JPH1077577A - Hollow fiber modified with collagen - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a hollow fiber excellent in hygroscopicity, water absorbability, antistaticity and further moisture-retaining durability under low humidity by charging a specific water-absorbing polymer having collagen fixed and/or adhered thereto into the hollow of a specific polyester fiber. SOLUTION: This method for producing the hollow fibers comprises knitting polyester multifilaments having circular hollows, respectively, into a tricot half knitted fabric, scoring the knitted fabric, subjecting the scored knitted fabric to a caustic weight reduction treatment to scatteringly form holes penetrated from the surfaces of the fibers to their hollow parts, putting the treated knitted fabric in a closed vessel, vacuumizing the closed vessel, injecting an aqueous solution containing acrylic acid (salt), polyethylene glycol dimethacrylate, a water-soluble collagen and a polymerization initiator into the closed vessel, further vacuumizing the closed vessel to charge the aqueous solution into the fiber hollow parts, taking out the treated knitted fabric from the vessel, treating the knitted fabric with hot water, drying the treated fabric, and subsequently thermally treating the knitted fabric, thus obtaining the hollow fibers charged with the gel of the synthetic water-absorbing polymer having at least one kind of carboxylic acid (salt) groups and sulfonic acid (salt) groups and further having the collagen fixed and/or adhered thereto.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hollow fiber modified with collagen, and more particularly, to a hollow portion filled with a gel of a water-absorbing polymer in which collagen is fixed and / or fixed. The present invention relates to a hollow fiber which exhibits particularly excellent durability and moisture absorption even under low humidity and has a good feeling.

[0002]

2. Description of the Related Art Conventionally, attempts have been made to increase the hygroscopicity by adding natural proteins such as collagen and sericin to synthetic fibers to improve wearing comfort. For example, JP-A-5-339878, JP-A-6-17372, and JP-A-6-17373 disclose the micropores of a porous hollow fiber having micropores communicating from the fiber surface to the hollow portion. Further, it is disclosed that a natural protein is impregnated in the hollow portion and crosslinked and insolubilized to improve hygroscopicity. However, in these methods, the functional groups of the protein such as amino group and carboxyl group are reacted with a polyfunctional cross-linking agent such as an epoxy compound to insolubilize the protein, so that the functional groups of the protein responsible for hygroscopicity are reduced. In addition, since a large amount of a polyfunctional crosslinking agent is required to insolubilize proteins, there is a problem in that when trying to impart sufficient hygroscopicity, the hand becomes hard and cannot withstand practical use.

JP-A-7-300770 discloses a modified polyester fiber material in which collagen is bonded to the surface of polyester fiber by graft polymerization, and a polyoxyalkylene group having a molecular weight of 1,000 or more, A process for producing a fiber material is disclosed in which a treatment liquid obtained by adding a monomer containing two or more radically polymerizable double bonds is applied to a polyester fiber material and then polymerized. However, since the fiber material obtained by this method is post-processed on the fiber surface, it is necessary to naturally suppress the amount of adhesion to a low level in order to maintain a good hand, and sufficient moisture absorption cannot be obtained. In addition, the washing durability is poor.

Further, Japanese Patent Application Laid-Open No. Hei 7-26466 discloses that a fabric comprising a single polymer and having a hollow fiber having a high hollow ratio of at least 25% is provided at the polymer joint in the longitudinal direction of the hollow fiber. Along with the microgrooves as removal marks of the polymer are present in a state communicating with the hollow portion, and in the hollow portion, there is described a fabric made of hollow fibers, in which a fiber function-imparting agent is present. Animal proteins are exemplified as the agent for imparting function to fiber. However, in the fabric and the method for producing the fabric disclosed herein, there is described only an example in which the fiber function-imparting agent is used alone, and sufficient washing durability cannot be obtained.

As described above, there has been no synthetic fiber which has both sufficient durability and good moisture absorption, and even more, synthetic fiber having excellent durability and moisture absorption under low humidity. No fibers are present.

[0006]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a hollow fiber having both a sufficient durable hygroscopic property and a good feeling and having an excellent durable hygroscopic property under low humidity. I do.

[0007]

SUMMARY OF THE INVENTION The present invention relates to a hollow fiber having through-holes scattered in a hollow portion on the fiber surface, wherein collagen is fixed and / or fixed in the hollow portion of the hollow fiber. A collagen modified hollow fiber characterized by the presence of a polymer gel.

