JPH0552807B2 - - Google Patents

Description

[Detailed description of the invention]

[Industrial Application Field] The present invention provides a water-in-oil emulsified cosmetic, more specifically, a water-in-oil emulsified cosmetic comprising a specific emulsifier mixture, an oily base containing silicone oil, and water, which has an excellent feel in use, is highly safe, and This invention relates to a milky water-in-oil emulsion cosmetic with good stability over time. [Prior art and its problems] Conventionally, water-in-oil emulsified cosmetics have higher microbial resistance than oil-in-water emulsified cosmetics, and they also form an oil film on the skin surface to prevent water evaporation, and have water-repellent properties. It is often used in skin care products and makeup products because it has excellent cosmetic properties and does not cause makeup to come off easily. However, the disadvantages of water-in-oil emulsified cosmetics are that
Since the oil phase is a continuous phase, the amount of water that can be stably contained therein is limited, resulting in a strong oily or sticky feel when applied. As a solution to this problem, a water-in-oil cosmetic containing a high water content using a mixed emulsifier such as α-monoglyceryl ether has been disclosed (Japanese Patent Publication No. 60-26366). The entire system was made to have a high viscosity in order to keep a large amount of water stable, and although it did not have an oily or sticky feel, it had the disadvantage of being difficult to spread. On the other hand, silicone oil is known as an oily base with excellent lubricity and water repellency, and volatile silicone in particular has been widely used in recent years because it spreads well when applied and does not easily cause makeup to come off. However, it has the disadvantage that it is extremely difficult to obtain a highly stable water-in-oil emulsion cosmetic based on silicone oil. Therefore, there has been a strong demand for water-in-oil emulsion cosmetics that spread easily, have excellent stability, and contain a large amount of water. [Means for Solving the Problems] As a result of extensive research under these circumstances, the present inventors have developed a water-in-oil emulsified cosmetic containing an oily base containing silicone oil, water, and a specific mixed emulsifier. It was discovered that by reducing the viscosity to a certain level or less, a milky water-in-oil emulsion cosmetic with good stability over time, safety, and a good feel when used can be obtained.
The invention has been completed. A mixed emulsifier (1) consisting of an oily base having a silicone oil content of 50% by weight or more, water, and the following components (1) to (4): General formula (): (In the formula, R ¹ represents a linear or branched alkyl group or alkenyl group having 10 to 24 carbon atoms.)
35% by weight (2) General formula (): (In the formula, R ² is hydrogen or an alkyl group having 1 to 5 carbon atoms, m is 1 to 150, n is 1 to 50, a and b
(represents a number from 0 to 35) 20 to 70% by weight of a dimethylpolysiloxane polyoxyalkylene polymer (3) 1 to 20% by weight of a polyvalent metal salt of a saturated or unsaturated fatty acid having 10 to 22 carbon atoms ( 4) To provide a water-in-oil emulsion cosmetic containing 5 to 50% by weight of an inorganic salt with a solubility in water of 0.2 g/100 g water or more at 20°C and a viscosity of 20,000 cps or less at 25°C. It is. The viscosity of the cosmetic composition of the present invention is a value measured using a B-type viscometer, and if it exceeds 20,000 cps, it will not spread easily and the object of the present invention cannot be achieved. Also, if the viscosity is too low, it will not stick to the skin. For this reason, a range of 2000 to 15000 cps is particularly preferred. The silicone oil used in the present invention may be any silicone oil that is normally used in cosmetics, such as dimethylpolysiloxane, dimethylcyclopolysiloxane, methylphenylpolysiloxane, methylhydrodienepolysiloxane, etc. In order to reduce sexual sensation and sticky feeling, volatile dimethylpolysiloxane, dimethylcyclopolysiloxane, etc. can be exemplified as preferred. These can be used alone or in combination of two or more. In addition, other oily bases include hydrocarbons such as squalane, liquid paraffin, and petrolatum, waxes such as whale wax and carnauba wax,
Examples include ester oils such as jojoba oil, octyldodecyl myristate, and neopentyl glycol dioctoate, natural animal and vegetable oils and fats such as olive oil and macadamia nut oil, and diglycerides. The oil base is preferably blended in an amount of 25 to 45% by weight based on the total amount of the cosmetic. In the present invention, the following components (1) are used as emulsifiers:
A mixed emulsifier consisting of (4) is used. (1) General formula (): (In the formula, R ¹ represents a linear or branched alkyl group or alkenyl group having 10 to 24 carbon atoms.)
35% by weight (2) General formula (): (In the formula, R ² is hydrogen or an alkyl group having 1 to 5 carbon atoms, m is 1 to 150, n is 1 to 50, a and b
