JPH0748245A - Washing agent composition for body - Google Patents

Abstract

PURPOSE:To provide a washing agent composition for bodies, having a refreshing use touch, little in the adsorption to skins, having good safety, exhibiting sufficient foamability, and capable of being well used also in hard water. CONSTITUTION:The washing agent composition for bodies is characterized by simultaneously using the salt of a fatty acid not containing a <=12C fatty acid and an N-acyltaurine salt. The N-acyltaurine salt is suitably compounded in an amount of 0.1-30.0wt.%. When the salt of the fatty acid containing the <=12C fatty acid is used, the N-acyltaurine salt and a polyoxyethylene hardened caster oil are simultaneously used. The N-acyltaurine salt and the polyoxyethylene hardened caster oil are suitably compounded in amounts of 0.1-30.0wt.% and 0.1-30.0wt.%, respectively, based on the fatty acid salt and in a compounding ratio of 4:1 to 1:1. The adsorbability of the washing agent composition to skins is lowered without damaging the refreshing use touch of the fatty acid salt, and the foamability can be improved.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention has a high level of safety because it is less likely to adsorb a detergent component to the skin even when used in hard water, has a sufficient foaming power, and has a refreshing feeling of use. It relates to a personal cleansing composition.

[0002]

2. Description of the Related Art Hitherto, various surfactants such as fatty acid salts have been used in body cleansing compositions in order to provide cleansing and foaming properties. Fatty acid salts are often used because they give a refreshing feel when used. As other surfactants, monoalkyl sulfates, alkyl ether sulfates, α-olefin sulfonates, anionic surfactants such as amino acid-based surfactants, and betaine-based amphoteric surfactants are used. .

[0003]

However, regarding the fatty acid salt, the adsorptivity to skin, safety and foaming power differ depending on the composition of the fatty acid, and the salt of fatty acid having 12 or less carbon atoms has good foaming property. However, it is highly adsorbable to the skin and there is a problem in terms of safety. On the other hand, a salt of a fatty acid having 12 or more carbon atoms has low adsorptivity to the skin and is high in safety, but has poor foaming property, and is particularly remarkable when used in water with high hardness, which increases skin adsorptivity. There is also a deterioration in safety associated with.

[0004] In addition, other surfactants are difficult to obtain a refreshing feeling of use, and none of them are satisfactory in terms of foamability and safety. Furthermore, in order to compensate the above-mentioned drawbacks of fatty acid salts, magnesium ions in hard water,
Attempts have been made to capture calcium ions with chelating agents, but none are satisfactory in terms of safety and effects.

The present invention solves the above problems and is a safe and cleansing agent for the body which does not impair the refreshing feeling peculiar to fatty acid salts, has a small amount of detergent adsorbed on the skin, is safe, and has improved foamability. It is intended to provide an agent composition.

[0006]

In order to solve the above-mentioned problems, in the present invention, the skin adsorbability of the detergent is first lowered, so that the skin adsorbability is high and the carbon number of 12 or less, which is problematic in safety, It was decided to use salts of fatty acids that do not contain fatty acids. The inventors have found that the combined use of an N-acyl taurine salt can suppress an increase in the skin adsorption of the fatty acid salt in hard water and further improve the foaming property, and completed the present invention.

The N-acyl taurine salt used in the present invention is
It is an acylation product of taurine and a commonly used fatty acid, and the hydrogen remaining in the amino group may be substituted with an alkyl group such as a methyl group. For example, N-cocoyl methyl taurine salt, N-lauroyl methyl taurine salt, N-
Examples thereof include myristoyl methyl taurine salt and N-stearoyl methyl taurine salt. The blending amount of these N-acyl taurine salts is 0.1 to 30.
0 wt% is suitable.

Further, when N-acyl taurine salt and polyoxyethylene hydrogenated castor oil are added to the fatty acid salt in combination, even if the fatty acid salt contains a fatty acid salt having 12 or less carbon atoms, it is adsorbed on the skin. It has been found that a cleansing composition for personal use having a low property and a high safety is obtained. In this case, the N-acyl taurine salt content is 0.1 to 3 relative to the fatty acid salt.
0.0 wt%, polyoxyethylene hydrogenated castor oil content of 0.1 to 30.0 wt% to the fatty acid salt is suitable, N-acyl taurine salt and polyoxyethylene hydrogenated castor oil blending ratio However, when the weight ratio was 4: 1 to 1: 1, it was possible to obtain a cleansing composition having good foamability, skin adsorption, and safety.

