JP2019094312A - Sunscreen cosmetic - Google Patents

Abstract

To provide an oil-in-water type sunscreen cosmetic having excellent sense of use such as a non-sticky feeling or skin compatibility and emulsion stability while having a good ultraviolet shielding function.SOLUTION: There is provided an oil-in-water type sunscreen cosmetic comprising the following components (A) to (D): (A) a (sodium acrylate/acryloyldimethyl taurate)copolymer, (B) a polyglycerol fatty acid ester obtained by ester bonding one mole of polyglycerin having a polymerization degree of 10 and 2 to 5 moles of a fatty acid having 16 or more carbon atoms, (C) an ionic surfactant and (D) an ultraviolet scattering agent and/or an ultraviolet absorber.SELECTED DRAWING: None

Description

  The present invention relates to a sunscreen cosmetic comprising a water soluble copolymer.

  The oil-in-water emulsion type sunscreen cosmetic has a refreshing feeling of use and is easy to use continuously. In order to enhance the UV protection effect, UV absorbers and UV scattering agents, which are metal oxide powders such as zinc oxide and titanium oxide, are used in the oil-in-water emulsion cosmetic. However, when a large amount of ultraviolet light absorber is blended, there is a problem that discoloration occurs, spreading is poor, and the feeling of use such as stickiness worsens. In addition, when a large amount of metal oxide powder is blended, not only aggregation and sedimentation of the powder occur over time, but also there is a problem that the temporal stability such as viscosity decrease, emulsion separation, and precipitation decreases. The above problems tend to occur more easily if these are used in combination.

In order to improve these problems, it has been proposed to use an ultraviolet absorber such as a dibenzoylmethane derivative in combination with titanium oxide treated with a silane and / or a silicone (see Patent Document 1).
In addition, oil-in-water emulsion cosmetic preparations (see Patent Documents 2 and 3) using water-soluble polymers such as polyacrylamide, xanthan gum, (sodium acrylate / acryloyldimethyltaurine) copolymer and the like have been proposed.

Unexamined-Japanese-Patent No. 9-2929 gazette Japanese Patent Application Publication No. 2003-104859 JP, 2010-215602, A

As described above, in the field of oil-in-water sunscreen cosmetic technology, it has been an object to make the UV protection function compatible with the feeling in use and the emulsion stability. Conventionally, although various techniques have been proposed to solve this problem, they have been insufficient. In view of such circumstances, the problem to be solved by the present invention is an oil-in-water type having excellent stability against emulsification and having excellent feeling of use such as no stickiness and familiarity while having a good ultraviolet protection function. To provide sunscreen cosmetics.

The present invention for solving the above-mentioned problems is an oil-in-water sunscreen cosmetic comprising components (A) to (D).
(A) (sodium acrylate / acryloyldimethyltaurine) copolymer (B) Polyglycerin fatty acid ester (C) formed by ester bonding of one polyglycerin having a polymerization degree of 10 and 2 to 5 molecules of a fatty acid of C16 or more Surfactant (D) UV scattering agent and / or UV absorber

The sunscreen cosmetic of the present invention has an ultraviolet protective function, but has a less sticky feeling and is excellent in moisture retention. In addition, the sunscreen cosmetic of the present invention is emulsion stable.

In a preferred embodiment of the present invention, the component (C) is anionic surfactant.
By using an anionic surfactant as the ionic surfactant, the emulsion stability can be further improved. Moreover, the sunscreen cosmetics of this invention which used anionic surfactant are excellent also in the usability.

In a preferred form of the invention said anionic surfactant is sodium acyl lactate.
Emulsification stability can be further improved by using sodium acyl lactate as an anionic surfactant. In addition, the sunscreen cosmetic of the present invention using sodium acyl lactate is excellent in the feeling in use.

In a preferred form of the invention said component (B) is polyglyceryl pentastearate.
The sunscreen cosmetic of the present invention containing polyglyceryl pentastearate is excellent in emulsion stability and feeling in use.

In a preferred embodiment of the present invention, the component (D) is a water dispersible ultraviolet light scattering agent. Since the water-dispersible UV scattering agent disperses uniformly in the water phase, such a sunscreen cosmetic has excellent UV protection function.

