Cosmetic composition

Abstract

To provide a wash-off cosmetic composition containing fumed silica and having excellent detergency and feeling of use. [Solution] Components (A), (B) and (C): (A) Aliphatic diol having 5 or more carbon atoms (B) A higher alcohol that is liquid at 20°C (C) Hydrophilic fumed silica A wash-off cosmetic composition comprising:

Description

[Technical field]

[0001] The present invention relates to a wash-off cosmetic composition containing fumed silica. [Background technology]

[0002] Fumed silica is known to exert various functions when blended into cosmetics.

[0003] Patent Document 1 reports that a non-aqueous cosmetic preparation containing a polyhydric alcohol and silica gel, where the polyhydric alcohol is preferably propylene glycol or the like, and the silica gel has a particle size preferably of 1 to 10,000 millimicrons (nanometers), is easy to wash off (can be easily washed off with water).

[0004] Patent Document 2 reports that a cleaning composition containing a specific fatty acid salt, a specific fatty acid amide, water, and 1,2-pentanediol can have good stability over time by further containing fumed silica.

[0005] In Patent Document 3, the present inventors report that an oil-in-water emulsion cosmetic containing fumed silica, an alkyl-modified carboxyvinyl polymer, a hydrophobized cellulose, and an oil agent has excellent stability over time and can impart a fresh feeling of use upon application. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] Japanese Patent Application Publication No. 9-194327 [Patent Document 2] JP 2009-234967 A [Patent Document 3] Patent Publication No. 2022-101050 Summary of the Invention [Problem to be solved by the invention]

[0007] An object of the present invention is to provide a wash-off cosmetic composition which contains fumed silica and has excellent detergency and a good feeling when used. [Means for solving the problem]

[0008] The present inventors have discovered that fumed silica can exhibit high functionality as a cosmetic composition when combined with a specific diol component and a specific alcohol component, and have thus completed the present invention.

[0009] The present invention can be realized by the following configuration. [1] Components (A), (B) and (C): (A) Aliphatic diol having 5 or more carbon atoms (B) A higher alcohol that is liquid at 20°C (C) Hydrophilic fumed silica A wash-off cosmetic composition comprising:

[0010] [2] The cosmetic composition according to [1], wherein the ratio (ηb) / (ηa) of the shear viscosity (ηb) after application of a shear force of 400 1 / s to the shear viscosity (ηa) after application of a shear force of 1 1 / s at 20°C is less than 0.8.

[0011] [3] The cosmetic composition according to [1] or [2], further comprising 5.0% by mass or more of component (D) a surfactant.

[0012] [4] The cosmetic composition according to [3], wherein component (D) is a nonionic surfactant.

[0013] [5] The cosmetic composition according to any one of [1] to [4], containing 0.5 mass % or more of component (A).

[0014] [6] The cosmetic composition according to any one of [1] to [5], wherein component (A) is an aliphatic diol having 5 to 7 carbon atoms.

[0015] [7] The cosmetic composition according to [6], wherein component (A) is selected from 1,2-pentanediol, 1,2-hexanediol and isopentyldiol.

[0016] [8] The cosmetic composition according to any one of [1] to [7], containing 0.5 mass % or more of component (B).

[0017] [9] The cosmetic composition according to any one of [1] to [8], wherein component (B) is selected from octyldodecanol or isostearyl alcohol.

[0018]

[10] The cosmetic composition according to any one of [1] to [9], wherein the mass ratio ((A) / (B)) of the content of component (A) to the content of component (B) is 0.3 or more.

[0019]

[11] A method for using a cosmetic composition, comprising applying the cosmetic composition according to any one of [1] to

[10] to the skin and then rinsing it off. Effect of the Invention

[0020] According to the present invention, a cosmetic composition having excellent cleansing properties against sebum stains, makeup stains, and the like can be provided. According to the present invention, it is possible to provide a cosmetic composition that has an excellent feel when applied to the skin. According to the present invention, a cosmetic composition having excellent storage stability can be provided. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0021] The present invention will be described in detail below. In this specification, the content of each component is based on the total mass of the cosmetic composition, unless otherwise specified.

[0022] The cosmetic composition of the present invention contains as its ingredients (A) an aliphatic diol having 5 or more carbon atoms, (B) a higher alcohol that is liquid at 20° C., and (C) fumed silica, and is of the type that is washed off before use.

[0023] In the composition of the present invention, it is believed that the synergistic effect of component (A) and component (B) improves stability, and that component (B) blends well with dirt on the skin, improving cleansing properties. Furthermore, by combining component (C) with components (A) and (B), it is believed that the cleansing properties are further improved and a unique and good feeling of use is imparted, thereby providing a well-balanced and high functionality as a cosmetic product that is used by rinsing it off.

