JP7555683B2 - Emulsion cosmetic composition - Google Patents

Description

The present invention relates to an emulsion cosmetic composition.

It is generally known that lower alcohols with 1 to 3 carbon atoms, such as ethanol and isopropyl alcohol, have a bactericidal effect against bacteria and viruses, and liquid disinfectants containing lower alcohols are widely used. However, such liquid disinfectants have the problem that they run off and drip when applied to the area to be disinfected, such as the palm of the hand. Spray-type disinfectants have the problem of diffusing into the air. Furthermore, the use of disinfectants containing high concentrations of lower alcohols may cause rough hands.

Patent Documents 1 and 2 disclose disinfectant compositions that contain 20% or more by mass of a lower alcohol having 1 to 3 carbon atoms and a disinfectant, and that have a bactericidal effect as well as moisturizing properties.

JP 2017-132711 A JP 2018-158890 A

The disinfectant compositions disclosed in Patent Documents 1 and 2 have a superior feel when used and suppress dripping compared to liquid germicides containing a high concentration of lower alcohol. However, compared to conventional emulsion cosmetic compositions such as hand creams, they are very sticky and have insufficient moisturizing properties, which causes problems with the feel when used. Furthermore, although the above disinfectant compositions suppress dripping, they tend to slide down while maintaining a gel-like form, leaving room for improvement in terms of suppressing dripping. Furthermore, when a high content of lower alcohol is used, there is also the problem of a strong alcohol odor.

The object of the present invention is therefore to provide an emulsified cosmetic composition that is excellent in bactericidal activity, non-stickiness, moisturizing feel, and low alcohol odor, and that suppresses dripping.

As a result of intensive research conducted by the present inventors to achieve the above object, they have found that an emulsion cosmetic composition containing component (A): a lower alcohol, component (B): a dihydric alcohol and/or trihydric alcohol, component (C): a thickener, component (D): a nonionic surfactant containing a polyglycerol fatty acid ester and having an HLB value of 8.0 to 15.0, component (E): a bactericidal component, and component (F): sodium edetate, and in which the content ratios of components (A) and (B) are each within a specific range, exhibits excellent bactericidal action, non-stickiness, moisturizing feel, and low-alcohol odor, and suppresses dripping. The present invention has been completed based on these findings.

That is, the present invention comprises the following components (A), (B), (C), (D), (E), and (F):
The present invention provides an emulsion cosmetic composition having a content ratio of component (A) of 8.0 to 25.0 mass % and a content ratio of component (B) of 8.0 to 18.0 mass %.
Component (A): Lower alcohol Component (B): Dihydric alcohol and/or trihydric alcohol Component (C): Thickener Component (D): Nonionic surfactant containing polyglycerol fatty acid ester and having an HLB value of 8.0 to 15.0 Component (E): Bactericidal component Component (F): Sodium edetate

The content of polyglycerol fatty acid ester is preferably 2.0 to 8.0% by mass.

The emulsion cosmetic composition of the present invention has excellent bactericidal activity, non-stickiness, moisturizing properties, and a low alcohol odor, and is less likely to drip when applied to a sterilized area. Therefore, the emulsion cosmetic composition of the present invention has excellent stability and excellent usability.

The emulsion cosmetic composition of the present invention contains at least a lower alcohol, a dihydric alcohol and/or a trihydric alcohol, a thickener, a nonionic surfactant, a bactericidal component, and sodium edetate. The nonionic surfactant contains a polyglycerol fatty acid ester and has an HLB value of 8.0 to 15.0. In this specification, the lower alcohol may be referred to as "component (A)", the dihydric alcohol and/or trihydric alcohol as "component (B)", the thickener as "component (C)", the nonionic surfactant containing a polyglycerol fatty acid ester and having an HLB value of 8.0 to 15.0 as "component (D)", the bactericidal component as "component (E)", and sodium edetate as "component (F)".

That is, the emulsion cosmetic composition of the present invention contains at least component (A), component (B), component (C), component (D), component (E), and component (F). The emulsion cosmetic composition of the present invention may contain components other than the above-mentioned components (A) to (F). Furthermore, each component contained in the emulsion cosmetic composition of the present invention, for example, components (A) to (F) and other components, may be used alone or in combination of two or more.

[Component (A)]
Component (A) is a lower alcohol. Component (A) is a monohydric lower alcohol, and exhibits a bactericidal effect in the emulsion cosmetic composition. Component (A) may be used alone or in combination of two or more kinds.

