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Water-In-Oil Type Emulsion Sunscreen Cosmetics

a sunscreen and oil-type technology, applied in the field of water-in-oil-type emulsion sunscreen cosmetics, can solve the problems of redness in the appearance of the formulation, and achieve the effect of excellent uv blocking effect and excellent effect in the prevention and inhibition of discoloration

Inactive Publication Date: 2010-09-16
SHISEIDO CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0015]According to the present invention, water-in-oil type emulsion sunscreen cosmetics that can satisfactorily achieve an excellent UV blocking effect and have excellent effects in the prevention and inhibition of discoloration (discoloration to red) can be provided.

Problems solved by technology

However, there is a problem in that the appearance of the formulation turns extremely red when a hydrophobized UV scattering agent (especially zinc oxide) is used in combination with a cationic surfactant in water-in-oil type sunscreen cosmetics.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0079]In a simple oil phase system, the prevention and inhibition effects of red discoloration were evaluated according to the above-described evaluation criteria. The evaluation was conducted, with the use of samples A to K of the below-described compositions, in relation to the blending / non-blending of respective components (a) to (d), system discoloration to red, and the prevention and inhibition effects of red discoloration. The results are shown in Table 1.

[0080]In Table 1, “octocrylene”(*1), in which the amount of 2-ethylhexyl cyanoacetate is about 1000 ppm, and “octocrylene”(*2), in which the amount of 2-ethylhexyl cyanoacetate is about 100 ppm, were used. They were the same in examples in Table 2 and examples in tables below Table 2.

[0081]In Table 1, the percentages (mass ratio) of component (b) and component (c) in “(6) hydrophobized (silane treatment) / cation-treated zinc oxide [component (b)+component (c)]” were about 98% by mass and about 2% by mass, respectively.

[0082]Th...

example 2

[0085]For the case in that component (c) and component (d) are individually blended instead of blending the powder coated therewith, the blending amounts and the prevention effect of red discoloration were evaluated according to the above-described evaluation criteria. The results are shown in Tables 2 and 3.

[0086]In Table 2, the percentages (mass ratio) of component (b) and component (c) in “(5) hydrophobized (silane treatment) / cation-treated zinc oxide [component (b)+component (c)]” were about 98% by mass and about 2% by mass, respectively.

TABLE 2Sample XSample Y(1)DecamethylcyclopentasiloxaneBalanceBalance(2)Methylphenylpolysiloxane2020(3)Octocrylene (*2) [component (a)]1515(4)Hydrophobized (silane treatment) zinc oxide—15[component (b)](5)Hydrophobized (silane treatment) / cation-15—treated zinc oxide [component (b) +component (c)](6)Distearyldimethylammonium chloride—Table 3[component (c)](7)Silica powder [component (d)]—Table 3Prevention and inhibition effects of redXTable 3disc...

example 3

[0088]The discoloration of a system (sample Z) in which other powder components are blended instead of silica was evaluated according to the above-described evaluation criteria. The results are shown in Tables 4 and 5.

[0089]In Table 4, the percentages (mass ratio) of component (b) and component (c) in “(5) hydrophobized (silane treatment) / cation-treated zinc oxide [component (b)+component (c)]” were about 98% by mass and about 2% by mass, respectively.

TABLE 4SampleZ(1)DecamethylcyclopentasiloxaneBalance(2)Methylphenylpolysiloxane20(3)Octocrylene (*1) [component (a)]15(4)Hydrophobized (silane treatment) zinc oxide—[component (b)](5)Hydrophobized (silane treatment) / cation-treated zinc oxide15[component (b) + component (c)](6)Distearyldimethylammonium chloride [component (c)]—(7)Powder component shown in table 5 6Prevention and inhibition effects of red discolorationTable 5(at 70° C. for 3 days, visual evaluation)

TABLE 5Prevention and inhibitioneffects of red discoloration(at 70° C. fo...

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Abstract

The present invention provides water-in-oil type emulsion sunscreen cosmetics that achieve an excellent UV blocking effect, and have excellent effects in the prevention and inhibition of discoloration (discoloration to red). The water-in-oil emulsion sunscreen cosmetic according to the present invention is characterized by comprising: (a) octocrylene; (b) hydrophobized zinc oxide; (c) cationic surfactant; and (d) silica.

Description

RELATED APPLICATIONS[0001]This application claims the priority of Japanese Patent Application No. 2006-043215 filed on Feb. 20, 2006, which are incorporated herein by reference.FIELD OF THE INVENTION[0002]The present invention relates to water-in-oil type emulsion sunscreen cosmetics. In particular, the present invention relates to water-in-oil type emulsion sunscreen cosmetics that have an excellent UV protection capability and have excellent effects in the prevention and inhibition of discoloration (discoloration to red).BACKGROUND OF THE INVENTION[0003]Generally, in order to block UV radiation to the skin and achieve high SPF (Sun Protection Factor) values, UV absorbers or UV scattering agents (zinc oxide etc.) are blended in sunscreen cosmetics (refer to patent literatures 1 and 2, for example).[0004]It is generally known that the improvement in formulation stability, improvement in removability, and the improvement in powder dispersibility are made by blending cationic surfacta...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): A61K8/06A61Q17/04
CPCA61K8/06A61K8/064A61K8/25A61K8/27A61K8/0245A61K8/416A61K8/585A61K8/738A61Q17/04A61K8/40A61K8/894
Inventor SHIRAO, MASAYUKIYAMAGUCHI, KAZUHIROMATSUI, TAKASHIYOSHIKAWA, NORINOBUNOMURA, YUKI
Owner SHISEIDO CO LTD
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