[0024] <Component (A) Aliphatic diol> The component (A) used in the present invention is an aliphatic diol having 5 or more carbon atoms, and one or more of them can be used. The aliphatic diol is preferably an alkanediol, that is, a diol in which the residue other than the diol in the molecule is a saturated hydrocarbon. The carbon number of the aliphatic diol or alkanediol is preferably in the range of 5 to 7, and particularly preferably 5 to 6. Examples of such aliphatic diols include 1,2-pentanediol, 1,2-hexanediol, and isopentyldiol.

[0025] The content of component (A) is an amount exceeding 0 mass%, and is preferably 0.1 mass% or more, more preferably 0.5 mass% or more, and even more preferably 1.0 mass% or more. The upper limit of the content is preferably 10 mass% or less, more preferably 7.0 mass% or less, and even more preferably 5.0 mass% or less.

[0026] <Component (B) Higher Alcohol> The component (B) used in the present invention is a higher alcohol that is liquid at 20°C, and one or more types can be used. Here, liquid means that it exhibits fluidity. The higher alcohol refers to a monohydric alcohol having 6 or more carbon atoms. The number of carbon atoms is preferably 12 or more, more preferably 14 or more, more preferably 16 or more, and even more preferably 18 or more. As long as it is liquid at 20°C, there is no particular limit to the upper limit of the carbon number, but it is typically 24 or less, preferably 22 or less, and more preferably 20 or less. Examples of such higher alcohols include octyldodecanol and isostearyl alcohol.

[0027] The content of component (B) is an amount exceeding 0 mass%, and is preferably 0.1 mass% or more, more preferably 0.3 mass% or more, and even more preferably 0.5 mass% or more. The upper limit of the content is preferably 15 mass% or less, more preferably 10 mass% or less, and even more preferably 7.0 mass% or less.

[0028] The mass ratio ((A) / (B)) of the content of component (A) to the content of component (B) is preferably 0.3 or more, more preferably 0.4 or more, and even more preferably 0.5 or more. The upper limit of the mass ratio is preferably 30 or less, more preferably 20 or less, more preferably 10 or less, and even more preferably 5.0 or less. By setting the mass ratio of component (A) to component (B) in a suitable range, the effects of the present invention can be obtained at a higher level.

[0029] <Component (C) Fume Silica> The component (C) used in the present invention is hydrophilic fumed silica, and one or more kinds can be used. Fumed silica is also called fumed silica, and is silica fine particles obtained by a gas phase method (flame hydrolysis reaction (dry combustion method) of silicon tetrachloride (SiCl4)). The hydrophilic fumed silica may be either fumed silica that is not surface-treated or fumed silica that is surface-treated to be hydrophilic. In this specification, the term nanosilica may be used synonymously with fumed silica.

[0030] The average particle size of the primary particles of component (C) is preferably 1 nm or more and 100 nm or less, more preferably 3 nm or more and 60 nm or less, and even more preferably 5 nm or more and 30 nm or less. The average particle size can be measured, for example, from an electron microscope photograph.

[0031] Examples of commercially available products include Aerosil 200, Aerosil 300 (both manufactured by Nippon Aerosil Co., Ltd.), Cabosil M-5 (manufactured by Cabot Corporation), and HDK-N20 (manufactured by Wacker Asahi Kasei Silicones Co., Ltd.).

[0032] The content of component (C) is an amount exceeding 0 mass%, preferably 0.01 mass% or more, more preferably 0.05 mass% or more, and even more preferably 0.1 mass% or more. The upper limit of the content is preferably 5.0 mass% or less, more preferably 4.0 mass% or less, and even more preferably 3.0 mass% or less.

[0033] <Component (D) Surfactant> The composition of the present invention may further contain one or more surfactants as component (D). The surfactants that can be used are not particularly limited, but nonionic surfactants and / or anionic surfactants are preferred, and nonionic surfactants are more preferred.

[0034] It is believed that when the composition of the present invention containing component (D) is applied to the skin, the presence of component (C) increases the rate at which dirt on the skin is adsorbed, i.e., the combination of components (C) and (D) provides further improvement in cleansing properties.

[0035] Preferred examples of nonionic surfactants include polyoxyethylene fatty acid esters, polyoxyethylene sorbitan fatty acid esters, sorbitan fatty acid esters, glycerin fatty acid esters, polyglycerin fatty acid esters, polyoxyethylene hydrogenated castor oil, polyoxyethylene alkyl ethers, sucrose fatty acid esters, etc. Specific examples of preferred nonionic surfactants include PEG-20 glyceryl triisostearate, sorbeth-30 tetraoleate, glyceryl stearate, polyglyceryl-10 myristate, polyglyceryl-10 stearate, polyglyceryl-10 isostearate, polyglyceryl-10 distearate, PEG-60 hydrogenated castor oil, polyoxyethylene octyldodecyl ether (octyldodeceth-25), sucrose laurate, etc.

