JP2025099550A - Cosmetic composition - Google Patents

Abstract

[Problem] The object of the present invention is to provide a cosmetic composition which is an oil-in-water Pickering emulsion with excellent aesthetics, in which spherical emulsion particles are dispersed using a starch octenylsuccinate metal salt as a powder. [Solution] The cosmetic composition of the present invention is an oil-in-water Pickering emulsion, and contains component A: a starch octenylsuccinate metal salt; component B: an oil-based component which is liquid at 25°C and is selected from the group consisting of hydrocarbon oils, ester oils, silicone oils, and vegetable oils; component C: pentylene glycol; component D: ethanol; and component E: water, and the IOB value of component B is 0 to 0.45. [Selected Figure] None

Description

The present invention relates to a cosmetic composition.

Some cosmetics, such as skin care agents and deodorants, use so-called Pickering emulsions, in which oil droplets are stabilized by powder and contain no or only a small amount of surfactant. When Pickering emulsions are used in cosmetics, they are very useful in that they can suppress the irritation and stickiness caused by surfactants, and can achieve the powder-derived effect of making sticky skin feel smooth, while at the same time providing a feeling of low friction on the skin when rubbing it due to the oily components, and further reducing the powdery feeling to provide an appropriate moisturizing feeling. Cosmetics using Pickering emulsions are known, for example, from those disclosed in Patent Documents 1 and 2.

JP 2000-95638 A JP 2000-95639 A

In Pickering emulsions, the shape and size of the emulsion particles formed are greatly affected by the type of powder used and the polarity of the oil and water phases. Pickering emulsions with spherical emulsion particles of relatively uniform size are aesthetically pleasing and useful, but when starch octenyl succinate metal salt is used as the powder and the water phase is an aqueous solution with a low ethanol concentration, it can be difficult to form such a Pickering emulsion.

The object of the present invention is to provide a cosmetic composition that uses a metal salt of starch octenyl succinate as a powder and is an oil-in-water Pickering emulsion with excellent aesthetics, in which spherical emulsion particles are dispersed.

The present invention provides a cosmetic composition which is an oil-in-water Pickering emulsion and contains the following components (A), (B), (C), (D), and (E), wherein the IOB value of component (B) is 0 to 0.45.
Component (A): octenylsuccinic acid starch ester metal salt Component (B): an oil-based component which is liquid at 25°C and is selected from the group consisting of hydrocarbon oils, ester oils, silicone oils, and vegetable oils Component (C): pentylene glycol Component (D): ethanol Component (E): water

The content of component (C) is preferably 0.5 to 5.0 mass%.

The content of component (D) is preferably 1.0% by mass or more.

The content of component (B) is preferably 0.01 to 20.0 mass%.

It is preferable that the mass ratio of the content of component (B) to the content of component (A) is 0.45 to 1.0.

The cosmetic composition of the present invention is a Pickering emulsion that uses a metal salt of starch octenyl succinate as a powder, and can form an oil-in-water Pickering emulsion in which spherical emulsion particles are dispersed over a wide range of ethanol concentrations in the aqueous phase, from low to high, and has excellent aesthetic properties.

The present invention is described in detail below.

The cosmetic composition of the present invention contains at least: a metal salt of starch ester of octenyl succinic acid; an oil component that is liquid at 25°C and is selected from the group consisting of hydrocarbon oils, ester oils, silicone oils, and vegetable oils; pentylene glycol; ethanol; and water. In this specification, the above-mentioned "metal salt of starch ester of octenyl succinic acid" may be referred to as "component (A)", the above-mentioned "oil component that is liquid at 25°C and is selected from the group consisting of hydrocarbon oils, ester oils, silicone oils, and vegetable oils" may be referred to as "component (B)", the above-mentioned "pentylene glycol" may be referred to as "component (C)", the above-mentioned "ethanol" may be referred to as "component (D)", and the above-mentioned "water" may be referred to as "component (E)".

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

The cosmetic composition of the present invention is an oil-in-water (O/W) Pickering emulsion. The cosmetic composition of the present invention is a Pickering emulsion having an aqueous phase containing components (C), (D), and (E) and an oil phase (oil droplets) containing component (B) dispersed in the aqueous phase. The Pickering emulsion has a structure in which component (A) is present at the interface between the aqueous phase and the oil phase. In addition, since the cosmetic composition of the present invention is a Pickering emulsion, it can form an emulsion substantially free of nonionic surfactants and anionic surfactants. Therefore, the cosmetic composition of the present invention can form an emulsion that does not contain nonionic surfactants and/or anionic surfactants, or in which the content of nonionic surfactants and/or anionic surfactants is 0.1 mass% or less. Since the cosmetic composition of the present invention is a Pickering emulsion, emulsion particles exist as particles of a visible size, and have a unique aesthetic appearance.

