Water-in-oil emulsion cosmetic

Abstract

To provide a water-in-oil emulsion cosmetic that has reduced stickiness while having smooth usability, and also has a good feeling of fitting during application.SOLUTION: A water-in-oil emulsion cosmetic has (A) a water-soluble thickener in its internal phase and has a least one of (B) an emulsifiable-crosslinked elastomer and (C) metallic soap in its outer phase.SELECTED DRAWING: None

Description

[Technical Field]

[0001] The present invention relates to a water-in-oil emulsion cosmetic preparation, more specifically to a water-in-oil emulsion cosmetic preparation that is not sticky, has an excellent feeling of fitting during application, and is also smooth to use. [Background technology]

[0002] Water-in-oil emulsion cosmetics have superior water resistance compared to oil-in-water emulsions, and are characterized by the ability to efficiently incorporate emollient oils, oil-soluble drugs, UV absorbers, and the like, making them effective skin care cosmetics. However, because water-in-oil emulsion cosmetics have poor stability, it is common to add oil-soluble thickeners such as organically modified clay minerals and dextrin fatty acid esters to thicken the oil that makes up the external phase (oil phase) and encase the internal phase (aqueous phase) in the thickened oil, thereby improving dispersion stability. However, the addition of oil-soluble thickeners has the problem of reducing the refreshing feeling and causing stickiness and oiliness.

[0003] On the other hand, it has also been proposed to improve the stability of emulsion particles by blending a water-soluble thickener into the internal phase (aqueous phase) of a water-in-oil emulsion cosmetic. For example, Patent Document 1 discloses a water-in-oil emulsion cosmetic that contains a specific diester, a nonionic surfactant, an oil-soluble and / or water-soluble thickener, powder, and a predetermined amount of water, and aims to improve stability by using a single oil-soluble and / or water-soluble thickener or a combination of multiple oil-soluble and / or water-soluble thickeners. Patent Document 2 discloses a water-in-oil emulsion cosmetic containing a silicone surfactant, an oil, an oil gelling agent, a water-soluble polymer thickener, and water, and claims that the incorporation of the water-soluble polymer thickener gives the aqueous phase appropriate viscoelasticity, thereby providing a refreshing, non-sticky feel. Patent Document 3 discloses a water-in-oil emulsion composition characterized by containing at least one type of microparticles selected from the group consisting of cellulose microparticles and cellulose composite microparticles, which are physically finely processed cellulose and have an average particle size of 10 to 500 nm, and it is said that dispersing the microparticles in the aqueous phase improves stability over time and spreadability.

[0004] However, when a water-soluble thickener is blended into a water-in-oil emulsion cosmetic, although the lack of stickiness is improved, it is still not sufficient, and it is difficult to obtain satisfactory results in terms of smoothness, fit, etc. compared to when an oil-soluble thickener is blended, and further improvements are required. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Patent Application Laid-Open No. 2010-150184 [Patent Document 2] Japanese Patent Application Laid-Open No. 2008-127306 [Patent Document 3] Japanese Patent Application Laid-Open No. 2006-342140 DISCLOSURE OF THE INVENTION [Problem to be solved by the invention]

[0006] The present invention has been made in view of the above-mentioned circumstances, and has an object to provide a water-in-oil emulsion cosmetic that has smooth usability while suppressing stickiness, and also has an excellent feeling of fitting during application. [Means for solving the problem]

[0007] As a result of intensive research conducted by the present inventors to solve the above-mentioned problems, they discovered that the above-mentioned problems can be solved by blending a water-soluble thickener in the internal phase (aqueous phase) of a water-in-oil emulsion cosmetic and blending at least one of an emulsifying crosslinked elastomer and a metal soap in the external phase (oil phase), thereby completing the present invention. As described above, when a water-in-oil emulsion cosmetic is blended with a water-soluble thickener alone, the lack of stickiness is improved but not sufficiently, and it is difficult to obtain satisfactory results in terms of smoothness, fit, etc. The present inventors have discovered that by blending at least one of an emulsifiable crosslinked elastomer and a metal soap in addition to a water-soluble thickener, it is possible to improve smoothness while suppressing stickiness, and to obtain a water-in-oil emulsion cosmetic that also provides an excellent fit during application. That is, the present invention provides a water-in-oil emulsion cosmetic preparation containing (A) a water-soluble thickener in the internal phase and at least one of (B) an emulsifying crosslinked elastomer and (C) a metal soap in the external phase. [Effects of the Invention]

