Two-layer separation type elements

Abstract

DEPCT6910 / 03 / 2569 This invention relates to a two-stage oil-water separation element. This will become emulsified by shaking, and will not simply separate into oil and water. Clearly, even after the allotted time has elapsed, the mixed stains can still be removed. It also satisfactorily cleanses the skin's pores; this invention involves a type of component. A two-layer separation consisting of the following components (A), (B), (C), and (D), where pH The aqueous content at 25 degrees Celsius is 8.6 or higher and 12.5 or lower: (A) Non-esterified oil substances which (B) Alkyl or alkenyl glyceryl ether or alkyl or alkenyl poly Glyceryl ether containing one or more alkyl or alkenyl groups, straight or branched chains with 8 carbon atoms. or more and 22 or less, and containing one or more hydroxyl groups, (C) non-surfactants Esters with an HLB of 8 or more, and (D) water;

Description

Two-layer separated composition

[0001] The present invention relates to a two-layer separation type composition in which an oil layer and an aqueous layer are separated when left to stand.

[0002]

[0003] Makeup removal cosmetics are known to be in the form of aqueous, oily, and emulsion types. Of these, emulsion types are considered to be good in terms of achieving both makeup removal effect and a pleasant feel when used. However, emulsion types contain emulsifiers and thickeners to stabilize the emulsion system, which can cause stickiness.

[0003] Therefore, two-phase separation compositions have been developed in which an oil layer and an aqueous layer are separated when left to stand. These two-phase separation compositions must be emulsified by shaking during use, and must also clearly separate into an oil-water phase after a certain period of time has elapsed. As such oil-water two-phase separation compositions, a two-phase separation composition containing a surfactant selected from a sugar fatty acid ester and an alkyl polyglycoside having an HLB of less than 8, a branched alkane having 8 to 18 carbon atoms, and 0 to 4 mass% of a silicone oil (Patent Document 1), and a two-phase separation composition containing 0.06 mass% to 1.8 mass% of a polyol derivative (Patent Document 2) have been reported.

[0004] (Patent Document 1) Japanese Patent No. 6486918 (Patent Document 2) International Publication No. 2020 / 110608

[0005] The present invention provides a two-layer separation composition containing the following components (A), (B), (C), and (D), wherein the pH of the aqueous layer at 25°C is 8.6 to 12.5: (A) a non-ester oil that is liquid at 25°C, (B) an alkyl or alkenyl glyceryl ether or alkyl or alkenyl polyglyceryl ether having one or more linear or branched alkyl or alkenyl groups having from 8 to 22 carbon atoms and one or more hydroxy groups, (C) a non-ester surfactant having an HLB of 8 or higher, and (D) water. Detailed Description of the Invention

[0006] It has been found that makeup stains such as foundation are not only present on the surface of the skin and in the skin grooves, but also in the pores, and that the stains in the pores are often a mixture of makeup cosmetics such as foundation and comedic sebum, and that such stains in the pores cannot be adequately removed with conventional makeup remover cosmetics. Therefore, the present invention relates to providing an oil-water two-phase separation type composition that is easily emulsified by shaking, and that not only clearly separates oil and water after a certain period of time but also can effectively cleanse stains in the pores.

[0007] The present inventors prepared a two-layer separation type composition by blending various ingredients, and used the composition to examine not only the ease of emulsification and oil-water separability after emulsification, but also the cleansing effect on mixed stains of foundation and comedic sebum in pores. As a result, they found that a composition excellent in the ease of emulsification, oil-water separability, and cleansing effect on stains in pores can be obtained by using (A) a non-ester oil that is liquid at 25°C, (B) an alkyl or alkenyl glyceryl ether or alkyl or alkenyl polyglyceryl ether having a specific structure, (C) a non-ester surfactant having an HLB of 8 or more, and (D) water to form a two-layer separation type composition, and adjusting the pH of the water layer at 25°C to 8.6 or more and 12.5 or less.

[0008] The two-layer separation type composition of the present invention is easily emulsified by shaking during use, and after a certain period of time, separates into an oil-water state, and is capable of effectively cleansing not only makeup stains present on the surface of the skin and in the skin grooves, but also mixed stains of makeup cosmetics and comedo sebum present in the pores.

