METHOD FOR THE PREPARATION OF ULTRA-HIGH MOLECULAR WEIGHT POLYETHYLENE

摘要

The invention relates to a method for the preparation of polyethylene having a molecular weight of at least 1 million g/mol, comprising the following steps: -introducing the following compounds into a gas phase reactor: an olefin polymerisation catalyst; at least one unreactive compound having a molecular weight of less than 150 g/mol; said unreactive compound being unreactive vis-à-vis ethylene, hydrogen, alpha-olefins and the olefin polymerisation catalyst; -introducing ethylene in the reactor; -polymerising ethylene in the presence of said unreactive compound; -obtaining polyethylene having a molecular weight of at least 1 milliong/mol.