POLYTETRAFLUOROETHYLENE FINE POWDER, POLYTETRAFLUOROETHYLENE FORMED ARTICLE PREPARED FROM THE SAME AND METHOD FOR PREPARATION OF THE SAME

摘要

The present invention provides a polytetrafluoroethylene molded article, particularly a PTFE molded article for high-frequency insulation, which is excellent in various electric properties and mechanical properties in a high frequency range of 3 to 30 GHz. The present invention also provides PTFE fine powder, which is excellent in extrusion moldability and capable of providing the molded article, and a process for preparing the same. More specifically, the present invention relates to a polytetrafluoroethylene fine powder having a standard specific gravity of 2.180 to 2.225, which is obtained by contacting polytetrafluoroethylene fine powder having a standard specific gravity of 2.180 to 2.225 with a fluorine radical source, wherein tan delta at 12 GHz of a film comprising the powder, which is obtained by cooling at 5 to 50 DEG C/second after baking, is at most 2.0 x 10<-4>.