Porous particles, their aqueous dispersions, and method of preparation
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United States of America Patent
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Oct 14, 2003
Grant Date -
Aug 15, 2002
app pub date -
Dec 13, 2001
filing date -
Feb 15, 2001
priority date (Note) -
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Abstract
A method of forming, by polymerization in an aqueous dispersion at pressures in excess of one atmosphere, a plurality of porous particles having at least one polymeric phase and, additionally, having a pore filling phase containing a fugitive substance is disclosed. Replacement of the fugitive substance with a gas is further disclosed. Gas-filled porous particles and their aqueous dispersions are also disclosed.
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