| 摘要 |
PURPOSE:To obtain the titled polymer having improved rigidity and processing properties free from fish eye, by using a catalyst consisting of a reaction product of an oxygen-containing organomagnesium compound and a Ti halide compound, etc. and an organoaluminum compound, polymerizing ethylene under specific condition by two stages. CONSTITUTION:In polymerizing ethylene alone by the use of a catalyst consisting of (A) a reaction product of an oxygen-containing organomagnesium compound and a Ti halide compound, and (B) an organoaluminum compound in a hydrocarbon solvent at 50-100 deg.C, the polymerization reaction is carried out in the first and the second polymerization zones by two stages, ethylene is polymerized in the presence of hydrogen in a molar ratio of hydrogen to ethylene in a gaseous phase of 0.01-1.0 in one of the zones to prepare 30-70wt% based on the total amount of polymer prepared of a polymer having 100,000-700,000 viscosity-average molecular weight, ethylene is polymerized in the presence of hydrogen in a molar ratio of hydrogen to ethylene of 0.1-15 in the other zone to give 70-30wt% polymer having 10,000-40,000 viscosity-average molecular weight, so that the desired polymer having 0.1-1g/10min melt index and 0.965- 9.974g/cc density of the whole polymer is obtained.
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