WO2009049667A1 - Feuille multicouche et son procédé de fabrication - Google Patents

Feuille multicouche et son procédé de fabrication Download PDF

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Publication number
WO2009049667A1
WO2009049667A1 PCT/EP2007/060984 EP2007060984W WO2009049667A1 WO 2009049667 A1 WO2009049667 A1 WO 2009049667A1 EP 2007060984 W EP2007060984 W EP 2007060984W WO 2009049667 A1 WO2009049667 A1 WO 2009049667A1
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WO
WIPO (PCT)
Prior art keywords
layer
film
multilayer film
starch
thermoplastic
Prior art date
Application number
PCT/EP2007/060984
Other languages
German (de)
English (en)
Inventor
Harald Schmidt
Christoph Hess
Johannes Mathar
Ralf Hackfort
Original Assignee
Biotec Biologische Naturverpackungen Gmbh & 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.)
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Publication date
Application filed by Biotec Biologische Naturverpackungen Gmbh & Co. Kg filed Critical Biotec Biologische Naturverpackungen Gmbh & Co. Kg
Priority to PCT/EP2007/060984 priority Critical patent/WO2009049667A1/fr
Publication of WO2009049667A1 publication Critical patent/WO2009049667A1/fr

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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
    • B32B27/36—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
    • B32B23/00—Layered products comprising a layer of cellulosic plastic substances, i.e. substances obtained by chemical modification of cellulose, e.g. cellulose ethers, cellulose esters, viscose
    • B32B23/04—Layered products comprising a layer of cellulosic plastic substances, i.e. substances obtained by chemical modification of cellulose, e.g. cellulose ethers, cellulose esters, viscose comprising such cellulosic plastic substance as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B32B23/08—Layered products comprising a layer of cellulosic plastic substances, i.e. substances obtained by chemical modification of cellulose, e.g. cellulose ethers, cellulose esters, viscose comprising such cellulosic plastic substance as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • 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
    • B32B2250/03—3 layers
    • 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
    • B32B2307/50—Properties of the layers or laminate having particular mechanical properties
    • B32B2307/54—Yield strength; Tensile strength
    • 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
    • B32B2307/724—Permeability to gases, adsorption
    • 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
    • B32B2439/00—Containers; Receptacles
    • B32B2439/70—Food packaging

Definitions

  • the invention relates to a multilayer film, in particular for packaging purposes, comprising at least two layers A and B.
  • the invention further relates to a process for the production of the multilayer film as well as packaging materials produced therefrom.
  • Multilayer films of the type mentioned above are well known and are used, for example, for the packaging of food and other goods. It is also necessary for the packaging of oxygen-sensitive foods that the films have a low oxygen permeability. Such films are also referred to as "barrier films”. They are used, for example, in the packaging of fresh meat or fruit and vegetables, the durability of which can be considerably extended by targeted adjustment of the gas barrier, in particular the oxygen and / or water vapor barrier.
  • barrier films used today in the packaging industry consist of plastics derived from petrochemicals.
  • the present invention is therefore based on the object to provide a multilayer film of the type mentioned, which has good barrier properties and which is made from renewable resources and / or biodegradable. Furthermore, the film should have sufficient mechanical strength and beyond moisture-insensitive and inexpensive and depending on the application have good transparency.
  • a multilayer film in particular for packaging purposes, which comprises at least a first layer A and at least one second layer B, the layer A containing at least one thermoplastic polyester and the layer B thermoplastic starch.
  • An essential feature of the multilayer film according to the invention is that its layer structure contains on the one hand thermoplastic polyester (layer A) and on the other hand thermoplastic starch (layer B). Surprisingly, it has been found that multilayer films containing this combination of materials have exceptionally good properties as packaging films.
  • the films of the invention are characterized by excellent barrier properties and have in particular a low oxygen and carbon dioxide permeability.
  • the films also have excellent mechanical strength and low moisture sensitivity. If desired, thermoformable films with excellent transparency can also be produced with the layer structure according to the invention.