In a preferred embodiment of the present invention, the water-dispersible UV scattering agent is a UV scattering agent which is surface-treated with sodium polyacrylate.
In such a sunscreen cosmetic, the ultraviolet light scattering agent is more uniformly dispersed, and is excellent in the ultraviolet light protection function.

  According to the present invention, it is possible to provide an oil-in-water type sunscreen cosmetic which is excellent in emulsifying stability and excellent in feeling of use such as no stickiness and familiarity of skin while having a good ultraviolet light protection function. .

  The feature of the sunscreen cosmetic of the present invention is to contain the four components (1) to (4) as essential components. Hereinafter, the components of (1) to (4) will be described in detail.

<1> Component (A) ... (sodium acrylate / acryloyldimethyltaurine) copolymer (sodium acrylate / acryloyldimethyltaurine) copolymer is described in the International Cosmetic Ingredient Dictionary as "SODIUM ACRYLATE / ACRYLOYLDIMETHYL TAURATE COPOLYMER", It is a copolymer of sodium acrylate and sodium acryloyldimethyl taurine. Commercial products containing the polymer include SIMULGEL EG (manufactured by SEPPIC) containing 37.5% by mass of (sodium acrylate / acryloyldimethyltaurine) copolymer and containing isohexadecane, polysorbate 80 and water as other components. , Which can be suitably used.

  The content of the above-mentioned (sodium acrylate / acryloyldimethyl taurine) copolymer is not particularly limited, but is preferably 0.001 to 15% by mass, and the lower limit is preferably 0.01% by mass or more. Preferably, it is 0.1% by mass or more. The upper limit is more preferably 5% by mass or less, and still more preferably 2% by mass or less.

<2> Component (B) ... polyglycerin fatty acid ester The sunscreen cosmetic of the present invention is a polyglycerin formed by ester bonding of one polyglycerin having a polymerization degree of 10 and two to five fatty acids of C16 or more. It is characterized in that a fatty acid ester is contained as the component (B).

The C16 or higher fatty acid constituting the polyglycerin fatty acid ester of the component (B) may have a branched chain, and may be saturated or unsaturated.
Oleic acid and stearic acid can be preferably exemplified.
In addition, the number of molecules of the fatty acid to be ester bonded to one polyglycerin molecule may be 2 to 5, and preferably 5 molecules.

  In the present invention, polyglyceryl pentastearate is particularly preferably used as component (B).

The content of the polyglycerin fatty acid ester of the component (B) can be usually 0.1 to 10% by mass.
In addition, from the viewpoint of improving the emulsion stability, the content of the component (B) is 0.3% by mass or more, more preferably 0.5% by mass, and still more preferably 0.7% by mass or more.
Furthermore, from the viewpoint of the emulsion stability and suppression of stickiness, the content of the component (B) is preferably 7% by mass or less, more preferably 5% by mass or less, and further preferably 3% by mass or less.

<3> Component (C) ... ionic surfactant The sunscreen cosmetic of the present invention contains an ionic surfactant as component (C). The ionic surfactant is not particularly limited as long as it is used in cosmetics, and any of an anionic surfactant, a cationic surfactant and an amphoteric surfactant can be used.

  Examples of the anionic surfactant include fatty acid sodium, fatty acid potassium, fatty acid soap such as fatty acid triethanolamine, sodium lauryl sulfate which may have polyoxyethylene group, potassium lauryl sulfate, triethanolamine lauryl sulfate And alkyl sulfate ester salts, acyl lactate salts, and optionally having polyoxyethylene group, sodium lauryl phosphate, potassium lauryl phosphate, alkyl phosphate ester salts such as triethanolamine lauryl phosphate, sulfosuccinic acid Alkyl ester salt etc. can be illustrated preferably.

