Polyethylene composition for pressure pipes with enhanced...

C - Chemistry – Metallurgy – 08 – L

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C08L 23/04 (2006.01) F16L 9/12 (2006.01) F16L 11/04 (2006.01)

Patent

CA 2665279

The present invention relates to a polyethylene composition comprising a base resin which comprises (a) an ethylene homo- or copolymer fraction (A); and (b) an ethylene homo- or copolymer fraction (B), wherein (i) fraction (A) has a lower average molecular weight than fraction (B); (ii) the base resin has a density of 940 to 947 kg/m3; (iii) the polyethylene composition has an MFR5 of 0.1 to 0.5 g/10 min; and (iv) the polyethylene composition has an SHI(2.7/210) of 10 to 49. Furthermore, the present invention relates to an article, preferably a pipe comprising said composition and to the use of said composition for the production of an article, preferably a pipe.

La présente invention concerne une composition de polyéthylène renfermant une résine de base qui comprend (a) une fraction homopolymère ou copolymère éthylénique (A), et (b) une fraction homopolymère ou copolymère éthylénique (B), la fraction (A) présentant un poids moléculaire moyen inférieur à celui de la fraction (B), (ii) la résine de base présentant une densité comprise entre 940 et 947 kg/m3, (iii) la composition de polyéthylène présentant un MFR5 compris entre 0,1 et 0,5 g/10 min, et (iv) la composition de polyéthylène présentant un SHI(2,7/210) compris entre 10 et 49. En outre, la présente invention concerne un article, de préférence une conduite, comprenant cette composition, ainsi que l'utilisation de ladite composition pour produire un article, de préférence une conduite.

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