[0009] The present invention relates to a two-phase separation type composition that is easily emulsified by shaking and that separates into an oil layer and an aqueous layer when left to stand, and one embodiment of the composition is a two-phase separation type composition containing the following components (A), (B), (C), and (D), in which the pH of the aqueous layer at 25°C is 8.6 or more and 12.5 or less: (A) a non-ester oil that is liquid at 25°C, (B) an alkyl or alkenyl glyceryl ether or alkyl or alkenyl polyglyceryl ether having one or more linear or branched alkyl or alkenyl groups having from 8 to 22 carbon atoms and having one or more hydroxy groups, (C) a non-ester surfactant having an HLB of 8 or more, and (D) water.

[0010] Component (A) of the present invention is preferably a non-ester oil that is liquid at 25°C, from the viewpoint of oil-water separability and oil-water separability after storage. As a non-ester oil that is liquid at 25°C, one or more selected from hydrocarbon oils, ether oils, silicone oils, and higher alcohols are preferred. Of these, from the viewpoint of the cleaning effect on dirt in pores, one or more selected from hydrocarbon oils, ether oils, and silicone oils are more preferred. Being liquid at 25°C means having fluidity at 25°C. Of these, from the viewpoint of oil-water separability, one having a viscosity of 18 mPa s or less at 25°C is more preferred. The viscosity here is measured at 25°C using a B-type viscometer (for example, Model TVB-10, manufactured by Toki Sangyo Co., Ltd., measurement conditions: rotor No. 1, 60 rpm, 1 minute).

[0011] Examples of the hydrocarbon oil include liquid paraffin, squalane, liquid light isoparaffin, n-octane, n-heptane, cyclohexane, isododecane, and mineral oil. From the viewpoint of the cleaning effect of dirt in pores, branched alkanes having from 8 to 22 carbon atoms are preferred, and branched alkanes having from 8 to 18 carbon atoms are more preferred.

[0012] Examples of the ether oil include cetyl dimethyl butyl, dicaprylyl ether, dilauryl ether, and diisostearyl ether.

[0013] The higher alcohol may be a liquid higher alcohol having 12 to 20 carbon atoms, preferably a branched or unsaturated higher alcohol, and specific examples thereof include isostearyl alcohol, oleyl alcohol, and octyldodecanol.

[0014] Examples of the silicone oil include dimethylpolysiloxane (dimethicone), dimethylcyclopolysiloxane, methylphenylpolysiloxane, methylhydrogenpolysiloxane, and higher alcohol-modified organopolysiloxane. From the viewpoint of the effect of cleaning pore dirt, it is preferable that the silicone oil contains at least dimethylpolysiloxane (dimethicone).

[0015] The content of component (A) in the two-layer separation composition is preferably 6% by mass or more, more preferably 7% by mass or more, even more preferably 14% by mass or more, even more preferably 20% by mass or more, and preferably 43% by mass or less, from the viewpoint of cleansing dirt in pores. Also, from the viewpoint of emulsifying the composition for a sufficient time to apply it to the skin with a certain number of shakings (hereinafter referred to as the viewpoint of good oil-water mixing time), it is preferably 50% by mass or less, more preferably 34% by mass or less. More specifically, from the viewpoint of cleansing dirt in pores and good oil-water mixing time, the content of component (A) is preferably 6% by mass or more and 50% by mass or less, more preferably 7% by mass or more and 50% by mass or less, even more preferably 14% by mass or more and 43% by mass or less, and even more preferably 20% by mass or more and 34% by mass or less.

[0016] From the viewpoint of oil-water separability, component (B) of the present invention is preferably an alkyl or alkenyl glyceryl ether or an alkyl or alkenyl polyglyceryl ether having one or more linear or branched alkyl or alkenyl groups having from 8 to 22 carbon atoms and one or more hydroxy groups. The HLB of component (B) is preferably less than 8. Here, the HLB value is a value calculated by the Griffin method. Here, the alkyl or alkenyl group ether-bonded to the glyceryl group or polyglyceryl group is a linear or branched alkyl or alkenyl group having from 8 to 22 carbon atoms, and from the viewpoint of oil-water separability, a linear or branched alkyl or alkenyl group having from 8 to 18 carbon atoms is preferred. Furthermore, from the viewpoint of the effect of cleaning dirt in pores, it is preferred that at least one of the glyceryl or polyglyceryl groups is a hydroxy group. Furthermore, among the alkyl or alkenyl glyceryl ethers and alkyl or alkenyl polyglyceryl ethers, from the viewpoint of oil-water separability and the effect of cleaning dirt from pores, alkyl or alkenyl glyceryl ethers having one or more linear or branched alkyl or alkenyl groups having from 8 to 22 carbon atoms and having one or more hydroxy groups are preferred, monoalkyl or monoalkenyl glyceryl ethers having one linear or branched alkyl or alkenyl group having from 8 to 22 carbon atoms are more preferred, and from the viewpoint of oil-water separability, monoalkyl or monoalkenyl glyceryl ethers having one branched alkyl or alkenyl group having from 8 to 18 carbon atoms are even more preferred. Specifically, isostearyl glyceryl ether (isostearyl glyceryl), stearyl glyceryl ether, isodecyl glyceryl ether, ethylhexylglycerin, cetyl glyceryl ether, oleyl glyceryl ether (also known as selachyl alcohol), etc. are preferred, and isodecyl glyceryl ether is more preferred.

