CN1067689C - Metallocene catalyst for polymerizing high molecular weight polyethylene and preparation thereof - Google Patents
Metallocene catalyst for polymerizing high molecular weight polyethylene and preparation thereof Download PDFInfo
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- CN1067689C CN1067689C CN95116584A CN95116584A CN1067689C CN 1067689 C CN1067689 C CN 1067689C CN 95116584 A CN95116584 A CN 95116584A CN 95116584 A CN95116584 A CN 95116584A CN 1067689 C CN1067689 C CN 1067689C
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Abstract
The present invention relates to a metallocene catalyst for synthesizing polyethylene with high molecular weight and a preparation method thereof. A main catalyst is formed by the reaction of a compound with dimolecular tetrahydrofuran and the dilithium salt of 1, 3-2(1-indene) disiloxene, and the compound is prepared from transition metal halide in intetrahydrofuran. When used for the polymerization of ethylene or the copolymerization of ethylene-alpha-olefin (-alpha-olefin containing 3 to 13 carbon atoms), the catalyst has high activity; a polymer is low-density polyethylene with high molecular weight and the high melting point of 120 to 140 DEG C.
Description
The invention relates to a kind of Catalysts and its preparation method of synthetic macromolecule weight northylen.
The Ziegler-Natta heterogeneous catalyst is made promotor synthesizing super high molecular weight polyethylene with common alkylaluminium cpd and is used in industrial acquisition.Adopt titanium sub-group compound mostly, with magnesium chloride as carrier, titanium content～3wt% in the catalyzer, ethylene polymerization activity can reach 1,000,000 times (106g PE/MTi.h.bar) in every mole of titanium, PE weight-average molecular weight Mw 6,000,000 (CN1076456A), but the wide MWD of molecular weight distribution＞14 (Journal of PolymerScience:PartA:Polymer Chemistry, 28,15-38 (1990).
Adopt the metallocenyl compound as Primary Catalysts, (use methylaluminoxane always, MAO) make the homogeneous catalysis system of promotor, synthesizing polyethylene and linear low density polyethylene are the new technologies of development recent years to aikyiaiurnirsoxan beta.Be characterized in the catalytic activity height, polymer MW D is narrow, and multipolymer has neat branched structure, has good processing properties, but the more heterogeneous catalyst system of its molecular weight is generally on the low side.As Cp
2Z
5Cl
2/ MAO system, ethylene polymerization activity can reach 1 * 10
6G PE/MZr.h.bar, (Polymer 35 but its Mw is no more than 300,000,4,808-818 (1994), the viscosity-average molecular weight M η less than 10,000 of b-propylene copolymer had both made in down polymerization of low temperature (15 ℃), and its Mw also only has 150,000, and (Macromolecules 27,1325-1328 (1994), the luxuriant Et of zirconium (Ind) of employing ethidene bridged linkage
2ZrCl
2/ MAO system ethylene polymerization activity can reach 10
7, but Mw is only at (Macromol.Rapid Commun.16,357-362 (1995) below 20,000.Report beta-diketon zirconium (acac) is arranged recently
2ZrCl
2(acac=Acetylacetonate)/MAO system ethylene polymerization activity 1 * 10
6, about 500,000 (Macromol.Rapid Commun15, the 655-658 (1994) of Mw.
The objective of the invention is to overcome the wide and low shortcoming of homogeneous catalyst PE molecular weight of heterogeneous catalyst PE molecular weight distribution, and synthetic a kind of metalloscene catalyst has the high polymerization activity of homogeneous catalysis system concurrently, and polymkeric substance has narrow molecular weight distributions to have the high molecular that heterogeneous catalyst possesses again, forms ethylene polymerization activity nearly 10 in the homogeneous catalysis system with metalloscene catalyst of the present invention and MAO
7, the polyethylene weight-average molecular weight can be regulated at 1-200 ten thousand.
Vinyl polymerization of the present invention, ethene-alpha-olefin copolymerization metalloscene catalyst comprise Primary Catalysts and two kinds of components of promotor, and wherein the Primary Catalysts component is to contain the IV of silica support bridge linkage group or the cyclopentadienyl compound of V transiting metal group.Has following structure.
Mt=titanium Ti or zirconium Zr or hafnium Hf or vanadium V or niobium Nb or tantalum Ta.
