Time-mixed cosmetics

Abstract

To provide ready-to-use mixable cosmetics in which at least one selected from a group consisting of ester oil in liquid form at 25°C and vegetable oil in liquid form at 25°C and hydrocarbon oil are blended as an oil agent in large amount, the cosmetics having excellent formulation stability (emulsion stability and stability over time), as well as excellent penetration and occlusion sensation.SOLUTION: A ready-to-use cosmetics in which oil-based and water-based cosmetics are mixed at a ratio of 1:2 to 1:8 by weight to prepare an emulsion at the time of use. The oil-based cosmetic comprises: (a) 0.1 to 4% by mass of a nonionic surfactant with an HLB value of 8 to 12 in the oil-based cosmetic, (b) at least one selected from the group consisting of (b1) ester oil in liquid form at 25°C and (b2) vegetable oil in liquid form at 25°C, and (c) hydrocarbon oil.SELECTED DRAWING: None

Description

[Technical Field]

[0001] The present invention relates to a cosmetic preparation that is mixed before use. [Background technology]

[0002] One form of emulsion cosmetic that is mixed before use is a mix-at-use cosmetic in which an aqueous cosmetic and an oil-based cosmetic are mixed at the time of use to achieve a uniform emulsion. Compared to conventional emulsion cosmetics, mix-at-use cosmetics do not require consideration of stability over time and are characterized by a wide range of aqueous and oil-based components to choose from. However, because mixing is performed using weak force, such as manual stirring, it is difficult to achieve a uniform emulsion, resulting in issues such as stickiness and reduced usability. Mix-at-use cosmetic preparations with excellent emulsion state and usability have been investigated. For example, a technology has been disclosed in which a mix-at-use cosmetic is composed of an aqueous cosmetic containing a polysaccharide and / or polypeptide-based thickener and a nonionic surfactant with an HLB of 12 or higher, and an oil-based cosmetic containing a fatty acid triglyceride with one or more fatty acid groups having 10 to 22 carbon atoms and a branched hydrocarbon, where the emulsion system quickly breaks down upon application to the skin, resulting in an excellent feel that the cosmetic blends seamlessly into the skin (see, for example, Patent Document 1). Furthermore, a technology has been disclosed for a two-component sheet-type cosmetic in which a sheet material is pre-impregnated with a first component containing at least one water-soluble polymer selected from the group consisting of a carboxyvinyl polymer and a copolymer of a long-chain alkyl acrylate monomer and an olefinically unsaturated carboxylic acid monomer, and a second component containing an oily component and 5 to 15% by mass of a surfactant is added at the time of use to prepare an emulsion, which provides excellent moisturizing properties, a pleasant feel, and ease of use, while improving the condition of the skin (for example, Patent Document 2). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 2019-119791 [Patent Document 2] Japanese Patent Application Laid-Open No. 2012-31097 Summary of the Invention [Problem to be solved by the invention]

[0004] However, although the technology disclosed in Patent Document 1 provides an excellent feeling of penetration, it is sometimes desirable to further improve emulsion stability, and it is difficult to obtain a feeling of occlusion after use. The technology disclosed in Patent Document 2 is excellent in terms of non-stickiness, but in some cases it may be desirable to further improve the formulation stability (emulsion stability and stability over time), and furthermore the penetration feeling and occlusive feeling after use may be insufficient. Furthermore, by combining the technologies of the above two documents, it is possible to produce a sheet-type cosmetic that is mixed before use and has good emulsion stability, a good penetration feeling, and no stickiness. However, it has been difficult to achieve these effects as well as a good occlusive feeling after use and stability over time after the sheet material is impregnated.

[0005] The present invention aims to provide a pre-mixed cosmetic composition that contains a large amount of hydrocarbon oil and at least one oil selected from the group consisting of ester oils that are liquid at 25°C and vegetable oils that are liquid at 25°C, and that has excellent formulation stability (emulsion stability and stability over time) and also provides excellent penetration and occlusive feeling. [Means for solving the problem]

[0006] As a result of extensive research into solving the above-mentioned problems, the present inventors discovered that specific nonionic surfactants with an HLB of 8 to 12 are capable of stably emulsifying oily agents, and that the above-mentioned problems can be solved by preparing a mix-at-time cosmetic in which an oil-based cosmetic containing at least one selected from the group consisting of ester oils that are liquid at 25°C and vegetable oils that are liquid at 25°C and a hydrocarbon oil is mixed with an aqueous cosmetic at the time of use, thereby arriving at the present invention.

[0007] That is, the present invention provides the following. [1] The following components (a) to (c): (a) a nonionic surfactant having an HLB of 8 to 12 is added to an oil-based cosmetic composition in an amount of 0.1 to 4% by mass; (b) at least one selected from the group consisting of (b1) ester oils that are liquid at 25°C and (b2) vegetable oils that are liquid at 25°C; (c) Hydrocarbon oil The oil-based cosmetic and the aqueous cosmetic containing the above are mixed at a weight ratio of 1:2 to 1:8 at the time of use to prepare an emulsion. [2] In the oil-based cosmetic, the mass ratio of the components (b) and (c) [(b) / ((b)+(c))] is 0.5 to 0.9, and the mass ratio of the components (b) and (c) [(c) / ((b)+(c))] is 0.1 to 0.5. [3] The pre-mix type cosmetic preparation according to [1] or [2] above, wherein component (b) comprises a combination of component (b1), an ester oil that is liquid at 25°C, and component (b2), a vegetable oil that is liquid at 25°C, and the mass ratio of components (b1) and (b2) [(b2) / ((b1)+(b2))] is 0.3 to 0.6. [4] The pre-mix type cosmetic preparation according to any one of [1] to [3] above, wherein the component (a) is one or more selected from the group consisting of polyoxyethylene glycerin fatty acid esters, polyoxyethylene sorbitan fatty acid esters, and polyoxyethylene sorbit fatty acid esters. [5] The pre-use mix-type cosmetic preparation according to any one of [1] to [4] above, wherein the component (a) contains a branched fatty acid group having 12 to 22 carbon atoms and / or an unsaturated fatty acid group having 12 to 22 carbon atoms. [6] The pre-mix type cosmetic preparation according to [5] above is characterized in that the component (a) contains a fatty acid group consisting of oleic acid and / or isostearic acid. [7] The pre-mix type cosmetic preparation according to any one of [1] to [6] above, wherein the component (a) is one or more selected from polyoxyethylene sorbitan trioleate (20E.O.), sorbeth-30 tetraoleate, PEG-8 glyceryl isostearate, and PEG-20 glyceryl triisostearate. [8] The mix-at-time cosmetic according to any one of [1] to [7] above, wherein the viscosity of the aqueous cosmetic at 25°C is 3,000 mPa·s or less. [9] The aqueous cosmetic further contains a polyhydric alcohol as component (d), and the mass ratio of component (a) to component (d) in the aqueous cosmetic is the mix-at-time type cosmetic according to any one of [1] to [8] above, wherein the mass ratio [(d) / (a)] of component (a) to component (d) in the mix-at-time type cosmetic is 20 to 1500.

