Aerosol cosmetics

Abstract

To provide an aerosol cosmetic that suppresses the volatilization of carbonic acid gas from bubbles sprayed from a container, contains a high density of carbonic acid gas in the bubbles, and improves the treated skin to be uniformly red and clear.SOLUTION: An aerosol cosmetic comprises: a base liquid including ingredient (A), which is a water-soluble thickener, and ingredient (G), which is water, and having a pH of 7.1-10; and carbonic acid gas (C). The aerosol cosmetic, immediately after having been sprayed, has a pH of 6-7.0.SELECTED DRAWING: None

Description

[Technical Field]

[0001] The present invention relates to an aerosol cosmetic preparation. [Background technology]

[0002] Skin problems such as dark circles under the eyes and dullness are believed to be caused by reduced blood flow, and cosmetics that utilize the effects of carbon dioxide gas are being considered to improve these conditions. For example, Patent Document 1 describes that an aerosol cosmetic product that uses a specific combination of dimethylpolysiloxane and polyethylene glycol in a specific ratio, as well as a water-soluble thickener, a specific surfactant, and carbon dioxide gas, suppresses the evaporation of carbon dioxide gas, and leaves the skin non-sticky after application, with an excellent feel in use, including smoothness and softness. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Publication No. 2020-2126 Summary of the Invention [Problem to be solved by the invention]

[0004] Conventional carbon dioxide-containing aerosol cosmetics can temporarily improve blood circulation in the skin when applied to the skin, but it is difficult to achieve sustained skin brightening. [Means for solving the problem]

[0005] The inventors have discovered that by adjusting the concentrate solution of an aerosol cosmetic to a specific pH, the solubility as carbonate ions is improved, the concentration of carbon dioxide gas after spraying is increased, and evaporation is suppressed, thereby enabling a continuous supply of carbon dioxide gas to the skin, not only making the skin uniformly red, but also realizing new value in that the L value remains high even over time, brightening the skin.

[0006] The present invention relates to a composition comprising the following components (A) and (G): (A) a water-soluble thickener, (G)Water and a stock solution having a pH of 7.1 or more and 10 or less; (C) Carbon dioxide An aerosol cosmetic comprising: The present invention relates to an aerosol cosmetic in which the pH of the cosmetic immediately after spraying is 6 or more and 7.0 or less. [Effects of the Invention]

[0007] The aerosol cosmetic of the present invention suppresses the evaporation of carbon dioxide gas from the foam sprayed from the container, and the carbon dioxide gas concentration in the foam is high, allowing for a continuous supply of carbon dioxide gas to the skin. After application, the skin shows a large increase in ΔL as well as Δa, improving the skin to a uniformly reddened and brighter appearance. ΔL remains high even over time, allowing for sustained brightness. [Brief explanation of the drawings]

[0008] [Figure 1] FIG. 1 is a diagram showing a method for measuring the evaporation rate and amount of carbon dioxide gas evaporated in Examples 1 to 11 and Comparative Examples 1 and 2. [Figure 2] FIG. 1 is a diagram showing a method for measuring the carbon dioxide concentration of a cosmetic after spraying in Test Example 1. [Figure 3] 1 is a graph showing the carbon dioxide concentration of a cosmetic immediately after spraying in Test Example 1. FIG. [Figure 4] 1 is a graph showing the carbon dioxide concentration of a cosmetic 20 minutes after spraying in Test Example 1. FIG. [Figure 5] FIG. 1 is a graph showing the redness (Δa value) of the skin when the aerosol cosmetic preparation was applied to the skin in Test Example 2. [Figure 6] FIG. 1 is a graph showing the skin brightness (ΔL value) when an aerosol cosmetic preparation was applied to the skin in Test Example 2. [Figure 7] FIG. 1 is a graph showing the redness (visual observation) of the skin when the aerosol cosmetic preparation was applied to the skin in Test Example 2. [Figure 8]FIG. 1 is a graph showing the brightness (visual) of the skin when the aerosol cosmetic preparation was applied to the skin in Test Example 2. DETAILED DESCRIPTION OF THE INVENTION

[0009] The component (A) used in the present invention is a water-soluble thickener, and preferably contains an anionic polymer. The anionic polymer of component (A) used in the present invention may be any polymer commonly used in cosmetics, such as polyacrylic acid, polymethacrylic acid, acrylic acid / alkyl acrylate copolymer, carboxyvinyl polymer, carboxymethyl cellulose, carrageenan, xanthan gum, polystyrene sulfonate, agar, ghatti gum, karaya gum, pectin, alginate salt, hyaluronic acid or its alkali metal salt, etc. Of these, from the viewpoint of suppressing bubble collisions and retaining carbon dioxide gas, acrylic acid-based polymers are preferred, acrylic acid / alkyl acrylate copolymers and carboxyvinyl polymers are more preferred, and it is even more preferred to include at least one selected from (acrylic acid / alkyl acrylate (C10-30)) copolymers and carboxyvinyl polymers. Here, the (acrylic acid / alkyl acrylate (C10-30)) copolymer refers to a copolymer of C10-30 alkyl acrylic acid with acrylic acid, methacrylic acid, or a lower alkyl ester thereof, which is crosslinked with an allyl ether of sucrose or an allyl ether of pentaerythritol, and commercially available products such as Pemulen TR-1, Pemulen TR-2, Carbopol ETD2020, Carbopol 1342, and Carbopol 1382 (all manufactured by Lubrizol Advanced Materials) can be used. Furthermore, water-soluble thickeners other than anionic polymers may be any of those commonly used in cosmetics, such as dextrin, methyl cellulose, ethyl cellulose, hydroxyethyl cellulose, hydroxypropyl cellulose, and polyvinyl alcohol.

