JP7785464B2 - W/O type emulsion composition - Google Patents

Description

The present invention relates to a W/O emulsion composition suitable for use in cosmetics and the like.

W/O emulsion compositions (water-in-oil emulsion compositions) have advantages such as a high occlusive effect and high moisturizing properties due to the presence of an oily component in the continuous phase. However, W/O emulsion compositions have problems with the feel they produce after application, such as stickiness and poor spreadability. Furthermore, the inclusion of silicone resins, film-forming agents, etc. can create a film-like feel on the skin after application, impairing the feel after application.

Patent Document 1 proposes an attempt to improve the feel of use by combining specific polymers that form hydrogels. However, there is a demand for W/O emulsion compositions that offer an even better feel of use.

Japanese Patent Application Laid-Open No. 2019-89747

The objective of the present invention is to provide a W/O emulsion composition that provides an excellent feel when used.

The present inventors conducted research to solve the above problems and discovered that a W/O emulsion composition with excellent usability can be obtained by combining a specific silicone oil and organically modified bentonite, thereby completing the present invention.
That is, the gist of the present invention relates to the following.

[1] A W/O type emulsion composition containing the following components (A), (B), and (C):
(A) one or two selected from lauryl PEG-9 polydimethylsiloxyethyl dimethicone and PEG-9 polydimethylsiloxyethyl dimethicone; (B) poly(oxyethylene-oxypropylene) methylpolysiloxane copolymer; and (C) organically modified bentonite. [2] The W/O emulsion composition according to [1], wherein component (A) is lauryl PEG-9 polydimethylsiloxyethyl dimethicone.
[3] The W/O type emulsion composition according to [1] or [2], wherein component (B) is one or more selected from PEG/PPG-18/18 dimethicone, PEG/PPG-19/19 dimethicone, cetyl PEG/PPG-10/1 dimethicone, and lauryl PEG/PPG-18/18 methicone.
[4] The W/O emulsion composition according to any one of [1] to [3], wherein the component (C) is Quaternium-90 bentonite.
[5] The W/O emulsion composition according to any one of [1] to [4], wherein the content of component (A) is 0.1% by mass to 10% by mass based on the total amount of the composition.
[6] The W/O emulsion composition according to any one of [1] to [5], wherein the content of component (B) is 0.1% by mass to 10% by mass based on the total amount of the composition.
[7] The W/O emulsion composition according to any one of [1] to [6], wherein the content of component (C) is 0.1% by mass to 3% by mass based on the total amount of the composition.
[8] The W/O emulsion composition according to any one of [1] to [7], wherein the mass ratio of component (A) to component (B) ((A)/(B)) is 0.1 to 10.
[9] The W/O type emulsion composition according to any one of [1] to [8], wherein the mass ratio of the total of component (A) and component (B) to component (C), ((A) + (B))/(C), is 0.1 to 40.
[10] The W/O emulsion composition according to any one of [1] to [9], which is a skin external preparation.

The present invention can provide a W/O emulsion composition that provides an excellent feel when used. In particular, it can provide a W/O emulsion composition that does not leave a sticky feeling on the skin during application, does not leave a filmy feeling on the skin after application, and is easy to spread during application.

The present invention will be described below.
<W/O type emulsion composition>
One aspect of the present invention is
The present invention relates to a W/O type emulsion composition (hereinafter, sometimes referred to as the "W/O type emulsion composition of the present invention") containing the following components (A), (B), and (C):
(A) One or two selected from lauryl PEG-9 polydimethylsiloxyethyl dimethicone and PEG-9 polydimethylsiloxyethyl dimethicone; (B) poly(oxyethylene-oxypropylene) methylpolysiloxane copolymer; (C) organically modified bentonite.

The present inventors have conducted various investigations in search of a technique for improving the feeling of use of a W/O emulsion composition.
In this context, the present inventors have succeeded in creating a W/O emulsion composition that provides an excellent feel when used by combining lauryl PEG-9 polydimethylsiloxyethyl dimethicone and PEG-9 polydimethylsiloxyethyl dimethicone, which are silicone branched polyether-modified silicones, with poly(oxyethylene-oxypropylene)methylpolysiloxane copolymer, in combination with organically modified bentonite. Based on this finding, the present invention was completed.

