WO2021153465A1 - Powder dispersion composition, emulsification composition, and cosmetic - Google Patents

Abstract

A composition obtained by dispersion of a metal oxide powder (D) in a medium containing a volatile oil (A), an ultraviolet ray absorber (B), and a polyglycerin-modified silicone (C), wherein the volatile oil (A) contains a volatile alkane oil (A1), and the value of a ratio of the contained amount of the volatile alkane oil (A1) with respect to the contained amount of the volatile oil (A) is not less than 0.5.

Description

Powder dispersion compositions, emulsified compositions, and cosmetics

The present invention relates to a powder dispersion composition, an emulsified composition, and a cosmetic.

As skin application products such as foundations and sunscreens, cosmetics containing metal oxide powders such as ultraviolet scattering agents and pigments are known. As such cosmetics, oil-based cosmetics using a powder-dispersed composition in which powder is dispersed in an oil-based medium, and further, using this powder-dispersed composition as a base, other components such as aqueous components are emulsified and mixed. There are emulsified cosmetics such as oil-in-water emulsified type or water-in-oil emulsified type obtained by the above. As the oil-based medium, a volatile oil component for imparting a refreshing feel is mainly used. For example, in Patent Document 1 and Patent Document 2, surface-treated fine metal oxides are used as a dispersant and a dispersant. A powder dispersion composition dispersed in a volatile oil and a cosmetic using the powder dispersion composition are disclosed.

Japanese Unexamined Patent Publication No. 2012-184178 Japanese Unexamined Patent Publication No. 2010-143852

It is also well known that UV absorbers are further added to improve the UV protection effect of skin application products. However, the addition of an ultraviolet absorber may deteriorate the powder dispersibility in the oil phase. As a result, it is known that the ultraviolet protection effect of the ultraviolet scattering agent is not sufficiently exhibited and that the color development property of the pigment is lowered. Further, when the powder dispersion composition is prepared by selecting the components with priority given to the dispersibility of the powder, the good tactile sensation of the cosmetic using the powder dispersion composition, particularly the refreshing sensation, may be impaired.

In view of the above points, one aspect of the present invention is to provide a powder dispersion composition in which an ultraviolet absorber is blended, the powder is well dispersed, and the powder is excellent in a refreshing feeling when blended in a cosmetic. do.

In order to solve the above problems, one aspect of the present invention is to (D) a metal oxide powder in a medium containing (A) a volatile oil, (B) an ultraviolet absorber, and (C) a polyglycerin-modified silicone. The (A) volatile oil contains (A1) volatile alcan oil, and the ratio of the content of the (A1) volatile alcan oil to the content of the (A) volatile oil is A powder dispersion composition having a value of 0.5 or more.

According to one aspect of the present invention, it is possible to provide a powder dispersion composition that contains an ultraviolet absorber, disperses the powder well, and has an excellent refreshing feeling when used in cosmetics.

Hereinafter, embodiments of the present invention will be described in detail, but the present invention is not limited to the following embodiments.

<Powder dispersion composition>
In one aspect of the powder dispersion composition according to this embodiment, (D) metal oxide powder is dispersed in a medium containing (A) volatile oil, (B) ultraviolet absorber, and (C) polyglycerin-modified silicone. (A) The volatile oil contains (A1) volatile alcan oil, and the value of the ratio of the content of (A1) volatile alcan oil to the content of (A) volatile oil. Is 0.5 or more.

In the present embodiment, the powder dispersion composition may be formed by dispersing the (D) metal oxide powder in a dispersion medium composed of substantially oily components. In this embodiment, 98% by mass or more, preferably 99% by mass or more of the dispersion medium is an oily component, and it is more preferable that all the dispersion mediums are oily components. The oily component may include a solid oily component at room temperature (25 ° C.) and a liquid oily component. In this embodiment, a dispersion medium to which a dispersant is added is referred to as a medium.

