JP6929471B2 - Cosmetics - Google Patents

Description

The present invention relates to cosmetics. More specifically, the present invention relates to a three-layer cosmetic having a stable two-layer water layer and an oil layer.

Conventionally, from the viewpoint of enhancing functionality and aesthetics, multi-layer (multi-layer) cosmetics having an appearance separated into two or three layers have been known. As the most common two-layer cosmetics, two-layer cosmetics separated into an oil layer and an aqueous layer (see Patent Document 1) and two-layer cosmetics having an oil layer and an oil layer (see Patent Document 2) are known. ing. The three-layer cosmetics include, for example, a three-layer cosmetic having an oil layer, a surfactant layer and an aqueous layer (see Patent Documents 3 and 4), and an oil layer, a surfactant layer and a polyhydric alcohol layer. Layered cosmetics (see Patent Document 5), oil layer-oil layer-water layer three-layer cosmetics, and the like are known. In addition, there are many cosmetics called a two-layer type due to a powder sedimentation layer and an aqueous layer.

Japanese Unexamined Patent Publication No. 2013-139411 Japanese Unexamined Patent Publication No. 2004-115485 Japanese Unexamined Patent Publication No. 2005-206557 Japanese Unexamined Patent Publication No. 2008-290960 Japanese Unexamined Patent Publication No. 4-290810

However, in multi-layer cosmetics, it has been difficult to stably have two or more aqueous layers. Conventionally, a method of blending two or more different types of polymers into an aqueous layer and forming two or more aqueous layers by utilizing the excluded volume effect of the polymers has been known, but a sufficient excluded volume effect can be obtained. From the viewpoint of exerting it, a polymer having a large molecular weight and a relatively high concentration was blended. Therefore, such a composition having two or more aqueous layers did not have a preferable feeling of use as a skin cosmetic. Furthermore, cosmetics having two or more water layers and an oil layer have not been known so far.

Therefore, an object of the present invention is to provide a cosmetic having a stable presence of two water layers and an oil layer and having excellent aesthetics.

As a result of diligent studies to achieve the above object, the present inventor has made a makeup containing a specific dextran, a specific polyethylene glycol, and an electrolyte in a specific ratio, and further containing an ionic surfactant, water, and an oily component. According to the ingredients, it was found that two layers of water and an oil layer exist stably, and a cosmetic having excellent aesthetics can be obtained. The present invention has been completed based on these findings.

That is, the present invention contains the following component (A), the following component (B), the following component (C), the following component (D), the following component (E), and the following component (F), and the above component (F). The content ratio of the above component (A) is 2.0 to 10.0% by mass, the content ratio of the above component (B) is 2.0 to 10.0% by mass, and the above component ( Provided is a cosmetic having a content ratio of C) of 0.05 to 1.4% by mass.
Component (A): Dextran component having a number average molecular weight of 50,000 to 300,000 (B): Polyethylene glycol having a number average molecular weight of 4000 to 30,000 Component (C): Electrolyte component (D): Ionic surfactant component ( E): Water component (F): Oil component

The cosmetics preferably further contain the following component (G).
Component (G): One or more polyhydric alcohols selected from the group consisting of polyoxyalkylene alkyl glucosides, propylene glycol, dipropylene glycol, and polyethylene glycol having a number average molecular weight of 2000 or less.

It is preferable that the above-mentioned cosmetics do not substantially contain a nonionic surfactant.

According to the cosmetic of the present invention, a cosmetic having a stable presence of two water layers and an oil layer and having excellent aesthetics can be obtained. Therefore, the cosmetic of the present invention can be a cosmetic having excellent aesthetics and excellent usability. In particular, it is possible to suppress stickiness when applied to the skin.

It is the schematic which shows one Embodiment of the appearance of the cosmetic of this invention.

The cosmetic of the present invention contains at least dextran having a number average molecular weight of 50,000 to 300,000, polyethylene glycol having a number average molecular weight of 4000 to 30,000, an electrolyte, an ionic surfactant, water, and an oily component. In the present specification, dextran having a number average molecular weight of 50,000 to 300,000 is "component (A)", polyethylene glycol having a number average molecular weight of 4000 to 30,000 is "component (B)", and an electrolyte is "component (component)". C) ”, the ionic surfactant may be referred to as“ component (D) ”, water may be referred to as“ component (E) ”, and the oily component may be referred to as“ component (F) ”.