<Component (A) Lauryl PEG-9 Polydimethylsiloxyethyl Dimethicone and PEG-9 Polydimethylsiloxyethyl Dimethicone>
The W/O emulsion composition of the present invention contains, as component (A), one or two silicone-branched polyether-modified silicones selected from lauryl PEG-9 polydimethylsiloxyethyl dimethicone and PEG-9 polydimethylsiloxyethyl dimethicone, with lauryl PEG-9 polydimethylsiloxyethyl dimethicone being preferred as component (A).

Such silicone-branched polyether-modified silicones can be commercially available and are not limited to these. Examples include, but are not limited to, lauryl PEG-9 polydimethylsiloxyethyl dimethicone such as "KF-6038" (manufactured by Shin-Etsu Chemical Co., Ltd.), and PEG-9 polydimethylsiloxyethyl dimethicone such as "KF-6028" (manufactured by Shin-Etsu Chemical Co., Ltd.) and "KF-6028P" (manufactured by Shin-Etsu Chemical Co., Ltd.).

In the W/O emulsion composition of the present invention, the content of component (A) is preferably 0.1% by mass or more and 10% by mass or less, more preferably 0.2% by mass or more and 6% by mass or less, even more preferably 0.5% by mass or more and 5% by mass or less, and particularly preferably 1% by mass or more and 4% by mass or less, based on the entire composition, from the viewpoint of the feel when using the composition. When two types of component (A) are used in combination, the above content is the total amount of the two types. The blending ratio of the two types can be appropriately adjusted depending on the feel when using the composition, etc.

<Component (B) Poly(oxyethylene-oxypropylene)methylpolysiloxane copolymer>
The W/O emulsion composition of the present invention contains a poly(oxyethylene-oxypropylene)methylpolysiloxane copolymer as component (B). The poly(oxyethylene-oxypropylene)methylpolysiloxane copolymer may be either linear or branched, with linear poly(oxyethylene-oxypropylene)methylpolysiloxane copolymers being preferred. The linear poly(oxyethylene-oxypropylene)methylpolysiloxane copolymer may also be a modified product that has been further modified with alkyl or alkoxy groups.

As such a linear poly(oxyethylene-oxypropylene)methylpolysiloxane copolymer, commercially available products can be used, and are not limited thereto. For example, PEG/PPG-15/15 dimethicone ("5330") may be used. Fluid"; manufactured by DuPont Toray Specialty Materials Co., Ltd.), PEG/PPG-18/18 dimethicone ("5200"; manufactured by DuPont Toray Specialty Materials Co., Ltd.), PEG/PPG-19/19 dimethicone ("BY11-030"; manufactured by DuPont Toray Specialty Materials Co., Ltd.), PEG/PPG-20/20 dimethicone ("SH3749"; manufactured by Dow Corning Toray Silicone Co., Ltd.), PEG/PPG-30/10 dimethicone ("BY25-339"; manufactured by DuPont Toray Specialty Materials Co., Ltd.), PEG/PPG-20/22 butyl ether dimethicone ("KF-6012"; manufactured by Shin-Etsu Chemical Co., Ltd.), lauryl PEG/PPG-18/18 methicone ("5200 Formulation Aid" manufactured by DuPont Toray Specialty Materials Co., Ltd.), cetyl PEG/PPG-10/1 dimethicone ("Abil EM-90" manufactured by Goldschmidt Chemical Co., Ltd.), and the like.
As component (B), PEG/PPG-18/18 dimethicone, PEG/PPG-19/19 dimethicone, cetyl PEG/PPG-10/1 dimethicone, and lauryl PEG/PPG-18/18 methicone are preferred, PEG/PPG-19/19 dimethicone and lauryl PEG/PPG-18/18 methicone are more preferred, and PEG/PPG-19/19 dimethicone is even more preferred.
The poly(oxyethylene-oxypropylene)methylpolysiloxane copolymers may be used in the present invention either individually or in combination of two or more.

In the W/O emulsion composition of the present invention, the content of component (B) is preferably 0.1% by mass to 10% by mass, more preferably 0.2% by mass to 6% by mass, even more preferably 0.5% by mass to 5% by mass, and particularly preferably 1% by mass to 4% by mass, based on the total composition, from the viewpoint of the feel when using the composition. When two or more types of component (B) are used in combination, the above content is the total amount of the two or more types. The blending ratio of the two or more types can be adjusted as appropriate depending on the feel when using the composition, etc.

