Hair fiber and hair ornament

Abstract

To provide a fiber for hair excellent in combability and slipperiness.SOLUTION: A base fiber, a first oil component, a second oil component, and a nonionic surfactant, in which the first oil component, the second oil component, and the nonionic surfactant are present on at least a part of a surface of the base fiber, the first oil component is triglyceride, the second oil component is at least one selected from the group consisting of fatty acid alkyl and aliphatic saturated hydrocarbon, the nonionic surfactant has a carbon chain having 10 to 22 carbon atoms, the HLB value of the nonionic surfactant is 6.0 to 14.0, and the total amount of the first oil component, the second oil component, and the nonionic surfactant is 0.01 to 1.6% by mass based on the total amount of the hair fiber.SELECTED DRAWING: None

Description

[Technical Field]

[0001] The present invention relates to hair fibers, hair accessories, and the like. [Background technology]

[0002] Hair fibers (fibers used for hair) can be used in hair accessories. Patent Document 1 below discloses a technique for treating base fibers with a fiber treating agent. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2002-285470 Summary of the Invention [Problem to be solved by the invention]

[0004] In order to prevent users from feeling any discomfort, hair fibers are required to have excellent combability (the degree to which fingers can be easily run through the fiber bundle when a hand comb is run through it) and slip resistance (the degree to which the fiber does not slip when braiding, etc.).

[0005] An object of one aspect of the present invention is to provide a hair fiber that is excellent in combability and slipperiness.An object of another aspect of the present invention is to provide a hair accessory comprising such a hair fiber. [Means for solving the problem]

[0006] In some aspects, the present invention relates to the following [1] to [7], etc. [1] A hair fiber comprising a base fiber, a first oil component, a second oil component, and a nonionic surfactant, wherein the first oil component, the second oil component, and the nonionic surfactant are present on at least a portion of the surface of the base fiber, the first oil component is a triglyceride, the second oil component is at least one selected from the group consisting of fatty acid alkyls and saturated aliphatic hydrocarbons, the nonionic surfactant has a carbon chain with 10 to 22 carbon atoms, the HLB value of the nonionic surfactant is 6.0 to 14.0, and the total amount of the first oil component, the second oil component, and the nonionic surfactant is 0.01 to 1.6 mass% based on the total amount of the hair fiber. [2] The hair fiber according to [1], wherein the content of the first oil component is 3 to 90 mass%, the content of the second oil component is 3 to 90 mass%, and the content of the nonionic surfactant is 2 to 80 mass%, based on the total amount of the first oil component, the second oil component, and the nonionic surfactant. [3] The hair fiber according to [1] or [2], wherein the base fiber comprises at least one selected from the group consisting of a vinyl chloride homopolymer, a vinyl chloride-acrylonitrile copolymer, polyethylene terephthalate, a polyamide resin, polypropylene, and an acrylonitrile-styrene copolymer. [4] The fiber for hair according to any one of [1] to [3], wherein the triglyceride contains a triglyceride with an iodine value of 165 or less. [5] The hair fiber according to any one of [1] to [4], wherein the second oil component contains at least one selected from the group consisting of a fatty acid alkyl having a structure derived from a monocarboxylic acid and a fatty acid alkyl having a structure derived from a dicarboxylic acid. [6] The hair fiber according to any one of [1] to [5], further comprising a cationic surfactant present on at least a portion of the surface of the base fiber, wherein the cationic surfactant comprises a quaternary ammonium salt having a cation having a structure represented by the following general formula (Y): [ka] [In the formula, R y1and R y2 each independently represents an alkyl group; Y 1 , Y 2 , Y 3 and Y 4 each independently represents an alkylene group, and m and n each independently represent an integer of 1 or more. [7] A hair accessory comprising the hair fiber according to any one of [1] to [6]. [Effects of the Invention]

[0007] According to one aspect of the present invention, a hair fiber having excellent combability and slipperiness can be provided. According to another aspect of the present invention, a hair accessory including such a hair fiber can be provided. DETAILED DESCRIPTION OF THE INVENTION

[0008] Hereinafter, embodiments of the present invention will be described in detail.

[0009] A numerical range "A or greater" means a range exceeding A and A. A numerical range "A or less" means a range exceeding A and A. In the numerical ranges described in this specification, the upper or lower limit of a certain numerical range can be arbitrarily combined with the upper or lower limit of another numerical range. In the numerical ranges described in this specification, the upper or lower limit of the numerical range may be replaced with a value shown in the examples. "A or B" may include either A or B, or both. Unless otherwise specified, the materials exemplified in this specification can be used alone or in combination of two or more. When multiple substances corresponding to each component are present in the composition, the content of each component in the composition refers to the total amount of the multiple substances present in the composition, unless otherwise specified. The term "process" does not only refer to an independent process, but also includes processes that cannot be clearly distinguished from other processes as long as the intended effect of the process is achieved. "(Meth)acrylic acid" refers to at least one of acrylic acid and its corresponding methacrylic acid. The term "polyoxyalkylene group" and "oxyalkylene group" are collectively referred to as "(poly)oxyalkylene group." The same applies to other expressions containing "(poly)."

[0010] The hair fiber according to this embodiment comprises a base fiber, a first oil component, a second oil component, and a nonionic surfactant A, and the first oil component, the second oil component, and the nonionic surfactant A are present on at least a portion of the surface of the base fiber. In the hair fiber according to this embodiment, the first oil component is a triglyceride, the second oil component is at least one selected from the group consisting of fatty acid alkyl esters (excluding triglycerides) and saturated aliphatic hydrocarbons, the nonionic surfactant A has a carbon chain with 10 to 22 carbon atoms, the HLB value of the nonionic surfactant A is 6.0 to 14.0, and the total amount of the first oil component, the second oil component, and the nonionic surfactant A is 0.01 to 1.6% by mass based on the total mass of the hair fiber.

[0011] The hair fiber according to this embodiment has excellent combability and slip resistance. Regarding slip resistance, the hair fiber according to this embodiment can achieve a dynamic friction coefficient of, for example, 0.36 or less, as evaluated in the examples described below. By using the hair fiber with such a dynamic friction coefficient, it is easy to form a good braid or the like.

[0012] From the viewpoint of facilitating the formation of a braid or the like, the dynamic friction coefficient may be 0.20 or more, or 0.25 or more. The dynamic friction coefficient may be 0.35 or less, 0.30 or less, 0.25 or less, or 0.24 or less. From these viewpoints, the dynamic friction coefficient may be 0.20 to 0.36, 0.20 to 0.35, 0.25 to 0.35, or 0.20 to 0.24.

[0013] One aspect of the fiber for hair according to this embodiment has excellent stickiness resistance. One aspect of the fiber for hair according to this embodiment has excellent antistatic properties. Regarding antistatic properties, the fiber for hair according to this embodiment has an antistatic property of, for example, 1×10 11 Ω / sq. (square) or less (preferably 1×10 11 Ω / sq. less than 1×10 10 Ω / sq. or less, 1×10 10 Ω / sq. less than 1×10 9 Ω / sq. or less, 1×10 9 Surface resistance values ​​(less than Ω / sq., etc.) can be obtained.

[0014] The fiber treatment agent according to this embodiment is a fiber treatment agent for obtaining the hair fiber according to this embodiment. The fiber treatment agent according to this embodiment contains the same first oil component, second oil component, and nonionic surfactant A as the hair fiber according to this embodiment. The fiber treatment agent according to this embodiment makes it possible to obtain the hair fiber according to this embodiment, and to obtain hair fiber that is excellent in combability and slipperiness.

[0015] The fiber for hair according to this embodiment can be used as hair (e.g., artificial hair) and can also be used to obtain hair (e.g., artificial hair). The fiber for hair according to this embodiment may be a fiber after drawing treatment or an undrawn fiber. The single fineness of the fiber for hair according to this embodiment may be 20 to 100 dtex after drawing treatment.

[0016] Materials for the base fiber in the hair fiber according to this embodiment include vinyl chloride resin, polyester resin, polyamide resin, polyolefin resin, vinyl acetate resin (such as ethylene-vinyl acetate copolymer (EVA)), acrylonitrile resin (excluding resins that fall under vinyl chloride resin; such as acrylonitrile-butadiene rubber (NBR), acrylonitrile-butadiene-styrene resin (ABS), and acrylonitrile-styrene copolymer (AS)), thermoplastic polyurethane (TPU), thermoplastic polyester elastomer (TPEE), methyl methacrylate-butadiene-styrene resin (MBS), polymethyl methacrylate (PMMA), and human hair materials (such as keratin). The base fiber may contain at least one of these materials as the main component (main resin raw material). That is, the content of at least one of these materials may be 50% by mass or more, or even more than 50% by mass, based on the total mass of the base fiber.

[0017] Vinyl chloride resins are polymers having structural units derived from vinyl chloride, i.e., polymers having vinyl chloride as a monomer unit. Vinyl chloride resins can be obtained by bulk polymerization, solution polymerization, suspension polymerization, emulsion polymerization, etc., and may be obtained by suspension polymerization from the viewpoint of excellent initial colorability of the fiber. The base fiber may contain a mixture of vinyl chloride resin and a component capable of forming a polymer alloy with the vinyl chloride resin (e.g., acrylonitrile-styrene copolymer).

[0018] Examples of vinyl chloride resins include homopolymers of vinyl chloride (homopolymers, polyvinyl chloride), copolymers of vinyl chloride with other monomers, and mixtures of these. Examples of copolymers of vinyl chloride with other monomers include copolymers of vinyl chloride and vinyl esters (e.g., vinyl chloride-vinyl acetate copolymer, vinyl chloride-vinyl propionate copolymer); copolymers of vinyl chloride and (meth)acrylic acid compounds (e.g., (meth)acrylic acid, (meth)acrylic acid esters) (e.g., vinyl chloride-butyl acrylate copolymer, vinyl chloride-2-ethylhexyl acrylate copolymer); copolymers of vinyl chloride and olefins (e.g., vinyl chloride-ethylene copolymer, vinyl chloride-propylene copolymer); and vinyl chloride-acrylonitrile copolymer (modacrylic). Vinyl chloride resins do not need to contain structural units derived from (meth)acrylic acid compounds. The content of monomers other than vinyl chloride in the copolymer can be determined depending on the required qualities, such as moldability and yarn properties. The vinyl chloride resin may contain at least one selected from the group consisting of a vinyl chloride homopolymer and a vinyl chloride-acrylonitrile copolymer, from the viewpoint of easily achieving excellent combability, non-slip properties, stickiness resistance, or antistatic properties.

[0019] Examples of polyester resins include polyethylene terephthalate (PET), polybutylene terephthalate, polyethylene-2,6-naphthalate, polymethylene terephthalate, and glycol-modified polyethylene terephthalate (PETG).

[0020] Examples of polyamide resins include nylon 6, nylon 66, nylon 11, nylon 12, nylon 6 / 10, and nylon 6 / 12.

[0021] Examples of polyolefin resins include polyethylene (PE) and polypropylene (PP).

