Cosmetic composition

Abstract

To provide a cosmetic composition being in the form of a water-in-oil Pickering emulsion, which employs a metal salt of octenyl succinic acid starch ester as a powder, has spherical emulsion particles dispersed therein, and exhibits superior aesthetic quality.SOLUTION: A cosmetic composition of the present invention is a water-in-oil Pickering emulsion, and comprises Component A: a metal salt of octenyl succinic acid starch ester, Component B: an oily 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, where Component B has an IOB value of 0 to 0.45.SELECTED DRAWING: None

Description

Technical Field

[0001] The present invention relates to a cosmetic composition.

Background Art

[0002] Among cosmetics such as skin care agents and deodorant agents, there are those that use so-called Pickering emulsions in which oil droplets are stabilized by powders and contain no surfactant or only a small amount thereof. When a Pickering emulsion is used in a cosmetic, it is possible to suppress irritation and stickiness to the skin caused by the surfactant, obtain the effect derived from the powder of making the sticky skin feel smooth, and at the same time, the oily component can impart a low feeling of skin friction felt when rubbing the skin, and further reduce the powdery feeling and impart an appropriate moisturizing feeling, which is very useful. As cosmetics using Pickering emulsions, for example, those disclosed in Patent Documents 1 and 2 are known.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Patent Document 2

Summary of the Invention

Problems to be Solved by the Invention

[0004] In Pickering emulsions, the shape and size of the formed emulsion particles are greatly affected by the type of powder used and the polarity of the oil phase and the aqueous phase. A Pickering emulsion with spherical emulsion particles of relatively uniform size is excellent in aesthetics and useful, but when an octenyl succinic acid starch ester metal salt is used as the powder and the aqueous phase is an aqueous solution with a low ethanol concentration, it may be difficult to form such a Pickering emulsion.

[0005] Therefore, an object of the present invention is to provide a cosmetic composition which is a water-in-oil type pickering emulsion excellent in aesthetic property, in which octenyl succinic acid starch ester metal salt is used as a powder and spherical emulsion particles are dispersed.

Means for Solving the Problems

[0006] The present invention provides a water-in-oil type pickering emulsion cosmetic composition containing the following component (A), the following component (B), the following component (C), the following component (D), and the following component (E), and having an IOB value of component (B) of 0 to 0.45. Component (A): Octenyl succinic acid starch ester metal salt Component (B): An oily component which is liquid at 25°C and is selected from the group consisting of hydrocarbon oil, ester oil, silicone oil, and vegetable oil Component (C): Pentylene glycol Component (D): Ethanol Component (E): Water

[0007] The content of component (C) is preferably 0.5 to 5.0% by mass.

[0008] The content of component (D) is preferably 1.0% by mass or more.

[0009] The content of component (B) is preferably 0.01 to 20.0% by mass.

[0010] The mass ratio of the content of component (B) to the content of component (A) is preferably 0.45 to 1.0.

Effects of the Invention

[0011] The cosmetic composition of the present invention is a pickering emulsion using octenyl succinic acid starch ester metal salt as a powder, and can form a water-in-oil type pickering emulsion in which spherical emulsion particles are dispersed in a wide range from a low concentration to a high concentration of the ethanol concentration in the aqueous phase, and is excellent in aesthetic property.

Mode for Carrying Out the Invention

[0012] Hereinafter, the present invention will be described in detail.

[0013] The cosmetic composition of the present invention contains at least an octenyl succinic acid starch ester metal salt; an oily component selected from the group consisting of a hydrocarbon oil, an ester oil, a silicone oil, and a vegetable oil, which is liquid at 25°C; pentylene glycol; ethanol; and water. In this specification, the above "octenyl succinic acid starch ester metal salt" may be referred to as "component (A)", the above "oily component selected from the group consisting of a hydrocarbon oil, an ester oil, a silicone oil, and a vegetable oil, which is liquid at 25°C" may be referred to as "component (B)", the above "pentylene glycol" may be referred to as "component (C)", the above "ethanol" may be referred to as "component (D)", and the above "water" may be referred to as "component (E)".

[0014] 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 components (A) to (E). In addition, each component contained in the cosmetic composition of the present invention, for example, each of component (A), component (B), and other components, may be used alone or in combination of two or more.

[0015] The cosmetic composition of the present invention is an oil-in-water (O / W) type Pickering emulsion. The cosmetic composition of the present invention is a Pickering emulsion having an aqueous phase containing component (C), component (D), and component (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. Further, 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 a nonionic surfactant and / or an anionic surfactant, or has a content ratio of a nonionic surfactant and / or an anionic surfactant of 0.1% by 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.

