WO2023127456A1

WO2023127456A1 - Fibers for hair, method for producing same, fiber treatment agent and hair accessory

Info

Publication number: WO2023127456A1
Application number: PCT/JP2022/045352
Authority: WO
Inventors: 宏治浅沼; 栞里津田
Original assignee: デンカ株式会社
Priority date: 2021-12-28
Filing date: 2022-12-08
Publication date: 2023-07-06

Abstract

The present invention provides fibers for hair, the fibers comprising: base material fibers; and a cationic surfactant and a nonionic surfactant, which are present on at least a part of the surfaces of the base material fibers. With respect to the fibers for hair, the cationic surfactant has a carbon chain having 18 to 22 carbon atoms; the nonionic surfactant has a carbon chain having 10 to 20 carbon atoms; the nonionic surfactant has an HLB value of 14.0 to 19.0; the content of the cationic surfactant is 3% by mass to 20% by mass based on the total amount of the nonionic surfactant; and the total amount of the cationic surfactant and the nonionic surfactant is 0.002% by mass to 4% by mass based on the total amount of the fibers for hair.

Description

Hair fiber and its manufacturing method, fiber treatment agent, and hair accessory

The present invention relates to hair fibers and methods for producing the same, fiber treatment agents, hair accessories, and the like.

Hair fibers (fibers used for hair) can be used in hair accessories. Patent Literature 1 listed below discloses a technique for treating substrate fibers using a fiber treatment agent.

JP-A-2002-285470

For hair fibers, from the viewpoint of preventing the user from feeling discomfort, it is required that the fiber bundles have excellent combability (ease of combing). In addition, since the softness of the fiber bundle may be deteriorated when the fiber bundle is rinsed with water, the hair fiber is also required to have excellent softness after rinsing with water.

An object of one aspect of the present invention is to provide hair fibers that are excellent in combability and softness after rinsing with water. Another object of the present invention is to provide a hair accessory comprising such hair fibers. Another object of the present invention is to provide a fiber treatment agent for obtaining such hair fibers. Another object of the present invention is to provide a method for producing such hair fibers.

In some aspects, the present disclosure relates to the following [1] to [9] and the like.
[1] It has a base fiber and a cationic surfactant and a nonionic surfactant present on at least a part of the surface of the base fiber, and the cationic surfactant has 18 to 22 carbon atoms. , the nonionic surfactant has a carbon chain of 10 to 20 carbon atoms, the HLB value of the nonionic surfactant is 14.0 to 19.0, and the cationic interface The content of the active agent is 3 to 20% by mass based on the total amount of the nonionic surfactant, and the total amount of the cationic surfactant and the nonionic surfactant accounts for the total amount of the hair fiber. Hair fibers, which are 0.002 to 4% by weight as a basis.
[2] The base fiber is at least one selected from the group consisting of vinyl chloride homopolymers, vinyl chloride-acrylonitrile copolymers, polyethylene terephthalate, polyamide resins, polypropylene, and acrylonitrile-styrene copolymers. The fiber for hair according to [1], comprising:
[3] The hair fiber according to [1] or [2], wherein the cationic surfactant contains a quaternary ammonium salt having a cation having a structure represented by the following general formula (1).

[In Formula (1), R ¹¹ represents a group containing a carbon chain having 18 to 22 carbon atoms, and R ¹² , R ¹³ and R ¹⁴ each independently represents a monovalent group. ]
[4] The hair fiber according to [3], wherein the cationic surfactant contains a quaternary ammonium salt in which ^R12 and ^R13 in the general formula (1) are methyl groups.
[5] The nonionic surfactant has a structure represented by the following general formula (2a), a structure represented by the following general formula (2b), a structure represented by the following general formula (2c), and the following The hair fiber according to any one of [1] to [4], containing a compound having at least one structure selected from the group consisting of structures represented by general formula (2d).

[In the formula, R ^21a , R ^21b , R ^21c and R ^21d each independently represent a hydrophobic moiety containing a carbon chain having 10 to 20 carbon atoms, and R ^22a , R ^22b , R ^22c , R ^23c and R ^22d each independently represent a hydrophilic moiety, and R ^23d represents a hydrophobic or hydrophilic moiety. ]
[6] The hair fiber according to any one of [1] to [5], wherein the nonionic surfactant contains a polyoxyalkylene alkyl ether.
[7] A hair accessory comprising the hair fiber according to any one of [1] to [6].
[8] Contains a cationic surfactant, a nonionic surfactant, and water, wherein the cationic surfactant has a carbon chain with 18 to 22 carbon atoms, and the nonionic surfactant is It has a carbon chain of 10 to 20 carbon atoms, the HLB value of the nonionic surfactant is 14.0 to 19.0, and the content of the cationic surfactant is the total amount of the nonionic surfactant. and the total amount of the cationic surfactant and the nonionic surfactant is 0.1 to 40% by mass based on the total amount of the fiber treatment agent. agent.
[9] A method for producing fibers for hair, wherein the fiber treatment agent according to [8] is brought into contact with the surface of base fibers.

According to one aspect of the present invention, it is possible to provide hair fibers that are excellent in combability and softness after rinsing with water. According to another aspect of the present invention, a hair accessory comprising such hair fibers can be provided. According to another aspect of the present invention, a fiber treatment agent for obtaining such hair fibers can be provided. According to another aspect of the present invention, a method for producing such hair fibers can be provided.

Hereinafter, embodiments of the present invention will be described in detail.

"A or more" in the numerical range means A and the range exceeding A. "A or less" in a numerical range means A and a range less than A. In the numerical ranges described stepwise in this specification, the upper limit or lower limit of the numerical range in one step can be arbitrarily combined with the upper limit or lower limit of the numerical range in another step. In the numerical ranges described herein, the upper and lower limits of the numerical ranges may be replaced with the values shown in Experimental Examples. "A or B" may include either A or B, or may include both. The materials exemplified in this specification can be used singly or in combination of two or more unless otherwise specified. The content of each component in the composition means the total amount of the plurality of substances present in the composition unless otherwise specified when there are multiple substances corresponding to each component in the composition. The term "process" is included in the term not only as an independent process, but also as long as the intended action of the process is achieved even if it is not clearly distinguishable from other processes. "(Meth)acrylic acid" means at least one of acrylic acid and methacrylic acid corresponding thereto. "Polyoxyalkylene group" and "oxyalkylene group" are collectively referred to as "(poly)oxyalkylene group". The same applies to other expressions including "(poly)".

The fiber for hair according to the present embodiment has a base fiber, and a cationic surfactant and a nonionic surfactant present on at least a part of the surface of the base fiber, and the cationic surfactant has a carbon chain with 18 to 22 carbon atoms, the nonionic surfactant has a carbon chain with 10 to 20 carbon atoms, the HLB value of the nonionic surfactant is 14.0 to 19.0, The content of the cationic surfactant is 3 to 20% by mass based on the total amount of the nonionic surfactant, and the total amount of the cationic surfactant and the nonionic surfactant accounts for the total amount of the hair fiber. As a standard, it is 0.002 to 4% by mass.

The fiber treatment agent according to the present embodiment contains a cationic surfactant, a nonionic surfactant, and water, the cationic surfactant has a carbon chain with 18 to 22 carbon atoms, and the nonionic The surfactant has a carbon chain with 10 to 20 carbon atoms, the HLB value of the nonionic surfactant is 14.0 to 19.0, and the content of the cationic surfactant is a nonionic surfactant. The total amount of the cationic surfactant and the nonionic surfactant is 0.1 to 40% by mass based on the total amount of the fiber treatment agent. Hereinafter, a cationic surfactant having a carbon chain of 18 to 22 carbon atoms is sometimes referred to as "cationic surfactant A", and has a carbon chain of 10 to 20 carbon atoms and an HLB value of 14.0 to 19.0 nonionic surfactant is called "nonionic surfactant B".

The hair fibers according to this embodiment are excellent in combability and softness after rinsing with water. According to the fiber treatment agent according to the present embodiment, it is possible to obtain the hair fibers according to the present embodiment, and it is possible to obtain hair fibers having excellent combability and softness after rinsing with water. With respect to combability, the hair fibers and fiber treatment agent according to the present embodiment can reduce the combing resistance to, for example, 340 gf or less (preferably 290 gf or less or 240 gf or less) in evaluations in Examples described later.

