Patent Publication Number: US-6034027-A

Title: Borabenzene based olefin polymerization catalysts containing a group 3-10 metal

Description:
This is a continuation-in-part application of U.S. patent application Ser. No. 08/651,190, filed May 17, 1996, which is a divisional of U.S. Pat. No. 5,637,659. 
    
    
     BACKGROUND OF THE INVENTION 
     This invention relates to catalysts useful in homo- and co-polymerizing ethylene and other olefinic hydrocarbons. In particular, it relates to catalysts containing a transition metal π-bonded to a ligand that contains a borabenzene ring. Until recently, polyolefins have been primarily made with conventional Ziegler catalyst systems. These catalysts typically consist of transition metal-containing compounds and one or more organometallic compound. For example, polyethylene has been made using Ziegler catalysts such as titanium trichloride and diethylaluminum chloride, or a mixture of titanium tetrachloride, vanadium oxytrichloride, and triethylaluminum. These catalysts are inexpensive but they have low activity and therefore must be used at high concentrations. As a result, it is sometimes necessary to remove catalyst residues from the polymer, which adds to production costs. Neutralizing agents and stabilizers must be added to the polymer to overcome the deleterious effects of the catalyst residues. Failure to remove catalyst residues leads to polymers having a yellow or grey color and poor ultraviolet and long term stability. For example, chloride-containing residues can cause corrosion in polymer processing equipment. Furthermore, Ziegler catalysts produce polymers having a broad molecular weight distribution, which is undesirable for some applications such as injection molding. They are also poor at incorporating α-olefin co-monomers. Poor co-monomer incorporation makes it difficult to control the polymer density. Large quantities of excess co-monomer may be required to achieve a certain density and many higher α-olefins, such as 1-octene, may be incorporated at only very low levels, if at all. 
     Although substantial improvements in Ziegler catalyst systems have occurred since their discovery, these catalysts are now being replaced with the recently discovered metallocene catalyst systems. A metallocene catalyst typically consists of a transition metal compound which has one or more cyclopentadienyl ring ligands. They have low activities when used with organometallic compounds, such as aluminum alkyls, which are used with traditional Ziegler catalysts, but very high activities when used with aluminoxanes as cocatalysts. The activities are generally so high that catalyst residues need not be removed from the polymer. Furthermore, they produce polymers with high molecular weights and narrow molecular weight distributions. They also incorporate α-olefin co-monomers well. However, at higher temperatures metallocene catalysts tend to produce lower molecular weight polymers. Thus, they are useful for gas phase and slurry polymerizations of ethylene, which are conducted at about 80° C. to about 95° C., but they do not generally work well in solution polymerizations of ethylene, at about 150° C. to about 250° C. The polymerization of ethylene in solution is desirable because it allows great flexibility for producing polymers over a wide range of molecular weights and densities as well as the use of a large variety of different co-monomers. One can produce polymers that are useful in many different applications. For example, high molecular weight, high density polyethylene (PE) film useful as a barrier film for food packaging and low density ethylene co-polymers with good toughness and high impact strength. 
     SUMMARY OF THE INVENTION 
     We have found a new class of catalysts based on a borabenzene ring structure and containing a transition metal. The catalysts of this invention have unusually high activities, which means that they can be used in very small quantities. They are also very good at incorporating co-monomers into the polymer. They have good activity at higher temperatures and are therefore expected to be useful in solution polymerizations of ethylene. Finally, some of the catalysts within the scope of this invention contain tertiary amine groups. It is surprising that these catalysts are effective because many amine-containing compounds are known to be catalyst poisons. 
     DESCRIPTION OF THE PREFERRED EMBODIMENTS 
     The catalysts of this invention have the general formula ##STR5## each X is independently selected from hydrogen, halogen, alkoxy from C 1  to C 10 , dialkylamino from C 1  to C 10  or methyl, ##STR6## where &#34;n&#34; is 0 to 5 and preferably is 0; a is 1 to 3; 
     b is 0 to 2; 
     a+b≦3; 
     c is 1 to 6; and 
     a+b+c equals the oxidation state of M. 