[0008] The hollow fiber of the present invention refers to a hollow fiber made of cellulose for chemical fibers such as rayon and acetate, and a polymer for synthetic fibers such as polyester and nylon. Among them, polyester hollow fibers are preferred. .

[0009] The polyester as used herein means terephthalic acid as a main dicarboxylic acid component and at least one dicarboxylic acid, preferably at least one selected from the group consisting of ethylene glycol, trimethylene glycol and tetramethylene glycol. Examples of the polyester include an alkylene glycol as a main glycol component. The polyester may contain a matting agent, an ultraviolet absorber, an antioxidant and the like, and this is preferable from the viewpoint of dyeing fastness such as light fastness. In addition, if necessary, catalyst,
Additives such as stabilizers, anti-coloring agents, flame retardants, fluorescent whitening agents, antistatic agents, heat-resistant agents, colorants, and inorganic particles may be included.

[0010] The hollow fiber can be produced by a conventionally known method. For example, the method described in Japanese Utility Model Publication No. 2-43879 can be arbitrarily adopted.

As a method of forming a through hole from the fiber surface to the hollow portion in the hollow fiber, for example, in the case of polyester hollow fiber, Japanese Patent Publication No. 61-601
No. 88, JP-B-61-31231, and the like, by subjecting a polyester hollow fiber to which an organic sulfonic acid metal salt is added and blended to an alkali weight-reducing treatment, a fine hole penetrating from the surface of the hollow fiber to the hollow portion. A method of forming a hole or the like can be arbitrarily adopted. Furthermore, if a high hollow fiber having a hollow ratio of 25% or more is subjected to alkali weight reduction treatment, a low-oriented portion and / or a low-longitudinal portion along the longitudinal direction of the fiber can be obtained without using an organic metal sulfonate as described above.
Alternatively, a through hole can be formed as a removal mark of the deformation strain concentration portion (see Japanese Patent Application Laid-Open No. Hei 7-26466).

The hollow fibers of the present invention include all the hollow fibers having a through hole extending from the fiber surface to the hollow portion as described above. Here, the size and number of the through-holes are not particularly limited, but the size of the through-holes is smaller than the size of the gel of the water-absorbing polymer filled in the hollow portion in the non-swelling state in the absolutely dry state. This is preferable from the viewpoint of durability such as washing durability of collagen.

The gel of the water-absorbing polymer in the present invention includes, for example, a gel of a natural water-absorbing polymer such as gelatin and a gel of a synthetic water-absorbing polymer, and can be handled at the monomer stage. In this respect, a gel of a synthetic water-absorbing polymer is preferable. Examples of the gel of the synthetic water-absorbing polymer include (a) a water-soluble monomer having at least one group selected from the group consisting of carboxylic acid groups, carboxylic acid groups, sulfonic acid groups and sulfonic acid groups; A) a monomer that becomes water-soluble by hydrolysis [a monomer having at least one hydrolyzable group (ester group, nitrile group, etc.)], (c) starch and / or cellulose, and (d) a cross-linking agent. Examples of the gel include a water-absorbing polymer gel obtained by polymerizing the component (a) and / or the component (b) and the component (d) as essential components, and performing hydrolysis as necessary.

Here, specific examples of the water-soluble monomer (a) include acrylic acid, methacrylic acid, crotonic acid,
Cinnamic acid, maleic acid, fumaric acid, citraconic acid, mesaconic acid, itaconic acid, methallyl sulfonic acid, styrene sulfonic acid, and their sodium and potassium salts,
Lithium salt and the like.

Specific examples of the gel of the water-absorbing polymer include a partially neutralized salt of a crosslinked poly (meth) acrylic acid, a partially hydrolyzed product of a crosslinked poly (meth) acrylamide, and a crosslinked (meth) acrylic acid (Meth) acrylamide copolymer, cross-linked sulfonated polystyrene, saponified vinyl ester-unsaturated carboxylic acid copolymer, cross-linked (meth) acrylic acid- (meth) acrylate copolymer, cross-linked Gels such as isobutylene-maleic anhydride copolymer and cross-linked carboxylic acid-modified polyvinyl alcohol can be mentioned.

