Two-layer cleansing cosmetic

Abstract

To provide two-layer cleansing cosmetics that are capable of readily removing hard-to-remove makeup cosmetics, and do not cause stickiness or sliminess after its use.SOLUTION: Two-layer cleansing cosmetics contain following components (A), (B) and (C): (A) an oil solution that is liquid at 25°C, (B) a glycerol derivative represented by general formula (1) (where Gly is a residue after removing a hydroxy group from a glycerol, PO is an oxypropylene group, EO is an oxyethylene group, subscripts a and b each represent an average added mol number of PO and EO, which is 1-50, with the mass ratio of PO and EO (PO / EO) being 1 / 5-5 / 1, BO is a C4 oxyalkylene group, and c is an average added mol number of BO, which is 1-5) and (C) water.SELECTED DRAWING: None

Description

Technical Field

[0001] The present invention relates to a two-layer cleansing cosmetic.

Background Art

[0002] Conventionally, as cleansing cosmetics, two-layer cleansing cosmetics have been studied from an aesthetic point of view that they are attractive not only in terms of functions such as cleansing effects and usability, but also in appearance. A two-layer cosmetic is a cosmetic that is easily emulsified and mixed by shaking or stirring during use and easily re-separates when left standing. Such an emulsified cosmetic is required to maintain a uniform emulsified and dispersed state for a certain period of use and to completely separate into two layers in the same state as before use after use. For example, Patent Document 1 describes a two-layer cleansing cosmetic containing tripolyhydroxy fatty acid dipentaerythrityl, an oil component, and water, which is excellent in aesthetics, has a good makeup removal effect and usability, and has high safety. Patent Document 2 describes a two-layer cleansing cosmetic composed of a liquid aqueous layer containing benzalkonium chloride or N-coconut oil fatty acid acyl-L-arginine ethyl·DL-pyrrolidone carboxylate and a liquid oil layer, which is excellent in removing makeup dirt and sebum dirt, has no sticky feeling after washing, and has excellent usability.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Patent Document 2

Summary of the Invention

Problems to be Solved by the Invention

[0004] However, in recent years, makeup cosmetics containing film-forming agents and other ingredients that are difficult to remove have been developed, and conventional two-layer cleansing cosmetics have difficulty adequately removing them, posing a problem with their cleansing performance. In addition, two-layer cleansing cosmetics have the problem of leaving oily residue on the skin after use, resulting in sticky skin after wiping. [Means for solving the problem]

[0005] The inventors have discovered that by using a specific glycerin derivative, it is possible to obtain a two-layer cleansing cosmetic that has high cleansing power against stubborn makeup and leaves no stickiness or greasiness after use.

[0006] The present invention comprises the following components (A), (B), and (C): (A) Liquid oil at 25℃, (B) General formula (1):

[0007] [ka]

[0008] (In the formula, Gly represents the residue obtained by removing the hydroxyl group from glycerol, PO represents the oxypropylene group, EO represents the oxyethylene group, a and b are the average number of moles of PO and EO added, respectively, with values ​​ranging from 1 to 50, and the mass ratio of PO to EO (PO / EO) is between 1 / 5 and 5 / 1, BO represents the oxyalkylene group with 4 carbon atoms, and c is the average number of moles of BO added, with values ​​ranging from 1 to 5.) Glycerin derivatives represented by (C)Water This relates to a two-layer cleansing cosmetic containing [a specific ingredient]. [Effects of the Invention]

[0009] The two-layer cleansing cosmetic of the present invention has high cleansing power against stubborn makeup such as lipstick and eyeliner, leaves no stickiness or greasiness after use, and provides a moisturizing feeling to the skin. Furthermore, the speed at which the two layers separate after shaking is optimal, the interface between the two layers separates cleanly, and both separation properties and usability are excellent. [Modes for carrying out the invention]

