High activity carbenium-activated polymerization catalysts

C - Chemistry – Metallurgy – 08 – F

Patent

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C08F 10/00 (2006.01) C08F 4/645 (2006.01) C08F 4/659 (2006.01) C08F 210/16 (2006.01)

Patent

CA 2397818

This application discloses triphenyl carbenium NCA's as catalyst activators for a class of asymmetrically bridged hafnocene catalyst precursors. These catalyst precursors are activated into olefin polymerization catalysts and are suitable for gas, solution, and slurry-phase polymerization reactions. The disclosed bridge is methylenyl- or silanylenyl-based and is optionally, alkyl or aryl substituted. The catalytic activity of the disclosed hafnocene catalyst precursors is substantially enhanced over identical catalysts that are activated with other activators.

Cette invention concerne des anions non coordonnant de triphényl carbenium utilisés comme activateurs de catalyse pour une classe de précurseurs catalytiques hafnocène pontés asymétrique. Ces précurseurs catalytiques sont activés en catalyseurs de polymérisation oléfinique et conviennent pour des réactions de polymérisation en phase gazeuse, en solution et en suspension. Le pont selon l'invention est de type méthylènyle ou silanylènyle et est éventuellement substitué alkyle ou aryle. L'activité catalytique des précurseurs catalytiques de hafnocène selon l'invention est sensiblement supérieure à celle de catalyseurs identiques activés par d'autres activateurs.

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