The cosmetic of the present invention preferably further contains one or more polyhydric alcohols selected from the group consisting of polyoxyalkylene alkyl glucosides, propylene glycol, dipropylene glycol, and polyethylene glycol having a number average molecular weight of 2000 or less. .. In addition, in this specification, "one or more polyhydric alcohols selected from the group consisting of polyoxyalkylene alkyl glucoside, propylene glycol, dipropylene glycol, and polyethylene glycol having a number average molecular weight of 2000 or less" is referred to as "component ( It may be called "G)".

That is, the cosmetic of the present invention contains at least the component (A), the component (B), the component (C), the component (D), the component (E), and the component (F). The cosmetic of the present invention preferably further contains the component (G). The cosmetic of the present invention may contain ingredients other than the above-mentioned ingredients (A) to (G). In addition, each component contained in the cosmetic of the present invention, for example, component (A), component (B), component (C), component (D), component (E), component (F), component (G), As each component such as and other components, only one kind may be used, or two or more kinds may be used.

When the cosmetic of the present invention is placed in a container and allowed to stand for a certain period of time, the appearance becomes a multi-layer type including two water layers and an oil layer (for example, a three-layer type of two water layers and one oil layer). More specifically, for example, as shown in FIG. 1, the cosmetic X of the present invention is a three-layer cosmetic having layers in the order of oil layer 1 / water layer 2 / water layer 3 in the container 4 from the top. It has become. For example, the aqueous layer 2 is an aqueous layer containing polyethylene glycol having a number average molecular weight of 4000 to 30,000, and the aqueous layer 3 is an aqueous layer containing dextran having a number average molecular weight of 50,000 to 300,000.

In the case of the three-layer type of oil layer / aqueous layer / aqueous layer, the cosmetic of the present invention becomes an emulsion when stirred in a container, so that it can be used as a cosmetic. In addition, the three-layer system having such a structure can suppress stickiness, sliminess, and irritation to the skin at the time of application, unlike skin cosmetics having a surfactant layer. Further, the three-layer type cosmetic having two oil layers has a problem that an oil film feeling occurs because the blending amount of the oily component is relatively large, but the cosmetic of the present invention also suppresses such a problem. can do. Further, the cosmetic of the present invention is excellent in reseparability into three layers after use after emulsification, and the interface of each layer appears after being allowed to stand for a certain period of time, and the appearance of the three layers is obtained again.

[Ingredient (A)]
The component (A) is dextran having a number average molecular weight of 50,000 to 300,000. As the component (A), only one kind may be used, or two or more kinds may be used.

The number average molecular weight of the component (A) is 50,000 to 300,000, preferably 50,000 to 220,000. When the number average molecular weight is 50,000 or more, the excluded volume effect on the component (B) becomes high, and a two-layer aqueous layer can be formed. When the number average molecular weight is 300,000 or less, stickiness when the cosmetic is applied to the skin can be suppressed, and the usability as a cosmetic is excellent.

In the present specification, the number average molecular weight can be measured by, for example, gel permeation chromatography (GPC).

As the component (A), a commercially available product can be used. Examples of commercially available products of the component (A) include the trade name "Polymer Dextran EH" and the trade name "Dextran 70" (all manufactured by Meito Sangyo Co., Ltd.).

The content ratio of the component (A) in the cosmetic of the present invention is 100% by mass with respect to 100% by mass of the total amount of the cosmetic of the present invention excluding the component (F) (that is, the total amount of each component other than the component (F)). It is 2.0 to 10.0% by mass, preferably 2.5 to 8.0% by mass, and more preferably 3.0 to 5.0% by mass. When the content ratio is 2.0% by mass or more, a two-layer aqueous layer can be stably formed. When the content ratio is 10.0% by mass or less, stickiness when the cosmetic is applied to the skin can be suppressed, and the usability as a cosmetic is excellent. The content ratio of the component (A) is the total of the content ratios of all the components (A) in the cosmetic of the present invention.

[Component (B)]
The component (B) is polyethylene glycol having a number average molecular weight of 4000 to 30,000. As the component (B), only one kind may be used, or two or more kinds may be used.

