WO2021221149A1

WO2021221149A1 - Oil-in-water emulsion composition

Info

Publication number: WO2021221149A1
Application number: PCT/JP2021/017143
Authority: WO
Inventors: 麻依遠山; 頌子小河
Original assignee: 株式会社資生堂
Priority date: 2020-05-01
Filing date: 2021-04-30
Publication date: 2021-11-04
Also published as: CN115379822A; CN115379822B; JPWO2021221149A1

Abstract

[Problem] To provide an oil-in-water emulsion composition that stably maintains vitamin A and the like and powder components while utilizing the moisturizing feeling inherent to oil-in-water emulsion compositions, and that has both the effect of instantaneously correcting the appearance of the skin and the effect of improving wrinkles from a long-term perspective. [Solution] An oil-in-water emulsion composition in which an oil phase is dispersed in an aqueous phase, and which is characterized in that the oil phase includes a first oil phase containing a powder, and a second oil phase containing a polar oil and vitamin A and/or a derivative thereof.

Description

Oil-in-water emulsified composition

The present invention relates to an oil-in-water emulsified composition. More specifically, the present invention relates to an oil-in-water emulsified composition having both an immediate visual skin correction effect and a long-term wrinkle improving effect by simultaneously blending an effective amount of powder and vitamins A (retinols).

Vitamin A (retinol) and its derivatives (referred to as "vitamin A" or "retinol") are known as cosmetic ingredients having an effect of improving skin wrinkles, and various cosmetics containing vitamin A are manufactured. It is known that vitamin A acts on keratinocytes to exert a hyaluronic acid synthesis promoting effect and exerts a wrinkle improving effect by increasing the water content of the stratum corneum. However, vitamin As (retinols) are extremely unstable and have a problem that they are easily altered by the influence of heat, light, oxygen and the like.

Patent Document 1 describes an oil-in-water emulsified skin cosmetic containing vitamin A in combination with three types of nonionic surfactants and a higher alcohol having 14 to 24 carbon atoms. In the skin cosmetics of Patent Document 1, the nonionic surfactant and higher alcohol form an α-gel structure together with oil in the presence of water, stabilizing not only emulsion stability but also vitamin As. It is said that it can be held in. However, in order to obtain the stabilizing effect, it is necessary to use all three types of specific nonionic surfactants, which narrows the range of formulations.

On the other hand, cosmetics having an effect of making unevenness of the skin such as wrinkles less noticeable (“skin correction effect” or “unevenness correction effect”) by the light diffusion effect of the powder component are also known, but in particular, oil-in-water emulsification When powder is added to cosmetics, deterioration of emulsion stability and aggregation of powder may be a problem.

Patent Document 2 states that (A) one or more higher alcohols having a linear saturated alkyl chain; (B) a hydrophilic surfactant containing a nonionic surfactant; (C) an average particle size. By containing 4 to 30% by mass of a powder of 1 to 30 μm; and (D) water, an aqueous cosmetic composition capable of naturally correcting the appearance of the skin while being an aqueous base having a fresh feeling of use. The thing is disclosed.

Patent Document 3 describes (A) 1 to 20% by mass of hydrophobized titanium oxide having an average particle size of 0.1 μm or more; (B) a sugar ester having a carboxyl group in its structure; (C) a liquid higher fatty acid; The oil-in-water emulsified cosmetic containing (D) higher alcohol; (E) nonionic surfactant; (F) water and (G) oil has the effect of making the skin look beautiful and has emulsion stability. It is stated that it is excellent.

In Patent Documents 1 to 3, by introducing an α-gel structure into the system, it has succeeded in stably maintaining vitamin A in Patent Document 1 and powder components in Patent Documents 2 and 3. However, it has been difficult to exert the respective effects while keeping both the vitamin A and the powder stable by simply combining Patent Document 1 with Patent Document 2 or 3.

Japanese Unexamined Patent Publication No. 2010-18536 Re-table 2017/150519 Japanese Unexamined Patent Publication No. 2015-182994

Therefore, the subject of the present invention is the effect of stably retaining vitamin A and powder components while utilizing the fresh feeling of use of the oil-in-water emulsified composition, the effect of immediately correcting the appearance of the skin, and wrinkles from a long-term perspective. It is an object of the present invention to provide an oil-in-water emulsified composition having an improving effect.

