MULTISTEP PROCESS FOR THE (CO)POLYMERIZATION OF OLEFINS

MULTISTEP PROCESS FOR THE (CO)POLYMERIZATION OF OLEFINS

A multistep process for the polymerization of one or more olefins comprising a first step of polymerizing one or more of said olefins in the presence of a catalyst of the Ziegler-Natta type, a step wherein the polymer obtained in the first step is contacted with a catalyst system comprising an half-...

Ausführliche Beschreibung

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Bibliographische Detailangaben
Hauptverfasser: RESCONI, LUIGI, BARUZZI, GIOVANNI
Format: Patent
Sprache:eng ; fre ; ger
Schlagworte:
CHEMISTRY
COMPOSITIONS BASED THEREON
COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVINGCARBON-TO-CARBON UNSATURATED BONDS
METALLURGY
ORGANIC MACROMOLECULAR COMPOUNDS
THEIR PREPARATION OR CHEMICAL WORKING-UP
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Beschreibung
Zusammenfassung:A multistep process for the polymerization of one or more olefins comprising a first step of polymerizing one or more of said olefins in the presence of a catalyst of the Ziegler-Natta type, a step wherein the polymer obtained in the first step is contacted with a catalyst system comprising an half-sandwich metallocene compound, followed by a second polymerization step. The amount of homo- or copolymer of olefins produced in the first polymerization step is between 10% to 90% by weight of the total amount of polymer produced.