JP4688671B2 - Skin cosmetics - Google Patents

Description

  The present invention relates to a skin cosmetic. More specifically, the present invention relates to a skin cosmetic that is excellent in stability and water resistance, has good skin familiarity, does not feel smooth on the skin, and is extremely excellent in usability.

  Techniques using high molecular weight dimethylpolysiloxane or high molecular weight methylphenylpolysiloxane are known as skin cosmetics that effectively protect the skin from water work and have a refreshing feeling of use ( Patent Document 1).

In addition, a technique using an amino-modified or ammonium-modified polymer silicone having an improved effect of preventing adhesion to a contact object is also known (Patent Document 2).
These techniques have also been used in sunscreen cosmetics that are water resistant to seawater and pool water.

Japanese Patent No. 2525194 Japanese Patent No. 3130969

  However, hand creams for skin cosmetics to which these techniques are applied are not fully satisfactory in terms of familiarity with the skin. And the water repellent film that remains unfit for the skin makes it slippery when it touches glass or ceramic tableware, which greatly reduces the efficiency of manual water work. There was a problem.

  In addition, even with sunscreen cosmetics that apply these technologies, vinyl-processed flip-flops are difficult to wear, and it is difficult to slip on surfboards used for surfing at sea. there were.

  As a result of intensive research aimed at solving the above problems, the present inventors have found that a specific polymer silicone that is well-familiar to the skin, a specific isoparaffin in an amount necessary to dissolve the polymer silicone, and The present inventors have found that by adding a specific water-soluble thickener, it is possible to provide a skin cosmetic with good water resistance, excellent skin fit and excellent skin slip, and excellent stability. It came to be completed.

（１）
（R₁はメチル基またはその一部がフェニル基を表し、R₂は水酸基を表し、R₃は水酸基またはその一部がメチル基を表し、ｍおよびｎは、ｍ＋ｎが3,000以上20,000以下であり、かつｎ／ｍが0以上1／500以下という条件を満たす整数を表す）
（Ｂ）イソドデカン及び／又はイソヘキサデカンと、
（Ｃ）アクリル酸Ｎａ・アクリロイルジメチルタウリンＮａコポリマーと、
（Ｄ）水を含有し、
（Ｂ）イソドデカン及び／又はイソヘキサデカンの配合量が、（Ａ）高分子シリコーンに対し１倍以上5000倍以下の重量比率であることを特徴とする皮膚乳化化粧料を提供するものである。 That is, the present invention includes (A) one or more polymer silicones represented by the following general formula (1):

(1)
(R ₁ represents a methyl group or a part thereof represents a phenyl group, R ₂ represents a hydroxyl group, R ₃ represents a hydroxyl group or a part thereof represents a methyl group, and m and n are m + n of 3,000 to 20,000. And an integer satisfying the condition that n / m is 0 or more and 1/500 or less)
(B) isododecane and / or isohexadecane ;
(C) Na acrylate / acryloyl dimethyl taurine Na copolymer ;
(D) contains water ,
(B) A skin emulsified cosmetic characterized in that the blending amount of isododecane and / or isohexadecane is 1 to 5000 times the weight ratio of (A) the polymeric silicone .

  The skin cosmetics of the present invention are very familiar to the skin, have no feeling of slipping, and are extremely excellent in usability. Therefore, the water-repellent film that is left unfit for the hand cream makes it slippery when touching glass or ceramic tableware, etc., and extremely reduces the efficiency of manual water work. There is no. Moreover, the sunscreen cosmetics can avoid the problems that the flip-flops are slippery and difficult to wear, and that it is difficult to slip on the surfboard. Furthermore, the skin cosmetic of the present invention is excellent in stability and water resistance.

  Hereinafter, the present invention will be described in detail.

The high molecular weight silicone used in the present invention is a high molecular weight silicone represented by the above general formula (1), and the value of n in the formula is 3,000 or more and 20,000 or less. The property is soft rubber at room temperature.
Specific examples of the structure include a hydroxyl group-containing terminal hydroxyl group dimethylpolysiloxane (m = 20,000 n = 4), a hydroxyl group-containing terminal hydroxyl group methylphenyl polysiloxane (m = 3,000 n = 3), a hydroxyl group-containing terminal hydroxyl group and a methyl group dimethylpolysiloxane. (M = 5,000 n = 10), terminal hydroxyl group dimethylpolysiloxane (m = 3,000 n = 0), and the like.