The powder dispersion composition according to this embodiment contains an ultraviolet absorber and the powder is well dispersed. Good dispersion of the powder or high dispersibility of the powder means that the powder does not agglomerate and is uniform, that is, many particles of the powder are in a fine state on the order of 100 nm or less in the composition. Refers to being present in. Then, the dispersibility of the predetermined amount of the predetermined powder can be measured or evaluated by determining the relationship between the shear rate and the viscosity. More specifically, using a rheometer, the viscosity of a powder dispersion composition in which a predetermined amount of a predetermined powder is dispersed is measured while gradually increasing or decreasing the shear rate, and the change is analyzed. In this embodiment, for example, the value obtained by dividing the difference between the first viscosity at ^{a shear rate of 100 s -1} and the second viscosity at a shear rate of 1000 s ^{-1 by the first viscosity is used as the viscosity attenuation rate.} Based on this, the dispersibility can be evaluated. The smaller the viscosity attenuation rate, the lower the shear-sinning property (the tendency for the viscosity to decrease as the shear rate increases), and the better the dispersibility. It can be said that it is present or easily aggregates.

The powder dispersion composition in the present invention includes an oily composition in which powder is dispersed in the oily component, an emulsified composition in which powder is dispersed in an oil-in-water emulsified emulsion, and powder dispersed in a water-in-oil emulsified emulsion. It can be in any form possible as a composition, such as an emulsified composition.

<(A) Volatile oil>
(A) Volatile oil is an oil that is volatile at 1 atm and 25 ° C. Further, the volatile oil (A) may be an oil having a boiling point of 250 ° C. or lower at 1 atm. Examples of the volatile oil include volatile alkane oil and volatile silicone oil.

The content of the volatile oil (A) is preferably 25% by mass or more and 65% by mass or less, more preferably 30% by mass or more and 60% by mass or less, still more preferably 35% by mass, based on the total amount of the powder dispersion composition. It can be 55% by mass or less, more preferably 40% by mass or more and 50% by mass or less. (A) By setting the content of the volatile oil in the above range, when or after applying the powder dispersion composition, and further when applying or applying cosmetics or the like obtained by using the powder dispersion composition. After that, it can bring a refreshing feel.

In addition, in this specification, terms such as "refreshing sensation" and "refreshing sensation" are used when and / or after the user applies the cosmetic to the body surface with fingers or the like. / Or a non-greasy, refreshing sensation on the skin. It may also include the sensation felt by the user when the skin is touched again with a finger or the like after application.

The content of the volatile oil (A) is preferably 50% by mass or more and 90% by mass or less, more preferably 60% by mass or more and 80% by mass or less, based on the total amount of the dispersion medium in the powder dispersion composition. It may be there. (A) By setting the content of the volatile oil in the above range, the powder-dispersed composition can be given a refreshing feel, and the same applies to cosmetics and the like obtained by using the powder-dispersed composition. Can provide a good tactile sensation.

<(A1) Volatile alkane oil>
The (A) volatile oil may include (A1) volatile alkane oil. (A1) The volatile alkane oil may be an alkane oil having 10 to 15 carbon atoms. Further, the (A1) volatile alkane oil is preferably a branched alkane because it can impart appropriate volatility to the powder dispersion composition and the cosmetics using the powder dispersion composition.

Specific examples of (A1) volatile alkane oil include isododecane, isodecan, isohexadecane, hydrogenated polyisobutene (light isoparaffin) and the like. These (A1) volatile alkane oils can be used alone or in combination of two or more. Further, among the listed (A1) volatile alkane oils, isododecane is preferable because it is superior in a refreshing tactile sensation.

When the (A1) volatile alkane oil contains isododecane, the ratio of the isododecane content to the total amount of the (A1) volatile alkane oil is preferably 50% by mass or more, more preferably 75% by mass or more, still more preferably 90. It may be% by mass. Further, it is more preferable that the (A1) volatile alkane oil is composed of isododecane.

(A1) Value of the ratio of the content of volatile alcan oil to (A) the total content of volatile oil ([(A1) Amount of volatile alcan oil] / [(A) Total amount of volatile oil]) May be 0.5 or more, preferably 0.8 or more, and more preferably 0.9 or more. Further, the value of the ratio of the content of (A1) volatile alcan oil to the total content of (A) volatile oil may be 1, that is, (A) volatile oil is (A1) volatile alcan. It may be oil.