One aspect of the hair fiber according to the present embodiment is excellent in softness before rinsing with water. Another aspect of the fiber for hair according to the present embodiment is excellent in stickiness resistance (can reduce stickiness). According to one aspect of the fiber treatment agent according to the present embodiment, it is possible to obtain hair fibers having excellent softness before rinsing with water, and hair fibers having excellent stickiness resistance. Although the factors are not limited, by using the nonionic surfactant B in addition to the cationic surfactant A, the cationic surfactant A aggregates and is present on the surface of the base fiber, resulting in stickiness. is presumed to be suppressed. Another aspect of the fiber treatment agent according to the present embodiment is that it is excellent in dispersibility (dispersion stability), and components that were solid before addition to water (mainly cationic system surfactant) is dispersed in a colloidal state as a whole (the fiber treatment agent is in the state of one phase).

The hair fiber according to the present embodiment can be used as hair (for example, artificial hair), and can also be used for obtaining hair (for example, artificial hair). The fibers for hair according to the present embodiment may be fibers after drawing treatment, or may be undrawn fibers. The single fineness of the hair fiber according to the present embodiment may be 20 to 100 decitex after stretching.

Materials for the base fiber in the hair fiber according to the present embodiment include vinyl chloride resin, polyester resin, polyamide resin, polyolefin resin, ethylene/vinyl acetate copolymer (EVA), acrylonitrile/butadiene rubber ( NBR), thermoplastic polyurethane (TPU), polyester thermoplastic elastomer (TPEE), methyl methacrylate-butadiene-styrene resin (MBS), acrylonitrile-butadiene-styrene resin (ABS), acrylonitrile-styrene copolymer (AS), Examples include polymethyl methacrylate (PMMA), human hair materials (eg, keratin), and the like. The base fiber may contain at least one of these materials as a main component (main resin raw material). That is, the content of at least one of these materials may be 50% by mass or more and may exceed 50% by mass based on the total amount of base fibers.

A vinyl chloride resin is a polymer having structural units derived from vinyl chloride, and is a polymer having vinyl chloride as a monomer unit. The vinyl chloride resin can be obtained by bulk polymerization, solution polymerization, suspension polymerization, emulsion polymerization, or the like, and may be obtained by suspension polymerization from the viewpoint of excellent initial colorability of fibers. The base fiber may contain a mixture of a vinyl chloride-based resin and a component capable of forming a polymer alloy with the vinyl chloride-based resin (eg, acrylonitrile-styrene copolymer).

Vinyl chloride resins include homopolymers of vinyl chloride (homopolymers, polyvinyl chloride), copolymers of vinyl chloride and other monomers, and mixtures of these may be used. Copolymers of vinyl chloride and other monomers include copolymers of vinyl chloride and vinyl esters (vinyl chloride-vinyl acetate copolymer, vinyl chloride-vinyl propionate copolymer, etc.); Copolymers of vinyl and (meth)acrylic acid compounds ((meth)acrylic acid, (meth)acrylic ester, etc.) (vinyl chloride-butyl acrylate copolymer, vinyl chloride-2-ethylhexyl acrylate copolymer etc.); copolymers of vinyl chloride and olefins (vinyl chloride-ethylene copolymers, vinyl chloride-propylene copolymers, etc.); vinyl chloride-acrylonitrile copolymers and the like. The vinyl chloride-based resin does not have to have a structural unit derived from a (meth)acrylic acid compound. In the copolymer, the content of the monomer other than vinyl chloride can be determined according to required qualities such as moldability and thread properties. From the standpoint of easily obtaining excellent combability, softness (before and after rinsing with water), and anti-stickiness, vinyl chloride-based resins are vinyl chloride homopolymers and vinyl chloride-acrylonitrile copolymers. may contain at least one selected from the group consisting of

Examples of polyester resins include polyethylene terephthalate (PET), polybutylene terephthalate, polyethylene-2,6-naphthalate, polymethylene terephthalate, and glycol-modified polyethylene terephthalate (PETG).

Polyamide resins include nylon 6, nylon 66, nylon 11, nylon 12, nylon 6/10, nylon 6/12, and the like.

Polyolefin resins include polyethylene (PE) and polypropylene (PP).

The base fibers are vinyl chloride resins, polyester resins, polyamide resins, polyolefin resins, and acrylonitrile from the viewpoint of easily obtaining excellent combability, softness (before and after rinsing with water), and anti-stickiness. - May contain at least one selected from the group consisting of styrene copolymers and human hair materials, vinyl chloride resins, polyester resins, polyamide resins, polyolefin resins, and acrylonitrile-styrene copolymers It may contain at least one selected from the group consisting of vinyl chloride homopolymer, vinyl chloride-acrylonitrile copolymer, polyethylene terephthalate, polyamide resin, polypropylene, and acrylonitrile-styrene copolymer. At least one kind may be included.

The base fiber may contain a material (hereinafter referred to as "artificial hair material") different from human hair material (for example, keratin). By the way, for hair accessories having base fibers containing artificial hair materials, the user does not like the handleability (braidability when braiding, etc.) or the feel (softness, combability, etc.) like human hair. ). However, even if base fibers containing artificial hair materials are treated with ingredients contained in hair care products (hair conditioners, hair treatments, etc.) used to improve human hair, the same handleability or tactile sensation as human hair can be obtained. may not improve. Therefore, in order to improve base fibers containing artificial hair materials, a method suitable for artificial hair materials is required. In contrast, with the hair fiber according to the present embodiment, even when an artificial hair material is used, it is possible to obtain excellent handleability (e.g., braidability at the time of braiding) while obtaining excellent tactile sensation. .

The content of the artificial hair material or human hair material in the base fiber is 50% by mass or more, 50% by mass or more, 60% by mass or more, 70% by mass or more, 80% by mass or more based on the total mass of the base fiber. , 90% by mass or more, 95% by mass or more, 98% by mass or more, or 99% by mass or more. The base fiber may be composed of only an artificial hair material or human hair material (substantially 100% by mass of the base fiber is the artificial hair material or human hair material).

The content of vinyl chloride-based resin, polyester-based resin, polyamide-based resin, polyolefin-based resin, or acrylonitrile-styrene copolymer in the base fiber is 50% by mass or more, based on the total mass of the base fiber. It may be more than 60% by mass, 70% by mass or more, 80% by mass or more, 90% by mass or more, 95% by mass or more, 98% by mass or more, or 99% by mass or more. The base fiber consists of only vinyl chloride resin, polyester resin, polyamide resin, polyolefin resin, or acrylonitrile-styrene copolymer (substantially 100% by mass of the base fiber is vinyl chloride resin, polyester-based resin, polyamide-based resin, polyolefin-based resin, or acrylonitrile-styrene copolymer). The content of keratin in the substrate fiber is 50% by mass or more, 50% by mass or more, 60% by mass or more, 70% by mass or more, 80% by mass or more, or 90% by mass, based on the total mass of the substrate fiber. or more.

The average fineness of the base fiber is 300 decitex or less, 200 decitex or less, or 100 decitex or less when undrawn, from the viewpoint that the draw ratio can be reduced in order to obtain fine fineness hair fibers. It's okay.

The hair fiber according to this embodiment has a cationic surfactant A and a nonionic surfactant B present on at least part of the surface of the base fiber. The cationic surfactant A and the nonionic surfactant B may exist at the same location or at different locations on the surface of the base fiber. The fiber treatment agent according to this embodiment contains a cationic surfactant A and a nonionic surfactant B.

The cationic surfactant A has a carbon chain with 18 to 22 carbon atoms (hereinafter referred to as "carbon chain A"), and the nonionic surfactant B has a carbon chain with 10 to 20 carbon atoms (hereinafter referred to as "carbon chain B”). A "carbon chain" is a molecular chain formed by continuously bonding carbon atoms. It is a molecular chain formed by A "carbon chain" may be linear, branched or cyclic. A “carbon chain” may or may not have unsaturated bonds.

