Hafnium metallocene catalyst for the polymerization of olefins

Details Hafnium metallocene catalyst for the polymerization of olefins Hafnium metallocene catalyst for the polymerization of olefins

C - Chemistry, Metallurgy

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C08F 4/64 (2006.01) C08F 4/60 (2006.01) C08F 10/00 (2006.01) C08F 4/659 (2006.01) C08F 4/6592 (2006.01) C08F 110/06 (2006.01)

Patent

CA 1302384

HAFNIUM METALLOCENE CATALYST FOR THE POLYMERIZATION OF OLEFINS 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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