JPH05345714A - Skin cosmetic - Google Patents

Abstract

PURPOSE:To provide a skin cosmetic having excellent beautifying effect on skin, high moisture-retention and excellent stability of quality. CONSTITUTION:The skin cosmetic contains an inorganic acid ester salt of L- ascorbic acid, xanthane gum and sodium hyaluronate. The amount of the inorganic acid ester salt of L-ascorbic acid is preferably 0.001-10wt.%, especially 0.01-5wt.% based on the total cosmetic. Both xanthane gum and sodium hyaluronate are polysaccharides and the sum of the components is preferably 0.001-10wt.%, especially 0.01-5wt.% based on the total cosmetic.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a skin cosmetic having an excellent whitening effect on the skin, a high moisturizing effect, and a high quality stability.

[0002]

BACKGROUND OF THE INVENTION L-Ascorbic acid is widely known as a substance having a whitening effect, since it has effects such as suppression of melanin production and light color bleaching action of the produced melanin. There is a drawback that the whitening effect is not always sufficient because the stability is very poor.

Various L-ascorbic acid derivatives have been developed in order to improve the stability of L-ascorbic acid, and in recent years, L-ascorbic acid-2-phosphate and L-ascorbic acid have been developed.
Inorganic acid ester salts of L-ascorbic acid such as ascorbic acid-2-sulfate are used in skin cosmetics (JP-A-3-109308, JP-A-3-275610, JP-A-4-275610). Bulletin).

On the other hand, a water-soluble polymer has a high water-retaining property, and is therefore incorporated into cosmetics for the purpose of enhancing the moisturizing effect. In addition, it is utilized to improve the stability of emulsions and to create unique and unique dosage forms by taking advantage of its viscosity characteristics.

A water-soluble polymer is added to skin cosmetics containing L-ascorbic acid for the purpose of improving the stability (Japanese Patent Laid-Open No. 60-116618 and Japanese Patent Laid-Open No. 4-77409).
Publication). However, it was revealed by detailed examination that the whitening effect and the moisturizing effect are not always sufficient.

As a result of intensive studies in view of such circumstances, the present inventors have found that, surprisingly, the skin cosmetic composition described later has an excellent whitening effect on the skin and a moisturizing effect due to a synergistic effect. The inventors have found that not only the cost is high but also the stability in terms of quality, and have completed the present invention.

The object of the present invention is to have an excellent whitening effect,
Another object of the present invention is to provide a skin cosmetic having a high moisturizing effect and excellent stability.

[0008]

Means for Solving the Problems The present invention which achieves the above object is a skin cosmetic characterized by containing an inorganic acid ester salt of L-ascorbic acid, xanthan gum and sodium hyaluronate.

The structure of the present invention will be described in detail below. The inorganic acid ester salt of L-ascorbic acid used in the present invention includes L-ascorbyl-2-phosphate sodium, L-ascorbyl-2-magnesium phosphate, L-
Ascorbyl-2-phosphate potassium, L-ascorbyl-2-phosphate calcium, L-ascorbyl-2-sodium sulfate, L-ascorbyl-2-magnesium sulfate, L-ascorbyl-2-potassium sulfate and L-ascorbyl-2-sulfate Examples include calcium but are not limited thereto. These inorganic acid ester salts of L-ascorbic acid are used alone or in combination of two or more.

Among the inorganic acid ester salts of L-ascorbic acid, sodium L-ascorbyl-2-phosphate,
Especially preferable results are obtained when L-ascorbyl-2-magnesium phosphate and L-ascorbyl-2-sodium sulfate are blended with cosmetics together with carrageenan and sodium hyaluronate.

The amount of the inorganic acid ester salt of L-ascorbic acid incorporated into the cosmetic is 0.001 to 10 based on the total amount of the cosmetic.
Wt% is preferred, more preferably 0.01-5 wt%
Is. If it is less than 0.001% by weight, it is difficult to obtain a whitening effect, and if it exceeds 10% by weight, odor, discoloration or precipitation tends to occur, which is not preferable.