By setting the ratio of the content of (A1) volatile alcan oil to the total content of (A) volatile oil to 0.5 or more, the (D) metal oxide powder contained in the powder dispersion composition Dispersibility can be improved. Further, (B) the ultraviolet absorber can be mixed more uniformly in the oil-based medium, and in particular, (B) the ultraviolet absorber and (A2) volatile silicone oil described later can be mixed better with each other. As a result, it is possible to obtain a powder dispersion composition in which each component is uniformly mixed and dispersed without separating the oil-based media from each other, so that the functions of each component (ultraviolet protection ability and skin hiding ability, that is, covering ability) can be obtained. Etc.) can be exhibited well.

<(A2) Volatile silicone oil>
The (A) volatile oil may contain (A2) volatile silicone oil. Since the powder dispersion composition contains (A2) volatile silicone oil, the tactile sensation when the powder dispersion composition is applied can be made softer and smoother, and further, it can be obtained by using the powder dispersion composition. The tactile sensation when applying cosmetics or the like can be made softer and smoother.

Specific examples of the (A2) volatile silicone oil include chain polysiloxanes such as dimethylpolysiloxane (dimethicone), methylphenylpolysiloxane, and diphenylpolysiloxane, and decamethylcyclopentasiloxane, octamethylcyclotetrasiloxane, and dodecamethyl. Cyclic polysiloxanes such as cyclohexasiloxane can be mentioned. Further, the (A2) volatile silicone oil may be a modified silicone (modified polysiloxane) modified with amino, fluorine, alkyl or the like as long as it does not impair the volatility and does not interfere with the action of improving the tactile sensation. good. These (A2) volatile silicone oils can be used alone or in combination of two or more.

Of the above (A2) volatile silicone oils, it is more preferable to use cyclic polysiloxane or dimethylpolysiloxane because it is superior in a refreshing feel.

(A2) Value of the ratio of the content of volatile silicone oil to (A) the total content of volatile oil ([(A2) Amount of volatile silicone oil] / [(A) Total amount of volatile oil]) Is preferably 0. From the viewpoint that the dispersibility of the (D) metal oxide powder contained in the powder dispersion composition can be improved and (B) the ultraviolet absorber can be mixed more uniformly in the oil-based medium. It can be 5 or less, more preferably 0.2 or less, still more preferably 0.1 or less, still more preferably 0. Further, from the viewpoint of further improving the tactile sensation such as a refreshing feeling, the value of the ratio of the content of (A2) volatile silicone oil to the total content of (A) volatile oil should be 0.1 or more. Can be done.

The content of (A2) volatile silicone oil can improve the dispersibility of (D) metal oxide powder contained in the powder dispersion composition, and (B) the ultraviolet absorber is more uniformly mixed in the oil-based medium. From the viewpoint of being able to do so, it can be preferably 25% by mass or less, more preferably 15% by mass or less, still more preferably 5% by mass or less, still more preferably 0% by mass. Further, from the viewpoint of further improving the tactile sensation such as a refreshing feeling, the content of the (A2) volatile silicone oil can be 5% by mass or more with respect to the total amount of the powder dispersion composition.

The (A2) volatile silicone oil preferably has a viscosity at 25 ° C. of 10 mPa · s or less, and more preferably 5 mPa · s or less, from the viewpoint of improving the tactile sensation.

<(B) UV absorber>

The powder dispersion composition according to this embodiment contains (B) an ultraviolet absorber. (B) The ultraviolet absorber is a polar oil generally used in cosmetics, that is, an oily component having a relatively high polarity. Further, as is clear from the following examples, the (B) ultraviolet absorber may be a solid or a liquid at room temperature (25 ° C.).

(B) The type of the ultraviolet absorber is not particularly limited, but for example, benzoic acid derivative, salicylic acid derivative, silicic acid derivative, dibenzoylmethane derivative, β, β-diphenylacrylate derivative, benzophenone derivative, benzilidenshouno derivative, phenyl Examples thereof include benzoimidazole derivatives, triazine derivatives, phenylbenzotriazole derivatives, anthranyl derivatives, imidazoline derivatives, benzalmalonate derivatives, 4,4-diarylbutadiene derivatives, silicone derivatives and the like. More specific examples are listed below.

