# US 10,766,236 B2 · Multilayer sealing film and film laminate comprising a multilayer sealing film > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,766,236 B2 - Document ID: US10766236B2 - Status: Granted - Kind: B2 - Application number: 16/080,935 - Filed: 2016-03-14 - Published: 2019-03-28 - Granted: 2020-09-08 - Earliest claimed: 2016-03-14 - Assignees: Constantia Pirk GmbH & Co. KG - Applicants: Constantia Pirk GmbH & Co. KG - Inventors: Achim Grefenstein; Werner Geitner; Ingo Geillersdörfer - Web page: https://patentgrep.com/patent/US10766236B2 ## CPC - B32B 27/32: comprising polyolefins {(comprising vinyl (co)polymers or acrylic (co)polymers B32B27/30)} - B32B 3/30: characterised by a layer formed with recesses or projections, e.g. {hollows, grooves, protuberances, ribs (apertured layer B32B3/266; layer with cavities or internal voids B32B3/26)} - B32B 7/12: using interposed adhesives or interposed materials with bonding properties - B32B 27/08: of synthetic resin - B65D 75/26: Articles or materials wholly enclosed in laminated sheets or wrapper blanks - C08J 5/18: Manufacture of films or sheets - C09J 7/30: characterised by the adhesive composition - C09K 3/10: {Materials in mouldable or extrudable form} for sealing or packing joints or covers (filling pastes C09D5/34) - B32B 2250/03: 3 layers - B32B 2250/242: All polymers belonging to those covered by group B32B27/32 - B32B 2307/31: Heat sealable - B32B 2307/514: Oriented - B32B 2307/746: Slipping, anti-blocking, low friction - B32B 2307/75: Printability - C08J 2323/04: Homopolymers or copolymers of ethene - C08J 2323/06: Polyethene - 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 - C08J: WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H (working, e.g. shaping, of plastics B29) - C09J: ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES (preparation of glue or gelatine C09H) - C09K: MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE ## Abstract In order to improve the sealing properties and the sliding properties of a sealing film, surface structures are provided on a first side of the sealing film, the greatest thickness of the sealing film being at least 10% greater than the smallest thickness of the sealing film and the greatest lateral extension of the surface structures being less than 500 μm. A slip additive is added to the sealing film in a maximum quantity that results in an S-value of less than 10,000, preferably less than 5,000, in order to achieve a COF relative to steel of dynamically less than 0.3, preferably less than 0.27, and statically less than 0.35, preferably less than 0.3, with the side comprising the surface structures, irrespective of an addition of an antiblock additive to the sealing film. ## Claims ### Claim 1 A multilayer sealing film comprising a sealable polymer, wherein, surface structures provided on a first side of the multilayer sealing film in areas where sealing takes place increase compressibility of the multilayer sealing film, such that during sealing adjoining multilayer sealing films are pressed together and compressed to avoid formation of air channels, and the multilayer sealing film has a thickness prior to introduction of the surface structures in a range of 10 μm to 100 μm, and a total of the S-values for each layer of the multilayer sealing film is less than 10,000, the S-value of each layer defined as a product of a thickness of the layer in micrometer and an amount of slip additive in the layer in parts per million, and the multilayer sealing film has a COF relative to steel of dynamically less than 0.3, with the side comprising the surface structures, irrespective of an addition of an antiblock additive to the multilayer sealing film. ### Claim 2 (depends on 1) The multilayer sealing film according to claim 1, wherein, as a result of the surface structures, a greatest thickness of the multilayer sealing film is at least 10% greater than a smallest thickness of the multilayer sealing film, and a greatest lateral extension of the surface structures is less than 500 μm. ### Claim 3 (depends on 2) The multilayer sealing film according to claim 2, wherein the greatest thickness of the multilayer sealing film is at most 300% greater than the smallest thickness of the multilayer sealing film. ### Claim 4 (depends on 2) The multilayer sealing film according to claim 2, wherein the greatest lateral extension of the surface structures is less than 400 μm. ### Claim 5 (depends on 1) The multilayer sealing film according to claim 1, wherein the multilayer sealing film is manufactured without adding a slip additive. ### Claim 6 (depends on 1) The multilayer sealing film according to claim 1, wherein the surface structures are oriented so as to be diagonal to a longitudinal direction of the multilayer sealing film. ### Claim 7 (depends on 1) The multilayer sealing film according to claim 1, wherein the surface structures are formed so as to protrude from the first side of the multilayer sealing film. ### Claim 8 (depends on 1) The multilayer sealing film according to claim 1, wherein the surface structures are formed as depressions on the first side of the multilayer sealing film. ### Claim 9 (depends on 1) The multilayer sealing film according to claim 1, wherein the surface structures are formed having a base surface in the shape of a polygon comprising at least six sides. ### Claim 10 (depends on 1) The multilayer sealing film according to claim 1, wherein regions without surface structures or having different surface structures, in particular in the form of a logo or inscription, are provided in the multilayer sealing film, on the side comprising the surface structures. ### Claim 11 (depends on 1) The multilayer sealing film according to claim 1, wherein the multilayer sealing film comprises a polyethylene film produced in a blown film extrusion or flat film extrusion method. ### Claim 12 (depends on 1) The multilayer sealing film according to claim 1, wherein the multilayer sealing film is free of antiblock additives. ### Claim 13 (depends on 1) A film laminate comprising a substrate layer, and a multilayer sealing film according to claim 1 that forms a multilayer sealing layer, wherein the surface structures are formed on the first side of the multilayer sealing film and the opposing second side of the multilayer sealing film is bonded to the substrate layer. ### Claim 14 (depends on 13) The film laminate according to claim 13, wherein the substrate layer and the sealing layer are bonded to one another by means of an adhesive layer. ### Claim 15 (depends on 13) The film laminate according to claim 13, wherein the sealing layer is extruded onto the substrate layer. ### Claim 16 (depends on 13) The film laminate according to claim 13, wherein the substrate layer comprises a base layer. ### Claim 17 (depends on 13) The film laminate according to claim 13, wherein the substrate layer comprises a base layer and a barrier layer, the barrier layer being arranged between the base layer and the sealing layer. ### Claim 18 (depends on 13) A packaging produced from a film laminate according to claim 13, wherein the packaging is produced by folding and sealing the film laminate. ### Claim 19 (depends on 18) The packaging according to claim 18, characterized in that the folding and sealing results in overlapping sealed seams, in that surface structures are formed on the multilayer sealing film at least at regions at which sealing takes place, and in that, upon sealing, adjacent film laminates comprising the multilayer sealing film are pressed together and compressed, in particular in the overlap region of a plurality of sealed seams, in order to prevent the formation of air channels in the overlap region. ### Claim 20 (depends on 13) A packaging produced using a film laminate according to claim 13, wherein the packaging is formed as a container comprising a peripheral edge onto which a lid produced from the film laminate is sealed.