  • the multilayer film according to the invention is distinguished by excellent mechanical strength and can be excellently processed for the production of packaging.
  • tensile strength values according to DIN 53455 in the range 10 to 40 N / mm 2 , in particular 15 to 30 N / mm 2 can be achieved with the layer structure according to the invention.
  • the multilayer films according to the invention are furthermore distinguished by excellent barrier properties.
  • the multilayer film of the invention preferably has an oxygen permeability according to ASTM F 1927-98 at 23 0 C, 50% rh and 400 microns film thickness of 1 to 50, especially 1.5 to 20 cm 3 / m 2 d, more preferably 2 to 10 cm 3 / m 2 d.
  • the multilayer film according to the invention preferably has a water vapor permeability according to ASTM F 1249 at 23 0 C, 75 rF and 400 microns film thickness of 1 to 100, especially 2 to 10 cm 3 / m 2 d.
  • the multilayer film according to the invention preferably has a carbon dioxide permeability according to ASTM D 1434 at 23 ° C., 50 rF and 400 ⁇ m film thickness of 0.5 to 5, in particular 1 to 2.5 cm 3 / m 2 d. Due to the above-mentioned barrier properties is the invention Multi-layer film ideal as a barrier film for packaging purposes.
  • the multilayer film of the invention may have any desired thickness, the thickness of the film significantly depending on the intended application and the desired film properties.
  • the film preferably has a total thickness of 10 to 2000 .mu.m, in particular 100 to 2000 .mu.m, more preferably 200 to 800 .mu.m, wherein the individual layers preferably each have a thickness of 5 to 1000 .mu.m, in particular 10 to 1000 .mu.m preferred 20 to 700 microns, more preferably 10 to 700 microns possess.
  • Multilayer-based blown films preferably have a total thickness of 30 to 100 ⁇ m.
  • the packaging produced from the multilayer films of the invention may have any thickness.
  • From the multilayer films of the invention produced trays for the packaging of food preferably have a total thickness of 350 to 400 .mu.m, the corresponding lidding films preferably has a thickness of 30 to 100 microns.
  • the multilayer film according to the invention comprises at least one layer A and at least one layer B.
  • the film according to the invention may comprise any further layers.
  • the multilayer film according to the invention comprises at least two layers A and one layer B, the layer B preferably being arranged between the two layers A. is.
  • Such a multilayer film has the following layer structure: Layer A - Layer B - Layer A.
  • the layer A can adjoin the layer B directly.
  • adhesion promoter layers H are known to the person skilled in the art and preferably consist of block copolymer.
  • Adhesion promoter layer H preferably directly adjoins layer A on its one surface side and directly on layer B on its other surface side and serves to improve the adhesion between layers A and B.
  • the following layer structure is given as an example of a multilayer film according to the invention containing adhesion promoter layers Layer A - Adhesive layer H - Layer B - Adhesive layer H - Layer A.
  • the film may comprise further layers A and / or B. It is also possible, for example, a multilayer film with the following layer structure: Layer A - Layer B - Layer A - Layer B - Layer A. Due to the double-provided layer B, such a film has even better barrier properties.
  • an adhesion promoter layer H can be arranged between the individual layers.
  • the layer A of the multilayer film contains at least one thermoplastic polyester.
  • the selection of the thermoplastic polyester is not limited. Both aliphatic and aromatic polyesters and their copolymers and / or mixtures are suitable.
  • Thermoplastic polyesters are well known and described, for example, in Oberbach et al. "Saechtling plastic paperback", 29th ed., Hanser-Verlag, Kunststoff (2004) described.
  • thermoplastic polyester contained in layer A is a biodegradable thermoplastic polyester according to EN 13432.
  • thermoplastic polyester may be a biopolymer based on one or more hydroxycarboxylic acids.
  • thermoplastic polyesters are poly (hydroxyalkanoates) (PHA), polyalkylene succinates (PAS), e.g.