Examples of the benzoic acid derivative include p-aminobenzoic acid (PABA) ethyl, ethyl-dihydroxypropyl PABA, ethylhexyl-dimethyl PABA, glyceryl PABA, PEG-25 PABA, diethylaminohydroxybenzoyl hexyl benzoate and the like.

Examples of salicylic acid derivatives include homosalate, ethylhexyl salicylate (octyl salicylate), dipropylene glycol salicylate, and TEA salicylate.

Examples of the cinnamic acid derivative include octylmethoxycinnamate (ethylhexyl methoxycinnamate), isopropyl methoxycinnamate, isoamyl methoxycinnamate, cinoxate, DEA methoxycinnamate, diisopropyl methylsilicate, and glyceryl-ethylhexanoate-. Examples thereof include dimethoxycinnamate and di- (2-ethylhexyl) -4'-methoxybenzalmalonate.

Examples of the dibenzoylmethane derivative include butylmethoxide benzoylmethane (4-tert-butyl-4'-methoxydibenzoylmethane). Examples of β and β-diphenylacrylate derivatives include octocrylene and the like.

Examples of the benzophenone derivative include benzophenone-1, benzophenone-2, benzophenone-3 or oxybenzone, benzophenone-4, benzophenone-5, benzophenone-6, benzophenone-8, benzophenone-9, benzophenone-12 and the like.

Examples of the benzylidene sulphate derivative include 3-benzylidene sulphate, 4-methylbenzylidene sulphonic acid, benzylidene sulphonic acid, sulphonic acid sulphate benzalkonium, terephthalilidene sulphonic acid, polyacrylamide methylbenzylidene sulphonic acid and the like.

Examples of the phenylbenzimidazole derivative include phenylbenzoimidazole sulfonic acid and disodium phenyldibenzoimidazole tetrasulfonate.

Examples of triazine derivatives include anisotriazine (bisethylhexyloxyphenol methoxyphenyl triazine), ethylhexyltriazone, diethihexylbutamidotriazine, and 2,4,6-tris (diisobutyl-4'-aminobenzalmaronate) -s. -Triazine and the like can be mentioned.

Examples of the phenylbenzotriazole derivative include drometrizoletrisiloxane and methylenebis (benzotriazolyltetramethylbutylphenol).

Examples of the anthranil derivative include menthyl anthranilate. Examples of the imidazoline derivative include ethylhexyldimethoxybenzylidene dioxoimidazolidine propionate. Examples of the benzalmalonate derivative include polyorganosiloxane having a benzalmalonate functional group. Examples of the 4,4-diarylbutadiene derivative include 1,1-dicarboxy (2,2'-dimethylpropyl) -4,4-diphenylbutadiene. Examples of the silicone derivative include polysilicone-14 and polysilicone-15.

The above-mentioned (B) ultraviolet absorber may be used alone or in combination of two or more.

(B) The content of the ultraviolet absorber may be preferably 5% by mass or more and 35% by mass or less, more preferably 10% by mass or more and 30% by mass or less, based on the total amount of the powder dispersion composition. (B) By setting the content of the ultraviolet absorber in the above range, the ultraviolet absorbing action of the powder dispersion composition and the cosmetics using the powder dispersion composition can be enhanced, and the powder dispersion composition and the makeup using the powder dispersion composition and the makeup using the same can be enhanced. It is possible to maintain a good dispersion state of the powder in the material and the like.

Further, the value of the ratio of the content of (A) volatile oil to the content of (B) ultraviolet absorber ([(A) amount of volatile oil] / [(B) amount of ultraviolet absorber]) is It may be preferably 1 or more and 5 or less, more preferably 1.5 or more and 4 or less, and further preferably 2 or more and 3 or less. By setting the value of the ratio of the content of (A) volatile oil to the content of (B) ultraviolet absorber in the above range, (B) the ultraviolet absorber and other oil-based medium are well compatible with each other. Since it is possible to prevent or suppress the stickiness derived from the ultraviolet absorber, the ultraviolet absorbing function of (B) the ultraviolet absorber in the powder dispersion composition and the cosmetics using the powder dispersion composition is improved, and further, the stickiness is further improved. You can get a refreshing feel without any UV rays.

