High-stiffness propylene polymers and a process for the...

C - Chemistry – Metallurgy – 08 – F

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C08F 10/06 (2006.01) C08F 4/649 (2006.01)

Patent

CA 2372531

The present invention concerns high-stiffness polymer composition and a process for producing a polymer composition nucleated with a polymeric nucleating agent containing vinyl compound units. The method comprises modifying a catalyst by polymerizing a vinyl compound in the presence of said catalyst and a strongly coordinating donor in a medium, which does not essentially dissolve the polymerized vinyl compound, and by continuing the polymerization of the vinyl compound until the concentration of unreacted vinyl compounds is less than about 0.5 wt-%. The thus obtained modified catalyst composition is used for polymerizing propylene optionally together with comonomers in the presence of said modified catalyst composition. Modification of the catalyst according to the present invention will reduce production costs and provide highly reliable catalyst activity and polymers of high stiffness.

La présente invention concerne une composition de polymères de haute rigidité et un procédé permettant l'obtention d'une composition de polymère nucléée au moyen d'un agent de nucléation polymère contenant des unités de composés vinyliques. A cet effet, pour modifier un catalyseur, on polymérise un composé vinylique en présence dudit catalyseur et d'un donneur fortement coordonnant, qui ne vient pas sensiblement dissoudre le composé vinylique polymérisé. On poursuit alors la polymérisation du composé vinylique jusqu'à atteindre, concernant les composés vinyliques restés en dehors de la réaction, une concentration inférieure à environ 0,5% en poids. La composition de catalyseur modifié ainsi obtenue convient à la polymérisation du propylène, éventuellement en association avec des comonomères, en présence de ladite composition de catalyseur modifié. La modification du catalyseur selon la présente invention permet une réduction des coûts de production, tout en assurant une activité catalytique très fiable, aboutissant à la production de polymères de rigidité élevée.

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