KR20200093304A - Polyolefin - Google Patents

Abstract

The present invention relates to a polyolefin. More particularly, the present invention relates to a polyolefin which has excellent drop impact strength and is capable of exhibiting improved transparency.

Description

Polyolefin {POLYOLEFIN}

The present invention relates to polyolefins. More specifically, the present invention relates to a polyolefin having improved mechanical properties such as excellent drop impact strength and capable of exhibiting improved transparency in film production.

Linear low density polyethylene (LLDPE) is manufactured by copolymerizing ethylene and alpha olefin at a low pressure using a polymerization catalyst, and is a resin having a narrow molecular weight distribution, a short chain branch of a certain length, and no long chain branch. Linear low-density polyethylene film, along with the characteristics of general polyethylene, has high breaking strength and elongation, excellent tear strength, drop impact strength, etc., which makes it difficult to apply conventional low-density polyethylene or high-density polyethylene to stretch films and overlap films. Doing.

However, linear low-density polyethylene has the disadvantage of poor blown film processability and poor transparency compared to excellent mechanical properties. The blown film is a film produced by blowing air into a molten plastic and inflating it, also called an inflation film.

On the other hand, linear low-density polyethylene generally has a characteristic that the lower the density, the higher the transparency and drop impact strength. However, when a large amount of alpha olefin comonomer is used to produce low-density polyethylene, there are problems such as a high frequency of fouling in the slurry polymerization process.

On the other hand, in order to improve the processability, it is possible to improve the processing properties through the introduction of a long chain branch (LCB) in linear low density polyethylene, but when there are many LCBs, the transparency and drop impact strength are inferior.

Therefore, there is a need for the development of polyethylene capable of realizing excellent mechanical properties such as drop impact strength with low density and transparency.

Korean Patent Publication No. 2010-0102854

In order to solve the problems of the prior art, the present invention is to provide a polyolefin capable of exhibiting improved mechanical properties, such as low density, excellent drop impact strength, and improved transparency in film production.

In order to solve the above problems, the present invention,

Density from 0.915 g/cm ³ to 0.930 g/cm ³ ; And

In the case of SSA (Successive Self-nucleation and Annealing) analysis, the ethylene sequence (inhomogeneity, I) calculated by Equation 1 below is 1.25 to 1.40,

Provides polyolefin:

[Equation 1]

Inhomogeneity (I) = L _w / L _n

In the above formula 1,

L _w is the weighted average of the Ethylene Sequence Length (ESL), and L _n is the arithmetic mean of the Ethylene Sequence Length (ESL) (unit: nm).

According to the present invention, it is possible to provide a polyolefin having optimal ethylene sequence heterogeneity by appropriately adjusting the length and distribution of an ethylene sequence forming a lamellar during polyolefin polymerization using a metallocene catalyst. have.

Accordingly, a polyolefin having excellent transparency and high drop impact strength can be provided.

FIG. 1 is a graph showing the relationship between inhomogeneity of polyolefin and drop impact strength according to Examples and Comparative Examples of the present invention.
2 is a graph showing the temperature profile of the SSA assay according to an embodiment of the present invention.

In the present invention, terms such as first and second are used to describe various components, and the terms are used only for the purpose of distinguishing one component from other components.

In addition, the terms used herein are only used to describe exemplary embodiments, and are not intended to limit the present invention. Singular expressions include plural expressions unless the context clearly indicates otherwise. In this specification, the terms “include”, “have” or “have” are intended to indicate the presence of implemented features, numbers, steps, elements, or combinations thereof, one or more other features or It should be understood that the existence or addition possibilities of numbers, steps, elements, or combinations thereof are not excluded in advance.

The present invention can be applied to various changes and may have various forms, and specific embodiments will be illustrated and described in detail below. However, this is not intended to limit the present invention to a specific disclosure form, and it should be understood that all modifications, equivalents, and substitutes included in the spirit and scope of the present invention are included.

Hereinafter, the polyolefin of the present invention will be described in detail.

Polyolefin according to an embodiment of the present invention, the density of 0.915 g / cm ³ to 0.930 g / cm ³ ; And SSA (Successive Self-nucleation and Annealing) analysis, characterized in that the heterogeneity (inhomogeneity, I) of the ethylene sequence (ethylene sequence) calculated by Equation 1 below is 1.25 to 1.40.

[Equation 1]

Inhomogeneity (I) = Lw / Ln

In the above formula 1,

L _w is the weighted average of the Ethylene Sequence Length (ESL), and L _n is the arithmetic mean of the Ethylene Sequence Length (ESL) (unit: nm).

Linear low density polyethylene (LLDPE) is a resin produced by copolymerizing ethylene and alpha olefin at a low pressure using a polymerization catalyst, and having a narrow molecular weight distribution and a short chain branch of a constant length. Linear low-density polyethylene film, along with the characteristics of general polyethylene, has high breaking strength and elongation, excellent tear strength, drop impact strength, etc., which makes it difficult to apply conventional low-density polyethylene or high-density polyethylene to stretch films and overlap films. Doing.

On the other hand, linear low-density polyethylene is generally known to have a lower density, which increases transparency and drop impact strength. However, if a large amount of comonomer is used to produce low-density polyethylene, the frequency of fouling in the slurry polymerization process increases, and the amount of anti-blocking agent needs to be increased due to stickiness when producing a film containing the same. There is a problem. In addition, there is a problem in that the process is unstable during production or the morphology characteristics of the resulting polyethylene are lowered, resulting in a decrease in bulk density.

Accordingly, in the present invention, the optimum ratio of ASL (Average Ethylene Sequence Length) that can increase transparency and drop impact strength by appropriately adjusting the length and distribution of the ethylene sequence forming a lamellar while having low density characteristics It is intended to provide a polyolefin having.

Specifically, the polyolefin according to an embodiment of the present invention has a density of 0.915 g/cm ³ or more and 0.930 g/cm ³ or less. That is, the present invention may be a low density polyolefin having a density of 0.930 g/cm ³ or less.

According to an embodiment of the present invention, the polyolefin may be, for example, a copolymer of ethylene and alpha olefin. At this time, the alpha olefin is propylene, 1-butene, 1-pentene, 4-methyl-1-pentene, 1-hexene, 1-heptene, 1-octene, 1-decene, 1-undecene, 1-dodecene, 1-tetradecene, 1-hexadecene, 1-eicocene, norbornene, norbornadiene, ethylidene novoden, phenyl novoden, vinyl novoden, dicyclopentadiene, 1,4-butadiene, 1,5- It may include pentadiene, 1,6-hexadiene, styrene, alpha-methylstyrene, divinylbenzene, and 3-chloromethylstyrene. Among them, the polyolefin may be a copolymer of ethylene and 1-butene, a copolymer of ethylene and 1-hexene, or a copolymer of ethylene and 1-octene.

More specifically, according to one embodiment, the density of the polyolefin of the present invention is 0.915 g/cm ³ or more, or 0.916 g/cm ³ or more, or 0.917 g/cm ³ or more, or 0.918 g/cm ³ or more, or, 0.919 g/cm ³ or more, 0.930 g/cm ³ or less, or 0.928 g/cm ³ or less, or 0.925 g/cm ³ or less, or 0.922 g/cm ³ or less, or 0.921 g/cm ³ or less, or 0.920 g /cm ³ or less. At this time, the density is a value measured according to ASTM D1505.

According to one embodiment, the polyolefin of the present invention is characterized in that the heterogeneity (inhomogeneity, I) of the ethylene sequence (ethylene sequence) calculated by Equation 1 below when analyzing SSA (Successive Self-nucleation and Annealing) is 1.25 to 1.40.

[Equation 1]

Inhomogeneity (I) = Lw / Ln

In the above formula 1,

L _w is the weighted average of the Ethylene Sequence Length (ESL), and L _n is the arithmetic mean of the Ethylene Sequence Length (ESL) (unit: nm).

The polyolefin of the present invention is a semi-crystalline polymer, and may include a crystalline portion and an amorphous portion. Specifically, the crystalline portion is formed in a bundle while the polymer chain including the ethylene repeating unit is folded, thereby forming a crystalline block (or segment) in the form of a lamellar. The ethylene repeating unit forming the lamellar crystal is an ethylene sequence.

The inventors of the present invention, when the heterogeneity (I) of 1.25 to 1.40 of the ethylene sequence calculated by Equation 1 above by SSA (Successive Self-nucleation and Annealing) analysis, compared with conventional polyolefins of the same density than It came to the present invention by focusing on having improved transparency and drop impact strength.

SSA (Successive Self-nucleation and Annealing) is a method of preserving crystals crystallized at each temperature by rapidly cooling at the end of each step while lowering the temperature step by step using a differential scanning calorimeter (DSC). to be.

That is, when the polyolefin is completely melted by heating, and then cooled to a specific temperature (T) and gradually annealed, the lamellas that are not stable at the temperature (T) are still melted and only the stable lamellas are melted. Crystallizes. At this time, the stability for the temperature (T) depends on the thickness of the lamella, and the thickness of the lamella depends on the chain structure. Therefore, by performing the heat treatment step by step, it is possible to quantitatively measure the lamellar thickness and its distribution according to the polymer chain structure, thereby measuring the distribution of each melting peak area.

According to one embodiment of the present invention, the SSA, using a differential scanning calorimeter, heats the polyolefin to 120 to 124°C at the first heating temperature, maintains it for 15 to 30 minutes, and then cools to 28 to 32°C. , n+1th heating temperature is 3 to 7℃ lower than the nth heating temperature, and the heating temperature is gradually lowered, and heating-annealing-quenching is performed until the final heating temperature is 50-54℃. It can be done by repeating.

More specifically, the SSA may be performed by the following steps i) to v):

i) heating the polyolefin to 160° C. using a differential scanning calorimeter and maintaining it for 30 minutes to remove all heat history before measurement;

ii) after lowering the temperature from 160°C to 122°C, maintaining for 20 minutes and lowering the temperature to 30°C for 1 minute;

iii) heating to 117° C., 5° C. lower than 122° C., maintaining it for 20 minutes, and lowering the temperature to 30° C. for 1 minute;

iv) The n+1th heating temperature is 5℃ lower than the nth heating temperature, and the heating rate, holding time, and cooling temperature are the same, gradually decreasing the heating temperature, and until the heating temperature becomes 52℃. Performing; And

v) Finally, raising the temperature from 30℃ to 160℃

The temperature profile of the SSA assay according to an embodiment of the present invention is shown in FIG. 2.

