JPH07101843A - Self-tanning cosmetic - Google Patents

Abstract

PURPOSE:To provide a self-tanning agent good in acclimation to the skin and capable of evenly pigmenting the skin, using a water-based base or a solubilized emulsified base of low oil content. CONSTITUTION:A self-tanning cosmetic formulated with dihydroxyacetone is formulated with a polyoxyethylene-polyoxypropylene block polymer-type surfactant <10wt.% in oil content to obtain the objective self-tanning cosmetic.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a self-tanning cosmetic composition containing dihydroxyacetone, which is well-known to the skin by using an aqueous base or a solubilizing or emulsifying base having a low oil content. , A self-tanning cosmetic that colors the skin without "uniformity".

[0002]

2. Description of the Related Art Self-tanning cosmetics containing dihydroxyacetone (hereinafter abbreviated as DHA) have the purpose of coloring the skin in a tan color without being exposed to sunlight (ultraviolet rays). Products are on sale from various companies. Due to the nature of these products, it is common to use emulsions such as creams from the viewpoint of uneven coloring unless they are evenly applied to the skin, and the stability of the product system when DHA is incorporated. Met. On the other hand, from the viewpoint of coloring to the skin, the smaller the oil content, the faster the coloring to the skin. However, oil-free aqueous bases and low-oil content emulsified bases have poor compatibility with the skin and are difficult to apply uniformly, resulting in uneven coloring of the skin and a self-tanning finish. Feeling is extremely impaired. Therefore, these bases were not suitable as a base for compounding DHA, although they quickly colored the skin and had good usability.

[0003]

DISCLOSURE OF THE INVENTION The present invention solves the above-mentioned drawbacks of the prior art by using an oil-free aqueous base or a low oil content emulsified base, without causing uneven coloring on the skin. The purpose is to provide a self-tanning cosmetic with a beautiful tanning finish.

[0004]

DISCLOSURE OF THE INVENTION As a result of earnest research in view of the above-mentioned prior art, the inventors of the present invention have found that a specific surfactant in an aqueous base containing no oil or a low oil content emulsion base. It was found that the blending of (1) with (3) does not cause uneven coloring and beautiful self-tanning is achieved, and the present invention has been completed. That is, the present invention is characterized in that, in a self-tanning cosmetic composition containing DHA, the oil content is less than 10% and a polyoxyethylene-polyoxypropylene block polymer type surfactant is compounded. Tanning cosmetics. Hereinafter, the configuration of the present invention will be described in detail.

The DHA used in the present invention is generally used for self-tanning cosmetics, and its blending amount is about 1 to 10% by weight based on the total amount of self-tanning cosmetics due to its coloring property on the skin. It is common. The base to which the present invention can be applied is an aqueous base that does not substantially contain oil or an emulsion base having a low oil content. In the case of an emulsification base, those with an oil content of less than 10% are targeted. It is effective when it is 5% or less. The emulsified base having an oil content of 10% or more can be well adapted to the skin even by the conventional technique, and it is not necessary to add a polyoxyethylene-polyoxypropylene block polymer type surfactant. Examples of the polyoxyethylene-polyoxypropylene block polymer type surfactant used in the present invention include those commercially available under the trade name Pluronic and Tetronic from Asahi Denka Kogyo Co., Ltd. and BASF. These include various grades depending on the number of moles of polyoxyethylene and polyoxypropylene added, but are not particularly limited as long as they can be dissolved in the above-mentioned base. The blending amount is 0.1 to 3% by weight, preferably 0.5 to 2 based on the total amount of the self-tanning cosmetic.
% By weight. If the blending amount is less than 0.1% by weight, it is not possible to improve the "familiarity" to the skin, and in order to improve the "familiarity" to the skin, a blending amount of up to 3% by weight is sufficient. It is not necessary to mix beyond this. In the self-tanning cosmetic of the present invention, a moisturizer, a surfactant, an ultraviolet absorber, a drug, a coloring agent, a powder, a fragrance, etc. which are generally used in cosmetics, as long as the effects and quality of the present invention are not impaired. Can be blended.

[0006]

EXAMPLES Next, the present invention will be described in more detail by way of examples, which should not be construed as limiting the invention. <Example 1> Self-tanning lotion (prescription) Part A Ethyl alcohol 5% Vitamin E acetate 0.05 POE (60) hydrogenated castor oil 12-Humanoxy 4-methoxybenzofenone 0.2 Paraben 0.2 Perfume 0.02 B Part DHA 5% dl-α-tocopherol 2-L-ascorbic acid phosphoric acid diester potassium salt 0.1 glycerin 2 1,3 butylene glycol 2 Pluronic L-621 1 {manufactured by Asahi Denka Kogyo} Xanthan gum 0.2 edet Disodium acid 0.1 Ion-exchanged water Residual (production method) Disodium edetate and DHA are dissolved in ion-exchanged water in Part B, and xanthan gum moistened with glycerin and 1,3 butylene glycol is added. The components of Part A are thoroughly dissolved and added to Part B to obtain a self-tanning lotion.

<Example 2> Self-tanning emulsion (formulation) A part Squalane 2 POE (60) Glyceryl monoisostearate 1 Glyceryl monostearate 1 Butylparaben 0.2 Perfume 0.1 B part 1,3 Butylene glycol 5 DHA 3 Pluronic L-642 (manufactured by Asahi Denka Kogyo Co., Ltd.) Hydroxyethyl cellulose 0.2 Sodium citrate 0.1 Sodium hexametaphosphate 0.1 Ion-exchanged water Residue (production method) Sodium citrate in ion-exchanged water in part B , Sodium hexametaphosphate, and DHA, Pluronic L
Add -64 to dissolve completely. Add hydroxyethyl cellulose moistened with 1,3 butylene glycol and heat. The components of Part A are sufficiently dissolved, heated, added to Part B and emulsified. This is cooled to obtain a self-tanning emulsion.

<Test Example 1> The self-tanning lotion of Example 1 and the self-tanning lotion obtained by removing Pluronic L-62 from Example 1 (Comparative Example 1) were applied to the right arm and left arm of each subject and applied to the skin. The familiarity with and the coloring state were evaluated. Table 1 shows the evaluation results by 20 test subjects. [Evaluation Criteria] Familiarity with the skin Colored state : Good familiarity ○: Uniformly colored Δ: Normal Δ: Somewhat uneven x: Not well-fitted ×: Uneven [Table 1] ───── ───────────────────── Evaluation item Evaluation Example 1 Comparative example 1 ───────────────────── ────── Familiarity with the skin ○ 15 people 5 people △ 4 11 × 14 14 ────────────────────────── Coloring Condition ○ 17 3 △ 3 12 × 0 5 ───────────────────────────

[0009]

EFFECTS OF THE INVENTION The self-tanning cosmetic of the present invention is capable of quickly coloring the skin, having good "familiarity" with the skin, and being less likely to cause uneven coloring.

Claims (1)

[Claims] 1. A self-tanning cosmetic composition containing dihydroxyacetone, wherein the oil content is less than 10% and a polyoxyethylene-polyoxypropylene block polymer type surfactant is compounded. Cosmetics.