     The X group in the formula above is preferably chlorine or methyl, as those catalysts are easy to prepare and have good properties. 
     In the formula, Q is a ligand containing a borabenzene ring. A borabenzene ring has the structure ##STR7## wherein R&#39; is independently selected from hydride or R; 
     two adjacent R&#39; groups may be joined to form a C 4  -C 10  ring; 
     R is a C 1  to C 20 , preferably a C 1  to C 6 , aliphatic or cycloaliphatic radical; a C 6  -C 30 , preferably a C 6  -C 15 , aryl radical, or a C 7  -C 30 , preferably a C 7  -C 15 , aralkyl or alkaryl radical; 
     R 5  is R&#39;, --Si(R) 3 , --M 2  (R), --M 3  (R) 2  ; 
     --M 2  is a Group 16 element; 
     --M 3  is a Group 15 element; and 
     M is a Group 3-10 metal, preferably a Group 3 or Group 5-7 metal, most preferably a Group 4-6 metal. 
     The R 5  group is preferably --N(R) 2 , --P(R) 2 , C 1  to C 6  alkyl, or C 6  to C 10  aryl or C 6  to C 12  alkaryl, as those catalysts have the best properties and, if R 5  is --N(R) 2 , then the R in --N(R) 2  is preferably a C 1  to C 4  alkyl. Examples of Q ligands include those wherein R 5  is independently selected from hydride or a C 1  to C 20  aliphatic or cycloaliphatic radical (borabenzene); ##STR8## where R&#39; is preferably hydrogen. 
     Also, L in the general formula can be ##STR9## Q, or X wherein R 1  is independently selected from halogen, alkoxy from C 1  to C 10  and R&#39;. Preferably, L is Q, cyclopentadienyl, or chlorine because those catalysts are easiest to prepare and have good properties. 
     Optionally, one ligand can be bridged to another ligand. For instance, a L group can be bridged to a Q group, a Q group can be bridged to a second Q group or a L group can be bridged to a second L group. Bridging groups that can be used to bridge two ligands include methylene, ethylene, 1,2-phenylene, a dialkyl silyl, diaryl silyl or an alkyl/aryl silyl such as dimethyl silyl, diphenyl silyl, diethyl silyl, and methyl phenyl silyl. Normally, only a single bridge is used in a catalyst. It is believed that bridging the ligand changes the geometry around the catalytically active transition metal and improves catalyst activity and other properties, such as comonomer incorporation and thermal stability. 
     A preferred bridged compound is one wherein the bridging group links Q and L. Such compounds are of the formula: ##STR10## wherein G is the bridging group as previously defined and Q, L, M and X are as previously defined. 
     Since the bridged compound is neutral, it is necessary to remove a hydrogen atom or a functional group of L in order to provide the spatial arrangement for the formation of the bridge. For instance, L may be a monoalkylamino but not a dialkylamino. Likewise when L is of the formula ##STR11## or boraanthracene one of the R 1  or R&#39; groups, respectively, is removed. 
     Non-limiting examples of preferred bridged compounds are 
     (I) dimethylsilyl(9-mesitylboraanthracenyl) (t-butylamido) zirconium dichloride; ##STR12## (II) dimethylsilyl (2-tert-butylboranaphthyl) (t-butylamido) zirconium dichloride; ##STR13## (III) dimethyl silyl (9-tert-butyl boraanthracenyl) (cyclopentadienyl) zirconium dichloride; and ##STR14## (IV) methylene bis(9-methylboraanthracenyl) zirconium dichloride. ##STR15## 
     Other preferred bridged compounds include those with titanium in place of zirconium. 
     In the general formula, B is an optional Lewis base. Up to an equimolar amount (with M) of base can be used. The use of a Lewis base is generally not preferred because it tends to decrease catalyst activity. However, it also tends to improve catalyst stability, so its inclusion may be desirable depending upon the process in which it is being used. The base can be residual solvent from the preparation of the catalyst, or it can be added separately in order to enhance properties of the catalyst. Examples of bases that can be used in this invention include ethers such as diethyl ether, dibutyl ether, tetrahydrofuran, and 1,2-dimethoxyethane, esters such as n-butyl phthalate, ethyl benzoate, and ethyl p-anisate, and phosphines such as triethylphosphine, tributylphosphine, and triphenylphosphine. 
