Patent ID: 7691936

Claim:
A process for obtaining the fine powders of fluoropolymers substantially fluorinated surfactant free, comprising an anionic polyelectrolyte, wherein the process comprises the following steps: a) addition of an anionic polyelectrolyte to the fluoropolymer dispersion containing fluorinated surfactants b) contact of the dispersion obtained in a) with an anionic exchanger; b1) separation of the dispersion from the anionic exchanger and recovery of a dispersion substantially fluorinated anionic surfactant free; c) optional dilution of the dispersion obtained in b1) with water; stirring of the dispersion and optional addition of a destabilizing electrolyte for obtaining aggregates/gels; granulation (coagulation) of the aggregates/gels by stirring, and separation of the fine powder of fluoropolymer from water by flotation; d) optionally, washing with water; e) drying of the fine powder.