[0008] By adopting the above-described configuration, the present invention can simultaneously improve the non-stickiness, smooth usability, and fit during application that have been problems with water-in-oil emulsion cosmetics. In addition, it can also improve the feel of use, such as freshness and good spreadability during application. In the present invention, the term "fit" refers to the feeling that the cosmetic stays well on the skin when applied, without continuing to spread and leaving a long-lasting finish. DETAILED DESCRIPTION OF THE INVENTION

[0009] The present invention provides a water-in-oil emulsion cosmetic composition comprising an internal phase containing a water-soluble thickener (A) and an external phase containing at least one of an emulsifying crosslinked elastomer (B) and a metal soap (C). Each component will be described in detail below.

[0010] <(A) Water-soluble thickener> The water-soluble thickener is a water-soluble thickener that can be generally used in cosmetics. Examples of water-soluble thickeners include plant-based polymers such as gum arabic, tragacanth, galactan, carob gum, guar gum, karaya gum, carrageenan, xanthan gum, pectin, agar, quince seed, and algae colloid (brown algae extract); microbial polymers such as gellan gum, dextran, succinoglucan, and pullulan; animal polymers such as collagen, casein, albumin, and gelatin; and starch-based polymers such as starch (rice, corn, potato, and wheat), carboxymethyl starch, and methylhydroxypropyl starch. Other examples include cellulose-based polymers such as methyl cellulose, nitrocellulose, ethyl cellulose, methylhydroxypropyl cellulose, hydroxyethyl cellulose, sodium cellulose sulfate, hydroxypropyl cellulose, sodium carboxymethyl cellulose, crystalline cellulose, and cellulose powder; and alginic acid-based polymers such as sodium alginate and propylene glycol alginate. Further examples include vinyl polymers such as polyvinyl methyl ether and carboxyvinyl polymers, polyoxyethylene polymers, polyoxyethylene polyoxypropylene copolymer polymers, acrylic polymers such as polyethyl acrylate and polyacrylamide, polyethyleneimine, cationic polymers, bentonite, magnesium aluminum silicate, laponite, hectorite, inorganic water-soluble polymers such as silicic anhydride, PEG-240 / decyltetradeceth-20 / hexamethylene diisocyanate copolymer, (dimethylacrylamide / sodium acryloyldimethyltaurate) crosspolymer, (sodium acrylate / acryloyldimethyltaurate) copolymer, (alkyl acrylate / steareth-20 methacrylate) copolymer, (ammonium acryloyldimethyltaurate / VP) copolymer, and the like.

[0011] Among these, it is preferable to use a polysaccharide thickener as the water-soluble thickener because of its excellent smoothness, and it is particularly preferable to use a combination of two or more polysaccharide thickeners. Examples of polysaccharide thickeners include cellulose thickeners such as crystalline cellulose, methyl cellulose, ethyl cellulose, hydroxyethyl cellulose, hydroxypropyl cellulose, and carboxymethyl cellulose; and natural polymeric polysaccharide thickeners such as gellan gum, carrageenan, guar gum, locust bean gum, gum arabic, xanthan gum, dextran, and succinoglucan.

[0012] A particularly preferred polysaccharide thickener is crystalline cellulose, which is obtained by defibrating cellulose fibers to the nano-level, and is called cellulose nanofiber. The cellulose nanofiber preferably has a fiber width of 10 nm or less, more preferably 5 nm or less. Cellulose nanofibers can be obtained by mechanical defibration treatment. Preferably, before the defibration treatment, cellulose is oxidized using TEMPO (2,2,6,6-tetramethylpiperidine-1-oxy radical) as a catalyst to introduce carboxyl groups (sodium carboxylate) onto the surface of the cellulose microfibrils. This preliminary treatment allows the cellulose to be defibrated into microfibril units by a milder mechanical defibration treatment, taking advantage of the repulsive force of the electric double layer. The cellulose nanofibers can be commercially available as aqueous dispersions in which water or a water-miscible organic solvent is used as the dispersion medium. Examples of such commercially available products include "Leocrysta C-2SP (Dai-ichi Kogyo Seiyaku Co., Ltd.)."

[0013] The water-soluble thickener disperses in the internal phase of the water-in-oil emulsion cosmetic, thickening the internal phase. The amount of water-soluble thickener blended is 0.01 to 15% by mass, preferably 0.1 to 5% by mass, and more preferably 0.5 to 2% by mass, relative to the total amount of the water-in-oil emulsion cosmetic. If the amount of water-soluble thickener blended is too small, the improvement in smoothness, etc. may not be fully realized, and conversely, if the amount blended is too large, it becomes difficult to disperse the water phase.