[0017] The content of component (B) in the two-layer separation type composition is preferably 0.015% by mass or more, more preferably 0.03% by mass or more, even more preferably 0.036% by mass or more, and even more preferably 0.05% by mass or more, from the viewpoint of good oil-water mixing time and cleaning ability of dirt in pores. Also, from the viewpoint of oil-water separability and cleaning effect of dirt in pores, it is preferably 2% by mass or less, more preferably 1.5% by mass or less, and even more preferably 0.09% by mass or less. More specifically, the content of component (B) is preferably 0.015% by mass or more and 2% by mass or less, more preferably 0.03% by mass or more and 1.5% by mass or less, more preferably 0.036% by mass or more and 2% by mass or less, even more preferably 0.036% by mass or more and 1.5% by mass or less, even more preferably 0.05% by mass or more and 0.09% by mass or less, from the viewpoint of good oil-water mixing time and cleaning ability of dirt in pores.

[0018] The content mass ratio (B / A) of component (B) to component (A) in the two-layer separation type composition is preferably 0.0065 or less, more preferably 0.0035 or less, even more preferably 0.0030 or less, and even more preferably 0.0027 or less, from the viewpoint of oil-water separation property. Also, the content mass ratio (B / A) of component (B) to component (A) is preferably 0.0065 or less, more preferably 0.0035 or less, even more preferably 0.0030 or less, even more preferably 0.0027 or less, and even more preferably 0.0015 or less, from the viewpoint of the cleaning effect of dirt in pores. Also, from the same viewpoint, it is preferably 0.0007 or more, and more preferably 0.0008 or more. Also, the content mass ratio (B / A) of component (B) to component (A) is preferably 0.0007 or more, more preferably 0.0013 or more, and even more preferably 0.0023 or more, from the viewpoint of good oil-water mixing time. The mass ratio (B / A) of the component (B) to the component (A) is, overall, preferably 0.0007 or more, more preferably 0.0008 or more, and is preferably 0.0065 or less, more preferably 0.0035 or less, even more preferably 0.0030 or less, and even more preferably 0.0027 or less.

[0019] From the viewpoints of oil-water separability and good oil-water mixing time, component (C) of the present invention is preferably a non-ester surfactant having an HLB of 8 or more. From the viewpoints of oil-water separability and good oil-water mixing time, component (C) is preferably one or more surfactants selected from nonionic surfactants, anionic surfactants, and amphoteric surfactants having an HLB of 8 to 18. The HLB of the nonionic surfactant of component (C) is preferably 8 or more, and from the viewpoints of oil-water separability and good oil-water mixing time, it is more preferably 8.5 or more, even more preferably 9 or more, and is preferably 18 or less.

[0020] Examples of nonionic surfactants having an HLB of 8 to 18 include polyoxyethylene alkyl ethers such as (C8-C20) alkyl polyglucosides (decyl glucoside, lauryl glucoside), polyoxyethylene lauryl ether (laureth-3, laureth-4, laureth-6), polyoxyethylene oleyl ether, polyoxyethylene stearyl ether, polyoxyethylene behenyl ether, polyoxyethylene-2-octyldodecyl ether, and polyoxyethylene cholestanol ether; polyoxyethylene polyoxypropylene cetyl ether, polyoxyethylene polyethylene propylene glycol ether, polyoxyethylene polyethylene glycol propylene ... Examples of suitable surfactants include polyoxyethylene polyoxypropylene alkyl ethers such as polyoxyethylene-2-decyltetradecyl ether, polyoxyethylene polyoxypropylene monobutyl ether, polyoxyethylene polyoxypropylene hydrogenated lanolin, and polyoxyethylene polyoxypropylene glycerin ether; pronic nonionic surfactants; tetrapolyoxyethylene tetrapolyoxypropylene-ethylenediamine condensates; and alkanolamides such as coconut oil fatty acid alkanolamide, lauric acid monoethanolamide, and fatty acid isopropanolamide. Among these, (C8-C20) alkyl polyglucoside nonionic surfactants with an HLB of 8 to 18 are preferred, with decyl glucoside and lauryl glucoside being more preferred.

