JPH09217228A - Moisture absorbing fiber and its fiber structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a moisture absorbing fiber having durable and excellent moisture absorbing and releasing properties and soft hand feeling and useful for inner shirts, etc., by adhering a specific polymer to a polyester-based fiber containing a moisture absorbing ingredient. SOLUTION: In this moisture absorbing fiber, 1-20% owf of a polymer mainly comprising vinylcarboxylic acid and/or vinylsulfonic acid is adhered to a moisture absorbing polyester-based fiber. It is preferable to adhere the polymer to the fiber after bringing the fiber to a fiber structure such as a fabric, etc. Moisture absorbing properties of the polyester-based fiber is enhanced to an sufficient extent and washing durability of water absorbing properties is also enhanced.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hygroscopic fiber and a fiber structure, and more specifically, it is suitable for use in an inner shirt having a durable and excellent moisture absorptive and desorptive property and a soft texture. The present invention relates to a hygroscopic fiber and a fiber structure that can be manufactured.

[0002]

2. Description of the Related Art Synthetic fibers such as polyester and nylon are widely used for clothing and industrial applications because of their excellent physical and chemical properties. But,
On the other hand, since these synthetic fibers have low hygroscopicity, they have the drawback that they tend to get stuffy when worn and are easily charged.

As a countermeasure against such a drawback, conventionally, for example, JP-B-60-34979 discloses a method of graft-polymerizing acrylic acid or methacrylic acid onto synthetic fibers from the post-processed surface, and JP-A-2-84565. Japanese Patent Application Laid-Open No. 2-145772 proposes a method of imparting a hygroscopic substance such as cellulose fine powder or a specific polyamino acid resin to synthetic fibers.

Further, JP-B-53-46960 discloses a method in which a copolymer having a polyalkylene glycol segment is attached to a polyester fiber by dipping treatment, and JP-B-58-46589 discloses a radically polymerizable compound. A method has also been proposed in which a hydrophilic monomer is added and then polymerized on a polyester fiber. Further, in Japanese Patent Publication No. 62-7285, as a method for improving the yarn surface, a method in which a specific oxalate is blended before spinning and a part thereof is eluted in the step after spinning to form capillary condensation holes. JP-A-60-155770 proposes a method of imparting hygroscopicity by treating a polyester fiber containing a metal sulfonate compound with an alkali to form capillary condensation pores.

[0005]

However, in any of the above-mentioned conventional methods, the durability of the moisture absorption performance is not sufficient in any of the methods, and moreover, the texture of the fiber or the fiber structure such as the woven or knitted fabric becomes coarse and hard. There was a drawback that it would end up. An object of the present invention is to provide a hygroscopic fiber and a fibrous structure which have excellent moisture absorption and desorption properties that are durable and which can exhibit a soft texture.

[0006]

Means for Solving the Problems The hygroscopic fiber of the present invention which achieves the above-mentioned objects, comprises a polyester-based fiber having hygroscopicity and having 1 to 20 polymers containing vinylcarboxylic acid and / or vinylsulfonic acid as a main component. % Owf is added. It is also characterized by a fiber structure made of such hygroscopic fibers. Here, the fiber structure mainly refers to a woven or knitted fabric, a non-woven fabric or the like.

In the present invention, the hygroscopic fiber or the polyester fiber having hygroscopicity in the fiber structure is copolymerized with a hydrophilic compound and a polar group-containing compound and / or a crosslinking agent. Composite fibers or blends containing 5% by weight or more of polyester, or composite fibers or blends containing 5% by weight or more of a mixture of polyetheresteramide or polyetheresteramide and another thermoplastic resin. Those configured as fibers are preferably used.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION In the present invention, a polyester fiber having a hygroscopic property means a polyester fiber having an official moisture content higher than 0.4% of the official moisture content of polyester specified in JIS L 0105. Say. Specifically, it is not particularly limited as long as it is a polyester containing a component having a hygroscopic property, but it will be described below in consideration of yarn-forming property, weaving property, dyeing property, durability of yarn performance, and the like. It is preferred to use such fibers.

In the present invention, one of the preferable examples of the hygroscopic polyester fiber is the hydrophilic compound (A).
A copolymerized polyester obtained by copolymerizing the above, wherein the copolymerized polyester (D) contains at least one of the polar group-containing compound (B) and the crosslinking agent (C).
Is a composite fiber or a blend fiber containing 5% by weight or more.

