JP2010024586A - Regenerated collagen-based artificial hair fiber - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To obtain regenerated collagen-based artificial hair fiber suppressed in gloss and excellent in volume without spoiling touch feeling of the regenerated collagen fiber which is extremely close to that of human hair. <P>SOLUTION: The regenerated collagen-based artificial hair fiber has at least one of a cross sectional shape selected from the group consisting of a Y-shape, an S-shape, a C-shape, a cocoon shape, quadri-lobal to octo-lobal shapes, and a shape of ≠, wherein regenerated collagen-based fiber contains a monofunctional epoxy compound and a metal aluminum salt. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a regenerated collagen-based artificial hair fiber having natural luster close to human hair and excellent in volume.

  Regenerated collagen fibers have been applied to various fields in the past because protein fibers exhibit high strength like silk. In particular, the regenerated collagen fiber is a protein fiber that retains a characteristic molecular structure derived from collagen. ing. For this reason, attempts have been made to use animal hair-like fibers for hair and fur (for example, Patent Documents 1 and 2). In general, the cross-sectional shape of human hair is an ellipse with a ratio of the short axis to the long axis of 1: 1 to 1: 1.75. However, fibers made of regenerated collagen and having a cross-sectional shape similar to human hair are human hair. Unlike the current situation, it cannot be said that it has a strong gloss and a natural appearance.

  In addition, in order to obtain light-colored fibers in protein-based fibers using natural raw materials, it is necessary to improve the purity of the raw materials or to produce fibers using a non-colored crosslinking agent. The resulting fibers have a strong transparency compared to human hair and tend to be too glossy (Patent Document 3).

When a matting operation is performed in order to suppress gloss, addition of a matting agent such as a metal compound is generally performed. However, addition of a matting agent of a metal compound in a protein material having many reactive groups is performed by spinning. There is a problem that a cross-linking reaction between protein molecules occurs in the undiluted solution, and the spinning undiluted solution gels and cannot be fibrillated.
JP-A-10-168628 JP-A-10-168629 WO01 / 006045

  An object of the present invention is to provide artificial hair with excellent gloss and volume, which has been a problem with conventional regenerated collagen fibers.

  As a result of intensive studies to solve the above problems, the present inventors have found that gloss and volume feeling can be improved by having clear concave portions in the fiber cross section, and have completed the present invention.

That is, the present invention
Regenerated collagen-based artificial hair fibers characterized by having at least one cross-sectional shape selected from the group consisting of Y-shape, S-shape, C-shape, collar shape, 4-8 leaf shape, and key shape. 1),
The regenerated collagen fiber for artificial hair according to claim 1, wherein the regenerated collagen fiber contains a monofunctional epoxy compound and a metal aluminum salt (claim 2),
The monofunctional epoxy compound is a monofunctional epoxy compound represented by the following general formula (1), and relates to a fiber for regenerated collagen-based artificial hair according to claim 2 (claim 3),
The regenerated collagen fiber for artificial hair according to any one of claims 1 to 3, wherein the regenerated collagen fiber is crosslinked with a metal aluminum salt (claim 4),
An artificial hair comprising the regenerated collagen-based artificial hair fiber according to any one of claims 1 to 4 (claim 5),
Is.

  ADVANTAGE OF THE INVENTION According to this invention, the fiber for collagen type artificial hair excellent in gloss and volume can be obtained.

  The fiber for artificial hair of the present invention has at least one cross-sectional shape selected from a Y shape, an S shape, a C shape, a cocoon shape, a 4-8 leaf shape, and a key shape.

  A typical Y-shape is shown in FIG. In FIG. 1, the ratio of q / p is not particularly limited, but is usually q / p = 0.3 to 8 from the viewpoint of the feel of the fiber, strength, and spinnability. Further, the angles (α, β, γ) formed by the protrusions are not particularly limited.

