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Verfahren zum Mikroverkapseln von Partikeln

Micro-encapsulation of fine substrate particles - comprises applying the coating agent dissolved in supercritical fluid, preferably carbon di oxide, onto the substrate in a fluidised bed.
: Niehaus, M.; Teipel, U.; Krause, H.

Frontpage ()

DE 1997-19711393 A: 19970319
DE 1997-19711393 A: 19970319
EP 1998-104235 A: 19980310
DE 19711393 C1: 19980813
EP 865819 A: 19980923
Patent, Electronic Publication
Fraunhofer ICT ()

Production of microcapsules comprises spraying drops or fine particles of a solution of the coating agent in a supercritical fluid onto <100 mu m particles of the substrate in a fluidised bed. USE - (I) are useful in the production of (especially sustained release) pharmaceuticals and fertilisers, and of catalysts, propellants and explosive materials, e.g. hexogen coated with pentaerythritol tetranitrate (PETN) and trinitrotoluene (TNT). ADVANTAGE - The process avoids aggregation due to the reduced adhesion effect of the supercritical solvent. When CO2 is used as solvent, costas are reduced. The product (especially pharmaceutical or explosive) is free from all traces of the solvent.