Method and catalyst for producing polyolefins of medium to...

C - Chemistry – Metallurgy – 08 – F

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C08F 10/00 (2006.01) C08F 4/642 (2006.01) C08F 4/659 (2006.01) C08F 4/6592 (2006.01)

Patent

CA 2281559

The invention relates to a method for producing polyolefins of medium to ultra- high molecular weight by homo- or copolymerization of olefins, specifically ethylene, with other alpha-olefins in the presence of a metallocene-type mixed Ziegler-Natta-catalyst placed onto an organic polymer material for producing shaped bodies, for example by extrusion, injection moulding, film blowing, sinter pressing or ram extrusion. According to the invention the catalyst contains as organic polymer material a partly chloromethylated styrene-divinyl benzene copolymer, a complex compound placed onto same containing Mg, Al and transition metals of the fourth subgroup, as well as reaction products of the latter with other organic compounds and transition metals of the fourth subgroup.

L'invention concerne un procédé de préparation de polyoléfines de poids moléculaire moyen à ultra élevé, par homo- ou copolymérisation d'oléfines, spécialement d'éthylène, avec d'autres oléfines en présence d'un catalyseur mixte Ziegler-Natta de type métallocène, porté sur un matériau polymère organique, pour la production de corps de moulage par exemple par extrusion, moulage par injection, soufflage de feuilles, compression par sintérisation ou extrusion par télédynamique. Le catalyseur obtenu selon l'invention contient comme matériau polymère organique un copolymérisat styrène-divinylbenzène partiellement chlorométhylé, un composé complexe porté dessus, qui comprend Mg, Al et des métaux de transition du quatrième groupe secondaire, ainsi que des produits de réaction de ces derniers avec d'autres composés organiques et des métaux de transition du quatrième groupe secondaire.

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