The number average molecular weight of the component (B) is 4,000 to 30,000, preferably 6,000 to 25,000, and more preferably 10,000 to 20,000. When the number average molecular weight is 4000 or more, the excluded volume effect on the component (A) becomes high, and a two-layer aqueous layer can be formed. When the number average molecular weight is 30,000 or less, stickiness when the cosmetic is applied to the skin can be suppressed, and the usability as a cosmetic is excellent.

As the component (B), a commercially available product can be used. Commercially available products of component (B) include, for example, product name "PEG # 20000", product name "PEG # 11000", product name "PEG # 6000" (all manufactured by NOF CORPORATION), and product name "Brownon PEG". -20000S "(manufactured by Aoki Yushi Kogyo Co., Ltd.) and the like.

The content ratio of the component (B) in the cosmetic of the present invention is 2.0 to 10.0% by mass, preferably 2.0 to 10.0% by mass, based on 100% by mass of the total amount of the cosmetic of the present invention excluding the component (F). It is 2.0 to 8.0% by mass, more preferably 2.0 to 5.0% by mass. When the content ratio is 2.0% by mass or more, a two-layer aqueous layer can be stably formed. When the content ratio is 10.0% by mass or less, stickiness when the cosmetic is applied to the skin can be suppressed, and the usability as a cosmetic is excellent. The content ratio of the above component (B) is the total of the content ratios of all the components (B) in the cosmetic of the present invention.

The cosmetic of the present invention contains the component (A) and the component (B) in the above-mentioned content ratios, respectively, and the water containing the component (A) due to the excluded volume effect of the component (A) and the component (B). It can be separated into a layer and an aqueous layer containing the component (B).

[Component (C)]
The component (C) is an electrolyte. By containing the component (C), the cosmetic of the present invention promotes the floating (creaming) of the oily component of the emulsion when the emulsion is formed by stirring and then allowed to stand for a certain period of time. The speed of coalescence can be adjusted, and it is excellent in aesthetics when returning to the multi-layer type. As the component (C), only one kind may be used, or two or more kinds may be used.

The component (C) is not particularly limited, and examples thereof include metal salts (for example, monovalent metal salts, divalent or higher polyvalent metal salts, etc.). The metal salt may be an inorganic salt or an organic salt. Examples of the metal salt include sodium salt, potassium salt, calcium salt, magnesium salt, zinc salt, ammonium salt, aluminum salt and the like. Specifically, the component (C) includes zinc paraphenol sulfonate, sodium chloride, potassium chloride, calcium chloride, magnesium chloride, magnesium sulfate, myoban, sodium carbonate, sodium hydrogen carbonate, potassium hydrogen carbonate, ammonium chloride, and phosphorus. Examples thereof include sodium phosphate, disodium hydrogen phosphate, sodium dihydrogen phosphate, sodium citrate (trisodium citrate), disodium edetate, and potassium aluminum sulfate. Further, benzalkonium chloride and chlorohydroxyaluminum can also be mentioned.

The content ratio of the component (C) in the cosmetic of the present invention is 0.05 to 1.4% by mass, preferably 0.05 to 1.4% by mass, based on 100% by mass of the total amount of the cosmetic of the present invention excluding the component (F). It is 0.1 to 1.0% by mass, more preferably 0.2 to 0.8% by mass. When the content ratio is 0.05% by mass or more, the time until each layer is separated after emulsification of the cosmetic can be shortened. In addition, creaming can be promoted, the balance between the emulsion coalescence speed and the creaming speed becomes appropriate, and coalescence occurs after the proper creaming, so that the oily component produced by coalescence adheres to the container wall surface. It can suppress the problem and has excellent aesthetics when returning to the multi-layer type. When the content ratio is 1.4% by mass or less, the creaming speed is appropriately slowed down, so that the time until each layer is separated is not too short, and the usability of the cosmetic is improved. The content ratio of the component (C) is the total of the content ratios of all the components (C) in the cosmetic of the present invention.

[Component (D)]
Component (D) is an ionic surfactant. Examples of the component (D) include an anionic surfactant, a cationic surfactant, and an amphoteric surfactant. The component (D) can promote the coalescence of the emulsion. In the cosmetic of the present invention, it is presumed that the component (D) is oriented toward the oil-water interface to weaken the film strength at the interface, and the emulsification rate of the emulsion can be improved. As the component (D), only one kind may be used, or two or more kinds may be used.