[0010] The oil component (A) is liquid at 25°C. Here, "liquid" means that its viscosity at 25°C is 10,000 mPa·s or less. Viscosity is measured using a Type B viscometer (VISCOMETER TVB-10, manufactured by Toki Sangyo Co., Ltd.), rotor No. 4, 12 rpm, and 1 minute. Such liquid oils are not limited to those commonly used in cosmetics, and examples include hydrocarbon oils, ester oils, ether oils, silicone oils, and higher fatty acids. More specifically, examples of hydrocarbon oils include liquid paraffin, liquid isoparaffin, light isoparaffin, light liquid isoparaffin, squalane, and squalene. The hydrocarbon oil preferably contains one or more selected from liquid paraffin, liquid isoparaffin, light liquid isoparaffin, and squalane; more preferably contains one or more selected from liquid paraffin, liquid isoparaffin, and light liquid isoparaffin; and even more preferably contains one or more selected from liquid paraffin and light liquid isoparaffin.

[0011] Examples of ester oils include monoester oils, diester oils, triester oils, and tetraester oils. Examples of monoester oils include monoesters of aliphatic or aromatic monocarboxylic acids or dicarboxylic acids having 2 to 24 carbon atoms. Specific examples include cetyl 2-ethylhexanoate, cetyl octanoate, isononyl isononanoate, isotridecyl isononanoate, hexyl laurate, isopropyl myristate, octyldodecyl myristate, myristyl myristate, 2-hexyldecyl myristate, isopropyl palmitate, octyl palmitate, 2-hexyldecyl butyl palmitate, isocetyl stearate, isocetyl isostearate, decyl oleate, isodecyl benzoate, octyl methoxycinnamate, hexyldecyl dimethyloctanoate, cetyl lactate, myristyl lactate, lanolin acetate, 2-ethylhexyl succinate, 2-hexyldecyl adipate, and alkyl benzoates (C12-C15). The monoester oil preferably contains one or more selected from isononyl isononanoate, isotridecyl isononanoate, and octyldodecyl myristate, and more preferably contains one or more selected from isotridecyl isononanoate and octyldodecyl myristate.

[0012] Examples of diester oils include diesters of dicarboxylic acids having 3 to 18 carbon atoms, and di-fatty acid esters of polyhydric alcohols. Specific examples include propylene glycol dicaprylate, neopentyl glycol dicaprate, glycol distearate, propylene glycol diisostearate, glyceryl diisostearate, glyceryl monomyristate monoisostearate, glyceryl di2-heptylundecanoate, di2-ethylhexyl succinate, diisopropyl sebacate, diisostearyl malate, ethylene glycol di2-ethylhexanoate, diisobutyl adipate, di-2-heptylundecyl adipate, and di-2-ethylhexyl sebacate. The diester oil preferably contains one or more selected from propylene glycol dicaprylate and neopentyl glycol dicaprate, and more preferably contains neopentyl glycol dicaprate.

[0013] Examples of triester oils include tri-fatty acid esters of polyhydric alcohols with a valency of 3 or higher, specifically, glyceryl trimyristate, glyceryl triisopalmitate, glyceryl tri-2-heptylundecanoate, trimethylolpropane triethylhexanoate, trimethylolpropane trioctanoate, tri(caprylic / capric acid)glycerin, glyceryl trioleate, glyceryl tri-2-ethylhexanoate, glyceryl triisostearate, and also vegetable oils such as olive oil, jojoba oil, macadamia nut oil, meadowfoam oil, castor oil, safflower oil, sunflower oil, avocado oil, canola oil, apricot kernel oil, rice germ oil, and rice bran oil. The triester oil preferably contains one or more selected from tri(caprylic / capric acid) glycerin, tri-2-ethylhexanoate glycerin, and vegetable oil; more preferably contains one or more selected from tri(caprylic / capric acid) glycerin, tri-2-ethylhexanoate glycerin, olive oil, and jojoba oil; even more preferably contains one or more selected from tri(caprylic / capric acid) glycerin, tri-2-ethylhexanoate glycerin, and even more preferably contains tri-2-ethylhexanoate glycerin.

