JP5084021B2 - Sunscreen cosmetics - Google Patents

Description

  The present invention relates to a sunscreen cosmetic. More specifically, volatile organopolysiloxane is used as a dispersion medium, and surface-treated metal oxide fine particles are dispersed with a dispersant in the presence of an organic ultraviolet absorber, which has excellent dispersion stability during storage. Related to sunscreen cosmetics.

  In order to prevent the adverse effects of UV rays on the skin, sunscreen cosmetics containing metal oxide fine particles and organic UV absorbers have been developed and are generally used. In other words, fine particles of metal oxides such as zinc oxide as sunscreen makeup effectively protect the long-wavelength ultraviolet region (320-400 nm), which causes skin darkening among ultraviolet rays, and are highly transparent in the visible region. Generally blended into the ingredients. Moreover, in order to protect the medium wavelength ultraviolet region (280-320 nm) which causes erythema on the skin, an organic ultraviolet absorber is generally blended. Furthermore, sunscreen cosmetics in which metal oxide fine particles and an organic ultraviolet absorber are blended together are well known.

  The metal oxide fine particles are blended and used in cosmetics, but it is difficult to stably disperse because of their strong cohesive strength. This tendency becomes stronger as the particles are made smaller to increase the UV protection. For this reason, as means for stably dispersing, various methods have been proposed, such as a method for treating the surface of the particles to increase the dispersibility, and a dispersing agent with good dispersion performance for dispersing fine particles. Regarding the method of surface-treating fine particles to improve their dispersibility, a technique of treating metal oxide fine particles with a surface treatment agent to make them hydrophobic, for example, a technique of surface-treating with dimethicone / methicone copolymer (Patent Document 1), organic A technique (Patent Document 2) for surface-treating powder with a specific silicone having a group and a reactive group with particles has been proposed. As for the dispersant for dispersing the powder, a technique for dispersing fine powder of an inorganic compound with a polyether-modified methylpolysiloxane having a specific HLB (Patent Document 3), as a dispersant for dispersing the powder in an oil phase, An oil-in-water emulsified cosmetic using a methacrylic acid-containing acrylic silicone (Patent Document 4) has been proposed. Furthermore, alkyl group and polyoxyalkylene group co-modified silicones have been proposed as silicone compounds having excellent emulsifying performance for various oils (Patent Document 5).

JP 2003-95655 A JP 2001-72891 A JP-A-10-167946 JP 2005-247722 A JP 2001-39819 A

  As described above, various techniques for stably dispersing metal oxide fine particles have been proposed for sunscreen cosmetics. However, compounding components such as a solvent, a dispersant, surface-treated metal oxide fine particles, and an organic ultraviolet absorber Depending on the combination of the above, it is difficult to prevent the aggregation of metal oxide fine particles, and over time, the metal oxide fine particles aggregate, settle, and bulk gel, and it is difficult to ensure dispersion stability during storage. . The present invention uses a volatile organopolysiloxane as a dispersion medium, and in the presence of an organic ultraviolet absorber, a sunscreen cosmetic in which surface-treated metal oxide fine particles are dispersed with a dispersant. An object of the present invention is to provide an excellent sunscreen cosmetic.

  As a result of intensive studies to solve the above problems, the present inventors used volatile organopolysiloxane as a dispersion medium, and dispersed surface-treated metal oxide fine particles in the presence of an organic ultraviolet absorber. In sunscreen cosmetics dispersed with an agent, a silicone compound is used as both the surface treatment agent and the dispersant for the metal oxide fine particles, and specific silicone compounds are selected and combined with these silicone compounds, respectively. Thus, the inventors have found that the effect of preventing the aggregation and sedimentation of the powder and the gelation of the system can be exhibited, and the present invention has been completed.

That is, the present invention comprises (a) volatile organopolysiloxane 10 to 55 % by mass , (b) silicone-based dispersant 0.1 to 20% by mass , (c) silicone surface-treated metal oxide fine particles 1 to 50% by mass. And (d) a sunscreen cosmetic containing 0.1 to 25% by mass of an organic ultraviolet absorber, wherein the silicone dispersant of the component (b) is represented by the following general formula (1): The silicone surface-treated metal oxide fine particles of the component (c) are metal oxide fine particles surface-treated with a silicone compound represented by the following general formula (2): It is a sunscreen cosmetic.

