JP6900415B2 - Water-in-oil emulsified cosmetic - Google Patents

Description

The present invention relates to a water-in-oil emulsified cosmetic containing an ultraviolet scattering agent.

While the importance of sunscreen measures in daily life has been pointed out, cosmetics containing UV absorbers and UV scatterers have been developed for the purpose of effectively blocking UV irradiation on the skin. However, if a large amount of an ultraviolet absorber or an ultraviolet scattering agent is added in an attempt to achieve a high SPF (Sun Protection Factor), various problems may occur.

For example, UV absorbers are highly irritating to the skin and are not preferable for users with sensitive skin. Therefore, it is expected that the UV protection function will be achieved by using a UV scattering agent such as a metal oxide powder while avoiding the blending of a UV absorber as much as possible. However, if a large amount of an ultraviolet scattering agent is added, the stability over time is impaired due to a decrease in viscosity, and there is a problem that the skin after application becomes powdery and dry, resulting in poor usability. ..

In order to improve the above problems, for example, Patent Documents 1 and 2 describe silicone-treated metal oxides, polyether-modified silicones and oily components, and dimethylpolysiloxane and cyclopentasiloxane having a total amount of 30% by mass or more. Water-in-oil emulsified cosmetics containing

JP-A-2018-35091 JP-A-2018-35092

However, since the water-in-oil emulsified cosmetics described in Patent Documents 1 and 2 contain a large amount of silicone resin, there is a problem that a film feeling is strong and a feeling of strangeness remains. In addition, the water-in-oil emulsified cosmetics described in Patent Documents 1 and 2 have a problem in usability, such as not feeling moisture and feeling sticky.

Therefore, the present invention has excellent stability over time while being able to reduce the content of the silicone resin as compared with the water-in-oil emulsified cosmetics described in Patent Documents 1 and 2, and is suitable for the skin after application. It is an object to be solved by the invention to provide a water-in-oil emulsified cosmetic that is moisturized and less sticky.

In an attempt to solve the above problems, the present inventors have studied various combinations of hydrophobicized surface-treated fine particle metal oxides, polyether-modified silicones, and oily components, and found that either stability over time or usability is obtained. Good things were obtained, but neither was excellent.

Therefore, after repeating trial and error and working diligently on research and development, surprisingly, alkyl-unmodified and polyether-modified silicone was used as the polyether-modified silicone, and triester was used as the oil component, and these and poly. By blending with glycerin fatty acid ester, even if it contains a high concentration of hydrophobized surface-treated fine particle metal oxide, it has excellent stability over time, and the skin feels moisturized and sticky after application. It has been found that a small amount of water-in-oil emulsified cosmetics can be obtained.

Based on these findings, the present inventors have solved the problems of the present invention by providing a hydrophobic surface-treated fine particle metal oxide, an alkyl-unmodified and polyether-modified silicone, and a polyglycerin fatty acid ester. And succeeded in creating a water-in-oil emulsified cosmetic containing triester. The present invention is an invention completed based on these findings and successful examples.

Therefore, according to one aspect of the present invention, the following water-in-oil emulsified cosmetics are provided.
[1] (A) Hydrophobicized surface-treated fine particle metal oxide,
(B) Alkyl-unmodified and polyether-modified silicone,
(C) Polyglycerin fatty acid ester and
A water-in-oil emulsified cosmetic containing (D) a triester and having a content of the component (B) of 3.0% by mass or more.
[2] (A) Hydrophobicized surface-treated fine particle metal oxide,
(B) Alkyl-unmodified and polyether-modified silicone,
(C) Polyglycerin fatty acid ester and
A water-in-oil emulsified cosmetic containing (D) a triester and having a content of the component (C) of 0.01% by mass to 1.4% by mass.
[3] (A) Hydrophobicized surface-treated fine particle metal oxide,
(B) Alkyl-unmodified and polyether-modified silicone,
(C) Polyglycerin fatty acid ester and
Water-in-oil emulsified makeup containing (D) triester and having a ratio of the component (B) to the component (C) of 2.0 or more (component (B) / component (C)). Fee.
[4] The item according to any one of [1] to [3], wherein the component (C) is a polyglycerin fatty acid ester selected from the group consisting of polyglycerin fatty acid esters having an HLB value of 3 to 6. Water-in-oil emulsified cosmetics.
[5] Of [1] to [4], the component (B) is an alkyl-unmodified and polyether-modified silicone selected from the group consisting of alkyl-unmodified and polyether-modified silicones having an HLB value of 3 to 6. The water-in-oil emulsified cosmetic according to any one of the items.
[6] The water-in-oil emulsification according to any one of [1] to [5], wherein the component (D) is a triester selected from the group consisting of dipentaerythritol fatty acid ester and triethylhexanoin. Cosmetics.
[7] The water-in-oil emulsified cosmetic according to any one of [1] to [6], wherein the content of the component (D) is 1% by mass to 8.5% by mass.
[8] The water-in-oil emulsified cosmetic according to any one of [1] to [7], wherein the content of the component (A) is 1% by mass to 20% by mass.
[9] The water-in-oil emulsified cosmetic according to any one of [1] to [8], wherein the water content is 30% by mass to 59% by mass.

