JP2002060329A - Sunscreening cosmetic - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prepare sunscreening cosmetic good in dispersion of fine particles of zinc oxide and excellent in protective effect on UV expressed by SPF(Sun Protection Factor) and PFA(Protection Factor of UVA), or the like, transparency of finish and stability in the dispersion system. SOLUTION: This sunscreening cosmetic is obtained by dispersing fine composite particles of zinc oxide which are coated with silica and then treated with a silicone in oil or water, in an agitating mill or a high pressure-dispersing machine. The sunscreening cosmetic includes a polysiloxane modified with a polyoxyalkylene. The sunscreening cosmetic is formulated with >=1 wt.% of powder having Surfaces treated with a fatty acid, a fatty acid soap or a fatty acid ester.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sunscreen cosmetic containing finely divided zinc oxide, and more particularly to an improvement in its stability and ultraviolet ray preventing effect.

[0002]

2. Description of the Related Art Hitherto, a large amount of particulate zinc oxide has been incorporated into sunscreen cosmetics for the purpose of preventing long-wavelength ultraviolet rays. In the case of blending zinc oxide fine particles mainly in a W / O emulsified sunscreen cosmetic, a powder whose surface is subjected to a hydrophobic treatment is generally used. Examples of the hydrophobic treatment include silicone, metal soap, fatty acid, and fluorine compound.

[0003]

However, it is very difficult to highly disperse such surface-treated fine particle zinc oxide at a high level, and at present, the effect of preventing ultraviolet rays cannot be improved as expected. If a high-dispersion machine such as a medium stirring mill or a high-pressure disperser is used for high-dispersion, the effect of preventing ultraviolet rays is improved, but the surface treatment agent is peeled off and the hydrophilic untreated surface is exposed, so that aggregation in the aqueous phase occurs. Gelation occurs by reacting easily with free fatty acids in the system,
It had the disadvantage that the stability was significantly worse in long-term storage.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and has as its object to disperse fine zinc oxide particles and to have an excellent effect of preventing SPF value and PFA value from ultraviolet rays, excellent transparency of finish and stability in the system. To provide sunscreen cosmetics.

[0005]

Means for Solving the Problems The present inventors have conducted a surface treatment of silicic acid anhydride in a state where fine zinc oxide particles are close to primary particles, and then a silicone treatment, and the mixture is subjected to a medium stirring mill or a high-pressure dispersion. Even when a strong mechanical force such as a mechanical machine is applied, there is no reaction with water due to the exposure of the untreated surface, and the inside of the system caused by fatty acids and fatty acid soaps used as dispersants and surface treatment agents for other powders Did not react with free fatty acids (gelation reaction due to the generation of metal soap), and found that a comfortable use feeling was maintained. Furthermore, because the powder is highly dispersed, SPF of sunscreen cosmetics
(SUN PROTECTION FACTOR) and PFA (PROTECTION FA
CTOR OF UVA).

That is, the sunscreen cosmetics of the present invention
The composite powder of fine zinc oxide coated with silicic anhydride and further treated with silicone is dispersed in oil or water with a medium stirring mill or a high-pressure disperser.
Further, in the sunscreen cosmetic of the present invention, the composite powder coats fine particle zinc oxide having a particle size of 0.1 μm or less with silicic anhydride at a coverage of 5 to 30% by weight, and further contains silicone at 3 to 12% by weight. It is preferable that the surface-treated powder is used.

[0007] In the sunscreen cosmetics of the present invention, it is preferable that the composite powder is blended in an amount of 3 to 30% by weight. In the sunscreen cosmetics of the present invention, it is preferable to further contain 0.5 to 7% by weight of a polyoxyalkylene-modified polysiloxane.

In the sunscreen cosmetic of the present invention, the polyoxyalkylene-modified polysiloxane may be one or more selected from the following formulas [1], [2] and [3]. It is suitable.

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Embedded image (However, in the general formulas [1], [2] and [3], R is a methyl group or a partially phenyl group, and R is hydrogen or carbon atom 1)
P is a number of 1 to 5, q is a number of 2 to 3, x, m, and n are average numbers, and the polyoxyalkylene-modified organopolysiloxane has 5 to 40 polyoxyalkylene groups in the molecule. % In which the molecular weight of the polyoxyalkylene-modified organopolysiloxane is 2000 or more. )

Further, in the sunscreen cosmetic of the present invention, a powder which has been surface-treated with one or more selected from fatty acids, fatty acid soaps and fatty acid esters may be used.
It is preferable to mix at least by weight. Further, in the sunscreen cosmetic of the present invention, it is preferable that one or more selected from fatty acids, fatty acid soaps, and fatty acid esters are further blended in an amount of 0.1% by weight or more as a surface treatment agent for the powder. is there.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention relates to a method for producing a fine powder of zinc oxide having a particle size of 0.1 .mu.m or less, which is coated with silicic anhydride at a coverage of 5 to 30% by weight, and further, the surface thereof is subjected to a silicone treatment. The present invention relates to sunscreen cosmetics dispersed with a strong mechanical force using a mill or a high-pressure disperser. As a result, the finely divided zinc oxide is in a state of being finely dispersed, unlike the conventional case,
It is possible to improve the effect of preventing ultraviolet rays.

In addition, since the fine zinc oxide is uniformly coated with silicic anhydride, elution of zinc ions into the system is suppressed, and the generation of metal soap by the reaction with free fatty acids does not occur. Further, even if a strong mechanical force is applied by a medium stirring mill or a high-pressure disperser, the surface treatment agent is peeled off, and the hydrophilic untreated surface is not exposed, so that there is no reaction with water. As a result, the gel does not gel even with the passage of time or temperature, so that the viscosity in the system is always maintained in a stable state, and a sunscreen cosmetic that maintains a comfortable use feeling is obtained.

[0012] That is, the present invention relates to a sunscreen cosmetic in which fine zinc oxide particles are well dispersed, and excellent in stability and ultraviolet ray preventing effect. More specifically, fine particles of zinc oxide are treated with silicic anhydride and silicone, and then highly dispersed with a medium agitating mill or high-pressure disperser, etc., to have an excellent ultraviolet ray prevention effect and a stability that does not react with free fatty acids. It relates to a good sunscreen cosmetic.

[0013]Composite powder  The particulate zinc oxide used in the present invention is generally French
It can be obtained by law or American law. Commercially available average particle size is 0.
Finex-25, Finex-5 for fine zinc oxide of 1μm or less
0, FINEX-75 (manufactured by Sakai Chemical Industry), ZnO350 (Sumitomo)
Osaka Cement Co.), ZINCOX SUPER-10, ZINCOX SUPER
-20R, ZINCOX SUPER-30 (manufactured by Hakusui Chemical Industry), Z-COT
E (manufactured by Sun Smart).