  As for the compounding quantity of the silicone type dispersing agent of the said component (b), 0.1-20 mass% is preferable. The amount of the silicone surface-treated metal oxide fine particles as the component (c) is preferably 1 to 50% by mass, and the metal oxide fine particles are preferably zinc oxide fine particles or titanium oxide fine particles. Further, the blending amount of the organic ultraviolet absorber as the component (d) is preferably 0.1 to 25% by mass, and as this organic ultraviolet absorber, 2-ethylhexyl paramethoxycinnamate is preferable. Moreover, the dosage form of the sunscreen cosmetic is preferably a water-in-oil type.

  In sunscreen cosmetics in which volatile organopolysiloxane is used as a dispersion medium and surface-treated metal oxide fine particles are dispersed with a dispersant in the presence of an organic UV absorber, the presence of the organic UV absorber However, there are problems such that gelation of the system with time tends to occur and metal oxide fine particles aggregate and settle. However, the silicone compound represented by the general formula (1) is used as a dispersant, and the silicone compound represented by the general formula (2) is used as a surface treatment agent for metal oxide fine particles. Sunscreen cosmetics are excellent in stability during storage without aggregation or sedimentation of metal oxide fine particles and gelation of the system over time. Further, in the sunscreen cosmetics, if the dispersion of the metal oxide fine particles is poor, not only the ultraviolet shielding effect is not sufficient, but also whitening becomes conspicuous when applied to the skin, but the sunscreen cosmetics of the present invention. Is highly dispersed and has the effect of not whitening even when applied to the skin.

Each component of the sunscreen cosmetic of the present invention will be described.
The component (a) volatile organopolysiloxane used in the present invention is a dispersion medium of metal oxide fine particles. In sunscreen cosmetics, volatile organopolysiloxanes are generally used as a dispersion medium for metal oxide fine particles. Volatile organopolysiloxanes include octamethylcyclotetrasiloxane, decamethylcyclopentasiloxane, dodecamethylcyclohexasiloxane, hexamethyldisiloxane, octamethyltrisiloxane, decamethyltetrasiloxane, methyltrimethicone, etc. You may mix | blend individually or in combination of 2 or more types. Of these, decamethylcyclopentasiloxane, dodecamethylcyclohexasiloxane, octamethyltrisiloxane, and decamethyltetrasiloxane are particularly preferable from the viewpoint of volatilization rate and powder wettability.
As for the compounding quantity to the sunscreen cosmetics of a component (a), 10-55 mass% is preferable. When the amount is less than 10% by mass, the amount of other oils is inevitably increased in order to obtain a stable sunscreen cosmetic, and therefore, it is difficult to obtain the merit of volatile silicone formulation such as a refreshed feeling of use. If it exceeds 55% by mass, the familiarity during application becomes slow and the feeling of use becomes oily, which is not preferable.

  The silicone-based dispersant of component (b) used in the present invention is a silicone compound represented by the general formula (1). The silicone compound represented by the general formula (1) is a kind of silicone compound described in Patent Document 5. The silicone compound represented by the general formula (1) has a linear methylpolysiloxane in the main chain, and a part of the methyl group is substituted with an alkyl group having 8 to 14 carbon atoms, a polyoxyethylene group, and methylpolysiloxane. It has a structure substituted with a siloxane group. The alkyl group having 8 to 14 carbon atoms is introduced into the molecule in order to adjust the compatibility with the organic ultraviolet absorber. This alkyl group is particularly preferably a lauryl group. Moreover, the polyoxyethylene group is introduced into the molecule in the hope of becoming an adsorption point with the powder. Depending on the length of the main chain and the amount of alkyl group having 8 to 14 carbon atoms, polyoxyethylene group, and methylpolysiloxane group, the adsorptivity to the powder and the volatile organopolysiloxane or organic ultraviolet absorber There is a difference in compatibility. In the present invention, for the silicone compound represented by the general formula (1), x, which determines the length of the main chain and the introduction amount of an alkyl group having 8 to 14 carbon atoms, a polyoxyethylene group, and a methylpolysiloxane group By setting y, z, p, a, and b to specific ranges, these functions are exhibited to the maximum to provide excellent dispersion performance.

  0.1-20 mass% is preferable, and, as for the compounding quantity to the sunscreen cosmetics of a component (b), More preferably, it is 1-10 mass%. When the amount is less than 0.1% by mass, the dispersibility is poor and the metal oxide fine particles are aggregated and settled. On the other hand, if it exceeds 20% by mass, gelation of the system with time tends to occur and stickiness is felt, which is not preferable.

