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WO2024133242A1 - Film plastique recyclable - Google Patents

Film plastique recyclable Download PDF

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Publication number
WO2024133242A1
WO2024133242A1 PCT/EP2023/086619 EP2023086619W WO2024133242A1 WO 2024133242 A1 WO2024133242 A1 WO 2024133242A1 EP 2023086619 W EP2023086619 W EP 2023086619W WO 2024133242 A1 WO2024133242 A1 WO 2024133242A1
Authority
WO
WIPO (PCT)
Prior art keywords
layer
plastic film
film according
water
soluble polymer
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/EP2023/086619
Other languages
German (de)
English (en)
Inventor
Patrick ALTMANN
Christian Hermann
Kilian STENGL
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Loparex Germany GmbH and Co KG
Original Assignee
Loparex Germany GmbH and Co KG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Loparex Germany GmbH and Co KG filed Critical Loparex Germany GmbH and Co KG
Priority to EP23834135.8A priority Critical patent/EP4638126A1/fr
Publication of WO2024133242A1 publication Critical patent/WO2024133242A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/30—Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers
    • B32B27/306—Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers comprising vinyl acetate or vinyl alcohol (co)polymers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2250/00—Layers arrangement
    • B32B2250/24—All layers being polymeric
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2250/00—Layers arrangement
    • B32B2250/40—Symmetrical or sandwich layers, e.g. ABA, ABCBA, ABCCBA
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/70—Other properties
    • B32B2307/716—Degradable
    • B32B2307/7166—Water-soluble, water-dispersible
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/70—Other properties
    • B32B2307/732—Dimensional properties
    • B32B2307/737—Dimensions, e.g. volume or area
    • B32B2307/7375—Linear, e.g. length, distance or width
    • B32B2307/7376—Thickness
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/06—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B32B27/08—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/32—Layered products comprising a layer of synthetic resin comprising polyolefins
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/34—Layered products comprising a layer of synthetic resin comprising polyamides
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/36—Layered products comprising a layer of synthetic resin comprising polyesters
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
    • B32B7/02—Physical, chemical or physicochemical properties
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
    • B32B7/04—Interconnection of layers
    • B32B7/06—Interconnection of layers permitting easy separation

Definitions

  • the invention relates to a plastic film which comprises or consists of (a) a layer (a) which contains or is based on polyolefin; (b) optionally a layer (b) which contains or is based on functionalized polyolefin; (c) optionally a layer (c) which is based on water-soluble polymer; (d) a layer (d) which contains or is based on polyamide and/or polyester; (e) optionally a layer (e) which is based on water-soluble polymer; (f) optionally a layer (f) which contains or is based on functionalized polyolefin; and (g) optionally a layer (g) which contains or is based on polyolefin; wherein the plastic film comprises at least one layer which contains or is based on water-soluble polymer.
  • Multilayer films with a polyolefin-containing layer and a non-(mainly) polyolefin-containing layer, for example a polyamide or polyester-containing layer, are used in a variety of applications due to their technical properties.
  • Such multilayer films cannot be recycled economically and ecologically in the sense of a circular economy.
  • the reason for this is that the main raw materials, e.g. polyolefins, polyamides or polyesters, cannot be sufficiently separated from one another.
  • DE 41 20 685 A1 discloses a laminate material which contains at least one layer of thermoplastic material and has a latent inherent delamination potential.
  • the layer of thermoplastic material carries a separating layer of water-soluble or water-dispersible organic material on at least one side.
  • DE 10 2012 006 416 Al relates to a metal layer-free multilayer film with a basis weight of ⁇ 33 g/m 2 , a shrinkage of ⁇ 10% at 90°C (both in the machine direction and transverse to the machine direction, determined as dimensional change according to DIN 53377) and a at least six-layer layer structure comprising a layer (a) composed of at least one thermoplastic olefin homo- or copolymer as one of the outer layers, an adhesion promoter layer (b), a layer (c) composed of at least one homo- and/or copolyamide, at least one internal gas barrier layer (d) adjacent to layer (c) which differs from layers (c) and (e) at least in the composition of the polymer component(s); a layer (e) composed of at least one homo- and/or copolyamide adjacent to the gas barrier layer (d), and a layer (i) composed of at least one homo- and/or copolyamide as one of the outer layers, a use of
  • DE 20 2012 102 659 Ul relates to a self-standing multi-layer composite bag for food, comprising a bag body, a mouth cap and a bag bottom, wherein the mouth cap is attached to one end of the bag body, the bag bottom is attached to the other end of the bag, and both the bag body and the bag bottom both use a composite structure.
  • EP 0 569 196 A1 and US 5 419 967 disclose that by adding methacrylate/unsaturated acid and/or vinylamide copolymers, poly(vinyl alcohol) can be melt processed and coextruded with structural polymers such as poly(ethylene terephthalate) to form multilayer films and articles with good adhesion between the components and good barrier properties.
  • EP 0 934 160 B1 relates to a laminated packaging material comprising a layer of paper or cardboard and external liquid-tight coatings of plastic on both sides of the paper or cardboard web.
  • the packaging material is provided with layers of water-soluble polymer between the paper or cardboard layer and each respective external plastic coating, the layers serving as an adhesive or binder.
  • EP 3 885 095 A1 relates to the use of mixtures of water and essential oil for separating multilayer composites for the pure recycling of polymer or metal foils.
  • US 2018 0369859 A1 relates to films that include a water-soluble layer and a vapor-deposited organic coating.
  • the films exhibit improved barrier properties.
  • US 2019 0366591 Al relates to a process for recycling a first polymer from a multicomponent polymer product.
  • US 2020 0055650 Al relates to films comprising a water-soluble polymer material and a vapor-deposited inorganic coating.
  • US 2020 0199313 A1 relates to water-soluble films made from copolymers of butenediol and vinyl alcohol, wherein the films have improved barrier properties (such as low transmission rates for oxygen and water vapor) and good solubility.
  • WO 2000/077082 A1 relates to a process for separating plastic mixtures, with a polyolefinic plastic fraction or a plastic mixture as starting material, in which the starting material is brought into contact with a solvent and the temperature of the solvent-plastic mixture is adjusted so that a solution with at least one dissolved polymer type is formed, wherein the dissolved polymer type is precipitated from the solution under shear in order to separate the polymer type from other components of the solution.
  • WO 2005/118691 A2 relates to a process for recycling polyamides from waste, wherein the waste is mixed with ester solvent and the mixture is heated to a temperature above the melting temperature of the polyolefins contained therein to form a composition containing dissolved polyamide polymer and a separate immiscible liquid polyolefin phase.
  • WO 2020/136674 A1 relates to a recyclable laminate comprising a first layer and a second layer, each layer being a polyolefin layer having a thickness in the range of 12-100 pm; and an intermediate layer having a thickness in the range of 10-35 pm sandwiched between the first polyolefin layer and the second polyolefin layer, the intermediate layer being a metallized polyolefin film having alcohol-based polymer barrier resins therein.
  • a first release layer is a layer of a composition comprising a) a polymer material having at least one hydrogen atom covalently bonded to an oxygen atom, a nitrogen atom or a sulfur atom; and b) a silicone polyether comprising at least one of polyoxoethylene units or polyoxopropylene units.
  • a second release layer comprises a substrate and a coating of the above composition arranged on a major surface of the substrate. The composition of the release liner can advantageously be dissolved and optionally recycled.
  • WO 20222/46173A1 discloses a recyclable laminate film structure comprising a release coating.
  • the release coating facilitates separation of a selected polymer film during recycling processing by selecting the polymer of the coating composition to have certain Hansen solubility parameters such that the laminate structure delaminates at the layer of the coating, leaving clean pieces of the selected polymer film.
  • the release coating is a barrier coating, for example an oxygen barrier coating.
  • water-soluble polymers in particular butenediol-vinyl alcohol copolymer (BVOH) or polyvinyl alcohol (PVOH) can act as a separating layer or predetermined breaking point in multilayer films.
  • BVOH butenediol-vinyl alcohol copolymer
  • PVOH polyvinyl alcohol
  • the application properties of the final product are not impaired to any relevant extent by the introduction of at least one separating layer or predetermined breaking point based on water-soluble polymer or can be otherwise compensated for by methods familiar to the person skilled in the art.
  • the plastic film according to the invention has good recyclability.
  • a first aspect of the invention relates to a plastic film which
  • a layer (c) based on water-soluble polymer preferably butenediol-vinyl alcohol copolymers (BVOH) and/or polyvinyl alcohols (PVOH);
  • a layer (e) based on water-soluble polymer preferably butenediol-vinyl alcohol copolymers (BVOH) and/or polyvinyl alcohols (PVOH);
  • plastic film optionally a layer (g) which contains or is based on polyolefin; wherein the plastic film comprises at least one layer which contains or is based on water-soluble polymer, preferably butenediol-vinyl alcohol copolymer (BVOH).
  • BVOH butenediol-vinyl alcohol copolymer
  • Layers (a) and (d) of the plastic film according to the invention are necessarily present.
  • Layers (b), (c), (e), (f) and (g) are each optional independently of one another.
  • those of the layers present are arranged in alphabetical order.