Examples of gels of synthetic water-absorbing polymers other than those exemplified above include, for example, a polymer containing the above-mentioned component (a) and / or component (b), component (c) and component (d) as essential components. A gel of a water-absorbing polymer obtained by performing hydrolysis as required (specifically, JP-A-52-25886, JP-B-53-46199).
JP, JP-B-53-46200 and JP-B-5-46200
JP-A-5-21041), a gel obtained by polymerizing the component (a) and / or the component (b) and the component (c) (a hydrolyzate of a starch-acrylonitrile graft copolymer, A gel of the component (c) (eg, a carboxymethyl cellulose gel) such as a hydrolyzate of a cellulose-acrylonitrile graft copolymer, and a polymer of the component (a) and / or (b) having self-crosslinking properties [ Self-crosslinking poly (meth)
Acrylate]. These water-absorbing polymer gels can be used alone or
Mixtures of more than one species can be used.

The gel of the above-mentioned water-absorbing polymer preferably has a water absorption performance of at least 1 ml / g with respect to pure water, and particularly preferably has a water-absorbing ability of 5 to 1,000 ml / g. Further, the gel of the water-absorbing polymer of the present invention,
The filling amount of the hollow fiber in the hollow portion is preferably 1% by weight or more (based on the basic hollow fiber) in a non-swelling state in a completely dry state, from the viewpoint of durability and moisture absorption, and is preferably 5% by weight.
More preferably, it is the above. If the amount is too large, the hollow fibers tend to split when the gel absorbs and swells, so the amount is preferably 80% by weight or less.

As a method for filling the gel of the water-absorbing polymer into the hollow portion of the hollow fiber, the following method can be preferably exemplified. The hollow fiber is preferably used in the form of a fibrous structure such as a woven or knitted fabric, (i) a non-crosslinked product of a water-absorbing polymer and / or a constituent monomer of the water-absorbing polymer, (ii) a crosslinking agent, and preferably (iii) ) Dipping in a solution containing a polymerization initiator or a catalyst, replacing the air in the hollow portion of the hollow fiber with the solution, and then heating to effect a crosslinking reaction of the uncrosslinked water-absorbing polymer or polymerization of the monomer. A method in which a crosslinking reaction is caused to form a gel of a water-absorbing polymer.

The above hollow fiber is preferably in the form of a fibrous structure such as a woven or knitted fabric, and (i) an uncrosslinked product of a water-absorbing polymer and / or a monomer constituting the water-absorbing polymer;
(i) dipping in a solution containing a crosslinking agent, and preferably (iii) a polymerization initiator or a catalyst, followed by pressing with a mangle or the like, followed by sealing with a polymer film such as a polyvinylidene chloride film and leaving to stand. By
The air in the hollow portion of the hollow fiber is replaced with a solution,
A method of forming a gel of a water-absorbing polymer by heating to cause a crosslinking reaction of an uncrosslinked water-absorbing polymer or a polymerization / cross-linking reaction of the above-mentioned monomer.

The above hollow fibers, preferably in the form of a fibrous structure such as a woven or knitted fabric, are placed in a closed container and depressurized to remove air from the hollow portions of the hollow fibers. A solution containing an uncrosslinked product and / or a monomer of the water-absorbing polymer, (ii) a crosslinking agent, and preferably (iii) a polymerization initiator or a catalyst is poured into the container and filled in the hollow portion. A method of forming a gel of a water-absorbing polymer by heating to cause a crosslinking reaction of an uncrosslinked water-absorbing polymer or a polymerization / cross-linking reaction of the above-mentioned monomer.

Here, the solvent of the above solution may be any solvent which can dissolve the above components, for example, water and / or
Alternatively, an organic solvent soluble in water can be used. Examples of water-soluble organic solvents include alcohols such as isopropyl alcohol, ketones such as methyl ethyl ketone, tetrahydrofuran, N, N-dimethylformamide, dimethyl sulfoxide, N, N-dimethylacetamide,
N-methyl-2-pyrrolidone and the like. Among them, water is particularly preferred.

The cross-linking agent may be any as long as it can cross-link the water-absorbing polymer to form a water-insoluble gel. For example, a compound having two or more vinyl groups and / or epoxy groups in one molecule And polyvalent metal compounds. Among them, a water-soluble crosslinking agent is preferable.

Among them, compounds having two or more vinyl groups and / or epoxy groups in one molecule include polyethylene glycol dimethacrylate, polyethylene glycol diacrylate, polyethylene glycol diglycidyl ether, glycerin di (or tri) methacrylate, Glycerin di (or tri) acrylate, glycerin di (or tri) glycidyl ether, trimethylolpropane di (or tri) methacrylate, trimethylolpropane di (or tri) acrylate,
Trimethylolpropane di (or tri) glycidyl ether and the like can be mentioned, and these can be used alone or in combination of two or more.

