Hair cosmetics

Abstract

To provide a hair cosmetic that repairs a crystal structure formed by α-keratin, and improves a resilience feeling and ease of fingers to run through in damaged hair.SOLUTION: A hair cosmetic comprises at least one component (I) selected from trimethylglycine (A) and glycine (B), and water (C).SELECTED DRAWING: None

Description

[Technical Field]

[0001] The present invention relates to a hair cosmetic composition. [Background technology]

[0002] Hair is damaged daily by brushing, shampooing, blow-drying, etc. Hair is also damaged by chemical treatments such as perming, straightening, dyeing, and bleaching. Damaged hair not only loses physical properties such as strength and smoothness, but also causes the elution of gamma-keratin, a hydrophilic matrix protein in the hair cortex.

[0003] When gamma-keratin is eluted from hair, it changes the crystalline structure formed by alpha-keratin, a hydrophobic crystalline protein. Hair with an altered crystalline structure formed by alpha-keratin becomes less elastic and more brittle.

[0004] For example, Non-Patent Document 1 describes the use of betaine to repair damage to hair (Non-Patent Document 1, page 75). It has been reported that hair treated with betaine shows an improvement in the peeling condition at the tip of the hair cuticle. It has also been reported that betaine adsorbs to the surface of the hair cuticle and acts as a highly hydrophilic protective film, while also penetrating and diffusing into the cortex, adsorbing to keratin protein with its strong affinity and functioning as a substitute for lost gamma-keratin.

[0005] Patent Document 1 discloses the use of betaine to increase and / or maintain the elasticity of chemically treated hair. It also discloses the use of betaine to protect hair against chemical damage. The effect of betaine on hair elasticity was investigated by measuring the tensile strength of hair (Patent Document 1

[0010] ), and it is disclosed that betaine is effective in strengthening hair. [Prior art documents] [Non-patent literature]

[0006] [Non-Patent Document 1] Fragrance Journal, February 1991, pages 70-77 [Patent documents]

[0007] [Patent Document 1] Japanese Patent Application Laid-Open No. 2002-326912 Summary of the Invention [Problem to be solved by the invention]

[0008] However, although the report in Non-Patent Document 1 confirmed the effect of betaine in repairing damage to hair, there was no investigation or evaluation of the repair of the crystalline structure formed by α-keratin.

[0009] In addition, the technology of Patent Document 1 measures the tensile strength of hair, but this test is thought to mainly measure the stress in the matrix region formed by γ-keratin in the cortex, and not to measure the stress resulting from the crystalline structure formed by α-keratin. In other words, there was no study on the restoration of the crystalline structure formed by α-keratin. Therefore, an object of the present invention is to provide a hair cosmetic that repairs the crystalline structure formed by α-keratin and improves the elasticity and ease of running fingers through damaged hair. [Means for solving the problem]

[0010] The present inventors have conducted extensive research to solve the above problems, and as a result have found that a hair cosmetic composition having the following composition can solve the above problems, thereby completing the present invention. The present invention includes, for example, the following [1] to [9].

[0011] [1] A hair care product comprising at least one component (I) selected from trimethylglycine (A) and glycine (B), and water (C), wherein when the component (I) contains trimethylglycine (A) but does not contain glycine (B), the component contains trimethylglycine (A) in a range of 20 to 60% by mass, and the mass ratio (A:C) of the trimethylglycine (A) to the water (C) is 1:5 to 3:2; when the component (I) does not contain trimethylglycine (A) but contains glycine (B), the component contains glycine (B) in a range of 10 to 20% by mass, and the mass ratio (B:C) of the glycine (B) to the water (C) is 1:9 to 1:4; and when the component (I) contains trimethylglycine (A) and glycine (B), the hair care product satisfies any of the following conditions (i) to (iii): Hair cosmetics: (i) When the amount of trimethylglycine (A) is higher than the amount of glycine (B), the hair cosmetics contain 20 to 60% by mass of trimethylglycine (A), and the total mass of the trimethylglycine (A) and the glycine (B) is in the range of more than 20% by mass and not more than 61% by mass; (ii) When the amount of glycine (B) is higher than the amount of trimethylglycine (A), the hair cosmetics contain 10 to 20% by mass of glycine (B), and the total mass of the trimethylglycine (A) and the glycine (B) is in the range of more than 10% by mass and not more than 21% by mass; (iii) When the amount of trimethylglycine (A) and the amount of glycine (B) are the same, the total mass of the trimethylglycine (A) and the glycine (B) is in the range of 20 to 30% by mass.

[0012] [2] When trimethylglycine (A) and glycine (B) are contained as the component (I), the hair cosmetic composition according to [1] satisfies the following condition (i): (i) when the amount of trimethylglycine (A) is greater than the amount of glycine (B), the trimethylglycine (A) is contained in the range of 40 to 60% by mass, and the total mass of the trimethylglycine (A) and the glycine (B) is in the range of more than 40% by mass but not more than 61% by mass.

