Olefin-based polymer, film produced therefrom, and method for producing the same

Abstract

The present invention relates to an olefin-based polymer, a film made therefrom, and a method for producing the same. The olefin-based polymer according to a specific example of the present invention has excellent processability, and the film made therefrom, particularly a linear low-density polyethylene film, has excellent mechanical strength and heat-sealing properties, particularly low-temperature heat-sealing properties.

Description

Technical Field

[0001] The present invention relates to an olefin polymer, a film made therefrom, and a method for producing the same. Specifically, the present invention relates to an olefin polymer having excellent processability, an olefin polymer film made therefrom and having excellent heat-sealing strength, particularly low-temperature heat-sealing strength, and a method for producing the same. Background Art

[0002] As one of the catalysts for olefin polymerization, a metallocene catalyst is a compound formed by coordinately bonding ligands such as cyclopentadienyl, indenyl, cycloheptadienyl, etc. to a transition metal or a transition metal halide, and has a sandwich structure as a basic form.

[0003] As another catalyst for olefin polymerization, in the Ziegler-Natta catalyst, the active sites, i.e., the metal components, are dispersed on the surface of an inert solid, and the properties of the active sites are not uniform. In contrast, a metallocene catalyst is a compound having a fixed structure, and is thus known as a single-site catalyst in which all active sites have the same polymerization characteristics. The polymer obtained by polymerization using such a metallocene catalyst has a narrow molecular weight distribution, a uniform comonomer distribution, and a higher copolymerization activity compared to the Ziegler-Natta catalyst.

[0004] On the other hand, linear low-density polyethylene (LLDPE) is produced by copolymerizing ethylene and alpha-olefins at low pressure using a polymerization catalyst. It has a narrow molecular weight distribution, short chain branches (SCBs) of a fixed length, and generally does not have long chain branches (LCBs). Films made of linear low-density polyethylene not only have the characteristics of conventional polyethylene, but also have high tensile strength and elongation at break, and are excellent in tear strength, impact strength, etc. Therefore, they are widely used in stretch films, covering films, etc. where it is difficult to apply existing low-density polyethylene (LDPE) or high-density polyethylene (HDPE).

[0005] However, linear low-density polyethylene produced by a metallocene catalyst has reduced processability due to its narrow molecular weight distribution, and the films made therefrom tend to have reduced heat-sealing properties.

[0006] Therefore, there is a need for an olefin polymer having excellent processability and capable of producing a film having excellent mechanical strength and heat-sealing properties, particularly low-temperature heat-sealing properties. Summary of the Invention

[0007] An object of the present invention is to provide an olefin-based polymer having excellent processability and capable of producing an olefin-based polymer film having excellent mechanical strength and heat-sealing properties, particularly low-temperature heat-sealing properties.

[0008] Another object of the present invention is to provide an olefin-based polymer film made of the above olefin-based polymer, having excellent mechanical strength and heat-sealing properties, particularly low-temperature heat-sealing properties.

[0009] Another object of the present invention is to provide a method for producing the above olefin-based polymer and olefin-based polymer film.

[0010] According to a specific example of the present invention, there is provided an olefin-based polymer having a (1) density of 0.910 to 0.940 g / cm 3 , preferably 0.910 to 0.925 g / cm 3 ; (2) melt index (I 2.16 ) measured at 190 °C under a load of 2.16 kg is 0.5 to 2.0 g / 10 min, preferably 0.8 to 1.5 g / 10 min; (3) the ratio (melt flow ratio; MFR) of the melt index (I 21.6 ) measured at 190 °C under a load of 21.6 kg to the melt index (I 2.16 ) measured under a load of 2.16 kg is 20 to 60, preferably 20 to 50; (4) the comonomer distribution slope (CDS) defined by the following mathematical formula 1 is 3 or more, preferably 3 to 15.

[0011] [Mathematical formula 1]

[0012]

[0013] Wherein, C 20 and C 80 are the comonomer contents at the points where the cumulative weight fractions in the comonomer distribution are 20% and 80% respectively, and M 20 and M 80 are the molecular weights at the points where the cumulative weight fractions in the comonomer distribution are 20% and 80% respectively.

[0014] In a specific example of the present invention, the above-mentioned olefin-based polymer can be produced by polymerizing an olefin-based monomer in the presence of a composite catalyst, and the composite catalyst includes 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.

[0015] [Chemical Formula 1]

[0016]

[0017] [Chemical Formula 2]

[0018]

[0019] [Chemical Formula 3]

[0020]

[0021] In the above Chemical Formula 1 to Chemical Formula 3, M1 and M2 are different from each other and are each independently titanium (Ti), zirconium (Zr), or hafnium (Hf),

[0022] X is each independently a halogen, C 1-20 alkyl, C 2-20 alkenyl, C 2-20 alkynyl, C 6-20 aryl, C 1-20 alkyl C 6-20 aryl, C 6-20 aryl C 1-20 alkyl, C 1-20 alkyl amide group, or C 6-20 aryl amide group,

[0023] R1 to R 10 are each independently hydrogen, substituted or unsubstituted C 1-20 alkyl, substituted or unsubstituted C 2-20 alkenyl, substituted or unsubstituted C 6-20 aryl, substituted or unsubstituted C 1-20 alkyl C 6-20 aryl, substituted or unsubstituted C 6-20 aryl C 1-20 alkyl, substituted or unsubstituted C 1-20 heteroalkyl, substituted or unsubstituted C 3-20 heteroaryl, substituted or unsubstituted C 1-20 alkyl amide group, substituted or unsubstituted C 6-20 aryl amide group, substituted or unsubstituted C 1-20 alkylene, or substituted or unsubstituted C 1-20 silyl, and R1 to R 10Each independently connects adjacent groups and can form a substituted or unsubstituted saturated or unsaturated C 4-20 ring.

[0024] In a specific example of the present invention, M1 and M2 are different from each other, and each is zirconium or hafnium, and X is each a halogen or a C 1-20 alkyl group, and R1 to R 10 can each be hydrogen, a substituted or unsubstituted C 1-20 alkyl group, a substituted or unsubstituted C 1-20 alkenyl group, or a substituted or unsubstituted C 6-20 aryl group.

[0025] In a preferred specific example of the present invention, M1 is hafnium, M2 is zirconium, and X can be chlorine or methyl.

