EP3829858A1

EP3829858A1 - Flat composite for producing dimensionally stable food containers, containing a polymer layer with a polyester and an isotropic modulus of elasticity

Info

Publication number: EP3829858A1
Application number: EP19746462.1A
Authority: EP
Inventors: Daniel Heinze; Marielle SCHLOEMER
Original assignee: SIG Technology AG
Current assignee: Sig Services Ag
Priority date: 2018-07-31
Filing date: 2019-07-26
Publication date: 2021-06-09
Also published as: CN112543701B; CN112543701A; BR112021001824A2; WO2020025471A1; DE102018212797A1; JP2021533008A; US20210245472A1; MX2021001291A

Abstract

The invention relates to a flat composite, containing a) a support layer and b) a barrier layer as layers which lie one over the other in the direction from the exterior of the flat composite to the interior of the flat composite, said flat composite additionally containing a polymer layer P, wherein the polymer layer P a. contains a polyester, b. extends two-dimensionally on a layer plane, c. has a first modulus of elasticity in a first layer direction lying on the layer plane, and d. has another modulus of elasticity in another layer direction which lies on the layer plane and is perpendicular to the first layer direction, the ratio of the first modulus of elasticity to the other modulus of elasticity ranging from 0.81 to 1.19. The invention additionally relates to a method for producing a flat composite, a container precursor, a container, and the aforementioned method products, to a container precursor and to a container, each of which contains at least one flat region of the flat composite, and to uses of the flat composite, an extruder, a chain modifier, a mixture, a base polymer, and polyesters.

Description

FLAT-SHAPED COMPOSITE FOR THE PRODUCTION OF STABLE FOOD CONTAINERS, INCLUDING A POLYMER LAYER WITH A

POLYESTER AND ISOTROPEM E-MODULE

The present invention relates to a sheet-like composite, comprising as superimposed layers in the direction from an outside of the sheet-like composite to an inside of the sheet-like composite

a) a carrier layer, and

b) a barrier layer;

wherein the sheet-like composite additionally contains a polymer layer P, the polymer layer P

a. contains a polyester,

b. extends flat in a layer plane,

c. has a first modulus of elasticity in a first layer direction lying in the layer plane, and

d. has a further modulus of elasticity in a further layer direction lying in the layer plane and perpendicular to the first layer direction;

wherein a ratio of the first modulus of elasticity to the further modulus of elasticity is in a range from 0.81 to 1.19. Furthermore, the invention relates to methods for producing a sheet-like composite, a container precursor and a container, and to the aforementioned process products; a container precursor and a container, each containing at least one sheet-like region of the sheet-like composite; and uses of the sheet-like composite, an extruder, a chain modifier, a mixture, a base polymer, and polyester. Food has been preserved for a long time, be it food for human consumption or animal products by storing them either in a can or in a glass jar with a lid. On the one hand, the shelf life can be increased by sterilizing the food and the container, here glass or can, separately as much as possible and then filling the food in the container and sealing it. However, these measures, which have proven themselves over a long period of time, to increase the shelf life of foodstuffs have a number of disadvantages, for example a subsequent need for subsequent disinfection. Because of their essentially cylindrical shape, cans and glasses have the disadvantage that very dense and space-saving storage is not possible. In addition, cans and glasses have a considerable weight, which leads to increased energy consumption during transport. In addition, the production of glass, tinplate or aluminum, even if the raw materials used for this come from recycling, requires a very high amount of energy. In the case of glasses, there is an added burden of transportation. The glasses are usually prefabricated in a glassworks and then have to be transported to the company filling the food using considerable transport volumes. In addition, jars and cans can only be opened with considerable effort or with the help of tools and thus rather cumbersome. In the case of cans, there is a high risk of injury due to sharp edges that arise when opening. In the case of glasses, glass fragments repeatedly get into the food when filling or opening the filled glasses, which in the worst case can lead to internal injuries when eating the food. In addition, both cans and jars for labeling and advertising the food content must be stuck with labels. The jars and cans cannot easily be directly printed with information and advertising images. In addition to the actual printing, a substrate for this, a paper or a suitable film, and also a fastening means, an adhesive or a sealing means are necessary.

Other packaging systems are known from the prior art in order to store food over a long period of time as far as possible without impairments. This is what it is about are containers made from sheet-like composites - often also referred to as laminates. Such sheet-like composites are often made up of a thermoplastic layer, a carrier layer usually made of cardboard or paper, which gives the container dimensional stability, an adhesion promoter layer, a barrier layer and another plastic layer, as disclosed, inter alia, in WO 90/09926 A2. Since the carrier layer gives the container made from the laminate shape stability, these containers, in contrast to foil bags, can be seen as a further development of the aforementioned glasses and cans. These laminate containers already have many advantages over conventional jars and cans. Nevertheless, there is also room for improvement in these packaging systems. There is a strong need to make the laminate containers more environmentally friendly. In particular, the aim is to produce the polymer layers of the laminates as much as possible from so-called bio-polymers. Bio-polymers are characterized by the fact that they are not obtained from fossil raw materials, but are obtained from renewable raw materials or come from recycling. A method known from the prior art and recognized as particularly advantageous for producing the polymer layers of the laminates is the layer extrusion process. Furthermore, it is known in the prior art to use bio-polyolefins, such as bio-polyethylene, for the production of polymer layers of laminates by means of layer extrusion. Obtaining these bio-polyolefins is complex and therefore also expensive. For example, bio-polyethylene can be obtained from sugar cane. This means that bio-polyolefin can be obtained from renewable raw materials, but it is neither biodegradable nor chemically recyclable. The known bio-polyethylene is therefore not convincing in terms of its environmental compatibility.

Also known in the prior art are other bio-polymers that are easier to manufacture than the bio-polyolefins discussed above. These other bio-polymers include, for example, bio-PET, recycled PET (rPET), PLA and PHB. These bio-polymers are chemically recyclable and even biodegradable in the case of the PLA and PHB. This out From the point of view of environmental compatibility, highly desirable bio-polymers as such show unfavorable processing properties. For example, these bio-polymers can hardly be used to produce polymer layers that can be used for laminates by means of layer extrusion. Attempts to coat the other bio-polymers typically do not provide uniform polymer films, but rather collections of more or less individual polymer islands or strands which are unusable as a polymer layer for laminates. Furthermore, it is hardly possible to improve the processing properties by forming blends, since the aforementioned further bio-polymers can hardly be mixed with suitable polymers. In general, it is an object of the present invention to at least partially overcome a disadvantage that arises from the prior art. Another object of the invention is to provide the most environmentally friendly laminate for producing dimensionally stable food containers, the polymer layers of which can be obtained by means of layer extrusion. According to a further object of the invention, the polymer layers of the laminate can be obtained from polymers that are as simple and inexpensive to manufacture as possible. It is also an object of the invention to provide a laminate for producing dimensionally stable food containers which has at least one polymer layer which can be obtained by means of layer extrusion and which contains a bio-polymer which can be produced as simply and inexpensively as possible. Another object of the invention is to provide one of the above-mentioned advantageous laminates, the polymers of the polymer layers showing the best possible processing properties in the layer extrusion. Such processing properties are shown, for example, in the smallest possible neck-in, the least possible edge waving and / or the formation of a polymer melt film which is as uniform as possible. Another object of the invention is to provide one of the aforementioned advantageous laminates, the laminate showing as good a printability as possible with a color decor, in particular in a gravure printing process, on its outside. Another object of the invention is to provide one of the above-mentioned advantageous laminates, the laminate exhibiting the best possible adhesion between the layers of the laminate, in particular a decor on the outside and / or between a barrier layer and a carrier layer. Another object of the invention is to provide a dimensionally stable laminate food Provide medium container that shows the highest possible reliability of the container in a moist environment. Furthermore, it is an object of the invention to provide a dimensionally stable laminate food container which enables the foodstuffs stored therein, in particular a fat-containing foodstuff, to be kept as long as possible. Furthermore, it is an object of the invention to provide a dimensionally stable laminate food container which shows the best possible opening properties, in particular when opening with an opening aid. Another object of the invention is to provide a manufacturing method for the aforementioned laminate and / or the container. The independent claims contribute to at least partially fulfilling at least one, preferably more, of the above tasks. The dependent claims provide preferred embodiments that help at least partially accomplish at least one of the tasks.

An embodiment 1 of a sheet-like composite 1, comprising as superimposed layers in the direction from an outside of the sheet-like composite to an inside of the sheet-like composite, makes a contribution to fulfilling at least one of the tasks according to the invention

a) a carrier layer, and

b) a barrier layer;

a. contains a polyester,

b. extends in a layered plane,

a ratio of the first modulus of elasticity to the further modulus of elasticity in a range from 0.81 to 1.19, preferably from 0.82 to 1.18, more preferably from 0.83 to 1.17, before from 0.84 to 1.16, more preferably from 0.85 to 1.15, more preferably from 0.86 to 1.14, more preferably from 0.87 to 1.17, more preferably from 0.88 to 1.12, more preferably from 0.89 to 1.11, more preferably from 0.9 to 1.1, more preferably from 0.91 to 1.09, more preferably from 0.92 to 1.08, more preferably from 0.93 to 1.07, more preferably from 0.94 to 1.06, still more preferably from 0.95 to 1.05, most preferably from 0.96 to 1.04. The first and the further modulus of elasticity are each determined according to the method specified here.

In an embodiment 2 according to the invention, the sheet-like composite 1 is designed in accordance with embodiment 1, the polymer layer P being obtained by means of melt coating a sheet-like composite precursor. The sheet-like composite precursor preferably contains the carrier layer. A polymer layer P obtained by melt coating the sheet-like composite precursor is to be distinguished in particular from a polymer layer which was provided as a prefabricated film and applied to or introduced into a composite precursor. In this context, melt coating means that the polymer layer P is at least partially, preferably completely, melted onto the sheet-like composite precursor and solidifies on the composite precursor. A preferred melt coating is melt extrusion coating. When looking at a cross section through the layer sequence of the sheet-like composite under the scanning electron microscope (SEM), a polymer layer P obtained by means of melt coating often shows less straight, that is to say rougher layer boundaries with the adjacent layers compared to a polymer film. This is precisely because the polymer layer P was applied as a melt, that is to say liquid, as a result of which the melt adapts to the roughness of the adjacent layers. A polymer layer made of a prefabricated film, on the other hand, shows comparatively sharp and smooth borders with the neighboring layers. Furthermore, since there is no melting of a film when it is applied or introduced into a composite, the film does not adapt to the surfaces of the adjacent layers, so that there are often voids between the film and the adjacent layers. In particular at the high coating speeds customary in the technical field, the cavities described are often not completely filled with lamination agents, so that there are gas inclusions between the film and the adjacent layers comes. These gas inclusions can be recognized by the cross section under the SEM and represent an indication of a layer applied as a film.

In an embodiment 3 according to the invention, the sheet-like composite 1 is designed according to its embodiment 1 or 2, the first modulus of elasticity being in a range from 100 to 3000 MPa, preferably from 120 to 2500 MPa, more preferably from 140 to 2200 MPa.

In an embodiment 4 according to the invention, the sheet-like composite 1 is designed according to one of its previous embodiments, the further modulus of elasticity being in a range from 100 to 3000 MPa, preferably from 140 to 2600 MPa, more preferably from 150 to 2250 MPa.

In an embodiment 5 according to the invention, the sheet-like composite 1 is configured according to one of its previous embodiments, the polymer layer P comprising the polyester in a proportion in a range from 5 to 100% by weight, preferably from 10 to 100% by weight, more preferably from 20 to 100% by weight, more preferably from 30 to 100% by weight, more preferably from 40 to 100% by weight, more preferably from 50 to 100% by weight, more preferably from 55 to 100% by weight, more preferably from 60 to 100% by weight, more preferably from 65 to 100% by weight, more preferably from 70 to 100% by weight, more preferably from 75 to 100% by weight, more preferably from 80 to 100% by weight, more preferably from 85 to 100% by weight, more preferably from 90 to 100% by weight, more preferably from 92 to 100% by weight, more preferably from 94 to 100% by weight, even more preferably from 96 to 100% by weight , most preferably from 98 to 100% by weight, based in each case on the weight of the polymer layer P.

In an embodiment 6 according to the invention, the sheet-like composite 1 is designed according to its previous embodiments, the polyester being a homopolymer. A homopolymer is a polymer that is made up of exactly one monomer. The homopolymer thus has exactly one repeat unit. Homopolymers are in contrast to copolymers, which are made up of several different monomers.

In an embodiment 7 according to the invention, the sheet-like composite 1 is designed according to one of its previous embodiments, wherein a carbon fraction of the polymer layer P is at least 25%, more preferably at least 30%, more preferably at least 40%, more preferably at least 50%, more preferably at at least 60%, more preferably at least 70%, more preferably at least 80%, most preferably at least 90%, is bio-based. The bio-based portion of the carbon portion of the polymer layer P is determined according to the method specified herein.

In an embodiment 8 according to the invention, the sheet-like composite 1 is designed according to one of its previous embodiments, the polyester being obtainable from a renewable raw material. Obtaining the polyester from the renewable raw material preferably includes a chemical reaction, preferably a chain extension reaction, of a base polymer with a chain modifier, the base polymer being obtainable from the renewable raw material. Additionally or alternatively, obtaining the polyester from the renewable raw material includes a process which involves monomer formation or a polymerization reaction or both, preferably at least the monomer formation taking place in a fermentation. The above-mentioned process preferably enables the base polymer to be obtained from the renewable raw material.

In an embodiment 9 according to the invention, the sheet-like composite 1 is designed according to one of its previous embodiments, the polyester being a thermoplastic polymer. In an embodiment 10 according to the invention, the sheet-like composite 1 is configured according to one of its previous embodiments, the polymer layer P having a melting temperature of more than 145 ° C., preferably more than 146 ° C., more preferably more than 147 ° C., more preferably more than 148 ° C, more than 149 ° C, more than 150 ° C, more than 155 ° C, more than 158 ° C, more than 160 ° C, more than 161 ° C C, preferably more than 162 ° C, preferably more than 163 ° C, more preferably more than 164 ° C, more preferably more than 165 ° C, more preferably more than 166 ° C, more preferably more than 167 ° C, preferably more than 168 ° C., more preferably more than 169 ° C., more preferably more than 170 ° C., more preferably more than 175 ° C., more preferably more than 180 ° C., more preferably more than 190 ° C., more preferably of more than 200 ° C, more preferably of more than 210 ° C, bev or more than 220 ° C, more preferably more than 230 ° C, more preferably more than 235 ° C, most preferably more than 238 ° C. The melting temperature is determined using the measurement method specified here. The above melting temperature of the polymer layer P is preferably not more than 500 ° C, more preferably not more than 450 ° C, more preferably not more than 400 ° C, more preferably not more than 350 ° C, most preferably not more than 300 ° C. The polyester preferably has the above-mentioned melting temperature of the polymer layer P.

In an embodiment 11 according to the invention, the sheet-like composite 1 is designed according to its previous embodiments, the polyester being selected from the group consisting of a polylactide (PLA), a polyhydroxyalkanoate, and a polyalkylene terephthalate, or a combination of at least two of them. A preferred polyhydroxyalkanoate (PHA) is a polyhydroxybutyrate (PHB). A preferred polyhydroxybutyrate is poly (R) -3-hydroxybutyrate (P (3HB)). A preferred polyalkylene terephthalate is polybutylene terephthalate or polyethylene terephthalate (PET), with PET being particularly preferred. A preferred PET is a recycled PET or a bio-PET or both. In this context, bio-PET is a PET whose carbon content is at least 25%, more preferably at least 30%, bio-based. In an embodiment 12 according to the invention, the sheet-like composite 1 is configured according to one of its previous embodiments, the polymer layer P having an intrinsic viscosity in a range from 0.5 to 1.0 dl / g, preferably from 0.6 to 1.0 dl / g g, more preferably from 0.7 to 1.0 dl / g. The intrinsic viscosity of the polymer layer P is determined by the method described herein.

In an embodiment 13 according to the invention, the sheet-like composite 1 is configured according to one of its previous embodiments, the polymer layer P being in a range from 2 to 15 g / 10 min, preferably from 3 to 15 g / by a melt flow rate (MFR). 10 min, more preferably from 4 to 15 g / 10 min, most preferably from 5 to 15 g / 10 min.

In an embodiment 14 according to the invention, the sheet-like composite 1 is designed in accordance with one of its previous embodiments, the polymer layer P being adjacent to the carrier layer or to the barrier layer or to both. The polymer layer P preferably adjoins the carrier layer.

In an embodiment 15 according to the invention, the sheet-like composite 1 is configured according to one of its previous embodiments, the sheet-like composite comprising a polymer outer layer, the polymer outer layer overlaying the carrier layer on a side of the carrier layer facing away from the barrier layer. In one embodiment, the sheet-like composite includes the polymer layer P as the outer polymer layer. In a further preferred embodiment, the sheet-like composite contains the polymer outer layer in addition to the polymer layer P.

In an embodiment 16 according to the invention, the sheet-like composite 1 is configured according to one of its previous embodiments, the sheet-like composite comprising a polymer inner layer, the polymer inner layer overlaying the barrier layer on a side of the barrier layer facing away from the carrier layer. In an execution form, the sheet-like composite contains the polymer layer P as the polymer inner layer. In a further preferred embodiment, the sheet-like composite contains the polymer inner layer in addition to the polymer layer P. In an embodiment 17 according to the invention, the sheet-like composite 1 is designed according to one of its previous embodiments, the support layer being overlaid with a paint application on a side of the support layer facing away from the barrier layer is. The paint application is preferably arranged on a side of the polymer outer layer facing the carrier layer or on a side of the polymer outer layer facing away from the carrier layer. The application of paint preferably forms a decor of the sheet-like composite or of a container to be produced from the sheet-like composite. The color application preferably comprises at least one colorant, more preferably at least 2, more preferably at least 3, more preferably at least 4, more preferably at least 5, most preferably at least 6, colorants. The aforementioned colorants preferably relate to colors different from one another. In an embodiment 18 according to the invention, the sheet-like composite 1 is designed according to one of its previous embodiments, the sheet-like composite between the carrier layer and the barrier layer including an intermediate polymer layer. In one embodiment, the sheet-like composite includes the polymer layer P as the intermediate polymer layer. In a further preferred embodiment, the sheet-like composite contains the polymer intermediate layer in addition to the polymer layer P.

