Olefin-based polymers and methods of making same

Abstract

The present invention relates to an olefin-based polymer and, more specifically, to an olefin-based polymer which enables excellent processability and mechanical strength to be exhibited at the same time, and a method for preparing the same.

Description

Technical Field

[0001] The present invention relates to an olefin-based polymer, and more particularly, to an olefin-based polymer that can simultaneously exhibit the effects of excellent processability, low density, and excellent mechanical strength, and a method for preparing the same. Background Art

[0002] A metallocene catalyst, which is one of catalysts for polymerizing olefins, is a compound in which a ligand such as a cyclopentadienyl group, an indenyl group, and a cycloheptadienyl group is coordinated with a transition metal or a transition metal halogen compound, and has a basic sandwich structure.

[0003] Metallocene catalysts are known as single-site catalysts because they are single compounds with a fixed structure, resulting in all active sites having the same polymerization characteristics. However, Ziegler-Natta catalysts, another catalyst used for olefin polymerization, have metal components as active sites dispersed on an inert solid surface, resulting in heterogeneous properties at the active sites. Compared to Ziegler-Natta catalysts, polymers polymerized using these metallocene catalysts have narrow molecular weight distributions, uniform comonomer distributions, and higher copolymerization activities.

[0004] Linear low-density polyethylene (LLDPE) is produced by copolymerizing ethylene and α-olefins using a polymerization catalyst under low pressure. It has a narrow molecular weight distribution, short-chain branches (SCBs) of constant length, and generally no long-chain branches (LCBs). Films made from LLDPE possess the characteristics of general polyethylene, including high breaking strength and elongation, as well as excellent tear and impact strength. Consequently, they are widely used in stretch films and overlap films, where conventional low-density polyethylene or high-density polyethylene is difficult to apply.

[0005] Meanwhile, attempts have been made in the past to polymerize olefin-based polymers using a single metallocene catalyst, but conventionally polymerized olefin-based polymers have problems with poor processability and mechanical strength.

[0006] Therefore, there is an urgent need to develop olefin-based polymers having low density while ensuring excellent processability and mechanical strength. Summary of the Invention Technical issues

[0007] The present invention has been devised to overcome the above problems, and an object of the present invention is to provide an olefin-based polymer and a preparation method thereof, which can simultaneously exhibit the effects of excellent processability, low density, and excellent mechanical strength. Technical Solution

[0008] In order to solve the above problems, the present invention provides a method for preparing an olefin-based polymer, which comprises preparing an olefin-based polymer by polymerizing an olefin-based monomer under a catalyst at a predetermined ethylene partial pressure, wherein the method satisfies the following condition (1):

[0009]

[0010] Wherein in the above condition (1), Pc2 is the ethylene partial pressure (bar), and MFR represents the olefin-based polymer .

[0011] According to one embodiment of the present invention, the olefin-based polymer may have a melt flow index measured at 190° C. under a load of 2.16 kg according to ASTM D1238 of 0.5 g / 10 min to 1.5 g / 10 min, and a melt flow index measured at 190° C. under a load of 21.6 kg of 20 g / 10 min to 30 g / 10 min.

[0012] Furthermore, the ethylene partial pressure may be from 9.5 bar to 16.5 bar.

[0013] In addition, the catalyst may include a mixed catalyst including different first and second compounds represented by the following Chemical Formula 1:

[0014] [Chemical Formula 1]

[0015]

[0016] Wherein in the above chemical formula 1,

[0017] M1 can be titanium (Ti), zirconium (Zr) or hafnium (Hf),

[0018] wherein X1 can be halogen, substituted or unsubstituted C1 to C5 alkyl, substituted or unsubstituted C2 to C5 alkenyl, substituted or unsubstituted C1 to C5 alkynyl, substituted or unsubstituted C1 to C5 alkoxy, substituted or unsubstituted C6 to C 20 Aryloxy, substituted or unsubstituted C6 to C 20 Aryl, or substituted or unsubstituted C2 to C 20 heteroaryl,

[0019] where R 1 and R 2 and C1 to C5 alkyl, C2 to C5 alkenyl, C1 to C5 alkynyl, C1 to C5 alkoxy, C6 to C7 alkyl, C2 to C7 alkylene, C1 to C5 substituted or unsubstituted alkylene groups.20 Aryloxy, substituted or unsubstituted C6 to C 20 Aryl, or substituted or unsubstituted C2 to C 20 Heteroaryl, and

[0020] wherein a and b may each independently be an integer from 1 to 5.

