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EP4638570A1 - Film plastique recyclable revêtu en surface - Google Patents

Film plastique recyclable revêtu en surface

Info

Publication number
EP4638570A1
EP4638570A1 EP23834136.6A EP23834136A EP4638570A1 EP 4638570 A1 EP4638570 A1 EP 4638570A1 EP 23834136 A EP23834136 A EP 23834136A EP 4638570 A1 EP4638570 A1 EP 4638570A1
Authority
EP
European Patent Office
Prior art keywords
layer
plastic film
dehesive
film according
water
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
EP23834136.6A
Other languages
German (de)
English (en)
Inventor
Patrick ALTMANN
Christian Hermann
Kilian STENGL
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.)
Loparex Germany GmbH and Co KG
Original Assignee
Loparex Germany GmbH and Co KG
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 Loparex Germany GmbH and Co KG filed Critical Loparex Germany GmbH and Co KG
Publication of EP4638570A1 publication Critical patent/EP4638570A1/fr
Pending legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D129/00—Coating compositions based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by an alcohol, ether, aldehydo, ketonic, acetal, or ketal radical; Coating compositions based on hydrolysed polymers of esters of unsaturated alcohols with saturated carboxylic acids; Coating compositions based on derivatives of such polymers
    • C09D129/02—Homopolymers or copolymers of unsaturated alcohols
    • C09D129/04—Polyvinyl alcohol; Partially hydrolysed homopolymers or copolymers of esters of unsaturated alcohols with saturated carboxylic acids
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
    • C08F216/00—Copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by an alcohol, ether, aldehydo, ketonic, acetal or ketal radical
    • C08F216/02—Copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by an alcohol, ether, aldehydo, ketonic, acetal or ketal radical by an alcohol radical
    • C08F216/04—Acyclic compounds
    • C08F216/06—Polyvinyl alcohol ; Vinyl alcohol
    • 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
    • C08J7/00—Chemical treatment or coating of shaped articles made of macromolecular substances
    • C08J7/04—Coating
    • C08J7/0427—Coating with only one layer of a composition containing a polymer binder
    • 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
    • C08J7/00—Chemical treatment or coating of shaped articles made of macromolecular substances
    • C08J7/04—Coating
    • C08J7/043—Improving the adhesiveness of the coatings per se, e.g. forming primers
    • 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
    • C08J7/00—Chemical treatment or coating of shaped articles made of macromolecular substances
    • C08J7/04—Coating
    • C08J7/056—Forming hydrophilic coatings
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
    • C09D5/008—Temporary coatings
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
    • C09D5/16—Antifouling paints; Underwater paints
    • C09D5/1606—Antifouling paints; Underwater paints characterised by the anti-fouling agent
    • C09D5/1637—Macromolecular compounds
    • 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
    • B32B2255/00—Coating on the layer surface
    • B32B2255/10—Coating on the layer surface on synthetic resin layer or on natural or synthetic rubber layer
    • 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
    • B32B2255/00—Coating on the layer surface
    • B32B2255/26—Polymeric coating
    • 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
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/70—Other properties
    • B32B2307/716—Degradable
    • B32B2307/7166—Water-soluble, water-dispersible
    • 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
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/70—Other properties
    • B32B2307/732—Dimensional properties
    • B32B2307/737—Dimensions, e.g. volume or area
    • B32B2307/7375—Linear, e.g. length, distance or width
    • B32B2307/7376—Thickness
    • 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
    • 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
    • B32B27/30—Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers
    • B32B27/306—Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers comprising vinyl acetate or vinyl alcohol (co)polymers
    • 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
    • B32B27/32—Layered products comprising a layer of synthetic resin comprising polyolefins
    • 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
    • B32B27/34—Layered products comprising a layer of synthetic resin comprising polyamides
    • 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
    • B32B27/36—Layered products comprising a layer 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
    • 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
    • B32B7/02—Physical, chemical or physicochemical properties
    • 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
    • B32B7/06—Interconnection of layers permitting easy separation
    • 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
    • C08J2323/00—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers
    • C08J2323/02—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers not modified by chemical after treatment
    • C08J2323/04—Homopolymers or copolymers of ethene
    • C08J2323/06—Polyethene
    • 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
    • C08J2323/00—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers
    • C08J2323/02—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers not modified by chemical after treatment
    • C08J2323/10—Homopolymers or copolymers of propene
    • C08J2323/14—Copolymers of propene
    • 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
    • C08J2383/00—Characterised by the use of macromolecular compounds obtained by reactions forming in the main chain of the macromolecule a linkage containing silicon with or without sulfur, nitrogen, oxygen, or carbon only; Derivatives of such polymers
    • C08J2383/04—Polysiloxanes
    • 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
    • C08J2429/00—Characterised by the use of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by an alcohol, ether, aldehydo, ketonic, acetal, or ketal radical; Hydrolysed polymers of esters of unsaturated alcohols with saturated carboxylic acids; Derivatives of such polymer
    • C08J2429/02—Homopolymers or copolymers of unsaturated alcohols
    • C08J2429/04—Polyvinyl alcohol; Partially hydrolysed homopolymers or copolymers of esters of unsaturated alcohols with saturated carboxylic acids

Definitions

  • the invention relates to a plastic film surface-coated on at least one side, comprising a carrier film with a first outer layer and a second outer layer; and a first surface coating which covers at least part of the first outer layer of the carrier film; wherein the carrier film comprises at least one layer which contains or is based on non-water-soluble polymer; and the plastic film contains water-soluble polymer, wherein (i) the carrier film comprises at least one layer which contains or is based on water-soluble polymer, and/or (ii) the first surface coating contains or is based on water-soluble polymer.
  • the coatings used include, for example, dehesive silicone coatings, adhesive pressure-sensitive adhesive coatings, printing inks and varnishes.
  • Such surface-coated films cannot be recycled economically and ecologically in the sense of a circular economy.
  • the reason for this is that the surface coatings, e.g. silicones, pressure-sensitive adhesives, printing inks or varnishes, cannot be sufficiently separated from the substrate, which is actually the main raw material.
  • DE 41 20 685 A1 discloses a laminate material which contains at least one layer of thermoplastic material and has a latent inherent delamination potential.
  • the layer of thermoplastic material carries a separating layer of water-soluble or water-dispersible organic material on at least one side.
  • DE 10 2012 006 416 Al relates to a metal layer-free multilayer film with a basis weight of ⁇ 33 g/m 2 , a shrinkage of ⁇ 10% at 90°C (both in the machine direction and transverse to the machine direction, determined as dimensional change according to DIN 53377) and a at least six-layer layer structure comprising a layer (a) composed of at least one thermoplastic olefin homo- or copolymer as one of the outer layers, an adhesion promoter layer (b), a layer (c) composed of at least one homo- and/or copolyamide, at least one internal gas barrier layer (d) adjacent to layer (c) which differs from layers (c) and (e) at least in the composition of the polymer component(s); a layer (e) composed of at least one homo- and/or copolyamide adjacent to the gas barrier layer (d), and a layer (i) composed of at least one homo- and/or copolyamide as one of the outer layers, a use of
  • DE 10 2014 017 015 A1 discloses a multilayer polymer film comprising at least one middle layer A, the polymeric components of which are soluble in aqueous solution, and at least one essentially water-impermeable cover layer B, C arranged above and below the at least one middle layer A, wherein the layers A, B and C independently of one another each contain at least one thermoplastic polymer and at least one of the cover layers B and C contains at least one polyhydroxyalkanoate, as well as processes for producing the multilayer polymer film and its use for producing molded parts, films or bags.
  • EP 0 569 196 A1 and US 5 419 967 disclose that by adding methacrylate/unsaturated acid and/or vinylamide copolymers, poly(vinyl alcohol) can be melt processed and coextruded with structural polymers such as poly(ethylene terephthalate) to form multilayer films and articles with good adhesion between the components and good barrier properties.
  • EP 0 934 160 B1 relates to a laminated packaging material comprising a layer of paper or cardboard and external liquid-tight coatings of plastic on both sides of the paper or cardboard web.
  • the packaging material is provided with layers of water-soluble polymer between the paper or cardboard layer and each respective external plastic coating, the layers serving as an adhesive or binder.
  • EP 3 885 095 A1 relates to the use of mixtures of water and essential oil for separating multilayer composites for the pure recycling of polymer or metal foils.
  • US 2018 0369859 A1 relates to films that include a water-soluble layer and a vapor-deposited organic coating.
  • the films exhibit improved barrier properties.
  • US 2019 0366591 Al relates to a process for recycling a first polymer from a multicomponent polymer product.
  • US 2020 0055650 Al relates to films comprising a water-soluble polymer material and a vapor-deposited inorganic coating.
  • US 2020 0199313 A1 relates to water-soluble films made from copolymers of butenediol and vinyl alcohol, wherein the films have improved barrier properties (such as low transmission rates for oxygen and water vapor) and good solubility.
  • WO 2000/077082 A1 relates to a process for separating plastic mixtures, with a polyolefinic plastic fraction or a plastic mixture as starting material, in which the starting material is brought into contact with a solvent and the temperature of the solvent-plastic mixture is adjusted so that a solution with at least one dissolved polymer type is formed, wherein the dissolved polymer type is precipitated from the solution under shear in order to separate the polymer type from other components of the solution.
  • WO 2005/118691 A2 relates to a process for recycling polyamides from waste, wherein the waste is mixed with ester solvent and the mixture is heated to a temperature above the melting temperature of the polyolefins contained therein to form a composition containing dissolved polyamide polymer and a separate immiscible liquid polyolefin phase.