Y
1, Y
2Be respectively identical or different indenyl or tetrahydro indenyl or cyclopentadienyl or fluorenyl or have alkyl or the substituent above-mentioned group of silylation.
R
1, R
2, R
3, R
4Be respectively identical or different C
1～C
10Alkyl or alkoxyl group or aryl, described aryl is phenyl or substituted-phenyl or aralkyl or aryloxy.Be preferably identical or different C
1～C
3Alkyl or alkoxyl group.
X
1, X
2Be respectively identical or different halogen, be preferably chlorine element or alkyl or benzyl or alkoxyl group.
Described catalyzer can be 1,3-tetramethyl-two silica support bridging two (1-indenyl) zirconium dichloride or 1,3-tetramethyl-two silica support bridging two (1-tetrahydro indenyl) zirconium dichloride or 1,3-tetramethyl-two silica support bridging two (1-indenyl) titanium dichloride or 1,3-tetramethyl-two silica support bridging two (1-tetrahydro indenyl) titanium dichloride.
The promotor component is an organo-aluminium compound.Can be alumina alkane and aluminum alkyls compounds, described alumina alkane has following structure
R=-CH wherein
3,-C
2H
5,-i-Butyl, n=5-30;
Described aluminum alkyls class has following molecular formula
AlR
nX
3-n
R=-CH wherein
3,-C
2H
5,-i-Butyl
X=R,F,Cl,Br
n=1-3
Or positively charged ion generation agent, it is the ion-pair compound that contains four perfluorophenyl boron anions that above-mentioned positively charged ion generates agent.Has following molecular formula
[Ph
3C]
+[B(C
6F
5)
4]
-
Preparation of catalysts technology characteristics of the present invention is as follows:
1, catalyzer of the present invention is by the mixture (I) and 1 of transition metal halide and tetrahydrofuran (THF) (THF), and two lithium salts (II) reaction of 3-two (1-indenyl)-two silica support forms.
2, transition metal halide muriate preferably.In the THF solvent, generate the mixture that has two molecule THF and separate the back as reactant (I).
3,1,3-two (1-indenyl) sily oxide is preferably in 0 ℃ at-2 ℃-40 ℃ and is added dropwise to the n-BuLi hexane solution in the THF medium, and wherein 1,3-two (1-indenyl) sily oxide: n-BuLi=1: 2～3 mol ratios are preferably 1: 2.Be warming up to room temperature reaction 1-4h and be preferably 2h, obtain 1, the two lithium salt solutions (II) of 3-two (1-indenyl) two silica support.
4, in the THF of (I) solution, at 0 ℃-40 ℃, be preferably in 25 ℃ and drip (II) solution down, finish post-heating backflow 2-24h, preferably 12h except that after desolvating, obtains product with ether extraction.
The present invention adopts the preparation method of metalloscene catalyst synthetic High molecular weight polyethylene as follows:
In the toluene medium, add organo-aluminium compound respectively, preferably methylaluminoxane, and metalloscene catalyst, its mol ratio remains on 1000～5000, is preferably in 2500, at-20～90 ℃, preferably 20-60 ℃, under the temperature, under ethene atmosphere or C arranged
3-C
12The existence of 'alpha '-olefin monomers under carry out ethylene homo or ethene-alpha-olefin copolymerization.Polymerization time is 10 minutes to 3 hours.Stop polyreaction with acidifying methyl alcohol, obtaining ultra-high molecular weight through washing, drying is 1,500,000～2,000,000 polyethylene.
Adopt catalyst system vinyl polymerization of the present invention or ethene-alpha-olefin (alpha-olefin that contains 3-12 carbon) copolymerization have high reactivity reach～10
7It is adjustable that g PE/mol.Mt.h.bar, polymkeric substance have ultra-high molecular weight Mw1-200 ten thousand, 120-140 ℃ of high-melting-point Tm, high-crystallinity 65-96%, narrow molecular weight distribution MWD2.7-5.2, new LDPE (film grade) that can integral density scope 0.91-0.925.
