JP2001316216A - Cosmetic for sunburning makeup - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a cosmetic which is used for a sunburning makeup and can uniformly and rapidly change a skin in a sunburn colored one, when makeuped and whose active ingredient, dihydroxayacetone, is improved in stability and suppresses the coloration of the cosmetic containing it. SOLUTION: This lotion or gel-like cosmetic for use in sunburning makeup, characterized by comprising a dihydroxyacetone, an organic acid buffer solution and a nonionic polymer.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tanning cosmetic, and more particularly, to a tanning cosmetic capable of changing the skin to brown by external use and apparently keeping the skin tan. The aim is to improve the stability of the active ingredient, dihydroxyacetone, to suppress the coloring of the cosmetics, and when applied to the skin, the dyeing speed is fast and the skin has a spot-like color without spots on the skin. An object of the present invention is to provide a tanning cosmetic that can be colored.

[0002]

2. Description of the Related Art In recent years, harm to the human body due to ultraviolet rays has been called for. Generally, ultraviolet light is 200 nm to 400 n.
This is an electromagnetic wave having a wavelength of m, and ultraviolet rays having a wavelength shorter than about 290 nm are absorbed by the ozone layer, so that ultraviolet rays having a wavelength of about 290 nm to 400 nm reach the ground. Of these, exposure to ultraviolet light (UVB) having a wavelength of about 290 nm to 320 nm causes acute inflammation and burns on the skin, and exposure to ultraviolet light (UVA) having a wavelength of about 320 nm to 400 nm causes the base of the skin epidermis to be exposed. It is said that melanocytes in the cell layer are stimulated to promote the production of melanin pigment, which causes spots and freckles.

[0003] Furthermore, exposure to excessive ultraviolet rays for a long period of time causes the photoaging of the skin to proceed, which causes Fisherman's skin and skin cancer. Moreover, in recent years, the depletion of the ozone layer has progressed, and the amount of ultraviolet light falling on the ground has been increasing, especially in high-latitude regions. Excessive exposure to ultraviolet light is not desirable for beauty or health.

[0004] However, skin that has been tanned to tan is
BACKGROUND OF THE INVENTION Burning skin on a beach or the like in the summer is conventionally performed because it gives a healthy and active image.
Furthermore, in recent years, especially among young people, tanned skin has been favored throughout the four seasons, and in the winter season when tanning due to natural light cannot be expected, the number of people tanning at tanning salons and the like is increasing.

On the other hand, when α-hydroxyaldehyde or ketone such as dihydroxyacetone is applied to the skin, a Maillard reaction occurs with the amino acids and amino groups of skin keratin in the stratum corneum, and a yellow-brown to dark brown compound is formed on the epidermis It is known to form on the outer layer. In addition, the color once colored does not fade even after washing with water, and the coloration continues until the stratum corneum is completely exfoliated by skin turnover, so that it has a brownish skin as if it were sunburned be able to.

As described above, by using α-hydroxy aldehyde or ketone, it is possible to keep a necessary portion apparently tanned for a necessary period without exposure to harmful ultraviolet rays. Tanning-like cosmetics in various dosage forms such as lipsticks and lotions have been created. For example, JP-A-6-56629 discloses a sunburn-like cosmetic comprising dihydroxyacetone and an anionic silicone polyol. JP-A-6-56630 discloses a tanning cosmetic comprising dihydroxyacetone and polyacrylamide.

[0007]

However, in the conventional tanning cosmetics as described above, the stability of α-hydroxyaldehyde or ketone in the tanning cosmetics is not always good, and There has been a problem that the cosmetics themselves decompose to give significant coloring. For this reason, in practice, cosmetics in which the content of α-hydroxyaldehyde or ketone is as low as 2 to 4% are generally used, but in this case, the skin cannot be uniformly and sufficiently colored. Met.

[0008]

As described above, since dihydroxyacetone is decomposed with time and causes significant coloring of the cosmetic itself, attempts have been made to stabilize it by adjusting the pH. It has been reported that adjusting the pH to around 5 is suitable for stabilizing dihydroxyacetone (Farmaco 1983, 38, 415). However, in reality, the current situation is that the adjustment of pH alone cannot sufficiently suppress the decomposition of dihydroxyacetone (Cosmetics & Toletries magazine 1994, 109,
55). Attempts have been made to stabilize dihydroxyacetone with a buffer, but it has been reported that the addition of a buffer accelerates the decomposition of dihydroxyacetone (Cosmetics & Toletries magazine 1994, 109,
55). Therefore, as disclosed in JP-A-8-507542 and JP-A-11-12150, the use of an acid or a buffer is only added in an auxiliary manner for adjusting the pH. In view of such circumstances, the present inventors have conducted intensive studies and, as a result, when an organic acid buffer and a nonionic polymer are mixed with dihydroxyacetone, unlike the above report, the stability of dihydroxyacetone is excellent, and The present inventors have found that coloring is suppressed, the rate of dyeing on the skin is high, and that the skin can be uniformly and sufficiently colored. Thus, the present invention has been completed.

