Ethylene/alpha-olefin copolymer having excellent processibility

An ethylene/alpha-olefin copolymer having:

• a weight average molecular weight of 180,000 to 250,000 g/mol,
• a molecular weight distribution (Mw/Mn) of 5 to 20,
• a density of 0.950 to 0.965 g/cm3,
• a melt flow rate ratio MFR5/MFR2.16, measured at 190° C. according to ASTM 1238 of 5 to 10, and
• a spiral flow length of 15 to 25 cm, wherein the spiral flow length is evaluated by using a mold having a thickness of 1.5 mm, an injection temperature of 190° C., a mold temperature of 50° C., and an injection pressure of 90 bar,
• wherein the ethylene/alpha-olefin copolymer is prepared by polymerizing ethylene and alpha-olefin in the presence of a supported single metallocene catalyst including a metallocene compound of the following Chemical Formula 1;
• an aluminum-containing first cocatalyst;
• a borate-based second cocatalyst;
• and a support:
• (Cp1R1)n(Cp2R2)MX3-n [Chemical Formula 1]
• in Chemical Formula 1,
• M is a Group 4 transition metal;
• Cp1 and Cp2 are same as or different from each other, and are each independently any one selected from the group consisting of cyclopentadienyl, indenyl, 4,5,6,7-tetrahydro-1-indenyl, and fluorenyl radical, provided that both Cp1 and Cp2 are not cyclopentadienyl, and they are optionally substituted with a C1 to C20 hydrocarbon;
• R1 and R2 are same as or different from each other, and are each independently hydrogen, a C1 to C20 alkyl, a C1 to C10 alkoxy, a C2 to C20 alkoxyalkyl, a C6 to C20 aryl, a C6 to C10 aryloxy, a C2 to C20 alkenyl, a C7 to C40 alkylaryl, a C7 to C40 arylalkyl, a C8 to C40 arylalkenyl, or a C2 to C10 alkynyl;
• X is a halogen atom, a C1 to C20 alkyl, a C2 to C10 alkenyl, a C7 to C40 alkylaryl, a C7 to C40 arylalkyl, a C6 to C20 aryl, a substituted or unsubstituted C1 to C20 alkylidene, a substituted or unsubstituted amino, a C2 to C20 alkylalkoxy, or a C7 to C40 arylalkoxy;
• and
• n is 1 or 0.