Fiber treatment agent

Abstract

To provide a fiber treatment agent for producing human hair fibers for headdress products that have excellent shape durability and tensile modulus while maintaining the natural look of human hair, and further highly maintain the original elasticity (toughness) of human hair fibers.SOLUTION: Provided is a fiber treatment agent for treating human hair fibers separated from the human head, which contains a condensation produced from components (A) and (B), and a component (C), and has a turbidity of 1,000 NTU or less. (A): formaldehyde or a hydrate thereof, (B): a triazine derivative represented by the general formula (1) [where, R1 to R3 may be the same or different and represents a hydrogen atom, a hydroxymethylamino group, an amino group, a hydroxyl group, a halogen atom, a phenyl group, a linear or branched alkyl or alkenyl group with 1 to 6 carbon atoms, and the like ], and (C): water.SELECTED DRAWING: None

Description

[Technical Field]

[0001] The present invention relates to a fiber treating agent for semi-permanently or permanently changing the shape of human hair fibers as industrial materials. [Background technology]

[0002] BACKGROUND ART Conventionally, fibers using artificial hair and fibers using human hair are widely known as fibers to be implanted in head accessories such as wigs.

[0003] Advantages of head accessories made with artificial hair include high heat resistance, which allows straight hair to be easily curled or straightened using a heating tool such as a curling iron (hereinafter referred to as "shape imparting ability"), and the ability to maintain the curled or straight shape created with a heating tool even under high temperature and humidity conditions such as during bathing or washing hair (hereinafter referred to as "shape retention"). Furthermore, head accessories made with artificial hair are superior in that they are stiffer and stronger than human hair. However, head accessories made with artificial hair have drawbacks, such as a smooth surface that is highly glossy and has an unnatural texture, making it difficult to achieve the original purpose of head accessories, which is to create a natural-looking hairstyle.

[0004] The advantage of head accessories made with human hair is that they have a texture and luster similar to one's own hair, and they look natural when worn. Many people who wear head accessories do not want others to know that they are wearing them, so the natural appearance is a major advantage.

[0005] However, head accessories made with human hair also have drawbacks. To impart a uniform shape and color to the human hair used in head accessories, the hair undergoes many processes, starting with chemical treatment to remove the cuticle, followed by bleaching and dyeing, which can cause damage during the process (Patent Document 1), and are known to have durability issues (Patent Document 2). Furthermore, with the rise in aesthetic consciousness in recent years, more people are placing importance on appearance, and more people are enjoying various hairstyles with a single head accessory. However, while human hair can be easily curled or straightened using a thermal tool such as a curling iron (shape imparting ability), it cannot maintain the curled or straightened shape formed with the thermal tool even under high-temperature and high-humidity conditions such as during bathing or washing the hair (shape retention is lacking), and in order to achieve such semi-permanent or permanent transformations, special chemical treatments such as permanent waving have been required every time.

[0006] To compensate for these drawbacks of human hair, for example, Patent Document 1 discloses a hair fiber bundle that improves on the drawback of human hair, such as poor shape retention, without impairing the excellent properties of human hair, by blending human hair with polyester fibers having specific physical properties. Also, Patent Document 2 discloses a head accessory product that improves on the drawback of human hair products, such as the accumulation of frizz, by blending regenerated collagen fibers with human hair, while also providing the permanent wave performance that is a drawback of regenerated collagen fibers. [Prior art documents] [Patent documents]

[0007] [Patent Document 1] International Publication No. 2005 / 037000 Brochure [Patent Document 2] Japanese Patent Application Laid-Open No. 2007-177370 [Patent Document 3] Japanese Patent Application Publication No. 2019-143282 Summary of the Invention [Problem to be solved by the invention]

[0008] However, the techniques described in Patent Documents 1 and 2 still have the drawback of looking unnatural, since they involve a mixture of human hair and artificial hair, and are not sufficient in terms of naturalness of appearance.

[0009] To solve these problems, Patent Document 3 discloses a fiber treatment agent and a method for treating human hair fibers, which contain formaldehyde and a melamine derivative and are used to produce human hair fibers for wigs that have excellent shape retention and durability (elastic modulus) while maintaining the natural appearance of human hair.

[0010] However, in the manufacturing of head accessories, hair may be stretched strongly, and the stretchability (tenacity) of the processed human hair fibers may not be sufficient with the technology described in Patent Document 3. For this reason, there has been a demand for further increasing the stretchability of the processed human hair fibers to prevent breakage during stretching.

[0011] Therefore, the present invention relates to a fiber treatment agent and a fiber treatment method for producing human hair fibers for head accessories that have excellent shape retention and tensile modulus while maintaining the natural appearance of human hair, and furthermore, maintain the elasticity (tenacity) of human hair fibers to a higher degree. [Means for solving the problem]

[0012] The present inventors have discovered that when the fiber treatment agent described in Patent Document 3 is used according to the method for treating human hair fibers described therein, the composition in which the human hair fibers are immersed changes through three phases. Specifically, in Phase 1, the composition contains formaldehyde and a melamine derivative that are free to react with each other, resulting in a high turbidity. In Phase 2, the formaldehyde and the melamine derivative react to form a water-soluble condensate, which makes the composition transparent. In Phase 3, the water-soluble condensates further bond together to form a water-insoluble condensate, and the turbidity of the composition increases again.

[0013] The inventors have found that when human hair fibers are brought into contact with the Phase 1 composition, free formaldehyde acts directly on the human hair fibers, cross-linking the tissue and making it difficult for the human hair fibers to maintain their elasticity (tenacity). On the other hand, when human hair fibers are brought into contact with the Phase 3 composition, a hard resin layer is formed on the surface of the human hair fibers, restricting the movements of the human hair fibers, such as bending and stretching, making it difficult for the human hair fibers to maintain their elasticity (tenacity), and further worsening the feel of the surface of the human hair fibers.

[0014] Based on the above findings, the inventors furthered their research and discovered that by treating human hair fibers separated from a person's head with a composition containing a condensate of formaldehyde and a specific triazine derivative with a turbidity of 1000 or less, while maintaining the turbidity of the treatment agent at 1000 NTU or less, it is possible to impart shape retention to the human hair fibers, improve the tensile modulus, and also maintain a high level of stretchability (tenacity), and further improve the feel of the surface of the human hair fibers, thereby completing the invention.

[0015] The present invention provides a fiber treating agent for treating human hair fibers separated from a person's head, the fiber treating agent comprising a condensate formed from the following components (A) and (B), and component (C), and having a turbidity of 1000 NTU or less. (A): Formaldehyde or its hydrate (B): Triazine derivative represented by general formula (1)

[0016] [ka]

[0017] [In the formula, R 1 ~R 3may be the same or different and represent a hydrogen atom, a hydroxymethylamino group, an amino group, a hydroxyl group, a halogen atom, a phenyl group, a linear or branched alkyl or alkenyl group having from 1 to 6 carbon atoms, or a linear or branched alkoxy or alkenyloxy group having from 1 to 6 carbon atoms. (C):Water

[0018] The present invention further provides a method for producing a fiber treatment agent for treating human hair fibers separated from a person's head, which comprises heating a composition containing the above-mentioned components (A) to (C) until the turbidity becomes 1000 NTU or less.

[0019] The present invention further provides a method for treating fibers, comprising the following step (i): (i) a step of immersing human hair fibers separated from a person's head in the fiber treatment agent and treating the fibers while maintaining the turbidity of the treatment agent at 1000 NTU or less;

[0020] The present invention further provides a method for producing human hair fibers for head accessories, which comprises treating human hair fibers by the above-mentioned fiber treatment method.

[0021] The present invention further provides a method for producing a head accessory, which comprises treating human hair fibers by the fiber treatment method described above.

[0022] The present invention also provides human hair fibers for head accessories, which contain a condensate formed from the components (A) and (B).

[0023] The present invention also provides a head ornament product comprising human hair fibers as a component, which contains a condensate formed from the above components (A) and (B). [Effects of the Invention]

[0024] According to the present invention, it is possible to provide a fiber treatment agent for producing human hair fibers for head accessories, which have excellent shape retention and tensile modulus while maintaining the natural appearance of human hair, and furthermore, which highly maintains the inherent stretchability (tenacity) of human hair fibers. DETAILED DESCRIPTION OF THE INVENTION

[0025] [Condensation product formed from components (A) and (B)] The fiber treatment agent of the present invention contains a condensate of component (A) formaldehyde or a hydrate thereof and component (B) a triazine derivative represented by general formula (1). This condensate may include not only the water-soluble condensates described above, but also water-insoluble condensates formed by further linking water-soluble condensates together, so long as the turbidity of the fiber treatment agent is 1000 NTU or less. In this specification, the term "condensate" refers to both water-soluble and water-insoluble condensates. Furthermore, in addition to these condensates, unreacted components (A) and (B) may remain in the fiber treatment agent of the present invention, so long as the turbidity is 1000 NTU or less.

[0026] (Component (A): Formaldehyde or its hydrate) An example of a hydrate of formaldehyde is formaldehyde monohydrate (methanediol). Among these, formaldehyde is preferred from the viewpoint of imparting higher shape retention and durability to the treated human hair fibers.

[0027] The content of constituent elements derived from component (A) in the fiber treatment agent of the present invention is preferably 0.1% by mass or more, more preferably 1% by mass or more, even more preferably 2.5% by mass or more, and even more preferably 5% by mass or more, from the viewpoint of imparting high shape retention and strength to human hair fibers after treatment, and in addition to the above viewpoints, from the viewpoint of formulation compatibility, it is preferably 60% by mass or less, more preferably 50% by mass or less, even more preferably 40% by mass or less, even more preferably 35% by mass or less, and even more preferably 30% by mass or less. That is, the content of the constituent elements derived from component (A) in the fiber treatment agent of the present invention is preferably 0.1 to 60 mass%, more preferably 1 to 50 mass%, even more preferably 2.5 to 40 mass%, even more preferably 5 to 35 mass%, and even more preferably 5 to 30 mass%, from the viewpoint of imparting high shape retention and strength to treated human hair fibers and from the viewpoint of formulation compatibility. In this specification, the term "constituent elements derived from component (A)" refers to the total content of the constituent parts derived from component (A) in the condensate and the remaining component (A).

[0028] (Component (B): Triazine derivative represented by general formula (1)) The triazine derivative used in the present invention is represented by the following general formula (1).

[0029] [ka]

[0030] [In the formula, R 1 ~R 3 may be the same or different and represent a hydrogen atom, a hydroxymethylamino group, an amino group, a hydroxyl group, a halogen atom, a phenyl group, a linear or branched alkyl or alkenyl group having from 1 to 6 carbon atoms, or a linear or branched alkoxy or alkenyloxy group having from 1 to 6 carbon atoms.

[0031] Examples of the triazine derivative represented by general formula (1) include melamine, monomethylolmelamine, dimethylolmelamine, trimethylolmelamine, benzoguanamine, acetoguanamine, 2,4-diamino-1,3,5-triazine, ammeline, and 2-chloro-4,6-diamino-1,3,5-triazine. From the viewpoint of imparting high shape retention and durability to the treated human hair fibers, at least one selected from melamine, monomethylolmelamine, dimethylolmelamine, and trimethylolmelamine is preferred, with melamine being more preferred. Component (B) can be used alone or in combination of two or more types.

[0032] The content of constituent elements derived from component (B) in the fiber treatment agent of the present invention is preferably 0.1% by mass or more, more preferably 1% by mass or more, even more preferably 2.5% by mass or more, and even more preferably 5% by mass or more, from the viewpoint of imparting high shape retention and strength to human hair fibers after treatment, and in addition to the above viewpoints, from the viewpoint of improving the feel of the surface of human hair fibers, it is preferably 60% by mass or less, more preferably 50% by mass or less, even more preferably 40% by mass or less, even more preferably 35% by mass or less, and even more preferably 30% by mass or less. That is, the content of the constituent elements derived from component (B) in the fiber treatment agent of the present invention is preferably 0.1 to 60 mass%, more preferably 1 to 50 mass%, even more preferably 2.5 to 40 mass%, even more preferably 5 to 35 mass%, and even more preferably 5 mass% or more and 30 mass% or less, from the viewpoint of imparting higher shape retention and strength to the treated human hair fibers and improving the feel of the surface of the human hair fibers. In this specification, the term "constituent elements derived from component (B)" refers to the total content of the constituent parts derived from component (B) in the condensate and the remaining component (B).

[0033] The total content of the components derived from component (A) and the components derived from component (B) in the fiber treatment agent of the present invention is preferably more than 1% by mass, more preferably 2.5% by mass or more, even more preferably 5% by mass or more, and even more preferably 10% by mass or more, from the viewpoint of imparting high shape retention and strength to human hair fibers after treatment, and is preferably 80% by mass or less, more preferably 70% by mass or less, even more preferably 60% by mass or less, even more preferably 50% by mass or less, and even more preferably 40% by mass or less, from the viewpoint of improving the feel of the surface of the human hair fibers.

[0034] The molar ratio (A) / (B) of the components derived from component (A) to the components derived from component (B) in the fiber treatment agent of the present invention is preferably 0.005 or more, more preferably 0.01 or more, even more preferably 0.05 or more, and even more preferably 0.1 or more, from the viewpoint of improving the shape retention and strength of the treated human hair fibers by using a condensate with a larger molecular weight formed by condensation of water-soluble condensates within the human hair fibers, and is also preferably less than 5, more preferably 4 or less, even more preferably 3 or less, and even more preferably 2 or less, from the viewpoint of providing a good feel. That is, the molar ratio (A) / (B) of the components derived from component (A) to the components derived from component (B) is preferably 0.005 or more and less than 5, more preferably 0.01 to 4, even more preferably 0.05 to 3, and even more preferably 0.1 to 2, from the viewpoint of improving the shape retention and strength of the treated human hair fibers by using a condensate with a larger molecular weight formed by condensation of water-soluble condensates within the human hair fibers, and from the viewpoint of providing a good feel.

