WO2021176829A1

WO2021176829A1 - Core-sheath composite fiber for artificial hair, headwear product including same, and production method for same

Info

Publication number: WO2021176829A1
Application number: PCT/JP2021/000047
Authority: WO
Inventors: 安友徳和
Original assignee: 株式会社カネカ
Priority date: 2020-03-03
Filing date: 2021-01-05
Publication date: 2021-09-10
Also published as: JPWO2021176829A1; US20220361611A1

Abstract

In one or more embodiments, the present invention relates to a core-sheath composite fiber for artificial hair which includes a core part and a sheath part, said core-sheath composite fiber for artificial hair being characterized by having a cross-section which is a flat two-lobed shape or an elliptical shape, and being characterized in that the ratio of core area to sheath area in a cross-section of the fiber is 3:7-8:2 (core : sheath), the sheath part is constituted by a polyamide-based resin composition containing a polyamide-based resin, and the core part has a cross-section which is a modified elliptical shape or a modified flat two-lobed shape having a pair protruding parts that protrude outwardly from the center along the short-axis direction of the cross-section of the fiber. Thus, provided are: a core-sheath composite fiber for artificial hair which has a texture similar to that of human hair, excellent comb-ability, and favorable curl setting properties; a headwear product including the same; and a production method for the same.

Description

Core-sheath composite fiber for artificial hair, headdress products containing it, and its manufacturing method

The present invention relates to a core-sheath composite fiber for artificial hair that can be used as a substitute for human hair, a headdress product containing the same, and a method for producing the same.

Human hair has traditionally been used in headdress products such as wigs, hair wigs, hair attachments, hair bands, and doll hair. However, in recent years, it has become difficult to obtain human hair, and there is a demand for artificial hair to replace human hair. It is increasing.

Such artificial hair is required to have a tactile sensation and appearance similar to human hair, and the synthetic fibers used as the material thereof include acrylic fibers, vinyl chloride fibers, vinylidene chloride fibers, polyester fibers, and polyamides. Examples include system fibers and polyolefin fibers. Among them, as a core-sheath composite fiber for artificial hair, which has a texture close to that of human hair and has excellent durability and heat resistance, a core-sheath composite fiber containing polyester as a core component and polyamide as a sheath component has been developed (patented). Document 1).

In Patent Document 1, by setting the viscosity ratio a / b of the melt viscosity a of polyester and the melt viscosity b of polyamide at 285 ° C. to 0.5 to 2.5, the durability and heat resistance of the core-sheath composite fiber for artificial hair are set. It is enhanced to sex.

International Publication No. 2017/187843

As described above, the fiber described in Patent Document 1 is a core-sheath composite fiber having polyester as a core component and polyamide as a sheath component, but the polyamide used as a sheath component is curled with a hair iron or the like. When this is done, the settability is worse than that of polyester, so that the curl settability is not sufficient as the core-sheath composite fiber for artificial hair, and further improvement is required.

The present invention provides a core-sheath composite fiber for artificial hair having a tactile sensation close to that of human hair and excellent combability, and also having good curl settability, a headdress product containing the same, and a method for producing the same.

In one or more embodiments, the present invention is a core-sheath composite fiber for artificial hair including a core portion and a sheath portion, and the core-sheath composite fiber for artificial hair has a flat bilobed or elliptical cross-sectional shape. The core-sheath ratio in the fiber cross section is an area ratio of core: sheath of 3: 7 to 8: 2, the sheath portion is composed of a polyamide-based resin composition containing a polyamide-based resin, and the core portion is A core-sheath composite fiber for artificial hair, which has a deformed flat bilobed shape or a deformed elliptical cross-sectional shape having a pair of convex portions protruding from the central side toward the outer peripheral side along the minor axis direction of the fiber cross section. Regarding.

The present invention also relates to a headdress product comprising the core-sheath composite fiber for artificial hair in one or more embodiments.

The present invention is also a method for producing a core-sheath composite fiber for artificial hair according to one or more embodiments, wherein the core resin composition and the sheath resin composition are melt-spun using a core-sheath type composite nozzle. The present invention relates to a method for producing a core-sheath composite fiber for artificial hair, which includes a step of making a core-sheath composite fiber.

The core-sheath composite fiber for artificial hair of the present invention not only has a tactile sensation close to that of human hair and excellent combability, but also has sufficiently excellent curl settability, and is suitable as a material for headdress products.

According to the production method of the present invention, it is possible to obtain a core-sheath composite fiber for artificial hair which not only has a tactile sensation close to that of human hair and excellent combability, but also has sufficiently excellent curl settability.

FIG. 1 is a schematic view showing a fiber cross section of a core-sheath composite fiber for artificial hair according to one or more embodiments of the present invention. FIG. 2 is a laser micrograph of a fiber cross section of the fiber of Example 1. FIG. 3 is a laser micrograph of a fiber cross section of the fiber of Comparative Example 1. FIG. 4 is a laser micrograph of a fiber cross section of the fiber of Comparative Example 3.

The present invention is an invention made to solve the above-mentioned problems of the prior art, that is, a core-sheath composite fiber for artificial hair having excellent curl settability (hereinafter, also simply referred to as "core-sheath composite fiber"). For the purpose of providing the above), it is difficult to obtain a core-sheath composite fiber for artificial hair having sufficiently excellent curl settability with a fiber having a core-sheath structure in which the core and the sheath (fiber) are similar to each other. It was found that a sufficiently excellent curl settability can be imparted by forming the fiber and the core portion into a specific cross-sectional shape.

(Shape of core-sheath composite fiber)
In one or more embodiments of the present invention, the core-sheath composite fiber for artificial hair has a flat bilobed or elliptical cross-sectional shape, preferably a flat bilobed cross-sectional shape. Further, the core portion is a deformed flat bilobed shape having a pair of convex portions protruding from the center side toward the outer peripheral side along the short axis direction of the fiber cross section, or the outer peripheral side from the center side along the short axis direction of the fiber cross section. It has a deformed elliptical cross-sectional shape with a pair of convex portions protruding toward, preferably a deformed flat bilobed cross-sectional shape.

A flat bilobed shape is a combination of two leaf shapes selected from the group consisting of a circular shape and an elliptical shape through a recess, and the circular or elliptical shape referred to here does not necessarily have to draw a continuous arc. It also includes a substantially circular or substantially elliptical shape that is partially deformed if it is not a sharp angle.