  The blending amount of the polymer silicone is 0.01% by mass or more and 20.0% by mass or less, and preferably 0.1% by mass or more and 10.0% by mass or less with respect to the total amount of the skin cosmetic. If it is less than 0.01% by mass, a sufficient effect cannot be obtained, and if it exceeds 20.0% by mass, it becomes difficult to dissolve in the skin cosmetic of the present invention.

  In this invention, when mix | blending polymeric silicone with skin cosmetics, it is preferable to melt | dissolve and mix | blend in (B) C8-C16 isoparaffin of low boiling point oil. Of course, it may be blended separately in the skin cosmetic and dissolved in the system. Preferred is (B) an isoparaffin having 12 to 16 carbon atoms, and particularly preferred is isododecane or isohexadecane. As a commercial item, Permethyl 99A (isododecane), Permethyl 101A (isohexadecane), etc. of Presperse, Inc. can be mentioned, for example.

  In the present invention, low boiling point cyclic silicones (for example, octamethylcyclotetrasiloxane, decamethylcyclopentasiloxane, tetradecamethylcyclohexasiloxane, etc.) and low boiling point chain silicones (for example, hexamethyldisiloxane, octamethyltrimethyl, etc.) are used. Siloxane, decamethyltetrasiloxane, hexadecamethylheptasiloxane, etc.) may be appropriately blended.

  (B) The blending amount of the isoparaffin having 8 to 16 carbon atoms is 0.01 mass% or more and 99.99 mass% or less with respect to the total amount of the skin cosmetic, and is blended at a weight ratio of 1 to 5000 times with respect to the polymeric silicone. It is preferable.

  The (C) Na-acryloyldimethyltaurine Na copolymer (C) used as an essential component in the present invention is a microgel thickener and is a known copolymer. As a commercial product, Simulgel EG (SEPPIC) can be used. A preferable blending amount is 0.1% by mass or more and 10.0% by mass or less, and more preferably 0.5% by mass or more and 5.0% by mass or less in the total amount of the skin cosmetic.

  The dosage form of the skin cosmetic of the present invention is arbitrary, and any of solubilization system, emulsification system, powder dispersion system, oil-water two-layer system, oil-water-powder three-layer system, etc. An emulsifying system is preferred. Preferred products are in particular hand creams and sunscreen cosmetics.

  When the skin cosmetic of the present invention is an emulsified cosmetic, either an oil-in-water type or an oil-in-water type can be used as an emulsified form, but it should be prepared so as not to lose the water resistance that is the effect of the present invention. Is desirable. In the case of emulsified cosmetics, an oil phase containing a polymeric silicone is generally emulsified with a nonionic surfactant, a cationic surfactant, an anionic surfactant or a mixture thereof. At this time, a method of preparing an emulsifier composition by preparing a mixture of a surfactant and a water-soluble polyhydric alcohol in advance and then mixing with an oil phase is preferable.