As a result of diligent studies to solve the above problems, the present inventors have obtained an oil-in-water emulsified composition containing a first oil phase containing powder and a second oil phase containing vitamin A. By doing so, it has been found that an oil-in-water emulsified composition having both an immediate effect of visually correcting the skin and an effect of improving wrinkles from a long-term perspective and also having excellent stability can be obtained. Has been completed.

That is, the present invention is an oil-in-water emulsified composition in which an oil phase is dispersed in an aqueous phase, wherein the oil phase includes a first oil phase containing powder, vitamin A and / or a derivative thereof, and a polar oil. Provided is an oil-in-water emulsified composition comprising a second oil phase containing.

The oil-in-water emulsified composition according to the present invention contains a powder component having a skin-correcting effect (unevenness-correcting effect) and vitamin A having a wrinkle-improving effect in separate oil phases, thereby mutually. The action can be suppressed. As a result, it is possible to achieve both an immediate skin correction effect and a long-term wrinkle improvement effect. Moreover, the oil-in-water emulsified cosmetic of the present invention is excellent in emulsification stability and can stably retain vitamin A having an effect of improving wrinkles for a long period of time and continuously exert its effect.

The oil-in-water emulsified composition of the present invention (hereinafter, also referred to as "composition of the present invention") includes an aqueous phase which is a continuous phase and a first oil phase and a second oil phase which are dispersed phases. It will be described in detail below.

<First oil phase>
The first oil phase in the composition of the present invention contains a powder and an oil component (also referred to as "first oil component"), and the powder is dispersed in the first oil component.

The powder to be blended in the first oil phase is a powder that can be blended in cosmetics, external preparations for skin, etc., and is not particularly limited as long as it exhibits a skin correction effect (unevenness correction effect), and may be an inorganic powder. It may be an organic powder.

Examples of the inorganic powder include titanium oxide, zinc oxide, talc, mica, sericite, kaolin, black iron oxide, yellow iron oxide, red iron oxide, carbon black, manganese violet, ultramarine blue, dark blue, chromium oxide, and the like. Examples thereof include chromium hydroxide, calcium silicate, magnesium silicate, zinc oxide, calcium carbonate, magnesium carbonate, magnesium silicate, barium sulfate, and pearl pigments (bengala-coated mica, titanium oxide-coated mica, etc.). When the composition of the present invention is used as a sunscreen cosmetic, it is preferable to use an ultraviolet scattering agent such as fine particle titanium oxide or fine particle zinc oxide having an average primary particle diameter of less than 100 μm.

The surface of the inorganic powder particles is preferably hydrophobized. As the surface treatment, silicones such as methylhydrogenpolysiloxane and dimethylpolysiloxane, dextrin fatty acid ester, higher fatty acid, higher alcohol, fatty acid ester, metal soap, alkylphosphate ether, fluorine compound, or carbonization of squalane, paraffin and the like. Examples of methods for hydrophobizing treatment with hydrogens and the like by a wet method using a solvent, a vapor phase method, a mechanochemical method, or the like can be exemplified.

The shape and size of the powder to be blended in the first oil phase are not particularly limited, but it is preferable to include the hydrophobic spherical powder in the blended powder because the skin correction effect is further improved. Examples of the hydrophobic spherical powder include silicone powder, resin powder such as PMMA, silica powder and the like.

The amount of the powder to be blended in the first oil phase may be an amount that exerts a skin correction effect, and is usually 1% by mass or more, typically 3% by mass or more, based on the total amount of the composition. NS. The upper limit of the blending amount of the powder is not particularly limited, but can be, for example, 20% by mass or less, 15% by mass or less, or the like with respect to the total amount of the composition.

As the oil contained in the first oil phase (also referred to as "first oil"), it is preferable to use a non-polar oil selected from hydrocarbon oil and silicone oil. Examples of the silicone oil include chain polysiloxane (for example, dimethylpolysiloxane, methylphenylpolysiloxane, diphenylpolysiloxane, etc.); cyclic polysiloxane (for example, octamethylcyclotetrasiloxane, decamethylcyclopentasiloxane, dodecamethylcyclohexane). Siloxane, etc.).

