JPH08269873A - Chemical fiber for clothing and method for producing the same - Google Patents

Abstract

(57) [Summary] [Structure] Chemical fibers for clothing, in which a coating layer composed of an enzyme protein cross-linked by a cross-linking agent is formed on the surface of a single fiber of the chemical fiber, and the chemical fiber is immersed in a solution containing the enzyme protein. The above-mentioned enzyme protein is adsorbed on the single fiber surface of the fiber,
Next, a chemical fiber for clothing is produced by crosslinking the enzyme protein with a crosslinking agent. [Effect] According to the present invention, it is possible to obtain a chemical fiber for clothing in which a uniform coating layer of an enzyme protein is formed on the surface of the single fiber without causing a change in the internal structure of the single fiber of the chemical fiber.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a chemical fiber for clothing, and more particularly to a novel chemical fiber for clothing in which a coating layer containing an enzyme protein is formed on the surface of a chemical single fiber.

[0002]

2. Description of the Related Art Chemical fibers are classified into recycled fibers such as viscose rayon and synthetic fibers such as polyester, acrylic and nylon. Of these, the recycled fibers may undergo splitting (fibrillation) on the surface of the single fibers during repeated wearing and washing at home, resulting in so-called fluffing or pilling. Due to the fluffing and pilling, the texture of the cloth is changed, and in some cases, the texture is deteriorated due to hardening of the cloth, and the gloss is deteriorated. In order to prevent deterioration of the texture and gloss of the recycled fiber, it is necessary to prevent fuzzing and pilling, and further suppress fibrillation which causes the fluffing and pilling.

Conventionally, as a technique for suppressing fibrillation, a method of swelling fibers by an alkali treatment in which a cloth is dipped in a caustic aqueous solution, a cloth containing a fibrin-reactive resin (urea-formalin resin, melamine resin, Processing method by treatment with glyoxal resin (JP-A-62-8)
No. 5082).

However, the above-mentioned method has the effect of suppressing the fibrillation of the single fibers of the regenerated fibers and imparting the durability of gloss, but the treatment with the fibrin-reactive resin causes the inter-fibrous materials within the single fibers to be separated. Structural change due to cross-linking and accompanying texture change, deterioration of texture occurs in some cases,
It was not satisfactory in terms of texture. From this, when suppressing the fibrillation on the single fiber of the recycled fiber and maintaining the texture at the same time, a recycled fiber in which only the surface of the single fiber is modified without changing the internal structure of the single fiber and a modification method thereof are desired. It is rare.

[0005] On the other hand, synthetic fibers are fibers that are less comfortable to the body in terms of texture and feel when worn, as compared with natural fibers such as wool and silk. One of the causes is that synthetic fibers manufactured from petroleum-based raw materials have excellent water absorption properties such as those found in natural fibers even though they have excellent strength because the surface is hydrophobic. It is considered that it has no hygroscopicity. In order to solve these problems, chemical treatment is performed for the purpose of imparting hydrophilicity to synthetic fibers. As an example, a hydroxyl group, an amino group,
There are a method of introducing a hydrophilic group such as a carboxyl group to the surface of the single fiber and a method of making the surface of the single fiber porous by plasma treatment. However, in the former case, it is difficult to control the surface of the single fiber, so that the reaction may proceed excessively, and thus the strength of the fiber is significantly reduced. In the latter case, there is a problem that the processing device becomes large. There is also a method of hydrophilizing synthetic fibers by fixing a substance having a hydrophilic group on the surface of the constituent fibers with a crosslinking agent.
As such a method, for example, a method of forming a film on the surface of a synthetic fiber using a polyamino acid and a cross-linking agent to make the surface hydrophilic (Japanese Patent Laid-Open No. 3-199471) has been proposed.

However, it is difficult to control the polymerization / synthesis of polyamino acid to form a film composed of polyamino acid having a single molecular weight by the above-mentioned method. Since a single fiber group (yarn) and a film covering the entire fabric are formed, even if the fibers can be made hydrophilic, the degree of freedom of the fibers is lost, and as a result, the texture of the fibers is hardened. Deterioration will occur. From this, it is important that the hydrophilic treatment at the single fiber level does not reach a wider range than that of the single fiber group, and such a modified synthetic fiber and its modification method are desired.