  As a cationic surfactant, for example, alkyl trimethyl ammonium salt, alkyl pyridinium salt, distearyl dimethyl ammonium chloride, dialkyl dimethyl ammonium salt, poly (N, N'-dimethyl-3,5-methylene piperidinium) chloride, Alkyl quaternary ammonium salt, alkyl dimethyl benzyl ammonium salt, alkyl isoquinolinium salt, dialkyl morpholinium salt, POE-alkyl amine, alkyl amine salt, polyamine fatty acid derivative, amyl alcohol fatty acid derivative, benzalkonium chloride, benzethonium chloride Etc. can be preferably exemplified.

  As the amphoteric surfactant, examples of the amphoteric surfactant include imidazoline based amphoteric surfactants, betaine based surfactants and the like.

  Among the above-mentioned surfactants, it is preferable to use an anionic surfactant as the component (C), and it is more preferable to use an acyl lactate.

  As the acyl lactate, a sodium salt is preferable, and specifically, sodium lauroyl lactate, sodium isostearoyl lactate, sodium stearoyl lactate, sodium acyl lactate and the like can be preferably exemplified.

The content of ionic surfactant is
From the viewpoint of improving the emulsion stability, the lower limit is preferably 0.01% by mass, more preferably 0.05% by mass, and still more preferably 0.1% by mass.
Furthermore, from the viewpoint of suppression of stickiness, the upper limit is preferably 1.5% by mass, more preferably 1% by mass, and still more preferably 0.5% by mass.

<4> Component (D) ... UV scattering agent / UV absorber The sunscreen cosmetic of the present invention contains a UV scattering agent and / or a UV absorber as the component (D).

  The ultraviolet light scattering agent refers to a particulate metal oxide having a function of scattering ultraviolet light, and the type thereof is not particularly limited as long as it can be blended in an emulsion type cosmetic. Examples of metal oxides include titanium dioxide, zinc oxide, zirconium oxide and cerium oxide.

  The content of the ultraviolet light scattering agent is not particularly limited, and is usually 0.01 to 20% by mass, more preferably 0.1 to 15% by mass, and still more preferably 1 to 10% by mass.

The ultraviolet light scattering agent has a particle diameter referred to as fine particles in the art, and for example, the primary particle diameter by electron microscopic observation is usually 5 nm or more, preferably 10 nm or more, and usually 100 nm or less, preferably 80 nm or less belongs to.
The ultraviolet light scattering agent used in the present invention preferably contains at least one selected from the group consisting of fine particle titanium dioxide and fine particle zinc oxide, because the ultraviolet light scattering agent is excellent in the ultraviolet light scattering effect.

  The UV scattering agent used in the present invention can be prepared by a conventional method such as thermal decomposition of the salt of the corresponding metal in the gas phase, but many commercial products are also present. It can also be done.

  In the present invention, the surface of the ultraviolet light scattering agent is preferably coated with an inorganic compound such as silica or alumina, or an organic compound such as sodium polyacrylate, fatty acid metal soap, or silicone.

  The ultraviolet light scattering agent is preferably water dispersible. The water-dispersible UV scattering agent used in the present invention is one in which the dispersed state in water is stably maintained by surface treatment to a UV scattering agent, a surfactant and the like. Since the water-dispersible ultraviolet light scattering agent uniformly disperses in the aqueous phase, the sunscreen cosmetic of the present invention of such a form is excellent in the ultraviolet light protection function.

As a water-dispersible UV scattering agent, a UV scattering agent whose surface is coated with a hydrophilic compound can be preferably exemplified.
As such a water-dispersible UV scattering agent, a UV scattering agent surface-treated with sodium polyacrylate is preferred, and it can be obtained by the method described in Japanese Patent No. 532816.
The sunscreen cosmetic of the present invention containing an ultraviolet light scattering agent surface-treated with sodium polyacrylate as the component (D) is excellent in dispersibility and excellent in ultraviolet light protection function.

The UV absorber is not particularly limited as long as it is a UV absorber which can usually be added to an emulsion type cosmetic, but in order to absorb UV rays of a wide wavelength, UV rays which absorb UV rays of 320 to 400 nm wavelength (A range) It is preferable to contain -A absorber and UV-B absorber which absorbs the ultraviolet-ray of 290-320 nm wavelength (B area | region).
The content of the ultraviolet absorber is not particularly limited, and is usually 0.01% by mass or more, preferably 0.1% by mass or more, more preferably 1% by mass or more, and usually 20% by mass or less, preferably 15 It is not more than mass%, more preferably not more than 10 mass%.

