WO2008003471A1 - Mehrschichtfolie - Google Patents
Mehrschichtfolie Download PDFInfo
- Publication number
- WO2008003471A1 WO2008003471A1 PCT/EP2007/005896 EP2007005896W WO2008003471A1 WO 2008003471 A1 WO2008003471 A1 WO 2008003471A1 EP 2007005896 W EP2007005896 W EP 2007005896W WO 2008003471 A1 WO2008003471 A1 WO 2008003471A1
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- WO
- WIPO (PCT)
- Prior art keywords
- layer
- multilayer film
- film according
- ethylene
- copolymer
- Prior art date
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Classifications
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- 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
- B32B7/027—Thermal properties
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- 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
-
- 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
- B32B38/00—Ancillary operations in connection with laminating processes
- B32B38/0012—Mechanical treatment, e.g. roughening, deforming, stretching
- B32B2038/0028—Stretching, elongating
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- 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
- B32B2307/514—Oriented
- B32B2307/516—Oriented mono-axially
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- 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
- B32B2323/00—Polyalkenes
- B32B2323/04—Polyethylene
-
- 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
- B32B2323/00—Polyalkenes
- B32B2323/10—Polypropylene
-
- 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
- B32B2367/00—Polyesters, e.g. PET, i.e. polyethylene terephthalate
-
- 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
- B32B2377/00—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
- B32B2439/00—Containers; Receptacles
- B32B2439/70—Food packaging
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/13—Hollow or container type article [e.g., tube, vase, etc.]
- Y10T428/1334—Nonself-supporting tubular film or bag [e.g., pouch, envelope, packet, etc.]
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/24—Structurally defined web or sheet [e.g., overall dimension, etc.]
- Y10T428/24942—Structurally defined web or sheet [e.g., overall dimension, etc.] including components having same physical characteristic in differing degree
- Y10T428/2495—Thickness [relative or absolute]
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/26—Web or sheet containing structurally defined element or component, the element or component having a specified physical dimension
- Y10T428/263—Coating layer not in excess of 5 mils thick or equivalent
- Y10T428/264—Up to 3 mils
Definitions
- the invention relates to a multilayer film, which is particularly suitable for the production of food packaging. Furthermore, the invention relates to a method for producing such a multilayer film.
- Multilayer composites of oriented films are well suited for use as packaging materials for sensitive products. It is desirable for various reasons that the composites are printed, metallized and / or coated with a (semi-) metal oxide. For example, information can be conveyed by means of printed images, areas metallised or coated with (HalB) metal oxides contribute to the barrier effect against moisture, gases and aromas and can also have aesthetic advantages.
- the printed, metallised or (half) metal oxide coated area In order to protect the printed, metallised or (half) metal oxide coated area from external mechanical influences, it should preferably be located on the inside, i. be arranged between at least two layers of the composite.
- multilayer films with an inner printed, metallized or (semi-) metal oxide coated region can not be produced in a single process step using conventional processes.
- Such composites are usually prepared by a multi-stage process, wherein initially two films are produced independently, of which at least one film is printed on its outer surface, metallized or coated with a (semi-) metal oxide. Subsequently, both films are connected by means of suitable laminating adhesives to form a multilayer film such that the printed, metallized or coated with a (half) metal oxide region between the two films is arranged. If at least one of the two films is transparent, then the printed, metallized or coated with a (half) metal oxide region can be viewed from the outside.
- the laminating adhesives provide a satisfactory bond between the films. At the time of application, they allow wetting of the surface of the films, in particular of the printed, metallized or coated with the (semi-) metal oxide area, and harden in the adhesive joint.
- laminating adhesives have u.a. the disadvantage that they have to cure, which usually takes several days, sometimes up to two weeks, so that the composite can not immediately be processed as packaging material. Furthermore, the recyclability of composite films containing cured laminating adhesives is severely limited.
- laminating adhesives can have the disadvantage that they store color pigments.
- the pigments contained in the spice can diffuse through the individual layers of the package with time and finally reach the laminating adhesive, where they store. This leads u.a. for the packaging to appear spotted on the outside.
- multilayer films containing laminating adhesives are only partially suitable for packaging perishable foods.
- cured laminating adhesives usually contain residues of substances capable of migrating, which are harmful or even toxic and can diffuse out of the packaging into the food. Examples of such migratory substances are certain isocyanates and certain primary amines, which are typical constituents of laminating adhesives.
- BD Page et al. Food Addit Contam. 1992, 9 (3), 197-212; TP McNeal et al., J. AOAC Int. 1993, 76 (6), 1268-75; M. Sharman et al., Food Addit Contam.
- laminating adhesives were developed whose content of migratory, hazardous substances after curing is lower than with conventional laminating adhesives.
- these laminating adhesives are not satisfactory in every respect.
- they are on the one hand comparatively expensive, on the other hand, the composite adhesion - depending on the material properties of the films to be joined - does not always meet the requirements imposed on the packaging material and they usually have longer curing times.
- multilayer films have been developed which have a barrier layer which prevents the migratory components from reaching the package.
- barrier layers For the production of such barrier layers, however, special materials must be used, whereby the production of the multilayer films is comparatively complicated and expensive.
- EP-A 1 167 017 discloses a process in which polyethylene (PE) is melted in an extruder and applied between two BOPP films (extrusion lamination), one of which is printed on a BOPP film and the other is metallised.
- the BOPP films are bonded together by curing the polyethylene so that the metallized side and the ink are inside.
- the extrusion lamination permits the avoidance of laminating adhesives, it has the disadvantage that the polymer is extruded onto a comparative Wise high temperature must be heated so that usually increased demands on the temperature resistance of printing inks and metallized films must be made and special measures are required to prevent curling of the resulting composite. Further, the high temperature of the extruded polymer melt requires that the film to be coated have sufficient temperature resistance. Thus, the polymer melt whose temperature, depending on the polymer in the range of 300 0 C, must not damage the film to be coated. BOPP in particular is endangered here because it has a comparatively low melting point at approx. 164 ° C. Furthermore, printed and / or vacuum-metallized films are at risk because the hot melt is applied in direct contact.
- the extruded layer has a certain minimum layer thickness, which is accompanied by an increased use of materials.
- the extrusion lamination has the disadvantage that the composite adhesion between the extruded layer and the two layers connected by it is relatively small. In most cases the adhesion is below 1, 0 N / 15 mm.
- US 6,368,722 discloses laminated multilayer films prepared by preparing a heat-resistant polymer in a dipolar aprotic solvent, e.g. N-methyl-2-pyrrolidone is dissolved. The solution is then applied to an oriented film and dried at elevated temperature.