[0010] One or more types of component (A) can be used, and the content in the concentrate is preferably 0.1% by mass or more, more preferably 0.15% by mass or more, even more preferably 0.2% by mass or more, even more preferably 0.25% by mass or more, and preferably 3% by mass or less, more preferably 2% by mass or less, even more preferably 1% by mass or less, and even more preferably 0.8% by mass or less, from the viewpoint of suppressing bubble collision and retaining carbon dioxide gas. The content of component (A) in the concentrate is preferably 0.1 to 3% by mass, more preferably 0.15 to 2% by mass, even more preferably 0.2 to 1% by mass, and even more preferably 0.25 to 0.8% by mass.

[0011] The stock solution preferably further contains (B) a base. Examples of the base of component (B) include hydroxides of alkali metal salts such as potassium hydroxide and sodium hydroxide; hydroxides of alkaline earth metals such as magnesium hydroxide and calcium hydroxide; alkanolamines such as 2-amino-2-methyl-1-propanol, monoethanolamine, diethanolamine, and triethanolamine; basic amino acids such as L-arginine, lysine, and ornithine; ammonia water, ammonium hydroxide, sodium bicarbonate, potassium monohydrogen phosphate, and sodium monohydrogen phosphate. As component (B), it is preferable to include at least one selected from potassium hydroxide, sodium hydroxide, potassium monohydrogen phosphate, and sodium monohydrogen phosphate, from the viewpoint that adjusting the concentrate solution of the aerosol cosmetic to a specific pH improves its dissolving ability as carbonate ions, improves the concentration of carbon dioxide gas after spraying, and suppresses volatilization.

[0012] One or more types of component (B) can be used, and the content in the concentrate is preferably 0.1% by mass or more, more preferably 0.15% by mass or more, even more preferably 0.17% by mass or more, even more preferably 0.2% by mass or more, and preferably 2% by mass or less, more preferably 1.5% by mass or less, even more preferably 1% by mass or less, and even more preferably 0.8% by mass or less, from the viewpoints of improving the solubility as carbonate ions in the concentrate of the aerosol cosmetic, improving the concentration of carbon dioxide gas after spraying, and suppressing volatilization. The content of component (B) in the concentrate is preferably 0.1 to 2% by mass, more preferably 0.15 to 1.5% by mass, even more preferably 0.17 to 1% by mass, and even more preferably 0.2 to 0.8% by mass.

[0013] In the aerosol cosmetic of the present invention, the concentrate may further contain (D) an oil component that is liquid at 25°C, which increases the solubility of carbon dioxide gas, improves its penetration into the skin, and improves the skin's uniform redness and brightness after application. "Liquid" means one that has fluidity at 25°C, and includes paste-like forms. The oil component that is liquid at 25°C is not limited as long as it is one that is used in ordinary cosmetics, and examples thereof include silicone oils such as dimethylpolysiloxane, dimethylcyclopolysiloxane, methylphenylpolysiloxane, methylhydrogenpolysiloxane, and higher alcohol-modified organopolysiloxane; hydrocarbons such as paraffin, squalane, and squalene; natural animal and vegetable oils mainly composed of triglycerides such as camellia oil, jojoba oil, olive oil, macadamia nut oil, avocado oil, and olive oil; glycerin monostearate, glycerin distearate, glycerin monooleate, isopropyl palmitate, isopropyl stearate, butyl stearate, isopropyl myristate, diethyl phthalate, myristyl lactate, cetyl myristate, cetyl lactate, cetyl 2-ethylhexanoate, 2-ethylhexyl palmitate, 2-octyldodecyl myristate, oleic acid ester, glycerin monooleate ... Monoester oils of alkyl benzoates (alkyl groups having 12 to 15 carbon atoms) such as 2-octyldodecyl phosphate, glycerol triisostearate, glyceryl di-paramethoxycinnamate-mono-2-ethylhexanoate, isotridecyl isononanoate, glyceryl monoisostearate monomyristate, and alkyl benzoates (alkyl groups having 12 to 15 carbon atoms); diisopropyl adipate, diisobutyl adipate, neopentyl glycol dicaprate, tri(caprylic / capric acid)glyceryl, tricaprylic / capric acid Examples include diester oils such as glycerin di-2-ethylhexanoate, neopentyl glycol di-2-ethylhexanoate, dicaprylic / capric acid dipropanediol, 1-isostearoyl-3-myristoylglycerol, diisostearyl malate, and di(cholesteryl octyldodecyl) N-lauroyl-L-glutamate; ether oils such as alkyl-1,3-dimethylbutyl ether and dicaprylyl ether; and essential oils such as eucalyptus oil and peppermint oil.