[0022] From the viewpoint of easily achieving excellent combability, slip resistance, stickiness resistance, or antistatic properties, the base fiber may comprise at least one selected from the group consisting of vinyl chloride resins, polyester resins, polyamide resins, polyolefin resins, and acrylonitrile resins, or may comprise at least one selected from the group consisting of vinyl chloride resins, polyester resins, polyamide resins, polyolefin resins, and acrylonitrile-styrene copolymers, or may comprise 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, or may comprise at least one selected from the group consisting of vinyl chloride homopolymers and acrylonitrile-styrene copolymers.

[0023] The base fiber may contain a material (hereinafter referred to as "artificial hair material") different from human hair material (e.g., keratin). Users of hair accessories containing base fiber containing artificial hair material expect combability and slipperiness similar to that of human hair. However, even when base fiber containing artificial hair material is treated with ingredients contained in hair care products (hair conditioners, hair treatments, etc.) used to improve human hair, the combability and slipperiness may not be improved to the same extent as human hair. Therefore, in order to improve base fiber containing artificial hair material, a method suitable for artificial hair material is required. In contrast, one aspect of the hair fiber according to this embodiment can achieve excellent combability and slipperiness even when using an artificial hair material.

[0024] The content of the artificial hair material, vinyl chloride resin, polyester resin, polyamide resin, polyolefin resin, or acrylonitrile resin in the base fiber may be 50% by mass or more, more than 50% by mass, 60% by mass or more, 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, based on the total amount of the base fiber. The base fiber may be composed solely of an artificial hair material, vinyl chloride resin, polyester resin, polyamide resin, polyolefin resin, or acrylonitrile resin (substantially 100% by mass of the base fiber is artificial hair material, vinyl chloride resin, polyester resin, polyamide resin, polyolefin resin, or acrylonitrile resin).

[0025] The average fineness of the base fiber may be 300 decitex or less, 200 decitex or less, or 100 decitex or less when unstretched, from the viewpoint that the draw ratio can be reduced to obtain finer hair fibers.

[0026] The hair fiber according to this embodiment has a first oil component, a second oil component, and a nonionic surfactant A present on at least a portion of the surface of the base fiber. The first oil component, the second oil component, and the nonionic surfactant A may be present at the same location on the surface of the base fiber, or may be present at different locations. In the hair fiber and fiber treatment agent according to this embodiment, at least one type of first oil component, at least one type of second oil component, and at least one type of nonionic surfactant A are present.

[0027] The triglyceride of the first oil component is a compound having a structure in which one molecule of glycerol is ester-bonded to three molecules of fatty acid. The triglyceride may include a compound having a structure derived from a fatty acid having no unsaturated bond, or may include a compound having a structure derived from a fatty acid having a carbon chain containing an unsaturated bond.

[0028] The number of unsaturated bonds in the carbon chain of a fatty acid having an unsaturated bond may be 5 or less, 4 or less, 3 or less, or 2 or less. From the viewpoint of easily achieving excellent combability, the number of unsaturated bonds may be 1 or more, 2 or more, or 3 or more. From these viewpoints, the number of unsaturated bonds may be 1 to 5, 1 to 4, 1 to 3, 1 to 2, 2 to 5, 2 to 4, 2 to 3, 3 to 5, or 3 to 4.

[0029] From the viewpoint of easily achieving excellent combability or slipperiness, the triglyceride may contain a compound having a structure derived from a fatty acid having a carbon number in the following ranges. The number of carbon atoms in the fatty acid may be 30 or less, 28 or less, 26 or less, 24 or less, 22 or less, 20 or less, 18 or less, 16 or less, 14 or less, 12 or less, 10 or less, or 8 or less. The number of carbon atoms in the fatty acid may be 1 or more, 2 or more, 4 or more, 6 or more, 8 or more, 10 or more, 12 or more, 14 or more, 16 or more, or 18 or more. From these viewpoints, the number of carbon atoms in the fatty acid may be 1 to 30, 8 to 30, 12 to 30, 18 to 30, 1 to 18, 8 to 18, 12 to 18, 1 to 12, 8 to 12, or 1 to 8.

[0030] Examples of triglycerides include coconut oil, olive oil (olive fruit oil), sunflower oil (sunflower seed oil), rosehip oil (rosa canina fruit oil), rice oil, corn oil, canola oil, rice bran oil, soybean oil, refined soybean oil, safflower oil, sesame oil, cottonseed oil, rapeseed oil, refined rapeseed oil, peanut oil, grapeseed oil, perilla oil, evening primrose oil, jojoba oil, wheat germ oil, hemp seed oil, tea seed oil, palm oil, palm kernel oil, fish oil, whale oil, beef tallow, lard, etc. The triglyceride may contain at least one selected from the group consisting of coconut oil, olive oil, sunflower oil, and rosehip oil, from the viewpoint of easily achieving excellent combability or slipperiness.

[0031] The fatty acid alkyl of the second oil component is a compound having a structure formed by dehydration condensation of a fatty acid and a fatty alcohol, and has a structure derived from a fatty acid and a structure derived from a fatty alcohol. The second oil component can contain at least one selected from the group consisting of saturated fatty acid alkyl and unsaturated fatty acid alkyl. From the viewpoint of easily achieving excellent combing ease or slipperiness, the second oil component may contain a fatty acid alkyl having a structure derived from a monocarboxylic acid (fatty acid), may contain a fatty acid alkyl having a structure derived from a dicarboxylic acid (fatty acid), or may contain at least one selected from the group consisting of a fatty acid alkyl having a structure derived from a monocarboxylic acid (fatty acid) and a fatty acid alkyl having a structure derived from a dicarboxylic acid (fatty acid).

[0032] The fatty acid alkyl may include a compound having a structure derived from a fatty acid having a carbon number within the following ranges. From the viewpoint of easily achieving excellent combability, the carbon number of the fatty acid may be 6 or more, 8 or more, 10 or more, 12 or more, 14 or more, 16 or more, or 18 or more. The carbon number of the fatty acid may be 30 or less, 26 or less, 22 or less, 20 or less, 18 or less, 16 or less, or 14 or less. From these viewpoints, the carbon number of the fatty acid may be 6 to 30, 12 to 30, 14 to 30, 18 to 30, 6 to 20, 12 to 20, 14 to 20, 18 to 20, 6 to 18, 12 to 18, 14 to 18, 6 to 14, or 12 to 14.

[0033] The fatty acid alkyl may include a compound having a structure derived from an aliphatic alcohol having a carbon number within the following ranges. From the viewpoint of easily achieving excellent combability, the carbon number of the aliphatic alcohol may be 1 or more, 2 or more, 3 or more, 4 or more, 5 or more, 6 or more, 7 or more, or 8 or more. The carbon number of the aliphatic alcohol may be 12 or less, 10 or less, 9 or less, 8 or less, 7 or less, 6 or less, 5 or less, 4 or less, or 3 or less. From these viewpoints, the carbon number of the aliphatic alcohol may be 1 to 12, 3 to 12, 8 to 12, 1 to 8, 3 to 8, or 1 to 3.

[0034] Examples of fatty acid alkyl groups include alkyl laurates such as methyl laurate, ethyl laurate, propyl laurate, isopropyl laurate, butyl laurate, hexyl laurate, heptyl laurate, octyl laurate, ethylhexyl laurate, decyl laurate, dodecyl laurate, myristyl laurate, cetyl laurate, hexyldecyl laurate, octyldodecyl laurate, and caprylyl laurate; methyl myristate, ethyl myristate, propyl myristate, and myristyl laurate. alkyl myristates such as isopropyl myristate, butyl myristate, hexyl myristate, octyl myristate, ethylhexyl myristate, dodecyl myristate, myristyl myristate, cetyl myristate, isocetyl myristate, hexyldecyl myristate, octyldodecyl myristate, and myristyl myristate; methyl palmitate, ethyl palmitate, propyl palmitate, isopropyl palmitate, butyl palmitate, hexyl palmitate, and methyl palmitate Alkyl palmitates such as heptyl, octyl palmitate, ethylhexyl palmitate, dodecyl palmitate, myristyl palmitate, cetyl palmitate, hexyldecyl palmitate, and octyldodecyl palmitate; methyl stearate, ethyl stearate, propyl stearate, isopropyl stearate, butyl stearate, hexyl stearate, octyl stearate, ethylhexyl stearate, dodecyl stearate, myristyl stearate, cetyl stearate, Examples include alkyl stearates such as hexyldecyl stearate, octyldodecyl stearate, decyl isostearate, and methylheptyl isostearate; and alkyl oleates such as methyl oleate, ethyl oleate, propyl oleate, isopropyl oleate, butyl oleate, hexyl oleate, octyl oleate, ethylhexyl oleate, dodecyl oleate, myristyl oleate, cetyl oleate, hexyldecyl oleate, and octyldodecyl oleate.From the viewpoint of easily achieving excellent combability, the fatty acid alkyl may include at least one selected from the group consisting of alkyl laurate, alkyl myristate, alkyl palmitate, alkyl stearate, and alkyl oleate, may include at least one selected from the group consisting of alkyl myristate and alkyl oleate, and may include at least one selected from the group consisting of isopropyl myristate and octyl oleate.

[0035] As the aliphatic saturated hydrocarbon of the second oil component, liquid paraffin or the like can be used.

[0036] The first oil component may include an oil (triglyceride) having an iodine value in the following ranges: The second oil component may include an oil (fatty acid alkyl and / or aliphatic saturated hydrocarbon) having an iodine value in the following ranges: The iodine value may be 200 or less, 190 or less, 180 or less, 170 or less, less than 170, 165 or less, 160 or less, 150 or less, 140 or less, 130 or less, 120 or less, 100 or less, 90 or less, 80 or less, 70 or less, 50 or less, 30 or less, 20 or less, 15 or less, 11 or less, 10 or less, 7 or less, 5 or less, or 4 or less. From the viewpoint of easily obtaining excellent combability, the iodine value may be greater than 0, 0.1 or greater, 4 or greater, 5 or greater, 7 or greater, 10 or greater, 11 or greater, 15 or greater, 20 or greater, 30 or greater, 50 or greater, 70 or greater, 80 or greater, 90 or greater, 100 or greater, 120 or greater, 130 or greater, 140 or greater, 150 or greater, 160 or greater, 165 or greater, or 170 or greater. From these viewpoints, the iodine value may be greater than 0 and 200 or less, 5 to 200, 70 to 200, 100 to 200, greater than 0 and 165 or less, 5 to 165, 70 to 165, 100 to 165, greater than 0 and 100 or less, 5 to 100, 70 to 100, greater than 0 and 70 or less, 5 to 70, or greater than 0 and 5 or less. The iodine value can be measured in accordance with the Quasi-drug Raw Materials Standards 2021 (Quasi-drug Standards 2021).

[0037] A nonionic surfactant is a surfactant that does not have a group that dissociates into ions in water. Nonionic surfactant A has a carbon chain having 10 to 22 carbon atoms (hereinafter referred to as "carbon chain A"). When the carbon chain A has 10 to 22 or more carbon atoms, excellent combing properties can be obtained. The carbon chain having 10 to 22 carbon atoms is a molecular chain formed by consecutively bonding 10 to 22 carbon atoms. The carbon chain may be linear, branched, or cyclic. The carbon chain may or may not have an unsaturated bond.

