JP2003252725A - Foamable aerosol composition - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To obtain a foamable aerosol composition which does not require shaking of a container before discharge, is dischargeable in a placed state on a basin and forms stable foams regardless of temperature change. <P>SOLUTION: The aerosol composition comprises a fatty acid, an alkali agent, liquefied gas and compressed gas. When the aerosol composition is discharged, a part or the whole of the fatty acid is made into a fatty acid salt with the alkali agent. The aerosol composition contains a higher alcohol. The content of the liquefied gas is preferably 0.1-10 wt.% in the aerosol composition. The compressed gas is preferably carbon dioxide gas and/or nitrous oxide. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION This invention relates to foamable aerosol compositions. More specifically, it relates to a foamable aerosol composition that does not require shaking of the product before ejection and forms stable foam.

[0002]

2. Description of the Related Art A conventional general foamable aerosol composition comprises 0.5 to 5% by weight of a surfactant, 70 to 95% by weight of water, 0 to 20% by weight of a lower alcohol, and 0.1 to 0.1% of an active ingredient.
It is composed of 80 to 97% by weight of an aqueous stock solution of 10% by weight and 3 to 20% by weight of a liquefied gas containing liquefied petroleum gas as a main component, and the aqueous stock solution and the liquefied gas are separated into two phases inside an aerosol container. ing. Therefore, in order to discharge a uniform composition, it was necessary to grasp the container before discharging and to shake the container up and down. Therefore, it cannot be fixed on a washbasin or vanity, or left standing, and if the container is large or heavy, it is not convenient for people with small hands or people with weak grip strength. There are cases.

Therefore, various uniform foamable aerosol compositions in which a liquefied gas is solubilized in an aqueous stock solution have been developed. For example, C1-C6 alkyl ether (dimethyl ether) and C3-C6 hydrocarbons (propane, butane)
A transparent single-phase cosmetic composition containing a mixed propellant, a surfactant, and a coupling agent (Japanese Patent No. 28624).
91) or an atomizing gas and an aqueous composition containing a mixture of surfactants selected from nonionic surfactants and amphoteric surfactants, and a single-phase transparent composition (Japanese Patent No. 2988730). No.), an aerosol composition in which an aqueous stock solution consisting of a higher alcohol, a surfactant, ethanol, and water and a propellant containing liquefied petroleum gas are formed, and the aqueous stock solution and the propellant form a uniform liquid phase. Thing (JP-A-9
No. 143039).

On the other hand, an effervescent aerosol composition which is homogeneous by mixing an aqueous stock solution containing a fatty acid and a specific alkaline agent together with a liquefied gas has been disclosed (Japanese Patent Publication No. 6-84).
497).

However, in any of the above-mentioned methods, in order to make the composition uniform, the amount of propellant acting as a foaming agent can be as small as 10% or less, so that the foamability at low temperature becomes low, especially foaming. There was a problem that the retention property was low, and bubbles were defoamed and liquefied before spreading on hair or skin.

[0006]

DISCLOSURE OF THE INVENTION The present invention has been made in view of the above prior art, and it is not necessary to shake the container before discharging, and discharging can be performed in a state of being placed on a washbasin, Further, it is an object of the present invention to provide a foamable aerosol composition which forms stable bubbles even at a low temperature regardless of a temperature change even if the amount of the foaming agent is small.

[0007]

The present invention is an aerosol composition containing a fatty acid, an alkaline agent, a liquefied gas and a compressed gas, wherein when the aerosol composition is discharged, a part or all of the fatty acid is an alkaline agent. To a fatty acid salt.

It is preferred that the aerosol composition contains a higher alcohol.

The content of the liquefied gas is preferably 0.1 to 10% by weight in the aerosol composition.

It is preferable that the compressed gas is carbon dioxide gas and / or nitrous oxide.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION The foamable aerosol composition of the present invention is an aerosol composition containing a fatty acid, an alkaline agent, a liquefied gas and a compressed gas.

Since the compressed gas is dissolved in the liquid phase portion (liquid component) of the aerosol composition in the aerosol container,
When the aerosol composition is discharged, the dissolved compressed gas is vaporized from the discharged product, and the pH of the discharged product changes. As a result, a part or all of the fatty acid in the discharged product becomes a fatty acid salt, and the foamability of the discharged product is improved regardless of the temperature during use.

In the case of a conventional composition containing a fatty acid and an alkaline agent, almost all of the fatty acid exists in the form of a fatty acid salt in the composition, and even if the composition is discharged, the fatty acid and the fatty acid salt do not change. No, the foaming state was susceptible to the temperature during use, the aerosol composition of the present invention,
By changing the fatty acid to a fatty acid salt after discharge, it is less affected by the temperature during use, and the blending amount of the foaming agent is at least
The extrudate exhibits excellent foaming properties.