[0021] In addition, the catalyst may further include a co-catalyst compound, the co-catalyst compound including at least any one of a compound represented by the following Chemical Formula 2, a compound represented by the following Chemical Formula 3, and a compound represented by the following Chemical Formula 4:

[0022] [Chemical Formula 2]

[0023]

[0024] [Chemical Formula 3]

[0025]

[0026] [Chemical Formula 4]

[0027] [LH] + [Z(A)4] - or [L] + [Z(A)4] -

[0028] Wherein in the above chemical formula 2, R 3 It may be a halogen atom, or a C1 to C 20 a hydrocarbon group, and n may be an integer of 2 or greater,

[0029] In the above chemical formula 3, M2 can be aluminum (Al) or boron (B), and R 4 、R 5 and R 6 can be independently a halogen atom, a halogen-substituted or unsubstituted C1 to C 20 Hydrocarbon, or halogen-substituted or unsubstituted C1 to C 20 Alkoxy, and

[0030] Wherein in the above chemical formula 4, L can be a neutral or cationic Lewis base, [LH] + and [L] + may be a Bronsted acid, Z may be a Group 13 element, and A may be each independently a substituted or unsubstituted C6 to C 20 Aryl, or substituted or unsubstituted C1 to C 20 alkyl.

[0031] Furthermore, the catalyst may further include a carrier that supports at least any one of the mixed catalyst and the co-catalyst compound and includes at least any one of silica, alumina, and magnesia.

[0032] Furthermore, the present invention provides an olefin-based polymer satisfying the following condition (1):

[0033]

[0034] Wherein in the above condition (1), Pc2 is the ethylene partial pressure (bar), and MFR represents the olefin-based polymer .

[0035] According to one embodiment of the present invention, the olefin-based polymer may have a melt flow index measured at 190° C. under a load of 2.16 kg according to ASTM D1238 of 0.5 g / 10 min to 1.5 g / 10 min, and a melt flow index measured at 190° C. under a load of 21.6 kg of 20 g / 10 min to 30 g / 10 min.

[0036] In addition, olefin-based polymers can also meet the following conditions (2):

[0037]

[0038] Wherein in the above condition (2), Pc2 is the ethylene partial pressure (bar), and the drop impact strength represents the drop impact strength measured according to ASTM D1709.

[0039] Furthermore, the ethylene partial pressure may be from 9.5 bar to 16.5 bar.

[0040] In addition, the olefin-based polymer may have a 3 Up to 0.935 kg / m 3 density and drop impact strength of 520 g or greater. Beneficial effects

[0041] The olefin-based polymer and the preparation method thereof according to the present invention can simultaneously exhibit the effects of excellent processability, low density, and excellent mechanical strength. DETAILED DESCRIPTION

[0042] Hereinafter, embodiments of the present invention will be described in detail so that those skilled in the art can easily practice the present invention. The present invention can be implemented in various forms and is not limited to the embodiments described herein.

[0043] As described above, in the case of the conventional olefin-based polymer and the preparation method thereof, there are problems of poor processability and mechanical strength due to the use of a metallocene single catalyst.

[0044] Therefore, the present invention seeks to solve the above-mentioned problems by providing a method for preparing an olefin-based polymer, which comprises preparing an olefin-based polymer by polymerizing an olefin-based monomer in the presence of a catalyst at a predetermined ethylene partial pressure.

[0045] Thus, the present invention can simultaneously exhibit the effects of excellent workability, low density, and excellent mechanical strength.

[0046] Meanwhile, the method for preparing an olefin-based polymer according to the present invention satisfies the following condition (1).

[0047] As condition (1), , and preferably, .

[0048] In this case, in the above condition (1), Pc2 is the ethylene partial pressure (bar), and MFR represents the olefin-based polymer .