In the hair fiber and fiber treatment agent according to this embodiment, at least one cationic surfactant A having a carbon chain A and at least one nonionic surfactant B having a carbon chain B are present. In the hair fiber and fiber treatment agent according to the present embodiment, when a cationic surfactant A having a carbon chain A and a cationic surfactant not having a carbon chain A are present, it has a carbon chain A. The proportion of cationic surfactant A is 50 based on the total amount of cationic surfactant (the total amount of cationic surfactant A and cationic surfactant not applicable to cationic surfactant A). % or more, and may exceed 50% by mass. In the hair fiber and fiber treatment agent according to the present embodiment, when there is a nonionic surfactant B having a carbon chain B and a nonionic surfactant not having a carbon chain B, it has a carbon chain B The ratio of nonionic surfactant B is 50 based on the total amount of nonionic surfactants (nonionic surfactant B and the total amount of nonionic surfactants that do not fall under nonionic surfactant B). % or more, and may exceed 50% by mass.

When the number of carbon atoms in the carbon chain A is 18 or more, excellent softness (after rinsing with water) can be obtained. Although the factors are not limited, when the number of carbon atoms in the carbon chain A is 18 or more, the cationic surfactant A is less likely to run off when rinsing with water, so excellent softness (after rinsing with water) can be obtained. It is speculated that When the number of carbon atoms in the carbon chain A is 22 or less, excellent combability can be obtained, and excellent anti-stickiness and excellent dispersibility of the fiber treatment agent can be easily obtained. When the number of carbon atoms in the carbon chain B is 10 or more, excellent combability can be obtained, and excellent anti-stickiness and excellent dispersibility of the fiber treatment agent can be easily obtained. When the number of carbon atoms in the carbon chain B is 20 or less, excellent combability can be obtained, and excellent anti-stickiness and excellent dispersibility of the fiber treatment agent can be easily obtained.

The number of carbon atoms in the carbon chain A in the cationic surfactant A may be 19 or more, 20 or more, or 21 or more from the viewpoint of easily obtaining excellent softness (before and after water rinsing). The number of carbon atoms in the carbon chain A may be 21 or less, 20 or less, or 19 or less from the viewpoint of suitably adjusting combability. From these viewpoints, the number of carbon atoms in the carbon chain A may be 18-20 or 20-22.

Cationic surfactant A is a surfactant having a cationic hydrophilic group, and a hydrophilic group that dissociates into ions in water to become cations. Examples of the cationic surfactant A include quaternary ammonium salts, amine salts, pyridium salts, imidazolinium salts and the like. Salts include halide salts and the like, and include chloride salts, bromide salts, iodide salts and the like.

Quaternary ammonium salts include aliphatic quaternary ammonium salts, aromatic quaternary ammonium salts (excluding heterocyclic quaternary ammonium salts), heterocyclic quaternary ammonium salts, and the like. Amine salts include aliphatic amine salts and the like, and include monoalkylamine salts, dialkylamine salts, trialkylamine salts and the like.

Cationic surfactant A may contain a quaternary ammonium salt and is a chloride salt from the viewpoint of easily obtaining excellent combability, softness (before and after rinsing with water), and anti-stickiness. A quaternary ammonium salt (a quaternary ammonium salt having a chloride ion as a counter anion) may be included.

Cationic surfactant A has a cation with a structure represented by the following general formula (1) from the viewpoint of easily obtaining excellent combability, softness (before and after rinsing with water), and anti-stickiness. compound, and may include a quaternary ammonium salt having a cation having a structure represented by the following general formula (1).

[In Formula (1), R ¹¹ represents a group containing a carbon chain having 18 to 22 carbon atoms, and R ¹² , R ¹³ and R ¹⁴ each independently represents a monovalent group. ]

Examples of R ¹¹ include alkyl groups having 18 to 22 carbon atoms. Examples of monovalent groups for R ¹² , R ¹³ and R ¹⁴ include hydrogen atoms and groups containing carbon atoms (which may contain atoms other than carbon atoms). In the quaternary ammonium salt, R ¹² , R ¹³ and R ¹⁴ may each independently be a group containing carbon atoms.

Groups containing carbon atoms include alkyl groups, aryl groups, carboxy groups, carboxylic acid groups, alkoxy groups, and the like. The number of carbon atoms in the alkyl group is 1 to 10, 1 to 8, 1 to 6, 1 to 5, from the viewpoint of easily obtaining excellent combability, softness (before and after rinsing with water), and anti-stickiness. It may be 1-4, 1-3, or 1-2. Aryl groups include a benzyl group, a phenyl group, a naphthyl group, and the like. The aryl group may be a benzyl group from the viewpoint of easily obtaining excellent combability, softness (before and after rinsing with water), and anti-stickiness.

The cationic surfactant A may satisfy at least one of the following from the viewpoint of easily obtaining excellent combability, softness (before and after rinsing with water), and anti-stickiness.
Cationic surfactant A may contain a quaternary ammonium salt in which at least one selected from the group consisting of R ¹² and R ¹³ in general formula (1) is an alkyl group or an aryl group, and general formula (1) may contain a quaternary ammonium salt in which at least one selected from the group consisting of R ¹² , R ¹³ and R ¹⁴ in is an alkyl group or an aryl group.
Cationic surfactant A may contain a quaternary ammonium salt in which at least one selected from the group consisting of R ¹² and R ¹³ in general formula (1) is a methyl group or a benzyl group, and general formula (1) may contain a quaternary ammonium salt in which at least one selected from the group consisting of R ¹² , R ¹³ and R ¹⁴ in is a methyl group or a benzyl group.
Cationic surfactant A may contain a quaternary ammonium salt in which R ¹² and R ¹³ in general formula (1) are methyl groups, and R ¹² , R ¹³ and R ¹⁴ in general formula (1) are methyl groups. R ¹² and R ¹³ in general formula (1) are methyl groups and R ¹⁴ is a benzyl group.

Cationic surfactant A is stearyltrimethylammonium chloride, oleyltrimethylammonium chloride, nonadecyltrimethylammonium chloride from the viewpoint of easily obtaining excellent combability, softness (before and after rinsing with water), and anti-stickiness. , icosyltrimethylammonium chloride, henicosyltrimethylammonium chloride, behenyltrimethylammonium chloride, stearyldimethylbenzylammonium chloride, oleyldimethylbenzylammonium chloride, nonadecyldimethylbenzylammonium chloride, icosyldimethylbenzylammonium chloride, henicosyldimethyl chloride It may contain at least one selected from the group consisting of benzylammonium and behenyldimethylbenzylammonium chloride, and at least one selected from the group consisting of stearyltrimethylammonium chloride, stearyldimethylbenzylammonium chloride, and behenyltrimethylammonium chloride. OK.

The carbon number of the carbon chain B in the nonionic surfactant B may be 12 or more, 14 or more, 16 or more, or 18 or more from the viewpoint of easily obtaining excellent softness (before and after water rinsing). . The number of carbon atoms in the carbon chain B may be 18 or less, 16 or less, 14 or less, or 12 or less from the viewpoint of easily obtaining excellent combability. From these viewpoints, the carbon number of the carbon chain B may be 10 to 18, 10 to 16, 10 to 14, 10 to 12, 12 to 20, 12 to 18, 12 to 16, or 12 to 14. .

Nonionic surfactant B is a surfactant that does not have a group that dissociates into ions in water. The nonionic surfactant B may satisfy at least one of the following from the viewpoint of easily obtaining excellent combability and softness (before and after rinsing with water).
Nonionic surfactant B is selected from the group consisting of polyoxyalkylene alkyl ethers, fatty acid monoalkanolamides, fatty acid dialkanolamides, polyoxyalkylenedialkylamines, dipolyoxyalkylenealkylamines, and polyoxyalkylene fatty acid esters. At least one kind may be included.
Nonionic surfactant B may contain polyoxyalkylene alkyl ether, and at least selected from the group consisting of polyoxyethylene decyl ether, polyoxyethylene lauryl ether, polyoxyethylene cetyl ether, and polyoxyethylene stearyl ether may contain one
The nonionic surfactant B may contain at least one selected from the group consisting of fatty acid monoalkanolamides and fatty acid dialkanolamides, and may contain coconut oil fatty acid diethanolamide.
The nonionic surfactant B may contain at least one selected from the group consisting of polyoxyalkylenedialkylamines and dipolyoxyalkylenealkylamines, and may contain dipolyoxyethylenelaurylamine.
The nonionic surfactant B may contain a polyoxyalkylene fatty acid ester and may contain a polyoxyethylene laurate ester.