  • WO 2020/136674 A1 relates to a recyclable laminate comprising a first layer and a second layer, each layer being a polyolefin layer having a thickness in the range of 12-100 pm; and an intermediate layer having a thickness in the range of 10-35 pm sandwiched between the first polyolefin layer and the second polyolefin layer, the intermediate layer being a metallized polyolefin film having alcohol-based polymer barrier resins therein.
  • a first release layer is a layer of a composition comprising a) a polymer material having at least one hydrogen atom covalently bonded to an oxygen atom, a nitrogen atom or a sulfur atom; and b) a silicone polyether comprising at least one of polyoxoethylene units or polyoxopropylene units.
  • a second release layer comprises a substrate and a coating of the above composition arranged on a major surface of the substrate. The composition of the release liner can advantageously be dissolved and optionally recycled.
  • WO 20222/46173A1 discloses a recyclable laminate film structure comprising a release coating.
  • the release coating facilitates separation of a selected polymer film during recycling processing by selecting the polymer of the coating composition to have certain Hansen solubility parameters such that the laminate structure delaminates at the layer of the coating, leaving clean pieces of the selected polymer film.
  • the release coating is a barrier coating, for example an oxygen barrier coating.
  • water-soluble polymers in particular butenediol-vinyl alcohol copolymer (BVOH) or polyvinyl alcohol (PVOH), can act as a separating layer or predetermined breaking point between the film substrate and the surface coating.
  • BVOH butenediol-vinyl alcohol copolymer
  • PVOH polyvinyl alcohol
  • the separating layer or predetermined breaking point is preferably located on at least one outer side of the substrate, but can also be present within the substrate.
  • the application properties of the final product are not impaired to any relevant extent by the introduction of at least one separating layer or predetermined breaking point based on water-soluble polymer or can be otherwise compensated for by methods familiar to the person skilled in the art.
  • the plastic film according to the invention has good recyclability.
  • a first aspect of the invention relates to a plastic film surface-coated on at least one side, comprising a carrier film with a first outer layer and a second outer layer; and a first surface coating which covers at least part of the first outer layer of the carrier film; wherein the carrier film comprises at least one layer which contains or is based on non-water-soluble polymer, preferably polyolefin, polyester and/or polyamide; and the plastic film contains water-soluble polymer, preferably butenediol-vinyl alcohol copolymer (BVOH) and/or polyvinyl alcohol (PVOH), more preferably butenediol-vinyl alcohol copolymer (BVOH); wherein (i) the carrier film comprises at least one layer which contains or is based on water-soluble polymer, preferably butenediol-vinyl alcohol copolymer (BVOH) and/or polyvinyl alcohol (PVOH), and/or (ii) the first surface coating contains or is based on water-soluble polymer.
  • the carrier film comprises a layer (a) which is based on a water-soluble polymer, preferably butenediol-vinyl alcohol copolymer (BVOH) and/or polyvinyl alcohol (PVOH), and forms the first outer layer of the carrier film; and a layer (c) which is based on a non-water-soluble polymer, preferably polyolefin, polyester and/or polyamide.
  • the layer (a) is arranged between the first surface coating and the layer (c).
  • the layer (a) enables the material of the first surface coating to be separated from the material of the layer (c) due to its water solubility and the subsequent Recycling, in particular of the material of layer (c), which may be in pure form.
  • the plastic film according to the invention can be split along layer (a) into the two materials adjacent to layer (a), ie into the material of the first surface coating and the material of layer (c), optionally together with further layers with which layer (c) can be present in a composite.
  • the carrier film comprises at least one layer which contains non-water-soluble polymer, preferably polyolefin, polyester and/or polyamide, in a mixture with or is based on water-soluble polymer, preferably butenediol-vinyl alcohol copolymer (BVOH) and/or polyvinyl alcohol (PVOH).
  • BVOH butenediol-vinyl alcohol copolymer
  • PVOH polyvinyl alcohol
  • the release properties of the release film are not significantly impaired by the presence of the water-soluble polymer.
  • the release film with release properties is no longer required and can be disposed of properly, the water-soluble polymer in the layer enables the formation of a predetermined breaking point due to its water solubility.
  • the plastic film according to the invention can then be split along the layer into the two materials adjacent to the layer when treated in a water bath, optionally at elevated temperature and after a certain exposure time.
  • a layer is "based" on a particular material if this material is the main component of this layer.
  • the weight proportion of the material does not necessarily have to make up more than 50% by weight of the total weight of the respective layer, but this is preferably the case.
  • a layer is "based" on a particular material if this material makes up at least 70% by weight, more preferably at least 80% by weight, even more preferably at least 90% by weight of this layer, in each case based on the total weight of the respective layer.
  • water-soluble means that the material comes off when the composite (the laminate) is placed in a water bath for a sufficient period of time, e.g. 30 minutes, preferably with stirring and optionally at an elevated temperature, e.g. 60°C.
  • the water bath can contain conventional additives, such as surfactants.
  • non-water-soluble means that the material does not come off under the conditions mentioned above.
  • a polymer is water-soluble or water-insoluble within the meaning of the invention.
  • the water solubility of polymers is preferably determined according to OECD Guideline 105 in the version of July 27, 1995.
  • OECD Directive 120 in the version of 21 January 2000 can be used.
  • the water solubility of polymers is determined in accordance with COMMISSION REGULATION (EC) No 440/2008 of 30 May 2008 laying down test methods pursuant to Regulation (EC) No 1907/2006 of the European Parliament and of the Council on the Registration, Evaluation, Authorisation and Restriction of Chemicals (REACH), in the version of 4 March 2016, by Method A.6 "Water Solubility", which corresponds to OECD Test Guideline (TG) 105 (1995).
  • water-soluble means a solubility in pure water at 20.0 ⁇ 0.5°C of at least 2.0 g/L; accordingly, “water-insoluble” preferably means a solubility of less than 2.0 g/L.
  • This solubility limit was also chosen by the European Chemicals Agency (ECHA) (see Opinion on an Annex XV dossier proposing restrictions on intentionally-added microplastics of 11 June 2020).
  • the water-soluble polymers according to the invention preferably have a water solubility under the conditions mentioned which is significantly above the limit value of 2.0 g/L, preferably at least 5.0 g/L; more preferably at least 10 g/L, even more preferably at least 15 g/L, most preferably at least 20 g/L, and in particular at least 25 g/L.
  • Water-soluble polymers according to the invention are preferably virtually infinitely miscible with water, in particular at elevated temperatures, but then form gels above a certain concentration, the viscosity of which may increase significantly.
  • the water-soluble polymers according to the invention have a solubility such that at a concentration of 10% by weight in pure water with stirring and continuous heating from 20°C to 85°C at a heating rate of 1°C/min, the polymer is practically completely dissolved after no more than 40 minutes (i.e. when 60°C is reached), preferably after no more than 30 minutes (i.e. when 50°C is reached). This requirement is met, for example, by the products under the name Nichigo G-Polymer®.
  • the water-soluble polymers according to the invention have a solubility such that at a concentration of 5.0% by weight in pure water with stirring at 20°C, the polymer is practically completely dissolved after 2 hours at the latest. This requirement is met, for example, by the product under the name Nichigo G-Polymer® AZF8035W.
  • the water-soluble polymers according to the invention have a solubility such that at a concentration of 5.0% by weight in pure water with stirring at a temperature of 70°C, the polymer is practically completely dissolved after 1 hour at the latest. This requirement is met, for example, by the products under the names Nichigo G-Polymer® AZF8035W, OKS-1001 and OKS 8074P.
  • the water-soluble polymers according to the invention have a solubility such that at a concentration of 5.0 wt.% in pure water with stirring at a temperature of 90°C the polymer is practically completely dissolved after 1 hour at the latest. This requirement is met, for example, by products under the names Nichigo G-Polymer® AZF8035W, OKS-1001 and OKS 8074P.
  • a film with a layer thickness of 200 ⁇ m which consists of the pure water-soluble polymer, dissolves completely in a sufficient amount of water at 25°C and with stirring within 6 minutes.
  • Mowiflex® types CI 7, C30, C600, C130T and C500T dissolves completely in a sufficient amount of water at 25°C and with stirring within 6 minutes.
  • the non-water-soluble polymers according to the invention have a water solubility under the conditions mentioned which is significantly below the limit value of 2.0 g/L (2000 mg/L), preferably at most 1000 mg/L; more preferably at most 500 mg/L, even more preferably at most 100 mg/L, most preferably at most 50 mg/L, and in particular at most 10 mg/L.
  • a polymer is considered to be water-soluble if at least 50 g of this polymer can be homogenized in one liter of pure water at 25°C.
  • polyolefins, anhydride-modified polyolefins, acid-modified polyolefins, polyesters and polyamides are preferably considered non-water-soluble polymers, and butenediol-vinyl alcohol copolymers (BVOH) and polyvinyl alcohols (PVOH) are considered water-soluble polymers.
  • BVOH butenediol-vinyl alcohol copolymers
  • PVOH polyvinyl alcohols
  • Suitable water-soluble polymers for the purposes of the invention are commercially available, for example under the names Nichigo G-Polymer® and Mowiflex®.
  • the water-soluble polymer according to the invention is a butenediol-vinyl alcohol copolymer (BVOH) or a polyvinyl alcohol (PVOH)
  • BVOH butenediol-vinyl alcohol copolymer
  • PVOH polyvinyl alcohol
  • vinyl acetate was typically used as a (co)monomer in the polymerization and its ester groups were then at least partially saponified.
