JP2012116757A - Low-viscosity w/o emulsion composition - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a W/O emulsion composition which contains plate-shaped particles of an organically modified clay mineral and which has a low viscosity and does not suffer from separation even at high temperature.SOLUTION: The W/O emulsion composition is characterized by including (A) plate-shaped particles of an organically modified clay mineral which have a mean thickness of 0.1 μm or less and a mean major axis of 0.5 to 50 μm and (B) a branched-chain silicone which is co-modified with both polyoxyalkylene and alkyl, and having a viscosity of 10,000 mPa s or less. Further, the viscosity stability of the W/O emulsion composition after the lapse of time can be improved by adding (C) a glycerol which is modified with a silicone at both terminals.

Description

  The present invention relates to a W / O emulsion composition, and particularly to a low-viscosity W / O emulsion composition that does not separate due to high-temperature storage.

W / O emulsion compositions are widely used in cosmetics, especially makeup cosmetics such as foundations and sunscreen cosmetics because they have a long lasting makeup compared to O / W emulsion compositions.
Recently, makeup cosmetics and sunscreen cosmetics are often required to have low viscosity in terms of feeling of use. However, when the viscosity is lowered in the emulsion composition, the emulsion stability tends to decrease.

  In Patent Document 1, a commercially available organically modified clay mineral, which is usually an aggregate having an average thickness of 2 μm or more, is exfoliated by mechanical shearing force and / or impact force using bead mill or paint shaker in oil such as silicone oil. By doing so, a high dispersion in which fine plate-like particles having an average thickness of 0.1 μm or less and an average major axis of 0.5 to 50 μm are dispersed can be obtained. If a surfactant is used in combination, the oil phase is remarkably thickened, and a W / O emulsion composition having excellent emulsion stability can be obtained. Further, if an oil having a COOH group and / or OH group is used in combination, emulsion stability is obtained. It is described that the viscosity of the W / O emulsion composition can be reduced without impairing the viscosity.

  However, even in such a W / O emulsion composition, separation may occur when stored at a high temperature.

JP 2009-40720 A

  The present invention has been made in view of the background art described above, and its purpose is to achieve low-viscosity and high-temperature separation in a W / O emulsion composition using organically modified clay mineral plate-like particles as described above. The object is to provide a suppressed W / O emulsion composition.

  As a result of intensive studies by the present inventors in order to achieve the above-mentioned problems, in the W / O emulsion composition using the organically modified clay mineral plate-like particles, when a specific silicone surfactant is used, at a high temperature It was found that a low-viscosity W / O emulsified composition in which the separation of was specifically suppressed was obtained. Moreover, when powder was mix | blended with such a W / O emulsion composition, it discovered that it was excellent also in the dispersion stability of powder. In addition, it has been found that when both ends of the silicone-modified glycerin are used in combination, the viscosity stability over time is improved, and the present invention has been completed.

That is, the W / O emulsion composition according to the present invention is
(A) an organically modified clay mineral which is a plate-like particle having an average thickness of 0.1 μm or less and an average major axis of 0.5 to 50 μm;
(B) a polyoxyalkylene / alkyl co-modified branched silicone;
Containing
The viscosity is 10,000 mPa · s or less.
In the W / O emulsion composition according to the present invention, (B) the polyoxyalkylene / alkyl co-modified branched silicone is 1.5% by mass or more in the W / O emulsion composition. A / O emulsified composition is provided.

Moreover, this invention provides the W / O emulsion composition in any one of the said W / O emulsion compositions characterized by containing (C) both terminal silicone-ized glycerin further.
In the W / O emulsified composition, the present invention is such that (C) both-ends siliconeized glycerin is 0.5 times mass or more with respect to (B) polyoxyalkylene / alkyl co-modified branched silicone. A W / O emulsion composition is provided.
In addition, the present invention provides the W / O emulsion composition according to any one of the above, wherein the oil phase contains silicone oil.
In addition, the present invention provides the W / O emulsion composition according to any one of the above, further comprising a powder.

  According to the present invention, in a W / O emulsified composition using organically modified clay mineral plate-like particles, by using a polyoxyalkylene / alkyl co-modified branched silicone, a low viscosity excellent in emulsion stability at high temperatures. W / O emulsion composition can be obtained. Moreover, when the powder is mix | blended with the W / O emulsion composition, it is excellent also in the dispersion stability of a powder. Furthermore, if both terminal silicone glycerin is used together, the viscosity stability over time can be improved.

