JP6752574B2 - Underwater oil type emulsified cosmetic - Google Patents

Description

The present invention relates to an oil-in-water emulsified cosmetic.

An oil-in-water (O / W) type emulsified composition in which the continuous phase is an aqueous phase is widely used as a cream, lotion, etc. because it has a good usability when used as an external composition such as cosmetics. (For example, the following Patent Documents 1 to 3 and the like).

It is known that the stability of oil-in-water emulsified cosmetics is affected by the particle size of the oil droplet particles, the repulsive force between the oil droplet particles, and the viscosity of the continuous phase. For example, when the particle size of the oil droplet particles is large, the oil layer and the aqueous phase are separated over time, so a high-pressure emulsifier such as a homogenizer or a nanomizer is used to improve the stability of the composition. The particle size of the oil droplet particles has been reduced by a method, a D-phase emulsification method, or the like (see, for example, Patent Documents 4 and 5).

Japanese Unexamined Patent Publication No. 2014-114230 Japanese Unexamined Patent Publication No. 2015-059114 Japanese Unexamined Patent Publication No. 2013-006790 Japanese Unexamined Patent Publication No. 2006-089420 Japanese Unexamined Patent Publication No. 2007-289074

The present inventors have continued diligent research to develop an oil-in-water emulsified cosmetic containing a meadowfoam oil that is less sticky and has a moisturizing and emollient feeling. As a result, a water-soluble ester is used as a surfactant. When the sugar fatty acid ester and the glycerin monofatty acid ester were used, there was a problem that the particle size of the oil droplet particles was large, the particle size distribution width was large, and non-uniform oil droplet particles were formed.

The present invention has been made to solve the above-mentioned problems, and is an oil in water containing an emulsion oil having uniform oil droplet particles having a small average particle size of oil droplet particles and a small particle size distribution width. The purpose is to provide emulsified cosmetics.

As a result of intensive studies to solve the above-mentioned problems, the present inventors surprisingly, as surfactants, in addition to water-soluble sucrose fatty acid ester and glycerin monofatty acid ester, N-acylglutamic acid and / or It has been found that when the salt is used, an oil-in-water emulsified cosmetic having a uniform oil droplet particle having a small average particle size of oil droplet particles and a small particle size distribution width can be prepared. Based on such findings, the present inventors have completed the present invention by repeating further research.

That is, the present invention typically includes the subjects described in the following sections.
Item 1.
(A) Ingredient: Meadowfoam oil,
Component (B): N-acylglutamic acid and / or a salt thereof,
An oil-in-water emulsified cosmetic containing a component (C): a water-soluble sucrose fatty acid ester and a component (D): a glycerin monofatty acid ester.
Item 2.
Item 2. The oil-in-water emulsified cosmetic according to Item 1, wherein the component (A) is contained in an amount of 1 to 20% by mass based on the total amount of the composition.
Item 3.
Item 2. The oil-in-water emulsified cosmetic according to Item 1 or 2, wherein the component (B) is contained in an amount of 0.05 to 0.5% by mass based on the total amount of the composition.
Item 4.
The oil-in-water emulsified cosmetic according to any one of Items 1 to 3 above, which further comprises component (E): a higher alcohol.
Item 5.
The oil-in-water emulsified cosmetic according to any one of Items 1 to 4, further comprising (F) component: hydrogenated lecithin.
Item 6.
The oil-in-water emulsified cosmetic according to any one of Items 1 to 5, wherein the average particle size of the oil droplets is 1.0 to 2.0 μm.
Item 7.
The oil-in-water emulsified cosmetic according to any one of Items 1 to 6 above, wherein the standard deviation of the particle size distribution of the oil droplets is 0.20 or less.

The oil-in-water emulsified cosmetic of the present invention has uniform oil droplet particles having a small particle size of oil droplet particles and a small particle size distribution width. Therefore, the oil-in-water emulsified cosmetic of the present invention exhibits high stability over time.

