| abstract |
(57) Abstract: Catalyst for olefin polymerization and copolymerization, comprising a complex of Ti, V, Zr or Hf with a bidentate or tridentate ligand and a cocatalyst mixture comprising a dialkylaluminum halide and a dialkylmagnesium Composition. Bidentate ligand has the general formula: Z-R-Z or Z-R-W-R- Z [R is an alkylene, cycloalkylene, arylene or alkylarylene group; W is CH 2, O, S, N- R ′ or SiR ′ 2 (R ′ is an alkyl or aryl group); and Z is an O, S, NH group or C (＝ O) —O group. The tridentate ligand has the formula: Z- (R-Z) -Z or Z- (R-U) -Z [R is an alkylene or arylene group, unlike Z and u, O, S, NH Or C (= O) -O]. |