C - Chemistry – Metallurgy – 08 – J
Patent
C - Chemistry, Metallurgy
08
J
18/946
C08J 3/12 (2006.01)
Patent
CA 1184728
- 1 - Abstract of the disclosure: A process for the continuous agglomeration of granular tetrafluoroethylene polymer powders which cannot be processed from the melt to give molding powders having a high bulk density, an improved powder flow and particle stability and a narrow particle size distribution is described. In this process, the powder to be agglomer- ated is first introduced uniformly into a pretreatment stage and is dispersed and pre-agglomerated in this stage in the liquid agglomeration medium, composed of water and an organic liquid capable of wetting polytetrafluoro- ethylene, is then agglomerated to the desired average particle diameter in an agglomeration stage and is finally treated further in an after-treatment stage in order to develop the final shape of the particles. Finally, the powder is separated from the liquid medium and is dried. This makes it possible to obtain, in an economical manner and with excellent processing properties, high-grade agglomerated molding powders of such tetra- fluoroethylene polymers, in particular of such polymers which have been modified with small quantities of per- fluoro-(alkyl-vinyl) ethers.
410946
Burgstaller Gottfried
Kuhls Jurgen
Weiss Eduard
Bereskin & Parr Llp/s.e.n.c.r.l.,s.r.l.
Dyneon Gmbh
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