| abstract |
Cycloolefin copolymers for industrial applications, with the exception of the use for optical data memories, can be prepared by copolymerization of monomers from the group consisting of cyclic olefins, α-olefins having 2 or more C atoms and optionally conjugated or non-conjugated diolefins, the catalysts employed being metallocene compounds or π complex compounds of the formula ##STR1## in which CpI and CpII represent carbanions having a cyclopenadienyl-containing structure, n πI and πII represent charged or electrically neutral π systems, n D represents a donor atom and n A represents an acceptor atom, n 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, n 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 the actinides, n X denotes one anion equivalent and n n denotes the number zero, one, two, three or four, depending on the charge of M. |