Process for preparing olefin polymer

Details Process for preparing olefin polymer Process for preparing olefin polymer

C - Chemistry, Metallurgy

08

F

400/3080

C08F 297/08 (2006.01) C08F 4/642 (2006.01)

Patent

CA 2187204

The present invention provides processes for preparing olefin polymers, by which olefin polymers composed of a propylene block copolymer component and an ethylene/.alpha.- olefin copolymer component are directly prepared by polymerization and olefin polymers excellent in impact resistance as well as in mechanical strength such as rigidity, moldability and heat resistance can be prepared. In the processes of the invention, a step (i) for preparing a crystalline polypropylene component and a step (ii) for preparing a low-crystalline or non-crystalline ethylene/.alpha.- olefin copolymer component are carried out in an arbitrary order using an olefin polymerization catalyst to form a propylene block copolymer component; then another catalyst component is added to the polymerization system; and a step (iii) for preparing a low-crystalline or non-crystalline ethylene/.alpha.-olefin copolymer component is carried out. The components of the olefin polymerization catalyst used for preparing the propylene block copolymer component and the components of another catalyst used for preparing the ethylene/.alpha.-olefin copolymer component (iii) are selected from (A) a solid titanium catalyst component, (B) an organometallic compound, (C) an electron donor, (D) a specific transition metal compound containing a ligand having cyclopentadienyl skeleton, (E-1) an organoaluminum oxy-compound and (E-2) Lewis acid or ionic compound.

Un procédé de préparation d'un polymère oléfinique consite: (i) à préparer un polypropylène cristallin et (ii) à préparer un copolymère faiblement ou non cristallin d'éthylène/ alpha -oléfine, ces deux étapes pouvant se dérouler dans l'ordre désiré en présence d'un catalyseur de polymérisation d'oléfine, pour préparer un copolymère de propylène alterné, puis (iii) à ajouter d'autres catalyseurs au système de polymérisation et former un copolymère faiblement ou non cristallin d'éthylène/ alpha -oléfine. Le catalyseur de polymérisation d'oléfine et les autres catalyseurs sont choisis parmi (A) un catalyseur en titane solide, (B) un composé organométallique, (C) un donneur d'électrons, (D) un composé de métal de transition comprenant un squelette cyclopentadiényle, (E-1) un composé organoaluminoxy, et (E-2) un acide de Lewis ou un composé ionique.

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