In an embodiment 19 according to the invention, the sheet-like composite 1 is designed according to one of its previous embodiments, the sheet-like composite being a blank for producing a single, preferably closed, container.

In an embodiment 20 according to the invention, the sheet-like composite 1 is designed according to one of its previous embodiments, with the carrier layer at least has a hole. A preferred hole has a diameter of at least 4 mm, more preferably at least 5 mm, most preferably at least 9 mm.

In an embodiment 21 according to the invention, the sheet-like composite 1 is designed according to its embodiment 20, the hole being covered at least with the barrier layer as a hole cover layer. The hole is preferably further covered with one selected from the group consisting of the polymer layer P, the polymer inner layer, the polymer outer layer, and the polymer intermediate layer or a combination of at least two of them, particularly preferably with the polymer layer P. Layers that cover the hole are referred to herein as hole cover layers. If at least 2 perforated cover layers are present, the perforated cover layers in the hole preferably form a layer sequence of layers interconnected in the hole.

In an embodiment 22 according to the invention, the sheet-like composite 1 is designed according to one of its previous embodiments, one selected from the group consisting of the polymer inner layer, the polymer intermediate layer and the polymer outer layer, or a combination of at least two of which are a polyethylene or a polypropylene or a mixture of includes both, preferably consists of them. In an embodiment 23 according to the invention, the sheet-like composite 1 is designed in accordance with one of its previous embodiments, the carrier layer preferably comprising one selected from the group consisting of cardboard, cardboard and paper, or a combination of at least two of these. The carrier layer preferably has a basis weight in a range from 140 to 400 g / m ² , preferably from 150 to 350 g / m ² , more preferably from 160 to 330 g / m ² , even more preferably from 160 to 300 g / m ² , more preferably from 160 to 250 g / m ² , most preferably from 160 to 240 g / m ² .

In an embodiment 24 according to the invention, the sheet-like composite 1 is designed according to one of its previous embodiments, the barrier layer being made of an selected from the group consisting of a plastic, a metal, and a metal oxide, or a combination of at least two of them, preferably consists thereof.

In an embodiment 25 according to the invention, the sheet-like composite 1 is designed according to one of its previous embodiments, the polymer layer P having a first shear viscosity at a first shear frequency of 0.1 rad / s and a further shear viscosity at a further shear frequency of 100 rad / s, wherein a ratio of the first shear viscosity to the further shear viscosity is at least 3, preferably at least 4, more preferably at least 5, more preferably at least 6, more preferably at least 6.5, more preferably at least 7, more preferably at least 8, more preferably at least 9, more preferably at least 10, more preferably at least 11, most preferably at least 12. The aforementioned ratio is preferably not more than 30, preferably not more than 20. The first and the further shear viscosity are each determined according to the method specified here. The first shear viscosity and the further shear viscosity stand for values of the physical quantity shear viscosity, which is a function of the physical quantity shear frequency. Furthermore, the first shear frequency and the further shear frequency stand for values of the physical quantity shear frequency, which is a parameter of the physical quantity shear viscosity.

In an embodiment 26 according to the invention, the sheet-like composite 1 is configured according to its embodiment 25, the further shear viscosity being 100 to 10,000 Pa s, more preferably 100 to 9000 Pa s, more preferably 100 to 8000 Pa s, more preferably 500 to 8000 Pa s , more preferably by 1000 to 8000 Pa s, more preferably by 1200 to 8000 Pa s, more preferably by 1500 to 7800 Pa s, most preferably by 1500 to 7600 Pa s, less than the first shear viscosity. In a further preferred embodiment, the further shear viscosity is less than the first shear viscosity by 1000 to 2000 Pa s, preferably by 1200 to 1800 Pa s, more preferably by 1400 to 1600 Pa s. In a further preferred embodiment, the further shear viscosity is less than the first shear viscosity by 6500 to 8300 Pa s, preferably by 6800 to 8000 Pa s, more preferably by 7000 to 7600 Pa s. In an embodiment 27 according to the invention, the sheet-like composite 1 is configured according to its embodiments 25 or 26, a dependence of a shear viscosity of the polymer layer P on a shear frequency in the range from the first shear frequency to the further shear frequency by a monotonically falling function, more preferably by a strict one monotonically falling function is described. The shear viscosity is determined using the method described here.

In an embodiment 28 according to the invention, the sheet-like composite 1 is designed in accordance with one of its previous embodiments, the polymer layer P showing a non-linear dependence of its shear viscosity on a shear frequency. The shear viscosity is determined using the method described herein. The dependence of the shear viscosity on the shear frequency is non-linear here if an increase in the shear viscosity above the shear frequency is not constant. Here an absolute amount of the increase in the shear viscosity above the shear frequency preferably decreases with increasing shear frequency. Furthermore, the slope of the shear viscosity above the shear frequency is preferably negative, which means that this slope preferably increases with increasing shear frequency. The shear viscosity preferably shows the non-linear dependence on the shear frequency at least in a range from the first shear frequency to the further shear frequency. In an embodiment 29 according to the invention, the sheet-like composite 1 is configured according to one of its embodiments 25 to 28, wherein a shear viscosity of the polymer layer P is a function of a shear frequency, the function being a first slope at the first shear frequency and a further slope at the further shear frequency has, the further slope is different from the first slope. An absolute amount of the further slope is preferably less than an absolute amount of the first slope. Furthermore, the first and the further slope are preferably negative. Accordingly, the further slope is preferably greater than the first slope. The shear viscosity is determined using the method given herein. An absolute amount of the further gradient is preferred by at least 200 Pa s ² / rad, more preferably by at least 300 Pa s ² / rad, more preferably by at least 400 Pa s ² / rad, more preferably by at least 500 Pa s ² / rad, more preferably by at least 1000 Pa s ² / rad, preferably by at least 2000 Pa s ² / rad, more preferably by at least 3000 Pa s ² / rad, more preferably by at least 4000 Pa s ² / rad, more preferably by at least 5000 Pa s ² / rad, more preferably by at least 6000 Pa s ² / rad, more preferably by at least 7000 Pa s ² / rad, most preferably by at least 7500 Pa s ² / rad, different from an absolute amount of the first slope, more preferably less than the absolute amount of the first slope. The first shear frequency and the further shear frequency stand for values of the physical quantity shear frequency, which is a parameter of the function which describes the dependence of the shear viscosity on the shear frequency. In an embodiment 30 according to the invention, the sheet-like composite 1 is designed according to one of its previous embodiments, the polymer layer P having a density of more than 1.1 g / cm ³ , preferably more than 1.15 g / cm ³ , more preferably at least 1 , 2 g / cm ³ . The density of the polymer layer P is particularly preferably in a range from 1.2 to 2 g / cm ³ , more preferably from 1.2 to 1.5 g / cm ³ , most preferably from 1.2 to 1.4 g / cm ³ ,

An embodiment 1 of a method 1, including as method steps, makes a contribution to fulfilling at least one of the tasks according to the invention

a) Provide

i) a sheet-like composite precursor, comprising a carrier layer, and ii) a polymer composition P, comprising a polyester; and b) superimposing the carrier layer with the polymer composition P to obtain a polymer layer P overlying the carrier layer;

the polymer layer P

a. extends in a layered plane,

b. has a first modulus of elasticity in a first layer direction lying in the layer plane, and

c. has a further modulus of elasticity in a further layer direction lying in the layer plane and perpendicular to the first layer direction, a ratio of the first modulus of elasticity to the further modulus of elasticity in a range from 0.81 to 1.19, preferably from 0.82 to 1.18, more preferably from 0.83 to 1.17, more preferably from 0.84 to 1, 16, more preferably from 0.85 to 1.15, more preferably from 0.86 to 1.14, more preferably from 0.87 to 1.17, more preferably from 0.88 to 1.12, more preferably from 0.89 to 1, 11, preferably from 0.9 to 1.1, more preferably from 0.91 to 1.09, more preferably from 0.92 to 1.08, more preferably from 0.93 to 1.07, more preferably from 0.94 to 1.06, more preferably from 0.95 to 1.05, most preferably from 0.96 to 1.04. The polymer layer P is preferably obtained from the polymer composition P, preferably by cooling and solidifying the polymer composition P. The carrier layer is preferably formed according to one embodiment of the sheet-like composite 1 according to the invention. The first and the further modulus of elasticity are determined according to the method specified here. The carrier layer is preferably formed in accordance with an embodiment of the sheet-like composite 1 according to the invention. In an embodiment 2 according to the invention, the method 1 is designed according to its embodiment 1, the polymer composition P being liquid when it is superimposed in method step b). The polymer composition P preferably has a temperature above its melting temperature when superimposed in process step b). The polymer composition P is preferably melted during the superimposition in process step b). The superimposition in process step b) is particularly preferably carried out as melt coating. A preferred melt coating is melt extrusion coating.

An embodiment 1 of a method 2, including as method steps, makes a contribution to fulfilling at least one of the tasks according to the invention

a) Provide

i) a sheet-like composite precursor, comprising a carrier layer, and ii) a polymer composition P, comprising a polyester; and b) superimposing the carrier layer with the polymer composition P to obtain a polymer layer P overlying the carrier layer; wherein the polymer composition P is liquid when superimposed in process step b). The polymer composition P preferably has a temperature above its melting temperature when superimposed in process step b). The polymer composition P is preferably melted during the superimposition in process step b). The superimposition in process step b) is particularly preferably carried out as melt coating. A preferred melt coating is melt extrusion coating. The polymer layer P is preferably obtained from the polymer composition P, preferably by cooling and solidifying the polymer composition P. The carrier layer is preferably formed according to an embodiment of the sheet-like composite 1 according to the invention.

In an embodiment 2 according to the invention, the method 2 is configured according to its embodiment 1, wherein the polymer layer P extends in a flat manner in a layer plane, the polymer layer P

a] in a first layer direction lying in the layer plane, a first elastic modulus, and

b] has a further modulus of elasticity in a further layer direction lying in the layer plane and perpendicular to the first layer direction, a ratio of the first modulus of elasticity to the further modulus of elasticity in a range from 0.81 to 1.19, preferably from 0.82 to 1.18, more preferably from 0.83 to 1.17, more preferably from 0.84 to 1.16, more preferably from 0.85 to 1.15, more preferably from 0.86 to 1.14, more preferably from 0.87 to 1.17, more preferably from 0.88 to 1.12, more preferably from 0.89 to 1.11, more preferably from 0.9 to 1.1, more preferably from 0.91 to 1.09, more preferably from 0.92 to 1.08, more preferably from 0.93 to 1.07, more preferably from 0.94 to 1.06, still more preferably from 0.95 to 1.05, most preferably from 0.96 to 1.04. The first and the further modulus of elasticity are each determined according to the method specified here.

In an embodiment 3 according to the invention, method 1 or 2 is each designed according to its embodiment 1 or 2, the superimposition in method step b) in each case comprising melt extrusion coating with the polymer composition P. In an embodiment 4 of the method 1 according to the invention, this is designed according to one of its embodiments 1 to 3 and in an embodiment 4 of the method 2 according to the invention, it is designed according to one of its embodiments 2 or 3, the first modulus of elasticity in each case in a range from 100 to 3000 MPa, preferably from 120 to 2500 MPa, more preferably from 140 to 2200 MPa.

In an embodiment 5 according to the invention, method 1 is designed according to one of its embodiments 1 to 4 and method 2 according to one of its embodiments 2 to 4, the further modulus of elasticity in each case in a range from 100 to 3000 MPa, preferably from 140 to 2600 MPa , more preferably from 150 to 2250 MPa.

In an embodiment 6 according to the invention, the method 1 or 2 is in each case designed according to one of its embodiments preceding embodiments, the provision of the polymer composition P in the method step a)

A) providing a base polymer and a chain modifier, and

B) reacting the base polymer with the chain modifier to obtain the polyester

includes. Reacting the base polymer with the chain modifier preferably involves a chain extension reaction.

In an embodiment 7 according to the invention, the method 1 or 2 is each designed according to its embodiment 6, in step B) the base polymer and the chain modifier in a weight ratio of chain modifier to the base polymer in a range from 0.0001 to 0.1, preferably from 0.0002 to 0.07, more preferably from 0.0005 to 0.05, even more preferably from 0.0007 to 0.03, most preferably from 0.001 to 0.01. In an embodiment 8 according to the invention, method 1 and method 2 are each designed according to their embodiment 6 or 7, the base polymer being obtainable from a renewable raw material. The base polymer is preferably obtainable from the renewable raw material by means of a process which includes a monomer formation or a polymerization reaction or both, preferably at least the monomer formation taking place in a fermentation.

In an embodiment 9 according to the invention, method 1 and method 2 are each designed according to one of their embodiments 6 to 8, the reaction of the base polymer with the chain modifier taking place at least partially in an extruder.

In an embodiment 10 according to the invention, method 1 and method 2 are each designed according to one of their previous embodiments, the planar composite precursor being provided rolled up into a roll in method step a).

In an embodiment 11 according to the invention, method 1 and method 2 are each designed according to one of their embodiments 1 to 10, wherein a carbon fraction of the polymer composition P is at least 25%, more preferably at least 30%, more preferably at least 40%, more preferably at least 50%, more preferably at least 60%, more preferably at least 70%, more preferably at least 80%, most preferably at least 90%, is bio-based. The bio-based carbon content of the polymer layer P is determined according to the method specified here. In an embodiment 12 according to the invention, method 1 and method 2 are each designed according to one of their embodiments 1 to 11, the polymer composition P comprising the polyester in a proportion in a range from 5 to 100% by weight, preferably from 10 to 100% by weight %, more preferably from 20 to 100% by weight, more preferably from 30 to 100% by weight, more preferably from 40 to 100% by weight, more preferably from 50 to 100% by weight, more preferably from 55 to 100% by weight, more preferably from 60 to 100% by weight, more preferably from 65 to 100 % By weight, more preferably from 70 to 100% by weight, more preferably from 75 to 100% by weight, more preferably from 80 to 100% by weight, more preferably from 85 to 100% by weight, more preferably from 90 to 100 % By weight, more preferably from 92 to 100% by weight, more preferably from 94 to 100% by weight, even more preferably from 96 to 100% by weight, most preferably from 98 to 100% by weight, in each case based on to the weight of the polymer composition P, includes.

In an embodiment 13 according to the invention, method 1 and method 2 are each designed according to one of their embodiments 1 to 12, the polyester being a homopolymer.

In an embodiment 14 according to the invention, method 1 and method 2 are each designed according to one of their embodiments 1 to 13, the polyester being a thermoplastic polymer. In an embodiment 15 according to the invention, method 1 and method 2 are each designed according to one of their embodiments 1 to 14, the polymer composition P having a melting temperature of more than 145 ° C., preferably more than 146 ° C., more preferably more than 147 ° C, preferably more than 148 ° C, more preferably more than 149 ° C, more preferably more than 150 ° C, more preferably more than 155 ° C, more preferably more than 158 ° C, more preferably more than 160 ° C, more preferably more than 161 ° C, more than 162 ° C, more than 163 ° C, more than 164 ° C, more than 165 ° C, more than 166 ° C, more of more than 167 ° C, more preferably more than 168 ° C, more preferably more than 169 ° C, more preferably more than 170 ° C, more preferably more than 175 ° C, more preferably more than 180 ° C, more preferably more than 190 ° C, more preferably more than 200 ° C, more preferably more than 210 ° C, more preferably more than 220 ° C, more preferably more than 230 ° C, more preferably more than 235 ° C, most preferably more than 238 ° C. The melting temperature is determined according to the measurement method specified here. The above melting temperature of the polymer composition P is preferably not more than 500 ° C., more preferably not more than 450 ° C., more preferably not more than 400 ° C., more preferably not more than 350 ° C., on the not more than 300 ° C. The polyester preferably has the above-mentioned melting temperature of the polymer composition P.

In an embodiment 16 according to the invention, method 1 and method 2 are each designed according to one of their embodiments 1 to 15, the polyester being selected from the group consisting of a polylactide (PLA), a polyhydroxyalkanoate, and a polyalkylene terephthalate, or from one Combination of at least two of them. A preferred polyhydroxyalkanoate (PHA) is a polyhydroxybutyrate (PHB). A preferred polyhydroxybutyrate is poly (R) -3-hydroxybutyrate (P (3HB)). A preferred polyalkylene terephthalate is polybutylene terephthalate or polyethylene terephthalate (PET), with PET being particularly preferred. A preferred PET is a recycled PET or a bio-PET or both. In this context, bio-PET is a PET whose carbon content is at least 25%, more preferably at least 30%, bio-based. In an embodiment 17 according to the invention, method 1 and method 2 are each designed according to one of their embodiments 1 to 16, the polymer composition P having an intrinsic viscosity in a range from 0.5 to 1.0 dl / g, preferably from 0.6 to 1.0 dl / g, more preferably 0.7 to 1.0 dl / g. The intrinsic viscosity of the polymer composition P is determined by the method described herein.

In an embodiment 18 according to the invention, the method 1 and the method 2 are each designed according to one of their embodiments 1 to 17, the polymer composition P being preferred by a melt flow rate (MFR) in a range from 2 to 15 g / 10 min from 3 to 15 g / 10 min, more preferably from 4 to 15 g / 10 min, most preferably from 5 to 15 g / 10 min.

In an embodiment 19 according to the invention, method 1 and method 2 are each designed according to one of their embodiments 1 to 18, step b) the polymer composition P is applied directly to the carrier layer. As a result, the polymer layer P adjoins the carrier layer.

In an embodiment 20 according to the invention, method 1 and method 2 are each designed according to one of their embodiments 3 to 20, wherein in method step b) the polymer composition P has a neck-in in a range from 10 to 25, preferably from 12 to 23, more preferably from 14 to 21, more preferably from 16 to 19, most preferably from 17 to 18. The neck-in is determined according to the method specified here.

In an embodiment 21 according to the invention, method 1 and method 2 are each designed according to one of their embodiments 1 to 20, the method further comprising overlaying the carrier layer with a barrier layer. The barrier layer is preferably formed in accordance with an embodiment of the sheet-like composite 1 according to the invention. The barrier layer is preferably overlaid in such a way that the polymer layer P adjoins the barrier layer.