     Preparation of the Q ligand portion of the catalyst can be found in the literature. See, for example, &#34;Borabenzene Derivatives 21. 2,4-Pentadienylboranes as Key Intermediates of a Novel Route to Boracyclohexadienes and Boratabenzenes. Structure of [Li(TMEDA)](C 5  H 5  BNMe 2 )&#34; by Gerhard E. Herberich et al., Organometallics (1993), pages 2891-2893, herein incorporated by reference. In that article, 2,4-pentadienylborane is reacted with a lithium amide in tetrahydrofuran in the presence of tetramethylethylenediamine (TMEDA) to form a dimethylamino borabenzenyl lithium TMEDA complex having the formula ##STR16## See also, &#34;Reactions of the 9-Mesityl-9-boraanthracene Anion&#34; by R. Van Veen and F. Bickelhaupt, Journal of Organometallic Chemistry, (1974), pages 153-165, which describes the formation of 9-mesityl-9-boraanthracenyllithium. ##STR17## Other Q ligands can be prepared in an analogous manner or by other processes. The catalyst can be made from the Q ligand by adding a suspension of the appropriate metal compound to a solution of the Q ligand. This reaction can occur at about -78 to about 50° C., but is preferably performed below 0° C. 
     Since the catalyst is normally used in conjunction with an organometallic co-catalyst, it is preferable to dissolve the catalyst in a solvent in which the co-catalyst is also soluble. For example, if methylaluminoxane (MAO) or polymethylaluminoxane (PMAO) is the co-catalyst then toluene, xylene, benzene, or ethylbenzene could be used as the solvent. Other suitable co-catalysts include aluminum alkyls having the formula AIR&#39; x  (R 2 ) 3-x , where 1≦×≦3 and R 2  is hydrogen, halide, or alkyl or alkoxide from C 1  to C 20 , such as triethylaluminum and ethylaluminum dichloride. The preferred co-catalyst is MAO as it results in high activity and a polymer having a narrower molecular weight distribution. The mole ratio of the organometallic cocatalyst to catalyst when used in a polymerization is generally in the range 0.01:1 to 100,000:1, and preferably ranges from 1:1 to 10,000:1. 
     To enhance its properties, the catalyst can be used with an acid salt that contains a non-coordinating inert anion (see U.S. Pat. No. 5,064,802). The acid salt is generally a non-nucleophilic compound that consists of bulky ligands attached to a boron or aluminum atom, such as lithium tetrakis (pentafluorophenyl) borate, lithium tetrakis(pentafluorophenyl)- aluminate, anilinium tetrakis(pentafluorophenyl)borate, and mixtures thereof. The anion which results when these compounds react with the catalyst is believed to be weakly coordinated to the metal-containing cation. The mole ratio of acid salt to catalyst can range from about 0.01:1 to about 1000:1, but is preferably about 1:1 to 10:1. While there is no limitation on the method of preparing an active catalyst system from the catalyst and the acid salt, preferably they are mixed in an inert solvent at temperatures in the range of about -78° C. to about 150° C. They can also be mixed in the presence of monomer if desired. The acid salt can be used in combination with the organometallic cocatalysts described earlier. 
     The catalyst and co-catalyst can be used on a support such as silica gel, alumina, silica, magnesia, or titania, but supports are not preferred as they may leave contaminants in the polymer. However, a support may be required depending upon the process being utilized. For example, a support is generally needed in gas phase polymerization processes and slurry polymerization processes in order to control the particle size of the polymer being produced and in order to prevent fouling of the reactor walls. In order to use a support, the catalyst and co-catalyst are dissolved in the solvent and are precipitated onto the support material by, for example, the evaporation of solvent. The co-catalyst can also be deposited on the support or it can be introduced into the reactor separately from the supported catalyst. 
