Cosmetic composition

Abstract

This invention provides a rinse-off cosmetic composition containing smoky silica, offering excellent cleansing power and a pleasant feel. [Solution] Components (A), (B), and (C): (A) Aliphatic diols with 5 or more carbon atoms (B) Higher alcohols that are liquid at 20°C (C) Hydrophilic fuming silica A rinse-off cosmetic composition containing [the specified ingredient].

Description

Technical Field

[0001] The present invention relates to a rinse-off type cosmetic composition containing fumed silica.

Background Art

[0002] Fumed silica is known to exhibit various functions when incorporated into cosmetics.

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

[0004] In Patent Document 2, it is reported that in a detergent composition containing a specific fatty acid salt, a specific fatty acid amide, water, and 1,2-pentanediol, further containing fumed silica, a composition having good stability over time can be obtained.

[0005] In Patent Document 3, the present inventor reported that an oil-in-water type emulsified cosmetic containing fumed silica, an alkyl-modified carboxyvinyl polymer, hydrophobized cellulose, and an oil agent has excellent stability over time and can impart a fresh feeling during application.

Prior Art Documents

Patent Documents

[0006]

Patent Document 1

Patent Document 2

Patent Document 3

Summary of the Invention

Problems to be Solved by the Invention

[0007] The present invention aims to provide a rinse-off cosmetic composition containing smoky silica, which has excellent cleaning power and feel. [Means for solving the problem]

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

[0009] The present invention is understood through the following configuration. [1] Components (A), (B), and (C): (A) Aliphatic diols with 5 or more carbon atoms (B) Higher alcohols that are liquid at 20°C (C) Hydrophilic fuming silica A rinse-off cosmetic composition containing [the specified ingredient].

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

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

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

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

[0014] [6] A 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], which contains 0.5% by 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, which comprises applying the cosmetic composition according to any one of [1] to

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

Advantages of the Invention

[0020] According to the present invention, a cosmetic composition excellent in detergency against sebum dirt, makeup dirt, etc. can be provided. According to the present invention, a cosmetic composition excellent in the feeling of use when being applied to the skin can be provided. According to the present invention, a cosmetic composition excellent in storage stability can be provided.

Embodiments for Carrying Out the Invention

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

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

[0023] In the composition of the present invention, it is believed that stability is improved by the synergistic action of component (A) with component (B), and that cleansing performance is improved by component (B) blending well with dirt on the skin. Furthermore, it is believed that by combining component (C) with components (A) and (B), cleansing performance is further improved, and a unique and pleasant feel is imparted, resulting in a well-balanced and highly functional cosmetic product that is rinsed off.

[0024] <Component (A) Aliphatic Diol> Component (A) used in the present invention is an aliphatic diol having 5 or more carbon atoms, and one or more types can be used. The aliphatic diol is preferably an alkanediol, that is, one in which the residues other than the diol in the molecule are saturated hydrocarbons. The range of carbon atoms of the aliphatic diol or alkanediol is preferably 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 greater than 0% by mass, preferably 0.1% by mass or more, more preferably 0.5% by mass or more, and even more preferably 1.0% by mass or more. The upper limit of the content is preferably 10% by mass or less, more preferably 7.0% by mass or less, and even more preferably 5.0% by mass or less.

[0026] <Ingredient (B) Higher alcohol> 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. A 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, even more preferably 16 or more, and still more preferably 18 or more. As long as it is liquid at 20°C, there is no particular upper limit on the number of carbon atoms, 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 greater than 0% by mass, 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. The upper limit of the content is preferably 15% by mass or less, more preferably 10% by mass or less, and even more preferably 7.0% by mass or less.

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

[0029] <Component (C) Fume Silica> Component (C) used in the present invention is hydrophilic fumed silica, and one or more types can be used. Fumed silica, also known as fumed silica, is silica fine particles obtained by a gas-phase method (flame hydrolysis reaction of silicon tetrachloride (SiCl4) (dry combustion method)). The hydrophilic fumed silica may be either untreated fumed silica or fumed silica with a hydrophilic surface treatment. In this specification, nanosilica may also be used synonymously with fumed silica.

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

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

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

[0033] <Ingredient (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] When the composition of the present invention containing component (D) is applied to the skin, the presence of component (C) is thought to improve the rate at which dirt on the skin is adsorbed. In other words, the combination of component (C) and component (D) provides further improvement in cleansing performance.

[0035] Preferred 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, and sucrose fatty acid esters. 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), and sucrose laurate.

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

[0037] The content of component (D) is not particularly limited, but when used, from the viewpoint of cleaning properties, 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. At the upper limit of the content, from the viewpoint of stability and usability, it 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 less than 0.8, and more preferably less than 0.7, of the shear viscosity (ηb) after applying a shear force of 400 1 / s at 20°C to the shear viscosity (ηa) after applying a shear force of 1 1 / s. The lower limit of (ηb) / (ηa) is not particularly limited, but is preferably 0.3 or higher, more preferably 0.4 or higher, and more preferably 0.5 or higher.

