Oil-based hair cosmetic composition

Abstract

An oil-based hair cosmetic composition including (A) a branched-chain fatty acid that is liquid at 25°C, and (B) a branched-chain hydrocarbon that has a carbon number of 15 or less, wherein the component (A) content in the composition is 0.001 mass% to 2 mass%, and the component (B) content in the composition is 20 mass% or more.

Description

Oily Hair Cosmetic Composition

[0001] The present invention relates to an oily hair cosmetic composition.

[0002] Oily hair cosmetics having treatment effects, styling properties and the like are known in the art. For example, Patent Document 1 discloses that even for hair damaged by sunlight, daily hair care activities and the like, the hair cosmetic has excellent spreadability and compatibility when wet after towel-drying and when dry, can provide sufficient hair setting property, smoothness, good finger combing performance and gloss, and the hairstyle is not easily collapsed even after combing with hands or when the hair is vibrated, and furthermore, there is no stickiness from application to finishing. As such hair cosmetic, a leave-in type hair cosmetic containing a C12-30 iso fatty acid or anteiso fatty acid, or a salt thereof, and a predetermined modified organopolysiloxane, with a water content of 5 mass% or less, is proposed. Patent Document 2 proposes a hair cosmetic that can not only obtain a styling effect but also achieve a restyling effect while imparting hair treatment effects such as smoothness, moist feeling and gloss to hair, which contains a drying oil having an iodine value of 145 or more, dimethicone, and an ester oil that is liquid at 20°C.

[0003] (Patent Document 1) Japanese Unexamined Patent Publication No. 2010-105954 (Patent Document 2) Japanese Unexamined Patent Publication No. 2023-97465

[0004] The present invention relates to the following. [1] An oily hair cosmetic composition comprising the following component (A) and component (B): (A) a branched fatty acid that is liquid at 25°C; (B) a branched hydrocarbon having 15 or less carbon atoms, wherein the content of the component (A) in the composition is 0.001 mass% or more and 2 mass% or less, and the content of the component (B) in the composition is 20 mass% or more. [2] A hair treatment method, wherein the method comprises the following step (I) and step (II) in order, and does not include a step of rinsing hair between the step (I) and step (II): Step (I): a step of applying the oily hair cosmetic composition according to [1] to hair; Step (II): a step of drying the hair to which the oily hair cosmetic composition has been applied Detailed Description of the Invention

[0005] Incidentally, hair with a history of chemical treatments such as hair coloring, bleaching, and perming (damaged hair) has the problem of feeling stiff. However, the oily hair cosmetics described in Patent Documents 1 and 2 still had room for further improvement in their effect of imparting softness to damaged hair. Also, when hair coloring or bleaching is applied to only a part of the hair, such as in highlights, or when time has passed since chemical treatments such as hair coloring or perming, the hair contains a mixture of healthy hair without a history of chemical treatment and damaged hair with a history of chemical treatment. When oily hair cosmetics are applied to such hair, there is a problem that a difference in softness occurs between the healthy hair portion and the damaged hair portion, resulting in an uneven feel of the hair. Furthermore, because oily hair cosmetics contain a large amount of oily components, there was also the problem that the hair was less manageable to comb through when it dried after application, and that the hair tended to become sticky after drying.

[0006] The present invention relates to an oily hair cosmetic composition that can impart softness to damaged hair with a history of chemical treatment, and even when applied to hair containing a mixture of healthy hair without a history of chemical treatment and the aforementioned damaged hair, it provides uniform softness throughout the hair, allows for smooth combing during hair drying, and reduces stickiness after drying.

[0007] The present inventors have found that an oily hair cosmetic composition containing liquid branched-chain fatty acids and branched-chain hydrocarbons with 15 or fewer carbon atoms in predetermined ranges at 25°C can solve the above problem.

[0008] According to the present invention, it is possible to impart softness to damaged hair with a history of chemical treatment, and even when applied to hair containing a mixture of healthy hair without a history of chemical treatment and the aforementioned damaged hair, a uniform softness can be obtained throughout the hair, the hair is easy to comb through when drying, and the hair is less sticky after drying.

[0009] [Definitions] In this specification, "hair" mainly refers to human head hair, but also includes hair that has been detached from a human head. "Hair with a history of chemical treatment" (hereinafter also referred to as "damaged hair") means hair that has undergone one or more chemical treatments selected from the group consisting of hair color, bleach, powder bleach, and perm treatment, and typically refers to hair that has undergone the aforementioned chemical treatments one or more times and has also been repeatedly washed. "Oily hair cosmetic composition" means a hair cosmetic composition that contains an oily component as its main component and has a water content of 10% by mass or less. Here, an oily component refers to a component that is insoluble in water (IOB of 0 or more and 0.5 or less in the organic conceptual diagram), and a main component refers to a component that accounts for 50% by mass or more of the total amount. The "Organic Concept Diagram" was proposed by Fujita Atsushi, and its details are explained in "Pharmaceutical Bulletin", vol.2, 2, pp.163-173 (1954), "The Domain of Chemistry", vol.11, 10, pp.719-725 (1957), "Fragrance Journal", vol.50, pp.79-82 (1981), and "Organic Concept Diagram - Fundamentals and Applications -" (by Koda Yoshio, Sankyo Publishing, 1984), etc. In other words, all organic compounds are considered derivatives of methane (CH4), and a certain numerical value is assigned to each of their carbon number, substituents, transformation parts, rings, etc., and these values ​​are added together to obtain organic and inorganic values, which are then plotted on a diagram with organic values ​​on the X axis and inorganic values ​​on the Y axis. "IOB in the Organic Concept Diagram" refers to the ratio of the inorganic value (IV) to the organic value (OV) in the organic concept diagram, i.e., "inorganic value (IV) / organic value (OV)".Specific examples of water-insoluble components (with an IOB of 0 or more and 0.5 or less in the organic conceptual diagram) include, for example, isododecane (0), hydrogenated polyisobutene (0), mineral oil (0), jojoba oil (0.07), octyldodecyl isostearate (0.08), isostearyl isostearate (0.09), octyldodecyl neopentanoate (0.13), triisostearin (0.16), isopropyl myristate (0.09), isodecyl neopentanoate (0.22), dimethylpolysiloxane (0.3-0.5), phenyl trimethicone (0.28), methyl trimethicone (0.175), isopropyl palmitate (0.162), hydrogenated castor oil (0.42), etc. (the numbers in parentheses indicate IOB). "Containing component X" or "containing component X" also means "composed of component X."

[0010] In this specification, "liquid" means a viscosity of 7,000 mPa·s or less as measured by a B-type viscometer at 25°C. For example, a TVB10M viscometer (manufactured by Toki Sangyo Co., Ltd.) can be used as the B-type viscometer and measured under the following conditions: (1) When viscosity is less than 100 mPa·s, rotor: L / Adp, 6 rpm, 60 sec (2) When viscosity is 100 mPa·s or more and 1,000 mPa·s or less, rotor: M-1, 6 rpm, 60 sec (3) When viscosity is 1,000 mPa·s or more and less than 10,000 mPa·s, rotor: M-3, 12 rpm, 60 sec

[0011] [Oily Hair Cosmetic Composition] The oily hair cosmetic composition of the present invention contains the following components (A) and (B): (A) a branched-chain fatty acid that is liquid at 25°C (B) a branched-chain hydrocarbon having 15 or fewer carbon atoms, wherein the content of component (A) in the composition is 0.001% by mass or more and 2% by mass or less, and the content of component (B) in the composition is 20% by mass or more. The oily hair cosmetic composition of the present invention, having the above configuration, can impart softness to damaged hair with a history of chemical treatment, and even when applied to hair where healthy hair without a history of chemical treatment and the damaged hair are mixed, uniform softness can be obtained throughout the hair (hereinafter also referred to as "improvement of uniformity of hair softness"), the hair is easy to comb through when drying, and the hair is less sticky after drying.

[0012] The reason why the oily hair cosmetic composition of the present invention exhibits the above effects is not entirely clear, but it is presumed to be as follows. When hair is damaged by chemical treatment, it becomes stiff to the touch, so an effect that softens and imparts softness to the hair is desired as a damage care effect of the oily hair cosmetic composition. As a hair damage care technology using an oily hair cosmetic composition, a method of modifying the hair surface with the oily hair cosmetic composition is common. In contrast, in the oily hair cosmetic composition of the present invention, component (A), which is a fatty acid that is liquid at room temperature and is a damage care component, is thought to penetrate into the inside of the hair and increase the fluidity of intercellular lipids, thereby providing a softening effect to damaged hair. Here, since component (A) is a fatty acid that is liquid at room temperature and has branched chains of a certain length, it is thought to easily penetrate into the inside of damaged hair but not easily penetrate into the inside of healthy hair. Therefore, the oily hair cosmetic composition of the present invention has a high softening effect on damaged hair but has little effect on the flexibility of healthy hair. Even when applied to hair containing a mixture of healthy and damaged hair, it is believed that a uniform softness can be obtained throughout the hair as a result.

[0013] When the amount of component (A) in the oily hair cosmetic composition is above a predetermined amount, it can effectively soften damaged hair. Conversely, when the amount of component (A) in the oily hair cosmetic composition is below a predetermined amount, the excess component (A) that did not penetrate into the hair remains on the hair surface in an appropriate amount, providing smoothness while resulting in a less sticky feel.

[0014] Component (B) in the oily hair cosmetic composition is thought to have the effect of dissolving component (A) and efficiently penetrating component (A) into the damaged hair. Furthermore, since component (B) is a volatile oily component, it is thought that applying the composition to both healthy and damaged hair will result in smoother hair when dried, and that after drying, less excess oily component will remain on the hair surface, resulting in a less sticky feel. However, the mechanism of action of the present invention is not limited to the above.

[0015] <Component (A): Branched-chain fatty acid that is liquid at 25°C> The branched-chain fatty acid used as component (A) is liquid at 25°C. Component (A) may be either a saturated fatty acid or an unsaturated fatty acid, but is preferably a saturated fatty acid. From the viewpoint of imparting softness to damaged hair, improving the uniformity of hair softness, improving the manageability of hair when drying, and reducing stickiness of hair after drying, component (A) preferably contains branched-chain fatty acids having 8 or more carbon atoms, more preferably 12 or more, even more preferably 14 or more, and also preferably 24 or fewer carbon atoms, more preferably 20 or fewer, and even more preferably 18 or fewer. Furthermore, component (A) preferably contains branched-chain fatty acids having 8 to 24 carbon atoms, more preferably 12 to 20 carbon atoms, even more preferably 14 to 20 carbon atoms, and even more preferably 14 to 18 carbon atoms.

[0016] Component (A) may be one or more selected from the group consisting of iso fatty acids, anteiso fatty acids, iso fatty acids having only one branching point, branched fatty acids other than anteiso fatty acids, and polybranched fatty acids, all of which are liquid at 25°C. Polybranched fatty acids refer to branched-chain fatty acids having two or more branching points.

[0017] Component (A) preferably contains one or more selected from the group consisting of 2-ethylhexanoic acid, isononyl acid, isotetradecanoic acid, anteisopentadecanoic acid, isopalmitic acid, anteisoheptadecanoic acid, isostearic acid, polybranched isostearic acid, and isobehenic acid, more preferably contains one or more selected from the group consisting of isotetradecanoic acid, isopalmitic acid, isostearic acid, and polybranched isostearic acid, even more preferably contains one or more selected from the group consisting of isopalmitic acid, isostearic acid, and polybranched isostearic acid, even more preferably contains one or more selected from the group consisting of isopalmitic acid and isostearic acid, and even more preferably contains isostearic acid.