  • At least one of the layers (a) to (g) contains water-soluble polymer, optionally in a mixture with non-water-soluble polymer, preferably polyolefin, functionalized polyolefin, polyamide and/or polyester.
  • water-soluble polymer optionally in a mixture with non-water-soluble polymer, preferably polyolefin, functionalized polyolefin, polyamide and/or polyester.
  • the presence of the water-soluble polymer impairs the functioning of the inventive Plastic film or the respective layer is not significant if it is used as intended, e.g. as a release film with release properties.
  • the content of water-soluble polymer in at least one of the layers (a) to (g) makes a significant contribution to the creation of a type of "predetermined breaking point" and the ability of individual components of the plastic film to be separated from one another.
  • layer (c) and optionally also layer (e) on water-soluble polymer do not significantly impair the functionality of the plastic film according to the invention when it is used as intended, e.g. as a release film with release properties. However, when the plastic film according to the invention is used in processes for recovering raw materials used (recycling), layer (c) and any additional layer (e) make a significant contribution to ensuring that individual components of the plastic film can be separated from one another.
  • the plastic film according to the invention comprises a layer (a) which contains or is based on polyolefin; a layer (c) which is based on water-soluble polymer; and a layer (d) which contains or is based on polyamide and/or polyester.
  • the layer (c) is arranged between the layer (a) and the layer (d).
  • the release properties of the release film are not significantly impaired by the presence of the layer (c).
  • the layer (c) enables the material of layer (a) to be separated from the material of layer (d) due to its water solubility and the subsequent recycling, in particular from the material of layers (a) and (d), which may be present in pure form.
  • the plastic film according to the invention can be split along layer (c) into the two materials adjacent to layer (c), i.e. into the material of layer (a) and the material of layer (b) when treated in a water bath, optionally at elevated temperature and after a certain exposure time.
  • the plastic film according to the invention comprises at least one layer which contains or is based on non-water-soluble polymer, preferably polyolefin, functionalized polyolefin, polyamide and/or polyester, in a mixture with water-soluble polymer.
  • non-water-soluble polymer preferably polyolefin, functionalized polyolefin, polyamide and/or polyester
  • the release properties of the release film are not significantly impaired by the presence of the water-soluble polymer.
  • the water-soluble polymer in the layer enables the formation of a predetermined breaking point due to its water solubility.
  • the plastic film according to the invention can then be split along the layer into the two materials adjacent to the layer when treated in a water bath, possibly at an elevated temperature and after a certain exposure time.
  • a layer is "based" on a particular material if this material is the main component of this layer.
  • the weight proportion of the material does not necessarily have to make up more than 50% by weight of the total weight of the respective layer, but this is preferably the case.
  • a layer is "based" on a particular material if this material makes up at least 70% by weight, more preferably at least 80% by weight, even more preferably at least 90% by weight of this layer, in each case based on the total weight of the respective layer.
  • water-soluble means that the material comes off when the composite (the laminate) is placed in a water bath for a sufficient period of time, e.g. 30 minutes, preferably with stirring and optionally at an elevated temperature, e.g. 60°C.
  • the water bath can contain conventional additives, such as surfactants.
  • non-water-soluble means that the material does not come off under the conditions mentioned above.
  • a polymer is water-soluble or non-water-soluble within the meaning of the invention.
  • the water solubility of polymers is preferably determined according to OECD Guideline 105 in the version of July 27, 1995. Alternatively, OECD Guideline 120 in the version of January 21, 2000 can be used.
  • the water solubility of polymers is determined according to COMMISSION REGULATION (EC) No. 440/2008 of May 30, 2008 laying down test methods pursuant to Regulation (EC) No.
  • water-soluble means a solubility in pure water at 20.0 ⁇ 0.5°C of at least 2.0 g/L; accordingly, “water-insoluble” preferably means a solubility of less than 2.0 g/L.
  • This solubility limit was also chosen by the European Chemicals Agency (ECHA) (see Opinion on an Annex XV dossier proposing restrictions on intentionally-added microplastics of 11 June 2020).
  • the water-soluble polymers according to the invention have a water solubility under the conditions mentioned which is significantly above the limit value of 2.0 g/L, preferably at least 5.0 g/L; more preferably at least 10 g/L, even more preferably at least 15 g/L, most preferably at least 20 g/L, and especially at least 25 g/L.
  • Water-soluble polymers according to the invention are preferably virtually unlimitedly miscible with water, in particular at elevated temperatures, but then form gels above a certain concentration, the viscosity of which may increase significantly.
  • the water-soluble polymers according to the invention have a solubility such that at a concentration of 10% by weight in pure water with stirring and continuous heating from 20°C to 85°C at a heating rate of 1°C/min, the polymer is practically completely dissolved after no more than 40 minutes (i.e. when 60°C is reached), preferably after no more than 30 minutes (i.e. when 50°C is reached). This requirement is met, for example, by the products under the name Nichigo G-Polymer®.
  • the water-soluble polymers according to the invention have a solubility such that at a concentration of 5.0% by weight in pure water with stirring at 20°C, the polymer is practically completely dissolved after 2 hours at the latest. This requirement is met, for example, by the product under the name Nichigo G-Polymer® AZF8035W.
  • the water-soluble polymers according to the invention have a solubility such that at a concentration of 5.0% by weight in pure water with stirring at a temperature of 70°C, the polymer is practically completely dissolved after 1 hour at the latest. This requirement is met, for example, by the products under the names Nichigo G-Polymer® AZF8035W, OKS-1001 and OKS 8074P.
  • the water-soluble polymers according to the invention have a solubility such that at a concentration of 5.0% by weight in pure water with stirring at a temperature of 90°C, the polymer is practically completely dissolved after 1 hour at the latest. This requirement is met, for example, by the products under the names Nichigo G-Polymer® AZF8035W, OKS-1001 and OKS 8074P.
  • a film with a layer thickness of 200 ⁇ m which consists of the pure water-soluble polymer, dissolves completely in a sufficient amount of water at 25 °C and with stirring within 6 minutes.
  • Mowiflex® types CI 7, C30, C600, C130T and C500T dissolves completely in a sufficient amount of water at 25 °C and with stirring within 6 minutes.
  • the non-water-soluble polymers according to the invention have a water solubility under the conditions mentioned which is significantly below the limit value of 2.0 g/L (2000 mg/L), preferably at most 1000 mg/L; more preferably at most 500 mg/L, even more preferably at most 100 mg/L, most preferably at most 50 mg/L, and in particular at most 10 mg/L.
  • a polymer is considered to be water-soluble if at least 50 g of this polymer can be homogenized in one liter of pure water at 25°C.
  • polyolefins, functionalized polyolefins, polyesters and polyamides are preferably considered non-water-soluble polymers, and butenediol-vinyl alcohol copolymers (BVOH) and polyvinyl alcohols (PVOH) are considered water-soluble polymers.
  • BVOH butenediol-vinyl alcohol copolymers
  • PVOH polyvinyl alcohols
  • Suitable water-soluble polymers for the purposes of the invention are commercially available, for example under the names Nichigo G-Polymer® and Mowiflex®.
  • the water-soluble polymer according to the invention is a butenediol-vinyl alcohol copolymer (BVOH) or a polyvinyl alcohol (PVOH)
  • BVOH butenediol-vinyl alcohol copolymer
  • PVOH polyvinyl alcohol
  • vinyl acetate was typically used as a (co)monomer in the polymerization and its ester groups were then at least partially saponified.
  • the degree of saponification is preferably at least 80 mol%, more preferably at least 85 mol%, even more preferably at least 90 mol%, most preferably at least 95 mol% and in particular approximately 100 mol%, independently of one another. It may be preferred if the degree of saponification is not complete, for example at most 99 mol%, or at most 98 mol%, or at most 97 mol%.
  • Butenediol-vinyl alcohol copolymers (BVOH) preferred according to the invention have a melt flow index (MFI) at 210°C and 2160 g in the range of 0.5 to 35 g/10 min, more preferably in the range of 1.0 to 30 g/10 min, even more preferably in the range of 1.5 to 20 g/10 min, most preferably in the range of 2.0 to 10 g/10 min, and in particular in the range of 2.5 to 5.0 g/10 min.
  • MFI melt flow index
  • Polyvinyl alcohols (PVOH) preferred according to the invention have a melt flow index at 190°C and 2160 g in the range of 0.5 to 50 g/10 min, more preferably in the range of 1.0 to 45 g/10 min, even more preferably in the range of 1.5 to 40 g/10 min, most preferably in the range of 2.0 to 35 g/10 min, and in particular in the range of 2.5 to 30 g/10 min.
  • mixtures of several water-soluble polymers for example several polyvinyl alcohols (PVOH) with different degrees of saponification, several butenediol-vinyl alcohol copolymers (BVOH) with different degrees of saponification, or also mixtures of polyvinyl alcohols (PVOH) with butenediol-vinyl alcohol copolymers (BVOH).
  • PVOH polyvinyl alcohols
  • BVOH butenediol-vinyl alcohol copolymers
  • the plastic film according to the invention may comprise further layers in addition to the necessarily present layers and the optional layers.
  • the plastic film according to the invention preferably consists of the necessarily present layers and optionally one or more of the optional layers.
