Abstract: A process for producing a stable PVDF latex by emulsion polymerization in the absence of fluorinated surfactant, said latex being stabilized by poly(vinyl alcohol) (PVOH). The process including the steps of charging a polymerization reactor with deionized water and a stabilizer, raising the temperature to 50 to 120° C., feeding VDF to the reactor until the pressure reaches from 100 kPa to 10 MPa, adding an initiator to start the polymerization, continuously feeding VDF to maintain said pressure, and stopping the VDF feed when the desired amount of polymer conversion has been reached.

Abstract: The invention relates to a method of polymerizing at least one monomer comprising a vinylidene fluoride monomer, the method comprising putting in contact the at least one monomer with a polymerization initiator and an oxidizing agent, the polymerization initiator having the formula (I): (RfSO2?)xMx+??(II) wherein Rf is a fluoroalkyl group comprising from 1 to 3 carbon atoms; and Mx+ is chosen from a monovalent cation, or a divalent cation, or a trivalent cation, or a tetravalent cation.

Abstract: The present invention relates to a process for preparing a lithium salt A, comprising step a) of placing in contact a lithium salt B comprising at least one —S(O)2—F group with a compound C of formula (I) R—O—SiR1R2R3 in the presence of a catalyst D to form a mixture of products comprising said lithium salt A comprising at least one group —S(O)2—OR; said catalyst D being a compound with a pKa of greater than 11 measured at 25° C. The present invention also relates to a lithium salt of formula (IIIa), (IIIb), (IIIc), (IIId), (IIIe), (IIIf), (IIIg), (IIIh), (IIIi), (IIIj), (IVa), (IVb), (IVc) or (IVd).

Abstract: The invention relates to a method of polymerizing at least one fluorinated monomer comprising an ethylene bond, the method comprising putting in contact the at least one fluorinated monomer with a polymerization initiator and a chain transfer agent, the chain transfer agent being a polysulfide compound, preferably a disulfide compound. The invention also relates to a telechelic fluoride-based polymer obtained with said method.

Abstract: The invention relates to a method of polymerizing at least one monomer comprising a vinylidene fluoride monomer, the method comprising putting in contact the at least one monomer with a polymerization initiator -and an oxidizing agent, the polymerization initiator having the formula (I): wherein Rf is a fluoroalkyl group comprising from 1 to 3 carbon atoms; and Mx+ is chosen from a monovalent cation, or a divalent cation, or a trivalent cation, or a tetravalent cation.