JP2019077624A - Oil-in-water type emulsion cosmetic - Google Patents

Abstract

To provide an oil-in-water type emulsion cosmetic comprising menthol, which does not impair a feeling of cold while being improved in sense of use such as stickiness.SOLUTION: There is provided an oil-in-water type emulsion cosmetic which comprises at least menthol, an oil agent for dissolving menthol and a surfactant, wherein oil particles composed of the oil agent dissolving menthol have a particle diameter of 700 nm or less and the ratio (the oil agent:the surfactant) of the content of the surfactant to the content of the oil agent is 20:1 to 1:20.SELECTED DRAWING: None

Description

  The present invention relates to an oil-in-water emulsified cosmetic with improved feeling of use such as stickiness and enhanced cold sensation.

  Conventionally, various cosmetic compositions containing an oil-soluble component are known. As a method of preparing such a cosmetic containing an oil-soluble component, the oil-soluble component is dissolved in a large amount of alcohol, or the oil-soluble component is dissolved in an oil and finely dispersed in an aqueous medium. There is known a method of making the obtained oil-in-water emulsion cosmetic. Among these, since the oil-in-water emulsion cosmetic is in the form of a gel, it can generally give a fresh feeling when applied to the skin, and only the oil-soluble component is dissolved in alcohol. It is pointed out that skin familiarity is better than cosmetics. In recent years, along with diversification of preference of consumers, in these oil-in-water emulsified cosmetics, it is required to blend menthol, which is a cooling agent, so as to obtain a better feeling of coolness and coolness.

  For example, Patent Document 1 discloses an oil-in-water emulsion cosmetic composition containing a nonionic surfactant, a silicone oil, and menthol. According to the oil-in-water emulsion cosmetic described in Patent Document 1, even after being applied to the skin and washed away with water, a persistent cool feeling is given.

JP, 2015-089878, A

  However, since the general oil-in-water type emulsion cosmetic including the oil-in-water type emulsion cosmetic described in Patent Document 1 contains the surfactant, it is derived from the surfactant after being applied to the skin. The feeling of stickiness etc. may occur. The feeling of use such as stickiness also causes the user to feel uncomfortable. For this reason, although attempts have been made to reduce the amount of surfactant used in oil-in-water emulsion cosmetic preparations, the amount of surfactant used in an oil-in-water emulsion cosmetic containing menthol is generally The amount is determined according to the amount of oil agent depending on the amount of menthol used, and in the case of providing an oil-in-water emulsified cosmetic having a certain degree of coolness, the amount of surfactant used is reduced. Was not easy. Therefore, the present invention has been made in view of the above problems, and is an menthol-containing oil-in-water emulsified cosmetic, which is improved in feeling of use such as stickiness, but is impaired in coolness. The object of the present invention is to provide an oil-in-water emulsion cosmetic.

  The inventors of the present invention conducted intensive studies in view of the above problems. As a result, it is possible to reduce the amount of surfactant used by refining the particle diameter of oil agent particles composed of oil agent in which menthol is dissolved using a wet micronization device, and oil-in-water type emulsion makeup It has been found that the feeling of use of the charge is improved. And, unexpectedly, when the oil agent particles are thus miniaturized, it is found that the cooling sensation due to menthol can be remarkably improved, and the present invention has been completed. Specifically, the present invention provides the following.

  (1) An oil-in-water emulsion cosmetic comprising at least menthol, an oil agent for dissolving menthol, and a surfactant, wherein the particle diameter of oil agent particles composed of an oil agent having menthol dissolved therein is 700 nm or less An oil-in-water emulsified cosmetic, wherein the ratio of the content of surfactant to the content of oil agent is 20: 1 to 1:20 (oil agent: surfactant).

  (2) The oil-in-water emulsified cosmetic according to (1), wherein the content of the surfactant relative to the total amount of the oil-in-water emulsified cosmetic is 0.1% by mass or more and 30% by mass or less.

  (3) The surfactant according to (1) or (2), wherein the surfactant is at least one selected from the group consisting of polyoxyethylene hydrogenated castor oil, polyoxyethylene alkyl ether and polyoxyethylene glycerin fatty acid ester Oil-in-water emulsified cosmetic.

