Catalyst – solid sorbent – or support therefor: product or process – Catalyst or precursor therefor – Plural component system comprising a - group i to iv metal...
Patent
1987-09-11
1988-12-27
Garvin, Patrick P.
Catalyst, solid sorbent, or support therefor: product or process
Catalyst or precursor therefor
Plural component system comprising a - group i to iv metal...
526153, 526160, C08F 464
Patent
active
047940964
ABSTRACT:
The present invention provides a catalyst system for the polymerization and copolymerization of olefins with the system comprising a chiral, stereorigid hafnium metallocene catalyst in combination with an aluminum compound. The aluminum compound is preferably an alumoxane and may be a mixture of alumoxane and trimethyl aluminum. It was discovered that this mixture causes a transformation of the catalyst over time. The catalyst system may also include a solvent to increase the solubility of the metallocene catalyst. It was discovered that these catalyst systems produce useful polymer products with molecular weights greater than 10,000.
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Basel, "Olefin Polymerization with Highly Active Soluble Zirconium Compounds Using Aluminoxane as Co-Catalyst," Die Makromolekulare Chemie/Macromolecular Symposia, Jun. 3, 1986, Switzerland, pp. 377-387.
Kaminsky, "Stereoselektive Polymerization von Olefinen mit Homogenen, Chiralen Ziegler-Natta-Katalysatoren," 145/146, 1986, pp. 149-160.
John A. Ewen, "Mechanisms of Stereochemical Control in Propylene Polymerizations with Soluble Group 4B Metallocene/Methylalumoxane Catalysts", Journal of the American Chemical Society, vol. 106, No. 21, 1984, pp. 6355-6364.
John A. Ewen, "Catalytic Polymerization of Olefins", Proceedings of the International Symposium on Future Aspects of Olefin Polymerization, 1986, pp. 271-292.
Abokhair John K.
Cheairs M. Norwood
Fina Technology, Inc.
Garvin Patrick P.
Watt Stuart L.
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