[0013] [3] The hair cosmetic composition according to [1] or [2], which is a transparent liquid. [4] The hair cosmetic composition according to any one of [1] to [3], which is used on hair that has been permed, straightened, bleached, or colored.

[0014] [5] A hair cosmetic composition according to any one of [1] to [4], which is used as a rinse-off treatment. [6] The hair cosmetic composition according to any one of [1] to [5], which has a pH of 4 to 9.

[0015] [7] The hair cosmetic composition according to any one of [1] to [6], which is applied to hair in the form of a lotion or mist. [8] The hair cosmetic composition according to any one of [1] to [7], which is in a non-emulsified form. [9] The hair cosmetic composition according to any one of [1] to [8], which is used to repair the crystalline structure formed by α-keratin. [Effects of the Invention]

[0016] The present invention can provide a hair cosmetic that repairs the crystalline structure formed by α-keratin and improves the elasticity and smoothness of damaged hair. DETAILED DESCRIPTION OF THE INVENTION

[0017] Next, the hair cosmetic composition of the present invention will be specifically described.

[0018] <Hair cosmetics> The hair cosmetic composition of the present invention comprises at least one component (I) selected from trimethylglycine (A) and glycine (B), and water (C). When the component (I) contains trimethylglycine (A) but not glycine (B), the component contains 20 to 60% by mass of trimethylglycine (A), and the mass ratio (A:C) of the trimethylglycine (A) to the water (C) is 1:5 to 3:2. When the component (I) does not contain trimethylglycine (A) but contains glycine (B), the component (I) contains 10 to 20% by mass of glycine (B), and the mass ratio (B:C) of the glycine (B) to the water (C) is 1:9 to 1:4. When the component (I) contains trimethylglycine (A) and glycine (B), the component (I) satisfies any one of the following conditions (i) to (iii): The conditions are satisfied: (i) when the amount of trimethylglycine (A) is higher than the amount of glycine (B), the trimethylglycine (A) is contained in a range of 20 to 60% by mass, and the total mass of the trimethylglycine (A) and the glycine (B) is in the range of more than 20% by mass and not more than 61% by mass; (ii) when the amount of glycine (B) is higher than the amount of trimethylglycine (A), the glycine (B) is contained in a range of 10 to 20% by mass, and the total mass of the trimethylglycine (A) and the glycine (B) is in the range of more than 10% by mass and not more than 21% by mass; (iii) when the amount of trimethylglycine (A) and the amount of glycine (B) are the same, the total mass of the trimethylglycine (A) and the glycine (B) is in the range of 20 to 30% by mass.

[0019] The content of each component in the present invention is expressed as the content when the hair cosmetic composition is taken as 100% by mass. The hair cosmetic composition of the present invention is preferably used on hair that has been permed, straightened, bleached, or colored.

[0020] The hair cosmetic composition of the present invention is preferred because, when applied to hair that has been permed, straightened, bleached, or colored, it tends to repair the crystalline structure formed by α-keratin in hair that has been damaged by chemical treatment, thereby restoring elasticity, and also because it tends to make hair smooth to run your fingers through.

[0021] <α-keratin> The hair cosmetic composition of the present invention can repair the crystalline structure formed by α-keratin and improve the elasticity and ease of running fingers through damaged hair.

[0022] The hair cosmetic composition of the present invention is preferably used to repair the crystalline structure formed by α-keratin. Alpha-keratin has a fibrous structure containing a helical structure (alpha-helix structure), and is also called fibrous keratin. It forms a crystalline structure by being regularly aligned in the axial direction of the hair fiber.

[0023] Alpha-keratin undergoes chemical reactions during chemical treatments such as perming, straightening, bleaching, or coloring, which can cause its crystalline structure to change. The deformation of the crystalline structure of α-keratin can be evaluated by a tensile test in water (underwater tensile test) described below, high-pressure differential scanning calorimetry, or the like.

[0024] <Component (I)> The hair cosmetic composition of the present invention comprises at least one component (I) selected from trimethylglycine (A) and glycine (B), and water (C). When component (I) contains trimethylglycine (A) but does not contain glycine (B), the hair cosmetic composition contains 20 to 60% by mass of trimethylglycine (A), preferably 40 to 60% by mass, and more preferably 50 to 60% by mass of trimethylglycine (A), and the mass ratio (A:C) of the trimethylglycine (A) to the water (C) is 1:5 to 3:2, preferably 2:3 to 3:2, and more preferably 1:1 to 3:2.