[0038] The number of carbon atoms in the carbon chain A may be 12 or more, 14 or more, 16 or more, or 18 or more, from the viewpoint of easily achieving excellent combing ease. The number of carbon atoms in the carbon chain A may be 20 or more. From the viewpoint of easily achieving excellent combing ease or slipperiness, the number of carbon atoms in the carbon chain A may be 20 or less or 18 or less. From the viewpoint of easily achieving excellent slipperiness, the number of carbon atoms in the carbon chain A may be 16 or less, 14 or less, or 12 or less. From these viewpoints, the number of carbon atoms in the carbon chain A may be 10 to 20, 10 to 18, 10 to 16, 10 to 12, 12 to 22, 12 to 20, 12 to 18, 16 to 22, 16 to 20, 16 to 18, 18 to 22, 18 to 20, or 20 to 22.

[0039] From the viewpoint of easily achieving excellent combing properties or slipperiness, the nonionic surfactant A may contain an ether compound having an ether bond connecting a hydrophobic moiety containing a carbon chain (carbon chain A) having 10 to 22 carbon atoms to a hydrophilic moiety. Examples of the hydrophobic moiety include hydrocarbon groups such as alkyl groups. The hydrocarbon group (alkyl group, etc.) may be linear, branched, or cyclic. The hydrophilic moiety may be a group having a hydrophilic group or a hydrophilic group. Examples of the hydrophilic group include a (poly)oxyalkylene group, a hydroxy group, a carboxy group, a carboxylate group, a phosphate group, a sulfonate group, and a sulfonate group. Examples of the (poly)oxyalkylene group include a (poly)oxyethylene group and a (poly)oxypropylene group.

[0040] From the viewpoint of easily achieving excellent combing properties or slipperiness, the nonionic surfactant A may contain a polyoxyalkylene alkyl ether, and may contain at least one selected from the group consisting of polyoxyethylene decyl ether, polyoxyethylene oleyl ether, polyoxyethylene stearyl ether, and polyoxyethylene behenyl ether.

[0041] The HLB value of the nonionic surfactant A is 6.0 to 14.0. In the hair fiber and fiber treatment agent according to this embodiment, at least one nonionic surfactant A having an HLB value of 6.0 to 14.0 is present. When the nonionic surfactant A has an HLB value of 6.0 to 14.0, excellent combing properties can be obtained. In the hair fiber and fiber treatment agent according to this embodiment, multiple nonionic surfactants A with different HLB values ​​may be present.

[0042] From the viewpoint of easily obtaining excellent combability or antistatic properties, the HLB value of the nonionic surfactant A may be 6.5 or more, 7.0 or more, 7.5 or more, 7.9 or more, 8.0 or more, 8.5 or more, 9.0 or more, 9.2 or more, 9.4 or more, 9.5 or more, 9.7 or more, 10.0 or more, 10.5 or more, or 10.8 or more. From the viewpoint of easily obtaining excellent antistatic properties, the HLB value of the nonionic surfactant A may be 11.0 or more, 11.5 or more, 12.0 or more, 12.5 or more, 13.0 or more, 13.5 or more, or 13.6 or more. From the viewpoint of easily obtaining excellent combability, the HLB value of the nonionic surfactant A may be 13.6 or less, 13.5 or less, 13.0 or less, 12.5 or less, 12.0 or less, 11.5 or less, 11.0 or less, or 10.8 or less. The HLB value of the nonionic surfactant A may be 10.5 or less, 10.0 or less, 9.7 or less, 9.5 or less, 9.4 or less, 9.2 or less, 9.0 or less, 8.5 or less, 8.0 or less, or 7.9 or less. From these viewpoints, the HLB value of the nonionic surfactant A may be 6.0 to 13.0, 6.0 to 11.0, 6.0 to 10.0, 8.0 to 14.0, 8.0 to 13.0, 8.0 to 11.0, 8.0 to 10.0, 10.0 to 14.0, 10.0 to 13.0, 10.0 to 11.0, or 11.0 to 14.0.

[0043] The HLB value of nonionic surfactant A can be calculated based on the Griffin method using the formula weight of the hydrophilic moiety and the molecular weight of nonionic surfactant A. For example, the HLB value can be calculated based on the Griffin method after extracting the nonionic surfactant A to be measured, measuring the molecular weight by GPC, identifying the structure by NMR, etc. The HLB value of nonionic surfactant A can be adjusted, for example, by the length of the hydrophilic moiety (e.g., a (poly)oxyalkylene group).

[0044] The hair fiber according to this embodiment may have a cationic surfactant present on at least a portion of the surface of the base fiber. The fiber treatment agent according to this embodiment may contain a cationic surfactant. By using a cationic surfactant, excellent combability or antistatic properties can be easily achieved.

[0045] Cationic surfactants are surfactants having cationic hydrophilic groups, i.e., surfactants having hydrophilic groups that dissociate into ions in water to become cations. Examples of cationic surfactants include quaternary ammonium salts, amine salts, pyridium salts, and imidazolinium salts. Examples of salts include phosphate salts and halide salts. Examples of halide salts include chloride salts, bromide salts, and iodide salts.

[0046] Examples of the quaternary ammonium salts include aliphatic quaternary ammonium salts, aromatic quaternary ammonium salts (excluding compounds that fall under the category of heterocyclic quaternary ammonium salts), heterocyclic quaternary ammonium salts, etc. Examples of the amine salts include aliphatic amine salts, such as monoalkylamine salts, dialkylamine salts, and trialkylamine salts.

[0047] The cationic surfactant may contain a quaternary ammonium salt, or may contain a quaternary ammonium salt that is a phosphate (a quaternary ammonium salt having a phosphate ion as a counter anion), from the viewpoint of easily achieving excellent combability or antistatic properties.

[0048] From the viewpoint of easily achieving excellent combability or antistatic properties, the cationic surfactant may include a compound having a cation having a structure represented by the following general formula (X), or may include a quaternary ammonium salt having a cation having a structure represented by the following general formula (X):

[0049] [ka] [In the formula, R x1 , R x2 , R x3 and R x4 each independently represents a monovalent group.

[0050] R x1 , R x2 , R x3 and R x4 Examples of the monovalent group include a hydrogen atom and a group containing a carbon atom (which may contain atoms other than carbon atoms). x1 , R x2 , R x3 and R x4 may each independently be a group containing carbon atoms.

[0051] Examples of the group containing carbon atoms include an alkyl group, an aryl group, a carboxy group, a carboxylate group, and an alkoxy group. The alkyl group may be unsubstituted or substituted. From the viewpoint of easily obtaining excellent combability or antistatic properties, R x1 , R x2 , R x3 and R x4 At least one selected from the group consisting of may be an alkyl group substituted with an alkylene oxide group (such as an ethylene oxide group or a propylene oxide group), a hydroxy group, a carboxy group, a halogeno group, or the like, and R x1 , R x2 , R x3 and R x4 At least two selected from the group consisting of may be alkyl groups substituted with an alkylene oxide group (such as an ethylene oxide group or a propylene oxide group), a hydroxy group, a carboxy group, a halogeno group, or the like.

[0052] From the viewpoint of easily obtaining excellent combability or antistatic properties, the compound having a cation of the structure represented by general formula (X) is x1 , R x2 , R x3 and R x4 The at least one selected from the group consisting of may have an alkyl group having 1 to 5 carbon atoms, may have an alkyl group having 18 to 22 carbon atoms, or may have an alkyl group having 1 to 5 carbon atoms and an alkyl group having 18 to 22 carbon atoms. From the viewpoint of easily achieving excellent combing ease or antistatic properties, the number of carbon atoms in the alkyl group having 1 to 5 carbon atoms may be 1 to 4, 1 to 3, or 1 to 2. From the viewpoint of easily achieving excellent combing ease or antistatic properties, the number of carbon atoms in the alkyl group having 18 to 22 carbon atoms may be 18 to 21, 18 to 20, 18 to 19, 19 to 22, 19 to 21, or 19 to 20.

[0053] The cationic surfactant may contain a quaternary ammonium salt having a cation with a structure represented by the following general formula (Y), from the viewpoint of easily achieving excellent combability or antistatic properties.

[0054] [ka] [In the formula, R y1 and R y2 each independently represents an alkyl group; Y 1 , Y 2 , Y 3 and Y 4 each independently represents an alkylene group, and m and n each independently represent an integer of 1 or more.

[0055] R y1 and R y2 The alkyl group in the formula (Y) may be unsubstituted or may be substituted with a hydroxy group, a halogeno group, or the like. From the viewpoint of easily obtaining excellent combability or antistatic properties, the quaternary ammonium salt having a cation of the formula (Y) is preferably a quaternary ammonium salt having a cation of the formula (Y) in the formula (Y). y1 and R y2The at least one selected from the group consisting of may have an alkyl group having 1 to 5 carbon atoms, may have an alkyl group having 18 to 22 carbon atoms, or may have an alkyl group having 1 to 5 carbon atoms and an alkyl group having 18 to 22 carbon atoms. From the viewpoint of easily achieving excellent combing ease or antistatic properties, the number of carbon atoms in the alkyl group having 1 to 5 carbon atoms may be 1 to 4, 1 to 3, or 1 to 2. From the viewpoint of easily achieving excellent combing ease or antistatic properties, the number of carbon atoms in the alkyl group having 18 to 22 carbon atoms may be 18 to 21, 18 to 20, 18 to 19, 19 to 22, 19 to 21, or 19 to 20.

[0056] Y 1 , Y 2 , Y 3 and Y 4 From the viewpoint of easily achieving excellent combing ease or antistatic properties, the number of carbon atoms of at least one alkylene group selected from the group consisting of may be 1 to 4, 1 to 3, 1 to 2, 2 to 4, or 2 to 3. From the viewpoint of easily achieving excellent combing ease or antistatic properties, the number of carbon atoms of at least one selected from the group consisting of m and n may be 1 to 15, or 2 to 15.

[0057] In the fiber for hair according to this embodiment, the content of the first oil component exceeds 0% by mass based on the total amount of the fiber for hair, and may be in the following ranges: From the viewpoint of easily achieving excellent combability or slipperiness, the content of the first oil component may be 0.0001% by mass or more, 0.0005% by mass or more, 0.001% by mass or more, 0.002% by mass or more, 0.003% by mass or more, 0.004% by mass or more, 0.005% by mass or more, 0.01% by mass or more, 0.03% by mass or more, 0.05% by mass or more, 0.06% by mass or more, 0.07% by mass or more, 0.1% by mass or more, 0.12% by mass or more, 0.15% by mass or more, 0.17% by mass or more, 0.175% by mass or more, 0.18% by mass or more, 0.2% by mass or more, 0.3% by mass or more, 0.4% by mass or more, or 0.5% by mass or more. From the viewpoint of easily obtaining excellent stickiness resistance, the content of the first oil component may be 5% by mass or less, 3% by mass or less, 1% by mass or less, 0.8% by mass or less, 0.5% by mass or less, 0.4% by mass or less, 0.3% by mass or less, 0.2% by mass or less, 0.18% by mass or less, 0.175% by mass or less, 0.17% by mass or less, 0.15% by mass or less, 0.12% by mass or less, 0.1% by mass or less, 0.07% by mass or less, 0.06% by mass or less, 0.05% by mass or less, 0.03% by mass or less, 0.01% by mass or less, 0.005% by mass or less, 0.004% by mass or less, 0.003% by mass or less, or 0.002% by mass or less. From these viewpoints, the content of the first oil component may be more than 0% by mass and not more than 5% by mass, more than 0% by mass and not more than 1% by mass, more than 0% by mass and not more than 0.2% by mass, more than 0% by mass and not more than 0.1% by mass, 0.01 to 5% by mass, 0.01 to 1% by mass, 0.01 to 0.2% by mass, 0.01 to 0.1% by mass, 0.05 to 5% by mass, 0.05 to 1% by mass, 0.05 to 0.2% by mass, or 0.05 to 0.1% by mass.

