Ethylene/1-Hexene Copolymer Having Excellent Long-Term Physical Properties and Processability

An ethylene/1-hexene copolymer satisfying the following (a1) to (a5) conditions:

• (a1) a shear viscosity, as measured at 210° C. and a shear rate of 1/1000 sec using a capillary rheometer:
• 300 Pa·s to 400 Pa·s,
• (a2) a melt flow rate ratio of MFR21.6/MFR2.16, as measured at 190° C. according to ASTM D1238:
• 90 or more and less than 120,
• (a3) a Broad Orthogonal Co-monomer Distribution (BOCD) index according to the following Equation 1:
• 3.5 to 5,
• (a4) a molecular weight distribution:
• 12 to 15, and
• (a5) a bimodal molecular weight distribution.
• BOCD Index=(SCB content at high molecular weight region SCB content at low molecular weight region)/(SCB content at low molecular weight region) [Equation 1]
• in Equation 1, the SCB content at a high molecular weight region and the SCB content at a low molecular weight region represent short chain branch contents at the left and right borders of centered 60% area excluding 20% of the left and right ends in the total area, respectively, when a molecular weight distribution curve is obtained by plotting a log value of a weight average molecular weight on the x-axis, and a molecular weight distribution with respect to the log value on the y-axis.