Fluoropolymer Produced by Aqueous Polymerization Using Dispersed Particulate of Fluorinated Ionomer Produced In Situ
AssigneeE. I. Du Pont de Nemours and Company
InventorsRalph Munson Aten, Kenneth Wayne Leffew, Ralph Birchard Lloyd, Charles Joseph Noelke
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Abstract
A process for making an aqueous dispersion of fluoropolymer particles by polymerizing in a first polymerization step at least one fluorinated monomer having an ionic group in an aqueous polymerization medium in the presence of initiator, the polymerizing providing dispersed particulate of fluorinated ionomer, and polymerizing in a second polymerization step at least one fluorinated monomer in the aqueous polymerization medium in the presence of the dispersed particulate of fluorinated ionomer and initiator to form the aqueous dispersion of particles of fluoropolymer.
Claims29
A process for making an aqueous dispersion of fluoropolymer particles comprising:
- polymerizing in a first polymerization step at least one fluorinated monomer having an ionic group in an aqueous polymerization medium in the presence of initiator, said polymerizing providing dispersed particulate of fluorinated ionomer;
- polymerizing in a second polymerization step at least one fluorinated monomer in said aqueous polymerization medium in the presence of said dispersed particulate of fluorinated ionomer and initiator to form the aqueous dispersion of particles of fluoropolymer.
Dependencies are inferred from the claim text.