Fiber for hair and hair decorative

Abstract

A fiber for hair having a base fiber and an oil component present on at least a portion of the surface of the base fiber, the fiber for hair having a dynamic friction coefficient [mu] k of 0.25 or more and a difference [mu] s-[mu] k between a static friction coefficient [mu] s and the dynamic friction coefficient [mu] k of 0-0.05.

Description

Technical Field

[0001] This invention relates to fibers for hair and hair ornaments. Background Technology

[0002] Hair-related fibers can be used in hair accessories. Patent Document 1 discloses a technique in which, even for vinyl chloride resin fibers, a prescribed fiber treatment agent is used to treat the substrate fibers in order to provide the fibers with good luster and / or smoothness, non-frizziness, and excellent fluffiness.

[0003] Existing technical documents

[0004] Patent documents

[0005] Patent Document 1: Japanese Patent Application Publication No. 2002-285470 Summary of the Invention

[0006] The problem the invention aims to solve

[0007] For hair fibers, from the perspective of preventing user discomfort, the fiber bundles must be both easy to maneuver and non-slip. Here, the ease with which fingers can pass through the fiber bundle when combing, and the non-slip properties of the fiber bundle, such as when weaving the fiber bundle, refer to the ease with which the fibers slip. If slippage is too good, problems such as the woven fiber bundle slipping and unraveling can occur. Furthermore, in addition to ease of maneuverability and non-slip properties, excellent softness of the fiber bundle is also required for hair fibers.

[0008] The present invention was made in view of the above-mentioned problems, and its object is to provide a hair fiber with excellent fiber bundle unobstructedness, non-slip properties, and softness, and a hair ornament having the hair fiber.

[0009] Solution for solving the problem [1]

[0011] A hair fiber having the following characteristics:

[0012] Substrate fiber, and

[0013] At least a portion of the oil present on the surface of the substrate fibers,

[0014] The coefficient of kinetic friction μk of the hair fiber is 0.25 or higher.

[0015] The difference between the static friction coefficient μs and the dynamic friction coefficient μk, |μs-μk|, is 0~0.05. [2]

[0017] According to the hair fiber described in [1], the oil contains a compound with a fatty acid backbone and a polyalkylene glycol. [3]

[0019] According to the hair fiber described in [2], the content of the polyalkylene glycol is 50 to 98% by mass relative to the total amount of oil. [4]

[0021] The hair fiber according to [2] or [3], wherein the average degree of polymerization of the polyalkylene glycol is 4 to 40. [5]

[0023] Hair fiber according to any one of [2] to [4], wherein the compound containing a fatty acid skeleton contains at least one of glycerides and organic acid glycerides. [6]

[0025] The hair fiber according to any one of [1] to [5], wherein the oil content is 0.05 to 2.0 by mass relative to the total amount of the hair fiber. [7]

[0027] The hair fiber according to any one of [1] to [6] further comprises at least a portion of a nonionic surfactant present on the surface of the substrate fiber.

[0028] The nonionic surfactant comprises polyoxyethylene fatty acid ester.

[0029] The content of the nonionic surfactant is 10 to 50% by mass relative to the total content of the oil and the nonionic surfactant. [8]

[0031] The hair fiber according to any one of [1] to [7] further comprises at least a portion of a cationic surfactant present on the surface of the substrate fiber.

[0032] The cationic surfactant comprises a quaternary ammonium salt as shown in the following general formula (1).

[0033]

[0034] [In the formula, R] 1 and R 2 Each independently represents an alkyl group, Y 1 Y 2 Y 3 and Y 4 Each of these characters independently represents an alkylene group, and m and n independently represent integers greater than or equal to 1. [9]

[0036] Hair fiber according to any one of [1] to [8], wherein the base fiber comprises at least one selected from the group consisting of a homopolymer of vinyl chloride, a vinyl chloride-acrylonitrile copolymer, polyethylene terephthalate, a polyamide resin, polypropylene, and an acrylonitrile-styrene copolymer.