[0049] If in the above condition (1) Less than 23.49, the mechanical strength may be low, and if Above 24.762, the processability may be poor, and even if the processability is good, the mechanical strength may be reduced and / or the density may be increased.

[0050] Meanwhile, the step of preparing the olefin-based polymer by polymerizing the olefin-based monomer under a catalyst at a predetermined ethylene partial pressure may include preparing the catalyst and preparing the olefin-based polymer under a predetermined ethylene partial pressure.

[0051] First, the steps of preparing the catalyst will be described.

[0052] According to one embodiment of the present invention, the catalyst may include a mixed catalyst, and preferably, it may include a mixed catalyst including a first compound and a second compound different from each other and represented by the following Chemical Formula 1.

[0053] [Chemical Formula 1]

[0054]

[0055] In Chemical Formula 1,

[0056] M1 is titanium (Ti), zirconium (Zr) or hafnium (Hf),

[0057] X1 is halogen, substituted or unsubstituted C1 to C5 alkyl, substituted or unsubstituted C2 to C5 alkenyl, substituted or unsubstituted C1 to C5 alkynyl, substituted or unsubstituted C1 to C5 alkoxy, substituted or unsubstituted C6 to C 20 Aryloxy, substituted or unsubstituted C6 to C 20 Aryl, or substituted or unsubstituted C2 to C 20 heteroaryl,

[0058] R 1 and R 2 are each independently hydrogen, deuterium, substituted or unsubstituted C1 to C5 alkyl, substituted or unsubstituted C2 to C5 alkenyl, substituted or unsubstituted C1 to C5 alkynyl, substituted or unsubstituted C1 to C5 alkoxy, substituted or unsubstituted C6 to C 20 Aryloxy, substituted or unsubstituted C6 to C 20 Aryl, or substituted or unsubstituted C2 to C 20 Heteroaryl, and

[0059] a and b are each independently an integer of 1 to 5.

[0060] Preferably, in the above Chemical Formula 1,

[0061] M1 can be zirconium (Zr) or hafnium (Hf),

[0062] X1 may be halogen, substituted or unsubstituted C1 to C5 alkyl, substituted or unsubstituted C2 to C5 alkenyl, substituted or unsubstituted C1 to C5 alkynyl, or substituted or unsubstituted C1 to C5 alkoxy, and

[0063] R 1 and R 2 Each may independently be hydrogen, a substituted or unsubstituted C1 to C5 alkyl group, a substituted or unsubstituted C2 to C5 alkenyl group, a substituted or unsubstituted C1 to C5 alkynyl group, or a substituted or unsubstituted C1 to C5 alkoxy group.

[0064] Meanwhile, the first compound may preferably be a compound represented by the following Chemical Formula 1-1, and the second compound may preferably be a compound represented by the following Chemical Formula 1-2.

[0065] [Chemical Formula 1-1]

[0066]

[0067] [Chemical formula 1-2]

[0068]

[0069] By satisfying the above condition (1) and including a mixed catalyst, the object of the present invention can be advantageously achieved, and by satisfying the above condition (1) and including the first compound and the second compound, the object of the present invention can be further advantageously achieved, and by satisfying the above condition (1) and including the first compound represented by the above chemical formula 1-1 and the second compound represented by the above compound 1-2, the object of the present invention can be further advantageously achieved.

[0070] Meanwhile, when the catalyst is a mixed catalyst comprising a first compound and a second compound, the mixed catalyst may comprise the first compound and the second compound in a weight ratio of 1:0.1 to 0.8, and preferably, the first compound and the second compound in a weight ratio of 1:0.12 to 0.7. When the weight ratio of the first compound to the second compound satisfies the above range, it may be more advantageous to achieve the purpose of the present invention.

[0071] According to one embodiment of the present invention, the catalyst may further include a co-catalyst compound, and preferably, the co-catalyst compound may include at least any one of a compound represented by the following Chemical Formula 2, a compound represented by the following Chemical Formula 3, and a compound represented by the following Chemical Formula 4.

