Branched semi-crystalline ethylene-propylene compositions

C - Chemistry – Metallurgy – 08 – F

Patent

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Details

C08F 210/06 (2006.01) C08F 10/06 (2006.01) C08F 210/16 (2006.01) C08F 4/659 (2006.01)

Patent

CA 2356667

Branched ethylene-propylene compositions which have improved melt strength and shear thinning are provided. The weight average branching index g' for the higher molecular weight region of the ethylene-propylene composition is less than 0.95. Additionally, a novel process is provided for efficiently producing a branched ethylene-propylene composition comprising: a) contacting propylene monomers and ethylene monomers in a reactor with an inert hydrocarbon solvent or diluent and a catalyst composition comprising one or more single site catalyst compounds.

L'invention concerne des compositions à base d'éthylène-propylène ramifiées possédant une résistance à la fusion et une fluidification améliorées. L'indice g' de pondération de ramification de la région à plus haut poids moléculaire de la composition à base d'éthylène-propylène est inférieur à 0,95. L'invention concerne en outre un nouveau procédé de production efficace d'une composition ramifiée à base d'éthylène-propylène, le procédé consistant à mettre en contact des monomères de propylène et des monomères d'éthylène dans un réacteur avec un solvant ou diluant hydrocarboné inerte et une composition de catalyse comprenant un ou plusieurs composés de catalyse de site unique.

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