JPH0742225B2 - Foam skin cleansing composition - Google Patents

Description

TECHNICAL FIELD The present invention relates to a foamy skin cleansing composition having less skin irritation and excellent feeling of use and stability of foam.

(Prior Art) Conventionally, as foamy skin cleansing compositions, shaving foams, facial cleansers, and the like containing higher fatty acid salts, lauryl sulfate, acylglutamates, etc. as main components have been known. However, none of the higher fatty acid salts and lauryl sulfate salts are satisfactory in terms of skin irritation. Further, in the case of acylglutamate, there is a problem that the stability of foam is insufficient.

DISCLOSURE OF THE INVENTION In view of the above circumstances, the inventors of the present invention have conducted extensive studies, and as a result, have identified a specific amphoteric phosphate ester-based activator described below, a higher fatty acid and / or a salt thereof, water and a propellant. The present inventors have found that the compounded product is a foamy skin cleansing composition which is less irritating to the skin and is excellent in the feeling of use and the stability of the foam, and the present invention has been completed.

(Object of the Invention) That is, an object of the present invention is to provide a foamy skin cleansing composition which is less irritating to the skin and is excellent in feeling of use and stability of foam.

(Structure of the Invention) In the present invention, an amphoteric phosphate-based activator represented by the general formula (1), a higher fatty acid represented by the general formula (2) and / or a salt thereof, water and a propellant are blended. A foamy skin cleansing composition comprising:

General formula (1): (Here, R ₁ is a linear or branched saturated hydrocarbon group having an average carbon number of 8 to 18, and M ₁ is an alkali metal, ammonium, or triethanolamine.) General formula (2): R ₂ COOM ₂ (2) (wherein R ₂ is a linear or branched saturated or unsaturated hydrocarbon group having an average carbon number of 8 to 18 and M ₂ represents a hydrogen atom, an alkali metal, or an organic amine) (Constitution) The amphoteric phosphate ester activator used in the present invention may be produced according to the production method described in JP-A No. 61-141798, and is represented by the general formula (1). It is a thing.

These compounds may be used alone or in combination of two or more, and the compounding amount is preferably 1 to 20% by weight, more preferably 5 to 15% by weight based on the total amount of the composition.

The second essential component of the composition of the present invention, the higher fatty acid and / or its salt, is represented by the general formula (2).

The blending amount of these alone or in combination of two or more is preferably 0.1 to 10% by weight, more preferably 1 to 10% by weight based on the total amount of the composition.
~ 5% by weight.

Examples of the propellant used in the present invention include dichlorodifluoromethane, trichloromonofluoromethane, dichlorotetrafluoroethane, freon gas and propane, butane, liquefied petroleum gas (hereinafter abbreviated as LPG) and dimethyl ether. One or more gases may be applied.

Further, the blending amount thereof is preferably 8-10 with respect to the total amount of the composition.
% By weight.

The foamy skin cleansing composition of the present invention contains, in addition to the above-mentioned essential components, N-acyl acidic amino acid salt, N-acyl, N-alkyl amino acid salt, fatty acid alkanolamide, N-acyl peptide, if necessary. Ingredients generally used in foamy skin cleansing compositions such as moisturizers, higher alcohols, oils, bactericides, thickeners, pigments and fragrances can be added.

The composition of the present invention is applied to shaving foam, face wash, body wash, hand cleaner and the like.

The foamy skin cleansing composition of the present invention is, for example, a mixture of 2- (2-hydroxy-N-methylalkylamino) ethyl phosphoric acid ester alkali salt and water after being heated and mixed (65 to 75 ° C.) and then in a molten state. Add higher fatty acid with stirring, solubilize it, add a neutralizer if necessary, and adjust the stock solution by cooling, and fill this stock solution with a propellant (eg LPG) in a sealed container. Can be manufactured by.

(Example) Next, the present invention will be described in more detail with reference to examples. The effect was measured by the following evaluation method.

Skin irritation (protein denaturation rate) test method Using water-based high performance liquid chromatography, the ovalbumin denaturation rate when the sample was added to the ovalbumin PH7 buffer solution to a sample concentration of 1%, the absorption peak at 220 nm Was measured using.

Ho: 220 nm absorption peak height of ovalbumin Hs: 220 nm absorption peak height when the sample was added to the ovalbumin buffer solution The evaluation criteria were set as follows.