[0014] <(B) Emulsifying crosslinked elastomer and (C) metal soap> The emulsifying crosslinked elastomer and the metal soap emulsify, thicken, or gel the oil phase, thereby improving the stability of the water-in-oil emulsion cosmetic. Either the emulsifying crosslinked elastomer or the metal soap may be blended alone, or both may be blended in combination.

[0015] (B) Emulsifying crosslinked elastomer The emulsifying crosslinked elastomer is an elastomer having a hydrophilic chain and a crosslinked structure. The emulsifying crosslinked elastomer can be selected from, for example, silicone crosslinked products crosslinked with polyether chains or polyglycerin chains, and optionally having branched alkyl or silicone chains.

[0016] Examples of emulsifiable crosslinked elastomers include: - Dimethicone / (PEG-10 / 15) crosspolymer, a silicone crosslinked product crosslinked with polyether chains; - PEG-15 / lauryl dimethicone crosspolymer, a polyether-modified silicone crosslinker with an alkyl chain structure. - PEG-15 / lauryl polydimethylsiloxyethyl dimethicone crosspolymer, a crosslinked polyether-modified silicone with two types of branched chains: silicone and alkyl chains. Dimethicone / Polyglycerin-3 Crosspolymer, a silicone crosslinked product crosslinked with polyglycerin chains; - (Lauryl dimethicone / polyglycerin-3) crosspolymer, a polyglycerin-modified silicone crosslinked product with an alkyl chain structure. Examples include polyglyceryl-3 / laurylpolydimethylsiloxyethyldimethicone crosspolymer, a crosslinked polyglycerin-modified silicone compound with two types of branched chains: silicone chains and alkyl chains. Commercially available emulsifiable crosslinked elastomers include, for example, KSG-210, KSG-310, KSG-360Z, and KSG-710 (all manufactured by Shin-Etsu Chemical Co., Ltd.).

[0017] (C) Metal soap The metal soap is a metal salt of a saturated or unsaturated higher fatty acid, and is not particularly limited, but is preferably a salt of aluminum, calcium, magnesium, zinc, or the like of a saturated and / or unsaturated fatty acid having 8 to 24 carbon atoms, particularly 12 to 18 carbon atoms. Examples of metal soaps include aluminum distearate, aluminum myristate, magnesium myristate, zinc stearate, zinc myristate, and zinc oleate.

[0018] When an emulsifying crosslinked elastomer is blended into the water-in-oil emulsion cosmetic of the present invention, the amount is 0.01 to 30% by mass, and preferably 1 to 10% by mass, of the total amount of the water-in-oil emulsion cosmetic. If the blending amount of the emulsifying crosslinked elastomer is too small, stability may be impaired, and conversely, if the blending amount is too large, stickiness tends to become significant. On the other hand, when a metal soap is blended, the amount is 0.01 to 10% by mass, preferably 1 to 5% by mass, of the total amount of the water-in-oil emulsion cosmetic. If the blended amount of metal soap is too small, stability may be impaired, while if the blended amount is too large, the cosmetic tends to spread poorly during use and become noticeably sticky. When the emulsifiable crosslinked elastomer and the metal soap are blended in combination, the blending amounts may be adjusted appropriately depending on the blending amount of the other component.

[0019] <Optional ingredients> In addition to the above components (A) to (C), the water-in-oil emulsion cosmetic of the present invention can contain other components commonly used in cosmetics, provided that the effects of the present invention are not impaired. For example, various solvents, surfactants, powder components, drugs, UV absorbers, antioxidants, sequestering agents, pH adjusters, fragrances, preservatives, etc. can be appropriately blended as needed.

[0020] In particular, the water-in-oil emulsion cosmetic according to the present invention has excellent stability while suppressing stickiness, and therefore is capable of stably dispersing powder components. There are no particular limitations on the powder components that can be blended, and examples include organic resin powders such as polyamide resin powder (e.g., nylon powder), polyethylene powder, polymethyl methacrylate powder, polystyrene powder, styrene-acrylic acid copolymer resin powder, and cellulose powder; silicone resin powders such as polymethylsilsesquioxane powder; silicone rubber powders such as polydimethylsiloxane crosslinked elastomers; hydrophobized silica powders such as dimethylsilylated silicic anhydride and trimethylsilylated silicic anhydride; dimethylsiloxane-treated powders such as dimethylpolysiloxane-treated titanium dioxide, dimethylpolysiloxane-treated mica, dimethylpolysiloxane-treated talc, and dimethylpolysiloxane-treated iron oxide; and hydrophobized surface-treated powders such as dextrin palmitate-treated talc, dextrin palmitate-treated mica, dextrin palmitate-treated titanium dioxide, and dextrin palmitate-treated iron oxide.

