M is a metal atom, and the group Ar is a 1,3,5-benzenetriyl group, 1,2,3 −
Benzenetriyl group, benzenetriyl group such as 1,2,4-benzenetriyl group, 1,3,6-naphthalenetriyl group, 1,3,7-naphthalenetriyl group, 1,
Examples thereof include naphthalenetriyl groups such as 4,5-naphthalenetriyl group and 1,4,6-naphthalenetriyl group, and the metal atom M is sodium, potassium,
It is preferably an alkali metal atom such as lithium.
The copolymerized polyester (C) has one type of dicarboxylic acid unit.
It may have only (I) or two or more dicarboxylic acid units (I).

The carboxylic acid units other than the dicarboxylic acid unit (I) constituting the copolymerized polyester (C) include terephthalic acid, isophthalic acid, 1,4-naphthalenedicarboxylic acid, 1,5-naphthalenedicarboxylic acid, 5-naphthalenedicarboxylic acid, 2,6-naphthalenedicarboxylic acid,
4,4′-biphenyldicarboxylic acid, 3,3′-biphenyldicarboxylic acid, 4,4′-diphenyletherdicarboxylic acid, 4,4′-diphenylmethanedicarboxylic acid,
4,4′-diphenylisopropylidene dicarboxylic acid,
Aromatic dicarboxylic acids such as 1,2-diphenoxyethane-4 ′, 4 ″ -dicarboxylic acid, 2,5-anthracenedicarboxylic acid, 2,6-anthracenedicarboxylic acid, and 2,5-pyridinedicarboxylic acid; β-hydroxy Aromatic hydroxycarboxylic acids such as ethoxybenzoic acid and p-oxybenzoic acid; or aromatic dicarboxylic acid units derived from their ester-forming derivatives,
These aromatic dicarboxylic acid units have only one kind or two or more.
More than one species may be included.

Along with the aromatic dicarboxylic acid unit described above,
Aliphatic dicarboxylic acids such as adipic acid, azelaic acid and sebacic acid; may contain units derived from an alicyclic dicarboxylic acid such as cyclohexanedicarboxylic acid or an ester-forming derivative thereof, but may contain a copolymer polyester (C)
It is preferable that 70 mol% or more of all the acid component units constituting the above-mentioned compound be composed of aromatic dicarboxylic acid units, especially terephthalic acid units.

The copolymerized polyester (C) has the above formula
The diol unit represented by (II) [hereinafter referred to as “diol unit (I
"I)"] is preferably 1 to 49% by weight based on the weight of the copolymerized polyester (C), and if the proportion of the diol unit (II) is less than 1% by weight, Alkali solubility of (C) is reduced, while 49% by weight
If it exceeds, spinning becomes difficult.

In the diol unit (II), R ¹ is preferably an alkylene group having 1 to 4 carbon atoms, more preferably an ethylene group or a propylene group, and R ¹ is an ethylene group. It is particularly preferable in terms of properties and the like. In the diol unit (II), an ethylene group and a propylene group may be present in the same molecule. In the diol unit (II), m indicating the degree of polymerization of the oxyalkylene unit is a number in the range of 10 to 100 as described above, and it is preferable that m is a number in the range of 20 to 80.
In the diol unit (II), if m is less than 10, the alkali solubility decreases, while if m exceeds 100, the alkali solubility does not improve much, but rather tends to be colored. Examples of the diol unit (II) include units derived from polyoxyethylene glycol, polyoxypropylene glycol, polyoxyethylene / polyoxypropylene glycol or the like in which m is within the above range of 10 to 100. , Copolymerized polyester (C)
In the above, only one kind or two or more kinds of diol units (II) may be contained.

The copolymerized polyester (C) preferably further has another diol unit other than the above-mentioned diol unit (II). Examples of the other diol unit include ethylene glycol, propylene glycol and Trimethylene glycol, tetramethylene glycol, pentamethylene glycol, hexamethylene glycol, nonamethylene glycol, 3-methylpentane-1,5-diol,
Examples thereof include units derived from aliphatic diols such as 2-methyloctane-1,8-diol and diethylene glycol; and alicyclic diols such as cyclohexane dimethanol. These diol units contain only one type. Or two or more types may be included. From the viewpoint of fiber-forming properties when producing a conjugate fiber, 70 mol% or more of the other diol unit is composed of 2 carbon atoms such as ethylene glycol, trimethylene glycol, tetramethylene glycol, pentamethylene glycol and hexamethylene glycol. It is preferably a unit derived from a linear alkylene glycol of from 6 to 6.