[0026] In a preferred specific example of the present invention, the first transition metal compound can be at least one of the transition metal compounds represented by the following Chemical Formulas 1-1 and 1-2, and the second transition metal compound can be at least one of the transition metal compounds represented by the following Chemical Formulas 2-1, 2-2, and 3-1.

[0027]

[0028] In the above chemical formulas, Me is a methyl group.

[0029] In a specific example of the present invention, the molar ratio of the first transition metal compound to the second transition metal compound is in the range of 100:1 to 1:100.

[0030] In a specific example of the present invention, the above catalyst can contain at least one cocatalyst selected from the compounds represented by the following Chemical Formula 4, the compounds represented by Chemical Formula 5, and the compounds represented by Chemical Formula 6.

[0031] [Chemical Formula 4]

[0032]

[0033] [Chemical Formula 5]

[0034]

[0035] [Chemical Formula 6]

[0036] [L-H] + [Z(A)4] - or [L] + [Z(A)4] -

[0037] In the above Chemical Formula 4, n is an integer of 2 or more, and R a is a halogen atom, C1-20 a hydrocarbyl group, or a C hydrocarbyl group substituted with a halogen 1-20 hydrocarbyl group

[0038] In the above Chemical Formula 5, D is aluminum (Al) or boron (B), and R b , R c and R d are each independently a halogen atom, a C 1-20 hydrocarbyl group, a C hydrocarbyl group substituted with a halogen, or a C 1-20 hydrocarbyl group, or a C 1-20 alkoxy group

[0039] In the above Chemical Formula 6, L is a neutral or cationic Lewis base, [L-H] + and [L] + are Bronsted acids, Z is a Group 13 element, and A is each independently a substituted or unsubstituted C 6-20 aryl group, or a substituted or unsubstituted C 1-20 alkyl group

[0040] In a specific example of the present invention, the above catalyst may further include a support carrying a transition metal compound, a cocatalyst compound, or a support for both of them

[0041] In a preferred specific example of the present invention, the above support may include at least one selected from silica, alumina, and magnesia

[0042] Among them, based on 1 g of the support, the total amount of the composite transition metal compound carried by the support is 0.001 to 1 mmole, and based on 1 g of the support, the total amount of the cocatalyst compound carried by the support is 2 to 15 mmole

[0043] In a specific example of the present invention, the olefin-based polymer is a copolymer of an olefin-based monomer and an olefin-based comonomer. Specifically, the olefin-based monomer is ethylene, and the olefin-based comonomer may be at least one selected from propylene, 1-butene, 1-pentene, 4-methyl-1-pentene, 1-hexene, 1-heptene, 1-octene, 1-decene, 1-undecene, 1-dodecene, 1-tetradecene, and 1-hexadecene. Preferably, the olefin-based polymer is linear low-density polyethylene in which the olefin-based monomer is ethylene and the olefin-based comonomer is 1-hexene

[0044] According to a specific example of the present invention, there is provided a method for producing an olefin-based polymer, including a step of polymerizing an olefin-based monomer in the presence of a composite catalyst to obtain an olefin-based polymer, wherein the composite catalyst includes at least one first transition metal compound represented by the above Chemical Formula 1; and at least one second transition metal compound selected from the compounds represented by the above Chemical Formula 2 and the compounds represented by the above Chemical Formula 3, and the (1) density of the olefin-based polymer is 0.910 to 0.940 g / cm3 , preferably 0.910 to 0.925 g / cm 3 ; (2) The melt index (I 2.16 ) measured at 190 °C under a load of 2.16 kg is 0.5 to 2.0 g / 10 min, preferably 0.8 to 1.5 g / 10 min; (3) The ratio (melt flow ratio; MFR) of the melt index (I 21.6 ) measured at 190 °C under a load of 21.6 kg to the melt index (I 2.16 ) measured under a load of 2.16 kg is 20 to 60, preferably 20 to 50; (4) The comonomer distribution slope (CDS) defined by the above mathematical formula 1 is 3 or more, preferably 3 to 15.

[0045] In a specific example of the present invention, the polymerization of the olefin monomer can be carried out by gas-phase polymerization. Specifically, the polymerization of the olefin monomer can be carried out in a gas-phase fluidized bed reactor.

[0046] According to a specific example of the present invention, there is provided an olefin-based polymer film made of the above olefin-based polymer. The heat seal strength of the olefin-based polymer film measured under the conditions of 0.2 bar, 1.5 seconds and 130 °C is 30 gf / 2.5 cm or more, preferably 30 to 150 gf / 2.5 cm. The heat seal strength measured under the conditions of 0.2 bar, 1.5 seconds and 135 °C is 150 gf / 2.5 cm or more, preferably 150 to 210 gf / 2.5 cm. The hot tack strength at 100 °C is 0.45 N / 2 cm or more, preferably 0.45 to 2.5 N / 2 cm. The hot tack strength at 110 °C is 3.45 N / 2 cm or more, preferably 3.45 to 3.57 N / 2 cm.

[0047] In a specific example of the present invention, the above film may be at least one selected from a stretch film, a covering film, a laminated film, a silage film and an agricultural film.

[0048] According to a specific example of the present invention, there is provided a method for manufacturing an olefin-based polymer film, comprising the following steps: (a) a step of polymerizing an olefin-based monomer in the presence of a composite catalyst to obtain an olefin-based polymer; and (b) a step of forming the olefin-based polymer into a film. The above composite catalyst comprises at least one first transition metal compound represented by the above Chemical Formula 1; and at least one second transition metal compound selected from the compounds represented by the above Chemical Formula 2 and the compounds represented by the above Chemical Formula 3. The heat seal strength of the olefin-based polymer film measured under the conditions of 0.2 bar, 1.5 seconds, and 130 °C is 30 gf / 2.5 cm or more, preferably 30 to 150 gf / 2.5 cm. The heat seal strength measured under the conditions of 0.2 bar, 1.5 seconds, and 135 °C is 150 gf / 2.5 cm or more, preferably 150 to 210 gf / 2.5 cm. The hot tack strength at 100 °C is 0.45 N / 2 cm or more, preferably 0.45 to 2.5 N / 2 cm. The hot tack strength at 110 °C is 3.45 N / 2 cm or more, preferably 3.45 to 3.57 N / 2 cm.

[0049] The processability of the olefin-based polymer according to the specific example of the present invention is excellent, and the mechanical strength and heat seal characteristics, especially the low-temperature heat seal characteristics, of the film made therefrom, especially the linear low-density polyethylene film, are excellent. BRIEF DESCRIPTION OF THE DRAWINGS

[0050] Figure 1 It is a GPC-FTIR chart for explaining the measurement method of CDS defined by Mathematical Formula 1.

