Cosmetic composition and hair treatment method

Abstract

To provide a liquid cosmetic composition that includes an oil-based component and shows improved stability at low temperatures; and to provide a hair treatment method using a liquid cosmetic composition with improved stability at low temperatures.SOLUTION: A liquid cosmetic composition includes a polyhydric alcohol including isopentyl diol and / or dipropylene glycol, a monovalent lower alcohol, a cationic surfactant and a higher alcohol. There is also provided a hair treatment method using the cosmetic composition.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a cosmetic composition and a hair treatment method.

Background Art

[0002] Cosmetic compositions containing various components are provided for the purpose of imparting various functions to hair and skin. In addition, cosmetic compositions are available in various dosage forms.

[0003] As an example of a cosmetic composition containing various components, Patent Document 1 below proposes a cosmetic composition characterized by containing one or more kinds of dimethyldiallylammonium chloride derivatives and one or more kinds selected from cation-modified fenugreek gum, cation-modified tara gum, and cation-modified locust bean gum, together with various dosage forms. The cosmetic composition of Patent Document 1 is disclosed to have excellent foaming power, good adsorbability to hair and skin, and to bring about a good conditioning effect (Claim 1, Examples, etc.).

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] Cosmetic compositions exist in various dosage forms such as liquid, cream, and solid. Among them, liquid cosmetic compositions have a relatively low viscosity compared to cream and solid forms, so the cosmetic composition spreads easily on hair and skin, and uniform application becomes easy.

[0006] Oily components are sometimes used in liquid cosmetic compositions to impart various functions to hair and skin, such as moisturizing properties and improved texture. However, liquid cosmetic compositions containing oily components can easily become cloudy or precipitate when stored at low temperatures for a certain period, resulting in changes in appearance.

[0007] Changes in the appearance of liquid cosmetic compositions due to low-temperature storage are undesirable from a quality control standpoint. Furthermore, such changes in appearance can cause anxiety among consumers. Therefore, improving the low-temperature stability of cosmetic compositions is desirable to mitigate these changes in appearance during low-temperature storage.

[0008] In view of the above circumstances, an object of the present invention is to improve the low-temperature stability of a liquid cosmetic composition containing an oily component. Another object of the present invention is to provide a hair treatment method using a liquid cosmetic composition with improved low-temperature stability. [Means for solving the problem]

[0009] Through diligent research, the inventors discovered that low-temperature stability can be improved in a liquid cosmetic composition containing a higher alcohol as an oily component, if it also contains a polyhydric alcohol including isopentyl diol and / or dipropylene glycol, a monohydric lower alcohol, and a cationic surfactant. This led to the completion of the present invention.

[0010] [1] The cosmetic composition is a liquid cosmetic composition containing a polyhydric alcohol including isopentyl diol and / or dipropylene glycol, a monohydric lower alcohol, a cationic surfactant, and a higher alcohol.

[0011] The cosmetic composition of [2] is the cosmetic composition of [1], wherein the amount of polyhydric alcohol containing isopentyl diol and / or dipropylene glycol is 60% by mass or more, and the mass ratio of the amount of higher alcohol to the amount of monohydric lower alcohol is 0.15 or less.

[0012] The cosmetic composition of [3] is the cosmetic composition of [1] or [2], wherein the amount of polyhydric alcohol containing isopentyl diol and / or dipropylene glycol is 60% by mass or more, and the mass ratio of the total amount of isopentyl diol and / or dipropylene glycol to the amount of polyhydric alcohol containing isopentyl diol and / or dipropylene glycol is 0.4 or more and 1 or less.

[0013] The cosmetic composition of [4] is any of the cosmetic compositions of [1] to [3], wherein the amount of polyhydric alcohol containing isopentyl diol and / or dipropylene glycol is 60% by mass or more and 85% by mass or less, the amount of monohydric lower alcohol is 10% by mass or more and 30% by mass or less, the amount of cationic surfactant is 0.1% by mass or more and 5% by mass or less, and the amount of higher alcohol is 0.1% by mass or more and 1.6% by mass or less.

[0014] The cosmetic composition of [5] is any of the cosmetic compositions of [1] to [4], which either do not contain water, or contain water, with a water content of 10% by mass or less.

[0015] The hair treatment method in [6] is a hair treatment method using any of the cosmetic compositions in [1] to [5]. [Effects of the Invention]

[0016] The present invention provides a cosmetic composition with improved low-temperature stability. Furthermore, the present invention provides a hair treatment method using the present cosmetic composition. [Brief explanation of the drawing]

[0017] [Figure 1] DSC charts of the cosmetic compositions of Examples 1 to 3 and Comparative Examples 1 to 3. [Figure 2] DSC chart of the cosmetic composition of Comparative Example 4. [Figure 3] DSC charts of the cosmetic compositions of Examples 4 and 5 and Comparative Examples 5 to 8. [Embodiments for Carrying Out the Invention]

[0018] Based on an embodiment of the present invention (hereinafter referred to as this embodiment), the present invention will be described below.

[0019] [Cosmetic Composition] The cosmetic composition of this embodiment is a liquid cosmetic composition containing a polyhydric alcohol containing isopentyl diol and / or dipropylene glycol, a monohydric lower alcohol, a cationic surfactant, and a higher alcohol. According to the cosmetic composition of the present invention, a cosmetic composition with improved low-temperature stability can be provided.

[0020] In the cosmetic composition of this embodiment, "improvement of low-temperature stability" means that the change in the appearance of the cosmetic composition due to low-temperature storage is small. Examples of the change in the appearance of the cosmetic composition due to low-temperature storage include that the cosmetic composition that was transparent before low-temperature storage becomes turbid or precipitates due to low-temperature storage, or that the cosmetic composition that was turbid before low-temperature storage becomes more turbid or precipitates due to low-temperature storage. The "low temperature" in low-temperature stability is the temperature suitable for the evaluation when evaluating the change in the appearance of the cosmetic composition due to low-temperature storage (for example, in the range of -2°C to -10°C, etc.), for example, -10°C.

[0021] [Polyhydric Alcohol Containing Isopentyl Diol and / or Dipropylene Glycol] The cosmetic composition of this embodiment contains a polyhydric alcohol containing isopentyl diol and / or dipropylene glycol. The polyhydric alcohol containing isopentyl diol and / or dipropylene glycol is a solvent for the cationic surfactant and higher alcohol blended in the cosmetic composition of this embodiment. Note that "and / or" means both or either one of them.

