JP2001247431A - Aerosol composition and aerosol product for depilation - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain an aerosol composition for depilation capable of providing a high hair removing effect and an aerosol product for depilation having excellent sprayability and preservability. SOLUTION: This aerosol composition comprises a stock solution containing an active ingredient, an alkali agent, an oil and fat component, a surfactant and water and a foaming agent and gradually foams after being discharged. The active ingredient is composed of a thioglycolic acid or its metal salt, the alkali agent is composed of a metal hydroxide, the oil and fat component is composed of a fatty acid and a higher alcohol, and a liquefied petroleum-based hydrocarbon being the foaming agent comprises isopentane or a mixture of >=70 mass % isopentane and <=30 mass % isobutane. The aerosol product is characterized by packing the aerosol composition and a propellant into an aerosol container of double structure.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hair removal aerosol composition and a product containing a thioglycolic acid compound as an active ingredient, and more particularly, to a foamable hair removal aerosol composition which gradually foams after discharge. Things and products.

[0002]

2. Description of the Related Art Hitherto, a hair remover containing thioglycolic acid as an active ingredient has been known, and its form has been known to be a foam or cream. These foam or cream depilatory agents soften or weaken the hair if left for a certain period of time with the appropriate amount applied on the target skin surface,
When the applied hair remover is wiped off from the skin surface, the hair is removed together with the hair remover, whereby a hair removal effect is obtained.

[0003] Foamed hair removers are preferred in that they have good extensibility and are easy to apply uniformly on the skin surface, but they have a low liquid density due to a large amount of air bubbles. Because of this, the amount of the liquid that adheres to the hair is small, and the amount of the active ingredient that substantially acts on the hair is small. Therefore, in order to obtain a sufficient hair removal effect for practical use, apply a large amount of hair removal agent for a long time. There is a problem that it is necessary to leave it unattended, which is inferior in practical economy and convenience.

[0004] On the other hand, a creamy hair remover is preferable in that it has a large amount of liquid adhering to the hair, but its liquid density is large, so that it has poor stretchability when applied to the target skin surface. In addition, there is a problem that it is difficult to apply the active ingredient evenly at the time of application.

[0005]

DISCLOSURE OF THE INVENTION The present invention has been made based on the above circumstances, and its object is to provide:
A large amount of the undiluted solution adheres to the hair, so that a sufficient amount of undiluted solution adheres to the hair, and furthermore, excellent elongation is obtained and uniform application can be achieved. As a result, a high hair removal effect can be advantageously obtained. To provide an aerosol composition for hair removal that can be used. It is another object of the present invention to provide a hair removal aerosol product which is filled with the hair removal aerosol composition and has excellent jetting properties and storage stability.

[0006]

An aerosol composition for hair removal according to the present invention comprises a stock solution containing an active ingredient comprising a thioglycolic acid compound, an alkali agent, a fat and oil, a surfactant and water, and a foaming agent. And foams gradually after being discharged.

In this hair removal aerosol composition,
The content ratio of the active ingredient in the stock solution is preferably 3 to 8% by mass, and the content ratio of the alkali agent is preferably 0.1 to 8% by mass.

It is preferable that the stock solution contains 90 to 99% by mass and the foaming agent contains 1 to 10% by mass.

[0009] In the above, the active ingredient comprises at least one selected from the group consisting of thioglycolic acid or a metal salt thereof, the alkali agent comprising a hydroxide of a metal, and the fat or oil selected from the group consisting of fatty acids and higher alcohols. Preferably,

The above blowing agent has a concentration of 0.2 M at 35 ° C.
It is preferred that the liquefied petroleum hydrocarbon has a vapor pressure of less than Pa, and that the liquefied petroleum hydrocarbon be composed of isopentane or a mixture of 70% by mass or more of isopentane and 30% by mass or less of isobutane.

The hair removal aerosol product of the present invention comprises a double-structured aerosol container having an inner container and an outer container, wherein the aerosol composition is filled in the inner container, and the propellant is contained in the outer container. Characterized by being filled with.

[0012]

The hair removal aerosol composition of the present invention is in a creamy state when discharged, but forms a foam by gradually evaporating the foaming agent on the skin surface to gradually foam. Therefore, when applied, the cream is in the form of a cream, so that the stock solution comes into contact with the hair and the amount of the stock solution attached to the hair is large, and the foam is then foamed to form a foam. As a result, it is easy to apply uniformly on the target skin surface. And since the said aerosol composition foams after adhering to hair, the foaming effect does not reduce the amount of undiluted solution adhering to hair.