The copolymerized polyester (C) further comprises a side chain unit represented by the above formula (III) [hereinafter referred to as "side chain unit (II
"I)"] is preferably 1 to 49% by weight based on the weight of the copolymerized polyester (C).
When the proportion of II) is less than 1% by weight, the alkali solubility decreases, while when it exceeds 49% by weight, spinning becomes difficult.

The side chain unit (III) is, for example, represented by the following formula (I
V);

[0040]

Embedded image [In the formula, D is a group capable of reacting with a dicarboxylic acid component or a diol to introduce the side chain unit (III) represented by the above formula (III) into the main chain of the copolymerized polyester (C). Wherein R ² , R ³ and n represent the same groups and numbers as described above], which are introduced into the copolyester (C) by reacting the compound during the production of the copolyester (C). Can be.

In the compound represented by the above formula (IV),
Examples of ester-forming groups D include, for example, the following formulas:

[0042]

Embedded image Or a glycidyl group represented by the following formula:

[0043]

Embedded image 2,3-dihydroxypropyl group and the like.

In the side chain unit (III), R ² has 1 to 1 carbon atoms.
It is preferably an alkylene group of 4, more preferably an ethylene group or a propylene group, and particularly preferably an ethylene group. Specific examples of R ³ include methyl, ethyl, n-propyl, isopropyl, n-butyl, and se.
alkyl groups such as c-butyl, tert-butyl, n-pentyl, n-octyl, 2-ethylhexyl, n-dodecyl and n-stearyl; cycloalkyl groups having 3 to 18 carbon atoms such as cyclohexyl; phenyl, nonylphenyl and the like And an aryl group having 6 to 18 carbon atoms.

In the side chain unit (III), an ethylene group and a propylene group may be present in the same molecule. In addition, the side chain unit (I
In II), n indicating the degree of polymerization of the oxyalkylene unit is a number in the range of 10 to 100 as described above, and n is preferably a number in the range of 20 to 80. n
Is less than 10, the alkali solubility decreases, while 1
If it exceeds 00, the alkali solubility does not improve so much and causes coloring.

Specific examples of the side chain unit (III) include polyoxyethylene glycol-methyl-glycidyl ether and polyoxyethylene glycol-methyl-2,3-
Dihydroxypropyl ether, polyoxyethylene glycol-ethyl-glycidyl ether, polyoxyethylene glycol-ethyl-2,3-dihydroxypropyl ether, polyoxyethylene glycol-n-propyl-glycidyl ether, polyoxyethylene glycol-n-propyl- 2,3-dihydroxypropyl ether, polyoxyethylene glycol-t-butyl-glycidyl ether, polyoxyethylene glycol-t-butyl-2,3-dihydroxypropyl ether, polyoxyethylene glycol-n-octyl-glycidyl ether, poly Oxyethylene glycol-n
-Octyl-2,3-dihydroxypropyl ether,
Polyoxyethylene glycol-2-ethylhexyl-
Glycidyl ether, polyoxyethylene glycol-
2-ethylhexyl-2,3-dihydroxypropyl ether, polyoxyethylene glycol-n-dodecyl-glycidyl ether, polyoxyethylene glycol-n-dodecyl-2,3-dihydroxypropyl ether, polyoxyethylene glycol-n-stearyl-
Glycidyl ether, polyoxyethylene glycol-
n-stearyl-2,3-dihydroxypropyl ether, polyoxyethylene glycol-phenyl-glycidyl ether, polyoxyethylene glycol-phenyl-2,3-dihydroxypropyl ether, polyoxyethylene glycol-nonylphenyl-glycidyl ether, polyoxy Ethylene glycol-nonylphenyl-2,3-dihydroxypropyl ether, polyoxyethylene glycol-cyclohexyl-glycidyl ether, polyoxyethylene glycol-cyclohexyl-2,3-dihydroxypropyl ether, polyoxyethylene / polyoxypropylene glycol copolymer Methyl glycidyl ether of the polyoxyethylene / polyoxypropylene glycol copolymer methyl-2,
3-dihydroxypropyl ether, n-propyl-glycidyl ether of polyoxyethylene / polyoxypropylene glycol copolymer, n-propyl-2,3-dihydroxypropyl ether of polyoxyethylene / polyoxypropylene glycol copolymer, etc. Derived units can be mentioned, and these units may be contained alone or in combination of two or more in the copolymerized polyester (C).

