Polyethylene film having improved mechanical and barrier properties and method of making same

摘要

The invention relates to a polyethylene film comprising a polymer composition having:
(a) an "a" value of greater than about 0.45;
(b) an "eta zero" value of less than about 4×10 5 Pa.s; and
(c) a "tau eta" value of less than about 5 s,
when fitted to the Carreau-Yasuda equation with an n=0.1818 value and wherein the film displays a moisture vapour transmission rate equal to or less than about 0.85 g-mil/100 sq. in/day determined in accordance with ASTM F 1249 and a total energy dart drop impact of equal to or greater than about 1.0 ft.lbf as determined in accordance with ASTM D4272 when performed on a test specimen having a 0.8 mil thickness.