JPH1149632A - Cosmetic - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain the subject cosmetic improved in feeling in use, usable in a side range of pH, excellent in safety to skin, by including a specific anionic surfactant. SOLUTION: This cosmetic contains preferably 0.01-50 wt.% based on the total amount of an anionic surfactant of formula I (R is a 7-17C hydrocarbon chain; (m) is 2-6; (n) is 1-6; (p) is 1-10; X is H, etc.; AO is an alkylene oxide). The compound of formula I is obtained by reacting a compound of formula II with a compound of the formula RCOCl, reacting the obtained compound of formula III with a compound of the formula Cl(CH2 )p COOH. The cosmetic containing the anionic surfactant has more excellent gelatinizing ability (water retention), functional characteristics, (compatibility and spread), skin stimulation, etc., than conventional one mixed with an anionic surfactant.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to a cosmetic containing an anionic surfactant useful as a base, a cleansing agent, an emulsifier, and a conditioning agent for hair and skin cosmetics.

[0002]

2. Description of the Related Art Conventionally, (a) salts comprising a sulfuric acid ester of an aliphatic higher alcohol, a phosphoric acid ester of an aliphatic higher alcohol, N-long-chain acylglutamic acid and a basic substance such as caustic soda, caustic potash and triethanolamine. Anionic surfactants, (ii) ether-type nonionic surfactants such as ethylene oxide adducts of aliphatic higher alcohols, and (iii) ester-type nonionic surfactants comprising higher fatty acids and polyhydric alcohols. Skin cosmetics containing emulsifier as a main component are known. These were not sufficient in terms of the most important organoleptic properties and skin safety as cosmetics. On the other hand, in recent years, hair and skin cosmetic bases, cleaning agents,
Anionic surfactants having two hydrophobic groups and two polar groups in a molecule useful as emulsifiers and conditioning agents have become known. In addition, it has been known that when incorporated into cosmetics, it has excellent storage stability, sensory characteristics (moisturizing properties), and safety on the skin (Japanese Patent Laid-Open No. 9-293).
No. 1). However, when examined in detail, there is no one that satisfactorily satisfies the points of, for example, sensory properties (fit-in, elongation), gelling ability (water retention), pH range usable as a system, and skin irritation. Improvement was desired.

[0003]

The problem to be solved by the present invention is to develop a cosmetic composition which is excellent in sensory characteristics (fitting, elongation), a wide range of pH usable as a system, and excellent skin safety. It is.

[0004]

Means for Solving the Problems The present inventors have conducted intensive studies in view of the above circumstances, and as a result, the following specific cosmetics have sensory characteristics (fitting, elongation) and a wide range of pH usable as a system. And found that the skin was excellent in safety, and completed the present invention.

That is, claim 1 of the present invention is a general formula

[0006]

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Wherein R is a hydrocarbon chain having 7 to 17 carbon atoms, m is an integer of 2 to 6, n is 1 to 6, p is an integer of 1 to 10, and X is hydrogen. An atom or a monovalent or divalent alkali metal ion, an alkaline earth metal ion, an ammonium ion or an organic ammonium ion;
O is an alkylene oxide), which is a cosmetic containing an anionic surfactant represented by the formula: Further, claim 2 of the present invention is a general formula

[0008]

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Wherein R is a hydrocarbon chain having 7 to 17 carbon atoms, m is 2, n is 1 to 4, p is 2 to 8, and X is a hydrogen atom or monovalent or bivalent. AO is an alkali metal ion, an alkaline earth metal ion, an ammonium ion or an organic ammonium ion, and AO is an alkylene oxide). Further, claim 3 of the present invention provides a compound represented by the general formula:

[0010]

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Wherein R is a hydrocarbon chain having 7 to 17 carbon atoms, m is 2, n is 1 to 4, p is 2 or 3, and X is a hydrogen atom or monovalent or divalent. AO is an alkali metal ion, an alkaline earth metal ion, an ammonium ion or an organic ammonium ion, and AO is an alkylene oxide).

[0012]

Next, the configuration of the present invention will be described.

The anionic surfactant according to the present invention can be synthesized, for example, according to the reaction scheme of Chemical formula 7.

