Olefin polymerization methods

C - Chemistry – Metallurgy – 08 – F

Patent

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C08F 4/659 (2006.01) C08F 10/00 (2006.01)

Patent

CA 2615530

Methods for making polyolefins are disclosed. One method comprises polymerizing an olefin in the presence of a catalyst system comprising a single-site complex, an agglomerated metal oxide/clay support-activator, and an ionic borate. Including an ionic borate with the support-activator provides an unexpected boost in catalyst activity and gives polyolefins with high molecular weight and improved comonomer incorporation. In another method of the invention, an olefin is polymerized in the presence of an indenoindolyl metal alkylated complex and an agglomerated metal oxide/clay support- activator. Use of alkylated indenoindolyl complexes with the support- activators provides improved activity compared with metal halides.

La présente invention concerne des procédés permettant d~obtenir des polyoléfines. Un procédé consiste à polymériser une oléfine en présence d~un système de catalyse comprenant un complexe doté d~un site unique, un activateur de support d~oxyde de métal/argile aggloméré et un borate ionique. Le fait d~inclure un borate ionique à l~activateur de support stimule de manière inattendue l~activité de catalyse et génère des polyoléfines dotées d~un poids moléculaire élevé et capables de mieux incorporer les comonomères. Dans un autre mode de réalisation de l~invention, une oléfine est polymérisée en présence d~un complexe indénoindolyle de métaux alkylés et d~un activateur de support d~oxyde métal/argile aggloméré. L~emploi de complexes indénoindolyles alkylés avec les activateurs de support permet d~obtenir une activité bien meilleur qu~avec des halogénures métalliques.

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