Ethylene → Ethene propene 1-butene

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A polymerization reactor of 4000 ml which was sufficiently purged with nitrogen was charged with 1834 ml of dried hexane, 110 g of 1-butene and triisobutylaluminum (1.0 mmol) at ambient temperature. Then, an inside of the polymerization reactor was heated to 55° C., and pressure was applied by propylene so that the inside pressure of the system was 0.58 MPa. Thereafter, the inside pressure of the system was controlled to 0.75 MPa by ethylene. Next, diphenylmethylene(3-tert-butyl-5-ethylcyclopentadienyl)(2,7-di-tert-butylfluorenyl)zirconium dichloride synthesized in Catalyst Synthetic Example 4 was mixed with a toluene solution of methylaluminoxane (manufactured by Tosoh Finechem Corporation) to prepare a toluene solution containing an aluminum atom and a zirconium atom in a proportion of aluminum atom/zirconium atom=300/1 (mole ratio), and then the above toluene solution was taken in an amount containing 0.001 mmol of a zirconium atom (accordingly, an amount containing 0.3 mmol of an aluminum atom) and added to the polymerization reactor. They were polymerized at an inside temperature of 55° C. for 25 minutes while maintaining the inside pressure of the system at 0.75 MPa by ethylene, and 20 ml of methanol was added to terminate the polymerization. After releasing the pressure, the polymer was deposited from the polymerization solution in 4 L of methanol, and the polymer was dried at 130° C. for 12 hours under vacuum. The polymer thus obtained had a weight of 120.2 g and MFR of 0.7 (g/10 minutes). The physical properties obtained by measuring the polymer obtained above are shown in Table 6.

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