The amount of oil (first oil) to be blended in the first oil phase is usually 1 to 30% by mass, preferably 2 to 25% by mass, based on the total amount of the composition. In particular, it is preferable that the silicone oil occupies at least 40% by mass or more of the oil component (first oil component) constituting the first oil phase. The composition of the present invention includes, for example, an embodiment containing 50% by mass or more, 65% by mass or more, or 80% by mass or more of silicone oil of the first oil content. Alternatively, the entire first oil component may be used as silicone oil.

In the first oil phase, it is preferable to disperse the powder in the oil using a dispersant. Dispersants (also referred to as "powder dispersants") include higher fatty acids such as lauric acid, myristic acid, palmitic acid, stearic acid, behenic acid, oleic acid, undecylenic acid, tall acid, isostearic acid, linoleic acid, linolein. Acids, eicosapentaenoic acid (EPA), docosahexaenoic acid (DHA) and the like can be mentioned.

The first oil phase is preferably emulsified in the aqueous phase using a surfactant. As a surfactant for emulsifying the first oil phase (referred to as "first surfactant"), it has a silicone-based surfactant, particularly a silicone skeleton (polysiloxane structure), and has an HLB of less than 8. It is preferable to use the above-mentioned surfactant. Silicone-based surfactants include, for example, polyoxyalkylene-modified silicones, polyoxyalkylene-alkyl co-modified silicones, polyglycerin-modified silicones, and / or polyglycerin-alkyl co-modified silicones.

Specific examples of the silicone-based surfactant used as the first surfactant include bisbutyldimethicone polyglyceryl-3, lauryl PEG-9 polydimethylsiloxyethyl dimethicone, PEG-9 polydimethylsiloxyethyl dimethicone, and PEG-. 10 Dimethicone, Bisbutyl Dimethicone Polyglyceryl-3, Cetyl PEG / PPG-10 / 1 Dimethicone, PEG-12 Dimethicone, (Dimethicone / (PEG-10 / 15)) Crosspolymer, (Dimethicone / Polyglycerin-3) Crosspolymer, Examples thereof include (PEG-15 / laurylpolydimethylsiloxyethyl dimethicone) crosspolymer, (acrylic acid / stearyl methacrylate / dimethicone methacrylate) copolymer, amodimethicone and the like.

From the viewpoint of emulsion stability, the first surfactant is preferably blended in an amount of 0.2 to 4% by mass based on the total amount of the composition.

<Second oil phase>
The second oil phase contains vitamin A and / or its derivatives and oils.
Examples of vitamin A and / or its derivatives include vitamin A (= retinol), vitamin A aldehyde (= retinal), vitamin A acid (= retinoic acid), vitamin A fatty acid ester, and salts thereof. Examples of the vitamin A fatty acid ester include retinol acetate, retinol palmitate, retinol propionate, and retinol linoleate. Examples of the salt include alkali metal salts (eg, sodium salt, potassium salt, lithium salt, etc.), alkaline earth metal salts (eg, calcium salt, magnesium salt, etc.), ammonium salts, organic amine salts (eg, monoethanolamine salt, etc.). , Diethanolamine salt, triethanolamine salt, etc.) and the like are exemplified. In the present invention, vitamin A (retinol) is particularly preferably used from the viewpoint of stability, effectiveness and the like. As the vitamin A and / or its derivative, one kind or two or more kinds can be used.

The blending amount of vitamin A and / or its derivative in the composition of the present invention is at least 0.01% by mass, preferably 0.05% by mass, based on the total amount of the composition. If the blending amount is less than 0.01% by mass, it is difficult to sufficiently exert the wrinkle improving effect. On the other hand, since a relatively large amount of vitamin A and / or a derivative thereof can be stably blended in the composition of the present invention, the upper limit of the blending amount is not particularly limited. For example, an upper limit value such as 10% by mass or less, 5% by mass or less, or 4% by mass or less can be set. That is, in the composition of the present invention, for example, a blending amount range of vitamin A and / or a derivative thereof such as 0.01 to 4% by mass or 0.05 to 5% by mass can be selected without limitation.

The oil component to be blended in the second oil phase (also referred to as "second oil component") may contain polar oil as an essential component and may contain other oil components that can be blended in cosmetics and external preparations for skin. .. The polar oil is preferably selected from ester oils and UV absorbers. Examples of other oils include natural fats and oils, waxes and the like.