Further, according to the aerosol product for hair removal of the present invention, in the double-structured aerosol container, since the stock solution and the propellant are held apart from each other, the pressure change in the inner container during the use process. As a result, there is no change in the properties of the hair removal aerosol composition, so that stable foaming properties are maintained until the end of use, and a composition containing an active ingredient having a corrosive action is stable for a long time. And can be saved.

[0014]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the aerosol composition for hair removal of the present invention will be described in detail. In the present invention, a stock solution is prepared by adding an active ingredient composed of a thioglycolic acid compound and an alkali agent at a required ratio to water, and also containing an oil and fat component and a surfactant. An aerosol composition for hair removal is obtained by adding a foaming agent to the stock solution. This hair removal aerosol composition is preferably used for hair removal by filling an inner container of a double-structured aerosol container having an injection valve and filling an appropriate propellant in an outer container of the aerosol container. Aerosol products.

<Water> Water forms a medium in a stock solution in which components of other stock solutions are dissolved, and purified water or ion-exchanged water is usually used. The water content is
In the stock solution, it is a ratio of other essential components and auxiliary components as a residue, and in practice, it is preferably, for example, 54 to 95.9% by mass.

<Active Ingredient> In the present invention, the active ingredient is in direct contact with the hair to soften or weaken the hair physically or chemically to form a state in which the hair can be easily removed. As a component, a thioglycolic acid compound is used. Specific examples of the thioglycolic acid compound include thioglycolic acid or a metal salt thereof. Examples of the metal salt include a metal salt of an alkali metal or an alkaline earth metal. For example, calcium thioglycolate can be suitably used. These can be used alone or in combination of two or more.

The content of the thioglycolic acid compound in the stock solution is in the range of 3 to 8% by mass, preferably 4 to 6% by mass. When the content of the thioglycolic acid compound in the undiluted solution is less than 3% by mass, the hair removal effect becomes practically inadequate. It is not preferable because the stimulus to the odor becomes strong.

<Alkali agent> The alkaline agent acts as an auxiliary component of the above-mentioned active ingredient, and enhances or promotes the hair removal effect of the active ingredient. As the alkali agent, an alkali metal or alkaline earth metal hydroxide is used, and specific examples thereof are not particularly limited. For example, lithium hydroxide, strontium hydroxide, barium hydroxide, calcium hydroxide, Sodium hydroxide, and potassium hydroxide, and the like,
These can be used alone or in combination of two or more. The content of the alkaline agent in the stock solution is 0.1 to 8% by mass, preferably 1 to 4% by mass.
It is. If the content is less than 0.1% by mass, the hair removal effect of the active ingredient may not be sufficiently exhibited,
On the other hand, if it is larger than 8% by mass, the hair removal effect does not increase,
Rather, it is not preferable because it damages the skin.

<Fats and Fats> The fats and oils have an effect of dissolving a foaming agent, which will be described later, in water of the stock solution, and also have a function of stabilizing the state of the active ingredient in the stock solution and preventing its precipitation. The fats and oils are not particularly limited, but specifically, caprylic acid, capric acid, lauric acid, myristic acid, palmitic acid, stearic acid,
Fatty acids having 8 to 22 carbon atoms such as oleic acid, linoleic acid, arachinic acid, eicoic acid, and behenic acid; and 8 to 22 carbon atoms such as caprylic alcohol, octyl alcohol, lauryl alcohol, cetyl alcohol, stearyl alcohol, myristyl alcohol, and behenyl alcohol. And 22 higher alcohols, which can be used alone or in combination of two or more. The above fats and oils are preferably contained in the stock solution at a ratio in the range of 0.5 to 20% by mass, particularly preferably in a ratio of 4 to 8% by mass.

<Surfactant> The surfactant promotes dissolution or emulsification of each component contained in the undiluted solution, and has a function of stabilizing its state. It has the effect of improving the properties. The surfactant is not particularly limited, and various surfactants such as a cationic surfactant, a nonionic surfactant, an anionic surfactant, and an amphoteric surfactant can be used. In particular, a nonionic surfactant can be suitably used.

Preferred nonionic surfactants include polyoxyethylene alkyl ethers such as dipolyoxyethylene alkyl ether phosphate, sorbitan fatty acid esters such as glyceryl monostearate and sorbitan monostearate, and lauryl dimethylaminoacetic acid. Examples of betaine include aminotriazole. These can be used alone or in combination of two or more. These surfactants are contained in the stock solution at a ratio of 0.5 to 10% by mass, preferably 4 to 8% by mass.