  • the plastic film according to the invention comprises at least one layer which contains or is based on water-soluble polymer, wherein the plastic film, when treated in a water bath, optionally at elevated temperature and after a sufficient exposure time, can be split along this layer.
  • the plastic film according to the invention preferably has a total layer thickness in the range from 10 to 250 pm.
  • the plastic film has a total layer thickness of at least 20 pm, more preferably at least 25 pm, even more preferably at least 30 pm, most preferably at least 35 pm and in particular at least 40 pm.
  • the plastic film has a total layer thickness of at most 90 pm, more preferably at most 80 pm, even more preferably at most 70 pm, most preferably at most 60 pm and in particular at most 50 pm.
  • the plastic film according to the invention has a symmetrical layer structure.
  • the plastic film according to the invention is extrudable, preferably coextrudable in one step, more preferably by blown film coextrusion.
  • At least one layer of the plastic film according to the invention contains or is based on extrudable, water-soluble polymer.
  • At least one layer of the plastic film according to the invention contains one or more water-soluble polymers or is based thereon independently selected from
  • the at least one layer of the plastic film according to the invention contains one or more water-soluble polymers or is based thereon selected from polymers or copolymers of vinyl acetate, vinylpyrrolidone, ethylene oxide, acrylamide, and lactic acid; preferably polymers or copolymers of vinyl acetate.
  • At least one layer of the plastic film according to the invention contains one or more water-soluble polymers or is based thereon 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).
  • BVOH butenediol-vinyl alcohol copolymer
  • PVH polyvinyl alcohol
  • PVA polyvinyl acetate
  • PVP polyvinylpyrrolidone
  • PEO polyethylene oxide
  • PAM polyacrylamide
  • PLA polylactic acid
  • At least one layer of the plastic film according to the invention contains butenediol-vinyl alcohol copolymer (BVOH) or is based thereon.
  • BVOH butenediol-vinyl alcohol copolymer
  • at least one layer of the plastic film according to the invention contains or is based on one or more water-soluble polymers with an ethylene group content of at most 10 mol%, more preferably at most 5.0 mol%, even more preferably at most 2.5 mol%, and in particular practically no ethylene groups at all.
  • At least one layer of the plastic film according to the invention contains or is based on one or more water-soluble polymers with a content of vinyl ester groups of at most 20 mol%, more preferably at most 15 mol%, even more preferably at most 10 mol%, most preferably at most 5.0 mol%, and in particular at most 2.5 mol%.
  • At least one layer of the plastic film according to the invention contains one or more water-soluble polymers or is based thereon with a content of vinyl alcohol groups in the range of 40 to 85 mol%, preferably 50 to 75 mol%.
  • At least one layer of the plastic film according to the invention contains one or more water-soluble polymers or is based thereon with a content of butylene groups in the range of 15 to 60 mol%, preferably 25 to 50 mol%.
  • butenediol-vinyl alcohol copolymer is particularly preferred according to the invention because it can be extruded particularly advantageously and can therefore be processed, for example, by blown film coextrusion and at the same time has particularly good water solubility.
  • butenediol-vinyl alcohol copolymer is particularly advantageous compared to polyvinyl alcohol (PVOH) and polyvinyl acetate (PVA).
  • the total content of water-soluble polymer contained in the plastic film is at least 0.5% by weight, more preferably at least 1.0% by weight, even more preferably at least 2.0% by weight, most preferably at least 3.0% by weight and in particular at least 4.0% by weight.
  • the total content of water-soluble polymer contained in the plastic film is at most 18 wt.%, more preferably at most 16 wt.%, even more preferably at most 14 wt.%, most preferably at most 12 wt.% and in particular at most 10 wt.%.
  • the total content of water-soluble polymer contained in the plastic film is at most 10 wt.%, more preferably at most 9.0 wt.%, even more preferably at most 8.0 wt.%, most preferably at most 7.0 wt.% and in particular at most 6.0 wt.%.
  • layer (a) contains or is based on one or more polyolefins independently selected from the group consisting of thermoplastic olefin homopolymers; and/or thermoplastic olefin copolymers of ⁇ , ⁇ -unsaturated olefins having 2 to 10 carbon atoms.
  • layer (a) contains or is based on one or more polyolefins selected independently from the group consisting of polyethylene, polypropylene, polybutylene, polyisobutylene (PI), copolymers and/or mixtures of at least two of the polymers mentioned; preferably polypropylene.
  • polyolefins selected independently from the group consisting of polyethylene, polypropylene, polybutylene, polyisobutylene (PI), copolymers and/or mixtures of at least two of the polymers mentioned; preferably polypropylene.
  • layer (a) contains, based on the total weight of layer (a), at least 50% by weight of polyolefin, more preferably at least 60% by weight, even more preferably at least 70% by weight, most preferably at least 80% by weight and in particular at least 90% by weight.
  • layer (a) contains, based on the total weight of layer (a), at most 10 wt.% of water-soluble polymer, more preferably 5 wt.%, even more preferably at most 2.5 wt.%, most preferably at most 1.0 wt.%, and in particular practically no water-soluble polymer at all.
  • layer (a) contains a mixture of polyolefin and water-soluble polymer.
  • the water-soluble polymer is independently selected from the group consisting of butenediol-vinyl alcohol copolymer (BVOH), polyvinyl alcohol (PVOH), polyvinyl acetate (PVA), polyvinylpyrrolidone (PVP), polyethylene oxide (PEO), polyacrylamide (PAM), and polylactic acid (PLA); preferably butenediol-vinyl alcohol copolymer (BVOH).
  • BVOH butenediol-vinyl alcohol copolymer
  • PVH polyvinyl alcohol
  • PVA polyvinyl acetate
  • PVP polyvinylpyrrolidone
  • PEO polyethylene oxide
  • PAM polyacrylamide
  • PLA polylactic acid
  • BVOH butenediol-vinyl alcohol copolymer
  • the content of water-soluble polymer is greater than the content of polyolefin.
  • the relative weight ratio of water-soluble polymer to polyolefin is in the ratio of 10:1 to 1:10, preferably 8:1 to 1:8, more preferably 6:1 to 1:6, even more preferably 4:1 to 1:4, most preferably 3:1 to 1:3 and in particular 2:1 to 1:2.
  • the relative weight ratio of water-soluble polymer to polyolefin is in the ratio of 11:1 to 1:2, preferably 10:1 to 1:1, more preferably 9:1 to 2:1, even more preferably 8:1 to 3:1, most preferably 7:1 to 4:1 and especially 6:1 to 5:1.
  • the polyolefin content is in the range of 15 ⁇ 14% by weight, preferably 15 ⁇ 12% by weight, more preferably 15 ⁇ 10% by weight, even more preferably 15 ⁇ 8.0% by weight, most preferably 15 ⁇ 6.0% by weight, and in particular 15 ⁇ 4.0% by weight, and - the content of water-soluble polymer 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.%, and in particular 85 ⁇ 4.0 wt.%.
  • layer (a) comprises several layers (ai), (a2), etc.
  • layer (a) is at least three-layered and comprises layer (ai), layer (a2) and layer (as), wherein layer (a2) is arranged between layers (ai) and (as).
  • Layers (ai) and (as) are preferably based on the same polyolefin, which preferably differs from the polyolefin on which layer (as) is based.
  • the layer (a) or the layer (as) is based on polyolefin, preferably olefin homo- or copolymer, which is preferably selected from the group consisting of polyethylene, polypropylene, polybutylene, polyisobutylene, polyhexene, polyoctene, copolymers and/or mixtures of at least two of the polymers mentioned.
  • polyolefin preferably olefin homo- or copolymer, which is preferably selected from the group consisting of polyethylene, polypropylene, polybutylene, polyisobutylene, polyhexene, polyoctene, copolymers and/or mixtures of at least two of the polymers mentioned.
  • the olefin homopolymer or copolymer of layer (a) or ply (as) is an ethylene homopolymer or an ethylene copolymer.
  • the ethylene homo- or copolymer of layer (a) or ply (as) is selected from the group consisting of low density polyethylene (LDPE), linear low density polyethylene (LLDPE), medium density polyethylene (MDPE), and high density polyethylene (HDPE).
  • LDPE low density polyethylene
  • LLDPE linear low density polyethylene
  • MDPE medium density polyethylene
  • HDPE high density polyethylene
  • ethylene homopolymers or copolymers are understood to mean ethylene homopolymers which are based exclusively on ethylene and ethylene copolymers which, in addition to ethylene, are based on at least one other ⁇ , ⁇ -unsaturated olefin having 3 to 10 carbon atoms.
  • Preferred ethylene homopolymers or copolymers are polyethylene with highly branched polymer chains and a low density in the range from 0.915 to 0.940 g/cm 3 (LDPE); polyethylene with an average density in the range from 0.926 to 0.940 g/cm 3 (MDPE); polyethylene with slightly branched polymer chains and a high density in the range from 0.945 to 0.97 g/cm 3 (HDPE); and linear low density polyethylene with short branched polymer chains, which may contain, in addition to ethylene as a comonomer, one or more higher ⁇ , ⁇ -unsaturated olefins such as butylene, hexene or octene, with a density in the range of 0.915 to 0.94 g/cm 3 (LLDPE).