  The water-soluble polyhydric alcohol is a polyhydric alcohol having two or more hydroxyl groups in the molecule. Specific examples include ethylene glycol, propylene glycol, trimethylene glycol, 1,2-butylene glycol, 1,3- Divalent alcohols such as butylene glycol, 1,4-butylene glycol, tetramethylene glycol, 2,3-butylene glycol, pentamethylene glycol, 2-butene-1,4-diol, hexylene glycol, octylene glycol, glycerin , Trivalent alcohols such as trimethylolpropane and 1,2,6-hexanetriol, tetravalent alcohols such as pentaerythritol, pentavalent alcohols such as xylitol, hexavalent alcohols such as sorbitol and mannitol, diethylene glycol, di Propylene glycol, polyethylene Polyol alcohol polymer such as coal, polypropylene glycol, tetraethylene glycol, diglycerin, polyethylene glycol, triglycerin, tetraglycerin, polyglycerin, ethylene glycol monomethyl ether, ethylene glycol monoethyl ether, ethylene glycol monobutyl ether, ethylene glycol mono Divalent compounds such as phenyl ether, ethylene glycol monohexyl ether, ethylene glycol mono 2-methylhexyl ether, ethylene glycol isoamyl ether, ethylene glycol benzyl ether, ethylene glycol isopropyl ether, ethylene glycol dimethyl ether, ethylene glycol diethyl ether, ethylene glycol dibutyl ether Alcohol Alky Ethers, diethylene glycol monomethyl ether, diethylene glycol monoethyl ether, diethylene glycol monobutyl ether, diethylene glycol dimethyl ether, diethylene glycol diethyl ether, diethylene glycol butyl ether, diethylene glycol methyl ethyl ether, triethylene glycol monomethyl ether, triethylene glycol monoethyl ether, propylene glycol monomethyl ether, propylene Dihydric alcohol alkyl such as glycol monoethyl ether, propylene glycol monobutyl ether, propylene glycol isopropyl ether, dipropylene glycol methyl ether, dipropylene glycol ethyl ether, dipropylene glycol butyl ether Ethers, ethylene glycol monomethyl ether acetate, ethylene glycol monoethyl ether acetate, ethylene glycol monobutyl ether acetate, ethylene glycol monophenyl ether acetate, ethylene glycol diazinate, ethylene glycol disuccinate, diethylene glycol monoethyl ether estate, diethylene glycol mono Divalent alcohol ether esters such as butyl ether acetate, propylene glycol monomethyl ether acetate, propylene glycol monoethyl ether acetate, propylene glycol monopropyl ether acetate, propylene glycol monophenyl ether acetate, xyl alcohol, ceralkyl alcohol, batyl alcohol Glycerin monoalkyl ether, sorbitol, maltitol, maltotriose, mannitol, sucrose, erythritol, glucose, fructose, amylolytic sugar, maltose, xylitol, amylolytic sugar reducing alcohol, sugar solids, glycolide, tetrahydrofur Furyl alcohol, POE tetrahydrofurfuryl alcohol, POP butyl ether, POP POE butyl ether, tripolyoxypropylene glycerol ether, POP glycerol ether, POP glycerol ether phosphate, POP POE pentane erythritol ether, etc. The above is arbitrarily selected and used.

Examples of the oil constituting the oil phase of the skin cosmetic of the present invention include the following oils in addition to the above (A) polymer silicone and (B) isoparaffin having 8 to 16 carbon atoms.
For example, avocado oil, camellia oil, turtle oil, macadamia nut oil, corn oil, mink oil, olive oil, rapeseed oil, egg yolk oil, sesame oil, persic oil, wheat germ oil, sasanqua oil, castor oil, flaxseed oil, safflower oil, Liquid oils such as cottonseed oil, eno oil, soybean oil, peanut oil, tea seed oil, kaya oil, rice bran oil, cinnagari oil, Japanese kiri oil, jojoba oil, germ oil, triglycerin, trioctanoic acid glycerin, triisopalmitic acid glycerin Solid oils such as cocoa butter, coconut oil, horse fat, hydrogenated coconut oil, palm oil, beef tallow, sheep fat, palm kernel oil, pork tallow, owl kernel oil, hydrogenated oil, beef leg oil, owl, hydrogenated castor oil, Beeswax, candelilla wax, cotton wax, carnauba wax, bayberry wax, ibotarou, whale wax, montan wax, nukarou, lanolin, kapok wax, vinegar Lanolin, liquid lanolin, sugar cane wax, lanolin fatty acid isopropyl, hexyl laurate, reduced lanolin, jojoba wax, hard lanolin, shellac wax, POE lanolin alcohol ether, POE lanolin alcohol acetate, POE cholesterol ether, lanolin fatty acid polyethylene glycol, POE hydrogenated lanolin Cosmetics such as waxes such as alcohol ethers, hydrocarbons such as liquid paraffin, ozokerite, squalene, pristane, ceresin, squalane, petrolatum, microcrystalline wax, fatty acid oils, alcohols, cetyl octanoate, isopropyl myristate, etc. It is an oil that is commonly used in foods.

  In addition to the above essential components, the skin cosmetics of the present invention, in a quantitative and qualitative range that does not impair the effects of the present invention depending on the purpose, ultraviolet absorbers, antioxidants, antiseptics, anti-inflammatory agents, It is also possible to mix other ingredients such as vitamins and hormones, flavors and the like that are usually blended in cosmetics.