(represents a number from 0 to 35) 20 to 70% by weight of a dimethylpolysiloxane polyoxyalkylene polymer (3) 1 to 20% by weight of a polyvalent metal salt of a saturated or unsaturated fatty acid having 10 to 22 carbon atoms ( 4) 5 to 50% by weight of an inorganic salt with a solubility in water of 0.2 g/100 g water or more at 20°C Among the above four components, as the α-monoglyceryl ether of component (1), in the formula (), R ¹ is Straight chain alkyl groups such as lauryl group, myristyl group, cetyl group, stearyl group, eicosyl group, docosyl group; Straight chain alkenyl group such as oleyl group; 5,7,7-trimethyl-2-(1,3,3- trimethylbutyl)
β of octyl group, 2-heptylundecyl group, 2-hexyldecyl group, 2-octyldodecyl group, etc.
Examples include those which are branched alkyl groups having a side chain at the position. Among these, those in which R ¹ is a linear alkenyl group or a branched alkyl group having 16 to 22 carbon atoms are particularly preferred. α-monoglyceryl ether () can be used alone or in combination of two or more types. The dimethylpolysiloxane polyoxyalkylene copolymer of component (2) can be used alone or in combination of two or more types, but in the general formula (),
R ² is hydrogen, m is 20-30, n is 2-5, a is 2-
5, b is 0, R is methyl group, m is 4
-10, n is 1-6, a is 0, and b is 7-13. As specific examples, the former is commercially available from Shin-Etsu Chemical Co., Ltd. under the trade name "Silicone KF-945A," and the latter is commercially available from Nippon Unica Co., Ltd. under the trade name "NUC Silicone FZ-2110." Moreover, the mixing ratio is preferably 2:1 to 1:2. As the polyvalent metal salt of the fatty acid of component (3), those having 12 to 18 carbon atoms are particularly preferable, and examples of such salts include calcium, magnesium, zinc,
Examples include salts such as aluminum, and among these, aluminum salts are particularly preferred. Therefore, among fatty acid polyvalent metal salts, preferred are aluminum monostearate, aluminum distearate,
Examples include aluminum monooleate, aluminum monopalmitate, and aluminum monolaurate. Inorganic salts of component (4) include magnesium sulfate,
Examples include potassium sulfate, sodium sulfate, aluminum sulfate, magnesium nitrate, potassium nitrate, sodium nitrate, aluminum nitrate, magnesium chloride, potassium chloride, sodium chloride, aluminum chloride, and especially magnesium sulfate, potassium sulfate, magnesium chloride, chloride. Potassium and aluminum chloride are preferred. The preferred amount of the emulsifier in the present invention is 1 to 10% by weight based on the total amount of the cosmetic. If it is less than 1% by weight, the water-in-oil emulsion cosmetic of the present invention cannot be stabilized, and if it exceeds 10% by weight, the viscosity of the entire system will be extremely high, and it will be difficult to spread during use, resulting in an oily feeling, It is not preferred as a cosmetic because it gives a sticky feeling. In addition, water can be added in any amount, but in order to have a good feeling of use, that is, less oily or sticky feeling and good spreadability, the total weight of water with other water-soluble solvents must be 34 to 74%. %, particularly preferably 50% by weight or more. Here, other water-soluble solvents refer to lower alcohols or polyols such as ethanol, glycerin, sorbitol, propylene glycol, and 1,3-butylene glycol. The water-in-oil emulsified cosmetic composition of the present invention may further contain 0 to 40% by weight of other components commonly used in cosmetics, as appropriate, within a range that does not impair the effects of the present invention. Other ingredients include powders, moisturizers, intercellular lipids (ceramides, etc.), ultraviolet absorbers, alcohols, chelating agents, PH regulators,
Examples include preservatives, thickeners, pigments, and fragrances. By blending 10 to 40% by weight, preferably 15 to 30% by weight of the powder in cosmetics, a milky lotion foundation can be obtained. Examples of powders include powders commonly used in cosmetics, such as extender pigments such as talc, mica, kaolin, and sericite, inorganic pigments such as titanium oxide, zinc oxide, and iron oxide ultramarine, titanium-mica pearl pigments, and blue 404. Examples include organic pigments such as No. 202, Red No. 202, and Yellow No. 401. In the present invention, one or more of the above powders may be arbitrarily selected and used. Cosmetics to which the present invention is applied include, for example, milky lotions such as milky lotions and body care milky lotions, and liquid foundations. These are prepared from the above ingredients according to conventional methods. [Effect of the invention] As mentioned above, the water-in-oil emulsion cosmetic of the present invention has the following properties:
It has the advantages of conventional water-in-oil emulsion cosmetics, and because it has low viscosity and high water content, it spreads easily, has less oily and sticky feel, and has a long-lasting cosmetic effect. It is an excellent cosmetic product. [Examples] The present invention will be explained in more detail with reference to Examples below, but the present invention is not limited to these Examples. Example 1 An emulsion having the composition shown in Table 1 below was produced, and its emulsion stability, viscosity, and feeling of use were evaluated. The results are shown in Table 2.

