PROCESS FOR PRODUCING POLYTETRAFLUOROETHYLENE FINE POWDER

摘要

The present invention provides a process for producing a PTFE fine powder having superior handling characteristics despite of a low apparent density. The present invention relates to a process for producing a polytetrafluoroethylene fine powder characterized by including: (1) a step of preparing an aqueous dispersion containing polytetrafluoroethylene, water and a surfactant (A); (2) a step of initiating coagulation of the polytetrafluoroethylene in said aqueous dispersion by agitating said aqueous dispersion; (3) a step of adding a surfactant (B) after the step (2); (4) a step of terminating coagulation after the step (3); (5) a step of collecting a wet powder of the polytetrafluoroethylene; and (6) a step of drying the wet powder of the polytetrafluoroethylene.