[0014] Examples of tetraester oils include tetra fatty acid esters of polyhydric alcohols with four or more valencies, specifically tetra(behenic acid / benzoic acid / ethylhexanoic acid) pentaerythritol, tetraethylhexanoate pentaerythritol, tetraoctanoate pentaerythritol, and tetra-2-ethylhexanoate pentaerythritol.

[0015] The ester oil preferably contains one or more selected from monoester oils, diester oils, and triester oils, more preferably contains one or more selected from monoester oils and diester oils, and even more preferably contains monoester oil.

[0016] Examples of the ether oil include dialkyl ethers, with preference given to dialkyl ethers having two alkyl groups each with 16 or fewer carbon atoms, and more preferably dialkyl ethers having two alkyl groups each with 8 or fewer carbon atoms. In the dialkyl ether, the two alkyl groups may be the same or different. More specifically, examples of the ether oil include, for example, dihexyl ether, dioctyl ether, cetyl-1,3-dimethylbutyl ether, dilauryl ether, and the like. Among these, from the viewpoint of improving the detergency against long-lasting makeup cosmetics, reducing the stickiness of the skin after use, and reducing the sliminess of the skin after use, cetyl-1,3-dimethylbutyl ether and dioctyl ether are preferred, and dioctyl ether is more preferred.

[0017] Examples of the silicone oil include volatile and non-volatile linear dimethylpolysiloxanes such as dimethylpolysiloxane (1 cs), dimethylpolysiloxane (1.5 cs), dimethylpolysiloxane (2 cs), dimethylpolysiloxane (6 cs); branched siloxanes such as methyltrimethicone, tris(trimethylsiloxy)methylsilane, tetrakis(trimethylsilyl)silane; cyclic dimethylsiloxanes such as octamethylcyclotetrasiloxane, decamethylcyclopentasiloxane, dodecamethylcyclohexasiloxane; methylphenylpolysiloxanes such as diphenylsiloxyphenyltrimethicone; and higher alcohol-modified organopolysiloxanes. The silicone oil preferably contains one or more selected from linear dimethylpolysiloxanes and branched siloxanes, more preferably contains one or more selected from volatile linear dimethylpolysiloxanes and branched siloxanes, even more preferably contains a branched siloxane, and even more preferably contains tris(trimethylsiloxy)methylsilane.

[0018] [[ID=I1]] Examples of the higher fatty acid include oleic acid, isostearic acid, undecylenic acid, and the like.

[0019] As for the oil component (A), from the viewpoint of improving cleansing power against difficult-to-remove makeup cosmetics, reducing stickiness on the skin after use, and reducing greasiness on the skin after use, it is preferable to include one or more selected from hydrocarbon oils, ester oils, ether oils, and silicone oils, more preferably to include one or more selected from hydrocarbon oils, ether oils, and silicone oils, even more preferably to include one or more selected from liquid paraffin, light liquid isoparaffin, ether oil, and branched siloxane, even more preferably to include ether oil, and especially preferably to include dioctyl ether.

[0020] Component (A) can be used alone or in combination of two or more types. From the viewpoint of improving cleansing power against stubborn makeup, reducing stickiness on the skin after use, reducing greasiness on the skin after use, and improving the moisturizing effect on the skin after use, the content is preferably 10 to 60% by mass of the total composition, more preferably 20 to 50% by mass, even more preferably 22 to 45% by mass, and still more preferably 23 to 33% by mass.

[0021] If component (A) contains ether oil, one or more types of ether oil can be used in combination. From the viewpoint of improving cleansing power against stubborn makeup, reducing stickiness on the skin after use, and reducing greasiness on the skin after use, the content is preferably 0.1 to 30% by mass of the total composition, more preferably 0.8 to 10% by mass, and even more preferably 1.8 to 3% by mass.