  The silicone surface-treated metal oxide fine particles of the component (c) used in the present invention are metal oxide fine particles surface-treated with the silicone compound represented by the general formula (2). The silicone compound represented by the general formula (2) is a kind of silicone compound described in Patent Document 2. The silicone compound represented by the general formula (2) has a linear methylpolysiloxane in the main chain, and part of the methyl group is an alkyl group having 4 to 12 carbon atoms, a triethoxysilane group, and a methylpolysiloxane. It has a structure substituted with a group. The alkyl group having 4 to 12 carbon atoms is introduced into the molecule in order to adjust the wettability between the powder surface-treated with the compound of the general formula (2) and the organic ultraviolet absorber. This alkyl group is particularly preferably a hexyl group. The triethoxysilane group is introduced into the molecule as a reactive group on the surface of the metal oxide fine particles. And the wettability of the powder surface-treated with the compound of the general formula (2) varies depending on the introduction amount of the alkyl group having 4 to 12 carbon atoms and the methylpolysiloxane group, and the initial dispersibility and storage stability are affected. Can be a factor. In the present invention, by making W, X, Y, Z and n of the silicone compound represented by the general formula (2) into a specific range, the function as a surface treating agent for the metal oxide fine particles is maximized. And surface-treated metal oxide fine particles that can be satisfactorily dispersed by the silicone-based dispersant of the general formula (1).

  The metal oxide fine particles preferably have a primary particle diameter of 1 μm or less, preferably 0.1 μm or less as measured by a laser diffraction method. As the metal oxide fine particles, zinc oxide fine particles and titanium oxide fine particles are preferably used. The metal oxide fine particles may be metal oxide fine particles treated with silica or alumina. Here, the primary particle diameter is the average particle diameter of the primary particles. Examples of commercially available zinc oxide fine particles having a primary particle diameter of 1 μm or less include FINEX-50 manufactured by Sakai Chemical Industry Co., Ltd., ZnO-350 manufactured by Sumitomo Osaka Cement Co., Ltd., and zinc oxide manufactured by Ishihara Sangyo Co., Ltd. Examples thereof include FZO-50, fine particle zinc oxide MZ-500 manufactured by Teika Corporation. Examples of commercially available titanium oxide fine particles include STR-60 and STR-100 manufactured by Sakai Chemical Industry Co., Ltd. and MT-500B manufactured by Teika Co., Ltd.

  The surface treatment of the metal oxide fine particles with the silicone compound represented by the general formula (2) can be performed by a conventionally known method. That is, for example, (i) a method in which metal oxide fine particles are dispersed in a medium selected from water or an organic solvent containing a silicone compound represented by the general formula (2), and (ii) a metal. A method in which oxide fine particles and a silicone compound represented by the general formula (2) are mixed and then surface-treated using a pulverizer such as a ball mill or a jet mill; (iii) a silicone compound represented by the general formula (2) The metal oxide fine particles are dispersed in the above solvent solution, the silicone compound is adsorbed on the surface of the metal oxide fine particles, and then dried and sintered. 0.1-12 mass% is preferable and, as for the quantity of the surface treating agent (silicone compound) with respect to metal oxide microparticles | fine-particles, More preferably, it is 3-8 mass%. Moreover, the compounding quantity to the sunscreen cosmetics of a component (c) becomes like this. Preferably it is 1-50 mass%, More preferably, it is 5-35 mass%. If it is less than 1% by mass, a sufficient ultraviolet protective effect cannot be obtained. Moreover, when it exceeds 50 mass%, it is not preferable in terms of storage stability because it tends to settle, and it is not preferable because it gives a powdery feeling.

  The organic ultraviolet absorber of component (d) used in the present invention is generally used in cosmetics. For example, cinnamic acid derivatives, para-aminobenzoic acid derivatives, salicylic acid derivatives, β, β- Examples thereof include diphenyl acrylate derivatives, benzophenone derivatives, benzylidene camphor derivatives, phenylbenzimidazole derivatives, phenylbenzotriazole derivatives, anthranyl derivatives, imidazoline derivatives, benzalmalonate derivatives, 4,4-diarylbutadiene derivatives, and the like. Of these, cinnamic acid derivatives are particularly preferred.

