JPH02215708A - Water-in-oil type emulsion cosmetic - Google Patents

Abstract

PURPOSE:To obtain the title milky cosmetic having excellent touch in use, high safety, excellent stability with time and viscosity in a specific range, comprising an oil-based base having a silicone oil content in a specific range, water and an emulsifying agent. CONSTITUTION:A water-in-oil type emulsion cosmetic comprising (A) an oil- based base having <50wt.% silicone oil content, (B) an emulsifying agent, preferably a mixed emulsified agent consisting of (i) 15-35wt.% alpha-monoglyceryl shown by the formula (R<1> is 10-24C alkyl or 10-24C alkenyl), (ii) 35-65wt.% nonionic surfactant providing 6.0-10.5 HLB value, (iii) 1-20wt.% polyvalent metallic salt of 10-22C saturated on unsaturated fatty acid and (iv) 5-50wt.% inorganic salt having >=0.2g/100g water solubility in water and (C) water and having <=20,000cps, preferably 2,000-15,000cps viscosity at 25 deg.C. The blending ratio is preferably 25-45wt.% component A and 1-10wt.% component B.

Description

[Detailed description of the invention]

[Industrial Field of Application] The present invention relates to a water-in-oil emulsified cosmetic composition, and more specifically, it is composed of a specific emulsifier mixture, an oily base, and water, has an excellent feel in use, is highly safe ( This invention relates to an emulsion-like water-in-oil emulsion cosmetic that has good stability over time. [Conventional technology and its problems] Conventionally, water-in-oil emulsion cosmetics have less microbial resistance than oil-in-water emulsion cosmetics. It is often used in skin care products and makeup products because it forms an oil film on the skin surface to prevent water evaporation, and it also has excellent water repellency and does not cause makeup to come off easily.However, water-in-oil emulsification A disadvantage of cosmetics is 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 feeling when applied.This problem 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 has a high viscosity in order to keep the water stable, and although it does not have an oily or sticky feel, it has the disadvantage of being difficult to spread. There has been a strong demand for water-in-oil type emulsified cosmetics that contain a large amount of water-in-oil type emulsified cosmetics. [Means for solving the problem] The present inventors have conducted extensive research under these circumstances, and have developed water-in-oil type emulsified cosmetics. By keeping the viscosity below a certain level, and in particular by creating a water-in-oil emulsion by using an oily base and water with a specific emulsifier mixture, an emulsion-like emulsion with good stability over time, safety, and an excellent feel when used. The present invention has been completed based on the discovery that a water-in-oil emulsified cosmetic can be obtained.That is, the present invention comprises an oily base having a silicone oil content of less than 50% by weight, water and an emulsifier, The present invention provides a water-in-oil emulsion cosmetic having a viscosity of 20,000 cps or less.The viscosity of the cosmetic of the present invention at 25°C is 20,000 cps or less.
s or less, which is a value measured with a B-type viscometer. If the viscosity exceeds 20,000 cps, it will not spread well and the object of the present invention cannot be achieved, and if the viscosity is too low, it will not feel good on the skin. Therefore, the viscosity of the cosmetic is particularly preferably in the range of 2000 to 15,000 cps. Examples of the oily base used in the present invention include hydrocarbons such as squalane, fluid IQ rough-in, and petrolatum; Risiloxane, zomethylcyclo? silicone oils such as resiloxane; waxes such as spermaceti wax and carnauba wax; ester oils such as jojoba oil, octyldodecyl myristate, and neopentyl glycol zooctoate; natural animal and vegetable oils such as olive oil and macadamia nut oil; diglycerides, etc. Can be mentioned. These can be used alone or in combination of two or more, and 25
It is preferable to mix it in an amount of 45% by weight. Further, the content of silicone oils in the oily base is less than 50% by weight. If it is 50% by weight or more, a light feel can be obtained, but a squeaky feeling characteristic of silicone oil will appear. Examples of the emulsifier used in the present invention include the following components (
Mixed emulsifiers consisting of 1) to (4) are particularly suitable. (1) a-monoglyceryl ether 15-35 represented by general formula (1) % formula % (1) (in the formula, 11 represents a linear or branched alkyl group or alkenyl group having 10 to 24 carbon atoms) Weight% (2) 35-65% by weight of one or more types of nonionic surfactants that provide an HL B value of 6.0-10.5 (
