Catalyst – solid sorbent – or support therefor: product or process – Catalyst or precursor therefor – Metal – metal oxide or metal hydroxide
Reexamination Certificate
2011-07-19
2011-07-19
Hailey, Patricia L (Department: 1732)
Catalyst, solid sorbent, or support therefor: product or process
Catalyst or precursor therefor
Metal, metal oxide or metal hydroxide
C502S020000, C502S034000, C502S035000, C502S049000
Reexamination Certificate
active
07981832
ABSTRACT:
New methods for activating chromium catalysts for polymerization processes decrease the amount of time required for activation and increase catalyst activity. Rapid heating to a first temperature is followed by a first hold period before heating to a higher second temperature and maintaining the second temperature for a second hold period. In one aspect, the overall activation process takes less than 10 hours.
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Benham Elizabeth A.
McDaniel Max P.
Carroll Rodney B.
Chevron Phillips Chemical Company LP
Conley & Rose, P.C.
Hailey Patricia L
Huseman Cheryl L.
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