METHOD OF PREPARING POLYOLEFIN Russian patent published in 1998 - IPC

FIELD: chemistry of polymers. SUBSTANCE: present invention describes method of preparing high molecular weight polyolefin. Highly effective catalyst system comprises cocatalyst, preferably aluminoxane and metellocene of structure formula: $$$ wherein $$$ is Zr or Hf; $$$ and $$$ are alkyl or halogen; $$$ is hydrogen; $$$ is alkyl or aryl, $$$, $$$ is $$$ moro- or multistep chain in which $$$ is also substituted heteroatom, and m+n is 0 or 1. EFFECT: more efficient preparation method. 7 cl