Component (A) includes monohydric alcohols having 1 to 4 carbon atoms, such as methanol, ethanol, 1-propyl alcohol, 2-propyl alcohol, and 1-butanol.

The content of component (A) in the emulsion cosmetic composition of the present invention is 8.0 to 25.0% by mass, preferably 11.0 to 22.0% by mass, and more preferably 12.0 to 18.0% by mass, relative to 100% by mass of the emulsion cosmetic composition of the present invention. When the content is 8.0% by mass or more, the antibacterial effect is excellent. When the content is 25.0% by mass or less, the alcohol odor is suppressed, the moisturizing feeling is excellent, and the stability of the emulsion cosmetic composition is excellent. The content of component (A) is the total content of all components (A) in the emulsion cosmetic composition of the present invention.

[Component (B)]
Component (B) is a dihydric alcohol and/or a trihydric alcohol. The emulsion cosmetic composition of the present invention exhibits excellent bactericidal action by containing component (B) together with component (A). Only one type of component (B) may be used, or two or more types may be used.

Examples of the dihydric alcohol include (poly)alkylene glycols such as ethylene glycol, diethylene glycol, triethylene glycol, propylene glycol, dipropylene glycol, isoprene glycol, 1,2-butylene glycol, 1,3-butylene glycol, 1,2-pentanediol, 1,2-hexanediol, 1,2-octanediol, 1,2-decanediol, 1,2-dodecanediol, polyethylene glycol, and polypropylene glycol. Among these, dihydric alcohols having 2 to 12 carbon atoms are preferred, and 1,3-butylene glycol and dipropylene glycol are more preferred. An example of the trihydric alcohol is glycerin.

As component (B), only dihydric alcohols, only trihydric alcohols, or a combination of dihydric alcohols and trihydric alcohols can be used. When a combination of dihydric alcohols and trihydric alcohols is used, the emulsion cosmetic composition of the present invention exhibits a more excellent bactericidal effect.

The content of component (B) in the emulsion cosmetic composition of the present invention is 8.0 to 18.0% by mass, preferably 9.0 to 17.0% by mass, and more preferably 10.0 to 16.0% by mass, relative to 100% by mass of the emulsion cosmetic composition of the present invention. When the content is 8.0% by mass or more, the composition has excellent bactericidal action and moisturizing feeling. When the content is 18.0% by mass or less, the composition is excellent in non-stickiness. The content of component (B) is the total content of all components (B) in the emulsion cosmetic composition of the present invention.

The content of the dihydric alcohol in the emulsion cosmetic composition of the present invention is not particularly limited, but is preferably 2.0 to 18.0% by mass, more preferably 5.0 to 17.0% by mass, and even more preferably 10.0 to 15.0% by mass, relative to 100% by mass of the emulsion cosmetic composition of the present invention. When the content is 2.0% by mass or more, the bactericidal action and moisturizing feeling are even more excellent. When the content is 18.0% by mass or less, the lack of stickiness is even more excellent. The content of the dihydric alcohol is the total content of all dihydric alcohols in the emulsion cosmetic composition of the present invention.

The content of the trihydric alcohol in the emulsion cosmetic composition of the present invention is not particularly limited, but is preferably 0.5 to 15.0% by mass, more preferably 1.0 to 13.0% by mass, and even more preferably 2.0 to 10.0% by mass, relative to 100% by mass of the emulsion cosmetic composition of the present invention. When the content is 0.5% by mass or more, the bactericidal effect and moisturizing feeling are even better. When the content is 15.0% by mass or less, the lack of stickiness is even better, and the stability of the emulsion cosmetic composition is also even better. The content of the trihydric alcohol is the total content of all trihydric alcohols in the emulsion cosmetic composition of the present invention.

[Component (C)]
Component (C) is a thickener. By blending component (C), dripping when applied to a sterilized site can be suppressed, and the emulsion cosmetic composition has excellent stability. Component (C) may be used alone or in combination of two or more.

