Emulsifier-free finely disperse systems of the oil-in-water and water-in-oil type

US6428796B1 · kind B1 · utility

Assignee

• BEIERSDORF AG · DE

Inventors

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

Key dates

• Filing date: Sep 2, 1999
• Grant date: Aug 6, 2002
• Expiry date: Sep 2, 2019

Classification

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

Abstract

Pickering emulsions, which are finely disperse systems of the water-in-oil or oil-in-water type, comprising(1) an oil phase,(2) a water phase,(3) microfine metal oxide particles,a) have an average particle size of less than 200 nm, whichb) display both hydrophilic and lipophilic properties, and are dispersible both in water and in oil and whichc) have optionally been coated on the surface,(4) at least one cyclodextrin and(5) at most 0.5% by weight of one or more emulsifiers.