[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) in accordance with the conditions described in the following examples. The composition of the present invention has a unique structural property due to the inclusion of component (C), which is reflected in the ratio (ηb) / (ηa). If this ratio is less than 0.8, the user will have a very strong feeling that the composition is crumbling as it spreads on the skin. In other words, this 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 compositions of the present invention may also contain various additives as needed, provided they are suitable for embodiments of the present invention that are used after being washed away, and do 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, foaming agents, cooling agents, chilling agents, plant and animal extracts, pigments, fragrances, various vitamins, and the like.

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

[0042] The composition of the present invention can be used as a rinse-off cosmetic by applying it to the skin of a desired area such as the face or body, allowing it to blend in as needed, and then rinsing it off with water or lukewarm water. The composition of the present invention has excellent cleansing properties, provides a uniquely pleasant feel, and ensures storage stability, making it suitable as a skin cleanser, and is particularly suitable as a cleansing agent, facial wash, massage agent, etc. Therefore, the method of use of the present invention can be used for cleansing, facial washing, and / or massage. [Examples]

[0043] The following are specific examples of embodiments of the present invention.

[0044] (Examples 1-3 and Comparative Examples 1-5) Cleansing agents with the component composition shown in Table 1 were manufactured using the following method, and their cleansing ability, storage stability, feel, and physical properties were evaluated. The results are also shown in Table 1.

[0045] (Preparation of composition) The oily and aqueous components were heated to approximately 80°C, and components (A) and (D) were added to the oily component, while components (B) and (C) were added to the aqueous component and mixed until homogenized. All components were then uniformly mixed using a Primix MARK II 2.5 homomixer, and the mixture was stirred and cooled to room temperature to obtain the desired composition.

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

[0047] (Method for evaluating storage stability) The compositions for each example were stored at -5°C and 50°C for two weeks, respectively. After storage, their 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 were observed (separation, precipitation, changes in viscosity, etc.). C. Obvious changes in appearance (separation, precipitation, changes in viscosity, etc.) were observed.

[0048] (Method for evaluating user experience) Each of the five trained panelists applied the composition of Comparative Example 1 to one arm as a control, and the test sample to the other arm, directly. After rinsing with tap water, they evaluated the "stickiness and smoothness" according to the following criteria. The scores given by three or more panelists were used as the evaluation results. Compared to the composition of Comparative Example 1, it does not feel sticky, is smooth, and has a good feel when used. B. The stickiness and smoothness are equivalent to that of the composition in Comparative Example 1. C. Compared to the composition of Comparative Example 1, it is stickier, less smooth, and has a poor user experience.

[0049] (Method for measuring physical properties) Shear viscosity was measured using an Anton Paar Physica MCR 301 with a cone plate as the jig, at a temperature of 20°C, following these steps: (1) Perform a shear treatment at 1 1 / s for 30 seconds, and let the shear viscosity at this time be (ηa). (2) Then, perform a continuous shear treatment at 400 1 / s for 30 seconds, and then again (3) perform a shear treatment at 1 1 / s for 30 seconds. Let the shear viscosity at this time be the shear viscosity (ηb). Here, (2) corresponds to the shear treatment simulating application to the skin.

[0050] [Table 1]

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

[0052] As shown in the results in Table 1, Examples 1 to 3, which have the component composition defined in the present invention, performed well in all evaluations. On the other hand, Comparative Examples 1 to 5 all showed clearly inferior results in terms of cleaning performance. Comparative Example 1, which used propylene glycol with fewer than 5 carbon atoms instead of component (A), and Comparative Example 5, which did not use component (B), also showed slightly inferior usability. Comparative Example 3, which used stearyl alcohol, which is solid at 20°C, instead of component (B), showed clearly inferior usability and stability. Comparative Example 2, which used hydrophobic large-particle (non-nano-size) silica instead of component (C), showed clearly inferior usability and slightly inferior stability. Comparative Example 4, which used hydrophobic fuzzy silica and hydrophobic large-particle (non-nano-size) silica in combination instead of component (C), showed slightly inferior usability and clearly inferior stability.

[0053] The following are examples of formulations for producing the compositions of the present invention. All values ​​in the table are in "mass percent".

[0054] (Example prescription 1: Massage fee) [Table 2]

[0055] (Example prescription 2: Cleansing agent) [Table 3]

Claims

1. Components (A), (B), and (C): (A) Aliphatic diols with 5 or more carbon atoms (B) Higher alcohols that are liquid at 20°C (C) Hydrophilic fuming silica A rinse-off cosmetic composition containing [the specified ingredient].

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

8.

3. The cosmetic composition according to claim 1 or 2, further containing 5.0% by mass or more of component (D) surfactant.

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

5. A cosmetic composition according to claim 1 or 2, comprising 0.5% by mass or more of component (A).

6. The cosmetic composition according to claim 1 or 2, wherein component (A) is an aliphatic diol having 5 to 7 carbon atoms.

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

8. A cosmetic composition according to claim 1 or 2, comprising 0.5% by mass or more of component (B).

9. The cosmetic composition according to claim 1 or 2, wherein component (B) is selected from octyldodecanol or isostearyl alcohol.

10. The cosmetic composition according to claim 1 or 2, wherein the mass ratio of the content of component (A) to the content of component (B) ((A) / (B)) is 0.3 or more.

11. A method of using a cosmetic composition, comprising applying the cosmetic composition according to claim 1 or 2 to the skin and then washing it off.

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