  Next, the present invention will be described more specifically with reference to examples. However, this does not limit the technical scope of the present invention. In the following, “% by weight” means mass% with respect to the total amount of skin cosmetics. First, the evaluation method of the Example mentioned later is demonstrated.

<Stability test>
The skin cosmetic was left in a temperature-controlled room at -10 ° C, 0 ° C, 5 ° C, 30 ° C, 45 ° C for 1 month, and evaluated for color tone, odor and appearance properties.
<Safety criteria>
○: No change Δ: Some change ×: Change <Water resistance test>
Skin cosmetics were applied to the forearms of 25 healthy female panels, washed with water for 1 minute, then evaluated for water resistance during washing according to the following criteria, and judged the water resistance of skin cosmetics. .
<Water resistance criteria>
◎: 20 or more of 25 people recognized water resistance ○: 15 or more of 25 people recognized water resistance △: 10 or more of 25 people recognized water resistance ×: Less than 10 out of 25 people recognized water resistance <use feeling test>
Skin cosmetics are applied to the forearms of 25 healthy women, and the feeling of use associated with the application (good skin familiarity and ease of grasping glass tableware) is evaluated according to the following criteria. Tactile judgment was performed.
<Usage feeling criteria>
Good skin familiarity ◎: More than 20 out of 25 people recognized skin-friendly ○: 15 or more of 25 people less than 20 recognized good skin fit △: 10 or more of 25 people less than 15 ×: Less than 10 out of 25 people recognized good skin fit ◎: 20 or more out of 25 people judged that it was easy to grab glass dishes, and the skin was slippery ○: 15 to 15 out of 25 people judged that it was easy to grab glass dishes, and no slipperiness was found △: 10 to 15 of 25 people grabbed glass tableware Judged that it was easy, and found no skin slip ×: Less than 10 out of 25 people judged that it was easy to grab glass tableware and found no skin slip

  The following table | surface shows the result of having evaluated the O / W type emulsified cosmetics of Examples 1-9 and Comparative Examples 1-4 based on the said reference | standard. In the table, the water-soluble thickener (C) is Na acrylate / acryloyl dimethyl taurine Na copolymer.

[Table 1]
Example 1 Example 2 Example 3 Example 4 Example 5
Glyceryl monomyristate 1.0 1.0 1.0 2.0 2.0
Isopropyl isostearate 1.0 1.0 1.0 1.0 1.0
Isododecane 8.0 20.0 10.0 30.0 30.0
(Presperse, Inc. Permethyl 99A)
Isohexadecane---20.0 20.0
(Presperse, Inc. Permethyl 101A)
Polymer silicone (A) 0.5 20.0 10.0 0.1 0.01
(R ₁ is a methyl group, R ₂ and R ₃ are hydroxyl groups, m = 20,000 and n = 4)
PEG-11
Methyl ether dimethicone 0.5 3.0 3.0 3.0 3.0
(Shin-Etsu Chemical KF-6011)
α-Hydroxycapric acid 2.0 2.0 2.0 2.0 2.0
Water-soluble thickener (C) 2.0 2.0 2.0 2.0 2.0
Glycerin 10.0 10.0 10.0 10.0 10.0
Neutralizing agent Appropriate amount Appropriate amount Appropriate amount Appropriate amount Fragrance Appropriate amount Appropriate amount Appropriate amount Appropriate amount Ion-exchanged water Residue Residue Residue Residue Residual Residue Residual Residue ―――――――――――
Stability evaluation ○ ○ ○ ○ ○
Water resistance evaluation ○ ◎ ◎ ○ ○
Usability evaluation Skin familiarity ◎ ○ ◎ ◎ ○
No skin slipping ◎ ○ ◎ ◎ ○
―――――――――――――――――――――――――――――――――――――――