The water-in-oil emulsified cosmetic according to one aspect of the present invention has a high UV protection effect, is excellent in stability over time, and has a good moisturizing and sticky feeling.

According to the water-in-oil emulsified cosmetic according to one aspect of the present invention, it is possible to reduce the occurrence of powdery skin and dryness after application, and to have a good feeling of use. It can be expected to be used on a daily basis regardless of. The water-in-oil emulsified cosmetic according to one aspect of the present invention is excellent in stability over time, and therefore can be expected to be used and stored for a long period of time.

According to the water-in-oil emulsified cosmetic according to one aspect of the present invention, cosmetic base products, foundation products, face color products, concealer products, sunscreen products, etc. that exhibit dosage forms such as creams, emulsions, liquids, and gels. By taking various cosmetic forms, it can be expected to reduce or prevent the adverse effects on the skin caused by the user's sunburn and ultraviolet rays.

Hereinafter, the details of the water-in-oil emulsified cosmetic, which is one aspect of the present invention, will be described, but the technical scope of the present invention is not limited only to the matters of this item, and the present invention aims at its purpose. Various aspects can be taken as long as they are achieved.

Unless otherwise specified, the terms used herein are used in the sense commonly used by those skilled in the art of cosmetics and should not be construed as having an unreasonably limited meaning. Moreover, since the speculations and inferences made in the present specification are based on the knowledge and experience of the present inventors, the technical scope of the present invention is bound only by such speculations and inferences. It is not something that is done.

For example, "and / or" means any one, or any combination of two or more, or all combinations of a plurality of related items listed.

"Content" is synonymous with concentration and means the ratio of the amount of the ingredient to the total amount of the water-in-oil emulsified cosmetic. In the present specification, unless otherwise specified, the unit of content means "mass% (wt%)".

"~" In the numerical range is a range including the numerical values before and after that, and for example, "0% by mass to 100% by mass" means a range of 0% by mass or more and 100% by mass or less. .. The number of digits of the integer value and the number of digits of the significant figures match. For example, 1 significant digit is 1 digit and 10 significant digit is 2 digits. In addition, the number of digits after the decimal point and the number of significant digits are the same for decimal numbers. For example, 0.1 significant digit is 1 digit and 0.10 significant digit is 2 digits.

"Usage" means the feeling of moisture, stickiness, or both of these when touching the skin after applying the water-in-oil emulsified cosmetic. In addition, "feeling moisturized" refers to the feeling of having a moist and fresh impression when touching the skin after applying the water-in-oil emulsified cosmetic. "Feeling sticky" means that when the skin is touched after applying the water-in-oil emulsified cosmetic, it has a weight peculiar to oil and is sticky. The usability can be evaluated and confirmed by the usability sensory evaluation described in Examples described later.

"(Meta) acrylic acid" is a general term that includes acrylic acid and methacrylic acid.

The water-in-oil emulsified cosmetic according to one aspect of the present invention comprises a hydrophobic surface-treated fine particle metal oxide (component (A)), an alkyl-unmodified and polyether-modified silicone (component (B)), and a poly. It contains at least a glycerin fatty acid ester (component (C)) and a triester (component (D)).

The water-in-oil emulsified cosmetic according to one aspect of the present invention is classified into three specific embodiments according to the component (B), the component (C), and the ratio of the component (B) to the component (C). That is, the water-in-oil emulsified cosmetic of the first aspect of the present invention contains the components (A) to (D), and the content of the component (B) is 3.0% by mass or more. The water-in-oil emulsified cosmetic of the second aspect of the present invention contains the components (A) to (D), and the content of the component (C) is 0.01 to 1.4%. The water-in-oil emulsified cosmetic according to the third aspect of the present invention contains the components (A) to (D), and the ratio of the component (B) to the component (C) (component (B) / component (C)). )) Is 2.0 or more. In the present specification, the term "water-in-oil emulsified cosmetics according to one aspect of the present invention" collectively refers to the water-in-oil emulsified cosmetics according to the first, second and third aspects of the present invention. ..

The hydrophobic surface-treated fine particle metal oxide of the component (A) is not particularly limited as long as it is usually used as an ultraviolet scattering agent in cosmetics, and its shape, method of hydrophobic surface treatment, and metal oxide. The type, the shape of the fine particles, the particle size, and the like can be appropriately selected. The hydrophobized surface-treated fine particle metal oxide of the component (A) is, for example, spherical, rod-shaped, needle-shaped, spindle-shaped, plate-shaped or amorphous, and average particles. Examples thereof include zinc oxide, titanium oxide, and cerium oxide having a primary particle diameter of 100 nm or less, but are not limited thereto. However, for the hydrophobic surface-treated fine particle metal oxide of the component (A), the coloring pigment having an average particle size of 150 nm or more with respect to the primary particle size is excluded. The average particle size can be measured by calculating the number average diameter by image analysis of a transmission electron micrograph.

