JP2009269914A - Foamed skin liniment - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a foamed skin liniment affording sufficient blood circulation enhancing effect by keeping excellent foam even at a low temperature to act carbon dioxide on skin in an aerosol having inner pressure of lower than 0.7 MPa to consider safety. <P>SOLUTION: The foamed skin liniment is a composition containing gas and liquid comprising (A) carbon dioxide, 0.1-3 mass% of (B) a hydrocarbon mixture selected from the group consisting of 3-5C hydrocarbons, the hydrocarbon mixture containing 70-100 mass% of a saturated hydrocarbon having vapor pressure at 35°C of not less than 0.1 MPa and less than 0.5 MPa, and 0.1-25 mass% of (C) a surface active agent, wherein a mass ratio of (A) to (B) is 35:65-95:5, and the composition is filled in a pressure tight case so that the inner pressure thereof is less than 0.70 MPa at 25°C. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a foamy skin coating agent containing carbon dioxide.

  Since carbon circulation is promoted when carbon dioxide (carbon dioxide gas) acts on the skin, various carbon dioxide-containing cosmetics have been proposed. For example, in cosmetics containing carbon dioxide, a method of supplying a saturated carbon dioxide solution at a higher concentration in the presence of ethanol or the like that temporarily supplies saturated carbon dioxide and has higher solubility than water is shown. (Patent Document 1). Furthermore, a method of keeping the jet liquid at a high viscosity to suppress the volatilization of carbon dioxide, a method of coexisting polyhydric alcohol at a high concentration to keep carbon dioxide at a high concentration, and the like are known (Patent Document 2). ~ 3).

  On the other hand, in many aerosol agents, liquefied petroleum gas (LPG) containing propane, isobutane, and normal butane as components is used to form foam. However, liquefied petroleum gas has a problem that it is highly flammable and inferior in foamability at low temperatures. As a technique for solving this problem, for example, by adding carbon dioxide together with an aqueous stock solution containing water and a surfactant, and liquefied petroleum gas, safety against fire is high, and there is a difference in foamability even at low temperatures. Incombustible aerosol foam composition (Patent Document 4), non-flammable aerosol foam by adding compressed gas such as carbon dioxide in addition to 0-4 mass% liquefied gas with respect to 100 mass% of stock solution A product (Patent Document 5) is known. On the other hand, by including a stock solution containing an active ingredient aqueous solution, a normal butane and a propellant consisting of only carbon dioxide gas, the flammability is low, and the low-temperature foaming property is superior to that using liquefied petroleum gas, and high-temperature safety is ensured. A good foamable aerosol composition (Patent Document 6) is known, but normal butane is expensive.

  Furthermore, as an aerosol agent for the purpose of promoting blood circulation using hydrocarbon oil together with carbon dioxide gas, foaming with improved foam persistence by using specific hydrocarbons such as carbon dioxide and isopentane, n-pentane, etc. Although a skin dermal circulation promoter (Patent Document 7) is known, there is no description about the action and effect when the foam pressure at low temperature and the internal pressure of the pressure vessel are lowered.

JP 59-141512 A Japanese Patent Laid-Open No. 11-228334 JP-A-11-171755 JP 2001-72543 A Japanese Patent Laid-Open No. 09-59606 Japanese Patent No. 3587547 JP 2005-2046 A

  An object of the present invention is to provide a foamy skin application that maintains a good foam even at low temperatures while the internal pressure in the container is low and allows carbon dioxide to act on the skin for a long time, thereby obtaining a sufficient blood circulation promoting effect. It is to provide an agent.

  Therefore, the present inventor has made various studies to obtain a coating agent capable of imparting a good blood circulation promoting action by retaining carbon dioxide on the skin for a long time, and the vapor pressure at 35 ° C. is 0.1 MPa or more and less than 0.5 MPa. By containing a hydrocarbon mixture having 3 to 5 carbon atoms mainly composed of saturated hydrocarbons, carbon dioxide can be dissolved at a high concentration, and when discharged onto the skin, a foam containing carbon dioxide at a high concentration Has been found to be retained on the skin for a long time, good foam is formed even at a low temperature, and a foamy skin coating agent having a good blood circulation promoting action is obtained.

