| 主权项 |
1. A process for preparing a fluoropolymer in an aqueous reaction medium, comprising:
a) forming an aqueous emulsion comprising at least one alkyl sulfate surfactant and one or more monomer(s), wherein said monomer or all said monomers are fluoromonomers selected from the group consisting of vinylidene fluoride (VIDF or VF2), tetrafluoroethylene (TFE), trifiuoroethylene, chlorotrifluoroethylene (CITE), hexafluoropropene (HFP), vinyl fluoride, hexafluoroisobutylene, perfluorobutylethylene (PFBF), pentafluoropropene, 3,3,3-tri fluoro-1-propene, 2-trifluoromethyl-3,3,3-trifluoropropene, fluorinated vinyl ethers, fluorinated allyl ethers, fluorinated dioxoles, 1,2,3,3,3-pentafluoropropene, 3,3,3,4,4-pentaftuoro-1-butene, and the combinations; b) initiating polymerization of said fluoromonomers, and c) introducing at least one alkyl sulfate surfactant to the aqueous reaction medium after polymerization and during a finishing stage to separate the fluoropolymer by floatation; wherein no fluorinated surfactant is present during the polymerization. |