[0025] When component (I) contains trimethylglycine (A) but does not contain glycine (B), it is preferable to contain trimethylglycine (A) in the above range and have the mass ratio (A:C) of the trimethylglycine (A) to the water (C) within the above range, as this provides a rich elasticity, smoothness to the fingers, and the effect of repairing the crystalline structure formed by alpha-keratin.

[0026] When trimethylglycine (A) is contained as component (I) but glycine (B) is not contained, if the amount of trimethylglycine (A) is less than the above-mentioned lower limit, the hair may lack elasticity and may not be smooth. On the other hand, if the amount of trimethylglycine (A) is more than the above-mentioned upper limit, the hair may not dissolve or may precipitate, making it difficult to maintain the stability of the formulation.

[0027] The hair cosmetic composition of the present invention contains at least one component (I) selected from trimethylglycine (A) and glycine (B), and water (C). When component (I) contains trimethylglycine (A) but does not contain glycine (B), it is preferable that the hair cosmetic composition contains trimethylglycine (A) in the range of 40 to 60 mass % and that the mass ratio (A:C) of the trimethylglycine (A) to the water (C) is 2:3 to 3:2.

[0028] The hair cosmetic composition of the present invention comprises at least one component (I) selected from trimethylglycine (A) and glycine (B), and water (C). When component (I) contains trimethylglycine (A) but does not contain glycine (B), it is more preferable that the hair cosmetic composition contains 50 to 60 mass% of trimethylglycine (A) and that the mass ratio (A:C) of the trimethylglycine (A) to the water (C) is 1:1 to 3:2.

[0029] The hair cosmetic composition of the present invention comprises at least one component (I) selected from trimethylglycine (A) and glycine (B), and water (C). When component (I) does not contain trimethylglycine (A) but contains glycine (B), the glycine (B) is contained in an amount of 10 to 20% by mass, preferably 15 to 20% by mass, and the mass ratio (B:C) of the glycine (B) to the water (C) is 1:9 to 1:4, preferably 3:17 to 1:4.

[0030] When component (I) does not contain trimethylglycine (A) but does contain glycine (B), it is preferable to contain glycine (B) in the above range and have the mass ratio (B:C) of the glycine (B) to the water (C) within the above range, as this provides a rich elastic feel, improves finger combability, and provides a repair effect on the crystalline structure formed by α-keratin.

[0031] When component (I) does not contain trimethylglycine (A) but contains glycine (B), if the amount of glycine (B) is less than the lower limit, the hair may lack elasticity and may not be smooth. On the other hand, if the amount of glycine (B) is more than the upper limit, the hair may not dissolve or may precipitate, making it difficult to maintain the stability of the formulation.

[0032] The hair cosmetic composition of the present invention contains at least one component (I) selected from trimethylglycine (A) and glycine (B), and water (C). When component (I) does not contain trimethylglycine (A) but contains glycine (B), it is preferable that the glycine (B) is contained in an amount of 15 to 20 mass % and the mass ratio (B:C) of the glycine (B) to the water (C) is 3:17 to 1:4.

[0033] The hair cosmetic composition of the present invention contains at least one component (I) selected from trimethylglycine (A) and glycine (B), and water (C). When trimethylglycine (A) and glycine (B) are contained as component (I), the hair cosmetic composition satisfies any one of the following conditions (i) to (iii): (i) When the amount of trimethylglycine (A) is larger than the amount of glycine (B), the trimethylglycine (A) is contained in the range of 20 to 60% by mass, preferably 40 to 60% by mass, and the total mass of the trimethylglycine (A) and the glycine (B) is more than 20% by mass and not more than 61% by mass, preferably more than 40% by mass and not more than 61% by mass; (ii) When the amount of glycine (B) is larger than the amount of trimethylglycine (A), the glycine (B) is contained in an amount of 10 to 20% by mass, preferably 15 to 20% by mass, and the total mass of the trimethylglycine (A) and the glycine (B) is more than 10% by mass and not more than 21% by mass, preferably more than 15% by mass and not more than 21% by mass; (iii) When the blending amount of trimethylglycine (A) and the blending amount of glycine (B) are the same, the total mass of the trimethylglycine (A) and the glycine (B) is in the range of 20 to 30% by mass.

[0034] The hair cosmetic composition of the present invention is preferable if it satisfies any of the above conditions (i) to (iii), because it provides excellent elasticity, smoothness to the touch, and has the effect of repairing the crystalline structure formed by α-keratin.

[0035] When trimethylglycine (A) and glycine (B) are contained as the component (I), the hair cosmetic preferably satisfies the following condition (i): (i) When the amount of trimethylglycine (A) is greater than the amount of glycine (B), the trimethylglycine (A) is contained in the range of 40 to 60 mass%, and the total mass of the trimethylglycine (A) and the glycine (B) is in the range of more than 40 mass% but not more than 61 mass%.