[0018] The content of component (A) in the oily hair cosmetic composition is 0.001% by mass or more, preferably 0.01% by mass or more, more preferably 0.05% by mass or more, even more preferably 0.1% by mass or more, even more preferably 0.2% by mass or more, and even more preferably 0.3% by mass or more, from the viewpoint of providing softness to damaged hair, improving the uniformity of hair softness, and reducing stickiness of hair after drying, is 2% by mass or less, preferably 1.5% by mass or less, more preferably 1% by mass or less, even more preferably 0.8% by mass or less, and even more preferably 0.7% by mass or less. Furthermore, the content of component (A) in the oily hair cosmetic composition is 0.001% by mass or more and 2% by mass or less, preferably 0.01% by mass or more and 1.5% by mass or less, more preferably 0.05% by mass or more and 1% by mass or less, even more preferably 0.1% by mass or more and 0.8% by mass or less, even more preferably 0.2% by mass or more and 0.8% by mass or less, and even more preferably 0.3% by mass or more and 0.7% by mass or less.

[0019] <Component (B): Branched-chain hydrocarbon with 15 or fewer carbon atoms> The branched-chain hydrocarbon with 15 or fewer carbon atoms used as component (B) has 15 or fewer carbon atoms, preferably 14 or fewer, more preferably 13 or fewer, and even more preferably 12 or fewer, from the viewpoint of improving the manageability of hair when drying, improving the uniformity of hair softness, and reducing stickiness of hair after drying. Furthermore, from the viewpoint of improving the manageability of hair when drying, it preferably has 6 or more carbon atoms, more preferably 8 or more, and even more preferably 10 or more. And component (B) has 15 or fewer carbon atoms, preferably 6 to 15, more preferably 8 to 14, even more preferably 8 to 13, and even more preferably 10 to 12.

[0020] The viscosity of component (B) at 25°C is preferably 12 mPa·s or less, more preferably 10 mPa·s or less, even more preferably 8 mPa·s or less, even more preferably 5 mPa·s or less, and even more preferably 3 mPa·s or less, from the viewpoint of improving the uniformity of hair softness, improving the manageability of hair when drying, and reducing stickiness of hair after drying. Furthermore, from the viewpoint of allowing component (A) to penetrate damaged hair and impart softness, and from the viewpoint of improving the manageability of hair when drying, it is preferably 1 mPa·s or more, and more preferably 1.2 mPa·s or more. The viscosity of component (B) at 25°C is preferably 1 mPa·s to 12 mPa·s, more preferably 1 mPa·s to 10 mPa·s, even more preferably 1 mPa·s to 8 mPa·s, even more preferably 1 mPa·s to 5 mPa·s, and even more preferably 1.2 mPa·s to 3 mPa·s. The viscosity of component (B) can be measured at 25°C by the method described above.

[0021] Component (B), from the viewpoint of improving the manageability of hair when drying, preferably contains one or more selected from the group consisting of 2-methylpentane, 2,2-dimethylbutane, isooctane, 2-ethylhexane, isononane, isodecane, isododecane, isotridecane, isotetradecane, and hydrogenated polyisobutene with 15 or fewer carbon atoms; more preferably contains one or more selected from the group consisting of isooctane, 2-ethylhexane, isononane, isodecane, isododecane, isotridecane, isotetradecane, and hydrogenated polyisobutene with 15 or fewer carbon atoms; even more preferably contains one or more selected from the group consisting of isododecane and hydrogenated polyisobutene with 15 or fewer carbon atoms; and even more preferably contains isododecane. The isododecane referred to here includes the component called "isododecane" in cosmetic labeling names. Furthermore, hydrogenated polyisobutene with 15 or fewer carbon atoms refers to ingredients with 15 or fewer carbon atoms among those labeled as "hydrogenated polyisobutene" in cosmetic labeling, but also includes ingredients labeled as "light isoparaffin" in quasi-drug labeling.

[0022] Component (B) preferably contains 50% by mass or more, more preferably 60% by mass or more, even more preferably 70% by mass or more, even more preferably 80% by mass or more, even more preferably 90% by mass or more, even more preferably 95% by mass or more, and even more preferably 100% by mass or less, from the viewpoint of improving the manageability of hair when drying and reducing stickiness of hair after drying. Furthermore, the content of branched chain hydrocarbons with 12 or fewer carbon atoms in component (B) is preferably 50% by mass or more and 100% by mass or less, more preferably 60% by mass or more and 100% by mass or less, even more preferably 70% by mass or more and 100% by mass or less, even more preferably 80% by mass or more and 100% by mass or less, even more preferably 90% by mass or more and 100% by mass or less, and even more preferably 95% by mass or more and 100% by mass or less.

[0023] The content of component (B) in the oily hair cosmetic composition is 20% by mass or more, preferably 30% by mass or more, more preferably 40% by mass or more, even more preferably 50% by mass or more, even more preferably 60% by mass or more, even more preferably 70% by mass or more, even more preferably 80% by mass or more, even more preferably 85% by mass or more, and even more preferably 90% by mass or more, from the viewpoint of providing softness to damaged hair, improving the uniformity of hair softness, and improving the manageability of the hair when it is dry, it is preferably 99.99% by mass or less, more preferably 99.9% by mass or less, and even more preferably 99.5% by mass or less. Furthermore, the content of component (B) in the oily hair cosmetic composition is 20% by mass or more, preferably 30% by mass or more and 99.99% by mass or less, more preferably 40% by mass or more and 99.9% by mass or less, even more preferably 50% by mass or more and 99.9% by mass or less, even more preferably 60% by mass or more and 99.9% by mass or less, even more preferably 70% by mass or more and 99.9% by mass or less, even more preferably 80% by mass or more and 99.5% by mass or less, even more preferably 85% by mass or more and 99.5% by mass or less, and even more preferably 90% by mass or more and 99.5% by mass or less.

[0024] The mass ratio of component (B) to component (A) [(B) / (A)] is preferably 10 or more, more preferably 30 or more, even more preferably 50 or more, even more preferably 70 or more, even more preferably 100 or more, even more preferably 150 or more, even more preferably 170 or more, and even more preferably 180 or more, from the viewpoint of improving the manageability of hair when drying and reducing stickiness of hair after drying. Furthermore, from the viewpoint of imparting softness to damaged hair and improving the uniformity of hair softness, it is preferably 2000 or less, more preferably 1500 or less, even more preferably 1200 or less, even more preferably 1000 or less, even more preferably 800 or less, even more preferably 600 or less, even more preferably 400 or less, even more preferably 350 or less, even more preferably 300 or less, and even more preferably 250 or less. Furthermore, the mass ratio of component (B) to component (A) [(B) / (A)] is preferably 10 to 2000, more preferably 30 to 1500, even more preferably 50 to 1200, even more preferably 100 to 1000, even more preferably 150 to 800, even more preferably 170 to 600, even more preferably 180 to 400, even more preferably 180 to 300, and even more preferably 180 to 250. Also, from the viewpoint of improving the softness of damaged hair, this mass ratio [(B) / (A)] may be 70 to 400 or 70 to 350.

[0025] The total content of component (A) and component (B) in the oily hair cosmetic composition is preferably 25% by mass or more, more preferably 35% by mass or more, even more preferably 50% by mass or more, even more preferably 60% by mass or more, even more preferably 70% by mass or more, even more preferably 80% by mass or more, and even more preferably 85% by mass or more, and 100% by mass or less, from the viewpoint of imparting softness to damaged hair, improving the uniformity of hair softness, improving the manageability of hair when drying, and reducing stickiness of hair after drying. The oily hair cosmetic composition of the present invention, in terms of easily enjoying the effects of the present invention, preferably contains, as component (A), one or more selected from the group consisting of isopalmitic acid and isostearic acid in an amount of 0.001% to 2% by mass, more preferably 0.01% to 1.5% by mass, more preferably 0.05% to 1% by mass, even more preferably 0.1% to 0.8% by mass, even more preferably 0.2% to 0.8% by mass, and even more preferably 0.3% to 0.7% by mass. The component (B) contains 20% by mass or more of one or more selected from the group consisting of isododecane and hydrogenated polyisobutene having 15 or fewer carbon atoms, more preferably 30% by mass or more and 99.99% by mass or less, even more preferably 40% by mass or more and 99.9% by mass or less, even more preferably 50% by mass or more and 99.9% by mass or less, even more preferably 60% by mass or more and 99.9% by mass or less, even more preferably 70% by mass or more and 99.9% by mass or less, even more preferably 80% by mass or more and 99.5% by mass or less, even more preferably 85% by mass or more and 99.5% by mass or less, and even more preferably 90% by mass or more and 99.5% by mass or less.

[0026] <Component (C): An ester that is liquid at 25°C, comprising a monovalent carboxylic acid having 3 to 25 carbon atoms and a monovalent to trivalent chain alcohol having 2 to 20 carbon atoms> From the viewpoint of improving the softness of damaged hair and improving the uniformity of hair softness, the oily hair cosmetic composition of the present invention preferably further contains component (C): an ester that is liquid at 25°C, comprising a monovalent carboxylic acid having 3 to 25 carbon atoms and a monovalent to trivalent chain alcohol having 2 to 20 carbon atoms. The chain alcohol referred to here is a linear or branched chain alcohol that does not contain a ring structure.

[0027] Component (C) preferably contains one or more selected from the group consisting of a triester of a fatty acid having 8 to 25 carbon atoms and glycerin, an ester of a monovalent aromatic carboxylic acid having 7 to 25 carbon atoms and a monovalent chain alcohol having 8 to 20 carbon atoms, and an ester of a fatty acid having 8 to 25 carbon atoms and a monovalent chain alcohol having 2 to 20 carbon atoms, from the viewpoint of improving the softness of damaged hair and improving the uniformity of hair softness.

[0028] Examples of triesters of fatty acids having 8 to 25 carbon atoms and glycerin include tri(caprylic / capric acid) glyceryl, tri-2-ethylhexanoate glyceryl [triethylhexanoin], and triglyceryl esters of fatty acids having 16 to 24 carbon atoms. Examples of triglyceryl esters of fatty acids having 16 to 24 carbon atoms include vegetable oils such as macadamia seed oil, baobab seed oil, argania spinosa kernel oil, soybean oil, crambe abyssinica seed oil, jojoba seed oil, and sunflower seed oil. The triesters of fatty acids having 8 to 25 carbon atoms and glycerin preferably contain one or more selected from the group consisting of tri-2-ethylhexanoate glyceryl and triglyceryl esters of fatty acids having 16 to 24 carbon atoms, and more preferably contain one or more selected from the group consisting of tri-2-ethylhexanoate glyceryl and macadamia seed oil.

[0029] As an ester of a monovalent aromatic carboxylic acid having 7 to 25 carbon atoms and a monovalent linear alcohol having 8 to 20 carbon atoms, it is preferable to include an ester of benzoic acid and a monovalent linear alcohol having 8 to 20 carbon atoms, and more preferably an ester of benzoic acid and a monovalent linear alcohol having 12 to 15 carbon atoms, which is alkyl benzoate (C12-15). Examples of commercially available alkyl benzoate (C12-15) include "Finsolve TN (TN-O)" from Innosspec Active Chemicals LLC, "Cetiol AB" and "Cetiol ABV" from BASF Japan, and Sasol. Examples include "COSMACOL EBL" from Ltd., "CRODAMOL AB" from Croda Japan, "LIPONATE NTB" from Vantage Specialty Ingredients, Inc., and "TEGOSOFT TN" from Evonik Operations GmbH.

[0030] Examples of esters of fatty acids having 8 to 25 carbon atoms and monovalent chain alcohols having 2 to 20 carbon atoms include cetyl ethylhexanoate, stearyl ethylhexanoate, hexyldecyl ethylhexanoate, isononyl isononanoate, isotridecyl isononanoate, hexyl laurate, isostearyl laurate, isopropyl myristate, butyl myristate, decyl myristate, isotridecyl myristate, isopropyl palmitate, ethylhexyl palmitate, ethylhexyl stearate, isopropyl isostearate, and others, preferably containing isopropyl palmitate.