[10]

[0038] A hair ornament comprising hair fibers as described in any one of [1] to [9].

[0039] The effects of the invention

[0040] According to the present invention, a hair fiber with excellent fiber bundle unobstructedness, non-slip properties, and softness is provided, as well as a hair ornament incorporating the hair fiber. Detailed Implementation

[0041] Hereinafter, embodiments of the present invention (hereinafter referred to as "this embodiment") will be described in detail, but the present invention is not limited thereto and various modifications can be made without departing from its spirit.

[0042] 1. Hair fibers

[0043] The hair fiber of this embodiment has a base fiber and at least a portion of oil present on the surface of the base fiber. The hair fiber has a dynamic friction coefficient μk of 0.25 or more and a difference between the static friction coefficient μs and the dynamic friction coefficient μk, |μs-μk|, of 0 to 0.05.

[0044] While conventional hair fibers often exhibit excellent fiber bundle unblocking properties, they are prone to slipping and have poor weaving ability; conversely, while they may not slip and have excellent weaving ability, they often suffer from poor unblocking properties. In contrast, this embodiment achieves a balance between unblocking properties and non-slipping characteristics by applying oil to the surface of the substrate fibers as described above and specifying the static friction coefficient μs and the dynamic friction coefficient μk. The various structures will be described in detail below.

[0045] 1.1. Substrate Fiber

[0046] There are no particular restrictions on the base fiber; for example, vinyl chloride resins, polyolefin resins, polyamide resins, polyester resins, ethylene-vinyl alcohol resins, and other resins can be listed.

[0047] There are no particular limitations on vinyl chloride-based resins; examples include vinyl chloride homopolymers and vinyl chloride copolymers. A single vinyl chloride resin can be used alone, or in combination with two or more.

[0048] There are no particular limitations on what constitutes a vinyl chloride copolymer. Examples include vinyl chloride-vinyl acetate copolymer resin, vinyl chloride-vinyl propionate copolymer resin, and other copolymer resins of vinyl chloride and vinyl esters; vinyl chloride-butyl acrylate copolymer resin, vinyl chloride-2-ethylhexyl acrylate copolymer resin, and other copolymer resins of vinyl chloride and acrylates; vinyl chloride-ethylene copolymer resin, vinyl chloride-propylene copolymer resin, and other copolymer resins of vinyl chloride and olefins; vinyl chloride-acrylonitrile copolymer resin, mixtures of vinyl chloride resin and vinyl chloride resin, and vinyl chloride-acrylonitrile copolymer.

[0049] Among these, a mixture of vinyl chloride resin and vinyl chloride resin, or a vinyl chloride-acrylonitrile copolymer, is preferred. Using such resins tends to further improve qualities such as processability, lubricity, and tactile feel.

[0050] As a polyolefin resin, there are no particular limitations; examples include polyethylene, polypropylene, ethylene-vinyl acetate copolymer, ethylene-ethyl acrylate copolymer, and ethylene-propylene copolymer.

[0051] There are no particular limitations on the polyamide resin used; examples include nylon 6, nylon 66, nylon 11, nylon 12, nylon 6.10, nylon 6.12, or copolymers thereof. A single polyamide resin may be used alone, or two or more may be used in combination.

[0052] As a polyester resin, there are no particular limitations. Examples include aromatic polyester resins such as polyethylene terephthalate, polyethylene terephthalate, polybutylene terephthalate, and polyethylene naphthalate; and aliphatic polyester resins such as polylactic acid, polyhydroxybutyric acid, polycaprolactone, polybutylene succinate, polybutylene adipate, polyethylene succinate, polyglycolic acid, poly-3-hydroxypropionate, and poly-3-hydroxybutyrate.

[0053] As an ethylene-vinyl alcohol resin, there are no particular restrictions as long as it is a copolymer of ethylene and vinyl alcohol.

