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

US6692755B2 · kind B2 · utility

Assignee

• BEIERSDORF AG · DE

Inventors

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

Key dates

• Filing date: Apr 25, 2002
• Grant date: Feb 17, 2004
• Expiry date: May 29, 2022

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 which contains a wax and/or an oil thickener,(2) a water phase,(3) at least one type of microfine particles whicha) have an average particle size of less than 200 nm, whichb) display both hydrophilic and lipophilic properties, i.e. which have amphiphilic character, and are dispersible both in water and in oil and whichc) have optionally been coated on the surface,(4) at least one type of non-amphiphilic metal oxide pigments and(5) at most 0.5% by weight of one or more emulsifiers.