Recyclable surface-coated plastic film

Abstract

The present invention relates to a plastic film having a surface coating on at least one side thereof, the plastic film comprising a carrier film having a first outer layer and a second outer layer, and a first surface coating covering at least a portion of the surface of the first outer layer of the carrier film, wherein the carrier film comprises at least one layer comprising or based on a water-insoluble polymer and the plastic film comprises a water-soluble polymer, and (i) the carrier film comprises at least one layer comprising or based on a water-soluble polymer, and / or (ii) the first surface coating comprises or is based on a water-soluble polymer.

Description

[Technical Field]

[0001] This application claims priority from German Patent Application No. 10 2022 213 879.1, filed December 19, 2022.

[0002] The present invention relates to a plastic film coated on at least one surface, comprising a carrier film having a first outer layer and a second outer layer, and a first surface coating covering at least a portion of the surface of the first outer layer of the carrier film, wherein the carrier film comprises at least one layer comprising or based on a water-insoluble polymer and the plastic film comprises a water-soluble polymer, and (i) the carrier film comprises at least one layer comprising or based on a water-soluble polymer, and / or (ii) the first surface coating comprises or is based on a water-soluble polymer.

[0003] Surface-coated plastic films are used in a wide variety of applications, including, for example, dehesive silicone coatings, tacky pressure-sensitive adhesive coatings, printing inks, and varnishes.

[0004] Such surface coating films cannot be economically or environmentally recycled in the context of a circular economy, since the surface coating, such as a silicone, pressure-sensitive adhesive, printing ink or varnish, cannot be sufficiently separated from the essentially primary substrate material.

[0005] Recycling of coated base materials usually results in downcycling or energy recovery, which is contrary to the spirit of the circular economy. Therefore, in accordance with the spirit of the circular economy, the base material must be separated as cleanly as possible during recycling so that it can be recycled. For example, in the case of a release film with a release silicone coating, this means removing the silicone from the film.

[0006] Various methods for recycling plastic films are known in the art, and recyclable plastic films have also been developed.

[0007] DE 41 20 685 A1 discloses a laminate material with inherent potential separation capabilities, which comprises at least one layer of thermoplastic material, which has on at least one side a separation layer of a water-soluble or water-dispersible organic material.

[0008] DE 10 2012 006 416 A1 has a weight per unit area of ​​33 g / m 2 and a shrinkage characteristic at 90°C (measured as dimensional change in both the machine direction and the transverse direction to the machine direction) of 10% or less according to DIN 53377, the multilayer film having a layer structure with at least six layers including: layer (a) as one of the outer layers composed of at least one thermoplastic olefin homopolymer or copolymer; an adhesion-promoting layer (b); layer (c) composed of at least one homopolyamide and / or copolyamide; at least one inner gas barrier layer (d) adjacent to layer (c) and having a composition of at least one polymer component(s) different from layers (c) and (e); layer (e) adjacent to gas barrier layer (d) and consisting of at least one homopolyamide and / or copolyamide; and layer (i) as one of the outer layers composed of at least one homopolyamide and / or copolyamide; use of such a multilayer film for producing a buoyancy body; and a buoyancy body made from such a multilayer film.

[0009] DE 10 2014 017 015 A1 discloses a multilayer polymer film comprising at least one intermediate layer A, the polymer component of which is soluble in aqueous solution, and at least one substantially water-impermeable cover layer B, C arranged above and below the at least one intermediate layer A, in which the layers A, B and C each independently comprise at least one thermoplastic polymer, and at least one of the cover layers B and C comprises at least one polyhydroxyalkanoate, as well as a method for producing the multilayer polymer film and its use for producing molded articles, films or bags.

[0010] EP 0 569 196 A1 and US 5 419 967 disclose that poly(vinyl alcohol) can be melt processed and co-extruded with structural polymers such as poly(ethylene terephthalate) by adding methacrylic acid / unsaturated acid and / or vinylamide copolymers to form multilayer films and objects with good adhesion between the components and excellent barrier properties.

[0011] EP 0 934 160 B1 relates to a laminated packaging material comprising a paper or cardboard layer and a liquid-tight outer plastic coating applied to both sides of the paper or cardboard web. To facilitate recycling of the material after use, the packaging material is provided with layers of water-soluble polymers between the paper or cardboard layer and each outer plastic coating, which also function as an adhesive or binder.

[0012] EP 3 885 095 A1 relates to the use of a mixture of water and essential oils to separate multi-layer composites such as polymer films and metal foils for recycling by type.

[0013] US 2018 0369859 A1 relates to a film comprising a water-soluble layer and a vapor-deposited organic coating. The film exhibits improved barrier properties.

[0014] US 2019 0366591 A1 relates to a method for recycling a first polymer from a multi-component polymer product.

[0015] US 2020 0055650 A1 relates to a film comprising a water-soluble polymeric material and a vapor-deposited inorganic coating.

[0016] US 2020 0199313 A1 relates to a water-soluble film made of a copolymer of butenediol and vinyl alcohol, which has improved barrier properties (such as low oxygen and water vapor transmission rates) and good solubility.

[0017] WO 2000 / 077082 A1 relates to a process for separating a plastic mixture starting from a polyolefin-based plastic fraction or plastic mixture, in which the starting material is contacted with a solvent, the temperature of the solvent-plastic mixture is adjusted to form a solution in which at least one polymer species is dissolved, and the dissolved polymer species is precipitated from the solution by shearing, separating the polymer species from other components in the solution.

[0018] WO 2005 / 118691 A2 relates to a process for recycling polyamides from waste, in which the waste is mixed with an ester solvent and the mixture is heated to a temperature above the melting point of the polyolefin contained therein, so as to form a composition comprising dissolved polyamide polymer and a separate immiscible liquid phase polyolefin.

[0019] WO 2020 / 136674 A1 relates to a recyclable laminate comprising a first layer and a second layer, each of which is a polyolefin layer having a thickness in the range of 12 to 100 μm, and an intermediate layer having a thickness in the range of 10 to 35 μm sandwiched between the first polyolefin layer and the second polyolefin layer, wherein the intermediate layer is a metallized polyolefin film having an alcohol-based polymer barrier resin therein.

[0020] WO 2021 / 255544 A1 relates to a release liner that can be included in various adhesive products. The first release layer is a layer of a composition comprising: a) a polymeric 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 containing at least one polyoxoethylene unit or polyoxopropylene unit. The second release layer comprises a substrate and a coating of the composition provided on the main surface of the substrate. The release liner composition is advantageously dissolvable and can be recycled as needed.

[0021] WO 20222 / 46173A1 discloses a recyclable laminate film structure containing a release coating. The release coating facilitates separation of the selected polymer film during recycling by selecting the polymer of the coating composition to have a specific Hansen solubility parameter such that the laminate structure peels at the coating layer, leaving clean fragments of the selected polymer film. In certain embodiments, the release coating is a barrier coating, such as an oxygen barrier coating.

[0022] However, the suitability of known surface coating films for use in a circular economy is highly unlikely or at least needs improvement.

[0023] Therefore, one of the aims of the present invention is to adapt and improve the design of surface coating films with a view to a circular economy.

[0024] This object is achieved by the subject matter of the claims.

[0025] It has surprisingly been found that water-soluble polymers, particularly butenediol-vinyl alcohol copolymer (BVOH) or polyvinyl alcohol (PVOH), can act as a release layer or a predetermined fracture point between a film substrate and a surface coating. The focus here is on the use of water-soluble polymers that are biodegradable and environmentally friendly. The release layer or predetermined fracture point is preferably located on at least one outer surface of the substrate, but can also be located within the substrate.

[0026] Furthermore, it has been found that the applicability of the final product is not impaired to any relevant extent by the introduction of at least one release layer or a defined breaking point based on a water-soluble polymer, or can be compensated for in a manner known to those skilled in the art. In the context of a circular economy, the plastic film according to the invention is easily recyclable.

[0027] A first aspect of the present invention relates to a plastic film having a surface coating on at least one side thereof, the plastic film comprising: a carrier film having a first outer layer and a second outer layer; and a first surface coating covering at least a portion of the surface of the first outer layer of the carrier film, wherein the carrier film comprises at least one layer comprising or based on a water-insoluble polymer, preferably polyolefin, polyester, and / or polyamide; the plastic film comprises a water-soluble polymer, preferably butenediol-vinyl alcohol copolymer (BVOH) and / or polyvinyl alcohol (PVOH), more preferably butenediol-vinyl alcohol copolymer (BVOH); and (i) the carrier film comprises at least one layer comprising or based on a water-soluble polymer, preferably butenediol-vinyl alcohol copolymer (BVOH) and / or polyvinyl alcohol (PVOH); and / or (ii) the first surface coating comprises or is based on a water-soluble polymer.

[0028] In a preferred embodiment, the carrier film comprises a layer (a) based on a water-soluble polymer, preferably butenediol-vinyl alcohol copolymer (BVOH) and / or polyvinyl alcohol (PVOH), which forms the first outer layer of the carrier film, and a layer (c) based on a water-insoluble polymer, preferably polyolefin, polyester, and / or polyamide. Layer (a) is disposed between the first surface coating and layer (c). When used as intended, for example, in the case of a release first surface coating as a release film with release properties, the release properties of the release film are not significantly impaired by the presence of layer (a). After intended use, when the release film with release properties is no longer needed and can be disposed of appropriately, the water solubility of layer (a) allows the material of the first surface coating to be separated from the material of layer (c) and then recycled "separately" from the material of layer (c), which may exist in a specific form. The plastic film according to the invention, when treated in a water bath, optionally at elevated temperature and after a certain exposure time, can be split along layer (a) into two materials adjacent to layer (a), namely the material of the first surface coating and the material of layer (c), optionally together with other layers that may be present together with layer (c) in the composite.

[0029] In another preferred embodiment, the carrier film comprises at least one layer containing or based on a water-insoluble polymer, preferably polyolefin, polyester, and / or polyamide, mixed with a water-soluble polymer, preferably butenediol-vinyl alcohol copolymer (BVOH) and / or polyvinyl alcohol (PVOH). Even in this case, when used as intended, for example as a release film, the release properties of the release film are not significantly impaired by the presence of the water-soluble polymer. After intended use, the release film can be disposed of appropriately due to the water-solubility of the water-soluble polymer in the layer. The plastic film of the present invention can then be split into two adjacent materials along the layer when treated in a water bath, optionally at elevated temperatures, for a certain exposure time.

[0030] Unless otherwise specified, all percentages are by weight, and unless otherwise specified, all percentages refer to the total weight of the plastic film of the present invention.

[0031] For convenience, a layer is said to be "based" on a particular material if that material is the predominant component of that layer. The weight percentage of this material does not necessarily have to exceed 50% by weight of the total weight of the respective layer, but preferably does. Typically, a layer is said to be "based" on a particular material if that material constitutes at least 70% by weight of that layer, more preferably at least 80% by weight, and even more preferably at least 90% by weight of the total weight of each layer, in each case.

[0032] For convenience, "water soluble" means that the material will dissolve when the composite (laminate) is placed in a water bath for a sufficient time, e.g., 30 minutes, preferably with stirring, and optionally at an elevated temperature, e.g., 60°C. The water bath can contain common additives such as surfactants. Thus, for convenience, "water insoluble" means that the material will not dissolve under the conditions specified above.

[0033] Preferably, a measurement method for determining whether a polymer is water-soluble or water-insoluble within the meaning of the present invention is used. The water solubility of a polymer is preferably determined according to OECD Guideline 105, as amended on July 27, 1995. Alternatively, reference may be made to OECD Guideline 120, as amended on January 21, 2000. The water solubility of a polymer is measured according to Method A.6 "Water solubility" of OECD Test Guideline (TG) 105 (1995), in accordance with Council Regulation (EC) No. 440 / 2008 of May 30, 2008 (amended on March 4, 2016), which establishes 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).

[0034] Preferably, "water-soluble" means a solubility in pure water of at least 2.0 g / L at 20.0±0.5° C., and thus "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 Annex XV Dossier Proposing Limits for Intentionally Added Microplastics of 11 June 2020).

[0035] Preferably, the water-soluble polymers according to the present invention have a water solubility under the aforementioned conditions that is significantly above the limit 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 especially at least 25 g / L.

[0036] The water-soluble polymers according to the present invention are preferably substantially unlimitedly miscible with water, especially at elevated temperatures, but above a certain concentration they may form gels, the viscosity of which may increase significantly.

[0037] In a preferred embodiment, the water-soluble polymer according to the present invention has a solubility such that a 10% by weight concentration of the polymer in pure water will dissolve substantially completely in 40 minutes or less (i.e., when it reaches 60°C), preferably 30 minutes or less (i.e., when it reaches 50°C) when heated with stirring from 20°C to 85°C at a heating rate of 1°C / min. This requirement is met, for example, by a product called Nichigo G Polymer®.

[0038] In a preferred embodiment, the water-soluble polymer according to the present invention has a solubility such that a concentration of 5.0% by weight of the polymer in purified water is substantially completely dissolved after a maximum of 2 hours when stirred at 20° C. This requirement is met, for example, by a product designated Nichigo G Polymer® AZF8035W.

[0039] In a preferred embodiment, the water-soluble polymer according to the present invention has a solubility such that a concentration of 5.0% by weight of the polymer in purified water is substantially completely dissolved after a maximum of 1 hour when stirred at a temperature of 70° C. This requirement is met, for example, by products designated Nichigo G Polymer® AZF8035W, OKS-1001, and OKS 8074P.

[0040] In a preferred embodiment, the water-soluble polymer according to the present invention has a solubility such that a concentration of 5.0% by weight of the polymer in purified water is substantially completely dissolved after a maximum of one hour when stirred at a temperature of 90° C. This requirement is met, for example, by products designated Nichigo G Polymer® AZF8035W, OKS-1001, and OKS 8074P.

[0041] In a preferred embodiment, a 200 μm thick film of a polymer soluble in pure water dissolves completely within 6 minutes when stirred in a sufficient amount of water at 25° C. This requirement is met, for example, by Mowiflex® brands C17, C30, C600, C130T, and C500T.