  • LDPE low density in the range from 0.915 to 0.940 g/cm 3
  • MDPE average density in the range from 0.926 to 0.940 g/cm 3
  • the polyolefin on which the layer (a) or the ply (as) is based comprises a mixture of an ethylene homo- or copolymer and a propylene homo- or copolymer.
  • the polyolefin on which the layer (a) or the layer (as) is based comprises a mixture of
  • propylene homopolymers or copolymers are understood to mean propylene homopolymers which are based exclusively on propylene and propylene copolymers which, in addition to propylene, are based on at least one other ⁇ , ⁇ -unsaturated olefin having 2 to 10 carbon atoms.
  • Preferred propylene homopolymers are isotactic propylene homopolymers, preferably with a melting point in the range from 140 to 170 °C.
  • Preferred propylene copolymers are copolymers of propylene and ethylene, the proportion of ethylene preferably being at most 20% by weight, based on the total weight of the propylene copolymer.
  • the layer (a) or the layer (a2) consists of LDPE and a propylene homo- or copolymer.
  • the layer (a) or the layer (a2) consists of LLDPE and a propylene homo- or copolymer.
  • the layer (a) or the layers (ai) and (as) are each independently based on
  • polyolefin wherein the polyolefin is selected from the group consisting of olefin homo- or copolymers of ⁇ , ⁇ -unsaturated olefins having 2 to 10 carbon atoms; or
  • layer (a) or layers (ai) and (as) are each independently based on an ethylene-vinyl acetate copolymer.
  • the layer (a) or the layers (ai) and (as) are each independently based on polyolefin, wherein the polyolefin is selected from the group consisting of olefin homo- or copolymers of ⁇ , ⁇ -unsaturated olefins having 2 to 10 carbon atoms.
  • the polyolefin of layer (a) or of layers (ai) and (as) is preferably selected, each independently of one another, from the group consisting of polyethylene, polypropylene, polybutylene, polyisobutylene, polyhexene, polyoctene, copolymers and/or mixtures of at least two of the polymers mentioned.
  • the olefin homopolymer or copolymer of layer (a) or of layers (ai) and (as) is each independently an ethylene homopolymer or an ethylene copolymer.
  • the ethylene homo- or copolymer of layer (a) or of layers (ai) and (as) is each independently selected from the group consisting of low density polyethylene (LDPE), linear low density polyethylene (LLDPE), medium density polyethylene (MDPE), high density polyethylene (HDPE), and their blends.
  • LDPE low density polyethylene
  • LLDPE linear low density polyethylene
  • MDPE medium density polyethylene
  • HDPE high density polyethylene
  • the layer (a) or the layers (ai) and (as) each independently consist of a mixture of two ethylene homo- or copolymers, preferably of a mixture of LDPE with LLDPE, MDPE, or HDPE.
  • the proportion of LDPE is preferably in the range from 10 to 85% by weight and the proportion of the second ethylene homo- or copolymer is preferably in the range from 15 to 90% by weight.
  • layer (a) has a layer thickness in the range from 0.5 to 100 pm, preferably 0.5 to 25 pm.
  • layer (a) has a layer thickness of at least 4.0 pm, more preferably at least 8.0 pm, even more preferably at least 12 pm, most preferably at least 16 pm and in particular at least 20 pm.
  • layer (a) does not contain a functionalized polyolefin.
  • functionalized polyolefin refers to a copolymer which is based on polyolefin and is formed by copolymerization, preferably graft copolymerization, of the polyolefin with appropriate monomers.
  • appropriate monomers are polar monomers such as acids or acid anhydrides to introduce polar functionalities into the polyolefin.
  • functionalized polyolefin is anhydride-modified polyolefin or acid-modified polyolefin.
  • the layer contains
  • layer (b) contains maleic anhydride-modified polyolefin or is based thereon.
  • layer (b) may optionally contain further polymers, preferably those polymers which are contained in one of the layers adjacent to layer (b), i.e. the same polyolefin which is contained in layer (a) and/or the same water-soluble polymer which is contained in the optionally present layer (c).
  • layer (b) contains, based on the total weight of layer (b), at least 10% by weight of functionalized polyolefin, more preferably at least 15% by weight, even more preferably at least 20% by weight, most preferably at least 25% by weight and in particular at least 30% by weight.
  • layer (b) contains, in addition to the functionalized polyolefin, further polymers, preferably the same (non-functionalized) polyolefin which is contained in layer (a).
  • layer (b) contains, based on the total weight of layer (b), at least 30% by weight of polyolefin and/or functionalized polyolefin, 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.
  • layer (b) contains, based on the total weight of layer (b), at most 10 wt.% of water-soluble polymer, more preferably 5 wt.%, even more preferably at most 2.5 wt.%, most preferably at most 1.0 wt.%, and in particular practically no water-soluble polymer at all.
  • the plastic film according to the invention preferably contains layer (c).
  • layer (b) contains, in addition to the functionalized polyolefin, further polymers, preferably the same water-soluble polymer which is contained in layer (c).
  • layer (b) contains, based on the total weight of layer (b), at least 5.0% by weight of functionalized polyolefin, more preferably at least 7.5% by weight, even more preferably at least 10% by weight, most preferably at least 12.5% by weight and in particular at least 15% by weight.
  • layer (b) contains, based on the total weight of layer (b), at least 45% by weight of water-soluble polymer, more preferably at least 55% by weight, even more preferably at least 65% by weight, most preferably at least 75% by weight and in particular at least 85% by weight.
  • the content of water-soluble polymer 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.%, and in particular 85 ⁇ 4.0 wt.%.
  • the content of water-soluble polymer is greater than the content of functionalized polyolefin.
  • the relative weight ratio of water-soluble polymer to functionalized polyolefin is in the ratio of 10:1 to 1:10, preferably 8:1 to 1:8, more preferably 6:1 to 1:6, even more preferably 4:1 to 1:4, most preferably 3:1 to 1:3 and especially 2:1 to 1:2.
  • the relative weight ratio of water-soluble polymer to functionalized polyolefin is in the ratio of 11:1 to 1:2, preferably 10:1 to 1:1, more preferably 9:1 to 2:1, even more preferably 8:1 to 3:1, most preferably 7:1 to 4:1 and especially 6:1 to 5:1.
  • layer (b) contains, based on the total weight of layer (b), at most 10 wt.% polyolefin, more preferably 5 wt.%, even more preferably at most 2.5 wt.%, most preferably at most 1.0 wt.%, and in particular practically no (unfunctionalized) polyolefin at all.
  • the plastic film according to the invention preferably does not contain layer (c).
  • Layer (b) preferably has a layer thickness in the range from 0.5 to 25 pm, preferably 0.5 to 10 pm.
  • layer (b) has a layer thickness of at least 1.0 pm, more preferably at least 2.0 pm, even more preferably at least 3.0 pm, most preferably at least 4.0 pm and in particular at least 5.0 pm.
  • layer (c) is based on one or more water-soluble polymers independently selected from
  • layer (c) is based on one or more water-soluble polymers selected from polymers or copolymers of vinyl acetate, vinylpyrrolidone, ethylene oxide, acrylamide, and lactic acid; preferably polymers or copolymers of vinyl acetate.
  • layer (c) 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).
  • BVOH butenediol-vinyl alcohol copolymer
  • PVH polyvinyl alcohol
  • PVA polyvinyl acetate
  • PVP polyvinylpyrrolidone
  • PEO polyethylene oxide
  • PAM polyacrylamide
  • PLA polylactic acid
  • layer (c) is based on butenediol-vinyl alcohol copolymer (BVOH).
  • BVOH butenediol-vinyl alcohol copolymer
  • layer (c) is based on one or more water-soluble polymers having an ethylene group content of at most 10 mol%, more preferably at most 5.0 mol%, even more preferably at most 2.5 mol%, and in particular practically no ethylene groups at all.
  • layer (c) is based on one or more water-soluble polymers having a vinyl ester group content of at most 20 mol%, more preferably at most 15 mol%, even more preferably at most 10 mol%, most preferably at most 5.0 mol%, and in particular at most 2.5 mol%.
  • layer (c) is based on one or more water-soluble polymers having a content of vinyl alcohol groups in the range from 40 to 85 mol%, preferably 50 to 75 mol%.
  • layer (c) is based on one or more water-soluble polymers having a content of butylene groups in the range of 15 to 60 mol%, preferably 25 to 50 mol%.
  • layer (c) contains, based on the total weight of layer (c), at least 50% by weight of water-soluble polymer, more preferably at least 60% by weight, even more preferably at least 70% by weight, most preferably at least 80% by weight and in particular at least 90% by weight.
  • layer (c) contains, based on the total weight of layer (c), at most 10% by weight of non-water-soluble polymer, preferably polyolefin and/or functionalized polyolefin, more preferably 5% by weight, even more preferably at most 2.5% by weight, most preferably at most 1.0% by weight, and in particular practically no polyolefin and/or functionalized polyolefin, preferably no non-water-soluble polymer at all.
  • non-water-soluble polymer preferably polyolefin and/or functionalized polyolefin, more preferably 5% by weight, even more preferably at most 2.5% by weight, most preferably at most 1.0% by weight, and in particular practically no polyolefin and/or functionalized polyolefin, preferably no non-water-soluble polymer at all.
