Catalyst systems for the polymerization of C.sub.2 -C.sub.10 -al

Details Catalyst systems for the polymerization of C.sub.2 -C.sub.10 -al Catalyst systems for the polymerization of C.sub.2 -C.sub.10 -al

1994-08-03

1995-10-10

Smith, Edward J.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Polymers from only ethylenic monomers or processes of...

502125, 526133, 526351, C08F 4609, C08F 1000

Patent

active

054571715

DESCRIPTION:

BRIEF SUMMARY
The present invention relates to catalyst systems for the polymerization of C.sub.2 -C.sub.10 -alkenes, containing, as active components, metallocene complexes of metals of subgroups IV and V of the Periodic Table, an oligomeric alumina compound and a cyclic boron compound of the formula IV ##STR2## where
R.sup.18 to R.sup.20 are each C.sub.1 -C.sub.10 -alkyl which may be monosubstituted to trisubstituted by halogen, C.sub.6 -C.sub.15 -aryl or C.sub.1 -C.sub.10 -alkoxy, C.sub.4 -C.sub.7 -cycloalkyl which may be monosubstituted to trisubstituted by halogen, C.sub.1 -C.sub.10 -alkyl or C.sub.1 -C.sub.10 -alkoxy, C.sub.1 -C.sub.10 -alkoxy which may be monosubstituted to trisubstituted by halogen, C.sub.1 -C.sub.10 -alkyl or C.sub.6 -C.sub.15 -aryl, or C.sub.6 -C.sub.15 -aryl which may be monosubstituted to pentasubstituted by halogen, C.sub.1 -C.sub.10 -alkyl or C.sub.1 -C.sub.10 -alkoxy.
The present invention furthermore relates to the use of such catalyst systems for the preparation of polyalkenes and processes for the preparation of polyalkenes with the aid of these catalyst systems.
For the polymerization of olefins with metallocene catalysts, a large excess of oligomeric alumina compounds is required in order to ensure high productivities of the catalyst systems, as is disclosed, for example, in EP-A 444 474. A large excess of aluminum leads to high residual aluminum content in the polymer products, which may have a disadvantageous effect in the processing or necessitates expensive purification steps for the polymer.
WO 92/01005 and EP-A 348 126 describe the preparation of alumoxane compounds by reacting boroxines with trialkylaluminum compounds. WO 92/01005 also discloses a catalyst for the polymerization of olefins which consists of a metallocene and the alumoxane compounds prepared by the abovementioned process. EP-A 348 126 furthermore describes the use of the alumoxane compounds prepared by the abovementioned process as a component in a catalyst system which consists of metallocene and alumoxane compounds and is used in the preparation of polyethylene.
It is an object of the present invention to provide catalyst systems in which the amount of oligomeric alumina compounds can be reduced or which, with the same amount of oligomeric alumina compounds, have a higher productivity and hence permit more economical preparation of polyalkenes.
We have found that this object is achieved by the catalyst systems defined at the outset for the preparation of polyalkenes. We have also found the use of such catalyst systems for the preparation of polyalkenes and processes for the preparation of polyalkenes with the aid of these catalyst systems.
Among the active components, the novel catalyst systems contain one or more complexes of metals of subgroups IV and V of the Periodic Table, in particular of titanium, zirconium, hafnium, vanadium, niobium or tantalum. Preferably used complexes are those in which the metal atom is bonded via .pi. bonds to unsaturated cyclic hydrocarbon radicals, for example cyclopentadienyl, fluorenyl or indenyl groups. Furthermore, in the preferably used complexes the metal atom may also be bonded to further ligands, in particular to fluorine, chlorine, bromine and iodine or to C.sub.1 -C.sub.10 -alkyl, for example methyl, ethyl, propyl or butyl. Particularly suitable complexes contain in particular chlorine.
Particularly useful complexes are of the formula I ##STR3## where
M is titanium, zirconium, hafnium, vanadium, niobium or tantalum, X is fluorine, chlorine, bromine, iodine, hydrogen, C.sub.1 -C.sub.10 -alkyl, C.sub.6 -C.sub.15 -aryl or --OR.sup.6, R.sup.6 is C.sub.1 -C.sub.10 -alkyl, C.sub.6 -C.sub.15 -aryl, alkylaryl, arylalkyl, fluoroalkyl or fluoroaryl, where each alkyl radical is of 1 to 10 carbon atoms and each aryl radical is of 6 to 20 carbon atoms, R.sup.1 to R.sup.5 are each hydrogen, C.sub.1 -C.sub.10 -alkyl, 5-membered to 7-membered cycloalkyl which in turn may carry C.sub.1 -C.sub.10 -alkyl as a substituent, C.sub.6 -C.sub.15 -aryl or arylalkyl, where two adjacent radical

REFERENCES:
patent: 5354721 (1994-10-01), Geerts

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