Embodiment 1:1,3-tetramethyl-two silica support bridging two (1-indenyl) zirconium dichloride (catalyzer 1)
To 8.33g (22.08mmol) ZrCl
4Drip by 8g (22.08mmol) 1 two lithium salt solutions that 3-two (1-indenyl) tetramethyl disiloxane and 44.16mmoln-BuLi hexane solution make, reflux 12h in the suspension of 2THF and 100mL THF.The pressure reducing and steaming solvent is used CH then
2Cl
2Extract.Extracting solution concentrate crude product.Use CH
2Cl
2With the sherwood oil recrystallization, get 3.33g (28.85%) rac-1 and 1.27g (10.40%) meso-1.
rac-1:mp 195-6℃。C
22H
24Cl
2OSi
2Zr ultimate analysis (%, calculated value):
C50.60(50.55)；H4.70(4.63)。m/z:522(M
+,38.85％)。
-1HNMR (CDCl
3, the TMS external standard, 200MHz), δ: 7.82 (d, 2H), 7.64 (d,
2H),7.40-7.20(m,4H),6.68(d,J=3.6Hz,2H),6.08(d,J=3.6Hz,
2H),0.65(s,6H)。0.44(s,6H)。
Meso-1:
-1HNMR (CDCl
3, the TMS external standard, 200MHz), δ: 7.63 (d, 2H), 7.48 (d, 2H), 7.30-7.10 (m, 4H), 7.02 (d, J=3.4Hz, 2H), 6.56 (d, J=3.4Hz, 2H), 0.57 (s, 6H), 0.50 (s, 6H).Ethylene homo:
At-a 250cc in three mouthfuls of reaction flasks that stirring is housed that nitrogen and ethene were replaced, add 100ml and receive the toluene that refluxes and distill out after removing moisture content through metal, be warming up to 50 ℃ under stirring, feed ethene, keep reaction flask internal pressure 0.1MPa. to add 0.625ml MAO toluene solution (11.6wt%, 1.25mmole), stir and add catalyzer 1 toluene solution (0.5 μ mole) Al/Zr after 5 minutes again.Mol ratio 2500 keeps the constant polymerization of ethylene pressure 60 minutes, adds 10ml acidifying methyl alcohol (3%HCl) and stops polyreaction, adds excess ethyl alcohol and continues to stir 1 hour.Filter, use acidifying methyl alcohol, ethanol and distilled water wash polymkeric substance respectively.60 ℃ of following vacuum-drying 4 hours obtains the 3.5g polymkeric substance.Viscosimetry is measured weight-average molecular weight Mw51.3 ten thousand g/mol, and differential scanning calorimeter (DSC) is measured Tm136.5 ℃ of melting point polymer, crystallinity X 96.0%, and the density gradient instrument is measured density D 0.9255g/cm
3
Embodiment 2: as the comparative example of example 1, add MAO 2.5mmole, Cp
2ZrCl
2, 1.0 μ mole, Al/Zr2500,50 ℃ of following polymerizations obtained polymkeric substance 1.90g in 13 minutes, measured Mw16.2 ten thousand, Tm132.6 ℃ of degree of crystallinity 91.8%, density 0.9343.
Example 3-7 is identical with the polymerizing condition of example 1 with catalyzer 1, finishes polymerization result and see Table 1 under different polymerization temperatures.
The vinyl polymerization of table 1 catalyzer 1 under differing temps
| Example | Catalyzer (μ mole) | The Al/Zr ratio | Time (branch) | Temperature (℃) | Polymkeric substance (g) | Polymkeric substance | ||||
| Mw (10) | Tm (℃) | Degree of crystallinity (%) | MWD | |||||||
| 3 4 5 6 7 | 0.5 0.5 0.5 2.0 0.5 | 2500 2500 2500 2500 2500 | 60 60 60 30 60 | 80 60 40 20 0 | 1.17 3.27 1.8O 4.25 1.34 | 7.4 30.0 78.6 114.5 l98.8 | 131.6 134.6 138.9 139.6 | 89.5 95.6 87.6 87.6 | 2.69 | |
Embodiment 8:1,3-tetramethyl-two silica support bridging two (1-tetrahydro indenyl) zirconium dichlorides (catalyzer 2) are by 1, and zirconium dichloride is through hydrogenation for 3-tetramethyl-two silica support bridgings two (1-indenyl), and recrystallization makes.
