Zero order release and temperature-controlled microcapsules...

Details Zero order release and temperature-controlled microcapsules... Zero order release and temperature-controlled microcapsules...

2007-02-20

2007-02-20

Staicovici, Stefan (Department: 3264)

Plastic and nonmetallic article shaping or treating: processes

Encapsulating normally liquid material

Liquid encapsulation utilizing an emulsion or dispersion to...

C264S004320, C264S004330, C264S004400, C264S007000, C264S009000, C264S012000, C264S014000, C428S402240, C428S403000

Reexamination Certificate

active

10373298

ABSTRACT:
A microcapsule composition comprising a core material in a matrix of polymorphic shell material, releases said core material in an aqueous environment in accordance with zero order linear release profile. A preferred composition comprises a core material having a degree of water solubility entrapped in a beta crystalline matrix of water insoluble shell material which matrix may, optionally, be surrounded by a contiguous core material-free layer of water insoluble shell material. Also disclosed is a process for the preparation of microcapsules comprising subjecting a flowable mixture of core material and a first amount of water insoluble shell material to a pressure force to form a pressure-treated mixture, and passing said pressure-treated mixture through a spray nozzle into a chilling zone to form a solidified composition. A special embodiment of the method providing for the long term moisture stability of the resulting microcapsules subjects the microcapsules prepared in the first step to a second coating with a second amount of water insoluble shell material.

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