  • PBS Polybutylene succinate
  • PAT polyalkylene terephthalate
  • PET poly (ethylene terephthalate)
  • PPDO poly-[p-dioxanone]
  • Bio-PDO biopropanediol
  • layer A contains at least one polyhydroxyalkanoate (PHA) as thermoplastic polyester.
  • polyhydroxy [hydroxyalkanoates] examples include poly (hydroxyethanoate) such as polyglycolic acid (PGA), poly (hydroxypropanoate) such as polylactic acid or polylactide (PLA), poly [hydroxybutanoate] such as polyhydroxybutyric acid (PHB), poly (hydroxypentanoate) such as Polyhydroxyvalerate (PHV) and / or poly (hydroxyhexanoate) such as polycaprolactone (PCL), as well as copolymers and mixtures thereof.
  • poly (hydroxyethanoate) such as polyglycolic acid (PGA), poly (hydroxypropanoate) such as polylactic acid or polylactide (PLA), poly [hydroxybutanoate] such as polyhydroxybutyric acid (PHB), poly (hydroxypentanoate) such as Polyhydroxyvalerate (PHV) and / or poly (hydroxyhexanoate) such as polycaprolactone (PCL), as well as copolymers and mixtures thereof.
  • a thermoplastic polyester which is particularly suitable according to the invention is polylactic acid or polylactide (PLA).
  • PLA is a biodegradable polyester that can be prepared by a multi-step synthesis of sugar. In this case, sugar is fermented to lactic acid and this polymerized usually via the intermediate of the dilactide to PLA.
  • PLA is transparent, crystalline, rigid, has high mechanical strength and can be processed by conventional thermoplastic processes. Suitable polymers based on PLA are described, for example, in US Pat. Nos. 6,312,823, 5,142,023, 5,274,059, 5,274,073, 5,258,488, 5,357,035, 5,338,822 and 5,359 026. According to the invention PLA can be used both as a virgin material and in the form of recycled material.
  • thermoplastic polyester is polyhydroxybutyric acid (PHB).
  • PHB polyhydroxybutyric acid
  • Suitable polymers based on PHB are described, for example, in US Pat. Nos. 4,393,167, 4,880,592 and 5,391,423.
  • Suitable materials for layer A of the present invention are, in particular, the "aliphatic polyester polymers" described in US Pat. No. 6,312,823, the description of which is incorporated herein by reference and which is the subject of the present disclosure.
  • thermoplastic polyesters are, for example, polycaprolactone / polybutylene succinate mixtures or copolymers (PCL / PBS), polyhydroxybutyric acid / polyhydroxyvalerate copolymers (PHB / PHV),
  • PHBV Polyhydroxybutyrate valerate
  • PBS / PBA polybutylene succinate / polybutylene adipate blends or copolymers
  • PET / PES polyethylene terephthalate / polyethylene succinate copolymers
  • PBT / PBA polybutylene terephthalate / polybutylene adipate copolymers
  • Layer A may contain other components besides thermoplastic polyester.
  • the layer A may consist of a mixture of different polymers.
  • Layer A may also contain conventional additives such as processing aids, plasticizers, stabilizers, antiflams and / or fillers.
  • a bonding agent can be added, which serve in particular to improve the adhesion between layer A and B. can.
  • layer A contains thermoplastic polyester in an amount of at least 20% by weight, in particular at least 30% by weight or at least 40% by weight, more preferably at least 50% by weight or at least 60% by weight, even more preferably at least 80% by weight. %, and most preferably at least 90% by weight. or at least 95% by weight, based on the total weight of layer A. More preferably, layer A consists essentially of thermoplastic polyester.
  • Processing aids which can be used according to the invention are generally known to the person skilled in the art. In principle, all processing aids are suitable which are suitable for improving the processing behavior of the polymers used, in particular their flow behavior in the extruder.