In the 250mL autoclave, add 1.598g rac-1,80mg PtO
2With 1OOmL CH
2Cl
2, at 8.4MPaH
2Following room temperature hydrogenation 8h.Filter, filtrate concentrating done, and uses CH
2Cl
2With the sherwood oil recrystallization, get light yellow crystal rac-21.164g (71.73%).mp130-1℃。C
22H
32Cl
2OSi
2Zr ultimate analysis (%, calculated value): C 49.68 (49.78); H 6.14 (6.08).m/z：530(M
+，19.54％)。
1HNMR (CDCl
3, the TMS external standard, 90MHz), δ: 6.50 (d, 2H), 6.00 (d, 2H), 3.20-2.32 (m, 8H), 1.92-1.52 (m, 8H), 0.42 (s, 6H), 0.32 (s, 6H).Similarly, obtain meso-2 by meso-1 hydrogenation.mp 269-270℃。m/z：530(M
+，21％)。
1HNMR (CDCl
3, the TMS external standard, 90MHz), 6:6.74 (d, 2H), 5.74 (d, 2H), 3.26-2.26 (m, 8H), 2.10-1.40 (m, 8H), 0.36 (s, 6H), 0.30 (s, 6H).
Ethylene homo
With catalyzer 22.0 μ mole, MAO 5 m mole, the Al/Zr mol ratio remains on 2500, and 60 ℃ of following polyase 13s 0 minute, other conditions were same as example 1 polymerizing condition, obtain polymkeric substance 3.09g, and Hw 0.76 ten thousand, Tm131.6 ℃, degree of crystallinity 89.5%.
Embodiment 9-11 finishes polymerization result with catalyzer 2 and lists in table 2 under differing temps
Table 2, the vinyl polymerization of catalyzer 2 under differing temps
| Example | Catalyzer (μ mole) | The Al/Zr ratio | Time (branch) | Temperature (℃) | Polymkeric substance (g) | Polymkeric substance | |||
| Mw (10 4) | Tm (℃) | Degree of crystallinity (%) | |||||||
| 9 10 11 | 2.0 2.0 2.0 | 2500 2500 2500 | 30 30 30 | 40 20 0 | 5.70 5.43 1.4l | 12.9 35.7 72.3 | 136.3 | 86.7 | |
Embodiment 12:1,3-tetramethyl-two silica support bridging two (1-indenyl) titanium dichloride (catalyzer 3)
To 3,8g (11.38mmol) TiCl
4Drip by 4.139 (11.38mmO1) 1 two lithium salt solutions that 3-two (1-indenyl) tetramethyl disiloxane and 22.76mmoln-BuLi hexane solution make in the suspension of 2THF and 50mLTHF.Finish reflux 12h.After the removal of solvent under reduced pressure, extract with anhydrous diethyl ether.Extracting solution concentrates, and separates out the brownish black crystal.Filter, get 0.8g 3 (14.66%).Mp188-190 ℃ of .C
22H
24Cl
2OSi
2Ti ultimate analysis (%, calculated value): C54.67 (55.12); H5.05 (5.05).
1HNMR (CDCl
3, the TMS external standard, 400MHz), δ: 7.86 (d, 8.0Hz, 2H, 7.61 (d, 8.8Hz, 2H), 7.46 (pseudo-t, 7.6Hz, 2H), 7.34 (pseudo-t, 7.6Hz, 2H), 6.71 (d, 2.8Hz, 2H), 5.88 (d, 3.6Hz, 2H), 0.70 (s, 6H), 0.39 (s, 6H).
m/z:478(M
+,68.4％)。
Embodiment 13:1,3-tetramethyl-two silica support bridging two (1-tetrahydro indenyl) titanium dichloride (catalyzer 4)
In the 100mL autoclave, add 0.55g 3,100mg PtO2,70mLCH
2Cl
2, fill H
2To 7.1MPa, stirring at room 8h.Filter, remove desolvate crude product.Use CH
2Cl
2Recrystallization gets scarlet crystal 4 0.49g (88.18%).mp 133-4℃。C
22H
32Cl
2OSi
2Ti ultimate analysis (%, calculated value): C54.16 (54.22); H6.77 (6.62).
1HNMR (CDCl
3, the TMS external standard, 90MHz), δ: 6.60 (d, 3.6Hz, 2H), 5.88 (d, 3.6Hz, 2H), 3.22-2.34 (m, 8H), 1.82-1.30 (m, 8H), 0.30 (s, 6H).0.17(s,6H)。m/z:486(M
+,7％)
Ethylene homo
With catalyzer 41.0 μ mole, MAO 3mmole, the Al/Zr mol ratio remains on 3000, and 50 ℃ of following polyase 13s 0 minute, other conditions were same as example 1 polymerizing condition, obtain polymkeric substance 0.22g, and Mw 0.55 ten thousand.
