Bimodal polyethylene copolymer and film thereof

A bimodal ethylene-co-1-butene copolymer consisting essentially of a higher molecular weight (HMW) component and a lower molecular weight (LMW) component and, when in melted form at 190° C., exhibits a melt property space defined by a combination of high-load melt index (“HLMI” or “I21”), melt flow ratio I21/I5 (“MFR5”), and melt elasticity (G′/G″@0.1 rad/s) properties, wherein the HLMI is 8.0 to 12.0 grams per 10 minutes (g/10 min);

• the MFR5 is 25.0 to 37.0, wherein the I21 and I5 values used to calculate the MFR5 are each in g/10 min and are measured according to ASTM D1238-13 (190° C., 21.6 kg, “I21”;
• and 190° C., 5.0 kg, “I5”, respectively), and the melt elasticity is 0.55 to 0.68, and wherein melt elasticity=G′/G″ determined at 0.1 radian per second (rad/s) according to Melt Elasticity Test Method;
• and wherein the HMW component has a weight-average molecular weight (Mw-HMW) greater than 425,000 g/mol;
• wherein the bimodal ethylene-co-1-butene copolymer has a component molecular weight spread characterized by a ratio of the weight-average molecular weight of the HMW component (Mw-HMW) to the weight-average molecular weight of the LMW component (Mw-LMW) from 35.0 to 45.0, measured according to the GPC Test Method.