Specific examples of the ester oil include isopropyl myristate, cetyl octanoate, octyldodecyl myristate, isopropyl palmitate, butyl stearate, hexyl laurate, myristyl myristate, decyl oleate, hexyl decyl dimethyl octanate, and cetyl lactate. Myristyl Lactate, Lanolin Acetate, Isocetyl Stearate, Isocetyl Isostearate, Cholesteryl 12-Hydroxystearate, Ethylene Glycol Di-2-ethylhexanoate, Dipentaerythritol Fatty Acid Ester, N-alkyl Glycol Monoisostearate, Neopentyl Glycol Dicaprate , Diisostearyl malate, Glycerin di-2-heptylundecanoate, Trimethylolpropane tri-2-ethylhexanoate, Trimethylolpropane triisostearate, Pentaerislit tetra-2-ethylhexanoate, Tri-2-ethyl Glycerin hexanoate, glycerin trioctanoate, glycerin triisopalmitate, cetyl 2-ethylhexanoate, 2-ethylhexyl palmitate, glycerin trimyristate, glyceride tri-2-heptylundecanoate, methyl ester of castor oil fatty acid, oleic acid Oleyl, acetoglyceride, 2-heptyl undecyl palmitate, diisobutyl adipate, N-lauroyl-L-glutamic acid-2-octyldodecyl ester, di-2-heptyl undecyl adipylate, ethyllaurate, di2-sebacate Examples thereof include ethylhexyl, 2-hexyldecyl myristate, 2-hexyldecyl palmitate, 2-hexyldecyl adipate, diisopropyl sebacate, 2-ethylhexyl succinate, and triethyl citrate.

As the polar oil contained in the second oil component, an oil-soluble ultraviolet absorber can be blended in place of the above ester oil or in addition to the ester oil. As the oil-soluble UV absorber, those that can be usually used for cosmetics and external skin preparations can be used. For example, triazine-based UV absorbers, benzoic acid-based UV absorbers, anthranilic acid-based UV absorbers, and salicylic acid. Examples thereof include UV absorbers, silicic acid UV absorbers, and benzophenone UV absorbers. Of these, 2-ethylhexyl paramethoxycinnamate, which is an ultraviolet absorber that is liquid at room temperature, is preferably used.

The blending amount of the oil component (second oil component) in the second oil phase is 5 to 40% by mass with respect to the total amount of the composition. The second oil preferably contains polar oil. The blending amount of the polar oil is preferably 1 to 35% by mass, more preferably 10 to 30% by mass, based on the total amount of the composition. The ratio (mass%) of the polar oil to the total amount of the second oil phase is preferably 15% by mass or more, more preferably 30% by mass or more, and further preferably 45% by mass or more.
Further, the polar oil preferably contains an ester oil, and the ratio (mass%) of the ester oil to the total amount of the polar oil is preferably 50% by mass or more, more preferably 60% by mass or more. be.

The second oil phase preferably contains a higher alcohol and / or a higher fatty acid (hereinafter also referred to as "higher alcohol or the like") and a surfactant (referred to as "second surfactant").

Examples of the higher alcohol to be blended in the second oil phase include dodecanol (lauryl alcohol), tridodecanol, tetradodecanol (myristyl alcohol), pentadecanol, hexadecanol (cetyl alcohol), heptadecanol, and the like. Octadecanol (stearyl alcohol), nonadecanol, icosanol (araquil alcohol), henicosanol, docosanol (behenyl alcohol), tricosanol, tetracosanol (carnavir alcohol), pentacosanol, hexacosanol (ceryl alcohol), bacil alcohol, Elysyl alcohol and the like can be mentioned.

As the higher alcohol, etc., one or more of the above can be used. In the present invention, it is preferable to use a mixture of two or more kinds of aliphatic alcohols, and more preferably, the combination is such that the melting point of the mixture is 60 ° C. or higher. If this melting point is less than 60 ° C., the temperature stability of the system may decrease depending on the formulation. In the present invention, for example, a combination of stearyl alcohol, behenyl alcohol and batyl alcohol is particularly preferable.

The blending amount of the higher alcohol or the like in the cosmetic composition of the present invention is not particularly limited, but is 0.3 to 10% by mass, preferably 0.5 to 9% by mass.

