Multi-stage method for producing gas-filled microcapsules

US6652782B1 · kind B1 · utility

Assignee

• SCHERING CORPORATION · US

Inventors

• Uwe Budde · Wandlitz, DE
• Andreas Briel · Berlin, DE
• Georg Rossling · Berlin, DE
• Kai Lovis · Düsseldorf, DE
• Wolfgang Schmidt
• Hans-Ulrich Moritz · Hanstedt, DE
• Michael Gottfried · Wuppertal, DE
• Jan-Peter Ingwersen · Berlin, DE

Key dates

• Filing date: Mar 27, 2002
• Grant date: Nov 25, 2003
• Expiry date: Mar 27, 2022

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10T428/2987
• WIPO field: Pharmaceuticals
• WIPO sector: Chemistry

Abstract

The invention relates to a multi-stage method for producing gas-filled microcapsules. In one stage of the method, the substance that forms the coat is polymerized. The microcapsules are formed in a physically and/or temporally separate stage, by means of a structuring process. The polymerization is carried out with moderate stirring, while the microcapsules are structured in dispersing conditions.