[0036] In the hair cosmetic composition of the present invention, trimethylglycine (A) and glycine (B) are preferably dissolved in water (C). In the present invention, "trimethylglycine (A) and glycine (B) dissolved in water (C)" refers to a state in which trimethylglycine (A) and glycine (B) are uniformly dispersed in water (C) without precipitation or deposition.

[0037] [Trimethylglycine (A)] The hair cosmetic composition of the present invention contains at least one component (I) selected from trimethylglycine (A) and glycine (B), and water (C).

[0038] The hair cosmetic composition of the present invention is preferred because it contains trimethylglycine (A), which tends to improve the elasticity and smoothness of damaged hair. More specifically, the hair cosmetic composition of the present invention tends to improve the elasticity and smoothness of hair damaged by chemical treatments such as perming, straightening, bleaching, or coloring.

[0039] Trimethylglycine (A) is generally used as a moisturizer or feel improver for skin and hair, and its effect of repairing damage to hair γ-keratin was known from the prior art of Non-Patent Document 1 and Patent Document 1. However, no research has been conducted on its effect of repairing damage to hair α-keratin. In the present invention, we have discovered the effect of trimethylglycine (A) of repairing the crystalline structure formed by hair α-keratin, which was not disclosed in the prior art.

[0040] The hair cosmetic composition of the present invention contains at least one component (I) selected from trimethylglycine (A) and glycine (B), and water (C). When component (I) contains trimethylglycine (A) but not glycine (B), it preferably contains 50 to 60% by mass of trimethylglycine (A), the mass ratio (A:C) of trimethylglycine (A) to water (C) is 1:1 to 3:2, and no other optional components are contained. The inclusion of other optional components may reduce the effects of improving elasticity and smoothness and the effect of repairing the crystalline structure formed by α-keratin.

[0041] In the present invention, trimethylglycine (A) may be used, for example, as an anhydride, a monohydrate, or a salt, and may be used alone or in combination of two or more. As the trimethylglycine (A), for example, "Aminocoat" manufactured by Asahi Kasei Finechem Corporation can be used.

[0042] [Glycine (B)] The hair cosmetic composition of the present invention contains at least one component (I) selected from trimethylglycine (A) and glycine (B), and water (C).

[0043] The hair cosmetic composition of the present invention is preferred because it contains glycine (B), which tends to improve the elasticity and smoothness of damaged hair. More specifically, the hair cosmetic composition of the present invention tends to improve the elasticity and smoothness of hair damaged by chemical treatments such as perming, straightening, bleaching, or coloring.

[0044] Glycine (B) has generally been used as a moisturizer and feel improver for skin and hair. However, no research has been conducted on its effect of repairing damage to hair α-keratin. In the present invention, we have discovered the effect of glycine (B) on repairing the crystalline structure formed by hair α-keratin, which was not disclosed in the prior art.

[0045] The hair cosmetic composition of the present invention contains at least one component (I) selected from trimethylglycine (A) and glycine (B), and water (C). When component (I) does not contain trimethylglycine (A) but contains glycine (B), it preferably contains 15 to 20% by mass of glycine (B), the mass ratio (B:C) of the glycine (B) to the water (C) is 3:17 to 1:4, and no other optional components are contained. The inclusion of other optional components may reduce the effects of improving elasticity and smoothness and the effect of repairing the crystalline structure formed by α-keratin. As glycine (B), for example, "Glycine" manufactured by Nippon Rika Yakuhin Co., Ltd. can be used.

[0046] [Water (C)] The hair cosmetic composition of the present invention contains at least one component (I) selected from trimethylglycine (A) and glycine (B), and water (C).

[0047] The hair cosmetic composition of the present invention preferably contains water (C) in an amount of 39 to 90% by mass. When the component (I) contains trimethylglycine (A) but does not contain glycine (B), the component (I) preferably contains 40 to 60 mass %, more preferably 40 to 50 mass % of water (C).

[0048] When the component (I) does not contain trimethylglycine (A) but contains glycine (B), the component (I) preferably contains 80 to 90 mass %, more preferably 80 to 85 mass % of water (C).

[0049] When trimethylglycine (A) and glycine (B) are contained as the component (I), water (C) is preferably contained in an amount of 39 to 90 mass %. When trimethylglycine (A) and glycine (B) are contained as the component (I), it is more preferable that water (C) be contained under any one of the following conditions (i) to (iii): (i) When the amount of trimethylglycine (A) is greater than the amount of glycine (B), the amount of water (C) is more preferably 39 to 80 mass%; (ii) When the amount of glycine (B) is greater than the amount of trimethylglycine (A), the content of water (C) is more preferably 79 to 90 mass%; (iii) When the blending amount of trimethylglycine (A) and the blending amount of glycine (B) are the same, the blending amount of water (C) is more preferably 70 to 80 mass %.

