Donor/Acceptor Metallocenes: A New Structure Principle in Catalyst Design.
Suitable as highly effective polymerization catalysts is the new class of donor/acceptor metallocenes in which the rotation of the two pi ligands is restricted through the formation of a dative D(+)-->A(-) bond (see picture). Specifically optimized substitution patterns yield excellent properties for the synthesis of high-melting, highly crystalline thermoplastic materials, amorphous thermoplastic materials with high glass transition temperatures as well as polyolefin elastomers with low glass T(g).
Ostoja Starzewski KA
Bayer AG, Zentrale Forschung, Wissenschaftliches Hauptlaboratorium, D-51368 Leverkusen (Germany).
Kelly
WM
Stumpf
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Freitag
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