JP2024076141A - Method for producing skin cosmetic - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for stabilizing an oil solution and quickly dispersing it in an aqueous phase in skin cosmetics, which contain the oil solution, a surfactant, glycerol and water.

SOLUTION: Provided is a method for producing skin cosmetics that contain (A) an oil solution, (B) a nonionic surfactant, (C) glycerol, and (D) water. The (A) oil solution is mixed with the (B) surfactant, the (C) glycerol is added to the mixture and dispersed therein, and then the (D) water is add. The present invention enables stable and quick dispersion of the (A) oil solution in the aqueous phase, regardless of its large amount (high concentration).

SELECTED DRAWING: None

COPYRIGHT: (C)2024,JPO&INPIT

Description

The present invention relates to skin cosmetics. In particular, it relates to a method for stably and quickly dispersing a high concentration of oily components in an aqueous phase.

Skin cosmetics are required to have an excellent feel when used and moisturize the skin, as well as other cosmetic effects on the skin. For this reason, various active ingredients are added to skin cosmetics in the hope of achieving cosmetic effects on the skin and increasing the market appeal of the product. Such active ingredients are generally highly oil-soluble (oily ingredients), and it takes ingenuity to disperse them stably and quickly in skin cosmetics, which contain a high proportion of water by weight.

Patent No. 6734562 Patent No. 6726392 JP2020-105077A Japanese Patent No. 6180294 JP2019-131507A

In conventional skin cosmetics containing an oil, a surfactant, glycerin, and water, the stability of the oil cannot be ensured by simply mixing the four components at the same time. In addition, simply adding a mixture of an oil and a surfactant to a mixture of glycerin and water takes time to disperse the mixture of the oil and surfactant uniformly throughout. Therefore, the present invention provides a method for stabilizing the oil and quickly dispersing it in the water phase in skin cosmetics containing an oil, a surfactant, glycerin, and water.

After extensive research into the above-mentioned problems, the inventors discovered a method for producing a skin cosmetic comprising (A) an oil, (B) a nonionic surfactant, (C) glycerin, and (D) water, in which the oil and nonionic surfactant are mixed, (C) glycerin is added and dispersed therein, and then (D) water is added, whereby the (A) component can be dispersed stably and quickly in the aqueous phase, and the present invention has been completed.

That is, the present invention provides a method for producing a skin cosmetic, which can stably and quickly disperse an oily agent (A) in an aqueous phase.
[1] A method for producing a skin cosmetic comprising (A) an oil, (B) a nonionic surfactant, (C) glycerin, and (D) water, the method comprising mixing (A) the oil and (B) the nonionic surfactant, adding and dispersing (C) glycerin thereto, and then adding (D) water.
According to the present invention, even if the oil agent (A) is present in a large amount (high concentration), it can be dispersed stably and quickly in an aqueous phase.
[2] The method according to [1], wherein the component (B) is PRG-13-decyltetradeceth-24.
According to this feature, the effect of stably and quickly dispersing the oil agent (A) in the aqueous phase can be more effectively exhibited.
[3] The method according to [2], wherein the ratio (B/A) of the content of the (B) component to the content of the (A) component is 3 or more.
According to this feature, the effect of stably and quickly dispersing the oil agent (A) in the aqueous phase can be more effectively exhibited.
[4] The manufacturing method according to [3], characterized in that the total content of the (A) component and the (B) component relative to the content of the (C) component ((A+B)/C) is 0.8 or less.
According to this feature, the effect of stably and quickly dispersing the oil agent (A) in the aqueous phase can be more effectively exhibited, and the effect of quickly dispersing a mixture of the oil agent (A) and the surfactant (B) in the aqueous phase can also be effectively exhibited.

The present invention provides a method for producing a skin cosmetic that contains an oil, a nonionic surfactant, glycerin, and water, and that can stabilize the oil and quickly disperse it in the aqueous phase.

Hereinafter, an embodiment of the method for producing a skin cosmetic according to the present invention will be described in detail.
It should be noted that the method for producing a skin cosmetic described in this embodiment is merely an example for the purpose of explaining the present invention, and the present invention is not limited thereto.

((A) Oil agent)
An oil is an oil-soluble component that spreads smoothly on the surface of the skin and does not allow moisture to evaporate from the skin. It is also called an emollient. The oil used in the present invention is not particularly limited as long as it is an oil that can be normally blended in cosmetics, and examples thereof include fats and oils, essential oils, silicone oils, waxes, hydrocarbons, higher alcohols, higher fatty acids, esters, fluorine oils, alkyl glyceryl ethers and their fatty acid esters, phospholipids, etc. These may be contained alone or in combination.