Component (C) may be, for example, a water-soluble thickener such as a natural polymer, semi-synthetic polymer, or synthetic polymer that is water-soluble. Examples of the water-soluble natural polymer include gum arabic, tragacanth gum, xanthan gum, guar gum, locust bean gum, karaya gum, iris moss, quince seed, gelatin, shellac, rosin, casein, carrageenan, and pectin. Examples of the water-soluble semi-synthetic polymer include cellulose-based thickeners such as carboxymethylcellulose, sodium carboxymethylcellulose, hydroxymethylcellulose, hydroxyethylcellulose, methylcellulose, ethylcellulose, sodium alginate, ester gum, nitrocellulose, hydroxypropylcellulose, hydroxypropylmethylcellulose, and crystalline cellulose. Examples of the water-soluble synthetic polymers include polyvinyl alcohol, carboxyvinyl polymers, polyvinyl methyl cellulose, polyamide resins, polyethylene glycols, sodium polyacrylate, acrylic acid/methacrylic acid ester copolymers (alkyl-modified carboxyvinyl polymers), acrylic thickeners such as (acrylates/steareth-20 methacrylate) copolymers, (acrylates/steareth-20 methacrylate) crosspolymers, (acrylates/beheneth-25 methacrylate) copolymers, and (acrylates/vinyl neodecanoate) crosspolymers. Among these, water-soluble semi-synthetic polymers and water-soluble synthetic polymers are preferred, and cellulose-based thickeners and carboxyvinyl polymers are more preferred.

When a carboxyvinyl polymer or an acrylic acid/methacrylic acid ester copolymer is used as a thickener, it is usually neutralized with a basic substance before use. Examples of basic substances include alkanolamines such as triethanolamine and monoethanolamine; inorganic bases such as ammonia, sodium hydroxide, and potassium hydroxide; and basic amino acids such as arginine. The amount of basic substance added is an amount sufficient to neutralize the carboxyvinyl polymer or the acrylic acid/methacrylic acid ester copolymer, and may be appropriately blended depending on the type and amount of these components used.

The content of component (C) in the emulsion cosmetic composition of the present invention is not particularly limited, but is preferably 0.05 to 0.8% by mass, and more preferably 0.1 to 0.5% by mass, relative to 100% by mass of the emulsion cosmetic composition of the present invention. If the content is 0.05% by mass or more, dripping upon application to a sterilized site can be further suppressed, and the emulsion cosmetic composition has better stability. If the content is 0.8% by mass or less, the emulsion cosmetic composition has better lack of stickiness. The content of component (C) is the total content of all components (C) in the emulsion cosmetic composition of the present invention.

[Component (D)]
Component (D) is a nonionic surfactant containing a polyglycerol fatty acid ester and having an HLB value of 8.0 to 15.0. By using such component (D), even when components (A) and (B) are contained in the above-mentioned content ratio, dripping can be suppressed when applied to a sterilized site, and the emulsion cosmetic composition has excellent stability. Component (D) may contain only one type of nonionic surfactant, or may contain two or more types.

The HLB value of component (D) is 8.0 to 15.0, preferably 9.0 to 13.0. By having the HLB value within the above range, even when components (A) and (B) are contained in the above-mentioned content ratio, dripping can be suppressed when applied to a sterilized site, and the emulsion cosmetic composition has excellent stability. The above HLB value refers to the HLB (hydrophile-lipophile balance) value of all nonionic surfactants in the emulsion cosmetic composition of the present invention, and the HLB value of each nonionic surfactant may be outside the above range. The HLB value of each nonionic surfactant can be calculated by the Griffin method. The HLB value of the entire nonionic surfactant is calculated according to the mass ratio in the nonionic surfactant. For example, if x parts by mass of a nonionic surfactant with an HLB value of a and y parts by mass of a nonionic surfactant with an HLB value of b are used, the HLB value of the entire nonionic surfactant is calculated as a x / (x + y) + b x y / (x + y).

Component (D) contains at least a polyglycerol fatty acid ester. Examples of the polyglycerol fatty acid ester include diglyceryl monocaprylate, decaglyceryl monocaprylate, hexaglyceryl monocaprate, tetraglyceryl monolaurate, hexaglyceryl monolaurate, decaglyceryl monolaurate, poly(4-10)glyceryl monolaurate, decaglyceryl monomyristate, decaglyceryl monostearate, decaglyceryl monoisostearate, and poly(2-10)glyceryl monostearate. Examples of such fatty acid esters include polyglycerol fatty acid esters with a degree of polymerization of 2 to 10, such as diglyceryl monooleate, poly(2-10)glyceryl monooleate, hexaglyceryl monooleate, diglyceryl sesquioleate, poly(2-10)glyceryl diisostearate, decaglyceryl distearate, poly(6-10)glyceryl distearate, diglyceryl triisostearate, and poly(10)glyceryl tristearate.

The polyglycerol fatty acid ester may be an alkylene oxide adduct of a polyglycerol fatty acid ester. Examples of the alkylene oxide adduct of a polyglycerol fatty acid ester include polyoxyethylene glyceryl monostearate and polyoxyethylene glyceryl monooleate. Only one type of the polyglycerol fatty acid ester may be used, or two or more types may be used.

