Method for producing high melting-point polyolefins

C - Chemistry – Metallurgy – 08 – F

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C08F 4/62 (2006.01) C07F 9/50 (2006.01) C07F 9/6568 (2006.01) C07F 17/00 (2006.01) C07F 17/02 (2006.01) C08F 4/44 (2006.01) C08F 4/52 (2006.01) C08F 4/64 (2006.01) C08F 4/643 (2006.01) C08F 10/00 (2006.01) C08F 10/02 (2006.01) C08F 10/06 (2006.01) C08F 32/00 (2006.01) C08F 210/02 (2006.01) C08F 4/619 (2006.01) C08F 4/6192 (2006.01) C08F 4/659 (2006.01) C08F 110/02 (2006.01) C08F 110/06 (2006.01) C08F 210/16 (2006.01) C08F 210/18 (2006.01)

Patent

CA 2259438

High-melting polyolefins can be prepared in bulk, in solution, in suspension or in the gas phase, the catalysts employed being metallocene compounds or .pi. complex compounds of the formulae (see formulae Ia, Ib, XIII and XIIIb) in which CpI and CpII represent carbanions having a cyclopentadienyl-containing structure, .pi.I and .pi.II represent charged or electrically neutral .pi. systems, D represents a donor atom and A represents an acceptor atom, where D and A are linked by a reversible coordinate bond such that the donor group assumes a positive (part) charge and the acceptor group assumes a negative (part) charge, M represents a transition metal of sub-group III, IV, V or VI of the Periodic Table of the Elements (Mendeleev), including the lanthanides and the actinides, X denotes one anion equivalent and n denotes the number zero, one, two, three or four, depending on the charge of M.

Il est possible de fabriquer des polyoléfines à point de fusion élevé en tant que telles, en phase solide, en solution, en suspension ou en phase gazeuse, en utilisant comme catalyseurs des composés métallocènes ou des composés contenant le complexe pi , de formules (I) ou (XIII), dans lesquelles: CpI et CpII représentent des carbanions avec une structure contenant du cyclopentadiényle; pi I et pi II représentent des systèmes pi chargés ou électriquement neutres; D représente un atome donneur et A un atome accepteur, D et A étant reliés par une liaison dative réversible, de façon que le groupe donneur devienne porteur d'une charge (partielle) positive et le groupe accepteur d'une charge (partielle) négative; M représente un métal de transition appartenant aux groupes III, IV, V ou VI de la classification périodique des éléments (tableau de Mendeleiev), y compris les lanthanides et les actinides; X représente un équivalent anionique; et n est 0, 1, 2, 3 ou 4 en fonction de la charge de M.

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