JPH01238521A - Liquid skin detergent composition - Google Patents

Abstract

PURPOSE:To obtain the subject composition, containing basic amino acid salts of lauric acid and myristic acid in a specific proportion and further a higher fatty acid, excellent in bubble performance and capable of exhibiting good liquid properties even at low temperatures. CONSTITUTION:A composition containing a basic amino acid salt of lauric acid and basic amino acid salt of myristic acid at 5:5-2:8 weight ratio. The total amount of both is 15-30wt.% and a higher fatty acid, preferably an 8-12C, especially 12-16C fatty acid in an amount of 0.5-5wt.%, preferably 1-3wt.% is contained therein. The above-mentioned composition is good in foaming and creaminess of bubbles with excellent stability at low temperatures without causing deposition of crystals or deterioration in fluidity.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a liquid skin cleansing composition that has excellent foaming performance and exhibits good liquid properties even at low temperatures.

[Problems to be solved by conventional techniques and inventions] Conventionally,
As skin cleansers, solid products made of hardened soap or synthetic surfactants are often used.

However, these solid skin cleansers crumble when dissolved.

It has various drawbacks such as being prone to cracking and being difficult to foam.

On the other hand, to solve the drawbacks of solid skin cleansers, skin cleansers with cream or liquid formulations are commercially available, but creams do not spread well in water and are difficult to use. Not only is it inconvenient to use, but it also becomes hard at low temperatures such as in winter, making it difficult to remove from containers such as tubes, and when stored for long periods of time or at high temperatures such as summer, the viscosity decreases significantly, leading to a decline in product value. be.

On the other hand, liquid products also suffer from crystal precipitation and assimilation when stored at low temperatures, resulting in loss of fluidity.

To address these drawbacks of liquid skin cleansers, the main base surfactant can be replaced with highly water-soluble synthetic surfactants such as sulfonic acid anionic surfactants, sulfate ester anionic surfactants, and amphoteric surfactants. There are examples of this being handled by doing this. However, when a large amount of such a surfactant is used as a main ingredient, new problems arise, such as irritation to the skin and significant sliminess during rinsing. In addition, when alkaline earth soaps such as sodium fatty acid or potassium fatty acid are used as the main base material, it is possible to eliminate the slimy feeling during rinsing, but the detergent becomes highly alkaline and may irritate the skin. A problem arises in that crystal precipitation occurs at low temperatures. Furthermore, when an N-acylamino acid-based anionic surfactant is used as the main base material, although it has the advantage of being less irritating, there are problems such as reduced foaming and slimy feeling during rinsing.

The present invention solves the above-mentioned drawbacks of liquid skin cleansers, and has no skin irritation, high safety for the skin, good rinsability, excellent foaming and creaminess of foam, and low temperature. It is an object of the present invention to provide a liquid skin cleansing composition that exhibits good liquid properties even under low conditions.

[Means and effects for solving the problem] The present inventors conducted intensive research to achieve the above object, and found that among higher fatty acid amine salts, which have been known as hypoallergenic surfactants, especially higher fatty acids. It was discovered that the basic amino acid salt of 2000 was safe for the skin and had excellent foaming performance.

As a result of further investigation, we found that the higher fatty acid basic amino acid salts are lauric acid basic amino acid salts and myristic acid basic amino acid salts in a specific ratio, that is, in a weight ratio of former:latter = 5 = 5 to 2:8. By using these together, and by incorporating free higher fatty acids into the composition, the resulting liquid skin cleansing composition has excellent foaming properties such as foaming and creaminess, and has good stability at low temperatures. The present invention was based on the discovery that crystals do not precipitate or fluidity decreases, and the liquid property is excellent at low temperatures.

The present invention will be explained in more detail below.

The liquid skin cleansing composition according to the present invention is as described above.

(I) Lauric acid basic amino acid salt.

Contains (n) myristic acid basic amino acid salt and (m) higher fatty acid as essential components.

Here, the basic amino acid salts of lauric acid and myristic acid used as components CI) and (II) are obtained by neutralizing lauric acid and myristic acid with basic amino acids, respectively. In this case, basic amino acids include lysine, arginine, histidine, ornithine, and the like. When these basic amino acids are used for neutralization, one type thereof may be used alone, or two or more types may be used in combination.

In the present invention, the above components (1) and (■) are used together in a weight ratio of 5:5 to 2:8. If it is added, the foam performance, especially the creaminess of the foam, will be reduced.On the other hand, if a large amount of component [■], i.e., myristic acid basic amino acid salt, is added, the stability at low temperatures will be reduced, and the foam will be less stable at low temperatures. Unable to maintain good sex.