[Table 2]
Example 6 Example 7 Example 8 Example 9
Glyceryl monomyristate 1.0 1.0 1.0 1.0
Isopropyl isostearate 1.0 1.0 1.0 1.0
Isododecane 1.0 1.0 1.0 1.0
(Presperse, Inc. Permethyl 99A)
Polymer silicone (A) 0.1 0.1 0.1 0.1
(R ₁ is a methyl group, R ₂ and R ₃ are hydroxyl groups, m = 20,000 and n = 4)
PEG-11
Methyl ether dimethicone 1.0 1.0 1.0 1.0
(Shin-Etsu Chemical KF-6011)
α-Hydroxycapric acid 2.0 2.0 2.0 2.0
Water-soluble thickener (C) 0.1 0.5 5.0 10.0
Glycerin 10.0 10.0 10.0 10.0
Neutralizer Appropriate amount Appropriate amount Appropriate amount Appropriate amount Fragrance Appropriate amount Appropriate amount Appropriate amount Ion-exchanged water Residue Residual Residual Residual Residue ―――
Stability evaluation ○ ○ ○ ○
Water resistance evaluation ○ ○ ○ ○
Usability evaluation Good skin familiarity ○ ◎ ◎ ○
No skin slipping ○ ◎ ◎ ○
――――――――――――――――――――――――――――――――――

[Table 3]
Comparative Example 1 Comparative Example 2 Comparative Example 3 Comparative Example 4
Glyceryl monomyristate 1.0 1.0 1.0 1.0
Isopropyl isostearate 1.0 1.0 1.0 1.0
Isododecane 8.0 8.0 0.4 8.0
(Presperse, Inc. Permethyl 99A)
Polymer silicone (A) 0.5-0.5-
(R ₁ is a methyl group, R ₂ and R ₃ are hydroxyl groups, m = 20,000 and n = 4)
Amino-modified polymeric silicone---0.5
(R ₁ and R ₃ are methyl groups,
R ₂ is-(CH ₂ ) ₃ N (CH ₃ ) ₂ ,
m = 5,000 and n = 5)
PEG-11
Methyl ether dimethicone 0.5 0.5 0.5 0.5
(Shin-Etsu Chemical KF-6011)
Liquid paraffin − − 7.6 −
α-Hydroxycapric acid 2.0 2.0 2.0 2.0
Water-soluble thickener (C)-2.0 2.0 2.0
Carboxyvinyl polymer 0.5 − − −
(Noveon, Inc. Carbopol 940)
Glycerin 10.0 10.0 10.0 10.0
Neutralizer Appropriate amount Appropriate amount Appropriate amount Appropriate amount Fragrance Appropriate amount Appropriate amount Appropriate amount Ion-exchanged water Residue Residual Residual Residual Residue ―――――――――
Stability evaluation △ ○ × ○
Water resistance evaluation ○ × − ○
Usability evaluation Skin familiarity △ ○ − △
No skin slipping ○ ○ − △
―――――――――――――――――――――――――――――――――――――――

<Method for dissolving polymer silicone (A)>
The rubber-like polymeric silicone is stirred and dispersed and mixed while heating to isododecane as a solvent. When it was confirmed that no rubbery residue was observed in the solvent, the dissolution process was completed.

<Water-soluble thickener (C): Na acrylate / acryloyldimethyltaurine Na copolymer production method>
7 g (corresponding to 25.7 mol%) of 2-acrylamido-2-methylpropanesulfonic acid was dissolved in 7 ml of pure water, 7 g (corresponding to 73.8 mol%) of acrylic acid was added thereto, and after cooling, N, N′— 0.1 g (equivalent to 0.5 mol%) of methylene bisacrylamide was dissolved. To this was added a solution prepared by dissolving 4.5 g of sodium hydroxide in 13 ml of pure water under cooling, and 0.05 g of potassium persulfate was further added and dissolved. On the other hand, 2 g of sorbitan monostearate was added to 400 ml of n-hexane, and the mixture was heated to 35 ° C. and dissolved in a nitrogen stream, and then the above aqueous solution was gradually added and emulsified with stirring. After heating up to 60 degreeC and making it react for 6 hours, it cooled to room temperature and removed the oil layer by decantation. The aqueous layer was washed several times with 200 ml of n-hexane, and the precipitate was collected and dried under vacuum to obtain a copolymer of the water-soluble thickener (C) used in the present invention.

