POLYOLEFINS WITH HIGH GLASS-TRANSITION TEMPERATURES

The copolymerization of propene and norbornene with the isospecific me tallocene catalyst dimethylsilylenebis(eta(5)-inden-1-yl)zirconium dic hloride/methylaluminoxane ((CH3)(2)Si[Ind](2)ZrCl2/MAO) was investigat ed. Because of the surprisingly high reactivity of the cyclic olefin c opolymers with a norbornene content of 11 mol-% up to 98 mol-% were sy nthesized. The resulting copolymers are amorphous. The glass transitio n temperatures studied by differential scanning calorimetry measuremen ts increase with rising norbornene content in the copolymer. High glas s transition temperatures of T-g > 240 degrees C were found for the co polymers with the highest content of norbornene.