# US 2025/0375960 A1 · Multilayer packaging films > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2025/0375960 A1 - Document ID: US20250375960A1 - Status: Published application - Kind: A1 - Application number: 18/873,671 - Filed: 2022-06-24 - Published: 2025-12-11 - Earliest claimed: 2022-06-24 - Assignees: Amcor Flexibles North America, Inc. - Applicants: Amcor Flexibles North America, Inc. - Inventors: Philipp OKLE; Peter ETTRIDGE; Wolfgang LOHWASSER; Roy CHRISTOPHERSON - Web page: https://patentgrep.com/patent/US20250375960A1 ## CPC - B32B 27/32: comprising polyolefins {(comprising vinyl (co)polymers or acrylic (co)polymers B32B27/30)} - B32B 7/12: using interposed adhesives or interposed materials with bonding properties - B32B 27/08: of synthetic resin - B32B 27/306: {comprising vinyl acetate or vinyl alcohol (co)polymers} - B32B 2250/03: 3 layers - B32B 2250/24: All layers being polymeric - B32B 2250/242: All polymers belonging to those covered by group B32B27/32 - B32B 2250/246: All polymers belonging to those covered by groups B32B27/32 and B32B27/30 - B32B 2255/06: on metal layer - B32B 2255/10: on synthetic resin layer or on natural or synthetic rubber layer - B32B 2255/20: Inorganic coating - B32B 2260/046: Synthetic resin - B32B 2270/00: Resin or rubber layer containing a blend of at least two different polymers - B32B 2272/00: Resin or rubber layer comprising scrap, waste or recycling material - B32B 2307/306: Resistant to heat - B32B 2307/308: Heat stability - B32B 2307/31: Heat sealable - B32B 2307/40: having particular optical properties - B32B 2307/514: Oriented - B32B 2307/516: mono-axially - B32B 2307/518: bi-axially - B32B 2307/7242: Non-permeable - B32B 2307/7244: Oxygen barrier - B32B 2307/732: Dimensional properties - B32B 2307/736: Shrinkable - B32B 2323/10: Polypropylene - B32B 2439/06: Bags, sacks, sachets - B32B 2439/70: Food packaging - B32B: LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM ## Abstract This disclosure concerns a multilayer packaging film having a first base layer, a second base layer on the first base layer, and a sealing layer on the second base layer. In some embodiments, a shrinkage value of the second base layer is less than a shrinkage value of the first base layer. In some embodiments, the shrinkage value of the second base layer is greater than or equal to a shrinkage value of the first base layer. In some embodiments, the second base layer has a shrinkage value that is greater than 5%, and the shrinkage value of the second base layer is less than a shrinkage value of the first base layer. Also disclosed are methods of producing multilayer packaging films and hermetically sealed packages (e.g., thermoformed trays or cups and retort pouches) formed from the multilayer packaging film. ## Claims ### Claim 1 A multilayer packaging film comprising: a first base layer comprising a polyolefin film; a second base layer on the first base layer, the second base layer comprising a polyolefin film; and a sealing layer on the second base layer, the sealing layer comprising a polyolefin film, wherein one or more of the first base layer or the second base layer comprises an inorganic coating thereon, and wherein the second base layer has a shrinkage value that is greater than 5% measured using the method disclosed in ASTM D2732-03. ### Claim 2 (depends on 1) The multilayer packaging film according to claim 1, wherein the shrinkage value of the second base layer is greater than or equal to a shrinkage value of the first base layer. ### Claim 3 (depends on 1) The multilayer packaging film according to claim 1, wherein the shrinkage value of the second base layer is greater than or equal to a shrinkage value of the sealing layer. ### Claim 4 A multilayer packaging film comprising: a first base layer comprising a polyolefin film; a second base layer on the first base layer, the second base layer comprising a polyolefin film; and a sealing layer on the second base layer, the sealing layer comprising a polyolefin film, wherein one or more of the first base layer or the second base layer comprises an inorganic coating thereon, and a shrinkage value of the second base layer is less than a shrinkage value of the first base layer. ### Claim 5 (depends on 4) The multilayer packaging film according to claim 4, wherein the second base layer has a shrinkage value that is less than or equal to 5% measured using the method disclosed in ASTM D2732-03. ### Claim 6 (depends on 4) The multilayer packaging film according to claim 4, wherein the shrinkage value of the second base layer is greater than or equal to a shrinkage value of the sealing layer. ### Claim 7 A multilayer packaging film comprising: a first base layer comprising a polyolefin film; a second base layer on the first base layer, the second base layer comprising a polyolefin film; and a sealing layer on the second base layer, the second base layer comprising a polyolefin film, wherein one or more of the first base layer or the second base layer comprises an inorganic coating thereon, wherein the second base layer has a shrinkage value that is greater than 5% measured using the method disclosed in ASTM D2732-03, and the shrinkage value of the second base layer is less than a shrinkage value of the first base layer. ### Claim 8 (depends on 7) The multilayer packaging film according to claim 7, wherein the shrinkage value of the second base layer is greater than or equal to a shrinkage value of the sealing layer. ### Claim 9 (canceled) ### Claim 10 (depends on 1) The multilayer packaging film according to claim 1, wherein the difference in shrinkage value of the first base layer and the second base layer is greater than or equal to 0.3%. ### Claim 11 (depends on 1) The multilayer packaging film according to claim 1, wherein the difference in shrinkage value of the second base layer and the sealing layer is greater than or equal to 0.5%. ### Claim 12 (depends on 1) The multilayer packaging film according to claim 1, wherein the shrinkage value of the sealing layer is greater than or equal to 2%. ### Claim 13 (depends on 1) The multilayer packaging film according to claim 1, wherein the shrinkage value of each of the first base layer, the second base layer, and the sealing layer is measured in a machine direction (MD) according to Formula 1: MD ⁡ ( before ⁢ heating ) - MD ⁡ ( after ⁢ heating ) MD ⁡ ( before ⁢ heating ) ⋆ 1 ⁢ 0 ⁢ 0 ( 1 ) ### Claim 14 (depends on 1) The multilayer packaging film according to claim 1, wherein the shrinkage value of each of the first base layer, the second base layer, and the sealing layer is measured using the method disclosed in ASTM D2732-03. ### Claim 15 (depends on 1) The multilayer packaging film according to claim 1, wherein the shrinkage value of each of the first base layer, the second base layer, and the sealing layer is measured after heating at 120° C. for 15 minutes. ### Claim 16 (depends on 1) The multilayer packaging film according to claim 1, wherein the shrinkage value of each of the first base layer, the second base layer, and the sealing layer is measured after heating at 127° C. for 50 minutes. ### Claim 17 (depends on 1) The multilayer packaging film according to claim 1, wherein the polyolefin film of each of the first base layer and the second base layer is an oriented polyethylene (OPE) film or an oriented polypropylene (OPP) film. ### Claim 18 (depends on 17) The multilayer packaging film according to claim 17, wherein one or more of the oriented polyethylene (OPE) film or the oriented polypropylene (OPP) film is formed by one or more of a sequential stretching process or a simultaneous stretching process. ### Claim 19 (depends on 18) The multilayer packaging film according to claim 18, wherein the simultaneous stretching process is one or more of a linear motor simultaneous stretching process, a double bubble process, or a triple bubble process. ### Claim 20 (depends on 17) The multilayer packaging film according to claim 17, wherein the polyolefin film comprises a biaxially oriented polypropylene (BOPP) film. ### Claim at position 21 -34. (canceled) ### Claim 35 (depends on 1) A retort pouch formed from the multilayer packaging film according to claim 1.