In the copolymer polyester (C), the total content of the diol unit (II) and the side chain unit (III) is 2 to 50 based on the weight of the copolymer polyester (C).
%, More preferably 5 to 30% by weight. When the total content of the diol unit (II) and the side chain unit (III) is less than 2% by weight, alkali solubility decreases, while when it exceeds 50% by weight, spinning becomes difficult.

In addition to the above-mentioned units, the copolymerized polyester (C) includes, for example, triols such as glycerin and trimethylolpropane; tetraols such as pentaerythritol; tricarboxylic acids such as trimellitic acid and trimesic acid; A small amount of copolymerized units derived from a polyfunctional component such as a tetracarboxylic acid or a polycarboxylic acid such as a tetracarboxylic acid such as an acid may be contained within a range where melt spinning or melt molding of the polyester is possible.

The copolymerized polyester (C) is mixed with an equal weight mixture of phenol and tetrachloroethane in a solvent of 30%.
The intrinsic viscosity measured at 0 ° C is 0.5 dl / g or more, preferably 0.55 to 1.5 dl / g, particularly 0.6 to 1.0 dl.
/ G is preferred from the viewpoint of processability during spinning and the like.

The copolyester (C) is a dicarboxylic acid component or a diol component capable of introducing each of the above-mentioned units into the copolyester (C), and is used for the side chain unit (III) represented by the above formula (IV). It can be produced by conducting a polymerization reaction by a conventional method using a compound or the like. For example, in the first step, first, using those raw material components, an esterification reaction or a transesterification reaction is performed to generate a low polymer, and then, in the second step, the low polymer is reduced under reduced pressure in the presence of a polymerization catalyst. It can be produced by heating to polycondensate until the desired degree of polymerization is reached, but of course the method is not limited to this method. At that time, in the esterification reaction or transesterification reaction step before the polycondensation reaction, known esterification catalysts and transesterification catalysts used in the production of polyester can be used as necessary.

The ternary composite fiber comprising the polyamide (A), the polyester (B) and the alkali-soluble polyester (C) has a circular cross-section; , V-shape, flat shape, square shape, and other arbitrary cross-sectional shapes, and not only solid fibers but also hollow fibers or porous fibers. Among them,
In order to prevent damage to the composite fiber of the polyamide (A) and the polyester (B) obtained after the alkali treatment and peeling off at the bonding surface, crossing with a small degree of deformation such as a circle, an ellipse, and a square is performed. It is preferable to have a planar shape. The thickness of the three-component composite fiber is not particularly limited and may be any thickness. It is preferable that the single fiber fineness of the fiber composite is about 1.5 to 5.0 denier.

In the three-component composite fiber, polyamide
One or two or more of (A), polyester (B) and alkali-soluble polyester (C) may be used, if necessary, with antioxidants, anti-colorants, and heat resistance commonly used for such fibers. It may contain an improver, a fluorescent bleach, a flame retardant, a matting agent, a coloring agent, inorganic fine particles, etc., and especially a phosphite-based antioxidant is blended in the copolymerized polyester (C) portion. When a hindered phenolic antioxidant is contained, oxidative decomposition of the polyoxyalkylene chain in the copolymerized polyester (C) is prevented.

The method for producing the three-component conjugate fiber is not particularly limited. For example, a method of drawing after melt-spinning at a low or medium speed, a direct spinning and drawing method at a high speed, and drawing or false twisting is performed simultaneously or successively after spinning. It can be produced by any spinning method such as a method.

In the present invention, the above-mentioned ternary composite fiber or a yarn or fabric produced using the ternary composite fiber is treated with alkali to dissolve the alkali-soluble polyester (C) portion of the ternary composite fiber. To obtain a composite fiber in which the polyamide (A) and the polyester (B) are combined in a bonded type. The alkali treatment may be applied directly to the ternary composite fiber or a yarn made thereof, or may be applied to a fabric produced from the ternary composite fiber or the yarn. The alkali treatment of the fabric is preferred from the viewpoint of easiness of treatment, physical properties and feeling of the obtained product, and the like. In that case, the fabric may be formed of the ternary composite fiber alone, or may be formed of a combination of the ternary composite fiber and a natural fiber or another synthetic fiber. For example, in the case of a woven fabric, both the warp yarn and the weft yarn may be made of a ternary composite fiber, or only one of them may be made of a ternary composite fiber. Further, the fabric may be formed from a filament of a ternary composite fiber, or may be formed from a short fiber, a spun yarn, a blended yarn, or the like.