As the second surfactant to be blended in the second oil phase, a nonionic surfactant is preferable. For example, it is preferable to use an ether of linear saturated alkyl (preferably 12 to 22 carbon atoms) and polyalkylene glycol (polyethylene oxide, polypropylene oxide, polybutylene oxide, etc.). Specific examples include glycerin monostearyl ether, POE (20) cetyl ether, POE (30) cetyl ether, POE (20) stearyl ether, POE (25) stearyl ether, POE (30) stearyl ether, POE (20) behenyl. Ether, POE (30) behenyl ether, POE (60) glycerin monoisostearate, POE (20) sorbitan monostearate, sorbitan coconut oil fatty acid, PEG-7 glyceryl coconut oil fatty acid, lauramide MEA, laurylpyridinium chloride, PEG laurate -32, PEG-40 cured castor oil laurate, PEG-14 oleate, polyglyceryl-6 oleate, PEG-32 dilaurate, PEG-11 cocamide and the like can be mentioned, but are not limited thereto. In particular, POE (20) cetyl ether, POE (30) cetyl ether, POE (20) stearyl ether, POE (30) stearyl ether, POE (30) behenyl ether and the like can be mentioned. "POE" is an abbreviation for polyoxyethylene.

The blending amount of the second surfactant is preferably 0.3 to 10% by mass, more preferably 0.5 to 5% by mass, based on the total amount of the composition.

By blending a higher alcohol or the like and a second surfactant in the second oil phase, the higher alcohol or the like forms an aggregate composed of a lamellar bilayer film together with the second surfactant in the presence of water. However, it can take a so-called α-gel structure and contributes to the stabilization of the system.

The composition of the present invention is described in Patent Document 1 because it is stabilized by blending powder in the first oil phase and blending a polar oil such as an ultraviolet absorber in the second oil phase. It is not necessary to use a combination of three specific surfactants as described above. Therefore, the composition of the present invention does not contain any one or more of sorbitan tristearate, polyethylene glycol stearate having an addition molar number of 20 to 120, and glyceryl stearate having an HLB of 5 to 8. Includes aspects.

<Aquatic phase>
The composition of the present invention is an oil-in-water emulsified composition in which the above-mentioned first oil phase and second oil phase are dispersed in an aqueous phase.
The aqueous phase, which is a continuous phase in the emulsified composition of the present invention, contains water and optionally contains an aqueous component. Aqueous components are components that are soluble or compatible with water.

By blending a surfactant (referred to as "third surfactant") in the aqueous phase, the stability of the emulsification system is further improved.
As the third surfactant, it is preferable to select a nonionic hydrophilic surfactant having a relatively bulky molecular structure. Specifically, for example, polyoxyethylene hydrogenated castor oil (10EO), polyoxyethylene hydrogenated castor oil (20EO), polyoxyethylene hydrogenated castor oil (30EO), polyoxyethylene hydrogenated Poly such as castor oil (40EO), polyoxyethylene hydrogenated castor oil (50EO), polyoxyethylene hydrogenated castor oil (60EO), polyoxyethylene hydrogenated castor oil (100EO), etc. At least one nonionic selected from the group consisting of oxyethylene hydrogenated castor oil, polyoxyethylene glyceryl stearate, polyoxyethylene glyceryl isostearate, polyoxyethylene glyceryl triisostearate, and polyoxyethylene hydrogenated castor oil succinic acid. A surfactant is preferably used.

The blending amount of the third surfactant in the composition of the present invention is preferably 0.3 to 10% by mass, preferably in the range of 0.5 to 9% by mass, based on the total amount of the composition. More preferred.

Further, it is preferable to add a thickener to the aqueous phase because the emulsification stability can be further improved by suppressing the sedimentation and creaming of the emulsified oil droplets and the aggregation of the powder over time.

The thickener to be blended in the aqueous phase is not particularly limited as long as it is an aqueous phase thickener that can be used in cosmetics and quasi-drugs. For example, xanthan gum, cellulose (carboxymethyl cellulose (salt), etc.), Arabic gum, carrageenan, pectin, canten, quince seed (malmero) extract, starch, algae colloid (brown algae extract), mucopolysaccharide, white jellyfish polysaccharide, succinoglycan. Plant-based polymers such as dextran and purulan, animal-based polymers such as collagen, casein and gelatin, starch-based polymers such as carboxymethyl starch and methylhydroxypropyl starch, (Na acrylate, acryloyl). Examples thereof include acrylic acid-based polymers such as dimethyl taurine Na) copolymers, (dimethyl acrylamide / acryloyl dimethyl taurine Na) cross polymers, and copolymers containing 2-acrylamide-2-methylpropansulfonic acid.
The amount of the thickener to be blended is preferably 0.1 to 6% by mass with respect to the total amount of the composition.