Next, a method for producing the composite powder of the present invention will be described. While maintaining a high dispersion state of the above fine particle zinc oxide in an aqueous solution using a sand grinder mill or the like,
Sodium silicate is added and neutralized to uniformly coat the silicic anhydride. Alternatively, after finely divided zinc oxide is highly dispersed in an organic solvent, silicic anhydride is uniformly coated with alkoxysilane. The present invention does not hinder the present invention as long as it can be manufactured by other manufacturing methods and is finally coated with a certain amount of silicic anhydride.
It is preferable to coat 5 to 30% by weight of silicic anhydride.
Particularly preferred is 10 to 23% by weight. If the amount is less than 5% by weight, it is difficult to uniformly coat around the zinc oxide, and the elution of zinc ions causes deterioration in stability and a decrease in the effect of preventing ultraviolet rays. On the other hand, if the content is more than 30% by weight, the use sensation such as the tingling sensation due to the silicic anhydride is deteriorated. Thereafter, a surface treatment of 3 to 12% by weight is performed with a silicone treating agent using various powder dispersing apparatuses to obtain a target composite powder.

Examples of the silicone treating agent include various silicone oils such as methyl hydrogen polysiloxane, dimethyl polysiloxane and methyl phenyl polysiloxane, methyl trimethoxy silane, ethyl trimethoxy silane, hexyl trimethoxy silane, octyl trimethoxy silane and the like. And various fluoroalkylsilanes such as trifluoromethylethyltrimethoxysilane and heptadecafluorodecyltrimethoxysilane. These can be used alone or in combination of two or more.

The composite powder used in the present invention is preferably incorporated in the sunscreen cosmetic in an amount of 3 to 30% by weight. It is particularly preferable that the blending of 10 to 23% by weight has a good balance between the ultraviolet ray preventing effect, the transparency, and the feeling in use. Conversely 3
If the amount is less than the weight percentage, the effect of preventing ultraviolet rays may not be obtained. If the content is more than 30% by weight, transparency and feeling in use may be extremely deteriorated.

[0017]Polyoxyalkylene-modified polysiloxane  The sunscreen cosmetics of the present invention are polyoxyalkylene modified.
0.5 to 7% by weight of conductive polysiloxane
Can be. If the amount is less than 0.5% by weight, the dispersion of the powder is not good.
May be sufficient, and there may be cohesion
You. On the other hand, if it exceeds 7% by weight, it remains on the skin
Works as oil, sticky, etc. and feels extremely usable
May worsen.

The polyoxyalkylene-modified polysiloxane suitably used in the present invention is represented by the following general formula [1]:
[2] or [3] is mentioned.

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In the general formulas [1], [2] and [3], R is a methyl group or a partially phenyl group, and R is hydrogen or a carbon atom.
P is a number of 1 to 5, q is a number of 2 to 3, x, m, and n are average numbers, and the polyoxyalkylene-modified organopolysiloxane has 5 to 40 polyoxyalkylene groups in the molecule. % In which the molecular weight of the polyoxyalkylene-modified organopolysiloxane is 2000 or more. In the present invention, it is preferable to use at least one kind or two or more kinds of the polyoxyalkylene-modified organopolysiloxane.

[0020]Distributed processing  The medium used to disperse the powder used in the present invention in a wet state.
Stirring mills include batch and continuous bead mills,
Grinder mills, ball mills, etc. are used.
Microfluidizer and Nanomizer as dispersing devices
Are used. Beads, sa
The material of the medium such as glass and alumina is
Konia, titanium, steel, etc. are used.
Konia is preferred. The size is usually a diameter
The one of about 0.3 to 2.0 mm is used.
In particular, those having a thickness of 0.5 to 1.0 mm are preferable. Medium
When dispersing powder with a body stirring mill or high-pressure disperser,
Before using a regular powder mixer such as a homomixer or homogenizer.
Disintegrate the fine particle powder used in the dispersion process to some extent
It is desirable to perform the primary treatment with a disperser having the ability.
It breaks down fine particles in the aggregate state in the primary treatment
By doing so, the medium agitation mill and high pressure
Reduces the load required for disintegration and dispersion by
This is because the fine particle powder can be crushed and dispersed.

Hereinafter, a batch-type medium stirring mill, which is an example of a dispersion apparatus suitably used in the production method of the present invention, will be described. FIG. 1A shows a batch-type medium stirring mill. The medium stirring mill includes a basket portion 10 in a tank 18 and one or more in-tank stirrers 20 attached to the basket portion 10 for both premixing and dispersion fluid flow. The basket section 10 includes a jacket 28 of an upper lid, and the position is fixed by the rod 16. A large number of small holes formed of slits are provided on the side wall of the basket portion 10. The basket unit 10 has an in-basket stirring device 14 for stirring the inside of the basket unit 10.

First, the raw material containing the powder is preliminarily mixed into a mixed liquid by a stirrer 20 in the tank provided, and then the rotating shaft of the stirrer 14 in the basket above the basket unit 10 attached to the device. It flows into the basket part 10 from the surrounding opening.

Here, the inside of the basket section 10 is shown in FIG.
It is shown in (B). The inside of the basket portion 10 is filled with a solid dispersion medium (beads 22), and the stirring device 14 in the basket has a stirring pin disk 26 (or a stirring disk) mounted perpendicular to the rotation axis. . The stirring pin disk 26 has a pin 24 for stirring.

The mixed liquid flowing into the basket portion 10 is crushed and dispersed by the stirring pin disk 26 which rotates at a high speed, where the solid dispersion medium (beads 22) crushes the powder agglomerated particles.
Further, the water flows out of small holes 12 formed on the side wall of the basket portion 10 and formed of a number of slits.

The arrows in FIG. 1A indicate the overall fluid path. The outflowing dispersion liquid is supplied to the tank stirring device 2
0, a part of the fluid flows into the basket portion 10 again through the opening above the basket portion 10 and the tank 1
Circulate in 8. It is important that the agitating portion of the in-tank agitator 20 is located at a position that does not obstruct the fluid path that enters and exits the basket section 10. The medium agitating mill is an apparatus having a process of keeping the dispersion of the powder in the tank 18 uniform in this way. An example of such a dispersion apparatus suitable for the present invention is disclosed in Japanese Patent Publication No. 8-179.
30 dispersing devices.