  Representative examples of the S shape are shown in FIGS. 2 (2-1), (2-2), and (2-3). What is necessary is just to have an S-shape, and the thickness a in FIGS. 2 (2-1), (2-2), and (2-3) is not particularly limited.

  A typical C-shape is shown in FIG. Although it is sufficient if the C-shape is formed, it is preferable that the length b of the opening in FIG. 3 is large because the C-shape is easily retained. When it becomes too small, it approaches a hollow circular shape, which is not preferable from the viewpoint of gloss suppression. The relationship between the outer diameters c and b shown in FIG. 3 is not particularly limited, but b / c = 0.05 to 0.8 is preferable from the above viewpoint.

  A substitute for the saddle shape is shown in FIG. The saddle shape is a concatenation of elliptical or oval shapes. In FIG. 4, the length d of the bowl shape and the length e of the hollow portion are not particularly limited, but e / d = 0.2 to 0.95 is preferable from the viewpoint of gloss and touch.

  Representative examples of 4 to 8 leaf shapes are shown in FIGS. 5 (5-1), (5-2), (5-3), (5-4), and (5-5). From the viewpoint of tactile sensation, L / W in the 4-8 leaf shape is preferably L / W = 0.3-3.

  A typical key shape is shown in FIG. However, since f (or g, h, i) is too large with respect to j in FIG. ) / J = 3 to 0.2 is preferable.

  The collagen raw material used in the present invention is preferably a fresh skin obtained from animals such as cattle or a portion of the skin obtained from salted raw skin. Most of these skins are made of insoluble collagen fibers.

  This insoluble collagen fiber contains impurities such as lipids, glycoproteins, and proteins other than collagen, so it has a great influence on spinning stability, quality such as gloss and strength, and odor. Therefore, for example, after leaching with lime, the fat content in insoluble collagen fibers is hydrolyzed, the collagen fibers are unraveled, and then conventional leather treatment such as acid / alkali treatment, enzyme treatment, solvent treatment, etc. is performed. It is preferable to remove these impurities in advance.

  The insoluble collagen subjected to the treatment as described above is subjected to a solubilization treatment in order to cleave the cross-linked peptide portion. As such a solubilization method, a publicly-known publicly known alkali solubilization method, enzyme solubilization method or the like can be applied.

  When the solubilized collagen is further subjected to operations such as pH adjustment, salting out, water washing and solvent treatment, it is possible to obtain regenerated collagen with excellent quality and so on. It is preferable to perform the treatment.

  Next, the obtained solubilized collagen skin is prepared by, for example, using an acid solution adjusted to pH 2 to 4.5 with an acid such as hydrochloric acid, acetic acid, or lactic acid so as to be a stock solution having a predetermined concentration of about 1 to 15% by weight. It is dissolved by using a collagen aqueous solution.

  The resulting solubilized collagen aqueous solution contains, for example, a stabilizer, a high water-solubility for the purpose of improving mechanical strength, improving water resistance / heat resistance, improving gloss, improving spinnability, preventing coloring, and preserving. An appropriate amount of additives such as molecular compounds may be blended.

  Next, the solubilized collagen aqueous solution is discharged through, for example, a spinning nozzle or a slit and immersed in an inorganic salt aqueous solution such as sodium sulfate, sodium chloride, ammonium sulfate having a pH of 2 to 13, thereby forming regenerated collagen fibers.

  When the pH is less than 2 or exceeds 13, the peptide bond of collagen tends to be subject to hydrolysis, and the intended fiber tends to be difficult to obtain. The temperature of the inorganic salt aqueous solution is not particularly limited, but it is usually preferably 35 ° C. or lower. When this temperature is higher than 35 ° C., the soluble collagen is denatured, the strength of the spun fiber is lowered, and it becomes difficult to produce a stable yarn. The lower limit of the temperature is not particularly limited, and may be appropriately adjusted according to the solubility of the inorganic salt.

