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
2008-07-01
2008-07-01
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...
C502S127000, C526S124900, C526S125300, C526S125600
Reexamination Certificate
active
07393806
ABSTRACT:
A catalyst composition for the polymerization of propylene comprising one or more Ziegler-Natta procatalyst compositions comprising one or more transition metal compounds and one or more monoesters of aromatic carboxylic acid internal electron donors; one or more aluminum containing cocatalyst; and a mixture of two or more different selectivity control agents, said SCA mixture comprising from 70 to 98 mol percent of one or more esters of one or more aromatic monocarboxylic acids or substituted derivatives thereof, and from 30 to 2 mol percent of one or more alkoxysilane compounds containing one or more 5- or 6-membered cyclic groups optionally containing one or more Group 14, 15 or 16 heteroatoms.
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Bradley Jeffery S.
Chen Lin-feng
Sheard William G.
Zummallen Michael P.
Dow Global Technologies Inc.
Lu Caixia
Whyte Hirschboeck Dudek SC
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