[0007] From the above, if it is possible to obtain a regenerated fiber in which fibrillation is suppressed without impairing the texture and a synthetic fiber to which hydrophilicity is imparted, it can be said that the chemical fiber for clothing has an extremely large added value. Become.

[0008] Therefore, an object of the present invention is to provide a chemical fiber in which only the single fiber surface of the chemical fiber is modified, and a method for producing the same.

[0009]

Under such circumstances, the present inventor has conducted extensive studies on proteins, particularly enzyme proteins and a crosslinking agent for crosslinking the same, and as a result, a solution containing the enzyme protein under specific conditions has been obtained. By soaking the chemical fiber in it, the enzyme protein is uniformly adsorbed only on the surface of the single fiber of the chemical fiber, and by cross-linking it, the coating layer can be formed only on the surface of the single fiber. Found that the effect of suppressing fibrillation is exhibited, and that the effect of chemical fiber is rendered hydrophilic on the surface. Further, they have found that the coating layer is hardly detached even by washing and the effect can be maintained for a long period of time, and that a chemical fiber suitable for clothing can be obtained, and the present invention has been completed.

That is, the present invention provides a chemical fiber for clothing in which a coating layer made of an enzyme protein cross-linked with a cross-linking agent is formed on the surface of a single fiber of the chemical fiber.

Further, the present invention is characterized in that the chemical fiber is immersed in a solution containing the enzyme protein to adsorb the enzyme protein on the surface of the monofilament of the fiber, and then the enzyme protein is crosslinked with a crosslinking agent. A method for producing a chemical fiber for clothing is provided.

The chemical fiber applied to the present invention means a regenerated fiber and a synthetic fiber, and examples of the regenerated fiber include viscose rayon, cupra and tencel.
As synthetic fibers, polyester, acrylic, nylon,
Examples thereof include vinylon, polypropylene, polyethylene, polyvinyl chloride, vinylidene, polyurethane and benzoate. In addition, when these chemical fibers are immersed in a dilute solution of an enzyme protein described below in the form of a raw yarn, a fibrous material or a non-woven fabric, and the enzyme protein is adsorbed on the surface of the single fiber of the chemical fiber, the raw yarn, etc. There is no problem even if fibers other than chemical fibers such as natural fibers are mixed.

The enzyme protein applied to the present invention means a generic term for proteins having a specific structure for having a catalytic action. In other words, whether or not the catalytic function is expressed,
All proteins that have a structure for catalysis are applicable.

The origin of the enzyme protein varies depending on the organism to be produced, and there are animal origin, plant origin, and microbial origin. In the present invention, enzyme proteins of all origins can be used.

Such enzyme proteins include hydrolases, lilases, oxidorectases, ligases, transferases and imerases, all of which can be used, when classified according to the reactivity of the enzyme. Of these, hydrolases are preferably used, and peptidases such as protease, glucosidases such as cellulase and amylase, and esterases such as lipase can be used.

The molecular weight of the enzyme protein is preferably 10,000 or more, more preferably 20,000 to 300,000. In addition, most of the molecular weights of enzyme proteins are 10,000 or more,
It is almost difficult for the recycled fibers such as rayon to penetrate into the inside of the single fiber, and synthetic fibers cannot penetrate due to the denseness inside the single fiber. That is, the site where the enzyme is adsorbed in the chemical fiber is limited to only the surface of the single fiber.

The enzyme protein may be used alone or in combination of two or more kinds, and even if a protein other than the enzyme protein is mixed in the protein dilution solution described later, it is preferential due to the adsorptivity of the enzyme protein. In addition, since the enzyme protein is adsorbed on the surface of the monofilament of the chemical fiber, it is not necessary to use the purified and expensive enzyme protein.