The basket portion filled with the solid dispersion medium (beads) installed in the medium stirring mill has a large number of small holes made of slits on the side wall, and the size of the solid dispersion medium used is (Beads) are so sized that they do not flow out of the basket, so that the resulting dispersion does not contain beads.

In the medium stirring mill, since small holes are provided in the side wall of the basket portion filled with the beads, the beads are concentrated on the side wall portion by the centrifugal force due to the rotation of the shaft, so that the density of the beads is reduced. Since the powder passes through a high place, the dispersion efficiency can be increased.

As the stirring device having both the premixing and the dispersion flow, a stirring device suitable for ordinary cosmetics production and the like can be used. However, a turbine-type rotor is attached to the tip of a rotating rod. It is particularly preferred to use an attached disper or homogenizer.

[0029]Other powders and their dispersants, surface treatment agents  As a dispersant and a surface treatment agent for the powder used in the present invention
As fatty acids and fatty acid soaps and fatty acid esters
Palmitic acid, isostearic acid, stearic acid, lau
Phosphoric acid, myristic acid, behenic acid, oleic acid, rhodi
Acids, fatty acids such as 12-hydroxystearic acid
Aluminum stearate, calcium stearate, 1
Fatty acid such as aluminum 2-hydroxystearate
Hacken and dextrin fatty acid esters, cholesterol
Fatty acid ester, sucrose fatty acid ester, starch fat
Fatty acid esters and the like, and these may be used alone or in combination of two or more.
The above can be used. As a dispersant or surface treatment agent
0.1% by weight or more is preferable to obtain the effect of
No.

The sunscreen cosmetics of the present invention include titanium oxide, zinc oxide, red iron oxide, yellow iron oxide, black iron oxide, ultramarine,
Cerium oxide, talc, mica, sericite, kaolin, bentonite, clay, silicic acid, silicic anhydride, magnesium silicate, zinc stearate, fluorophlogopite,
Inorganic powders such as synthetic talc, barium sulfate, magnesium sulfate, calcium sulfate, boron nitride, bismuth oxychloride, alumina, zirconium oxide, magnesium oxide, chromium oxide, calamine, magnesium carbonate and composites thereof; silicone powder, silicone elasticity Powder,
Polyurethane powder, cellulose powder, nylon powder, P
Organic powders such as MMA powder, starch, polyethylene powder and composites thereof can be used.
More than one species can be included.

[0031]Other ingredients  As the oily component in the cosmetic of the present invention, liquid paraffin
Quince, squalane, ester oil, diglyceride, tri
Glyceride, perfluoropolyether, petrolatum,
Lanolin, ceresin, carnauba wax, solid paraffin,
Fatty acids, polyhydric alcohols, silicone resins, fluorine trees
Oil, acrylic resin, vinyl pyrrolide, etc.
One or more components are contained as the active ingredient. In the cosmetic of the present invention
Further includes pigments, pH adjusters, preservatives, thickeners,
Preservatives, dispersants, stabilizers, coloring agents, preservatives, antioxidants
Agents, UV absorbers, fragrances, etc., within the scope of the present invention
Can be appropriately blended.

Hereinafter, the present invention will be described in more detail with reference to test examples. First, the present inventors conducted the following tests to study a surface treating agent for fine particle zinc oxide having an ultraviolet ray preventing effect.

[0033]Test Example 1 Surface treatment agent for various surface treatment powders
Peel strength  The present inventors have studied the surface treatment agent peel strength of various surface treatment powders.
Was measured. Surface treatment agent peel strength of surface treatment powder
Is the Soxhlet extraction method using ethyl acetate as a solvent (12
(0 ° C., 3 hours). That is, fine particles
Zinc oxide (specific surface area: about 80m²/ G) with various surface treatments
Soxhlet extraction method
And the results of Test Examples 1-1 to 1-5 were obtained. Conclusion
The results are shown in Table 1.

[0034]

[Table 1]  Surface treatment agent elution amount(%: Treatment agent)  Silicic anhydride + dimethylsilicone (Test Example 1-1) 0.2 Silicic anhydride + methylhydrogenpolysiloxane (Test Example 1-2) 0.2 Dimethylsilicone (Test Example 1-3) 23.0 Methylhydrogen Polysiloxane (Test Example 1-4) 1.5Fatty acid ester (Test Example 1-5) 0.5

From the results shown in Table 1, the composite treated powder of Test Example 1-1 in which fine zinc oxide was coated with silicic acid anhydride and further subjected to a surface treatment with dimethylsilicone showed a small amount of the treatment agent eluted and the surface treatment agent was not used. It turns out that it is hard to peel off. In addition, the composite treated powder of Test Example 1-2 in which the fine particle zinc oxide was coated with silicic anhydride and further subjected to surface treatment with methyl hydrogen polysiloxane has a small amount of the treatment agent eluted and the surface treatment agent is hardly peeled off. . On the other hand, in Test Example 1-3 of the powder treated with dimethyl silicone without being coated with silicic anhydride, it can be seen that the amount of the treatment agent eluted is large and the surface treatment agent is easily peeled off.
Test examples 1-4 and 1- of powders surface-treated with methyl hydrogen polysiloxane or fatty acid ester
No. 5 resulted in a relatively small amount of the treatment agent eluted.

[0036]Test Example 2 Using fatty acids of various surface-treated powders
reaction  Tested in ethanol solvent with 2% by weight of oleic acid dissolved
The fine particle zinc oxide subjected to various surface treatments used in Example 1 was 1
0% by weight, and glass beads were added to the contents by 50%.
After adding 1% by weight, disperse for 1 hour in a paint shaker
In the bead dispersion system of various surface treatment powders and fatty acids,
The reaction state was confirmed, and Test Examples 2-1 to 2-5 were obtained. Table 2
The results are shown.

[0037]

[Table 2] Surface treatment agent Stability (gelation)  Silicic anhydride + dimethyl silicone (Test Example 2-1) No gelation Silicic anhydride + methyl hydrogen polysiloxane (Test Example 2-2) No gelation Dimethyl silicone (Test Example 2-3) Slightly gelled methyl hydrogen Polysiloxane (Test Example 2-4) Slightly gelledFatty acid ester (Test Example 2-5) Gelation

From the results shown in Table 2, it can be seen that the composite powder of Test Example 2-1 in which fine zinc oxide was coated with silicic anhydride and further subjected to surface treatment with dimethyl silicone was excellent in stability without gelation. I understand. Test Example 2 in which fine zinc oxide was coated with silicic anhydride and surface treated with methyl hydrogen polysiloxane
It can be seen that the composite powder of No.-2 has excellent stability without gelling. On the other hand, it can be seen that Test Examples 2-3 to 2-5 in which surface treatment was performed without coating with silicic anhydride were gelled and inferior in stability.

