High surface area micro-porous fibers from polymer solutions
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United States of America Patent
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Aug 24, 2004
Grant Date -
Jun 26, 2003
app pub date -
Apr 16, 2002
filing date -
Apr 20, 2001
priority date (Note) -
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Abstract
Fibers are produced from an acetone solution of cellulose acetate by pulling or extruding such material through a spinneret in a dry spinning process. A vacuum is applied to the thus formed fibers after a certain degree of drying. A dried outer skin is formed, and the vacuum causes the solvent inside the skin to explode or pop and exit the fiber along micro-porous paths thereby producing high surface area fibers with micro-porous cavities and internal void volume. Such micro-cavities are particularly useful for retaining solid and/or liquid reagents in a cigarette filter for selective filtration of various smoke components.
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