[0072] [Chemical Formula 2]

[0073]

[0074] [Chemical Formula 3]

[0075]

[0076] [Chemical Formula 4]

[0077] [LH] + [Z(A)4] - or [L] + [Z(A)4] -

[0078] In the above chemical formula 2, R 3 is a halogen atom, or a C1 to C 20 a hydrocarbon group, and n is an integer of 2 or greater,

[0079] In the above chemical formula 3, M2 is aluminum (Al) or boron (B), and R 4 、R 5 and R 6 are each independently a halogen atom, a halogen-substituted or unsubstituted C1 to C 20 Hydrocarbon, or halogen-substituted or unsubstituted C1 to C 20 Alkoxy, and

[0080] In the above chemical formula 4, L is a neutral or cationic Lewis base, [LH] + and [L] + is a Bronsted acid, Z is a Group 13 element, and A is each independently a substituted or unsubstituted C6 to C 20 Aryl, or substituted or unsubstituted C1 to C 20 alkyl.

[0081] Meanwhile, more preferably, the co-catalyst compound may include aluminoxane, and more preferably, the aluminoxane may be methylaluminoxane (MAO), and thus, it may be more advantageous to achieve the purpose of the present invention.

[0082] Furthermore, according to one embodiment of the present invention, the catalyst may further include a carrier that supports at least any one of the mixed catalyst and the co-catalyst compound, and preferably supports the mixed catalyst and the co-catalyst compound.

[0083] As for the carrier, any known carrier can be used without limitation, as long as it is a carrier that can load the above-mentioned mixed catalyst and co-catalyst compound, but preferably, it includes at least any one of silica, alumina and magnesium oxide, and more preferably silica, which can be more conducive to achieving the purpose of the present invention.

[0084] As described above, when the catalyst comprises the above-mentioned carrier, the above-mentioned mixed catalyst loaded on the carrier, and the above-mentioned co-catalyst compound, the steps of preparing the catalyst may include: forming a combined catalyst by mixing the mixed catalyst and the co-catalyst compound; loading the mixed catalyst and the co-catalyst compound on the carrier by mixing the combined catalyst, the carrier, and a solvent; and drying the carrier loaded with the mixed catalyst and the co-catalyst compound.

[0085] Combination catalyst can be formed by mixing a mixed catalyst and a promotor compound, and the promotor compound can be mixed in the promotor solution with a concentration of 5% to 15%. The mixing of mixed catalyst and promotor compound can be by mixing a mixed catalyst and a promotor solution with a weight ratio of 1:130 to 180, and preferably, mixed catalyst and promotor solution are mixed with a weight ratio of 1:140 to 170 to carry out. When meeting the weight ratio of mixed catalyst and promotor solution, it is possible to be more conducive to realizing purpose of the present invention. In this case, the solvent of the promotor solution can be identical or different with the solvent used in the following loading step, but is not limited thereto.

[0086] In addition, the loading step can mix the combined catalyst (comprising the solvent of the co-catalyst solution) and the carrier with a weight ratio of 1:0.1 to 0.35, and preferably, the combined catalyst and the carrier are mixed with a weight ratio of 1:0.12 to 0.32, and based on 100 parts by weight of the carrier, the solvent can be mixed in an amount of 150 parts by weight to 350 parts by weight, and preferably 200 parts by weight to 300 parts by weight. When meeting the weight ratio and solvent content range of the combined catalyst and the carrier, it is possible to be more conducive to achieving the purpose of the present invention. In this case, a solvent can be used without restriction, as long as it is a solvent that can be commonly used in this area, and preferably, it can include toluene, but is not limited thereto.

[0087] Meanwhile, the loading step may be performed at a temperature of 55 to 85° C. for 1 to 3 hours, and preferably, at a temperature of 60 to 80° C. for 1.5 to 2.5 hours, but is not limited thereto.

[0088] In addition, the step of drying the carrier loaded with the mixed catalyst and co-catalyst compound can be carried out at a temperature of 45°C to 75°C for 8 to 14 hours under vacuum conditions, and preferably, at a temperature of 50°C to 70°C for 9 to 13 hours, but is not limited thereto.

[0089] Next, the steps of preparing an olefin-based polymer under a predetermined ethylene partial pressure are described.

