JP4849937B2 - Topical skin preparation - Google Patents

Description

  The present invention relates to an external preparation for skin which has good spreading at the time of application, does not become sticky, gives skin smoothness and has excellent storage stability.

  Conventionally, external preparations for skin such as creams and emulsions have been blended with various oils for the purpose of moisturizing the skin and changing the feel. Among them, silicone oil is widely used because it has a good sliding feel. And in order to mix | blend silicone oil stably, the technique of emulsifying using a surfactant in large quantities, or disperse | distributing using high molecular thickeners, such as a carboxy vinyl polymer, has been used. However, when a large amount of surfactant is used, there is a drawback that a sticky feeling derived from the surfactant is likely to occur. When a polymer thickener is used, a feeling of catching derived from the polymer thickener is felt. There was a drawback that it was likely to occur.

  For this reason, various studies have been conducted. For example, emulsified compositions for hair combining a specific alkyl-modified carboxyvinyl polymer and a silicone derivative, skin cosmetics, cosmetics combining a polyhydric alcohol, a low-viscosity silicone oil and an alkyl-modified carboxyvinyl polymer, including a silicone polymer and an AMPS polymer Examples thereof include compositions. However, further improvement is desired in recent years due to the increasing demands of consumers.

Japanese Patent Laid-Open No. 9-77641 JP-A-9-30924 JP-A-8-245357 JP 2003-277222 A

  Accordingly, an object of the present invention is to provide an external preparation for skin which has good spreading at the time of application, does not become sticky, gives the skin smoothness and is excellent in storage stability.

  As a result of intensive studies in view of such circumstances, the present inventors have found that a copolymer of sodium acrylate and sodium acryloyldimethyltaurine (sodium acrylate / acryloyldimethyltaurine), a highly polymerized silicone, and organic It has been found that by blending in combination with a powder, an external preparation for skin can be obtained which has good spreading at the time of application, does not become sticky, gives the skin smoothness, and is excellent in storage stability.

  That is, claim 1 of the present invention comprises (A) (sodium acrylate / acryloyldimethyltaurine) copolymer, (B) a highly polymerized silicone, and (C) an organic powder. It is.

  The second aspect of the present invention is the skin external preparation according to the first aspect, wherein the organic powder (C) is nylon powder.

  The present invention provides an external preparation for skin which has good spreading at the time of application, does not become sticky, gives skin smoothness, and has excellent storage stability.

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

The component (A) (sodium acrylate / acryloyldimethyltaurine) copolymer used in the external preparation for skin of the present invention is an International Cosmetic Ingredient Dictionary [Tenth Edition 2004, The Cosmetic, Toiletry, and Fragrance Assoc.
It is a copolymer of sodium acrylate and sodium acryloyldimethyltaurine, which is described as “SODIUM ACRYLATE / ACRYLOYLDIMETHYL TAURATE COPOLYMER” in “ciation issue”. As a commercial product containing the polymer, SIMULGEL EG (SEPPIC) containing 37.5% by mass of (sodium acrylate / acryloyldimethyltaurine) copolymer and containing isohexadecane, sorbitan oleate, polysorbate 80, and water as other components. Can be used suitably.

  The preferred amount of component (A) (sodium acrylate / acryloyldimethyltaurine) copolymer in the external preparation for skin of the present invention is 0.03 to 3.0% by mass (hereinafter simply abbreviated as%), more preferably. Is 0.1 to 2.0%. If the blending amount is less than 0.03%, the storage stability tends to be impaired, and if the blending amount exceeds 3.0%, stickiness tends to occur.

（式中、Ｒ_１はメチル基又は一部がフェニル基を表し、Ｒ_２はメチル基又は水酸基を表す。ｎは６５０以上である）で表されるものであれば限定されるものではなく、１種又は２種以上選択して用いることができる。
その中でも、重合度として、ｎが２０００〜５０００であると仕上がりの滑らかさの面で特に好ましい。 The highly polymerized silicone of component (B) used in the skin external preparation of the present invention has the following general formula (1):

(In the formula, R ₁ represents a methyl group or a part thereof represents a phenyl group, R ₂ represents a methyl group or a hydroxyl group, and n is 650 or more). One type or two or more types can be selected and used.
Among them, the polymerization degree is particularly preferably n in the range of 2000 to 5000 in terms of smooth finish.

  The preferred amount of component (B) highly polymerized silicone in the external preparation for skin of the present invention is 0.5 to 10.0%, more preferably 1.0 to 5.0%. If the blending amount is less than 0.5%, the smoothness of the finish tends to be lacking, and if the blending amount exceeds 10.0%, the spread during application tends to be impaired.