Examples of the anionic surfactant include higher fatty acid soap, alkyl sulfate, alkyl phosphate, polyoxyethylene alkyl ether sulfate, polyoxyethylene alkyl phenyl ether sulfate, alkyl ether phosphate, and alkyl ether carboxylic acid. Acid salt, acylmethyl taurine salt, N-acyl-N-methyl-β-alanine salt, N-acylglycine salt, N-acylglutamate salt, polyoxyethylene alkylcarboxylate, alkylphenyl ether sulfonate, alkylsulfosuccinate Examples thereof include acids and salts thereof, N-acylsarcosine and salts thereof, polyoxyethylene palm oil fatty acid monoethanolamide sulfate and the like.

Examples of the cationic surfactant include amino acid-based cationic surfactants, alkylamine salts, fatty acid amidamine salts, amine salts such as ester-containing tertiary amine salts, monoalkyl-type quaternary ammonium salts, and dialkyl-type quaternary ammonium salts. Quaternary ammonium salts, trialkyl quaternary ammonium salts, alkyl quaternary ammonium salts such as benzalconium quaternary ammonium salts, cyclic quaternary ammonium salts such as alkylpyridinium salts, benzethonium chloride and the like. Be done. Among them, a cationic surfactant having a relatively bulky structure is preferable, and for example, benzalkonium chloride, N-palm oil fatty acid acyl-L-arginine ethyl / DL-pyrrolidone carboxylate, and the like are preferable.

Examples of the amphoteric surfactant include glycine-type amphoteric surfactants such as alkylglycine salt, carboxymethyl glycine salt, and N-acylaminoethyl-N-2-hydroxyethyl glycine salt, alkylaminopropionate, and alkyliminodipropionic acid. Aminopropionic acid-type amphoteric surfactants such as salts, alkyldimethylaminoacetate betaine, aminoacetate betaine-type amphoteric surfactants such as fatty acid amidepropyldimethylaminoacetate betaine, sulfobetaine-type amphoteric surfactants such as alkylhydroxysulfobetaine, etc. Can be mentioned.

As the component (D), benzalconium chloride and / or N-coconut oil fatty acid acyl-L-arginine ethyl DL-pyrrolidone carboxylate is preferable, and N-coconut oil fatty acid acyl-L-arginine ethyl is particularly preferable. DL-pyrrolidone carboxylate.

The content ratio of the component (D) in the cosmetic of the present invention is not particularly limited, but is 0.005 to 0.1% by mass with respect to 100% by mass of the total amount of the cosmetic of the present invention excluding the component (F). Is preferable, and more preferably 0.008 to 0.05% by mass, still more preferably 0.01 to 0.05% by mass. When the content ratio is 0.005% by mass or more, the coalescence of the emulsion can be further promoted, and the time until each layer is separated after the cosmetic is emulsified by stirring can be shortened. .. When the content ratio is 0.1% by mass or less, it is possible to prevent the coalescence rate of the emulsion from becoming too fast, and to maintain the emulsion state for a certain period of time after emulsifying the cosmetic by stirring. .. Therefore, the usability of the cosmetic is improved. And, within the above range, the unification rate of the emulsion from the emulsion state of the cosmetic can be optimized. The content ratio of the component (D) is the total of the content ratios of all the components (D) in the cosmetic of the present invention.

[Component (E)]
The component (E) is water, and although it is not particularly limited, purified water is preferable. The component (E) is a component that serves as a medium for the two aqueous layers in the cosmetic of the present invention. The content ratio of the component (E) in the cosmetic of the present invention is preferably 60.0 to 95.0% by mass with respect to 100% by mass of the total amount of the cosmetic of the present invention excluding the component (F). , More preferably 70.0 to 90.0% by mass.

[Component (F)]
The component (F) is an oily component. Examples of the component (F) include vegetable oil, ester oil, silicone oil, hydrocarbon oil, wax, higher alcohol and the like. Ingredient (F) forms an oil layer in the cosmetic of the present invention. As the component (F), only one kind may be used, or two or more kinds may be used.