The cross-linking agent applied to the present invention is mainly one having reactivity with a functional group in a protein, and is not particularly limited as long as it causes cross-linking by a reaction between protein molecules and within a protein molecule. For example, “Shinsei Chemistry Laboratory 1 Protein IV Structure-Function Relationship Chapter 13 Crosslinking, P2
07-254 (Tokyo Kagaku Doujin Co., Ltd.) "and" Biochemical Experimental Method 13 Chemical Modification of Proteins (below) Chapter VI Cross-linking Reaction,
Known cross-linking agents described in, for example, P81-113, Motonobu Ohno (Society Press Center) can be used. In particular, aldehyde compounds, epoxy compounds, isocyanate compounds and the like are highly reactive and can be preferably used. A wide variety of conventionally known aldehyde compounds can be used, and examples thereof include formaldehyde and dialdehydes such as glyoxal, malonaldehyde, and glutaraldehyde. As the epoxy compound, ethylene glycol, polyethylene glycol, propylene glycol, polypropylene glycol, glycerin, sorbitol, polyglycerol, pentaerythritol, tris (2-hydroxyethyl), isocyanurate, trimethylolpropane, neopentyl glycol, phenol ethylene oxide, And mono- and polyglycidyl ethers of lauryl alcohol ethylene oxide, and epoxy group-containing coupling agents. These epoxy compounds are used by dissolving them in water, but when the solubility is low, it is preferable to dissolve them in a small amount of an organic solvent such as dioxane or a mixed solvent of isopropyl alcohol and water.

As the isocyanate compound, toluene diisocyanate, diphenylmethane diisocyanate,
Examples thereof include compounds having two or more isocyanate groups in one molecule such as hexanemethylene diisocyanate, isophorone diisocyanate, and nitalin diisocyanate. It is preferable that these isocyanate compounds are dissolved in a known organic solvent capable of cross-linking with a protein, for example, chloroform, hexane, toluene or the like.

Next, the method for producing the chemical fiber for clothing of the present invention will be explained. First, the chemical fiber is immersed in a dilute solution of the enzyme protein. In this case, it is preferable to shake or stir the solution in order to increase the adsorption efficiency of the enzyme protein.

The solvent for diluting the enzyme protein has a pH of 1 to
It is preferable to use 10 acidic buffers, neutral buffers and weakly alkaline buffers, and these buffers are used to dilute the enzyme protein and at the same time adjust the pH of the solution. The pH of the diluted solution depends on the adsorption conditions of the enzyme protein on the chemical fiber.
It is preferable to adjust to an acidic or neutral region of 3 to 8. The temperature of the diluted solution does not cause heat denaturation of the protein 6
The temperature is preferably 0 ° C. or lower, and particularly when a regenerated cellulose fiber such as rayon is treated with an enzyme that hydrolyzes cellulose such as cellulase, it is preferably performed at a low temperature of 0 to 5 ° C. The ionic strength of the diluted solution is preferably 0.01 or more, and particularly preferably 0.05 to 0.2, from the viewpoint of the concentration capable of maintaining the pH buffering ability of the buffer solution. In the method of the present invention, a coating layer (adsorption layer) is formed on the surface of chemical fibers by adsorption of enzyme proteins.
Therefore, the concentration of the enzyme protein in the diluted solution may be low, but the adsorption amount of the enzyme protein on the single fiber is preferably ³ to 15 mg / m ² per fiber surface area.

The time for immersing the fiber in the dilute solution of the enzyme protein can be set until the adsorption equilibrium is reached. The immersion is preferably carried out under the conditions of Langmuir-type adsorption isotherm showing monomolecular adsorption in the relationship between the enzyme protein concentration in the aqueous solution and the protein adsorption amount on the fiber. When determining the adsorption equilibrium time of enzyme protein or plotting the adsorption isotherm, measure the change in protein concentration in the solution caused by adsorption to the fiber, and measure the amount of protein in the aqueous solution (enzyme concentration) before and after adsorption and the treated fiber The adsorption amount can be roughly calculated from the amount and the specific surface area of the fiber by the following formula (1). Also,
The protein amount in the aqueous solution is the most typical Lowry method (DC-protein assay method; BIO
-Manufactured by RAD), bovine serum albumin is obtained as a calibration curve and converted to bovine serum albumin, and the specific surface area of the fiber is calculated by the BET multipoint method by krypton adsorption. The amount of protein adsorbed per fiber surface area is expressed in mg / m ² .