Referring to Figure 2, using a differential scanning calorimeter (device name: DSC8000, manufacturer: PerkinElmer) to initially heat the polyolefin to 160 ℃ and then maintained for 30 minutes to remove all the heat history before the measurement of the sample. After the temperature is lowered from 160°C to 122°C, the temperature is maintained for 20 minutes, the temperature is decreased to 30°C, and then maintained for 1 minute, and then the temperature is increased again.

Next, after heating to a temperature lower than the initial heating temperature of 122°C to 5°C (117°C), the temperature is maintained for 20 minutes, the temperature is reduced to 30°C for 1 minute, and then the temperature is increased again. In this way, the n+1th heating temperature is 5°C lower than the nth heating temperature, and the holding time and cooling temperature are the same, and the heating temperature is gradually lowered to 52°C. At this time, the temperature rise rate and the fall rate are respectively adjusted to 20°C/min. Lastly, in order to quantitatively analyze the distribution of crystals formed by repeating heating-annealing-quenching, the temperature is increased from 30°C to 160°C at a heating rate of 10°C/min. Measure.

As described above, when the heating-annealing-quenching of the polyolefin of the present invention is repeated by heating in an SSA manner, a temperature-specific peak appears, and accordingly, ethylene sequences of different thicknesses are obtained. From this, the weighted average of the ethylene sequences by the following equations 2 and 3 (weighted average, L _w ) and arithmetic mean (L _n ) can be obtained:

[Equation 2]

In the formula 2,

[Equation 3]

In the above formulas 2 and 3,

S _i is the area of each melting peak measured in the SSA thermogram,

L _i is ASL (Average Ethylene Sequence Length) corresponding to each melting peak in the SSA thermogram.

In addition, the ASL from the measured SSA thermogram Journal of Polymer Science Part B: Polymer Physics. 2002, vol. 40, 813-821, and Journal of the Korean Chemical Society 2011, Vol. 55, No. It can be calculated with reference to 4.

L _w and calculated in the same way as above The ratio of L _n (L _w / L _n ) is the heterogeneity of the ethylene sequence (inhomogeneity, I), which means that the larger the value of I, the lamella is distributed non-uniformly in the polymer chain.

The polyolefin according to an embodiment of the present invention may have a non-uniformity (I) of 1.25 or more, or 1.26 or more, or 1.27 or more, and 1.40 or less, or 1.38 or less, or 1.35 or less, or 1.32 or less.

The higher the non-uniformity, the better the drop impact strength, so the polyolefin of the present invention can exhibit improved transparency and drop impact strength than conventional polyolefins having the same range of density by having the above non-uniformity.

Low-density polyolefins can improve drop impact strength, but melt strength is lowered, making it difficult to produce stable blown films. However, according to the polyolefin of the present invention, compared to a conventional polyolefin product having the same density, it is possible to realize improved drop impact strength.

In addition, the polyolefin according to an embodiment of the invention meets the characteristics as described above, and also has a melt index (MI _2.16 ) measured at a temperature of 190° C. and a load of 2.16 kg according to ASTM D1238 standard from 0.5 to 1.5 g. It can be /10min. More specifically, the melt index (MI _2.16 ) is 0.5 g/10min or more, or 0.7 g/10min or more, or 0.8 g/10min or more, or 0.9 g/10min or more, and 1.5 g/10min or less, or 1.4 g/ It may be 10 min or less, or 1.3 g/10 min or less.

In addition, after the polyolefin film (BUR 2.3, film thickness 55 to 65 μm) was prepared using a film forming machine, the polyolefin according to the embodiment of the present invention had a haze of the film measured according to ISO 13468. 11% or less. More specifically, the haze of the polyolefin according to an embodiment of the present invention may be 11% or less, or 10.5% or less, or 10% or less. The lower the haze value is, the better, so the lower limit is not particularly limited, but may be, for example, 4% or more, or 5% or more, or 6% or more, or 7% or more.

In addition, the polyolefin according to an embodiment of the present invention, after preparing a polyolefin film (BUR 2.3, film thickness 55 to 65㎛) using a film forming machine, the drop impact strength measured according to ASTM D 1709 [Method A] May be 850 g or more, or 900 g or more, or 950 g or more. The higher the drop impact strength, the better, so the upper limit is not particularly limited, but may be, for example, 1,500 g or less, or 1,400 g or less, or 1,300 g or less, or 1,200 g or less.

In addition, the polyolefin according to an embodiment of the present invention may have a weight average molecular weight (Mw) of 70,000 to 140,000 g/mol. More preferably, the weight average molecular weight may be 80,000 g/mol or more, or 90,000 g/mol or more, and 130,000 g/mol or less, or 120,000 g/mol or less.

The weight average molecular weight (Mw) is measured by gel permeation chromatography (GPC), and means a universal calibration value using a polystyrene standard, and may be appropriately adjusted in consideration of the use or application field of the polyolefin.

On the other hand, the polyolefin according to an embodiment of the invention having the physical properties as described above may be prepared by a production method comprising the step of polymerizing an olefin monomer in the presence of a hybrid supported metallocene compound as a catalytically active component. .

More specifically, the polyolefin of the present invention is not limited thereto, and at least one first metallocene compound selected from compounds represented by Formula 1 below; At least one second metallocene compound selected from compounds represented by Formula 2 below; And a carrier supporting the first and second metallocene compounds, in the presence of a hybrid supported metallocene catalyst, and may be prepared by polymerizing an olefin monomer.

[Formula 1]

In Chemical Formula 1,

Q ₁ and Q ₂ are the same as or different from each other, and each independently halogen, C1 to C20 alkyl group, C2 to C20 alkenyl group, C2 to C20 alkoxyalkyl group, C6 to C20 aryl group, C7 to C20 alkylaryl Group or a C7 to C20 arylalkyl group;

T ₁ is carbon, silicon, or germanium;

M ₁ is a Group 4 transition metal;

X ₁ and X ₂ are the same as or different from each other, and each independently halogen, C1 to C20 alkyl group, C2 to C20 alkenyl group, C6 to C20 aryl group, nitro group, amido group, C1 to C20 alkylsilyl group , C1 to C20 alkoxy group, or C1 to C20 sulfonate group;

R ₁ to R ₁₄ are the same or different from each other, and each independently hydrogen, halogen, C1 to C20 alkyl group, C1 to C20 haloalkyl group, C2 to C20 alkenyl group, C1 to C20 alkylsilyl group, C1 to C20 Is a silylalkyl group, a C1 to C20 alkoxysilyl group, a C1 to C20 alkoxy group, a C6 to C20 aryl group, a C7 to C20 alkylaryl group, or a C7 to C20 arylalkyl group, or R ₁ to R ₁₄ Two or more adjacent to each other are connected to each other to form a substituted or unsubstituted aliphatic or aromatic ring;

[Formula 2]

In Chemical Formula 2,

Q ₃ and Q ₄ are the same or different from each other, and each independently halogen, C1 to C20 alkyl group, C2 to C20 alkenyl group, C2 to C20 alkoxyalkyl group, C6 to C20 aryl group, C7 to C20 alkylaryl Group or a C7 to C20 arylalkyl group;

T ₂ is carbon, silicon, or germanium;

M ₂ is a Group 4 transition metal;

X ₃ and X ₄ are the same as or different from each other, and each independently halogen, C1 to C20 alkyl group, C2 to C20 alkenyl group, C6 to C20 aryl group, nitro group, amido group, C1 to C20 alkylsilyl group , C1 to C20 alkoxy group, or C1 to C20 sulfonate group;

R ₁₅ to R ₂₈ are the same or different from each other, and each independently hydrogen, halogen, C1 to C20 alkyl group, C1 to C20 haloalkyl group, C2 to C20 alkenyl group, C2 to C20 alkoxyalkyl group, C1 to C20 An alkylsilyl group, a C1 to C20 silylalkyl group, a C1 to C20 alkoxysilyl group, a C1 to C20 alkoxy group, a C6 to C20 aryl group, a C7 to C20 alkylaryl group, or a C7 to C20 arylalkyl group, However, R ₂₀ and R ₂₄ are the same or different from each other, or each independently a C1 to C20 alkyl group, or two or more adjacent to each other among R ₁₅ to R ₂₈ are connected to each other to be substituted or unsubstituted aliphatic or aromatic rings. Is to form.

In the hybrid supported metallocene catalyst, the substituents of Chemical Formulas 1 and 2 are described in more detail as follows.

The C1 to C20 alkyl group includes a straight-chain or branched alkyl group, specifically methyl, ethyl, propyl, isopropyl, n-butyl, tert-butyl, pentyl, hexyl, heptyl, Octyl group and the like, but is not limited to this.

The C2 to C20 alkenyl group includes a straight or branched alkenyl group, and specifically, an allyl group, an ethenyl group, a propenyl group, a butenyl group, a pentenyl group, and the like, but is not limited thereto.

The C6 to C20 aryl group includes a monocyclic or condensed ring aryl group, and specifically, a phenyl group, a biphenyl group, a naphthyl group, a phenanthrenyl group, a fluorenyl group, and the like, but are not limited thereto.

Examples of the alkoxy group of C1 to C20 include a methoxy group, an ethoxy group, a phenyloxy group, and a cyclohexyloxy group, but are not limited thereto.

The C2 to C20 alkoxyalkyl group is a functional group in which one or more hydrogens of the alkyl group as described above are substituted with an alkoxy group, specifically, methoxymethyl group, methoxyethyl group, ethoxymethyl group, iso-propoxymethyl group, iso-propoxy Alkoxyalkyl groups such as ethyl group, iso-propoxyhexyl group, tert-butoxymethyl group, tert-butoxyethyl group, and tert-butoxyhexyl group; Or an aryloxyalkyl group such as a phenoxyhexyl group, but is not limited thereto.

The alkylsilyl group of C1 to C20 or the alkoxysilyl group of C1 to C20 is a functional group in which 1-3 hydrogens of -SiH ₃ are substituted with 1 to 3 alkyl groups or alkoxy groups as described above, specifically methylsilyl group, die Alkyl silyl groups such as methyl silyl group, trimethyl silyl group, dimethyl ethyl silyl group, diethyl methyl silyl group or dimethylpropyl silyl group; Alkoxysilyl groups such as methoxysilyl group, dimethoxysilyl group, trimethoxysilyl group or dimethoxyethoxysilyl group; Alkoxyalkylsilyl groups such as methoxydimethylsilyl group, diethoxymethylsilyl group, or dimethoxypropylsilyl group, but are not limited thereto.

