Method of agglomerating polytetrafluoroethylene powder

Details Method of agglomerating polytetrafluoroethylene powder Method of agglomerating polytetrafluoroethylene powder

1977-07-08

1979-03-06

White, Robert F.

Plastic and nonmetallic article shaping or treating: processes

Forming articles by uniting randomly associated particles

Agitating to form larger particles

264122, 264127, B01J 214

Patent

active

041431103

ABSTRACT:
Finely ground polytetrafluoroethylene molding powder with or without a filler is subjected to high speed agitation in the presence of a medium consisting essentially of water and a hydrophobic organic liquid at a ratio of 0.5 to 1 liter per 1 Kg of the resin to agglomerate it. Hydrophobic organic liquids mean organic liquid which dissolve less than 15 wt. % in water at the temperature of agglomeration.
The volumetric ratio of the organic liquid to water is in a range of 2 to 1/2.
The agglomerated product having narrow particle size distribution and high bulk density and free flowing property can be obtained by the agitation for short time.

REFERENCES:
patent: 3265679 (1966-08-01), Black et al.
patent: 3882217 (1975-05-01), Banham et al.

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