In an embodiment 22 according to the invention, the method 1 and the method 2 are each designed according to their embodiment 21, the overlaying of the carrier layer with the barrier layer taking place before the overlaying of the carrier layer with the polymer composition P of process step b). In this embodiment, the polymer layer P obtained from the polymer composition P is preferably an inner polymer layer. The polymer inner layer is preferably formed or arranged in accordance with one embodiment of the sheet-like composite 1 according to the invention, or both.

In an embodiment 23 according to the invention, the method 1 and the method 2 are each designed according to their embodiment 21, the overlaying of the carrier layer with the barrier layer taking place in a method step c). The overlaying with the barrier layer of process step c) preferably does not take place before the overlaying with the polymer composition P of process step b). The overlaying is also preferably carried out with the Barrier layer of process step c) after being overlaid with the polymer composition P of process step b), simultaneously with process step b) or overlapping in time with process step b). In the latter case, the layering with the polymer composition P preferably begins before the layering with the barrier layer. In this embodiment, the polymer layer P obtained from the polymer composition P is preferably an intermediate polymer layer or an outer polymer layer. The polymer outer layer and the polymer intermediate layer are preferably each formed or arranged in accordance with one embodiment of the sheet-like composite 1 according to the invention, or both. In an embodiment 24 according to the invention, the method 1 and the method 2 are each designed according to one of their embodiments 21 to 23, the overlaying of the backing layer with the polymer composition P of process step b) taking place on the same side of the backing layer as the overlaying of the backing layer with the barrier layer , In this embodiment, the polymer layer P obtained from the polymer composition P is preferably an intermediate polymer layer or an inner polymer layer. The polymer intermediate layer and the polymer inner layer are each preferably formed or arranged in accordance with one embodiment of the sheet-like composite 1 according to the invention, or both. In an embodiment 25 according to the invention, method 1 and method 2 are each designed according to one of their embodiments 21 to 23, the overlaying of the carrier layer with the polymer composition P of process step b) taking place on a first side of the backing layer, with the overlaying of the backing layer with the barrier layer takes place on a side of the carrier layer opposite the first side. In this embodiment, the polymer layer P obtained from the polymer composition P is preferably an outer polymer layer. The polymer outer layer is preferably formed or arranged according to one embodiment of the sheet-like composite 1 according to the invention, or both. In an embodiment 26 according to the invention, the method 1 and the method 2 are each designed according to one of their embodiments 1 to 25, wherein at least one hole is produced in the carrier layer before the method step b), the hole at least with the polymer layer in the method step b) P is covered. Preferably, the hole is additionally or alternatively covered with the barrier layer when the carrier layer is overlaid with the barrier layer.

In an embodiment 27 according to the invention, method 1 and method 2 are each designed according to one of their embodiments 21 to 26, the method further comprising overlaying the barrier layer on a side of the barrier layer facing away from the carrier layer with an inner polymer layer. The inner polymer layer is preferably formed in accordance with one embodiment of the sheet-like composite 1 according to the invention. In an embodiment 28 according to the invention, method 1 and method 2 are each designed according to one of their embodiments 21 to 27, an intermediate polymer layer being arranged between the carrier layer and the barrier layer when the carrier layer is overlaid with the barrier layer. The intermediate polymer layer is preferably formed in accordance with an embodiment of the sheet-like composite 1 according to the invention.

In an embodiment 29 according to the invention, the method 1 and the method 2 are each designed according to one of their embodiments 1 to 28, the method additionally comprising overlaying the support layer with an application of paint. In a preferred embodiment, the support layer is overlaid with the color application after the support layer has been overlaid with the polymer outer layer, on the same side of the support layer. In a further preferred embodiment, the support layer is overlaid with the color application before the support layer is overlaid with the outer polymer layer on the same side of the support layer. In an embodiment 30 according to the invention, the method 1 and the method 2 are each designed according to their embodiment 29, the overlaying of the carrier layer with the paint application taking place before method step b). In an embodiment 31 according to the invention, the method 1 and the method 2 are each designed according to their embodiment 29, the overlaying of the carrier layer with the paint application taking place after method step b).

In an embodiment 32 according to the invention, method 1 and method 2 are each designed according to one of their embodiments 29 to 31, the overlaying of the carrier layer with the paint application and the overlaying of the carrier layer with the polymer composition P of process step b) being carried out on the same side of the carrier layer ,

In an embodiment 33 according to the invention, the method 1 and the method 2 are each designed according to one of their embodiments 1 to 32, a sheet-like composite being obtained from the sheet-like composite precursor, the method additionally cutting the sheet-like composite into a blank for producing of a single, preferably closed, container. In an embodiment 34 according to the invention, the method 1 and the method 2 are each designed according to one of their embodiments 1 to 33, the method being a method for producing a flat composite, preferably the flat composite 1 according to the invention according to one of its embodiments. In an embodiment 35 according to the invention, the method 1 and the method 2 are each designed according to one of their embodiments 1 to 34, the polymer composition P having a first shear viscosity at a first shear frequency of 0.1 rad / s and at a further shear frequency of 100 rad / s has a further shear viscosity, a ratio of the first shear viscosity to the further shear viscosity being at least 3, preferably at least 4, more preferably at least 5, more preferably at least 6, more preferably at least 6.5, more preferably at least 7, more preferably at least 8, more preferably at least 9, more preferably at least 10, more preferably at least 11, most preferably at least 12. The aforementioned ratio is preferably not more than 30, preferably not more than 20. The first and the further shear viscosity are each determined according to the method specified here. The first shear viscosity and the further shear viscosity stand for values of the physical quantity shear viscosity, which is a function of the physical quantity shear frequency. Furthermore, the first shear frequency and the further shear frequency stand for values of the physical quantity shear frequency, which is a parameter of the physical quantity shear viscosity. In an embodiment 36 according to the invention, method 1 and method 2 are each designed according to their embodiment 35, the further shear viscosity being 100 to 10,000 Pa s, more preferably 100 to 9000 Pa s, more preferably 100 to 8000 Pa s, more preferably 500 to 8000 Pa s, more preferably around 1000 to 8000 Pa s, more preferably around 1200 to 8000 Pa s, more preferably around 1500 to 7800 Pa s, most preferably around 1500 to 7600

Pa s, less than the first shear viscosity. In a further preferred embodiment, the further shear viscosity is less than the first shear viscosity by 1000 to 2000 Pa s, preferably by 1200 to 1800 Pa s, more preferably by 1400 to 1600 Pa s. In a further preferred embodiment, the further shear viscosity is less than the first shear viscosity by 6500 to 8300 Pa s, preferably by 6800 to 8000 Pa s, more preferably by 7000 to 7600 Pa s.

In an embodiment 37 according to the invention, method 1 and method 2 are each designed according to their embodiment 35 or 36, a dependence of a shear viscosity of the polymer composition P on a shear frequency in the range from the first shear frequency to the further shear frequency by a monotonically falling function, more preferably by a strictly monotonically falling function. The shear viscosity is determined using the method described here.

In an embodiment 38 according to the invention, method 1 and method 2 are each designed according to one of their previous embodiments, the polymer Composition P shows a non-linear dependence of its shear viscosity on a shear frequency. The shear viscosity is determined using the method described herein. The dependence of the shear viscosity on the shear frequency is non-linear here if an increase in the shear viscosity above the shear frequency is not constant. Here, an absolute amount of the increase in the shear viscosity above the shear frequency preferably decreases with increasing shear frequency. Furthermore, the slope of the shear viscosity above the shear frequency is preferably negative, with the result that this slope preferably increases with increasing shear frequency. The shear viscosity preferably shows the non-linear dependence on the shear frequency at least in a range from the first shear frequency to the further shear frequency.

In an embodiment 39 according to the invention, method 1 and method 2 are each designed according to one of their embodiments 35 to 38, wherein a shear viscosity of the polymer composition P is a function of a shear frequency, the function at the first shear frequency and a first slope and at the further Shear frequency has a further slope, the further slope being different from the first slope. An absolute amount of the further slope is preferably less than an absolute amount of the first slope. Furthermore, the first and the further slope are preferably negative. Accordingly, the further slope is preferably greater than the first slope. The shear viscosity is determined using the method given herein. An absolute amount of the further gradient is preferred by at least 200 Pa s ² / rad, more preferably by at least 300 Pa s ² / rad, more preferably by at least 400 Pa s ² / rad, more preferably by at least 500 Pa s ² / rad, more preferably by at least 1000 Pa s ² / rad, more preferably at least 2000 Pa s ² / rad, more preferably at least 3000 Pa s ² / rad, more preferably at least 4000 Pa s ² / rad, more preferably at least 5000 Pa s ² / rad, more preferably at least 6000 Pa s ² / rad, more preferably by at least 7000 Pa s ² / rad, most preferably by at least 7500 Pa s ² / rad, different from an absolute amount of the first slope, more preferably less than the absolute amount of the first slope. The first shear frequency and the further shear frequency stand for values of the physical quantity shear frequency, which is a parameter of the function which describes the dependence of the shear viscosity on the shear frequency. In an embodiment 40 according to the invention, the method 1 and the method 2 are each designed according to one of their embodiments 1 to 39, the polymer composition P having a density of more than 1.1 g / cm ³ , preferably of more than 1.15 g / cm ³ , more preferably at least 1.2 g / cm ³ . The density of the polymer composition P is particularly preferably in a range from 1.2 to 2 g / cm ³ , more preferably from 1.2 to 1.5 g / cm ³ , most preferably from 1.2 to 1.4 g / cm ³ cm ³ . Furthermore, the polymer layer P obtained from the polymer composition P preferably has the above density.

An embodiment 1 of a sheet-like composite 2, obtainable by method 1 or 2 in each case according to one of its embodiments 1 to 40, contributes to fulfilling at least one of the tasks according to the invention. The sheet-like composite 2 preferably has one or more features of the sheet-like composite 1 according to one of its embodiments.

An embodiment 1 of a container precursor 1, comprising at least one flat region of the flat composite 1 or 2, in each case according to one of its embodiments, makes a contribution to fulfilling at least one of the tasks according to the invention. The container precursor preferably contains a blank of the sheet-like composite for producing an individual container.

In an embodiment 2 according to the invention, the container precursor 1 is designed according to its embodiment 1, the flat area having at least two folds, preferably at least 3 folds, more preferably at least 4 folds. In an embodiment 3 according to the invention, the container precursor 1 is designed according to its embodiment 1 or 2, the flat region including a first longitudinal edge and a further longitudinal edge, the first longitudinal edge being connected to the further longitudinal edge to form a longitudinal seam of the container precursor. An embodiment 1 of a container 1, comprising at least one flat region of the flat composite 1 or 2, in each case according to one of its embodiments, contributes to fulfilling at least one of the tasks according to the invention. The container according to the invention is preferably a closed container. The container preferably contains a blank of the sheet-like composite for producing an individual container.

In an embodiment 2 according to the invention, the container 1 is designed according to its embodiment 1, the flat region having at least two folds, preferably at least 3 folds, more preferably at least 4 folds.

In an embodiment 3 according to the invention, the container 1 is designed according to its embodiment 1 or 2, the sheet-like region including a first longitudinal edge and a further longitudinal edge, the first longitudinal edge being connected to the further longitudinal edge to form a longitudinal seam of the container.

In an embodiment 4 according to the invention, the container 1 is designed according to one of its embodiments 1 to 3, the container containing a food product.

An embodiment 1 of a method 3, including as method steps, makes a contribution to fulfilling at least one of the tasks according to the invention

a. Providing at least one sheet-like area of the sheet-like composite 1 or 2, in each case according to one of its embodiments, the at least one sheet-like area including a first longitudinal edge and a further longitudinal edge;

b. Folding the at least one sheet-like region; and

c. Contacting and connecting the first longitudinal edge with the further longitudinal edge while maintaining a longitudinal seam. Method 3 is preferably a method for producing a container precursor. A preferred container precursor is a food container precursor. The joining in process step c. is preferably done as a seal. An embodiment 1 of a container precursor 2, obtainable by the method 3 according to its embodiment 1, makes a contribution to fulfilling at least one of the tasks according to the invention.

An embodiment 1 of a method 4, including as method steps, makes a contribution to fulfilling at least one of the tasks according to the invention

A. Providing container precursor 1 or 2, each according to one of its embodiments;

B. forming a bottom portion of the container precursor by folding the sheet-like portion;

C. closing the floor area;

D. filling the container precursor with a food; and

E. Closing the container precursor in a head area to obtain a closed container.

Method 4 is preferably a method for producing the closed container. A preferred closed container is a food container. Sealing in process step C) preferably includes sealing, more preferably hot air sealing. Closing in method step E) preferably includes sealing, more preferably ultrasonic sealing. In an embodiment 2 according to the invention, the method 4 is configured according to its embodiment 1, with at least a part of the sheet-like region being more preferred during the folding in method step B. A temperature in a range from 10 to 50 ° C., preferably from 15 to 40 ° C. from 16 to 30 ° C, most preferably from 18 to 25 ° C. In an embodiment 3 according to the invention, the method 4 is designed according to its embodiment 1 or 2, the sealing in method step C. or E. or in both including sealing, the sealing by one selected from the group consisting of irradiation , contact with a hot solid, excitation of mechanical vibration, and contact with a hot gas, or by a combination of at least two of them. A different seal from the aforementioned group can be used in method step C. than in method step E. and vice versa. However, the same seal can also be used.

In an embodiment 4 according to the invention, the method 4 is designed according to one of its embodiments 1 to 3, the method further comprising a method step

F. Connect the closed container with an opening aid

includes.

An embodiment 1 of a closed container 2, obtainable by the method 4 according to one of its embodiments 1 to 4, makes a contribution to at least one of the tasks according to the invention.

An embodiment 1 of a use 1 of the sheet-like composite 1 or 2, in each case according to one of its embodiments, for producing a food container makes a contribution to the fulfillment of at least one of the tasks according to the invention. A preferred food container is a closed container filled with a food.

An embodiment 1 of a use 2 of an extruder for reacting a base polymer with a chain modifier to obtain a polymer P and for producing a flat composite for a food container by means of melt extrusion coatings with the polymer P makes a contribution to at least one of the tasks according to the invention. The base polymer and the chain mo preferably in a weight ratio of chain modifier to base polymer in a range from 0.0001 to 0.1, preferably from 0.0002 to 0.07, more preferably from 0.0005 to 0.05, still more preferably from 0.0007 to 0 , 03, most preferably from 0.001 to 0.01, contacted with each other. Reacting the base polymer with the chain modifier preferably involves a chain extension reaction. The polymer P is preferably a polyester.

The sheet-like composite preferably contains as superimposed layers in the direction from an outside of the sheet-like composite to an inside of the sheet-like composite

a) a carrier layer, and

b) a barrier layer,

wherein the sheet-like composite additionally contains a polymer layer P, the polymer layer P containing the polymer P. The sheet-like composite is preferably designed according to an embodiment of the sheet-like composite 1 according to the invention. The polymer P is preferably the polyester according to an embodiment of the sheet-like composite 1 according to the invention. Alternatively or additionally, the base polymer is the base polymer according to an embodiment of the sheet-like composite 1 according to the invention. Alternatively or additionally, the polymer layer P has one or more features of the polymer layer P according to an embodiment of the sheet-like composite 1 according to the invention. In particular, a carbon fraction of the base polymer is preferably at least 25%, more preferably at least 30%, more preferably at least 40%, more preferably at least 50%, more preferably at least 60%, more preferably at least 70%, even more preferably at least 80% most preferably at least 90% bio-based.

An embodiment 1 of a use 3 of a chain modifier for producing a flat composite for a food container contributes to the fulfillment of at least one of the tasks according to the invention. The sheet-like composite preferably contains as superimposed layers in the direction from an outside of the sheet-like composite to an inside of the sheet-like composite

a) a carrier layer, and b) a barrier layer,

wherein the sheet-like composite additionally contains a polymer layer P, the polymer layer P containing a polymer P, the polymer P being obtainable by reacting a base polymer with the chain modifier. The polymer P is preferably a polyester. To react, the base polymer and chain modifier are preferably used in a weight ratio of chain modifier to base polymer in a range from 0.0001 to 0.1, preferably from 0.0002 to 0.07, more preferably from 0.0005 to 0.05 more preferably from 0.0007 to 0.03, most preferably from 0.001 to 0.01. Reacting the base polymer with the chain modifier preferably involves a chain extension reaction. The sheet-like composite is preferably designed according to an embodiment of the sheet-like composite 1 according to the invention. The polymer P is preferably the polyester according to an embodiment of the sheet-like composite 1 according to the invention. Alternatively or additionally, the base polymer is the base polymer according to an embodiment of the sheet-like composite 1 according to the invention. Altematively or additionally, the polymer layer P has one or more features of the polymer layer P according to an embodiment of the sheet-like composite 1 according to the invention. In particular, a carbon fraction of the base polymer is preferably at least 25%, more preferably at least 30%, more preferably at least 40%, more preferably at least 50%, more preferably at least 60%, more preferably at least 70%, even more preferably at least 80% most preferably at least 90% bio-based.

An embodiment 1 of a use 4 of a mixture, comprising a base polymer and a chain modifier, for producing a flat composite for a food container makes a contribution to fulfilling at least one of the tasks according to the invention. The blend includes the base polymer and chain modifier preferably in a chain modifier to base polymer weight ratio in a range from 0.0001 to 0.1, preferably from 0.0002 to 0.07, more preferably from 0.0005 to 0.05 more preferably from 0.0007 to 0.03, most preferably from 0.001 to 0.01. The sheet-like composite preferably contains as superimposed layers in the direction from an outside of the sheet-like composite to an inside of the sheet-like composite a) a carrier layer, and

b) a barrier layer,

wherein the sheet-like composite additionally contains a polymer layer P, the polymer layer P contains a polymer P, the polymer P being obtainable by reacting the base polymer with the chain modifier. The polymer P is preferably a polyester. Reacting the base polymer with the chain modifier preferably involves a chain extension reaction. The sheet-like composite is preferably designed according to an embodiment of the sheet-like composite 1 according to the invention. The polymer P is preferably the polyester according to an embodiment of the sheet-like composite 1 according to the invention. Alternatively or additionally, the base polymer is the base polymer according to an embodiment of the sheet-like composite 1 according to the invention. Alternatively or additionally, the polymer layer P has one or more features of the polymer layer P according to an embodiment of the sheet-like composite 1 according to the invention. In particular, a carbon fraction of the base polymer is preferably at least 25%, more preferably at least 30%, more preferably at least 40%, more preferably at least 50%, more preferably at least 60%, more preferably at least 70%, even more preferably at least 80% , most preferably at least 90%, bio-based.