The method of hydrophobizing surface treatment of fine metal oxides is not particularly limited, and for example, silica treatment with hydrous silica, silica, etc .; methylhydrogenpolysiloxane, methylhydrogenpolysiloxane / dimethylpolysiloxane copolymer, dimethylpolysiloxane, methylpolysiloxane. Silicone treatment with, etc .; Aluminum treatment with aluminum hydroxide, aluminum oxide, etc .; Silane treatment with triethoxycaprylylsilane, octyltriethoxysilane, hexyltrimethoxysilane, etc .; Fatty acid treatment with palmitic acid, stearic acid, isostearic acid, etc.; Fatty acid Metal soap treatment with alkali metal salt or alkaline earth metal salt, etc .; Fluorine treatment with perfluoroalkyl phosphate, perfluoroalkyl phosphate diethanolamine salt, perfluoroalkyl trimethoxysilane, etc., and one of these Can be used alone or in combination of two or more. Among the above surface treatments, the cosmetics field has abundant experience in hydrophobizing surface treatments of fine particle metal oxides, and the photocatalytic action of fine particle metal oxides can be reduced to reduce the effect on the applied skin. From this point of view, silica treatment, silicone treatment, aluminum treatment and silane treatment are preferable, and a combination of these treatments is more preferable.

The hydrophobic surface-treated fine particle metal oxide of the component (A) may be a hydrophobic surface-treated fine particle metal oxide according to a conventional method, or may be commercially available. Examples of commercially available hydrophobized surface-treated fine particle metal oxides include "ST-457SA" (manufactured by Titanium Industries), "MT-100Z" (manufactured by TAYCA), and "MT-150EX" (manufactured by TAYCA). (Manufactured by), "MZY-303S" (manufactured by TAYCA), "LT-050" (manufactured by TAYCA), "LT-051" (manufactured by TAYCA), "LZ-014" (manufactured by TAYCA), "LZ- 021 "(manufactured by TAYCA)," FLT-01 "(manufactured by TAYCA)," FLZ-01 "(manufactured by TAYCA)," FINEX-25-LPT "(manufactured by Sakai Chemical Industry)," STR-40- LP "(manufactured by Sakai Chemical Industry Co., Ltd.)," DIS-11A "(manufactured by Sakai Chemical Industry Co., Ltd.)," DIS-12C "(manufactured by Sakai Chemical Industry Co., Ltd.)," DIF-AW4 "(manufactured by Sakai Chemical Industry Co., Ltd.)," Examples include, but are not limited to, "DIF-3W4" (manufactured by Sakai Chemical Industry Co., Ltd.), "SPD-T6" (manufactured by Shinetsu Chemical Industry Co., Ltd.), and "SPD-Z6" (manufactured by Shinetsu Chemical Industry Co., Ltd.).

The content of the component (A) is not particularly limited as long as it has a light scattering or light reflection effect, but is, for example, 0.1% by mass or more, and has good dispersibility and good UV protection. From the viewpoint of obtaining the effect, 1% by mass to 20% by mass is preferable, and 5% by mass to 15% by mass is more preferable.

The alkyl-unmodified and polyether-modified silicone of the component (B) is not particularly limited as long as it is a commonly known polyether-modified silicone and has not been alkyl-modified. The alkyl-unmodified and polyether-modified silicone has a structure in which a polyether chain is added as a side chain and an alkyl chain is not added as a side chain to the silicone chain which is the main chain. However, the silicone chain may be either a straight chain or a branched chain. The component (B), together with the component (C) and the component (D), imparts good aging stability and a feeling of use to the water-in-oil emulsified cosmetic while exhibiting the ultraviolet protection effect of the component (A). Works like. Even with a polyether-modified silicone, such a function cannot be obtained with lauryl PEG-9 polydimethylsiloxyethyl dimethicone, which is an alkyl-modified.

Examples of the component (B) include alkyl-unmodified and polyether-modified silicone having an HLB (hydrophilic body oil balance) value of 1 to 7, and the component (A), the component (C) and the component (D) are used. From the viewpoint of compatibility with and exhibiting the above functions, alkyl-unmodified and polyether-modified silicones having an HLB value of 3 to 6 are preferable, and PEG-3 dimethicone, PEG-9 dimethicone and PEG having an HLB value of 3 to 6 are preferable. -10 dimethicone, PEG / PPG-19 / 19 dimethicone and PEG-9 polydimethylsiloxyethyl dimethicone are more preferred, and PEG-10 dimethicone and PEG-9 polydimethylsiloxyethyl dimethicone with HLB values of 3-6 are even more preferred. As the component (B), one of the above-mentioned ones may be used alone, or two or more kinds thereof may be used in combination.

The alkyl-unmodified and polyether-modified silicone of the component (B) may be manufactured according to a conventional method or may be commercially available. Examples of commercially available alkyl-unmodified and polyether-modified silicones include "KF-6015" (HLB value: 4.5; manufactured by Shin-Etsu Chemical Co., Ltd.) and "KF-6017" (HLB value: 4.5; Shin-Etsu Chemical Co., Ltd.), "KF-6017P" (HLB value: 4.5; manufactured by Shin-Etsu Chemical Co., Ltd.), "KF-6028" (HLB value: 4.0; manufactured by Shin-Etsu Chemical Co., Ltd.), "KF-" 6028P "(HLB value: 4.0; manufactured by Shin-Etsu Chemical Co., Ltd.)," BY 11-030 "(HLB value: 3.0; manufactured by Toray Dow Corning Co., Ltd.)," ES-5612 FORMULATION AID "(HLB value: 4.0; manufactured by Toray Dow Corning Co., Ltd.), but is not limited to these. The HLB value of the commercially available product indicates the HLB value nominally specified by the manufacturing and sales company.