Xanthan gum and sodium hyaluronate used in the present invention are both polysaccharides, and their blending amount is 0.001-1 in total in the total amount of the cosmetic.
It is preferably 0% by weight, more preferably 0.01 to 5% by weight. If it is less than 0.001% by weight, odor, discoloration or precipitation is likely to occur, and if it exceeds 10% by weight, it is not preferable because it has poor sensory properties such as stickiness.

The blending weight ratio of xanthan gum and sodium hyaluronate to the cosmetic of the present invention is 12: 1 to 1: 1.
12 is preferable, and 10: 1 to 1:10 is more preferable.

In the cosmetic of the present invention, in addition to the above-mentioned raw materials, dyes, fragrances, preservatives, surfactants, pigments, antioxidants and the like are appropriately blended within the range to achieve the object of the present invention. You can

The dosage form of the cosmetic of the present invention includes creams, emulsions, lotions, packs and the like. In the case of a milky lotion or the like, this cosmetic composition can be produced by a usual method of emulsifying and dispersing an oil phase and an aqueous phase, which are dissolved by heating, and cooling.

[0016]

EXAMPLES The present invention will be described in detail below based on examples and comparative examples. In addition,% shown in the examples means% by weight. Storage stability test method described in Examples, skin color lightness recovery test method,
The sensory test is as follows.

(1) Storage stability test method The sample was placed in a constant temperature bath at 45 ° C., observed daily, and evaluated according to the following criteria.

[0018]

Here, the abnormality means a phenomenon in which discoloration or odor occurs, precipitation occurs in lotion, and phase separation occurs in an emulsion.

(2) Skin color lightness recovery test method The back skin of 20 subjects was irradiated with ultraviolet rays in the UV-B region at twice the minimum erythema dose, and a sample application site and a non-application site were set to determine the skin The standard brightness (V0 value, V0 'value) was measured. After that, the sample was continuously applied twice a day twice a day for 3 months, and after 3,8,13 weeks, the lightness (Vn value, Vn 'value) of the skin of the applied site and non-application site was measured. The recovery of skin color was evaluated according to the following criteria. The brightness of the skin (V value of Munsell color system) was calculated from the X, Y, and Z values obtained by measurement with a high-speed spectrocolorimeter.
The evaluation was shown by the average value of the evaluation points of 20 subjects after 13 weeks.

[0021]

(3) Sensory test Twenty test subjects used the sample continuously for 10 days, and then the characteristics of the sample were evaluated. The test results indicate that the test items such as wettability, affinity, and whitening effect are "moisturized on skin", "good affinity for skin", "improved skin gloss and dullness". The number of respondents is shown.

Examples 1 to 6 and Comparative Examples 1 to 5 Inorganic acid ester salt of L-ascorbic acid, xanthan gum and sodium hyaluronate were blended in the composition shown in Table 1 to prepare a skin cream based on the following preparation method. .. The above-mentioned various tests were carried out for each, and the results are shown in Tables 2 and 3.

(Composition)

[Table 1]

[0025]

[Table 2]

[0026]

[Table 3]

(Preparation method) (A) at 70 ° C, B at 50 ° C
Dissolve evenly in (A), inject (B) into (A) while stirring (A) to emulsify and disperse, and then at a temperature of 3 while stirring.
Prepare by cooling to 0 ° C.

(Characteristics) The skin creams of Examples 1 to 6 of the present invention were found to have remarkable effects in various characteristics. On the other hand, the skin creams of Comparative Examples 1 to 5 were inferior in various properties as compared with the examples of the present invention.

Example 7 [Skin lotion] The skin lotion of the present invention having the composition shown in Table 4 was prepared by the following production method.

(Composition)

[Table 4]

(Preparation Method) The components (A) and (B) were mixed and dissolved, and (B) was added to (A), followed by mixing and stirring.

(Characteristics) The skin lotion of this Example 7 showed good results in all the above tests.

[0033]

As described above, it is clear that the present invention provides a skin cosmetic having an excellent whitening effect, a high moisturizing effect, and a high quality stability.

Claims (1)

[Claims] 1. A skin cosmetic comprising an inorganic acid ester salt of L-ascorbic acid, xanthan gum and sodium hyaluronate.