The aerosol composition of the present invention comprises an aqueous stock solution containing a fatty acid and an alkaline agent, a liquefied gas, and a compressed gas, and a part of the compressed gas is dissolved in the liquid phase part of the aqueous stock solution and the liquefied gas. is doing. It is preferable that the liquid phase portion is uniform, and in this case, an operation such as shaking the container before discharging is unnecessary, and a uniform aerosol composition can be discharged even when the container is placed or fixed.

In the aqueous stock solution, the fatty acid is partially or wholly in the form of a fatty acid salt due to the alkaline agent. However, when the aqueous stock solution is made into an aerosol composition together with a liquefied gas and a compressed gas, a part of the compressed gas is generated. Dissolves in the liquid phase part of the aerosol composition. As a result, the pH of the liquid phase portion changes to the acidic side, and part or all of the fatty acid salt becomes fatty acid. The fatty acid increases the viscosity of the liquid phase part to some extent as compared with the aqueous undiluted solution, and also has the effect of suppressing the separation of the liquid phase part. Therefore, a fatty acid salt and a fatty acid may be present in the aerosol composition, or only a fatty acid may be present in the aerosol composition. When the aerosol composition is discharged, the compressed gas dissolved in the liquid phase part is vaporized and the pH of the discharged product changes to the alkaline side, so that the fatty acid in the discharged product becomes a fatty acid salt and improves the foamability. .

Examples of the fatty acid include capric acid, lauric acid, myristic acid, palmitic acid, stearic acid, isostearic acid, 12-hydroxystearic acid, behenic acid, oleic acid, linoleic acid, linoleic acid, and the like. -22 fatty acids can be mentioned.
Among these, it is difficult to separate even when the aerosol composition is stored for a long period of time by appropriately increasing the viscosity of the liquid phase part,
At the normal temperature (20 to
It is preferable to use a solid substance at 30 ° C. In addition,
Fatty acids that are liquid at room temperature, such as isostearic acid and oleic acid, may be used together as a viscosity modifier.

The content of the fatty acid is 0.1 in the aqueous stock solution.
It is preferably -20% by weight, more preferably 0.3-10% by weight. When the content of the fatty acid is less than 0.1% by weight, it tends to be difficult to obtain a discharge product having excellent foamability, and when it exceeds 20% by weight, it is in the aqueous stock solution and further in the liquid phase part. Therefore, it tends to precipitate, and it tends to be difficult to uniformly contain the same.

The alkaline agent reacts with the fatty acid,
Used to make fatty acid salts. As the alkaline agent, sodium hydroxide, potassium hydroxide, ammonium hydroxide, monoethanolamine, diethanolamine,
Examples include triethanolamine, aminomethyl propanol, aminomethyl propanediol and the like.

The content of the alkaline agent in the aqueous stock solution is preferably 0.01 to 10% by weight, more preferably 0.05 to 5% by weight. The content of the alkaline agent is 0.0
If it is less than 1% by weight, the amount of fatty acid salt formed during ejection tends to be too small, and the effect of improving foamability tends to be difficult to obtain. On the other hand, when the content of the alkaline agent exceeds 10% by weight, the aqueous undiluted solution becomes strongly alkaline, the hair and the skin are strongly irritated, and the aerosol container tends to be corrosive.

The content ratio of the fatty acid and the alkali agent is 30 to 30 when expressed in mol% of the alkali agent with respect to the fatty acid.
The amount is preferably 110 mol%, more preferably 35 to 105 mol%. When the mol% of the alkaline agent with respect to the fatty acid is less than 30 mol%, the amount of the fatty acid salt formed is small and the effect of improving the foamability is small. Further, the fatty acid tends to be difficult to dissolve in the aqueous stock solution or the liquid phase part of the aerosol composition, and when it exceeds 110 mol%, the aqueous stock solution becomes strongly alkaline and has strong irritation to hair and skin, Corrosion to aerosol containers tends to be stronger. Further, by adjusting the content ratio of the alkaline agent to the fatty acid, it is possible to change the viscosity of the liquid phase portion of the aqueous stock solution or the aerosol composition, and to stabilize the aerosol composition even when stored for a long period of time. Can be kept in a state.

In the present invention, the fatty acid and the alkaline agent are contained in the aqueous stock solution in the above content ratio, but when the compressed gas is dissolved, the pH of the liquid phase part changes (decreases) to the acidic side. In some cases, a part or all of the fatty acid salt becomes a fatty acid in the liquid phase portion, and the fatty acid may be precipitated due to a temperature change during production or storage of the aerosol composition. In this case, it is preferable to contain a higher alcohol in the aqueous stock solution in order to solubilize the fatty acid and stabilize the fatty acid in the liquid phase part of the aqueous stock solution or the aerosol composition.