By blending the content of the component (B) together with the component (A), the component (C) and the component (D), the UV protection effect is exhibited against the water-in-oil emulsified cosmetic according to one aspect of the present invention. However, it is an amount that can impart stability over time and a feeling of use. The content of the component (B) in the water-in-oil emulsified cosmetic of the first aspect of the present invention may be 3.0% by mass or more, preferably 3.0% by mass to 10% by mass, and more. It is preferably 3.0% by mass to 5% by mass, and more preferably 3.0% by mass to 4% by mass. The content of the component (B) in the water-in-oil emulsified cosmetics according to the second and third aspects of the present invention is, for example, 0.1% by mass or more, which is better than the water-in-oil emulsified cosmetics. From the viewpoint of imparting stability over time and / or a feeling of use, it is preferably 1% by mass to 10% by mass, more preferably 3.0% by mass to 5% by mass, and further preferably 3.0% by mass. % To 4% by mass.

The polyglycerin fatty acid ester of the component (C) is not particularly limited as long as it is an esterification product of polyglycerin obtained by polymerizing glycerin as is usually known and a fatty acid, and may be any of monoester, diester and polyester. You may. Ingredient (C), together with ingredient (B) and ingredient (D), imparts good temporal stability and usability to the water-in-oil emulsified cosmetic while exhibiting the ultraviolet protection effect of the ingredient (A). Works like. Even with the same fatty acid ester, sorbitan sesquiisostearate does not provide such a function.

Examples of the component (C) include polyglycerin fatty acid esters having an HLB value of 1 to 7, and the component (C) exhibits compatibility with the component (A), the component (B) and the component (D), and exhibits the above-mentioned functions. From this point of view, a polyglycerin fatty acid ester having an HLB value of 3 to 6 is preferable, and a polyglyceryl-2 triisostearate having an HLB value of 3 to 6, polyglyceryl diisostearate-2, polyglyceryl diisostearate-2, polyglyceryl-2 distearate, Polyglyceryl-3 diisostearate-3, polyglyceryl distearate-3, polyglyceryl stearate-2, polyglyceryl pentastearate-10, polyglyceryl pentaisostearate-10, polyglyceryl pentaoleate-10 and polyglyceryl polylysinoleate-6 are more preferred, HLB. Polyglyceryl-2 diisostearate having a value of 3 to 6 is more preferable. As the component (C), one of the above-mentioned ones may be used alone, or two or more kinds thereof may be used in combination.

The polyglycerin fatty acid ester of the component (C) may be either produced according to a conventional method or commercially available. Examples of commercially available polyglycerin fatty acid esters include "EMALEX TISG-2" (HLB value: 3; manufactured by Nippon Emulsion Co., Ltd.), "EMALEX DISG-2" (HLB value: 4; manufactured by Nippon Emulsion Co., Ltd.), and ". "EMALEX DISG-2EX" (HLB value: 4; manufactured by Nippon Emulsion Co., Ltd.), "EMALEX DSG-2" (HLB value: 4; manufactured by Japan Emulsion Co., Ltd.), "EMALEX DISG-3" (HLB value: 5; manufactured by Japan Emulsion Co., Ltd.) ), "EMALEX DISG-3EX" (HLB value: 5; manufactured by Nippon Emulsion Co., Ltd.), "EMALEX DSG-3" (HLB value: 5; manufactured by Nippon Emulsion Co., Ltd.), "NIKKOL DGMS" (HLB value: 5; Nikko) Chemicals), "NIKKOL Decaglyn 5-SV" (HLB value: 3.5; manufactured by Nikko Chemicals), "NIKKOL Decaglin 5-ISV" (HLB value: 3.5; manufactured by Nikko Chemicals), "NIKKOL Decaglyn" "5-OV" (HLB value: 3.5; manufactured by Nikko Chemicals Co., Ltd.) and the like can be mentioned, but the present invention is not limited thereto.

By blending the content of the component (C) together with the component (A), the component (B) and the component (D), an ultraviolet protection effect is exhibited against the water-in-oil emulsified cosmetic according to one aspect of the present invention. However, it is an amount that can impart stability over time and a feeling of use. The content of the component (C) in the water-in-oil emulsified cosmetic according to the second aspect of the present invention may be 0.01% by mass to 1.4% by mass, preferably 0.1% by mass to 1. It is 2% by mass, more preferably 0.2% by mass to 1.1% by mass. The content of the component (C) in the water-in-oil emulsified cosmetics according to the first and third aspects of the present invention is, for example, 0.01% by mass to 5% by mass, and is used in the water-in-oil emulsified cosmetics. On the other hand, from the viewpoint of imparting good stability over time and / or a feeling of use, it is preferably 0.01% by mass to 1.4% by mass, and more preferably 0.1% by mass to 1.2% by mass. Yes, more preferably 0.2% by mass to 1.1% by mass.

