JP7798502B2 - Cosmetics that can be mixed at the time of use - Google Patents

Description

The present invention relates to a pre-mix cosmetic product.

One form of emulsified 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 offer a wide range of options for aqueous and oil-based ingredients. 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 compositions with excellent emulsion quality and usability have been explored. For example, a technology has been disclosed for a mix-at-use cosmetic that combines an aqueous cosmetic containing a polysaccharide and/or polypeptide-based thickener and a nonionic surfactant with an HLB of 12 or higher with 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, in which the emulsion system quickly breaks down upon application, resulting in an excellent feel that blends 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 5-15% by mass of a surfactant is added at the time of use to prepare an emulsion, resulting in excellent moisturizing properties, a pleasant feel, and ease of use, while improving skin condition (see, for example, Patent Document 2).

Japanese Patent Application Laid-Open No. 2019-119791 JP 2012-31097 A

However, with the technology disclosed in Patent Document 1, although the feeling of penetration is excellent, there are cases where it is desirable to further improve emulsion stability, and furthermore, 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 further in some cases the feeling of penetration and the feeling of occlusion 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 a non-sticky feeling. However, it has been difficult to achieve these effects as well as a occlusive feeling after use and stability over time after the sheet material is impregnated.

The present invention aims to provide a pre-mix cosmetic 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.

As a result of extensive research to solve the above-mentioned problems, the inventors discovered that certain nonionic surfactants with an HLB of 8 to 12 are capable of stably emulsifying oils. They also discovered that the above-mentioned problems can be solved by creating a mix-at-use 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, as well as a hydrocarbon oil, is mixed with an aqueous cosmetic at the time of use, thereby completing the present invention.

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 in an amount of 0.1 to 4% by mass in an oil-based cosmetic;
(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) A mix-at-use cosmetic in which an oil-based cosmetic containing a hydrocarbon oil and an aqueous cosmetic are mixed at a weight ratio of 1:2 to 1:8 at the time of use to prepare an emulsion.
[2]
[0023] 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 mix-at-time 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 component (b1) to component (b2) [(b2)/((b1)+(b2)]] is 0.3 to 0.6.
[4]
The mix-at-time 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 mix-at-time 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 mix-at-time 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 is the mix-at-time cosmetic according to any one of [1] to [8] above, wherein the aqueous cosmetic further contains a polyhydric alcohol as component (d), and the mass ratio of component (a) to component (d) [(d)/(a)] in the mix-at-time 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.

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. It also provides excellent penetration 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 pleasant feel. Furthermore, when the mix-at-time cosmetic of the present invention is applied to or impregnated into a sheet material, it exhibits excellent stability over time and uniform penetration.

Embodiments of the present invention are described below. However, the present invention is not limited to 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 are performed under conditions of room temperature (25°C) and a relative humidity of 50% RH.

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 involves adding surfactants, higher alcohols, polymers, etc. to increase the viscosity of the emulsion system. However, this approach raises concerns about the stickiness and other adverse effects of the surfactants and polymers on usability, as well as the reduced penetration sensation caused by 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 an 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.

(Oily based cosmetics)
The oil-based cosmetic of the present invention refers to one in which oil is a continuous phase. As long as oil is a continuous phase, there are no particular limitations on the content, and it may contain an aqueous component 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.

(Component (a) Nonionic surfactant with HLB 8-12)

The nonionic surfactant component (a) with an HLB of 8 to 12 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, a nonionic surfactant selected from the group consisting of polyoxyethylene glycerin fatty acid esters, polyoxyethylene sorbitan fatty acid esters, and polyoxyethylene sorbit fatty acid esters is preferred. 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, etc., 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. Examples of commercially available products of these include "Rheodol TW-O320V" and "Rheodol 430V" (Kao Corporation), and "EMALEX GWIS-108" and "EMALEX GWIS-320" (Nihon Emulsion Co., Ltd.).

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

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, and 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 the content is 5% or more, usability may be reduced, such as unpleasant stickiness occurring after use.

(Component (b) is 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.)

