EP4294635A1 - Composites multicouches de films imprimés - Google Patents

Composites multicouches de films imprimés

Info

Publication number
EP4294635A1
EP4294635A1 EP22706808.7A EP22706808A EP4294635A1 EP 4294635 A1 EP4294635 A1 EP 4294635A1 EP 22706808 A EP22706808 A EP 22706808A EP 4294635 A1 EP4294635 A1 EP 4294635A1
Authority
EP
European Patent Office
Prior art keywords
layer
polyurethane
polymeric layer
adhesive
composite according
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
EP22706808.7A
Other languages
German (de)
English (en)
Inventor
Joerg Buechner
Harald Kraus
Thomas FAIT
Christoph Thiebes
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Covestro Deutschland AG
Original Assignee
Covestro Deutschland AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Covestro Deutschland AG filed Critical Covestro Deutschland AG
Publication of EP4294635A1 publication Critical patent/EP4294635A1/fr
Pending legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
    • B32B7/04—Interconnection of layers
    • B32B7/12—Interconnection of layers using interposed adhesives or interposed materials with bonding properties
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J5/00—Manufacture of articles or shaped materials containing macromolecular substances
    • C08J5/12—Bonding of a preformed macromolecular material to the same or other solid material such as metal, glass, leather, e.g. using adhesives
    • C08J5/124—Bonding of a preformed macromolecular material to the same or other solid material such as metal, glass, leather, e.g. using adhesives using adhesives based on a macromolecular component
    • C08J5/127—Aqueous adhesives
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B15/00—Layered products comprising a layer of metal
    • B32B15/04—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B32B15/08—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B15/00—Layered products comprising a layer of metal
    • B32B15/04—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B32B15/08—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin
    • B32B15/09—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin comprising polyesters
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B15/00—Layered products comprising a layer of metal
    • B32B15/20—Layered products comprising a layer of metal comprising aluminium or copper
    • B—PERFORMING OPERATIONS; TRANSPORTING
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    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B23/00—Layered products comprising a layer of cellulosic plastic substances, i.e. substances obtained by chemical modification of cellulose, e.g. cellulose ethers, cellulose esters, viscose
    • B32B23/04—Layered products comprising a layer of cellulosic plastic substances, i.e. substances obtained by chemical modification of cellulose, e.g. cellulose ethers, cellulose esters, viscose comprising such cellulosic plastic substance as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B32B23/042—Layered products comprising a layer of cellulosic plastic substances, i.e. substances obtained by chemical modification of cellulose, e.g. cellulose ethers, cellulose esters, viscose comprising such cellulosic plastic substance as the main or only constituent of a layer, which is next to another layer of the same or of a different material of metal
    • B—PERFORMING OPERATIONS; TRANSPORTING
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    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B23/00—Layered products comprising a layer of cellulosic plastic substances, i.e. substances obtained by chemical modification of cellulose, e.g. cellulose ethers, cellulose esters, viscose
    • B32B23/04—Layered products comprising a layer of cellulosic plastic substances, i.e. substances obtained by chemical modification of cellulose, e.g. cellulose ethers, cellulose esters, viscose comprising such cellulosic plastic substance as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B32B23/08—Layered products comprising a layer of cellulosic plastic substances, i.e. substances obtained by chemical modification of cellulose, e.g. cellulose ethers, cellulose esters, viscose comprising such cellulosic plastic substance as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin
    • B—PERFORMING OPERATIONS; TRANSPORTING
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    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/06—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/06—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B32B27/08—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin
    • B—PERFORMING OPERATIONS; TRANSPORTING
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    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/16—Layered products comprising a layer of synthetic resin specially treated, e.g. irradiated
    • B—PERFORMING OPERATIONS; TRANSPORTING
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    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/36—Layered products comprising a layer of synthetic resin comprising polyesters
    • B—PERFORMING OPERATIONS; TRANSPORTING
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    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
    • B32B37/14—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the properties of the layers
    • B32B37/24—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the properties of the layers with at least one layer not being coherent before laminating, e.g. made up from granular material sprinkled onto a substrate
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
    • B32B7/04—Interconnection of layers
    • B32B7/12—Interconnection of layers using interposed adhesives or interposed materials with bonding properties
    • B32B7/14—Interconnection of layers using interposed adhesives or interposed materials with bonding properties applied in spaced arrangements, e.g. in stripes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • 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
    • B65D65/00—Wrappers or flexible covers; Packaging materials of special type or form
    • B65D65/38—Packaging materials of special type or form
    • B65D65/40—Applications of laminates for particular packaging purposes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • 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
    • B65D81/00—Containers, packaging elements, or packages, for contents presenting particular transport or storage problems, or adapted to be used for non-packaging purposes after removal of contents
    • B65D81/34—Containers, packaging elements, or packages, for contents presenting particular transport or storage problems, or adapted to be used for non-packaging purposes after removal of contents for packaging foodstuffs or other articles intended to be cooked or heated within the package
    • B65D81/3415—Containers, packaging elements, or packages, for contents presenting particular transport or storage problems, or adapted to be used for non-packaging purposes after removal of contents for packaging foodstuffs or other articles intended to be cooked or heated within the package specially adapted to be heated in hot water, e.g. boil pouches
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
    • C08G18/00—Polymeric products of isocyanates or isothiocyanates
    • C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
    • C08G18/08—Processes
    • C08G18/10—Prepolymer processes involving reaction of isocyanates or isothiocyanates with compounds having active hydrogen in a first reaction step
    • C08G18/12—Prepolymer processes involving reaction of isocyanates or isothiocyanates with compounds having active hydrogen in a first reaction step using two or more compounds having active hydrogen in the first polymerisation step
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
    • C08G18/00—Polymeric products of isocyanates or isothiocyanates
    • C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
    • C08G18/28—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the compounds used containing active hydrogen
    • C08G18/30—Low-molecular-weight compounds
    • C08G18/32—Polyhydroxy compounds; Polyamines; Hydroxyamines
    • C08G18/3225—Polyamines
    • C08G18/3228—Polyamines acyclic
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    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
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    • C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
    • C08G18/28—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the compounds used containing active hydrogen
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    • C08G18/32—Polyhydroxy compounds; Polyamines; Hydroxyamines
    • C08G18/3271—Hydroxyamines
    • C08G18/3275—Hydroxyamines containing two hydroxy groups
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
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    • C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
    • C08G18/28—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the compounds used containing active hydrogen
    • C08G18/30—Low-molecular-weight compounds
    • C08G18/34—Carboxylic acids; Esters thereof with monohydroxyl compounds
    • C08G18/348—Hydroxycarboxylic acids
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    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
