Olefin polymerization method using a highly active catalyst havi

Details Olefin polymerization method using a highly active catalyst havi Olefin polymerization method using a highly active catalyst havi

1997-01-21

1998-10-06

Wu, David W.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Polymers from only ethylenic monomers or processes of...

526132, 526134, 526160, 526161, 5261691, 5263484, 5263485, 526351, 526352, C08F 464

Patent

active

058177248

ABSTRACT:
Disclosed is an olefin polymerization method using a highly active catalyst comprising a transition metal selected from metals of Groups IIIA including the lanthanide series, IVA, VA, VIA, VIIA and VIII of the Periodic Table of the Elements, and ligands L.sup.1 and L.sup.2 bonded thereto, wherein a combination of L.sup.1 and L.sup.2 is (1) a combination of ligand L.sup.1 which is a group containing at least one phosphorus-containing group and ligand L.sup.2 which is a ligand having a .sigma.-bond, or a ligand having a .sigma.-bond and a bond selected from at least one .pi.-bond and at least one lone electron pair donative bond; (2) a combination of ligand L.sup.1 which is a 5-membered heterocyclic pentadentate ligand having one or more heteroatoms and ligand L.sup.2 which is a ligand having a .sigma.-bond, or a ligand having a .sigma.-bond and a bond selected from at least one .pi.-bond and at least one lone electron pair donative bond, provided that when the pentadentate ligand contains only one heteroatom, L.sup.2 is a ligand having a .sigma.-bond, or a ligand having a .sigma.-bond and at least one lone electron pair donative bond; and (3) a combination of ligand L.sup.1 which is a trispyrazolyl tridentate ligand and ligand L.sup.2 which is an alkapolyenyl ligand, and wherein each L.sup.1 contains an element of Group VB or Group VIB. By the method of the present invention, a desired olefin polymer can be produced efficiently with a high productivity per unit by weight of the catalyst.

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