In performing the alkali treatment, it is preferable to employ a more suitable alkali concentration and strength depending on the alkali solubility of the alkali-soluble polyester (C) constituting the three-component composite fiber. And the above-mentioned copolymerized polyester (C) as the alkali-soluble polyester (C)
When using the alkali treatment, a method using a treatment solution containing a strong alkaline substance alone, a method using a treatment solution containing a weak alkaline substance alone, or both a strong alkaline substance and a weak alkaline substance It may be carried out by any of the methods using the processing solution to be contained.

In the case of the above method, it is preferable to use sodium hydroxide, potassium hydroxide, trisodium phosphate or the like as the strongly alkaline substance, and the concentration of the strongly alkaline substance in the treatment solution is about 2 to 40 g / liter. And preferably about 5 to 20 g / liter. In the case of this method, when the concentration of the strongly alkaline substance is lower than 2 g / liter, the dissolution rate and the degree of dissolution of the copolyester (C) portion in the conjugate fiber become small,
It becomes difficult to perform the alkali reduction treatment in a short time. On the other hand, when the concentration of the strongly alkaline substance is higher than 40 g / liter, the polyester (B) is deteriorated, and the strength of the fiber, yarn or fabric is greatly reduced.

Further, in the case of the above method, sodium carbonate, sodium bicarbonate,
It is preferable to use sodium silicate, sodium dihydrogen phosphate, or the like, and the concentration of the weakly alkaline substance in the treatment solution is about 5 to 100 g / liter, preferably 5 to 6 g / liter.
It is better to keep it at about 0 g / liter. In the case of this method, if the concentration of the weak alkaline substance is lower than 5 g / liter, the dissolution rate and the degree of dissolution of the copolyester (C) portion in the conjugate fiber become small, and the alkali weight reduction treatment is performed in a short time. On the other hand, when the concentration of the weakly alkaline substance is higher than 100 g / liter, the deterioration of the polyester (B) is caused as in the above case, and the strength of the fiber, yarn or fabric is greatly reduced. It will be easier.

Further, in the case of the above-mentioned method, it is preferable that a strong alkaline substance and a weak alkaline substance are contained in the treatment liquid in a ratio satisfying the following formulas (v) and (vi).

[0059]

S <−0.8 W + 15 (v) 2 ≦ W <5 (vi) [where S = concentration of strong alkaline substance (g / liter) W = concentration of weak alkaline substance (g / liter)]

In the case of using the above-mentioned method in which a strongly alkaline substance and a weakly alkaline substance are used together, by using both alkaline substances so as to satisfy the above formulas (v) and (vi), the concentration of the strongly alkaline substance can be improved. Is small, only the alkali-soluble polyester (C) can be efficiently dissolved and removed, and the polyester (B) portion can be left without being dissolved. In the case of this method, when the concentration of the weak alkaline substance is less than 2 g / liter, it is necessary to make the concentration of the strong alkaline substance higher than the above formula, and the alkali erosion of the polyester (B) becomes large. As a result, it is difficult to obtain a soft hand similar to natural fibers, and further, the polyester (B) is deteriorated, and the strength of the fiber, yarn or fabric is reduced. Further, the concentration of the strong alkaline substance is -0.8.
If W + 15 (g / liter) or more, not only the alkali-soluble polyester (C) portion but also the polyester (B) portion is dissolved, and the fiber strength is significantly reduced.

In any of the above-mentioned methods, the alkali treatment is preferably performed at a temperature of 75 to 130 ° C.
It is more preferable to carry out at a temperature of 0 to 120 ° C. Temperature 7
If the temperature is lower than 5 ° C., it takes a long time for the alkali weight reduction treatment. On the other hand, if the temperature exceeds 130 ° C., not only the alkali-soluble polyester (C) but also the polyester (B) is eroded.
Deterioration is likely to occur.

The alkali treatment of the present invention can be used for scouring fabrics, etc.
It may be performed at the same time as desizing or print finishing, or before or after them, but when performed at the same time as scouring, desizing or print finishing, the number of processing steps can be reduced. Further, the alkali treatment may be performed in a static state or a dynamic state. In particular, the alkali treatment liquid may be caused to collide with a fiber, a yarn, a cloth, or the like, or the alkali treatment liquid or the fiber or cloth to be treated may be stirred. In the case of adopting a dynamic state, the alkali-soluble polyester (C) in the ternary composite fiber can be dissolved and removed more quickly. It can be carried out using a washer device or the like.

