| abstract |
The present invention is a catalyst composition for olefin polymerization and copolymerization comprising a complex of Ti, V, Zr or Hf with a bidentate coordination ligand or a tridentate ligand and a promoter mixture containing dialkylaluminum halide and dialkylmagnesium It is about. The bidentate coordination ligand is represented by the general formula ZRZ or ZRWRZ, wherein R is an alkylene, cycloalkylene, arylene or alkylarylene group; W is CH 2 , O, S, NR 'or SiR' 2 , and R 'is an alkyl or aryl group; Z is an O, S, NH or C (= 0) -O group. Tridentate coordination ligands are represented by the formula Z- (RZ) -Z or Z- (RU) -Z, wherein R is an alkylene or arylene group; Z and U are different and are O, S, NH or C (= 0) -O groups. |