OLEFIN POLYMERIZATION CATALYST Russian patent published in 1998 - IPC

FIELD: chemistry of polymerization. SUBSTANCE: olefin polymerization catalyst comprises transition metal selected from group IIIA metals including lanthanides of groups IVA, VA, VIA, VII A and VIII of Periodic Table, and ligands L¹ and L² associated therewith where (1) combination of ligand L¹ and L² which is group containing at least one phosphorus containing group of ligand L¹, whish is ligand L², having σ-bond, or ligand having σ-bond and bond selected from at least one π-bond and at least one electron donor bond formed by free electron pair and (2) combination of ligand L¹, which is 5-membered heterocyclic pentadentate ligand having one or more heteroatoms, and ligand L², which is ligand having σ- bond, or ligand having σ-bond and bond selected from at least one π-bond and at least one electron donor bond formed by free electron pair provided that when pentadentate ligand contains only one heteroatom, L² is ligand having σ-bond, or ligand having σ-bond and at least one electron donor bond formed by free electron pair; (3) combination of ligand L¹, which is tripyrazolyl-tridentate ligand, and ligand L², which is alkapolyenyl ligand and each L¹ contains group VB or group VIB group element. The catalyst has exceedingly high catalyst activity with respect to olefin polymerization reaction as compared with ordinary olefin polymerization catalyst. EFFECT: improved properties of olefin polymerization catalyst. 8 cl, 3 tbl