Ultra-clean fluoropolymers
Assignee3M Innovative Properties Company
InventorsWerner M.A. Grootaert, Georg Burkard, William D. Coggio, Klaus Hintzer, Bernhard Hirsch, Robert E. Kolb, Albert Killich, Gernot Loehr
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Abstract
High purity fluoropolymers are obtained by the emulsion polymerization process, removing essentially all ions and coagulating the polymer essentially without adding ions. These polymers are useful in the field of electronic devices.
Claims16
A fluoropolymer obtained by a process comprising:
- (a) polymerizing one or more fluoromonomers by the aqueous emulsion polymerization process,
- (b) removing from the so-obtained latex essentially all ions different than NH4+, H+ and OH− by contacting the latex with cation and anion exchange resins and (c) coagulating the fluoropolymer essentially without addition of ions.
A fluoropolymer which is essentially free of extractable ions other than NH4+.
An ultraclean emulsion polymerized fluoropolymer comprising interpolymerized units derived from one or more fluoroolefin monomers, said fluoropolymer being essentially free of ions other than NH4+, H+ and OH−.
Dependencies are inferred from the claim text.