[10] The aqueous cosmetic is the mix-at-time cosmetic according to any one of [1] to [9] above, characterized in that it further contains an amino acid as component (e).

[11] The cosmetic to be mixed before use according to any one of the above [1] to

[10] is used by applying or impregnating a sheet material.

[12] The sheet-form pre-mixed cosmetic according to

[11] above is characterized in that the sheet material is pre-filled in a bag-shaped container.

[13] The sheet-form mix-at-use cosmetic described in

[12] above is characterized in that in the bag-shaped container including a first chamber and a second chamber separated by a partition, the first chamber is filled with an aqueous cosmetic and a sheet material, and the second chamber is filled with an oil-based cosmetic, and at the time of use, the partition separating the first and second chambers is peeled off, and the aqueous cosmetic and the oil-based cosmetic are mixed and held in the sheet material. [Effects of the Invention]

[0008] The mix-at-time cosmetic of the present invention exhibits high emulsion stability immediately after emulsification and over time, even when mixed with an oil-based cosmetic containing at least one selected from the group consisting of ester oils that are liquid at 25°C and vegetable oils that are liquid at 25°C and a hydrocarbon oil, and provides an excellent penetration feel upon application and a occlusive feeling after use. Furthermore, the mix-at-time cosmetic of the present invention does not leave a sticky feeling after use, providing a good feel in use. Furthermore, when the mix-at-time cosmetic of the present invention is applied to or impregnated into a sheet material, it also exhibits excellent stability over time and uniform penetration. DETAILED DESCRIPTION OF THE INVENTION

[0009] Hereinafter, embodiments of the present invention will be described. However, the present invention is not limited to only the following embodiments. In this specification, the range "X to Y" includes X and Y and means "X or more and Y or less." Furthermore, unless otherwise specified, operations and measurements of physical properties, etc. are performed under conditions of room temperature (25°C) and relative humidity of 50%RH.

[0010] When preparing emulsion cosmetics containing large amounts of ester oils or hydrocarbon oils, instability of the emulsion cosmetics becomes a problem. To address this issue, a known solution is to incorporate surfactants, higher alcohols, polymers, etc. to increase the viscosity of the emulsion system. However, concerns remain regarding the stickiness and other adverse effects of the surfactants and polymers on usability, as well as the reduced penetration sensation due to the increased viscosity of the emulsion system. However, by incorporating component (a) into an oil-based cosmetic to create a mix-at-time cosmetic, the emulsification properties immediately after mixing and stability over time are improved, making it possible to provide low-viscosity emulsion cosmetics containing ester oils and hydrocarbon oils. This is because component (a) can be instantly emulsified with weak force, such as by manual stirring, and can stably emulsify large amounts of oils even at a small content. Therefore, the present invention was developed based on the discovery that it is extremely important to select component (a) from the many surfactants available and to incorporate component (a) into the oil-based cosmetic in advance. Furthermore, since it is now possible to incorporate a large amount of oil into a low-viscosity emulsified cosmetic, when applied to the skin, it is possible to simultaneously impart a feeling of penetration and a feeling of occlusion after use.

[0011] (oil-based cosmetics) The oil-based cosmetic of the present invention refers to one in which oil is the continuous phase. As long as oil is the continuous phase, there are no particular limitations on the content, and it may contain aqueous components such as water or ethanol, but from the viewpoints of formulation stability, penetration feeling, occlusive feeling, etc., the content is preferably 10% or less, more preferably 5% or less, and even more preferably 1% or less.

[0012] (Component (a) Nonionic surfactant with HLB of 8 to 12)

[0013] The nonionic surfactant having an HLB value of 8 to 12 (component (a)) used in the present invention is not particularly limited, as long as it is one commonly used in cosmetics, quasi-drugs, pharmaceuticals, etc. Examples include polyoxyethylene alkyl ethers, polyoxyethylene hydrogenated castor oil, polyglycerin fatty acid esters, polyethylene glycol fatty acid esters, polyoxyethylene glycerin fatty acid esters, polyoxyethylene sorbitan fatty acid esters, and polyoxyethylene sorbit fatty acid esters. In the present invention, the nonionic surfactant is preferably selected from the group consisting of polyoxyethylene glycerin fatty acid esters, polyoxyethylene sorbitan fatty acid esters, and polyoxyethylene sorbit fatty acid esters. Furthermore, when component (a) has an ester structure, it is preferably a nonionic surfactant containing a branched fatty acid group and / or an unsaturated fatty acid group having 12 to 22 carbon atoms, and more preferably a nonionic surfactant containing a fatty acid group consisting of oleic acid and / or isostearic acid. Furthermore, in the present invention, from the viewpoint of formulation stability and the like, polyoxyethylene sorbitan trioleate (20E.O.), sorbeth-30 tetraoleate, PEG-8 glyceryl isostearate, and PEG-20 glyceryl triisostearate are even more preferred, and one or more of these can be appropriately selected and used. Commercially available products of these include "Rheodol TW-O320V" and "Rheodol 430V" (Kao Corporation), "EMALEX GWIS-108" and "EMALEX GWIS-320" (Nihon Emulsion Co., Ltd.), etc.

[0014] Here, HLB (Hydphile-Lipophile Balance) in the present invention is an index showing the balance of hydrophilicity and lipophilicity, and is calculated by Oda and Teramura et al. using the following formula (1): HLB = inorganic value (IV) / organic value (OV) × 10 (Equation 1) (See Yoshio Koda, "Organic Conceptual Diagram - Fundamentals and Applications", pp. 11-17, Sankyo Publishing, 1984)

[0015] In the mix-at-time cosmetic of the present invention, the content of component (a) in the oil-based cosmetic is preferably 0.1% by mass (hereinafter, simply "% by mass" will be abbreviated as "%") or more, more preferably 1% or more, from the viewpoint of formulation stability. Furthermore, from the viewpoint of usability such as non-stickiness, the content of component (a) is preferably less than 5%, more preferably 4% or less, and even more preferably 2% or less. If it is 5% or more, usability may be reduced, such as unpleasant stickiness occurring after use.

[0016] (Component (b): at least one selected from the group consisting of ester oil (b1) that is liquid at 25°C and vegetable oil (b2) that is liquid at 25°C)

[0017] Component (b) of the present invention is at least one ester oil selected from the group consisting of (b1) ester oils that are liquid at 25°C and component (b2) vegetable oils that are liquid at 25°C.

[0018] (Component (b1) Ester oil that is liquid at 25°C)

[0019] Component (b1) of the present invention is an ester oil that is liquid at 25°C and is an ester of a linear or branched fatty acid and a linear or branched monohydric or polyhydric alcohol, and component (b2) is an ester oil other than a vegetable oil.

[0020] In the present invention, the fatty acid constituting the ester preferably has a branch or a double bond, and more preferably has a carbon number of 8 to 22, and even more preferably has a carbon number of 8 to 18. Specific examples include glyceryl tri-2-ethylhexanoate, cetyl 2-ethylhexanoate, glyceryl diisostearate, diglyceryl diisostearate, glyceryl triisostearate, diglyceryl triisostearate, trimethylolpropane triisostearate, diglyceryl tetraisostearate, polyglyceryl decaisostearate, isotridecyl isononanoate, pentaerythritol tetra-2-ethylhexanoate, pentaerythritol tetraisostearate, and octyldodecyl oleate.