[0021] Examples of anionic surfactants include higher fatty acid salts (e.g., sodium laurate, sodium palmitate, etc.); higher alkyl sulfate ester salts (e.g., sodium lauryl sulfate, potassium lauryl sulfate, etc.); alkyl ether sulfate ester salts (e.g., POE-lauryl triethanolamine sulfate, POE-lauryl sodium sulfate, etc.); N-acyl sarcosine salts (e.g., sodium lauroyl sarcosine, etc.); higher fatty acid amide sulfonates (e.g., sodium N-stearoyl-N-methyl taurate, sodium N-myristoyl-N-methyl taurate, sodium coconut oil fatty acid methyl taurate, sodium lauryl methyl taurate, etc.); phosphate ester salts (sodium POE-oleyl ether phosphate, POE-stearyl ether phosphate, etc.); sulfosuccinates (e.g., sodium di-2-ethylhexyl sulfosuccinate, sodium monolauroyl monoethanolamide polyoxyethylene sulfosuccinate, sodium lauryl polypropylene glycol ... sodium salts, etc.); alkylbenzenesulfonates (for example, sodium linear dodecylbenzenesulfonate, triethanolamine linear dodecylbenzenesulfonate, linear dodecylbenzenesulfonic acid, etc.); higher fatty acid ester sulfate salts (for example, sodium hydrogenated coconut oil fatty acid glycerin sulfate, etc.); N-acylglutamates (for example, monosodium N-lauroylglutamate (a component also known as sodium lauroylglutamate), disodium N-stearoylglutamate, monosodium N-myristoyl-L-glutamate, etc.); sulfated oils (for example, turmeric oil, etc.); POE-alkyl ether carboxylic acids; POE-alkyl allyl ether carboxylate salts; α-olefin sulfonates; higher fatty acid ester sulfonates; secondary alcohol sulfate salts; higher fatty acid alkylolamide sulfate salts; sodium lauroylmonoethanolamide succinate; ditriethanolamine N-palmitoyl aspartate; and sodium caseinate. Of these, N-acyl sarcosine salts, higher fatty acid amide sulfonates, sulfosuccinates, N-acyl glutamates (for example, sodium lauroyl glutamate), polyoxyethylene alkyl ether carboxylates, and the like are preferred.

[0022] Examples of amphoteric surfactants include imidazoline-type amphoteric surfactants (e.g., 2-undecyl-N,N,N-(hydroxyethylcarboxymethyl)-2-imidazoline sodium, 2-cocoyl-2-imidazolinium hydroxide-1-carboxyethyloxy disodium salt, etc.); betaine-type surfactants (e.g., 2-heptadecyl-N-carboxymethyl-N-hydroxyethylimidazolinium betaine, lauryldimethylaminoacetic acid betaine, alkyl betaine, amido betaine, sulfobetaine (sultaine), (laurylhydroxysultaine), etc.).

[0023] The content of component (C) in the two-phase separation composition is preferably 0.001% by mass or more, more preferably 0.002% by mass or more, and even more preferably 0.005% by mass or more, from the viewpoint of good oil-water mixing time. Also, from the viewpoint of oil-water separation, it is preferably 0.5% by mass or less, more preferably 0.3% by mass or less, and even more preferably 0.049% by mass or less. More specifically, from the viewpoint of oil-water separability and good oil-water mixing time, the content of component (C) is preferably 0.001% by mass or more and 0.5% by mass or less, more preferably 0.002% by mass or more and 0.3% by mass or less, and even more preferably 0.005% by mass or more and 0.049% by mass or less.

[0024] The content mass ratio (B / C) of component (B) to component (C) in the two-layer separation type composition is preferably 0.30 or more, more preferably 0.92 or more, from the viewpoint of oil-water separability. The content mass ratio (B / C) of component (B) to component (C) is preferably 750 or less, more preferably 45 or less, from the viewpoint of the cleaning effect of dirt in pores. From the viewpoint of a good oil-water mixing time, the content mass ratio (B / C) of component (B) to component (C) is preferably 4 or more, more preferably 5 or more, even more preferably 7 or more, even more preferably 13 or more, and particularly preferably 23 or more, when C is 0.004 mass% or less. Also, from the same viewpoint, when C is more than 0.004 mass%, it is preferably 25 or less, more preferably 8 or less. The content mass ratio (B / C) of component (B) to component (C) is, overall, preferably 0.30 or more, more preferably 0.92 or more, preferably 750 or less, more preferably 45 or less.