The free amino group of the collagen is modified with an alkyl group having 2 to 20 carbon backbones having a hydroxyl group or an alkoxy group at the β-position or γ-position. The carbon teaching main chain indicates a continuous carbon chain of an alkyl group bonded to an amino group, and the number of carbons existing through other atoms is not considered. As a reaction for modifying a free amino group, a conventionally known alkylation reaction of an amino group can be used. The C2-C20 alkyl group having a hydroxyl group or an alkoxy group at the β-position is preferably a compound represented by the following general formula (2) because of reactivity, ease of treatment after the reaction, and the like.
—CH ₂ —CH (OX) —R (2)
(Formula A, R represents a substituent represented by R ¹ —, R ² —O—CH ₂ — or R ² —COO—CH ₂ —, and R ¹ in the substituent has 2 to 20 carbon atoms. The following hydrocarbon groups or CH ₂ Cl, R ² represents a hydrocarbon group having 4 to 20 carbon atoms, and X represents hydrogen or a hydrocarbon group.)
Preferable examples of the general formula (2) include a glycidyl group, a 1-chloro-2-hydroxypropyl group, and a 1,2-dihydroxypropyl group. In addition, a structure in which a glycidyl group is added to a free amino group in collagen can be mentioned. Furthermore, a structure in which the epoxy compound used is subjected to ring-opening addition and / or ring-opening polymerization starting from the hydroxyl group contained in the alkyl group described in the above-mentioned preferred group can be mentioned. Examples of the terminal structure include those having the aforementioned alkyl group structure.

  Examples of amino acids constituting the free amino group of the regenerated collagen include lysine and hydroxylysine. Furthermore, although the amino acid that originally constitutes collagen is arginine, the amino group of ornithine, which is produced by partial hydrolysis during the hydrolysis under alkaline conditions to obtain the regenerated collagen, is also present. Alkylation reaction is performed. In addition, the reaction proceeds with a secondary amine contained in histidine.

  The modification rate of the free amino group can be measured by amino acid analysis, and calculated based on the amino acid analysis value of the regenerated collagen fiber before the alkylation reaction or the known composition of the free amino acid constituting the collagen used as the raw material Is done. In the modification of the amino group in the present invention, the structure modified with an alkyl group having 2 or more carbon atoms having a hydroxyl group or an alkoxy group at the β-position or γ-position may be 50% or more of the free amino group. The other part may be a free amino group or a structure modified with another substituent. The modification rate of the free amino acid in the regenerated collagen needs to be 50% or more, more preferably 65% or more, and still more preferably 80% or more. When the reaction rate is low, good characteristics cannot be obtained due to heat resistance.

  Here, in the modification of the free amino group, one molecule of an alkylating agent usually reacts with respect to one free amino group. Of course, two or more molecules may react. Furthermore, an intramolecular or intermolecular cross-linking reaction may exist via a hydroxyl group, an alkoxy group or other functional group present at the β-position or γ-position of the alkyl group bonded to the free amino group. . Specific examples of the alkylation reaction include an addition reaction of an epoxy compound, an addition reaction of a hydroxyl group or an aldehyde compound having this derivative at the α-position or β-position and a subsequent reduction reaction, a hydroxyl group at the β-position or γ-position. Alternatively, a substitution reaction such as a halogenated compound having 2 or more carbon atoms having an alkoxy group, an alcohol, and an amine is exemplified, but the invention is not limited thereto.

  In the present invention, examples of the organic compound that can be used as the alkylating reagent include aldehydes, epoxies, and phenol derivatives. Of these, a modification reaction with an ethoxy compound is preferred because of its excellent reactivity and processing conditions, since it exhibits excellent characteristics. A monofunctional ethoxy compound is particularly preferred.