[0058] In the hair fiber according to this embodiment, the content C1 of the second oil (total amount of fatty acid alkyl and aliphatic saturated hydrocarbon: the same applies below), the content of fatty acid alkyl, or the content of aliphatic saturated hydrocarbon may be in the following range based on the total amount of the hair fiber. From the viewpoint of easily obtaining excellent combing ease, slipperiness, or antistatic properties, the content C1 may be more than 0% by mass, 0.0001% by mass or more, 0.0005% by mass or more, 0.001% by mass or more, 0.002% by mass or more, 0.003% by mass or more, 0.004% by mass or more, 0.005% by mass or more, 0.01% by mass or more, 0.03% by mass or more, 0.05% by mass or more, 0.06% by mass or more, 0.07% by mass or more, 0.1% by mass or more, 0.12% by mass or more, 0.15% by mass or more, 0.17% by mass or more, 0.175% by mass or more, 0.18% by mass or more, 0.2% by mass or more, 0.3% by mass or more, 0.4% by mass or more, or 0.5% by mass or more. From the viewpoint of easily obtaining excellent stickiness resistance, the content C1 is 5% by mass or less, 3% by mass or less, 1% by mass or less, 0.8% by mass or less, 0.5% by mass or less, 0.4% by mass or less, 0.3% by mass or less, 0.2% by mass or less, 0.18% by mass or less, 0.175% by mass or less, 0.17% by mass or less, 0.15 It may be less than or equal to 0.12 mass%, 0.1 mass% or less, 0.07 mass% or less, 0.06 mass% or less, 0.05 mass% or less, 0.03 mass% or less, 0.01 mass% or less, 0.005 mass% or less, 0.004 mass% or less, 0.003 mass% or less, or 0.002 mass% or less. From these viewpoints, the content C1 may be more than 0% by mass and not more than 5% by mass, more than 0% by mass and not more than 1% by mass, more than 0% by mass and not more than 0.2% by mass, more than 0% by mass and not more than 0.1% by mass, 0.01 to 5% by mass, 0.01 to 1% by mass, 0.01 to 0.2% by mass, 0.01 to 0.1% by mass, 0.05 to 5% by mass, 0.05 to 1% by mass, 0.05 to 0.2% by mass, or 0.05 to 0.1% by mass.

[0059] In the hair fiber according to this embodiment, the content of nonionic surfactant A exceeds 0% by mass, based on the total amount of the hair fiber, and may be in the following ranges: The content of nonionic surfactant A may be 0.0001% by mass or more, 0.0005% by mass or more, 0.001% by mass or more, 0.002% by mass or more, 0.003% by mass or more, 0.004% by mass or more, 0.005% by mass or more, 0.01% by mass or more, 0.03% by mass or more, 0.04% by mass or more, 0.05% by mass or more, 0.08% by mass or more, 0.1% by mass or more, 0.12% by mass or more, 0.14% by mass or more, 0.15% by mass or more, 0.16% by mass or more, 0.2% by mass or more, or 0.3% by mass or more. From the viewpoint of easily achieving excellent combability or slipperiness, the content of nonionic surfactant A may be 5% by mass or less, 4% by mass or less, 3% by mass or less, 2% by mass or less, 1% by mass or less, 0.8% by mass or less, 0.5% by mass or less, 0.4% by mass or less, 0.3% by mass or less, 0.2% by mass or less, 0.16% by mass or less, 0.15% by mass or less, 0.14% by mass or less, 0.12% by mass or less, 0.1% by mass or less, 0.08% by mass or less, 0.05% by mass or less, 0.04% by mass or less, 0.03% by mass or less, 0.01% by mass or less, 0.005% by mass or less, 0.004% by mass or less, 0.003% by mass or less, or 0.002% by mass or less. From these viewpoints, the content of nonionic surfactant A may be more than 0% by mass and not more than 5% by mass, more than 0% by mass and not more than 1% by mass, more than 0% by mass and not more than 0.5% by mass, more than 0% by mass and not more than 0.1% by mass, 0.001 to 5% by mass, 0.001 to 1% by mass, 0.001 to 0.5% by mass, 0.001 to 0.1% by mass, 0.01 to 5% by mass, 0.01 to 1% by mass, 0.01 to 0.5% by mass, or 0.01 to 0.1% by mass.

[0060] In the hair fiber according to this embodiment, the content of the cationic surfactant may be in the following ranges based on the total amount of the hair fiber, from the viewpoint of easily achieving excellent combability or antistatic properties. The content of the cationic surfactant may be more than 0% by mass, 0.0001% by mass or more, 0.0005% by mass or more, 0.001% by mass or more, 0.005% by mass or more, 0.008% by mass or more, 0.01% by mass or more, 0.012% by mass or more, 0.015% by mass or more, 0.018% by mass or more, or 0.02% by mass or more. The content of the cationic surfactant may be 1% by mass or less, 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, 0.08% by mass or less, 0.05% by mass or less, 0.04% by mass or less, or 0.03% by mass or less. From these viewpoints, the content of the cationic surfactant may be more than 0% by mass and not more than 1% by mass, more than 0% by mass and not more than 0.1% by mass, more than 0% by mass and not more than 0.05% by mass, more than 0% by mass and not more than 0.03% by mass, 0.001 to 1% by mass, 0.001 to 0.1% by mass, 0.001 to 0.05% by mass, 0.001 to 0.03% by mass, 0.01 to 1% by mass, 0.01 to 0.1% by mass, 0.01 to 0.05% by mass, or 0.01 to 0.03% by mass.

[0061] The contents of the first oil component, the second oil component, the nonionic surfactant A, and the cationic surfactant can be measured using NMR, GC-MS, HPLC, FT-IR, hot water extraction, solvent extraction, etc. The relative amounts of the first oil component, the second oil component, the nonionic surfactant A, and the cationic surfactant in hair fibers tend to be similar to the relative amounts in the fiber treatment agent.

[0062] In the hair fiber and fiber treatment agent according to this embodiment, the content of the first oil component may be in the following range per 100 parts by mass of the second oil component, fatty acid alkyl, or aliphatic saturated hydrocarbon, from the viewpoint of easily achieving excellent combing properties, slipperiness, or stickiness resistance. The content of the first oil component may be 0.1 parts by mass or more, 0.5 parts by mass or more, 1 part by mass or more, 3 parts by mass or more, 5 parts by mass or more, 7 parts by mass or more, 10 parts by mass or more, 30 parts by mass or more, 50 parts by mass or more, 80 parts by mass or more, 100 parts by mass or more, 120 parts by mass or more, 150 parts by mass or more, 200 parts by mass or more, 500 parts by mass or more, 800 parts by mass or more, 1000 parts by mass or more, 1500 parts by mass or more, 2000 parts by mass or more, 2300 parts by mass or more, 2500 parts by mass or more, 3000 parts by mass or more, 3500 parts by mass or more, 4000 parts by mass or more, or 4500 parts by mass or more. The content of the first oil component is 5000 parts by mass or less, 4500 parts by mass or less, 4000 parts by mass or less, 3500 parts by mass or less, 3000 parts by mass or less, 2500 parts by mass or less, 2300 parts by mass or less, 2000 parts by mass or less, 1500 parts by mass or less, 1000 parts by mass or less, 80 parts by mass or less It may be 0 parts by mass or less, 500 parts by mass or less, 200 parts by mass or less, 150 parts by mass or less, 120 parts by mass or less, 100 parts by mass or less, 80 parts by mass or less, 50 parts by mass or less, 30 parts by mass or less, 10 parts by mass or less, 7 parts by mass or less, 5 parts by mass or less, or 3 parts by mass or less. From these viewpoints, the content of the first oil component may be 0.1 to 5000 parts by mass, 0.1 to 3000 parts by mass, 0.1 to 500 parts by mass, 0.1 to 200 parts by mass, 1 to 5000 parts by mass, 1 to 3000 parts by mass, 1 to 500 parts by mass, 1 to 200 parts by mass, 10 to 5000 parts by mass, 10 to 3000 parts by mass, 10 to 500 parts by mass, or 10 to 200 parts by mass.

[0063] In the hair fiber and fiber treatment agent according to this embodiment, the content of the first oil component may be in the following range relative to 100 parts by mass of the nonionic surfactant A. From the viewpoint of easily obtaining excellent combing or slipperiness, the content of the first oil component may be 0.1 parts by mass or more, 0.5 parts by mass or more, 1 part by mass or more, 3 parts by mass or more, 4 parts by mass or more, 5 parts by mass or more, 7 parts by mass or more, 10 parts by mass or more, 12 parts by mass or more, 15 parts by mass or more, 20 parts by mass or more, 30 parts by mass or more, 50 parts by mass or more, 80 parts by mass or more, 100 parts by mass or more, 120 parts by mass or more, 150 parts by mass or more, 180 parts by mass or more, 200 parts by mass or more, 500 parts by mass or more, 800 parts by mass or more, 1000 parts by mass or more, 1500 parts by mass or more, 2000 parts by mass or more, 2300 parts by mass or more, 2500 parts by mass or more, 3000 parts by mass or more, 3500 parts by mass or more, 4000 parts by mass or more, or 4500 parts by mass or more. The content of the first oil component is, from the viewpoint of easily obtaining excellent stickiness resistance, 5000 parts by mass or less, 4500 parts by mass or less, 4000 parts by mass or less, 3500 parts by mass or less, 3000 parts by mass or less, 2500 parts by mass or less, 2300 parts by mass or less, 2000 parts by mass or less, 1500 parts by mass or less, 1000 parts by mass or less, 800 parts by mass or less, It may be 500 parts by mass or less, 200 parts by mass or less, 180 parts by mass or less, 150 parts by mass or less, 120 parts by mass or less, 100 parts by mass or less, 80 parts by mass or less, 50 parts by mass or less, 30 parts by mass or less, 20 parts by mass or less, 15 parts by mass or less, 12 parts by mass or less, 10 parts by mass or less, 7 parts by mass or less, 5 parts by mass or less, or 4 parts by mass or less. From these viewpoints, the content of the first oil component may be 0.1 to 5000 parts by mass, 0.1 to 3000 parts by mass, 0.1 to 500 parts by mass, 0.1 to 200 parts by mass, 1 to 5000 parts by mass, 1 to 3000 parts by mass, 1 to 500 parts by mass, 1 to 200 parts by mass, 10 to 5000 parts by mass, 10 to 3000 parts by mass, 10 to 500 parts by mass, or 10 to 200 parts by mass.