[0025] The component (D) of the present invention is water. Natural water, tap water, ion-exchanged water, pure water, etc. can be used as the water. The content of the component (D) in the two-phase separation composition is preferably 40% by mass or more and 93% by mass or less from the viewpoints of good oil-water mixing time, oil-water separation property, and usability.

[0026] The pH of the aqueous layer of the two-layer separation composition of the present invention at 25°C is preferably 8.6 or more and 12.5 or less, from the viewpoint of improving the ability to clean dirt in pores. A more preferred pH is 8.7 or more and 12.0 or less, and even more preferably 9.0 or more and 11.5 or less. To adjust the pH of the aqueous layer within the above range, a basic compound may be added. However, in order to stably obtain the effects of the present invention, it is preferable to add one or more selected from amine compounds, inorganic bases, and water-soluble salts, and it is more preferable to use an amine compound (E) and a water-soluble salt (F) in combination.

[0027] Examples of the amine compound (E) include amino alcohols such as 2-amino-2-hydroxymethyl-1,3-propanediol (a component also known as "tris(hydroxymethyl)aminomethane" or "tris" or "tromethamine")), 2-amino-2-methyl-1-propanol (a component also known simply as "AMP"), 2-amino-2-methyl-1,3-propanediol (a component also known simply as "AMPD"), monoethanolamine, and diethanolamine; linear or cyclic aliphatic amines such as methylamine, ethylamine, trimethylamine, triethylamine, ethylenediamine, tetramethylethylenediamine, hexamethylenediamine, diethylenetriamine, triethylenetetramine, tetraethylenepentamine, pentaethylenehexamine, and morpholine; and basic amino acids such as arginine and lysine. Among these, it is more preferable to use one or more selected from 2-amino-2-hydroxymethyl-1,3-propanediol, 2-amino-2-methyl-1-propanol, 2-amino-2-methyl-1,3-propanediol and arginine.

[0028] Examples of the water-soluble salt (F) include inorganic salts obtained from a strong base (potassium hydroxide, sodium hydroxide, lithium hydroxide, etc.) and a weak acid (carbonic acid, bicarbonate, acetic acid, phosphoric acid, citric acid, fatty acid, etc.), or inorganic salts obtained from a strong base and a strong acid (hydrochloric acid, sulfuric acid, etc.). Examples of inorganic salts obtained from a strong base and a weak acid include potassium dihydrogen phosphate (K phosphate), dipotassium hydrogen phosphate, disodium hydrogen phosphate (disodium phosphate), trisodium citrate, sodium bicarbonate, sodium acetate, lithium carbonate, sodium carbonate, potassium carbonate, potassium bicarbonate, potassium acetate, etc. Examples of inorganic salts obtained from a strong base and a strong acid include sodium chloride (Na chloride), potassium chloride, calcium chloride, magnesium chloride, sodium sulfate (Na sulfate), potassium sulfate, magnesium sulfate, calcium sulfate, etc.

[0029] These amine compounds and water-soluble salts may be contained in amounts such that the pH of the aqueous layer at 25°C of the two-phase separation composition of the present invention falls within the above-mentioned range. From the viewpoint of a good oil-water mixing time, the mass ratio (B / E) of components (B) to (E) in the two-phase separation composition is preferably 0.0030 or more, more preferably 0.0054 or more, and even more preferably 0.0090 or more. From the viewpoint of the cleaning effect of dirt in pores, the mass ratio (B / E) of components (B) to (E) is preferably 0.30 or less, and more preferably 0.0020 or less. Overall, the mass ratio (B / E) of components (B) to (E) is preferably 0.0030 or more, more preferably 0.0054 or more, and even more preferably 0.0090 or more, and is preferably 0.30 or less, and more preferably 0.0020 or less.

[0030] In addition to the above-mentioned components, the two-layer separation type composition of the present invention may contain, within the scope of not impairing the effects of the present invention, oils other than component (A) (particularly skin care ingredients such as vegetable oils), moisturizers such as polyols, ultraviolet absorbers, antioxidants, disinfectants, plant extracts (particularly skin care ingredients such as vegetable extracts), fragrances, pigments, etc. Vegetable oils including ester oils may be contained in an amount of 0.05% by mass or less.