  • layer (c) has a layer thickness in the range from 0.5 to 100 pm, preferably 0.5 to 25 pm.
  • layer (c) has a layer thickness of at least 0.5 pm, more preferably at least 0.75 pm, even more preferably at least 1.0 pm, most preferably at least 1.25 pm and in particular at least 1.5 pm.
  • layer (c) has a layer thickness of at most 9.0 pm, more preferably at most 8.0 pm, even more preferably at most 7.0 pm, most preferably at most 6.0 pm and in particular at most 5.0 pm.
  • the layer (d) contains or is based on polyamide and/or polyester, preferably polyamide.
  • Suitable polyamides are thermoplastic, aliphatic, partially aromatic or aromatic polyamide homo- or copolymers.
  • Such polyamides are polyamides made from diamines such as aliphatic diamines with 2-10 carbon atoms, in particular hexamethylenediamine, or aromatic diamines with 6-10 carbon atoms, in particular p-phenylenediamine and dicarboxylic acids such as aliphatic or aromatic dicarboxylic acids with 6-14 carbon atoms such as adipic acid, terephthalic acid or isoterephthalic acid.
  • the polyamides can have been produced from lactams with 4-10 carbon atoms such as 8-caprolactam.
  • Particularly suitable polyamides are, for example, PA 6, PA 12, PA 66, PA 61, PA 6T and/or mixtures of at least two of the polyamides mentioned.
  • Suitable polyesters are thermoplastic, aliphatic, partially aromatic or aromatic polyester homo- or copolymers. Such polyesters are derived from polyols such as ethylene glycol or 1,4-butanediol and dicarboxylic acids or dicarboxylic acid derivatives such as adipic acid and/or terephthalic acid. According to the invention, polycarbonates (PC) can also be used as polyesters.
  • PC polycarbonates
  • PC polybutylene adipate
  • PET polyethylene terephthalate
  • PBT polybutylene terephthalate
  • the corresponding copolymers are preferably suitable.
  • the layer contains
  • layer (d) contains, based on the total weight of layer (d), at least 50% by weight of polyamide and/or polyester, more preferably at least 60% by weight, even more preferably at least 70% by weight, most preferably at least 80% by weight and in particular at least 90% by weight.
  • layer (d) contains, based on the total weight of layer (d), at most 10 wt.% of water-soluble polymer, more preferably 5 wt.%, even more preferably at most 2.5 wt.%, most preferably at most 1.0 wt.%, and in particular practically no water-soluble polymer at all.
  • layer (d) contains a mixture of (i) polyamide and/or polyester and (ii) water-soluble polymer.
  • the water-soluble polymer is independently selected from the group consisting of butenediol-vinyl alcohol copolymer (BVOH), polyvinyl alcohol (PVOH), polyvinyl acetate (PVA), polyvinylpyrrolidone (PVP), polyethylene oxide (PEO), polyacrylamide (PAM), and polylactic acid (PLA), preferably butenediol-vinyl alcohol copolymer (BVOH).
  • the content of water-soluble polymer is greater than the total content of polyamide and/or polyester.
  • the relative weight ratio of water-soluble polymer to the total amount of polyamide and/or polyester is in the ratio of 10:1 to 1:10, preferably 8:1 to 1:8, more preferably 6:1 to 1:6, even more preferably 4:1 to 1:4, most preferably 3:1 to 1:3 and in particular 2:1 to 1:2.
  • the relative weight ratio of water-soluble polymer to the total amount of polyamide and/or polyester is in the ratio of 11:1 to 1:2, preferably 10:1 to 1:1, more preferably 9:1 to 2:1, even more preferably 8:1 to 3:1, most preferably 7:1 to 4:1 and in particular 6:1 to 5:1.
  • polyamide and/or polyester in the range of 15 ⁇ 14% by weight, preferably 15 ⁇ 12% by weight, more preferably 15 ⁇ 10% by weight, even more preferably 15 ⁇ 8.0% by weight, most preferably 15 ⁇ 6.0% by weight, and in particular 15 ⁇ 4.0% by weight, and
  • water-soluble polymer 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.%, and in particular 85 ⁇ 4.0 wt.%.
  • layer (d) has a layer thickness in the range from 0.5 to 100 pm, preferably 0.5 to 25 pm.
  • layer (d) has a layer thickness of at most 22 pm, more preferably at most 19 pm, even more preferably at most 16 pm, most preferably at most 13 pm and in particular at most 10 pm.
  • the layer is based
  • the layer (e) is based on one or more water-soluble polymers independently selected from (i) fully synthetic water-soluble polymers;
  • the layer (e) is based on one or more water-soluble polymers selected from polymers or copolymers of vinyl acetate, vinylpyrrolidone, ethylene oxide, acrylamide, and lactic acid; preferably polymers or copolymers of vinyl acetate.
  • the layer (e) is based on one or more water-soluble polymers independently selected from the group consisting of butenediol-vinyl alcohol copolymer (BVOH), polyvinyl alcohol (PVOH), polyvinyl acetate (PVA), polyvinylpyrrolidone (PVP), polyethylene oxide (PEO), polyacrylamide (PAM), and polylactic acid (PLA).
  • BVOH butenediol-vinyl alcohol copolymer
  • PVH polyvinyl alcohol
  • PVA polyvinyl acetate
  • PVP polyvinylpyrrolidone
  • PEO polyethylene oxide
  • PAM polyacrylamide
  • PLA polylactic acid
  • layer (e) is based on butenediol-vinyl alcohol copolymer (BVOH).
  • BVOH butenediol-vinyl alcohol copolymer
  • the layer (e) is based on one or more water-soluble polymers having an ethylene group content of at most 10 mol%, more preferably at most 5.0 mol%, even more preferably at most 2.5 mol%, and in particular practically no ethylene groups at all.
  • the layer (e) is based on one or more water-soluble polymers having a vinyl ester group content of at most 20 mol%, more preferably at most 15 mol%, even more preferably at most 10 mol%, most preferably at most 5.0 mol%, and in particular at most 2.5 mol%.
  • the layer (e) is based on one or more water-soluble polymers having a content of vinyl alcohol groups in the range of 40 to 85 mol%, preferably 50 to 75 mol%.
  • the layer (e) is based on one or more water-soluble polymers having a content of butylene groups in the range of 15 to 60 mol%, preferably 25 to 50 mol%.
  • the layer (e) contains, based on the total weight of the layer (e), at least 50% by weight of water-soluble polymer, more preferably at least 60% by weight, even more preferably at least 70% by weight, most preferably at least 80% by weight and in particular at least 90% by weight.
  • the layer (e), based on the total weight of the layer (e), contains at most 10 wt.% of non-water-soluble polymer, preferably polyolefin and/or functionalized polyolefin, more preferably 5 wt.%, even more preferably at most 2.5 wt.%, most preferably at most 1.0 wt.%, and in particular practically no polyolefin and/or functionalized polyolefin, preferably no non-water-soluble polymer at all.
  • layer (e) has a layer thickness in the range from 0.5 to 100 ⁇ m, preferably 0.5 to 25 ⁇ m.
  • the layer (e) has a layer thickness of at least 0.5 ⁇ m, more preferably at least 0.75 ⁇ m, even more preferably at least 1.0 ⁇ m, most preferably at least 1.25 ⁇ m and in particular at least 1.5 ⁇ m.
  • the layer (e) has a layer thickness of at most 9.0 ⁇ m, more preferably at most 8.0 ⁇ m, even more preferably at most 7.0 ⁇ m, most preferably at most 6.0 ⁇ m and in particular at most 5.0 ⁇ m.
  • the layer (e) has a layer thickness of at most 4.0 ⁇ m, more preferably at most 3.0 ⁇ m, even more preferably at most 2.5 ⁇ m, most preferably at most 2.0 ⁇ m and in particular at most 1.75 ⁇ m.
  • layer (e) has a different layer structure than layer (c).
  • the layer contains
  • layer (f) contains maleic anhydride-modified polyolefin or is based thereon.
  • layer (f) may optionally contain further polymers, preferably those polymers which are contained in one of the layers adjacent to layer (f), i.e. the same polyolefin which is contained in layer (g) and/or the same water-soluble polymer which is contained in layer (e).
  • layer (f), based on the total weight of layer (f), contains at least 10% by weight of functionalized polyolefin, more preferably at least 15% by weight, even more preferably at least 20% by weight, most preferably at least 25% by weight and in particular at least 30% by weight.
  • layer (f) contains, in addition to the functionalized polyolefin, further polymers, preferably the same (non-functionalized) polyolefin which is contained in layer (g).
  • layer (f) contains, based on the total weight of layer (f), at least 30% by weight of polyolefin and/or functionalized polyolefin, more preferably at least 40 wt.%, even more preferably at least 50 wt.%, most preferably at least 60 wt.% and especially at least 70 wt.%.
  • layer (f) contains, based on the total weight of layer (f), at most 10 wt.% of water-soluble polymer, more preferably 5 wt.%, even more preferably at most 2.5 wt.%, most preferably at most 1.0 wt.%, and in particular practically no water-soluble polymer at all.
  • the plastic film according to the invention preferably contains layer (e).