Among the above polyglycerol fatty acid esters and their alkylene oxide adducts, those having an HLB value (HLB value of each compound alone) within the above range are preferred.

Component (D) may contain other nonionic surfactants in addition to polyglycerin fatty acid esters. Examples of the other nonionic surfactants include sorbitan fatty acid esters, monoglycerin fatty acid esters, and their alkylene oxide adducts, polyoxyalkylene alkyl ethers, polyoxyalkylene fatty acid esters, polyoxyalkylene alkylphenols, polyoxyethylene sorbitol fatty acid esters, polyoxyethylene alkylphenyl formaldehyde condensates, polyoxyethylene sterols and derivatives thereof, polyoxyethylene lanolin and derivatives thereof, polyoxyethylene beeswax derivatives, sugar esters, polyoxyethylene hydrogenated castor oil, polyoxyethylene castor oil, etc.

The content of component (D) in the emulsion cosmetic composition of the present invention is not particularly limited, but is preferably 2.0 to 8.0% by mass, and more preferably 2.5 to 6.0% by mass, relative to 100% by mass of the emulsion cosmetic composition of the present invention. When the content is 2.0% by mass or more, the emulsion cosmetic composition is more stable. When the content is 8.0% by mass or less, the emulsion cosmetic composition is more non-sticky. The content of component (D) is the total content of all components (D) in the emulsion cosmetic composition of the present invention.

The content of the polyglycerol fatty acid ester in the emulsion cosmetic composition of the present invention is not particularly limited, but is preferably 2.0 to 8.0% by mass, and more preferably 2.5 to 6.0% by mass, relative to 100% by mass of the emulsion cosmetic composition of the present invention. When the content is 2.0% by mass or more, dripping upon application to a sterilized site can be further suppressed, and the emulsion cosmetic composition has better stability. When the content is 8.0% by mass or less, the emulsion cosmetic composition has better lack of stickiness. The content of the polyglycerol fatty acid ester is the total content of all polyglycerol fatty acid esters in the emulsion cosmetic composition of the present invention.

The content of polyglycerol fatty acid ester in component (D) is not particularly limited, but is preferably 60.0% by mass or more, more preferably 80.0% by mass or more, even more preferably 90.0% by mass or more, and particularly preferably 95.0% by mass or more, relative to 100% by mass of component (D). When the content is 60.0% by mass or more, dripping can be further suppressed when applied to the sterilized area, and the stability of the emulsion cosmetic composition is superior.

[Component (E)]
Component (E) is a bactericidal component, particularly a bactericidal component other than components (A), (B), and polyhydric alcohols other than component (B). By using component (E) in combination with components (A) and (B), the emulsion cosmetic composition of the present invention exerts a sufficient bactericidal effect. Component (E) may be used alone or in combination with two or more kinds.

Examples of component (E) include isopropylmethylphenol, benzalkonium chloride, benzethonium chloride, chlorhexidine hydrochloride, phenol, trichlorocarbanilide, chlorhexidine gluconate, triclosan, halocarbans such as triclocarban, piroctone olamine, zinc pyrithione, salicylic acid, sorbic acid, lysozyme chloride, and aluminum phenolsulfonate.

The content of component (E) in the emulsion cosmetic composition of the present invention is not particularly limited, but is preferably 0.01 to 5.0% by mass, and more preferably 0.02 to 1.0% by mass, relative to 100% by mass of the emulsion cosmetic composition of the present invention. When the content is 0.01% by mass or more, the bactericidal action is superior. When the content is 5.0% by mass or less, the stability of the emulsion cosmetic composition is superior. The content of component (E) is the total content of all components (E) in the emulsion cosmetic composition of the present invention.

[Component (F)]
Component (F) is sodium edetate (sodium ethylenediaminetetraacetate), a chelating agent that exhibits a chelating effect on a wide range of metals. By using component (F) in combination with components (A), (B), and (E), the emulsion cosmetic composition of the present invention exhibits a sufficient bactericidal effect. Component (F) may be used alone or in combination with two or more types.

Examples of component (F) include disodium edetate, trisodium edetate, and tetrasodium edetate.

The content of component (F) in the emulsion cosmetic composition of the present invention is not particularly limited, but is preferably 0.01 to 0.5% by mass, and more preferably 0.03 to 0.3% by mass, relative to 100% by mass of the emulsion cosmetic composition of the present invention. When the content is 0.01% by mass or more, the bactericidal action is superior. When the content is 0.5% by mass or less, the stability of the emulsion cosmetic composition is superior. The content of component (F) is the total content of all components (F) in the emulsion cosmetic composition of the present invention.