The manufacturing process of the O / W type emulsified cosmetic is to dissolve the water-soluble ingredients excluding the neutralizing agent in ion-exchanged water with stirring and heat to 75 ° C., and then completely dissolve the polymer silicone in the solvent while heating. After that, add it to the 75 ° C oil phase that has been confirmed to be dissolved, add a neutralizing agent to the aqueous phase just before emulsification, emulsify with a homomixer, cool to 25 ° C with water cooling, and achieve the desired O / W type emulsified makeup. It was to get a fee. However, in Comparative Example 3 only, a lot of non-uniform viscous irregular shaped foreign matters were produced after cooling. It was considered that the high molecular silicone could not be completely dissolved in the oil phase during the cooling process, and was generated. Since Comparative Example 3 had to make a determination to deviate from the stability evaluation immediately after production, the water resistance evaluation and the feel in use evaluation are omitted.
From the result of the said table | surface, it turns out that the skin cosmetics of this invention are excellent in stability and water resistance, and the skin familiarity is good, there is no skin slipperiness, and it is excellent in usability.

Other examples are shown below. The water-soluble thickener (C) is the same copolymer as described above.
[Table 4]
Example 10 Example 11
Glyceryl monomyristate 1.0 1.0
Isopropyl isostearate 1.0 1.0
Isododecane 8.0 8.0
(Presperse, Inc. Permethyl 99A)
Polymer silicone (A) 0.5 −
(R ₁ is methyl group / phenyl group =
100/1, R ₂ and R ₃ are hydroxyl groups, m = 3,000 and n = 3)
Polymer silicone (A) -0.5
(R ₁ is a methyl group, R ₂ is a hydroxyl group,
R ₃ is hydroxyl group / methyl group = 1/1,
m = 5,000 and n = 10)
PEG-11
Methyl ether dimethicone 0.5 0.5
(Shin-Etsu Chemical KF-6011)
α-Hydroxycapric acid 2.0 2.0
Water-soluble thickener (C) 0.5 0.5
Glycerin 10.0 10.0
Neutralizer appropriate amount appropriate amount perfume appropriate amount appropriate amount ion-exchanged water residue residue

[Table 5]
Example 12
Glyceryl monomyristate 1.0
Isopropyl isostearate 1.0
Isododecane 4.0
(Presperse, Inc. Permethyl 99A)
Isohexadecane 4.0
(Presperse, Inc. Permethyl 101A)
Decamethylcyclopentasiloxane −
Hexadecamethylheptasiloxane −
Polymer silicone (A) 0.5
(R ₁ is methyl group / phenyl group =
100/1, R ₂ and R ₃ are hydroxyl groups, m = 3,000 and n = 3)
PEG-11
Methyl ether dimethicone 0.5
(Shin-Etsu Chemical KF-6011)
α-Hydroxycapric acid 2.0
Water-soluble thickener (C) 0.5
Glycerin 10.0
Neutralizer Appropriate amount of perfume Appropriate amount of ion-exchanged water

The O / W type emulsified cosmetics of Examples 10 to 12 manufactured according to the manufacturing method of Example 1 are excellent in stability and water resistance, and excellent in use feeling such as good skin fit and non-slip. It was. Moreover, the Example shown below was also excellent in stability and water resistance, and excellent in the feeling of use such as good skin familiarity and non-slip.