Examples of the vegetable oils include macadamia nut oil, eucalyptus oil, palm oil, avocado oil, saflower oil, olive oil, palm oil, palm kernel oil, kukui nut oil, shea butter, cacao butter, almond oil, and sunflower oil. , Rosehip oil, olive squalane, camellia oil, kiwi fruit seed oil, camellia oil, apricot 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, sokei flower wax, camellia oil, these hydrogenated additives (eg hydrogenated castor oil, hydrogenated jojoba oil, hydrogenated palm oil, hydrogenated avocado oil, Hydrogenated soybean oil, etc.) and the like.

Examples of the ester oil include ethyl oleate, isopropyl myristate, isopropyl palmitate, myristyl myristate, cetyl palmitate, 2-ethylhexyl palmitate, octyldodecyl myristate, isopropyl isostearate, propylene glycol isostearate, 2-. Cetyl ethylhexanoate, glyceryl tri2-ethylhexanoate, glyceryl tri (caprylic acid / capric acid), isononyl isononanoate, diisopropyl adipate, pentaerythrityl tetraoctanoate, pentaerythrit tetraisostearate, diisostearyl malate , Erythrityl triethylhexarate, 2-ethylhexyl hydroxystearate, hexa (hydroxystearic acid / stearic acid / logonic acid) dipentaerythrityl, tetra (hydroxystearic acid / isostearic acid) dipentaerythrityl, dipentaerythrityl hexahydroxystearate, (ethylhexanoic acid / stearic acid) Examples thereof include acid / adipic acid) glyceryl, tri (caprylic acid / capric acid / myristic acid / stearic acid) glyceryl, hexa (bechenic acid / benzoic acid / ethylhexanoic acid) dipentaerythrityl, alkyl benzoate (C12-15) and the like.

The silicone oil is not particularly limited, but for example, dimethyl silicone oil such as methylpolysiloxane and highly polymerized methylpolysiloxane; methylphenylsilicone oil such as methylphenylpolysiloxane; methylcyclopolysiloxane, octamethylcyclotetrasiloxane, and the like. Cyclic silicone oils such as decamethylcyclopentasiloxane and dodecamethylcyclohexasiloxane; aminopropylmethylsiloxane / dimethylsiloxane copolymer, aminoethylaminopropylsiloxane / dimethylsiloxane copolymer, aminoethylaminopropylmethylsiloxane / dimethylsiloxane Amino-modified silicones such as polymers, carboxy-modified silicones, fatty acid-modified silicones, alcohol-modified silicones, aliphatic alcohol-modified silicones, epoxy-modified silicones, fluorine-modified silicones, alkyl-modified silicones and other modified silicones; methylhydrogenpolysiloxane, dimethiconol, etc. Can be mentioned.

Examples of the hydrocarbon oil include α-olefin oligomer, petrolatum, isoparaffin, light isoparaffin, light liquid isoparaffin, squalane, synthetic squalane, vegetable squalane, liquid isoparaffin, liquid paraffin, hydrogenated polyisobutene, hydrogenated (tetradecenyl /). Methylpentadecene), isododecane and the like.

Examples of the wax include carnauba wax, candelilla wax, beeswax, rice wax, cellac wax, whale wax, lanolin, sunflower seed wax and the like.

Examples of the higher alcohol include cetyl alcohol, stearyl alcohol, isostearyl alcohol, myristyl alcohol, 2-octyldodecanol, oleyl alcohol and the like.

The content ratio of the component (F) in the cosmetic of the present invention is not particularly limited, but is preferably 5.0% by mass or more, more preferably 7.0, with respect to 100% by mass of the total amount of the cosmetic of the present invention. It is mass% or more. When the content ratio is 5.0% by mass or more, the formation of the oil layer can be sufficiently confirmed visually. The content ratio is preferably 60.0% by mass or less, more preferably 50.0% by mass or less. When the content ratio is 60.0% by mass or less, the oil film feeling and stickiness derived from the oily component can be suppressed, and the feeling of use as a cosmetic is excellent. The content ratio of the above component (F) is the total of the content ratios of all the components (F) in the cosmetic of the present invention.

[Component (G)]
The component (G) is one or more polyhydric alcohols selected from the group consisting of polyoxyalkylene alkyl glucosides, propylene glycol, dipropylene glycol, and polyethylene glycol having a number average molecular weight of 2000 or less. When the component (G) is contained, the cosmetic of the present invention improves the separation rate of the two layers of water. As the component (G), only one kind may be used, or two or more kinds may be used.