[0022] The polyhydric alcohol containing isopentyl diol and / or dipropylene glycol means a polyhydric alcohol that essentially contains at least either one or both of isopentyl diol and dipropylene glycol.

[0023] In the following description, isopentyl diol may be denoted as "IPG", dipropylene glycol may be denoted as "DPG", and the polyhydric alcohol containing isopentyl diol and / or dipropylene glycol may be denoted as "polyhydric alcohol containing IPG and / or DPG".

[0024] The cosmetic composition of this embodiment may contain only IPG or only DPG as the polyhydric alcohol containing IPG and / or DPG, may contain only two types of IPG and DPG, may contain IPG and / or DPG, and may further contain one or more types of polyhydric alcohols other than IPG and DPG (hereinafter, polyhydric alcohols other than IPG and DPG may be denoted as "other polyhydric alcohols").

[0025] As the polyhydric alcohol containing IPG and / or DPG formulated in the cosmetic composition of this embodiment, for example, a polyhydric alcohol having 2 to 24 carbon atoms can be used.

[0026] As the polyhydric alcohol containing IPG and / or DPG formulated in the cosmetic composition of this embodiment, for example, a polyhydric alcohol having 2 to 6 hydroxyl groups can be used.

[0027] As the polyhydric alcohol containing IPG and / or DPG incorporated into the cosmetic composition of this embodiment, for example, a polyhydric alcohol that is liquid at 25°C can be used. Note that "polyhydric alcohol that is liquid at 25°C" refers to a polyhydric alcohol that is fluid at 25°C.

[0028] The aforementioned isopentyl diol (also known as 3-methyl-1,3-butanediol) is a divalent polyhydric alcohol with 5 carbon atoms.

[0029] The aforementioned dipropylene glycol is a divalent polyhydric alcohol having 6 carbon atoms.

[0030] The aforementioned other polyhydric alcohols are not particularly limited, but examples include ethylene glycol, propylene glycol (1,2-propanediol), 1,3-propanediol, glycerin, 1,3-butylene glycol, diethylene glycol, pentylene glycol, diglycerin, hexanediol, octanediol, tripropylene glycol, polyglycerin-3, polyethylene glycol 300, polyethylene glycol 400, polyethylene glycol 600, and the like.

[0031] When the cosmetic composition of this embodiment contains other polyhydric alcohols, it is preferable to use one or more selected from propylene glycol, glycerin, and 1,3-butylene glycol as the other polyhydric alcohols, from the viewpoint of providing superior smoothness to the hair.

[0032] The lower limit of the amount of polyhydric alcohol containing IPG and / or DPG incorporated into the cosmetic composition of this embodiment is preferably 60% by mass or more, and more preferably 65% ​​by mass or more, from the viewpoint of improving the transparency of the appearance of the cosmetic composition. Furthermore, "amount of polyhydric alcohols including IPG and / or DPG" means the total amount of IPG, DPG, and other polyhydric alcohols blended into the cosmetic composition of this embodiment (the same meaning will be used in the following description).

[0033] The upper limit of the amount of polyhydric alcohol containing IPG and / or DPG incorporated into the cosmetic composition of this embodiment is preferably 90% by mass or less, and more preferably 85% by mass or less, from the viewpoint of providing superior smoothness to the hair.

[0034] The range of the amount of polyhydric alcohol containing IPG and / or DPG incorporated into the cosmetic composition of this embodiment is preferably 60% by mass or more and 90% by mass or less, and more preferably 65% ​​by mass or more and 85% by mass or less. The reason why these ranges are preferred is that the lower and upper limits of the amount of polyhydric alcohol containing IPG and / or DPG are the same as the viewpoint described above.

[0035] ([(Total amount of IPG and DPG) / (Amount of polyhydric alcohol containing IPG and / or DPG)] ratio) In this embodiment, the cosmetic composition has a mass ratio of the total amount of IPG and DPG to the amount of polyhydric alcohol containing IPG and / or DPG ([(total amount of IPG and DPG) / (amount of polyhydric alcohol containing IPG and / or DPG)] ratio) which is 0.4 or more and 1 or less, from the viewpoint of enabling further improvement of low-temperature stability. The "total amount of IPG and DPG" mentioned above refers to the total amount of IPG and DPG blended in the cosmetic composition of this embodiment (the same meaning will be used in the following description).

[0036] (Monovalent lower alcohol) The cosmetic composition of this embodiment contains one or more monohydric lower alcohols. The monohydric lower alcohols are solvents for the cationic surfactant and higher alcohols incorporated into the cosmetic composition of this embodiment.

[0037] As the aforementioned monohydric lower alcohol, a monohydric alcohol having 2 to 4 carbon atoms can be used. The monohydric alcohol having 2 to 4 carbon atoms may be a linear alcohol or a branched alcohol.

[0038] Examples of the aforementioned monohydric lower alcohols include ethanol, propanol, isopropanol, and butanol.

[0039] In the cosmetic composition of this embodiment, ethanol is preferred as the monohydric lower alcohol to be incorporated, from the viewpoint of reducing irritating odor.

[0040] The lower limit of the amount of monohydric lower alcohol incorporated into the cosmetic composition of this embodiment is preferably 10% by mass or more, more preferably 15% by mass or more, even more preferably 18% by mass or more, and particularly preferably 20% by mass or more, from the viewpoint of achieving further improvement in low-temperature stability.

[0041] The upper limit for the amount of monohydric lower alcohol blended in the cosmetic composition of this embodiment is, for example, 40% by mass or less. Furthermore, from the viewpoint of reducing the risk of skin irritation, the upper limit of the amount of monohydric lower alcohol incorporated into the cosmetic composition of this embodiment is preferably 30% by mass or less, more preferably 28% by mass or less, and even more preferably 25% by mass or less.

[0042] The preferred range for the amount of monohydric lower alcohol blended in the cosmetic composition of this embodiment is 10% by mass or more and 30% by mass or less, more preferably 15% by mass or more and 28% by mass or less, and even more preferably 18% by mass or more and 25% by mass or less. The reason why these ranges are preferred is that the lower and upper limits of the amount of monohydric lower alcohol blended are based on the same considerations as described above.