  (4) The oil-in-water emulsified cosmetic according to any one of (1) to (3), wherein the content of the oil agent relative to the total amount of the oil-in-water emulsified cosmetic is 0.1% by mass or more and 20% by mass or less .

  (5) The oil-in-water emulsified cosmetic according to any one of (1) to (4), wherein the oil agent is neopentyl glycol dicaprate.

  In the oil-in-water emulsion cosmetic of the present invention, the amount of surfactant used is reduced by using a wet micronization device, and the particle diameter of oil agent particles composed of an oil agent in which menthol is dissolved is 700 nm or less. Since the oil-in-water emulsified cosmetic was applied to the skin, the feeling of use such as stickiness can be improved. In addition, the oil-in-water emulsion cosmetic of the present invention unexpectedly has a significantly improved feeling of cooling by menthol.

  Hereinafter, the present invention will be described in detail.

Oil-in-water emulsion cosmetic
The oil-in-water type emulsified cosmetic of the present invention contains at least menthol, an oil agent for dissolving menthol, and a surfactant, and oil agent particles composed of an oil agent having menthol dissolved therein dispersed in an aqueous medium It is

[menthol]
The oil-in-water emulsion cosmetic of the present invention contains menthol. As menthol, menthol which can usually be used in the cosmetic field can be used. Examples of such menthol include menthol organic acid esters such as l-menthol, dl-menthol, peppermint oil, menthyl lactate, menthyl acetate, menthyl pyrrolidone carboxylic acid (PCA), menthyl glyceryl ether, glycosides of menthol, etc. be able to.

(Content of menthol)
The content of menthol is preferably the content generally used in the oil-in-water emulsion cosmetic used for imparting a cool feeling, specifically, to the total amount of the oil-in-water emulsion cosmetic. It is preferable that it is 0.01 to 2.0 mass%, and it is more preferable that it is 0.1 to 1.0 mass%. By setting the content of menthol in the above range, it is possible to suppress skin irritation due to menthol while effectively giving a cold sensation to the user of the oil-in-water emulsified cosmetic. At the same time, the amount of oil used to dissolve menthol and the amount of surfactant used can be optimized to improve stickiness during use.

  In addition, when dissolving menthol in an oil, if necessary, finely divided menthol may be dissolved in a solvent described below.

[Oil agent]
As the oil agent, an oil agent that is liquid at ordinary temperature that is generally used for oil-in-water emulsion cosmetics can be used, and it is not particularly limited. As such an oil, for example, fats and oils, higher fatty acids, ester oils, hydrocarbon oils, higher alcohols, silicone oils and the like can be used.

(Fat and oil)
As fats and oils, for example, linseed oil, camellia oil, macadamia nut oil, corn oil, olive oil, avocado oil, sasanka oil, castor oil, safflower oil, pomegranate oil, cinnamon oil, jojoba oil, grape oil, sunflower oil, almond oil And rapeseed oil, sesame oil, wheat germ oil, rice germ oil, rice bran oil, cottonseed oil, soybean oil, peanut oil, tea seed oil, evening primrose oil and the like.

(Higher fatty acid)
Examples of higher fatty acids include heptanoic acid, octanoic acid, nonanoic acid, decanoic acid, pentadecanoic acid, heptadecanoic acid, nonadecanoic acid, isostearic acid, oleic acid, linoleic acid, linolenic acid, arachidonic acid and the like.

(Ester oil)
As ester oil, for example, pentaerythritol tetraoctanoate, cetyl octanoate, hexyl laurate, isopropyl myristate, octyldodecyl myristate, octyl palmitate, isopropyl isostearate, octyl isopalitate, isodecyl oleate, ethyl hexane Examples include cetyl acid and neopentyl glycol dicaprate.

(Hydrocarbon oil)
Examples of hydrocarbon oils include liquid paraffin, squalane, squalene, paraffin, isoparaffin, octane, decane, dodecane, isododecane, hexadecane, isohexadecane and the like.

(Higher alcohol)
Examples of higher alcohols include octyl alcohol, isostearyl alcohol, oleyl alcohol and the like.