The number average molecular weight of polyethylene glycol that can be used as the component (G) is 2000 or less, preferably 200 to 1800, and more preferably 400 to 1600.

As the polyoxyalkylene alkyl glucoside, for example, a polyoxyalkylene (for example, ethylene oxide, propylene oxide, etc.) added to the alkyl glucoside can be used. The average number of moles of the polyoxyalkylene added is preferably about 1 to 20 moles. The alkyl group in the polyoxyalkylene alkyl glucoside is preferably an alkyl group having 1 to 4 carbon atoms, and examples thereof include a methyl group, an ethyl group, a propyl group and an isopropyl group. As the polyoxyalkylene alkyl glucoside, polyoxyalkylene methyl glucoside is particularly preferable.

As the polyoxyalkylene methylglucoside, polyoxyethylene methylglucoside and polyoxypropylene methylglucoside are preferable, and specifically, polyoxyethylene (10) methylglucoside, polyoxyethylene (20) methylglucoside and polyoxypropylene ( 10) Methylglucoside, polyoxypropylene (20) methylglucoside and the like can be mentioned.

The content ratio of the component (G) in the cosmetic of the present invention is preferably 1.0 to 30.0% by mass, more preferably 1.0 to 30.0% by mass, based on 100% by mass of the total amount of the cosmetic of the present invention excluding the component (F). Is 2.0 to 20.0% by mass, more preferably 4.0 to 15.0% by mass. When the content ratio is 1.0% by mass or more, the separation rate of the two aqueous layers can be further improved. When the content ratio is 30.0% by mass or less, stickiness can be suppressed. The content ratio of the above component (G) is the total of the content ratios of all the components (G) in the cosmetic of the present invention.

The cosmetic of the present invention preferably contains substantially no nonionic surfactant. In addition, "substantially not contained" means that it is not positively blended, and it is excluded, for example, when it is inevitably present. Specifically, the content ratio of the nonionic surfactant in the cosmetic of the present invention is preferably 0.05% by mass or less with respect to 100% by mass of the total amount of the cosmetic of the present invention excluding the component (F). , More preferably 0.01% by mass or less, still more preferably 0.005% by mass or less. This is because the nonionic surfactant acts to inhibit the coalescence and creaming of the emulsion when returning from the emulsion state cosmetic to the multi-layer type. The content ratio of the nonionic surfactant is the total of the content ratios of all the nonionic surfactants in the cosmetic of the present invention.

Examples of the nonionic surfactant include sorbitan fatty acid ester, glycerin fatty acid ester, and alkylene oxide adducts thereof, polyoxyalkylene alkyl ether, polyoxyalkylene fatty acid ester, polyoxyalkylene alkyl phenol, and polyoxyethylene sorbit fatty acid ester. , Polyoxyethylene alkylphenyl formaldehyde condensate, polyoxyethylene sterol and its derivatives, polyoxyethylene lanolin and its derivatives, polyoxyethylene beeswax derivatives, sugar esters, polyoxyethylene hydrogenated castor oil, polyoxyethylene castor oil, etc. Can be mentioned.

[Other ingredients]
The cosmetic of the present invention may contain components (other components) other than the above components (A) to (G) as long as the object of the present invention is not impaired. The other ingredients are not particularly limited, and examples thereof include ingredients usually used in cosmetics and quasi-drugs. Specifically, for example, thickeners such as carboxyvinyl polymers, acrylate / alkyl methacrylate copolymers, hydroxymethyl cellulose, hydroxypropyl methyl cellulose, and xanthan gum; moisturizers; bactericides; pearlizing agents; glycyrrhizinic acid and salts thereof. Anti-inflammatory agents such as; refreshing agents such as menthol; fragrances; ultraviolet absorbers; antioxidants; film-forming polymer compounds; powders; pigments; pigments; vitamins; amino acids; astringents; whitening agents; animal and plant extracts Things; acids; alkalis and the like.

The use of the cosmetic of the present invention is not particularly limited, and is used for skin (skin) (for example, face, neck, scalp, shoulder, body, arm, elbow, palm, back of hand, thigh, calf, knee, ankle, foot). It can be used for both insteps, soles, etc.) and for hair. Since the cosmetic of the present invention can be used as a cleansing cosmetic by containing the ingredient (F), it is preferably a skin cosmetic. Moreover, since the cosmetic of the present invention can be used as a hair oil by containing the component (F), it may be a cosmetic for hair.