[0036] Examples of anionic surfactants include salts of various acids having a saturated or unsaturated alkyl group. The alkyl chain may be either linear or branched. The alkyl chain may have other functional groups (e.g., amino groups, ether groups, ester groups, etc.) inside. Preferred examples of anionic surfactants include carboxylic acids and their salts, sulfates, and sulfonates having an alkyl group having 10 to 20 carbon atoms. More preferred are salts of higher fatty acids having 12 to 18 carbon atoms with potassium hydroxide, sodium hydroxide, triethanolamine, and arginine, and even more preferred are higher fatty acids having 12 to 18 carbon atoms and their potassium salts.

[0037] The content of component (D) is not particularly limited, but when used, from the viewpoint of cleaning ability, it is preferably 5.0% by mass or more, more preferably 8% by mass or more, and even more preferably 10% by mass or more. From the viewpoint of stability and usability, the upper limit of the content is preferably 40% by mass or less, more preferably 35% by mass or less, and even more preferably 30% by mass or less.

[0038] <Physical properties> The composition of the present invention preferably has a ratio (ηb) / (ηa) of the shear viscosity (ηb) after application of a shear force of 400 1 / s to the shear viscosity (ηa) after application of a shear force of 1 1 / s at 20° C., less than 0.8, more preferably less than 0.7. The lower limit of (ηb) / (ηa) is not particularly limited, but is preferably 0.3 or more, more preferably 0.4 or more, and more preferably 0.5 or more.

[0039] Here, the shear viscosity can be measured using a commercially available viscoelasticity measuring device (rheometer; for example, Physica MCR 301 manufactured by Anton Paar) according to the conditions described in the following examples. The composition of the present invention has a unique structure due to the inclusion of component (C), which is reflected in the ratio (ηb) / (ηa). If the ratio is less than 0.8, the user will feel a very strong sensation of the composition spreading on the skin while crumbling. In other words, the ratio can be said to be a value that correlates with the feel of the composition when used.

[0040] <Additional ingredients> In addition to the above-mentioned components, the composition of the present invention may contain various additives as necessary within the scope of the embodiment of the present invention in which the composition is used after rinsing and does not substantially impair the effects of the present invention. Examples of such additives include polyhydric alcohols other than component (A), oils other than component (B), powders other than component (C), thickeners, wetting agents, pH adjusters, antioxidants, preservatives, bactericides, anti-inflammatory agents, chelating agents, inorganic or organic salts, foam boosters, refreshing agents, cooling agents, animal and plant extracts, colorants, fragrances, various vitamins, etc.

[0041] The method for producing the composition of the present invention is not particularly limited, and the composition can be prepared according to a conventional method. For example, the composition can be obtained by mixing components (A), (B) and (C), and further adding component (D) and appropriate additive components as necessary.

[0042] The composition of the present invention can be used as a wash-off cosmetic by applying it to the skin of a desired part such as the face or body, allowing it to be absorbed appropriately, and then rinsing it off with water or lukewarm water. The composition of the present invention has excellent cleansing properties, gives a uniquely good feeling when used, and has storage stability, so it is suitable as a skin cleanser, and more specifically, is particularly suitable as a cleansing agent, face wash, massage agent, etc. Therefore, the method of use of the present invention can be carried out for cleansing, face washing, and / or massage. EXAMPLES

[0043] The embodiments of the present invention will be specifically illustrated below.

[0044] (Examples 1 to 3 and Comparative Examples 1 to 5) A cleansing agent having the composition shown in Table 1 was produced by the following method, and its cleaning ability, storage stability, feel during use, and physical properties were evaluated. The results are also shown in Table 1.

[0045] (Preparation of Composition) The oil component and the aqueous component were heated to about 80°C, and then components (A) and (D) were added to the oil component, and components (B) and (C) were added to the aqueous component, and the mixture was homogenized. All the components were homogenously mixed using a PRIMIX Corporation homogenizer MARK II 2.5 model, and then the mixture was stirred and cooled to room temperature to obtain the desired composition.

[0046] (Method for evaluating cleaning ability) 0.01g of a commercially available lip color was applied to a 4.5cm square frame of Sapplar (artificial skin), dried at room temperature for 3 hours, and then 0.1g of each composition was applied from above. While checking the weight to ensure a pressure of about 100g, the applied composition was rotated 20 times with a finger to blend into the lipstick, then washed with tap water at room temperature and visually checked for remaining lipstick. The results were evaluated according to the following criteria. A: Lipstick has been completely or almost completely removed from the skin grooves. B: Lipstick has been removed from about half of the skin groove area. C Lipstick remains in most of the skin grooves

[0047] (Evaluation method for storage stability) The compositions of each example were stored at -5°C and 50°C for 2 weeks, respectively, and then the appearance was visually observed and the results were evaluated according to the following criteria. A No changes in appearance were observed. B Slight changes in appearance (separation, precipitation, change in viscosity, etc.) were observed. C. Obvious changes in appearance (separation, precipitation, change in viscosity, etc.) were observed.