The silylalkyl group of C1 to C20 is a functional group in which at least one hydrogen of the alkyl group is substituted with a silyl group, specifically, -CH ₂ -SiH ₃ , methylsilylmethyl group or dimethylethoxysilylpropyl group, and the like. , It is not limited to this.

The halogen may be fluorine (F), chlorine (Cl), bromine (Br) or iodine (I).

The sulfonate groups ^'R by the structure of ^the' -O-SO ₂ -R may be an alkyl group of C1 to C20. Specifically, a C1 to C20 sulfonate group may include a methanesulfonate group or a phenylsulfonate group, but is not limited thereto.

In addition, in the present specification, two substituents adjacent to each other are connected to each other to form an aliphatic or aromatic ring. The atom(s) of the two substituents and the valence (atoms) of the two substituents are connected to each other to form a ring. Means Concrete or the like to, -NR _a R _b or -NR _{a 'R b'} of the R _a and R _b or R _{a 'and} R _b' are connected to each other for example by forming the aliphatic ring is piperidinyl (piperidinyl) group Examples that may be mentioned, -NR _a R _b or -NR _{a 'R b'} of the R _a and R _b or R _{a 'and} R _b' which are connected to each other to form an aromatic ring such as pyrrolyl (pyrrolyl) group Can be illustrated.

The above-mentioned substituents are optionally hydroxyl groups within the range of exerting the same or similar effect as the desired effect; halogen; Alkyl group or alkenyl group, aryl group, alkoxy group; An alkyl group or an alkenyl group, an aryl group, or an alkoxy group containing at least one hetero atom from the hetero atoms of groups 14 to 16; Silyl group; Alkyl silyl groups or alkoxy silyl groups; Phosphine group; Phosphide group; Sulfonate groups; And it may be substituted with one or more substituents selected from the group consisting of sulfone groups.

Examples of the Group 4 transition metal include titanium (Ti), zirconium (Zr), and hafnium (Hf), but are not limited thereto.

When the hybrid supported catalyst is used, transparency of the polyolefin is maintained and excellent drop impact strength due to non-uniformity of the lamellar distribution can be secured, thereby making polyolefin excellent in high processability, particularly melt blown workability.

Specifically, in the hybrid supported catalyst according to an embodiment of the present invention, the first metallocene compound includes a long chain branch and is easy to produce a low molecular weight polyolefin, and the second metallocene compound is the first metal Compared to the rosene compound, it contains a small amount of long-chain branches and is easy to produce polyolefins of relatively high molecular weight. In particular, there are many long-chain branches in the polymer, and the melt strength increases when the molecular weight is large. In the case of the first metallocene compound, there are limitations in improving bubble stability due to low molecular weight compared to many long-chain branches.

In the present invention, excellent transparency is obtained by hybridly supporting a first metallocene compound that contains a relatively long chain branch and produces a polymer having a low molecular weight, and a second metallocene compound that produces a relatively high molecular weight polymer with a relatively short chain branch. The melt strength was improved while maintaining the. By supporting the two metallocene compounds in a hybrid manner, the long-chain branching present in the polymer is located on the relatively low molecular weight side, so that transparency is not deteriorated.

In particular, the hybrid supported catalyst of the present invention is characterized in that the long chain branch produced by the first metallocene compound of Formula 1 and the long chain branch produced by the second metallocene compound of Formula 2 are entangled at the molecular level. Have The melt strength is enhanced because a large force is required to dissolve in the molten state by entanglement between long chain branches. When melt blending was performed by melting the homopolymer by each catalyst, it was found that the improvement in melt strength did not appear, and thus it was found that the improvement in melt strength is effective when entanglement occurs from the polymerization step by the hybrid supported catalyst.

More specifically, in the hybrid supported catalyst according to an embodiment of the present invention, the first metallocene compound represented by Chemical Formula 1 is a different ligand, and the metallocene compound is a cyclopentadienyl ligand and tetrahydroindenyl It includes a ligand, and the ligands are cross-linked by -Si(Q ₁ )(Q ₂ )-, and have a structure in which M ₁ (X ₁ )(X ₂ ) exists between the ligands. Polymerization of a catalyst having such a structure can obtain a polymer having a small amount of long-chain branching, and having a relatively narrow molecular weight distribution (PDI, MWD, Mw/Mn) and a melt flow index (MFRR).

Specifically, the cyclopentadienyl ligand in the structure of the metallocene compound represented by Chemical Formula 1 may affect, for example, olefin polymerization activity.

Particularly, each of R ₁₁ to R ₁₄ of the cyclopentadienyl ligand is independently a C1 to C20 alkyl group, a C1 to C20 alkoxy group, or a C2 to C20 alkenyl group. The catalyst obtained from the compound may exhibit higher activity in the olefin polymerization process, and when R ₁₁ to R ₁₄ are each independently one of a methyl group, an ethyl group, a propyl group and a butyl group, the hybrid supported catalyst polymerizes the olefin monomer It can exhibit very high activity in the process.

In addition, in the structure of the metallocene compound represented by Chemical Formula 1, the tetrahydroindenyl ligand structure has a non-covalent electron pair capable of acting as a Lewis base, thereby exhibiting stable, high polymerization activity, and also the tetrahydro. The nil ligand, for example, can easily control the molecular weight of the polyolefin produced by controlling the degree of steric hindrance effect according to the type of the substituted functional group.

Specifically, in Formula 1, R ₁ may be any one of hydrogen, a C1 to C20 alkyl group, a C1 to C20 alkoxy group, and a C2 to C20 alkenyl group. More specifically, in Formula 1, R ₁ is hydrogen or an alkyl group of C1 to C20, and R ₂ to R ₁₀ may each be hydrogen. In this case, the hybrid supported catalyst may provide polyolefin having excellent processability.

In addition, within the structure of the metallocene compound represented by Chemical Formula 1, the cyclopentadienyl ligand and the tetrahydroindenyl ligand are crosslinked by -Si(Q ₁ )(Q ₂ )- to exhibit excellent stability. have. Q ₁ and Q ₂ may each independently be a C1 to C20 alkyl group or a C6 to C20 aryl group to effectively secure this effect. More specifically, the metallocene compound wherein Q ₁ and Q ₂ are each independently one of a methyl group, ethyl group, n-propyl group, iso-propyl group, n-butyl group, t-butyl group, phenyl group, and benzyl group. Can be used.

M ₁ (X ₁ )(X ₂ ) present between the cyclopentadienyl ligand and the tetrahydroindenyl ligand in the structure of the metallocene compound represented by Chemical Formula 1 affects storage stability of the metal complex. Can go crazy. X ₁ and X ₂ may be each independently halogen, an alkyl group of C1 to C20, and an alkoxy group of C1 to C20, in order to effectively secure this effect. More specifically, X ₁ and X ₂ may each independently be F, Cl, Br or I, and M ₁ is Ti, Zr or Hf; Zr or Hf; Or Zr.

As one example, as a first metallocene compound capable of providing a polyolefin having increased drop impact strength and a large amount of short-chain branching and having excellent blown film processability, the metallocene compound of Formula 1 is It may be a compound represented by, but is not limited thereto.

,

,

,

,

,

,

,

,

,

,

,

,

,

,

The first metallocene compound represented by Chemical Formula 1 may be synthesized by applying known reactions. Specifically, a tetrahydroindenyl derivative and a cyclopentadiene derivative may be prepared by connecting a bridge compound to prepare a ligand compound, and then adding a metal precursor compound to perform metallation, but is not limited thereto. , For detailed synthesis methods, refer to Examples.

Meanwhile, in the hybrid supported catalyst according to an embodiment of the present invention, the metallocene compound represented by Chemical Formula 2 has a cyclopentadienyl ligand and a substituent (R ₂₀ and R ₂₄ ) at a specific position as different ligands. Indenyl ligand, the different ligands are cross-linked by -Si(Q ₃ )(Q ₄ )-, and a structure in which M ₂ (X ₃ )(X ₄ ) exists between the different ligands Have When the metallocene compound having such a specific structure is activated by an appropriate method and used as a catalyst in the polymerization reaction of the olefin, long chain branching can be generated. As described above, by introducing substituents (R ₂₀ and R ₂₄ ) at specific positions of the indene derivative of Formula 2, the polymerization activity is higher than that of unsubstituted indene compounds or metallocene compounds containing indene compounds substituted at other positions. It can have a high characteristic.

In particular, the second metallocene compound represented by Chemical Formula 2 has a molecular weight of about 150,000 to 550,000 when polymerized alone, and has SCB, so it has a narrow molecular weight distribution when applied to a hybrid catalyst and has processability. There are characteristics that can be improved.

Specifically, the cyclopentadienyl ligand in the structure of the metallocene compound represented by Chemical Formula 2 may, for example, affect olefin polymerization activity.

Particularly, R ₂₅ to R ₂₈ of the cyclopentadienyl ligand are each independently hydrogen, a C1 to C20 alkyl group, a C2 to C20 alkoxyalkyl group, or a C6 to C20 aryl group, respectively. The catalyst obtained from the metallocene compound may exhibit higher activity in the olefin polymerization process, R ₂₅ and R ₂₈ are each hydrogen, and R ₂₆ and R ₂₇ are each independently hydrogen, an alkyl group of C1 to C20, or C2 to In the case of a C20 alkoxyalkyl group, the hybrid supported catalyst may exhibit very high activity in the polymerization process of olefin monomers.

In addition, the indenyl ligand in the structure of the metallocene compound represented by Chemical Formula 2, for example, can easily control the molecular weight of the polyolefin produced by controlling the degree of steric hindrance effect according to the type of the substituted functional group. have.

Specifically, a phenyl group is substituted at position 4 of the indenyl group, and R ₂₀ serving as a para position of the phenyl group may be a C1 to C20 alkyl group, and also a substituent R ₂₄ at position 6 of the indenyl group may also be C1 It is preferable from the viewpoint of raising the molecular weight to have an alkyl group of C20 to C20. In particular, R ₂₀ and R ₂₄ may each independently be a C1 to C4 alkyl group, R ₂₀ may preferably be a methyl group, an ethyl group, an n-propyl group, an iso-propyl group, etc., and R ₂₄ is preferably Can be a t-butyl group. In this case, the hybrid supported catalyst may provide polyolefin having excellent copolymerizability.