[0042] Preferably, the water-insoluble polymers according to the present invention have a water solubility under the aforementioned conditions that is significantly below the limit 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, especially at most 10 mg / L.

[0043] For purposes of the present invention, a polymer is preferably considered to be water soluble if at least 50 g of the polymer can be homogenized in 1 liter of purified water at 25°C.

[0044] For the purposes of the present invention, polyolefins, anhydride-modified polyolefins, acid-modified polyolefins, polyesters, and polyamides are preferably considered to be water-insoluble polymers, while butenediol-vinyl alcohol copolymers (BVOH) and polyvinyl alcohol (PVOH) are considered to be water-soluble polymers, regardless of the solubility quantified (e.g., g / L or mg / L). Suitable water-soluble polymers within the meaning of the present invention are commercially available, for example, under the names Nichigo G Polymer® and Mowiflex®.

[0045] When the water-soluble polymer according to the present invention is a butenediol-vinyl alcohol copolymer (BVOH) or polyvinyl alcohol (PVOH), vinyl acetate is typically used as a (co)monomer in the polymerization, and its ester groups are subsequently at least partially saponified. According to the present invention, 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 particularly about 100 mol%. In some cases, it may be preferable for the degree of saponification to be incomplete, for example, up to 99 mol%, or up to 98 mol%, or up to 97 mol%.

[0046] Suitable butenediol-vinyl alcohol copolymers (BVOH) according to the present invention have a melt flow index (MFI) at 210°C and 2160g in the range of 0.5 to 35g / 10min, more preferably in the range of 1.0 to 30g / 10min, even more preferably in the range of 1.5 to 20g / 10min, most preferably in the range of 2.0 to 10g / 10min, and especially in the range of 2.5 to 5.0g / 10min.

[0047] The preferred polyvinyl alcohol (PVOH) according to the present invention has a melt flow index (MFI) at 190°C and 2160g in the range of 0.5 to 50g / 10min, more preferably in the range of 1.0 to 45g / 10min, even more preferably in the range of 1.5 to 40g / 10min, most preferably in the range of 2.0 to 35g / 10min, and especially in the range of 2.5 to 30g / 10min.

[0048] According to the present invention, a mixture of multiple water-soluble polymers can also be used, for example, multiple polyvinyl alcohols (PVOH) with different degrees of saponification, multiple butenediol-vinyl alcohol copolymers (BVOH) with different degrees of saponification, or a mixture of polyvinyl alcohol (PVOH) and butenediol-vinyl alcohol copolymer (BVOH).

[0049] The plastic film of the present invention may contain other layers in addition to the required layers and optional layers, but it is preferred that the plastic film of the present invention is composed of the required layers and one or more optional layers.

[0050] Preferably, the carrier film comprises at least one layer comprising or based on a water-soluble polymer, preferably butenediol-vinyl alcohol copolymer (BVOH) and / or polyvinyl alcohol (PVOH), and the plastic film can be split along this layer when treated in a water bath, optionally at elevated temperature and after a certain exposure time.

[0051] In a preferred embodiment of the plastic film according to the present invention, the first surface coating has release properties.

[0052] For convenience, "peelable" means that the peel force according to FINAT test method FTM10 (Tesa® test tape 7475, peel rate 300 mm / min, storage conditions 20 hours / 70°C) is 50 cN / cm or less, more preferably 40 cN / cm or less, and even more preferably 30 cN / cm or less.

[0053] Preferably, the first surface coating is polysiloxane based.

[0054] In a preferred embodiment of the plastic film according to the invention, the first surface coating is based on at least one cured polysiloxane, preferably selected from the group consisting of addition-crosslinkable, preferably metal-catalyzed addition-crosslinkable, condensation-crosslinkable, free-radical-crosslinkable and / or cation-crosslinkable polysiloxanes.

[0055] In a preferred embodiment of the plastic film according to the invention, the first surface coating is based on at least one cured polysiloxane, preferably selected from the group consisting of polydialkylsiloxanes, preferably polydimethylsiloxanes, and polyalkylarylsiloxanes, preferably polymethylphenylsiloxanes.

[0056] In another preferred embodiment of the plastic film according to the present invention, the first surface coating has adhesive properties.

[0057] Preferably, the first surface coating is based on a pressure sensitive adhesive.

[0058] In a preferred embodiment of the plastic film according to the present invention, 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.

[0059] In a further preferred embodiment of the plastic film according to the invention, the first surface coating is based on a printing ink or varnish.

[0060] In a preferred embodiment of the plastic film according to the invention, in particular when the first surface coating is peelable, the first surface coating has a weight per unit area of ​​at most 5.0 g / m 2 , more preferably up to 4.0 g / m 2 , and even more preferably up to 3.0 g / m 2 , most preferably up to 2.0 g / m 2 , especially up to 1.0 g / m 2 The weight per unit area is preferably determined according to FINAT test method FTM7.

[0061] In another preferred embodiment of the plastic film according to the invention, in particular when the first surface coating is adhesive, the first surface coating has a weight per unit area of ​​at most 100 g / m 2 , more preferably up to 80 g / m 2 , and even more preferably up to 60 g / m 2 , most preferably up to 40 g / m 2 , especially up to 20 g / m 2 This weight per unit area is also preferably determined in accordance with FINAT.

[0062] The first surface coating can partially or completely, preferably completely, cover the first outer surface of the carrier film according to the invention. To ensure sufficient resistance to moisture and water in the intended application, the surface coating should be applied as completely as possible. Therefore, in the case of a partially coated surface, it is desirable to use, for example, a varnish that can be printed over the entire surface to cover the areas covered with the first surface coating as well as the areas not covered with the first surface coating.

[0063] In a preferred embodiment of the plastic film according to the present invention, the second surface coating has release properties.

[0064] Preferably, the second surface coating is polysiloxane based.

[0065] In a preferred embodiment of the plastic film according to the invention, the second surface coating is based on at least one cured polysiloxane, preferably selected from the group consisting of addition-crosslinkable, preferably metal-catalyzed addition-crosslinkable, condensation-crosslinkable, free-radical-crosslinkable and / or cation-crosslinkable polysiloxanes.

[0066] In a preferred embodiment of the plastic film according to the invention, the second surface coating is based on at least one cured polysiloxane, preferably selected from the group consisting of polydialkylsiloxanes, preferably polydimethylsiloxanes, and polyalkylarylsiloxanes, preferably polymethylphenylsiloxanes.

[0067] In another preferred embodiment of the plastic film according to the invention, the second surface coating has adhesive properties.

[0068] Preferably, the second surface coating is based on a pressure sensitive adhesive.

[0069] Preferably, 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.

[0070] In a further preferred embodiment of the plastic film according to the invention, the second surface coating is based on a printing ink or varnish.

[0071] In a preferred embodiment of the plastic film according to the invention, the second surface coating has a weight per unit area of ​​at most 5.0 g / m, especially when the second surface coating is peelable. 2, more preferably up to 4.0 g / m 2 , and even more preferably up to 3.0 g / m 2 , most preferably up to 2.0 g / m 2 , especially up to 1.0 g / m 2 The weight per unit area is preferably determined according to FINAT test method FTM7.

[0072] In a preferred embodiment of the plastic film according to the invention, in particular when the second surface coating is adhesive, the second surface coating has a weight per unit area of ​​at most 100 g / m 2 , more preferably up to 80 g / m 2 , and even more preferably up to 60 g / m 2 , most preferably up to 40 g / m 2 , especially up to 20 g / m 2 This weight per unit area is also preferably determined in accordance with FINAT.

[0073] The second surface coating can partially or completely, preferably completely, cover the second outer surface of the carrier film according to the present invention. To ensure sufficient resistance to moisture and water in the intended application, the surface coating should be applied as completely as possible. Therefore, in the case of a partially coated surface, it is desirable to use, for example, a varnish that can be printed over the entire surface to cover the areas covered with the second surface coating as well as the areas not covered with the second surface coating.

[0074] In a preferred embodiment, the plastic film according to the present invention is a plastic film having a surface coating applied to at least one surface thereof, a carrier film having a first outer layer and a second outer layer; a first surface coating covering at least a portion of a surface of the first outer layer of the carrier film; optionally a second surface coating optionally covering at least a portion of the surface of the second outer layer of the carrier film; The carrier film is (a) a layer (a) based on a water-soluble polymer, preferably butenediol-vinyl alcohol copolymer (BVOH) and / or polyvinyl alcohol (PVOH), forming a first outer layer of the carrier film; (b) optionally an adhesion promoting layer (b); (c) a layer (c) based on a water-insoluble polymer, preferably a polyolefin, polyester, and / or polyamide; (d) an optional adhesion promoting layer (d); (e) optionally a layer (e) based on a water-soluble polymer, preferably butenediol-vinyl alcohol copolymer (BVOH) and / or polyvinyl alcohol (PVOH); (f) a layer (f) based on a water-insoluble polymer, preferably a polyolefin, polyester, and / or polyamide; (g) a layer (g) based on a water-soluble polymer, preferably butenediol-vinyl alcohol copolymer (BVOH) and / or polyvinyl alcohol (PVOH).

[0075] The first surface coating and layers (a) and (c) of the plastic film of the present invention are required. The second surface coating and layers (b), (d), (e), (f), and (g) are each independently optional. The layers present are preferably arranged in alphabetical order.

[0076] According to these embodiments of the present invention, layer (a) and also optional layer (e) are based on a water-soluble polymer, preferably butenediol-vinyl alcohol copolymer (BVOH) and / or polyvinyl alcohol (PVOH). When used as intended, for example as a release film with release properties, layer (a) and the optional additional layer (e) do not significantly impair the functionality of the plastic film according to the present invention. On the other hand, when the plastic film according to the present invention is applied to a method for recovering (recycling) used raw materials, layer (a) and the optional additional layer (e) significantly contribute to the separability of the individual components of the plastic film from one another.

[0077] In a preferred embodiment of the plastic film according to the invention, layer (a) is based on an extrudable water-soluble polymer, preferably butenediol-vinyl alcohol copolymer (BVOH) and / or polyvinyl alcohol (PVOH).

[0078] According to the invention, butenediol-vinyl alcohol copolymers (BVOH) are particularly preferred because they can be extruded particularly advantageously, for example by coextrusion of blown films, and at the same time have particularly good water solubility, which makes them particularly advantageous compared to polyvinyl alcohol (PVOH) and polyvinyl acetate (PVA).

[0079] Layer (a) is preferably based on one or more water-soluble polymers independently selected from: (i) a completely synthetic water-soluble polymer, and (ii) semi-synthetic or natural water-soluble polymers.

[0080] Preferably, 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 a polymer or copolymer of vinyl acetate.

[0081] In a preferred embodiment of the plastic film according to the present invention, 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).

[0082] Preferably, 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 substantially no ethylene groups.

[0083] Preferably, 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 %, in particular at most 2.5 mol %.

[0084] Preferably, layer (a) is based on one or more water-soluble polymers with a vinyl alcohol group content in the range of 40 to 85 mol %, preferably 50 to 75 mol %.

[0085] Preferably, layer (a) is based on one or more water-soluble polymers with a butylene group content in the range of 15 to 60 mol %, preferably 25 to 50 mol %.

[0086] In a preferred embodiment, layer (a) comprises at least 50% by weight, more preferably at least 60% by weight, even more preferably at least 70% by weight, most preferably at least 80% by weight, especially at least 90% by weight, of water-soluble polymer, based on the total weight of layer (a).

[0087] Layer (a) preferably contains at most 10 wt. %, more preferably 5 wt. %, even more preferably at most 2.5 wt. %, and most preferably at most 1.0 wt. % of a water-insoluble polymer, based on the total weight of layer (a), and in particular is preferably substantially free of any water-insoluble polymer.

[0088] Preferably, layer (a) has a layer thickness in the range of 0.5 to 100 μm, preferably 0.5 to 25 μm.

[0089] In a preferred embodiment of the plastic film according to the present invention, layer (a) has a layer thickness of at least 1.0 μm, more preferably at least 2.0 μm, even more preferably at least 3.0 μm, most preferably at least 4.0 μm, especially at least 5.0 μm.

[0090] In a preferred embodiment of the plastic film according to the invention, layer (a) has a layer thickness of at most 22 μm, more preferably at most 19 μm, even more preferably at most 16 μm, most preferably at most 13 μm, in particular at most 10 μm.

[0091] In a preferred embodiment of the plastic film according to the invention, layer (a) has a layer thickness of at least 9.0 μm, more preferably at least 8.0 μm, even more preferably at least 7.0 μm, most preferably at least 6.0 μm, especially at least 5.0 μm.

[0092] In a preferred embodiment of the plastic film according to the invention, layer (a) has a layer thickness of at least 4.0 μm, more preferably at least 3.0 μm, even more preferably at least 2.5 μm, most preferably at least 2.0 μm, especially at least 1.75 μm.

[0093] In a preferred embodiment of the plastic film according to the invention, the adhesion-promoting layer (b) is based on an anhydride- or acid-modified polyolefin.

[0094] In addition to the anhydride- or acid-modified polyolefin, the adhesion-promoting layer (b) may optionally contain other polymers, preferably polymers contained in one of the layers adjacent to the adhesion-promoting layer (b), i.e., the same water-soluble polymer contained in layer (a) and / or the same water-insoluble polymer contained in layer (c).

[0095] In a preferred embodiment, the adhesion-promoting layer (b) comprises at least 30% by weight, 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, of a water-insoluble polymer, based on the total weight of the adhesion-promoting layer (b).

[0096] Preferably, the adhesion-promoting layer (b) has a layer thickness in the range of 0.5 to 25 μm, preferably 0.5 to 10 μm.

[0097] In a preferred embodiment of the plastic film according to the invention, the adhesion-promoting layer (b) has a layer thickness of at least 1.0 μm, more preferably at least 2.0 μm, even more preferably at least 3.0 μm, most preferably at least 4.0 μm, in particular at least 5.0 μm.