[0048] (Method of evaluating usability) Five trained panelists directly applied each composition to one arm, the composition of Comparative Example 1 as a control, and the test sample to the other arm, and after rinsing with tap water, evaluated the "stickiness and smooth feeling" according to the following criteria. The score given by three or more panelists was regarded as the evaluation result. A Compared to the composition of Comparative Example 1, it does not feel sticky, is smooth, and has a good feel when used. B: Sticky feeling and smooth feeling are equivalent to those of the composition of Comparative Example 1. C: Stickier than the composition of Comparative Example 1, less smooth and less pleasant to use.

[0049] (Methods for measuring physical properties) The shear viscosity was measured using Anton Paar's Physica MCR 301 with a cone plate as the jig at 20°C, following the procedure below: (1) A shear treatment of 1 1 / s was performed for 30 seconds, and the shear viscosity at this time was taken as (ηa). (2) Then, a shear treatment of 400 1 / s was performed continuously for 30 seconds, followed by (3) a shear treatment of 1 1 / s for 30 seconds again. The shear viscosity at this time was taken as (ηb). Note that (2) here corresponds to the shear treatment that simulates application to the skin.

[0050] [Table 1]

[0051] The hydrophilic fumed silica used was AEROSIL 200 (Nippon Aerosil Co., Ltd.) (the same applies to the formulation examples below), the hydrophobic fumed silica used was AEROSIL R972 (Nippon Aerosil Co., Ltd.), and the hydrophobic large particle silica used was SUNSIL-130LSC (SUNJIN BEAUTY SCIENCE CO., LTD.).

[0052] As shown in the results of Table 1, Examples 1 to 3 having the component compositions defined as the present invention were good in all evaluations. On the other hand, Comparative Examples 1 to 5 all had clearly inferior results in terms of cleaning properties. Comparative Example 1, in which propylene glycol having less than 5 carbon atoms was used instead of component (A), and Comparative Example 5, in which component (B) was not used, also had slightly inferior usability. Comparative Example 3, in which stearyl alcohol, which is solid at 20°C, was used instead of component (B), both the usability and stability were clearly inferior. Comparative Example 2, in which hydrophobic large particle size (non-nano size) silica was used instead of component (C), also had clearly inferior usability and slightly inferior stability. Comparative Example 4, in which hydrophobic fumed silica and hydrophobic large particle size (non-nano size) silica were used in combination instead of component (C), also had slightly inferior usability and clearly inferior stability.

[0053] Examples of formulations for producing the compositions of the present invention are given below. All values ​​in the tables are in "mass %."

[0054] (Prescription example 1: Massage fee) [Table 2]

[0055] (Formulation example 2: Cleansing agent) [Table 3]

Claims

1. Components (A), (B) and (C): (A) Aliphatic diol having 5 or more carbon atoms (B) a higher alcohol having 6 or more carbon atoms that is liquid at 20°C (C) Hydrophilic fumed silica: more than 0% by mass and not more than 4.0% by mass A rinse-off type skin cleansing composition comprising:

2. 2. The skin cleansing composition according to claim 1, wherein the ratio (ηb) / (ηa) of the shear viscosity (ηb) after application of a shear force of 400 1 / s to the shear viscosity (ηa) after application of a shear force of 1 1 / s at 20°C is less than 0.

8.

3. The skin cleansing composition according to claim 1 or 2, further comprising 5.0 mass% or more of a surfactant as component (D).

4. 4. The skin cleansing composition according to claim 3, wherein component (D) is a nonionic surfactant.

5. 3. The skin cleansing composition according to claim 1, comprising 0.5% by mass or more of component (A).

6. 3. The skin cleansing composition according to claim 1, wherein the component (A) is an aliphatic diol having from 5 to 7 carbon atoms.

7. 7. The skin cleansing composition according to claim 6, wherein component (A) is selected from 1,2-pentanediol, 1,2-hexanediol and isopentyldiol.

8. 3. The skin cleansing composition according to claim 1, comprising 0.5% by mass or more of component (B).

9. 3. The skin cleansing composition according to claim 1, wherein the component (B) is selected from octyldodecanol or isostearyl alcohol.

10. 3. The skin cleansing composition according to claim 1, wherein the mass ratio ((A) / (B)) of the content of component (A) to the content of component (B) is 0.3 or more.

11. A method for using the skin cleansing composition according to claim 1 or 2, which comprises applying the skin cleansing composition to the skin and then rinsing it off.

Images