Multi-layer cosmetics

Abstract

The present invention aims to provide a multilayered cosmetic with high emulsion particle stability, particularly high high-temperature stability and freeze-thaw stability, and rapid separation of the emulsion layer from the aqueous layer. This solution is achieved by providing a multilayered cosmetic comprising: (A) one or more nonionic surfactants having a weighted average HLB value of 8.5 or greater; (B) an ionic surfactant; (C) one or more cellulose derivatives selected from alkylcelluloses and hydroxyalkylcelluloses; (D) an oily component; and (E) water.

Description

Technical Field

[0001] The present invention relates to a liquid multi-layer cosmetic comprising an emulsion layer. Background Art

[0002] Multilayer cosmetics are liquid cosmetics composed of two or more layers, such as an oil-water layer or a water-powder layer. Because they can also contain oils, they offer advantages such as a feel and a cleansing effect that are not possible with a single layer. However, in the case of multilayer cosmetics composed of an oil-water layer, each layer appears almost transparent, making it difficult to identify them as multilayered at first glance.

[0003] Therefore, a method has been proposed to emulsify the oil component to form emulsion particles, which become turbid, and separate the emulsion into a turbid emulsion layer in which the oil component remains in the emulsified state and a transparent water layer, thereby clearly creating a multi-layered cosmetic (Patent Documents 1 and 2). The multi-layered cosmetics described in these patent documents form the emulsion layer by adding a surfactant.

[0004] Prior art literature

[0005] Patent Literature

[0006] Patent Document 1: Japanese Patent No. 3794542

[0007] Patent Document 2: Japanese Patent Application Laid-Open No. 2002-3339 Summary of the Invention

[0008] Problems to be solved by the invention

[0009] Generally, after temporarily emulsifying oil, the emulsified particles gradually coalesce into large oil droplets over time after standing, concentrating at the top and forming a partially transparent oil layer, resulting in a multilayered cosmetic with an uneven appearance. While the multilayered cosmetics described in the aforementioned patent documents are characterized by low emulsified particle aggregation and a relatively high level of stability, further improvements are desired, particularly in terms of enhancing the stability of the emulsified particles during temperature fluctuations.

[0010] The present invention has been made in view of the above circumstances, and its object is to provide a multilayer cosmetic in which the stability of emulsion particles, particularly high temperature stability and freezing stability, is high and the separation of the emulsion layer and the aqueous layer is rapid.

[0011] Methods for solving problems

[0012] The multi-layer cosmetic of the present invention comprises:

[0013] (A) one or more nonionic surfactants having a weighted average HLB value of 8.5 or greater;

[0014] (B) an ionic surfactant;

[0015] (C) one or more cellulose derivatives selected from alkyl celluloses and hydroxyalkyl celluloses;

[0016] (D) an oily component; and

[0017] (E) Water.

[0018] (B) The ionic surfactant is preferably an anionic surfactant or an amphoteric surfactant.

[0019] (B) The ionic surfactant is more preferably an anionic surfactant.

[0020] The mass ratio of the (B) ionic surfactant to the (A) nonionic surfactant is preferably 0.05 to 2.5.

[0021] (A) The nonionic surfactant is preferably contained in an amount of 0.01 to 1% by mass based on the total amount of the cosmetic.

[0022] (B) The ionic surfactant is preferably contained in an amount of 0.005 to 0.5% by mass based on the total amount of the cosmetic.

[0023] (D) The oily component may be contained in an amount of 10% by mass or more based on the total amount of the cosmetic.

[0024] Effects of the Invention

[0025] The multi-layered cosmetic of the present invention comprises:

[0026] (A) one or more nonionic surfactants having a weighted average HLB value of 8.5 or greater;

[0027] (B) an ionic surfactant;

[0028] (C) one or more cellulose derivatives selected from alkyl celluloses and hydroxyalkyl celluloses;

[0029] (D) an oily component; and

[0030] (E) Water,

[0031] Therefore, it is possible to produce a cosmetic material in which the stability of the emulsion particles, particularly the high temperature stability and the freezing stability, and the separation of the emulsion layer and the water layer is rapid. DETAILED DESCRIPTION

[0032] Hereinafter, the multi-layered cosmetic of the present invention will be described in detail.

[0033] The multilayer cosmetic of the present invention (hereinafter also referred to as simply a cosmetic) comprises:

[0034] (A) one or more nonionic surfactants having a weighted average HLB value of 8.5 or greater;

[0035] (B) an ionic surfactant;

[0036] (C) one or more cellulose derivatives selected from alkyl celluloses and hydroxyalkyl celluloses;

[0037] (D) an oily component; and

[0038] (E) Water.