It is a figure which shows the analysis result of the particle size distribution of the oil-in-water emulsified cosmetic of Example 1. It is a figure which shows the analysis result of the particle size distribution of the oil-in-water emulsified cosmetic of Example 2. It is a figure which shows the analysis result of the particle size distribution of the oil-in-water emulsified cosmetic of Example 3. It is a figure which shows the analysis result of the particle size distribution of the oil-in-water emulsified cosmetic of Example 4. It is a figure which shows the analysis result of the particle size distribution of the oil-in-water emulsified cosmetic of Example 5. It is a figure which shows the analysis result of the particle size distribution of the oil-in-water emulsified cosmetic of Example 6. It is a figure which shows the analysis result of the particle size distribution of the oil-in-water emulsified cosmetic of Example 7. It is a figure which shows the analysis result of the particle size distribution of the oil-in-water emulsified cosmetic of Example 8. It is a figure which shows the analysis result of the particle size distribution of the oil-in-water emulsified cosmetic of Example 9. It is a figure which shows the analysis result of the particle size distribution of the oil-in-water emulsified cosmetic of Example 10. It is a figure which shows the analysis result of the particle size distribution of the oil-in-water emulsified cosmetic of Comparative Example 1. It is a figure which shows the analysis result of the particle size distribution of the oil-in-water emulsified cosmetic of Comparative Example 2. It is a figure which shows the analysis result of the particle size distribution of the oil-in-water emulsified cosmetic of Comparative Example 3. It is a figure which shows the analysis result of the particle size distribution of the oil-in-water emulsified cosmetic of Comparative Example 4.

Hereinafter, the present invention will be described in detail.

The oil-in-water emulsified cosmetic of the present invention
(A) Ingredient: Meadowfoam oil,
Component (B): N-acylglutamic acid and / or a salt thereof,
Component (C): water-soluble sucrose fatty acid ester, and component (D): glycerin monofatty acid ester.

Meadowfoam oil, which is the component (A), is a fatty oil obtained from the seeds of Meadowfoam (Limnanthaceae alba).

The content of the component (A) in the oil-in-water emulsified cosmetic of the present invention is not particularly limited as long as the moisturizing feeling and emollient feeling of Meadowfoam are exhibited, and for example, the total amount of the composition is used as a reference. , 1 to 20% by mass, preferably about 2.5 to 17.5% by mass, and more preferably about 5 to 17.5% by mass.

The component (B), N-acylglutamic acid, is a glutamic acid derivative having a structure in which the amino group of glutamic acid is replaced with an acyl group, and N-acylglutamic acid is a salt of the glutamic acid derivative. The acyl group in N-acylglutamic acid is not particularly limited, and is preferably an acyl group derived from a saturated or unsaturated linear or branched fatty acid having 8 to 24 carbon atoms, and has 8 to 24 carbon atoms. It is more preferably an acyl group derived from a saturated linear or branched fatty acid, further preferably an acyl group derived from a saturated linear fatty acid having 8 to 24 carbon atoms, and 12 to 12 carbon atoms. It is particularly preferable that the acyl group is derived from 24 saturated linear or higher fatty acids. Examples of such an acyl group include a capryloyl group, a pelargoyle group, a lauroyl group, a myristoylation group, a palmitoyl group, a stearoyl group, an isostearoyl group, an oleoyl group and the like. Examples of the salt of N-acylglutamic acid include sodium salt of N-acylglutamic acid, alkali metal salt such as disodium salt and potassium salt; metal salt such as aluminum salt; and amine salt such as triethanolamine salt. ..

Specific examples of the component (B) include N-lauroyl-L-glutamic acid, N-lauroyl-L-glutamic acid Na, N-lauroyl-L-glutamic acid 2Na, N-lauroyl-L-glutamic acid K, and N-lauroyl-L. -Glutamic acid TEA, N-myristoyl-L-glutamic acid, N-myristoyl-L-glutamic acid Na, N-myristoyl-L-glutamic acid K, N-stearoyl-L-glutamic acid, N-stearoyl-L-glutamic acid Na, N-stearoyl Examples thereof include -L-glutamic acid 2Na, N-stearoyl-L-glutamic acid K, and N-stearoyl-L-glutamic acid Al. Among these, sodium N-lauroyl-L-glutamic acid and sodium N-stearoyl-L-glutamic acid are preferable from the viewpoint of availability and cost.