◎: Ovalbumin denaturation rate of less than 30% ◯: Ovalbumin denaturation rate of 30% or more and less than 60% △: Ovalbumin denaturation rate of 60% or more and less than 80% ×: Ovalbumin albumin denaturation rate of 80% or more Using a 30-year-old woman as a panelist, a sensory test by face washing was performed, and the feeling of foam, ease of rinsing, detergency,
The presence or absence of tightness and irritation on the skin after washing the face was comprehensively judged and evaluated according to the following criteria.

5: Very good usability 4: Somewhat good usability 3: Usual usability 2: Somewhat bad usability 1: Very poor usability In addition, the average value of the evaluation points of 30 panelists was used for each sample. It was used.

Foam stability evaluation method The sample raw material filled in a sealed container together with a propellant is injected into a 500 ml graduated cylinder to collect a fixed amount of foam, and the top of the graduated cylinder is seated and left standing. The rate of change in foam height was calculated from the foam height immediately after injection and the foam height after 30 minutes of standing, and the stability of the foam was evaluated according to the following criteria.

A: Change rate less than 1% Extremely stable foam B: Change rate 1-5% Stable foam C: 〃 5-10% Slightly unstable foam D: 〃 More than 10% Very unstable foam Example (1 ), (2), Comparative Examples (1) to (4) [Facial cleanser] (1) Composition The compound (A) of the general formula (1) having the composition shown in Table 1 is 2- (2).
-Hydroxy-N-methyldodecylamino) ethyl phosphate monosodium, propellant (A) is LPG
(3 kg / cm ² , 20 ° C).

(2) Preparation method After uniformly dissolving and mixing the stock solution composition, put it in a predetermined aerosol container, and attach a predetermined valve while deaerating the upper air with a vacuum pump. Then press-fill with propellant,
A face wash was prepared.

(3) Characteristics The various tests were conducted on the facial cleanser, and the results of examining the characteristics are shown in Table 4 at the end.

As shown in Table 4, good results were obtained in Examples (1) and (2) which are the foamy detergent compositions of the present invention.

Comparative Examples (1) and (2) were inferior in skin irritation, and the usability was not good. Comparative Example (3) was inferior in terms of foam stability and had a poor feeling in use.

Example (3), Comparative Examples (5) to (7) [Body cleaner] (1) Composition The compound (B) of the general formula (1) having the composition shown in Table 2 is 2- (2
-Hydroxy-N-methylmyristylamino) ethyl phosphate triethanolamine, the propellant (B) is dichlorodifluoromethane.

(2) Preparation method A body cleansing agent is prepared in the same manner as the preparation method of Example 1.

(3) Characteristics As shown in Table 4, Example (3) of the present invention obtained good results in various tests. Comparative Examples (5) and (6) did not give good results in terms of feeling of use and stability of foam, and Comparative Example (7) was not preferable in terms of skin irritation and feeling of use.

Examples (4), (5), Comparative Example (8) [Shaving Foam] (1) Composition The compound (C) of the general formula (1) having the composition shown in Table 3 is 2- (2).
-Hydroxy-N-methyldodecylamino) ethyl phosphate triethanolamine, propellant (C)
Is a mixture of LPG and dichlorodifluoromethane.

(2) Preparation Method A shaving foam is prepared in the same manner as the preparation method of Example 1.

(3) Characteristics As shown in Table 4, Examples (4) and (5) obtained good results in various tests. In Comparative Example (8), good results were not obtained in use feeling and foam stability.

(Effects of the Invention) As described above, it is apparent that the present invention provides a useful foamy skin cleansing composition which is less irritating to the skin and is excellent in the feeling of use and the stability of the foam.

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Claims (3)

[Claims] 1. An amphoteric phosphoric acid ester-based activator represented by the general formula (1), a higher fatty acid and / or a salt thereof represented by the general formula (2), water and a propellant. A characteristic foamy skin cleansing composition. General formula (1): (Here, R ₁ is a linear or branched saturated hydrocarbon group having an average carbon number of 8 to 18, and M ₁ is an alkali metal, ammonium, or triethanolamine.) General formula (2): R ₂ COOM ₂ ...... (2) (wherein R ₂ is a linear or branched saturated or unsaturated hydrocarbon group having an average carbon number of 8 to 18 and M ₂ is a hydrogen atom, an alkali metal or an organic amine) 2. A compound represented by the general formula (1)
The foamy skin cleansing composition according to claim 1, wherein 1 to 20% by weight is blended with one kind or a mixture of two or more kinds based on the total amount of the composition. 3. A compound according to claim 1, wherein one or a mixture of two or more higher fatty acids represented by the general formula (2) or a salt thereof is blended in an amount of 0.1 to 5% by weight based on the total amount of the composition.
The foamy skin cleansing composition according to the item.