Accordingly, the results of Test Examples 1 and 2 show that the powder treated with silicone and then surface-treated with silicone does not peel off the surface-treating agent and does not react with fatty acids even in a highly dispersed state. Hereinafter, the present inventors have developed a sunscreen cosmetic using the composite powder treated with silicic anhydride and silicone and a medium stirring mill capable of high dispersion.

Next, the present inventors prepared sunscreen cosmetics and confirmed their practical properties. The evaluation of the practical characteristics is as described below. The effect of preventing ultraviolet rays is described in JP-A-7-167.
The in vitro SPF measurement system which can measure SPF value and PFA value with high accuracy described in 781 was used. In addition, regarding the transparency of the preparation, a predetermined amount (2.0 mg / cm ² ) was applied to artificial leather, the color was measured with a CM-1000H (manufactured by Minolta) together with the uncoated part, and the color difference ΔE was calculated (the value of ΔE). Is lower, the transparency is higher). With respect to the stability of the formulation, it was determined with time (50 ° C,
(1 month) was measured after returning the viscosity to 25 ° C., and a change in the state was visually observed. All compounding amounts are shown by weight%.

[0041]Evaluation of practical characteristics  Apply sample to 20 female panels, feel and use
Was evaluated for transparency. <Evaluation> 17 or more respondents are good ◎ 12 to 16 respondents are good ○ 9 to 11 respondents are good △ 5 to 8 respondents are good × 4 or less are good ××

[0042]Test Example 3 Examination of surfactant  We coated the silicic anhydride and treated it with silicone
Investigate a surfactant that disperses fine zinc oxide
went. Polyoxyalkylene-modified polysiloxane
Test Example 3-1 combined with glyceryl monostearic acid
Test Example 3-2, sorbitan distearate
Sunscreen cosmetic (W / O type) of Test Example 3-3 in which
Emulsion composition) based on the composition shown in the table below,
The qualitative evaluation was performed. Preparation is performed with a normal homogenizer
This was performed by dispersing and emulsifying. The results are shown in Table 3.
You.

[0043]

[Table 3]  Test example Test example Test example3-1 3-2 3-3  Cyclomethylpolysiloxane 30 30 30 Dimethyl silicone 5.55 Polyoxyalkylene-modified polysiloxane 4-- (polyoxyalkylene group 20%, average molecular weight 6200) Glyceryl monostearate 4- (polyoxyethylene 25 mol) sorbitan distearin Acid ester --4 Silicone resin 111 Antioxidant Proper amount Proper amount Proper amount Octyl methoxycinnamate 3 33 Monooleic ester 1.5 1.5 1.5 Cation-modified bentonite 22 2 Dimethylsilicone-treated zinc oxide coated fine particles 17 17 17 ( 5% by weight of dimethyl silicone, 10% by weight of silicic anhydride, average particle diameter of fine zinc oxide 0.02 μm) Talc treated with calcium myristate 55 5 PMMA spherical resin powder 55 55 Ion-exchange water to 100 to 100 to 100 Glycerin 44 Polyethylene glycol 1 1 1 Preservative qs qs qs stabilizers qs qs qsFragrance appropriate amount appropriate amount appropriate amount  Feeling of use ◎ △ △ Finish transparency ◎ △ △Stability (1 month) ◎ △ △

As shown in the results in Table 3, Test Example 3-1 using polyoxyalkylene-modified polysiloxane
Is superior to Test Examples 3-2 and 3-3 in which other surfactants are used, so that the dispersion of the powder becomes better, the change with time in the viscosity is less, the stability is excellent, and the feel in use and the finish are transparent. It turns out that it is excellent.

Next, the compositions shown in Table 4 were used to confirm the differences depending on the preparation method. The preparation method was performed by dispersing and emulsifying Test Examples 3-1 and 3-4 using a homogenizer. Test Examples 3-5 and 3-6 were performed by dispersing and emulsifying with a medium stirring mill. Test example 3
-4 and 3-6 are compositions containing no polyoxyalkylene-modified polysiloxane.

[0046]

[Table 4]  Test example Test example Test example Test example3-1 3-4 3-5 3-6  Cyclomethylpolysiloxane 30 30 30 30 Dimethyl silicone 5.55 5 Polyoxyalkylene-modified polysiloxane 4--4- (polyoxyalkylene group 20%, average molecular weight 6200) Triisostearate polyglycerin-5-5 Silicone resin 11 1 11 1 Antioxidant Appropriate amount Appropriate amount Appropriate amount Appropriate amount Octylmethoxycinnamate 3 3 3 3 Monooleate 1.5 1.5 1.5 1.5 Cation-modified bentonite 2 2 2 2 Dimethyl silicone Treated silicic acid anhydride-coated fine particle zinc oxide 17 17 17 17 %, Silicic acid anhydride 10% by weight, fine zinc oxide average particle diameter 0.02 μm) Calcium myristate-treated talc 5.55 5 PMMA spherical resin powder 5 5 5 5 ion-exchanged water to 100 to 100 to 100 to 100 glycerin 4 4 4 4 Polyethylene glycol 1 1 1 Preservative qs qs qs qs stabilizers qs qs qs qsFragrance appropriate amount appropriate amount appropriate amount appropriate amount  Feeling in use ◎ △ ◎ ○ Transparency of finish ◎ △ ◎ ○Stability (1 month) ◎ △ ◎ ○

From the results in Table 4, it can be seen that even when no polyoxyalkylene-modified polysiloxane is used, an excellent sunscreen cosmetic can be obtained by preparation with a medium stirring mill.

[0048]Test Example 4 Polyoxyalkylene-modified poly
Types of siloxane  Next, the present inventors investigated the polyoxyalkylene-modified polysiloxane.
The type of sun was examined. Identification suitable for the present invention
Of polyoxyalkylene-modified polysiloxane
Test Example 4-1, polyoxyalkylene-modified polysiloxa
Test Example 4- in which the proportion of polyoxyalkylene groups in
2. Average content of polyoxyalkylene-modified polysiloxane
Sunscreen cosmetics (W / O type) of Test Example 4-3 having a low particle size
Emulsion composition) based on the composition shown in the table below,
And evaluation. Preparation is performed using a standard homogenizer.
It was performed by sprinkling and emulsifying. Table 5 shows the results.