[0035] The condensation product of component (A) and component (B) can be produced in a composition containing components (A) to (C) by heating the composition. When the composition containing components (A) to (C) is first prepared, component (A) and component (B) exist in a free reacting state with each other, but by heating the composition, the two react to produce a water-soluble condensation product.

[0036] The content of the condensate formed from components (A) and (B) in the fiber treatment agent of the present invention is preferably more than 1% by mass, more preferably 1.5% by mass or more, even more preferably 2.5% by mass or more, even more preferably 5% by mass or more, and even more preferably 10% by mass or more, from the viewpoint of imparting higher shape retention and strength to treated human hair fibers, and in addition to the above viewpoints, from the viewpoint of improving the feel of the surface of human hair fibers, it is preferably 80% by mass or less, more preferably 70% by mass or less, even more preferably 60% by mass or less, even more preferably 50% by mass or less, and even more preferably 40% by mass or less.

[0037] [Component (C): Water] The fiber treating agent of the present invention uses water as a medium, and the content of component (C) in the fiber treating agent of the present invention is preferably 10% by mass or more, more preferably 20% by mass or more, even more preferably 30% by mass or more, still more preferably 40% by mass or more, and is preferably 99% by mass or less, more preferably 97% by mass or less, even more preferably 95% by mass or less, still more preferably 90% by mass or less. That is, the content of component (C) in the fiber treatment agent of the present invention is preferably 10 to 99 mass %, more preferably 20 to 97 mass %, even more preferably 30 to 95 mass %, and even more preferably 40 to 90 mass %.

[0038] [Component (D): Hansen solubility parameter SP value is 16 to 40 MPa] 1 / 2 an organic compound The water-soluble condensates formed from components (A) and (B) gradually bond together, increasing their molecular weight and decreasing their water solubility. However, if an insoluble condensate with a large molecular weight is formed in the fiber treatment agent of the present invention, a hard resin layer will be formed on the surface of the human hair fiber, restricting the movement of the human hair fiber, such as bending and stretching, not only hindering the stretchability (tenacity) of the human hair fiber, but also possibly worsening the feel of the surface of the human hair fiber. The fiber treatment agent of the present invention has a Hansen solubility parameter SP value of 16 MPa, from the viewpoint of preventing aggregation of the condensation oligomers formed from components (A) and (B) that are formed during the reaction and cause an increase in turbidity, and facilitating their dissolution. 1 / 2 More than 40MPa 1 / 2 It is preferable that the component (D) contains an organic compound (excluding organic salts and compounds having an aldehyde group and a molecular weight of 150 or less) that satisfies the following criteria: Charged organic salts, when present in the system, cause a rapid rise in turbidity, and compounds having aldehyde groups such as glutaraldehyde crosslink triazine derivatives at multiple points, causing a rapid rise in turbidity.

[0039] In the present invention, the SP value of the Hansen solubility parameter is the δTot (MPa) calculated at 25°C in a DIY program using the software package HSPiP 4th Edition 4.1.07 based on Hansen Solubility Parameters: A User's Handbook, CRC Press, Boca Raton FL, 2007. 1 / 2 )

[0040] The Hansen solubility parameter SP value of component (D) is 16.0 MPa. 1 / 2 Over 40.0MPa 1 / 2 Examples of the organic compounds that fall within the above range include monohydric alcohols, dihydric alcohols, dihydric alcohol derivatives, trihydric or higher polyhydric alcohols, lactams, imidazolidinones, pyrimidinones, lactones, alkylene carbonates, and other general-purpose organic solvents that have an SP value within the above range.

[0041] Below, the SP value of Hansen's solubility parameter is 16.0MPa. 1 / 2 Over 40.0MPa 1 / 2 Specific examples of certain compounds are listed below. The value in parentheses in each example is the SP value calculated by the method described above. Examples of monohydric alcohols: ethanol (25.4), 1-propanol (22.9), isopropyl alcohol (22.3), 1-butanol (22.9) Examples of dihydric alcohols: ethylene glycol (31.6), diethylene glycol (29.2), triethylene glycol (26.1), tetraethylene glycol (24.3), pentaethylene glycol (23.1), hexaethylene glycol (22.2), propylene glycol (31.7), 1-dipropylene glycol (26.0), tripropylene glycol (23.4) Examples of dihydric alcohol derivatives: dipropylene glycol monomethyl ether (21.1), dipropylene glycol dimethyl ether (17.8), dipropylene glycol diacetate (19.0), dipropylene glycol monomethyl ether acetate (18.5) Examples of trihydric or higher polyhydric alcohols: glycerin (35.7), sorbitol (35.8) Examples of lactams: 2-pyrrolidone (24.8), N-methylpyrrolidone (22.0) Examples of imidazolidinones: ethyleneurea (28.5), 1,3-dimethyl-2-imidazolidinone (22.3), dihydroxymethylethyleneurea (31.3), N,N'-dihydroxymethyl-4,5-dihydroxyethyleneurea (34.7), DMDM ​​hydantoin (28.1) Pyrimidinone example: N,N'-dimethylpropyleneurea (21.3) Example of lactone: γ-butyrolactone (24.6) Examples of alkylene carbonates: ethylene carbonate (29.2), propylene carbonate (27.1) Examples of common organic solvents: DMF (N,N-dimethylformamide) (24.2), DMAc (N,N-dimethylacetamide) (23.0), DMSO (dimethyl sulfoxide) (23.6), THF (tetrahydrofuran) (18.2), 1,4-dioxane (20.5), acetonitrile (23.9)

[0042] Among these, the condensation oligomer consisting of components (A) and (B) that is generated during the reaction and causes an increase in turbidity is prevented from agglomerating and easily dissolved. In order to prevent this, the Hansen solubility parameter SP value is set to 35.8 MPa. 1 / 2 Preferably, it is 34.7 MPa or less. 1 / 2 More preferably, it is 29.2 MPa or less. 1 / 2 From the same viewpoint, it is more preferable that the viscosity is 17.8 MPa or less. 1 / 2 Preferably, it is 21.1 MPa or more. 1 / 2 More preferably, it is 22.0 MPa or more. 1 / 2 More preferably, the above is true.

[0043] Among these, dihydric alcohols, lactams and imidazolidinone are preferred, and at least one selected from diethylene glycol (29.2), triethylene glycol (26.1), N-methylpyrrolidone (22.0), 1,3-dimethyl-2-imidazolidinone (22.3) and DMDM ​​hydantoin (28.1) is more preferred.

[0044] Component (D) can be used alone or in combination of two or more. The content of component (D) in the fiber treatment agent of the present invention is preferably 10% by mass or more, more preferably 15% by mass or more, and even more preferably 25% by mass or more, from the viewpoint of maintaining the turbidity of the fiber treatment agent at 1000 NTU or less for a longer period of time, and is preferably 80% by mass or less, more preferably 60% by mass or less, and even more preferably 45% by mass or less, from the viewpoint of efficiently promoting the condensation reaction and imparting high shape retention and strength to the treated human hair fiber by a condensate with a larger molecular weight formed by bonding of the water-soluble condensates together within the human hair fiber.

[0045] [Cationic surfactant] The fiber treatment agent of the present invention may contain a cationic surfactant within a range that does not impair the effects of the present invention. The cationic surfactant is preferably a mono-long-chain alkyl quaternary ammonium salt having one alkyl group having 8 to 24 carbon atoms and three alkyl groups having 1 to 4 carbon atoms.

[0046] Preferably, the at least one mono-long chain alkyl quaternary ammonium surfactant is selected from compounds represented by the general formula:

[0047] [ka]

[0048] [In the formula, R 4 is a saturated or unsaturated, straight-chain or branched alkyl group having 8 to 22 carbon atoms; R 8 -CO-NH-(CH2) m -or R 8 -CO-O-(CH2)m -(R 8 represents a saturated or unsaturated, linear or branched alkyl chain having 7 to 21 carbon atoms, and m represents an integer of 1 to 4, and R 5 , R 6 and R 7 each independently represents an alkyl group having 1 to 4 carbon atoms or a hydroxylalkyl group having 1 to 4 carbon atoms; X - represents a chloride ion, a bromide ion, a methosulfate ion, or an ethosulfate ion.

[0049] Suitable cationic surfactants include, for example, long-chain quaternary ammonium compounds such as cetyltrimethylammonium chloride, myristyltrimethylammonium chloride, behentrimonium chloride, cetyltrimethylammonium bromide, and stearamidopropyltrimonium chloride, which can be used alone or in mixtures thereof.

[0050] The content of the cationic surfactant in the fiber treatment agent of the present invention is preferably 0.05% by mass or more, more preferably 0.10% by mass or more, and is preferably 10% by mass or less, more preferably 5% by mass or less, from the viewpoint of improving the feel of the treated human hair fibers and further enhancing the effects of the present invention.

[0051] 〔silicone〕 The fiber treatment agent of the present invention may also contain silicone to improve the feel of treated human hair fibers and improve manageability. The silicone is preferably at least one selected from dimethylpolysiloxane and amino-modified silicone.

[0052] As the dimethylpolysiloxane, any cyclic or acyclic dimethylpolysiloxane polymer can be used, and examples thereof include the SH200 series, BY22-019, BY22-020, BY11-026, B22-029, BY22-034, BY22-050A, BY22-055, BY22-060, BY22-083, and FZ-4188 (all manufactured by Dow Corning Toray Co., Ltd.), KF-9088, the KM-900 series, MK-15H, and MK-88 (all manufactured by Shin-Etsu Chemical Co., Ltd.).

[0053] As the amino-modified silicone, any silicone having an amino group or an ammonium group can be used, and examples thereof include amino-modified silicone oil in which all or part of the terminal hydroxyl groups are end-capped with methyl groups or the like, and amodimethicone which is not end-capped. From the viewpoint of improving the feel of human hair fibers after treatment and improving manageability, a preferred amino-modified silicone is, for example, a compound represented by the following formula:

[0054] [ka]

[0055] [wherein R' is a hydrogen atom, a hydroxyl group, or R X indicates R X represents a substituted or unsubstituted monovalent hydrocarbon group having 1 to 20 carbon atoms, and J represents R X , R"-(NHCH2CH2) a NH2, OR X or a hydroxyl group, R" represents a divalent hydrocarbon group having 1 to 8 carbon atoms, a represents a number from 0 to 3, and b and c represent numbers whose sum is, on a number average, 10 or more and less than 20,000, preferably 20 or more and less than 3,000, more preferably 30 or more and less than 1,000, and even more preferably 40 or more and less than 800.

[0056] Specific examples of suitable commercially available amino-modified silicones include amino-modified silicone oils such as SF8452C and SS3551 (both manufactured by Dow Corning Toray Co., Ltd.) and KF-8004, KF-867S, and KF-8015 (both manufactured by Shin-Etsu Chemical Co., Ltd.), and amodimethicone emulsions such as SM8704C, SM8904, BY22-079, FZ-4671, and FZ4672 (both manufactured by Dow Corning Toray Co., Ltd.).

[0057] The content of silicone in the fiber treatment agent of the present invention is preferably 0.1% by mass or more, more preferably 0.2% by mass or more, even more preferably 0.5% by mass or more, from the viewpoint of improving the feel of human hair fibers after treatment and further enhancing the effects of the present invention, and is preferably 20% by mass or less, more preferably 10% by mass or less, even more preferably 5% by mass or less.

[0058] [Cationic polymer] The fiber treating agent of the present invention may also contain a cationic polymer in order to improve the feel of treated human hair fibers.

[0059] The cationic polymer refers to a polymer having a cationic group or a group that can be ionized into a cationic group, and also includes amphoteric polymers that are cationic as a whole. Specifically, examples include aqueous solutions containing amino groups or ammonium groups in the side chains of the polymer chain or containing diallyl quaternary ammonium salts as structural units, such as cationic cellulose derivatives, cationic starch, cationic guar gum derivatives, polymers or copolymers of diallyl quaternary ammonium salts, and quaternized polyvinylpyrrolidone derivatives. Among these, from the viewpoints of improving the effects of softness, smoothness, and ease of combing during rinsing and shampooing, ease of manageability and moisturizing properties after drying, as well as the stability of the agent, one or more polymers containing diallyl quaternary ammonium salts as structural units, quaternized polyvinylpyrrolidone derivatives, and cationic cellulose derivatives are preferred, and one or more polymers or copolymers of diallyl quaternary ammonium salts and cationized cellulose derivatives are more preferred.

[0060] Specific examples of suitable diallyl quaternary ammonium salt polymers or copolymers include dimethyldiallylammonium chloride polymers (Polyquaternium-6, e.g., Merquat 100; Lubrizol Advanced Materials), dimethyldiallylammonium chloride / acrylic acid copolymers (Polyquaternium-22, e.g., Merquat 280, Merquat 295; Lubrizol Advanced Materials), and dimethyldiallylammonium chloride / acrylamide copolymers (Polyquaternium-7, e.g., Merquat 550; Lubrizol Advanced Materials).

[0061] A specific example of a suitable quaternized polyvinylpyrrolidone derivative is a polymer obtained by polymerizing a vinylpyrrolidone copolymer and dimethylaminoethyl methacrylate (Polyquaternium 11, for example, Gafcut 734, Gafcut 755, Gafcut 755N (all manufactured by Ashland)).

[0062] Specific examples of suitable cationized cellulose include polymers in which hydroxycellulose is loaded with glycidyltrimethylammonium chloride (Polyquaternium-10, for example, Leoguard G and GP (both manufactured by Lion Corporation), Polymer JR-125, JR-400, JR-30M, LR-400, and LR-30M (both manufactured by Amerchol)), and hydroxyethylcellulose dimethyl diallylammonium chloride (Polyquaternium-4, for example, Cellcoat H-100 and Cellcoat L-200 (both manufactured by Akzo Nobel)).

