JPH1192329A - Skin preparation for external use - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a powder-containing skin preparation for external use, having excellent dry feeling when applied to the skin, free from stickiness or scattering of powder and useful as powdery cosmetic or the like for body by including an alkyl-modified carboxyvinyl polymer, a cyclic silicone or the like. SOLUTION: This powder-containing skin preparation contains (A) preferably 0.01-2 wt.% alkyl-modified carboxyvinyl polymer (e.g. acrylic acid-methacrylic acid alkyl copolymer), (B) preferably 0.1-40 wt.% cyclic silicone (e.g. octamethylcyclotetrasiloxane) and (C) preferably 0.1-30 wt.% porous and/or water-absorbing powder (e.g. corn starch). The skin preparation for external use is useful as a cosmetic, quasi-drug and medicine.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to an external preparation for skin. More specifically, the present invention relates to a powder-containing external preparation for skin which has excellent usability for giving a dry feeling when applied to the skin, has no stickiness, and does not have a swelling of powder.

[0002]

2. Description of the Related Art Conventionally, the technology of blending powder into cosmetics is as follows.
Adhesive components such as dirt and excess sebum and sweat on the skin are adsorbed on the powder to wash the skin, and its absorption enhances sebum resistance and sweat resistance to improve the durability of the skin or to expose it It is widely used for the purpose of enhancing the feeling of use using the feel.

For example, as a lotion, calamine (0.
There is a lotion containing zinc oxide containing about 5% ferric oxide, which has been widely used as a summer lotion having a drying, cooling and protective action.

[0004]

However, the above-mentioned powder-containing cosmetics are basically intended for moisturizing or astringent, so that the feeling of use has not been considered much. Further, in emulsified cosmetics, since a large amount of powder cannot be blended due to emulsification balance, it has not been possible to impart a dry feeling and is not satisfactory.

[0005] On the other hand, baby powder and talcum powder are known as body powder cosmetics that are used for the whole body after a summer bath or after shaving to give a soft feeling to the skin and to absorb sweat and moisture. Have been. Also, dusting powders for blending fragrances into powders are known.

[0006] However, these powdered body powder cosmetics to be used after powdering are inconvenient in terms of usability such as scattering of powder and soiling of clothes and peripheral parts.
Further, there is a problem that the powder becomes white and remains after the powdering.

The present inventor has made intensive studies in view of the above problems, and as a result, has found that an alkyl-modified carboxyvinyl polymer and
By blending a porous silicone and / or a water-absorbing powder with a cyclic silicone, a large amount of powder can be blended, and a non-sticky, powdery skin external preparation with excellent dry feel when applied to the skin can be obtained. And found that the present invention was completed.

[0008] It is an object of the present invention to provide a powder-containing external preparation for skin which has a smooth feel when used, has no stickiness, and is not damaged.

[0009]

That is, the present invention provides a skin external preparation characterized by containing an alkyl-modified carboxyvinyl polymer, a cyclic silicone, and a powder.

[0010] Further, the present invention provides the above-mentioned cyclic silicone,
It is an object of the present invention to provide the above external preparation for skin, which is octamethylcyclosiloxane and / or decamethylcyclopentasiloxane.

Further, the present invention provides the above external preparation for skin, wherein the powder is a porous powder or a water-absorbing powder.

Further, the present invention provides the above external preparation for skin, wherein the powder is corn starch.

Further, the present invention provides the above external preparation for skin, wherein the content of the alkyl-modified carboxyvinyl polymer is 0.01 to 2% by weight based on the total amount of the external preparation for skin.

The present invention also provides the above external preparation for skin, wherein the content of the cyclic silicone is 0.1 to 40% by weight based on the total amount of the external preparation for skin.

Further, according to the present invention, the content of the powder is preferably
An object of the present invention is to provide the above-mentioned external skin preparation in an amount of 0.1 to 30% by weight based on the total amount of the external skin preparation.

