Olefin-based polymer, film prepared therefrom, and preparation methods therefor

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

• polymerizing an olefin-based monomer in the presence of a hybrid catalyst supported on a carrier including:
• at least one first transition metal compound represented by the following Chemical Formula 1;
• and at least one second transition metal compound selected from the group consisting of a compound represented by the following Chemical Formula 2 and a compound represented by the following Chemical Formula 3,
• wherein the first transition metal compound is at least one selected from the group consisting of transition metal compounds represented by the following Chemical Formulae 1-1 and 1-2;
• and the second transition metal compound is at least one selected from the group consisting of transition metal compounds represented by the following Chemical Formulae 2-1, 2-2, and 3-1,
• wherein the carrier includes at least one selected from the group consisting of silica, alumina, and magnesia,
• thereby obtaining an olefin-based polymer, wherein the olefin-based polymer has (1) a density of 0.910 to 0.940 g/cm3;
• (2) a melt index (I2.16) of 0.5 to 2.0 g/10 min as measured with a load of 2.16 kg at 190° C.;
• (3) a ratio between a melt index (I21.6) measured with a load of 21.6 kg and a melt index (I2.16) measured with a load of 2.16 kg at 190° C. of 20 to 60;
• and (4) a comonomer distribution slope (CDS) defined by Equation 1 of 3 or more:
• CDS=(C80—C20)/(logM80-logM20)
• wherein M1 and M2 are different from each other and 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, and
• R1 to R10 are independently of one another hydrogen, 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, substituted or unsubstituted C1-20 alkylidene, or substituted or unsubstituted C1-20 silyl, but R1 to R10 may be independently of each other connected to an adjacent group to form a substituted or unsubstituted saturated or unsaturated C4-20 ring,
• wherein Me is a methyl group.

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

• (a) polymerizing an olefin-based monomer in the presence of a hybrid catalyst including:
• at least one first transition metal compound represented by the following Chemical Formula 1;
• and at least one second transition metal compound selected from the group consisting of a compound represented by the following Chemical Formula 2 and a compound represented by the following Chemical Formula 3, thereby obtaining an olefin-based polymer;
• and (b) molding the olefin-based polymer to obtain a film, wherein the olefin-based polymer film has a heat seal strength of 30 gf/2.5 cm or more as measured under the conditions of 0.2 bar, 1.5 seconds, and 130° C., a heat seal strength of 150 gf/2.5 cm or more as measured under the conditions of 0.2 bar, 1.5 seconds, and 135° C., a hot tack strength at 100° C. of 0.45 N/2 cm or more, and a hot tack strength at 110° C. of 3.45 N/2 cm or more:
• wherein M1 and M2 are different from each other and 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, and
• R1 to R10 are independently of one another hydrogen, 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, substituted or unsubstituted C1-20 alkylidene, or substituted or unsubstituted C1-20 silyl, but R1 to R10 may be independently of each other connected to an adjacent group to form a substituted or unsubstituted saturated or unsaturated C4-20 ring,
• wherein C20 and C80 are comonomer contents at points where cumulative weight fractions are 20% and 80%, respectively, in a comonomer distribution, and M20 and M80 are molecular weights at points where cumulative weight fractions are 20% and 80%, respectively, in a comonomer distribution.