Another preferred example of the hygroscopic polyester fiber comprises 5% by weight or more of a polyether ester amide (E) or a mixture of a polyether ester amide and another thermoplastic resin (F). It is a composite fiber or a blended fiber. Of the hygroscopic polymers constituting the hygroscopic polyester fibers of the above two examples, the case of the first copolyester (D) will be described.

The molecular weight of the hydrophilic compound (A) as a copolymerization component of the copolyester (D) is 600 to 20,000, more preferably 2000 to 6000 from the viewpoint of compatibility with the polyester and dispersibility in the polyester. It is preferable. The hydrophilic compound (A) is not particularly limited as long as it is a compound containing one or more ester-forming groups, but typical compounds include polyoxyalkylene compounds, polyoxazolines, polyacrylamide and derivatives thereof. And so on. Among them, polyoxyalkylene compounds, and further polyoxyethylene compounds are preferable.

Further, among the polyoxyethylene compounds, polyethylene glycol compounds are preferable, and polyethylene glycol containing a crystallization controlling factor is particularly preferable.
Here, the crystallization control factor means an organic residue existing in the molecular chain or at the terminal and disturbing the symmetry of the repeating unit of polyethylene glycol. Crystallization control means that the melting point determined by differential scanning calorimetry (DSC, temperature rising condition 16 ° C./min) is lower than that of polyethylene glycol having the same molecular weight.

The copolymerization ratio of the hydrophilic compound (A) is not particularly limited, but from the viewpoint of spinnability, it is preferably 40 to 99% by weight based on the total weight of the polymer. Most of these compounds are preferably copolymerized in the polyester, but some of them may be present in a dispersed state in the polymer. The polar group-containing compound (B) contained in the copolyester (D) is not particularly limited, but a compound having a polar group represented by the following general formula [1] is preferable.

Y _i —R ₁ —X _n [1] (wherein Y _i = one or more polar groups selected from derivatives such as amino group, sulfone group, carboxyl group, hydroxyl group, amide group and phosphon group) , I = 1, an integer of 1 or more, R ₁
= Organic residue, X = ester-forming group, n = an integer of 1 or more. Here, the term “containing” means a state of being dispersed or copolymerized in polyester, and particularly preferably copolymerized. As the compound, a compound having a sulfonate group is particularly preferable.

By containing such a polar group-containing compound, not only the hygroscopicity of the polymer is further increased, but also hydrogen bond or ionic mutual bond action is generated in the polymer, and when it is formed into a fiber, It is possible to obtain the effect that changes in physical properties are less likely to occur. Further, from the viewpoint of preventing the occurrence of yarn breakage and making it less likely to change over time, the content of the polar group-containing compound (B) is 0 to 50 mol% with respect to the acid component constituting the entire polymer, Further 2
It is preferably 15 mol%.

The cross-linking agent (C) contained in the copolyester (D) is not particularly limited as long as it is a compound that reacts with the polyester to form a cross-linking structure, but the following general formula [2] It is preferable to use a polyfunctional compound represented by (R ₃ O) _n R ₂ (COOR ₄ ) _m [2] (where R ₃ = hydrogen or acetyl group, R ₂ = 3 to
Hexavalent organic residue, R ₄ = hydrogen or alkyl group, 3 ≦
m + n ≦ 6. Here, the term "containing" means a state of being dispersed or copolymerized in polyester, and it is particularly preferable that a crosslinked structure is formed by copolymerization.

The compound is preferably a polyfunctional carboxylic acid such as trimellitic acid or pyromellitic acid, or a polyol such as glycerin, trimethylolpropane or pentaerythritol, with trimellitic acid being particularly preferred. By including such a cross-linking agent (C), not only the moisture absorption rate of the polymer is further increased, but also the cross-linking structure is formed in the polymer, so that the physical properties of the fiber change with time. The effect of becoming difficult is obtained.

The proportion of the cross-linking agent (C) is preferably 0 to 30 mol%, more preferably 2 to 10 mol% with respect to the acid component constituting the entire polymer. Within such a range, the hygroscopicity can be kept high, the spinnability can be improved, and the fiber physical properties such as strength can be improved. In the present invention, at least one of the polar group-containing compound (B) and the crosslinking agent (C) may be contained in the copolyester (D). Of course, it is more preferable to include both the polar group-containing compound (B) and the crosslinking agent (C).