[0043] In this embodiment, the cosmetic composition is such that, for example, the total amount of IPG and DPG is greater than the amount of monohydric lower alcohol.

[0044] ([(Amount of monohydric lower alcohol) / (Amount of polyhydric alcohol including IPG and / or DPG)] ratio) The cosmetic composition of this embodiment has a mass ratio of the amount of monohydric lower alcohol to the amount of polyhydric alcohol containing IPG and / or DPG ([(amount of monohydric lower alcohol) / (amount of polyhydric alcohol containing IPG and / or DPG)] ratio), for example, 0.1 to 2.5.

[0045] (Cationic surfactant) The cosmetic composition of this embodiment contains one or more cationic surfactants. Due to the inclusion of cationic surfactants, the cosmetic composition of this embodiment results in hair that feels soft to the touch when applied to the hair.

[0046] Examples of the cationic surfactant include quaternary ammonium salts having an alkyl group with 12 to 22 carbon atoms, or tertiary amine salts having an alkyl group with 12 to 22 carbon atoms. Examples of the salts include halogen salts and alkyl sulfates. The alkyl group may be linear or branched, and may be saturated or unsaturated.

[0047] Examples of quaternary ammonium salts having an alkyl group with 12 to 22 carbon atoms include mono-long-chain alkyl type quaternary ammonium salts (e.g., cetyltrimethylammonium chloride, stearyltrimethylammonium chloride, behenyltrimethylammonium chloride, behenyltrimethylammonium methylsulfate, etc.), di-long-chain alkyl type quaternary ammonium salts (e.g., dicocoyldimethylammonium chloride, distearyldimethylammonium chloride, etc.), and ethylene oxide (EO) addition type quaternary ammonium salts (e.g., PEG-2 oleammonium chloride, PEG-5 stearylammonium chloride, etc.). Examples of tertiary amine salts having an alkyl group with 12 to 22 carbon atoms include fatty acid amidoamines (e.g., dimethylaminopropyl stearate, etc.) and polyoxyethylene alkylamines (e.g., polyoxyethylene oleylamine, etc.).

[0048] As the cationic surfactant incorporated into the cosmetic composition of this embodiment, it is preferable to use a quaternary ammonium salt having an alkyl group with 12 to 22 carbon atoms, from the viewpoint of providing superior smoothness to the hair. Furthermore, as the cationic surfactant incorporated into the cosmetic composition of this embodiment, it is even more preferable to use a quaternary ammonium salt (more preferably behenyltrimethylammonium chloride) having an alkyl group with 20 or more carbon atoms, from the viewpoint of providing superior smoothness to the hair.

[0049] As the cationic surfactant incorporated into the cosmetic composition of this embodiment, from the viewpoint of providing superior smoothness to the hair, a combination of cetyltrimethylammonium chloride and stearyltrimethylammonium chloride, or a combination of cetyltrimethylammonium chloride and behenyltrimethylammonium chloride is preferred.

[0050] From the viewpoint of providing superior smoothness to the hair, the lower limit of the amount of cationic surfactant blended in the cosmetic composition of this embodiment is preferably 0.1% by mass or more, more preferably 0.3% by mass or more, and even more preferably 0.5% by mass or more.

[0051] From the viewpoint of reducing the risk of skin irritation, the upper limit of the amount of cationic surfactant blended in the cosmetic composition of this embodiment is preferably 5% by mass or less, more preferably 3% by mass or less, and even more preferably 1.5% by mass or less.

[0052] The range of the amount of cationic surfactant to be incorporated into the cosmetic composition of this embodiment is preferably 0.1% by mass or more and 5% by mass or less, more preferably 0.3% by mass or more and 3% by mass or less, and even more preferably 0.5% by mass or more and 1.5% by mass or less. The reason why these ranges are preferred is that the lower and upper limits of the amount of cationic surfactant are based on the same considerations as described above.

[0053] (High-grade alcohol) The cosmetic composition of this embodiment contains one or more higher alcohols. The inclusion of higher alcohols allows the cosmetic composition of this embodiment to impart an oily feel to the hair, scalp, and other skin when applied to these areas.

[0054] The higher alcohol incorporated into the cosmetic composition of this embodiment can be a monohydric alcohol having 12 to 22 carbon atoms. The monohydric alcohol having 12 to 22 carbon atoms may be a saturated or unsaturated higher alcohol, and may be a linear or branched higher alcohol.

[0055] The higher alcohol incorporated into the cosmetic composition of this embodiment may be a higher alcohol that is solid at 25°C, or a higher alcohol that is liquid at 25°C. "Higher alcohol that is solid at 25°C" refers to a higher alcohol with a melting point of 30°C or higher. "Higher alcohol that is liquid at 25°C" refers to a higher alcohol that is fluid at 25°C and has a melting point of less than 30°C.

[0056] Examples of the aforementioned higher alcohols include linear higher alcohols (e.g., myristyl alcohol, cetanol, oleyl alcohol, stearyl alcohol, behenyl alcohol, etc.) and branched higher alcohols (e.g., hexyldecanol, isocetyl alcohol, isostearyl alcohol, octyldodecanol, etc.).

[0057] Furthermore, from the viewpoint of providing hair with superior smoothness, it is more preferable to use a higher alcohol that is solid at 25°C as the higher alcohol incorporated into the cosmetic composition of this embodiment.

[0058] From the viewpoint of providing hair with superior smoothness, myristyl alcohol is more preferable as the higher alcohol incorporated into the cosmetic composition of this embodiment.

[0059] From the viewpoint of providing superior smoothness to the hair, the lower limit of the amount of higher alcohol blended in the cosmetic composition of this embodiment is preferably 0.1% by mass or more, more preferably 0.3% by mass or more, and even more preferably 0.5% by mass or more.

[0060] From the viewpoint of achieving further improvement in low-temperature stability, the upper limit of the amount of higher alcohol blended in the cosmetic composition of this embodiment is preferably 2% by mass or less, and more preferably 1.5% by mass or less.