When the silicone elastomer powder is blended with the composition of the present invention, stickiness can be suppressed and the usability of the composition can be further improved. In particular, it is preferable to blend a spherical powder of a silicone elastomer, particularly a white spherical silicone composite powder in which a spherical silicone rubber powder is coated with a silicone resin. The average particle size of the silicone elastomer spherical powder is preferably 0.1 to 100 μm, more preferably 1 to 50 μm, and the JIS-A hardness is preferably in the range of 10 to 80. Specific examples of the silicone elastomer powder include (vinyldimethicone / methicone silsesquioxane) crosspolymer, (diphenyldimethicone / vinyldiphenyldimethicone / silsesquioxane) crosspolymer, and polysilicone-in the cosmetic ingredient labeling name. One or more selected from 1 cross polymer, polysilicone-22, (dimethicone / vinyldimethicone / methicone) cross polymer and the like are preferably used. The blending amount of the silicone elastomer powder is preferably 1 to 10% by mass, more preferably 2 to 8% by mass.
The silicone elastomer powder may be blended in either the oil phase or the aqueous phase, but is preferably blended in the aqueous phase.

The composition of the present invention can be added with various ingredients widely used in cosmetics and quasi-drugs as long as the effects of the present invention are not impaired. For example, water-soluble active substances or stabilizers such as vitamin B group, vitamin C and its derivatives, potassium 4-methoxysalicylate, tranexamic acid, pantothenic acid and its derivatives, vitamins such as biotin, moisturizers, vitamin E, arginine. , Aspartic acid, citric acid, tartaric acid, buffers such as lactic acid, chelating agents such as EDTA, preservatives, coloring materials and the like.

The method for producing the composition of the present invention is not particularly limited, but for example, an oil-in-water emulsion (referred to as "first emulsion") in which the first oil phase component is dispersed in a part of the aqueous phase is prepared. Then, an oil-in-water emulsion (referred to as "second emulsion") in which the second oil phase component is dispersed in the remaining aqueous phase is separately prepared, and then the first emulsion and the second emulsion are prepared. Can be manufactured by mixing with.
Alternatively, it can also be produced by preparing a first emulsion in which the first oil phase component is dispersed in an aqueous phase, and then adding a second oil phase component to the first emulsion and emulsifying it.

The composition of the present invention not only exerts a skin-correcting effect immediately after application while having a fresh feel peculiar to an oil-in-water emulsion, but also has a long-term wrinkle improving effect due to the blended vitamin As. Demonstrate over.

Therefore, it is particularly suitable for use as a water-based basic cosmetic, a makeup cosmetic such as a foundation or a makeup base, or a skin care cosmetic such as a milky lotion or a beauty essence.
The present invention provides an oil-in-water emulsified cosmetic, particularly a skin cosmetic, comprising the composition of the present invention described above. The form of the oil-in-water emulsified cosmetic of the present invention is not particularly limited, and can be provided in various forms such as cream, milky lotion, or gel.

The present invention will be described in more detail with reference to Examples below, but the present invention is not limited to the Examples. Unless otherwise specified, the blending amount is shown in% by mass.

An oil-in-water emulsified composition was prepared according to the formulations listed in Tables 1 and 2 below.
The composition of each example was produced as follows.
(1) Prepare an aqueous phase.
(2) A first oil phase (oil phase 1) that has been subjected to a dispersion treatment is prepared.
(3) The first oil phase is mixed with the aqueous phase to prepare a first emulsion.
(4) The second oil phase component (oil phase 2) is heated and mixed to prepare a second oil phase.
(5) The second oil phase is mixed with the first emulsion and cooled to room temperature.

The following evaluations were carried out for the compositions of each example shown in Tables 1 and 2 above. The evaluation results are also shown.

<Emulsification stability (stability over time)>
The compositions of each example were stored at 50 ° C. for 1 month, and the appearance was visually observed to evaluate the emulsion stability according to the following criteria.
A: No change (separation) was observed in the appearance after 1 month (50 ° C.).
B: Slight separation was observed after 1 month (50 ° C).
C: After 1 month (50 ° C), a clear separation was observed.

