Multilayer laminated film having an improved gas barrier action

Details Multilayer laminated film having an improved gas barrier action Multilayer laminated film having an improved gas barrier action

1992-07-10

1994-06-28

Buffalow, Edith

Stock material or miscellaneous articles

Structurally defined web or sheet

Including components having same physical characteristic in...

428515, 428518, 4284735, 42891O, B32B 702

Patent

active

053245725

ABSTRACT:
Production or multilayer laminated films which can be subjected to thermoplastic shaping and have an improved gas barrier action, consisting of at least one gas barrier film based on highly hydrolyzed, plasticizer-containing polyvinyl alcohol with, on one side or both sides, covering films of plastic which are insoluble in water, impermeable to water and water vapor and if appropriate insoluble in organic solvents and which are laminated to the gas barrier film over the entire surface by means of special adhesive layers which have pressure-sensitive adhesive properties. The adhesive layers consist of copolymers having a glass transition temperature T.sub.G in the range from -50.degree. to -10.degree. C. The gas barrier film can be produced by extrusion blow molding. The blown film bubble is cut open and coated, at room temperature as a flat film, with the adhesive layer on both sides via applicator rolls, dried and deshrunk by conditioning. The resulting self-adhesive gas barrier film is then laminated with covering films of plastic by means of laminating rolls or on a calender to give a multilayer film laminate which is practically impermeable to water and gas and if appropriate solvent-tight.
Use of the multilayer laminated films for water- and gas-tight, in particular oxygen-tight, water vapor-tight, aroma-tight and if appropriate solvent-tight packaging or wrapping of various products.

REFERENCES:
patent: 4239826 (1980-12-01), Knott et al.

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