[0050] In the present invention, specific examples of water (C) include tap water, ion-exchanged water, distilled water, purified water, and natural water, and sterilized water is preferred. As the water (C), for example, ion-exchanged water can be used.

[0051] Other ingredients The hair cosmetic composition of the present invention may contain optional ingredients other than the above-mentioned ingredients, provided that the effects of the present invention are not impaired. Examples of optional ingredients include moisturizers, herbal medicines, chelating agents, preservatives, antioxidants, cooling agents, antistatic agents, vitamins, proteins, fragrances, antibacterial agents, thickeners, emulsifiers, emulsion stabilizers, surfactants, higher alcohols, silicones, oils, solvents, and pigments.

[0052] The hair cosmetic composition of the present invention may contain optional components, specifically, propylene glycol and hexylene glycol as moisturizing agents; ethanol and phenoxyethanol as preservatives; citric acid, lactic acid and sodium lactate as pH adjusters; and distearyldimonium chloride as an antistatic agent.

[0053] pH The hair cosmetic composition of the present invention preferably has a pH of 4-9, more preferably 5-8. A pH within the above range is preferable because it puts less strain on the hair and provides sufficient effects.

[0054] 《Manufacturing method, etc.》 The hair cosmetic composition of the present invention can be produced by, for example, stirring, mixing, heating, dissolving, dispersing, or the like by a known method, except that the above-mentioned components are used in the above-mentioned amounts, and the production method is not particularly limited. The production method may be carried out under heated conditions to uniformly mix the components. When produced under heated conditions, the temperature can be, for example, 75 to 85°C.

[0055] Dosage form The hair cosmetic composition of the present invention may be in the form of, for example, a lotion (liquid), cream, milk, gel, mist, or spray, and from the viewpoints of ease of application to hair and stability as a formulation, a lotion or mist form is preferred.

[0056] The appearance of the hair cosmetic composition of the present invention may be, for example, transparent or opaque. From the viewpoint of uniformly mixing the various components of the hair cosmetic composition of the present invention, a transparent appearance is preferred.

[0057] The hair cosmetic composition of the present invention is more preferably in the form of a transparent lotion. From the viewpoint of stability as a preparation, the hair cosmetic composition of the present invention is preferably in a non-emulsified form.

[0058] 《How to use》 The hair cosmetic composition of the present invention can be used by applying it to hair in the form of a lotion or cream, or by spraying it onto hair in the form of a mist.

[0059] The hair cosmetic composition of the present invention is preferably applied to hair in the form of a lotion or mist. The hair cosmetic composition of the present invention is not particularly limited in its application, but is preferably used on hair that has been permed, straightened, bleached, or colored.

[0060] The hair cosmetic composition of the present invention can be used together with hair cleansing agents such as shampoos and treatments, and there are no particular restrictions on the type of use. However, if the hair cosmetic composition of the present invention is not rinsed off, the finished hair may feel sticky, and therefore it is preferably used in a rinse-off treatment.

[0061] The hair cosmetic composition of the present invention can be used without particular limitation whether the hair is in a dry or wet state. However, if the hair cosmetic composition of the present invention is applied to dry hair, uneven application may occur, and therefore it is preferable to apply the hair cosmetic composition to wet hair.

[0062] [Tensile test] A tensile test is a test that measures the initial modulus of elasticity and stress when hair is pulled with a constant load, and can be performed in air (air tensile test) or in water (underwater tensile test).

[0063] In air tensile tests, it is known that the contribution to the initial elastic modulus and stress from the crystalline structure formed by α-keratin is greater than the contribution from the amorphous structure formed by γ-keratin surrounding the crystalline structure.

[0064] In underwater tensile tests, the influence of water significantly reduces the contribution of the amorphous structure of gamma-keratin to the initial modulus and stress. Therefore, the initial modulus obtained in the elongation range of approximately 0 to 2%, known as the hook region, is thought to be mainly due to deformation of the crystalline structure of alpha-keratin.

[0065] In the present invention, in the examples described later, an underwater tensile test was conducted to measure the initial elastic modulus of damaged hair before and after treatment with the hair cosmetic composition of the present invention, thereby confirming the effect of repairing the crystalline structure formed by α-keratin. Details of this test are described in M. Feughelman et al. / Textile Research Journal, 41, pp. 469-474 (1971).

[0066] [High-Pressure Differential Scanning Calorimetry] High-pressure differential scanning calorimetry can measure the enthalpy change of the melting of the crystalline structure formed by α-keratin due to the thermal denaturation of hair as the denaturation enthalpy.

