Rheology-modified polyolefins

C - Chemistry – Metallurgy – 08 – F

Patent

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Details

C08F 10/02 (2006.01) C08F 8/00 (2006.01) C08F 210/16 (2006.01) C08J 3/24 (2006.01) C08J 3/28 (2006.01) C08L 23/04 (2006.01)

Patent

CA 2244999

The subject invention is directed to a rheology-modified ethylene polymer having less than 0.5 weight percent gel, a composition distribution breadth index (CDBI) greater than 50 percent, and a molecular weight distribution (M w/M n) of less than 4.0, which is characterized as having improved rheological performance and/or melt strength attributes relative to the unmodified polymer. The subject invention is further directed to polymer blends which comprise the rheology- modified polymers, and to a process for preparing the rheology-modified polymers.

L'invention concerne un polymère de l'éthylène, dont la rhéologie a été modifiée, contenant moins de 0,5 % en poids de gel, un indice de largeur de la répartition de la composition supérieur à 50 pour-cent et une répartition du poids moléculaire (Mw/Mn) inférieure à 4,0. Le polymère de l'invention a des propriétés rhéologiques améliorées et/ou des propriétés de résistance à la fragilité de fusion améliorées par rapport au polymère non modifié. L'invention concerne, en outre, des mélanges de polymères qui contiennent les polymères à rhélologie modifiée et un procédé pour préparer ces polymères à rhéologie modifiée.

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