Specific examples of the monofunctional epoxy compound used here include ethylene oxide and propylene oxide. Olefin oxides such as butylene oxide, isobutylene oxide, octene oxide, styrene oxide, methyl styrene oxide, epichlorohydrin, epibromohydrin, glycidol, glycidyl methyl ether, butyl glycidyl ether, octyl glycidyl ether, nonyl glycidyl ether, Undecyl glycidyl ether, tridecyl glycidyl ether, pentadecyl glycidyl ether, 2-ethylhexyl glycidyl ether, allyl glycidyl ether, phenyl glycidyl ether, cresyl glycidyl ether, t-butylphenyl glycidyl ether, dibromophenyl glycidyl ether, benzyl glycidyl ether Glycidyl ethers such as polyethylene oxide glycidyl ether, glycidyl formate, glycidyl acetate Le, glycidyl esters such as glycidyl acrylate, glycidyl methacrylate, glycidyl benzoate, although glycidyl amides and the like, are not limited only to those exemplified.

  Among monofunctional epoxy compounds, since the water absorption rate of regenerated collagen decreases, it is preferable to treat with a monofunctional epoxy compound represented by the following general formula (1).

R represents a substituent represented by R ₁ —, R ₂ —O—CH ₂ — or R ₂ —COO—CH ₂ —, and R ₁ represents a hydrocarbon group having 2 to 20 carbon atoms or CH _2. Cl and R ₂ represents a hydrocarbon group having 4 to 20 carbon atoms.

  The regenerated collagen thus obtained is swollen with water or an aqueous solution of an inorganic salt. The swollen body preferably contains 4 to 15 times the weight of regenerated collagen and contains an aqueous solution of water or an inorganic salt. If the content of the aqueous solution of water or inorganic salt is 4 times or more, the aluminum salt content in the regenerated collagen is large, so the water resistance is sufficient. Moreover, if it is 15 times or less, intensity | strength does not fall and handleability is favorable.

The swollen regenerated collagen fibers are then immersed in an aqueous solution of an aluminum salt. The aluminum salts of the aluminum salt aqueous solution, the following _{formula, Al (OH) n Cl 3} -n, or _{Al 2 (OH) 2n (SO} 4) 3 - n, ( wherein, n 0.5-2 .5) is preferred. Basic aluminum chloride or basic aluminum sulfate represented by Specifically, for example, aluminum sulfate, aluminum chloride, alum or the like is used. These aluminum can be used individually or in mixture of 2 or more types. The aluminum salt concentration of the aluminum salt aqueous solution is preferably 0.3 to 5% by mass in terms of aluminum oxide. When the concentration of the aluminum salt is 0.3% by mass or more, the content of the aluminum salt in the regenerated collagen fiber is high and the water resistance is sufficient. Moreover, if it is 5 mass% or less, it will not be so hard after a process, and handleability will be favorable.

  The pH of the aluminum salt aqueous solution is usually adjusted to 2.5 to 5 using, for example, hydrochloric acid, sulfuric acid, acetic acid, sodium hydroxide, sodium carbonate or the like. If this pH is 2.5 or more, the structure of collagen can be maintained well. If pH is 5 or less, precipitation of aluminum salt does not occur, and it becomes easy to penetrate uniformly. This pH is initially adjusted to 2.2 to 3.5, and the aluminum salt aqueous solution is sufficiently permeated into the regenerated collagen, and then added with, for example, sodium hydroxide, sodium carbonate, etc. It is preferable to adjust to 5 to complete the treatment. When a highly basic aluminum salt is used, only the first pH adjustment of 2.5 to 5 may be used. Moreover, the liquid temperature of this aluminum salt aqueous solution is although it does not specifically limit, 50 degrees C or less is preferable. If the liquid temperature is 50 ° C. or lower, the regenerated collagen is hardly denatured or altered.