(Silicone oil)
Examples of silicone oils include linear silicones such as dimethylpolysiloxane, methylphenylpolysiloxane and methylhydrogenpolysiloxane, and cyclic silicones such as octamethylcyclotetrasiloxane, decamethylcyclopentasiloxane and dodecamethylcyclohexasiloxane. It can be mentioned.

  In the present invention, among these oils, it is preferable to use an ester oil, a hydrocarbon oil and a higher alcohol, it is more preferable to use an ester oil, and it is particularly preferable to use neopentyl glycol dicaprate. In addition, about an oil agent, an individual thing may be used and 2 or more types may be mixed and used.

(Content of oil agent)
The content of the oil agent is preferably 0.1% by mass to 20% by mass, and more preferably 0.2% by mass to 10% by mass, with respect to the total amount of the oil-in-water emulsion cosmetic. . When the content of the oil agent is within the above range, while the required amount of menthol is sufficiently dissolved, the feeling of stickiness at the time of use is suppressed, and the feeling of use of the oil-in-water emulsion cosmetic is improved. Can.

(Particle diameter of oil agent particles)
In the oil-in-water type emulsified cosmetic of the present invention, the particle diameter of oil agent particles composed of an oil agent in which menthol is dissolved is 700 nm or less, preferably 100 nm or more and 600 nm or less, and 100 nm or more and 450 nm or less. Is more preferred. By making the particle diameter of the oil agent particles within the above range, the dispersibility of the oil agent particles is improved, so the ratio of the content of the surfactant to the oil agent content of the oil-in-water emulsion cosmetic is low. In addition to improving stickiness when using an oil-in-water emulsified cosmetic, it is possible to improve the feeling of use, and since fine oil particles are more likely to penetrate the skin, the cooling sensation of menthol is further enhanced. You can also

(Wet particle sizer)
In the present invention, when adjusting the particle diameter of the oil agent particles to 700 nm or less, the composition containing at least menthol, oil agent, surfactant, and water is finely divided at an ultrahigh pressure using a wet micronization device. It may be crushed. In this wet micronization apparatus, pressure is applied to the raw material composition, and the raw material solutions are caused to collide with each other at an ultrahigh pressure to obtain an oil-in-water emulsified cosmetic containing oil agent particles dispersed with a fine particle diameter. As a wet-type micronization apparatus that exerts such an effect, "Starburst" (trade name, manufactured by Sugino Machine Co., Ltd.), "Microfluidizer" (trade name, manufactured by Microfluidics), "Nanoveita" (Yoshida Machine Co., Ltd.) Kogyo Co., Ltd.), “Goulin Homogenizer” (APV Co., Ltd.), “homogenizer” (Sanwa Machine Co., Ltd.), “high pressure homogenizer” (Izumi Food Machinery Co., Ltd.) and the like can be mentioned.

[Surfactant]
The oil-in-water emulsion cosmetic of the present invention contains a surfactant. By containing the surfactant, the dispersed state of the finely dispersed oil agent particles can be maintained, and the oil-in-water emulsion cosmetic can be easily maintained in a gel-like property. As surfactants contained in the oil-in-water emulsion cosmetic of the present invention, anionic surfactants such as fatty acid soaps, alkyl ether carboxylates, polyoxyethylene alkyl ether phosphates, N-acyl taurine salts and the like; Imidazoline amphoteric surfactants, amphoteric surfactants such as betaine surfactants; sorbitan surfactants, polyglycerin fatty acid esters, propylene glycol fatty acid esters, alkyl glycosides, polyoxyethylene sorbitan surfactants, polyoxyethylene Glycerin fatty acid ester, polyoxyethylene propylene glycol fatty acid ester, polyoxyethylene hydrogenated castor oil, and derivatives thereof, glycerin alkyl ether, polyoxyethylene alkyl ether, pluronic surfactant, alkanolamide It can be mentioned nonionic surface active agents. Among these, nonionic surfactants are preferably used, and at least one selected from the group consisting of polyoxyethylene hydrogenated castor oil, polyoxyethylene alkyl ether, and polyoxyethylene glycerin fatty acid ester is used. Is more preferred.