Further, examples of the polyvalent metal compound include inorganic salts, organic carboxylate salts and complex salts of divalent or higher valent metals. Here, as a metal having two or more valences,
Calcium, magnesium, zinc, manganese, cobalt, aluminum, titanium, tin, copper, iron, chromium, nickel, zirconium and the like are preferable. As the polyvalent metal salt, chlorides, sulfates, nitrates, and succinic acids of these metals Salts and ethylenediaminetetraacetic acid complexes are preferred. Specific examples of the polyvalent metal compound include calcium acetate, magnesium acetate, basic aluminum acetate, zinc acetate, manganese acetate, cobalt acetate, aluminum sulfate, calcium chloride, magnesium chloride, stannous sulfate, EDTA-Ca, and EDTA-Mg. And the like. These polyvalent metal compounds can be used alone or in combination of two or more.

Examples of the polymerization initiator include peroxides such as potassium persulfate, ammonium persulfate, hydrogen peroxide and benzoyl peroxide; cerium ammonium salts such as ceric ammonium sulfate and ceric ammonium nitrate; , Α, α-azobisisobutyronitrile and the like. Examples of the catalyst include tertiary amines, quaternary ammonium salts, imidazole compounds, boron trifluoride, Zn (BF ₄ ) ₂ , KOH, Sn
Cl _{4 and the} like.

In the above method, it is more preferable to use a solution containing a monomer constituting the water-absorbing polymer, because the viscosity is low and the hollow portion can be easily filled. Further, in the fiber of the present invention, the gel of the water-absorbing fiber polymer is present only in the hollow portion of the hollow fiber, and is substantially absent on the outer surface of the hollow fiber and the inter-fiber space. It is preferable for imparting excellent durability and the like without impairing the original feeling of the obtained woven or knitted product.

As a method for realizing this embodiment, for example, the following method can be preferably exemplified. After filling a hollow part with a solution containing (i) an uncrosslinked product of the water-absorbing polymer and / or a constituent monomer of the water-absorbing polymer, (ii) a crosslinking agent, and preferably (iii) a polymerization initiator or a catalyst, A method of imparting a polymerization (crosslinking) inhibitor such as hydroquinone or hydroquinone monomethyl ether to the outer surface of the hollow fiber prior to the crosslinking reaction of the uncrosslinked water-absorbing polymer or the polymerization / crosslinking reaction of the above monomer.

An uncrosslinked product of the above water-absorbing polymer and / or
Alternatively, a solution containing the constituents of the water-absorbing polymer, the crosslinking agent, and preferably a polymerization initiator or a catalyst is filled in the hollow portion, and then the temperature is 50 to 130 ° C., preferably 70 to 1
Treating in a solvent such as an oil bath at 00 ° C to polymerize and crosslink the water-absorbing polymer in the hollow portion, and at the same time wash and remove the uncrosslinked water-absorbing polymer and monomer present on the outer surface of the hollow fiber and the interfiber space. how to.

An uncrosslinked product of the above water-absorbing polymer and / or
Alternatively, a solution containing the constituent monomer of the water-absorbing polymer, a crosslinking agent, and preferably a polymerization initiator or a catalyst is filled in a hollow portion, and then a crosslinking reaction of an uncrosslinked water-absorbing polymer or a polymerization / cross-linking reaction of the above monomer is performed. prior to,
A method in which the hollow fibers are washed with a solvent such as water at room temperature to remove uncrosslinked water-absorbing polymers and monomers present on the outer surfaces of the hollow fibers and the interfiber spaces.

In the fiber of the present invention, collagen is fixed and / or fixed to the gel of the water-absorbing polymer. The term “fixed” as used herein means that they are chemically bonded mainly by graft polymerization or the like,
"Fixed" means primarily physically bonded. As the above-mentioned collagen, collagen, tropocollagen, atelocollagen and the like can all be used, and it may be water-insoluble fine particles, or may be water-soluble, and may be a solution, a dispersion liquid (emulsion liquid) or the like. Preferably, it is handled in form. This collagen can be used alone or in combination of two or more.