The deformed flat bilobed shape is a deformed flat bilobed shape, and is a flat bilobed shape having a pair of convex portions protruding from the central side toward the outer peripheral side along the minor axis direction of the fiber cross section. In the modified flat bilobed shape, the two leaf shapes selected from the circular and elliptical groups are connected via a concave portion, whereas in the modified flat bilobed shape, the two leaf shapes selected from the circular and elliptical groups are convex. It will be connected via.

Regarding the cross-sectional shape, the fibers derived from additives and the unevenness of 2 μm or less generated on the outer circumference of the core portion, which may be contained in the core-sheath composite fiber for artificial hair of the present invention, shall not be considered.

FIG. 1 is a schematic view showing a fiber cross section of a core-sheath composite fiber for artificial hair according to one or more embodiments of the present invention. The core-sheath composite fiber 1 for artificial hair of the embodiment includes a sheath portion 10 and a core portion 20, and the core-sheath composite fiber 1 for artificial hair is a flat bilobed shape in which two ellipses are connected via a recess. Has a cross-sectional shape of.

In the fiber cross section of the core-sheath composite fiber for artificial hair, the straight line having the maximum length is the long axis of the fiber cross section among the straight lines connecting arbitrary two points on the outer periphery of the fiber cross section so as to be parallel to the line symmetry axis and the line symmetry axis. The direction of the straight line and the direction parallel to it correspond to the long axis direction. Further, when connecting arbitrary two points on the outer periphery of the fiber cross section so as to be perpendicular to the long axis of the fiber cross section, the straight line connecting the two points having the maximum length corresponds to the short axis of the fiber cross section, and the straight line corresponds to the short axis of the fiber cross section. And the direction parallel to it correspond to the minor axis direction.

It is preferable that the length of the long axis of the fiber cross section (referred to as L) and the length of the short axis of the fiber cross section (referred to as S) satisfy the following formula (1).

L / S = 1.1 or more and 2.0 or less (1)

As shown in FIG. 1, the core portion 20 is a deformed flat bilobed shape having a pair of convex portions 30 protruding from the central side toward the outer peripheral side along the minor axis direction of the fiber cross section, and the two elliptical shapes are formed. It is connected via the convex portion 30. Alternatively, the core portion 20 can be said to be a deformed ellipse having a pair of convex portions 30 protruding from the center side toward the outer peripheral side along the minor axis direction of the fiber cross section.

In the core cross section, the length of the core cross section long axis, which is the maximum straight line among the straight lines connecting arbitrary two points on the outer circumference of the core cross section so as to be parallel to the line symmetry axis and the line symmetry axis ( Lc) and any two points on the outer circumference of the fiber cross section so as to be perpendicular to the long axis of the core cross section, the core cross section is a straight line connecting the two points that have the maximum length. It is preferable that the length of the minor axis (referred to as Sc) satisfies the following equation (2).

Lc / Sc <L / S (2)

In one or more embodiments of the present invention, the core-sheath composite fiber for artificial hair has a flat bilobed fiber cross-sectional outer shape, so that the flat region on the fiber surface is reduced, and the flat region is prominent in light. It has low reflection and tends to have a gloss similar to that of human hair. Further, the core-sheath composite fiber for artificial hair according to one or more embodiments of the present invention preferably has a surface surface, that is, an outer peripheral shape of the fiber cross section, which is composed of smooth irregularities. The contact area when passed is reduced, and a tactile sensation close to that of human hair and good combability are realized.

One of the features of the present invention is that the core portion has a pair of convex portions along the minor axis direction of the fiber in the fiber cross section, which improves the curl settability. Here, when the fiber cross section, that is, the outer peripheral shape of the sheath portion has a flat bilobed cross-sectional shape, which is a preferable form, a connecting line connecting the opposing concave portions of the fiber cross section and a pair of convex portions of the core portion. By overlapping with the connecting line connecting the above, the curl settability becomes better.

In one or more preferred embodiments of the present invention, the core-sheath composite fiber for artificial hair has a flat bilobed fiber cross section so that the direction of the connecting line connecting the recesses and the direction parallel thereto, that is, the minor axis of the fiber. Due to the fact that the bending moment in the direction tends to be smaller than the bending moment in the major axis direction of the fibers intersecting with the connecting line, preferably orthogonal fibers, it tends to bend in the minor axis direction when bending deformation is applied. Therefore, the cross-sectional shape of the core portion has a pair of convex portions protruding from the center side to the outer peripheral side in opposite directions along the minor axis direction of the fiber, so that the core portion and the sheath portion in the minor axis direction of the fiber are formed. Since the fiber has a substantially large core line segment ratio, which indicates the ratio of the occupied line segment, even if the polyamide resin content of the entire fiber is high, the polyester resin is used in the minor axis direction of the fiber. By supplementing the properties of the polyamide-based resin with low curl settability, fibers with extremely high curl settability can be obtained.

The core-sheath ratio of the core-sheath composite fiber for artificial hair is in the range of 3: 7 to 8: 2, preferably in the range of 4: 6 to 7: 3, in terms of area ratio. When the core-sheath ratio is within the above-mentioned range, the bending moment as a physical property related to the tactile sensation and texture becomes close to that of human hair, so that artificial hair of the same quality as human hair can be easily obtained.

When the ratio of the core part is small, the bending moment tends to be smaller than that of human hair. On the other hand, when the ratio of the core portion is large, the flexural rigidity value tends to be large, and the thickness of the layer in the cross section of the sheath portion becomes extremely thin, so that the core is easily exposed. There is also the possibility that a problem such as peeling of the sheath from the core may occur. It is preferable that the core portion is not exposed on the fiber surface and is completely covered with the sheath portion.

The cross-sectional shape of the fiber and the core portion and the core-sheath ratio described above can be controlled by using a nozzle (hole) having a shape close to the target cross-sectional shape.

From the viewpoint of being suitable for artificial hair, the core-sheath composite fiber for artificial hair preferably has a single fiber fineness of 10 dtex or more and 150 dtex or less, more preferably 30 dtex or more and 120 dtex or less, and further preferably 40 dtex or more and 100 dtex or less. Particularly preferably, it is 50 dtex or more and 90 dtex or less.

The core-sheath composite fibers for artificial hair according to one or more embodiments of the present invention do not necessarily have all the fibers having the same fineness and cross-sectional shape as an aggregate of fibers, for example, a fiber bundle, and have different fineness and cross-sectional shape. Fibers having a shape may be mixed.

