Removing volatile components from molten polyamides - by applying vacuum-simultaneously introducing superheated finely divided steam below surface of polyamide

Removing volatile components from molten polyamides - by applying vacuum-simultaneously introducing superheated finely divided steam below surface of polyamide

Volatile components are removed from molten polyamides by placing the polyamide under vacuum, and simultaneously introducing superheated steam in finely-divided form below the surface of the polyamide through a sintered matl. having a pore size of 5-100 mu. Effects highly turbulent mixing of the mol...

Ausführliche Beschreibung

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Bibliographische Detailangaben
Hauptverfasser: HANSEL,WERNER, FREUND,PETER,.DR, WILHELM,FRITZ, ANGERER,DIETER
Format: Patent
Sprache:eng ; ger
Schlagworte:
CHEMISTRY
COMPOSITIONS BASED THEREON
MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONSONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
METALLURGY
ORGANIC MACROMOLECULAR COMPOUNDS
THEIR PREPARATION OR CHEMICAL WORKING-UP
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Beschreibung
Zusammenfassung:Volatile components are removed from molten polyamides by placing the polyamide under vacuum, and simultaneously introducing superheated steam in finely-divided form below the surface of the polyamide through a sintered matl. having a pore size of 5-100 mu. Effects highly turbulent mixing of the molten polyamide and steam, so that matl. exchange is highly intensified. Volatile components are removed efficiently using a low wt. ratio of steam to polyamide.