[0021] When a powder component is blended, the blending amount is preferably 0.1 to 30 mass %, more preferably 5 to 20 mass %, of the total amount of the water-in-oil emulsion cosmetic. If the blending amount of the powder component is too high, the spreadability upon application tends to be impaired.

[0022] <Manufacturing method / Usage> The water-in-oil emulsion cosmetic of the present invention can be prepared by a conventional method, and the emulsification method is not particularly limited. For example, an example includes a method in which an aqueous phase containing (A) a water-soluble thickener and an oil phase containing at least one of (B) an emulsifiable crosslinked elastomer and (C) a metal soap are each heated to about 70°C, and then the aqueous phase is gradually added to the oil phase, emulsified in an emulsifier, and allowed to cool to room temperature. However, the method is not limited to this.

[0023] The water-in-oil emulsion cosmetic of the present invention can be widely applied to cosmetics, and can be used as, for example, an emulsion foundation, a suncare cosmetic, a makeup base, and the like.

[0024] Furthermore, the present invention is not limited to a specific container configuration. For example, the cosmetic product can be impregnated into an impregnated body and stored in an airtight compact container. Examples of impregnated bodies include nonwoven fabrics made of a single or mixed material such as resin, pulp, or cotton; resin-treated fibers; foams such as sponge; and porous bodies with open pores. Examples of materials for the impregnated body include NBR (acrylonitrile butadiene rubber), SBR (styrene butadiene rubber), NR (natural rubber), urethane, nylon, polyolefin, polyester, EVA (ethylene vinyl acetate), PVA (polyvinyl alcohol), silicone, and elastomer. However, the impregnated body is not limited to these materials as long as it can contain the cosmetic product. Applicators for extracting the cosmetic material from the impregnated body and applying it to the skin include sponges, puffs, tips, and the like that are typically used when applying liquid cosmetics to the skin.

[0025] The water-in-oil emulsion cosmetic of the present invention can also be packaged as a concentrate for an aerosol cosmetic. The propellant is not particularly limited as long as it is a propellant commonly used in aerosol cosmetics. Examples include liquefied petroleum gas, dimethyl ether, nitrogen, oxygen, carbon dioxide, and chlorofluorocarbons. One or more of these propellants can be filled into an aerosol can along with the concentrate in a conventional manner to produce an aerosol cosmetic. [Example]

[0026] The present invention will be described in more detail below with reference to examples, but the present invention is not limited to these examples. Unless otherwise specified, the blending amount is expressed in mass % relative to the system in which the component is blended. Before describing each example in detail, the evaluation methods used will be described.

[0027] A water-in-oil emulsion cosmetic having the composition shown in Table 1 below was prepared by heating the oily ingredients to dissolve them and disperse the powder, then adding a separately dissolved aqueous phase and emulsifying by stirring. The obtained cosmetic was subjected to a practical use test by a panel of 10 experts, who evaluated the smoothness, non-stickiness, and fit according to the following evaluation criteria. <Evaluation criteria> A: 9 or more panelists rated it as good B: 6-8 panelists rated it as good C: 3 to 5 panelists rated it as good D: Two or fewer panelists rated it as good

[0028] [Table 1] *1 KSG-360Z (Shin-Etsu Chemical Co., Ltd.) Actual content 30-40%

[0029] As shown in Table 1, when a water-soluble thickener was blended in the aqueous phase and a metal soap was blended in the oil phase, extremely excellent results were obtained in all evaluation items (Examples 1 to 8). In particular, when zinc myristate was blended as the metal soap, a tendency for excellent fitting was observed regardless of the type of water-soluble thickener combined. Furthermore, a tendency for excellent non-stickiness was observed when a polysaccharide-based thickener was blended as the water-soluble thickener rather than a synthetic polymer-based thickener. On the other hand, when the oil phase contained neither a metal soap nor an emulsifiable crosslinked elastomer, the smoothness was inferior (Comparative Example 1), and when the oil phase contained no water-soluble thickener, the lack of stickiness was excellent but the fit was inferior (Comparative Example 4).Furthermore, when an oil-soluble thickener commonly used in cosmetics was blended in place of the metal soap, significant stickiness occurred (Comparative Examples 2 and 3).