  Examples of the cinnamic acid derivative include 2-methoxyhexyl paramethoxycinnamate (eg, “Ubinur MC80”; manufactured by BASF), isopropyl methoxycinnamate, and isoamyl methoxycinnamate (eg, “Neo Heliopan E1000”). Herman & Reimer), cinnoxate, DEA methoxycinnamate, diisopropyl methylcinnamate, glyceryl-ethylhexanoate-dimethoxycinnamate, and the like. Of these, 2-ethylhexyl paramethoxycinnamate is particularly preferred.

  The amount of the component (d) to be added to the sunscreen cosmetic is preferably 0.1 to 25% by mass, more preferably 3 to 20% by mass. In the present invention, the silicone compound represented by the general formula (1) is used as a dispersant, and the silicone compound represented by the general formula (2) is used as a surface treatment agent for metal oxide fine particles. In order to efficiently protect the mid-wavelength ultraviolet region (280 to 320 nm), even if it is a system containing 3% by mass or more of an organic ultraviolet absorber, it exhibits a high sunscreen effect and also aggregates over time. No sedimentation or gelation of the system, and excellent stability during storage.

  The sunscreen cosmetic of the present invention can be prepared by a conventional method using other components in combination as necessary. For example, it can be carried out in various forms such as liquid, emulsion, cream, gel, and paste. Examples of the cosmetic dosage form include a water-in-oil type, an oily (substantially free of water), and an oil-in-water type. Among these, a water-in-oil type is preferable. Moreover, the sunscreen cosmetics of the present invention can be implemented in products such as sunscreen emulsions, sunscreen creams, makeup bases, foundations, sunscreen lip balms and the like.

  The sunscreen cosmetic of the present invention can be blended with components generally used in cosmetics in addition to the above components, as long as the effects of the present invention are not impaired. Examples of such components include water, fats and oils, waxes, hydrocarbons, fatty acids, alcohols, ester oils, ether oils, silicone oils, fluorine compounds and other oil agent raw materials, and powder raw materials other than component (c). , Metal soaps, surfactants, silicone surfactants other than component (b), polyhydric alcohols, antioxidants, polymer compounds, fragrances, preservatives, moisturizers, pH adjusters, cosmetic ingredients, pigments, fragrances Etc.

The present invention will be described in detail with reference to examples and comparative examples. Unless otherwise specified, the amount is shown in mass%. First, the silicone-based dispersant and the silicone surface-treated metal oxide used in Examples and Comparative Examples will be described.
A. Silicone-based dispersant used in Examples and Comparative Examples and Production Example 1 Silicone dispersants used in the examples and production examples thereof (Production Example 1)
In the reactor, 560 parts by mass of an organohydrogenpolysiloxane represented by the following average composition formula (1-1), 210 parts by mass of an organopolysiloxane represented by the following average composition formula (1-2) and 480 parts by mass of isopropyl alcohol Were mixed, 0.2 parts by mass of an isopropyl alcohol solution containing 2% by mass of chloroplatinic acid was added, and the mixture was reacted for 3 hours under reflux of the solvent. Furthermore, after adding 460 parts by mass of 1-dodecene and continuing the reaction for 3 hours under reflux of the solvent, 380 parts by mass of polyoxyethylene monoallyl ether represented by the following average composition formula (1-3) was added, The reaction was completed by further refluxing for 6 hours. Subsequently, 200 mass parts of 0.01N hydrochloric acid aqueous solution was added, and the allyl ether group of the unreacted polyoxyalkylene was hydrolyzed by heating at 60-70 degreeC. The reaction solution was heated under reduced pressure to distill off the solvent, followed by filtration to obtain an organopolysiloxane represented by the following average composition formula (1-4). This product was a pale yellow transparent liquid, the viscosity was 1120 mm ² / s (25 ° C.), and the refractive index was 1.4401 (25 ° C.).

2. Silicone dispersants used in comparative examples and production examples thereof (comparative production examples 1 to 5)
Except having changed the mass ratio of each raw material of manufacture example 1, it carried out similarly to manufacture example 1, and obtained organopolysiloxane of comparative manufacture examples 1-5. The ratio of raw materials and physical properties are shown in Table 1.