[0014] Of these, from the viewpoints of increasing the solubility of carbon dioxide gas, improving its penetration into the skin, and improving the skin after application to a uniformly red and bright skin, silicone oil, monoester oil, diester oil, and triester oil are preferred, and it is more preferred to include at least liquid silicone oil. The liquid silicone oil may be any that is commonly used in cosmetics, but preferably contains dimethylpolysiloxane with a viscosity of 6 to 5,000 mPa·s at 25°C. From the viewpoint of suppressing carbon dioxide volatilization and enhancing its effect on the skin, the dimethylpolysiloxane preferably has a viscosity of 10 mPa·s or more at 25°C. From the viewpoint of preventing stickiness after application, the viscosity is preferably 1,000 mPa·s or less, more preferably 500 mPa·s or less. Furthermore, the viscosity at 25°C is preferably 10 to 1,000 mPa·s, more preferably 10 to 500 mPa·s. The viscosity was measured using a BM viscometer (manufactured by Toki Sangyo Co., Ltd.) with rotor No. 3 at 12 rpm for 1 minute if the viscosity was 10,000 mPa·s or less, and with rotor No. 4 at 12 rpm for 1 minute if the viscosity exceeded 10,000 mPa·s.

[0015] Component (D) can be used alone or in combination with other components, and the content in the concentrate is preferably 0.1% by mass or more, more preferably 0.5% by mass or more, even more preferably 1% by mass or more, and preferably 20% by mass or less, more preferably 15% by mass or less, and even more preferably 10% by mass or less, from the viewpoints of increasing the solubility of carbon dioxide gas, improving skin penetration, and improving the skin after application to a uniformly reddened and brightened appearance. The content of component (D) in the concentrate is preferably 0.1 to 20% by mass, more preferably 0.5 to 15% by mass, and even more preferably 1 to 10% by mass.

[0016] The aerosol cosmetic of the present invention may further contain a component (E) polyhydric alcohol in the concentrate from the viewpoints of suppressing the volatilization of carbon dioxide gas and improving the feel after application. The polyhydric alcohol preferably contains a dihydric or trihydric alcohol. Examples of dihydric alcohols include ethylene glycol, diethylene glycol, polyethylene glycol (number average molecular weight less than 10,000), propylene glycol, dipropylene glycol, polypropylene glycol, propanediol, 1,3-butylene glycol, and 1,3-propanediol. Examples of trihydric alcohols include glycerin, diglycerin, and polyglycerin. Another example is polyoxybutylene polyoxyethylene polyoxypropylene glyceryl ether (3B.O.), (8E.O.), and (5P.O.) (NOF Corporation, Wilbride S-753). Among these, it is preferable to use one or more selected from polyethylene glycol, dipropylene glycol, and 1,3-propanediol.

[0017] The polyhydric alcohol component (E) can be one or more types, and from the viewpoint of suppressing carbon dioxide gas evaporation and providing smoothness to the skin, the content in the concentrate is preferably 1% by mass or more, more preferably 1.5% by mass or more, even more preferably 2% by mass or more, and preferably 25% by mass or less, more preferably 20% by mass or less, and even more preferably 16% by mass or less. The content of component (E) in the concentrate is preferably 1 to 25% by mass, more preferably 1.5 to 20% by mass, and even more preferably 2 to 16% by mass.

[0018] The aerosol cosmetic of the present invention may further contain a surfactant as component (F) in the concentrate, which can make the bubbles produced when carbon dioxide gas is sprayed finer and improve the retention of the bubbles. The surfactant may be any surfactant that is commonly used in cosmetics, such as a nonionic surfactant, an anionic surfactant, or a cationic surfactant. The nonionic surfactant preferably contains one or more surfactants having an HLB of 2 to 20, and preferably uses those having an HLB of 2 to 10 or HLB of 12 to 18 alone or in combination. Here, HLB (Hydrophilic-Lipophilic Balance) indicates the molecular weight of the hydrophilic group portion in the total molecular weight of the surfactant, and for nonionic surfactants, it can be calculated using Griffin's formula.

[0019] Examples of nonionic surfactants with an HLB of 12 to 18 include polyglycerin fatty acid esters, polyethylene glycol fatty acid esters, sucrose fatty acid esters, polyoxyethylene fatty acid esters, polyoxyethylene sorbitan fatty acid esters, polyoxyethylene alkyl ethers, polyoxyethylene sorbitol fatty acid esters, polyoxyethylene glycerin fatty acid esters, polyoxyethylene propylene glycol fatty acid esters, polyoxyethylene castor oil, polyoxyethylene hydrogenated castor oil, polyoxyethylene hydrogenated castor oil fatty acid esters, polyoxyethylene phytostanol ether, polyoxyethylene phytosterose ether, polyoxyethylene cholestanol ether, polyoxyethylene cholesteryl ether, polyoxyalkylene-modified organopolysiloxanes, and polyoxyalkylene-alkyl co-modified organopolysiloxanes. One or more surfactants selected from these may be used. Among these, polyoxyethylene alkyl ether and polyoxyethylene hydrogenated castor oil are preferred from the viewpoint of foaming properties when carbon dioxide gas is sprayed.

[0020] From the viewpoint of stability of the stock solution, the content of the nonionic surfactant of HLB12 to 18 in the stock solution is preferably 0.05 to 10 mass %, more preferably 0.1 to 4 mass %, and even more preferably 0.2 to 2 mass %.

[0021] Examples of nonionic surfactants with an HLB of 2 to 10 include sorbitan fatty acid esters having 8 to 22 carbon atoms; alkyl glyceryl ethers such as isostearyl glyceryl ether; and polyoxyalkylene-modified silicones.