[0098] In a preferred embodiment of the plastic film according to the invention, the adhesion-promoting layer (b) has a layer thickness of at least 9.0 μm, more preferably at least 8.0 μm, even more preferably at least 7.0 μm, most preferably at least 6.0 μm, in particular at least 5.0 μm.

[0099] In a preferred embodiment of the plastic film according to the invention, layer (c) is based on one or more water-insoluble polymers independently selected from the group consisting of polyolefins, polyesters and polyamides.

[0100] Preferably, layer (c) is based on one or more water-insoluble polymers independently selected from: thermoplastic olefin homopolymers, and / or Thermoplastic olefin copolymers of α,β-unsaturated olefins having 2 to 10 carbon atoms.

[0101] Preferably, layer (c) is based on one or more water-insoluble polymers independently selected from the group consisting of polyethylene, polypropylene, polybutylene, polyisobutylene (PI), copolymers and / or mixtures of at least two of these polymers.

[0102] In a preferred embodiment, layer (c) comprises at least 50% by weight, more preferably at least 60% by weight, even more preferably at least 70% by weight, most preferably at least 80% by weight, especially at least 90% by weight, of water-soluble polymer, based on the total weight of layer (c).

[0103] Layer (c) preferably contains at most 10 wt. %, more preferably 5 wt. %, even more preferably at most 2.5 wt. %, and most preferably at most 1.0 wt. % of water-soluble polymer, based on the total weight of layer (a), and in particular is substantially free of water-soluble polymer.

[0104] In a preferred embodiment, layer (c) comprises a plurality of plies (c1), (c2), etc.

[0105] In a particularly preferred embodiment, layer (c) has at least three plies, including plies (c1), (c2), and (c3), with ply (c2) positioned between plies (c1) and (c3). Preferably, plies (c1) and (c3) are based on the same water-insoluble polymer, which is preferably different from the water-insoluble polymer on which ply (c2) is based.

[0106] In a preferred embodiment, layer (c) or ply (c2) is based on a polyolefin, preferably an olefin homopolymer or copolymer, preferably selected from the group consisting of polyethylene, polypropylene, polybutylene, polyisobutylene, polyhexene, polyoctene, copolymers and / or mixtures of at least two of these polymers.

[0107] Preferably, the olefin homopolymer or olefin copolymer of layer (c) or ply (c2) is an ethylene homopolymer or ethylene copolymer.

[0108] Preferably, the ethylene homopolymer or copolymer of layer (c) or 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).

[0109] Ethylene homopolymers or copolymers are understood to mean ethylene homopolymers based solely on ethylene and ethylene copolymers based, in addition to ethylene, on at least one other α,β-unsaturated olefin having from 3 to 10 carbon atoms. Preferred ethylene homopolymers or copolymers are those in which the polymer chains are highly branched and have a viscosity of 0.915 to 0.940 g / cm 3 Low density polyethylene (LDPE) in the range of 0.926~0.940g / cm 3 Polyethylene (MDPE) in the range of 0.945 to 0.97 g / cm 3 and high density polyethylene (HDPE), ranging from 0.915 to 0.94 g / cm, in which the polymer chains are short-chain branched and may contain, in addition to ethylene as a comonomer, one or more higher α,β-unsaturated olefins such as butylene, hexene, or octene. 3 It is a linear low density polyethylene (LLDPE) with a density in the range of

[0110] Preferably, the polyolefin on which layer (c) or ply (c2) is based comprises a mixture of a homopolymer or copolymer of ethylene and a homopolymer or copolymer of propylene.

[0111] In a preferred embodiment, the polyolefin base of the layer (c) or ply (c2), respectively, comprises, relative to the total weight of the mixture: Density 0.91~0.97g / cm 3 51 to 85% by weight of an ethylene homopolymer or copolymer in the range 15 to 49% by weight of a propylene homopolymer or copolymer, Contains a mixture of

[0112] Propylene homopolymers or copolymers are understood to mean propylene homopolymers based solely on propylene and propylene copolymers based on propylene and at least one other α,β-unsaturated olefin having 2 to 10 carbon atoms. Preferred propylene homopolymers are isotactic propylene homopolymers, preferably having a melting point in the range from 140 to 170° C. Preferred propylene copolymers are copolymers of propylene and ethylene, the proportion of ethylene being preferably up to 20% by weight relative to the total weight of the propylene copolymer.

[0113] In a preferred embodiment, layer (c) or ply (c2) is composed of LDPE and a propylene homopolymer or copolymer.

[0114] In another preferred embodiment, layer (c) or ply (c2) is composed of LLDPE and a propylene homopolymer or copolymer.

[0115] Preferably, the layers (c) or plies (c1) and (c3) are each independently based on: a polyolefin selected from the group consisting of olefin homopolymers or copolymers of α,β-unsaturated olefins having 2 to 10 carbon atoms, or Ethylene vinyl acetate copolymer.

[0116] In a preferred embodiment, the layers (c) or plies (c1) and (c3) are each independently based on ethylene vinyl acetate copolymer.

[0117] In another preferred embodiment, layers (c) or plies (c1) and (c3) are each independently based on a polyolefin, the polyolefin being selected from the group consisting of olefin homopolymers or copolymers of α,β-unsaturated olefins having from 2 to 10 carbon atoms.

[0118] In these preferred embodiments, the polyolefins of layers (c) or plies c(1) and (c3) are each independently selected from the group consisting of polyethylene, polypropylene, polybutylene, polyisobutylene, polyhexene, polyoctene, copolymers and / or mixtures of at least two of these polymers.

[0119] Preferably, the olefin homopolymer or copolymer of layer (c) or plies c(1) and (c3) is each independently an ethylene homopolymer or ethylene copolymer.

[0120] Preferably, the ethylene homopolymer or copolymer of layer (c) or plies c(1) and (c3) is 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.

[0121] Preferably, layers (c) or plies (c1) and (c3) each independently consist of a mixture of two ethylene homopolymers or copolymers, preferably a mixture of LDPE and LLDPE, MDPE or HDPE, the proportion of LDPE preferably being in the range of 10-85% by weight and the proportion of the other ethylene homopolymer or copolymer preferably being in the range of 15-90% by weight.

[0122] Preferably, layer (c) has a layer thickness in the range of 0.5 to 100 μm, preferably 0.5 to 25 μm.

[0123] In a preferred embodiment of the plastic film according to the invention, layer (c) has a layer thickness of at least 1.0 μm, more preferably at least 2.0 μm, even more preferably at least 3.0 μm, most preferably at least 4.0 μm, especially at least 5.0 μm.

[0124] In a preferred embodiment of the plastic film according to the invention, layer (c) has a layer thickness of at most 22 μm, more preferably at most 19 μm, even more preferably at most 16 μm, most preferably at most 13 μm, in particular at most 10 μm.

[0125] In a preferred embodiment of the plastic film according to the invention, the adhesion-promoting layer (d) is based on an anhydride- or acid-modified polyolefin.

[0126] In addition to the anhydride- or acid-modified polyolefin, the adhesion-promoting layer (d) may optionally contain other polymers, preferably polymers contained in one of the layers adjacent to the adhesion-promoting layer (d), i.e., the same water-soluble polymers contained in layer (e) and / or the same water-insoluble polymers contained in layer (c).

[0127] In a preferred embodiment, the adhesion-promoting layer (d) comprises at least 30% by weight, more preferably at least 40% by weight, even more preferably at least 50% by weight, most preferably at least 60% by weight, in particular at least 70% by weight, of a water-insoluble polymer, based on the total weight of the adhesion-promoting layer (d).

[0128] Preferably, the adhesion-promoting layer (d) has a layer thickness in the range of 0.5 to 25 μm, preferably 0.5 to 10 μm.

[0129] In a preferred embodiment of the plastic film according to the invention, the adhesion-promoting layer (d) has a layer thickness of at least 1.0 μm, more preferably at least 2.0 μm, even more preferably at least 3.0 μm, most preferably at least 4.0 μm, in particular at least 5.0 μm.

[0130] In a preferred embodiment of the plastic film according to the invention, the adhesion-promoting layer (d) has a layer thickness of at least 9.0 μm, more preferably at least 8.0 μm, even more preferably at least 7.0 μm, most preferably at least 6.0 μm, in particular at least 5.0 μm.

[0131] In a preferred embodiment of the plastic film according to the present invention, the adhesion promoting layer (d) has the same layer structure as the adhesion promoter layer (b).

[0132] In a preferred embodiment of the plastic film according to the present invention, the adhesion promoting layer (d) has a layer structure different from that of the adhesion promoter layer (b).

[0133] In a preferred embodiment of the plastic film according to the invention, layer (e) is based on an extrudable water-soluble polymer, preferably butenediol-vinyl alcohol copolymer (BVOH) and / or polyvinyl alcohol (PVOH).

[0134] Preferably, layer (e) is based on one or more water-soluble polymers independently selected from: (i) a completely synthetic water-soluble polymer, or (ii) semi-synthetic or natural water-soluble polymers.

[0135] Preferably, 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 a polymer or copolymer of vinyl acetate.

[0136] Preferably, 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).

[0137] Preferably, 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 substantially no ethylene groups.

[0138] Preferably, 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 %, in particular at most 2.5 mol %.

[0139] Preferably, layer (e) is based on one or more water-soluble polymers with a vinyl alcohol group content in the range of 40 to 85 mol %, preferably 50 to 75 mol %.

[0140] Preferably, layer (e) is based on one or more water-soluble polymers with a butylene group content ranging from 15 to 60 mol %, preferably from 25 to 50 mol %.

[0141] In a preferred embodiment, layer (e) comprises at least 50% by weight, 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, of water-soluble polymer, based on the total weight of layer (e).

[0142] Layer (e) preferably contains at most 10 wt. %, more preferably 5 wt. %, even more preferably at most 2.5 wt. %, and most preferably at most 1.0 wt. % of a water-insoluble polymer, based on the total weight of layer (e), and in particular preferably contains substantially no water-insoluble polymer.

[0143] Preferably, layer (e) has a layer thickness in the range of 0.5 to 100 μm, preferably 0.5 to 25 μm.

[0144] In a preferred embodiment of the plastic film according to the present invention, layer (e) has a layer thickness of at least 1.0 μm, more preferably at least 2.0 μm, even more preferably at least 3.0 μm, most preferably at least 4.0 μm, especially at least 5.0 μm.

[0145] In a preferred embodiment of the plastic film according to the invention, layer (e) has a layer thickness of at most 22 μm, more preferably at most 19 μm, even more preferably at most 16 μm, most preferably at most 13 μm, in particular at most 10 μm.

[0146] In a preferred embodiment of the plastic film according to the invention, layer (e) has a layer thickness of at least 9.0 μm, more preferably at least 8.0 μm, even more preferably at least 7.0 μm, most preferably at least 6.0 μm, especially at least 5.0 μm.

[0147] In a preferred embodiment of the plastic film according to the invention, layer (e) has a layer thickness of at least 4.0 μm, more preferably at least 3.0 μm, even more preferably at least 2.5 μm, most preferably at least 2.0 μm, especially at least 1.75 μm.

[0148] In a preferred embodiment of the plastic film according to the present invention, the layer (e) has the same layer structure as the layer (a).

[0149] In a preferred embodiment of the plastic film according to the present invention, the layer (e) has a layer structure different from that of the layer (a).

[0150] In a preferred embodiment of the plastic film according to the invention, layer (f) is based on one or more water-insoluble polymers independently selected from the group consisting of polyolefins, polyesters and polyamides.

[0151] Preferably, layer (f) is based on one or more water-insoluble polymers independently selected from: thermoplastic olefin homopolymers, and / or Thermoplastic olefin copolymers of α,β-unsaturated olefins having 2 to 10 carbon atoms.

[0152] Preferably, layer (f) is based on one or more water-insoluble polymers independently selected from the group consisting of polyethylene, polypropylene, polybutylene, polyisobutylene (PI), copolymers and / or mixtures of at least two of these polymers.

[0153] In a preferred embodiment, layer (f) comprises at least 50% by weight, more preferably at least 60% by weight, even more preferably at least 70% by weight, most preferably at least 80% by weight, in particular at least 90% by weight, of water-soluble polymer, based on the total weight of layer (f).

[0154] Layer (f) preferably contains at most 10 wt. %, preferably 5 wt. %, even more preferably at most 2.5 wt. %, and most preferably at most 1.0 wt. % of water-soluble polymer relative to the total weight of layer (f), and in particular preferably contains substantially no water-soluble polymer.

[0155] Preferably, layer (f) has a layer thickness in the range of 0.5 to 100 μm, preferably 0.5 to 25 μm.

[0156] In a preferred embodiment of the plastic film according to the invention, layer (f) has a layer thickness of at least 1.0 μm, more preferably at least 2.0 μm, even more preferably at least 3.0 μm, most preferably at least 4.0 μm, especially at least 5.0 μm.

[0157] In a preferred embodiment of the plastic film according to the invention, layer (f) has a layer thickness of at most 22 μm, more preferably at most 19 μm, even more preferably at most 16 μm, most preferably at most 13 μm, in particular at most 10 μm.

[0158] In a preferred embodiment of the plastic film according to the present invention, the layer (f) has the same layer structure as the layer (c).

[0159] In a preferred embodiment of the plastic film according to the present invention, the layer (f) has a layer structure different from that of the layer (c).

[0160] In a preferred embodiment of the plastic film according to the invention, layer (g) is based on an extrudable water-soluble polymer, preferably butenediol-vinyl alcohol copolymer (BVOH) and / or polyvinyl alcohol (PVOH).

[0161] Preferably, layer (g) is based on one or more water-soluble polymers independently selected from: (i) a completely synthetic water-soluble polymer, or (ii) semi-synthetic or natural water-soluble polymers.

[0162] Preferably, 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 a polymer or copolymer of vinyl acetate.

[0163] Preferably, 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).

[0164] Preferably, 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 substantially no ethylene groups.

[0165] Preferably, 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 %, even more preferably at most 10 mol %, most preferably at most 5.0 mol %, in particular at most 2.5 mol %.

[0166] Preferably, layer (g) is based on one or more water-soluble polymers with a vinyl alcohol group content in the range of 40 to 85 mol %, preferably 50 to 75 mol %.

[0167] Preferably, layer (g) is based on one or more water-soluble polymers with a butylene group content in the range of 15 to 60 mol %, preferably 25 to 50 mol %.

[0168] In a preferred embodiment, layer (g) comprises at least 50% by weight, more preferably at least 60% by weight, even more preferably at least 70% by weight, most preferably at least 80% by weight, in particular at least 90% by weight, of water-soluble polymer, based on the total weight of layer (g).

[0169] Layer (g) preferably contains at most 10 wt. %, more preferably 5 wt. %, even more preferably at most 2.5 wt. %, and most preferably at most 1.0 wt. % of a water-insoluble polymer relative to the total weight of layer (g), and in particular preferably contains substantially no water-insoluble polymer.

[0170] Preferably, layer (g) has a layer thickness in the range of 0.5 to 100 μm, preferably 0.5 to 25 μm.

[0171] In a preferred embodiment of the plastic film according to the present invention, layer (g) has a layer thickness of at least 1.0 μm, more preferably at least 2.0 μm, even more preferably at least 3.0 μm, most preferably at least 4.0 μm, especially at least 5.0 μm.

[0172] In a preferred embodiment of the plastic film according to the invention, layer (g) has a layer thickness of at most 22 μm, more preferably at most 19 μm, even more preferably at most 16 μm, most preferably at most 13 μm, in particular at most 10 μm.

[0173] In a preferred embodiment of the plastic film according to the invention, layer (g) has a layer thickness of at least 9.0 μm, more preferably at least 8.0 μm, even more preferably at least 7.0 μm, most preferably at least 6.0 μm, especially at least 5.0 μm.

[0174] In a preferred embodiment of the plastic film according to the invention, layer (g) has a layer thickness of at least 4.0 μm, more preferably at least 3.0 μm, even more preferably at least 2.5 μm, most preferably at least 2.0 μm, in particular at least 1.75 μm.

[0175] In a preferred embodiment of the plastic film according to the present invention, the layer (g) has the same layer structure as the layer (e).

[0176] In a preferred embodiment of the plastic film according to the present invention, the layer (g) has a layer structure different from that of the layer (e).

[0177] In a preferred embodiment of the plastic film according to the present invention, the plastic film has a total layer thickness in the range of 10 to 250 μm.

[0178] It is preferred that the plastic film has a total layer thickness of at least 20 μm, more preferably at least 25 μm, even more preferably at least 30 μm, most preferably at least 35 μm, especially at least 40 μm.

[0179] Preferably, the plastic film has a total layer thickness of at most 90 μm, more preferably at most 80 μm, even more preferably at most 70 μm, most preferably at most 60 μm, especially at most 50 μm.

[0180] Preferably, the plastic film according to the present invention is extrudable, preferably by single-stage coextrusion, more preferably by blown film coextrusion.

[0181] In a preferred embodiment of the plastic film according to the invention, the carrier film has a symmetrical layer structure.

[0182] Preferably, layer (b) is disposed between layer (a) and layer (c), and is preferably in direct contact with layer (a) and / or layer (c).

[0183] Preferably, layer (c) is disposed between layer (b) and layer (d), and is preferably in direct contact with layer (b) and / or layer (d).

[0184] Preferably, layer (d) is disposed between layer (c) and layer (e), and is preferably in direct contact with layer (c) and / or layer (e).

[0185] Preferably, layer (e) is disposed between layer (d) and layer (f), and is preferably in direct contact with layer (d) and / or layer (f).

[0186] Preferably, layer (f) is disposed between layer (e) and layer (g), and is preferably in direct contact with layer (e) and / or layer (g).

[0187] In a preferred embodiment, the plastic film according to the present invention has the following structure: a first surface coating; a layer (a) based on a water-soluble polymer, preferably butenediol-vinyl alcohol copolymer (BVOH) and / or polyvinyl alcohol (PVOH), forming the first outer layer of the carrier film; an adhesion-promoting layer (b), and A layer (c) based on a water-insoluble polymer, preferably polypropylene.

[0188] In a further preferred embodiment, the plastic film according to the present invention has the following structure: a first surface coating; a layer (a) based on a water-soluble polymer, preferably butenediol-vinyl alcohol copolymer (BVOH) and / or polyvinyl alcohol (PVOH), forming the first outer layer of the carrier film; Adhesion promoting layer (b), a layer (c) based on a water-insoluble polymer, preferably polypropylene, Adhesion promoting layer (d), a layer (e) based on a water-soluble polymer, preferably butenediol-vinyl alcohol copolymer (BVOH) and / or polyvinyl alcohol (PVOH), and Second surface coating.

[0189] In another preferred embodiment, the plastic film according to the present invention has the following structure: a first surface coating; a layer (a) based on a water-soluble polymer, preferably butenediol-vinyl alcohol copolymer (BVOH) and / or polyvinyl alcohol (PVOH), forming the first outer layer of the carrier film; Adhesion promoting layer (b), a layer (c) based on a water-insoluble polymer, preferably polypropylene, Adhesion promoting layer (d), a layer (e) based on a water-soluble polymer, preferably butenediol-vinyl alcohol copolymer (BVOH) and / or polyvinyl alcohol (PVOH), a layer (f) based on a water-insoluble polymer, preferably polyamide, Optionally, a layer (g) based on a water-soluble polymer, preferably butenediol-vinyl alcohol copolymer (BVOH) and / or polyvinyl alcohol (PVOH), and Second surface coating.

[0190] In a preferred embodiment of the plastic film according to the present invention, the carrier film has a layer structure selected from the following: (i)(a)-(c), (ii)(a)-(b)-(c), (a)-(c)-(d), (a)-(c)-(e), (a)-(c)-(f), (a)-(c)-(g), (iii)(a)-(b)-(c)-(d), (a)-(b)-(c)-(e), (a)-(b)-(c)-(f), (a)-(b)-(c)-(g), (a)-( c)-(d)-(e), (a)-(c)-(d)-(f), (a)-(c)-(d)-(g), (a)-(c)-(e)-(f), (a)-(c)-(e)-(g), (iv)(a)-(b)-(c)-(d)-(e), (a)-(b)-(c)-(d)-(f), (a)-(b)-(c)-(d)-(g), (a)-(b)-(c)-(e)-(f ), (a)-(b)-(c)-(e)-(g), (a)-(c)-(d)-(e)-(f), (a)-(c)-(d)-(e)-(g), (a)-(c)-(e)-(f)-(g), (v)(a)-(b)-(c)-(d)-(e)-(f), (a)-(b)-(c)-(d)-(e)-(g), and (vi)(a)-(b)-(c)-(d)-(e)-(f)-(g).

[0191] In a preferred embodiment of the plastic film according to the present invention, the plastic film has a layer structure selected from the following: (i) release agents—(a)-(c); (ii) Stripping agent-(a)-(b)-(c), stripping agent-(a)-(c)-(d), stripping agent-(a)-(c)-(e), stripping agent-(a)-(c)-(f), stripping agent-(a)-(c)-(g), (iii) stripping agent-(a)-(b)-(c)-(d), stripping agent-(a)-(b)-(c)-(e), stripping agent-(a)-(b)-(c)-(f), stripping agent-(a)-(b)-(c)-(g), stripping agent-(a)-(c)-(d)-(e), stripping agent-(a)-(c)-(d)-(f), stripping agent-(a)-(c)-(d)-(g), stripping agent-(a)-(c)-(e)-(f), stripping agent-(a)-(c)-(e)-(g, (iv) stripping agent-(a)-(b)-(c)-(d)-(e), stripping agent-(a)-(b)-(c)-(d)-(f), stripping agent-(a)-(b)-(c)-(d)-(g), stripping agent-(a)-(b)-(c)-(e)-(f), stripping agent-(a)-(b)-(c)-(e)-(g), stripping agent-(a)-(c)-(d)-(e)-(f), stripping agent-(a)-(c)-(d)-(e)-(g), stripping agent-(a)-(c)-(e)-(f)-(g, (v) Release agents-(a)-(b)-(c)-(d)-(e)-(f), Release agents-(a)-(b)-(c)-(d)-(e)-(g), and (vi) Stripping agents-(a)-(b)-(c)-(d)-(e)-(f)-(g). It should be noted that "release agent" refers to a release surface coating.

[0192] In a preferred embodiment of the plastic film according to the present invention, the plastic film has a layer structure selected from the following: (i) release agent—(a)-(c)—release agent; (ii) stripper-(a)-(b)-(c)-stripping agent, stripper-(a)-(c)-(d)-stripping agent, stripper-(a)-(c)-(e)-stripping agent, stripper-(a)-(c)-(f)-stripping agent, stripper-(a)-(c)-(g)-stripping agent, (iii) release agent-(a)-(b)-(c)-(d)-release agent, release agent-(a)-(b)-(c)-(e)-release agent, release agent-(a)-(b)-(c)-(f)-release agent, release agent-(a)-(b)-(c)-(g)-release agent, release agent-(a)-(c)-(d)-(e)-release agent, release agent-(a)-(c)-(d)-(f)-release agent, release agent-(a)-(c)-(d)-(g)-release agent, release agent-(a)-(c)-(e)-(f)-release agent, release agent-(a)-(c)-(e)-(g)-release agent, (iv) stripper-(a)-(b)-(c)-(d)-(e)-stripping agent, stripper-(a)-(b)-(c)-(d)-(f)-stripping agent, stripper-(a)-(b)-(c)-(d)-(g)-stripping agent, stripper-(a)-(b)-(c)-(e)-(f)-stripping agent, stripper-(a)-(b)-(c)-(e)-(g)-stripping agent, stripper-(a)-(c)-(d)-(e)-(f)-stripping agent, stripper-(a)-(c)-(d)-(e)-(g)-stripping agent, stripper-(a)-(c)-(e)-(f)-(g)-stripping agent, (v) release agent-(a)-(b)-(c)-(d)-(e)-(f)-release agent, release agent-(a)-(b)-(c)-(d)-(e)-(g)-release agent, and (vi) Stripping agents-(a)-(b)-(c)-(d)-(e)-(f)-(g)-Stripping agents. It should be noted that "release agent" refers to a release surface coating.

[0193] In a preferred embodiment of the plastic film according to the present invention, the plastic film has a layer structure selected from the following: (i) release agent-(a)-(c)-adhesive; (ii) release agent-(a)-(b)-(c)-adhesive, release agent-(a)-(c)-(d)-adhesive, release agent-(a)-(c)-(e)-adhesive, release agent-(a)-(c)-(f)-adhesive, release agent-(a)-(c)-(g)-release agent, (iii) release agent-(a)-(b)-(c)-(d)-adhesive, release agent-(a)-(b)-(c)-(e)-adhesive, release agent-(a)-(b)-(c)-(f)-adhesive, release agent-(a)-(b)-(c)-(g)-adhesive, release agent-(a)-(c)-(d)-(e)-adhesive, release agent-(a)-(c)-(d)-(f)-adhesive, release agent-(a)-(c)-(e)-(f)-adhesive, release agent-(a)-(c)-(e)-(g)-adhesive, (iv) release agent-(a)-(b)-(c)-(d)-(e)-adhesive, release agent-(a)-(b)-(c)-(d)-(f)-adhesive, release agent-(a)-(b)-(c)-(d)-(g)-adhesive, release agent-(a)-(b)-(c)-(e)-(f)-adhesive, release agent-(a)-(b)-(c)-(e)-(g)-adhesive, release agent-(a)-(c)-(d)-(e)-(f)-adhesive, release agent-(a)-(c)-(d)-(e)-(g)-adhesive, release agent-(a)-(c)-(e)-(f)-(g)-adhesive, (v) release agent-(a)-(b)-(c)-(d)-(e)-(f)-adhesive, release agent-(a)-(b)-(c)-(d)-(e)-(g)-adhesive, and (vi) Release agents-(a)-(b)-(c)-(d)-(e)-(f)-(g)-Adhesives. It should be noted that "release agent" refers to a release surface coating, and "adhesive" refers to an adhesive surface coating.

[0194] In a preferred embodiment of the plastic film according to the present invention, the plastic film has a layer structure selected from the following: (i) adhesive-(a)-(c)-release agent; (ii) adhesive-(a)-(b)-(c)-release agent, adhesive-(a)-(c)-(d)-release agent, adhesive-(a)-(c)-(e)-release agent, adhesive-(a)-(c)-(f)-release agent, adhesive-(a)-(c)-(g)-release agent, (iii) adhesive-(a)-(b)-(c)-(d)-release agent, adhesive-(a)-(b)-(c)-(e)-release agent, adhesive-(a)-(b)-(c)-(f)-release agent, adhesive-(a)-(b)-(c)-(g)-release agent, adhesive-(a)-(c)-(d)-(e)-release agent, adhesive-(a)-(c)-(d)-(f)-release agent, adhesive-(a)-(c)-(d)-(g)-release agent, adhesive-(a)-(c)-(e)-(f)-release agent, adhesive-(a)-(c)-(e)-(g)-release agent, (iv) adhesive-(a)-(b)-(c)-(d)-(e)-release agent, adhesive-(a)-(b)-(c)-(d)-(f)-release agent, adhesive-(a)-(b)-(c)-(d)-(g)-release agent, adhesive-(a)-(b)-(c)-(e)-(f)-release agent, adhesive-(a)-(b)-(c)-(e)-(g)-release agent, adhesive-(a)-(c)-(d)-(e)-(f)-release agent, adhesive-(a)-(c)-(d)-(e)-(g)-release agent, adhesive-(a)-(c)-(e)-(f)-(g)-release agent, (v) adhesive-(a)-(b)-(c)-(d)-(e)-(f)-release agent, adhesive-(a)-(b)-(c)-(d)-(e)-(g)-release agent, and (vi) Adhesives-(a)-(b)-(c)-(d)-(e)-(f)-(g)-Releasers. It should be noted that "release agent" refers to a release surface coating, and "adhesive" refers to an adhesive surface coating.

[0195] In a further preferred embodiment, the plastic film according to the present invention is a plastic film having a surface coating applied to at least one surface thereof, a carrier film having a first outer layer and a second outer layer; a first surface coating covering at least a portion of a surface of the first outer layer of the carrier film; optionally a second surface coating optionally covering at least a portion of the surface of the second outer layer of the carrier film; The carrier film is (A) optionally a layer (A) comprising or based on a water-insoluble polymer, preferably a polyolefin, a polyester, and / or a polyamide; (B) optionally an adhesion promoting layer (B); (C) optionally a layer (C) comprising or based on a water-insoluble polymer, preferably a polyolefin, a polyester, and / or a polyamide; (D) optionally an adhesion promoting layer (D); (E) optionally a layer (E) comprising or based on a water-insoluble polymer, preferably a polyolefin, polyester, and / or polyamide; (F) optionally an adhesion promoting layer (F); (G) optionally a layer (G) comprising or based on a water-insoluble polymer, preferably a polyolefin, polyester, and / or polyamide; (H) optionally an adhesion promoting layer (H); Either layer (A) or adhesion-promoting layer (B) forms the first outer layer of the carrier film, and at least one of layers (A)-(H) and / or the first surface coating comprises a water-soluble polymer, preferably butenediol-vinyl alcohol copolymer (BVOH) and / or polyvinyl alcohol (PVOH), optionally mixed with a water-insoluble polymer, preferably polyolefin, polyester, and / or polyamide.

[0196] The plastic film of the present invention is always provided with a first surface coating and layer (A) or adhesion-promoting layer (B). The second surface coating and layers (C), (D), (E), (F), (G) and (H) are each optional and independent of each other. The layers present are preferably arranged in alphabetical order.

[0197] According to these embodiments of the present invention, at least one of the layers (A)-(H) and / or the first surface coating comprises a water-soluble polymer, preferably butenediol-vinyl alcohol copolymer (BVOH) and / or polyvinyl alcohol (PVOH), optionally mixed with a water-insoluble polymer, preferably polyolefin, polyester, and / or polyamide. When used as intended, for example as a release film with release properties, the presence of the water-soluble polymer does not significantly impair the functionality of the plastic film or each layer of the present invention. On the other hand, when the plastic film of the present invention is subjected to a method for recovering (recycling) used raw materials, the content of the water-soluble polymer in at least one of the layers (A)-(H) significantly contributes to the formation of a certain "predetermined breaking point" and the ability of the individual components of the plastic film to separate from each other.

[0198] In a preferred embodiment, layer (A) and / or layer (C) and / or layer (E) and / or layer (G) each independently comprise a mixture of a water-insoluble polymer and a water-soluble polymer.

[0199] Preferably, the water-insoluble polymers are independently selected from the group consisting of polyolefins, polyesters, and polyamides.

[0200] Preferably, the water-soluble polymer is selected from polymers or copolymers of vinyl acetate, vinylpyrrolidone, ethylene oxide, acrylamide, and lactic acid, preferably a polymer or copolymer of vinyl acetate.

[0201] Preferably, the water-soluble polymers are 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), and preferably butenediol-vinyl alcohol copolymer (BVOH).

[0202] The water-soluble polymer preferably 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 especially preferably is substantially free of ethylene groups.

[0203] Preferably, 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 %, especially at most 2.5 mol %.

[0204] The water-soluble polymer preferably has a vinyl alcohol group content in the range of 40 to 85 mol %, more preferably 50 to 75 mol %.

[0205] The water-soluble polymer preferably has a butylene group content in the range of 15 to 60 mol %, more preferably 25 to 50 mol %.

[0206] Preferably, the content of the water-soluble polymer is greater than the content of the water-insoluble polymer.

[0207] Preferably, the relative weight ratio of water-soluble polymer to water-insoluble polymer is from 10:1 to 1:10, preferably from 8:1 to 1:8, more preferably from 6:1 to 1:6, even more preferably from 4:1 to 1:4, most preferably from 3:1 to 1:3, especially from 2:1 to 1:2.

[0208] Preferably, the relative weight ratio of water-soluble polymer to water-insoluble polymer is from 11:1 to 1:2, preferably from 10:1 to 1:1, more preferably from 9:1 to 2:1, even more preferably from 8:1 to 3:1, most preferably from 7:1 to 4:1, especially from 6:1 to 5:1.

[0209] In a preferred embodiment, each layer (A), (C), (E) or (G) has, independently of each other, the content of water-soluble polymer is in the range of 85±14 wt.%, preferably 85±12 wt.%, more preferably 85±10 wt.%, even more preferably 85±8.0 wt.%, most preferably 85±6.0 wt.%, in particular 85±4.0 wt.%, The content of the water-insoluble polymer is 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.%, especially 15±4.0 wt.%.

[0210] Preferably, layer (A) and / or layer (C) and / or layer (E) and / or layer (G) each independently have a layer thickness in the range of 0.5 to 100 μm, preferably 0.5 to 25 μm.

[0211] Preferably, 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 μm, more preferably at least 2.0 μm, even more preferably at least 3.0 μm, most preferably at least 4.0 μm, especially at least 5.0 μm.

[0212] Preferably, layer (A) and / or layer (C) and / or layer (E) and / or layer (G) each independently have a layer thickness of at most 22 μm, more preferably at most 19 μm, even more preferably at most 16 μm, most preferably at most 13 μm, in particular at most 10 μm.

[0213] In a preferred embodiment, the adhesion promoting layer (B) and / or the adhesion promoting layer (D) and / or the adhesion promoting layer (F) and / or the adhesion promoting layer (H) each independently comprise a mixture of a water-insoluble polymer and a water-soluble polymer.

[0214] Preferably, the water insoluble polymers are independently selected from anhydride modified polyolefins and acid modified polyolefins.

[0215] Preferably, the water-soluble polymer is selected from polymers or copolymers of vinyl acetate, vinylpyrrolidone, ethylene oxide, acrylamide, and lactic acid, preferably a polymer or copolymer of vinyl acetate.

[0216] Preferably, the water-soluble polymers are 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), and preferably butenediol-vinyl alcohol copolymer (BVOH).

[0217] The water-soluble polymer preferably 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 especially preferably is substantially free of ethylene groups.

[0218] Preferably, 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 %, especially at most 2.5 mol %.

[0219] The water-soluble polymer preferably has a vinyl alcohol group content in the range of 40 to 85 mol %, more preferably 50 to 75 mol %.

[0220] The water-soluble polymer preferably has a butylene group content in the range of 15 to 60 mol %, more preferably 25 to 50 mol %.

[0221] Preferably, the content of the water-soluble polymer is greater than the content of the water-insoluble polymer.

[0222] Preferably, the relative weight ratio of water-soluble polymer to water-insoluble polymer is from 10:1 to 1:10, preferably from 8:1 to 1:8, more preferably from 6:1 to 1:6, even more preferably from 4:1 to 1:4, most preferably from 3:1 to 1:3, especially from 2:1 to 1:2.

[0223] Preferably, the relative weight ratio of water-soluble polymer to water-insoluble polymer is from 11:1 to 1:2, preferably from 10:1 to 1:1, more preferably from 9:1 to 2:1, even more preferably from 8:1 to 3:1, most preferably from 7:1 to 4:1, especially from 6:1 to 5:1.

[0224] In a preferred embodiment, each based on the weight of the adhesion promoting layer (B), (D), (F) or (H), independently of one another: the content of water-soluble polymer is in the range of 85±14 wt.%, preferably 85±12 wt.%, more preferably 85±10 wt.%, even more preferably 85±8.0 wt.%, most preferably 85±6.0 wt.%, in particular 85±4.0 wt.%, The content of the water-insoluble polymer is 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.%, especially 15±4.0 wt.%.

[0225] Preferably, the adhesion-promoting layer (B) and / or the adhesion-promoting layer (D) and / or the adhesion-promoting layer (F) and / or the adhesion-promoting layer (H) each independently have a layer thickness in the range of 0.5 to 25 μm, preferably 0.5 to 10 μm.

[0226] Preferably, the adhesion promoting layer (B) and / or the adhesion promoting layer (D) and / or the adhesion promoting layer (F) and / or the adhesion promoting layer (H) each independently have a layer thickness of at least 1.0 μm, more preferably at least 2.0 μm, even more preferably at least 3.0 μm, most preferably at least 4.0 μm, in particular at least 5.0 μm.

[0227] Preferably, the adhesion promoting layer (B) and / or the adhesion promoting layer (D) and / or the adhesion promoting layer (F) and / or the adhesion promoting layer (H) each independently have a layer thickness of at most 9.0 μm, more preferably at most 8.0 μm, even more preferably at most 7.0 μm, most preferably at most 6.0 μm, in particular at most 5.0 μm.

[0228] Preferably, layer (B) is disposed between layer (A) and layer (C), and is preferably in direct contact with layer (A) and / or layer (C).

[0229] Preferably, layer (C) is disposed between layer (B) and layer (D), and is preferably in direct contact with layer (B) and / or layer (D).

[0230] Preferably, layer (D) is disposed between layer (C) and layer (E), and is preferably in direct contact with layer (C) and / or layer (E).

[0231] Preferably, layer (E) is disposed between layer (D) and layer (F), and is preferably in direct contact with layer (D) and / or layer (F).

[0232] Preferably, layer (F) is disposed between layer (E) and layer (G), and is preferably in direct contact with layer (E) and / or layer (G).

[0233] Preferably, layer (G) is disposed between layer (F) and layer (H), and is preferably in direct contact with layer (F) and / or layer (H).

[0234] In a preferred embodiment, the plastic film according to the present invention has the following structure: a first surface coating; an adhesion-promoting layer (B) forming the first outer layer of the carrier film, which adhesion-promoting layer (B) is preferably based on a water-soluble polymer present in admixture with an adhesion promoter; a layer (C) comprising or based on a water-insoluble polymer, preferably polypropylene, an adhesion-promoting layer (D) based on a water-soluble polymer, preferably butenediol-vinyl alcohol copolymer (BVOH) and / or polyvinyl alcohol (PVOH), preferably present in admixture with an adhesion promoter; a layer (E) comprising or based on a water-insoluble polymer, preferably polypropylene, an adhesion-promoting layer (F) based on a water-soluble polymer, preferably butenediol-vinyl alcohol copolymer (BVOH) and / or polyvinyl alcohol (PVOH), preferably present in admixture with an adhesion promoter; a layer (G) comprising or based on a water-insoluble polymer, preferably polypropylene, an adhesion-promoting layer (H) based on a water-soluble polymer, preferably butenediol-vinyl alcohol copolymer (BVOH) and / or polyvinyl alcohol (PVOH), preferably present in admixture with an adhesion promoter; Second surface coating.

[0235] In a preferred embodiment, the first surface coating comprises a mixture of polysiloxane and a water-soluble polymer, preferably butenediol-vinyl alcohol copolymer (BVOH) and / or polyvinyl alcohol (PVOH).

[0236] Preferably, the polysiloxane is selected from the group consisting of addition-crosslinkable, preferably metal-catalyzed addition-crosslinkable, condensation-crosslinkable, radical-crosslinkable and / or cation-crosslinkable polysiloxanes.

[0237] Preferably, the polysiloxane is selected from the group consisting of polydialkylsiloxanes, preferably polydimethylsiloxanes, and polyalkylarylsiloxanes, preferably polymethylphenylsiloxanes.

[0238] Preferably, 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), and is preferably butenediol-vinyl alcohol copolymer (BVOH).

[0239] Preferably, the relative weight ratio of water-soluble polymer to polysiloxane is from 10:1 to 1:10, preferably from 8:1 to 1:8, more preferably from 6:1 to 1:6, even more preferably from 4:1 to 1:4, most preferably from 3:1 to 1:3, especially from 2:1 to 1:2.

[0240] In a preferred embodiment, the total content of water-soluble polymers 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. %, based on the total weight of the plastic film.

[0241] In a preferred embodiment, the total content of water-soluble polymers 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.-%, in particular at most 10 wt.-%, based on the total weight of the plastic film.

[0242] In a preferred embodiment, the total content of water-soluble polymers 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. %, in particular at most 6.0 wt. %, based on the total weight of the plastic film.

[0243] All layers of the carrier film of the present invention may contain conventional additives in conventional amounts. Typical additives are selected from the group consisting of fillers such as CaCO3, layered silicates such as talc, plasticizers, lubricants, emulsifiers, pigments, rheological additives, catalysts, flow control agents, impact modifiers, optical brighteners, light stabilizers, antioxidants, clarifying agents such as substituted or unsubstituted bisbenzylidene sorbitol, flame retardants, antistatic agents, UV absorbers such as benzoxazinones, blowing agents, and thiosynergists such as thiodipropionic acid dilauryl ester and thiodipropionic acid distearyl ester. The preferred plasticizer for water-soluble polymers is glycerin.

[0244] The carrier layer of the present invention can be manufactured by conventional methods known to those skilled in the art, including providing a first surface coating on the first outer surface, with preferred methods including blown film extrusion and casting.

[0245] These 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 conditioning, such as corona treatment, well known to those skilled in the art, may be necessary to ensure a good bond.

[0246] The plastic film of the present invention can be subjected to conventional recycling processes, typically involving treatment in a water bath. The inventive structure of the plastic film now allows for (almost) complete dissolution of the water-soluble layer and water-soluble polymer during the recycling process without leaving any residue. As a result, the first and second surface coatings (silicone, adhesive, etc.) lose their adhesion to the substrate and are washed away. The substrate can then be separated from the wash water, primarily by density gradient, for example. The detached surface coating is considered a contaminant and can be removed or otherwise treated. The resulting aqueous waste, including the water-soluble polymer, can be easily disposed of if biodegradable and environmentally harmless materials are used, without adversely affecting the sustainability of the novel film design.

[0247] Another aspect of the present invention relates to a method for producing the plastic film according to the present invention described above by blown film coextrusion.

[0248] In the process according to the invention, the extrusion of the plastic film is preferably carried out in one step.

