DE102019114198A1 - Metallized barrier paper, related articles and uses, and processes for making same - Google Patents

Abstract

A metallized barrier paper (1) is described, at least comprising the components S1) arranged in layers, at least one carrier paper (10), S2) at least one barrier layer (20) arranged on the back of the carrier paper, comprising at least one barrier material, and S3) at least one, metal layer (30) preferably arranged on the or a barrier layer. Furthermore, an article is described comprising the metallized barrier paper and a method for its production. The use of a metal layer to improve certain properties of a barrier paper and the use of the metallized barrier paper for packaging a product are also described.

Description

The present invention relates to a metallized barrier paper, at least comprising the components S1) arranged in layers, at least one carrier paper, S2) at least one barrier layer arranged on the back of the carrier paper, comprising at least one barrier material, and S3) at least one, preferably on the or a barrier layer arranged, metal layer. The present invention further relates to an article comprising the metallized barrier paper and a method for its production. The present invention also relates to the use of a metal layer to improve certain properties of a barrier paper and the use of the metallized barrier paper for packaging a product.

High demands are placed on the barrier layer of a barrier paper for packaging a wide variety of products such as food in various stages of processing or preparation, pharmaceutical products or high-quality devices such as electrical appliances. The barrier function of such a barrier paper should above all have a high or defined resistance to penetration with or by water, steam, fats, oils and / or odors in order to effectively protect the products packaged therein against environmental influences. It should also be possible to dispose of the packaging material as easily as possible.

Conventional packaging papers for foodstuffs, such as in the document, are known, for example DE 10 2014 119 572 A1 described.

A film composite packaging material is already offered as a further packaging option. A film composite packaging material can consist, for example, of a film composite material formed from a paper and a plastic and / or aluminum film. For example, paper is coated on one side with polyethylene, often in an extrusion process, or with an aluminum foil

In the document EP 3 342 929 A1 describes a barrier paper for contact with food which has a high resistance to fats and / or oils and / or moisture and which is not a film composite packaging material.

However, there is still a great need in industry and trade for packaging materials, in particular packaging paper such as barrier paper, for packaging a wide range of products, the packaging materials being characterized by an even further improved barrier effect, the provision or increase of temperature-insulating properties and, if possible, heat-sealability .

It was therefore a primary object of the present invention to provide a barrier paper which, in addition to excellent barrier functionality, also has improved temperature-insulating properties and as good as possible a heat sealability or even better than the prior art.

Another, specific object of the present invention was to provide an article, for example in the form of a packaging paper, wrapping paper or wrapping paper, which comprises or consists of the improved barrier paper.

Further objects of the present invention consisted in specifying a production method for an above-specified, improved barrier paper and in expanding the field of application of metallizations or metal coatings known per se.

• S1) mindestens ein Trägerpapier, aufweisend eine Vorderseite und eine der Vorderseite gegenüberliegende Rückseite,
• S2) mindestens eine auf der Rückseite des mindestens einen Trägerpapieres angeordnete Barriereschicht, umfassend mindestens ein Barrierematerial, ausgewählt aus der Gruppe bestehend aus:
  • - vernetzte oder unvernetzte polymere Bindemittel,
  • - natürliche Wachse,
  • - synthetische Wachse,
  • - pflanzliche Öle,
  • - vorzugsweise organische Pigmente,
  • - anorganische Pigmente,
  • - vernetzte Polysaccharide, und
  • - deren Mischungen und
• S3) mindestens eine Metallschicht.

It has now surprisingly been found that the primary object and further objects and / or sub-objects of the present invention are achieved by a, preferably heat-sealable, metallized barrier paper, at least comprising the following components arranged in layers:

• S1) at least one carrier paper, having a front side and a rear side opposite the front side,
• S2) at least one barrier layer arranged on the back of the at least one carrier paper, comprising at least one barrier material selected from the group consisting of:
  • - crosslinked or uncrosslinked polymeric binders,
  • - natural waxes,
  • - synthetic waxes,
  • - vegetable oils,
  • - preferably organic pigments,
  • - inorganic pigments,
  • - crosslinked polysaccharides, and
  • - their mixtures and
• S3) at least one metal layer.

A metalized barrier paper according to the invention described above or below has, in addition to an excellent barrier functionality against the penetration of water, steam, fats, oils and / or odors, also excellent temperature-insulating properties and ideally also good or even improved compared to the prior art Heat sealability.

A particular advantage of the metallized barrier paper according to the invention is that in many cases the use of secondary packaging, for example in the form of a polyethylene inner bag in conventional paper packaging for e.g. Food - makes it superfluous and in this way contributes to saving costs and packaging material.

The invention and combinations of preferred parameters, properties and / or components of the present invention preferred according to the invention are defined in the appended claims. Preferred aspects of the present invention are also given or defined in the following description and in the examples.

The metallized barrier paper according to the invention can only have the aforementioned constituents (layers) arranged in layers, or it can also have further, additional layers. For example, the barrier paper according to the invention can have more than one barrier layer, in particular two, three or more barrier layers. In such cases, the two, three or more barrier layers are preferably arranged on top of one another and in contact with one another. If the barrier paper according to the invention comprises two or more barrier layers, these are preferably selected so that they mutually reinforce and / or complement one another in their barrier effect. In the present text, the side facing the carrier substrate is referred to as the front side of the or a barrier layer. The side of the or a barrier layer opposite this side is referred to in this text as its rear side.

The metallized barrier paper according to the invention can likewise have one or more intermediate layers, in particular two, three or more intermediate layers. Intermediate layers primarily have the purpose of smoothing the surface of a substrate such as, in particular, a carrier paper. However, such intermediate layers can also - e.g. due to the nature of the binders contained therein - each have certain barrier functions. An intermediate layer contained in a barrier paper according to the invention can, for example, also be a barrier primer. An intermediate layer specified here above preferably comprises at least one polymeric binder, preferably selected from the subgroups of crosslinked or uncrosslinked polymeric binders G1) and / or G2) indicated below.

A metallized barrier paper according to the invention is preferred in which the at least one carrier paper S1) provided as the substrate comprises a paper selected from the group consisting of a coated paper (or paper substrate), an uncoated paper (or paper substrate), and a non-surface-treated one Coating base paper (or coating base paper substrate) and combinations of the aforementioned papers (or paper substrates). In a variant of the present invention, a barrier paper according to the invention is preferred, the carrier paper S1) comprising or being a non-surface-treated base paper.

In general, in the field of special papers, those skilled in the art basically subdivide or differentiate between “uncoated” papers and “coated” papers.

A coated paper (or paper substrate) is understood in the context of the present invention and as is customary in the technical field, a paper which comprises one or more layers applied by painting, in particular a paper which has two, three, four or more layers. Functional layers (but preferably no barrier layers as defined in the present text) and structure-forming layers (such as leveling layers for smoothing the surface) are suitable as layers of such a coated paper. A coated paper (or paper substrate) to be used as carrier paper according to the invention can be coated on one side or on both sides.

Under an uncoated paper (or paper substrate) is understood in the context of the present invention (and as usual in the technical field) a paper which is not coated (i.e. does not include layers applied by coating), but which can include layers that are not coated Are or have been applied by brushing. An uncoated paper can thus be prepared and comprise, for example, a surface or a starch layer impregnated with starch.

A non-surface-treated base paper (or base paper substrate) is understood within the scope of the present invention and as is customary in the technical field to be a paper substrate which is uncoated and unprepared.

In the context of the present invention, “paper” is understood to mean paper, cardboard and cardboard. In the context of this invention, paper, cardboard and paperboard are flat materials that can be produced from the same basic materials and according to basically the same manufacturing methods. In the context of this invention, a distinction is made between paper, cardboard and cardboard only on the basis of the weight per unit area, cardboard having a weight per square meter of greater than 600 g / m ² , cardboard having a weight per square meter of greater than 150 and less than or equal to 600 g / m ² and paper having a weight per square meter of has less than or equal to 150 g / m ² . All commercially available printing papers, base papers, packaging papers, label papers, kraft papers or special papers can be used as paper.

According to the invention, a metallized barrier paper is preferred, the carrier paper having a mass per unit area in the range from 40 to 250 g / m ² , preferably in the range from 50 to 150 g / m ² , particularly preferably in the range from 60 to 100 g / m ² .

In preferred embodiments of the present invention, the carrier paper comprises or consists of a paper (or a paper substrate) which itself already has certain barrier properties due to a suitable choice of material and / or a suitable manufacturing process (as indicated below).

• - einem Papier bzw. Papiersubstrat, welches bei einem Druck (angegeben als sog. Linienlast in kN/m) von mindestens 40 kN/m und einer Temperatur von mindestens 25 °C kalandriert wurde und/oder welches auf einer oder auf beiden Seiten vollflächig mit Stärke imprägniert ist und/oder einen Kurzfaser-Zellstoff mit einem Schopper-Riegler-Grad von mindestens 30°SR und einen Langfaser-Zellstoff mit einem Schopper-Riegler-Grad von mindestens 25°SR aufweist, (hier und für alle entsprechenden Angaben in diesem Text:) bestimmt nach DIN EN ISO 5267-1 : 2000-10 , und wobei das Papiersubstrat mindestens einen Massenanteil von 50 % Kurzfaser-Zellstoff umfasst, bezogen auf die Gesamtmasse aus im Papiersubstrat vorliegenden Kurzfaser-Zellstoff und Langfaser- Zellstoff;
• - einem Papier bzw. Papiersubstrat, welches Zellstofffasern umfasst, wobei der Massenanteil der Zellstofffasern ≥ 90 % beträgt, bezogen auf die Gesamtmasse des Papiersubstrates und bestimmt als ofentrockener Massenanteil;
• - einem Papier bzw. Papiersubstrat, welches Zellstofffasern umfasst, wobei zumindest ein Teil der Zellstofffasern aus Grasfasern besteht;
• - einem Papier bzw. Papiersubstrat, welches einen Zellstoff umfasst, welcher
• - einen Schopper-Riegler-Grad im Bereich von 24 bis 54°SR, vorzugsweise im Bereich von 29 bis 49°SR, besonders bevorzugt im Bereich von 34 bis 44°SR, aufweist, bestimmt nach DIN EN ISO 5267-1 : 2000-10 , und/oder
• - einen KIT-Wert von mindestens 7, vorzugsweise von mindestens 11, besonders bevorzugt von mindesten 12, aufweist, gemessen nach Methode Tappi T 559; und
• - deren Mischungen bzw. Kombinationen.

It is therefore also preferred an above-mentioned metallized barrier paper according to the invention (or a preferred metallized barrier paper according to the invention described in this text), wherein the carrier paper S1 provided as the substrate comprises or is a paper which is selected from the group (the group of Paper substrates indicate those which already have certain barrier properties due to a suitable material selection and / or a suitable manufacturing process) consisting of:

• - a paper or paper substrate which was calendered at a pressure (specified as so-called line load in kN / m) of at least 40 kN / m and a temperature of at least 25 ° C and / or which was completely covered on one or both sides with Starch is impregnated and / or has a short fiber pulp with a Schopper-Riegler degree of at least 30 ° SR and a long fiber pulp with a Schopper-Riegler degree of at least 25 ° SR, (here and for all relevant information in this Text :) determined after DIN EN ISO 5267-1: 2000-10 , and wherein the paper substrate comprises at least a mass fraction of 50% short fiber pulp, based on the total mass of short fiber pulp and long fiber pulp present in the paper substrate;
• a paper or paper substrate which comprises cellulose fibers, the mass fraction of the cellulose fibers being ≥ 90%, based on the total mass of the paper substrate and determined as the oven-dry mass fraction;
• - A paper or paper substrate which comprises cellulose fibers, at least some of the cellulose fibers consisting of grass fibers;
• - A paper or paper substrate, which comprises a pulp, which
• - has a Schopper-Riegler degree in the range from 24 to 54 ° SR, preferably in the range from 29 to 49 ° SR, particularly preferably in the range from 34 to 44 ° SR, determined according to DIN EN ISO 5267-1: 2000-10 , and or
• - has a KIT value of at least 7, preferably of at least 11, particularly preferably of at least 12, measured by the Tappi T 559 method; and
• - their mixtures or combinations.

It has been shown that a paper or paper substrate specified above which has been calendered at a pressure of at least 40 kN / m and a temperature of at least 25 ° C and / or which is completely impregnated with starch on one or both sides and / or which has a short fiber pulp with a Schopper-Riegler degree of at least 30 ° SR and a long fiber pulp with a Schopper-Riegler degree of at least 25 ° SR, is particularly suitable for producing a barrier paper that has a very high has a high barrier effect against fat and / or oil and / or moisture. Paper substrates suitable for the purposes of the variant of the present invention described in this paragraph, their properties and preferred combinations are described in particular in the document EP 3 342 929 A1 .

It has also been shown that a paper or paper substrate specified above, which comprises cellulose fibers, preferably sulfate cellulose fibers, where the mass fraction of the cellulose fibers is ≥ 90%, based on the total mass of the paper substrate and determined as the oven-dry mass fraction, are excellently suitable to produce a barrier paper that has a low water and water vapor permeability as well as a high fat and water resistance. In addition, it has been shown that such a paper substrate is outstandingly suitable for paper recycling due to its composition.

It has also been shown that a paper or paper substrate specified above which comprises cellulose fibers, at least some of the cellulose fibers consisting of grass fibers, is particularly suitable for the purposes of the present invention, the mass fraction of cellulose fibers in the paper substrate in the range of 1 up to 100% (or 99%) consists of grass fibers, preferably in the range from 5 to 70%, particularly preferably in the range from 40 to 60, based on the total mass of the cellulose fibers and determined as the oven-dry mass fraction. Such a paper substrate is also outstandingly suitable for paper recycling because of its composition.

It has then been shown that a paper or paper substrate specified above which comprises a pulp which has a Schopper-Riegler degree in the range from 24 to 54 ° SR and / or a KIT value of at least 7, preferably if that Paper substrate comprises or consists of a pulp, which is a short fiber pulp and a long fiber pulp in a ratio between short fiber pulp and long fiber pulp in the range from 2: 1 to 1: 2, preferably in the range from 1.5: 1 to 1: 1.5, leads to a particularly dense paper that already has a very high barrier effect against fat.

