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Title:
POLYETHYLENE COMPOSITION FOR PIPE APPLICATIONS
Document Type and Number:
WIPO Patent Application WO/2015/051879
Kind Code:
A8
Abstract:
The present invention relates to a polyethylene composition for pipe applications comprising a base resin having a density of more than 946.0 kg/m3 and equal to or less than 955.0 kg/m3, wherein the composition has a MFR21 of 1.7 to 7.0 g/10 min and a FRR21/5 of more than 10 to equal to or less than 40, and a polyethylene composition obtainable by a multistage process, the multistage process comprising polymerizing ethylene in the presence of a silica supported Ziegler Natta catalyst in a first loop reactor, transferring a first intermediate material to a second loop reactor, further polymerizing said first intermediate material for obtaining a second intermediate material and transferring said second intermediate material to a gas phase reactor, feeding ethylene and comonomer to the gas phase reactor for obtaining a base resin, and finally extruding the base resin together with stabilizers and carbon black into the polyethylene composition. The invention further concerns a multistage process for the production of the polyethylene composition and articles, preferably pipes, made from the inventive polyethylene composition.

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Inventors:
VAHTERI MARKKU (FI)
WAHNER UDO (AT)
HJERTBERG THOMAS (SE)
LIU YI (AT)
PIEL TANJA (AT)
ALBUNIA ALEXANDRA ROMINA (AT)
Application Number:
PCT/EP2014/002588
Publication Date:
November 26, 2015
Filing Date:
September 24, 2014
Export Citation:
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Assignee:
BOREALIS AG (AT)
International Classes:
C08F2/00; C08L23/06; F16L9/12
Attorney, Agent or Firm:
KADOR & PARTNER (München, DE)
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