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1. (WO2018089195) BIMODAL POLYETHYLENE

Pub. No.:    WO/2018/089195    International Application No.:    PCT/US2017/058282
Publication Date: Fri May 18 01:59:59 CEST 2018 International Filing Date: Thu Oct 26 01:59:59 CEST 2017
IPC: C08F 210/02
C08F 10/00
C08L 23/08
C08F 210/16
C08F 10/02
Applicants: UNIVATION TECHNOLOGIES, LLC
Inventors: BORSE, Nitin
CHANDAK, Swapnil
BAFNA, Ayush
MURE, Cliff R.
ZHANG, Yi
LYNN, Timothy R.
KUHLMAN, Roger L.
SZUL, John F.
Title: BIMODAL POLYETHYLENE
Abstract:
Provided are various bimodal polyethylene, including but not limited to a bimodal polyethylene for a pipe having a density of from 0.9340 to 0.9470 gram/cubic centimeters (g/ccm), a melt index (I2) of from 0.1 to 0.7 gram/10 minute, a melt flow ratio (I21/I2) of from 20 to 90. The bimodal polyethylene includes a high molecular weight polyethylene component and a low molecular weight polyethylene component which are a reaction product of a polymerization process performed in a single reactor and that employs a bimodal polymerization catalyst system. The bimodal polymerization catalyst system includes a bimodal catalyst system of bis(2-pentamethylphenylamido)ethyl)amine Zirconium dibenzyl and either (tetramethylcyclopentadienyl)(n-propylcyclopentadienyl)Zirconium dichloride or (tetramethylcyclopentadienyl)(n-propylcyclopentadienyl)zirconium dimethyl in a 3.0:1 molar ratio; and a trim catalyst of (tetramethylcyclopentadienyl)(n-propylcyclopentadienyl)Zirconium dichloridedimethyl in heptane added to adjust melt flow ratio of the bimodal polyethylene.