The metallized barrier paper according to the invention comprises at least one barrier layer S2) arranged on the rear side of the carrier paper. In the context of the present invention, the expression “arranged on the back of the backing paper” in the case of several barrier layers present in the barrier paper also includes the configurations that one or more, in particular one, two or more, in particular one, two or more barrier layers (arranged on the back of the backing paper) several further barrier layers are arranged. A metal layer S3) optionally arranged on the (or a) barrier layer is in these cases preferably arranged on the outermost barrier layer, preferably on the outside thereof (which is not in contact with another layer of the barrier paper according to the invention).

• G1) einer ersten Untergruppe, bestehend aus Stärke, Polyvinylalkohol, Carboxylgruppen-modifiziertem Polyvinylalkohol, Silanolgruppen-modifiziertem Polyvinylalkohol, Diaceton-modifiziertem Polyvinylalkohol, Ethylen-Vinylalkohol-Copolymer, einer Kombination aus Polyvinylalkohol und Ethylen-Vinylalkohol-Copolymer, Ethylen-Vinylacetat-Copolymer, modifiziertem Polyethylenglycol, unmodifiziertem Polyethylenglycol, α-isodecyl-ω-hydroxy-Poly(oxy-1,2-ethanediyl), Styrol-Butadien-Latex, und deren Mischungen,
• G2) einer zweiten Untergruppe, bestehend aus
  • - Polyacrylate,
  • - Polymethacrylate,
  • - Acrylat-Copolymere, wobei vorzugsweise deren Monomere jeweils unabhängig voneinander ausgewählt sind aus der Gruppe bestehend aus Acrylsäurealkylester (vorzugsweise Acrylsäuremethylester, Acrylsäurebutylester und Acrylsäure-2-ethylhexylester), Methacrylsäurealkylester (vorzugsweise, Methacrylsäuremethylester, Methacrylsäurebutylester und Methacrylsäure-2-ethylhexylester), Acrylnitril, Methacrylnitril, Styrol, α-Methylstyrol und deren Gemische,
  • - Polystyrole,
  • - Polybutadiene, und
  • - deren Gemische und
• G3) einer dritten Untergruppe, bestehend aus Polyethylene, Polyvinylacetate und Polyacrylnitrile und deren Gemische.

A metallized barrier paper according to the invention specified above (or a preferred metallized barrier paper according to the invention described in this text) is preferred, the barrier layer S2) (or if two or more barrier layers are present in the metallized barrier paper according to the invention, at least one of these two or more barrier layers, Preferably, each barrier layer present in the metallized barrier paper according to the invention comprises one or more crosslinked or uncrosslinked polymeric binders, preferably selected from the group consisting of (ie from one, two or all three of the subgroups mentioned below):

• G1) a first sub-group consisting of starch, polyvinyl alcohol, carboxyl group-modified polyvinyl alcohol, silanol group-modified polyvinyl alcohol, diacetone-modified polyvinyl alcohol, ethylene-vinyl alcohol copolymer, a combination of polyvinyl alcohol and ethylene-vinyl alcohol copolymer, ethylene-vinyl acetate copolymer, modified polyethylene glycol, unmodified polyethylene glycol, α-isodecyl-ω-hydroxy-poly (oxy-1,2-ethanediyl), styrene-butadiene latex, and mixtures thereof,
• G2) a second subgroup consisting of
  • - polyacrylates,
  • - polymethacrylates,
  • - Acrylate copolymers, whereby their monomers are preferably each independently selected from the group consisting of acrylic acid alkyl ester (preferably acrylic acid methyl ester, acrylic acid butyl ester and acrylic acid 2-ethylhexyl ester), methacrylic acid alkyl ester (preferably methacrylic acid methyl ester, methacrylic acid butyl ester, methacrylic acid 2-ethylhexyl ester), Methacrylonitrile, styrene, α-methylstyrene and their mixtures,
  • - polystyrene,
  • - Polybutadiene, and
  • - their mixtures and
• G3) a third subgroup, consisting of polyethylenes, polyvinyl acetates and polyacrylonitriles and their mixtures.

The polymeric binders according to the subgroup G2) indicated above and / or according to the subgroup G3) indicated above, preferably polyethylenes and / or polyacrylonitriles, and / or mixtures of the polymeric binders of the subgroup G2) with polymeric binders of the subgroup G3) as Barrier material S2) polymeric binders to be used in the metallized barrier paper according to the invention.

In the context of the present invention, a polymeric binder is preferably understood to mean a binder which has been built up from a large number of molecules by polycondensation and in which one or more types of atoms or atom groups (so-called repeat units) are repeatedly strung together and which Number of repeating units per molecule is more than 25. Unless expressly stated otherwise in this text, the polymeric binders to be used according to the invention can each be crosslinked or uncrosslinked.

• - Polyacrylate,
• - Polymethacrylate,
• - Acrylat-Copolymere, wobei vorzugsweise deren Monomere jeweils unabhängig voneinander ausgewählt sind aus der Gruppe bestehend aus Acrylsäurealkylester (vorzugsweise Acrylsäuremethylester, Acrylsäurebutylester und Acrylsäure-2-ethylhexylester), Methacrylsäurealkylester (vorzugsweise, Methacrylsäuremethylester, Methacrylsäurebutylester und Methacrylsäure-2-ethylhexylester), Acrylnitril, Methacrylnitril, Styrol, α-Methylstyrol und deren Gemische,
• - Polystyrole,
• - Polybutadiene, und - deren Gemische.

Accordingly, a metallized barrier paper according to the invention specified above is also preferred (or a preferred metallized barrier paper according to the invention described in this text), the or at least one of several polymeric binder to be used as the barrier material of the barrier layer (component S2)) being a crosslinked or uncrosslinked polymeric binder and is selected from the group (preferably from the aforementioned subgroup G2)) consisting of:

• - polyacrylates,
• - polymethacrylates,
• - Acrylate copolymers, whereby their monomers are preferably each independently selected from the group consisting of acrylic acid alkyl ester (preferably acrylic acid methyl ester, acrylic acid butyl ester and acrylic acid 2-ethylhexyl ester), methacrylic acid alkyl ester (preferably methacrylic acid methyl ester, methacrylic acid butyl ester, methacrylic acid 2-ethylhexyl ester), Methacrylonitrile, styrene, α-methylstyrene and their mixtures,
• - polystyrene,
• - Polybutadienes, and - their mixtures.

A group of (crosslinked or uncrosslinked) polymeric binders suitable as a barrier material and / or as a component of a barrier layer are in many cases acrylate copolymers. Under an acrylate copolymer, preferably under an as Barrier material to be used acrylate copolymer is understood in the context of the present invention (and unless expressly stated otherwise in this text) preferably a copolymer derived from acrylic acid, which has an average molar mass in the range of 50,000 to 150,000 g / mol, particularly preferably of 80,000 to 130,000 g / mol and very particularly preferably from 90,000 to 100,000 g / mol. For the purposes of the present invention, the mean molar mass is preferably determined with the aid of gel permeation chromatography (GPC) with tetrahydrofuran (THF) as solvent, polystyrene as standard and refractive index detection (RI detector, refractive index detector).

In the context of the present invention, an acrylate copolymer is particularly preferably a copolymer produced using two, three, four, five, six or all of the monomers selected from the group consisting of acrylic acid alkyl esters (preferably acrylic acid methyl ester, acrylic acid butyl ester and / or 2-ethylhexyl acrylate), alkyl methacrylate (preferably methyl methacrylate, butyl methacrylate, and / or 2-ethylhexyl methacrylate) and styrene.

The properties of the resulting acrylate copolymers can be controlled in the desired manner through a selection of the monomers used in each case for the production of an acrylate copolymer. Our own studies have shown that an acrylate copolymer made from methyl acrylate, methyl methacrylate, butyl acrylate, butyl methacrylate, ethyl-2-acrylate, ethyl-2-methacrylate and / or styrene has particularly good barrier properties.

In addition to methyl acrylate, methyl methacrylate, butyl acrylate, butyl methacrylate, 2-ethylhexyl acrylate, 2-ethylhexyl methacrylate and styrene, other monomers may have been used to produce the acrylate copolymer or the copolymer was produced from two, three, four, five, six or all monomers selected from the group consisting of methyl acrylate, methyl methacrylate, butyl acrylate, butyl methacrylate, 2-ethylhexyl acrylate, 2-ethylhexyl methacrylate and styrene. According to the invention, the acrylate copolymer is particularly preferably a random copolymer.

In the context of the present invention, a wax suitable as a barrier material and / or as a component of a barrier layer of the metallized barrier paper according to the invention is a natural wax (as described in more detail below), a mixture of several natural waxes, a synthetic wax (as below described in more detail), a mixture of several synthetic waxes, or a mixture of one or more natural waxes with one or more synthetic waxes.

In the context of the present invention, a natural wax suitable as a barrier material and / or as a component of a barrier layer of the metallized barrier paper according to the invention is preferably a wax based on a vegetable oil. In the context of the present invention, a wax based on a vegetable oil is preferably understood to mean a wax that is or has been obtained by chemical modification of a vegetable oil. The chemical modification is preferably a partial or complete hydrogenation with a metallic catalyst, for example nickel, and hydrogen, all or only some of the double bonds present in the oil before the chemical modification being hydrogenated to single bonds. Unlike vegetable oils, waxes based on vegetable oils are not liquid but solid at 20 ° C. The chemical modification of the vegetable oil thus causes an increase in the melting point.

In the context of the present invention, a vegetable oil is understood to mean a fatty acid triglyceride (comprising naturally occurring fatty acids esterified with glycerol) which is obtained from plants or parts of plants. The oil is usually obtained by pressing, extraction or refining (of the oil or oils) from the plants or parts of plants. The extraction of the oils is known to the person skilled in the art. If plant seeds are used to produce oil, these are called oil seeds. In the seeds, the oil occurs in the form of lipids, which represent its cell membrane and energy reserves. Depending on the proportion of unsaturated fatty acids in the oil, a distinction is made between non-drying (e.g. olive oil), semi-drying (e.g. soy or rapeseed oil) and drying oils (e.g. linseed or poppy seed oil). The term "drying" does not mean evaporation, but the solidification or solidification of the oil caused by the oxidation and polymerization of the unsaturated fatty acids. The use of semi-drying and drying oils as starting materials for producing the waxes used according to the invention is preferred. A natural wax, for example in the form of a wax emulsion, for example in the form of a commercially available wax emulsion, can be contained in a barrier layer coating composition or in a barrier screed.

Possible sources for vegetable oils that can be used in the context of the present invention (or for waxes based on vegetable oils which can be used in the context of the present invention) are agai oil, algae oil, argan oil (from the fruits of the argan tree), avocado oil (from the pulp of the avocado of the avocado tree ), Babaçu oil, cottonseed oil (from the seeds of the cotton plant), borage oil or borage seed oil (from the seeds of the borage plant), cupuagu butter, cashew peel oil, safflower oil (also called "safflower oil", from the seeds of safflower or carthamus), peanut oil (from the fruit of the peanut plant), hazelnut oil (from the hazelnuts of the hazelnut bush), hemp oil (from the seeds of the edible hemp), jatropha oil (from the seeds of Jatropha curcas), jojoba oil (actually a liquid wax; from the seeds of the jojoba bush), Camellia oil (from the seeds of Camellia oleifera, Camellia sinensis or Camellia japonica, cocoa butter, coconut oil (from the seed flesh of the coconut, the tree fruit of the coconut spalme), pumpkin seed oil (also known as seed oil; from the seeds of the Styrian oil pumpkin), linseed oil (from the ripe flax seeds of the flax), camelina oil (from the seeds of the camelina, cruciferous family), macadamia oil (from the nuts of the macadamia tree), corn oil (from the germs of corn), almond oil (from the almonds of the almond tree), mango butter (from Mangifera indica), apricot kernel oil or apricot kernel oil (from the apricot kernel - i.e. the almond of the apricot stone - the apricot or apricot), poppy seed oil (from the seeds of the poppy seeds), evening primrose oil, olive oil ( from the pulp and core of the olive, the fruit of the olive tree, palm oil (from the pulp of the palm fruit, the fruit of the oil palm), palm kernel oil (from the kernels of the palm fruit, the fruit of the oil palm), papaya oil, pistachio oil, pecan oil, perilla oil the seeds of the perilla plant (shiso, sesame leaf), rapeseed oil (from the seeds of rapeseed, cruciferous family), rice oil, castor oil (from the seeds of the miracle tree), sea buckthorn oil (from the pulp of the family) he sea buckthorn berry, the fruit of the sea buckthorn bush), sea buckthorn kernel oil (from the kernels of the sea buckthorn berry, the fruit of the sea buckthorn bush), mustard oil (from the seeds of the black mustard), black cumin oil (from the seeds of the fruit capsule of the black cumin plant), sesame oil (from the seeds of the Sesame plant), shea butter (from the seeds of the shea nut tree), soybean oil (from the beans of the soybean), sunflower oil (from the kernels of the sunflower), tung oil, walnut oil (from the kernels of the walnut tree), watermelon seed oil, grapeseed oil (from the kernels of the fruit (grape) of the vine or grapevine), wheat germ oil (from the germs of wheat) and / or cedar oil (from the wood of the Lebanon cedar). This list is not to be regarded as closed; it shows possibilities for obtaining vegetable oils to be used according to the invention, which can be converted into a wax to be used according to the invention.

In the context of the present invention, waxes based on vegetable oil that are preferably to be used are selected from the list consisting of palm oil, coconut oil, poppy seed oil, olive oil, linseed oil, soybean oil, sunflower oil, safflower oil, rapeseed oil and mixtures thereof. The wax based on a vegetable oil for use in the context of the present invention is preferably a wax based on a soybean oil, i. H. around soybean oil wax or soy wax.

It has been shown that waxes made from the oils mentioned above as being preferred are characterized by high resistance and that they can be produced with high melting points. The waxes to be used preferably according to the invention (palm oil wax, coconut oil wax, poppy seed oil wax, olive oil wax, linseed oil wax, soybean oil wax, sunflower oil wax, safflower oil wax and rapeseed oil wax and mixtures thereof) show a significant increase in the resistance to fats and / or oils and / or when used in barrier layers of metallized barrier papers according to the invention Humidity. Our own studies have shown that when using soybean oil wax, in addition to being resistant to fat, oil and moisture, very low water vapor permeability can also be obtained. The soybean oil wax also has the advantage that it can be produced in a tasteless and odorless quality.

