Ethylene Polymerization Over Ph2 C ( C p)(2,7‐t‐ B u2 F lu) Z r C l2 Supported On SiO2‐MAO

Ethylene polymerization over heterogeneous [Ph2C(Cp)(2,7‐t‐Bu2Flu)ZrCl2] supported on SiO2‐MAO is studied. The influence of the main reaction variables is determined in ethylene homopolymerization: TEA concentration (88–702 ppm), temperature (55–85 °C) and pressure (3–12 bar). An optimum in the catalytic activity is achieved at TEA a concentration of 351 ppm, 85 °C and 8 bar of ethylene. At this ethylene pressure, all the polyethylenes show molecular weights above 400 000 g · mol−1. Using hydrogen as transfer agent, the activity is distinctly lower but it is possible to attain molecular weights below 40 000 g · mol−1. Regarding 1‐butene, it is observed good catalytic response in copolymerization, observing remarkable activities, higher than those obtained in homopolymerization.