The cosmetic of the present invention is not particularly limited, and can be produced by a known or conventional method. For example, each of the above components can be mixed and stirred with a homomixer, paddle mixer or the like for production.

The cosmetic of the present invention is a cosmetic using water [component (E)] as a medium, and has a dextran [component (A)] having a number average molecular weight of 50,000 to 300,000 and polyethylene having a number average molecular weight of 4000 to 30,000. By containing glycol [ingredient (B)] in a specific ratio, the exclusion volume effect of the ingredient (A) and the ingredient (B) is improved while maintaining the excellent usability of the cosmetic, and the ingredient (A) is added. It is possible to form a two-layered aqueous layer, that is, an aqueous layer containing the aqueous layer and an aqueous layer containing the component (B). Then, an oil layer is formed by blending the oily component [component (F)], and a multi-layer cosmetic having two water layers and an oil layer can be obtained. From the viewpoint of aesthetics, the cosmetic of the present invention is agitated to form an emulsion when the cosmetic is used, and after use, the oil layer and the two water layers are separated to form a multi-layered form again. Is important from. Therefore, by blending the electrolyte [component (C)] in a specific ratio, the creaming of the emulsion is promoted, and by further blending the ionic surfactant [component (D)], the emulsion is integrated. Promote to balance creaming speed and coalescence speed. As a result, when returning to the multi-layer type, creaming is more likely to occur preferentially than coalescence, and adhesion of the coalesced oily component to the container wall surface can be suppressed, which is also excellent in aesthetics. Can be.

Hereinafter, the present invention will be described in more detail based on Examples, but the present invention is not limited to these Examples. The blending amount shown in the table is the blending amount of each component (that is, the blending amount of the active ingredient in each raw material, so-called pure content), and is represented by "mass%" unless otherwise specified.

Examples 1-22, Comparative Examples 1-9
Using each ingredient shown in the table, each cosmetic of Example and Comparative Example was prepared by a conventional method.

The main ingredients listed in the table are as follows.

<Ingredient (A)>
Dextran 70: Product name "Dextran 70", manufactured by Meito Sangyo Co., Ltd., number average molecular weight 54000-85000
Polymer Dextran EH: Product name "Polymer Dextran EH", manufactured by Meito Sangyo Co., Ltd., number average molecular weight 178,000-217,000
<Ingredient (B)>
PEG4000: Trade name "PEG # 4000", manufactured by NOF CORPORATION, number average molecular weight 4000
PEG6000: Trade name "PEG # 6000", manufactured by NOF CORPORATION, number average molecular weight 6000
PEG10000: Trade name "Brownon PEG-10000", manufactured by Aoki Yushi Kogyo Co., Ltd., number average molecular weight 10000
PEG20000: Trade name "Brownon PEG-20000S", manufactured by Aoki Yushi Kogyo Co., Ltd., number average molecular weight 20000
<Component (C)>
Sodium chloride: Product name "Nakuru M", manufactured by Naikai Salt Industries Co., Ltd. <Ingredient (D)>
N-coconut oil fatty acid acyl-L-arginine ethyl DL-pyrrolidone carboxylate: trade name "CAE", manufactured by Ajinomoto Co., Ltd. <Ingredient (F)>
Dimethicone: Product name "XIAMETER PMX-200 SILICONE FLUID 1.5CS", manufactured by Toray Dow Corning Co., Ltd., Methylpolysiloxane Light isoparaffin: Product name "Marcazole R", Sunflower oil manufactured by Maruzen Petrochemical Co., Ltd .: Product name "Hioleic" Sunflower oil, OLEOMONTERREAL S.A. L. Sunflower seed oil liquid paraffin manufactured by the company: Trade name "CARNATION", Sonneborn Inc. Liquid Isoparaffin manufactured by NOF CORPORATION: Brand name "Pearl Ream EX", manufactured by NOF CORPORATION <Ingredient (G)>
Polyoxypropylene methylglucoside: Trade name "McBiobride MG-10P", manufactured by NOF CORPORATION <Other ingredients>
Dextran 40: Product name "Dextran 40", manufactured by Meito Sangyo Co., Ltd., number average molecular weight 31000-45000

(evaluation)
Each cosmetic obtained in Examples and Comparative Examples was evaluated as follows. The evaluation results are shown in the table.

