JP7510584B2 - Two-layered cosmetics - Google Patents

Description

The present invention relates to a two-layer cosmetic material.

In recent years, cosmetics are expected to not only perform well, but also have a beautiful appearance and a sophisticated design. Among these, two-layer cosmetics, in which the oil layer and the water layer are separated, excel in both beauty of appearance and functionality.

Currently, two-layered cosmetics are used in various forms such as cleansing agents, hair cosmetics, etc. For example, Patent Document 1 discloses a two-phase type hair cosmetic in which the aqueous phase contains a water-soluble polymer compound and dimethicone copolyol, and the oil phase contains pentaerythritol tetra-2-ethylhexanoate. Patent Document 2 discloses a liquid two-phase type cosmetic that contains a coating forming agent such as polyvinylpyrrolidone as a separating agent.
Furthermore, Patent Document 3 discloses that a multi-layered cosmetic composition consisting of two or more layers is effective in stably blending active ingredients such as carotenoids.

Such two-layer cosmetic compositions usually have an oil layer on top and an aqueous layer on the bottom, and are used by applying the composition to the skin etc. after being homogenized by shaking. Two-layer cosmetic compositions are known to have an emollient effect from the oil and a moisturizing effect from the water-soluble moisturizing ingredients, and are known to be light to use and blend well with the skin.

JP 2002-509556 A JP 2016-050184 A JP 2018-058829 A

As mentioned above, two-layer cosmetics usually have an oil layer on top and an aqueous layer on the bottom, and all of the products look similar, so they are no longer unique in terms of aesthetic appearance.

Therefore, the objective of the present invention is to provide a cosmetic product that has an oil layer with a characteristic shape and has an excellent aesthetic appearance.

That is, the present invention, which solves the above-mentioned problems, provides a two-layer cosmetic preparation in which an oil layer and an aqueous layer are separated, and the oil layer exists as one or more spherical layers.
The two-layer cosmetic composition of the present invention has a spherical oil layer separated from the aqueous layer, unlike conventional cosmetic compositions, and has an excellent appearance.

In a preferred embodiment of the present invention, the oil layer is a sedimentary layer.
Since oil has a lower specific gravity than water, the oil is usually in the upper layer in such a two-layered cosmetic composition, but when the oil is in the upper layer, it is hidden by the lid of the container, which is not very desirable in terms of appearance.
In the present invention, since the oil layer is a sedimentary layer, the spherical oil layer can be visually confirmed, resulting in a more aesthetically pleasing appearance.

In a preferred embodiment of the present invention, the specific gravity of the composition constituting the oil layer at a product temperature of 25°C is greater than the specific gravity of the composition constituting the aqueous layer at a product temperature of 25°C.
When the specific gravity of the composition constituting the oil layer at a product temperature of 25° C. is greater than the specific gravity of the composition constituting the water layer at a product temperature of 25° C., sedimentation of the oil layer becomes possible.

In a preferred embodiment of the present invention, the difference in specific gravity between the composition constituting the oil layer and the composition constituting the aqueous layer at a product temperature of 25° C. is 0.001 or more.
By setting the specific gravity difference at a product temperature of 25°C between the composition constituting the oil layer and the composition constituting the aqueous layer within the above-mentioned range, sedimentation of the oil layer and spheronization of the oil layer can be stabilized.

In a preferred embodiment of the present invention, the composition constituting the oil layer contains an amphipathic oil.
By including an amphipathic oil agent, the sedimentation of the oil layer and the sphering of the oil layer can be further stabilized.

In a preferred embodiment of the present invention, the oil layer and/or the water layer are transparent or translucent.

In a preferred embodiment of the present invention, the oil layer and the water layer are different in color.