Embodiment 14-17 finishes polymerization with catalyzer 4 under differing temps, the results are shown in table 3.
Table 3, the vinyl polymerization of catalyzer 4 under differing temps
| Example | Catalyzer (μ mole) | The Al/Zr ratio | Time (branch) | Temperature (℃) | Polymkeric substance (g) | Polymkeric substance | |||
| Mw (10 4) | Tm (℃) | Degree of crystallinity (%) | |||||||
| 14 15 16 17 | 1.0 1.0 1.0 1.0 | 3000 3000 3000 3000 | 30 30 30 30 | 40 30 20 0 | 0.51 1.10 1.72 0.64 | 1.56 4.16 4.74 21.4 | 135.0 | 79.7 | |
Embodiment 18: carry out with catalyzer 1 that ethene-alkene-1 copolymerization adds alkene 4.0ml successively in the 100ml toluene solvant, MAO 2.5mmole and catalyzer 1 1.0 μ mole, 50 ℃ of Al/Zr2500 constant temperature.Polymerization time 30 minutes obtains polymkeric substance 2.0g, and viscosimetry is measured Mw10.6 ten thousand g/mol DSC and measured 121.6 ℃ of Tm, and degree of crystallinity 65.3% is measured density 0.9190g/cm
3
Embodiment 19: as the comparative example of example 18, under the condition of example 18, add alkene 4.0 successively in toluene solvant, MAO 2.5mmole and catalyzer Cp
2ZrCl
2, 1.0 μ mole, Al/Zr2500,50 ℃ of constant temperature, polymerization time 20 minutes obtains polymkeric substance 0.67g, and Mw0.57 ten thousand, 111.2 ℃ of Tm, degree of crystallinity 65.4%, density 0.9245.
20-22 is identical with example 18 for example, finishes ethene-alkene-1 copolymerization with catalyzer 1 under different alkene-1 add-ons, the results are shown in Table 4.
Table 4, catalyzer 1 ethene-hexene-1 copolymerization example catalyzer H-l dosage polymer poly compound (μ mole) be (g) Mw Tm degree of crystallinity D (10 (ml)
4) (℃) (%) (g/cm
4) 20 1.0 0.8 3.0 26.5 129.5 80.121 1.0 1.2 2.6 18.7 127.5 70.5 0.921322 1.0 2.4 2.2 13.8 123.7 69.1 0.9198
Embodiment 23: carry out ethylene-octene-1 copolymerization with catalyzer 1
With embodiment 18, in toluene solvant, add octene-1 1.0me successively, MAO2.5mmole, catalyzer 1 1.0 μ mole keep 0.1MPa50 ℃ of ethylene pressure.Polymerization 10 minutes obtains polymkeric substance 1.53g, and Mw 35.4 ten thousand, Tm131.7 ℃, degree of crystallinity 76.5%, density 0.9231.
Embodiment 24-27 finishes copolymerization with different octene-1 add-ons and the results are shown in Table 4, and condition is with example 23.
(g) Mw Tm degree of crystallinity MWD D (10 of copolymerization example 0-1 dosage polymer poly compound (ml) under table 5, the catalyzer 1 different octene concentration
4) (℃) (%) (g/cm
4) 24 2.0 1.01 23.1 128.3 85.0 4.2 0.920025 4.0 0.91 19.1 126.8 81.1 0.917326 6.0 0.53 11.8 125.4 84.4 0.919227 8.0 0.59 9.6 120.7 68.9 0.9177
Claims (9)
1. metalloscene catalyst that is used for the synthetic macromolecule weight northylen, it is characterized in that described catalyzer comprises Primary Catalysts and two kinds of components of promotor, described Primary Catalysts is to contain the IV of silica support bridge linkage group or the cyclopentadienyl compound of V transiting metal group, has following structure:
Mt=titanium Ti or zirconium Zr or hafnium Hf or vanadium V or niobium Nb or tantalum Ta,
Y
1, Y
2Be respectively identical or different indenyl or tetrahydro indenyl or cyclopentadienyl or fluorenyl or have alkyl or the substituent above-mentioned group of silylation,
R
1, R
2, R
3, R
4Be respectively identical or different C
1～C
10Alkyl or alkoxyl group or aryl, described aryl is phenyl or substituted-phenyl or aralkyl or aryloxy,
X
1And X
2Be respectively identical or different halogen or alkyl or benzyl or alkoxyl group,
Described promotor is that organo-aluminium compound or positively charged ion generate agent.