Examples of the higher alcohols include lauryl alcohol, cetyl alcohol (cetanol),
Examples thereof include straight-chain alcohols such as stearyl alcohol, behenyl alcohol, myristyl alcohol and oleyl alcohol, and branched chain alcohols such as monostearyl glycerin ether, lanolin alcohol, hexyldecanol, isostearyl alcohol and octyldodecanol. Among these, lauryl alcohol, myristyl alcohol, and cetyl alcohol having a relatively small number of carbon atoms are preferable in order to efficiently disperse the fatty acid precipitated with the decrease in pH without raising the viscosity too much.

The content of the higher alcohol is preferably 0.1 to 20% by weight, more preferably 0.3 to 10% by weight in the aqueous stock solution. When the content of the higher alcohol is less than 0.1% by weight, it is difficult to obtain the effect of containing the higher alcohol, and the fatty acid tends to precipitate. On the other hand, the content of the higher alcohol is 20% by weight.
If it exceeds, the higher alcohol itself is difficult to dissolve and tends to be non-uniform.

Further, in the aqueous stock solution used in the foamable aerosol composition of the present invention, in order to solubilize oil-soluble components such as liquefied gas and oil component described later in the aqueous stock solution to form a uniform liquid phase part. Further, in order to improve foamability, it is preferable to further contain a surfactant as an active ingredient when used as a detergent such as a cleansing agent.

Examples of the above-mentioned surfactants include nonionic surfactants, anionic surfactants, amphoteric surfactants, polymer surfactants, silicone surfactants, natural surfactants and the like. Among them, they can be used alone or in combination of two or more kinds as appropriate.

Examples of the nonionic surfactants include sorbitan fatty acid esters, glycerin fatty acid esters, polyglycerin fatty acid esters such as di, tri, tetra, and deca, polyoxyethylene sorbitan fatty acid esters, and polyoxyethylene. Solbit fatty acid esters, polyoxyethylene glycerin fatty acid esters, polyethylene glycol fatty acid esters, polyoxyethylene alkyl ethers, polyoxyethylene polyoxypropylene alkyl ethers, polyoxyethylene alkyl phenyl ethers, polyoxyethylene castor oil Fatty acid alkylol such as hydrogenated castor oil, polyoxyethylene castor oil derivative, polyoxyethylene alkylamine / fatty acid amide, coconut oil fatty acid diethanol Bromide, decyl glucoside, alkyl glucosides, such as lauryl glucoside, and the like.

Examples of the anionic surfactant include alkyl sulfate, polyoxyethylene alkyl ether sulfate, alkyl phosphate, polyoxyethylene alkyl ether phosphate, higher alkyl sulfate ester salt, alkyl ether sulfate ester. Examples thereof include salts, phosphoric acid ester salts, alkylbenzene sulfonates, α-olefin sulfonates, higher fatty acid ester sulfonates and higher fatty acid alkylolamide sulfate ester salts.

Examples of the amphoteric surfactant include betaine acetate and lecithin.

Examples of the polymeric surfactant include sodium alginate and tragacanth gum.

As the silicone type surfactant, polyoxyethylene-methylpolysiloxane copolymer, polyoxypropylene-methylpolysiloxane copolymer,
Examples thereof include poly (oxyethylene-oxypropylene) -methyl polysiloxane copolymer.

Examples of the natural surfactant include surfactin sodium, cyclodextrin, lecithin, saponin, soybean phospholipid, soybean lysophospholipid solution and the like.

The content of the surfactant is not particularly limited, but in order to solubilize the oil-soluble components such as liquefied gas in the aqueous stock solution to obtain a uniform liquid phase portion, it is usually 0.
It is preferably 1 to 20% by weight, more preferably 0.5 to 15% by weight. When the aerosol composition of the present invention is used as a cleansing agent such as a face wash and a cleansing agent and contains it as an active ingredient, it should be contained in an aqueous undiluted solution to obtain a sufficient cleaning effect.
˜50 wt%, and more preferably 3 to 40 wt%.

Further, the aqueous undiluted solution used in the aerosol composition of the present invention contains an active ingredient, a lower alcohol, a polyhydric alcohol, an oil component, a water-soluble polymer, a powder or the like depending on the purpose and application of the product. It can also be contained.

