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:
Dec. 15, 2009
Filed:
Jun. 06, 2003
Stanley J. Katzen, Baton Rouge, LA (US);
Zerong Lin, Kingwood, TX (US);
Anthony N. Speca, Kingwood, TX (US);
James A. Kendrick, Baton Rouge, LA (US);
Scott T. Roger, Baton Rouge, LA (US);
Stanley J. Katzen, Baton Rouge, LA (US);
Zerong Lin, Kingwood, TX (US);
Anthony N. Speca, Kingwood, TX (US);
James A. Kendrick, Baton Rouge, LA (US);
Scott T. Roger, Baton Rouge, LA (US);
ExxonMobil Chemical Patents Inc., Houston, TX (US);
Abstract
Methods of making supported chromium catalyst systems and processes of polymerizing ethylene using the supported chromium catalyst systems are disclosed. A method of forming a catalyst system in a polymerization reactor includes contacting a supported chromium catalyst and a metal alkyl cocatalyst by cofeeding the catalyst and cocatalyst to the reactor or feeding the catalyst and cocatalyst separately to the reactor, to form a catalyst system. The catalyst and cocatalyst are not pre-contacted prior to the feeding or cofeeding step. The catalyst system can be contacted with ethylene and optional alpha-olefin comonomer to form polyethylene.