CA2210496C

CA2210496C - Borabenzene based olefin polymerization catalysts

Info

Publication number: CA2210496C
Application number: CA002210496A
Authority: CA
Inventors: Ramesh Krishnamurti; Sandor Nagy; Bradley P. Etherton
Original assignee: Equistar Chemicals LP
Current assignee: Equistar Chemicals LP
Priority date: 1995-01-17
Filing date: 1995-12-20
Publication date: 2005-09-13
Anticipated expiration: 2015-12-20
Also published as: AU4524396A; EP0804490A2; US5637659A; ES2126336T3; FI973710A0; CA2210496A1; AU692985B2; WO1996023004A2; US5554775A; DE69503070T2; FI973710A; BR9510293A; KR19980702204A; CN1118479C; JPH11501339A; DE69503070D1; FI119735B; EP0804490B1; CN1190407A; WO1996023004A3

Abstract

Disclosed is a catalyst having general formula (I), where Q is a ligand containing the ring (II), R is hydrogen, N(R')2, OR', or R', each R' is independently selected from alkyl from C1 to C10, aryl from C6 to C15, alkaryl C7 to C15, and aralkyl from C7 to C15, each X is independently selected from hydrogen, halogen, alkoxy from C1 to C10, dialkylamino from C1 to C10, methyl, (III), each R1 is independently selected from halogen, alkoxy from C1 to C10, and R', L is (IV), (V), (VI), (VII), (VIII), Q, or X, where L can be bridged to Q, B is an optional base, "n" is 0 to 5, and M is titanium, zirconium, or hafnium.

Description

BORABENZENE BASED OLEFIN POLYMERIZATION CATALYSTS
~

Backaround 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 r-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 diethyl.aluminum 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 SUBSTITUTE SHEET (RULE 26) 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 c-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 c-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 atransition 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 a-olefin co--monomers well. However, at higher temperatures metallocene catalysts tend to produce lower molecular weight polymers. Thus, they are useful for SUBSTITUTE SHEET (RULE 26) 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 bora-benzene 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.

SUBSTITUTE SHEET (RULE 26) QgicriDt on of the Preferred Embod?ments Ths catalysts of thims invention have the general formula X
I
S Q- N - L = B
I
X

In the formula, Q is a ligand containing a bora-benzene ring. A bora-benzene ring has the structure R
where R can be hydrogen, N(R' ) z, OR' , or R' , where each R' is independently selected from alkyl from C, to C,o, aryl from C.
to C,s, alkaryl from C., to C. and aralkyl from C, to C,s. The R group is preferably -N(R')2 or phenyl, as those catalysts have the best properties and, if R is -N(R')z, then the R' in -N(R')z is preferably methyl. Examples of Q ligands include [ehr(Rm R1 ~ W-.(RI)MI

R
(bora-benzene) (bora-naphthalene) (bora-naphthalene) ..... . .

0 lR~~m7 O

R
(bora-anthracene) (bora-phenanthrene) where "m" is an integer from 0 to the maximum number of substitutable positions, and is preferably 0 as those catalysts are easier to make. Each R, is independently selected from halogen, alkoxy from C, to C,o, and R' . The preferred Q ligands are bora-benzene, bora-naphthalene, and bora-anthracene because those catalysts are easier to prepare .
In the general formula, each X is independently selected from hydrogen, halogen, alkoxy from C, to C,o, dialkylamino from C, to C,o, methyl, (RI )n j ond -CH2 (RI)n where "n" is an integer from 0 to 5 inclusive and preferably is 0. The X group is preferably chlorine or methyl, as those catalysts are easy to prepare and have good properties.
Also, L in the general formula can be 7~-qn W: )- (qn C 0 ) v R R R 4 Q (Rf~n a O (Rl~n c g R
Q, or X. Preferably, L is Q, cyclopentadienyl, or chlorine because those catalysts are easiest to prepare and have good properties.

Optionally, L can be bridged to Q. Groups that can be used to bridge two ligands include methylene, ethylene, 1,2-phenylene, 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.

The M group in the general formula can be titanium, zirconium, or hafnium, but is preferably zirconium as those catalysts have a good combination of high activity and good stability.

SUBSTITUTE SHEET (RULE 26) In the general formula, B is an opt:onal lmsr~s base. Up to an equimolar amount (vith M) of base can be used. The rse of a Lewis base is generally not preferre: because it :.ends to decrease catalyst activity. However, it also ze=!s to 3.mpr=;je catalyst stability, so its inelusior. may be desirLle depending upon the process in which it is bein, used. =Ie base can be residual solvent from the prepart--ion of the catalyst, or it can be added separately in rrde: to enhance properties of the catalyst. Examples c: bases :hat can be used in this invention include ethers su.zb as diethyl et*.e:, "clibutyl ether, tetrahydrofuran, and 1,2-dime-;.oxyetha:.e, esters such as n-butyl phthalate, ethyl beazoaze, and ethyl p-anisate, and phosphines such as trieth_r:phosph3=e, tributylphosphine, and triphenylphosphine.

According to an aspect of the present invention there is provided .A catalyst havinq,the genesal formuia HHI B
where Q is oo or g I
R R
each X is independently selected lroa the group consisting ot chlorine and methyl, L is Q, C
R
or chlorine, R is -N(ClL3)2 , or alkyl substituted phenyl from C. to C,s, and H is an op:ional Levis base.

According to an aspect of the present invention there is provided A catalyst having the general formula Cl .~
Q' Zr Cp e~ -where Cp is cyclopentadienyl. Q is o, o; a o,or o~,o e a g 8 R R R
R
and R is -N(CH,)a or alkyl substituted phenyl lram Cr to Cis.

Preparation of the Q ligand portion cf t!3e catalyst mn be found in the literature. See, for essnple, "'_ora:enzeae Derivatives 21. 2,4-Pentadienylboranes as +ey Imte=ediates cf a Novel Route to Boracyclohexadienes and 3orat-abenzenes.
Structure of [Li(TMEDA) ](CHsBNMe,)" by Ge =ard E. Eer.berich et al., Orcanometallics (1993), pages 289I-2893, In that art:.r.le, 2,4-pentadienylborane is reacted vith a litbium amide :.n tetrahydrofuran in the presence of tetramenylet-hylenediamine (TMEDA) to form a dimethylamino borabenzenyl li-rium T!MA
complex having the formula -7a-~C H3 (CH3)2N(CHZ)2N(CH3)2- Li -- O H -N\

See also, "Reactions of the 9-Mesityl-9-boraanthracene Anion"
by R. Van Veen and F. Bickelhaupt, Journal of Organometallic Chemistry, (1974), pages 153-165, which describes the formation of 9-mesityl-9-boraanthracenyllithium.

Li @V: ) Me Me Me 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 an appropriate tetravalent 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 SUBSTITUTE SHEET (RULE 26) soluble. For example, if inethylaluminoxane (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 A1R',(R2) 3.x, where 15 x<-3 and R2 is hydrogen, halide, or alkyl or alkoxide from C, to C201 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. Patent 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(penta-fluorophenyl) 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 SUBSTITUTE SHEET (RULE 26) 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 SUBSTITUTE SHEET (RULE 26) styrene can be polymerized using the catalysts of this invention, it is particularly useful for polymerizing a-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.

SUBSTITUTE SHEET (RULE 26) Example 1 This example describes the synthesis of (B-dimethylamino-borabenzene) cyclopentadienylzirconium dichloride, which has = R
the formula Cp 1-Zr -CI
B ( I CI
N
Me-'~ ""Me where Cp is cyclopentadienyl and Me is methyl.

To a suspension of 0.56 grams (2.13 mmole) of cyclopentadienyizirconium 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.

SUBSTITUTE SHEET (RULE 26) Example 2 This example describes the synthesis of cyclopentadienyl(9-mesitylboraanthracenyl)zirconium dichloride, which has the formula CP
I
CI-Zr-CI

M 0Me Me 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 tmperature, 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 ws filtered to give a clear yellow-orange filtrate which was concentrated to give a brown foam. This was treated with dry hexane (20 mL) SUBSTITUTE SHEET (RULE 26) and the mixture filtered to give 0.26 g of a light tan solid.
Proton NNgt 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 wtt 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.

SUBSTITUTE SHEET (RULE 26) 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 v 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.

J

SUBSTITUTE SHEET (RULE 26) ~`~ o 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 ~
~q ¾ ¾ ¾ ¾ ¾ ¾ ¾ ¾ ¾ ¾ ¾ ¾

eu =
Ni O O O O O O O O O O O O O O O O O O
~ E M h f~ f~ l~ 1~ f~ 1` t~ f~ t~ f~ f~ f~ Qf Of O O
"O !t CO CO GO CO GO CO CO CO CO CO !n 1ff ln r r r Q a N
r N N N N N N N N N N r r r N N V
O
++ N) l') C) ~") !7 F) t~) ~') E) !") ~) l') ~') @) !') t7 !7 ~) y ~1 O O O O O O O O O O O O O O O O O O
>%Q!
.-14 W W W W W W W W W W W W W W W W W W
lE O 0 0 0 0 0 0 0 0 0 0 0 0 O) O) O) Q) N. O
++ Ã O Y') 1[) Mf tc) t1) tt) 0 tC) 11) t[) tl- 1l- N 1- t- OD 0 . . . . . . . . . . . . . . . . . .
c4 E

d O
_'-4 O O O O O O O O 0 O 0 N. N N f- N N O
O E N N N N N r - r - r - O

U

~ d d r - - - r r - r r - - N C
e 1 1 I 1 1 1 I I 1 1 1 1 Q) O C~ Cl Ol 01 Gl C1 Q~ C! G1 G! d Ci G! 01 O1 C! Oi .-i C
C C C C C C C C C C C C C C C O C C >. L
O O 0 0 0 0 0 0 01 C) OJ G! G) C) G) 0 d d = O
E Z Z Z ++ Z Z Z '+J ++ X +J ++ ++ ++ ++ ++ +J -4.0 i 7 7 3 0 O O 7 > > O O > L.
U m CO m S O C] oD CO cD 00 O] t[~ 0 i-J N
E d O
Q O O CO O O O 0 O ~ 0 0 0 O O O
CV E
= E

E,,Oj O O O O O 0 0 O 0 0 O 0 u) 0 0 0 O 0 A (G (D 40 tC t0 CG P) tG (D M tO M r M M - cn tD
L G.
O E
++ C, O O O O O O O O
~~ o CO OD CO CO r r r r r r- r CO CD 00 CO ~ r O~p ¾s x C'~ !t tA ~D f~ CO O) O r N f'~ tn ~O h CO Q1 0 W r r r r r r r r r r N

SUBSTITUTE SHEET (RULE 26) irl Wt. PE Cat Prod M12 AII20 Density Ex. (g) (kg/ /hr) (d /ain) (dg/min) MFR (g/ml) Mw/Mn 3 77.1 93.9 0.17 2.37 13.9 0.9574 2.00 4 81.3 198.1 0.14 2.57 18.0 0.9587 1.75 92.5 225.4 10.28 333 32.4 0.9720 -5 6 71.7 174.7 1.11 24.92 22.5 0.9323 7 70.4 171.5 1.10 22.64 20.6 0.9616 1.70 8 80.1 195.2 1.50 35.81 23.9 0.9637 1.84 9 105.0 511.7 18.40 539 29.3 0.9714 4.194 96.5 235.1 7.92 152 19.2 0.9448 -10 11 110.0 536.1 41.94 1202 28.7 0.9521 -12 138.9 676.9 16.27 588 36.1 0.9584 4.85 13 65.0 158.4 9.29 185 19.9 0.9515 -14 31.8 145.7 549 - - -34.5 316.1 <0.01 2.89 - - -15 16 44.5 203.8 106 - - - -17 83.6 383.0 25.8 588 22.8 - -18 66.1 908.4 <0.01 49.1 - - -19 33.2 253.5 <0.01 31.9 - - -49.1 179.4 0.07 1.18 17.1 0.9415 -20 The melt index of the polymer was measured according to ASTM