Further, the present invention for solving the above-mentioned problems provides a container-packed cosmetic in which the above-mentioned two-layer cosmetic is packed in a transparent or translucent container,
When the container-packed cosmetic is left to stand, the aqueous layer and the oil layer are separated,
When the container-packed cosmetic is shaken, the aqueous layer and the oil layer are mixed together,
When the two-layer cosmetic is allowed to stand after shaking, the oil layer and the aqueous layer become separated, and the oil layer becomes a spherical layer, which is a packaged cosmetic.
The present invention can be homogenized by shaking when in use, and the appearance can be enjoyed both before and after use.

The two-layered cosmetic product and containerized cosmetic product of the present invention have excellent aesthetic appearance.

1 is a photograph as a substitute for a drawing of a two-layer cosmetic composition when left to stand in Example 1. (a) shows a case where there is one oil layer, and (b) shows a case where there are multiple oil layers. 1 is a photograph of the two-layer cosmetic immediately after shaking in Example 1. 1A is a photograph showing the two-layer cosmetic composition of Example 1 that was left to stand for 10 minutes after shaking (a), for 30 minutes (b), and for 1 hour (c).

<1> Two-layer Cosmetic The two-layer cosmetic of the present invention is separated into an oil layer and an aqueous layer, and the oil layer exists as one or more spherical layers.
Hereinafter, when the cosmetic preparation is separated into two layers, all components contained in the oil layer are collectively referred to as the "composition constituting the oil layer," and all components contained in the aqueous layer are collectively referred to as the "composition constituting the aqueous layer."
Moreover, each component contained in the composition constituting the oil layer is referred to as an "oil layer component," and each component contained in the composition constituting the water layer is referred to as an "aqueous layer component."

In the present invention, the difference in specific gravity between the composition constituting the oil layer and the composition constituting the water layer at a product temperature of 25°C is 0.001 or more, and it is preferable that the specific gravity of the composition constituting the oil layer is greater than the specific gravity of the composition constituting the water layer. The difference in specific gravity between the composition constituting the water layer and the composition constituting the oil layer is preferably 0.005 or more, more preferably 0.007 or more.

In the present invention, the specific gravity of the composition constituting the oil layer at a product temperature of 25°C is preferably 0.900 or more, more preferably 0.920 or more, and even more preferably 0.950 or more.

In the present invention, the specific gravity of the composition constituting the aqueous layer at a product temperature of 25°C is preferably 0.900 or more, and more preferably 0.920 or more.

In the present invention, it is preferable that the specific gravity of the composition constituting the oil layer at a product temperature of 25°C is greater than the specific gravity of the composition constituting the water layer at a product temperature of 25°C.

The specific gravities of the compositions constituting the oil layer and the water layer change depending on temperature. Since the rate of change in the specific gravity of the composition constituting the oil layer is higher than that of the water layer, the specific gravities of the composition constituting the oil layer and the composition constituting the water layer may be reversed, and the oil layer that has settled may become the upper layer. This is also an embodiment of the present invention.
In a preferred embodiment of the present invention, the specific gravity of the composition constituting the oil layer at a product temperature of 25°C is greater than the specific gravity of the composition constituting the aqueous layer at a product temperature of 25°C.
By adopting such a configuration, under conditions in which a two-layer cosmetic composition is generally used, the spherical oil layer settles, resulting in an excellent aesthetic appearance.

In the present invention, the mass ratio of the composition constituting the oil layer to the composition constituting the aqueous layer is not particularly limited, but is preferably 1:99 to 30:70, and more preferably 2:98 to 20:80.

The two-layer cosmetic composition of the present invention can be prepared by appropriately mixing the specified components. For example, it can be prepared by separately preparing a composition constituting the oil layer and a composition constituting the aqueous layer, which will be described later, and then mixing the two compositions.

The present invention also relates to a container-packed cosmetic composition in which the two-layer cosmetic composition is packed in a transparent or translucent container.
The container-packed cosmetic of the present invention separates into an oil layer and an aqueous layer when left to stand, with the oil layer existing in the form of globules.
The container-packed cosmetic is shaken when used to mix the oil layer and the water layer. When the container-packed cosmetic is left to stand after use, it separates again into the oil layer and the water layer, and the oil layer becomes spherical. When left to stand after shaking, multiple small spherical oil layers appear, which combine over time to form large spherical oil layers.