[0064] In the hair fiber and fiber treatment agent according to this embodiment, the content C2 of the second oil, the content of the fatty acid alkyl, or the content of the aliphatic saturated hydrocarbon may be in the following range relative to 100 parts by mass of nonionic surfactant A. From the viewpoint of easily achieving excellent combability or slipperiness, the content C2 may be 0.1 parts by mass or more, 0.5 parts by mass or more, 1 part by mass or more, 3 parts by mass or more, 4 parts by mass or more, 5 parts by mass or more, 7 parts by mass or more, 10 parts by mass or more, 12 parts by mass or more, 15 parts by mass or more, 20 parts by mass or more, 30 parts by mass or more, 50 parts by mass or more, 80 parts by mass or more, 100 parts by mass or more, 120 parts by mass or more, 150 parts by mass or more, 180 parts by mass or more, 200 parts by mass or more, 500 parts by mass or more, 800 parts by mass or more, 1000 parts by mass or more, 1500 parts by mass or more, 2000 parts by mass or more, 2300 parts by mass or more, 2500 parts by mass or more, 3000 parts by mass or more, 3500 parts by mass or more, 4000 parts by mass or more, or 4500 parts by mass or more. The content C2 is 5000 parts by mass or less, 4500 parts by mass or less, 4000 parts by mass or less, 3500 parts by mass or less, 3000 parts by mass or less, 2500 parts by mass or less, 2300 parts by mass or less, 2000 parts by mass or less, 1500 parts by mass or less, 1000 parts by mass or less, 800 parts by mass or less, 50 parts by mass or less. It may be 0 parts by mass or less, 200 parts by mass or less, 180 parts by mass or less, 150 parts by mass or less, 120 parts by mass or less, 100 parts by mass or less, 80 parts by mass or less, 50 parts by mass or less, 30 parts by mass or less, 20 parts by mass or less, 15 parts by mass or less, 12 parts by mass or less, 10 parts by mass or less, 7 parts by mass or less, 5 parts by mass or less, or 4 parts by mass or less. From these viewpoints, the content C2 may be 0.1 to 5000 parts by mass, 0.1 to 3000 parts by mass, 0.1 to 500 parts by mass, 0.1 to 200 parts by mass, 1 to 5000 parts by mass, 1 to 3000 parts by mass, 1 to 500 parts by mass, 1 to 200 parts by mass, 10 to 5000 parts by mass, 10 to 3000 parts by mass, 10 to 500 parts by mass, or 10 to 200 parts by mass.

[0065] In the hair fiber and fiber treatment agent according to this embodiment, the content of the cationic surfactant per 100 parts by mass of the first oil may be in the following ranges: From the viewpoint of easily obtaining excellent stickiness resistance, the content of the cationic surfactant may be 0.1 parts by mass or more, 0.5 parts by mass or more, 1 part by mass or more, 1.5 parts by mass or more, 2 parts by mass or more, 2.5 parts by mass or more, 3 parts by mass or more, 5 parts by mass or more, 10 parts by mass or more, 30 parts by mass or more, 50 parts by mass or more, 100 parts by mass or more, 200 parts by mass or more, 300 parts by mass or more, 500 parts by mass or more, 600 parts by mass or more, 700 parts by mass or more, 800 parts by mass or more, 1000 parts by mass or more, or 1200 parts by mass or more. From the viewpoint of easily achieving excellent combing ease or slipperiness, the content of the cationic surfactant may be 3000 parts by mass or less, 2500 parts by mass or less, 2000 parts by mass or less, 1500 parts by mass or less, 1200 parts by mass or less, 1000 parts by mass or less, 800 parts by mass or less, 700 parts by mass or less, 600 parts by mass or less, 500 parts by mass or less, 300 parts by mass or less, 200 parts by mass or less, 100 parts by mass or less, 50 parts by mass or less, 30 parts by mass or less, 10 parts by mass or less, 5 parts by mass or less, 3 parts by mass or less, 2.5 parts by mass or less, or 2 parts by mass or less. From these viewpoints, the content of the cationic surfactant may be 0.1 to 3000 parts by mass, 0.1 to 1500 parts by mass, 0.1 to 800 parts by mass, 0.1 to 100 parts by mass, 2 to 3000 parts by mass, 2 to 1500 parts by mass, 2 to 800 parts by mass, 2 to 100 parts by mass, 10 to 3000 parts by mass, 10 to 1500 parts by mass, 10 to 800 parts by mass, or 10 to 100 parts by mass.

[0066] In the hair fiber and fiber treatment agent according to this embodiment, the content of the cationic surfactant per 100 parts by mass of the second oil, fatty acid alkyl, or aliphatic saturated hydrocarbon may be in the following ranges: From the viewpoint of easily achieving excellent stickiness resistance, the content of the cationic surfactant may be 0.1 parts by mass or more, 0.5 parts by mass or more, 1 part by mass or more, 1.5 parts by mass or more, 2 parts by mass or more, 2.5 parts by mass or more, 3 parts by mass or more, 5 parts by mass or more, 10 parts by mass or more, 30 parts by mass or more, 50 parts by mass or more, 100 parts by mass or more, 200 parts by mass or more, 300 parts by mass or more, 500 parts by mass or more, 600 parts by mass or more, 700 parts by mass or more, 800 parts by mass or more, 1000 parts by mass or more, or 1200 parts by mass or more. From the viewpoint of easily achieving excellent combing properties, slip resistance, or antistatic properties, the content of the cationic surfactant may be 3000 parts by mass or less, 2500 parts by mass or less, 2000 parts by mass or less, 1500 parts by mass or less, 1200 parts by mass or less, 1000 parts by mass or less, 800 parts by mass or less, 700 parts by mass or less, 600 parts by mass or less, 500 parts by mass or less, 300 parts by mass or less, 200 parts by mass or less, 100 parts by mass or less, 50 parts by mass or less, 30 parts by mass or less, 10 parts by mass or less, 5 parts by mass or less, 3 parts by mass or less, 2.5 parts by mass or less, or 2 parts by mass or less. From these viewpoints, the content of the cationic surfactant may be 0.1 to 3000 parts by mass, 0.1 to 1500 parts by mass, 0.1 to 800 parts by mass, 0.1 to 100 parts by mass, 2 to 3000 parts by mass, 2 to 1500 parts by mass, 2 to 800 parts by mass, 2 to 100 parts by mass, 10 to 3000 parts by mass, 10 to 1500 parts by mass, 10 to 800 parts by mass, or 10 to 100 parts by mass.

[0067] In the hair fiber and fiber treatment agent according to this embodiment, the content of the cationic surfactant may be in the following ranges relative to 100 parts by mass of the nonionic surfactant A. From the viewpoint of easily achieving excellent combing ease or slipperiness, the content of the cationic surfactant may be 0.1 parts by mass or more, 0.5 parts by mass or more, 1 part by mass or more, 2 parts by mass or more, 3 parts by mass or more, 4 parts by mass or more, 5 parts by mass or more, 10 parts by mass or more, 30 parts by mass or more, or 40 parts by mass or more. From the viewpoint of easily achieving excellent combing ease or slipperiness, the content of the cationic surfactant may be 50 parts by mass or more, 100 parts by mass or more, 300 parts by mass or more, 500 parts by mass or more, 600 parts by mass or more, 700 parts by mass or more, 800 parts by mass or more, 1000 parts by mass or more, or 1200 parts by mass or more. From the viewpoint of easily achieving excellent combability, the content of the cationic surfactant may be 3,000 parts by mass or less, 2,500 parts by mass or less, 2,000 parts by mass or less, 1,500 parts by mass or less, 1,200 parts by mass or less, 1,000 parts by mass or less, 800 parts by mass or less, 700 parts by mass or less, 600 parts by mass or less, 500 parts by mass or less, 300 parts by mass or less, 100 parts by mass or less, or 50 parts by mass or less. The content of the cationic surfactant may be 40 parts by mass or less, 30 parts by mass or less, 10 parts by mass or less, 5 parts by mass or less, or 4 parts by mass or less. From these viewpoints, the content of the cationic surfactant may be 0.1 to 3000 parts by mass, 0.1 to 1500 parts by mass, 0.1 to 800 parts by mass, 0.1 to 100 parts by mass, 3 to 3000 parts by mass, 3 to 1500 parts by mass, 3 to 800 parts by mass, 3 to 100 parts by mass, 10 to 3000 parts by mass, 10 to 1500 parts by mass, 10 to 800 parts by mass, or 10 to 100 parts by mass.

[0068] In the hair fiber according to this embodiment, the total amount T1 of the first oil component, the second oil component, and the nonionic surfactant A is 0.01 to 1.6% by mass based on the total amount of the hair fiber. When the total amount T1 is 0.01% by mass or more, excellent slip resistance can be obtained. When the total amount T1 is 1.6% by mass or less, excellent combability can be obtained.

[0069] From the viewpoint of easily obtaining excellent combability or antistatic properties, the total amount T1 may be 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, 0.15% by mass or more, 0.2% by mass or more, 0.25% by mass or more, 0.3% by mass or more, 0.5% by mass or more, 0.8% by mass or more, 1% by mass or more, or 1.2% by mass or more. From the viewpoint of easily obtaining excellent slip resistance or stickiness resistance, the total amount T1 may be 1.5% by mass or less, 1.4% by mass or less, 1.2% by mass or less, 1% by mass or less, 0.8% by mass or less, 0.5% by mass or less, 0.3% by mass or less, 0.25% by mass or less, 0.2% by mass or less, 0.15% by mass or less, 0.1% by mass or less, 0.08% by mass or less, 0.05% by mass or less, or 0.03% by mass or less. From these viewpoints, the total amount T1 may be 0.01 to 1 mass%, 0.01 to 0.5 mass%, 0.01 to 0.3 mass%, 0.05 to 1.6 mass%, 0.05 to 1 mass%, 0.05 to 0.5 mass%, 0.05 to 0.3 mass%, 0.1 to 1.6 mass%, 0.1 to 1 mass%, 0.1 to 0.5 mass%, or 0.1 to 0.3 mass%.

[0070] In the hair fiber and fiber treatment agent according to this embodiment, the content of the first oil component exceeds 0% by mass and may be in the following ranges, based on the total amount T1 of the first oil component, the second oil component, and the nonionic surfactant A. From the viewpoint of easily achieving excellent combing ease or slipperiness, the content of the first oil component may be 0.1% by mass or more, 0.5% by mass or more, 1% by mass or more, 2% by mass or more, 3% by mass or more, 5% by mass or more, 10% by mass or more, 20% by mass or more, 30% by mass or more, 40% 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 or more. From the viewpoint of easily obtaining excellent stickiness resistance, the content of the first oil component may be less than 100% by mass, 95% by mass or less, 90% by mass or less, 80% by mass or less, 70% by mass or less, 60% by mass or less, 50% by mass or less, 40% by mass or less, 30% by mass or less, 20% by mass or less, 10% by mass or more but less than 100% by mass, more than 0% by mass or less than 90% by mass, 3 to 90% by mass, 10 to 90% by mass, more than 0% by mass or less than 50% by mass, 3 to 50% by mass, or 10 to 50% by mass.

