Skin cleansing agent composition

Abstract

To provide a skin cleansing composition that excels in emulsion stability, cleansing power, and ease of rinsing; shows suppression of viscosity increase even at low temperatures; and has good usability.SOLUTION: A skin cleansing composition contains following components (A), (B), (C), (D) and (E): (A) 1,3-butyleneglycol of 10-80 mass%, (B) trimethylglycine of 4-19 mass%, (C) an emulsifier, (D) an oil solution that is liquid at 25°C of 5-50 mass%, and (E) water of 0.1-10 mass%.SELECTED DRAWING: None

Description

Technical Field

[0001] The present invention relates to a skin cleansing composition.

Background Art

[0002] Conventionally, skin cleansing compositions containing a humectant or an oil agent have been studied in order to remove dirt such as makeup cosmetics and to impart a moist texture to the skin after washing. For example, Patent Document 1 describes that a cleansing composition containing 30 to 80% by weight of a humectant, 1 to 50% by weight of an oil component, and 0.01 to 10% by weight of water can thoroughly remove stubborn dirt and has excellent usability.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] In such a cleansing composition, as the humectant, a polyol which is a water-soluble solvent having two or more hydroxyl groups is used, and mainly glycerin is used in large amounts. In a region where water is scarce, the polyol can exhibit detergency that can dissolve oily dirt such as makeup as a solvent. Also, glycerin has excellent solubility of the emulsifier even in a region where water is scarce, enabling the blending of an oil component. However, glycerin's viscosity is temperature-dependent, becoming highly viscous at low temperatures. Therefore, compositions primarily containing glycerin are difficult to spread even at room temperature, and their viscosity becomes significantly higher at low temperatures, reducing their usability. To prevent this, using polyols that are liquid at low temperatures and do not easily increase viscosity presents challenges such as the emulsifier precipitation, separation, or uniform dispersion, leading to reduced emulsifying power and separation of oil, thus decreasing emulsification stability. Furthermore, dissolving solid humectants at room temperature requires the addition of a large amount of water, which prevents the cleaning properties that arise from the compatibility of water-soluble solvents with oily stains from being fully realized. [Means for solving the problem]

[0005] The inventors have discovered that by using 1,3-butylene glycol in combination with trimethylglycine, a skin cleansing composition can be obtained that exhibits excellent emulsification stability and cleansing properties, does not become viscous even at low temperatures, and has good usability, even in the range of 0.1 to 10% by mass where the water content is low.

[0006] The present invention comprises the following components (A), (B), (C), (D), and (E): (A) 1,3-butylene glycol 10-80% by mass, (B) Trimethylglycine 4-19% by mass, (C) Emulsifier, (D) Liquid oil at 25℃, 5-50% by mass, (E) Water 0.1~10% by mass This relates to a skin cleansing composition containing [specific ingredient]. [Effects of the Invention]

[0007] The skin cleansing composition of the present invention exhibits excellent emulsification stability and cleansing properties, does not become viscous even at low temperatures, and has good usability. [Modes for carrying out the invention]

[0008] The content of 1,3-butylene glycol in component (A) used in the present invention is preferably 10% by mass or more, more preferably 12% by mass or more, more preferably 15% by mass or more, less preferably 80% by mass or less, less preferably 75% by mass or less, and even more preferably 70% by mass or less, from the viewpoint of usability at low temperatures. Furthermore, the content of component (A) is preferably 10 to 80% by mass, more preferably 12 to 75% by mass, and more preferably 15 to 70% by mass, from the total composition.

[0009] The trimethylglycine content of component (B) used in the present invention is preferably 4% by mass or more, more preferably 5% by mass or more, more preferably 7% by mass or more, less preferably 19% by mass or less, less preferably 18% by mass or less, and even more preferably 17.5% by mass or less, from the viewpoint of good emulsification stability and rinseability. Furthermore, the content of component (B) is preferably 4 to 19% by mass, more preferably 5 to 18% by mass, and more preferably 7 to 17.5% by mass, from the viewpoint of good emulsification stability and rinseability.