[0031] Component (C) may be one or more types. Among the above, from the viewpoint of improving the softness of damaged hair and improving the uniformity of hair softness, component (C) is more preferably tri(caprylic / capric acid) glyceryl, tri-2-ethylhexanoate glyceryl, triglyceryl ester of fatty acid having 16 to 24 carbon atoms, alkyl (C12-15) benzoate, cetyl ethylhexanoate, stearyl ethylhexanoate, hexyldecyl ethylhexanoate, isononyl isononanoate, isotridecyl isononanoate, hexyl laurate, isostearyl laurate, isopropyl myristate It comprises one or more selected from the group consisting of butyl myristate, decyl myristate, isotridecyl myristate, isopropyl palmitate, ethylhexyl palmitate, ethylhexyl stearate, and isopropyl isostearate, more preferably one or more selected from the group consisting of glyceryl tri-2-ethylhexanoate, macadamia seed oil, alkyl benzoate (C12-15), and isopropyl palmitate, and even more preferably one or more selected from the group consisting of macadamia seed oil and isopropyl palmitate.

[0032] When the oily hair cosmetic composition contains component (C), the content of component (C) in the oily hair cosmetic composition 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, even more preferably 0.7% by mass or more, even more preferably 1% by mass or more, and even more preferably 2% by mass or more, from the viewpoint of improving the softness of damaged hair, improving the uniformity of hair softness, and improving the manageability of hair when it is dried. Furthermore, from the viewpoint of reducing stickiness of hair after drying, the content is preferably 15% by mass or less, more preferably 12% by mass or less, even more preferably 10% by mass or less, even more preferably 8% by mass or less, even more preferably 6% by mass or less, and even more preferably 5% by mass or less. Furthermore, the content of component (C) in the oily hair cosmetic composition is preferably 0.1% by mass or more and 15% by mass or less, more preferably 0.2% by mass or more and 12% by mass or less, even more preferably 0.5% by mass or more and 10% by mass or less, even more preferably 0.7% by mass or more and 8% by mass or less, even more preferably 1% by mass or more and 6% by mass or less, and even more preferably 2% by mass or more and 5% by mass or less.

[0033] The oily hair cosmetic composition of the present invention preferably further contains component (C) in such a way that it is easier to enjoy the effects of the present invention, and component (A) contains 0.001% by mass or more and 2% by mass or less of one or more selected from the group consisting of isopalmitic acid and isostearic acid, more preferably 0.01% by mass or more and 1.5% by mass or less, more preferably 0.05% by mass or more and 1% by mass or less, even more preferably 0.1% by mass or more and 0.8% by mass or less, even more preferably 0.2% by mass or more and 0.8% by mass or less, and even more preferably 0.3% by mass or more and 0.7% by mass or less. The above component (B) contains 20% by mass or more of one or more selected from the group consisting of isododecane and hydrogenated polyisobutene having 15 or fewer carbon atoms, more preferably 30% by mass or more, even more preferably 40% by mass or more, even more preferably 40% by mass or more and 99.5% by mass or less, even more preferably 50% by mass or more and 99.5% by mass or less, even more preferably 60% by mass or more and 99.5% by mass or less, even more preferably 70% by mass or more and 99.5% by mass or less, even more preferably 80% by mass or more and 99.5% by mass or less, even more preferably 85% by mass or more and 99.5% by mass or less, and even more preferably 90% by mass or more and 99.5% by mass or less. The aforementioned component (C) contains 0.1% to 15% by mass of one or more selected from the group consisting of glyceryl tri-2-ethylhexanoate, macadamia seed oil, alkyl benzoate (C12-15), and isopropyl palmitate, more preferably 0.2% to 12% by mass, even more preferably 0.5% to 10% by mass, even more preferably 0.7% to 8% by mass, even more preferably 1% to 6% by mass, and even more preferably 2% to 5% by mass.

[0034] When an oily hair cosmetic composition contains component (C), the mass ratio of component (C) to component (A) [(C) / (A)] is preferably 0.1 or more, more preferably 0.5 or more, even more preferably 1 or more, even more preferably 2 or more, even more preferably 3 or more, and even more preferably 4 or more, from the viewpoint of improving the softness of damaged hair, improving the uniformity of hair softness, and improving the manageability of hair when it is dry. Furthermore, from the viewpoint of reducing stickiness of hair after drying, it is preferably 200 or less, more preferably 100 or less, even more preferably 50 or less, even more preferably 30 or less, even more preferably 15 or less, and even more preferably 10 or less. The mass ratio of component (C) to component (A) [(C) / (A)] is preferably 0.1 to 200, more preferably 0.5 to 100, even more preferably 1 to 50, even more preferably 2 to 30, even more preferably 3 to 15, and even more preferably 4 to 10.

[0035] When an oily hair cosmetic composition contains component (C), the mass ratio of component (B) to component (C) [(B) / (C)] is preferably 5 or more, more preferably 10 or more, even more preferably 20 or more, even more preferably 25 or more, and even more preferably 30 or more, from the viewpoint of improving the manageability of hair when drying and reducing stickiness of hair after drying. Furthermore, from the viewpoint of improving the softness of damaged hair and improving the uniformity of hair softness, it is preferably 400 or less, more preferably 300 or less, even more preferably 200 or less, even more preferably 150 or less, even more preferably 100 or less, even more preferably 80 or less, and even more preferably 50 or less. Furthermore, the mass ratio of component (B) to component (C) [(B) / (C)] is preferably 5 to 400, more preferably 5 to 300, even more preferably 10 to 200, even more preferably 10 to 150, even more preferably 20 to 100, even more preferably 20 to 80, even more preferably 25 to 50, and even more preferably 30 to 50.

[0036] When the oily hair cosmetic composition contains component (C), the mass ratio of component (B) to the total amount of component (A) and component (C) [(B) / {(A)+(C)}] is preferably 2 or more, more preferably 5 or more, even more preferably 10 or more, even more preferably 15 or more, and even more preferably 20 or more, from the viewpoint of improving the manageability of hair when drying and reducing stickiness of hair after drying. Furthermore, from the viewpoint of improving the softness of damaged hair and improving the uniformity of hair softness, it is preferably 350 or less, even more preferably 200 or less, even more preferably 150 or less, even more preferably 100 or less, even more preferably 75 or less, and even more preferably 40 or less. Furthermore, the mass ratio of component (B) to the total amount of component (A) and component (C) [(B) / {(A)+(C)}] is preferably 2 to 350, more preferably 5 to 200, even more preferably 10 to 150, even more preferably 15 to 100, even more preferably 15 to 75, and even more preferably 20 to 40.

[0037] <Component (D): Modified Silicone> The oily hair cosmetic composition of the present invention preferably further contains component (D): modified silicone from the viewpoint of improving the softness of damaged hair, improving the uniformity of hair softness, and improving the manageability of hair when it is dry. The modified silicone used as component (D) is a silicone other than polydimethylsiloxane (dimethicone), wherein the main chain of polydimethylsiloxane contains -SiO(CH ３ ) ２ Silicones with structures other than - introduced, polydimethylsiloxane with -SiO(CH) at the end. ３ ) ３ This includes silicones into which functional groups other than those mentioned above have been introduced, and silicones in which some of the methyl groups of polydimethylsiloxane have been replaced with other functional groups.

[0038] The component (D) used in the present invention includes one or more selected from the group consisting of polyether-modified silicone, carboxy-modified silicone, alkyl-modified silicone, amino-modified silicone, aminopolyether-modified silicone, alkylamino-modified silicone, fluoroalkyl-modified silicone, carbinol-modified silicone, phenyl-modified silicone, polyglycerin-modified silicone, higher fatty acid ester-modified silicone, polysiloxane betaine, poly(N-acylalkyleneimine)-modified organopolysiloxane, and dimethiconol. Among these, from the viewpoint of improving the softness of damaged hair, improving the uniformity of hair softness, improving the manageability of hair when drying, and solubility in the composition, component (D) preferably comprises one or more selected from the group consisting of alkyl-modified silicone, alkylamino-modified silicone, fluoroalkyl-modified silicone, phenyl-modified silicone, poly(N-acylalkyleneimine)-modified organopolysiloxane, and dimethiconol, and more preferably comprises one or more selected from the group consisting of alkylamino-modified silicone, phenyl-modified silicone, poly(N-acylalkyleneimine)-modified organopolysiloxane, and dimethiconol.

[0039] (Alkylamino-modified silicone) Examples of alkylamino-modified silicone include modified silicones in which alkyl groups and amino group-containing groups are introduced to the side chains and / or terminals of the silicone. From the viewpoint of improving the manageability of hair when drying and reducing stickiness of hair after drying, bisalkyl amodimethicone is preferred, more preferably comprising one or more selected from the group consisting of bisalkyl (C30-45) amodimethicone and biscetearyl amodimethicone, and more preferably comprising bisalkyl (C30-45) amodimethicone. Examples of commercially available alkylamino-modified silicones include "Silsoft AX-L" (bisalkyl (C30-45) amodimethicone) and "Silsoft AX" (biscetearyl amodimethicone) from Momentive Performance Materials.

[0040] (Phenyl-modified silicone) Examples of phenyl-modified silicone include modified silicones in which phenyl groups are introduced to the side chains and / or terminals of the silicone. From the viewpoint of improving the manageability of hair when drying and reducing stickiness of hair after drying, it is preferable to include one or more selected from the group consisting of phenyl trimethicone, diphenyl dimethicone, diphenylsiloxy phenyl trimethicone, and triphenyldimethylvinyl disiloxane, more preferably one or more selected from the group consisting of diphenyl dimethicone and phenyl trimethicone, and more preferably diphenylsiloxy phenyl trimethicone. Examples of commercially available phenyl-modified silicones include "DOWSIL SH 556 Fluid (phenyl trimethicone)" from Dow Toray, "SilShine 150 Fluid" (diphenyl dimethicone) and "SilShine VP Fluid" (triphenyldimethylvinyl disiloxane) from Momentive Performance Materials, and "Silicone KF-56A" (diphenylsiloxy phenyl trimethicone) from Shin-Etsu Chemical Co., Ltd.

[0041] (Poly(N-acylalkyleneimine)-modified organopolysiloxane) Examples of poly(N-acylalkyleneimine)-modified organopolysiloxanes include poly(N-formylethyleneimine)organopolysiloxane, poly(N-acetylethyleneimine)organopolysiloxane, poly(N-propionylethyleneimine)organopolysiloxane, and preferably include poly(N-propionylethyleneimine)methylsiloxane, which is represented by the INCI name: polysilicone-9.

[0042] (Dimethiconol) Dimethiconol is a silicone obtained by substituting part of the methyl groups of polydimethylsiloxane (dimethicone) with hydroxy groups. Commercially available dimethiconol products include, for example, "Silicone X-21-5613", "Silicone X-21-5666", "Silicone X-21-5847", and silicone "X-21-5849" manufactured by Shin-Etsu Chemical Co., Ltd.; "XIAMETER™ PMX-1501 Fluid", "1501FLUID", and "1503FLUID" manufactured by Dow Toray Co., Ltd.; and "XS65-C1717", "XF49-C2497" manufactured by Momentive Performance Materials Inc., etc.

[0043] Component (D) may be used alone or in combination of two or more thereof. Among the above, from the viewpoints of improving finger combability when drying hair and reducing stickiness of hair after drying, component (D) more preferably comprises one or more selected from the group consisting of alkylamino-modified silicones, phenyl-modified silicones, and dimethiconol; still more preferably comprises an alkylamino-modified silicone; even more preferably comprises bisalkylamodimethicone; and even more preferably comprises one or more selected from the group consisting of bisalkyl (C30-45) amodimethicone and biscetearyl amodimethicone. Furthermore, from the viewpoints of improving finger combability when drying hair and reducing stickiness of hair after drying, component (D) more preferably comprises one or more selected from the group consisting of alkylamino-modified silicones, phenyl-modified silicones, and dimethiconol; still more preferably comprises one or more selected from the group consisting of bisalkylamodimethicone, diphenyl dimethicone, diphenylsiloxyphenyl trimethicone, triphenyl dimethyl vinyl disiloxane, and dimethiconol; even more preferably comprises one or more selected from the group consisting of bisalkyl (C30-45) amodimethicone, diphenylsiloxyphenyl trimethicone, and dimethiconol; and even more preferably comprises bisalkyl (C30-45) amodimethicone.