[0030] A water-in-oil emulsion cosmetic having the composition shown in Table 2 below was prepared by heating the oily ingredients to dissolve them and disperse the powder, then adding a separately dissolved aqueous phase and emulsifying by stirring. The obtained cosmetic was subjected to a practical use test by a panel of 10 experts, who evaluated the smoothness, non-stickiness, and fit as well as the freshness and spreadability during application according to the following evaluation criteria. <Evaluation criteria> A: 9 or more panelists rated it as good B: 6-8 panelists rated it as good C: 3 to 5 panelists rated it as good D: Two or fewer panelists rated it as good

[0031] [Table 2] *1 KSG-360Z (Shin-Etsu Chemical Co., Ltd.) Actual content 30-40%

[0032] As shown in Table 2, when cellulose nanofiber was blended as a water-soluble thickener in the aqueous phase and at least one of an emulsifiable crosslinked elastomer and a metal soap was blended in the oil phase, extremely excellent results were obtained in all evaluation items (Examples 10 to 16). On the other hand, when no water-soluble thickener was included, or when other oil-soluble thickeners commonly used in cosmetics were blended in place of the emulsifiable crosslinked elastomer and metal soap, satisfactory results were not obtained in several evaluation items (Comparative Examples 5 to 7).

[0033] The formulations of the cosmetic of the present invention are exemplified below. It goes without saying that the present invention is not limited to these formulation examples and is defined by the claims. All blend amounts are expressed in mass % relative to the total amount of the cosmetic.

[0034] Formulation example 1: Foundation (Ingredient name) Compounding amount (mass%) Dimethicone 20 Diphenylsiloxyphenyl Trimethicone 10 PEG-10 Dimethicone 4 (PEG-15 / Lauryl Polydimethylsiloxyethyl Dimethicone) Crosspolymer (KSG-360Z (Shin-Etsu Chemical Co., Ltd.) Actual content 30-40%) 5 Sorbitan sesquiisostearate 2 Ethylhexyl methoxycinnamate 5 Zinc myristate 0.5 (Vinyl dimethicone / methicone silsesquioxane) crosspolymer 2 Nylon-12 2 Silica dimethyl silylate 1 Hydrophobic treated pigment grade titanium dioxide 10 Hydrophobic treated red iron oxide 0.7 Hydrophobic treated yellow iron oxide 1.5 Hydrophobic treated black iron oxide 0.1 Wednesday 29.98 Glycerin 5 Preservatives 0.2 Cellulose nanofiber 1 Hydroxyethyl cellulose 0.02

[0035] Formulation example 2: Concealer (Ingredient name) Compounding amount (mass%) Dimethicone 20 Diphenylsiloxyphenyl Trimethicone 10 PEG-10 Dimethicone 4 Dimethicone / PEG-10 / 15 Crosspolymer 5 Sorbitan sesquiisostearate 2 Zinc myristate 0.5 (Vinyl dimethicone / methicone silsesquioxane) crosspolymer 3 Nylon-12 2 Hydrophobic treated pigment grade titanium dioxide 12 Hydrophobic treated red iron oxide 0.7 Hydrophobic treated yellow iron oxide 1.5 Hydrophobic treated black iron oxide 0.1 Wednesday 32.98 Glycerin 5 Preservatives 0.2 Cellulose nanofiber 1 Hydroxyethyl cellulose 0.02

[0036] Formulation example 3: BB cream (Ingredient name) Compounding amount (mass%) Dimethicone 20 Diphenylsiloxyphenyl Trimethicone 10 PEG-10 Dimethicone 2 (Dimethicone / Polyglycerin-3) Crosspolymer 5 Lauryl PEG-9 Polydimethylsiloxyethyl Dimethicone 2 Sorbitan sesquiisostearate 2 Ethylhexyl methoxycinnamate 3 Zinc myristate 0.5 (Vinyl dimethicone / methicone silsesquioxane) crosspolymer 2 Nylon-12 2 Silica dimethyl silylate 0.5 Hydrophobic treated pigment grade titanium dioxide 6 Hydrophobic treated red iron oxide 0.7 Hydrophobic treated yellow iron oxide 1.5 Hydrophobic treated black iron oxide 0.1 Wednesday 36.48 Glycerin 5 Preservatives 0.2 Cellulose nanofiber 1 Hydroxyethyl cellulose 0.02