- a dipolar aprotic solvent e.g. N-methyl-2-pyrrolidone
- the object of the invention is to provide multilayer films with an inner printed, metallized and / or (semi-) metal oxide coated region, which have advantages over the multilayer films of the prior art.
- the multilayer films should be suitable as packaging materials for perishable food, can be produced inexpensively and have a good adhesion between the layers in the printed, metallized or coated with a (semi) metal oxide area.
- the multilayer films should manage without migratable, health-endangering substances to comply with the technical requirements, in particular high barrier properties to water vapor and oxygen, and be competitive in manufacturing costs with conventional multilayer films. Furthermore, they should be able to be used as packaging materials as soon as possible after their production, i. longer cooling or curing periods should be avoided. In the most favorable case, only periods of less than one hour, preferably less than 10 minutes, should lie between the production of the multilayer film and its suitability for use on a packaging machine.
- multilayer films can be produced from two independently produced films, of which at least one film has on one of its outer surfaces a printed, metallized and / or coated with a (semi-) metal oxide region D, wherein excellent bond adhesion values can be achieved without the use of laminating adhesives is required.
- the multilayer films of the invention have excellent sensory properties, i. are e.g. superior to many conventional multilayer films in terms of preserving the odor and taste of the packaged product.
- the invention relates to a multilayer film comprising
- Layer A which is based on a thermoplastic polymer or a mixture of several thermoplastic polymers having a melting temperature T m A and a VICAT softening temperature T V A and a layer thickness of at most 40 ⁇ m, preferably at most 35 ⁇ m, more preferably at most 30 ⁇ m, even more preferably at most 25 ⁇ m, most preferably at most 20 ⁇ m and in particular at most 15 ⁇ m; and
- Layer B which is directly adjacent to layer A, is based on a thermoplastic polymer or a mixture of several thermoplastic polymers having a melting temperature T m B and a VICAT softening temperature T V B and a layer thickness of at most 50 ⁇ m, preferably at most 40 ⁇ m, more preferably at most 30 ⁇ m, more preferably at most 20 ⁇ m, most preferably at most 15 ⁇ m and in particular at most 10 ⁇ m;
- T V B ⁇ T V A and T m B ⁇ T m A preferably T V B ⁇ T V A ⁇ T m B ⁇ T m A or T V B ⁇ T m B ⁇ TA v ⁇ ⁇ A.
- the multilayer film comprises an outer sealant layer; between layer A and layer B a printed and / or metallized and / or coated with a (half) metal oxide region D is arranged; and
- the bond between layer A and layer B is at least 1.0 N / 15 mm, preferably at least 1.5 N / 15 mm, at least 2.0 N / 15 mm or at least 2.5 N / 15 mm, more preferably at least 3.0 N / 15 mm, at least 3.5 N / 15 mm or at least 4.0 N / 15 mm, more preferably at least 4.5 N / 15 mm, at least 5.0 N / 15 mm or at least 5.5 N / 15 mm, most preferably at least 6.0 N / 15 mm, at least 6.5 N / 15 mm or at least 7.0 N / 15 mm and especially at least 7.5 N / 15 mm, at least 8.0 N / 15 mm or at least 8.5 N / 15 mm, preferably determined according to DIN 53 357 method B.
- FIG. 1 and 2 show a template, which is preferably used to determine the curl of the multilayer film according to the invention.
- FIG. 3 shows schematically the curl tendency of a multilayer film in the transverse direction (left) and in the longitudinal direction (right) to the film web.
- the multilayer films according to the invention are particularly suitable for packaging perishable foods, since contamination of the packaged goods by migration-capable substances can be largely excluded.
- the multilayer film according to the invention has, between layer A and layer B, a printed and / or metallized area D and / or area D coated with a (semi-) metal oxide. This is expressed below by the notation "ADB". Since region D is not to be regarded as an independent layer of the multilayer film, layer A directly adjoins layer B, ie there is no further layer between layer A and layer B.
- the area D may cover the entire main extension plane (area) of the multilayer film or only a part thereof.
- the region D covers the entire main plane of extension of the multilayer film. This embodiment is particularly preferred when the region D is a metallized and / or coated with a (HaIb -) metal oxide region.
- region D covers less than the entire major plane of extent of the multilayer film, preferably less than 95%, more preferably less than 90%, even more preferably less than 85%, most preferably less than 80% and most preferably less than 50%.
- area D may be contiguous or divided into several subregions. This embodiment is particularly preferred when the region D is a printed and / or metallized region.
- the region D is a metallized region which covers less than the entire main extension plane of the multilayer film, it is preferably a demetallized region, i. During production, the metallized area initially covered the entire main extension plane of the multilayer film, but partial removal of the metal film (demetallization) subsequently created areas which are not (anymore) metallized. Suitable processes for demetallization are known to the person skilled in the art. For example, the demetallization can be realized by means of etching techniques.
- the area D is a printed area, it may include symbols or letters.
- the distance of the curled edges of a cross-section is used as a measure of the curl (film curl) of the multilayer film according to the invention.
- the multilayer film according to the invention preferably has a curl of at most 50 mm in the longitudinal and / or transverse direction, more preferably at most 40 mm, even more preferably at most 30 mm, most preferably at most 20 mm and in particular at most 10 mm. Suitable methods for determining the curl of multilayer films are known to those skilled in the art. According to the invention, the tendency to curl is determined by the so-called cross-cut method. This is described in more detail in the experimental part.
- the curl can be determined for example by the so-called. Ronde method. If the radius of curvature is used as a measure of the curl, the determination is preferably carried out according to US Pat. No. 4,565,738.
- the curling tendency is preferably at most 60 °, more preferably at most 50 °, even more preferably at most 40 °, most preferably at most 30 ° and in particular at most 20 °.
- Layer A and layer B of the multilayer film according to the invention are each independently based on a thermoplastic polymer or a mixture of a plurality of thermoplastic polymers having a melting temperature T m A and T m B and a VICAT softening temperature T V A and T 1 V V B.
- the melting temperature of the polymer is preferably determined by DSC according to DIN ISO 11357 or ISO 3146 / ASTM D3418.
- the mixture is preferably investigated in accordance with DIN ISO 11357 or ISO 3146 / ASTM D3418 and the temperature to be assigned to the main peak in the DSC is, in the context of the invention, the melting temperature of the polymer mixture.
- layer A and layer B are each based neither on a laminating adhesive nor on a lacquer.
- the multilayer film according to the invention comprises no laminating adhesive and / or lacquer at all.
- Laminating adhesives are known to a person skilled in the art.
- a "laminating adhesive 1" in the sense of the description is preferably defined as a product which due to its chemical composition and its physical state at the time of application between two layers to be joined wetting of the surface and in the adhesive joint due to physical processes (eg evaporation more volatile Solvent) and / or chemical reactions (eg formation of covalent bonds) cures.