The remaining substituents R ₁₅ to R ₁₉ and R ₂₁ to R ₂₃ of the indenyl group are each independently hydrogen, halogen, C1 to C20 alkyl group, C1 to C20 haloalkyl group, C2 to C20 alkenyl group, C2 to C20 alkoxy Alkyl group, C1 to C20 alkylsilyl group, C1 to C20 silylalkyl group, C1 to C20 alkoxysilyl group, C1 to C20 alkoxy group, C6 to C20 aryl group, C7 to C20 alkylaryl group, or C7 to C20 may be an arylalkyl group.

In addition, within the structure of the metallocene compound represented by Chemical Formula 2, the cyclopentadienyl ligand and the indenyl ligand may be crosslinked by -Si(Q ₃ )(Q ₄ )- to exhibit excellent stability. In order to more effectively secure this effect, Q ₃ and Q _{4 may} each independently be a C1 to C20 alkyl group or a C2 to C20 alkoxyalkyl group. More specifically, Q ₃ and Q ₄ are each independently a methyl group, ethyl group, n-propyl group, iso-propyl group, n-butyl group, t-butyl group, methoxymethyl group, methoxyethyl group, ethoxymethyl group, iso A metallocene compound of any one of -propoxymethyl group, iso-propoxyethyl group, iso-propoxyhexyl group, tert-butoxymethyl group, tert-butoxyethyl group, and tert-butoxyhexyl group can be used.

In particular, the metallocene compound represented by Chemical Formula 2 may be a C2 to C20 alkoxyalkyl group in which any one or more of a cyclopentadiene (Cp) substituent or a -Si(Q ₃ )(Q ₄ )-silyl group may be used. , iso-propoxyethyl group, iso-propoxyhexyl group, tert-butoxyethyl group, tert-butoxyhexyl group and the like are more preferable.

This may affect the copolymerization of the C2 to C20 alkoxyalkyl group of an alpha olefin comonomer such as 1-butene or 1-hexene, wherein the alkoxyalkyl group is C4 or less. This is because, in the case of having a short alkyl group chain, while maintaining the overall polymerization activity, copolymerization with respect to the alpha olefin comonomer is lowered, so that a polyolefin having a controlled copolymerization degree can be produced without deteriorating other physical properties.

In addition, in the structure of the metallocene compound represented by Chemical Formula 2, M ₂ (X ₃ )(X ₄ ) present between the cyclopentadienyl ligand and the tetrahydroindenyl ligand is dependent on storage stability of the metal complex. It can affect. X ₃ and X ₄ may each independently be halogen, an alkyl group of C1 to C20, or an alkoxy group of C1 to C20, in order to effectively secure this effect. More specifically, X ₃ and X ₄ may each independently be F, Cl, Br or I, and M ₂ is Ti, Zr or Hf; Zr or Hf; Or Zr.

Meanwhile, as a specific example of the second metallocene compound represented by Chemical Formula 2, a compound represented by the following structural formulas may be mentioned, but the present invention is not limited thereto.

,

,

,

,

,

,

As such, the hybrid supported metallocene catalyst of the above embodiment may include the first and second metallocene compounds to produce polyolefin having excellent processability as well as excellent physical properties, particularly drop impact strength.

In particular, the mixing molar ratio of the first metallocene compound and the second metallocene compound is about 1:1 to 10:1, preferably about 1.2:1 to 7.5:1, more preferably 1.5: 1 to 7.0:1 or 1.8:1 to 6.5:1. The mixed molar ratio of the first metallocene compound and the second metallocene compound may be 1:1 or higher in terms of physical property control in order to satisfy both physical properties and processability by controlling the molecular weight and the amount of SCB and LCB, In terms of securing processability, it may be 10:1 or less.

Meanwhile, the first and second metallocene compounds have the above-described structural characteristics and can be stably supported on a carrier.

As the carrier, a carrier containing a hydroxy group or a siloxane group on the surface may be used. Specifically, as the carrier, a carrier containing a hydroxy group or a siloxane group having high reactivity may be used by drying at a high temperature to remove moisture on the surface. More specifically, silica, alumina, magnesia or mixtures thereof may be used as the carrier, and silica may be more preferable. The carrier may be dried at high temperature, for example, silica dried at high temperature, silica-alumina, and silica-magnesia may be used, and these are typically Na ₂ O, K ₂ CO ₃ , BaSO ₄ and Mg( NO ₃ ) ₂ and the like, and may include oxide, carbonate, sulfate, and nitrate components.

The drying temperature of the carrier is preferably about 200 to 800°C, more preferably about 300 to 600°C, and most preferably about 300 to 400°C. When the drying temperature of the carrier is less than about 200 °C, there is too much moisture so that the surface moisture and the co-catalyst react, and when it exceeds about 800 °C, the surface area decreases as the pores of the carrier surface are combined and the surface is hydroxy. It is not preferable because many groups disappear and only siloxane groups remain, thereby reducing the reaction site with the cocatalyst.

The amount of hydroxyl groups on the surface of the carrier is preferably about 0.1 to 10 mmol/g, and more preferably about 0.5 to 5 mmol/g. The amount of hydroxy groups on the surface of the carrier can be controlled by the method and conditions for preparing the carrier or drying conditions, such as temperature, time, vacuum or spray drying.

If the amount of the hydroxy group is less than about 0.1 mmol/g, there are fewer reaction sites with the co-catalyst, and if it exceeds about 10 mmol/g, it may be due to moisture other than the hydroxy group present on the surface of the carrier particle. It is not desirable.

In addition, in the hybrid supported metallocene catalyst of the above embodiment, as a co-catalyst supported on a carrier for activating the metallocene compound, an organometallic compound containing a Group 13 metal, under a general metallocene catalyst It is not particularly limited as long as it can be used when polymerizing the olefin.

Specifically, the co-catalyst compound may include at least one of the aluminum-containing first co-catalyst of Formula 3 and the borate-based second co-catalyst of Formula 4 below.

[Formula 3]

R _a -[Al(R _b )-O] _n -R _c

In Chemical Formula 3,

R _a , R _b , and R _c are the same as or different from each other, and each independently hydrogen, halogen, a C1 to C20 hydrocarbyl group, or a C1 to C20 hydrocarbyl group substituted with halogen;

n is an integer of 2 or more;

[Formula 4]

T ⁺ [BG ₄ ] ^-

In the formula (4), T ⁺ is a + monovalent polyatomic ion, B is a +3 oxidized boron, and G is each independently a hydride group, dialkylamido group, halide group, alkoxide group, aryl oxide group, hydro It is selected from the group consisting of carbyl groups, halocarbyl groups and halo-substituted hydrocarbyl groups, wherein G has 20 or fewer carbons, but at only one or less positions, G is a halide group.

The first cocatalyst of Chemical Formula 3 may be a linear, circular or reticulated alkyl aluminoxane-based compound in which repeating units are combined, and specific examples of the first cocatalyst are methyl aluminoxane (MAO) and ethyl aluminium. And oxalic acid, isobutyl aluminoxane or butyl aluminoxane.

In addition, the second cocatalyst of Chemical Formula 4 may be a borate-based compound in the form of a trisubstituted ammonium salt, or a dialkyl ammonium salt, a trisubstituted phosphonium salt. Specific examples of such a second cocatalyst include trimetalammonium tetraphenylborate, methyldioctadecylammonium tetraphenylborate, triethylammonium tetraphenylborate, tripropylammonium tetraphenylborate, and tri(n-butyl)ammonium tetraphenylborate , Methyltetradecyclooctadecylammonium tetraphenylborate, N,N-dimethylaninium tetraphenylborate, N,N-diethylaninium tetraphenylborate, N,N-dimethyl(2,4,6-trimethylaninium )Tetraphenylborate, trimethylammonium tetrakis(pentafloorophenyl)borate, methylditetradecylammonium tetrakis(pentaphenyl)borate, methyldioctadecylammonium tetrakis(pentafluorophenyl)borate, triethylammonium, tetra Keith (pentafluorophenyl) borate, tripropylammonium tetrakis (pentafluorofluorophenyl) borate, tri(n-butyl)ammonium tetrakis (pentafluorophenyl) borate, tri(secondary-butyl)ammonium tetrakis (Pentafluorophenyl) borate, N,N-dimethylaninium tetrakis(pentafluorophenyl) borate, N,N-diethylaninium tetrakis(pentafluorophenyl) borate, N,N-dimethyl (2 ,4,6-trimethylaninium)tetrakis(pentafluorophenyl)borate, trimethylammoniumtetrakis(2,3,4,6-tetrafluorophenyl)borate, triethylammonium tetrakis(2,3,4 ,6-tetrafluorophenyl)borate, tripropylammonium tetrakis(2,3,4,6-tetrafluorophenyl)borate, tri(n-butyl)ammonium tetrakis(2,3,4,6-, Tetrafluorophenyl)borate, dimethyl(t-butyl)ammonium tetrakis(2,3,4,6-tetrafluorophenyl)borate, N,N-dimethylaninium tetrakis(2,3,4,6- Tetrafluorophenyl)borate, N,N-diethylaninium tetrakis(2,3,4,6-tetrafluorophenyl)borate or N,N-dimethyl-(2,4,6-trimethylaninium) A borate-based compound in the form of a trisubstituted ammonium salt such as tetrakis-(2,3,4,6-tetrafluorophenyl)borate; Borate systems in the form of dialkylammonium salts such as dioctadecylammonium tetrakis(pentafluorophenyl)borate, ditetradecylammonium tetrakis(pentafluorophenyl)borate or dicyclohexylammonium tetrakis(pentafluorophenyl)borate compound; Or triphenylphosphonium tetrakis(pentafluorophenyl)borate, methyldioctadecylphosphonium tetrakis(pentafluorophenyl)borate or tri(2,6-, dimethylphenyl)phosphonium tetrakis(pentafluorophenyl) And a borate-based compound in the form of a trisubstituted phosphonium salt such as borate.

In the hybrid supported metallocene catalyst of the above embodiment, the mass ratio of the total transition metal to the carrier included in the first metallocene compound and the second metallocene compound may be 1:10 to 1:1000. When the carrier and the metallocene compound are included in the mass ratio, an optimal shape may be exhibited.

In addition, the mass ratio of the co-catalyst compound to the carrier may be 1:1 to 1:100. When the cocatalyst and carrier are included in the mass ratio, the active and polymer microstructures can be optimized.

