Ethylene → Ethene propene 1-butene

Participants

Reaction Steps

In a 2000-mL polymerization reactor fully purged with nitrogen, 833 mL of dry hexane, 100 g of 1-butene, and 1.0 mmol of triisobutylaluminum were charged at normal temperature, the temperature in the reactor is elevated to 40° C., and propylene was supplied so that the pressure in the reactor increased to 0.76 MPa, and then ethylene was supplied to adjust the pressure at 0.8 MPa. To the reactor was added a toluene solution in which 0.001 mmol of dimethylmethylene(3-tert-butyl-5-methylcyclopentadienyl)fluorenylzirconium dichloride and 0.3 mmol (relative to aluminum) of methylaluminoxane (available from Tosoh Finechem Corporation) had been contacted, and the polymerization was conducted for 20 min while the inside temperature was kept at 40° C. and the inside pressure was kept at 0.8 MPa by supplying ethylene. Then, 20 mL of methanol was added to terminate polymerization. After the pressure was released, the polymer was precipitated from the polymerization solution in 2 L of methanol and dried at 130° C. under vacuum for 12 hr to yield 36.4 g of PEBR. For this polymer, intrinsic viscosity [q] was 1.81 dl/g, glass transition temperature Tg was −29° C., ethylene content was 17 mol %, butene content was 7 mol %, molecular weight distribution (Mw/Mn) was 2.1, and mm-fraction was 90%. No distinctive melting peak was observed (ΔH was less than 0.5 J/g) with a DSC. The basic properties of the present PEBR are shown in Table 1-1.

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