Method for polymerisation of olefins with indeno-indolyl...

C - Chemistry – Metallurgy – 08 – F

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C08F 10/02 (2006.01) C08F 4/642 (2006.01) C08F 110/02 (2006.01) C08F 210/02 (2006.01) C08F 4/659 (2006.01) C08F 210/16 (2006.01)

Patent

CA 2480399

A method for making ethylene polymers and copolymers is disclosed. The method uses a catalyst system comprising a low level of an aluminum-containing activator, a bridged indenoindolyl transition metal complex, and a treated silica support. The method enables economical preparation of ethylene copolymers having very low density. The silica-supported, bridged complexes incorporate comonomers efficiently and are valuable for a commercial slurry loop process. Use of a bridged indeno[2,1-b]indolyl complex provides exceptionally efficient comonomer incorporation, and gives polymers with a substantial and controlled level of long-chain branching. The method facilitates the production of a wide variety of polyolefins, from HDPE to plastomers.

L'invention concerne un procédé de fabrication de polymères et de copolymères d'éthylène, qui consiste à utiliser un système catalyseur comprenant un faible niveau d'un activateur contenant de l'aluminium, un complexe de métal de transition indéno-indolyle ponté, et un support de silice traité. Le procédé permet une préparation économique de copolymères d'éthylène de très faible densité. Les complexes pontés à support de silice incorporent efficacement des comonomères et sont précieux au niveau du processus commercial en boucle à combustible en suspension. L'utilisation d'un complexe indéno[2,1-b]indolyle ponté permet une incorporation particulièrement rentable de comonomères, et donne des polymères présentant un niveau de ramification à longue chaîne que l'on peut sensiblement réguler. Ledit procédé facilite la production d'une grande variété de polyoléfines, aussi bien des HDPE que des plastomères.

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