That is, the present invention includes the following components (A), (B) and (C),
(A) Carbon dioxide (B) A mixture selected from hydrocarbons having 3 to 5 carbon atoms, and 70 to 100 mass of saturated hydrocarbons having a vapor pressure of 0.1 MPa or more and less than 0.5 MPa at 35 ° C. in the mixture. % Hydrocarbon mixture 0.1 to 3% by mass
(C) Surfactant 0.1-25% by mass
And a composition containing a liquid and a gas having a mass ratio of (A) and (B) of 35:65 to 95: 5 is placed in a pressure vessel so that the internal pressure is less than 0.7 MPa at 25 ° C. The present invention provides a foamy skin coating agent that is encapsulated.

  The foam-like skin coating agent of the present invention has a low internal pressure of less than 0.7 MPa, and when discharged onto the skin, the foam containing carbon dioxide at a high concentration is retained on the skin for a long time, and the foam is removed. By spreading on the skin, an excellent blood circulation promoting effect of the skin can be obtained. Further, since the discharged foam is stable even at a low temperature, massage on the skin can be easily performed.

  The foamy skin coating agent of the present invention is obtained by enclosing a composition containing a liquid and a gas containing the components (A), (B) and (C) in a pressure resistant container.

  Component (A), carbon dioxide, is enclosed in a pressure vessel as a gas and functions not only as a propellant for the foamy skin coating composition of the present invention, but also partly dissolved in the liquid in the pressure vessel. And foam when applied to the skin. On the skin, gaseous carbon dioxide in the foam and carbon dioxide dissolved in the liquid portion have an action of promoting blood circulation in the skin. Therefore, it is preferable that carbon dioxide is present at a high concentration in the liquid in the container. The amount of carbon dioxide dissolved in the liquid in the pressure vessel is 500 to 25,000 ppm, more preferably 1,000 to 20,000 ppm, and particularly 5,000, in that a sufficient effect can be imparted when applied to the skin. It is preferable to set it to -18,000 ppm.

  When the foamy skin coating composition of the present invention is applied to the skin, the hydrocarbon mixture of component (B) has an action of foaming together with carbon dioxide to form a foam containing carbon dioxide at a high concentration. In the hydrocarbon mixture, the pressure inside the pressure vessel of the present invention is maintained at less than 0.7 MPa at 25 ° C., and in order to achieve both good foam quality and blood circulation promoting effect when discharged, the vapor pressure at 35 ° C. It is important that the saturated hydrocarbon of 0.1 MPa or more and less than 0.5 MPa is 70 to 100% by mass, particularly 80 to 100% by mass from the viewpoint of enhancing the effect at the time of use, and further 90 to 100%. It is preferable that it is mass%, especially 95-100 mass%. The saturated hydrocarbon having a vapor pressure at 35 ° C. of 0.1 MPa or more and less than 0.5 MPa includes isobutane having 4 carbon atoms (0.46 MPa), normal butane (0.33 MPa); neopentane having 5 carbon atoms (0.23 MPa). ), Isopentane (0.13 MPa) and the like. Of these, isobutane and normal butane are preferable because foams at low temperatures are good, and it is particularly preferable to use isobutane in combination when using normal butane from the economical aspect. Moreover, as a hydrocarbon of carbon 5, isopentane is preferable.

  Further, in order to dissolve carbon dioxide in the liquid in the pressure vessel, it is preferable to lower the vapor pressure of the hydrocarbon mixture, and it is also preferable to use isopentane in addition to the isobutane having 4 carbon atoms and normal butane. . When isopentane is used in combination, the total composition in the pressure vessel is preferably 0.1 to 1.8% by mass, more preferably 0.1 to 1.2% by mass, especially 0.1 to 0.9% by mass. % Is preferable from the viewpoint of blood circulation promoting effect.

Examples of the saturated hydrocarbon having a vapor pressure at 35 ° C. higher than 0.5 MPa include propane (1.25 MPa). Usually, liquefied petroleum gas (LPG) is a mixture of propane and butane, and circulates as a mixed gas in which these ratios are adjusted according to the purpose. In the present invention, the content of hydrocarbons having a high vapor pressure at 35 ° C. is low in order to obtain a foam that can be kept on the skin for a long time by containing the carbon dioxide at a high concentration in a pressure vessel and under a low pressure. It is preferable. Propane is preferably substantially not blended, but considering industrial availability, normal butane and isobutane: propane (mass ratio) contained in LPG are preferably 70 to 100: 0 to 30, Furthermore, it is preferable that it is 90-99.9: 0.1-10, especially 97-99.5: 0.5-3.
As a preferable form of the hydrocarbon mixture having 3 to 5 carbon atoms, when B1 is a hydrocarbon having 5 carbon atoms, B2 is a hydrocarbon having 4 carbon atoms, and B3 is a hydrocarbon having 3 carbon atoms, B1: B2: B3 (Mass ratio) is a composition of 0 to 75:15 to 100: 0 to 30, a composition of 0 to 75:20 to 99: 0.1 to 3, particularly 0 to 50:49 to 99: 0.5 to 1. A hydrocarbon mixture of the following composition is preferred: The content of B2 is preferably 0.1 to 3% by mass, more preferably 0.1 to 2% by mass, and particularly preferably 0.3 to 1.5% by mass in the entire composition in the pressure vessel.