[0051] Figures 2 to 6 They are GPC-FTIR charts for CDS measurement of the olefin-based polymers of Examples 1 to 5, respectively.

[0052] Figure 7 and 8 They are GPC-FTIR charts for CDS measurement of Comparative Examples 1 and 2, respectively.

[0053] Figure 9 It is a chart showing the heat seal strength of Examples 1 to 55 and Comparative Examples 1 and 2.

[0054] Figure 10 It is a chart showing the hot tack strength of Examples 1 to 55 and Comparative Examples 1 and 2. DETAILED DESCRIPTION OF THE INVENTION

[0055] Hereinafter, the present invention will be described in more detail.

[0056] Olefin-based polymer

[0057] According to a specific example of the present invention, an olefin-based polymer is provided, and the olefin-based polymer has (1) a density of 0.910 to 0.940 g / cm 3 ; (2) a melt index (I 2.16 ) measured at 190 °C under a load of 2.16 kg is 0.5 to 2.0 g / 10 min; (3) a ratio (melt flow ratio; MFR) of the melt index (I 21.6 ) measured at 190 °C under a load of 21.6 kg to the melt index (I 2.16 ) measured under a load of 2.16 kg is 20 to 60; (4) a comonomer distribution slope (CDS) defined by the following Mathematical Formula 1 is 3 or more.

[0058] In the specific example of the present invention, the density of the olefin-based polymer is 0.910 to 0.940 g / cm 3 . Preferably, the density of the olefin-based polymer can be 0.910 to 0.925 g / cm 3 .

[0059] In the specific example of the present invention, the melt index (I 2.16 ) of the olefin-based polymer measured at 190 °C under a load of 2.16 kg is 0.5 to 2.0 g / 10 min. Preferably, the melt index of the olefin-based polymer measured at 190 °C under a load of 2.16 kg can be 0.8 to 1.5 g / 10 min.

[0060] In the specific example of the present invention, the ratio (melt flow ratio; MFR) of the melt index (I 21.6 ) of the olefin-based polymer measured at 190 °C under a load of 21.6 kg to the melt index (I 2.16 ) measured under a load of 2.16 kg is 20 to 60. Preferably, the MFR of the olefin-based polymer can be 20 to 50.

[0061] In the specific example of the present invention, the comonomer distribution slope (CDS) of the olefin-based polymer defined by the following Mathematical Formula 1 is 3 or more. Preferably, the CDS of the olefin-based polymer can be 3 to 15.

[0062] [Mathematical Formula 1]

[0063]

[0064] In the above Mathematical Formula 1, C 20 and C 80The comonomer contents at the points where the cumulative weight fractions in the comonomer distribution are 20% and 80% respectively, M 20 and M 80 are the molecular weights at the points where the cumulative mass fractions in the comonomer distribution are 20% and 80% respectively.

[0065] The CDS of the olefin-based polymer represents the slope of the comonomer content relative to the molecular weight at the points where the cumulative mass fractions in the comonomer distribution chart are 20% and 80% respectively. The larger the CDS of the olefin-based polymer, the more concentrated the copolymer is in the high molecular chains with large molecular weights, and thus excellent mechanical strength and heat-sealing properties can be obtained.

[0066] Among them, for the comonomer distribution of the olefin-based polymer, a GPC-FTIR device can be used to continuously measure the molecular weight and molecular weight distribution of the polymer together.

[0067] In a specific example of the present invention, the olefin-based polymer can be produced by polymerizing an olefin-based monomer in the presence of a composite catalyst, and the composite catalyst includes 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 compounds represented by the following Chemical Formula 2 and the compounds represented by the following Chemical Formula 3.

[0068] [Chemical Formula 1]

[0069]

[0070] [Chemical Formula 2]

[0071]

[0072] [Chemical Formula 3]

[0073]

[0074] In the above Chemical Formula 1 to Chemical Formula 3, M1 and M2 are different from each other and are each independently titanium (Ti), zirconium (Zr), or hafnium (Hf). Specifically, M1 and M2 are different from each other and can each be zirconium or hafnium. Preferably, M1 is hafnium and M2 can be zirconium.

[0075] X is each independently a halogen, C 1-20 alkyl, C 2-20 alkenyl, C 2-20 alkynyl, C 6-20 aryl, C 1-20 alkyl C 6-20 aryl, C 6-20 aryl C 1-20 alkyl, C 1-20 alkyl amido or C6-20 Aryl amide group. Specifically, each X may be a halogen or a C 1-20 alkyl group. Preferably, X may be chlorine or methyl.

[0076] R1 to R 10 are each independently hydrogen, a substituted or unsubstituted C 1-20 alkyl group, a substituted or unsubstituted C 2-20 alkenyl group, a substituted or unsubstituted C 6-20 aryl group, a substituted or unsubstituted C 1-20 alkyl C 6-20 aryl group, a substituted or unsubstituted C 6-20 aryl C 1-20 alkyl group, a substituted or unsubstituted C 1-20 heteroalkyl group, a substituted or unsubstituted C 3-20 heteroaryl group, a substituted or unsubstituted C 1-20 alkyl amide group, a substituted or unsubstituted C 6-20 aryl amide group, a substituted or unsubstituted C 1-20 alkylene group, or a substituted or unsubstituted C 1-20 silyl group, wherein R1 to R 10 are each independently connected to adjacent groups and may form a substituted or unsubstituted saturated or unsaturated C 4-20 ring. Specifically, R1 to R 10 may each be hydrogen, a substituted or unsubstituted C 1-20 alkyl group, a substituted or unsubstituted C 1-20 alkenyl group, or a substituted or unsubstituted C 6-20 aryl group.

[0077] In a specific example of the present invention, M1 and M2 are different from each other and are each zirconium or hafnium, and each X is a halogen or a C 1-20 alkyl group, and R1 to R 10 may each be hydrogen, a substituted or unsubstituted C 1-20 alkyl group, a substituted or unsubstituted C 1-20 alkenyl group, or a substituted or unsubstituted C 6-20 aryl group.

[0078] In a preferred specific example of the present invention, M1 is hafnium, M2 is zirconium, and X may be chlorine or methyl.