[Component (A): Metal salt of octenyl succinic acid starch ester]
Component (A) is a powder of starch octenyl succinate metal salt. Component (A) exerts the effect of forming a Pickering emulsion by being present at the interface between the water phase and the oil phase (oil droplets). In addition, when applied to the skin, it can give a smooth feeling. Component (A) may be used alone or in combination of two or more.

Component (A) includes aluminum salts, calcium salts, barium salts, iron salts, etc. of starch octenylsuccinate. Among them, aluminum salts (aluminum starch octenylsuccinate) are preferred. The above-mentioned aluminum starch octenylsuccinate may be written as starch Al octenylsuccinate or aluminum corn starch ester octenylsuccinate. The above-mentioned aluminum starch octenylsuccinate may be written as ALUMINUM STARCH OCTENYLSUCCINATE under the INCI (International Nomenclature for Cosmetic Ingredients) name.

Component (A) may be a commercially available product. Examples of commercially available products of component (A) include "DRY-FLO PURE" and "DRY-FLO PC" (both manufactured by Nouryon) and "Octie" (manufactured by Nippon Starch Chemical Co., Ltd.).

In the cosmetic composition of the present invention, component (A) is a powder. When the metal salt of starch ester of octenyl succinic acid is heated to a relatively high temperature (e.g., 60°C or higher), it becomes hydrophilic and gelatinized (so-called gelatinization or gelatinization) and is no longer in a powder state, and may be used as a thickener. When the metal salt of starch ester of octenyl succinic acid is blended in the cosmetic composition of the present invention, it is characterized in that it is included in the form of a powder. For this reason, in the manufacturing process of the cosmetic composition of the present invention, the metal salt of starch ester of octenyl succinic acid is preferably used at a temperature of less than 60°C (more preferably less than 55°C).

In the cosmetic composition of the present invention, the mass ratio of the content of component (B) to the content of component (A) [(B)/(A)] is preferably 0.45 or more, more preferably 0.6 or more, and preferably 1.0 or less, more preferably 0.8 or less. When the mass ratio is 0.45 or more, free component (A) that is not contained in the emulsion particles is more unlikely to occur. Also, when the mass ratio is 1.0 or less, oil floating (oil components that are not contained in the emulsion particles float and form an oil phase on the surface layer of the composition) is more unlikely to occur. The content of component (A) in 100% by mass of the cosmetic composition of the present invention is not particularly limited, but is preferably 0.01% by mass or more, more preferably 0.05% by mass or more, and preferably 5.0% by mass or less, more preferably 1.0% by mass or less.

[Component (B): an oil-based component which is liquid at 25° C. and is selected from the group consisting of hydrocarbon oils, ester oils, silicone oils, and vegetable oils]
Component (B) is an oil component selected from the group consisting of hydrocarbon oils, ester oils, silicone oils, and vegetable oils. Component (B) is a component that forms the oil phase (oil droplets) of the Pickering emulsion. Component (B) may be used alone or in combination of two or more.

Component (B) is liquid at 25°C. Component (B) has fluidity at 25°C. The viscosity η of component (B) measured at 25°C using a Brookfield rotational viscometer is preferably 30,000 mPa·s or less (e.g., 0.1 to 30,000 mPa·s), and more preferably 1.0 to 10,000 mPa·s.

The IOB value of component (B) is 0 to 0.45, more preferably 0 to 0.35, and even more preferably 0 to 0.15. By having the IOB value within the above range, the powder exerts an adsorption effect on the oil-water interface. The IOB (Inorganicity Organicity Balance) value is a value obtained by dividing the inorganic value (Inorganicity) of a substance by the organic value (Organicity). The IOB values of various substances can be determined, for example, by referring to the description in [Koda Yoshio, Organic Concept Diagram: Basics and Applications, Sankyo Publishing, 1984, pp. 11-17]. When multiple types of component (B) are used, the above "IOB value of component (B)" is the weighted average of the IOB values of each component (B), that is, the IOB value of the entire component (B).

