Method for producing high melting-point polyolefins
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United States of America Patent
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Feb 20, 2001
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N/A
app pub date -
Dec 30, 1998
filing date -
Jul 5, 1996
priority date (Note) -
Expired
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Abstract
High-melting polyolefins can be prepared in bulk, in solution, in suspension or in the gas phase, the catalysts employed being metallocene compounds or .pi. complex compounds of the formula ##STR1## in which CpI and CpII represent carbanions having a cyclopentadienyl-containing structure, .pi.I and .pi.II represent charged or electrically neutral .pi. systems, D represents a donor atom and A represents an acceptor atom, where D and A are linked by a reversible coordinate bond such that the donor groups assumes a positive (part) charge and the acceptor group assumes a negative (part) charge, M represents a transition metal of sub-group III, IV, V or VI of the Periodic Table of the Elements (Mendeleev), including the lanthanides and the actinides, X denotes one anion equivalent and n denotes the number zero, one, two, three or four, depending on the charge of M.
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