Water-in-oil emulsified sunscreen cosmetic

Patent metadata

Field	Value
Publication number	US-9364400-B2
Application number	US-201214002124-A
Country	US
Kind code	B2
Filing date	Aug 9, 2012
Priority date	Aug 31, 2011
Publication date	Jun 14, 2016
Grant date	Jun 14, 2016

Abstract

The present invention provides a water-in-oil emulsified sunscreen cosmetic characteristically comprising the following (a) through (g):
(a) Ultraviolet absorbent (b) Silicone backbone powder (c) Methyl polymethacrylate powder (d) Hydrophobicized platelike powder (e) Surfactant (f) Oil component (g) Water

The object of the present invention is to provide a water-in-oil emulsified sunscreen cosmetic that manifests a superior texture during use, a high ultraviolet protection effect, and superior stability.

First claim

The invention claimed is:

1. A water-in-oil emulsified sunscreen cosmetic comprising the following (a) through (g):
(a) Ultraviolet absorbent
(b) Silicone backbone powder
(c) Methyl polymethacrylate powder
(d) Hydrophobicized plate powder
(e) Surfactant
(f) Oil component
(g) Water;

wherein:
the blend ratio of said (b) silicone backbone powder is 0.1-12 wt % relative to the total amount of the water-in-oil emulsified sunscreen cosmetic;
the blend ratio of said (c) methyl polymethacrylate powder is 0.1-12 wt % relative to the total amount of the water-in-oil emulsified sunscreen cosmetic;
the blend ratio of said (d) hydrophobicized plate powder is 0.1-12 wt % relative to the total amount of the water-in-oil emulsified sunscreen cosmetic;
said (a) ultraviolet absorbent is one, two or more selected from the group consisting of ethylhexyl methoxycinnamate, octocrylene, polysilicone-15, t-butylmethoxydibenzoylmethane, ethylhexyl triazone, diethlyaminohydroxybenzoyl hexyl benzoate, bis ethylhexyloxyphenol methoxyphenyl triazine, oxybenzone-3, methylene bis benzotriazolyl tetramethylbutylphenol, phenylbenzimidazole sulfonic acid, homosalate, and ethylhexyl salicylate;
said (b) silicone backbone powder is polymethylsilsesquioxane; and
said (d) hydrophobicized plate powder is dimethicone-treated talc.

2. The water-in-oil emulsified sunscreen cosmetic of claim 1 , wherein the dimethicone-treated talc powder has an average particle size of 5-30 micrometers.

3. The water-in-oil emulsified sunscreen cosmetic of claim 1 , wherein the sum of the blend ratios of said (b) silicone backbone powder, said (c) methyl polymethacrylate powder, and said (d) hydrophobicized plate powder is 6.1-12.2 wt % relative to the total amount of the water-in-oil emulsified sunscreen cosmetic.

4. A water-in-oil emulsified sunscreen cosmetic comprising the following (a) through (g):
(a) Ultraviolet absorbent
(b) Silicone backbone powder
(c) Methyl polymethacrylate powder
(d) Hydrophobicized plate powder
(e) Surfactant
(f) Oil component
(g) Water;

wherein:
the blend ratio of said (b) silicone backbone powder is 0.1-6 wt % relative to the total amount of the water-in-oil emulsified sunscreen cosmetic;
the blend ratio of said (c) methyl polymethacrylate powder is 0.1-12 wt % relative to the total amount of the water-in-oil emulsified sunscreen cosmetic;
the blend ratio of said (d) hydrophobicized plate powder is 0.1-12 wt % relative to the total amount of the water-in-oil emulsified sunscreen cosmetic;
said (a) ultraviolet absorbent is one, two or more selected from the group consisting of ethylhexyl methoxycinnamate, octocrylene, polysilicone-15, t-butylmethoxydibenzoylmethane, ethylhexyl triazone, diethlyaminohydroxybenzoyl hexyl benzoate, bis ethylhexyloxyphenol methoxyphenyl triazine, oxybenzone-3, methylene bis benzotriazolyl tetramethylbutylphenol, phenylbenzimidazole sulfonic acid, homosalate, and ethylhexyl salicylate;
said (b) silicone backbone powder is polymethylsilsesquioxane and (vinyl dimethicone/methicone silsesquioxane) crosspolymer; and
said (d) hydrophobicized plate powder is dimethicone-treated talc.

5. The water-in-oil emulsified sunscreen cosmetic of claim 4 , wherein the dimethicone-treated talc powder has an average particle size of 5-30 micrometers.

6. The water-in-oil emulsified sunscreen cosmetic of claim 4 , wherein the sum of the blend ratios of said (b) silicone backbone powder, said (c) methyl polymethacrylate powder, and said (d) hydrophobicized plate powder is 6.1-12.2 wt % relative to the total amount of the water-in-oil emulsified sunscreen cosmetic.

Assignees

• Ikebe Yosuke
• Abe Koji
• Shiseido Co Ltd

Inventors

• Ikebe Yosuke
• Abe Koji

Classifications

• A61K8/8152

  Homopolymers or copolymers of esters, e.g. (meth)acrylic acid esters; Compositions of derivatives of such polymers · CPC title

• A61K8/0254

  Platelets; Flakes · CPC title

• A61K8/894

  modified by a polyoxyalkylene group, e.g. cetyl dimethicone copolyol · CPC title

• A61K8/064 Primary

  Water-in-oil emulsions, e.g. Water-in-silicone emulsions · CPC title

• A61K2800/612

  By organic compounds · CPC title