  The time for immersing the regenerated collagen in this aluminum salt aqueous solution is 3 hours or more, preferably 6 to 25 hours. If the immersion time is 3 hours or longer, the reaction of the aluminum salt proceeds, and the aqueous solution of regenerated collagen becomes sufficient. Moreover, although there is no restriction | limiting in particular in the upper limit of immersion time, reaction of aluminum salt will fully advance within 25 hours, and water resistance will also become favorable. In order to prevent the aluminum salt from being rapidly absorbed into the regenerated collagen and causing temperature unevenness, an inorganic salt such as sodium chloride, sodium sulfate, or potassium chloride may be appropriately added to the aqueous solution of the aluminum salt.

  In this invention, it is preferable to process so that the aluminum content contained in the fiber after completion | finish of processing may be 1-10 mass%. A more preferable range is 3 to 9% by mass. When the aluminum content is less than 1% by mass, the wet feeling tends to be poor. Moreover, when it exceeds 10 mass%, the fiber after a process will become hard and there exists a tendency for a texture to be impaired.

  The regenerated collagen fiber thus treated with the aluminum salt is then washed, oiled and dried. The washing with water can be performed, for example, by washing with running water for 10 minutes to 4 hours. As an oil agent used for oiling, for example, an oil agent composed of an emulsion such as amino-modified silicone, epoxy-modified silicone, or polyether-modified silicone, and a pluronic polyether-based antistatic agent can be used. The drying temperature is preferably 100 ° C. or less, more preferably 75 ° C. or less, and the load during drying is 0.01 to 0.25 g, preferably 0.02 to 0.15 g based on 1 dtex. Is preferred.

  Here, washing with water prevents oil from precipitating due to salt, or salt is precipitated from the regenerated collagen fiber during drying in the dryer, and the regenerated collagen fiber is broken by such salt, This is to prevent the heat transfer coefficient from decreasing due to scattering in the dryer and adhering to the heat exchanger in the dryer. In addition, when oiling is applied, it is effective in preventing fiber sticking and improving surface properties during drying.

  Further, when spinning a collagen solution, it can be colored by mixing pigments or dyes in the solution or immediately before spinning (original deposition method). The pigments and dyes to be used can be selected in accordance with the application without any elution separation in the spinning process and according to the required quality of the product used. Moreover, a filler, an anti-aging agent, a flame retardant, an antioxidant, etc. can also be added as needed.

  The fineness of the regenerated collagen fiber thus produced is preferably 30 dtex to 90 dtex because it is used for hair. When it is less than 30 dtex, the combing property is deteriorated, which is not preferable for hair. On the other hand, if it is larger than 90 dtex, it is not preferable because it is too thick for hair and does not exhibit a natural appearance.

  The regenerated collagen fiber thus obtained has gloss and volume similar to human hair while maintaining the texture of natural protein fiber, and can be more suitably used as a substitute for human hair.

  The regenerated collagen-based artificial hair fiber of the present invention may be a combination of fibers having a plurality of cross-sectional shapes. The fibers having a plurality of cross-sectional shapes may be Y-shaped, S-shaped, C-shaped, cocoon-shaped, 4- to 8-leaf-shaped, or K-shaped fibers, and may be Y-shaped, S-shaped, C-shaped, cocoon-shaped, Other cross-sectional fibers may be included as long as at least one cross-sectional shape selected from the group consisting of 4 to 8 leaf shapes and key shapes is included. The other cross-sectional fibers in the regenerated collagen-based artificial hair fibers refer to fiber cross-sections used as artificial hair fibers such as ellipse, circle, and triangle.

  The regenerated collagen-based artificial hair fiber of the present invention may be mixed with other synthetic fibers or human hair fibers. Examples of other synthetic fibers include acrylic fibers, vinyl chloride fibers, modacrylic fibers, polyester fibers, polyamide fibers, and polyolefin fibers.

  The artificial hair of the present invention includes the regenerated collagen fiber of the present invention and is used for hair accessories such as wigs, two-pieces, blades, extensions and weaving, doll hairs, and the like.

