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)
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:
Assignee:
BOREALIS AG (AT)
International Classes:
C08F2/00; C08L23/06; F16L9/12
Attorney, Agent or Firm:
KADOR & PARTNER (München, DE)
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