Further, the present invention provides the above-mentioned external preparation for skin, wherein the external preparation for skin is an emulsified powder cosmetic.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The configuration of the present invention will be described below in detail.

The alkyl-modified carboxyvinyl polymer used in the present invention is an alkyl acrylate alkyl methacrylate copolymer such as CARBOPOL 1342, PEMULEN TR-1, PEMUL
What is known by the brand name of EN TR-2 (BFGoodrich) is mentioned.

The compounding amount of the alkyl-modified carboxyvinyl polymer is 0.01 to 2% by weight based on the total amount of the external preparation for skin. If the content is less than 0.01% by weight, the stability becomes poor,
If the content exceeds 2% by weight, stickiness becomes noticeable in use.

The cyclic silicone used in the present invention includes:
Examples include octamethylcyclotetrasiloxane, decamethylcyclopentasiloxane, dodecamethylcyclohexasiloxane, and the like. Among these, octamethylcyclotetrasiloxane and decamethylcyclopentasiloxane are particularly preferable from the viewpoint of usability.

The compounding amount of the cyclic silicone is 0.1 to 40% by weight based on the total amount of the external preparation for skin.
1 to 30% by weight. If it is less than 0.1% by weight, the feeling of dryness is poor, and if it is more than 40% by weight, the oil content is too large, and it is difficult to adjust to the skin and sticky.

The powder used in the present invention is preferably a porous and / or water-absorbing powder. For example, starches obtained from corn, potato, etc., silicic anhydride, talc, kaolin, magnesium aluminate silicate, metasilicate Powders such as magnesium aluminate, calcium alginate, synthetic and natural heraclitate, bentonite and the like. Among these, from the viewpoint of usability, corn starch, potato starch and silicic anhydride are preferred, and corn starch is particularly preferred.

The compounding amount of the powder is 0.1 to 30% by weight, preferably 1 to 10% by weight based on the total amount of the external preparation for skin.
% By weight. If the compounding amount of the powder is less than 0.1% by weight, the feeling of smoothness after application to the skin is poor, and if it exceeds 30% by weight, the powder is distorted at the time of applying the skin.

The external preparation for skin of the present invention contains, in addition to the above essential components, oils other than the cyclic silicone which can be generally incorporated into the external preparation for skin, surfactants, drugs, humectants, thickeners, preservatives, A metal sequestering agent, a fragrance, and other components can be appropriately blended according to the use, purpose, and the like as long as the effects of the present invention are not impaired, and the desired product can be produced by a conventional method.

Although the dosage form of the present invention is optional, it is preferably used as an emulsified composition. In a conventional powder-containing emulsified composition, from the viewpoint of emulsification stability, it is sufficient to give a dry feeling. Although it was difficult to mix a large amount of powder, it is significant in the present invention that a sufficient amount of powder capable of imparting a smooth feeling can be mixed into the emulsion composition.

The external preparation for skin of the present invention is used as cosmetics, quasi-drugs and pharmaceuticals, and is particularly preferably used as a powder cosmetic for a body for the whole body.

[0027]

Next, the present invention will be described in more detail by way of examples. The present invention is not limited by this. The blending amounts in the examples represent% by weight.

"Examples 1 to 8, Comparative Examples 1 and 2""Table1"
In addition, emulsified powder cosmetics for bodies having the compositions shown in Table 2 were manufactured by a conventional method, and the feeling of use was evaluated for (1) smooth feeling, (2) sticky feeling, and (3) twist. Each evaluation method is as follows. The results are shown in Table 1 and Table 2 together.