[0037] Formulation example 4: Eye shadow (Ingredient name) Compounding amount (mass%) Dimethicone 20 Diphenylsiloxyphenyl Trimethicone 10 PEG-10 Dimethicone 4 (PEG-15 / Lauryl Polydimethylsiloxyethyl Dimethicone) Crosspolymer (KSG-360Z (Shin-Etsu Chemical Co., Ltd.) Actual content 30-40%) 5 Sorbitan Sesquiisostearate 3 Zinc myristate 0.5 Silicone-treated red iron oxide coated mica titanium 5 Silicone-treated red iron oxide coated mica 5 Hydrophobic treated pigment grade titanium dioxide 10 Hydrophobic treated red iron oxide 0.7 Hydrophobic treated yellow iron oxide 1.5 Hydrophobic treated black iron oxide 0.1 Wednesday 28.98 Glycerin 5 Preservatives 0.2 Cellulose nanofiber 1 Hydroxyethyl cellulose 0.02

[0038] Prescription example 5: Skin care cream (Ingredient name) Compounding amount (mass%) Dimethicone 20 Diphenylsiloxyphenyl Trimethicone 10 PEG-10 Dimethicone 4 (PEG-15 / Lauryl Polydimethylsiloxyethyl Dimethicone) Crosspolymer (KSG-360Z (Shin-Etsu Chemical Co., Ltd.) Actual content 30-40%) 5 Sorbitan sesquiisostearate 1 Zinc myristate 0.5 (Vinyl dimethicone / methicone silsesquioxane) crosspolymer 2 Wednesday 51.28 Glycerin 5 Preservatives 0.2 Cellulose nanofiber 1 Hydroxyethyl cellulose 0.02

[0039] Formulation example 6: Sunscreen (Ingredient name) Compounding amount (mass%) Dimethicone 20 Diphenylsiloxyphenyl Trimethicone 10 PEG-10 Dimethicone 4 (PEG-15 / Lauryl Polydimethylsiloxyethyl Dimethicone) Crosspolymer (KSG-360Z (Shin-Etsu Chemical Co., Ltd.) Actual content 30-40%) 5 Sorbitan sesquiisostearate 2 Ethylhexyl methoxycinnamate 7.5 Zinc myristate 0.5 Hydrophobic treated zinc oxide 3 Hydrophobic treated pigment grade titanium dioxide 8 Hydrophobic treated titanium dioxide particles 5 Hydrophobic treated red iron oxide 0.7 Hydrophobic treated yellow iron oxide 1.5 Hydrophobic treated black iron oxide 0.1 Wednesday 26.48 Glycerin 5 Preservatives 0.2 Cellulose nanofiber 1 Hydroxyethyl cellulose 0.02

[0040] The present invention includes the following aspects. [Section 1] The internal phase contains (A) a water-soluble thickener, and The external phase contains at least one of (B) an emulsifying crosslinked elastomer and (C) a metal soap. Water-in-oil emulsion cosmetics. [Section 2] 2. The water-in-oil emulsion cosmetic according to claim 1, wherein the water-soluble thickener (A) is a polysaccharide thickener. [Section 3] 3. The water-in-oil emulsion cosmetic according to claim 1 or 2, comprising two or more polysaccharide thickeners as the water-soluble thickener (A). [Section 4] (A) The water-in-oil emulsion cosmetic according to any one of items 1 to 3, comprising cellulose nanofibers as a water-soluble thickener. [Section 5] (B) The water-in-oil emulsion cosmetic according to any one of items 1 to 4, wherein the emulsifying crosslinked elastomer is a silicone crosslinked product crosslinked with a polyether chain or a polyglycerin chain. [Section 6] (C) The water-in-oil emulsion cosmetic according to any one of items 1 to 5, wherein the metal soap is zinc myristate.

Claims

1. The internal phase contains (A) a water-soluble thickener, and The external phase contains (C) a metal soap, (A) Contains cellulose nanofiber as a water-soluble thickener; Water-in-oil emulsion cosmetics.

2. (A) A water-in-oil emulsion cosmetic as described in claim 1, wherein the water-soluble thickener is a polysaccharide-based thickener.

3. (A) A water-in-oil emulsion cosmetic as described in claim 1 or 2, comprising two or more polysaccharide-based thickeners as water-soluble thickeners.

4. A water-in-oil emulsion cosmetic described in any one of claims 1 to 3, wherein (C) the metal soap is zinc myristate.