| abstract |
The present invention relates a microcapsule that comprises an active pharmaceutical ingredient and a polymeric shell comprised of polymeric materials such as polyether, polyester, polyamine, polyamide, polyurea, polyurethane, polythiocarbamate, and polythiocarbonate. The outer surface of shell comprises surface functional groups such as hydroxide, primary amine, carboxylic acid, or protected forms thereof. These surface functional groups may be reacted further with reactants to place specific organic groups on the surface of the microcapsule. Such microcapsules are prepared by a modified interfacial condensation polymerization. |