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EP3795746A1 - Papier barrière imprimable et scellable à chaud - Google Patents

Papier barrière imprimable et scellable à chaud Download PDF

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Publication number
EP3795746A1
EP3795746A1 EP20197872.3A EP20197872A EP3795746A1 EP 3795746 A1 EP3795746 A1 EP 3795746A1 EP 20197872 A EP20197872 A EP 20197872A EP 3795746 A1 EP3795746 A1 EP 3795746A1
Authority
EP
European Patent Office
Prior art keywords
barrier
carrier substrate
starch
layer
coating composition
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP20197872.3A
Other languages
German (de)
English (en)
Inventor
Nora Wilke
Lena-Maria Grundl
Dieter Becker
Christoph Hahn
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Mitsubishi HiTec Paper Europe GmbH
Original Assignee
Mitsubishi HiTec Paper Europe GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Mitsubishi HiTec Paper Europe GmbH filed Critical Mitsubishi HiTec Paper Europe GmbH
Publication of EP3795746A1 publication Critical patent/EP3795746A1/fr
Withdrawn legal-status Critical Current

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Classifications

    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H19/00—Coated paper; Coating material
    • D21H19/10—Coatings without pigments
    • D21H19/14—Coatings without pigments applied in a form other than the aqueous solution defined in group D21H19/12
    • D21H19/18—Coatings without pigments applied in a form other than the aqueous solution defined in group D21H19/12 comprising waxes
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H19/00—Coated paper; Coating material
    • D21H19/10—Coatings without pigments
    • D21H19/14—Coatings without pigments applied in a form other than the aqueous solution defined in group D21H19/12
    • D21H19/20—Coatings without pigments applied in a form other than the aqueous solution defined in group D21H19/12 comprising macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H19/00—Coated paper; Coating material
    • D21H19/10—Coatings without pigments
    • D21H19/14—Coatings without pigments applied in a form other than the aqueous solution defined in group D21H19/12
    • D21H19/34—Coatings without pigments applied in a form other than the aqueous solution defined in group D21H19/12 comprising cellulose or derivatives thereof
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H19/00—Coated paper; Coating material
    • D21H19/80—Paper comprising more than one coating
    • D21H19/82—Paper comprising more than one coating superposed
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H19/00—Coated paper; Coating material
    • D21H19/80—Paper comprising more than one coating
    • D21H19/82—Paper comprising more than one coating superposed
    • D21H19/824—Paper comprising more than one coating superposed two superposed coatings, both being non-pigmented
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H19/00—Coated paper; Coating material
    • D21H19/80—Paper comprising more than one coating
    • D21H19/84—Paper comprising more than one coating on both sides of the substrate
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H27/00—Special paper not otherwise provided for, e.g. made by multi-step processes
    • D21H27/10—Packing paper

Definitions

  • the present invention relates to a heat-sealable barrier paper comprising or consisting of a) a carrier substrate, consisting of or comprising I) cellulose fibers and II) starch and / or carboxymethyl cellulose, the carrier substrate having a front side and a rear side opposite the front side, b) optionally one
  • the intermediate layer arranged on the front side of the carrier substrate, comprising a binding agent, c) one on the front side of the carrier substrate or, if there is an intermediate layer, a first barrier layer arranged on the intermediate layer, comprising a crosslinked polysaccharide, d) a second barrier layer arranged on the first barrier layer, consisting of or comprising i) an acrylate copolymer and / or ii) a wax based on a vegetable oil and / or iii) a wax based on saturated hydrocarbons and e) optionally a printable layer arranged on the back of the carrier substrate, consisting of or comprising a pigment and a binder
  • Food that is sold in bulk such as sausage, cheese or baked goods, is usually handed over to customers in packaging for reasons of hygiene or freshness. Height There are particular requirements for the packaging in the case of fatty foods.
  • fat from the food can penetrate the packaging material in the case of fatty foods. This can cause the packaging material to soften and tear or the grease to contaminate other objects if you come into contact with the packaging.
  • the packaging paper for food with a basis weight of between 20 g / m 2 and 40 g / m 2 , and with a mass fraction of filler that is less than 20% based on the mass of the uncoated paper.
  • the packaging paper has a coating on at least one side which comprises a vegetable oil encapsulated in a polymer, talc and a binder.
  • a heat-sealable barrier paper which comprises a carrier substrate, a first barrier layer comprising a crosslinked polysaccharide and a second barrier layer comprising i) an acrylate copolymer and / or ii) a wax based on a vegetable oil.
  • the use of paper, cardboard or cardboard is specified as the carrier substrate, with no further configuration of the carrier substrate being described.