    • C08G18/00—Polymeric products of isocyanates or isothiocyanates
    • C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
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    • C08G18/4208—Polycondensates having carboxylic or carbonic ester groups in the main chain containing cyclic groups containing aromatic groups
    • C08G18/4211—Polycondensates having carboxylic or carbonic ester groups in the main chain containing cyclic groups containing aromatic groups derived from aromatic dicarboxylic acids and dialcohols
    • C08G18/4216—Polycondensates having carboxylic or carbonic ester groups in the main chain containing cyclic groups containing aromatic groups derived from aromatic dicarboxylic acids and dialcohols from mixtures or combinations of aromatic dicarboxylic acids and aliphatic dicarboxylic acids and dialcohols
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
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    • C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
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    • C08G18/721—Two or more polyisocyanates not provided for in one single group C08G18/73 - C08G18/80
    • C08G18/725—Combination of polyisocyanates of C08G18/78 with other polyisocyanates
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
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    • C08G18/70—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the isocyanates or isothiocyanates used
    • C08G18/72—Polyisocyanates or polyisothiocyanates
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    • C08G18/751—Polyisocyanates or polyisothiocyanates cyclic cycloaliphatic containing only one cycloaliphatic ring
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    • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
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    • C08G18/791—Nitrogen characterised by the polyisocyanates used, these having groups formed by oligomerisation of isocyanates or isothiocyanates containing isocyanurate groups
    • C08G18/792—Nitrogen characterised by the polyisocyanates used, these having groups formed by oligomerisation of isocyanates or isothiocyanates containing isocyanurate groups formed by oligomerisation of aliphatic and/or cycloaliphatic isocyanates or isothiocyanates
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    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
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    • B—PERFORMING OPERATIONS; TRANSPORTING
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    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
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    • B32B37/14—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the properties of the layers
    • B32B37/24—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the properties of the layers with at least one layer not being coherent before laminating, e.g. made up from granular material sprinkled onto a substrate
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    • B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
    • B32B37/12—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by using adhesives
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J2367/00—Characterised by the use of polyesters obtained by reactions forming a carboxylic ester link in the main chain; Derivatives of such polymers
    • C08J2367/02—Polyesters derived from dicarboxylic acids and dihydroxy compounds
    • C—CHEMISTRY; METALLURGY
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    • C08J2479/00—Characterised by the use of macromolecular compounds obtained by reactions forming in the main chain of the macromolecule a linkage containing nitrogen with or without oxygen, or carbon only, not provided for in groups C08J2461/00 - C08J2477/00
    • C08J2479/04—Polycondensates having nitrogen-containing heterocyclic rings in the main chain; Polyhydrazides; Polyamide acids or similar polyimide precursors
    • C08J2479/08—Polyimides; Polyester-imides; Polyamide-imides; Polyamide acids or similar polyimide precursors

Definitions

  • Multi-layer composites made from printed foils
  • the invention relates to a multilayer composite containing at least a first polymeric layer which is coated on at least one side with at least one printing ink containing at least one polyurethane as a binder, and a second layer which is at least partially bonded to the side of the first polymeric layer, which is coated with at least one printing ink containing at least one polyurethane as a binder, a method for producing the multilayer composite, at least comprising the steps of (A) providing at least one first polymeric layer, which is coated on at least one side with at least a printing ink containing at least one polyurethane as a binder, (B) applying a polyurethane dispersion as an adhesive to the first, polymeric layer, and (C) contacting the first, polymeric layer from step (B) with at least one second layer in order to the more To obtain htverbund, the use of the multi-layer composite for packaging food or animal feed, and packaging containing a corresponding multi-layer composite.
  • Multi-layer composites for packaging food are known per se, see, for example, "Polyurethanes: Coatings, Adhesives and Sealants", Meier-Westhues, ISBN 9783866307827, pages 325 to 331.
  • Packaging made of multi-layer composites have on their outside, i.e. on the one visible to the viewer visible side of the package, often a transparent lollipop printed on the inside. This is also referred to as counter pressure or inner layer pressure.
  • the ink is applied to the inner layer to protect the print from mechanical damage.
  • the print on the inside of a polyester film for example, appears more brilliant, which makes the packaging or the packaged food appear to be of higher quality.
  • inner layer printing is also necessary to make information about the packaged food, the ingredients, the nutritional data or the shelf life of the packaged food visible to retailers and consumers.
  • the loli can be printed using the lexoprinting or gravure printing process.
  • Typical loli are made of polyester, polypropylene or polyamide, for example.
  • Printing inks for multi-layer composites usually contain solvents. In addition to, for example, they contain about 70% by weight of solvent, for example about 10% by weight of at least one pigment and for example about 15% by weight of at least one film-forming binder. Other components are auxiliaries and additives, such as wetting agents, deaerators, etc., to adapt the printing ink to the printing process and the substrate to be printed.
  • Typical binders for solvent-based printing inks are, for example, nitrocellulose, polyvinyl chloride, polyvinyl butyral and polyurethane. Mixtures of binders are also possible. Printing inks based on polyurethane can optionally also be processed using crosslinking isocyanates.
  • a multi-layer composite is used for packaging foodstuffs that are exposed to high temperatures during or after packaging, the printing ink used must also be stable at these high process temperatures, i.e. the printing ink must not decompose or change color at high temperatures change.
  • treatments at high temperature are, for example, the heating or cooking of the food in the packaging, the so-called boil-in-bag, the hot filling of the food, the so-called hot-filling, or steam sterilization of the food or animal feed after Filling into the multi-layer composite, the so-called retort process.
  • polyurethane dispersions are used as adhesives in the production of multilayers, the so-called lamination. These polyurethane dispersions are known per se to those skilled in the art.
  • EP 2788447 B1 describes the use of aqueous polyurethane dispersions for composite film lamination, where at least 10% by weight of the polyurethane is made up of at least one amorphous polyester polyol, and the polyurethane dispersion contains at least one external crosslinker.
  • This external crosslinker is a polyisocyanate with at least two isocyanate groups.
  • the polyurethane in the aqueous dispersion is preferably neutralized with ammonia.
  • the foil material for producing the multilayer composite is selected from the group consisting of aluminum foil, printed polyester foil, unprinted polyester foil, printed polyamide foil, unprinted polyamide foil, polypropylene foil, polyethylene foil and combinations thereof.
  • the composite films disclosed are also suitable for highly resilient composite films which are used in particular for retort applications, in particular steam sterilization or pasteurization, and for hot-filling applications.
  • the document mentioned gives no information on the binders used in the printing ink.
  • a disadvantage of the adhesive used according to this document is the 2K (2-component) processing.
  • the polyisocyanate must be added immediately before processing the polyurethane dispersion. In this way, the work steps "adhesive production” and "processing” cannot be separated in time.
  • a laminate comprising two flexible foils which are connected with a curable adhesive.
  • the adhesive is created by mixing two components immediately before use, one component being at least one polyurethane with at least one carboxylic acid or sulfonic acid group.
  • the carboxylic acid or sulfonic acid groups are neutralized with ammonia.