[0022] The glycerin derivative of component (B) used in the present invention is represented by the general formula (1) described above. The glycerol derivative of component (B) can be obtained, for example, by adding propylene oxide and ethylene oxide to glycerol in proportions of 3 to 150 molar equivalents each, and then adding a C4 alkylene oxide in proportions of 3 to 15 molar equivalents each. In other words, the glycerol derivative of general formula (1) can be obtained by first synthesizing an adduct of PO and EO, and then adding a C4 alkylene oxide in a block-like manner.

[0023] The mass ratio (PO / EO) of propylene oxide (PO) and ethylene oxide (EO) is 1 / 5 to 5 / 1, from the viewpoint of improving cleansing power against stubborn makeup, improving skin hydration after use, optimizing the speed at which the two layers separate after shaking, and ensuring clean separation of the two layers at the interface after shaking. The addition form of propylene oxide and ethylene oxide may be random or blocky. From the viewpoint of improving cleansing power against stubborn makeup, improving skin hydration after use, optimizing the speed at which the two layers separate after shaking, and ensuring clean separation of the two layers at the interface after shaking, it is preferable to add them in a random manner.

[0024] The average number of moles of propylene oxide (PO) and ethylene oxide (EO) added, a and b, are preferably between 1 and 50, and within the range of 1 to 10, from the viewpoint of improving cleansing power against stubborn makeup, improving skin hydration after use, optimizing the speed at which the two layers separate after shaking, and ensuring clean separation of the two layers at the interface after shaking.

[0025] The average number of moles of C4 alkylene oxide (BO) added, c, is preferably between 2 and 4, and between 1 and 5, from the viewpoint of improving cleansing power against stubborn makeup, improving skin hydration after use, optimizing the speed at which the two layers separate after shaking, and ensuring clean separation of the two-layer interface after shaking.

[0026] Examples of C4 alkylene oxides include 1,2-butylene oxide, 2,3-butylene oxide, and tetramethylene oxide (tetrahydrofuran). Among these, 1,2-butylene oxide is preferred due to its availability and ease of reaction control.

[0027] Typically, when adding these alkylene oxides to glycerin, the addition reaction is carried out using an alkaline catalyst, a correlation transfer catalyst, or a Lewis acid catalyst. Generally, it is preferable to use an alkaline catalyst such as potassium hydroxide.

[0028] Specifically, component (B) may include a mixture in which the average number of added moles of (EO) is 8, the average number of added moles of (PO) is 5, and the average number of added moles of (BO) is 3. Polyoxybutylene polyoxyethylene polyoxypropylene glyceryl ether (3BO)(8EO)(5PO) is preferred from the viewpoint of improving cleansing power against stubborn makeup, improving the moisturizing effect on the skin after use, optimizing the speed at which the two layers separate after shaking, and cleanly separating the interface between the two layers after shaking. Commercially available products such as Willbride S-753 (manufactured by NOF Corporation) can be used.

[0029] Component (B) can be used alone or in combination of two or more types, and from the viewpoint of improving cleansing power against stubborn makeup cosmetics, reducing stickiness on the skin after use, reducing greasiness on the skin after use, improving the moisturizing feeling of the skin after use, optimizing the speed at which the two layers separate after shaking, and cleanly separating the interface between the two layers after shaking, the content is preferably 0.1 to 12% by mass of the total composition, more preferably 1.5 to 5% by mass, and even more preferably 1.8 to 3% by mass.

[0030] In the present invention, the mass ratio (A) / (B) of component (A) to component (B) is preferably 1 to 40, more preferably 2 to 30, even more preferably 6 to 20, and still more preferably 11 to 16, from the viewpoint of improving cleansing power against hard-to-remove makeup, reducing stickiness on the skin after use, reducing greasiness on the skin after use, improving the moisturizing feeling on the skin after use, optimizing the speed at which the two layers separate after shaking, and cleanly separating the interface between the two layers after shaking.

