JP2001058934A - Antisuntan cosmetic - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain an antisuntan cosmetic, good in dispersion and excellent in ultraviolet preventing effects, transparency of finish and stability in the system by formulating a complex powder prepared by carrying out a specific treatment of a particulate zinc oxide with a polyoxyalkylene-modified polysiloxane. SOLUTION: This antisuntan cosmetic is obtained by including (A) a complex powder prepared by coating a particulate zinc oxide having <=0.1 μm size with silicic acid anhydride at 5-30 wt.% coverage and carrying out a surface treatment of the coated zinc oxide with 3-12 wt.% of a silicone and (B) one or more kinds selected from polyoxyalkylene-modified polysiloxanes represented by formulae I to III (R is methyl or the like; R' is H or a 1-12C alkyl; p is 1-5; q is 2-3; x, m and n are each an average number and a numerical value so that the polyoxyalkylene-modified organopolysiloxanes are contained in an amount of 5-40 wt.% in the molecule and the molecular weight thereof is >=2,000). The ingredient A is preferably contained in an amount of 3-30 wt.% and the ingredient B is preferably contained in an amount of 0.5-7 wt.%.

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 an effect of preventing ultraviolet rays.

[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 zinc oxide particles, and as expected, the effect of preventing ultraviolet rays does not increase.
Furthermore, it has a drawback that the gelation occurs by easily reacting with the free fatty acid in the system, and the stability is remarkably deteriorated with time. That is, the present invention provides a sunscreen cosmetic which has a good dispersion of fine-particle zinc oxide, an excellent effect of preventing ultraviolet rays such as SPF value and PFA value, and excellent transparency of finish or stability in the system.

[0004]

Means for Solving the Problems The present inventors have developed a composite powder obtained by subjecting a fine powder of zinc oxide to a surface treatment of silicic anhydride in a state close to primary particles and then carrying out a silicone treatment, thereby obtaining a polyoxyalkylene-modified polysiloxane. It is easy to disperse easily by using the sunscreen cosmetics SPF (SUN PROTEC
TION FACTOR) and PFA (PROTECTION FACTOR OF UV)
A) was found to improve efficiently. In addition, there is no reaction with free fatty acids in the system due to fatty acids or fatty acid soaps used as powder dispersing agents or surface treatment agents (gelation reaction due to the generation of metal soaps), and the viscosity in the system is always reduced. They also found that they maintained a stable state and maintained a comfortable use feel.

That is, the sunscreen cosmetics of the present invention
A composite powder obtained by coating fine particles of zinc oxide having a particle size of 0.1 μm or less with silicic anhydride at a coverage of 5% by weight or more and 30% by weight and further subjecting silicone to a surface treatment of 3% by weight or more and 12% by weight or less; 1] 1 selected from the polyoxyalkylene-modified polysiloxanes shown in [2] or [3]
It is characterized by blending with a seed or two or more kinds.

[0006]

Embedded image

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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, R is hydrogen or a carbon atom having 1 to 1 carbon atoms.
2 is an alkyl group, p is a number of 1 to 5, q is a number of 2 to 3,
x, m, and n are average numbers such that the polyoxyalkylene-modified organopolysiloxane contains 5 to 40% by weight of a polyoxyalkylene group in the molecule and the molecular weight of the polyoxyalkylene-modified organopolysiloxane becomes 2000 or more. Indicates a numerical value. )

Further, in the sunscreen cosmetic of the present invention, a composite powder of fine zinc oxide treated with silicic anhydride and silicone is blended in an amount of 3% by weight to 30% by weight, and the polyoxyalkylene-modified polysiloxane is added in an amount of 0 to 30% by weight. 0.5% by weight
It is preferable that the content is not less than 7% by weight. Further, in the sunscreen cosmetic of the present invention, a fatty acid, a fatty acid soap and a fatty acid ester are further blended in an amount of 0.1% by weight or more, and a powder surface-treated with the fatty acid, the fatty acid soap and the fatty acid ester is further blended in an amount of 1% by weight or more. Is preferred.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention relates to a method of coating fine particles of zinc oxide having a particle size of 0.1 μm or less with silicic anhydride at a coverage of 5% by weight or more and 30% by weight.
By combining the composite powder coated below with a polyoxyalkylene-modified polysiloxane that has been subjected to a silicone treatment on its surface, the particulate zinc oxide is in a state of higher dispersion than ever before, and the UV protection effect is improved. It is a sunscreen cosmetic characterized by doing.

In addition, since the fine zinc oxide is uniformly coated with silicic anhydride, elution of zinc ions into the system is suppressed, and generation of metal soap by reaction with free fatty acids does not occur. As a result, the composition 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 the sunscreen cosmetic is characterized by maintaining a comfortable use feeling.

That is, the present invention relates to a sunscreen cosmetic having a good dispersion of fine zinc oxide and excellent stability and ultraviolet ray preventing effect. More specifically, the present invention relates to a fine zinc oxide treated with silicic anhydride and silicone. The present invention relates to a sunscreen cosmetic which is easily dispersed with a polyoxyalkylene-modified polysiloxane so as to have an excellent effect of preventing ultraviolet rays and has good stability not to react with free fatty acids.

The particulate zinc oxide used in the present invention is generally obtained by a French method or an American method. As a commercially available fine particle zinc oxide having an average particle diameter of 0.1 μm or less, FINEX-2
5, FINEX-50, FINEX-75 (made by Sakai Chemical Industry Co., Ltd.), ZnO3
50 (Sumitomo Osaka Cement), ZINCOX SUPER-10, ZI
NCOX SUPER-20R, ZINCOX SUPER-30 (manufactured by Hakusui Chemical), Z-COTE (manufactured by Sun Smart) and the like.

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 will not be hindered as long as it can be produced by other production methods and is finally coated with a certain amount of silicic anhydride. It is preferable to coat the silica with 5% by weight or more and 30% by weight or less. In particular, it is particularly preferably from 10% by weight to 23% by weight. If the content is less than 5% by weight, it is difficult to uniformly coat around the zinc oxide, and the elution of zinc ions leads to deterioration in stability and a decrease in the effect of preventing ultraviolet rays. Further, when the content is 30% by weight or more, the use sensation such as the tingling sensation due to the silicic anhydride is deteriorated. Thereafter, the silicone is subjected to a treatment of 3% by weight or more and 12% by weight or less using various kinds of powder dispersing apparatuses to obtain a target composite powder.

Examples of the silicone treating agent used in the present invention include various silicone oils such as methyl hydrogen polysiloxane, dimethyl polysiloxane and methyl phenyl polysiloxane, methyltrimethoxysilane, ethyltrimethoxysilane, hexyltrimethoxysilane, Various alkylsilanes such as octyltrimethoxysilane, trifluoromethylethyltrimethoxysilane, various fluoroalkylsilanes such as heptadecafluorodecyltrimethoxysilane and the like, and these can be used alone or in combination of two or more. Can be used.

The composite powder used in the present invention is blended in the sunscreen cosmetic at 3% by weight or more, preferably at 30% by weight or less. Particularly preferred is 10% by weight or more, and 23% by weight or less has a good balance between the ultraviolet ray preventing effect and the transparency and feel when used. Conversely, if the amount is less than 3% by weight, the effect of preventing ultraviolet rays cannot be obtained.

The polyoxyalkylene-modified polysiloxane used in the present invention includes the following general formulas [1] and [2].
Or [3].