An embodiment 1 of a use 5 of a base polymer for producing a sheet-like composite for a food container by means of a reaction of the base polymer with a chain modifier contributes to the fulfillment of at least one of the tasks according to the invention. For the reaction, the base polymer and the chain modifier are preferably used in a weight ratio of chain modifier to base polymer in a range from 0.0001 to 0.1, preferably from 0.0002 to 0.07, more preferably from 0.0005 to 0.05 , more preferably from 0.0007 to 0.03, most preferably from 0.001 to 0.01. Reacting the base polymer with the chain modifier preferably involves a chain extension reaction. The sheet-like composite preferably contains as superimposed layers in the direction from an outside of the sheet-like composite to an inside of the sheet-like composite

a) a carrier layer, and b) a barrier layer,

wherein the sheet-like composite additionally contains a polymer layer P, the polymer layer P containing a polymer P, the polymer P being obtainable by reacting the base polymer with the chain modifier. The polymer P is preferably a polyester. The sheet-like composite is preferably designed according to one embodiment of the sheet-like composite 1 according to the invention. The polymer P is preferably the polyester according to an embodiment of the sheet-like composite 1 according to the invention. Alternatively or additionally, the base polymer is the base polymer according to an embodiment of the sheet-like composite 1 according to the invention. Alternatively or additionally, the polymer layer P preferably has one or more features of the polymer layer P according to an embodiment of the sheet-like composite 1 according to the invention. In particular, a carbon fraction of the base polymer is preferably at least 25%, more preferably at least 30%, more preferably at least 40%, more preferably at least 50%, more preferably at least 60%, more preferably at least 70%, even more preferably at least 80% most preferably at least 90% bio-based.

An embodiment 1 of a use 6 of a polyester for producing a flat composite for a food container by means of melt extrusion coating with the polyester makes a contribution to fulfilling at least one of the tasks according to the invention.

a) a carrier layer, and

b) a barrier layer,

wherein the sheet-like composite additionally contains a polymer layer P, the polymer layer P containing the polyester. The sheet-like composite is preferably designed according to an embodiment of the sheet-like composite 1 according to the invention. The polyester preferably has one or more features of the polyester of the sheet according to the invention. Chen-shaped composite 1. In particular, a carbon fraction of the polyester is preferably at least 25%, more preferably at least 30%, more preferably at least 40%, more preferably at least 50%, more preferably at least 60%, more preferably at least 70%, even more preferably at least 80% most preferably at least 90%, bio-based. The polyester is further preferably selected from the group consisting of a polylactide (PLA), a polyhydroxyalkanoate, and a polyalkylene terephthalate, or from a combination of at least two of them. A preferred polyhydroxyalkanoate (PHA) is a polyhydroxybutyrate (PHB). A preferred polyhydroxybutyrate is poly (R) -3-hydroxybutyrate (P (3HB)). A preferred polyalkylene terephthalate is polybutylene terephthalate or polyethylene terephthalate (PET), with PET being particularly preferred. A preferred PET is a recycled PET or a bio-PET or both. In this context, bio-PET is a PET whose carbon content is at least 25%, more preferably at least 30%, bio-based. An embodiment 1 of a use 7 of a polyester for producing a sheet-like composite for a food container makes a contribution to the fulfillment of at least one of the tasks according to the invention, the sheet-like composite including a polymer layer P, including the polyester, the polymer layer P

a. extends flat in a layer plane

c. in a further layer direction lying in the layer plane and perpendicular to the first layer direction has a further modulus of elasticity, a ratio of the first modulus of elasticity to the further modulus of elasticity in a range from 0.81 to 1.19, preferably from 0.82 to 1.18 , more preferably from 0.83 to 1.17, more preferably from 0.84 to 1.16, more preferably from 0.85 to 1.15, more preferably from 0.86 to 1.14, more preferably from 0.87 to 1.17 , more preferably from 0.88 to 1.12, more preferably from 0.89 to 1.11, more preferably from 0.9 to 1.1, more preferably from 0.91 to 1.09, more preferably from 0.92 to 1.08 , more preferably from 0.93 to 1.07, more preferably from 0.94 to 1.06, more preferably from 0.95 to 1.05, most preferably from 0.96 to 1.04. The first modulus of elasticity and the further elastic each module are determined using the method specified here. The statements made regarding the flat composite 1 regarding the first modulus of elasticity and the further modulus of elasticity preferably apply here analogously. The sheet-like composite preferably contains as superimposed layers in the direction from an outside of the sheet-like composite to an inside of the sheet-like composite

a) a carrier layer, and

b) a barrier layer,

wherein the sheet-like composite additionally contains the polymer layer P. The polyester preferably has one or more features of the polyester of the sheet-like composite 1 according to the invention. In particular, a carbon fraction of the polyester is preferably at least 25%, more preferably at least 30%, more preferably at least 40%, more preferably at least 50%, more preferably at least 60%, more preferably at least 70%, even more preferably at least 80% most preferably at least 90% bio-based. The polyester is further preferably selected from the group consisting of a polylactide (PLA), a polyhydroxyalkanoate, and a polyalkylene terephthalate, or from a combination of at least two of them. A preferred polyhydroxyalkanoate (PHA) is a polyhydroxybutyrate (PHB). A preferred polyhydroxybutyrate is poly (R) -3-hydroxybutyrate (P (3HB)). A preferred polyalkylene terephthalate is polybutylene terephthalate or polyethylene terephthalate (PET), with PET being particularly preferred. A preferred PET is a recycled PET or a bio-PET or both. In this context, bio-PET is a PET whose carbon content is at least 25%, more preferably at least 30%, bio-based. The sheet-like composite is preferably designed according to an embodiment of the sheet-like composite 1 according to the invention. Features which are described as preferred in a category according to the invention, for example according to the flat composite 1, are also preferred in an embodiment of the further categories according to the invention, for example an embodiment of the method 1 or 2 according to the invention. Polvester

In principle, any polyester known to the person skilled in the art and suitable for the use according to the invention, in particular for melt extrusion coating, can be considered as polyester. Here, a polyester is a polymer with an ester function in its main chain. Here, the ester function is defined by the general form - [- CO-O -] -, that is to say by a carbon atom which is bonded to one oxygen atom by means of a double bond and to another oxygen atom by means of a single bond. The repeating units with ester function include in particular

10

where n is a natural number that is at least 2.

Chain modifier

The term chain modifier as used herein means a polymer chain modifier. Any chemical compound that is known to the person skilled in the art and appears suitable for the use according to the invention can be considered as chain modifier. A chain modifier is a chemical compound or a mixture of several chemical compounds from which the polymer P described herein or the polyester of the polymer layer P or the polymer composition P can be obtained by means of a chemical reaction with a base polymer. Here, the polymer P or the polyester has, in particular, a reduced anisotropy of its elastic modulus compared to the base polymer. The base polymer preferably has an elastic modulus A in a first direction and an elastic modulus B in a direction perpendicular to the first direction. The polymer P or the polyester obtained from the base polymer by means of the chain modifier preferably has an elastic modulus C in the first direction and in the an elasticity module D to the first direction. The ratio of the elasticity module A to the elasticity module B differs more from the value 1 than the ratio of the elasticity module C to the elasticity module D. This means that the elasticity module of the polymer P or the polyester is less anisotropic, that is isotropic, than the elastic modulus of the base polymer. In this case, the first direction and the further direction are preferably each selected such that the elasticity module A differs at most from the elasticity module B, and the elasticity module C at most differs from the elasticity module D.

Furthermore, the aforesaid chemical reaction with the chain modifier preferably leads to a broadening of the molecular weight distribution of the polymer P or of the polyester compared to the base polymer, in which the molecular weight distribution forms a shoulder on the side of its maximum towards higher molecular weights or increases one. Alternatively or additionally, the chemical reaction with the chain modifier preferably leads to an increase in a degree of branching of the polymer P or of the polyester compared to the base polymer.

Furthermore, the polymer P or the polyester preferably has a dependence of its shear viscosity on the shear frequency compared to the base polymer at lower shear frequencies, which the base polymer exhibits at least less pronounced, preferably not, at these low shear frequencies. The shear viscosity preferably decreases here with increasing shear frequency. Such a dependency is known as shear thinning (also called structural viscosity). This shear thinning is less pronounced in the base polymer, preferably not present at the low shear frequencies. The above-mentioned low shear frequencies are preferably in the range from 0.1 to 100 Hz. Furthermore, the dependence of the shear viscosity of the polymer P or of the polyester on the shear frequency is preferably described in a non-linear manner or by a monotonically decreasing function, more preferably a strictly monotonically decreasing function , This also preferably applies in the range of the shear frequency from 0.1 to 100 Hz.

A preferred chain modifier is a chain extender, ie it leads to an extension of the polymer chains of the base polymer by means of a chemical reaction. Another preferred chain modifier is an organic chemical compound or a mixture of chemical compounds which contains at least one organic chemical compound, preferably only organic chemical compounds. A preferred chain modifier includes a chemical group selected from the group consisting of an acrylate group, an epoxy group, and an anhydride group, or a combination of at least two of them. A preferred chain modifier has a molecular weight of less than 3,000. Suitable chain modifiers are often sold by polymer manufacturers as "Chainextender ^L" . Suitable Kettenmodifizierer are commercially available for example under the trade name Joncryl ^® from BASF SE or PMDA from Sigma Aldrich.

The polymer P is preferably a polyester, the corresponding base polymer also preferably being a polyester. The above-mentioned chemical reaction is also referred to herein as a chain extension reaction. A preferred chain extension reaction is a polyaddition reaction.

Surface forming composite

All sheet-like composite materials which are conceivable within the scope of the invention and which appear suitable to the person skilled in the art for the use according to the invention for the production of dimensionally stable food containers are suitable as sheet-like composite. Sheet-like composites for the production of food containers are also referred to as laminates. Such sheet-like composites are often made up of a thermoplastic polymer layer, a carrier layer usually made of cardboard or paper, which gives the container its dimensional stability, an adhesion promoter layer, a barrier layer and a further thermoplastic polymer layer, as disclosed inter alia in WO 90/09926 A2 , Polymer P / polymer layer P / polymer composition P

In connection with the polymer P, the polymer layer P and the polymer composition P, the “P” is an index which is intended to identify the polymer or the polymer layer or the polymer composition in relation to the respective general name and other polymers, polymer layers or polymer compositions. Furthermore, this index has no meaning in terms of content and is not an abbreviation. The inventive ß polymer layer P is preferably a layer of the sheet-like composite, which is based at least on the polymer P or the polyester and may contain one or more other polymers. Furthermore, the polymer layer P can contain one or more additives. Herein, the polymer layer P and the polymer composition P preferably each contain the polymer P and the polyester, respectively. Furthermore, the polymer layer P can preferably be obtained from the polymer composition P, particularly preferably by means of melt extrusion. The polymer composition P can be provided, for example, as a polymer melt, granules or powder, the granules or powder preferably being converted into a polymer melt for superimposing the carrier layer. The polymer layer P and the polymer composition P each preferably contain no polymer blend. The polymer P or the polyester is preferably a homopolymer.

Renewable raw material

The polymer P or the polyester is preferably available from one or more renewable raw materials. A preferred renewable raw material is one selected from the group consisting of a plant component, a component of an animal body, and a human or animal excretion, or a combination of at least two of these. The polymer P or the polyester is preferably obtainable from the renewable raw material by a process which contains one or more selected from the group consisting of a monomer formation, a polymerization reaction and a chain extension reaction, preferably at least the monomer formation taking place in a fermentation. Additionally or alternatively, the aforementioned method is a biogenic method. Layers of the sheet-like composite

The layers of the sheet-like composite preferably form a layer sequence. Furthermore, the layers of the sheet-like composite are preferably connected to one another. Two layers are connected when their adhesion to one another exceeds Van der Waals attractions. Interconnected layers are preferably one selected from the group consisting of sealed to one another, glued to one another, and other pressed, or a combination of at least two of them. Unless otherwise stated, the layers can follow one another indirectly, that is to say with one or at least two intermediate layers, or directly, that is to say without an intermediate layer. This is particularly the case with the formulation in which one layer overlaps another layer. A formulation in which a layer sequence contains enumerated layers means that at least the specified layers exist in the specified order. This wording does not necessarily mean that these layers follow one another directly. A wording in which two layers are adjacent to each other means that these two layers follow one another directly and therefore without an intermediate layer. However, this formulation says nothing about whether the two layers are connected or not. Rather, these two layers can be in contact with one another. However, these two layers are preferably connected to one another.

polymer layers

In the following, the term “polymer layer” refers in particular to the polymer inner layer, the polymer intermediate layer and the polymer outer layer, provided that these are not the polymer layer P. A preferred polymer is a polyolefin. The polymer layers can have further constituents. The polymer layers are preferably introduced or applied in the sheet-like composite material in an extrusion process. The other constituents of the polymer layers are preferably constituents which do not adversely affect the behavior of the polymer melt when applied as a layer. The further constituents can be, for example, inorganic compounds, such as metal salts or other plastics, such as further thermoplastic plastics. However, it is also conceivable for the further constituents to be fillers or pigments, for example carbon black or metal oxides. Suitable thermoplastic plastics for the other constituents are, in particular, those which are easy to process due to their good extrusion behavior. Polymers obtained by chain polymerization, in particular polyolefins, are particularly suitable, cyclic olefin copolymers (COC), polycyclic olefin copolymers (POC), in particular polyethylene and polypropylene, being particularly preferred, and polyethylene being particularly preferred. Among the polyethylenes are HDPE (high density polyethylene), MDPE {medium density polyethylene), LDPE (low density polyethylene), LLDPE (linear low density polyethylene) and VLDPE (yery low density polyethylene) and mixtures of at least two of these are preferred. Mixtures of at least two thermoplastics can also be used. Suitable polymer layers have a melt flow rate (MFR) in a range from 1 to 25 g / 10 min, preferably in a range from

2 to 20 g / 10 min and particularly preferably in a range from 2.5 to 15 g / 10 min, and a density in a range from 0.890 g / cm ³ to 0.980 g / cm ³ , preferably in a range from 0.895 g / cm ³ to 0.975 g / cm ³ , and more preferably in a range of 0.900 g / cm ³ to 0.970 g / cm ³ . The polymer layers preferably have at least one melting temperature in a range from 80 to 155 ° C., preferably in a range from 90 to 145 ° C. and particularly preferably in a range from 95 to 135 ° C.

Polvmerinnenschicht

If the polymer layer P is not the inner polymer layer, the inner polymer layer is based on thermoplastic polymers, and the inner polymer layer can contain a particulate inorganic solid. However, it is preferred that the polymer inner layer contains at least 70% by weight, preferably at least 80% by weight and particularly preferably at least 95% by weight, in each case based on the total weight of the polymer inner layer, one or more thermoplastic polymers. The polymer or the polymer mixture of the polymer inner layer preferably has a density (according to ISO 1183-1: 2004) in a range from 0.900 to 0.980 g / cm ³ , particularly preferably in a range from 0.900 to 0.960 g / cm ³ and am most preferably in a range from 0.900 to 0.940 g / cm ³ . Preferably the polymer is a polyolefin, mpolymer, or a combination of both. The polymer inner layer preferably contains a polyethylene or a polypropylene or both. A particularly preferred polyethylene is an LDPE. The polymer inner layer preferably contains the polyethylene or the polypropylene or both together in a proportion of at least 30% by weight, more preferably at least 40% by weight, most preferably at least 50% by weight, in each case based on the total weight of the polymer inner layer. Additionally or alternatively, the polymer inner layer preferably contains an HDPE, preferably in a proportion of at least 5% by weight, more preferably at least 10 % By weight, more preferably at least 15% by weight, most preferably at least 20% by weight, in each case based on the total weight of the inner polymer layer. In addition or as an alternative to one or more of the abovementioned polymers, the inner polymer layer preferably contains a polymer produced by means of a metallocene catalyst, preferably an mPE. The inner polymer layer preferably contains the mPE in a proportion of at least 3% by weight, more preferably at least 5% by weight, in each case based on the total weight of the inner polymer layer. Here, the polymer inner layer can contain 2 or more, preferably 2 or 3, of the aforementioned polymers in a polymer blend, for example at least a portion of the LDPE and the mPE, or at least a portion of the LDPE and the HDPE. Furthermore, the polymer inner layer can preferably comprise 2 or more, preferably 3, sublayers which overlap one another and which preferably form the polymer inner layer. These sub-layers are preferably layers obtained by co-extrusion.

In a preferred embodiment of the sheet-like composite, the polymer inner layer includes a first underlayer in the direction from the outside of the sheet-like composite to the inside of the sheet-like composite, comprising an LDPE in a proportion of at least 50% by weight, preferably at least 60% by weight. %, more preferably at least 70% by weight, even more preferably at least 80% by weight, most preferably at least 90% by weight, in each case based on the weight of the first underlayer; and a further sublayer comprising a blend, the blend being an LDPE in a proportion of at least 30% by weight, preferably at least 40% by weight, more preferably at least 50% by weight, even more preferably at least 60 % By weight, most preferably at least 65% by weight, and an mPE in a proportion of at least 10% by weight, preferably at least 15% by weight, more preferably at least 20% by weight, most preferably at contains at least 25% by weight, based in each case on the weight of the blend. Here, the further lower layer preferably contains the blend in a proportion of at least 50% by weight, preferably at least 60% by weight, more preferably at least 70% by weight, still more preferably at least 80% by weight, most preferably at least 90% by weight, based in each case on the weight of the further lower layer. The additional lower layer particularly preferably consists of the blend. In a further preferred embodiment of the sheet-like composite, the inner polymer layer contains a first underlayer in the direction from the outside of the sheet-like composite to the inside of the sheet-like composite, comprising an HDPE in a proportion of at least 30% by weight, preferably at least 40% by weight %, more preferably at least 50% by weight, even more preferably at least 60% by weight, most preferably at least 70% by weight, and an LDPE in a proportion of at least 10% by weight, preferably at least 15% by weight, more preferably at least 20% by weight, in each case based on the weight of the first underlayer; a second sublayer containing an LDPE in a proportion of at least 50% by weight, preferably at least 60% by weight, more preferably at least 70% by weight, still more preferably at least 80% by weight, most preferably at least 90% by weight, each based on the weight of the second sub-layer; and a third sublayer containing a blend, the blend being an LDPE in a proportion of at least 30% by weight, preferably at least 40% by weight, more preferably at least 50% by weight, even more preferably at least 60% by weight. %, most preferably at least 65% by weight, and an mPE in a proportion of at least 10% by weight, preferably at least 15% by weight, more preferably at least 20% by weight, most preferably at least 25 % By weight, based in each case on the weight of the blend. Here, the third sublayer preferably contains the blend in a proportion of at least 50% by weight, preferably at least 60% by weight, more preferably at least 70% by weight, even more preferably at least 80% by weight, most preferably at least 90 wt .-%, each based on the weight of the third sub-layer. The third sublayer particularly preferably consists of the blend.