- a "laminating adhesive” in the sense of the description is preferably a chemically reacting adhesive which may be cold or thermosetting and includes polymerization, polyaddition and polycondensation adhesives
- Examples of one-component polymerization adhesives are cyanoacrylate adhesives (cyanoacrylates) and Examples of polyaddition adhesives are epoxy resin adhesives and polyurethane adhesives
- Examples of polycondensation adhesives include formaldehyde condensates, certain polyamides, certain polyesters, silicones, polyimides, polybenzimidazoles and polysulfones, these being Usually not used or only in exceptional cases as laminating adhesives.
- a “paint” in the sense of the description is preferably defined as a liquid which forms a solid, stable, usually glossy layer after drying and thus protects the surface provided therewith and optionally decorates. It is preferably a product which due to its chemical composition and its physical state at the time of application on a layer wetting of the surface allows and due to physical processes (eg evaporation of volatile solvents) and / or chemical reactions (eg formation of covalent bonds ) hardens.
- the multi-layer film according to the invention preferably contains - in addition to the possibly existing printing inks in the printed area D - no lacquer.
- the multilayer film according to the invention particularly preferably contains, in addition to the printing inks, no further substance or composition which, due to chemical processes and / or by evaporation of a solvent, is used in the production of the multilayer film. was hardened. This has the advantage, inter alia, that the multilayer film according to the invention is better recyclable and suitable for the packaging of foods.
- the multilayer film according to the invention comprises eight, seven, six, five, four, three or only two layers.
- the multilayer film consists of layer A and layer B, so that at least layer A or layer B is at least monoaxially stretched and at least layer A or layer B forms an outer sealing layer of the multilayer film.
- the multilayer film according to the invention has a total layer thickness of at most 200 ⁇ m, at most 190 ⁇ m or at most 180 ⁇ m; more preferably at most 170 ⁇ m, at most 160 ⁇ m or at most 150 ⁇ m; even more preferably at most 140 ⁇ m, at most 130 ⁇ m or at most 120 ⁇ m; most preferably at most 110 ⁇ m, at most 100 ⁇ m or at most 90 ⁇ m; and in particular at most 80 ⁇ m, at most 70 ⁇ m or at most 60 ⁇ m.
- the multilayer film according to the invention is preferably not thermoformable, in particular not deep drawable.
- Layer A and / or layer B of the film according to the invention is preferably transparent.
- a "transparent layer” in the sense of the invention is characterized in that a packaged product can be viewed through this layer with the naked eye.
- the transparency is preferably quantified with the aid of densitometers. Such methods are familiar to the person skilled in the art.
- the turbidity can be measured as an optical value.
- the turbidity is preferably measured according to the ASTM test standard D 1003-61 m, Procedure A, after calibration of the measuring instrument with turbidity standards between 0.3 and 34% haze.
- a Byk-Gardner Hazemeter with Ulbricht sphere which allows integrated measurement of the diffuse light transmittances at a solid angle of 8 ° to 160 °, is suitable as a measuring instrument.
- the individual layers of the multilayer film of the invention when unprinted preferably have a haze determined by the method described above of less than 14%, more preferably less than 12%, even more preferably less than 10%, most preferably less than 8% and especially less than 6%. on.
- the multilayer film as such has a haze of less than 30%, more preferably less than 25%, even more preferably less than 20%, most preferably less than 15% and in particular less than 10%, at least in optionally unprinted areas.
- all layers optionally on the side of layer A, including layer A have a total haze of less than 30%, more preferably less than 28%, even more preferably less than 26%, most preferably less than 24% and especially less than 22%.
- all layers possibly including the layer B side, including layer B have an overall haze of less than 30%, more preferably less than 28%, even more preferably less than 26% most preferably less than 24% and in particular less than 22%.
- the multilayer film according to the invention comprises at least one at least monoaxially, preferably biaxially oriented layer. This may be layer A, layer B or a possibly existing layer other than layer A and layer B.
- the orientation of polymers by stretching a film is familiar to the person skilled in the art. If thermoplastic polymers are stretched at temperatures at which the molecules can still slide along one another, but the relaxation times are much greater than the time during which they are kept at elevated temperature for the drawing process, the orientation achieved in the course of stretching remains. ie the orientation of the polymer strands in the direction of stretching.
- the stretching results in significant property changes in both amorphous and partially crystalline thermoplastic polymers. mers.
- a biaxial stretching preferably takes place in the machine direction and transversely thereto, wherein the stretching can take place simultaneously or sequentially.
- the area stretching ratio is preferably in the range of 5 to 60, more preferably 7 to 55, still more preferably 9 to 50, and especially 9 ⁇ 2, 20 ⁇ 5 or 50 ⁇ 10.
- layer A and / or layer B forms a surface of the multilayer film according to the invention.
- the total layer thickness is independent of each other
- Layer A of the multilayer film according to the invention is based on a polymer or a polymer mixture having a melting temperature T m A.
- T m A melting temperature
- the melt flow index of the polymers or of the mixture of the polymers on which layer A is based is preferably in the range from 0.3 to 9.5 g / 10 min; more preferably 3.5 ⁇ 2.0 g / 10 min, 5.5 ⁇ 2.0 g / 10 min or 7.5 ⁇ 2.0 g / 10 min; more preferably 3.0 ⁇ 1.5 g / 10 min, 4.0 ⁇ 1.5 g / 10 min, 5.0 ⁇ 1.5 g / 10 min, 6.0 ⁇ 1.5 g / 10 min, 7.0 ⁇ 1.5 g / 10 min or 8.0 ⁇ 1.5 g / 10 min; most preferably 2.5 ⁇ 1, 0 g / 10 min, 3.5 ⁇ 1, 0 g / 10 min, 4.5 ⁇ 1, 0 g / 10 min, 5.5 ⁇ 1, 0 g / 10 min, 6.5 ⁇ 1, 0 g / 10 min, 7.5
- the viscosity number of the polymers or of the mixture of the polymers on which layer A is based is preferably in the range of 190 ⁇ 75 ml / g, more preferably 190 ⁇ 50 ml / g, more preferably 190 ⁇ 30 and especially 190 ⁇ 10 g / ml.
- the intrinsic viscosity of the polymers or the mixture of polymers on which layer A is based is preferably in the range of 0.8 ⁇ 0.3 dl / g, more preferably 0.8 ⁇ 0.2 dl / g and in particular 0.8 ⁇ 0.1 dl / g.
- the density p A of the polymers or the mixture of the polymers on which layer A is based is in the range of> 1.00 g cm -3 , more preferably> 1.10 g cm “3 , more preferably ⁇ 1.15 g cm “ 3 , most preferably ⁇ 1.20 g cm "3, and in particular ⁇ 1.25 g cm- 3 .