[0031] In the present invention, when component (A) contains ether oil, the mass ratio of ether oil to component (B), (ether oil) / (B), is preferably 0.05 to 30, more preferably 0.1 to 15, even more preferably 0.3 to 5, and still more preferably 0.75 to 1.5, from the viewpoint of improving cleansing power against hard-to-remove makeup, reducing stickiness on the skin after use, reducing greasiness on the skin after use, improving the moisturizing effect on the skin after use, optimizing the speed at which the two layers separate after shaking, and cleanly separating the interface between the two layers after shaking.

[0032] In the present invention, the water content of component (C) is preferably 40 to 90% by mass, more preferably 50 to 80% by mass, and even more preferably 55 to 75% by mass, from the viewpoint of improving cleansing power against difficult-to-remove makeup cosmetics, reducing stickiness on the skin after use, reducing greasiness on the skin after use, and improving the moisturizing feeling of the skin after use.

[0033] The two-layer cleansing cosmetic of the present invention may further contain polyhydric alcohols other than component (D) (B), thereby improving the cleansing power against stubborn makeup, improving the moisturizing effect on the skin after use, optimizing the speed at which the two layers separate after shaking, and enabling clean separation of the interface between the two layers after shaking. A polyhydric alcohol is a compound that has two or more hydroxyl groups in its molecule, and any of those commonly used in cosmetics will suffice. Examples of dihydric alcohols include ethylene glycol, diethylene glycol, triethylene glycol, polyethylene glycol, propylene glycol, dipropylene glycol, tripropylene glycol, polypropylene glycol, 1,3-butylene glycol, and propanediol. Examples of trihydric alcohols include glycerin and trimethylolpropane. Examples of tetrahydric alcohols include diglycerin and erythritol. Examples of pentahydric or higher polyhydric alcohols include polyglycerins such as triglycerin; sugars and sugar alcohols such as glucose, maltose, maltodose, sucrose, xylitol, sorbitol, malbitol, polyoxyethylene methyl glucoside, polyoxyethylene ethyl glucoside, and polyoxyethylene propylene glucoside.

[0034] As for the polyhydric alcohol, it is preferable to include one or more selected from dihydric alcohols, more preferably one or more selected from propanediol, dipropylene glycol, and 1,3-butylene glycol, and even more preferably at least dipropylene glycol.

[0035] The polyhydric alcohol of component (D) can be used alone or in combination of two or more types. From the viewpoint of improving cleansing power against stubborn makeup, reducing stickiness on the skin after use, reducing greasiness on the skin after use, optimizing the speed at which the two layers separate after shaking, and cleanly separating the interface between the two layers after shaking, the content is preferably 0.1 to 30% by mass of the total composition, more preferably 2 to 20% by mass, even more preferably 5 to 12% by mass, and still more preferably 7 to 10% by mass.

[0036] In the present invention, the total content of components (B) and (D) is preferably 2 to 30% by mass, more preferably 4 to 19% by mass, even more preferably 6 to 16% by mass, and still more preferably 9.5 to 14% by mass, from the viewpoint of improving cleansing power against stubborn makeup, reducing stickiness on the skin after use, reducing greasiness on the skin after use, improving the moisturizing feeling on the skin after use, optimizing the speed at which the two layers separate after shaking, and cleanly separating the interface between the two layers after shaking.

[0037] The two-layer cleansing cosmetic of the present invention may contain, in addition to the above-mentioned components, components commonly used in cosmetics, such as oily components other than component (A), chelating agents, moisturizers other than components (B) and (D), whitening agents, blood circulation promoters, anti-inflammatory agents, bactericides, UV absorbers, texture enhancers, colorants, preservatives, antioxidants, fragrances, plant and animal extracts, etc.