(Composition of core-sheath composite fiber)
In one or more embodiments of the present invention, the sheath portion is composed of a polyamide-based resin composition containing a polyamide-based resin, that is, a polyamide-based resin composition containing a polyamide-based resin as a main component, so that the tactile sensation is improved. .. In one or more embodiments of the present invention, the "polyamide-based resin composition containing a polyamide-based resin as a main component" means 67 weight of the polyamide-based resin when the total weight of the polyamide-based resin composition is 100% by weight. It means that it is contained in an amount of% or more, preferably 75% by weight or more, more preferably 85% by weight or more, further preferably 90% by weight or more, and further preferably 95% by weight or more.

The polyamide resin is nylon obtained by polymerizing one or more selected from the group consisting of lactam, a mixture of aminocarboxylic acid, dicarboxylic acid and diamine, a mixture of dicarboxylic acid derivative and diamine, and a salt of dicarboxylic acid and diamine. Means resin.

Specific examples of lactam include, but are not limited to, 2-azetidineone, 2-pyrrolidinone, δ-valerolactam, ε-caprolactam, enantractam, caprilactam, undecalactam, laurolactam and the like. .. Of these, ε-caprolactam, undecalactam, and laurolactam are preferable, and ε-caprolactam is particularly preferable. These lactams may be used alone or in a mixture of two or more.

Specific examples of the aminocarboxylic acid are not particularly limited, but for example, 6-aminocaproic acid, 7-aminoheptanoic acid, 8-aminooctanoic acid, 9-aminononanoic acid, 10-aminodecanoic acid, 11-aminoundecanoic acid, 12 -Aminododecanoic acid and the like can be mentioned. Of these, 6-aminocaproic acid, 11-aminoundecanoic acid, and 12-aminododecanoic acid are preferable, and 6-aminocaproic acid is particularly preferable. These aminocarboxylic acids may be used alone or in a mixture of two or more.

Specific examples of the dicarboxylic acid used in a mixture of dicarboxylic acid and diamine, a mixture of dicarboxylic acid derivative and diamine, or a salt of dicarboxylic acid and diamine are not particularly limited, but for example, oxalic acid, malonic acid, succinic acid, and glutal. Acids, adipic acids, pimelliic acids, suberic acids, azelaic acids, sebacic acids, undecanedioic acids, dodecanedioic acids, brushphosphoric acids, tetradecanedioic acids, pentadecanedioic acids, octadecanedioic acids and other aliphatic dicarboxylic acids, cyclohexanedicarboxylic acids, etc. Examples thereof include aromatic dicarboxylic acids such as alicyclic dicarboxylic acid, phthalic acid, isophthalic acid, terephthalic acid, and naphthalenedicarboxylic acid. Of these, adipic acid, sebacic acid, dodecanedioic acid, terephthalic acid, and isophthalic acid are preferable, and adipic acid, terephthalic acid, and isophthalic acid are particularly preferable. These dicarboxylic acids may be used alone or in a mixture of two or more.

It is used as a mixture of dicarboxylic acid and diamine, a mixture of dicarboxylic acid derivative and diamine, or a salt of dicarboxylic acid and diamine. Specific examples of the diamine are not particularly limited, but for example, 1,4-diaminobutane, 1,5-diaminopentane, 1,6-diaminohexane, 2-methyl-1,5-diaminopentane (MDP), 1 , 7-Diaminoheptane, 1,8-diaminooctane, 1,9-diaminononane, 1,10-diaminodecane, 1,11-diaminoundecane, 1,12-diaminododecane, 1,13-diaminotridecane, 1, 14-diaminotetradecane, 1,15-diaminopentadecane, 1,16-diaminohexadecan, 1,17-diaminoheptadecan, 1,18-diaminooctadecane, 1,19-diaminononadecan, 1,20-diaminoeikosan, etc. Examples thereof include aliphatic diamines, cyclohexanediamines, alicyclic diamines such as bis- (4-aminohexyl) methane, aromatic diamines such as m-xylylene diamine and p-xylylene diamine. Of these, aliphatic diamines are particularly preferable, and hexamethylenediamine is particularly preferably used. These diamines may be used alone or in a mixture of two or more.

The polyamide resin (sometimes referred to as nylon resin) is not particularly limited, but for example, nylon 6, nylon 66, nylon 11, nylon 12, nylon 6/10, nylon 6/12, nylon 6T and / or 6I. It is preferable to use semi-aromatic nylon containing a unit, a copolymer of these nylon resins, and the like. In particular, a copolymer of nylon 6, nylon 66, nylon 6 and nylon 66 is more preferable.

The polyamide-based resin can be produced, for example, by a polyamide-based resin polymerization method in which a polyamide-based resin raw material is heated in the presence or absence of a catalyst. Stirring may or may not occur during the polymerization, but stirring is preferred to obtain a homogeneous product. The polymerization temperature can be arbitrarily set according to the degree of polymerization, reaction yield, and reaction time of the target polymer, but a low temperature is preferable from the viewpoint of the quality of the finally obtained polyamide resin. The reaction rate can also be set arbitrarily. Although there is no limitation on the pressure, it is preferable to reduce the pressure inside the system in order to efficiently extract the volatile components to the outside of the system.

The polyamide resin used in the present invention may be terminally sealed with an end-sealing agent such as a carboxylic acid compound and an amine compound, if necessary. When the terminal is sealed by adding a monocarboxylic acid or monoamine, the concentration of the terminal amino group or the terminal carboxyl group of the obtained nylon resin is lower than that when the terminal blocking agent is not used. On the other hand, when the terminal is blocked with a dicarboxylic acid or diamine, the sum of the concentrations of the terminal amino group and the terminal carboxyl group does not change, but the ratio of the concentrations of the terminal amino group and the terminal carboxyl group changes.

Specific examples of the carboxylic acid compound are not particularly limited, but for example, acetic acid, propionic acid, butyric acid, valeric acid, caproic acid, enanthic acid, capric acid, pelargonic acid, undecanoic acid, lauric acid, tridecanoic acid, myristic acid, Alipid monocarboxylic acids such as myristoleic acid, palmitic acid, stearic acid, oleic acid, linoleic acid, and araquinic acid, alicyclic monocarboxylic acids such as cyclohexanecarboxylic acid and methylcyclohexanecarboxylic acid, benzoic acid, toluic acid, ethyl Aromatic monocarboxylic acids such as benzoic acid and phenylacetic acid, oxalic acid, malonic acid, succinic acid, glutaric acid, adipic acid, pimelli acid, suberic acid, azelaic acid, sebacic acid, undecanedioic acid, dodecanedioic acid, brushphosphoric acid , Tetradecanedioic acid, pentadecanedioic acid, octadecanedioic acid and other aliphatic dicarboxylic acids, cyclohexanedicarboxylic acid and other alicyclic dicarboxylic acids, phthalic acid, isophthalic acid, terephthalic acid, naphthalenedicarboxylic acid and other aromatic dicarboxylic acids. Can be mentioned.