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 (b2) vegetable oils that are liquid at 25°C.

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

Component (b1) of the present invention is an ester oil that is liquid at 25°C and is an ester composed 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.

In the present invention, the fatty acid constituting the ester preferably has a branched structure or a double bond, more preferably has 8 to 22 carbon atoms, and even more preferably has 8 to 18 carbon atoms. 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.

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 stronger penetration 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 emulsion 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.

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

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.

Preferably, the vegetable oil is 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 with 18 carbon atoms. Examples of such vegetable oils include olive oil, macadamia nut oil, rice bran oil, soybean oil, and jojoba oil, with rice bran oil being more preferred. Commercially available products include "Rice Bran Oil" (Oryza Oil & Fat Chemical Co., Ltd.). Furthermore, in the present invention, it is particularly preferable to use a combination of two vegetable oils containing 60% by weight or more of saturated and unsaturated fatty acids with 18 carbon atoms.

Component (b) may be used alone, but using two types in combination is preferable, as this provides even better formulation stability and a more penetrating feel. For example, component (b1) may be used alone or in combination, and component (b2) may be used alone or in combination, but it is more preferable to use component (b1) and component (b2) in combination. Furthermore, in the present invention, it is particularly preferable to contain two or more types of component (b1) and two or more types of component (b2).

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 and penetration sensation, it is preferably 50% or more, and more preferably 60% or more, in the oil-based cosmetic. Furthermore, the content of component (b) in the oil-based cosmetic is preferably 90% or less, and more preferably 80% or less.

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.

The mass ratio of component (a) to component (b) [(b)/(a)] is preferably 10 or greater, and from the viewpoint of ease of use such as non-stickiness, it is more preferably 15 or greater. 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.

(Component (c) Hydrocarbon oil)

Hydrocarbon oils are oils composed only of carbon and hydrogen atoms, and include linear, branched, and volatile hydrocarbon oils. 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.

Among component (c), those with a molecular weight of 200 to 1,000 are preferred from the standpoint of usability, such as a feeling of blockage and lack of stickiness. Examples of those with 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 component. However, in the case of a mixture of components with 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% or more of the mixture contains components whose molecular weights, converted into molecular weights, fall within the range of 200 to 1,000, then the mixture is considered to be a hydrocarbon oil with a molecular weight of 200 to 1,000. 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 component (c) of the present invention. Examples of commercially available products include "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 can be used singly or in combination of two or more types.

In the mix-at-time cosmetic of the present invention, the content of component (c) is not particularly limited, but from the viewpoints of stability over time and ease of use in terms of penetration and occlusion, it is preferable that the content of component (c) in the oil-based cosmetic be 10% or more, and more preferably 30% or more. Furthermore, the content of component (c) in the oil-based cosmetic is preferably 50% or less, and more preferably 45% or less.

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

The mass ratio of components (b) and (c) [(b)/((b)+(c))] is preferably 0.5 or greater, and more preferably 0.6 or greater. 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 greater, and more preferably 0.3 or greater. The mass ratio [(c)/((b)+(c))] is preferably 0.5 or less, and more preferably 0.45 or less. By keeping the mass ratios [(b)/((b)+(c))] and [(c)/((b)+(c))] within these ranges, the formulation stability and usability of the mix-at-time cosmetic composition, including penetration and occlusive feeling, are improved.

In addition to the above components (a) to (c), other additives may be added to the oil-based cosmetic composition 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 added within a range that does not impair the effects of the present invention.

The surfactant may be any surfactant other than component (a) that is commonly used in cosmetics, such as nonionic surfactants, anionic surfactants, cationic surfactants, and amphoteric surfactants.

Emulsifying aids include higher alcohols, monoglyceryl ethers, and monoglyceryl fatty acid esters.

The oil agent is any oil other than components (b) and (c) that is typically used in cosmetics. Examples of such oils include fats and oils, fatty acids, silicone oils, fluorinated oils, and lanolin derivatives, regardless of their origin (e.g., animal oil, synthetic oil) or their nature (e.g., semi-solid oil, liquid oil, volatile oil). 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 fluorinated oils such as perfluorodecane and perfluorooctane.