<(C) Polyglycerin-modified silicone>
(C) The polyglycerin-modified silicone can function as a dispersant in this embodiment. (C) Polyglycerin-modified silicone is a polymer compound having both a glycerin chain portion and a silicone chain portion. Since the glycerin chain portion can be satisfactorily adsorbed on the powder, particularly the (D) metal oxide powder described later, and the silicone chain portion can be satisfactorily dissolved in the oily component, (C) polyglycerin-modified silicone. By using (D), the metal oxide powder can be satisfactorily dispersed in the oily component and further in the powder dispersion composition.

(C) The polyglycerin-modified silicone may be a compound in which a polyglycerin side chain is introduced into a silicone main chain, or may be a block copolymer of a silicone chain and a polyglycerin chain (polyether group). .. The (C) polyglycerin-modified silicone used in this embodiment is particularly preferably glycerin or polyglycerin having both ends modified with silicone (sometimes referred to as double-ended silicone-modified glycerin or both-ended silicone-modified polyglycerin). ..

The (C) polyglycerin-modified silicone may be both-terminal silicone-modified glycerin represented by the following structural formula (1), preferably structural formula (2).

In the above formula, R1 is a linear or branched alkyl group having 1 to 12 carbon atoms or a phenyl group, R2 is an alkyl group having 2 to 11 carbon atoms, m is 10 to 120, and n is 1 to 11. be.

In the formula, R1 is a linear or branched alkyl group having 1 to 12 carbon atoms, or a phenyl group, m is 10 to 120, and n is 1 to 11.

(C) The hydrophilic lipophilic balance (HLB) of the polyglycerin-modified silicone is preferably 0.2 to 3.0. The HLB value may be calculated by Griffin's formula (HLB value = molecular weight of glycerin portion × 20 / total molecular weight). The molecular weight of (C) polyglycerin-modified silicone is preferably 2000 to 20000.

Specific examples of the (C) polyglycerin-modified silicone include polyglyceryl-3 disiloxane dimethicone, polyglyceryl-3 polydimethylsiloxyethyl dimethicone, lauryl polyglyceryl-3 polydimethylsiloxyethyl dimethicone, bis-butyl dimethicone polyglyceryl-3, (dimethicone /). Examples thereof include polyglycerin-3) crosspolymer, (lauryldimethicone / polyglycerin-3) crosspolymer, and (polyglyceryl-3 / laurylpolydimethylsiloxyethyldimethicone) crosspolymer. These (C) polyglycerin-modified silicones can be used alone or in combination of two or more.

(C) Commercially available products of polyglycerin-modified silicone include KF-6100, KF-6104, KF-6105, KF-6106, KF-6109, KSG-710, KSG-810, and KSG-820 manufactured by Shin-Etsu Chemical Co., Ltd. , KSG-830, KSG-840, KSG-820Z, KSG-850Z and the like.

As the (C) polyglycerin-modified silicone used in this embodiment, a non-crosslinked polyglycerin-modified silicone that does not constitute a cross polymer is preferable, and polyglyceryl-3 disiloxane dimethicone, polyglyceryl-3 polydimethylsiloxyethyl dimethicone, and lauryl polyglyceryl- 3 It is more preferable that it is one or more of polydimethylsiloxyethyl dimethicone and bisbutyldimethicone polyglyceryl-3. Further, it is preferable to use bisbutyldimethicone polyglyceryl-3 because the function of dispersing the metal oxide powder (D) in the oily component is particularly high.

The content of the polyglycerin-modified silicone (C) is preferably 0.01% by mass or more and 5% by mass or less, more preferably 0.05% by mass or more and 4% by mass or less, still more preferably, based on the total amount of the powder dispersion composition. May be 0.1% by mass or more and 3% by mass or less. By setting the content of (C) polyglycerin-modified silicone in the above range, the dispersibility of (D) metal oxide powder can be enhanced, and a refreshing feel without stickiness can be obtained when used in cosmetics. can.

<(D) Metal oxide powder>
The metal oxide powder (D) in the present embodiment may be a powder having an ultraviolet scattering function, that is, an ultraviolet scattering agent or a pigment. The UV scatterer can have an average particle size of primary particles of 100 nm or less. Further, the pigment may have an average particle size of primary particles in the range of 100 nm to 500 nm.

