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US 4,769,510 AGranted
Process for the preparation of polyolefins
AssigneeHoechst Aktiengesellschaft
InventorsWalter Kaminsky, Klaus Kulper, Maria Buschermohle, Hartmut Luker
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Abstract
In the polymerization of propylene and other higher 1-olefins, polymers which have a high degree of isotacticity and a narrow distribution of molecular weight are obtained in the presence of a catalyst system composed of a zirconium compound which is stereo-rigid and chiral and a linear or cyclic aluminoxane. In addition, the catalyst system is exceptionally active.
Claims2
A process for the preparation of polyolefins by polymerizing olefins of the formula CH.sub.2 .dbd.CHR in which
- R=C.sub.1 -C.sub.10 -alkyl,
- on their own or as a mixture, in solvents, liquid monomers or in the gas phase at a temperature from -50.degree. to 200.degree. C. by means of a soluble transition metal compound and aluminoxanes, which comprises carrying out the polymerization in the presence of a catalyst system which consists essentially of:
- (a) ethylene-bis-(4,5,6,7-tetrahydroindenyl)-zirconium dichloride, and
- (b) a methyl aluminoxane of the formula
- Al.sub.2 O(CH.sub.3).sub.4 (Al(CH.sub.3)O).sub.n,
- for a linear methyl aluminoxane, or
- (Al(CH.sub.3)O).sub.n+2
- for a cyclic methyl aluminoxane, or combinations thereof, wherein n is a number from 4 to 20.
5 more elements
Dependencies are inferred from the claim text.