Bag-in-box film for packaging refrigerated liquids
AssigneeLiqui-Box Corporation
InventorNicholas Farkas
Life of this patent
Estimating the term…
Abstract
Multi-layer films for making bags for containing flowable materials, in particular to large bags for dairy products. The multi-layer films have an outer and an inner sealant layer and a core layer and optionally, an interposed layer positioned between the outer sealant layer and the core layer and between the core layer and the inner sealant layer. The outer and inner sealant layers contain an ethylene/α-olefin interpolymer composition and the intermediate layer optionally contains this interpolymer composition.
Claims15
A multilayer film for making pouches containing flowable materials, said multi-layer film comprising the following layers in order, from an at least one inner sealant-layer to at least one core layer and to an at least one outer sealant-layer for packaging liquids comprising:
- (A) at least one outer sealant layer and at least one inner sealant layer, each layer comprising an ethylene/α-olefin interpolymer composition that comprises from 50-75% by weight of a first ethylene/α-olefin copolymer fraction having a density in the range of 0.894 to 0.908 g/cc;
- a melt index in the range of 0.2 to 1 g/10 min;
- and from 25 to 50 percent by weight of a second ethylene/α-olefin copolymer fraction and wherein the interpolymer has a density in the range of 0.910 to 0.924 g/cc and a melt index in the range from 0.5 to 2 g/10 min;
- a zero shear viscosity ratio (ZSVR) in the range of from 1.15 to 2.5;
- a molecular weight distribution, expressed as the ratio of the weight average molecular weight (Mw/Mn), in the range of 2.0 to 4.0;
- (B) at least one core layer selected from the group consisting of:
- (1) a core layer comprising linear low density polyethylene, ethylene/octene-1 copolymer having a melt index of 1.0 g/10 min and a density of 0.916 g/cc;
- (2) a core layer comprising 30-100% by weight of linear low density polyethylene, ethylene/octene-1 copolymer having a melt index of 1.0 g/10 min and a density of 0.916 g/cc and 70-0% of ethylene/butene copolymer having a melt index of 1.0 g/10 min and a density of 0.918 g/cc;
- and
- (3) a core layer comprising 30-100% by weight of linear low density polyethylene, ethylene/hexene-1 copolymer having a melt index of 1.0 g/10 min and density of 0.916 g/cc and 70-0% by weight of a linear low density ethylene/butene copolymer having a melt index of 1.0 g/10 min. and a density of 0.918 g/cc;
- wherein the multilayer film exhibits no reduction in toughness and seal strength at temperatures ranging from 0-10° C. to ambient temperatures, when formed as a pouch, as determined by a Bruceton Stair bag drop test.
A multilayer film for making pouches containing flowable materials, said multi-layer film comprising the following layers in order, from an at least one inner sealant-layer to a first interposed layer to an at least one core layer to a second interposed layer and to an outer sealant-layer for packaging liquids comprising:
- (A) at least one outer sealant layer and at least one inner sealant layer, each layer comprising an ultra-low density polyethylene, ethylene/octene-1 copolymer having a melt index of 0.85 g/10 min and a density of 0.912 g/cc and an ethylene/α-olefin interpolymer composition comprising linear low density polyethylene, ethylene/octene-1 copolymer having a melt index of 0.85 g/10 min and a density of 0.920 g/cc;
- (B) the first interposed layer between the at least one core layer and the at least one outer sealant layer and the second interposed layer between the at least one core layer and the second outer sealant layer, each interposed layer comprising an ethylene/α-olefin interpolymer composition that comprises from 50-75% by weight of a first ethylene/α-olefin copolymer fraction having a density in the range of 0.894 to 0.908 g/cc;
- a melt index in the range of 0.2 to 1 g/10 min;
- and from 25 to 50 percent by weight of a second ethylene/α-olefin copolymer fraction and wherein the interpolymer has a density in the range of 0.910 to 0.924 g/cc and a melt index in the range from 0.5 to 2 g/10 min;
- a zero shear viscosity ratio (ZSVR) in the range of from 1.15 to 2.5;
- a molecular weight distribution, expressed as the ratio of the weight average molecular weight (Mw/Mn), in the range of 2.0 to 4.0;
- (C) at least one core layer selected from the group consisting of:
- (1) a core layer comprising linear low density polyethylene, ethyleneloctene-1 copolymer having a melt index of 1.0 g/10 min and a density of 0.916 g/cc;
- (2) a core layer comprising 30-100% by weight of linear low density polyethylene, ethylene/octene-1 copolymer having a melt index of 1.0 g/10 min and a density of 0.916 g/cc and 70-0% of ethylene/butene copolymer having a melt index of 1.0 g/10 min and a density of 0.918 g/cc;
- and
- (3) a core layer comprising 30-100% by weight of linear low density polyethylene, ethylene/hexene-1 copolymer having a melt index of 1.0 g/10 min and density of 0.916 g/cc and 70-0% by weight of linear low density polyethylene, ethylene/butene copolymer having a melt index of 1.0 g/10 min and a density of 0.918 g/cc;
- wherein the multilayer film exhibits no reduction in toughness and seal strength at temperatures ranging from 0-10° C. to ambient temperatures, when formed as a pouch, as determined by a Bruceton Stair bag drop test.
Dependencies are inferred from the claim text.