PROCESS FOR THE PREPARATION OF ETHYLENE POLYMER AND ETHYLENE POLYMER

摘要

A process for the preparation of an ethylene polymer comprising conducting homopolymerization of ethylene or copolymerization of ethylene with a C3-C20 alpha -olefin at 80 DEG C or above in the presence of a catalyst comprising (A) a specific Group IVB transition metal compound, (B) (B-1) an organoaluminumoxy compound and/or (B-2) a compound which reacts with the transition metal compound (A) to form an ion pair and, if necessary, (C) an organoaluminum compound. This process can give an ethylene (co)polymer having an enhanced molecular weight even under the condition of high polymerization temperature. According to this process, the polymerization can be conducted at a temperature higher than that of the prior art and therefore the cooling apparatus can be miniaturized to reduce the plant cost.