Catalyst – solid sorbent – or support therefor: product or process – Catalyst or precursor therefor – Phosphorus or compound containing same
Reexamination Certificate
2007-04-24
2007-04-24
Choi, Ling-Sui (Department: 1713)
Catalyst, solid sorbent, or support therefor: product or process
Catalyst or precursor therefor
Phosphorus or compound containing same
C502S114000, C502S118000, C526S169000, C526S153000, C526S134000, C526S139000, C526S145000
Reexamination Certificate
active
10997727
ABSTRACT:
A copolymer of ethylene and a higher alpha olefin, preferably 1-hexene, can be produced using an activated chromium containing catalyst system and a cocatalyst selected from the group consisting of trialkylboron, trialkylsiloxyalutninum, and a combination of trialkylboron and thalkylaluminum compounds. The polymerization process must be carefully controlled to produce a copolymer resin having an exceptionally broad molecular weight distribution, extremely high PENT ESCR values, and a natural branch profile that impacts branching preferably into the high molecular weight portion of the polymer. The resulting copolymer resin is especially useful in high stiffness pipe applications.
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Benham Elizabeth A.
DesLauriers Paul J.
McDaniel Max P.
Wolfe Al R.
Carroll Rodney B.
Chevron Philips Chemical Company LP
Choi Ling-Sui
Conley & Rose, P.C.
Huseman Cheryl L.
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