Process for the preparation of multimodal high density polyethylene

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United States of America Patent

PATENT NO 12012504
APP PUB NO 20210147660A1
SERIAL NO

17056855

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Abstract

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The invention provides a process for the preparation of a multimodal high density polyethylene (HDPE) having a melt flow rate (MFR2) of 0.1 to 4.0 g/10 min, said process comprising: (i) polymerising ethylene in a first polymerisation stage in the presence of a Ziegler-Natta catalyst to prepare a first ethylene homopolymer having a MFR2 from 10 to 500 g/10 min; (ii) polymerising ethylene in a second polymerisation stage in the presence of said catalyst and said first ethylene homopolymer to prepare an ethylene homopolymer mixture comprising said first ethylene homopolymer and a second ethylene homopolymer, said mixture having a MFR2 from 50 to 1000 g/10 min; and (iii) polymerising ethylene and at least one alpha-olefin comonomer in a third polymerisation stage in the presence of said catalyst and said ethylene homopolymer mixture to prepare said multimodal HDPE.

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Patent Owner(s)

Patent OwnerAddress
BOREALIS AGAUSTRIA LENZING UPPER AUSTRIA

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Albunia, Alexandra Romina Linz, AT 12 24
Cheng, Joy Jie Linz, AT 5 0
Jamieson, John Porvoo, FI 50 403
Thorman, Joseph Porvoo, FI 31 559
Tran, Anh Tuan Linz, AT 29 102
Tupe, Ravindra Porvoo, FI 21 28

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