  • WO 2013/164 646 A1 describes a coated material that comprises a substrate and at least two barrier layers arranged on the substrate, one barrier layer can be arranged on each side of the substrate.
  • the packaging material consists of a paper substrate made from recycled paper fibers and a printable layer which is arranged on the paper substrate.
  • the packaging material also includes a moisture barrier disposed on the printable layer.
  • the printable layer can also comprise crosslinked starch.
  • WO 2013/066246 A1 describes a film or a coating with which it is possible to prevent the migration of substances from a paper or cardboard with recycled fibers.
  • the film or the coating comprises hemicellulose.
  • another layer can be applied which contains a thermoplastic polymer or a wax.
  • a wood-free, fat-tight "sandwich paper” is often used for packaging fatty foodstuffs, which has a certain fat resistance due to the greasy grinding of the fibrous materials. Often, however, the fat resistance of these greaseproof papers is not sufficient.
  • a greasy grinding is achieved with wide, widely spaced knives or a basalt stone dimensioning with a long grinding time.
  • the fibers are not cut, but squeezed.
  • the result is a strongly swelling fiber slime, a slippery, smeary substance that drains only slowly on the paper machine.
  • the paper gains a high density, but loses its opacity. It becomes glassy and translucent.
  • the fiber is shortened slightly, the term "greasy-long" is used. Fibers that are shortened to a greater extent are referred to as "greasy short". If the substrate is mainly made of greasy, short fibers, it has only a low resistance to tearing and tear propagation.
  • a composite packaging material is often used as a more fat-resistant alternative to greaseproof paper.
  • a composite packaging material can consist, for example, of a composite material formed from a paper and a plastic and / or aluminum foil. If there is no polyethylene (PE) coating, fluorocarbons can be used as water-repellent chemicals. For example, paper is coated on one side with polyethylene, often in an energy-intensive extrusion process, or an aluminum foil. These composite packaging materials are characterized by their high resistance to fat and moisture. By selecting the appropriate polyethylene, it is also possible to produce composite packaging materials that are suitable for storing frozen foods. However, if these composite packaging materials are sent for paper recycling, these materials disrupt the recycling process considerably.
  • PE polyethylene
  • the composite packaging materials cannot be defibrated sufficiently well during the recycling process and so-called wet-strength specks are formed.
  • Specks are remnants of the Plastic or aluminum foil to which paper fibers are still attached. The necessary separation of the specks in the pulp preparation process results in a not inconsiderable loss of pulp, which is withdrawn from the process. These specks have to be laboriously removed during the recycling process. It is also not possible to compost these composites because the plastic or aluminum foils used are not biodegraded.
  • Fossil raw materials are understood as meaning gaseous, liquid and solid fuels made up of organic substances through a conversion of biomass that has been ongoing since the Mesozoic era. They consist mainly of carbon and hydrogen, but also contain oxygen, nitrogen and sulfur as well as mineral additions. The most important fossil raw materials are coal, oil and natural gas.
  • Renewable raw materials are among the renewable resources. This is understood to mean substances that come from living matter and are specifically used by humans for purposes outside of the food and feed area.
  • the barrier paper is heat-sealable, i.e. it can be bonded to surfaces under the action of heat and, if necessary, pressure.
  • packaging bags made from the barrier paper can be sealed after being filled with the product to be packaged, whereby the product is sealed until the packaging is opened.
  • barrier papers on the market that are manufactured entirely or predominantly from renewable raw materials and therefore have good recyclability and / or biodegradability, the problem arises that the barrier papers do not have a heat seal have sufficient structural strength or splitting strength. This has the result that the barrier paper can tear open within the barrier paper and, as a result, sealing of the food packaged by heat sealing can no longer be ensured. It has been shown that the tearing within the barrier paper can take place along the boundary layers of different layers of the barrier paper or even within a layer of the barrier paper.
  • the object of the present invention is to provide a packaging material which has an increased quality strength and / or resistance to splitting and thereby prevents tearing within the barrier paper or occurs only when there are higher tensile forces.
  • the barrier paper should have a low gas permeability, in particular for water vapor and / or oxygen.
  • Another object of the present invention is to design the packaging material in such a way that it is suitable for contact with food and has a high resistance and barrier effect against fats and / or oils and / or water or water vapor.
  • Another object of the present invention is to design the packaging material in such a way that it can be produced entirely or predominantly from renewable raw materials.
  • An additional object of the present invention is to design the barrier paper in such a way that it is designed to be heat-sealable. In addition, it is desirable if the barrier paper recycles and / or biodegrades well; H. can be composted.
  • the barrier paper should preferably be designed in such a way that it can be printed on.
  • the structural strength and splitting strength of the barrier paper according to the invention can be improved (in comparison with a paper that does not contain starch and / or carboxymethyl cellulose in the carrier substrate).