[0039] Hereinafter, each component will be described in detail. In this specification, PEG is an abbreviation for polyethylene glycol, EO is an abbreviation for ethylene oxide, PO is an abbreviation for propylene oxide, POE is an abbreviation for polyoxyethylene, and POP is an abbreviation for polyoxypropylene.

[0040] (A) One or more nonionic surfactants having a weighted average HLB value of 8.5 or more

[0041] The (A) nonionic surfactant used in the present invention can be used alone or in combination of two or more as long as the weighted average of the HLB (Hydrophilic-Lipophilic Balance) value is 8.5 or more. The so-called HLB is generally a value that represents the affinity of a surfactant for water and oil, and is a parameter known as the hydrophilic-lipophilic balance. For example, it can be obtained by a well-known calculation method such as the Griffey method. By having a weighted average of the HLB value of 8.5 or more, the oil component can be emulsified and the stability of the emulsified particles can be improved. The weighted average of the HLB value is more preferably 8.5 or more and 18 or less, and is further expected to be 9 or more and 14 or less. Among nonionic surfactants, from the viewpoint of higher emulsification stability, it is preferred to use a hydrophilic nonionic surfactant in the multilayer cosmetic of the present invention.

[0042] Specifically, as the hydrophilic nonionic surfactant, for example, POE-sorbitan fatty acid esters (for example, POE-sorbitan monooleate, POE-sorbitan monostearate, POE-sorbitan tetraoleate, etc.); POE sorbitan fatty acid esters (for example, POE-sorbitan monolaurate, POE-sorbitan monooleate, POE-sorbitan pentaoleate, POE-sorbitan monostearate, etc.); POE-glycerol fatty acid esters (for example, POE-glycerol monolaurate, POE-sorbitan monooleate, POE-sorbitan pentaoleate, POE-sorbitan monostearate, etc.); stearate, POE-glyceryl monoisostearate, POE-glyceryl triisostearate, etc. POE-monooleate, etc.); polyglyceryl fatty acids (for example, polyglyceryl diisostearate-10, etc.); POE fatty acid esters (for example, POE-distearate, POE-monodioleate, glycol distearate, etc.); POE alkyl ethers (for example, POE-lauryl ether, POE-oleyl ether, POE-stearyl ether, POE-behenyl ether, POE-2-octyldodecyl ether, POE-cholestanol ether, etc.); POE- Poloxamer type (for example, poloxamer, etc.); POE / POP-alkyl ethers (for example, POE / POP-cetyl ether, POE / POP-2-decyltetradecyl ether, POE / POP-monobutyl ether, POE / POP-hydrogenated lanolin, POE / POP-glycerol ether, etc.); tetra-POE / tetra-POP-ethylenediamine condensates (for example, TETRONIC, etc.); POE-castor oil / POE-hardened castor oil derivatives (for example, POE-castor oil, POE-hardened castor oil, POE-hardened castor oil, etc.); Oil monoisostearate, POE-hardened castor oil triisostearate, POE-hardened castor oil monopyroglutamic acid monoisostearate diester, POE-hardened castor oil maleic acid, etc.); POE-beeswax / lanolin derivatives (for example, POE-sorbitol beeswax, etc.); alkanolamides (for example, coconut fatty acid diethanolamide, lauric acid monoethanolamide, fatty acid isopropanolamide, etc.); POE-propylene glycol fatty acid esters; POE-alkylamines; POE-fatty acid amides; sucrose fatty acid esters; alkyl ethoxydimethylamine oxide; trioleyl phosphoric acid, etc.

[0043] More preferable examples include POE-glyceryl fatty acid esters such as PEG-20 glyceryl isostearate and PEG-5 glyceryl stearate.