[0031] The two-layer separation type composition of the present invention can be produced by mixing the above-mentioned components. The obtained two-layer separation type composition of the present invention is a composition that easily becomes emulsified by shaking and that remains in a state in which the oil layer and the aqueous layer are separated when left to stand. Here, a certain number of shakes results in the composition remaining in an emulsified state for a time sufficient for application to the skin, thereby providing good usability for applying the composition to the skin. The time sufficient for applying this composition to the skin is sufficient to be 15 seconds or more, preferably 25 seconds or more, and more preferably 40 seconds or more. In this specification, this time is referred to as the oil-water mixing time. Furthermore, a state in which the oil layer and the aqueous layer are separated when left to stand means a state in which the oil layer and the aqueous layer are clearly separated. In this specification, a state in which the boundary between the oil layer and the aqueous layer is clearly defined when left to stand is referred to as good oil-water separability.

[0032] Cleansing the skin with the two-layer separate composition of the present invention can cleanse dirt present on the skin, such as makeup stains. Here, dirt present on the skin includes not only makeup stains present on the surface of the skin or in the skin grooves, but also mixed dirt of makeup cosmetics and comedos sebum present in the pores. Furthermore, comedos sebum refers to sebum stains present in the pores. Needless to say, the two-layer separate composition of the present invention can cleanse both makeup stains in the pores and comedos sebum. Therefore, the two-layer separate composition of the present invention is useful as a skin cosmetic, and is particularly useful as a skin cleansing composition.

[0033] The two-layer separate composition of the present invention can be used to cleanse the skin by rinsing with water, or it can be used as a leave-on type that does not need to be rinsed off with water. In the case of a leave-on type, for example, the composition may be applied to the skin, massaged, and then wiped off with a fibrous material such as a pad, or the skin may be massaged with a fibrous material soaked in the composition.

[0034] In relation to the above-described embodiments, the present invention further discloses the following compositions, etc. <1> A two-phase separation composition containing the following components (A), (B), (C), and (D), wherein the pH of the aqueous layer at 25°C is 8.6 to 12.5: (A) a non-ester oil that is liquid at 25°C; (B) an alkyl or alkenyl glyceryl ether or an alkyl or alkenyl polyglyceryl ether having one or more linear or branched alkyl or alkenyl groups having from 8 to 22 carbon atoms and one or more hydroxy groups; (C) a non-ester surfactant having an HLB of 8 or higher; and (D) water. <2> The two-phase separation composition according to <1>, wherein the aqueous layer contains an amine compound (E). <3> The two-phase separation composition according to <1> or <2>, wherein the aqueous layer contains a water-soluble salt (F). <4> The two-layer separation type composition according to any one of <1> to <3>, wherein component (A) is one or more selected from hydrocarbon oils, higher alcohols, ether oils, and silicone oils, all of which are liquid at 25°C. <5> The two-layer separation type composition according to any one of <1> to <4>, wherein component (A) is one or more selected from branched alkanes having from 8 to 18 carbon atoms and silicone oils. <6> The two-layer separation type composition according to any one of <1> to <5>, wherein the content of component (A) is preferably from 6 to 50% by mass, more preferably from 7 to 50% by mass, even more preferably from 14 to 43% by mass, and still more preferably from 20 to 34% by mass. <7> The two-layer separation type composition according to any one of <1> to <6>, wherein component (B) is an alkyl or alkenyl glyceryl ether having one or more linear or branched alkyl or alkenyl groups having from 8 to 22 carbon atoms and one or more hydroxy groups. <8> The two-layer separation type composition according to any one of <1> to <7>, wherein component (B) is a monoalkyl or monoalkenyl glyceryl ether having one linear or branched alkyl or alkenyl group having from 8 to 22 carbon atoms. <9> The two-layer separation type composition according to any one of <1> to <8>, wherein the content of component (B) is preferably from 0.015% by mass to 2% by mass, more preferably from 0.03% by mass to 1.5% by mass, and even more preferably from 0.05% by mass to 0.09% by mass.<10> The two-layer separation composition according to any one of <1> to <9>, wherein component (C) is at least one surfactant selected from the group consisting of a nonionic surfactant, an anionic surfactant, and an amphoteric surfactant, each having an HLB of 8 or more. <11> The two-layer separation composition according to any one of <1> to <10>, wherein component (C) is at least one surfactant selected from the group consisting of decyl glucoside, lauryl glucoside, polyoxyethylene alkyl ether, polyoxyethylene polyoxypropylene alkyl ether, N-acyl sarcosine salt, higher fatty acid amide sulfonate, sulfosuccinate, N-acyl glutamate, polyoxyethylene alkyl ether carboxylate, imidazoline-type amphoteric surfactant, and betaine-type surfactant, each having an HLB of 8 to 18. <12> The two-phase separation composition according to any one of <1> to <11>, wherein the content of component (C) is preferably 0.001% by mass or more and 0.5% by mass or less, more preferably 0.002% by mass or more and 0.3% by mass or less, and even more preferably 0.005% by mass or more and 0.049% by mass or less. <13> The two-phase separation composition according to any one of <1> to <12>, wherein the pH of the aqueous layer at 25°C is preferably 8.7 to 12.0, more preferably 9.0 to 11.5. <14> The two-phase separation composition according to any one of <2> to <13>, wherein the amine compound is one or more selected from the group consisting of amino alcohols, linear or cyclic aliphatic amines, and basic amino acids. <15> The two-layer separation composition according to any one of <2> to <14>, wherein the amine compound is at least one selected from 2-amino-2-hydroxymethyl-1,3-propanediol, 2-amino-2-methyl-1-propanol, 2-amino-2-methyl-1,3-propanediol, monoethanolamine, diethanolamine, methylamine, ethylamine, trimethylamine, triethylamine, ethylenediamine, tetramethylethylenediamine, hexamethylenediamine, diethylenetriamine, triethylenetetramine, tetraethylenepentamine, pentaethylenehexamine, morpholine, arginine, and lysine.<16> The two-layer composition according to any one of <2> to <15>, wherein the amine compound is one or more selected from 2-amino-2-hydroxymethyl-1,3-propanediol, 2-amino-2-methyl-1-propanol, 2-amino-2-methyl-1,3-propanediol, and arginine. <17> The two-layer composition according to any one of <3> to <16>, wherein the water-soluble salt is an inorganic salt composed of a strong base and a weak acid. <18> The two-layer composition according to any one of <3> to <17>, wherein the water-soluble salt is one or more selected from potassium dihydrogen phosphate (K phosphate), dipotassium hydrogen phosphate, disodium hydrogen phosphate (disodium phosphate), trisodium citrate, sodium bicarbonate, sodium acetate, lithium carbonate, sodium carbonate, potassium carbonate, potassium bicarbonate, and potassium acetate. <19> The two-layer-separated composition according to any one of <1> to <18>, wherein the content mass ratio (B / C) of component (B) to component (C) is preferably 0.3 or more and 750 or less, more preferably 0.92 or more and 75 or less. <20> The two-layer-separated composition according to any one of <1> to <19>, which is a skin cosmetic. <21> The two-layer-separated composition according to any one of <1> to <20>, which is a skin cleansing composition.