The content of the component (B) in the oil-in-water emulsified cosmetic of the present invention is not particularly limited as long as the effect of the present invention is exhibited, and for example, 0.01 to 0.01 to the total amount of the composition as a reference. It is about 0.5% by mass, preferably about 0.05 to 0.4% by mass, and more preferably about 0.1 to 0.3% by mass.

As the component (B) in the oil-in-water emulsified cosmetic of the present invention, one of the substances included in the above-mentioned component (B) may be used alone, or two or more thereof may be used in combination. Good. When two or more kinds are used in combination, the mixing ratio of each substance is not particularly limited and can be appropriately set.

The water-soluble sucrose fatty acid ester as the component (C) is an ester having a structure in which a fatty acid is ester-bonded to the hydroxyl group of sucrose. In addition, sucrose fatty acid esters exist from monoesters to octaesters, depending on the number of fatty acid residues ester-bonded to the eight hydroxyl groups present in sucrose. The water-soluble sucrose fatty acid ester as the component (C) is not particularly limited as long as it is water-soluble, and examples thereof include sucrose monofatty acid ester, sucrose difatty acid ester, and sucrose trifatty acid ester. Be done. Of these, sucrose monofatty acid esters are preferred. The water-soluble sucrose fatty acid ester which is the component (C) includes sucrose monofatty acid ester, sucrose difatty acid ester, sucrose trifatty acid ester, sucrose tetra fatty acid ester, sucrose penta fatty acid ester, and sucrose hexafatty acid. It may be a mixture containing at least one selected from the group consisting of fatty acid ester, sucrose hepta fatty acid ester and sucrose octa fatty acid ester. The content of the sucrose monofatty acid ester in the mixture is not particularly limited as long as it exhibits water solubility, and is, for example, 40% by mass or more, preferably 50% by mass or more, and more preferably 60% by mass. As mentioned above, it is particularly preferably 70% by mass or more.

The fatty acid in the water-soluble sucrose fatty acid ester is not particularly limited, and is preferably a saturated or unsaturated linear or branched fatty acid having 8 to 24 carbon atoms, and is saturated with 8 to 24 carbon atoms. It is more preferably a linear or branched fatty acid, further preferably a saturated linear fatty acid having 8 to 24 carbon atoms, and a saturated linear fatty acid having 12 to 24 carbon atoms. It is particularly preferable to have. Examples of such fatty acids include caprylic acid, pelargonic acid, lauric acid, myristic acid, palmitic acid, stearic acid, erucic acid, behenic acid, isostearic acid, oleic acid and the like.

Specific examples of sucrose fatty acid esters include sucrose monolaurate, sucrose dilaurate, sucrose polylaurate, sucrose monostearate, sucrose distearate, sucrose tristearate, sucrose polystearate, sucrose monopalmitate, sucrose dipalmitate. , Sucrose tripalmitate, sucrose hexapalmitate, sucrose pentaerucate, sucrose hexaerucate, sucrose tribechenate and the like. Among these, sucrose monostearate and sucrose monopalmitate are preferable. As a specific example of the water-soluble sucrose fatty acid ester as the component (C), sucrose monostearate or sucrose monopalmitate is 40% by mass or more, preferably 50% by mass or more, more preferably 60% by mass or more, particularly preferably. Is a mixture containing 70% by mass or more.

The content of the component (C) in the oil-in-water emulsified cosmetic of the present invention is not particularly limited as long as the effect of the present invention is exhibited, and is, for example, 0.1 to 1 based on the total amount of the composition. It is about 1.0% by mass, preferably about 0.2 to 0.9% by mass, and more preferably about 0.3 to 0.8% by mass.

As the component (C) in the oil-in-water emulsified cosmetic of the present invention, one of the substances included in the above-mentioned component (C) may be used alone, or two or more thereof may be used in combination. Good. When two or more kinds are used in combination, the mixing ratio of each substance is not particularly limited and can be appropriately set.

