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:
Jul. 26, 2005
Filed:
Jun. 06, 2003
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);
Stanley J. Katzen, Baton Rouge, LA (US);
Zerong Lin, Kingwood, TX (US);
Anthony N. Speca, Kingwood, TX (US);
ExxonMobil Chemical Patents Inc., Houston, TX (US);
Abstract
Polymerization processes are disclosed for producing polyethylene having a target density and improved environmental stress resistance. Ethylene and optionally one or more α-olefin comonomers, supported chromium catalyst, and metal alkyl cocatalyst are contacted to produce polyethylene. The density of the polyethylene is determined, and the concentration of cocatalyst is adjusted in response to a deviation between the density of the polyethylene and the target density. The catalyst and cocatalyst can be fed separately into the reactor, or can be co-fed, eliminating the need to pre-contact the catalyst and cocatalyst prior to introducing them into the reactor.