Reduced oxidation state transition metal compounds useful as...

Details Reduced oxidation state transition metal compounds useful as... Reduced oxidation state transition metal compounds useful as...

C - Chemistry, Metallurgy

08

F

C08F 4/68 (2006.01) C08F 4/649 (2006.01) C08F 4/69 (2006.01) C08F 10/00 (2006.01)

Patent

CA 2304506

This invention is directed to reduced oxidation state Group 4-6 metal compounds, preferably the first row metals in those groups, suitable for activation as polymerization catalysts and characterized by comprising a substituted hydrotris(pyrazolyl)borate ancillary ligand and a plurality of single or multidentate uninegative ligands, excluding cyclopentadienyl ligands. The invention includes a polymerisation process characterized by comprising contacting one or more monomers polymerizable by coordination or insertion polymerization under suitable polymerization conditions with theses catalyst compositions.

L'invention concerne des composés qui renferment des métaux des groupes 4 à 6 faiblement oxydés, de préférence ceux appartenant à la première rangée de ces groupes, et qui sont utiles pour l'activation en tant que catalyseurs de polymérisation. Ces composés sont caractérisés par le fait qu'ils comprennent un ligand auxiliaire à base d'hydrotris(pyrazolyl)borate substitué, et une pluralité de ligands mononégatifs mono ou pluridentés, à l'exception des ligands à base de cyclopentadiényle. L'invention concerne également un procédé de polymérisation qui consiste à mettre en contact un ou plusieurs monomères polymérisables par polymérisation par coordination ou par insertion, dans des conditions de polymérisation appropriées, avec lesdites compositions catalytiques.

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