[0021] In the present invention, the molecular weight of the ester oil that is liquid at 25°C is preferably 600 or less, and more preferably 500 or less. Ester oils with a molecular weight of 600 or less have the effect of imparting a more penetrating feel when applied to the skin, but blending a large amount of highly polar ester oil tends to destabilize the interfacial structure of the emulsified droplets, making the emulsion unstable. However, in this embodiment, by selecting component (a), a more stable emulsified state is formed without the stickiness of the surfactant. Furthermore, in the present invention, it is particularly preferable to use two types of ester oils with a molecular weight of 600 or less in combination.

[0022] (Component (b2) Vegetable oil that is liquid at 25°C)

[0023] Component (b2) vegetable oils that are liquid at 25°C are esters of fatty acids and glycerin (oils and fats) or esters of fatty acids and unsaturated alcohols. Examples of vegetable oils include olive oil, macadamia nut oil, meadowfoam oil, jojoba oil, avocado oil, castor oil, safflower oil, sunflower oil, canola oil, apricot kernel oil, rice germ oil, and rice bran oil.

[0024] The vegetable oil is preferably one in which the fatty acids of the fatty acid esters constituting the vegetable oil contain 60% by weight or more of saturated and unsaturated fatty acids having 18 carbon atoms. Examples of such vegetable oils include olive oil, macadamia nut oil, rice bran oil, soybean oil, and jojoba oil, and rice bran oil is more preferred. Commercially available products include, for example, "Rice Bran Oil" (Oryza Oil & Fat Chemical Co., Ltd.). Furthermore, in the present invention, it is particularly preferred to use two types of vegetable oils in combination that contain 60% by weight or more of saturated and unsaturated fatty acids having 18 carbon atoms.

[0025] Component (b) may be used alone, but a combination of two types is preferred because it provides better formulation stability and penetration sensation. For example, component (b1) may be used alone or in combination, and component (b2) may be used alone or in combination, but a combination of component (b1) and component (b2) is more preferred. Furthermore, in the present invention, it is particularly preferred to contain two or more types of component (b1) and two or more types of component (b2).

[0026] In the mix-at-time cosmetic of the present invention, the content of component (b) is not particularly limited, but from the viewpoints of stability over time, penetration feeling, etc., it is preferably 50% or more, and more preferably 60% or more in the oil-based cosmetic. Moreover, the content of component (b) in the oil-based cosmetic is preferably 90% or less, and more preferably 80% or less.

[0027] Furthermore, it is more preferable to use component (b1) and component (b2) in combination, and the mass ratio of component (b1) to component (b2) [(b2) / ((b1)+(b2))] is preferably 0.2 or more, more preferably 0.3 or more. Furthermore, the mass ratio [(b2) / ((b1)+(b2))] is preferably 0.6 or less, more preferably 0.5 or less.

[0028] The mass ratio of component (a) to component (b) [(b) / (a)] is preferably 10 or more, and from the viewpoint of ease of use such as non-stickiness, more preferably 15 or more. From the viewpoint of formulation stability, the mass ratio [(b) / (a)] is preferably 1,000 or less, more preferably 700 or less, and even more preferably 200 or less.

[0029] (Component (c) Hydrocarbon Oil)

[0030] Hydrocarbon oils are oils composed only of carbon and hydrogen atoms, and include linear, branched, and volatile hydrocarbon oils, etc. Specific examples include α-olefin oligomers, liquid paraffin, liquid isoparaffin, light isoparaffin, light liquid isoparaffin, dodecane, isododecane, tetradecane, isotetradecane, hexadecane, isohexadecane, polybutene, hydrogenated polyisobutene, squalane, synthetic squalane, vegetable squalane, squalene, and petrolatum.

[0031] Among component (c), those having a molecular weight of 200 to 1,000 are preferred from the viewpoint of usability, such as a feeling of blockage and lack of stickiness. Examples of those having a molecular weight of 200 to 1,000 include isohexadecane, light liquid isoparaffin, liquid paraffin, heavy liquid isoparaffin, squalane, synthetic squalane, vegetable squalane, and α-olefin oligomers, with liquid paraffin being more preferred. The molecular weight value can be calculated as the sum of the atomic weights of the atoms constituting the molecule based on the chemical structural formula of the above-mentioned component molecule. In the case of a mixture of components having different molecular weights, such as light liquid isoparaffin, liquid paraffin, heavy liquid isoparaffin, and α-olefin oligomers, the carbon number distribution of these components is calculated, and if 90 mass % or more of the mixture contains components whose molecular weights, converted into molecular weights of each component, fall within the range of 200 to 1,000, the mixture is considered to be a hydrocarbon oil having a molecular weight of 200 to 1,000 in the present invention. Light liquid isoparaffin, liquid paraffin, heavy liquid isoparaffin, and α-olefin oligomers, all of which are listed in the quasi-drug raw material standards, fall under the category of component (c) of the present invention. Commercially available products of these include, for example, "Hicol K-500," "Hicol K-350," and "Hicol K-230" (Kaneda Co., Ltd.), "Pearlream 4," "Pearlream 6," "Pearlream 18," "Pearlream 24," and "Pearlream 46" (NOF Corporation). These may be used singly or in combination of two or more.

[0032] Although not particularly limited, the content of component (c) in the oil-based cosmetic of the present invention is preferably 10% or more, more preferably 30% or more, from the viewpoints of stability over time and ease of use in terms of penetration and occlusion. Furthermore, the content of component (c) in the oil-based cosmetic is preferably 50% or less, more preferably 45% or less.

[0033] The mass ratio of component (a) to component (c) [(c) / (a)] is preferably at least 8, and more preferably at least 30. From the viewpoint of formulation stability, the mass ratio [(c) / (a)] is preferably less than 600, and more preferably 300 or less.

[0034] The mass ratio of components (b) and (c) [(b) / ((b)+(c))] is preferably 0.5 or more, and more preferably 0.6 or more. The mass ratio [(b) / ((b)+(c))] is preferably 0.9 or less, and more preferably 0.8 or less. The mass ratio of components (b) and (c) [(c) / ((b)+(c))] is preferably 0.1 or more, and more preferably 0.3 or more. The mass ratio [(c) / ((b)+(c))] is preferably 0.5 or less, and more preferably 0.45 or less. By setting the mass ratios [(b) / ((b)+(c))] and [(c) / ((b)+(c))] within these ranges, the formulation stability and usability of the mix-at-time cosmetic, such as penetration feel and occlusive feeling, can be improved.

[0035] In addition to the above components (a) to (c), other additives may be added to the oily cosmetic of the present invention. Examples of other additives include surfactants other than component (a), emulsifying aids, oils, powders, UV absorbers, gelling agents, anti-fading agents, antioxidants, preservatives, cosmetic ingredients, fragrances, aqueous ingredients such as moisturizers, lower alcohols, polyhydric alcohols, etc., which may be appropriately contained within a range that does not impair the effects of the present invention.