In addition, the mass ratio of component (A) to component (B) in the present invention, expressed as the mass ratio (A)/(B) of component (A) to component (B), is preferably 0.1 to 10, more preferably 0.1 to 8, more preferably 0.2 to 5, and even more preferably 0.5 to 2.5, from the viewpoint of the feel of the composition when used.

<Component (C) Organically Modified Bentonite>
The W/O emulsion composition of the present invention contains organically modified bentonite as component (C).
Examples of organically modified bentonite include dimethylbenzyldodecylammonium montmorillonite clay (lipophilized bentonite), dimethyldioctadecylammonium montmorillonite clay (lipophilized bentonite), stearalkonium bentonite (obtained by reacting bentonite with stearalkonium chloride), quaternium-18 bentonite (reaction product of bentonite with quaternium-18), quaternium-90 bentonite (reaction product of bentonite with quaternium-90), etc. As component (C), quaternium-18 bentonite and quaternium-90 bentonite are preferred, and quaternium-90 bentonite is more preferred.

Such organically modified bentonite can be commercially available, and although not limited thereto, examples that can be used include Quaternium-18 bentonite ("Esben W"; manufactured by Nippon Organic Clay Co., Ltd.) and Quaternium-90 bentonite ("Esben WV"; manufactured by Nippon Organic Clay Co., Ltd.).
The organically modified bentonite may be used in the present invention either alone or in combination of two or more.

In the present invention, the content of the organically modified bentonite (component (C)) is preferably 0.1% by mass or more and 3% by mass or less, more preferably 0.2% by mass or more and 2% by mass or less, and even more preferably 0.4% by mass or more and 1.5% by mass or less, based on the total composition, from the viewpoint of the feel of use of the composition. When two or more types of component (C) are used in combination, the above content is the total amount of the two or more types. The blending ratio of the two or more types can be adjusted appropriately depending on the feel of use, etc.

In addition, in the present invention, the mass ratio ((A) + (B))/(C) of the total of components (A) and (B) to component (C) is preferably 0.1 or more and 40 or less, more preferably 0.5 or more and 20 or less, more preferably 1 or more and 10 or less, and even more preferably 2 or more and 5 or less, from the viewpoint of the feel when using the composition.

<Other ingredients>
The W/O emulsion composition of the present invention may contain other optional components as long as the effects of the composition are not impaired.
The optional components are not particularly limited and can be any components that can be normally blended in cosmetics, etc. The optional components can be used in the present invention either alone or in combination of two or more.

Such ingredients include, for example, oils and waxes such as macadamia nut oil, avocado oil, corn oil, olive oil, rapeseed oil, sesame oil, castor oil, safflower oil, cottonseed oil, jojoba oil, coconut oil, palm oil, liquid lanolin, hydrogenated coconut oil, hydrogenated oil, Japan wax, hydrogenated castor oil, beeswax, candelilla wax, carnauba wax, Ibota wax, lanolin, reduced lanolin, hard lanolin, and jojoba wax; liquid paraffin, squalane, pristane, ozokerite, paraffin, ceresin, hydrocarbons such as petrolatum and microcrystalline wax; higher fatty acids such as oleic acid, isostearic acid, lauric acid, myristic acid, palmitic acid, stearic acid, behenic acid, and undecylenic acid; higher alcohols such as cetyl alcohol, stearyl alcohol, isostearyl alcohol, behenyl alcohol, octyldodecanol, myristyl alcohol, and cetostearyl alcohol; isononyl isononanoate, cetyl isooctanoate, and isopropyl myristate; Hexyldecyl isostearate, diisopropyl adipate, di-2-ethylhexyl sebacate, cetyl lactate, diisostearyl malate, ethylene glycol di-2-ethylhexanoate, neopentyl glycol dicaprate, glycerin di-2-heptylundecanoate, glycerin tri-2-ethylhexanoate, trimethylolpropane tri-2-ethylhexanoate, trimethylolpropane triisostearate, pentane erythritol tetra-2-ethylhexanoate synthetic ester oils such as methyl ester oils; chain polysiloxanes such as dimethylpolysiloxane, methylphenylpolysiloxane, and diphenylpolysiloxane; cyclic polysiloxanes such as octamethylcyclotetrasiloxane, decamethylcyclopentasiloxane, and dodecamethylcyclohexanesiloxane; oils such as silicone oils including amino-modified polysiloxanes, polyether-modified polysiloxanes other than essential components, alkyl-modified polysiloxanes, and modified polysiloxanes such as fluorine-modified polysiloxanes;