The copolymerized polyester (D) may contain pigments such as titanium oxide and carbon black, surfactants such as alkylbenzene sulfonates, various antioxidants, and coloring agents, as long as the object of the present invention is not impaired. It does not matter if an inhibitor, a light stabilizer, an antistatic agent or the like is added.
Next, among the hygroscopic polymers constituting the hygroscopic polyester fibers of the above two examples, the polyether ester amide (E) or the polyether ester amide mentioned as another example and another thermoplastic resin (F) The case of a mixture will be described.

The polyetheresteramide (E) is
A block copolymer having an ether bond or an ester bond in the same molecular chain. More specifically, one or more polyamide-forming components (G) selected from lactams, aminocarboxylic acids, salts of diamines and dicarboxylic acids, and polyethers composed of dicarboxylic acids and poly (alkylene oxide) glycols. A block copolymer polymer obtained by polycondensing the ester-forming component (H) can be preferably used.

As the polyamide-forming component (G) of the polyether ester amide (E), lactams, ω-aminocarboxylic acids, nylon salts and the like can be used, and one kind or a mixture of two or more kinds thereof can be used. Can be used. Preferred polyamide-forming component (G) is ε-caprolactam, nylon 66 salt. On the other hand, the polyether ester-forming component (H) that constitutes the soft segment of the polyether ester amide (E)
As the above, a dicarboxylic acid having 4 to 20 carbon atoms and poly (alkylene oxide) glycol are preferable.

The dicarboxylic acids having 4 to 20 carbon atoms include:
Aliphatic, aromatic dicarboxylic acids, alicyclic dicarboxylic acids, and the like can be used, and one kind or a mixture of two or more kinds can be used. Preferred dicarboxylic acids include polyamides such as adipic acid and seba polyglycine, general-purpose thermoplastic resins such as polyester and polyolefin, cinnic acid, decadic acid, terephthalic acid, and isophthalic acid.

As the poly (alkylene oxide) glycol, polyethylene glycol and poly (1,2)
-And 1,3-propylene oxide) glycol, polytetramethylene oxide glycol, polyhexamethylene oxide glycol, random or block copolymerization of ethylene oxide and propylene oxide, or tetrahydrofuran can be used, and polyethylene glycol is particularly preferable. The number average molecular weight of poly (alkylene oxide) glycol is 300 to 1000.
It can be used in the range of 0, preferably 500 to 4000.

The polyether ester amide block copolymer is obtained by polycondensing the above-mentioned polyamide-forming component (G) and polyether ester-forming component (H). Examples of the thermoplastic resin (F) mixed with the polyether ester amide include nylon 6
6, one or more of polyamides such as nylon 6, polyesters, and polyolefins. In particular, nylon 66, nylon 6, modified polyethylene terephthalate obtained by copolymerizing a sulfonate compound, and the like are preferable because they have good compatibility with polyether ester amide, can be finely dispersed with each other, and have little swelling with hot water.

Here, preferred sulfonate compounds as copolymer components of the modified polyester include 5-sodium sulfoisophthalic acid, 5- (tetraalkyl) phosphonium sulfoisophthalic acid and ester derivatives thereof, and sodium p-hydroxyethoxybenzenesulfonate. And potassium 2,5-bis (hydroxyethoxy) benzenesulfonate.

The copolymerization amount of this sulfonate compound is 0.1 with respect to the acid component in view of the compatibility with the polyether ester amide and the physical properties of the resulting blend fiber.
˜7 mol%, and more preferably 0.5 to 5 mol%. The mixing ratio of the polyether ester amide and the thermoplastic resin (F) is 5 from the viewpoint of obtaining a sufficient hygroscopic property and preventing cracking of the fiber surface due to swelling in a hot water atmosphere such as a dyeing process. ~ 50% by weight, and further 10-4
0% by weight is preferred.