[0038] The two-layer cleansing cosmetic composition of the present invention achieves a uniform dispersion state by shaking, even without containing surfactants, and then a stable two-layer separation state is formed by standing. Therefore, it is preferable that the two-layer cleansing cosmetic composition of the present invention substantially contains no surfactants. "Substantially free of surfactants" means that the amount of surfactant is 0.01% by mass or less. Furthermore, by not containing surfactants, it reduces stickiness on the skin after use, optimizes the speed at which the product separates into two layers after shaking, and allows for clean separation of the two-layer interface after shaking.

[0039] In the present invention, if the time it takes for the two-layer cleansing cosmetic to separate into two layers after shaking is too short, the oil phase and aqueous phase become uneven when the two-layer cleansing cosmetic is taken out of the container and used, resulting in usability problems. If the time is too long, the two layers do not separate cleanly, which is undesirable from an aesthetic standpoint. Therefore, the time it takes for the two-layer cleansing cosmetic composition of the present invention to separate into two layers after shaking is preferably longer than 30 seconds, more preferably 35 seconds or more, and even more preferably 40 seconds or more. Furthermore, it is preferably less than 300 seconds, more preferably less than 180 seconds, even more preferably less than 120 seconds, even more preferably less than 60 seconds, and especially preferably less than 50 seconds. Furthermore, in the two-layer cleansing cosmetic composition of the present invention, after shaking and allowing it to stand to separate into an oil phase and an aqueous phase, it is preferable from an aesthetic standpoint that the interface between the oil phase and the aqueous phase is clearly visible as a single line when viewed from the side.

[0040] The two-layer cleansing cosmetic composition of the present invention can be manufactured by appropriately mixing predetermined components according to conventional methods, and can be manufactured by uniformly mixing and dispersing all components regardless of the order in which they are mixed.

[0041] The two-layer cleansing cosmetic of the present invention, from the viewpoint of improving the cleansing power against stubborn makeup, reducing stickiness and greasiness of the skin after use, preferably has a total content of oil phase components including component (A) of 10 to 60% by mass of the total composition, more preferably 21 to 45% by mass, and even more preferably 22 to 33% by mass. Furthermore, the two-layer cleansing cosmetic of the present invention improves the cleansing power against stubborn makeup, reduces stickiness on the skin after use, reduces greasiness on the skin after use, improves the moisturizing effect on the skin after use, optimizes the speed at which the two layers separate after shaking, and ensures clean separation of the two-layer interface after shaking. From this viewpoint, the total content of aqueous phase components including components (B) and (C) is preferably 40 to 90% by mass of the total composition, more preferably 45 to 78% by mass, even more preferably 55 to 77% by mass, and even more preferably 67 to 76% by mass.

[0042] In the present invention, the mass ratio (oil phase) / (aqueous phase) of the oil phase containing component (A) to the aqueous phase containing components (B) and (C) is preferably 0.2 to 1.5, more preferably 0.28 to 0.7, even more preferably 0.3 to 0.67, and still more preferably 0.32 to 0.5, from the viewpoint of improving cleansing power against hard-to-remove makeup, reducing stickiness on the skin after use, reducing greasiness on the skin after use, improving the moisturizing feeling on the skin after use, optimizing the speed at which the two layers separate after shaking, and cleanly separating the interface between the two layers after shaking.

[0043] The two-layer cleansing cosmetic of the present invention is suitable for removing makeup, and exhibits excellent removal effects on eye makeup such as mascara, eyeliner, eyeshadow, and eyebrow products, as well as lip makeup such as lipstick. It can also be suitably used to remove base makeup such as foundation and sunscreen. The two-layer cleansing cosmetic of the present invention can be used by shaking it to make it uniform, then impregnating it into a base material such as nonwoven fabric or cotton, and wiping away makeup and sebum. [Examples]

[0044] Examples 1-10 and Comparative Examples 1-2 Two-layer cleansing cosmetics with the composition shown in Table 1 were manufactured, and their cleansing power against lipstick, cleansing power against eyeliner, lack of stickiness on the skin after use, lack of greasiness on the skin after use, moisturizing effect on the skin after use, separation speed of the two layers, and separation quality of the two layers were evaluated. The results are also shown in Table 1.