[0071] In the hair fiber and fiber treatment agent according to this embodiment, the content C3 of the second oil component, the content of the fatty acid alkyl component, or the content of the aliphatic saturated hydrocarbon may be in the following ranges based on the total amount T1 of the first oil component, the second oil component, and the nonionic surfactant A. From the viewpoint of easily achieving excellent combing ease, slipperiness, or antistatic properties, the content C3 may be more than 0% by mass, 0.1% by mass or more, 0.5% by mass or more, 1% by mass or more, 2% by mass or more, 3% by mass or more, 5% by mass or more, 10% by mass or more, 20% by mass or more, 30% by mass or more, 40% 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 or more. From the viewpoint of easily obtaining excellent stickiness resistance, the content C3 may be less than 100% by mass, 95% by mass or less, 90% by mass or less, 80% by mass or less, 70% by mass or less, 60% by mass or less, 50% by mass or less, 40% by mass or less, 30% by mass or less, 20% by mass or less, 10% by mass or more but less than 100% by mass, more than 0% by mass or less than 90% by mass, 3 to 90% by mass, 10 to 90% by mass, more than 0% by mass or less than 50% by mass, 3 to 50% by mass, or 10 to 50% by mass.

[0072] In the hair fiber and fiber treatment agent according to this embodiment, the content of nonionic surfactant A exceeds 0% by mass and may be within the following ranges, based on the total amount T1 of the first oil component, the second oil component, and the nonionic surfactant A. The content of nonionic surfactant A may be 0.1% by mass or more, 0.5% by mass or more, 1% by mass or more, 2% by mass or more, 3% by mass or more, 5% by mass or more, 10% by mass or more, 20% by mass or more, 30% by mass or more, 40% by mass or more, 50% by mass or more, 60% by mass or more, 70% by mass or more, or 80% by mass or more. From the viewpoint of easily obtaining excellent combability or slipperiness, the content of the nonionic surfactant A may be less than 100% by mass, 90% by mass or less, 80% by mass or less, 70% by mass or less, 60% by mass or less, 50% by mass or less, 40% by mass or less, 30% by mass or less, 20% by mass or less, 10% by mass or more but less than 100% by mass, more than 0% by mass or less than 80% by mass, 2 to 80% by mass, 10 to 80% by mass, more than 0% by mass or less than 50% by mass, 2 to 50% by mass, or 10 to 50% by mass.

[0073] The contents of the first oil component, the second oil component, and the nonionic surfactant can be combined in any manner based on the total amount T1 of the first oil component, the second oil component, and the nonionic surfactant A. For example, the hair fiber and fiber treatment agent according to this embodiment may have an aspect in which the content of the first oil component is 3 to 90 mass %, the content of the second oil component is 3 to 90 mass %, and the content of the nonionic surfactant is 2 to 80 mass %, based on the total amount T1 of the first oil component, the second oil component, and the anionic surfactant A.

[0074] In the hair fiber according to this embodiment, the total amount T2 of the first oil component, the second oil component, the nonionic surfactant A, and the cationic surfactant may be in the following range based on the total amount of the hair fiber: From the viewpoint of easily achieving excellent combability or antistatic properties, the total amount T2 may be 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, 0.15% by mass or more, 0.2% by mass or more, 0.25% by mass or more, 0.3% by mass or more, 0.5% by mass or more, 0.8% by mass or more, 1% by mass or more, 1.2% by mass or more, or 1.4% by mass or more. From the viewpoint of easily achieving excellent combability or slipperiness, the total amount T2 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, 1% by mass or less, 0.8% by mass or less, 0.5% by mass or less, 0.3% by mass or less, 0.25% by mass or less, 0.2% by mass or less, 0.15% by mass or less, 0.1% by mass or less, 0.08% by mass or less, 0.05% by mass or less, or 0.03% by mass or less. From these viewpoints, the total amount T2 may be 0.02 to 1.6 mass%, 0.02 to 1 mass%, 0.02 to 0.5 mass%, 0.02 to 0.3 mass%, 0.05 to 1.6 mass%, 0.05 to 1 mass%, 0.05 to 0.5 mass%, 0.05 to 0.3 mass%, 0.1 to 1.6 mass%, 0.1 to 1 mass%, 0.1 to 0.5 mass%, or 0.1 to 0.3 mass%.

[0075] In the fiber treatment agent according to this embodiment, the total amount T3 of the first oil component, the second oil component, and the nonionic surfactant A may be within the following ranges based on the total amount of the fiber treatment agent, from the viewpoint of easily achieving excellent combability, slip resistance, stickiness resistance, or antistatic properties: The total amount T3 may be 0.1% by mass or more, 0.5% 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, 8% by mass or more, 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, or 40% by mass or more. The total amount T3 may be 50% by mass or less, 45% by mass or less, 40% 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, 10% by mass or less, 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 total amount T3 may be 0.1 to 50% by mass, 0.1 to 30% by mass, 0.1 to 10% by mass, 1 to 50% by mass, 1 to 30% by mass, 1 to 10% by mass, 5 to 50% by mass, 5 to 30% by mass, or 5 to 10% by mass.

[0076] In the fiber treatment agent according to this embodiment, the total amount T4 of the first oil component, the second oil component, the nonionic surfactant A, and the cationic surfactant may be within the following ranges based on the total amount of the fiber treatment agent, from the viewpoint of easily achieving excellent combing properties, slip resistance, stickiness resistance, or antistatic properties: The total amount T4 may be 0.1% by mass or more, 0.5% 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, 8% by mass or more, 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, or 40% by mass or more. The total amount T4 may be 50% by mass or less, 45% by mass or less, 40% 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, 10% by mass or less, 8% by mass or less, 6% by mass or less, or 5% by mass or less. From these viewpoints, the total amount T4 may be 0.1 to 50% by mass, 0.1 to 30% by mass, 0.1 to 10% by mass, 1 to 50% by mass, 1 to 30% by mass, 1 to 10% by mass, 5 to 50% by mass, 5 to 30% by mass, or 5 to 10% by mass.

[0077] In the fiber treatment agent according to this embodiment, the content of the first oil component exceeds 0% by mass, based on the total amount of the fiber treatment agent, and may be in the following ranges: From the viewpoint of easily achieving excellent combing ease or slipperiness, the content of the first oil component may be 0.001% by mass or more, 0.005% by mass or more, 0.01% 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, 0.5% by mass or more, 1% by mass or more, 1.5% by mass or more, 2% by mass or more, 2.5% by mass or more, 3% by mass or more, 5% by mass or more, 10% by mass or more, 20% by mass or more, 25% by mass or more, 30% by mass or more, 35% by mass or more, or 40% by mass or more. From the viewpoint of easily obtaining excellent stickiness resistance, the content of the first oil component may be 50% by mass or less, 45% by mass or less, 40% by mass or less, 35% by mass or less, 30% by mass or less, 25% by mass or less, 20% by mass or less, 10% by mass or less, 5% by mass or less, 3% by mass or less, 2.5% by mass or less, 2% by mass or less, 1.5% by mass or less, 1% by mass or less, 0.5% by mass or less, 0.1% by mass or less, 0.08% by mass or less, or 0.05% by mass or less. From these viewpoints, the content of the first oil component may be more than 0% by mass and not more than 50% by mass, more than 0% by mass and not more than 30% by mass, more than 0% by mass and not more than 10% by mass, more than 0% by mass and not more than 5% by mass, 0.1 to 50% by mass, 0.1 to 30% by mass, 0.1 to 10% by mass, 0.1 to 5% by mass, 1 to 50% by mass, 1 to 30% by mass, 1 to 10% by mass, or 1 to 5% by mass.

[0078] In the fiber treatment agent according to this embodiment, the content C4 of the second oil, the content of fatty acid alkyl, or the content of aliphatic saturated hydrocarbon may be in the following ranges based on the total amount of the fiber treatment agent: From the viewpoint of easily achieving excellent combing ease, slipperiness, or antistatic properties, the content C4 may be more than 0% by mass, 0.001% by mass or more, 0.005% by mass or more, 0.01% 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, 0.5% by mass or more, 1% by mass or more, 1.5% by mass or more, 2% by mass or more, 2.5% by mass or more, 3% by mass or more, 5% by mass or more, 10% by mass or more, 20% by mass or more, 25% by mass or more, 30% by mass or more, 35% by mass or more, or 40% by mass or more. From the viewpoint of easily obtaining excellent stickiness resistance, the content C4 may be 50% by mass or less, 45% by mass or less, 40% by mass or less, 35% by mass or less, 30% by mass or less, 25% by mass or less, 20% by mass or less, 10% by mass or less, 5% by mass or less, 3% by mass or less, 2.5% by mass or less, 2% by mass or less, 1.5% by mass or less, 1% by mass or less, 0.5% by mass or less, 0.1% by mass or less, 0.08% by mass or less, or 0.05% by mass or less. From these viewpoints, the content C4 may be more than 0% by mass and 50% by mass or less, more than 0% by mass and 30% by mass or less, more than 0% by mass and 10% by mass or less, more than 0% by mass and 5% by mass or less, 0.1 to 50% by mass, 0.1 to 30% by mass, 0.1 to 10% by mass, 0.1 to 5% by mass, 1 to 50% by mass, 1 to 30% by mass, 1 to 10% by mass, or 1 to 5% by mass.

[0079] In the fiber treatment agent according to this embodiment, the content of nonionic surfactant A, based on the total amount of the fiber treatment agent, exceeds 0% by mass and may be in the following ranges: The content of nonionic surfactant A may be 0.001% by mass or more, 0.005% by mass or more, 0.01% 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, 0.5% by mass or more, 1% by mass or more, or 1.5% by mass or more; The content of nonionic surfactant A may be 2% by mass or more, 2.5% by mass or more, 3% by mass or more, 5% by mass or more, 10% by mass or more, 15% by mass or more, or 20% by mass or more. From the viewpoint of easily achieving excellent combability or slipperiness, the content of the nonionic surfactant A may be 50% by mass or less, 45% by mass or less, 40% by mass or less, 35% by mass or less, 30% by mass or less, 25% by mass or less, 20% by mass or less, 10% by mass or less, 5% by mass or less, 3% by mass or less, 2.5% by mass or less, 2% by mass or less, or 1.5% by mass or less. From the viewpoint of easily achieving excellent combability or slipperiness, the content of the nonionic surfactant A may be 1% by mass or less, 0.5% by mass or less, 0.1% by mass or less, 0.08% by mass or less, or 0.05% by mass or less. From these viewpoints, the content of nonionic surfactant A may be more than 0% by mass and not more than 50% by mass, more than 0% by mass and not more than 30% by mass, more than 0% by mass and not more than 10% by mass, more than 0% by mass and not more than 5% by mass, 0.1 to 50% by mass, 0.1 to 30% by mass, 0.1 to 10% by mass, 0.1 to 5% by mass, 1 to 50% by mass, 1 to 30% by mass, 1 to 10% by mass, or 1 to 5% by mass.