(Content of surfactant)
The ratio of the content of surfactant to the content of oil agent is 20: 1 to 1:20, and preferably 10: 1 to 1: 5 in the ratio of oil agent: surfactant. Further, the content of the surfactant relative to the total amount of the oil-in-water emulsion cosmetic is preferably 0.1% by mass to 30% by mass, and more preferably 0.1% by mass to 5% by mass. preferable. By making the ratio of the content of the surfactant to the content of the oil agent and the content of the surfactant within the above ranges, it is possible to improve the dispersibility of the oil agent particles while maintaining the oil-in-water condition. The feel at the time of use of the emulsified cosmetic can be improved.

[Aqueous medium]
As the aqueous medium, mainly water can be used. The content of water is preferably 40% by mass or more and 90% by mass or less with respect to the total amount of the oil-in-water emulsion cosmetic.

[Other ingredients]
The oil-in-water emulsion cosmetic of the present invention can contain, in addition to the above components, conventionally known components conventionally used in the field of oil-in-water emulsion cosmetic. Examples of such components include alcohols, moisturizers, perfumes, preservatives, thickeners and the like.

(Alcohol)
Alcohols include monohydric lower alcohols such as ethanol and butanol; higher alcohols such as lauryl alcohol, stearyl alcohol, behenyl alcohol and batyl alcohol; sugar alcohols such as sorbitol, maltitol, mannitol and erythritol; lanolin alcohol, cholesterol, Other alcohols such as phytosterol can be mentioned.

(Moisturizer)
As a moisturizer, for example, low molecular weight polyethylene glycol, propylene glycol, 1,3-butylene glycol, polyhydric alcohol such as glycerin, chondroitin sulfate, hyaluronic acid, sodium lactate, pyrrolidone carboxylate, collagens, plant extract Etc. can be mentioned.

(Preservative)
Examples of preservatives include benzoic acid, salicylic acid, p-oxybenzoic acid esters (methylparaben, ethylparaben, butylparaben etc.), sorbic acid, parachlorometacresol, hexachlorophene, benzalkonium chloride, chlorhexidine chloride, trichlorocarbanilide , Photosensitizers, phenoxyethanol and the like.

(Thickener)
Examples of the thickener include one or more selected from acrylic acid-based water-soluble polymers and gum-based water-soluble polymers, and more specifically, polyacrylic acid and salts thereof, carbomers ( Acrylates / alkyl acrylate (C10-30)) crosspolymer, acrylamide / acrylamido-2-methylpropane sulfonate copolymer, hydroxyethyl acrylate / acryloyldimethyl taurate copolymer, acrylate / acryloyl dimethyl taurine co-polymer Polymers, acrylic acid amide / acrylic acid 2-methylpropane sulfonate copolymer, acryloyl dimethyl taurine salt / vinyl pyrrolidone copolymer etc., as well as gum arabic, tragacanth gum, guar gum, gellan gum, shea gum, carob gum, karaya gum, xanthan gum Etc It can gel.

  The contents of the various additives listed above may be adjusted appropriately as long as the object of the present invention is not impaired.

  Hereinafter, the present invention will be described in detail by way of examples. The present invention is not limited to the examples shown below.

Example 1
In preparing the premix using the components shown in Table 1, keep the vacuum vessel at 35 ° C., add menthol and dipropylene glycol, and then add surfactant and oil, and finally add water. It was thrown in. The mixture was roughly emulsified at 65 ° C. to 70 ° C., and then cooled to 35 ° C. Thereafter, the oil agent particles were refined using a wet micronization apparatus "Starburst" (trade name, manufactured by Sugino Machine Co., Ltd.) to obtain a premix containing fine oil agent particles. Subsequently, each component (except premix) shown in Table 2 is mixed in a vacuum kettle kept at 80 ° C., and then cooled to room temperature, and 12.1 parts by mass of the above premix is added, The total amount was about 50 parts by mass to obtain an oil-in-water emulsion cosmetic.

Example 2
An oil-in-water type in the same manner as in Example 1 except that PEG-40 hydrogenated castor oil, steareth-3, and PEG-20 glyceryl isostearate were not used in preparation of the premix, and polysorbate 60 was used. An emulsified cosmetic was obtained.

