| abstract |
The present invention provides a bimodal molecular weight distribution, a molecular weight distribution MWD of at least 7.0, a HLMI of 1 to 100 g / 10 min, and a polyethylene resin having a density of 0.935 to 0.960 g / cm 3 in two or more slurry loop reactors connected in series. As a polymerization method of ethylene for In the presence of a Ziegler-Natta catalyst system, In one reactor, 0.05 to 1.8 g / 10 min of HL275 (equivalent to HLMI is 0.01 to 0.56 g / 10 min) as a high molecular weight (HMW) polyethylene fraction of 30 to 47 wt% relative to the total weight of polyethylene resin, A fraction having a density of 0.925 to 0.942 g / cm 3 and a MWD of at least 5.0 is prepared, In another reactor, a low molecular weight (LMW) polyethylene fraction is prepared in which a fraction having a HLMI of 10 to 1500 g / 10 min and a density of 0.960 to 0.975 g / cm 3 is produced. |