  • processing aids according to the invention are polymers which have a polymer backbone which is functionalized or modified with reactive groups. Such polymers are also referred to as "functionalized polymers".
  • the processing aids used according to the invention preferably have a molecular weight of up to 200,000, in particular up to 100,000.
  • all polymers which are miscible with at least one polymer component (eg PLA) from at least one layer of the multilayer film (eg layer A) are suitable as the polymer backbone for the processing aid.
  • Possible polymer scaffolds for the processing aid are, for example Ethylene vinyl acetate (EVA), polyethylene (PE), polypropylene (PP), ethylene acrylates, polyesters (eg, PLA), as well as blends and / or copolymers (eg, polyethylene-methyl acrylate copolymer or polyethylene-butyl acrylate copolymer) thereof.
  • Suitable reactive groups for the processing aids used according to the invention are, in principle, all reactive groups which are suitable for chemically reacting with at least one polymer component (for example TPS) from at least one layer of the multilayer film (for example layer B).
  • Suitable reactive groups are, for example, maleic anhydride and / or other anhydrides of suitable carboxylic acids or dicarboxylic acids or other polybasic acids.
  • the backbone having reactive groups in an amount of 0.01 to 7 wt.%, Particularly 0.1 to 5 wt.%, More preferably 0.3 to 4 wt.%, Based on the total composition of the processing aid , modified.
  • the reactive groups are grafted onto the polymer backbone.
  • processing aids are commercially available, for example, under the trade names Lotader® and Orevac® (Arkema Inc., USA), Fusabond®, Biomax strong® and Bynel® (DuPont, USA) and Plexar® (Equistar Chemical Company, USA).
  • the processing aid is preferably used in an amount of up to 5% by weight, especially 0.01 to 2% by weight, more preferably 0.1 to 1.5% by weight, still more preferably 0.2 to 1% by weight, and most preferred in an amount of less than 1% by weight, based on the total composition of the respective layer.
  • the processing aid used for layer A is a maleic anhydride-modified polymer based on ethylene, in particular a maleic anhydride-modified polyethylene-alkyl acrylate copolymer.
  • layer B of the multilayer film contains thermoplastic starch.
  • thermoplastic starch or thermoplastically processable starch is generally known and described in detail, for example, in the publications EP 0 397 819 B1, WO 91/16375 A1, EP 0 537 657 B1 and EP 0 702 698 B1. With a market share of about 80 percent, thermoplastic starch is the most important and common representative of bioplastics.
  • Thermoplastic starch is generally made from native starch such as potato starch. To make native starch thermoplastically processable, their plasticizers such as sorbitol and / or Added glycerin.
  • Thermoplastic starch is characterized by a low water content, which is preferably less than 6% by weight, based on the total weight of the thermoplastic starch.
  • thermoplastic starch is characterized by its preferably substantially amorphous structure.
  • thermoplastic starch it is preferable to use a polymeric material obtainable by homogenizing a mixture containing
  • the mixture may contain, in addition to the main constituents starch or starch derivative, plasticizer and water, also suitable additives, fillers and / or processing aids, as described in more detail above in connection with layer A.
  • the mixture contains no synthetic, according to EN 13432 biodegradable thermoplastic polymer.
  • no additional thermoplastic polymeric material is added to the mixture at all.
  • the total amount of the additives and processing aids contained in the mixture is preferably not more than 5% by weight, especially not more than 3% by weight, more preferably not more than 2% by weight.
  • fillers inorganic fillers are preferably used. If a polymeric material is used as the additive, filler and / or processing agent, it is preferably non-thermoplastic and / or not biodegradable according to EN 13432.
  • the mixture for producing the thermoplastic starch contains 45 to 80% by weight, in particular 50 to 75% by weight, preferably 55 to 72% by weight, more preferably 58 to 70% by weight, most preferably 59 up to 67% by weight of starch and / or starch derivative. Further, the mixture for producing the thermoplastic starch preferably contains 20 to 50% by weight, especially 25 to 45% by weight, preferably 28 to 42% by weight, more preferably 30 to 40% and most preferably 35 to 38% by weight of plasticizer.
