Patent ID: 11970321
Assignee: LIQUIBOX CORPORATION
Field: Surface technology, coating (Chemistry)
Classification: CPC B  C  Y | IPC B

Claim 10:
11. A co-extruded multi-layer polymeric recyclable barrier film comprising seven layers, comprising:
(i) an inner sealant layer comprising an ethylene/α-olefin copolymer fraction having a density in the range of 0.894 to 0.920 g/cm3 in an amount of at least about 50% by weight or thickness of the total inner sealant layer, wherein the inner sealant layer has a total density in the range of from about 0.910 to 0.924 g/cm3;
(ii) a first and a second outer interposed layer, and
a first and a second inner interposed layer, wherein all the interposed layers comprise an ethylene/α-olefin copolymer fraction having a density in the range of 0.894 to 0.920 g/cm3 in an amount of at least about 50% by weight or thickness of the first interposed layer, wherein all the interposed layers have a total density in the range of from about 0.910 to 0.924 g/cm3, and wherein the first and second inner interposed layers comprise an adhesive or tie resin in an amount effective to improve adhesion of the first and the second inner interposed layer to at least one layer in the co-extruded multi-layer polymeric film;

(iii) a core barrier layer adjacent to and located between the first and the second inner interposed layers, the core barrier layer comprising ethylene-vinyl alcohol (EVOH) copolymer comprising about 0.1% to about 10% by total weight or thickness of the co-extruded multi-layer polymeric film, wherein the EVOH comprises at least 38% ethylene in the EVOH copolymer; and
(iv) an outer sealant layer comprising an ethylene/α-olefin copolymer fraction having a density in the range of 0.894 to 0.920 g/cm3 in an amount of at least about 50% by weight or thickness of the total outer sealant layer, wherein the outer sealant layer has a total density in the range of from about 0.910 to 0.924 g/cm3.