[0079] In a preferred specific example of the present invention, the first transition metal compound is at least one of the transition metal compounds represented by the following Chemical Formulas 1-1 and 1-2, and the second transition metal compound may be at least one of the transition metal compounds represented by the following Chemical Formulas 2-1, 2-2 and 3-1.

[0080]

[0081]

[0082] In the above chemical formula, Me is methyl.

[0083] In a specific example of the present invention, the molar ratio of the first transition metal compound to the second transition metal compound is in the range of 100:1 to 1:100. Preferably, the molar ratio of the first transition metal compound to the second transition metal compound is in the range of 50:1 to 1:50. Preferably, the molar ratio of the first transition metal compound to the second transition metal compound is in the range of 10:1 to 1:10.

[0084] In a specific example of the present invention, the above catalyst may contain at least one cocatalyst compound selected from the compounds represented by the following Chemical Formula 4, the compound represented by Chemical Formula 5, and the compound represented by Chemical Formula 6.

[0085] [Chemical Formula 4]

[0086]

[0087] In the above Chemical Formula 4, n is an integer of 2 or more, and R a may be a halogen atom, C 1-20 hydrocarbon, or C 1-20 hydrocarbon substituted with a halogen. Specifically, R a may be methyl, ethyl, n-butyl, or isobutyl.

[0088] [Chemical Formula 5]

[0089]

[0090] In the above Chemical Formula 5, D is aluminum (Al) or boron (B), and R b , R c and R d are each independently a halogen atom, C 1-20 hydrocarbyl, C 1-20 hydrocarbyl substituted with a halogen, or C 1-20 alkoxy. Specifically, when D is aluminum (Al), R b , R c and R d may each independently be methyl or isobutyl, and when D is boron (B), R b , R c and R d may each be pentafluorophenyl.

[0091] [Chemical Formula 6]

[0092] [L-H] + [Z(A)4] - or [L]+ [Z(A)4] -

[0093] In the above chemical formula 6, L is a neutral or cationic Lewis base, [L-H] + and [L] + are Bronsted acids, Z is a Group 13 element, and A is independently a substituted or unsubstituted C 6-20 aryl, or a substituted or unsubstituted C 1-20 alkyl. Specifically, [L-H] + can be a dimethylanilinium cation, [Z(A)4] - can be [B(C6F5)4] - [L] + can be [(C6H5)3C] + .

[0094] Specifically, examples of the compound represented by the above chemical formula 4 include methylaluminoxane, ethylaluminoxane, isobutylaluminoxane, butylaluminoxane, etc., and methylaluminoxane is preferred, but it is not limited thereto.

[0095] Examples of the compound represented by the above chemical formula 5 include trimethylaluminum, triethylaluminum, triisobutylaluminum, tripropylaluminum, tributylaluminum, dimethylaluminum chloride, triisopropylaluminum, tri-sec-butylaluminum, tricyclopentylaluminum, tripentylaluminum, triisopentylaluminum, trihexylaluminum, trioctylaluminum, ethyldimethylaluminum, methyldiethylaluminum, triphenylaluminum, tri-p-tolylaluminum, dimethylaluminum methanolate, dimethylaluminum ethanolate, trimethylboron, triethylboron, triisobutylboron, tripropylboron, tributylboron, etc., and trimethylaluminum, triethylaluminum, and triisobutylaluminum are preferred, but it is not limited thereto.

[0096] Examples of the compound represented by the above chemical formula 6 include triethylammonium tetraphenylborate, tributylammonium tetraphenylborate, trimethylammonium tetraphenylborate, tripropylammonium tetraphenylborate, trimethylammonium tetrakis(p-tolyl)borate, trimethylammonium tetrakis(o,p-dimethylphenyl)borate, tributylammonium tetrakis(p-trifluoromethylphenyl)borate, trimethylammonium tetrakis(p-trifluoromethylphenyl)borate, tributylammonium tetrakis(pentafluorophenyl)borate, N,N-diethylbenzylammonium tetraphenylborate, N,N-diethylbenzylammonium tetrakis(pentafluorophenyl)borate, diethylammonium tetrakis(pentafluorophenyl)borate, triphenyltetraphenylborate, trimethyltetraphenylborate, triethylammonium tetraphenylaluminate, tributylammonium tetraphenylaluminate, trimethylammonium tetraphenylaluminate, tripropylammonium tetraphenylaluminate, trimethylammonium tetrakis(p-tolyl)aluminate, tripropylammonium tetrakis(p-tolyl)aluminate, triethylammonium tetrakis(o,p-dimethylphenyl)aluminate, tributylammonium tetrakis(p-trifluoromethylphenyl)aluminate, trimethylammonium tetrakis(p-trifluoromethylphenyl)aluminate, tributylammonium tetrakis(pentafluorophenyl)aluminate, N,N-diethylbenzylammonium tetraphenylaluminate, N,N-diethylbenzylammonium tetrakis(pentafluorophenyl)aluminate, diethylammonium tetrakis(pentafluorophenyl)aluminate, triphenyltetraphenylaluminate, trimethyltetraphenylaluminate, tripropylammonium tetrakis(p-tolyl)borate, triethylammonium tetrakis(o,p-dimethylphenyl)borate, tributylammonium tetrakis(p-trifluoromethylphenyl)borate, triphenylcarbenium tetrakis(p-trifluoromethylphenyl)borate, triphenylcarbenium tetrakis(pentafluorophenyl)borate, and the like.

[0097] In a specific example of the present invention, the above catalyst may further include a carrier supporting a transition metal compound, a cocatalyst compound, or both of them. Specifically, the carrier may support all of the transition metal compound and the cocatalyst compound.

[0098] At this time, the carrier may include a substance having a hydroxyl group on its surface. Preferably, a substance having a hydroxyl group and a siloxanyl group with high reactivity and having been dried to remove moisture on the surface can be used. For example, the carrier may include at least one selected from silica, alumina, and magnesia. Specifically, silica dried at a high temperature, silica-alumina, and silica-magnesia can be used as the carrier, and they usually may contain oxide, carbonate, sulfate, and nitrate components such as Na2O, K2CO3, BaSO4, and Mg(NO3)2. In addition, they may also include carbon, zeolite, magnesium chloride, and the like. However, the carrier is not limited thereto, and there is no particular limitation as long as it can support the transition metal compound and the cocatalyst compound.

[0099] The average particle size of the carrier may be 10 to 250 μm. Preferably, the average particle size may be 10 to 150 μm, and more preferably, it may be 20 to 100 μm.