The glycerin monofatty acid ester as the component (D) is a monoester of glycerin and a fatty acid. The fatty acid in the glycerin monofatty acid ester is not particularly limited, and is preferably a saturated or unsaturated linear or branched fatty acid having 8 to 24 carbon atoms, and a saturated or unsaturated fatty acid having 12 to 24 carbon atoms. More preferably, it is a linear or branched fatty acid. Examples of such fatty acids include caprylic acid, pelargonic acid, lauric acid, myristic acid, palmitic acid, stearic acid, isostearic acid, linoleic acid, arachidonic acid, oleic acid and the like.

Specific examples of the component (D) include sucrose monolaurate (glyceryl laurate), glycerin monocaprylate (glyceryl caprylate), glycerin monocaprate (glyceryl caprate), glycerin monomyristate (glyceryl myristate), and mono. Glycerin palmitate (glyceryl palmitate), glycerin monostearate (glyceryl stearate), glycerin monoisostearate (glyceryl isostearate), glycerin monolinolate (glyceryl linoleate), glycerin monoarachidate (glyceryl arachidate), mono Examples thereof include glycerin oleate (glyceryl oleate). Among these, glyceryl stearate and glyceryl oleate are preferable.

The content of the component (D) in the oil-in-water emulsified cosmetic of the present invention is not particularly limited as long as the effect of the present invention is exhibited, and is, for example, 0.1 to 1 based on the total amount of the composition. It is about 3.0% by mass, preferably about 0.5 to 2.5% by mass, and more preferably about 0.5 to 2.0% by mass.

Further, as the component (D) in the oil-in-water emulsified cosmetic of the present invention, one of the substances included in the above-mentioned component (D) may be used alone, or two or more thereof may be used in combination. You may. When two or more kinds are used in combination, the mixing ratio of each substance is not particularly limited and can be appropriately set.

Further, the oil-in-water emulsified cosmetic of the present invention preferably contains the component (E): higher alcohol. In the present specification, the higher alcohol means an alcohol having 16 to 24 carbon atoms in the molecule. Among the higher alcohols, alcohols having 18 to 24 carbon atoms in the molecule are preferable.

Specific examples of the component (E) include cetyl alcohol, isocetyl alcohol, stearyl alcohol, isostearyl alcohol, behenyl alcohol and the like. Of these, behenyl alcohol is preferred.

The content of the component (E) in the oil-in-water emulsified cosmetic of the present invention is not particularly limited, and is, for example, about 0.1 to 2.0% by mass, preferably 0.1 to 1, based on the total amount of the composition. It is about 1.5% by mass, more preferably about 0.1 to 1.0% by mass.

As the component (E) in the oil-in-water emulsified cosmetic of the present invention, one of the substances included in the above-mentioned component (E) may be used alone, or two or more thereof may be used in combination. Good. When two or more kinds are used in combination, the mixing ratio of each substance is not particularly limited and can be appropriately set.

Further, the oil-in-water emulsified cosmetic of the present invention preferably contains the component (F): hydrogenated lecithin. Hydrogenated lecithin is a lecithin derivative obtained by hydrogenating lecithin, and is also referred to as hydrogenated lecithin. The lecithin is not particularly limited, but has a phosphatidylcholine content of 60% by mass or more, more preferably 70% by mass or more, further preferably 80% by mass or more, and most preferably 90% by mass or more. For example, soybean lecithin, corn lecithin, cottonseed oil lecithin, egg yolk lecithin, egg white lecithin and the like can be mentioned. Available as Lipid), COATSOME NC-21, COATSOME NC-61 (Nichiyu), Basis LS-60HR (Nissin Oillio Group), Mizuzo Lecithin (Ajinomoto Healthy Supply), etc. ..

The content of the component (F) in the oil-in-water emulsified cosmetic of the present invention is not particularly limited, and is, for example, about 0.01 to 0.2% by mass, preferably 0.025 to, based on the total amount of the composition. It is about 0.175% by mass, more preferably about 0.05 to 0.15% by mass.

