| 摘要 |
PURPOSE:To provide the titled composition having specific physical properties, containing butene and propylene at specific ratios, having excellent mechanical strength, processability, productivity and moldability, etc., and suitable for a thin-walled reinforced film of high-density polyethylene, etc. CONSTITUTION:The objective composition having a density of 0.935-0.96g/cm<3>, an intrinsic viscosity of 1.5-5.5dl/g, ethylene content of 9.25-99.7wt%, propylene content of 3.5-0.1wt%, butene-1 content of 4-0.2wt% and the number ratio of branched methyl to branched ethyl of 0.06-10 is prepared by (1) preferably polymerizing ethylene in the presence of a Ziegler catalyst, and (2) copolymerizing the resultant polyethylene with ethylene, propylene and butene-1. EFFECT:It gives a film having excellent appearance by inflation molding process.
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