- the density ⁇ A of the polymers is Mixture of the polymers on which layer A is based (ISO 1183 / ASTM D792), in the range of ⁇ 1, 00 g cm “3 , more preferably ⁇ 0.98 g cm '3 , even more preferably ⁇ 0.96 g cm " 3 , most preferably ⁇ 0.94 g cm -3 and in particular ⁇ 0.92 g cm -3 .
- Layer A is preferably based on at least one polymer selected from the group consisting of (co) polyolefins, (co) polyesters, (co) polycarbonates and (co) polyamides.
- the term “(co) polyolefin” includes both polyolefins and copolyolefins.
- the term “(co) polyester” includes both polyesters and copolyesters
- the term “(co) polycarbonates” includes both polyacrolates and copolycarbonates
- (co) polyamides” includes both polyamides and copolyamides ,
- Preferred (co) polyolefins according to the invention are selected from the group consisting of PE (in particular LDPE 1 LLDPE, HDPE or mPE), PP, PI 1 PB, EAA, EMAA 1 EVA, EPC, PMMA, I 1 PS, SEP 1 SEPS, SEBS, SEEPS and thermoplastic elastomers or their copolymers.
- PE polyethylene
- PP polypropylene
- LDPE low density polyethylene which has a density in the range of 0.86-0.93 g / cm 3 and is characterized by a high degree of branching of the molecules.
- a sub-form of LDPE forms linear low-density polyethylene (LLDPE), which in addition to ethylene as comonomer one or more ⁇ -olefins having more than 3 carbon atoms, for example, but-1-ene, hex-1-ene, 4-methyl-pentene 1-en and Oct-1-ene.
- LLDPE linear low-density polyethylene
- the copolymerization of the monomers mentioned gives the typical LLDPE molecular structure, which is characterized by a linear main chain with side chains located thereon. The density varies between 0.86 and 0.94 g / cm 3 .
- the melt flow index MFR of polyethylene-based polymers is preferably between 0.3 and 15 g / 10 min (at 190 ° C / 2.16 kg load, measured according to DIN EN ISO 1133).
- the melt flow index MFR of polypropylene-based polymers is preferably between 0.3 and 30 g / 10 min (at 230 ° C / 2.16 kg load, measured according to DIN EN ISO 1133).
- HDPE high density polyethylene which has little branching of the molecular chain, the density may range between 0.94 and 0.97 g / cm 3 .
- mPE is meant an ethylene copolymer which has been polymerized by means of metallocene catalysts.
- an ⁇ -olefin having 4 or more carbon atoms is preferably used as the comonomer.
- the density is preferably between 0.88 and 0.93 g / cm 3 .
- the dispersity M w / M n is preferably less than 3.5, preferably less than 3.0.
- PI polyisobutylene
- PB polybutylene
- EAA denotes copolymers of ethylene and acrylic acid
- EEMAA copolymers of ethylene and methacrylic acid.
- the ethylene content is in each case preferably between 60 and 99 mol%.
- EVA is meant a copolymer of ethylene and vinyl acetate.
- the ethylene content is preferably between 60 and 99 mol .-%.
- EPC ethylene-propylene copolymers with 1-10 mol .-% of ethylene, wherein the ethylene is randomly distributed in the molecule.
- PMMA polymethylmethacrylate and its copolymers.
- I refers to olefins based copolymers whose molecules are crosslinked via ionic bonds (ionomers).
- the ionic bond is reversible, which causes a dissolution of the ionic bond at ordinary processing temperatures (about 180-290 0 C) and a reformation of the ionic bond in the cooling phase.
- copolymers of ethylene polymers as employed with acrylic acids, which are crosslinked by sodium or zinc ions such as Surlyn ®
- PS refers to polystyrenes and styrene copolymers.
- An examples of a styrene copolymer is styrene-butadiene copolymer, for example, Styroflex ®.
- SEP is hydrogenated polyC-styrene-b-isoprene J-block copolymers, "SEPS” hydrogenated polyC-styrene-b-isoprene-b-StyroO-block copolymers, "SEBS” hydrogenated polyC-styrene-b-butadiene-b-styrene.
- thermoplastic elastomers are styrene-vinyl-polyisoprene (block -) - copolymers, for example HYBRAR ®. They include blocks of polystyrene, vinyl-polyisoprene, polyisoprene, hydrogenated vinyl-polyisoprene and hydrogenated polyisoprene.
- Preferred (co) polyesters according to the invention are selected from the group consisting of PET (in particular c-PET or a-PET), CoPET 1 PBT and CoPBT.
- PET polyethylene terephthalate, which can be prepared from ethylene glycol and terephthalic acid.
- a-PET amorphous PET
- c-PET crystalline PET
- CoPET refers to copolyesters which, in addition to ethylene glycol and terephthalic acid, also contain other monomers, such as, for example, branched or aromatic diol glycols.
- PBT refers to polybutylene terephthalate and "CoPBT” to a copolyester of polybutylene terephthalate.
- PBT can be prepared from butane-1, 4-diol and terephthalic acid. be presented.
- the polyester or copolyester has an intrinsic viscosity of from 0.1 to 2.0 dl / g, more preferably from 0.2 to 1.7 dl / g, even more preferably from 0.3 to 1.5 dl / g, most preferably 0, 4 to 1, 2 dl / g and in particular 0.6 to 1, 0 dl / g. Methods for determining the intrinsic viscosity are known to the person skilled in the art.
- PET polycarbonates
- PC polycarbonates
- CoPC copolycarbonates
- Preferred (co) polyamides according to the invention are aliphatic or (partially) aromatic.
- the polyamide is aliphatic.
- the polyamide or copolyamide has a melting point in the range of 160 to 240 0 C, more preferably 170 to 222 ° C.
- the polyamide or copolyamide is preferably selected from the group consisting of PA 4, PA 6, PA 7, PA 8, PA 9, PA 10, PA 11, PA 12, PA 4,2, PA 4,6, PA 6,6 , PA 6.8, PA 6.9, PA 6.10, PA 6.12, PA 7.7, PA 8.8, PA 9.9, PA 10.9, PA 12.12, PA 6/6 , 6, PA 6,6 / 6, PA 6,2 / 6,2, and PA 6,6 / 6,9 / 6.
- PA 6 is particularly preferred.
- a detailed description of PA and CoPA can be found in Kunststoff-Handbuch Volume VI, Polyamides, Carl Hanser Verlag Kunststoff, 1966; and Melvin I. Kohan, Nylon Plastics Handbook, Carl Hanser Verlag Kunststoff, 1995, the contents of which are fully incorporated by reference.