[0014]

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The anionic surfactant according to the present invention has the following molecular structure. The carbon number of the long-chain hydrocarbon group R is 7 to
17 are applied, and as surfactants, especially 11, 1
3 is preferred. The hydrocarbon chain (m) of the spacer has 2 to 6 carbon atoms, and 2 is particularly preferable. If it exceeds 6, the performance as a surfactant decreases. Those having 2 or 3 carbon atoms per unit of the alkylene oxide chain (ethylene oxide or propylene oxide) are arbitrarily selected, and the average chain length n is 1 to 6. Especially preferably, it is 1-4. If it exceeds 6, the organoleptic properties deteriorate. The length of the polyalkylene chain between the end of the alkylene oxide chain and the carboxyl group is important in terms of functional properties. In the present invention, the number of methylene groups is usually 1 to 10, and if it exceeds 10, the functional properties are reduced. Preferably it is 2-8, especially preferably 2-3. The counter ion X is appropriately selected from one or more of a hydrogen atom, a monovalent or divalent alkali metal ion, an alkaline earth metal ion, an ammonium ion or an organic ammonium ion. The cosmetic of the present invention containing such an anionic surfactant has a gelling ability (water-holding property), a sensory characteristic (compatibility, elongation), and a skin more than those of a conventionally known anionic surfactant. It is characterized by being excellent in irritation and a wide range of pH usable as a system. The content is preferably from 0.01 to 50% by weight, particularly preferably from 1 to 20% by weight, based on the total amount of the cosmetic (composition).

The cosmetics of the present invention mean cosmetics for the skin and hair (including those for cleaning) in general. For example, skin milk, skin cream, foundation cream,
Basic cosmetics such as massage creams, cleansing materials, makeup removers, face-wash creams, lotions, scalp treatments, hair creams, hair shampoos, and hair rinses, makeup cosmetics, and hair cosmetics.

[0017]

The present invention will be described below with reference to examples. The test methods for sensory properties described in the examples are shown below.

Skin irritation After 20 consecutive female panelists used for one week, the presence or absence of skin irritation (hereinafter abbreviated as irritation) was evaluated according to the following criteria. Usability After the use of 20 female panelists for one week in a row, the usability (fitness, growth) was evaluated according to the following criteria.

Examples 1 to 8 and Comparative Example 1 [Skin milk] Various emulsifier components were blended as shown in Tables 1 and 2, and various raw materials were blended as shown in Table 3. Example skin milks were prepared and tested for properties.

[0020]

[Table 1]

[0021]

[Table 2]

(1) Composition

[0023]

[Table 3]

(2) Preparation Method The components (a) and (b) are each uniformly dissolved at a temperature of 80 ° C., and after the component (a) is stirred, the component (b) is injected and emulsified and dispersed. Prepare by cooling to a temperature of 30 ° C. with stirring. (3) Characteristics Tables 1 and 2 show the results of testing the characteristics of each example and comparative example.
It describes in. From these results, the skin milk of the present invention
It is clear that the skin safety and the feeling of use are superior to those of the comparative example. It should be noted that, when the number of alkylene chains between the terminal of the ethylene oxide chain and the carboxyl group is one (methylene) and two or more, those having two or more are suitable in terms of skin safety and usability. However, the longer the alkylene chain, the more sticky feeling, and as a result, the feeling of use was slightly reduced. The skin milks of Examples 1 to 8 have a pH of
Was adjusted over a wide range of 6 to 9, the storage stability was excellent. On the other hand, that of Comparative Example 1 was excellent in storage stability only at around pH 10.

[0025]

As described above, it is apparent that the present invention provides a cosmetic composition which is excellent in sensory characteristics (fitting and elongation), has a wide pH range usable as a system, and is excellent in skin safety.

Claims (3)

[Claims] 1. A compound of the general formula (Wherein, R is a hydrocarbon chain having 7 to 17 carbon atoms, m is 2 to 6
N is 1 to 6, p is an integer of 1 to 10, and X is a hydrogen atom or a monovalent or divalent alkali metal ion, alkaline earth metal ion, ammonium ion or organic ammonium ion. Wherein AO is an alkylene oxide). 2. A compound of the general formula (Wherein, R is a hydrocarbon chain having 7 to 17 carbon atoms, m is 2, n is an integer of 1 to 4, p is 2 to 8, and X is a hydrogen atom or monovalent or divalent.) Which is an alkali metal ion, an alkaline earth metal ion, an ammonium ion or an organic ammonium ion, and AO is an alkylene oxide). 3. A compound of the general formula (Wherein, R is a hydrocarbon chain having 7 to 17 carbon atoms, m is 2, n is 1 to 4, p is 2 or 3, X is a hydrogen atom or a monovalent or divalent alkali. A metal ion, an alkaline earth metal ion, an ammonium ion or an organic ammonium ion, and AO is an alkylene oxide)
A cosmetic comprising an anionic surfactant represented by the formula: