Aftertreatment of thermally pretreated tetrafluoroethylene...

C - Chemistry – Metallurgy – 08 – F

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402/248, 402/528

C08F 14/26 (2006.01) B29B 13/10 (2006.01) C08F 6/10 (2006.01) C08J 3/00 (2006.01) C08J 3/12 (2006.01)

Patent

CA 1142696

Abstract of the Disclosure In a process for aftertreating thermally presintered polymers of tetrafluoroethylene the optionally comminuted powders are subjected, at temperatures below +80°C, to the action of a gas jet mill. Preferred starting materials are tetrafluoro- ethylene polymers containing a small proportion of a modifying monomer. By the aftertreatment the bulk density and the flow index of the powders are considerably improved without a notice- able disintegration taking place. The aftertreated powders are used in the first place for the manufacture of shaped articles in extrusion devices with automatic feeding means.

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