  • the second component is a crosslinking agent for the polyurethane polymer. It contains a large number of carbodiimide, aziridine or epoxy groups.
  • the laminates mentioned can also be used in hot-fill or boil-in-bag processes.
  • the document mentioned makes no reference to printed foils. A disadvantage of this method is also the need for 2-component processing.
  • the object of the present invention is therefore to provide multi-layer composites, in particular special for the packaging of food, the multi-layer composites printed with polyurethane-based printing inks and in particular for the packaging of food or animal feed terffen, especially in boil-in-bag, hot filling and retort applications should be suitable. Furthermore, the adhesives used for the film lamination should be halogen-free and 1K (1-component) processable.
  • a multilayer composite containing at least a first polymeric layer which is coated on at least one side with at least one printing ink containing at least one polyurethane as a binder, and a second layer which is at least partially coated with a polyurethane dispersion as an adhesive connected to the side of the first polymeric layer coated with at least one printing ink containing at least one polyurethane as a binder.
  • the multilayer composite according to the invention comprises at least one first polymeric layer which is coated on at least one side with at least one printing ink containing at least one polyurethane as binder.
  • the multilayer composite in addition to this first, polymeric layer, can contain further layers which are connected at least partially, but preferably over the entire surface, to the first, polymeric layer or to further layers present.
  • the multilayer composite preferably has 1 to 6 further layers in addition to the first, polymeric layer.
  • the first, polymeric layer can contain, preferably consist of, any material that appears suitable to a person skilled in the art.
  • the material of the at least one first polymeric layer is preferably selected from polyethylene (PE), polypropylene (PP), polyamide (PA), polyesters, polyacetate, cellophane, polylactide (PLA) and mixtures thereof.
  • the first polymeric layer particularly preferably consists of polyethylene terephthalate, polypropylene or polyamide, and the first polymeric layer is more preferably a polyethylene terephthalate, polypropylene or polyamide film.
  • a polyethylene or polypropylene film is used as the first, polymeric layer, this generally contains a lubricant, for example oleic acid amide and/or erucic acid amide.
  • a lubricant for example oleic acid amide and/or erucic acid amide.
  • the first polymeric layer present according to the invention generally has a thickness of 5 to 200 ⁇ m, preferably 12 to 60 ⁇ m.
  • any further layers present can also contain or consist of polymeric materials.
  • Suitable polymeric materials for the additional layers that may be present are selected from polymeric materials, in particular films, selected from polyethylene (PE), in particular LDPE, LLDPE, HDPE, polypropylene (PP), in particular as an unstretched film (cPP), a film stretched on one side ( oPP) or film stretched on both sides (BOPP), made of polyamide (PA), polyesters, in particular polyethylene terephthalate (PET), polyacetate, cellophane, polylactide (PLA) and mixtures thereof.
  • PE polyethylene
  • LLDPE low density polyethylene
  • PP polypropylene
  • cPP unstretched film
  • oPP a film stretched on one side
  • BOPP film stretched on both sides
  • PA polyamide
  • PET polyethylene terephthalate
  • PLA polyacetate
  • PLA polylactide
  • the further layers that may be present particularly preferably consist of polyethylene terephthalate, polypropylene or polyamide; more preferably, the further layers that may be present are polyethylene terephthalate, polypropylene or polyamide films.
  • the further layers which may be present can optionally be provided with a lubricant, as explained above.
  • the possibly further present layers can also not consist of further ones be formed polymeric materials, such as metals, especially aluminum, or paper or combinations thereof.
  • the further layers which may be present according to the invention if they consist of or contain polymeric material, generally have a thickness of 5 to 200 ⁇ m, preferably 12 to 60 ⁇ m.
  • Any paper layer present generally has a thickness of 5 to 200 ⁇ m, preferably between 10 to 50 ⁇ m.
  • the dimensions of the first, polymeric layer and/or the further layers that may be present are not restricted according to the invention, but depend on the use of the multilayer composite according to the invention, for example as packaging for food or animal feed.
  • the present invention relates to the multi-layer composite according to the invention both as rolled goods, for example before food or animal feed are packaged with the multi-layer composite according to the invention, in particular as rolled goods with dimensions known to those skilled in the art, and as the actual packaging of foods or animal feed, also in dimensions known to those skilled in the art .
  • the additional layers that may be present can be transparent or opaque, i.e. colored with known dyes, for example. Furthermore, the further layers that may be present can be printed or unprinted.
  • the first, polymeric layer is coated on at least one side with at least one printing ink containing at least one polyurethane as binder.
  • the first, polymeric layer is preferably printed on at least one side, possibly also on both sides, with at least one printing ink containing at least one polyurethane as a binder. According to the invention, this print can cover the printed side of the first polymeric layer over the entire surface or partially, preferably partially.
  • Printing inks containing at least one polyurethane as a binder are known per se to those skilled in the art and are described, for example, in DE 60301623 T2, DE 60302141 T2 or DE 60100208 T2.
  • Polyurethanes suitable as binders are obtainable in particular by reacting an excess of one or more aliphatic diisocyanates with a group opposite to isocyanate reactive components consisting of one or more polyether polyols, each having an average molecular weight in the range of not more than 2000 g / mol, and at least one diamine to obtain a prepolymer, and a mixture of isophorone diamine and one second diamine selected from the group consisting of ethylenediamine, 1,2-diaminocyclohexane and 2,2,4- or 2,4,4-trimethyldiaminohexane (TMDA) in excess relative to the free NO groups of the prepolymer.
  • TMDA 2,2,4- or 2,4,4-trimethyldiaminohexane
  • aliphatic diisocyanate examples are straight-chain aliphatic, branched-chain aliphatic or cycloaliphatic diisocyanates.
  • the diisocyanate comprises 1 to 10 carbon atoms.
  • preferred diisocyanates are 1,4-diisocyanatobutane, 1,6-diisocyanatohexane, 1,5-diisocyanato-2,2-dimethylpentane, 4-trimethyl-1,6-diisocyanatohexane, 1,10-diisocyanatodecane, 1 ,3- and 1,4-diisocyanatocyclohexane, 1-isocyanato-5-isocyanatomethyl-3,3,5-trimethylcyclohexane (isophorone diisocyanate (IPDI)), 2,3-, 2,4- and 2,6- diisocyanato-1-methylcyclohexane, 4,4'- and 2,4'-di
  • Polyether polyol components of the polyurethane which can preferably be used correspond, for example, to the following formula
  • R is a straight or branched chain C2 to C10 hydrocarbyl group.
  • R is an alkylene group containing 2 to 4 carbon atoms.
  • polyether polyols examples include polyethylene ether glycols (PEG), polypropylene ether glycols (PPG), and polytetramethylene ether glycols (poly-THF), or a mixture thereof.
  • PEG polyethylene ether glycols
  • PPG polypropylene ether glycols
  • poly-THF polytetramethylene ether glycols
  • n is selected such that the average molecular weight of the polyether polyols is no more than 2000 g/mol, preferably less than 1500 g/mol and more preferably 1000 g/mol or less.