"Usability test" The cosmetics of the Examples and Comparative Examples were applied to the forearm of 10 female professional panels, and the feeling of use accompanying the application was evaluated according to the following evaluation criteria to determine the usability. did. <Evaluation Criteria> (1) Dry feeling ：: Eight or more of the ten respondents felt dry. ：: 5 to 7 out of 10 respondents felt smooth. Δ: 3 to 4 persons answered that there was a feeling of smoothness among 10 persons. ×: Out of 10 persons, 2 or less answered that there was a feeling of smoothness. (2) Stickiness ：: Eight or more of the ten responded that there was no stickiness. ：: 5 to 7 out of 10 persons answered that there was no stickiness. Δ: 3 to 4 persons out of 10 answered that there was no stickiness. ×: Out of 10 people, 2 or less answered that there was no stickiness. (3) Distortion ◎: 8 or more out of 10 responded that they were not disturbed. ：: 5 to 7 out of 10 respondents did not change. Δ: 3 to 4 respondents out of 10 respondents did not change. ×: Two or less out of 10 respondents were not allowed.

[0030]

[Table 1] ---------------------------------------------- -------------------------- Example 1 Example 2 Example 3 Example 4 Comparative Example 1 Comparative Example 2 ------ -------------------------------------------------- ---------------- glycerin 33 33 33 33 ethanol 10 10 10 10 10 10 alkyl-modified carboxy 0.2 0.2 0.2 0.2 0.2 0.2 0. 2 Phenol polymer * octamethylcyclotetra55 20 20 20-siloxane squalane-----20 corn pentane 0.5 10 0.5 10 -10 Caustic 0.1 0.1 0.1 0.1 0.1 0.1 0.1 Purified water residue residue residue residue residue residue residue --------------------------------------- --------------------------------- Dry feeling ○ ◎ ○ ◎ △ △ Sticky ◎ ◎ ◎ ◎ ○ △ Deviated ◎ ◎ ◎ ◎ ◎ △ -------------------------- ---------------------------------------------- * PEMULEN TR- 1 (BFGoodrich)

[0031]

[Table 2] ---------------------------------------------- -------- Example 5 Example 6 Example 7 Example 8 ------------------------------ ------------------------ Glycerin 33 33 Ethanol 10 10 10 10 Alkyl-modified carboxy 0.2 0.2 0.2 0.2 0.2 Polymer * octamethylcyclotetra 20 20 20 20 siloxane squalane----maize 1---------1--Silicic anhydride-1-talc-1-0.1 Caustic 0.1 0.1 0. 10.1 Purified water residue residue residue residue residue ---------------------------------------- -------------- Smooth feeling ◎ ○ ○ ○ Sticky ◎ ◎ ◎ ○ Deflected ◎ ◎ ◎ ◎ -------------------- ---------------------------------- * PEMULEN TR-1 (BFGoodrich)

From Table 1, it can be seen that the external preparation for skin of the present invention has an excellent dry feel, has no stickiness, and has excellent usability without powder. Further, it can be seen that the external preparation for skin of the present invention using corn starch as the powder has particularly excellent usability.

[0033]

According to the present invention, there is provided a powder-containing external preparation for the skin which has an excellent dry feel when applied to the skin, has no stickiness, and has a good powder quality.

Claims (8)

[Claims] 1. A skin external preparation comprising an alkyl-modified carboxyvinyl polymer, a cyclic silicone, and a powder. 2. The external preparation for skin according to claim 1, wherein the cyclic silicone is octamethylcyclosiloxane and / or decamethylcyclopentasiloxane. 3. The external preparation for skin according to claim 1, wherein the powder is a porous powder or a water-absorbing powder. 4. The external preparation for skin according to claim 3, wherein the powder is corn starch. 5. The content of the alkyl-modified carboxyvinyl polymer is 0.01 to 2 with respect to the total amount of the external preparation for skin.
5. The external preparation for skin according to claim 1, wherein the amount is% by weight. 6. The content of the cyclic silicone is 0.1 to 40% by weight based on the total amount of the external preparation for skin.
The skin external preparation according to 2, 3, 4 or 5. 7. The composition according to claim 1, wherein the content of the powder is 0.1 to 30% by weight based on the total amount of the external preparation for skin.
7. The external preparation for skin according to 4, 5 or 6. 8. The external preparation for skin according to claim 1, wherein the external preparation for skin is an emulsified powder cosmetic.