[0016] [Component (A): Metal salt of octenyl succinate starch ester] Component (A) is a powder that is a metal salt of octenyl succinate starch ester. Component (A) exhibits the effect of forming a Pickering emulsion by being present at the interface between the aqueous phase and the oil phase (oil droplets). Further, when applied to the skin, it can impart a smooth feeling. Component (A) may be used alone or in combination of two or more.

[0017] Examples of component (A) include aluminum salts, calcium salts, barium salts, and iron salts of octenyl succinate starch ester. Among them, an aluminum salt (aluminum octenyl succinate starch) is preferable. The aluminum octenyl succinate starch may be referred to as aluminum octenyl succinate starch or aluminum octenyl succinate corn starch ester. Further, the aluminum octenyl succinate starch may be denoted as ALUMINUM STARCH OCTENYLSUCCINATE in the INCI (International Nomenclature for Cosmetic Ingredients) name.

[0018] As the component (A), commercially available products can also be used. Examples of commercially available products of the component (A) include the product name "DRY-FLO PURE", the product name "DRY-FLO PC" (both manufactured by Nouryon), the product name "Okutie" (manufactured by Nippon Starch Chemical Co., Ltd.), and the like.

[0019] In the cosmetic composition of the present invention, the component (A) is a powder. Octenyl succinic acid starch ester metal salt becomes hydrophilic and gelled (so-called α-gelatinization or gelatinization) and loses its powdery state when heated to a relatively high temperature (for example, 60°C or higher), and may be used as a thickener. In the cosmetic composition of the present invention, when octenyl succinic acid starch ester metal salt is blended, it is characterized by being contained in a powdery state. Therefore, in the manufacturing process of the cosmetic composition of the present invention, the octenyl succinic acid starch ester metal salt is preferably used at a temperature of less than 60°C (more preferably less than 55°C).

[0020] In the cosmetic composition of the present invention, the mass ratio [(B) / (A)] of the content of the component (B) to the content of the component (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 above mass ratio is 0.45 or more, free component (A) not contained in the emulsion particles is less likely to be generated. Further, when the above mass ratio is 1.0 or less, oil floating (the oily component not contained in the emulsion particles floats to form an oil phase on the surface layer of the composition) is less likely to occur. In 100% by mass of the cosmetic composition of the present invention, the content of the component (A) 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.

[0021] [Component (B): It is liquid at 25°C and is an oily component selected from the group consisting of hydrocarbon oils, ester oils, silicone oils, and vegetable oils] Component (B) is an oily 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.

[0022] Component (B) is liquid at 25°C. Component (B) has fluidity at 25°C. The viscosity η measured at 25°C using a Brookfield type rotational viscometer for Component (B) is preferably 30,000 mPa·s or less (for example, 0.1 to 30,000 mPa·s), more preferably 1.0 to 10,000 mPa·s.

[0023] 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. When the above IOB value is within the above range, the adsorption action of the powder on the oil-water interface is exerted. The above IOB (Inorganicity Organicity Balance) value is the value obtained by dividing the inorganicity value of a substance by its organicity value. The IOB values of various substances can be determined, for example, with reference to the description in [Yoshio Koda, "Organic Conceptual Diagram: Basics and Applications", Sankyo Publishing Co., Ltd., 1984, pp. 11-17]. When a plurality of 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, it means the IOB value of the whole Component (B).

[0024] Examples of the above hydrocarbon oils include isoparaffin, light isoparaffin, light fluid isoparaffin, squalane (synthetic squalane, vegetable squalane, etc.), fluid isoparaffin, fluid paraffin, hydrogenated polyisobutene, isododecane, and the like.

[0025] Examples of the ester oil include isopropyl myristate, isopropyl palmitate, myristyl myristate, cetyl palmitate, 2-ethylhexyl palmitate, octyldodecyl myristate, isopropyl isostearate, cetyl 2-ethylhexanoate, glyceryl tri(2-ethylhexanoate), glyceryl tri(caprylic / capric acid), isononyl isononanoate, diisopropyl adipate, pentaerythrityl tetraoctanoate, diisostearyl malate, and the like.

[0026] Examples of the vegetable oil include macadamia nut oil, olive oil, palm oil, sunflower oil, jojoba oil, argan oil, and the like.