(A) Organically modified clay mineral plate-like particles The organically modified clay mineral refers to an exchangeable cation between layers of a water-swellable clay mineral (for example, montmorillonite, smectite, hectorite, bentonite, etc.). For example, it is ion-exchanged with a quaternary ammonium salt type cationic surfactant). Specifically, dimethyl distearyl ammonium hectorite (= quaternium-18 hectorite), dimethyl distearyl ammonium bentonite (= quaternium-18 bentonite), benzyl dimethyl stearyl ammonium hectorite, dioctadecyl dimethyl ammonium montmorillonite, octadecyl dimethyl benzyl Examples thereof include ammonium montmorillonite and dihexadecyldimethylammonium montmorillonite.

  Examples of the organically modified clay mineral include “Benton 38” (= quaternium-18 hectorite), “Benton 34” (= quaternium-18 bentonite), “Benton 27” (= benzyldimethyldistearylammonium hectorite) ), “Claytone 40”, “Claytone SO” (all manufactured by Southern Clay), etc., and are commercially available. One or more organically modified clay minerals can be used.

  The organically modified clay mineral used in the present invention is an organically modified clay mineral that is a plate-like particle having an average thickness of 0.1 μm or less and an average major axis of 0.5 to 50 μm. The organically modified clay mineral plate-like particles form a film wall of the emulsified particles of the W / O emulsified composition and contribute to stabilization of the emulsification.

  Such organically modified clay mineral plate-like particles can be obtained by the method described in Patent Document 1, for example. In other words, commercially available organically modified clay minerals are usually aggregates having an average thickness of 2 μm or more, but the average thickness can be obtained by exfoliating with mechanical shearing force and / or impact force using bead mill or the like in oil. High dispersion in which organically modified clay mineral plate-like particles having a thickness of 0.1 μm or less and an average major axis of 0.5 to 50 μm are dispersed (an oily dispersion in which organically modified clay mineral plate-like particles exist independently as single particles) ) Can be obtained. For example, it can be performed by the following method.

(Preparation of highly organically modified clay mineral dispersion)
Add a glass bead (or zirconia bead, etc.) with the same volume to a mixture of a commercially available organically modified clay mineral (usually an aggregate having a layered structure with an average thickness of 2 μm or more) and oil, and paint. Using a shaker (Asada Tekko Co., Ltd.), a bead mill (DISPERMAT, VMA-GETZMANN GMBH Verfahrenstechnik), etc., by applying a mechanical shearing force and / or impact force, it is exfoliated and thinned, with an average thickness of 0.1 μm or less. A high dispersion of organically modified clay mineral plate-like particles having an average major axis of 0.5 to 50 μm is obtained.

The average thickness and average major axis of the organically modified clay mineral contained in the organically modified clay mineral high dispersion can be determined, for example, by the following measuring method.
(Measuring method)
-Average thickness A sample obtained by sufficiently diluting a highly dispersed organically modified clay mineral with silicone oil and drying the diluted solution is measured using a scanning electron microscope (S-4500, manufactured by Hitachi High-Technologies Corporation).
-Average long diameter A highly dispersed organically modified clay mineral is sufficiently diluted with silicone oil and measured using a particle size distribution analyzer (Microtrac VSR, manufactured by Nikkiso Co., Ltd.).
The shape of the organically modified clay mineral is determined by an SEM photograph.

The high dispersion once obtained can maintain a good dispersion state without agglomeration again in an oil phase such as silicone oil. If the agglomerates are not sufficiently peeled and the thickness remains large, the effect is not sufficiently exhibited.
The peeling treatment as described above can be carried out in the presence of a polyoxyalkylene / alkyl co-modified branched silicone or a both-end silicone-modified glycerin, which will be described later, but is preferably carried out in the absence thereof.

The concentration of the organically modified clay mineral in preparing the high dispersion is not particularly limited, but is preferably 0.25 to 35% by mass. If the amount is too large, peeling treatment may be difficult.
In the W / O emulsion composition of the present invention, the organically modified clay mineral having a plate-like particle structure is usually blended in an amount of 0.1% by mass or more, preferably 0.5% by mass or more. If the amount is too small, the stability of the W / O emulsion composition may be insufficient. On the other hand, even if added excessively, the improvement corresponding to the effect cannot be obtained and the viscosity becomes high. Therefore, it is usually 3% by mass or less, preferably 1.5% by mass or less in the W / O emulsion composition. .