The hybrid supported metallocene catalyst of the above embodiment can be used for polymerization of an olefinic monomer as such. In addition, the hybrid supported metallocene catalyst may be prepared by using a prepolymerized catalyst in contact with an olefinic monomer, for example, an olefin such as ethylene, propylene, 1-butene, 1-hexene, 1-octene, or the like. It can also be prepared and used as a prepolymerized catalyst by contacting with a monomer.

On the other hand, the hybrid supported metallocene catalyst of the one embodiment, the step of supporting a co-catalyst on a carrier; Supporting the first and second metallocene compounds on a carrier on which the cocatalyst is supported; It can be produced by a manufacturing method comprising a.

At this time, the first and second metallocene compounds may be sequentially supported one by one, or two may be supported together. At this time, although there is no limitation in the order of loading, the shape of the hybrid supported metallocene catalyst can be improved by first supporting the second metallocene catalyst having a relatively poor morphology, and accordingly, the second metal After supporting the sen catalyst, the first metallocene catalyst may be supported in order.

In the above method, the loading conditions are not particularly limited and may be performed within a range well known to those skilled in the art. For example, the high-temperature loading and low-temperature loading can be appropriately performed, and for example, the loading temperature is possible in a range of about -30°C to 150°C, preferably room temperature (about 25°C) to about 100°C. , More preferably from room temperature to about 80°C. The loading time can be appropriately adjusted according to the amount of the metallocene compound to be loaded. The supported catalyst that is reacted can be used as it is by filtering or distilling the reaction solvent under reduced pressure. If necessary, it can be used by soxhlet filtering with an aromatic hydrocarbon such as toluene.

And, the production of the supported catalyst can be carried out in a solvent or solvent-free. When a solvent is used, the usable solvent is an aliphatic hydrocarbon solvent such as hexane or pentane, an aromatic hydrocarbon solvent such as toluene or benzene, a hydrocarbon solvent substituted with a chlorine atom such as dichloromethane, ether based such as diethyl ether or THF Most organic solvents, such as a solvent, acetone, and ethyl acetate, are mentioned, and hexane, heptane, toluene, or dichloromethane is preferable.

On the other hand, according to another embodiment of the invention, in the presence of the hybrid supported metallocene catalyst, a method for producing a polyolefin including the step of polymerizing an olefin monomer may be provided.

And, the olefin monomer is ethylene, propylene, 1-butene, 1-pentene, 4-methyl-1-pentene, 1-hexene, 1-heptene, 1-octene, 1-decene, 1-undecene, 1-dode Sen, 1-tetradecene, 1-hexadecene, 1-eicocene, norbornene, norbornadiene, ethylidene novoden, phenyl novoden, vinyl novoden, dicyclopentadiene, 1,4-butadiene, 1, It may be at least one selected from the group consisting of 5-pentadiene, 1,6-hexadiene, styrene, alpha-methylstyrene, divinylbenzene and 3-chloromethylstyrene.

For the polymerization reaction of the olefin monomer, various polymerization processes known as polymerization reactions of olefin monomers, such as a continuous solution polymerization process, a bulk polymerization process, a suspension polymerization process, a slurry polymerization process, or an emulsion polymerization process, may be employed. This polymerization reaction can be carried out under a temperature of about 25 to 500 °C, or about 25 to 200 °C, or about 50 to 150 °C, and a pressure of about 1 to 100 bar or about 10 to 80 bar.

In addition, in the polymerization reaction, the hybrid supported metallocene catalyst may be used in a dissolved or diluted state in a solvent such as pentane, hexane, heptane, nonane, decane, toluene, benzene, dichloromethane, chlorobenzene, and the like. At this time, by treating the solvent with a small amount of alkyl aluminum or the like, a small amount of water or air, which may adversely affect the catalyst, can be removed in advance.

In addition, the polyolefin produced by the above method may exhibit high drop impact strength with low density and excellent transparency.

Specifically, the polyolefin has a density of 0.915 g/cm ³ to 0.930 g/cm ³ And, in the case of SSA (Successive Self-nucleation and Annealing) analysis, the ethylene sequence (inhomogeneity, I) may be 1.25 to 1.40.

In addition, the polyolefin may have a melt index (MI _2.16 ) measured at a temperature of 190° C. and a load of 2.16 kg according to the ASTM D1238 standard from 0.5 to 1.5 g/10min.

In addition, the polyolefin may be a polyolefin film (BUR 2.3, film thickness of 55 to 65 μm) prepared by using a film forming machine, and the haze of the film measured according to ISO 13468 may be 11% or less.

In addition, the polyolefin may be a polyolefin film (BUR 2.3, film thickness 55 to 65 μm) prepared by using a film forming machine, and the drop impact strength measured according to ASTM D 1709 [Method A] may be 850 g or more.

In addition, when the above-mentioned polyolefin is, for example, an ethylene-alpha olefin copolymer, preferably a copolymer of ethylene and 1-butene or an ethylene-1-hexene copolymer, the above physical properties can be more appropriately satisfied. .

Hereinafter, preferred embodiments are provided to help understanding of the present invention. However, the following examples are provided only for easier understanding of the present invention, and the contents of the present invention are not limited thereby.

<Example>

<Synthesis Example of Metallocene Compound>

Synthesis Example 1: First metallocene compound

Preparation of 1-1 ligand compound

Tetramethylcyclopentadiene (TMCP) was used as a tetramethylcyclopentyl-Li salt (TMCP-Li salts) by filtering after THthi (0.4 M) Lithiation with n-BuLi (1 equivalent). Indene (Indene) was Lithiation with Hexane (0.5 M) n-BuLi (1 equivalent) and filtered to be used as Inden-Li salts. In a 250 mL Schlenk flask, 50 mmol of tetramethylcyclopentyl-Li salts (TMCP-Li salts) under Ar and about 100 mL of tetrahydrofuran (THF) were added. One equivalent of dichloromethyl-(iso-propyl) silane was added at -20 °C. After about 6 hours, 3 mol% of CuCN and Ind-Li salts (50 mmol, MTBE 1M solution) were added at -20°C and reacted for about 12 hours. The organic layer was separated with water and Hexane to obtain a ligand.

Preparation of 1-2 metallocene compound

50 mmol of the ligand compound synthesized in 1-1 was added to a dried 250 mL Schlenk flask, dissolved in 100 mL of MTBE under Ar, and 2 equivalents of n-BuLi was added dropwise at -20°C. After the reaction for about 16 hours, a ligand-Li solution was added to ZrCl ₄ (THF) ₂ (50 mmol, MTBE 1 M solution). After the reaction for about 16 hours, the solvent was removed, and LiCl was removed by filtering with methylene chloride (MC). The solvent of the filtrate was removed, about 50 mL of MTBE and about 100 mL of Hexane were added, stirred for about 2 hours, and filtered to obtain a solid metallocene catalyst precursor.

The metallocene catalyst precursor (20 mmol) obtained above, DCM 60 mL, and Pd/C catalyst 5 mol% were added to a high pressure stainless steel (sus) reactor under an argon atmosphere. The argon inside the high pressure reactor was replaced with hydrogen three times, and hydrogen was charged so that the pressure was about 20 bar. The reaction was completed by stirring at 35° C. for 24 hours. After replacing the inside with argon, DCM solution was transferred to a schlenk flask under an argon atmosphere. This solution was passed through celite under argon to remove the Pd/C catalyst and the solvent was dried to obtain a solid catalyst precursor.

¹ H NMR (500 MHz, C6D6): 0.62 (3H, s), 0.98 (3H, d), 1.02 (3H, d), 1.16 (2H, dd), 1.32-1.39 (3H, m), 1.78 (3H , s), 1.81 (3H, s), 1.84-1.94 (3H, m), 2.01 (3H, s), 2.03 (1H, m), 2.04 (3H, s), 2.35 (2H, m), 2.49- 2.55 (1H, m), 3.13-3.19 (1H, m), 5.27 (1H, d), 6.75 (1H, d).

Synthesis Example 2: First metallocene compound

Preparation of 2-1 ligand compound

Tetramethylcyclopentadiene (TMCP) was used as a tetramethylcyclopentyl-Li salt (TMCP-Li salts) after filtering with TH-(0.4 M) Lithiation in n-BuLi (1 equivalent). Indene (Indene) was Lithiation with Hexane (0.5 M) n-BuLi (1 equivalent) and filtered to be used as Inden-Li salts. In a 250 mL Schlenk flask, 50 mmol of tetramethylcyclopentyl-Li salts (TMCP-Li salts) under Ar and 100 mL of tetrahydrofuran (THF) were added. One equivalent of dichloromethylphenyl silane was added at -20 °C. After about 6 hours, 3 mol% of CuCN and Ind-Li salts (50 mmol, MTBE 1M solution) were added at -20°C and reacted for about 12 hours. The organic layer was separated with water and Hexane to obtain a ligand.

2-2 Preparation of metallocene compound

In a dried 250 mL Schlenk flask, 50 mmol of the ligand compound synthesized in 2-1 was added, dissolved in about 100 mL of MTBE under Ar, and 2 equivalents of n-BuLi was added dropwise at -20°C. After the reaction for about 16 hours, a ligand-Li solution was added to ZrCl ₄ (THF) ₂ (50 mmol, MTBE 1 M solution). After the reaction for about 16 hours, the solvent was removed, and LiCl was removed by filtering with methylene chloride (MC). The solvent of the filtrate was removed, about 50 mL of MTBE and about 100 mL of Hexane were added, stirred for about 2 hours, and filtered to obtain a solid metallocene catalyst precursor.

The metallocene catalyst precursor (20 mmol) obtained above, DCM 60 mL, and Pd/C catalyst 5 mol% were added to a high pressure stainless steel (sus) reactor under an argon atmosphere. The argon inside the high pressure reactor was replaced with hydrogen three times, and hydrogen was charged so that the pressure was about 20 bar. The reaction was completed by stirring at about 35° C. for about 24 hours. After replacing the inside with argon, DCM solution was transferred to a schlenk flask under an argon atmosphere. This solution was passed through celite under argon to remove the Pd/C catalyst and the solvent was dried to secure metallocene compounds (A, B form) having different stereoisomers in a ratio of 1.3:1.