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Embedded image

Embedded image In the general formulas [1], [2] and [3], R is a methyl group or a partially phenyl group, R is hydrogen or an alkyl group having 1 to 12 carbon atoms, p is a number of 1 to 5, and q is 2 to 3 The numbers x, m, and n are the average numbers of the polyoxyalkylene-modified organopolysiloxane containing 5 to 40% by weight of a polyoxyalkylene group in the molecule and the molecular weight of the polyoxyalkylene-modified organopolysiloxane is 2,000 or more. Represents a numerical value such as The present invention is characterized in that at least one or more of the polyoxyalkylene-modified organopolysiloxanes are blended.

The polyoxyalkylene-modified polysiloxane used in the present invention is added to the sunscreen cosmetic in an amount of 0.5% by weight.
More than 7% by weight can be used. 0.5
If the amount is less than the weight percentage, the dispersion of the powder may be insufficient, and cohesion or the like may be observed. On the other hand, if the content exceeds 7% by weight, it acts as a residual oil component on the skin, stickiness and the like are observed, and the feeling of use becomes extremely poor.

Fatty acids and fatty acid soaps as dispersants and surface treating agents for the powder used in the present invention, and palmitic acid, isostearic acid, stearic acid, lauric acid, myristic acid, behenic acid, oleic acid, rosin as fatty acid esters Acid, fatty acid such as 12-hydroxystearic acid and aluminum stearate, calcium stearate, fatty acid soap and dextrin fatty acid ester such as aluminum 12-hydroxystearate,
Cholesterol fatty acid esters, sucrose fatty acid esters, starch fatty acid esters and the like can be mentioned, and these can be used alone or in combination of two or more. In order to obtain the effect as a dispersant, the content is preferably 0.1% by weight or more.

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.
Contains more than species. These powders are preferably surface-treated with the above-mentioned fatty acids, fatty acid soaps and fatty acid esters, and a blending amount of 1% by weight or more is preferable because the sunscreen effect is enhanced. When this powder is blended, it is preferable to blend the fatty acid, the fatty acid soap and the fatty acid ester from the viewpoint of the ultraviolet ray preventing effect and the stability in the system.

The oily components in the cosmetic of the present invention include liquid paraffin, squalane, ester oil, diglyceride, triglyceride, perfluoropolyether, petrolatum, lanolin, ceresin, carnauba wax, solid paraffin, fatty acid, and polyhydric alcohol. , A silicone resin, a fluororesin, an acrylic resin, vinyl pyrrolide, etc., in combination to contain at least one oily component. The cosmetic of the present invention further includes a pigment, a pH adjuster, a preservative, a thickener, a surfactant, a dispersant, a stabilizer, a coloring agent, a preservative, an antioxidant, an ultraviolet absorber, and a fragrance. And the like can be appropriately compounded within a range that achieves the object of the present invention.

[0020]

The present invention will be described in more detail with reference to the following examples. The evaluation of the practical characteristics is as described later. For the effect of preventing ultraviolet rays, an in vitro SPF measurement system described in Japanese Patent Application Laid-Open No. 7-167781, which was previously developed and can measure SPF and PFA values with high accuracy, was used. Also, regarding the transparency of the preparation, a certain amount (2.0 mg /
cm ² ), and the color difference (ΔE) was calculated after measuring the color with CM-1000R (manufactured by Minolta) together with the uncoated portion. (ΔE
The lower the value, the higher the transparency. ) The stability of the preparation was measured after returning the viscosity over time (50 ° C, 1 month) to 25 ° C and confirmed by sensory evaluation.

[0021]Evaluation of practical characteristics  Apply the sample to 20 female panelists, feel and use
The climbing transparency was evaluated. <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 ××

[0022]Surface treatment of powder  First, the present inventors described the surface treatment of particulate zinc oxide.
Study was carried out. The silica coated with the silicic acid anhydride according to the present invention
Example 1 according to the present invention subjected to corn treatment, silicon
Comparative Example 1 with only myristic acid treatment and only myristic acid treatment
Sunscreen cosmetic (W / O type emulsified composition)
Product) was prepared based on the composition shown in the table below.
Value. The results are shown in the table below.