[0009]

The cleansing composition for personal use according to the present invention has a refreshing feeling of use and has low adsorption to the skin, and therefore has low skin irritation and sensitization, and has a residual feeling after being slimy after use. Never have. Further, it has a good foaming property, and does not show a decrease in foaming property or an increase in skin adsorptivity even when used in hard water.

[0010]

EXAMPLES The features of the present invention will be described in detail with reference to Examples. Table 1 shows the formulations of Example 1 and Comparative Example 1, Comparative Example 2, and Comparative Example 3, and Table 2 shows Example 2 and Example 3.
The formulations of Comparative Example 4, Comparative Example 5, and Comparative Example 6 are shown. In Example 1 and Comparative Examples 1 to 3, first, lauric acid, myristic acid or palmitic acid was neutralized with potassium hydroxide (1) to
The potassium salt of each fatty acid in (3) is prepared, mixed with other components and homogenized. In addition, Example 2 and Comparative Example 4
6 to 6 are prepared by mixing (1) which is a potassium salt of coconut oil fatty acid and other components and homogenizing them.

[Table 1]

[Table 2]

With respect to the examples and comparative examples shown in Tables 1 and 2, the adsorptivity to the skin, the foaming property and the detergency were examined, and further the use test and the safety test were conducted.

(1) Adsorption to Skin The skin adsorption of the detergent composition is determined by sterilizing freeze-dried porcine skin (Lyophilized Porcine Skin, hereinafter referred to as L.P.
S. Abbreviated). That is, 5 mM / m
L of each sample solution P. S. After washing and rinsing, the mixture was acidified with hydrochloric acid to give L. P. S. The detergent composition adsorbed on was extracted and quantified by gas chromatography. Cleaning and rinsing were performed using ordinary tap water and hard water.

(2) Foaming property The foaming property of the detergent composition was measured by the Loss Miles method as a 10% by weight solution with tap water or hard water, and was tested three times for each Example and each Comparative Example. The average value is shown.

(3) Detergency 20 g of mixed fat and oil of beef tallow and soybean oil (1: 1), 0.25 g of monoolein, and 0.1 g of oil red were dissolved in 60 ml of chloroform to prepare a dirt bath, and slide glass was added to this. Soak and attach dirt to make a model piece of dirty glass. Further, each example and each comparative example were dissolved in tap water or hard water so as to be 10% by weight to prepare a sample solution. 6 pieces of model dirty glass pieces 1
As a set, the sample solution was washed with 700 ml of a linatsu type tester, rinsed and then dried. The model stain remaining on the glass piece was dissolved in 20 ml of chloroform, and the absorbance at 512 nm was measured.

(4) Usage test A total of 20 male and female panelists used each Example and each Comparative Example blindly, and sensory-evaluated the foaming, stain removal, refreshing feeling, after-feeling and irritation during use. . The results are shown by a comprehensive evaluation that averages the evaluations of 20 people. "◎; very good", "○;good","△;normal","×;bad" for foaming and stain removal, and "◎; very good", "○;yes" for a refreshing feeling, "△; Neither can be said", "×;No","◎;No","○; Almost no", "△;Somewhat", regarding the residual feeling
"X: Yes,""++; Very much," for stimulating feeling,
"+;Yes","±;Somewhat","-;No".

(5) Safety Test A 1.0 wt% aqueous solution of each Example and each Comparative Example was subjected to a closed patch test on the back for 48 hours using 30 panelists. The results were judged according to the judgment criteria shown in Table 3, and shown as the average value of the skin irritation index of 20 persons. The above test results are shown in Tables 4 and 5.

[Table 3]

[Table 4]

[Table 5]

As shown in Table 4, in Example 1 of the present invention, the skin adsorbability of the cleaning composition was low,
The skin irritation index was as high as 0.05, indicating high safety, the foamability was good, and the detergency was sufficient. Furthermore, even when used in hard water, no increase in skin adsorption, no decrease in foamability and no decrease in detergency were observed. Also, in the usage test, we have obtained a good evaluation for all items,
Good foaming was obtained, a refreshing feel was obtained at the time of use, and no residual feeling after use or irritation at the time of use was observed.