Incidentally, the blending amount of the above-mentioned component (11, (If) is appropriately selected within the range of the above-mentioned ratio, but both components [I].

(The total amount of Ill is 15 to 30% (wt%) of the total amount of the composition.
, hereinafter the same) is preferable, 1
If it is less than 5%, the foam performance may be inferior, and 30%
If it exceeds 100%, the stability at low temperatures may decrease.

The higher fatty acid of the component (nl) of the present invention has 8 carbon atoms.
-22, especially those of 12-16 are preferably used. In this case, the fatty acid may be saturated or unsaturated, and may be linear or branched. Specifically, capric acid, lauric acid, myristic acid, palmitic acid, stearic acid, behenic acid, oleic acid, isostearic acid, etc. can be mentioned, and one type thereof can be used alone or two or more types can be used in combination. be able to.

The amount of the component CI[[] to be blended can be selected as appropriate, but it is preferably 0.5 to 5%, more preferably 1 to 3%, based on the total amount of the composition. Contains 0.5%
If it is less than 5%, the stability at low temperature may be reduced, and if it is more than 5%, the foam performance may be poor and the low temperature stability may be reduced.

In addition to the above ingredients, the liquid skin cleansing composition of the present invention includes:
If necessary, components used in ordinary skin cleansing compositions can be added in amounts within a range that does not impair the effects of the present invention. Such additive ingredients include higher alcohols,
Examples include superfatting agents such as higher fatty acid glycerides, humectants such as glycerin, propylene glycol, sorbitol, polyethylene glycol, and pyrrolidone carboxylates, bactericidal agents, anti-inflammatory agents, antioxidants, chelating agents, pigments, and fragrances.

〔Example〕

EXAMPLES Hereinafter, the present invention will be specifically explained with reference to Examples and Comparative Examples, but the present application is not limited to the Examples below.

The performance evaluation method and criteria for each side are shown below.

1.0 g of a creamy foam sample was taken into hand and subjected to a hand washing test by a panel of 10 people.

In this case, 20% potassium myristate salt, 5% propylene glycol, and 75% purified water were heated and mixed, dissolved, and then cooled and evaluated according to the following criteria as a control sample, and the average evaluation value of 10 panelists was calculated. The results are shown below.

Rating 5: Clearly superior to the control sample.

4: Slightly better than n.

3:I! Equivalent to .

2: Slightly inferior to .

1: Clearly inferior to n.

2. 100 g of liquid sample at low temperature was sealed in a glass bottle and stored at 0° C. for one month, and the fluidity of the sample was visually determined.

10: Shows good fluidity.

X: Severe precipitation of crystals, solidification and no flow. .

1-3 Comparative Examples 1-3 Lysine laurate, lysine myristate, lauric acid,
A liquid skin cleansing composition containing propylene glycol and purified water in the proportions shown in Table 1 was prepared.

In this case, the composition is prepared by adding lysine laurate, lysine myristate, and propylene glycol to purified water, heating and dissolving the mixture, adding lauric acid, which has been separately heated and dissolved, and uniformly dissolving the mixture. This was done by cooling to room temperature under stirring.

The resulting skin cleansing composition was evaluated for foaming performance and liquid properties at low temperatures. The results are shown in Table 1.

Table 1 From the results shown in Table 1, the liquid cleaning composition of the present invention had good foaming and creaminess of the foam, and was excellent in stability at low temperatures.

4-6 Ratio 4-6 Using each component shown in Table 2, a liquid skin cleansing composition was prepared in the same manner as in the example above, and its foam performance and liquid properties at low temperatures were evaluated. The results are shown in Table 2.

Table 2 From the results shown in Table 2, it was confirmed that the liquid cleaning composition of the present invention exhibited excellent foaming performance and low-temperature stability.

〔Effect of the invention〕

According to the present invention, by using lauric acid basic amino acid salt and myristic acid basic amino acid salt together in a specific ratio and blending a higher fatty acid, the resulting liquid skin cleansing composition generates crystals even at low temperatures. It maintains good liquid properties without causing any drop in flowability, foams well, has a creamy foam, and has an excellent feeling of use.

Applicant Lion Co., Ltd. (and 1 other person) agent
Patent attorney Takashi Kojima

Claims (1)

[Claims] 1. A liquid skin cleansing agent containing lauric acid basic amino acid salt and myristic acid basic amino acid salt in a weight ratio of 5:5 to 2:8, as well as higher fatty acid. Composition.