  • a particularly preferred polyether polyol of the present invention is Poly-THF 1000.
  • At least one diamine is added as a further isocyanate-reactive component.
  • the diamine can be any aliphatic, cycloaliphatic, aromatic or heterocyclic diamine having primary or secondary amino groups. Examples are ethylenediamine, 1,2-diaminopropane, 1,3-diaminopropane, diaminobutane, hexamethylenediamine, 1,4-diaminocyclohexane, 3- Aminomethyl-3,5,5-trimethylcyclohexylamine (isophoronediamine), m-xylenediamine or 1,3-bis(aminomethyl)cyclohexane. Isophorone diamine is particularly preferred.
  • one or more polyols which have an average molecular weight of less than or equal to 800 g/mol can be added, for example 1,4-butanediol, 1,6-hexanediol, neopentyldiol, dihydroxypolyetherpolyols, or polyesterpolyols the like.
  • the one or more diisocyanates and the isocyanate-reactive components are reacted together to form a first isocyanate-terminated prepolymer.
  • the ratio of the equivalent weights of diisocyanate components to isocyanate-reactive components is preferably from 3.6:1 to 1.1:1, preferably from 2:1 to 1.1:1.
  • the isocyanate-reactive components can be added to the isocyanate(s) in parallel or sequentially. In the case of sequential addition of the isocyanate-reactive ingredients, it is preferred to add the polyether polyol ingredients first, followed by addition of the diamine ingredient(s), and optionally by addition of the at least one polyol.
  • the reaction is carried out under conditions well known to those skilled in the art. The reaction can be carried out in the presence of a solvent using known catalysts.
  • Suitable solvents are alkyl acetates such as methyl acetate, ethyl acetate, propyl acetate, butyl acetate and pentyl acetate.
  • the total amount of the solvent is typically 0 to 90% by weight of the reaction mixture, preferably 25 to 60% by weight of the reaction mixture.
  • a catalyst can be used to accelerate the reaction of the diisocyanate with the diol.
  • Suitable catalysts are tin derivatives such as tin octylate, tin xalate, dibutyltin dilaurate, zinc derivatives such as zinc diacetate, zinc bisacetylacetonate or organotitan compounds such as tetrabutyl titanate or mixtures thereof.
  • antioxidants or additives can be present.
  • an antioxidant such as Irganox 1076 (octadecyl 3,5-di-t-butyl-4-hydroxyhydrocinnamate) may be added.
  • the formation of the isocyanate-terminated prepolymer is generally carried out at a temperature of 0 to 130°C, preferably 50 to 90°C.
  • the reaction time is, for example, 1 to 12 hours, preferably 1 to 4 hours.
  • the isocyanate-terminated prepolymer formed in this way is preferably treated with a mixture of isophoronediamine (IPDA) and a second diamine selected from the group consisting of ethylenediamine (EDA), 1,2-diaminocyclohexane and 2,2,4- or 2,4,4-trimethyldiaminohexane (TMDA), chain extended.
  • IPDA isophoronediamine
  • TMDA 2,2,4- or 2,4,4-trimethyldiaminohexane
  • the ratio of the second diamine to IPDA is preferably from 10:1 to 2:1, in particular from 5:1 to 3:1.
  • the polyurethane can be diluted in a solvent such as an alcohol, preferably ethanol, or an ester such as n-propyl acetate to achieve a clear solution.
  • a solvent such as an alcohol, preferably ethanol, or an ester such as n-propyl acetate to achieve a clear solution.
  • the polyurethane preferably has an average molecular weight of 20,000 to 80,000 g/mol, preferably 25,000 to 55,000 g/mol.
  • the polyurethane has a degree of urethanization of, for example, 20 to 30%.
  • the inks used are adaptable to the needs of different types of plastic substrates and/or application methods.
  • the printing ink used includes components that are typically used for certain printing processes, in particular gravure printing processes, the flexographic printing process or the gravure printing process.
  • the main components apart from the at least one polyurethane are at least one pigment and/or at least one colorant, at least one solvent and optionally additional additives.
  • a resin such as nitrocellulose can be used as a carrier for the dye or pigment.
  • solvents such as, for example, alcohols, in particular ethanol or isopropanol, can be used as solvents.
  • Additives are, for example, surface-active substances or surfactants, plasticizers, stabilizers or waxes.
  • one or more different printing ink(s) containing at least one polyurethane as a binder can be applied to the first, polymeric layer.
  • at least one printing ink containing at least one polyurethane as a binder at least one printing ink containing a binder other than polyurethane can also be present.
  • Processes for applying the at least one printing ink to the first, polymeric layer are known per se to a person skilled in the art, for example gravure print processes, the flexographic printing process or the gravure printing process.
  • the multilayer composite according to the invention comprises at least one second layer which is at least partially bonded with a polyurethane dispersion as an adhesive to the side of the first polymeric layer which is coated with at least one printing ink containing at least one polyurethane as a binder.
  • the second layers present according to the invention can likewise contain or consist of polymeric materials.
  • Suitable polymeric materials are selected for the second layer from polymeric materials, in particular films, selected from polyethylene (PE), in particular LDPE, LLDPE, HDPE, polypropylene (PP), in particular as an unstretched film (cPP), one-sided film (oPP) or film stretched on both sides (BOPP), made of polyamide (PA), polyesters, in particular polyethylene terephthalate (PET), polyacetate, cellophane, polylactide (PFA) and mixtures thereof.
  • PE polyethylene
  • LLDPE low density polyethylene
  • HDPE high-ethylene
  • PP polypropylene
  • cPP unstretched film
  • oPP one-sided film
  • BOPP film stretched on both sides
  • PA polyamide
  • PET polyethylene terephthalate
  • PFA polyacetate
  • cellophane cellophane
  • PFA polylactide
  • the second layer particularly preferably consists of polyethylene terephthalate, polypropylene or polyamide, and the second layer is more preferably a polyethylene terephthalate, polypropylene or polyamide film. If necessary, the second layer can be equipped with a lubricant, as explained above.
  • the second layer can preferably be formed from non-polymeric materials, for example from metals, in particular aluminum, or paper or combinations thereof.
  • the present invention preferably relates to the multilayer composite according to the invention, the at least one further layer being a polymeric layer or a layer made of at least one metal, preferably aluminum.
  • the second layer of the multi-layer composite particularly preferably consists of a metal, in particular aluminum.
  • the second layer consists of or contains a polymeric material, it generally has a thickness of 5 to 200 ⁇ m, preferably 12 to 60 ⁇ m.
  • a second layer of paper generally has a thickness of 5 to 200 ⁇ m, preferably between 10 to 50 ⁇ m.
  • the second layer according to the invention consists of or contains a metal, in particular aluminum, it generally has a thickness of 5 to 100 ⁇ m, preferably 9 to 15 ⁇ m.