[0054] Other resins are not particularly limited, for example acrylonitrile-styrene copolymer, acrylonitrile-styrene-butadiene terpolymer, ethylene-(meth)acrylate copolymer, etc.

[0055] In the above-mentioned materials, the preferred substrate fiber is at least one selected from the group consisting of a homopolymer of vinyl chloride, a vinyl chloride-acrylonitrile copolymer, polyethylene terephthalate, a polyamide resin, polypropylene, and an acrylonitrile-styrene copolymer. Using such a fiber tends to further improve processability, tactile feel, and other qualities, while further reducing manufacturing costs. The artificial hair fiber of this embodiment can be used alone or in combination with two or more types.

[0056] 1.2. Oil content

[0057] The hair fiber of this embodiment has an oil content on at least a portion of the surface of the base fiber. By having an oil content, the fiber bundle is less prone to slippage, and the softness of the fiber bundle is also improved. The oil content is not particularly limited; examples include compounds containing a fatty acid backbone, polyalkylene glycols, silicones, and liquid paraffin. One type of oil content may be used alone, or two or more may be used in combination.

[0058] The preferred oil component is a compound containing a fatty acid backbone or a polyalkylene glycol; more preferably, it contains both a compound containing a fatty acid backbone and a polyalkylene glycol. By using such an oil component, there is a tendency to further improve the fiber bundle's flowability, its resistance to slippage, and its softness.

[0059] The oil content relative to the total amount of hair fibers is preferably 0.05~2.0% by mass, 0.10~1.50% by mass, 0.15~1.00% by mass, and 0.20~0.50% by mass. When the oil content is 0.05% by mass or more, there is a tendency for further improvement in softness. When the oil content is 2.0% by mass or less, there is a tendency for further improvement in resistance to stickiness and slippage.

[0060] 1.2.1. Compounds containing fatty acid backbones

[0061] The compound containing a fatty acid backbone is not particularly limited, and examples include fatty acids, glycerides, and glycerides of organic acids. Preferably, it contains at least one of glycerides and glycerides of organic acids. By using such a compound containing a fatty acid backbone, there is a tendency to further improve the flowability and non-slip properties of the fiber bundles, as well as the softness of the fiber bundles.

[0062] As fatty acids, there are no particular restrictions; examples include saturated fatty acids such as stearic acid, palmitic acid, myristic acid, lauric acid, and decanoic acid, as well as unsaturated fatty acids such as oleic acid.

[0063] In this embodiment, glycerides refer to compounds in which fatty acids form ester bonds with one or more hydroxyl groups of glycerol. Glycerides are also called monoglycerides, diglycerides, or triglycerides depending on the number of bonds formed by the fatty acids. There are no particular limitations on such glycerides; examples include glyceryl monostearate, glyceryl monopalmitate, glyceryl monomyristate, glyceryl monolaurate, glyceryl monodecanoate, and their diglycerides and triglycerides.

[0064] In this embodiment, the organic acid glyceride refers to a compound in which a fatty acid and an organic acid are respectively ester-bonded to the hydroxyl group of glycerol. There are no particular limitations on the organic acid; examples include acetic acid, lactic acid, citric acid, succinic acid, and diacetyl tartaric acid. Similarly, there are no particular limitations on such organic acid glycerides; examples include monoglycerides of citrate, monoglycerides of succinate, and monoglycerides of lactate.

[0065] The content of compounds containing fatty acid skeletons relative to the total oil content is preferably 2-60% by mass, 3-50% by mass, 4-40% by mass, 5-30% by mass, 6-20% by mass, and 6-15% by mass. By keeping the content of compounds containing fatty acid skeletons within the above range, there is a tendency to further improve softness and non-slip properties.

[0066] 1.2.2. Polyalkylene glycols

[0067] There are no particular limitations on what constitutes a polyalkylene glycol; examples include polyethylene glycol, polypropylene glycol, and polyethylene glycol-polypropylene glycol copolymers.