Specific examples of the amine compound are not particularly limited, but for example, butylamine, pentylamine, hexylamine, heptylamine, octylamine, 2-ethylhexylamine, nonylamine, decylamine, undecylamine, dodecylamine, tridecylamine, tetra. Aliper monoamines such as decylamine, pentadecylamine, hexadecylamine, octadecylamine, nonadecilamine, and icosylamine, alicyclic monoamines such as cyclohexylamine and methylcyclohexylamine, aromatic monoamines such as benzylamine and β-phenylethylamine, 1 , 4-Diaminobutane, 1,5-diaminopentane, 1,6-diaminohexane, 1,7-diaminoheptane, 1,8-diaminooctane, 1,9-diaminononane, 1,10-diaminodecane, 1,11 -Diaminoundecane, 1,12-diaminododecane, 1,13-diaminotridecane, 1,14-diaminotetradecane, 1,15-diaminopentadecane, 1,16-diaminohexadecan, 1,17-diaminoheptadecan, 1, 18-Diaminooctadecane, 1,19-diaminononadecan, aliphatic diamines such as 1,20-diaminoeikosan, cyclohexanediamine, alicyclic diamines such as bis- (4-aminohexyl) methane, xylylene diamines, etc. Aromatic amines and the like can be mentioned.

The terminal group concentration of the polyamide resin is not particularly limited, but when it is necessary to improve the dyeability for textile applications or when designing a material suitable for alloying for resin applications, the higher the terminal amino group concentration is. preferable. On the contrary, when it is desired to suppress coloring and gelation under long-term aging conditions, it is preferable that the terminal amino group concentration is low. Furthermore, if you want to suppress lactam regeneration during remelting, yarn breakage during melt spinning due to oligomer formation, mold deposit during continuous injection molding, and die mark generation during continuous extrusion of film, both the terminal carboxyl group concentration and the terminal amino group concentration are both. Lower is preferable. The terminal group concentration may be adjusted depending on the intended use, but both the terminal amino group concentration and the terminal carboxyl group concentration are preferably 1.0 × 10 ^-5 to 15.0 × 10 ^-5 eq / g, more preferably. It is 2.0 × 10 ^-5 to 12.0 × 10 ^-5 eq / g, particularly preferably 3.0 × 10 ^-5 to 11.0 × 10 ^-5 eq / g.

In addition, as a method of adding the terminal sequestering agent, a method of adding the terminal sequestering agent at the same time as a raw material such as caprolactam at the initial stage of polymerization, a method of adding the nylon resin during the polymerization, and a method of adding the nylon resin when passing it through a vertical stirring thin film evaporator in a molten state. Etc. are adopted. The terminal sequestering agent may be added as it is, or may be dissolved in a small amount of solvent and added.

The polyamide resin is preferably a polyamide resin mainly composed of at least one selected from the group consisting of nylon 6 and nylon 66 from the viewpoint of resin physical properties, versatility and cost. In one or more embodiments of the present invention, the "polyamide-based resin mainly composed of at least one selected from the group consisting of nylon 6 and nylon 66" is a polyamide containing 80 mol% or more of nylon 6 and / or nylon 66. It means a based resin.

The polyamide-based resin composition constituting the sheath portion may contain other resins in addition to the polyamide-based resin. Examples of other resins include polyamide-based resins, vinyl chloride-based resins, modaacrylic-based resins, polycarbonate-based resins, polyolefin-based resins, and polyphenylene sulfide-based resins. These may be used alone or in combination of two or more.

In one or more embodiments of the present invention, from the viewpoint of improving curl settability, the core portion is composed of a polyester resin composition containing a polyester resin, that is, a polyester resin composition containing a polyester resin as a main component. It is preferable that the resin is used. In one or more embodiments of the present invention, the "polyester resin composition containing a polyester resin as a main component" means 67 weights of the polyester resin when the total weight of the polyester resin compositions is 100% by weight. It means that it is contained in an amount of% or more, preferably 75% by weight or more, more preferably 85% by weight or more, further preferably 90% by weight or more, and further preferably 95% by weight or more.

The polyester resin is preferably one or more selected from the group consisting of polyalkylene terephthalate and copolymerized polyester mainly composed of polyalkylene terephthalate from the viewpoint of physical properties, versatility, and cost. In one or more embodiments of the present invention, the "copolymerized polyester mainly composed of polyalkylene terephthalate" refers to a copolymerized polyester containing 80 mol% or more of polyalkylene terephthalate.

The polyalkylene terephthalate is not particularly limited, and examples thereof include polyethylene terephthalate, polypropylene terephthalate, polybutylene terephthalate, and polycyclohexanedimethylene terephthalate.

The copolymerized polyester mainly composed of polyalkylene terephthalate is not particularly limited, but for example, polyalkylene terephthalate such as polyethylene terephthalate, polypropylene terephthalate, polybutylene terephthalate, and polycyclohexanedimethylene terephthalate is mainly used, and other copolymerization components are used. Examples thereof include copolymerized polyester contained therein.

Other copolymerization components include, for example, isophthalic acid, orthophthalic acid, naphthalenedicarboxylic acid, paraphenylenedicarboxylic acid, trimellitic acid, pyromellitic acid, succinic acid, glutaric acid, adipic acid, suberic acid, azelaic acid, sebacic acid. , Polyvalent carboxylic acids such as dodecanedioic acid and their derivatives; dicarboxylic acids including sulfonates such as 5-sodium sulfoisophthalic acid, 5-sodium sulfoisophthalate dihydroxyethyl and their derivatives; 1,2-propanediol , 1,3-Propanediol, 1,4-Butanediol, 1,6-Hexanediol, Neopentylglycol, 1,4-Cyclohexanedimethanol, Diethyleneglycol, Polyethylene glycol, Trimethylolpropane, Pentaerythritol, 4-Hydroxybenzo Examples thereof include acid, ε-caprolactone, and ethylene glycol ether of bisphenol A.

