Patent ID: 6541087
Filing Date: 2003-04-01
Classification: A22C,B29C,B29L,B32B,B65D,Y10T

Abstract:
A multilayered, biaxially stretched tubular film comprising layers A,B,C,D,E, F and G whereina) a inner layer A contains at least one member selected from the group consisting of aliphatic (co)polyamide and partially aromatic (co)polyamide, and b) an core layer E, consists essentially of at least one member selected from the group consisting of aliphatic (co)polyamide and partially aromatic (co)polyamide, and c) an outer layer G contains at least one member selected from the group consisting of aliphatic (co)polyamide and partially aromatic (co)polyamide, and wherein d) an interlayer C is polyolefinic, has water vapor barrier properties, and is interposed between said inner layer A and core layer E, and wherein e) said interlayer C is directly attached to said layer A via courpling layer B and to layer E via coupling layer D, said coupling layers B and D comprising a modified polyolefin, and wherein f) an interior layer F having oxygen barrier properties is interposed between said outer layer G and core layer E, the composition of inner layer A, core layer E and outer layer G being independent of each other, said tubular film being prepared by double bubble process.