JP2007277142A - External preparation for skin - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an external preparation for skin, well extendable when coated, causing no sticky feeling, giving the skin moist feeling and excellent in storage stability. <P>SOLUTION: The external preparation for skin comprises (A) a (sodium acrylate/acryloyl dimethyltaurine) copolymer, (B) a highly polymerized silicone and (C) a polyether-modified silicone represented by general formula (1) [wherein, m is 50-1,000; n is 1-40; and (a) and b are each an integer of 5-50]. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to an external preparation for skin which has good spreading at the time of application, is not sticky, gives a moist feel to the skin, 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. (See Patent Documents 1 to 4)

  Various studies have also been conducted on using polyether-modified silicone as a less sticky surfactant. For example, an emulsified cosmetic combining silicone oil and a specific high molecular weight polyether-modified silicone, a silicone emulsion composition combining silicone oil and a specific polyether-modified silicone, and the like. (See Patent Documents 5 and 6)

  Furthermore, studies are being made to reduce stickiness and improve storage stability by combining a polymer thickener and a polyether-modified silicone. For example, a skin external preparation that combines an alkyl-modified carboxyvinyl polymer and a polyether-modified silicone of a specific HLB, an emulsion composition that combines a specific polyether-modified silicone, an oil, and a water-soluble polymer having a specific molecular weight. (See Patent Documents 7 and 8)

Japanese Patent Laid-Open No. 9-77641 JP-A-9-30924 JP-A-8-245357 JP 2003-277222 A JP-A-8-268831 JP-A-8-268831 JP 2000-34215 A JP-A-10-306020

  As described above, skin external preparations have been developed that give the skin a good feel, are not sticky, and have excellent storage stability. However, in recent years, further improvement has been desired due to increasing consumer demand. Yes.

  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 a moist feel to the skin, and is excellent in storage stability.

  As a result of intensive studies in view of such circumstances, the present inventors have determined that a copolymer (sodium acrylate / acryloyldimethyltaurine) that is a copolymer of sodium acrylate and sodium acryloyldimethyltaurine, a highly polymerized silicone, It has been found that by blending with a polyether-modified silicone, a topical skin preparation having good spreading at the time of application, non-stickiness, moist feeling on the skin, and excellent storage stability can be obtained. Was completed.

（式中、Ｒは水素又は炭素数１〜４のアルキル基であり、ｍは５０〜１０００、ｎは１〜４０、ａとｂはそれぞれ５〜５０の整数）で示されるポリエーテル変性シリコーンとを含有することを特徴とする皮膚外用剤である。 That is, claim 1 of the present invention includes (A) (sodium acrylate / acryloyldimethyltaurine) copolymer, (B) highly polymerized silicone, and (C) the following general formula (1).

(Wherein R is hydrogen or an alkyl group having 1 to 4 carbon atoms, m is 50 to 1000, n is 1 to 40, and a and b are each an integer of 5 to 50) It is a skin external preparation characterized by containing this.

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

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

  The component (A) (sodium acrylate / acryloyldimethyltaurine) copolymer used in the topical skin preparation of the present invention can be obtained from International Cosmetic Ingredient Diary [Tenth Edition 2004, The Cosmetic, Toiletry, and Fragrance United States It is a copolymer of sodium acrylate and sodium acryloyldimethyltaurine, which is described as “ACRYLOYLDIMETHYL TAURATE COPOLYMER”. 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 external preparation for skin of the present invention has the following general formula (2)

(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 the smoothness of the 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%, stickiness tends to occur, and if the blending amount exceeds 10.0%, the spread during application tends to be impaired.

（式中、Ｒは水素又は炭素数１〜４のアルキル基であり、ｍは５０〜１０００、ｎは１〜４０、ａとｂはそれぞれ５〜５０の整数）で示されるものであり、その好ましい配合量は、０．１〜５．０％であり、更に好ましくは０．５〜３．０％である。配合量が０．１％未満であると、保存安定性を損なう傾向にあり、配合量が５．０％を超えるとべたつきを生じやすくなる傾向にある。 The component (C) polyether-modified silicone used in the skin external preparation of the present invention has the following general formula (1):

(Wherein R is hydrogen or an alkyl group having 1 to 4 carbon atoms, m is 50 to 1000, n is 1 to 40, and a and b are each an integer of 5 to 50), A preferable compounding amount is 0.1 to 5.0%, more preferably 0.5 to 3.0%. If the blending amount is less than 0.1%, the storage stability tends to be impaired, and if the blending amount exceeds 5.0%, stickiness tends to occur.

  In the present invention, in addition to the above essential components, anionic surfactants, amphoteric surfactants, nonionic surfactants, gums, oils, lower alcohols, polyvalent alcohols, as long as the effects of the invention are not impaired. Alcohols, higher alcohols, powders, propellants, preservatives, chelating agents, antioxidants, pH adjusters, pigments, fragrances and the like can also 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, moist feeling A sample of a skin external preparation (cream) was applied to the face by 20 subjects. Thereafter, the subject himself performed sensory evaluations on items of good spread, no stickiness, and moist feeling, 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 1-5
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, moist feeling, 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) Polyether-modified silicone 7.0
(BY11-030 (trade name) manufactured by Toray Dow Corning, 50% solution)
Glycerin 5.0
Methylphenyl polysiloxane 7.0
Squalane 3.0
Dipropylene glycol 5.0
Xanthan gum 0.05
2-Ethylhexanoic acid triglyceride 3.0
Vitamin E 0.05
Stearyl glycyrrhizinate 0.1
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 (1)

(A) (sodium acrylate / acryloyldimethyltaurine) copolymer, (B) highly polymerized silicone, (C) the following general formula (1)

(Wherein R is hydrogen or an alkyl group having 1 to 4 carbon atoms, m is 50 to 1000, n is 1 to 40, and a and b are each an integer of 5 to 50) An external preparation for skin, comprising: