Process for the (co)polymerization of olefins

C - Chemistry – Metallurgy – 08 – F

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C08F 297/08 (2006.01) C08F 2/42 (2006.01) C08F 4/642 (2006.01) C08F 10/00 (2006.01) C08F 10/06 (2006.01) C08F 4/659 (2006.01) C08F 110/06 (2006.01)

Patent

CA 2178077

Multistage process for the polymerization of one or more olefins of the formula CH2=CHR, in which R is hydrogen or an alkyl, cycloalkyl or aryl group having from 1 to 10 carbon atoms, comprising: (A) a first stage of polymerization, in which a first olefin polymer is prepared in the presence of titanium catalyst or vanadium catalyst; (B) a treatment stage in which the catalyst used previously is deactivated and in which a metallocene compound is supported on the olefin polymer produced in stage (A); and (C) a second stage of polymerization in which one or more olefins are polymerized in the presence of the product obtained from stage (B).

Procédé à plusieurs étapes destiné à la polymérisation d'une ou de plusieurs oléfine(s) de la formule CH¿2?=CHR, dans laquelle R représente hydrogène ou un groupe alkyle, cycloalkyle ou aryle possédant 1 à 10 atomes de carbone, ce procédé comprenant: (A) une première étape de polymérisation consistant à préparer un premier polymère d'oléfine en présence d'un catalyseur au titane ou au vanadium; (B) une étape de traitement consistant à désactiver le catalyseur utilisé précédemment et dans laquelle le composé métallocène est supporté sur le polymère d'oléfine produit dans l'étape (A); et (C) une seconde étape de polymérisation consistant à polymériser une ou plusieurs oléfine(s) en présence du produit obtenu de l'étape (B).

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