Specific examples of the metal oxide powder (D) include titanium oxide, zinc oxide, tin oxide, cerium oxide, talc, silica, mica, sericite, kaolin, mica titanium, black iron oxide, yellow iron oxide, red iron oxide, and ultramarine. , Navy blue, chromium oxide, chromium hydroxide and the like. Further, the metal oxide powder (D) may be a powder composed of particles other than titanium oxide coated with titanium oxide. These (D) metal oxide powders can be used alone or in combination of two or more.

Among the above specific examples, one or more of fine particle titanium oxide and fine particle zinc oxide is preferable, and the concealing property as a pigment is high because the ultraviolet ray protection function as an ultraviolet ray scattering agent is high and the handling is easy. Therefore, one or more of pigment grade titanium oxide, black iron oxide, yellow iron oxide, and red iron oxide is preferable.

The particle surface of the (D) metal oxide powder may be hydrophobized. As a result, the metal oxide powder (D) can be satisfactorily dispersed by the oily component. (D) Hydrophobization of the metal oxide powder can be obtained by introducing a hydrophobic group onto the particle surface of the powder or by a hydrophobizing treatment for forming a coating of a hydrophobic substance. The hydrophobic treatment may be a wet method using a solvent, a vapor phase method, a mechanochemical method or the like. Further, as a treatment agent in the hydrophobizing treatment, silicones such as methylhydrogenpolysiloxane and dimethylpolysiloxane, silane coupling agents such as triethoxycaprylylsilane, hydrocarbons such as squalane and paraffin, dextrin fatty acid ester, higher fatty acid, etc. Examples thereof include higher alcohols, fatty acid esters, metal soaps, alkyl phosphate ethers, fluorine compounds, and the like.

The content of the metal oxide powder (D) is preferably 15% by mass or more and 60% by mass or less, more preferably 20% by mass or more and 50% by mass or less, still more preferably 25% by mass, based on the total amount of the powder dispersion composition. It may be 40% by mass or less. By setting the content of the metal oxide powder (D) within the above range, it is possible to improve the ultraviolet protection function of the powder dispersion composition and cosmetics using the powder dispersion composition, and to improve the covering power. , (D) The dispersibility of the metal oxide powder can be maintained well.

<Other oily ingredients>
The powder dispersion composition according to this embodiment may contain an oily component other than the above-mentioned (A) volatile oil and (B) ultraviolet absorber.

For example, the powder dispersion composition may contain an oil that is not a volatile oil (nonvolatile oil, excluding the ultraviolet absorber in the present specification). For example, the powder dispersion composition may contain a non-volatile alkane oil (nonvolatile alkane oil). The non-volatile alkane oil may be a linear or branched hydrocarbon oil, and specific examples thereof include liquid paraffin, ozokerite, squalane, pristane, paraffin, selecin, squalene, petrolatum, microcrystalline wax and the like. Further, the powder dispersion composition may contain a non-volatile silicone oil (nonvolatile silicone oil) such as high molecular weight polymethylsiloxane.

When the powder dispersion composition contains a non-volatile oil (excluding an ultraviolet absorber), the content of the non-volatile oil is 10% by mass or less, preferably 5% by mass or less, based on the total amount of the powder dispersion composition. More preferably, it may be 3% by mass or less. Further, more preferably, it contains substantially no or no non-volatile oil.

Further, the powder dispersion composition according to this embodiment may contain a polar oil other than the ultraviolet absorber, for example, an ester oil. The ester oil may be a monoester, a diester, a carbonic acid ester or the like, and may be an aliphatic ester or an aromatic ester. Further, the powder dispersion composition according to this embodiment may contain higher fatty acids, higher alcohols, liquid fats and oils, solid fats and oils, waxes, fragrances and the like as oily components.

<Emulsification composition>
An emulsified composition can be obtained by using the above-mentioned powder dispersion composition and an aqueous component or the like. The emulsified composition may be a water-in-oil type composition or an oil-in-water type composition.

The aqueous component is not particularly limited as long as it is an aqueous component usually used in external compositions such as cosmetics and quasi-drugs. As the aqueous component, water, a water-soluble alcohol, a thickener, a moisturizer, a chelating agent, a preservative, a pigment and the like can be used.