Fats and oils are a type of lipid and refer to ester compounds of naturally occurring fatty acids and glycerin. Examples of fats and oils include liquid fats and oils such as avocado oil, camellia oil, evening primrose oil, turtle oil, macadamia nut oil, corn oil, mink oil, olive oil, rapeseed oil, egg yolk oil, sesame oil, persic oil, wheat germ oil, sasanqua oil, castor oil, linseed oil, safflower oil, cottonseed oil, perilla oil, soybean oil, peanut oil, tea seed oil, kaya oil, rice bran oil, Chinese tung oil, Japanese tung oil, jojoba oil, germ oil, triglycerin, glycerin trioctanoate, and glycerin triisopalmitate; and solid fats and oils such as cacao butter, coconut oil, horse fat, hardened coconut oil, palm oil, beef tallow, mutton tallow, hardened beef tallow, palm kernel oil, lard, beef bone fat, Japan wax kernel oil, hardened oil, beef leg fat, Japan wax, and hardened castor oil.

Essential oils include tea tree oil, cedar oil, Japanese cypress oil, cypress oil, eucalyptus oil, lavender oil, jasmine oil, rose oil, lemon oil, orange oil, etc.

Silicone oil is a synthetic polymer in which silicon with an organic group and oxygen are alternately linked by chemical bonds. Silicone oil may be linear or branched. Examples include dimethylpolysiloxane (INCI name: dimethicone), dimethylpolysiloxane with hydroxyl end groups (INCI name: dimethiconol), methylphenylpolysiloxane, decamethylcyclopentasiloxane, dodecamethylcyclohexasiloxane, polyether-modified silicone (polyalkylene glycol-modified silicone, etc.), highly polymerized silicone with an average degree of polymerization of 650 to 10,000, amino-modified silicone, betaine-modified silicone, alkyl-modified silicone, alkoxy-modified silicone, mercapto-modified silicone, carboxy-modified silicone, and fluorine-modified silicone.
Examples of the amino-modified silicone include aminopropylmethylsiloxane-dimethylsiloxane copolymer (INCI name: aminopropyl dimethicone), aminoethylaminopropylsiloxane-dimethylsiloxane copolymer (INCI name: amodimethicone), aminoethylaminopropylmethylsiloxane-dimethylsiloxane copolymer (INCI name: trimethylsilylamodimethicone), and the like.

Waxes are ester compounds of higher fatty acids and higher alcohols. Examples of waxes include candelilla wax, carnauba wax, jojoba oil, beeswax, and lanolin wax.

Hydrocarbons are compounds consisting of carbon and hydrogen. Examples include liquid paraffin, paraffin, microcrystalline wax, petrolatum, isoparaffins, ozokerite, ceresin, polyethylene, α-olefin oligomer, polybutene, synthetic squalane, squalene, hydrogenated squalane, limonene, and turpentine.

The higher alcohol is a monohydric alcohol having 6 or more carbon atoms (C ₆ ). Examples of higher alcohols include cetyl alcohol (cetanol), stearyl alcohol, cetostearyl alcohol, oleyl alcohol, linoleyl alcohol, linolenyl alcohol, arachyl alcohol, behenyl alcohol, lauryl alcohol, myristyl alcohol, 2-hexyldecanol, isostearyl alcohol, 2-octyldodecanol, decyltetradecanol, phytosterol, phytostanol, cholesterol, cholestanol, lanosterol, and ergosterol.

Higher fatty acids are fatty acids having 12 or more carbon atoms (C ₁₂ ). Examples of higher fatty acids include lauric acid, myristic acid, palmitic acid, stearic acid, behenic acid, isostearic acid, hydroxystearic acid, 12-hydroxystearic acid, oleic acid, undecylenic acid, linoleic acid, ricinoleic acid, and lanolin fatty acid.

Esters are compounds obtained by the dehydration reaction of fatty acids with alcohols. Examples include diisopropyl adipate, 2-hexyldecyl adipate, isopropyl myristate, myristyl myristate, cetyl octanoate, cetyl isooctanoate, isononyl isononanoate, diisopropyl sebacate, isopropyl palmitate, 2-ethylhexyl palmitate, cetyl ethylhexanoate, butyl stearate, isocetyl isostearate, hexyl laurate, decyl oleate, fatty acids (C10-30) (cholesteryl/lanosteryl), lauryl lactate, octyldodecyl lactate, lanolin acetate, dipentaerythritol fatty acid esters, N-alkyl glycol monoisostearate, and lanolin derivatives.

