Method for polymerizing .alpha.-olefins in a gaseous phase

Details Method for polymerizing .alpha.-olefins in a gaseous phase Method for polymerizing .alpha.-olefins in a gaseous phase

C - Chemistry, Metallurgy

08

F

C08F 2/44 (2006.01) C08F 2/34 (2006.01) C08F 10/00 (2006.01) C08F 10/02 (2006.01)

Patent

CA 2286321

The invention relates to a method for polymerizing .alpha.-olefins in a gaseous phase at a temperature ranging from 30 to 150 ~C and at a pressure between 5 and 80 bars with a catalyst or a catalyst mixture which contains, as an antistatic agent, 0.1-5 wt. % ZnO and/or water-free MgO in relation to the total catalyst mixture. The inventive method excludes a method according to which the catalyst mixture contains a chrome catalyst and an MgO-based Ziegler catalyst which is modified with an alkene and alkylaluminium hydride and contains free MgO, the total MgO volume being no less than 2 wt. % of the catalyst mixture.

L'invention concerne un procédé de polymérisation d'.alpha.-oléfine en phase gazeuse à une température comprise entre 30 et 150 ·C et sous une pression comprise entre 5 et 80 bar, avec un catalyseur ou un mélange de catalyseurs qui contient, comme antistatique, 0,1 à 5 % en poids de ZnO et/ou de MgO exempt d'eau, par rapport à la quantité totale du mélange de catalyseurs. Est exclus un procédé selon lequel le mélange de catalyseurs contient un catalyseur au chrome et un catalyseur Ziegler supporté par MgO qui est modifié par un alcène et par un hydrure d'aluminium-alkyle, ainsi que du MgO libre, et la quantité totale de MgO n'est pas inférieure à 2 % en poids du mélange de catalyseurs.

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