Patent ID: 6214953
Filing Date: 2001-04-10
Classification: C08F,Y10S

Abstract:
A process for preparing an olefinic polymer by polymerizing an olefinic monomer and, optionally, a comonomer in an aliphatic hydrocarbon solvent in the presence of a supported catalyst(s) comprising a modified metallocene(s) and an alkylaluminoxane(s) supported on a carrier prepared in the same aliphatic hydrocarbon solvent as employed in the olefin polymerization, the modified metallocene being derived from a metallocene of formula(I) by introducing at least one C.sub.5-20 alkyl substituent into a .pi.-ligand, C.sub.1-4 alkylene bridge or silicon bridge thereof, to improve the solubility of the metallocene catalyst, and the alkylaluminoxane having a repeating unit of formula(II): ##STR6##wherein:M is Ti, Zr or Hf;X is a halogen, or a C.sub.1-3 alkyl group;L.sup.1 and L.sup.2 are each a .pi.-ligand selected from the group consisting of cyclopentadienyl, indenyl, fluorenyl and derivatives thereof, and are optionally linked together by a C.sub.1-4 alkylene bridge or by a silicon bridge;m is an integer of 2 or more; andR.sup.1 is a C.sub.1-20 alkyl group.