     Once the catalyst has been prepared it should be used as promptly as possible as it may lose some activity during storage. Storage of the catalyst should be at a low temperature, such as -100 to about 20° C. The catalyst is used in a conventional manner in the polymerization of olefinic hydrocarbon monomers. While unsaturated monomers such as styrene can be polymerized using the catalysts of this invention, it is particularly useful for polymerizing α-olefins such as propylene, 1-butylene, 1-hexene, 1-octene, and especially ethylene. 
     The catalyst is also useful for copolymerizing mixtures of ethylene with unsaturated monomers such as 1-butene, 1-hexene, 1-octene, and the like; mixtures of ethylene and di-olefins such as 1,3-butadiene, 1,4-hexadiene, 1,5-hexadiene, and the like; and mixtures of ethylene and unsaturated comonomers such as norbornene, ethylidene norbornene, vinyl norbornene, and the like. 
     The catalysts of this invention can be utilized in a variety of different polymerization processes. They can be utilized in a liquid phase polymerization process (slurry, solution, suspension, bulk phase, or a combination of these), in a high pressure fluid phase, or in a gas phase polymerization process. The processes can be used in series or as individual single processes. The pressure in the polymerization reaction zones can range from about 15 psia to about 50,000 psia and the temperature can range from about -100° C. to about 300° C. The catalyst can be used in a conventional manner in the co-polymerization of olefin monomers such as ethylene, propylene, 1-butene, 1-octene, 1-hexene, norbornene, and norbornadiene. 
    
    
     The following examples further illustrate this invention. 
     EXAMPLE 1 
     This example describes the synthesis of (B-dimethylamino-borabenzene) cyclopentadienylzirconium dichloride, which has the formula ##STR18## where Cp is cyclopentadienyl and Me is methyl. 
     To a suspension of 0.56 grams (2.13 mmole) of cyclopentadienylzirconium trichloride (purchased from Strem Chemicals) in 15 ml of absolute ether, a solution of 0.61 g (2.51 mmole) of dimethylamino borabenzenyl lithium tetramethylethylenediamine complex, (prepared according to the hereinabove cited article by G. E. Herberich) in 10 ml of ether was added at -78° C. The mixture was warmed to room temperature and was stirred for an additional 1 hour. After the volatiles had been removed in vacuo, the residue was washed with 30 ml of hexane and extracted with 30 ml of toluene. The toluene was evaporated under reduced pressure to give 0.23 grams of a black solid. Proton NMR spectrum indicated the presence of some impurities in the product. 
     EXAMPLE 2 
     This example describes the synthesis of cyclopentadienyl(9-mesitylboraanthracenyl)zirconium dichloride, which has the formula ##STR19## 
     A solution of 9-mesitylboraanthracenyllithium in diethyl ether was prepared by adding 1.0 mL of 1.6 M n-butyllithium in hexanes to a solution of 0.47 g (1.6 mmol) of 9-mesitylboraanthracene in 18 mL diethyl ether at -78° C., warming to room temperature, and stirring for an additional 2 hours. The solution was cooled to -10° C. and 0.42 g (1.6 mmol) of cyclopentadienylzirconium trichloride (Strem Chemicals) was added. The bath was then allowed to reach room temperature, and the reaction mixture was stirred overnight. The volatiles were removed in vacuo to give a reddish brown powder. To this was added 20 mL dry toluene and the mixture was filtered to give a clear yellow-orange filtrate which was concentrated to give a brown foam. This was treated with dry hexane (20 mL) and the mixture filtered to give 0.26 g of a light tan solid. Proton NMR spectrum of the product indicated the presence of some impurities. 
