Norbornene, metallocene-catalyzed

Development of a reduced-order model for metallocene-catalyzed ethylene-norbornene copolymerization reaction... 

Bergstrom, C. H. Sperhch, B. R. Ruotoistenmaki, J. Seppala, J. V. Investigation of the microstructure of metallocene-catalyzed norbornene-ethylene copolymers using NMR spectroscopy. J. Polym. ScL, Part A.- Polym. Chem. 1998, 36, 1633-1638. 

BF Goodrich s patents US 5,569,730 (29 Oct 1996) and US 5,571,881 (5 Nov 1996) further erode the mystique of metallocene catalysts in making specially polyolefins, specifically for norbornene-functional monomers. Unique catalyst systems that catalyze the insertion of chain-transfer agents exclusively at a terminal end of a polymer chain are used to produce addition polymers from norbornene-functional monomers. These catalyst systems, in common with DuPont s, are based on nickel or palladium. There are two noteworthy factors firstly, the nickel or palladium can be present as simple compounds such as the bromides, oxides, acetylacetonates, or 2-ethylhexanoates secondly, and perhaps more surprisingly, these catalysts are activated by the same activators as are the metallocenes. 

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