(1) Separation speed 100 ml of each cosmetic obtained in Examples and Comparative Examples is filled in a polyethylene terephthalate bottle container (capacity: 150 ml), shaken sufficiently, and then the layers are separated from immediately after to 10 minutes later. The behavior was visually observed, and the speed of layer separation was judged according to the following criteria.
[Criteria for separation speed]
○ (Good): The speed at which the oil layer, the water layer, and the water layer are divided into three layers is practically appropriate.
× (defective): The speed of dividing into three layers is too fast, and separation occurs before applying the cosmetic. Or, the speed of dividing into three layers is slow, and the aesthetics are inferior.

(2) Appearance After the evaluation of (1), the appearance was visually observed 3 hours later, and the appearance was judged according to the following criteria.
[Appearance criteria]
○ (Good): Divided into three layers: oil layer, water layer, and water layer. Moreover, there is no obvious stain on the wall surface due to the adhesion of oil droplets.
× (defective): Not divided into three layers. And / or, oil droplets are clearly attached to the wall surface, and dirt is seen.

(3) Usability (stickiness)
After sufficiently shaking each of the cosmetics obtained in Examples and Comparative Examples, they were applied to the inner part of the upper arm, and the stickiness immediately after application was judged according to the following criteria.
[Criteria for usability (stickiness)]
○ (Good): There is little stickiness or there is no stickiness, and there is no problem in practical use.
× (defective): Obviously sticky and unpleasant for practical use.

The cosmetic (Example) of the present invention has a practically appropriate separation rate, and after separation, it can be visually confirmed that the cosmetic is divided into three layers, an oil layer, an aqueous layer, and an aqueous layer, and oil droplets are formed on the wall surface. No obvious stains due to adhesion were seen, and the aesthetics were excellent. It was also excellent in usability. On the other hand, when dextran having a number average molecular weight of less than 50,000 was used instead of the component (A) (Comparative Example 1), and polyethylene glycol having a number average molecular weight of less than 4000 was used instead of the component (B) (comparison). Example 2), when the content ratio of the component (A) is low (Comparative Example 3), when the content ratio of the component (B) is low (Comparative Example 5), and when the component (D) is not blended (Comparative Example 9). In any of the above, the speed of division into three layers was slow, and it could not be visually confirmed that the three layers were divided into an oil layer, an aqueous layer, and an aqueous layer even after 3 hours.

In both the case where the content ratio of the component (A) is high (Comparative Example 4) and the case where the content ratio of the component (B) is high (Comparative Example 6), it is evaluated that the stickiness is clearly felt and the usability is inferior. Was done.

When the component (C) is not blended (Comparative Example 7), after 3 hours, it was visually confirmed that the component (C) was divided into three layers, an oil layer, an aqueous layer, and an aqueous layer, but the separation rate was slow and the oil on the wall surface. Drops were clearly attached. When the content ratio of the component (C) is high (Comparative Example 8), the separation rate is too fast, and separation may occur before applying the cosmetic.

X Cosmetics of the present invention 1 Oil layer 2 Water layer 3 Water layer 4 Container

Claims (3)

A cosmetic containing the following component (A), the following component (B), the following component (C), the following component (D), the following component (E), and the following component (F), excluding the above component (F). The content ratio of the component (A) is 2.0 to 10.0% by mass, the content ratio of the component (B) is 2.0 to 10.0% by mass, and the content ratio of the following component (C) is relative to the total amount. Cosmetics in an amount of 0.05 to 1.4% by mass.
Component (A): Dextran component having a number average molecular weight of 50,000 to 300,000 (B): Polyethylene glycol having a number average molecular weight of 4000 to 30,000 Component (C): Electrolyte component (D): Ionic surfactant component ( E): Water component (F): Oil component The cosmetic according to claim 1, further containing the following component (G).
Component (G): One or more polyhydric alcohols selected from the group consisting of polyoxyalkylene alkyl glucosides, propylene glycol, dipropylene glycol, and polyethylene glycol having a number average molecular weight of 2000 or less. The cosmetic according to claim 1 or 2, which does not substantially contain a nonionic surfactant.

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