In the present invention, the above-mentioned copolymerized polyester (D) or the polyether ester amide (E) or a mixture of the polyether ester amide and another thermoplastic resin (F) is used as a composite component or a blend component as a composite fiber. Further, the fiber-forming polymer (X) used in combination with the blended fiber is not necessarily limited, but examples thereof include polyolefins such as polyethylene and polypropylene, polyamides such as nylon 6 and nylon 66, polyethylene terephthalate, polybutylene terephthalate and the like. And the like. Among these, polyester mainly composed of polyethylene terephthalate, which is the most versatile synthetic fiber for clothing, is preferable.

Although the form of the composite fiber is not particularly limited, a core-sheath type composite fiber comprising a core portion 1 and a sheath portion 2 as shown in FIG. 1, and a core portion 1, a sheath portion 2 and a hollow as shown in FIG. Core-sheath type composite hollow fiber composed of a portion 3 and an island portion 1a and a sea portion 2 as shown in FIG.
A sea-island type composite fiber composed of a and a bonded type composite fiber in which the bonded portions 1b and 2b are bonded together as shown in FIG. 4 can be used.

For example, in the case of the core-sheath type composite fiber shown in FIG. 1 and the core-sheath type composite hollow fiber shown in FIG. 2, the core part 1 has a copolyester (D) and a polyether ester amide (E). ) Or a hygroscopic polymer such as a mixture of a polyether ester amide and another thermoplastic resin (F) and a fiber-forming polymer (X) in the sheath 2.

The composite ratio (% by weight) in this case is
Core / sheath = 5/95 to 90/10 is preferable, and further 1
0/90 to 30/70 is preferable. The lower limit of the composite ratio may be appropriately set for the purpose of imparting sufficient hygroscopicity, and the upper limit may be appropriately set from the viewpoint of preventing deterioration of spinnability and deterioration of fiber physical properties. The core-sheath type composite fiber may have either a concentric circle shape or an eccentric circle shape in cross section, and the fiber shape may be circular, or various irregular cross sections such as polygonal shape and H shape. .

In the case of the sea-island type composite fiber shown in FIG. 3 and the laminated type composite fiber shown in FIG. 4, the copolyester (D) and the polyether ester amide are added to the island portion 1a or one of the laminated portions 1b. (E) or polyetheresteramide and other thermoplastic resin (F)
And a fiber-forming polymer (X) for the sea part 2a or the other bonded part 2b.
Use

In this case, the hygroscopic properties of the fiber-forming polymer (X) such as the copolyester (D), the polyether ester amide (E) or a mixture of the polyether ester amide and another thermoplastic resin (F). The polymer composite ratio is preferably 5 to 90% by weight, more preferably 10 to 90% by weight.
30% by weight is preferred. The lower limit of the composite ratio is appropriately set for the purpose of imparting sufficient hygroscopicity, and the upper limit is appropriately set from the viewpoint of preventing deterioration of spinnability and deterioration of fiber physical properties.

In the case of blended fibers, fiber formation of hygroscopic polymers such as copolyester (D), polyetheresteramide (E) or a mixture of polyetheresteramide and other thermoplastic resin (F). The compounding ratio with respect to the polymer (X) is preferably 5 to 80% by weight, more preferably 7 to 30% by weight, based on the total amount of the polymer. The lower limit of the compounding ratio is appropriately set for the purpose of imparting sufficient hygroscopicity, and the upper limit is appropriately set from the viewpoint of preventing deterioration of spinnability and deterioration of fiber physical properties.

The above-mentioned copolyester (D) may contain other resins such as polyolefin, polyamide, polyester and polycarbonate within a range not impairing the hygroscopic effect. Further, to the fiber-forming polymer (X), pigments such as titanium oxide and carbon black, various antioxidants, anti-coloring agents, light-proofing agents, antistatic agents, etc. are added within the range that does not impair the object of the present invention. There is no problem even if it is done.

The hygroscopic fiber and fiber structure of the present invention are characterized in that a polymer mainly containing vinylcarboxylic acid and / or vinylsulfonic acid is added to the above hygroscopic polyester fiber. There is. As described above, the hygroscopic polyester fiber when treated with the polymer mainly containing vinyl carboxylic acid and / or vinyl sulfonic acid may be treated in the form of filament or staple raw yarn, or a woven or knitted fabric, You may make it process in the form made into the fiber structure represented by cloth, such as a nonwoven fabric.