Examples of the above-mentioned hydrocarbon oils include isoparaffin, light isoparaffin, light liquid isoparaffin, squalane (synthetic squalane, vegetable squalane, etc.), liquid isoparaffin, liquid paraffin, hydrogenated polyisobutene, isododecane, etc.

Examples of the above ester oils include isopropyl myristate, isopropyl palmitate, myristyl myristate, cetyl palmitate, 2-ethylhexyl palmitate, octyldodecyl myristate, isopropyl isostearate, cetyl 2-ethylhexanoate, glyceryl tri-2-ethylhexanoate, caprylic/capric triglyceride, isononyl isononanoate, diisopropyl adipate, pentaerythrityl tetraoctanoate, and diisostearyl malate.

Examples of the above vegetable oils include macadamia nut oil, olive oil, palm oil, sunflower oil, jojoba oil, and argan oil.

Examples of the silicone oil include dimethyl silicone oils such as dimethylpolysiloxane (dimethicone) and highly polymerized dimethylpolysiloxane; and methylphenyl silicone oils such as methylphenylpolysiloxane.

Component (B) is preferably an oil component that is liquid at 25°C and is selected from the group consisting of hydrocarbon oils, ester oils, and vegetable oils. Among these, liquid paraffin, squalane (including vegetable squalane such as sugar squalane and olive squalane), light isoparaffin, glyceryl tri-2-ethylhexanoate, cetyl 2-ethylhexanoate, and isononyl isononanoate are more preferred.

The content of component (B) in the cosmetic composition of the present invention is not particularly limited, but is preferably 0.01 to 20.0% by mass, and more preferably 0.05 to 10.0% by mass, relative to 100% by mass of the cosmetic composition of the present invention. When the content is 0.01% by mass or more, a Pickering emulsion is more easily formed. When the content is 20.0% by mass or less, oil floating can be further reduced, resulting in a more aesthetically pleasing composition. The content of component (B) is the total content of all components (B) in the cosmetic composition of the present invention.

[Component (C): Pentylene glycol]
Component (C) is pentylene glycol (1,2-pentanediol). The pentylene glycol is, for example, represented by the INCI name PENTYLENE GLYCOL. Component (C) is present in the aqueous phase of the Pickering emulsion, and is presumed to interact with the powder to improve the wettability of the powder to the aqueous phase, but it also exerts the effect of forming a Pickering emulsion of spherical emulsion particles of relatively uniform size even if the aqueous phase has a low ethanol concentration.

The content of component (C) in the cosmetic composition of the present invention is not particularly limited, but is preferably 0.5 to 5.0% by mass, and more preferably 1.0 to 5.0% by mass, relative to 100% by mass of the cosmetic composition of the present invention. When the content is 0.5% by mass or more, it becomes easier to form a Pickering emulsion of spherical emulsion particles of uniform size. When the content is 5.0% by mass or less, the irritation felt when the cosmetic composition is applied to the face, etc. can be further reduced.

[Component (D): Ethanol]
Component (D) is ethanol. Component (D) is present in the aqueous phase of the Pickering emulsion and exerts the effect of adjusting the polarity of the aqueous phase. In addition, it exerts the effect of enhancing the quick-drying property, refreshing feeling, bactericidal effect, etc. of the cosmetic composition of the present invention. The higher the content of component (D), the easier it is to form a Pickering emulsion using components (A), (B) and (E). However, in the present invention, by using component (C) in combination, even if the content of component (D) is low, a Pickering emulsion of spherical emulsion particles with a relatively uniform size can be formed.

The content of component (D) in the cosmetic composition of the present invention is not particularly limited, but is preferably 1.0% by mass or more, more preferably 3.0% by mass or more, relative to 100% by mass of the cosmetic composition of the present invention. When the content is 1.0% by mass or more, it becomes easier to form a Pickering emulsion of spherical emulsion particles of uniform size. The upper limit of the content of component (D) is not particularly limited, but from the viewpoint of further reducing the irritation when the cosmetic composition is applied to the face, etc., it may be, for example, 20.0% by mass or less, or 10.0% by mass or less, relative to 100% by mass of the cosmetic composition of the present invention.

[Component (E): Water]
Component (E) is water, preferably purified water. Component (E) forms the aqueous phase of the Pickering emulsion. The content of component (E) in the cosmetic composition of the present invention is not particularly limited, but is preferably 40 to 98% by mass, more preferably 50 to 90% by mass, relative to 100% by mass of the cosmetic composition of the present invention.

