Fina Technology, Inc.

Danielle Childress

David J Rauscher

Steven Daniel Gray

Tim J Coffy

David W Knoeppel

Vincent Henri Barre

Gerhard Guenther

Cyril Chevillard

Carlos R Corleto

Ruby Curtis

Brian Cole

Stan Biesert

Son Nguyen

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&#xb7;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&#xb7;h/ton, and forming an article.

Bimodal pipe resin and products made therefrom

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Webster, TX, United States of America

Danielle Childress