Ingredient (C) is closely related to Ingredient (B) and can affect the stability over time and / or the feeling of use in the water-in-oil emulsified cosmetic of one aspect of the present invention. The ratio of the component (B) to the component (C) in the water-in-oil emulsified cosmetic according to the third aspect of the present invention (component (B) / component (C)) may be 2.0 or more, preferably 2.0 or more. It is 2.0 to 20, more preferably 2.5 to 15. The component (B) / component (C) in the water-in-oil emulsified cosmetics according to the first and second aspects of the present invention is, for example, 0.1 to 100, which is relative to the water-in-oil emulsified cosmetics. From the viewpoint of imparting good stability over time and / or a feeling of use, it is preferably 2.0 to 100, more preferably 2.0 to 20, and even more preferably 2.5 to 15.

The triester of the component (D) is not particularly limited as long as it is a chemical substance having three ester bonds in the molecule known as a triester in the cosmetic field. Ingredient (D), together with ingredient (B) and ingredient (C), imparts good temporal stability and usability to the water-in-oil emulsified cosmetic while exhibiting the ultraviolet protection effect of the ingredient (A). Works like.

As the component (D), for example, dipentaerythritol fatty acid ester such as dipentaerythrityl tripolyhydroxystearate, triethylhexanoin, tri (caprylic acid / capric acid) glyceryl, triisosteare, diglyceryl triisostearate, trimethylol triethylhexanoate. Examples thereof include propane and trimethyl propane triisostearate, but dipentaerythritol fatty acid ester and triethylhexa from the viewpoint of compatibility with component (A), component (B) and component (D) and exhibiting the above functions. Noin is preferred, and dipentaerythrityl tripolyhydroxystearate and triethylhexanoin are more preferred. As the component (D), one of the above-mentioned ones may be used alone, or two or more kinds thereof may be used in combination.

The triester of the component (D) may be either produced according to a conventional method or commercially available. Examples of commercially available triesters include "Saracos WO-6" (manufactured by Nisshin Oillio Group), "TIO" (manufactured by Nisshin Oillio Group), and "ODO" (manufactured by Nisshin Oillio Group). "Saracos 3318" (manufactured by Nisshin Oillio Group), "Cosmall 43V" (manufactured by Nisshin Oillio Group), "Neosolue-MCT" (manufactured by Nippon Fine Chemical Co., Ltd.), "IOTG" (manufactured by Nippon Fine Chemical Co., Ltd.) (Manufactured by Nippon Fine Chemical Co., Ltd.), "NS-308" (manufactured by Nippon Fine Chemical Co., Ltd.), etc., but are not limited thereto.

By blending the content of the component (D) together with the component (A), the component (B) and the component (C), an ultraviolet protective effect is exhibited against the water-in-oil emulsified cosmetic according to one aspect of the present invention. However, the amount is not particularly limited as long as it can impart stability over time and a feeling of use, but is, for example, 0.1% by mass to 10% by mass, preferably 1% by mass to 8.5% by mass. , More preferably 4% by mass to 7.5% by mass. If the content of the component (D) is less than 0.1% by mass or more than 10% by mass, compatibility with other components and / or stability over time may be impaired, which is not preferable. However, the content of the component (D) can be appropriately set depending on the contents of the component (A), the component (B) and the component (C).

The water-in-oil emulsified cosmetic according to one aspect of the present invention may contain other components in addition to the components (A) to (D) as long as the problems of the present invention can be solved.

Other components are not particularly limited, and examples thereof include components used in ordinary water-in-oil emulsified cosmetics, and more specifically, bases such as water and components other than components (B) to (D). Other oily ingredients, moisturizers, refreshing agents, preservatives, chelating agents, surfactants, pH adjusters, antioxidants, feel improvers, UV absorbers, thickeners, whitening agents, vitamins, and various other medicinal ingredients , Powders, fragrances, coloring materials, etc. The contents of other components can be appropriately set by those skilled in the art as long as they do not interfere with solving the problems of the present invention. Some of the other ingredients are listed below, but these are examples only and are not limited.

Examples of other oily components include oily emollient components, and preferably oily emollient components that are liquid or semi-solid at room temperature (25 ° C.), which are usually used for water-in-oil emulsified cosmetics. Specific examples of the oily emollient component as another oily component include silicone oils such as (dimethicone / vinyldimethicone) crosspolymer, cyclopentasiloxane, dimethylpolysiloxane, dimethylcyclopolysiloxane, and methylphenylpolysiloxane; fluoropolyether and par. Fluorine oils such as fluoroalkyl ether silicone; olive oil, jojoba oil, lavender oil, evening primrose oil, avocado oil, camellia oil, turtle oil, macadamian nut oil, corn oil, minced oil, rapeseed oil, egg yolk oil, sesame oil, persic oil , Wheat germ oil, Southern ka oil, Himasi oil, Amani oil, Saflower oil, Cotton seed oil, Eno oil, Soybean oil, Peanut oil, Tea seed oil, Kaya oil, Rice bran oil, Shinagiri oil, Japanese millet oil, Germ oil, etc. Natural oily components and the like can be mentioned, but the present invention is not limited to these. As the oily emollient component other than the component (A), one of the above-mentioned ones can be used alone, or two or more kinds can be used in combination. The content of the oily emollient component as the other oily component is preferably less than 30% by mass.

