Process for preparing polyolefines

摘要

Polyolefins having a high molecular weight, an appropriate molecular weight distribution and a relatively narrow composition distribution are prepared in high activity. The polymerization of an olefin or olefins is performed in the presence of a catalyst comprising a catalyst component and a modified organoaluminum compound, the catalyst component being prepared by mutually contacting (1) a compound of the general formula Me1R1nX14-n and (2) an alkali metal salt of cyclopentadiene or indene and optionally (3) a compound of the general formula Me2R2mX23-m, and the modified organoaluminum compound and water and containing Al-O-Al bond(s).