  In this invention, although content of the said component (B) is 0.1-3 mass% in all the compositions in a pressure-resistant container, when satisfying both the favorable foam and the blood circulation promotion effect, it is 0.2. -2.5 mass% is preferable, and it is especially preferable that it is 0.5-2 mass%.

  In addition, the mass ratio (A: B) of the components (A) and (B) enclosed in the pressure resistant container is 35:65 to 95: 5 in order to satisfy both good foam and blood circulation promoting effect. It is important that it is 38:62 to 95: 5, further 45:55 to 90:10, particularly 50:50 to 85:15 from the viewpoint of blood circulation promoting effect.

  In the present invention, the component (C) surfactant is contained in the liquid, and the component (B) is dispersed or emulsified. When the foamy skin coating composition of the present invention is applied to the skin, the stability of the foam is improved. Improve sexiness. As the surfactant, a nonionic surfactant, an anionic surfactant, a cationic surfactant, an amphoteric surfactant, or the like can be used alone or in appropriate combination of two or more.

  Nonionic surfactants include propylene glycol fatty acid ester, glycerin fatty acid ester, polyoxyethylene glycerin fatty acid ester, sorbitan fatty acid ester, polyoxyethylene sorbitan fatty acid ester, polyoxyethylene sorbitol fatty acid ester, polyethylene glycol fatty acid ester, polyglycerin. Fatty acid ester, sucrose fatty acid ester, pentaerythritol fatty acid ester, polyoxyethylene alkyl ether, polyoxyethylene polyoxypropylene alkyl ether, polyoxyethylene alkylphenyl ether, polyoxyethylene polyoxypropylene glycol, polyoxyethylene castor oil, poly Oxyethylene hydrogenated castor oil, polyoxyethylene alkylamine, polyoxy Ethylene fatty acid amides, alkyl alkanolamide, an alkyl glyceryl ether, alkyl polyglucoside, amino acid esters, modified silicones such as polyether-modified silicone, and alkyl polysaccharides, and the like.

  Anionic surfactants include alkyl sulfates, polyoxyethylene alkyl ether sulfates, polyoxyethylene alkyl ether acetates, N-acyl amino acid salts, alkyl phosphates, polyoxyethylene alkyl ether phosphates, fatty acid salts N-acyl taurine salts, alkyl sulfonates, alkyl sulfoacetates, alkyl sulfosuccinates, polyoxyethylene alkyl sulfosuccinates, and the like.

  Examples of the cationic surfactant include ammonium salts and amine salts such as alkyltrimethylammonium salts, dialkyldimethylammonium salts, alkoxypropyltrimethylammonium salts, and alkylbenzyldimethylammonium salts. By adding these components, in addition to foaming properties, bactericidal action, treatment effect, antistatic effect and the like can be obtained.

  Amphoteric surfactants include alkyldimethylamine oxide, alkyldimethylaminoacetic acid betaine, alkylamidopropylbetaine, alkylsulfobetaine, alkylhydroxysulfobetaine, alkylcarboxymethylhydroxyethylimidazolinium betaine, etc. Can be added if necessary.

  Among these, it is preferable to use one or more selected from nonionic surfactants and anionic surfactants. Nonionic surfactants include glycerin fatty acid ester, polyoxyethylene glycerin fatty acid ester, sorbitan fatty acid ester, polyoxyethylene sorbitan fatty acid ester, polyoxyethylene sorbitol fatty acid ester, polyethylene glycol fatty acid ester, polyglycerin fatty acid ester, sucrose Fatty acid esters, polyoxyethylene alkyl ethers, polyoxyethylene hydrogenated castor oil, polyoxyethylene alkyl amines, polyoxyethylene fatty acid amides, alkyl alkanol amides, alkyl glyceryl ethers, alkyl polyglucosides, amino acid esters and the like are preferred. As the anionic surfactant, polyoxyethylene alkyl ether sulfate, polyoxyethylene alkyl ether acetate, N-acyl amino acid salt, alkyl phosphate, fatty acid salt and the like are preferable. Among these surfactants, those having an alkyl chain having 8 to 16 carbon atoms are preferable from the viewpoint of the stability of foam on the skin.