[0063] From the viewpoint of improving the feel of treated human hair fibers, the content of the cationic polymer in the fiber treatment agent of the present invention is preferably 0.001% by mass or more, more preferably 0.01% by mass or more, even more preferably 0.05% by mass or more, and is preferably 20% by mass or less, more preferably 10% by mass or less.

[0064] Furthermore, the fiber treating agent of the present invention may contain an antioxidant such as ascorbic acid; or a pH adjuster such as sodium hydroxide, potassium hydroxide, phosphoric acid, or hydrochloric acid.

[0065] [Turbidity] From the viewpoint of maintaining high stretchability (tenacity) of human hair fibers and improving the feel of the surface of human hair fibers, it is desirable for the fiber treatment agent of the present invention to have as low a turbidity as possible. The turbidity of the fiber treatment agent is 1000 NTU or less, preferably 500 NTU or less, more preferably 100 NTU or less, and even more preferably 20 NTU or less. Note that the turbidity of the fiber treatment agent refers to the turbidity caused by component (B) and the water-insoluble condensate formed by bonding of the water-soluble condensates. When the fiber treatment agent contains other components that cause turbidity, only the turbidity caused by component (B) and the water-insoluble condensate is considered. In this case, the water-insoluble condensate can be quantified, for example, by derivatization pyrolysis GC / MS after filtration through a membrane filter with a pore size of 0.1 μm.

[0066] Here, NTU (Nephelometric Turbidity Unit) is a turbidity unit used in nephelometry, using formazin as the turbidity standard. The turbidity of a textile treatment agent can be measured at room temperature (25°C) by placing the textile treatment agent directly into the measurement cell of a digital turbidity meter (manufactured by AS ONE Corporation, model number: TB700).

[0067] [pH] The pH of the fiber treatment agent of the present invention is preferably 6.0 or higher, more preferably 6.5 or higher, and even more preferably 7.0 or higher, from the viewpoint of improving penetration into human hair fibers, and is preferably 12.0 or lower, more preferably 11.5 or lower, and even more preferably 11.0 or lower, from the viewpoint of suppressing damage to human hair fibers. Note that the pH in the present invention is the value at 25°C. That is, the pH of the fiber treatment agent of the present invention is preferably 6.0 to 12.0, more preferably 6.5 to 11.5, and even more preferably 7.0 to 11.0, from the viewpoint of improving penetration into human hair fibers and suppressing damage to human hair fibers.

[0068] [Method for producing fiber treatment agent] The fiber treatment agent of the present invention can be produced by heating a composition containing components (A) to (C) until the turbidity becomes 1000 NTU or less. When the composition containing components (A) to (C) is first prepared, components (A) and (B) exist as free reactants with each other, and the composition is highly turbid. However, by heating the composition, the two react to form a water-soluble condensate, reducing the turbidity of the composition. The fiber treatment agent of the present invention is a composition in this state that has a turbidity of 1000 NTU or less.

[0069] The heating temperature for reducing the turbidity of the composition containing components (A) to (C) to 1000 NTU or less is preferably 85°C or higher, more preferably 88°C or higher, and even more preferably 90°C or higher, from the viewpoint of efficiently promoting the reaction in which components (A) and (B) in the fiber treatment agent react to produce a water-soluble condensate; and is preferably 120°C or lower, more preferably 115°C or lower, and even more preferably 110°C or lower, from the viewpoint of preventing the reaction from becoming too fast and becoming uncontrollable.

[0070] The heating time is preferably 1 minute or longer, more preferably 5 minutes or longer, and preferably 20 minutes or shorter, more preferably 15 minutes or shorter. The temperature is raised to the above-mentioned temperature in a short time, and after confirming that the mixture has become transparent by heating and stirring, it is desirable to quickly cool it down to the fiber application temperature or fiber treatment agent storage temperature described below. If rapid temperature increase is difficult due to scale-up, it is advantageous to raise the temperature while mixing the components other than component (B), and then add component (B) when the mixture has reached the above-mentioned temperature.

[0071] The pH of the composition containing components (A) to (C) when heated is preferably 7.0 or higher, more preferably 8.0 or higher, and even more preferably 9.0 or higher, from the viewpoint of preventing the reaction from becoming too rapid and resulting in phase 3, and is preferably 13.0 or lower, more preferably 12.0 or lower, and even more preferably 11.0 or lower, from the viewpoint of workability, which facilitates pH adjustment when applying to human hair fibers. After the turbidity of the composition reaches 1000 NTU or lower, the pH can be adjusted to the suitable pH range of the fiber treatment agent described above, as necessary.

[0072] [Storage method for fiber treatment agents] When the thus-prepared treatment agent with a turbidity of 1000 NTU or less is transported and stored before application to human hair fibers, the storage temperature can be kept low to prevent unintended reaction from occurring during transportation. The storage temperature is preferably 1°C or higher, more preferably 2°C or higher, and even more preferably 5°C or higher to prevent freezing and recrystallization, and is preferably 25°C or lower, more preferably 20°C or lower, and even more preferably 15°C or lower to prevent unintended reaction from occurring. The pH of the fiber treatment agent during storage is preferably adjusted to a range of 9 to 11, which slows the condensation rate.

[0073] [Fiber treatment method] (Basic processing) By treating human hair fibers using the fiber treatment agent of the present invention using a method including the following step (i), it is possible to impart shape retention and high durability to the human hair fibers while maintaining the elasticity (tenacity) of the human hair fibers at a high level. (i) A step of immersing human hair fibers separated from a human head in the fiber treating agent of the present invention and treating the fibers while maintaining the turbidity of the treating agent at 1000 NTU or less.

[0074] The fiber treatment agent of the present invention having a turbidity of 1000 NTU or less produced as described above may be applied to human hair fibers as is, but the stretchability of the human hair fibers can be further enhanced by heating the agent for a certain period of time before applying it to human hair fibers, so as not to cause an increase in turbidity due to the agent entering Phase 3. For this reason, it is preferable to include the following step (0) before step (i). (0) Heating the fiber treatment agent

[0075] The heating temperature in step (0) is preferably 40°C or higher, more preferably 60°C or higher, and even more preferably 70°C or higher from the viewpoint of improving productivity, and is preferably 120°C or lower, more preferably 105°C or lower, and even more preferably 99°C or lower from the viewpoint of being able to stop heating at an appropriate point.

[0076] The heating time in step (0), when the treatment agent having a turbidity of 1000 NTU or less immediately after preparation is heated and the heating time until the treatment agent changes to phase 3 and the turbidity exceeds 1000 NTU again, is defined as T, is preferably 0.2 T or more, more preferably 0.3 T or more, and even more preferably 0.4 T or more from the viewpoint of exhibiting the stretching effect on human hair fibers, and is preferably 0.8 T or less, more preferably 0.7 T or less, and even more preferably 0.6 T or less from the viewpoint of ensuring the time until the turbidity exceeds 1000 NTU as the treatment agent changes to phase 3, i.e., the time sufficient to treat human hair fibers.

[0077] In step (i), the human hair fibers may be immersed in the fiber treatment agent, which may be dry or wet. The amount of the fiber treatment agent into which the human hair fibers are immersed is, in terms of bath ratio to the mass of the human hair fibers (mass of fiber treatment agent / mass of human hair fibers), preferably 2 or more, more preferably 3 or more, even more preferably 5 or more, even more preferably 10 or more, even more preferably 20 or more, and is preferably 500 or less, more preferably 250 or less, even more preferably 100 or less. That is, the liquor ratio is preferably 2-500, more preferably 3-250, even more preferably 5-100, even more preferably 10-100, and even more preferably 20-100.

[0078] In step (i), the human hair fibers may be fixed with curlers or the like in advance, and then immersed in the fiber treatment agent of the present invention under heating. This allows the human hair fibers to be given a desired shape in addition to shape retention and high durability.

[0079] In step (i), the human hair fibers are immersed in the fiber treatment agent under heating, and this heating is carried out by warming the fiber treatment agent. This heating may be carried out by immersing the human hair fibers in a heated fiber treatment agent, or by immersing the human hair fibers in a low-temperature fiber treatment agent and then heating them. The temperature of the fiber treatment agent is preferably 30°C or higher, more preferably 40°C or higher, and even more preferably 50°C or higher, to enhance the interaction between the water-soluble condensate formed from components (A) and (B) and the proteins in the human hair fibers, and to promote the condensation and growth reaction between the water-soluble condensates formed from components (A) and (B) in the human hair fibers, thereby achieving the effects of the present invention. Furthermore, the temperature is preferably less than 95°C, more preferably 85°C or lower, and even more preferably 75°C or lower, to prevent thermal damage to the human hair fibers.

[0080] The immersion time in step (i), where T is defined as the heating time until the turbidity of the treatment agent exceeds 1000 NTU after heating the treatment agent with a turbidity of 1000 NTU immediately after preparation, is preferably 0.3 T or more, more preferably 0.4 T or more, and even more preferably 0.45 T or more, from the viewpoint of exhibiting the effect of improving the stretchability of human hair fibers, and is preferably 0.95 T or less, more preferably 0.90 T or less, and even more preferably 0.85 T or less, in order to suppress damage to human hair fibers.

[0081] The specific immersion time is adjusted appropriately depending on the heating temperature used, but for example, from the viewpoint of exhibiting the effect of improving the elasticity of human hair fibers, it is preferably 15 minutes or more, more preferably 30 minutes or more, and even more preferably 1 hour or more, and in order to prevent damage to human hair fibers, it is preferably 48 hours or less, more preferably 24 hours or less, and even more preferably 12 hours or less.

[0082] Step (i) is preferably carried out in an environment where evaporation of water is suppressed. Specific means for suppressing evaporation of water include covering the container of the fiber treatment agent in which the human hair fibers are immersed with a film-like substance, cap, lid, or the like made of a material that is impermeable to water vapor.

[0083] After step (i), the human hair fibers may or may not be rinsed, but rinsing is preferred from the viewpoint of preventing the feel of the human hair fibers from being deteriorated by excess polymer.

[0084] These treatments are believed to cause the water-soluble condensates formed from components (A) and (B) to penetrate into the human hair fibers and interact with proteins in the human hair fibers. Furthermore, the water-soluble condensates condense with each other within the human hair fibers, gradually forming condensates with larger molecular weights. These condensates remain within the human hair fibers even after washing, so the shape of the human hair fibers treated by the method of the present invention remains intact even after washing.

[0085] If the turbidity of the treatment agent increases during the treatment in step (i), a hard resin layer will form on the surface of the human hair fiber, making it difficult to maintain a high level of stretchability (tenacity) of the human hair fiber and ensuring a good feel on the surface of the human hair fiber. Therefore, it is preferable to remove the human hair fiber from the treatment agent before the turbidity of the treatment agent exceeds 1000 NTU. The turbidity of the treatment agent can be confirmed by taking a sample from the treatment agent as appropriate and using the turbidity measurement method described above. If the removed human hair fiber is not sufficiently treated, it can be subjected to step (i) again. That is, it is preferable to include the following step (ii) after step (i), and to repeat steps (i) and (ii) two or more times. (ii) Removing the human hair fibers from the treatment solution before the turbidity of the treatment solution exceeds 1,000 NTU.

[0086] After removing the human hair fiber from the treatment agent in the above step (ii), it is preferable to rinse the surface of the human hair fiber to wash away the insoluble condensate. That is, it is preferable to carry out the following step (iii) after step (ii). (iii) Rinse the extracted human hair fibers.

[0087] The rinsing in step (iii) is preferably carried out using a composition containing the aforementioned component (D). This rinsing composition may consist solely of component (D), or may contain water in addition to component (D). When water is contained, the content of component (D) in the rinsing composition is preferably 60% by mass or more, more preferably 80% by mass or more, and even more preferably 95% by mass or more.

[0088] (Post-crosslinking treatment) After steps (i) to (iii), the following step (iv) may be further carried out, which can further improve the shape retention of the human hair fibers. (iv) immersing the human hair fibers in a post-crosslinking agent containing components (E) and (C). (E): at least one formaldehyde derivative selected from formaldehyde, formaldehyde hydrate, glyoxylic acid, glyoxylic acid hydrate, glyoxylate, glyoxal, glyoxal hydrate, glutaraldehyde, and glutaraldehyde hydrate; (C):Water

[0089] The content of component (E) in the post-crosslinking agent is preferably 0.01% by mass or more, more preferably 0.1% by mass or more, even more preferably 1% by mass or more, and is preferably 60% by mass or less, more preferably 40% by mass or less, even more preferably 20% by mass or less. That is, the content of component (E) in the post-crosslinking agent is preferably 0.01 to 60% by mass, more preferably 0.1 to 40% by mass, and even more preferably 1 to 20% by mass.

[0090] Furthermore, the post-crosslinking agent may contain a pH adjuster such as sodium hydroxide, potassium hydroxide, phosphoric acid, hydrochloric acid, organic acid, etc. On the other hand, from the viewpoint of improving the feel of the surface of human hair fibers, it is preferable that the post-crosslinking agent does not contain a triazine derivative of component (B) or a resorcinol derivative of component (F) described below.

[0091] The pH of the post-crosslinking agent is preferably 6.0 or less, more preferably 5.0 or less, and even more preferably 4.5 or less, from the viewpoint of improving the permeability into human hair fibers, and is preferably 0 or more, more preferably 0.5 or more, and even more preferably 1.0 or more, from the viewpoint of suppressing damage to human hair fibers. That is, the pH of the post-crosslinking agent is preferably 0 to 6.0, more preferably 0.5 to 5.0, and even more preferably 1.0 to 4.5, from the viewpoint of improving the permeability into human hair fibers and suppressing damage to human hair fibers.