  • the degree of saponification is preferably at least 80 mol%, more preferably at least 85 mol%, even more preferably at least 90 mol%, most preferably at least 95 mol% and in particular approximately 100 mol%. It may be preferred if the degree of saponification is not complete, for example at most 99 mol%, or at most 98 mol%, or at most 97 mol%.
  • Butenediol-vinyl alcohol copolymers (BVOH) preferred according to the invention have a melt flow index (MFI) at 210°C and 2160 g in the range of 0.5 to 35 g/10 min, more preferably in the range of 1.0 to 30 g/10 min, even more preferably in the range of 1.5 to 20 g/10 min, most preferably in the range of 2.0 to 10 g/10 min, and in particular in the range of 2.5 to 5.0 g/10 min.
  • MFI melt flow index
  • Polyvinyl alcohols (PVOH) preferred according to the invention have a melt flow index at 190°C and 2160 g in the range of 0.5 to 50 g/10 min, more preferably in the range of 1.0 to 45 g/10 min, even more preferably in the range of 1.5 to 40 g/10 min, most preferably in the range of 2.0 to 35 g/10 min, and in particular in the range of 2.5 to 30 g/10 min.
  • mixtures of several water-soluble polymers for example several polyvinyl alcohols (PVOH) with different degrees of saponification, several butenediol-vinyl alcohol copolymers (BVOH) with different degrees of saponification, or also mixtures of polyvinyl alcohols (PVOH) with butenediol-vinyl alcohol copolymers (BVOH).
  • PVOH polyvinyl alcohols
  • BVOH butenediol-vinyl alcohol copolymers
  • the plastic film according to the invention may comprise further layers in addition to the necessarily present layers and the optional layers.
  • the plastic film according to the invention preferably consists of the necessarily present layers and optionally one or more of the optional layers.
  • the carrier film comprises at least one layer which contains or is based on water-soluble polymer, preferably butenediol-vinyl alcohol copolymer (BVOH) and/or polyvinyl alcohol (PVOH), wherein the plastic film can be split along this layer when treated in a water bath, optionally at elevated temperature and after a sufficient exposure time.
  • water-soluble polymer preferably butenediol-vinyl alcohol copolymer (BVOH) and/or polyvinyl alcohol (PVOH)
  • BVOH butenediol-vinyl alcohol copolymer
  • PVH polyvinyl alcohol
  • the first surface coating is dehesive.
  • “dehesive” means a release force according to FINAT test method FTM10 (Tesa® test adhesive tape 7475, peel speed 300 mm/min, storage conditions 20h/70°C) of at most 50 cN/cm, more preferably at most 40 cN/cm, even more preferably at most 30 cN/cm.
  • the first surface coating is based on polysiloxane.
  • the first surface coating is based on at least one cured polysiloxane, which is preferably selected from the group consisting of addition-crosslinked, preferably metal-catalyzed addition-crosslinked, condensation-crosslinked, radically crosslinked, and/or cationically crosslinked polysiloxanes.
  • the first surface coating is based on at least one cured polysiloxane, which is preferably selected from the group consisting of polydialkylsiloxanes, preferably polydimethylsiloxanes, and polyalkylarylsiloxanes, preferably polymethylphenylsiloxanes.
  • the first surface coating is adhesive
  • the first surface coating is based on a pressure-sensitive adhesive.
  • the pressure-sensitive adhesive is selected from the group consisting of acrylate-based pressure-sensitive adhesives, rubber-based pressure-sensitive adhesives, polyisobutylene-based pressure-sensitive adhesives, and hot melts.
  • the first surface coating is based on printing ink or varnish.
  • the first surface coating in particular when the first surface coating is dehesive, has a basis weight of at most 5.0 g/m 2 , more preferably at most 4.0 g/m 2 , even more preferably at most 3.0 g/m 2 , most preferably at most 2.0 g/m 2 and in particular at most 1.0 g/m 2 .
  • the basis weight is preferably determined according to FINAT test method FTM7.
  • the first surface coating in particular when the first surface coating is adhesive, has a basis weight of at most 100 g/m 2 , more preferably at most 80 g/m 2 , even more preferably at most 60 g/m 2 , most preferably at most 40 g/m 2 and in particular at most 20 g/m 2 .
  • the basis weight is also preferably determined according to FINAT.
  • the first surface coating can cover the first outer side of the carrier film according to the invention partially or completely, preferably completely.
  • the surface coating should be applied as opaquely as possible.
  • the second surface coating is dehesive.
  • the second surface coating is based on polysiloxane.
  • the second surface coating is based on at least one cured polysiloxane, which is preferably selected from the group consisting of addition-crosslinked, preferably metal-catalyzed addition-crosslinked, condensation-crosslinked, radically crosslinked, and/or cationically crosslinked polysiloxanes.
  • the second surface coating is based on at least one cured polysiloxane, which is preferably selected from the group consisting of polydialkylsiloxanes, preferably polydimethylsiloxanes, and polyalkylarylsiloxanes, preferably polymethylphenylsiloxanes.
  • the second surface coating is adhesive.
  • the second surface coating is based on a pressure-sensitive adhesive.
  • the pressure-sensitive adhesive is selected from the group consisting of acrylate-based pressure-sensitive adhesives, rubber-based pressure-sensitive adhesives, polyisobutylene-based pressure-sensitive adhesives, and hot melts.
  • the second surface coating is based on printing ink or varnish.
  • the second surface coating in particular when the second surface coating is dehesive, has a basis weight of at most 5.0 g/m 2 , more preferably at most 4.0 g/m 2 , even more preferably at most 3.0 g/m 2 , most preferably at most 2.0 g/m 2 and in particular at most 1.0 g/m 2 .
  • the basis weight is preferably determined according to FINAT test method FTM7.
  • the second surface coating in particular when the second surface coating is adhesive, has a basis weight of at most 100 g/m 2 , more preferably at most 80 g/m 2 , even more preferably at most 60 g/m 2 , most preferably at most 40 g/m 2 and in particular at most 20 g/m 2 .
  • the basis weight is also preferably determined according to FINAT.
  • the second surface coating can cover the second outside of the carrier film according to the invention partially or completely, preferably completely.
  • the surface coating should be applied as opaquely as possible.
  • the plastic film according to the invention is a plastic film which is surface-coated on at least one side and which
  • a first surface coating which at least partially covers the first outer layer of the carrier film; and optionally a second surface coating which optionally at least partially covers the second outer layer of the carrier film; comprises or consists of;
  • a layer (a) which is based on water-soluble polymer, preferably butenediol-vinyl alcohol copolymer (BVOH) and/or polyvinyl alcohol (PVOH), and forms the first outer layer of the carrier film;
  • BVOH butenediol-vinyl alcohol copolymer
  • PVOH polyvinyl alcohol
  • a layer (c) based on non-water-soluble polymer preferably polyolefin, polyester and/or polyamide;
  • a layer (e) based on water-soluble polymer preferably butenediol-vinyl alcohol copolymer (BVOH) and/or polyvinyl alcohol (PVOH);
  • (f) optionally a layer (f) based on non-water-soluble polymer, preferably polyolefin, polyester and/or polyamide; and
  • (g) optionally comprises or consists of a layer (g) which is based on water-soluble polymer, preferably butenediol-vinyl alcohol copolymer (BVOH) and/or polyvinyl alcohol (PVOH).
  • BVOH butenediol-vinyl alcohol copolymer
  • PVOH polyvinyl alcohol
  • the first surface coating and layers (a) and (c) of the plastic film according to the invention are necessarily present.
  • (d), (e), (f) and (g) are each independently optional.
  • those of the existing layers are arranged in alphabetical order.
  • layer (a) and optionally also layer (e) are based on water-soluble polymer, preferably butenediol-vinyl alcohol copolymer (BVOH) and/or polyvinyl alcohol (PVOH).
  • BVOH butenediol-vinyl alcohol copolymer
  • PVOH polyvinyl alcohol
  • layer (a) is based on extrudable, water-soluble polymer, preferably butenediol-vinyl alcohol copolymer (BVOH) and/or polyvinyl alcohol (PVOH).
  • BVOH butenediol-vinyl alcohol copolymer
  • PVOH polyvinyl alcohol
  • butenediol-vinyl alcohol copolymer (BVOH) is particularly preferred according to the invention because it can be extruded particularly advantageously and can therefore be processed, for example, by blown film coextrusion and at the same time has particularly good water solubility.
  • butenediol-vinyl alcohol copolymer (BVOH) is particularly advantageous compared to polyvinyl alcohol (PVOH) and polyvinyl acetate (PVA).
  • layer (a) is based on one or more water-soluble polymers independently selected from
  • layer (a) is based on one or more water-soluble polymers selected from polymers or copolymers of vinyl acetate, vinylpyrrolidone, ethylene oxide, acrylamide, and lactic acid; preferably polymers or copolymers of vinyl acetate.
  • layer (a) is based on one or more water-soluble polymers independently selected from the group consisting of butenediol-vinyl alcohol copolymer (BVOH), polyvinyl alcohol (PVOH), polyvinyl acetate (PVA), polyvinylpyrrolidone (PVP), polyethylene oxide (PEO), polyacrylamide (PAM), and polylactic acid (PLA); preferably butenediol-vinyl alcohol copolymer (BVOH).
