Process for preparing filler-containing polytetrafluoroethylene

Details Process for preparing filler-containing polytetrafluoroethylene Process for preparing filler-containing polytetrafluoroethylene

1981-02-18

1984-04-03

Lieberman, Allan

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Processes of preparing a desired or intentional composition...

523334, 524434, 524435, 524436, 524437, 524545, 524904, C08K 324, C08L 2718, C08L 2720

Patent

active

044408790

ABSTRACT:
A process for preparing filler-containing polytetrafluoroethylene fine powder which comprises mixing together an aqueous dispersion of particles of polytetrafluoroethylene and an aqueous dispersion of particles of a filler adsorbed with polyvalent cation at the surfaces so as to be charged positively in the presence of an anionic surfactant and a water-immiscible organic liquid to coagulate the polytetrafluoroethylene particles and the filler particles in combination and recovering the coagulated particles from the resultant dispersion mixture, said filler particles being per se chargeable negatively in water.

REFERENCES:
patent: 3880798 (1975-04-01), Deem et al.
patent: 3915916 (1975-10-01), Leverett
patent: 3980596 (1976-09-01), Leverett
patent: 3980612 (1976-09-01), Gangal
patent: 4138375 (1979-02-01), Berg et al.
patent: 4241137 (1980-12-01), Izumo et al.

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