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

A process for the preparation of olefin polymers, the process comprising:

• polymerising a mixture of ethylene and at least one other α-olefin of 3 or more carbon atoms in the presence of a metallocene complex according to formula I forming an ethylene-olefin copolymer, wherein the metallocene complex optionally is immobilized on a support,
• wherein
• R1 and R2 are independently selected from H, a methyl, ethyl, n-propyl or iso-propyl group, a butyl group, a hexyl group, a cyclohexyl group, or a phenyl group,
• R3 is a methyl, ethyl, n-propyl or iso-propyl group,
• R′ is selected from H, an alkyl group, or an aryl group, and wherein different R′ substituents are optionally connected to form a ring structure,
• B is a 1,2-phenylene bridge,
• Mt is Zr, X is a methyl group, Cl, Br or I, z is the number of X groups and equals the valence of Mt minus 2.