Anionic surfactants such as fatty acid soaps (sodium laurate, sodium palmitate, etc.), potassium lauryl sulfate, and alkyl sulfate triethanolamine ether; cationic surfactants such as stearyltrimethylammonium chloride, benzalkonium chloride, and laurylamine oxide; imidazoline-based amphoteric surfactants (2-cocoyl-2-imidazolinium hydroxide-1-carboxyethyloxy disodium salt, etc.), betaine-based surfactants (alkyl betaine, amido betaine, sulfobetaine, etc.), and acyl amphoteric surfactants such as methyl methyl taurine; sorbitan fatty acid esters (sorbitan monostearate, sorbitan sesquioleate, etc.), glycerin fatty acids (glycerin monostearate, etc.), propylene glycol fatty acid esters (propylene glycol monostearate, etc.), hydrogenated castor oil derivatives, glycerin alkyl ether, POE sorbitan fatty acid esters (POE sorbitan monooleate, polyoxyethylene sorbitan monostearate, etc.), POE sorbitan fatty acid esters (POE-sorbitan monolaurate, etc.), POE glycerin fatty acid esters (POE-glycerin monoisostearate, etc.), POE fatty acid esters (polyethylene glycol monooleate, POE distearate, etc.), POE alkyl ethers (POE 2-octyldodecyl ether, etc.), POE alkyl phenyl ethers (POE nonylphenyl ether, etc.), Pluronic (registered trademark) types, POE/POP alkyl ethers (POE/POP 2-decyltetradecyl ether, etc.), Tetronics, POE castor oil/hard Nonionic surfactants such as hydrogenated castor oil derivatives (POE castor oil, POE hydrogenated castor oil, etc.), sucrose fatty acid esters, and alkyl glucosides; polyhydric alcohols such as polyethylene glycol, glycerin, 1,3-butylene glycol (1,3-BG), erythritol, sorbitol, xylitol, maltitol, propylene glycol, dipropylene glycol, diglycerin, isoprene glycol, 1,2-pentanediol, 2,4-hexanediol, 1,2-hexanediol, and 1,2-octanediol;

Powders such as mica, talc, kaolin, synthetic mica, calcium carbonate, magnesium carbonate, anhydrous silicic acid (silica), aluminum oxide, and barium sulfate, which may be surface-treated; inorganic pigments such as red iron oxide, red iron oxide, yellow iron oxide, black iron oxide, cobalt oxide, ultramarine, iron blue, titanium oxide, and zinc oxide, which may be surface-treated; pearling agents such as titanium dioxide, fish phosphate foil, and bismuth oxychloride, which may be surface-treated; laked pigments Organic pigments such as Red No. 202, Red No. 228, Red No. 226, Yellow No. 4, Blue No. 404, Yellow No. 5, Red No. 505, Red No. 230, Red No. 223, Orange No. 201, Red No. 213, Yellow No. 204, Yellow No. 203, Blue No. 1, Green No. 201, Purple No. 201, and Red No. 204 may be used; organic powders such as polyethylene powder, polymethyl methacrylate, methyl methacrylate crosspolymer, nylon powder, and organopolysiloxane elastomer;

para-aminobenzoic acid-based ultraviolet absorbers; anthranilic acid-based ultraviolet absorbers; salicylic acid-based ultraviolet absorbers; cinnamic acid-based ultraviolet absorbers; benzophenone-based ultraviolet absorbers; sugar-based ultraviolet absorbers; ultraviolet absorbers such as 2-(2'-hydroxy-5'-t-octylphenyl)benzotriazole and 4-methoxy-4'-t-butyldibenzoylmethane;

Examples of the active ingredient include lower alcohols such as ethanol and isopropanol; B vitamins such as vitamin A or a derivative thereof, vitamin _B6 hydrochloride, vitamin _B6 tripalmitate, vitamin _B6 dioctanoate, vitamin _B2 or a derivative thereof, vitamin _B12 , and vitamin _B15 or a derivative thereof; vitamin E vitamins such as α-tocopherol, β-tocopherol, γ-tocopherol, and vitamin E acetate, vitamin D vitamins, vitamin H, pantothenic acid, pantethine, and pyrroloquinoline quinone; activators such as royal jelly, photosensitizers, and cholesterol derivatives; blood circulation promoters such as nonylic acid valenylamide, capsaicin, zingerone, and tannic acid; antiseborrheic agents such as sulfur and thianthol; water-soluble polymers such as collagen, hyaluronic acid, and salts thereof; solvents such as water; film-forming agents such as trimethylsiloxysilicate; and fragrances.

