Cyclopentadienyl/adamantyl phosphinimine zirconium and hafnium complexes
AssigneeNOVA Chemicals (International) S.A.
InventorsXiaoliang Gao, Charles Carter, P. Scott Chisholm, Janelle Smiley-Wiens, Darryl Morrison, Alva Woo, Cheng Fan, Chia Yun Chang, Frederick Chiu
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Abstract
Provided in this disclosure are zirconium and hafnium complexes that contain 1) a cyclopentadienyl ligand; 2) an adamantyl-phosphinimine ligand; and 3) at least one other ligand. The use of such a complex, in combination with an activator, as an olefin polymerization catalyst is demonstrated. The catalysts are effective for the copolymerization of ethylene with an alpha olefin (such as 1-butene, 1-hexene, or 1-octene).
Claims23
A complex having the formula (PI)(Cp)ML2, wherein:
- I) PI is a phosphinimine ligand defined by the formula:
- where N is a nitrogen atom;
- P is a phosphorus atom;
- each R1 is unsubstituted adamantyl, or substituted adamantyl;
- and R1′ is selected from the group consisting of unsubstituted adamantyl, substituted adamantyl and C1 to C6 hydrocarbyl;
- II) Cp is a cyclopentadienyl-type ligand comprising a 5-membered carbon ring having delocalized bonding within the ring and bound to M, which ring is unsubstituted or may be further substituted;
- III) each L is an activatable ligand;
- and
- IV) M is zirconium or hafnium.
An olefin polymerization catalyst system comprising:
- A) a complex having the formula (PI)(Cp)ML2, wherein:
- I) PI is a phosphinimine ligand defined by the formula:
- where N is a nitrogen atom;
- P is a phosphorus atom;
- each R1 is unsubstituted adamantyl, or substituted adamantyl;
- and R1′ is selected from the group consisting of unsubstituted adamantyl, substituted adamantyl and C1 to C6 hydrocarbyl;
- II) Cp is a cyclopentadienyl-type ligand comprising a 5-membered carbon ring having delocalized bonding within the ring and bound to M, which ring is unsubstituted or may be further substituted;
- III) each L is an activatable ligand;
- and
- IV) M is zirconium or hafnium;
- and
- B) an activator.
Dependencies are inferred from the claim text.