B. Silicone surface-treated zinc oxide particles used in Examples and Comparative Examples and production examples thereof 1. Production examples of silicone used in surface treatment (Production Example 2)
The reactor was charged with 1200 parts by mass of an organohydrogenpolysiloxane represented by the following average composition formula (2-1) and 920 parts by mass of toluene, and 3 parts by mass of a toluene solution of 0.5% by mass of chloroplatinic acid was added. Subsequently, a mixture of 1330 parts by mass of the organopolysiloxane represented by the above average composition formula (1-2) and 180 parts by mass of 1-hexene was dropped, and further 380 parts by mass of vinyltriethoxysilane was dropped while the solvent was refluxed. For 6 hours. The reaction product was heated under reduced pressure to distill off the solvent, and an organopolysiloxane represented by the following average composition (2-2) was obtained. This product was a light brown transparent liquid with a viscosity of 47 mm ² / s (25 ° C.) and a refractive index of 1.4121 (25 ° C.).

2. Production example of silicone used for surface treatment (Production Example 3)
The organopolysiloxane of Production Example 3 was obtained in the same manner as Production Example 2 except that the mass ratio of each raw material of Production Example 2 was changed. The raw material ratio and physical properties are shown in Table 2.

3. Surface Treatment of Zinc Oxide Fine Particles 50 parts by mass of untreated zinc oxide fine particles having an average particle diameter of 20 to 30 nm (MZ-500 manufactured by Teika Co., Ltd.) previously charged in a reactor were obtained in Production Example 2 or Production Example 3. The solution was prepared by gradually adding a solution obtained by diluting 2.5 parts by mass of the silicone compound to 100 parts by mass of hexane. Further, the temperature was raised and hexane was distilled off, followed by baking at 150 ° C. for 3 hours. Then, the powder was returned to room temperature under a nitrogen stream to obtain silicon surface-treated zinc oxide fine particles. Silicone surface-treated titanium oxide fine particles were also obtained by the same surface treatment.

Examples 1-4 and Comparative Examples 1-8. W / O-type sunscreen cosmetics Sunscreens (W / O-type emulsions) having the compositions shown in Table 3 were prepared by the following production method, and the initial dispersibility and stability over time (storage stability) were: Evaluation was performed by the method shown below. The results are also shown in Table 3.

(Production method)
A: Components 1 to 12 were put in a standard bottle, zirconia beads were added twice the total mass of components 1 to 12, and mixed and dispersed for 15 hours with a paint shaker, and the zirconia beads were removed to obtain a powder dispersion.
(B) While stirring the powder dispersion obtained in (a) with a desperse mill, ingredients 13 to 16 were sequentially added and mixed for 10 minutes.
C: Components 17 to 19 were added to B while stirring with a desper and emulsified for 10 minutes to obtain a W / O type sunscreen.

(Evaluation)
The initial dispersibility and stability over time in Table 3 were evaluated as follows.
1. The initial dispersibility is that immediately after production, 200 μl of sunscreen cosmetic is dropped onto a quartz plate, a thin film is drawn using a 6 mil doctor blade, and the transmission spectrum from the visible part (750 nm) to the ultraviolet part (250 nm) is measured. And it judged from the following evaluation criteria.
[Evaluation criteria]
The evaluation was carried out by judging that the lower the transmittance at 360 nm, the less the powder agglomerates and the higher the dispersion.
[Determination] Transmittance at 360 nm ◎: Less than 20% ○: 20% to less than 30% Δ: 30% to less than 40% x: 40% or more

2. Stability over time was determined by the following criteria by observing the state visually after storing for 1 month at 5 ° C., 50 ° C., and room temperature.
[Evaluation criteria]
The presence or absence of gelation or separation was determined.
[Judgment]
◎: Gelation is not seen and freezing ○: The degree of gelation is low and there is a slight thickening △: Gelation is seen and does not flow even when tilted, but fluidity appears when shaken by hand ×: Gelled, does not move even when inverted, and gel does not collapse even when shaken by hand. XX: Powder settles and separates.

As is clear from the results in Table 3, the sunscreen cosmetics of Examples 1 to 4 have high initial dispersibility, and good dispersibility after storage at 50 ° C., room temperature and 5 ° C. for 1 month, It was a sunscreen cosmetic that did not cause system gelation or powder settling and was excellent in dispersion stability over time. On the other hand, as a surface treatment agent for metal oxide fine particles, sunburn using dimethicone / methicone copolymer (Comparative Example 1) or methicone (Comparative Example 2) instead of the silicone compound represented by the general formula (2) of the present invention. The stop cosmetics had good initial dispersion, but the gelation of the system occurred with time, and the dispersion stability with time was poor. Further, the sunscreen cosmetic of Comparative Example 3 using unsurface-treated zinc oxide fine particles had poor initial dispersibility and poor temporal dispersion stability. Further, in place of the silicone compound represented by the general formula (1) of the present invention as a dispersant, the length of the main chain and the introduction amount of lauryl group, polyoxyethylene group and methylpolysiloxane group are determined x , Y, z, p and b are sunscreen cosmetics of Comparative Examples 4 to 8 using a silicone compound (Comparative Production Examples 1 to 5) not within the scope of the present invention, although the initial dispersibility is good The gelation of the system occurred over time, and the dispersion stability over time was poor.

