JPH11335258A - Cosmetic - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a cosmetic having excellent utility, safety and antiseptic, useful for lotions, milky lotions, creams, etc., of skin cosmetic, foundations of makeup cosmetic, etc., by including pentanediol and butylene glycol. SOLUTION: This cosmetic contains (A) 1,2-pentanediol and (B) 1,3-butylene glycol in the ratio of preferably 0.5-20 wt.% of the component A and 0.5-20 wt.% of the component B, more preferably 1-10 wt.% of the component A and 0.5-15 wt.% of the component B. This cosmetic is useful for packs, jellies, liquid cosmetics, shampoos of hair cosmetic, rinses, hair growing cosmetics, etc.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cosmetic having excellent usability, safety and preservability.

[0002]

2. Description of the Related Art In general, preservatives and polyhydric alcohols are incorporated into cosmetics for the purpose of ensuring preservative and antifungal properties and improving preservability. Examples of preservatives in typical cosmetics include paraoxybenzoic acid esters (commonly called parabens) and 2-phenoxyethanol, and examples of polyhydric alcohols include 1,3-butylene glycol and dipropylene glycol. Can be. The parabens and 2-phenoxyethanol may be accompanied by a feeling of irritation during use in cosmetics. In addition, when a polyhydric alcohol is added to a cosmetic in a high content in order to ensure antiseptic and antifungal properties, there is a tendency that a irritating feeling is caused at the time of use, or the usability tends to be impaired.

[0003]

SUMMARY OF THE INVENTION 1,2-Pentanediol is blended as a base component of cosmetics to exhibit a moisturizing effect. Further, it has been proposed that a composition for external use containing 1,2-pentanediol and 2-phenoxyethanol is effective in ensuring the preservative property (Japanese Patent Application Laid-Open No. HEI 1-1990).
0-53510). However, even if 1,2-pentanediol was used alone or in combination with other components, it did not reach an effect as a cosmetic.

Accordingly, the present invention has made intensive studies in view of the above problems, and as a result, it has been found that, as compared with the case where 1,3-butylene glycol is blended alone, the antiseptic property is remarkably improved, and the safety and usability are excellent. An object of the present invention is to provide cosmetics and solve the above-mentioned problems.

[0005]

That is, the present invention provides a cosmetic composition having excellent usability, safety and preservative properties.
A cosmetic was prepared by blending pentanediol and 1,3-butylene glycol.

[0006]

Embodiments of the present invention will be described below in detail. 1,2-pentanediol used in the present invention is a known substance as a kind of dihydric aliphatic alcohol,
It has the following properties. Molecular weight: 104 Molecular formula: C ↓ 5H ↓ 12O ↓ 2 Appearance: Colorless and transparent liquid This substance is used in cosmetics as a moisturizing ingredient,
Although it is easily available and can be incorporated into the cosmetic of the present invention, it is also possible to incorporate a compound synthesized by a known method into the cosmetic.

[0007] The 1,3-butylene glycol compounded in the cosmetic of the present invention together with the 1,2-pentanediol has the following properties. Molecular weight: 90.12 Molecular formula: C4H10O2 Appearance: Colorless transparent viscous liquid Boiling point: 207.5 ° C. Specific gravity: 1.004 to 1.007 This substance is a component that is usually blended in cosmetics as a humectant. is there.

[0008] The amount of the 1,2-pentanediol is 0.5% in order to exert the desired antibacterial effect.
-20% by weight is generally preferred, with 1-10% by weight being particularly preferred. The amount of 1,3-butylene glycol is generally 0.5 to 20% by weight. If the content is more than 15% by weight, the feeling of use becomes sticky, which is not preferable.

When the amounts of the two components are within the above ranges, the desired effects of the present invention can be obtained. As mentioned above,
By combining 1,2-pentanediol and 1,3-butylene glycol in combination, the cosmetics of the present invention having excellent usability and safety can be provided while preserving antiseptic properties.