Nonionic surfactant B is selected from the group consisting of ether compounds, ester compounds, amide compounds, and amine compounds from the viewpoint of easy combability and softness (before and after rinsing with water). It may contain at least one structure represented by the following general formula (2a), the structure represented by the following general formula (2b), the structure represented by the following general formula (2c), and the following general formula (2d ) may contain a compound having at least one selected from the group consisting of structures represented by

[In the formula, R ^21a , R ^21b , R ^21c and R ^21d each independently represent a hydrophobic moiety containing a carbon chain having 10 to 20 carbon atoms (carbon chain B), and R ^22a , R ^22b , R ^22c , R ^23c and R ^22d each independently represent a hydrophilic moiety, and R ^23d represents a hydrophobic or hydrophilic moiety. ]

Hydrophobic moieties containing a carbon chain with 10 to 20 carbon atoms (carbon chain B) include hydrocarbon groups such as alkyl groups. A hydrocarbon group (such as an alkyl group) may be linear, branched or cyclic.

The hydrophilic portion may be a group having a hydrophilic group or a hydrophilic group. Hydrophilic groups include (poly)oxyalkylene groups, hydroxy groups, carboxy groups, carboxylic acid groups, phosphoric acid groups, phosphoric acid groups, sulfonic acid groups, sulfonic acid groups, and the like. (Poly)oxyalkylene groups include (poly)oxyethylene groups and (poly)oxypropylene groups.

The nonionic surfactant B is polyoxyethylene decyl ether, polyoxyethylene lauryl ether, polyoxyethylene laurate, from the viewpoint of easily obtaining excellent combability and softness (before and after rinsing with water). It may contain at least one selected from the group consisting of dipolyoxyethylene laurylamine, polyoxyethylene cetyl ether, coconut oil fatty acid diethanolamide, and polyoxyethylene stearyl ether.

The HLB value of nonionic surfactant B is 14.0 to 19.0. That is, in the hair fiber and fiber treatment agent according to the present embodiment, at least one type of nonionic surfactant B having an HLB value of 14.0 to 19.0 is present. When the HLB value of the nonionic surfactant B is 14.0 or more, excellent combability can be obtained, and excellent stickiness resistance and excellent dispersibility of the fiber treatment agent can be easily obtained. When the HLB value of the nonionic surfactant B is 19.0 or less, excellent combability can be obtained, and excellent stickiness resistance and excellent dispersibility of the fiber treatment agent can be easily obtained. A plurality of nonionic surfactants B having different HLB values may be present in the hair fiber and fiber treatment agent according to the present embodiment.

HLB value of nonionic surfactant B is 14.5 or more, 15.0 or more, 15.5 or more, 15.6 or more, 16.0 or more, 16.5 or more, 16.6 or more, 16.7 or more , 17.0 or greater, 17.2 or greater, or 17.4 or greater. The HLB value of the nonionic surfactant B may be 17.5 or higher, 18.0 or higher, 18.3 or higher, or 18.5 or higher. The HLB value of nonionic surfactant B may be 18.5 or less, 18.3 or less, 18.0 or less, 17.5 or less, or 17.4 or less. The HLB value of the nonionic surfactant B is 17.2 or less, 17.0 or less, 16.7 or less, 16.6 or less, 16.5 or less, 16.0 or less, 15.6 or less, or 15.6 or less. It may be 5 or less. From these viewpoints, the HLB value of nonionic surfactant B is 15.0 to 19.0, 15.0 to 18.5, 16.0 to 18.5, 15.0 to 18.0, 16.0 to 18.5. It may be 0-18.0, 16.5-18.0, or 17.0-18.0. The HLB value of nonionic surfactant B can be calculated based on the Griffin method using the formula weight of the hydrophilic moiety and the molecular weight of nonionic surfactant B. For example, nonionic surfactant B to be measured is extracted, the molecular weight is measured by GPC, the structure is specified by NMR, etc., and the calculation can be performed based on the Griffin method. The HLB value of the nonionic surfactant B can be adjusted, for example, by adjusting the length of the hydrophilic part ((poly)oxyalkylene group, etc.).

In the hair fiber and fiber treatment agent according to this embodiment, the content of the cationic surfactant A is 3 to 20% by mass based on the total amount of the nonionic surfactant B. When the content of the cationic surfactant A is 3% by mass or more, excellent softness (after rinsing with water) can be obtained. When the content of the cationic surfactant A is 20% by mass or less, excellent combability can be obtained, and excellent anti-stickiness and excellent dispersibility of the fiber treatment agent can be easily obtained. The ratio of cationic surfactant to nonionic surfactant can be measured using NMR, GC-MS, HPLC, or the like. The ratio of cationic surfactant to nonionic surfactant in hair fibers tends to be similar to that in fiber treatment agents.

The content of cationic surfactant A is based on the total amount of nonionic surfactant B from the viewpoint of suitably adjusting combability, softness (before and after rinsing with water), and stickiness resistance. It may be in the following range. The content of cationic surfactant A is 4% by mass or more, 5% by mass or more, 6% by mass or more, 8% by mass or more, 10% by mass or more, 12% by mass or more, 15% by mass or more, 16% by mass or more. , 17% by mass or more, 18% by mass or more, or 19% by mass or more. The content of the cationic surfactant A is 19% by mass or less, 18% by mass or less, 17% by mass or less, 16% by mass or less, 15% by mass or less, 12% by mass or less, 10% by mass or less, and 8% by mass or less. , 6% by mass or less, 5% by mass or less, or 4% by mass or less. From these viewpoints, the content of the cationic surfactant A is 4 to 19% by mass, 4 to 17% by mass, 4 to 15% by mass, 5 to 19% by mass, 8 to 19% by mass, 5 to 17% by mass. %, or 8 to 15 mass %.

In the fiber for hair according to the present embodiment, the total amount of the cationic surfactant A and the nonionic surfactant B is 0.002 to 4% by mass based on the total amount of the fiber for hair. When the total amount is 0.002% by mass or more, excellent combability and softness (after rinsing with water) can be obtained, and excellent softness (before rinsing with water) can be easily obtained. When the total amount is 4% by mass or less, excellent combability can be obtained, and excellent stickiness resistance can be easily obtained.

In the fiber for hair according to the present embodiment, the total amount of the cationic surfactant A and the nonionic surfactant B may be within the following range based on the total amount of the fiber for hair. The total amount is 0.005% by mass or more, 0.01% by mass or more, 0.02% by mass or more, 0.02% by mass or more, from the viewpoint of easily obtaining excellent combability and softness (before and after rinsing with water). 05% by mass or more, 0.1% by mass or more, 0.3% by mass or more, 0.5% by mass or more, 0.8% by mass or more, or 1% by mass or more. From the viewpoint of easily obtaining excellent softness (before and after rinsing with water), the total amount is 1.2% by mass or more, 1.4% by mass or more, 1.5% by mass or more, 1.6% by mass or more, or , 1.8% by mass or more. The total amount is 3.5% by mass or less, 3% by mass or less, 2.5% by mass or less, 2% by mass or less, 1.8% by mass or less, from the viewpoint of easily obtaining excellent combability and stickiness resistance. It may be 1.6% by mass or less, 1.5% by mass or less, 1.4% by mass or less, 1.2% by mass or less, or 1% by mass or less. From the viewpoint of easily obtaining excellent stickiness resistance, the total amount is 0.8% by mass or less, 0.5% by mass or less, 0.3% by mass or less, 0.1% by mass or less, 0.05% by mass or less, Alternatively, it may be 0.02% by mass or less. From these viewpoints, the total amount is 0.005 to 3 mass%, 0.01 to 2 mass%, 0.02 to 1.8 mass%, 0.1 to 1.8 mass%, 0.02 to 1 0.5% by weight, 0.1-1.5% by weight, 0.5-1.5% by weight, or 0.8-1.2% by weight.

