Microencapsulation of biologically active material

US5100673A · kind A · utility

Assignee

• Hoechst GmbH · DE

Inventors

• Hebert Bader · Mainz, DE
• Karl-Heinz Keil · Hanau, DE
• Diether Ruppel · Frankfurt am Main, DE
• Merten Schlingmann · Königstein, DE
• Axel Walch · Baldham, DE

Key dates

• Filing date: Feb 21, 1990
• Grant date: Mar 31, 1992
• Expiry date: Feb 21, 2010

Classification

• Technology area (CPC B): Performing Operations; Transporting
• CPC primary: B01J13/10
• WIPO field: Pharmaceuticals
• WIPO sector: Chemistry

Abstract

Polyelectrolyte membrane capsules are composed of a semi-permeable membrane and an active material enclosed by it, the membrane being formed of a biocompatible, non-toxic polyacid and a polybase; the polybase is composed of repeating monomer units of the formula (I) ##STR1## in which R.sup.1 and R.sup.2 have the indicated meanings.