High mir linear polyethylenes and coextruded films made using such polyethylene

摘要

The invention relates to the use linear polyethylene having an MIR indicative of the presence of some long chain branching having a density of 0.91 to 0.94 g/cm3 determined according to ASTM D4703/D1505, an I2.16 (MI) of from 0.05 to 1 g/10 min, and I21.6/I2.16 (MIR) of more than 35, the MI and MIR being determined according to ASTM 1238 D at 190° C., and a difference between the MD Tensile force based on ASTM D882-02 at 100% elongation and MD 10% Offset yield of a reference film as defined herein having a thickness of 25μm of at least 15 MPa. The invention also relates to coextruded film structures made using such linear polyethylene in the core layer of a multi-layer structure to provide easily processes, strong, highly transparent films.