In addition, the W/O emulsion composition of the present invention can also optionally contain various active ingredients, moisturizers, pH adjusters, preservatives, antibacterial agents, antioxidants, antioxidant aids, etc.

Active ingredients include whitening ingredients, wrinkle-reducing ingredients, anti-inflammatory ingredients, and extracts derived from plants and animals.

The whitening ingredient is not particularly limited as long as it is one that is commonly used in cosmetics, and examples thereof include 4-n-butylresorcinol, ascorbic acid glucoside, 3-O-ethyl ascorbic acid, tranexamic acid, arbutin, ellagic acid, kojic acid, linoleic acid, nicotinamide, 5,5'-dipropylbiphenyl-2,2'-diol, 5'-adenylate disodium, cetyl tranexamate, 4-methoxysalicylic acid potassium salt, hydroquinone, and pantothenic acid.

There are no particular limitations on wrinkle-improving ingredients, as long as they are commonly used in cosmetics. Examples include sodium trifluoroisopropyloxopropylaminocarbonylpyrrolidinecarbonylmethylpropylaminocarbonylbenzoylaminoacetate, nicotinamide, vitamin A or its derivatives (retinol, retinal, retinoic acid, tretinoin, isotretinoin, tocopherol retinoate, retinol palmitate, retinol acetate, etc.), ursolic acid benzyl ester, ursolic acid phosphate ester, betulinic acid benzyl ester, and benzilic acid phosphate ester.

Anti-inflammatory ingredients include kurarinone, glabridin, glycyrrhizinic acid, glycyrrhetinic acid, pantothenyl alcohol, etc., with glycyrrhizinic acid and its salts, alkyl glycyrrhetinate and its salts, and glycyrrhetinic acid and its salts being preferred.

The extracts derived from animals and plants are not particularly limited as long as they are generally used in pharmaceuticals, cosmetics, foods, etc. Examples include Akebia extract, Asunaro extract, Asparagus extract, Avocado extract, Hydrangea tea extract, Almond extract, Arnica extract, Aloe extract, Aronia extract, Apricot extract, Ginkgo extract, Kinoko extract, Fennel extract, Aralia extract, Aralia udo extract, Angelica extract, Eleuthero extract, Enmeiso extract, Scutellaria root extract, Phellodendron bark extract, Coptis japonica extract, Panax ginseng extract, Hypericum perforatum extract, Nettle extract, Orange extract, Oleander extract, Pueraria lobata extract, Chamomilla recutita (Matricaria) extract, Carrot extract, Artemisia capillaris extract, Licorice extract, Kiwi extract, Cucumber extract, Guava extract, Sophora root extract, Gardenia extract, Sasa veitchii extract, Sophora floribunda extract, Walnut extract, Gujarati extract, Rapefruit extract, black rice extract, chlorella extract, mulberry extract, cinnamon root extract, Alpinia zerumbet extract, gentian extract, Geranium extract, black tea extract, burdock extract, rice extract, fermented rice extract, fermented rice bran extract, rice germ oil, cowberry extract, salvia extract, soapwort extract, bamboo extract, hawthorn extract, Japanese sansho extract, Japanese pepper extract, shiitake mushroom extract, rehmannia root extract, lithospermum root extract, perilla extract, linden extract, meadowsweet extract, peony extract, ginger extract, calamus root extract, birch extract, horsetail extract, stevia extract, fermented stevia, ivy extract, hawthorn extract, elderberry extract, yarrow Extract, Peppermint Extract, Sage Extract, Mallow Extract, Cnidium Extract, Swertia Extract, Sophora Bark Extract, Rhubarb Extract, Soybean Extract, Chinese Herb Extract, Thyme Extract, Dandelion Extract, Tea Extract, Clove Extract, Citrus Peel Extract, Sweet Tea Extract, Chili Pepper Extract, Angelica Root Extract, Calendula Extract, Peach Blossom Extract, Spruce Extract, Houttuynia Cordata Extract, Tomato Extract, Natto Extract, Carrot Extract, Garlic Extract, Wild Rose Extract, Hibiscus Extract, Bakumondo Extract, Lotus Extract, Parsley Extract, Birch Extract, Hamamelis Extract, Japanese Chrysanthemum Extract, Japanese Cypress Extract, Loquat Extract, Dandelion Extract, Butterbur Shoot Extract, Poria Coccinellifera Extract, Butcher's Broom Extract Preferred examples of the extract include grape extract, grape seed extract, loofah extract, safflower extract, peppermint extract, linden extract, peony extract, hop extract, pine extract, mayonnaise extract, horse chestnut extract, skunk cabbage extract, soapberry extract, melissa extract, mozuku extract, peach extract, cornflower extract, eucalyptus extract, saxifrage extract, yuzu extract, lily extract, coix seed extract, mugwort extract, lavender extract, green tea extract, apple extract, rooibos tea extract, lychee extract, lettuce extract, lemon extract, forsythia extract, astragalus extract, rose extract, rosemary extract, Roman chamomile extract, royal jelly extract, and burnet extract.