From the viewpoint of stability and ease of operation, the copolymerized polyester is preferably produced by reacting the main polyalkylene terephthalate with a small amount of other copolymerizing components. As the polyalkylene terephthalate, a polymer of terephthalic acid and / or a derivative thereof (for example, methyl terephthalate) and alkylene glycol can be used. The copolymerized polyester is a mixture of terephthalic acid and / or a derivative thereof (for example, methyl terephthalate) used for the polymerization of the main polyalkylene terephthalate and alkylene glycol, and a small amount of other copolymerization components such as a monomer or an oligomer. It may be produced by polymerizing the one containing the component.

The copolymerized polyester may have the above-mentioned other copolymerization components polycondensed on the main chain and / or side chain of the main polyalkylene terephthalate, and the copolymerization method is not particularly limited.

Specific examples of the copolymerized polyester mainly composed of polyalkylene terephthalate include, for example, ethylene glycol ether of bisphenol A, 1,4-cyclohexadimethanol, isophthalic acid and dihydroxyethyl 5-sodium sulfoisophthalate mainly composed of polyethylene terephthalate. Examples thereof include polyester obtained by copolymerizing a kind of compound selected from the group consisting of.

The copolymerized polyester mainly composed of polyalkylene terephthalate and polyalkylene terephthalate may be used alone or in combination of two or more. Among them, polyethylene terephthalate; polypropylene terephthalate; polybutylene terephthalate; polyester mainly composed of polyethylene terephthalate and copolymerized with ethylene glycol ether of bisphenol A; polyester mainly composed of polyethylene terephthalate and copolymerized with 1,4-cyclohexanedimethanol; polyester. It is preferable to use polyester mainly composed of terephthalate and copolymerized with isophthalic acid; and polyester mainly composed of polyethylene terephthalate and copolymerized with dihydroxyethyl 5-sodium sulfoisophthalate alone or in combination of two or more.

The intrinsic viscosity (sometimes referred to as IV value) of the polyester resin is not particularly limited, but is preferably 0.3 or more and 1.2 or less, and more preferably 0.4 or more and 1.0 or less. .. When the intrinsic viscosity is 0.3 or more, the mechanical strength of the obtained fiber does not decrease, and there is no risk of drip during the combustion test. Further, when the intrinsic viscosity is 1.2 or less, the molecular weight does not increase too much, the melt viscosity does not become too high, melt spinning becomes easy, and the fineness tends to be uniform.

The polyester-based resin composition constituting the core may contain other resins in addition to the polyester-based resin which is the main component resin. Examples of other resins include polyamide-based resins, vinyl chloride-based resins, modaacrylic-based resins, polycarbonate-based resins, polyolefin-based resins, and polyphenylene sulfide-based resins. These may be used alone or in combination of two or more.

The core-sheath composite fiber for artificial hair is made of a copolymerized polyester mainly composed of polyalkylene terephthalate and polyalkylene terephthalate from the viewpoint of making the tactile sensation and appearance closer to human hair and further improving the curl property and curl retention property. It is preferable to use a polyester resin composition containing at least one polyester resin selected from the above group as a main component, and the sheath portion is mainly composed of at least one selected from the group consisting of nylon 6 and nylon 66. It is more preferable to use a polyamide-based resin composition containing a polyamide-based resin as a main component.

In one or more embodiments of the present invention, a flame retardant may be used in combination from the viewpoint of flame retardancy. Examples of the flame retardant include a bromine-containing flame retardant and a phosphorus-containing flame retardant. Examples of the phosphorus-containing flame retardant include a phosphate ester amide compound and an organic cyclic phosphorus-based compound. The bromine-based flame retardant is not particularly limited, and for example, a brominated epoxy-based flame retardant; pentabromotoluene, hexabromobenzene, decabromodiphenyl, decabromodiphenyl ether, bis (tribromophenoxy) ethane, tetrabromophthalic acid, and the like. Bromine-containing phosphate esters such as ethylenebis (tetrabromophthalimide), ethylenebis (pentabromophenyl), octabromotrimethylphenylindan, tris (tribromoneopentyl) phosphate; brominated polystyrenes; brominated polybenzyl acrylates Brominated phenoxy resin; Brominated polycarbonate oligomers; Tetrabromobisphenol A, Tetrabromobisphenol A-bis (2,3-dibromopropyl ether), Tetrabromobisphenol A-bis (allyl ether), Tetrabromobisphenol A-bis Tetrabromobisphenol A derivatives such as (hydroxyethyl ether); bromine-containing triazine compounds such as tris (tribromophenoxy) triazine; bromine-containing isocyanuric acid compounds such as tris (2,3-dibromopropyl) isocyanurate. Be done. Above all, from the viewpoint of heat resistance and flame retardancy, it is preferable to use a brominated epoxy flame retardant.

As the brominated epoxy flame retardant, a brominated epoxy flame retardant whose molecular end is composed of an epoxy group or tribromophenol can be used as a raw material, but the structure of the brominated epoxy flame retardant after melt-kneading is particularly high. Not limited to this, when the total number of the constituent units represented by the following formula (1) and the constituent units in which at least a part of the following formula (1) is modified is 100 mol%, 80 mol% or more is represented by the following formula (1). It is preferably a constituent unit. The structure of the brominated epoxy flame retardant may change at the molecular end after melt-kneading. For example, the molecular end of the brominated epoxy flame retardant may be substituted with an epoxy group or a hydroxyl group other than tribromophenol, a phosphoric acid group, a phosphonic acid group, or the like, and the molecular end is bonded to the polyester component by an ester group. You may.

Further, a part of the structure other than the molecular terminal of the brominated epoxy flame retardant may be changed. For example, the secondary hydroxyl group of the brominated epoxy flame retardant and the epoxy group may be bonded to form a branched structure, and if the bromine content in the brominated epoxy flame retardant molecule does not change significantly, the above formula ( A part of the bromine of 1) may be desorbed or added.

As the brominated epoxy flame retardant, for example, a polymer type brominated epoxy flame retardant as shown in the following formula (2) is preferably used. In the following formula (2), m is 1 to 1000. Examples of the polymer-type brominated epoxy flame retardant shown in the following formula (2) include brominated epoxy flame retardants manufactured by Sakamoto Yakuhin Kogyo Co., Ltd. (trade name "SR-T2MP"). Commercially available products may be used.