[0068] The average degree of polymerization of polyalkylene glycols is preferably 2-50, 3-40, 4-30, 4-20, 4-16, or 4-12. By setting the average degree of polymerization of polyalkylene glycols to 50 or less, there is a tendency to further improve their non-slip properties.

[0069] The content of polyalkylene glycol relative to the total oil content is preferably 40-98% by mass, 50-97% by mass, 60-96% by mass, 70-95% by mass, 80-94% by mass, or 85-94% by mass. With a polyalkylene glycol content of 40% by mass or more, there is a tendency for further improvement in softness and non-slip properties.

[0070] 1.3. Surfactants

[0071] The substrate fibers of this embodiment may have a surfactant on at least a portion of their surface. By having a surfactant, there is a tendency to further improve softness, non-slip properties, permeability, and resistance to stickiness.

[0072] The surfactant is not particularly limited, and examples include nonionic surfactants, cationic surfactants, and anionic surfactants. Preferably, it includes at least one of nonionic and cationic surfactants.

[0073] The total surfactant content relative to 100 parts by weight of oil is preferably 5-40 parts by weight, 10-30 parts by weight, or 15-25 parts by weight. By keeping the surfactant content within the above range, there is a tendency to further improve softness, non-slip properties, flowability, and resistance to stickiness.

[0074] 1.3.1. Nonionic surfactants

[0075] As a nonionic surfactant, there are no particular limitations. Examples include polyoxyethylene fatty acid esters, polyoxyethylene alkyl ethers, polyoxyethylene hydrogenated castor oil ethers, polyoxyethylene alkylphenyl ethers, sorbitan fatty acid esters, polyoxyethylene sorbitan fatty acid esters, sucrose fatty acid esters, glycerol fatty acid esters, polyoxyethylene polyoxypropylene block polymers, polyoxyethylene alkylamine ethers, and fatty acid alkanolamides.

[0076] Polyoxyethylene fatty acid esters are preferred. By using such nonionic surfactants, there is a tendency to further improve softness, non-slip properties, flowability, and resistance to stickiness.

[0077] As polyoxyethylene fatty acid esters, there are no particular restrictions as long as the compound has a polyalkylene glycol backbone and a fatty acid backbone. Examples include polyethylene glycol monostearate, polyethylene glycol distearate, polyethylene glycol monopalmitate, polyethylene glycol dipalmitate, polyethylene glycol monomyristate, polyethylene glycol monolaurate, and polyethylene glycol monodecanoate.

[0078] The average degree of polymerization of the polyalkylene glycol backbone bonded to the polyoxyethylene fatty acid ester is preferably 5-80, 10-70, 15-60, or 20-50. By setting the average degree of polymerization of the polyalkylene glycol within the above range, there is a tendency to further improve its non-slip properties.

[0079] The content of nonionic surfactant relative to the total content of oil and nonionic surfactant is preferably 5-60% by mass, 10-50% by mass, 10-40% by mass, or 10-30% by mass. By keeping the content of nonionic surfactant within the above range, there is a tendency to further improve softness, non-slip properties, flowability, and resistance to stickiness.

[0080] 1.3.2. Cationic surfactants

[0081] As a cationic surfactant, there are no particular limitations. Examples include quaternary ammonium salts with oxyalkylene groups as shown in general formula (1); quaternary ammonium salts with alkyl groups such as alkyltrimethylammonium salt, dialkyldimethylammonium salt, and alkyldimethylethylammonium salt; ammonium salts with ester bonds such as stearyloxymethylpyridinium salt, fatty acid triethanolamine, and fatty acid triethanolamine formate; and amine derivatives with alkyl chains such as polyoxyethylene alkylamine, N-alkylpropyleneamine, and N-alkylpolyethylene polyamine.