The powder component can be any powder typically used in cosmetics, and is not particularly limited by its shape (spherical, plate-like, needle-like, etc.), particle size (aerosol, fine particle, pigment-grade, etc.), or particle structure (porous, non-porous, etc.). Examples include inorganic powders, glitter powders, organic powders, pigment powders, metal powders, and composite powders. These may be surface-treated with fluorine compounds, silicone oils, powders, oils, gelling agents, emulsion polymers, surfactants, etc. One or more of these powders can be used, and composites may also be used.

Examples of UV absorbers include benzophenones, PABA, cinnamic acid, and salicylic acid 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.

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.

(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 an oily component such as an oil agent may be included, but is not particularly limited thereto. From the viewpoints of formulation stability, penetration feeling, occlusive feeling, etc., the amount of the oily component is preferably 5% or less, more preferably 1% or less, and even more preferably 0.5% or less.

The water contained in aqueous cosmetics is used as a dispersion medium for oils, and is not particularly limited as long as it is water commonly used in cosmetics. Examples include purified water, distilled water, ion-exchanged water, tap water, hot spring water, and deep-sea water. The water content in the aqueous cosmetic is not particularly limited, but is preferably 30-100%, and more preferably 40-90%.

(Component (d): Polyhydric alcohol)

In the present invention, by further including component (d) polyhydric alcohol, it is possible to improve formulation stability and usability, such as penetration and occlusion.

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 selected and used as needed. Of these, glycerin and 1,3-butylene glycol are preferred.

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

In addition, in the mix-at-time cosmetic, the mass ratio of component (a) to component (d) [(d)/(a)] is preferably 20 or more, and more preferably 40 or more. From the standpoint of formulation stability, the mass ratio [(d)/(a)] is preferably 1500 or less, more preferably 1000 or less, and even more preferably 800 or less. By keeping it within this range, the mix-at-time cosmetic will have good emulsion stability immediately after mixing, stability over time, and usability such as reduced stickiness.

(Component (e): Amino acid)

The present invention can further contain component (e), an amino acid. By including an amino acid in the mix-at-time cosmetic of the present invention, not only does it improve the formulation stability as an emulsion cosmetic, but it also provides a good penetration feeling when applied to the skin.

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, and theanine. Among these, cyclic amino acids are preferred, and hydroxyproline is more preferred.

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

In addition to the components described above, other additives may be added to the aqueous cosmetic composition of the present invention. Examples of other additives include aqueous components such as surfactants, water-soluble polymers, lower alcohols, and moisturizers, as well as preservatives, chelating agents, cosmetic ingredients, oils, and fragrances, as appropriate, provided they do not impair the effects of the present invention.

Examples of water-soluble polymers include carrageenan, xanthan gum, methylcellulose, 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 selected and used as needed.

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 standpoint of ease of use, such as penetration and non-stickiness, it is even more preferably 0.3% or less.

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

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

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. Having the oil-based cosmetic:aqueous cosmetic ratio in this range ensures the formulation stability of the mix-before-use cosmetic. The oil-based cosmetic:aqueous cosmetic ratio is preferably 1:2 to 1:4, and more preferably 1:4.

The mix-at-use 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 achieve the effects of the present invention.

From the perspective of achieving excellent stability over time and a sense of penetration, 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. The particle size of the dispersed droplets here is the value measured by observing the mix-at-time cosmetic 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. This value can be used to calculate the percentage of dispersed droplets with a particle size of 10 μm or more.

The mix-at-time cosmetic of the present invention can be implemented in various forms, including liquid, gel, emulsion, and cream, with a liquid state at 25°C being preferred. In this specification, "liquid at 25°C" means a state that has sufficient fluidity at 25°C. Specifically, this refers to a viscosity of 5,000 mPa·s or less at 25°C, as measured using a Brookfield rotational viscometer.

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.

The pre-mix cosmetic of the present invention can also be used as a topical skin preparation. Examples include topical liquid preparations, gels, creams, ointments, and liniments. The methods of use can be the same as those for the cosmetic preparations described above.