A wax based on a vegetable oil, which has a melting point above 40 ° C., preferably above 50 ° C., particularly preferably above 60 ° C., is preferred as a barrier material and / or as a component of a barrier layer in a metallized barrier paper according to the invention. It has been shown that when using waxes with a melting point of over 20 ° C, very good results can be obtained. However, it was also possible to show that when using waxes with a melting point of over 40 ° C., the resistance of a barrier layer or of a barrier paper according to the invention containing it to mechanical stress can be increased. This resistance is increased even further at even higher melting points of the waxes. If a barrier paper according to the invention is also to be used at higher temperatures, it can be useful to use a wax based on a vegetable oil with a correspondingly higher melting point.

According to the invention, a metallized barrier paper is preferred, the mass fraction of wax based on a vegetable oil in the barrier layer being 6 to 98%, preferably 20 to 90%, is particularly preferably 50 to 89%, based on the total mass of the barrier layer. Our own studies have surprisingly shown that with a corresponding wax mass fraction of less than 6%, the barrier properties against fat, oil and moisture decrease disproportionately, while with a corresponding wax mass fraction of over 98%, excellent barrier properties can be obtained, but the mechanical resistance of the or a barrier layer decreases disproportionately. A particularly good compromise between barrier and mechanical properties can be obtained in many cases if the corresponding wax mass fraction of the barrier layer is in the range from 50 to 89%.

In the context of the present invention, a synthetic wax suitable as a barrier material and / or as a component of a barrier layer is preferably a wax based on saturated hydrocarbons. A synthetic wax particularly preferably comprises or consists in the context of the present invention of one, two, three or more than three alkanes, preferably selected from the group consisting of heneicosane, docosane, tricosane, tetracosane, pentacosane, hexacosane, heptacosane, octacosane, nonacosane, Triacontane, hentriacontane, dotriacontane, tritriacontane, tetratriacontane, pentatriacontane, hexatriacontane, heptatriacontane, octatriacontane and nonatriacontane, particularly preferably selected from the group consisting of hexacosane, heptacosane, octacosane, nonacosane and triacontane. According to the invention, a wax comprising or consisting of octacosane is particularly preferably used as the synthetic wax. A synthetic wax, for example in the form of a wax emulsion, for example in the form of a commercially available wax emulsion, can be contained in a barrier layer coating composition or in a barrier screed.

A synthetic wax which has a melting point above 40.degree. C., preferably above 50.degree. C., particularly preferably above 60.degree. C., is preferred as the barrier material and / or as a component of a barrier layer in a metallized barrier paper according to the invention. It has been shown that when using synthetic waxes with a melting point of over 30 ° C, very good results can be obtained. However, it has also been shown that the use of synthetic waxes with a melting point of over 40 ° C can increase the resistance to mechanical stress. This resistance is increased even further at even higher melting points of the waxes. If a metallized barrier paper according to the invention is also to be used at higher temperatures, it can be useful to use a synthetic wax with a correspondingly higher melting point.

According to the invention, a metallized barrier paper is preferred, the mass fraction of a synthetic wax in the or a barrier layer in the range from 5 to 60%, preferably from 15 to 50%, particularly preferably from 20 to 40%, based on the total mass the or a barrier layer.

It has been shown that with a corresponding wax mass fraction of less than 5%, the barrier properties against fat, oil and moisture decrease disproportionately, while with a corresponding wax mass fraction of over 60%, excellent barrier properties can be obtained, but the mechanical resistance of the one Barrier layer decreases disproportionately. It has also been shown that particularly good metallized barrier papers with excellent barrier and mechanical properties can be obtained if the wax mass fraction of the or a barrier layer is in the range from 20 to 40%.

In the context of the present invention, a vegetable oil suitable as a barrier material and / or as a component of a barrier layer is preferably understood to mean a vegetable oil (as defined above) which is selected from the list consisting of palm oil, coconut oil, poppy seed oil, olive oil, linseed oil, soybean oil , Sunflower oil, safflower oil, rapeseed oil and their mixtures. The vegetable oil suitable as a barrier material and / or as a component of a barrier layer is particularly preferably sunflower oil, soybean oil, palm oil and / or rapeseed oil.

In a preferred variant of the present invention, the or a vegetable oil can be at least partially covered with a polymer or used encased in a polymer. Such a partial covering and / or wrapping (which is also referred to as core-shell particles) can for example be described in the document WO 2008/014903 A1 described method are generated. For example, the corresponding polymer is a copolymer of styrene and maleic anhydride derivatives. The polymer preferably contains a maleimide group and is preferably formed by a copolymer with maleimide groups, in particular a copolymer of styrene and maleic anhydride derivatives. This aforementioned partial covering and / or wrapping can alternatively also according to that in the document WO 2011/110498 A1 described method are generated.

In the context of the present invention, an inorganic pigment suitable as a barrier material and / or as a component of a barrier layer is preferably selected from the group consisting of calcined kaolin, kaolin, kaolinite, magnesium silicate hydrate, silicon oxide, bentonite, calcium carbonate, calcium silicate hydrates (preferably made from the minerals tobermorite and / or xonotlite), calcium aluminate sulphate (preferably according to CAS No. 12004-14-7), aluminum hydroxide, aluminum oxide and boehmite.

An abovementioned inorganic pigment is particularly preferred as a barrier material and / or as a component of a barrier layer, which is shaped like a plate. It has been shown that the use of flake-form pigments leads to particularly good barrier properties. When using platelet-shaped pigments in a barrier layer, the individual platelets of the pigment are apparently offset one on top of the other, so that a dense layer structure with a high barrier effect arises. Pigments that are not in the form of platelets do not form these layer structures. Platelet-shaped (also referred to as “flake-shaped” or “flake-like”) are understood to mean particles which have a significantly larger diameter than thickness. It is particularly preferred according to the invention if the flake-form pigment has a (preferably average) aspect ratio of 5 to 100, preferably from 15 to 100, more preferably from 20th to 80. The aspect ratio (also called “aspect ratio” or “shape factor”) is the quotient between the diameter and the thickness of the platelet of the inorganic pigment before it is mixed with the other components. An aspect ratio of 15 means that the diameter of the plate is 15 times larger than the thickness of the plate.

In the context of the present invention, a pigment suitable as a barrier material and / or as a component of a barrier layer is preferably an organic pigment, an inorganic pigment (as defined above) or a mixture of an organic pigment and an inorganic pigment. Particularly preferred in the context of the present invention is a metallized barrier paper, the pigment to be used in a barrier layer or the pigment contained in a barrier layer comprising an inorganic pigment (preferably a platelet-shaped inorganic pigment) or a mixture of such inorganic pigments.

In the context of the present invention, a crosslinked polysaccharide suitable as a barrier material and / or as a component of a barrier layer is preferably understood to mean a crosslinked xylan, particularly preferably a crosslinked arabinoxylan.

According to the invention, a metallized barrier paper is particularly preferred, the xylan being a xylan made from wheat and / or barley husks. Even if xylans from other vegetable sources are also very suitable, it has been shown that xylans from wheat and / or barley husks when used in the or a barrier layer have a particularly good barrier effect against oxygen.

A metallized barrier paper according to the invention is preferred in which the crosslinked polysaccharide is a mixture of crosslinked starch and crosslinked xylan. It is particularly preferred if a mixture of starch and xylan (preferably arabinoxylan) is crosslinked, so that crosslinking also takes place between starch and xylan molecules. It is particularly preferred here if more starch than xylan is used, i. E. the starch content in the or a barrier layer is higher than the xylan content. When considering the proportion of starch and the proportion of xylan, reference is made to the respective mass proportions before crosslinking. If necessary - if the proportions already have to be determined for a crosslinked product - a corresponding calculation of the proportions originally present is carried out based on the certain proportion of D-glucose and D-xylose, which can be determined, for example, with the aid of nuclear magnetic resonance spectroscopy (NMR).

It has also been shown that a metallized barrier paper according to the invention which comprises a first and a second barrier layer, one of these barrier layers comprising a polysaccharide, has particularly good properties when the polysaccharide is present in its barrier layer in crosslinked fashion. If polysaccharides that are not crosslinked are used in a first barrier layer, the first barrier layer (comprising the non-crosslinked polysaccharide) may dissolve or dissolve when the second barrier layer is applied. After the first barrier layer or the polysaccharides in the first barrier layer have dissolved or partially dissolved, undesired mixing of the polysaccharides would then also occur the components of the second barrier layer take place. As a result, barrier papers would be obtained which had no distinct first and second barrier layers and had impaired barrier properties (in particular with regard to the barrier effect against gases (in particular oxygen).

According to the invention, crosslinked polysaccharides are preferably used in which the crosslinking of the polysaccharide took place with a crosslinking agent selected from the group consisting of zirconium carbonate, polyamidaminepichlorohydrin resins, boric acid, ammonium zirconium carbonate, methacrylate polymer, diacarboxylic acid, adipic acid, glutaric acid glyoxal, dihydroxy to titanium (IV ) (CAS No. 65104-06-5; Tyzor LA) and glyoxal derivatives, preferably the crosslinking agent is a glyoxal or a glyoxal derivative. It is preferred according to the invention if the crosslinking was carried out by adding the crosslinking agent in a mass fraction of 0.05 to 1%, preferably 0.1 to 0.45%, more preferably 0.35 to 0.425%, based on the total mass of all polysaccharides in the corresponding barrier layer.

• S21) eine auf der Rückseite des mindestens einen Trägerpapieres angeordnete erste Barriereschicht (21), vorzugsweise entsprechend der vorstehend angegebenen bzw. definierten Barriereschicht (20), und
• S22) eine auf der ersten Barriereschicht, vorzugsweise vollflächig, angeordnete zweite Barriereschicht (22), vorzugsweise umfassend mindestens ein Barrierematerial ausgewählt aus der Gruppe bestehend aus:
  • - vernetzte oder unvernetzte polymere Bindemittel, ausgewählt aus der Gruppe bestehend aus Polyacrylate; Polymethacrylate; Acrylat-Copolymere [wobei vorzugsweise deren Monomere jeweils unabhängig voneinander ausgewählt sind aus der Gruppe bestehend aus Acrylsäurealkylester (vorzugsweise Acrylsäuremethylester, Acrylsäurebutylester und Acrylsäure-2-ethylhexylester), Methacrylsäurealkylester (vorzugsweise, Methacrylsäuremethylester, Methacrylsäurebutylester und Methacrylsäure-2-ethylhexylester)], Acrylnitril, Methacrylnitril, Styrol, α-Methylstyrol und deren Gemische; Polystyrole; Polybutadiene, und deren Gemische;
  • - natürliche Wachse, vorzugsweise Wachse auf der Basis pflanzlicher Öle, besonders bevorzugt Wachse gewonnen durch chemische Modifikation pflanzlicher Öle,
  • - synthetische Wachse, vorzugsweise Wachse umfassend ein oder mehrere gesättigte Kohlenwasserstoffe,
  • - pflanzliche Öle,
  • - vorzugsweise organische Pigmente,
  • - anorganische Pigmente,
  • - vernetzte Polysaccharide, vorzugsweise umfassend mindestens ein vernetztes Xylan und
  • - deren Mischungen,

wobei vorzugsweise das mindestens eine Barrierematerial der zweiten Barriereschicht verschieden ist von dem mindestens einen Barrierematerial der ersten Barriereschicht.Furthermore, a metallized barrier paper according to the invention specified above (or a preferred metallized barrier paper according to the invention described in this text) is preferred, comprising, preferably as component S2) or as a variant of component S2):

• S21) a first barrier layer arranged on the back of the at least one carrier paper ( 21st ), preferably in accordance with the barrier layer specified or defined above ( 20th ), and
• S22) a second barrier layer arranged on the first barrier layer, preferably over the entire surface ( 22nd ), preferably comprising at least one barrier material selected from the group consisting of:
  • - crosslinked or uncrosslinked polymeric binders selected from the group consisting of polyacrylates; Polymethacrylates; Acrylate copolymers [where their monomers are preferably each independently selected from the group consisting of alkyl acrylate (preferably methyl acrylate, butyl acrylate, and 2-ethylhexyl acrylate), alkyl methacrylate (preferably methyl methacrylate, butyl methacrylate, 2-ethylhexyl methacrylate), Methacrylonitrile, styrene, α-methylstyrene and mixtures thereof; Polystyrenes; Polybutadienes, and their mixtures;
  • - natural waxes, preferably waxes based on vegetable oils, particularly preferably waxes obtained by chemical modification of vegetable oils,
  • - synthetic waxes, preferably waxes comprising one or more saturated hydrocarbons,
  • - vegetable oils,
  • - preferably organic pigments,
  • - inorganic pigments,
  • - Crosslinked polysaccharides, preferably comprising at least one crosslinked xylan and
  • - their mixtures,

wherein the at least one barrier material of the second barrier layer is preferably different from the at least one barrier material of the first barrier layer.

In the aforementioned case, the person skilled in the art selects a combination of the first and second barrier layers in such a way that there is no mutual impairment (e.g. loosening of the first barrier layer when the second barrier layer is applied), but in such a way that an improved or combined barrier effect (opposite can or forms only a first barrier layer).

