SINGLE CATALYST LOW, MEDIUM AND HIGH DENSITY POLYETHYLENES

摘要

A METHOD OF POLYMERIZING OLEFINS COMPRISING COMBINING IN ONE EMBODIMENT ETHYLENE AND OPTIONALLY ONE OR MORE a-OLEFINS WITH A CATALYST COMPOSITION IN A CONTINUOUS POLYMERIZATION REACTOR AT A PRESSURE OF LESS THAN 10,000. KPA; WHEREIN THE CATALYST COMPOSITION COMPRISES A HAFNOCENE; AND ISOLATING A POLYETHYLENE HAVING A DENSITY IN THE RANGE OF FROM 0.930 TO 0.975 G/CM3. ALSO PROVIDED IS A METHOD OF TRANSITIONING A CONTINUOUS POLYMERIZATION REACTOR FROM PRODUCTION OF A LOW DENSITY POLYETHYLENE TO A MEDIUM OR HIGH DENSITY POLYETHYLENE. ALSO PROVIDED IS A MEDIUM TO HIGH DENSITY POLYETHYLENE SUITABLE FOR INJECTION OR ROTOMOLDING APPLICATIONS. ALSO PROVIDED IS A SINGLE CATALYST COMPOSITION SUITABLE FOR SUCH NEEDS.