  • layer (f) contains, in addition to the functionalized polyolefin, further polymers, preferably the same water-soluble polymer which is contained in layer (e).
  • layer (f) contains, based on the total weight of layer (f), at least 5.0 wt.% functionalized polyolefin, more preferably at least 7.5 wt.%, even more preferably at least 10 wt.%, most preferably at least 12.5 wt.% and in particular at least 15 wt.%.
  • layer (f) contains, based on the total weight of layer (f), at least 45% by weight of water-soluble polymer, more preferably at least 55% by weight, even more preferably at least 65% by weight, most preferably at least 75% by weight and in particular at least 85% by weight.
  • water-soluble polymer 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.%, and in particular 85 ⁇ 4.0 wt.%.
  • the content of water-soluble polymer is greater than the content of functionalized polyolefin.
  • the relative weight ratio of water-soluble polymer to functionalized polyolefin is in the ratio of 10:1 to 1:10, preferably 8:1 to 1:8, more preferably 6:1 to 1:6, even more preferably 4:1 to 1:4, most preferably 3:1 to 1:3 and especially 2:1 to 1:2.
  • the relative weight ratio of water-soluble polymer to functionalized polyolefin is in the ratio of 11:1 to 1:2, preferably 10:1 to 1:1, more preferably 9:1 to 2:1, even more preferably 8:1 to 3:1, most preferably 7:1 to 4:1 and especially 6:1 to 5:1.
  • the layer (f) contains, based on the total weight of the layer (f), at most 10 wt.% polyolefin, more preferably 5 wt.%, even more preferably at most 2.5 wt.%, most preferably at most 1.0 wt.%, and in particular practically no (unfunctionalized) polyolefin.
  • the plastic film according to the invention preferably does not contain layer (e).
  • layer (f) has a layer thickness in the range from 0.5 to 25 pm, preferably 0.5 to 10 pm.
  • layer (f) has a layer thickness of at least 1.0 pm, more preferably at least 2.0 pm, even more preferably at least 3.0 pm, most preferably at least 4.0 pm and in particular at least 5.0 pm.
  • layer (f) has a layer thickness of at most 9.0 pm, more preferably at most 8.0 pm, even more preferably at most 7.0 pm, most preferably at most 6.0 pm and in particular at most 5.0 pm.
  • layer (f) has the same layer structure as layer (b).
  • layer (f) has a different layer structure than layer (b).
  • the layer (g) contains or is based on one or more polyolefins independently selected from the group consisting of
  • thermoplastic olefin homopolymers and/or
  • thermoplastic olefin copolymers of ⁇ , ⁇ -unsaturated olefins having 2 to 10 carbon atoms are examples of thermoplastic olefin copolymers of ⁇ , ⁇ -unsaturated olefins having 2 to 10 carbon atoms.
  • the layer (g) contains one or more polyolefins or is based thereon, independently selected from the group consisting of polyethylene, polypropylene, polybutylene, polyisobutylene (PI), copolymers and/or mixtures of at least two of the polymers mentioned; preferably polypropylene.
  • polyolefins or is based thereon, independently selected from the group consisting of polyethylene, polypropylene, polybutylene, polyisobutylene (PI), copolymers and/or mixtures of at least two of the polymers mentioned; preferably polypropylene.
  • the layer (g) contains, based on the total weight of the layer (g), at least 50% by weight of polyolefin, more preferably at least 60% by weight, even more preferably at least 70% by weight, most preferably at least 80% by weight and especially at least 90% by weight.
  • layer (g) contains, based on the total weight of layer (g), at most 10 wt.% water-soluble polymer, more preferably 5 wt.%, even more preferably at most 2.5 wt.%, most preferably at most 1.0 wt.%, and in particular practically no water-soluble polymer at all.
  • layer (g) contains a mixture of polyolefin and water-soluble polymer.
  • the water-soluble polymer is independently selected from the group consisting of butenediol-vinyl alcohol copolymer (BVOH), polyvinyl alcohol (PVOH), polyvinyl acetate (PVA), polyvinylpyrrolidone (PVP), polyethylene oxide (PEO), polyacrylamide (PAM), and polylactic acid (PLA); preferably butenediol-vinyl alcohol copolymer (BVOH).
  • BVOH butenediol-vinyl alcohol copolymer
  • PVH polyvinyl alcohol
  • PVA polyvinyl acetate
  • PVP polyvinylpyrrolidone
  • PEO polyethylene oxide
  • PAM polyacrylamide
  • PLA polylactic acid
  • BVOH butenediol-vinyl alcohol copolymer
  • the content of water-soluble polymer is greater than the content of polyolefin.
  • the relative weight ratio of water-soluble polymer to polyolefin is in the ratio of 10:1 to 1:10, preferably 8:1 to 1:8, more preferably 6:1 to 1:6, even more preferably 4:1 to 1:4, most preferably 3:1 to 1:3 and especially 2:1 to 1:2.
  • the relative weight ratio of water-soluble polymer to polyolefin is in the ratio of 11:1 to 1:2, preferably 10:1 to 1:1, more preferably 9:1 to 2:1, even more preferably 8:1 to 3:1, most preferably 7:1 to 4:1 and especially 6:1 to 5:1.
  • the polyolefin content is in the range of 15 ⁇ 14% by weight, preferably 15 ⁇ 12% by weight, more preferably 15 ⁇ 10% by weight, even more preferably 15 ⁇ 8.0% by weight, most preferably 15 ⁇ 6.0% by weight, and in particular 15 ⁇ 4.0% by weight, and
  • water-soluble polymer 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.%, and in particular 85 ⁇ 4.0 wt.%.
  • layer (g) has a layer thickness in the range from 0.5 to 100 pm, preferably 0.5 to 25 pm.
  • layer (g) has a layer thickness of at least 4.0 pm, more preferably at least 8.0 pm, even more preferably at least 12 pm, most preferably at least 16 pm and in particular at least 20 pm.
  • layer (g) has a layer thickness of at most 22 pm, more preferably at most 19 pm, even more preferably at most 16 pm, most preferably at most 13 pm and in particular at most 10 pm.
  • layer (g) has the same layer structure as layer (a).
  • layer (g) has a different layer structure than layer (a).
  • the layer (a) and the layer (g) can be separated from one another after the cleavage of the plastic film according to the invention along the at least one layer which contains or is based on water-soluble polymer.
  • layer (g) differs from layer (a) in at least one property.
  • the at least one property is selected from color; density; amount and/or type of additives, in particular fillers; amount and/or type of surface coating; amount and/or type of impurities, preferably adhesive components.
  • layer (a) and layer (g) can be separated from one another based on the at least one property.
  • layer (a) has a different color than layer (g).
  • Layers (a) and (g) can preferably be separated from one another based on the different colors. The separation of layers (a) and (g) preferably takes place after the plastic film according to the invention has been split along the at least one layer which contains or is based on water-soluble polymer.
  • layer (a) is black and layer (g) is white.
  • layer (a) is white and layer (g) is black.
  • layer (a) has a different density than layer (g); preferably due to the different amount and/or type of fillers.
  • Layers (a) and (g) can preferably be separated from one another based on the different densities. The separation of layers (a) and (g) preferably takes place after the plastic film according to the invention has been split along the at least one layer which contains or is based on water-soluble polymer.
  • layer (a) contains a larger total amount of filler, preferably layered silicate, than layer (g).
  • layer (a) contains a smaller total amount of filler, preferably layered silicate, than layer (g).
  • layer (a) has a greater density than layer (g).
  • layer (a) has a lower density than layer (g).
  • the plastic film according to the invention can be used in building and construction applications, e.g. as a release film with release properties for bitumen roofing membranes.
  • the plastic film according to the invention can be used to cover bituminous adhesives.
  • the plastic film according to the invention preferably contains a white polyolefin layer, a black polyolefin layer, which is optionally coated with a dehesive surface coating, and a polyamide and/or polyester layer.
  • the polyamide and/or polyester layer can prevent adhesive components from bleeding through the plastic film according to the invention. Nevertheless, one-sided migration of adhesive components into the outer layer facing the adhesive can occur, preferably the black polyolefin layer of the plastic film according to the invention.
  • a density gradient for example through the use of fillers (e.g. chalk) or pigments (e.g. titanium dioxide), is suitable for this.
  • the plastic film according to the invention is surface-coated on at least one side; the plastic film preferably comprises a first outer layer and a second outer layer; a first surface coating which at least partially covers the first outer layer of the plastic film; and optionally a second surface coating which optionally at least partially covers the second outer layer of the plastic film.
  • layer (a) forms the first outer layer.
  • the first surface coating is dehesive.
  • “dehesive” means a release force according to FINAT test method FTM10 (Tesa® test tape 7475, peel speed 300 mm/min, storage conditions 20h/70°C) of at most 50 cN/cm, more preferably at most 40 cN/cm, even more preferably at most 30 cN/cm.
  • the first surface coating is based on polysiloxane.
  • the first surface coating is based on at least one cured polysiloxane which is selected from the group consisting of addition-crosslinked, preferably metal-catalyzed addition-crosslinked, condensation-crosslinked, radically crosslinked, and/or cationically crosslinked polysiloxanes.