<Stock solution> A stock solution can be prepared by mixing or emulsifying each of the above components. In addition to the above essential components, auxiliary components described below can be appropriately added to this stock solution. By adding a foaming agent to this stock solution, the aerosol composition of the present invention is prepared.

<Auxiliary Components> To the stock solution, various other substances or compounds can be added as auxiliary components, if necessary. Examples of the auxiliary component include a thickening component, a moisturizing component, a lubricating component, a fragrance, a coloring agent, and the like. Examples of the thickening component include, but are not particularly limited to, bentonite, zeolite, methyl cellulose, hydroxyethyl cellulose, hydroxypropyl cellulose, cationized cellulose, xanthan gum, guar gum, starch, sodium hyaluronate, alginic acid, carrageenan, carboxyvinyl polymer,
Examples thereof include water-soluble polymer substances such as polyacrylic acid, polyvinyl alcohol, and polyethylene glycol, and are preferably contained at a ratio of 0.5 to 2% by mass.

The moisturizing component is not particularly limited, but ethylene glycol, diethylene glycol, triethylene glycol, propylene glycol,
Examples thereof include polyhydric alcohols such as glycerin and 1,3-butylene glycol, and fatty acid esters having 10 to 30 carbon atoms such as diisopropyl adipate, isopropyl myristate, isopropyl palmitate, and cetyl octanoate.

As lubricating components, dimethylpolysiloxane, methylphenylpolysiloxane, polysiloxane,
A chain or cyclic silicone such as decamethylpolysiloxane is used for liquid paraffin, squalene, squalane,
Examples include hydrocarbon oils such as petrolatum, powders such as zinc oxide, calcium carbonate, nylon powder, silica, talc, and silicon powder, and the like. The content ratio of the above various auxiliary components is 0.1 to 20% by mass, preferably 5 to 15% by mass in the stock solution.
It is preferred that

<Foaming agent> The foaming agent is contained in the above-mentioned stock solution in a partially or entirely dissolved state to form an aerosol composition. The foaming agent has the effect of producing a foam having a gentle foaming by being gradually vaporized by the human body temperature after the aerosol composition is applied on the skin surface, thereby forming a foam having excellent extensibility. Have.

As a foaming agent, 0.2 M at 35 ° C.
A liquefied petroleum hydrocarbon solvent having a vapor pressure of less than Pa, specifically, isopentane alone or used as a mixture of isopentane and isobutane, when the blowing agent is a mixture, isopentane is It is preferably contained in a proportion of 70% by mass or more.
Further, as the foaming agent, one prepared into a mixture having the above-mentioned vapor pressure using, for example, normal butane or normal pentane may be used. Further, in the aerosol composition, the stock solution contains 90 to 99% by mass and the foaming agent in a range of 1 to 10% by mass, and preferably the foaming agent in a range of 3 to 6% by mass. You.
If the content of the foaming agent is less than 1% by mass, the aerosol composition has insufficient foaming properties,
If it exceeds 10% by mass, the ejection pressure becomes excessively high, and it may not be possible to discharge the mixture in the form of a cream.

<Aerosol composition for hair removal> The aerosol composition for hair removal obtained as described above preferably has a stock solution viscosity of, for example, 50 to 4000 cps at 20 ° C. When applied, the time required to form a foam 1.5 times the volume is 5 times.
~ 100 seconds.

<Propellant> In the present invention, the propellant is not particularly limited, and for example, dimethyl ether, compressed gas, liquefied petroleum gas and the like can be preferably used. Examples include air, nitrogen gas (N ₂ ), nitrous oxide gas, carbon dioxide gas, oxygen gas, helium gas, argon gas, and neon gas. Specific examples of liquefied petroleum gas include propane,
Butane, pentane and the like can be mentioned, and a mixed gas thereof may be used. A plurality of propellant gases can be used in combination. Of these, compressed gas is particularly preferred, and nitrogen gas is particularly preferred.

<Aerosol Product> The hair removal aerosol composition formed by the above-mentioned stock solution and foaming agent can be combined with a propellant to form various forms of aerosol products, but preferably has a double structure. It is preferable to use an aerosol container to form an aerosol product. In this case, the inner container of the aerosol container is filled with the aerosol composition for hair removal, and the outer container of the aerosol container is filled with a propellant. Thus, the hair removal aerosol product of the present invention is obtained. According to such an aerosol product for hair removal, the aerosol composition and the propellant are separated from each other in the double-structured aerosol container, and the internal pressure of the inner container changes during the use of the aerosol product. Is small, the composition ratio of the foaming agent in the aerosol composition filled in the inner container is kept constant, and therefore, stable properties are maintained until the end of use, and good jettability is obtained. At the same time, stable foaming characteristics on the skin surface of the ejected matter are maintained.