[0082] Among them, the quaternary ammonium salt shown in general formula (1) is preferred. By using such a cationic surfactant, there is a tendency to further improve softness, non-slip properties, flowability, and resistance to stickiness.

[0083]

[0084] [In the formula, R] 1 and R 2 Each independently represents an alkyl group, Y 1 Y 2 Y 3 and Y 4 Each of these characters independently represents an alkylene group, and m and n independently represent integers greater than or equal to 1.

[0085] In the above formula (1), there is no particular limitation on the alkyl group, such as methyl, ethyl, n-propyl, isopropyl, n-butyl, isobutyl, sec-butyl, tert-butyl, n-pentyl, neopentyl, n-hexyl, tert-hexyl, n-heptyl, n-octyl, n-ethylhexyl, n-nonyl, n-decyl, cyclopropyl, cyclobutyl, cyclopentyl, cyclohexyl, cyclooctyl, etc.

[0086] In the above formula (1), there is no particular limitation on the alkylene group, such as ethylene, propyleneene, trimethylene, tetramethylene, hexamethylene, etc.

[0087] In the above formula (1), m and n are each an integer greater than or equal to 1, preferably 2 to 20.

[0088] The content of cationic surfactant relative to the total content of oil and nonionic surfactant is preferably 1.0 to 10% by mass, 2.00 to 7.5% by mass, and 3.0 to 5.0% by mass. By keeping the content of cationic surfactant within the above range, there is a tendency to further improve softness, non-slip properties, flowability, and resistance to stickiness.

[0089] 1.4. Other additives

[0090] In the hair fiber of this embodiment, other additives may also be used as needed. These other additives may be attached to the surface of the artificial hair fiber or mixed into the resin composition constituting the fiber. There are no particular limitations on these other additives; examples include light stabilizers, flame retardants, and heat stabilizers.

[0091] 1.5. Coefficient of friction

[0092] The coefficient of kinetic friction μk of the hair fiber is 0.25 or higher, preferably 0.27 to 0.60, 0.29 to 0.55, 0.31 to 0.50, 0.33 to 0.45, or 0.35 to 0.40. By making the coefficient of kinetic friction μk 0.25 or higher, there is a tendency to further improve the non-slip property.

[0093] The static friction coefficient μs of the hair fibers is preferably 0.24~0.55, 0.26~0.50, 0.28~0.45, 0.30~0.40, or 0.32~0.38. By keeping the static friction coefficient μs within the above range, there is a tendency to further improve softness, non-slip properties, and permeability.

[0094] Furthermore, the difference between the static friction coefficient μs and the dynamic friction coefficient μk, |μs-μk|, is 0~0.05, preferably 0~0.04, 0~0.03, or 0~0.02. By making the difference |μs-μk| less than 0.05, there is a tendency to further improve softness, non-slip properties, and flowability.

[0095] The dynamic friction coefficient μk, the static friction coefficient μs, and the difference |μs-μk| can be controlled, for example, by the composition of the oil and / or surfactant. Specifically, they can be appropriately adjusted according to the carbon number and / or amount of the polyalkylene glycol, the carbon number and / or amount of the fatty acid in the fatty acid backbone compound, and the type and / or amount of the surfactant.

[0096] The dynamic friction coefficient μk and the static friction coefficient μs can be determined using the methods described in the examples.

[0097] 1.6. Method for manufacturing hair fibers

[0098] There are no particular limitations on the method for manufacturing hair fibers according to this embodiment. For example, a method having the following steps can be listed: a spinning step in which a composition comprising a resin constituting a base fiber and an additive as required is spun to obtain a base fiber; and an attachment step in which an oil and a surfactant as required are attached to the obtained base fiber.

[0099] In the spinning process, a composition containing resin constituting the base fiber and additives as needed can be extruded and melt-spun within a barrel temperature range of 150℃~190℃ and a nozzle temperature of 180±15℃. The cross-sectional shape of the nozzle used at this time can be appropriately set according to the cross-sectional shape of the artificial hair fiber to be produced.