  • BVOH butenediol-vinyl alcohol copolymer
  • PVH polyvinyl alcohol
  • PVA polyvinyl acetate
  • PVP polyvinylpyrrolidone
  • PEO polyethylene oxide
  • PAM polyacrylamide
  • PLA polylactic acid
  • layer (a) is based on one or more water-soluble polymers having an ethylene group content of at most 10 mol%, more preferably at most 5.0 mol%, even more preferably at most 2.5 mol%, and in particular practically no ethylene groups at all.
  • layer (a) is based on one or more water-soluble polymers having a vinyl ester group content of at most 20 mol%, more preferably at most 15 mol%, even more preferably at most 10 mol%, most preferably at most 5.0 mol%, and in particular at most 2.5 mol%.
  • layer (a) is based on one or more water-soluble polymers having a content of vinyl alcohol groups in the range of 40 to 85 mol%, preferably 50 to 75 mol%.
  • layer (a) is based on one or more water-soluble polymers having a content of butylene groups in the range of 15 to 60 mol%, preferably 25 to 50 mol%.
  • layer (a) contains, based on the total weight of layer (a), at least 50% by weight of water-soluble polymer, more preferably at least 60% by weight, even more preferably at least 70% by weight, most preferably at least 80% by weight and in particular at least 90% by weight.
  • layer (a) contains, based on the total weight of layer (a), at most 10 wt.% of non-water-soluble polymer, more preferably 5 wt.%, even more preferably at most 2.5 wt.%, most preferably at most 1.0 wt.%, and in particular practically no non-water-soluble polymer at all.
  • layer (a) has a layer thickness in the range from 0.5 to 100 pm, preferably 0.5 to 25 pm.
  • layer (a) has a layer thickness of at least 1.0 pm, more preferably at least 2.0 pm, even more preferably at least 3.0 pm, most preferably at least 4.0 pm and in particular at least 5.0 pm.
  • layer (a) has a layer thickness of at most 22 pm, more preferably at most 19 pm, even more preferably at most 16 pm, most preferably at most 13 pm and in particular at most 10 pm.
  • layer (a) has a layer thickness of at most 9.0 pm, more preferably at most 8.0 pm, even more preferably at most 7.0 pm, most preferably at most 6.0 pm and in particular at most 5.0 pm.
  • layer (a) has a layer thickness of at most 4.0 pm, more preferably at most 3.0 pm, even more preferably at most 2.5 pm, most preferably at most 2.0 pm and in particular at most 1.75 pm.
  • the adhesion promoter layer (b) is based on anhydride-modified or acid-modified polyolefin.
  • the adhesion promoter layer (b) may optionally contain further polymers, preferably those polymers which are contained in one of the layers adjacent to the adhesion promoter layer (b), i.e. the same water-soluble polymer which is contained in the layer (a) and/or the same non-water-soluble polymer which is contained in the layer (c).
  • the adhesion promoter layer (b) contains, based on the total weight of the adhesion promoter layer (b), at least 30% by weight of non-water-soluble polymer, more preferably at least 40% by weight, even more preferably at least 50% by weight, most preferably at least 60% by weight and in particular at least 70% by weight.
  • the adhesion promoter layer (b) has a layer thickness in the range from 0.5 to 25 pm, preferably 0.5 to 10 pm.
  • the adhesion promoter layer (b) has a layer thickness of at least 1.0 pm, more preferably at least 2.0 pm, even more preferably at least 3.0 pm, most preferably at least 4.0 pm and especially at least 5.0 pm.
  • the adhesion promoter layer (b) has a layer thickness of at most 9.0 pm, more preferably at most 8.0 pm, even more preferably at most 7.0 pm, most preferably at most 6.0 pm and in particular at most 5.0 pm.
  • layer (c) is based on one or more non-water-soluble polymers independently selected from the group consisting of polyolefins, polyesters and polyamides.
  • layer (c) is based on one or more non-water-soluble polymers independently selected from the group consisting of
  • thermoplastic olefin homopolymers and/or
  • thermoplastic olefin copolymers of ⁇ , ⁇ -unsaturated olefins having 2 to 10 carbon atoms are examples of thermoplastic olefin copolymers of ⁇ , ⁇ -unsaturated olefins having 2 to 10 carbon atoms.
  • layer (c) is based on one or more non-water-soluble polymers independently selected from the group consisting of polyethylene, polypropylene, polybutylene, polyisobutylene (PI), copolymers and/or mixtures of at least two of the polymers mentioned.
  • non-water-soluble polymers independently selected from the group consisting of polyethylene, polypropylene, polybutylene, polyisobutylene (PI), copolymers and/or mixtures of at least two of the polymers mentioned.
  • layer (c) contains, based on the total weight of layer (c), at least 50% by weight of non-water-soluble polymer, more preferably at least 60% by weight, even more preferably at least 70% by weight, most preferably at least 80% by weight and in particular at least 90% by weight.
  • layer (c) contains, based on the total weight of layer (a), at most 10 wt.% of water-soluble polymer, more preferably 5 wt.%, even more preferably at most 2.5 wt.%, most preferably at most 1.0 wt.%, and in particular practically no water-soluble polymer at all.
  • layer (c) comprises several layers (ci), (C2), etc.
  • layer (c) is at least three-layered and comprises layer (ci), layer (C2) and layer (C3), wherein layer (C2) is arranged between layers (ci) and (C3).
  • Layers (ci) and (C3) are preferably based on the same non-water-soluble polymer, which preferably differs from the non-water-soluble polymer on which layer (C2) is based.
  • the layer (c) or the layer (C2) is based on polyolefin, preferably olefin homo- or copolymer, which is preferably selected from the group consisting of made of polyethylene, polypropylene, polybutylene, polyisobutylene, polyhexene, polyoctene, copolymers and/or mixtures of at least two of the polymers mentioned.
  • polyolefin preferably olefin homo- or copolymer, which is preferably selected from the group consisting of made of polyethylene, polypropylene, polybutylene, polyisobutylene, polyhexene, polyoctene, copolymers and/or mixtures of at least two of the polymers mentioned.
  • the olefin homopolymer or copolymer of layer (c) or ply (C2) is an ethylene homopolymer or an ethylene copolymer.
  • the ethylene homo- or copolymer of the layer (c) or the ply (C2) is selected from the group consisting of low density polyethylene (LDPE), linear low density polyethylene (LLDPE), medium density polyethylene (MDPE), and high density polyethylene (HDPE).
  • LDPE low density polyethylene
  • LLDPE linear low density polyethylene
  • MDPE medium density polyethylene
  • HDPE high density polyethylene
  • Ethylene homopolymers or copolymers are understood to mean ethylene homopolymers which are based exclusively on ethylene, and ethylene copolymers which, in addition to ethylene, are based on at least one other ⁇ , ⁇ -unsaturated olefin having 3 to 10 carbon atoms.
  • Preferred ethylene homopolymers or copolymers are polyethylene with highly branched polymer chains and a low density in the range from 0.915 to 0.940 g/cm 3 (LDPE); polyethylene with an average density in the range from 0.926 to 0.940 g/cm 3 (MDPE); polyethylene with slightly branched polymer chains and a high density in the range from 0.945 to 0.97 g/cm 3 (HDPE); and linear low density polyethylene with short branched polymer chains, which may contain, in addition to ethylene as a comonomer, one or more higher ⁇ , ⁇ -unsaturated olefins such as butylene, hexene or octene, with a density in the range of 0.915 to 0.94 g/cm 3 (LLDPE).
  • LDPE low density in the range from 0.915 to 0.940 g/cm 3
  • MDPE average density in the range from 0.926 to 0.940 g/cm 3
  • the polyolefin on which the layer (c) or the ply (C2) is based comprises a mixture of an ethylene homo- or copolymer and a propylene homo- or copolymer.
  • the polyolefin on which the layer (c) or the layer (C2) is based comprises a mixture of
  • Propylene homopolymers or copolymers are understood to mean propylene homopolymers which are based exclusively on propylene and propylene copolymers which, in addition to propylene, are based on at least one other ⁇ , ⁇ -unsaturated olefin having 2 to 10 carbon atoms.
  • Preferred propylene homopolymers are isotactic propylene homopolymers, preferably with a melting point in the range from 140 to 170°C.
  • Preferred propylene copolymers are copolymers of propylene and ethylene, the proportion of ethylene preferably being at most 20% by weight, based on the total weight of the propylene copolymer.
  • the layer (c) or the ply (C2) consists of LDPE and a propylene homo- or copolymer.
  • the layer (c) or the ply (C2) consists of LLDPE and a propylene homo- or copolymer.
  • the layer (c) or the layers (ci) and (C3) are each independently based on
  • polyolefin wherein the polyolefin is selected from the group consisting of olefin homo- or copolymers of ⁇ , ⁇ -unsaturated olefins having 2 to 10 carbon atoms; or
  • layer (c) or layers (ci) and (C3) are each independently based on an ethylene-vinyl acetate copolymer.
  • the layer (c) or the layers (ci) and (C3) are each independently based on polyolefin, wherein the polyolefin is selected from the group consisting of olefin homo- or copolymers of ⁇ , ⁇ -unsaturated olefins having 2 to 10 carbon atoms.
  • the polyolefin of layer (c) or of layers (ci) and (C3) is preferably selected, each independently of one another, from the group consisting of polyethylene, polypropylene, polybutylene, polyisobutylene, polyhexene, polyoctene, copolymers and/or mixtures of at least two of the polymers mentioned.
  • the olefin homopolymer or copolymer of layer (c) or of layers (C1) and (C3) is each independently an ethylene homopolymer or an ethylene copolymer.