  • the carrier substrate not only improves the quality strength within the carrier substrate, but surprisingly also the bond between the carrier substrate and the adjacent layers, so that an increased quality strength of the entire barrier paper results.
  • Cellulose fibers are the fibrous mass that is created during the chemical decomposition of plant fibers and which consists primarily of cellulose.
  • the term cellulose fibers includes both fresh fibers (also called primary fibers), which are obtained directly from plants, and waste paper fibers (also called secondary fibers or recycling fibers), which are obtained from recycled paper or cardboard.
  • Barrier papers are preferred according to the invention, the mass fraction of waste paper fibers in the carrier substrate being more than 1%, preferably more than 20%, particularly preferably more than 50%, based on the total mass of the cellulose fibers in the carrier substrate.
  • the mass fraction of cellulose fibers in the carrier substrate being 50 to 98%, preferably 60 to 90%, particularly preferably 70 to 89%, based on the total mass of the carrier substrate.
  • the mass fraction of starch and carboxymethyl cellulose in the carrier substrate being 2 to 50%, preferably 10 to 40%, particularly preferably 11 to 30%, based on the total mass of the carrier substrate. It goes without saying that if starch or carboxymethyl cellulose is not contained in the carrier substrate, the “mass fraction of starch and carboxymethyl cellulose” corresponds to the mass fraction of the components present, since the non-existent component has a mass fraction of 0%.
  • the mass fraction of carboxymethyl cellulose in the carrier substrate is 2 to 50%, preferably 10 to 40%, particularly preferably 11 to 30%, based on the total mass of the carrier substrate, and if the carrier substrate is not carboxymethyl cellulose comprises, the mass fraction of starch in the carrier substrate is 2 to 50%, preferably 10 to 40%, particularly preferably 11 to 30%, based on the total mass of the carrier substrate.
  • barrier papers are preferred, the carrier substrate comprising starch and the starch in the carrier substrate being potato starch, corn starch, rice starch, pea starch, tuber starch, corn starch or mixtures thereof, particularly preferably the starch in the carrier substrate being potato starch.
  • the carrier substrate is paper, cardboard or cardboard.
  • paper, cardboard and paperboard and flat materials are concerned which can be produced from the same basic materials and in principle the same production methods.
  • barrier paper Regardless of whether paper, cardboard or paperboard is used as the carrier substrate, the resulting product according to the invention is referred to in the context of the present invention as barrier paper, without this being intended to restrict the weight per square meter.
  • barrier paper thus also includes the terms barrier cardboard and barrier cardboard, unless the weight per square meter is specified.
  • a barrier paper according to the invention is preferred, all or at least some of the cellulose fibers having a Schopper-Riegler grade 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 .
  • a barrier paper according to the invention is preferred, the cellulose fibers comprising a short fiber cellulose and a long fiber cellulose.
  • the barrier paper according to the invention is a barrier paper, the short-fiber cellulose completely or partially, preferably at least in a mass fraction of more than 50%, based on the total mass of the short-fiber cellulose, consisting of fibers of hardwood, preferably consists of birch fibers, beech fibers or eucalyptus fibers and the long fiber cellulose wholly or partially, preferably at least more than 50%, based on the total mass of the long fiber cellulose, consists of fibers of coniferous wood, preferably pine fibers, There are spruce fibers or fir fibers.
  • the carrier substrate is made from a mixture of short-fiber cellulose and long-fiber cellulose and this mixture is leveled again before the carrier substrate is made to produce the desired Schopper -Riegler degrees 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.
  • the short-fiber and long-fiber pulps used before grinding can have a Schopper-Riegler degree that lies outside the preferred range and the Schopper-Riegler degree of the short-fiber pulps and long-fiber pulps used are preferably smaller before grinding, than after grinding.
  • first barrier layer comprising a crosslinked polysaccharide
  • second barrier layer consisting of or comprising an acrylate copolymer, a wax based on a vegetable oil, a wax based on saturated hydrocarbons or a Mixture of a) acrylate copolymer and a wax based on a vegetable oil or b) acrylate copolymer and a wax based on saturated hydrocarbons or c) of acrylate copolymer and a wax based on a vegetable oil and a wax based on saturated hydrocarbons , have a particularly low gas permeability, in particular to water vapor and oxygen, and also have a particularly good barrier effect against fats, oils and water.
  • our own studies have shown that the combination of the first and second barrier layers has a synergistic barrier effect that is not only due to the presence of two layers or the resulting thickness of both layers.
  • barrier papers according to the invention it is possible to completely dispense with the use of extruded films or vapor-deposited or glued-on metal foils, since the individual layers of the barrier paper according to the invention can be produced by applying dispersions. The individual layers of the barrier paper according to the invention are not extruded.