[Table 6]
W / O emulsified cosmetic
Example 15 Example 16
Microcrystalline wax 4.0 4.0
Solid paraffin 2.0 2.0
Beeslow 3.0 3.0
Vaseline 5.0 5.0
Isohexadecane 10.0 10.0
(Presperse, Inc. Permethyl 101A)
Hexadecamethylheptasiloxane 15.0 15.0
Isododecane 20.0 20.0
(Presperse, Inc. Permethyl 99A)
Hexadecyl adipate 5.0 5.0
Polymer silicone (A) 15.0 5.0
(R ₁ is a methyl group, R ₂ and R ₃ are hydroxyl groups, m = 20,000 and n = 4)
PEG-10 Dimethicone 1.5 1.5
(Shin-Etsu Chemical KF-6017)
PEG-11
Methyl ether dimethicone 0.5 0.5
(Shin-Etsu Chemical KF-6011)
Propylene glycol 5.0 5.0
Glycerol monooleate 3.5 3.5
POE (20) sorbitan monooleate 1.0 1.0
Water-soluble thickener (C) * 1 7.0 3.0
Preservative Appropriate amount Appropriate amount Antioxidant Appropriate amount Appropriate amount Fragrance Appropriate amount Appropriate amount Ion-exchanged water Residue Residue * 1 <Method for Producing Water-soluble Thickener (C)>
Add 14.5 g of 2-acrylamido-2-methylpropanesulfonic acid (equivalent to 50.2 mol%), 5 g of acrylic acid (equivalent to 49.8 mol%) and 4.3 x 10 ^-3 g of N, N'-methylenebisacrylamide to 20 ml of pure water. Further, 0.05 g of potassium persulfate was added and dissolved. This solution was dropped into 200 ml of n-hexane under a nitrogen stream and reacted at 60 ° C. overnight. After removing n-hexane by decantation, the remaining precipitate was swelled in methanol, collected, and vacuum-dried to obtain a desired copolymer as a water-soluble thickener.

[Table 7]
Sunscreen cosmetics
Example 17 Example 18
Isododecane 10.0 10.0
(Presperse, Inc. Permethyl 99A)
Octamethylcyclotetrasiloxane 10.0 10.0
Polymer silicone (A) 8.0 −
(R ₁ is a methyl group, R ₃ is a hydroxyl group,
m = 3,000 and n = 0)
High molecular silicone (A) -4.0
(R ₁ is a methyl group, R ₃ and R ₃ are hydroxyl groups,
m = 10,000 and n = 20)
PEG-11
Methyl ether dimethicone 5.0 5.0
(Shin-Etsu Chemical KF-6011)
Liquid paraffin 2.0 2.0
Sorbitan diisostearate 3.0 3.0
Glycerin 3.0 3.0
Fine particle titanium oxide 5.0 5.0
Octyldimethyl PABA 2.0 2.0
4-Methoxy-4'-tert-butyldibenzoylmethane 2.0 2.0
Preservative Appropriate amount Appropriate amount Antioxidant Appropriate amount Appropriate amount Dispersing agent Appropriate amount Appropriate amount Fragrance Appropriate amount Appropriate amount Water-soluble thickener (C) * 1 5.0 1.0
Ion-exchanged water Residue Residue * 1 <Method for producing water-soluble thickener (C)>
Add 14.5 g of 2-acrylamido-2-methylpropanesulfonic acid (equivalent to 50.2 mol%), 5 g of acrylic acid (equivalent to 49.8 mol%) and 4.3 x 10 ^-3 g of N, N'-methylenebisacrylamide to 20 ml of pure water. Further, 0.05 g of potassium persulfate was added and dissolved. This solution was dropped into 200 ml of n-hexane under a nitrogen stream and reacted at 60 ° C. overnight. After removing n-hexane by decantation, the remaining precipitate was swelled in methanol, collected, and vacuum-dried to obtain a desired copolymer as a water-soluble thickener.

According to the present invention, it is possible to provide a skin cosmetic that is well-familiar, has no feeling of slipping, and is extremely excellent in usability. In the skin cosmetic of the present invention, the water-repellent film remaining unfit for the skin makes it slippery when touching glass or ceramic tableware, etc. Since it does not decrease, it is particularly preferably used as a hand cream. Moreover, it is excellent also in stability and water resistance, and especially when used for sunscreen cosmetics, the beach sandals do not slip and become difficult to wear or slip on the surfboard.

Claims (1)

(A) One or more polymer silicones represented by the following general formula (1):

(1)
(R ₁ represents a methyl group or a part thereof represents a phenyl group, R ₂ represents a hydroxyl group, R ₃ represents a hydroxyl group or a part thereof represents a methyl group, and m and n are m + n of 3,000 to 20,000. And an integer satisfying the condition that n / m is 0 or more and 1/500 or less)
(B) isododecane and / or isohexadecane ;
(C) Na acrylate / acryloyl dimethyl taurine Na copolymer ;
(D) contains water ,
(B) The skin emulsified cosmetic , wherein the blending amount of isododecane and / or isohexadecane is 1 to 5000 times the weight ratio of (A) the polymeric silicone .