Polyethylene films with improved physical properties

C - Chemistry – Metallurgy – 08 – J

Patent

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Details

C08J 5/18 (2006.01) B29C 47/00 (2006.01) C08F 10/02 (2006.01) C08F 210/16 (2006.01)

Patent

CA 2454460

Metallocene catalyzed polyethylenes are found to have improved physical properties, improved processability and improved balance of properties. Surprisingly, there is a direct relationship between MD shrinkage, and MD tear. Additionally, MD tear is greater than TD tear, and MD tear is also greater than intrinsic tear. MD tear to TD tear ratios are above 0.9, and dart drop impact is above 500 g/mil. The polyethylenes have a relatively broad composition distribution and relatively broad molecular weight distribution.

Selon cette invention, les polyéthylènes catalysés par le métallocène présentent de meilleures propriétés physiques, une meilleure aptitude au traitement ainsi qu'un meilleur équilibre de propriétés. Il s'avère qu'il existe un lien direct entre un retrait sens machine et un éclatement sens machine. En outre, l'éclatement sens machine est supérieur à l'éclatement transversal, et l'éclatement sens machine est également supérieur à l'éclatement intrinsèque. Les rapports éclatement sens machine/éclatement transversal sont supérieurs à 0,9 et la résistance au choc au mouton est supérieure à 500g/mil. Les polyéthylènes présentent une répartition des compositions relativement large ainsi qu'une répartition des poids moléculaires relativement large.

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