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US 5,846,447 AGranted
Process for forming a dispersion of polytetrafluoroethylene
AssigneeE. I. Du Pont de Nemours and Company
InventorRichard P. Beatty
Life of this patent
Estimating the term…
Abstract
A process for forming a dispersion of polytetrafluoroethylene particles in a liquid containing a dispersant by passing the mixture through a plurality of nozzles within a liquid-jet interaction chamber at a pressure of to deagglomerate and stabilize the polytetrafluoroethylene particles.
Claims7
A process for forming a dispersion of dry polytetrafluoroethylene particles in an organic carrier fluid comprising the steps of:
- (a) surface functionalizing the polytetrafluoroethylene particles having an average primary particle size of less than 1 micron with electron beam or gamma irradiation of at least 4 Mrad in the presence of atmospheric oxygen and water or selecting polytetrafluoroethylene particles having an average primary particle size of less than 1 micron that have been subjected to electron beam or gamma irradiation of at least 4 Mrad in the presence of atmospheric oxygen and water to functionalize the particle surface;
- (b) mixing the irradiated particles with the liquid and at least one dispersant in an amount sufficient to stabilize the dispersion to form a mixture;
- (c) passing the mixture, at least once, through a plurality of nozzles within a liquid-jet interaction chamber at a pressure of at least 1000 psi to deagglomerate the polytetrafluoroethylene particles.
Dependencies are inferred from the claim text.