• - einer Barriereschicht oder einem Barrierestrich, der auf der ersten Trägerschicht, oder, sofern eine zweite Trägerschicht vorhanden ist, auf der zweiten Trägerschicht, vollflächig aufgebracht ist, wobei das Auftragsgewicht des Barrierestrichs einen Masseanteil von weniger als oder gleich 5 % aufweist, bezogen auf die Gesamtmasse der ersten bzw. der zweiten Trägerschicht,

wobei vorzugsweise die erste bzw. die zweite Trägerschicht ein Papiersubstrat ist und das Auftragsgewicht des Barrierestrichs einen Masseanteil von weniger als oder gleich 5 % aufweist, bezogen auf die Gesamtmasse des Papiersubstrats (lutro);

• - einer Barriereschicht oder einem Barrierestrich umfassend oder bestehend aus einem polymeren Bindemittel und einem Wachs, vorzugsweise einem Wachs auf Basis eines pflanzlichen Öls,
• - einer Barriereschicht oder einem Barrierestrich umfassend oder bestehend aus einem polymeren Bindemittel und mindestens einem Wachs und/oder mindestens einem, vorzugsweise verkapselten, pflanzlichen Öl,
• - einer Barriereschicht oder einem Barrierestrich umfassend oder bestehend aus
  • - einem Acrylat-Copolymer und/oder
  • - einem Wachs, vorzugsweise einem Wachs auf Basis eines pflanzlichen Öls (besonders bevorzugt einem Wachs gewonnen durch chemische Modifikation eines pflanzlichen Öls) und/oder einem synthetischen Wachs; besonders bevorzugt umfassend oder bestehend aus einer, zwei, oder sämtlichen Komponenten a) bis c):
    1. a) einem Acrylat-Copolymer mit einer mittleren molaren Masse im Bereich von 50.000 bis 150.000 g/mol, wobei das Acrylat-Copolymer aus zwei, drei, vier, fünf, sechs oder sieben Monomeren hergestellt wurde ausgewählt aus der Gruppe bestehend aus Acrylsäuremethylester, Methacrylsäuremethylester, Acrylsäurebutylester, Methacrylsäurebutylester, Acrylsäure-2-ethylhexylester, Methacrylsäure-2-ethylhexylester und Styrol;
    2. b) einem Wachs auf Basis eines pflanzlichen Öls; vorzugsweise einem Wachs gewonnen durch chemische Modifikation eines pflanzlichen Öls,
    3. c) einem Wachs auf Basis gesättigter Kohlenwasserstoffe, wobei das Wachs auf Basis gesättigter Kohlenwasserstoffe vorzugsweise Octacosan umfasst oder Octacosan ist;

• - einer Barriereschicht oder einem Barrierestrich umfassend oder bestehend aus mindestens einem polymeren Bindemittel und mindestens einem Pigment, vorzugsweise mindestens einem anorganischen Pigment;
• - einer Barriereschicht oder einem Barrierestrich umfassend oder bestehend aus einem vernetzten Polysaccharid, vorzugsweise umfassend oder bestehend aus einem vernetzten Xylan;

wobei vorzugsweise die erste Barriereschicht (20 bzw. 21) und die gegebenenfalls vorhandene zweite Barriereschicht (22) voneinander verschieden sind und/oder wobei das Barrierematerial der ersten Barriereschicht (20 bzw. 21) und das Barrierematerial der gegebenenfalls vorhandenen zweiten Barriereschicht (22) jeweils voneinander verschieden sind.A metallized barrier paper according to the invention specified above (or a preferred metallized barrier paper according to the invention described in this text) is likewise preferred, the first barrier layer ( 20th or. 21st ) and / or, if a second barrier layer ( 22nd ) is present, the second barrier layer is selected or are from the group consisting of:

• - a barrier layer or a barrier screed that is applied over the entire surface to the first carrier layer or, if a second carrier layer is present, to the second carrier layer, the application weight of the barrier screed having a mass fraction of less than or equal to 5%, based on the total mass the first or the second carrier layer,

wherein the first or the second carrier layer is preferably a paper substrate and the application weight of the barrier screed has a mass fraction of less than or equal to 5%, based on the total mass of the paper substrate (lutro);

• - A barrier layer or a barrier screed comprising or consisting of a polymeric binder and a wax, preferably a wax based on a vegetable oil,
• - a barrier layer or a barrier screed comprising or consisting of a polymeric binder and at least one wax and / or at least one, preferably encapsulated, vegetable oil,
• - A barrier layer or a barrier screed comprising or consisting of
  • - an acrylate copolymer and / or
  • a wax, preferably a wax based on a vegetable oil (particularly preferably a wax obtained by chemical modification of a vegetable oil) and / or a synthetic wax; particularly preferably comprising or consisting of one, two or all components a) to c):
    1. a) an acrylate copolymer with an average molar mass in the range from 50,000 to 150,000 g / mol, the acrylate copolymer being produced from two, three, four, five, six or seven monomers selected from the group consisting of methyl acrylate and methyl methacrylate , Butyl acrylate, butyl methacrylate, 2-ethylhexyl acrylate, 2-ethylhexyl methacrylate and styrene;
    2. b) a wax based on a vegetable oil; preferably obtained from a wax by chemical modification of a vegetable oil,
    3. c) a wax based on saturated hydrocarbons, the wax based on saturated hydrocarbons preferably comprising octacosane or being octacosane;

• - a barrier layer or a barrier screed comprising or consisting of at least one polymeric binder and at least one pigment, preferably at least one inorganic pigment;
• - a barrier layer or a barrier screed comprising or consisting of a crosslinked polysaccharide, preferably comprising or consisting of a crosslinked xylan;

where preferably the first barrier layer ( 20th or. 21st ) and the possibly existing second barrier layer ( 22nd ) are different from one another and / or where the barrier material of the first barrier layer ( 20th or. 21st ) and the barrier material of the possibly present second barrier layer ( 22nd ) are different from each other.

In the context of the present invention, the term “barrier screed” refers to a coating (“coat”) applied to a carrier paper (or to a layer applied to the carrier paper, for example an intermediate layer, in particular a so-called “barrier primer”), which gives the carrier paper barrier properties receives. The barrier layer produced by the barrier screed prevents or at least considerably reduces the undesired passage of certain substances through the carrier paper. The substances whose passage through the carrier substrate is to be prevented or reduced are, in particular, mobile (e.g. pore-mobile and / or mobile due to capillary forces) hydrophilic and / or hydrophobic, possibly also amphiphilic, substances. In the context of the present invention, the term “mobile substances” preferably denotes fat and / or oil and / or water (including water vapor) and / or aromatic substances and / or odorous substances. Carrier papers finished with one or more barrier screeds are accordingly highly fat-tight and / or water- or moisture-tight and / or aroma-tight. Corresponding barrier papers are already very well suited for food applications such as food packaging, but also for other purposes where appropriate protective properties against environmental influences are important.

In the context of the present invention, the term “barrier screed” is used synonymously with the term “barrier layer coating composition”. A carrier paper that has been refined with at least one barrier screed is also known technically as "barrier paper" (a special paper).

In the context of the present invention and in accordance with the general understanding of the person skilled in the art, in particular the person skilled in the field of paper technology, the term “coating composition” denotes paints containing or consisting of binders, (mostly) additives and, if appropriate, pigments which are applied to the or a surface of a carrier substrate, preferably on the or a surface of a carrier paper or paper substrate (paper surface), or on layer (s) already applied to the or a surface of a carrier substrate, preferably on the or a surface of a carrier paper, with special Coating devices for the surface refinement or modification of the carrier substrate, preferably the carrier paper, are applied ("coated"). Papers produced in this way are known as "coated papers". In the context of the present invention, the term “coating composition” is thus the generic term for all spreadable coating compositions, preparations and / or solutions for treating, modifying or refining a substrate surface, preferably a carrier paper surface.

With regard to an above-mentioned coating composition used in a method according to the invention for producing a metallized barrier paper according to the invention, reference is made here - optionally additionally or in addition - to the preceding or following statements on the composition of the respective corresponding layers (in particular barrier layers). The corresponding coating compositions are each designed in such a way that the layers, in particular barrier layers, present in a metallized barrier paper according to the invention result therefrom. The coating compositions are usually in the form of aqueous dispersions and contain the constituents or compounds or precursor compounds (e.g. monomers or crosslinking agents) present in the individual layers, the latter (then) reacting to form the constituents.

In addition, the coating compositions can also contain other additives commonly used in papermaking, such as biocides, dispersants, release agents, defoamers or thickeners, which are added to adjust the properties of the coating composition and which usually remain in the layer produced from the coating composition. In this connection, further additives commonly used in paper manufacture can be used in the usual amounts.

For applying a coating composition to the carrier substrate, in particular the carrier paper, or to a layer already present on the carrier substrate (e.g. intermediate layer, first or second barrier layer), the person skilled in the art knows various techniques which are referred to as "painting", for example: Blade coating, coating with film press, cast coating, curtain coating, squeegee coating, air brush coating or spray coating. All of these known abovementioned painting techniques are suitable for applying the abovementioned coating compositions to a carrier substrate, preferably a carrier paper which comprises one or more precoats or intermediate coats or which also does not comprise a precoat or intermediate coat.

In one variant of a production process, the coating compositions used, in particular barrier layer coating compositions, are each dried and / or crosslinked after their application to form the corresponding layers, before another coat (or another coating composition) can optionally be applied. This embodiment of a manufacturing process is used, for example, when the coating compositions used are applied with a device for single-layer curtain coating (a “single layer curtain coater”).

In another variant of a manufacturing process, the coating compositions used (in particular barrier layer coating compositions) are applied one after the other, with the coating composition applied in each case not having to be dried and / or crosslinked to form the corresponding layer before the respective next step of the process may follow, in particular before another coat (or another coating composition) can be applied. This embodiment of the production process described above is used, for example, when the coating compositions used are applied with a device for multilayer curtain coating (a “multilayer curtain coater”).

• S21) eine auf der Rückseite des mindestens einen Trägerpapieres angeordnete erste Barriereschicht (21), vorzugsweise bestehend aus oder umfassend ein polymeres Bindemittel und ein Pigment, und
• S22) eine auf der ersten Barriereschicht angeordnete zweite Barriereschicht (22), vorzugsweise bestehend aus oder umfassend ein Acrylat-Copolymer und ein natürliches oder synthetisches Wachs.

In a first specific variant of the present invention, a metallized barrier paper according to the invention specified above (or a preferred metallized barrier paper according to the invention described in this text) is preferred, the metallized barrier paper comprising, preferably as component S2) or as a variant of component S2):

• S21) a first barrier layer arranged on the back of the at least one carrier paper ( 21st ), preferably consisting of or comprising a polymeric binder and a pigment, and
• S22) a second barrier layer arranged on the first barrier layer ( 22nd ), preferably consisting of or comprising an acrylate copolymer and a natural or synthetic wax.

In this first specific variant, an organic pigment, an inorganic pigment or a mixture of organic pigment and inorganic pigment is preferred as the pigment in the first barrier layer (S21)). In this variant, the pigment particularly preferably comprises or is an inorganic pigment selected from the list consisting of calcined kaolin, kaolin, kaolinite, magnesium silicate hydrate, silicon oxide, bentonite, calcium carbonate, calcium silicate hydrates (preferably made from the minerals tobermorite and / or xonotlite), calcium aluminate sulfate (preferably according to CAS No. 12004-14-7); Aluminum hydroxide, aluminum oxide and boehmite. It is particularly preferred if the pigment in the first barrier layer is shaped like a platelet (for more details, see above).

In this first specific variant, an acrylate polymer (polyacrylate) or acrylate copolymer is preferred as the polymeric binder in the first barrier layer (S21)), preferably an anionic acrylate polymer or an anionic acrylate copolymer. Particularly preferably, the polymeric binder in the first barrier layer is or comprises a copolymer which is produced or is selected using one, two, three or all monomers from the group consisting of butyl methacrylate, butyl acrylate, methacrylonitrile, acrylonitrile, α-methylstyrene and styrene . The polymeric binder in the first barrier layer is very particularly preferably or comprises a copolymer which is or is produced using butyl acrylate, acrylonitrile and styrene.

In this first specific variant, the preferred acrylate copolymer in the second barrier layer (S22)) is an acrylate copolymer made from methyl acrylate, methyl methacrylate, butyl acrylate, butyl methacrylate, 2-ethylhexyl acrylate, 2-ethylhexyl methacrylate and / or styrene because it has particularly good barrier properties and is particularly well compatible with the wax or especially with the synthetic wax based on saturated hydrocarbons. In addition to the aforementioned monomers, further monomers may have been used to produce the acrylate copolymer or the copolymer was preferably produced from two, three, four, five, six or all of the monomers selected from the group consisting of methyl acrylate, methyl methacrylate, butyl acrylate, butyl methacrylate, 2-ethylhexyl acrylic acid, 2-ethylhexyl methacrylic acid and styrene.

In a preferred embodiment of this first specific variant, a metalized barrier paper according to the invention specified here above (or a preferred metalized barrier paper according to the invention described in this text) is therefore preferred (comprising the components S21) and S22)), the second barrier layer comprising a wax and wherein the wax in the second barrier layer comprises or is a synthetic wax, preferably a wax made from saturated hydrocarbons,
wherein the wax in the second barrier layer particularly preferably contains or consists of one, two, three or more than three alkanes selected from the group consisting of heneicosane, docosane, tricosane, tetracosane, pentacosane, hexacosane, heptacosane, octacosane, nonacosane, triacontane, Hentriacontane, Dotriacontane, Tritriacontane, Tetratriacontane, Pentatriacontane, Hexatriacontane, Heptatriacontane, Octatriacontane and Nonatriacontane.

In a further preferred embodiment of this first specific variant, a metalized barrier paper according to the invention specified above (or a preferred metalized barrier paper according to the invention described in this text) is preferred (comprising the components S21) and S22)), the second barrier layer comprising an acrylate copolymer and wherein the acrylate copolymer in the second barrier layer comprises or is a copolymer made using two, three, four, five, six or all of the monomers selected from the group consisting of methyl acrylate, methyl methacrylate, butyl acrylate, butyl methacrylate, 2-ethylhexyl acrylate, 2-ethylhexyl methacrylate and styrene.

It has been shown that the combination of a pigment layer (first barrier layer, S21) and a wax layer (second barrier layer, S22)) according to this first specific variant of the invention leads to extremely low water vapor permeability and particularly high water vapor permeability and fat resistance leads. At the same time, a metallized barrier paper according to the first specific variant of the present invention described here is mostly easy to recycle, since the corresponding barrier layers contain no foils, in particular no plastic or aluminum foils.

