Supported catalysts for gas phase olefin polymerization

C - Chemistry – Metallurgy – 08 – F

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C08F 4/64 (2006.01) C08F 2/00 (2006.01) C08F 10/00 (2006.01) C08F 210/16 (2006.01) C08F 4/659 (2006.01) C08F 4/6592 (2006.01)

Patent

CA 2499414

Olefin polymerization in the presence of heterogeneous supported catalysts is improved by incorporating into the supported catalyst a unifunctional hydrophobic tether comprising a hydrophobic portion containing no basic nitrogen and a univalent reactive group. The unifunctional hydrophobic tether reduces fouling and sheeting in gas phase polymerization processes and improves polymer morphology and bulk density in slurry polymerization processes, while substantially maintaining or enhancing catalyst polymerization activity.

L'invention a trait à un procédé permettant d'améliorer la polymérisation d'oléfines en présence de catalyseurs supportés hétérogènes, par l'incorporation dans le catalyseur supporté d'une tige hydrophobe monofonctionnelle comprenant une partie hydrophobe dépourvue d'azote basique et un groupe réactif monovalent. La tige hydrophobe monofonctionnelle réduit l'encrassement et la formation de dépôts lors de procédés de polymérisation en phase gazeuse, et améliore la morphologie du polymère et le poids volumique apparent lors de procédés de polymérisation en suspension, tout en maintenant ou augmentant l'activité de polymérisation du catalyseur.

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