  • the ethylene homo- or copolymer of layer (c) or of layers (ci) and (C3) is each independently selected from the group consisting of low density polyethylene (LDPE), linear low density polyethylene (LLDPE), medium density polyethylene (MDPE), high density polyethylene (HDPE), and mixtures thereof.
  • LDPE low density polyethylene
  • LLDPE linear low density polyethylene
  • MDPE medium density polyethylene
  • HDPE high density polyethylene
  • the layer (c) or the layers (ci) and (C3) each independently consist of a mixture of two ethylene homo- or copolymers, preferably of a mixture of LDPE with LLDPE, MDPE, or HDPE.
  • the proportion of LDPE is preferably in the range from 10 to 85% by weight and the proportion of the second ethylene homo- or copolymer is preferably in the range from 15 to 90% by weight.
  • layer (c) has a layer thickness in the range from 0.5 to 100 pm, preferably 0.5 to 25 pm.
  • layer (c) has a layer thickness of at least 1.0 pm, more preferably at least 2.0 pm, even more preferably at least 3.0 pm, most preferably at least 4.0 pm and in particular at least 5.0 pm.
  • layer (c) has a layer thickness of at most 22 pm, more preferably at most 19 pm, even more preferably at most 16 pm, most preferably at most 13 pm and in particular at most 10 pm.
  • the adhesion promoter layer (d) is based on anhydride-modified or acid-modified polyolefin.
  • the adhesion promoter layer (d) may optionally contain further polymers, preferably those polymers which are contained in one of the layers adjacent to the adhesion promoter layer (d), i.e. the same water-soluble polymer which is contained in the layer (e) and/or the same non-water-soluble polymer which is contained in the layer (c).
  • the adhesion promoter layer (d) contains, based on the total weight of the adhesion promoter layer (d), at least 30% by weight of non-water-soluble polymer, more preferably at least 40% by weight, even more preferably at least 50% by weight, most preferably at least 60% by weight and in particular at least 70% by weight.
  • the adhesion promoter layer (d) has a layer thickness in the range from 0.5 to 25 pm, preferably 0.5 to 10 pm.
  • the adhesion promoter layer (d) has a layer thickness of at least 1.0 pm, more preferably at least 2.0 pm, even more preferably at least 3.0 pm, most preferably at least 4.0 pm and in particular at least 5.0 pm.
  • the adhesion promoter layer (d) has a layer thickness of at most 9.0 pm, more preferably at most 8.0 pm, even more preferably at most 7.0 pm, most preferably at most 6.0 pm and in particular at most 5.0 pm.
  • the adhesion promoter layer (d) has the same layer structure as the adhesion promoter layer (b).
  • the adhesion promoter layer (d) has a different layer structure than the adhesion promoter layer (b).
  • the layer (e) is based on extrudable, water-soluble polymer, preferably butenediol-vinyl alcohol copolymer (BVOH) and/or polyvinyl alcohol (PVOH).
  • BVOH butenediol-vinyl alcohol copolymer
  • PVOH polyvinyl alcohol
  • the layer (e) is based on one or more water-soluble polymers independently selected from
  • the layer (e) is based on one or more water-soluble polymers selected from polymers or copolymers of vinyl acetate, vinylpyrrolidone, ethylene oxide, acrylamide, and lactic acid; preferably polymers or copolymers of vinyl acetate.
  • the layer (e) is based on one or more water-soluble polymers independently selected from the group consisting of butenediol-vinyl alcohol copolymer (BVOH), polyvinyl alcohol (PVOH), polyvinyl acetate (PVA), polyvinylpyrrolidone (PVP), polyethylene oxide (PEO), polyacrylamide (PAM), and polylactic acid (PLA); preferably butenediol-vinyl alcohol copolymer (BVOH).
  • BVOH butenediol-vinyl alcohol copolymer
  • PVH polyvinyl alcohol
  • PVA polyvinyl acetate
  • PVP polyvinylpyrrolidone
  • PEO polyethylene oxide
  • PAM polyacrylamide
  • PLA polylactic acid
  • BVOH butenediol-vinyl alcohol copolymer
  • the layer (e) is based on one or more water-soluble polymers having an ethylene group content of at most 10 mol%, more preferably at most 5.0 mol%, even more preferably at most 2.5 mol%, and in particular practically no ethylene groups at all.
  • the layer (e) is based on one or more water-soluble polymers having a vinyl ester group content of at most 20 mol%, more preferably at most 15 mol%, even more preferably at most 10 mol%, most preferably at most 5.0 mol%, and in particular at most 2.5 mol%.
  • the layer (e) is based on one or more water-soluble polymers having a content of vinyl alcohol groups in the range of 40 to 85 mol%, preferably 50 to 75 mol%.
  • the layer (e) is based on one or more water-soluble polymers having a content of butylene groups in the range of 15 to 60 mol%, preferably 25 to 50 mol%.
  • layer (e) contains, based on the total weight of layer (e), at least 50% by weight of water-soluble polymer, more preferably at least 60% by weight, even more preferably at least 70% by weight, most preferably at least 80% by weight and in particular at least 90% by weight.
  • layer (e) contains, based on the total weight of layer (e), at most 10 wt.% of non-water-soluble polymer, more preferably 5 wt.%, even more preferably at most 2.5 wt.%, most preferably at most 1.0 wt.%, and in particular practically no non-water-soluble polymer at all.
  • the layer (e) has a layer thickness in the range from 0.5 to 100 pm, preferably 0.5 to 25 pm.
  • the layer (e) has a layer thickness of at least 1.0 pm, more preferably at least 2.0 pm, even more preferably at least 3.0 pm, most preferably at least 4.0 pm and in particular at least 5.0 pm.
  • the layer (e) has a layer thickness of at most 22 pm, more preferably at most 19 pm, even more preferably at most 16 pm, most preferably at most 13 pm and in particular at most 10 pm.
  • the layer (e) has a layer thickness of at most 9.0 pm, more preferably at most 8.0 pm, even more preferably at most 7.0 pm, most preferably at most 6.0 pm and in particular at most 5.0 pm.
  • the layer (e) has a layer thickness of at most 4.0 pm, more preferably at most 3.0 pm, even more preferably at most 2.5 pm, most preferably at most 2.0 pm and in particular at most 1.75 pm.
  • (e) has the same layer structure as layer (a).
  • layer (e) has a different layer structure than layer (a).
  • the layer is based
  • non-water soluble polymers independently selected from the group consisting of polyolefins, polyesters and polyamides.
  • the layer (f) is based on one or more non-water-soluble polymers independently selected from the group consisting of
  • thermoplastic olefin homopolymers and/or
  • thermoplastic olefin copolymers of ⁇ , ⁇ -unsaturated olefins having 2 to 10 carbon atoms are examples of thermoplastic olefin copolymers of ⁇ , ⁇ -unsaturated olefins having 2 to 10 carbon atoms.
  • layer (f) is based on one or more non-water-soluble polymers independently selected from the group consisting of polyethylene, polypropylene, polybutylene, polyisobutylene (PI), copolymers and/or mixtures of at least two of the polymers mentioned.
  • non-water-soluble polymers independently selected from the group consisting of polyethylene, polypropylene, polybutylene, polyisobutylene (PI), copolymers and/or mixtures of at least two of the polymers mentioned.
  • layer (f) contains, based on the total weight of layer (f), at least 50% by weight of non-water-soluble polymer, more preferably at least 60% by weight, even more preferably at least 70% by weight, most preferably at least 80% by weight and in particular at least 90% by weight.
  • layer (f) contains, based on the total weight of layer (f), at most 10 wt.% of water-soluble polymer, more preferably 5 wt.%, even more preferably at most 2.5 wt.%, most preferably at most 1.0 wt.%, and in particular practically no water-soluble polymer at all.
  • layer (f) has a layer thickness in the range from 0.5 to 100 pm, preferably 0.5 to 25 pm.
  • layer (f) has a layer thickness of at least 1.0 pm, more preferably at least 2.0 pm, even more preferably at least 3.0 pm, most preferably at least 4.0 pm and in particular at least 5.0 pm.
  • layer (f) has a layer thickness of at most 22 pm, more preferably at most 19 pm, even more preferably at most 16 pm, most preferably at most 13 pm and in particular at most 10 pm.
  • (f) has the same layer structure as layer (c).
  • layer (f) has a different layer structure than layer (c).
  • BVOH butenediol-vinyl alcohol copolymer
  • PVOH polyvinyl alcohol
  • the layer (g) is based on one or more water-soluble polymers independently selected from
  • layer (g) is based on one or more water-soluble polymers selected from polymers or copolymers of vinyl acetate, vinylpyrrolidone, ethylene oxide, acrylamide, and lactic acid; preferably polymers or copolymers of vinyl acetate.
  • the layer (g) is based on one or more water-soluble polymers independently selected from the group consisting of butenediol-vinyl alcohol copolymer (BVOH), polyvinyl alcohol (PVOH), polyvinyl acetate (PVA), polyvinylpyrrolidone (PVP), polyethylene oxide (PEO), polyacrylamide (PAM), and polylactic acid (PLA); preferably butenediol-vinyl alcohol copolymer (BVOH).
  • BVOH butenediol-vinyl alcohol copolymer
  • PVH polyvinyl alcohol
  • PVA polyvinyl acetate
  • PVP polyvinylpyrrolidone
  • PEO polyethylene oxide
  • PAM polyacrylamide
  • PLA polylactic acid
  • BVOH butenediol-vinyl alcohol copolymer
  • the layer (g) is based on one or more water-soluble polymers having an ethylene group content of at most 10 mol%, more preferably at most 5.0 mol%, even more preferably at most 2.5 mol%, and in particular practically no ethylene groups at all.
