Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Polymers from only ethylenic monomers or processes of...
Reexamination Certificate
2008-09-02
2008-09-02
Choi, Ling-Sui (Department: 1796)
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Polymers from only ethylenic monomers or processes of...
C526S351000, C526S124200, C526S124300, C502S103000, C502S116000, C502S127000
Reexamination Certificate
active
10568981
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 cocatalysts; and a mixture of two or more different selectivity control agents, said SCA mixture comprising from 98.0 to 99.9 mol percent of one or more esters of one or more aromatic monocarboxylic acids or substituted derivatives thereof, and from 2.0 to 0.1 mol percent of one or more alkoxysilane compounds.
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Choi Ling-Sui
Union Carbide Chemicals & Plastics Technology LLC
Whyte Hirschboeck Dudek SC
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