Patent ID: 6555242
Filing Date: 2003-04-29
Classification: B32B,C23C,Y10T

Abstract:
A longitudinally stretched multilayered film prepared by a process comprising(a) preparing by coextrusion a laminate structured of, in sequence, a first polyamide layer, an EVOH layer, and a second polyamide layer, and (b) longitudinally stretching the laminate prepared in (a) at a stretching ratio of 1.5:1 to 8:1, to produce a stretched laminate and (c) applying by vacuum vapor deposition to one of the polyamide layers of said stretched laminate an inorganic layer that contains one or more members selected group consisting of elements of main groups 3 and 4 and subgroups 3 and 4 of the periodic system of elements and oxides of said elements, said EVOH layer having a thickness of 0.5 to 10 microns and ethylene content of 25 to 50% relative to the mols of EVOH, said first polyamide layer and said second polyamide layer each independent of the other having a thickness of 3 to 25 microns.