It is preferable to carry out the alkali treatment in the presence of a nonionic surfactant, an anionic surfactant or the like, thereby promoting swelling and softening of the composite fiber, penetration of alkali into the composite fiber, and the like. As a result, it is possible to carry out the treatment promptly, to give a good swelling feeling to the entire fiber, and to prevent the adhesive agent or the like which has fallen off from the fiber or the fabric from being reattached. As the nonionic surfactant at that time, for example, polyoxyethylene polyhydric alcohol alkyl esters, polyoxyethylene alkyl ether, polyethylene glycol alkyl esters and the like, and as the anionic surfactant, soap,
Higher alcohol surfactants and the like can be mentioned. When the alkali treatment temperature is 100 ° C. or higher, a polyethylene glycol / polypropylene oxide adduct-based surfactant is preferred from the viewpoint of foaming properties.

In the present invention, a ternary composite fiber composed of polyamide (A), polyester (B) and alkali-soluble polyester (C), a yarn using at least a part of the fiber, By treating the resulting fabric with alkali as described above, the fiber diameter changes reversibly depending on the humidity of the surrounding environment in which it is used, and its moisture absorption and release of moisture are reversibly and extremely suitable. A composite fiber having a bonding structure of the polyamide (A) and the polyester (B) can be obtained. The moisture-controlling conjugate fiber, or the yarn and fabric obtained therefrom, have excellent softening feeling, surface condition and appearance, as well as excellent moisture-controlling ability comparable to that of natural fiber, and particularly, alkali-soluble polyester (C The above-mentioned copolymerized polyester (C)
In the case where is used, the alkali treatment can be efficiently performed in a very short time as compared with the conventional alkali treatment technique of this kind.

Further, at this time, the bonded conjugate fiber of the polyamide (A) and the polyester (B) obtained by the alkali treatment has the following formulas (i) and (ii):

[0066]

1.1 ≦ L ₁₀₀ / L ₆₅ ≦ 2.5 (i) 0.5 ≦ L ₀ / L ₆₅ ≦ 0.9 (ii) (where L ₀ = temperature The length of a predetermined portion of the cross section of the conjugate fiber after vacuum drying at 20 ° C. for 10 hours or more, L ₆₅ = temperature 20
° C., the length of L ₀ corresponding portion when the left was more than 10 hours in an atmosphere of 65% humidity, and L ₀ length of corresponding portions when standing was more than 10 hours under saturated vapor pressure of the L ₁₀₀ = temperature 20 ° C. In particular, when the types of the polyamide (A) and the polyester (B) and the shape and dimensions (thickness, width, etc.) of the bonded structure are selected so as to satisfy the above, the above-mentioned reversible humidity control is performed. Alkali treatment was carried out using a ternary composite fiber comprising the above-mentioned polyamide (A), polyester (B) and polyester (C), which can obtain a more excellent composite fiber and satisfies the requirements of the present invention. In such a case, an excellent moisture-controlling conjugate fiber that normally satisfies the above formulas (i) and (ii) can be obtained.

Here, the method of measuring the lengths of L ₀ , L ₆₅ and L ₁₀₀ will be described in detail with reference to FIG. 4 taking the composite fiber obtained in FIG. 1 (b) as an example. When the vacuum conjugate fiber obtained in (b) of FIG. 1 is vacuum-dried at a temperature of 20 ° C. for 10 hours or more, the amount of moisture absorbed becomes extremely small, and the polyamide (A) layer is placed inside (FIG. It has become strongly rounded state, as shown in b), to measure in the L ₀ such as its diameter at this time. When the conjugate fiber is allowed to stand for 10 hours or more in an atmosphere of a temperature of 20 ° C. and a humidity of 65%, the inner polyamide (A) layer absorbs moisture and expands, so that the state shown in FIG. At this time, the length of the portion corresponding to L ₀ in FIG. 4A is measured as L ₆₅ . Further, when the conjugate fiber was further allowed to stand at a saturated vapor pressure of 20 ° C. for 10 hours or more, the moisture absorption of the inner polyamide (A) layer became extremely large, and the polyamide (A) layer was elongated. 4), the length of the portion corresponding to L ₀ in FIG. 4A is measured as L ₁₀₀ . The same measurement can be performed for composite fibers other than those shown in FIG. 4, and L ₀ , L ₆₅ and L
_{All 100} measurements can be made using an optical microscope or the like.