As the active ingredient, diethoxyethyl succinate, a cleaning ingredient such as limonene, propylene glycol, glycerin, 1,3-butylene glycol, collagen, xylitol, sorbitol, hyaluronic acid,
Moisturizers such as caronic acid, sodium lactate, dl-pyrrolidone carboxylate, keratin, casein, lecithin, urea, paraoxybenzoic acid ester, sodium benzoate, phenoxyethanol, benzalkonium chloride, chlorhexidine chloride, parachlormethacresol, etc. Sterilizer / preservative, alkylaminoethyl (meth) acrylate- (meth) acrylic acid alkyl ester copolymer,
Octylamide acrylate-hydroxypropyl acrylate-butylaminoethyl methacrylate copolymer, vinylpyrrolidone-vinyl acetate copolymer, hydroxyethyl acrylate-butyl acrylate-methoxyethyl acrylate copolymer, alkanolamine acrylate, Hair styling agents such as alkyl acrylate copolymer emulsion, alkyl acrylate-styrene copolymer emulsion, N-methacryloylethyl N, N-dimethylammonium-α-methylcarboxybetaine-methacrylic acid alkyl ester copolymer, polyurethane UV rays of paraaminobenzoic acid, paraaminobenzoic acid monoglycerin ester, octyl salicylate, phenyl salicylate, isopropyl paramethoxycinnamate, octyl paramethoxycinnamate, etc. Astringent, glycine, alanine, leucine, serine, tryptophan, cystine, cysteine, methionine, amino acids such as aspartic acid, glutamic acid, arginine, vitamin A oil, retinol, retinol palmitate, pyridoxine hydrochloride, benzyl nicotinate, nicotinamide, Nicotinate dl-α-tocopherol, vitamin D2 (ergocasiferol), dl-α-tocopherol, dl-α-tocopherol acetate, pantothenic acid, vitamins such as biotin, elastradiol, ethinyl estradiol, and other hormones, ascorbine Antioxidants such as acid, α-tocopherol, dibutylhydroxytoluene, butylhydroxyanisole, peony extract, loofah extract, rose extract, lemon extract, aloe extract, Various extracts such as root extract, eucalyptus extract, sage extract, tea extract, seaweed extract, placenta extract, silk extract, lauryl methacrylate, geranyl chloride, acetophenone myristate, benzyl acetate, benzyl propionate, methyl benzoate, Deodorant / deodorant such as methyl phenylacetate, antipruritic such as crotamiton, d-camphor, 1-menthol, anti-inflammatory analgesic such as methyl salicylate, camphor, indomethacin, piroxicam, felbinac, ketoprofen, l-menthol, camphor, etc. Astringent such as zinc oxide, allantoin hydroxyaluminum, tannic acid, citric acid, lactic acid, anti-inflammatory agent such as allantoin, dipotassium glycyrrhizinate, glycyrrhetinic acid, azulene,
Local anesthetics such as dibucaine hydrochloride, tetracaine hydrochloride, lidocaine hydrochloride, antihistamines such as diphenhydramine hydrochloride, diphenhydramine, chlorfemilamin maleate, whitening agents such as arbutin and kojic acid, N, N
Examples thereof include pest repellents such as diethyl-m-toluamide (diet), caprylic acid diethylamide, and dimethyl phthalate.

The content of the active ingredient is 0.
It is preferably from 0.1 to 20% by weight, more preferably from 0.1 to 15% by weight. When the content of the active ingredient is less than 0.01% by weight, the effect of the active ingredient tends not to be sufficiently obtained, and when it exceeds 20% by weight, the concentration of the active ingredient becomes too high and the human body may be affected depending on the active ingredient. There may be adverse effects such as increased irritation to.

The lower alcohol is used as a solubilizing agent, an antifreezing agent, a viscosity adjusting agent, a part of a solvent of the active ingredient, or the purpose of adjusting the amount of compressed gas dissolved or adjusting the foamability. Used in. The lower alcohol has a carbon number of 2 such as ethanol, propanol, isopropanol, butanol, and amyl alcohol.
There are 5 monohydric alcohols.

When the lower alcohol is used, the content thereof is preferably 1 to 30% by weight, more preferably 3 to 20% by weight in the aqueous stock solution. If the content of the lower alcohol is less than 1% by weight, the effect of containing the lower alcohol tends to be difficult to obtain, and if it exceeds 30% by weight, the liquefied gas is likely to be completely dissolved and uniform.
Foamability tends to deteriorate.

The polyhydric alcohol is used as a solubilizer, an antifreezing agent, a viscosity modifier, a moisturizer, a part of a solvent of the active ingredient, or for the purpose of adjusting foamability. As the polyhydric alcohol, ethylene glycol, propylene glycol, 1,3-butylene glycol, glycerin, trimethylolpropane, pentaerythril, xylitol, sorbitol, mannitol, diethylene glycol, dipropylene glycol, diglycerin, triethylene glycol, Examples thereof include triglycerin, polyethylene glycol and polypropylene glycol.