[0023]

[Equation 1] Adsorption amount (mg / m ² ) = [(X _A −X _B ) × (V /
W)] / S × 1000

Here, W: amount of fiber used (g) V: amount of enzyme solution (l) X _A : enzyme concentration before adsorption (g / l) X _B : enzyme concentration after adsorption (g / l) S : Specific surface area of the used fibers (m ² / g)

After the enzyme protein is adsorbed on the chemical fiber as described above, a crosslinking treatment is carried out using a crosslinking agent. The cross-linking treatment can be carried out in the same solution without drying the fibers after adsorbing the enzyme protein, or by transferring it to another solution. Further, it can also be performed on fibers that have been pulled out of the solution and dried. The concentration of the cross-linking agent varies depending on the functional group equivalent (molecular weight / number of functional groups), but the total number of moles of functional groups is calculated from the amount of adsorbed protein per fiber weight,
The amount of the crosslinking agent used may be determined accordingly. The temperature of the catalyst for carrying out the crosslinking reaction is set by the crosslinking agent used,
It is preferable that the pH of the solution is changed from weakly acidic to weakly alkaline.

Further, it is necessary to carry out the cross-linking under the condition that the adsorbed state which is the previous stage is not damaged. For example, an aldehyde compound (crosslinking agent) can easily react with an amino group in a protein at room temperature, and can form a crosslink in an adsorbed state. On the other hand, the epoxy compound (crosslinking agent) is placed under conditions such as heating or heating in order to accelerate the reaction with the amino group and the carboxyl group in the protein. The protein may be heat-denatured by heating or heating. However, it can be used as long as the uniformity of the protein coating layer on the surface of the single fiber is not lost.
After the treatment with the cross-linking agent, washing with water and washing with hot water are thoroughly performed according to a conventional method.

The enzymatic activity of the coating layer composed of the enzyme protein cross-linked by the cross-linking agent on the surface of the monofilament of the chemical fiber is active when the chemical fiber forming the coating layer is used for clothing (wear). Not preferably. Usually, most of the enzymatic activity is lost in the crosslinking step,
When the enzyme activity remains, it is preferable to use a means for inactivating the activity. It has been confirmed by dyeing with a dye for protein dyeing that the coating layer of the crosslinked enzyme protein does not release the protein even after being washed 20 times in a domestic washing machine. I understand.

The chemical fiber treated in this way has only the surface of the monofilament modified without causing a change in the structure inside the monofilament. It is possible to chemically modify the layer) to chemically modify it. That is, a substance having a new function can be reacted with and bonded to the functional group derived from protein and the unreacted functional group of the crosslinking agent. For example, for functional groups derived from proteins, adsorption layers (enzyme proteins)
After crosslinking, it can be dyed uniformly by reacting with a dye that dyes protein fibers such as wool and silk. Further, by forming a coating layer on the surface of the monofilament, it is expected to have resistance to physical force applied from the outside such as wearing and washing for home use, and to endure long-term use.

[0029]

According to the present invention, it is possible to obtain a chemical fiber for clothing in which the uniform coating layer of the enzyme protein is formed on the surface of the single fiber without changing the internal structure of the single fiber of the chemical fiber.

[0030]

The present invention will be described in detail below with reference to examples, but the present invention is not limited to these examples.