[0249] Another aspect of the present invention relates to a plastic film obtainable by the above process of the present invention.

[0250] Another aspect of the present invention relates to the use of the above-mentioned plastic film according to the present invention, some of whose components are recycled. Preferably, the plastic film is split along at least one layer comprising or based on a water-soluble polymer, preferably butenediol-vinyl alcohol copolymer (BVOH) and / or polyvinyl alcohol (PVOH), after or during treatment in a water bath, optionally at elevated temperature and after a certain exposure time.

[0251] The operation of the present invention will be explained briefly with reference to FIGS.

[0252] FIG. 1 shows a schematic cross section of a plastic film according to the invention having a first surface coating (1), a layer (2) based on a water-soluble polymer, e.g., BVOH / PVOH, a layer (3) based on an adhesion promoter, e.g., PP+MAH, and a layer (4) based on a water-insoluble polymer, e.g., PA.

[0253] Figure 2 shows the treatment of the plastic film shown in Figure 1 in a container (5) filled with warm water (6). The water-soluble polymer dissolves in the water (6), dissolving the water-soluble polymer-based layer (2). As a result, the first surface coating (1) peels off and floats to the surface of the water, where it can be disposed of or recycled separately. The separated composite consisting of the adhesion promoter-based layer (3) and the water-insoluble polymer-based layer (4) can then be recycled.

[0254] The following examples further illustrate the present invention but should not be construed as limiting. [Example]

[0255] Example 1: The multilayer carrier film was produced by blown film coextrusion and then coated on one side with a cured polysiloxane coating for release effect, with the individual layers immediately adjacent to each other in the order shown in the table below.

[0256] [Table 1]

[0257] Example 2: The multilayer carrier film was produced by blown film coextrusion and then coated on one side with a cured polysiloxane coating for release effect, with the individual layers immediately adjacent to each other in the order shown in the table below. [Table 2]

[0258] Example 3: A multilayer carrier film was produced by blown film coextrusion and then coated on one side with a cured polysiloxane coating for release effect and a pressure-sensitive adhesive for adhesion effect, with the individual layers immediately adjacent to each other in the order shown in the table below. [Table 3]

[0259] Example 4: The multilayer carrier film was produced by blown film coextrusion and then coated on one side with a cured polysiloxane coating for release effect, with the individual layers immediately adjacent to each other in the order shown in the table below. [Table 4]

[0260] Example 5: A multilayer carrier film was produced by blown film coextrusion and then coated on one side with a cured polysiloxane coating for release effect and a pressure-sensitive adhesive for adhesion effect, with the individual layers immediately adjacent to each other in the order shown in the table below. [Table 5] Example 6:

[0261] A multilayer carrier film was produced by blown film coextrusion and then coated on one side with a cured polysiloxane coating for release effect and a pressure-sensitive adhesive for adhesion effect, with the individual layers immediately adjacent to each other in the order shown in the table below. [Table 6] [Brief explanation of the drawings]

[0262] [Figure 1] 1 is a schematic cross-sectional view showing a plastic film according to the present invention. [Figure 2] 2 is a schematic cross-section illustrating the treatment of the plastic film shown in FIG. 1 in a container filled with warm water.

Claims

1. A plastic film having a surface coating on at least one side thereof, a carrier film having a first outer layer and a second outer layer; a first surface coating covering at least a portion of a surface of the first outer layer of the carrier film; optionally a second surface coating optionally covering at least a portion of a surface of the second outer layer of the carrier film; the carrier film comprises at least one layer comprising or based on a water-insoluble polymer, preferably a polyolefin, a polyester, and / or a polyamide, the plastic film comprises a water-soluble polymer, preferably butenediol-vinyl alcohol copolymer (BVOH) and / or polyvinyl alcohol (PVOH), more preferably butenediol-vinyl alcohol copolymer (BVOH); (i) the carrier film comprises at least one layer comprising or based on a water-soluble polymer, and / or (ii) The plastic film as described above, wherein the first surface coating comprises or is based on a water-soluble polymer, preferably butenediol-vinyl alcohol copolymer (BVOH) and / or polyvinyl alcohol (PVOH).

2. The plastic film of claim 1 , wherein the first surface coating has release properties.

3. 3. The plastic film according to claim 1, wherein the first surface coating is based on polysiloxane.

4. 10. A plastic film according to any one of the preceding claims, wherein the first surface coating is based on at least one cured polysiloxane, preferably selected from the group consisting of addition-crosslinkable, preferably metal-catalyzed addition-crosslinkable, condensation-crosslinkable, radical-crosslinkable and / or cation-crosslinkable polysiloxanes.

5. 10. A plastic film according to any one of the preceding claims, wherein the first surface coating is based on at least one cured polysiloxane, preferably selected from the group consisting of polydialkylsiloxanes, preferably polydimethylsiloxanes, and polyalkylarylsiloxanes, preferably polymethylphenylsiloxanes.

6. The plastic film of claim 1 , wherein the first surface coating has adhesive properties.

7. 7. The plastic film of claim 6, wherein the first surface coating is based on a pressure sensitive adhesive.

8. 8. The plastic film of claim 7, wherein 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.

9. 10. The plastic film of claim 1, wherein the first surface coating is based on a printing ink or varnish.

10. The first surface coating comprises: (i) It has peelability and a weight per unit area of ​​up to 5.0 g / m ２ , more preferably up to 4.0 g / m ２ , and even more preferably up to 3.0 g / m ２ , most preferably up to 2.0 g / m ２ , especially up to 1.0 g / m ２ is, or (ii) It has adhesive properties and a weight per unit area of ​​up to 100 g / m ２ , more preferably up to 80 g / m ２ , and even more preferably up to 60 g / m ２ , most preferably up to 40 g / m ２ , especially up to 20 g / m ２ 10. The plastic film of any one of the preceding claims, wherein

11. 10. A plastic film according to any one of the preceding claims, wherein the second surface coating is release-resistant.

12. 10. A plastic film according to any one of the preceding claims, wherein the second surface coating is based on polysiloxane.

13. 10. A plastic film according to any one of the preceding claims, wherein the second surface coating is based on at least one cured polysiloxane, preferably selected from the group consisting of addition-crosslinkable, preferably metal-catalyzed addition-crosslinkable, condensation-crosslinkable, radical-crosslinkable and / or cation-crosslinkable polysiloxanes.

14. 10. A plastic film according to any one of the preceding claims, wherein the second surface coating is based on at least one cured polysiloxane, preferably selected from the group consisting of polydialkylsiloxanes, preferably polydimethylsiloxanes, and polyalkylarylsiloxanes, preferably polymethylphenylsiloxanes.

15. The plastic film according to any one of claims 1 to 10, wherein the second surface coating has adhesive properties.

16. 16. The plastic film of claim 15, wherein the second surface coating is based on a pressure sensitive adhesive.

17. 17. The plastic film of claim 16, wherein 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.

18. A plastic film according to any one of claims 1 to 10, wherein the second surface coating is based on a printing ink or varnish.

19. The second surface coating is (i) It has peelability and a weight per unit area of ​​up to 5.0 g / m ２ , more preferably up to 4.0 g / m ２ , and even more preferably up to 3.0 g / m ２ , most preferably up to 2.0 g / m ２ , especially up to 1.0 g / m ２ is, or (ii) It has adhesive properties and a weight per unit area of ​​up to 100 g / m ２ , more preferably up to 80 g / m ２ , and even more preferably up to 60 g / m ２ , most preferably up to 40 g / m ２ , especially up to 20 g / m ２ 10. The plastic film of any one of the preceding claims, wherein

20. 10. A plastic film according to any one of the preceding claims, wherein the plastic film has a total layer thickness in the range of 10 to 250 μm.

21. 10. A plastic film according to claim 1, wherein the plastic film has a total layer thickness of at least 20 μm, more preferably at least 25 μm, even more preferably at least 30 μm, most preferably at least 35 μm, in particular at least 40 μm.

22. 10. The plastic film according to claim 1, wherein the plastic film has a total layer thickness of at most 90 μm, more preferably at most 80 μm, even more preferably at most 70 μm, most preferably at most 60 μm, in particular at most 50 μm.

23. 10. A plastic film according to claim 1, which is extrudable, preferably in one coextrusion step, preferably by blown film coextrusion.

24. 10. The plastic film according to claim 1, wherein the carrier film has a symmetrical layer structure.

25. The carrier film is (a) a layer (a) based on a water-soluble polymer, preferably butenediol-vinyl alcohol copolymer (BVOH) and / or polyvinyl alcohol (PVOH), forming the first outer layer of the carrier film; (b) an optional adhesion promoting layer (b); (c) a layer (c) based on a water-insoluble polymer, preferably a polyolefin, polyester, and / or polyamide; (d) an optional adhesion promoting layer (d); (e) optionally a layer (e) based on a water-soluble polymer, preferably butenediol-vinyl alcohol copolymer (BVOH) and / or polyvinyl alcohol (PVOH); (f) optionally a layer (f) based on a water-insoluble polymer, preferably a polyolefin, polyester, and / or polyamide; 10. The plastic film according to claim 1, optionally comprising a layer (g) based on a water-soluble polymer, preferably a butenediol-vinyl alcohol copolymer (BVOH) and / or polyvinyl alcohol (PVOH).

26. 26. Plastic film according to claim 25, wherein said layer (a) is based on an extrudable water-soluble polymer, preferably butenediol-vinyl alcohol copolymer (BVOH) and / or polyvinyl alcohol (PVOH).

27. The layer (a) is (i) a completely synthetic water-soluble polymer; 27. The plastic film of claim 25 or 26, based on one or more water-soluble polymers independently selected from (ii) semi-synthetic or natural water-soluble polymers.

28. 28. The plastic film according to any one of claims 25 to 27, wherein 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 a polymer or copolymer of vinyl acetate.

29. 29. The plastic film according to any one of claims 25 to 28, wherein 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).

30. 30. The plastic film according to any one of claims 25 to 29, wherein 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%, in particular substantially no ethylene groups.

31. 31. The plastic film according to any one of claims 25 to 30, wherein layer (a) comprises at least 50 wt.-%, more preferably at least 60 wt.-%, even more preferably at least 70 wt.-%, most preferably at least 80 wt.-%, especially at least 90 wt.-%, of water-soluble polymer, based on the total weight of layer (a).

32. 32. The plastic film according to any one of claims 25 to 31, wherein layer (a) comprises at most 10 wt.-%, more preferably 5 wt.-%, even more preferably at most 2.5 wt.-%, and most preferably at most 1.0 wt.-%, of a water-insoluble polymer, relative to the total weight of layer (a), in particular being substantially free of any water-insoluble polymer.

33. 33. The plastic film according to any one of claims 25 to 32, wherein the layer (a) has a layer thickness in the range of 0.5 to 100 μm, preferably 0.5 to 25 μm.

34. 34. The plastic film according to any one of claims 25 to 33, wherein the layer (a) has a layer thickness of at least 1.0 μm, more preferably at least 2.0 μm, even more preferably at least 3.0 μm, most preferably at least 4.0 μm, in particular at least 5.0 μm.

35. 35. The plastic film according to any one of claims 25 to 34, wherein the layer (a) has a layer thickness of at most 22 μm, more preferably at most 19 μm, even more preferably at most 16 μm, most preferably at most 13 μm, in particular at most 10 μm.

36. 36. The plastic film according to any one of claims 25 to 35, wherein the layer (a) has a layer thickness of at most 9.0 μm, more preferably at most 8.0 μm, even more preferably at most 7.0 μm, most preferably at most 6.0 μm, in particular at most 5.0 μm.

37. 37. The plastic film according to any one of claims 25 to 36, wherein the layer (a) has a layer thickness of at most 4.0 μm, more preferably at most 3.0 μm, even more preferably at most 2.5 μm, most preferably at most 2.0 μm, in particular at most 1.75 μm.

38. 38. Plastic film according to any one of claims 25 to 37, wherein the adhesion-promoting layer (b) is based on an anhydride- or acid-modified polyolefin.

39. 39. The plastic film of claim 38, wherein in addition to the anhydride- or acid-modified polyolefin, the adhesion-promoting layer (b) comprises a further polymer, preferably the same water-soluble polymer as in layer (a) and / or the same water-insoluble polymer as in layer (c).

40. 40. A plastic film according to any one of claims 25 to 39, wherein the adhesion promoting layer (b) comprises at least 30% by weight, more preferably at least 40% by weight, even more preferably at least 50% by weight, most preferably at least 60% by weight, especially at least 70% by weight of water-soluble polymer, based on the total weight of layer (b).

41. 41. The plastic film according to any one of claims 25 to 40, wherein the adhesion-promoting layer (b) has a layer thickness in the range of 0.5 to 25 μm, preferably 0.5 to 10 μm.

42. 42. The plastic film according to any one of claims 25 to 41, wherein the adhesion-promoting layer (b) has a layer thickness of at least 1.0 μm, more preferably at least 2.0 μm, even more preferably at least 3.0 μm, most preferably at least 4.0 μm, in particular at least 5.0 μm.

43. 43. The plastic film according to any one of claims 25 to 42, wherein the adhesion-promoting layer (b) has a layer thickness of at most 9.0 μm, more preferably at most 8.0 μm, even more preferably at most 7.0 μm, most preferably at most 6.0 μm, in particular at most 5.0 μm.

44. 44. The plastic film according to any one of claims 25 to 43, wherein the layer (c) is based on one or more water-insoluble polymers independently selected from the group consisting of polyolefins, polyesters, and polyamides.

45. The layer (c) is thermoplastic olefin homopolymers, and / or 45. The plastic film of any one of claims 25 to 44, based on one or more water-insoluble polymers independently selected from the group consisting of: thermoplastic olefin copolymers of α,β-unsaturated olefins having 2 to 10 carbon atoms.

46. 46. ​​The plastic film according to any one of claims 25 to 45, wherein the layer (c) is based on one or more water-insoluble polymers independently selected from the group consisting of polyethylene, polypropylene, polybutylene, polyisobutylene (PI), copolymers and / or mixtures of at least two of these polymers.

