Method for preparing smooth-surface spherical microparticles completely or partially made of at least one water-insoluble linear polysaccharide and microparticles produced according to this method

US6723429B2 · kind B2 · utility

Assignee

• Celanese Ventures GmbH · DE

Inventors

• Holger Bengs · Frankfurt, DE
• Jürgen Grande · Bad Soden, DE
• Silke Schuth · Ruppach-Goldhausen, DE
• Gitte Böhm · Frankfurt, DE
• Arnold Schneller · Mainz, DE
• Anette Brunner · Roth, DE

Key dates

• Filing date: Feb 28, 2001
• Grant date: Apr 20, 2004
• Expiry date: Apr 18, 2022

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10T428/2982
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

The present invention relates to a method for preparing smooth-surface spherical microparticles which are completely or partially made of at least one water-insoluble linear polysaccharide. This method involves dissolving the at least one water-insoluble linear polysaccharide in a solvent or a mixture of solvents, introducing the solution into a precipitation agent or a mixture of precipitation agents, optionally cooling the mixture thus obtained, and separating the microparticles thus formed. The precipitation agent used consists of at least one water-soluble cellulose derivative. This invention also relates to microparticles obtained according to this method.