[0061] The preferred range for the amount of higher alcohol blended in the cosmetic composition of this embodiment is 0.1% by mass or more and 2% by mass or less, more preferably 0.5% by mass or more and 1.5% by mass or less, and even more preferably 0.5% by mass or more and 1.5% by mass or less. The reason these ranges are preferred is that the lower and upper limits of the amount of higher alcohol blended are based on the same considerations as described above.

[0062] ([(Amount of higher alcohol) / (Amount of monovalent lower alcohol)] ratio) In this embodiment, from the viewpoint of achieving further low-temperature stability, the upper limit of the mass ratio of the amount of higher alcohol to the amount of monohydric lower alcohol ([(total amount of higher alcohol) / (amount of monohydric lower alcohol)] ratio) is preferably 0.15 or less, more preferably 0.13 or less, and even more preferably 0.12 or less. Furthermore, the lower limit of the [(total amount of higher alcohol) / (amount of monohydric lower alcohol)] ratio in this embodiment is, for example, 0.01 or more.

[0063] ([(Amount of cationic surfactant) / (Amount of higher alcohol)] ratio) In this embodiment, the cosmetic composition has a mass ratio of the amount of cationic surfactant to the amount of higher alcohol ([(amount of cationic surfactant) / (amount of higher alcohol)] ratio) of 0.1 to 5, which is desirable for achieving further low-temperature stability.

[0064] (Total amount of cationic surfactant and higher alcohol) In this embodiment, from the viewpoint of achieving further low-temperature stability, the upper limit of the total amount of cationic surfactant and higher alcohol (total amount of cationic surfactant and higher alcohol) is preferably 5% by mass or less, more preferably 3.5% by mass or less, and even more preferably 3% by mass or less. Furthermore, in this embodiment, the lower limit of the total amount of cationic surfactant and higher alcohol is, for example, 0.2% by mass or more.

[0065] Furthermore, if the cosmetic composition of this embodiment contains at least a higher alcohol that is solid at 25°C as a higher alcohol and a quaternary ammonium salt having an alkyl group with 20 or more carbon atoms as a cationic surfactant, from the viewpoint of achieving further low-temperature stability, the upper limit of the total amount of cationic surfactant and higher alcohol (total amount of cationic surfactant and higher alcohol) is preferably 3.5% by mass or less, and more preferably 3% by mass or less. Also, in the case of the cosmetic composition of this embodiment as described above, the lower limit of the total amount of cationic surfactant and higher alcohol is, for example, 0.2% by mass or more.

[0066] ([(Total amount of cationic surfactant and higher alcohol) / (Amount of monohydric lower alcohol)] ratio) From the viewpoint of achieving further low-temperature stability, the cosmetic composition of this embodiment preferably has an upper limit of 0.15 or less for the mass ratio of the total amount of cationic surfactant and higher alcohol to the amount of monohydric lower alcohol ([(total amount of cationic surfactant and higher alcohol) / (amount of monohydric lower alcohol)] ratio). Furthermore, the lower limit of the [(total amount of cationic surfactant and higher alcohol) / (amount of monohydric lower alcohol)] ratio of the cosmetic composition of this embodiment is, for example, 0.005 or more.

[0067] Furthermore, if the cosmetic composition of this embodiment contains at least a higher alcohol that is solid at 25°C as a higher alcohol and a quaternary ammonium salt having an alkyl group with 20 or more carbon atoms as a cationic surfactant, it is preferable that the upper limit of the mass ratio of the total amount of cationic surfactant and higher alcohol to the amount of monohydric lower alcohol ([(total amount of cationic surfactant and higher alcohol) / (amount of monohydric lower alcohol)] ratio) is 0.15 or less, from the viewpoint of being able to further improve low-temperature stability. Furthermore, in the case of the cosmetic composition of this embodiment as described above, the lower limit of the ratio [(total amount of cationic surfactant and higher alcohol) / (amount of monohydric lower alcohol)] is, for example, 0.01 or more.

[0068] (optional ingredient) The cosmetic composition of this embodiment may contain, as appropriate, polyhydric alcohols including isopentyl diol and / or dipropylene glycol, monohydric lower alcohols, cationic surfactants, and components other than higher alcohols (hereinafter referred to as "optional components").

[0069] Optional components that can be incorporated into the cosmetic composition of this embodiment include, for example, water, nonionic surfactants, amphoteric surfactants, solid oils other than higher alcohols (hydrocarbons, fatty acids or their salts, waxes, esters, silicones, etc. that are solid at 25°C), liquid oils other than higher alcohols (hydrocarbons, fatty acids or their salts, waxes, esters, silicones, etc. that are liquid at 25°C), synthetic polymers, semi-synthetic polymers, natural polymers, proteins, plant and animal extracts, microbial-derived substances, inorganic compounds, fragrances, preservatives, UV absorbers, pigments, acids, alkalis, chelating agents, and the like.

[0070] (water) The cosmetic composition of this embodiment may or may not contain water. When water is included in the cosmetic composition of this embodiment, the amount of water is 10% by mass or less, from the viewpoint of further improving low-temperature stability. Therefore, the cosmetic composition of this embodiment can either not contain water, or contain water, with the amount of water being 10% by mass or less.

[0071] From the viewpoint of achieving further improved low-temperature stability, the cosmetic composition of this embodiment is preferably one that does not contain water.

[0072] Furthermore, when water is incorporated into the cosmetic composition of this embodiment, from the viewpoint of achieving further low-temperature stability, the upper limit of water is preferably 8% by mass or less, more preferably 5% by mass or less, even more preferably 3% by mass or less, and particularly preferably 1% by mass or less. Furthermore, when water is incorporated into the cosmetic composition of this embodiment, the lower limit of the amount of water incorporated is, for example, 0.0001% by mass or more.

[0073] When water is added to the cosmetic composition of this embodiment, the range of the amount of water added is preferably 0.0001% by mass or more and 8% by mass or less, more preferably 0.0001% by mass or more and 5% by mass or less, even more preferably 0.0001% by mass or more and 3% by mass or less, and particularly preferably 0.0001% by mass or more and 1% by mass or less. The reason why the lower limit is preferred among these ranges is the same as the viewpoint described above.

[0074] When water is included in the cosmetic composition of this embodiment, for example, the amount of water included may be greater than the amount of higher alcohol included.