     EXAMPLES 3 to 17 
     Ethylene was polymerized using the catalysts of Examples 1 and 2. (Examples 3 through 13 and Example 20 used the catalyst prepared in Example 1 and Examples 14 through 19 used the catalyst prepared in Example 2.) The polymerizations were conducted in a stirred 1.7 liter autoclave at 80 or 110° C. Dry, oxygen-free toluene (840 ml) was charged to a clean, dry, oxygen-free reactor. MAO from Ethyl Corporation (10 wt % in toluene) was used in some of the polymerizations. Other polymerizations were conducted using PMAO from Akzo Chemical (25 wt % in toluene). The desired amount of MAO or PMAO to give the ratio shown in the table which follows was added by syringe at 30° C. The reactor was heated to the desired temperature and sufficient ethylene was added to bring the reactor pressure to 150 psig. The reactor was allowed to equilibrate at the desired temperature and pressure. A solution of catalyst was prepared by dissolving 0.100 grams of product in 100 ml of toluene. The amount of this solution needed to give the amount of catalyst shown in the table was used to start a polymerization. Ethylene flowed into the reactor as needed in order to keep the pressure constant at 150 psig as polymer was produced. 
     At the end of 1 hour (less, if the activity was very high) the ethylene flow was stopped and the reactor was rapidly cooled to room temperature. The reactor was opened and the polymer was filtered from the toluene. The product was dried overnight in a vacuum oven and weighed. The following tables give the reaction conditions and the results of polymerizations. 
     
         __________________________________________________________________________
   Reactor           Co-                Cat                               
   Rx          Co-   mono-    Al/Zr  Wt.                                  
                                        Prod                              
                                           MI2                            
   Temp                                                                   
       Time                                                               
          H2 Amt                                                          
               mono- mer Catalyst                                         
                              (Ato-                                       
                                 Co- PE (kg/                              
                                           (dg/                           
                                              MI20     Density            
Ex.                                                                       
   (° C.)                                                          
       (min)                                                              
          (mmoles)                                                        
               mer   (ml)                                                 
                         (mmoles)                                         
                              mic)                                        
                                 catalyst                                 
                                     (g)                                  
                                        g/hr)                             
                                           min)                           
                                              (dg/min)                    
                                                   MFR (g/ml)             
                                                           Mw/Mn          
__________________________________________________________________________
3  80  60 0    None  0   9.00E-03                                         
                              1430                                        
                                 PMAO                                     
                                     77.1                                 
                                        93.9                              
                                           0.17                           
                                              2.37 13.9                   
                                                       0.9574             
                                                           2.00           
4  80  60 0    None  0   4.50E-03                                         
                              2870                                        
                                 PMAO                                     
                                     81.3                                 
                                        198.1                             
                                           0.14                           
                                              2.57 18.0                   
                                                       0.9587             
                                                           1.75           
5  80  60 180  None  0   4.50E-03                                         
                              2870                                        
                                 PMAO                                     
                                     92.5                                 
                                        225.4                             
                                           10.28                          
                                              333  32.4                   
                                                       0.9720             
                                                           --             
6  80  60 0    Butene-1                                                   
                     20  4.50E-03                                         
                              2870                                        
                                 PMAO                                     
                                     71.7                                 
                                        174.7                             
                                           1.11                           
                                              24.92                       
                                                   22.5                   
                                                       0.9323             
                                                           --             
7  110 60 0    None  0   4.50E-03                                         
                              2870                                        
                                 PMAO                                     
                                     70.4                                 
                                        171.5                             
                                           1.10                           
                                              22.64                       
                                                   20.6                   
                                                       0.9616             
                                                           1.70           
8  110 60 0    None  0   4.50E-03                                         
                              2870                                        
                                 MAO 80.1                                 
                                        195.2                             
                                           1.50                           
                                              35.81                       
                                                   23.9                   
                                                       0.9637             
                                                           1.84           
9  110 30 30   None  0   4.50E-03                                         
                              2870                                        
                                 MAO 105.0                                
                                        511.7                             
                                           18.40                          
                                              539  29.3                   
                                                       0.9714             