The mix-at-use cosmetic composition of the present invention can be used as a cosmetic composition for a variety of purposes. Examples 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. Of these, skin care cosmetics such as emulsions, creams, serums, massage cosmetics, pack cosmetics, hand creams, body lotions, and body creams are preferred. Examples of usage methods include application to hands, fingers, or cotton, or impregnating a sheet material with the composition. In the present invention, it is more preferred to use a sheet-type cosmetic composition that is applied to or impregnated into a sheet material. Forming the cosmetic composition into a sheet-type cosmetic composition provides sufficient moisture and active ingredients to the skin, resulting in superior moisturizing and emollient effects, as well as a more occlusive feeling after use.

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 selected and used as needed. Of these, cotton and/or rayon are preferred in terms of stability and adhesion to the skin.

The sheet material to be impregnated with the oil-in-water 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, more preferably a thickness of 0.7 to 5 mm and a mass of 10 g or less, from the viewpoint of ease of adhesion during use and ease of peeling. The basis weight of the sheet material used in the present invention is preferably 15 to 300 g/ ^m2 , more preferably 30 to 120 g/ ^m2 , from the viewpoint of adhesion during use and prevention of peeling. Furthermore, the area of one sheet material is preferably 1 to 400 ^cm2 , from the viewpoint of ease of application and ease of peeling when applied to the application site. 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.

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.

In the present invention, it is preferable to fill the bag-shaped container with the sheet material in advance. From the viewpoint of enabling uniform impregnation without unevenness and further enhancing the effects of the present invention, the following configuration is more preferable.

In this bag-shaped container, which includes a first chamber and a second chamber separated by a partition, the first chamber is filled with a water-based cosmetic and a sheet material, and the second chamber is filled with an oil-based cosmetic. During use, the partition separating the first and second chambers is peeled away, allowing the water-based cosmetic and the oil-based cosmetic to mix and be held in the sheet material. The partition between the first and second chambers 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. During use, the partition peels away due to the action of an external force, connecting the first and second chambers, allowing the oil-based cosmetic from the second chamber to be introduced into the first chamber and mixed and emulsified. Examples of external forces include pressure, shear force, and heat.

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

Furthermore, in the present invention, it is preferable that a portion of the bag-shaped container be made of a transparent film so that the mixing state can be easily observed, and it is more preferable that one side (half) of the bag-shaped container be made of a transparent film. The transparent film can be made of PET (polyethylene terephthalate), PE (polyethylene), or the like, but in the present invention, a multilayer film having multiple layers is preferable, and it is more preferable that the innermost film be PE, and a two-layer film 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 ensures good formulation stability and uniform impregnation.

The shape of the bag-shaped container is not particularly limited, but examples include oval, circular, semicircular, heart-shaped, semi-oval, square, and rectangular. In the present invention, square and rectangular shapes are preferred, and the outer dimensions are preferably 10-15 cm x 10-15 cm, and more preferably 16 cm x 14 cm.

(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. For example, it can be produced by uniformly mixing an oil-based cosmetic containing components (a) to (c) and an aqueous cosmetic in a specific weight ratio.

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

Examples 1 to 19 and Comparative Examples 1 to 11: Cosmetics to be mixed before use (milk)
After preparing aqueous and oil-based cosmetics having 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.

Table 1

Table 2-1
Table 2-2

Table 3-1



Table 3-2

Table 4

<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.