In the fiber for hair according to the present embodiment, the content of the cationic surfactant A exceeds 0% by mass based on the total amount of the fiber for hair, and may be within the following range. The content of the cationic surfactant A is 0.0001% by mass or more, 0.0002% by mass or more, 0.0002% by mass or more, and 0.0002% by mass or more, from the viewpoint of easily obtaining excellent combability and softness (before and after rinsing with water). 0003% by mass or more, 0.0005% by mass or more, 0.0008% by mass or more, 0.001% by mass or more, 0.002% by mass or more, 0.003% by mass or more, 0.005% by mass or more, 0.008 % by mass or more, 0.01% by mass or more, 0.02% by mass or more, 0.03% by mass or more, 0.05% by mass or more, 0.07% by mass or more, or 0.09% by mass or more good. The content of cationic surfactant A is 0.1% by mass or more, 0.12% by mass or more, 0.13% by mass or more, 0 from the viewpoint of easily obtaining excellent softness (before and after rinsing with water). .14% by mass or more, 0.15% by mass or more, 0.16% by mass or more, 0.2% by mass or more, 0.25% by mass or more, 0.3% by mass or more, 0.35% by mass or more, or It may be 0.36% by mass or more. The content of the cationic surfactant A is 0.5% by mass or less, 0.45% by mass or less, 0.4% by mass or less, and 0.36% by mass, from the viewpoint of easily obtaining excellent combability and stickiness resistance. % by mass or less, 0.35% by mass or less, 0.3% by mass or less, 0.25% by mass or less, 0.2% by mass or less, 0.16% by mass or less, 0.15% by mass or less, 0.14% by mass % or less, 0.13 mass % or less, 0.12 mass % or less, 0.1 mass % or less, or 0.09 mass % or less. From the viewpoint of easily obtaining excellent anti-stickiness, the content of the cationic surfactant A is 0.07% by mass or less, 0.05% by mass or less, 0.03% by mass or less, 0.02% by mass or less, 0.01% by mass or less, 0.008% by mass or less, 0.005% by mass or less, 0.003% by mass or less, 0.002% by mass or less, 0.001% by mass or less, 0.0008% by mass or less, 0 0.0005 mass % or less, 0.0003 mass % or less, or 0.0002 mass % or less. From these viewpoints, the content of the cationic surfactant A is more than 0% by mass and 0.5% by mass or less, 0.0001 to 0.5% by mass, 0.0002 to 0.5% by mass, 0.001 ~0.5 mass%, 0.002 to 0.2 mass%, 0.005 to 0.2 mass%, 0.05 to 0.2 mass%, 0.05 to 0.1 mass%, or 0 0.07 to 0.2% by weight.

In the fiber for hair according to the present embodiment, the content of the nonionic surfactant B exceeds 0% by mass based on the total amount of the fiber for hair, and may be within the following range. The content of the nonionic surfactant B is 0.0001% by mass or more, 0.0002% by mass or more, 0.0002% by mass or more, from the viewpoint of easily obtaining excellent combability and softness (before and after rinsing with water). 0005% by mass or more, 0.0008% by mass or more, 0.001% by mass or more, 0.005% by mass or more, 0.01% by mass or more, 0.015% by mass or more, 0.02% by mass or more, 0.03 % by mass or more, 0.05% by mass or more, 0.08% by mass or more, 0.1% by mass or more, 0.2% by mass or more, 0.3% by mass or more, 0.4% by mass or more, 0.45% by mass % or more, 0.5 mass % or more, 0.7 mass % or more, or 0.9 mass % or more. The content of the nonionic surfactant B is 1% by mass or more, 1.2% by mass or more, 1.3% by mass or more, 1.4% by mass, from the viewpoint of easily obtaining excellent softness (before and after rinsing with water). % by mass or more, 1.5% by mass or more, 1.6% by mass or more, 1.7% by mass or more, 1.8% by mass or more, 2% by mass or more, 2.5% by mass or more, 3% by mass or more, or , 3.5% by mass or more. The content of the nonionic surfactant B is 5% by mass or less, 4.5% by mass or less, 4% by mass or less, 3.5% by mass or less, from the viewpoint of easily obtaining excellent combability and stickiness resistance. 3% by mass or less, 2.5% by mass or less, 2% by mass or less, 1.8% by mass or less, 1.7% by mass or less, 1.6% by mass or less, 1.5% by mass or less, 1.4% by mass Below, it may be 1.3% by mass or less, 1.2% by mass or less, or 1% by mass or less. The content of the nonionic surfactant B is 0.9% by mass or less, 0.7% by mass or less, 0.5% by mass or less, 0.45% by mass or less, from the viewpoint of easily obtaining excellent stickiness resistance. 0.4% by mass or less, 0.3% by mass or less, 0.2% by mass or less, 0.1% by mass or less, 0.08% by mass or less, 0.05% by mass or less, 0.03% by mass or less, 0 .02% by mass or less, 0.015% by mass or less, 0.01% by mass or less, 0.005% by mass or less, 0.001% by mass or less, 0.0008% by mass or less, 0.0005% by mass or less, or It may be 0.0002% by mass or less. From these viewpoints, the content of the nonionic surfactant B is more than 0% by mass and 5% by mass or less, 0.01 to 5% by mass, 0.1 to 5% by mass, 0.1 to 1.5% by mass. , 0.5 to 1.5% by weight, or 0.5 to 1.3% by weight.

In the fiber treatment agent according to this embodiment, the total amount of cationic surfactant A and nonionic surfactant B is 0.1 to 40% by mass based on the total amount of the fiber treatment agent. When the total amount is 0.1% by mass or more, excellent combability and softness (after rinsing with water) can be obtained, and excellent softness (before rinsing with water) can be easily obtained. When the total amount is 40% by mass or less, excellent combability can be obtained, and excellent stickiness resistance can be easily obtained.

In the fiber treatment agent according to the present embodiment, the total amount of the cationic surfactant A and the nonionic surfactant B may be within the following range based on the total amount of the fiber treatment agent. The total amount is 0.3% by mass or more, 0.5% by mass or more, 1% by mass or more, 3% by mass or more from the viewpoint of easy combability and softness (before and after water rinsing). , 5% by mass or more, 6% by mass or more, 6.5% by mass or more, 7% by mass or more, 7.5% by mass or more, 8% by mass or more, 8.5% by mass or more, 9% by mass or more, or 9 0.5% by mass or more. The total amount is 10% by mass or more, 15% by mass or more, 20% by mass or more, 25% by mass or more, 30% by mass or more, 35% by mass or more, from the viewpoint of easily obtaining excellent softness (before and after water rinsing). , or 37% by mass or more. The total amount is 38% by mass or less, 37% by mass or less, 35% by mass or less, 30% by mass or less, 25% by mass or less, 20% by mass or less, 15% by mass or less, from the viewpoint of easily obtaining excellent combability and stickiness resistance. % by mass or less, or 10% by mass or less. The total amount is 9.5% by mass or less, 9% by mass or less, 8.5% by mass or less, 8% by mass or less, 7.5% by mass or less, 7% by mass or less from the viewpoint of easily obtaining excellent stickiness resistance. , 6.5% by mass or less, 6% by mass or less, 5% by mass or less, 3% by mass or less, 1% by mass or less, or 0.5% by mass or less. From these viewpoints, the total amount is 0.5 to 40% by mass, 1 to 38% by mass, 1 to 30% by mass, 1 to 15% by mass, 5 to 38% by mass, 8 to 38% by mass, 5 to 30% by mass. % by weight, or from 5 to 15% by weight.

In the fiber treatment agent according to the present embodiment, the content of the cationic surfactant A exceeds 0% by mass based on the total amount of the fiber treatment agent, and may be within the following range. The content of the cationic surfactant A is 0.01% by mass or more, 0.05% by mass or more, 0.05% by mass or more, and 0.05% by mass or more, from the viewpoint of easily obtaining excellent combability and softness (before and after rinsing with water). 1% by mass or more, 0.2% by mass or more, 0.3% by mass or more, 0.4% by mass or more, 0.5% by mass or more, 0.6% by mass or more, 0.7% by mass or more, 0.8 It may be 0.9% by mass or more, or 0.9% by mass or more. The content of the cationic surfactant A is 1% by mass or more, 1.2% by mass or more, 1.4% by mass or more, 1.5% by mass or more, from the viewpoint of easily obtaining excellent softness (before and after rinsing with water). % by mass or more, 1.6% by mass or more, 1.8% by mass or more, 2% by mass or more, 2.5% by mass or more, 2.7% by mass or more, 3% by mass or more, or 3.4% by mass or more can be The content of the cationic surfactant A is 5% by mass or less, 4.5% by mass or less, 4% by mass or less, 3.5% by mass or less, from the viewpoint of easily obtaining excellent combability and stickiness resistance. 3.4% by mass or less, 3% by mass or less, 2.7% by mass or less, 2.5% by mass or less, 2% by mass or less, 1.8% by mass or less, 1.6% by mass or less, 1.5% by mass Below, it may be 1.4% by mass or less, 1.2% by mass or less, or 1% by mass or less. From the viewpoint of easily obtaining excellent stickiness resistance, the content of the cationic surfactant A is 0.9% by mass or less, 0.8% by mass or less, 0.7% by mass or less, 0.6% by mass or less, It may be 0.5% by mass or less, 0.4% by mass or less, 0.3% by mass or less, 0.2% by mass or less, 0.1% by mass or less, or 0.05% by mass or less. From these viewpoints, the content of the cationic surfactant A is more than 0% by mass and 5% by mass or less, 0.05 to 5% by mass, 0.1 to 5% by mass, 0.1 to 4% by mass, 0 .1-3% by weight, 0.1-2% by weight, 0.5-2% by weight, or 0.1-1% by weight.

