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:
Oct. 14, 2014
Filed:
Dec. 28, 2011
Tim Coffy, Houston, TX (US);
Steven Gray, Florence, KY (US);
David Knoeppel, League City, TX (US);
Cyril Chevillard, Dickinson, TX (US);
David Rauscher, Angleton, TX (US);
Carlos Corleto, Seabrook, TX (US);
Gerhard Guenther, Houston, TX (US);
Brian B. Cole, Kingwood, TX (US);
Stan Biesert, Friendswood, TX (US);
Vincent Barre, Jacksonville, FL (US);
Ruby L. Curtis, League City, TX (US);
Son Nguyen, Friendswood, TX (US);
Danielle Childress, Webster, TX (US);
Tim Coffy, Houston, TX (US);
Steven Gray, Florence, KY (US);
David Knoeppel, League City, TX (US);
Cyril Chevillard, Dickinson, TX (US);
David Rauscher, Angleton, TX (US);
Carlos Corleto, Seabrook, TX (US);
Gerhard Guenther, Houston, TX (US);
Brian B. Cole, Kingwood, TX (US);
Stan Biesert, Friendswood, TX (US);
Vincent Barre, Jacksonville, FL (US);
Ruby L. Curtis, League City, TX (US);
Son Nguyen, Friendswood, TX (US);
Danielle Childress, Webster, TX (US);
Fina Technology, Inc., Houston, TX (US);
Abstract
Disclosed is a bimodal Ziegler-Natta catalyzed polyethylene, having a density of from 0.930 g/cc to 0.960 g/cc, and a molecular weight distribution of from 10 to 25, wherein an article formed therefrom has a PENT of at least 1500. Also disclosed is a method of preparing a tubular article including obtaining a bimodal polyethylene having a density of from 0.930 g/cc to 0.960 g/cc and a molecular weight distribution of from 10 to 25, and processing the polyethylene under conditions where a specific energy input (SEI) is less than 300 kW·h/ton, and wherein the article has a PENT of at least 1500. Further disclosed is a method for controlling the degradation of polyethylene including polymerizing ethylene monomer, recovering polyethylene, extruding the polyethylene, and controlling the degradation of polyethylene by measuring the SEI to the extruder and adjusting throughput and/or gear suction pressure keep SEI less than 300 kW·h/ton, and forming an article.