  • a wax based on a vegetable oil is understood to mean a wax that is obtained by chemical modification of a vegetable oil.
  • the chemical modification can, for example, be a partial or complete hydrogenation with a metallic catalyst, for example nickel, and hydrogen, all or some of the double bonds in the oil being hydrogenated to form single bonds.
  • the waxes are solid at 20 ° C and not liquid. The chemical modification of the vegetable oil thus causes an increase in the melting point.
  • a vegetable oil is understood to mean a fatty acid triglyceride which is obtained from plants or parts of plants.
  • the oil is usually obtained by pressing, extracting or refining the 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 referred to as 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).
  • non-drying e.g. olive oil
  • semi-drying e.g. soy or rapeseed oil
  • drying oils e.g. linseed or poppy seed oil.
  • drying does not mean evaporation, but the solidification of the oil caused by the oxidation and polymerization of the unsaturated fatty acids.
  • semi-drying and drying oils as starting materials for producing the waxes used according to the invention is preferred.
  • Possible sources of vegetable oil are aça ⁇ 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 cottonseed plant), borage oil or borage seed oil (from the seeds of the borage plant ), Cupuaçu 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 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
  • poppy seed oil from the seeds of the poppy seeds
  • evening primrose oil olive oil (from the pulp and the 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 from the seeds of the perilla plant (Shiso, p esamblatt), 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 sea buckthorn berries, the fruit of the sea buckthorn bush), sea buckthorn kernel oil (from the kernels of the sea buckthorn berries, the Fruit of the sea buckthorn bush), mustard oil (from the seeds of the black mustard), black cumin
  • a barrier paper is preferred, the wax based on a vegetable oil being a wax based on an oil 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, preferably if the wax based on a vegetable oil is a wax based on a soybean oil, i. H. around soybean oil wax or soy wax.
  • the waxes made from these oils are characterized by high resistance and can be made with high melting points.
  • the ones used according to the invention Waxes, namely 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, show a significant increase in the resistance to fats and / or oils and / or moisture when used in barrier papers according to the invention.
  • the use of soybean oil wax is particularly preferred according to the invention.
  • 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 tasteless and odorless.
  • Barrier papers in which the wax has a melting point above 40.degree. C., preferably above 50.degree. C., particularly preferably above 60.degree. C., are preferred according to the invention.
  • Barrier papers are preferred according to the invention, the mass fraction of wax in the second barrier layer being 6 to 98%, preferably 20 to 90%, particularly preferably 50 to 89%, based on the total mass of the barrier layer.
  • the polymeric binder which can be present in the second barrier layer in addition to the wax, is a crosslinked or uncrosslinked binder selected from the group consisting of starch and polyvinyl alcohol , carboxyl group-modified polyvinyl alcohol, ethylene-vinyl alcohol copolymer, a combination of polyvinyl alcohol and ethylene-vinyl alcohol copolymer, ethylene-vinyl acetate copolymer, silanol group-modified polyvinyl alcohol, diacetone-modified polyvinyl alcohol, modified polyethylene glycol, unmodified polyethylene glycol -Poly (oxy-1,2-ethanediyl), styrene-acrylate polymers, acrylic copolymers and mixtures thereof.
  • a crosslinked or uncrosslinked binder selected from the group consisting of starch and polyvinyl alcohol , carboxyl group-modified polyvinyl alcohol, ethylene-vinyl alcohol copolymer, a combination of polyvinyl alcohol and ethylene-
  • the second barrier layer consists of or comprises the second barrier layer an acrylate copolymer and a wax based on a vegetable oil.
  • barrier papers according to the invention have a particularly high resistance to grease, oil and moisture if the polymeric binder, which can be present in the second barrier layer in addition to the wax, is one or more styrene-acrylate polymers or the binder comprises these.
  • waxes based on a vegetable oil and here in particular wax based on soybean oil, interact particularly well with acrylate copolymers.
  • improved properties of the barrier layer can be obtained which cannot be obtained by combining an acrylate copolymer with other waxes.
  • the waxes based on a vegetable oil can interact with the acrylate copolymer due to the high content of unsaturated fatty acids and the resulting high density of double bonds. Further waxes can be added, but very good barrier layers are obtained if acrylate copomers and waxes based on a vegetable oil are used in the barrier layer.
  • the mass fraction of the polymeric binder which is present in the second barrier layer in addition to the wax is 94 to 2% in the second barrier layer, preferably 80 to 10%, particularly preferably 50 to 11%, based on the total mass of the second barrier layer.