  These surfactants are preferably used in a large amount from the viewpoint of foam stability and foam feel on the skin. On the other hand, use of a large amount from the viewpoint of irritation to the skin causes problems such as irritation. The range of 0.1 to 25% by mass is preferable in the total amount of all the compositions. In particular, it is preferable to contain 2.0 to 20% by mass, and more preferably 4.0 to 16% by mass in a system for washing away a cleaning agent or a massage agent. Moreover, in the system which remains on the skin as it is, such as milky lotion and lotion, 0.1 to 10% by mass, further 0.2 to 6% by mass, particularly 0.3 to 3% by mass is preferable.

  Carbon dioxide is not converted as carbon dioxide on the alkali side, but becomes carbonate and does not have a blood circulation promoting effect. Accordingly, the pH of the composition is preferably 2.5 to 7, particularly 4.5 to 6.5, from the viewpoint of obtaining an excellent blood circulation promoting effect by dissolving carbon dioxide at a high concentration. As a pH adjuster for adjusting the pH within these ranges, for example, organic acids such as citric acid, malic acid and tartaric acid, or salts thereof, or phosphoric acid or salts thereof can be used.

  In the foamy skin coating agent of the present invention, the viscosity of the liquid sealed in the pressure resistant container holds the carbon dioxide in the foam applied on the skin in order to keep the component (B) dispersed or emulsified stably. In order to satisfy a good blood circulation promoting effect, it is preferably 100 to 500,000 mPa · s, more preferably 200 to 200,000 mPa · s, and particularly preferably 300 to 50,000 mPa · s. In particular, in order to prevent the component (B) from separating in the pressure resistant container and preventing good foam from being obtained, the pressure is preferably set to 100 mPa · s or more. On the other hand, in view of industrially stable production, when the pressure vessel is an aerosol container having a single chamber structure, it is preferably 200 to 2,000 mPa · s, and when it is a double structure aerosol container, It is preferably 2,000 to 30,000 mPa · s. Viscosity modifiers include carboxyvinyl polymer, acrylic acid / alkyl methacrylate copolymer, acrylic acid / alkyl acrylate copolymer, alkyl acrylate copolymer, sodium polyacrylate, polyvinyl alcohol, polyvinyl pyrrolidone, polyethylene glycol , Synthetic polymers such as polymer silicone; cellulose polymers such as methyl cellulose, ethyl cellulose, hydroxyethyl cellulose, hydroxypropyl cellulose, hydroxypropyl methyl cellulose, carboxymethyl cellulose, cationized cellulose, soluble starch, carboxymethyl starch, dextrin fatty acid ester, alginic acid Semi-synthetic polymers such as propylene glycol and hydroxypropylated guar gum; sodium alginate, carragina , Agar, guar gum, quince seed gum, mannan, dextrin, starch, locust bean gum, gum arabic, tragacanth gum, pectin, chitin, chitosan, albumin, casein, collagen, curdlan, xanthan gum, dextran, pullulan, saxino glucan, etc. Examples include natural polymers. Among these, carboxyvinyl polymer, acrylic acid / alkyl methacrylate copolymer, acrylic acid / alkyl acrylate copolymer, alkyl acrylate copolymer in terms of foam formation and foaminess when applied to the skin It is preferable to use 0.01 to 3% by mass of one or more of (meth) acrylic acid polymers such as sodium polyacrylate in the total amount of the composition in the container. Furthermore, the foamy skin coating agent of the present invention uses a (meth) acrylic acid polymer and other viscosity-adjusting polymer for viscosity adjustment in order to retain high-concentration carbon dioxide in the foam on the skin. It is preferable to do. The total amount of the viscosity modifier containing these (meth) acrylic acid polymers is preferably 0.02 to 5% by mass.

  The foamy skin coating composition of the present invention can further contain water, alcohols, oils, moisturizers, fragrances, plant extracts, bactericides / preservatives, chelating agents and the like.

  The foamy skin coating agent of the present invention is produced by enclosing the components (A), (B), (C) and other components in a pressure resistant container. For example, after the liquid containing the component (C) is filled in the pressure vessel, the component (A) carbon dioxide and the component (B) hydrocarbon mixture are sealed. At this time, it is also possible to fill with other injection gas as needed.