¹ H NMR (500 MHz, CDCl ₃ ):

Form A: 0.88 (3H, s), 1.43-1.50 (1H, m), 1.52-1.57 (1H, m), 1.60 (3H, s), 1.62-1.68 (1H, m), 1.87-1.95 (1H, m), 1.95-2.00 (1H, m), 2.00 (3H, s), 2.06 (3H, s), 2.08 (3H, s), 2.41-2.47 (1H, m), 2.72-2.78 (1H, m) , 3.04-3.10 (1H, m), 5.62 (1H, d), 6.73 (1H, d), 7.49 (3H, m), 7.87 (2H, m)

Form B: 0.99 (3H, s), 1.42 (3H, s), 1.60-1.67 (2H, m), 1.90-1.98 (1H, m), 1.95 (3H, s), 2.06 (3H, s), 2.06 -2.10 (1H, m), 2.11 (3H, s), 2.44-2.49 (1H, m), 2.66-2.70 (1H, m), 2.74-2.79 (1H, m), 3.02-3.11 (1H, m) , 5.53 (1H, d), 6.74 (1H, d), 7.48 (3H, m), 7.88 (2H, m).

Synthesis Example 3: First metallocene compound

Preparation of 3-1 ligand compound

After dissolving tetramethylcyclopentadiene (TMCP, 6.0 mL, 40 mmol) in THF (60 mL) in a dried 250 mL schlenk flask, the solution was cooled to -78 °C. Subsequently, n-BuLi (2.5M, 17mL, 42mmol) was slowly added dropwise to the solution, and the resulting solution was stirred overnight at room temperature.

Meanwhile, after dichlorodimethylsilane (4.8 mL, 40 mmol) was dissolved in n-hexane in a separate 250 mL schlenk flask, the solution was cooled to -78 °C. Subsequently, the TMCP-lithiation solution prepared prior to this solution was slowly injected. And the resulting solution was stirred overnight at room temperature.

Thereafter, the resulting solution was depressurized to remove the solvent from the solution. Then, the obtained solid was dissolved in toluene, and filtered to remove the remaining LiCl to obtain an intermediate (yellow liquid, 7.0 g, 33 mmol, 83% yield).

¹ H NMR (500 MHz, CDCl ₃ ): 0.24 (6H, s), 1.82 (6H, s), 1.98 (6H, s), 3.08 (1H, s).

After dissolving indene (0.93 mL, 8.0 mmol) in THF (30 mL) in a dried 250 mL schlenk flask, the solution was cooled to -78 °C. Subsequently, n-BuLi (2.5M, 3.4 mL, 8.4 mmol) was slowly added dropwise to the solution, and the resulting solution was stirred at room temperature for about 5 hours.

On the other hand, the intermediate (1.7 g, 8.0 mmol) previously synthesized in a separate 250 mL schlenk flask was dissolved in THF, and the solution was cooled to -78 °C. Subsequently, the indene-lithiation solution prepared before this solution was slowly injected. And the resulting solution was stirred overnight at room temperature to obtain a purple solution.

Then, water was poured into the reactor to terminate the reaction (quenching), and the organic layer was extracted with ether from the mixture. It was confirmed by ¹ H NMR that the organic layer contained dimethyl (indenyl) (tetramethylcyclopentadienyl) silane and organic compounds of other species. The organic layer was concentrated without purification and used as it is for metallation.

3-2 Preparation of metallocene compound

Dimethyl (indenyl) (tetramethylcyclopentadienyl) silane (1.7 g, 5.7 mmol) synthesized in 250 mL schlenk flask was dissolved in toluene (30 mL) and MTBE (3.0 mL). Then, after cooling this solution to -78°C, n-BuLi (2.5M, 4.8mL, 12mmol) was slowly added dropwise to the solution, and the resulting solution was stirred overnight at room temperature. However, a yellow solid was formed in the solution and was not uniformly stirred, so MTBE (50 mL) and THF (38 mL) were additionally added.

Meanwhile, after dispersing ZrCl ₄ (THF) ₂ in toluene in a 250 mL schlenk flask separately prepared, the resulting mixture was cooled to -78°C. Subsequently, the lithiated ligand solution prepared before the mixture was slowly injected. Then, the resulting mixture was stirred overnight.

Then, the reaction product was filtered to obtain a yellow solid (1.3 g, containing LiCl (0.48 g), 1.8 mmol), and after removing the solvent from the filtrate, washing with n-hexane to further add a yellow solid (320 mg, 0.70 mmol). Obtained (total 44% yield).

¹ H NMR (500 MHz, CDCl ₃ ): 0.96 (3H, s), 1.16 (3H, s), 1.91 (3H, s), 1.93 (3H, s), 1.96 (3H, s), 1.97 (3H, s), 5.98 (1H, d), 7.07 (1H, t), 7.23 (1H, d), 7.35 (1H, t), 7.49 (1H, d), 7.70 (1H, d).

The previously synthesized dimethylsilylene (tetramethylcyclopentadienyl) (indenyl) zirconium dichloride (1.049 g, 2.3 mmol) was placed in a mini bombe in a glove box. Then, the platinum bomb (52.4mg, 0.231mmol) was additionally contained in the mini bombe, and after assembling the mini bombe, anhydrous THF (30mL) was added to the mini bombe using canuula, and hydrogen was added to a pressure of about 30 bar. I filled it. Subsequently, after the mixture contained in the mini bombe was stirred at about 60°C for about 1 day, the temperature of the mini bombe was cooled to room temperature, and hydrogen was replaced with argon while gradually reducing the pressure of the mini bombe.

Meanwhile, celite, which was dried for about 2 hours in an oven at about 120° C., was placed on a schlenk filter, and the reaction product of the mini bombe was filtered under argon using this. The celite removed the PtO ₂ catalyst from the reaction product. Subsequently, the reaction product from which the catalyst was removed was decompressed to remove the solvent to obtain a product that was a pale yellow solid (0.601 g, 1.31 mmol, Mw: 458.65 g/mol).

¹ H NMR (500 MHz, CDCl ₃ ): 0.82 (3H, s), 0.88 (3H, s), 1.92 (6H, s), 1.99 (3H, s), 2.05 (3H, s), 2.34 (2H, m), 2.54 (2H, m), 2.68 (2H, m), 3.03 (2H, m), 5.45 (1H, s), 6.67 (1H, s).

Synthesis Example 4: Second metallocene compound

Preparation of 4-1 ligand compound

11.618 g (40 mmol) of 4-(4-(tert-butyl)phenyl)-2-isopropyl-1H-indene was added to a dried 250 mL schlenk flask and 100 mL of THF was injected under argon. After cooling the diethylether solution to 0°C, 18.4 mL (46 mmol) of 2.5 M nBuLi hexane solution was slowly added dropwise. The reaction mixture was slowly raised to room temperature and stirred until the next day. In another 250 mL schlenk flask, 12.0586 g of dichloromethyltethersilane (40 mmol, 90% purity calculated) and 100 mL of Hexane were prepared and the Schlenk flask was cooled to -30°C, and then the Lithiated solution was added dropwise thereto. After the injection, the mixture was slowly raised to room temperature and stirred for one day. The next day, 33.6 mL of NaCp in 2M THF was added dropwise and stirred for 1 day. Then, 50 mL of water was added to the flask to quenching and the organic layer was separated and dried with MgSO ₄ . As a result, 23.511 g (52.9 mmol) of oil was obtained (purity/wt% based on NMR = 92.97%. Mw =412.69).

4-2 Preparation of metallocene compound

The ligand was added to a dry 250 mL schlenk flask in Oven, dissolved in 80 mL of Toluene and 19 mL (160 mmol, 4 equiv.) of Toluene, and 2.1 equivalents of nBuLi solution (84 mmol, 33.6 mL) was added to lithiation until the next day. One equivalent of ZrCl ₄ (THF) ₂ was taken in a glove box and placed in a 250 mL schlenk flask to prepare a suspension with Ether. After cooling both flasks to -20 °C, ligand anion was slowly added to the Zr suspension. After the injection was completed, the reaction mixture was slowly raised to room temperature. After stirring for one day, the MTBE in the mixture was filtered directly under Argon with a Schlenk Filter to remove the resulting LiCl. After removal, the remaining filtrate was removed through vacuum decompression, and a small amount of pentane was added to a small amount of dichloromethane as a reaction solvent. The reason for adding pentane is that the synthesized catalyst precursor promotes crystallization because its solubility in pentane is low. The slurry was filtered under argon, and the remaining filter cake and filtrate were checked for catalytic synthesis through NMR, weighed and sampled in a glove box, and yield and purity were checked (Mw = 715.04).

¹ H NMR (500 MHz, CDCl ₃ ): 0.60 (3H, s), 1.01 (2H, m), 1.16 (6H, s), 1.22 (9H, s), 1.35 (4H, m), 1.58 (4H, m), 2.11 (1H, s), 3.29 (2H, m), 5.56 (1H, s), 5.56 (2H, m), 5.66 (2H, m), 7.01 (2H, m), 7.40 (3H, m) ), 7.98 (2H, m)

Synthesis Example 5: Second metallocene compound

Preparation of 5-1 ligand compound

Under THF, 6-tert-butoxyhexyl chloride and sodium cyclopentadiene (2 equivalents) were added and stirred. After completion of the reaction, workup was carried out with water and excess cyclopentadiene was distilled off. 27 mL of toluene was added to 4.45 g (20 mmol) of 6-tert-butoxyhexylcyclopentadiene obtained through the above process. The temperature was lowered to -20 °C and 8.8 mL (22 mmol) of 2.5 M n-BuLi Hexane solution was added dropwise and stirred overnight at room temperature.

5.8 g (20 mmol) of 4-(4-(tert-butyl)phenyl)-2-isopropyl-1H-indene was added to a dried 250 mL Schlenk flask and 33 mL of MTBE was added. The temperature was lowered to -20°C, and 8.8 mL (22 mmol) of 2.5 M n-BuLi Hexane solution was added dropwise and stirred overnight at room temperature. The temperature was lowered to -20 °C and dichlorodimethyl silane was added in 1.5 equivalents. The mixture was stirred overnight at room temperature and distilled to remove excess dichlorodimethyl silane.

The solution lithiated with 6-tert-butoxyhexylcyclopentadiene was introduced into the above flask and stirred overnight. A ligand compound was obtained by workup of the ligand synthesized by this process.

