Compositions and Methods for Delivery of Materials
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United States of America Patent
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Issued Date -
Apr 12, 2012
app pub date -
Jun 4, 2010
filing date -
Jun 4, 2009
priority date (Note) -
Abandoned
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Abstract
Compositions for the controlled delivery of active ingredients, for example, drugs, cosmetic materials, and agricultural materials. The compositions include a multiplicity of particles, each of the particles comprising (1) a microstructure comprising a semicrystalline polymer which has a peak melting temperature, Tp, of at least 20° C., and (2) the active ingredient. The microstructure comprises
- (i) crystalline domains of the semicrystalline polymer, the crystalline domains being separate from each other, and(ii) amorphous domains of the semicrystalline polymer, the amorphous domains providing a multiplicity of tortuous paths between the crystalline domains.
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