  • the dimensions in terms of width and length of the second layer are not restricted according to the invention, but are preferably based on the dimensions of the first, polymeric layer and any further layers present.
  • the second layer therefore preferably has the same dimensions as the first, polymeric layer and the entire multilayer composite according to the invention.
  • the second layer may be transparent or opaque, i.e. colored with known dyes, for example. Furthermore, the second layer can be printed or unprinted. Since the second layer preferably consists of a metal, more preferably aluminum, it is preferably opaque.
  • the present invention preferably relates to the multilayer composite according to the invention, the first, polymeric layer consisting of a polyester and the second layer consisting of aluminum.
  • the layers present in the multilayer composite according to the invention in particular the first polymeric layer, any other layers present and the second layer, optionally printed with printing ink containing at least one polyurethane or vapor-coated with aluminum or silicon dioxide, can be coated according to the invention in any conceivable way , in particular sequence, can be combined with one another.
  • the structure of the multi-layer composite depends, for example, on the requirements in terms of barrier effect and costs.
  • the multilayer composite according to the invention preferably comprises a first polymeric layer which is coated on at least one side with at least one printing ink containing at least one polyurethane as a binder, and a second layer which is at least partially bonded to the side of the first polymers with a polyurethane dispersion as an adhesive Layer which is coated with at least one printing ink containing at least one polyurethane as a binder is connected.
  • the multilayer composite according to the invention preferably comprises a first polymeric layer which is coated on at least one side with at least one printing ink containing at least one polyurethane as a binder, and a second layer, in particular made of a metal, preferably aluminum, which is coated with a polyurethane dispersion as adhesive is at least partially bonded to the side of the first polymeric layer coated with at least one ink containing at least one polyurethane as a binder, and a third, polymeric layer bonded to the side of the second layer not bonded to the first, polymeric layer is connect, preferably with an adhesive, in particular a polyurethane dispersion, is at least partially connected.
  • layers with low-energy surfaces i.e. surfaces with a surface energy ⁇ 38 mN/m
  • these are subjected to a pretreatment with atmospheric pressure plasma (corona).
  • corona atmospheric pressure plasma
  • such a pretreatment can be carried out immediately before the polyurethane dispersion is applied as an adhesive or, in the case of the second layer, before it enters the laminating plant.
  • the at least two layers of the multilayer composite according to the invention are connected with a polyurethane dispersion as an adhesive.
  • a polyurethane dispersion is preferably used as the adhesive.
  • At least one polyurethane dispersion as the adhesive, which is a mixture of at least one aqueous polyurethane dispersion (I) and at least one aqueous dispersion of at least one hydrophilicized polycarbodiimide (II).
  • Aqueous polyurethane dispersions (I) for the purposes of the present invention are dispersions of polyurethane-polyurea polymers in water.
  • polyurethane relates to polymeric compounds which have polyurethane and/or polyurea groups.
  • Polyurethanes preferably used according to the invention contain as structural components:
  • amorphous in the context of the present invention are solids whose building blocks are not arranged in crystal lattices, ie are not crystalline.
  • amorphous polyesters are in particular those polyesters which have no melting peak in a DSC measurement according to DIN 65467-1999-03 at a heating rate of 20 K/min in the temperature range from -30.degree. C. to +100.degree.
  • the polyurethane polymer preferably contains at least one amorphous polyester polyol, preferably polyester diol, in an amount of at least 20% by weight, preferably at least 40% by weight, particularly preferably at least 60% by weight, based in each case on the polyurethane polymer.
  • An upper limit for the amount of at least one amorphous polyester polyol in the polyurethane polymer is preferably at most 90% by weight, for example at most 88% by weight, but it can also be more than 90% by weight.
  • the at least one amorphous polyester polyol preferably polyester diol, preferably has an average molecular weight of at least 500 g/mol.
  • the average molecular weight is particularly preferably 1000 to 4000 g/mol, particularly preferably 1700 to 2500 g/mol, determined in each case by gel permeation chromatography (GPC) according to DIN 55672-1:2016-03 in tetrahydrofuran at 23° C. against a polystyrene standard
  • the at least one amorphous polyester polyol used according to the invention is preferably at least one amorphous polyester diol.
  • At least one aromatic dicarboxylic acid is preferably used to prepare the at least one amorphous polyester diol (A).
  • Isophthalic acid and terephthalic acid are preferred. Isophthalic acid is particularly preferred.
  • a mixture of carboxylic acids consisting of at least one aliphatic dicarboxylic acid having 3 to 10, preferably 4 to 8 carbon atoms and at least one aromatic dicarboxylic acid is used to prepare the at least one amorphous polyester diol (A).
  • the mixing ratio is preferably 0.5:1 to 2:1.
  • a preferred dicarboxylic acid mixture is adipic acid/isophthalic acid, especially in a ratio of 0.5:1 to 2:1.
  • the polyhydric alcohols that can be used are, for example, ethylene glycol, propane-1,2-diol, propane-1,3-diol, butane-1,3-diol, butene-1,4-diol, Butyne-1,4-diol, pentane-1,5-diol, neopentyl glycol, bis(hydroxymethyl)cyclohexanes such as 1,4-bis(hydroxymethyl)cyclohexane, 2-methylpropane-1,3-diol, methylpentanediols , Furthermore, diethylene glycol, triethylene glycol, tetraethylene glycol, polyethylene glycol, dipropylene glycol, polypropylene glycol, dibutylene glycol and polybutylene glycols are used.
  • Alcohols are preferred general formula HO-(CH2) x -OH, where x is an integer from 1 to 20, preferably an even number from 2 to 20.
  • Preferred examples thereof are ethylene glycol, butane-1,4-diol, hexane-1,6-diol, octane-1,8-diol and dodecane-1,12-diol.
  • Neopentyl glycol is also preferred.
  • Butane-1,4-diol, hexane-1,6-diol and neopentyl glycol are particularly preferred.
  • diisocyanates (B) in particular diisocyanates of the general formula X (NCO) 2, where X is an aliphatic hydrocarbon radical having 4 to 15 carbon atoms, a cycloaliphatic or aromatic hydrocarbon radical having 6 to 15 carbon atoms or an aliphatic hydrocarbon radical having 7 to 15 carbon atoms.
  • diisocyanates examples include tetramethylene diisocyanate, hexamethylene diisocyanate, dodecamethylene diisocyanate, 1,4-diisocyanatocyclohexane, 1-isocyanato-3,5,5-trimethyl-5-isocyanatomethylcyclohexane (IPDI), 2,2-bis(4-isocyanatocyclohexyl)propane , trimethylhexane diisocyanate, 1,4-diisocyanatobenzene, 2,4-diisocyanatotoluene, 2,6-diisocyanatotoluene, 4,4'-diisocyanatodiphenylmethane, 2,4'-diisocyanato-diphenylmethane, p-xylylene diisocyanate, tetramethylxylylene diisocyanate (TMXDI), the isomers of bis(4-iso
  • hexamethylene diisocyanate tetramethylxylylene diisocyanate (TMXDI) and l-isocyanato-3,5,5-trimethyl-5-isocyanatomethylcyclohexane (IPDI), particular preference being given to l-isocyanato-3,5,5-trimethyl-5-isocyanatomethylcyclohexane (IPDI ).