Polyamide obtained by alkali treatment
In the laminated conjugate fiber of (A) and polyester (B), L
More preferably, ₁₀₀ / L ₆₅ is 1.3 to 2.2,
When L ₁₀₀ / L ₆₅ deviates from the above formula (i) and is smaller than 1.1, the degree of increase in the surface of the conjugate fiber during moisture absorption is small, and the moisture in the clothes which has increased drastically due to a large amount of sweat is smoothly discharged to the outside. If moisture cannot be released, and if L ₁₀₀ / L ₆₅ is greater than 2.5, peeling of the composite fiber at the bonding surface tends to occur. When L ₀ / L ₆₅ is smaller than 0.5, the fiber diameter is difficult to return to its original state even after dehumidification. On the other hand, when L ₀ / L ₆₅ is larger than 0.9, the fiber surface area during dehumidification is reduced. The amount of shrinkage is small, and it is difficult to sufficiently obtain heat retention in cold weather.

The fibers, yarns or fabrics obtained by the method of the present invention can be used for underwear which is required to have high moisture absorption and heat retention,
Very suitable for use in various textile products such as outer garments, sheets, towels, sports clothing and the like.

[0070]

EXAMPLES The present invention will be specifically described below with reference to examples, but the present invention is not limited thereto. In the examples described above, the intrinsic viscosity [η] (dl / g) of the polymer is a value measured at 30 ° C. using a mixed solvent of tetrachloroethane: phenol = 1: 1 (weight ratio). The d / f in the figure indicates denier / filament number.

Examples 1 to 7 (1) As polyamide (A), intrinsic viscosity [η] = 1.
Polyoxyethylenediamine (molecular weight: 2,000) was block-copolymerized to 20% by weight based on the weight of nylon 6 with 4 (dl / g) nylon 6 at a temperature of 20 ° C. and a humidity of 65.
A hygroscopic polyamide having an equilibrium moisture content in% of 8.5% was prepared. (2) As the polyester (B), polyethylene terephthalate (PET) having an intrinsic viscosity [η] = 0.68 (dl / g) prepared by copolymerizing sodium sulfoisophthalate at the ratio shown in Table 1 below was prepared. The alkali solubility constant of each polyester was as shown in Table 1 below.

(3) Alkali-soluble polyester (C)
Terephthalic acid containing 5-sodium sulfoisophthalic acid in the ratio (mol%) shown in Table 1 below and 5
A dicarboxylic acid mixture with sodium sulfoisophthalic acid and ethylene glycol were charged into an esterification reactor at a molar ratio of 1: 1.25, and the mixture was charged at 230 ° C. and 2.5 kg /
The esterification reaction was performed under a pressure of cm ² for 2 hours. Next, the obtained reaction product (low polymer) was transferred to a polycondensation apparatus which had been heated to 230 ° C. in advance, and polyethylene glycol having a molecular weight of 2,000 and the following formula (V):

[0073]

Embedded image Polyoxyethylene glycidyl ether represented by
It was added in the amount shown in Table 1 below, and was further added with 5% by weight of 1,3,5-tris (4-t based on the total amount of polyethylene glycol and polyoxyethylene glycidyl ether.
-Butyl-3-hydroxy-2,6-dimethylbenzyl) -1,3,5-triazine-2,4,6- (1H,
3H, 5H) -trione (American Cyanamid; Cyanox 1790) was added and the temperature was increased to 230.
The temperature was gradually raised from 0.1 ° C to 280 ° C over 45 minutes while the pressure was gradually reduced to 0.1 mmHg. At 280 ° C, the melt viscosity of the system was almost equal to the melt viscosity at 280 ° C of the intrinsic viscosity 0.7 dl / g of polyethylene terephthalate. The copolyester (C) obtained by continuing the polycondensation reaction until the time coincided was prepared. The alkali solubility constant of each copolymerized polyester (C) was as shown in Table 1.

