Abstract: A method of producing a paraffin wax for aqueous dispersion polymerization of TFE which allows high speed aqueous dispersion polymerization of TFE with excellent polymerization behavior such as excellent dispersion stability and consistent production of PTFE having excellent physical properties, and a method of producing PTFE using the paraffin wax. Aqueous dispersion polymerization of tetrafluoroethylene (hereinafter referred to as TFE) is conducted in the presence of a paraffin wax, a polymerization initiator and an emulsifier at least once and then the paraffin wax is recovered. The recovered paraffin wax is used for aqueous dispersion polymerization of TFE in the presence of a polymerization initiator and an emulsifier.

Abstract: A process for producing a tetrafluoroethylene polymer, which comprises polymerizing tetrafluoroethylene in an aqueous medium in the presence of a water-soluble initiator, wherein the water used for the polymerization is regulated to have a TOC of 100 ppb or lower and/or an electrical conductivity of 1.0 &mgr;S/cm or lower. When this process for producing a tetrafluoroethylene polymer is employed, a decrease or fluctuation in the polymerization rate during the polymerization of tetrafluoroethylene will be minimal, and a deterioration in the physical properties of the obtained tetrafluoroethylene polymer will be minimal.

Abstract: A PTFE composition comprising a dispersion-polymerized polytetrafluoroethylene (PTFE) and a filler, wherein the powder irregular shape ratio of the PTFE is at most 50%, and a PTFE granulated product obtained by granulating the PTFE composition. The composition is produced by jetting high pressure water to a mixture comprising the dispersion-polymerized PTFE and the filler. The dispersion-polymerized PTFE composition and granulated product thus obtained are suitable for molding.

Abstract: A tetrafluoroethylene polymer having high stretchability, a fibrillatable character and a non-melt fabricable quality, which has a standard specific gravity of at most 2.160, and a tensile break strength of from 32.0N (3.26 kgf) to 49.0N (5.0 kgf) or an endothermic ratio of at most 0.15 as calculated from the measurement by differential thermal analysis. The tetrafluoroethylene polymer is suitable for stretching operation after paste extrusion.

Abstract: A composition comprising from 30 to 65 wt % of fine particles of PTFE, and, based on PTFE, from 2 to 12 wt % of C10H21CH(CH3)CH2O(C2H4O)9C3H6OH and at least 0.01 wt % and less than 1 wt % of a polyethylene oxide having an average molecular weight of from 100,000 to 2,000,000.