[0067] In the present invention, high-pressure differential scanning calorimetry was performed in the examples described below. By measuring the denaturation enthalpy of damaged hair before and after treatment with the hair cosmetic composition of the present invention, the effect of repairing the crystalline structure formed by α-keratin can be confirmed. Details of this test are described in FJ Wortmann et al. / Journal of Cosmetic Science, 53, pp. 219-228 (2002). [Example]

[0068] The present invention will now be described in more detail with reference to examples, but the present invention is not limited to these examples.

[0069] <Examples 1 to 25 and Comparative Examples 1 to 26> In the examples and comparative examples, commercially available products listed in Table 1 were used.

[0070] [Table 1]

[0071] Hair cosmetics were produced by mixing the ingredients according to the formulations shown in Tables 3 to 10, and were used as samples for the sensory evaluations (1) and (2) and the physical property evaluations (3) and (4). The results of (1) to (4) are shown in Tables 3 to 10. The numerical values ​​of the formulations in the tables represent the mass % of each component when the hair cosmetic composition is taken as 100 mass %, and are expressed as values ​​converted into pure contents.

[0072] [Making hair bundles] Multiple hair bundles (2 g) were prepared from black human hair (product name BS-PG, manufactured by Bealux, approximately 60 cm, 100 g) from the same individual. All prepared hair bundles were washed with a 10% aqueous solution of sodium laureth sulfate and allowed to dry naturally. One hair bundle was then taken and used as the untreated hair as the evaluation standard.

[0073] [Damage Processing] In order to reproduce the damage to the hair of an average person, the above hair bundle was subjected to a damage treatment in advance.

[0074] A mixture of 5g of the bleaching agent Arimino 120 Bleach (Arimino Co., Ltd.) and 10g of Color Story Admio OX6% (Arimino Co., Ltd.) was applied to a hair bundle with a brush and left at 25°C for 30 minutes. The hair bundle was then rinsed with running water and shampooed with 1g of Sherpa Design Supplement D-2 Shampoo (Arimino Co., Ltd.). After shampooing, the hair was rinsed with running water and dried with a hair dryer. The series of damage treatments was repeated twice to create damaged hair.

[0075] [Sensory evaluation] The damaged hair bundle was wetted with hot water at about 35°C and then immersed for 30 minutes at 30°C in 20 g of a hair cosmetic product prepared according to each formulation shown in Tables 3 to 10. The hair was then rinsed for 3 minutes with hot water at about 35°C, towel-dried, and then dried with a hair dryer.

[0076] Each finished hair bundle was subjected to a sensory evaluation according to the evaluation items (1) to (2). The sensory evaluation was carried out by 10 professional panelists (hairdressers) who each evaluated the product. The evaluation was carried out by calculating the average score of the 10 panelists based on the following evaluation criteria, which were listed for each evaluation item, and the evaluation was carried out as follows based on the average score.

[0077] ◎: The average score of the evaluation points of 10 professional panelists (hairdressers) is 3.5 points or higher. ○: The average score of the evaluation points of 10 professional panelists (hairdressers) is 2.5 points or more and less than 3.5 points. △: The average score of the evaluation points of 10 professional panelists (hairdressers) is 1.5 points or more but less than 2.5 points. ×: The average score of the evaluation points of 10 professional panelists (hairdressers) is less than 1.5 points.

[0078] (1) Elasticity The stress exerted on the fingers when the hair bundle was bent was taken as the elasticity, and the elasticity was evaluated. 4 points: Very strong stress on the fingers, very elastic 3 points: Strong stress on the fingers, elasticity 2 points: The pressure on the fingers is weak and there is little elasticity. 1 point: No stress on the fingers, no elasticity

[0079] (2) Smoothness The feel of the hair bundle when fingers were run through it was evaluated by touch. 4 points: Hair is not caught at all and is very smooth 3 points: Hair is smooth and not too tangled 2 points: Hair gets caught and is not smooth 1 point: Hair is very snagged and not smooth

[0080] [Physical property evaluation] (3) Tensile test (underwater tensile test) Thirty hairs were randomly collected from each hair bundle: untreated hair, damaged hair, and hair treated with the samples shown in Tables 3 to 10. The minor and major diameters of each collected hair were precisely measured under conditions of 20°C and 60% RH using a hair diameter measuring device (product name SK2000, manufactured by Kato Tech Co., Ltd.), and the cross-sectional area of ​​the hair was calculated by approximating it to an ellipse.

[0081] Next, the breaking load of the hair was measured using a tensile breaking tester (product name KES-G1-SH, manufactured by Kato Tech Co., Ltd.). Thirty hairs were randomly selected from each bundle of untreated hair, damaged hair, and hair treated with the formulations shown in Tables 3 to 10. One of the 30 hairs was placed in a tension jig with an initial length of 20 mm. It was then pulled at a rate of 2 mm / min in water at 20°C until breakage occurred. The jig was operated under computer control, and the load applied to the extension of each hair was recorded.