When the polyhydric alcohol is used, its content in the aqueous stock solution is preferably 1 to 30% by weight, more preferably 3 to 20% by weight. When the content of the polyhydric alcohol is less than 1% by weight, the effect of containing the polyhydric alcohol tends to be difficult to obtain, and when it exceeds 30% by weight, the foamability is deteriorated or the drying property is deteriorated. There is a tendency for the usability to decrease, such as an increase in stickiness.

The oil component is used for the purpose of improving the feeling of use, and examples of the oil component include normal pentane, isopentane, normal hexane, isohexane, kerosene, liquid paraffin, squalene, squalane, petrolatum, paraffin and isoparaffin. Hydrocarbons; isopropyl myristate, cetyl octanoate,
Octyldodecyl myristate, isopropyl palmitate, butyl stearate, myristyl myristate,
Ester oils such as decyl oleate, cetyl lactate, isocetyl stearate, ethyl acetate, butyl acetate, cetostearyl alcohol, diisobutyl adipate, diisopropyl sebacate, diethoxyethyl succinate; methyl polysiloxane, octamethyl trisiloxane, decamethyl Silicone such as tetrasiloxane, octamethylcyclotetrasiloxane, decamethylcyclopentasiloxane, methylphenylpolysiloxane; avocado oil, camellia oil, corn oil, mink oil, olive oil, rapeseed oil, sesame oil, castor oil, linseed oil, safflower Oils, jojoba oil, germ oil, coconut oil, balm oil, hydrogenated castor oil and other oils and fats; beeswax, lanolin, lanolin acetate,
Waxes such as candelilla wax, kauna burrow, mokuro, whale wax, and montan wax are given.

When the oil component is used, its content is preferably 0.1 to 15% by weight, and more preferably 0.5 to 10% by weight in the aqueous stock solution. The content of the oil component is 0.1
If it is less than 15% by weight, the effect of containing the oil component tends to be difficult to obtain, and if it exceeds 15% by weight, the liquid phase portion tends to be easily separated.

The water-soluble polymer adjusts the viscosity of the aqueous stock solution or the liquid phase portion so as to prevent the oil-soluble components such as liquefied gas and oil components from separating from the aqueous stock solution, and further the hardness of the discharged product and It is used for adjusting foam quality such as drying property.

Examples of the water-soluble polymer include collagen hydrolyzate, cationized hydrolyzed collagen, coconut oil fatty acid hydrolyzed collagen, keratin, keratin hydrolyzate, cationized hydrolyzed keratin, casein, casein hydrolyzate, gelatin. , Gelatin hydrolyzate, glucagon, dextrin, pectin, starch, sodium alginate, methyl cellulose, ethyl cellulose, hydroxyethyl cellulose, hydroxypropyl cellulose, nittle cellulose, crystalline cellulose, xanthan gum, modified potato starch, polyvinyl alcohol, polyvinylpyrrolidone, carboxyvinyl polymer, etc. Can be given.

When the water-soluble polymer is used, its content is preferably 0.05 to 10% by weight, more preferably 0.1 to 5% by weight. The content of the water-soluble polymer is 0.0
If it is less than 5% by weight, the thickening effect tends to be difficult to obtain, while if it exceeds 10% by weight, the viscosity tends to be too high and it tends to be difficult to handle.

The powder itself is used as a carrier, a protective agent, an adhesive, a solid lubricant or the like which acts as an active ingredient by itself or which carries other active ingredients. As the powder, talc, zinc oxide, kaolin, mica, magnesium carbonate, calcium carbonate, zinc silicate, magnesium silicate, aluminum silicate, calcium silicate, silica,
Mica, zeolite, ceramic powder, boron nitride, etc. can be mentioned.

When the powder is used, the content is 0.1 to
It is preferably 10% by weight, more preferably 0.5 to 5% by weight. If the content of the powder is less than 0.1% by weight, the effect of containing the powder tends to be difficult to obtain, while if it exceeds 10% by weight, the powder may agglomerate in the aerosol composition, It tends to be clogged with valves and discharge members.

The aqueous undiluted solution used in the present invention may be prepared by dissolving or dispersing the fatty acid, the alkaline agent, the higher alcohol, the surfactant, the active ingredient and the like in a solvent such as water or an aqueous alcohol solution. it can. Examples of the aqueous alcohol solution include a mixture of water and a lower alcohol, a mixture of water and a polyhydric alcohol, and the like.

As the water, purified water, ion-exchanged water,
Examples include physiological saline, which are usually used for cosmetics and pharmaceuticals.