[0010] In the present invention, the mass ratio (A) / (B) of component (A) to component (B) is preferably 1.2 or more, more preferably 1.5 or more, even more preferably 2 or more, preferably 20 or less, more preferably 15 or less, and even more preferably 12 or less, from the viewpoint of emulsification stability. Furthermore, the mass ratio (A) / (B) of component (A) to component (B) is preferably 1.2 to 20, more preferably 1.5 to 15, and even more preferably 2 to 12.

[0011] As the emulsifier for component (C), those commonly used in skin cleansing compositions, such as high-molecular-weight emulsifiers and nonionic surfactants, can be used. Examples of polymer emulsifiers include polymers containing monomers selected from (c1), (c2), and (c3) as constituent units. (c1) A monomer selected from acrylic acid and methacrylic acid, (c2) Monomers selected from alkyl acrylates and alkyl methacrylates and (c3) A monomer selected from polyoxyethylene alkyl esters of acrylic acid and polyoxyethylene alkyl esters of methacrylic acid.

[0012] Such polymers may contain monomers other than those selected from (c1), (c2), and (c3), and may have a crosslinked structure. From the viewpoint of dispersibility and emulsification stability, it is preferable to use a polymer that contains at least (c1) as a constituent unit, and it is more preferable to use a copolymer that contains at least (c1) and (c2) as constituent units.

[0013] In the polymer of component (C), if monomers other than those selected from (c1), (c2), and (c3) are included as constituent units, it is preferable that the molar ratio of these monomers to the total monomers be less than 10 mol%, more preferably 5 mol% or less, and even more preferably 1 mol% or less.

[0014] In the monomers of (c2) (alkyl acrylate and alkyl methacrylate), the alkyl group of the alkyl ester preferably has 1 to 50 carbon atoms, more preferably 1 to 40 carbon atoms, and even more preferably 1 to 30 carbon atoms.

[0015] In the monomers of (c3) (polyoxyethylene alkyl ester of acrylic acid and polyoxyethylene alkyl ester of methacrylic acid), the number of moles of polyoxyethylene added is preferably 10 to 30, and more preferably 12 to 25. The alkyl group of the alkyl ester preferably has 12 to 22 carbon atoms, and more preferably 18 to 22 carbon atoms. The monomer of (c3) preferably includes one or more selected from, for example, an ester of acrylic acid and polyoxyethylene (20) stearyl ether, an ester of methacrylic acid and polyoxyethylene (20) stearyl ether, an ester of acrylic acid and polyoxyethylene (25) behenyl ether, and an ester of methacrylic acid and polyoxyethylene (25) behenyl ether.

[0016] Examples of polymers for component (C) include the following: Polymers that contain monomer (c1) as a constituent unit but do not contain monomer (c2) or monomer (c3) as constituent units include polyacrylic acid, polymethacrylic acid, carboxyvinyl polymer (crosslinked polyacrylic acid; commercially available as Carbopol 980, Carbopol 981, Carbopol ETD2050 polymer, Carbopol Ultrez10 polymer (all manufactured by Lubrizol Advanced Materials)), acrylic acid / methacrylic acid copolymer, etc.

[0017] A copolymer containing monomers (c1) and (c2) as constituent units, but not monomer (c3), is acrylic acid / (meth)acrylate alkyl copolymer ((Acrylates / (C10-30) alkyl acrylate) crosspolymer; PEMULEN TR-1, PEMULEN TR-2, Carbopol ETD2020 (Lubrizol Advanced Examples include Acrylates copolymer (manufactured by Materials Inc.), Acrylates copolymer (a copolymer consisting of two or more components from alkyl acrylate, alkyl methacrylate, acrylic acid, and methacrylic acid; Aculin 33 (manufactured by Rohm & Haas Inc.)), Acrylates / Neodecanoate vinyl crosspolymer ((meth)acrylic acid / (meth)acrylate / Neodecanoate vinyl crosspolymer; Aculin 38 (manufactured by Rohm & Haas Inc.)), Acrylates / Stearyl acrylate copolymer (described in Japanese Patent Publication No. 2007-238549), Acrylates / Itaconic acid steareth-20 copolymer (STRUCTURE2001, STRUCTURE3001 (manufactured by Akzo Nobel)), etc.