[0010] The present invention can be widely applied to cosmetics, quasi-drugs and the like. For example, it can be applied to lotions, emulsions, creams, packs, gels, serums, and the like of skin cosmetics. Furthermore, it can be widely applied to various dosage forms such as foundations for makeup cosmetics, shampoos, rinses, and hair restoration cosmetics for hair cosmetics. Similarly, quasi-drugs can be applied to a wide range of dosage forms such as aqueous, emulsified, and solubilized systems. In addition, the cosmetics of the present invention may optionally contain, in addition to the above, dyes, fragrances, preservatives, surfactants, pigments, antioxidants, and the like, as long as the object of the present invention is achieved.

[0011]

Next, the present invention will be described in detail based on examples and comparative examples. The use test and antiseptic test used in the present invention are as follows.

[Use test] The cosmetics of the present invention and the cosmetics of the comparative examples were applied to 20 female subjects (35 to 55 years old) with sensitive skin who are liable to cause skin troubles due to changes in cosmetics, chemical substances and external environment. The skin was used twice a day (morning / evening) for one continuous week to evaluate skin irritation and feeling of use. The skin irritation of the test results is indicated by the number of people who complained of skin irritation, and the feeling of use was moisturized, smooth, and smooth, for each item of skin wettability, smoothness, and elasticity. The number of respondents who indicated that skin tension occurred was indicated.

[Preservative test] After inoculating a bacterial solution to 20 g of a sample, a change in the number of bacteria was examined by a pour method. The inoculated bacteria were evaluated for their antiseptic activity by a change in the number of bacteria using bacteria and fungi by 4 weeks, and the obtained results were classified into the following three criteria. In addition, among the following classifications, those of ◎ or ○ were judged to be acceptable.

A: A remarkable decrease in the number of bacteria is observed. ：: A decrease in the number of bacteria is observed. ×: The number of bacteria hardly decreases or the number of bacteria hardly decreases.

Comparative Examples 1 to 8 and Examples 1 to 10
Cosmetic liquids having the compositions described, Comparative Examples 1 to 8 and cosmetic liquids described in Table 2 and Examples 1 to 10 were each prepared according to a conventional method, and the above tests were carried out. The results are shown in Tables 3 and 4. I do.

[0016]

[Table 1]

[0017]

[Table 2]

[0018]

[Table 3]

[0019]

[Table 4]

From these results, it can be seen that the cosmetic liquid of Comparative Example 1, which is a basic cosmetic liquid, contains only 1,2-pentanediol and 1,3-butylene glycol alone, ie, Comparative Examples 2 to 8. 1,2-pentanediol and 1,3
-A cosmetic liquid combined with butylene glycol,
That is, Examples 1 to 10 showed low irritation in the skin irritation test, high evaluation in the usability test, and high antiseptic effect in the antiseptic test.

[Comparative Examples 9 to 16 and Examples 11 to 20]
Emulsions having the compositions shown in Table 5 and Comparative Examples 9 to 16 and Emulsions shown in Table 6 and Examples 11 to 20 were respectively prepared according to a conventional method, and the above tests were carried out. The results are shown in Tables 7 and 8. .

[0022]

[Table 5]

[0023]

[Table 6]

[0023]

[Table 7]

[0024]

[Table 8]

From these results, it can be seen that the emulsion of the basic comparative example 9 was prepared by independently mixing 1,2-pentanediol and 1,3-butylene glycol. 2-pentanediol and 1,3
-An emulsion containing a combination of butylene glycol, that is, Examples 11 to 20 showed low irritation in skin irritation test, high evaluation in usability test, and high antiseptic effect in antiseptic test. Was.

[0026]

As described above, the present invention can provide a cosmetic having excellent usability, safety and preservability.

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Naomi Sato 1611-1, So, Odawara-shi, Kanagawa

Claims (1)

[Claims] 1. A cosmetic comprising 1,2-pentanediol and 1,3-butylene glycol.