• Eine zweite wie vorstehend angegebene spezifische Variante der vorliegenden Erfindung betrifft ein erfindungsgemäßes metallisiertes Barrierepapier, umfassend,
• S1) mindestens ein Trägerpapier (10), aufweisend eine Vorderseite und eine der Vorderseite gegenüberliegende Rückseite,
  1. (i) wobei das Trägerpapier einen Kurzfaser-Zellstoff mit einem Schopper-Riegler-Grad von mindestens 30°SR und einen Langfaser-Zellstoff mit einem Schopper-Riegler-Grad von mindestens 25°SR aufweist und wobei das Trägerpapier mindestens einen Massenanteil von 50 % Kurzfaser-Zellstoff umfasst, bezogen auf die Gesamtmasse aus Kurzfaser-Zellstoff und Langfaser-Zellstoff; und/oder
  2. (ii) wobei das Trägerpapier bei einem Druck (angegeben als sog. Linienlast in kN/m) von mindestens 40 kN/m und einer Temperatur von mindestens 25 °C kalandriert wurde; und/oder
  3. (iii) wobei das Trägerpapier auf einer oder auf beiden Seiten vollflächig mit Stärke imprägniert ist; und
• S2) eine auf der Rückseite des mindestens einen Trägerpapieres angeordnete erste Barriereschicht (20 bzw. 21) oder einen entsprechenden Barrierestrich, die bzw. der auf dem (gegebenenfalls mit Stärke imprägnierten) Trägerpapier (oder, sofern auf dem Trägerpapier eine Zwischenschicht vorhanden ist, auf der Zwischenschicht) vollflächig aufgebracht ist, wobei das Auftragsgewicht des Barrierestrichs einen Masseanteil von weniger als oder gleich 5 % aufweist, bezogen auf die Gesamtmasse des Trägerpapieres und der Barriereschicht (lutro),

wobei vorzugsweise das Flächengewicht des Trägerpapieres einschließlich einer Barriereschicht im Bereich von 30 bis 250 g/m² (lutro) liegt.The specific variants of the present invention specified below are preferred, which relate to a previously specified metallized barrier paper according to the invention (or a preferred metallized barrier paper according to the invention described in this text), wherein the metallized barrier paper has at least one first barrier layer ( 20th or. 21st ) includes:

• A second specific variant of the present invention as indicated above relates to a metallized barrier paper according to the invention, comprising
• S1) at least one backing paper ( 10 ), having a front side and a rear side opposite the front side,
  1. (i) wherein the carrier paper has a short fiber pulp with a Schopper-Riegler degree of at least 30 ° SR and a long fiber pulp with a Schopper-Riegler degree of at least 25 ° SR and wherein the carrier paper has at least a mass fraction of 50% Short fiber pulp comprises, based on the total mass of short fiber pulp and long fiber pulp; and or
  2. (ii) where the carrier paper was calendered at a pressure (indicated as so-called line load in kN / m) of at least 40 kN / m and a temperature of at least 25 ° C; and or
  3. (iii) the backing paper being fully impregnated with starch on one or both sides; and
• S2) a first barrier layer arranged on the back of the at least one carrier paper ( 20th or. 21st ) or a corresponding barrier screed that is applied over the entire surface of the carrier paper (optionally impregnated with starch) (or, if there is an intermediate layer on the carrier paper, on the intermediate layer), the application weight of the barrier screed being a mass fraction of less than or equals 5%, based on the total mass of the carrier paper and the barrier layer (lutro),

the weight per unit area of the carrier paper including a barrier layer preferably being in the range from 30 to 250 g / m ² (lutro).

Preferably, the or a barrier screed according to the second specific variant of the present invention described here comprises at least one of the components selected from the group consisting of polymethacrylate, polyacrylate (polyacrylic acid ester), polystyrene, polybutadiene, polyethylene, polyvinyl acetate, polyvinyl alcohol, polyacrylonitrile, natural wax, synthetic Wax and mixtures of these components

It has been shown that a metallized barrier paper according to the invention according to the second specific variant of the present invention described here, comprising a barrier layer as described above, has a very high resistance to fat and / or oil and / or moisture. Due to the design of the paper substrate, the calendering of the paper substrate and / or the impregnation of the paper substrate with starch, it is possible for the barrier screed to have a very high barrier effect against fat and / or oil and / or moisture despite the low application weight of the barrier screed.

A third specific variant of the present invention as specified above relates to a metallized barrier paper according to the invention comprising at least one barrier layer ( 20th or. 21st ), wherein the at least one barrier layer comprises or consists of a polymeric binder (as indicated above) and a wax based on a vegetable oil (as indicated above).

In this variant, a wax based on an oil is preferred as the wax based on a vegetable oil, which is selected from the list comprising palm oil, coconut oil, poppy seed oil, olive oil, linseed oil, soybean oil, sunflower oil, safflower oil and rapeseed oil, particularly preferably the wax based on a vegetable oil in this variant is a wax based on a soybean oil, ie soybean oil wax or soy wax.

In this variant, a crosslinked or uncrosslinked binder is preferred as the polymeric binder, selected from the group consisting of the subgroups G1) and / or G2) described or defined above. In this variant, a polymeric binder which comprises or consists of one or more styrene-acrylate polymers is particularly preferred as the polymeric binder.

It has been shown that a metallized barrier paper according to the invention according to the third specific variant specified above has a high resistance to fats and / or oils and / or moisture and can be produced at least predominantly from renewable raw materials. By using a polymeric binder, surprisingly, the barrier layer is formed in such a way that it does not become detached from the backing paper or that the wax passes onto other objects, such as food.

A fourth specific variant of the present invention as indicated above relates to a metallized barrier paper according to the invention comprising at least one barrier layer ( 20th or. 21st ), the at least one barrier layer being a crosslinked or uncrosslinked polymeric binder (as stated above, ie preferably selected from subgroup G1), G2) and / or G3)) and at least one wax and / or at least one (preferably encapsulated) vegetable oil (as indicated above) includes or consists of.

In this variant, the wax based on a vegetable oil is preferably a wax selected from the list consisting of palm oil, coconut oil, poppy seed oil, olive oil, linseed oil, soybean oil, sunflower oil, safflower oil and rapeseed oil; The wax based on a vegetable oil is preferably a wax based on a soybean oil, i. H. around soybean oil wax or soy wax. Carnauba wax is also preferred as a wax based on a vegetable oil in this variant.

It is preferred in this variant if the at least one barrier layer comprises at least one vegetable oil instead of the at least one wax or in addition to the at least one wax. A preferred vegetable oil in this variant is an oil selected from the list consisting of palm oil, coconut oil, poppy seed oil, olive oil, linseed oil, soybean oil, sunflower oil, safflower oil and rapeseed oil or a mixture thereof; the vegetable oil is preferably sunflower oil, soybean oil , Palm oil and / or rapeseed oil.

In this variant, it is also preferred if the at least one wax and / or the at least one vegetable oil is at least partially covered with a polymer or completely enveloped by this (for more details, see above).

It is also preferred in this variant if the at least one barrier layer ( 20th or. 21st ) in addition to the at least one vegetable oil comprises a wax based on saturated hydrocarbons. It has been shown that the combination of a wax based on a vegetable oil with a wax based on saturated hydrocarbons leads to particularly good resistance of a resulting barrier layer to fats and / or oils and / or moisture and / or water or water vapor. The combination of saturated hydrocarbons and waxes from fatty acid triglyceride seems to lead to layers with particularly high molecular densities. The combination of a wax based on a vegetable oil and a wax based on saturated hydrocarbons has a synergistic effect, which leads to particularly good resistance to fats and / or oils and / or moisture and / or water or water vapor. This synergistic effect is particularly pronounced when the wax based on saturated hydrocarbons is octacosan and / or the wax based on a vegetable oil is a wax based on soybean oil.

It has been shown that according to this third specific variant described here, a low water and water vapor permeability as well as a high fat and water resistance of a barrier layer can be brought about.

It has also been shown that in a metallized barrier paper according to the invention the at least one barrier layer according to the fourth specific variant described here is particularly suitable for combination or for use with a paper substrate described above which comprises cellulose fibers, the mass fraction of the cellulose fibers being ≥ 90%, based on the total mass of the paper substrate and determined as the oven-dry mass fraction; or with an above-described paper substrate which comprises cellulose fibers, at least some of the cellulose fibers consisting of grass fibers.

• Eine fünfte wie vorstehend angegebene spezifische Variante der vorliegenden Erfindung betrifft demnach ein erfindungsgemäßes metallisiertes Barrierepapier umfassend mindestens eine erste Barriereschicht (20 bzw. 21) und eine zweite Barriereschicht (22),

wobei eine der beiden Barriereschichten ein vernetztes Polysaccharid (im Folgenden auch als „Polysaccharid-Schicht“ bezeichnet) umfasst und die jeweils andere der beiden Barriereschichten (im Folgenden auch als „Zweitschicht“ bezeichnet)

• i) ein Acrylat-Copolymer und/oder
• (ii) ein Wachs auf Basis eines pflanzlichen Öls

umfasst oder daraus besteht.The fifth specific variant of the present invention given below is (as well as the first specific variant described above) particularly preferred as a variant which relates to a metallized barrier paper according to the invention specified here above (or a preferred metallized barrier paper according to the invention described in this text), wherein the metallized barrier paper has a first barrier layer ( 20th or. 21st ) and a, preferably over the entire surface, applied to the first barrier layer and in contact with it, second barrier layer ( 22nd ) and wherein the first and second barrier layers are each different from one another:

• A fifth specific variant of the present invention, as indicated above, accordingly relates to a metallized barrier paper according to the invention comprising at least one first barrier layer ( 20th or. 21st ) and a second barrier layer ( 22nd ),

wherein one of the two barrier layers comprises a cross-linked polysaccharide (hereinafter also referred to as "polysaccharide layer") and the other of the two barrier layers (hereinafter also referred to as "second layer")

• i) an acrylate copolymer and / or
• (ii) a wax based on a vegetable oil

includes or consists of.

In this variant, it is preferred if the crosslinked polysaccharide is a crosslinked xylan or contains a crosslinked xylan, preferably is a crosslinked arabinoxylan or contains a crosslinked arabinoxylan. It is particularly preferred in this variant if the xylan is a xylan from wheat and / or barley husks, since these have a particularly good barrier effect against oxygen when used in a barrier layer.

It is further preferred in this variant if the crosslinked polysaccharide comprises or is a mixture of crosslinked starch and crosslinked xylan. It is particularly preferred if a mixture of starch and xylan (preferably arabinoxylan) is crosslinked, so that crosslinking also takes place between starch and xylan molecules. It is further particularly preferred if more starch than xylan is used, i. E. the starch content in the first barrier layer is higher than the xylan content. When considering the proportion of starch and the proportion of xylan, reference is made to the respective mass proportions before crosslinking. For further preferred embodiments and further advantages according to this fourth specific variant of the present invention described here, reference is made to the above explanations on crosslinked polysaccharides as barrier material which can be used according to the invention.

It has been shown that it is advantageous if a polymeric binder is also present in the second layer in addition to the wax. All binders customary in papermaking are suitable as polymeric binders which can be present in the second layer in addition to the wax. However, it has been shown that a suitable selection of the polymeric binder can significantly improve the mechanical properties of the barrier layer. It is advantageous and therefore preferred according to the invention if the polymeric binder, which can be present in the second layer in addition to the wax, is a crosslinked or uncrosslinked binder, selected from the above-specified or defined subgroups G1) and / or G2.

It has also been shown that it is particularly advantageous if the polymeric binder, which can be present in the second layer in addition to the wax, consists of two or more polymeric binders and at least one polymeric binder is an anionic binder. In this (special) context, an anionic binder is understood to mean a binder that contains several negative charges that are stabilized by cations (e.g. metal cations or ammonium). Suitable anionic binders that are present in the second layer in addition to the wax are, for example, partially or fully deprotonated polyacrylic acid (or copolymers thereof, for example with acrylic esters), partially or fully deprotonated polymethacrylic acid (or copolymers thereof, for example with methacrylic esters), Copolymers of polyacrylic acid ester (preferably methyl or ethyl ester), copolymers of polymethacrylic acid ester (preferably methyl or ethyl ester) or polyacrylamides or copolymers thereof.

In this variant it is preferred if the second layer comprises or consists of one or more acrylate copolymers, preferably one or more styrene-acrylate copolymers, and a wax based on a vegetable oil, preferably a wax based on soybean oil.

It has been shown that the combination of a polysaccharide layer comprising a crosslinked polysaccharide and a second layer consisting of or comprising an acrylate copolymer, a wax based on a vegetable oil, or a mixture of acrylate copolymer and a wax based on a vegetable oil, causes a particularly low gas permeability, in particular to water vapor and oxygen, and also a particularly good barrier effect against fats, oils and water. The combination of the polysaccharide layer and the second layer has a synergistic barrier effect, which is apparently not only due to the presence of two layers or the resulting thickness of both layers.

The metal layer S3) of the metallized barrier paper according to the invention can be on the front side of the carrier paper S1) ( 10 ), on an intermediate layer arranged on the front side of the (or a) carrier paper S1) or on the surface (facing away from the rear side of the carrier paper) of an or the outermost barrier layer S2) ( 20th or. 21st , 22nd ) be arranged. The metal layer S3) of the metallized barrier paper according to the invention is preferably on the surface (facing away from the back of the carrier paper) of one or the outermost barrier layer S2) ( 20th or. 21st , 22nd ) arranged. The metal layer is preferably arranged over the full area on the (at least one) carrier paper, because in this way the barrier effect can generally be used or used most effectively.

If the metal layer on the front of the backing paper S1) ( 10 ) or is arranged on an intermediate layer arranged on the front side of the carrier paper S1), a desired optical effect can be achieved through the metallization that is usually visible on the surface of the barrier paper according to the invention, which under certain circumstances can be further enhanced if on the metal layer as another Layer another printing layer is applied. The surface of such a printing layer can then have a metallic luster.

If the metal layer S3) of the metallized barrier paper according to the invention is on the surface (facing away from the back of the carrier paper) of a or the outermost barrier layer S2) ( 20th or. 21st , 22nd ) is arranged, such a metallized barrier paper has a particularly good or (compared to other arrangements or compared to the prior art) even further improved barrier effect, in particular against the penetration of water, steam, fats, oils and / or smells. Such a metallized barrier paper also has excellent temperature-insulating properties.

• - das Barrierepapier als zusätzlichen, schichtförmig angeordneten, Bestandteil umfasst:
  • S4) mindestens eine (jeweils) unterhalb der bzw. einer Metallschicht (30) angeordnete Klebeschicht (40),
  und/oder
  • - die schichtförmigen Bestandteile des Barrierepapieres in der Schichten-Reihenfolge S1), S2) (bzw. gemäß vorstehend beschriebener Varianten: sofern vorhanden S21), S22)), sofern vorhanden S4), und S3) angeordnet sind.

Accordingly, a metallized barrier paper according to the invention specified above (or a preferred metallized barrier paper according to the invention described in this text) is also preferred, wherein

• - The barrier paper as an additional, layered component comprises:
  • S4) at least one (each) below the or a metal layer ( 30th ) arranged adhesive layer ( 40 ),
  and or
  • the layered components of the barrier paper are arranged in the layer sequence S1), S2) (or according to the variants described above: if available S21), S22)), if available S4), and S3).

