JP2652870B2 - Foam hair removal composition - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a foam hair remover, and more particularly, to a hair remover which has excellent hair removal properties, has good stability of foam after squirting, and does not slide down on the skin after application. The present invention also relates to a foamy hair remover having low skin irritation.

(Prior art) Foamed hair removers are being accepted by the market because they are easier to handle than conventional hair removers.

However, conventional foam removers have the following disadvantages, and none have been satisfactory.

(1). Has skin irritation.

(2). After squirting onto the skin, it flows down from the surface before the hair removal process is completed and hair removal cannot be performed completely.

(3). Poor hair removal performance.

(4). During use, the valve may be clogged and jetting failure may occur.

As described above, there has never been a solution to all of the above problems, and there has been a demand for the development of a foam depilatory agent having no skin irritation and excellent hair removal performance.

DISCLOSURE OF THE INVENTION Accordingly, the present inventor has conducted intensive studies in view of such a situation, and as a result, has found that a polyoxyethylene alkyl ether-based nonionic surfactant having a specific HLB, sodium thioglycolate, and calcium hydroxide And a propellant in a specific amount have been found to solve the above problems and have completed the present invention.

(Object of the Invention) It is an object of the present invention to provide a foam depilatory composition which has excellent hair removal properties, has good stability of foam after squirting, does not slide down on the skin after application, and has little skin irritation. Is to do.

(Constitution of the Invention) The present invention relates to a polyoxyethylene alkyl ether-based nonionic surfactant having a weighted average HLB of 10.5-13.5.
7% by weight and 2-5% by weight of sodium thioglycolate
And 1 to 3% by weight of calcium hydroxide and 2 to 6% by weight of a propellant.

(Specific Description of Configuration) The polyoxyethylene alkyl ether-based nonionic surfactant used in the present invention is a lipophilic surfactant having an HLB of less than 9, a surfactant having an HLB of 9 to 11, and a hydrophilic interface having an HLB of more than HLB11. Combinations with activators are preferred.

Examples of lipophilic surfactants having an HLB of less than 9 include polyoxyethylene (2) cetyl ether, polyoxyethylene (2) stearyl ether, and polyoxyethylene (5).
Behenyl ether, etc., and these are used alone or in combination of two or more, preferably 0.5% by weight or more.

As surfactants for HLB 9-11, polyoxyethylene (2) lauryl ether, polyoxyethylene (5.5)
Cetyl ether, polyoxyethylene (10) behenyl ether and the like can be mentioned, and these are used alone or in combination of two or more, preferably 0.5% by weight or more.

Polyoxyethylene (4.2) lauryl ether, polyoxyethylene (21) lauryl ether, polyoxyethylene (10)
Cetyl ether, polyoxyethylene (15) cetyl ether, polyoxyethylene (20) cetyl ether, polyoxyethylene (30) cetyl ether, polyoxyethylene (20) stearyl ether, polyoxyethylene (20) behenyl ether, polyoxy Ethylene (25) lauryl ether and the like can be mentioned, and these are used alone or in combination of two or more, preferably 0.5% by weight or more.

The foam depilatory provided by the present invention is selected such that the weighted average HLB value of the above three polyoxyethylene alkyl ether-based nonionic surfactants is preferably 10.5 to 13.5, more preferably 11 to 13. Is done. If the weighted average HLB is out of this range, the hair removal performance and foam stability tend to decrease.

The total amount is 5 to 7% by weight. If it is less than 5% by weight, it is difficult to form a foam, and if it exceeds 7% by weight, it becomes foamy but hardly collapses, so that the adhesion to hair is deteriorated and the hair removal performance may be reduced.

The amount of sodium thioglycolate is 2 to 5% by weight, preferably 2.5 to 4.5% by weight. If it is less than 2% by weight, the hair removal performance will be extremely poor, and if it exceeds 5% by weight, the irritancy to the skin will increase.

The amount of calcium hydroxide is 1 to 3% by weight, preferably 1.2%.
2.8% by weight. If it is less than 1% by weight, the alkalinity is reduced and the hair removal performance is poor.

In order to form a foam, liquefied petroleum gas or oleon gas, which is a propellant, is further applied, and the compounding amount is 2 to 6% by weight.
If it is less than 2% by weight, the gas pressure is drastically reduced and the jetting performance is poor. If it exceeds 6% by weight, the foaming property becomes strong and the stability of the foam becomes poor.

The foamed depilatory composition of the present invention may contain, in addition to the above-mentioned raw material components, active ingredients such as fragrances, anti-inflammatory agents, deodorants, and the like. The use of an aerosol container (bolt material, coating agent), a valve (material, stem orifice diameter, housing diameter), a button (diameter), and the like can be appropriately adjusted within a well-known technical range. Hereinafter, the present invention will be described with reference to examples of the present invention.

In addition, the test method of the hair removal performance, foam stability, skin irritation, etc. of the foam hair removal composition described in the examples is as follows.

(1). Hair removal performance Ten human hairs are fixed on a glass plate, and a foam hair remover is spouted on the human hair, and the time from when the first one shrinks to when the last one shrinks is measured. These measurements are performed in a constant temperature room at 30 ° C.