  The pressure vessel only needs to be in a form that allows the content liquid to be discharged in the form of a foam, for example, a normal single-chamber can such as aluminum or tin can be used, and the container material is an acetal resin, A synthetic resin container such as a polycarbonate-based resin, glass, or the like can be used as long as it is within the pressure limit. In particular, when high-pressure carbon dioxide is sealed once industrially, an impact can having an aluminum container thickness adjusted is preferable. Further, depending on the viscosity of the stock solution, a double container having an inner bag in a pressure resistant container can be used. In the case of a double container, the aerosol composition of the present invention is filled in the inner bag, and the injection gas is filled separately between the pressure-resistant container and the inner bag. This propellant gas can be used as long as it is a gas generally used in aerosol.

  The pressure in the pressure vessel is less than 0.7 MPa at 25 ° C., but 0.4 MPa or more and less than 0.7 MPa, further 0.45 MPa or more and less than 0.7 MPa, particularly 0.5 to 0 from the point of obtaining good foam. It is preferably .65 MPa.

  The foamy skin coating agent of the present invention is preferably used by applying on the skin and spreading the foam generated on the skin. Here, as an application means on the skin, it may be directly discharged onto the desired skin to form bubbles on the spot, but it is discharged onto the hand to form bubbles, and the bubbles are formed on the desired skin. You may apply to. The foam formed by the foamy coating composition of the present invention is stable for a long time, and is stable even after performing an operation to spread on the skin, a light massage, etc., so high concentration carbon dioxide acts on the skin for a long time. Excellent blood circulation promoting effect.

  Therefore, the foamy skin coating agent of the present invention can be used as a cosmetic or a skin external preparation, and is a skin cleanser, hair cleanser, makeup remover, massage agent, pack / mask agent, cream / milky lotion / skin lotion / gel / Skin care agents such as beauty serums, hair conditioning agents, makeup agents, aromatic cosmetics, deodorant agents, depigmenting agents, hair removal / hair removal agents, hair restoration / hair growth agents, and coating / cleaning agents for prevention and treatment of wounds, etc. It can be used as a wiping agent, a coating agent / wiping agent for prevention and treatment of swelling and edema. Depending on these applications, those active ingredients can be blended. For example, for cosmetics (including cleaning agents), in addition to the moisturizing agent, sunscreen agents (UV-A and / or UV-B absorbers / reflectors), whitening agents, slimming agents, deodorants, Various synthetic vitamins as natural antiperspirants, astringents, refreshing agents, wrinkle / dullness inhibitors, natural vitamins and derivatives thereof, amino acids and derivatives thereof can be used. Various active blood flow promoters, plant extracts, and the like can be used as active ingredients for hair nourishing and hair restoration. As a massage agent or a wiping agent, various anti-inflammatory agents, local anesthetics, anti-inflammatory analgesics, antihistamines, bactericides, and the like can be added.

Examples 1-8 and Comparative Examples 1-4
According to the formulation shown in Table 1, after mixing other than A and B to prepare a stock solution (liquid component) and filling a pressure vessel, it is sealed in the order of hydrocarbon mixture (B) and carbon dioxide (A) to form an aerosol composition. I got a thing. After the obtained aerosol composition was stored at 25 ° C. for 1 week, foam stability and skin blood flow were evaluated. At this time, pH was less than 7 in all the compositions. The viscosity was measured using a BM viscometer (Toki Sangyo Co., Ltd.) at a measurement temperature of 25 ° C. 2, 30 r / min, can be measured under measurement conditions of 1 minute.

(Measuring method)
(1) Carbon dioxide concentration Bubbles were jetted under an atmosphere of 25 ° C., and the carbon dioxide concentration was measured. As a carbon dioxide measuring device, a carbon dioxide electrode model 9502BN manufactured by Orion was used.
(2) Foam stability The foam was sprayed onto the skin so as to have a diameter of 3 cm and held for 2 minutes for evaluation.
○: Bubbles are formed and held for 2 minutes. Δ: Bubbles are formed, but they are spilled. ×: Bubbles are not formed. (3) Skin blood flow Bubbles are jetted to the forearm at 3 cmφ and held for 2 minutes. The foam was wiped off and the skin condition (skin flush) was visually observed.
◎: Flushing is clearly recognized ○: Flushing is recognized △: Flushing is slightly recognized ×: Flushing is not recognized

