Method and apparatus for preparing microspheres
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United States of America Patent
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Mar 14, 2006
Grant Date -
May 22, 2003
app pub date -
Apr 26, 2001
filing date -
Apr 28, 2000
priority date (Note) -
Expired
status (Latency Note)
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Abstract
An improved method for the preparation of a microsphere from an emulsion wherein an organic phase containing an organic solvent having a boiling point lower than that of water and a hardly-water-soluble polymer is emulsified in an aqueous phase by an in-water drying method, which method includes: (1) providing a gas separation membrane; (2) supplying the emulsion to be subjected to in-water drying to one side of the gas separation membrane; and (3) evaporating off the organic solvent contained in the emulsion to the other side of the gas separation membrane, which can remove the organic solvent with high efficiency and can be carried out in a closed system and hence is favorable from an environmental viewpoint.
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