Aqueous dispersions of fluoropolymers
OwnerHermann Bladel, Klaus Hintzer +3inventors
InventorsHermann Bladel, Klaus Hintzer, Gernot Lohr, Werner Schwertfeger, Reinhard A. Sulzbach
Life of this patent
Estimating the term…
Abstract
Fluorine-containing emulsifiers can be removed from fluoropolymer dispersions by adding to the dispersion a non ionic emulsifier, removing the fluorine-containing emulsifier by contact with an anion exchanger and separating the dispersion from the anion exchanger. The resulting dispersions can be upconcentrated and used for coating applications, such as fabric coating and metal coating.
Claims21
Aqueous fluoropolymer dispersion, being essentially free of fluorine-containing emulsifier.
A process for removing fluorine-containing emulsifier from an aqueous fluoropolymer dispersion which comprises adding to the dispersion an effective amount of a nonionic emulsifier to stabilize the dispersion, contacting this stabilized dispersion with an effective amount of an anion exchange resin to essentially remove fluorine-containing emulsifier from the stabilized dispersion and separating the dispersion from the anion exchange resin and optionally, subjecting the so-obtained dispersion to upconcentration.
Dependencies are inferred from the claim text.