3) Polyvalent metal salts of saturated or unsaturated fatty acids having 10 to 22 carbon atoms 1 to 20% by weight (4) Inorganic salts with solubility in water of 0.2 g/100f water or more at 20°C 5 to 50% by weight 4 above Among the components, the α-monoglyceryl ether of component (1) is a straight-chain alkyl group such as a lauryl group, myristyl group, cetyl group, stearyl group, eicosyl group, or tocosyl group; Straight chain alkenyl groups such as groups: 5, 7
．． Branched alkyl having a side chain at the β position such as 7-dolimethyl-2-(1,3,3-trimethylbutyl)octyl group, 2-hebutylundecyl group, 2-hexyldecyl group, 2-octyldotecyl group Examples include those that are bases. Among these, those in which Hl is a linear alkenyl group or a branched alkyl group having 16 to 22 carbon atoms are particularly preferred. a
- Monoglyceryl ether (1) can be used alone or in combination of two or more. The nonionic surfactant (excluding a-monoglyceryl ether) as component (2) is one that alone gives an HLB (hydrophilic-hydrophobic balance) value of 6.0 to 10.5, or Even if the surfactant has a value outside the range of 6.0 to 10.5, HL can be improved by combining two or more types.
It can be used if the B value is 6.0 to 10.5. In this case, the HLB value of the mixture can be determined as a weighted average. Table 1 shows specific examples. What is the POE in the margin table below in Table 1? The number in parentheses indicates the average number of moles added in the case of POE. In the case of lyethylene glycol, the average molecular weight is shown. The polyvalent metal salt of the fatty acid of component (3) is preferably one having 12 to 18 carbon atoms, and examples of these salts include calcium, magnesium, zinc, aluminum, etc., among others! Aluminum salts are preferred. Therefore, preferred examples of fatty acid polyvalent metal salts include aluminum monostearate, aluminum cystearate, aluminum monooleate, aluminum heptamebalmitate, and aluminum monolaurate. Examples of the inorganic salt of component (4) include magnesium sulfate, potassium sulfate, sodium sulfate, aluminum sulfate,
Examples include magnesium nitrate, potassium nitrate, sodium nitrate, aluminum nitrate, magnesium chloride, potassium chloride, thorium chloride, aluminum chloride, among others,
Particularly preferred are magnesium sulfate, potassium sulfate, magnesium chloride, potassium chloride and aluminum chloride. 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 the weight is less than 1%, the water-in-oil emulsion cosmetic of the present invention cannot be stabilized;
If the amount exceeds 0% by weight, the viscosity of the entire system becomes extremely high, it is difficult to spread during use, and gives an oily or sticky feel, which is not preferable as a cosmetic. 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, it is necessary to add 34 to 74% water by weight in total with other water-soluble solvents. %, particularly preferably 50% by weight or more. Here, other water-soluble solvents include ethanol, glycerin, sorbitol, zoropylene glycol, 1.
Lower alcohols such as 3-butylene glycol or? It means Riolu. 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 long as the effects of the present invention are not impaired. Examples of other components include powders, humectants, intercellular lipids (ceramides, etc.), ultraviolet absorbers, alcohols, chelating agents, pH adjusters, preservatives, thickeners, pigments, fragrances, and the like. By blending 10 to 401 times, preferably 15 to 30 times, of the powder into a cosmetic, a milky lotion foundation can be obtained. As a powder,
Powders commonly used in cosmetics, for example, extender pigments such as talc, mica, kaolin, and sericite; inorganic pigments such as titanium oxide, zinc oxide, and iron oxide ultramarine; titanium-mica type 9
- color pigment and blue No. 404, red No. 202, yellow 4 ()
Organic pigments such as No. 1 can be mentioned. 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 Lotion and Zedaycare Milky Lotion, and liquid type foundations. These are prepared from the above ingredients according to conventional methods. [Effects of the Invention] As described above, the water-in-oil emulsified cosmetic of the present invention has the advantages of conventional water-in-oil emulsified cosmetics, and is a cosmetic that has low viscosity and high water content. Because of this, it has good growth (
It is a cosmetic with little oily or sticky feel, excellent long-lasting cosmetic effect, and good stability. [Example] The present invention will be explained in more detail with reference to Examples below.
The present invention is not limited to these examples. Example 1 A milky lotion having the composition shown in Table 2 was produced, and its emulsion stability, viscosity, and feeling in use were evaluated. The results are shown in Table 3. <Production method> Magnesium sulfate, methyl 9-pen, and glycerin were added to purified water and heated, and the aqueous phase was maintained at 70°C. On the other hand, the remaining components were dissolved by heating, and the oil phase was also heated to 70°C. Next, add the above water phase to this oil phase and put it into an emulsifier.