[0045] (Manufacturing method) The oil phase and aqueous phase components were mixed separately and stirred using a propeller mixer. Then, the oil phase and aqueous phase were mixed together and filled into a container to obtain a two-layer cleansing cosmetic.

[0046] (Evaluation method) (1) Cleaning power against lipstick (evaluated with a colorimeter): Apply lipstick (Kanebo N Rouge PK-155) to a 3cm x 3cm area of ​​skin on the inside of the forearm between the wrist and elbow (1.4mg / cm²). 2 The mixture was left for 30 minutes. After that, 2.0g of the two-layer cleansing cosmetic, which had been shaken to make it uniform, was soaked into a cotton pad (Kanebo Beauty Works Daily Cotton, 45mm x 65mm) and the skin was wiped repeatedly about 5 times with the cotton pad. The Lab was measured using a colorimeter (CM-2600d, Minolta) and the cleansing rate was determined by the difference from the original skin. The results are shown as the average of 5 trials. (Calculation of cleaning rate) Let Lst, ast, and bst be the skin's Labs before applying lipstick. Let the skin labs after applying lipstick be designated as L1, a1, and b1. Let the skin labs after washing off lipstick be L2, a2, and b2. The color difference before cleaning (ΔE1) and the color difference after cleaning (ΔE2) are calculated using the following formulas. ΔE1={(L1-Lst)2+(a1-ast)2+(b1-bst)2}1 / 2 ΔE2={(L2-Lst)2+(a2-ast)2+(b2-bst)2}1 / 2 The cleaning rate is calculated using the following formula. Note that a higher number indicates greater cleaning power. Cleaning rate (%) = {1 - (ΔE2 / ΔE1)} × 100

[0047] (2) Cleansing power against eyeliner (evaluated with a colorimeter): The cleaning rate was determined in the same manner as in (1), except that an eyeliner containing a film-forming component (KATE Deep Liquid Eyeliner WP N) was used. The results are shown as the average of three trials.

[0048] (3) No stickiness on the skin after use: Five evaluators applied makeup (KATE Secret Skin Maker Zero (Liquid)) to their faces, then took 2g of the two-layer cleansing cosmetic (after shaking to ensure uniformity) onto a cotton pad and removed the makeup. The degree of stickiness on the skin after removal was evaluated according to the following criteria. The results are shown as the total score from the five evaluators. 5: I don't feel any stickiness at all. 4: It doesn't feel sticky. 3: It feels almost completely non-sticky. 2: It feels sticky. 1: It feels very sticky.

[0049] (4) No stickiness on the skin after use: Five evaluators applied makeup (KATE Secret Skin Maker Zero (Liquid)) to their faces, then took 2g of the two-layer cleansing cosmetic, which had been shaken to ensure uniformity, onto a cotton pad and removed the makeup. The degree of stickiness on the skin after removal was evaluated according to the following criteria. The results are shown as the total score from the five evaluators. 5: I don't feel any sliminess at all. 4: It doesn't feel slimy. 3: It feels almost nonexistent. 2: It feels slimy. 1: It feels very slimy.

[0050] (5) Moisture feeling of the skin after use: Five evaluators applied makeup (KATE Secret Skin Maker Zero (Liquid)) to their faces, then took 2g of the two-layer cleansing cosmetic, which had been shaken to make it uniform, onto a cotton pad and removed the makeup. The moisturizing effect of the skin after removal was evaluated according to the following criteria. The results are shown as the total score from the five evaluators. 5: I feel it's very moisturizing. 4: I feel a moisturizing effect. 3: I feel a slight moisturizing effect. 2: I don't feel much moisturizing effect. 1: I don't feel any moisturizing effect at all.

