High melt flow propylene polymer produced by gas-phase...

C - Chemistry – Metallurgy – 08 – F

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C08F 10/06 (2006.01) C08F 4/646 (2006.01) C08F 110/06 (2006.01)

Patent

CA 2276689

A process to produce high melt flow propylene polymer comprises polymerizing propylene in the presence of a titanium-containing, magnesium-containing, high activity catalyst and an aluminum alkyl cocatalyst in a gas phase system which uses condensed liquid to control temperature wherein the external catalyst modifier is a tetraalkylorthosilicate, preferably tetraethylorthosilicate, at process conditions of temperature, hydrogen concentration, and Si/Mg, Al/Mg and Al/Si atomic ratios, to produce a high melt flow propylene polymer at high yield.

La présente invention concerne un procédé de production de polymère de propylène à indice de fluage élevé. Ce procédé consiste à polymériser du propylène en présence d'un catalyseur hautement actif contenant du titane et du magnésium, et en présence d'un co-catalyseur d'aluminium alkyl dans un système à phase gazeuse qui utilise un liquide condensé pour réguler la température. En l'occurrence, le modificateur de catalyseur externe est un tétraalkylorthosilicate, de préférence un tétraéthylorthosilicate, intervenant au conditions de température du process, sous atmosphère d'hydrogène concentré, avec des rapports atomiques Si/Mg, Al/Mg et Al/Si permettant la production à rendement élevé de polymère de propylène à indice de fluage élevé.

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