Methods for producing polymers with control over composition...

Details Methods for producing polymers with control over composition... Methods for producing polymers with control over composition...

C - Chemistry, Metallurgy

08

F

C08F 210/00 (2006.01) C08F 2/34 (2006.01)

Patent

CA 2569198

Methods for controlling a melt viscosity of a polyolefin, controlling comonomer distribution of a polyolefin, achieving a targeted melt viscosity of a polyolefin, and films made from such polyolefins are provided. The methods include contacting an olefin monomer and at least one comonomer with a catalyst system in the presence of a condensable fluid comprising a saturated hydrocarbon having from 2 to 8 carbon atoms. The catalyst system in one embodiment includes a hafnium metallocene catalyst component.

L'invention porte sur des procédés de régulation de la viscosité à l'état fondu d'une polyoléfine, de la répartition des comonomères d'une polyoléfine, d'obtention d'une viscosité à l'état fondu ciblée d'une polyoléfine et de films obtenus à partir de ses polyoléfines. Cet procédé consiste à mettre en contact un monomère polyoléfinique et au moins un comonomère avec un système catalyseur en présence d'un fluide condensable comprenant un hydrocarbure saturé possédant de 2 à 8 atomes de carbone. Selon une forme d'exécution, le système catalyseur comprend un composant catalyseur métallocène d'hafnium.

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