The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
May. 15, 2012
Filed:
Dec. 16, 2010
Ping Cai, Lake Jackson, TX (US);
Linfeng Chen, Missouri City, TX (US);
Jan W. Van Egmond, Charleston, WV (US);
Michael W. Tilston, Missouri City, TX (US);
Ping Cai, Lake Jackson, TX (US);
Linfeng Chen, Missouri City, TX (US);
Jan W. Van Egmond, Charleston, WV (US);
Michael W. Tilston, Missouri City, TX (US);
Dow Global Technologies LLC, Midland, MI (US);
Abstract
The present invention relates to an improvement for gas phase olefin polymerization process under two or more different flow regimes. The process involves adding a mixed electron donor system to a reactor having two or more different flow regimes, wherein the mixed electron donor system comprises at least one selectivity control agent and at least one activity limiting agent. The invention is particularly well suited for reactor systems which include a regime characterized by having a low-velocity or high-solid holdup, which have been reported to have operational problems such as particle agglomeration and formation of polymer 'chunks'.