Comparative Example 1
The components shown in Table 1 were mixed in the same amounts as in Example 1 for preparation of the premix, but in the same manner as in Example 1 except that the oil agent particles were not micronized using a wet micronization apparatus An oil type emulsified cosmetic was obtained.

Comparative Example 2
In preparation of the premix, as shown in Table 3, the oil-in-water type emulsified cosmetic was prepared in the same manner as Comparative Example 1 except that the amount of surfactant used was 70: 3 with respect to the amount of oil agent used. Obtained.

Comparative Example 3
Preparation of the premix was carried out in the same manner as in Example 1, except that PEG-40 hydrogenated castor oil, steareth-3 and PEG-20 glyceryl isostearate were not used and polyglyceryl stearate was used. An oil-in-water emulsion cosmetic was obtained.

Comparative Example 4
Oil-in-water as in Example 1, except that PEG-40 hydrogenated castor oil, steareth-3, and PEG-20 glyceryl isostearate were not used in preparation of the premix, but using arachyl glucoside. An emulsion cosmetic was obtained.

<Evaluation>
[Particle diameter of oil agent particles]
The particle diameter of the oil agent particles of the obtained oil-in-water emulsion cosmetic was measured using a laser diffraction particle size distribution analyzer SALD-2300 (manufactured by Shimadzu Corporation). The results are shown in Table 4.

[Separation of aqueous medium and oil solution]
The presence or absence of separation between the aqueous medium and the oil was visually confirmed.

[Use feeling, cool feeling, etc.]
Twenty monitors were asked to use the oil-in-water emulsified cosmetics of Examples and Comparative Examples, and the feeling in use and the feeling of coolness were evaluated according to the following criteria. The results are shown in Table 4. In addition, with respect to the oil-in-water emulsion cosmetic of Example 1 and Comparative Example 1, the cooling sensation upon application, the cooling sensation strength immediately after application, the preference of cooling sensation, the durability of cooling sensation, the cooling sensation upon sweating The evaluations were made according to the criteria of “very feel (very good)”, “feel (good)”, “can't say either”, “do not feel too much (somewhat bad)”, and “do not feel (bad)”. The results are shown in Tables 5 and 6.

(Feeling of use)
:: A feeling of use is good, but 16 to 20. A: A feeling of use is good, but 11 to 15 people. △: A feeling of use is good, but 6 to 10 people. ×: A feeling of use is good, Not 5 people or less

(Cold feeling)
:: strong cool but 16 to 20 or less ○: strong cool, but 11 to 15 △: strong cool, but 6 to 10 or less ×: strong cool, Not 5 people or less

  As is clear from Examples 1 and 2, in the oil-in-water emulsion cosmetic of the present invention, the amount of surfactant used can be reduced by micronizing the oil agent particles, and water having excellent feeling in use An oil type emulsified cosmetic could be provided. Further, as can be seen from the comparison between the example and the comparative example 1, the coolness of the oil-in-water emulsion cosmetic was significantly improved by the particle diameter of the oil agent particles being micronized.

Claims (5)

An oil-in-water emulsion cosmetic comprising at least menthol, an oil agent for dissolving menthol, and a surfactant,
The particle size of oil agent particles composed of an oil agent in which menthol is dissolved is 700 nm or less,
An oil-in-water emulsified cosmetic, wherein the ratio of the content of surfactant to the content of oil agent is 20: 1 to 1:20 (oil agent: surfactant).   The oil-in-water emulsion cosmetic according to claim 1, wherein the content of the surfactant relative to the total amount of the oil-in-water emulsion cosmetic is 0.1% by mass or more and 30% by mass or less.   The oil-in-water type emulsified makeup according to claim 1 or 2, wherein the surfactant is at least one selected from the group consisting of polyoxyethylene hydrogenated castor oil, polyoxyethylene alkyl ether and polyoxyethylene glycerol fatty acid ester. Fee.   The oil-in-water type emulsion cosmetic according to any one of claims 1 to 3, wherein the content of the oil agent relative to the total amount of the oil-in-water type emulsion cosmetic is 0.1% by mass or more and 20% by mass or less.   The oil-in-water emulsified cosmetic according to any one of claims 1 to 4, wherein the oil agent is neopentyl glycol dicaprate.