JPH10306010A - Skin cosmetic - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a skin cosmetics manifesting antiaging, bihada effects, excellent in feeling to the skin, by containing ethylglucoside, α-hydoxy acids and polyalcohol. SOLUTION: This cosmetic contains (A) ethylglucoside (e.g. α-form, etc.), (B) α-hydroxy acid (e.g. glycolic acid, malic acid, etc.) and (C) polyalcohol (e.g. glycerin, dipropylene-glycol, etc.). The formulating amount of the individual component in the prescribed cosmetics is preferably, 0.001-10.0 wt.% for component A, 0.05-20.0%, for component B, 0.01-20%, for component C.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to a skin cosmetic, and more particularly, to an excellent anti-aging (effect of improving rough skin,
The present invention relates to a skin cosmetic composition which can express and impart a skin effect and a beautiful skin effect, and which is excellent in use feeling (no stickiness).

[0002]

2. Description of the Related Art Age-related changes in the skin surface such as dryness, wrinkles, changes in skin texture, and spots are problems that can be improved by skin care using cosmetics (Review of Mitsuhiro Denda: Japanese cosmetics engineer) Journal, Vol. 30, No. 4, 377-3
87, 1996). The condition of the dry, rough skin-like skin surface seen in many elderly people is attributed to changes in the morphology and function of the stratum corneum (Berwan et al .: Archives Dermatology, Vol. 127, No. 5, No. 5, 666-672). ,
1991). Rough skin, that is, dry skin, is basically caused by impairment of the water regulation system and defense system mainly due to the decrease in water retention and barrier properties of the stratum corneum. 19
Blank in 1975 (Blank: Journal of Investigativ Dermatology, 18, 433-
(440, 1952) proved that the barrier to water evaporation was in the stratum corneum, and that hydration of the stratum corneum was mainly due to water. ： Journal of the Japan Cosmetic Science Society, 2
0, 2, 100-114, 1996).

[0003] As such an agent for improving the skin surface with aging, various external preparations for the skin which give the skin surface an appropriate moist feeling and flexibility have been proposed. For example, compounds having high hygroscopicity and water retention, such as polyhydric alcohols, are widely used as humectants in skin cosmetics. Further, Japanese Unexamined Patent Application Publication No.
No. 45037 discloses an external preparation for skin containing one or more selected from the group consisting of amino acids, amino acid derivatives and urea, and trehalose. JP-A-6-2792
No. 58 discloses a skin external preparation comprising a combined complex of an α-hydroxy acid and a vitamin E group compound or a derivative thereof. JP-A-6-279261 proposes an external preparation for skin containing one or more mucopolysaccharides and lactose.

Regarding the ethyl glucoside according to the present invention, the present inventors have previously reported that α-ethyl glucoside contained in sake has a keratinocyte keratinization promoting effect and prevents and improves rough skin ( 37th SCC
J Research Discussion, Proceedings, 43-45, 1995
January 16).

[0005] Further, α-hydroxy acids are contained in fruits, wines and the like, and have been used in cosmetics for a long time. As its mechanism of action, it is known that it has an xeroderma and wrinkle-improving effect in order to loosen the bonding force of the stratum corneum of the epidermis and make the densely stratum corneum thinner (Journal of American Academy Dermatology) , 11 volumes, 5
No., p. 867, 1974), a sufficient antiaging effect of the skin cannot be obtained.

[0006] Furthermore, polyhydric alcohols have high hygroscopicity and water retention properties, and are widely used as humectants in skin cosmetics.

However, the effects of these compounds according to the present invention are not sufficient, the feeling of use (stickiness) is not satisfactory, and the function is improved by focusing on a part of the skin. An improver has not yet been obtained.

[0008]

That is, an object of the present invention is to provide an anti-aging effect (rough skin improving effect, keratin improving effect) and a beautiful skin effect, and to be excellent in use feeling (no stickiness). An object of the present invention is to provide a skin cosmetic.

[0009]

[Means for Solving the Problems] In view of these circumstances,
Means for Solving the Problems The present inventors have intensively searched for skin cosmetics that can exhibit and impart an anti-aging effect (rough skin improving effect, keratin improving effect) and a beautiful skin effect and have an excellent feeling in use (no stickiness). It has been found that a skin cosmetic comprising the above composition satisfies it. The above object can be achieved by a skin cosmetic comprising ethyl glucoside, α-hydroxy acid and polyhydric alcohol. That is, when ethyl glucoside, α-hydroxy acid and polyhydric alcohol are used in combination, an excellent skin aging prevention effect is exhibited by their synergistic action.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION

Hereinafter, embodiments of the present invention will be described in detail.

The above report shows that ethyl glucoside used in the present invention has a structural isomer.
It is desirable to use an α-isomer which has been confirmed to have a rough skin improving effect or a mixture thereof. The compounding amount of the skin cosmetic of the present invention is 0.001 to 10.0% by weight (hereinafter, wt%).
Is abbreviated).

The α-hydroxy acid used in the present invention includes glycolic acid, malic acid, tartaric acid, citric acid, lactic acid and the like. The blending amount in the skin cosmetic of the present invention is preferably 0.05 to 20.0 wt%.

Further, the polyhydric alcohol used in the present invention includes glycerin, dipropylene glycol, 1,3-butylene glycol, polyethylene glycol and the like. This component can be used in combination of one or more kinds, and the amount to be blended into the skin cosmetic varies depending on the combination of the polyhydric alcohol used, but is 0.01 to 20.0 w.
t% is preferred.

[0015] Skin cosmetics also include bath additives.

The dosage form of the skin cosmetic of the present invention is not particularly limited, and the dosage form of a normal skin cosmetic such as cream, milky lotion, lotion, ointment or powder may be applied. Can be.

