Multi-layered microcapsules and method of preparing same
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United States of America Patent
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Jan 2, 2007
Grant Date -
N/A
app pub date -
May 31, 2002
filing date -
May 31, 2002
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A multi-layered microcapsule containing one or more active ingredients and process for preparing the same is disclosed. The multi-layered microcapsule comprises an inner solid microparticle core, typically composed of a biodegradable polymer, and having one or more alternating layers of polymer, active ingredient or polymer/active ingredient mixtures to produce a multi-layered microcapsule wherein the polymer or active ingredient in each layer may be the same or different or have the same or different concentration of the polymer or active ingredient in other layers.
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