Cycloolefin polymers

The prodn. of cycloolefin polymers (COC) comprises the polymerisation of (a) 0.1-100 wt.% monomer(s) of formula (I), (II), (III) or (IV), (b) 0-99.9 wt.% cycloolefin of formula (V) and (c) acyclic 1-olefin(s) of formula (VI), at -78 to +150 degrees C and 0.5-64 bar in soln., suspension, monomer melt or gas phase, in the presence of a catalyst consisting of a metallocene component of formula (IX) and linear and/or cyclic aluminoxane(s) of formula (VII) and/or (VIII). R -R = H or 1-8 C alkyl; n = 2-10; R = 1-6 C alkyl, Ph or benzyl; m = 2-50; M = Ti, Zr, Hf, V, Nb or Ta; R , R = H, halo, 1-10 C alkyl or alkoxy, 2-10 C alkenyl, 6-10 C aryl or aryloxy, 7-40 C aralkyl or alkaryl, or 8-40 C aralkenyl; R , R = mono- or poly-nuclear hydrocarbon residue which can form a sandwich structure with M ; R = -X-, -X-M R R -, -X-C(R )2-, -CR R -, -O-X-, -CR R -CR R - or -BR -; X = -M R R -; M = Si, Ge or Sn; R -R = H, halo, 1-10 C alkyl, fluoroalkyl or alkoxy, 6-10 C aryl or fluoroalkyl, 2-10 C alkenyl, 7-40 C aralkyl or alkaryl, or 8-40 C aralkenyl; or R +R or R +R or R +R may form a ring with their linking atom. Also claimed are COC polymers obtd. by this process, esp. with a content of more than 40 mole% norbornene units. Also claimed are extruded parts, injection moulded prods. and polymer alloys contg. the above COC polymer(s).