The brominated epoxy flame retardant is not particularly limited, but it is preferable that the core portion and / or the sheath portion contains, for example, 5 parts by weight or more and 40 parts by weight or less with respect to 100 parts by weight of the main component resin. For example, from the viewpoint of heat resistance and flame retardancy, 100 parts by weight of one or more polyester-based resins selected from the group consisting of a polyalkylene terephthalate and a copolymerized polyester mainly composed of polyalkylene terephthalate, and a brominated epoxy. 100 parts by weight of a polyamide resin composed of a polyester resin composition containing 5 parts by weight or more and 40 parts by weight or less of a flame retardant, and having a sheath portion mainly composed of at least one selected from the group consisting of nylon 6 and nylon 66. It is preferably composed of a polyamide resin composition containing 5 parts by weight or more and 40 parts by weight or less of a brominated epoxy flame retardant.

In one or more embodiments of the present invention, a flame retardant aid may be used in combination. The flame retardant aid is not particularly limited, but from the viewpoint of flame retardancy, it is preferable to use an antimony compound, a composite metal containing antimony, or the like. Examples of antimony compounds include antimony trioxide, antimony tetroxide, antimony pentoxide, sodium antimonate, potassium antimonate, calcium antimonate and the like. From the viewpoint of flame retardancy improving effect and influence on tactile sensation, one or more selected from the group consisting of antimony trioxide, antimony pentoxide, and sodium antimonate is more preferable.

The flame retardant aid is not particularly limited, but it is preferable that the core portion and / or the sheath portion contains, for example, 0.1 part by weight or more and 10 parts by weight or less with respect to 100 parts by weight of the main component resin.

In particular, by incorporating a flame-retardant aid in the polyamide-based resin composition constituting the sheath portion, appropriate surface irregularities are formed on the fiber surface, and in addition to flame retardancy, it has a low-gloss appearance close to that of human hair. A core-sheath composite fiber for artificial hair can be obtained.

The core-sheath composite fiber for artificial hair contains various additives such as a heat resistant agent, a stabilizer, a fluorescent agent, an antioxidant, and an antistatic agent, if necessary, within a range that does not impair the effects of the present invention. You may.

(Manufacturing method of core-sheath composite fiber)
In one or more embodiments of the present invention, in the core-sheath composite fiber for artificial hair, the resin compositions constituting the core and the sheath are individually melt-kneaded using various general kneaders. It can be produced by melt-spinning using a core-sheath type composite nozzle.

For example, a polyester resin composition obtained by dry-blending each component such as the polyester resin and the brominated epoxy flame retardant described above is melt-kneaded using various general kneaders to form a core component. On the other hand, a polyamide-based resin composition in which each component such as the above-mentioned polyamide-based resin and brominated epoxy flame retardant is dry-blended is melt-kneaded using various general kneaders to form a sheath portion. It can be produced by using it as a sheath component and performing melt spinning using a composite spinning nozzle.

Examples of the kneading machine include a single-screw extruder, a twin-screw extruder, a roll, a Banbury mixer, and a kneader. Of these, a twin-screw extruder is preferable from the viewpoint of adjusting the kneading degree and easiness of operation.

In the melt spinning method, for example, in the case of a polyester resin composition, the temperature of the extruder, gear pump, nozzle, etc. is set to 250 ° C. or higher and 300 ° C. or lower, and in the case of a polyamide resin composition, the extruder, gear pump, nozzle, etc. The temperature of each resin is set to 260 ° C. or higher and 320 ° C. or lower, melt-spun, and the spun yarn is passed through a heating cylinder, and then cooled to the glass transition point or lower of each resin, and 50 m / min or more and 5000 m / min or less. Spinned yarn (undrawn yarn) can be obtained by picking up at a high speed.

Specifically, during melt spinning, the polyester resin composition constituting the core portion is supplied by the core extruder extruder of the melt spinning machine, and the polyamide resin composition constituting the sheath portion is the sheath of the melt spinning machine. A spun yarn (undrawn yarn) is obtained by supplying the molten polymer with a core-sheath type composite spinning nozzle (hole) having a predetermined shape and supplying the molten polymer.

It is preferable that the spun yarn (undrawn yarn) is heat-drawn. The stretching may be carried out by either a two-step method in which the spun yarn is wound once and then stretched, or a direct spun drawing method in which the spun yarn is continuously stretched without being wound. The thermal stretching is performed by a one-step stretching method or a two-stage or more multi-step stretching method. As the heating means in the heat stretching, a heating roller, a heat plate, a steam jet device, a hot water tank and the like can be used, and these can be used in combination as appropriate.

In one or more embodiments of the present invention, an oil agent such as a fiber treatment agent or a softening agent may be applied to the core-sheath composite fiber for artificial hair to bring the feel and texture closer to human hair.

Examples of the fiber treatment agent include a silicone-based fiber treatment agent and a non-silicone-based fiber treatment agent for improving the tactile sensation and combability.

Further, in one or more embodiments of the present invention, the core-sheath composite fiber for artificial hair may be processed by gear crimping. As a result, the fibers are gently bent, a natural appearance is obtained, and the adhesion between the fibers is lowered, so that the combability is also improved.

In the processing by the gear crimp, generally, the fiber is passed between two meshed gears in a state where the fiber is heated to the softening temperature or higher, and the shape of the gear is transferred to develop the fiber bending. Further, if necessary, curls having different shapes can be developed by heat-treating the core-sheath composite fibers for artificial hair at different temperatures in the fiber manufacturing stage.

(Head decoration product)
In one or more embodiments of the present invention, the core-sheath composite fiber for artificial hair can be suitably used for a headdress product. The headdress product is not particularly limited, but preferably one selected from the group consisting of hair wigs, wigs, weaving, hair extensions, blade hairs, hair accessories and doll hairs, and a sufficiently excellent curl set according to the present invention is mentioned. Hair wigs and weaving are more preferable from the viewpoint of exerting sex more effectively.

The headdress product may be composed of only the core-sheath composite fiber for artificial hair of the present invention, or may be composed of a combination of other core-sheath composite fibers for artificial hair and natural fibers such as human hair and animal hair. good.

Hereinafter, the present invention will be described in more detail based on examples. The present invention is not limited to these examples.

The measurement method and evaluation method used in the examples and comparative examples are as follows.

(Single fiber fineness)
It was measured using a motorcycle blow type fineness measuring device "DENIER COMPUTER type DC-11" (manufactured by Search), and the average value of the measured values of 30 samples was calculated to obtain a single fiber fineness.