On the other hand, in Comparative Example 1 in which potassium laurate, which is a salt of a fatty acid having 12 carbon atoms, was blended, the skin absorbability was high, and the skin irritation index was high. It was Further, although the foamability in tap water was high, a remarkable decrease in foamability was observed in hard water. Regarding Comparative Example 2 in which potassium myristate, which is a salt of a fatty acid having 14 carbon atoms, and potassium palmitate, which is a salt of a fatty acid having 16 carbon atoms, is not blended, and N-cocoylmethyltaurine sodium is not blended, in hard water. Has a low foaming property and an increase in skin adsorption in hard water. Also in the use test, the evaluation of foaming was poor, and a slight feeling of irritation was also recognized. Regarding Comparative Example 3 in which only N-cocoylmethyltaurine sodium was blended as a surfactant component without blending a fatty acid salt, skin adsorption was low, skin irritation index was small, and there was no particular problem in safety, and foaming occurred. Although the property was also good, a refreshing feeling was not obtained at the time of use, and there was a residual feeling after being used after being used, and the evaluation was poor in these points in the use test.

As is clear from Table 5, in Examples 2 and 3 of the present invention, salts of fatty acids including salts of fatty acids having 12 or less carbon atoms such as caprylic acid, capric acid, and lauric acid were used. Even if it was contained, it had a low skin adsorptivity and a low skin irritation index, and no increase in skin adsorptivity was observed even when it was used in hard water, which was preferable in terms of safety. The foamability and detergency were good, and even when used in hard water, these reductions were not observed. In the use test, all the items were also evaluated as good, and it was evaluated that both foaming and stain removal were good, the product had a refreshing feeling of use, and there was no residual feeling or irritation.

On the other hand, in Comparative Example 4 in which only coconut oil fatty acid salt was mixed as a surfactant component and N-cocoylmethyl taurine salt and polyoxyethylene hydrogenated castor oil were not mixed, the skin adsorption property was tap water or hard water. Both were high and showed a high skin irritation index. Further, the foamability in hard water was also markedly reduced, and the feeling of irritation was strong.
In Comparative Example 5 in which coconut oil fatty acid salt and N-cocoylmethyl taurine salt were blended as surfactant components and polyoxyethylene hydrogenated castor oil was not blended, the skin adsorptivity was slightly high and the skin irritation index was also slightly higher. In the use test, it was also evaluated as having a feeling of irritation. Moreover, a refreshing feeling was not obtained and the after-sales feeling was strong. In Comparative Example 6 in which coconut oil fatty acid salt and polyoxyethylene hydrogenated castor oil were blended as surfactant components, and N-cocoylmethyl taurine salt was not blended, skin adsorption was considerably low, skin irritation index was also low, and safety was high. Although the above is almost good, the foaming property is rather poor, and the feeling in use was not evaluated very well.

[0021]

As described above, according to the present invention,
By using a fatty acid salt containing no fatty acids having 12 or less carbon atoms and having high skin adsorption and skin irritation, and N-acyl taurine salt in combination, the fatty acid salt has a low foaming property or in hard water. It was possible to improve the deterioration of the foaming property of No. 1 and to exert a refreshing feeling and no after-feeling, which are peculiar to fatty acid salts, which cannot be obtained with other surfactants.

Even when a salt of a fatty acid containing a fatty acid having 12 or less carbon atoms is used, the N-cocoylmethyl taurine salt and polyoxyethylene hydrogenated castor oil are added together to improve the skin adsorption property. It was possible to obtain a personal cleansing composition having low skin irritation, good foamability, no decrease in foamability even in hard water, and a refreshing feeling of use.

Claims (4)

[Claims] 1. A personal cleansing composition comprising a salt of a fatty acid containing no C 12 or less fatty acid and an N-acyl taurine salt. 2. The personal cleansing composition according to claim 1, wherein the N-acyl taurine salt is contained in an amount of 0.1 to 30.0% by weight based on the fatty acid salt. 3. A personal cleansing composition comprising a fatty acid salt, an N-acyl taurine salt and polyoxyethylene hydrogenated castor oil. 4. The content of N-acyl taurine salt is 0.1 to 30.0% by weight based on the fatty acid salt, and the content of polyoxyethylene hydrogenated castor oil is 0.1 to 3% based on the fatty acid salt.
The personal cleansing composition according to claim 3, wherein the composition is 30.0% by weight, and the mixing ratio thereof is 4: 1 to 1: 1 by weight.