[0036] The surfactant may be any surfactant other than component (a) that is commonly used in cosmetics, such as a nonionic surfactant, an anionic surfactant, a cationic surfactant, or an amphoteric surfactant.

[0037] Examples of the emulsifying aid include higher alcohols, monoglyceryl ethers, and monoglyceryl fatty acid esters.

[0038] The oil agent is any oil other than component (b) and component (c) that is typically used in cosmetics, and examples thereof include fats and oils, fatty acids, silicone oils, fluorine-based oils, lanolin derivatives, etc., regardless of their origin (e.g., animal oil, synthetic oil) or their properties (e.g., semi-solid oil, liquid oil, volatile oil, etc.). Specific examples include fatty acids such as isostearic acid and oleic acid, silicone oils such as low-polymerization dimethylpolysiloxane, methylphenylpolysiloxane, decamethylcyclopentasiloxane, octamethylcyclotetrasiloxane, crosslinked organopolysiloxane, and fluorine-modified polysiloxane, and fluorine-based oil agents such as perfluorodecane and perfluorooctane.

[0039] The powder component can be any powder typically used in cosmetics, and is not particularly limited by its shape (e.g., spherical, plate-like, acicular, etc.), particle size (e.g., mist-like, fine particles, pigment-grade, etc.), particle structure (e.g., porous, non-porous, etc.), and examples thereof include inorganic powders, glitter powders, organic powders, pigment powders, metal powders, composite powders, etc. These may be surface-treated with fluorine compounds, silicone oils, powders, oils, gelling agents, emulsion polymers, surfactants, etc. One or more of these powders may be used, and they may also be combined.

[0040] Examples of ultraviolet absorbers include benzophenone-based, PABA-based, cinnamic acid-based, and salicylic acid-based absorbers, such as 4-tert-butyl-4'-methoxydibenzoylmethane, oxybenzone, 2-ethylhexyl paramethoxycinnamate 2,4,6-tris[4-(2-ethylhexyloxycarbonyl)anilino]-1,3,5-triazine, diethylaminohydroxybenzoylhexyl benzoate, and bisethylhexyloxyphenol methoxyphenyl triazine.

[0041] Examples of antioxidants include tocopherol and ascorbic acid, examples of cosmetic ingredients include vitamins, anti-inflammatory agents, and herbal medicines, and examples of preservatives include parahydroxybenzoic acid esters and phenoxyethanol.

[0042] (Water-based cosmetics) The aqueous cosmetic preparation of the present invention refers to one in which the continuous phase is water or an aqueous solution of a water-soluble solvent. As long as the continuous phase is water or an aqueous solution of a water-soluble solvent, the amount of oily components such as oils may be included, but is not particularly limited thereto. From the viewpoints of formulation stability, penetration sensation, occlusive feeling, etc., the amount of oily components is preferably 5% or less, more preferably 1% or less, and even more preferably 0.5% or less.

[0043] The water contained in the aqueous cosmetic is used as a dispersion medium for the oily agent, and is not particularly limited as long as it is water that is normally used in cosmetics, but examples include purified water, distilled water, ion-exchanged water, tap water, hot spring water, deep sea water, etc. The water content in the aqueous cosmetic is not particularly limited, but is preferably 30 to 100%, and more preferably 40 to 90%.

[0044] (Component (d): Polyhydric alcohol)

[0045] In the present invention, by further containing component (d) a polyhydric alcohol, it is possible to improve the stability of the preparation and ease of use such as penetration feeling and occlusion feeling.

[0046] Examples of component (d) include propylene glycol, dipropylene glycol, 1,3-butylene glycol, 1,2-pentanediol, glycerin, diglycerin, tripropylene glycol, polyethylene glycol, sorbitol, etc., and one or more of these may be appropriately selected and used as needed. Among these, glycerin and 1,3-butylene glycol are preferred.

[0047] The content of component (d) in the aqueous cosmetic is not particularly limited, but is preferably 5% or more, more preferably 10% or more, and the content of polyhydric alcohol is preferably 30% or less, more preferably 20% or less.

[0048] Furthermore, in the mix-at-time cosmetic preparation, the content mass ratio of component (a) to component (d) [(d) / (a)] is preferably at least 20, and more preferably at least 40. From the viewpoint of formulation stability, the content mass ratio [(d) / (a)] is preferably at most 1500, more preferably at most 1000, and even more preferably at most 800. By keeping the content within this range, the emulsion stability and stability over time immediately after mixing of the mix-at-time cosmetic preparation, as well as usability such as stickiness, are improved.

[0049] (Component (e): Amino acid)

[0050] The present invention may further contain component (e) an amino acid. By containing an amino acid in the pre-mix type cosmetic of the present invention, not only is the formulation stability as an emulsion cosmetic improved, but also a good penetration feeling is achieved when applied to the skin.

[0051] Examples of the amino acid component (e) of the present invention include glycine, alanine, valine, isoleucine, threonine, leucine, histidine, tryptophan, serine, threonine, aspartic acid, glutamic acid, asparagine, glutamine, lysine, hydroxylysine, hydroxyproline, arginine, cystine, cysteine, methionine, phenylalanine, tyrosine, proline, ornithine, citrulline, theanine, etc. Among these, cyclic amino acids are preferred, and hydroxyproline is more preferred.

[0052] The content of component (e) in the aqueous cosmetic is not particularly limited, but is preferably 0.001% or more, more preferably 0.01% or more, and is preferably 1% or less, more preferably 0.5% or less, in the aqueous cosmetic.

[0053] In addition to the above-mentioned components, other additives may be added to the aqueous cosmetic preparation of the present invention, such as surfactants, water-soluble polymers, lower alcohols, and aqueous components such as moisturizers, preservatives, chelating agents, cosmetic ingredients, oils, and fragrances, as appropriate, within the scope that does not impair the effects of the present invention.

[0054] Examples of water-soluble polymers include carrageenan, xanthan gum, methyl cellulose, hydroxyethyl cellulose, carboxymethyl cellulose, carboxyvinyl polymer, alkyl-modified carboxyvinyl polymer, polyvinyl alcohol, polyvinylpyrrolidone, (sodium acrylate / sodium acryloyldimethyltaurate) copolymer, (PEG-240 / decyltetradeceth-20 / HDI) copolymer, etc. Among these, carboxyvinyl polymer, alkyl-modified carboxyvinyl polymer, and xanthan gum are preferred, and one or more types can be appropriately selected and used as needed.

[0055] The content of the water-soluble polymer in the aqueous cosmetic is not particularly limited, but is preferably 1% or less, more preferably 0.5% or less, and from the viewpoint of usability such as penetration feeling and non-stickiness, it is even more preferably 0.3% or less.

[0056] Examples of moisturizing agents include polyoxyalkylene glyceryl ether and polyoxyalkylene alkyl glucoside.