The pH of the thus obtained aqueous stock solution at 20 ° C. is preferably 6.0 to 9.0, and more preferably 6.5 to 8.5. When the pH of the aqueous stock solution is less than 6.0, a large amount of fatty acid exists, so in the aqueous stock solution,
Furthermore, when an aerosol composition is prepared, fatty acids tend to precipitate. On the other hand, the pH of the aqueous stock solution is 9.0.
When it exceeds, the hair and skin are strongly irritated and the aerosol container tends to be corrosive.

The foamable aerosol composition of the present invention comprises the above-mentioned aqueous stock solution, a liquefied gas and a compressed gas.

It is preferable that the liquefied gas is solubilized in the aqueous stock solution to form a uniform liquid phase portion. As a foaming agent that forms bubbles with the aqueous stock solution as a liquid film when the aerosol composition is discharged. To work. The solubilization in the present invention does not mean complete dissolution such that ethanol is dissolved in water, but means that the liquefied gas is dispersed in the aqueous undiluted solution in a very fine size to maintain uniformity. .

Examples of the liquefied gas include propane, n-butane, isobutane and mixtures thereof, liquefied petroleum gas (LPG) and dimethyl ether (DM).
E), or a mixture of liquefied petroleum gas and dimethyl ether, and the like, and it is preferable to use a liquefied gas containing liquefied petroleum gas as a main component from the viewpoint of foamability. Further, in order to adjust the foaming state, hydrocarbons having 5 to 6 carbon atoms such as n-pentane, isopentane, n-hexane or isohexane may be mixed with the liquefied gas.

The content of the liquefied gas in the aerosol composition is preferably 0.1 to 10% by weight, more preferably 0.5 to 8% by weight. When the content of the liquefied gas is less than 0.1% by weight, foaming becomes small and it becomes difficult to spread the coating, and the usability tends to deteriorate. If the content of the liquefied gas exceeds 10% by weight, it tends to be difficult to solubilize in the aqueous undiluted solution, and it tends to be difficult to obtain a uniform liquid phase part.

A part of the compressed gas is dissolved in the liquid phase part,
A part or all of the fatty acid salt in the liquid phase part is used as a fatty acid to increase the viscosity of the liquid phase part and improve the stability of the liquid phase part. In addition, the compressed gas dissolved in the liquid phase portion has the effect of changing the pH of the discharge product when the aerosol composition is discharged, thereby converting the fatty acid into a fatty acid salt. Further, it also has an effect as a foaming auxiliary agent for improving foamability. Further, the compressed gas that has not dissolved in the liquid phase portion acts as a pressurizing agent in the gas phase portion, and has the effect of reducing the pressure change due to temperature change.

Examples of the compressed gas include carbon dioxide gas, nitrous oxide, nitrogen gas, compressed air, oxygen gas and the like.
Of these, carbon dioxide gas, nitrous oxide, or a mixture thereof is preferably used because of its excellent solubility in the liquid phase portion. In particular, it is preferable to use carbon dioxide gas because it easily becomes acidic when dissolved in the liquid phase portion.

The content of the compressed gas is 0.01 to 10% by weight, more preferably 0.1 to 5% by weight in the aerosol composition.
Is preferred. Content of the compressed gas is 0.0
When the amount is less than 1% by weight, the amount dissolved in the liquid phase portion becomes small, the pH change of the discharged product when discharged is small, and the amount of the fatty acid salt formed becomes small, and it is difficult to obtain the effect of improving the foamability. Tend. On the other hand, when the content of the compressed gas exceeds 10% by weight, the saturated dissolution amount in the liquid phase portion is greatly exceeded, and the product pressure of the aerosol product tends to be too high.

The pH at 20 ° C. in the liquid phase portion of the aerosol composition in which the compressed gas is dissolved in the mixture of the above-mentioned aqueous stock solution and the liquefied gas is 3.0 to 7.0, further 3.5 to 6.8.
Is preferred. When the pH of the liquid phase portion is less than 3.0, the aerosol container filled with the aerosol composition tends to be corroded. On the other hand, when the pH exceeds 7.0, the amount of the compressed gas dissolved is small, so that the pH fluctuation of the discharged product when discharged is small, the amount of the fatty acid salt formed is small, and the effect of improving the foamability is improved. Tends to be difficult to obtain.

When the above aerosol composition is discharged, the pH of the discharged product at 20 ° C. is preferably 6.0 to 9.0, more preferably 6.5 to 8.5. If the pH of the discharged product is less than 6.0, or if the pH exceeds 9.0, the irritation to the scalp and skin tends to be strong.

In the foamable aerosol composition of the present invention, the above-mentioned aqueous stock solution is filled in an aerosol container, and then liquefied gas is filled therein to uniformly solubilize it in the aqueous stock solution. It is obtained by dissolving a part in the liquid phase part.

