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:
Aug. 22, 2023
Filed:
Feb. 28, 2020
Yatao Rachel HU, Malvern, PA (US);
Parag Rasiklal Shah, Lafayette Hill, PA (US);
David George Collopy, Cheshire, GB;
Robert Joseph Parker, Cheshire, GB;
Myoung Kie Lee, King of Prussia, PA (US);
Yatao Rachel Hu, Malvern, PA (US);
Parag Rasiklal Shah, Lafayette Hill, PA (US);
David George Collopy, Cheshire, GB;
Robert Joseph Parker, Cheshire, GB;
Myoung Kie Lee, King of Prussia, PA (US);
PQ Corporation, Valley Forge, PA (US);
Abstract
A composition, such as a catalyst precursor or a catalyst comprising a Cr coated silica support with particularly defined levels of Na and Al, such that the resulting Cr/Silica catalyst has an increased MI potential is disclosed. In an embodiment, the disclosed catalyst composition comprises a silica-containing substrate made using a base-set gel and comprising a catalytically active metal consisting of Cr, with Al impurities of less than 50 ppm and Na in an amount of less than 800 ppm of the catalyst composition. The disclosed composition has an increased MI potential over a catalyst having higher Al content, a lower Na:Al ratio, or both. Methods of making the disclosed composition, and methods of using it to prepare a polyethylene are also disclosed.