Recyclable metallized barrier films and bags for packaging flowable materials
AssigneeLiqui-Box Corporation
InventorsNicholas Farkas, Paul Georgelos
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Abstract
The disclosure provides co-extruded, multi-layer films, including metallized barrier films and non-barrier films, and articles of manufacture that include the films, such as flexible bags and containers for flowable materials. The films and articles that include the films have good heat retention, and barrier properties, as well as good flex-crak resistance and toughness. The films and articles that include the films have a metallized barrier core layer of ethylene-vinyl alcohol (EVOH) copolymer wherein both the metal and EVOH are in amounts that achieve the heat retention, flex-crack resistance, toughness, and barrier properties, while allowing for the recycling of the films and articles of manufacture.
Claims20
A recyclable bag having a metallized barrier co-extruded multi-layer polymeric film comprising:
- (i) an inner sealant layer comprising an ethylene/α-olefin interpolymer fraction having a density in the range of 0.894 to 0.924 g/cm3 in an amount of at least about 40-50% by weight or thickness of the total inner sealant layer;
- (ii) a core barrier layer comprising ethylene-vinyl alcohol (EVOH) comprising about 0.1% to about 10% by total weight or thickness of the metallized barrier co-extruded multi-layer polymeric film, wherein the EVOH comprises from about 27-55 mol % ethylene in the EVOH copolymer;
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- (iii) an outer metallized sealant layer comprising a polyethylene polymer, a polyethylene copolymer, or an ethylene/a-olefin interpolymer, having a density in the range of 0.894 to 0.935 g/cm3, in an amount of at least about 40-50% by weight or thickness of the total outer metallized sealant layer, and a material that increases metal adhesion.
Dependencies are inferred from the claim text.