  • the layer (g) is based on one or more water-soluble polymers having a vinyl ester group content of at most 20 mol%, more preferably at most 15 mol%, still more preferably at most 10 mol%, most preferably at most 5.0 mol%, and especially at most 2.5 mol%.
  • layer (g) is based on one or more water-soluble polymers having a content of vinyl alcohol groups in the range from 40 to 85 mol%, preferably 50 to 75 mol%.
  • layer (g) is based on one or more water-soluble polymers having a content of butylene groups in the range from 15 to 60 mol%, preferably 25 to 50 mol%.
  • layer (g) contains, based on the total weight of layer (g), at least 50% by weight of water-soluble polymer, more preferably at least 60% by weight, even more preferably at least 70% by weight, most preferably at least 80% by weight and in particular at least 90% by weight.
  • layer (g) contains, based on the total weight of layer (g), at most 10 wt.% of non-water-soluble polymer, more preferably 5 wt.%, even more preferably at most 2.5 wt.%, most preferably at most 1.0 wt.%, and in particular practically no non-water-soluble polymer at all.
  • layer (g) has a layer thickness in the range from 0.5 to 100 pm, preferably 0.5 to 25 pm.
  • layer (g) has a layer thickness of at least 1.0 pm, more preferably at least 2.0 pm, even more preferably at least 3.0 pm, most preferably at least 4.0 pm and in particular at least 5.0 pm.
  • layer (g) has a layer thickness of at most 22 pm, more preferably at most 19 pm, even more preferably at most 16 pm, most preferably at most 13 pm and in particular at most 10 pm.
  • the layer (g) has a layer thickness of at most 9.0 pm, more preferably at most 8.0 pm, even more preferably at most 7.0 pm, most preferably at most 6.0 pm and in particular at most 5.0 pm.
  • the layer (g) has a layer thickness of at most 4.0 pm, more preferably at most 3.0 pm, even more preferably at most 2.5 pm, most preferably at most 2.0 pm and in particular at most 1.75 pm.
  • layer (g) has the same layer structure as layer (e).
  • layer (g) has a different layer structure than layer (e).
  • the plastic film has a total layer thickness in the range of 10 to 250 pm.
  • the plastic film has a total layer thickness of at least 20 pm, more preferably at least 25 pm, even more preferably at least 30 pm, most preferably at least 35 pm and in particular at least 40 pm.
  • the plastic film preferably has a total layer thickness of at most 90 pm, more preferably at most 80 pm, even more preferably at most 70 pm, most preferably at most 60 pm and in particular at most 50 pm.
  • the plastic film according to the invention is extrudable, preferably coextrudable in one step, more preferably by blown film coextrusion.
  • the carrier film has a symmetrical layer structure.
  • layer (b) is arranged between layer (a) and layer (c); is preferably in direct contact with layer (a) and/or with layer (c).
  • layer (c) is arranged between layer (b) and layer (d); preferably, it is in direct contact with layer (b) and/or with layer (d).
  • layer (d) is arranged between layer (c) and layer (e); preferably, it is in direct contact with layer (c) and/or with layer (e).
  • layer (e) is arranged between layer (d) and layer (f); preferably, it is in direct contact with layer (d) and/or with layer (f).
  • layer (f) is arranged between layer (e) and layer (g); preferably, it is in direct contact with layer (e) and/or with layer (g).
  • the plastic film according to the invention has the following structure:
  • - layer (a) which is based on water-soluble polymer, preferably butenediol-vinyl alcohol copolymer (BVOH) and/or polyvinyl alcohol (PVOH), and forms the first outer layer of the carrier film;
  • BVOH butenediol-vinyl alcohol copolymer
  • PVOH polyvinyl alcohol
  • the plastic film according to the invention has the following structure: first surface coating; - layer (a) which is based on water-soluble polymer, preferably butenediol-vinyl alcohol copolymer (BVOH) and/or polyvinyl alcohol (PVOH), and forms the first outer layer of the carrier film;
  • BVOH butenediol-vinyl alcohol copolymer
  • PVOH polyvinyl alcohol
  • - layer (c) based on non-water-soluble polymer, preferably polypropylene;
  • BVOH butenediol-vinyl alcohol copolymer
  • PVOH polyvinyl alcohol
  • the plastic film according to the invention has the following structure:
  • - layer (a) which is based on water-soluble polymer, preferably butenediol-vinyl alcohol copolymer (BVOH) and/or polyvinyl alcohol (PVOH), and forms the first outer layer of the carrier film;
  • BVOH butenediol-vinyl alcohol copolymer
  • PVOH polyvinyl alcohol
  • - layer (c) based on non-water-soluble polymer, preferably polypropylene;
  • BVOH butenediol-vinyl alcohol copolymer
  • PVOH polyvinyl alcohol
  • non-water-soluble polymer preferably polyamide
  • layer (g) which is based on water-soluble polymer, preferably butenediol-vinyl alcohol copolymer (BVOH) and/or polyvinyl alcohol (PVOH); and
  • the carrier film has a layer structure selected from
  • the plastic film has a layer structure selected from (i) dehesive-(a)-(c);
  • the plastic film has a layer structure selected from
  • the plastic film has a layer structure selected from
  • dehesive-(a)-(b)-(c)-(d)-(e)-(f)-adhesive dehesive-(a)-(b)-(c)-(d)-(e)-(g)-adhesive
  • dehesive-(a)-(b)-(c)-(d)-(e)-(g)-adhesive dehesive-(a)-(b)-(c)-(d)-(e)-(f)-(g)-adhesive
  • the plastic film has a layer structure selected from
  • the plastic film according to the invention is a plastic film which is surface-coated on at least one side and which
  • a second surface coating which optionally covers at least part of the second outer layer of the carrier film; comprises or consists of; wherein the carrier film
  • (A) optionally a layer (A) which contains or is based on non-water-soluble polymer, preferably polyolefin, polyester and/or polyamide;
  • (B) optionally an adhesion promoter layer (B);
  • (C) optionally a layer (C) which contains or is based on non-water-soluble polymer, preferably polyolefin, polyester and/or polyamide;
  • (G) optionally a layer (G) which contains or is based on non-water-soluble polymer, preferably polyolefin, polyester and/or polyamide;
  • (H) optionally comprises or consists of an adhesion promoter layer (H); wherein either the layer (A) or the adhesion promoter layer (B) forms the first outer layer of the carrier film and wherein at least one of the layers (A) to (H) and/or the first surface coating contains water-soluble polymer, preferably butenediol-vinyl alcohol copolymer (BVOH) and/or polyvinyl alcohol (PVOH), optionally in a mixture with non-water-soluble polymer, preferably polyolefin, polyester and/or polyamide.
  • water-soluble polymer preferably butenediol-vinyl alcohol copolymer (BVOH) and/or polyvinyl alcohol (PVOH)
  • BVOH butenediol-vinyl alcohol copolymer
  • PVH polyvinyl alcohol
  • the first surface coating and layer (A) or the adhesion promoter layer (B) of the plastic film according to the invention are necessarily present.
  • the second surface coating and layers (C), (D), (E), (F), (G) and (H) are each optional, independently of one another. Preferably, those of the layers present are arranged in alphabetical order.
  • At least one of the layers (A) to (H) and/or the first surface coating contains water-soluble polymer, preferably butenediol-vinyl alcohol copolymer (BVOH) and/or polyvinyl alcohol (PVOH), optionally in a mixture with non-water-soluble polymer, preferably polyolefin, polyester and/or polyamide.
  • water-soluble polymer preferably butenediol-vinyl alcohol copolymer (BVOH) and/or polyvinyl alcohol (PVOH)
  • BVOH butenediol-vinyl alcohol copolymer
  • PVH polyvinyl alcohol
  • the content of water-soluble polymer in at least one layer (A) to (H) contributes significantly to the formation of a type of "predetermined breaking point" and the ability of individual components of the plastic film to be separated from one another.
  • layer (A) and/or layer (C) and/or layer (E) and/or layer (G) each independently contain a mixture of non-water-soluble polymer and water-soluble polymer.
  • the non-water-soluble polymer is independently selected from the group consisting of polyolefins, polyesters and polyamides.
  • the water-soluble polymer is selected from polymers or copolymers of vinyl acetate, vinylpyrrolidone, ethylene oxide, acrylamide, and lactic acid; preferably polymers or copolymers of vinyl acetate.
  • the water-soluble polymer is independently selected from the group consisting of butenediol-vinyl alcohol copolymer (BVOH), polyvinyl alcohol (PVOH), polyvinyl acetate (PVA), polyvinylpyrrolidone (PVP), polyethylene oxide (PEO), polyacrylamide (PAM), and polylactic acid (PLA); preferably butenediol-vinyl alcohol copolymer (BVOH).
  • BVOH butenediol-vinyl alcohol copolymer
  • PVH polyvinyl alcohol
  • PVA polyvinyl acetate
  • PVP polyvinylpyrrolidone
  • PEO polyethylene oxide
  • PAM polyacrylamide
  • PLA polylactic acid
  • BVOH butenediol-vinyl alcohol copolymer
  • the water-soluble polymer has an ethylene group content of at most 10 mol%, more preferably at most 5.0 mol%, even more preferably at most 2.5 mol%, and in particular practically no ethylene groups at all.