  • the mass fraction of the polymeric binder in the second barrier layer is 94 to 2% and the mass fraction of the wax in the second barrier layer is 6 to 98% and it is even more preferred if the mass fraction of the polymeric binder in the second barrier layer is 80 to 10% and the mass fraction of the wax in the second barrier layer is 80 to 90% and it is even more preferred if the mass fraction of the polymeric binder in the barrier layer is 50 to 11% and the mass fraction of the wax in of the second barrier layer is 50 to 89%.
  • the polymeric binder which can be present in the second barrier layer in addition to the wax, consists of two or more binders and at least one binder is an anionic binder.
  • 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).
  • the glass transition temperature of the anionic binder is less than or equal to 120.degree.
  • DSC dynamic differential calorimetry
  • the anionic binder which is present in the second barrier layer in addition to the wax is a copolymer.
  • Suitable anionic binders that are present in the second barrier layer in addition to the wax are, for example, partially or completely deprotonated polyacrylic acid (or copolymers thereof, for example with acrylic acid esters), partially or completely deprotonated polymethacrylic acid (or copolymers thereof, for example with methacrylic acid esters), copolymers of polyacrylic acid esters ( preferably methyl or ethyl esters), copolymers of polymethacrylic acid esters (preferably methyl or ethyl esters) or polyacrylamides or copolymers thereof.
  • an aqueous solution or dispersion of the anionic binder which is present in addition to the wax in the second barrier layer, has a basic pH, provided that it is dissolved or dispersed in water with a mass fraction of 10%, preferably in the range from 8 to 10%.
  • an aqueous solution or dispersion of the anionic binder can be prepared which has a mass fraction of 10% and the pH value can be determined using conventional means.
  • a polymeric binder is understood to mean a binder that has been built up from a large number of molecules by chemical reaction (in particular polycondensation) and in which one or more types of atoms or atom groupings (so-called repeating units) repeats are strung together and the number of repeating units per molecule is more than 25.
  • the binder in the intermediate layer is preferably a binder selected from the group comprising starch, styrene-butadiene latex, polyvinyl alcohol, carboxyl group-modified polyvinyl alcohol, ethylene-vinyl alcohol copolymer, silanol group-modified polyvinyl alcohol, acetoacetyl-modified polyvinyl alcohol, diacetone-modified polyvinyl alcohol, acrylate -Copolymer and film-forming acrylic copolymer.
  • the binder in the intermediate layer is a synthetic polymer based on acrylic acid ester (preferably acrylic acid methyl ester or acrylic acid ethyl ester), styrene and acrylonitrile.
  • the second barrier layer comprises one or more polymers selected from the group consisting of acrylic acid-acrylamide copolymer (poly (acrylic acid- co- acrylamide), acrylic acid-acrylic acid ester-acrylonitrile copolymer, acrylic acid ethyl ester-carboxylic acid copolymer, Ethyl acrylate-acrylic acid copolymer, ethyl acrylate-carboxylic acid copolymer, ethyl acrylate-acrylic acid copolymer, polymethyl methacrylate and alkali or alkaline earth metal salts (preferably sodium salts) of the aforementioned polymers. It is preferred here if the mass fraction of the respective polymer is 0.1 to 1.0% , is preferably from 0.10 to 0.30%, particularly preferably from 0.14 to 0.20%, based on the solids content of the second barrier layer.
  • acrylic acid-acrylamide copolymer poly (acrylic acid- co- acrylamide), acrylic acid-acrylic acid ester-acrylonit
  • the second barrier layer comprises an acrylic acid-acrylamide copolymer (poly (acrylic acid-co- acrylamide) and / or an alkali or alkaline earth metal salt of an acrylic acid-acrylamide copolymer (preferably the sodium salt of acrylic acid-acrylamide It is preferred here if the mass fraction of acrylic acid-acrylamide copolymer is 0.1 to 1.0%, preferably 0.10 to 0.30%, particularly preferably 0.14 to 0.20% , based on the solids content of the second barrier layer
  • the acrylic acid-acrylamide copolymer is particularly preferably a random copolymer.
  • Another aspect of the present invention relates to the use of one or more polymers to improve the fat resistance of a (barrier) paper (preferably a barrier paper according to the invention) in the fold area of the (barrier) paper, the one or more polymers being selected from the group Consists of acrylic acid-acrylamide copolymer (poly (acrylic acid- co -acrylamide), acrylic acid-acrylic acid ester-acrylonitrile copolymer, ethyl acrylate-carboxylic acid copolymer, ethyl acrylate-acrylic acid copolymer, ethyl acrylate-carboxylic acid copolymer, polymethyl methacrylate and alkali or alkaline earth metal salts (preferably sodium salts) of the aforementioned polymers, preferably acrylic acid-acrylamide copolymer (poly (acrylic acid- co- acrylamide) and the sodium salt of acrylic acid-acrylamide copolymer (poly
  • the intermediate layer comprising a pigment in addition to the binder, preferably comprising an inorganic pigment, particularly preferably selected from the group comprising natural or calcined aluminum silicate (in particular natural or calcined kaolinite or natural or calcined kaolin), magnesium silicate hydrate (talc) , Aluminum hydroxide (especially boehmite), bentonite, calcium carbonate and silicon dioxide (silica).