[0022] Examples of sorbitan fatty acid esters include sorbitan monopalmitate, sorbitan monostearate, sorbitan monooleate, sorbitan sesquioleate, sorbitan coconut oil fatty acid, and sorbitan tristearate. Commercially available products that can be used include Rheodol SP-P10 (HLB 6.7) as sorbitan monopalmitate, Rheodol SP-S10V (HLB 4.7) as sorbitan monostearate, Rheodol SP-O10V (HLB 4.3) as sorbitan monooleate, Rheodol AO-15V (HLB 3.7) as sorbitan sesquioleate, Rheodol SP-L10 (HLB 8.6) as sorbitan coconut oil fatty acid, and SP-S30V (HLB 2.1) as sorbitan tristearate (all manufactured by Kao Corporation).

[0023] Examples of polyoxyalkylene-modified silicones include polyoxyethylene-methylpolysiloxane copolymers and poly(oxyethylene-oxypropylene)-methylpolysiloxane copolymers. Commercially available products that can be used include "KF-6015" (PEG-3 dimethicone) (HLB 4.5) and "KF-6019" (PEG-9 dimethicone) (HLB 4.5) sold by Shin-Etsu Chemical Co., Ltd., and "SH-3775M" (PEG-12 dimethicone) (HLB 5) and "SH-3773M" (PEG-12 dimethicone) (HLB 8) sold by Dow Corning Toray Silicones Co., Ltd.

[0024] The content of the nonionic surfactant with an HLB of 2 to 10 in the concentrate is preferably 0.01 to 2 mass %, more preferably 0.05 to 1 mass %. In the present invention, it is more preferable to use, as the nonionic surfactant, one or more selected from polyoxyethylene alkyl ethers and polyoxyethylene hydrogenated castor oils having an HLB of 12 to 18 in combination with polyoxyalkylene-modified silicones having an HLB of 2 to 10 in terms of foaming during injection of carbon dioxide gas, foam uniformity, and foam wettability.

[0025] Examples of anionic surfactants include alkyl sulfates or salts thereof having 12 to 22 carbon atoms, such as sodium lauryl sulfate and potassium lauryl sulfate, polyoxyethylene alkyl ether phosphates or salts thereof having 12 to 22 carbon atoms, such as sodium polyoxyethylene lauryl ether phosphate, dialkyl sulfosuccinates or salts thereof having 12 to 24 carbon atoms, N-alkyloylmethyl taurines or salts thereof having 12 to 22 carbon atoms, and N-acyl glutamic acids or salts thereof having 12 to 22 carbon atoms. Of these, polyoxyethylene alkyl ether phosphates or salts thereof and acyl glutamic acids or salts thereof are preferred from the viewpoints of emulsion stability and generation of a large amount of bubbles during spraying. When an anionic surfactant is contained, the content in the stock solution is preferably 0.01 to 1 mass %, more preferably 0.05 to 0.7 mass %.

[0026] The aerosol cosmetic of the present invention further contains component (G) water in the concentrate. Component (G) water acts as a solvent for the concentrate and constitutes the balance of the other components. From the viewpoints of improving the solubility of carbonate ions in the concentrate and achieving excellent emulsion stability, the water content in the concentrate is preferably 55 to 99% by mass, more preferably 65 to 95% by mass, and even more preferably 70 to 90% by mass.

[0027] In the aerosol cosmetic of the present invention, the concentrate may further contain ingredients used in ordinary cosmetics, such as polymers other than those mentioned above, oil components other than those mentioned above, ethanol, preservatives, antioxidants, pigments, pH adjusters, fragrances, ultraviolet absorbers, moisturizers, blood circulation promoters, cooling agents, antiperspirants, disinfectants, whitening agents, anti-inflammatory agents, and skin activators.

[0028] In the aerosol cosmetic of the present invention, the concentrate is prepared by mixing the components (A) and (G) with other ingredients. From the viewpoints of suppressing the evaporation of carbonated bubbles and having a viscosity appropriate for application to the skin, the concentrate preferably has a viscosity at 25°C of 1000 to 10000 mPa·s, more preferably 1500 to 8500 mPa·s, even more preferably 2000 to 7000 mPa·s, and even more preferably 3000 to 7000 mPa·s. Here, the viscosity was measured using a BM viscometer (manufactured by Toki Sangyo Co., Ltd.) with rotor No. 3 at 12 rpm for 1 minute, and when the viscosity exceeded 10,000 mPa·s, the value was measured with rotor No. 4 at 12 rpm for 1 minute.

[0029] The aerosol cosmetic of the present invention has improved solubility as carbonate ions in the concentrate of the aerosol cosmetic, improved carbon dioxide gas concentration after spraying, and suppressed volatilization, and after application, the skin shows a large increase in ΔL in addition to Δa, improving the skin to a uniformly reddened and brighter appearance. From the viewpoint of maintaining a high ΔL over time and maintaining brightness, the concentrate has a pH of 7.1 or more and 10 or less, preferably 7.1 to 9.5, and more preferably 7.1 to 9. In the present invention, the pH of the stock solution is measured at 25°C using a pH / ION-METER F-72 manufactured by HORIBA.

[0030] The aerosol cosmetic of the present invention can be produced by filling a pressure-resistant container with the above-mentioned concentrate and (C) carbon dioxide gas. The spray form is preferably a foam type, in which the cosmetic is sprayed in the form of foam. The mass ratio of the concentrate to carbon dioxide gas is preferably 94:6 to 99.5:0.5, more preferably 95:5 to 99:1, and even more preferably 96.5:3.5 to 98.5:1.5, from the viewpoint of excellent carbon dioxide gas foam generation and improving the skin after application to a uniformly red and bright skin.