  The oil component used for exfoliation treatment of the organic modified clay mineral is not particularly limited. It is possible to use one or two or more oils that are usually blended in cosmetics, pharmaceuticals, etc., but it is preferable that the oil is a liquid oil at room temperature (20 ° C.) as a whole. In particular, silicone oil is preferably used.

The silicone oil is not particularly limited as long as it is generally used in cosmetics. Specifically, for example, chain polysiloxanes such as dimethylpolysiloxane and methylphenylpolysiloxane, cyclic polysiloxanes such as octamethylcyclotetrasiloxane, decamethylcyclopentasiloxane, and dodecamethylcyclohexasiloxane, and other problems Unless otherwise, silicone resins forming a three-dimensional network structure, various silicone rubber polysiloxanes (amino-modified polysiloxane, alkyl-modified polysiloxane, fluorine-modified polysiloxane, etc.) and the like can be mentioned.
In the present invention, one or more silicone oils can be selected and used.

The organically modified clay mineral having a plate-like particle structure of the present invention can be favorably dispersed particularly in an oil component mainly composed of silicone oil, and in a W / O emulsion composition mainly composed of silicone oil. Can also exhibit an excellent emulsifying action. In addition, the use of silicone oil is preferred from the point of view of use. Among the silicone oils, low viscosity silicone oils (for example, the viscosity at 25 ° C. is 20 mPa · s or less, more preferably 10 mPa · s) are preferable.
The silicone oil is preferably blended in the oil phase by 50% by mass or more, more preferably 80% by mass or more, and particularly preferably 90% by mass or more.

(B) Polyoxyalkylene / alkyl co-modified branched silicone The polyoxyalkylene / alkyl co-modified branched silicone used in the present invention has an organopolysiloxane as the main skeleton, a polyoxyalkylene group in the side chain, and 2 carbon atoms. It has the above alkyl group and organopolysiloxane group, for example, what is shown by the following general formula (I) is mentioned.

Formula (I):

  In the general formula (I), R is an alkyl group having 1 to 3 carbon atoms or a phenyl group; R ′ is hydrogen or an alkyl group having 1 to 12 carbon atoms; p, p ′ and p ″ are each an integer of 1 to 50; m and a are each an integer of 1 to 100; n, q, x, and z are each an integer of 1 to 50; y is an integer of 0 to 50.

R is preferably an alkyl group having 1 to 3 carbon atoms, more preferably a methyl group.
R ′ is preferably hydrogen.
p is preferably 1 to 5, more preferably 1 to 3.
p ′ is preferably 7 to 17, more preferably 9 to 15.
p ″ is preferably 1 to 10, more preferably 2 to 5.
m is preferably 20 to 60, and more preferably 30 to 50.
a is preferably 1 to 20, more preferably 3 to 12.
n is preferably 1 to 10, and more preferably 1 to 4.
q is preferably 1-20, more preferably 10-15.
x is preferably 1 to 20, and more preferably 7 to 13.
z is preferably 1 to 10, more preferably 1 to 3.
y is preferably 0 to 5, and more preferably 0.

  As a suitable example of the polyoxyalkylene alkyl co-modified branched silicone of the general formula (I), KF-6038 (lauryl PEG-9 polydimethylsiloxyethyl dimethicone, manufactured by Shin-Etsu Chemical Co., Ltd.) can be mentioned. .

  If organically modified clay mineral plate-like particles and a nonionic surfactant are used, a W / O emulsion composition with high emulsification stability can be obtained, but separation may occur due to high-temperature storage. Such separation at high temperature is specifically suppressed by the polyoxyalkylene / alkyl co-modified branched silicone. Separation of liquid phase by high-temperature storage even when other silicone surfactants such as polyoxyalkylene / alkyl co-modified linear silicone and polyoxyalkylene-modified silicone are used instead of polyoxyalkylene / alkyl co-modified branched silicone It is difficult to suppress this.