[0092] The temperature of the post-crosslinking agent used in step (iv) is preferably 40°C or higher, more preferably 50°C or higher, and even more preferably 60°C or higher, from the viewpoint of increasing the interaction between the condensate of components (A) and (B) formed in the human hair fibers and the proteins in the human hair fibers, and thereby enhancing the effects of the present invention (shape retention and strength); and is preferably less than 100°C, more preferably 99°C or lower, from the viewpoint of preventing the treatment agent from boiling violently during heating, entangling the human hair fibers, and reducing operability in the subsequent steps.

[0093] In step (iv), the human hair fiber to be immersed in the post-crosslinking agent may be dry or wet. The amount of the post-crosslinking agent in which the human hair fiber is immersed is, in terms of bath ratio to the mass of the human hair fiber (mass of post-crosslinking agent / mass of human hair fiber treated in steps (i) to (iii)), preferably 2 or more, more preferably 3 or more, even more preferably 5 or more, even more preferably 10 or more, even more preferably 20 or more, and is also preferably 500 or less, more preferably 250 or less, even more preferably 100 or less. That is, the liquor ratio is preferably 2-500, more preferably 3-250, even more preferably 5-100, even more preferably 10-100, and even more preferably 20-100.

[0094] In step (iv), the immersion time of the human hair fiber in the post-crosslinking agent is preferably 1 minute or more, more preferably 3 minutes or more, and even more preferably 5 minutes or more, in order to allow the post-crosslinking agent to penetrate and diffuse into the human hair fiber, and is also preferably 5 hours or less, more preferably 3 hours or less, and even more preferably 1 hour or less.

[0095] (surface finishing treatment) Furthermore, after the steps (i) to (iii) or after the step (iv), the following step (v) may be further carried out, and by carrying out the step (v), the feel of the surface of the human hair fiber can be significantly improved. (v) immersing the human hair fibers in a surface finish (I) containing components (F) and (C). (F): Resorcinol derivative represented by general formula (2)

[0096] [ka]

[0097] [During the ceremony, A 1 ~A 4 may be the same or different and represent a hydrogen atom, a hydroxyl group, a halogen atom, a carboxyl group or a salt thereof, a sulfonic acid group or a salt thereof, a linear or branched alkyl or alkenyl group having 1 to 6 carbon atoms, or a linear or branched alkoxy or alkenyloxy group having 1 to 6 carbon atoms. (C):Water

[0098] In this case, preferred examples of component (F) include resorcinol, 2-methylresorcinol, 4-chlororesorcinol, pyrogallol, etc. From the viewpoint of improving the feel of the surface of human hair fibers, the content of component (F) in the surface finishing agent (I) is preferably 10% by mass or more, more preferably 20% by mass or more, even more preferably 30% by mass or more, even more preferably 40% by mass or more, even more preferably 50% by mass or more, and is preferably 98% by mass or less, more preferably 97% by mass or less, even more preferably 95% by mass or less, even more preferably 90% by mass or less, even more preferably 80% by mass or less.

[0099] Furthermore, the surface finishing agent (I) may contain a pH adjuster such as sodium hydroxide, potassium hydroxide, phosphoric acid, hydrochloric acid, organic acid, etc. On the other hand, from the viewpoint of improving the feel of the surface of human hair fibers, it is preferable that the surface finishing agent (I) does not contain the triazine derivative of component (B) or the formaldehyde derivative of component (E).

[0100] The pH of the surface finishing agent (I) is preferably 7.0 or less, more preferably 6.8 or less, and even more preferably 6.5 or less, from the viewpoint of improving penetration into human hair fibers, and is preferably 0 or more, more preferably 0.5 or more, and even more preferably 1.0 or more, from the viewpoint of suppressing damage to human hair fibers. That is, the pH of the surface finishing agent (I) is preferably 0 to 7.0, more preferably 0.5 to 6.8, and even more preferably 1.0 to 6.5, from the viewpoint of improving the permeability into human hair fibers and suppressing damage to human hair fibers.

[0101] The temperature of the surface finishing agent (I) used in step (v) is preferably 0°C or higher, more preferably 20°C or higher, even more preferably 40°C or higher, from the viewpoint of efficiently penetrating and diffusing the surface finishing agent (I) into the interior of the human hair fibers and further enhancing the effect of improving the feel, and is preferably 80°C or lower, more preferably 60°C or lower.

[0102] In step (v), the human hair fiber immersed in the surface finishing agent (I) may be dry or wet. The amount of the surface finishing agent in which the human hair fiber is immersed is expressed as a bath ratio to the mass of the human hair fiber (mass of surface finishing agent (I) / mass of human hair fiber treated in steps (i) to (iii) or step (iv)), which is preferably 2 or more, more preferably 3 or more, even more preferably 5 or more, even more preferably 10 or more, even more preferably 20 or more, and is preferably 500 or less, more preferably 250 or less, even more preferably 100 or less. That is, the liquor ratio is preferably 2-500, more preferably 3-250, even more preferably 5-100, even more preferably 10-100, and even more preferably 20-100.

[0103] In step (v), the immersion time of the human hair fiber in the surface finishing agent (I) is preferably 1 hour or more, more preferably 3 hours or more, even more preferably 6 hours or more, even more preferably 24 hours or more, in order to allow the surface finishing agent (I) to penetrate and diffuse into the human hair fiber, and is preferably 1 month or less, more preferably 2 weeks or less, even more preferably 10 days or less, even more preferably 168 hours or less.

[0104] [Additional processing that may be added] In addition to the above-mentioned steps (i) to (v), the fiber treatment method of the present invention may further include one or more treatments selected from cuticle removal, bleaching, hair dyeing, and surface finishing for imparting hydrophobicity and reducing friction.

[0105] In this case, each of the cuticle removal, bleaching, and hair dyeing treatments may be performed before or after the above-mentioned steps (i) to (v), or may be performed between steps (i) to (v). Multiple treatments may also be combined and added. When both bleaching and hair dyeing are added, any of the treatments may be performed first, except that bleaching must be performed before hair dyeing. Another treatment, such as cuticle removal, may also be performed between bleaching and hair dyeing.

[0106] On the other hand, surface finishing for imparting hydrophobicity and reducing friction must be carried out after the above-mentioned steps (i) to (iii), or after step (iv) if a post-treatment with a crosslinking agent in step (iv) is also carried out, or after step (v) if a surface finishing for improving the feel in step (v) is also carried out, and in particular, better results can be obtained by additionally carrying out the surface finishing after step (v). Also, as long as the surface finishing for imparting hydrophobicity and reducing friction is carried out at a stage after steps (i) to (iii), step (iv), or step (v) as described above, the order of the treatments with cuticle removal, bleaching, and hair dyeing is not particularly limited.

[0107] (cuticle removal) The cuticles on the surface of human hair fibers have a directional structure, with the scales overlapping, so if human hair fibers with different orientations are mixed in one fiber bundle, they will easily get caught and tangled, significantly impairing workability. Therefore, cuticle removal is performed to remove the orientation of the human hair fibers and make them easier to handle, and is performed by immersing the human hair fibers in the cuticle removal composition described below.

[0108] The cuticle-removing composition contains a chlorine precursor having a cuticle-exfoliating effect and water. Examples of the chlorine precursor include sodium hypochlorite, potassium dichloroisocyanurate, sodium dichloroisocyanurate, and trichloroisocyanuric acid, and one or more chlorine precursors selected from these can be used.

[0109] The content of the chlorine precursor in the cuticle removal composition is preferably 1% by mass or more, more preferably 2% by mass or more, and preferably 15% by mass or less, more preferably 12% by mass or less, and even more preferably 9% by mass or less.

[0110] The pH of the cuticle-removing composition at 25°C is preferably 2.0 or higher, more preferably 3.0 or higher, even more preferably 4.5 or higher, and is preferably 10 or lower, more preferably 8.0 or lower, even more preferably 7.0 or lower.

[0111] (bleaching) Bleaching is performed by immersing the human hair fibers in a bleaching composition containing an alkaline agent, an oxidizing agent, and water. The bleaching composition is usually in a two-part form, with the first part containing an alkaline agent and water, and the second part containing an oxidizing agent and water. The two parts are usually stored separately and mixed before immersing the human hair fibers.

[0112] Suitable alkaline agents include, but are not limited to, for example, ammonia and its salts; alkanolamines (monoethanolamine, isopropanolamine, 2-amino-2-methylpropanol, 2-aminobutanol, etc.) and their salts; alkanediamines (1,3-propanediamine, etc.) and their salts; and carbonates (guanidine carbonate, sodium carbonate, potassium carbonate, sodium bicarbonate, potassium bicarbonate, etc.); and mixtures thereof.

[0113] The content of the alkaline agent in the bleaching composition (a mixture of the first and second agents in the case of a two-component type) is preferably 0.1% by mass or more, more preferably 0.5% by mass or more, even more preferably 1% by mass or more, and is preferably 15% by mass or less, more preferably 10% by mass or less, even more preferably 7.5% by mass or less.

[0114] Suitable oxidizing agents include, but are not limited to, hydrogen peroxide, urea peroxide, melamine peroxide, and sodium bromate, with hydrogen peroxide being preferred.

[0115] The content of the oxidizing agent in the bleaching composition is preferably 1% by mass or more, more preferably 2% by mass or more, and is preferably 15% by mass or less, more preferably 12% by mass or less, and even more preferably 9% by mass or less.

[0116] When the first and second agents are stored separately, the pH of the second agent at 25°C is preferably 2 or higher, more preferably 2.5 or higher, and preferably 6 or lower, more preferably 4 or lower. This pH can be adjusted with a suitable buffer. The pH of the bleaching composition at 25°C is preferably 6 or higher, more preferably 6.5 or higher, even more preferably 6.8 or higher, and preferably 11 or lower, more preferably 10.5 or lower, even more preferably 10 or lower.

[0117] (hair dye) Hair dyeing is performed by immersing human hair fibers in the hair dye composition. The hair dye composition contains a dye and may optionally contain an alkaline agent, an acid, an oxidizing agent, etc. Dyes include direct dyes, oxidative dyes, and combinations thereof.

[0118] The type of direct dye is not particularly limited, and any direct dye suitable for hair dyeing can be used. Examples of direct dyes include anionic dyes, nitro dyes, disperse dyes, cationic dyes, and dyes having an azophenol structure selected from the group consisting of HC Red 18, HC Blue 18, and HC Yellow 16 below, as well as salts thereof and mixtures thereof.

[0119] [ka]

[0120] Examples of cationic dyes include, but are not limited to, Basic Blue 6, Basic Blue 7, Basic Blue 9, Basic Blue 26, Basic Blue 41, Basic Blue 99, Basic Brown 4, Basic Brown 16, Basic Brown 17, Natural Brown 7, Basic Green 1, Basic Orange 31, Basic Red 2, Basic Red 12, Basic Red 22, Basic Red 51, Basic Red 76, Basic Violet 1, Basic Violet 2, Basic Violet 3, Basic Violet 10, Basic Violet 14, Basic Yellow 57, and Basic Yellow 87, and mixtures thereof. Basic Red 51, Basic Orange 31, Basic Yellow 87, and mixtures thereof are particularly preferred.

[0121] Examples of anionic dyes include Acid Black 1, Acid Blue 1, Acid Blue 3, Food Blue 5, Acid Blue 7, Acid Blue 9, Acid Blue 74, Acid Orange 3, Acid Orange 4, Acid Orange 6, Acid Orange 7, Acid Orange 10, Acid Red 1, Acid Red 14, Acid Red 18, Acid Red 27, Acid Red 33, Acid Red 50, Acid Red 52, Acid Red 73, Acid Red 87, Acid Red 88, Acid Red 92, Acid Red 155, Acid Red 180, Acid Violet 2, Acid Violet 9, Acid Violet 43, Acid Violet 49, Acid Yellow 1, Acid Examples of suitable dyes include, but are not limited to, Yellow 10, Acid Yellow 23, Acid Yellow 3, Food Yellow No. 8, D&C Brown No. 1, D&C Green No. 5, D&C Green No. 8, D&C Orange No. 4, D&C Orange No. 10, D&C Orange No. 11, D&C Red No. 21, D&C Red No. 27, D&C Red No. 33, D&C Violet 2, D&C Yellow No. 7, D&C Yellow No. 8, D&C Yellow No. 10, FD&C Red 2, FD&C Red 40, FD&C Red No. 4, FD&C Yellow No. 6, FD&C Blue 1, Food Black 1, Food Black 2, and alkali metal salts thereof (sodium salts, potassium salts, etc.), and mixtures thereof.

[0122] Among these, preferred anionic dyes are Acid Black 1, Acid Red 52, Acid Violet 2, Acid Violet 43, Acid Red 33, Acid Orange 4, Acid Orange 7, Acid Red 27, Acid Yellow 3, and Acid Yellow 10, as well as salts thereof. More preferred anionic dyes are Acid Red 52, Acid Violet 2, Acid Red 33, Acid Orange 4, and Acid Yellow 10, as well as salts and mixtures thereof.

[0123] Examples of nitro dyes include HC Blue No. 2, HC Blue No. 4, HC Blue No. 5, HC Blue No. 6, HC Blue No. 7, HC Blue No. 8, HC Blue No. 9, HC Blue No. 10, HC Blue No. 11, HC Blue No. 12, HC Blue No. 13, HC Brown No. 1, HC Brown No. 2, HC Green No. 1, HC Orange No. 1, HC Orange No. 2, HC Orange No. 3, HC Orange No. 5, HC Red BN, HC Red No. 1, HC Red No. 3, HC Red No. 7, HC Red No. 8, HC Red No. 9, HC Red No. 10, HC Red No. 11, HC Red No. 13, HC Red No. 54, HC Red No. 14, HC Violet BS, HC Examples of suitable HC pigments include, but are not limited to, HC Violet No. 1, HC Violet No. 2, HC Yellow No. 2, HC Yellow No. 4, HC Yellow No. 5, HC Yellow No. 6, HC Yellow No. 7, HC Yellow No. 8, HC Yellow No. 9, HC Yellow No. 10, HC Yellow No. 11, HC Yellow No. 12, HC Yellow No. 13, HC Yellow No. 14, HC Yellow No. 15, 2-amino-6-chloro-4-nitrophenol, picramic acid, 1,2-diamino-4-nitrobenzole, 1,4-diamino-2-nitrobenzole, 3-nitro-4-aminophenol, 1-hydroxy-2-amino-3-nitrobenzole, and 2-hydroxyethylpicramic acid, and mixtures thereof.