                                                           4.194          
10 110 60 0    Butene-1                                                   
                     20  4.50E-03                                         
                              2870                                        
                                 MAO 96.5                                 
                                        235.1                             
                                           7.92                           
                                              152  19.2                   
                                                       0.9448             
                                                           --             
11 110 60 90   Butene-1                                                   
                     20  4.50E-03                                         
                              2870                                        
                                 MAO 110.0                                
                                        536.1                             
                                           41.94                          
                                              1202 28.7                   
                                                       0.9521             
                                                           --             
12 110 30 90   Hexene-1                                                   
                     20  4.50E-03                                         
                              2870                                        
                                 MAO 138.9                                
                                        676.9                             
                                           16.27                          
                                              588  36.1                   
                                                       0.9584             
                                                           4.85           
13 110 60 0    Octene-1                                                   
                     20  4.50E-03                                         
                              2870                                        
                                 MAO 65.0                                 
                                        158.4                             
                                           9.29                           
                                              185  19.9                   
                                                       0.9515             
                                                           --             
14 80  30 30   Butene-1                                                   
                     17  4.79E-03                                         
                              1570                                        
                                 MAO 31.8                                 
                                        145.7                             
                                           549                            
                                              --   --  --  --             
15 80  15 30   Butene-1                                                   
                     17  4.79E-03                                         
                              1570                                        
                                 MAO 34.5                                 
                                        316.1                             
                                           &lt;0.01                          
                                              2.89 --  --  --             
16 80  30 30   Butene-1                                                   
                     17  4.79E-03                                         
                              1570                                        
                                 MAO 44.5                                 
                                        203.8                             
                                           106                            
                                              --   --  --  --             
17 80  30 30   Butene-1                                                   
                     17  4.79E-03                                         
                              2190                                        
                                 MAO 83.6                                 
                                        383.0                             
                                           25.8                           
                                              588  22.8                   
                                                       --  --             
18 110 10 0    Butene-1                                                   
                     17  4.79E-03                                         
                              2190                                        
                                 MAO 66.1                                 
                                        908.4                             
                                           &lt;0.01                          
                                              49.1 --  --  --             
19 110 30 0    Butene-1                                                   
                     17  2.87E-03                                         
                              2190                                        
                                 MAO 33.2                                 
                                        253.5                             
                                           &lt;0.01                          
                                              31.9 --  --  --             
20 80  60 0    5-vinyl-2-                                                 
                     30  3.00E-03                                         
                              4500                                        
                                 MAO 49.1                                 
                                        179.4                             
                                           0.07                           
                                              1.18 17.1                   
                                                       0.9415             
                                                           --             
               norbornene                                                 
__________________________________________________________________________
 
    
     The melt index of the polymer was measured according to ASTM D-1238, Condition E and Condition F. M12 is the melt index measured with a 2.16 kg weight (Condition E). M120 is the melt index measured with a 21.6 kg weight (Condition F). MFR is the ratio of M120 to M12. The polymer density was measured according to ASTM D-1505. The molecular weight distribution of the polymer was measured using a Waters 150C gel permeation chromatograph at 135° C. with 1,2,4-trichlorobenzene as the solvent. Both weight average molecular weight (M w ) and ratio of M w  to M n  (number average molecular weight) are used to characterize the molecular weight distribution. The table shows a high activity at 80° C. and little or no decline in activity at 110° C. (Examples 9 vs. 2). 
     The catalyst has excellent comonomer incorporation properties. Note the unusually high butene-1 incorporation in Examples 6 and 10 which produced relatively low polymer densities. In addition, the catalyst readily incorporates comonomers which are usually difficult to copolymerize. This is exemplified by the copolymerization of ethylene and 5-vinyl-2-norbornene in Example 20. In Example 3, the ratio of the weight average molecular weight to the number average molecular weight, which is an indication of the molecular weight distribution, was measured as 2.00. An Mw/Mn of 2.00 indicates a very narrow molecular weight distribution. 
     EXAMPLE 18 
     This example describes the synthesis of (B-dimethylamino-borabenzene) cyclopentadienylplatinum dichloride, which has the formula ##STR20## where Cp is cyclopentadienyl and Me is methyl. 
