Patent ID: 6333086
Filing Date: 2001-12-25
Classification: B32B,Y10T

Abstract:
A multilayered polymer film structure for use as a barrier layer in packages, consisting essentially of:at least one first layer containing a polyolefin;at least one second layer arranged adjacent to said first layer and containing a liquid crystalline polymer, the second layer consisting essentially of a compounded and compatibilized polymer blend formed by the liquid crystalline polymer, a polyolefin and a compatibilizer, the liquid crystalline polymer of the second layer forming a continuous phase, the second layer having an oxygen transmission rate of less than 150 cm.sup.3 /(m.sup.2.multidot.d.multidot.bar), determined according to ASTM D 3985-81, and the integral film structure having a water vapour transmission rate of less than 10 g/(m.sup.2.multidot.24.multidot.h) at RH 80% 23.degree. C., determined according to ASTM F 1249-90, the second layer containing 60 to 99 parts by volume of the liquid crystalline polymer, 1 to 40 parts by volume of the polyolefin, and 0.1 to 5 parts by volume of the compatibilizer enhancing an interaction between the liquid crystalline polymer and the polyolefin, contents of the polymers and the compatibilizer being based upon total volume of the second layer; anda tie layer of maleic anhydride modified polyolefin that adheres the second layer to the first layer.