  Such separation at high temperature is likely to occur with a low-viscosity W / O emulsion composition (for example, 10,000 mPa · s or less). Therefore, the effect of the polyoxyalkylene / alkyl co-modified branched silicone is useful for such a low-viscosity W / O emulsion composition, particularly when the viscosity is 5,000 mPa · s or less.

  The polyoxyalkylene / alkyl co-modified branched silicone is preferably blended in an amount of 1.5% by mass or more, more preferably 2% by mass or more in the W / O emulsion composition. If there are few compounding quantities, the effect may not fully be exhibited. The upper limit of the blending amount is not particularly limited, but even if it is excessively blended, an improvement corresponding to the effect cannot be obtained. Therefore, it is preferably 5% by mass or less, more preferably 4% by mass or less in the W / O emulsion composition. is there.

(C) Both-end siliconeized glycerin The both-end siliconeized glycerin used in the present invention is one in which hydrogen atoms of both OH groups of glycerin or polyglycerin are substituted with organopolysiloxyalkyl groups. What is shown by (II) is mentioned.

General formula (II):

In general formula (II), R ¹ is each independently a linear or branched alkyl group having 1 to 12 carbon atoms or a phenyl group, and R ² is each independently an alkylene group having 2 to 11 carbon atoms. , M are each independently 10-120, and n is 1-11.
The basic structure of both terminal silicone glycerin is a BAB type triblock copolymer.

R ¹ is preferably a methyl group or a phenyl group, more preferably a methyl group.
R ¹ ′ is preferably an alkyl group having 1 to 8 carbon atoms, and more preferably an alkyl group having 3 to 6 carbon atoms.
R ² is preferably an alkylene group having 2 to 6 carbon atoms, more preferably 2 to 4 carbon atoms.
m is preferably 40 to 80, more preferably 50 to 70, independently of each other.
n is preferably 1 to 5, more preferably 2 to 4.

When both ends of the silicone-modified glycerin are used in combination with a polyoxyalkylene / alkyl co-modified branched silicone, the viscosity stability over time is improved.
The effect of both ends silicone-modified glycerin is usually 0.1 times mass or more, more preferably 0.5 times mass or more, preferably 2 times that of polyoxyalkylene / alkyl co-modified branched silicone. It is more than mass. On the other hand, since an improvement corresponding to the effect cannot be obtained even if incorporated excessively, the both-end siliconeized glycerin is usually 5 times mass or less, preferably 3 times the polyoxyalkylene / alkyl co-modified branched silicone. Less than double mass.

W / O Emulsion Composition In the W / O emulsion composition according to the present invention, water and a water-soluble component are blended as the aqueous phase.
On the other hand, the oil phase is mixed with the above-mentioned organically modified clay mineral plate-like particles (or a highly dispersed product thereof) and polyoxyalkylene / alkyl co-modified branched silicone, and further, both-end silicone-modified glycerin and other oil-based materials Ingredients can be blended.

  In the W / O type emulsion composition, the ratio of water phase: oil phase is preferably 1: 0.5 to 1: 1.5, more preferably 1: 1 to 1: 1.3. If the ratio of water phase: oil phase is out of the above range, it may be difficult to prepare a low viscosity W / O emulsion composition.

  The W / O emulsion composition of the present invention can be produced by a conventional method. For example, it can be obtained by emulsifying by adding an aqueous phase to an oil phase containing the above highly dispersed organically modified clay mineral, polyoxyalkylene / alkyl co-modified branched silicone, and further, siliconized glycerin at both ends. In the case of blending powder components such as pigments, spherical powders, inorganic ultraviolet protective agents, etc., they are blended by a conventional method. For example, the powder may be dispersed in advance in an oil phase or an aqueous phase and then emulsified. The W / O emulsified composition of the present invention in which organically modified clay mineral plate-like particles and polyoxyalkylene / alkyl-modified branched silicone are blended is also excellent in powder dispersion stability, and color caused by powder aggregation or precipitation. Does not cause blemishes. Although the compounding quantity of a powder is not restrict | limited in particular, Usually, 0.01-50 mass% is mix | blended in a W / O emulsion composition, Preferably it is 1-40 mass%, More preferably, it is 5-30 mass%.