(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 was achieved (a cloudy white state). The amounts of the aqueous cosmetic and oil-based cosmetic in the glass bottle were adjusted to the weight ratios shown in Tables 3 and 4.
4-level evaluation criteria (Evaluation): (Evaluation criteria)
◎ : 3 times or less ○ : 5 times or less △ : 10 times or less × : 11 times or more

(Evaluation method 2: Stability over time)
Regarding 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 over time according to the following four-level evaluation criteria.
4-level evaluation criteria (Evaluation): (Evaluation criteria)
◎: 1 hour or more ○: 30 minutes or more △: 10 minutes or more ×: Less than 10 minutes

(Evaluation method 3: Penetration)
Regarding the penetration sensation, 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 penetration sensation upon 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 judgment was made according to the 3-point rating scale below.
Absolute evaluation criteria (score): (evaluation)
5: Very sensitive 4: Slightly sensitive 3: Normal 2: Not very sensitive 1: Not sensitive 3-level rating scale (Rating): (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: Poor

(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 applying each cosmetic to 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 the panelists for each cosmetic, and the score was judged according to the 4-point rating scale below.
Absolute evaluation criteria (score): (evaluation)
5: Very sensitive 4: Slightly sensitive 3: Normal 2: Not very sensitive 1: Not sensitive 4-level rating scale (Rating): (Average score)
◎: 4.5 points or more: extremely good ○: 4 points or more but less than 4.5 points: very good △: 3 points or more but less than 4 points: good ×: 1 point or more but less than 3 points: poor

(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 and scored the stickiness upon use on a 5-point scale using the absolute evaluation below. 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 rating scale below.
Absolute evaluation criteria (score): (evaluation)
5: Not felt 4: Not felt very much 3: Normal 2: Slightly felt 1: Very felt 3-level rating scale (Rating): (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: Poor

Examples 1, 6, 12, and 13 and Comparative Examples 1 and 6: Cosmetic preparations to be mixed before use (milk lotion)
After preparing aqueous and oil-based cosmetics having the compositions shown in Tables 1 and 2, mix-at-use cosmetics were prepared by mixing them in the proportions shown in Table 5. The formulation stability (emulsion stability and stability over time), penetration sensation, occlusive feeling, non-stickiness, and dispersed droplet particle size (proportion of particle sizes of 10 μm or more) were evaluated using the methods described below. The results are also shown in Table 5.

Table 5

(Evaluation method 6): Particle size of dispersed droplets (proportion 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 sizes of 100 dispersed droplets selected randomly per field of view were measured. Using these values, the percentage of dispersed droplets with a particle size of 10 μm or more was calculated.

Examples 1, 5, 6 and Comparative Examples 1, 5: Sheet-form pre-mixed cosmetic preparations After preparing aqueous and oil-based cosmetic preparations with the compositions shown in Tables 1 and 2 below, sheet-form pre-mixed cosmetic preparations 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.

Table 6

(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 (Evaluation): (Evaluation criteria)
○: There is no unevenness in impregnation, and the sheet material is uniformly impregnated with the emulsion. ×: There are uneven or non-uniform impregnation areas.

As is clear from the results in Tables 3 and 4, the pre-use mix-type cosmetics of Examples 1 to 19 of the present invention were superior in terms of penetration, occlusive feeling after use, and lack of stickiness, as well as in formulation stability, compared to the pre-use mix-type cosmetics of Comparative Examples 1 to 10.

In addition, the results in Table 5, which evaluated the particle size of the dispersed droplets (proportion of particles 10 μm or larger), showed that when the proportion of dispersed droplets with a particle size of 10 μm or larger was between 5 and 30%, the product had excellent penetration, a clogging feeling after use, no stickiness, and formulation stability.

Furthermore, as is clear from the results of Table 6, which evaluated the uniformity of impregnation, the sheet-type cosmetics 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 of Comparative Examples 1 and 5.

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 results were not obtained in terms of formulation stability or non-stickiness. Furthermore, in Comparative Examples 3 and 4, in which a nonionic surfactant with a different HLB was used as component (a), satisfactory results were not obtained in terms of formulation stability. Furthermore, in Comparative Example 5, which did not contain component (c) hydrocarbon oil, satisfactory results were not obtained in terms of occlusive feeling. 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 greater than 1:2 (1:1), satisfactory results were not obtained in terms of formulation stability, occlusive feeling, and non-stickiness. Furthermore, in Comparative Examples 8 to 10, in which component (a) was contained in an aqueous cosmetic instead of an oil-based cosmetic, satisfactory results were not obtained in terms of formulation stability. Furthermore, in the case of Comparative Example 11, in which the aqueous cosmetic and oil-based cosmetic were not mixed at the time of use but were prepared using a conventional method for producing emulsion cosmetics, although the product had excellent stability over time, it was not satisfactory in terms of usability, such as the feeling of penetration and occlusion.