  • TXDI tetramethylxylylene diisocyanate
  • IPDI l-isocyanato-3,5,5-trimethyl-5-isocyanatomethylcyclohexane
  • polyisocyanates containing isocyanurate and/or biuret groups which are also used to a small extent.
  • Commercially available compounds are, for example, the isocyanurate or the biuret of hexamethylene diisocyanate.
  • Suitable components (C) which additionally contain at least one ionic group or at least one group that can be converted into an ionic group are, for example, monohydric to trihydric alcohols, monoamino and/or diamino carboxylic acids.
  • the mono- to trihydric alcohols (C) contain, in particular, anionic groups such as the sulfonate, carboxylate and phosphate groups.
  • anionic groups such as the sulfonate, carboxylate and phosphate groups.
  • ionic group is also intended to include groups that can be converted into ionic groups.
  • carboxylic acid, sulfonic acid or phosphoric acid groups which can be converted into ionic groups by neutralization are also regarded as ionic groups.
  • Dihydroxycarboxylic acids and diaminocarboxylic acids are preferred as compound (C). Very particular preference is given to dihydroxycarboxylic acids, in particular dimethylolpropionic acid (DMPA) and dimethylolbutyric acid (DMBS).
  • Ammonia and tertiary amines are suitable as component (D).
  • Particularly suitable and preferred tertiary amines are triethylamine, dimethylcyclohexylamine and ethyldiisopropylamine.
  • amines can also be used for salt formation, for example diethanolamine, triethanolamine, dimethylethanolamine, methyldiethanolamine, aminomethylpropanol and also mixtures of these and other amines.
  • Ammonia and triethylamine are particularly preferred as (D). Ammonia is very particularly preferred. Part of the ammonia first reacts with the NCO groups present in the prepolymer consisting of components (A), (B) and (C) with addition and chain termination, the remainder as neutralizing amine. By prior reaction of the prepolymer with a diamine as chain extender (E), the number of remaining NCO groups and thus the ratio between chain extension and chain termination can be varied when using ammonia. This allows the molecular weight of the polymer to be adjusted. If ammonia is used, it makes sense to first react the prepolymer with component (E) and only then add ammonia as component (D).
  • diamines (E) are 1,2-ethanediamine (ethylenediamine), 1,6-hexamethylenediamine, 1-amino-3,3,5-trimethyl-5-aminomethylcyclohexane (isophoronediamine), piperazine, 1,4-diaminocyclohexane and bis(4-aminocyclohexyl)methane.
  • Adipic acid dihydrazide, hydrazine or hydrazine hydrate are also possible. It is of course also possible to use mixtures of a plurality of the compounds D), optionally also together with compounds D) which are not mentioned.
  • Preferred components (E) are ethylenediamine and isophoronediamine. Ethylenediamine is very particularly preferred.
  • ammonia is used as component (D) and ethylenediamine as component (E).
  • Other isocyanate-reactive compounds (F) are in principle all of the various compounds (A) to (E) that are reactive toward isocyanate, for example diols with a molecular weight of 62 to 499 g/mol, crystalline polyester diols, further polymer diols such as polyethers, Lactones or polycarbonates, monools, monoamines and polyamines.
  • the polyurethane dispersion used according to the invention has, for example, a solids content of 35 to 48% by weight, preferably 38 to 45% by weight.
  • aqueous dispersion of a hydrophilized polycarbodiimide (II) in the context of the present invention is a crosslinking agent which has carbodiimide groups and is dispersed, emulsified, dissolved or dispersible, emulsifiable and/or soluble in water.
  • crosslinkers containing carbodiimide structures which contain on average 3 to 20, particularly preferably 4 to 8, carbodiimide structural units per molecule.
  • Such carbodiimide crosslinking agents can be produced, for example, by carbodiimidization of diisocyanates such as tetramethylene diisocyanate, methylpentamethylene diisocyanate, hexamethylene diisocyanate, dodecamethylene diisocyanate, 1,4-diisocyanatocyclohexane, 1-isocyanato-3,3,5-trimethyl-5-isocyanatomethylcyclohexane, 4,4'-diisocyanatodicyclohexylmethane, 4,4'-diisocyanatodicyclohexylpropane-(2,2), 1,4-diisocyanatobenzene, 2,4-diisocyanatotoluene, 2,6-diisocyanatoto- luol, 4,4'-diisocyanatodiphenylmethane, 2,2'- and 2,4'-diisocyanatodip
  • Preferred carbodiimides are obtained by carbodiimidization of 1-isocyanato-3,3,5-trimethyl-5-isocyanatomethylcyclohexane and/or 4,4'-diisocyanatodicyclohexylmethane.
  • mixed carbodiimides which contain, for example, carbodiimides based on different isocyanates, is also possible.
  • carbodiimides examples include Carbodilite® SV-02, Carbodilite® V-02-L2, Carbodilite® E-02, all from Nisshinbo Industries, Tokyo, Japan, and Desmodur® XP 2802 from Covestro GmbH AG.
  • Preferred carbodiimides are Carbodilite® V-02-L2 and Desmodur XP® 2802, with Desmodur XP® being particularly preferred.
  • Suitable carbodiimides are also aqueous carbodiimide dispersions or carbodiimide emulsions or carbodiimide solutions and/or water-dispersible carbodiimides containing reaction products of a) at least one carbodiimide which has an average of 3 to 20, preferably 4 to 8 carbodiimide structural units based on difunctional isocyanates, in particular Desmodur® W, Desmodur® I, Desmodur® H and/or Desmodur® T (all Bayer MaterialScience, Germany) and b) hydrophilic components such as at least one hydroxy-functional polyether based on ethylene oxide or based on ethylene and propylene oxide As, for example, methoxypolyethylene glycols, ethoxypolyethylene glycols, butoxypolyethylene glycols, each with molecular weights of 350 to 3000 g/mol, such as Carbowax® MPEG 750, MPEG 550, MPEG 350, each from DOW Chemical Company, USA, Polyether
  • Components a), b) and c) can be reacted in any order, if appropriate also in the presence of solvents.
  • Carbodiimides ii) are preferably reaction products of 50 to 97% by weight of component a), 3 to 40% by weight of component b) and 0 to 25% by weight of component c), the sum of components a), b ) and c) are each 100% by weight.
  • the carbodiimides are particularly preferred reaction products of 60 to 90% by weight of component a), 5 to 27% by weight of component b) and 0.5 to 15% by weight of component c), the sum of components a) , b) and c) are each 100% by weight.