[0124] Disperse dyes include, for example, but are not limited to, Disperse Blue 1, Disperse Black 9, and Disperse Violet 1, and mixtures thereof.

[0125] These direct dyes can be used alone or in combination of two or more kinds, and direct dyes with different ionic properties can also be used in combination.

[0126] The content of the direct dye in the hair dye composition is preferably 0.001% by mass or more, more preferably 0.01% by mass or more, and even more preferably 0.05% by mass or more, from the viewpoint of obtaining sufficient hair dyeing properties, and is preferably 10% by mass or less, more preferably 7.5% by mass or less, even more preferably 5.0% by mass or less, and even more preferably 3.0% by mass or less, from the viewpoint of blendability.

[0127] If the hair dye composition contains only direct dyes as dyes, an oxidizing agent is not required to dye human hair fibers, but if it is desired to lighten the color of human hair fibers, an oxidizing agent can be included in the composition.

[0128] When a hair dye composition contains an oxidation dye, it is usually in a two-part form, with the first part containing an oxidation dye intermediate (precursor and coupler) and an alkaline agent, and the second part containing an oxidizing agent such as hydrogen peroxide. These two parts are usually stored separately and mixed before immersing human hair fibers.

[0129] The oxidation dye intermediate is not particularly limited, and any known precursors and couplers that are commonly used in hair dye products can be suitably used.

[0130] Examples of precursors include paraphenylenediamine, toluene-2,5-diamine, 2-chloro-paraphenylenediamine, N-methoxyethyl-paraphenylenediamine, N-phenyl-paraphenylenediamine, N,N-bis(2-hydroxyethyl)-paraphenylenediamine, 2-(2-hydroxyethyl)-paraphenylenediamine, 2,6-dimethyl-paraphenylenediamine, 4,4'-diaminodiphenylamine, 1,3-bis(N-(2-hydroxyethyl)-N-(4-aminophenyl)amino)-2-propanol, PEG-3,3,2'-paraphenylenediamine, paraaminophenol, paramethylaminophenol, 3-amino-2-propanol, 2-amino-1-propanol, 1-amino-2 ... 4,5-Diamino-1-hydroxyethylpyrazole, 4,5-di ...

[0131] Examples of couplers include metaphenylenediamine, 2,4-diaminophenoxyethanol, 2-amino-4-(2-hydroxyethylamino)anisole, 2,4-diamino-5-methylphenetole, 2,4-diamino-5-(2-hydroxyethoxy)toluene, 2,4-dimethoxy-1,3-diaminobenzene, 2,6-bis(2-hydroxyethylamino)toluene, 2,4-diamino-5-fluorotoluene, 1,3-bis(2,4-diaminophenoxy)propane, meta-aminophenol, 2-methyl-5-aminophenol, 2-methyl-5-(2-hydroxyethylamino)phenol, 2,4-dichloro-3-aminophenol, 2-chloro-3-amino-6-methylphenol, 2-methyl-4-chloro-5-aminophenol, N-cyclopentyl-meta-aminophenol, 2-methyl-4-methoxy-5-(2-hydroxyethylamino)phenol, 2-methyl-4-fluoro-5-aminophenol, and para-amino ortho-cresol. sol, resorcinol, 2-methylresorcinol, 4-chlororesorcinol, 1-naphthol, 1,5-dihydroxynaphthalene, 1,7-dihydroxynaphthalene, 2,7-dihydroxynaphthalene, 2-isopropyl-5-methylphenol, 4-hydroxyindole, 5-hydroxyindole, 6-hydroxyindole, 7-hydroxyindole, 6-hydroxybenzomorpholine, 3,4-methylenedioxyphenol, 2-bromo-4,5-methylenedioxyphenol Examples of suitable hydroxybenzoates include, but are not limited to, 3,4-methylenedioxyaniline, 1-(2-hydroxyethyl)amino-3,4-methylenedioxybenzene, 2,6-dihydroxy-3,4-dimethylpyridine, 2,6-dimethoxy-3,5-diaminopyridine, 2,3-diamino-6-methoxypyridine, 2-methylamino-3-amino-6-methoxypyridine, 2-amino-3-hydroxypyridine, 2,6-diaminopyridine, and salts of these substances and mixtures thereof.

[0132] The contents of the precursor and coupler in the hair dye composition are each preferably 0.01% by mass or more, more preferably 0.1% by mass or more, and preferably 10% by mass or less, more preferably 7.5% by mass or less, and even more preferably 5% by mass or less.

[0133] When the hair dye composition contains an oxidation dye, it further contains an alkaline agent. Suitable alkaline agents include, but are not limited to, ammonia and its salts, alkanolamines (monoethanolamine, isopropanolamine, 2-amino-2-methylpropanol, 2-aminobutanol, etc.) and their salts, alkanediamines (1,3-propanediamine, etc.) and their salts, and carbonates (guanidine carbonate, sodium carbonate, potassium carbonate, sodium bicarbonate, potassium bicarbonate, etc.), and mixtures thereof.

[0134] The content of the alkaline agent in the hair dye composition is preferably 0.1% by mass or more, more preferably 0.5% by mass or more, even more preferably 1% by mass or more, and is preferably 15% by mass or less, more preferably 10% by mass or less, even more preferably 7.5% by mass or less.

[0135] When the hair dye composition contains an oxidation dye, the composition containing the oxidizing agent (second agent) is stored separately from the composition containing the oxidation dye (first agent), and they are mixed before immersing the human hair fibers. Suitable oxidizing agents include, but are not limited to, hydrogen peroxide, urea peroxide, melamine peroxide, and sodium bromate. Among these oxidizing agents, hydrogen peroxide is preferred.

[0136] The content of the oxidizing agent in the hair dye composition is preferably 1% by mass or more, more preferably 2% by mass or more, and is preferably 15% by mass or less, more preferably 12% by mass or less, and even more preferably 9% by mass or less.

[0137] When the first and second agents are stored separately, the pH of the second agent at 25°C is preferably 2 or higher, more preferably 2.5 or higher, and preferably 6 or lower, more preferably 4 or lower. This pH can be adjusted with a suitable buffer. The pH of the hair dye composition obtained by mixing the first and second agents at 25°C is preferably 6 or higher, more preferably 6.5 or higher, even more preferably 6.8 or higher, and preferably 11 or lower, more preferably 10.5 or lower, even more preferably 10 or lower.

[0138] When the hair dye composition contains an oxidation dye, it may further contain a direct dye as exemplified above.

[0139] The hair dye composition may preferably further contain surfactants, conditioning ingredients, etc., as described below, and may preferably take the form of a solution, emulsion, cream, paste, or mousse.

[0140] The temperature of the hair dye composition is preferably 0°C or higher, more preferably 10°C or higher, and even more preferably 20°C or higher, from the viewpoint of efficiently penetrating and diffusing the hair dye composition into the interior of human hair fibers and further enhancing the hair dyeing effect, and is preferably 90°C or lower, and more preferably 80°C or lower.

[0141] (surface finishing for hydrophobicity and low friction) Surface finishing for imparting hydrophobicity and reducing friction is carried out by immersing the human hair fibers in the surface finishing agent (II) shown below at a stage after the above-mentioned steps (i) to (iii), or at a stage after step (iv) if a post-treatment with a crosslinking agent is carried out in step (iv), or at a stage after step (v) if a surface finishing for improving the feel in step (v).

[0142] The surface finishing agent (II) contains the following components (G) and (C). (G) An epoxyaminosilane copolymer which is a reaction product of the following compounds (a) to (d): (a) Polysiloxanes containing at least two oxiranyl or oxetanyl groups (b) Polyethers containing at least two oxiranyl or oxetanyl groups (c) Aminopropyltrialkoxysilane (d) Compounds selected from the group consisting of the following primary and secondary amines: Primary amines: methylamine, ethylamine, propyleneamine, ethanolamine, isopropylamine, butylamine, isobutylamine, hexylamine, dodecylamine, oleylamine, aniline, aminopropyltrimethylsilane, aminopropyltriethylsilane, aminomorpholine, aminopropyldiethylamine, benzylamine, naphthylamine, 3-amino-9-ethylcarbazole, 1-aminoheptafluorohexane, 2,2,3,3,4,4,5,5,6,6,7,7,8,8,8-pentadecafluoro-1-octanamine Secondary amines: methylethylamine, methyloctadecylamine, diethanolamine, dibenzylamine, dihexylamine, dicyclohexylamine, piperidine, pyrrolidine phthalimide, polymeric amines (C) Water

[0143] [Component (G): Epoxyaminosilane copolymer] The epoxy amino silane copolymer of component (G) is a reaction product of the following compounds (a) to (d).

[0144] <Compounds (a), (b)> The compound (a) is a polysiloxane containing at least two oxiranyl or oxetanyl groups, and examples thereof include those represented by the following general formula (5).

[0145] [ka]

[0146] [In the formula, R represents a hydrocarbon group having 1 to 6 carbon atoms and optionally containing a heteroatom, which has an oxiranyl group or an oxetanyl group at its terminal, and x represents a number from 1 to 1,000.]

[0147] The compound (b) is a polyether containing at least two oxiranyl or oxetanyl groups, and examples thereof include those represented by the following general formula (6).

[0148] [ka]

[0149] (In the formula, R has the same meaning as above, y is a number of 1 to 100, z is a number of 0 to 100, and y+z is a number of 1 to 200.)

[0150] In general formulas (5) and (6), the heteroatom that may be contained in R is preferably an oxygen atom. Examples of R include an oxiranylmethyl group (glycidyl group), an oxiranylmethoxy group (glycidyloxy group), an oxiranylmethoxypropyl group (glycidyloxypropyl group), an oxetanylmethyl group, an oxetanylmethoxy group, an oxetanylmethoxypropyl group, and a 3-ethyloxetanylmethyl group. Among these, a hydrocarbon group having 1 to 4 carbon atoms and optionally containing a heterooxygen atom, which has an oxiranyl group, is preferred, and at least one selected from an oxiranylmethyl group (glycidyl group), an oxiranylmethoxy group (glycidyloxy group), and an oxiranylmethoxypropyl group (glycidyloxypropyl group) is more preferred.

[0151] <Compound (c)> Compound (c) is an aminopropyltrialkoxysilane. The alkoxy group in compound (c) may have 1 to 6 carbon atoms, preferably 2 to 4 carbon atoms, and more preferably 3 carbon atoms, with an isopropoxy group being preferred. Examples of compound (c) include aminopropyltrimethoxysilane, aminopropyltriethoxysilane, aminopropyltripropoxysilane, aminopropyltriisopropoxysilane, aminopropyltributoxysilane, and aminopropyltritert-butoxysilane, with aminopropyltriisopropoxysilane being preferred. Compound (c) may be used either alone or in combination of two or more.

[0152] <Compound (d)> Compound (d) is a compound selected from the group consisting of the following primary and secondary amines: Primary amines: methylamine, ethylamine, propyleneamine, ethanolamine, isopropylamine, butylamine, isobutylamine, hexylamine, dodecylamine, oleylamine, aniline, aminopropyltrimethylsilane, aminopropyltriethylsilane, aminomorpholine, aminoethyldimethylamine, aminoethyldiethylamine, aminoethyldibutylamine, aminopropyldimethylamine, aminopropyldiethylamine, aminopropyldibutylamine, benzylamine, naphthylamine, 3-amino-9-ethylcarbazole, 1-aminoheptafluorohexane, 2,2,3,3,4,4,5,5,6,6,7,7,8,8,8-pentadecafluoro-1-octaneamine Secondary amines: methylethylamine, methyloctadecylamine, diethanolamine, dibenzylamine, dihexylamine, dicyclohexylamine, piperidine, pyrrolidine phthalimide, polymeric amines

[0153] Of these, primary amines are preferred, and one selected from aminopropyldiethylamine, aminopropyldimethylamine, and aminopropyldibutylamine is more preferred. Compound (d) can be used either alone or in combination of two or more.

[0154] The reaction of compounds (a) to (d) is carried out, for example, by refluxing in a solvent such as isopropanol for a certain period of time. Here, the molar ratio of the oxiranyl or oxetanyl groups in compounds (a) and (b) to the amino groups in compound (c) is preferably 1 or more, more preferably 1.1 or more, even more preferably 1.2 or more, and is preferably 4 or less, more preferably 3.9 or less, even more preferably 3.8 or less.

[0155] Component (G) may be one having the INCI name Polysilicone-29, and a commercially available example thereof is Silsoft CLX-E (15% active ingredient by weight, containing dipropylene glycol and water) from Momentive Performance Materials.

[0156] The content of component (G) in the surface finishing agent (II) is preferably 0.01% by mass or more, more preferably 0.05% by mass or more, even more preferably 0.10% by mass or more, and even more preferably 0.20% by mass or more, from the viewpoint of imparting sufficient hydrophobicity to human hair fibers, and is preferably 15.00% by mass or less, more preferably 10.00% by mass or less, even more preferably 8.00% by mass or less, and even more preferably 6.00% by mass or less, from the viewpoint of not imparting a sticky feel to the hair.