Phospholipids are lipids that have a phosphate ester moiety in their structure. Phospholipids are amphiphilic and form lipid bilayers, and are a major component of cell membranes along with glycolipids and cholesterol. They are also said to be involved in signal transduction in vivo. Phospholipids or phospholipid derivatives are not particularly limited, but examples include glycerophospholipids and sphingophospholipids. Specific examples include lecithin, phosphatidylethanolamine, phosphatidic acid, lysophosphatidic acid, sphingomyelin, phosphatidylinositol, and hydrogenated lecithin.

The content of the oil agent (A) in the present invention is not particularly limited, but is preferably 0.01 to 1.0% by mass based on the entire skin cosmetic as long as the effects of the present invention are exhibited. The lower limit of the content is more preferably 0.03% by mass or more, and even more preferably 0.05% by mass or more. The upper limit of the content is more preferably 0.5% by mass or less, even more preferably 0.3% by mass or less, and even more preferably 0.1% by mass or less. If it is 0.1% by mass or more, sufficient skin moisturizing effect and deep wrinkle improvement effect can be obtained. On the other hand, if it is 1.0% by mass or less, stickiness and the generation of precipitates over time of the skin cosmetic are unlikely to occur. Here, when two or more types of oil agent (A) are included, the above content indicates the total amount of those components.

((B) Nonionic Surfactant)
A nonionic surfactant is a surfactant having a hydrophilic group such as a hydroxyl group or an ether bond that does not dissociate into ions in an aqueous solution. Examples of nonionic surfactants include POE alkyl ethers, POE alkyl phenyl ethers, POE-POP alkyl ethers, POE sorbitan fatty acid esters, POE mono fatty acid esters, POE glycerin fatty acid esters, polyglycerin fatty acid esters, monoglycerin fatty acid esters, sorbitan fatty acid esters, sucrose fatty acid esters, and alkyl polyglucosides. Specific examples of POE alkyl ethers include POE lauryl ether, POE cetyl ether, POE stearyl ether, POE behenyl ether, POE lanolin, and POE phytosterol.
As the surfactant (B) in the present invention, POE alkyl ethers, POE alkyl phenyl ethers, and POE.POP alkyl ethers are preferred, and PRG-13-decyltetradeceth-24 is more preferred.
The nonionic surfactant may be contained alone or in combination of two or more kinds.

PRG-13-Decyltetradeceth-24 is obtained by addition polymerization of ethylene oxide and propylene oxide to decyltetradecanol, and is represented by the following formula 1. In the following formula 1, n is an average of 24, and m is an average of 13.

The HLB value of the surfactant (B) is not particularly limited, but as long as the effects of the present invention are exhibited, it is preferable that the HLB value is 10 or more and 15 or less. In the present invention, the HLB value (hydrophilic-lipophilic balance) is calculated by Griffin's formula (J. Soc. Cosmet. Chem., 1, 311 (1949); 5, 249 (1953)). The HLB value of a mixed surfactant consisting of two or more types of surfactants (hereinafter referred to as mixed HLB) is a weighted average of the HLB values of each surfactant based on their blending ratio, and is calculated by the following formula.
Mixed HLB value = Σ(HLBx × Wx) / ΣWx
(HLBx represents the HLB value of surfactant X. Wx represents the mass (g) of surfactant X having the HLBx value.)

The content of the surfactant (B) in the present invention is not particularly limited, but is preferably 0.05 to 1 mass% based on the entire skin cosmetic as long as the effects of the present invention are exhibited. The lower limit of the content is more preferably 0.1 mass% or more. The upper limit of the content is more preferably 0.5 mass% or less, and even more preferably 0.3 mass% or less.

In the present invention, the ratio (B/A) of the content of the surfactant (B) to the content of the oil agent (A) is not particularly limited, but from the viewpoint of the effect of the stability and rapid dispersibility of the oil agent (A) in the aqueous phase, it is preferably 3 or more, and more preferably 4 or more.

((C) Glycerin)
Glycerin is a type of trihydric alcohol. It is highly soluble in water, is a colorless, transparent, molasses-like liquid, has a sweet taste, and is used as a moisturizer and lubricant.

