| 摘要 |
PCT No. PCT/EP97/03460 Sec. 371 Date Dec. 30, 1998 Sec. 102(e) Date Dec. 30, 1998 PCT Filed Jul. 2, 1997 PCT Pub. No. WO98/01484 PCT Pub. Date Jan. 15, 1998Cycloolefin 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, alpha -olefins having 2 or more C atoms and optionally conjugated or non-conjugated diolefins, the catalysts employed being metallocene compounds or pi complex compounds of the formula in which CpI and CpII represent carbanions having a cyclopenadienyl-containing structure, pi I and pi II represent charged or electrically neutral pi systems, D represents a donor atom and A 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 the actinides, X denotes one anion equivalent and n denotes the number zero, one, two, three or four, depending on the charge of M.
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