Emulsifier-free finely dispersed systems of the water-in-oil type

US6440399B1 · kind B1 · utility

Assignee

• BEIERSDORF AG · DE

Inventors

• Heinrich Gers-Barlag · Kummerfeld, DE
• Anja Müller · Bad Oldesloe, DE

Key dates

• Filing date: Feb 9, 2000
• Grant date: Aug 27, 2002
• Expiry date: Feb 9, 2020

Classification

• Technology area (CPC A): Human Necessities
• CPC primary: A61K2800/413
• WIPO field: Pharmaceuticals
• WIPO sector: Chemistry

Abstract

Emulsifier-free cosmetic or dermatological preparations, which are finely dispersed systems of the oil-in-water type, comprising1. an oil phase,2. an aqueous phase and3. one or more types of micronized, inorganic pigments whicha) have an average particle size of less than 200 nm, and whose particlesb) have both hydrophilic and lipophilic properties, i.e. have an amphiphilic character, and thus position themselves at the water/oil interface, and whichc) are selected from the group consisting of metal oxides, whichd) are optionally coated on the surfaceand also optionally comprising further cosmetic or pharmaceutical auxiliaries, additives and/or active ingredients.