5-2 Preparation of metallocene compound

11.4 g (20 mmol) of the ligand compound synthesized in 5-1 was dissolved in 50 mL of toluene, and about 16.8 mL (42 mmol) of 2.5M nBuLi hexane solution was added dropwise and stirred overnight at room temperature. 20 mmol of ZrCl ₄ (THF) ₂ was added and stirred overnight, and when the reaction was complete, FiClration was performed to remove LiCl. After removing all the solvent, crystallized with Hexane, and purified, metallocene compounds (A and B forms) having different stereoisomers were obtained in a ratio of 1.3:1.

¹ H NMR (500 MHz, C ₆ D ₆ ):

Form A: 0.58 (3H,s), 0.55 (3H,s), 0.93-0.97 (3H,m), 1.12 (9H,s), 1.28 (9H,s), 1.27 (3H,d), 1.35-1.42 (1H,m), 1.45-1.62(4H,m), 2.58-2.65 (1H,m), 2.67-2.85(2H,m), 3.20 (2H,t), 5.42 (1H,m), 5.57 (1H , m), 6.60 (1H, m), 6.97 (1H, dd), 7.27 (1H, d), 7.39-7.45 (4H, m), 8.01 (2H, dd)

Form B: 0.60 (3H,s), 0.57 (3H,s), 0.93-0.97 (3H,m), 1.11 (9H,s), 1.28 (9H,s), 1.32 (3H,d), 1.35-1.42 (1H,m), 1.45-1.62(4H,m), 2.58-2.65 (1H,m), 2.67-2.85(2H,m), 3.23 (2H,t), 5.24 (1H,m), 5.67 (1H , m), 6.49 (1H, m), 6.97 (1H, dd), 7.32 (1H, d), 7.39-7.45 (4H, m), 8.01 (2H, dd)

Comparative Synthesis Example 1: Second metallocene compound

Preparation of 1-1 ligand compound

6-Chlorohexanol was used to prepare t-Butyl-O-(CH ₂ ) ₆ -Cl by the method given in Tetrahedron Lett. 2951 (1988), and NaCp was reacted therewith. t-Butyl-O-(CH ₂ ) ₆ -C ₅ H ₅ was obtained (yield 60%, bp 80°C /0.1 mmHg)

1-2 Metallocene Preparation of compounds

At -78°C, t-Butyl-O-(CH ₂ ) ₆ -C ₅ H ₅ was dissolved in THF, normal butyllithium (n-BuLi) was slowly added, and the temperature was raised to room temperature, followed by reaction for 8 hours. The solution was again added to a suspension solution of ZrCl ₄ (THF) ₂ (1.70 g, 4.50 mmol)/THF (30 mL) at −78° C., and a lithium salt solution pre-synthesized was slowly added to the room temperature. The reaction was carried out for 6 hours.

All volatiles were dried in vacuo and filtered by adding a hexane solvent to the obtained oily liquid substance. After drying the filtered solution under vacuum, hexane was added to induce a precipitate at low temperature (-20°C). The obtained precipitate was filtered at low temperature to obtain [tBu-O-(CH ₂ ) ₆ -C ₅ H ₄ ] ₂ ZrCl ₂ compound as a white solid (yield 92%).

¹ H NMR (300 MHz, CDCl3): 6.28 (t, J = 2.6 Hz, 2H), 6.19 (t, J = 2.6 Hz, 2H), 3.31 (t, 6.6 Hz, 2H), 2.62 (t, J = 8 Hz), 1.7-1.3 (m, 8H), 1.17 (s, 9H)

Comparative Synthesis Example 2: Second metallocene compound

Preparation of 2-1 ligand compound

3.7 g (40 mmol) of 1-chlorobutane was added to a dried 250 mL Schlenk flask and dissolved in 40 mL of THF. After slowly adding 20 mL of sodium cyclopentadienylide THF solution, the mixture was stirred for one day. The reaction mixture was quenched by adding 50 mL of water, extracted with ether (50 mL x 3), and the collected organic layer was sufficiently washed with brine. After drying and filtering the remaining water with MgSO ₄ , the solvent was removed under vacuum reduced pressure to obtain 2-butyl-cyclopenta-1,3-diene, a dark brown viscous product, in quantitative yield.

2-2 Preparation of metallocene compound

About 4.3 g (23 mmol) of the ligand compound synthesized in 5-1 was added to a dried 250 mL Schlenk flask and dissolved in about 60 mL of THF. To this, about 11 mL of n-BuLi 2.0M hexane solution (28 mmol) was added and stirred overnight, and then this solution was dissolved in 3.83 g (10.3 mmol) of ZrCl ₄ (THF) ₂ in about 50 mL of ether flask To -78 ℃ was added slowly.

When the reaction mixture was raised to room temperature, the pale brown suspension turned to a pale yellow suspension. After stirring for one day, the solvent of the reaction mixture was dried, and about 200 mL of hexane was added to allow sonication to settle, and then the hexane solution floated on the upper layer was collected by decantation with cannula. The hexane solution obtained by repeating this process twice was dried under vacuum reduced pressure to confirm that bis(3-butyl-2,4-dien-yl) zirconium(IV) chloride, a pale yellow solid compound, was produced.

¹ H NMR (500MHz, CDCl ₃ ): 0.91 (6H, m), 1.33 (4H, m), 1.53 (4H, m), 2.63 (4H, t), 6.01 (1H, s), 6.02 (1H, s) ), 6.10 (2H, s), 6.28 (2H, s)

<Production example of hybrid supported metallocene catalyst>

Preparation Example 1

In a 20L SUS high pressure reactor, 2.0 kg of toluene and 1000 g of silica (Grace Davison, SP2410) were added, and the reactor was stirred while raising the temperature to 40°C. To the reactor, 5.4 kg of methylaluminoxane (10 wt% in toluene, manufactured by Albemarle) was added, and the temperature was raised to 70° C., followed by stirring at about 200 rpm for about 12 hours. Thereafter, the temperature of the reactor was lowered to 40° C., and stirring was stopped. Then, after the reaction product was left for about 10 minutes, decantation was performed. Again, 2.0 kg of toluene was added to the reaction product, stirred for about 10 minutes, stopped stirring and left for about 30 minutes, and then decantation.

Into the reactor, 2.0 kg of toluene was added, and then the compound (60 mmol) prepared in Synthesis Example 1 and the compound (10 mmol) prepared in Synthesis Example 4 and 1000 mL of toluene were added. The temperature of the reactor was raised to 85° C. and stirred for about 90 minutes.

Thereafter, the temperature of the reactor was lowered to room temperature, the stirring was stopped, the reaction product was allowed to stand for about 30 minutes, and then the reaction product was decantation. Subsequently, 3 kg of hexane was added to the reactor, the hexane slurry solution was transferred to a 20 L filter dryer, and the solution was filtered and dried under reduced pressure at 50° C. for about 4 hours to obtain 1.5 kg of supported catalyst.

Preparation Example 2

A hybrid supported metallocene catalyst was prepared in the same manner as in Preparation Example 1, except that the metallocene compounds of Synthesis Example 2 (60 mmol) and Synthesis Example 4 (10 mmol) were used.

Preparation Example 3

A hybrid supported metallocene catalyst was prepared in the same manner as in Preparation Example 1, except that the metallocene compounds of Synthesis Example 3 (60 mmol) and Synthesis Example 5 (10 mmol) were used.

Comparative Production Example 1

A supported metallocene catalyst was prepared in the same manner as in Preparation Example 1, except that only the metallocene compound of Synthesis Example 1 (70 mmol) was used.

Comparative Preparation Example 2

A hybrid supported metallocene catalyst was prepared in the same manner as in Preparation Example 1, except that the metallocene compounds of Synthesis Example 1 (60 mmol) and Comparative Synthesis Example 1 (10 mmol) were used.

Comparative Preparation Example 3

A supported metallocene catalyst was prepared in the same manner as in Preparation Example 1, except that the metallocene compounds of Synthesis Example 2 (60 mmol) and Comparative Synthesis Example 2 (10 mmol) were used.

The main configurations of the above preparations and comparative preparations are shown in Table 1 below.

Preparation Example 1 Preparation Example 2 Preparation Example 3 Comparative Production Example 1 Comparative Preparation Example 2 Comparative Preparation Example 3 Support type concoction
Loading concoction
Loading concoction
Loading Exclusive
Loading concoction
Loading concoction
Loading Metallocene compound composition Synthesis Example 1 / Synthesis Example 4 Synthesis Example 2 /
Synthesis Example 4 Synthesis Example 3 /
Synthesis Example 5 Synthesis Example 1 Synthesis Example 1
/Comparative Synthesis Example 1 Synthesis Example 2
/Comparative Synthesis Example 2 Metallocene compound ratio
(Molar ratio) 6:1 6:1 6:1 6:1 6:1

<Polyolefin production Example >

Ethylene-1-hexene copolymerization

As a polymerization reactor, an isobutene slurry loop process is possible, and a 140L continuous polymerization reactor operating at a reaction flow rate of about 7 m/s was prepared. Then, the reactants required for olefin polymerization were continuously charged to the reactor as shown in Table 2.

As the supported catalyst used in each olefin polymerization reaction, those prepared in the preparation examples shown in Table 1 were used, and the supported catalyst was mixed with isobutene slurry and added.

The olefin polymerization reaction was carried out under a pressure of about 40 bar and a temperature of about 84 °C.

Table 2 shows the main conditions of the polymerization reaction.

Example 1 Example 2 Example 3 Comparative Example 1 Comparative Example 2 Comparative Example 3 catalyst Preparation Example 1 Preparation Example 2 Preparation Example 3 Comparative Production Example 1 Comparative Preparation Example 2 Comparative Preparation Example 3 Ethylene input (kg/hr) 40 40 40 40 40 40 Hydrogen input (ppm) 15 17 19 22 11.5 9 Hexene input 13 12.5 15 16 14 14.5 Slurry Density (g/L) 560 560 563 560 559 558 Active (kgPE/kgSiO ₂ hr) 6.5 5.4 5.1 4.9 6.9 6.6 Bulk density(g/mL) 0.40 0.42 0.39 0.38 0.40 0.41 Settling efficiency (%) 40 40 40 40 40 40

< Experimental Example >

The physical properties of the polyolefins prepared in Examples and Comparative Examples were measured as follows, and the results are shown in Table 3 below.

When extruding to measure haze and drop impact strength, an antioxidant (Irganox 1010 + Igafos 168, CIBA) was prescribed to the obtained polyolefin, and then 180 was used using a twin screw extruder (W&P Twin Screw Extruder, 75 pi, L/D=36). Granulated at an extrusion temperature of ~ 210 °C.

