Tetrafluoroethylene fine powder and preparation thereof

Claim 1

A process for obtaining a tetrafluoroethylene resin which comprises polymerizing tetrafluoroethylene in an aqueous medium in the presence of a substantially non-telogenic anionic surfactant present in an amount which maintains colloidal particles of polymerization product in dispersed form, said process being carried out by contacting tetrafluoroethylene in said aqueous medium in the presence of at least one polymerization initiator defined by the formula XMnO 4 , wherein x is a cation selected from hydrogen, ammonium, alkali metal and alkaline earth metal and wherein the XMnO 4 is added optionally as a precharge, and intermittently or continuously, and where the XMnO 4 last addition occurs so that the reaction slows down and the end point is at least 5% longer in comparison with a reaction where initiator addition is continued to the end of the polymerization; said process being carried out at a temperature of between 50°-125° C., and a pressure of between 15 and 40 kg/cm 2 .