Polymerization of ethylene using supported bis-(cyclopentadienyl)chromium(ii)catalysts
Abstract
Abstract SUPPORTED BIS - (CYCLOPENTADIENE) CHROMIUM (II) CATALYSTS WHICH ARE FORMED WHEN A BIS-(CYCLOPENTADIENYL) CHROMIUM (II() COMPOUND IS ADSORBED ON AN INORGANIC OXIDE HAING A HIGH SURFACE AREA, HAVE BEEN FOUND TO BE UNUSUALLY EFFECTIVE CATALYSTS FOR THE POLYMERIZATION OF ETHYLENE OVER A WIDE RANGE OF REACTION CONDITIONS. THE ACTIVITY OF THESE CATALYST CAN BE MARKEDLY INCREASED IN THE PRESENCE OF HYDROGEN AND THE RELATIONSHIP OF THE MELT INDEX OF THE POLYMER TO THE HYDROGEN AND ETHYLENE CONCENTRATIONS USED IN THE POLYMERIZATION REACTION HAS BEEN FOUND TO BE GOVERNED BY THE EQUATION WHERE MI REPRESENTS THE MELT INDEX OF THE POLYETHYLENE, A REPRESENTS THE HYDROGEN CONCENTRATION IN MOLE PERCENT B REPRESENTS THE ETHYLENE CONCENTRATION IN MOLE PERCENT AND K AND C REPRESENTS EMPIRICALLY-DETERMINED CONSTANTS.
Inventors
- 👤 G Karapinka
Bibliographic Details
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