     To a suspension of 0.010 moles of cyclopentadienylplatinum trichloride in 15 mL of ether, a solution of 0.010 moles of dimethylamino borabenzenyl lithium tetramethylethylenediamine complex, (prepared according to the hereinabove cited article by G. E. Herberich) in 50 mL of ether is added at -78° C. The mixture is warmed to room temperature and is stirred for an additional 1 hour. After removal of the volatiles in vacuo, the residue is washed with 30 ml of hexane and is extracted with 30 ml of toluene. The product is recovered by evaporating the toluene under reduced pressure. An α-olefin polymer may be produced according to the procedure described in Example 3-17. 
     EXAMPLE 19 
     This example describes the synthesis of bis(1-methylborabenzene) tungsten tetrachloride, which has the formula ##STR21## 
     A solution of 0.010 moles of (1-methylborabenzene)lithium complex (prepared according to the above cited article by G. E. Herberich) in 20 mL diethyl ether is added to 0.005 mmoles of tungsten hexachloride in 50 mL ether at -78° C. The bath is then allowed to reach room temperature, and the reaction mixture is stirred overnight. The volatiles are removed in vacuo. To this is added 50 mL dry toluene and stirred for 1 hour to extract the product. The mixture is filtered. The filtrate is then evaporated under vacuum to recover the solid product. The catalyst may be used to produce a polyolefin as described in Examples 3 to 17. 
     EXAMPLE 20 
     This example describes the synthesis of (cyclopentadienyl)9-mesitylboraanthracenyl)niobium trichloride, which has the formula ##STR22## 
     A solution of 9-mesitylboraanthracenyllithium in diethyl ether is prepared as described in Example 2. A solution containing 0.01 moles of 9-mesitylboraanthracenyl lithium in 20 mL ether is added dropwise to a solution of 0.01 moles of cyclopentadienylniobium tetrachloride at -78° C. The sample is then allowed to warm to room temperature and the reaction mixture is stirred overnight. The volatiles are removed in vacuo. To this is added 20 mL dry toluene and the mixture is filtered. The product is recovered by evaporating the toluene under vacuum. The catalyst may be used to produce a polyolefin as described in Examples 3 to 17. 
     EXAMPLE 21 
     This example describes the preparation of the bridged boraanthracene compound dimethylsilyl (9-mesitylboraanthracenyl) (t-butyl amido) zirconium dichloride. A solution of 9-mesitylboraanthracenyl lithium in ether is prepared as described in Example 2. A solution containing 0.01 moles of 9-mesitylboraanthracenyl lithium in 100 mL ether is added dropwise to a solution of 0.01 moles of dimethyidichlorosilane in 20 mL ether at -78° C. The mixture is stirred, then warmed to room temperature and stirred for 1 hour. The mixture is filtered and the solvent and unreacted dimethyldichlorosilane removed under vacuum. The residue is dissolved in 50 mL ether and cooled to 0° C. A solution of 0.01 moles of t-butylamine and 0.01 moles triethylamine in 50 mL ether is added while stirring. The mixture is allowed to warm to room temperature and is stirred for 1 hour. The solids are then removed by filtration and the product recovered by evaporating the solvent under vacuum. The residue is purified by crystallization at 0° C. from a mixrture of ether and pentane. 
     The purified dimethylsilyl (9-mesityl-9, 10-dihydroboraanthracene) (t-butylamine) is then reacted with butyl lithium--TMEDA complex. A solution of 0.01 moles of purified boraanthracene in 50 mL ether is added to a mix of 0.02 moles of n-butyl lithium and 0.02 moles of TMEDA in 50 mL hexane at -78° C. This is stirred for 1 hour at -78° C., then warmed to room temperature where it is stirred an additional hour. The mixture is added to a suspension of 0.005 moles of zirconium tetrachloride in 20 mLs of ether at -78° C. This is stirred 1 hour, then allowed to reach room temperature and is stirred overnight. The mixture is filtered and the solvents removed under vacuum. The product is exracted from the residue with toluene and the solid catalyst recovered from the toluene solution. An olefin polymer may be prepared from the catalyst according to the methods described in Examples 3-17.