Improved easy processing linear low density polyethylene

C - Chemistry – Metallurgy – 08 – F

Patent

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Details

C08F 210/16 (2006.01) C08F 2/34 (2006.01) C08F 4/6592 (2006.01) C08J 5/18 (2006.01)

Patent

CA 2283246

A polymer of ethylene and at least one alpha olefin having at least 5 carbon atoms obtainable by a continuous gas phase polymerization using supported catalyst of an activated molecularly discrete catalyst such as a metallocene in the substantial absence of an aluminum alkyl based scavenger, which polymer has a Melt Index (MI) as herein defined of from 0.1 to 15; a Compositional Distribution Breadth Index (CDBI) as defined herein of at least 70 %, a density of from 0.910 to 0.930 g/ml; a Haze value as herein defined of less than 20 %; a Melt Index ratio (MIR) as herein defined of from 35 to 80; an averaged Modulus (M) as herein defined of from 20 000 to 60 000 psi (pounds per square inch) and a relation bewteen M and the Dart Impact Strength in g/mil (DIS) complying with formula (I).

La présente invention concerne un polymère d'éthylène et au moins une alpha -oléfine portant au moins 5 atomes de carbone que l'on peut obtenir par polymérisation continue en phase gazeuse en utilisant le catalyseur supporté d'un catalyseur moléculaire discret activé tel qu'un métallocène sensiblement en l'absence d'un capteur à base d'alkyle-aluminium. L'indice de fusion (MI) de ce polymère, tel que défini ici, est compris entre 0,1 et 15. L'indice de largeur de distribution dans la composition (CDBI) tel que défini ici, fait au moins 70 %. La densité est comprise entre 0,910 et 0,930 g/ml. Le coefficient de turbidité, tel que défini ici, est inférieur à 20 %. L'indice proportionnel de fusion (MIR) tel que défini ici est compris entre 35 et 80. Le module élastique moyen (M) tel que défini ici est compris entre 20.000 et 60.000 psi, et le rapport entre M et l'indice de pénétration du percuteur (DIS) exprimé en g/mil vérifie l'équation (I).

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