[0023]

[Table 1]  Example 1 Comparative Example 1 Comparative Example 2  Cyclomethicone 38 38 38 Dimethicone 33 33 Octyl methoxycinnamate 55 55 Polyoxyalkylene-modified polysiloxane 33 33 (polyoxyalkylene group 15%, average molecular weight 6000) Silicone resin 2 2 2 Bentonite 1 1 1 Antioxidant Appropriate amount Appropriate amount Appropriate amount Dimethicone-treated silica-coated fine particle zinc oxide 15 ― ― (Dimethicone 3% by weight, Silicic anhydride 20% by weight, fine particle zinc oxide average particle size 0.03μm) Dimethicone-treated fine particle zinc oxide -15 ― (Dimethicone 7% by weight, Fine particle zinc oxide average particle diameter 0.03 μm) Myristic acid-treated fine particle zinc oxide ― ― 15 (12% by weight of myristic acid, fine particle zinc oxide average particle diameter 0.03 μm) Aluminum stearate-treated fine particle titanium oxide 4 4 4 Nylon powder 5 5 5 ion Sympathetic water to 100 to 100 to 10 0 Glycerin 5 5 5 Dipropylene glycol 5 5 5 Preservatives proper amount proper amount proper amount Stabilizer proper amount proper amount proper amount perfume proper amount proper amount proper amount  in vitro SPF value 38.3 28.7 29.2 in vitro PFA value 9.8 6.4 7.2 Transparency (ΔE) 3.2 5.8 6.6 Tactile feel ◎ △ ○ Finished transparency ○ △ × Viscosity (50 ° C) Initial value 4800 5200 4500 1 month 4900 7400 7700 Stable (50 ° C, 1 month) ◎ △ △

As shown in the results of Table 1, Example 1 using the fine particle zinc oxide which had been subjected to the silicic acid anhydride coating treatment according to the present invention and which had been subjected to the silicone surface treatment was the same as the fine particle zinc oxide which was not subjected to such treatment. It can be seen that the SPF value is higher than that of Comparative Example 1 and Comparative Example 2 using No. and the ultraviolet ray preventing effect is excellent. Similarly, it can be seen that Example 1 has a high PFA value and is excellent in the effect of preventing UVA (320 to 400 nm) which particularly affects the sunscreen effect among ultraviolet rays. Example 1 of the present invention
Shows that not only the UV protection effect is excellent but also the ΔE is low, so that the transparency is high, the transparency of the finish is excellent, and the feel in use is good. In addition, it can also be seen that the sunscreen cosmetic of Example 1 according to the present invention has little change with time in viscosity and is excellent in stability. Therefore, it can be seen that the composite surface treatment of the particulate zinc oxide of Comparative Examples 1 and 2 according to the prior art is inferior in the stability in the system and the effect of preventing ultraviolet rays.

[0025]Polyoxyalkylene-modified polysiloxane
Identification  Next, the present inventors studied the polyoxyalkylene-modified policy.
Loxane was studied. Certain of the present invention
Fruit containing polyoxyalkylene-modified polysiloxane
Example 2, polyoxyalkylene-modified polysiloxane polysiloxane
Comparative Example 2 in which the ratio of a lioxyalkylene group is low,
Low average molecular weight ratio of silalkylene-modified polysiloxane
Under the sunscreen cosmetic (W / O type emulsified composition) of Comparative Example 4
Prepared based on the composition in the table, perform each test and evaluation
Was. The results are shown in the table below.