Example 5 FIG. O / W type sunscreen latex Ingredient (%)
(1) Silicone 5% treated zinc oxide fine particles of Production Example 2 10.0
(2) Vinylpyrrolidone-modified acrylic-silicone copolymer (Note 3) 2.0
(3) Decamethylcyclopentacyclosiloxane 10.0
(4) Silicone compound of Production Example 1 3.0
(5) PEG11 methyl ether dimethicone 2.0
(6) Beeswax 2.0
(7) Squalane 6.0
(8) Methylpolysiloxane (10CS) 5.0
(9) Sorbitan sesquioleate ester 4.0
(10) Polyoxyethylene / methylpolysiloxane copolymer (Note 4) 1.0
(11) 2-Ethylhexyl paramethoxycinnamate 8.0
(12) 1,3-butylene glycol 8.0
(13) Preservative appropriate amount (14) Purified water Remaining amount (15) Fragrance appropriate amount (Note 3) KP-545 (manufactured by Shin-Etsu Chemical Co., Ltd.)
(Note 4) KF-6017 (manufactured by Shin-Etsu Chemical Co., Ltd.)

(Production method)
A: Components (1) to (4) were put on a paint shaker for 15 hours and mixed and dispersed uniformly. (5) to (11) were dissolved in this by heating to 70 ° C.
B: (12) to (14) were dissolved by heating to 70 ° C., and this was added to A and emulsified and mixed for 10 minutes.
C: After cooling, (15) was added and mixed to obtain a sunscreen emulsion.
The O / W-type sunscreen emulsion obtained as described above was a cosmetic that showed high dispersibility immediately after production and excellent storage stability.

Example 6 O / W cream foundation ingredients (%)
(1) Decamethyltetrasiloxane 10.0
(2) 2-Ethylhexyl paramethoxycinnamate 5.0
(3) Silicone 7% -treated zinc oxide fine particles of Production Example 3 8.0
(4) Silicone compound of Production Example 1 5.0
(5) Stearic acid 5.0
(6) Lipophilic glyceryl monostearate 2.5
(7) cetostearyl alcohol 1.5
(8) Behenyl alcohol 1.0
(9) Isopropylene glycol monolaurate 2.5
(10) Isopropyl myristate 6.0
(11) Purified water remaining amount (12) Triethanolamine 1.2
(13) Sorbitol 3.0
(14) Methyl paraoxybenzoate Appropriate amount (15) Silicone 7% treated titanium oxide fine particles of Production Example 2 5.0
(16) Kaolin 5.0
(17) Black iron oxide 1.0
(18) Bengala 2.5
(19) Yellow iron oxide 2.0
(20) Bentonite 0.2

(Production method)
A: (1) to (4) were uniformly mixed and dispersed with a paint shaker.
B: (15) to (19) were mixed at room temperature.
C: Part of (11) was added to (20) and allowed to swell well. Next, the remainder of (11) and (12) to (14) were added and dissolved. To this, the mixture of A and B was added and mixed at 70 ° C. (aqueous phase).
D: (5) to (10) were dissolved at 70 ° C. (oil phase).
(E) The (oil phase) obtained in (ii) was added to the (water phase) obtained in (c) and emulsified for 10 minutes. After the emulsification, the mixture was stirred and cooled to 35 ° C.
The O / W cream foundation obtained as described above had high powder dispersibility immediately after production, did not gel with time, and had excellent storage stability.