Polvmeraußenschicht

If the polymer layer P is not the outer polymer layer, the outer polymer layer preferably contains a polyethylene or a polypropylene or both. LDPE and HDPE and mixtures of these are preferred as polyethylene. A preferred polymer outer layer contains at least 50% by weight, preferably at least 60% by weight, more preferably at least 70% by weight, more preferably at least 80% by weight, most preferably at least 90% by weight , each based on the weight of the polymer outer layer, an LDPE. Polvmerzwischenschicht

If the polymer layer P is not the intermediate polymer layer, the intermediate polymer layer preferably contains a polyethylene or a polypropylene or both. A particularly preferred polyethylene is an LDPE. The intermediate polymer layer preferably contains the polyethylene or the polypropylene or both together in a proportion of at least 20% by weight, more preferably at least 30% by weight, more preferably at least 40% by weight, more preferably at least 50% by weight, more preferably at least 60 % By weight, more preferably at least 70% by weight, more preferably at least 80% by weight, most preferably at least 90% by weight, in each case based on the total weight of the polymer intermediate layer. Additionally or alternatively, the polymer intermediate layer preferably contains an HDPE, preferably in a proportion of at least 10% by weight, more preferably at least 20% by weight, more preferably at least 30% by weight, more preferably at least 40% by weight, more preferably at least 50% by weight %, more preferably at least 60% by weight, more preferably at least 70% by weight, more preferably at least 80% by weight, most preferably at least 90% by weight, in each case based on the total weight of the intermediate polymer layer. The polymer intermediate layer preferably contains the aforementioned polymers in a polymer blend.

barrier layer

Any material suitable for the purpose of the person skilled in the art, which has a sufficient barrier effect, in particular against oxygen, can be used as the barrier layer. For this purpose, the barrier layer preferably has an oxygen permeation rate of a few less than 50 cm ³ / (m ² · day · atm), preferably less than 40 cm ³ / (m ² · day · atm), more preferably less than 30 cm ³ / (m ² · day · atm), more preferably less than 20 cm ³ / (m ² · day · atm), more preferably less than 10 cm ³ / (m ² · day · atm), even more preferably less than 3 cm ³ / (m ² · day · atm), most preferably no more than 1 cm ³ / (m ² · day · atm).

The barrier layer is preferably selected from

If the barrier layer according to alternative a. a plastic barrier layer, this preferably contains at least 70% by weight, particularly preferably at least 80% by weight and most preferably at least 95% by weight of at least one plastic, which the person skilled in the art can use for this purpose, in particular because of the aroma or Gas barrier properties is known. Suitable plastics, in particular thermoplastic plastics, are N or O-bearing plastics, both individually and in mixtures of two or more. According to the invention, it can prove to be advantageous if the plastic barrier layer has a melting temperature in a range from more than 155 to 300 ° C., preferably in a range from 160 to 280 ° C. and particularly preferably in a range from 170 to 270 ° C.

The plastic barrier layer further preferably has a weight per unit area in a range from 2 to 120 g / m ² , preferably in a range from 3 to 60 g / m ² , particularly preferably in a range from 4 to 40 g / m ² and moreover preferably 6 to 30 g / m ² . The plastic barrier layer is furthermore preferably obtainable from melts, for example by extrusion, in particular layer extrusion. In addition, the plastic barrier layer can preferably also be introduced into the sheet-like composite via lamination. It is preferred here that a film is incorporated into the sheet-like composite. According to another embodiment, plastic barrier layers can also be selected, which can be obtained by deposition from a solution or dispersion of plastics. Suitable polymers are preferably those which have a molecular weight with a weight average, determined by gel permeation chromatography (GPC) by means of light scattering, in a range from 3 10 ³ to 1 10 ⁷ g / mol, preferably in a range from 5 10 ³ to 1.10 ⁶ g / mol and particularly preferably in a range from 6 10 ³ to 1 10 ⁵ g / mol. Suitable polymers are in particular polyamide (PA) or polyethylene vinyl alcohol (EVOH) or a mixture thereof.

Among the polyamides are all PA which appear suitable to the person skilled in the art for the use according to the invention. PA 6, PA 6.6, PA 6.10, PA 6.12, PA 11 or PA 12 or a mixture of at least two of these are particularly worthy of mention, PA 6 and PA 6.6 being particularly preferred and PA 6 also being preferred. PA 6 is commercially available, for example, under the trade names Akulon ^® , Durethan ^® and Ultramid ^® . Amorphous polyamides such as MXD6, Grivory ^® and Selar ^® PA are also suitable. It is further preferred that the PA has a density in a range from 1.01 to 1.40 g / cm ³ , preferably in a range from 1.05 to 1.30 g / cm ³ and particularly preferably in a range from 1 , 08 to 1.25 g / cm ³ . It is further preferred that the PA has a viscosity number in a range from 130 to 250 ml / g and preferably in a range from 140 to 220 ml / g.

Any EVOH which appears suitable to the person skilled in the art for the use according to the invention is suitable as EVOH. Examples of these are commercially available under the trade names EVAL ™ from EVAL Europe NV, Belgium in a variety of different versions, for example the types EVAL ™ F104B or EVAL ™ LR171B. Preferred EVOH have at least one, two, more or all of the following properties:

an ethylene content in a range from 20 to 60 mol%, preferably from 25 to 45 mol%

%; a density in a range from 1.0 to 1.4 g / cm ³ , preferably from 1.1 to 1.3 g / cm ³ ; a melting point in a range from more than 155 to 235 ° C, preferably from 165 to 225 ° C;

Preferably at least one polymer layer, more preferably the inner polymer layer, or preferably all polymer layers has a melting temperature below the melting temperature of the barrier layer. This applies in particular if the barrier layer is formed from polymer. Here, the melting temperatures of the at least one, in particular the polymer inner layer, and the melting temperature of the barrier layer preferably differ by at least 1 K, particularly preferably by at least 10 K, even more preferably by at least 50 K furthermore preferably at least 100 K. The temperature difference should preferably only be chosen so high that there is no melting of the barrier layer, in particular no melting of the plastic barrier layer, during the folding.

According to alternative b. the barrier layer is a metal layer. In principle, all layers with metals that are known to the person skilled in the art and can create a high impermeability to light and oxygen are suitable as the metal layer. According to a preferred embodiment, the metal layer can be present as a foil or as a deposited layer, for example after physical vapor deposition. The metal layer is preferably an uninterrupted layer. According to a further preferred embodiment, the metal layer has a thickness in a range from 3 to 20 mth, preferably in a range from 3.5 to 12 mth and particularly preferably in a range from 4 to 10 mth. Preferred metals are aluminum, iron or copper. A steel layer, for example in the form of a foil, may be preferred as the iron layer. The metal layer furthermore preferably represents a layer with aluminum. The aluminum layer can expediently consist of an aluminum alloy, for example AlFeMn, AlFel, 5Mn, AlFeSi or AlFeSiMn. The purity is usually 97.5% and higher, preferably 98.5% and higher, based in each case on the entire aluminum layer. In a special embodiment, the metal layer consists of an aluminum foil. Suitable aluminum foils have an extensibility of more than 1%, preferably more than 1.3% and particularly preferably more than 1.5%, and a tensile strength of more than 30 N / mm ² , preferably more than 40 N / mm ² and particularly preferably more than 50 N / mm ² . Suitable aluminum foils show a droplet size of more than 3 mm, preferably more than 4 mm and particularly preferably more than 5 mm in the pipette test. Suitable alloys for creating aluminum layers or foils are commercially available under the names EN AW 1200, EN AW 8079 or EN AW 8111 from Hydro Aluminum Deutschland GmbH or Amcor Flexibles Singen GmbH. In the case of a metal foil as a barrier layer, an adhesion promoter layer can be provided on one and / or both sides of the metal foil between the metal foil and a closest polymer layer.

It is also preferred that the barrier layer according to alternative c. a metal oxide layer may be selected. Suitable metal oxide layers are all metal oxide layers which are familiar to the person skilled in the art and which appear suitable in order to achieve a barrier effect against light, steam and / or gas. Metal oxide layers based on the previously mentioned metals aluminum, iron or copper are particularly preferred, as are metal oxide layers based on titanium or silicon oxide compounds. A metal oxide slide is produced, for example, by evaporating a plastic layer, for example an oriented polypropylene film with metal oxide. A preferred method for this is physical vapor deposition.

According to a further preferred embodiment, the metal layer or metal oxide layer can be a composite of one or more plastic layers with a metal or metal oxide layer. Such a layer can be obtained, for example, by evaporating a plastic layer, for example an oriented polypropylene film, with metal. A preferred method for this is physical vapor deposition. backing

Any material suitable for the purpose of the person skilled in the art which has sufficient strength and rigidity to give the container stability to the extent that the container essentially retains its shape when filled can be used as the carrier layer. This is in particular a necessary feature of the carrier layer, since the invention relates to the technical field of dimensionally stable containers. Such dimensionally stable containers are basically to be distinguished from bags and bags, which are usually made of thin foils. In addition to a number of plastics, plant-based fibrous materials, in particular cellulose, preferably glued, bleached and / or unbleached cellulose are preferred, paper and cardboard being particularly preferred. Accordingly, a preferred carrier layer contains a large number of fibers. The basis weight of the carrier layer is preferably in a range from 120 to 450 g / m ² , particularly preferably in a range from 130 to 400 g / m ² and most preferably in a range from 150 to 380 g / m ² . A preferred carton generally has a single or multi-layer structure and can be coated on one or both sides with one or more cover layers. Furthermore, a preferred cardboard has a residual moisture content of less than 20% by weight, preferably from 2 to 15% by weight and particularly preferably from 4 to 10% by weight, based on the total weight of the cardboard. A particularly preferred carton has a multilayer structure. Furthermore, the carton preferably has at least one, but particularly preferably at least two, layers of a cover layer on the surface facing the surroundings, which is known to the person skilled in the art as a “line”. Furthermore, a preferred cardboard has a Scott bond value (according to Tappi T403um) in a range from 100 to 360 J / m ² , preferably from 120 to 350 J / m ² and particularly preferably from 135 to 310 J / m ² . The areas mentioned above make it possible to provide a composite from which a container with high tightness can be folded easily and with low tolerances. The backing layer is characterized by a bending resistance, which can be measured with a bending measuring device according to ISO 2493-2: 2011 at a bending angle of 15 °. An L&W Bending Tester code 160 from Lorentzen & Wettre, Sweden is used as the bending measuring device. The carrier layer preferably has a bending resistance in a range from 80 to 550 mN in a first direction. In the case of a carrier layer which contains a multiplicity of fibers, the first direction is preferably an orientation direction of the fibers. A carrier layer, which contains a plurality of fibers, furthermore preferably has a bending resistance in a range from 20 to 300 mN in a second direction perpendicular to the first direction. The samples used to measure the bending resistance with the above measuring device have a width of 38 mm and a clamping length of 50 mm. A preferred sheet-like composite with the carrier layer has a bending resistance in the first direction in a range from 100 to 700 mN. Furthermore, the aforementioned sheet-like composite preferably has a bending resistance in the range from 50 to 500 mN in the second direction. The samples of the sheet-like composite used for measurement with the above measuring device also have a width of 38 mm and a clamping length of 50 mm.

outside

The outside of the sheet-like composite is a surface of a layer of the sheet-like composite which is intended to be in contact with the surroundings of the container in a container to be produced from the sheet-like composite. This does not conflict with the fact that in individual areas of the container the outer sides of different areas of the composite are folded onto one another or connected to one another, for example sealed onto one another. inside

The inside of the sheet-like composite is a surface of a layer of the sheet-like composite which is intended to be in contact with the contents of the container, preferably a foodstuff, in a container to be produced from the sheet-like composite. Polvolefin

A preferred polyolefin is a polyethylene (PE) or a polypropylene (PP) or both. A preferred polyethylene is one selected from the group consisting of an LDPE, an LLDPE, and an HDPE, or a combination of at least two of them. Another preferred polyolefin is an m polyolefin (polyolefin made by means of a metallocene catalyst). Suitable polyethylenes have a melt flow rate (MFI - melt flow rate) in a range from 1 to 25 g / 10 min, preferably in a range from 2 to 20 g / 10 min and particularly preferably in a range from 2.5 to 15 g / 10 min, and a density in a range from 0.910 g / cm ³ to 0.935 g / cm ³ , preferably in a range from 0.912 g / cm ³ to 0.932 g / cm ³ , and more preferably in one Range from 0.915 g / cm ³ to 0.930 g / cm ³ . mPolvmer

An mPolymer is a polymer that was produced using a metallocene catalyst. A metallocene is an organometallic compound in which a central metal atom is located between two organic ligands, such as cyclopentadienyl ligands. A preferred m-polymer is an m-polyolefin, preferably an m-polyethylene or an m-polypropylene or both. A preferred mPolyethylene is one selected from the group consisting of an mLDPE, an mLLDPE, and an mHDPE, or a combination of at least two of them.

Melting temperatures mPolyolefin

A preferred mPolyolefin is characterized by at least a first melting temperature and a second melting temperature. In addition to the first and the second melting temperature, the m polyolefin is preferably characterized by a third melting temperature. A preferred first melting temperature is in a range from 84 to 108 ° C, preferably from 89 to 103 ° C, more preferably from 94 to 98 ° C. A preferred further melting temperature lies in a range from 100 to 124 ° C., preferably from 105 to 119 ° C., more preferably from 110 to 114 ° C. Haftune / adhesion promoter layer

An adhesion promoter layer is a layer of the sheet-like composite which contains at least one adhesion promoter in a sufficient amount so that the adhesion promoter layer improves adhesion between layers adjacent to the adhesion promoter layer. For this purpose, the adhesion promoter layer preferably contains an adhesion promoter polymer. Accordingly, the adhesion promoter layers are preferably polymer layers. An adhesion promoter layer can be located between layers of the sheet-like composite which do not directly adjoin one another, preferably between the barrier layer and the polymer inner layer. Suitable adhesion promoters in an adhesion promoter layer are all plastics which, by functionalization by means of suitable functional groups, are suitable for producing a firm connection by forming ion bonds or covalent bonds to a surface of an adjacent layer. They are preferably functionalized polyolefins, in particular acrylic acid copolymers, which have been obtained by copolymerizing ethylene with acrylic acids such as acrylic acid, methacrylic acid, crotonic acid, acrylates, acrylate derivatives or carboxylic acid anhydrides bearing double bonds, for example maleic anhydride, or at least two of them. Among these, polyethylene len-maleic anhydride-grafted polymers (GUCH), ethylene acrylic acid copolymers (EAA) or ethylene-methacrylic acid copolymers (EMAA) are preferred, which ^®, for example, under the trade names Bynel ^® and Nucrel ^® 0609HSA by DuPont or Escor 6000Ex- Co are distributed by ExxonMobile Chemicals.

Ethylene-alkyl acrylate copolymers are also preferred as adhesion promoters. A methyl, ethyl, propyl, i-propyl, butyl, i-butyl or a pentyl group is preferably selected as the alkyl group. With further preference the adhesion promoter layer can comprise mixtures of two or more different ethylene-alkyl acrylate copolymers. The ethylene alkyl acrylate copolymer can also preferably have two or more different alkyl groups in the acrylate function, for example an ethylene alkyl acrylate copolymer in which both methyl acrylate units and ethyl acrylate units occur in the same copolymer. According to the invention, it is preferred that the adhesion between the carrier layer, a polymer layer or the barrier layer to the next layer in each case is at least 0.5 N / 15 mm, preferably at least 0.7 N / 15 mm and particularly preferably at least 0.8 N / 15 mm , In an embodiment according to the invention, it is preferred that the adhesion between a polymer layer and a carrier layer is at least 0.3 N / 15 mm, preferably at least 0.5 N / 15 mm and particularly preferably at least 0.7 N / 15 mm. It is further preferred that the adhesion between the barrier layer and a polymer layer is at least 0.8 N / 15 mm, preferably at least 1.0 N / 15 mm and particularly preferably at least 1.4 N / 15 mm. In the event that the barrier layer indirectly follows a polymer layer via an adhesion promoter layer, it is preferred that the adhesion between the barrier layer and the adhesion promoter layer is at least 1.8 N / 15 mm, preferably at least 2.2 N / 15 mm and particularly preferably at least 2 Is 8 N / 15mm. In a special embodiment, the adhesion between the individual layers is so strong that the backing layer is torn during the adhesion test, in the case of a box as a backing layer there is a so-called cardboard fiber tear.