[0018] Examples of the copolymer containing the monomers of (c1), the monomers of (c2), and the monomers of (c3) as constituent units include (acrylates / stearyl methacrylate-20) copolymer (Acrylin 22 (manufactured by Rohm and Haas)), (acrylates / behenyl methacrylate-25) copolymer (Acrylin 28 (manufactured by Rohm and Haas)), (acrylates / stearyl methacrylate-20) cross-polymer (Acrylin 88 (manufactured by Rohm and Haas)), and the like.

[0019] Among these polymers, from the viewpoint of excellent emulsion stability, polymers composed of two or more monomers selected from alkyl acrylates, alkyl methacrylates, and isocyanates are preferable, and (acrylates / stearyl methacrylate-20) copolymer and (acrylates / alkyl acrylate (C10-30)) cross-polymer are more preferable.

[0020] In addition, among the component (C), examples of the nonionic surfactant include glycerin fatty acid ester, polyglycerin fatty acid ester, polyoxyethylene glycerin fatty acid ester, propylene glycol fatty acid ester, sorbitan fatty acid ester, polyoxyethylene sorbitan fatty acid ester, polyoxyethylene alkyl ether, polyoxyethylene polyoxypropylene glycol, alkyl glyceryl ether, polyethylene glycol fatty acid ester, sucrose fatty acid ester, polyoxyethylene hydrogenated castor oil, alkyl alkanolamide, alkyl fatty acid alkanolamide, alkyl polyglucoside, and the like. Among these, from the viewpoint of enhancing emulsion stability, glycerin fatty acid ester, polyglycerin fatty acid ester, polyethylene glycol fatty acid ester, and alkyl polyglucoside are preferable, and polyglyceryl isostearate, polyglyceryl diisostearate, polyethylene glycol monolaurate, and decyl glucoside are more preferable.

[0021] Furthermore, from the viewpoint of improving cleaning and rinsing properties, it is preferable to use a combination of two or more nonionic surfactants with different HLB values. Preferably, one or more surfactants have an HLB of 10 or higher, more preferably 11 or higher, and even more preferably 12 or higher. Preferably, one or more surfactants have an HLB of 10 or lower, more preferably 9 or lower, and even more preferably 8 or lower. It is even more preferable to use a combination of a nonionic surfactant with an HLB of 10 or higher and a nonionic surfactant with an HLB of less than 10. The HLB of a mixed surfactant composed of two or more nonionic surfactants is preferably HLB 4 to 15, preferably HLB 5 to 14, and more preferably HLB 6 to 14, from the viewpoint of cleaning and rinsing properties. Here, HLB (Hydrophilic-Lipophilic Balance) represents the molecular weight of the hydrophilic group portion of the total molecular weight of the surfactant, and for the nonionic surfactants used in this invention, it is shown as determined by Griffin's formula. Furthermore, the HLB of a mixed surfactant composed of two or more nonionic surfactants can be determined as follows: The HLB of the mixed surfactant is obtained by averaging the HLB values ​​of each nonionic surfactant based on their respective blending ratios.

[0022] Mixed HLB=Σ(HLBx×Wx) / ΣWx HLBx indicates the HLB value of the nonionic surfactant X. Wx represents the mass (g) of the nonionic surfactant X having an HLBx value.