[0157] [pH adjuster] The pH of the surface finishing agent (II) at 25°C is preferably in the following range from the viewpoint of increasing the reaction rate of the trialkoxysilane moiety of component (G) in the acidic or basic range. When the surface finishing agent (II) is in the acidic range, it is preferably 1.0 or more, more preferably 1.5 or more, even more preferably 2.0 or more, and preferably 5.0 or less, more preferably 4.0 or less, and even more preferably 3.5 or less. When the surface finishing agent (II) is in the basic range, it is preferably 7.0 or more, more preferably 7.5 or more, even more preferably 8.0 or more, and preferably 11.0 or less, more preferably 10.5 or less, and even more preferably 10.0 or less. To adjust the pH of the surface finishing agent (II) to the above range, the surface finishing agent (II) may contain an appropriate pH adjuster. Examples of pH adjusters that can be used include alkaline agents such as alkanolamines or salts thereof, such as monoethanolamine, isopropanolamine, 2-amino-2-methylpropanol, and 2-aminobutanol; alkanediamines or salts thereof, such as 1,3-propanediamine; carbonates, such as guanidine carbonate, sodium carbonate, potassium carbonate, sodium bicarbonate, and potassium bicarbonate; and hydroxides, such as sodium hydroxide and potassium hydroxide. Examples of acid agents that can be used include inorganic acids, such as hydrochloric acid and phosphoric acid; hydrochlorides, such as monoethanolamine hydrochloride; phosphates, such as monopotassium dihydrogen phosphate and disodium monohydrogen phosphate; and organic acids, such as lactic acid and malic acid.

[0158] The amount of surface finishing agent (II) in which the human hair fibers are immersed is preferably 2 or more, more preferably 5 or more, even more preferably 10 or more, in terms of bath ratio to the mass of the human hair fibers (mass of surface finishing agent (II) / mass of human hair fibers), and is preferably 100 or less, more preferably 50 or less, even more preferably 20 or less.

[0159] By treating human hair fibers using the above fiber treatment method, the condensate produced from components (A) and (B) is contained within the human hair fibers, and this makes it possible to produce human hair fibers for head accessories that retain the natural appearance of human hair, have excellent shape retention and tensile modulus, and highly maintain the inherent stretchability (tenacity) of human hair fibers, and head accessories can be produced using these fibers. In the present invention, examples of head accessories include hair wigs, hairpieces, weaving, hair extensions, braided hair, hair accessories, and doll hair.

[0160] With respect to the above-described embodiment, further preferred aspects of the present invention will be disclosed below.

[0161] <1> A fiber treatment agent for treating human hair fibers separated from a person's head, comprising a condensate formed from the following components (A) and (B), and component (C), and having a turbidity of 1000 NTU or less. (A): Formaldehyde or its hydrate (B): Triazine derivative represented by general formula (1)

[0162] [ka]

[0163] [In the formula, R 1 ~R 3 may be the same or different and represent a hydrogen atom, a hydroxymethylamino group, an amino group, a hydroxyl group, a halogen atom, a phenyl group, a linear or branched alkyl or alkenyl group having from 1 to 6 carbon atoms, or a linear or branched alkoxy or alkenyloxy group having from 1 to 6 carbon atoms. (C):Water

[0164] <2> The content of constituent elements derived from component (A) in the fiber treatment agent is preferably 0.1% by mass or more, more preferably 1% by mass or more, even more preferably 2.5% by mass or more, still more preferably 5% by mass or more, and is preferably 60% by mass or less, more preferably 50% by mass or less, even more preferably 40% by mass or less, still more preferably 35% by mass or less, still more preferably 30% by mass or less. <1> The fiber treatment agent according to claim 1.

[0165] <3> Component (B) is preferably at least one selected from melamine, monomethylolmelamine, dimethylolmelamine, trimethylolmelamine, benzoguanamine, acetoguanamine, 2,4-diamino-1,3,5-triazine, ammeline, and 2-chloro-4,6-diamino-1,3,5-triazine, more preferably at least one selected from melamine, monomethylolmelamine, dimethylolmelamine, and trimethylolmelamine, and even more preferably melamine. <1> or <2> The fiber treatment agent according to claim 1.

[0166] <4> The content of constituent elements derived from component (B) in the fiber treatment agent is preferably 0.1% by mass or more, more preferably 1% by mass or more, even more preferably 2.5% by mass or more, still more preferably 5% by mass or more, and is preferably 60% by mass or less, more preferably 50% by mass or less, even more preferably 40% by mass or less, still more preferably 35% by mass or less, still more preferably 30% by mass or less. <1> ~ <3> The fiber treatment agent according to any one of the preceding claims.

[0167] <5> The total content of the constituent elements derived from component (A) and the constituent elements derived from component (B) in the fiber treatment agent is preferably more than 1% by mass, more preferably 2.5% by mass or more, even more preferably 5% by mass or more, still more preferably 10% by mass or more, and is preferably 80% by mass or less, more preferably 70% by mass or less, even more preferably 60% by mass or less, still more preferably 50% by mass or less, still more preferably 40% by mass or less. <1> ~ <4> The fiber treatment agent according to any one of the preceding claims.

[0168] <6> The molar ratio (A) / (B) of the components derived from component (A) to the components derived from component (B) is preferably 0.005 or more, more preferably 0.01 or more, even more preferably 0.05 or more, even more preferably 0.1 or more, and is preferably less than 5, more preferably 4 or less, even more preferably 3 or less, even more preferably 2 or less. <1> ~ <5> The fiber treatment agent according to any one of the preceding claims.

[0169] <7> The content of the condensate formed from components (A) and (B) is preferably more than 1% by mass, more preferably 1.5% by mass or more, even more preferably 2.5% by mass or more, even more preferably 5% by mass or more, even more preferably 10% by mass or more, and is preferably 80% by mass or less, more preferably 70% by mass or less, even more preferably 60% by mass or less, even more preferably 50% by mass or less, even more preferably 40% by mass or less. <1> ~ <6> The fiber treatment agent according to any one of the preceding claims.

[0170] <8> (C) Water is used as a medium, and the content of component (C) is preferably 10% by mass or more, more preferably 20% by mass or more, even more preferably 30% by mass or more, even more preferably 40% by mass or more, and is preferably 99% by mass or less, more preferably 97% by mass or less, even more preferably 95% by mass or less, even more preferably 90% by mass or less. <1> ~ <7> The fiber treatment agent according to any one of the preceding claims.

[0171] <9> Preferably, it further contains the following component (D): <1> ~ <8> The fiber treatment agent according to any one of the preceding claims. (D): Hansen solubility parameter SP value is 16MPa 1 / 2 More than 40MPa 1 / 2 Organic compounds that are: (excluding organic salts and compounds with an aldehyde group and a molecular weight of 150 or less)

[0172] <10> Component (D) is preferably at least one selected from monohydric alcohols, dihydric alcohols, dihydric alcohol derivatives, trihydric or higher polyhydric alcohols, lactams, imidazolidinones, pyrimidinones, lactones, alkylene carbonates, and general-purpose organic solvents, more preferably at least one selected from dihydric alcohols, lactams, and imidazolidinones, and even more preferably at least one selected from diethylene glycol, triethylene glycol, N-methylpyrrolidone, 1,3-dimethyl-2-imidazolidinone, and DMDM ​​hydantoin; <9> The fiber treatment agent according to claim 1.

[0173] <11> The SP value of the Hansen solubility parameter of component (D) is preferably 35.8 MPa. 1 / 2 Less than or equal to 34.7 MPa, preferably 34.7 MPa 1 / 2 or less, more preferably 29.2 MPa 1 / 2 and preferably 17.8 MPa or less. 1 / 2 More preferably, 21.1 MPa 1 / 2 More preferably, 22.0 MPa 1 / 2 That's all. <9> or <10> The fiber treatment agent according to claim 1.

[0174] <12> Preferably, it further contains a cationic surfactant. <1> ~ <11> The fiber treatment agent according to any one of the preceding claims.

[0175] <13> The cationic surfactant is preferably a mono-long-chain alkyl quaternary ammonium salt having one alkyl group having 8 to 24 carbon atoms and three alkyl groups having 1 to 4 carbon atoms, more preferably a mono-long-chain alkyl quaternary ammonium salt having one alkyl group having 8 to 24 carbon atoms and three alkyl groups having 1 to 4 carbon atoms,

[0176] [ka]

[0177] [In the formula, R 4 is a saturated or unsaturated, straight-chain or branched alkyl group having 8 to 22 carbon atoms; R 8 -CO-NH-(CH2) m -or R 8 -CO-O-(CH2) m -(R 8 represents a saturated or unsaturated, linear or branched alkyl chain having 7 to 21 carbon atoms, and m represents an integer of 1 to 4, and R 5 , R 6 and R 7 each independently represents an alkyl group having 1 to 4 carbon atoms or a hydroxylalkyl group having 1 to 4 carbon atoms; X - represents a chloride ion, a bromide ion, a methosulfate ion, or an ethosulfate ion. and more preferably at least one selected from cetyltrimethylammonium chloride, myristyltrimethylammonium chloride, behentrimonium chloride, cetyltrimethylammonium bromide, and stearamidopropyltrimonium chloride. <12> The fiber treatment agent according to claim 1.

[0178] <14> The content of the cationic surfactant is preferably 0.05% by mass or more, more preferably 0.10% by mass or more, and is preferably 10% by mass or less, more preferably 5% by mass or less. <12> or <13> The fiber treatment agent according to claim 1.

[0179] <15> Preferably, the composition further contains silicone, more preferably one or more selected from dimethylpolysiloxane and amino-modified silicone. <1> ~ <14> The fiber treatment agent according to any one of the preceding claims.

[0180] <16> The silicone content is preferably 0.1% by mass or more, more preferably 0.2% by mass or more, even more preferably 0.5% by mass or more, and is preferably 20% by mass or less, more preferably 10% by mass or less, even more preferably 5% by mass or less. <15> The fiber treatment agent according to claim 1.

[0181] <17> Preferably, it further contains a cationic polymer. <1> ~ <16> The fiber treatment agent according to any one of the preceding claims.

[0182] <18> The content of the cationic polymer is preferably 0.001% by mass or more, more preferably 0.01% by mass or more, and even more preferably 0.05% by mass or more, and is preferably 20% by mass or less, and more preferably 10% by mass or less. <17> The fiber treatment agent according to claim 1.

[0183] <19> The turbidity is preferably 500 NTU or less, more preferably 100 NTU or less, and even more preferably 20 NTU or less. <1> ~ <18> The fiber treatment agent according to any one of the preceding claims.

[0184] <20> The pH is preferably 6.0 or higher, more preferably 6.5 or higher, and even more preferably 7.0 or higher, and is preferably 12.0 or lower, more preferably 11.5 or lower, and even more preferably 11.0 or lower. <1> ~ <19> The fiber treatment agent according to any one of the preceding claims.

[0185] <21> A method for producing a fiber treatment agent for treating human hair fibers separated from a person's head, comprising heating a composition containing the following components (A) to (C) until the turbidity reaches 1000 NTU or less. (A): Formaldehyde or its hydrate (B): Condensation product with a triazine derivative represented by general formula (1)

[0186] [ka]

[0187] [In the formula, R 1 ~R 3 may be the same or different and represent a hydrogen atom, a hydroxymethylamino group, an amino group, a hydroxyl group, a halogen atom, a phenyl group, a linear or branched alkyl or alkenyl group having from 1 to 6 carbon atoms, or a linear or branched alkoxy or alkenyloxy group having from 1 to 6 carbon atoms. (C):Water

[0188] <22> The heating temperature is preferably 85°C or higher, more preferably 88°C or higher, and even more preferably 90°C or higher, and is preferably 120°C or lower, more preferably 115°C or lower, and even more preferably 110°C or lower. <21> A method for producing the fiber treatment agent described in

[0189] <23> The heating time is preferably 1 minute or more, more preferably 5 minutes or more, and preferably 20 minutes or less, more preferably 15 minutes or less. <21> or <22> A method for producing the fiber treatment agent described in

[0190] <24> The pH during heating is preferably 7.0 or higher, more preferably 8.0 or higher, and even more preferably 9.0 or higher, and is preferably 13.0 or lower, more preferably 12.0 or lower, and even more preferably 11.0 or lower. <21> ~ <23> 1. A method for producing the fiber treatment agent according to any one of claims 1 to 9.

[0191] <25> A fiber treatment method comprising the following step (i): (i) <1> ~ <24> a step of immersing human hair fibers separated from a person's head in the fiber treating agent according to any one of claims 1 to 4, and treating the fibers while maintaining the turbidity of the treating agent at 1000 NTU or less.

[0192] <26> Preferably, the following step (0) is carried out before step (i): <25> The fiber treatment method according to claim 1. (0) Heating the fiber treatment agent

[0193] <27> The heating time in step (0) is preferably 0.2 T or more, more preferably 0.3 T or more, even more preferably 0.4 T or more, and is also preferably 0.8 T or less, more preferably 0.7 T or less, even more preferably 0.6 T or less, where T is defined as the heating time when a treatment agent having a turbidity of 1000 NTU or less immediately after preparation is heated until the turbidity of the treatment agent exceeds 1000 NTU. <26> The fiber treatment method according to claim 1.

[0194] <28> In step (i), the amount of the fiber treatment agent into which the human hair fiber is immersed is, in terms of a bath ratio to the mass of the human hair fiber (mass of fiber treatment agent / mass of human hair fiber), preferably 2 or more, more preferably 3 or more, even more preferably 5 or more, even more preferably 10 or more, even more preferably 20 or more, and is preferably 500 or less, more preferably 250 or less, even more preferably 100 or less. <25> ~ <27> The fiber treatment method according to any one of the above.

[0195] <29> The temperature of the fiber treatment agent in step (i) is preferably 30°C or higher, more preferably 40°C or higher, even more preferably 50°C or higher, and is preferably lower than 95°C, more preferably 85°C or lower, even more preferably 75°C or lower. <25> ~ <28> The fiber treatment method according to any one of the above.

