# US 2025/0145352 A1 · Resealable film > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2025/0145352 A1 - Document ID: US20250145352A1 - Status: Published application - Kind: A1 - Application number: 19/014,496 - Filed: 2025-01-09 - Published: 2025-05-08 - Earliest claimed: 2019-09-12 - Assignees: Sonoco Development, Inc. - Applicants: Sonoco Development, Inc. - Inventors: Scott William Huffer; Rod Pettis - Web page: https://patentgrep.com/patent/US20250145352A1 ## CPC - B32B 1/00: Layered products having a non-planar shape - B65D 65/40: Applications of laminates for particular packaging purposes {(B65D1/0215, B65D1/28, B65D3/22, B65D5/0281, B65D5/563, B65D9/30, B65D29/02, B65D31/02, B65D75/26, B65D77/2024, B65D81/1275, B65D81/3811, B65D81/3823, B65D81/3834, B65D81/3846, B65D81/3858, B65D81/3874, B65D81/3886, B65D81/3897 take precedence; laminates per se or laminated packages characterised by the composition or)} - B32B 7/06: permitting easy separation - B32B 7/12: using interposed adhesives or interposed materials with bonding properties - B32B 27/08: of synthetic resin - B32B 27/16: specially treated, e.g. irradiated - B32B 27/306: {comprising vinyl acetate or vinyl alcohol (co)polymers} - B32B 27/32: comprising polyolefins {(comprising vinyl (co)polymers or acrylic (co)polymers B32B27/30)} - B65D 77/2096: {Adhesive means} - B32B 2250/24: All layers being polymeric - B32B 2307/31: Heat sealable - B32B 2307/546: Flexural strength; Flexion stiffness - B32B 2307/748: Releasability - B32B 2307/75: Printability - B32B 2405/00: Adhesive articles, e.g. adhesive tapes - B32B 2435/02: for containers - B32B 2581/00: Seals; Sealing equipment; Gaskets - B32B: LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM - B65D: CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES ## Abstract The present invention relates to a resealable container comprising: a polyethylene terephthalate-based container body comprising a bottom side and at least one upwardly extending sidewall, wherein the sidewall terminates in an open end of the container; a flexible film sealed to the container body, over the open end of the container, wherein the flexible film comprises: a polyethylene-based first film layer; a pressure sensitive adhesive layer adjacent a lower surface of the first film layer; a polyolefin plastomer skin layer adjacent a lower surface of the pressure sensitive adhesive layer, wherein the first layer, pressure sensitive adhesive layer, and skin layer are coextruded; and a heat seal layer printed onto a lower surface of the skin layer and heat sealed to the container body. ## Claims ### Claim 1 A resealable flexible film comprising: a polyethylene-based first film layer; a pressure sensitive adhesive layer adjacent the first film layer; a polyolefin plastomer skin layer adjacent the pressure sensitive adhesive layer, opposite the polyethylene-based first film layer, and a polyethylene terephthalate-compatible heat seal layer disposed on the skin layer, opposite the pressure sensitive adhesive layer. ### Claim 2 (depends on 1) The resealable flexible film of claim 1 wherein the first film layer, the pressure sensitive adhesive layer, and the skin layer are coextruded. ### Claim 3 (depends on 2) The resealable flexible film of claim 2 wherein the coextruded film is a blown film. ### Claim 4 (depends on 2) The resealable flexible film of claim 2 wherein the coextruded film is a cast film. ### Claim 5 (depends on 1) The resealable flexible film of claim 1 wherein the first film layer and the pressure sensitive adhesive layer are coextruded and the skin layer is extrusion coated onto the coextruded layer. ### Claim 6 (depends on 1) The resealable flexible film of claim 1 wherein the skin layer comprises ethylene-vinyl acetate. ### Claim 7 (depends on 1) The resealable flexible film of claim 1 wherein the skin layer comprises a low seal initiation copolymer. ### Claim 8 (depends on 1) The resealable flexible film of claim 1 wherein the skin layer comprises a long-chain branched, metallocene-catalyzed homogeneous ethylene/alpha-olefin copolymer. ### Claim 9 (depends on 1) The resealable flexible film of claim 1 wherein the skin layer comprises at least one polymer designed to weaken the affinity of the skin layer for the pressure sensitive adhesive layer. ### Claim 10 (depends on 1) The resealable flexible film of claim 1 wherein the heat seal layer is printed onto the skin layer. ### Claim 11 (depends on 1) The resealable flexible film of claim 1 wherein the heat seal layer comprises a thermally activatable adhesive composition. ### Claim 12 (depends on 1) The resealable flexible film of claim 1 wherein the heat seal layer comprises a hot melt adhesive resin. ### Claim 13 (depends on 1) The resealable flexible film of claim 1 wherein the heat seal layer comprises polyethylene terephthalate or amorphous polyethylene terephthalate. ### Claim 14 (depends on 1) The resealable flexible film of claim 1 wherein the affinity between the skin layer and the heat seal layer is greater than the affinity between the skin layer and the pressure sensitive layer. ### Claim 15 (depends on 1) The resealable flexible film of claim 1 wherein the polyethylene-based first film layer comprises high density polyethylene terephthalate. ### Claim 16 (depends on 1) The resealable flexible film of claim 1 additionally comprising a polyethylene terephthalate-based container to which the resealable flexible film is heat sealed. ### Claim 17 (depends on 16) The resealable flexible film of claim 16 wherein the resealable flexible film is heat sealed to the edge, rim, or flange of the polyethylene terephthalate-based container. ### Claim 18 (depends on 16) The resealable flexible film of claim 16 wherein the polyethylene terephthalate-based container comprises polyethylene terephthalate, amorphous polyethylene terephthalate, crystallized polyethylene terephthalate, reinforced polyethylene terephthalate, glycol-modified polyethylene terephthalate, isophthalic acid, or oriented polyethylene terephthalate. ### Claim 19 (depends on 16) The resealable flexible film of claim 16 wherein the resealable flexible film comprises microperforations or macroperforations.