  • an inorganic pigment particularly preferably selected from the group comprising natural or calcined aluminum silicate (in particular natural or calcined kaolinite or natural or calcined kaolin), magnesium silicate hydrate (talc) , Aluminum hydroxide (especially boehmite), bentonite, calcium carbonate and silicon dioxide (silica).
  • the pigment in the intermediate layer is flake-form.
  • flake-form pigments improve the barrier effect of the resulting barrier paper even further. It is assumed that platelet-shaped pigments are superposed in the intermediate layer and that individual pigment layers are formed in the process.
  • the individual pigment layers of flake-form pigments are denser or have a higher barrier effect than, for example, spherical pigments.
  • platelet-shaped pigments in the intermediate layer have a (preferably average) aspect ratio of 3 to 100, preferably 5 to 95, particularly preferably 10 to 90.
  • the (preferably average) aspect ratio of the pigment is greater than 15.
  • 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 Pigments before mixing 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.
  • the second barrier layer consists of or comprises the second barrier layer an acrylate copolymer and a wax based on saturated hydrocarbons.
  • the second barrier layer consists of or comprises the second barrier layer a wax based on saturated hydrocarbons.
  • Barrier papers are preferred according to the invention, the wax based on saturated hydrocarbons having a melting point above 40.degree. C., preferably above 50.degree. C., particularly preferably above 60.degree.
  • barrier papers are preferred in which the wax based on saturated hydrocarbons contains or consists 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, preferably consisting of nonatriacontan, hexatriacontan, heptatriacontan from hexacosane, heptacosane, octacosane, nonacosane and triacontane.
  • barrier papers are particularly preferred, the wax based on saturated hydrocarbons being a wax
  • barrier papers not according to the invention which have an outer barrier layer which comprises a polysaccharide
  • this outer barrier layer adheres to materials that are in contact with during transport or storage stand this barrier layer. After adhering, the barrier layer can no longer be removed without damaging the barrier paper or the adhering material.
  • This negative effect is particularly pronounced with xylans and especially with arabinoxylan.
  • the sticking together can occur, for example, when barrier papers are arranged in a stack or when web-shaped barrier paper is rolled up on a roll.
  • the outer barrier layer comprising a polysaccharide of a barrier paper not according to the invention can adhere to the back of the next layer. If there is high (air) humidity, this effect is further enhanced.
  • a second barrier layer is referred to as adhesive if the second barrier layer has a surface tension that is less than or equal to 30 mN / m. The lower the surface tension of the barrier layer, the less there is any sticking of individual layers.
  • barrier papers are preferred, the second barrier layer having a surface tension of less than or equal to 30 mN / m, preferably less than or equal to 25 mN / m, more preferably less than or equal to 22.5 mN / m.
  • the surface tension of the second barrier layer takes place according to the "lying drop method" (sessile drop method), in which an optical measurement of the contact angle is carried out by means of drop shape analysis with a liquid with a known surface tension and then the contact angle is converted into the surface tension of the barrier layer.
  • the determination and calculation of the surface tension is carried out according to the Owens and Wendt method and is detailed in the article by Owens et al. "Estimation of the Surface Free Energy of Polymers J.
  • the barrier paper has a (printable) layer arranged on the back of the carrier substrate, consisting of or comprising a pigment and a binder where the binder is not starch (layer e).
  • a (printable) layer arranged on the back of the carrier substrate, consisting of or comprising a pigment and a binder where the binder is not starch (layer e).
  • the second barrier layer is designed to be adhesive, gluing can be prevented in a particularly effective manner.
  • first barrier layer and a second barrier layer thus not only shows a synergistic barrier effect in terms of low gas permeability, in particular to water vapor and oxygen, and a particularly good barrier effect to fats, oils and water, but also leads to the first Barrier layer with other materials is reduced or completely prevented.
  • the acrylate copolymer in the second barrier layer is particularly preferably a copolymer with an average molar mass in the range from 50,000 to 150,000 g / mol, preferably in the range from 80,000 to 130,000 g / mol, particularly preferably in the range from 90,000 up to 100,000 g / mol.
  • the mean molar mass is determined with the aid of gel permeation chromatography (GPC) with tetrahydrofuran (THF; tetramethylene oxide; 1,4-epoxybutane; oxacyclopentane) as the solvent, polystyrene as the standard and detection using an RI detector (refractive index detector).
