Patent ID: 7253240

Claim:
A process comprising polymerizing tetrafluoroethylene wherein polymerizing is carried out in the presence of a saturated, practically non-water-soluble organic fluorinated compound having 2 to 10 carbon atoms at a partial pressure of the compound, and wherein the organic fluorinated compound has a water solubility of 1×10 −3 to 4×10 −3 mol/(1 bar) and is a saturated fluorinated hydrocarbon that comprises hydrogen atoms and the partial pressure of the organic fluorinated compound is between 2.5 mbar and 0.5 bar, and wherein the polymerizing is an explosion-free aqueous emulsion polymerization and leads to polytetrafluoroethylene that has a SSG density (ASTM D 1457-66) of less than 2.20 g/cm 3 and is not melt-processable, and further wherein the organic fluorinated compound exhibits practically no effective regulator activity in water.