Amorphous copolymers of tetrafluoroethylene and hexafluoropropylene
AssigneeE. I. Du Pont de Nemours and Company
InventorRichard Alan Morgan
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Abstract
Tetrafluoroethylene polymer resin is isolated from aqueous dispersion by first freezing the dispersion, followed by thawing the dispersion which enables removal of the water and water soluble impurities from the resin particles.
Claims7
A process for isolating non-fibrillatible tetrafluoroethylene copolymer resin from aqueous dispersion produced by dispersion polymerization, comprising first freezing said dispersion to form frozen dispersion, then thawing said frozen dispersion to form thawed frozen dispersion, and then separating said resin from liquid of said thawed frozen dispersion.
A process for isolating non-fibrillatible tetrafluoroethylene copolymer resin from aqueous dispersion produced by dispersion polymerization, consisting essentially of first freezing said dispersion to form frozen dispersion, then thawing said frozen dispersion, and separating said resin from liquid of the resultant thawed frozen dispersion.
Dependencies are inferred from the claim text.