[0027] Examples of the silicone oil include dimethyl silicone oils such as dimethylpolysiloxane (dimethicone) and highly polymerized dimethylpolysiloxane; methylphenyl silicone oils such as methylphenylpolysiloxane, and the like.

[0028] Component (B) is preferably a liquid at 25°C and contains an oily component selected from the group consisting of hydrocarbon oil, ester oil, and vegetable oil. More preferably, 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 preferred.

[0029] 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, more preferably 0.05 to 10.0% by mass, based on 100% by mass of the cosmetic composition of the present invention. When the above content is 0.01% by mass or more, a pickering emulsion is more likely to form. When the above content is 20.0% by mass or less, oil floating can be further reduced, and the product can have a better appearance. The content of the above component (B) is the total content of all component (B) in the cosmetic composition of the present invention.

[0030] [Component (C): Pentylene Glycol] Component (C) is pentylene glycol (1,2 - pentanediol). The above - mentioned pentylene glycol is represented by, for example, PENTYLENE GLYCOL in INCI name. 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. However, even when the aqueous phase has a low ethanol concentration, it exhibits the effect of forming a Pickering emulsion of spherical emulsion particles with a relatively uniform size.

[0031] The content of component (C) in the cosmetic composition of the present invention is not particularly limited. However, with respect to 100% by mass of the cosmetic composition of the present invention, 0.5 to 5.0% by mass is preferable, and more preferably 1.0 to 5.0% by mass. When the above - mentioned content is 0.5% by mass or more, it becomes easier to form a Pickering emulsion of spherical emulsion particles with a uniform size. When the above - mentioned content is 5.0% by mass or less, the irritation feeling when applying the cosmetic composition to the face or the like can be further reduced.

[0032] [Component (D): Ethanol] Component (D) is ethanol. Component (D) is present in the aqueous phase of the Pickering emulsion and exhibits the effect of adjusting the polarity of the aqueous phase. In addition, it exhibits 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 when the content of component (D) is low, a Pickering emulsion of spherical emulsion particles with a relatively uniform size can be formed.

[0033] 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, based on 100% by mass of the cosmetic composition of the present invention. When the above content is 1.0% by mass or more, a pickering emulsion of spherical emulsion particles of uniform size is more likely to be formed. The upper limit value 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 or the like, for example, it may be 20.0% by mass or less, or 10.0% by mass or less, based on 100% by mass of the cosmetic composition of the present invention.

[0034] [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, based on 100% by mass of the cosmetic composition of the present invention.

[0035] [Other components] The cosmetic composition of the present invention may contain components other than components (A) to (E) as long as the effects of the present invention are not inhibited. As the components other than the above components (A) to (E), only one kind may be used, or two or more kinds may be used.

[0036] Examples of the components other than the above components (A) to (E) include lower alcohols other than component (D); polyhydric alcohols other than component (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.); ceramides, etc.

[0037] [Polyhydric alcohols other than component (C)] From the viewpoint of improving the moisturizing effect, etc., the cosmetic composition of the present invention may contain polyhydric alcohols other than component (C). Examples of the 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; glycerols such as glycerin, diglycerin, and polyglycerin; sugar alcohols such as xylitol, trehalose, maltitol, mannitol, sorbitol, erythritol (erythritol), arabitol, ribitol, galactitol, and glucitol. The content of the polyhydric alcohols other than component (C) in the cosmetic composition of the present invention is not particularly limited, but is preferably 3.0 to 40.0% by mass, more preferably 5.0 to 35.0% by mass, based on 100% by mass of the cosmetic composition of the present invention.

[0038] [Thickener] The cosmetic composition of the present invention may contain a thickening agent. By blending a thickening agent, the viscosity of the cosmetic composition can be increased, for example, emulsion particles can be suspended to enhance the aesthetic appearance. Examples of the thickening agent include acrylic thickening agents such as carboxyvinyl polymer, (acrylates / acrylic acid alkyl (C10-30)) cross-polymer (acrylic acid / methacrylic acid alkyl copolymer), acrylic acid alkyl copolymer (trade name "Aculyn 33A", etc.), (acrylates / methacrylic acid stearyl-20) copolymer (trade name "Aculyn 22", etc.), (acrylates / methacrylic acid behenyl-25) copolymer, and (acrylates / vinyl neodecanoate) cross-polymer; cellulose thickening agents such as methyl cellulose, ethyl cellulose, hydroxymethyl cellulose, hydroxyethyl cellulose, hydroxypropyl cellulose, carboxymethyl cellulose, hydroxypropyl methyl cellulose, and cellulose nanofibers; natural gum thickening agents such as xanthan gum, gelatin, guar gum, carrageenan, pectin, and locust bean gum. The content of the thickening agent in the cosmetic composition of the present invention is not particularly limited, but is preferably 0.01 to 2.0% by mass, more preferably 0.05 to 1.5% by mass, based on 100% by mass of the cosmetic composition of the present invention.