The pressure at 25 ° C. of the aerosol container filled with the aerosol composition is 0.15 to 0.6 MPa, further 0.2 to 0.5 MPa, in a state where the aerosol container is filled with a liquefied gas and uniformly solubilized. It is preferable that 0.3 to 0.9 in a state of being filled with a compressed gas and dissolved.
MPa, and more preferably 0.4 to 0.8 MPa.

The aerosol container filled with the aerosol composition comprises a container body and an aerosol valve having a valve attached to the opening of the container body to make the aerosol container airtight and switch discharge / stop of the aerosol composition. . An aerosol product can be obtained by mounting the discharge member on an aerosol container filled with the aerosol composition.

As the container body, a metal container such as aluminum or tin plate, a resin container such as polyethylene terephthalate, or a glass container such as pressure resistant glass is used, and the shape of the container body is not particularly limited.

Since the foamable aerosol composition of the present invention thus obtained has a uniform liquid phase portion of the aerosol composition comprising the aqueous stock solution, the liquefied gas and the compressed gas, the aerosol product can be handheld and discharged. In addition to the usual usage of, aerosol products can be used on walls, floors, tables, mirror stands,
It can be used by fixing it on a washbasin, kitchen, tile, etc., or by leaving it stationary.

Further, when the foamable aerosol composition of the present invention is discharged, the compressed gas dissolved in the liquid phase portion of the aerosol composition vaporizes in a short time, thus assisting the foaming by vaporization of the liquefied gas. Since the pH of the discharged product shifts to the alkaline side, the fatty acid becomes a fatty acid salt. As a result, even if the blending amount of the foaming agent (liquefied gas) is small, a discharge product having excellent foaming properties and holding properties can be obtained, and the condition of the discharge product is not affected by the temperature during use.

[0065]

EXAMPLES Next, the foamable aerosol composition of the present invention will be described in more detail based on examples, but the present invention is not limited to these examples.

The ingredients used in the examples are shown below. Lauric acid Trade name: Lunack L-98 (manufactured by Kao Corporation) Myristic acid Product name: Lunack MY-98 (manufactured by Kao Corporation) Stearic acid Product name: Lunac S-98 (manufactured by Kao Corporation) Myristyl alcohol Product name: Calcall 4098
(Manufactured by Kao Corporation) Cetanol Product name: Calcol 6098 (manufactured by Kao Corporation) Monococonut oil fatty acid POE (20) sorbitan Product name: TL-10 (manufactured by Nikko Chemicals) Lauroyl sarcosine sodium Product name: Sarcosinate LN-30 (Nikko Chemicals) Made) Lauryl glucoside Product name: Midol 12 (made by Kao Corporation) Polyoxyethylene (60) hydrogenated castor oil Product name:
HCO-60 (manufactured by Nikko Chemicals) Hydroxyethyl cellulose Product name: HEC SE
850 (manufactured by Daicel Chemical Industries, Ltd.) Glycerin Trade name: concentrated glycerin (manufactured by Kao Corporation) Propylene glycol Product name: Adeka PG (manufactured by Asahi Denka Co., Ltd.) N-methacryloylethyl N, N-dimethylammonium-α-N Methylcarboxybetaine / methacrylic acid alkyl ester copolymer liquid Product name: RAM resin-
1000 (Made by Osaka Organic Chemical Industry Co., Ltd.) Candelilla wax Product name: Candelilla wax N
O1 (Cerarica NODA)

Examples 1 to 3 Tables 1 to 3 show the compositions of the aqueous stock solutions of Example 1 (washing foam), Example 2 (styling agent, wax type) and Example 3 (shaving foam), respectively.

[0068]

[Table 1]

[0069]

[Table 2]

[0070]

[Table 3]

Next, the aqueous stock solution prepared with the above composition was added to a transparent pressure-resistant glass container, and after attaching a valve,
Liquefied gas (LPG) and compressed gas (carbon dioxide gas) were filled into the container through a valve to obtain aerosol compositions of Examples 1 to 3. Table 4 shows the content ratios of the aqueous stock solution, the liquefied gas and the compressed gas in the aerosol composition. In addition,
Regarding the pH measurement of the aerosol composition, when filling the glass container with the aqueous undiluted solution, put the pH test paper together and attach the valve, fill the liquefied gas and the compressed gas, and the compressed gas is the liquid phase part of the aerosol composition. It was judged from the color of the pH test paper in the state of being dissolved in.

[0072]

[Table 4]

Examples 4 to 5 and Comparative Example 1 Table 5 shows the composition of the aqueous stock solutions of Examples 4 to 5 and Comparative Example 1.