Humectants include polyethylene glycol, propylene glycol, glycerin, 1,3-butylene glycol, xylitol, sorbitol, maltitol, chondroitin sulfate, hyaluronic acid, mucoitin sulfate, caronic acid, atelocollagen, cholesteryl-12-hydroxystearate, sodium lactate, bile salts, dl-pyrrolidone carboxylate, short-chain soluble collagen, diglycerin (EO)PO adduct, Rosa robur extract, yarrow extract, melilot extract, etc.

Examples of pH adjusters include buffers such as lactic acid-sodium lactate, citric acid-sodium citrate, and succinic acid-sodium succinate.

Preservatives include methylparaben, ethylparaben, butylparaben, phenoxyethanol, etc.

Preferred examples of antibacterial agents include synthetic antibacterial agents such as 1,3-butylene glycol and parahydroxybenzoic acid esters, as well as natural antibacterial substances such as caprylyl glycol, glyceryl caprylate, ethylhexylglycerin, and caprylhydroxamic acid.

Examples of antioxidants include tocopherols, dibutylhydroxytoluene, butylhydroxyanisole, and gallic acid esters. Examples of antioxidant aids include phosphoric acid, citric acid, ascorbic acid, maleic acid, malonic acid, succinic acid, fumaric acid, cephalin, hexametaphosphate, phytic acid, and ethylenediaminetetraacetic acid.

These optional ingredients can be added at any step in the present invention, or before or after the step.

The W/O emulsion composition of the present invention can be produced using conventional emulsification methods, except for the presence of the above-mentioned essential components. For example, the oil phase components are heated and dissolved, the powder components are added and dispersed, and the heated and dissolved aqueous phase components are added to the oil phase, followed by emulsification with stirring to obtain a W/O emulsion composition.

<External skin preparations>
The W/O type emulsion composition of the present invention can be used, for example, as a topical skin preparation, a medicine, a cosmetic preparation including a quasi-drug, etc. Cosmetics are particularly preferred. The dosage form is not particularly limited as long as it is a W/O type emulsion dosage form, and examples thereof include a liquid, emulsion, paste, cream, gel, etc., with a liquid, emulsion, etc. being preferred.

The type of cosmetic of the present invention is not particularly limited, and can be widely used in known cosmetic compositions that use a W/O emulsion. Specific examples of such cosmetic compositions include makeup cosmetics such as makeup base, foundation, eye shadow, eye liner, and lipstick, and sunscreen cosmetics such as sunscreen lotions and sunscreen creams.

In addition to using the W/O emulsion composition of the present invention, cosmetics, including topical skin preparations, pharmaceuticals, and quasi-drugs, can be produced using conventionally known production methods.

The present invention will be explained in detail below using examples, but these are merely illustrative of the present invention and the scope of the present invention is not limited to these examples.

W/O emulsion compositions for the Examples and Comparative Examples were prepared and evaluated using the formulations shown in Table 1. Specifically, the procedure was as follows: The oil phase components were heated to 70°C and dissolved, and the powder components were added and dispersed. The aqueous phase components, which had also been heated and dissolved at 70°C, were added to the oil phase, and the mixture was emulsified while stirring with a homomixer to obtain the desired W/O emulsion compositions.