In the fiber treatment agent according to the present embodiment, the content of the nonionic surfactant B exceeds 0% by mass based on the total amount of the fiber treatment agent, and may be within the following range. The content of the nonionic surfactant B is 0.1% by mass or more, 0.4% by mass or more, 0.1% by mass or more, and 0.4% by mass or more, from the viewpoint of easily obtaining excellent combability and softness (before and after rinsing with water). 5% by mass or more, 1% by mass or more, 2% by mass or more, 3% by mass or more, 4% by mass or more, 5% by mass or more, 6% by mass or more, 7% by mass or more, 8% by mass or more, 8.5% by mass or more, or 9% by mass or more. The content of the nonionic surfactant B is 9.5% by mass or more, 10% by mass or more, 12% by mass or more, 14% by mass or more, from the viewpoint of easily obtaining excellent softness (before and after water rinsing). It may be 15% by mass or more, 16% by mass or more, 18% by mass or more, 20% by mass or more, 25% by mass or more, 27% by mass or more, 30% by mass or more, or 34% by mass or more. The content of the nonionic surfactant B is less than 40% by mass, 35% by mass or less, 34% by mass or less, 30% by mass or less, or 27% by mass or less from the viewpoint of easily obtaining excellent combability and stickiness resistance. , 25% by mass or less, 20% by mass or less, 18% by mass or less, 16% by mass or less, 15% by mass or less, 14% by mass or less, 12% by mass or less, 10% by mass or less, or 9.5% by mass or less It's okay. The content of the nonionic surfactant B is 9% by mass or less, 8.5% by mass or less, 8% by mass or less, 7% by mass or less, 6% by mass or less, 5% by mass or less, from the viewpoint of easily obtaining excellent stickiness resistance. % by mass or less, 4% by mass or less, 3% by mass or less, 2% by mass or less, 1% by mass or less, or 0.5% by mass or less. From these viewpoints, the content of the nonionic surfactant B is more than 0% by mass and less than 40% by mass, 0.1% by mass or more and less than 40% by mass, 1 to 35% by mass, 5 to 35% by mass, 5 to It may be 30% by weight, 5-20% by weight, 5-15% by weight, or 1-10% by weight.

In the fiber treatment agent according to the present embodiment, the water content may be within the following ranges based on the total amount of the fiber treatment agent. The water content is 60% by mass or more, 62% by mass or more, 65% by mass or more, 70% by mass or more, 75% by mass or more, or 80% by mass or more from the viewpoint of easily obtaining excellent combability and stickiness resistance. , 85% by mass or more, or 90% by mass or more. The water content is 92% by mass or more, 93% by mass or more, 93.5% by mass or more, 94% by mass or more, 95% by mass or more, 97% by mass or more, 99% by mass or more, from the viewpoint of easily obtaining excellent anti-stickiness. It may be 99.5% by mass or more, or 99.5% by mass or more. The water content is 99.9% by mass or less, 99.5% by mass or less, 99% by mass or less, and 97% by mass, from the viewpoint of easy combability and softness (before and after rinsing with water). % or less, 95 mass % or less, 94 mass % or less, 93.5 mass % or less, 93 mass % or less, 92 mass % or less, or 90 mass % or less. The water content is 85% by mass or less, 80% by mass or less, 75% by mass or less, 70% by mass or less, 65% by mass or less, or It may be 62% by mass or less. From these points of view, the water content is 60 to 99.9 mass%, 62 to 99 mass%, 70 to 99 mass%, 85 to 99 mass%, 62 to 95 mass%, 62 to 92 mass%, 70 It may be up to 95% by weight, or 85-95% by weight.

The hair fibers according to the present embodiment may contain other additives (components that do not correspond to cationic surfactant A or nonionic surfactant B) present on at least part of the surface of the base fiber. , the fiber treatment agent according to the present embodiment may have other additives (components that do not correspond to cationic surfactant A or nonionic surfactant B). Examples of such additives include cationic surfactants that do not fall under cationic surfactant A, nonionic surfactants that do not fall under nonionic surfactant B, antibacterial finishing agents, deodorizing finishing agents, and antifungal finishing agents. agents, UV cut agents, softeners, SR processing agents, fragrance processing agents, flame retardants, antifoaming agents, fragrances, and the like. In the hair fibers according to this embodiment, at least one selected from the group consisting of zeolite and zirconium carbide may not be present on the surface of the base fiber, and the base fiber is selected from the group consisting of zeolite and zirconium carbide. It does not have to contain at least one. In the hair fiber according to the present embodiment, the alcohol composed only of carbon atoms, hydrogen atoms and oxygen atoms may not exist on the surface of the base fiber, and the fiber treatment agent according to the present embodiment contains carbon atoms and hydrogen atoms. and may not contain alcohol consisting only of oxygen atoms.

In the method for producing hair fibers according to the present embodiment, the fiber treatment agent according to the present embodiment is brought into contact with the surface of the base fiber. That is, the method for producing hair fibers according to the present embodiment includes a fiber treatment step of bringing the surface of the base fiber into contact with the fiber treatment agent according to the present embodiment. In the fiber treatment step, the fiber treatment agent in a single-phase state can be brought into contact with the surface of the base fiber.

In the fiber treatment step, the fiber treatment agent can be applied to at least part of the surface of the base fiber. In this case, conventionally known means for applying a liquid to the fibers can be used. For example, means for applying the fiber treatment agent to the base fibers by means of a roll having a surface to which the fiber treatment agent adheres (roll transfer method); means for immersing the base fibers in a liquid tank containing the fiber treatment agent; brushes, brushes, etc. means for adhering the fiber treatment agent to the substrate fibers through the applicator.

The method for producing a fiber for hair according to the present embodiment may include a spinning step of spinning a composition containing the material of the base fiber to obtain the base fiber before the fiber treatment step. In the spinning process, the composition containing the base fiber material can be melt spun (melt deformed).

The method for producing hair fibers according to the present embodiment may include a kneading step of melt-kneading a composition containing the material of the base fiber before the spinning step. As an apparatus for melt-kneading, various general kneaders can be used. Examples of kneaders include single-screw extruders, twin-screw extruders, rolls, Banbury mixers, and kneaders.

The method for producing hair fibers according to the present embodiment may include a drawing step for drawing the yarn (undrawn yarn) obtained in the spinning step before the fiber treatment step.

The draw ratio in the drawing step may be 1.5 times or more, or 2.0 times or more, from the viewpoint that the strength of the fiber is likely to occur. The draw ratio may be 5.0 times or less, or 4.0 times or less from the viewpoint of preventing thread breakage during the drawing process. From these points of view, the draw ratio may be 1.5 to 5.0 times, or 2.0 to 4.0 times.

The drawing process may be performed by a two-step method in which the undrawn yarn is once wound on a bobbin and then drawn in a step that is not continuous with the spinning process, and the undrawn yarn is not wound on the bobbin and is continuous with the spinning process. It may be carried out by a direct spinning drawing method in which drawing is performed at. The stretching treatment may be carried out by a single-stage stretching method in which the film is stretched to the target stretch ratio in one step, or by a multi-stage stretching method in which the film is stretched to the target stretch ratio by stretching two or more times.

