Patent ID: 7708805

Claim:
A method of producing porous carbon fibers, which comprises the following steps: a) producing a spinning mixture containing a polyacrylonitrile-based polymer A and a carbonizable organic polymer B, the polymer B including a metallo-organic polymer, having an original mass, and being carbonizable under non-oxidizing conditions to leave behind a solid non-volatile residue of at least 22% of the original mass; b) spinning the spinning mixture to form fibers of polymer A with finely dispersed polymer B therein; c) stabilizing the fibers by oxidation; and d) carbonizing or graphitizing the fibers under non-oxidizing conditions, whereas a solid non-volatile residue of at least 22% of the original mass from the polymer B is formed; wherein the polymer B is selected from polymers which, upon carbonization, form a residue in percent of the original mass below the carbonization residue of the polyacrylonitrile-based polymer A, and which have a melting point above a process temperature at which the fiber is oxidized in step c).