JP2589761B2 - Cosmetic additives - Google Patents

Description

The present invention relates to a cosmetic additive containing a stable ascorbic acid derivative as an active ingredient.

[Conventional technology and issues]

Although various effects of ascorbic acid are known, it is involved in collagen biosynthesis as an effect on the skin (Ha
ns Von Euler et al., Basics of Reductone Chemistry and Biochemical Results of Vitamin C, Uchida Lao Tsuruho Shinsha (1960) and Toshihiko Suematsu,
Vitamin C Utility, Health Research Institute (1987) Maintains a firm and fresh state and suppresses the production of melanin pigments that cause spots and freckles. (Suematsu Toshihiko, Vitamin C Utility 1987) and Ichikawa et al., Shinkin, March Issue, 372 (1969)) are known to have an effect of maintaining a beautiful skin condition, and are suitable as medicinal agents in the cosmetics field. However, ascorbic acid is very unstable due to a strong reducing substance, and various ascorbic acid derivatives have been developed for stabilization. Among them, L-ascorbic acid-2-phosphate or a salt thereof ( (Hereinafter referred to as AP) is the most excellent ascorbic acid derivative in terms of stability, safety and action effect on the skin, etc., and has been used in aqueous cosmetics such as lotions, essences and packs today. However, when this AP is incorporated into emulsified cosmetics such as milky lotions and creams, it may separate into an oil phase and an aqueous phase,
Conversely, the functionality and stability of cosmetics such as hardening and the like are impaired, and application to emulsified cosmetics is extremely difficult.

Under these circumstances, the present inventors have conducted intensive studies to obtain an emulsified composition in which an ascorbic acid derivative is stably blended. As a result, AP and saclodextrin (hereinafter referred to as CD) were obtained.
It has been found that an emulsified composition containing satisfies the functionality and stability as cosmetics, and has led to the present invention.

[Configuration of the invention]

That is, the present invention provides an additive to an emulsified cosmetic product comprising AP and CD.

The emulsified composition containing this AP and CD is extremely stable and has a good feeling of use, and fully satisfies the functionality as cosmetics.
In addition, ascorbic acid exerts a very good effect on skin beautification due to its effectiveness on the skin.

The AP salts used in the present invention are Na, K, Mg or Ca salts, and any of α, β and γ types of CD may be used. Among them, β type is most preferable.
Although there is no strict regulation on the ratio of AP: CD,
0.3 to 2 parts by weight of CD is appropriate for 1 part by weight of P.

The amount added to cosmetics varies depending on the subject, and cannot always be specified unconditionally, for example, during the formulation of an emulsion composition,
It is 0.1 to 10% by weight as CD, preferably 1 to 5% by weight.

Hereinafter, typical examples will be described, but the present invention is not limited to these examples.

-Example 1 (cream) The above components (A) and (B) are each heated to 80 ° C., then mixed and stirred. After cooling to 50 ° C., the component (C) was added and further stirred and mixed to prepare a uniform cream.

Note *: Kyoei Chemical Industry Co., Ltd., same as below. ・ Example 2 (Emulsion) The above components (A) and (B) are each heated to 80 ° C., then mixed and stirred. After cooling to 50 ° C., the component (C) was added and further stirred and mixed to prepare a uniform emulsion.

〔The invention's effect〕

Next, Examples 1 and 2 of emulsified compositions containing AP
A comparative test was carried out on the stability and functionality as a cosmetic using the creams and emulsions prepared in Comparative Examples described below.

(1) Stability test The stability of the creams and emulsions prepared in Examples 1 and 2 as cosmetics was prepared in Comparative Examples 1 and 2 below.
Creams and emulsions containing no CD were prepared, and the appearance after two weeks at 40 ° C. (constant temperature) was compared and observed.

 The results are shown in Table 1.

Comparative Example 1 (Cream) A cream was prepared in the same manner as in Example 1 except that glyceryl monostearate was used instead of CD (β-type).

Comparative Example 2 (Emulsion) An emulsion was prepared in the same manner as in Example 2 except that glyceryl monostearate was used instead of CD (β-type).

(2) Functionality test Regarding the functionalities of the creams and emulsions prepared in Examples 1 and 2 as cosmetics, the following Comparative Examples 3 and 4 in which the emulsification system was stabilized only with a surfactant without adding CD. A cream emulsion was prepared and monitored for the following:

-Comparative example 3 (cream) The above components (A) and (B) are each heated to 80 ° C., then mixed and stirred. After cooling to 50 ° C., the component (C) was added and further stirred and mixed to prepare a uniform cream.

-Comparative example 4 (emulsion) The above components (A) and (B) are each heated to 80 ° C., then mixed and stirred. After cooling to 50 ° C., the component (C) was added and further stirred and mixed to prepare a uniform emulsion.

The test monitor was selected from 50 randomly selected women aged 18 to 53 years. The results are shown in Table 2.

(Expansion at the time of use) (skin familiarity) A: very good E: very good B: good F: good C: normal G: normal D: bad H: bad (stickiness after use) I: totally I do not feel it J: I do not feel much K: Normal L: I feel very much In the course of the monitor test, no one complained of abnormalities on the skin.

(3) Microscopy Observation In order to compare and observe the emulsions of the creams prepared in Example 1 and Comparative Example 3, a small amount of each cream was placed on a slide glass, covered with a cover glass, and gently pressed down. (600 times)
Was observed. The results are shown in Table 3.

From the above results, it can be seen that the emulsified composition containing the AP and the CD according to the present invention is more excellent in stability and functionality as a cosmetic than the AP-containing emulsified composition prepared only with a conventional surfactant. I found it. These facts could also be confirmed from the results of microscopic observation. Further, they have found that it is possible to easily prepare an emulsified composition containing AP, which has been conventionally difficult, and reached the present invention.

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Claims (1)

(57) [Claims] 1. A cosmetic additive comprising L-ascorbic acid-2-phosphate or a salt thereof and cyclodextrin as active ingredients.