[0031] The aerosol cosmetic of the present invention may contain a propellant used in ordinary aerosol cosmetics in addition to carbon dioxide gas as component (C). Examples of propellants include liquefied petroleum gas and compressed gas. When a propellant other than carbon dioxide gas is contained, the content of carbon dioxide gas relative to the total amount of carbon dioxide gas and propellant is preferably 85% by mass or more, more preferably 90% by mass or more, even more preferably 95% by mass or more, and even more preferably 98% by mass or more. In the present invention, it is preferable that no propellant other than carbon dioxide gas is contained, or if a propellant other than carbon dioxide gas is contained, the content of carbon dioxide gas relative to the total amount of carbon dioxide gas and propellant is 85 mass% or more.

[0032] From the viewpoints of suppressing the evaporation of carbon dioxide gas, increasing the carbon dioxide gas concentration, and continuously supplying carbon dioxide gas to the skin, the aerosol cosmetic of the present invention has a pH of 6 or more and 7.0 or less immediately after spraying, preferably a pH of 6 to 6.9, and more preferably a pH of 6.1 to 6.8. In the present invention, the pH of the cosmetic immediately after spraying is measured by filling the cosmetic into a glass container while spraying it from an aerosol container, and measuring it at 25°C using a pH / ION-METER F-72 manufactured by HORIBA. The measurement is carried out immediately after spraying from the aerosol container, and the value measured one minute later is used.

[0033] The aerosol cosmetic of the present invention can be used as a cosmetic without any particular restrictions, but is suitable as a skin cosmetic because the evaporation of carbon dioxide gas in the cosmetic after spraying is suppressed, the carbon dioxide gas concentration is high, and the carbon dioxide gas acts effectively on the skin after application. The aerosol cosmetic of the present invention can be used according to the situation of use, for example, by applying it to the skin, leaving it for a certain period of time, allowing it to blend into the skin, wiping it off, or rinsing it off.

[0034] The aerosol cosmetic of the present invention can be produced by a conventional method, for example, by the following steps 1 to 4. Step 1: Aqueous phase components containing (A) anionic polymer, (G) water, and (B) a base were heated to 50° C. or higher and dispersed using a disperser. Step 2: To the aqueous phase obtained in Step 1, oil phase components including (D) oil solution and (F) surfactant were added, and the mixture was dispersed using a disper and then stirred using a homomixer. Step 3: The liquid obtained in step 2 was cooled to 15 to 30°C, and then other ingredients such as flavorings were added as needed, followed by stirring to obtain a stock solution. Step 4: The stock solution obtained in step 3 is filled into a pressure-resistant container, which is then sealed, and component (C) is then filled in by pressurization.

[0035] In relation to the above-mentioned embodiment, the present invention further discloses the following composition.

[0036] <1> The following components (A) and (G): (A) a water-soluble thickener, (G)Water and a stock solution having a pH of 7.1 or more and 10 or less; (C) Carbon dioxide An aerosol cosmetic comprising: An aerosol cosmetic having a pH of 6 or more and 7.0 or less immediately after spraying.

[0037] <2> The component (A) preferably contains an anionic polymer. <1> The aerosol cosmetic preparation described above. <3> The component (A) is preferably an acrylic acid-based polymer, more preferably an acrylic acid / alkyl acrylate copolymer or a carboxyvinyl polymer, and even more preferably contains at least one selected from an (acrylic acid / alkyl acrylate (C10-30)) copolymer and a carboxyvinyl polymer. <1> or <2> The aerosol cosmetic preparation described above. <4> The content of component (A) in the concentrate is preferably 0.1% by mass or more, more preferably 0.15% by mass or more, even more preferably 0.2% by mass or more, even more preferably 0.25% by mass or more, and is preferably 3% by mass or less, more preferably 2% by mass or less, even more preferably 1% by mass or less, and even more preferably 0.8% by mass or less. <1> ~ <3> The aerosol cosmetic according to any one of the above.

[0038] <5> The raw solution further contains (B) a base. <1> ~ <4> The aerosol cosmetic according to any one of the above. <6> The component (B) preferably contains at least one selected from potassium hydroxide, sodium hydroxide, potassium monohydrogen phosphate, and sodium monohydrogen phosphate. <5> The aerosol cosmetic preparation described above. <7> The content of component (B) in the concentrate is preferably 0.1% by mass or more, more preferably 0.15% by mass or more, even more preferably 0.17% by mass or more, even more preferably 0.2% by mass or more, and is preferably 2% by mass or less, more preferably 1.5% by mass or less, even more preferably 1% by mass or less, and even more preferably 0.8% by mass or less. <5> or <6> The aerosol cosmetic preparation described above.

[0039] <8> The concentrate preferably further contains (D) an oil component that is liquid at 25°C, more preferably a silicone oil, a monoester oil, a diester oil, or a triester oil, and even more preferably contains at least a liquid silicone oil. <1> ~ <7> The aerosol cosmetic according to any one of the above. <9> The liquid silicone oil is preferably a dimethylpolysiloxane having a viscosity at 25°C of 6 to 5000 mPa·s, more preferably a viscosity at 25°C of 10 to 1000 mPa·s, and even more preferably a viscosity at 25°C of 10 to 500 mPa·s. <8> The aerosol cosmetic preparation described above. <10> The content of component (D) in the concentrate is preferably 0.1% by mass or more, more preferably 0.5% by mass or more, and even more preferably 1% by mass or more, and is preferably 20% by mass or less, more preferably 15% by mass or less, and even more preferably 10% by mass or less. <8> or <9> The aerosol cosmetic preparation described above.

