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US 6,486,277 B1Granted
Zwitterionic transition metal compound which contains boron
AssigneeTargor GmbH
InventorsGerhard Erker, Gerald Kehr, Jörg Schottek, Roland Kratzer
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Abstract
A boron-containing zwitterionic neutral transition metal compound which can advantageously be used for the polymerization of olefins is described. Here, the use of aluminoxanes, such as methylaluminoxane (MAO), as a cocatalyst can be dispensed with and a high catalyst activity and a good polymer morphology can nevertheless be achieved.
Claims7
A zwitterionic transition metal compound of the formula I
- where
- M1 is titanium, zirconium of hafnium,
- n is 2 or 3,
- L is a substituted cyclopentadienyl ring or a substituted indenyl ring, it also being possible for two or more substituents of the indenyl ring together to form a ring system and for the cyclopentadienyl and indenyl rings to be unbridged or bridged by Z, with
- Z bridging groups of the formula M2R2R3, where M2 is carbon, silicon, germanium or tin and R2 and R3 are identical or different C1-C10-alkyl, C6-C14-aryl or trimethylsilyl,
- X is an aromatic or nonaromatic heterocyclic structure,
- Y is a C1-C40-hydrocarbon radical which may be halogenated with halogens,
- f is 1,
- A is boron,
- R1 are identical or different and are each a perfluorinated C1-C40-alkyl or aryl group, and
- m is 2.
8 more elements
Dependencies are inferred from the claim text.