[0044] When the oily hair cosmetic composition contains component (D), the content of component (D) in the oily hair cosmetic composition is preferably 0.1% by mass or more, more preferably 0.2% by mass or more, and even more preferably 0.3% by mass or more, from the viewpoint of improving the manageability of hair when drying and reducing stickiness of hair after drying. Furthermore, from the viewpoint of reducing stickiness of hair after drying, it is preferably 5% by mass or less, more preferably 3% by mass or less, even more preferably 2% by mass or less, even more preferably 1% by mass or less, and even more preferably 0.6% by mass or less. And the content of component (D) in the oily hair cosmetic composition is preferably 0.1% by mass or more and 5% by mass or less, more preferably 0.1% by mass or more and 3% by mass or less, even more preferably 0.2% by mass or more and 2% by mass or less, even more preferably 0.3% by mass or more and 1% by mass or less, and even more preferably 0.3% by mass or more and 0.6% by mass or less.

[0045] Furthermore, the oily hair cosmetic composition is more preferably to contain component (C) and component (D). The oily hair cosmetic composition of the present invention preferably contains component (C) and component (D) in such a way that it is easier to enjoy the effects of the present invention, and component (A) contains 0.001% by mass or more and 2% by mass or less of one or more selected from the group consisting of isopalmitic acid and isostearic acid, more preferably 0.01% by mass or more and 1.5% by mass or less, more preferably 0.05% by mass or more and 1% by mass or less, even more preferably 0.1% by mass or more and 0.8% by mass or less, even more preferably 0.2% by mass or more and 0.8% by mass or less, and even more preferably 0.3% by mass or more and 0.7% by mass or less. The above component (B) contains 20% by mass or more of one or more selected from the group consisting of isododecane and hydrogenated polyisobutene having 15 or fewer carbon atoms, more preferably 30% by mass or more, even more preferably 40% by mass or more, even more preferably 40% by mass or more and 99.5% by mass or less, even more preferably 50% by mass or more and 99.5% by mass or less, even more preferably 60% by mass or more and 99.5% by mass or less, even more preferably 70% by mass or more and 99.5% by mass or less, even more preferably 80% by mass or more and 99.5% by mass or less, even more preferably 85% by mass or more and 99.5% by mass or less, and even more preferably 90% by mass or more and 99.5% by mass or less. The aforementioned component (C) contains 0.1% to 15% by mass of one or more selected from the group consisting of glyceryl tri-2-ethylhexanoate, macadamia seed oil, alkyl benzoate (C12-15), and isopropyl palmitate, more preferably 0.2% to 12% by mass, even more preferably 0.5% to 10% by mass, even more preferably 0.7% to 8% by mass, even more preferably 1% to 6% by mass, and even more preferably 2% to 5% by mass. The component (D) contains 0.1% to 5% by mass of one or more selected from the group consisting of bisalkyl (C30-45) amodimethicone, diphenylsiloxyphenyl trimethicone, and dimethiconol, more preferably 0.1% to 3% by mass, even more preferably 0.2% to 2% by mass, even more preferably 0.3% to 1% by mass, and even more preferably 0.3% to 0.6% by mass.

[0046] <Other Ingredients> In addition to the above components, the oily hair cosmetic composition can appropriately contain components that are normally formulated in hair cosmetics. Examples of such components include non-volatile oils other than component (A) and component (C); volatile solvents other than component (B); oily agents that are solid or semi-solid at 25°C; surfactants; anti-dandruff agents; vitamins; bactericides; anti-inflammatory agents; preservatives; chelating agents; humectants; colorants such as dyes and pigments; extracts; pearling agents; perfumes; ultraviolet absorbers; antioxidants; photocatalysts; pH adjusters, and the like.

[0047] However, the content of water in the oily hair cosmetic composition of the present invention is preferably 5% by mass or less, more preferably 3% by mass or less, still more preferably 2% by mass or less, even more preferably 1.5% by mass or less, even more preferably 1% by mass or less, even more preferably 0.5% by mass or less, even more preferably 0.2% by mass or less, and even more preferably 0.1% by mass or less, and the composition may be substantially free of water. As used herein, the term "substantially free of" means that the content of the target substance in the oily hair cosmetic composition is less than 0.01% by mass.

[0048] In addition, from the viewpoint of not inhibiting the softness of damaged hair, the content of the surfactant in the oily hair cosmetic composition of the present invention is preferably 10% by mass or less, more preferably 7% by mass or less, still more preferably 5% by mass or less, even more preferably 3% by mass or less, even more preferably 1% by mass or less, and even more preferably 0.1% by mass or less, and the composition may be substantially free of the surfactant.

[0049] In addition, from the viewpoint of not inhibiting the softness of damaged hair, the content of the oily agent that is solid or semi-solid at 25°C in the oily hair cosmetic composition of the present invention is preferably 5% by mass or less, more preferably 3% by mass or less, still more preferably 1.5% by mass or less, even more preferably 1% by mass or less, even more preferably 0.5% by mass or less, and even more preferably 0.1% by mass or less, and the composition may be substantially free of the oily agent.

[0050] Furthermore, the content of film-forming polymers (excluding those corresponding to component (D)) in the oily hair cosmetic composition of the present invention is preferably 10% by mass or less, more preferably 7% by mass or less, even more preferably 5% by mass or less, even more preferably 3% by mass or less, even more preferably 2% by mass or less, even more preferably 1% by mass or less, and even more preferably 0.1% by mass or less, from the viewpoint of not inhibiting the softness of damaged hair, and may be substantially omitted.

[0051] Furthermore, the powder content in the oily hair cosmetic composition of the present invention is preferably 5% by mass or less, more preferably 3% by mass or less, even more preferably 1.5% by mass or less, even more preferably 1% by mass or less, even more preferably 0.5% by mass or less, and even more preferably 0.1% by mass or less, from the viewpoint of not hindering the softness of damaged hair, and may be substantially omitted.

[0052] The method for producing the oily hair cosmetic composition of the present invention is not particularly limited. For example, it can be produced by blending component (A) and component (B), and other components used as needed, in the manner described in the examples, and mixing them using a known stirring device or the like.

[0053] <Embodiments> The oily hair cosmetic composition of the present invention is preferably liquid at room temperature (25°C). Methods of use of the oily hair cosmetic composition include directly applying the liquid oily hair cosmetic composition to the hair and scalp; and taking the oily hair cosmetic composition into the palm of the hand and applying it to the hair and scalp by hand. From the viewpoint of usability, it is preferable to take the oily hair cosmetic composition into the palm of the hand and apply it to the hair and scalp by hand. The oily hair cosmetic composition of the present invention can also be implemented in forms other than liquid, such as foam or mist, depending on the combination with other components and the mechanism of the container. For example, the oily hair cosmetic composition and a propellant can be mixed within a quantitative and qualitative range that does not impair the effects of the present invention to produce aerosol products such as hair foam, spray foam, and hair mist (spray). Liquefied petroleum gas, nitrogen gas, carbon dioxide, dimethyl ether, etc., can be used as propellants. The type of oily hair cosmetic composition (product form) is preferably one that is used in a form in which the hair is dried without rinsing after application. Examples include leave-in treatments, hair lotions, hair oils, and styling products, with hair oil being the most preferred among them.

[0054] [Hair Treatment Method] The present invention further provides a hair treatment method comprising the following steps (I) and (II) in order, wherein the step of rinsing the hair between step (I) and step (II) is not included. Step (I): A step of applying the oily hair cosmetic composition to the hair. Step (II): A step of drying the hair to which the oily hair cosmetic composition has been applied.

[0055] <Step (I)> In Step (I), the oily hair cosmetic composition of the present invention is applied to the hair. The hair referred to here preferably includes damaged hair with a history of chemical treatment, and more preferably includes damaged hair with a history of chemical treatment and repeated washing, from the viewpoint of effectively exhibiting the effects of the present invention. The hair to which the oily hair cosmetic composition is applied in Step (I) may be in a dry or wet state. When applying the composition to wet hair, the hair to be treated is first made wet by performing a step to increase its moisture content, and then the oily hair cosmetic composition is applied to the wet hair. Methods to increase the moisture content of hair (to make the hair moist) include (i) soaking in water, (ii) wetting or rinsing with water, (iii) washing with a hair cleansing agent composition, (iv) treating with a rinse-off type conditioner or treatment and then rinsing with water, (v) applying a water-containing spray or mist, (vi) applying steam, (vii) wrapping with a wet towel, (vii) wrapping with plastic wrap, aluminum foil, etc., while wet with water, and one or more of these methods can be used. After making the hair moist using the above methods, towel drying may be performed. The water content in wet hair is not particularly limited, but when the mass of hair after conditioning at 20°C and 65% relative humidity for 24 hours is taken as 1, the mass ratio of water to the mass of hair (mass of water / mass of hair) is preferably 0.05 or more, more preferably 0.10 or more, even more preferably 0.2 or more, even more preferably 0.3 or more, even more preferably 0.5 or more, even more preferably 0.7 or more, and even more preferably 1.0 or more, and also preferably 5 or less, more preferably 3 or less, and even more preferably 2 or less. Furthermore, the water content in wet hair is such that, when the mass of hair after conditioning at 20°C and 65% relative humidity for 24 hours is set to 1, the mass ratio of water to the mass of hair (mass of water / mass of hair) is preferably 0.05 or more and 5 or less, more preferably 0.10 or more and 5 or less, even more preferably 0.2 or more and 5 or less, even more preferably 0.3 or more and 5 or less, even more preferably 0.5 or more and 5 or less, even more preferably 0.7 or more and 3 or less, and even more preferably 1.0 or more and 2 or less.

[0056] The method of applying the oily hair cosmetic composition can be appropriately selected depending on the product form or dosage form, but examples include casting, spraying, or coating, and two or more of these may be combined. As mentioned above, in step (I), it is preferable to take the oily hair cosmetic composition into the palm of the hand and apply it to the hair and scalp by hand and let it blend in. The amount of oily hair cosmetic composition applied to the hair is preferably 0.001 or more, more preferably 0.005 or more, even more preferably 0.01 or more, and preferably 0.5 or less, more preferably 0.3 or less, even more preferably 0.2 or less, and even more preferably 0.1 or less, in terms of the mass ratio to the dry mass of the hair (mass of oily hair cosmetic composition / dry mass of hair). The amount of the oily hair cosmetic composition applied to the hair is preferably 0.001 to 0.5, more preferably 0.005 to 0.3, even more preferably 0.01 to 0.2, and even more preferably 0.01 to 0.1, in terms of mass ratio to the dry mass of the hair (mass of oily hair cosmetic composition / dry mass of hair). The hair to which the oily hair cosmetic composition is applied only needs to be at least a portion of the scalp hair.

[0057] The hair to which the oily hair cosmetic composition has been applied in step (I) is subjected to step (II) without a rinsing step. More specifically, the "rinsing step of the hair" means the step of washing off the oily hair cosmetic composition applied to the hair with water.

[0058] <Step (II)> In Step (II), the hair to which the oily hair cosmetic composition was applied in Step (I) is dried. The drying method in Step (II) includes natural drying, but a method that actively dries the hair is preferred, such as drying with a hair dryer (cold or hot air), air drying, and a combination of two or more of these drying treatments. The oily hair cosmetic composition of the present invention makes the hair easier to comb through when performing Step (II). In addition, it can impart softness to the hair after performing Step (II), and even when applied to hair that contains a mixture of healthy hair with no history of chemical treatment and damaged hair, a uniform softness is obtained throughout the hair, and the hair becomes less sticky.

