Process for the preparation of oligomers

C - Chemistry – Metallurgy – 08 – F

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C08F 110/06 (2006.01) C07C 2/32 (2006.01) C08F 2/00 (2006.01) C08F 4/642 (2006.01) C08F 4/76 (2006.01) C08F 10/04 (2006.01) C08F 10/14 (2006.01)

Patent

CA 2451121

Process for the oligomerization of one or more olefinically unsaturated monomers comprising three or more carbon atoms, at least one of these monomers consisting of a C3 to C30 aliphatic mono-olefin, which process comprises reacting the olefinically unsaturated monomer(s) under oligomerization conditions in the presence of an effective amount of a catalyst system based on, a) a specific titanium bisamide compound or its dimer; b) one or more activating cocatalysts comprising at least one boron atom; and optionally, but in any event if the titanium bisamide compound or its dimer comprise halogen; c) one or more aluminium alkyls or alumoxanes. A mixture of homo-oligomers of propylene is obtainable by the above process, which mixture comprises oligomers of propylene based on up to 20 propylene molecules, wherein at least 50 mole % of the oligomer chains have a terminal vinyl group.

L'invention concerne un procédé d'oligomérisation d'un ou de plusieurs monomères oléfiniquement insaturés comprenant trois atomes de carbone ou davantage, au moins l'un de ces monomères comprenant une mono-oléfine aliphatique en C¿3? à C¿30?, procédé caractérisé en ce qu'on fait réagir le/ ou les monomères oléfiniquement insaturés, dans des conditions d'oligomérisation, en présence d'une quantité efficace d'un système catalyseur à base de (a) un composé spécifique bisamide de titane ou son dimère ; (b) un ou plusieurs catalyseurs d'activation comprenant au moins un atome de bore ; et éventuellement, lorsque le composé bisamide de titane ou son dimère renferme un halogène : (c) un ou plusieurs aluminium-alkyles ou alumoxanes. Un mélange d'homo-oligomères de propylène peut ainsi être obtenu par le procédé précité, ledit mélange comprenant des oligomères de propylène à base, d'au maximum, 20 molécules de propylène, et dans lequel au moins 50 % mol des chaînes oligomères présentent un groupe terminal vinyle.

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