[0026]

[Table 2]  Example 2 Comparative Example 3 Comparative Example 4  Cyclomethicone 30 30 30 Dimethicone 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'-methoxybenzoyl Methane 1 1 1 1 Isostearic acid 1 1 1 1 Silicone treated barium sulfate 3 3 3 Cationic modified bentonite 2 2 2 Dimethicone treated silicic anhydride coated fine particle zinc oxide 18 18 18 (3% by weight dimethicone, 22% by weight silicic anhydride, fine particle zinc oxide Average particle diameter 0.025 .mu.m) Talc 5 5 5 PMMA spherical resin powder 5 5 5 Ion sympathetic water to 100 to 100 to 100 Glycerin 4 4 4 Polyethylene glycol 1 1 1 Preservative qs qs qs stabilizers qs qs qs Perfume qs qs qs  in vitro SPF value 27.4 21.4 22.2 in vitro PFA value 8.1 7.2 7.3 Transparency (ΔE) 1.8 4.6 4.9 Feeling of use ◎ ○ ○ Finished transparency ◎ △ △ Viscosity (50 ° C) Initial value 5600 5200 4700 1 month 5900 5900 5400 Stable (50 ° C, 1 month) ◎ × ×

As shown in the results of Table 2, Example 2 using the specific polyoxyalkylene-modified polysiloxane according to the present invention was compared with Comparative Example 3 using a non-specific polyoxyalkylene-modified polysiloxane. Compared with Example 4, it is understood that the SPF value is higher and the ultraviolet ray preventing effect is excellent. Similarly, Example 2 has a high PFA value, and UVA which particularly affects the sunscreen effect among ultraviolet rays.
(320 to 400 nm). In addition, it can be seen that Example 2 according to the present invention is not only excellent in the effect of preventing ultraviolet rays but also has a low ΔE, so that the transparency is high, the finished transparency is excellent, and the use feeling is good. In addition, it can also be seen that the sunscreen cosmetic of Example 2 according to the present invention has little change in viscosity over time and is excellent in stability. Therefore, it can be seen from Comparative Examples 3 and 4 that poor dispersion and poor emulsion stability are caused by the polyoxylene group and the molecular weight of the polyoxyalkylene-modified polysiloxane.

[0028]Examination of surfactant  Next, we coated the silicic anhydride and treated it with silicone.
Surfactants that disperse treated zinc oxide
Other than polyoxyalkylene-modified polysiloxane
Was examined. Specific polyoxyal according to the present invention
Example 3 in which a kilen-modified polysiloxane was blended,
Comparative Example 5 containing Lumonostearic acid, sorbitandi
Sunscreen of Comparative Example 6 containing stearic acid ester
Cosmetics (W / O type emulsified composition) based on the composition in the table below
Each test and evaluation were performed. The results are shown in the table below
You.

[0029]

[Table 3]  Example 3 Comparative Example 5 Comparative Example 6  Cyclomethicone 30 30 30 Dimethicone 55 5 5 Polyoxyalkylene-modified polysiloxane 4---(polyoxyalkylene group 20%, average molecular weight 6200) Glyceryl monostearate-4-(Polyoxyethylene 25 mol) Sorbitan distearate- -4 Silicone resin 1 1 1 1 Antioxidant appropriate amount appropriate amount appropriate amount octyl methoxycinnamate 3 3 3 monooleate 1.5 1.5 1.5 1.5 cation-modified bentonite 2 2 2 Dimethicone-treated silica-coated microparticles zinc oxide 17 17 17 (dimethicone 5% by weight, silicic acid anhydride 10% by weight, fine zinc oxide average particle diameter 0.02 μm) Calcium myristate-treated talc 5 5 5 PMMA spherical resin powder 5 5 5 Ion-interactive water to 100 to 100 to 100 4 poly Ethylene glycol 1 1 1 Preservative proper amount proper amount proper amount stabilizer proper amount proper amount proper amount perfume proper amount proper amount proper amount  in vitro SPF value 29.2 17.9 18.1 in vitro PFA value 7.2 5.4 4.9 Transparency (ΔE) 2.0 4.2 4.5 Usage feel ◎ △ △ Finished transparency ◎ △ △ Viscosity (50 ° C) Initial value 5700 4900 5100 1 month 5900 5100 5500 Stable (50 ° C, 1 month) ◎ △ △

