JP2002226360A - Cleaning cosmetic - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prepare a cleaning cosmetic having fresh functionality which is free from sticky feeling. SOLUTION: The cleaning cosmetic contains an amphoteric surfactant of formula (1) (wherein, Rx and Ry are each an 8-20C hydrocarbon chain).

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] The present invention relates to a cosmetic for cleaning.

[0002]

2. Description of the Related Art Various types of surfactants are incorporated in cosmetics according to the purpose. Among them, amphoteric surfactants are used in combination with anionic surfactants or nonionic surfactants, especially in combination with anionic surfactants, such as hair cleansing agents such as shampoos and cosmetics for washing face wash. Many are blended. However, when an amphoteric surfactant is blended into a cleaning cosmetic, it causes a large stickiness and has a practical problem. In addition, the cleaning cosmetics containing an anionic surfactant or the like have a problem that a slightly irritating discomfort may be caused on sensitive skin or the like.

[0003]

The problem to be solved by the present invention is to develop a cleansing cosmetic composition which has no stickiness in use. Another object of the present invention is to develop a cleansing cosmetic composition having no irritating discomfort derived from an anionic surfactant or the like.

[0004]

Means for Solving the Problems As a result of intensive studies in view of the above circumstances, the present inventor has found that a cleansing cosmetic containing an amphoteric surfactant having a specific structure described below has no stickiness and has a very refreshing feeling. And completed the present invention. In addition, when blending an amphoteric surfactant having a specific structure described below with a cleaning cosmetic containing an anionic surfactant,
The present inventors have found that the irritating discomfort is remarkably alleviated, and completed the present invention.

That is, claim 1 of the present invention provides a compound represented by the general formula (1):

[0006]

Embedded image (Rx and Ry are hydrocarbon chains having 8 to 20 carbon atoms)
It is a cosmetic for cleaning characterized by containing the amphoteric surfactant represented by these.

A second aspect of the present invention is the cosmetic for cleaning according to the first aspect, wherein the cosmetic contains an anionic surfactant.

[0008]

Next, an embodiment of the present invention will be described. The amphoteric surfactant according to the present invention is easily synthesized by the following reaction scheme.

[0009]

Embedded image (Rx and Ry are hydrocarbon chains having 8 to 20 carbon atoms;
(EA is triethylamine, THF is tetrahydrofuran.)

The number of carbon atoms in the long hydrocarbon chain of the amphoteric surfactant according to the present invention is arbitrarily selected from 8 to 20.
The amphoteric surfactant is added to the cleansing cosmetic composition of the present invention in an amount of 0.0
It is blended in an amount of from 01 to 30% by mass. Examples of the anionic surfactant to be incorporated in the cleansing cosmetic composition of the present invention include fatty acid soap, ether carboxylate, N-acyl sarcosine salt, N-acyl glutamate, α-olefin sulfonate, and alkyl ether sulfate. Salts, alkyl phosphates, alkyl ether phosphates and the like. These anionic surfactants are incorporated in the cosmetic detergent of the present invention in an amount of 0.1 to 70% by mass. Further, a cationic surfactant, a nonionic surfactant, and an amphoteric surfactant can also be blended. The cleansing cosmetic of the present invention is a cleansing cosmetic applicable to all skin and hair. Hereinafter, the present invention will be described with reference to examples. The numerical value of the compounding amount is% by mass. The sensory test method described in the examples is as follows.

Sensory test method The characteristics of the samples after 20 subjects were continuously used for 10 days were evaluated. The evaluation was based on the number of respondents who answered, "There was no stickiness, but rather a refreshing feeling" to the questionnaire items of the sensory test. In addition, in the case of a cosmetic detergent containing an anionic surfactant, a sensation of irritating irritability was evaluated as a sensory test evaluation item for irritating discomfort,
The number of respondents who did not feel this irritation was shown.

[0012]

Example 1 Washing lotion [Composition] Amphoteric surfactant A glycerin 4.0 1, wherein Rx and Ry in the above general formula (1) are hydrocarbon chains having 0.5 carbon atoms. 3-butylene glycol 4.0 ethanol 7.0 methyl paraben 0.5 citric acid 0.01 sodium citrate 0.1 fragrance 0.05 purified water remaining

The above components were mixed by a conventional method to obtain a lotion for washing. This is a sample of Example 1. A washing lotion obtained by mixing the same components except that betaine lauryl acetate was used instead of the amphoteric surfactant A was used as a sample of Comparative Example 1. As a result of comparing the sensory characteristics of these samples during use according to the above-described evaluation test (evaluation of refreshing feeling), the number of persons who answered that "there was no stickiness, but rather a refreshing feeling" was found in the samples of Example 1. There were 17 out of 20 persons and 2 out of 20 persons in the sample of Comparative Example 1.

Example 2 Face Wash [Composition] In the above formula (1), Rx and Ry are a hydrocarbon chain having 5.0 carbon atoms. Amphoteric surfactant A Potassium laurate 5.0 POE (2 ) Sodium lauryl ether sulfate 5.0 POE (5) Coconut fatty acid monoethanolamide 1.0 Ethylene glycol distearate 2.0 Glycerin 4.0 1,3-butylene glycol 4.0 Methyl paraben 0.5 Perfume 0.05 Purification Water remaining

The above components were mixed in a conventional manner to obtain a face wash. This is a sample of Example 2. A face wash obtained by mixing using the same components except that betaine lauryl acetate was added instead of the amphoteric surfactant A was used in Comparative Example 2.
Sample. As a result of comparing the sensory characteristics at the time of use of these samples according to the above-described evaluation test (evaluation of burning feeling),
The number of persons who answered that there was no irritating sensation was 15 in the sample of Example 2 and 2 in the sample of Comparative Example 2.
In addition, as a result of comparing the sensory characteristics of these samples during use according to the above-described evaluation test (evaluation of refreshing feeling), the number of persons who answered that "there was no stickiness, but rather a refreshing feeling" was found in Example 2. The sample was 16 out of 20 persons and the sample of Comparative Example 2 was 2 out of 20 persons.

[0016]

As described above, the present invention can provide a cleansing cosmetic composition having no sticky feeling and having refreshing sensory characteristics. Further, the present invention can provide a cosmetic for washing containing an amphoteric surfactant which does not cause irritating discomfort such as burning.

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Claims (2)

[Claims] 1. A compound of the general formula (1) (Rx and Ry are hydrocarbon chains having 8 to 20 carbon atoms)
A cleansing cosmetic comprising the amphoteric surfactant represented by the formula: 2. The cleansing cosmetic according to claim 1, further comprising an anionic surfactant.