Ausimont S.p.a.

Solvay Solexis S.p.a.

Hua Wu

Vincenzo Arcella

Francesco Morandi

Valery Kapeliouchko

Stefano Ferrero

Giovanna Palamone

A purification process of thermoprocessable tetrafluoroethylene (TFE) copolymers comprising the following steps:

Purification process of thermoprocessable tetrafluoroethylene copolymers

Tetrafluoroethylene (TFE) thermoprocessable copolymer microspheres having a substantially spherical shape for at least 95% by weight, the average size of the microspheres being in the range 25 &mgr;m and 2 mm, the bulk density being in the range 0.5 and 1.1 g/cm .

Tetrafluoroethylene thermoprocessable copolymer microspheres

Process for obtaining non thermoprocessable fine powders of homopolymer or modified PTFE

Coagulation process of PTFE fine powders

A rotating stirring device, particularly for mixing heterogeneous systems in mechanical stirred reactors, is fit to be joined to a drive shaft coaxial with respect to the device rotation axis. The device includes a plurality of extended and substantially C-shaped stirring elements symmetrically arranged with respect to the rotation axis and joined to each other at respective ends corresponding with the rotation axis. Such a device permits a very efficient material exchange among different phases to be obtained and to remain substantially constant with an increase in the volume of the mass being stirred. The device is also characterized by a high mixing homogeneity and particularly low shear stress values.

Rotating stirring device

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Milan, Italy

Hua Wu