(1) Density (density): was measured according to ASTM D1505 standard.

(2) Melt Index (MI _2.16 ): Measured according to ASTM D1238 (Condition E, 190° C., 2.16 kg load) standard.

(4) Haze: A single-screw extruder (Eugene Engineering Single Screw Extruder, Blown Film M/C, 50 pi) was used, and inflation molding was performed to a thickness of 60 µm at an extrusion temperature of 130 to 170°C. At this time, the die gap was 2.0 mm, and the blown-up ratio was 2.3. The film thus prepared was measured according to the ISO 13468 standard. At this time, the average value was taken by measuring 10 times per specimen.

(4) Drop impact strength: After preparing a polymer film under the same conditions as (3), the average value was taken by measuring 20 or more times per film sample according to ASTM D1709 [Method A] standard.

(5) SSA thermogram

Using a differential scanning calorimeter (device name: DSC8000, manufacturer: PerkinElmer), the polyolefin was initially heated to 160° C. and maintained for 30 minutes to remove all heat history before measurement of the sample.

After the temperature was lowered from 160°C to 122°C, the temperature was maintained for 20 minutes, the temperature was decreased to 30°C, and then maintained for 1 minute, and the temperature was increased again. Next, after heating to a temperature 5°C lower than the initial heating temperature of 122°C (117°C), the temperature was maintained for 20 minutes, the temperature was reduced to 30°C, and then maintained for 1 minute, and then the temperature was increased again. In this way, the n+1th heating temperature was 5°C lower than the nth heating temperature, and the holding time and cooling temperature were the same, and the heating temperature was gradually lowered to 52°C. At this time, the temperature rising rate and the falling rate were respectively adjusted to 20°C/min. Lastly, SSA thermogram was measured by increasing the temperature at a heating rate of 10°C/min from 30°C to 160°C and observing the heat change.

(6) Inhomogeneity of ethylene sequence (inhomogeneity, I)

The heterogeneity of the ethylene sequence calculated according to Equation 1 below was calculated:

[Equation 1]

Inhomogeneity (I) = L _w / L _n

In the above formula 1,

L _w is the weighted average of the Ethylene Sequence Length (ESL), and L _n is the arithmetic mean of the Ethylene Sequence Length (ESL) (unit: nm).

The weighted average (L _w ) and the arithmetic mean (L _n ) of the ethylene sequence of Equation 1 were calculated by the following Equations 2 and 3:

[Equation 2]

In the formula 2,

[Equation 3]

In the above formulas 2 and 3,

S _i is the area of each melting peak measured in the SSA thermogram,

L _i is ASL (Average Ethylene Sequence Length) corresponding to each melting peak in the SSA thermogram.

In addition, the ASL is from the SSA thermogram measured as above Journal of Polymer Science Part B: Polymer Physics. 2002, vol. 40, 813-821 and Journal of the Korean Chemical Society 2011, Vol. 55, No. It was calculated with reference to 4.

In addition, Figure 1 shows a graph showing the relationship between drop impact strength and inhomogeneity (inhomogeneity) of the polyolefin according to Examples and Comparative Examples of the present invention.

Example 1 Example 2 Example 3 Comparative Example 1 Comparative Example 2 Comparative Example 3 Density (g/cm ³ ) 0.918 0.918 0.917 0.918 0.918 0.918 MI _2.16 (g/10min) 0.96 1.09 0.99 1.23 1.03 1.13 L _n (nm) 10.54 13.27 11.46 10.48 10.34 10.62 L _w (nm) 11.18 14.45 14.77 12.697 12.81 13.19 I (L _w / L _n ) 1.26 1.29 1.29 1.24 1.24 1.24 Drop impact strength
(g) 1,390 1,250 1,210 960 1,050 1,010 Haze (%) 8.5 9.1 10.9 9.4 12.2 11.6

Referring to Table 3 and FIG. 1, the polyolefins of Examples 1 to 3 of the present invention had superior drop impact strength compared to Comparative Examples 1 to 3 having a haze of 11% or less and the same density.

Claims (12)

Density from 0.915 g/cm ³ to 0.930 g/cm ³ ; And
In the case of SSA (Successive Self-nucleation and Annealing) analysis, the ethylene sequence (inhomogeneity, I) calculated by Equation 1 below is 1.25 to 1.40,
Polyolefin:
[Equation 1]
Inhomogeneity (I) = L _w / L _n
In the above formula 1,
L _w is the weighted average of the Ethylene Sequence Length (ESL), and L _n is the arithmetic mean of the Ethylene Sequence Length (ESL) (unit: nm).
According to claim 1,
Wherein L _n is calculated by the following formula 2, the L _w is calculated by the following formula 3, polyolefin:
[Equation 2]

[Equation 3]

In 2 and 3 above,
S _i is the area of each melting peak measured in the SSA thermogram,
L _i is ASL (Average Ethylene Sequence Length) corresponding to each melting peak in the SSA thermogram.
According to claim 1,
The SSA, using a differential scanning calorimeter, heats the polyolefin to 120 to 124°C at the first heating temperature, holds it for 15 to 30 minutes, cools it to 28 to 32°C, and the n+1th heating temperature is Polyolefin, which is carried out by repeating the heating-annealing-quenching until the final heating temperature is 50-54 DEG C while lowering the heating temperature in steps of 3 to 7 DEG C lower than the n-th heating temperature.
According to claim 1,
A polyolefin having a melt index (MI _2.16 ) of 0.5 to 1.5 g/10min measured under a temperature of 190° C. and a load of 2.16 kg according to ASTM D1238 standard.
According to claim 1,
After producing a polyolefin film (BUR 2.3, film thickness 55 to 65 μm) using a film forming machine, the haze of the film measured according to ISO 13468 is 11% or less, polyolefin.
According to claim 1,
After preparing a polyolefin film (BUR 2.3, film thickness 55 to 65 μm) using a film forming machine, the drop impact strength measured according to ASTM D 1709 [Method A] is 850 g or more, polyolefin.
According to claim 1,
The polyolefin is a copolymer of ethylene and alpha olefin, polyolefin.
The method of claim 7,
The alpha olefin is propylene, 1-butene, 1-pentene, 4-methyl-1-pentene, 1-hexene, 1-heptene, 1-octene, 1-decene, 1-undecene, 1-dodecene, 1 -Tetradecene, 1-hexadecene, 1-eicosen, norbornene, norbornadiene, ethylidene novoden, phenyl novoden, vinyl novoden, dicyclopentadiene, 1,4-butadiene, 1,5-penta A polyolefin comprising at least one member selected from the group consisting of diene, 1,6-hexadiene, styrene, alpha-methylstyrene, divinylbenzene and 3-chloromethylstyrene.
According to claim 1,
The polyolefin is at least one first metallocene compound selected from compounds represented by Formula 1 below; At least one second metallocene compound selected from compounds represented by Formula 2 below; And in the presence of a hybrid supported metallocene catalyst comprising a carrier for supporting the first and second metallocene compounds, a polyolefin produced by polymerizing an olefin monomer:
[Formula 1]

In Chemical Formula 1,
Q ₁ and Q ₂ are the same as or different from each other, and each independently halogen, C1 to C20 alkyl group, C2 to C20 alkenyl group, C2 to C20 alkoxyalkyl group, C6 to C20 aryl group, C7 to C20 alkylaryl Group or a C7 to C20 arylalkyl group;
T ₁ is carbon, silicon, or germanium;
M ₁ is a Group 4 transition metal;
X ₁ and X ₂ are the same as or different from each other, and each independently halogen, C1 to C20 alkyl group, C2 to C20 alkenyl group, C6 to C20 aryl group, nitro group, amido group, C1 to C20 alkylsilyl group , C1 to C20 alkoxy group, or C1 to C20 sulfonate group;
R ₁ to R ₁₄ are the same or different from each other, and each independently hydrogen, halogen, C1 to C20 alkyl group, C1 to C20 haloalkyl group, C2 to C20 alkenyl group, C1 to C20 alkylsilyl group, C1 to C20 Is a silylalkyl group, a C1 to C20 alkoxysilyl group, a C1 to C20 alkoxy group, a C6 to C20 aryl group, a C7 to C20 alkylaryl group, or a C7 to C20 arylalkyl group, or R ₁ to R ₁₄ Two or more adjacent to each other are connected to each other to form a substituted or unsubstituted aliphatic or aromatic ring;
[Formula 2]

In Chemical Formula 2,
Q ₃ and Q ₄ are the same or different from each other, and each independently halogen, C1 to C20 alkyl group, C2 to C20 alkenyl group, C2 to C20 alkoxyalkyl group, C6 to C20 aryl group, C7 to C20 alkylaryl Group or a C7 to C20 arylalkyl group;
T ₂ is carbon, silicon, or germanium;
M ₂ is a Group 4 transition metal;
X ₃ and X ₄ are the same as or different from each other, and each independently halogen, C1 to C20 alkyl group, C2 to C20 alkenyl group, C6 to C20 aryl group, nitro group, amido group, C1 to C20 alkylsilyl group , C1 to C20 alkoxy group, or C1 to C20 sulfonate group;
R ₁₅ to R ₂₈ are the same or different from each other, and each independently hydrogen, halogen, C1 to C20 alkyl group, C1 to C20 haloalkyl group, C2 to C20 alkenyl group, C2 to C20 alkoxyalkyl group, C1 to C20 An alkylsilyl group, a C1 to C20 silylalkyl group, a C1 to C20 alkoxysilyl group, a C1 to C20 alkoxy group, a C6 to C20 aryl group, a C7 to C20 alkylaryl group, or a C7 to C20 arylalkyl group, However, R ₂₀ and R ₂₄ are the same or different from each other, or each independently a C1 to C20 alkyl group, or two or more adjacent to each other among R ₁₅ to R ₂₈ are connected to each other to be substituted or unsubstituted aliphatic or aromatic rings. Is to form.
The method of claim 9,
The compound represented by Formula 1 is any one of the compounds represented by the following structural formula, polyolefin:

,

,

,

,

,

,

,

The method of claim 9,
The compound represented by Formula 2 is any one of the compounds represented by the following structural formula, polyolefin:

,

,

,

The method of claim 9,
The molar ratio of the first and second metallocene compounds is 1:1 to 10:1, polyolefin.

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