BIMODAL POLYETHYLENE RESINS AND PIPES PRODUCED THEREFROM

Disclosed herein are ethylene-based polymers generally characterized by a density of at least 0.94 g/cm3, a high load melt index from 4 to 20 g/10 min, a zero-shear viscosity at 190 oC from 20,000 to 400,000 kPa-sec, and a relaxation time at 190 oC from 225 to 3000 sec. These ethylene polymers can b...

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Bibliographische Detailangaben
Hauptverfasser:	LANIER, ELIZABETH M, SUKHADIA, ASHISH M, INN, YONGWOO, ROHATGI, VIVEK
Format:	Patent
Sprache:	eng ; fre
Schlagworte:	AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F,C08G BLASTING CHEMISTRY COMPOSITIONS BASED THEREON COMPOSITIONS OF MACROMOLECULAR COMPOUNDS ENGINEERING ELEMENTS AND UNITS GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVEFUNCTIONING OF MACHINES OR INSTALLATIONS GENERAL PROCESSES OF COMPOUNDING HEATING JOINTS OR FITTINGS FOR PIPES LIGHTING MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVINGCARBON-TO-CARBON UNSATURATED BONDS MEANS FOR THERMAL INSULATION IN GENERAL MECHANICAL ENGINEERING METALLURGY ORGANIC MACROMOLECULAR COMPOUNDS PIPES SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING THEIR PREPARATION OR CHEMICAL WORKING-UP THERMAL INSULATION IN GENERAL WEAPONS WORKING-UP
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Beschreibung
Zusammenfassung:	Disclosed herein are ethylene-based polymers generally characterized by a density of at least 0.94 g/cm3, a high load melt index from 4 to 20 g/10 min, a zero-shear viscosity at 190 oC from 20,000 to 400,000 kPa-sec, and a relaxation time at 190 oC from 225 to 3000 sec. These ethylene polymers can be produced by peroxide-treating a broad molecular weight distribution Ziegler-catalyzed resin, and can be used in large diameter, thick wall pipes and other end-use applications. L'invention concerne des polymères à base d'éthylène caractérisés généralement par une densité d'au moins 0,94 g/3, un indice de fusion à charge élevée de 4 à 20 g/10 min, une viscosité à cisaillement nul à 190 oC de 20 000 à 400 000 kPa-Sec, et un temps de relaxation à 190 oC de 225 à 3 000 sec. Ces polymères d'éthylène peuvent être produits par traitement au peroxyde d'une résine ayant subie une catalyse de Ziegler à large distribution de poids moléculaire, et peuvent être utilisés dans des tuyaux de grand diamètre à paroi épaisse et d'autres applications d'utilisation finale.