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

US6379680B2 · kind B2 · utility

Assignee

• BEIERSDORF AG · DE

Inventors

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

Key dates

• Filing date: Dec 6, 1999
• Grant date: Apr 30, 2002
• Expiry date: Dec 6, 2019

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 water-in-oil type, comprising1. an oil phase,2. an aqueous phase and3. one or more type 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 substances.