In the present invention, the polymer mainly containing vinylcarboxylic acid and / or vinylsulfonic acid is
It means a vinyl carboxylic acid and / or vinyl sulfonic acid simple substance, or a copolymer with a cross-linking agent for imparting higher durability. Examples of vinyl carboxylic acids include acrylic acid, methacrylic acid, maleic acid,
Itaconic acid, butenetricarboxylic acid, etc. can be used.

Examples of vinyl sulfonic acid include 2-
Acrylamide-2-methylpropanesulfonic acid (hereinafter referred to as AMPS), 2-allyloxy-2-hydroxypropanesulfonic acid, sulfoethylmethacrylate, sodium styrenesulfonate, sodium isoprenesulfonate, sodium allylsulfonate, sodium methacrylsulfonate, etc. Can be used.

In the present invention, it is possible to use two or more kinds of these monomers. Particularly, AMPS and sodium styrenesulfonate are preferable from the viewpoint of polymerization efficiency and hygroscopicity. As the cross-linking agent, a polyfunctional vinyl monomer is preferable in order to make the resulting polymer three-dimensional, and examples thereof include those represented by the following general formula [3].

[0039] In order to accelerate crosslinking, vinyl monomers having a methylol group, such as N-methylol acrylamide and N-methylol methacrylamide, may be added to the extent that the texture is not made to be too hard. As with the vinyl sulfonic acid, the use of two or more cross-linking agents is not a problem.

In order to copolymerize the above monomers, a usual radical polymerization initiator can be used as the polymerization initiator. For example, an inorganic polymerization initiator such as ammonium persulfate, potassium persulfate or hydrogen peroxide, or 2,2 '
-Azobis (2-amidinopropane) dihydrochloride, 2,2'-azobis (N, N'-dimethyleneisobutyramidin) dihydrochloride, 2- (carbamoylazo) isobutyronitrile, etc. Initiators can be used. Further, a water-insoluble polymerization initiator such as benzoyl peroxide or azobisisobutyronitrile may be emulsified with a surfactant such as anion or nonion before use. Ammonium persulfate is preferably used in terms of cost and ease of handling. Further, in order to increase the polymerization efficiency, a so-called redox polymerization initiator using a peroxide and a reducing substance together as a polymerization initiator may be used.

The above-mentioned polymer mainly containing vinylcarboxylic acid and / or vinylsulfonic acid is added to the above hygroscopic polyester fiber in an amount of 1 to 20 owf. This application may be performed directly on the raw yarn of the hygroscopic polyester fiber, but it is preferably applied to the hygroscopic polyester fiber formed into a fiber structure such as cloth. If the amount of the polymer added to the hygroscopic polyester fiber is less than 1% owf, the hygroscopic performance will be poor, and if it exceeds 20% owf,
The texture becomes coarse and hard.

In the present invention, if necessary, a finishing agent such as a water repellent, a softening agent, a flame retardant, an antibacterial deodorant, an antistatic agent, etc. may be added to the treatment liquid of the above polymer. As a method for applying the treatment liquid to the cloth, a commonly used means can be used. For example, a padding method, a spray method, a kiss roll coater, a slit coater or the like can be used.

In the present invention, as a method for polymerizing vinylcarboxylic acid and / or vinylsulfonic acid,
Any means used for radical polymerization can be utilized. For example, dry heat treatment, steam treatment, dipping method,
A cold batch method, microwave treatment, ultraviolet treatment or the like can be used. These means may be applied alone, or in order to improve heating efficiency, for example, microwave treatment or ultraviolet treatment may be used in combination with steam treatment or dry heat treatment. Since the presence of oxygen in the air makes it difficult to proceed with the polymerization, in the case of dry heat treatment, microwave treatment, or ultraviolet treatment, it is preferable to treat under an inert gas atmosphere, and even in the case of the cold batch method, It is preferable to seal with a sealing material.

Of these polymerization methods, steam treatment is preferable from the viewpoint of polymerization efficiency and treatment stability.
The steam treatment may be any of normal pressure steam, superheated steam, and high pressure steam, but from the viewpoint of cost, normal pressure steam or superheated steam is preferable. The steam treatment temperature is preferably 80 to 180 ° C, more preferably 100 to 150 ° C. The steam treatment time may be about 1-10.
In addition, it is also preferable to carry out preliminary drying with an air dryer or a dryer before polymerizing the monomers.