The temperature of the stretching treatment may be 80-120°C. When the temperature is 80° C. or higher, it is easy to ensure sufficient strength of the fiber and yarn breakage is less likely to occur. When the temperature is 120° C. or less, it is easy to obtain a suitable feel of the fibers.

The method for producing fibers for hair according to the present embodiment may include a heat treatment step of heat-treating (annealing) the yarn obtained in the drawing step (drawn yarn) after the drawing step. By performing the heat treatment step, the heat shrinkage of the drawn yarn can be reduced.

The heat treatment temperature may be 100°C or higher, or 120°C or higher. The heat treatment temperature may be 200° C. or lower, or 150° C. or lower. The heat treatment may be carried out continuously after the stretching treatment, or may be carried out at intervals after winding.

A hair accessory according to this embodiment includes hair fibers according to this embodiment. The hair accessory according to the present embodiment is an article that can be attached to and detached from the head, and may be in the form of the hair fibers according to the present embodiment (for example, a fiber bundle of hair fibers). Examples of hair accessories include wigs, hair wigs, hairpieces, braids, hair extensions, hair extensions, and the like.

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

<Preparation of base fiber>
The following fibers were prepared as base fibers.
Base fiber A: A fiber using polyvinyl chloride (Taiyo Vinyl Co., Ltd., trade name "TH-700"), from a nozzle having an outlet cross section with a weak axis moment of inertia of 10 × 10 ^-4 mm ⁴ Spun fiber (fiber made by solution spinning method), average fineness 40-70 decitex (average value of fineness of 100 fibers)
Base fiber B: Fiber using a mixture of polyvinyl chloride (Taiyo Vinyl Co., Ltd., trade name “TH-700”) and acrylonitrile-styrene copolymer (Denka Co., Ltd., trade name “GR-AT-6S”) , Polyvinyl chloride content: 50% by mass or more, Acrylonitrile-styrene copolymer content: 30% by mass, From a nozzle having an outlet cross-section with a weak axis moment of inertia of 10 × 10 ^-4 mm ⁴ Spun fiber (fiber made by solution spinning method), average fineness 40-70 decitex (average value of fineness of 100 fibers)
Base fiber C: A fiber using acrylonitrile-styrene copolymer (Denka Co., Ltd., product name “GR-AT-6S”), exit cross-section having a weak axis secondary moment of area of 10 × 10 ^-4 mm ⁴ Fibers spun from nozzles (fibers made by solution spinning), average fineness 40-70 decitex (average fineness of 100 fibers)
Base fiber D: A fiber using PET (Mitsui Chemicals, Inc., trade name “J125S”), a fiber spun from a nozzle having an exit cross-section with a weak axis moment of inertia of 10×10 ⁻⁴ mm ⁴ (fibers produced by melt spinning method), average fineness 40-70 decitex (average value of fineness of 100 fibers)
Base fiber E: A fiber using a polyamide resin (Asahi Kasei Chemicals Co., Ltd., product name "Leona 1500"), spun from a nozzle having an outlet cross section with a weak axis secondary moment of area of 10 × 10 ^-4 mm ⁴ fiber (fiber made by solution spinning method), average fineness 40-70 decitex (average value of fineness of 100 fibers)
Base fiber F: A fiber using polypropylene (Sumitomo Chemical Co., Ltd., trade name "Sumitomo Noblen S131"), spun from a nozzle having an outlet cross section with a weak axis moment of inertia of 10 × 10 ^-4 mm ⁴ fibers (fibers produced by melt spinning), average fineness 40-70 decitex (average value of fineness of 100 fibers)
Base fiber G: fiber using a vinyl chloride-acrylonitrile copolymer (copolymerization ratio 50:50, weight average molecular weight 80000 to 130000), outlet having a weak axis geometrical moment of inertia of 10 × 10 ^-4 mm ⁴ Fibers spun from a nozzle having a cross section (fibers produced by solution spinning), average fineness 40-70 decitex (average fineness of 100 fibers)
Base fiber H: Human hair, Sun Taiyang's product name "VELVET REMI" used after washing with water at 40 ° C.

<Preparation of fiber treatment agent>
Fiber treatment agents were prepared by mixing surfactants shown in Tables 1 to 5 with water. The surfactant content (the total amount of the cationic surfactant and the nonionic surfactant) and the water content in the fiber treatment agent are based on the total amount of the fiber treatment agent. The ratio of cationic surfactant to nonionic surfactant in the fiber treatment agent (content of cationic surfactant/content of nonionic surfactant) is as shown in each table. In each of the examples and comparative examples, surfactants marked with "o" in the table were used. The following reagents were used as surfactants. In Example 7, polyoxyethylene lauryl ether (carbon chain: 12 carbon atoms, HLB: 17.4) and polyoxyethylene stearyl ether (carbon chain: 18 carbon atoms, HLB: 16.6) were used.

(Cationic surfactant)
・ Cetyltrimethylammonium chloride aqueous solution: Carbon chain number 16, Nikko Chemicals Co., Ltd., trade name “CA-2330”, active ingredient amount about 29%
・ A mixture of stearyltrimethylammonium chloride, isopropyl alcohol and water: Carbon chain number 18, Toho Chemical Co., Ltd., trade name “Catinal STC-25W”, active ingredient amount about 25%
・Mixture of stearyldimethylbenzylammonium chloride and isopropyl alcohol: Carbon chain number 18, Sanyo Chemical Co., Ltd., trade name “Cation S”, active ingredient content about 91%
・ A mixture of behenyltrimethylammonium chloride and isopropyl alcohol: Toho Chemical Co., Ltd., trade name “Catinal DC-80”, carbon chain number 22, active ingredient amount about 80%
・Tetracosyltrimethylammonium chloride: 24 carbon atoms in the carbon chain, prepared in-house

(Nonionic surfactant)
・Polyoxyethylene octyl ether: carbon chain number 8, HLB 17.0, in-house preparation ・Polyoxyethylene decyl ether: carbon chain number 10, HLB 17.0, in-house preparation ・Polyoxyethylene lauryl ether: carbon Chain carbon number 12, HLB 13.1, Aoki Oil Industry Co., Ltd., trade name “Brownon EL-1509P”
・Polyoxyethylene lauryl ether: carbon chain number 12, HLB 15.6, in-house preparation ・Polyoxyethylene lauryl ether: carbon chain number 12, HLB 17.4, Aoki Oil Industry Co., Ltd., product name “Brownon EL” -1530"
・Polyoxyethylene lauryl ether: carbon chain number 12, HLB 18.5, in-house preparation ・Polyoxyethylene lauryl ether: carbon chain carbon number 12, HLB 19.5, in-house preparation ・Polyoxyethylene laurate ester: Carbon chain carbon number 12, HLB 17.0, self-prepared product Dipolyoxyethylene laurylamine: carbon chain carbon number 12, HLB 17.0, self-prepared product polyoxyethylene cetyl ether: carbon chain carbon number 16, HLB 15.5, Aoki Oil Industry Co., Ltd., trade name “Brownon CH-320L”
・Polyoxyethylene cetyl ether: Carbon chain number 16, HLB 16.7, Aoki Oil Industry Co., Ltd., trade name “Brownon CH-330L”
・Polyoxyethylene cetyl ether: carbon chain number 16, HLB 18.3, in-house preparation ・Coconut oil fatty acid diethanolamide: carbon chain carbon number 12-18, HLB about 17.0, in-house preparation ・Polyoxyethylene Stearyl ether: Carbon chain number 18, HLB 16.6, Aoki Oil Industry Co., Ltd., trade name "Brownon SR-730"
・Polyoxyethylene behenyl ether: carbon chain number 22, HLB 17.0, in-house preparation ・Polyoxyethylene tetracosanoic acid ester: carbon chain number 24, HLB 17.0, in-house preparation

(Evaluation of dispersibility of fiber treatment agent)
Dispersibility was evaluated for fiber treatment agents having the same composition as the fiber treatment agents used in Examples and Comparative Examples. First, after adding a nonionic surfactant to water at 50°C, the mixture was stirred at 50°C and 300 rpm for about 3 hours. Then, after adding the cationic surfactant, the mixture was stirred at 50° C. and 300 rpm for about 6 hours, and the state of the fiber treatment agent was visually observed. An ingredient that was solid prior to addition to water was rated "A" if the ingredient that was solid prior to addition to water was generally colloidally dispersed without separating into two phases. was evaluated as "B" when it did not disperse colloidally throughout (including cases where it separated into two phases). Results are shown in each table. Comparative Example 1, in which no cationic surfactant was used, was evaluated as "A" because there was no problem with dispersibility. Regarding Comparative Example 4, when the dispersibility of the cationic surfactant was confirmed without using a nonionic surfactant, the result was evaluated as "B".