  • the carbodiimides can be prepared by known methods.
  • suitable catalysts are heterocyclic, phosphorus-containing compounds, metal carbonyls, phospholines, phospholenes and phospholidines and their oxides and sulfides.
  • a carbodiimide is preferably first reacted by heating at least one at least difunctional isocyanate in the presence of a suitable catalyst, such as phospholine oxide, at 100 to 250° C. with elimination of carbon dioxide until the desired degree of conversion is achieved, and then this carbodiimide in one further reaction step with component b) and optionally simultaneously or subsequently with component c) and optionally subsequently dispersed, emulsified or dissolved.
  • a suitable catalyst such as phospholine oxide
  • the aqueous dispersion of the hydrophilized polycarbodiimide used according to the invention has, for example, a solids content of 37 to 42% by weight.
  • the aqueous polyurethane dispersion used according to the invention as an adhesive preferably contains 70 to 99% by weight of the polyurethane dispersion (I) according to the invention and 1 to 30% by weight of the aqueous dispersion of the hydrophilized polycarbodiimide (II).
  • a polyurethane dispersion used with particular preference as an adhesive contains from 80 to 97% by weight of the polyurethane dispersion (I) according to the invention and from 3 to 20% by weight of the aqueous dispersion of the hydrophilicized polycarbodiimide (II).
  • a polyurethane dispersion used very particularly preferably as an adhesive contains 85 to 92% by weight of the polyurethane dispersion (I) according to the invention and 8 to 15% by weight of the aqueous dispersion of the hydrophilicized polycarbodiimide (II).
  • the aqueous polyurethane dispersion used as an adhesive can be prepared by simply mixing components (I) and (II).
  • the aqueous polyurethane dispersion (I) is preferably initially taken and the aqueous dispersion of the hydrophilicized polycarbodiimide (II) is added with stirring.
  • the adhesive dispersions can be stored for at least several hours and can therefore be processed with 1-component.
  • aqueous polyurea dispersion used according to the invention as an adhesive can be used alone or with binders, auxiliaries and traction materials known in coating and adhesive technology, in particular emulsifiers and light stabilizers such as UV absorbers and sterically hindered amines (HALS), furthermore antioxidants, fillers and auxiliaries, for example, anti-settling agents, defoamers and/or wetting agents, leveling agents, reactive diluents, plasticizers, catalysts, auxiliary solvents and/or thickeners and additives, such as pigments, dyes or matting agents, for example, can be used.
  • emulsifiers and light stabilizers such as UV absorbers and sterically hindered amines (HALS), furthermore antioxidants, fillers and auxiliaries, for example, anti-settling agents, defoamers and/or wetting agents, leveling agents, reactive diluents, plasticizers, catalysts, auxiliary solvents and/or thickeners and additives
  • the additives can be added to the adhesive used according to the invention immediately before processing. However, it is also possible to add at least some of the additives before or during the dispersion of the polyurethane.
  • the present invention also relates to a method for producing the multilayer composite according to the invention, at least comprising the steps:
  • step (C) Bringing the first, polymeric layer from step (B) into contact with at least one second layer in order to obtain the multilayer composite according to the invention.
  • the individual steps of the method according to the invention are described in detail below.
  • the multilayer composite according to the invention is produced in a semi-continuous dry lamination process.
  • Step (A) comprises providing the at least one first polymeric layer which is coated on at least one side, at least partially or completely, with at least one printing ink containing at least one polyurethane as a binder.
  • step (A) only a first, polymeric layer can be provided in step (A).
  • a combination of the first, polymeric layer and further layers can also be provided in step (A).
  • the first, polymeric layer is coated on at least one side, at least partially or completely, with at least one printing ink containing at least one polyurethane as a binder.
  • the coating of the first, polymeric layer can be monochromatic, multicolored, covering the layer only partially or completely.
  • step (A) of the method according to the invention takes place, for example, in that the first polymeric layer is guided from an unwinding station through an application unit.
  • Step (B) of the method according to the invention comprises the application of a polyurethane dispersion as an adhesive to the first, polymeric layer.
  • step (B) can be carried out in all ways known to those skilled in the art, for example the adhesive in step (B) is applied to the first, polymeric layer by means of a gravure or smooth roller.
  • the rollers can be rotated in the direction of travel of the first, polymeric layer or in the opposite direction (reverse).
  • the adhesive layer can be treated, for example, with a rotary finishing rod, which usually results in a smoother adhesive layer.
  • a rotary finishing rod which usually results in a smoother adhesive layer.
  • the appearance of the adhesive layer can be improved in this way.
  • Other suitable techniques for applying the polyurethane dispersion in step (B) are spray application, air knife application or curtain coating.
  • step (B) the application amount of the polyurethane dispersion is adjusted so that after drying, ie the evaporation of the water, 0.1 to 20 g / m 2 , preferably 0.5 to 7g / m 2 polyurethane polymer on the first, polymeric film are present.
  • the coated first, polymeric layer is preferably dried, in particular guided through a drying tunnel.
  • the polyurethane dispersion layer is dried in the drying tunnel and all components that are volatile under the drying conditions are evaporated.
  • the temperature in the drying tunnel is, for example, 50 to 200.degree. C., preferably 70 to 90.degree.
  • the web speed in the drying step depends, for example, on the application weight of the dispersion, the polymer content in the dispersion, the length of the drying tunnel, the temperature in the drying tunnel, the air flow in the drying tunnel, the amount of air entering the drying tunnel and the humidity of the incoming air.
  • the web speed is decisive for the economy of the process and is preferably 100 to 1000 m/min., preferably 150 to 300 m/min.
  • Step (C) of the method according to the invention comprises bringing the first, polymeric layer from step (B) into contact with at least one second layer in order to obtain the multi-layer composite according to the invention.
  • Step (C) of the method according to the invention is preferably carried out in that the first, polymeric layer with the dried polyurethane polymer from step (B) after exiting the drying tunnel in a heatable laminating unit, preferably the pair of rollers consists of a steel roller and a rubber roller, is laminated against the second layer.
  • the second layer is too running here.
  • the pressure in step (C), in particular between the rollers in the laminating unit, is preferably 100 to 3000 kN/m 2 , preferably 500 to 2000 kN/m 2 .
  • the temperature in step (C), in particular of the steel roller in the laminating plant, is from 20 to 200.degree. C., preferably from 40 to 90.degree.
  • the resulting multilayer composite according to the invention is wound up and stored until further processing, ie until packaging of foodstuffs or animal feed.
  • the present invention also relates to the use of the multi-layer composite according to the invention for packaging animal feed or animal feed, in particular for treatments at high temperatures, for example 90 to 140° C., for example for up to 60 minutes. Examples of this are heating or cooking the animal feed in the packaging, the so-called boil-in-bag, the hot filling of the feed, the so-called hot-filling, or steam sterilization of the feed or animal feed after it has been filled into the multi-layer composite, the so-called retort process.