Further, the skin cosmetic of the present invention achieves the object of the present invention by using, as other components, an emulsifier, an oily substance, a humectant, a thickener, a fragrance, a preservative, an antioxidant, and a coloring agent. It can be appropriately blended within the range.

[0018]

The present invention will be described below in more detail with reference to Examples and Comparative Examples. In addition, (1) the measuring method of the rough skin improvement effect described in an Example, (2) the measuring method of the keratin improvement effect, and (3) the sensory test are as follows.

(1) Measuring Method of Rough Skin Improving Effect Four 10 subjects of middle-aged and elderly subjects having rough skin on the lower leg were measured.
Weekly continuous application effect was examined. That is, 5 g of a sample of about 0.5 g twice a day (morning and evening) was placed on the left lower leg test site of the subject.
It was applied to a section of × 10 cm, and the condition of the skin before and after the test was determined according to the criteria shown in Table 1. In addition, the lower leg on the right side was used as a target without applying the test sample.

[0020]

[Table 1]

Then, the results of the judgment of the test site and the control site before and after the test are compared, and when the degree of dryness of the skin is improved by two or more stages (for example, + → −, ++ → ±), “effective” is improved by one stage. The case was evaluated as "slightly valid" and the case without any change was regarded as "invalid". In addition, the test result was shown by the number of subjects who became "effective" and "slightly effective".

(2) Method for measuring the effect of improving keratin (enhancing the exfoliative properties of keratinocytes) A scotch tape (Mending Tape, Nichiban Co.) is adhered to the skin of the test area after the above-described measurement test for improving rough skin. The state of the keratinous cells adhered to the tape when peeled was examined in detail by a scanning electron microscope, and the keratinocyte peeling properties of the skin were classified according to the criteria shown in Table 2 to determine the keratin improving effect.

[0023]

[Table 2]

[0024] The judgment is "valid" when the difference between the evaluation point of the test site and that of the control site after continuous application for 4 weeks is 2 or more, "slightly effective" when it is 1 or more, and 0 when it is not. "Invalid". In addition, the test result was shown by the number of subjects who became "effective" and "slightly effective".

(3) Sensory test (beautiful skin effect) Female subjects complaining of rough skin, fine lines, dry skin, etc. (35
Appropriate amount of the test sample was applied to the face twice a day (morning and evening) for 10 consecutive persons for 10 months, and the effect after one month was evaluated. The test results were as follows: for each item of skin wettability, smoothness, and elasticity, "skin was moistened", "skin became smooth", and "skin became taut" The number of respondents is shown.

Example 1, Comparative Examples 1 to 3 (Lotion)

[0027]

[Table 3]

Preparation Method A lotion was prepared according to the formulation shown in Table 3 according to a conventional method.

Characteristics For each lotion shown in Table 3, the above-mentioned (3) sensory test was carried out. Table 4 shows the results.

[0030]

[Table 4]

As is evident from Table 4, Example 1 was remarkably excellent in all of the wettability, smoothness and elasticity items as compared with Comparative Examples 1 to 3.

Example 2, Comparative Examples 4 and 5 (Emulsion)

[0033]

[Table 5]

Preparation Method After the raw materials in the group (A) in Table 5 were melted at 70 ° C., they were gradually added to the raw material (B) group, which had been heated to 75 ° C. in advance, with stirring, to perform preliminary emulsification. Thereafter, emulsification was completely performed using a homogenizer, and the mixture was cooled to 30 ° C.

Characteristics Each of the emulsions shown in Table 5 was subjected to the (1) rough skin improvement test and (2) keratin improvement effect test. Table 6 shows the results.
Shown in

[0036]

[Table 6]

As is clear from Table 6, Example 2 shows that Comparative Example 4 to Comparative Example 4 show the respective items of the rough skin improvement effect and the keratin improvement effect.
It was much better than 5.

Example 3, Comparative Examples 6 and 7 (Cream) Composition

[0039]

[Table 7]

Preparation Method The raw materials of the group (A) in Table 7 were dissolved at 70 ° C., and gradually added to the raw material (B) group, which had been heated to 75 ° C. in advance, with stirring, to perform preliminary emulsification. Thereafter, emulsification was completely performed using a homogenizer, and the mixture was cooled to 30 ° C.

Characteristics As is clear from Table 7, the cream of Example 3 has excellent skin beautiful effect and excellent skin aging prevention effect (rough skin improving effect, keratin improving effect) as compared with the creams of Comparative Examples 5 and 6. showed that.

Example 4 (bath additive) Composition

[0043]

[Table 8]

Preparation Method A bath agent was prepared according to the formulation shown in Table 8 according to a conventional method.

Characteristics 30 g of the bathing agent was dissolved in about 200 liters of warm water and continuously used for 2 weeks. The bathing agent of the present Example 4 was superior to Comparative Example 7 in terms of the excellent skin beautiful effect and the excellent skin aging prevention effect ( Rough skin improvement effect, keratin improvement effect).

[0046]

As described above, it is apparent that the present invention provides a useful skin cosmetic which is excellent in skin aging prevention effect (rough skin improvement effect, keratin improvement effect) and skin beautiful effect.

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Hiroshi Kuwahara 5-3-28 Kotobukicho, Odawara City, Kanagawa Prefecture Inside the Kanebo Cosmetics Research Institute (72) Inventor Jo Aoki 5-3-3 Kotobukicho, Odawara City, Kanagawa Prefecture No. 28 Kanebo Cosmetics Research Laboratory

Claims (1)

[Claims] 1. A skin cosmetic comprising ethyl glucoside, α-hydroxy acid and polyhydric alcohol.