As shown in the results in Table 3, Example 3 using the specific polyoxyalkylene-modified polysiloxane according to the present invention was compared with Comparative Examples 5 and 6 using other surfactants. As a result, the dispersibility of the powder becomes good, so that the SPF value is high, and it can be seen that the ultraviolet ray prevention effect is excellent. Similarly, Example 2 has a high PFA value, and UVA (3) which particularly affects the sunscreen effect among ultraviolet rays.
20 to 400 nm). In addition, it can be seen that Example 3 according to the present invention is not only excellent in the effect of preventing ultraviolet rays, but also has a low ΔE, and thus has high transparency, excellent finish transparency, and good use feeling. In addition, it can also be seen that the sunscreen cosmetic of Example 3 according to the present invention has little change over time in viscosity and is excellent in stability. Therefore, it can be seen from Comparative Examples 5 and 6 according to the prior art that the combination with a surfactant other than the polyoxyalkylene-modified polysiloxane results in poor powder dispersibility and poor ultraviolet light effect and transparency.

[0031]Silicic acid is coated on fine zinc oxide
Compounding amount of composite powder treated with corn surface  Next, silica oxide is coated on fine zinc oxide
The mixing amount of the surface-treated composite powder was examined. Implementation
In the composition of Example 3, fine zinc oxide was coated with silicic anhydride.
The amount of the composite powder treated with silicone
A sunscreen cosmetic having the composition shown in the following table was prepared and
About stopping effect, feeling of use, transparency and stability of finish
An evaluation was performed. Tests and evaluations are as described above, but purple
For the effect of preventing outside lines, follow the evaluation criteria below.
Was.

<Ultraviolet ray preventive effect> A composition was prepared in which a composite powder obtained by coating fine particle zinc oxide with silicic acid anhydride and treating it with a silicone surface was not blended.
The PF value and the in vitro PFA value were compared. The evaluation criteria are as follows. Increase of in vitro SPF value of 8 or more and increase of in vitro PFA value of 5 or more were observed. ◎ Increase of in vitro SPF value of 4 or more and increase of in vitro PFA value of 2 or more were observed. ○ In vitro SPF value of 1 No less than 4 and less than 4, an increase in in vitro PFA 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 ×

[0033]

[Table 4]  Test example Test example Test example Test example 1 2 3 4  Cyclomethicone 30 30 30 30 Dimethicone 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 methoxycinnamate 3 3 3 3 Monooleate 1.5 1.5 1.5 1.5 1.5 Cation-modified bentonite 222 2 Dimethicone Treated silicic acid-coated fine particle zinc oxide 3 10 23 30 (Dimethicone 5% by weight, Silicic anhydride 10 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 ionized water to 100 to 100 to 100 to 100 glycerin 4 4 4 4 polyethylene glycol 11 1 1 1 Preservatives Appropriate amount Appropriate amount Appropriate amount Appropriate amount Stabilizer Appropriate amount Appropriate Amount Appropriate amount Appropriate amount Fragrance Appropriate amount Appropriate amount Appropriate amount Appropriate amount  UV protection effect △ ○ ◎ ◎ Feeling in use ◎ ◎ ○ △ Finish transparency ◎ ◎ ○ △ Stability (1 month) ◎ ◎ ◎ ○

From the results shown in Table 4, the composite powder obtained by coating the fine particle zinc oxide according to the present invention with silicic acid in an amount of 5% by weight to 30% by weight and further surface-treating silicone with 3% by weight to 12% by weight. It can be understood that the compounding amount of 3 to 30% by weight is suitably used.

[0035]Specific polyoxyalkylene-modified polysiloxane
Sun content  Next, the specific polyoxyalkylene-modified polysiloxane
The mixing amount was examined. Specific of the composition of Example 1
Change the amount of polyoxyalkylene-modified polysiloxane
Prepared sunscreen cosmetics of the composition shown in the following table,
Outer line prevention effect, feeling of use, transparency and stability of finish
About it. The tests and evaluations are as described above.
You.

