Metallocene-produced very low density polyethylenes

C - Chemistry – Metallurgy – 08 – F

Patent

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C08F 10/02 (2006.01) B32B 27/32 (2006.01) C08F 2/34 (2006.01) C08F 210/02 (2006.01) C08F 210/16 (2006.01) C08J 5/18 (2006.01) C08L 23/06 (2006.01) C08L 23/08 (2006.01) C09D 123/08 (2006.01)

Patent

CA 2414050

A very low density polyethylene having a density of 0.890 to 0.915 and a Dart Drop value of at least about 450 g/mil or above is disclosed. Gas phase polymerization methods are also disclosed for making very low density linear polyolefins utilizing a metallocene catalyst, and the resulting polyolefin products. In a specific embodiment, a gas phase polymerization process is disclosed relating to the formation of a linear polyethylene having a very low density, e.g., ranging from 0.890 to 0.915, but with improved toughness.

La présente invention concerne un polyéthylène très basse densité dont la densité est de 0,890 à 0,915 pour un coefficient de résistance au choc au mouton (Dart Drop Test) de 450 g/mil. L'invention concerne également, d'une part un procédé de polymérisation en phase gazeuse pour fabriquer des polyoléfines linéaires de très basse densité en utilisant un catalyseur métallocénique, et d'autre part des produits polyoléfiniques obtenus. Selon un mode de réalisation, l'invention concerne un procédé de polymérisation en phase gazeuse pour la formation d'un polyéthylène linéaire de très basse densité, notamment dans une plage de 0,890 à 0,915, mais présentant une meilleure résilience.

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