In order to fix and / or fix the collagen in the gel of the water-absorbing polymer, for example, after drying the hollow fiber having the gel of the water-absorbing polymer in the hollow portion, an aqueous solution or water containing collagen is used. A method in which the dispersion is brought into contact with the dispersion at an arbitrary temperature from room temperature to a boiling temperature to impregnate the hollow fiber with the liquid and dry; or a method of filling the hollow portion of the hollow fiber with a gel of a water-absorbing polymer. The above-mentioned collagen component is dissolved or dispersed in the filling liquid in the above, and the same procedure is performed thereafter. Above all, in the latter method of filling a hollow portion of a hollow fiber with a gel of a water-absorbing polymer, a method of dissolving or dispersing collagen in a filling solution and then performing the same method is the method in which collagen is graft-polymerized to a water-absorbing polymer. Is chemically fixed, which is preferable in that durable hygroscopicity is more excellent.

The amount of collagen in the water-absorbing polymer gel is not particularly limited, but is preferably based on 100 parts by weight of the water-absorbing polymer gel in an absolutely dry state.
It is in the range of 0.1 to 100 parts by weight. If the amount is too small, the moisturizing effect tends to be insufficient, while if it is too large, the moisturizing washing durability tends to be insufficient. In addition, the gel of the water-absorbing polymer of the present invention may contain a fragrance, a coloring agent, a stabilizer, an antioxidant, an ultraviolet absorber, and the like, if necessary, in addition to the collagen.

The hollow fiber of the present invention is a hollow fiber in which through-holes are scattered in a hollow portion, and the hollow portion of the hollow fiber has
Since a gel of a water-absorbing polymer to which collagen is fixed and / or fixed is present, not only is it excellent in hygroscopicity, water absorbency, and antistatic properties, but it is also extremely excellent in moisture retention in low humidity. Shows an outstanding durability that is hardly lost by repeated washing. For this reason, it not only exhibits excellent wearing comfort under high temperature and high humidity in summer, but also has excellent moisture retention under low temperature and low humidity in winter, preventing human skin from drying. It has a "gentle" function and can be developed as an all-season material throughout the year. In addition, since the hollow fiber of the present invention does not have a hard feeling because the gel of the water-absorbing polymer to which collagen is fixed and / or fixed is present in the hollow portion, innerwear, nighty, blouse, and sportswear In the use of clothing such as, it is particularly useful because it can exhibit its characteristics. Among them, underwear such as pantyhose, lingerie, slips, petticoats, camisoles, shorts, foundations such as girdle, brassiere, body suits, and further, clothing applications to be worn in direct contact with the skin such as belly bands, gloves, etc. Demonstrates excellent effects.

[0034]

The present invention will be further described below with reference to examples, but the present invention is not limited to these examples. Parts and% in the examples indicate parts by weight and% by weight, respectively, and the moisture absorption, washing durability, friction voltage, and moisture retention were measured by the following methods.

[0035] After pre-drying of the moisture absorption rate 50 ° C. × 2 hours, from the equilibrium weight (W ₁₎ by weight of the absolutely dried sample at 105 ° C. × 2 hours and (W ₀₎ at a temperature 20 ° C. × RH 90%, the following formula Was calculated by Moisture absorption (%) = [(W ₁ −W ₀ ) / W ₀ ] × 100 Washing durability According to JIS L-1018-77 6.36 H method. The washing was repeated 30 times. A friction band voltage rotary static tester (Kyoto Univ., Kaken formula) was used in accordance with JIS L-1094 8.2B method.
The friction cloth was a cotton width and the measurement conditions were 20 ° C. × 40% RH. The smaller the friction band voltage, the better the antistatic property.

[0036] The overnight moisture-conditioned samples with moisture 20 ° C. × RH40%, the glass substrate was immersed for 2 hours in water at room temperature and dried in the washing machine of the dehydrator.
The sample was air-dried in an atmosphere of 20 ° C. × 40% RH, and the moisture content (20 ° C. × R
H40%) (based on the weight of a sample that was conditioned overnight). This is defined as the moisture perception limit moisture content. Furthermore, natural drying was continued, and the time until the sample weight returned to the original weight was measured. Starting from the time when the moisture perception limit moisture content is reached, 2
The time to return to the equilibrium weight of 0 ° C. × 40% RH is defined as the moisturizing time. The larger the value, the better the moisture retention.