[0035] The present invention will now be described in more detail with reference to examples, but the present invention is not limited to these examples.

[0036] Examples 1 to 43 and Comparative Examples 1 to 5 The components shown in Tables 1 to 10 were mixed, and the pH was adjusted to the values ​​shown in these tables to produce two-phase separation compositions. It was confirmed that the oil and water layers of the obtained compositions were clearly separated when in a static state. The obtained compositions were evaluated for oil-water mixing time, oil-water separation ability, and ability to clean dirt in pores. The results are shown in Tables 1 to 10. The components used in the tests are also shown in Table 11.

[0037] [1] Measurement of pH of aqueous layer The pH of the aqueous layer stock solution at 25° C. was measured with a pH meter (HORIBA LAQUA F-72).

[0038] [2] Evaluation of oil-water mixing time The composition was shaken by hand 10 times with a stroke of approximately 30 cm, and the time during which the emulsified state was maintained was measured. A time during which the emulsified state was maintained for 15 seconds or more was judged as good, 25 seconds or more as better, and 40 seconds or more as particularly good. The time (seconds) during which the emulsified state was maintained is shown in the table.

[0039] [3] Evaluation of oil-water separation The composition was emulsified by shaking it by hand 10 times with a stroke of about 30 cm, and after leaving it to stand for one day, the oil-water interface was checked with the naked eye and scored and evaluated as follows. In addition, for the compositions shown in Table 3, the oil-water separation property was checked after storing it at 60°C for one week. Score 1: The interface is white Score 2: Half of the interface is white Score 3: The periphery of the interface is white Score 4: The interface is slightly white Score 5: The interface is uniformly transparent