[0040] <11> The stock solution preferably further contains (E) a polyhydric alcohol, more preferably a dihydric or trihydric alcohol, and even more preferably one or more selected from polyethylene glycol, dipropylene glycol, and 1,3-propanediol. <1> ~ <10> The aerosol cosmetic according to any one of the above. <12> The content of component (E) in the concentrate is preferably 1% by mass or more, more preferably 1.5% by mass or more, and even more preferably 2% by mass or more, and is preferably 25% by mass or less, more preferably 20% by mass or less, and even more preferably 16% by mass or less. <11> The aerosol cosmetic preparation described above.

[0041] <13> The stock solution preferably further contains (F) a surfactant, more preferably a nonionic surfactant, even more preferably a nonionic surfactant having an HLB of 2 to 20, and even more preferably a nonionic surfactant having an HLB of 2 to 10 or an HLB of 12 to 18, used alone or in combination. <1> ~ <12> The aerosol cosmetic according to any one of the above. <14> The nonionic surfactant having an HLB of 12 to 18 is preferably a polyoxyethylene alkyl ether or a polyoxyethylene hydrogenated castor oil; and the nonionic surfactant having an HLB of 2 to 10 is preferably a sorbitan fatty acid ester having 8 to 22 carbon atoms, an alkyl glyceryl ether, or a polyoxyalkylene-modified silicone. <13> The aerosol cosmetic preparation described above. <15> The content of the nonionic surfactant having an HLB of 12 to 18 in the concentrate is preferably 0.05 to 10% by mass, more preferably 0.1 to 4% by mass, and even more preferably 0.2 to 2% by mass. <13> or <14> The aerosol cosmetic preparation described above. <16> The content of the nonionic surfactant having an HLB of 2 to 10 in the concentrate is preferably 0.01 to 2% by mass, more preferably 0.05 to 1% by mass. <13> or <14> The aerosol cosmetic preparation described above. <17> It is preferable that the nonionic surfactant of component (F) is a combination of one or more selected from polyoxyethylene alkyl ethers and polyoxyethylene hydrogenated castor oils having an HLB of 12 to 18 and polyoxyalkylene-modified silicones having an HLB of 2 to 10. <13> ~ <16> The aerosol cosmetic according to any one of the above.

[0042] <18> The content of component (G) in the concentrate is preferably 55 to 99% by mass, more preferably 65 to 95% by mass, and even more preferably 70 to 90% by mass. <1> ~ <17> The aerosol cosmetic according to any one of the above. <19> The viscosity of the concentrate at 25°C is preferably 1000 to 10000 mPa·s, more preferably 1500 to 8500 mPa·s, even more preferably 2000 to 7000 mPa·s, and even more preferably 3000 to 7000 mPa·s. <1> ~ <18> The aerosol cosmetic according to any one of the above. <20> The stock solution preferably has a pH of 7.1 to 9.5, more preferably a pH of 7.1 to 9. <1> ~ <19> The aerosol cosmetic according to any one of the above.

[0043] <21> The method is produced by filling a pressure-resistant container with the stock solution and (C) carbon dioxide gas. <1> ~ <20> The aerosol cosmetic according to any one of the above. <22> The spray form is preferably a foam type sprayed in a foam state. <1> ~ <21> The aerosol cosmetic according to any one of the above. <23> The mass ratio of the concentrate to carbon dioxide is preferably 94:6 to 99.5:0.5, more preferably 95:5 to 99:1, and even more preferably 96.5:3.5 to 98.5:1.5. <1> ~ <22> The aerosol cosmetic according to any one of the above. <24> Preferably, the above-mentioned composition does not contain any propellant other than carbon dioxide gas, or if a propellant other than carbon dioxide gas is contained, the content of carbon dioxide gas relative to the total amount of carbon dioxide gas and the propellant is 85 mass % or more. <1> ~ <23> The aerosol cosmetic according to any one of the above. <25> The above-mentioned propellant contains a propellant other than carbon dioxide gas, and the content of carbon dioxide gas relative to the total amount of carbon dioxide gas and the propellant is preferably 85% by mass or more, more preferably 90% by mass or more, even more preferably 95% by mass or more, and even more preferably 98% by mass or more. <1> ~ <23> The aerosol cosmetic according to any one of the above. <26> The pH of the cosmetic immediately after spraying is preferably pH 6 to 6.9, more preferably pH 6.1 to 6.8. <1> ~ <25> The aerosol cosmetic according to any one of the above. <27> The above-mentioned cosmetic is a skin cosmetic. <1> ~ <26> The aerosol cosmetic according to any one of the above.

[0044] <28> The following components (A), (B), and (G): (A) 0.1 to 3 mass% of an anionic polymer selected from acrylic acid-based polymers, (B) 0.1 to 2 mass% of a base selected from potassium hydroxide, sodium hydroxide, potassium monohydrogen phosphate, and sodium monohydrogen phosphate, (G)Water and a stock solution having a pH of 7.1 or more and 10 or less; (C) Carbon dioxide An aerosol cosmetic comprising: An aerosol cosmetic having a pH of 6 or more and 7.0 or less immediately after spraying.