- the multilayer film of the invention has an outer sealant layer.
- This may be layer A, layer B or a possibly existing layer other than layer A and layer B.
- the sealing layer is a layer other than layer A and layer B.
- the notation "S // ADB” represents a multilayer film in which the sealant layer S is disposed on the side of the layer A, which layer B faces away.
- "//” does not necessarily mean that the sealing layer S touches the layer A. Rather, it is also possible that one or more intermediate layers are arranged between the sealing layer S and the layer A.
- the sealing layer can also be identical to layer A or layer B.
- the sealing layer of the multilayer film according to the invention is sealable, preferably heat-sealable.
- the sealing layer is primarily used for welding the film.
- the sealing medium In tubular bag packaging, the sealing medium must be able to be sealed against itself, in packaging from the lid and lower shell, the sealing medium must be sealed against another sealing film.
- the sealing process is described, for example, in Hernandez / Selke / Culter: Plastics Packaging, Carl Hanser Verlag, Kunststoff, 2000.
- the sealing layer may be peelable.
- the sealing layer is preferably based on at least one (co) -polyolefin.
- the polymers used to make the sealant layer are allowed to make layers that come in contact with food.
- the sealant layer is based on at least one polyolefin selected from the group consisting of mPE, HDPE, LDPE, LLDPE, EVA, EAA, I (preferably Surlyn ®, for example with zinc ions), PP, preferably homo-PP, and propylene Copolymerizat, or their mixture.
- the sealing temperatures are preferably in the range of 100 0 C to 164 ° C.
- the melting temperature of the sealing layer is preferably from 90 0 C to 164 ° C, more preferably 95 ° C to 13O 0 C.
- the sealant layer may be provided with conventional excipients such as antistatic agents, lubricants, slip agents, antiblocking agents, antifogging agents and / or spacers.
- a printed region D is arranged between layer A and layer B.
- layer B may be printed on the side A facing the layer A and / or layer A on the side facing the layer B.
- the printed area is preferably based on conventional printing inks.
- Print inks in the sense of the description are preferably colored liquids or pastes with which a print carrier or a printing form can transfer a printed image, ie a print, reproducibly onto a substrate, ie onto at least one layer of the multilayer film according to the invention.
- Printing inks usually consist of binders, colorants (pigments, dyes), solvents and additives.
- the binders usually serve two purposes - on the one hand they wet and envelop the coloring component and transfer it to the substrate via the inking unit and the printing form - on the other hand they fix the pigments on the substrate and produce a resistant print.
- Typical binders are: a) semisynthetic polymers (modified natural products), for example cellulose derivatives such as nitrocellulose, ethylcellulose, cellulose acetate propionate or butyrate; and b) Fully synthetic polymers: petroleum based products, polyvinyl butyral resins (PVB), polyvinyl chloride copolymers (based on PVC), polyacrylates, polyamides, polyurethanes (PUR).
- Colorants include all colorants, such as pigments, dyes and pigment preparations. Dyes are soluble substances in the application medium, pigments are practically insoluble in the application medium.
- the application medium is composed of binder and solvent and optionally conventional additives.
- Typical solvents are organic, e.g. Ethanol, ethyl acetate, acetone, propanol, methyl ethyl ketone, etc.
- Additives modify the property profile of the ink, e.g. the adhesion, the elasticity and the sliding properties.
- solventless inks that generally cure by radiation-induced crosslinking (e.g., UV rays or electron beams).
- a metallized region D is arranged between layer A and layer B.
- layer B may be metallized on the side A facing the layer A and / or layer A on the side facing the layer B, wherein the metallization may be over the whole area or possibly cover only a part of the main extension plane of the multilayer film.
- Metallization processes are known to the person skilled in the art.
- a polymer layer is vacuum-coated with a metal, for example with aluminum.
- the metal settles on the polymer, forming a thin film.
- a prefabricated polymer film may be placed in a vacuum chamber and a vacuum in the range of 10 "4 to 10 '5 bar may be generated by suitable pumps
- the metal, for example aluminum is then heated to a temperature in the range of 1400 to 1500 ° C
- a very thin layer of metal deposits on the surface of the polymer film, preferentially metallizing the entire surface of the polymer film: temperature, vacuum, geometry of the vacuum chamber and the speed of the polymer film through the metal vapor can be varied, whereby the thickness of the metal film can be adjusted
- the thickness of the metal film can be measured both electrically and optically.
- a region D coated with a (semi-) metal oxide is arranged between layer A and layer B.
- (Hal) metal oxide includes both half metal oxides (eg SiO x ) and metal oxides (eg AlO x ).
- layer B on the side A facing the layer A and / or layer A on the side facing the layer B may be coated with a (semi-) metal oxide.
- the (semi-) metal oxide is preferably AIO x or SiO x .
- the coating can be carried out, for example, by chemical vapor deposition (CVD) or physical vapor deposition (PVD). Such methods are known to the person skilled in the art. For example, it is possible to evaporate aluminum in vacuo and deposit by metering a certain amount of oxygen AIO x . In the case of silicon, the evaporation can take place with the aid of an electron beam. For further details, reference may be made, for example, fully to US 5,728,224.
- the region D of the multilayer film according to the invention can be treated on one side with a primer.
- Primers are substances which are applied as a comparatively thin film, usually less than 0.05 ⁇ m, and modify the surface properties of the substrate. They differ, inter alia, in the thickness of their order of laminating adhesives, which are usually applied because of their viscosity in thicknesses of more than 0.5 microns.
- a primer can be defined as a surface coating that aids adhesion to a substrate. Primers may have reactive functional groups that can react with functional groups of the polymers. A possibly present primer is not to be regarded as an independent layer, so that in this case as well layer A directly adjoins layer B, ie there is no further layer between layer A and layer B.
- layer B has a layer thickness of at most 50%, more preferably at most 40%, even more preferably at most 30%, most preferably at most 20%, and most preferably at most 10% of the total layer thickness of layer B and all on the side of layer B 1
- Layer A is remote, arranged on layers. For example, if the multilayer film has the structure ADB // C, the layer thickness of the layer B is at most the percentage of the sum of the layer B and the layer C mentioned above.
- layer B is based on a polymer or polymer blend having a melt flow index MFI B (ISO 1133 / ASTM D1238, 2.16 kg / 10 min) in the range of 0.3 to 6.0 g / 10 min; more preferably 2.5 ⁇ 1, 0 g / 10 min, 3.5 ⁇ 1, 0 g / 10 min or 4.5 ⁇ 1, 0 g / 10 min; more preferably 1, 5 ⁇ 0.5 g / 10 min, 2.0 ⁇ 0.5 g / 10 min, 2.5 ⁇ 0.5 g / 10 min, 3.0 ⁇ 0.5 g / 10 min, 3.5 ⁇ 0.5 g / 10 min, 4.0 ⁇ 0.5 g / 10 min, 4.5 ⁇ 0.5 g / 10 min or 5.0 ⁇ 0.5 g / 10 min.