[Other ingredients]
The emulsion cosmetic composition of the present invention may contain components (other components) other than the above-mentioned components such as the components (A) to (F). The above-mentioned other components are not particularly limited, and examples thereof include components that are usually used in cosmetics and quasi-drugs. Specific examples thereof include water; oily components; higher alcohols; polyhydric alcohols other than component (B); anti-inflammatory agents such as glycyrrhizic acid and its salts; cooling agents such as menthol; pH adjusters such as phosphoric acid and its salts, citric acid and its salts, lactic acid and its salts, sodium hydroxide, and triethanolamine; fragrances; ultraviolet absorbers; antioxidants; preservatives; sequestering agents other than component (F); colorants; pigments; vitamins; amino acids; astringents; whitening agents; animal and plant extracts; neutralizing agents; antiperspirant components; deodorant components; acids; alkalis, etc. The above-mentioned other components may each be used alone or in combination of two or more.

The emulsion cosmetic composition of the present invention preferably contains an oil component and water as the other components. In this specification, the oil component may be referred to as "component (G)" and water as "component (H)."

Component (G) is an oil-based component, such as vegetable oil, ester oil, silicone oil, hydrocarbon oil, wax, etc. Component (G) may be used alone or in combination of two or more types.

Examples of the above vegetable oils include macadamia nut oil, eucalyptus oil, coconut oil, avocado oil, safflower oil, olive oil, palm oil, palm kernel oil, kukui nut oil, shea butter, cocoa butter, almond oil, sunflower oil, rosehip oil, olive squalane, camellia oil, kiwi fruit seed oil, camellia oil, apricot kernel oil, sesame oil, soybean oil, jojoba oil, castor oil, hazelnut oil, meadowfoam oil, peppermint oil, argan oil, carrot oil, lavender oil, sugar squalane, damask rose flower wax, centifolia rose flower wax, jasmine flower wax, camellia oil, and hydrogenated versions of these oils (e.g., hydrogenated castor oil, hydrogenated jojoba oil, hydrogenated palm oil, hydrogenated avocado oil, hydrogenated soybean oil, etc.).

Examples of the ester oils include ethyl oleate, isopropyl myristate, isopropyl palmitate, myristyl myristate, cetyl palmitate, 2-ethylhexyl palmitate, octyldodecyl myristate, isopropyl isostearate, propylene glycol isostearate, cetyl 2-ethylhexanoate, glyceryl tri-2-ethylhexanoate, caprylic/capric triglyceride, isononyl isononanoate, diisopropyl adipate, pentaerythrityl tetraoctanoate, pentaerythrityl tetraisostearate, and diisostearyl malate. glyceryl, erythrityl triethylhexanoate, 2-ethylhexyl hydroxystearate, dipentaerythrityl hexa(hydroxystearic acid/stearic acid/rosin acid), dipentaerythrityl tetra(hydroxystearic acid/isostearate), dipentaerythrityl hexahydroxystearate, glyceryl (ethylhexanoate/stearic acid/adipic acid), glyceryl tri(caprylic acid/capric acid/myristic acid/stearic acid), dipentaerythrityl hexa(behenic acid/benzoic acid/ethylhexanoate), and alkyl benzoate (C12-15).

The silicone oils are not particularly limited, but examples thereof include dimethyl silicone oils such as methyl polysiloxane (dimethyl polysiloxane) and highly polymerized methyl polysiloxane; methyl phenyl silicone oils such as methyl phenyl polysiloxane; cyclic silicone oils such as methyl cyclopolysiloxane, octamethyl cyclotetrasiloxane, decamethyl cyclopentasiloxane, and dodecamethyl cyclohexasiloxane; amino-modified silicones such as aminopropyl methyl siloxane-dimethyl siloxane copolymer, aminoethyl aminopropyl siloxane-dimethyl siloxane copolymer, and aminoethyl aminopropyl methyl siloxane-dimethyl siloxane copolymer, carboxy-modified silicone, fatty acid-modified silicone, alcohol-modified silicone, aliphatic alcohol-modified silicone, epoxy-modified silicone, fluorine-modified silicone, and alkyl-modified silicone; methyl hydrogen polysiloxane, dimethiconol, and the like.