[0023] The emulsifier in component (C) can be used individually or in combination of two or more types. A polymer and a nonionic surfactant can also be used in combination to improve rinsability. From the viewpoint of emulsification stability and rinsability, the content of component (C) is preferably 0.4% by mass or more, more preferably 0.6% by mass or more, even more preferably 1.2% by mass or more, preferably 50% by mass or less, more preferably 30% by mass or less, and even more preferably 20% by mass or less. Furthermore, the content of component (C) is preferably 0.4 to 50% by mass, more preferably 0.6 to 30% by mass, and even more preferably 1.2 to 20% by mass.

[0024] The component (D) used in this invention is a liquid oil at 25°C. "Liquid at 25°C" means that it has fluidity at 25°C, and this includes paste-like substances. The oils in component (D) are those commonly used in cosmetics, such as linear or branched hydrocarbon oils like petrolatum, hydrogenated polydecene, light isoparaffin, liquid paraffin, liquid isoparaffin, squalane, and squalene; monoester oils like ethylhexyl paramethoxycinnamate, isocetyl myristate, octyldodecyl myristate, isotridecyl isononanoate, and isononyl isononanoate; diester oils like neopentyl glycol dicaprate, propylene glycol dicaprate, and diisostearyl malate; triethylhexanoin, glyceryl tri-2-ethylhexanoate, caprylic / capric triglyceride, olive oil, jojoba oil, macadamia nut oil, and meadowfoam. Examples include oils, triester oils such as castor oil, safflower oil, sunflower oil, avocado oil, canola oil, apricot kernel oil, rice germ oil, and rice bran oil; tetraester oils such as dipentaerythrityl tetraisostearate; ether oils such as cetyldimethylbutyl and dicaprylyl ether; higher alcohols such as octyldodecanol; phytosteryl / octyldodecyl lauroyl glutamate; silicone oils such as dimethylpolysiloxane, caprylyl methicone, methylphenylpolysiloxane, diphenylsiloxyphenyl trimethicone, methylhydrogenpolysiloxane, and higher alcohol-modified organopolysiloxane; and fluorine oils such as fluoropolyethers and perfluoroalkyl ether silicones. Of these, hydrocarbon oils, ester oils, and ether oils are preferred from the viewpoint of cleaning properties and usability, and squalane, isononyl isononanoate, light isoparaffins, cetyldimethylbutyl, and dicaprylyl ether are more preferred.

[0025] The oily component (D) can be used in combination of one or more types. From the viewpoint of cleaning performance, its content is 5% by mass or more of the total composition, preferably 7.5% by mass or more, more preferably 10% by mass or more, 50% by mass or less, preferably 40% by mass or less, and even more preferably 30% by mass or less. Furthermore, the content of component (D) is 5 to 50% by mass of the total composition, preferably 7.5 to 40% by mass, and more preferably 10 to 30% by mass.

[0026] The water content of component (E) used in the present invention is preferably 0.1% by mass or more, more preferably 1% by mass or more, more preferably 1.5% by mass or more, less preferably 10% by mass or less, less preferably 6% by mass or less, and more preferably 5% by mass or less, from the viewpoint of washability and emulsification stability. Furthermore, the water content of component (E) is preferably 0.1 to 10% by mass, more preferably 1 to 10% by mass, more preferably 1 to 6% by mass, and even more preferably 1.5 to 5% by mass, from the viewpoint of washability and emulsification stability.

[0027] The skin cleansing composition of the present invention may further contain polyols other than component (A). The skin cleansing composition of the present invention may further contain glycerin, which can further improve emulsification stability and cleansing properties. From the viewpoint of emulsification stability and washability, the glycerin content is preferably 1% by mass or more in the total composition, more preferably 10% by mass or more, preferably 60% by mass or less, more preferably 50% by mass or less, and even more preferably 40% by mass or less. Furthermore, the glycerin content is preferably 1 to 60% by mass in the total composition, more preferably 1 to 50% by mass, and even more preferably 10 to 40% by mass.

[0028] In the present invention, the mass ratio of glycerin to component (A), (glycerin) / (A), is preferably 5 or less, more preferably 4 or less, and even more preferably 3 or less, from the viewpoint of low-temperature usability and cleanability.

