Olefin-based polymer preparation method and olefin-based polymer, which is prepared thereby and has excellent processability

A method for preparing an olefin-based polymer, the method comprising:

• polymerizing ethylene and at least one α-olefin in the presence of a hybrid metallocene catalyst comprising:
• (a) at least one first transition metal compound selected from transition metal compounds represented by the following Chemical Formulae 1 to 4;
• (b) at least one second transition metal compound selected from a transition metal compound represented by the following Chemical Formula 5;
• and (c) a cocatalyst compound to obtain an olefin-based polymer, wherein the olefin-based polymer has a density of 0.930 to 0.970 g/cm3, a melt index (I2.16) of 0.1 to 2.0 g/10 min as measured at 190° C. with a load of 2.16 kg, a weight average molecular weight of 100,000 to 150,000 g/mol, and a shear rate defined by the following Equation 1 of 1,500 sec−1 or more, at which a melt fracture or shark skin phenomenon occurs when measured with a capillary rheometer:
• γ
• .
• ap
• =
• 4
• ⁢
• V
• π
• ⁢
• R
• 3
• [
• Equation
• ⁢
• 1
• ]
• wherein {dot over (r)}ap is an apparent shear rate (sec−1), V is a volume flow (mm3/sec) produced by a piston, and R is a radius (mm) of a round hole capillary,
• l1 and m1 are independently of each other an integer of 0 to 5,
• l2, l3, l4, and m2 are independently of one another an integer of 0 to 4,
• m3 and m4 are independently of each other an integer of 0 to 2,
• p is an oxidation state of M, and is +3, +4, or +5,
• q is a formal charge of a YZL ligand, and is 0, −1, −2, or −3,
• M is independently of each other titanium (Ti), zirconium (Zr), or hafnium (Hf),
• X is independently of each other halogen, C1-20 alkyl, C2-20 alkenyl, C2-20 alkynyl, C6-20 aryl, C1-20 alkyl C6-20 aryl, C6-20 aryl C1-20 alkyl, C1-20 alkylamido, or C6-20 arylamido,
• Q is independently of each other carbon (C), silicon (Si), germanium (Ge), or tin (Sn),
• Q′ is an anionic leaving group and is independently of each other hydrogen, a substituted or unsubstituted C1-40 hydrocarbon group, a substituted or unsubstituted C1-40 heterohydrocarbon group, a hetero atom, or halogen,
• Q″ is a substituted or unsubstituted C2-4 alkylene group,
• L is nitrogen,
• Y is nitrogen or phosphorus,
• Z is nitrogen or phosphorus,
• R1 to R4, R7, R8, R18, and R19 are independently of one another substituted or unsubstituted C1-20 alkyl, substituted or unsubstituted C2-20 alkenyl, substituted or unsubstituted C6-20 aryl, substituted or unsubstituted C1-20 alkyl C6-20 aryl, substituted or unsubstituted C6-20 aryl C1-20 alkyl, substituted or unsubstituted C1-20 heteroalkyl, substituted or unsubstituted C3-20 heteroaryl, substituted or unsubstituted C1-20 alkylamido, substituted or unsubstituted C6-20 arylamido, or substituted or unsubstituted C1-20 silyl, but these may or may not be independently of each other connected to an adjacent group to form a substituted or unsubstituted, saturated or unsaturated C4-20 ring,
• R5, R6, R9, and R10 are independently of one another substituted or unsubstituted C1-20 alkyl, substituted or unsubstituted C2-20 alkenyl, substituted or unsubstituted C6-20 aryl, substituted or unsubstituted C1-20 alkyl C6-20 aryl, substituted or unsubstituted C6-20 aryl C1-20 alkyl, substituted or unsubstituted C1-20 heteroalkyl, substituted or unsubstituted C3-20 heteroaryl, substituted or unsubstituted C1-20 alkylamido, substituted or unsubstituted C6-20 arylamido, or substituted or unsubstituted C1-20 silyl, but R5 and R6 and R9 and R10 may or may not be independently of each other connected to each other to form a substituted or unsubstituted, saturated or unsaturated C2-20 ring,
• R11 and R12 are independently of each other a C1-20 hydrocarbon group or a heteroatom-containing group, in which the heteroatom is silicon, germanium, tin, lead, or phosphorus, or Ru and R12 may be connected to each other,
• R13 does not exist, or is hydrogen, C1-20 alkyl, a halogen, or a heteroatom-containing group,
• R14 and R15 are independently of each other an alkyl group, an aryl group, a substituted aryl group, a cyclic alkyl group, a substituted cyclic alkyl group, or a polycyclic system, and
• R16 and R17 independently of each other, do not exist or may be hydrogen, an alkyl group, a halogen, heteroatom, a hydrocarbyl group, or a heteroatom-containing group.