[0051] (6) Separation speed of the two layers: Each two-layer cleansing cosmetic was filled into a transparent polypropylene container (model number PV-50, manufactured by Nikko Co., Ltd.), shaken up and down 10 times, and the time (in seconds) until the two layers separated to the point where the boundary between the oil phase and the water phase was clearly visible as a single line was measured. However, if the separation was not clear, the time was measured until no further change occurred in the state of the boundary between the oil phase and the water phase. Furthermore, if this time is less than 30 seconds, the separation will be uneven during use, causing usability problems, and if separation does not occur even after 300 seconds or more, it is undesirable from an aesthetic standpoint.

[0052] (7) Separability of the two layers: Each two-layer cleansing cosmetic was filled into a transparent polypropylene container (model number PV-50, manufactured by Nikko Co., Ltd.), shaken up and down 10 times, and then the state of the layers was visually observed after 5 minutes and evaluated according to the following criteria. If the interface between the two layers is not visible or if the two layers have not separated, the aesthetic quality is undesirable. 5: When viewed from the side, the boundary between the two layers is clearly visible as a single line, making the boundary clearly identifiable and demonstrating that the layers are separated. 4: The interface between the two layers appears slightly uneven when viewed from the side, but the interface is still discernible, clearly indicating that the layers are separated into two distinct zones. 3: The interface between the two layers is blurred when viewed from the side, but the interface is still discernible, and it can be seen that the two layers are separated. 2: The boundary between the two layers is not visible when viewed from the side, and the two layers are not clearly separated, or there are three layers. 1: Not separated.

[0053] [Table 1]

[0054] *1 Dioctyl ether; Cetiol OE (manufactured by BASF Japan) *2 Light liquid isoparaffin; Markazol® (manufactured by Maruzen Petrochemical Co., Ltd.) *3 Liquid paraffin; LILAC (manufactured by Sonneborn, LLC) *4 Tris(trimethylsiloxy)methylsilane; TMF 1,5 (manufactured by Shin-Etsu Chemical Co., Ltd.) *5 Dipentaerythrityl tripolyhydroxystearate; Saracos WO-6 (manufactured by Nisshin Oillio Co., Ltd.) *6 Polyoxybutylene polyoxyethylene polyoxypropylene glyceryl ether (3B.O.)(8E.O.)(5P.O.); Wilbride S-753 (manufactured by NOF Corporation), *7 Dipropylene glycol; DPG (manufactured by ADEKA)

Claims

1. The following components (A), (B), and (C): (A) A liquid oil containing ether oil at 25°C, (B) General formula (1): 【Chemistry 1】 (In the formula, Gly represents the residue obtained by removing the hydroxyl group from glycerol, PO represents an oxypropylene group, EO represents an oxyethylene group, a and b are the average number of moles of PO and EO added, respectively, with values ​​from 1 to 50, the mass ratio of PO to EO (PO / EO) is from 1 / 5 to 5 / 1, BO represents an oxyalkylene group with 4 carbon atoms, and c is the average number of moles of BO added, with values ​​from 1 to 5) Glycerin derivatives represented by (C) Water A two-layer cleansing cosmetic containing [ingredient name].

2. The two-layer cleansing cosmetic composition according to claim 1, wherein the mass ratio (oil phase) / (aqueous phase) of the oil phase containing component (A) to the aqueous phase containing components (B) and (C) is 0.2 to 1.

5.

3. A two-layer cleansing cosmetic composition according to claim 1 or 2, wherein the content of component (A) is 10 to 60% by mass.

4. A two-layer cleansing cosmetic according to any one of claims 1 to 3, wherein the content of component (B) is 0.1 to 12% by mass.

5. A two-layer cleansing cosmetic composition according to any one of claims 1 to 4, wherein component (B) is polyoxybutylene polyoxyethylene polyoxypropylene glyceryl ether (3BO) (8EO) (5PO).

6. Furthermore, the two-layer cleansing cosmetic composition according to any one of claims 1 to 5, further comprising (D) a polyhydric alcohol other than component (B).

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