Moisturizers include, for example, glycerin, diglycerin, trehalose, butylene glycol (BG), polyquaternium-51, polyquaternium-61, xylitol, maltitol, maltose, sorbitol, glucose, fructose, hydrolyzed elastin, sodium lactate, cyclodextrin. , Pyrrolidone carboxylic acid and the like, and one of these can be used alone or in combination of two or more. The content of the moisturizer is preferably 0% by mass to 15% by mass.

Examples of preservatives include paraoxybenzoic acid esters such as propylparaben and methylparaben, benzoic acid, salicylic acid, phenolic acid, sorbic acid, parachlormethacresol, hexachlorophene, benzalkonium chloride, chlorhexidine chloride, trichlorocarbanilide, and photosensitive agents. Element, phenoxyethanol and the like can be mentioned, and one of these can be used alone or in combination of two or more. The content of the preservative is preferably 0% by mass to 1% by mass.

Examples of the antioxidant include vitamin E and derivatives thereof such as dibutylhydroxytoluene, butylhydroxyanisole, and tocopherol, thiotaurine, mematsuyoigusa extract, β-carotene, catechin compound, flavonoid compound, polyphenol compound, and the like. The seeds can be used alone or in combination of two or more. The content of the antioxidant is preferably 0% by mass to 1% by mass.

Examples of thickeners include organically modified clay minerals such as bentonite, hectrite, disteardimonium hectrite, and organically modified bentonite; hyaluronic acid, sodium hyaluronate, acetylated hyaluronic acid, acetylated sodium hyaluronate, chondroitin sulfate. , Water-soluble polysaccharides such as sodium chondroitin sulfate, fucoidan, tuberose polysaccharide, xanthan gum; natural polymers such as carrageenan and alginic acid; semi-synthetic polymers such as sodium carboxymethyl cellulose; Examples thereof include synthetic polymers such as acrylate-based polymers such as meta) acrylic acid / (meth) alkyl acrylate copolymers, and one of these can be used alone or in combination of two or more. The content of the thickener is preferably 0% by mass to 5% by mass.

Examples of the feel improving agent include boron nitride, polymethylsilsesquioxane, (vinyldimethicone / methicone silsesquioxane) crosspolymer, (diphenyldimethicone / vinyldiphenyldimethicone / silsesquioxane) crosspolymer, nylon-6. , Nylon-11, Nylon-12, Nylon-6,6 and the like, and one of these can be used alone or in combination of two or more. The content of the feel improving agent is preferably 0% by mass to 5% by mass.

Examples of the coloring material include inorganic pigments such as titanium oxide and iron oxide; organic synthetic pigments such as dyes and organic pigments; natural pigments, etc., and one of these may be used alone or in combination of two or more. it can. The content of the coloring material is preferably 0% by mass to 0.5% by mass.

The water-in-oil emulsified cosmetic according to one aspect of the present invention is not particularly limited in its function and effect as long as it is used as a cosmetic. The water-in-oil emulsified cosmetic according to one aspect of the present invention has a viscosity fluctuation rate of less than 60% and excellent temporal stability, for example, according to the temporal stability test described in Examples described later. The viscosity volatility is preferably less than 50%, more preferably less than 40%, from the viewpoint of having. The lower limit of the viscosity volatility is not particularly limited, and is typically 0%.

The water-in-oil emulsified cosmetic according to one aspect of the present invention is evaluated as "○" or "Δ" in terms of usability by, for example, evaluation of usability regarding "moisture" and "stickiness" described in Examples described later. From the viewpoint of having an excellent usability, it is preferable to evaluate it as “◯”. The water-in-oil emulsified cosmetic according to one aspect of the present invention is characterized in that it feels moist when applied to the skin and has a good feeling of use with less stickiness.

A more specific aspect of the water-in-oil emulsified cosmetic according to one aspect of the present invention is that the component (A) is 1% by mass to 20% by mass, the component (B) is 3.0% by mass to 10% by mass, and the component. (C) is contained in an amount of 0.01% by mass to 1.4% by mass and component (D) in an amount of 1% by mass to 8.5% by mass, and component (B) / component (C) is contained in an amount of 2.0 to 8.5% by mass. When the content is 20, the water-in-oil emulsified cosmetic has excellent stability over time, is moisturized, is less sticky, and has a good usability, but is not limited thereto.

The water-in-oil emulsified cosmetic according to one aspect of the present invention is excellent in stability over time even if the content of water as a base is large by containing the components (A) to (D). There is a feature in. However, if the water content is excessive, the stability over time and / or the feeling of use may decrease. Therefore, the water content in the water-in-oil emulsified cosmetic according to one aspect of the present invention is 60% by mass. It is preferably less than, more preferably 30 to 59% by mass.

The method for producing a water-in-oil emulsified cosmetic according to one aspect of the present invention is not particularly limited, and examples thereof include the methods described in Examples described later. That is, each of the phase A containing the components (A) to (D) and other lipophilic components and the phase B containing the base water and the hydrophilic component are uniformly heated according to a conventional method. It is prepared by mixing or dispersing, then the A phase is heated to 40 ° C. to 60 ° C., and then the B phase is added to the A phase and mechanically subjected to a high-speed stirring treatment using a homomixer or the like. By gently stirring the obtained emulsion until the temperature reaches 20 ° C. to 40 ° C., the water-in-oil emulsified cosmetic according to one aspect of the present invention can be obtained.