Further, the oil-in-water emulsified cosmetic of the present invention may contain other components in addition to the above-mentioned components. The other ingredients are not particularly limited, and usually, ingredients that can be blended in cosmetics can be used. For example, oils and fats other than the above components (A), surfactants other than the above components (B) to (D), polymer compounds, alcohols, moisturizers, antioxidants, UV absorbers, preservatives, chelating agents. , Amino acids, sugars, vitamins, animal and plant extracts, colorants, powders such as inorganic powders and organic powders, and components such as pH adjusters such as organic acids and inorganic acids.

Examples of fats and oils other than the component (A) include vegetable oils other than meadowfoam oil; animal oils; hydrocarbon oils such as liquid paraffin, squalane, and vaseline; chain polysiloxane, cyclic polysiloxane, methyltrimethicone, silicone resin, and modified poly. Silicone oils such as siloxane; higher fatty acids such as lauric acid, stearic acid, and oleic acid; waxes such as honey wax, lanolin and derivatives thereof; monoalkyl fatty acid esters; polyhydric alcohol fatty acid esters; hydrogenated oils and the like.

Examples of the surfactant other than the components (B) to (D) and (F) include anionic surfactants such as fatty acid soap, alkyl ether carboxylate, polyoxyethylene alkyl ether phosphate, and N-acyl taurine salt. Agents: Amphoteric surfactants such as imidazoline amphoteric surfactants and betaine surfactants; sorbitan surfactants, polyglycerin fatty acid esters, propylene glycol fatty acid esters, alkyl glycosides, polyoxyethylene sorbitan surfactants, poly Examples thereof include nonionic surfactants such as oxyethylene glycerin fatty acid ester, polyoxyethylene propylene glycol fatty acid ester, polyoxyethylene hydrogenated castor oil derivative, glycerin alkyl ether, polyoxyethylene alkyl ether, pluronic type surfactant, and alkanolamide.

Examples of the polymer compound include polyethylene glycol having an average molecular weight of about tens of thousands; cellulose-based polymer; alginic acid-based polymer; starch-based polymer; acrylic polymer; vinyl-based polymer and other unnatural polymers. , Carrageenan, pectin, canten, starch, arabic gum, guar gum, algae colloid and other plant macromolecules, collagen and its derivatives, casein, gelatin and other animal macromolecules, xanthan gum, gellan gum and other microbial macromolecules, etc. Examples include macromolecules.

Examples of alcohols include monohydric lower alcohols such as ethyl alcohol and butyl alcohol; higher alcohols such as lauryl alcohol, stearyl alcohol, behenyl alcohol and batyl alcohol; ethylene glycol, propylene glycol, 1,3-butylene glycol and glycerin. Polyhydric alcohols; polyhydric alcohol polymers such as dipropylene glycol, diglycerin, polyglycerin; sugar alcohols such as sorbitol, martitol, mannitol, erythritol; other alcohols such as lanolin alcohol, cholesterol, phytosterol, etc. Can be mentioned.

Moisturizers include, for example, low molecular weight polyethylene glycol, propylene glycol, 1,3-butylene glycol, polyhydric alcohols such as glycerin, chondroitin sulfate, hyaluronic acid, sodium lactate, pyrrolidone carboxylate, collagens, plant extracts. And so on.

The average particle size of the oil droplets in the oil-in-water emulsified cosmetic of the present invention is preferably 1.0 to 2.0 μm, more preferably 1.0 to 1.75 μm, and 1.05 to 1. It is more preferably .65 μm. The average particle size of the oil droplets is the median diameter measured by a laser diffraction type particle size distribution measuring device (trade name: SALD-2200, manufactured by Shimadzu Corporation).

Further, the oil droplets in the oil-in-water emulsified cosmetic of the present invention preferably have a small particle size distribution width. Specifically, the standard deviation of the particle size distribution of the oil droplets is preferably 0.20 or less, more preferably 0.19 or less, further preferably 0.18 or less, and 0.17. It is more preferably less than or equal to, and particularly preferably 1.6 or less. The standard deviation of the particle size distribution of oil droplets is a value measured by a laser diffraction type particle size distribution measuring device (trade name: SALD-2200, manufactured by Shimadzu Corporation).

The form of the oil-in-water emulsified cosmetic of the present invention is not particularly limited, and for example, it can be suitably used as a creamy or milky cosmetic.