[0100] Additionally, the unstretched substrate fibers spun from the nozzle are introduced into a heated cylinder (heated cylinder temperature 250°C) for instantaneous heat treatment, and then wound up using a traction machine positioned approximately 4.5m directly below the nozzle. During this winding, the traction speed can be adjusted to achieve the desired fineness of the unstretched filament.

[0101] It should be noted that when forming the resin composition into unstretched filaments, conventionally known extruders can be used. For example, single-screw extruders, anti-screw twin-screw extruders, and conical twin-screw extruders can be used.

[0102] The unstretched substrate fibers obtained as described above can be subjected to stretching or heat treatment. As an example, the unstretched substrate fibers can be stretched to 3 times their original length using a stretching machine (105°C in air atmosphere), and then subjected to heat treatment at 0.75 times their original length using a heat treatment machine (110°C in air atmosphere) (heat shrinkage until the fiber length shrinks to 75% of its original length before treatment), so that the fineness is 48~62 denier, and fibers for artificial hair can be produced.

[0103] In the adhesion process, oil and, if necessary, surfactant are adhered to the obtained substrate fibers. The adhesion method is not particularly limited; the fiber treatment agent containing oil and surfactant can be adhered to the substrate fibers via roller transfer printing, or the substrate fibers can be impregnated in the fiber treatment agent. It should be noted that the adhesion amount can also be adjusted by adjusting the concentration of oil and surfactant in the fiber treatment agent.

[0104] 2. Hair accessories

[0105] The hair accessory of this embodiment includes the aforementioned hair fibers. There are no particular limitations on the type of hair accessory; examples include full-head wigs, hair pieces, braids, and extension hair.

[0106] Example

[0107] The present invention will now be described in more detail using examples and comparative examples. The present invention is not limited to the following examples.

[0108] 1. Preparation of fiber treatment agent

[0109] The fiber treatment agent is obtained by mixing oil, surfactant, solvent, and water according to the compositions shown in Tables 1-3. It should be noted that, unless otherwise specified, the content values ​​of each component in the fiber treatment agent in Tables 1-3 refer to wt%. Furthermore, Tables 1-3 only show the wt% of oil and surfactant contained in the fiber treatment agent; the others are solvent and water.

[0110] <Preparation of Substrate Fibers>

[0111] The following fibers are prepared as the base material fibers.

[0112] Substrate Fiber A: Fiber obtained by melt spinning from a nozzle using 70% by weight of polyvinyl chloride (Taio Vinyl Chloride Co., Ltd., trade name "TH-700") and 30% by weight of acrylonitrile-styrene copolymer (Denka Co., Ltd., trade name "GR-AT-6S") as raw materials.

[0113] Substrate Fiber B: Fiber obtained by melt spinning from a nozzle using polyvinyl chloride (Taiyo Vinyl Chloride Co., Ltd., trade name "TH-700") as raw material.

[0114] Substrate fiber C: Fiber obtained by melt spinning from a nozzle using acrylonitrile-styrene copolymer (Denka Corporation, trade name "GR-AT-6S") as raw material.

[0115] Substrate fiber D: Fiber obtained by melt spinning from nozzles using PET (Mitsui Chemicals, Ltd., trade name "J125S") as raw material.

[0116] Substrate fiber E: Fiber obtained by melt spinning from a nozzle using polyamide resin (Asahi Kasei Chemicals Co., Ltd., trade name "Leona 1500") as raw material.

[0117] Substrate fiber F: Fiber obtained by melt spinning from a nozzle using polypropylene (Sumitomo Chemical Co., Ltd., trade name "Sumitomo Noblen S131") as raw material.

[0118] 2. Evaluation of fiber production

[0119] After stretching the substrate fibers at 100°C, the fiber treatment agent prepared above is applied to each substrate fiber using a roller transfer method. As for the roller transfer conditions, the roller radius is 125 mm, the roller is immersed in the fiber treatment agent from the bottom to a height of 20 mm, and the roller speed is 0.2~8 m / min. Then, annealing is performed at 110°C to obtain single fibers with a single fineness of 20~100 dtex.