【table】

[Table] (Manufacturing method) Add magnesium sulfate, methyl parapene and glycerin to purified water, heat, and heat the water phase to 70°C.
I kept it. On the other hand, the remaining components were dissolved by heating, and this oil phase was also heated to 70°C. Next, the aqueous phase was added to this oil phase and emulsified using an emulsifier. The emulsion was cooled to a final temperature of 30°C using a heat exchanger to obtain a milky lotion (product 1 of the present invention). Comparative products 1, 2, and 3 were obtained in the same manner as in the production of product 1 of the present invention except that the ingredients were changed.

[Table] (1): ○; No separation or aggregation △; Slightly present ×; Yes (2); Value at 25°C measured with a B-type viscometer (Model B8L, manufactured by Tokyo Keiki Co., Ltd.) (3): Practical evaluation by 10 expert panelists ○; 7 or more out of 10 people answered that it was good △; 4 to 6 people answered 〃 ×; 〃 3 or less people answered 〃 As is clear from Table 2 above, this book It can be seen that Invention Product 1 is more stable than Comparative Products 1 to 3, and has a low viscosity, so it spreads well, has less stickiness, and has excellent feel when used, such as makeup retention. Example 2 (Hodaycare emulsion) Oil phase component; Weight % Liquid isoparaffin 3.0 Dimethylpolysiloxane (6cs) 5.0 Octamethylcyclotetrasiloxane 20.0 True spherical polymethylsilsesquioxane 2.0 α-monooleyl glyceryl ether 1.0 Dimethylpolysiloxane poly Oxyalkylene polymer ^* 1.0 Dimethylpolysiloxane polyoxyalkylene polymer ^** 0.5 Aluminum stearate 0.1 Water phase components: Magnesium chloride 0.4 Glycerin 2.0 Methylparaben 0.1 Fragrance 0.1 Ethanol 5.0 Purified water Balance meter 100.0 *: Same as Example 1 * *: In formula (), R ² = CH ₃ , m = 15 to 25, n
=2-4, a=25-35, b=10-20 The above aqueous phase components were heated and mixed and kept at 70°C.
The above oil phase was similarly heated and dissolved and dispersed at 70°C. The above water phase was added to this oil phase and emulsified using an emulsifier. The emulsion was cooled to a final temperature of 30°C using a heat exchanger to obtain a body care emulsion (invention product 2). Example 3 (Hand lotion) Oil phase components: Weight % Liquid paraffin 10.0 Methylphenylpolysiloxane 5.0 Decamethylcyclopentasiloxane 15.0 α-Monoisostearylglyceryl ether 1.0 Dimethylpolysiloxane polyoxyalkylene copolymer ^* 0.5 Dimethylpolysiloxane Siloxane polyoxyalkylene polymer ^** 1.0 Aluminum monooleate 1.0 Water phase components: Potassium sulfate 2.5 Glycerin 10.0 Sorbitol 70% aqueous solution 15.0 Methylparaben 0.1 Fragrance 0.1 Purified water Balance meter 100.0 *: In formula (), R ² = H, m =5~100, n=1