The content of (C) glycerin in the present invention is not particularly limited, but is preferably 0.05 to 10% by mass based on the entire skin cosmetic as long as the effects of the present invention are exhibited. The lower limit of the content is more preferably 0.1% by mass or more, and even more preferably 0.5% by mass or more. The upper limit of the content is more preferably 7% by mass or less, even more preferably 5% by mass or less, and even more preferably 1.0% by mass or less. When the content of (C) glycerin is 1.0% by mass or less, there is an effect of improving the feel.

In the present invention, the total content of the (A) oil agent and the (B) surfactant relative to the content of the (C) glycerin ((A+B)/C) is not particularly limited, but from the viewpoint of exhibiting stability and rapid dispersibility of the (A) oil agent in the aqueous phase, it is preferably 2.0 or less, and more preferably 0.8 or less.

((D) Water)
Water is a compound represented by the chemical formula H ₂ O. Water is the most widely used solvent for dissolving various water-soluble substances, and is also the most widely used water-soluble base from the viewpoints of its ability to dissolve water-soluble substances and its safety and stability. The type of water in the present invention is not particularly limited, and examples thereof include tap water, pure water, distilled water, RO water, ion-exchanged water, purified water, deep sea water, and natural deep sea water.

The content of (D) water in the present invention is not particularly limited, but is preferably 80 to 97% by mass based on the entire skin cosmetic as long as the effects of the present invention are exhibited. If it is 80% by mass or more, it is easy to adjust the content of components other than water, and if it is 97% by mass or less, it is easy to exhibit the effects of stability and quick dispersibility of (A) oil in the aqueous phase.

(Other ingredients)
In addition to the components described above, the skin cosmetic produced by the production method of the present invention can contain other components, such as surfactants other than component (B), thickeners, powders (colorants, resins, pigments), preservatives, fragrances, moisturizers, physiologically active ingredients, mineral salts, solvents, antioxidants, chelating agents, pearlizing agents, neutralizing agents, pH adjusters, plant extracts, enzymes, vitamins, amino acids, and the like, as appropriate, within the scope of the object of the present invention.

Examples of surfactants other than component (B) include cationic surfactants, anionic surfactants, and zwitterionic surfactants. The surfactants other than component (B) used in the present invention are not particularly limited as long as they are surfactants that can be normally incorporated into cosmetics. These surfactants may be contained alone or in combination with two or more types.

A cationic surfactant is a surfactant in which the hydrophilic group carries a positive charge when ionized in an aqueous solution. Examples of cationic surfactants include alkyl quaternary ammonium salts such as monoalkyl quaternary ammonium salts, dialkyl quaternary ammonium salts, trialkyl quaternary ammonium salts, benzalkonium quaternary ammonium salts, and monoalkyl ether quaternary ammonium salts; amine salts such as alkylamine salts, fatty acid amide amine salts, ester-containing tertiary amine salts, and arcobell-type tertiary amine salts; cyclic quaternary ammonium salts such as alkylpyridinium salts and alkylisoquinolium salts; and benzethonium chloride.

Examples of monoalkyl quaternary ammonium salts include lauryl trimethyl ammonium chloride, lauryl trimethyl ammonium bromide, alkyl (16,18) trimethyl ammonium chloride, cetyl trimethyl ammonium chloride, cetyl trimethyl ammonium bromide, cetyl trimethyl ammonium saccharin, stearyl trimethyl ammonium chloride, stearyl trimethyl ammonium bromide, behenyl trimethyl ammonium chloride, stearyl trimethyl ammonium saccharin, alkyl (28) trimethyl ammonium chloride, diPOE (2) oleyl methyl ammonium chloride, diPOE stearyl methyl ammonium chloride, POE (1) POP (25) diethyl methyl ammonium chloride, POP methyl diethyl ammonium chloride, methacryloyloxyethyl trimethyl ammonium chloride, and behenyl trimethyl ammonium methyl sulfate. Particularly preferred are stearyl trimethyl ammonium chloride, alkyl (16,18) trimethyl ammonium chloride, and cetyl trimethyl ammonium chloride.