The water-in-oil emulsified cosmetic according to one aspect of the present invention is not particularly limited in terms of its use and dosage form, and examples thereof include skin care cosmetics, makeup cosmetics, fragrance cosmetics, and body care cosmetics. Examples include creams, emulsions, makeup bases, beauty liquids, sunscreen gels, foundations, hand creams, concealers, blushers, eye shadows, lipsticks, sunscreen creams, and all-in-one cosmetics. The water-in-oil emulsified cosmetic according to one aspect of the present invention has excellent stability over time and is sticky while being moisturized by forming a dosage form having a certain viscosity such as cream, milky lotion, and gel. It is preferable because it can have a small and good feeling of use. Further, the water-in-oil emulsified cosmetic according to one aspect of the present invention is expected to have an ultraviolet protection effect based on the contained component (A), and is a cosmetic for ultraviolet protection or sunscreen, specifically, a makeup base product. , Skin care products, foundation products, face color products, concealer products, sunscreen products are preferable.

Hereinafter, the present invention will be described in more detail with reference to Examples, but the present invention is not limited to these Examples, and the present invention may take various aspects as long as the problems of the present invention can be solved. it can.

[1. Preparation of test cosmetics]
According to the formulation shown in Table 1, water-in-oil emulsified cosmetics of Examples 1 to 9 and Comparative Examples 1 to 6 were prepared by the following procedure. The numerical values in the table represent mass% (wt%).

Each of the A phase and the B phase in the table was prepared by heating and uniformly mixing each component. Next, after heating the A phase to 50 ° C., the B phase is added to the A phase, and a homomixer (“Lab Solution”; manufactured by Primix Corporation) is used under the conditions of 5,000 rpm and 10 minutes. An emulsion was obtained by subjecting it to the high-speed stirring treatment. The obtained emulsion was gently stirred until the temperature reached 30 ° C. to obtain a water-in-oil emulsified cosmetic.

"Surface-treated titanium oxide (fine particles)" in the table represents titanium oxide having an average particle size of 100 nm or less with respect to the primary particle size, which has been surface-treated with hydrous silica, aluminum hydroxide and hydrogen dimethicone.
"Surface-treated zinc oxide (fine particles)" in the table represents zinc oxide having an average particle size of 100 nm or less with respect to the primary particle size, which has been surface-treated with hydrous silica and hydrogen dimethicone.
"Surface-treated titanium oxide (pigment)" and "surface-treated iron oxide (pigment)" in the table refer to titanium oxide and iron oxide having a hydrophobic surface treatment and an average particle size of 150 nm or more for the primary particle size, respectively. Represent.

[2. Evaluation method]
(2-1) Stability over time For the test cosmetics, the viscosity immediately after preparation and the viscosity after storage for a predetermined period were measured by the following procedure, and the volatility (%) of the viscosity after storage with respect to the viscosity immediately after preparation was determined. , The stability over time was evaluated according to the following criteria.

A BH type viscometer (“VISCOMETER BH-II”; manufactured by Toki Sangyo Co., Ltd.) was used for the viscosity measurement. The measurement conditions were No. 7 rotor, 4 rpm, and 1 minute. Test cosmetics immediately after preparation (all), test cosmetics (Examples 2 to 4 and 8 to 9 and Comparative Examples 3 and 6) after storage at 20 ° C. for 1 month, and conditions at 20 ° C. for 6 months. The viscosity values of the test cosmetics (Examples 1 and 5 to 7 and Comparative Examples 1 to 2 and 4 to 5) after being stored in 1 minute after the start of measurement were read.

The evaluation criteria for stability over time were as follows.
◯: Viscosity volatility is less than 40% Δ: Viscosity volatility is 40% or more and less than 60% ×: Viscosity volatility is 60% or more

(2-2) Usability For 5 panelists trained in sensory evaluation of cosmetics, by applying the test cosmetics directly to the skin, the "moisture" and "stickiness" to the skin are as follows. The average score and standard deviation between the panelists were calculated by scoring according to the standard of.
5: Moisture is felt well and stickiness is not felt 4: Moisture is felt and stickiness is not felt 3: Moisture is felt and stickiness is slightly felt 2: Moisture is slightly felt Feeled and slightly sticky 1: No moisture and stickiness

In addition, the average score between panelists is 3.0 or more as "○", and the average score between panelists is less than 3.0 and none of the panelists give 1 point as "△". The ones that one or more panelists gave 1 point were evaluated as "x".

(2-3) Comprehensive evaluation Based on the evaluation results of stability over time and usability, a comprehensive evaluation was made according to the following criteria.
◯: Evaluation of stability over time and usability was “○” Δ: Evaluation of stability over time and / or usability was “△”, and there was no “×” in any of the evaluations. Tamono ×: Evaluation of stability over time or usability was “×”

[3. Evaluation results]
Table 1 shows the evaluation results of the stability and usability over time and the comprehensive evaluation results of the water-in-oil emulsified cosmetics of Examples 1 to 9 and the water-in-oil emulsified cosmetics of Comparative Examples 1 to 6.

The water-in-oil emulsified cosmetics of Comparative Examples 1 to 6 were evaluated as "x" for stability over time or usability, whereas the water-in-oil emulsified cosmetics of Examples 1 to 9 were evaluated. The cosmetics had good stability over time or a feeling of use.

