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US 6,555,242 B2Granted
Longitudinally stretched, vacuum vapor coated packaging films
AssigneeWolff Walsrode AG
InventorsAntoine Cassel, Rainer Brandt, Gregor Kaschel
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Abstract
A longitudinally stretched multilayered film having good barrier properties is described. The film is 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 and (c) applying by vacuum vapor deposition to one of the surfaces of the stretched laminate an inorganic layer.
Claims8
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.
1 more element
A longitudinally stretched multilayered film prepared by a process consisting essentially of:
- (a) preparing by coextrusion a laminate structured of, in sequence, a first polyamide layer, a gas barrier layer, and a second polyamide layer, and
- (b) longitudinally stretching the laminate prepared in (a) at a stretching ratio of 2:1 to 5:1, to produce a stretched laminate and
- (c) applying by vacuum vapor deposition to one of the surfaces of said stretched laminate an inorganic layer that contains one or more members selected from the 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,
- wherein, said gas barrier layer is an EVOH layer having a thickness of 1 to 5 microns and ethylene content of 25 to 50% relative to the mols of EVOH, and said first polyamide layer and said second polyamide layer each independent of the other having a thickness of 5 to 10 microns.
1 more element
Dependencies are inferred from the claim text.