  EXAMPLES Next, the present invention will be specifically described with reference to examples, but the present invention is not limited to such examples.

The characteristic evaluation method is as follows.
(Glossy)
A tow having a length of 30 cm and a total fineness of 100,000 dtex is evaluated visually under sunlight.

  A: Gloss equivalent to human hair.

  B: Gloss is slightly stronger than human hair.

  C: Gloss is stronger than human hair.

D: Gloss is much stronger than human hair.
(volume)
A 10 cm long, 7 g fiber was weighed and closely packed with an insulation lock, and then the area of the cross section was determined.

A: Cross-sectional area 0.62 cm ² or more (there is more volume than human hair)
B: 0.60 cm ² or more and less than 0.62 cm ² (there is a volume comparable to human hair)
C: 0.58 cm ² or more to less than 0.60 cm ² (volume is inferior to human hair)
D: Less than 0.58 cm ² (volume is considerably inferior to human hair)
(Feel)
A: Tactile sensation equivalent to human hair.

  B: Soft touch but slightly inferior to human hair.

  C: Tactile inferior to human hair.

D: A feeling of harshness is strong, and the touch is far from human hair.
Example 1
30 g of hydrogen peroxide solution diluted to 30% by weight was added to 1200 g of skin sliced with alkali (180 g of collagen) using cow's floor skin as a raw material, and then dissolved in lactic acid aqueous solution, pH 3.5, solid content 7 A stock solution adjusted to 5% by weight was prepared. The stock solution was subjected to stirring and defoaming treatment with a stirring deaerator (manufactured by Dalton Co., Ltd., 8DMV type) under reduced pressure, transferred to a piston-type spinning stock solution tank, and further allowed to stand under reduced pressure for defoaming. After extruding the stock solution with a piston, the gear pump was fed in a fixed amount, filtered through a sintered filter having a pore diameter of 10 μm, passed through a spinning nozzle having a cross-sectional shape and a pore diameter of 0.5 mm, a hole length of 0.5 mm, and a hole number of 300, It was discharged at a spinning speed of 5 m / min into a 25 ° C. coagulation bath (adjusted to pH 11 with boric acid and sodium hydroxide) containing 20% by weight of sodium sulfate.
Next, the obtained regenerated collagen fiber (300 fibers, 20 m) was converted into epichlorohydrin 1.7.
After dipping in 1.32 kg of an aqueous solution containing 10% by weight of sodium hydroxide, 0.0246% by weight of sodium hydroxide and 17% by weight of sodium sulfate at 25 ° C. for 4 hours, the reaction solution temperature was further raised to 43 ° C. and impregnation for 2 hours did.

  After the reaction was completed, the reaction solution was removed, and then washed with water three times using 1.32 kg of 25 ° C. water in a fluid type apparatus. Thereafter, it was impregnated with 1.32 kg of an aqueous solution containing 5% by weight of aluminum sulfate, 0.9% by weight of trisodium citrate, and 1.2% by weight of sodium hydroxide at 30 ° C. After 5 hours and 4 hours, 13.2 g of a 5% by weight aqueous sodium hydroxide solution was added to the reaction solution and reacted for a total of 6 hours. After the reaction was completed, the reaction solution was removed, and then washed with water three times using 1.32 kg of 25 ° C. water in a fluid type apparatus.