[0100] The micropore volume of the carrier may be 0.1 to 10 cc / g, preferably 0.5 to 5 cc / g, and more preferably 1.0 to 3.0 cc / g.

[0101] The specific surface area of the carrier can be 1 to 1000 m 2 / g, preferably 100 to 800 m 2 / g, more preferably 200 to 600 m 2 / g.

[0102] In a preferred specific example of the present invention, the carrier can be silica. At this time, the drying temperature of the silica can be 200 to 900 °C. The drying temperature is preferably 300 to 800 °C, more preferably 400 to 700 °C. When the drying temperature is less than 200 °C, there is too much moisture, and the moisture on the surface reacts with the cocatalyst compound. When it is greater than 900 °C, the structure of the carrier may disintegrate.

[0103] The concentration of hydroxyl groups in the dried silica can be 0.1 to 5 mmole / g, preferably 0.7 to 4 mmole / g, more preferably 1.0 to 2 mmole / g. When the concentration of hydroxyl groups is less than 0.1 mmole / g, the loading amount of the cocatalyst compound becomes low. When it is greater than 5 mmole / g, there may be a problem of deactivation of the catalyst components.

[0104] Based on 1 g of the carrier, the total amount of the transition metal compound supported on the carrier can be 0.001 to 1 mmole. When the ratio of the transition metal compound to the carrier satisfies the above range, appropriate supported catalyst activity is exhibited, which is advantageous in maintaining catalyst activity and economy.

[0105] Based on 1 g of the carrier, the total amount of the cocatalyst compound supported on the carrier can be 2 to 15 mmole. When the ratio of the cocatalyst compound to the carrier satisfies the above range, it is advantageous in maintaining catalyst activity and economy.

[0106] One or more than two kinds of carriers can be used. For example, the transition metal compound and the cocatalyst compound can be both supported on one kind of carrier, or the transition metal compound and the cocatalyst compound can be respectively supported on two or more kinds of carriers. In addition, only one of the transition metal compound and the cocatalyst compound can be supported on the carrier.

[0107] As a method for supporting the transition metal compound and / or the cocatalyst compound that can be used in the olefin polymerization catalyst, a physical adsorption method or a chemical adsorption method can be used.

[0108] For example, the physical adsorption method may be the following methods: a method of contacting a solution in which a transition metal compound is dissolved with a carrier and then drying; a method of contacting a solution in which a transition metal compound and a cocatalyst compound are dissolved with a carrier and then drying; or a method of contacting a solution in which a transition metal compound is dissolved with a carrier and then drying to produce a carrier supporting the transition metal compound, and separately, contacting a solution in which a cocatalyst compound is dissolved with a carrier and then drying to produce a carrier supporting the cocatalyst compound, and then mixing them, etc.

[0109] The chemical adsorption method may be the following methods: a method of first supporting a cocatalyst compound on the surface of a carrier and then supporting a transition metal compound on the cocatalyst compound; or a method of covalently bonding a functional group on the surface of the carrier (for example, when using silica, the hydroxyl group (-OH) on the silica surface) to a catalyst compound, etc.

[0110] In a specific example of the present invention, the olefin-based polymer may be a homopolymer of an olefin-based monomer or a copolymer of an olefin-based monomer and a comonomer. Preferably, the olefin-based polymer is a copolymer of an olefin-based monomer and an olefin-based comonomer.

[0111] Among them, the olefin-based monomer may be selected from C 2-20 alpha-olefin, C 1-20 diolefin, C 3-20 cycloolefin, and C 3-20 cyclodiolefin, at least one of which.

[0112] For example, the olefin-based monomer may be 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, etc. The olefin-based polymer may be a homopolymer containing only one of the above-exemplified olefin-based monomers, or may be a copolymer containing two or more of the above olefin-based monomers.

[0113] In an exemplary embodiment, the olefin-based polymer may be a copolymer formed by copolymerizing ethylene and C 3-20 alpha-olefin. Preferably, the olefin-based polymer may be linear low-density polyethylene in which the olefin-based monomer is ethylene and the olefin-based comonomer is 1-hexene.

[0114] At this time, the content of ethylene is preferably 55 to 99.9% by weight, more preferably 90 to 99.9% by weight. The content of the alpha-olefin-based comonomer is preferably 0.1 to 45% by weight, more preferably 0.1 to 10% by weight.

[0115] Process for producing olefin polymer

[0116] According to a specific example of the present invention, there is provided a process for producing an olefin polymer, comprising a step of polymerizing an olefin monomer in the presence of a composite catalyst to obtain an olefin polymer, wherein the composite catalyst comprises 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.

[0117] [Chemical Formula 1]

[0118]

[0119] [Chemical Formula 2]

[0120]

[0121] [Chemical Formula 3]

[0122]

[0123] In the above chemical formulas, M1, M2, X, and R1 to R 10 are the same as those described in the above olefin polymer item.

[0124] As described above, the (1) density of the olefin polymer produced by the production method according to a specific example of the present invention is 0.910 to 0.940 g / cm 3 , preferably 0.910 to 0.925 g / cm 3 ; (2) the melt index (I 2.16 ) measured at 190 °C under a load of 2.16 kg is 0.5 to 2.0 g / 10 min, preferably 0.8 to 1.5 g / 10 min; (3) the ratio (melt flow ratio; MFR) of the melt index (I 21.6 ) measured at 190 °C under a load of 21.6 kg to the melt index (I 2.16 ) measured under a load of 2.16 kg is 20 to 60, preferably 20 to 50; (4) the comonomer distribution slope (CDS) defined by the following Mathematical Formula 1 is 3 or more, preferably 3 to 15.

[0125] [Mathematical Formula 1]

[0126]

[0127] C in the above Mathematical Formula 1 20 , C 80 , M20 and M 80 It is the same as that described in the above olefin-based polymer project.

[0128] In a specific example of the present invention, the olefin-based polymer can be polymerized by, for example, polymerization reactions such as free radical, cationic, coordination, condensation, addition, etc., but is not limited thereto.

[0129] As an embodiment of the present invention, the olefin-based polymer can be manufactured by gas phase polymerization method, solution polymerization method or slurry polymerization method, etc. Preferably, the polymerization of the olefin-based monomer can be carried out by gas phase polymerization. Specifically, the polymerization of the olefin-based monomer can be carried out in a gas phase fluidized bed reactor.