[0044] On the other hand, examples of the lipophilic nonionic surfactant include sorbitan fatty acid esters (e.g., sorbitan monooleate, sorbitan monoisostearate, sorbitan monolaurate, sorbitan monopalmitate, sorbitan monostearate, sorbitan sesquioleate, sorbitan trioleate, sorbitan diglycerol penta-2-ethylhexanoate, sorbitan diglycerol tetra-2-ethylhexanoate, etc.); glycerol polyglycerol fatty acids (e.g., cottonseed oil fatty acid glyceryl ester, glyceryl monoerucate, glyceryl sesquioleate, etc.); Esters; POE-glyceryl fatty acid esters having a low HLB due to a small number of added EO groups and / or a large number of fatty acid residues (e.g., PEG-6 distearate, PEG-12 diisostearate, etc.), glyceryl monostearate, α,α'-oleyl pyroglutamate glyceryl monostearate, glyceryl malate, etc.); propylene glycol fatty acid esters (e.g., propylene glycol monostearate, etc.); POE-castor oil / POE-hydrogenated castor oil derivatives having a low HLB due to a small number of added EO groups (e.g., PEG-10 hydrogenated castor oil, etc.), hydrogenated castor oil derivatives; glyceryl alkyl ethers, etc.

[0045] More preferred examples include PEG-10 hydrogenated castor oil, PEG-6 distearate, and PEG-12 diisostearate.

[0046] The amount of the nonionic surfactant (A) incorporated is not particularly limited as long as the weighted average HLB value is 8.5 or greater, but is preferably 0.01 to 1% by mass, more preferably 0.05 to 0.5% by mass, relative to the total amount of the cosmetic. An amount of 0.01% by mass or greater can further improve emulsion stability, while an amount of 1% by mass or less can further maintain the stability of the emulsion particles and suppress stickiness when applied to the skin.

[0047] (B) Ionic surfactants

[0048] Examples of the (B) ionic surfactant used in the present invention include anionic surfactants, cationic surfactants, and amphoteric surfactants. From the viewpoint of higher emulsification stability, anionic surfactants and amphoteric surfactants are more preferable.

[0049] (Anionic surfactant)

[0050] Examples of the anionic surfactant include higher fatty acid amide sulfonates, fatty acid soaps, N-acyl glutamates, carboxylates such as alkyl ether acetic acid, sulfonic acid such as α-olefin sulfonates, alkane sulfonates, alkylbenzene sulfonic acid, sulfate esters such as higher alcohol sulfates, and phosphate esters. More preferred examples include higher fatty acid amide sulfonates such as sodium stearoyl methyl taurate, sodium lauroyl methyl taurate, sodium myristoyl methyl taurate, and sodium palmitoyl methyl taurate.

[0051] (amphoteric surfactant)

[0052] Examples of the amphoteric surfactant include carboxybetaine-type amphoteric surfactants such as alkyl betaine and alkylamide betaine, sulfobetaine-type amphoteric surfactants such as alkyl sulfobetaine and alkylhydroxysulfobetaine, phosphonobetaine-type amphoteric surfactants, imidazoline-type amphoteric surfactants, and amidoamino acid salts. Among the amphoteric surfactants, alkyl betaine is more preferably used from the viewpoint of versatility.

[0053] Examples of alkyl betaines include lauryl betaine and lauryl dimethylaminoacetic acid betaine. Examples of alkyl amido betaines include coconut oil fatty acid amidopropyl betaine. Examples of alkyl sulfobetaines include coconut oil fatty acid dimethyl sulfopropyl betaine. Examples of alkyl hydroxysulfobetaines include lauryl dimethylaminohydroxysulfobetaine. Examples of phosphonobetaine-type amphoteric surfactants include lauryl hydroxyphosphonobetaine. Examples of imidazoline-type amphoteric surfactants include coconut oil alkyl-N-hydroxyethyl imidazoline. Betaine, etc.

[0054] The ionic surfactant (B) is preferably included in an amount of 0.005 to 0.5% by mass, more preferably 0.008 to 0.2% by mass, relative to the total amount of the cosmetic. When the ionic surfactant (B) is included in an amount of 0.005% by mass or more relative to the total amount of the cosmetic, the emulsion stability can be further improved, while when it is included in an amount of 0.5% by mass or less, the stability of the emulsion particles can be further maintained and stickiness when applied to the skin can be suppressed.

[0055] The mass ratio of the ionic surfactant (B) to the nonionic surfactant (A) depends on the type of surfactant selected, but is preferably 0.05 to 2.5, more preferably 0.08 to 1.5. A mass ratio of 0.05 or greater for the ionic surfactant (B) to the nonionic surfactant (A) further improves emulsion stability, while a mass ratio of 2.5 or less further maintains the stability of the emulsion particles and suppresses stickiness when applied to the skin.