[Other ingredients]
The cosmetic composition of the present invention may contain components other than the components (A) to (E) to the extent that the effects of the present invention are not impaired. The components other than the components (A) to (E) may each be used alone or in combination of two or more.

Examples of ingredients other than the above ingredients (A) to (E) include lower alcohols other than ingredient (D); polyhydric alcohols other than ingredient (C); thickeners; higher alcohols having 8 to 22 carbon atoms, such as lauryl alcohol, myristyl alcohol, cetyl alcohol, stearyl alcohol, isostearyl alcohol, cetostearyl alcohol, and oleyl alcohol; higher fatty acids having 8 to 22 carbon atoms, such as lauric acid, myristic acid, stearic acid, isostearic acid, palmitic acid, and behenic acid; sequestering agents (disodium edetate, etc.); antioxidants; plant extracts; dyes; pigments; pH adjusters (lactic acid, sodium lactate, citric acid, sodium citrate, triethanolamine, etc.); bactericides (isopropylmethylphenol, benzalkonium chloride, etc.); antiperspirants; cooling agents; anti-inflammatory agents; fragrances; preservatives (phenoxyethanol, parabens, etc.); hyaluronic acid and its derivatives; vitamins (niacinamide, etc.); and ceramides.

[Polyhydric alcohol other than component (C)]
The cosmetic composition of the present invention may contain a polyhydric alcohol other than component (C) from the viewpoint of improving the moisturizing effect, etc. Examples of polyhydric alcohols other than component (C) include glycols such as ethylene glycol, diethylene glycol, triethylene glycol, polyethylene glycol, propylene glycol, dipropylene glycol, polypropylene glycol, isoprene glycol, 1,3-butylene glycol, 1,2-butanediol, 1,2-hexanediol, 1,2-octanediol, and 1,2-decanediol; glycerins such as glycerin, diglycerin, and polyglycerin; and sugar alcohols such as xylitol, trehalose, maltitol, mannitol, sorbitol, erythritol (erythritol), arabitol, ribitol, galactitol, and glucitol. The content of the polyhydric alcohol other than component (C) in the cosmetic composition of the present invention is not particularly limited, but is preferably 3.0 to 40.0 mass% and more preferably 5.0 to 35.0 mass% relative to 100 mass% of the cosmetic composition of the present invention.

[Thickener]
The cosmetic composition of the present invention may contain a thickener. By incorporating a thickener, the viscosity of the cosmetic composition can be increased, and for example, emulsion particles can be suspended, thereby improving the aesthetic appearance. Examples of the thickener include acrylic thickeners such as carboxyvinyl polymer, (acrylates/alkyl acrylate (C10-30)) crosspolymer (acrylic acid/alkyl methacrylate copolymer), alkyl acrylate copolymer (trade name "Accurin 33A" etc.), (acrylates/steareth-20 methacrylate) copolymer (trade name "Accurin 22" etc.), (acrylates/beheneth-25 methacrylate) copolymer and (acrylates/vinyl neodecanoate) crosspolymer; cellulose thickeners such as methylcellulose, ethylcellulose, hydroxymethylcellulose, hydroxyethylcellulose, hydroxypropylcellulose, carboxymethylcellulose, hydroxypropylmethylcellulose, cellulose nanofiber; and natural gum thickeners such as xanthan gum, gelatin, guar gum, carrageenan, pectin and locust bean gum. The content of the thickener in the cosmetic composition of the present invention is not particularly limited, but is preferably 0.01 to 2.0% by mass, and more preferably 0.05 to 1.5% by mass, relative to 100% by mass of the cosmetic composition of the present invention.

[Surfactant]
Since the cosmetic composition of the present invention is a Pickering emulsion, it can form an emulsion without substantially containing a surfactant. The content of the surfactant in the cosmetic composition of the present invention may be 0.1% by mass or less, or 0.01% by mass or less, based on 100% by mass of the cosmetic composition of the present invention. The cosmetic composition of the present invention may not contain a surfactant. In particular, from the viewpoint of further enhancing the formability of a Pickering emulsion, it is preferable that the cosmetic composition of the present invention substantially does not contain a nonionic surfactant and an anionic surfactant. It is preferable that the cosmetic composition of the present invention does not contain a nonionic surfactant and an anionic surfactant, or the content of the nonionic surfactant and/or anionic surfactant in the cosmetic composition of the present invention is 0.1% by mass or less, more preferably 0.01% by mass or less, based on 100% by mass of the cosmetic composition of the present invention. When the content is 0.1% by mass or less, the irritation and stickiness to the skin caused by the nonionic surfactant and the anionic surfactant can be further reduced.