~5, a=7-15, b=0 **: Same as Example 1 Example 4 (Sun care lotion) Oil phase component: Weight % Dimethylpolysiloxane (6cs) 10.0 Decamethylcyclopentasiloxane 20.0 α-mono Palmitooleylglyceryceryl ether 1.0 Dimethylpolysiloxane polyoxyalkylene copolymer ^* 1.0 Dimethylpolysiloxane polyoxyalkylene polymer ^** 1.0 Aluminum monostearate 0.2 Octyl methoxycinnamate 3.0 Oxybenzone 0.5 Water phase components: Potassium chloride 0.7 Glycerin 2.0 1,3-butylene glycol 2.0 Methylparaben 0.1 Fragrance 0.1 Purified water Balance powder component (hydrophobic treatment): Titanium oxide 3.0 Total 100.0 *: In formula (), R ² = H, m = 5 to 15, n = 2
~5, a=2-5, b=0 **: In formula (), ^R2 = _CH3 , m=60-80, n
=3-8, a=15-25, b=25-35 The above aqueous phase components were heated and mixed and kept at 70°C.
The oil phase was similarly heated and dissolved at 70°C, and then the powder component was added and dispersed. The above water phase was added to this oil phase/powder and emulsified using an emulsifier. The emulsion was cooled to a final temperature of 30°C using a heat exchanger to obtain a sun care lotion (invention product 4). Example 5 (Liquid emulsion foundation) Oil phase components: Weight% Squalane 4.0 Dimethylpolysiloxane (6cs) 5.0 Neopentyl glycol dioctoate 3.0 Myristate isostearate diglyceride
2.0 Octamethylcyclotetrasiloxane 12.0 Decamethylcyclopentasiloxane 3.0 α-Monoisostearyl glyceryl ether 1.0 Dimethylpolysiloxane polyoxyalkylene copolymer ^* 1.0 Dimethylpolysiloxane polyoxyalkylene polymer ^** 1.0 Aluminum distearate 0.2 Water phase Ingredients: Magnesium sulfate 0.7 Glycerin 3.0 Methyl paraben 0.1 Fragrance 0.1 Purified water Balance powder ingredients (hydrophobic treatment): Titanium oxide 5.0 Sericite 2.0 Talc 3.0 Red iron oxide 0.4 Iron oxide yellow 0.7 Iron oxide black 0.1 Total 100.0 *: Based on Example 1 Same **: Same as Example 1 A liquid emulsified foundation (Product 5 of the present invention) was obtained in the same manner as in Example 4 except that the above components were used. Inventive products 2 to 5 prepared in Examples 2 to 5 all had a viscosity of 20,000 cps or less, and were water-in-oil emulsion cosmetics with excellent stability and feel in use.

Claims (1)

[Claims] 1. Mixed emulsifier (1) consisting of an oily base having a silicone oil content of 50% by weight or more, water, and the following components (1) to (4): (In the formula, R ¹ represents a linear or branched alkyl group or alkenyl group having 10 to 24 carbon atoms.) α-monoglyceryl ether 15
~35% by weight (2) General formula (): (In the formula, R ² is hydrogen or an alkyl group having 1 to 5 carbon atoms, m is 1 to 150, n is 1 to 50, a and b
(represents a number from 0 to 35) Dimethylpolysiloxane polyoxyalkylene polymer 20 to 70% by weight (3) Polyvalent metal salt of saturated or unsaturated fatty acid having 10 to 22 carbon atoms 1 to 20% by weight ( 4) A water-in-oil emulsion cosmetic containing 5 to 50% by weight of an inorganic salt having a solubility in water of 0.2 g/100 g water or more at 20°C and a viscosity of 20,000 cps or less at 25°C.