Foamed microbeads and a process for their preparation

US4804687A · kind A · utility

Assignee

• BAYER HEALTHCARE LLC · DE

Inventors

• Norbert Weimann · Leverkusen, DE
• Manfred Dahm · Leverkusen, DE
• Ulrich Nehen · Leverkusen, DE
• Walter Schafer · Leichlingen, DE

Key dates

• Filing date: Mar 17, 1988
• Grant date: Feb 14, 1989
• Expiry date: Mar 17, 2008

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10S521/901
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

Foamed microbeads with a shell and an encased core are characterized in that the shell is a reaction product of an NCO-containing carbodiimide and a polyamine, and the core is at least partly filled with a polymeric carbodiimide or its reaction product with a polyamine, and in that the foamed microbeads are self-supporting and can be laden with hydrophilic and if appropriate hydrophobic liquids.