(Other details of the cosmetic composition)
The form of the cosmetic composition of the present invention is not particularly limited, and may be any of a liquid, gel, cream, wax, and solid form. The cosmetic composition of the present invention is preferably in a liquid or gel form.

The formulation of the cosmetic composition of the present invention is not particularly limited, but examples include lotion, mist, gel, spray (aerosol type, non-aerosol type), tube, sheet, roll-on, etc. The cosmetic composition of the present invention is preferably used in the form of a lotion or gel.

From the viewpoint of ease of application, the viscosity of the cosmetic composition of the present invention at 25°C is preferably 5.0 mPa·s or more, more preferably 10.0 mPa·s or more, and preferably 7000 mPa·s or less, more preferably 5000 mPa·s or less. The above viscosity is measured using a viscometer with a No. 4 rotor at a rotation speed of 12 rpm for a rotation time of 1 minute. As the above viscometer, for example, a TV-22 type viscometer manufactured by Toki Sangyo Co., Ltd. can be used.

The cosmetic composition of the present invention may be used for any purpose, including but not limited to the skin (e.g., face, neck, scalp, shoulders, body, arms, elbows, palms, backs of hands, thighs, calves, knees, ankles, tops of feet, soles of feet, etc.) and hair. In other words, the cosmetic composition of the present invention may be used as either a hair cosmetic or a skin cosmetic. Of these, the cosmetic composition of the present invention is preferably used as a skin cosmetic.

The cosmetic composition of the present invention is not particularly limited and can be produced by known or conventional methods. For example, the components can be mixed by mixing the above-mentioned components and stirring them using a known stirring device such as a disperser mixer or a paddle mixer.

The present invention will be specifically described below with reference to examples and comparative examples. The present invention is not limited to the following examples.

Examples and Comparative Examples
The ingredients shown in the table below were mixed (unit: mass%) to prepare cosmetic compositions having the compositions shown in the table below by a conventional method. The amounts in the table are shown as the amounts of pure ingredients (unit: mass%).

(evaluation)
The evaluation was carried out as follows: The evaluation was carried out by three expert evaluators.

(1) Formability of Pickering Emulsion 20 g of the cosmetic compositions obtained in the Examples and Comparative Examples were filled into a 30 ml screw tube. The cosmetic compositions were visually observed both when left to stand (emulsion particles settled) and when stirred (emulsion particles dispersed), and were evaluated according to the following criteria.
<Evaluation criteria>
Good (◯): The emulsion particles appear to have a uniform particle size and there is an impression that the proportion of spherical emulsion particles is high, resulting in an excellent appearance.
Poor (x): The emulsion particles appear to have non-uniform particle sizes and/or there appears to be a high proportion of non-spherical emulsion particles, resulting in poor aesthetic appearance.

The results are shown in the table below.

As shown in the table, the cosmetic compositions of the present invention (Examples) were cosmetic compositions that had good formability for a Pickering emulsion and were excellent in appearance.
Furthermore, in the cosmetic composition of the present invention (Example), no oily layer (so-called oily floating) was observed on the top layer of the composition in the above evaluation, and the cosmetic composition had a good appearance. On the other hand, in the cosmetic composition of the comparative example (Example), oily floating was clearly observed in the above evaluation, and in this respect too, the cosmetic composition had a poor appearance.

The following is a formulation example of the cosmetic composition of the present invention.

Claims (5)

A cosmetic composition which is an oil-in-water Pickering emulsion and contains the following components A, B, C, D, and E, and wherein the IOB value of component B is 0 to 0.45.
Component A: octenylsuccinic acid starch ester metal salt Component B: an oil-based component which is liquid at 25°C and is selected from the group consisting of hydrocarbon oils, ester oils, silicone oils, and vegetable oils Component C: pentylene glycol Component D: ethanol Component E: water The cosmetic composition according to claim 1, wherein the content of component C is 0.5 to 5.0 mass%. The cosmetic composition according to claim 1 or 2, wherein the content of component D is 1.0% by mass or more. The cosmetic composition according to claim 1 or 2, in which the content of component B is 0.01 to 20.0 mass%. The cosmetic composition according to claim 1 or 2, wherein the mass ratio of the content of component B to the content of component A is 0.45 to 1.0.