Recyclable film and packaging
AssigneeAmcor Flexibles North America, Inc.
InventorThomas A. Schell
Life of this patent
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Abstract
A recyclable film contains a base film and a sealant. The base film has at least one layer containing a polar polymer and at least one layer containing a polar polymer compatibilizer. Additionally, the base film has been oriented and annealed such that it exhibits free shrink of less than 10% in both the machine direction and the transverse direction when exposed to heat of 90° C. The film may be used for demanding retort processing applications. This film has advantages over prior recyclable films in efficient film manufacturing, high quality package production and superior package performance.
Claims14
A recyclable film comprising:
- a) a base film comprising:
- i) a first polar layer comprising a polar polymer, and
- ii) a compatibilizer layer comprising a blend of polypropylene and a low molecular weight anhydride or carboxylic acid functionalized polypropylene,
- b) an unoriented sealant, and
- c) a barrier layer selected from the group consisting of ethylene vinyl alcohol copolymer located in the base film or in the unoriented sealant, metalization located between the base film and the unoriented sealant, and a barrier coating located between the base film and the unoriented sealant, and
- d) optionally, printed indicia located between the base film and the unoriented sealant, and wherein the base film is oriented and annealed such that the base film has a free shrink value of less than 10% in both the machine direction and the transverse direction when tested according to ASTM D2732 using bath temperature of 90° C., and
- wherein the recyclable film has an oxygen transmission rate from about 0.16 to 1.6 cc/m2/day when tested at 23° C., and
- wherein the recyclable film is recyclable in a polypropylene waste stream.
A recyclable film comprising:
- a) a first exterior surface comprising a base film, wherein the base film is oriented,
- b) a second exterior surface comprising an unoriented sealant comprising polypropylene,
- c) a polar layer comprising a polar polymer, and
- d) a compatibilizer layer comprising a blend of polypropylene and a low molecular weight anhydride or carboxylic acid functionalized polypropylene, and
- e) a barrier layer between the first exterior surface and the second exterior surface, wherein the barrier layer is selected from the group consisting of ethylene vinyl alcohol copolymer, metalization and a barrier coating, and
- wherein the recyclable film has an oxygen transmission rate from about 0.16 to 1.6 cc/m2/day when tested at 23° C.
A recyclable film comprising a base film comprising:
- a) a first outer layer comprising a polyamide,
- b) a compatibilizer layer comprising,
- i) a polypropylene, polypropylene copolymer or blends thereof, and
- ii) a compatibilizer comprising a low molecular weight anhydride or carboxylic acid functionalized polypropylene,
- c) a first tie layer located between the first outer layer and the compatibilizer layer,
- d) a second outer layer comprising a polyamide,
- e) a second tie layer located between the compatibilizer layer and the second outer layer;
- and
- f) a barrier layer consisting of ethylene vinyl alcohol copolymer,
- wherein the base film is oriented, and
- wherein the recyclable film further comprises an unoriented sealant.
Dependencies are inferred from the claim text.