| 摘要 |
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€ƒ [ mol % ] ‰¥ - 0.0612 €ƒd€ƒ [ kg / m 3 ] €ƒmol % ( 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.
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