[0196] <30> The immersion time in step (i), where T is defined as the heating time when a treatment agent having a turbidity of 1000 NTU or less immediately after preparation is heated until the turbidity of the treatment agent exceeds 1000 NTU, is preferably 0.3 T or more, more preferably 0.4 T or more, even more preferably 0.45 T or more, and is preferably 0.95 T or less, more preferably 0.90 T or less, even more preferably 0.85 T or less. <25> ~ <29> The fiber treatment method according to any one of the above.

[0197] <31> Preferably, the following step (ii) is carried out after step (i), and steps (i) and (ii) are repeated two or more times: <25> ~ <30> The fiber treatment method according to any one of the above. (ii) Removing the human hair fibers from the treatment solution before the turbidity of the treatment solution exceeds 1,000 NTU.

[0198] <32> Preferably, step (ii) is followed by the following step (iii): <31> The fiber treatment method according to claim 1. (iii) Rinse the extracted human hair fibers.

[0199] <33> Preferably, the rinsing in step (iii) is carried out using a rinsing composition containing component (D). <32> The fiber treatment method according to claim 1. (D): Hansen solubility parameter SP value is 16MPa 1 / 2 More than 40MPa 1 / 2 Organic compounds that are: (excluding organic salts and compounds with an aldehyde group and a molecular weight of 150 or less)

[0200] <34> The rinse composition contains water in addition to the component (D), and the content of the component (D) in the rinse composition is preferably 60% by mass or more, more preferably 80% by mass or more, and even more preferably 95% by mass or more. <33> The fiber treatment method according to claim 1.

[0201] <35> Preferably, after steps (i) to (iii), the following step (iv) is further carried out: <25> ~ <34> The fiber treatment method according to any one of the above. (iv) immersing the human hair fibers in a post-crosslinking agent containing components (E) and (C). (E): at least one formaldehyde derivative selected from formaldehyde, formaldehyde hydrate, glyoxylic acid, glyoxylic acid hydrate, glyoxylate, glyoxal, glyoxal hydrate, glutaraldehyde, and glutaraldehyde hydrate; (C):Water

[0202] <36> The content of component (E) in the post-crosslinking agent is preferably 0.01% by mass or more, more preferably 0.1% by mass or more, even more preferably 1% by mass or more, and is preferably 60% by mass or less, more preferably 40% by mass or less, even more preferably 20% by mass or less. <35> The fiber treatment method according to claim 1.

[0203] <37> The temperature of the post-crosslinking agent is preferably 40°C or higher, more preferably 50°C or higher, and even more preferably 60°C or higher, and is preferably lower than 100°C, and more preferably 99°C or lower. <35> or <36> The fiber treatment method according to claim 1.

[0204] <38> Preferably, after the steps (i) to (iii) or after the step (iv), the following step (v) is further carried out: <25> ~ <37> The fiber treatment method according to any one of the above. (v) immersing the human hair fibers in a surface finish (I) containing components (F) and (C). (F): Resorcinol derivative represented by general formula (2)

[0205] [ka]

[0206] [During the ceremony, A 1 ~A4 may be the same or different and represent a hydrogen atom, a hydroxyl group, a halogen atom, a carboxyl group or a salt thereof, a sulfonic acid group or a salt thereof, a linear or branched alkyl or alkenyl group having 1 to 6 carbon atoms, or a linear or branched alkoxy or alkenyloxy group having 1 to 6 carbon atoms. (C):Water

[0207] <39> The content of component (F) in the surface finishing agent (I) is preferably 10% by mass or more, more preferably 20% by mass or more, even more preferably 30% by mass or more, even more preferably 40% by mass or more, even more preferably 50% by mass or more, and is preferably 98% by mass or less, more preferably 97% by mass or less, even more preferably 95% by mass or less, even more preferably 90% by mass or less, even more preferably 80% by mass or less. <38> The fiber treatment method according to claim 1.

[0208] <40> The temperature of the surface finishing agent (I) is preferably 0°C or higher, more preferably 20°C or higher, even more preferably 40°C or higher, and is preferably 80°C or lower, more preferably 60°C or lower. <38> or <39> The fiber treatment method according to claim 1.

[0209] <41> Preferably, after steps (i) to (iii), or after step (iv), or after step (v), a step of immersing the human hair fibers in a surface finishing agent (II) containing the following components (G) and (C) is further carried out: <25> ~ <40> The fiber treatment method according to any one of the above. (G) An epoxyaminosilane copolymer which is a reaction product of the following compounds (a) to (d): (a) Polysiloxanes containing at least two oxiranyl or oxetanyl groups (b) Polyethers containing at least two oxiranyl or oxetanyl groups (c) Aminopropyltrialkoxysilane (d) Compounds selected from the group consisting of the following primary and secondary amines: Primary amines: methylamine, ethylamine, propyleneamine, ethanolamine, isopropylamine, butylamine, isobutylamine, hexylamine, dodecylamine, oleylamine, aniline, aminopropyltrimethylsilane, aminopropyltriethylsilane, aminomorpholine, aminopropyldiethylamine, benzylamine, naphthylamine, 3-amino-9-ethylcarbazole, 1-aminoheptafluorohexane, 2,2,3,3,4,4,5,5,6,6,7,7,8,8,8-pentadecafluoro-1-octanamine Secondary amines: methylethylamine, methyloctadecylamine, diethanolamine, dibenzylamine, dihexylamine, dicyclohexylamine, piperidine, pyrrolidine phthalimide, polymeric amines (C) Water

[0210] <42> Preferably, component (G) is polysilicone-29. <41> The fiber treatment method according to claim 1.

[0211] <43> The content of component (G) in the surface finishing agent (II) is preferably 0.01% by mass or more, more preferably 0.05% by mass or more, even more preferably 0.10% by mass or more, even more preferably 0.20% by mass or more, and is preferably 15.00% by mass or less, more preferably 10.00% by mass or less, even more preferably 8.00% by mass or less, even more preferably 6.00% by mass or less. <41> or <42> The fiber treatment method according to claim 1.

[0212] <44> <25> ~ <43> A method for producing human hair fibers for head accessories, comprising a step of treating human hair fibers with the fiber treatment method described in any one of the above.

[0213] <45> <25> ~ <43> A method for manufacturing a head accessory product, comprising a step of treating human hair fibers using the fiber treatment method described in any one of the above.

[0214] <46> Human hair fibers for head accessories containing a condensate formed from components (A) and (B). (A): Formaldehyde or its hydrate (B): Triazine derivative represented by general formula (1)

[0215] [ka]

[0216] [In the formula, R 1 ~R 3 may be the same or different and represent a hydrogen atom, a hydroxymethylamino group, an amino group, a hydroxyl group, a halogen atom, a phenyl group, a linear or branched alkyl or alkenyl group having from 1 to 6 carbon atoms, or a linear or branched alkoxy or alkenyloxy group having from 1 to 6 carbon atoms.

[0217] <47> A head accessory product comprising human hair fibers containing a condensate produced from components (A) and (B). (A): Formaldehyde or its hydrate (B): Triazine derivative represented by general formula (1)

[0218] [ka]

[0219] [In the formula, R 1 ~R 3 may be the same or different and represent a hydrogen atom, a hydroxymethylamino group, an amino group, a hydroxyl group, a halogen atom, a phenyl group, a linear or branched alkyl or alkenyl group having from 1 to 6 carbon atoms, or a linear or branched alkoxy or alkenyloxy group having from 1 to 6 carbon atoms.

[0220] <48> > A human hair fiber treatment agent containing the following components (A) to (C): (A) Formaldehyde 1 to 15% by mass (B) 5 to 30% by mass of one or more selected from melamine, monomethylolmelamine, dimethylolmelamine, and trimethylolmelamine (C) Water

[0221] <49> Further containing the following component (D): <48> The human hair fiber treatment agent according to claim 1. (D) 15 to 45% by mass of one or more selected from diethylene glycol, triethylene glycol, N-methylpyrrolidone, 1,3-dimethyl-2-imidazolidinone, and DMDM ​​hydantoin

[0222] <50> <48> or <49> and a post-crosslinking agent containing components (E) and (C) and having a pH of 1.0 to 4.5. (E) 1 to 20% by mass of glyoxylic acid or formaldehyde (C) Water remaining

[0223] <51> Preferably, it further comprises a surface finish (II) containing components (G) and (C), <50> The human hair fiber treatment kit according to claim 1. (G) Polysilicone-29 0.1 to 15 mass% (C) Water remaining

[0224] <52> <48> or <49> A human hair fiber treatment kit comprising the human hair fiber treatment agent described in 1 above and a surface finishing agent (II) containing components (G) and (C). (G) Polysilicone-29 0.1 to 15 mass% (C) Water remaining [Example]

[0225] Examples 1 to 10, Comparative Example 1 Human hair fibers were treated according to the following methods using the compositions formulated as shown in Tables 1 and 2, and various evaluations were performed. The pH of each composition was measured directly at room temperature (25°C) using a pH meter (HORIBA, F-52). The turbidity of the composition was measured at room temperature (25°C) by placing the fiber treatment agent directly into a measuring cell (φ25 x 60 mm borosilicate glass) of a digital turbidity meter (AS ONE Corporation / Model: TB700 / Measurement method: ISO 7027 nephelometry (90°C) compliant / Light source: Infrared emitting diode (850 nm) / Detector: Crystalline silicon solar cell module).

[0226] <Processing method> 1. A 0.5g bundle of human hair fiber (cut from a commercially available 100% human hair wig) measuring 22cm in length was immersed in a container containing 40g of fiber treatment agent, the container was sealed, and the container was immersed in a water bath (manufacturer: Toyo Seisakusho Co., Ltd. / model number: TBS221FA) at a specified temperature and heated for a specified period of time. The heating time (step (i)) was standardized to a time equivalent to approximately 0.45T (T is as described above). In Examples 6 and 7, heating (step (0)) was also performed for a time equivalent to about 0.30 T before the above step 1. 2. The container containing the hair bundle was removed from the water bath and allowed to return to room temperature. 3. The hair bundle was removed from the container and immersed in 50 g of triethylene glycol for 30 seconds, then rinsed with running tap water at 30°C for 30 seconds, lathered with the evaluation shampoo for 60 seconds, rinsed with running tap water at 30°C for 30 seconds, lightly dried with a towel, and then combed and dried with a hot air dryer (Tescom Co., Ltd., Nobby White NB3000). At this point, the hair bundle remained straight.

[0227] <Post-crosslinking treatment> (Example 7 only) 4. The hair bundle that had been treated as described above was immersed in a container containing 40 g of a post-crosslinking agent, the container was sealed, and the container was immersed in a water bath (manufacturer: Toyo Seisakusho Co., Ltd. / model number: TBS221FA) at a specified temperature and heated for a specified period of time. 5. The container containing the hair bundle was removed from the water bath and allowed to return to room temperature. 6. The hair bundle was removed from the container, rinsed with running tap water at 30°C for 30 seconds, lathered with the evaluation shampoo for 60 seconds, rinsed with running tap water at 30°C for 30 seconds, lightly dried with a towel, and then combed with a hot air dryer (Tescom Co., Ltd., Nobby White NB3000). At this point, the hair bundle remained straight.

[0228] [Evaluation method] <Maintaining elasticity (tenacity) when stretching fibers> As an index of the stretchability (tenacity) of the fiber when stretched, the average breaking elongation, i.e., the percentage of the original fiber length at which the fiber breaks when stretched by tension, was evaluated for multiple (10) fibers and the average value was used. The evaluation was carried out using the hair bundle immediately after being treated with the above-mentioned <Treatment method> (<Treatment method> and <Post-crosslinking treatment> for Example 7) according to the following procedure. 1. Ten fibers were cut from the base of the hair bundle. 3cm pieces were taken from the middle of each fiber between the base and the tip, for a total of 10 3cm hair pieces. These hair pieces were left to stand in a room at 20°C and 65% RH for at least 12 hours. 2. The fiber pieces were placed in the "MTT690 Automatic Fiber Tensile Tester" manufactured by DIA-STRON Limited, and automatic measurement was started to determine the average breaking elongation of the fiber in a dry state. The higher the value, the higher the elasticity, tenacity, and durability.

[0229] (Evaluation criteria) The difference in stretchability (tenacity) when the fiber was pulled compared to the untreated hair of Comparative Example 1 is shown in the table as X (%). The value of X can be either positive or negative. When X is positive, the larger the value of X, and when X is negative, the smaller the absolute value of X, the higher the stretchability, tenacity, and durability. In other words, the average breaking elongation (A%) of the fibers when pulled in the untreated state (cut from a commercially available product) was used as the standard, and the degree to which the average breaking elongation (B%) of the treated hair bundle decreased (X%) from the untreated state was recorded in the table as "Reduction in elasticity (tenacity) when pulling the fibers X (%)." X(%)=B(%)-A(%)

[0230] <Achieving fiber tensile modulus close to that of healthy hair> The evaluation of fiber tensile modulus was carried out using a hair bundle immediately after treatment using the above-mentioned <treatment method>. The numerical value was the average value when evaluating multiple fibers (10 fibers). The evaluation was carried out according to the following procedure. 1. Ten fibers were cut from the base of the hair bundle. 3cm pieces were taken from the middle of each fiber between the base and the tip, for a total of 10 3cm hair pieces. These hair pieces were left to stand in a room at 20°C and 65% RH for at least 12 hours. 2. The fiber piece was set in the "MTT690 Automatic Fiber Tensile Tester" manufactured by DIA-STRON Limited, and automatic measurement was started to determine the fiber tensile modulus in a dry state. 3. When the fiber tensile modulus obtained in step 2 above is defined as E1, and the fiber tensile modulus obtained in the same manner for healthy hair (*) is defined as E0, the index of fiber tensile elasticity is: Fiber tensile elasticity normalization rate E = (E1 / E0) x 100 [%] The closer the value of E is to 100%, the healthier the fiber is, with natural firmness, resistance to stretching due to external forces, and excellent durability. * For healthy hair, 10 strands of hair with 30cm of roots taken from a 20-year-old Japanese woman who had never been chemically treated were used, and fiber pieces were taken and measured in the same manner as above. On the other hand, as shown in Comparative Example 1, the elastic modulus of the human hair fiber (untreated hair) used this time was lower than that of healthy hair, but this is thought to be because it was taken from a commercially available wig and was already damaged.

