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US 11,021,554 B2Granted
Transition metal catalysts for olefin polymerization
AssigneeThe Trustees of Princeton University
InventorsBrad P Carrow, Wei Zhang
Life of this patent
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Abstract
In one aspect, a chelating phosphine-phosphonic diamide (PPDA) ligand is described herein for constructing transition metal complexes operable for catalysis of olefin polymerization, including copolymerization of ethylene with polar monomer.
Claims21
A phosphine-phosphonic diamide (PPDA) ligand compound of Formula (I):
- wherein A is selected from the group consisting of alkylene, alkenylene, arylene and heteroarylene and wherein R1, R2, R3, R4, R5 and R6 are independently selected from the group consisting of alkyl, heteroalkyl, cycloalkyl, heterocycloalkyl, aryl, heteroaryl, alkyl-aryl and alkyl-heteroaryl, wherein R1 and R2 optionally form a ring structure and any combination of R3, R4, R5 and/or R6 optionally form a ring structure.
A transition metal complex of Formula (II):
- wherein M is a transition metal, A is selected from the group consisting of alkyl, alkenyl, aryl and heteroaryl and wherein R1, R2, R3, R4, R5 and R6 are independently selected from the group consisting of alkyl, heteroalkyl, cycloalkyl, heterocycloalkyl, aryl, heteroaryl, alkyl-aryl and alkyl-heteroaryl, wherein R1 and R2 optionally form a ring structure and any combination of R3, R4, R5 and/or R6 optionally form a ring structure and wherein R7 is selected from the group consisting of alkyl and aryl and R8 is selected from the group consisting of amine, heteroaryl, monophosphine, halo and sulfoxide and wherein X− is a non-coordinating counter anion.
Dependencies are inferred from the claim text.