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US 2004/0167272 A1Published application
Purification process of thermoprocessable tetrafluoroethylene copolymers
AssigneeAusimont S.p.A.
InventorsHua Wu, Vincenzo Arcella
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Abstract
A purification process of thermoprocessable tetrafluoroethylene (TFE) copolymers comprising the following steps: A) the polymer latex is transformed into gel form, under mechanical stirring, by addition of an acid electrolyte having pH values≦2; B) washing of the polymer gel with aqueous solutions having pH from 1 to 7.
Claims17
A purification process of thermoprocessable tetrafluoroethylene (TFE) copolymers comprising the following steps:
- A) the polymer latex of thermoprocessable tetrafluoroethylene (TFE) copolymers obtained by the polymerization in dispersion or aqueous emulsion, is transformed into gel form, under mechanical stirring, by addition of an acid electrolyte having pH values≦2, preferably in the range 0.4-1.6;
- B) washing of the polymer gel with acid aqueous solutions or neutral aqueous solutions having ph from 1 to 7.
Dependencies are inferred from the claim text.