(Curl set property)
At room temperature (23 ° C), the minoge filament is wrapped around a φ32 mm pipe, curled at 120 ° C for 60 minutes, aged at room temperature (23 ° C) for 60 minutes, and then one end of the curled filament is fixed for fishing. The filament length after lowering and setting was measured. Using this length as an index of curl setability, it was judged that curl set was possible when the length was 17 cm or less.

(Exposure of core)
At room temperature (23 ° C), the fibers are bundled, fixed with a shrinkable tube so that the fiber bundle (total fineness 550 dtex) does not shift, and then cut with a cutter, and the presence or absence of exposure of the core at that time is visually checked. Evaluation or evaluation was performed by observing the cut fiber cross section with a laser microscope (“VK-9500” manufactured by KEYENCE CORPORATION).

(Shape of fiber cross section)
At room temperature (23 ° C.), the fibers were bundled, fixed with a shrinkable tube so that the fiber bundle (total fineness 550 dtex) did not shift, and then sliced with a cutter to prepare a fiber bundle for cross-section observation. This fiber bundle was photographed with a laser microscope (manufactured by KEYENCE CORPORATION, "VK-9500") at a magnification of 500 times to obtain a cross-sectional photograph of the fiber. The core-sheath ratio, L / S and Lc / Sc were determined based on the fiber cross-sectional photograph.

(Tactile)
A sensory evaluation was performed by a professional beautician, and the evaluation was made according to the following four criteria.
A: Very good tactile sensation equivalent to human hair B: Slightly inferior to human hair but good tactile sensation C: Inferior to human hair Bad tactile sensation D: Greatly inferior to human hair

(Combability)
With the curl completely stretched, the fibers were cut to a length of 63.5 cm, and 5.0 g of the obtained fibers having a fiber length of 63.5 cm were bundled. Then, the center of the fiber bundle was tied with a string, folded in half, and the string portion was fixed to prepare a fiber bundle for hair ironing. Next, with a hair iron heated to 180 ° C. (“IZUNAMI ITC450 Flat Iron” manufactured by IZUNAMI.INC, USA), the operation of heating while crimping from the root to the tip of the hair that fixes the fiber bundle is repeated 5 times. , A fiber bundle for evaluation of combability was prepared. After that, with a comb for combing hair (Made in Germany, "MATADOR PROFESSIONAL 386.81 / 2F"), pass the comb 100 times from the root to the tip of the hair, which fixes the fiber bundle for comb passability evaluation, and deform or split. From the number of fibers formed, the combability was evaluated according to the following criteria.
A: The number of fibers deformed or split through the comb 100 times is less than 10, and the comb passes through without resistance until the end. Level B: The number of fibers deformed or split through the comb 100 times is 10 or more and less than 30 fibers. Level C: The number of fibers deformed or split by passing the comb 100 times is 30 or more and less than 100, and the resistance becomes stronger in the middle and the comb does not pass once or more 20 times. Level D that occurs with a probability of less than 100 times: The number of fibers that have been deformed or split by passing through the comb 100 times is 100 or more, and the resistance becomes stronger in the middle, and the level at which the comb does not pass with a probability of 20 times or more.

(Example 1)
100 parts by weight of polyethylene terephthalate pellets (manufactured by East West Chemical Private Limited, East PET product name "A-12", hereinafter also referred to as "PET"), brominated epoxy flame retardant (manufactured by Sakamoto Pharmaceutical Co., Ltd., product name "SR-T2MP") 20 parts by weight and 2 parts by weight of sodium antimonate (manufactured by Nihon Seiko Co., Ltd., trade name "SA-A") are added, and after dry blending, they are supplied to a twin-screw extruder and melted at a barrel set temperature of 280 ° C. Kneading was carried out and pelletized to obtain a polyester resin composition.

Subsequently, 100 parts by weight of nylon 6 (manufactured by Unitika, trade name "A1030BRL", hereinafter also referred to as "PA6") and 20 parts by weight of brominated epoxy flame retardant (manufactured by Sakamoto Yakuhin Kogyo, trade name "SR-T2MP") , And sodium antimonate (manufactured by Nihon Seiko Co., Ltd., trade name "SA-A") were added by 2 parts by weight, and after dry blending, they were supplied to a twin-screw extruder, melt-kneaded at a barrel set temperature of 260 ° C., and pelleted. To obtain a polyamide-based resin composition.

Next, the pellet-shaped polyester resin composition and the polyamide resin composition are supplied to the extruder, respectively, and extruded from the core-sheath type composite spinning nozzle (hole) having the flatness ratio and shape shown in Table 1 below, and are 40 to 200 m. Winding at a rate of / min, the polyester-based resin composition is used as the core, the polyamide-based resin composition is used as the sheath, and the core-sheath ratio is the area ratio of core: sheath of 5: 5, as shown in Table 1 below. An undrawn yarn of a core-sheath composite fiber having the described cross-sectional shape was obtained. The nozzle flatness ratio is the length of the long axis, which is the maximum length of the line segment connecting arbitrary two points on the outer circumference of the line segment so as to be parallel to the line symmetry axis and the line symmetry axis in the nozzle cross section. , The ratio of the length of the minor axis, which is the maximum length of the line segment connecting any two points on the outer circumference of the fiber cross section so as to be perpendicular to the major axis.

The obtained undrawn yarn was drawn using a heat roll at 85 ° C. at a speed of 45 m / min to obtain a triple drawn yarn, and further, 45 m / min using a heat roll continuously heated to 200 ° C. Take up and heat-treat at the speed of After adhering, it was dried to obtain a core-sheath composite fiber having a single fiber fineness shown in Table 1 below.

(Example 2)
The resin used for the sheath was nylon 66 (manufactured by Toray Industries, Inc., trade name "Amiran CM3001"), the barrel set temperature at the time of pelletization was 280 ° C, the core-sheath ratio was the area ratio, and the core: sheath was 7: 3. A core-sheath composite fiber was obtained in the same manner as in Example 1 except for the above.

(Example 3)
A core-sheath composite fiber was obtained in the same manner as in Example 1 except that the core-sheath ratio was an area ratio and the core: sheath was 8: 2.

(Example 4)
A core-sheath composite fiber was obtained in the same manner as in Example 1 except that the nozzle flatness ratio was 1.4.

(Comparative Example 1)
A core-sheath composite fiber was obtained in the same manner as in Example 1 except that the nozzle shape was the shape shown in Table 1 below.

(Comparative Example 2)
A core-sheath composite fiber was obtained in the same manner as in Example 2 except that the nozzle shape was the shape shown in Table 1 below.