Examples of the above-mentioned hydrocarbon oils include α-olefin oligomers, petrolatum, isoparaffin, light isoparaffin, light liquid isoparaffin, squalane, synthetic squalane, vegetable squalane, liquid isoparaffin, liquid paraffin, hydrogenated polyisobutene, hydrogenated (tetradecenyl/methylpentadecene), isododecane, etc.

Examples of the waxes include carnauba wax, candelilla wax, beeswax, rice bran wax, shellac wax, whale wax, lanolin, and sunflower seed wax.

The content of component (G) in the emulsion cosmetic composition of the present invention is not particularly limited, but is preferably 1.0 to 15.0% by mass, and more preferably 3.0 to 12.0% by mass, relative to 100% by mass of the emulsion cosmetic composition of the present invention. When the content is 1.0% by mass or more, the moisturizing feeling is excellent, the viscosity increases, dripping when applied to a sterilized area can be further suppressed, and the stability of the emulsion cosmetic composition is excellent. When the content is 15.0% by mass or less, the non-stickiness is excellent, and the stability of the emulsion cosmetic composition is excellent. The content of component (G) is the total content of all components (G) in the emulsion cosmetic composition of the present invention.

Component (H) is water, and is not particularly limited, but purified water is preferred. The content of component (H) in the emulsion cosmetic composition of the present invention is preferably 20.0 to 84.0% by mass, and more preferably 40.0 to 70.0% by mass, relative to 100% by mass of the emulsion cosmetic composition of the present invention. When the content is 20.0% by mass or more, the emulsion cosmetic composition is more excellent in terms of non-stickiness and in terms of stability. When the content is 84.0% by mass or less, the emulsion cosmetic composition is more excellent in terms of moisturizing feeling and in terms of stability.

The higher alcohols act as emulsifying aids in the emulsion cosmetic composition of the present invention, and further improve the stability of the emulsion cosmetic composition. Examples of the higher alcohols include cetyl alcohol, stearyl alcohol, isostearyl alcohol, myristyl alcohol, 2-octyldodecanol, oleyl alcohol, and behenyl alcohol. Only one type of higher alcohol may be used, or two or more types may be used.

The content of higher alcohol in the emulsion cosmetic composition of the present invention is preferably 0.5 to 8.0% by mass, and more preferably 1.0 to 5.0% by mass, based on 100% by mass of the emulsion cosmetic composition of the present invention. If the content is 0.5% by mass or more, the stability of the emulsion cosmetic composition is even more excellent. If the content is 8.0% by mass or less, the lack of stickiness is excellent.

It is preferable that the emulsion cosmetic composition of the present invention contains only small amounts of anionic surfactants, cationic surfactants, and amphoteric surfactants or substantially no anionic surfactants, cationic surfactants, and amphoteric surfactants. In other words, it is preferable that the emulsion cosmetic composition of the present invention does not contain anionic surfactants, cationic surfactants, and amphoteric surfactants, or that the total content of anionic surfactants, cationic surfactants, and amphoteric surfactants in the emulsion cosmetic composition of the present invention is 1% by mass or less (preferably 0.5% by mass or less, more preferably 0.3% by mass or less) relative to 100% by mass of the emulsion cosmetic composition of the present invention. When the content of the above surfactants is 1% by mass or less, the stability of the composition is excellent and stickiness during application can be further suppressed.

The emulsion cosmetic composition of the present invention is an emulsion composition, and is preferably an oil-in-water (O/W) type emulsion cosmetic composition. Examples of the formulation of the emulsion cosmetic composition of the present invention include creams and emulsions.

The emulsion cosmetic composition of the present invention is used, for example, as cosmetics, quasi-drugs, pharmaceuticals, miscellaneous goods, etc. Specifically, it is preferably used as face cosmetics (moisturizing cosmetics, massage cosmetics, etc.), body cosmetics (moisturizing cosmetics, massage cosmetics, deodorant cosmetics, etc.), hand cosmetics, etc.

The emulsion cosmetic composition of the present invention is preferably a skin cosmetic composition that is applied to the skin. The areas on which the emulsion cosmetic composition of the present invention is applied are not particularly limited, and examples include the face (e.g., the forehead, eyes, corners of the eyes, cheeks, mouth, etc.), arms, elbows, palms, backs of the hands, fingertips, feet, knees, heels, neck, armpits, back, etc.

The emulsion cosmetic composition of the present invention is not particularly limited and can be produced by known or conventional methods. For example, the above components are mixed and stirred in a homomixer to emulsify the components.