[0056] (C) one or more cellulose derivatives selected from alkyl celluloses and hydroxyalkyl celluloses

[0057] The (C) cellulose derivatives (hereinafter also referred to as "cellulose derivatives") used in the present invention are those in which the hydroxyl groups of a polymer having a cellulose skeleton are modified (substituted) with alkyl groups or hydroxyalkyl groups. Examples thereof include alkyl celluloses such as methyl cellulose, ethyl cellulose, and propyl cellulose; and hydroxyalkyl celluloses such as carboxymethyl-modified carboxymethyl cellulose, hydroxyethyl cellulose, hydroxypropyl cellulose, hydroxypropylmethyl cellulose, and hydroxybutyl cellulose. Alkali metal salts of these may also be used.

[0058] The cellulose derivative (C) is preferably included in an amount of 0.01 to 0.5% by mass, more preferably 0.03 to 0.3% by mass, and even more desirably 0.05 to 0.25% by mass relative to the total amount of the cosmetic. When the cellulose derivative (C) is included in an amount of 0.01% by mass or more relative to the total amount of the cosmetic, the separation of the emulsion layer and the aqueous layer can be accelerated. When the cellulose derivative (C) is included in an amount of 0.5% by mass or less, the separation speed of the emulsion layer and the aqueous layer can be accelerated, and stickiness when applied to the skin can be further suppressed.

[0059] (D) Oily ingredients

[0060] The (D) oily component used in the present invention is not particularly limited, and any of liquid oils such as polar oil, silicone oil, non-polar oil, solid oil, semi-solid oil, etc. can be used. The multi-layer cosmetic of the present invention can contain an oily component of 10% by mass or more relative to the total amount of the cosmetic. Generally, the oily component acts in a direction that makes the emulsification unstable, but the multi-layer cosmetic of the present invention can be highly formulated with the oily component due to its extremely high stability. The oily component can be 10 to 30% by mass relative to the total amount of the cosmetic, more preferably 10 to 25% by mass, and further 10 to 20% by mass. By being 30% by mass or less, the emulsification stability can be further improved.

[0061] The polar oil is generally not particularly limited as long as it is used in cosmetics, pharmaceuticals, or foods. The IOB value is not particularly limited, but is preferably 0.05 to 0.80.

[0062] The IOB value is short for Inorganic / Organic Balance and represents the ratio of the inorganic value to the organic value. It is an indicator of the polarity of an organic compound. Specifically, the IOB value is expressed as the following formula.

[0063] IOB value = inorganic value / organic value

[0064] Here, regarding the "inorganic value" and "organic value", for example, the "organic value" for one carbon atom in the molecule is set to 20, and the "inorganic value" for one hydroxyl group in the molecule is set to 100. By setting the "inorganic value" and "organic value" corresponding to various atoms or functional groups, the "inorganic value" and "organic value" of all atoms and functional groups in the organic compound are accumulated, and the IOB value of the organic compound can be calculated (for example, refer to Fujita, "The Field of Chemistry (Chemical Field)", Vol. 11, No. 10, pp. 719-725, 1957).

[0065] Representative examples of polar oils include ester oils and ultraviolet absorbers.

[0066] Specific examples of the ester oil include tripropylene glycol dipivalate, isononyl isononanoate, isopropyl myristate, cetyl octanoate, octyldodecyl myristate, isopropyl palmitate, butyl stearate, hexyl laurate, myristyl myristate, decyl oleate, hexyldecyl dimethyloctanoate, cetyl lactate, myristyl lactate, lanolin acetate, isocetyl stearate, isocetyl isostearate, cholesteryl 12-hydroxystearate, cetyl ethylhexanoate, ethylene glycol di-2-ethylhexanoate, dipentaerythritol fatty acid ester, N-alkyl glycol monoisostearate, neopentyl glycol dicaprate, diisostearyl malate, glyceryl di-2-heptylundecanoate, trimethylolpropane tri-2-ethylhexanoate, trimethylolpropane triisostearate, tetra- Pentaerythritol 2-ethylhexanoate, triisooctanoin (tri-2-ethylhexanoin), tricaprylin, triisopalmitin, trimethylolpropane triisostearate, cetyl 2-ethylhexanoate, 2-ethylhexyl palmitate, trimyristin, tri-2-heptylundecanoic acid glyceryl, castor oil fatty acid methyl ester, oleyl oleate, acetylated glyceryl, 2-heptylundecanoic acid, diisobutyl adipate, 2-octyldodecyl N-lauroyl-L-glutamate, di-2-heptylundecanoic acid, ethyl laurate, di-2-ethylhexyl sebacate, 2-hexyldecyl myristate, 2-hexyldecyl palmitate, 2-hexyldecyl adipate, diisopropyl sebacate, 2-ethylhexyl succinate, triethyl citrate, etc.