The size of the spherical oil layer varies depending on the volume, but if the composition constituting the oil layer and the composition constituting the water layer are packed in a 25 ml screw vial with a mass ratio of 2:98 to 20:80, and one large oil layer is formed, the diameter will be approximately 0.2 to 1.2 cm.

Oil layers bond when multiple oil layers come into contact with each other, but if the container has a large base surface area and the oil layers do not come into contact with each other, the mixture may stabilize with multiple oil layers present.

In other words, the diameter of the oil layer at rest can be controlled according to the bottom area of the container in which the cosmetic is filled.
For example, if you want to obtain a two-layer cosmetic containing multiple small oil layers, you should use a container with a wide base area, and if you want to obtain one large oil layer, you should use a container with a narrow base area.

The two-layer cosmetic composition of the present invention can be used as skin care cosmetics such as lotions, milky lotions, and serums, nail care cosmetics such as nail oils, hair care cosmetics such as hair care products and hair oils, and cosmetics for body lotions.

<2> Oil Layer Component As the oil layer component, oil agents usually used in cosmetics can be used.
For example, animal and vegetable oils such as jojoba oil, olive oil, sunflower oil, shark liver oil, and liquid lanolin; hydrocarbon oils such as liquid paraffin, light liquid isoparaffin, hydrogenated polyisobutene, and squalane; diisostearyl malate, octyldodecyl lactate, isotridecyl isononanoate, isopropyl isostearate, isocetyl myristate, octyldodecyl myristate, isocetyl palmitate, polyglyceryl-6 octacaprylate, neopentyl glycol dicaprate, cyclohexane Bisethoxydiglycol-1,4-dicarboxylate, polyglyceryl-10 (eicosandioic acid/tetradecanedioic acid), bisethoxydiglycol succinate, di(caprylic/capric)glyceryl succinate, diethoxyethyl succinate, propylene glycol dicaprate, pentaerythrityl tetra-2-ethylhexanoate, polyglyceryl-6 octacaprylate, sorbitan sesquiisostearate, sorbitan sesquioleate, polyglyceryl-2 isostearate, diisostearyl Examples of the oil include ester oils such as polyglyceryl-2 phosphate, polyhydroxystearic acid, cholesteryl hydroxystearate, dipentaerythrityl hexahydroxystearate, ethylhexyl hydroxystearate, glyceryl tri-2-ethylhexanoate, and glyceryl tri(caprylic acid/capric acid), ether oils such as alkyl-1,3-dimethylbutyl ether, nonylphenyl ether, polyoxypropylene polyglyceryl ether, polyoxybutylene polyoxyethylene polyoxypropylene glyceryl ether, and polyoxyethylene polyoxypropylene dimethyl ether, silicone oils such as methylcyclopolysiloxane, methylpolysiloxane, methylphenylpolysiloxane, methylhydrogenpolysiloxane, cyclopentasiloxane, methyltrimethicone, and bisphenylpropyldimethicone, and fluorine-based oils such as perfluoropolyether, hydrofluoroether, and perfluorooctyltriethoxysilane.
Furthermore, in addition to the above-mentioned oil agents, ultraviolet absorbers such as ethylhexyl methoxycinnamate, avobenzones, dimethicodiethyl benzalmalonate, octocrylene, ethylhexyl salicylate, homosalate, and bisethylhexyloxyphenol methoxydiphenyl triazine can also be blended as the oil layer component of the present invention.

