1,2-phenylene bridged 1-indenyl-2-indenyl metallocene complexes for olefin polymerisation

Abstract

The invention relates to a metallocene complexes according to formula (I), (I) wherein R₁ and R₂ are independently selected from H, an alkyl or an aryl group, wherein R₃ is a C1-C10 alkyl group, wherein R′ is selected from H, an alkyl group, an aryl group and wherein different R′ substituents can be connected to form a ring structure and wherein B is a 1,2 phenylene bridging moiety, which can be optionally substituted, wherein Mt is selected from Ti, Zr and Hf, X is an anionic ligand, z is the number of X groups and equals the valence of Mt minus 2. The invention also relates to a catalyst comprising the reaction product of the metallocene complex and a cocatalyst. Further the invention relates to a (co)polymerisation process of olefinic monomers.

Description

[0001]The invention relates to substituted 1,2-phenylene bridged 1-indenyl 2-indenyl metallocene complexes, a catalyst comprising the substituted metallocene complex, a process for the preparation of olefin polymers in the presence of substituted metallocene complexes, the use of the olefin polymers for making articles and articles comprising an olefin polymer.[0002]Metallocene complexes together with a cocatalyst form catalysts that are widely used for olefin polymerisation. In general, the metallocene complexes are known to have only one active polymerisation center and are often referred to as single site catalysts or discrete catalysts to distinguish them from non-single site catalysts like for instance Ziegler-type catalysts. The presence of one active center is believed to result in polymers having a narrow molecular weight distribution (MWD) and narrow compositional distribution for copolymers of different olefins. An advantage of metallocene catalysts is their high activity ...

AI Technical Summary

Benefits of technology

[0010]The metallocene complex according to the invention surprisingly can copolymerise ethylene with alpha olefins in a high yield with a very high 1-hexene reactivity and a very high molecular weight. This copolymerisation can take place in the presence of a cocatalyst and under suitable polymerisation conditions.

Problems solved by technology

The combination of high comonomer reactivity as well as high molecular weight is a challenging target for developing commercially applicable metallocene catalysts.

These metallocene catalysts result in polymers having a low molecular weight.

Images