[0075] (Ratio of [(amount of water) / (amount of higher alcohol)]) The cosmetic composition of this embodiment has a mass ratio of the amount of water to the amount of higher alcohol ([(amount of water) / (amount of higher alcohol)] ratio) which is, for example, 0 or more and 5 or less.

[0076] (acid) The cosmetic composition of this embodiment may contain one or more acids. The pH of the cosmetic composition of this embodiment can be adjusted by the addition of the acids. As the acids, organic acids (e.g., citric acid, lactic acid, glycolic acid, malic acid, etc.) and inorganic acids (e.g., phosphoric acid, etc.) can be used. The amount of the acid added to the cosmetic composition of this embodiment is, for example, 0.01% by mass or more and 2% by mass or less.

[0077] (alkali) The cosmetic composition of this embodiment may contain one or more alkalis. The pH of the cosmetic composition of this embodiment can be adjusted by the addition of the alkalis. As the alkalis, inorganic alkalis (e.g., potassium hydroxide, sodium hydroxide, ammonia, etc.) and organic alkalis (e.g., aminoethylpropanol, arginine, triethanolamine, etc.) can be used. The amount of alkali added to the cosmetic composition of this embodiment is, for example, 0.01% by mass or more and 2% by mass or less.

[0078] (Solid oils other than higher alcohols) The cosmetic composition of this embodiment may or may not contain solid oils other than higher alcohols. "Solid oils other than higher alcohols" refers to oils in a solid form (including paste, flake, and powder forms) that do not have fluidity when left standing at 25°C (excluding higher alcohols).

[0079] When a solid oil is incorporated into the cosmetic composition of this embodiment, the upper limit of the amount of solid oil incorporated is preferably 1% by mass or less, more preferably 0.5% by mass or less, and even more preferably 0.1% by mass or less, from the viewpoint of achieving further improvement in low-temperature stability.

[0080] Other solid oils besides the aforementioned higher alcohols can be used in cosmetic compositions. Examples include solid hydrocarbons that do not have fluidity at 25°C, fatty acids or their salts, waxes, esters, and silicones.

[0081] Examples of hydrocarbons that are solid at 25°C include paraffin and microcrystalline wax. Examples of fatty acids or salts thereof that are solid at 25°C include palmitic acid, stearic acid, behenic acid, or salts thereof. Examples of fatty acid salts include potassium salts, sodium salts, and magnesium salts. Examples of waxes that are solid at 25°C include candelilla wax, carnauba wax, rice bran wax, and sunflower seed wax. Examples of esters that are solid at 25°C include cetyl palmitate. Examples of silicones that are solid at 25°C include alkyl-modified silicones.

[0082] (Liquid cosmetic composition) The cosmetic composition of this embodiment is liquid. In this embodiment, "liquid" means that the viscosity value at 25°C, as measured with a B-type viscometer, is 3000 mPa·s or less. Here, the viscosity of the cosmetic composition of this embodiment is taken using a B-type viscometer with a rotor selected according to the viscosity, the rotor rotation speed is appropriately set, and the value measured after 60 seconds at 25°C is adopted. For example, the viscosity measurement value when using rotor No. 3 and a rotation speed of 12 rpm may be adopted.

[0083] (Dosage form) The dosage form of the cosmetic composition in this embodiment is, for example, lotion or emulsion.

[0084] (viscosity) The viscosity of the cosmetic composition of this embodiment is, for example, 10 mPa·s or more and 3000 mPa·s or less.

[0085] (exterior) The appearance of the cosmetic composition of this embodiment is not particularly limited other than being liquid, but can be transparent or opaque. Transparent means, for example, a state in which, when the cosmetic composition of this embodiment is stored in a colorless, transparent glass bottle at 25°C, the surrounding scenery can be seen through the stored cosmetic composition and the glass bottle. Opaque means, for example, a state in which, when the cosmetic composition of this embodiment is stored in a colorless, transparent glass bottle at 25°C, the surrounding scenery cannot be seen through the stored cosmetic composition and the glass bottle.

[0086] The cosmetic composition of this embodiment, for example, has a transparent appearance.

[0087] (pH) The pH of the cosmetic composition of this embodiment at 25°C is not particularly limited, but for example, it is between 4.0 and 9.0.

[0088] (Application) The cosmetic composition of this embodiment is used, for example, on hair, scalp, and skin other than the scalp.

[0089] The cosmetic composition of this embodiment can be used, for example, for hair. Examples of applications for hair include hair care (e.g., hair treatment, hair treatment for styling, component of multi-component hair treatment, hair treatment for pre-perm treatment, hair treatment for post-perm treatment, hair treatment for pre-hair coloring, hair treatment for post-hair coloring, hair treatment for pre-bleaching, hair treatment for post-bleaching, etc.), and hair styling applications. The hair treatment may be a leave-in hair treatment or a rinse-off hair treatment.

[0090] The cosmetic composition of this embodiment is preferably used as a hair treatment that is applied to the hair and then rinsed off, from the viewpoint of providing the hair with superior smoothness.

[0091] The cosmetic composition of this embodiment can be used not only for hair as described above, but also for the scalp and other skin. Examples of scalp applications include scalp treatments (e.g., leave-in scalp treatments, rinse-off scalp treatments, and components of multi-component scalp treatments).

[0092] The cosmetic composition of this embodiment may, for example, be suitable for both hair and scalp.

[0093] (How to use) The cosmetic composition of this embodiment may be used in accordance with known methods for using cosmetic compositions. For example, the cosmetic composition of this embodiment may be applied to water-soaked hair and / or scalp, and then dried.

[0094] (Thickening when mixed with water or in contact with water) The cosmetic composition of this embodiment contains a linear higher alcohol as the higher alcohol, and furthermore, if water is not included, or if water is included but the amount of water is 10% by mass or less (in this case, the cosmetic composition of this embodiment may be hereinafter referred to as "the specific cosmetic composition according to this embodiment"), it can be thickened when mixed with an appropriate amount of water or when in contact with an appropriate amount of water. The specific cosmetic composition according to this embodiment can change its dosage form from a liquid to a relatively viscous cream or gel by thickening when mixed with or in contact with water, thereby enhancing the visual effect during use.