  • the acrylate copolymer in the second barrier layer is particularly preferably 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, acrylic acid 2-ethylhexyl ester, 2-ethylhexyl methacrylate and styrene.
  • the properties of the resulting acrylate copolymer can be optimized through a selection of the monomers used to produce the acrylate copolymer.
  • an acrylate copolymer produced from methyl acrylate, methyl methacrylate, butyl acrylate, butyl methacrylate, 2-ethylhexyl acrylate, 2-ethylhexyl methacrylate and / or styrene has particularly good barrier properties.
  • 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.
  • the acrylate copolymer is particularly preferably a random copolymer.
  • a barrier paper is preferred, wherein, if there is no intermediate layer arranged on the front side of the carrier substrate, the second barrier layer comprises i) an acrylate copolymer and ii) a wax based on a vegetable oil, and if there is none arranged on the front side of the carrier substrate Intermediate layer is present, the second barrier layer comprises i) an acrylate copolymer or ii) a wax based on a vegetable oil.
  • the second barrier layer consists of or comprises the second barrier layer an acrylate copolymer and a wax based on saturated hydrocarbons and a wax based on a vegetable oil.
  • a barrier paper according to the invention is preferred, the crosslinked polysaccharide being a crosslinked xylan or containing a crosslinked xylan, preferably being a crosslinked arabinoxylan or containing a crosslinked arabinoxylan.
  • the first barrier layer prevents migration of mineral eyelets not only when using recycled fibers, but also when barrier papers according to the invention are printed on the back.
  • a barrier paper is particularly preferred according to the invention, the xylan being a xylan from wheat or barley husks. Even if xylans from other vegetable sources are also very suitable, our own studies have shown that xylans from wheat or barley hulls have a particularly good barrier effect against oxygen when used in the first barrier layer.
  • a 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 here if a mixture of starch and xylan (preferably arabinoxylan) is crosslinked so that crosslinking also takes place between starch and xylan molecules.
  • the starch content in the first barrier layer is higher than the xylan content.
  • the starch content in the first barrier layer is higher than the xylan content.
  • barrier papers which comprise a first and a second barrier layer have particularly good properties when the polysaccharide is present in cross-linked form in the first barrier layer. If polysaccharides that are not crosslinked are used in the first barrier layer, the first barrier layer is dissolved or partially dissolved 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, the polysaccharides are mixed with the components of the second barrier layer. As a result, barrier papers are obtained which do not have a distinct first and second barrier layer and have poorer barrier properties (in particular with regard to the barrier effect against gases (in particular oxygen)).
  • Barrier papers in which the polysaccharide was crosslinked 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 bis (ammonium lact) (titanium IV) are preferred according to the invention.
  • CAS No. 65104-06-5; Tyzor LA) and glyoxal derivatives preferably the crosslinking agent is a glyoxal or a glyoxal derivative.
  • 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 first barrier layer.
  • a barrier paper according to the invention is particularly preferred, the carrier substrate having a printable layer arranged on the rear side of the carrier substrate, consisting of or comprising a pigment and a binder, the binder not being starch.
  • a barrier paper according to the invention is preferred, the pigment in the printable layer being an inorganic pigment, preferably selected from the group comprising natural or calcined aluminum silicate (in particular natural or calcined kaolinite or natural or calcined kaolin), magnesium silicate hydrate (talc), Aluminum hydroxide (especially boehmite), bentonite, magnesium carbonate, calcium carbonate, silicon dioxide (silica) and mixtures thereof.
  • natural calcium carbonate as pigment in the printable layer and in particular a mixture of calcium carbonate and magnesium carbonate is particularly preferred.
  • a barrier paper according to the invention is preferred, the printable layer containing a mass fraction in the range from 50 to 95% pigment, preferably 60 to 92% pigment, particularly preferably 75 to 90% pigment, based on the total mass of the printable layer.
  • the binder in the printable layer is a polymeric binder.
  • polymeric binders which can be present in the printable layer all binders customary in papermaking are suitable - with the exception of starch.
  • a suitable selection of the polymeric binder can significantly improve the printing properties of the printable layer and / or the biodegradability of the printable layer.
  • the polymeric binder in the printable layer is a crosslinked or uncrosslinked binder selected from the group consisting of polyvinyl alcohol, carboxyl-modified polyvinyl alcohol, and ethylene-vinyl alcohol copolymer , a combination of polyvinyl alcohol and ethylene-vinyl alcohol copolymer, ethylene-vinyl acetate copolymer, silanol group-modified polyvinyl alcohol, diacetone-modified polyvinyl alcohol, modified polyethylene glycol, unmodified polyethylene glycol, ⁇ -isodecyl- ⁇ -hydroxy-poly (oxy-1,2-ethanediyl), styrene-butadiene latex, styrene-acrylate polymers, acrylic copolymers, phenylethylene - Acrylic copolymers and mixtures thereof.
