| 摘要 |
PURPOSE:To provide the titled copolymer composed of ethylene and a specific alpha-olefin, having specific intrinsic viscosity, density and flow rate ratio, excellent mechanical strength and inflation moldability, and suitable as a material of packaging film, etc. CONSTITUTION:The objective copolymer having an intrinsic viscosity of 3.10- 3.80dl/g, a density of 0.950-0.965g/cm<3> and a flow rate ratio of 110-240, preferably 160-220 is obtained by copolymerizing ethylene (preferably 97.0-99.8wt%) with a 5-7C straight-chain alpha-olefin (preferably hexene-1) (preferably 3.0- 0.2wt%) preferably by two-stage polymerization (polymerizing ethylene, and then copolymerizing ethylene and the 5-7C straight-chain alpha-olefin to the resultant polyethylene).
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