[0095] Since the specific cosmetic composition according to this embodiment can be thickened by mixing it with an appropriate amount of water, a mixture of the specific cosmetic composition according to this embodiment and water can be used on hair, scalp, or other skin. The mixing ratio of the specific cosmetic composition to water according to this embodiment is, for example, 2:1 to 1:2 in weight ratio of the cosmetic composition to water.

[0096] The specific cosmetic composition according to this embodiment can be thickened when it comes into contact with an appropriate amount of water, and therefore, when used on wet hair, wet scalp, or skin other than the scalp, the specific cosmetic composition according to this embodiment can be thickened on the hair, scalp, or skin other than the scalp. Furthermore, when used on dry hair, scalp, or skin other than the scalp and then rinsed with water, the specific cosmetic composition according to this embodiment can be thickened.

[0097] (Manufacturing method) The cosmetic composition of this embodiment can be manufactured by employing a known method for manufacturing cosmetic compositions according to the dosage form.

[0098] <Hair Treatment Methods> The hair treatment method of this embodiment is a method of treating hair using the cosmetic composition of this embodiment described above. As for the hair treatment method of this embodiment, other than using the cosmetic composition of this embodiment, any known hair treatment method may be employed. Therefore, the method of using the cosmetic composition of this embodiment described above may also be used. [Examples]

[0099] The present invention will be described in detail below based on examples, but the present invention should not be interpreted as being limited based on the description of these examples.

[0100] (Preparation of cosmetic compositions for Examples 1-7 and Comparative Examples 1-8) The cosmetic compositions of Examples 1-7 and Comparative Examples 1-8 were prepared by mixing the components using conventional methods to obtain the component compositions shown in Tables 1-4. The low-temperature stability of the prepared cosmetic compositions of Examples 1-7 and Comparative Examples 1-8 was evaluated using the method described below. The cosmetic compositions of Examples 1-7 and Comparative Examples 1-8 were all liquid and transparent in appearance.

[0101] (Evaluation of low-temperature stability) The cosmetic compositions of Examples 1-7 and Comparative Examples 1-8 were each placed in two 50mL transparent glass tubes, 40g each, and sealed tightly. These tubes were then left to stand for one month in a -2°C incubator or at room temperature. After one month, the appearance of the transparent glass tube containing the cosmetic composition of Example 1 (room temperature storage sample) that had been left to stand at room temperature was visually compared with the appearance of the transparent glass tube containing the cosmetic composition of Example 1 that had been left to stand in a -2°C incubator (-2°C storage sample). Similarly, for the cosmetic compositions of Examples 2-7 and Comparative Examples 1-8, the appearance of the room temperature storage sample and the -2°C storage sample were compared in the same manner as for Example 1. The appearance of the -2°C storage samples was observed immediately after removing the transparent glass tubes containing each cosmetic composition from the incubator.

[0102] (Evaluation Criteria) ○: When comparing the appearance of the sample stored at room temperature with that of the sample stored at -2°C, no change in appearance was observed in either sample. △: The appearance of the sample stored at -2°C is cloudier compared to the appearance of the sample stored at room temperature. ×: Precipitates are visible in the sample stored at -2°C compared to the sample stored at room temperature.

[0103] (Evaluation results for Examples 1-3 and Comparative Examples 1-4) Table 1 shows the results of the evaluation of low-temperature stability for the cosmetic compositions of Examples 1-3 and Comparative Examples 1-4, along with the composition of each cosmetic composition.

[0104] [Table 1]

[0105] As shown in Table 1, the cosmetic compositions of Examples 1-3 exhibited superior low-temperature stability compared to the cosmetic compositions of Comparative Examples 1-4. Therefore, it can be seen that the inclusion of isopentyl diol or dipropylene glycol as a polyhydric alcohol results in excellent low-temperature stability.

[0106] (Evaluation results for Examples 4 and 5, and Comparative Examples 5-8) Table 2 shows the evaluation results of the low-temperature stability of the cosmetic compositions of Examples 4 and 5 and Comparative Examples 5 to 8, along with the composition of each cosmetic composition.

[0107] [Table 2]

[0108] As shown in Table 2, the cosmetic compositions of Examples 4 and 5 exhibited superior low-temperature stability compared to the cosmetic compositions of Comparative Examples 5 to 8. Therefore, it can be seen that the inclusion of isopentyl diol or dipropylene glycol as a polyhydric alcohol results in excellent low-temperature stability.

[0109] (Evaluation results for Examples 1, 6, and 7) The results of the evaluation of low-temperature stability for the cosmetic compositions of Examples 1, 6, and 7 are shown in Table 3, along with the composition of each cosmetic composition.

[0110] [Table 3]

[0111] As shown in Table 3, the cosmetic compositions of Examples 1, 6, and 7 exhibited superior low-temperature stability compared to the cosmetic compositions of the comparative examples shown in Tables 1 and 2.

[0112] (Evaluation other than low-temperature stability) In addition to the low-temperature stability evaluation described above, the prepared cosmetic composition was evaluated using differential scanning calorimetry, hair softness and smoothness, and viscosity when mixed with water.

[0113] (Differential scanning calorimetry) Differential scanning calorimetry (DSC) was performed using the cosmetic compositions of Examples 1-5 and Comparative Examples 1-8, according to the following method.

[0114] Differential scanning calorimetry was performed using a differential scanning calorimeter (TA instrument "DSC Q2000") for each sample of the cosmetic composition from Examples 1-5 and Comparative Examples 1-8. The measurement conditions were as follows: each sample of the cosmetic composition from Examples 1-5 and Comparative Examples 1-8 was placed in the differential scanning calorimeter, the temperature was adjusted to 25°C, and the temperature was lowered from 25°C to -10°C at a cooling rate of 2°C / min. After standing at -10°C for 10 minutes, the heat flow at each temperature was measured. From the measurement results, the temperature at which the heat flow reached its maximum value (exothermic peak temperature) when the temperature was lowered from 25°C to -10°C at a cooling rate of 2°C / min was determined. Tables 1 and 2 show the exothermic peak temperatures for the cosmetic compositions from Examples 1-5 and Comparative Examples 1-8. In addition, in Examples 1-4 of Tables 1 and 2, as shown in Figures 1 and 3 later, no peak top of the exothermic peak was observed, so the notation "≦10" is used.