That is, the invention according to claim 1 relates to a lotion-like or gel-like suntan-like cosmetic comprising dihydroxyacetone, an organic acid buffer and a nonionic polymer. The invention according to claim 2 relates to the lotion-like or gel-like tanning cosmetic according to claim 1, wherein the organic acid buffer is a citrate buffer and / or an acetate buffer. The invention according to claim 3 relates to the lotion-like or gel-like tanning-like cosmetic according to claim 1 or 2, wherein the nonionic polymer is hydroxyethylcellulose and / or hydroxypropylmethylcellulose. The invention according to claim 4 relates to the lotion-like or gel-like tanning cosmetic according to any one of claims 1 to 3, characterized in that the cosmetic contains water and / or alcohol. The invention according to claim 5 relates to the lotion-like or gel-like tanning cosmetic according to any one of claims 1 to 4, wherein the pH is 4 to 6.9.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION The tanning cosmetic according to the present invention
In addition to dihydroxyacetone, an organic acid buffer and a nonionic polymer are blended. This is because the combination of the organic acid buffer and the nonionic polymer can enhance the stability of dihydroxyacetone. The amount of dihydroxyacetone is not particularly limited as long as it can change the skin to brown. However, if the amount is too small, the dyeing speed on the skin becomes slow and it is not practical. Even if it is added in an amount of more than 10% by weight, the practical dyeing speed does not change, so that it is preferably 1 to 10% by weight, more preferably 4 to 10% by weight in the tanning-like cosmetic. .

The organic acid used in the organic acid buffer, which is an essential component of the tanning cosmetic according to the present invention, is not particularly limited as long as it is blended in cosmetics.
Examples thereof include acetic acid, lactic acid, and malic acid, and it is preferable to use citric acid or acetic acid. The salt used for preparing the organic acid buffer is not particularly limited as long as it has the above-mentioned organic acid and a buffering action. Specifically, each salt such as sodium, potassium and ammonium is used. Can be used.

The amount of the organic acid buffer is not particularly limited as long as the stability of the dihydroxyacetone is maintained, but the amount of the organic acid buffer is adjusted so that the pH of the tanning cosmetic according to the present invention is 4 to 4.
It may be adjusted so as to be in the range of 6.9. This is
If H is less than 4, a problem of irritation to the skin at the time of use occurs,
This is because it is not preferable in terms of safety.

The nonionic polymer, which is the second essential component of the tanning cosmetic according to the present invention, can enhance the stability of dihydroxyacetone and increase the viscosity of the cosmetic, and can be used as a gel or gel cream. Tan-like cosmetics. In addition, since dihydroxyacetone reacts with amino acids and the like to show a color reaction, if it adheres to a portion other than the intended portion, it may cause dirt on clothes or stain the skin other than the intended portion, so that it may be used at the time of use. This is because it is important to increase the viscosity so as not to sag.
Further, by increasing the viscosity, dihydroxyacetone can be easily and uniformly applied on the skin.

When an ionic polymer is used as a thickening agent in the sunburn-like cosmetic according to the present invention, the influence of the pH thereof causes
It is preferable to use a nonionic water-soluble polymer because it causes a decrease in viscosity. The nonionic polymer used in the tanning cosmetic according to the present invention is not particularly limited as long as it does not affect the stability of dihydroxyacetone, and specifically, cellulosic, starch-based, and polyvinyl-based. And the like, and a nonionic water-soluble polymer such as a nonionic water-soluble polymer can be used. Specifically, examples of the cellulose-based polymer include methylcellulose, ethylcellulose, hydroxyethylcellulose, hydroxypropylcellulose, and hydroxypropylmethylcellulose. Of these, it is preferable to use hydroxyethylcellulose or hydroxypropylmethylcellulose.

The amount of the compound is 0.1 to
The content is preferably 2% by weight, more preferably 0.3 to 1% by weight. If the amount is less than 0.1% by weight, the thickening effect cannot be exerted, causing the problem of dripping. If the amount is more than 2% by weight, the thickener cannot be completely dissolved. Alternatively, the feeling of use is inferior because the sticky feeling peculiar to the polymer compound occurs, and in any case, it is not preferable.

Further, the sunburn-like cosmetic according to the present invention may contain alcohol. When blended, the blending amount is 1 to 50% by weight, preferably 5 to 30% by weight, and more preferably 1 to 50% by weight in the tanning cosmetic.
0 to 20% by weight. If the content is less than 1% by weight, the effect of the blending of the alcohol cannot be obtained, and if the content is more than 50% by weight, the thickener may be agglomerated when the thickener is blended. This is also not preferable. In the present invention, the alcohol means ethanol or isopropanol.

Further, in the tanning cosmetic according to the present invention, water (purified water) can be blended, and the blending amount is 50 to 99% by weight in the tanning cosmetic.

Further, the tanning cosmetic according to the present invention may contain, in addition to the components described above, a fragrance, a preservative, a chelating agent, a surfactant, a fatty acid, a fat and oil, as long as the stability is not impaired. Waxes, hydrocarbons, alkyl glyceryl ethers, esters, silicone oils, polyhydric alcohols, sugars,
Natural cosmetic ingredients such as amino acids, peptides, vitamins, ultraviolet absorbers, antioxidants, humectants and the like can be added.