In particular, the water-in-oil emulsified cosmetics of Examples 1 to 4 were evaluated as "○" in terms of both stability over time and usability, and the hydrophobized surface-treated fine particle metal oxide was highly concentrated. It was found that it is an excellent water-in-oil emulsified cosmetic that is excellent in stability over time, has a good feeling of use, and does not become dry or powdery on the applied skin.

Hereinafter, as one aspect of the present invention, examples of prescribing water-in-oil emulsified cosmetics having a comprehensive evaluation of “○” or “Δ” will be given, and the technical scope of the present invention includes these prescription examples. Not limited.

(Prescription Example 1) With respect to the components listed in the makeup base table 2, the components (1) to (13) were heated and uniformly mixed to obtain an oil phase. After the components (14) to (17) were heated and uniformly mixed, they were put into an oil phase heated to 50 ° C., and then stirred to obtain an emulsion. The obtained emulsion was gently stirred to 30 ° C. to obtain a makeup base.

(Prescription Example 2) With respect to the components listed in Foundation Table 3, components (1) to (15) were heated and uniformly mixed to obtain an oil phase. After the components (16) to (19) were heated and uniformly mixed, they were put into an oil phase heated to 50 ° C., and then stirred to obtain an emulsion. The obtained emulsion was gently stirred to 30 ° C. to obtain a foundation.

(Prescription Example 3) With respect to the components listed in Sunscreen Table 4, components (1) to (11) were heated and uniformly mixed to obtain an oil phase. After the components (12) to (15) were heated and uniformly mixed, they were put into an oil phase heated to 50 ° C., and then stirred to obtain an emulsion. The obtained emulsion was gently stirred to 30 ° C. to obtain a sunscreen.

The water-in-oil emulsified cosmetic according to one aspect of the present invention is excellent in stability over time and has a good usability while exhibiting a high ultraviolet protection effect. It can be used as cosmetics such as foundation products, face color products, concealer products, and sunscreen products. By using the water-in-oil emulsified cosmetic according to one aspect of the present invention, the user can comfortably reduce or prevent the adverse effects on the skin caused by sunburn and ultraviolet rays on a daily basis. ..

Claims (8)

(A) Hydrophobicized surface-treated fine particle metal oxide,
(B) Alkyl-unmodified and polyether-modified silicone,
(C) Polyglycerin fatty acid ester and
Contains a (D) triesters, and state, and are content 3.0% by mass or more of said components (B),
The component (C) is a polyglycerin fatty acid ester selected from the group consisting of polyglyceryl-2 diisostearate and polyglyceryl-6 polylysinoleate.
The component (D) is a triester selected from the group consisting of dipentaerythritol fatty acid ester and triethylhexanoin.
A water content of 30 wt% Ru and 59% by mass, water-in-oil type emulsified cosmetic. (A) Hydrophobicized surface-treated fine particle metal oxide,
(B) Alkyl-unmodified and polyether-modified silicone,
(C) Polyglycerin fatty acid ester and
Contains a (D) triesters, and Ri content of 0.01 mass% to 1.4% by mass of the component (C),
The component (C) is a polyglycerin fatty acid ester selected from the group consisting of polyglyceryl-2 diisostearate and polyglyceryl-6 polylysinoleate.
The component (D) is a triester selected from the group consisting of dipentaerythritol fatty acid ester and triethylhexanoin.
The water content is 30% by mass to 59% by mass,
Lauryl PEG-9 Polydimethylsiloxyethyl Dimethicone-free , water-in-oil emulsified cosmetic. (A) Hydrophobicized surface-treated fine particle metal oxide,
(B) Alkyl-unmodified and polyether-modified silicone,
(C) Polyglycerin fatty acid ester and
(D) contains a triester, and state, and are percentage (component (B) / component (C)) is 2.0 or more of the said components to component (C) (B),
The component (C) is a polyglycerin fatty acid ester selected from the group consisting of polyglyceryl-2 diisostearate and polyglyceryl-6 polylysinoleate.
The component (D) is a triester selected from the group consisting of dipentaerythritol fatty acid ester and triethylhexanoin.
The water content is 30% by mass to 59% by mass,
Lauryl PEG-9 Polydimethylsiloxyethyl Dimethicone-free , water-in-oil emulsified cosmetic. The water-in-oil emulsified cosmetic according to any one of claims 1 to 3, wherein the component (D) is dipentaerythrityl tripolyhydroxystearate. The component (B) is any one of claims 1 to 4, wherein the component (B) is an alkyl-unmodified and polyether-modified silicone selected from the group consisting of alkyl-unmodified and polyether-modified silicones having an HLB value of 3 to 6. The listed water-in-oil emulsified cosmetics. The water-in-oil emulsified cosmetic according to any one of claims 1 to 5, wherein the component (B) is PEG-9 polydimethylsiloxyethyl dimethicone and PEG-10 dimethicone. The water-in-oil emulsified cosmetic according to any one of claims 1 to 6, wherein the content of the component (D) is 1% by mass to 8.5% by mass. The water-in-oil emulsified cosmetic according to any one of claims 1 to 7, wherein the content of the component (A) is 1% by mass to 20% by mass.