When ethanol is blended as an aqueous layer component (described later), the specific gravity of the aqueous layer becomes relatively small, so that sedimentation of the oil layer is possible even if an oil agent with a comparatively low specific gravity is used as the oil agent.
On the other hand, when the aqueous layer does not contain ethanol, the oil layer can be precipitated by using an oil having a high specific gravity. For example, it is preferable to use an oil having a high specific gravity, such as pentaerythrityl tetra-2-ethylhexanoate, polyglyceryl-2 isostearate, polyglyceryl-6 octacaprylate, or ethylhexyl methoxycinnamate.

The oil agent used in the present invention preferably contains an amphipathic oil agent. Specific examples include amphipathic ether oils such as polyoxypropylene polyglyceryl ether, polyoxybutylene polyoxyethylene polyoxypropylene glyceryl ether, and polyoxyethylene polyoxypropylene dimethyl ether, as well as amphipathic ester oils such as bisethoxydiglycol cyclohexane-1,4-dicarboxylate, polyglyceryl-10 (eicosane diacid/tetradecanedioic acid), bisethoxydiglycol succinate, and diethoxyethyl succinate.

The content of the amphipathic oil relative to the total amount of the composition constituting the oil layer is preferably 10 to 80 mass %, more preferably 20 to 70 mass %, and particularly preferably 30 to 60 mass %.
The content of the amphiphilic oil in the two-layer cosmetic is preferably 0.1 to 30% by mass, more preferably 0.5 to 25% by mass, even more preferably 1 to 20% by mass, and particularly preferably 3 to 10% by mass.

The oil agent used in the present invention preferably contains a silicone oil. Specifically, methyl polysiloxane, methyl phenyl polysiloxane, methyl phenyl polysiloxane, methyl hydrogen polysiloxane, cyclopentasiloxane, methyl trimethicone, bisphenyl propyl dimethicone, etc. can be used. Of these, it is preferable to use a silicone oil having a phenyl group, and it is more preferable to use diphenyl siloxy phenyl trimethicone.

The content of the silicone oil in the total amount of the composition constituting the oil layer is preferably 0.1 to 50% by mass, more preferably 1 to 30% by mass, and even more preferably 3 to 20% by mass.
The content of the silicone oil in the two-layer cosmetic is preferably 0.1 to 10% by mass, more preferably 0.3 to 5% by mass, even more preferably 0.5 to 3% by mass, and particularly preferably 0.8 to 2% by mass.

The composition constituting the oil layer of the present invention is preferably colored in order to obtain a beautiful appearance. Examples of oil-soluble coloring components include Red No. 501, Yellow No. 204, Orange No. 403, Blue No. 403, Green No. 202, Purple No. 201, carotene, copper chlorophyll, guaiazulene, carrot root extract, tomato extract, palm oil, surge oil, safflower oil, yuzu oil, carthamine, Tengu palm fruit oil, coenzyme Q10, chlorophyll, Dunaliella carotene, astaxanthin, canthaxanthin, lycopene, lutein, apocarotenal, fucoxanthin, cryptoxanthin, zeaxanthin, capsanthin, capsorubin, norbixin, and chlorophyll.
Among these, it is preferable to include oil-soluble beauty ingredients such as carrot root extract, coenzyme Q10, and astaxanthin.

The blending amount of the coloring component in the oil layer used in the present invention is preferably 0.0000001 to 1 mass %, more preferably 0.0000005 to 0.5 mass %, based on the total amount of the two-layer cosmetic.

<3> Aqueous phase component The aqueous phase component of the present invention is not particularly limited as long as it is a component that is usually used in cosmetics. For example, lower alcohols such as ethanol and propyl alcohol, polyhydric alcohols such as glycerin and ethylene glycols, and water-soluble polymers such as xanthan gum, calanagin, hydroxyethyl cellulose, and methyl cellulose can be appropriately blended according to the purpose.

Of the above components, the aqueous layer component of the present invention preferably contains a polyhydric alcohol such as glycerin, 1,3-butylene glycol, diglycerin, and dipropylene glycol.
The content of the polyhydric alcohol in the two-layer cosmetic is preferably 5 to 30% by mass, and more preferably 7 to 20% by mass.
By including a polyhydric alcohol, it is possible to stabilize the separation of the oil layer and the aqueous layer.

