Method and apparatus for producing composite particles using...

Details Method and apparatus for producing composite particles using... Method and apparatus for producing composite particles using...

2004-02-18

2008-11-11

Drodge, Joseph W (Department: 1797)

Plastic and nonmetallic article shaping or treating: processes

Formation of solid particulate material directly from molten...

C239S010000, C264S012000, C424S486000, C424S489000

Reexamination Certificate

active

07449136

ABSTRACT:
The present invention provides methods for producing composite particles using supercritical fluid as a plasticizing and extracting agent, composite particles formed in accordance with the methods and an apparatus for carrying out the methods. In accordance with the methods of the invention, a polymer, a wax and/or a lipid that is a solid at standard temperature and pressure is contacted with a supercritical fluid to form a melt, either before or after the polymer, wax and/or lipid has been contacted with a solution comprising a solute dissolved in a solvent. The supercritical fluid plasticizes the polymer, wax and/or lip and extracts the solvent from the solution, resulting in the formation of a two-fraction system including a first melt-rich fraction that includes the plasticized melt and fine particles of precipitated solute that are dispersed in the melt, and a second fraction that includes the supercritical fluid and the solvent. Expansion of the first fraction across a pressure drop results in the formation of composite particles that include the polymer, wax and/or lipid and the solute.

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