Multilayer laminated film having an improved gas barrier action
First Claim
1. A multilayer laminated film which can be subjected to thermoplastic shaping and has an improved gas barrier action, consisting of at least one gas barrier film based on polyvinyl alcohol (PVAL) which is laminated on at least one side with a polymer film which is water-insoluble and optionally insoluble in organic solvents as a barrier layer against water and water vapor, optionally for the multilayer laminated film to comprise several identical or different gas barrier films having intermediate layers of polymer films which block water and water vapor, wherein the gas barrier film comprises highly hydrolyzed PVAL and is laminated on at least one side with the polymer film(s) which block(s) water and water vapor and is/are water-insoluble and optionally insoluble in organic solvents via an adhesive layer which has pressure-sensitive adhesive properties and is impermeable to water and water vapor.
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Accused Products
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 TG in the range from -50° to -10° 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.
29 Citations
8 Claims
- 1. A multilayer laminated film which can be subjected to thermoplastic shaping and has an improved gas barrier action, consisting of at least one gas barrier film based on polyvinyl alcohol (PVAL) which is laminated on at least one side with a polymer film which is water-insoluble and optionally insoluble in organic solvents as a barrier layer against water and water vapor, optionally for the multilayer laminated film to comprise several identical or different gas barrier films having intermediate layers of polymer films which block water and water vapor, wherein the gas barrier film comprises highly hydrolyzed PVAL and is laminated on at least one side with the polymer film(s) which block(s) water and water vapor and is/are water-insoluble and optionally insoluble in organic solvents via an adhesive layer which has pressure-sensitive adhesive properties and is impermeable to water and water vapor.
Specification