[CH:1]([CH:3]1[CH2:8][CH:7]2[CH2:9][CH:4]1[CH:5]=[CH:6]2)=[CH2:2].[CH2:10]([Al](CC(C)C)CC(C)C)[CH:11](C)[CH3:12].[H][H].C=CC.C=C>CCCCCC>[CH2:1]=[CH2:2].[CH2:10]=[CH:11][CH3:12].[CH:1]([CH:3]1[CH2:8][CH:7]2[CH2:9][CH:4]1[CH:5]=[CH:6]2)=[CH2:2]
A 2,000-ml polymerization device fully purged with nitrogen gas was charged with 1,000 ml of dry hexane, 2 ml of 5-vinyl-2-norbornene (VNB), and 0.3 mmol of triisobutylaluminum. After raising the internal temperature of the polymerization device to 80° C., hydrogen (5 NmL) was introduced. Propylene was supplied into the polymerization device so that the system pressure was raised to 0.25 MPa. Subsequently, ethylene was supplied into the polymerization device so that the system pressure was 0.8 MPa. A hexane solution containing 0.001 mmol of (t-butylamide)dimethyl(tetramethyl-η5-cyclopentadienyl)silane titaniumdichloride and 0.005 mml of triphenylcarbenium(tetrakispentafluorophenyl)borate was added in the polymerization device. With maintaining the internal temperature of the polymerization device at 80° C. and system pressure at 0.8 MPa, polymerization was allowed to take place for 10 minutes. Polymerization reactions were quenched by the addition of 2 ml methanol. After the pressure was released, a polymer was precipitated from the polymerization solution in 2 L of methanol, and the precipitated polymer was dried in vacuo at 130° C. for 12 hours to afford 50 g of ethylene/propylene/5-vinyl-2-norbornene copolymer. Physical properties of the copolymer are set forth in Table 1.
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