Reducing the dust content of finely divided polyolefins - by forming a suspension heating, separating, washing and drying

Reducing the proportion of particles with dia. below 200 m mu in finely divided polyolefins e.g. polyethylene, comprising particles with dia below 3.5 mm, comprises (1) suspending 1 pbe of the polyolefin, in 2-6 pbw of a water-sol, inert, liq. e.g. ethylene glycol; heating the resulting suspension t...

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Hauptverfasser:	GIERTH, VOLKER, BUECHNER, OSKAR, MUELLER-TAMM, HEINZ, WENDLER, KLAUS
Format:	Patent
Sprache:	eng ; ger
Schlagworte:	AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F,C08G CHEMISTRY COMPOSITIONS BASED THEREON GENERAL PROCESSES OF COMPOUNDING METALLURGY ORGANIC MACROMOLECULAR COMPOUNDS THEIR PREPARATION OR CHEMICAL WORKING-UP WORKING-UP
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creator	GIERTH, VOLKER BUECHNER, OSKAR MUELLER-TAMM, HEINZ WENDLER, KLAUS
description	Reducing the proportion of particles with dia. below 200 m mu in finely divided polyolefins e.g. polyethylene, comprising particles with dia below 3.5 mm, comprises (1) suspending 1 pbe of the polyolefin, in 2-6 pbw of a water-sol, inert, liq. e.g. ethylene glycol; heating the resulting suspension to 2-6.5 degrees C below the melting range of the polymer, maintaining the suspension at that temp. for 5-30, the processing time being of a duration inversely proportional to the working temp; then (2) separating the so-treated polyolefin from the suspension medium; washing with water; and drying. Step (1) is effected under continuous stirring. The resulting dust-free prod. has improved flow characteristics and is free of voids giving mouldings free of cavities.
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subjects	AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F,C08G CHEMISTRY COMPOSITIONS BASED THEREON GENERAL PROCESSES OF COMPOUNDING METALLURGY ORGANIC MACROMOLECULAR COMPOUNDS THEIR PREPARATION OR CHEMICAL WORKING-UP WORKING-UP
title	Reducing the dust content of finely divided polyolefins - by forming a suspension heating, separating, washing and drying
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