[0082] The breaking load of the hair is calculated from the load applied to the extension and divided by the cross-sectional area of ​​the hair to obtain the stress per unit area (×10 -9 N / m 2 ) and the average value of 30 pieces was calculated. This value was used as the initial modulus of elasticity (×10 -9 N / m 2The larger the initial elastic modulus, the more difficult it is to break. The above test was carried out in the same manner as that described in M. Feughelman et al., Textile Research Journal, 41, pp. 469-474 (1971).

[0083] (4) High-pressure differential scanning calorimetry Five milligrams of hair was randomly collected from each bundle of untreated hair, damaged hair, and hair treated with the samples shown in Tables 3 to 10 and shredded. Five milligrams of shredded hair and 10 μL of distilled water were placed in a sealed stainless steel sample container, sealed, and used as a sample. Additionally, 10 μL of distilled water alone was placed in a sealed stainless steel sample container, sealed, and used as a reference. These samples were then subjected to a high-pressure differential scanning calorimeter (HPDSC) (Hitachi High-Tech Science Corporation: DSC7020).

[0084] After equilibration at 30°C under a dry air purge, the temperature was increased to 190°C at a rate of 10°C / min to measure the denaturation enthalpy. Each sample was analyzed three times. The analytical results were analyzed using Hitachi High-Tech Science's thermal analysis software (Software for NEXTA) to obtain the denaturation enthalpy (J / g). A higher denaturation enthalpy value indicates a greater amount of crystalline structure formed by α-keratin, or a higher degree of crystallinity. The above measurements were carried out in the same manner as in the test described in FJ Wortmann et al., Journal of Cosmetic Science, 53, pp. 219-228 (2002).

[0085] [Criteria for evaluating physical properties] For hair treated with the samples of the formulations shown in Tables 3 to 10, the initial elastic modulus (×10 -9 N / m 2 ), and the denaturation enthalpy (J / g) obtained by high-pressure differential scanning calorimetry, the effect of repairing the crystalline structure formed by α-keratin was evaluated as follows.

[0086] [Table 2]

[0087] [Table 3]

[0088] [Table 4]

[0089] [Table 5]

[0090] [Table 6]

[0091] In Examples 14 to 19, the hair cosmetic composition of the present invention was used as a treatment agent for hair that had been permed, straightened, bleached, or colored.

[0092] [Table 7]

[0093] [Table 8]

[0094] Examples 20 to 25 are examples in which the hair cosmetic composition of the present invention was used as a wash-off treatment.

[0095] [Table 9]

[0096] [Table 10]

[0097] The hair cosmetics produced in Examples 1 to 25 showed good results in the sensory evaluation and physical property evaluation. Examples 3, 4, 8, 15, and 21 showed particularly good results. It has been found that the hair cosmetic composition of the present invention repairs the crystalline structure formed by α-keratin and improves the elasticity and ease of running fingers through damaged hair.

[0098] The hair cosmetics produced in Comparative Examples 1 to 4 correspond to cases in which trimethylglycine (A) was contained as component (I) but glycine (B) was not contained. In Comparative Examples 1 to 3, the amount of trimethylglycine (A) was less than the specified amount, so the hair tended to be difficult to run fingers through and not smooth. In Comparative Example 4, the amount of trimethylglycine (A) was more than the specified amount, so the hair did not dissolve or precipitated, and the formulation could not be maintained stable.

[0099] The hair cosmetics produced in Comparative Examples 5 to 7 correspond to cases in which the component (I) did not contain trimethylglycine (A) but contained glycine (B). In Comparative Examples 5 and 6, the amount of glycine (B) was less than the specified amount, so the hair tended to be difficult to run fingers through and not smooth. In Comparative Example 7, the amount of glycine (B) was more than the specified amount, so the hair did not dissolve or precipitated, and the formulation could not be maintained stable.

[0100] The hair cosmetics produced in Comparative Examples 8 to 12 correspond to cases containing trimethylglycine (A) and glycine (B) as component (I). Comparative Example 8 corresponds to (ii) a case in which the amount of glycine (B) was high relative to the amount of trimethylglycine (A), and since the amount of glycine (B) was less than the specified amount, the hair tended to lack elasticity and not be smooth to run one's fingers through. Comparative Examples 9 and 10 correspond to (i) a case in which the amount of trimethylglycine (A) was high relative to the amount of glycine (B), and since the amount of trimethylglycine (A) was less than the specified amount, the hair tended to lack elasticity and be smooth to run one's fingers through. In Comparative Examples 11 and 12, trimethylglycine (A) and glycine (B) did not dissolve or precipitated, and the dosage form could not be kept stable.

