Olefin block copolymer and preparation method thereof

A method for preparing an olefin block copolymer, comprising:

• copolymerizing monomers comprising ethylene or propylene and α-olefin under conditions including a temperature of 140° C. or higher and a pressure of 50 bar of higher,
• in the presence of a catalyst composition for olefin polymerization comprising a transition metal compound having a ligand compound of Chemical Formula 1 coordinated with a Group IV transition metal, and a compound represented by the following Chemical Formula 2:
• wherein m is an integer from 1 to 7;
• R1 is a C4-C10 cycloalkyl group having at least one substituent selected from the group consisting of hydrogen, deuterium, halogen, nitrile, acetylene, amine, amide, ester, ketone, C1-C20 alkyl, C6-C20 cycloalkyl, C2-C20 alkenyl, C6-C20 aryl, silyl, C7-C20 alkylaryl, C7-C20 arylalkyl, and C4-C20 heterocyclic;
• a C3-C9 heterocyclic group having at least one substituent selected from the group consisting of hydrogen, deuterium, halogen, nitrile, acetylene, amine, amide, ester, ketone, C1-C20 alkyl, C6-C20 cycloalkyl, C2-C20 alkenyl, C6-C20 aryl, silyl, C7-C20 alkylaryl, C7-C20 arylalkyl, and C4-C20 heterocyclic, and containing oxygen (O), nitrogen (N), or sulfur (S) as a hetero-atom;
• a C6-C10 aryl group having at least one substituent selected from the group consisting of hydrogen, deuterium, halogen, nitrile, acetylene, amine, amide, ester, ketone, C1-C20 alkyl, C6-C20 cycloalkyl, C2-C20 alkenyl, C6-C20 aryl, silyl, C7-C20 alkylaryl, C7-C20 arylalkyl, and C4-C20 heterocyclic;
• or a C5-C10 hetero-aryl group having at least one substituent selected from the group consisting of hydrogen, deuterium, halogen, nitrile, acetylene, amine, amide, ester, ketone, C1-C20 alkyl, C6-C20 cycloalkyl, C2-C20 alkenyl, C6-C20 aryl, silyl, C7-C20 alkylaryl, C7-C20 arylalkyl, and C4-C20 heterocyclic, and containing oxygen (O), nitrogen (N), or sulfur (S) as a hetero-atom, wherein when R1 has at least two substituents, the adjacent two groups forms an aliphatic or aromatic condensed ring;
• and
• R2s are the same or different from one another and independently selected from hydrogen, deuterium, halogen, nitrile, acetylene, amine, amide, ester, ketone, C1-C20 alkyl, C2-C20 alkenyl, C6-C20 aryl, C4-C20 heterocyclic, C1-C20 alkoxy, or C6-C20 aryloxy, wherein at least two R2 are linked to each other to form an aliphatic or aromatic ring,
• wherein, R1′ is R2′ are independently hydrogen, C1-C20 alkyl, C6-C20 aryl, silyl, C2-C20 alkenyl, C7-C20 alkylaryl, C7-C20 arylalkyl, or Group 14 metalloid radical having a hydrocarbyl substituent, wherein R1′ and R2′ are optionally linked to each other via an alkylidyne radical containing a C1-C20 alkyl group or an aryl group to form a ring;
• R3′ s are independently hydrogen, halogen, C1-C20 alkyl, C6-C20 aryl, C1-C20 alkoxy, C6-C20 aryloxy, or amido, wherein at least two R3′ s are optionally linked to each other to form an aliphatic or aromatic ring;
• CY1 is a substituted or unsubstituted aliphatic or aromatic ring;
• M is a Group IV transition metal;
• and
• Q1 and Q2 are independently halogen, C1-C20 alkyl, C6-C20 arylamido, C2-C20 alkenyl, C6-C20 aryl, C7-C20 alkylaryl, C7-C20 arylalkyl, or C1-C20 alkylidene.