[0057] The state of the aqueous cosmetic preparation is not particularly limited, but is preferably in a liquid to gel state in order to obtain the effects of the present invention. Here, a liquid to gel state means that the viscosity measured at 25°C using a Brookfield rotational viscometer is 5,000 mPa·s or less, preferably 3,000 mPa·s or less, and more preferably 2,000 mPa·s or less.

[0058] In the mix-before-use cosmetic of the present invention, the weight ratio of the oil-based cosmetic to the aqueous cosmetic is in the range of 1:2 to 1:8. When the oil-based cosmetic:aqueous cosmetic ratio is in this range, the formulation stability of the mix-before-use cosmetic is ensured. The oil-based cosmetic:aqueous cosmetic ratio is preferably 1:2 to 1:4, and more preferably 1:4.

[0059] The mix-at-time cosmetic of the present invention can be implemented as an emulsion cosmetic of the O / W type, W / O type, O / W / O type, W / O / W type, etc., but an O / W type emulsion cosmetic is preferred in order to obtain the effects of the present invention.

[0060] From the viewpoint of obtaining a cosmetic product with excellent stability over time and excellent penetration feeling, the particle size of the dispersed droplets in the mix-at-time cosmetic of the present invention is preferably 5 to 30%, and more preferably 10 to 20%, of which the percentage of dispersed droplets has a particle size of 10 μm or more. Note that the particle size of the dispersed droplets here is a value obtained by observing a mix-at-time cosmetic product immediately after preparation under the conditions of Evaluation Method 1 described below with an optical microscope (200x magnification) and measuring the particle size of 100 dispersed droplets randomly selected per field of view. Using this value, the percentage of dispersed droplets with a particle size of 10 μm or more can be calculated.

[0061] The mix-at-time cosmetic preparation of the present invention can be implemented in various forms, such as liquid, gel, emulsion, and cream, and is preferably in a liquid state at 25° C. In this specification, being in a liquid state at 25° C. means that the cosmetic preparation has sufficient fluidity at 25° C. Specifically, this means that the viscosity measured at 25° C. using a Brookfield rotational viscometer is 5,000 mPa s or less.

[0062] The cosmetic preparation of the present invention to be mixed before use is not particularly affected by the container, etc., but the following aspects can be mentioned as an example for effectively carrying out mixing before use. The cosmetic composition can be prepared by filling the aqueous cosmetic composition and the oil-based cosmetic composition into separate containers, mixing them at a specific weight ratio, then closing the lid and shaking. Alternatively, a pre-sealed bag containing the appropriate amounts can also be used, and is preferable if it is equipped with a mixing mechanism, as this eliminates the need for transfer.

[0063] The pre-mix cosmetic of the present invention can also be used as a topical skin preparation. Examples include topical liquid preparations, gel preparations, cream preparations, ointments, liniments, etc. The method of use can be the same as that of the cosmetic preparations described above.

[0064] The mix-at-use cosmetic of the present invention can be used as a cosmetic for a variety of purposes. Examples of such cosmetics include emulsions, creams, serums, massage cosmetics, pack cosmetics, hand creams, body lotions, body creams, makeup cosmetics, cosmetic bases, eye creams, sunscreens, hair creams, and hair waxes. Among these, skin care cosmetics such as emulsions, creams, serums, massage cosmetics, pack cosmetics, hand creams, body lotions, and body creams are preferred. Examples of methods for use include application to hands, fingers, or cotton, or impregnation into sheet materials. In the present invention, it is more preferred to use a sheet-type cosmetic that is applied to or impregnated into a sheet material. Forming the cosmetic into a sheet-type cosmetic is preferred in that it provides sufficient moisture and active ingredients to the skin, resulting in superior moisturizing and emollient effects, and a more occlusive feeling after use.

[0065] The sheet material to be impregnated with the pre-mix cosmetic preparation of the present invention is a sheet made by intertwining fibers such as natural fibers and synthetic fibers without weaving them, and may be obtained by either a wet manufacturing method or a dry manufacturing method. Fibers used in the sheet material include cotton, wool, hemp, pulp, silk, rayon, nylon, polyester, polypropylene, acrylic fibers, vinylon, and aramid fibers, and one or more of these may be appropriately selected and used as needed. Among these, cotton and / or rayon are preferred in terms of stability and adhesion to the skin.

[0066] The sheet material to be impregnated with the pre-mix cosmetic of the present invention preferably has a thickness of 0.5 to 10 mm per sheet and a mass of 15 g or less per sheet after impregnation, from the viewpoint of ease of use, such as a good adhesion during use and ease of peeling, and more preferably has a thickness of 0.7 to 5 mm and a mass of 10 g or less. The basis weight of the sheet material used in the present invention is 15 to 300 g / m², from the viewpoint of a good adhesion during use and prevention of peeling. 2 is preferable, and more preferably, 30 to 120 g / m 2Furthermore, in terms of ease of application and removal when applying to the application site, the area of ​​one sheet of material is set to 1 to 400 cm. 2 The amount of the oil-in-water cosmetic of the present invention impregnated into the sheet material is preferably 2 to 15 times, more preferably 3 to 10 times, the amount of the sheet material to be impregnated.

[0067] The method for impregnating the sheet material with the pre-mix cosmetic of the present invention is not particularly limited, and can be carried out by any known means.

[0068] In the present invention, it is preferable to use an embodiment in which the sheet material is filled in a bag-shaped container in advance, and from the viewpoint that uniform impregnation without unevenness in impregnation is possible and the effects of the present invention can be further enhanced, the following embodiment is more preferable.

[0069] In this bag-shaped container, which includes a first compartment and a second compartment separated by a partition, the first compartment is filled with an aqueous cosmetic and a sheet material, and the second compartment is filled with an oil-based cosmetic. Upon use, the partition separating the first and second compartments is peeled away, and the aqueous cosmetic and oil-based cosmetic are mixed and held in the sheet material. The partition between the first and second compartments has a weakened zone that can be deformed or destroyed by the action of an external force, and is formed by a joint that is weaker than the joint at the outer periphery. Upon use, the partition peels away due to the action of an external force, connecting the first and second compartments, allowing the oil-based cosmetic from the second compartment to be introduced into the first compartment and mixed and emulsified. Examples of external forces include pressure, shear force, and heat.

[0070] In the bag-shaped container, the volume ratio between the first chamber filled with the aqueous cosmetic and the sheet material and the second chamber filled with the oil-based cosmetic is not particularly limited, but from the viewpoint of uniform impregnation of the sheet material, it is more preferable that the volume ratio of the first chamber:the second chamber is 1:2.

[0071] Furthermore, in the present invention, it is preferable that a portion of the bag-shaped container is made of a transparent film, and more preferably, one side (half side) of the bag-shaped container is made of a transparent film, so that the state during mixing can be easily observed. The transparent film can be made of PET (polyethylene terephthalate), PE (polyethylene), or the like. However, in the present invention, a multilayer film having multiple layers is preferable, and it is more preferable that the outermost inner film is PE, and a film with a two-layer structure of PET / PE (outermost film / innermost film) is even more preferable. Furthermore, in the bag-shaped container, the portion that is not made of transparent film is preferably an aluminum laminate film with a three-layer structure of PET / AL (aluminum) / PE (outermost film / intermediate film / innermost film), and the outer edge of the transparent film is adhered to the aluminum laminate film. Using a film made of the above material improves formulation stability and impregnation uniformity.