Example 1 The specific surface area of fibers was calculated by the BET multipoint method by krypton adsorption. That is, as a measuring device, a high-precision fully automatic gas adsorption device BELSORP36 manufactured by Bell Japan
By using krypton (purity 99.995
%), And the dead volume is set to helium (purity 99.9999).
%), The adsorption temperature is 77 K, and the measurement range is relative pressure of 0.
It was set to 01 to 0.35 (measurement pressure / saturated vapor pressure of adsorbed gas). The equilibrium time was set to 180 seconds for each relative pressure, and the specific surface area based on the BET multimolecular adsorption theory was calculated by adsorption at an isothermal temperature. The specific surface area of the viscose rayon fabric (plain weave, manufactured by Teijin Ltd.) was 0.202 m ² / g.

As enzyme proteins, cellulases produced by Bacillus spp. (Microtechnology Research Institute No. 1485), cellulases produced by Trichoderma spp. (Meisserase TP-6).
0, manufactured by Meiji Seika Co., Ltd.), and amylase produced by Bacillus spp. Soxhlet extraction was performed for 6 hours using the above viscose rayon cloth as the recycled fiber and using a mixed solvent of chloroform: methanol = 1: 1 for removing the oil agent.

The buffer used was a 100 mM acetic acid-sodium acetate buffer (pH 5.0) (special grade manufactured by Wako Pure Chemical Industries), and the ionic strength was adjusted to 0.1.

First, the enzyme protein was diluted in a buffer solution. The protein concentration was in the range of 0 to 1 g / l in terms of bovine serum albumin conversion value of protein quantitative value by the Lowry method. The fiber was then dipped into the protein solution. 50 g of the fiber was added to 1 liter of the solution so that the whole fiber was immersed in the solution. The temperature of the solution was 5 ° C., and the solution was soaked while shaking until equilibrium adsorption was reached. The adsorption isotherm is shown in FIG. 1 (a cellulase produced by Bacillus as a representative example). As a result of plotting the adsorption isotherms, the following values were obtained as the equilibrium adsorption amount of the enzyme proteins Bacillus cellulase, Trichoderma cellulase and Bacillus amylase to the viscose rayon cloth.

[0035]

[Table 1]

Next, as the cross-linking agent, an aldehyde cross-linking agent glutaraldehyde (about 5% solution, manufactured by Wako Pure Chemical Industries,
First grade), represented by the following formula (1), and having an average molecular weight of about 100:
0, an epoxy-based crosslinking agent polyglycerol polyglycidyl ether having an average epoxy equivalent of 172 (Denacol E
X-521, manufactured by Nagase Kasei Co., Ltd.) was diluted in acetic acid-sodium acetate buffer to 100 mM, and 50 g of the fiber to which the enzyme protein had been adsorbed was added to 1 liter of the cross-linking agent diluting solution and immersed.

[0037]

Embedded image

The glutaraldehyde solution was shaken at 20 ° C. for 1 hour to carry out a crosslinking reaction. The Denacol EX-521 solution was heated within 20 minutes from 20 ° C to 90 ° C and shaken for 1 hour to carry out the reaction. After cross-linking treatment, wash thoroughly with water,
Dried.

Cellulase produced by Bacillus is adsorbed on the viscose rayon cloth, and after reaching adsorption equilibrium,
Using glutaraldehyde (100 mM) as a cross-linking agent,
After carrying out the crosslinking reaction at room temperature for 1 hour, the cellulase produced by Bacillus sp. Was adsorbed on the viscose rayon cloth of the present invention, and Denacol EX-521 was used as the crosslinking agent.
(100 mM) was used for cross-linking reaction at 90 ° C. for 1 hour to give Example 2 of the present invention, viscose rayon cloth which did not adsorb and cross-link enzyme protein was used as Comparative Example 1, and cellulase produced by Bacillus sp. After adsorbing to the course rayon cloth and reaching the adsorption equilibrium, water washing was thoroughly performed and the dried product was adsorbed on the viscose rayon cloth to which cellulase produced by Comparative Example 2 Bacillus was adsorbed to reach the adsorption equilibrium. After that, it was heated at 90 ° C. for 1 hour, washed sufficiently with water, and dried to obtain Comparative Example 3.

In order to examine the texture and feel of the fiber after home washing, the degree of fibrillation suppression, and the stability of the coating layer, home washing was performed using a model detergent having the composition shown in Table 2.

