Patent ID: 7012122

Claim:
Process for the manufacture of polyvinylidene fluoride (PVDF) homopolymer or copolymer comprising synthesizing by radical polymerization of vinylidene fluoride (VDF), and optionally of a comonomer, in aqueous dispersion and in the presence of a transfer agent, of a persulphate as radical initiator, optionally of a surface-active additive and optionally of a paraffin wax, in which: a) sodium acetate is added, either at the start of or during or after the polymerization, b) a potassium alkylsulphonate is optionally added after the polymerization, c) an aqueous PVDF dispersion is obtained, d) the PVDF is collected by atomizing the dispersion obtained in c) with air at a temperature of between 120 and 220° C., the aqueous dispersion obtained in c) not being washed with water before atomising.