[0049]

[Table 5]  Test example Test example Test example4-1 4-2 4-3  Cyclomethylpolysiloxane 30 30 30 Dimethyl silicone 22 2 Polyoxyalkylene-modified polysiloxane 5-- (polyoxyalkylene group 20%, average molecular weight 6200) Polyoxyalkylene-modified polysiloxane-5- (polyoxyalkylene group 5%, Average molecular weight 3000) polyoxyalkylene-modified polysiloxane -5 (polyoxyalkylene group 15%, average molecular weight 500) silicone resin 111 antioxidant appropriate amount appropriate amount appropriate amount octyl methoxycinnamate 33 33 4-tertbutyl-4 ' -Methoxybenzoylmethane 1 11 1 Isostearic acid 1 1 1 1 Silicone treated barium sulfate 3 3 3 Cationic modified bentonite 2 2 2 Dimethylsilicone treated Silica anhydride coated fine particles zinc oxide 18 18 18 (Dimethyl silicone 3% by weight, silicic anhydride 22% by weight , Zinc oxide particles a mean particle size 0.025 .mu.m) Talc 5 5 5 PMMA spherical resin powder 5 5 5 Ion-exchanged water to 100 to 100 to 100 Glycerin 4 4 4 Polyethylene glycol 1 1 1 Preservative qs qs qs stabilizers qs qs qsFragrance appropriate amount appropriate amount appropriate amount  Feeling of use ◎ ○ ○ Transparency of finish ◎ △ △Stability (1 month) ◎ × ×

As shown in the results in Table 5, Test Example 4 using a specific polyoxyalkylene-modified polysiloxane
A value of -1 indicates that the finish is excellent in transparency and the use feeling is good. Moreover, it turns out that the sunscreen cosmetics of the test example 4-1 of this invention have little change with time of a viscosity, and are also excellent in stability. Therefore, Test Examples 4-2 and 4-3
This shows that poor dispersion and poor emulsion stability are caused by the polyoxylene group and molecular weight of the polyoxyalkylene-modified polysiloxane.

Next, the difference in the preparation method was confirmed by the compositions shown in Table 6. The preparation method was performed by dispersing and emulsifying Test Examples 4-1 and 4-4 using a homogenizer. Test Examples 4-5 and 4-6 were performed by dispersing and emulsifying with a medium stirring mill. Test example 4
-4 and 4-6 are compositions containing no polyoxyalkylene-modified polysiloxane.

[0052]

[Table 6]  Test example Test example Test example Test example4-1 4-4 4-5 4-6  Cyclomethyl polysiloxane 30 30 30 30 Dimethyl silicone 22 22 Polyoxyalkylene-modified polysiloxane 5-5- (polyoxyalkylene group 20%, average molecular weight 6200) Polyglyceryl triisostearate-5-5 Silicone resin 11 1 11 Antioxidant Appropriate amount Appropriate amount Appropriate amount Appropriate amount Octylmethoxycinnamate 3 3 3 3 4-tertbutyl-4'-methoxybenzoylmethane 1 1 1 1 1 Isostearic acid 1 1 1 1 Silicone-treated barium sulfate 3 3 3 3 Cation-modified bentonite 2 2 2 2 dimethylsilicone-treated silicic anhydride-coated fine particle zinc oxide 18 18 18 18 (3% by weight of dimethylsilicone, 22% by weight of silicic anhydride, average particle size of fine zinc oxide 0.025 μm) Talc 5 5 5 5 PMMA spherical resin powder 5 5 5 5 Deionized water to 100 to 100 to 100 to 100 Glycerin 4 4 4 4 Polyethylene glycol 1 1 1 1 Preservative Proper amount Proper amount Proper amount Proper amount Stabilizer Proper amount Proper amount Proper amount Proper amountFragrance appropriate amount appropriate amount appropriate amount appropriate amount  Feeling in use ◎ △ ◎ ○ Transparency of finish ◎ △ ◎ ○Stability (1 month) ◎ △ ◎ ○

From the results shown in Table 6, it can be seen that even when no polyoxyalkylene-modified polysiloxane is used, an excellent sunscreen cosmetic can be obtained by preparation with a medium stirring mill.

[0054]Test Example 5 Composite Powder of Fine Zinc Oxide
Compounding amount  Next, silica oxide is coated on the fine zinc oxide, and the silicone
The mixing amount of the surface-treated composite powder was examined. Test example
Of the composition of 3-1, silica oxide is coated on the fine zinc oxide.
The compounding amount of the overcoated silicone surface-treated composite powder changes.
A sunscreen cosmetic having the composition shown in Table 7 was prepared,
About stopping effect, feeling of use, transparency and stability of finish
An evaluation was performed. Disperse and emulsify with a homogenizer
It was done by The tests and evaluations are as described above.
However, the UV protection effect is evaluated according to the following criteria.
Wanted.

<Ultraviolet ray prevention effect> A composition was prepared in which fine particles of zinc oxide were coated with silicic anhydride and did not contain a composite powder which had been subjected to a silicone surface treatment.
The PF value and the in vitro PFA value were compared. The evaluation criteria are as follows. ◎… In vitro SPF value is 8 or more, in vitro PFA value is 5
○… In vitro SPF value was 4 or more and less than 8, in vitro PFA
An increase of 2 to less than 5 was observed △ ... In vitro SPF value of 1 to less than 4, in vitro PFA
A value of 1 or more and less than 2 was observed. ×… No increase in in vitro SPF value or in vitro PFA value was observed.

[0056]

[Table 7]  Test example Test example Test example Test example5-1 5-2 5-3 5-4  Cyclomethylpolysiloxane 30 30 30 30 Dimethyl silicone 5 5 5 5 Polyoxyalkylene-modified polysiloxane 4 4 4 4 (polyoxyalkylene group 20%, average molecular weight 6200) Silicone resin 11 1 1 Antioxidant proper amount proper amount proper amount octyl Methoxy cinnamate 3 3 3 3 Mono oleate 1.5 1.5 1.5 1.5 Cation-modified bentonite 2 2 2 2 Dimethyl silicone Treated silicic acid-coated fine particle zinc oxide 3 10 23 30 (Dimethyl silicone 5% by weight, Silicic anhydride 10% by weight, Fine particle zinc oxide average particle diameter 0.02 μm) Calcium myristate treated talc 5 5 5 5 PMMA spherical resin powder 5 5 5 5 ion exchange water to 100 to 100 to 100 to 100 glycerin 4 4 4 4 polyethylene glycol 1 1 1 1 preservative Appropriate amount Appropriate amount Appropriate amount Appropriate amount Stabilizer Appropriate amount Appropriate amount Appropriate amount Appropriate amountFragrance appropriate amount appropriate amount appropriate amount appropriate amount  UV protection effect △ ○ ◎ ◎ Feeling of use ◎ ◎ ○ △ Transparency of finish ◎ ◎ ○ △Stability (1 month) ◎ ◎ ◎ ○ 

From the results shown in Table 7, it is understood that the compounding amount of the fine zinc oxide composite powder coated with silicic anhydride and surface-treated with silicone in the present invention is preferably 3 to 30% by weight.