As water, purified water, ion-exchanged water, tap water, etc. can be used. Examples of the water-soluble alcohol include lower alcohols, polyhydric alcohols, polyhydric alcohol polymers, alcohol alkyl ethers, alcohol ether esters, glycerin monoalkyl ethers, sugar alcohols, monosaccharides, oligosaccharides, polysaccharides and derivatives thereof. Can be mentioned.

In addition, when preparing an emulsified composition, surfactants such as oil gelling agents and emulsifiers, powders other than (D) metal oxide powder, antioxidants, preservatives, anti-inflammatory agents, whitening agents, and plant extracts Substances, activators, blood circulation promoters, antilipolytic agents and the like can be further added. In addition, the other oily components described above can also be added during the preparation of the emulsified composition. These components can be added in an amount that does not impair the stability, UV protection, and covering power of the emulsified composition.

<Cosmetics>
The composition obtained by this embodiment (the above-mentioned powder dispersion composition and an emulsified composition using the same) may be a sunscreen for the body or face (sunscreen), or may have a sunscreen action (ultraviolet rays). It may be a cosmetic or personal care product having a high shielding action). Cosmetics include, for example, basic cosmetics such as foundations and base makeups, makeup cosmetics, and the like, and personal care products include hand creams, body creams, and the like.

As described above, according to this embodiment, a powder dispersion composition containing an ultraviolet absorber and in which the powder is well dispersed can be obtained. Therefore, by using this powder dispersion composition, while containing the ultraviolet absorber. , An emulsified composition in which the powder is well dispersed can be obtained. Therefore, the ultraviolet absorber and the metal oxide powder, particularly the fine powder having the ultraviolet scattering function, are uniformly dispersed and present, so that a high ultraviolet protection function can be exhibited. Therefore, when compared with a composition containing the same amount of an ultraviolet absorber and an ultraviolet scattering agent, a higher ultraviolet protection effect is exhibited.

The components shown in Table 1 were mixed by a conventional method to prepare and evaluate the powder dispersion compositions of Examples and Comparative Examples. The results are shown in Table 1. The composition was evaluated by the following method.

<Evaluation of powder dispersibility>
The viscosity attenuation rate was used to evaluate the dispersibility of the powder. More specifically, using a rheometer (MCR302 manufactured by Anton Pearl Co., Ltd.), the viscosity was measured at 25 ° C. while gradually increasing the shear rate applied to the obtained powder dispersion composition. Then, the viscosity η (100s ^-1 ) when the shear rate was 100s ^-1 and the viscosity η (1000s ^-1 ) when the shear rate was 1000s ^-1 were recorded, and the viscosity attenuation rate was calculated from the following formula.

Viscosity decay rate = {η (100s ^-1 ) -η (1000s ^-1 )} / η (100s ^-1 )

It can be evaluated that the smaller the viscosity attenuation rate, the smaller the degree of change in viscosity due to the increase in shear rate, and the higher the dispersibility of the powder.

<Evaluation of formulation in emulsified cosmetics and feel of use>
Of the obtained powder dispersion compositions, the composition having good dispersibility (viscosity attenuation rate was 0.2 or less) was further used with other components such as an aqueous component, and an emulsified cosmetic was prepared according to Table 2. Prepared. In the preparation of emulsified cosmetics, all components except water-soluble components (purified water, ethanol, and dipropylene glycol) are mixed, and then a mixture of water-soluble components is added to the mixture while stirring with a homogenizer. A water-in-oil emulsified composition was obtained.

The usability of the obtained emulsified cosmetics was evaluated by an actual use test of a panel of 10 people. The "fresh feeling" when each emulsified cosmetic was applied to the skin was judged according to the following criteria.

A: 8 or more out of 10 responded that they were good.

B: 4 to 7 out of 10 responded that they were good.

C: 3 out of 10 responded that it was good.