D-1238, Condition E and Condition F. MI2 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 MI20 to MI2. 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 SUBSTITUTE SHEET (RULE 26) chromatograph at 135 C with 1,2,4-trichlorobenzene as the solvent. Both weight average molecular weight (Mw) and ratio of M,w to Mn (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.

SUBSTITUTE SHEET (RULE 26)

Claims

WE CLAIM:

1. A catalyst having the general formula where Q is a ligand containing the ring R is selected from the group consisting of hydrogen, N(R' )2, OR', and R', each R' is independently selected from the group consisting of alkyl from C1 to C10, aryl from C6 to C15, alkaryl from C7 to C15, and aralkyl from C7 to C15, each X is independently selected from the group consisting of hydrogen, halogen, alkoxy from C1 to C10, dialkylamino from C1 to C10, methyl, each R1 is independently selected from the group consisting of halogen, alkoxy from C1 to C10, and R' , L is selected from the group consisting of Q, and X, where L can be bridged to Q, B is an optional Lewis base, "n" is an integer from 0 to 5 inclusive and M is selected from the group consisting of titanium, zirconium, and hafnium.

2. A catalyst according to Claim 1 wherein M is zirconium.

3. A catalyst according to Claim 1 wherein each X is chlorine.

4. A catalyst according to Claim 1 wherein each X is methyl.

5. A catalyst according to Claim 1 wherein L is cyclopentadienyl.

6. A catalyst according to Claim 1 wherein L is chlorine.

7. A catalyst according to Claim 1 wherein Q is and R is -N(R')2 or phenyl.

8. A catalyst according to Claim 7 wherein Q is

9. A catalyst according to Claim 1 wherein Q is where "m" is an integer from 0 to 7 inclusive.

10. A catalyst according to Claim 1 wherein Q is where "m" is an integer from 0 to 9 inclusive.

11. A catalyst according to Claim 1 in combination with about 0.01 to about 100,000 moles of an organometallic cocatalyst per mole of said catalyst.

12. A catalyst according to Claim 11 wherein said organometallic cocatalyst is methylaluminoxane or polymethylaluminoxane.

13. A catalyst according to Claim 1 in combination with about 0.01 to about 1000 moles per mole of said catalyst of an acid salt that contains a non-coordinating inert anion.

14. A catalyst according to Claim 13 wherein said acid salt is selected from the group consisting of lithium tetrakis(pentafluorophenyl)borate, lithium tetrakis(pentafluorophenyl) aluminate, anilinium tetrakis(pentafluorophenyl)borate, and mixtures thereof.

15. A method of polymerizing an .alpha.-olefin comprising heating said .alpha.-olefin in the presence of the catalyst according to Claim 1.

16. A catalyst having the general formula where Q is each X is independently selected from the group consisting of chlorine and methyl, L is Q, or chlorine, R is -N(CH3)2 or alkyl substituted phenyl from C7 to C15, and B is an optional Lewis base.

17. A catalyst having the general formula where Cp is cyclopentadienyl, Q is and R is -N(CH3)2 or alkyl substituted phenyl from C7 to C15.

18. A catalyst according to Claim 17 wherein R is -N(CH3)2.

19. A catalyst according to Claim 17 wherein R is trimethyl phenyl.

20. A catalyst according to Claim 17 which comprises B-dimethylamino-borabenzene cyclopentadienylzirconium dichloride.

21. A catalyst according to Claim 17 which comprises cyclopentadienyl(9-mesitylboraanthracenyl)zirconium dichloride.