Extrude / extruder

Within the scope of the inventors, any extruder that is known to the person skilled in the art and appears suitable for the use according to the invention can be considered as an extruder. An extruder is a device for molding a mass, preferably a polymer mass, by pressing through a shaping opening. A preferred extruder is a processing extruder or a processing extruder or both. Processing extruders are mainly used for shaping and are often designed as single-shaft exhausters. Processing extruders are used for chemical and / or physical modification of the mass by means of a chemical or physical process. A preferred chemical process is a chemical reaction. A preferred physical process is mixing or degassing or both. In connection with use 2 according to the invention and embodiment 5 of method 1 or 2, a preparation extruder is particularly preferred. In this context, a preferred chemical reaction as a chemical process is a chain extension reaction. A preferred extruder is selected from the group consisting of consisting of a piston extruder, a screw extruder, a cascade extruder, and a planetary roller extruder, or a combination of at least two of them. A preferred screw extruder is a barrier screw extruder, or a co-rotating or counter-rotating twin screw extruder. Another preferred extruder includes one, or two, or more than two shafts, each of these shafts carrying an extrusion tool, such as an extruder screw, or being integrally formed with the extrusion tool. In conjunction with use 2 according to the invention and embodiment 5 of process 1 or 2, a screw extruder, preferably a twin-screw extruder, more preferably a co-rotating twin-screw extruder, is very particularly preferred.

A melt extrusion coating is an application of a mass by pressing a melt forming the mass through a shaping opening of an extruder onto a substrate, so that a sheet-like layer overlying the substrate is obtained from the mass. In the case of a polymer composition P as a mass, the mass for extrusion coating is preferably melted. During the extrusion, the polymers are usually heated to temperatures of 210 to 350 ° C., measured on the melted polymer film below the outlet at the extruder nozzle. The extrusion can be carried out using commercially known extrusion tools, such as extruders, extruder screws, feed block etc. At the end of the extruder there is preferably an opening through which the polymer melt is pressed. The opening can have any shape that allows the polymer melt to be extruded. For example, the opening can be square, oval or round. The opening preferably has the shape of a slot in a funnel. After the melt layer has been applied to the substrate layer by the method described above, the melt layer is allowed to cool for the purpose of heat setting, which cooling is preferably accomplished by quenching through contact with a surface which is at a temperature in a range of 5 to 50 ° C, particularly preferably in a range from 10 to 30 ° C. Then at least the flanks are separated from the surface. The separation can be carried out in any manner familiar and suitable to the person skilled in the art in order to separate the flanks quickly, as accurately and cleanly as possible. The separation is preferably carried out by means of Knife, laser beam or water jet, or a combination of two or more thereof, the use of knives, in particular a potato, being particularly preferred.

conceal

According to the invention, the carrier layer can be overlaid with the barrier layer as a lamination. Here, the prefabricated carrier and barrier layers are connected with the aid of a suitable laminating agent. A preferred liner includes an intermediate polymer composition from which a preferred intermediate polymer layer is obtained.

colorants

Colorants which are known to the person skilled in the art and are suitable for the present invention are both solid and liquid. According to DIN 55943: 2001-10, colorant is the collective name for all coloring substances, especially for dyes and pigments. A preferred colorant is a pigment. A preferred pigment is an organic pigment. In connection with the invention, notable pigments are in particular those in DIN 55943: 2001-10 and those in “Industrial Organic Pigments, Third Edition.” (Willy Herbst, Klaus Hunger Copyright © 2004 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim ISBN: 3- 527-30576-9) mentioned pigments. A pigment is a colorant that is preferably insoluble in the application medium. A dye is a colorant that is preferably soluble in the application medium.

Folding the flat composite

The sheet-like composite is preferably folded in a temperature range from 10 to 50 ° C., preferably in a range from 15 to 45 ° C. and particularly preferably in a range from 20 to 40 ° C. This can be achieved in that the sheet-like composite has a temperature in the above areas. It is further preferred that a folding tool, preferably together with the sheet-like composite, has a temperature in the above range. For this purpose, the folding tool preferably does not have a heater. Rather, the folding tool or the sheet-like composite or both are cooled. Furthermore, it is preferred that the folding is carried out at a temperature of at most 50 ° C. as “cold folding” and the connection at more than 50 ° C., preferably above 80 ° C. and particularly preferably above 120 ° C. as “heat sealing”. The above conditions and in particular temperatures preferably also apply in the vicinity of the folding, for example in the housing of the folding tool.

According to the invention, "apply" is understood to mean a process in which an elongated, angle-forming crease is preferably created in the folded sheet-like composite by means of a folded edge of a folding tool. For this purpose, two adjoining surfaces of a sheet-like composite are often bent more and more towards one another The folding results in at least two adjoining folding surfaces which can then be connected at least in partial areas to form a container area. According to the invention, the connection can be carried out by any measure which seems suitable to the person skilled in the art and which enables a gas and liquid-tight connection as possible can be done by sealing or gluing or a combination of both measures. In the case of being sealed, the connection is created by means of a liquid and its solidification. In the case of gluing, the two are formed between the interfaces or surfaces n objects to be connected form chemical bonds that create the connection. It is often advantageous when sealing or gluing to press the surfaces to be sealed or glued together.

Connect

Any connection which appears suitable to the person skilled in the art for the use according to the invention and through which a sufficiently firm connection can be obtained can be considered as connection. A preferred joining is one selected from the group consisting of sealing, gluing, and pressing, or a combination of at least two of them. In the event of victory, the connection is created by means of a liquid and its solidification. In the case of gluing, chemical bonds are formed between the interfaces or surfaces of the two objects to be connected, which create the connection. Often, when sealing or gluing, it is advantageous to seal or glue Pressing surfaces together. A preferred pressing of two layers is pressing each first surface of a first of the two layers onto a second surface of the second of the two layers facing the first surface for at least 20%, preferably at least 30%, more preferably at least 40%, more preferably at least 50 %, more preferably at least 60%, more preferably at least 70%, even more preferably at least 80%, even more preferably at least 90%, most preferably at least 95% of the first surface. A particularly preferred joining is sealing. A preferred sealing comprises heating, stacking, and pressing as steps, the steps preferably taking place in this sequence. Another sequence is also conceivable, in particular the sequence stacking, heating and pressing. A preferred heating is heating a polymer layer, preferably a thermoplastic layer, more preferably a polyethylene layer or a polypropylene layer or both. Another preferred heating is heating a polyethylene layer to a temperature in a range of 80 to 140 ° C, more preferably 90 to 130 ° C, most preferably 100 to 120 ° C. Another preferred heating is heating a polypropylene layer to a temperature in a range from 120 to 200 ° C, more preferably from 130 to 180 ° C, most preferably from 140 to 170 ° C. Another preferred heating takes place to a sealing temperature of the polymer layer. A preferred heating can take place by radiation, by hot gas, by a solid heat contact, by mechanical vibrations, preferably by ultrasound, by convection, or by a combination of at least two of these measures. A particularly preferred heating takes place by exciting an ultrasonic vibration.

Irradiate

In the case of irradiation, any type of radiation suitable for the person skilled in the art to soften the plastics of the existing polymer layers is suitable. Preferred types of radiation are IR, UV rays and microwaves. In the case of IR rays, which are also used for IR welding of sheet-like composites, wavelength ranges from 0.7 to 5 gm are to be mentioned. Furthermore, laser beams in a wavelength range from 0.6 to less than 1.6 gm can be used. In connection with the use of IR rays, these are generated by various suitable emitters known to those skilled in the art. Short-wave emitters in the range from 1 to 1.6 gm are preferably halogen emitters. Medium-wave radiators in the range of> 1.6 to 3.5 gm are, for example, metal foil radiators. Quartz emitters are often used as long-wave emitters in the range> 3.5 gm. Lasers are being used more and more. Diode lasers in a wavelength range from 0.8 to 1 gm, Nd: YAG lasers at around 1 gm and CO2 lasers at around 10.6 gm are used. High-frequency technologies with a frequency range from 10 to 45 MHz, often in a power range from 0.1 to 100 kW, are also used. Ultrasonic

In the case of ultrasound, the following treatment parameters are preferred:

PI a frequency in a range from 5 to 100 kHz, preferably in a range from 10 to 50 kHz and particularly preferably in a range from 15 to 40 kHz;

P2 an amplitude in the range from 2 to 100 gm, preferably in a range from 5 to 70 gm and particularly preferably in a range from 10 to 50 gm;

P3 is an oscillation time (as a period in which a vibrating body, such as a sonotrode or inductor, has a vibrating contact on the sheet-like composite) in a range from 50 to 1000 ms, preferably in a range from 100 to 600 ms and particularly preferably in a range from 150 to 300 ms.

When selecting the appropriate radiation or vibration conditions, it is advantageous to take into account the natural resonances of the plastics and to select frequencies close to them.

Contact with a solid

Heating via contact with a solid can take place, for example, by means of a heating plate or heating mold which is in direct contact with the sheet-like composite and which releases the heat to the sheet-like composite. Heißeas

The hot gas, preferably hot air, can be directed onto the sheet-like composite by means of suitable blowers, outlet openings or nozzles or a combination thereof. Contact heating and hot gas are often used simultaneously. For example, a holding device for a container precursor formed from the sheet-like composite, through which hot gas flows and is thus heated and which releases the hot gas through suitable openings, can heat the sheet-like composite by contact with the wall of the holding device and the hot gas. Furthermore, the container precursor can also be heated in that the container precursor is fixed with a container precursor holder and the areas of the container precursor to be heated are flowed through by one or two or more hot gas nozzles provided in the container precursor holder.

food

The sheet-like composite and the container precursor in the context of the invention are preferably designed to produce a, preferably closed, food container. Furthermore, the container according to the invention is preferably a, preferably closed, food container. All foods known to the person skilled in the art for human consumption and also animal feed can be considered as foods. Preferred foods are liquid above 5 ° C., for example milk products, soups, sauces, non-carbonated drinks.

container precursor

A container precursor is a preliminary stage of the container that arises in the production of a, preferably, closed container. Here, the container precursor preferably contains the sheet-like composite as a blank. Here, the sheet-like composite can be unfolded or folded. A preferred container precursor is cut and designed to produce a single, preferably closed, container. A preferred container precursor, which is cut and designed to produce a single container, is also referred to as a jacket or sleeve. The jacket or sleeve contains the sheet-like composite folded. Furthermore, the container precursor preferably has the shape of a Lateral surface of a prism. A preferred prism is a cuboid. Furthermore, the jacket or sleeve contains a longitudinal seam and is open in a head region and a base region. A typical container precursor that is tailored and designed to make a variety of containers is often referred to as a hose.

Another preferred container precursor is open, preferably in one head region or one head region, particularly preferably in both. A preferred container precursor is jacket-shaped or tubular or both. Another preferred container precursor contains the sheet-like composite in such a way that the sheet-like composite is folded at least once, preferably at least twice, more preferably at least three times, most preferably at least four times. A preferred container precursor is formed in one piece. A base region of the container precursor is particularly preferably formed in one piece with a lateral region of the container precursor. container

The preferably closed container according to the invention can have a large number of different shapes, but an essentially cuboid structure is preferred. Furthermore, the container can be formed over the entire area from the sheet-like composite, or can have a 2-part or multi-part construction. In the case of a multi-part construction, it is conceivable that, in addition to the sheet-like composite, other materials are used, for example plastic, which can be used in particular in the top or bottom areas of the container. In this case, however, it is preferred that the container is made up of at least 50%, particularly preferably at least 70% and moreover preferably at least 90% of the area from the sheet-like composite. Furthermore, the container can have a device for emptying the contents. This can, for example, be formed from a polymer or a mixture of polymers and applied to the outside of the container. It is also conceivable that this device is integrated into the container by means of 'direct injection molding'. According to a preferred embodiment, the container according to the invention has at least one, preferably from 4 to 22 or even more edges, particularly preferably from 7 to 12 edges. Within the scope of the present invention, the edge understood rich that arise when folding a surface. The elongated contact areas of two wall surfaces of the container, also referred to herein as longitudinal edges, may be mentioned as exemplary edges. In the container, the container walls preferably represent the surfaces of the container framed by the edges. The interior of a container according to the invention preferably contains a food product. The container preferably does not contain a lid or base or both, which is not formed in one piece with the flat composite. A preferred container contains a food.

hole

The at least one hole provided in the carrier layer according to preferred embodiments can have any shape known to the person skilled in the art and suitable for various closures or drinking straws. In the context of the invention, a hole for the passage of a drinking straw is particularly preferred. The holes in the supervision often have curves. The holes can be essentially circular, oval, elliptical or drop-shaped. With the shape of the at least one hole in the carrier layer, the shape of the opening is usually also generated, either by an openable closure connected to the container, through which the container content is dispensed from the container after opening, or by a drinking straw in the container is predetermined. The openings of the opened container thus often have shapes which are comparable or even the same as the at least one hole in the carrier layer. Embodiments of the sheet-like composite with a single hole serve primarily to release the food contained in the container made from the sheet-like composite. Another hole can be provided in particular for ventilation of the container when the food is released. In connection with covering the at least one hole of the carrier layer, it is preferred that the hole cover layers are connected to one another at least partially, preferably at least 30%, preferably at least 70% and particularly preferably at least 90% of the area formed by the at least one hole. It is further preferred that the perforated cover layers are connected to one another at the edges of the at least one hole and preferably lie connected to the edges, so that they overlap one another entire hole surface extending connection to achieve improved tightness. The perforated cover layers are frequently connected to one another via the region formed by the at least one hole in the carrier layer. This leads to a good tightness of the container formed from the composite and thus to a desired high durability of the food stored in the container. The at least one hole preferably has a diameter in a range from 3 to 30 mm, more preferably from 3 to 25 mm, more preferably from 3 to 20 mm, more preferably from 3 to 15 mm, most preferably from 3 to 10 mm. Here, the diameter of the hole is the length of the longest straight line, which begins and ends at the edge of the hole and runs through the geometric center of gravity of the hole. open / opening aid

The opening of the container is usually created by at least partially destroying the perforated cover layers covering the at least one hole. This destruction can be done by cutting, pressing into or pulling out of the container. The destruction can take place by means of an opening aid connected to the container and arranged in the region of the at least one hole, usually above the at least one hole, for example also by means of a drinking straw which is pushed through the hole cover layers. Furthermore, in an embodiment according to the invention, it is preferred that an opening aid is provided in the area of the at least one hole. It is preferred here that the opening aid is provided on the surface of the composite that represents the outside of the container. Furthermore, the container preferably contains a closure, for example a lid, on the outside of the container. It is preferred that the closure covers the hole at least partially, preferably completely. The closure thus protects the hole cover layers, which are less robust compared to the areas outside the at least one hole, from harmful mechanical action. To open the hole cover layers covering the at least one hole, the closure often includes the opening aid. As such, hooks for tearing out at least some of the perforated cover layers, edges or cutting for cutting in the perforated cover layers or domes for pushing through the perforated cover layers or a combination of at least two of them are suitable, for example. These opening aids are often with a screw cap or a cap of the closure, for example mechanically coupled via a hinge, so that the opening aid acts on the perforated cover layers to open the closed container by actuating the screw cap or the cap. Occasionally, in the technical literature, such closure systems, comprising a composite layer covering a hole, openable closures covering this hole with opening aids are referred to as “overcoated holes” with “applied fittings”.

MEASUREMENT METHODS The following measurement methods were used within the scope of the invention. Unless otherwise stated, the measurements were carried out at an ambient temperature of 23 ° C, an ambient air pressure of 100 kPa (0.986 atm) and a relative humidity of 50%. Separate individual layers

If individual layers of a laminate - such as, for example, the polymer layer P, the barrier layer, the polymer outer layer, the polymer inner layer or the polymer intermediate layer - are to be examined here, the layer to be examined is first separated from the laminate as described below. Three sample pieces of the flat-shaped composite are cut. Unless otherwise specified, unfolded and non-grooved areas of the sheet-like composite are used for this. Unless otherwise stated, the sample pieces have the dimensions 4 cm x 4 cm. If other dimensions of the layer to be examined are necessary for the examination to be carried out, sufficiently large specimens are cut from the laminate. The sample pieces are placed for 30 minutes in an acetic acid bath heated to 60 ° C. (30% acetic acid solution: 30% by weight CH3COOH, remainder to 100% by weight H ₂ 0). This separates the layers from each other. If necessary, the layers can also be carefully peeled off from each other here. If the desired layer cannot be removed sufficiently well, new specimens are alternatively used and these are treated in an ethanol bath (99% ethanol) as described above. Are on the layer to be examined (both residues of the backing layer (especially in the case of a cardboard layer as backing layer), these are carefully removed with a brush. From the three foils prepared in this way, a sample is cut out with a size sufficient for the examination to be carried out (unless otherwise stated with an area of 4 cm ² ). These samples are then stored at 23 ° C for 4 hours and thus dried. The three samples can then be examined. Unless otherwise stated, the test result is the arithmetic mean of the results for the three samples. MFR

The MFR value is measured according to the standard ISO 1133-1: 2012, method A (mass determination method), unless otherwise stated at 190 ° C and 2.16 kg).

density

The density is measured according to the ISO 1183-1: 2013 standard.

melting temperature

The melting temperature is determined using the DSC method ISO 11357-1, -5. The device is calibrated according to the manufacturer's instructions using the following measurements:

- temperature indium - onset temperature,

- heat of fusion indium,

- Temperature zinc - Onset temperature.

The recorded measurement curve can have several local maxima (melting peaks), that is to say several melting temperatures. If a melting temperature above a certain value is required here, this condition is fulfilled if one of the measured melting temperatures lies above this value. If reference is made here to a melting temperature of a polymer layer, a polymer composition or a polymer, then in the case of a plurality of measured melting temperatures (melting peaks), unless stated otherwise, the highest melting temperature is always meant. Viscosity number of PA

The viscosity number of PA is measured according to the DIN EN ISO 307 (2013) standard in 95% sulfuric acid. Molecular weight distribution

The molecular weight distribution is measured by gel scattering chromatography using light scattering: ISO 16014-3 / -5 (2009-09).

Moisture content of the carton

The moisture content of the cardboard is measured according to the ISO 287: 2009 standard.

liability

To determine the adhesion of two adjacent layers, these are fixed on a 90 ° peel test device, for example from the Instron company "German rotating wheel fixture", on a rotatable roller that rotates at 40 mm / min during the measurement. The samples were previously cut into 15 mm wide strips. On one side of the sample, the layers are detached from one another and the detached end is clamped in a pulling device directed vertically upwards. A measuring device for determining the pulling force is attached to the pulling device. When the roller is turned, the force required to separate the layers from each other is measured. This force corresponds to the adhesion of the layers to each other and is given in N / 15 mm. The individual layers can be separated, for example mechanically, or by a specific pretreatment, for example by soaking the sample for 3 minutes in 30% acetic acid at 60 ° C. Detection of colorants

Detection of organic colorants can be carried out according to the methods described in "Industrial Organic Pigments, Third Edition." (Willy Herbst, Klaus Hunger Copyright © 2004 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim ISBN: 3-527-30576-9) be performed. Bio-based carbon content

Whether and to what extent the carbon content of the polymer P, the polymer layer P or the polymer composition P is bio-based is determined in accordance with the ASTM D6866-12 Method B standard.