[Emulsified. The emulsion was cooled to 30°C using a heat exchanger to obtain a milky lotion (product 1 of the present invention). Comparative products were also prepared in the same manner as inventive product 1 except that the ingredients were changed]
, 2, and 3 were obtained. Margins below 1) CO: No separation or aggregation Δ; Slightly present Practical evaluation Q: 7 or more out of 10 people answered Δ; 4 to 6 people answered ×; 3 or less people answered as clear from Table 3. As is clear from Table 3, inventive product 1 was lower than comparative products 1 to 3. It has good stability and low viscosity, so it spreads easily.
It can be seen that the product is less sticky and has an excellent feel when used, such as makeup retention. Example 2 (Medicare emulsion) Oil phase component = (weight S>1
) Fluid IsonoQ Rough-in 3.0
2) Squalane 2α03)
Octamethylcyclotetrasiloxane 5.04
) true spherical, T1e remethylsilsesquioxane
2h05) α-monooleyl glyceryl ether
1.06)-Lioxyethylene (20) Hardening and Mustard Oil (HLBlo, 5) 1.0 7) Aluminum Monostearate Water Phase Components: 8) Magnesium Chloride 9) Glycerin 10) Methylnoqrapene U) Perfume Gong Ethanol 0.1 Total 100.0 The above aqueous phase components were heated and mixed and maintained 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 Medicare emulsion (Product 2 of the present invention). Example 3 (hand lotion) Oil phase component = (wt%) 1
) Fluid No. 9 Rough-in 10.0
2) Squalane 113) Decamethylcyclopenta70xane 4) α-Monoisostearyl glyceryl ether 5.0 1.0 1.0 1.0 6) Glyceryl monostearate (HLB3.5)'7
) Aluminum monooleate aqueous phase components: 8) Potassium sulfate 9) Glycerin 10) Sorbitol 70% aqueous solution 11) Methylnolaben 12) Fragrance 13) Purified water 2.5 10.0 15.0 Oll 0.1 Balance meter 100 A hand lotion (product 3 of the present invention) was obtained in the same manner as in Example 2 except that the above components were used. Example 4 (sun care lotion) Oil phase component = (wt%)l
) Fluid Noq Rough-in 2α02)
Decamethylcyclopentasiloxane 10
．． 03) a-7nonoQ lumitooleyl glyceryl ether 1.04)/lioxyethylene (60) [castor oil LO (HLB14.0)" 5) Glycerin monooleate (HLBZ8)"
1.06) Aluminum monostearate
α27) Octyl Metkincinnamate
108) Oxybenzone
α5 water phase component: 9) Potassium chloride 0.710
) Glycerin 2011) 1
, 3-butylene glycol 2012) Methylnoqrapen α113) Fragrance
0.114) Purified water
Balance powder component (hydrophobic treatment): 15) Titanium hydride &0 total 100.0 +1 = HLB when component 4) and component 5) are mixed is &
The above aqueous phase components No. 4 were heated and mixed and maintained 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. Finishing the emulsion with a heat exchanger 3
It was cooled to 0°C to obtain a sun care lotion (product 4 of the present invention). Example 5 (Liquid emulsion foundation) Oil phase component =
(M amount%) 1) Squalane
4.02) 1-9 Roughin 7.03) Neopentyl glycol zooctanoate 3.04) Myristic acid isostearic acid cydariceride 2.05)
Octamethylfucrotetrasiloxane 10
．． 06) Decamethylcyclopentasiloxane
3.07) a-Monoisostearylglyceryl ether 1.08)-Lioxyethylene (60)
Hydrogenated castor oil 1.0 (HLB 14.O)” 9) Sorbitan sesquiisostearate (HLB 4.5
)”t,. 10) Aluminum cystearate 0.2 Water phase acid content: 11) Magnesium sulfate 0.71
2) Glycerin λ013) MeCQ Laben α114) Fragrance
0.115) Purified water Balance powder component (hydrophobic treatment): 16) Titanium oxide 5.01
7) Sericite 20
18) Talc 3.0
19) Red Garla 0.4
20) Iron oxide yellow 0.72
1) Iron oxide black 0.1 total
100.0 Australia: HLB when mixing component 8) and component 9) is 9.3 A liquid emulsion foundation (product of the present invention 5) was obtained in the same manner as in Example 4 except for using the above components. . Inventive products 2 to 5 prepared in Examples 2 to 5 all have a viscosity of 20,000 cps or less and are stable. It was a water-in-oil emulsion cosmetic with an excellent feel when used. that's all

Claims (1)

[Scope of Claims] 1. An oily base having a silicone oil content of less than 50% by weight;
Contains water and emulsifier, viscosity at 25°C is 20,
A milky water-in-oil emulsion cosmetic having a concentration of 000 cps or less. 2. The emulsifier has the following components (1) to (4) (1) General formula (I) ▲There are mathematical formulas, chemical formulas, tables, etc.▼(I) (In the formula, R^1 is a carbon number of 10 to 24 15 to 35% by weight of α-monoglyceryl ether (representing a linear or branched alkyl group or alkenyl group) (2) One or two types of nonionic surfactants that give an HLB of 6.0 to 10.5 35 to 65% by weight (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) Solubility in water is 0.2g/100g at 20℃
The water-in-oil emulsified cosmetic according to claim 1, which is a mixed emulsifier consisting of 5 to 50% by weight of an inorganic salt of water or more.