  • the first surface coating is based on at least one cured polysiloxane which is selected from the group consisting of polydialkylsiloxanes, preferably polydimethylsiloxanes, and polyalkylarylsiloxanes, preferably polymethylphenylsiloxanes.
  • the first surface coating is adhesive
  • the first surface coating is based on a pressure-sensitive adhesive.
  • the pressure-sensitive adhesive is selected from the group consisting of acrylate-based pressure-sensitive adhesives, rubber-based pressure-sensitive adhesives, polyisobutylene-based pressure-sensitive adhesives, and hot melts.
  • the first surface coating is based on printing ink or varnish.
  • the first surface coating contains a mixture of polysiloxane and water-soluble polymer.
  • 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).
  • BVOH butenediol-vinyl alcohol copolymer
  • PVH polyvinyl alcohol
  • PVA polyvinyl acetate
  • PVP polyvinylpyrrolidone
  • PEO polyethylene oxide
  • PAM polyacrylamide
  • PLA polylactic acid
  • the relative weight ratio of water-soluble polymer to polysiloxane is in the ratio of 10:1 to 1:10, preferably 8:1 to 1:8, more preferably 6:1 to 1:6, even more preferably 4:1 to 1:4, most preferably 3:1 to 1:3 and in particular 2:1 to 1:2.
  • the first surface coating in particular when the first surface coating is dehesive, has a basis weight of at most 5.0 g/m 2 , more preferably at most 4.0 g/m 2 , even more preferably at most 3.0 g/m 2 , most preferably at most 2.0 g/m 2 and in particular at most 1.0 g/m 2 .
  • the basis weight is preferably determined according to FINAT test method FTM7.
  • the first surface coating in particular when the first surface coating is adhesive, has a basis weight of at most 100 g/m 2 , more preferably at most 80 g/m 2 , even more preferably at most 60 g/m 2 , most preferably at most 40 g/m 2 and in particular at most 20 g/m 2 .
  • the basis weight is also preferably determined according to FINAT.
  • the first surface coating can cover the first outer side of the plastic film according to the invention partially or completely, preferably completely.
  • the surface coating should be applied as opaquely as possible.
  • the use of a varnish is therefore recommended, which can be printed on the entire surface, for example, in order to cover the areas covered with the first surface coating as well as the areas not covered with the first surface coating.
  • the second surface coating is dehesive.
  • the second surface coating is based on polysiloxane.
  • the second surface coating is based on at least one cured polysiloxane which is selected from the group consisting of addition-crosslinked, preferably metal-catalyzed addition-crosslinked, condensation-crosslinked, radically crosslinked, and/or cationically crosslinked polysiloxanes.
  • the second surface coating is based on at least one cured polysiloxane which is selected from the group consisting of polydialkylsiloxanes, preferably polydimethylsiloxanes, and polyalkylarylsiloxanes, preferably polymethylphenylsiloxanes.
  • the second surface coating is adhesive
  • the second surface coating is based on a pressure-sensitive adhesive.
  • the pressure-sensitive adhesive is selected from the group consisting of acrylate-based pressure-sensitive adhesives, rubber-based pressure-sensitive adhesives, polyisobutylene-based pressure-sensitive adhesives, and hot melts.
  • the second surface coating is based on printing ink or varnish.
  • the second surface coating in particular when the second surface coating is dehesive, has a basis weight of at most 5.0 g/m 2 , more preferably at most 4.0 g/m 2 , even more preferably at most 3.0 g/m 2 , most preferably at most 2.0 g/m 2 and in particular at most 1.0 g/m 2 .
  • the basis weight is preferably determined according to FINAT test method FTM7.
  • the second surface coating in particular when the second surface coating is adhesive, has a basis weight of at most 100 g/m 2 , more preferably at most 80 g/m 2 , even more preferably at most 60 g/m 2 , most preferably at most 40 g/m 2 and in particular at most 20 g/m 2 .
  • the basis weight is also preferably determined according to FINAT.
  • the second surface coating can cover the second outer side of the plastic film according to the invention partially or completely, preferably completely.
  • the surface coating should be applied as opaquely as possible.
  • the use of a varnish is therefore recommended, which can be printed on the entire surface, for example, in order to cover the areas covered with the second surface coating and the areas not covered with the second surface coating.
  • the plastic film according to the invention is surface-coated on one side, wherein the first surface coating is de-adhesive.
  • the plastic film according to the invention is surface-coated on one side, wherein the first surface coating is adhesive.
  • the plastic film according to the invention is surface-coated on two sides, wherein the first surface coating is dehesive and the second surface coating is adhesive.
  • the plastic film according to the invention is surface-coated on two sides, wherein the first surface coating is adhesive and the second surface coating is dehesive.
  • the plastic film according to the invention comprises between
  • a layer preferably any layer, which contains or is based on polyolefin
  • a layer preferably any layer, containing or based on polyamide and/or polyester; at least one layer containing or based on water-soluble polymer.
  • the layers of the plastic film according to the invention are arranged such that between one or more layers which contain or are based on polyolefin and one or more several layers which contain or are based on polyamide and/or polyester, at least one layer is arranged which contains or is based on water-soluble polymer.
  • no layer which contains or is based on polyolefin is arranged adjacent to a layer which contains or is based on polyamide and/or polyester, or is in direct contact with it.
  • the plastic film according to the invention comprises the layer (a) and optionally the layer (g) which contains or is based on polyolefin; and the layer (d) which contains or is based on polyamide and/or polyester.
  • the plastic film according to the invention additionally comprises the layer (b) and/or the layer (f) which contains polyolefin.
  • the plastic film according to the invention comprises
  • the layer (b) is preferably arranged between the layer (a) and the layer (d); preferably is in direct contact with the layer (a) and/or with the layer (d); wherein the layer (b) preferably contains, in addition to the functionalized polyolefin, further polymers, preferably water-soluble polymer, preferably the same water-soluble polymer which is contained in the layer (c); or
  • the plastic film according to the invention comprises
  • layer (b) is arranged between layer (a) and layer (d); preferably, it is in direct contact with layer (a) and/or with layer (d).
  • the plastic film according to the invention comprises
  • layer (d) is arranged between layer (b) and layer (f); preferably, it is in direct contact with layer (b) and/or with layer (f).
  • the plastic film according to the invention comprises
  • layer (f) is arranged between layer (d) and layer (g); preferably, it is in direct contact with layer (d) and/or with layer (g).
  • the plastic film according to the invention comprises
  • layer (b) is arranged between layer (a) and layer (c); preferably, it is in direct contact with layer (a) and/or with layer (c).
  • layer (c) is arranged between layer (b) and layer (d); preferably, it is in direct contact with layer (b) and/or with layer (d).
  • the plastic film according to the invention comprises
  • layer (d) is arranged between layer (c) and layer (e); preferably, it is in direct contact with layer (c) and/or with layer (e).
  • the plastic film according to the invention comprises
  • layer (e) is arranged between layer (d) and layer (f); preferably, it is in direct contact with layer (d) and/or with layer (f).
  • the plastic film according to the invention comprises
  • layer (f) is arranged between layer (e) and layer (g); preferably, it is in direct contact with layer (e) and/or with layer (g).
  • the plastic film according to the invention has the following structure:
  • - layer (a) which is based on polyolefin, preferably polypropylene;
  • layer (b) containing the same polyolefin as contained in layer (a) and functionalized polyolefin;
  • - layer (c) which is based on water-soluble polymer, preferably butenediol-vinyl alcohol copolymers (BVOH) and/or polyvinyl alcohols (PVOH);
  • BVOH butenediol-vinyl alcohol copolymers
  • PVH polyvinyl alcohols
  • BVOH butenediol-vinyl alcohol copolymers
  • PVOH polyvinyl alcohols
  • the plastic film according to the invention has the following structure:
  • - layer (c) which is based on water-soluble polymer, preferably butenediol-vinyl alcohol copolymers (BVOH) and/or polyvinyl alcohols (PVOH);
  • BVOH butenediol-vinyl alcohol copolymers
  • PVH polyvinyl alcohols
  • BVOH butenediol-vinyl alcohol copolymers
  • PVOH polyvinyl alcohols
  • the plastic film according to the invention has the following structure:
  • - layer (a) which is based on polyolefin, preferably polypropylene;
  • - layer (b) which contains water-soluble polymer, preferably butenediol-vinyl alcohol copolymers (BVOH) and/or polyvinyl alcohols (PVOH), which is present in a mixture with functionalized polyolefin;
  • - layer (d) which is based on polyamide;
  • - layer (f) which contains water-soluble polymer, preferably butenediol-vinyl alcohol copolymers (BVOH) and/or polyvinyl alcohols (PVOH), which is present in a mixture with functionalized polyolefin;
  • BVOH butenediol-vinyl alcohol copolymers
  • PVH polyvinyl alcohols
  • the plastic film has a layer structure selected from
  • the plastic film is cleavable along the at least one layer which contains or is based on water-soluble polymer when treated in a water bath, optionally at elevated temperature and after a sufficient exposure time.
  • the plastic film according to the invention can be split at elevated temperature in a water bath and contamination of the plastic film is washed off beforehand at a lower temperature.
  • the plastic film according to the invention is split into at least two film layers; preferably at least one layer which contains or is based on polyolefin and at least one layer which contains or is based on polyamide and/or polyester.