The method for producing the oil-in-water emulsified cosmetic of the present invention is not particularly limited, and can be produced according to a conventional method. For example, it can be manufactured as follows. An oil phase containing the components (A) and (D) and an aqueous phase containing the components (B) and (C) were prepared, respectively, and heated (preferably about 70 to 90 ° C.) as necessary. After that, the aqueous phase and the oil phase are mixed and emulsified, and the emulsion is cooled (preferably less than 50 ° C.) to produce the product. An emulsifying machine such as a homomixer or a homogenizer can be used for mixing.

Hereinafter, the present invention will be described in more detail with reference to examples, but the present invention is not limited to the following examples.

Production Example: Preparation of oil-in-water emulsified cosmetics An oil phase and an aqueous phase were prepared by mixing each component in the blending amounts shown in Examples 1 to 10 and Comparative Examples 1 to 4 in Table 1 below. Next, the aqueous phase and the oil phase were heated to 80 to 85 ° C., the oil phase was added to the aqueous phase, emulsified using a homomixer, and cooled to about 45 ° C. Then, the neutralizing agent and the preservative were added in the blending amounts shown in Examples 1 to 10 and Comparative Examples 1 to 4 in Table 1 below, and the mixture was uniformly stirred to form Examples 1 to 10 and Comparative Examples. 1 to 4 cosmetics were prepared.

After preparing the cosmetics of Examples 1 to 10 and Comparative Examples 1 to 4, it was visually confirmed that all the cosmetics were emulsified.

Test Example: Analysis of particle size distribution For the oil-in-water emulsified cosmetics of Examples 1 to 10 and Comparative Examples 1 to 4 prepared in the above production examples, a particle size distribution measuring device (trade name: SALD-2200, manufactured by Shimadzu Corporation). Was used to analyze the particle size distribution of oil droplets. The analysis results of the particle size distribution of oil droplets in each oil-in-water emulsified cosmetic are shown in FIGS. 1 to 14. Furthermore, the average particle size (median diameter) of the oil droplets and the standard deviation of the particle size distribution were calculated. The calculation results are shown in the test result column of Table 1 below.

From the above results, in cosmetics containing meadowfoam oil, water-soluble sucrose fatty acid ester, and glycerin monofatty acid ester (Comparative Examples 1 to 4), oil droplets having an average particle size of more than 2 μm were formed, and further, the particle size was further increased. It was confirmed that non-uniform oil droplet particles having a wide distribution width were formed. On the other hand, in cosmetics containing meadowfoam oil, water-soluble sucrose fatty acid ester, glycerin monofatty acid ester, and N-acylglutamic acid (Examples 1 to 10), oil droplets having an average particle size of 2 μm or less are formed. It was confirmed that uniform oil droplet particles having a small particle size distribution were formed.

Claims (6)

(A) Ingredient: Meadowfoam oil,
Component (B): N-acylglutamic acid and / or a salt thereof,
Component (C): water-soluble sucrose fatty acid ester, and component (D): glycerin monofatty acid ester.
Wherein the water-soluble sucrose fatty acid ester is Ri sucrose fatty acid monoesters der,
The average particle diameter of the oil droplets is Ru 1.0~2.0μm der, oil-in-water emulsified cosmetic
(However, oil-in-water emulsified cosmetics containing ester oil consisting of branched-chain fatty acids and branched-chain alcohols are excluded) . The oil-in-water emulsified cosmetic according to claim 1, wherein the component (A) is contained in an amount of 1 to 20% by mass based on the total amount of the composition. The oil-in-water emulsified cosmetic according to claim 1 or 2, wherein the component (B) is contained in an amount of 0.05 to 0.5% by mass based on the total amount of the composition. The oil-in-water emulsified cosmetic according to any one of claims 1 to 3, further comprising component (E): a higher alcohol. The oil-in-water emulsified cosmetic according to any one of claims 1 to 4, further comprising component (F): hydrogenated lecithin. The oil-in-water emulsified cosmetic according to any one of claims 1 to 5 , wherein the standard deviation of the particle size distribution of oil droplets is 0.20 or less.