Process for making a fluoropolymer dispersion
AssigneeArkema Inc.
InventorsJames T. Goldbach, Anthony Bonnet, Andrew P. Kahn
Life of this patent
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Abstract
The invention relates to a process to produce a stable fluoropolymer latex using non-fluorinated surfactant with greater thermal stability. The polymerization is run at pressures greater than typically used. The resulting polymer exhibit improved melt color stability as compared to those produced under similar conditions at lower pressures.
Claims19
A process for forming a stable fluoropolymer emulsion comprising a fluoropolymer, the process comprising polymerizing in a reactor, one or more fluoromonomers in an aqueous medium comprising initiator, surfactant, and running the polymerization at a pressure of greater than 800 psi;
- and wherein the surfactant comprises a non-fluorinated non-ionic emulsifiers containing segments of at least one of polyethylene glycol (PEG), polypropylene glycol (PPG), polytetramethylene glycol (PTMG) or a combination thereof, with repeating units between 2 to 200 and wherein the solids level in the stable emulsion produced is at least 33.5 weight percent of fluoropolymer solids.
Dependencies are inferred from the claim text.