  • the present invention therefore preferably relates to the use according to the invention, these being suitable for treatments at high temperature, in particular heating or cooking the Febenstoff or animal feed in the packaging, the so-called boil-in-bag, the hot filling of Febenstoff or Animal feed, the so-called hot-filling, or steam sterilization of the February agent or animal feed after filling into the multi-layer composite, the so-called retort process.
  • the present invention further relates to packaging containing a multi-layer composite according to the invention.
  • Polyester film Hostaphan ® RNK 23 pm untreated, Mitsubishi Polyester Film, D-
  • Aluminum foil pure aluminum foil Feg. 8011 12 pm, Korff AG, CH-4538 Oberbipp,
  • PVC ink binder polyvinyl chloride, color white; solvent ethyl acetate
  • PU ink polyurethane binder; Color white; solvent ethyl acetate
  • the prepolymer formed 1540 g of acetone were added and the Mixture stirred at 48°C for 20 minutes. The mixture was neutralized at 48° C. with 15.13 g of triethylamine dissolved in 50 g of acetone while stirring. After 15 minutes, a mixture of 10.35 g of ethylenediamine, 2.40 g of diethanolamine and 115 g of water was added at 48° C. and the mixture was stirred for a further 30 minutes. 1460 g of water were then added to the acetonic prepolymer mixture with vigorous stirring and dispersed at 48° C. for 20 minutes. After the acetone had been removed by distillation, an aqueous dispersion having a solids content of 40.0% by weight was obtained.
  • a constant isocyanate content of 2.35% by weight was reached after 1 hour.
  • 1540 g of acetone were added and the mixture was stirred at 48° C. for 20 minutes.
  • a solution of 13.76 g of ethylenediamine in 124 g of water was then added at 48° C. with stirring, and the mixture was stirred for 30 minutes.
  • 18.45 g of a 25% strength by weight aqueous ammonia solution were then added dropwise within 5 minutes at 48° C. with stirring, and the mixture was stirred for a further 15 minutes.
  • 1450 g of water were then added to the acetonic prepolymer mixture, with vigorous stirring, and the mixture was dispersed at 48° C. for 20 minutes. After the acetone had been removed by distillation, an aqueous dispersion having a solids content of 40.1% by weight was obtained.
  • Desmodur XP 2802 approx. 40% by weight aqueous dispersion of polycarbodiimide with a carbodiimide content of approx. 1 DCC eq. (mmol/g), Covestro GmbH AG
  • Example 1 100 parts by weight PUD 1 + 13.5 parts by weight Desmodur XP 2802
  • Example 2 100 parts by weight PUD 2 + 13.5 parts by weight Desmodur XP 2802
  • Example 3 100 parts by weight PUD 3 + 13.5 parts by weight Desmodur XP 2802
  • Example 4 100 parts by weight PUD 4 + 13.5 parts by weight Desmodur XP 2802
  • Labo Combi 400 duplex laminating machine for laboratories from Nordmeccanica, Italy.
  • the laminating machine has an inline corona station for the pre-treatment of low-energy film surfaces and a drying channel for evaporating the solvents and water.
  • the printing inks were applied to the polyester film using the Labo Combi 400.
  • the polyester film was pretreated inline with corona before printing.
  • the surface energy of the polyester film was >40m N/m in all cases.
  • the ink was adjusted to processing viscosity with ethyl acetate.
  • the printing ink was applied in gravure printing using a gravure roller.
  • the web speed was 30 m/min in each case.
  • the film web coated with printing ink was then fed through the drying tunnel.
  • the temperature in the drying tunnel was 70 °C.
  • the application weight of the full-area printed layer after the solvent had flashed off was set to 2 g/m 2 in all cases.
  • the multilayer composites were produced with the Labo Combi 400.
  • the aqueous adhesive dispersions according to Examples 1 to 4 each with a polymer content of about 40% by weight, were applied to the printed side of the polyester film using a gravure roller.
  • the adhesive layer obtained in this way was dried at 70° C. in a drying tunnel.
  • the aluminum foil was then laminated under pressure against the adhesive-coated, printed polyester film in the laminating unit heated to 40.degree.
  • V2 comparative PET / printed over the entire surface with PVC printing ink (application weight 2.0 g/m 2 ).
  • Tensile shear test on stored samples were tested at 23 °C/50% r.h. stored. The bond strength was determined after 1 week. In addition, the stored composites were stored for a further 24 h after 1 week, after sterilization under the conditions 60 min @ 120 °C and 60 min @ 134 °C, and then the tensile shear strength was tested.
  • the multi-layer composite V2 delaminates under conditions that correspond to treatment in a steam sterilizer, i.e. 60 minutes at 121 °C or 60 minutes at 134 °C
  • the multi-layer composites 3 (with PU printing ink) consistently achieve high values even under conditions that correspond to treatment in a steam sterilizer, i.e. 60 minutes at 121 °C or 60 minutes at 134 °C.

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  • Organic Chemistry (AREA)
  • Health & Medical Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Medicinal Chemistry (AREA)
  • Polymers & Plastics (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
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  • Life Sciences & Earth Sciences (AREA)
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  • Wood Science & Technology (AREA)
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Abstract

L'invention concerne un composite multicouche, contenant au moins une première couche polymère qui, sur au moins un côté, est revêtue d'au moins une encre d'impression contenant au moins un polyuréthane en tant que liant, et une seconde couche qui, avec une dispersion de polyuréthane en tant qu'adhésif, est jointe au moins partiellement au côté de la première couche polymère qui est revêtue d'au moins une encre d'impression contenant au moins un polyuréthane en tant que liant ; un procédé de production du composite multicouche, comprenant au moins les étapes (A) de fourniture d'au moins une première couche polymère qui, sur au moins un côté, est revêtue d'au moins une encre d'impression contenant au moins un polyuréthane en tant que liant, (B) d'application d'une dispersion de polyuréthane en tant qu'adhésif à la première couche polymère, et (C) de mise en contact de la première couche polymère de l'étape (B) avec au moins une seconde couche pour obtenir le composite multicouche ; l'utilisation du composite multicouche pour l'emballage de produits alimentaires ou d'aliments pour animaux ; et un emballage contenant un composite multicouche correspondant.
EP22706808.7A 2021-02-22 2022-02-18 Composites multicouches de films imprimés Pending EP4294635A1 (fr)

Applications Claiming Priority (2)

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EP21158330.7A EP4046794A1 (fr) 2021-02-22 2021-02-22 Composés multicouche constitués de feuilles imprimées
PCT/EP2022/054030 WO2022175424A1 (fr) 2021-02-22 2022-02-18 Composites multicouches de films imprimés

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US20240124663A1 (en) 2024-04-18
CN117042957A (zh) 2023-11-10
EP4046794A1 (fr) 2022-08-24

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