  • thermoplastic starch or the starch derivative are preferably selected from native potato starch, tapioca starch, rice starch and corn starch.
  • the plasticizer or plasticizer for producing the thermoplastic starch is preferably selected from the group consisting of ethylene glycol, propylene glycol, glycerol, 1, 4-propanediol, 1, 2-butanediol, 1,3-butanediol, 1, 4-butanediol, 1 , 5-pentanediol, 1,5-hexanediol, 1,6-hexanediol, 1,2,6-hexanetriol, 1,3,5-hexanetriol, neopentyl glycol, sorbitol acetate, sorbitol diacetate, sorbitan monoethoxylate, sorbitol diethoxylate, sorbitol hexaethoxylate, sorbitol dipropoxylate, aminosorbitol, trihydroxymethylaminomethane , Glucose / PEG, the Reaction product of ethylene oxide with glucose, trimethylolpropane mono
  • Carboxymethyl sorbitol polyglycerol monoethoxylate, erythritol, pentaerythritol, arabitol, adonite, xyitol, mannitol, iditol, galactitol, alite, sorbitol, polyhydric alcohols in general, glycerol esters, formamide, N-methylformamide, DMSO, mono- and diglycerides, alkylamides, polyols, trimethylolpropane, Polyvinyl alcohol having 3 to 20 recurring units, polyglycerols having 2 to 10 recurring units and derivatives and / or mixtures thereof.
  • the plasticizer further preferably has a solubility parameter (HiIdebrand parameter) d (SI) of 30-50 MPa 1 "2 within a temperature range of about 150 to 300 ° C.
  • Particularly suitable plasticizers are glycerol and / or sorbitol.
  • layer B is obtained by adding at least partially of thermoplastically processable starch having a water content of less than 6% by weight, preferably less than 5% by weight, in particular less than 4.5% by weight ; more preferably less than 4% by weight, based on the total composition of the starch.
  • the water content of the mixture is preferably 0.5 to 12% by weight, more preferably 1 to 7% by weight, more preferably 1 to 6% by weight, still more preferably 1.5 to 4.5% by weight. %, based on the total composition of the thermoplastically processable starch adjusted. _ 1 ⁇
  • thermoplastically processable starch with the stated water contents in particular ⁇ 6% by weight
  • improved flow behavior in the extruder and reduced microbubble formation in the layer can be achieved.
  • thermoplastically processable starch used preferably has a water content of at least 1% by weight, in particular at least 1.5% by weight, since otherwise thermally induced oxidation processes and, correspondingly, unwanted discoloration of the product can easily occur. Conversely, with a water content greater than about 6% by weight, increased microbubble formation can easily occur, which is also undesirable.
  • the homogenization of the starch-containing mixture in the production of the thermoplastic starch is preferably carried out by the action of shear forces on the mixture. Suitable homogenization methods are, for example, dispersing, stirring, kneading and / or extruding. According to a particularly preferred embodiment of the invention, the homogenization is carried out by extruding the mixture in an extruder.
  • the mixture is preferably heated to a temperature of 90 to 200 0 C, in particular 120 to 180 0 C, more preferably 130 to 160 0 C, is heated.
  • the water content of the mixture is preferably adjusted during homogenization or extrusion.
  • thermoplastic starch contained in layer B is preferably characterized in that a film produced from the thermoplastic starch has a tensile strength according to DIN 53455 of 2 to 10 N / mm 2 , in particular from 4 to 8 N / mm 2 'and / or an elongation at break according to DIN 53455 from 80 to 200%, in particular from 120 to 180%.
  • thermoplastic starch is obtainable by: (a) mixing starch and / or a starch derivative with at least 15% by weight of a plasticizer such as glycerine and / or sorbitol, (b) supplying thermal and / or or mechanical energy and (c) at least partially removing the natural water content of the starch or starch derivative to a water content of less than 6% by weight.
