Catalyst – solid sorbent – or support therefor: product or process – Catalyst or precursor therefor – Plural component system comprising a - group i to iv metal...
Reexamination Certificate
2008-05-06
2008-05-06
Lu, Caixia (Department: 1796)
Catalyst, solid sorbent, or support therefor: product or process
Catalyst or precursor therefor
Plural component system comprising a - group i to iv metal...
C502S132000, C502S152000, C502S527170, C526S129000, C526S160000, C526S165000, C526S943000
Reexamination Certificate
active
07368411
ABSTRACT:
Supported stereospecific catalysts and processes for the stereotactic propagation of a polymer chain derived from ethylenically unsaturated monomers which contain three or more carbon atoms or which are substituted vinyl compounds, specifically alpha olefins, particularly the polymerization of propylene to produce syndiotactic or isotactic polypropylene. The supported metallocene catalyst comprises a stereospecific metallocene catalyst and a co-catalyst component comprising at least one of an alkyl alumoxane and an alkylaluminum compound. Both the metallocene catalyst and the co-catalyst are supported on a particulate silica support comprising silica particles having an average particle size of 5-40 microns and an average effective pore size of 50-200 angstroms. The silica support further has a differential pore size distribution of a pore volume of at least 0.01 cm3/g. within a range having a maximum pore width of no more than 300 angstroms. The metallocene has a retention factor on this support of at least 90 wt. % after aging in tri-isobutylaluminum at a temperature of 25° C. for a period of 12 hours.
REFERENCES:
patent: 6432860 (2002-08-01), Shamshoum et al.
patent: 1 038 885 (2000-07-01), None
Campbell, Jr. Donald Gordon
Lopez Margarito
Shamshoum Edwar
Fina Technology Inc
Kilpatrick-Lee Diane
Lu Caixia
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