In the W / O type emulsion composition according to the present invention, other components generally used in pharmaceuticals, quasi drugs, cosmetics and the like are appropriately added as necessary within the range in which the effects of the present invention are not impaired. It is also possible to mix.
For example, oil, chemicals, various surfactants, inorganic powders, organic powders, pigments, dyes, moisturizers, whitening agents, UV inhibitors, thickeners, metal sequestering agents, various water-soluble polymers, pH adjusters, oxidation Examples include inhibitors and preservatives. As the powder component, a hydrophobized or hydrophilized product can be used.

In the present invention, silicone oil is suitable as the oil, but other oils can be blended.
Examples of other oils include hydrocarbon oils, ester oils, vegetable oils, animal oils, higher alcohols, and higher fatty acids. In addition, it is preferable that these oil components melt | dissolve in silicone oil and become a uniform liquid state at normal temperature (20 degreeC) as a whole.

  Examples of the hydrocarbon oil include liquid paraffin, paraffin, squalane, squalene, ozokerite, pristane, ceresin, petrolatum, and microcrystalline wax.

  Ester oils include isopropyl myristate, cetyl octanoate, octyldodecyl myristate, isopropyl palmitate, butyl stearate, hexyl laurate, myristyl myristate, decyl oleate, hexyl decyl dimethyloctanoate, cetyl lactate, myristyl lactate, Lanolin acetate, isocetyl stearate, isocetyl isostearate, cholesteryl 12-hydroxystearate, ethylene glycol di2-ethylhexanoate, dipentaerythritol fatty acid ester, monoisostearic acid N-alkyl glycol, dicapric acid neopentyl glycol, malic acid diacid Isostearyl, glycerin di-2-heptylundecanoate, trimethylolpropane tri-2-ethylhexanoate, triisostearate Methylolpropane, glyceryl trioctanoate, glyceryl triisopalmitate, trimethylolpropane triisostearate, cetyl 2-ethylhexanoate, pentaerythritol tetra-2-ethylhexanoate, glycerin tri-2-ethylhexanoate, 2-ethylhexyl palmitate Glyceryl trimyristate, glyceride tri-2-heptylundecanoate, castor oil fatty acid methyl ester, oleyl oleate, acetoglyceride, 2-heptylundecyl palmitate, diisobutyl adipate, N-lauroyl-L-glutamate-2-octyl Dodecyl ester, di-2-heptylundecyl adipate, ethyl laurate, di-2-ethylhexyl sebacate, 2-hexyldecyl myristate, palmiti 2-hexyl decyl, 2-hexyldecyl adipate, diisopropyl sebacate, 2-ethylhexyl succinate, and triethyl citrate.

Examples of vegetable oils include avocado oil, camellia oil, macadamia nut oil, corn oil, olive oil, rapeseed oil, sesame oil, castor oil, peanut oil, almond oil, soybean oil, tea seed oil, jojoba oil, germ oil, etc. .
Animal fats and oils include turtle oil, egg yolk oil, mink oil and the like.
Examples of higher alcohols include oleyl alcohol, isostearyl alcohol, octyldodecanol, decyltetradecanol, jojoba alcohol, cetyl alcohol, and myristyl alcohol, and examples of higher fatty acids include oleic acid, isostearic acid, linoleic acid, linolenic acid, and ethanol. Examples include icosapentaenoic acid, docosahexaenoic acid, palmitic acid, and stearic acid.

  The W / O emulsified composition according to the present invention can be suitably used as an external preparation for skin applied to skin and hair. For example, skin care cosmetics such as emulsions, creams, cleaning agents, packs, and cosmetics for massage. Makeup cosmetics such as foundation, lipstick, blusher, eyeliner and eye shadow; sunscreen cosmetics; hair cosmetics such as hair treatments and hair styling. In particular, since the W / O emulsion composition of the present invention is excellent in powder dispersion stability, it is suitable for cosmetics containing powders such as makeup cosmetics such as foundations and sunscreen cosmetics.

  EXAMPLES Hereinafter, although this invention is further demonstrated based on an Example, this invention is not limited to this. The blending amount is mass% unless otherwise specified. The test methods used in the test examples are as follows.

(viscosity)
After leaving still in a 30 degreeC thermostat for 1 hour, it measured on the conditions of 12 rpm using a single cylinder type rotational viscometer (Shibaura System Co., Ltd.) (rotor No. 3 or No. 4).

(appearance)
The sample was preserve | saved on each condition, and the external appearance change was visually evaluated according to the following evaluation criteria.
○: No separation of liquid phase is observed.
Δ: Some separation of the liquid phase is observed.
X: Separation of the liquid phase is observed.