The metal layer ( 30th ) can be achieved by using an adhesive ( 40 ) or by vapor deposition of the metal on the respectively desired side or surface of the carrier paper or barrier layer (as described above). The metal layer ( 30th ) can also be vapor-deposited onto an adhesive layer previously applied (on the respectively desired side or surface of the carrier paper or barrier layer, as described above).

If the metal layer specified above is achieved by or using an adhesive ( 40 ) was applied, then below the or a metal layer ( 30th ), e.g. between the backing paper ( 10 ) and the Metal layer ( 30th ) or between the back of the at least one barrier layer ( 20th ) (or, if the metallized barrier paper comprises two or more barrier layers, on the back of the second or on the back of the outermost barrier layer) and the metal layer ( 30th ) an adhesive ( 40 ) arranged that the metal layer ( 30th ) with the backing paper ( 10 ) or connects to the barrier layer. The adhesive is preferably ( 40 ) a polyurethane adhesive.

According to the invention, a metallized barrier paper is preferred in which the adhesive ( 40 ) is a polyurethane adhesive. It has been shown that polyurethane adhesives have the best properties for applying a metal layer ( 30th ) to stick to the backing paper or to enable or support its attachment. It is particularly important that the adhesive has good adhesive properties both on the backing paper ( 10 ) or on the barrier layer ( 20th or. 21st ; 22nd ) as well as on the metal layer ( 30th ) and even after storage no reaction with the metal layer ( 30th ) or a diffusion of the adhesive ( 40 ) or individual components of the adhesive layer ( 40 ) takes place in other layers. Especially when using an aluminum layer as the metal layer ( 30th ) the use of a polyurethane adhesive is particularly preferred.

The advantage of using an adhesive layer between the metal layer and the carrier paper or the barrier layer is that it allows the use of carrier papers that do not have sufficient surface smoothness and / or do not have sufficient resistance to the conditions prevailing during vapor deposition of the metal. The use of an adhesive layer thus has the advantage that unevenness in the carrier paper is evened out by the adhesive layer. Another advantage of using an adhesive layer is the reinforcement of the adhesive contact between the metal layer and the layer underneath (or under the metal layer) (optionally the front side of the carrier paper S1), an intermediate layer arranged on the front side of the carrier paper or the (the Back of the backing paper facing away from the surface of a or the outermost barrier layer).

Vapor deposition of the metal (directly on the or a barrier layer or on the carrier paper) has the advantage, however, that an additional adhesive layer can be dispensed with. In this way, it is also possible, in particular, to produce metallized barrier papers which have a particularly small thickness and a particularly low weight per unit area.

Likewise preferred is an inventive metallized barrier paper specified above (or a preferred inventive metallized barrier paper described in this text), wherein the at least one metal layer ( 30th ), preferably the one metal layer ( 30th ), on the back of the at least one barrier layer ( 20th ), or, if the metallized barrier paper comprises two or more barrier layers, is arranged on the back of the second or on the back of the outermost barrier layer (which is not in contact with another barrier layer), preferably over the entire surface.

• - ausgewählt ist aus der Gruppe bestehend aus
  • - Aluminiumschicht,
  • - Kupferschicht,
  • - Silberschicht,
  • - Goldschicht,
  • - Metalllegierungsschicht, vorzugsweise Bronzeschicht und
  • - deren Kombinationen
  und vorzugsweise eine Aluminiumschicht umfasst oder ist, und/oder
• - eine Schichtdicke im Bereich von 0,5 bis 250 nm, vorzugsweise von 1 bis 200 nm, besonders bevorzugt von 5 bis 100 nm, aufweist.

Furthermore, a metallized barrier paper according to the invention specified above is preferred (or a preferred metallized barrier paper according to the invention described in this text), wherein the at least one metal layer:

• - is selected from the group consisting of
  • - aluminum layer,
  • - copper layer,
  • - silver layer,
  • - gold layer,
  • - Metal alloy layer, preferably bronze layer and
  • - their combinations
  and preferably comprises or is an aluminum layer, and / or
• - Has a layer thickness in the range from 0.5 to 250 nm, preferably from 1 to 200 nm, particularly preferably from 5 to 100 nm.

It has been shown that the metal layers specified above can be applied particularly well to, in particular, one (ie in particular the outermost) barrier layer of a barrier paper, and can be applied well adhere to the corresponding surfaces. An aluminum layer is particularly advantageous as a metal layer because it combines very good barrier properties with good temperature-insulating properties and economic costs.

• S1) mindestens ein Trägerpapier, aufweisend eine Vorderseite und eine der Vorderseite gegenüberliegende Rückseite,
• S21) eine auf der Rückseite des mindestens einen Trägerpapieres angeordnete erste Barriereschicht, vorzugsweise bestehend aus oder umfassend ein polymeres Bindemittel und ein Pigment,
• S22) eine auf der ersten Barriereschicht angeordnete zweite Barriereschicht, vorzugsweise bestehend aus oder umfassend ein Acrylat-Copolymer und ein Wachs,
• S3) eine auf der Rückseite der zweiten Barrierereschicht, vorzugsweise vollflächig, angeordnete Metallschicht. und vorzugsweise
• S4) eine unterhalb der Metallschicht, zwischen der Metallschicht und der Rückseite der zweiten Barrierereschicht, angeordnete Klebeschicht.

In a specific embodiment of the present invention, an above-specified metallized barrier paper according to the invention (or a preferred metallized barrier paper according to the invention described in this text) is preferred, at least comprising the following components arranged in layers:

• S1) at least one carrier paper, having a front side and a rear side opposite the front side,
• S21) a first barrier layer arranged on the rear side of the at least one carrier paper, preferably consisting of or comprising a polymeric binder and a pigment,
• S22) a second barrier layer arranged on the first barrier layer, preferably consisting of or comprising an acrylate copolymer and a wax,
• S3) a metal layer arranged on the back of the second barrier layer, preferably over the entire surface. and preferably
• S4) an adhesive layer arranged below the metal layer, between the metal layer and the rear side of the second barrier layer.

The present invention also relates to an article comprising or consisting of a metallized barrier paper according to the invention specified above (or a preferred metallized barrier paper according to the invention described in this text), wherein the article is preferably selected from the group consisting of packaging paper, wrapping paper, wrapping paper, bags , Bags, sachets, backing paper, interleaving paper and release paper.

With regard to preferred configurations and possible combinations of preferred configurations of the article according to the invention, the explanations given above for the metallized barrier paper according to the invention apply accordingly (if necessary in a corresponding manner), and vice versa.

• V1) Herstellen oder Bereitstellen eines Barrierepapieres, umfassend
  • - mindestens ein Trägerpapier (10), aufweisend eine Vorderseite und eine der Vorderseite gegenüberliegende Rückseite und
  • - mindestens eine auf der Rückseite des mindestens einen Trägerpapieres angeordnete Barriereschicht (20), umfassend mindestens ein Barrierematerial, ausgewählt aus der Gruppe bestehend aus:
    • - vernetzte oder unvernetzte polymere Bindemittel, vorzugsweise ausgewählt aus der Gruppe bestehend aus
      • - Polyacrylate,
      • - Polymethacrylate,
      • - Acrylat-Copolymere, wobei vorzugsweise deren Monomere jeweils unabhängig voneinander ausgewählt sind aus der Gruppe bestehend aus Acrylsäurealkylester, Methacrylsäurealkylester, Acrylnitril, Methacrylnitril, Styrol, α-Methylstyrol und deren Gemische,
      • - Polystyrole,
      • - Polybutadiene, und
      • - deren Gemische;
    • - natürliche Wachse,
    • - synthetische Wachse,
    • - pflanzliche Öle,
    • - vorzugsweise organische Pigmente,
    • - anorganische Pigmente,
    • - vernetzte Polysaccharide, und
    • - deren Mischungen,
    und
• V2a) Herstellen oder Bereitstellen eines Mehrschichtverbundes aus einer Metallschicht (30), einer Trennschicht und einer Trägerschicht,
• V3a) Beschichten mit einem Klebstoff (40):
  • - der Vorderseite des mindestens einen Trägerpapieres (10) des Barrierepapieres (oder einer darauf angeordneten Zwischenschicht, jeweils als Bestandteil des Mehrschichtverbundes) und/oder
  • - der Rückseite der mindestens einen Barrierereschicht (20), oder, sofern das hergestellte oder bereitgestellte Barrierepapier zwei oder mehr Barriereschichten umfasst, der Rückseite der zweiten bzw. der Rückseite der jeweils äußersten Barriereschicht (jeweils als Bestandteil des Mehrschichtverbundes), und/oder
  • - der Metallschicht (30) des Mehrschichtverbundes,
• V4a) Aufkaschieren des, ggf. mit dem Klebstoff (40) beschichteten, Mehrschichtverbundes auf:
  • - die Vorderseite des, ggf. mit dem Klebstoff (40) beschichteten, mindestens einen Trägerpapieres (10) des Barrierepapieres (bzw. einer darauf angeordneten Zwischenschicht), so dass der Klebstoff (40) zwischen der Vorderseite des Trägerpapieres (10) (bzw. der Zwischenschicht) und der Metallschicht (30) angeordnet ist, und/oder
  • - die, ggf. mit dem Klebstoff (40) beschichtete, Rückseite der mindestens einen Barrierereschicht (20), oder, sofern das hergestellte oder bereitgestellte Barrierepapier zwei oder mehr Barrierereschichten umfasst, auf die Rückseite der zweiten bzw. auf die Rückseite der jeweils äußersten Barriereschicht,
• V5a) teilweises oder vollständiges Trocknen bzw. Aushärten des Klebstoffes (40), so dass mindestens eine Klebeschicht (40) resultiert,
• V6a) Entfernen der Trägerschicht und der Trennschicht, so dass nur die Metallschicht (30) auf der Klebeschicht (40) verbleibt und
• V7a) vorzugsweise Corona-Behandlung der Metallschicht (30), so dass ein metallisiertes Barrierepapier resultiert; oder (nach einem alternativen Verfahren zur Herstellung eines metallisierten Barrierepapieres, umfassend die folgenden, nach Schritt V1) auszuführenden Schritte:)
• V2b) vorzugsweise Beschichten mit einem Klebstoff (40):
  • - der Vorderseite des mindestens einen Trägerpapieres (10) des Barrierepapieres (bzw. einer darauf jeweils angeordneten Zwischenschicht) und/oder
  • - der Rückseite der mindestens einen Barrierereschicht (20), oder, sofern das hergestellte oder bereitgestellte Barrierepapier zwei oder mehr Barrierereschichten umfasst, der Rückseite der zweiten bzw. der Rückseite der jeweils äußersten Barriereschicht, und vorzugsweise teilweises oder vollständiges Trocknen bzw. Aushärten des Klebstoffes (40), so dass mindestens eine Klebeschicht (40) resultiert,
• V3b) Beschichten mit einer Metallschicht (30) durch physikalische Gasphasenabscheidung:
  • - der Rückseite der mindestens einen Barrierereschicht (20), oder, sofern das hergestellte oder bereitgestellte Barrierepapier zwei oder mehr Barrierereschichten umfasst, der Rückseite der zweiten bzw. der jeweils äußersten Barriereschicht, oder, sofern in Schritt V3b) eine Klebeschicht (40) auf einer Barriereschicht resultiert,
  • - der auf der Rückseite der mindestens einen Barrierereschicht (20), oder, sofern das hergestellte oder bereitgestellte Barrierepapier zwei oder mehr Barrierereschichten umfasst, der auf der Rückseite der zweiten bzw. der jeweils äußersten Barriereschicht, angeordneten Klebeschicht (40), und/oder
  • - der Vorderseite des mindestens einen Trägerpapieres (10) des Barrierepapieres, oder, sofern in Schritt V3b) eine Klebeschicht (40) auf einer Barriereschicht resultiert,
  • - der auf der Vorderseite des Trägerpapieres (10) angeordneten Klebeschicht (40), so dass ein metallisiertes Barrierepapier resultiert.

The present invention also relates to a method for producing a metallized barrier paper, preferably a metallized barrier paper according to the invention specified above (or a preferred metallized barrier paper according to the invention described in this text), comprising the following steps:

• V1) producing or providing a barrier paper, comprising
  • - at least one backing paper ( 10 ), having a front side and a rear side opposite the front side and
  • - at least one barrier layer arranged on the back of the at least one carrier paper ( 20th ), comprising at least one barrier material selected from the group consisting of:
    • - Crosslinked or uncrosslinked polymeric binders, preferably selected from the group consisting of
      • - polyacrylates,
      • - polymethacrylates,
      • - Acrylate copolymers, the monomers of which are preferably each independently selected from the group consisting of acrylic acid alkyl esters, methacrylic acid alkyl esters, acrylonitrile, methacrylonitrile, styrene, α-methylstyrene and mixtures thereof,
      • - polystyrene,
      • - Polybutadiene, and
      • - their mixtures;
    • - natural waxes,
    • - synthetic waxes,
    • - vegetable oils,
    • - preferably organic pigments,
    • - inorganic pigments,
    • - crosslinked polysaccharides, and
    • - their mixtures,
    and
• V2a) Production or provision of a multilayer composite from a metal layer ( 30th ), a separating layer and a carrier layer,
• V3a) Coating with an adhesive ( 40 ):
  • - the front of the at least one carrier paper ( 10 ) the barrier paper (or an intermediate layer arranged thereon, in each case as part of the multilayer composite) and / or
  • - the back of the at least one barrier layer ( 20th ), or, if the barrier paper produced or provided comprises two or more barrier layers, the rear side of the second or the rear side of the respective outermost barrier layer (in each case as part of the multilayer composite), and / or
  • - the metal layer ( 30th ) of the multilayer composite,
• V4a) Laminating the, if necessary with the adhesive ( 40 ) coated, multi-layer composite on:
  • - the front of the, possibly with the adhesive ( 40 ) coated, at least one backing paper ( 10 ) of the barrier paper (or an intermediate layer arranged on it) so that the adhesive ( 40 ) between the front of the backing paper ( 10 ) (or the intermediate layer) and the metal layer ( 30th ) is arranged, and / or
  • - the, possibly with the adhesive ( 40 ) coated rear side of the at least one barrier layer ( 20th ), or, if the barrier paper produced or provided comprises two or more barrier layers, on the back of the second or on the back of the outermost barrier layer,
• V5a) partial or complete drying or curing of the adhesive ( 40 ) so that at least one adhesive layer ( 40 ) results,
• V6a) Removal of the carrier layer and the separating layer so that only the metal layer ( 30th ) on the adhesive layer ( 40 ) remains and
• V7a) preferably corona treatment of the metal layer ( 30th ), so that a metallized barrier paper results; or (according to an alternative process for producing a metallized barrier paper, comprising the following steps to be carried out after step V1) :)
• V2b) preferably coating with an adhesive ( 40 ):
  • - the front of the at least one carrier paper ( 10 ) of the barrier paper (or an intermediate layer arranged thereon) and / or
  • - the back of the at least one barrier layer ( 20th ), or, if the barrier paper produced or provided comprises two or more barrier layers, the back of the second or the back of the outermost barrier layer, and preferably partial or complete drying or hardening of the adhesive ( 40 ) so that at least one adhesive layer ( 40 ) results,
• V3b) Coating with a metal layer ( 30th ) through physical vapor deposition:
  • - the back of the at least one barrier layer ( 20th ), or, if the barrier paper produced or provided comprises two or more barrier layers, the back of the second or outermost barrier layer, or, if in step V3b) an adhesive layer ( 40 ) results on a barrier layer,
  • - the one on the back of the at least one barrier layer ( 20th ), or, if the barrier paper produced or made available comprises two or more barrier layers, the adhesive layer arranged on the back of the second or outermost barrier layer ( 40 ), and or
  • - the front of the at least one carrier paper ( 10 ) of the barrier paper, or, if in step V3b) an adhesive layer ( 40 ) results on a barrier layer,
  • - the one on the front of the backing paper ( 10 ) arranged adhesive layer ( 40 ), so that a metallized barrier paper results.

