Multimodal polyethylene composition for pipes

The present invention relates to a multimodal polyethylene composition for pipes which comprises polyethylene composition comprising a base resin which comprises (A) an ethylene homo- or copolymer fraction, and (B) an ethylene copolymer fraction comprising at least one alpha-olefin comonomer having...

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Bibliographische Detailangaben
Hauptverfasser:	BAECKMAN, MATS, GUSTAFSSON, BILL, VAN PRAET, ERIC
Format:	Patent
Sprache:	eng ; fre ; ger
Schlagworte:	CHEMISTRY COMPOSITIONS BASED THEREON COMPOSITIONS OF MACROMOLECULAR COMPOUNDS MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVINGCARBON-TO-CARBON UNSATURATED BONDS METALLURGY ORGANIC MACROMOLECULAR COMPOUNDS THEIR PREPARATION OR CHEMICAL WORKING-UP
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Beschreibung
Zusammenfassung:	The present invention relates to a multimodal polyethylene composition for pipes which comprises polyethylene composition comprising a base resin which comprises (A) an ethylene homo- or copolymer fraction, and (B) an ethylene copolymer fraction comprising at least one alpha-olefin comonomer having at least 4 carbon atoms, wherein (i) fraction (A) has a lower average molecular weight than fraction (B), and (ii) the comonomer content and the density d of the base resin satisfy the following relation: comonomer [ mol % ] ¥ - 0.0612 d [ kg / m 3 ] mol % ( kg / m 3 ) + 58.6 , and (iii) the base resin comprises more than 0.5 mol% of at least one alpha-olefin comonomer having at least 4 carbon atoms. Furthermore, the present invention relates to a process for the production of said composition, a pipe comprising said composition and to the use of said composition for the production of a pipe.