[0040] [4] Evaluation of Cleansing Effect on Dirt in Pores 10 mg of the model comedo sebum listed in Table 11 was applied to artificial skin having pores (Regular White S2923, Okamoto Chemical Co., Ltd.), and 1 hour later, 8 mg of waterproof foundation (REVLON COLORSTAY 24hrs wear MOKA) was applied. After 2 hours, 0.1 g of the test composition was applied, massaged 20 times, and rinsed with tap water. The presence or absence of foundation and dirt remaining in the pores and on the skin was observed under a microscope (KEYENCE VHX-5000, magnification 100x) and evaluated according to the following criteria. Score 1: Dirt remains in almost all holes in the artificial skin. Score 1.5: Dirt remains in more than half of the holes in the artificial skin. Score 2: Dirt remains in about half of the holes in the artificial skin. Score 2.5: Dirt remains in some holes in the artificial skin. Score 3: Dirt remains around almost all holes in the artificial skin. Score 3.5: Dirt remains around some holes in the artificial skin. Score 4: Slight dirt remains around almost all holes in the artificial skin. Score 4.5: Slight dirt remains around some holes in the artificial skin. Score 5: No dirt remains.

[0041]

[0042]

[0043]

[0044]

[0045]

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[0047]

[0048]

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[0050]

[0051]

[0052] Tables 1 and 2 show that adjusting the pH of the aqueous layer of the composition to 8.6 to 12.5 significantly improves the cleansing ability for pore-dense dirt. Tables 3 and 4 show that using a non-ester oil that is liquid at 25°C as the oil improves oil-water separability. Tables 5 and 6 show that using an alkyl or alkenyl glyceryl ether or an alkyl or alkenyl polyglyceryl ether having one or more linear or branched alkyl or alkenyl groups containing 8 to 22 carbon atoms and one or more hydroxy groups as component (B) improves oil-water separability and the cleansing ability for pore-dense dirt. Tables 7 and 8 show that using a non-ester surfactant with an HLB of 8 or higher as component (C) improves the oil-water mixing time, oil-water separability, and the cleansing ability for pore-dense dirt. Tables 9 and 10 show that using an amine compound and a water-soluble salt as pH adjusters improves the oil-water mixing time, oil-water separability, and the cleansing ability for pore-dense dirt.

Claims

DEPCT6910 / 03 / 25691. A two-layer separation composition consisting of the following components (A), (B), (C), and (D), where the pH of the aqueous layer at 25°C is 8.6 or higher and 12.5 or lower: (A) non-esterified oil substance in liquid state at 25°C, (B) alkyl or alkenyl glyceryl ether or alkyl or alkenyl polyglyceryl ether containing one or more alkyl or alkenyl chains. (C) non-esterified surfactants with 8 or more carbon atoms and 22 or fewer, and containing one or more hydroxyl groups, and (D) water.

2. Bifidation type compositions according to claim 1, where the aqueous layer contains amine compounds.

3. Bifidation type compositions according to claim 1 or 2, where the aqueous layer contains water-soluble salts. 4.A two-layer separation composition under any of Reputations 1 through 3, where component (A) is one or more members selected from a group consisting of hydrocarbon oils, high molecular weight alcohols, ether oils, and silicone oils with a viscosity of 18 millipascals•sec or less at 25°C.

5. A two-layer separation composition under any of Reputations 1 through 4, where component (C) is one or more members selected from a group consisting of surfactants. Nonionic surfactants, anionic surfactants, and cationic and anionic surfactants with an HLB of 8 or more and 18 or less.

6. Two-layer separation compositions according to any one of claims 1 through 5, where the composition of component (A) is 6% by mass or more and 50% by mass or less, the composition of component (B) is 0.015% by mass or more and 2% by mass or less, and the composition of component (C) is 0.001% by mass or more and 0.5% by mass or less.7.A bi-dissociation composition under one of claims 2 through 6, where the amine compound is one or more members selected from a group consisting of amino alcohols, chained or cyclic aliphatic amines, and basic amino acids.

8. A bi-dissociation composition under one of claims 2 through 7, where the amine compound is one or more members selected from a group consisting of 2-amino-2-hydroxymethyl-1,3-propanediol, 2-amino-2-methyl-1-propanol, 2-amino-2-methyl-1,3-propanediol, monoethanolamine, diethanolamine.

9. A two-layer separation type of compound according to one of the claims 2 through 8, where the amine compound is one or more members selected from a group consisting of 2-amino-2-hydroxymethyl-1,3-propanediol, 2-amino-2-methyl-1-propanol, 2-amino-2-methyl-1,3-propanediol, and arginine. 10.

11. A dual-dispersion composition under any one of claims 3 through 9, where the water-soluble salt is an inorganic salt composed of a strong base and a weak acid.

12. A dual-dispersion composition under any one of claims 1 through 11, where the dual-dispersion composition is a cosmetic for the skin.