C - Chemistry – Metallurgy – 08 – L
Patent
C - Chemistry, Metallurgy
08
L
C08L 23/08 (2006.01) C08L 23/04 (2006.01)
Patent
CA 2564779
The present invention provides bimodal polyethylene resins in which the high molecular weight ethylene copolymer component typically has a relatively narrow molecular weight distribution, with short chain branching content being substantially constant across its molecular weight distribution. The resins of this invention are typically characterized by improved toughness and resistance to slow crack propagation properties making them useful for pressure pipe applications.
La présente invention concerne des résines de polyéthylène bimodales dans lesquelles le constituant copolymère d'éthylène de masse moléculaire élevée présente généralement une répartition de la masse moléculaire relativement étroite, la teneur des ramifications de chaînes courtes étant sensiblement constante sur toute la répartition de la masse moléculaire. Les résines de l'invention se caractérisent généralement par une robustesse et une résistance améliorées qui leur permettent de ralentir la propagation des fissures, ce qui les rend utiles pour des applications mettant en oeuvre des tubes pression.
Krishnaswamy Rajendra K.
Yang Qing
Chevron Phillips Chemical Company Lp
Finlayson & Singlehurst
LandOfFree
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