- MFI B melt flow index
- the melt flow index is usually measured at 190 ° C., in the case of polypropylenes and propylene copolymers
- MFI A > MFI B. In another preferred embodiment, MFI A ⁇ MFI B.
- layer B is based on a polymer or polymer blend having a density p B (ISO 1183 / ASTM D792) in the range of 0.95 ⁇ 0.10 g cm '3 , more preferably 0.90 ⁇ 0.05 g cm ' 3 , 0.95 ⁇ 0.05 g cm -3 or 1.00 ⁇ 0.05 g cm -3 ; more preferably 0.935 ⁇ 0.025 g cm -3 , more preferably 0.930 ⁇ 0.020 g cm -3 or 0.940 ⁇ 0.020 g cm -3 ; more preferably 0.925 ⁇ 0.015 g cm -3 , 0.935 ⁇ 0.015 g cm -3 or 0.945 ⁇ 0.015 g cm -3 ; most preferably 0.920 ⁇ 0.010 g cm -3 , 0.930 ⁇ 0.010 g cm -3 , 0.940 ⁇ 0.010 g cm -3 or 0.950 ⁇ 0.010 g cm -3 and in particular 0.920 ⁇
- p A > ⁇ B. In another preferred embodiment, p A ⁇ B.
- layer B is based on at least one (co) polyolefin, preferably on a polyethylene, ethylene copolymer, polypropylene, propylene copolymer, polystyrene, styrene copolymer, polybutene, butene copolymer, polyisoprene, isoprene copolymer or the like mixtures.
- Ethylene copolymers are preferred, wherein they are particularly preferably selected from the group consisting of ethylene-alkyl acrylate copolymer, ethylene-vinyl acetate copolymer, ethylene-maleic anhydride copolymer and ethylene-alkylacrylate-maleic anhydride copolymer.
- the alkyl acrylate is preferably methyl acrylate, ethyl acrylate or butyl acrylate.
- the proportion of the alkyl acrylate is preferably in the range of 10 to 40 mol%, more preferably 15 to 35 mol%, even more preferably 20 to 30 mol%.
- An example of a suitable ethylene-methacrylate copolymer is Elvaloy ® monitor AC1224, having a density of 0.944 g cm "3 and a melt flow index of 2 g / 10 min and contains a proportion of 24 mol .-% of methyl acrylate.
- the proportion of the vinyl acetate is preferably in the range of 10 to 40 mol%, more preferably 15 to 35 mol%, even more preferably 20 to 30 mol%.
- An example of a suitable ethylene-vinyl acetate copolymer is ELVAX ® 3190LG 1 having a density of 0.950 g cm "3 and a melt flow index of 2 g / 10 min and contains a proportion of 25% of vinyl acetate mol.-.
- layer B is based on an ethylene / maleic anhydride copolymer, it is preferably a linear polyisocyanate modified with maleic anhydride. low density ethylene (LLDPE).
- the proportion of the maleic anhydride is preferably in the range of 0.5 to 5.0 mol%, more preferably 1.0 to 4.5 mol%, even more preferably 1.5 to 4.0 mol%.
- An example of a suitable ethylene-maleic anhydride copolymer is Bynel ® 4157N, having a density of 0.920 g cm "3 and a melt flow index of 3 g / 10 min.
- the alkyl acrylate is preferably methyl acrylate, ethyl acrylate or butyl acrylate.
- the proportion of the alkyl acrylate is preferably in the range of 1.0 to 20 mol%, more preferably 2.0 to 15 mol%, even more preferably 3.0 to 10 mol%, and the proportion of the maleic anhydride is preferably in the range from 1.0 to 10 mol%, more preferably 1.5 to 7.5 mol%, even more preferably 2.0 to 5.0 mol%.
- ethylene-alkyl acrylate-maleic anhydride copolymer is Lotader ® 3210, which has a density of 0.930 g cm "3 and a melt flow index of 5 g / 10 min, a content of 6.0 mol .-% of butyl acrylate and Contains 3.0 mol .-% maleic anhydride.
- the multilayer film according to the invention on the side of layer B 1, which layer A faces away, a layer C which is based on a thermoplastic polymer is arranged. Accordingly, the multilayer film according to the invention preferably has the layer sequence ADB // C.
- Layer C is preferably at least monoaxial, preferably biaxially oriented and / or transparent. Preferably, layer C forms an outer surface of the multilayer film.
- Layer C preferably has a layer thickness in the range of 5.0 to 150 ⁇ m, more preferably 7.5 to 125 ⁇ m, even more preferably 10 to 100 ⁇ m, most preferably 12.5 to 75 ⁇ m and in particular 15 to 50 ⁇ m.
- Layer C is preferably based on at least one (co) polyolefin, preferably on polyethylene, ethylene copolymer, polypropylene, propylene copolymer, polystyrene, styrene copolymer or mixtures thereof.
- Layer C is preferably based on a polymer or polymer blend having a density p c in the range 0.90 to 1.20 g cm -3 .
- layer C is based on polyethylene, preferably low density polyethylene (LDPE) 1, ie, a density in the range of 0.915 to 0.935 g cm -3 .
- LDPE low density polyethylene
- the density is in the range of 0.920 to 0.935 g cm -3 , more preferably 0.925 to 0.935 g cm “3 and in particular 0.930 to 0.935 g cm “ 3 and a melt flow index MFI C.
- the melt flow index MFI C is preferably in the range from 1.5 to 4.5 g / 10 min, more preferably 2.0 to 4.0 g / 10 min and in particular 2.5 to 3.5 g / 10 min.
- a suitable LDPE is, for example, ExxonMobil LD 151 ®, which has a density of 0.9335 g cm "1 and a melt flow index of 3 g / 10 min.
- Layer C is preferably based on a (co) polyolefin or a mixture of several (co) polyolefins having a melting temperature T m c and a VICAT softening temperature T v c , where T m c > T m B and / or T v c > T V B , preferably T m c > T m B > T v c ⁇ T V B or T m c > T v c > T m B > T v B.
- MFI is C > MFI B. In another preferred embodiment, MFI C ⁇ MFI B.
- both p B and p c are in the range of 0.935 ⁇ 0.015 g cm -3 and MFI C > MFI B or MFI B > MFI C , preferably both MFI B and MFI C being in the range of 2.5 ⁇ 1.5 g / 10 min, more preferably 2.5 ⁇ 1.0 g / 10 min, more preferably 2.5 ⁇ 0.5 g / 10 min.