[0058]Test Example 6 Polyoxyalkylene-modified poly
Siloxane content  Next, the amount of polyoxyalkylene-modified polysiloxane
Was considered. Sunscreen cosmetics with the composition shown in the table below
Prepared, UV protection effect, use feel, finish transparency
And stability were evaluated. Preparation is normal homogena
This was performed by dispersing and emulsifying with an Iser. test
The method and evaluation criteria are as described above. Table 8 shows the results.
You.

[0059]

[Table 8]  Test example Test example Test example6-1 6-2 6-3  Cyclomethylpolysiloxane 38 38 38 Dimethyl silicone 33 33 Octyl methoxycinnamate 55 55 Polyoxyalkylene-modified polysiloxane 0.537 (polyoxyalkylene group 15%, average molecular weight 6000) Silicone resin 2 2 2 Bentonite 1 1 1 Anti- Oxidizer Appropriate amount Appropriate amount Appropriate amount Dimethylsilicone-treated silicic acid anhydride-coated fine particle zinc oxide 4 Nylon powder 5 5 5 Ion exchange water to 100 to 100 to 100 Glycerin 5.5 5 Dipropylene glycol 5 5 5 Preservatives Appropriate amount Appropriate amount Stabilizer Appropriate amount Appropriate amount Appropriate amountFragrance appropriate amount appropriate amount appropriate amount  UV protection effect ○ ◎ ◎ Feeling of use ◎ ◎ ○ Finish transparency ○ ◎ ◎Stability (1 month) ○ ◎ ◎

From the results shown in Table 8, the compounding amount of the polyoxyalkylene-modified polysiloxane according to the present invention is 0.5 to 7%.
It turns out that it is used suitably by weight%.

[0061]

The present invention will be further described below with reference to Examples and Comparative Examples.
Will be described. All amounts are by weight.Example 1 Water-in-oil emulsion composition  In Table 9, a water-in-oil emulsion composition was prepared as Example 1.
Mix the oil phase component and powder component in the following formulation and mix
After disintegrating and dispersing the powder in a stirring mill, add the aqueous phase component and emulsify
did. In Comparative Example 1-1, the same formulation was used in a normal manufacturing process.
Manufactured by dispersing and emulsifying with a modifier. Comparative Example 1
2, 1-3 use different surface-treated zinc oxide,
It was manufactured in a process using a stirring mill.

[0062]

[Table 9]  Example Comparative example Comparative example Comparative example1 1-1 1-2 1-3  Cyclomethylpolysiloxane 30 30 30 30 Dimethyl silicone 33 33 33 Glyceryl tri-2-ethylhexanoate 55 55 Polyoxyalkylene-modified polysiloxane 33 33 (polyoxyalkylene group 15%, average molecular weight 6000) sesquiisostearic acid Sorbitan 1 1 1 1 1 1 Isostearic acid 1 1 1 1 1 Bentonite 1 1 1 1 1 Antioxidant proper amount proper amount proper amount proper amount proper amount permethylsilicone treated zinc oxide coated with anhydrous silicic acid 15 15-- Fine particle zinc oxide average particle diameter 0.03 μm) Dimethyl silicone treated fine particle zinc oxide − − 15 − (7% by weight of dimethyl silicone, fine particle zinc oxide average particle diameter 0.03 μm) Myristic acid treated fine particle zinc oxide − − − 15 (Myristic acid 12 weight %, Fine zinc oxide average particles 0.03 μm in diameter) Fine particles of aluminum stearate-treated titanium oxide 55 55 55 Nylon powder 55 55 ion-exchanged water to 100 to 100 to 100 to 100 glycerin 55 55 55 dipropylene glycol 55 55 55 Preservative proper amount proper amount proper amount Stabilizer Appropriate amount Appropriate amount Appropriate amount Appropriate amountFragrance appropriate amount appropriate amount appropriate amount appropriate amount  in vitro SPF value 41.5 35.8 29.7 31.2 in vitro SPA value 11.2 9.8 7.4 7.8 Transparency (ΔE) 4.2 4.9 6.8 7.6 Use feeling ◎ ○ △ ○ Finished transparency ◎ ○ △ △ Viscosity (50 ° C) Initial value 18000 14500 16000 13800 1 month 16800 13200 17000 45000Stability (1 month) ◎ ◎ ○ ×

From the results shown in Table 9, it is found that Comparative Examples 1-2 and 1-3 in which the fine particle zinc oxide not coated with silicic acid anhydride was blended were inferior in stability of viscosity, in use feeling and in transparency of finish. Understand. On the other hand, in Example 1 in which fine particle zinc oxide which had been subjected to a silica anhydride coating treatment and further subjected to a silicone treatment was blended, the viscosity stability was excellent, and the use feeling and the finish transparency were also excellent. Understand. further,
Example 1 shows transparency (ΔE), in vitro SPF value, in vit
Excellent results were also obtained for the ro SPA value. Also,
Comparing Example 1 with Comparative Example 1-1, Example 1 prepared with a medium agitating mill is more improved in ultraviolet ray prevention effect, use feeling, and transparency than Comparative Example 1-1 prepared with a normal homogenizer. You can see that it is.

[0064]Example 2 Water-in-oil emulsion composition  In Table 10, a water-in-oil emulsion composition was prepared as Example 2.
Was. Mix the oil phase component and powder component in the following formulation,
After pulverizing and dispersing the powder in a body stirring mill, add the aqueous phase component
Emulsified. Comparative Example 2-1 uses the same formulation in a normal manufacturing process.
It was dispersed and emulsified by a certain homogenizer. Comparative Example 2-
2 and 3 use different surface-treated zinc oxide
It was manufactured by a process using a metal.

