Patent ID: 8119750

Claim:
A process comprising polymerizing tetrafluoroethylene in an aqueous emulsion in the presence of a non-telogenic surfactant having an anionic portion with the general formula (I): R f —O-L-CO 2 — (I) wherein R f is selected from a partially fluorinated alkyl group, a perfluorinated alkyl group, a partially fluorinated alkyl group interrupted by one or more oxygen atoms, and a perfluorinated alkyl group interrupted by one or more oxygen atoms, wherein R f has from 1 to 10 carbon atoms; and L is an alkylene group having the general formula (CX 2 ) n wherein each X is independently selected from R f , fluorine, and hydrogen and n is selected from 2 to 5, with the proviso that only one of R f or L must contain at least one unit selected from a —CH 2 — unit and a —CHF— unit.