The emulsion cosmetic composition of the present invention exhibits excellent antibacterial action even when the content ratios of components (A) and (B) are low, by combining and blending a lower alcohol [component (A)], a dihydric alcohol and/or a trihydric alcohol [component (B)], a bactericidal component [component (E)], and sodium edetate [component (F)]. In addition, the low content ratio of component (A) allows for a low alcohol odor. A stable emulsion state can be formed by blending a nonionic surfactant [component (D)] that contains a polyglycerol fatty acid ester and has an HLB value of 8.0 to 15.0 as a surfactant. The blending of a thickener [component (C)] allows for sufficient thickening while suppressing stickiness, provides excellent moisturizing feeling, and is less likely to cause dripping. Therefore, the emulsion cosmetic composition of the present invention is excellent in stability and usability.

The present invention will be described in more detail below based on examples, but the present invention is not limited to these examples. The amounts listed in the tables are the amounts of each component (i.e., the amount of active ingredient in each raw material, so-called pure content), and are expressed in "mass %" unless otherwise specified. In addition, "-" in the tables indicates that no ingredient was added. Here, Example 4 should be read as Reference Example 1.

Examples and Comparative Examples Each cosmetic composition of the Examples and Comparative Examples was prepared by a conventional method using the components (components (A) to (H)) and other components shown in the table.

The main ingredients listed in the table are as follows:

<Component (C)>
Hydrophobized hydroxypropyl methylcellulose: Trade name "Sangelose 60L", manufactured by Daido Chemical Industry Co., Ltd. <Nonionic surfactant>
Polyoxyethylene cetyl ether: Trade name "EMALEX120", manufactured by Nippon Emulsion Co., Ltd. Decaglyceryl monostearate: Trade name "NIKKOL DECAGLYN 1-SV", manufactured by Nippon Surfactant Industrial Co., Ltd. Decaglyceryl distearate: Trade name "NIKKOL DECAGLYN 2-SV", manufactured by Nippon Surfactant Industrial Co., Ltd. Polyglyceryl monooleate: Trade name "NIKKOL DGMO-CV", manufactured by Nippon Surfactant Industrial Co., Ltd. Glyceryl monostearate: Trade name "CUTINA GMS-V", manufactured by BASF Japan Ltd.

(evaluation)
The cosmetic compositions obtained in the Examples and Comparative Examples were evaluated as follows. The evaluation results are shown in the table. In the table, "-" indicates that no evaluation was performed. Note that in Comparative Example 8, no emulsion composition was obtained, so no other evaluations were performed.

(1) Non-Dripping Each of the cosmetic compositions obtained in the Examples and Comparative Examples was applied to the back of the hand, and the non-dripping during application was evaluated. The non-dripping was then judged according to the following criteria.
[Judgment criteria]
A (Excellent): Does not drip from the back of the hand.
B (good): Feels looser than A, but does not drip off the back of the hand.
C (Poor): Dripping from the back of the hand.

(2) Moisturizing Feeling Each of the cosmetic compositions obtained in the Examples and Comparative Examples was applied to the back of the hand, and the moisturizing feel after the composition was felt to be familiar to the skin was evaluated. The moisturizing feel was then evaluated according to the following criteria.
[Judgment criteria]
A (Excellent): The skin where the product was applied feels very moist and smooth.
B (Good): The skin where the product was applied feels moist and smooth.
C (bad): The skin on the applied area does not feel moist or moist at all, or only slightly.

(3) Non-stickiness Each of the cosmetic compositions obtained in the Examples and Comparative Examples was applied to the back of the hand, and the stickiness after it was felt to be familiar to the skin was evaluated. The non-stickiness was then judged according to the following criteria.
[Judgment criteria]
A (Excellent): No stickiness felt after application.
B (Good): Slight stickiness felt after application.
C (poor): Stickiness is clearly felt after application.

(4) Absence of alcohol odor Each of the cosmetic compositions obtained in the Examples and Comparative Examples was applied to the back of the hand, and the alcohol odor was evaluated while the cosmetic composition was being rubbed into the skin. The absence of alcohol odor was then evaluated according to the following criteria.
[Judgment criteria]
A (Excellent): No smell of alcohol is detectable.
B (Good): A slight alcohol smell is detectable.
C (poor): The smell of alcohol is clearly noticeable.

