Process for the polymerization of ethylene and a small...

C - Chemistry – Metallurgy – 08 – F

Patent

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C08F 210/18 (2006.01) C08F 2/34 (2006.01) C08F 210/02 (2006.01) C08F 236/20 (2006.01) C08F 4/659 (2006.01) C08F 4/6592 (2006.01)

Patent

CA 2400665

Disclosed is a polymerization process utilizing a low level of diene to control the polymer product's melt index ratio independently of the melt index and density. The process of the invention produces polymers with enhanced processability. More specifically the process produces ethylene based polymers, prepared in gas phase polymerization processes utilizing bulky ligand metallocene polymerization catalysts, having enhanced melt strength and shear-thinning behaviour.

La présente invention concerne un procédé de polymérisation utilisant un faible taux de diène pour réguler le rapport d'indice de fusion du produit de polymère indépendamment de la densité et du l'indice de fusion. Ce procédé permet d'obtenir des polymères caractérisés par une aptitude au traitement améliorée. Plus particulièrement, ce procédé permet d'obtenir des polymères d'éthylène, préparés selon des procédés de polymérisation en phase gazeuse utilisant des catalyseurs de polymérisation de type métallocènes à ligand volumineux, caractérisés par une résistance à la fusion et une fluidification par cisaillement améliorées.

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