[0072] The shape of the bag-like container is not particularly limited, and examples thereof include an oval, a circle, a semicircle, a heart, a semi-oval, a square, a rectangle, etc. In the present invention, a square or a rectangle is preferred, and the outer dimensions are preferably 10 to 15 cm x 10 to 15 cm, and more preferably 16 cm x 14 cm.

[0073] (Manufacturing method) The method for producing the mix-at-time cosmetic of the present invention is not particularly limited as long as it is a known method, and it can be produced by, for example, uniformly mixing an oil-based cosmetic containing components (a) to (c) and an aqueous cosmetic at a specific weight ratio. [Example]

[0074] The effects of the present invention will be explained using the following examples and comparative examples, although the technical scope of the present invention is not limited to the following examples.

[0075] Examples 1 to 19 and Comparative Examples 1 to 11: Cosmetics to be mixed before use (milk) After preparing the aqueous and oil-based cosmetics with the compositions shown in Tables 1 and 2, they were mixed in the proportions shown in Tables 3 and 4 to prepare mix-at-time cosmetics, and the formulation stability (emulsion stability and stability over time), penetration sensation, occlusive feeling, and non-stickiness were evaluated using the methods described below. The results are also shown in Tables 3 and 4.

[0076] Table 1 JPEG0007798502000001.jpg86170

[0077] Table 2-1 JPEG0007798502000002.jpg131170Table 2-2 JPEG0007798502000003.jpg138170

[0078] Table 3-1 JPEG0007798502000004.jpg78170 Table 3-2 JPEG0007798502000005.jpg83170

[0079] Table 4 JPEG0007798502000006.jpg70170

[0080] <Water-based cosmetics> The mixture was mixed uniformly at 25°C to obtain an aqueous cosmetic preparation. <Oily based cosmetics> Components (a) to (c) were mixed uniformly at 25°C to obtain an oil-based cosmetic preparation. <Cosmetics that can be mixed at the time of use> The aqueous cosmetic and oil-based cosmetic prepared above were mixed uniformly at a predetermined weight ratio.

[0081] (Evaluation method 1: Emulsion stability) Emulsion stability was evaluated according to the following four-level evaluation criteria, based on the number of times the bottle was turned upside down until a uniform emulsion (cloudy white state) was achieved. The amounts of the aqueous and oil-based cosmetics in the glass bottles were adjusted according to the weight ratios shown in Tables 3 and 4. 4-level evaluation criteria (Judgment): (Judgment criteria) ◎ :3 times or less ○: 5 times or less △: 10 times or less ×: 11 or more times

[0082] (Evaluation method 2: Stability over time) For stability over time, after preparation, each cosmetic was left to stand at 25°C and its appearance was checked. The time required for drainage or separation was used to evaluate stability according to the following four-level evaluation criteria. 4-level evaluation criteria (Judgment): (Judgment criteria) ◎ : 1 hour or more ○: 30 minutes or more △: 10 minutes or more ×: Less than 10 minutes

[0083] (Evaluation method 3: Penetration) Regarding the feeling of penetration, a use test was conducted by a panel of 20 experts in cosmetic evaluation. After applying each cosmetic to the entire face, each panelist rated the feeling of penetration during use on a 5-point scale using the absolute evaluation below, and gave a score. The average score was calculated from the total scores of all panelists for each cosmetic, and the score was judged according to the 3-point rating criteria below. Absolute evaluation criteria (Rating): (Evaluation) 5: Very sensitive 4: Somewhat 3: Normal 2: I don't feel it much 1: I don't feel it Three-level evaluation criteria (Judgment): (Average score) ◎: 4 points or more: Very good ○: 3 points or more but less than 4 points: Good ×: 1 point or more but less than 3 points: defective

[0084] (Evaluation method 4: Feeling of blockage) Regarding the feeling of occlusion, a use test was conducted by a panel of 20 experts in cosmetic evaluation. After using each cosmetic product on the entire face, each panelist rated the feeling of occlusion after use on a 5-point scale using the absolute evaluation below and gave a score. The average score was calculated from the total scores of all panelists for each cosmetic product, and the results were judged according to the 4-point rating scale below. Absolute evaluation criteria (Rating): (Evaluation) 5: Very sensitive 4: Somewhat 3: Normal 2: I don't feel it much 1: I don't feel it 4-level evaluation criteria (Judgment): (Average score) ◎: 4.5 points or more: extremely good ○: 4 points or more and less than 4.5 points: Very good △: 3 points or more but less than 4 points: Good ×: 1 point or more and less than 3 points: Poor

[0085] (Evaluation method 5: Non-stickiness) Regarding non-stickiness, a use test was conducted by a panel of 20 experts in cosmetic evaluation. After applying each cosmetic to the entire face, each panelist rated the stickiness during use on a 5-point scale using the absolute evaluation below, and gave a score. The average score was calculated from the total scores of all panelists for each cosmetic, and the results were judged according to the 3-point scale below. Absolute evaluation criteria (Rating): (Evaluation) 5: I can't feel it 4: Not much 3: Normal 2: Somewhat 1: Very sensitive Three-level evaluation criteria (Judgment): (Average score) ◎: 4 points or more: Very good ○: 3 points or more but less than 4 points: Good ×: 1 point or more but less than 3 points: defective [Example]

[0086] Examples 1, 6, 12, and 13 and Comparative Examples 1 and 6: Cosmetic preparations to be mixed before use (milk) After preparing aqueous and oil-based cosmetics with the compositions shown in Tables 1 and 2, they were mixed in the proportions shown in Table 5 to prepare mix-at-time cosmetics, which were then evaluated for formulation stability (emulsion stability and stability over time), penetration sensation, occlusive feeling, non-stickiness, and dispersed droplet particle size (proportion of particles with a diameter of 10 μm or more) using the methods described below. The results are also shown in Table 5.

[0087] Table 5 JPEG0007798502000007.jpg79170

[0088] (Evaluation method 6): Particle size of dispersed droplets (percentage of particles with a diameter of 10 μm or more) Regarding the particle size of the dispersed droplets, each cosmetic product prepared under the conditions of Evaluation Method 1 was observed under an optical microscope (200x magnification) immediately after mixing, and the particle size of 100 dispersed droplets randomly selected per field of view was measured. Using these values, the percentage of dispersed droplets with a particle size of 10 μm or more was calculated. [Example]

[0089] Examples 1, 5, 6 and Comparative Examples 1 and 5: Sheet-type cosmetics to be mixed before use After preparing aqueous and oil-based cosmetics with the compositions shown in Tables 1 and 2 below, sheet-type cosmetics to be mixed before use were prepared in the proportions shown in Table 6. The formulation stability (emulsion stability and stability over time), penetration sensation, occlusive feeling, non-stickiness, and impregnation uniformity were evaluated using the methods described below. The results are also shown in Table 6.

