| abstract |
Thermoplastic elastomers can be produced by (co)polymerising monomers from the group of C2-C8-α-olefins, C4-C15-dioledins and other monomers in the solid phase, in solution, as slurry or in the gas phase where metallocen compounds or π-complex compounds of formulas (I) or (XIII), are used as catalysts, in which CpI and CpII represent carbanions with a structure containing cyclopentadienyl, π I and π II represent charged or electrically neutral π-systems, D represent a donator atom and A an acceptor atom, wherein D and A are linked by a reversible, coordinate bond such that the donator group adopts a positive (partial) charge and the acceptor group a negative (partial) charge, M stands for a transition metal of the IIIrd, IVth, Vth or VIth subgroup of the periodic system of elements including lanthanides and actinoides, X stands for an anion equivalent and n, depending on the charge of M, is 0, 1, 2, 3 or 4. |