[0059] Furthermore, the oily hair cosmetic composition of the present invention can also be applied to fibers for headwear products other than hair. In this specification, "headwear products" means, for example, hair wigs, hairpieces, weaving, hair extensions, braided hair, hair accessories, doll hair, etc. Also, "fibers for headwear products" means fibers used in the aforementioned headwear products.

[0060] For headwear products, either naturally derived fibers or synthetic fibers may be used, but naturally derived fibers are preferred. Naturally derived fibers refer to fibers extracted from natural animals and plants (excluding human hair), or fibers artificially manufactured using proteins, polysaccharides, etc. as raw materials. Of these, fibers artificially manufactured using animal hair, or proteins or polysaccharides such as keratin, collagen, casein, as well as proteins derived from soybeans, peanuts, corn, silk, etc., are preferred. Regenerated protein fibers made from keratin, collagen, casein, soy protein, peanut protein, corn protein, silk protein (e.g., silk fibroin) are more preferred, regenerated protein fibers such as regenerated collagen fibers made from collagen, and regenerated silk fibers made from silk fibroin are even more preferred, and regenerated collagen fibers are even more preferred. Regenerated collagen fibers can be manufactured using known technologies. The composition of regenerated collagen fibers does not need to be 100% collagen; natural polymers, synthetic polymers, additives, etc., may be included for quality improvement. Furthermore, regenerated collagen fibers may be post-processed or post-treated. Filaments are preferred as the form of regenerated collagen fibers. Filaments are generally extracted from bobbins or boxes. Alternatively, filaments that come out of the drying process during the manufacturing of regenerated collagen fibers can be used directly.

[0061] Examples of synthetic fibers include fibers containing synthetic resin as the main component. From the viewpoint of ease of manufacturing the synthetic fiber and obtaining a texture similar to hair, the synthetic resin is preferably a thermoplastic resin, and more preferably one or more selected from the group consisting of polyester resin, polyamide resin, polyimide resin, polyamide-imide resin, vinyl chloride resin, polycarbonate resin, polyphenylene sulfide resin, and modacrylic resin (a copolymer of acrylonitrile and vinyl chloride). Here, "main component" means a component whose content in the synthetic fiber is preferably 50% by mass or more, more preferably 60% by mass or more, even more preferably 70% by mass or more, even more preferably 80% by mass or more, and even more preferably 90% by mass or more, and 100% by mass or less. In addition to the synthetic resin described above, the synthetic fiber may further contain various components such as flame retardants, flame retardant aids, light or heat stabilizers, fluorescent agents, antioxidants, antistatic agents, and ultraviolet absorbers, to the extent that they do not hinder the effects of the present invention.

[0062] With respect to the embodiments described above, the present invention further discloses the following embodiments: <1> An oily hair cosmetic composition comprising the following components (A) and (B): (A) a branched-chain fatty acid that is liquid at 25°C and (B) a branched-chain hydrocarbon having 15 or fewer carbon atoms, wherein the content of component (A) in the composition is 0.001% by mass or more and 2% by mass or less, and the content of component (B) in the composition is 20% by mass or more. <2> The oily hair cosmetic composition of <1>, wherein component (A) comprises a saturated fatty acid. <3> The oily hair cosmetic composition of <1> or <2>, wherein component (A) comprises a branched-chain fatty acid having 8 to 24 carbon atoms. <4> The oily hair cosmetic composition of any one of <1> to <3>, wherein component (A) comprises a branched-chain fatty acid having 14 to 18 carbon atoms. <5> An oily hair cosmetic composition according to any one of <1> to <4>, wherein component (A) comprises one or more selected from the group consisting of iso fatty acids, anteiso fatty acids, iso fatty acids having only one branching point, branched fatty acids other than anteiso fatty acids, and polybranched fatty acids, which are liquid at 25°C. <6> An oily hair cosmetic composition according to any one of <1> to <5>, wherein component (A) comprises one or more selected from the group consisting of 2-ethylhexanoic acid, isononyl acid, isotetradecanoic acid, anteisopentadecanoic acid, isopalmitic acid, anteisoheptadecanoic acid, isostearic acid, polybranched isostearic acid, and isobehenic acid. <7> An oily hair cosmetic composition according to any one of <1> to <6>, wherein component (A) comprises one or more selected from the group consisting of isopalmitic acid and isostearic acid. <8> An oily hair cosmetic composition according to any one of <1> to <7>, wherein component (A) contains isostearic acid. <9> An oily hair cosmetic composition according to any one of <1> to <8>, wherein the content of component (A) in the oily hair cosmetic composition is 0.01% by mass or more. <10> An oily hair cosmetic composition according to any one of <1> to <9>, wherein the content of component (A) in the oily hair cosmetic composition is 0.1% by mass or more. <11> An oily hair cosmetic composition according to any one of <1> to <10>, wherein the content of component (A) in the oily hair cosmetic composition is 0.2% by mass or more.<12> An oily hair cosmetic composition according to any one of <1> to <11>, wherein the content of component (A) in the oily hair cosmetic composition is 1.5% by mass or less. <13> An oily hair cosmetic composition according to any one of <1> to <12>, wherein the content of component (A) in the oily hair cosmetic composition is 1% by mass or less. <14> An oily hair cosmetic composition according to any one of <1> to <13>, wherein the carbon number of component (B) is 6 or more and 15 or less. <15> An oily hair cosmetic composition according to any one of <1> to <14>, wherein the carbon number of component (B) is 8 or more and 14 or less, more preferably 8 or more and 13 or less. <16> An oily hair cosmetic composition according to any one of <1> to <15>, wherein the carbon number of component (B) is 10 or more and 12 or less. <17> An oily hair cosmetic composition according to any one of <1> to <16>, wherein the viscosity of component (B) at 25°C is 1 mPa·s or more and 12 mPa·s or less. <18> An oily hair cosmetic composition according to any one of <1> to <17>, wherein the viscosity of component (B) at 25°C is 1 mPa·s or more and 5 mPa·s or less. <19> An oily hair cosmetic composition according to any one of <1> to <18>, wherein component (B) comprises one or more selected from the group consisting of 2-methylpentane, 2,2-dimethylbutane, isooctane, 2-ethylhexane, isononane, isodecane, isododecane, isotridecane, isotetradecane, and hydrogenated polyisobutene having 15 or less carbon atoms. <20> An oily hair cosmetic composition according to any one of <1> to <19>, wherein component (B) comprises one or more selected from the group consisting of isooctane, 2-ethylhexane, isononane, isodecane, isododecane, isotridecane, isotetradecane, and hydrogenated polyisobutene having 15 or fewer carbon atoms. <21> An oily hair cosmetic composition according to any one of <1> to <20>, wherein component (B) comprises one or more selected from the group consisting of isododecane, isotridecane, isotetradecane, and hydrogenated polyisobutene having 15 or fewer carbon atoms. <22> An oily hair cosmetic composition according to any one of <1> to <21>, wherein component (B) comprises one or more selected from the group consisting of isododecane and hydrogenated polyisobutene having 15 or fewer carbon atoms. <23> An oily hair cosmetic composition according to any one of <1> to <22>, wherein component (B) comprises isododecane.<24> An oily hair cosmetic composition according to any one of <1> to <23>, wherein component (A) contains 0.001% by mass or more and 2% by mass of one or more selected from the group consisting of isopalmitic acid and isostearic acid, and component (B) contains 20% by mass or more of one or more selected from the group consisting of isododecane and hydrogenated polyisobutene having 15 or fewer carbon atoms. <25> An oily hair cosmetic composition according to any one of <1> to <24>, wherein the content of branched hydrocarbons having 12 or fewer carbon atoms in component (B) is 50% by mass or more and 100% by mass or less. <26> An oily hair cosmetic composition according to any one of <1> to <25>, wherein the content of branched hydrocarbons having 12 or fewer carbon atoms in component (B) is 70% by mass or more and 100% by mass or less. <27> An oily hair cosmetic composition according to any one of <1> to <26>, wherein the content of branched hydrocarbons having 12 or fewer carbon atoms in component (B) is 90% by mass or more and 100% by mass or less. <28> An oily hair cosmetic composition according to any one of <1> to <27>, wherein the content of component (B) in the oily hair cosmetic composition is 30% by mass or more. <29> An oily hair cosmetic composition according to any one of <1> to <28>, wherein the content of component (B) in the oily hair cosmetic composition is 50% by mass or more. <30> An oily hair cosmetic composition according to any one of <1> to <29>, wherein the content of component (B) in the oily hair cosmetic composition is 99.9% by mass or less. <31> An oily hair cosmetic composition according to any one of <1> to <30>, wherein the content of component (B) in the oily hair cosmetic composition is 99.5% by mass or less.

[0063] <32> An oily hair cosmetic composition according to any one of <1> to <31>, wherein the mass ratio of component (B) to component (A) [(B) / (A)] is 10 or more and 2000 or less. <33> An oily hair cosmetic composition according to any one of <1> to <32>, wherein the mass ratio of component (B) to component (A) [(B) / (A)] is 30 or more and 1500 or less, more preferably 50 or more and 1200 or less. <34> An oily hair cosmetic composition according to any one of <1> to <33>, wherein the mass ratio of component (B) to component (A) [(B) / (A)] is 150 or more and 800 or less, more preferably 180 or more and 300 or less. <35> An oily hair cosmetic composition according to any one of <1> to <33>, wherein the mass ratio of component (B) to component (A) [(B) / (A)] is 70 to 400, more preferably 70 to 350. <36> An oily hair cosmetic composition according to any one of <1> to <35>, wherein the total content of component (A) and component (B) in the oily hair cosmetic composition is 35% by mass or more. <37> An oily hair cosmetic composition according to any one of <1> to <36>, wherein the total content of component (A) and component (B) in the oily hair cosmetic composition is 100% by mass or less. <38> An oily hair cosmetic composition according to any one of <1> to <37>, further containing component (C): an ester that is liquid at 25°C, and is an ester of a monovalent carboxylic acid having 3 to 25 carbon atoms and a monovalent to trivalent chain alcohol having 2 to 20 carbon atoms. <39> The oily hair cosmetic composition of <38>, wherein component (C) comprises one or more selected from the group consisting of a triester of a fatty acid having 8 to 25 carbon atoms and glycerin, an ester of a monovalent aromatic carboxylic acid having 7 to 25 carbon atoms and a monovalent chain alcohol having 8 to 20 carbon atoms, and an ester of a fatty acid having 8 to 25 carbon atoms and a monovalent chain alcohol having 2 to 20 carbon atoms. <40> The oily hair cosmetic composition of <39>, wherein the triester of a fatty acid having 8 to 25 carbon atoms and glycerin comprises one or more selected from the group consisting of tri(caprylic / capric acid) glyceryl tri(caprylic acid / capric acid), glyceryl tri-2-ethylhexanoate [triethylhexanoin], and triglyceryl esters of fatty acids having 16 to 24 carbon atoms.<41> The oily hair cosmetic composition of <40>, wherein the triglyceryl ester of a fatty acid having 16 to 24 carbon atoms comprises one or more vegetable oils selected from the group consisting of macadamia seed oil, baobab seed oil, argania spinosa kernel oil, soybean oil, crambe abyssinica seed oil, jojoba seed oil, and sunflower seed oil. <42> The oily hair cosmetic composition of <40>, wherein the triester of a fatty acid having 8 to 25 carbon atoms and glycerin comprises one or more selected from the group consisting of glyceryl tri-2-ethylhexanoate and triglyceryl esters of fatty acids having 16 to 24 carbon atoms. <43> The oily hair cosmetic composition of <40>, wherein the triester of a fatty acid having 8 to 25 carbon atoms and glycerin comprises one or more selected from the group consisting of glyceryl tri-2-ethylhexanoate and macadamia seed oil. <44> An oily hair cosmetic composition according to any one of <40> to <43>, wherein the ester of a monovalent aromatic carboxylic acid having 7 to 25 carbon atoms and a monovalent chain alcohol having 8 to 20 carbon atoms comprises an ester of benzoic acid and a monovalent chain alcohol having 8 to 20 carbon atoms. <45> An oily hair cosmetic composition according to any one of <40> to <44>, wherein the ester of a monovalent aromatic carboxylic acid having 7 to 25 carbon atoms and a monovalent chain alcohol having 8 to 20 carbon atoms comprises an alkyl benzoate (C12-15), which is an ester of benzoic acid and a monovalent chain alcohol having 12-15 carbon atoms. <46> An oily hair cosmetic composition according to any one of <40> to <45>, wherein the ester of a fatty acid having 8 to 25 carbon atoms and a monovalent chain alcohol having 2 to 20 carbon atoms comprises one or more selected from the group consisting of cetyl ethylhexanoate, stearyl ethylhexanoate, hexyldecyl ethylhexanoate, isononyl isononanoate, isotridecyl isononanoate, hexyl laurate, isostearyl laurate, isopropyl myristate, butyl myristate, decyl myristate, isotridecyl myristate, isopropyl palmitate, ethylhexyl palmitate, ethylhexyl stearate, and isopropyl isostearate.<47> An oily hair cosmetic composition according to any one of <40> to <46>, wherein the ester of a fatty acid having 8 to 25 carbon atoms and a monovalent chain alcohol having 2 to 20 carbon atoms contains isopropyl palmitate.