[0065]

[Table 10]  Example Comparative example Comparative example Comparative example2 2-1 2-2 2-3  Cyclomethylpolysiloxane 30 30 30 30 Dimethyl silicone 33 33 33 Polyoxyalkylene-modified polysiloxane 33 33 (polyoxyalkylene group 20%, average molecular weight 6200) Silicone resin 222 2 Antioxidant proper amount proper amount proper amount octyl Methoxycinnamate 1 11 1 4-tert-butyl-4-methoxybenzoylmethane 1 1 1 1 1 1 Isostearic acid 1 1 1 Cation-modified bentonite 1 1 1 1 Methyl hydroxypropylpolysiloxane treated zinc oxide coated zinc oxide 18 18-- (3% by weight of methylhydroxypolysiloxane, 22% by weight of silicic anhydride, average particle diameter of fine zinc oxide 0.025 μm) Methylhydrogenpolysiloxane treated fine particle zinc oxide-18-(7% by weight of methylhydrogenpolysiloxane, Fine particle zinc oxide average particle diameter 0.03 μm) Myristic acid-treated fine particle zinc oxide −−− 18 (12% by weight of myristic acid, fine particle zinc oxide average particle diameter 0.03 μm) Calcium myristate-treated talc 5 5 5 5 PMMA spherical resin powder 5 5 5 5 Ion-exchanged water to 100 to 100 to 100 to 100 Glycerin 4 4 4 4 Polyethylene glycol 1 1 1 1 Preservative proper amount proper amount proper amount proper amount Stabilizer proper amount proper amount proper amount proper amountFragrance appropriate amount appropriate amount appropriate amount appropriate amount  in vitro SPF value 42.5 37.4 34.4 35.2 In vitro SPA value 9.2 8.1 7.2 7.8 Transparency (ΔE) 1.6 2.2 4.6 4.9 Feeling of use ◎ ○ ○ ○ Transparency of finish ◎ ○ △ △ Viscosity (50 ° C) Initial value 5800 4800 4500 4700 1 month 5500 4900 5400 6300Stability (1 month) ◎ ◎ △ ×

From the results shown in Table 10, it can be seen that Comparative Examples 2-2 and 2-3 in which fine particle zinc oxide not coated with silicic anhydride was blended were inferior in viscosity stability and inferior in transparency. On the other hand, Example 2 in which fine particle zinc oxide which had been treated with silica anhydride and further subjected to silicone treatment was blended was excellent in stability of viscosity, in use feeling and in transparency of finish. Understand. Example 2
Showed particularly excellent results in terms of transparency (ΔE), in vitro SPF value, and in vitro SPA value. Example 2
Comparison between Comparative Example 2-1 and Comparative Example 2-1 shows that Example 2 prepared with a medium stirring mill has improved UV protection effect, use feeling, and transparency over Comparative Example 2-1 prepared with a normal homogenizer. I understand.

[0067]Example 3 Oily composition  In Table 11, an oily composition was produced as Example 3. below
Mix all components except the aqueous phase component in the formulation, and mix
The powder was disintegrated and dispersed in the above to obtain Example 3. Comparative Example 3
1 is the same formulation with a homogenizer that is usually a manufacturing process
Manufactured by dispersion. Comparative Examples 3-2 and 3 have different surface treatments.
Manufactured in a process using a medium stirring mill using zinc oxide
Was.

[0068]

[Table 11]  Example Comparative example Comparative example Comparative example3 3-1 3-2 3-3  Cyclomethyl polysiloxane to 100 to 100 to 100 to 100 Dimethyl silicone 55 55 alcohol 8 88 88 Polyoxyalkylene-modified polysiloxane 33 33 (polyoxyalkylene group 20%, average molecular weight 6200) Sorbitan sesquiisostearate 1 11 1 Silicone resin 8 8 8 8 Antioxidant proper amount proper amount proper amount proper amount octyl methoxycinnamate 3 33 3 cation-modified bentonite 0.5 0.5 0.5 0.5 dimethyl silicone treated zinc oxide coated with silicic anhydride 12 12--(5% by weight of dimethyl silicone) 10% by weight of silicic anhydride, average particle diameter of fine zinc oxide 0.02 μm) Fine particle zinc oxide treated with dimethyl silicone − − 12 − (7% by weight of dimethyl silicone, average particle diameter of fine particle zinc oxide 0.03 μm) Fine particle of zinc oxide treated with myristic acid − − − 12 (Myristi Acid 12% by weight, fine particle zinc oxide average particle diameter 0.03 μm) fine particle titanium oxide treated with aluminum stearate 33 33 33 PMMA spherical resin powder 55 55 silicone treated talc 15 15 15 15Fragrance appropriate amount appropriate amount appropriate amount appropriate amount  in vitro SPF value 42.5 37.4 34.4 35.2 in vitro SPA value 9.2 8.1 7.2 7.8 Transparency (ΔE) 1.6 2.2 4.6 4.9 Feeling of use ◎ ○ ○ △ Transparency of finish ◎ ○ ○ △ Viscosity (50 ° C) Initial value 3800 2500 2900 3200 1 month 3400 2800 2350 6900Stability (1 month) ◎ ◎ ○ ×

From the results shown in Table 11, it can be seen that Comparative Example 3-2 in which fine particle zinc oxide not coated with silicic acid anhydride was blended was inferior in stability of viscosity, in use feeling and in transparency of finish. On the other hand, Example 3 in which fine silica particles treated with silicic acid anhydride and further subjected to silicone treatment are blended has excellent viscosity stability, excellent use feeling, and excellent finish transparency. Understand. Further, Example 3 shows that transparency (ΔE), in vitro SPF value, in vitro SPA
Particularly excellent results were obtained also in the values. In addition, comparing Example 3 with Comparative Example 3-1, Example 3 prepared with a medium agitating mill is more effective in preventing ultraviolet rays, feeling in use, and transparency than Comparative Example 3-1 prepared with a normal homogenizer. It can be seen that it has improved.

Hereinafter, examples of the present invention will be further described.Example 4 Powdery foundation (water can be used)  1. Silicone-treated sericite 18 Silicone-treated mica to 100 Silicone-treated talc 15 Dimethylsilicone-treated anhydrous silicate-coated zinc oxide 6 Silicone-treated titanium oxide 8 Aluminum stearate-treated fine particle titanium oxide 6 Silicone-treated bengara 1.2 Silicone-treated iron oxide yellow 5 Silicone-treated black iron oxide 0.9 Polyurethane powder 6 Paraben proper amount Dimethylpolysiloxane 4 Methylphenylpolysiloxane 3 Octylmethoxycinnamate 3 Polyoxyalkylene-modified polysiloxane (polyoxyalkylene group 15%, average molecular weight 6000) 2 Antioxidant Appropriate amount Perfume Appropriate amount [Production method] Oil phase component, powder component, etc.
Mix, pulverize and disperse the powder with a medium stirring mill, powder
I got the Lee Foundation.