<Skin correction effect>
The composition of each example (immediately after production) was applied to the face by a specialized panel (10 people), and the actual feeling of the effect was evaluated for the skin correction effect after application according to the following criteria.
A: Nine or more people evaluated that they had a "real feeling of effect."
B: 6 to 8 people evaluated that they "have a real feeling of effect."
C: 4 to 5 people evaluated that "there is a real feeling of effect".
D: 3 or less evaluated that "there is a real feeling of effect".

<Wrinkle improvement effect>
The compositions of each example were shielded from light with aluminum foil and stored at 50 ° C. for 1 month. The amount of vitamin A in the composition after 1 month (50 ° C.) was analyzed by high performance liquid chromatography, and the residual ratio (%) with respect to the amount of vitamin A immediately after production was calculated. The higher the residual rate, the more the activity of vitamin A is maintained and the effect of improving wrinkles is exhibited.
The conditions of high performance liquid chromatography used are as follows.
Column: C18 column (manufactured by Shiseido Co., Ltd.)
Detection: UV310nm
Mobile phase: 72% ethanol / 10% acetonitrile / 17.5% ion-exchanged water / 0.5% acetic acid

Evaluation criteria:
A: Residual rate is 90% or more B: Residual rate is 80% or more and less than 90% C: Residual rate is 60% or more and less than 80% D: Residual rate is less than 60%

As shown in Tables 1 and 2, the compositions of the present invention (Examples 1 to 5) in which the powder was blended in the first oil phase and vitamin A was blended in the second oil phase had emulsion stability. Good results were obtained in all of the skin correction effect and the wrinkle improvement effect. These good results show that the amount of vitamin A in the second oil phase is increased (implementation) regardless of the type and amount of the thickener to be blended in the aqueous phase, or the presence or absence of the silicone elastomer powder (Examples 1 to 3). It does not depend on Example 4) or the type of oil in the first oil phase (Example 5). On the other hand, when the ratio of the polar oil in the second oil phase was lowered, the wrinkle improving effect was slightly reduced, but there was no problem in practical use (Example 6). The composition of Example 6 was separated under severe conditions of storage at 50 ° C. for 1 month, but was stable for more than 1 month when stored at the actual operating temperature (room temperature).
As a matter of course, the skin correction effect was not obtained in Comparative Example 1 in which the powder was not blended with respect to these Examples. Further, in Comparative Example 2 in which the powder and vitamin A were blended in the same oil phase, vitamin A could not be stably retained, and a sufficient wrinkle improving effect could not be obtained.

Other formulations of the cosmetic composition of the present invention are listed in Table 3 below.

Claims

An oil-in-water emulsified composition in which an oil phase is dispersed in an aqueous phase, wherein the oil phase contains a first oil phase containing powder and a second oil containing vitamin A and / or a derivative thereof and a polar oil. An oil-in-water emulsified composition comprising a phase.
The oil-in-water emulsified composition according to claim 1, wherein the first oil phase contains a non-polar oil.
The oil-in-water emulsified composition according to claim 2, wherein the non-polar oil contains a silicone oil.
The oil-in-water emulsified composition according to any one of claims 1 to 3, wherein the second oil phase contains 0.01% by mass or more of vitamin A and / or a derivative thereof based on the total amount of the composition. ..
The oil-in-water emulsified composition according to claims 1 to 4, wherein the second oil phase contains 1 to 35% by mass of polar oil with respect to the total amount of the composition.
The oil-in-water emulsified composition according to any one of claims 1 to 5, wherein the second oil phase contains 15% by mass or more of polar oil with respect to the total amount of the second oil phase.
The oil-in-water emulsified composition according to any one of claims 1 to 6, wherein the polar oil contains an ultraviolet absorber.
The oil-in-water emulsified composition according to any one of claims 1 to 7, wherein the second oil phase contains a higher alcohol and / or a higher fatty acid.
At least one aqueous phase selected from the group consisting of polyoxyethylene hydrogenated castor oil, polyoxyethylene glyceryl stearate, polyoxyethylene glyceryl isostearate, polyoxyethylene glyceryl triisostearate, polyoxyethylene hydrogenated castor oil succinic acid. The oil-in-water emulsified composition according to any one of claims 1 to 8, which comprises a nonionic surfactant of the species.
An oil-in-water emulsified cosmetic comprising the oil-in-water emulsified composition according to any one of claims 1 to 9.