PROCESS FOR PREPARING OLEFIN POLYMER BY SLURRY LOOP POLYMERIZATION HAVING HIGH POWDER DENSITY

PROCESS FOR PREPARING OLEFIN POLYMER BY SLURRY LOOP POLYMERIZATION HAVING HIGH POWDER DENSITY

The instant invention pertains to a process for preparing an ethylene homo- or copolymer in the presence of a supported chromium catalyst by slurry loop polymerization or copolymerization, whereby the resulting polymer powder has an increased powder density, in which the supported chromium catalyst...

Ausführliche Beschreibung

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Bibliographische Detailangaben
Hauptverfasser: MIHAN, SHAHRAM, KÖLLING, LARS
Format: Patent
Sprache:eng ; fre ; ger
Schlagworte:
CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOIDCHEMISTRY
CHEMISTRY
COMPOSITIONS BASED THEREON
MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVINGCARBON-TO-CARBON UNSATURATED BONDS
METALLURGY
ORGANIC MACROMOLECULAR COMPOUNDS
PERFORMING OPERATIONS
PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
THEIR PREPARATION OR CHEMICAL WORKING-UP
THEIR RELEVANT APPARATUS
TRANSPORTING
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Beschreibung
Zusammenfassung:The instant invention pertains to a process for preparing an ethylene homo- or copolymer in the presence of a supported chromium catalyst by slurry loop polymerization or copolymerization, whereby the resulting polymer powder has an increased powder density, in which the supported chromium catalyst has a chromium content of from 0.01 to 5 wt.-%, based on the element in the finished catalyst, and shows a particle size distribution measured according to ISO 13320-2009 comprising two main fractions one of which having a d 50 of from 15 to 40 µm and the other having a d 50 of from 45 to 80 µm said catalyst being further characterized by the fact that less than 10% wt of its catalyst particles has diameter lower than 20 µm.