2. a kind of metalloscene catalyst that is used for the synthetic macromolecule weight northylen according to claim 1 is characterized in that described R
1, R
2, R
3, R
4Be identical or different C
1-C
3Alkyl or alkoxyl group.
3, a kind of metalloscene catalyst that is used for the synthetic macromolecule weight northylen according to claim 1, it is characterized in that described catalyzer is 1,3-tetramethyl-two silica support bridging two (1-indenyl) zirconium dichloride or 1,3-tetramethyl-two silica support bridging two (1-tetrahydro indenyl) zirconium dichloride or 1,3-tetramethyl-two silica support bridging two (1-indenyl) titanium dichloride or 1,3-tetramethyl-two silica support bridging two (1-tetrahydro indenyl) titanium dichloride.
4, a kind of metalloscene catalyst that is used for the synthetic macromolecule weight northylen according to claim 1 is characterized in that described halogen is the chlorine element.
5, a kind of metalloscene catalyst that is used for the synthetic macromolecule weight northylen according to claim 1 is characterized in that described organo-aluminium compound is alumina alkane or alkylaluminium cpd.
6, a kind of metalloscene catalyst that is used for the synthetic macromolecule weight northylen according to claim 1 is characterized in that it is the ion-pair compound that contains four perfluorophenyl boron anions that described positively charged ion generates agent.
7, a kind of method for making that is used for the metalloscene catalyst of synthetic macromolecule weight northylen, it is characterized in that Primary Catalysts in the claim 1 is the mixture (I) and 1 by transition metal halide and tetrahydrofuran (THF) (THF), two lithium salts (II) of 3-two (1-indenyl)-two silica support react and form.
8, a kind of method for making that is used for the metalloscene catalyst of synthetic macromolecule weight northylen according to claim 7 is characterized in that described transition metal halide is a muriate.
9, a kind of method for making that is used for the metalloscene catalyst of synthetic macromolecule weight northylen according to claim 7, it is characterized in that described Primary Catalysts 1,3-tetramethyl-two silica support bridging two (1-tetrahydro indenyl) zirconium dichloride is by 1, zirconium dichloride is through hydrogenation for 3-tetramethyl-two silica support bridgings two (1-indenyl), and recrystallization makes.
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|---|---|---|---|
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| SG85150A1 (en) * | 1999-11-15 | 2001-12-19 | China Petrochemical Corp | Metallocene adduct, its preparation and its application in olefin polymerization |
| AU2002320636B8 (en) * | 2001-07-19 | 2005-09-15 | Univation Technologies, Llc | Mixed metallocene catalyst systems containing a poor comonomer incorporator and a good comonomer incorporator |
| WO2003008465A2 (en) * | 2001-07-19 | 2003-01-30 | Univation Technologies, Llc | Low comonomer incorporating metallocene catalyst compounds |
| US20050035481A1 (en) * | 2001-10-12 | 2005-02-17 | Sanjay Rastogi | Process to sinter ultra high molecular weight polyethylene |
| WO2015123177A1 (en) * | 2014-02-11 | 2015-08-20 | Univation Technologies, Llc | Producing polyolefin products |
| CN111016360A (en) * | 2019-12-20 | 2020-04-17 | 北京世兆科技有限公司 | High-temperature-resistant creep-resistant polyethylene heat shrinkable film and film blowing process thereof |
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| CN1105672A (en) * | 1994-11-14 | 1995-07-26 | 三井石油化学工业株式会社 | Novel transition metal compound, olefin polymerization catalyst component comprising the transition metal compound, olefin polymerization catalyst comprising the olefin polymerization catalyst comp... |
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| CN1105672A (en) * | 1994-11-14 | 1995-07-26 | 三井石油化学工业株式会社 | Novel transition metal compound, olefin polymerization catalyst component comprising the transition metal compound, olefin polymerization catalyst comprising the olefin polymerization catalyst comp... |
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