In the present invention, one or more moisturizing ingredients may be blended as the aqueous layer components other than those described above. Examples of the moisturizing ingredients include sugars such as xylitol, maltitol, maltose, sorbitol, and fructose, amino acids such as glycine, alanine, serine, and proline, and amino acid derivatives such as pyrrolidone carboxylic acid and salts thereof.
The content of the moisturizing ingredient in the two-layer cosmetic is preferably 0.01 to 40% by mass, more preferably 0.1 to 30% by mass, and even more preferably 1 to 20% by mass.

From the viewpoint of usability, the water content in the two-layer cosmetic is preferably 50 to 90% by mass, more preferably 60 to 80% by mass, and even more preferably 65 to 75% by mass.

The composition constituting the aqueous layer of the present invention is preferably colored in order to obtain a beautiful appearance. Examples of water-soluble coloring components include Red No. 106, Red No. 504, Yellow No. 4, Yellow No. 203, Orange No. 205, Blue No. 1, Green No. 401, Purple No. 401, Black No. 401, Phellodendron Bark, Scutellaria Baicalensis Root Extract, Gardenia Extract, Cochineal, Cyanocobalamin, Safflower Extract, Caramel, Logwood Extract, Licorice Extract, Lithospermum Root Extract, Copper Chlorophyllin Sodium, and Guaiazulene Sulfonate.
Among these, it is preferable to include water-soluble beauty ingredients such as Scutellaria root extract, Gardenia extract, Lithospermum root extract, and Safflower extract.
The blending amount of the coloring component in the aqueous layer used in the present invention is preferably 0.0000001 to 1 mass %, more preferably 0.0000005 to 0.5 mass %, based on the total amount of the two-layer cosmetic.

The aqueous layer component of the present invention may contain cosmetic ingredients other than the cosmetic ingredients having coloring ability as described above. Examples include anti-aging ingredients such as stem cell extract, human oligopeptide, and panthenol, whitening ingredients such as vitamin C, tranexamic acid, nicotinamide, and arbutin, and various vitamins.
The content of cosmetic ingredients other than cosmetic ingredients having coloring ability relative to the total amount of the two-layer cosmetic composition is preferably 0.001 to 10 mass %, more preferably 0.01 to 5 mass %, and even more preferably 0.1 to 3 mass %.

Test Example 1: Preparation of a two-layer cosmetic having a spherical oil layer A two-layer cosmetic of the present invention was prepared according to the formulation shown in Table 1 below. That is, composition A constituting the aqueous layer by mixing the aqueous layer components, and composition B constituting the oil layer by mixing the oil layer components were each prepared at room temperature to produce homogeneous compositions A and B. Next, compositions A and B were mixed and filled into 25 ml screw vials to produce containerized cosmetics (Examples 1 to 3, and Comparative Examples 1 and 2). The values in Table 1 indicate the content (mass %) of each component relative to the entire two-layer cosmetic. Figure 1 shows a photograph of Example 1 when left to stand, and Figure 2 shows a photograph immediately after shaking.

<Test Example 2> Appearance evaluation of two-layered cosmetic preparations The two-layered cosmetic preparations of Examples 1 to 3 and Comparative Examples 1 and 2 shown in Table 1 were evaluated for the appearance of the solution and the shape of the oil layer. The appearance of the solution was observed immediately after mixing of the two-layered cosmetic preparations, after leaving it for 60 minutes after mixing, and after leaving it for 3 days after mixing, and the shape of the oil layer was observed after leaving it for 60 minutes after mixing and after leaving it for 3 days after mixing. The results are shown in Table 2.