With regard to preferred configurations and possible combinations of preferred configurations of the method according to the invention for producing a metallized barrier paper, the explanations given above for the metallized barrier paper according to the invention and / or for the article according to the invention apply accordingly (if necessary, in a similar manner), and vice versa.

In the context of the present invention, physical vapor deposition (English physical vapor deposition, abbreviated to "PVD") is understood to mean a process known per se in which a metal is converted into the gas phase using physical processes and then to the substrate to be coated (carrier paper or on it arranged intermediate layer or barrier layer), where the metal condenses and the metal layer ( 30th ) forms.

A method according to the invention is likewise preferred, the carrier layer of the multilayer composite being a polyester carrier.

• - zur Verminderung der Wasserdampfdurchlässigkeit, und/oder
• - zur Erhöhung der temperaturisolierenden Eigenschaften, und/oder
• - zur Verbesserung der Heißsiegelfähigkeit eines Barrierepapieres, welches mindestens die folgenden Bestandteile umfasst:
  • S1) mindestens ein Trägerpapier (10), aufweisend eine Vorderseite und eine der Vorderseite gegenüberliegende Rückseite,

In addition, the present invention also relates to the use of a metal layer, preferably selected from the group consisting of aluminum layer, copper layer, silver layer, gold layer, metal alloy layer, preferably bronze layer; and combinations of the aforementioned metal layers,

• - to reduce the water vapor permeability, and / or
• - To increase the temperature-insulating properties, and / or
• - To improve the heat sealability of a barrier paper, which comprises at least the following components:
  • S1) at least one backing paper ( 10 ), having a front side and a rear side opposite the front side,

• - vernetze oder unvernetzte polymere Bindemittel, vorzugsweise ausgewählt aus der Gruppe bestehend aus
• - Polyacrylate,
• - Polymethacrylate,
• - Acrylat-Copolymere, wobei vorzugsweise deren Monomere jeweils unabhängig voneinander ausgewählt sind aus der Gruppe bestehend aus Acrylsäurealkylester, Methacrylsäurealkylester, Acrylnitril, Methacrylnitril, Styrol, α-Methylstyrol und deren Gemische,
• - Polystyrole,
• - Polybutadiene, und
• - deren Gemische;
• - natürliche Wachse,
• - synthetische Wachse,
• - pflanzliche Öle,
• - vorzugsweise organische Pigmente,
• - anorganische Pigmente,
• - vernetzte Polysaccharide, und
• - deren Mischungen.

S2) at least one barrier layer arranged on the back of the at least one carrier paper ( 20th ), comprising at least one barrier material selected from the group consisting of:

• - crosslinked or uncrosslinked polymeric binders, preferably selected from the group consisting of
• - polyacrylates,
• - polymethacrylates,
• - Acrylate copolymers, preferably their monomers are each independently selected from the group consisting of acrylic acid alkyl ester, methacrylic acid alkyl ester, acrylonitrile, methacrylonitrile, styrene, α-methylstyrene and mixtures thereof,
• - polystyrene,
• - Polybutadiene, and
• - their mixtures;
• - natural waxes,
• - synthetic waxes,
• - vegetable oils,
• - preferably organic pigments,
• - inorganic pigments,
• - crosslinked polysaccharides, and
• - their mixtures.

With regard to preferred configurations and possible combinations of preferred configurations of the use of a metal layer according to the invention, the explanations given above for the metallized barrier paper according to the invention, for the article according to the invention and / or for the method according to the invention for producing a metallized barrier paper apply accordingly (if necessary, analogously), and vice versa.

• - das Verpackungsmaterial ausgewählt ist aus der Gruppe bestehend aus Verpackungspapier, Packpapier, Einschlagpapier, Beutel, Tüten, Sachets, Unterlegpapier, Zwischenlegepapier und Trennpapier; und/oder
• - das Verpacken umfasst das Einwickeln, Einpacken, Einschlagen, Unterlegen, Zwischenlegen und/oder Trennen; und/oder
• - das Produkt ausgewählt ist aus der Gruppe bestehend aus
• - Elektrogeräte, vorzugsweise Rundfunk- und Fernsehgeräte, Computer, Computerzubehör und mobile Endgeräte;
• - digitale und Printmedien;
• - optische Geräte, vorzugsweise Film- und Fotoaufzeichnungsgeräte;
• - pharmazeutische Produkte, vorzugsweise Arzneimittel, Heilkräuter, Kräutermischungen, Kräutertees und pharmazeutische Trockenextrakte;
• - Lebensmittel, vorzugsweise ausgewählt aus der Gruppe bestehend aus Süßwaren, Backwaren, Rohmassen, gebratene Waren, frittierte Waren, Snackwaren, Sandwiches, Brot, Burger, Fisch, Meeresfrüchte, Fleischwaren, Wurstwaren und Käse; und
• - Nahrungs- und Genussmittel, vorzugsweise umfassend
• - unbehandelte Nahrungsmittel;
• - küchenfertige Nahrungsmittel;
• - garfertige Nahrungsmittel;
• - misch- und/oder aufbereitungsfertige Nahrungsmittel;
• - zubereitungsfertige Nahrungsmittel;
• - verzehrfertige Nahrungsmittel und
• - konservierte Nahrungsmittel.

The present invention further relates to the use of an above-specified metallized barrier paper according to the invention (or a preferred metallized barrier paper according to the invention described in this text) or an above-specified article according to the invention, as packaging material and / or for packaging a product, preferably

• the packaging material is selected from the group consisting of packaging paper, wrapping paper, wrapping paper, bags, bags, sachets, backing paper, interleaving paper and release paper; and or
• - The packaging includes wrapping, wrapping, wrapping, laying under, interposing and / or separating; and or
• - the product is selected from the group consisting of
• - Electrical appliances, preferably radio and television sets, computers, computer accessories and mobile devices;
• - digital and print media;
• - optical equipment, preferably film and photo recorders;
• - pharmaceutical products, preferably pharmaceuticals, medicinal herbs, herbal mixtures, herbal teas and pharmaceutical dry extracts;
• - Food, preferably selected from the group consisting of confectionery, baked goods, raw materials, fried goods, deep-fried goods, snack goods, sandwiches, bread, burgers, fish, seafood, meat products, sausage products and cheese; and
• - Food and luxury goods, preferably comprehensive
• - untreated food;
• - ready-to-cook foods;
• - ready-to-cook foods;
• - Mixable and / or ready-to-use foods;
• - ready-to-prepare foods;
• - ready-to-eat foods and
• - canned foods.

With regard to preferred configurations and possible combinations of preferred configurations of the use according to the invention of a metallized barrier paper according to the invention, the following apply to the metallized barrier paper according to the invention, for the article according to the invention, for the Process according to the invention for producing a metallized barrier paper and / or for the use according to the invention of a metal layer in accordance with the explanations given above (if appropriate, in analogy) and vice versa.

• 1: 1 zeigt schematisch den Schichtaufbau eines erfindungsgemäßen metallisierten Barrierepapieres (1), das als Trägerpapier (10) einen Kurzfaser-Zellstoff mit einem Schopper-Riegler-Grad von mindestens 30°SR und einen Langfaser-Zellstoff mit einem Schopper-Riegler-Grad von mindestens 25°SR aufweist, wobei das Trägerpapier mindestens einen Massenanteil von 50 % Kurzfaser-Zellstoff umfasst, bezogen auf die Gesamtmasse aus Kurzfaser-Zellstoff und Langfaser-Zellstoff; wobei das Trägerpapier bei einem Druck (angegeben als sog. Linienlast in kN/m) von mindestens 40 kN/m und einer Temperatur von mindestens 25 °C kalandriert wurde; und wobei das Trägerpapier auf beiden Seiten vollflächig mit Stärke imprägniert ist (Stärkeimprägnierung hier nicht eigens gezeigt); einer auf der Rückseite des Trägerpapieres angeordneten Barriereschicht (20), umfassend eine Kombination von Sojaölwachs und einem polymeren Bindemittel, welches ein oder mehrere Styrol-Acrylat-(Co-) Polymere umfasst, und einer Aluminiumschicht einer Dicke von 20 nm als Metallschicht (30), welche auf der Barriereschicht (20) angeordnet ist.
• 2: 2 zeigt schematisch den Schichtaufbau eines erfindungsgemäßen metallisierten Barrierepapieres (1), das besteht aus einem oberflächenpräparierten Streichrohpapier als Trägerpapier (10), einer auf der Rückseite des Trägerpapieres angeordneten Barriereschicht (20) umfassend plättchenförmiges Böhmit (anorganisches Pigment) und ein Copolymer, welches hergestellt ist unter Verwendung von Acrylsäurebutylester, Acrylnitril und Styrol als Monomeren, einer auf der Rückseite der Barriereschicht angeordneten Klebeschicht (40), umfassend einen ausgehärteten Polyurethan-Klebstoff, und einer auf der Klebeschicht angeordneten Aluminiumschicht einer Dicke von 20 nm als Metallschicht (30).
• 3: 3 zeigt schematisch den Schichtaufbau eines erfindungsgemäßen metallisierten Barrierepapieres (1), das besteht aus einem oberflächenpräparierten Streichrohpapier als Trägerpapier (10), einer auf der Rückseite des Trägerpapieres angeordneten Barriereschicht (20), umfassend eine Kombination von Sojaölwachs und einem polymeren Bindemittel welches ein oder mehrere Styrol-Acrylat-(Co-) Polymere umfasst, und einer auf der Vorderseite des Trägerpapieres angeordneten Aluminiumschicht einer Dicke von 20 nm als Metallschicht (30).
• 4: 4 zeigt schematisch den Schichtaufbau eines erfindungsgemäßen metallisierten Barrierepapieres (1), das besteht aus einem oberflächenpräparierten Streichrohpapier als Trägerpapier (10), einer auf der Rückseite des Trägerpapieres angeordneten ersten Barriereschicht (21), umfassend plättchenförmiges Böhmit (anorganisches Pigment) und ein Copolymer (als polymeres Bindemittel), welches hergestellt ist unter Verwendung von Acrylsäurebutylester, Acrylnitril und Styrol als Monomeren, einer auf der ersten Barriereschicht angeordneten zweiten Barriereschicht (22), umfassend (als polymeres Bindemittel) ein Acrylat-Copolymer, das aus Acrylsäuremethylester, Methacrylsäuremethylester, Acrylsäurebutylester, Methacrylsäurebutylester, Acrylsäure-2-ethylhexylester, Methacrylsäure-2-ethylhexylester und/oder Styrol hergestellt wurde, und ein synthetisches Wachs umfassend Octacosan, und einer auf der zweiten Barriereschicht angeordneten Aluminiumschicht einer Dicke von 20 nm als Metallschicht (30).

The invention is described in more detail below by means of examples and figures ("Fig."):

• 1 : 1 shows schematically the layer structure of a metallized barrier paper according to the invention ( 1 ), used as backing paper ( 10 ) has a short fiber pulp with a Schopper-Riegler degree of at least 30 ° SR and a long fiber pulp with a Schopper-Riegler degree of at least 25 ° SR, the carrier paper comprising at least a mass fraction of 50% short fiber pulp, based on the total mass of short fiber pulp and long fiber pulp; wherein the carrier paper was calendered at a pressure (indicated as so-called line load in kN / m) of at least 40 kN / m and a temperature of at least 25 ° C; and the backing paper is completely impregnated with starch on both sides (starch impregnation not specifically shown here); a barrier layer on the back of the backing paper ( 20th ), comprising a combination of soybean oil wax and a polymeric binder, which comprises one or more styrene-acrylate (co) polymers, and an aluminum layer with a thickness of 20 nm as a metal layer ( 30th ), which on the barrier layer ( 20th ) is arranged.
• 2 : 2 shows schematically the layer structure of a metallized barrier paper according to the invention ( 1 ), which consists of a surface-prepared coating base paper as a carrier paper ( 10 ), a barrier layer arranged on the back of the carrier paper ( 20th ) comprising flaky boehmite (inorganic pigment) and a copolymer which is produced using butyl acrylate, acrylonitrile and styrene as monomers, an adhesive layer arranged on the back of the barrier layer ( 40 ), comprising a cured polyurethane adhesive and an aluminum layer with a thickness of 20 nm arranged on the adhesive layer as a metal layer ( 30th ).
• 3 : 3 shows schematically the layer structure of a metallized barrier paper according to the invention ( 1 ), which consists of a surface-prepared coating base paper as a carrier paper ( 10 ), a barrier layer arranged on the back of the carrier paper ( 20th ), comprising a combination of soybean oil wax and a polymeric binder which comprises one or more styrene-acrylate (co) polymers, and an aluminum layer with a thickness of 20 nm as a metal layer arranged on the front side of the carrier paper ( 30th ).
• 4th : 4th shows schematically the layer structure of a metallized barrier paper according to the invention ( 1 ), which consists of a surface-prepared coating base paper as a carrier paper ( 10 ), a first barrier layer arranged on the back of the carrier paper ( 21st ), comprising flaky boehmite (inorganic pigment) and a copolymer (as a polymeric binder) which is produced using butyl acrylate, acrylonitrile and styrene as monomers, a second barrier layer arranged on the first barrier layer ( 22nd ), comprising (as a polymeric binder) an acrylate copolymer made from methyl acrylate, methyl methacrylate, butyl acrylate, butyl methacrylate, 2-ethylhexyl acrylate, 2-ethylhexyl methacrylate and / or styrene, and a synthetic wax comprising octacosane, and a on the second barrier layer arranged aluminum layer with a thickness of 20 nm as a metal layer ( 30th ).