  As a UV-A absorber, 2-hydroxy-4-methoxybenzophenone, 2- (2'-hydroxy-5'-methylphenyl) benzotriazole, dimethoxybenzylidene dioxoimidazolidine 2-ethylhexyl propionate, bis (reslucinyl) Examples thereof include compounds such as triazine, methylenebisbenzotriazolyltetramethylbutylphenol, hexyl diethylaminohydroxybenzoylbenzoate, t-butylmethoxydibenzoylmethane and the like. Among these, diethylaminohydroxybenzoyl hexylbenzoate and t-butylmethoxydibenzoylmethane are particularly preferable because of their excellent ultraviolet absorbing ability.

  The content of the UV-A absorber is usually 0.01% by mass or more, preferably 0.1% by mass or more, and usually 5% by mass or less, preferably 3% by mass or less.

  Specifically as the UV-B absorber, 2-ethylhexyl paramethoxycinnamate, 2-ethylhexyl 2-cyano-3,3-diphenylacrylic acid, dimethic acid diethyl benzalmalonate, 2,4,6-trianilino Examples thereof include compounds such as p- (carbo-2'-ethylhexyl-1'-oxy) -1,3,5-triazine, 2-hydroxy-4-methoxybenzophenone, homomenthyl salicylate and octyl salicylate. Since commercial products exist for these compounds, commercial products can be used as they are.

  The content of the UV-B absorber is usually 0.1% by mass or more, preferably 0.5% by mass or more, and usually 10% by mass or less, preferably 7% by mass or less.

<5> Other composition The component contained in an oil phase and a water phase is not specifically limited.
As an oil agent which constitutes an oil phase, liquid oil and fat, solid oil and fat, wax, hydrocarbon oil, higher fatty acid, higher alcohol, synthetic ester oil, silicone oil etc. can be mentioned, for example.

  Examples of liquid oils and fats include avocado oil, camellia oil, turtle oil, macadamia nut oil, corn oil, mink oil, olive oil, rapeseed oil, egg yolk oil, sesame oil, persic oil, wheat germ oil, sasanqua oil, castor oil, linseed oil , Safflower oil, cottonseed oil, eno oil, meadowfoam oil, soybean oil, peanut oil, tea seed oil, kaya oil, rice bran oil, Japanese oak oil, Japanese prickly oil, jojoba oil, germ oil, triglycerin, glycerin trioctanoate, Glycerin triisopalmitate etc. are mentioned.

  As solid fats and oils, cacao butter, coconut oil, horse fat, hydrogenated coconut oil, palm oil, beef tallow, goat fat, hydrogenated beef tallow, palm kernel oil, pork fat, beef bone fat, mokurou kernel oil, hydrogenated oil, beef leg fat , Mokuro, hardened castor oil and the like.

  Waxes include beeswax, candelilla wax, cotton wax, carnauba wax, bayberry wax, ivory wax, persimmon wax, montan wax, nuka wax, lanolin, kapok wax, liquid lanolin acetate, liquid lanolin, sugar cane wax, lanolin fatty acid isopropyl, hexyl laurate, reduced lanolin, jojojo Barrow, hard lanolin, shellac wax, POE lanolin alcohol ether, POE lanolin alcohol acetate, POE cholesterol ether, lanolin fatty acid polyethylene glycol, POE hydrogenated lanolin alcohol ether, etc. may be mentioned.

  Examples of hydrocarbon oil include liquid paraffin, ozokerite, pristane, paraffin, ceresin, squalene, petrolatum, microcrystalline wax and the like.

  Examples of higher fatty acids include lauric acid, myristic acid, palmitic acid, stearic acid, behen (behenin) acid, 12-hydroxystearic acid, undecylenic acid, tall acid and the like.

  Examples of higher alcohols include cetyl alcohol, stearyl alcohol, behenyl alcohol, vatyl alcohol, myristyl alcohol, cetostearyl alcohol and the like.