[0045]

EXAMPLES In the examples described below, the following five types of test fabrics were used. Test material A Dimethyl terephthalic acid 19 as a copolyester
After adding 4 parts, 135 parts of ethylene glycol, 26.6 parts of dimethyl 5-sodium sulfoisophthalate, 7.5 parts of trimethyl trimellitate, and 0.1 parts of tetrabutyl titanate, the transesterification reaction was carried out, and then the molecular weight was 4000. 328 parts of polyethylene glycol was added and polymerized to produce a copolyester.

Using the copolymerized polyester thus obtained as the core component and polyethylene terephthalate as the sheath component, the copolymerized polyester constitutes 20% by weight of the total weight of the fiber, 50 denier 18 filaments (for warp yarn) and 7
A 5 denier, 36 filament (for weft) concentric core-sheath composite fiber was produced. Using this composite fiber, a plain weave having a vertical density of 106 fibers / inch and a horizontal density of 84 fibers / inch was woven, and then refined, dry heat set, dyed and dried.

Test Fabric B Test fabric A was prepared by using a copolymerized polyester in an amount of 3% by weight based on the total weight of the fibers. Test material C ε-caprolactam 340 parts, terephthalic acid 18 parts, and polyethylene glycol 100 having a molecular weight of 1000 were added and polymerized to obtain a polyetheresteramide block copolymer having a nylon 6 component ratio of 45% by weight. Manufactured.

70 parts by weight of the polyether ester amide block copolymer thus obtained and 30 parts by weight of modified polyethylene terephthalate obtained by copolymerizing 2.0 mol% of 5-sodium sulfoisophthalic acid were blended in a chip state. Using a core component and polyethylene terephthalate as a sheath component, the polyether ester amide block copolymer accounts for 20% by weight of the total fiber weight, 50 denier, 18
Concentric concentric sheath composite fibers of filament (for warp yarn) and 75 denier, 36 filament (for weft yarn) were spun.

Using this composite fiber, the vertical density is 106.
After weaving a plain weave having a book / inch and a horizontal density of 84 / inch, it was refined, dry heat set, dyed and dried. Test Dough D In Test Dough C, a polyetheresteramide block copolymer in an amount of 3% by weight based on the total weight of the fiber was produced.

Test Fabric E Using a 100% polyester multifilament,
After weaving a plain weave having a vertical density of 106 fibers / inch and a horizontal density of 84 fibers / inch, it was refined, dry heat set, dyed and dried. Moreover, each evaluation in the examples was based on the following methods.

Washing Automatic reversal spiral electric washing machine (manufactured by Toshiba Corp .; VH-1)
(With the same performance as 150), a 45 x 45 cm test cloth 500
g and 40 ± 2 ° C, slightly 0.2% alkaline synthetic detergent (JI
25 liters of SK 3371 weakly alkaline, type 1 solution was added, and the cloth was washed under strong conditions for 25 minutes. Next, after dehydration for 30 seconds by a centrifugal dehydrator, rinsing was performed for 10 minutes while overflowing room temperature water. Then, the above method in which dehydration is performed for 30 seconds again and rinsing is performed for 10 minutes under the same conditions is performed 5 times for washing. In the present invention, this was repeated 6 times and washed 30 times.

Adhesion amount of resin [(weight of cloth after processing-weight of cloth before processing) / (weight of cloth before processing)] × 100 (%) Here, the weight of cloth is an environment of 20 ° C. and 65% RH. The weight when left for 24 hours. Moisture absorption rate [(Weight of cloth when moisture is absorbed-Weight of cloth when it is absolutely dry) / (Weight of cloth when it is absolutely dry)] x 100 (%) Here, the weight of cloth when moisture is absorbed is 20 ° C after drying. 65
% RH or weight when left for 24 hours in an environment of 30 ° C./90% RH.

Feeling when a soft cloth was gripped was evaluated on the basis of five grades: very soft, soft, slightly hard, hard, and very hard. Example 1 After the test fabrics A and C were dipped in the treatment liquid having the following composition, they were squeezed with a mangle so that the squeezing ratio was 30%, and dried with a drier 120.
Dried for 1 minute at ℃.