As the component (C) organic powder used in the external preparation for skin of the present invention, nylon 6, nylon 12, nylon 66, polyethylene, polypropylene, benzoguanamine powder, polytetrafluoroethylene, polystyrene, polyethylene terephthalate, polycarbonate, polymethyl Methacrylate (trade name: Microsphere [manufactured by Matsumoto Yushi Seiyaku Co., Ltd.]), polymethylsilsesquioxane (trade name: Tospearl [manufactured by GE Toshiba Silicone Co., Ltd.]), dimethylpolysiloxane polymer (trade name: Trefil [Toray Dow Corning Silicone Co., Ltd.]), octenyl succinic acid starch ester aluminum (trade name: Dry Flow [manufactured by National Starch Co., Ltd.]), etc., and those having a particle size of 0.5-30 μm, preferably 1.0-20 μm. Select one or more types to use Can. When the particle size of the powder is less than 0.5 μm, the spread at the time of application may be deteriorated, and when the particle size is larger than 30 μm, a rough feeling tends to occur.

  Of the organic powders, nylon 6 and nylon 12 are particularly excellent in terms of imparting smoothness.

  As a compounding quantity of the organic powder of the component (C) in the skin external preparation of this invention, 0.1-10.0% is preferable, More preferably, it is 0.5-5.0%. If the blending amount of the organic powder is less than 0.1%, stickiness may occur or smoothness may be lost. Moreover, when a compounding quantity exceeds 10.0%, a rough feeling may be produced.

  In the present invention, when the mass ratio B: C of the blending amount of the component (B) highly polymerized silicone and the component (C) organic powder is in the range of 1: 5 to 5: 1, there is no stickiness and smoothness. It is particularly excellent in terms of providing thickness.

  In the present invention, in addition to the above essential components, anionic surfactants, amphoteric surfactants, nonionic surfactants, gums, oils, and other polymer compounds, as long as the effects of the invention are not impaired. , Lower alcohols, polyhydric alcohols, higher alcohols, inorganic powders, propellants, preservatives, chelating agents, antioxidants, pH adjusters, dyes, fragrances, and the like can be blended.

  The external preparation for skin of the present invention can be applied to skin cosmetics such as creams and emulsions, skin cleansers such as facial cleansers, hand soaps, body shampoos and makeup removers.

  Hereinafter, the present invention will be described with reference to examples and comparative examples. The present invention is not limited to these.

  Test methods for physical property tests and sensory tests shown in Examples and Comparative Examples are as follows. In addition, the compounding quantity of the composition shown in the following table | surfaces is each shown by%.

(1) Good spread, no stickiness, smoothness A sample of a skin external preparation (cream) was applied to the face by 20 subjects. Thereafter, the subject himself / herself performed sensory evaluation on the items of good spread, no stickiness, and smoothness, and obtained an average evaluation score. The evaluation criteria are as follows.

4: Very good 3: Good 2: Slightly bad 1: Bad

(2) Storage stability A sample of the external preparation for skin (cream) was put in a test tube and centrifuged at 40 ° C. and 3000 rpm for 30 minutes and 1 hour. The subsequent state was observed and evaluated. The evaluation criteria are as follows.

○: No change in 1 hour △: No change in 30 minutes ×: Change in separation, precipitation, etc.

Examples 1-3, Comparative Examples 1-4
A skin external preparation (cream) having the formulation shown in Table 1 was prepared by a conventional method, and the above tests were performed. The results are also shown in Table 1.

  As is apparent from Table 1, all of the external preparations for skin (creams) using the components of the present invention had excellent performance. On the other hand, in the comparative example lacking any of the essential components, it was inferior in any aspect of good spread, no stickiness, smoothness, and storage stability.

Example 4 (hand cream)
(A) SIMULGEL EG (trade name) SEPPIC 2.5%
(B) Highly polymerized dimethiconol (degree of polymerization 3000) 5.0
(C) Nylon 12 powder (SP-500 (trade name) manufactured by Toray Industries, Inc.) 2.0
(C) Dimethylpolysiloxane polymer 1.0
(Trefill E-506S (trade name) manufactured by Toray Dow Corning)
Glycerin 5.0
Methylphenyl polysiloxane 10.0
Dipropylene glycol 5.0
Xanthan gum 0.05
Isononyl isononanoate 3.0
Citric acid appropriate amount Sodium citrate appropriate amount Mixed plant extract 0.5
(Falco Rex BX32 (trade name) made by Ichimaru Falcos)
Mixed plant extract 0.5
(Falco Rex BX52 (trade name) made by Ichimaru Falcos)
Fragrance 0.3
Purified water balance

  When the skin external preparation of the said composition was created and evaluated, it had the outstanding performance about the ease of spreading, non-stickiness, smoothness, and storage stability.

  Table 2 shows the composition of the fragrance used in Example 4 above.

Claims (3)

(A) (sodium acrylate / acryloyldimethyltaurine) copolymer: 0.03 to 3.0% by mass, (B) the following general formula (1)

(In the formula, R ₁ represents a methyl group or a part thereof represents a phenyl group, R ₂ represents a methyl group or a hydroxyl group, and n is 2000 to 3000 ): 0.3-5. An external preparation for skin containing 0% by mass and (C) nylon powder: 0.05 to 5.0% by mass.   The skin external preparation according to claim 1, wherein the particle size of the component (C) is 1.0 to 20 µm.   The skin external preparation of Claim 1 or 2 whose mass ratio [(B) :( C)] of a component (B) and a component (C) is 1: 5-5: 1.