Patent ID: 7074862
Filing Date: 2006-07-11
Classification: C08F

Abstract:
1. 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, vinylidene fluoride, or combinations thereof and said second monomer being at least one comonomer selected from the group consisting of vinylfluoride, a perfluoroalkyl vinyl 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 said aqueous polymerization is carried out in the presence of a chain transfer agent or mixture of chain transfer agents selected from the group consisting of alkanes and dialkyl ethers.