Polyethylene films with improved physical properties

Details Polyethylene films with improved physical properties Polyethylene films with improved physical properties

2005-10-18

2005-10-18

Kruer, Kevin R. (Department: 1773)

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Polymers from only ethylenic monomers or processes of...

C526S348000, C526S348100, C526S348500, C526S943000, C428S212000, C428S220000, C428S523000, C428S910000, C264S176100, C264S209500, C264S211200

Reexamination Certificate

active

06956088

ABSTRACT:
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.

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