[0130] When the olefin-based polymer is manufactured by solution polymerization method or slurry polymerization method, examples of the solvent that can be used include C such as pentane, hexane, heptane, nonane, decane and their isomers 5-12 aliphatic hydrocarbon solvents; aromatic hydrocarbon solvents such as toluene and benzene; hydrocarbon solvents substituted by chlorine atoms such as dichloromethane and chlorobenzene; and mixtures thereof, etc., but are not limited thereto.

[0131] Olefin-based polymer film

[0132] According to a specific example of the present invention, there is provided an olefin-based polymer film which is manufactured by molding the above olefin-based polymer. The heat seal strength of the olefin-based polymer film measured under the conditions of 0.2 bar, 1.5 seconds and 130 °C is 30 gf / 2.5 cm or more, and the heat seal strength measured under the conditions of 0.2 bar, 1.5 seconds and 135 °C is 150 gf / 2.5 cm or more. The hot tack strength at 100 °C is 0.45 N / 2 cm or more, and the hot tack strength at 110 °C is 3.45 N / 2 cm or more.

[0133] In a specific example of the present invention, the heat seal strength of the olefin-based polymer film measured under the conditions of 0.2 bar, 1.5 seconds and 130 °C according to ASTM F88 is 30 gf / 2.5 cm or more. Preferably, the heat seal strength (130 °C) of the olefin-based polymer film can be 30 - 150 gf / 2.5 cm.

[0134] In a specific example of the present invention, the heat seal strength of the olefin-based polymer film measured according to ASTM F88 under the conditions of 0.2 bar, 1.5 seconds, and 135 °C is 150 gf / 2.5 cm or more. Preferably, the heat seal strength (135 °C) of the olefin-based polymer film can be 150 to 210 gf / 2.5 cm.

[0135] In a specific example of the present invention, the hot tack strength of the olefin-based polymer film at 100 °C measured according to ASTM F1921 is 0.45 N / 2 cm or more. Preferably, the hot tack strength of the olefin-based polymer film at 100 °C can be 0.45 to 2.5 N / 2 cm.

[0136] In a specific example of the present invention, the hot tack strength of the olefin-based polymer film at 110 °C measured according to ASTM F1921 is 3.45 N / 2 cm or more. Preferably, the hot tack strength of the olefin-based polymer film at 110 °C can be 3.45 to 3.57 N / 2 cm.

[0137] The olefin-based polymer film according to a specific example of the present invention contains the above-mentioned olefin-based polymer, and thus has excellent mechanical properties and heat seal characteristics. The above-mentioned olefin-based polymer has a relatively wide molecular weight distribution, and there are relatively many short branches in the high molecular weight component. Therefore, it can be understood that the mechanical strength and low-temperature heat seal characteristics of the olefin-based polymer film manufactured therefrom are excellent.

[0138] In a specific example of the present invention, the olefin-based polymer film can be effectively used as a stretch film, a covering film, a laminated film, a silage film, an agricultural film, etc.

[0139] Manufacturing method of olefin-based polymer film

[0140] According to a specific example of the present invention, a method for manufacturing an olefin-based polymer film is provided, including the following steps: (a) a step of polymerizing an olefin-based monomer in the presence of a composite catalyst to obtain an olefin-based polymer; and (b) a step of forming the olefin-based polymer into a film. The above composite catalyst includes 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 compounds represented by the following Chemical Formula 2 and the compounds represented by the following Chemical Formula 3. And the heat seal strength of the olefin-based polymer film measured under the conditions of 0.2 bar, 1.5 seconds, and 130 °C is 30 gf / 2.5 cm or more, preferably 30 - 150 gf / 2.5 cm; the heat seal strength measured under the conditions of 0.2 bar, 1.5 seconds, and 135 °C is 150 gf / 2.5 cm or more, preferably 150 - 210 gf / 2.5 cm; the hot tack strength at 100 °C is 0.45 N / 2 cm or more, preferably 0.45 - 2.5 N / 2 cm; and the hot tack strength at 110 °C is 3.45 N / 2 cm or more, preferably 3.45 - 3.57 N / 2 cm.

[0141] [Chemical Formula 1]

[0142]

[0143] [Chemical Formula 2]

[0144]

[0145] [Chemical Formula 3]

[0146]

[0147] In the above chemical formulas, M1, M2, X, and R1 to R 10 are the same as those described in the above olefin polymer item.

[0148] In the above step (a), the transition metal compound, the olefin-based monomer, and its polymerization method are the same as those described in the above olefin polymer item and the method for manufacturing an olefin-based polymer item.

[0149] In the above step (b), the forming method of the olefin-based polymer film according to the specific example of the present invention is not particularly limited, and a forming method known in the technical field to which the present invention belongs can be used. For example, the above olefin-based polymer can be processed by conventional methods such as blown film forming, extrusion forming, and casting forming to manufacture an olefin-based polymer film. Among them, blown film forming is most preferred.

[0150] The characteristics of the olefin-based polymer film obtained by the method for producing an olefin-based polymer film according to a specific example of the present invention are the same as those described in the above item of the olefin-based polymer film.

[0151] Mode for Carrying Out the Invention

[0152] Examples

[0153] Hereinafter, the present invention will be described in more detail by way of examples. However, the following examples are only for illustrating the present invention, and the scope of the present invention is not limited thereto.

[0154] Production Examples

[0155] The transition metal compound of Chemical Formula 1-1 (bis(n-propylcyclopentadienyl)hafnium dichloride) and the transition metal compound of Chemical Formula 2-1 (bis(n-butylcyclopentadienyl)zirconium dichloride) were purchased from TCI. The transition metal compound of Chemical Formula 1-2 (dimethylbis(n-propylcyclopentadienyl)hafnium dichloride), the transition metal compound of Chemical Formula 2-2 (bis(i-butylcyclopentadienyl)zirconium dichloride), and the transition metal compound of Chemical Formula 3-1 ((pentamethylcyclopentadienyl)(n-propylcyclopentadienyl)zirconium dichloride) were purchased from MCN and used without further purification process.

[0156] Production Example 1

[0157] Into 4.47 g of the transition metal compound of Chemical Formula 1-1 and 1.67 g of the transition metal compound of Chemical Formula 2-1, 892 g of a toluene solution of 10% methylaluminoxane was added, and the mixture was stirred at room temperature for 1 hour. The solution after the reaction was added to 200 g of silica (XPO-2402), 1.5 liters of toluene was further added, and the mixture was stirred at 70 °C for 2 hours. The supported catalyst was washed with 500 ml of toluene and dried under vacuum at 60 °C overnight to obtain 280 g of a supported catalyst in powder form.

