Two-layer separation type composition

Abstract

To provide a composition which is an oil-and-water two-layer separation type composition which is converted into an emulsified state by shaking and not only is clearly separated into oil and water after the lapse of a given time but also can satisfactorily remove the mixed dirt in pores.SOLUTION: There is provided a two-layer separation type composition which comprises the following components (A), (B), (C) and (D), wherein the pH of the aqueous layer at 25°C is 8.6 or more and 12.5 or less: (A) a non-ester oil which is liquid state at 25°C, (B) an alkyl or alkenyl glyceryl ether or an alkyl or alkenyl polyglyceryl ether, which has one or a plurality of linear or branched alkyl or alkenyl groups having 8 to 22 carbon atoms and one or more hydroxy groups, (C) a non-ester surfactant having an HLB of 8 or more and (D) water.SELECTED DRAWING: None

Description

[Technical Field]

[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. [Background technology]

[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-layer separation compositions have been developed in which the oil and water layers separate when left to stand. These two-layer separation compositions must be emulsified by shaking during use, and must also clearly separate into oil and water after a certain period of time. As such oil-water two-layer separation compositions, a two-layer 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 silicone oil (Patent Document 1), and a two-layer separation composition containing 0.06 mass% to 1.8 mass% of a polyol derivative (Patent Document 2) have been reported. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Patent No. 6486918 [Patent Document 2] International Publication No. 2020 / 110608 Summary of the Invention [Problem to be solved by the invention]

[0005] 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 comedo sebum, and that such stains in the pores cannot be adequately removed with conventional makeup removal cosmetics. Therefore, an object of the present invention is to provide a composition that is an oil-water two-layer 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 effectively cleanses dirt in pores. [Means for solving the problem]

[0006] Therefore, the present inventors prepared a two-layer separation type composition by blending various ingredients, and using this composition, they investigated not only the ease of emulsification and oil-water separation ability after emulsification, but also the cleaning effect on mixed stains of foundation and comedic sebum in pores. As a result, they found that a two-layer separation type composition 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 with an HLB of 8 or more, and (D) water, and adjusting the pH of the water layer at 25°C to 8.6 or more and 12.5 or less, thereby obtaining a composition that is excellent in the ease of emulsification, oil-water separation ability, and cleaning effect on stains in pores, and completed the present invention.

[0007] That is, the present invention provides 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 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) Non-ester surfactants with an HLB of 8 or higher, (D) Water. [Effects of the Invention]

[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 comedic sebum present in the pores. DETAILED DESCRIPTION OF THE INVENTION

[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. One embodiment of the present invention is a two-phase separation type composition that contains the following components (A), (B), (C), and (D), and 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 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) Non-ester surfactants with an HLB of 8 or higher, (D) Water.

[0010] Component (A) of the present invention is preferably a non-ester-based oil that is liquid at 25°C from the viewpoint of oil-water separability and oil-water separability after storage. The non-ester oil that is liquid at 25° C. is preferably one or more selected from hydrocarbon oils, ether oils, silicone oils, and higher alcohols. 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 is more preferred. Being liquid at 25°C means having fluidity at 25°C. Among these, from the viewpoint of oil-water separation, those having a viscosity of 18 mPa·s or less at 25°C are more preferable. 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. Furthermore, 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 value 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, it is preferable that at least one of the glyceryl or polyglyceryl groups is a hydroxy group from the viewpoint of the effect of cleaning dirt in pores. 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, with isodecyl glyceryl ether being more preferred.

[0017] The content of component (B) in the two-layer separation 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 viewpoints of good oil-water mixing time and cleansing effect on dirt in pores. Also, from the viewpoints of oil-water separability and cleansing effect on 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, even 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 viewpoints of good oil-water mixing time and cleansing effect on dirt in pores.