[0036]

[Table 5]  Test Example 5 Test Example 6 Test Example 7  Cyclomethicone 38 38 38 Dimethicone 33 33 Octylmethoxycinnamate 55 55 Polyoxyalkylene-modified polysiloxane 0.537 (polyoxyalkylene group 15%, average molecular weight 6000) Silicone resin 2 2 2 Bentonite 1 1 1 1 Antioxidation Agent Suitable amount Suitable amount Suitable amount Dimethicone-treated silica-coated fine particle zinc oxide 3 10 30 (dimethicone 3% by weight, silicic anhydride 20% by weight, fine particle zinc oxide average particle size 0.03 μm) Aluminum stearate-treated fine particle titanium oxide 4 4 4 Nylon powder 55 5 5 Ion-sympathetic water to 100 to 100 to 100 Glycerin 5 5 5 Dipropylene glycol 5 5 5  UV protection effect ○ ◎ ◎ Feeling of use ◎ ◎ ○ Transparency of finish ○ ◎ ◎ Stability (1 month) ○ ◎ ◎

From the results shown in Table 5, the amount of the specific polyoxyalkylene-modified polysiloxane according to the present invention was 0.5%.
It can be seen that it is suitably used at ７7% by weight.

[0038]

As described above, the sunscreen cosmetic according to the present invention is obtained by coating fine particle zinc oxide of 0.1 μm or less with silicic anhydride at a coverage of 5% by weight or more and 30% by weight or less,
Furthermore, since a composite powder obtained by surface-treating silicone at 3% by weight or more and 12% by weight or less and one or more kinds selected from specific polyoxyalkylene-modified polysiloxanes are blended, ultraviolet rays such as SPF value and PFA value are prevented. The effect and the transparency of the finish or the stability in the system can be excellent.

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Kazuhisa Ohno 1050 Nippa-cho, Kohoku-ku, Yokohama-shi, Kanagawa Prefecture F-term in Shiseido Daiichi Research Center 4C083 AB052 AB171 AB211 AB212 AB442 AC122 AC241 AC342 AC351 AC352 AD072 AD151 AD152 AD161 AD162 AD172 CC19 EE17

Claims (3)

[Claims] Claims: 1. A fine particle zinc oxide having a particle size of 0.1 μm or less is coated with silicic anhydride at a coverage of 5% by weight or more and 30% by weight or less,
Further, a composite powder obtained by surface-treating silicone at 3% by weight or more and 12% by weight or less, and one or more kinds selected from polyoxyalkylene-modified polysiloxanes represented by the following general formula [1] [2] or [3] A sunscreen cosmetic characterized by containing Embedded image Embedded image Embedded image (However, in the general formulas [1], [2] and [3], R is a methyl group or a partially phenyl group, R is hydrogen or a carbon atom having 1 to 1 carbon atoms.
2 is an alkyl group, p is a number of 1 to 5, q is a number of 2 to 3,
x, m, and n are average numbers such that the polyoxyalkylene-modified organopolysiloxane contains 5 to 40% by weight of a polyoxyalkylene group in the molecule and the molecular weight of the polyoxyalkylene-modified organopolysiloxane becomes 2000 or more. Indicates a numerical value. ) 2. The cosmetic according to claim 1, wherein a composite powder of finely divided zinc oxide treated with silicic anhydride and silicone is mixed in an amount of 3% by weight or more and 30% by weight or less, and the polyoxyalkylene-modified polysiloxane is added in an amount of 0.1% by weight or less. A sunscreen cosmetic comprising 5% by weight or more and 7% by weight or less. 3. The cosmetic according to claim 1, further comprising 0.1% by weight or more of a fatty acid, a fatty acid soap and a fatty acid ester, and 1% by weight of a powder surface-treated with the fatty acid, the fatty acid soap and the fatty acid ester. % Sunscreen cosmetic.