[0067] As ultraviolet absorbers, highly polar oil-soluble ultraviolet absorbers used in general cosmetics can be widely cited, and there is no particular limitation. Examples include benzoic acid derivatives, salicylic acid derivatives, cinnamic acid derivatives, dibenzoylmethane derivatives, β,β-diphenylacrylate derivatives, benzophenone derivatives, benzylidene camphor derivatives, phenylbenzimidazole derivatives, triazine derivatives, phenylbenzotriazole derivatives, phthalic anhydride derivatives, imidazoline derivatives, benzylidene malonate derivatives, 4,4-diarylbutadiene derivatives, etc. Specific examples and trade names are listed below, but are not limited thereto.

[0068] As benzoic acid derivatives, examples include ethyl p-aminobenzoate (PABA), ethyl-dihydroxypropyl PABA, ethylhexyl-dimethyl PABA (e.g., "Escalol 507"; ISP), glyceryl PABA, PEG-25-PABA (e.g., "Uvinul P25"; BASF), diethylamino hydroxybenzoyl benzoic acid hexyl ester (e.g., "Uvinul A Plus"), etc.

[0069] As salicylic acid derivatives, examples include salicylic acid homomenthyl ester ("Eusolex HMS"; Rohm / EM Industries), ethylhexyl salicylate (e.g., "NeoHeliopan OS"; Harman & Reimer), dipropylene glycol salicylate (e.g., "Dipsal"; Schering), TEA salicylate (e.g., "NeoHeliopan TS"; Harman & Reimer), etc.

[0070] As cinnamic acid derivatives, examples include octyl methoxycinnamate or ethylhexyl methoxycinnamate (e.g., "Parsol MCX"; Hoffmann-La Roche), isopropyl methoxycinnamate, isoamyl methoxycinnamate (e.g., "NeoHeliopan E1000"; Harman & Reimer), cinoxate, DEA methoxycinnamate, diisopropyl methylcinnamate, glyceryl-ethylhexanoate-dimethoxycinnamate, bis-(2-ethylhexyl)-4'-methoxybenzylidene malonate, etc.

[0071] As dibenzoylmethane derivatives, examples include 4-tert-butyl-4'-methoxydibenzoylmethane (e.g., "Parsol 1789"), etc.

[0072] As β,β-diphenylacrylate derivatives, examples include octocrylene (e.g., "Uvinul N539"; BASF), etc.

[0073] Examples of benzophenone derivatives include benzophenone-1 (e.g., "Yubinal 400"; BASF), benzophenone-2 (e.g., "Yubinal D50"; BASF), benzophenone-3 or oxybenzone (e.g., "Yubinal M40"; BASF), benzophenone-4 (e.g., "Yubinal MS40"; BASF), benzophenone -5. Benzophenone-6 (for example, "Helisorb 11"; Noriku Aya Co., Ltd.), benzophenone-8 (for example, "Helisorb-11" (Spectr a-Sorb) UV-24"; Amerikan·Amanil Co., Ltd.), benzophenone-9 (for example, "A-Sorb) UV-24"; BASF Co., Ltd.), benzophenone-12, etc.

[0074] Examples of benzylidene camphor derivatives include 3-benzylidene camphor (e.g., "Mexoryl SD"; Shimex Co., Ltd.), 4-methylbenzylidene camphor, benzylidene camphorsulfonic acid (e.g., anisotriazine such as "Mexoryl SL"; Shimex Co., Ltd.), benzalkonium methylsulfate camphorbenzyl ammonium (e.g., "Mexoryl SO"; Shimex Co., Ltd.), terephthalylidene dicamphorsulfonic acid (e.g., "Mexoryl SX"; Shimex Co., Ltd.), and polyacrylamide methylbenzylidene camphor (e.g., "Mexoryl SW"; Shimex Co., Ltd.).

[0075] Examples of the phenylbenzimidazole derivative include phenylbenzimidazole sulfonic acid (e.g., "Yusolex 232"; Melku), disodium phenyldibenzimidazole tetrasulfonate (e.g., "Neo Heliopan AP"; Harman Ando Raymer), and the like.