[0231] <Shaping> The thermal shape memory ability was evaluated using a hair bundle immediately after being treated with the above-mentioned <Treatment Method> (<Treatment Method> and <Post-Crosslinking Treatment> for Example 7). I: Shaping (curl) 1. A 22 cm long bundle of 0.5 g human hair fiber was wetted with 30°C tap water for 30 seconds, and then the wet bundle was wrapped around a 14 mm diameter plastic rod and secured with a clip. 2. The hair bundle wrapped around the rod was immersed in a 60°C water bath (manufacturer: Toyo Seisakusho Co., Ltd. / model number: TBS221FA) and heated for 1 minute. 3. The hair bundle was removed from the water bath, immersed in water at 25°C for 1 minute, and then returned to room temperature. 4. The hair bundle was removed from the rod, combed through three times, then hung up and photographed from the side.

[0232] (Evaluation criteria) The untreated hair bundle length was L0 (22 cm) and the treated hair bundle length was L. The curl strength was defined as the curl-up rate = hair bundle length reduction rate (I) (%) calculated according to the following formula. I = [(L0-L) / L0] × 100 A:20≦I B:15≦I<20 C:10 ≦ I < 15 D:5 ≦ I < 10 E:I < 5

[0233] II: Reshaping (straight) 1. The hair bundle evaluated in I was combed to remove tangles, and then slid six times at a speed of 5 cm / sec with a flat iron (manufactured by Miki Electric Industrial Co., Ltd. / model number: AHI-938) at an actual temperature of 180°C. 2. Rinse with running tap water at 30°C for 30 seconds, lather with the evaluation shampoo for 60 seconds, then rinse with running tap water at 30°C for 30 seconds and towel dry. 3. The hair was dried while vibrating (without using a hair dryer) to bring out the natural shape of the human hair fibers, then combed through, hung up and visually observed from the side.

[0234] (Evaluation Criteria) A: No curl remains and the hair is completely straight. B: The curl is weaker than before flat ironing, but the hair is not completely straight. C: The hair remains curly with no change in shape from before treatment.

[0235] <III: Re - reshaping (curl)>[ 1. After wetting the hair bundle evaluated in II with tap water at 30°C for 30 seconds, the wet hair bundle was wrapped around a plastic rod with a diameter of 14 mm and fixed with a clip. 2. The hair bundle wrapped around the rod was immersed in a water bath at 60°C (manufacturer: Toyo Seisakusho Co., Ltd. / model number: TBS221FA) and heated for 1 minute. 3. The hair bundle was taken out of the water bath, immersed in water at 25°C for 1 minute, and then returned to room temperature. 4. The hair bundle was removed from the rod, combed through 3 times with a comb, and then hung and photographed from the side.

[0236] (Evaluation Criteria) Taking the length of the untreated hair bundle as L0 (22 cm) and the length of the treated hair bundle as L, the curl - up rate = the reduction rate of the hair bundle length (I) (%) obtained according to the following formula was defined as the curling strength. I = [(L0 - L) / L0]×100 A: 20 ≤ I B: 15 ≤ I < 20 C: 10 ≤ I < 15 D: 5 ≤ I < 10 E: I < 5

[0237] <Shampoo formulation for evaluation>[ Ingredients (mass%) Sodium lauryl sulfate 15.5 Lauramide DEA 1.5 Sodium benzoate 0.5 EDTA - 2Na 0.3 Phosphoric acid Amount adjusted to pH 7 Ion exchange water balance Total 100

[0238] <Good surface feel> The feel of the hair was evaluated by five expert panelists using the hair bundles immediately after the evaluation of shape retention, and the smoothness of the feel when touched with the hand was evaluated according to the following criteria, with the total value of the five panelists being the evaluation result. (Evaluation criteria) 5: Extremely smooth to the touch compared to untreated fibers 4: Smoother to the touch than untreated fibers 3: Slightly smoother to the touch than untreated fibers 2: The feel is the same as untreated fibers 1: Rougher and squeakier than untreated fibers, and has an inferior feel

[0239] [Table 1]

[0240] [Table 2]

[0241] Example 11, Comparative Example 2 Table 3 shows an example in which, in "1" of the above-mentioned <Treatment Method>, steps (i) and (ii) were repeated multiple times so that the turbidity of the composition would not exceed 1000 NTU, and a comparative example in which heating was continued even after the turbidity of the composition exceeded 1000 NTU during step (i). In Example 11, human hair fiber treatment was carried out in the same manner as in the above <Treatment Method>, except that in step (i), the human hair fiber was removed before the turbidity of the composition exceeded 1000 NTU, and then the composition was replaced with a new, similar composition and subjected to the same heat treatment, and the human hair fiber was removed before the turbidity of the composition exceeded 1000 NTU (a total of two heat treatments were carried out). In Comparative Example 2, human hair fiber treatment was carried out in the same manner as in the above <Treatment Method>, except that in step (i), heating was continued while the composition remained cloudy even after the turbidity of the composition exceeded 1000 NTU.

[0242] [Table 3]

[0243] In Comparative Example 2, the loss in elasticity (tenacity) when the fiber was pulled was -21.4, and the surface feel was 8, which was inferior to Example 11. In addition, the fiber tensile elasticity normalization rate was 112, which is significantly different from the most preferable value of 100, which indicates that the formation of a hard resin layer on the surface made the hair too hard compared to healthy hair.

[0244] Example 12 (Surface Finishing Treatment) The human hair fibers treated in Example 4 were treated with the surface finishing agents shown in Table 4, and various evaluations were carried out.

[0245] <Processing method> 1. A hair bundle was immersed in a container containing 40 g of surface finishing agent and left to stand at room temperature for 30 minutes. 2. The hair bundle was removed from the container and dehydrated for 5 minutes using a household centrifugal dehydrator (ultra-high speed dehydrator Powerful Spin Dry APD-6.0 / Almis Co., Ltd.) (spin coating method). 3. The hair bundle was removed from the dehydrator and heated in an oven set to 60°C (forced convection dryer with stainless steel window; AS ONE Corporation, SOFW-450) for 3 hours. 4. The hair tresses were removed from the oven and allowed to return to room temperature. 5. The hair bundle was rinsed for 30 seconds under running water at 30°C, lightly dried with a towel, and then dried by combing with a hot air dryer (Tescom Co., Ltd., Nobby White NB3000).

[0246] [Table 4]

Claims

1. A fiber treatment agent for treating human hair fibers separated from a human head, comprising a condensate produced from the following components (A) and (B), and component (C), and having a turbidity of 1000 NTU or less. (A): Formaldehyde or its hydrate (B): Triazine or its derivative represented by the general formula (1) 【Chemistry 1】 [In the formula, R 1 ~R 3 may be the same or different and represent a hydrogen atom, a hydroxymethylamino group, an amino group, a hydroxyl group, a halogen atom, a phenyl group, a linear or branched alkyl or alkenyl group having from 1 to 6 carbon atoms, or a linear or branched alkoxy or alkenyloxy group having from 1 to 6 carbon atoms. (C):Water

2. 2. The fiber treating agent according to claim 1, wherein the content of the constituent elements derived from component (A) in the fiber treating agent is 0.1% by mass or more and 60% by mass or less.

3. 3. The fiber treating agent according to claim 1, wherein the content of the constituent elements derived from component (B) in the fiber treating agent is 0.1% by mass or more and 60% by mass or less.

4. The fiber treatment agent according to any one of claims 1 to 3, wherein the total content of the components derived from component (A) and the components derived from component (B) in the fiber treatment agent is 0.1 mass% or more and 80 mass% or less.

5. The fiber treatment agent according to any one of claims 1 to 4, wherein the molar ratio (A) / (B) of the components derived from component (A) to the components derived from component (B) is less than 5.

6. The fiber treatment agent according to any one of claims 1 to 5, further comprising the following component (D): (D): Hansen solubility parameter SP value is 16MPa 1 / 2 More than 40MPa 1 / 2 Organic compounds that are:

7. A method for producing a fiber treatment agent for treating human hair fibers separated from a human head, comprising heating a composition containing the following components (A) to (C) until the turbidity becomes 1000 NTU or less. (A): Formaldehyde or its hydrate (B): A condensation product of triazine or its derivative represented by the general formula (1) 【Chemistry 2】 [In the formula, R 1 ~R 3 may be the same or different and represent a hydrogen atom, a hydroxymethylamino group, an amino group, a hydroxyl group, a halogen atom, a phenyl group, a linear or branched alkyl or alkenyl group having from 1 to 6 carbon atoms, or a linear or branched alkoxy or alkenyloxy group having from 1 to 6 carbon atoms. (C):Water

8. A method for treating fibers, comprising the following step (i): (i) A step of immersing human hair fibers separated from a person's head in the fiber treating agent according to any one of claims 1 to 6 and treating the fibers while maintaining the turbidity of the treating agent at 1000 NTU or less.

9. The method for treating fibers according to claim 8, further comprising the step (0) below being carried out prior to the step (i). (0) A process for heating the fiber treatment agent

10. 10. The fiber treatment method according to claim 9, wherein the heating time in step (0) is 0.2T to 0.8T, where T is defined as the heating time from when the treatment agent having a turbidity of 1000 NTU or less immediately after preparation is heated until the turbidity of the treatment agent again exceeds 1000 NTU.

11. The method for treating fibers according to any one of claims 8 to 10, wherein a combination of step (i) and the following step (ii) is carried out one or more times: (ii) Removing the human hair fibers from the treatment before the turbidity of the treatment exceeds 1,000 NTU.

12. 12. The method for treating fibers according to claim 11, further comprising the step (iii) below, optionally after the step (ii). (iii) Rinse the removed human hair fibers.

13. 13. The method of claim 12, wherein the rinsing in step (iii) is carried out with a composition containing component (D). (D): Hansen solubility parameter SP value is 16MPa 1 / 2 More than 40MPa 1 / 2 Organic compounds that are:

14. The method for treating fibers according to any one of claims 8 to 13, further comprising carrying out the following step (iv) after steps (i) to (iii): (iv) immersing the human hair fibers in a post-crosslinking agent containing components (E) and (C). (E): at least one formaldehyde derivative selected from formaldehyde hydrate, glyoxylic acid, glyoxylic acid hydrate, glyoxylate, glyoxal, glyoxal hydrate, glutaraldehyde, and glutaraldehyde hydrate; (C):Water

15. A fiber treatment method according to any one of claims 8 to 14, further comprising carrying out one or more treatments selected from bleaching and dyeing before or after steps (i) to (iv), or between each of steps (i) to (iv).

16. The fiber treatment method according to any one of claims 8 to 15, further comprising, after steps (i) to (iii) or step (iv), a step of immersing the human hair fiber in a surface finishing agent containing the following components (G) and (C): (G) An epoxyaminosilane copolymer which is a reaction product of the following compounds (a) to (d): (a) A polysiloxane having at least two oxiranyl or oxetanyl groups. (b) Polyethers containing at least two oxiranyl or oxetanyl groups. (c) Aminopropyltrialkoxysilane (d) Compounds selected from the group consisting of primary and secondary amines: Primary amines: methylamine, ethylamine, propyleneamine, ethanolamine, isopropylamine, butylamine, isobutylamine, hexylamine, dodecylamine, oleylamine, aniline, aminopropyltrimethylsilane, aminopropyltriethylsilane, aminomorpholine, aminopropyldiethylamine, benzylamine, naphthylamine, 3-amino-9-ethylcarbazole, 1-aminoheptafluorohexane, 2,2,3,3,4,4,5,5,6,6,7,7,8,8,8-pentadecafluoro-1-octanamine Secondary amines: methylethylamine, methyloctadecylamine, diethanolamine, dibenzylamine, dihexylamine, dicyclohexylamine, piperidine, pyrrolidine, phthalimide, polymeric amines (C) Water

17. A method for producing human hair fibers for head accessories, comprising a step of treating human hair fibers by the fiber treatment method according to any one of claims 8 to 16.

18. A method for producing a head accessory product, comprising a step of treating human hair fibers with the fiber treatment method according to any one of claims 8 to 16.

19. A human hair fiber for head accessories, comprising a condensate produced from components (A) and (B). (A): Formaldehyde or its hydrate (B): Triazine or its derivative represented by the general formula (1) 【Chemistry 3】 [In the formula, R 1 ~R 3 may be the same or different and represent a hydrogen atom, a hydroxymethylamino group, an amino group, a hydroxyl group, a halogen atom, a phenyl group, a linear or branched alkyl or alkenyl group having from 1 to 6 carbon atoms, or a linear or branched alkoxy or alkenyloxy group having from 1 to 6 carbon atoms.

20. A head accessory product comprising human hair fibers as a component, the fibers containing a condensate produced from components (A) and (B). (A): Formaldehyde or its hydrate (B): Triazine or its derivative represented by the general formula (1) 【Chemistry 4】 [In the formula, R 1 ~R 3 may be the same or different and represent a hydrogen atom, a hydroxymethylamino group, an amino group, a hydroxyl group, a halogen atom, a phenyl group, a linear or branched alkyl or alkenyl group having from 1 to 6 carbon atoms, or a linear or branched alkoxy or alkenyloxy group having from 1 to 6 carbon atoms.

21. The head accessory product according to claim 20, which is selected from a hair wig, a toupee, a weaving, a hair extension, a braided hair, a hair accessory, and a doll hair.

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