(Rolling test)
The dispersion stability of the powder was examined by a rolling test. About 30 ml of sample is put into a 50 ml screw tube (3 cm in diameter), and the sample is closed, rotated for 4 hours at 20 ° C. and 45 rpm, and a rolling test is performed. did.
○: Color stripes (yellow stripes and red irregularities) are not recognized.
Δ: Color stripes (yellow streaks and red irregularities) are slightly observed.
X: Color stripes (yellow stripes and red irregularities) are observed.

Test Example 1 Effect of polyoxyalkylene / alkyl co-modified branched silicone A W / O emulsion composition having a viscosity of about 3,000 to 7,000 mPa · s was prepared according to the formulation shown in Table 1 below.
As can be seen from Table 1, when the polyoxyalkylene / alkyl co-modified branched silicone was used together with the organically modified clay mineral plate-like particles, separation due to high temperature storage did not occur (Sample 1). Moreover, the dispersion stability of the powder was also excellent.
On the other hand, when another silicone-based nonionic surfactant was used in place of the polyoxyalkylene / alkyl co-modified branched chain silicone, separation occurred at high temperature storage (samples a to c). ). In some cases, the dispersion stability of the powder was inferior.
This suggests that polyoxyalkylene / alkyl co-modified branched silicone specifically improves emulsion stability at high temperatures.

(Manufacturing method)
1 part by weight of commercially available organically modified hectorite (Benton 38VCG, manufactured by Elementis Specialties (UK)) and 9 parts by weight of decamethylcyclopentasiloxane silicone were mixed, and the same volume of zirconia beads (diameter 1 mm) was added. And treated for 15 minutes to obtain a highly dispersed organically modified clay mineral 10%. An oil component was added thereto and mixed uniformly with a disper to obtain an oil phase. Furthermore, a W / O emulsion composition was obtained by emulsifying with a disper while gradually adding an aqueous phase to an oil phase in which powder was added and uniformly mixed and dispersed.

Test Example 2 Blending amount of polyoxyalkylene / alkyl co-modified branched chain silicone Further, as shown in Table 2 below, the blending amount of polyoxyalkylene / alkyl co-modified branched chain silicone was changed and the same test was performed.
As a result, if the blending amount of the polyoxyalkylene / alkyl co-modified branched silicone was too small, the effect of suppressing the separation at high temperature storage and the effect of stabilizing the dispersion of the powder were sometimes insufficient.
Therefore, the polyoxyalkylene / alkyl co-modified branched silicone is preferably blended in the W / O emulsion composition by 1.5% by mass or more, and more preferably by 2% by mass or more.

Test Example 3 Effect of Both-Terminal Siliconized Glycerin A W / O emulsion composition was similarly prepared with the composition shown in Table 3 below.
As can be seen from Table 3, the viscosity of the polyoxyalkylene / alkyl co-modified branched silicone alone may be significantly reduced when stored at room temperature for a long period of time. The viscosity reduction was suppressed. The effect of blending both terminal silicone glycerin was notable at 0.5 times mass or more, further 1 times mass or more, especially 1.5 times mass or more, relative to polyoxyalkylene / alkyl co-modified branched silicone. .

Claims (6)

(A) an organically modified clay mineral which is a plate-like particle having an average thickness of 0.1 μm or less and an average major axis of 0.5 to 50 μm;
(B) a polyoxyalkylene / alkyl co-modified branched silicone;
Containing
A W / O emulsion composition having a viscosity of 10,000 mPa · s or less.   The W / O emulsion composition according to claim 1, wherein (B) the polyoxyalkylene / alkyl co-modified branched silicone is 1.5% by mass or more in the W / O emulsion composition. Emulsified composition.   The W / O emulsion composition according to claim 1 or 2, further comprising (C) both-ends siliconeized glycerin.   4. The W / O emulsion composition according to claim 3, wherein (C) both-ends siliconeized glycerin is 0.5 times mass or more with respect to (B) polyoxyalkylene-alkyl co-modified branched silicone. W / O emulsified composition.   The W / O emulsion composition according to any one of claims 1 to 4, wherein the oil phase contains silicone oil.   The W / O emulsion composition according to any one of claims 1 to 5, further comprising a powder.