Examples:

The following examples are intended to further explain and illustrate the invention without restricting its scope of protection:

Example 1: Production of a barrier paper

A carrier paper was used which was produced from a 1: 1 mixture of short fiber and long fiber pulp with a grind of 39 ° SR on a paper machine, a paper web provided with resin sizing in the mass and having a mass per unit area of 40 g / m ² . The paper substrate produced was calendered at a line load of 80 kN / m and a temperature of 80 ° C.

Using an air brush, a first barrier screed, which was in the form of an aqueous dispersion, was applied to the produced carrier paper and this barrier screed was then dried using infrared (IR) and air drying, so that a first barrier layer with a basis weight of 3 g / m ² resulted . The composition of the first barrier screed (without taking water into account) is given in Table 1.

Using a volumetric squeegee, a second barrier screed, which was in the form of an aqueous dispersion, was applied to the first barrier layer produced and this barrier screed was then dried using IR and air drying, so that a second barrier layer with a basis weight of 4 g / m ² resulted. The composition of the second barrier screed (without taking water into account) is also given in Table 1. Table 1: Composition of barrier screeds component Trade name component Mass fraction First barrier screed (plus water): Polyacrylamide, anionically modified Sterocoll BL binder 0.01 to 0.10 aqueous polymer dispersion based on acrylic acid esters, carboxylic acids Sterocoll FS binder 1.0 to 2.5 component Trade name component Mass fraction anionic copolymer based on n-butyl acrylate, acrylonitrile and styrene Acronal S505 binder 65 to 75 kaolin Capim NP pigment 25 to 35 Second barrier screed (plus water): Random acrylate copolymer produced from methyl acrylate, butyl acrylate, 2-ethylhexyl acrylate and styrene as monomers in equal proportions by weight. Acrylate copolymer Barrier means 70% Octacosane Octacosane wax 30%

The resulting barrier paper, which could be heat-sealed at 120 ° C., had a basis weight of 47 g / m ² and was measured for its properties. The results of these measurements are summarized in Table 2 below. Table 2: Properties of the barrier paper produced property value unit Determination method Basis weight 47 ± 2 g / m ² DIN ISO 536 thickness 63 ± 5 µm DIN EN 20534 Breaking load lengthways 55 ± 5 N / 15 mm EN ISO 1924-2 Breaking load across 20 ± 4 N / 15 mm EN ISO 1924-2 Tear length lengthways 10 ± 2 km according to Hoyer Tear length across 3.5 ± 1 km according to Hoyer Burst strength 170 ± 20 kPa EN ISO 2758 Fat resistance palm kernel fat top 1 level DIN 53116 Fat resistance turpentine top + 1800 s Tappi 454 Water resistance top > 600 s Tappi 454 Cobb ₃₀₀ water absorption top <1 g / m ² EN ISO 535 KIT test 12th Tappi 559 Seal strength 4.5 - 5 N / 15 mm 500 kPa, 150 ° C and 1 s Water vapor permeability <100 g / (m ^{2 *} d) DIN 53122-1 (23 ° C / 85% r. H.) Bekk smoothness: 150 Seconds ISO 5627

Example 2: Production of a metallized barrier paper according to the invention

A barrier paper produced as in Example 1 was coated on one side with an aluminum layer with a thickness of 20 nm by depositing an aluminum layer according to the physical vapor deposition process on the barrier side, i.e. on the exposed second barrier layer not in contact with another layer of the barrier paper (0.02 µm) vapor-deposited using the PVD method. The layer structure of the resulting metallized barrier paper according to the invention is shown schematically in FIG 4th specified.

The following tests showed the results given in Table 3 below. A barrier paper produced as in Example 1 without a metal layer (not according to the invention) was used as a comparison. Table 3: Heat sealability of barrier papers Barrier paper Heat sealability pressure Upper jaw temperature Lower jaw temperature time Sealing Fiber tear example 1 500 kPa 90 ° C 90 ° C 1s Yes Yes example 1 500 kPa 150 ° C 150 ° C 1s Yes Yes Example 2 500 kPa 150 ° C 150 ° C 1s Yes No Example 2 500 kPa 180 ° C 180 ° C 1s Yes No Example 2 500 kPa 210 ° C 210 ° C 1s Yes No

It can be seen from the values given in Table 3 above that a metallized barrier paper according to the invention has an improved heat sealability compared to a non-metallized comparison paper (not according to the invention) (no fiber tear).

QUOTES INCLUDED IN THE DESCRIPTION

This list of the documents listed by the applicant was generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Patent literature cited

• DE 102014119572 A1 [0003]
• EP 3342929 A1 [0005, 0025]
• WO 2008/014903 A1 [0051]
• WO 2011/110498 A1 [0051]

Non-patent literature cited

• DIN EN ISO 5267-1: 2000-10 [0024]

Claims (13)

Metallized barrier paper (1), at least comprising the following components arranged in layers: S1) a carrier paper (10), having a front side and a rear side opposite the front side, S2) at least one barrier layer (20) arranged on the rear side of the carrier paper (10), comprising at least one barrier material selected from the group consisting of: - polymer binders, - natural waxes, - synthetic waxes, - vegetable oils, - organic pigments, - inorganic pigments, - crosslinked polysaccharides, and - their mixtures and S3) at least one metal layer (30). Metallized barrier paper after Claim 1 , wherein the or at least one of several polymeric binders to be used as the barrier material of the barrier layer is a crosslinked or uncrosslinked polymeric binder and is selected from the group consisting of - polyacrylates, - polymethacrylates, - acrylate copolymers, with their monomers preferably each being selected independently of one another from the group consisting of acrylic acid alkyl ester, methacrylic acid alkyl ester, acrylonitrile, methacrylonitrile, styrene, α-methylstyrene and their mixtures, - polystyrenes, - polybutadienes, and - their mixtures. Metallized barrier paper according to one of the preceding claims, wherein the metallized barrier paper comprises, preferably as component S2): S21) a first barrier layer (21) arranged on the rear side of the carrier paper, preferably consisting of or comprising a polymeric binder and a pigment, and S22) a second barrier layer (22) arranged on the first barrier layer, preferably consisting of or comprising an acrylate copolymer and a natural or synthetic wax. Metallized barrier paper after Claim 3 wherein the second barrier layer comprises a wax and wherein the wax comprises or is a synthetic wax, preferably a wax composed of saturated hydrocarbons, the wax in the second barrier layer particularly preferably containing or consisting of one, two, three or more than three alkanes, selected from the group consisting of heneicosan, docosan, tricosan, tetracosan, pentacosan, hexacosan, heptacosan, octacosan, nonacosan, triacontan, hentriacontan, dotriacontan, tritriacontan, tetratriacontan, pentatriacontan, hexatriacontan and nonatriacontan, heptatriacontan. Metallized barrier paper after Claim 3 or 4th , wherein the acrylate copolymer in the second barrier layer comprises or is a copolymer produced using two, three, four, five, six or all monomers selected from the group consisting of methyl acrylate, methyl methacrylate, butyl acrylate, butyl methacrylate, 2- acrylic acid ethylhexyl ester, 2-ethylhexyl methacrylate and styrene. Metallized barrier paper according to one of the preceding claims, wherein - the barrier paper comprises as an additional, layered component: S4) at least one (each) below the or a metal layer (30) disposed adhesive layer (40), and / or - the layered components of the barrier paper are arranged in the order of layers S1), S2), if available S4), and S3). Metallized barrier paper according to one of the preceding claims, wherein the at least one metal layer (30), preferably the one metal layer (30), on the back of the at least one barrier layer (20), or, if the metallized barrier paper comprises two or more barrier layers, on the The back of the second or on the back of the outermost barrier layer, preferably over the entire surface, is arranged, Metallized barrier paper according to one of the preceding claims, wherein the at least one metal layer: - is selected from the group consisting of - aluminum layer, - copper layer, - silver layer, - gold layer, - Metal alloy layer, preferably bronze layer and - their combinations and preferably comprises or is an aluminum layer, and or - Has a layer thickness in the range from 0.5 to 250 nm, preferably from 1 to 200 nm, particularly preferably from 5 to 100 nm. Metallized barrier paper according to one of the preceding claims, at least comprising the following components arranged in layers: S1) a carrier paper (10), having a front side and a rear side opposite the front side, S21) a first barrier layer (21) arranged on the back of the carrier paper, preferably consisting of or comprising a polymeric binder and a pigment, S22) a second barrier layer (22) arranged on the first barrier layer, preferably consisting of or comprising an acrylate copolymer and a wax, S3) a metal layer (30) arranged on the back of the second barrier layer (22), preferably over the entire surface. and preferably S4) an adhesive layer (40) arranged below the metal layer (30), between the metal layer (30) and the rear side of the second barrier layer (20). Article, comprising or consisting of a metallized barrier paper according to one of Claims 1 to 9 , wherein the article is preferably selected from the group consisting of packaging paper, wrapping paper, wrapping paper, bags, bags, sachets, backing paper, interleaving paper and release paper. A method for producing a metallized barrier paper, preferably a metallized barrier paper according to one of the Claims 1 to 9 , comprising the following steps: V1) producing or providing a barrier paper, comprising - a backing paper (10) having a front side and a back side opposite the front side and - at least one barrier layer (20) arranged on the back of the backing paper, comprising at least one barrier material , selected from the group consisting of: - polymeric binders, - natural waxes, - synthetic waxes, - vegetable oils, - preferably organic pigments, - inorganic pigments, - crosslinked polysaccharides, and - mixtures thereof, and V2a) producing or providing a multilayer composite of a metal layer (30), a separating layer and a carrier layer, V3a) coating with an adhesive (40): - the front side of the carrier paper (10) of the barrier paper and / or - the rear side of the at least one barrier layer (20), or, if the barrier paper produced or provided has two or more barrier layers ten, the back of the second or the back of the outermost barrier layer, and / or - the metal layer (30) of the multilayer composite, V4a) lamination of the multilayer composite, optionally coated with the adhesive (40), on: the front side of the carrier paper (10) of the barrier paper, optionally coated with the adhesive (40), so that the adhesive (40) is arranged between the front side of the carrier paper (10) and the metal layer (30), and / or - the back of the at least one barrier layer (20), possibly coated with the adhesive (40), or, if the barrier paper produced or provided comprises two or more barrier layers, on the back of the second or on the back of the respective outermost barrier layer, V5a ) partial or complete drying or hardening of the adhesive (40) so that at least one adhesive layer (40) results, V6a) removal of the carrier layer and the separating layer so that only the metal layer (30) remains on the adhesive layer (40) and V7a ) preferably corona treatment of the metal layer (30), so that a metallized barrier paper results; or V2b) preferably coating with an adhesive (40): - the front side of the carrier paper (10) of the barrier paper and / or - the rear side of the at least one barrier layer (20), or, if the barrier paper produced or provided comprises two or more barrier layers, the back of the second or the back of the respective outermost barrier layer, and preferably partial or complete drying or curing of the adhesive (40) so that at least one adhesive layer (40) results, V3b) coating with a metal layer (30) by physical vapor deposition - the back of the at least one barrier layer (20), or, if the barrier paper produced or provided comprises two or more barrier layers, the back of the second or outermost barrier layer, or, if in step V3b), an adhesive layer (40) a barrier layer results, - the on the back of the at least one B arrier layer (20), or, if the barrier paper produced or provided comprises two or more barrier layers, the adhesive layer (40) arranged on the back of the second or outermost barrier layer, and / or the front of the carrier paper (10) of the Barrier paper or, if in step V3b) an adhesive layer (40) results on a barrier layer, - the adhesive layer (40) arranged on the front side of the carrier paper (10), so that a metallized barrier paper results. Use of a metal layer - to reduce the water vapor permeability, and / or - To increase the temperature-insulating properties, and / or - To improve the heat sealability of a barrier paper, which comprises at least the following components: S1) a backing paper (10), having a front side and a rear side opposite the front side, and S2) at least one barrier layer (20) arranged on the rear side of the carrier paper, comprising at least one barrier material selected from the group consisting of: - polymer binders, - natural waxes, - synthetic waxes, - vegetable oils, - preferably organic pigments, - inorganic pigments, - crosslinked polysaccharides, and - their mixtures. Use of a metallized barrier paper according to one of the Claims 1 to 9 or an article Claim 10 , as packaging material and / or for packaging a product, wherein preferably - the packaging material is selected from the group consisting of packaging paper, wrapping paper, wrapping paper, bags, bags, sachets, backing paper, interleaving paper and release paper; and / or the packaging comprises wrapping, wrapping, wrapping, laying under, interposing and / or separating; and / or - the product is selected from the group consisting of - electrical appliances, preferably radio and television sets, computers, computer accessories and mobile devices; - digital and print media; - optical devices, preferably film and photo recording devices - pharmaceutical products, preferably medicinal products, medicinal herbs, herbal mixtures, herbal teas and pharmaceutical dry extracts - food, preferably selected from the group consisting of confectionery, baked goods, raw materials, fried goods, deep-fried goods, snack goods, sandwiches, bread, burgers, fish, seafood, meat products, Charcuterie and cheese; and - food and luxury goods, preferably comprising - untreated food; - ready-to-cook foods; - ready-to-cook foods; - Mixable and / or ready-to-use foods; - ready-to-prepare foods; - ready-to-eat foods; and - canned foods.

Images