(5) Bactericidal Action Bacterial solution 1 (Escherichia coli) and bacterial solution 2 (Staphylococcus aureus) were added to each of the cosmetic compositions obtained in the Examples and Comparative Examples, and the mixture was stirred for 5 minutes, then mixed into an agar medium and cultured for 48 hours, and the number of bacteria was evaluated. The evaluation was performed by calculating the ratio of the number of bacteria killed by contact with each cosmetic composition to the number of bacteria in the bacterial solution before the addition of each cosmetic composition. The bactericidal action was then evaluated according to the following criteria.
[Judgment criteria]
A (Excellent): 99.99% or more of the bacteria were killed in both bacteria solution 1 and bacteria solution 2.
B (Good): 99.9% or more but less than 99.99% of the bacteria were killed in both bacterial solution 1 and bacterial solution 2, or 99.9% or more but less than 99.99% of the bacteria were killed in either bacterial solution 1 or bacterial solution 2, and 99.99% or more of the bacteria were killed in the other.
C (Poor): Less than 99.9% of the bacteria were killed in at least one of the bacteria solutions 1 and 2.

(6) Stability Each of the cosmetic compositions obtained in the Examples and Comparative Examples was sealed in a transparent glass container and left to stand for one week in a thermostatic chamber in which the temperature was changed from 5°C to 45°C in a 24-hour cycle. After being left to stand for one week, each cosmetic composition was visually observed. The stability was then evaluated according to the following criteria.
[Judgment criteria]
A (Excellent): No separation or aggregation is observed, and the product is creamy.
B (good): Creamy, although slight separation or aggregation is observed.
C (poor): Separation or aggregation is clearly observed, and the mixture is non-uniform.

As shown in the table, the emulsion cosmetic composition of the present invention (Example) was evaluated as having excellent bactericidal action, non-stickiness, moisturizing feeling, low alcohol odor, and stability, and also suppressed dripping. On the other hand, when the content of component (A) was low (Comparative Example 1), when component (F) was not blended (Comparative Example 9), and when another chelating agent was used instead of component (F) (Comparative Examples 10 and 11), all of them were evaluated as having poor bactericidal action. When the content of component (A) was high (Comparative Examples 2 and 3), it was evaluated as having a strong alcohol odor. When the content of component (B) was low (Comparative Example 4), it was evaluated as having poor moisturizing feeling. When the content of component (B) was high (Comparative Example 5), it was evaluated as having poor non-stickiness. When polyglycerol fatty acid ester was not used as the nonionic surfactant (Comparative Examples 6 and 7), dripping occurred and it was evaluated as having poor usability. When the HLB value of the nonionic surfactant was low (Comparative Example 8), it was not emulsified and it was not possible to prepare an emulsion composition.

Further, formulation examples of the emulsion cosmetic composition of the present invention are shown below.
Formulation Example 1: Hand cream Ethanol 15.0% by mass
Dipropylene glycol 5.0% by mass
Glycerin 5.0% by mass
Carboxyvinyl polymer 0.4% by mass
Decaglyceryl monostearate (HLB: 9.5) 3.0% by mass
Polyglyceryl monooleate (HLB: 5.5) 1.0% by mass
Benzalkonium chloride 0.08% by mass
Disodium edetate 0.08% by mass
Shea butter 2.0% by mass
Isopropyl myristate 1.0% by mass
Liquid paraffin 1.0% by mass
Behenyl alcohol 1.5% by mass
Setanol 0.3% by mass
Fragrance 0.1% by mass
Purified water Remainder

Formulation Example 2: Hand cream Ethanol 18.0% by mass
1,3-butylene glycol 4.0% by mass
Glycerin 10.0% by mass
Xanthan gum 0.3% by mass
Decaglyceryl distearate (HLB: 9.5) 5.0% by mass
Benzethonium chloride 0.05% by mass
Disodium edetate 0.2% by mass
Isononyl isononanoate 1.0% by mass
Squalane 2.0% by mass
Beeswax 1.0% by mass
Behenyl alcohol 1.0% by mass
Setanol 0.8% by mass
Fragrance 0.08% by mass
Purified water Remainder

Claims (1)

The composition contains the following components (A), (B), (C), (D), (E), and (F),
The content of component (A) is 8.0 to 25.0 mass% and the content of component (B) is 8.0 to 18.0 mass%,
The component (B) contains a trihydric alcohol, and the content of the trihydric alcohol is 2.0 to 15.0 mass %,
The emulsion cosmetic composition contains a polyglycerol fatty acid ester in an amount of 2.0 to 8.0% by mass .
Component (A): Lower alcohol Component (B): Dihydric alcohol and/or trihydric alcohol Component (C): Thickener Component (D): Nonionic surfactant containing polyglycerol fatty acid ester and having an HLB value of 8.0 to 15.0 Component (E): Bactericidal component Component (F): Sodium edetate