Example 7 W / O Liquid Foundation Ingredient (%)
(1) Silicone 5% treated zinc oxide fine particles of Production Example 3 10.0
(2) Silicone compound of Production Example 1 5.0
(3) Decamethylcyclopentasiloxane 20.0
(4) Acrylic-silicone graft copolymer (Note 5) 5.0
(5) Glyceryl tri-2-ethylhexanoate 3.0
(6) Propylene glycol dicaprate 3.0
(7) Di-2-ethylhexanoic acid neopentyl glycol 3.0
(8) Sucrose fatty acid ester 0.5
(9) Organically modified bentonite 1.0
(10) 2-Methylhexyl paramethoxycinnamate 7.0
(11) Titanium oxide 9.0
(12) Bengala 0.6
(13) Yellow iron oxide 2.1
(14) Black iron oxide 0.15
(15) Talc 5.0
(16) Spherical PMMA powder 0.5
(17) Decaglyceryl heptaoleate 1.0
(18) Sorbitan sesquioleate 1.0
(19) Polyoxyethylene
Methyl polysiloxane copolymer (Note 6) 1.0
(20) Polyoxyethylene
Alkyl-modified silicone (Note 7) 1.0
(21) Synthetic sodium silicate / magnesium (Note 8) 0.3
(22) Ethanol 1.5
(23) Preservative Trace amount (24) Propylene glycol 5.0
(25) Purified water remaining
(Note 5): KP-545: manufactured by Shin-Etsu Chemical Co., Ltd.
(Note 6): KF6017: Shin-Etsu Chemical Co., Ltd.
(Note 7): Avil EM-90: Gold Schmidt
(Note 8): LAPONITE XLS: manufactured by LAPONITE

(Production method)
A: Components (1) to (3) were uniformly dispersed with a microfluidizer (manufactured by Microfluidics) = high pressure homogenizer.
B: (4) to (8), (10), (17) to (20) were heated and dissolved, mixed uniformly, and allowed to cool.
C: Components (9) and (11) to (16) were added to (b) and mixed uniformly with a roll mill.
D: C was added to A and mixed uniformly.
E: Components (21) to (25) were uniformly mixed.
F: Added to Ni while stirring, emulsified, defoamed, and filled into a wide-mouthed bottle to obtain a liquid foundation.
The W / O type liquid foundation obtained as described above is excellent in the dispersibility of the powder at the initial stage of manufacture, and also excellent in stability, without gelation or aggregation of the powder over time. Met.

Example 8 FIG. Sunscreen lip balm (ingredient) (%)
(1) Polyethylene wax 2.0
(2) Ceresin 1.0
(3) Microcrystalline wax 5.0
(4) Diisostearyl malate 9.0
(5) Polyglyceryl triisostearate remaining amount (6) Vaseline 10.0
(7) Polybutene 10.0
(8) Heavy liquid isoparaffin 9.0
(9) Cetyl 2-ethylhexanoate 16.0
(10) Dodecamethylcyclohexasiloxane 10.0
(11) Silicone compound of Production Example 1 3.0
(12) Silicone 5% -treated zinc oxide fine particles of Production Example 2 7.0
(13) 2-Ethylhexyl paramethoxycinnamate 7.0
(14) Preservative 0.1
(15) Fragrance 0.1

(Production method)
A: (10) to (13) were dispersed by bead milling for 15 hours.
B: After adding (1) to (9), (14) and (15) and mixing and dispersing this with a roller, the mixture was heated and dissolved, and then added and mixed uniformly.
D: Ha was filled into a container and rapidly cooled to obtain a sunscreen lip balm.
The sunscreen lip balm obtained as described above had good dispersibility of the metal oxide fine particles and did not change with time even after storage at 50 ° C., room temperature and 5 ° C. for 1 month.

Claims (4)

(A) 10 to 55% by mass of volatile organopolysiloxane, (b) 0.1 to 20% by mass of silicone dispersant, (c) 1 to 50% by mass of silicone surface-treated metal oxide fine particles , and (d) organic A sunscreen cosmetic containing 0.1 to 25% by mass of an ultraviolet absorber, wherein the silicone dispersant of the component (b) is a silicone compound represented by the following general formula (1): A sunscreen cosmetic, wherein the silicone surface-treated metal oxide fine particles of component (c) are metal oxide fine particles surface-treated with a silicone compound represented by the following general formula (2):

  The sunscreen cosmetic according to claim 1, wherein the metal oxide fine particles of the silicone surface-treated metal oxide fine particles of component (c) are zinc oxide fine particles or titanium oxide fine particles.   The sunscreen cosmetic according to claim 1 or 2, wherein the organic ultraviolet absorber of component (d) is 2-ethylhexyl paramethoxycinnamate.   The sunscreen cosmetic according to any one of claims 1 to 3, wherein the dosage form is a water-in-oil type.