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Abstract

A process for manufacturing terpolymers by polymerization of VDF (vinylidene difluoride), TrFE (trifluoroethylene), and CFE (1-chloro-1-fluoroethylene) or CTFE (chlorotrifluoroethylene) monomers in the presence of a radical polymerization initiator, characterized in that:

i) an initial mixture of VDF and of TrFE, free of CFE and of CTFE, is fed into an autoclave,ii) the initiator mixed with water is injected into the autoclave so as to achieve, inside the autoclave, a pressure at least equal to 80 bar, in order to form a suspension of VDF and TrFE monomers in water,iii) a secondary mixture constituted of VDF, TrFE and CFE or CTFE is injected into the autoclave, theniv) as soon as the polymerization reaction starts, said secondary mixture is reinjected continuously into the reactor, so as to maintain therein a constant pressure of at least 80 bar.

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First Claim