Concentration effects of methylalumoxane, zirconocene dichloride and trimethylaluminum in ethylene polymerization

Bernhard Rieger; Christoph Janiak

doi:10.1002/apmc.1994.052150104

Concentration effects of methylalumoxane, zirconocene dichloride and trimethylaluminum in ethylene polymerization

Bernhard Rieger, Christoph Janiak

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Abstract

A quantitative study was carried out on the homogeneous zirconocene dichloride/methylalumoxane/trimethylaluminum (Cp₂ZrCl₂/MAO/TMA) catalyst system in ethylene polymerization. The effects of variation of the Al_MAO/Zr ratio, absolute Zr concentration, and addition of TMA on ethylene polymerization activity and polymer properties were investigated. The polymerization profiles for small Al_MAO/Zr ratios and the changes with the Zr concentration are explained with a complexation equilibrium for the active homogeneous complex and with the change to a heterogeneous catalyst upon polymer precipitation. Good polymer productivities can be achieved at Al_MAO/Zr < 1000 when working at Zr concentrations between 10⁻⁴ and 10⁻⁵ mol/l with addition of TMA (Al_MAO/Al_TMA≈ 1.4).

Original language	English
Pages (from-to)	35-46
Number of pages	12
Journal	Die Angewandte Makromolekulare Chemie
Volume	215
Issue number	1
DOIs	https://doi.org/10.1002/apmc.1994.052150104
State	Published - Feb 1994
Externally published	Yes

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title = "Concentration effects of methylalumoxane, zirconocene dichloride and trimethylaluminum in ethylene polymerization",

abstract = "A quantitative study was carried out on the homogeneous zirconocene dichloride/methylalumoxane/trimethylaluminum (Cp2ZrCl2/MAO/TMA) catalyst system in ethylene polymerization. The effects of variation of the AlMAO/Zr ratio, absolute Zr concentration, and addition of TMA on ethylene polymerization activity and polymer properties were investigated. The polymerization profiles for small AlMAO/Zr ratios and the changes with the Zr concentration are explained with a complexation equilibrium for the active homogeneous complex and with the change to a heterogeneous catalyst upon polymer precipitation. Good polymer productivities can be achieved at AlMAO/Zr < 1000 when working at Zr concentrations between 10−4 and 10−5 mol/l with addition of TMA (AlMAO/AlTMA≈ 1.4).",

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doi = "10.1002/apmc.1994.052150104",

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T1 - Concentration effects of methylalumoxane, zirconocene dichloride and trimethylaluminum in ethylene polymerization

AU - Rieger, Bernhard

AU - Janiak, Christoph

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N2 - A quantitative study was carried out on the homogeneous zirconocene dichloride/methylalumoxane/trimethylaluminum (Cp2ZrCl2/MAO/TMA) catalyst system in ethylene polymerization. The effects of variation of the AlMAO/Zr ratio, absolute Zr concentration, and addition of TMA on ethylene polymerization activity and polymer properties were investigated. The polymerization profiles for small AlMAO/Zr ratios and the changes with the Zr concentration are explained with a complexation equilibrium for the active homogeneous complex and with the change to a heterogeneous catalyst upon polymer precipitation. Good polymer productivities can be achieved at AlMAO/Zr < 1000 when working at Zr concentrations between 10−4 and 10−5 mol/l with addition of TMA (AlMAO/AlTMA≈ 1.4).

AB - A quantitative study was carried out on the homogeneous zirconocene dichloride/methylalumoxane/trimethylaluminum (Cp2ZrCl2/MAO/TMA) catalyst system in ethylene polymerization. The effects of variation of the AlMAO/Zr ratio, absolute Zr concentration, and addition of TMA on ethylene polymerization activity and polymer properties were investigated. The polymerization profiles for small AlMAO/Zr ratios and the changes with the Zr concentration are explained with a complexation equilibrium for the active homogeneous complex and with the change to a heterogeneous catalyst upon polymer precipitation. Good polymer productivities can be achieved at AlMAO/Zr < 1000 when working at Zr concentrations between 10−4 and 10−5 mol/l with addition of TMA (AlMAO/AlTMA≈ 1.4).

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Concentration effects of methylalumoxane, zirconocene dichloride and trimethylaluminum in ethylene polymerization

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