High strength bimodal polyethylene compositions

C - Chemistry – Metallurgy – 08 – F

Patent

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C08F 8/00 (2006.01) C08F 10/04 (2006.01) C08F 10/14 (2006.01) C08F 110/02 (2006.01) C08F 110/04 (2006.01) C08F 110/14 (2006.01) C08F 210/00 (2006.01) C08F 210/04 (2006.01) C08F 210/14 (2006.01) C08L 23/00 (2006.01) C08L 23/04 (2006.01)

Patent

CA 2576155

Disclosed are various compositions, including but not limited to a high strength bimodal polyethylene composition having a density of 0.940 g/cc or more, the composition comprising a high molecular weight polyethylene component having a higher weight average molecular weight (MwHMW) and a low molecular weight polyethylene component having a lower weight average molecular weight (MwLMW), wherein: the ratio of the higher weight average molecular weight to the lower weight average molecular weight (MwHMW:MwLMW) is 30 or more; and the composition qualifies as a PE 100 material such that in accordance with ISO 1167 a pipe formed from the composition that is subjected to internal pipe resistance has an extrapolated stress of 10 MPa or more when the internal pipe resistance curve is extrapolated to 50 or 100 years in accordance with ISO 9080:2003(E).

L~invention porte sur diverses compositions, y compris mais sans s~y limiter une composition de polyéthylène bimodal de résistance élevée d~une densité supérieure ou égale à 0,940 g/cc, la composition comprenant une composante de polyéthylène de poids moléculaire élevé, au poids moléculaire moyen en poids supérieur (MwHMW) et une composante de polyéthylène de faible poids moléculaire, au poids moléculaire moyen inférieur (MwLMW), où : le rapport du poids moléculaire moyen en poids supérieur au poids moléculaire moyen en poids inférieur(MwHMW:MwLMW) est supérieur ou égal à 30 ; et la composition se qualifie comme matériau de PE 100 de telle sorte que selon la norme ISO 1167 un tube formé à partir de la composition soumise à une résistance interne de tube présente une contrainte extrapolée supérieure ou égale à 10 MPa lorsque la courbe de résistance de tube interne est extrapolée à 50 ou 100 ans selon la norme ISO 9080:2003(E).

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