As a result, in Examples 1 to 8 of the present invention, carbon dioxide was dissolved at a high concentration, the foam stability at 25 ° C. was good, and flushing of the skin was observed. Regarding skin blood flow, in the same manner as in (3), after spraying foam on the forearm and wiping, 5 seconds later, using a real-time blood flow imaging device FLPI (Moor Instruments, moorFLPI), the skin tissue blood flow rate is measured. When measured and compared with the blood flow rate at rest without application, blood flow was increased in those with skin flushing.
In Table 1, when the ratio of the component (A) was 30% by mass or less (Comparative Example 1), no skin flushing was observed, and almost no blood flow promoting action was observed. Further, when the ratio of the component (A) is 100% by mass, that is, when the component (B) is not contained (Comparative Example 2), skin flushing is clearly recognized and the blood flow promoting action is remarkably increased, but the bubbles are dripped. The foam stability was poor. Furthermore, when a hydrocarbon mixture (Comparative Example 3) in which the proportion of saturated hydrocarbons having a vapor pressure of 0.1 MPa or more and less than 0.5 MPa at 35 ° C. contained in the component (B) is less than 70% by mass is used, the internal pressure is 0. .7 MPa has been exceeded. Moreover, since the composition liquid of the comparative example 4 with a low viscosity isolate | separated, it did not evaluate.

Examples 9 to 14 and Comparative Example 5
According to the formulation shown in Table 2, ingredients other than A and B were mixed to prepare a stock solution, and the stock solution, carbon dioxide and hydrocarbon mixed gas were sealed in a pressure resistant container to obtain an aerosol composition. After the obtained aerosol composition was stored at 25 ° C. for 1 week, foam stability and skin blood flow were evaluated. At this time, pH was less than 7 in all the compositions.

  As a result, in Examples 9 to 14 of the present invention, carbon dioxide was dissolved at a high concentration, the foam stability at 25 ° C. was good, and flushing of the skin was observed. In Comparative Example 5 in which only isopentane was used as the component (B), bubbles at low temperatures (5 ° C.) were prone to dripping.

Examples 15 and 16
The foam-like moisturizing liquid (Example 15) and the foam-like cosmetic liquid (Example 16) shown in Table 3 were prepared and stored at 25 ° C. for 1 week, and the foam stability and skin blood flow were evaluated. At this time, pH was less than 7 in all the compositions. In both cases, the foam stability was good, and the effect of promoting skin blood flow was also observed.

Claims (10)

The following components (A), (B) and (C),
(A) Carbon dioxide (B) A mixture selected from hydrocarbons having 3 to 5 carbon atoms, and 70 to 100 mass of saturated hydrocarbons having a vapor pressure of 0.1 MPa or more and less than 0.5 MPa at 35 ° C. in the mixture. % Hydrocarbon mixture 0.1 to 3% by mass
(C) Surfactant 0.1-25% by mass
And a composition containing a liquid and a gas having a mass ratio of (A) and (B) of 35:65 to 95: 5 is placed in a pressure vessel so that the internal pressure is less than 0.7 MPa at 25 ° C. A foamy skin application agent.   The foamy skin coating composition according to claim 1, wherein the amount of carbon dioxide dissolved in the liquid in the pressure vessel is 500 to 25,000 ppm.   (B) The foamy skin coating composition according to claim 1 or 2, wherein the hydrocarbon mixture contains normal butane having 4 carbon atoms and isobutane.   (B) The hydrocarbon mixture includes hydrocarbons having 4 and 5 carbon atoms, and the hydrocarbon content of 5 carbon atoms is 0.1 to 1.8% by mass in the composition in the pressure vessel. The foamy skin coating agent according to claim 1 or 2.   The foamy skin coating composition according to any one of claims 1 to 4, wherein the liquid in the composition has a pH of 2.5 to 7.   The foamy skin coating composition according to any one of claims 1 to 5, wherein the viscosity of the liquid in the pressure vessel is 100 to 500,000 mPa · s.   The foam-type skin coating agent according to any one of claims 1 to 6, wherein the pressure-resistant container is an aerosol container having a single-chamber structure.   The foamy skin coating agent according to any one of claims 1 to 6, wherein the pressure-resistant container is an aerosol container having a double structure.   The foamy skin application agent according to any one of claims 1 to 8, which is for promoting blood circulation of the skin by spreading the foam formed by spraying from the pressure vessel on the skin.   The foamy skin coating composition according to any one of claims 1 to 8, which is for massaging the skin by spreading foam formed by spraying from the pressure vessel on the skin.