(4) The port prepared in the above (1) to (3)
Liamide (A), polyester (B) and copolymerized polyester
Using tellurium (C) at the ratio (weight ratio) shown in Table 1,
After being subjected to melt composite spinning at 295 ° C., it is stretched, and FIG.
Of three-component composite fiber having the cross-sectional shape shown in Fig.
Thread (75d / 24f) was manufactured. (5) Using the composite filament yarn produced in (4) above
To make a knitted fabric, and the obtained knitted fabric is made of sodium hydroxide.
Using a 2% aqueous solution at a liquid temperature of 95 ° C for 8 minutes to reduce the weight,
After completely dissolving the polymerized polyester (C),
A laminated conjugate fiber shown in (b) was obtained. (6) L of the composite fiber obtained in (5) above₀, L₆₅You
And L₁₀₀Is measured, and L ₁₀₀/ L₆₅And L₀/ L₆₅of
The values were determined and are shown in Table 1.
Water at a temperature of 20 ° C and a humidity of 65%
The fractions were as shown in Table 1.

<< Comparative Examples 1 and 2 >> Except that nylon 6 (equilibrium moisture content at a temperature of 20 ° C. and a humidity of 65% of 2.4%) was used in place of the polyamide (A) used in Examples 1 to 7. Produces a three-component conjugate fiber in the same manner as in Examples 1 to 7, and performs an alkali treatment in the same manner as in the case of nylon 6 and polyester.
The composite fiber of (B) was manufactured and its physical properties were examined in the same manner. Table 1 shows the results.

<< Comparative Examples 3-4 >> As the alkali-soluble polyester (C), a polyester having an alkali solubility constant of polyester
(B) Tricomponent bicomponent fibers were produced in the same manner as in Examples 1 to 7, except that the copolymerized polyester shown in Table 1 was used, which was smaller than 25 times that of (B). A composite fiber of A) and polyester (B) was produced, and its physical properties were examined in the same manner. Table 1 shows the results.

<< Comparative Example 5 >> As shown in Table 1 below,
Polyamide without using alkali-soluble polyester (C)
A flat laminated composite fiber (75d / 24f) that was not curved was melt-spun and drawn from (A) and polyester (B), and the resulting composite fiber was false-twisted. When the equilibrium moisture content of the conjugate fiber at a temperature of 20 ° C. and a humidity of 65% was measured, it was as shown in Table 1.

[0078]

[Table 1]

From the results shown in Table 1 above, the fabric produced from the ternary composite fiber formed of the polyamide (A), the polyester (B) and the alkali-soluble polyester (C) satisfying the requirements of the present invention was subjected to an alkali treatment. Example 1
In the case of ７7, the equilibrium moisture content at a temperature of 20 ° C. and a humidity of 65% is high and excellent in hygroscopicity, and the values of L ₁₀₀ / L ₆₅ and L ₀ / L ₆₅ are respectively determined by the above formulas (i) and (i).
It can be seen that an excellent fabric which is included in the range of i), and whose fiber diameter and fiber surface area are reversibly changed depending on the amount of moisture, exhibits a good humidity control action. On the other hand, in the case of Comparative Examples 1 to 6 using a conjugate fiber or a fabric made of the conjugate fiber that does not satisfy one or more of the requirements of the present invention, the equilibrium at a temperature of 20 ° C. and a humidity of 65% is used. Low moisture content, poor moisture absorption, and L ₁₀₀ / L ₆₅
It can be seen that only fibers or fabrics having inferior reversible humidity control whose values of L ₀ / L ₆₅ are out of the ranges of the above formulas (i) and (ii) are obtained.

[0080]

According to the present invention, the fiber has a high hygroscopicity, and the fiber diameter and the fiber surface area are reversibly changed in response to the change in humidity. As the fiber rises, the fiber diameter increases and the moisture release area increases, effectively releasing the water remaining in the clothing,
On the other hand, when sweating stops and the humidity in the clothing begins to decrease, the fiber diameter becomes smaller, the moisture release area becomes smaller, and the cold caused by excessive diffusion of moisture is suppressed, and a clothing that is always comfortable to wear can be provided. Wet fibers, yarns and fabrics can be efficiently obtained with high productivity in a short alkali treatment time. Further, in the case of the present invention, since the bonded structure of the polyamide (A) and the polyester (B) is protected by an alkali-soluble polyester (C) having extremely high solubility in alkali, a three-component conjugate fiber is used. Since the processability during spinning and the processability during post-processing of the ternary composite fiber are good, and the alkali-soluble polyester (C) is rapidly dissolved by alkali, the polyamide (A) and polyester (B) Is not damaged by alkali or the composite surfaces of both are not peeled off, and a laminated composite fiber of polyamide (A) and polyester (B) having excellent fiber properties can be obtained.

