The copolymerization of propene and norbornene with the isospecific metallocene catalyst dimethylsilylenebis(eta(5)-inden-1-yl)zirconium dichloride/methylaluminoxane ((CH3)(2)Si[Ind](2)ZrCl2/MAO) was investigated. Because of the surprisingly high reactivity of the cyclic olefin copolymers with a norbornene content of 11 mol-% up to 98 mol-% were synthesized. The resulting copolymers are amorphous. The glass transition temperatures studied by differential scanning calorimetry measurements increase with rising norbornene content in the copolymer. High glass transition temperatures of T-g > 240 degrees C were found for the copolymers with the highest content of norbornene.