Next, a part of the prepared fiber was immersed in a bath filled with an oil agent comprising an amino-modified silicone emulsion and a pluronic polyether-based antistatic agent to adhere the oil agent. One end of a fiber bundle is fixed inside a hot air convection dryer set to 50 ° C., and a weight of 2.8 g is hung from one fiber on the other end, dried under tension for 2 hours, and then measured. Carried out. The evaluation results are shown in Table 1. Moreover, the cross-sectional photograph of the obtained fiber is shown in FIG. 19 (Examples 2-6 and Comparative Examples 1-3).
As in Example 1, regenerated collagen fibers were prepared and evaluated using the spinning nozzles shown in FIGS. The evaluation results are shown in Table 1. Moreover, the cross-sectional photograph of the obtained fiber is shown in FIGS.
(Comparative Example 4)
A copolymer consisting of 49% by weight of acrylonitrile, 50% by weight of vinyl chloride and 1% by weight of sodium styrenesulfonate was dissolved in acetone to prepare a 28.5% by weight spinning dope. This stock solution was spun into a 25% by weight acetone aqueous solution using a Y-shaped spinning nozzle (number of holes = 50) shown in FIG. 17, stretched 1.5 times in a 65 ° C. hot water bath, and then 120 ° C. After drying, the film was stretched 1.8 times and further subjected to relaxation heat treatment (0.92 times) at 160 ° C. to produce a modacrylic fiber having a single yarn fineness of 50 dtex. The evaluation results are shown in Table 1. Moreover, the cross-sectional photograph of the obtained fiber is shown in FIG.
(Comparative Examples 5 and 6)
Similarly to Comparative Example 4, modacrylic fibers were produced using the spinning nozzles shown in FIGS. The evaluation results are shown in Table 1. Moreover, the cross-sectional photograph of the obtained fiber is shown to FIG. 32, FIG.

As shown in Table 1, it can be seen that Examples 1 to 8 are superior in gloss and volume as compared with Comparative Examples 1 to 3. Moreover, it turns out that Example 1, 2, 7, 8 is excellent in tactile sense compared with Comparative Examples 4-6. Therefore, the regenerated collagen-based artificial hair fiber having a clear recess on the fiber cross section is a fiber for artificial hair with improved gloss and volume without impairing the natural touch that is characteristic of the regenerated collagen-based artificial hair fiber. It can be used.

FIG. 1 is a cross-sectional explanatory view of a Y-shaped regenerated collagen fiber according to the present invention. (2-1) is an S-shaped cross-sectional view of the regenerated collagen fiber in the present invention. (2-2) is an S-shaped cross-sectional view of the regenerated collagen fiber in the present invention. (2-3) is the S of the regenerated collagen fiber in the present invention. Characteristic cross-sectional illustration FIG. 3 is an S-shaped cross-sectional view of the regenerated collagen fiber in the present invention. FIG. 4 is a cross-sectional explanatory view of a regenerated collagen fiber according to the present invention. (5-1) is a cross-sectional explanatory view of the regenerated collagen fiber according to the present invention. (5-2) is a cross-sectional explanatory view of the regenerated collagen fiber according to the present invention. (5-3) is a regenerated collagen fiber according to the present invention. (5-4) is a 7-leaf cross-sectional explanatory view of the regenerated collagen fiber in the present invention. (5-5) is an 8-leaf cross-sectional explanatory view of the regenerated collagen fiber in the present invention. FIG. 6 is an explanatory diagram of a cross section of a regenerated collagen fiber according to the present invention. FIG. 7 is an explanatory diagram of the nozzle shape used in Example 1 of the present invention. FIG. 8 is an explanatory diagram of the nozzle shape used in Example 2 of the present invention. FIG. 9 is an explanatory diagram of the nozzle shape used in Example 3 of the present invention. FIG. 10 is an explanatory diagram of the nozzle shape used in Example 4 of the present invention. FIG. 11 is an explanatory diagram of the nozzle shape used in Example 5 of the present invention. FIG. 12 is an explanatory diagram of the nozzle shape used in Example 6 of the present invention. FIG. 13 is an explanatory diagram of the nozzle shape used in Example 7 of the present invention. FIG. 14 is an explanatory diagram of the nozzle shape used in Example 8 of the present invention. FIG. 15 is an explanatory diagram of the nozzle shape used in Comparative Example 2 of the present invention. FIG. 16 is an explanatory diagram of the nozzle shape used in Comparative Example 3 of the present invention. FIG. 17 is an explanatory diagram of the nozzle shape used in Comparative Example 4 of the present invention. FIG. 18 is an explanatory diagram of the nozzle shape used in Comparative Example 5 of the present invention. FIG. 19 is an explanatory diagram of the nozzle shape used in Comparative Example 6 of the present invention. FIG. 20 is a cross-sectional explanatory view of the regenerated collagen fiber obtained in Example 1 of the present invention. FIG. 21 is a cross-sectional explanatory view of the regenerated collagen fiber obtained in Example 2 of the present invention. FIG. 22 is a cross-sectional explanatory view of the regenerated collagen fiber obtained in Example 3 of the present invention. FIG. 23 is a cross-sectional explanatory view of a regenerated collagen fiber obtained in Example 4 of the present invention. FIG. 24 is a sectional explanatory view of the regenerated collagen fiber obtained in Example 5 of the present invention. FIG. 25 is a cross-sectional explanatory view of the regenerated collagen fiber obtained in Example 6 of the present invention. FIG. 26 is a cross-sectional explanatory view of the regenerated collagen fiber obtained in Example 7 of the present invention. FIG. 27 is a cross-sectional explanatory view of the regenerated collagen fiber obtained in Example 8 of the present invention. FIG. 28 is a cross-sectional explanatory view of a regenerated collagen fiber obtained in Comparative Example 1 of the present invention. FIG. 29 is a cross-sectional explanatory view of a regenerated collagen fiber obtained in Comparative Example 2 of the present invention. FIG. 30 is a cross-sectional explanatory view of the regenerated collagen fiber obtained in Comparative Example 3 of the present invention. FIG. 31 is a cross-sectional explanatory view of a regenerated collagen fiber obtained in Comparative Example 4 of the present invention. FIG. 32 is a cross-sectional explanatory view of a regenerated collagen fiber obtained in Comparative Example 5 of the present invention. FIG. 33 is a cross-sectional explanatory view of a regenerated collagen fiber obtained in Comparative Example 6 of the present invention.