For the W/O emulsion compositions of the Examples and Comparative Examples, a usability test was conducted by having expert evaluators use each prepared sample. The results are shown in Table 1.

The criteria for judgment are as follows:
1) Non-stickiness Ten expert evaluators evaluated the stickiness of the W/O type cosmetic preparations when touching the skin during application on the following five-point scale. The evaluation results in the table are the total scores of the ten expert evaluators.
5: No stickiness on the skin during application.
4: There is almost no stickiness on the skin during application.
3: The skin feels a little sticky during application.
2: The skin feels sticky during application.
1: The skin feels quite sticky during application.

2) Lack of coating feeling on skin after application Ten expert evaluators applied 0.16 g of each W/O emulsion cosmetic to the face using a sponge, and visually evaluated the coating feeling immediately after application using the following five-point scale. The results are shown as the total score of the 10 evaluators.
5: No filmy feeling at all.
4: No coating sensation.
3: Not much of a coating feeling.
2: There is a filmy feeling.
1: There is a strong filmy feeling.

3) Ease of Spreading Ten expert evaluators applied the W/O type cosmetic preparations to the skin and evaluated the spreadability during application on the following five-point scale. The evaluation results in the table are shown as the total scores of the 10 expert evaluators.
5: Spreads very well on the skin.
4: Spreads easily on the skin.
3: Spreads fairly well on the skin.
2: Spreads poorly on the skin.
1: Does not spread well on the skin.

It was found that the W/O type emulsion compositions of the examples containing component (A), component (B), and component (C) had an excellent feel when used, in terms of non-stickiness on the skin during application, non-filmy feeling on the skin after application, and ease of spreadability during application.
On the other hand, the following comparative examples provided an unsatisfactory feel when used: Comparative Example 1, which did not contain component (A); Comparative Example 2, which did not contain component (B); Comparative Example 3, which did not contain component (C); Comparative Example 4, which contained a silicone-branched polyglycerin-modified silicone instead of component (A); Comparative Example 5, which contained a polyoxyethylenemethylpolysiloxane copolymer instead of component (B); and Comparative Example 6, which contained silylated silica instead of component (C).
It was also found that lauryl PEG-9 polydimethylsiloxyethyl dimethicone is more preferable as component (A), PEG/PPG-19/19 dimethicone is more preferable as component (B), Quaternium-90 bentonite is more preferable as component (C), the mass ratio of components (A)/(B) is more preferably 0.5 to 2.5, and the mass ratio of components ((A)+(B))/(C) is more preferably 2 to 5.

The present invention can be applied to topical skin preparations, medicines, cosmetics including quasi-drugs, etc.

Claims (8)

The following components (A), (B) and (C) :
(A) One or two selected from lauryl PEG-9 polydimethylsiloxyethyl dimethicone and PEG-9 polydimethylsiloxyethyl dimethicone; (B) One or two selected from PEG/PPG-19/19 dimethicone and lauryl PEG/PPG-18/18 methicone.
(C) Organically modified bentonite
A W/O type emulsion composition comprising:
The W/O emulsion composition, wherein the mass ratio of component (A) to component (B) ((A)/(B)) is 1.25 to 10. The W/O emulsion composition according to claim 1, wherein component (A) is lauryl PEG-9 polydimethylsiloxyethyl dimethicone. 3. The W/O type emulsion composition according to claim 1 , wherein the component (C) is Quaternium-90 bentonite. 4. The W/O emulsion composition according to claim 1 , wherein the content of component (A) is 0.1% by mass to 10% by mass based on the total amount of the composition. 5. The W/O emulsion composition according to claim 1 , wherein the content of component (B) is 0.1% by mass to 10% by mass based on the total amount of the composition. 6. The W/O emulsion composition according to claim 1 , wherein the content of component (C) is 0.1% by mass to 3% by mass based on the total amount of the composition. 7. The W/O type emulsion composition according to claim 1 , wherein the mass ratio of the total of the components (A) and (B) to the component (C), ((A) + (B))/(C), is 0.1 to 40. The W/O type emulsion composition according to any one of claims 1 to 7 , which is an external preparation for skin.