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.
Claims36
A recyclable bag for packaging flowable materials comprising a recyclable metallized barrier co-extruded multi-layer polymeric film and a non-barrier co-extruded multi-layer polymeric film, wherein the metallized barrier co-extruded multi-layer polymeric film comprises:
- (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 co-extruded multi-layer polymeric film, wherein the EVOH comprises from about 27-55% ethylene in the EVOH copolymer;
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- (iii) an outer metallized sealant layer comprising a polyethylene, or a copolymer or an ethylene/α-olefin interpolymer fraction 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 an ethylene vinyl acetate (EVA) resin.
A recyclable bag for packaging flowable materials comprising a recyclable metallized barrier co-extruded multi-layer polymeric film and a non-barrier co-extruded multi-layer polymeric film, wherein the metallized barrier co-extruded multi-layer polymeric film comprises five layers:
- (i) an inner sealant layer comprising a copolymer or 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 first and a second interposed layer comprising a copolymer or 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 50% by weight or thickness of the first interposed layer, and an optional adhesive or tie resin in an amount effective to improve adhesion of the first and the second interposed layer to at least one other layers in the co-extruded multi-layer polymeric film, wherein the first and the second interposed layer has a total density in the range of from about 0.910 to 0.924 g/cm3;
- (iii) a core barrier layer comprising ethylene-vinyl alcohol (EVOH) comprising about 0.1% to about 10% by total weight or thickness of the co-extruded multi-layer polymeric film, wherein the EVOH comprises from about 27-55% ethylene in the EVOH copolymer;
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- (iv) an outer sealant metallized layer comprising a polyethylene, or a copolymer or an ethylene/α-olefin interpolymer fraction 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 an ethylene vinyl acetate (EVA) resin.
A recyclable bag for packaging flowable materials comprising a recyclable metallized barrier co-extruded multi-layer polymeric film and a non-barrier co-extruded multi-layer polymeric film, wherein the metallized barrier co-extruded multi-layer polymeric film comprises:
- (i) an inner sealant layer comprising a copolymer or 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 first and a second interposed layer comprising a copolymer or 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 first interposed layer, and an optional adhesive or tie resin in an amount effective to improve adhesion of the first and the second interposed layer to at least one other layers in the co-extruded multi-layer polymeric film, wherein the first and the second interposed layer has a total density in the range of from about 0.910 to 0.924 g/cm 3;
- (iii) at least two identical core barrier layers, wherein the first of the at least two core barrier layers is adjacent to the first interposed layer and the second of the at least two core barrier layers is adjacent to the second interposed layer, wherein the at least two core barrier layers are separated from each other by at least one layer comprising an ethylene/α-olefin interpolymer with an optional tie resin, wherein each of the core barrier layers comprise ethylene-vinyl alcohol (EVOH) comprising about 0.1% to about 5% by total weight or thickness of the co-extruded multi-layer polymeric film, and wherein the EVOH comprises from about 27-55% ethylene in the EVOH copolymer;
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- (iv) an outer metallized sealant layer comprising a polyethylene, or a copolymer or an ethylene/α-olefin interpolymer fraction 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 an ethylene vinyl acetate (EVA) resin.
Dependencies are inferred from the claim text.