- one or more intermediate layers may be arranged.
- layer C directly adjoins layer B.
- the multilayer film according to the invention can have one or more further layers, which can form intermediate or outer layers of the multilayer film.
- the further layers which may be present are preferably based, identically or differently, on thermoplastic polymers selected from (co) polyolefins, (co) polyesters and (co) polyamides.
- the polymers may optionally be foamed.
- the multilayer film according to the invention has a barrier layer BA, which is preferably gas- and / or aroma-tight.
- the barrier layer BA can also provide protection against moisture and / or prevent the migration of low molecular weight constituents of the multilayer film into the packaged goods.
- the gas-tightness of the multilayer film according to the invention is preferably less than 50, more preferably less than 40, more preferably less than 25 and in particular less than 10 [cm 3 / m 2 dbar O 2 ] at 23 ° C. and 0%. rel. Humidity.
- the optionally present barrier layer BA is preferably based on at least one polymer selected from the group comprising ethylene-vinyl alcohol copolymer (EVOH); Polyvinylidene chloride (PVDC); Vinylidene chloride copolymer, preferably with a proportion of vinylidene chloride of 80% or more, preferably Saran ® , possibly also as a blend with other polymers, such as EVA; Polyester and polyamide; preferably on ethylene-vinyl alcohol copolymer.
- the optionally present barrier layer BA preferably has a thickness of 0.5 to 15 ⁇ m, more preferably 1.0 to 10 ⁇ m, more preferably 1.5 to 9 ⁇ m, most preferably 2.0 to 8 ⁇ m and in particular 2.5 up to 7.5 ⁇ m.
- the barrier layer BA is preferably embedded in two adhesion promoter layers HVi and HV 2 and / or two polyamide layers PAi and PA 2 .
- the multilayer film according to the invention preferably comprises the following layers in the following sequence:
- Adhesion promoters are coextrudable, adhesion-promoting polymers. Preference is given to modified polyolefins, such as, for example, LDPE, LLDPE, mPE, EVA, EAA, EMAA, (co) PP, EPC, which are reacted with at least one monomer from the group of .alpha.,. Beta.-monounsaturated dicarboxylic acids, such as, for example, maleic acid, Fumaric acid, itaconic acid, or their anhydrides, esters, amides or imides, are grafted.
- modified polyolefins such as, for example, LDPE, LLDPE, mPE, EVA, EAA, EMAA, (co) PP, EPC, which are reacted with at least one monomer from the group of .alpha.,.
- Beta.-monounsaturated dicarboxylic acids such as, for example, maleic acid, Fumaric acid, itaconic
- copolymers of ethylene with ⁇ , ß-mono-unsaturated monocarboxylic acids such as acrylic acid, methacrylic acid and / or their metal salts with zinc or sodium and / or CrC can 4 alkyl esters are used, wherein in addition also at least one monomer from the group ⁇ , ß-monounsaturated dicarboxylic acids, such as maleic acid, fumaric acid, itaconic acid, or their anhydrides, esters, amides or imides, can be grafted.
- polyolefins such as, for example, PE, PP, ethylene / propylene copolymers or ethylene / ⁇ -olefin copolymers which have been copolymerized with ethylene with ⁇ , ⁇ -monounsaturated monocarboxylic acids, such as acrylic acid, methacrylic acid and / or their metal salts are grafted with zinc or sodium and / or their Ci-C 4 -alkyl esters.
- Beta.-monounsaturated dicarboxylic anhydride in particular maleic anhydride, are particularly suitable as adhesion promoters.
- the adhesion promoters may also contain an ethylene / vinyl acetate copolymer (EVA), preferably having a vinyl acetate content of at least 10% by weight.
- EVA ethylene / vinyl acetate copolymer
- the optionally present adhesion promoter layer (s) H 1 and HV 2 preferably have, identically or differently, a thickness of 0.1 to 25 ⁇ m, more preferably 0.2 to 15 ⁇ m, even more preferably 0.5 to 10 microns, most preferably 1, 0 to 7.5 microns and in particular from 2.0 to 5.0 microns.
- the optionally present polyamide layer (s) PAi and PA 2 are preferably based on the polyamides listed above in connection with the layers A and preferably have the same or different thicknesses of 0.1 to 25 ⁇ m, more preferably from 0.2 to 15 ⁇ m, more preferably from 0.5 to 10 ⁇ m, most preferably from 1.0 to 7.5 ⁇ m, and most preferably from 2.0 to 5.0 ⁇ m.
- the multilayer film according to the invention preferably has the layer sequence S // AD-B // C, wherein in particular between the sealing layer S and layer A one, two, three or four additional intermediate layers can be arranged. This is expressed for the purpose of description by the sign "//”.
- Preferred layer sequences of the multilayer film according to the invention are shown below, it being possible for further, unspecified (intermediate) layers to be present in each case:
- the layer thickness of the individual layers preferably lies within the stated ranges (all values in ⁇ m) and, if appropriate, further unspecified (intermediate) layers may be present:
- the individual layers of the multilayer film according to the invention may contain customary amounts of customary auxiliaries, such as pigments, lubricants, spacers, antifogging agents, etc.
- Another object of the invention relates to a method for producing the multilayer film described above
- a film 1 comprising layer A, which forms at least one of the two surfaces of the film 1 and on at least part of this surface has a printed and / or metallized and / or coated with a (semi-) metal oxide region D;
- a film 2 comprising layer B, which forms at least one of the two surfaces of the film 2, this surface optionally being treated with a corona discharge;
- film 1 and / or film 2 comprises at least one at least monoaxially oriented layer and the method comprises the steps:
- T is below T V A and / or below T m B.
- T is in the range of 50 0 C to 130 0 C, preferably 60 ° C to 130 ° C, more preferably 70 0 C to 130 ° C, most preferably 80 0 C to 130 0 C and in particular 90 0 C to 13O 0 C.
- T is in the range of 50 0 C to 130 ° C, more preferably 50 ° C to 120 ° C, more preferably 50 0 C to 110 ° C, most preferably 50 0 C to 100 0 C and especially 50 ° C to 90 ° C.
- p is at least 5.0 N / mm, more preferably at least 10 N / mm, even more preferably at least 15 N / mm, most preferably at least 20 N / mm, and most preferably at least 25 N / mm.
- the pressure p is in the range of 17.5 to 35 N / mm.
- each section of the multilayer film is heated to the temperature T for a duration of at most 10 seconds, more preferably at most 5 seconds, even more preferably at most 1 second, most preferably at most 0.5 seconds and in particular at most 0.1 seconds ,
- the invention further relates to a multilayer film, which is obtainable by the method described above.