Example 20: Oil-in-water emulsion aqueous cosmetic (ingredients) (mass %)
(1) Glycerin (component (d)) 5
(2) Dipropylene glycol (component (d)) 5
(3) 1,3-butylene glycol (component (d)) 5
(4) Xanthan gum 0.5
(5) Purified water remaining amount (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 (component (a)) 3
(12) Jojoba seed oil (component (b2)) 20
(13) Olive fruit oil (component (b2)) 20
(14) Glyceryl triisostearate (component (b1)) 10
(15) Squalane (ingredient (c)) 20
(16) Liquid paraffin (component (c)) balance (17) Phenoxyethanol 1
(18) Fragrance 0.5

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.
C. B was added to A and solubilized to obtain an aqueous cosmetic preparation. The viscosity of the aqueous cosmetic preparation was 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 that are 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.

Example 21: Aqueous hair milk cosmetic (ingredients) (mass%)
(1) Glycerin (component (d)) 5
(2) Propylene glycol (component (d)) 20
(3) Xanthan gum 0.2
(4) Carrageenan 0.1
(5) Purified water remaining amount (6) Sodium monohydrogen phosphate 0.1
(7) Sodium dihydrogen phosphate 0.1
(8) edetate sodium 0.02

Oil-based cosmetics (ingredients) (mass%)
(9) Polyoxyethylene sorbitan trioleate (20 E.O.) (component (a))
1
(10) Cetyl ethylhexanoate (component (b1)) balance (11) Isopropyl myristate (component (b1)) 20
(12) 2-ethylhexyl paramethoxycinnamate 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

Water-based cosmetics (manufacturing method)
Components (1) to (8) were mixed and dissolved uniformly at 25°C to obtain an aqueous cosmetic preparation. The viscosity of the aqueous cosmetic preparation at 25°C was approximately 3,000 mPa·s.
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 that are 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.

Example 22: Aqueous body lotion cosmetic preparation (ingredients) (mass%)
(1) Glycerin (component (d)) 10
(2) Diglycerin (component (d)) 5
(3) Alkyl-modified carboxyvinyl polymer 0.1
(4) Carbomer 0.1
(5) Sodium hydroxide 0.06
(6) Purified water Remaining amount (7) Sodium edetate 0.02

Oil-based cosmetics (ingredients) (mass%)
(8) Sorbeth-30 tetraoleate (component (a)) 0.5
(9) PEG-20 glyceryl triisostearate (component (a)) 0.5
(10) Glyceryl tri-2-ethylhexanoate (component (b1)) 40
(11) Macadamia nut oil (component (b2)) 10
(12) Rice bran oil (component (b2)) 10
(13) α-olefin oligomer (component (c)) balance (14) Vaseline (component (c)) 5
(15) Stearyl alcohol 0.1
(16) Glyceryl stearate 0.1
(17) Phenoxyethanol 1
(18) Fragrance 0.5

Water-based cosmetics (manufacturing method)
Components (1) to (7) were mixed and dissolved uniformly at 25°C to obtain an aqueous cosmetic preparation. The viscosity of the aqueous cosmetic preparation at 25°C was approximately 2,000 mPa·s.
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 that are mixed at the time of use (manufacturing method)
The oil-based cosmetic and the aqueous cosmetic prepared above were uniformly mixed 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 lack of stickiness.

Claims (13)

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 . 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. 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 . 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 . 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 . 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. 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. The mix-at-use cosmetic preparation according to claim 7, characterized in that component (a) contains a fatty acid group consisting of oleic acid and/or isostearic acid. The mix-at-use cosmetic preparation according to any one of claims 1 to 8, wherein 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. 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. The mix-at-use cosmetic according to any one of claims 1 to 10, characterized in that the aqueous cosmetic further contains an amino acid as component (e). 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. 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.