[0120] Using a gear machine (NEW YAKI BRAID CRIMPING M / C-2.5mm / SUNG JIN INDUSTRIAL CO.,LTD.), the above-mentioned single fiber was shaped under the conditions of a gear pitch of 2.5mm, preheating at 90°C, gear roller temperature of 90°C, and gear roller rotation speed of 1m / m, thereby obtaining the evaluation fiber (fiber for artificial hair).

[0121] [Table 1]

[0122]

[0123] [Table 2]

[0124]

[0125] [Table 3]

[0126]

[0127] The detailed information of each component recorded in Tables 1-3 is as follows:

[0128] (polyalkylene glycol)

[0129] • Polyethylene glycol (average degree of polymerization 4): PEG-200 made from Aoki oil.

[0130] • Polyethylene glycol (average degree of polymerization 8): PEG-400 made from Aoki oil.

[0131] • Polyethylene glycol (average degree of polymerization 12): PEG-600 made from Aoki oil)

[0132] • Polyethylene glycol (average degree of polymerization 20): PEG-1000 made from Aoki oil)

[0133] • Polyethylene glycol (average degree of polymerization 30): PEG-1540 made from Aoki oil)

[0134] (Compounds containing fatty acid skeletons)

[0135] • Glyceryl succinate: Riken Vitamin B-10

[0136] • Citric acid monoglyceride: Riken Vitamin K-30

[0137] • Glyceryl monostearate: Emulsion-based EMALEX GMS-B (Japan)

[0138] • Glyceryl monopalmitate: Fujifilm and Wako Pure Chemical Industries Co., Ltd. W01COBQC-0880

[0139] Stearic acid: Kao Lunac S-98

[0140] Palmitic acid: New Nippon Rikan Pharmaceutical Co., Ltd. palmitic acid P

[0141] [Nonionic surfactants]

[0142] • Polyethylene glycol (PEG-30) monostearate: EMLEX 830 (Japan)

[0143] • Polyethylene glycol (PEG-40) monostearate: EMALEX 840 manufactured in Japan

[0144] • Polyethylene glycol (PEG-12) distearate: EMLEX 600di-S manufactured in Japan

[0145] [Catonic surfactants]

[0146] ·Quaternary ammonium salt type cationic surfactant (satisfying formula (1)): Yoshimura Oil Chemical Co., Ltd. F-20

[0147] 3. Evaluation

[0148] 3.1. Coefficient of friction

[0149] The above evaluation was performed using fiber bundles to obtain a fiber bundle with a length of 300 mm and a mass of 10 g. Then, a polyurethane terminal (TRINITY-LAB, tactile contact, finger model) was moved from a position 100 mm from one end of the fiber bundle toward the other end at a moving speed of 10 mm / sec, a moving distance of 45 mm, and a load of 200 g. The static and dynamic coefficients of friction were measured using a static / dynamic friction measuring machine (TRINITY-LAB, trade name "TL201T t").

[0150] In addition, the friction at the beginning of sliding is taken as the static friction coefficient, and the average value after sliding is taken as the dynamic friction coefficient.

[0151] 3.2. Softness

[0152] The above evaluation was performed using fiber bundles to obtain fiber bundles with a length of 600 mm and a weight of 120 g. Based on the feel of 10 hair fiber processing technicians (with more than 5 years of practical experience) (the softness felt when touching the fiber bundle with the palm of their hand in a compressed manner), the softness was determined according to the following criteria.

[0153] A: 9 or more people rated it as soft.