[0018] From the viewpoint of oil-water separation, the mass ratio (B / A) of component (B) to component (A) in the two-phase 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 the cleaning effect of dirt in pores, 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 same viewpoint, it is preferably 0.0007 or more, and more preferably 0.0008 or more. Furthermore, the mass ratio (B / A) of the components (B) to (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 a good oil-water mixing time. The mass ratio (B / A) of component (B) to component (A) is 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 viewpoint of oil-water separation properties and good oil-water mixing time, the component (C) of the present invention is preferably a non-ester surfactant having an HLB of 8 or more. As component (C), from the viewpoint of oil-water separation property and good oil-water mixing time, one or more surfactants selected from nonionic surfactants, anionic surfactants and amphoteric surfactants having an HLB of 8 to 18 are preferred. The HLB of the nonionic surfactant of component (C) is preferably 8 or more, and from the viewpoint of oil-water separation ability 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 with an HLB of 8 to 18 include (C8-C20) alkyl polyglucosides (decyl glucoside, lauryl glucoside), polyoxyethylene lauryl ether (laureth-3, laureth-4, laureth-6), polyoxyethylene alkyl ethers such as polyoxyethylene oleyl ether, polyoxyethylene stearyl ether, polyoxyethylene behenyl ether, polyoxyethylene-2-octyldodecyl ether, and polyoxyethylene cholestanol ether; polyoxyethylene polyoxypropylene cetyl ether; and polyoxyethylene polyethylene propylene glycol ether. 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, sodium POE-lauryl 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 sulfosuccinate, etc.). sodium salts, etc.); alkylbenzenesulfonates (e.g., sodium linear dodecylbenzenesulfonate, triethanolamine linear dodecylbenzenesulfonate, linear dodecylbenzenesulfonic acid, etc.); higher fatty acid ester sulfate salts (e.g., sodium hydrogenated coconut oil fatty acid glycerin sulfate, etc.); N-acylglutamates (e.g., monosodium N-lauroylglutamate (a component also known as sodium lauroylglutamate), disodium N-stearoylglutamate, monosodium N-myristoyl-L-glutamate, etc.); sulfated oils (e.g., 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. Furthermore, 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 viewpoints 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 mass ratio (B / C) of the components (B) and (C) contained in the two-phase 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 effect of cleaning dirt in pores. From the viewpoint of a good oil-water mixing time, when C is 0.004 mass% or less, 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. From the same viewpoint, when C is more than 0.004 mass%, the content mass ratio is preferably 25 or less, more preferably 8 or less. The content mass ratio (B / C) of component (B) to component (C) is preferably 0.30 or more, more preferably 0.92 or more, and is preferably 750 or less, more preferably 45 or less, overall.

[0025] Component (D) of the present invention is water. As the water, natural water, tap water, ion-exchanged water, pure water, etc. can be used. The content of component (D) in the two-layer 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 to 12.5 inclusive, more preferably 8.7 to 12.0 inclusive, and even more preferably 9.0 to 11.5 inclusive, from the viewpoint of improving the ability to cleanse dirt in pores. The pH of the aqueous layer can be adjusted to the above range by adding a basic compound. However, in order to stably obtain the effects of the present invention, it is preferable to add one or more compounds selected from an amine compound, an inorganic base, and a water-soluble salt, 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 water-soluble salts (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 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 type composition of the present invention falls within the above range. The mass ratio (B / E) of the components (B) and (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 a good oil-water mixing time. The content mass ratio (B / E) of component (B) to component (E) is preferably 0.30 or less, more preferably 0.0020 or less, from the viewpoint of the effect of cleaning dirt in pores. The content mass ratio (B / E) of component (B) to component (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 components, the two-layer separation composition of the present invention may contain, within the scope of the present invention, oils other than component (A) (particularly skin care ingredients such as vegetable oils), moisturizers such as polyols, UV 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 separated composition of the present invention can be produced by mixing the above components. The obtained two-layer separation type composition of the present invention is a composition that easily becomes emulsified when shaken, and when left to stand, the oil layer and the aqueous layer are separated. Here, by shaking a certain number of times, the composition is emulsified for a sufficient time to be applied to the skin, and the composition can be easily applied to the skin.The sufficient time to apply the composition to the skin is 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, the state in which the oil layer and the water layer are separated in a static state means a state in which the oil layer and the water layer are clearly separated. In this specification, the state in which the boundary between the oil layer and the water layer is clear in a static state is referred to as having good oil-water separability.