[0115] Figure 1 shows the DSC charts for the cosmetic compositions of Examples 1-3 and Comparative Examples 1-3, Figure 2 shows the DSC chart for the cosmetic composition of Comparative Example 4, and Figure 3 shows the DSC charts for the cosmetic compositions of Examples 4, 5, and Comparative Examples 5-8. These DSC charts in Figures 1-3 are graphs showing the relationship between temperature and heat flow when the temperature is raised from 25°C to -10°C under the above measurement conditions, specifically under a cooling rate of 2°C / min. For convenience, the graphs in Figures 1-3 were created using positive heat flow values.

[0116] As shown in Tables 1 and 2 and Figures 1-3, the cosmetic compositions of Examples 1-5 either did not exhibit an exothermic peak or had a lower exothermic peak temperature compared to the cosmetic compositions of Comparative Examples 1-8. Therefore, in the comparison between the cosmetic compositions of Examples 1-5 and the cosmetic compositions of Comparative Examples 1-8, a correlation was observed between the absence of an exothermic peak or a lower exothermic peak temperature in the cosmetic compositions of Examples 1-5 and the evaluation results showing superior low-temperature stability. This correlation suggests that, in cosmetic compositions, the absence of an exothermic peak or a lower exothermic peak temperature compared to the comparable cosmetic compositions indicates that the cosmetic composition has superior low-temperature stability compared to the comparable cosmetic composition.

[0117] (Evaluation of hair softness and smoothness) The cosmetic compositions prepared in Examples 1, 2, 4, and 5 were applied to hair, and the softness and smoothness of the hair were evaluated.

[0118] (Hair treatment) Multiple hair bundles were created from hair collected from the same person, each approximately 27 cm long and weighing 10 g. After washing the hair bundles with shampoo (Milbon's "Grand Linkage Silky Luxe Shampoo"), 1 g of each cosmetic composition from Examples 1, 2, 4, and 5 was applied to the wet hair bundles. The cosmetic compositions were then rinsed off the hair bundles with running water, and the hair bundles were dried with a hairdryer.

[0119] (Evaluation method) Using each hair bundle that underwent the above hair treatment, two evaluators who routinely evaluate cosmetic compositions for hair performed a sensory evaluation by palpation of "hair softness" and "hair smoothness" according to the evaluation criteria below. Here, "hair softness" refers to the feeling that the hair feels soft when wrapped around the fingers, and "hair smoothness" refers to the feeling that the hair feels smooth with a uniform glide from the root to the tip when running a hand through the hair bundle. The evaluation criteria are as follows. Evaluation criteria for Examples 1 and 2: Example 2 Criteria for evaluation of Examples 4 and 5: Example 5

[0120] (Criteria for evaluating hair softness) ○: Compared to the evaluation criteria, the hair feels softer. Equivalent: The hair feels soft to the same degree as the evaluation criteria. ×: The hair does not feel as soft as the evaluation criteria suggest.

[0121] (Criteria for evaluating hair smoothness) ○: Compared to the evaluation criteria, the hair feels smoother. Equivalent: The hair feels smooth to the same degree as the evaluation criteria. ×: The hair does not feel as smooth as the evaluation criteria.

[0122] (Evaluation results for Examples 1, 2 and 4, 5) Tables 5 and 6 show the evaluation results for hair softness and smoothness in Examples 1 and 2 and Examples 4 and 5.

[0123] [Table 4]

[0124] [Table 5]

[0125] As shown in Table 4, the hair bundles treated with the cosmetic composition of Example 1, which contains IPG as a polyhydric alcohol containing IPG and / or DPG, exhibited superior softness and smoothness compared to the hair bundles treated with Example 2, which contains DPG. Furthermore, as shown in Table 5, the hair bundles treated with the cosmetic composition of Example 4, which contains IPG as a polyhydric alcohol containing IPG and / or DPG, exhibited superior softness and smoothness compared to the hair bundles treated with Example 5, which contains DPG. Therefore, it can be seen that when IPG is used as a polyhydric alcohol containing IPG and / or DPG, it results in superior hair softness and smoothness.

[0126] (Evaluation of viscosity when mixed with water) The viscosity of each cosmetic composition prepared in Examples 1-7, Comparative Examples 1-8, and Reference Example 1 was evaluated when mixed with water.

[0127] (Preparation of the cosmetic composition in Reference Example 1) The cosmetic composition of Reference Example 1 used for evaluation was prepared by mixing each component by conventional methods to achieve the following composition. Note that the cosmetic composition of Reference Example 1 is the same as the cosmetic composition of Example 1, but without myristyl alcohol and with an isopentyl diol content of 78.59% by mass.

[0128] (Composition of Reference Example 1) Isopentyl diol 78.59% by mass Ethanol 20% by mass Cetyltrimethylammonium chloride 1.41% by mass

[0129] The viscosity of the cosmetic compositions of Examples 1-7, Reference Example 1, and Comparative Examples 1-8 was evaluated when each cosmetic composition was mixed with an equal amount of water.

[0130] The mixing conditions were as follows: 40g of any of the cosmetic compositions from Examples 1-7, Reference Example 1, or Comparative Examples 1-8 was placed in a transparent glass tube (100mL), and 40g of purified water was added. The mixture was then stirred with a stirring rod for 1 minute. Subsequently, small amounts of the cosmetic composition from Example 1 before water mixing and the cosmetic composition from Example 1 after water mixing (a mixture of the cosmetic composition and water) were placed separately on a sheet of plastic wrap laid on a table. The viscosity of the cosmetic composition before water mixing or after water mixing was evaluated by spreading it with a finger according to the evaluation criteria below. In addition, the viscosity of the cosmetic compositions from Examples 2-7, Reference Example 1, and Comparative Examples 1-8 after water mixing was evaluated in the same manner as the evaluation of the cosmetic composition from Example 1.

[0131] (Evaluation Criteria) ○: The cosmetic composition after water mixing (a mixture of the cosmetic composition and water) has a higher viscosity than the cosmetic composition before water mixing. Equivalent: The viscosity of the cosmetic composition before water mixing and the cosmetic composition after water mixing (a mixture of the cosmetic composition and water) are of similar proportions. ×: The cosmetic composition after water mixing (a mixture of the cosmetic composition and water) has lower viscosity than the cosmetic composition before water mixing.

