Patent ID: 6693152
Filing Date: 2004-02-17
Classification: C08F

Abstract:
Method of making a fluoropolymer comprising repeating units derived from at least one first and at least one second monomer that are different from each other, said first monomer being a fluoroolefin selected from tetrafluoroethylene and/or vinylidene fluoride and said second monomer being at least one comonomer selected from the group consisting of vinyl fluoride, a perfluoro(alkyl vinyl ether) monomer, ethylene, propylene, fluorinated allyl ethers, fluorinated vinyl ethers and vinylidene fluoride, said method comprising an aqueous emulsion polymerization of said first and second monomers in absence of added surfactant, said method being characterized in that a mixture of an oxidizing agent and a reducing agent is used to start the polymerization and wherein there is further added during the polymerization either the oxidizing agent or the reducing agent but not both.