{Cyclopentadienyl/Fluorenyl}-Group 4 ansa-metallocene Catalysts for Production of Tailor-made Polyolefins

The development of new metallocene-based polymerization catalysts and innovative processes derived thereof still constitutes a challenge for the manufacturing of polyolefinic materials with tailored properties (e. g. particular microstructure or topology, ultra-high molecular weight, high melting transition, and their combinations) for contemporary commercial applications. This personal account summarizes our continuing endeavors to advance the family of industry-relevant stereoselective propylene polymerization catalysts based on C-1-symmetric group 4 ansa-metallocenes incorporating multi-substituted fluorenyl-cyclopentadienyl {Cp/Flu} ligands. Within the framework of this project, valuable structural and catalytic data, harvested both for neutral metallocenes and for metallocenium ion-pairs, have been used for rational design of more efficient catalytic systems, reluctant towards side reactions, and for providing new stereoregular value-added polymer materials.

Automated summary

The challenge of developing new metallocene-based polymerization catalysts for manufacturing polyolefinic materials with specific properties continues. By focusing on C-1-symmetric group 4 ansa-metallocenes with multi-substituted fluorenyl-cyclopentadienyl ligands, valuable structural and catalytic data have been used to design more efficient catalytic systems and provide new stereoselective value-added polymer materials.