In Examples 1 to 3, the solutions were homogeneous and slightly cloudy immediately after mixing, but the cloudiness faded and the solution became more transparent when left to stand. On the other hand, in Comparative Examples 1 and 2, the cloudiness remained even when left to stand after mixing, and in Comparative Example 2, the emulsified state was maintained.
Furthermore, the oil layer became spherical and sank to the bottom of the water layer in Examples 1 to 3. On the other hand, in Comparative Examples 1 and 2, the oil layer did not become spherical, but instead became laminar and rose to the top of the water layer.
The containerized cosmetics of Examples 1 to 3 have a novel appearance not seen before and are excellent in appearance.

Test Example 3: Restoration of spherical oil layer The container-packed cosmetic product of Example 1 was shaken to homogenize the water layer and the oil layer. The container-packed cosmetic product was then left to stand for a predetermined period of time, and its appearance was confirmed. The results are shown in FIG.

As shown in FIG. 3, when the container-packed cosmetic material of Example 1 was shaken and then allowed to stand for 10 minutes, the oil layer turned into a number of small globules.
Furthermore, when the mixture was left to stand for 30 minutes after shaking, several small spherical oil layers were combined, and when the mixture was left to stand for another hour after shaking, multiple larger oil layers were formed.

From these results, it can be seen that even if the containerized cosmetic preparation of the present invention has been shaken once to homogenize the oil layer and the water layer, the oil layer will become spherical again when left to stand.
Therefore, the appearance of the containerized cosmetic of the present invention can be enjoyed both before and after use.

The present invention can be applied to liquid/liquid two-layer cosmetics, foods and beverages, medicines, quasi-drugs, etc.

Claims (7)

A two-layer cosmetic separated into an oil layer and an aqueous layer, wherein the oil layer exists as one or more spherical layers,
The oil layer is a sedimentary layer,
a mass ratio of the composition constituting the oil layer to the composition constituting the aqueous layer is 1:99 to 30:70;
The composition constituting the oil layer contains an amphiphilic ester oil agent ,
The amphiphilic ester oil is one or more selected from bisethoxydiglycol cyclohexane-1,4-dicarboxylate, polyglyceryl-10 (eicosane diacid/tetradecanedioate), bisethoxydiglycol succinate, and diethoxyethyl succinate;
The content of the amphiphilic ester oil is 0.5 to 25% by mass based on the total amount of the two-layer cosmetic composition,
A two-layer cosmetic preparation, wherein the specific gravity of the composition constituting the oil layer at a product temperature of 25°C is greater than the specific gravity of the composition constituting the aqueous layer at a product temperature of 25°C, and the specific gravity difference between the composition constituting the oil layer and the composition constituting the aqueous layer at a product temperature of 25°C is 0.001 or more . The two-layer cosmetic according to claim 1 , wherein the amphiphilic ester oil comprises diethoxyethyl succinate. The composition constituting the oil layer contains a silicone oil,
3. The two-layer cosmetic according to claim 1 , wherein the content of said silicone oil is 0.1 to 10% by mass based on the total amount of said two-layer cosmetic . the composition constituting the aqueous layer contains a polyhydric alcohol,
The two-layer cosmetic according to any one of claims 1 to 3, wherein the content of the polyhydric alcohol is 5 to 30% by mass based on the total amount of the two-layer cosmetic. The two-layer cosmetic preparation according to any one of claims 1 to 4 , wherein the oil layer and/or the aqueous layer is transparent or translucent. The two-layer cosmetic material according to any one of claims 1 to 5 , wherein the oil layer and the aqueous layer are different in color. A container-packed cosmetic comprising the two-layer cosmetic composition according to any one of claims 1 to 6 packed in a transparent or translucent container,
When the container-packed cosmetic is left to stand, the aqueous layer and the oil layer are separated,
When the container-packed cosmetic is shaken, the aqueous layer and the oil layer are mixed together,
When the two-layer cosmetic is allowed to stand after the shaking, the oil layer and the aqueous layer become separated, and the oil layer becomes a spherical layer.