OLEFIN POLYMERIZATION CATALYST

摘要

An olefin polymerization catalyst containing a novel transition metal compound composed of at least one transition metal selected from the group consisting of Ti, Zr and Hf and at least two ligands, one of which is a group having a cyclopentadienyl skeleton and the other(s) of which is a monovalent bidentate anionic ligand containing an element selected from the group consisting of O, S, Se and Te and one selected from the group consisting of N, S, Se and Te as coordinating atoms through which the ligand is coordinated with the transition metal, one of the latter ligands being optionally bonded to the group having a cyclopentadienyl skeleton through a crosslinking group; and a process for efficiently preparing an olefin homo- or copolymer with this catalyst. The polymerization of one or more olefins with the above catalyst can give a homopolymer having a narrow molecular weight distribution or a copolymer having a narrow molecular weight distribution and a uniform composition, and these homo- and copolymers are excellent in impact strength, stress cracking resistance, transparency, heat sealability at low temperature and blocking resistance and are advantageous by virtue of their low stickiness and extractible content.