[0090] The step of preparing an olefin-based polymer is performed by polymerizing an olefin-based monomer under a predetermined ethylene partial pressure, and the ethylene partial pressure may be 9.5 bar to 16.5 bar, and preferably, 9.8 bar to 16.2 bar, so as to satisfy the above condition (1). If the ethylene partial pressure is less than 9.5 bar, the mechanical strength may be reduced, and if the ethylene partial pressure is greater than 16.5 bar, the processability may be reduced, and even if the processability is good, the mechanical strength may be reduced and / or the density may be increased.

[0091] In addition, the olefin-based monomer may be selected from C2 to C 20 α-olefins, C1 to C 20 Diolefins, C3 to C 20 Cyclic olefins and C3 to C 20 At least one of the cycloalkadienes, and preferably, it may be at least any one of ethylene, propylene, 1-butene, 1-pentene, 4-methyl-1-pentene, 1-hexene, 1-heptene, 1-octene, 1-decene, 1-undecene, 1-dodecene, 1-tetradecene or 1-hexadecene.

[0092] Meanwhile, the olefin-based polymer prepared by the above-mentioned preparation method may have a melt flow index of 0.5 to 1.5 g / 10 min as measured at 190°C under a load of 2.16 kg according to ASTM D1238 and a melt flow index of 20 to 30 g / 10 min as measured at 190°C under a load of 21.6 kg, so as to satisfy the above condition (1), and preferably, the melt flow index measured at 190°C under a load of 2.16 kg according to ASTM D1238 may be 0.6 to 1.4 g / 10 min, and the melt flow index measured at 190°C under a load of 21.6 kg may be 20.5 to 29 g / 10 min. According to the above ASTM D1238, when satisfying the melt flow index measured at 190° C. under a load of 2.16 kg and the melt flow index measured at 190° C. under a load of 21.6 kg, the olefin-based polymer can simultaneously exhibit the effects of low density, excellent processability, and excellent mechanical strength.

[0093] The method for preparing an olefin-based polymer according to the present invention has been described above, but this is merely an example and may further include additional processes and conditions.

[0094] Furthermore, the present invention provides an olefin-based polymer satisfying the following condition (1).

[0095] As condition (1), 23.49≤ ≤24.762, and preferably, 23.65≤ ≤24.604.

[0096] In this case, in the above condition (1), Pc2 is the ethylene partial pressure (bar), and MFR represents the olefin-based polymer .

[0097] Description of the condition (1) and factors related thereto such as ethylene partial pressure and melt flow index are omitted because they are the same as those described in the above-mentioned method for producing an olefin-based polymer.

[0098] Meanwhile, the olefin-based polymer according to the present invention may also satisfy the following condition (2).

[0099] As condition (2), 1.785≤ ≤2.977, and preferably, 1.809≤ ≤2.858.

[0100] In this case, the drop impact strength in the above condition (2) means the drop impact strength measured according to ASTM D1709.

[0101] If in the above condition (2) Less than 1.785, the mechanical strength of the olefin-based polymer may be poor, and if More than 2.977, the processability of the olefin-based polymer may not be good, and even if the processability is good, the mechanical strength may be reduced and / or the density may be increased.

[0102] Meanwhile, the olefin-based polymer according to the present invention may have a 2 Up to 0.935 kg / m 2 The density of the olefin-based polymer may be 0.916 kg / m 2 to 0.933 kg / m 2 If the density of the olefin-based polymer is less than 0.915 kg / m 2 , the mechanical properties of olefin-based polymers may be poor, and if the density is greater than 0.935 kg / m 2 , the machinability may be poor.

[0103] In addition, the olefin-based polymer according to the present invention can have a drop impact strength of 520 g or more, and preferably 540 g or more. Therefore, despite the low density, it is possible to achieve an effect of having excellent strength. Embodiments of the invention

[0104] Hereinafter, the present invention will be described in more detail through examples, but the following examples do not limit the scope of the present invention and should be construed as helping to understand the present invention.