  • a plasticizer such as glycerine and / or sorbitol
  • Layer B may contain other components in addition to thermoplastic starch.
  • layer B may contain conventional additives such as plasticizers, processing aids, stabilizers, antiflams and / or fillers as described above for layer A.
  • layer B may contain suitable processing aids, as described in more detail above in connection with layer A.
  • an adhesion promoter can be added, which can serve in particular to improve the adhesion between layer B and A. If the other components contained in layer B are polymeric materials, these are preferably not Thermoplastic and / or not biodegradable according to EN 13432.
  • layer B contains thermoplastic starch in an amount of at least 80 weight percent and most preferably at least 90 weight percent, at least 90.5 weight percent or at least 95 weight percent, based on the total weight of layer B. More preferably layer B consists essentially of thermoplastic starch, ie it is not a starch blend of starch and one or more other polymers, but only thermoplastic starch. According to a preferred embodiment of the invention, therefore, layer B contains, in addition to thermoplastic starch, no further biodegradable thermoplastic polymers according to EN 13432. According to a further preferred embodiment, layer B contains, in addition to thermoplastic starch, no further thermoplastic polymers.
  • both layer A and layer B consist essentially of thermoplastic polyester or of thermoplastic starch.
  • Multilayer film is a three-layer film of type A-B-A, wherein layer A consists of a polymer based on PHA (in particular PLA) and layer B consists of a polymer based on thermoplastic starch.
  • layer A consists of a polymer based on PHA (in particular PLA)
  • layer B consists of a polymer based on thermoplastic starch.
  • the production of the multilayer film according to the invention can be carried out by any desired production methods, for example calendering, extrusion or else by casting respectively.
  • Such preparation methods are generally known to the person skilled in the art and are described, for example, in J. Nentwig "Kunststoff-Folien", 2nd ed., Hanser Verlag, Berlin (2000), pages 39 to 63.
  • the multilayer films according to the invention are preferably formed by extrusion, in particular by blown film extrusion, flat film extrusion, cast film extrusion and / or blow molding. These production methods are generally known to the person skilled in the art. A detailed description of these methods of preparation can be found, for example, in J. Nentwig "Kunststoff-Folien", 2nd Ed., Hanser Verlag, Berlin (2000), pp. 45 to 60, which are expressly incorporated by reference and made the subject of the present disclosure becomes.
  • the preparation examples described therein can also be applied to the production of the multilayer film according to the invention. In this case, both individual and all layers of the film can be formed by extrusion. Preferably, all layers of the film are formed by extrusion.
  • the multilayer film according to the invention is formed by coextrusion.
  • coextrusion or multilayer extrusion processes are well known to those skilled in the art.
  • a description of the coextrusion process can be found, for example, in J. Nentwig "Kunststoff-Folien", 2nd Ed., Hanser Verlag, Berlin (2000), pp. 58 to 60, to which expressly incorporated and the subject of the present disclosure is done.
  • the ones described there Production examples are also transferable to the production of the multilayer film according to the invention.
  • the present invention further relates to a method for producing a multilayer film, wherein the multilayer film comprises at least one layer A, at least one layer B and optionally further layers, in particular optionally at least one further layer A, characterized by the following steps:
  • the individual process steps (a) to Cc) are preferably carried out simultaneously in the coextrusion process, in particular by blown film extrusion, flat film extrusion, cast film extrusion and / or blow molding.
  • the multilayer film can be cut into parts of the desired dimensions, depending on the intended use.
  • the cut-to-cut cut remnants can at least partially the material for the extrusion of layer B in step (b) are fed and thus serve as a recyclate.
  • the invention relates to a packaging for foodstuffs, in particular for fresh meat, cheese, fresh fruit or vegetables, baked goods, drinks and / or coffee, which comprises the multilayer film according to the invention.
  • the single figure shows an example of a sectional view of a multilayer film according to the invention with a layer structure of the type A-B-A.