An anionic surfactant is a surfactant in which the hydrophilic group carries a negative charge when ionized in an aqueous solution. Examples of anionic surfactants include alkyl ether sulfates, POE alkyl ether sulfates, alkyl sulfates, alkenyl ether sulfates, alkenyl sulfates, olefin sulfonates, alkanesulfonates, saturated or unsaturated fatty acid salts, alkyl or alkenyl ether carboxylates, α-sulfonic acid salts, N-acylamino acid surfactants, mono- or diester phosphate surfactants, and sulfosuccinate esters. The counter ion of the anionic group of these surfactants may be, for example, any of sodium ions, potassium ions, and triethanolamine.

More specifically, disodium lauryl sulfosuccinate, sodium lauryl sulfate, sodium myristyl sulfate, potassium lauryl sulfate, ammonium lauryl sulfate, triethanolamine lauryl sulfate, sodium cetyl sulfate, sodium stearyl sulfate, sodium POE lauryl ether sulfate, triethanolamine POE lauryl ether sulfate, ammonium POE lauryl ether sulfate, sodium POE stearyl ether sulfate, disodium lauryl sulfosuccinate, sodium stearoyl methyl taurine, triethanolamine dodecylbenzenesulfonate, sodium tetradecenesulfonate, sodium lauryl phosphate, POE lauryl ether phosphate and its salts, N-lauroyl glutamate salts (such as sodium lauroyl glutamate), N-lauroyl methyl-β-alanine salts, N-acyl glycine salts, N-acyl glutamate salts, higher fatty acids lauric acid and myristic acid, and salts of these higher fatty acids can be mentioned, and one or more of them can be used alone.

An amphoteric surfactant is a surfactant whose hydrophilic group in the molecule has both a cationic group and an anionic group. Examples of amphoteric surfactants include amino acid-type amphoteric surfactants and betaine-type amphoteric surfactants.

Specific examples of amino acid type amphoteric surfactants include glycine type amphoteric surfactants such as sodium N-lauroyl-N'-carboxymethyl-N'-hydroxyethylethylenediamine (sodium lauroamphoacetate), 2-alkyl-N-carboxymethyl-N-hydroxyethylimidazolinium betaine, sodium undecylhydroxyethylimidazolinium betaine, alkyldiaminoethylglycine hydrochloride, sodium N-coconut oil fatty acid acyl-N'-carboxyethyl-N'-hydroxyethylethylenediamine, disodium N-coconut oil fatty acid acyl-N'-carboxyethoxyethyl-N'-carboxyethylethylenediamine, disodium N-coconut oil fatty acid acyl-N'-carboxymethoxyethyl-N'-carboxymethylethylenediamine, sodium lauryldiaminoethylglycine, and sodium palm oil fatty acid acyl-N-carboxyethyl-N-hydroxyethylethylenediamine, as well as aminopropionic acid type amphoteric surfactants such as sodium laurylaminopropionate, sodium laurylaminodipropionate, and triethanolamine laurylaminopropionate.

Specific examples of betaine-type amphoteric surfactants include aminoacetic acid betaine-type amphoteric surfactants such as coconut oil alkyl betaine, lauryl dimethylaminoacetate betaine, myristyl dimethylaminoacetate betaine, stearyl dimethylaminoacetate betaine, sodium stearyl dimethyl betaine, coconut oil fatty acid amidopropyl betaine, palm oil fatty acid amidopropyl betaine, lauric acid amidopropyl betaine, ricinoleic acid amidopropyl betaine, and stearyl dihydroxyethyl betaine, as well as sulfobetaine-type amphoteric surfactants such as lauryl hydroxysulfobetaine.

Furthermore, physiologically active ingredients can be appropriately blended within the scope of the present invention without impairing the object of the present invention. A physiologically active substance is a substance that imparts some physiological activity to the skin when applied to the skin, and examples include whitening agents, anti-inflammatory agents, anti-aging agents, UV protection agents, astringents, antioxidants, blood circulation promoters, antibacterial agents, germicides, cooling agents, warming agents, wound healing promoters, irritation relief agents, analgesics, cell activators, etc.

The following provides examples of the manufacturing method of the present invention and further explains the present invention in detail, but the present invention is not limited to these examples.

(Mixing method 1)
According to the formulations in Tables 1 to 5, the skin cosmetics according to the examples in Tables 1 to 5 and the skin cosmetics according to the comparative example in Table 1 were prepared by the following mixing method.
The raw materials shown in Tables 1 to 5 were mixed with (A) oil and (B) surfactant at room temperature (25°C), and then (C) glycerin was mixed. (The mixture of (A), (B), and (C) was designated as the first phase.) The method of subsequently mixing (D) water (second phase) into the first phase was designated as mixing method 1. The components were mixed by stirring using a mixer (TK Homomixer, manufactured by Primix Corporation).