[0105] <Preparation Example: Preparation of Mixed Catalyst>

[0106] The first compound represented by the following Chemical Formula 1-1 and the second compound represented by the following Chemical Formula 1-2 were purchased from MCN Material Technologies (Shanghai), and the mixed catalyst was prepared without a separate additional purification process. In this case, 8.1 kg of the first compound represented by the following Chemical Formula 1-1 and 3.4 kg of the compound represented by the following Chemical Formula 1-2 were prepared.

[0107] [Chemical Formula 1-1]

[0108]

[0109] [Chemical formula 1-2]

[0110]

[0111] <Example: Preparation of Catalyst>

[0112] The entire amount of the mixed catalyst prepared according to the above Preparation Example and 1800 kg of a cocatalyst solution containing toluene as a solvent and methylaluminoxane as a cocatalyst compound at a concentration of 10% were stirred at 25° C. for 1 hour to prepare a combined catalyst.

[0113] Then, the prepared combined catalyst and 400 kg of silica (XPO-2402) as a carrier were introduced, 1000 L of toluene was further added as a solvent, stirred at 70 °C for 2 hours, washed 3 times with 100 L of toluene, and dried at 60 °C under vacuum for 12 hours to obtain 560 kg of catalyst.

[0114] <Preparation Examples 1 to 4 and Comparative Preparation Examples 1 to 2: Preparation of Olefin-based Polymers>

[0115] The ethylene / 1-hexene polymerization reaction was carried out by using a continuous gas phase polymerization reactor consisting of a fluidized bed. As shown in Tables 1 and 2 below, the input amounts of hydrogen and 1-hexene were adjusted, and the ethylene partial pressure was adjusted to prepare an olefin-based polymer, as shown in Tables 1 and 2.

[0116] <Comparative Preparation Examples 3 and 4>

[0117] A linear low density polyethylene polymer sold by Hanwha Solutions (M1810HN, Hanwha Solutions) was prepared except that each olefin-based polymer was prepared by varying the conditions as shown in Table 2 below.

[0118] <Experimental Example>

[0119] The following physical properties were evaluated for the olefin-based polymers prepared according to the above Preparation Examples and Comparative Preparation Examples, and the results are shown in Tables 1 and 2.

[0120] 1. Melt Flow Index Measurement

[0121] For each of the olefin-based polymers prepared according to the Preparation Examples and the Comparative Preparation Examples, the melt flow index (I 21.6 ), and the melt flow index (I 2.16 ), and then calculate I 21.6 / I 2.16Measure melt flow rate ratio (MFR, processability).

[0122] 2. Density Measurement

[0123] For each of the olefin-based polymers prepared according to the Preparation Examples and Comparative Preparation Examples, the density was measured according to ASTM D1505.

[0124] 3. Measurement of drop impact strength

[0125] For each of the olefin-based polymers prepared according to the Preparation Examples and Comparative Preparation Examples, drop impact strength was measured according to ASTM D1709.

[0126] [Table 1]

[0127] [Table 2]

[0128] As can be determined from Tables 1 and 2 above, it can be seen that Preparation Examples 1 to 4, which satisfy all the preparation conditions and physical properties (ethylene partial pressure, melt flow index ratio, etc.) of the olefin-based polymer of the present invention, simultaneously exhibit remarkably excellent effects in terms of processability and mechanical properties, compared with Comparative Preparation Examples 1 to 4, which do not satisfy even one of the above conditions.

[0129] Meanwhile, Comparative Preparation Example 2 has a decent level of strength and mechanical strength, but this is attributed to a significantly high density, and it can be seen that it does not meet the purpose of the present invention, which is excellent workability, low density, and high strength.

[0130] Although one embodiment of the present invention has been described above, the spirit of the present invention is not limited to the embodiments presented in this specification, and those skilled in the art who understand the concept of the present invention will be able to easily propose other embodiments by modifying, changing, deleting or adding components within the scope of the same concept, but this will also be considered to fall within the scope of the concept of the present invention.

Claims

1. A method for preparing an olefin-based polymer, the method comprising: preparing an olefin-based polymer by polymerizing an olefin-based monomer in the presence of a catalyst at a predetermined ethylene partial pressure, The method satisfies the following conditions (1): ， Wherein in the above condition (1), Pc2 is the ethylene partial pressure (bar), and MFR represents the olefin-based polymer .