Furthermore, the active ingredient contained in the hair removal aerosol composition of the present invention has a high corrosive action on metals. The contents of the double-structured aerosol container in the hair removal aerosol product are described below. The problem of corrosiveness of the active ingredient can be solved by making the container, for example, made of plastic or by coating the inner surface of the inner container.

According to such an aerosol product for hair removal, an aerosol composition is sprayed onto a portion on a target skin surface to discharge a required amount, and after foaming, the foam is spread and applied. After that, for example, for several minutes to about 10 minutes, leave the coated state, then wash with water,
Alternatively, a sufficient hair removal effect can be obtained by wiping off.

The aerosol composition as described above is discharged in a cream form from an aerosol container, but gradually foams due to the vaporization of the foaming agent due to the body temperature on the skin surface to form a foam. Therefore, by being creamy, the amount of the undiluted solution adhering to the hair is large,
In addition, since the composition is foamed and foamed after being applied, high extensibility is obtained, and as a result, it is easy to apply the composition uniformly on the target skin surface. Moreover, since the aerosol composition foams after adhering to the hair, the foaming does not reduce the amount of the undiluted solution adhering to the hair.

As a result, the thioglycolic acid compound and the alkali agent contained in the stock solution of the aerosol composition provide a high hair removal effect, and the skin is damaged by the oils and fats contained in the stock solution. Is prevented,
No unpleasant feeling is given.

[0035]

Hereinafter, embodiments of the present invention will be described.
The present invention is not limited by these. <Examples 1 to 5 and Comparative Examples 1 to 5> According to the formulation shown in Table 1, various components were mixed to prepare stock solutions A to E, and each of the stock solutions A to E was mixed with various foaming agents. Table 2
And an aerosol composition was prepared by mixing according to the formulation shown in Table 3. Then, each of the obtained aerosol compositions was filled in the inner container of the double-structured aerosol container, and nitrogen gas was filled in the outer container to prepare an aerosol product.

In Examples 1 to 5, an aerosol composition was prepared by mixing each of the stock solutions A to E with a blowing agent composed of isopentane or a mixture of isopentane and isobutane at a ratio shown in Table 2. This is an example of a case where an aerosol product for hair removal is produced from the composition. Comparative Examples 1 to 5 each prepared an aerosol composition by containing a liquefied petroleum gas having a vapor pressure of 0.4 MPa at 35 ° C. as a blowing agent in each of the stock solutions A to E at a ratio shown in Table 3. However, this is an example of a case where an aerosol product for hair removal is produced using this aerosol composition.

The following tests were performed on the aerosol products of the above Examples and Comparative Examples. (1) Measurement of liquid density Each aerosol product is kept in a thermostat set at a temperature of 25 ° C. for 30 minutes or more, and then shaken sufficiently, and then placed in a hemispherical specific gravity cup (weight: W). A sample was taken by spraying the contents. After elapse of 3 seconds from the injection, the sample of the portion raised above the upper edge of the specific gravity cup due to foaming is removed on a surface along the edge,
Weigh the gravity cup to the weight and W _1. Further, the same specific gravity cup filled with water at 20 ° C. was weighed, and its weight was used as W ₂ for calculating the liquid density. From the above results, the liquid density of each sample was calculated using the following equation.

[0038]

## EQU1 ## Liquid density = (W ₁ −W) / (W ₂ −W)

In the above formula, W ₁ is “weight at the time of sampling”, W ₂ is “weight of specific gravity cup filled with water”, and W is “weight of specific gravity cup”. Here, it is shown that those having a low liquid density have high foaming properties.

(2) Hair Removal Effect Each of the aerosol products is kept in a thermostat set at a temperature of 25 ° C. for 30 minutes or more, and then shaken sufficiently to discharge 5 g of the contents from each aerosol product. And applied on the skin surface of the human foot, using a finger, 5cm x 5c
m. After 5 minutes have passed since application, wipe off the contents with tissue paper,
The hair removal effect was evaluated by the degree of hair remaining. That is, "A" when all the hair that had grown on the application surface was removed, "B" when some hair remained on the application surface, and when hair remained on more than half of the application surface. Was evaluated as "C", and the case where the hair removal effect was hardly exhibited on the application surface was evaluated as "D".