[0158] Production Example 2

[0159] 4.47 g of the transition metal compound of Chemical Formula 1-1 and 1.67 g of the transition metal compound of Chemical Formula 2-2 were used. Other than this, 277 g of the supported catalyst was obtained by the same method as in Production Example 1.

[0160] Production Example 3

[0161] 4.47 g of the transition metal compound of Chemical Formula 1-1 and 1.68 g of the transition metal compound of Chemical Formula 3-1 were used. Other than this, 280 g of the supported catalyst was obtained by the same method as in Production Example 1.

[0162] Production Example 4

[0163] 4.07 g of the transition metal compound of Chemical Formula 1-2 and 1.67 g of the transition metal compound of Chemical Formula 2-2 were used. Other than this, 282 g of the supported catalyst was obtained by the same method as in Production Example 1.

[0164] Production Example 5

[0165] 4.07 g of the transition metal compound of Chemical Formula 1-2 and 1.68 g of the transition metal compound of Chemical Formula 3-1 were used. Other than this, 279 g of the supported catalyst was obtained by the same method as in Production Example 1.

[0166] Examples 1 to 5

[0167] Using a gas-phase fluidized bed reactor, ethylene / 1-hexene copolymers were produced in the presence of the supported catalysts respectively obtained in Production Examples 1 to 5. The ethylene partial pressure in the reactor was maintained at about 15 kg / cm 2 , and the polymerization temperature was maintained at 80 to 90 °C.

[0168] The polymerization conditions of the above examples are shown in Table 1 below.

[0169] [Table 1]

[0170] Example 1 Example 2 Example 3 Example 4 Example 5 Catalyst Production Example 1 Production Example 2 Production Example 3 Production Example 4 Production Example 5 Polymerization temperature (°C) 85.1 84.6 84.3 84.8 85.2 Empty tower gas velocity (m / s) 53.2 53.1 53.4 53.2 53.2 Production rate (kg / h) 10.1 9.9 10.0 9.7 10.3 <![CDATA[Ethylene pressure (kg / cm 2 )]]> 14.18 14.12 14.13 14.21 14.13 Hydrogen / ethylene molar ratio 0.03 0.03 0.05 0.03 0.05 1-Hexene / ethylene molar ratio 1.32 1.23 1.37 1.17 1.47 Catalyst activity (gPE / gCat) 3,489 3,171 3,780 5,185 4,802 Bulk density (g / cc) 0.413 0.426 0.434 0.415 0.433

[0171] Comparative Examples 1 to 2

[0172] For comparison, linear low-density polyethylene M1810HN (density 0.9180 g / cm 3 , melt index 1.0 g / 10 min; Comparative Example 1) and M2010HN (density 0.9200 g / cm 3, melt index 1.0 g / 10 min; Comparative Example 2).

[0173] Test Example

[0174] The physical properties of the olefin polymers of the above Examples were measured according to the methods and standards described below. The results are shown in Table 2 below.

[0175] (1) Density

[0176] Measurement was carried out according to ASTM D1505.

[0177] (2) Melt index and melt flow ratio (MFR)

[0178] According to ASTM D 1238, the melt index was measured at 190 °C using a load of 21.6 kg and a load of 2.16 kg, respectively, and the ratio (MI 21.6 / MI 2.16 ) was obtained.

[0179] (3) Copolymer monomer distribution slope (CDS)

[0180] Measurement was carried out at 170 °C using gel permeation chromatography - Fourier transform infrared absorption spectroscopy (GPC-FTIR).

[0181] (4) Melting temperature

[0182] The melting point of the polymer was measured using a differential scanning calorimeter (DSC, equipment name: DSC2920, manufacturing company: TA instrument). Specifically, after heating the polymer to 200 °C, the temperature was maintained for 5 minutes, then cooled back to 20 °C, and then the temperature was raised again. At this time, the heating rate and cooling rate were adjusted to 20 °C / min, respectively.

[0183] [Table 2]

[0184]

[0185] Films with a thickness of 50 μm were produced from the resins of Examples 1 to 5 and Comparative Examples 1 to 2 using a 40 mm blown film extruder (40 mm Φ screw, 75 mm Φ die, 2 mm die gap). At this time, the extrusion conditions were fixed as C1 / C2 / C3 / A / D1 / D2 = 160 / 165 / 170 / 175 / 180 / 180 °C, rotational speed 60 rpm, blow-up ratio (BUR) 2.

[0186] The physical properties of the olefin-based polymer films of the above-described examples and comparative examples were measured according to the methods and standards described below. The results are shown in Table 3 below.

[0187] (5) Haze

[0188] The film was formed in a thickness of 50 μm and measured according to ASTM D 1003. At this time, each test piece was measured 5 times and the average value was taken.

[0189] (6) Transparency

[0190] The film was formed in a thickness of 50 μm and measured according to ASTM D01003. At this time, each test piece was measured 5 times and the average value was taken.

[0191] (7) Heat seal strength

[0192] Measured according to ASTM F88.

[0193] (8) Heat tack strength

[0194] Measured according to ASTM F1921.

[0195] [Table 3]

[0196]

[0197] Industrial applicability

[0198] The processability of the olefin-based polymer according to the specific examples of the present invention is excellent, and the olefin-based polymer film produced therefrom, specifically, the mechanical strength and heat seal characteristics, particularly the low-temperature heat seal characteristics, of the linear low-density polyethylene film are excellent.

Claims

1. An olefin-based polymer, the olefin-based polymer having (1) a density of 0.910 to 0.940 g / cm 3 ; (2) a melt index (I 2.16 ) measured at 190 °C under a load of 2.16 kg of 0.5 to 2.0 g / 10 min; (3) a ratio of the melt index (I 21.6 ) measured at 190 °C under a load of 21.6 kg to the melt index (1 2.16 ) measured under a load of 2.16 kg, i.e., MFR, of 20 to 60; (4) a comonomer distribution slope defined by the following mathematical formula 1, i.e., CDS, of 3 or more, Among them, The olefin-based polymer is produced by polymerizing an olefin-based monomer in the presence of a composite catalyst, and the composite catalyst includes: at least one first transition metal compound which is at least one of the transition metal compounds represented by the following Chemical Formulas 1-1 and 1-2; and at least one second transition metal compound which is at least one of the transition metal compounds represented by the following Chemical Formulas 2-1, 2-2 and 3-1: In the said chemical formulas, Me is methyl, [Mathematical Formula 1] Among them, C 20 and C 80 are the comonomer contents at the points where the cumulative mass fractions in the comonomer distribution are 20% and 80% respectively, and M 20 and M 80 are the molecular weights at the points where the cumulative mass fractions in the comonomer distribution are 20% and 80% respectively.