[0090] Table 6 JPEG0007798502000008.jpg94170

[0091] (Evaluation method 7: Impregnation uniformity) Regarding the impregnation uniformity, after preparing the sheet-type pre-mixed cosmetic preparations shown in Table 6, the sheet material was unfolded and the impregnation uniformity was visually confirmed, and judged according to the following two-stage judging criteria. Two-stage evaluation criteria (Judgment): (Judgment criteria) ○: There are no uneven areas of impregnation, and the sheet material is uniformly impregnated with the emulsion. ×: There are uneven or non-uniform impregnation areas

[0092] As is clear from the results in Tables 3 and 4, the cosmetics to be mixed before use of Examples 1 to 19 of the present invention were superior in terms of penetration feeling, occlusive feeling after use, and lack of stickiness, as well as in formulation stability, compared to the cosmetics to be mixed before use of Comparative Examples 1 to 10.

[0093] Furthermore, the results of Table 5, which evaluated the particle size of the dispersed droplets (proportion of particles with a diameter of 10 μm or more), showed that when the proportion of dispersed droplets with a particle diameter of 10 μm or more was 5 to 30%, the product had excellent penetration, clogging feeling after use, non-stickiness, and formulation stability.

[0094] Furthermore, as is clear from the results of Table 6 in which the impregnation uniformity was evaluated, the sheet-type cosmetics to be mixed at the time of use of Examples 1, 5, and 6 of the present invention provided a superior occlusive feeling after use and were also superior in uniform impregnation compared to the sheet-type cosmetics to be mixed at the time of use of Comparative Examples 1 and 5.

[0095] In contrast, in Comparative Examples 1 and 2, in which the content of component (a) nonionic surfactant with an HLB of 8 to 12 was 0.05% or 5%, satisfactory formulation stability or non-stickiness was not obtained. Furthermore, in Comparative Examples 3 and 4, in which a nonionic surfactant with a different HLB was used as component (a), satisfactory formulation stability was also not obtained. Furthermore, in Comparative Example 5, which did not contain component (c) hydrocarbon oil, satisfactory formulation stability was not obtained. In Comparative Examples 6 and 7, in which the ratio of oil-based cosmetic to aqueous cosmetic was less than 1:8 (1:9) or more than 1:2 (1:1), satisfactory formulation stability, non-stickiness, and non-stickiness were not obtained. Furthermore, in Comparative Examples 8 to 10, in which component (a) was contained in an aqueous cosmetic instead of an oil-based cosmetic, satisfactory formulation stability was not obtained. Furthermore, in the case of Comparative Example 11, in which the aqueous cosmetic and the oil-based cosmetic were not mixed at the time of use but were prepared by a normal manufacturing method for emulsion cosmetics, the stability over time was excellent, but the usability, such as the feeling of penetration and the feeling of occlusion, was not satisfactory.

[0096] Example 20: Oil-in-water emulsion Water-based cosmetics (ingredients) (mass%) (1) Glycerin (ingredient (d)) 5 (2) Dipropylene glycol (ingredient (d)) 5 (3) 1,3-butylene glycol (component (d)) 5 (4) Xanthan gum 0.5 (5) Remaining purified water (6) Sodium edetate 0.02 (7) Ethanol 3 (8) Proline (component (e) 0.1 (9) Phenoxyethanol 0.2 (10) PEG-50 hydrogenated castor oil isostearate (component (a)) 0.1 Oil-based cosmetics (ingredients) (mass%) (11) PEG-8 glyceryl isostearate (ingredient (a)) 3 (12) Jojoba seed oil (ingredient (b2)) 20 (13) Olive fruit oil (component (b2)) 20 (14) Glyceryl triisostearate (ingredient (b1)) 10 (15) Squalane (ingredient (c)) 20 (16) Liquid paraffin (component (c)) remaining amount (17) Phenoxyethanol 1 (18)Fragrance 0.5

[0097] Water-based cosmetics (manufacturing method) A. Components (1) to (8) were mixed and dissolved uniformly at 25°C. B. Components (9) and (10) were mixed and dissolved uniformly at 50°C. B was added to CA to solubilize it, yielding an aqueous cosmetic preparation with a viscosity of approximately 2,000 mPa·s at 25°C. Oil-based cosmetics (manufacturing method) Components (11) to (18) were mixed uniformly at 25°C to obtain an oil-based cosmetic preparation. Cosmetics to be mixed at the time of use (manufacturing method) The oil-based cosmetic and aqueous cosmetic prepared above were mixed uniformly at a weight ratio of 1:5 to obtain an oil-in-water emulsion. The oil-in-water emulsion obtained in this manner was excellent in formulation stability, penetration feeling, lack of occlusive feeling and stickiness.

[0098] Example 21: Hair Milk Water-based cosmetics (ingredients) (mass%) (1) Glycerin (ingredient (d)) 5 (2) Propylene glycol (ingredient (d)) 20 (3) Xanthan gum 0.2 (4) Carrageenan 0.1 (5) Remaining purified water (6) Sodium monohydrogen phosphate 0.1 (7) Sodium dihydrogen phosphate 0.1 (8) Edetodioate sodium 0.02 Oil-based cosmetics (ingredients) (mass%) (9) Polyoxyethylene sorbitan trioleate (20E.O.) (component (a)) 1 (10) Cetyl ethylhexanoate (ingredient (b1)) remaining amount (11) Isopropyl myristate (ingredient (b1)) 20 (12) 2-Ethylhexyl para-methoxycinnamate 1 (13) Hydrogenated polyisobutene (component (c)) 10 (14) Squalane (ingredient (c)) 20 (15) Dimethicone 5 (16) Stearyl alcohol 0.1 (17) Steartrimonium chloride 0.5 (18) Phenoxyethanol 1 (19)Fragrance 0.5

[0099] Water-based cosmetics (manufacturing method) Components (1) to (8) were mixed and dissolved uniformly at 25°C to obtain an aqueous cosmetic preparation, which had a viscosity of approximately 3,000 mPa·s at 25°C. Oil-based cosmetics (manufacturing method) Components (9) to (18) were mixed and dissolved uniformly at 75°C, and after cooling, component (19) was added to obtain an oil-based cosmetic preparation. Cosmetics to be mixed at the time of use (manufacturing method) The oil-based cosmetic and the aqueous cosmetic prepared above were mixed uniformly in a weight ratio of 1:4 to obtain a hair milk. The hair milk obtained in this manner was excellent in formulation stability, penetration feeling, occlusion feeling, and lack of stickiness.