(3) Foaming time The aerosol product obtained as described above is kept in a thermostatic chamber set at a temperature of 25 ° C. for 30 minutes or more, and placed in a thermostatic chamber set at a temperature of 25 ° C. 10 ml graduated cylinder is stored in advance and sprayed into the graduated cylinder from a well shaken aerosol product.
Samples were taken. Thereafter, the time required for the sample to foam at 25 ° C. to reach a volume of 7.5 ml was measured, and this time was determined as the foaming time.

[0042]

[Table 1]

[0043]

[Table 2]

[0044]

[Table 3]

From the results shown in Tables 2 and 3, Example 1 was obtained.
Each of Nos. 5 to 5 has a relatively large liquid density and an excellent hair removing effect, and has a foaming time of 10 to 60 seconds, and gradually foams from cream to foam. Has been confirmed. On the other hand, those of Comparative Examples 1 to 5 have a small liquid density and a low hair removal effect, and have a foaming time of 0.5 to 3 seconds, and have a property of rapidly foaming. Met.

From the above results, it can be seen that Example 1 having a high liquid density was obtained.
It is clear that Nos. 1 to 5 have a larger amount of liquid adhering to the hair of the undiluted solution than each of Comparative Examples 1 to 5, and as a result, according to each of Examples 1 to 5, Excellent hair removal effect was obtained. Further, in Examples 1 to 5, since the foam shows gradual foaming, before forming the foam, the hair removal aerosol composition is applied to the target skin surface and then uniformly applied. It was easy.

[0047]

The aerosol composition for hair removal of the present invention is creamy in a discharged state, but forms a foam by gradually foaming as the foaming agent gradually vaporizes on the skin surface. is there. Therefore, when applied, the cream is in the form of a cream, so that the stock solution comes into contact with the hair and the amount of the stock solution attached to the hair is large, and the foam is then foamed to form a foam. As a result, it is easy to apply uniformly on the target skin surface. And since the said aerosol composition foams after adhering to hair, the foaming effect does not reduce the amount of undiluted solution adhering to hair.

Further, according to the aerosol product for hair removal of the present invention, in the double structure aerosol container, since the stock solution and the propellant are held apart from each other, the pressure change in the inner container during the use process. As a result, there is no change in the properties of the hair removal aerosol composition, so that stable foaming properties are maintained until the end of use, and a composition containing an active ingredient having a corrosive action is stable for a long time. And can be saved.

Continued on the front page F term (reference) 4C083 AB032 AB051 AB172 AB432 AB442 AC011 AC012 AC022 AC071 AC072 AC122 AC182 AC241 AC242 AC342 AC422 AC442 AC712 AC771 AC772 AC852 AC902 AD152 AD282 BB01 BB11 CC18 DD08 DD47 EE05

Claims (9)

[Claims] 1. A foaming agent comprising an undiluted solution containing an active ingredient comprising a thioglycolic acid compound, an alkali agent, a fat and oil, a surfactant and water, and a foaming agent. An aerosol composition for hair removal, characterized in that: 2. The content ratio of the active ingredient in the stock solution is 3
-8% by mass, and the content of the alkali agent is 0.1-8%.
The hair removal aerosol composition according to claim 1, wherein the composition is in mass%. 3. The hair removal aerosol composition according to claim 1, wherein the stock solution comprises 90 to 99% by mass and the foaming agent comprises 1 to 10% by mass. 4. The method according to claim 1, wherein the active ingredient is thioglycolic acid or a metal salt thereof.
An aerosol composition for hair removal according to any one of the above. 5. The hair removing aerosol composition according to claim 1, wherein the alkaline agent comprises a metal hydroxide. 6. The hair removal aerosol composition according to claim 1, wherein the fat or oil comprises at least one selected from the group consisting of fatty acids and higher alcohols. 7. A blowing agent having a pressure of 0.2 MPa at 35 ° C.
The aerosol composition for hair removal according to any one of claims 1 to 6, comprising a liquefied petroleum hydrocarbon having a vapor pressure of less than 7. 8. The method according to claim 7, wherein the liquefied petroleum hydrocarbon constituting the foaming agent comprises isopentane or a mixture of 70% by mass or more of isopentane and 30% by mass or less of isobutane. Aerosol compositions for hair. 9. A double-structured aerosol container comprising an inner container and an outer container, wherein the inner container is filled with the aerosol composition according to any one of claims 1 to 8, and a propellant is provided. An aerosol product for hair removal characterized by being filled in an outer container.