(Comparative Example 3)
A core-sheath composite fiber was obtained in the same manner as in Example 1 except that the nozzle shape was the shape shown in Table 1 below.

(Comparative Example 4)
A core-sheath composite fiber was obtained in the same manner as in Example 1 except that the core-sheath ratio was an area ratio, the core: sheath was 2: 8, and the nozzle shape was the shape shown in Table 1 below.

(Comparative Example 5)
A core-sheath composite fiber was obtained in the same manner as in Example 1 except that the core-sheath ratio was an area ratio and the core: sheath was 9: 1.

(Comparative Example 6)
A core-sheath composite fiber was obtained in the same manner as in Example 4 except that the nozzle shape was the shape shown in Table 1 below.

The presence or absence of exposed fiber cores and the cross-sectional shape of the fibers of Examples and Comparative Examples were evaluated and observed as described above. In addition, the curl setability, tactile sensation, and combability of the fibers of Examples and Comparative Examples were evaluated as described above. These results are shown in Table 1.

FIG. 2 is a laser micrograph of a fiber cross section of the fiber of Example 1. As can be seen from FIG. 2, in the core-sheath composite fiber for artificial hair, the fiber has a flat bilobed cross-sectional shape, and the core portion protrudes from the center side to the outer peripheral side along the minor axis direction of the fiber cross section. It has a modified flat bilobed cross-sectional shape with a pair of convex parts. FIG. 3 is a laser micrograph of a fiber cross section of the fiber of Comparative Example 1. As shown in FIG. 3, in the core-sheath composite fiber for artificial hair, both the fiber and the core portion have a flat bilobed cross-sectional shape. FIG. 4 is a laser micrograph of a fiber cross section of the fiber of Comparative Example 3. As shown in FIG. 4, in the core-sheath composite fiber for artificial hair, both the fiber and the core portion have a substantially circular cross-sectional shape.

As can be seen from Table 1, the fibers of Examples 1 to 4 had good curl settability, had no exposed core, had a tactile sensation similar to human hair, and had good combability.

On the other hand, the fibers of Comparative Example 1, Comparative Example 2 and Comparative Example 6 having no pair of convex portions in the cross-sectional shape of the core portion had poor curl settability. The fiber of Comparative Example 3 having a circular fiber cross section had an unnatural appearance because the fiber surface had no irregularities, and good fibers could not be obtained in terms of both tactile sensation and combing. The fiber of Comparative Example 4 in which the core-sheath ratio was 2: 8 in area ratio resulted in inferior curl setability because the core portion was too small. In the fiber of Comparative Example 5 in which the core-sheath ratio was 9: 1, the thickness of the sheath was too thin and the core was exposed, and both the tactile sensation and combing were very poor.

The present invention is not particularly limited, but may include, for example, the following embodiments.
[1] A core-sheath composite fiber for artificial hair including a core and a sheath.
The core-sheath composite fiber for artificial hair has a flat bilobed or elliptical cross-sectional shape, and the core-sheath ratio in the fiber cross section is an area ratio of core: sheath of 3: 7 to 8: 2.
The sheath portion is composed of a polyamide-based resin composition containing a polyamide-based resin.
The core portion is an artificial hair having a deformed flat bilobed shape or a deformed elliptical cross-sectional shape having a pair of convex portions protruding from the central side toward the outer peripheral side along the minor axis direction of the fiber cross section. Core sheath composite fiber.
[2] The core-sheath composite fiber for artificial hair according to [1], wherein the core-sheath composite fiber for artificial hair has a flat bilobed cross-sectional shape, and the core portion has a deformed flat bilobed cross-sectional shape.
[3] The core portion is composed of a polyester-based resin composition containing one or more polyester-based resins selected from the group consisting of polyalkylene terephthalate and copolymerized polyester mainly composed of polyalkylene terephthalate. [1] ] Or [2]. The core-sheath composite fiber for artificial hair.
[4] The sheath portion of [1] to [3], wherein the sheath portion is composed of a polyamide-based resin composition containing a polyamide-based resin mainly composed of at least one selected from the group consisting of nylon 6 and nylon 66. The core-sheath composite fiber for artificial hair according to any one.
[5] A headdress product comprising the core-sheath composite fiber for artificial hair according to any one of [1] to [4].
[6] The headdress product according to [5], which is a kind selected from the group consisting of hair wigs, wigs, weaving, hair extensions, blade hairs, hair accessories and doll hairs.
[7] The method for producing a core-sheath composite fiber for artificial hair according to any one of [1] to [4], wherein the core resin composition and the sheath resin assembly composition are used with a core-sheath type composite nozzle. A method for producing a core-sheath composite fiber for artificial hair, which comprises a step of melt-spinning.

1 Core-sheath composite fiber for artificial hair (cross section)
10 Sheath 20 Core 30 Convex

Claims

A core-sheath composite fiber for artificial hair that includes a core and a sheath.
The core-sheath composite fiber for artificial hair has a flat bilobed or elliptical cross-sectional shape, and the core-sheath ratio in the fiber cross section is an area ratio of core: sheath of 3: 7 to 8: 2.
The sheath portion is composed of a polyamide-based resin composition containing a polyamide-based resin.
The core portion is an artificial hair having a deformed flat bilobed shape or a deformed elliptical cross-sectional shape having a pair of convex portions protruding from the central side toward the outer peripheral side along the minor axis direction of the fiber cross section. Core sheath composite fiber.
The core-sheath composite fiber for artificial hair according to claim 1, wherein the core-sheath composite fiber for artificial hair has a flat bilobed cross-sectional shape, and the core portion has a deformed flat bilobed cross-sectional shape.
2. The core-sheath composite fiber for artificial hair described.
The artificial according to any one of claims 1 to 3, wherein the sheath portion is composed of a polyamide-based resin composition containing a polyamide-based resin mainly composed of at least one selected from the group consisting of nylon 6 and nylon 66. Core-sheath composite fiber for hair.
A headdress product comprising the core-sheath composite fiber for artificial hair according to any one of claims 1 to 4.
The headdress product according to claim 5, which is a type selected from the group consisting of hair wigs, wigs, weaving, hair extensions, blade hairs, hair accessories and doll hairs.
The method for producing a core-sheath composite fiber for artificial hair according to any one of claims 1 to 4.
A method for producing a core-sheath composite fiber for artificial hair, which comprises a step of melt-spinning the core resin composition and the sheath resin assembly composition using a core-sheath type composite nozzle.