Sauerstoffbermeationsrate

The oxygen permeation rate is determined according to ASTM D3985-05 (2010). Unless otherwise specified, the sample to be examined is taken from a non-grooved and unfolded area of the laminate. Furthermore, the sample to be examined is tested with the side facing outward in the laminate facing the test gas. The area of the sample is 50 cm ² . The measurements are carried out at an ambient temperature of 23 ° C, an ambient air pressure of 100 kPa (0.986 atm) and a relative air humidity of 50%. The test device is an Ox-Tran 2/22 from Mocon, Neuwied, Germany. The measurement is carried out without air pressure compensation. Samples with the ambient temperature are used for the measurements. Further settings and influencing factors for the measurement - in particular the others listed under point 16 of the standard ASTM D3985-05 (2010) - are specified by the measuring device used or the proper use and maintenance thereof in accordance with the manufacturer's manual. modulus of elasticity

The modulus of elasticity is determined by means of a tensile test with a Tira test 28025 universal tensile testing machine (Tira GmbH; Eisfelder Strasse 23/25; 96528 Schalkau, Germany; force transducer: 1 kN). For this purpose, the polymer layer to be examined is first separated from the composite as described above. Here 10 samples with the dimensions 15 mm x 40 mm are produced. 5 of the sample pieces are measured in the first layer direction and 5 in the further layer direction. For the respective measurement, the sample piece is clamped into the tensile testing machine in the layer direction to be examined. The test speed is Vl = 100 mm / min. For each layer direction, the arithmetic mean is formed from the values obtained for the 5 samples. The moduli of elasticity in the first layer direction and the further layer direction are obtained. Neck-In

In the case of melt extrusion coating with the polymer composition P, the neck-in value denotes the constriction of the polymer film formed by the polymer composition P between the extruder die outlet and the substrate, that is to say the sheet-like composite precursor, on each side of the film. The distance between the extruder nozzle outlet and the film is 15 cm for the measurement. The constriction is calculated from the difference between the nozzle width and the film width on the substrate, both in mm. The smaller the value, the easier it is to coat broad substrates and the production system can thus be used more effectively. To determine the neck-in value, the width of the film on the substrate is measured and calculated using the following formula: where a is the nozzle width in mm and b is the film width on the substrate in mm. The die width a here is the longest dimension of the extruder die slot.

Intrinsic viscosity

The intrinsic viscosity is determined in accordance with ASTM D4603-03.

shear viscosity

Detailed explanations of the theological methods can be found in "The Rheology Handbook: For Users of Rotational and Oscillatory Rheometers, 2nd revised edition" (ISBN 3-87870-174-8). The shear rheological measurements are carried out in oscillation tests with a Discovery HR-3 rheometer from TA Instruments with a plate-plate geometry with a diameter of 25 mm. If reference is made here to the shear viscosity of a polymer layer or a polymer composition, the dynamic shear viscosity which can be measured by means of plate-plate geometry is always meant. Determination of the shear viscosity of the polyethylene terephthalate or its derivatives: First the sample is conditioned in the measuring device. For this purpose, the sample is melted for 5 min at the measuring temperature (BioPET: 270 ° C; rPET at 260 ° C) and a plate spacing of 1750 pm and then the supernatant that has swollen between the plates is removed. The sample height (measuring gap) during the measurement is 1700 pm. First, an amplitude sweep is carried out with a step-wise increase in the deformation from 0.1% to 100% and at a constant angular frequency of 0.2 rad / s in order to determine the linear viscoelastic range (LVE). In this area, the theological properties are independent of the deformation, so that a deformation suitable for the frequency sweep can be determined. The frequency sweep is then followed at a deformation of 4% and an angular frequency range from 0.1 to 100 rad / s.

Determination of the shear viscosity of polylactic acid or its derivatives:

First the sample is conditioned in the measuring device. For this purpose, the sample is melted for 5 min at the measuring temperature of 195 ° C and a plate spacing of 1750 pm and then the supernatant that has swollen between the plates is removed. The sample height (measuring gap) during the measurement is 1700 pm. First, an amplitude sweep is carried out with a step-wise increase in the deformation from 0.1% to 100% and at a constant angular frequency of 0.2 rad / s in order to determine the linear viscoelastic range (LVE). In this area, the theological properties are independent of the deformation, so that a deformation suitable for the frequency sweep can be determined. The frequency sweep is then followed with a deformation of 1% and an angular frequency range from 0.1 to 100 rad / s.

Three samples are measured to ensure the reproducibility of the tests. tightness

Crystal Chemical Oil 60 from Shell Chemicals with methylene blue is used as a test agent for the leak test. For this test, 250 containers are produced from the laminate to be examined and sealed as described below for the examples and comparative examples. The closed containers are then cut open along their circumference in such a way that an upwardly open container part containing the closed base area is obtained. This part of the container is filled with approx. 20 ml of the test agent and stored for 24 hours. After the storage period, the container parts on the outside of the floor area are then checked with the naked eye as to whether the test agent has produced blue discoloration in the event of a leak in the floor area. As a result of the test, the number of the same 250 containers is shown, which show a leak after 24 hours.

Resistance to ambient humidity

The resistance of the containers to ambient humidity is tested by means of a compression test. For this test, 5 identical containers as described below for the examples and comparative examples are produced, filled with water and sealed. The containers are then stored for 24 hours at a relative air humidity of 50% at a temperature of 23 ° C ° C. Then the compression test is carried out immediately. The test is used to determine the crushing resistance along the longitudinal axis of the closed container and can be used to evaluate the load-bearing capacity of filled containers in the static case of storage and in the dynamic case of transport. The compression pressure test is carried out on the individual containers in accordance with DIN EN ISO 12048. A TIRAtest 28025 (Tira GmbH; Eisfelder Strasse 23/25; 96528 Schalkau, Germany) is used as the measuring device. The average of the maximum breaking load (load value) from the 5 same containers is determined. This describes the value that leads to the failure of the examined containers.

Adhesion strength color

Under the adhesive strength of a color layer, a resistance of the color layer to the forces occurring when an adhesive strip is torn off from the surface of the color layer Roger that. In the test, adhesive tape type 4104, 20 mm wide from the manufacturer Beiersdorf AG, Hamburg, is used. The sample to be tested is placed with the colored layer on top on a hard, smooth and flat surface. For each test run, a strip of test tape 4104 is glued to the outer layer at least over a length of 30 mm and pressed evenly with the thumb. The test is carried out within 30 seconds after the adhesive tape has been attached. Longer dwell times on the outer layer can lead to different results. The test takes place in either

a) The adhesive strip is pulled off suddenly at an angle of 90 °, or

b) The adhesive strip is peeled off slowly and peeling (at an angle of less than 45 ° to the color layer).

For both test types a) and b), 3 test runs are carried out at different points in the paint layer. The results are assessed with the naked eye using the following scale. The results get better from 1 to 5: 5 - color layer does not peel off

4 - Color layer peels off at individual points

3 - Color layer peels off clearly in individual places

2 - Paint layer peels off in larger areas

1 - Color layer peels off completely, based on the area of the adhesive strip

From these 6 results, the arithmetic mean is formed, which corresponds to the result of the measurement.

printability

The printability of the polymer outer layer is evaluated by determining the dots of the printing screen that were not printed when the decor was printed using the gravure printing process. For this purpose, the printed decor is examined under the light microscope. Five full-surface areas of the laminate to be examined with a size of 10 mm x 10 mm are examined. A non-printed dot of the print screen corresponds to a missing screen dot. The missing grid points are counted for each of the five areas. The arithmetic mean (average value) of the five measurements corresponds to the value “missing grid points”. The higher this value, the poorer the printability of the outer polymer layer of the laminate.

Stress corrosion cracking

15 non-grooved and unfolded laminate samples are cut to the dimensions of 68 mm x 38 mm. Here, the cut is made so that the length of 68 mm is oriented perpendicular to the cardboard fiber erection. The samples are folded once so that the outer

Decorative layer comes to lie on itself. Folded in this way, the samples are fixed with a paper clip and immersed in 100% detergent (Pricol perfect from Henkel, Düsseldorf, Germany) for up to a week. The samples are immersed 15 mm deep in the detergent. 5 of the samples are checked for stress cracks under a stereomicroscope after 24 h, 48 h and 7 days. Stress cracks are evident from the fact that changes in the form of cracks, hairline cracks or splinters can be seen on the still folded sample in the area of the fold on the side of the laminate facing away from the decorative layer (stretched area). The evaluation is based on the following scale. 3 - no stress cracks after 7 days

2 - after 48 h stress cracks

1 - after 24 h stress cracks öffhungstest

As described below for the examples and comparative examples, the carrier layer was provided with a hole to which an opening aid in accordance with EP1 812 298 B1 was applied. This opens the container according to paragraph [0002] with a pushing-in and cutting movement through the membrane spanning the hole. With optimal function, approx. 90% of the radius of the membrane specified by the cutting ring is cut through and there is only one connection to the container. The membrane folds away to the side and the product can be poured out without interference. If the material is not selected according to the invention, restrictions can arise when opening the container. It means:

Poor opening behavior can mean a high effort, a not completely cut membrane or threads and noses due to stretched polymer layers.

Biodegradability

The biodegradability is tested according to the DIN EN 13432 standard. According to this standard, biodegradability means that a material must have decomposed to more than 90% water, carbon dioxide (COa) and biomass after a specified time under defined temperature, oxygen and humidity conditions in the presence of microorganisms or fungi. The invention is illustrated in more detail below by examples and drawings, the examples and drawings not restricting the invention. Furthermore, the drawings are not to scale unless otherwise stated. Production of treated bio-polvestems from untreated bio-polvestems as base polymers

Table 1: untreated bio-polyesters, which are used as base polymers in the examples and comparative examples and for which chain modifiers suitable for treatment with their dosage in% by weight, based on the weight of the mixture of base polymer and chain modifier, and also the temperature used to extrude the treated polyester obtained

From the untreated bio-polyesters (base polymers) specified in table 1, bio-polyesters treated for the use according to the invention are produced by treatment with the chain modifier specified in each case in the dosage also specified. This treatment takes place in the extrusion coating system used for the production of the laminates. For this purpose, the base polymer and chain modifier are added to the extruder and the extrusion is carried out at the temperature listed in Table 1. The treated polyester thus obtained is granulated and is thus available for the melt extrusion coating described below for the production of the laminates. This extrusion coating is also carried out when using one of the treated polyesters obtained as described above with the extrusion temperature given in Table 1. If the above base polymers are used without prior treatment with a chain modifier (comparative examples), they are each referred to as “untreated”. The Base polymers treated with the corresponding chain modifier given above are referred to as “treated”.

Furthermore, in the evaluations below, "++" always means a more advantageous result than "+", "+" a more advantageous result than and a more advantageous result than

Polymer layer P as a polymer outer layer

In Examples 1 to 8 (according to the invention) and Comparative Examples 1 to 11 (not according to the invention), the layer referred to herein as polymer layer P is used as the polymer outer layer. Here, the polymer layer P corresponds only to the inventive examples of the invention.

Laminataufhau

For the examples (according to the invention) and comparative examples (not according to the invention) in which the polymer layer P is used as the outer polymer layer, laminates with the layer structure given in Table 2 below are each prepared by a layer extrusion process.

Table 2: Structure of the laminates of the examples and the comparative examples in which the polymer layer P is used as the polymer outer layer Composition of the outer polymer layer

Table 3 shows the compositions of the polymer layer P and of the polymer composition P from which the polymer layer P is obtained for each example and comparative example in which the polymer layer P is used as the polymer outer layer.

Table 3: Composition of the polymer layer P in the laminates of the examples and the comparative examples, in which the polymer layer P is used as the outer polymer layer

laminate production

The laminates are produced using an extrusion coating system from Davis Standard. Unless otherwise stated for the purpose of treatment with the chain modifier, the extrusion temperature is in a range from about 280 to 330 ° C. In the first step, the carrier layer is provided with a pouring hole for each container to be produced, and then the polymer outer layer is applied to the carrier layer. In the second step, the polymer intermediate layer is applied together with the adjacent adhesion promoter layer and the barrier layer to the carrier layer previously coated with the polymer outer layer. In the last step, the inner polymer layer is applied to the barrier layer together with the adjacent adhesion promoter layer. To apply the individual layers, the polymers or polymer blends are melted in an extruder. When a polymer or polymer blend is applied in one layer, the resulting melt is transferred to a nozzle via a feed block and extruded onto the carrier layer. If several polymers or polymer blends are applied in one layer, the melts formed are brought together via a feed block and then extruded together on the carrier layer. According to the methods given above, the MFR or the intrinsic viscosity of the polymer composition P used to produce the polymer outer layer and its neck-in during melt extrusion coating are determined. Furthermore, the so-called edge waving of the polymer composition P during melt extrusion coating is evaluated. The less pronounced this phenomenon occurs, the more advantageous since a smoother and more homogeneous polymer outer layer is obtained over the substrate surface. If the edge waving is too pronounced, the neck-in cannot be sensibly determined. The results of the above investigations on the processability of the polymer compositions P of the examples and comparative examples are summarized in Table 4.

Table 4: Properties for processability of the polymer compositions P of the examples and comparative examples, in which the polymer layer P is used as the outer polymer layer, by means of melt extrusion coating. Samples of the outer polymer layer are separated as described above from the laminates of the examples and comparative examples produced and their ratio of the first E-module in the first layer direction to the further E-module in the further layer direction determined according to the above measurement method. When determining the modulus of elasticity, the first layer direction is always selected so that it matches the direction of travel (MD) of the extrusion coating. Accordingly, the further layer direction is chosen so that it coincides with the transverse direction (CD). The results of the above tests are given in Table 5.

Table 5: Theological properties of the polymer layers P of the laminates of the examples and of the comparative examples in which the polymer layer P is used as the polymer outer layer. Significant aspects of the environmental compatibility of a laminate and the containers produced therefrom are the production of the materials used for producing the laminate, but also that Usability of these materials after disposal of the containers. Herein the bio-based carbon fraction of the polymer layer P is used as a measure of the proportion to which the polymer or the polymers of the respective polymer layer P are made from renewable raw materials was obtained, that is, a measure of the environmental compatibility of the production of the polymer or polymers used. The bio-based carbon content is determined after separating the polymer layer P from the laminate according to the method described above. In order to assess environmental compatibility, the usability of the polymers used after the container has been used must also be considered. Environmentally compatible recycling can be achieved by biodegrading the material or by chemical recycling. Biodegradability is tested according to the measurement method given above. Chemical recyclability means that the material can be broken down chemically into its individual components so that they are available for the production of a new material by means of polymerisation. Results on the 3 aspects of the environmental compatibility of the polymer layers P of the laminates of the examples and comparative examples discussed above with the polymer layer P as the polymer outer layer are summarized in Table 6 below. Furthermore, the laminates of the examples and comparative examples produced as described above are printed with a decor on the outer polymer layer using the gravure printing process. A decor with 60 halftone dots per cm and an area coverage of 30% is used for this. Before printing, the polymer outer layer to be printed is not subjected to any treatment to improve the ink adhesion, such as a corona treatment. The tests given above for the adhesive strength of the ink and the printability (lack of halftone dots) of the polymer outer layer are carried out on the printed laminates. The results of these tests are also shown in Table 6.

container production

In the printed laminates obtained as described above, creases, in particular longitudinal creases, are introduced on the outside (side of the polymer outer layer). A crease pattern is introduced for each container to be made from the laminate. Furthermore, the grooved laminate is cut into blanks for individual containers, each blank containing one of the above holes. By folding along the 4 longitudinal grooves of each blank and sealing overlapping folding surfaces by heat input, a jacket-shaped container precursor of the shape shown in FIG. 5 with a longitudinal seam is obtained in each case. A closed container of the shape shown in FIG. 7 (brick type) is produced from this jacket in a standard filling machine CFA 712, SIG Combibloc, Linnich. Here, a floor area is created by folding and closed by heat sealing. This creates an open cup. The cup is sterilized with hydrogen peroxide. The cup is also filled with water. The head area of the cup, which contains the hole, is closed by folding and ultrasound sealing, and a closed container is thus obtained. An opening aid of the type disclosed in EP1 812 298 B1 is glued to this container with an adhesive Euromelt 510 from Henkel, Dusseldorf. The containers obtained are tested for their resistance to ambient moisture in accordance with the method given above and subjected to the opening test described above. The results of these tests are shown in Table 7.

Comparative Example 6 91

Example 3 133 +

Example 4 140 +

Comparative Example 7 90

Comparative Example 8 60

Comparative Example 9 96

Example 5 129 +

Example 6 139 +

Comparative Example 10 54

Comparative Example 11 102

Example 7 133 +

Example 8 145 +

Table 7: Properties of the containers produced from laminates according to the examples and comparative examples with polymer layer P as the polymer outer layer

Polymer layer P as a polymer intermediate layer

In Examples 9 to 16 (according to the invention) and Comparative Examples 12 to 22 (not according to the invention), the layer referred to herein as polymer layer P is used as an intermediate polymer layer. Here, the polymer layer P corresponds only to the inventive examples of the invention.

laminate structure

For the examples (according to the invention) and comparative examples (not according to the invention) in which the polymer layer P is used as an intermediate polymer layer, laminates with the layer structure given in Table 8 below are prepared in each case by a layer extrusion process.