[0071]Example 5 Face powder (white powder)  Talc to 100 Mica 25 Zinc oxide coated with dimethylsilicic acid-treated silicic anhydride 5 Fine particle titanium oxide 3 Spherical silicone powder 8 Vaseline 1 Methylphenyl polysiloxane 3 Ester oil 1 Polyoxyalkylene-modified polysiloxane (polyoxyalkylene group 15%, average molecular weight 6200 0.5) Paraben suitable amount antioxidant proper amount perfume proper amount [Production method] Mix all the ingredients in the above formulation and mix in a medium stirring mill.
The powder was crushed and dispersed to obtain a face powder.

[0072]Example 6 Emulsion Cream Foundation  Talc 14 sericite 10 bengara 0.3 iron oxide yellow 1.2 black iron oxide 0.6 spherical polyethylene powder 6 zinc oxide coated with dimethylsilicone anhydride 3 dimethylpolysiloxane (0.006 Pa · s) 10 olive oil 10 stearic acid 2 polyoxyalkylene-modified polysiloxane (polyoxyalkylene group 15%, average molecular weight 6000) 0.5 glyceryl monostearate 2 POE (40) sorbitan monostearate 2 glycerin 5 triethanolamine 0.8 pH adjuster appropriate amount preservative Appropriate amount Ion exchange water to 100 [Production method] Mix oil phase component and powder component in the above formulation
After crushing and dispersing the powder in a medium stirring mill,
It was added and emulsified to obtain an emulsified cream foundation.

[0073]Example 7 Emulsified Liquid Foundation (W / O)  Silicone-treated mica 14 Silicone-treated sericite 11 Dimethylsilicone-treated silica oxide-coated zinc oxide 8 Spherical PMMA powder 4 Cyclomethylpolysiloxane to 100 Dimethylpolysiloxane 4 Squalane 3 Polyoxyalkylene-modified polysiloxane (polyoxyalkylene group 20%, average (Molecular weight 6000) 2 Sorbitan sesquiisostearate 1 Dispersing aid Suitable amount Dipropylene glycol 2 Deionized water 20 Antioxidant Suitable amount Perfume Suitable amount [Production method] Mix the oil phase component and powder component in the above formulation
After crushing and dispersing the powder in a medium stirring mill,
Add emulsified and emulsified liquid foundation (W /
O) was obtained.

[0074]

As described above, the sunscreen cosmetic according to the present invention is obtained by coating a composite powder of fine zinc oxide coated with silicic anhydride and surface-treated with silicone with a medium stirring mill or a high-pressure disperser. Alternatively, since the dispersion treatment is carried out in water, the surface treatment agent does not peel off and the stability in the system is not impaired. And it can be set as the sunscreen cosmetics excellent also in the ultraviolet ray prevention effect of SPF value and PFA value, and the transparency of finish. Further, by further blending a polyoxyalkylene-modified polysiloxane, the stability in the system can be further improved. In addition, the sunscreen cosmetic of the present invention does not impair the stability of the system even if 1% by weight or more of the powder surface-treated with a fatty acid, a fatty acid soap or a fatty acid ester is blended.

[Brief description of the drawings]

FIG. 1 is a view showing an example of a medium stirring mill used for preparing the sunscreen cosmetics of the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 10 Basket part (medium mill part) 12 Small hole which consists of a slit 14 Stirring device in a basket 16 Rod 18 Tank 20 Stirring device (disper) in a tank which has both premixing and dispersion liquid flow 22 Beads 24 Pin 26 Stirring pin Disc 28 Jacket

 ──────────────────────────────────────────────────続 き Continuing from the front page (72) Inventor Kyoko Shiroichi 1050 Nippa-cho, Kohoku-ku, Yokohama, Kanagawa Prefecture F-term in Shiseido Daiichi Research Center Co., Ltd. 4C083 AA122 AB211 AB232 AB242 AB432 AB442 AC012 AC022 AC122 AC241 AC242 AC342 AC351 AC352 AC422 AC442 AC472 AC482 AC542 AD042 AD072 AD092 AD112 AD152 AD161 AD162 BB25 BB47 CC12 CC19 DD32 EE01 FF05

Claims (7)

[Claims] 1. A sunscreen cosmetic comprising a composite powder of particulate zinc oxide coated with silicic anhydride and further surface-treated with silicone, dispersed in oil or water with a medium stirring mill or a high-pressure disperser. . 2. The cosmetic according to claim 1, wherein the composite powder of fine zinc oxide coated with silicic anhydride and further surface-treated with silicone is coated with fine silica of 0.1 μm or less with silicic anhydride. A sunscreen cosmetic, which is a powder coated with 5 to 30% by weight and further surface-treated with 3 to 12% by weight of silicone. 3. The cosmetic according to claim 1, further comprising 3 to 30% by weight of a composite powder of fine zinc oxide coated with silicic anhydride and surface-treated with silicone. Sunscreen cosmetics. 4. The cosmetic according to claim 1, wherein
Further, the polyoxyalkylene-modified polysiloxane was added to 0.1 g.
A sunscreen cosmetic comprising 5 to 7% by weight. 5. The cosmetic according to claim 4, wherein the polyoxyalkylene-modified polysiloxane is one or more selected from the following formulas [1], [2] and [3]. And sunscreen cosmetics. Embedded image Embedded image Embedded image (However, in the general formulas [1], [2], and [3], R is a methyl group or a partly phenyl group, and R is a hydrogen number or a carbon number of 1 to 1.)
12 alkyl groups, p is an integer of 1 to 5, q is an integer of 2 to 3, x, m, and n are average numbers, and the polyoxyalkylene-modified organopolysiloxane has a polyoxyalkylene group in a molecule of 5 to 40% by weight. % And an integer such that the molecular weight of the polyoxyalkylene-modified organopolysiloxane becomes 2000 or more. ) 6. The cosmetic according to claim 1, further comprising 1% by weight or more of a powder surface-treated with one or more selected from fatty acids, fatty acid soaps and fatty acid esters. A sunscreen cosmetic characterized by the following. 7. The cosmetic according to claim 1, wherein one or more selected from fatty acids, fatty acid soaps and fatty acid esters as a dispersant for the powder is 0.1% by weight. A sunscreen cosmetic characterized by being blended as described above.