| abstract |
Thermoplastic elastomers can be prepared by (co)polymerization of monomers from the group consisting of C2-C8-alpha-olefins, C4-C15-diolefins and other monomers in the bulk, solution, slurry or gas phase, the catalysts employed being metallocene compounds or the pi complex compounds of the formulaein whichCpI and CpII represent carbanions having a cyclopentadienyl-containing structure,piI and piII represent charged or electrically neutral pi systems,D represents a donor atom andA represents an acceptor atom,where D and A are linked by a reversible coordinate bond such that the donor group assumes a positive (part) charge and the acceptor group assumes a negative (part) charge,M represents a transition metal of sub-group III, IV, V or VI of the Periodic Table of the Elements (Mendeleev), including the lanthanides and actinides,X denotes one anion equivalent andn denotes the number zero, one, two, three or four, depending on the charge of M. |