| abstract |
Chemically homogeneous cycloolefin copolymers of polycyclic olefins, such as, for example, norbornene or tetracyclododecene, with cycloolefins and/or acyclic olefins are obtained without ring opening and in a high space-time yield if a catalyst system is used which comprises an aluminoxane and a stereorigid metallocene compound of an element from groups IVb to VIb, of the formula <IMAGE> the part of the metallocene molecule formed by M1 and the substituents R16-R17 having C1-symmetry or being in the meso-form. |