[0064] <48> An oily hair cosmetic composition according to any one of <38> to <47>, wherein component (C) comprises one or more selected from the group consisting of tri(caprylic / capric acid) glyceryl, tri-2-ethylhexanoate glyceryl, triglyceryl esters of fatty acids having 16 to 24 carbon atoms, alkyl (C12-15) benzoate, cetyl ethylhexanoate, stearyl ethylhexanoate, hexyldecyl ethylhexanoate, isononyl isononanoate, isotridecyl isononanoate, hexyl laurate, isostearyl laurate, isopropyl myristate, butyl myristate, decyl myristate, isotridecyl myristate, isopropyl palmitate, ethylhexyl palmitate, ethylhexyl stearate, and isopropyl isostearate. <49> An oily hair cosmetic composition according to any one of <38> to <48>, wherein component (C) comprises one or more selected from the group consisting of glyceryl tri-2-ethylhexanoate, macadamia seed oil, alkyl benzoate (C12-15), and isopropyl palmitate. <50> An oily hair cosmetic composition according to any one of <38> to <49>, wherein component (C) comprises one or more selected from the group consisting of macadamia seed oil and isopropyl palmitate. <51> An oily hair cosmetic composition according to any one of <38> to <50>, wherein the content of component (C) in the oily hair cosmetic composition is 0.1% by mass or more and 15% by mass or less. <52> An oily hair cosmetic composition according to any one of <38> to <51>, wherein the content of component (C) in the oily hair cosmetic composition is 0.5% by mass or more and 10% by mass or less. <53> An oily hair cosmetic composition according to any one of <38> to <52>, wherein the content of component (C) in the oily hair cosmetic composition is 2% by mass or more and 5% by mass or less.<54> An oily hair cosmetic composition according to any one of <38> to <53>, wherein component (A) contains 0.001% by mass or more and 2% by mass of one or more selected from the group consisting of isopalmitic acid and isostearic acid, component (B) contains 20% by mass or more of one or more selected from the group consisting of isododecane and hydrogenated polyisobutene having 15 or less carbon atoms, and component (C) contains 0.1% by mass or more and 15% by mass of one or more selected from the group consisting of glyceryl tri-2-ethylhexanoate, macadamia seed oil, alkyl benzoate (C12-15), and isopropyl palmitate. <55> An oily hair cosmetic composition according to any one of <38> to <54>, wherein component (A) contains 0.001% to 2% by mass of one or more selected from the group consisting of isopalmitic acid and isostearic acid, component (B) contains 40% to 40% by mass of one or more selected from the group consisting of isododecane and hydrogenated polyisobutene having 15 or less carbon atoms, and component (C) contains 0.1% to 15% by mass of one or more selected from the group consisting of glyceryl tri-2-ethylhexanoate, macadamia seed oil, alkyl benzoate (C12-15), and isopropyl palmitate. <56> An oily hair cosmetic composition according to any one of <38> to <55>, wherein the mass ratio of component (C) to component (A) [(C) / (A)] is 0.1 to 200. <57> An oily hair cosmetic composition according to any one of <38> to <56>, wherein the mass ratio of component (C) to component (A) [(C) / (A)] is 4 or more and 10 or less. <58> An oily hair cosmetic composition according to any one of <38> to <57>, wherein the mass ratio of component (B) to component (C) [(B) / (C)] is 5 or more and 400 or less. <59> An oily hair cosmetic composition according to any one of <38> to <58>, wherein the mass ratio of component (B) to component (C) [(B) / (C)] is preferably 5 or more and 400 or less, more preferably 20 or more and 80 or less, and even more preferably 25 or more and 50 or less. <60> An oily hair cosmetic composition according to any one of <38> to <59>, wherein the mass ratio of component (B) to the total amount of component (A) and component (C) [(B) / {(A)+(C)}] is 2 or more and 350 or less.<61> An oily hair cosmetic composition according to any one of <38> to <60>, wherein the mass ratio of component (B) to the total amount of component (A) and component (C) [(B) / {(A)+(C)}] is 20 or more and 40 or less. <62> An oily hair cosmetic composition according to any one of <1> to <61>, further comprising component (D): modified silicone. <63> An oily hair cosmetic composition according to <62>, wherein component (D) comprises one or more selected from the group consisting of polyether-modified silicone, carboxy-modified silicone, alkyl-modified silicone, amino-modified silicone, aminopolyether-modified silicone, alkylamino-modified silicone, fluoroalkyl-modified silicone, carbinol-modified silicone, phenyl-modified silicone, polyglycerin-modified silicone, higher fatty acid ester-modified silicone, polysiloxane betaine, poly(N-acylalkyleneimine)-modified organopolysiloxane, and dimethiconol. <64> An oily hair cosmetic composition of <62> or <63>, wherein component (D) comprises one or more selected from the group consisting of alkylamino-modified silicone, phenyl-modified silicone, and dimethiconol. <65> An oily hair cosmetic composition of any one of <62> to <64>, wherein component (D) comprises one or more selected from the group consisting of bisalkyl amodimethicone, diphenyl dimethicone, diphenylsiloxy phenyl trimethicone, triphenyldimethylvinyl disiloxane, and dimethiconol. <66> An oily hair cosmetic composition of any one of <62> to <65>, wherein component (D) comprises one or more selected from the group consisting of bisalkyl (C30-45) amodimethicone, diphenylsiloxy phenyl trimethicone, and dimethiconol. <67> An oily hair cosmetic composition according to any one of <61> to <65>, wherein component (D) comprises bisalkyl (C30-45) amodimethicone. <68> An oily hair cosmetic composition according to any one of <62> to <67>, wherein the content of component (D) in the oily hair cosmetic composition is preferably 0.1% by mass or more and 5% by mass or less. <69> An oily hair cosmetic composition according to any one of <62> to <68>, wherein the content of component (D) in the oily hair cosmetic composition is 0.3% by mass or more and 1% by mass or less.<70> The oily hair cosmetic composition according to any one of <1> to <69>, wherein the oily hair cosmetic composition contains component (C): an ester that is liquid at 25°C, which is an ester of a monovalent carboxylic acid having 3 to 25 carbon atoms and a monovalent to trivalent chain alcohol having 2 to 20 carbon atoms, and component (D): a modified silicone. <71> The oily hair cosmetic composition of <1> to <70>, wherein component (A) contains 0.001% by mass or more and 2% by mass of one or more selected from the group consisting of isopalmitic acid and isostearic acid; component (B) contains 20% by mass or more of one or more selected from the group consisting of isododecane and hydrogenated polyisobutene having 15 or less carbon atoms; component (C) contains 0.1% by mass or more and 15% by mass of one or more selected from the group consisting of glyceryl tri-2-ethylhexanoate, macadamia seed oil, alkyl benzoate (C12-15), and isopropyl palmitate; and component (D) contains 0.1% by mass or more and 5% by mass of one or more selected from the group consisting of bisalkyl (C30-45) amodimethicone, diphenylsiloxyphenyl trimethicone, and dimethiconol. <72> The oily hair cosmetic composition of <1> to <71>, wherein component (A) contains 0.001% by mass or more and 2% by mass of one or more selected from the group consisting of isopalmitic acid and isostearic acid; component (B) contains 40% by mass or more of one or more selected from the group consisting of isododecane and hydrogenated polyisobutene having 15 or less carbon atoms; component (C) contains 0.1% by mass or more and 15% by mass of one or more selected from the group consisting of glyceryl tri-2-ethylhexanoate, macadamia seed oil, alkyl benzoate (C12-15), and isopropyl palmitate; and component (D) contains 0.1% by mass or more and 5% by mass of one or more selected from the group consisting of bisalkyl (C30-45) amodimethicone, diphenylsiloxyphenyl trimethicone, and dimethiconol. <73> An oily hair cosmetic composition according to any one of <1> to <72>, wherein the water content in the oily hair cosmetic composition is 5% by mass or less. <74> An oily hair cosmetic composition according to any one of <1> to <73>, wherein the water content in the oily hair cosmetic composition is 1% by mass or less.<75> An oily hair cosmetic composition according to any one of <1> to <74>, wherein the water content in the oily hair cosmetic composition is 0.1% by mass or less. <76> An oily hair cosmetic composition according to any one of <1> to <75>, wherein the surfactant content in the oily hair cosmetic composition is 1% by mass or less. <77> An oily hair cosmetic composition according to any one of <1> to <76>, wherein the oily hair cosmetic composition contains 0.5% by mass or less of an oil that is solid or semi-solid at 25°C. <78> An oily hair cosmetic composition according to any one of <1> to <77>, wherein the film-forming polymer (excluding those corresponding to component (D)) content in the oily hair cosmetic composition is 1% by mass or less. <79> An oily hair cosmetic composition according to any one of <1> to <78>, wherein the powder content in the oily hair cosmetic composition is 0.1% by mass or less. <80> An oily hair cosmetic composition according to any one of <1> to <79>, which is liquid at room temperature (25°C). <81> An oily hair cosmetic set according to any one of <1> to <80>, which is used in a form in which the hair is dried without rinsing after application. <82> An oily hair cosmetic composition according to any one of <1> to <81>, wherein the product form of the oily hair cosmetic composition is a leave-in treatment, hair lotion, hair oil, or styling agent. <83> An oily hair cosmetic composition according to any one of <1> to <82>, wherein the product form of the oily hair cosmetic composition is hair oil. <84> A hair treatment method comprising the following steps (I) and (II) in order, wherein there is no step of rinsing the hair between step (I) and step (II). Step (I): Step of applying an oily hair cosmetic composition from any one of <1> to <83> to the hair. Step (II): Step of drying the hair to which the oily hair cosmetic composition has been applied. <85> The hair treatment method of <84>, wherein the hair preferably includes damaged hair with a history of chemical treatment. <86> The hair treatment method of <84>, wherein the hair includes damaged hair with a history of chemical treatment and repeated washing. <87> The hair treatment method of any one of <84> to <86>, wherein the amount of the oily hair cosmetic composition applied to the hair is 0.001 or more and 0.5 or less in mass ratio to the dry mass of the hair (mass of oily hair cosmetic composition / dry mass of hair).<88> A hair treatment method according to any one of <84> to <87>, wherein the amount of the oily hair cosmetic composition applied to the hair is 0.01 or more and 0.1 or less in mass ratio to the dry mass of the hair (mass of oily hair cosmetic composition / dry mass of hair).