  As synthetic ester oils, isopropyl myristate, cetyl octanoate, octyldodecyl myristate, isopropyl palmitate, butyl stearate, hexyl laurate, myristyl myristate, decyl oleate, decyl dimethyl octanoate, cetyl lactate, myristyl lactate Lanolin acetate, isocetyl stearate, isocetyl isostearate, sucrose stearate, sucrose oleate, cholesteryl 12-hydroxystearate, ethylene glycol di-2-ethylhexylate, dipentaerythritol fatty acid ester, N-alkyl glycol monoisostearate, Neopentyl glycol dicaprate, diisostearyl malate, glycerin di-2-heptylundecanoate, tri-2-ethyl Trimethylolpropane xylylate, trimethylolpropane triisostearate, pentaneerythritol tetra-2-ethylhexylate, glycerin tri-2-ethylhexylate, trimethylolpropane triisostearate, cetyl 2-ethylhexanoate, 2-ethylhexyl palmitate Glycerin trimyristate, Tri-2-heptylundecanoic acid glyceride, Castor oil fatty acid methyl ester, oleic acid oil, cetostearyl alcohol, acetoglyceride, 2-heptylundecyl palmitate, cetyl palmitate, diisobutyl adipate, N- Lauroyl-L-glutamic acid-2-octyldodecyl ester, di-2-heptylundecyl adipate, ethyl laurate, di-2-ethyl sebacate Hexyl myristate 2-hexyl decyl palmitate, 2-hexyldecyl, 2-hexyldecyl adipate, sebacic acid diisopropyl, 2-ethylhexyl succinate, ethyl acetate, butyl acetate, amyl acetate, and triethyl citrate.

  Examples of silicone oils include linear polysiloxanes such as dimethylpolysiloxane, methylphenylpolysiloxane and methylhydrogenpolysiloxane, and cyclic polysiloxanes such as decamethylpolysiloxane, dodecamethylpolysiloxane and tetramethyltetrahydrogenpolysiloxane. Can be mentioned.

  The oil may be used alone or in combination of two or more.

  In the sunscreen cosmetic of the present invention, optional additive components that are usually blended in the cosmetic may be blended, as long as the effects of the present invention are not impaired. Examples of such additional components include humectants such as polyethylene glycol, glycerin, 1,3-butylene glycol, erythritol, sorbitol, xylitol, maltitol, etc .; lower alcohols such as ethanol; butyl hydroxytoluene, tocopherol, phytin etc. Antioxidants; Antibacterial agents such as benzoic acid, salicylic acid, sorbic acid, parahydroxybenzoic acid alkyl esters, hexachlorophene, etc .; acylsulcosic acid (eg sodium lauroyl sarcosine), glutathione, citric acid, malic acid, tartaric acid, organic acids such as lactic acid Vitamin A and its derivatives, vitamin B 6 hydrochloride, vitamin B 6 tripalmitate, vitamin B 6 dioctanoate, vitamin B 2 and its derivatives, vitamin B 12, vitamin B 15 and its derivatives Vitamin B, α-tocopherol, β-tocopherol, γ-tocopherol, vitamin E such as vitamin E acetate, vitamin D, vitamin H, pantothenic acid, pantethine, nicotinic acid amide, benzyl nicotinate and other vitamins; γ-oryzanol, allantoin, glycyrrhizinic acid (salt), glycyrrhetinic acid and derivatives thereof, tranexamic acid and derivatives thereof [as tranexamic acid derivatives, dimers of tranexamic acid (eg, trans-4- (trans-aminomethylcyclohexane hydrochloride) (Carbonyl) aminomethyl cyclohexane carboxylic acid, etc.), ester form of tranexamic acid and hydroquinone (eg, trans-4-aminomethyl cyclohexane carboxylic acid 4'-hydroxyphenyl ester, etc.), tranexam Esters of acid and gentisic acid (eg, 2- (trans-4-aminomethylcyclohexylcarbonyloxy) -5-hydroxybenzoic acid and salts thereof, etc.), amides of tranexamic acid (eg, trans-4-aminomethyl Ciclohexane carboxylic acid methylamide and salts thereof, trans-4- (P-methoxyvinzoyl) aminomethylcyclohexanecarboxylic acid and salts thereof, trans-4-guanidinomethylcyclohexanecarboxylic acid and salts thereof, etc.), hinokitiol, bisabolol, Saponins such as Eucalptone, Thymol, Inositol, Saikosaponin, Carrot Saponin, Hetima Saponin, Muclodisaponin, Pantothenyl Ethyl Ether, Ethynyl Estradiol, Tranexamic Acid, Arbutin, Cephala Various agents such as chinensis, placenta extract, etc .; Ginseng, Clara, kohone, orange, sage, yarrow, zinnia oyster, semen, thyme, tow, spruce, birch, sugina, heimima, marunien, yukinoshita, arnica, lily, yomogi, peony, aloe , Extracts of plants such as gardenia and sawara; pigments; porous and / or water-absorbing powders (for example, starches obtained from corn, potato etc., silicic acid anhydride, talc, kaolin, magnesium aluminum silicate, calcium alginate Etc.); neutralizing agents; preservatives;

