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Processes for preparing carbon fibers using sulfur trioxide in a halogenated solvent

United States Patent

December 29, 2015
View the Complete Patent at the US Patent & Trademark Office
Disclosed here are processes for preparing carbonized polymers (preferably carbon fibers), comprising sulfonating a polymer with a sulfonating agent that comprises SO.sub.3 dissolved in a solvent to form a sulfonated polymer; treating the sulfonated polymer with a heated solvent, wherein the temperature of the solvent is at least C.; and carbonizing the resulting product by heating it to a temperature of C. Carbon fibers made according to these methods are also disclosed herein.
Patton; Jasson T. (Midland, MI), Barton; Bryan E. (Midland, MI), Bernius; Mark T. (Bowling Green, OH), Chen; Xiaoyun (Midland, MI), Hukkanen; Eric J. (Midland, MI), Rhoton; Christina A. (Beaverton, MI), Lysenko; Zenon (Midland, MI)
Dow Global Technologies LLC (Midland, MI)
14/ 413,456
July 3, 2013
STATEMENT OF GOVERNMENT INTEREST This invention was made under a NFE-10-02991 between The Dow Chemical Company and UT-Batelle, LLC, operating and management Contractor for the Oak Ridge National Laboratory operated for the United States Department of Energy. The Government has certain rights in this invention.