Preparation of ultra-high-molecular-weight polyethylene

Details Preparation of ultra-high-molecular-weight polyethylene Preparation of ultra-high-molecular-weight polyethylene

C - Chemistry, Metallurgy

08

F

C08F 4/649 (2006.01) C08F 110/02 (2006.01)

Patent

CA 2382368

An ultra-high-molecular-weight polyethylene (UHMWPE) is disclosed. The UHMWPE has a weight average molec-ular weight (Mw) greater than about 3,000,000 and molecular weight distribution less than about 5. A process for making the UHMWPE is also disclosed. The process is performed with a heteroatomic ligand- containing single-site catalyst in the presence of a non-alumoxane activator, but in the absence of an .alpha.-olefin, an aromatic solvent, and hydrogen.

La présente invention concerne un polyéthylène à poids moléculaire très élevé (UHMW). Ce polyéthylène UHMW possède un poids moléculaire moyen en poids (Mw) supérieur à environ 3000000 et une distribution de poids moléculaire inférieure à environ 5. L'invention concerne aussi un procédé de fabrication du polyéthylène UHMW. Ce procédé se déroule avec un catalyseur à site unique contenant un ligand hétéroatomique en présence d'un activateur sans alumoxane mais en l'absence d'une alpha -oléfine, de solvant aromatique et d'hydrogène.

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