[0076] Examples of the triazine derivative include bis-ethylhexyloxyphenol methoxyphenyltriazine (anisotriazine) (e.g., “Tinosorb S”; Chiba Spessary Chemicals Co., Ltd.), ethylhexyl triazone (e.g., “Uvinal T150”; BASF), diethylhexyl butyramido triazone (e.g., “Uvasorb HEB”; Shigma 3V Co., Ltd.), and 2,4,6-tris(diisobutyl-4′-aminobenzylidenemalonate)-s-triazine.

[0077] Examples of phenylbenzotriazole derivatives include drometrizole trisiloxane (e.g., “Silatrizole”; Lodia Shimizu Co., Ltd.), methylenebis(benzotriazolyltetramethylbutylphenol) (e.g., “Chinosob M”; Chiba Spesialty Chemicarzu Co., Ltd.), and the like.

[0078] Examples of anthranilic anhydride derivatives include anthranilic acid and anthranilic acid. Esters (for example, "ネオ・ヘリオパンMA"; ハーマン・アンド・レイマー Co., Ltd.), etc.

[0079] Examples of the imidazoline derivative include ethylhexyldimethoxybenzylidenedioxoimidazolinium propionate and the like.

[0080] Examples of the benzal malonate derivative include polyorganosiloxane having a benzal malonate functional group (for example, polysilicone-15; "Parsol SLX"; DSM Nitrosil Japan Ltd.).

[0081] Examples of the 4,4-diarylbutadiene derivative include 1,1-dicarboxy(2,2′-dimethylpropyl)-4,4-diphenylbutadiene and the like.

[0082] The polar oil may be used alone or in combination of two or more.

[0083] Examples of the silicone oil include chain silicone oils such as dimethylpolysiloxane, methylphenylpolysiloxane, and methylhydrogenpolysiloxane; and cyclic silicone oils such as octamethylcyclotetrasiloxane, decamethylcyclopentasiloxane, and dodecamethylcyclohexasiloxane.

[0084] Examples of the nonpolar oil include hydrocarbon oils such as liquid paraffin, squalane, squalene, paraffin, and isohexadecane.

[0085] Examples of the solid oil component include solid oils and fats such as cocoa butter, coconut oil, horse oil, hydrogenated coconut oil, palm oil, beef tallow, mutton tallow, and hydrogenated castor oil; hydrocarbons such as paraffin wax (straight-chain hydrocarbon), microcrystalline wax (branched-chain saturated hydrocarbon), ceresin, wood wax, and Fischer-Tropsch wax; beeswax, carnauba wax, candelilla wax, rice bran wax, spermaceti wax, jojoba oil, bran wax, montan wax, kapok wax, bayberry wax, shellac wax, sugarcane wax; waxes such as lanolin fatty acid isopropyl ester, hexyl laurate, reduced lanolin, hard lanolin, POE lanolin alcohol ether, POE lanolin alcohol acetate, POE cholesterol ether, lanolin fatty acid polyethylene glycol ester, and POE hydrogenated lanolin alcohol ether; and higher fatty acids such as myristic acid, palmitic acid, stearic acid, and behenic acid.

[0086] Examples of the semi-solid oil component include plant oils and fats such as petrolatum, lanolin, shea butter, partially hydrogenated coconut oil, partially hydrogenated jojoba oil, bis-diglyceryl polyacyladipate-2, pentaerythritol tetra(behenic acid / benzoic acid / ethylhexanoate), macadamia nut oil polyglyceryl-6-ester behenate, dimer dilinoleate (phytosteryl / behenyl), and dipentaerythritol hexahydroxystearate.

[0087] (E) Water

[0088] The water may be ion-exchanged water or purified water.

[0089] The amount of (E) water to be incorporated depends on the product form of the multilayered cosmetic, but is preferably 40 to 95% by mass, more preferably 55 to 90% by mass, and further preferably 60 to 85% by mass relative to the total amount of the cosmetic.

[0090] In the multilayer cosmetic of the present invention, any optional ingredients other than the above-mentioned essential ingredients may be added as long as the effects of the present invention are not impaired. Generally, any optional cosmetic can be produced by conventional methods by adding ingredients to the cosmetic. Examples of the optional ingredients include humectants, sequestrants, antioxidants, and various pharmaceutical agents.

[0091] Examples of the moisturizing agent include polyethylene glycol, propylene glycol, glycerin, 1,3-butylene glycol, xylitol, sorbitol, maltitol, chondroitin sulfate, hyaluronic acid, mucin sulfate, calonic acid, atelocollagen, cholesteryl-12-hydroxystearate, sodium lactate, bile acid salts, d,l-pyrrolidonecarboxylate, short-chain soluble collagen, diglycerol (EO)PO ((ethylene oxide)propylene oxide) adduct, smilax china flower extract, Achillea millefolium extract, Melilotus officinalis plant extract, trehalose, erythritol, and POE / POP random copolymer methyl ether.

