Patent ID: 6723812
Filing Date: 2004-04-20
Classification: C08F

Abstract:
A continuous process for the manufacture of PVDF homopolymer or copolymer, wherein a comonomer comprises a vinyl group polymerizable by free radicals and at least one fluorine atom, a fluoroalkyl group or a fluoroalkoxy group directly attached to this vinyl group, said process comprising:(a) introducing a flow of VF2, optionally the comonomer, and a radical initiator into a reactor maintained at a pressure of 300 bar-3000 bar, the reactor comprising at least 90% by weight VF2, optionally the comonomer, and PVDF; (b) removing at least a portion of the reaction mixture from (a) and introducing into a separator; (c) recovering molten PVDF in the separator and purging continuously; (c1) optionally introducing the flow of PVDF from (c) into a device to make granules; and (d) recovering VF2 and optionally the comonomer in the separator and recycling into (a).