The sunscreen cosmetic of the present invention can be produced, for example, by the following method.
The oil solution, component (B), and other oil phase components are mixed, heated and dissolved to prepare a mixture of oil phase components. When the oil-dispersible ultraviolet light scattering agent and the ultraviolet light absorbing agent (component (D)) are contained, the ultraviolet light scattering agent is added to the mixture and dispersed using a disper.
Next, the mixture of the oil phase component is added to the mixture of the heated aqueous phase component which is mixed with the aqueous phase component and the component (A) and heated to prepare a mixture of the aqueous phase component, and the mixture is emulsified with a homogenizer. After emulsification, a water dispersible ultraviolet light scattering agent (component (D)) is added if necessary, and the mixture is cooled with stirring to produce the sunscreen cosmetic of the present invention.

  Hereinafter, the present invention will be described in more detail by way of examples, but it goes without saying that the present invention is not limited to only such examples.

<Production example>
According to the formulation shown in Table 1, the oil-in-water sunscreen cosmetics of Examples 1 to 6 and Comparative Examples 1 to 3 were produced by the following method.
(A) was mixed, heated and dissolved to prepare a mixture of oil phase components, and hydrophobized fine particles of titanium oxide were dispersed using a disper.
Next, (A) was added to the mixed and heated (A) and emulsified with a homogenizer. After emulsification, (c) was added and a sunscreen cosmetic was produced by cooling with stirring and mixing.

※注１「ＳＩＭＵＬＧＥＬ ＥＧ」（セピック社製）
アクリロイルジメチルタウリンＮａ／アクリル酸Ｎａ共重合体（４０質量％）を含有し、他に、イソヘキサデカン、モノオレイン酸ポリオキシエチレンソルビタン(２０Ｅ.Ｏ.)、モノオレイン酸ソルビタン、精製水を含有。

※ Note 1 "SIMULGEL EG" (manufactured by Sepik)
Acryloyldimethyltaurine Na / sodium acrylate copolymer (40% by mass) is contained, and in addition, isohexadecane, polyoxyethylene sorbitan monooleate (20E.O.), sorbitan monooleate, purified water.

<Test example>
With regard to the oil-in-water type sunscreen cosmetic prepared in Examples 1 to 6 and Comparative Examples 1 to 3, the emulsion stability, no stickiness when used, and skin familiarity were evaluated according to the following criteria. The results are shown in Table 1.
・ Emulsification stability (state when stored at room temperature for 1 month)
・ ・ ・ · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · ·
△ × ... oil film on the surface of the formulation is stands out ... clearly the oil phase separation is observed.
-No stickiness ・ ・ ・ · · · no sense of stickiness ○ · · · almost no stickiness · · · slightly stickiness · · · feel familiar · skin familiar · · · familiar Very good ○ · · · skin familiarity ・ ・ ・ · · · skin familiarity is slightly poor × · · skin familiarity is poor