[0154] B: 5-8 people rated it as soft

[0155] C: 1-4 people rated it as soft

[0156] D: 0 people rated it as soft

[0157] 3.3. Non-slip property

[0158] The aforementioned evaluation fibers were bundled together and bent in the center to obtain a fiber bundle with a length of 600 mm and a weight of 120 g. Based on the degree of non-slippage of the fibers as felt by 10 hair fiber processing technicians (with more than 5 years of practical experience) when weaving them in a three-strand pattern, two levels of judgment were made: "non-slippage" and "easy slippage". Finger passability was then judged according to the following criteria.

[0159] A: 0 people rated it as easy to scroll.

[0160] B: 1-4 people rated it as easy to slide.

[0161] C: 5-8 people rated it as easy to slide.

[0162] D: 9 or more people rated it as easy to slide.

[0163] 3.4. Unobstructed flow

[0164] The above evaluation was performed using fiber bundles to obtain fiber bundles with a length of 600 mm and a weight of 120 g. Based on the ease of finger passage felt by 10 hair fiber treatment technicians (with more than 5 years of practical experience) when they combed through the fiber bundles, two levels of judgment were made: "poor passage" and "good passage". Finger passage was then judged according to the following criteria.

[0165] A: 0 people rated it as having poor flowability.

[0166] B: 1-4 people rated it as having poor flowability.

[0167] C: 5-8 people rated it as having poor flowability.

[0168] D: 9 or more people rated it as having poor flowability.

[0169] 3.5. Resistance to stickiness

[0170] The above-mentioned fiber bundles were bent in the center to obtain a fiber bundle with a length of 600 mm and a weight of 120 g. Based on the feel of 10 hair fiber processing technicians (with more than 5 years of practical experience) (the degree of stickiness felt when touching the fiber bundle with the palm of their hand), a two-level judgment of "non-sticky" and "sticky" was made, and the stickiness resistance was judged according to the following criteria.

[0171] A: More than 9 people rated it as non-sticky.

[0172] B: 5-8 people rated it as non-sticky.

[0173] C: 1-4 people rated it as non-sticky.

[0174] D: 0 people rated it as not sticky.

[0175] Industrial availability

[0176] The present invention has industrial applicability as a synthetic hair fiber used in artificial hair such as wigs, full-head wigs, and hairpieces that can be attached to or removed from the head.

Claims

1. A hair fiber comprising: a base fiber and an oil present on at least a portion of the surface of said base fiber. The coefficient of kinetic friction μk of the hair fiber is 0.25 or higher. The difference between the static friction coefficient μs and the dynamic friction coefficient μk, |μs-μk|, is 0~0.

05.

2. The hair fiber according to claim 1, wherein, The oil contains compounds with a fatty acid backbone and polyalkylene glycols.

3. The hair fiber according to claim 2, wherein, The content of the polyalkylene glycol is 50-98% by mass relative to the total amount of oil.

4. The hair fiber according to claim 2, wherein, The average degree of polymerization of the polyalkylene glycol is 4 to 40.

5. The hair fiber according to claim 2, wherein, The compound containing a fatty acid skeleton contains at least one of glycerides and organic acid glycerides.

6. The hair fiber according to claim 1, wherein, The oil content is 0.05 to 2.0% by mass relative to the total amount of hair fibers.

7. The hair fiber according to claim 1, further comprising at least a portion of a nonionic surfactant present on the surface of the substrate fiber. The nonionic surfactant comprises polyoxyethylene fatty acid ester. The content of the nonionic surfactant is 10 to 50% by mass relative to the total content of the oil and the nonionic surfactant.

8. The hair fiber according to claim 1, further comprising at least a portion of a cationic surfactant present on the surface of the substrate fiber. The cationic surfactant comprises a quaternary ammonium salt represented by the following general formula (1). In the formula, R 1 and R 2 Each independently represents an alkyl group, Y 1 Y 2 Y 3 and Y 4 Each of them independently represents an alkylene group, and m and n independently represent integers greater than 1.

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

10. A hair accessory comprising hair fibers as described in any one of claims 1 to 9.

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