[0045] <29> The following components (A), (B), and (G): (A) 0.15 to 2 mass% of an anionic polymer selected from acrylic acid / alkyl acrylate copolymers and carboxyvinyl polymers, (B) 0.15 to 1.5 mass% of a base selected from potassium hydroxide, sodium hydroxide, potassium monohydrogen phosphate, and sodium monohydrogen phosphate, (G)Water and a stock solution having a pH of 7.1 to 9.5, (C) Carbon dioxide An aerosol cosmetic comprising: An aerosol cosmetic having a pH of 6 or more and 7.0 or less immediately after spraying. [Example]

[0046] Examples 1 to 11 and Comparative Examples 1 to 2 Aerosol cosmetics having the compositions shown in Tables 1 and 2 were prepared, and the viscosity and pH of the concentrate at 25°C, as well as the pH of the cosmetic immediately after spraying, were measured. In addition, carbon dioxide volatility and skin color (colorimetry, visual observation) immediately after application and 3 minutes after application were evaluated. These results are shown in Tables 1 and 2.

[0047] (Manufacturing method) Step 1: Aqueous phase components including (A) a water-soluble thickener, (G) water, (B) a base, and polyethylene glycol were heated to 58 to 68°C and dispersed using a disper. Step 2: To the aqueous phase obtained in Step 1, oil phase components including (D) oil solution, dipropylene glycol, 1,3-propanediol, and (F) surfactant were added, dispersed using a disper, and then stirred using a homomixer. Step 3: The liquid obtained in step 2 was cooled to 15 to 30°C, a flavoring agent was added, and the mixture was stirred to obtain a stock solution. Step 4: The concentrate obtained in Step 3 was filled into a pressure-resistant container and sealed, after which component (C) was added under pressure to obtain an aerosol cosmetic. 2.4 parts by mass of carbon dioxide gas was blended with 97.6 parts by mass of concentrate (concentrate:carbon dioxide = 97.6:2.4).

[0048] (Evaluation method) (1) Stock solution viscosity: 50 g of the stock solution was filled into a 50 mL glass container, and the viscosity was measured using a BM viscometer (manufactured by Toki Sangyo Co., Ltd.) (rotor No. 3, 12 rpm, 1 minute).

[0049] (2) Stock pH: 50 g of the stock solution was filled into a 50 mL glass container, and the pH was measured at 25°C using a pH / ION-METER F-72 manufactured by HORIBA.

[0050] (3) pH of the cosmetic immediately after spraying: The cosmetic was filled into a 20 mL glass container while being sprayed from an aerosol container, and the measurement was performed at 25°C using a pH / ION-METER F-72 manufactured by HORIBA. The measurement was performed immediately after spraying from the aerosol container, and the measurement value after 1 minute was used.

[0051] (4) Carbon dioxide volatility: (4-1) Carbon dioxide evaporation rate: As shown in Figure 1, each aerosol cosmetic was placed in a cylindrical glass container (volume 19 cm 3After spraying approximately 1 gf into the container, a carbon dioxide electrode CE-2041 (manufactured by DKK-TOA Corporation) was inserted without touching the cosmetic, and the carbon dioxide concentration was immediately measured with the glass container sealed. The measuring device (carbonate ion concentration meter) was an ION / pH METER IM-32P. Measurement was started immediately after injection, and the change in carbon dioxide concentration over the four minutes from 1 minute to 5 minutes after the start of measurement was calculated to determine the rate of carbon dioxide volatilization (ppm / min).

[0052] (4-2) Carbon dioxide volatilization rate: In the same manner as in (4-1), the carbon dioxide concentration was measured 10 minutes and 20 minutes after the start of the measurement.

[0053] (5) Skin color evaluation (colorimetric value): A cup shaker (3.4 cm in diameter) was attached to the inside of the forearm, and 0.5 g of the cosmetic was sprayed directly from the aerosol container into the cup shaker, and then applied by spreading it as evenly as possible with a spatula. After application, the cosmetic was left on for 2 minutes and then wiped off with tissue paper. The a and L values ​​of the skin before and after application of the cosmetic were measured using a colorimeter CM2600d (manufactured by Konica Minolta, Inc.) Measurements were repeated three times on one site, and measurements were taken immediately after the cosmetic was removed and three minutes later. The measured a and L values ​​were used to calculate the average values ​​of three measurements, and the difference Δa and ΔL values ​​from before application were calculated.

[0054] (6) Skin color evaluation (visual): When measuring the above colorimetric values, the redness and brightness of the skin were visually evaluated according to the following criteria, and the average values ​​of three measurements were calculated. 2;Very red / very bright. 1.5; Between very red and red / between very light and light. 1;Red / Bright. 0.5: Slightly red / slightly bright. 0: Same as before application.

[0055] [Table 1]

[0056] [Table 2]

[0057] Examples 12 to 17 Aerosol cosmetics having the compositions shown in Tables 3 and 4 were produced in the same manner as in Examples 1 to 11, and the viscosity and pH of the concentrate at 25°C, as well as the pH of the cosmetic immediately after spraying, were measured. The results are also shown in Tables 3 and 4. All of the cosmetics of Examples 12 to 17 suppress the evaporation of carbon dioxide gas from the cosmetics sprayed from the container, have a high carbon dioxide gas concentration, and can improve the skin after application to a uniformly reddened and bright skin.