<Preparation of fiber for evaluation>
(Examples 1 to 38, 40 to 43 and Comparative Examples 1 to 15)
After drawing the above base fiber at 100° C., the above fiber treatment agent was applied to the base fiber by a roll transfer method. As conditions for roll transfer, the radius of the roll was 125 mm, the roll was immersed in the fiber treatment agent up to a height of 20 mm from the lower end of the roll, and the roll rotation speed was 0.2 to 8 m/min. Thereafter, annealing was performed at 110° C. to obtain fibers for evaluation with a single fineness of 20 to 100 decitex. The draw ratio was 3.25 times, and the relaxation rate during annealing was 25%. The relaxation rate at the time of annealing is a value calculated by "(the circumference of the roller near the outlet of the annealing furnace)/(the circumference of the roller near the inlet of the annealing furnace)".

As the content of the active ingredient in the fiber for evaluation, the attached amount of surfactant (unit: % by mass) on the surface of the fiber for evaluation is shown in each table. The adhesion amount was calculated from the following formula based on the solid content extracted from the fibers for evaluation by the hot water extraction method.
Adhesion amount [mass%] = (mass of extracted solid content [g] / mass of fiber for evaluation before extraction [g]) x 100

In the hot water extraction method described above, first, 20 g of evaluation fiber was weighed into a 300 mL beaker, and then 200 mL of pure water was added. Subsequently, the beaker was placed in a constant temperature bath at 80° C., and then stirred with a glass rod every hour for a total of 4 hours of extraction to obtain an evaluation sample. And no. After filtering the evaluation sample with a 5A filter paper, the beaker, the evaluation sample and the filter paper were washed twice with a total of 100 mL of water. The water content of the obtained filtrate was dried and solidified at 80°C. The weight of the dry matter after complete drying was taken as the weight of the extracted solids.

(Example 39)
Without stretching the base fibers, the fiber treatment agent was applied to the base fibers by a roll transfer method in the same manner as the procedure described above. After that, the fiber for evaluation was obtained by drying in an oven at 40°C.

<Evaluation of fiber for evaluation>
After shaping the above evaluation fiber into a corrugated shape, combability, softness, stickiness resistance, and weaving property were evaluated. As shaping processing, using a gear machine (NEW YAKI BRAID CRIMPING M / C-2.5 mm / SUNG JIN INDUSTRIAL CO., LTD.), gear pitch 2.5 mm, preheating 90 ° C., gear roll temperature 90 ° C., gear roll rotation speed Yaki processing was performed under the condition of 1 m/m. Results are shown in each table.

(combability)
A fiber bundle having a length of 300 mm and a mass of 10 g was obtained by bundling the above evaluation fibers (after shaping). Then, the maximum value of the resistance force [unit: gf] when combing from a position 90 mm from the tip of the fiber bundle toward the tip of the fiber bundle at a moving speed of 10 mm/sec and a moving distance of 100 mm was measured with a static and dynamic friction measuring machine. (trade name “TL201Tt” manufactured by TRINITY-LAB). It was judged that the smaller the resistance, the better the combability.

(soft)
A fiber bundle having a length of 600 mm and a mass of 120 g was obtained by bundling the evaluation fibers (after shaping). 10 hair fiber treatment technicians (with more than 5 years of practical experience) judged the texture (softness felt when the fiber bundle was touched as if it were compressed with the palm) into two ranks of “soft” and “hard”. After that, the softness (before rinsing with water) was determined according to the following criteria. Further, after rinsing the fiber bundle by repeating the operation of immersing the fiber bundle in water and then kneading and squeezing three times, the softness (after rinsing with water) was determined in the same procedure.
A: Evaluated as soft by 9 or more B: Evaluated as soft by 5 to 8 C: Evaluated as soft by 1 to 4 D: Evaluated as soft by 0

(Stickiness resistance)
A fiber bundle having a length of 600 mm and a mass of 120 g was obtained by bundling the evaluation fibers (after shaping). 10 hair fiber treatment technicians (with more than 5 years of practical experience) made a two-rank judgment of "non-sticky" and "sticky" based on the touch (degree of stickiness felt when touching the fiber bundle as if compressing it with the palm). After that, the stickiness resistance was determined according to the following criteria.
A: Evaluated by 9 or more people as not sticky B: Evaluated by 5 to 8 people as not sticky C: Evaluated by 1 to 4 people as not sticky D: Evaluated by 0 people as not sticky

(Knitability)
As the above-mentioned fibers for evaluation (after shaping processing), 35% of fibers with a length of 100 mm or more and less than 300 mm, 9% of fibers with a length of 300 mm or more and less than 350 mm, 28% of fibers with a length of 350 mm or more and less than 425 mm, and A fiber bundle (length: 500 mm, mass: 5 g) tapering toward the tip was obtained using 28% of fibers having a diameter of 425 mm or more and 500 mm or less. After weaving the fiber bundle into a braid, it was determined whether or not the tip of the fiber bundle was unraveled when the hand was released.
A: The tip cannot be unraveled even if the knitted hand is released. B: The tip can be unraveled when the knitted hand is released.

Claims

having a base fiber and a cationic surfactant and a nonionic surfactant present on at least a portion of the surface of the base fiber;
The cationic surfactant has a carbon chain with 18 to 22 carbon atoms,
The nonionic surfactant has a carbon chain with 10 to 20 carbon atoms,
The HLB value of the nonionic surfactant is 14.0 to 19.0,
The content of the cationic surfactant is 3 to 20% by mass based on the total amount of the nonionic surfactant,
A fiber for hair, wherein the total amount of the cationic surfactant and the nonionic surfactant is 0.002 to 4% by mass based on the total amount of the fiber for hair.
The base fiber contains at least one selected from the group consisting of vinyl chloride homopolymer, vinyl chloride-acrylonitrile copolymer, polyethylene terephthalate, polyamide resin, polypropylene, and acrylonitrile-styrene copolymer. Item 1. The hair fiber according to item 1.
The hair fiber according to claim 1, wherein the cationic surfactant contains a quaternary ammonium salt having a cation having a structure represented by the following general formula (1).

[In Formula (1), R 11 represents a group containing a carbon chain having 18 to 22 carbon atoms, and R 12 , R 13 and R 14 each independently represents a monovalent group. ]
4. The hair fiber according to claim 3, wherein the cationic surfactant comprises a quaternary ammonium salt in which R12 and R13 in the general formula (1) are methyl groups.
The nonionic surfactant has a structure represented by the following general formula (2a), a structure represented by the following general formula (2b), a structure represented by the following general formula (2c), and the following general formula ( 2. The hair fiber according to claim 1, comprising a compound having at least one selected from the group consisting of structures represented by 2d).

[In the formula, R 21a , R 21b , R 21c and R 21d each independently represent a hydrophobic moiety containing a carbon chain having 10 to 20 carbon atoms, and R 22a , R 22b , R 22c , R 23c and R 22d each independently represent a hydrophilic moiety, and R 23d represents a hydrophobic or hydrophilic moiety. ]
The hair fiber according to claim 1, wherein the nonionic surfactant contains a polyoxyalkylene alkyl ether.
A hair accessory comprising the hair fiber according to any one of claims 1 to 6.
containing a cationic surfactant, a nonionic surfactant, and water,
The cationic surfactant has a carbon chain with 18 to 22 carbon atoms,
The nonionic surfactant has a carbon chain with 10 to 20 carbon atoms,
The HLB value of the nonionic surfactant is 14.0 to 19.0,
The content of the cationic surfactant is 3 to 20% by mass based on the total amount of the nonionic surfactant,
A fiber treatment agent, wherein the total amount of the cationic surfactant and the nonionic surfactant is 0.1 to 40% by mass based on the total amount of the fiber treatment agent.
A method for producing hair fibers, wherein the fiber treatment agent according to claim 8 is brought into contact with the surface of base fibers.