  • a mixture of native potato starch (63% by weight), glycerin (23% by weight) and sorbitol (14% by weight) was charged to a twin-screw extruder.
  • the mixture was intensively mixed in the extruder in a temperature range of 130 to 16O 0 C, wherein the melt was simultaneously degassed to remove the mixture of water. This results in a homogeneous melt which can be withdrawn and granulated.
  • the water content of the homogenized in the manner described, melt processable mass is between 3 and 4 wt.%.
  • a three-layer film (A-B-A) consisting of polylactic acid (PLA) / thermoplastic starch (TPS) / PLA was prepared.
  • PLA polylactic acid
  • TPS thermoplastic starch
  • PLA granules, Nature Works had a D content of 1.4%.
  • the two materials were simultaneously driven to a three-layer film with a coextrusion line.
  • the TPS was melted in a single-screw extruder with an L / D ratio of 33 in a temperature range of 140 to 19O 0 C.
  • the extruder ran at a speed of 100 rpm and, at a throughput of 25 kg / h, produced a melt pressure of 130 bar.
  • the total thickness 400 .mu.m of the three-layer film thus produced was composed of 2 ⁇ 50 ⁇ m (outer layers A) and 300 ⁇ m (middle layer B).
  • a three-layer film ABA with PLA was produced as outer layer (A).
  • A a three-layer film ABA with PLA was produced as outer layer (A).
  • B a premix of the TPS granules prepared according to Example 1 (90% by weight) and PLA granules (10% by weight) was prepared, fed to the single-screw extruder and melted at 150 to 19O 0 C.
  • the extruder for the middle class was running at 100 rpm at a throughput of 25 kg / h and a melt pressure of 120 bar.
  • the total thickness 400 .mu.m of the three-layer film thus produced was composed of 2 ⁇ 50 ⁇ m (outer layers A) and 300 ⁇ m (middle layer B).
  • the three-layered film exhibited a more severe haze compared to Embodiment 2, but a more stable bond between the outer layers (A) and the middle layer (B) than that in Embodiment 2 was obtained.
  • a mixture of native potato starch (56.5 wt.%), Glycerol (20.5%), sorbitol (13%) and PLA (10%) was charged to a twin-screw extruder.
  • the mixture was in the extruder in a temperature range of 130 to 16O 0 C intensively mixed, wherein the melt was simultaneously degassed to remove the mixture of water. Similar to Embodiment 1, a homogeneous melt is formed which can be withdrawn and granulated.
  • the water content of the homogenized in the manner described, melt processable mass is between 3 and 4% by weight.
  • thermoplastically processable starch / PLA compound described in Example 4 was fed to the extruder and melted at 140 to 195 ° C.
  • the extruder for the middle layer ran at 90 rpm at a throughput of 25 kg / h and a pressure of 115 bar.
  • the total thickness 400 ⁇ m of the three-layer film thus produced was composed of 2 ⁇ 50 ⁇ m (outer layers A) and 300 ⁇ m (middle layer B).
  • the three-layered film showed more haze in comparison with the patterns made in Embodiments 2 and 3, but a more stable bond between the outer layers A and the middle layer B was obtained in comparison with Embodiments 2 and 3.
  • the polylactic acid (PLA) for the outer layer became an ethylene / methyl acrylate polymer functionalized with about 3% by weight of maleic anhydride in an amount of about 1% by weight, based on
  • a three-layer film (blown film) A three-layer film (ABA) consisting of polylactic acid (PLA) / thermoplastic starch (TPS) / PLA was produced.
  • PLA polylactic acid
  • TPS thermoplastic starch
  • PLA polylactic acid
  • TPS thermoplastic starch
  • PLA granules, Nature Works had a D content of 1.4%.
  • the two materials were simultaneously driven to a three-layer film with a coextrusion line.
  • the TPS was melted in a single-screw extruder (Dr. Collin 0 45 ⁇ 25 D) in a temperature range from 140 to 160 ° C.