Table 8: Structure of the laminates of the examples and the comparative examples in which the polymer layer P is used as an intermediate polymer layer

Composition of the interlayer

For each example and comparative example in which the polymer layer P is used as an intermediate polymer layer, the compositions of the polymer layer P or the polymer composition P from which the polymer layer P is obtained are shown in Table 9. Polymer layer P / polymer composition P

Comparison 100% by weight of untreated LDPE 19N430 from Ineos GmbH, Cologne, German example 12 country

Comparative 100% by weight of untreated Braskem LD4000A (LDPE) from Braskem example 13

Comparative 100 wt% untreated Ingeo 4044D (PLA) from Nature Works example 14

Comparative 50 wt% untreated and 50 wt% treated Ingeo 4044D (PLA) example 15 from Nature Works

Example 9 30% by weight untreated and 70% by weight treated Ingeo 4044D (PLA) from Nature Works

Example 10 100% by weight Ingeo 4044D (PLA) from Nature Works

Comparative 100% by weight untreated Biomer B300 (PHB) from Biomer

example 16

Comparative 50 wt% untreated and 50 wt% treated Biomer B300 (PHB) example 17 from Biomer

Example 11 30% by weight untreated and 70% by weight treated Biomer B300 (PHB) from Biomer

Example 12 100% by weight treated Biomer B300 (PHB) from Biomer

Comparative 100% by weight of untreated DSM Amite ^® A02 307 (PET)

example 18

Vergleichs100 wt .-% untreated GLOBIO BCB80 ^® (PET), FKUR

example 19

Vergleichs50 wt .-% untreated and 50 wt .-% of treated GLOBIO ^® BCB80 Example 20 (PET), FKUR

Example 13 30 wt .-% untreated and 70 wt .-% of treated GLOBIO ^® BCB80

(PET), FKUR

Example 14 100 weight .-% of treated GLOBIO BCB80 ^® (PET), FKUR

Table 9: Composition of the polymer layer P in the laminates of the examples and the comparative examples, in which the polymer layer P is used as an intermediate polymer layer

laminate production

The laminates are produced as described above for the examples and comparative examples with the polymer layer P as the polymer outer layer. Here, too, the MFR or the intrinsic viscosity of the polymer composition P used to produce the polymer layer P (here polymer intermediate layer) and its neck-in during melt extrusion coating are determined in accordance with the methods given above. In addition, the so-called edge waving of the polymer composition P during melt extrusion coating is evaluated. The results of the above investigations on the processability of the polymer compositions P of the examples and comparative examples are summarized in Table 10.

example 13

Comparative not 3

Table 10: Egg

le and comparative examples in which the polymer layer P is used as an intermediate polymer layer by means of melt extrusion coating Samples of the polymer intermediate layer are separated from the laminates of the examples and comparative examples produced as described above and their ratio of the first E-module in the first layer direction to the further E-module in the further layer direction is determined by the above measurement method. When determining the modulus of elasticity, the first layer direction is always selected so that it matches the direction of travel (MD) of the extrusion coating. Accordingly, the further layer direction is chosen so that it coincides with the transverse direction (CD). The results of the above tests are given in Table 11.

Table 11: Theological properties of the polymer layers P of the laminates of the examples and the comparative examples, in which the polymer layer P is used as the polymer outer layer. The laminates of the examples and comparative examples produced as described above are examined with regard to the adhesion between their barrier layer and their carrier layer in accordance with the above measurement method , Furthermore, samples of the polymer interlayer are separated and the bio-based carbon content of the polymer interlayer is determined therefrom. The results of the above tests are given in Table 12. Table 12 also contains information on the biodegradability and chemical recyclability of the polymer layer P.

container production

As described above for the examples and comparative examples, closed containers are produced with the polymer layer P as the polymer outer layer. The containers obtained are tested for leaks in accordance with the method given above and subjected to the opening test described above. The results of these investigations are listed in Table 13.

Table 13: Properties of the containers produced from laminates according to the examples and comparative examples with polymer layer P as polymer intermediate layer Polymer layer P as inner polymer layer

In Examples 17 to 24 (according to the invention) and Comparative Examples 23 to 33 (not according to the invention), the layer referred to herein as polymer layer P is used as the polymer inner layer. Here, the polymer layer P corresponds only to the examples of the invention.

laminate structure

For the examples (according to the invention) and comparative examples (not according to the invention) in which the polymer layer P is used as the inner polymer layer, laminates with the layer structure given in Table 14 below are each prepared by a layer extrusion process.

Table 14: Structure of the laminates of the examples and the comparative examples in which the polymer layer P is used as the inner polymer layer

Composition of the inner polymer layer

Table 15 shows the compositions of the polymer layer P and of the polymer composition P from which the polymer layer P is obtained for each example and comparative example in which the polymer layer P is used as the inner polymer layer.

Table 15: Composition of the polymer layer P in the laminates of the examples and the comparative examples, in which the polymer layer P is used as the inner polymer layer

laminate production

The laminates are produced as described above for the examples and comparative examples with the polymer layer P as the polymer outer layer. Here, too, the MFR or the intrinsic viscosity of the polymer composition P used to produce the polymer layer P (here the inner polymer layer) and their neck-in during melt extrusion coating are determined in accordance with the methods given above. Furthermore, the so-called edge waving of the polymer composition P during melt extrusion coating is evaluated. The results of the above investigations on the processability of the polymer compositions P of the examples and comparative examples are summarized in Table 16.

Table 16: Egg

oils and comparative examples in which the polymer layer P is used as the inner polymer layer by means of melt extrusion coating Samples of the polymer intermediate layer are separated from the laminates of the examples and comparative examples produced as described above and their ratio of the first E-module in the first layer direction to the further E-module in the further layer direction is determined by the above measurement method. When determining the modulus of elasticity, the first layer direction is always selected so that it coincides with the running direction (MD) of the extrusion coating. Accordingly, the further layer direction is chosen so that it coincides with the transverse direction (CD). The results of the above tests are given in Table 17.

Table 17: Theological properties of the polymer layers P of the laminates of the examples and the comparative examples in which the polymer layer P is used as the polymer outer layer. Furthermore, the laminates of the examples and comparative examples produced as described above are examined with regard to their tendency to stress corrosion cracking according to the above measurement method. In addition, samples of the inner polymer layer are separated and the bio-based carbon content of the inner polymer layer is determined. The results of the above tests are given in Table 18. Table 18 also contains information on the biodegradability and chemical recyclability of the polymer layer P.

container production

As described above for the examples and comparative examples, closed containers are produced with the polymer layer P as the polymer outer layer. The containers obtained are tested for leaks in accordance with the method given above and subjected to the opening test described above. The results of these investigations are listed in Table 19.

Table 19: Properties of the containers produced from laminates according to the examples and comparative examples with polymer layer P as the inner polymer layer Unless otherwise stated in the description or the respective figure, each shows schematically and not to scale:

Figure 1 is a schematic representation of a section of a sheet-like composite according to the invention in cross section;

Figure 2 is a schematic representation of a section of a further sheet-like composite according to the invention in cross section;

FIG. 3 shows a flow chart of a method according to the invention for producing a flat composite;

FIG. 4 shows a flow chart of a method according to the invention for producing a container precursor;

Figure 5 is a schematic representation of a container precursor according to the invention; FIG. 6 shows a flow chart of a method according to the invention for producing a closed container;

Figure 7 is a schematic representation of a closed container according to the invention; and

FIG. 8 shows a diagram of the dependence of the shear viscosity of the polymer layer P on the shear frequency for the polymer layers P of examples 6, 14 and 22 and comparative examples 8, 19 and 30.

Figure 1 shows a schematic representation of a section of a sheet-like composite 100 according to the invention in cross section. The sheet-like composite 100 consists of the following layers of a layer sequence in the direction from an outside 101 of the sheet-like composite 100 to an inside 102 of the sheet-like composite 100: an outer polymer layer 103, a carrier layer 104, a barrier layer 105 and a polymer inner layer 106 Backing layer 104 is a cardboard layer called Stora Enso Natura T Duplex with double line (Scott Bond value 200 J / m ² , residual moisture 7.5%). The barrier layer 105 is made of EVOH, available as EVAL L171B from Kuraray, Düsseldorf, Germany. The polymer outer layer 103 and / or the polymer inner layer 106 can be used as polymer layer P described herein may be formed. Each polymer layer P contains a polyester. In addition, each polymer layer P extends flat in a respective layer plane and has a first modulus of elasticity in a first layer direction lying in the layer plane, and a further modulus of elasticity in a further layer direction lying in the layer plane. In any case, the first layer direction and the corresponding further layer direction are perpendicular to each other. Furthermore, a ratio of the first elastic modulus to the further elastic modulus is in a range from 0.96 to 1.04. If the polymer outer layer 103 is not a polymer layer P, it consists of the LDPE 19N430 from Ineos GmbH, Cologne, Germany. If the inner polymer layer 106 is not a polymer layer P, it consists of a blend of 65% by weight LDPE 19N430 from Ineos GmbH, Cologne, Germany and 35% by weight Eltex 1315 AZ from Ineos GmbH, Cologne, Germany.

FIG. 2 shows a schematic illustration of a section of a further sheet-like composite 100 according to the invention in cross section. The sheet-like composite 100 consists of the following layers of a layer sequence in the direction from an outer side 101 of the sheet-like composite 100 to an inner side 102 of the sheet-like composite 100: a paint application 201, which forms a four-colored decor, a polymer outer layer 103, a carrier layer 104, one Intermediate polymer layer 202, a first adhesion promoter layer 203, a barrier layer 105, a second adhesion promoter layer 204, and a polymer inner layer 106. The carrier layer 104 is a cardboard layer with the designation Stora Enso Natura T Duplex with double line (Scott bond value 200 J / m ² , residual moisture 7.5%). The barrier layer 105 is an aluminum foil with the designation EN AW 8079 from Hydro Aluminum Deutschland GmbH. Any one or more selected from the group consisting of the outer polymer layer 103, the intermediate polymer layer 202 and the inner polymer layer 106 can be formed as the polymer layer P described herein. Here the polymer layer P consists of a polyester which is obtained by treating one of the base polymers specified in Table 1 with the chain modifier specified for this purpose. If the polymer outer layer 103 is not a polymer layer P, it consists of the LDPE 19N430 from Ineos GmbH, Cologne, Germany. The polymer intermediate layer 202, in the case in which it is not a polymer layer P, consists of the LDPE 19N430 from Ineos GmbH, Cologne, Germany. The The first adhesion promoter layer 203 and the second polymer layer 204 each consist of the EAA Escor 6000 from Exxon Mobile Corporation. If the inner polymer layer 106 is not a polymer layer P, it consists of the following three sub-layers in the direction from the barrier layer 106 to the inside 102: a first sub-layer made of 75% by weight HDPE and 25% by weight LDPE, each based on the total weight of the first Underlayer, a second sublayer made of 100% by weight of LDPE based on the total weight of the second sublayer, and a third sublayer made of a polymer blend, the polymer blend comprising 30% by weight of an mPE and 70% by weight of an LDPE each based on the total weight of the third sub-layer.

FIG. 3 shows a flowchart of a method 300 according to the invention for producing a flat composite 100. In a method step a) 301, a flat composite precursor is provided. This includes a carrier layer 104. Furthermore, a polymer composition P, including a polyester, is provided. In a method step b) 302, the carrier layer 104 is overlaid with the polymer composition P by means of layer extrusion. Accordingly, the polymer composition P is liquid when superimposed. The extrusion coating produces a polymer layer P made of the polymer composition P and overlying the carrier layer 104. This polymer layer P extends in a plane in a layer plane. In a direction lying in the layer plane in which the layer extrusion took place (machine direction), the polymer layer P has a first modulus of elasticity. The polymer layer P has a further modulus of elasticity in a further layer direction, which is also in the layer plane and is perpendicular to the machine direction. A ratio of the first modulus of elasticity to the further modulus of elasticity is

1.02.

FIG. 4 shows a flow diagram of a method 400 according to the invention for producing a container precursor 500. In a method step a. 401, a cut of the flat composite 100 of FIG. 2 is provided. This blank includes a first longitudinal edge and a further longitudinal edge. In a process step b. 402 the blank is folded. In a process step c. 403 become the first longitudinal edge and the further Longitudinal edge pressed together and bonded together by heat sealing. A longitudinal seam 502 is thus obtained. According to what has been described above, the container precursor 500 according to FIG. 5 is produced. FIG. 5 shows a schematic representation of a container precursor 500 according to the invention. The container precursor 500 includes a cut of the flat composite 100 of FIG. 1 with 4 longitudinal folds 501, each of which forms a longitudinal edge 501. In the container precursor 500, the outside 101 of the sheet-like composite 100 points outwards. The container precursor 500 is jacket-shaped and contains a longitudinal seam 502 in which a first longitudinal edge and a further longitudinal edge of the sheet-like composite 100 are sealed to one another. Furthermore, the container precursor 500 includes a hole 505 in the carrier layer 104. The hole 505 is covered with the polymer outer layer 103 (not shown), the polymer intermediate layer 202 (not shown), the barrier layer 105, and the polymer inner layer 106 (not shown) as hole cover layers. A closed container 700 can be obtained by folding along grooves 506 and connecting fold regions in a head region 503 and a bottom region 504 of the container precursor 500. Such a closed container 700 is shown in FIG. 7.

FIG. 6 shows a flowchart of a method 600 according to the invention for producing a closed container 700. In method step A. 601, the container precursor 500 according to FIG. 5 is provided. In a method step B. 602, a bottom area 504 of the container precursor 500 is formed by folding the sheet-like composite 100. In a process step C. 603, the bottom area 504 is closed by sealing with hot air at a temperature of 300 ° C. In a process step D. 604, the container precursor 500 is filled with a food 701 and in a process step E. 605 the container precursor 500 is sealed in a head region 503 while maintaining the closed container 700 of FIG. 7. In a process step F. 606, the closed container 700 is connected to an opening aid 702. FIG. 7 shows a schematic illustration of a closed container 700 according to the invention. The closed container 700 was produced from the container precursor 500 according to FIG. The closed container 700 contains a food 701 and has 12 edges 501. Furthermore, the closed container 700 is connected to a lid with an opening aid 702, which has the hole 505 on the outside 101 of the sheet-like composite

100 covered. Here, the cover 702 contains a cutting tool in its interior as an opening aid.

FIG. 8 shows a diagram of the dependence of the shear viscosity in Pa s 802 of the polymer layer P on the shear frequency in rad / s 801 for the polymer layers P of examples 6, 14 and 22 and comparative examples 8, 19 and 30 described measurement method obtained measurement results for Globio ^® BCB80, FKUR 807 treated as described above for the examples, and measurement results for untreated Globio ^® BCB80, FKUR 808. For the measurement curve 807 of the polymer layer P according to the invention made of treated Globio ^® BCB80, the diagram also shows the first shear viscosity 805 at the first shear frequency 803 and the further shear viscosity 806 at the further shear frequency 804. It can be clearly seen that curve 807 shows a significantly greater shear thinning than curve 808 in the range from the first shear frequency 803 of 0.1 rad / s to the further shear frequency 804 of 100 rad / s. Furthermore, curve 807 in this area is a non-linear, strictly monotonically falling curve, the slope of which decreases.

Claims

1. A sheet-like composite (100), comprising as superimposed layers in the direction from an outside (101) of the sheet-like composite (100) to an inside (102) of the sheet-like composite (100)

a) a carrier layer (104), and

b) a barrier layer (105),

wherein the sheet-like composite (100) additionally contains a polymer layer P, the polymer layer P

a. contains a polyester,

b. extends in a layered plane,

wherein a ratio of the first modulus of elasticity to the further modulus of elasticity is in a range from 0.81 to 1.19.

2. The sheet-like composite (100) according to claim 1, wherein the polymer layer P has a melting temperature of more than 145 ° C.

3. The sheet-like composite (100) according to claim 1 or 2, wherein the polymer layer P has a density of more than 1.1 g / cm ³ .

4. A method (300) including as method steps

a) Provide

i) a sheet-like composite precursor, comprising a carrier layer (104), and

ii) a polymer composition P containing a polyester; and b) superimposing the carrier layer (104) with the polymer composition P to obtain a polymer layer P overlying the carrier layer (104);

the polymer layer P

a. extends in a layered plane,

c. in a further layer direction lying in the layer plane and perpendicular to the first layer direction has a further modulus of elasticity, a ratio of the first modulus of elasticity to the further modulus of elasticity being in a range from 0.81 to 1.19.

5. A method (300) including as method steps

a) Provide

i) a sheet-like composite precursor, comprising a carrier layer (104), and

ii) a polymer composition P containing a polyester; and

b) superimposing the carrier layer (104) with the polymer composition P to obtain a polymer layer P overlying the carrier layer (104);

wherein the polymer composition P is liquid when superimposed in process step b) (302).

6. A sheet-like composite (100) obtainable by the method (300) according to claim 4 or 5.

7. A container precursor (500), comprising at least one sheet-like area of the sheet-like composite (100) according to one of claims 1 to 3, or 6.

8. A container (700) containing at least one sheet-like area of the sheet-like composite (100) according to one of claims 1 to 3, or 6.

9. A method (400) including as method steps

a. Providing at least one sheet-like area of the sheet-like composite (100) according to one of claims 1 to 3, or 6, the at least one sheet-like area including a first longitudinal edge and a further longitudinal edge;

b. Folding the at least one sheet-like region; and

c. Contacting and connecting the first longitudinal edge to the further longitudinal edge to obtain a longitudinal seam (502).

10. A container precursor (500) obtainable by the method (400) of claim 9.

11. A method (600) including as method steps

A. providing the container precursor (500) according to claim 7 or 10;

B. forming a bottom portion (504) of the container precursor (500) by folding the sheet-like portion;

C. closing the bottom area (504);

D. filling the container precursor (500) with a food (701); and

E. Closing the container precursor (500) in a head area (503) to obtain a closed container (700).

12. A closed container (700), obtainable by the method (600) according to claim

11th

13. A use of the sheet-like composite (100) according to one of claims 1 to 3, or 6 for producing a food container.

14. Use of an extruder to react a base polymer with a chain modifier to obtain a polymer P and to form a sheet-like composite (100) for a food container by melt extrusion coating with the polymer P.

15. Use of a chain modifier to make a sheet (100) for a food container.

16. Use of a blend comprising a base polymer and a chain modifier for making a sheet-like composite (100) for a food container.

17. Use of a base polymer to form a sheet-like composite (100) for a food container by reacting the base polymer with a chain modifier.

18. Use of a polyester to form a sheet-like composite (100) for a food container by melt extrusion coating with the polyester.

19. Use of a polyester for producing a flat composite (100) for a food container,

wherein the sheet-like composite (100) contains a polymer layer P containing the polyester,

the polymer layer P

a. extends flat in a layer plane