[0080] In the fiber treatment agent according to this embodiment, the content of the cationic surfactant may be in the following ranges based on the total amount of the fiber treatment agent, from the viewpoint of easily achieving excellent combability or antistatic properties. The content of the cationic surfactant may be more than 0% by mass, 0.01% by mass or more, 0.05% by mass or more, 0.1% by mass or more, 0.3% by mass or more, 0.5% by mass or more, or 0.7% by mass or more. The content of the cationic surfactant may be 10% by mass or less, 5% by mass or less, 3% by mass or less, 2% by mass or less, 1.5% by mass or less, 1% by mass or less, 0.8% by mass or less, or 0.7% by mass or less. From these viewpoints, the content of the cationic surfactant may be more than 0% by mass and not more than 10% by mass, more than 0% by mass and not more than 5% by mass, more than 0% by mass and not more than 3% by mass, more than 0% by mass and not more than 1% by mass, 0.1 to 10% by mass, 0.1 to 5% by mass, 0.1 to 3% by mass, 0.1 to 1% by mass, 0.5 to 10% by mass, 0.5 to 5% by mass, 0.5 to 3% by mass, or 0.5 to 1% by mass.

[0081] The fiber treatment agent according to this embodiment may contain water. In the fiber treatment agent according to this embodiment, the water content may be within the following ranges based on the total amount of the fiber treatment agent, from the viewpoint of easily achieving excellent combability, slipperiness, stickiness resistance, or antistatic properties. The water content may be 50% by mass or more, more than 50% by mass, 60% by mass or more, 65% by mass or more, 70% by mass or more, 75% by mass or more, 80% by mass or more, 85% by mass or more, 90% by mass or more, or 95% by mass or more. The water content may be 99% by mass or less, 96% by mass or less, 95% by mass or less, 90% by mass or less, 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 60% by mass or less. From these viewpoints, the water content may be 50 to 99 mass%, 70 to 99 mass%, 90 to 99 mass%, 50 to 97 mass%, 70 to 97 mass%, 90 to 97 mass%, 50 to 95 mass%, 70 to 95 mass%, or 90 to 95 mass%.

[0082] The hair fiber according to this embodiment may have other components (components other than the first oil component, the second oil component, nonionic surfactant A, and cationic surfactant) present on at least a portion of the surface of the base fiber, and the fiber treatment agent according to this embodiment may contain other components (components other than the first oil component, the second oil component, nonionic surfactant A, and cationic surfactant). Examples of such components include oils other than the first oil component and the second oil component (e.g., higher alcohols), nonionic surfactants other than nonionic surfactant A, antibacterial agents, deodorizing agents, antifungal agents, UV-blocking agents, fabric softeners, SR agents, fragrance agents, flame retardants, antifoaming agents, and fragrances. In the hair fiber 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 may not contain at least one selected from the group consisting of zeolite and zirconium carbide. In the hair fiber according to this embodiment, an alcohol consisting only of carbon, hydrogen, and oxygen atoms does not need to be present on the surface of the base fiber, and the fiber treatment agent according to this embodiment does not need to contain an alcohol consisting only of carbon, hydrogen, and oxygen atoms.

[0083] In the hair fiber and fiber treatment agent according to this embodiment, the total amount of the first oil and the second oil may be 50% by mass or more, more than 50% by mass, 70% by mass or more, 90% by mass or more, 95% by mass or more, 98% by mass or more, 99% by mass or more, or substantially 100% by mass, based on the total amount of oil present in the hair fiber or fiber treatment agent (the total amount of the first oil, the second oil, and oils not falling under the category of the first oil and the second oil).

[0084] In the hair fiber and fiber treatment agent according to this embodiment, the content of nonionic surfactant A may be 50% by mass or more, more than 50% by mass, 70% by mass or more, 90% by mass or more, 95% by mass or more, 98% by mass or more, 99% by mass or more, or substantially 100% by mass, based on the total amount of nonionic surfactants present in the hair fiber or fiber treatment agent (the total amount of nonionic surfactant A and nonionic surfactants not corresponding to nonionic surfactant A).

[0085] In the method for producing hair fibers according to this embodiment, the fiber treatment agent according to this embodiment is brought into contact with the surface of the base fiber. That is, the method for producing hair fibers according to this embodiment includes a fiber treatment step in which the fiber treatment agent according to this embodiment is brought into contact with the surface of the base fiber. In the fiber treatment step, the fiber treatment agent in a one-phase state can be brought into contact with the surface of the base fiber.

[0086] In the fiber treatment process, the fiber treatment agent can be applied to at least a portion of the surface of the base fiber. In this case, a conventionally known means for applying a liquid to a fiber can be used. Examples include a means for applying the fiber treatment agent to the base fiber using a roll having a surface on which the fiber treatment agent is attached (roll transfer method); a means for immersing the base fiber in a liquid tank containing the fiber treatment agent (dipping method); a means for spraying the fiber treatment agent onto the base fiber; and a means for applying the fiber treatment agent to the base fiber using an applicator such as a brush.

[0087] The method for producing hair fibers according to this embodiment may include a spinning step, prior to the fiber treatment step, in which a composition containing the material for the base fiber is spun to obtain the base fiber. In the spinning step, the composition containing the material for the base fiber can be melt spun (melt deformed).

[0088] The method for producing hair fibers according to this embodiment may include a kneading step of melt-kneading a composition containing the material for the base fiber before the spinning step. Various common kneaders can be used as the melt-kneading device. Examples of kneaders include single-screw extruders, twin-screw extruders, rolls, Banbury mixers, and kneaders.

[0089] The method for producing fiber for hair according to this embodiment may include a drawing step of drawing the yarn (undrawn yarn) obtained in the spinning step, prior to the fiber treatment step.

[0090] The draw ratio in the drawing step may be 1.5 times or more, or 2.0 times or more, from the viewpoint of facilitating fiber strength development. The draw ratio may be 5.0 times or less, or 4.0 times or less, from the viewpoint of preventing yarn breakage during drawing. From these viewpoints, the draw ratio may be 1.5 to 5.0 times, or 2.0 to 4.0 times.

[0091] The drawing treatment may be carried out by a two-step method in which the undrawn yarn is once wound onto a bobbin and then drawn in a step not subsequent to the spinning step, or by a direct spinning drawing method in which the undrawn yarn is drawn in a step subsequent to the spinning step without being wound onto a bobbin. The drawing treatment may be carried out by a one-stage drawing method in which the yarn is drawn to the desired draw ratio in one step, or by a multi-stage drawing method in which the yarn is drawn to the desired draw ratio by two or more drawing steps.

[0092] The temperature for the drawing treatment may be 80 to 120° C. When the temperature is 80° C. or higher, sufficient fiber strength can be easily ensured and thread breakage is less likely to occur. When the temperature is 120° C. or lower, a favorable fiber feel can be easily obtained.

[0093] The method for producing hair fiber according to this embodiment may include a heat treatment step of heat treating (annealing) the yarn (drawn yarn) obtained in the drawing step after the drawing step. By performing the heat treatment step, the thermal shrinkage rate of the drawn yarn can be reduced. The heat treatment step can be performed before the fiber treatment step.

[0094] 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 immediately after the stretching treatment, or may be carried out after a period of time has elapsed after the film has been taken up.

[0095] The method for producing hair fibers according to this embodiment may include a processing step of processing the yarn (drawn yarn) after the heat treatment step. In the processing step, for example, the yarn may be subjected to a shaping process. The heat treatment step may be carried out before or after the fiber treatment step.

[0096] The hair accessory according to this embodiment comprises the hair fiber according to this embodiment. The hair accessory according to this embodiment is an article that can be attached to or detached from the head, and may be in a form consisting of the hair fiber according to this embodiment (for example, a fiber bundle of the hair fiber). Examples of hair accessories include wigs, hairpieces, braids, hair extensions, and false hair. [Example]

[0097] The present invention will be described in more detail below with reference to examples, but the present invention is not limited to these examples. In the following, the notations "1.79E-01", "1.79E-02", "1.E+09", "9.E+08", etc. mean "1.79 x 10 -1 ", 1.79 x 10 -2 ", "1×10 9 "," 9×10 8 " etc.

[0098] <Preparing the base fiber> The following fibers were prepared as base fibers. Base fiber A: A fiber made from a mixture of polyvinyl chloride (Taiyo PVC Co., Ltd., product name "TH-700") and acrylonitrile-styrene copolymer (Denka Co., Ltd., product name "GR-AT-6S"), polyvinyl chloride content: 50% by mass or more, acrylonitrile-styrene copolymer content: 30% by mass, moment of inertia of area of ​​weak axis: 10 × 10 -4 mm 4 Fibers spun from a nozzle having an outlet cross section of 40 to 70 decitex (fibers produced by the solution spinning method), with an average fineness of 40 to 70 decitex (average fineness of 100 fibers) Base fiber B: Polyvinyl chloride (Taiyo PVC Co., Ltd., product name "TH-700") fiber, with a moment of inertia of 10 × 10 -4 mm 4 Fibers spun from a nozzle having an outlet cross section of 40 to 70 decitex (fibers produced by the solution spinning method), with an average fineness of 40 to 70 decitex (average fineness of 100 fibers) Base fiber C: A fiber made of acrylonitrile-styrene copolymer (Denka Co., Ltd., product name "GR-AT-6S"), with a moment of inertia of 10 × 10 -4 mm 4 Fibers spun from a nozzle having an outlet cross section of 40 to 70 decitex (fibers produced by the solution spinning method), with an average fineness of 40 to 70 decitex (average fineness of 100 fibers) Base fiber D: PET (Mitsui Chemicals, Inc., product name "J125S") fiber, weak axis second moment of area is 10 × 10 -4 mm 4 Fibers spun from a nozzle having an outlet cross section of 40 to 70 decitex (fibers produced by the melt spinning method), with an average fineness of 40 to 70 decitex (average fineness of 100 fibers) Base fiber E: Fiber made of polyamide resin (Asahi Kasei Chemicals Corporation, product name "Leona 1500"), with a moment of inertia of 10 × 10 -4 mm 4 Fibers spun from a nozzle having an outlet cross section of 40 to 70 decitex (fibers produced by the solution spinning method), with an average fineness of 40 to 70 decitex (average fineness of 100 fibers) Base fiber F: Polypropylene (Sumitomo Chemical Co., Ltd., product name "Sumitomo Noblen S131") fiber, weak axis second moment of area is 10 × 10 -4 mm 4 Fibers spun from a nozzle having an outlet cross section of 40 to 70 decitex (fibers produced by the melt spinning method), with an average fineness of 40 to 70 decitex (average fineness of 100 fibers) Base fiber G: A fiber made of vinyl chloride-acrylonitrile copolymer (copolymerization ratio 50:50, weight average molecular weight 80,000 to 130,000), with a moment of inertia of 10 × 10 -4 mm 4 Fibers spun from a nozzle having an outlet cross section of 40 to 70 decitex (fibers produced by the solution spinning method), with an average fineness of 40 to 70 decitex (average fineness of 100 fibers)

[0099] <Preparation of fiber treatment agent> Fiber treatment agents were prepared by mixing the components shown in each table. The content of each component in the fiber treatment agent, the total amount of surface treatment agent components (oil 1, oil 2, nonionic surfactant, and cationic surfactant), and the total amount of oils (oil 1 and oil 2) and nonionic surfactant are based on the total amount of the fiber treatment agent. The following reagents were used as oil 1, oil 2, nonionic surfactant, and cationic surfactant.

