Process of producing a particle having a core-shell structure
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United States of America Patent
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Sep 6, 2011
Grant Date -
Jun 11, 2009
app pub date -
Feb 3, 2009
filing date -
Nov 28, 2003
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Expired
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Abstract
A multiple particle (e.g., a spherical particle) comprising an organic solid component (A) containing a plurality of organic solid materials (e.g., polymers) is produced by eluting a water-soluble auxiliary component (B) containing at least an oligosaccharide (B1) from a composition having a disperse system, in which a particulate dispersed phase comprising the organic solid component (A) is dispersed in a matrix comprising the auxiliary component (B). The organic solid materials may be different in affinity relative to the auxiliary component (B) from each other. The particle may have a core-shell structure which comprises a core containing a first organic solid material (e.g., a hydrophobic polymer) and a shell containing a second organic solid material (e.g., a hydrophilic polymer) immiscible with the first organic solid material.
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