[0029] The skin cleansing composition of the present invention may further contain polyols other than component (A) and glycerin. Examples of such polyols include dihydric alcohols such as ethylene glycol, diethylene glycol, hexylene glycol, polyethylene glycol, propylene glycol, isoprene glycol, 1,3-propanediol, dipropylene glycol, and polypropylene glycol; trihydric or higher alcohols such as diglycerin and triglycerin; and sugars or sugar alcohols such as erythritol, pentaerythritol, maltitol, xylitol, sorbitan, and sorbitol. Of these, dihydric alcohols are preferred from the viewpoint of emulsification stability, and dipropylene glycol, isoprene glycol, and 1,3-propanediol are more preferred.

[0030] Component (A) and polyols other than glycerin can be used individually or in combination of two or more types. From the viewpoint of washability and emulsification stability, the content is preferably 30% by mass or more, more preferably 40% by mass or more, even more preferably 50% by mass or more, preferably 90% by mass or less, more preferably 80% by mass or less, and even more preferably 70% by mass or less. Furthermore, the content of polyols other than component (A) and glycerin is preferably 30 to 90% by mass, more preferably 40 to 80% by mass, and even more preferably 50 to 70% by mass.

[0031] Furthermore, as a polyol other than component (A) and glycerin, the composition may contain methyl glucose to which polyethylene glycol or polypropylene glycol has been added, which reduces the viscosity of the composition at low temperatures and provides a moist feeling after rinsing. Specifically, examples include polyoxyethylene methyl glucoside and polyoxypropylene methyl glucoside. The number of moles of polyethylene glycol or polypropylene glycol added to methyl glucose is preferably 5 to 25, and more preferably 10 to 25.

[0032] From the viewpoint of low-temperature usability and rinseability, the content of methyl glucose to which polyethylene glycol or polypropylene glycol has been added is preferably 5% by mass or more, and more preferably 5 to 20% by mass, in the total composition.

[0033] In the present invention, the mass ratio of glycerin to the total amount of component (A) and polyols other than glycerin ((glycerin)) is preferably 2 or less, more preferably 1.5 or less, and even more preferably 1.2 or less, from the viewpoint of low-temperature usability and rinseability.

[0034] In addition to the components mentioned above, the skin cleansing composition of the present invention may further contain components commonly used in ordinary cleansers, such as surfactants other than those mentioned above, moisturizers, oily components, bactericides, anti-inflammatory agents, preservatives, chelating agents, thickeners, salts, pearlescent agents, scrubbing agents, fragrances, cooling agents, pigments, UV absorbers, antioxidants, plant and animal extracts, etc. Furthermore, the skin cleansing composition of the present invention may further contain vitamins such as tocopherol acetate, tocopherol, DL-α-tocopherol acetate (vitamin E), riboflavin (vitamin B2), retinol, β-carotene, etc. (vitamin A).

[0035] The skin cleansing composition of the present invention can be manufactured by conventional methods. From the viewpoint of usability, the skin cleansing composition of the present invention preferably has a viscosity of 20,000 mPa·s or less at 30°C, and more preferably 1,000 to 15,000 mPa·s. Furthermore, the viscosity at 5°C is preferably 30,000 mPa·s or less, more preferably 25,000 mPa·s or less, and even more preferably 20,000 mPa·s or less. In this invention, viscosity is measured using a BM-type viscometer under conditions of 12 revolutions per minute and 1 minute of rotation. [Examples]

[0036] Examples 1-17 and Comparative Examples 1-7 Skin cleansing compositions with the compositions shown in Tables 1 to 3 were prepared, and their viscosity was measured at 30°C and 5°C. Their appearance, makeup removal properties, and rinsability were also evaluated. The results are shown in Tables 1 to 3.

[0037] (Manufacturing method) Component (A) was heated to 60°C, and component (B) was dissolved in component (A). Then, component (C) was mixed in, and component (E) and all components except component (D) were mixed in. Finally, component (D) was added and mixed to obtain a skin cleansing composition.