[0100] (Oil content 1: Triglyceride) Triglyceride 1: Medium-chain fatty acid triglyceride, triglyceride mainly composed of octanoic acid (carbon number 8), iodine value 4 or less, Kao Corporation, product name "Coconard RK" Triglyceride 2: Triglyceride consisting mainly of coconut oil and lauric acid (carbon number 12), iodine value 7-11, Nikko Chemicals Co., Ltd., product name "NIKKOL TRIFAT C-24" Triglyceride 3: Olive fruit oil, triglyceride mainly composed of oleic acid (18 carbon atoms, abbreviated as 18:1), iodine value 79-88, Nikko Chemicals Co., Ltd., product name "NIKKOL Olive Oil" Triglyceride 4: Sunflower seed oil, a triglyceride consisting mainly of linoleic acid (18 carbon atoms, abbreviated as 18:2) and oleic acid (18 carbon atoms, abbreviated as 18:1), iodine value 120-139, Nikko Chemicals Co., Ltd., product name "NIKKOL Sunflower Oil" Triglyceride 5: Rosehip oil (Rosa canina fruit oil), a triglyceride consisting mainly of linoleic acid (18 carbons, abbreviated as 18:2) and linolenic acid (18 carbons, abbreviated as 18:3), iodine value 170-190, Nikko Chemicals Co., Ltd., product name "NIKKOL Rosehip Oil"

[0101] (Oil 2: fatty acid alkyl or saturated aliphatic hydrocarbon) Octyl oleate: In-house preparation, iodine value 80-90 Isopropyl myristate: Nikko Chemicals Co., Ltd., product name "NIKKOL IPM-100", iodine value 0.5 or less Liquid paraffin: Sonneborn, trade name "KLEAROL", iodine value 0.5 or less

[0102] (nonionic surfactant) Polyoxyethylene octyl ether: carbon chain carbon number 8, HLB value 10.1, in-house preparation Polyoxyethylene decyl ether: carbon chain length 10, HLB value 9.0, Aoki Oil & Fat Industries Co., Ltd., product name "Fine Surf D-1303" Polyoxyethylene oleyl ether: carbon chain length 18, HLB value 5.0, Aoki Oil & Fat Industries Co., Ltd., product name "Brownon EN-1502" Polyoxyethylene oleyl ether: carbon chain length 18, HLB value 7.9, Aoki Oil & Fat Industries Co., Ltd., product name "Brownon EN-1504" Polyoxyethylene stearyl ether: carbon chain length 18, HLB value 9.2, Aoki Oil & Fat Co., Ltd., product name "Brownon SR-705" Polyoxyethylene oleyl ether: carbon chain length 18, HLB value 10.8, Aoki Oil & Fat Industries Co., Ltd., product name "Brownon EN-1507" Polyoxyethylene oleyl ether: carbon chain length 18, HLB value 13.6, Aoki Oil & Fat Industries Co., Ltd., product name "Brownon EN-1513.5" Polyoxyethylene oleyl ether: carbon chain length 18, HLB value 15.4, Aoki Oil & Fat Industries Co., Ltd., product name "Brownon EN-1520A" Polyoxyethylene behenyl ether: carbon chain length 22, HLB value 9.7, in-house preparation Polyoxyethylene tetracosanoic acid ester: carbon chain length 24, HLB value 9.3, in-house preparation

[0103] (cationic surfactant) The cation (R y1 : Methyl group, R y2 : Nonadecyl group (carbon number 19), Y 1 , Y 2 , Y 3 and Y4 : Quaternary ammonium salt having an ethylene group, m: 2-15, n: 2-15) and a phosphate ion: In-house preparation

[0104] <Preparation of fibers for evaluation> The base fiber was stretched at 100°C, and then the fiber treatment agent was applied to the base fiber by roll transfer. The conditions for roll transfer were a roll radius of 125 mm, the roll was immersed in the fiber treatment agent up to a height of 20 mm from the bottom end of the roll, and the roll rotation speed was 0.2 to 8 m / min. Annealing was then performed at 110°C to obtain single fibers with a single fiber fineness of 20 to 100 decitex. The draw ratio was 3.25 times, and the relaxation rate during annealing was 25%. The relaxation rate during annealing was calculated by dividing the circumference of the roller closest to the outlet of the annealing furnace by the circumference of the roller closest to the inlet of the annealing furnace.

[0105] Then, using a gear machine (NEW YAKI BRAID CRIMPING M / C-2.5mm / SUNG JIN INDUSTRIAL CO.,LTD.), the above single fibers were subjected to shaping processing under the conditions of a gear pitch of 2.5mm, preheating at 90°C, a gear roll temperature of 90°C, and a gear roll rotation speed of 1m / m, to obtain evaluation fibers (fibers for artificial hair).

[0106] Because the relative amounts of the surface treatment agent components (oil 1, oil 2, nonionic surfactant, and cationic surfactant) in the evaluation fibers tend to be similar to the relative amounts in the fiber treatment agent, the amount of surface treatment agent components attached to the surface of the evaluation fibers (unit: mass%) was calculated using the following formula based on the solid content extracted from the evaluation fibers by solvent extraction. The total amount of the surface treatment agent components (oil 1, oil 2, nonionic surfactant, and cationic surfactant) in the evaluation fibers, as well as the total amount of oil (oil 1 and oil 2) and nonionic surfactant in the evaluation fibers, are shown in each table, based on the total amount of oil (oil 1 and oil 2) and nonionic surfactant in the evaluation fibers. The contents of oil 1, oil 2, and nonionic surfactant are also shown in each table, based on the total amount of oil (oil 1 and oil 2) and nonionic surfactant in the evaluation fibers. Adhesion amount [mass %] = (mass of extracted solids [g] / mass of evaluation fiber before extraction [g]) × (content of target surface treatment agent component in fiber treatment agent [mass %] / content of all surface treatment agent components in fiber treatment agent [mass %]) × 100

[0107] In the solvent extraction method described above, 2 g of the fiber to be evaluated was weighed into a 300 mL beaker, followed by the addition of 100 mL of a solvent consisting of a 1:1 mixture of n-hexane and ethanol. The mixture was then stirred at 1200 rpm for 10 minutes using a magnetic stirrer, followed by treatment in an ultrasonic cleaner (USC-55Z38S / Ultrasonic Industrial Co., Ltd.) for 10 minutes to obtain an evaluation sample. The evaluation sample was then filtered through No. 5A filter paper, after which the beaker, evaluation sample, and filter paper were washed with 20 mL of a 1:1 mixture of n-hexane and ethanol. The volatile components of the resulting filtrate, including the solvent and water, were dried and solidified at 80 °C. The mass of the dried material after complete evaporation of the water was determined as the mass of the extracted solids.

[0108] <Evaluation of the evaluation fiber> The combing properties, slipperiness, stickiness resistance, and antistatic properties of the above-mentioned evaluation fibers were evaluated. In Comparative Examples 1 to 5 and 7, slipperiness, stickiness resistance, and antistatic properties were not evaluated. The results are shown in each table.

[0109] (Combability) The above-mentioned evaluation fibers were bundled to obtain a fiber bundle having a length of 600 mm and a mass of 120 g. Ten hair fiber treatment technicians (with at least five years of work experience) ran a hand comb through the fiber bundle and evaluated the ease of combing their fingers into two ranks: "difficult to comb" and "easy to comb." Then, the combability was evaluated according to the following criteria. A: 0 people rated it as difficult to comb B: 1 to 4 people rated it as difficult to comb C: 5-8 people rated it as difficult to comb D: 9 or more people rated it as difficult to comb

[0110] (Slip resistance) The above-mentioned evaluation fibers were bundled to obtain a fiber bundle 300 mm long and 10 g in mass. A urethane terminal was then moved from a position 60 mm or more away from one end of the fiber bundle toward the other end of the fiber bundle at a speed of 10 mm / sec over a distance of 45 mm, and the average dynamic friction coefficient was measured using a static and dynamic friction measuring device (manufactured by TRINITY-LAB, product name "TL201Tt").

[0111] (stickiness resistance) The above-mentioned evaluation fiber was folded in the middle to obtain a fiber bundle with a length of 600 mm and a mass of 120 g. Ten hair fiber processing technicians (with at least five years of work experience) evaluated the fiber bundle by touch (the degree of stickiness felt when the fiber bundle was pressed with the palm of their hand) and ranked it into two ranks, "not sticky" and "sticky," and then evaluated its stickiness resistance according to the following criteria. A: 9 or more people rated it as not sticky B: 5 to 8 people rated it as not sticky C: 1 to 4 people rated it as not sticky D: 0 people rated it as not sticky

[0112] (antistatic) The above-mentioned evaluation fibers were bundled to obtain a fiber bundle having a length of 600 mm and a mass of 20 g. The fiber bundle was then left in an environment of 23°C and 50% RH for 24 hours, and then measured at an applied voltage of 10 V using a digital ultra-high resistance / microcurrent meter (ADVANTEST Co., Ltd., product name: R8340A) to measure the current per unit area of ​​the fiber bundle to 1 cm. 2 The surface resistance value (unit: Ω / sq. (square)) per unit area was measured. Antistatic properties were evaluated based on the average value of five measurements. The average values ​​are shown in each table.

[0113] [Table 1]

[0114] [Table 2]

[0115] [Table 3]

[0116] [Table 4]

[0117] [Table 5]

Claims

1. The fabric comprises a base fiber, a first oil component, a second oil component, and a nonionic surfactant; the first oil, the second oil, and the nonionic surfactant are present on at least a portion of the surface of the base fiber; the first oil is a triglyceride; The second oil component is at least one selected from the group consisting of fatty acid alkyls and saturated aliphatic hydrocarbons, the nonionic surfactant has a carbon chain having 10 to 22 carbon atoms, the HLB value of the nonionic surfactant is 6.0 to 14.0, The total amount of the first oil, the second oil, and the nonionic surfactant is 0.01 to 1.6 mass% based on the total amount of the hair fiber.

2. 2. The hair fiber according to claim 1, wherein the content of the first oil component is 3 to 90 mass%, the content of the second oil component is 3 to 90 mass%, and the content of the nonionic surfactant is 2 to 80 mass%, based on the total amount of the first oil component, the second oil component, and the nonionic surfactant.

3. 2. The hair fiber according to claim 1, wherein the base fiber comprises at least one material selected from the group consisting of a vinyl chloride homopolymer, a vinyl chloride-acrylonitrile copolymer, polyethylene terephthalate, a polyamide resin, polypropylene, and an acrylonitrile-styrene copolymer.

4. 2. The hair fiber of claim 1, wherein said triglycerides comprise triglycerides with an iodine value of 165 or less.

5. 2. The hair fiber according to claim 1, wherein the second oil component comprises at least one selected from the group consisting of a fatty acid alkyl having a structure derived from a monocarboxylic acid and a fatty acid alkyl having a structure derived from a dicarboxylic acid.

6. The fiber further comprises a cationic surfactant present on at least a portion of the surface of the base fiber, 2. The hair fiber according to claim 1, wherein the cationic surfactant comprises a quaternary ammonium salt having a cation having a structure represented by the following general formula (Y): 【Chemistry 1】 [In the formula, R ｙ１ and R ｙ２ each independently represents an alkyl group; Y １ , Y ２ , Y ３ and Y ４ each independently represents an alkylene group, and m and n each independently represent an integer of 1 or more.

7. A hair accessory comprising the hair fiber according to any one of claims 1 to 6.

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