[0065] The present invention will be specifically described below with reference to examples, but the present invention is not limited in any way by these examples. In the following examples and comparative examples, "parts" and "%" refer to "parts by mass" and "mass%" unless otherwise specified. The evaluation in these examples was carried out by the following method.

[0066] <Preparation of hair bundles for evaluation> (1) Preparation of non-chemically treated hair bundles Using Japanese hair with no history of chemical treatment and almost no frizz, untreated hair bundles (non-chemically treated hair bundles) measuring 30 cm in length, 4 cm in width, and 20 g in mass were prepared. (2) Preparation of damaged hair bundles The non-chemically treated hair bundles were bleached once with powder bleach and then colored once with hair color using the method described below. Furthermore, damaged hair bundles for evaluation were prepared by repeatedly washing the hair using the method described below.

[0067] (Treatment with powder bleach) Ordeve Addicthy High Bleach (Milbon Co., Ltd.) was used as the first agent (powder), and Ordeve Addicthy Oxidant 6.0% (Milbon Co., Ltd.) was used as the second agent. The first agent and the second agent were mixed in a mass ratio of 1:2 to prepare the powder bleach. Hair strands: The powder bleach was applied to non-chemically treated hair strands so that the bath ratio of the powder bleach was 1:3, and left for 30 minutes in an environment of 25°C and relative humidity of 40 RH. After 30 minutes, the hair strands were wet with 40°C tap water for 30 seconds, 1 g of plain shampoo with the composition below was applied, lathered for 30 seconds, and rinsed with 40°C tap water for 30 seconds. Next, 2 g of plain conditioner with the composition below was applied to the hair strands, rinsed with 40°C tap water for 30 seconds, and excess water was removed with a towel. Furthermore, I dried my hair for 5 minutes using a hair dryer (Panasonic EH NE23, turbo mode, hair surface temperature 60°C), while lightly running my fingers through it.

[0068] (Treatment with hair colorant) Topsick 10nT (manufactured by Goldwell Japan) was used as the first agent, and Topsick N60 (manufactured by Goldwell Japan) was used as the second agent. The first agent and the second agent were mixed in a mass ratio of 1:2 to prepare the hair colorant. Hair strands: The hair colorant was applied to hair strands that had been treated with powder bleach so that the bath ratio of the hair colorant was 1:2, and left for 30 minutes in an environment of 25°C and relative humidity of 40 RH. After 30 minutes, the hair strands were wet with 40°C tap water for 30 seconds, 1 g of plain shampoo with the composition below was applied, lathered for 30 seconds, and rinsed with 40°C tap water for 30 seconds. Next, 2 g of plain conditioner with the composition below was applied to the hair strands, rinsed with 40°C tap water for 30 seconds, and excess water was removed with a towel. Furthermore, I dried my hair for 5 minutes using a hair dryer (Panasonic EH NE23, turbo mode, hair surface temperature 60°C), while lightly running my fingers through it.

[0069] (Repeated hair washing treatment) After treatment with the hair coloring agent, the hair strands were wet with 40°C tap water for 30 seconds, 1g of the plain shampoo was applied and lathered for 30 seconds, and then rinsed with 40°C tap water for 30 seconds. Next, 2g of plain conditioner with the following composition was applied and rinsed with 40°C tap water for 30 seconds, excess water was removed with a towel, and the hair was dried with a hair dryer (Panasonic EH NE23, turbo mode, hair surface temperature 60°C) for 5 minutes, while lightly running fingers through the hair. This process was repeated 30 times.

[0070] [Plain Shampoo Composition] *The amount is the amount of active ingredients. (Mass %) Polyoxyethylene (2.0) lauryl ether sulfate sodium (*1) 47.2 Lauric acid diethanolamide (*2) 2.5 Sodium benzoate 1.1 Sodium chloride 1.2 Ion-exchanged water 86.6 Total 100.0 (*1) 47.2 mass% as Kao Corporation's "Emal 227" (active ingredient amount 27 mass%) (*2) Aminone C-11S (manufactured by Kao Corporation), active ingredient amount 100 mass%

[0071] [Composition of Plain Conditioner] *The amount is the amount of active ingredient. (Mass %) Cetyltrimethylammonium chloride (*1) 5.0 Cetyl alcohol (*2) 5.0 Lactic acid 2.0 Water balance total 100.0 (*1) Kao Corporation "Cotamin 60W" (*2) Kao Corporation "Calcol 6098"

[0072] <Effect of restoring the storage elasticity of damaged hair> (1) Preparation of non-chemically treated hair samples and pre-treatment damaged hair samples Five strands of hair were randomly cut from the evaluation hair bundle (the non-chemically treated hair bundle or damaged hair bundle) at a length of 5 cm from 1 cm from the root toward the tip to obtain non-chemically treated hair samples and pre-treatment damaged hair samples.

[0073] (2) Preparation of damaged hair samples after treatment The hair bundles for evaluating the damaged hair bundles were wet with 40°C tap water for 30 seconds, 1 g of the plain shampoo was applied and lathered for 30 seconds, and then rinsed with 40°C tap water for 30 seconds. Next, 2 g of the plain conditioner was applied and rinsed with 40°C tap water for 30 seconds, and excess water was removed with a towel. Next, 0.4 g of each example of the oily hair cosmetic composition was applied to the towel-dried damaged hair bundles, and the hair bundles were run through with fingers 10 times from the roots to the ends to distribute the product evenly. Next, the hair bundles were dried with a hair dryer (Panasonic EH NE23, turbo mode, hair surface temperature 60°C) for 30 seconds while running fingers through them from the roots to the ends at a speed of 30 cm / second. Next, five strands of hair, each 5 cm long, were randomly cut from 1 cm from the root of the hair bundle towards the tip to obtain damaged hair samples after chemical treatment.

[0074] (3) Measurement of Storage Modulus Each hair sample obtained (untreated hair sample, damaged hair sample before treatment, and damaged hair sample after treatment) was left to acclimate for 24 hours in an environment of 20°C and 65% RH relative humidity. Then, using a rheometer (Anton Paar modular compact rheometer MCR302), the viscoelasticity of each hair was measured under the following conditions, and the storage modulus was measured and the average value was calculated. • Frequency: 1.0 Hz • Elongation stress (σ): 5 MPa

[0075] Next, the recovery rate of the storage modulus was calculated using the following formula based on the obtained average values. Note that the closer the value is to 100, the closer the hair, hardened by damage, approaches the softness of the hair before damage (non-chemical treatment).

[0076] The recovery rate of the storage modulus of damaged hair (%) = (P - Q) / (P - R) × 100 [In this formula, P represents the storage modulus of the damaged hair sample before treatment, Q represents the storage modulus of the damaged hair sample after treatment, and R represents the storage modulus of the untreated hair sample.]

[0077] <Smoothness of combing after drying> Evaluation hair bundles (the non-chemically treated hair bundles or damaged hair bundles) were wet with 40°C tap water for 30 seconds, 1 g of the plain shampoo was applied and lathered for 30 seconds, and then rinsed with 40°C tap water for 30 seconds. Next, 2 g of the plain conditioner was applied and rinsed with 40°C tap water for 30 seconds, and excess water was removed with a towel. 0.4 g of each example of the oily hair cosmetic composition was applied to the towel-dried hair bundles (non-chemically treated hair bundles and damaged hair bundles respectively), and the hair bundles were run through with fingers 10 times from the roots to the ends to distribute the product evenly. The hair bundles were dried with a hair dryer (Panasonic EH NE23, turbo mode, hair surface temperature 60°C) while running fingers through them from the roots to the ends at a speed of 30 cm / second. Five expert panelists conducted a sensory evaluation of the smoothness of the hair during the first three minutes of drying, according to the following criteria. The average of the five panelists' scores was calculated and is shown in the table. In the criteria below, Example 1 was given a score of 3 for smoothness of hair during drying, which is better than the conventional product, and most of the other examples performed even better. A higher score indicates superior smoothness of hair during drying.

[0078] (Evaluation Criteria) Score 5: Much smoother than Example 1 4: Slightly smoother than Example 1 3: About the same smoothness as Example 1 2: Slightly worse than Example 1 1: Much worse than Example 1

[0079] <Softness of damaged hair after drying> Using the method described in "Ease of combing during drying," each example of the oily hair cosmetic composition was applied to towel-dried damaged hair strands, and then dried with a hairdryer for 5 minutes. Five expert panelists performed a sensory evaluation of the softness of the hair strands after drying according to the following criteria. The average of the scores from the five panelists was calculated and is shown in the table. In the following criteria, the softness of damaged hair in Example 1 was given a score of 3, which is better than conventional products, and most of the other examples performed even better. A higher score indicates superior softness of damaged hair.

[0080] (Evaluation Criteria) Score 5: Much softer than Example 1 4: Slightly softer than Example 1 3: About the same softness as Example 1 2: Softer than damaged hair, but slightly harder than Example 1 1: About the same as damaged hair, or harder than damaged hair

[0081] <Uniformity of Softness between Damaged Hair and Non-Chemically Treated Hair> Using the method described in "Ease of Combing During Drying," the oily hair cosmetic compositions of each example were applied to towel-dried non-chemically treated hair bundles and damaged hair bundles, and then dried with a hairdryer for 5 minutes. Five expert panelists performed a sensory evaluation of the uniformity of softness between the damaged hair and non-chemically treated hair after drying, according to the following criteria. The average of the scores from the five panelists was calculated and is shown in the table.

[0082] (Evaluation Criteria) Score 4: There is almost no difference in softness between the damaged hair bundle after treatment and the untreated hair bundle after treatment; it is uniform. 3: Compared to the difference in softness between the damaged hair bundle before treatment and the untreated hair bundle before treatment, the difference in softness between the damaged hair bundle after treatment and the untreated hair bundle after treatment is clearly smaller. 2: Compared to the difference in softness between the damaged hair bundle before treatment and the untreated hair bundle before treatment, the difference in softness between the damaged hair bundle after treatment and the untreated hair bundle after treatment is slightly smaller. 1: Compared to the difference in softness between the damaged hair bundle before treatment and the untreated hair bundle before treatment, the difference in softness between the damaged hair bundle after treatment and the untreated hair bundle after treatment is equal to or greater than that.

[0083] <Lack of stickiness after drying> Using the method described in "Ease of combing during drying," the oily hair cosmetic compositions of each example were applied to towel-dried, non-chemically treated hair bundles and damaged hair bundles, and then dried with a hairdryer for 5 minutes. Five expert panelists performed a sensory evaluation of the lack of stickiness of the hair bundles according to the following criteria. The average of the scores from the five panelists was calculated and is shown in the table. In the following criteria, Example 1 was given a score of 3 for lack of stickiness after drying, which is better than conventional products, and most of the other examples performed even better. A higher score indicates less stickiness.

[0084] (Evaluation Criteria) Score 5: No stickiness at all 4: Slightly less sticky than Example 1 3: About the same level of non-stickiness as Example 1 2: Slightly stickier than Example 1, but within acceptable limits 1: Very sticky

[0085] Examples 1-21, Comparative Examples 1-4 (Preparation and Evaluation of Oily Hair Cosmetic Compositions) Each component listed in the table was weighed into a 100 mL beaker containing a stirring bar, and stirred and mixed until uniform to obtain the oily hair cosmetic composition (hair oil) described in the table below. The oily hair cosmetic compositions obtained in Example 1 and Comparative Example 1 were evaluated for "restoration effect of storage elastic modulus of damaged hair after drying" and "softness of damaged hair after drying." The results are shown in Table 1. Furthermore, the oily hair cosmetic compositions obtained in Examples 1-21 and Comparative Examples 1-4 were evaluated for "ease of combing after drying," "softness of damaged hair after drying," "uniformity of softness between damaged hair and non-chemically treated hair after drying," and "lack of stickiness after drying." The results are shown in Tables 2-6. The amounts (mass%) listed in the tables represent the amount of active ingredient (active%) of each component. In the table, fatty acids that do not fall under component (A) are labeled as "Component (A')", and hydrocarbons that do not fall under component (B) are labeled as "Component (B')".