In Table 1,
* 1: "MZY-510M3S" manufactured by TAYCA
Dimethicone / Hydrogen Dimethicone-treated Zinc Oxide * 2: "FINEX-51W-LP3" manufactured by Sakai Chemical Industry Co., Ltd.
Dimethicone / Hydrous Silica Treated Zinc Oxide * 3: "MT-014V" manufactured by TAYCA Corporation
Stearic acid / aluminum hydroxide treated titanium oxide * 4: "ST-485SA" manufactured by Titan Kogyo Co., Ltd.
Stearic acid / Al hydroxide treated titanium oxide * 5: "OTQ-MT100Si" manufactured by TAYCA Corporation
Alkoxysilane / distearyldimethylammonium chloride / hydrous silica-treated titanium oxide * 6: "Typake CR-50" manufactured by Ishihara Sangyo Co., Ltd.
Aluminum hydroxide treated titanium oxide * 7: "Silicone KF6038" manufactured by Shin-Etsu Chemical Co., Ltd.
Lauryl PEG-9 polydimethylsiloxyethyl dimethicone

　表１、２における各成分の配合量の単位は、質量％である。

The unit of the blending amount of each component in Tables 1 and 2 is mass%.

From Table 1, Examples 1 to 9 in which the value of the ratio of the content of the volatile alcan oil to the content of the total volatile oil is relatively large has a low viscosity attenuation rate, a high powder dispersibility, and a refreshing feeling. It was found that excellent cosmetics can be obtained.

On the other hand, the dispersibility of Comparative Examples 1 and 2 in which the value of the ratio of the content of the volatile alkane oil to the content of the total volatile oil was smaller than that of Examples 1 to 8 was lower than that of Examples 1 to 9. Further, the dispersibility of Comparative Example 3 in which the value of the ratio of the total volatile oil content to the content of the ultraviolet absorber was smaller than that of Examples 1 to 9 was also lower than that of Examples 1 to 9. Further, a comparative example in which the ratio of the content of the volatile alkane oil to the content of the total volatile oil is the same as in Examples 2 to 9 but does not contain bisbutyldimethicone polyglyceryl-3 (polyglycerin-modified silicone). The dispersibility of 4 and 5 was lower than that of Examples 1 to 8.

In Examples 1 to 9 using bisbutyldimethicone polyglyceryl-3, the refreshing feeling when blended into the cosmetic was good. On the other hand, in Comparative Examples 6 and 7, which did not contain bisbutyldimethicone polyglyceryl-3 and used polyhydroxystearic acid and polyoxyalkylene-alkyl co-modified organopolysiloxane as dispersants, the viscosity attenuation rate was from Example 1 to Example 1. Although it was as low as that of No. 9, it was found that the refreshing feeling when blended in the cosmetics was inferior to that of Examples 1 to 9.

This application claims priority based on Japanese Patent Application No. 2020-014543 filed with the Japan Patent Office on January 31, 2020, the entire contents of which are incorporated herein by reference.

Claims (8)

(A) Volatile oil,
In a medium containing (B) UV absorber and (C) polyglycerin-modified silicone,
(D) The metal oxide powder is dispersed,
The (A) volatile oil contains (A1) volatile alcan oil, and the ratio of the content of the (A1) volatile alcan oil to the content of the (A) volatile oil is 0.5 or more. Is a powder dispersion composition. The powder dispersion composition according to claim 1, wherein the (A) volatile oil further contains (A2) a volatile silicone oil. The powder dispersion composition according to claim 1 or 2, wherein the (A1) volatile alkane oil contains one or more selected from isododecane, isodecan, isohexadecane, and hydrogenated polyisobutene. The powder dispersion composition according to any one of claims 1 to 3, wherein the value of the ratio of the content of the (A) volatile oil to the content of the (B) ultraviolet absorber is 1 or more and 3 or less. thing. The powder dispersion composition according to any one of claims 1 to 4, wherein the (C) polyglycerin-modified silicone is both-terminal siliconeized glycerin. The powder dispersion composition according to any one of claims 1 to 5, wherein the content of the metal oxide powder (D) is 5% by mass or more and 50% by mass or less with respect to the total amount of the powder dispersion composition. thing. An emulsified composition containing the powder dispersion composition according to any one of claims 1 to 6. A cosmetic comprising the powder dispersion composition according to any one of claims 1 to 6 or the emulsified composition according to claim 7.