[0058] [Table 3]

[0059] [Table 4]

[0060] Test Example 1 The carbon dioxide concentration of the aerosol cosmetics of Example 4 and Comparative Example 1 was measured immediately after spraying and 20 minutes later. The results are shown in Figures 3 and 4.

[0061] (Method for measuring carbon dioxide concentration) As shown in Figure 2, 30 g of purified water was precisely measured and placed in a screw cap, and two drops of 48% KOH aqueous solution were added. The amount of 48% KOH was accurately recorded. Approximately 1.0 g of cosmetic material was precisely measured and sprayed directly into the screw cap from an aerosol container, and then added. The mixture was stirred for five minutes with a stirrer. 2.5 g of 20% citric acid was then precisely measured and added, and the carbon dioxide concentration was immediately measured with an ion concentration meter. The measurement was carried out while the sample aqueous solution was stirred with a stirrer. Using the measurement results of the ion concentration meter, the carbon dioxide concentration contained in the cosmetic was calculated according to the following formula. Carbonate concentration in cosmetic (ppm) = measured value (ppm) × {weight of cosmetic (g) / (weight of cosmetic (g) + weight of water (g) + weight of 48% KOH (g) + weight of 20% citric acid (g)}

[0062] 3 and 4, the carbon dioxide concentration of the cosmetic of Example 4 was higher than that of Comparative Example 1 both immediately after spraying and 20 minutes after spraying.

[0063] Test Example 2 The aerosol cosmetics of Example 4 and Comparative Example 1 were applied to the skin and evaluated for redness and brightness (colorimetric value, visual observation). The results are shown in FIGS.

[0064] (Evaluation method) A cup shaker (3.4 cm in diameter) was attached to the inside of the forearm, and 0.5 g of cosmetic was sprayed directly into it from an aerosol container and applied using a spatula, spreading it as evenly as possible. After application, it was left on for 2 minutes and then wiped off with tissue paper. (i) Colorimetric values; The a and L values ​​of the skin before and after application of the cosmetic were measured using a colorimeter CM2600d (Konica Minolta, Inc.) Measurements were repeated three times on one area, and after the cosmetic was removed, measurements were taken every minute from immediately after removal until five minutes later. The measured a and L values ​​were used to calculate the average values ​​of three measurements, and the difference Δa and ΔL values ​​from before application were calculated.

[0065] (ii) Visual inspection: When measuring the above colorimetric values, the redness and brightness of the skin were visually evaluated according to the following criteria, and the average values ​​of three measurements were calculated. 2;Very red / very bright. 1.5; Between very red and red / between very light and light. 1;Red / Bright. 0.5: Slightly red / slightly bright. 0: Same as before application.

[0066] 5 to 8 show that when applied to the skin, the aerosol cosmetic of Example 4 increases Δa and ΔL more significantly over a long period of time than the aerosol cosmetic of Comparative Example 1, improving the skin to a uniformly reddened and brighter appearance. In particular, the brighter skin can be maintained.

Claims

1. The following components (A), (B), (D), and (G): (A) a water-soluble thickener containing an anionic polymer; (B) base (D) Oil component that is liquid at 25°C, 1 to 10% by mass in the original solution (G) Water wherein component (B) contains at least one selected from potassium hydroxide, sodium hydroxide, potassium monohydrogen phosphate, and sodium monohydrogen phosphate, and component (D) contains a liquid silicone oil, and the concentrate has a pH of 7.1 or more and 10 or less; and (C) Carbon dioxide gas as a propellant An aerosol cosmetic comprising: An aerosol cosmetic in which the pH of the cosmetic 1 minute after spraying is 6 or more and 7.0 or less, and which does not contain any propellant other than carbon dioxide gas, or, if it contains a propellant other than carbon dioxide gas, the content of carbon dioxide gas relative to the total amount of the carbon dioxide gas and the propellant other than carbon dioxide gas is 85 mass% or more.

2. An aerosol cosmetic as described in claim 1, wherein the anionic polymer is an acrylic acid-based polymer.

3. The aerosol cosmetic according to claim 1, wherein the anionic polymer is at least one selected from the group consisting of an acrylic acid / C10-30 alkyl acrylate copolymer and a carboxyvinyl polymer.

4. The aerosol cosmetic preparation according to any one of claims 1 to 3, wherein the component (A) is contained in an amount of 0.1 to 3% by mass in the concentrate.

5. An aerosol cosmetic as described in claim 1, wherein the concentrate further contains (E) a polyhydric alcohol.

6. An aerosol cosmetic according to claim 1, wherein the concentrate further contains (F) a surfactant.

7. 2. The aerosol cosmetic according to claim 1, wherein the component (B) is contained in an amount of 0.1 to 2% by mass in the concentrate.

8. An aerosol cosmetic according to claim 1, wherein component (D) further contains monoester oil.

9. 2. The aerosol cosmetic according to claim 1, wherein the viscosity of the concentrate at 25° C. is 1,000 to 10,000 mPa·s.

10. 2. The aerosol cosmetic according to claim 1, wherein the mass ratio of the concentrate to carbon dioxide gas is 94:6 to 99.5:0.

5.

11. 2. The aerosol cosmetic according to claim 1, which does not contain any propellant other than carbon dioxide gas.

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