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External preparation for skin and method for improving ultraviolet protection effect

A technology for skin external preparations and ultraviolet rays, which is applied in skin care preparations, pharmaceutical formulas, and cosmetic preparations, etc. It can solve problems such as inability to suppress stickiness and difficulty in achieving high SPF values

Pending Publication Date: 2021-08-31
SHISEIDO CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In general, in order to compound a high level of ultraviolet absorber and ultraviolet scatterer, a high oil content is required, but if the oil content is high, there is a problem that stickiness cannot be suppressed
In particular, it is difficult to achieve a high SPF value for oil-in-water emulsified cosmetics that require a moist feeling and good spread.

Method used

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  • External preparation for skin and method for improving ultraviolet protection effect
  • External preparation for skin and method for improving ultraviolet protection effect
  • External preparation for skin and method for improving ultraviolet protection effect

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0074] Among the oils shown in Table 1, cyclopentasiloxane, isododecane, dimethicone, and farnesol were copolymerized with polyoxyethylene / methicone as a surfactant The ingredients were mixed with the prescription shown in Table 1 (mixed solution). In addition, diethylhexyloxyphenol methoxyphenyl triazine, ethylhexyl triazine, 4 - Tert-butyl-4'-methoxybenzoylmethane and diethylaminohydroxybenzoyl hexyl benzoate were heated and melted (solution solution). Add the dissolving solution to the mixed solution and mix, and add distearyl dimethyl ammonium hectorite as a thickener and spherical cross-linked PMMA (polymethyl methacrylate) powder as a practical powder make it scattered. Next, a solution in which water, glycerin, and ethanol were mixed was added and emulsified to obtain an emulsified cosmetic.

Embodiment 2～6、 comparative example 2

[0082] In Example 1, the emulsified cosmetics of the respective examples were obtained in the same manner as in Example 1 except that the ultraviolet scattering agent was dispersed together with the powder for use. The rate of improvement measured in the same manner as in Example 1 is shown in Table 2 together with the prescription as a relative value of Comparative Example 2. As shown in Table 2, the emulsified cosmetics of Examples 2 to 6 containing farnesol showed an ultraviolet protection effect increased by 7 to 33%.

[0083]

Embodiment 7～11、 comparative example 3～7

[0085] Each of the ultraviolet absorbers shown in Table 3 was added to cetyl 2-ethylhexanoate or hydrogenated polydecene, heated and melted, and in Examples 7 to 11, farnesol was mixed therein. In Examples 9-11 and Comparative Examples 5-7, the cosmetics of each example were obtained by further mixing with ethanol. The improvement rates of Examples 7 to 11 are shown in Table 3 together with the prescriptions as relative values ​​of Comparative Examples 3 to 7 for comparison. As shown in Table 3, although the increase rate of the ultraviolet protection effect varies depending on the type of ultraviolet absorber, an increase in the ultraviolet protection effect was confirmed in any cosmetic.

[0086]

[0087] Prescription examples of the external preparation for skin of the present invention are shown below.

[0088] Prescription Example 1: Oil-in-Water Sunscreen Gel

[0089]

[0090]

[0091]

[0092] Prescription example 2: Water-in-oil type BB cream

[0093] ...

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PUM

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Abstract

The invention provides an external preparation for skin having improved ultraviolet protection effect. Also, provided is a method for improving ultraviolet protection effect. The solution is that an external preparation for skin comprises an ultraviolet scattering agent and / or an ultraviolet absorbent and farnesol. In additio, a preparation for skin comprises farnesol as an active ingredient for improving ultraviolet protection effect. A method for improving ultraviolet protection effect in which farnesol is used.

Description

technical field [0001] The present invention relates to an external preparation for skin and a method for improving an ultraviolet protection effect. Background technique [0002] The purpose of sunscreen cosmetics is to block the ultraviolet rays in the sun's rays and protect the skin from the adverse effects caused by ultraviolet rays. As the base, emulsifying type, lotion type, oil type, etc. can be mentioned, but no matter what kind of base agent , In order to block the ultraviolet radiation on the skin and obtain a high SPF (sun protection factor, Sun Protection Factor) value, it is highly mixed with ultraviolet absorbers and ultraviolet scattering agents. In general, in order to compound high ultraviolet absorbers and ultraviolet scattering agents, a high compounding oil content is required, but there is a problem that stickiness cannot be suppressed if the high oil content is compounded. In particular, it is difficult to achieve a high SPF value for oil-in-water emul...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A61Q17/04A61K8/19A61K8/34A61K8/49
CPCA61K8/41A61K8/34A61K8/35A61K8/49A61Q17/04A61K8/19
Inventor 长井宏一胜山雅子八卷悟史柳原茜
Owner SHISEIDO CO LTD
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