[0032] When the two-layer separate composition of the present invention is used to cleanse the skin, dirt present on the skin, such as makeup stains, can be cleaned. 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 comedo sebum present in the pores. Furthermore, comedo 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 comedo sebum. Therefore, the two-layer separated 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 and 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-layer separation type composition comprising the following components (A), (B), (C), and (D), wherein 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 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) Non-ester surfactants with an HLB of 8 or higher, (D)Water <2> The aqueous layer contains the amine compound (E). <1> The two-layer separated composition described above. <3> The aqueous layer contains a water-soluble salt (F). <1> or <2> The two-layer separated composition described above. <4> Component (A) is one or more selected from hydrocarbon oils, higher alcohols, ether oils, and silicone oils that are liquid at 25°C. <1> ~ <3> The two-layer separated composition according to any one of the preceding claims. <5> Component (A) is one or more selected from the group consisting of branched alkanes having 8 to 18 carbon atoms and silicone oils. <1> ~ <4> The two-layer separated composition according to any one of the preceding claims. <6> 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. <1> ~ <5> The two-layer separated composition according to any one of the preceding claims. <7> Component (B) is an alkyl or alkenyl glyceryl ether having one or more linear or branched alkyl or alkenyl groups having 8 to 22 carbon atoms and one or more hydroxy groups. <1> ~ <6> The two-layer separated composition according to any one of the preceding claims. <8> Component (B) is a monoalkyl or monoalkenyl glyceryl ether having one linear or branched alkyl or alkenyl group having 8 to 22 carbon atoms. <1> ~ <7> The two-layer separated composition according to any one of the preceding claims. <9> 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, and even more preferably 0.05% by mass or more and 0.09% by mass or less. <1> ~ <8> The two-layer separated composition according to any one of the preceding claims. <10> Component (C) is one or more surfactants selected from nonionic surfactants, anionic surfactants, and amphoteric surfactants having an HLB of 8 or more. <1> ~ <9> The two-layer separated composition according to any one of the preceding claims. <11> Component (C) is at least one 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, all of which have an HLB of 8 to 18. <1> ~ <10> The two-layer separated composition according to any one of the preceding claims. <12> 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. <1> ~ <11> The two-layer separated composition according to any one of the preceding claims. <13> The pH of the aqueous layer at 25°C is preferably 8.7 or more and 12.0 or less, more preferably 9.0 or more and 11.5 or less. <1> ~ <12> The two-layer separated composition according to any one of the preceding claims. <14> The amine compound is at least one selected from the group consisting of amino alcohols, linear or cyclic aliphatic amines, and basic amino acids. <2> ~ <13> The two-layer separated composition according to any one of the preceding claims. <15> 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. <2> ~ <14> The two-layer separated composition according to any one of the preceding claims. <16> 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, and arginine. <2> ~ <15> The two-layer separated composition according to any one of the preceding claims. <17> The water-soluble salt is an inorganic salt of a strong base and a weak acid. <3> ~ <16> The two-layer separated composition according to any one of the preceding claims. <18> 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. <3> ~ <17> The two-layer separated composition according to any one of the preceding claims. <19> The mass ratio (B / C) of the components (B) and (C) is preferably 0.3 or more and 750 or less, and more preferably 0.92 or more and 75 or less. <1> ~ <18> The two-layer separated composition according to any one of the preceding claims. <20> It is a skin cosmetic. <1> ~ <19> The two-layer separated composition according to any one of the preceding claims. <21> A skin cleansing composition, <1> ~ <20> The two-layer separated composition according to any one of the preceding claims. [Example]

[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 Two-layer separation compositions were produced by mixing the components shown in Tables 1 to 10 and adjusting the pH to the values ​​shown in these tables. It was confirmed that the oil layer and the aqueous layer of the obtained composition were clearly separated when in a static state. The resulting 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. Table 11 shows the ingredients used in the tests.