2. The method of claim 1, wherein the olefin-based polymer has a melt flow index of 0.5 to 1.5 g / 10 min, as measured at 190° C. under a load of 2.16 kg according to ASTM D1238, and a melt flow index of 20 to 30 g / 10 min, as measured at 190° C. under a load of 21.6 kg.

3. The process according to claim 1, wherein the ethylene partial pressure is from 9.5 bar to 16.5 bar.

4. The method according to claim 1, wherein the catalyst comprises a mixed catalyst comprising a first compound and a second compound different from each other and represented by the following Chemical Formula 1: [Chemical Formula 1] ， Wherein in the above chemical formula 1, M1 is titanium (Ti), zirconium (Zr) or hafnium (Hf), wherein X1 is halogen, substituted or unsubstituted C1 to C5 alkyl, substituted or unsubstituted C2 to C5 alkenyl, substituted or unsubstituted C1 to C5 alkynyl, substituted or unsubstituted C1 to C5 alkoxy, substituted or unsubstituted C6 to C 20 Aryloxy, substituted or unsubstituted C6 to C 20 Aryl, or substituted or unsubstituted C2 to C 20 heteroaryl, where R 1 and R 2 are each independently hydrogen, deuterium, substituted or unsubstituted C1 to C5 alkyl, substituted or unsubstituted C2 to C5 alkenyl, substituted or unsubstituted C1 to C5 alkynyl, substituted or unsubstituted C1 to C5 alkoxy, substituted or unsubstituted C6 to C 20 Aryloxy, substituted or unsubstituted C6 to C 20 Aryl, or substituted or unsubstituted C2 to C 20 Heteroaryl, and wherein a and b are each independently an integer from 1 to 5.

5. The method according to claim 4, wherein the catalyst further comprises a co-catalyst compound, the co-catalyst compound comprising at least any one of a compound represented by the following Chemical Formula 2, a compound represented by the following Chemical Formula 3, and a compound represented by the following Chemical Formula 4: [Chemical Formula 2] ， [Chemical Formula 3] ， [Chemical Formula 4] [L-H] + [Z(A)4] - or [L] + [Z(A)4] - , Wherein in the above chemical formula 2, R 3 is a halogen atom, or a C1 to C 20 a hydrocarbon group, and n is an integer of 2 or greater, Wherein in the above chemical formula 3, M2 is aluminum (Al) or boron (B), and R 4 、R 5 and R 6 are each independently a halogen atom, a halogen-substituted or unsubstituted C1 to C 20 Hydrocarbon, or halogen-substituted or unsubstituted C1 to C 20 Alkoxy, and Wherein in the above chemical formula 4, L is a neutral or cationic Lewis base, [LH] + and [L] + is a Bronsted acid, Z is a Group 13 element, and A is each independently a substituted or unsubstituted C6 to C 20 Aryl, or substituted or unsubstituted C1 to C 20 alkyl. 6 . The method according to claim 5 , wherein the catalyst further comprises a carrier, the carrier supports at least any one of the mixed catalyst and the co-catalyst compound and comprises at least any one of silica, alumina, and magnesia.

7. An olefin-based polymer satisfying the following conditions (1): ， Wherein in the above condition (1), Pc2 is the ethylene partial pressure (bar), and MFR represents the .

8. The olefin-based polymer of claim 7, wherein the olefin-based polymer has a melt flow index of 0.5 to 1.5 g / 10 min, as measured at 190°C under a load of 2.16 kg according to ASTM D1238, and a melt flow index of 20 to 30 g / 10 min, as measured at 190°C under a load of 21.6 kg.

9. The olefin-based polymer according to claim 7, wherein the olefin-based polymer further satisfies the following condition (2): ， Wherein in the above condition (2), Pc2 is the ethylene partial pressure (bar), and the drop impact strength represents the drop impact strength measured according to ASTM D1709.

10. The olefin-based polymer according to any one of claims 7 to 9, wherein the ethylene partial pressure is 9.5 bar to 16.5 bar.

11. The olefin-based polymer according to claim 7, wherein the olefin-based polymer has a 3 Up to 0.935 kg / m 3 density and drop impact strength of 520 g or greater.

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