  • the plastic film according to the invention comprises layers (a), (d) and (g), which are obtained as separate layers when the plastic film according to the invention is split.
  • All layers of the plastic film according to the invention can contain conventional additives in conventional amounts.
  • Conventional additives are selected from the group consisting of fillers, such as CaCCE, layered silicates such as talc, plasticizers; lubricants; emulsifiers; pigments; rheology additives; catalysts; flow control agents; impact modifiers, optical brighteners; light stabilizers; antioxidants; clarifying agents, such as substituted or unsubstituted Bisbenzylidene sorbitols; flame retardants; antistatic agents; UV absorbers such as benzoxazinones; blowing agents; and thiosynergists such as thiodipropionic acid dilauryl esters or thiodipropionic acid distearyl esters.
  • a preferred plasticizer for water-soluble polymers is glycerin.
  • the plastic film according to the invention can be produced by conventional methods known to those skilled in the art and optionally subsequently provided with the first surface coating on the first outer side. Preferred methods are blown film extrusion or casting methods (casting methods).
  • the layers can be applied to the substrate by coextrusion (film extrusion), as a polymer coating (extrusion coating) or as an independent coating (coating, printing, varnish) before the first and second surface coatings (silicone, adhesive, etc.).
  • the water-soluble polymer preferably forms sufficient adhesion to the polyamide and/or polyester layer by coextrusion.
  • the bonding to the polypropylene layer is preferably achieved using functionalized polyolefins, e.g. with MAH.
  • the water-soluble polymer is also preferably suitable for the blown film process and can be extruded on conventional or existing extrusion lines (e.g. E37). Additional adjustments familiar to the person skilled in the art may be necessary for sufficient bonding, such as corona treatment.
  • the plastic film according to the invention can be subjected to conventional recycling processes, which typically include treatment in a water bath.
  • the structure of the plastic film according to the invention now makes it possible to dissolve the water-soluble layer or the water-soluble polymers (almost) without residue during the recycling process.
  • the resulting aqueous waste, which contains the water-soluble polymer is easy to dispose of when biodegradable and environmentally friendly polymers are used and does not negatively affect the sustainability of the new film design.
  • a further aspect of the invention relates to a process for producing a plastic film according to the invention as described above by blown film coextrusion.
  • the extrusion of the plastic film takes place in one step.
  • a further aspect of the invention relates to a plastic film obtainable by the inventive method described above.
  • a further aspect of the invention relates to the use of the above-described plastic film according to the invention for recycling some of its components.
  • the plastic film is split after or during the treatment in a water bath, optionally at elevated temperature and after a sufficient exposure time, along at least one layer which contains or is based on water-soluble polymer.
  • Figure 1 shows schematically a cross section of a plastic film according to the invention with a layer (1) based on a polyolefin, e.g. PP, a layer (2) containing functionalized polyolefin, e.g. PP+MAH, a layer (3) based on a water-soluble polymer, e.g. BVOH/PVOH, a layer (4) based on a water-soluble polymer, e.g. BVOH/PVOH, a layer (5) containing functionalized polyolefin, e.g. PP+MAH, and a layer (7) based on a polyolefin, e.g. PP.
  • a polyolefin e.g. PP
  • a layer (2) containing functionalized polyolefin e.g. PP+MAH
  • a layer (3) based on a water-soluble polymer, e.g. BVOH/PVOH
  • Figure 2 shows the treatment of the plastic film shown in Figure 1 in a container (8) which is precipitated with warm water (9).
  • the water-soluble polymer dissolves in the water (9) so that the layers (3) and (5) based on water-soluble polymer are dissolved.
  • the composite of the polyolefin-based layer (1) and the functionalized polyolefin-containing layer (2) separates from the polyamide-based layer (4) and the composite of the functionalized polyolefin-containing layer (6) and the polyolefin-based layer (7).
  • the separated layers or composites can be disposed of separately or recycled.
  • Multilayer plastic films were produced by blown film co-extrusion. The individual layers are immediately adjacent to one another in the order in which they are listed in the table below:
  • Multilayer plastic films were produced by blown film co-extrusion. The individual layers are immediately adjacent to one another in the order in which they are listed in the table below:
  • a multilayer plastic film was produced by blown film co-extrusion.
  • the individual layers are immediately adjacent to one another in the order in which they are listed in the table below:
  • a multilayer plastic film was produced by blown film co-extrusion.
  • the individual layers are immediately adjacent to one another in the order in which they are listed in the table below:

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  • Laminated Bodies (AREA)

Abstract

L'invention concerne un film plastique comprenant (a) une couche (a) qui contient une polyoléfine ou est à base de celle-ci ; (b) éventuellement une couche (b) qui contient une polyoléfine fonctionnalisée ou est à base de celle-ci ; (c) éventuellement une couche (c) qui est à base d'un polymère soluble dans l'eau ; (d) une couche (d) qui contient un polyamide et/ou un polyester ou est à base de celui-ci ; (e) éventuellement une couche (e) qui est à base d'un polymère soluble dans l'eau ; (f) éventuellement une couche (f) qui contient une polyoléfine fonctionnalisée ou est à base de celle-ci ; et (g) éventuellement une couche (g) qui contient une polyoléfine ou est à base de celle-ci. Le film plastique comprend au moins une couche qui contient un polymère soluble dans l'eau ou est à base de celui-ci.
PCT/EP2023/086619 2022-12-19 2023-12-19 Film plastique recyclable Ceased WO2024133242A1 (fr)

Priority Applications (1)

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EP23834135.8A EP4638126A1 (fr) 2022-12-19 2023-12-19 Film plastique recyclable

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DE102022213878 2022-12-19
DE102022213878.3 2022-12-19

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Citations (17)

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EP0569196A1 (fr) 1992-05-04 1993-11-10 Rohm And Haas Company Films multicouche coextrudés avec une haute imperméabilité aux gaz
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EP3885095A1 (fr) 2020-03-23 2021-09-29 Covestro Deutschland AG Utilisation des mélanges d'eau et d'huile essentielle pour séparer des composites multicouche pour le recyclage séparé des feuilles polymères ou métalliques feuilles métalliques
WO2021255544A1 (fr) 2020-06-17 2021-12-23 3M Innovative Properties Company Revêtements antiadhésifs et articles les comprenant
WO2022246173A1 (fr) 2021-05-20 2022-11-24 Sun Chemical Corporation Revêtement barrière à l'oxygène en tant que revêtement de couche de séparation
EP4272952A1 (fr) * 2022-05-04 2023-11-08 B&T Entwicklungs- und Vermarktungsgesellschaft mbH Multicouche polymère

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Publication number Priority date Publication date Assignee Title
DE4120685A1 (de) 1991-06-22 1992-12-24 Hoechst Ag Schichtstoffmaterial mit latent inhaerentem delaminierungspotential
EP0569196A1 (fr) 1992-05-04 1993-11-10 Rohm And Haas Company Films multicouche coextrudés avec une haute imperméabilité aux gaz
US5419967A (en) 1992-05-04 1995-05-30 Rohm And Haas Company High gas barrier co-extruded multilayer films
EP0934160B1 (fr) 1995-10-30 2004-08-18 Tetra Laval Holdings & Finance SA Stratifie d'emballage pouvant etre delamine et son procede de fabrication
WO2000077082A1 (fr) 1999-06-16 2000-12-21 Der Grüne Punkt-Duales System Deutschland Ag Procede de separation de matieres plastiques polyolefiniques melangees
WO2005118691A2 (fr) 2004-06-04 2005-12-15 Chemical Products Corporation Separation de polyolefines de polyamides
DE102012006416A1 (de) 2011-12-09 2013-06-13 Maria Soell High Technology Films Gmbh Metallschicht-freie Mehrschichtfolie mit geringem Flächengewicht
DE202012102659U1 (de) 2011-12-28 2012-08-14 Ningbo Ruicheng Packing Material Co., Ltd. Selbststehender mehrlagiger Verbundbeutel für Nahrungsmittel
US20190054721A1 (en) * 2016-02-15 2019-02-21 Macro Technology Inc. Multilayer Barrier Film
US20200199313A1 (en) 2017-04-07 2020-06-25 The Procter & Gamble Company Water-soluble films
US20200055650A1 (en) 2017-06-22 2020-02-20 The Procter & Gamble Company Films including a water-soluble layer and a vapor-deposited inorganic coating
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US20190366591A1 (en) 2018-06-05 2019-12-05 Braskem S.A. Recycling processes for laminates and multi-layers
WO2020136674A1 (fr) 2018-12-26 2020-07-02 Huhtamaki Ppl Limited Stratifié recyclable
EP3885095A1 (fr) 2020-03-23 2021-09-29 Covestro Deutschland AG Utilisation des mélanges d'eau et d'huile essentielle pour séparer des composites multicouche pour le recyclage séparé des feuilles polymères ou métalliques feuilles métalliques
WO2021255544A1 (fr) 2020-06-17 2021-12-23 3M Innovative Properties Company Revêtements antiadhésifs et articles les comprenant
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EP4272952A1 (fr) * 2022-05-04 2023-11-08 B&T Entwicklungs- und Vermarktungsgesellschaft mbH Multicouche polymère

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