 The evaluation was performed according to the following criteria.

Time Evaluation Symbol 7 minutes to 15 minutes Good ○ 15 minutes to 30 minutes Somewhat good △ 30 minutes or more Bad × (2). Foam stability Foamed hair remover on a glass plate
(About 4 cm) and set the glass plate vertically to measure the time until the bubbles slide down. Conduct in a constant temperature room at 30 ° C as in (1).

 The evaluation was performed according to the following criteria.

Some time Evaluation Code 10 minutes or less to 20 minutes bad × 10 minutes good △ 20 minutes or more good ○ (3). Skin irritation Foamed hair remover is sprayed on the skin of the dehaired rabbit, left as it is for 20 minutes, then washed with water, and the state of the skin after one hour has elapsed is determined according to the following criteria. went.

-: No erythema is observed.

±: Slight erythema is observed.

+: Erythema is recognized.

The specifications of the aerosol container applied to the tests (1) to (3) are as follows.

A. Can stainless steel non-coated a. Valve Duracon resin stem orifice diameter 0.
5mm c. Button Polypropylene Examples 1-3, Comparative Examples 1-4 (2) Preparation method POE (20) stearyl ether, POE (2) stearyl ether, and POE (4) stearyl ether are uniformly dissolved by heating. Heat sodium thioglycolate, calcium hydroxide, and purified water to mix uniformly. After emulsifying both, a fragrance is introduced and cooled to room temperature. A predetermined amount of the foamed depilatory solution was charged into a container, a valve was inserted and crimped, and then liquefied petroleum gas was injected to obtain a foamed depilatory composition.

(3) Properties Table 1 shows the results of the above-mentioned tests performed on each of the foam hair removers.

As shown in Table 1, Examples 1 to 3 which are the foam depilatory compositions of the present invention obtained good results in various tests.

In Comparative Example 1, the amount of the polyoxyethylene alkyl ether-based surfactant was small, the foam was not foamed, and after application to the skin, the original purpose could not be achieved.

In Comparative Example 2, the amount of the polyoxyethylene alkyl ether-based surfactant was large, the foam was firm and hard to collapse, the adhesion to hair was poor, and the hair removal performance was reduced.

In Comparative Example 3, since the polyoxyethylene alkyl ether-based nonionic surfactant had a high HLB, the foam was strong and the retention time as a foam powder was unnecessarily long, making it difficult to use.

Comparative Example 4 was the same as Comparative Example 1 without foam because the HLB of the polyoxyethylene alkyl ether-based nonionic surfactant was low.

Examples 4 to 6, Comparative Examples 5 and 6 (2) Preparation method POE (21) lauryl ether, POE (10) behenyl ether, and POE (5) behenyl ether are heated and uniformly dissolved. Heat sodium thioglycolate, calcium hydroxide, and purified water to mix uniformly.

After emulsifying both, a fragrance is introduced and cooled to room temperature.
A predetermined amount of the foamed depilatory solution was charged into a container, a valve was inserted and crimped, and then liquefied petroleum gas was injected to obtain a foamed depilatory composition.

(3) Properties Table 1 shows the results of the above-mentioned tests performed on each of the foam hair removers.

As shown in Table 1, Examples 4 to 6, which are the foam depilatory compositions of the present invention, obtained good results in various tests.

In Comparative Example 5, the amount of sodium thioglycolate was small, the hair removal performance was poor, and the original purpose could not be achieved.

In Comparative Example 6, the content of sodium thioglycolate was large, and skin irritation was strong.

Examples 7 to 9, Comparative Examples 7 and 8 (2) Preparation method POE (23) cetyl ether, POE (5.5) cetyl ether, and POE (2) stearyl ether are heated and uniformly dissolved. Heat sodium thioglycolate, calcium hydroxide, and purified water to mix uniformly. After emulsifying both, a fragrance is introduced and cooled to room temperature. A predetermined amount of the foamed depilatory solution was charged into a container, a valve was inserted and crimped, and then liquefied petroleum gas was injected to obtain a foamed depilatory composition.

(3) Properties Table 1 shows the results of the above-mentioned tests performed on each of the foam hair removers.

As shown in Table 1, Examples 7 to 9, which are the foam depilatory compositions of the present invention, obtained good results in various tests.

In Comparative Example 7, the amount of calcium hydroxide was small, the hair removal performance was poor, and the original purpose could not be achieved.

In Comparative Example 8, the content of calcium hydroxide was large, and skin irritation was strong.

(Effect of the Invention) As described above, the present invention (1) has excellent hair removal performance,
(2) It is clear that the foam after jetting has good stability, does not slide down on the skin after application, and (3) provides a foamy hair remover with little skin irritation.

Claims (1)

(57) [Claims] 1. A polyoxyethylene alkyl ether-based nonionic surfactant having a weighted average HLB of 10.5-13.5.
7% by weight and 2-5% by weight of sodium thioglycolate
And 1 to 3% by weight of calcium hydroxide and 2 to 6% by weight of a propellant.