[0132] (Evaluation results for Examples 1-7, Reference Example 1, and Comparative Examples 1-8) Tables 6 and 7 show the evaluation results of the viscosity increase when water is mixed in the cosmetic compositions of Examples 1-7 and Reference Example 1.

[0133] [Table 6]

[0134] [Table 7]

[0135] As shown in Table 6, the cosmetic compositions of Examples 1-6 (containing myristyl alcohol as a higher alcohol) thickened when mixed with water. Conversely, the cosmetic composition of Reference Example 1 (without higher alcohol) and Example 7 (containing isostearyl alcohol as a higher alcohol) decreased in viscosity when mixed with water. This indicates that the inclusion of myristyl alcohol, a linear higher alcohol, results in excellent viscosity-increasing properties when mixed with water. Furthermore, the viscosity of the cosmetic composition after mixing with water (a mixture of the cosmetic composition and water) in Example 6 (containing 0.5% by mass of myristyl alcohol as a higher alcohol) was lower than that of the cosmetic compositions in Examples 1 to 5 (containing 1.5% by mass of myristyl alcohol as a higher alcohol). This indicates that increasing the amount of myristyl alcohol, a linear higher alcohol, tends to result in superior viscosity when mixed with water.

[0136] Furthermore, as shown in Table 7, the cosmetic compositions of Comparative Example 4 and Comparative Example 8 (containing only glycerin as a polyhydric alcohol) were reduced in viscosity by mixing with water, similar to the cosmetic composition of Reference Example 1 (containing no higher alcohols).

[0137] For reference data, the viscosity of the cosmetic compositions (mixtures of cosmetic composition and water) after mixing with water was measured using a B-type viscometer for each of the cosmetic compositions: Example 1 (containing myristyl alcohol as a higher alcohol), Example 6 (containing isostearyl alcohol as a higher alcohol), and Reference Example 1 (no higher alcohols). For the mixture of cosmetic composition and water in Example 1, the viscosity was taken after 60 seconds at 25°C using a No. 3 rotor at a rotation speed of 12 rpm. The viscosity of the mixtures of cosmetic composition and water in Example 5 and Reference Example 1 was measured under the same conditions as the viscosity measurement of the mixture of cosmetic composition and water in Example 1, except that the rotation speed was changed to 30 rpm.

[0138] The viscosity measurement results are shown below. Mixture of cosmetic composition from Example 1 and water: 2510 mPa·s Mixture of cosmetic composition from Example 6 with water: 39 mPa·s Mixture of cosmetic composition from Reference Example 1 and water: 41 mPa·s

[0139] (Example prescription) The following are examples of hair treatment formulations (Formulation Examples 1 to 153). The hair treatments in Formulation Examples 1 to 153 can be used as either rinse-off or leave-in hair treatments (out-of-bath treatments).

[0140] (Prescription Examples 1 to 152) Tables 8 to 35 show prescription examples 1 to 152. Note that the ingredient values ​​in Tables 8 to 35 represent the amount (in mass %), and "-" indicates that the ingredient is not included.

[0141] [Table 8]

[0142] [Table 9]

[0143] [Table 10]

[0144] [Table 11]

[0145] [Table 12]

[0146] [Table 13]

[0147] Table 14

[0148] Table 15

[0149] Table 16

[0150] Table 17

[0151] Table 18

[0152] Table 19

[0153] Table 20

[0154] Table 21

[0155] Table 22

[0156] Table 23

[0157] Table 24

[0158] Table 25

[0159] Table 26

[0160] Table 27

[0161] Table 28

[0162] Table 29

[0163] Table 30

[0164] Table 31

[0165] Table 32

[0166] Table 33

[0167] Table 34

[0168] [Table 35]

[0169] (Prescription example 153) Isopentyl diol 69% by mass Propylene glycol 5% by mass Dipropylene glycol 2% by mass 1,3-Butylene glycol 2% by mass Glycerin 1% by mass Ethanol 15.3% by mass Isopropanol 2% by mass Cetyltrimethylammonium chloride 0.9% by mass Behenyltrimethylammonium chloride 0.5% by mass Myristyl alcohol 1.2% by mass Cetyl alcohol 0.05% by mass Stearyl alcohol 0.03% by mass Behenyl alcohol 0.02% by mass Purified water 1% by mass

Claims

1. A polyhydric alcohol containing isopentyl diol and / or dipropylene glycol, a monohydric alcohol with 2 to 4 carbon atoms, a cationic surfactant, and a higher alcohol are blended together. The aforementioned polyhydric alcohol is isopentyl diol, The amount of polyhydric alcohol containing the isopentyl diol and / or dipropylene glycol is 60% by mass or more. A liquid cosmetic composition.

2. The mass ratio of the total amount of isopentyl diol and / or dipropylene glycol to the amount of polyhydric alcohol containing isopentyl diol and / or dipropylene glycol is 0.4 or more and 1 or less. The cosmetic composition according to claim 1.

3. A polyhydric alcohol comprising isopentyl diol and / or dipropylene glycol, a monohydric alcohol having 2 to 4 carbon atoms, a cationic surfactant, and a higher alcohol, The amount of polyhydric alcohol containing the isopentyl diol and / or dipropylene glycol is 60% by mass or more. A liquid cosmetic composition in which the mass ratio of the total amount of isopentyl diol and / or dipropylene glycol to the amount of polyhydric alcohol containing isopentyl diol and / or dipropylene glycol is 0.4 or more and 1 or less.

4. The mass ratio of the amount of higher alcohol to the amount of monohydric alcohol having 2 to 4 carbon atoms is 0.15 or less. The cosmetic composition according to claim 1 or claim 3.

5. The amount of polyhydric alcohol containing the isopentyl diol and / or dipropylene glycol is 85% by mass or less. The amount of the monohydric alcohol having 2 to 4 carbon atoms is 10% by mass or more and 30% by mass or less. The amount of the cationic surfactant blended is 0.1% by mass or more and 5% by mass or less. The amount of the aforementioned higher alcohol is 0.1% by mass or more and 1.6% by mass or less. The cosmetic composition according to claim 1 or claim 3.

6. Either no water is added, or water is added, but the amount of water is 10% by mass or less. The cosmetic composition according to claim 1 or claim 3.

7. A hair treatment method using the cosmetic composition described in claim 1 or claim 3.

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