  • the water-soluble polymer has a vinyl ester group content of at most 20 mol%, more preferably at most 15 mol%, even more preferably at most 10 mol%, most preferably at most 5.0 mol%, and in particular at most 2.5 mol%.
  • the water-soluble polymer has a content of vinyl alcohol groups in the range of 40 to 85 mol%, preferably 50 to 75 mol%.
  • the water-soluble polymer preferably has a content of butylene groups in the range of 15 to 60 mol%, preferably 25 to 50 mol%.
  • the content of water-soluble polymer is greater than the content of non-water-soluble polymer.
  • the relative weight ratio of water-soluble polymer to non-water-soluble polymer is in the ratio of 10:1 to 1:10, preferably 8:1 to 1:8, more preferably 6:1 to 1:6, even more preferably 4:1 to 1:4, most preferably 3:1 to 1:3 and especially 2:1 to 1:2.
  • the relative weight ratio of water-soluble polymer to non-water-soluble polymer is in the ratio of 11:1 to 1:2, preferably 10:1 to 1:1, more preferably 9:1 to 2:1, even more preferably 8:1 to 3:1, most preferably 7:1 to 4:1 and especially 6:1 to 5:1.
  • layer (A) and/or layer (C) and/or layer (E) and/or layer (G) each independently have a layer thickness in the range from 0.5 to 100 pm, preferably 0.5 to 25 pm.
  • layer (A) and/or layer (C) and/or layer (E) and/or layer (G) each independently have a layer thickness of at least 1.0 pm, more preferably at least 2.0 pm, even more preferably at least 3.0 pm, most preferably at least 4.0 pm and in particular at least 5.0 pm.
  • layer (A) and/or layer (C) and/or layer (E) and/or layer (G) each independently have a layer thickness of at most 22 pm, more preferably at most 19 pm, even more preferably at most 16 pm, most preferably at most 13 pm and in particular at most 10 pm.
  • the adhesion promoter layer (B) and/or the adhesion promoter layer (D) and/or the adhesion promoter layer (F) and/or the adhesion promoter layer (H) each independently contain a mixture of non-water-soluble polymer and water-soluble polymer.
  • the non-water-soluble polymer is independently selected from anhydride-modified and acid-modified polyolefin.
  • the water-soluble polymer is selected from polymers or copolymers of vinyl acetate, vinylpyrrolidone, ethylene oxide, acrylamide, and lactic acid; preferably polymers or copolymers of vinyl acetate.
  • the water-soluble polymer is independently selected from the group consisting of butenediol-vinyl alcohol copolymer (BVOH), polyvinyl alcohol (PVOH), polyvinyl acetate (PVA), polyvinylpyrrolidone (PVP), polyethylene oxide (PEO), polyacrylamide (PAM), and polylactic acid (PLA); preferably butenediol-vinyl alcohol copolymer (BVOH).
  • BVOH butenediol-vinyl alcohol copolymer
  • PVH polyvinyl alcohol
  • PVA polyvinyl acetate
  • PVP polyvinylpyrrolidone
  • PEO polyethylene oxide
  • PAM polyacrylamide
  • PLA polylactic acid
  • BVOH butenediol-vinyl alcohol copolymer
  • the water-soluble polymer has an ethylene group content of at most 10 mol%, more preferably at most 5.0 mol%, even more preferably at most 2.5 mol%, and in particular practically no ethylene groups at all.
  • the water-soluble polymer has a vinyl ester group content of at most 20 mol%, more preferably at most 15 mol%, even more preferably at most 10 mol%, most preferably at most 5.0 mol%, and in particular at most 2.5 mol%.
  • the water-soluble polymer preferably has a content of vinyl alcohol groups in the range of 40 to 85 mol%, preferably 50 to 75 mol%.
  • the water-soluble polymer has a content of butylene groups in the range of 15 to 60 mol%, preferably 25 to 50 mol%.
  • the content of water-soluble polymer is greater than the content of non-water-soluble polymer.
  • the relative weight ratio of water-soluble polymer to non-water-soluble polymer is in the ratio of 10:1 to 1:10, preferably 8:1 to 1:8, more preferably 6:1 to 1:6, even more preferably 4:1 to 1:4, most preferably 3:1 to 1:3 and especially 2:1 to 1:2.
  • the relative weight ratio of water-soluble polymer to non-water-soluble polymer is in the ratio of 11:1 to 1:2, preferably 10:1 to 1:1, more preferably 9:1 to 2:1, even more preferably 8:1 to 3:1, most preferably 7:1 to 4:1 and especially 6:1 to 5:1.
  • non-water-soluble polymer in the range of 15 ⁇ 14 wt.%, preferably 15 ⁇ 12 wt.%, more preferably 15 ⁇ 10 wt.%, even more preferably 15 ⁇ 8.0 wt.%, most preferably 15 ⁇ 6.0 wt.%, and in particular 15 ⁇ 4.0 wt.%.
  • the adhesion promoter layer (B) and/or the adhesion promoter layer (D) and/or the adhesion promoter layer (F) and/or the adhesion promoter layer (H) each independently have a layer thickness in the range from 0.5 to 25 pm, preferably 0.5 to 10 pm.
  • the adhesion promoter layer (B) and/or the adhesion promoter layer (D) and/or the adhesion promoter layer (F) and/or the adhesion promoter layer (H) each independently have a layer thickness of at least 1.0 pm, more preferably at least 2.0 pm, even more preferably at least 3.0 pm, most preferably at least 4.0 pm and in particular at least 5.0 pm.
  • the adhesion promoter layer (B) and/or the adhesion promoter layer (D) and/or the adhesion promoter layer (F) and/or the adhesion promoter layer (H) each independently have a layer thickness of at most 9.0 pm, more preferably at most 8.0 pm, even more preferably at most 7.0 pm, most preferably at most 6.0 pm and in particular at most 5.0 pm.
  • layer (B) is arranged between layer (A) and layer (C); preferably, it is in direct contact with layer (A) and/or with layer (C).
  • layer (C) is arranged between layer (B) and layer (D); preferably, it is in direct contact with layer (B) and/or with layer (D).
  • the layer (D) is arranged between the layer (C) and the layer (E); is preferably in direct contact with the layer (C) and/or with the layer (E).
  • the layer (E) is arranged between the layer (D) and the layer (F); is preferably in direct contact with the layer (D) and/or with the layer (F).
  • the layer (F) is arranged between the layer (E) and the layer (G); is preferably in direct contact with the layer (E) and/or with the layer (G).
  • the layer (G) is arranged between the layer (F) and the layer (H); it is preferably in direct contact with the layer (F) and/or with the layer (H).
  • the plastic film according to the invention has the following structure:
  • adhesion promoter layer (B) which forms the first outer layer of the carrier film; wherein the adhesion promoter layer (B) is preferably based on a water-soluble polymer which is present in a mixture with an adhesion promoter;
  • - layer (C) which contains or is based on non-water-soluble polymer, preferably polypropylene;
  • adhesion promoter layer (D) is preferably based on a water-soluble polymer, preferably butenediol-vinyl alcohol copolymer (BVOH) and/or polyvinyl alcohol (PVOH), which is present in a mixture with an adhesion promoter;
  • BVOH butenediol-vinyl alcohol copolymer
  • PVH polyvinyl alcohol
  • - layer (E) which contains or is based on non-water-soluble polymer, preferably polyamide;
  • adhesion promoter layer (F) is preferably based on a water-soluble polymer, preferably butenediol-vinyl alcohol copolymer (BVOH) and/or polyvinyl alcohol (PVOH), which is present in a mixture with an adhesion promoter;
  • BVOH butenediol-vinyl alcohol copolymer
  • PVH polyvinyl alcohol
  • - layer (G) which contains or is based on non-water-soluble polymer, preferably polypropylene;
  • adhesion promoter layer (H) is preferably based on a water-soluble polymer, preferably butenediol-vinyl alcohol copolymer (BVOH) and/or polyvinyl alcohol (PVOH), which is present in a mixture with an adhesion promoter; and
  • BVOH butenediol-vinyl alcohol copolymer
  • PVH polyvinyl alcohol
  • the first surface coating contains a mixture of polysiloxane and water-soluble polymer, preferably butenediol-vinyl alcohol copolymer (BVOH) and/or polyvinyl alcohol (PVOH).
  • BVOH butenediol-vinyl alcohol copolymer
  • PVOH polyvinyl alcohol
  • the polysiloxane is selected from the group consisting of addition-crosslinked, preferably metal-catalyzed addition-crosslinked, condensation-crosslinked, radically crosslinked, and/or cationically crosslinked polysiloxanes.
  • the polysiloxane is selected from the group consisting of polydialkylsiloxanes, preferably polydimethylsiloxanes, and polyalkylarylsiloxanes, preferably polymethylphenylsiloxanes.
  • the water-soluble polymer is selected from the group consisting of butenediol-vinyl alcohol copolymer (BVOH), polyvinyl alcohol (PVOH), polyvinyl acetate (PVA), polyvinylpyrrolidone (PVP), polyethylene oxide (PEO), polyacrylamide (PAM), and polylactic acid (PLA); preferably butenediol-vinyl alcohol copolymer (BVOH).
  • BVOH butenediol-vinyl alcohol copolymer
  • PVH polyvinyl alcohol
  • PVA polyvinyl acetate
  • PVP polyvinylpyrrolidone
  • PEO polyethylene oxide
  • PAM polyacrylamide
  • PLA polylactic acid
  • BVOH butenediol-vinyl alcohol copolymer
  • the relative weight ratio of water-soluble polymer to polysiloxane is in the ratio of 10:1 to 1:10, preferably 8:1 to 1:8, more preferably 6:1 to 1:6, even more preferably 4:1 to 1:4, most preferably 3:1 to 1:3 and in particular 2:1 to 1:2.