[0101] The hair cosmetic produced in Comparative Example 13 did not contain trimethylglycine (A) or glycine (B) as component (I), and therefore did not provide a bouncy feel or smoothness to run one's fingers through. The hair cosmetics produced in Comparative Examples 14 and 15 correspond to cases in which trimethylglycine (A) was contained as component (I) but glycine (B) was not contained. In Comparative Example 14, the amount of trimethylglycine (A) was less than the specified amount, so the hair tended to be difficult to run fingers through and not smooth. In Comparative Example 15, the amount of trimethylglycine (A) was more than the specified amount, so the hair did not dissolve or precipitated, and the formulation could not be maintained stable.

[0102] The hair cosmetics produced in Comparative Examples 16 and 17 correspond to cases in which the component (I) did not contain trimethylglycine (A) but contained glycine (B). In Comparative Example 16, the amount of glycine (B) was less than the specified amount, so the hair tended to lack elasticity, be difficult to run fingers through, and be less smooth. In Comparative Example 17, the amount of glycine (B) was more than the specified amount, so the hair did not dissolve or precipitated, and the formulation could not be maintained stably.

[0103] The hair cosmetics produced in Comparative Examples 18 and 19 correspond to cases containing trimethylglycine (A) and glycine (B) as component (I). Comparative Example 18 corresponds to a case where (i) the amount of trimethylglycine (A) was high relative to the amount of glycine (B), and since the amount of trimethylglycine (A) was less than the specified amount, the hair tended to feel less smooth to run one's fingers through. In Comparative Example 19, trimethylglycine (A) and glycine (B) did not dissolve or precipitated, and the formulation could not be maintained stably.

[0104] The hair cosmetic produced in Comparative Example 20 did not contain trimethylglycine (A) or glycine (B) as component (I), and therefore did not provide a sense of elasticity or smoothness when running fingers through the hair. The hair cosmetics produced in Comparative Examples 21 and 22 correspond to cases in which trimethylglycine (A) was contained as component (I) but glycine (B) was not contained. In Comparative Example 21, the amount of trimethylglycine (A) was less than the specified amount, so the hair tended to be difficult to run fingers through and not smooth. In Comparative Example 22, the amount of trimethylglycine (A) was more than the specified amount, so the hair did not dissolve or precipitated, and the formulation could not be maintained stably.

[0105] The hair cosmetics produced in Comparative Examples 23 and 24 correspond to cases in which the component (I) did not contain trimethylglycine (A) but contained glycine (B). In Comparative Example 23, the amount of glycine (B) was less than the specified amount, so the hair tended to lack elasticity, be difficult to run fingers through, and be less smooth. In Comparative Example 24, the amount of glycine (B) was more than the specified amount, so the hair did not dissolve or precipitated, and the formulation could not be maintained stably.

[0106] The hair cosmetics produced in Comparative Examples 25 and 26 correspond to cases containing trimethylglycine (A) and glycine (B) as component (I). Comparative Example 25 corresponds to a case where (i) the amount of trimethylglycine (A) was high relative to the amount of glycine (B). Because the amount of trimethylglycine (A) was less than the specified amount, the hair tended to lack elasticity and not feel smooth to run one's fingers through. In Comparative Example 26, trimethylglycine (A) and glycine (B) did not dissolve or precipitated, and the formulation could not be maintained stably.

Claims

1. A hair cosmetic comprising a component (I) that satisfies either of the following conditions (a) or (b) and water (C); (A) The component (I) contains trimethylglycine (A) and does not contain glycine (B), The trimethylglycine (A) is contained in the range of 50 to 60 mass %, and the mass ratio (A:C) of the trimethylglycine (A) to the water (C) is 1:5 to 3:2; (A) The component (I) contains trimethylglycine (A) and glycine (B), The blending amount of trimethylglycine (A) is larger than the blending amount of glycine (B), the trimethylglycine (A) is contained in the range of 40 to 60 mass %, and the total mass of the trimethylglycine (A) and the glycine (B) is in the range of more than 40 mass % to 61 mass % or less.

2. 2. The hair cosmetic composition according to claim 1, which is a transparent liquid.

3. 3. The hair cosmetic composition according to claim 1, which is used on hair that has been permed, straightened, bleached, or colored.

4. The hair cosmetic composition according to any one of claims 1 to 3, which is used as a rinse-off treatment.

5. The hair cosmetic composition according to any one of claims 1 to 4, which has a pH of 4 to 9.

6. The hair cosmetic composition according to any one of claims 1 to 5, which is applied to hair in the form of a lotion or mist.

7. The hair cosmetic composition according to any one of claims 1 to 6, which is in a non-emulsified form.

8. The hair cosmetic composition according to any one of claims 1 to 7, which is used to repair the crystalline structure formed by α-keratin.

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