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US 11,712,686 B2Granted
Heterobimetallic catalysts and site-differentiated ligands for preparation thereof
AssigneeUniversity of Houston System
InventorsLoi Hung Do, Zhongzheng Cai, Thi Tran, Dawei Xiao
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Abstract
Phosphine phosphonate and phenoxyphosphine ligands bearing polyethylene glycol (PEG) chains are used as described herein to produce heterobimetallic catalysts. The ligands can be metallated selectively with palladium or nickel and secondary metal ions to provide well-defined heterobimetallic compounds. These heterobimetallic complexes exhibit accelerated reaction rates and greater thermal stability in olefin polymerization compared to other catalysts.
Claims1
A method for catalyzing copolymerization of ethylene and polar olefins, comprising:
- combining ethylene and polar olefins with a heterobimetallic catalyst, wherein the heterobimetallic catalyst has a structure of:
- wherein A is Pd or Ni, Ph is a phenyl group, PMe3 is trimethylphosphine, and M is Li, Na, or K,
- whereby the ethylene and polar olefins undergo copolymerization.
Dependencies are inferred from the claim text.