  • the total content of water-soluble polymer contained in the plastic film is at least 0.5 wt.%, more preferably at least 1.0 wt.%, even more preferably at least 2.0 wt.%, most preferably at least 3.0 wt.% and in particular at least 4.0 wt.%.
  • the total content of water-soluble polymer contained in the plastic film is at most 18 wt.%, more preferably at most 16 wt.%, even more preferably at most 14 wt.%, most preferably at most 12 wt.% and in particular at most 10 wt.%.
  • the total content of water-soluble polymer contained in the plastic film is at most 10 wt.%, more preferably at most 9.0 wt.%, even more preferably at most 8.0 wt.%, most preferably at most 7.0 wt.% and in particular at most 6.0 wt.%.
  • All layers of the carrier film according to the invention can contain conventional additives in conventional amounts.
  • Conventional additives are selected from the group consisting of fillers such as CaCO , layered silicates such as talc, plasticizers; lubricants; emulsifiers; pigments; rheology additives; catalysts; flow control agents; impact modifiers, optical brighteners; light stabilizers; antioxidants; clarifying agents such as substituted or unsubstituted bisbenzylidene sorbitols; flame retardants; antistatic agents; UV absorbers such as benzoxazinones; blowing agents; and thiosynergists such as thiodipropionic acid dilauryl esters or thiodipropionic acid distearyl esters.
  • a preferred plasticizer for water-soluble polymers is glycerol.
  • the carrier layer according to the invention can be produced by conventional methods known to those skilled in the art and can then be provided with the first surface coating on the first outer side. Preferred methods are blown film extrusion or casting methods (casting methods).
  • the layers can be applied to the substrate (precursor of the carrier film) by coextrusion (film extrusion), as a polymer coating (extrusion coating) or as an independent coating (coating, printing, varnish) before the first and possibly second surface coating (silicone, adhesive, etc.). Additional adjustments familiar to the person skilled in the art may be necessary for sufficient bonding, such as corona treatment.
  • the plastic film according to the invention can be subjected to conventional recycling processes, which typically include treatment in a water bath.
  • the structure of the plastic film according to the invention now makes it possible to dissolve the water-soluble layer or the water-soluble polymers (almost) without residue during the recycling process.
  • the first and also the second surface coating (silicone, adhesive, etc.) lose their adhesion to the substrate and are washed off.
  • the substrate can then be separated from the washing water as the main raw material, for example by density gradients.
  • the detached surface coating is considered a contaminant and removed or otherwise processed.
  • the resulting aqueous waste which contains the water-soluble polymer, is easy to dispose of when biodegradable and non-environmentally hazardous substances are used and does not negatively affect the sustainability of the new film design.
  • a further aspect of the invention relates to a process for producing a plastic film according to the invention as described above by blown film coextrusion.
  • the extrusion of the plastic film takes place in one step.
  • a further aspect of the invention relates to a plastic film obtainable by the inventive method described above.
  • a further aspect of the invention relates to the use of the above-described plastic film according to the invention for recycling some of its components.
  • the plastic film is split after or during the treatment in a water bath, optionally at elevated temperature and after a sufficient exposure time, along at least one layer which contains or is based on water-soluble polymer, preferably butenediol-vinyl alcohol copolymer (BVOH) and/or polyvinyl alcohol (PVOH).
  • BVOH butenediol-vinyl alcohol copolymer
  • PVOH polyvinyl alcohol
  • Figure 1 shows a schematic cross-section of a plastic film according to the invention with a first surface coating (1), a water-soluble polymer, e.g. BVOH/PVOH based layer (2), a layer based on an adhesion promoter, e.g. PP+MAH (3) and a layer based on a non-water-soluble polymer, e.g. PA (4).
  • a water-soluble polymer e.g. BVOH/PVOH based layer (2)
  • a layer based on an adhesion promoter e.g. PP+MAH
  • PA non-water-soluble polymer
  • Figure 2 shows the treatment of the plastic film shown in Figure 1 in a container (5) which is filled with warm water (6).
  • the water-soluble polymer dissolves in the water (6) so that the layer (2) based on water-soluble polymer is dissolved.
  • the first surface coating (1) dissolves, floats to the water surface and can be disposed of separately or recycled.
  • the separated composite of the layer (3) based on an adhesion promoter and a layer (4) based on a non-water-soluble polymer can then be recycled.
  • Multilayer carrier films are produced by blown film co-extrusion and then provided with a cured polysiloxane coating on one side to provide a dehesive effect.
  • the individual layers are directly adjacent to one another in the order in which they are listed in the table below:
  • Multilayer carrier films are produced by blown film co-extrusion and then provided with a cured polysiloxane coating on one side to provide a dehesive effect.
  • the individual layers are directly adjacent to one another in the order in which they are listed in the table below:
  • Multilayer carrier films are produced by blown film co-extrusion and then coated on one side with a cured polysiloxane coating (dehesive) and a pressure-sensitive adhesive (adhesive).
  • the individual layers are directly adjacent to one another in the order in which they are listed in the table below:
  • Multilayer carrier films are produced by blown film co-extrusion and then provided with a cured polysiloxane coating on one side to provide a dehesive effect.
  • the individual layers are directly adjacent to one another in the order in which they are listed in the table below:
  • Multilayer carrier films are produced by blown film co-extrusion and then coated on one side with a cured polysiloxane coating (dehesive) and a pressure-sensitive adhesive (adhesive).
  • the individual layers are directly adjacent to one another in the order in which they are listed in the table below:
  • a multilayer carrier film is produced by blown film co-extrusion and then provided on one side with a cured polysiloxane coating as a dehesive and a pressure-sensitive adhesive as an adhesive.
  • the individual layers are directly adjacent to one another in the order in which they are listed in the table below:

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

L'invention concerne un film plastique qui présente une surface revêtue sur au moins une face, comprenant un film de support avec une première couche externe et une seconde couche externe ; et un premier revêtement de surface qui recouvre au moins des sections de la surface de la première couche externe du film de support. Le film de support comprend au moins une couche qui contient ou est à base d'un polymère non soluble dans l'eau, et le film plastique contient un polymère soluble dans l'eau, (i) le film de support comprenant au moins une couche qui contient ou est à base d'un polymère soluble dans l'eau, et/ou (ii) le premier revêtement de surface contient ou est à base d'un polymère soluble dans l'eau.
EP23834136.6A 2022-12-19 2023-12-19 Film plastique recyclable revêtu en surface Pending EP4638570A1 (fr)

Applications Claiming Priority (2)

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DE102022213879 2022-12-19
PCT/EP2023/086620 WO2024133243A1 (fr) 2022-12-19 2023-12-19 Film plastique recyclable revêtu en surface

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DE4120685A1 (de) 1991-06-22 1992-12-24 Hoechst Ag Schichtstoffmaterial mit latent inhaerentem delaminierungspotential
US5258230A (en) 1992-05-04 1993-11-02 Rohm And Haas Company High gas barrier co-extruded multiplayer films
SE9503817D0 (sv) 1995-10-30 1995-10-30 Tetra Laval Holdings & Finance Delaminerbart förpackningslaminat samt sätt att framställa detta
DE19927523A1 (de) 1999-06-16 2000-12-21 Wolfgang Lindner Verfahren zur Trennung von polyolefinischen Kunststoffgemischen
WO2005118691A2 (fr) 2004-06-04 2005-12-15 Chemical Products Corporation Separation de polyolefines de polyamides
DE102012006416A1 (de) 2011-12-09 2013-06-13 Maria Soell High Technology Films Gmbh Metallschicht-freie Mehrschichtfolie mit geringem Flächengewicht
DE102014017015A1 (de) 2014-11-19 2016-05-19 Bio-Tec Biologische Naturverpackungen Gmbh & Co. Kg Biologisch abbaubare Mehrschichtfolie
BR112018016530B1 (pt) * 2016-02-15 2022-12-20 Macro Technology Inc Filme multicamada
WO2018187198A1 (fr) 2017-04-07 2018-10-11 The Procter & Gamble Company Films hydrosolubles
US10450119B2 (en) 2017-06-22 2019-10-22 The Procter & Gamble Company Films including a water-soluble layer and a vapor-deposited inorganic coating
EP3641951B1 (fr) 2017-06-22 2023-09-20 The Procter & Gamble Company Films comprenant une couche hydrosoluble et un revêtement organique déposé en phase vapeur
US11787088B2 (en) 2018-06-05 2023-10-17 Braskem S.A. Recycling processes for laminates and multi-layers
WO2020116544A1 (fr) * 2018-12-05 2020-06-11 凸版印刷株式会社 Film barrière au gaz
WO2020136674A1 (fr) 2018-12-26 2020-07-02 Huhtamaki Ppl Limited Stratifié recyclable
EP3885095A1 (fr) 2020-03-23 2021-09-29 Covestro Deutschland AG Utilisation des mélanges d'eau et d'huile essentielle pour séparer des composites multicouche pour le recyclage séparé des feuilles polymères ou métalliques feuilles métalliques
WO2021255544A1 (fr) 2020-06-17 2021-12-23 3M Innovative Properties Company Revêtements antiadhésifs et articles les comprenant
WO2022246173A1 (fr) 2021-05-20 2022-11-24 Sun Chemical Corporation Revêtement barrière à l'oxygène en tant que revêtement de couche de séparation

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