Example 1 Melt spinning was carried out using a spinneret having a spinning hole having an arc-shaped opening in which four circular slits were closed, and an intrinsic viscosity of polyethylene terephthalate (titanium dioxide; 0.62). The undrawn yarn of the hollow fiber consisting of 0.07%) was drawn in a conventional manner to obtain a round hollow multifilament having 35 denier / 12 filaments and a hollow ratio of 40%. Using this hollow multifilament, a 28 gauge tricot half knit fabric is knitted, refined according to a conventional method, and then treated in an aqueous solution of sodium hydroxide 50 g / l at a temperature of 105 ° C. for 10 minutes to reduce the weight loss rate. The knitted fabric was made 20%, and then dyed under the following conditions.

Mikawhite KTN conc [manufactured by Nippon Kayaku Co., Ltd.]; 1% owf acetic acid; 0.3 g / l Disper VG [manufactured by Meisei Chemical Industry Co., Ltd.];
g / l After staining at 130 ° C for 30 minutes, soaping was performed, and then drying was performed at 100 ° C for 5 minutes. When the multifilament was taken out from the obtained knitted fabric and its surface was observed with a scanning electron microscope, a communication hole having a width of 0.2 to 2.0 μm and a length of 10 to 150 μm per 100 μm in the fiber axis direction was obtained. There was at least one.

Next, the knitted fabric is placed in a closed container, and the pressure in the container is reduced to 0.1 Torr using a vacuum pump.
Subsequently, an aqueous solution (filling liquid) having the following composition was poured into the container. Sodium acrylate; 14 parts Acrylic acid 4 parts Polyethylene glycol (average molecular weight = 600) dimethacrylate; 7 parts Water-soluble collagen 10 parts Potassium persulfate 0.5 part Water 64.5 parts After injecting the above aqueous solution, use a vacuum pump. The pressure was further maintained for 10 minutes. At this time, the degree of vacuum in the container is
0.2 Torr.

Subsequently, the knitted fabric was immersed in boiling water at 100 ° C. for 3 minutes while being rocked, and subsequently dried, and then subjected to a heat treatment at 120 ° C. for 1 minute. The weight increase of the knitted fabric due to this series of filling processing, that is, the filling rate is 2
As a result of observing the knitted fabric with a scanning electron microscope, the solid content was present only in the hollow portion of the hollow fiber, and the outer surface of the fiber, the interfiber space, and the texture There was no adhesion between them. For this reason, the obtained fabric had a soft feel and touch equivalent to that of the unprocessed product. The moisture absorption rate, friction band voltage and moisture retention of this fabric were as shown in Table 1.

Comparative Example 1 A water-absorbing polymer gel containing sodium acrylate as a main constituent unit was prepared in the same manner as in Example 1 except that the composition of the filling liquid used in Example 1 was changed to the following composition. The hollow portion of the hollow fiber was filled. Sodium acrylate; 14 parts Acrylic acid 4 parts Polyethylene glycol (average molecular weight = 600) dimethacrylate; 7 parts Potassium persulfate 0.5 part Water 64.5 parts Moisture absorption, frictional band voltage, moisture retention of the obtained knitted fabric Was as shown in Table 1.

Example 2 The knitted fabric obtained in Comparative Example 1 was replaced with 10% of water-soluble collagen.
After immersion in an aqueous solution for 2 hours and then air drying, 12
The gel was heat-treated at 0 ° C. for 1 minute to contain 4.5% collagen based on the absolute dry weight of the gel.
Table 1 shows the moisture absorption rate, friction voltage, and moisture retention rate of the obtained knitted fabric.

[0043]

[Table 1]

[0044]

According to the present invention, in addition to hygroscopicity, water absorption and antistatic properties, it is extremely excellent in durable moisture retention under low humidity, and
A hollow fiber with a soft feel is obtained, and it is used for underwear such as pantyhose, lingerie, slip, petticoat, camisole, shorts, etc., foundation for girdle, bra, body suit, etc., and for clothing such as yukata, belly band, gloves etc. Can be particularly preferably used.

Claims (3)

[Claims] 1. A hollow fiber in which through-holes are scattered on the fiber surface to a hollow portion, wherein a gel of a water-absorbing polymer to which collagen is fixed and / or fixed is present in the hollow portion of the hollow fiber. A hollow fiber modified with collagen, characterized in that: 2. The collagen-modified hollow fiber according to claim 1, wherein the hollow fiber is a polyester fiber. 3. The gel of the water-absorbing polymer has a carboxylic acid group,
The collagen-modified hollow fiber according to claim 1, which is a gel of a synthetic water-absorbing polymer having at least one group selected from the group consisting of a carboxylate group, a sulfonate group and a sulfonate group.