Patent ID: 6440559
Filing Date: 2002-08-27
Classification: C08J,Y10T

Abstract:
A process for preparing a polytetrafluoroethylene granular powder having an apparent density of not less than 0.60 g/ml and an electrostatic charge of not more than 50 V by granulation of a polytetrafluoroethylene powder; characterized in that 100 parts of the polytetrafluoroethylene powder is wetted with 30 to 60 parts of an aqueous solution containing a nonionic surfactant having a hydrophobic segment comprising a poly(oxyalkylene) unit having 3 or 4 carbon atoms and a hydrophilic segment comprising a poly(oxyethylene) unit and then a mechanical force is applied to the wetted polytetrafluoroethylene powder.