[0086]

[0087] Table 1 shows that the oily cosmetic composition (hair oil) of Example 1, which contains isostearic acid as component (A), has approximately twice the recovery rate of the storage elasticity of damaged hair compared to the hair oil of Comparative Example 1 (corresponding to the example in Patent Document 1), which contains a fatty acid that is solid at 25°C (A') and does not correspond to component (A). This indicates that the storage elasticity of hair damaged by chemical treatment can be significantly restored. Furthermore, in the sensory evaluation of the softness of damaged hair, Example 1 was found to be superior to Comparative Example 1. From these results, a correlation was observed between the physicochemical evaluation of the recovery rate of the storage elasticity of damaged hair and the sensory evaluation of the softness of damaged hair, and it was confirmed that there was a significant difference in the evaluation of softness of damaged hair between Example 1 and Comparative Example 1.

[0088]

[0089]

[0090]

[0091]

[0092]

[0093] Tables 2-6 show that the oily cosmetic composition (hair oil) of this embodiment provides smooth handling when dry, regardless of whether it is applied to untreated or damaged hair. It can also impart softness to damaged hair, and the difference in softness between untreated and damaged hair after application of the oily cosmetic composition is small, and there is also less stickiness after drying. Furthermore, a comparison of Example 4 in Table 5 with Examples 12-15 shows that the smooth handling when dry is further improved when the hair oil contains component (C), and a comparison of Examples 4, 12-15 in Table 5 with Examples 19-21 in Table 6 shows that when the hair oil contains components (C) and (D), the smooth handling when dry and the reduced stickiness after drying are further improved for both untreated and damaged hair.

[0094] In contrast, Comparative Example 1 hair oil (equivalent to the example in Patent Document 1), which contains component (A'), a fatty acid that is solid at 25°C, instead of component (A), scored lower than Example 1, except for the lack of stickiness on non-chemically treated hair after drying. Furthermore, component (A') had low solubility in component (B), and precipitation was observed several hours after hair oil preparation. Comparative Example 2 hair oil (equivalent to the example in Patent Document 2), which contained more than 2% by mass of component (A), and Comparative Example 3 hair oil, which contained component (B') instead of component (B), performed worse than Example 1 in all items. In addition, Comparative Example 4 hair oil, which contained less than 20% by mass of component (B) (part of component (B) was replaced with ethanol), showed the same lack of stickiness after drying as Examples 9-11, but scored lower than Examples 9-11 in other items. This is thought to be because the amount of component (B), which is a carrier for component (A), was low, preventing component (A) from penetrating sufficiently into the damaged hair.

[0095] The present invention further discloses the following formulation examples. Formulation Example 1 (Hair Oil) (Ingredient Name) (Mass %) Isostearic Acid 0.5 Isododecane (Maruzen Petrochemical Co., Ltd., Marcazole R) 41 Hydrogenated Polyisobutene (NOF Co., Ltd., Pearl Ream 3) 2 Argania Spinosa Kernel Oil 1 Jojoba Seed Oil 1 Macadamia Seed Oil 1 Isocetyl Myristate 5 Bis-Alkyl (C30-45) Amodimethicone 0.5 Dimethiconol 6 Dimethicone 20CS 24 Dimethicone 10 Hydrogenated Polydecene 10 (Total) 100

[0096] Formula Example 2 (Hair Oil) (Ingredient Name) (Mass %) Isostearic Acid 0.5 Isododecane (Marukazol R, manufactured by Maruzen Petrochemical Co., Ltd.) 75.8 Argania Spinosa Kernel Oil 0.1 Crambe Abyssinica Seed Oil 0.1 Adansonia Digitata Seed Oil 0.1 Triethylhexanoin 1 Isononyl Isononanoate 5 Bis-Alkyl (C30-45) Amodimethicone 0.3 Dimethiconol 2 Dimethicone 20CS 8 Dimethicone 6CS 1.8 Dimethicone 3.5 Polysilicone-9 0.2 Diphenylsiloxy Phenylen Trimethicone 0.1 Squalane 1 Ethanol 0.5 (Total) 100

[0097] Formula Example 3 (Hair Oil) (Ingredient Name) (Mass %) Isostearic Acid 2 Isododecane (Marukazol R, manufactured by Maruzen Petrochemical Co., Ltd.) 79.55 Argania Spinosa Kernel Oil 0.1 Crambe Abyssinica Seed Oil 0.1 Adansonia Digitata Seed Oil 0.1 Isopropyl Myristate 1 Isononyl Isononanoate 3 Dimethiconol 2 Dimethicone 20CS 8 Aminopropyl Dimethicone 4 Honey 0.05 Ethanol 0.1 (Total) 100

[0098] Formula Example 4 (Hair Oil) (Ingredient Name) (Mass %) Isostearic Acid 1 Hydrogenated Polyisobutene (NOF Co., Ltd., Pearl Ream 3) 89.35 Argania Spinosa Kernel Oil 0.1 Isononyl Isononanoate 3 Bis-Alkyl (C30-45) Amodimethicone 0.5 Dimethicone 5CS 1 Dimethicone 5-Methoxycinnamate Ethylhexyl 0.05 (Total) 100

[0099] Formula Example 5 (Hair Oil) (Ingredient Name) (Mass %) Isostearic Acid 0.2 Hydrogenated Polyisobutene (NOF Co., Ltd., Pearl Ream 3) 58.4 Crambe Abyssinica Seed Oil 0.1 Adansonia Digitata Seed Oil 0.1 Triethylhexanoin 2.5 Cetyl Ethylhexanoate 3 Dimethicone 30 Dimethicone 10CS 5 Squalane 0.1 Dicaprylyl Ether 0.1 Di(Octyldodecyl / Phytosteryl / Behenyl) Lauroyl Glutamate 0.5 (Total) 100

[0100] Formula Example 6 (Hair Oil) (Ingredient Name) (Mass %) Isostearic Acid 1 Hydrogenated Polyisobutene (NOF Co., Ltd., Pearl Ream 3) 50.45 Soybean Oil 2 Sunflower Seed Oil 0.2 Triethylhexanoin 10 Isononyl Isononanoate 5 Cetyl Ethylhexanoate 1 Dimethiconol 0.36 Dimethicone 2.64 Caprylyl Methicone 15 Diphenylsiloxy Phenylen Trimethicone 2 Mineral Oil (Kaneda Co., Ltd., Hycol K-350) 10 Panthenol 0.1 Ethylhexyl Methoxycinnamate 0.05 Ethanol 0.2 (Total) 100

[0101] Formula Example 7 (Hair Oil) (Ingredient Name) (Mass %) Isostearic Acid 0.5 Isododecane (Maruzen Petrochemical Co., Ltd., Marcazole R) 10 Hydrogenated Polyisobutene (NOF Co., Ltd., Pearl Ream 3) 73.27 Macadamia Seed Oil 0.3 Baobab Seed Oil 0.02 Sunflower Seed Oil 0.01 Ethylhexyl Palmitate 0.2 Bis-Alkyl (C30-45) Amodimethicone 0.4 Dimethicone 5CS5 Dimethicone 10 POP(5) Phytosterol 0.1 Fragrance 0.2 (Total) 100

[0102] Formula Example 8 (Hair Oil) (Ingredient Name) (Mass %) Isostearic Acid 0.5 Isododecane (Maruzen Petrochemical Co., Ltd., Marcazole R) 72.96 Argania Spinosa Kernel Oil 0.1 (Acrylates / Dimethicone) Copolymer 2 (Bis-Isobutyl PEG-15 / Amodimethicone) Copolymer 0.5 Dimethicone 1 Trimethylsiloxysilicate 2.5 Behentrimonium Chloride 0.12 Steartrimonium Chloride 0.12 Ethanol 20.2 (Total) 100

[0103] According to the present invention, it is possible to impart softness to damaged hair with a history of chemical treatment, and even when applied to hair containing a mixture of healthy hair without a history of chemical treatment and the aforementioned damaged hair, a uniform softness can be obtained throughout the hair, the hair is easy to comb through when drying, and the hair is less sticky after drying.

Claims

1. An oily hair cosmetic composition comprising the following components (A) and (B): (A) a branched-chain fatty acid that is liquid at 25°C and (B) a branched-chain hydrocarbon having 15 or fewer carbon atoms, wherein the content of component (A) in the composition is 0.001% by mass or more and 2% by mass or less, and the content of component (B) in the composition is 20% by mass or more.

2. The oily hair cosmetic composition according to claim 1, wherein component (A) contains a branched-chain fatty acid having 12 to 20 carbon atoms.

3. The oily hair cosmetic composition according to claim 1 or 2, wherein component (A) comprises one or more selected from the group consisting of isopalmitic acid and isostearic acid.

4. The oily hair cosmetic composition according to any one of claims 1 to 3, wherein component (B) comprises one or more selected from the group consisting of isododecane and hydrogenated polyisobutene having 15 or fewer carbon atoms.

5. The oily hair cosmetic composition according to any one of claims 1 to 4, wherein the mass ratio of component (B) to component (A) [(B) / (A)] is 10 or more and 2000 or less.

6. The oily hair cosmetic composition according to any one of claims 1 to 5, further comprising component (C): an ester that is liquid at 25°C, comprising an ester of a monovalent carboxylic acid having 3 to 25 carbon atoms and a monovalent to trivalent chain alcohol having 2 to 20 carbon atoms.

7. The oily hair cosmetic composition according to claim 6, wherein component (C) comprises one or more selected from the group consisting of a triester of a fatty acid having 8 to 25 carbon atoms and glycerin, an ester of a monovalent aromatic carboxylic acid having 7 to 25 carbon atoms and a monovalent chain alcohol having 8 to 20 carbon atoms, and an ester of a fatty acid having 8 to 25 carbon atoms and a monovalent chain alcohol having 2 to 20 carbon atoms.

8. The oily hair cosmetic composition according to claim 6 or 7, wherein component (C) comprises one or more selected from the group consisting of glyceryl tri-2-ethylhexanoate, macadamia seed oil, alkyl benzoate (C12-15), and isopropyl palmitate.

9. The oily hair cosmetic composition according to any one of claims 6 to 8, wherein the mass ratio of component (C) to component (A) [(C) / (A)] is 0.1 or more and 200 or less.

10. The oily hair cosmetic composition according to any one of claims 6 to 9, wherein component (A) contains 0.001% by mass or more and 2% by mass of one or more selected from the group consisting of isopalmitic acid and isostearic acid; component (B) contains 40% by mass or more of one or more selected from the group consisting of isododecane and hydrogenated polyisobutene having 15 or less carbon atoms; and component (C) contains 0.1% by mass or more and 15% by mass of one or more selected from the group consisting of glyceryl tri-2-ethylhexanoate, macadamia seed oil, alkyl benzoate (C12-15), and isopropyl palmitate.

11. The oily hair cosmetic composition according to any one of claims 1 to 10, further comprising component (D): modified silicone.

12. The oily hair cosmetic composition according to claim 11, wherein component (D) comprises one or more selected from the group consisting of bisalkyl (C30-45) amodimethicone, diphenylsiloxyphenyl trimethicone, and dimethiconol.

13. The oily hair cosmetic composition according to any one of claims 1 to 12, wherein the water content in the oily hair cosmetic composition is 5% by mass or less.

14. A hair treatment method, the method comprising the following steps (I) and (II) in order, wherein there is no step of rinsing the hair between step (I) and step (II). Step (I) Step (II): Step of applying the oily hair cosmetic composition described in any one of claims 1 to 13 to the hair. Step (II): Step of drying the hair to which the oily hair cosmetic composition has been applied.

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