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. 12, 2020
Filed:
Jun. 30, 2011
Ping Cai, Lake Jackson, TX (US);
Jan W. Van Egmond, Charleston, WV (US);
Matthew J. Fedec, Lake Jackson, TX (US);
Jeffrey D. Goad, Barboursville, WV (US);
Robert C. Brady, Iii, Missouri City, TX (US);
Linfeng Chen, Missouri City, TX (US);
Ping Cai, Lake Jackson, TX (US);
Jan W. Van Egmond, Charleston, WV (US);
Matthew J. Fedec, Lake Jackson, TX (US);
Jeffrey D. Goad, Barboursville, WV (US);
Robert C. Brady, III, Missouri City, TX (US);
Linfeng Chen, Missouri City, TX (US);
W. R. Grace & Co.-Conn., Columbia, MD (US);
Abstract
The present invention relates to an improvement for gas-phase olefin polymerization process having relatively high bed bulk density. The improvement involves the use of mixed external electron donors when polymerizing propylene in a gas-phase reactor having a polymer bed with a bulk density greater than 128 kg/m, optionally with one or more comonomers, wherein the mixed electron donor system comprises at least a first external electron donor and a second external electron donor, and wherein the first external electron donor is a carboxylate compound.