In Examples 2 to 4, (C) glycerin mixed with (D1) water was mixed with a mixture of (A) oil and (B) surfactant (the mixture of (A) and (B) and the mixture of (C) and (D1) were mixed together to form the first phase). The method of subsequently mixing (D) water (second phase) with the first phase was defined as mixing method 1. The components were mixed by stirring using a mixer (TK Homomixer, manufactured by Primix Corporation).

(Mixing method 2)
According to the formulation in Table 1, the skin cosmetic composition according to the comparative example in Table 1 was prepared by the following mixing method.
The raw materials shown in Table 1 were mixed with (A) oil and (B) surfactant under room temperature (25° C.) conditions to form a first phase, and (C) glycerin and (D) water to form a second phase, and a method of mixing the first and second phases was described as mixing method 2. The components were mixed by stirring using a mixer (TK Homomixer, manufactured by Primix Corporation).

(Evaluation of Dispersibility)
After mixing by the above mixing method 1 or 2, the dispersibility was evaluated by visual observation based on the following criteria.

(Evaluation criteria)
5: Disperses and mixes extremely quickly.
4: Quickly disperses and mixes.
3: Dispersible and mixable.
2: Somewhat difficult to disperse and mix.
1: Difficult to disperse and mix, or dispersive mixing is not possible.

(Stability Evaluation)
The skin cosmetics of the Examples and Comparative Examples of the present invention were filled into glass bottles of 50 g each and stored for three months in incubators at 45° C., 30° C., and 0° C. After three months, the skin cosmetics of the Examples and Comparative Examples of the present invention were removed and their condition was confirmed. The stability of the skin cosmetics was evaluated using the following items and classified as follows:

(Stability evaluation criteria)
5: Very good (almost no change observed at 45°C, 30°C, or 0°C)
4: Good (Very slight discoloration or odor was observed at 45°C, 30°C, or 0°C, but there was no problem with the quality of the skin cosmetic product)
3: Normal (At 45°C, 30°C, and 0°C, some discoloration, odor, and/or unevenness was observed, but there is no problem with the quality of the skin cosmetic product)
2: Fairly bad (at 45°C, 30°C, and 0°C, significant discoloration, odor change, and/or unevenness were observed)
1: Poor (At 45°C, 30°C, and 0°C, one or more of the following were observed: precipitation of crystalline particles, separation of oil or water, significant discoloration, odor change, and/or inhomogeneity)

(Evaluation of usability (non-stickiness))
A sensory evaluation was carried out by five expert panelists on the stickiness of the skin immediately after use of the skin cosmetic compositions according to the examples of the present invention, using the following scoring system. The evaluation criteria were classified as follows, using the average scores of the five panelists.

(Rating criteria for non-stickiness)
5: Does not feel sticky.
4: Feels slightly sticky.
3: Feels slightly sticky.
2: Feels sticky.
1: Very sticky and uncomfortable.

As shown in Table 1, the example (mixing method 1) prepared by the manufacturing method of the present invention showed good results in both dispersibility and stability. On the other hand, comparative examples 1 and 2 prepared by mixing method (2), which is not the manufacturing method of the present invention, showed poor results in both dispersibility and stability.

As shown in Tables 2 to 4, the examples prepared using the manufacturing method according to the present invention (mixing method 1) showed good results in terms of both dispersibility and stability. On the other hand, as shown in Table 2, the stability was poor in Comparative Examples 3 and 4, which used a component other than glycerin as component (C).

The skin cosmetic produced by the production method of the present invention is suitable for use as a skin lotion or skin toner.

Claims (4)

A method for producing a skin cosmetic comprising (A) an oil, (B) a nonionic surfactant, (C) glycerin, and (D) water, the method comprising mixing (A) the oil with (B) the surfactant, adding and dispersing (C) glycerin thereto, and then adding (D) water. The method according to claim 1, characterized in that the component (B) is PRG-13-decyltetradeceth-24. The manufacturing method according to claim 2, characterized in that the ratio (B/A) of the content of the (B) component to the content of the (A) component is 3 or more. 4. The method according to claim 3, wherein a value ((A+B)/C) of the total content of the component (A) and the component (B) relative to the content of the component (C) is 0.8 or less.