  • the extruder ran at a speed of 20 rpm and, at a throughput of about 7 kg / h, produced a melt pressure of 130 bar.
  • a second single-shaft extruder Dr. Collin 0 30 x 25 D, temperature 160-190 0 C, speed 60 rev / min, melt pressure 140 bar, throughput 15 kg / h was melted PLA.
  • Example 7 As in Example 7, however, to the outer layer, an ethylene / methyl acrylate polymer functionalized with about 3 weight percent maleic anhydride in an amount of about 1 weight percent, based on the total composition of the PLA layer, was added to the polylactic acid (PLA) , The three-layer film thus obtained had an increased interconnection between the individual layers compared to the product described in Example 7.
  • PVA polylactic acid
  • the polylactic acid (PLA) for the outer layer was additionally added 5 wt.%, Based on the total composition of the PLA layer, of aliphatic / aromatic copolyester (ECOFLEX® from BASF AG). The system thus obtained had a better processability compared to the formulation according to Example 13.

Abstract

La présente invention concerne une feuille multicouche, en particulier à des fins d'emballage, qui comprend au moins une première couche A et au moins une deuxième couche B. La couche A contient du polyester thermoplastique et la couche B de l'amidon thermoplastique, et la couche B ne contient en plus de l'amidon thermoplastique aucun autre polymère thermoplastique biodégradable. La feuille multicouche selon l'invention se caractérise par des propriétés d'écran excellentes, une faible sensibilité à l'humidité ainsi que par une bonne solidité mécanique.
PCT/EP2007/060984 2007-10-15 2007-10-15 Feuille multicouche et son procédé de fabrication WO2009049667A1 (fr)

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ITMI20081491A1 (it) * 2008-08-07 2010-02-08 Sipa Ind Srl Pellicola multistrato in materiale biodegradabile e processo per la produzione di tale pellicola
FR2959495A1 (fr) * 2010-04-30 2011-11-04 Gascogne Sack Film pour sac biodegradable et/ou compostable, et sac correspondant
WO2016079244A1 (fr) * 2014-11-19 2016-05-26 Bio-Tec Biologische Naturverpackungen Gmbh & Co. Kg Film multicouches biodégradable
FR3082143A1 (fr) * 2018-06-11 2019-12-13 Carbiolice Film multicouche transparent
CN113698637A (zh) * 2021-08-11 2021-11-26 兰州鑫银环橡塑制品有限公司 一种烟草种植用全生物降解地膜材料及其制备方法

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Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ITMI20081491A1 (it) * 2008-08-07 2010-02-08 Sipa Ind Srl Pellicola multistrato in materiale biodegradabile e processo per la produzione di tale pellicola
FR2959495A1 (fr) * 2010-04-30 2011-11-04 Gascogne Sack Film pour sac biodegradable et/ou compostable, et sac correspondant
WO2016079244A1 (fr) * 2014-11-19 2016-05-26 Bio-Tec Biologische Naturverpackungen Gmbh & Co. Kg Film multicouches biodégradable
JP2018504292A (ja) * 2014-11-19 2018-02-15 バイオ−テック ビオローギッシュ ナチューフェアパックンゲン ゲーエムベーハー ウント コンパニ カーゲー 生分解性多層フィルム
US11358378B2 (en) 2014-11-19 2022-06-14 Bio-Tec Biologische Naturverpackungen Gmbh & Co. Kg. Biodegradable multi-layer film
FR3082143A1 (fr) * 2018-06-11 2019-12-13 Carbiolice Film multicouche transparent
CN113698637A (zh) * 2021-08-11 2021-11-26 兰州鑫银环橡塑制品有限公司 一种烟草种植用全生物降解地膜材料及其制备方法
CN113698637B (zh) * 2021-08-11 2023-08-22 兰州鑫银环橡塑制品有限公司 一种烟草种植用全生物降解地膜材料及其制备方法

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