47. 47. The plastic film according to any one of claims 25 to 46, wherein the layer (c) comprises at least 50 wt.%, more preferably at least 60 wt.%, even more preferably at least 70 wt.%, most preferably at least 80 wt.%, especially at least 90 wt.%, of a water-insoluble polymer, based on the total weight of the layer (c).

48. 48. The plastic film according to any one of claims 25 to 47, wherein layer (c) comprises at most 10 wt.-%, more preferably 5 wt.-%, even more preferably at most 2.5 wt.-%, and most preferably at most 1.0 wt.-%, of a water-soluble polymer, relative to the total weight of layer (a), in particular being substantially free of any water-soluble polymer.

49. 49. The plastic film according to any one of claims 25 to 48, wherein the layer (c) has a layer thickness in the range of 0.5 to 100 μm, preferably 0.5 to 25 μm.

50. 50. The plastic film according to any one of claims 25 to 49, wherein the layer (c) has a layer thickness of at least 1.0 μm, more preferably at least 2.0 μm, even more preferably at least 3.0 μm, most preferably at least 4.0 μm, in particular at least 5.0 μm.

51. 51. The plastic film according to any one of claims 25 to 50, wherein the layer (c) has a layer thickness of at most 22 μm, more preferably at most 19 μm, even more preferably at most 16 μm, most preferably at most 13 μm, in particular at most 10 μm.

52. 52. Plastic film according to any one of claims 25 to 51, wherein the adhesion-promoting layer (d) is based on an anhydride- or acid-modified polyolefin.

53. 53. The plastic film of claim 52, wherein in addition to the anhydride- or acid-modified polyolefin, the adhesion-promoting layer (d) comprises a further polymer, preferably the same water-soluble polymer as in layer (e) and / or the same water-insoluble polymer as in layer (c).

54. 54. A plastic film according to any one of claims 25 to 53, wherein the adhesion promoting layer (d) comprises at least 30% by weight, more preferably at least 40% by weight, even more preferably at least 50% by weight, most preferably at least 60% by weight, in particular at least 70% by weight, of a water-insoluble polymer, based on the total weight of layer (d).

55. 55. A plastic film according to any one of claims 25 to 54, wherein the adhesion-promoting layer (d) has a layer thickness in the range of 0.5 to 25 μm, preferably 0.5 to 10 μm.

56. 56. The plastic film according to any one of claims 25 to 55, wherein the adhesion-promoting layer (d) has a layer thickness of at least 1.0 μm, more preferably at least 2.0 μm, even more preferably at least 3.0 μm, most preferably at least 4.0 μm, in particular at least 5.0 μm.

57. 57. The plastic film according to any one of claims 25 to 56, wherein the adhesion-promoting layer (d) has a layer thickness of at most 9.0 μm, more preferably at most 8.0 μm, even more preferably at most 7.0 μm, most preferably at most 6.0 μm, in particular at most 5.0 μm.

58. The plastic film according to any one of claims 25 to 57, wherein the adhesion promoter layer (d) has the same layer structure as the adhesion promoter layer (b).

59. The plastic film according to any one of claims 25 to 58, wherein the adhesion promoting layer (d) has a layer structure different from that of the adhesion promoter layer (b).

60. 60. Plastic film according to any one of claims 25 to 59, wherein said layer (e) is based on an extrudable water-soluble polymer, preferably butenediol-vinyl alcohol copolymer (BVOH) and / or polyvinyl alcohol (PVOH).

61. The layer (e) is (i) a completely synthetic water-soluble polymer, and (ii) a semi-synthetic or natural water-soluble polymer;

62. 62. The plastic film according to any one of claims 25 to 61, wherein 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 a polymer or copolymer of vinyl acetate.

63. 63. The plastic film of any one of claims 25 to 62, wherein 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).

64. 64. The plastic film according to any one of claims 25 to 63, wherein 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%, in particular substantially no ethylene groups.

65. 65. The plastic film according to any one of claims 25 to 64, wherein the layer (e) comprises at least 50 wt.%, more preferably at least 60 wt.%, even more preferably at least 70 wt.%, most preferably at least 80 wt.%, especially at least 90 wt.%, of water-soluble polymer, based on the total weight of the layer (e).

66. 66. The plastic film according to any one of claims 25 to 65, wherein layer (e) comprises at most 10 wt.-%, more preferably 5 wt.-%, even more preferably at most 2.5 wt.-%, and most preferably at most 1.0 wt.-%, of a water-insoluble polymer, relative to the total weight of layer (e), in particular being substantially free of any water-insoluble polymer.

67. 67. A plastic film according to any one of claims 25 to 66, wherein the layer (e) has a layer thickness in the range of 0.5 to 100 μm, preferably 0.5 to 25 μm.

68. 68. The plastic film according to any one of claims 25 to 67, wherein the layer (e) has a layer thickness of at least 1.0 μm, more preferably at least 2.0 μm, even more preferably at least 3.0 μm, most preferably at least 4.0 μm, in particular at least 5.0 μm.

69. 69. The plastic film according to any one of claims 25 to 68, wherein the layer (e) has a layer thickness of at most 22 μm, more preferably at most 19 μm, even more preferably at most 16 μm, most preferably at most 13 μm, in particular at most 10 μm.

70. 70. The plastic film according to any one of claims 25 to 69, wherein the layer (e) has a layer thickness of at most 9.0 μm, more preferably at most 8.0 μm, even more preferably at most 7.0 μm, most preferably at most 6.0 μm, in particular at most 5.0 μm.

71. 71. The plastic film according to any one of claims 25 to 70, wherein the layer (e) has a layer thickness of at most 4.0 μm, more preferably at most 3.0 μm, even more preferably at most 2.5 μm, most preferably at most 2.0 μm, in particular at most 1.75 μm.

72. The plastic film according to any one of claims 25 to 71, wherein the layer (e) has the same layer structure as the layer (a).

73. The plastic film according to any one of claims 25 to 72, wherein the layer (e) has a layer structure different from that of the layer (a).

74. 74. The plastic film of any one of claims 25 to 73, wherein the layer (f) is based on one or more water-insoluble polymers independently selected from the group consisting of polyolefins, polyesters, and polyamides.

75. The layer (f) is thermoplastic olefin homopolymers, and / or 75. The plastic film of any one of claims 25 to 74, based on one or more water-insoluble polymers independently selected from the group consisting of: thermoplastic olefin copolymers of α,β-unsaturated olefins having 2 to 10 carbon atoms.

76. 76. The plastic film according to any one of claims 25 to 75, wherein the layer (f) is based on one or more water-insoluble polymers independently selected from the group consisting of polyethylene, polypropylene, polybutylene, polyisobutylene (PI), copolymers and / or mixtures of at least two of these polymers.

77. 77. The plastic film according to any one of claims 25 to 76, wherein the layer (f) comprises at least 50 wt.-%, more preferably at least 60 wt.-%, even more preferably at least 70 wt.-%, most preferably at least 80 wt.-%, and in particular at least 90 wt.-%, of a water-insoluble polymer, based on the total weight of the layer (f).

78. 78. The plastic film according to any one of claims 25 to 77, wherein layer (f) comprises at most 10 wt.-%, more preferably 5 wt.-%, even more preferably at most 2.5 wt.-%, and most preferably at most 1.0 wt.-% of a water-soluble polymer, relative to the total weight of layer (f), in particular being substantially free of any water-soluble polymer.

79. 79. A plastic film according to any one of claims 25 to 78, wherein the layer (f) has a layer thickness in the range of 0.5 to 100 μm, preferably 0.5 to 25 μm.

80. 80. The plastic film according to any one of claims 25 to 79, wherein the layer (f) has a layer thickness of at least 1.0 μm, more preferably at least 2.0 μm, even more preferably at least 3.0 μm, most preferably at least 4.0 μm, in particular at least 5.0 μm.

81. 81. The plastic film according to any one of claims 25 to 80, wherein the layer (f) has a layer thickness of at most 22 μm, more preferably at most 19 μm, even more preferably at most 16 μm, most preferably at most 13 μm, in particular at most 10 μm.

82. The plastic film according to any one of claims 25 to 81, wherein the layer (f) has the same layer structure as the layer (c).

83. The plastic film according to any one of claims 25 to 82, wherein the layer (f) has a layer structure different from that of the layer (c).

84. 84. Plastic film according to any one of claims 25 to 83, wherein said layer (g) is based on an extrudable water-soluble polymer, preferably butenediol-vinyl alcohol copolymer (BVOH) and / or polyvinyl alcohol (PVOH).

85. The layer (g) is (i) a completely synthetic water-soluble polymer, and (ii) a semi-synthetic or natural water-soluble polymer;

86. 86. The plastic film according to any one of claims 25 to 85, wherein 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 a polymer or copolymer of vinyl acetate.

87. 87. The plastic film of any one of claims 25 to 86, wherein 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).

88. 88. The plastic film according to any one of claims 25 to 87, wherein 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%, in particular substantially no ethylene groups.

89. 89. The plastic film according to any one of claims 25 to 88, wherein the layer (g) comprises at least 50 wt.%, more preferably at least 60 wt.%, even more preferably at least 70 wt.%, most preferably at least 80 wt.%, especially at least 90 wt.%, of water-soluble polymer, based on the total weight of the layer (g).

90. 90. The plastic film according to any one of claims 25 to 89, wherein layer (g) comprises at most 10 wt.-%, more preferably 5 wt.-%, even more preferably at most 2.5 wt.-%, and most preferably at most 1.0 wt.-% of a water-insoluble polymer, relative to the total weight of layer (g), in particular being substantially free of any water-insoluble polymer.

91. 91. The plastic film according to any one of claims 25 to 90, wherein the layer (g) has a layer thickness in the range of 0.5 to 100 μm, preferably 0.5 to 25 μm.

92. 92. The plastic film according to any one of claims 25 to 91, wherein the layer (g) has a layer thickness of at least 1.0 μm, more preferably at least 2.0 μm, even more preferably at least 3.0 μm, most preferably at least 4.0 μm, in particular at least 5.0 μm.

93. 93. The plastic film according to any one of claims 25 to 92, wherein the layer (g) has a layer thickness of at most 22 μm, more preferably at most 19 μm, even more preferably at most 16 μm, most preferably at most 13 μm, in particular at most 10 μm.

94. 94. The plastic film according to any one of claims 25 to 93, wherein the layer (g) has a layer thickness of at most 9.0 μm, more preferably at most 8.0 μm, even more preferably at most 7.0 μm, most preferably at most 6.0 μm, in particular at most 5.0 μm.

95. 95. The plastic film according to any one of claims 25 to 94, wherein the layer (g) has a layer thickness of at most 4.0 μm, more preferably at most 3.0 μm, even more preferably at most 2.5 μm, most preferably at most 2.0 μm, in particular at most 1.75 μm.

96. The plastic film according to any one of claims 25 to 95, wherein the layer (g) has the same layer structure as the layer (e).

97. The plastic film according to any one of claims 25 to 96, wherein the layer (g) has a layer structure different from that of the layer (e).

98. The carrier film is (i)(a)-(c), (ii) (a)-(b)-(c), (a)-(c)-(d), (a)-(c)-(e), (a)-(c)-(f), (a)-(c)-(g), (iii) (a)-(b)-(c)-(d), (a)-(b)-(c)-(e), (a)-(b)-(c)-(f), (a)-(b)-(c)-(g), (a)-( c) - (d) - (e), (a) - (c) - (d) - (f), (a) - (c) - (d) - (g), (a) - (c) - (e) - (f), (a) - (c) - (e) - (g), (iv) (a) - (b) - (c) - (d) - (e), (a) - (b) - (c) - (d) - (f), (a) - (b) - (c) - (d) - (g), (a) - (b) - (c) - (e) - (f ), (a) - (b) - (c) - (e) - (g), (a) - (c) - (d) - (e) - (f), (a) - (c) - (d) - (e) - (g), (a) - (c) - (e) - (f) - (g), (v) (a)-(b)-(c)-(d)-(e)-(f), (a)-(b)-(c)-(d)-(e)-(g), and (vi) (a)-(b)-(c)-(d)-(e)-(f)-(g). The plastic film according to any one of claims 25 to 97, having a layer structure selected from the group consisting of:

99. The plastic film is a film coated with a "release agent," which refers to a release surface coating. (i) release agents—(a)-(c); (ii) release agent-(a)-(b)-(c), release agent-(a)-(c)-(d), release agent-(a)-(c)-(e), release agent-(a)-(c)-(f), release agent-(a)-(c)-(g), (iii) release agent-(a)-(b)-(c)-(d), release agent-(a)-(b)-(c)-(e), release agent-(a)-(b)-(c)-(f), release agent-(a)-(b)-(c)-(g), release agent-(a)-(c)-(d)-(e), release agent-(a)-(c)-(d)-(f), release agent-(a)-(c)-(d)-(g), release agent-(a)-(c)-(e)-(f), release agent-(a)-(c)-(e)-(g), (iv) release agent-(a)-(b)-(c)-(d)-(e), release agent-(a)-(b)-(c)-(d)-(f), release agent-(a)-(b)-(c)-(d)-(g), release agent-(a)-(b)-(c)-(e)-(f), release agent-(a)-(b)-(c)-(e)-(g), release agent-(a)-(c)-(d)-(e)-(f), release agent-(a)-(c)-(d)-(e)-(g), release agent-(a)-(c)-(e)-(f)-(g), (v) release agents-(a)-(b)-(c)-(d)-(e)-(f), release agents-(a)-(b)-(c)-(d)-(e)-(g), and (vi) Release agent - (a) - (b) - (c) - (d) - (e) - (f) - (g) A plastic film according to any one of claims 25 to 98, having a layer structure selected from the group consisting of:

100. The plastic film is a film coated with a "release agent," which refers to a release surface coating. (i) release agent—(a)-(c)—release agent; (ii) release agent-(a)-(b)-(c)-release agent, release agent-(a)-(c)-(d)-release agent, release agent-(a)-(c)-(e)-release agent, release agent-(a)-(c)-(f)-release agent, release agent-(a)-(c)-(g)-release agent, (iii) release agent-(a)-(b)-(c)-(d)-release agent, release agent-(a)-(b)-(c)-(e)-release agent, release agent-(a)-(b)-(c)-(f)-release agent, release agent-(a)-(b)-(c)-(g)-release agent, release agent-(a)-(c)-(d)-(e)-release agent, release agent-(a)-(c)-(d)-(f)-release agent, release agent-(a)-(c)-(d)-(g)-release agent, release agent-(a)-(c)-(e)-(f)-release agent, release agent-(a)-(c)-(e)-(g)-release agent, (iv) release agent-(a)-(b)-(c)-(d)-(e)-release agent, release agent-(a)-(b)-(c)-(d)-(f)-release agent, release agent-(a)-(b)-(c)-(d)-(g)-release agent, release agent-(a)-(b)-(c)-(e)-(f)-release agent, release agent-(a)-(b)-(c)-(e)-(g)-release agent, release agent-(a)-(c)-(d)-(e)-(f)-release agent, release agent-(a)-(c)-(d)-(e)-(g)-release agent, release agent-(a)-(c)-(e)-(f)-(g)-release agent, (v) release agent-(a)-(b)-(c)-(d)-(e)-(f)-release agent, release agent-(a)-(b)-(c)-(d)-(e)-(g)-release agent, and (vi) release agent-(a)-(b)-(c)-(d)-(e)-(f)-(g)-release agent. A plastic film according to any one of claims 25 to 99, having a layer structure selected from the group consisting of:

101. The plastic film is a film having a release agent and an adhesive agent, wherein "release agent" refers to a release surface coating and "adhesive" refers to an adhesive surface coating. (i) release agent-(a)-(c)-adhesive; (ii) release agent-(a)-(b)-(c)-adhesive, release agent-(a)-(c)-(d)-adhesive, release agent-(a)-(c)-(e)-adhesive, release agent-(a)-(c)-(f)-adhesive, release agent-(a)-(c)-(g)-release agent, (iii) release agent-(a)-(b)-(c)-(d)-adhesive, release agent-(a)-(b)-(c)-(e)-adhesive, release agent-(a)-(b)-(c)-(f)-adhesive, release agent-(a)-(b)-(c)-(g)-adhesive, release agent-(a)-(c)-(d)-(e)-adhesive, release agent-(a)-(c)-(d)-(f)-adhesive, release agent-(a)-(c)-(d)-(g)-adhesive, release agent-(a)-(c)-(e)-(f)-adhesive, release agent-(a)-(c)-(e)-(g)-adhesive, (iv) release agent-(a)-(b)-(c)-(d)-(e)-adhesive, release agent-(a)-(b)-(c)-(d)-(f)-adhesive, release agent-(a)-(b)-(c)-(d)-(g)-adhesive, release agent-(a)-(b)-(c)-(e)-(f)-adhesive, release agent-(a)-(b)-(c)-(e)-(g)-adhesive, release agent-(a)-(c)-(d)-(e)-(f)-adhesive, release agent-(a)-(c)-(d)-(e)-(g)-adhesive, release agent-(a)-(c)-(e)-(f)-(g)-adhesive, (v) release agent-(a)-(b)-(c)-(d)-(e)-(f)-adhesive, release agent-(a)-(b)-(c)-(d)-(e)-(g)-adhesive, and (vi) a release agent - (a) - (b) - (c) - (d) - (e) - (f) - (g) - adhesive. The plastic film according to any one of claims 25 to 100, having a layer structure selected from the group consisting of:

102. The plastic film is a film having a release agent and an adhesive agent, wherein "release agent" refers to a release surface coating and "adhesive" refers to an adhesive surface coating. (i) adhesive-(a)-(c)-release agent; (ii) adhesive-(a)-(b)-(c)-release agent, adhesive-(a)-(c)-(d)-release agent, adhesive-(a)-(c)-(e)-release agent, adhesive-(a)-(c)-(f)-release agent, adhesive-(a)-(c)-(g)-release agent, (iii) adhesive-(a)-(b)-(c)-(d)-release agent, adhesive-(a)-(b)-(c)-(e)-release agent, adhesive-(a)-(b)-(c)-(f)-release agent, adhesive-(a)-(b)-(c)-(g)-release agent, adhesive-(a)-(c)-(d)-(e)-release agent, adhesive-(a)-(c)-(d)-(f)-release agent, adhesive-(a)-(c)-(d)-(g)-release agent, adhesive-(a)-(c)-(e)-(f)-release agent, adhesive-(a)-(c)-(e)-(g)-release agent, (iv) adhesive-(a)-(b)-(c)-(d)-(e)-release agent, adhesive-(a)-(b)-(c)-(d)-(f)-release agent, adhesive-(a)-(b)-(c)-(d)-(g)-release agent, adhesive-(a)-(b)-(c)-(e)-(f)-release agent, adhesive-(a)-(b)-(c)-(e)-(g)-release agent, adhesive-(a)-(c)-(d)-(e)-(f)-release agent, adhesive-(a)-(c)-(d)-(e)-(g)-release agent, adhesive-(a)-(c)-(e)-(f)-(g)-release agent, (v) adhesive-(a)-(b)-(c)-(d)-(e)-(f)-release agent, adhesive-(a)-(b)-(c)-(d)-(e)-(g)-release agent, and (vi) adhesive-(a)-(b)-(c)-(d)-(e)-(f)-(g)-release agent. The plastic film according to any one of claims 25 to 101, having a layer structure selected from the group consisting of:

103. The carrier film is (A) optionally a layer (A) comprising or based on a water-insoluble polymer, preferably a polyolefin, a polyester, and / or a polyamide; (B) an optional adhesion promoting layer (B); (C) optionally a layer (C) comprising or based on a water-insoluble polymer, preferably a polyolefin, polyester, and / or polyamide; (D) an optional adhesion promoting layer (D); (E) optionally a layer (E) comprising or based on a water-insoluble polymer, preferably a polyolefin, polyester, and / or polyamide; (F) an optional adhesion promoting layer (F); (G) optionally a layer (G) comprising or based on a water-insoluble polymer, preferably a polyolefin, polyester, and / or polyamide; (H) optionally an adhesion promoting layer (H), 25. The plastic film of claim 1, wherein either the layer (A) or the adhesion-promoting layer (B) forms the first outer layer of the carrier film.

104. The plastic film of claim 103, wherein the layer (A) and / or the layer (C) and / or the layer (E) and / or the layer (G) each independently comprise a mixture of a water-insoluble polymer, preferably a polyolefin, a polyester, and / or a polyamide, and a water-soluble polymer, preferably a butenediol-vinyl alcohol copolymer (BVOH) and / or a polyvinyl alcohol (PVOH).

105. 105. The plastic film of claim 104, wherein the water-insoluble polymer is independently selected from the group consisting of polyolefins, polyesters, and polyamides.

106. 106. A plastic film according to claim 104 or 105, wherein the water-soluble polymer is selected from polymers or copolymers of vinyl acetate, vinylpyrrolidone, ethylene oxide, acrylamide, and lactic acid, preferably a polymer or copolymer of vinyl acetate.

107. The plastic film according to claims 104 to 106, wherein 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), and is preferably butenediol-vinyl alcohol copolymer (BVOH).

108. The plastic film according to claims 104 to 106, wherein 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%, in particular substantially no ethylene groups.

109. 109. A plastic film according to any one of claims 104 to 108, wherein the relative weight ratio of water soluble polymer to water insoluble polymer is from 10:1 to 1:10, preferably from 8:1 to 1:8, more preferably from 6:1 to 1:6, even more preferably from 4:1 to 1:4, most preferably from 3:1 to 1:3, especially from 2:1 to 1:

2.

110. The plastic film according to any one of claims 103 to 109, wherein the layer (A) and / or the layer (C) and / or the layer (E) each independently have a layer thickness in the range of 0.5 to 100 µm, preferably 0.5 to 25 µm.

111. The plastic film according to any one of claims 103 to 110, wherein the layer (A) and / or the layer (C) and / or the layer (E) and / or the layer (G) each independently have a layer thickness of at least 1.0 μm, more preferably at least 2.0 μm, even more preferably at least 3.0 μm, most preferably at least 4.0 μm, and in particular at least 5.0 μm.

112. 112. The plastic film according to any one of claims 103 to 111, wherein the layer (A) and / or the layer (C) and / or the layer (E) and / or the layer (G) each independently have a layer thickness of at most 22 μm, more preferably at most 19 μm, even more preferably at most 16 μm, most preferably at most 13 μm, in particular at most 10 μm.

113. The plastic film according to any one of claims 103 to 112, wherein the adhesion promoting layer (B) and / or the adhesion promoting layer (D) and / or the adhesion promoting layer (F) and / or the adhesion promoting layer (H) each independently comprise a mixture of a water-insoluble polymer and a water-soluble polymer.

114. 114. The plastic film of claim 113, wherein the water-insoluble polymer is independently selected from anhydride-modified and acid-modified polyolefins.

115. 115. A plastic film according to claim 113 or 114, wherein the water-soluble polymer is selected from polymers or copolymers of vinyl acetate, vinylpyrrolidone, ethylene oxide, acrylamide and lactic acid, preferably a polymer or copolymer of vinyl acetate.

116. The plastic film according to claims 113 to 115, wherein 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), and is preferably butenediol-vinyl alcohol copolymer (BVOH).

117. The plastic film according to claims 113 to 116, wherein 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%, in particular substantially no ethylene groups.

118. 118. A plastic film according to any one of claims 113 to 117, wherein the relative weight ratio of water soluble polymer to water insoluble polymer is from 10:1 to 1:10, preferably from 8:1 to 1:8, more preferably from 6:1 to 1:6, even more preferably from 4:1 to 1:4, most preferably from 3:1 to 1:3, especially from 2:1 to 1:

2.

119. The plastic film according to any one of claims 113 to 118, wherein the adhesion promoting layer (B) and / or the adhesion promoting layer (D) and / or the adhesion promoting layer (F) and / or the adhesion promoting layer (H) each independently have a layer thickness in the range of 0.5 to 25 μm, preferably 0.5 to 10 μm.

120. 120. A plastic film according to any one of claims 113 to 119, wherein the adhesion promoting layer (B) and / or the adhesion promoting layer (D) and / or the adhesion promoting layer (F) and / or the adhesion promoting layer (H) each independently have a layer thickness of at least 1.0 μm, more preferably at least 2.0 μm, even more preferably at least 3.0 μm, most preferably at least 4.0 μm, in particular at least 5.0 μm.

121. The plastic film according to any one of claims 113 to 120, wherein the adhesion promoting layer (B) and / or the adhesion promoting layer (D) and / or the adhesion promoting layer (F) and / or the adhesion promoting layer (H) each independently have a layer thickness of at most 9.0 μm, more preferably at most 8.0 μm, even more preferably at most 7.0 μm, most preferably at most 6.0 μm, in particular at most 5.0 μm.

122. 122. A plastic film according to any one of claims 103 to 121, wherein the first surface coating comprises a mixture of polysiloxane and a water-soluble polymer, preferably butenediol-vinyl alcohol copolymer (BVOH) and / or polyvinyl alcohol (PVOH).

123. 123. The plastic film of claim 122, wherein the polysiloxane is selected from the group consisting of addition-crosslinkable, preferably metal-catalyzed addition-crosslinkable, condensation-crosslinkable, radical-crosslinkable and / or cation-crosslinkable polysiloxanes.

124. 124. A plastic film according to claim 122 or 123, wherein the polysiloxane is selected from the group consisting of polydialkylsiloxanes, preferably polydimethylsiloxanes, and polyalkylarylsiloxanes, preferably polymethylphenylsiloxanes.

125. The plastic film according to any one of claims 122 to 124, wherein 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), and is preferably butenediol-vinyl alcohol copolymer (BVOH).

126. 127. A plastic film according to any one of claims 122 to 126, wherein the relative weight ratio of water soluble polymer to water insoluble polymer is from 10:1 to 1:10, preferably from 8:1 to 1:8, more preferably from 6:1 to 1:6, even more preferably from 4:1 to 1:4, most preferably from 3:1 to 1:3, especially from 2:1 to 1:

2.

127. 10. A plastic film according to any one of the preceding claims, wherein the total content of water-soluble polymers 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.-%, in particular at least 4.0 wt.-%, based on the total weight of the plastic film.

128. 10. A plastic film according to any one of the preceding claims, wherein the total content of water-soluble polymers 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.-%, in particular at most 10 wt.-%, relative to the total weight of the plastic film.

129. 10. A plastic film according to any one of the preceding claims, wherein the total content of water-soluble polymers 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.-%, in particular at most 6.0 wt.-%, relative to the total weight of the plastic film.

130. 10. A plastic film according to any one of the preceding claims, wherein the carrier film comprises at least one layer comprising or based on a water-soluble polymer, preferably butenediol-vinyl alcohol copolymer (BVOH) and / or polyvinyl alcohol (PVOH), and wherein the plastic film can be split along this layer when treated in a water bath, optionally at elevated temperature and after a certain exposure time.

131. 10. The plastic film according to any one of the preceding claims, wherein the water-soluble polymer has a water solubility of 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, especially at least 25 g / L.

132. 10. The plastic film according to any one of the preceding claims, wherein the water-insoluble polymer has a water solubility of 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, especially at most 10 mg / L.

133. 10. A method for producing a plastic film according to any one of the preceding claims by co-extrusion of a blown film.

134. 134. The method of claim 133, wherein the extrusion of the plastic film is performed in one step.

135. 135. A plastic film obtainable by the method of claim 133 or 134.

136. 133. Use of a plastic film according to any one of claims 1 to 132, in which some of the components are recycled, preferably the plastic film being split along at least one layer comprising or based on a water-soluble polymer, preferably butenediol-vinyl alcohol copolymer (BVOH) and / or polyvinyl alcohol (PVOH), after or during treatment in a water bath, optionally at elevated temperature and after a certain exposure time.

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