[0019]

EXAMPLES Hereinafter, the present invention will be described in detail with reference to examples, but the present invention is not limited to these examples. In addition, the compounding amount is weight%.

Test Example 1 Stability of Dihydroxyacetone Samples of Examples 1 to 7 and Comparative Examples 1 to 3 were prepared according to the compositions shown in Table 1 below. Next, each prepared sample solution was stored at 40 ° C. for 8 weeks, and the stability of dihydroxyacetone in the solution after 1, 3, 6, 8 weeks was determined by the change in color of the sample solution as follows. . In addition, the buffer was prepared so that it might become the pH described using the buffer which consists of the sodium salt of the organic acid shown in the following Table 1. ：: colorless and transparent ○: slightly yellowish △: yellowish ×: brownish

The results are shown in Table 1.

[Table 1]

Test Example 2 Viscosity Stability Due to Addition of Nonionic Polymer Each sample of Examples 2 to 5 prepared above was stored under the conditions of Test Example 1, and an appropriate amount of each sample was taken. Was determined as follows. ◎: almost no decrease in viscosity is observed. 若干: slight decrease in viscosity is observed, but no dripping is observed. Δ: drastic drop in viscosity is caused and slight dripping is caused. X: almost no viscosity and dripping immediately.

The results are shown in Table 2.

[Table 2]

Test Example 3 Determination of Dihydroxyacetone The daily change of dihydroxyacetone in each of the sample solutions of Example 1 and Comparative Example 3 prepared above was quantified by HPLC. That is, 1 g of each of the above samples was precisely weighed, exactly 1 ml of the sample was made up to 100 ml with purified water, and the sample was further adjusted to 100 ml with purified water.

The results are shown in Table 3.

[Table 3]

Test Example 4 Dyeability of Sunburn-Like Cosmetic First, according to the compositions shown in Tables 4 and 5, Examples 8 to 1 were used.
Sunburn-like cosmetics of Comparative Examples 0 and 4 to 6 were prepared. still,
The amount of dihydroxyacetone is as shown in Table 6 below.

[0027]

[Table 4]

[0028]

[Table 5]

Next, 0.1 g of each of the prepared samples of Examples 8 to 10 and Comparative Examples 4 to 6 was applied to the upper arm of a panel of three men and women in a range of 5 cm × 5 cm. The dyeing effect of the coated part was determined according to the following criteria. For the judgment, the average value of each panel was adopted. ：: High dyeing power (dyeing uniformly and uniformly) ○: Slightly poor dyeing power (uniformly dyed, but with some unevenness) ×: Poor dyeing power (non-uniform dyeing, Inferior coloring power)

The results are shown in Table 6.

[Table 6]

From the results of Tables 1 to 3 and 6, the tanning cosmetic according to the present invention is excellent in stability of dihydroxyacetone by adding an organic acid buffer as an essential component to dihydroxyacetone, It can be seen that the dyeing speed on the skin is high, and that the skin can be uniformly and sufficiently colored.

The following is an example of the formulation of the sunburn-like cosmetic according to the present invention. (Prescription example 1)

[Table 7]

(Formulation Example 2)

[Table 8]

[0034]

As described in detail above, the sunburn-like cosmetic according to the present invention is excellent in stability of dihydroxyacetone by blending an organic acid buffer and a nonionic polymer with dihydroxyacetone, and While suppressing coloring,
The dyeing rate on the skin is high, and the skin can be uniformly and sufficiently colored.

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Shigeru Fujibayashi 5-12, 12 Kencho-cho, Chuo-ku, Osaka City Inside Mandom Central Research Laboratory Co., Ltd. (72) Inventor Makoto Shimoura 2-14-1, Akasaka, Minato-ku, Tokyo Within Creation Arcos Co., Ltd. (72) Inventor Akio Tachikawa 2-14-1, Akasaka, Minato-ku, Tokyo F-term within Creation Arcos Co., Ltd. 4C083 AB051 AC101 AC102 AC122 AC211 AC212 AC231 AC271 AC272 AC301 AC302 AC432 AC482 AD281 AD282 BB32 BB44 CC04 DD22 DD41 EE01 EE06 EE11

Claims (5)

[Claims] 1. A lotion-like or gel-like tanning cosmetic comprising dihydroxyacetone, an organic acid buffer and a nonionic polymer. 2. The lotion-like or gel-like tanning cosmetic according to claim 1, wherein the organic acid buffer is a citrate buffer and / or an acetate buffer. 3. The lotion-like or gel-like tanning cosmetic according to claim 1, wherein the nonionic polymer is hydroxyethylcellulose and / or hydroxypropylmethylcellulose. 4. A lotion-like or gel-like tanning cosmetic according to claim 1, wherein the cosmetic comprises water and / or alcohol. 5. The lotion-like or gel-like tanning cosmetic according to claim 1, wherein the pH is 4 to 6.9.