Multilayer films prepared from blends of high impact strength polyethylene and Ziegler-Natta catalyzed polyethylene with high pressure low density polyethylene

摘要

High impact strength polyethylene (HI polyethylene); multilayer films are prepared from Ziegler-Natta catalyzed polyethylene (Z / N polyethylene) and high pressure low density polyethylene (LD polyethylene). However, i) at least one skin layer consists essentially of HI polyethylene, and ii) at least one core layer comprises a blend of Z / N polyethylene and said LD polyethylene. The HI polyethylene has a density of about 0.915 to 0.930 g / cc and a normalized impact strength of at least 300 g / mil. The amount of HI polyethylene is 30-55% by weight (based on the total weight of HI + ZN + LD polyethylene). The film of the present invention is easily prepared on a Bron film apparatus and provides excellent balance of mechanical properties.