[0100] Example 22: Body Lotion Water-based cosmetics (ingredients) (mass%) (1) Glycerin (ingredient (d)) 10 (2) Diglycerin (ingredient (d)) 5 (3) Alkyl-modified carboxyvinyl polymer 0.1 (4) Carbomer 0.1 (5) Sodium hydroxide 0.06 (6) Remaining purified water (7) Edetodioate sodium 0.02 Oil-based cosmetics (ingredients) (mass%) (8) Sorbeth-30 tetraoleate (component (a)) 0.5 (9) PEG-20 glyceryl triisostearate (ingredient (a)) 0.5 (10) Glyceryl tri-2-ethylhexanoate (ingredient (b1)) 40 (11) Macadamia nut oil (ingredient (b2)) 10 (12) Rice bran oil (ingredient (b2)) 10 (13) α-olefin oligomer (component (c)) remaining amount (14) Vaseline (ingredient (c)) 5 (15) Stearyl alcohol 0.1 (16) Glyceryl stearate 0.1 (17) Phenoxyethanol 1 (18)Fragrance 0.5

[0101] Water-based cosmetics (manufacturing method) Components (1) to (7) were mixed and dissolved uniformly at 25°C to obtain an aqueous cosmetic preparation, which had a viscosity of approximately 2,000 mPa·s at 25°C. Oil-based cosmetics (manufacturing method) Components (8) to (17) were mixed and dissolved uniformly at 75°C, and after cooling, component (18) was added to obtain an oil-based cosmetic preparation. Cosmetics to be mixed at the time of use (manufacturing method) The oil-based cosmetic and the aqueous cosmetic prepared above were mixed uniformly in a weight ratio of 1:2 to obtain a body lotion. The body lotion obtained in this manner was excellent in formulation stability, penetration feeling, lack of occlusive feeling, and stickiness.

Claims

1. The following components (a) to (c): (a) a nonionic surfactant having an HLB of 8 to 12 in an oil-based cosmetic composition in an amount of 0.1 to 4% by mass; (b) (b1) ester oil that is liquid at 25°C and (b2) vegetable oil that is liquid at 25°C, in an oil-based cosmetic composition in an amount of 50 to 90% by mass; (c) 10 to 50% by mass of hydrocarbon oil in the oil-based cosmetic and an aqueous cosmetic containing the above formula (I) at a weight ratio of 1:2 to 1:8, wherein in the oil-based cosmetic, the mass ratio of the components (b) and (c) [(b) / ((b)+(c))] is 0.5 to 0.9, and the mass ratio of the components (b) and (c) [(c) / ((b)+(c))] is 0.1 to 0.

5.

2. The following components (a) to (c): (a) a nonionic surfactant having an HLB of 8 to 12 in an oil-based cosmetic composition in an amount of 0.1 to 4% by mass; (b) (b1) ester oil that is liquid at 25°C and (b2) vegetable oil that is liquid at 25°C, in an oil-based cosmetic composition in an amount of 50 to 90% by mass; (c) 10 to 50% by mass of hydrocarbon oil in the oil-based cosmetic and an aqueous cosmetic containing the above formula (I) in a weight ratio of 1:2 to 1:8 at the time of use, wherein the component (b) contains a combination of component (b1) an ester oil that is liquid at 25°C and component (b2) a vegetable oil that is liquid at 25°C, and the mass ratio of the components (b1) and (b2) [(b2) / ((b1)+(b2)]] is 0.3 to 0.

6.

3. The following components (a) to (c): (a) a nonionic surfactant having an HLB of 8 to 12 in an oil-based cosmetic composition in an amount of 0.1 to 4% by mass; (b) (b1) ester oil that is liquid at 25°C and (b2) vegetable oil that is liquid at 25°C, in an oil-based cosmetic composition in an amount of 50 to 90% by mass; (c) 10 to 50% by mass of hydrocarbon oil in the oil-based cosmetic and an aqueous cosmetic containing the above-mentioned components in a weight ratio of 1:2 to 1:8 at the time of use, wherein the aqueous cosmetic further contains a polyhydric alcohol as component (d), and the mass ratio of component (a) to component (d) in the mixed-at-time cosmetic [(d) / (a)] is 20 to 1,500.

4. The following components (a) to (c): (a) a nonionic surfactant having an HLB of 8 to 12 in an oil-based cosmetic composition in an amount of 0.1 to 4% by mass; (b) (b1) ester oil that is liquid at 25°C and (b2) vegetable oil that is liquid at 25°C, in an oil-based cosmetic composition in an amount of 50 to 90% by mass; (c) 10 to 50% by mass of hydrocarbon oil in the oil-based cosmetic The oil-based cosmetic and the aqueous cosmetic containing the above are mixed at a weight ratio of 1:2 to 1:8 at the time of use, and the sheet-like mix-at-use cosmetic is used by applying or impregnating a sheet material.

5. The following components (a) to (c): (a) a nonionic surfactant having an HLB of 8 to 12 in an oil-based cosmetic composition in an amount of 0.1 to 4% by mass; (b) at least one selected from the group consisting of (b1) ester oils that are liquid at 25°C and (b2) vegetable oils that are liquid at 25°C; (c) hydrocarbon oil and an aqueous cosmetic containing the above components in a weight ratio of 1:2 to 1:8 at the time of use, wherein the oil-based cosmetic and the aqueous cosmetic are mixed together, in the oil-based cosmetic, the mass ratio of the components (b) and (c) [(b) / ((b)+(c))] is 0.5 to 0.9, and the mass ratio of the components (b) and (c) [(c) / ((b)+(c))] is 0.1 to 0.5, and the sheet-like mix-at-use cosmetic is used by being applied to or impregnated into a sheet material.

6. The mix-at-time cosmetic preparation according to any one of claims 1 to 5, wherein the component (a) is one or more selected from the group consisting of polyoxyethylene glycerin fatty acid esters, polyoxyethylene sorbitan fatty acid esters, and polyoxyethylene sorbit fatty acid esters.

7. The mix-at-time cosmetic preparation according to any one of claims 1 to 6, characterized in that the component (a) contains a branched fatty acid group having 12 to 22 carbon atoms and / or an unsaturated fatty acid group having 12 to 22 carbon atoms.

8. 8. The pre-mix type cosmetic preparation according to claim 7, wherein the component (a) contains a fatty acid group consisting of oleic acid and / or isostearic acid.

9. The mix-at-use cosmetic preparation according to any one of claims 1 to 8, wherein the component (a) is one or more selected from polyoxyethylene sorbitan trioleate (20E.O.), sorbeth-30 tetraoleate, PEG-8 glyceryl isostearate, and PEG-20 glyceryl triisostearate.

10. The mix-at-time cosmetic according to any one of claims 1 to 9, wherein the viscosity of the aqueous cosmetic at 25°C is 3,000 mPa·s or less.

11. The mix-at-time cosmetic according to any one of claims 1 to 10, characterized in that the aqueous cosmetic further contains an amino acid as component (e).

12. 6. The sheet-form pre-mixed cosmetic according to claim 4, wherein the sheet material is packed in a bag-shaped container in advance.

13. 13. The sheet-form mix-in-use cosmetic according to claim 12, characterized in that the bag-shaped container includes a first chamber and a second chamber separated by a partition, the first chamber being filled with an aqueous cosmetic and a sheet material, and the second chamber being filled with an oil-based cosmetic, and the partition separating the first chamber and the second chamber is peeled away at the time of use, allowing the aqueous cosmetic and the oil-based cosmetic to be mixed and retained in the sheet material.

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