2. The olefin-based polymer according to claim 1, wherein, (1) The density of the olefin polymer is 0.910 to 0.925 g / cm 3 ; (2) The melt index measured at a load of 2.16 kg at 190 °C is 0.8 to 1.5 g / 10 min; (3) MFR is 20 to 50; (4) CDS is 3 to 15.

3. The olefin-based polymer according to claim 1, wherein, The molar ratio of the first transition metal compound to the second transition metal compound ranges from 100:1 to 1:

100.

4. The olefin polymer according to claim 1, wherein The catalyst includes at least one cocatalyst compound selected from the compounds represented by the following Chemical Formula 4, the compounds represented by Chemical Formula 5 and the compounds represented by Chemical Formula 6, [Chemical Formula 4] [Chemical Formula 5] [Chemical Formula 6] [L-H] + [Z(A)4] - or [L] + [Z(A)4] - In the chemical formula 4, n is an integer of 2 or more, and R a is a halogen atom, C 1-20 hydrocarbon group, or C 1-20 hydrocarbon group substituted by a halogen, In Chemical Formula 5, D is aluminum (Al) or boron (B), and R b , R c and R d are each independently a halogen atom, a C 1-20 hydrocarbyl group, a C hydrocarbyl group substituted with a halogen, or a C 1-20 hydrocarbyl group, or a C 1-20 alkoxy group. In Chemical Formula 6, L is a neutral or cationic Lewis base, [L-H] + and [L] + are Bronsted acids, Z is a Group 13 element, and each A is independently a substituted or unsubstituted C 6-20 aryl, or a substituted or unsubstituted C 1-20 alkyl.

5. The olefin polymer according to claim 4, wherein The catalyst further includes a carrier supporting the transition metal compound, the cocatalyst compound, or both of them.

6. The olefin polymer according to claim 5, wherein The carrier includes at least one selected from silica, alumina and magnesia.

7. The olefin-based polymer according to claim 5, wherein Based on 1 g of the carrier, the total amount of the composite transition metal compound supported by the carrier is 0.001 to 1 mmole, and based on 1 g of the carrier, the total amount of the cocatalyst compound supported by the carrier is 2 to 15 mmole.

8. The olefin-based polymer according to claim 1, wherein, The olefin-based polymer is a copolymer of an olefin-based monomer and an olefin-based comonomer.

9. The olefin-based polymer according to claim 8, wherein The olefin-based monomer is ethylene, and the olefin-based comonomer is one or more selected from propylene, 1-butene, 1-pentene, 4-methyl-1-pentene, 1-hexene, 1-heptene, 1-octene, 1-decene, 1-undecene, 1-dodecene, 1-tetradecene and 1-hexadecene.

10. The olefin-based polymer according to claim 9, wherein, The olefin-based polymer is linear low density polyethylene, the olefin-based monomer is ethylene, and the olefin-based comonomer is 1-hexene.

11. A method for manufacturing an olefin-based polymer, comprising a step of polymerizing an olefin-based monomer in the presence of a composite catalyst, wherein the composite catalyst comprises: at least one first transition metal compound which is at least one of transition metal compounds represented by the following Chemical Formula 1-1 and 1-2; and at least one second transition metal compound which is at least one of transition metal compounds represented by the following Chemical Formula 2-1, 2-2 and 3-1, and the olefin-based polymer has (1) a density of 0.910 to 0.940 g / cm 3 ; (2) a melt index (I 2.16 ) measured at 190 °C under a load of 2.16 kg of 0.5 to 2.0 g / 10 min; (3) a ratio of the melt index (I 21.6 ) measured at 190 °C under a load of 21.6 kg to the melt index (I 2.16 ) measured under a load of 2.16 kg of 20 to 60; (4) a comonomer distribution slope (CDS) defined by the following Mathematical Formula 1 of 3 or more: In the said chemical formulas, Me is methyl, [Mathematical Formula 1] The C in the mathematical formula 1 20 , C 80 , M 20 and M 80 are the same as those defined in claim 1.

12. The method for producing an olefin polymer according to claim 11, wherein, The polymerization of the olefin-based monomer is carried out by gas phase polymerization.

13. An olefin-based polymer film is made of the olefin-based polymer according to Claim 1, and the heat seal strength measured under the conditions of 0.2 bar, 1.5 seconds and 130 °C is 30 gf / 2.5 cm or more, the heat seal strength measured under the conditions of 0.2 bar, 1.5 seconds and 135 °C is 150 gf / 2.5 cm or more, the hot tack strength at 100 °C is 0.45 N / 2 cm or more, and the hot tack strength at 110 °C is 3.45 N / 2 cm or more.

14. The olefin-based polymer film according to claim 13, wherein The heat seal strength measured under the conditions of 0.2 bar, 1.5 seconds and 130 °C is 30 to 150 gf / 2.5 cm, the heat seal strength measured under the conditions of 0.2 bar, 1.5 seconds and 135 °C is 150 to 210 gf / 2.5 cm, the hot tack strength at 100 °C is 0.45 to 2.5 N / 2 cm, and the hot tack strength at 110 °C is 3.45 to 3.57 N / 2 cm.

15. The olefin-based polymer film according to claim 14, wherein The olefin-based polymer film is at least one selected from a stretch film, a covering film, a laminated film, a silage film and an agricultural film.

16. A method for manufacturing an olefin-based polymer film, comprising the following steps: (a) a step of polymerizing an olefin-based monomer in the presence of a composite catalyst to obtain an olefin-based polymer; and (b) a step of forming the olefin-based polymer into a film, wherein the composite catalyst comprises: at least one first transition metal compound selected from the compounds represented by the following Chemical Formulas 1-1 and 1-2; and at least one second transition metal compound selected from the compounds represented by the following Chemical Formulas 2-1, 2-2, and 3-1, and the olefin-based polymer film has a heat seal strength of 30 gf / 2.5 cm or more when 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 when 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: In the said chemical formulas, Me is a methyl group.

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