[Brief description of the drawings]

FIG. 1 is a diagram showing an example of a cross-sectional structure of a ternary conjugate fiber of the present invention and a conjugate fiber obtained by treating the conjugate fiber with an alkali.

FIG. 2 is a diagram showing another example of the cross-sectional structure of the three-component conjugate fiber of the present invention and a conjugate fiber obtained by treating the conjugate fiber with an alkali.

FIG. 3 is a view showing still another example of the cross-sectional structure of the three-component conjugate fiber of the present invention and a conjugate fiber obtained by treating the conjugate fiber with an alkali.

FIG. 4 is a diagram showing a method for measuring L ₀ , L ₆₅ and L _{100 in} the present invention.

[Explanation of symbols]

 A Polyamide (A) B Polyester (B) C Alkali-soluble polyester (C)

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-4-289226 (JP, A) JP-A-5-51821 (JP, A) JP-A-5-25772 (JP, A) JP-A-58-58 98425 (JP, A) JP-A-6-248515 (JP, A) JP-A-6-173160 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) D06M 11/38 D01F 8 /14

Claims (6)

(57) [Claims] 1. A polyamide having an equilibrium water content of 3.3% or more at a temperature of 20 ° C. and a humidity of 65%; (B) a polyester obtained by copolymerizing 0.5 to 3 mol% of sulfoisophthalate; (C) Polyester with alkali solubility constant
(B) a three-component composite fiber in which the polyamide (A) and the polyester (B) form a bonded structure in a cross section of the fiber, which is 25 times or more the polyester, and a yarn composed of the three-component composite fiber or Humidity-controlling fibers characterized by dissolving and removing the polyester (C) by treating the fabric with alkali,
A method for producing a yarn or a fabric. 2. The composite ratio of polyamide (A): polyester (B) in the composite fiber is 40-80: 60-2 by weight.
2. The method according to claim 1, wherein the value is 0. 3. The method according to claim 1, wherein the composite fiber after the alkali treatment satisfies the following formulas (i) and (ii). 1.1 ≦ L ₁₀₀ / L ₆₅ ≦ 2.5 (i) 0.5 ≦ L ₀ / L ₆₅ ≦ 0.9 (ii) (where L ₀ = temperature The length of a predetermined portion of the cross section of the conjugate fiber after vacuum drying at 20 ° C. for 10 hours or more, L ₆₅ = temperature 20
° C., the length of L ₀ corresponding portion when the left was more than 10 hours in an atmosphere of 65% humidity, and L ₀ length of corresponding portions when standing was more than 10 hours under saturated vapor pressure of the L ₁₀₀ = temperature 20 ° C. Is) 4. A polyester (C) comprising: (a) a compound represented by the following formula (I): (In the formula, Ar represents a trivalent aromatic group, and M represents a metal atom.)
In the dicarboxylic acid unit partially containing dicarboxylic acid units represented; (b) the following formula (II); embedded image _{^{-O- (R 1 -O) m -}} (II) ( In the formula, R ¹ Is an alkylene group, and m is a number from 10 to 100); and (c) the following formula (III): (Wherein, R ² is an alkylene group, R ³ is a hydrocarbon group having 1 to 18 carbon atoms, n is a number of 10 to 100, and x and y each represent 0 or 1); Wherein the dicarboxylic acid unit represented by the formula (I) comprises 0.5 to 10 mol% of the total acid components constituting the copolymerized polyester, and the diol unit represented by the formula (II) And 1 to 49% by weight of the side chain unit represented by the formula (III) based on the weight of the copolymerized polyester, and
2. A copolymerized polyester in which the total content of the diol unit represented by (II) and the side chain unit represented by formula (III) is 2 to 50% by weight based on the weight of the copolymerized polyester. 4. The method according to any one of items 1 to 3. 5. A fiber, yarn or fabric produced by the method according to claim 1. 6. A polyamide having an equilibrium moisture content of 3.3% or more at a temperature of 20 ° C. and a humidity of 65%; (B) a polyester obtained by copolymerizing 0.5 to 3 mol% of sulfoisophthalate; (C) Polyester with alkali solubility constant
(B) a three-component composite fiber in which the polyamide (A) and the polyester (B) form a bonded structure in a cross section of the fiber, which is 25 times or more the polyester, and a yarn composed of the three-component composite fiber or Fabric.