[0092] Examples of the sequestrant include 1-hydroxyethane-1,1-diphosphonic acid, tetrasodium 1-hydroxyethane-1,1-diphosphonic acid, disodium ethylenediaminetetraacetate, trisodium ethylenediaminetetraacetate, tetrasodium ethylenediaminetetraacetate, sodium citrate, sodium polyphosphate, sodium metaphosphate, gluconic acid, phosphoric acid, citric acid, ascorbic acid, succinic acid, ethylenediaminetetraacetic acid, and trisodium ethylenediaminehydroxyethyltriacetate.

[0093] Examples of the vitamins include vitamins A, B1, B2, B6, C, E and derivatives thereof, pantothenic acid and derivatives thereof, and biotin.

[0094] Examples of the antioxidant include tocopherols, butylated hydroxytoluene, butylated hydroxyanisole, and gallic acid esters.

[0095] Examples of the antioxidant aid include phosphoric acid, citric acid, ascorbic acid, maleic acid, malonic acid, succinic acid, fumaric acid, cephalin, hexametaphosphate, phytic acid, and ethylenediaminetetraacetic acid.

[0096] Other ingredients that can be incorporated include, for example, preservatives (methyl parahydroxybenzoate, ethyl parahydroxybenzoate, butyl parahydroxybenzoate, phenoxyethanol, etc.); anti-inflammatory agents (for example, glycyrrhizic acid derivatives, glycyrrhetinic acid derivatives, thiotaurine, hypotaurine, 4-isopropyl cycloheptazone, zinc oxide, allantoin, etc.); whitening agents (for example, saxifrage extract, arbutin, tranexamic acid, L-ascorbic acid, magnesium L-ascorbyl phosphate, L -ascorbyl glucoside, potassium 4-methoxysalicylate, etc.); various extracts (for example, phellodendron amurense, coptis chinensis, lithospermum officinale root, peony root, Japanese angelica root, birch, sage, loquat, carrot, aloe vera, mallow, iris, grape, coix seed, loofah, lily, saffron, ligusticum chuanxiong, ginger, forsythia suspensa, red onion flower, garlic, chili pepper, tangerine peel, angelica, seaweed, etc.); activators (for example, royal jelly, photosensitizers, cholesterol derivatives, etc.); blood circulation promoters, etc.

[0097] The product form of the multilayered cosmetic of the present invention is not particularly limited, and examples thereof include cleansing cosmetics, makeup cosmetics such as foundation, primers, sunscreens, skin care cosmetics, body cosmetics, antiperspirant cosmetics, and hair cosmetics.

[0098] Example

[0099] The present invention will be further described in detail with reference to the following examples. The present invention is not limited in any way by the following examples. The amounts of the compounds are expressed as mass % unless otherwise specified.

[0100] The components listed in Tables 1 to 3 below were prepared by conventional methods to produce multilayer cosmetics. The details of the evaluation are as follows.

[0101] (Measurement of average emulsified particle size)

[0102] The diameters of 100 randomly selected emulsified particles in the emulsified layer of the cosmetic immediately after production were measured using a microscope, and the average value thereof was defined as the average emulsified particle size (average particle size).

[0103] (Expansion of emulsified particles: High temperature stability)

[0104] The emulsified particles in the emulsion layer of the cosmetic material stored at 45° C. for one month after production were measured using a microscope in the same manner as above to determine the average emulsified particle size, which was evaluated according to the following criteria.

[0105] A: The average particle size after storage at 45°C for one month does not change at all compared to the average particle size immediately after production.

[0106] B: The change in average particle size after storage at 45°C for one month compared to the average particle size immediately after production is greater than 0% and less than 150%

[0107] C: The change in average particle size after storage at 45°C for one month compared to the average particle size immediately after production is greater than 150%

[0108] (Expansion of emulsion particles: Freeze stability)

[0109] After production, the emulsion was stored at -20°C for 3 days and then returned to room temperature for thawing. The emulsified particles in the emulsion layer of the cosmetic were measured microscopically in the same manner as above to determine the average emulsified particle size and evaluated according to the following criteria.

[0110] A: The average particle size after freezing and thawing does not change at all compared to the average particle size immediately after production.