As shown in Table 1, the oil-in-water sunscreen cosmetics of Examples 1 to 6 containing all the components (A) to (D) have good emulsion stability, no stickiness, and skin familiarity. I had it.
On the other hand, the sunscreen cosmetic of Comparative Example 1 which does not contain the component (A) had a fairly sticky feeling. Moreover, the sunscreen cosmetics of the comparative example 2 which does not contain a component (B), and the sunscreen cosmetics of the comparative example 3 which does not contain a component (C) were inferior to emulsion stability.
These results show that the oil-in-water type sunscreen cosmetic comprising the components (A) to (D) has excellent emulsion stability, no stickiness and skin compatibility.

Also, as shown in Table 1, the sunscreen cosmetic of Example 1 containing sodium stearyl lactate as component (C) is compared with the sunscreen cosmetic of Example 4 containing sodium cocoglyceryl sulfate as component (C) It is excellent in emulsion stability.
This result indicates that the oil-in-water type sunscreen cosmetic containing sodium acyl lactate as the component (C) is excellent in emulsion stability.

In addition, as shown in Table 1, the sunscreen cosmetic of Example 1 containing polyglycerin of pentastearate-10 as component (B) contains polyglyceryl-10 tristearate as component (B). Emulsification stability is superior to sunscreen cosmetics.
This result indicates that an oil-in-water sunscreen cosmetic comprising polyglycerin pentastearate-10 as the component (B) is excellent in emulsion stability.

In addition, as shown in Table 1, the sunscreen cosmetic of Example 1 containing sodium polyacrylate-coated fine particle titanium dioxide as the ultraviolet light scattering agent of the component (D) does not contain the coated fine particle titanium dioxide. It is superior in skin familiarity compared with sunscreen cosmetics.
As a result, the ultraviolet light scattering agent surface-treated with sodium polyacrylate as the component (D), that is, the oil-in-water sunscreen cosmetic containing the water-dispersible ultraviolet light scattering agent has excellent skin familiarity It is shown that.

In addition, the sunscreen cosmetic of Example 1 has an emulsion stability compared to the sunscreen cosmetic of Examples 2 and 3 in which the content of the component (B) is 0.3% by mass and 7% by mass, respectively. It is excellent in sex and no feeling of stickiness.
The results show that the content of the component (B) is preferably 0.5% by mass or more from the viewpoint of improving the emulsion stability, and 5% by mass or less from the viewpoint of the emulsion stability and the suppression of stickiness. Indicates that it is preferable.

In addition, the sunscreen cosmetic of Example 1 is compared with the sunscreen cosmetic of Example 2 and Example 3 in which the content of the component (C) is 0.05% by mass and 1.5% by mass, respectively. Excellent emulsion stability and no sticky feeling.
The result shows that the content of the component (C) is preferably 0.07% by mass or more from the viewpoint of improving the emulsion stability, and 1% by mass or less from the viewpoint of the emulsion stability and the suppression of stickiness. Indicates that it is preferable.

  The present invention can be applied to sunscreen cosmetics.

Claims (6)

An oil-in-water emulsion cosmetic comprising components (A) to (D).
(A) (sodium acrylate / acryloyldimethyltaurine) copolymer (B) Polyglycerin fatty acid ester (C) formed by ester bonding of one polyglycerin having a polymerization degree of 10 and 2 to 5 molecules of a fatty acid of C16 or more Surfactant (D) UV scattering agent and / or UV absorber The oil-in-water emulsified cosmetic according to claim 1, wherein the component (C) is anionic surfactant. The oil-in-water emulsified cosmetic according to claim 2, wherein the anionic surfactant is sodium acyl lactate. The oil-in-water emulsion cosmetic according to any one of claims 1 to 3, wherein the component (B) is polyglyceryl pentastearate. The oil-in-water emulsified cosmetic according to any one of claims 1 to 4, wherein the component (D) is a water-dispersible ultraviolet light scattering agent. The oil-in-water emulsified cosmetic according to claim 5, wherein the water-dispersible ultraviolet light scattering agent is an ultraviolet light scattering agent surface-treated with sodium polyacrylate.