- Another object of the invention relates to a package comprising the multilayer film described above.
- the package is a sealed tubular bag or a sealed package of trough and lid, the multi-layer film forming the lid.
- the determination of the bond strength between layer A and layer B of the multilayer film according to the invention is preferably carried out in accordance with DIN 53 357 method B.
- the determination of the curl of the multilayer film according to the invention is preferably carried out by the cross-cut method.
- the curl is defined as the distance of the rolled edges of a cross-cut, separated for the longitudinal and transverse directions. This distance is given in mm.
- the pattern is preferably taken from an inner layer of the roll of the multilayer film. For freshly made rolls, the pattern should be taken from a fixed position, ie at least the second layer of film. The sample should be removed from the roll immediately prior to measurement and the curl immediately measured.
- the measurement is preferably carried out at 23 ° C and medium humidity.
- a template according to Figures 1 and 2 is placed so that the cuts are made diagonally to the direction of the film.
- the cutting length is 113 ⁇ 1 mm in each case.
- the template is removed.
- the template comprises a sheet 1 of thickness 3 mm, two plastic ball heads 2 with a diameter of 32 mm, two countersunk screws 3, 2 nuts 4 and two washers 5.
- the distance between the two mutually parallel screw axes is 132 mm ,
- the distance of the roll edges is measured separately for the longitudinal and the transverse direction, with low curl from tip to tip, with higher tendency to curl from inner edge to inner edge (see Figure 3).
- Multilayer films of the general structure ADB // C were produced by combining the composite AD and the composite BC.
- layer A was printed on one of its surfaces.
- the printed image was unchanged, ie without Treatment with a primer, combined with the composite B // C at the indicated temperatures under pressure.
- a suitable temperature T can be found at which a bond strength of at least 1.0 N / 15 mm is achieved.
- the optimum temperature T can be found by simple routine experiments.
- BOPP 1 -D- ⁇ -PE 1 // PE copolymer // - ⁇ -PE 2 -®-met-BOPP 2 .
- P-E copolymer means a layer based on a propylene-ethylene copolymer.
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Abstract
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CA002656476A CA2656476A1 (en) | 2006-07-07 | 2007-07-04 | Multilayer film |
US12/307,429 US20090280278A1 (en) | 2006-07-07 | 2007-07-04 | Multilayer film |
EP07785889A EP2040920A1 (de) | 2006-07-07 | 2007-07-04 | Mehrschichtfolie |
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DE102011001332A1 (de) * | 2010-10-29 | 2012-05-03 | Huhtamaki Ronsberg, Zweigniederlassung Der Huhtamaki Deutschland Gmbh & Co. Kg | Laminat sowie daraus hergestellter Verpackungsbehälter |
DE102010050022B4 (de) * | 2010-11-02 | 2013-05-16 | Wipak Walsrode Gmbh & Co. Kg | Leicht zu öffnende Verpackung |
DE202014010749U1 (de) | 2014-08-22 | 2016-07-13 | Mondi Consumer Packaging Technologies Gmbh | Seitenfaltenverpackungsbeutel |
USD767406S1 (en) | 2015-08-26 | 2016-09-27 | The J.M. Smucker Company | Package with peanut shaped window |
DE102016122818B4 (de) | 2016-11-25 | 2019-11-28 | Waldemar Schmidt | Co-extrudierte PVC-Lebensmittelverpackungsfolie und Verfahren zu deren Herstellung |
DE102018132343A1 (de) * | 2018-12-14 | 2020-06-18 | Mondi Ag | Kunststofffolienverbund, Kunststoffverpackung sowie Verfahren zur Herstellung eines Kunststofffolienverbundes |
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WO1993008018A1 (en) * | 1991-10-17 | 1993-04-29 | Paramount Packaging Corporation | Thermoformable laminate material with registered print and method of making the same |
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GB8315001D0 (en) * | 1983-06-01 | 1983-07-06 | Ici Plc | Multiple-layer polyolefin films |
US5728224A (en) * | 1995-09-13 | 1998-03-17 | Tetra Laval Holdings & Finance S.A. | Apparatus and method for manufacturing a packaging material using gaseous phase atmospheric photo chemical vapor deposition to apply a barrier layer to a moving web substrate |
AU5886899A (en) * | 1998-09-22 | 2000-04-10 | Flex Pack International (Holdings) Limited | A process for the production of a laminated film |
US6368722B1 (en) * | 1998-12-02 | 2002-04-09 | Toray Industries, Inc. | Laminated film and process |
EP1029661B1 (de) * | 1999-02-17 | 2004-11-03 | Alcan Technology & Management AG | Verbundfolie und Verfahren zu ihrer Herstellung |
AUPQ466599A0 (en) * | 1999-12-15 | 2000-01-13 | Sporos Sa | Multilayer heat shrinkable film |
DE10030377A1 (de) * | 2000-06-21 | 2002-06-06 | Wolff Walsrode Ag | Verpackungsfolie mit verbesserter Packungsdichtigkeit sowie deren Verwendung als Verpackungsfolie |
US20020110656A1 (en) * | 2001-02-13 | 2002-08-15 | Sonoco Development, Inc. | Flexible non-foil-based retort package |
EP1391295B1 (de) * | 2002-08-20 | 2010-03-17 | Curwood, Inc. | Verpackungsfolie, Verpackung und Verfahren zum aseptischen Verpacken |
DE202004010591U1 (de) * | 2004-07-06 | 2004-09-30 | Nittel Gmbh & Co. Kg | Verbundfolie sowie Verpackung, enthaltend diese Verbundfolie |
US20070128393A1 (en) * | 2005-12-06 | 2007-06-07 | Moulton Jeffrey D | Heat sealable PCTFE film and tubing using high VF2 containing copolymers of CTFE/VF2 |
-
2006
- 2006-07-07 DE DE102006031841A patent/DE102006031841A1/de not_active Withdrawn
-
2007
- 2007-07-04 WO PCT/EP2007/005896 patent/WO2008003471A1/de active Application Filing
- 2007-07-04 US US12/307,429 patent/US20090280278A1/en not_active Abandoned
- 2007-07-04 EP EP07785889A patent/EP2040920A1/de not_active Withdrawn
- 2007-07-04 CA CA002656476A patent/CA2656476A1/en not_active Abandoned
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO1993008018A1 (en) * | 1991-10-17 | 1993-04-29 | Paramount Packaging Corporation | Thermoformable laminate material with registered print and method of making the same |
Also Published As
Publication number | Publication date |
---|---|
US20090280278A1 (en) | 2009-11-12 |
EP2040920A1 (de) | 2009-04-01 |
DE102006031841A1 (de) | 2008-01-10 |
CA2656476A1 (en) | 2008-01-10 |
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