Process for the preparation of a high molecular weight olefin polymer

摘要

A very active catalyst system for olefin polymerization is composed of an aluminoxane and a metallocene of the formula I (I) wherein preferably M1 is Zr or Hf, R1 and R2 are alkyl or halogen, R3 and R4 are hydrogen, R5 and R6 are alkyl or haloalkyl, -(CR8R9)m-R7-(CR8R9)m-is a single-membered or multimembered chain in which R7 may also be a (substituted) hetero atom, and m+n is zero or 1. The catalyst system gives polymers having a high molecular weight and high stereospecificity.