Explanation of symbols

α Angle formed by the protruding portion of the Y-shaped cross section β Angle formed by the protruding portion of the Y-shaped cross section γ Angle formed by the protruding portion of the Y-shaped cross section p Length of the protruding portion of the Y-shaped cross section q Width of the protruding portion of the Y-shaped cross section a Width of S-shaped section b Length of opening of C-shaped section c Outer diameter of C-shaped section d Length of bowl-shaped section e Length of recess in bowl-shaped section f Length of protrusion of key-shaped section g Projection length of key section h Length of protrusion section of key section i Length of protrusion section of key section W Width of protrusion section of 4-8 leaf section L Projection of leaf section of L 4-8 Part height R Radius of the circular part of the vertical cross section

Claims (5)

  A fiber for regenerated collagen-based artificial hair, characterized by having at least one cross-sectional shape selected from the group consisting of Y-shape, S-shape, C-shape, cocoon shape, 4-8 leaf shape, and key shape.   The regenerated collagen fiber for artificial hair according to claim 1, wherein the regenerated collagen fiber contains a monofunctional epoxy compound and a metal aluminum salt. The fiber for regenerated collagen-based artificial hair according to claim 2, wherein the monofunctional epoxy compound is a monofunctional epoxy compound represented by the following general formula (1).
R represents a substituent represented by R ₁ —, R ₂ —O—CH ₂ — or R ₂ —COO—CH ₂ —, and R ₁ represents a hydrocarbon group having 2 to 20 carbon atoms or CH _2. Cl and R ₂ represents a hydrocarbon group having 4 to 20 carbon atoms.   The regenerated collagen-based artificial hair fiber according to any one of claims 1 to 3, wherein the regenerated collagen fiber is crosslinked with a metal aluminum salt.   Artificial hair containing the fiber for regenerated collagen type artificial hair according to any one of claims 1 to 4.