[0039] [Surfactant] Since the cosmetic composition of the present invention is a Pickering emulsion, an emulsion can be formed even 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 may be 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. Among them, from the viewpoint of further enhancing the formability of the Pickering emulsion, the cosmetic composition of the present invention preferably does not substantially contain a nonionic surfactant and an anionic surfactant. 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 preferably 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 above content is 0.1% by mass or less, irritation and stickiness to the skin derived from the nonionic surfactant and the anionic surfactant can be further reduced.

[0040] (Other details of the cosmetic composition) The properties of the cosmetic composition of the present invention are not particularly limited and may be any of liquid, gel, cream, wax, and solid. The cosmetic composition of the present invention is preferably liquid or gel.

[0041] The dosage form of the cosmetic composition of the present invention is not particularly limited, and 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 lotion dosage form and the gel dosage form.

[0042] 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, preferably 7000 mPa·s or less, and more preferably 5000 mPa·s or less from the viewpoint of ease of application. The above viscosity is measured using a viscometer under the conditions of using a No. 4 rotor, a rotation speed of 12 rpm, and 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.

[0043] The use of the cosmetic composition of the present invention is not particularly limited, and it can be used for skin (for example, face, neck, scalp, shoulders, body, arms, elbows, palms, backs of hands, legs, calves, knees, ankles, soles of feet, backs of feet, etc.) and hair. That is, the cosmetic composition of the present invention can be used as either a hair cosmetic or a skin cosmetic. Among them, the cosmetic composition of the present invention is preferably a skin cosmetic.

[0044] The cosmetic composition of the present invention is not particularly limited and can be produced by known or conventional methods. For example, a method of mixing the above components and stirring them using a known stirring device such as a disperser or a paddle mixer can be mentioned.

Examples

[0045] Hereinafter, the present invention will be specifically described with reference to Examples and Comparative Examples. The present invention is not limited only to the following Examples.

[0046] (Examples and Comparative Examples) The following compounding components were compounded (the compounding unit is mass%), and a cosmetic composition having the following composition was prepared by a conventional method. The compounding amounts in the table are shown as the compounding amounts of pure components (unit: mass%).

[0047] (Evaluation) The evaluation was conducted as follows. The evaluation was conducted by 3 professional evaluators.

[0048] (1) Formability of Pickering Emulsion 20 g of the cosmetic compositions obtained in the examples and comparative examples were filled into screw tubes with a capacity of 30 ml. The cosmetic compositions were visually observed both at rest (when the emulsion particles had settled) and during stirring (when the emulsion particles were dispersed), and evaluated according to the following criteria. <Evaluation Criteria> Good (〇): The particle size of the emulsion particles is uniform, and the proportion of spherical emulsion particles is large, so the appearance is excellent. Poor (×): The particle size of the emulsion particles is uneven, and / or the proportion of non-spherical emulsion particles is large, so the appearance is poor.

[0049] The results are shown in the table below.

[0050]

Table 1

[0051] As shown in the table, the cosmetic composition (example) of the present invention was a cosmetic composition with good formation of a pickering emulsion and excellent appearance. In addition, in the cosmetic composition (example) of the present invention, in the above evaluation, an oil layer (so-called oil floating) was not observed in the upper layer of the composition, and the appearance was good. On the other hand, in the cosmetic composition (example) of the comparative example, oil floating was clearly observed in the above evaluation, and in this regard, the appearance was also poor.

[0052] The formulation examples of the cosmetic composition of the present invention are shown below.

[0053]

Table 2

Claims

Claim 1 An oil-in-water pickering emulsion cosmetic composition containing the following component A, the following component B, the following component C, the following component D, and the following component E, wherein the IOB value of component B is 0 to 0.

45. Component A: Octenyl succinic acid starch ester metal salt Component B: An oily component that 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 Claim 2 The cosmetic composition according to claim 1, wherein the content of component C is 0.5 to 5.0% by mass. Claim 3 The cosmetic composition according to claim 1 or 2, wherein the content of component D is 1.0% by mass or more. Claim 4 The cosmetic composition according to claim 1 or 2, wherein the content of component B is 0.01 to 20.0% by mass. Claim 5 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.

Images