[0111] B: The change rate of the average particle size after freezing and thawing compared to the average particle size immediately after production is greater than 0% and less than 150%

[0112] C: The change in average particle size after freezing and thawing compared to the average particle size immediately after production is greater than 150%

[0113] (Appearance of the preparation)

[0114] The prepared cosmetics were shaken immediately after production, after being stored at 45°C for one month, and after being stored at -20°C for three days, and then allowed to stand for 8 hours, and evaluated according to the following criteria.

[0115] A: The upper layer is the emulsion layer and is cloudy, while the lower layer is the water layer and is transparent. The two layers are clearly separated.

[0116] C: The whole system is cloudy without becoming 2 layers

[0117]

[0118]

[0119]

[0120] As shown in Table 1, the multilayered cosmetics of Examples 1 and 2 (Example 2 is an example in which the amount of (A) nonionic surfactant in Example 1 is 10 times that of Example 1) exhibit rapid separation between the emulsion layer and the aqueous layer, and exhibit excellent high-temperature stability and freeze stability. On the other hand, Comparative Example 1 does not contain the (B) ionic surfactant, and Comparative Example 2 does not contain the (C) cellulose derivative. However, both exhibit poor separation between the emulsion layer and the aqueous layer, and in Comparative Example 1, swelling of the emulsion particles was observed during freeze-thaw. Comparative Example 3 contains the (A) nonionic surfactant, but the weighted average HLB is less than 8.5. In this case, although separation between the emulsion layer and the aqueous layer is rapid, swelling of the emulsion particles was observed during freeze-thaw. Comparative Example 4 incorporates polyethylene glycol instead of the (C) cellulose derivative. In this case, separation between the emulsion layer and the aqueous layer is poor, and swelling of the emulsion particles was observed during freeze-thaw.

[0121] Examples 3 to 10 in Table 2 are examples in which the HLB of the nonionic surfactant (A) was changed. However, compared with Comparative Example 3 in which the weighted average HLB was less than 8.5, the freezing stability was excellent.

[0122] Examples 11 and 12 in Table 3 are examples in which the type of (A) nonionic surfactant was changed, Examples 13 and 14 are examples in which (B) ionic surfactant was changed to an amphoteric surfactant, Example 15 is an example in which the amount of (B) ionic surfactant (sodium stearoyl methyl taurate) was increased, and Examples 16 and 17 are examples in which an alcohol was added to reduce emulsion stability. However, in all examples, the separation between the emulsion layer and the aqueous layer was rapid, and high-temperature stability and freeze-drying stability were excellent. Furthermore, although not described in the table, in Example 1, when the sodium carboxymethylcellulose component (C) was changed to hydroxypropyl methylcellulose, separation into two layers was also observed immediately after production, and the two layers were clearly separated.

Claims

1. A multilayer cosmetic comprising an emulsion layer and an aqueous layer, comprising: (A) one or more nonionic surfactants having a weighted average HLB value of 8.5 or greater; (B) an ionic surfactant; (C) one or more cellulose derivatives selected from alkyl celluloses and hydroxyalkyl celluloses; (D) an oily component; and (E) Water, Furthermore, the (A) nonionic surfactant comprises POE-glycerol fatty acid ester, or POE-castor oil / POE-hardened castor oil derivative, The (B) ionic surfactant comprises higher fatty acid amide sulfonate or alkyl betaine, The mass ratio of the (B) ionic surfactant to the (A) nonionic surfactant is 0.05 to 2.

5.

2. multi-layer cosmetic according to claim 1, described POE-glycerol fatty acid ester comprises any one or more of PEG-20 glyceryl isostearate, PEG-5 glyceryl stearate, PEG-6 distearate and PEG-12 diisostearate, and / or The POE-castor oil / POE-hardened castor oil derivative includes PEG-10 hydrogenated castor oil.

3. The multi-layered cosmetic according to claim 1, wherein the higher fatty acid amide sulfonate comprises sodium stearoyl methyl taurate, and / or The alkyl betaine comprises lauryl betaine. 4 . The multi-layered cosmetic according to claim 1 , comprising 0.01 to 1% by mass of the (A) nonionic surfactant based on the total amount of the cosmetic. The multi-layered cosmetic according to any one of claims 1 to 3, comprising 0.005 to 0.5% by mass of the (B) ionic surfactant based on the total amount of the cosmetic. 6 . The multi-layered cosmetic according to claim 1 , comprising 10% by mass or more of the oily component (D) based on the total amount of the cosmetic.

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