[0074]

[Table 5]

Next, the aqueous stock solution prepared with the above composition was added to a transparent pressure-resistant glass container, and after attaching a valve,
In Examples 4 to 5, liquefied gas (LPG) and compressed gas (carbon dioxide gas) were filled into the container through a valve, and in Comparative Example 1, only liquefied gas (LPG) was filled into the container through a valve. The aerosol compositions of Examples 4-5 and Comparative Example 1 were obtained. Table 6 shows the contents of the aqueous stock solution, the liquefied gas and the compressed gas in the aerosol compositions of Examples 4 to 5 and Comparative Example 1.

[0076]

[Table 6]

Test Evaluation (a) Precipitate in Aerosol Composition A transparent pressure-resistant glass container (100 ml in a full-filled amount) was filled with 60 g of the aerosol composition and stored at 25 ° C. for 3 months. The presence or absence of precipitates was visually confirmed in the aerosol composition after storage. Evaluation Criteria: No precipitate was confirmed. Δ: Fine precipitates that could pass through the aerosol valve were confirmed. X: A large deposit that could not pass through the aerosol valve was confirmed.

(B) Low-temperature foamable transparent pressure-resistant glass container (fully filled 100 ml) was filled with 60 g of the aerosol composition and stored at 5 ° C. for 1 day. Next, the aerosol composition after storage was discharged and the foaming state was confirmed. The foaming state was confirmed by comparing with the foaming state when the aerosol composition stored at 25 ° C. for one day was discharged. Evaluation Criteria A: The difference in foaming state from the product stored at 25 ° C. was small, and foaming was excellent. X: The difference in foaming state from the product stored at 25 ° C was remarkable, and almost no foaming occurred.

(C) Uniformity of Liquid Phase Part of Aerosol Composition A transparent pressure-resistant glass container (fully filled 100 ml) was filled with 60 g of the aerosol composition and stored at 25 ° C. for 1 month. The appearance of the aerosol composition after storage was evaluated. Evaluation Criteria ◯: Separation of the liquid phase portion was not confirmed, and it was in a uniform state (1 liquid). X: Separation of the liquid phase part was confirmed, and there were two phases.

Test Results For Examples 1 to 5 and Comparative Example 1, the evaluation results of the deposits in the aerosol composition, the low temperature foaming property, and the uniformity of the liquid phase portion and the aqueous stock solution, the liquid phase portion of the aerosol composition, Table 7 shows the pH measurement results of the discharge product.

The aerosol compositions of Examples 1 to 3 and 5 were stable even when the aerosol compositions were stored for a long period of time without any precipitate being confirmed. The aerosol composition of Example 4 is
A small amount of very small precipitates was confirmed, but the entire amount could be discharged without clogging with the aerosol valve.

Regarding the foamability at low temperature, the aerosol compositions of Examples 1 to 5 in which the pH of the discharged product fluctuates to form a fatty acid salt are excellent, but the pH of the discharged product does not fluctuate. The aerosol composition of Example 1 is easily affected by temperature and has extremely poor foamability at low temperatures.

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[Table 7]

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According to the present invention, fatty acids, alkaline agents,
An aerosol composition containing a liquefied gas and a compressed gas, and when the aerosol composition is discharged, part or all of the fatty acid is a foamable aerosol composition characterized by being a fatty acid salt with an alkali agent. It is possible to provide a foamable aerosol composition which can be discharged in a state of being placed on a washstand without the need to shake the container before discharging, and which can form stable bubbles regardless of temperature change.

─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. ⁷ Identification code FI theme code (reference) B65D 83/34 B65D 83/14 Z 83/36 F term (reference) 3E014 PA01 PB04 PD02 4C083 AA122 AB011 AB012 AB032 AB052 AB081 AC011 AC012 AC061 AC062 AC122 AC241 AC242 AC432 AC442 AC482 AC542 AC662 AD132 AD202 AD282 BB43 BB49 CC21 CC23 CC32 DD08 DD22 DD27 DD30 EE07 EE11 EE21

Claims (4)

[Claims] 1. An aerosol composition containing a fatty acid, an alkali agent, a liquefied gas and a compressed gas, wherein when the aerosol composition is discharged, a part or all of the fatty acid becomes a fatty acid salt by the alkali agent. And a foamable aerosol composition. 2. The foamable aerosol composition according to claim 1, which contains a higher alcohol. 3. The foamable aerosol composition according to claim 1, wherein the content of the liquefied gas is 0.1 to 10% by weight in the aerosol composition. 4. The foamable aerosol composition according to claim 1, wherein the compressed gas is carbon dioxide gas and / or nitrous oxide.