[0037] [1] Measurement of pH of the 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 it maintained an emulsified state was measured. An emulsified state of 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) it maintained an emulsified state 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 approximately 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: Furthermore, for the compositions shown in Table 3, oil-water separation properties were checked after one week of storage at 60°C. Score 1: White interface Score 2: Half of the interface is white Score 3: White around the interface Score 4: The interface is slightly white Score 5: Uniformly transparent interface

[0040] [4] Evaluation of the cleaning effect of dirt in pores 10 mg of the model comedo sebum listed in Table 11 was applied to artificial skin with pores (regular white S2923, Okamoto Chemical Co., Ltd.), and one hour later, 8 mg of waterproof foundation (REVLON COLORSTAY 24hrs wear MOKA) was applied. Two hours later, 0.1 g of the test composition was applied, massaged 20 times, and rinsed with tap water. The presence or absence of foundation or 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 every pore of 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: Staining around almost every hole in the artificial skin Score 3.5: Dirt remains around some holes in the artificial skin Score 4: Slight staining around almost every hole in the artificial skin Score 4.5: Slight staining around some holes in the artificial skin Score 5: No stains left

[0041] [Table 1]

[0042] [Table 2]

[0043] [Table 3]

[0044] [Table 4]

[0045] [Table 5]

[0046] [Table 6]

[0047] [Table 7]

[0048] [Table 8]

[0049] [Table 9]

[0050] [Table 10]

[0051] [Table 11]

[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 alkyl or alkenyl polyglyceryl ether as component (B) containing one or more linear or branched alkyl or alkenyl groups having 8 to 22 carbon atoms and one or more hydroxyl groups 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

1. A two-layer separation type composition comprising the following components (A), (B), (C) and (D), wherein 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 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 having one or more hydroxy groups; (C) a non-ester surfactant having an HLB of 8 or more, (D) Water

2. 2. The two-layer separation type composition according to claim 1, wherein the aqueous layer contains an amine compound.

3. 3. The two-layer separation type composition according to claim 1, wherein the aqueous layer contains a water-soluble salt.

4. 3. The two-layer separation type composition according to claim 1, wherein component (A) is at least one oil selected from the group consisting of hydrocarbon oils, higher alcohols, ether oils and silicone oils, all of which have a viscosity of 18 mPa·s or less at 25°C.

5. 3. The two-layer separation type composition according to claim 1, wherein the component (C) is at least one surfactant selected from the group consisting of nonionic surfactants, anionic surfactants and amphoteric surfactants each having an HLB of 8 or more and 18 or less.

6. The two-layer separation type composition according to claim 1 or 2, wherein the content of component (A) is 6% by mass or more and 50% by mass or less, the content of component (B) is 0.015% by mass or more and 2% by mass or less, and the content of component (C) is 0.001% by mass or more and 0.5% by mass or less.

7. 3. The two-layer separation type composition according to claim 2, wherein the amine compound is at least one selected from the group consisting of amino alcohols, linear or cyclic aliphatic amines and basic amino acids.

8. The two-layer separation type composition according to claim 2, wherein the amine compound is at least one selected from the 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, methylamine, ethylamine, trimethylamine, triethylamine, ethylenediamine, tetramethylethylenediamine, hexamethylenediamine, diethylenetriamine, triethylenetetramine, tetraethylenepentamine, pentaethylenehexamine, morpholine, arginine and lysine.

9. 3. The two-layer separation type composition according to claim 2, wherein the amine compound is at least one selected from the 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. 4. The two-layer separation type composition according to claim 3, wherein the water-soluble salt is an inorganic salt of a strong base and a weak acid.

11. 3. The two-layer separated composition according to claim 1 or 2, which is a skin cosmetic.

12. 3. The two-layer separated composition according to claim 1 or 2, which is a skin cleansing composition.

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