[0041]

[Table 2]

The detergent was dissolved in tap water to a concentration of 0.0833% (w / v), the bath ratio with the fiber was 1:30, and 20 ° C.
Wash with a home washing machine (Shizu Gozen, Hitachi) for 12 minutes, 5
After rinsing for a minute, dehydration and drying were performed. This washing was repeated 20 times.

A sensory evaluation of the texture and touch was made, and 1 washes
The following criteria were used to judge that the cloth that was not washed again was before washing and the cloth that was repeatedly washed 20 times was after washing. The results are shown in Table 3.

(Criteria for Sensory Evaluation) A: Good compared with Comparative Example 1 before washing. (Triangle | delta): It is equivalent to the comparative example 1 before washing. X: Inferior to Comparative Example 1 before washing.

The surface of the single fiber of the cloth was observed with a scanning electron microscope, the degree of occurrence of fibrillation was judged according to the following criteria, and the effect of suppressing fibrillation was examined. The observation is
A cloth sample was subjected to a sputtering treatment with platinum palladium, and a field emission scanning electron microscope (FE-SEM S-4 was used.
00, manufactured by Hitachi) at an acceleration voltage of 5 kV. The results are shown in Table 3.
Shown in

(Criteria for Occurrence of Fibrillation) A: No fibril is observed on the surface of the single fiber. Δ: Slight fibrils are observed on the surface of the single fiber. X: A considerable amount of fibrils are observed on the surface of the single fiber.

The stability of the coating layer formed by the adsorption and cross-linking of the enzyme protein on the surface of the monofilament against washing is determined by using Coomassie Brilliant Blue for protein staining (Quick CBB for electrophoresis, manufactured by Wako Pure Chemical Industries) before and after washing. Was stained, and the residual property of the protein was determined by the difference in the degree of staining, and the result was evaluated according to the following criteria. The results are shown in Table 3.

(Criteria for judging stability of the coating layer against washing) ⊚: It is equivalent to the dyeability of the cloth before washing. ◯: Slightly inferior to the dyeability of the cloth before washing. Δ: considerably inferior to the dyeability of the cloth before washing. X: No dyeability (equivalent to the degree of dyeing before washing in Comparative Example 1).

[0049]

[Table 3]

Similar results were obtained when the cellulase produced by Trichoderma and the amylase produced by Bacillus were used.

From the invention examples 1 and 2, the texture of recycled fiber
Feel is not lost before and after washing. The coating layer that adsorbs enzyme protein on the surface of single fiber is stable against washing,
It is considered that the coating layer suppresses the generation of fibrils to prevent fuzzing and hardening of the fibers, and the texture and touch are not impaired.

Example 2 The same process as in Example 1 was performed. Soxhlet extraction was performed for 6 hours using a polyester cloth (Palace plain weave, manufactured by Asahi Kasei) as the synthetic fiber and a mixed solvent of chloroform: methanol = 1: 1 for removing the oil. The specific surface area of the polyester cloth calculated using the BET multipoint method by krypton adsorption was 0.205 mg / m ² .

The adsorption isotherm of the enzyme protein on the polyester cloth is shown in FIG. 2 (a cellulase produced by Bacillus as a representative example). From the results of plotting the adsorption isotherm,
The following values were obtained as the equilibrium adsorption amounts of the enzyme proteins Bacillus cellulase, Trichoderma cellulase, and Bacillus cellulase amylase onto the polyester fabric.