[0038] (Evaluation method) (1) Viscosity: Viscosity was measured at 30°C and 5°C using a BM-type viscometer under conditions of 12 revolutions / minute and 1 minute.

[0039] (2) Appearance: Each skin cleansing agent composition was left to stand for at least 24 hours after manufacturing, and then its appearance was visually observed to evaluate whether it was separated or homogeneous.

[0040] (3) Makeup removal: Apply lipstick (Sofina Aube Timeless Color Lip (02)) 10 times to a piece of artificial leather (Okamoto Chemical Co., Ltd., Laforet S2923 white) to create a diameter of 20mm, and leave for 30 minutes or more. The area was dried. 0.2 mL of each skin cleansing agent composition was dropped onto the application area, and the area was massaged in for 5 seconds while applying approximately 30 g of pressure with a fingertip, rotating it about 10 times. Then, it was rinsed with running water. The degree to which the lipstick was removed after rinsing was observed visually and indicated according to the following criteria. If the skin cleansing agent composition had separated, the container was shaken 10 times to mix uniformly, and the evaluation was performed within 1 minute. ◎: Her lipstick has come off. ○: The lipstick is almost completely gone, but a small amount remains around the edges and in the texture of the lips. △: Lipstick is still visible. ×: The lipstick has barely come off.

[0041] (4) Rinsing properties: Each skin cleansing composition was applied to the inner side of the forearm, massaged 10 times, and then rinsed with running water. The condition after placing an oil-blotting paper on top was then described according to the following criteria. ◎: The oil-blotting paper doesn't stick and doesn't change color. ○: The oil-blotting paper doesn't stick, but there are areas where the color changes. △: Oil-blotting paper sticks to some areas, causing discoloration. ×: The oil-blotting paper sticks to the surface and changes color.

[0042] [Table 1]

[0043] [Table 2]

[0044] [Table 3]

Claims

1. The following components (A), (B), (C), (D), and (E): (A) 1,3-butylene glycol 10 to 80% by mass, (B) Trimethylglycine 4-19% by mass, (C) Emulsifier, (D) Liquid oil at 25°C, 7.5 to 50% by mass. (E) Water 0.1-10% by mass A skin cleansing composition containing the following:

2. The skin cleansing composition according to claim 1, wherein the mass ratio (A) / (B) of component (A) to component (B) is 1.2 or more.

3. Furthermore, the skin cleansing composition according to claim 1 or 2, further containing a polyol other than component (A).

4. Furthermore, the skin cleansing composition according to any one of claims 1 to 3, wherein the composition contains glycerin, and the mass ratio of glycerin to component (A) (glycerin) / (A) is 5 or less.

5. Furthermore, the skin cleansing composition according to any one of claims 1 to 4, wherein the composition contains glycerin, and the mass ratio of glycerin to the total amount of component (A) and polyols other than glycerin (glycerin) / ((A) + (polyols other than glycerin)) is 2 or less.

6. A skin cleansing composition according to any one of claims 1 to 5, wherein component (C) comprises a copolymer composed of two or more monomers selected from alkyl acrylate, alkyl methacrylate, and isocyanate.

7. A skin cleansing composition according to any one of claims 1 to 6, wherein component (C) contains a nonionic surfactant.

8. A skin cleansing composition according to any one of claims 1 to 7, wherein component (C) comprises a nonionic surfactant with an HLB of 10 or higher and a nonionic surfactant with an HLB of less than 10.

9. Furthermore, the skin cleansing composition according to any one of claims 1 to 8, further comprising methyl glucose to which polyethylene glycol or polypropylene glycol has been added.

10. A skin cleansing composition according to any one of claims 1 to 9, wherein the viscosity at 30°C is 20,000 mPa·s or less.

11. A skin cleansing composition according to any one of claims 1 to 10, wherein the viscosity at 5°C is 30,000 mPa·s or less.

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