Hygroscopic agent: AMPS 32 g / l Cross-linking agent: Monomer 6 g / l N-methylol acrylamide 2 g / l Polymerization initiator: ammonium persulfate 0. X = CH ₃ , n = 9 in the general formula [1]. After drying at 6 g / l, it was treated with a superheated steamer at 100 ° C. for 3 minutes, washed with hot water and dried. Then, it was set in a dryer at 180 ° C. for 1 minute and provided for evaluation.

The results are shown in Table 1. Example 2 Sample fabrics A and C were treated with a treating solution having the following composition to prepare Example 1
A sample was prepared by performing exactly the same treatment as described above. The results are shown in Table 1.

Hygroscopic agent: AMPS 160 g / l Crosslinking agent: Monomer 30 g / l N-methylolacrylamide 10 g / l Polymerization initiator: Ammonium persulfate 3 g / l in the general formula [1] where X = CH ₃ and n = 9 l Example 3 Sample fabrics A and C were treated with a treating solution having the following composition to prepare Example 1
A sample was prepared by performing exactly the same treatment as described above.

The results are also shown in Table 1. Moisture absorbent: AMPS 480 g / l Cross-linking agent: Monomer 90 g / l N-methylol acrylamide 30 g / l X = CH ₃ , n = 9 in the general formula [1] Polymerization initiator: Ammonium persulfate 9 g / l Comparative example 1 The test fabrics A and C were treated with the treatment liquid having the following composition in Example 1
A sample was prepared by performing exactly the same treatment as described above.

The results are also shown in Table 1. Moisture absorbent: AMPS 28 g / l Crosslinking agent: Monomer 4.5 g / l N-methylolacrylamide 1.5 g / l Polymerization initiator: ammonium persulfate 0 in the general formula [1] where X = CH ₃ and n = 9 0.5 g / l Comparative Example 2 Sample fabrics A and C were treated with a treatment liquid having the following composition in Example 1
A sample was prepared by performing exactly the same treatment as described above.

The results are also shown in Table 1. Moisture absorbent: AMPS 600 g / l Cross-linking agent: Monomer 120 g / l N-methylol acrylamide 40 g / l Polymerization initiator: Ammonium persulfate 12 g / l Comparative example: X = CH ₃ , n = 9 in the general formula [1] 3 The test fabrics B, D and E were treated in exactly the same manner as in Example 1 to prepare samples.

The results are also shown in Table 1. Comparative Example 4 Table 1 also shows the results of the test fabrics A to E without processing.

[0061]

[Table 1]

As is clear from the results shown in Table 1, the hygroscopic polyester fiber alone is not sufficient for hygroscopicity, but the present invention is further treated with a polymer mainly containing vinylcarboxylic acid and / or vinylsulfonic acid. It can be seen that the textile product of No. 1 has sufficient hygroscopicity with high washing durability while maintaining a soft texture.

[0063]

As described above, according to the hygroscopic fiber and the hygroscopic fiber structure of the present invention, it is possible to have a durable and excellent moisture absorbing / releasing property and yet have a soft texture. it can.

[Brief description of drawings]

FIG. 1 is a model diagram illustrating a cross section of a core-sheath type composite fiber used in the present invention.

FIG. 2 is a model diagram illustrating a cross section of a core-sheath type composite hollow fiber used in the present invention.

FIG. 3 is a model diagram illustrating a cross section of a sea-island type composite fiber used in the present invention.

FIG. 4 is a model diagram illustrating a cross section of a laminated conjugate fiber used in the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Core part 2 Sheath part 1a Island part 2a Sea part 1b, 2b Lamination part 3 Hollow part

Claims (4)

[Claims] 1. A hygroscopic fiber in which 1 to 20% owf of a polymer mainly composed of vinylcarboxylic acid and / or vinylsulfonic acid is added to a polyester fiber having hygroscopicity. 2. A composite fiber or blend in which the hygroscopic polyester fiber copolymerizes a hydrophilic compound and contains 5% by weight or more of a copolymerized polyester containing a polar group-containing compound and / or a crosslinking agent. The hygroscopic fiber according to claim 1, which is a fiber. 3. The hygroscopic polyester fiber comprises 5% by weight of a polyetheresteramide or a mixture of a polyetheresteramide and another thermoplastic resin.
The composite fiber or blended fiber containing the above.
The hygroscopic fiber described in 1. 4. A hygroscopic fiber structure composed of the hygroscopic fiber according to claim 1.