[0054]

[Table 4]

Cellulase produced by Bacillus was adsorbed on a polyester cloth, and after reaching equilibrium adsorption, glutaraldehyde (100 mM) was used as a cross-linking agent to carry out a cross-linking reaction at room temperature for 1 hour. , Cellulase produced by Bacillus spp. Was adsorbed onto polyester cloth, and after reaching equilibrium adsorption, Denacol E was used as a cross-linking agent.
X-521 (100 mM, 90 ° C. for 1 hour) was subjected to a cross-linking reaction, and Example 4 of the present invention was prepared. A polyester cloth that did not adsorb enzyme protein and was not cross-linked was Comparative Example 4, cellulase produced by Bacillus sp. Adsorb on polyester cloth,
After reaching the adsorption equilibrium, the product was thoroughly washed with water and dried, and then cellulase produced by a Bacillus bacterium was adsorbed onto the polyester cloth, and after reaching the adsorption equilibrium, 90 ° C was reached.
Comparative Example 6 was prepared by heating for 1 hour, thoroughly washing with water, and drying.

The same home laundering as in Example 1 was carried out, and the sensory evaluation of the texture was performed according to the following criteria as in Example 1. The results are shown in Table 5.

(Criteria for Sensory Evaluation) A: Good compared with Comparative Example 4 before washing. (Triangle | delta): It is equivalent to the comparative example 4 before washing. X: Inferior to Comparative Example 4 before washing.

The hygroscopicity of the fibers was evaluated by the following method. The measurement target fiber is placed in an atmosphere of 20 ° C. and 65% RH or 20
After maintaining the temperature at 90% RH for 2 hours, the weight was measured, and the measured value was taken as A. Then, the fiber whose weight after moisture absorption was confirmed was treated at 105 ° C. for 2 hours and dried completely. The weight was measured, this measured value was designated as B, and the moisture absorption rate was calculated from the following equation. The results are shown in Table 4.

[0059]

(2) Moisture absorption rate (%) = (A−B) / B × 100

The stability of the coating layer formed by adsorption and cross-linking of the enzyme protein on the surface of the monofilament against washing is determined by dyeing the cloth before and after washing with Coomassie Brilliant Blue, which is a dye for protein dyeing. Persistence was judged according to the following criteria. The results are shown in Table 5.

(Criteria for judging stability of coating layer against washing) A: Same as dyeability of cloth before washing. ◯: Slightly inferior to the dyeability of the cloth before washing. Δ: considerably inferior to the dyeability of the cloth before washing. X: No dyeability (equivalent to the degree of dyeing before washing in Comparative Example 4).

[0062]

[Table 5]

Similar results were obtained using the cellulase produced by Trichoderma and the amylase produced by Bacillus.

From the invention examples 3 and 4, the texture of synthetic fiber
It can be seen that the feel is improved. It is considered that this is because the texture and touch were improved by improving the hygroscopicity of the synthetic fiber by forming the coating layer by adsorbing the enzyme protein on the surface of the single fiber. Further, since the coating layer is stable to washing, it is expected that these properties will be maintained for a long period of time.

[Brief description of drawings]

FIG. 1 is a graph showing the relationship between the protein concentration and the amount of enzyme protein adsorbed in Example 1 of the present invention.

FIG. 2 is a graph showing the relationship between the protein concentration and the amount of enzyme protein adsorbed in Example 2 of the present invention.

Claims (6)

[Claims] 1. A chemical fiber for clothing, wherein a coating layer made of an enzyme protein cross-linked by a cross-linking agent is formed on the surface of a single fiber of the chemical fiber. 2. The chemical fiber for clothing according to claim 1, wherein the enzyme protein forming the coating layer is one kind or two or more kinds having a molecular weight of 10,000 or more. 3. The chemical fiber for clothing according to claim 1, wherein the single fiber of the chemical fiber is viscose rayon, polyester, acrylic or nylon. 4. A chemistry for clothing, characterized in that a chemical fiber is immersed in a solution containing an enzyme protein to adsorb the enzyme protein on the surface of a monofilament of the fiber, and then the enzyme protein is crosslinked with a crosslinking agent. Fiber manufacturing method. 5. The method for producing chemical fiber for clothing according to claim 4, wherein the pH of the solution containing the enzyme protein is in the acidic or neutral range. 6. The method for producing a chemical fiber for clothing according to claim 4 or 5, wherein the amount of the enzyme protein adsorbed to the monofilament of the chemical fiber is 3 to 15 mg / m ² per fiber surface area.