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Water-in-oil emulsion type sunscreen cosmetic

A technology of water-in-oil type and cosmetics, which is applied in the direction of cosmetics, cosmetic preparations, dressing preparations, etc., to achieve the effect of excellent stability

Active Publication Date: 2011-01-19
SHISEIDO CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

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Method used

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  • Water-in-oil emulsion type sunscreen cosmetic

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0086] "Example 1, Comparative Examples 1-4"

[0087] Sunscreen cosmetics were prepared according to the formulations shown in Table 1 below. Specifically, (9) [Part B] is added to (1) to (8) [Part A] and dispersed uniformly, then (10) to (12) [Part C] is added thereto and dispersed uniformly, and then Slowly add (13) to (20) [Part D] to emulsify to obtain a water-in-oil emulsified sunscreen cosmetic.

[0088] In addition, the water phase of Example 1 and Comparative Examples 1-4 is 30.9-31.15% (mass).

[0089] [Whether crystals are precipitated]

[0090] Regarding the obtained sunscreen cosmetics (samples), whether or not crystals of phenylbenzimidazolesulfonic acid precipitated were evaluated by the following procedures. The results are shown in Table 1.

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Abstract

Disclosed is a water-in-oil emulsion type sunscreen cosmetic which contains (a) 0.1 to 10 mass% of dimethyl diethyl benzalmalonate, (b) 0.02 to 8 mass% of phenylbenzimidazole sulfonic acid, and (c) a neutralizing agent for the component (b), wherein an aqueous phase makes up 40 mass% or less of the cosmetic. It becomes possible to provide a water-in-oil emulsion type sunscreen cosmetic which comprises (a) dimethyl diethyl benzalmalonate and (b) phenylbenzimidazole sulfonic acid, does not cause the crystallization of phenylbenzimidazole sulfonic acid contained therein, and is extremely stable over time.

Description

technical field [0001] The present invention relates to water-in-oil emulsified sunscreen cosmetics. More specifically, it relates to a water-in-oil type emulsified sunscreen cosmetic that is excellent in UV protection ability, does not precipitate crystals in an ultraviolet absorber, and has extremely excellent matrix stability. Background technique [0002] In sunscreen cosmetics, in order to shield the irradiation of ultraviolet rays on the skin to obtain a high SPF (Sun Protection Factor, sun protection factor) value, an ultraviolet absorber or an ultraviolet scattering agent (zinc oxide, titanium dioxide, etc.) is mixed (for example, refer to Patent Document 1 ~2). [0003] One of the UV absorbers mixed in sunscreen cosmetics is Octocrylene. Although octocrylene is widely used as a UV absorber, it will become smelly over time when used in combination with hydrophobized UV scattering agents (zinc oxide, titanium dioxide, etc.) in water-in-oil sunscreen cosmetics. In o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A61K8/37A61K8/19A61K8/29A61K8/41A61K8/46A61K8/893A61Q17/04
CPCA61K8/27A61K8/06A61K8/466A61Q17/04A61K8/41A61K8/064A61K8/894A61K8/893A61K8/29
Inventor 池边洋介山口和弘
Owner SHISEIDO CO LTD
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