US 6,541,087 B1Granted

Multilayer, biaxially stretched, high-barrier plastic skin

AssigneeWolff Walsrode AG

InventorsDirk Pophusen, Nils Schröder

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Abstract

A multilayerd, biaxially stretched tubular film having the following sequence of layers, |A|B|C|D|E|F|G|, is described. Inner layer A contains at least one member selected from the group consisting of aliphatic (co)polyamide and partially aromatic (co)polyamide. Core layer E, consists essentially of at least one member selected from the group consisting of aliphatic (co)polyamide and partially aromatic (co)polyamide. Outer layer G contains at least one member selected from the group consisting of aliphatic (co)polyamide and partially aromatic (co)polyamide. Interlayer C is polyolefinic, has water vapor barrier properties, and is interposed between inner layer A and core layer E. Interlayer C is directly attached to layer A via coupling layer B and to layer E via coupling layer D. Coupling layers B and F each independently contain a modified polyolefin. Interior layer F has oxygen barrier properties, and is interposed between outer layer G and core layer E. The composition of inner layer A, core layer E and outer layer G are each independent one from the other.

Claims11

Dependent claims

A multilayered, biaxially stretched tubular film comprising layers A,B,C,D,E, F and G wherein

a) 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.

4 more elements

Dependencies are inferred from the claim text.

Facts

Application: 09/660,076Filed 11 Sep 2000
Priority: DE 199 43 91014 Sep 1999
Granted: 1 Apr 2003
Term ends: Not estimatedThe source records don’t support an estimate.

Classification30 codes

B32B 27/08
As the main or only constituent of a layer, which is next to another layer of the same or of a different material: of synthetic resin
A22C 13/0013
Sausage casings: chemical composition of synthetic sausage casings
B29C 55/28
Shaping by stretching, e.g. drawing through a die; Apparatus therefor: of blown tubular films, e.g. by inflation
B32B 1/08
Layered products having a non-planar shape: tubular products