Process for the manufacture of thermally stable PVDF

Details Process for the manufacture of thermally stable PVDF Process for the manufacture of thermally stable PVDF

2006-03-14

2006-03-14

Wu, David W. (Department: 1713)

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Polymers from only ethylenic monomers or processes of...

C526S242000, C526S225000, C526S089000, C524S545000

Reexamination Certificate

active

07012122

ABSTRACT:
The present invention relates to a process for the manufacture of PVDF homopolymer or copolymer 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 atomizing.

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