  • a crosslinked or uncrosslinked binder selected from the group consisting of polyvinyl alcohol, carboxyl-modified polyvinyl alcohol, and ethylene-
  • the polymeric binder in the printable layer is particularly preferably a crosslinked or uncrosslinked binder selected from the group consisting of styrene-butadiene latex, acrylic acid-acrylamide copolymer, phenylethylene-acrylic copolymer and mixtures thereof, very particularly preferably a mixture of styrene-butadiene latex, acrylic acid-acrylamide copolymer and phenylethylene-acrylic copolymer.
  • a barrier paper according to the invention is preferred, the printable layer containing a mass fraction in the range of 5 to 50% binder, preferably 8 to 40% binder, particularly preferably 10 to 25% binder, based on the total mass of the printable layer.
  • the carrier substrate, the printable layer, the intermediate layer, the first barrier layer and the second barrier layer can also contain additives commonly used in papermaking, such as sizing agents, pigments (in addition to the pigments already described above), optical brighteners, biocides, dispersants, Release agents, defoamers, retention agents, fixatives, flocculants, fabric deaerators, wetting agents, leveling agents, slime control agents or thickeners.
  • additives are usually used to adjust the properties of the coating compositions used to produce the respective layer (for example defoamers or retention agents) or to adjust the properties of the resulting layer (for example optical brighteners).
  • a barrier paper is preferred according to the invention, the barrier paper having a water vapor permeability according to DIN 53122-1 of less than or equal to 30 g / (m 2 d), preferably less than or equal to 20 g / (m 2 d), particularly preferably less than or equal to 15 g / ( m 2 d).
  • the barrier paper according to the invention not only has a very high resistance to grease, but also a low water vapor permeability.
  • a low level of water vapor permeability in packaging is desirable for food because the packed food does not dry out prematurely and remains fresh longer.
  • a barrier paper is preferred according to the invention, the barrier paper having a KIT value of at least 7, preferably of at least 11, particularly preferably of at least 12; measured according to the Tappi 559 method.
  • barrier papers according to the invention can have a KIT value of over 12 and thus show excellent bed resistance which is in the same range as the fat resistance of barrier papers coated with plastic or aluminum foil.
  • the barrier paper does not comprise any plastic or aluminum foils. It is particularly preferred if the barrier paper according to the invention does not comprise any extruded plastic films or plastic sheets. According to the invention, it is particularly preferred if the barrier paper does not comprise any plastic films made of polyethylene terephthalate (PET), polyethylene (PE), soft polyethylene (LDPE) or polyethylene (PE).
  • PET polyethylene terephthalate
  • PE polyethylene
  • LDPE soft polyethylene
  • PE polyethylene
  • a barrier paper is preferred according to the invention if the barrier paper has a fat permeability with turpentine oil according to Tappi 454 of at least 1300 s, preferably of at least 1500 s, particularly preferably of at least 1800 s.
  • a barrier paper is preferred, the barrier paper having a fat permeability of at least level 5, preferably of at least level 3, particularly preferably of at least level 1; measured according to the DIN 53116 method.
  • a barrier paper is preferred, the barrier paper having an oxygen permeability according to DIN 53880-3 of less than or equal to 90 cm 3 / (m 2 d), preferably less than or equal to 70 cm 3 / (m 2 d), particularly preferably less than or equal to 50 cm 3 / (m 2 d).
  • a barrier paper is preferred according to the invention, the barrier paper having a hexane vapor permeability at 23 ° C and 50% rh of less than or equal to 70 g / (m 2 d), preferably less than or equal to 60 g / (m 2 d), particularly preferably less than or equal to 50 g / (m 2 d).
  • the barrier paper on the second barrier layer has a Bekk smoothness determined according to ISO 5627 in the range from 10 to 1200 s, provided that the second barrier layer is an outer layer.
  • the Bekk smoothness is not determined on both sides of the barrier paper, but only on the second barrier layer of the barrier paper.
  • the barrier paper has a splitting strength determined according to ISO 16260: 2016 of more than 400 J / m 2 , preferably has a splitting strength of more than 600 J / m 2 , particularly preferably a splitting strength of more than 800 J / m 2 has
  • Another aspect of the present invention relates to the use of a barrier paper according to the invention as wrapping paper, bags, sachets, backing paper, intermediate and / or release paper, preferably for food, preferably for wrapping, underlaying, interposing and / or separating baked goods, fried and / or deep-fried goods, snacks, sandwiches, bread, burgers, meat products, sausage products and / or cheese.
  • barrier paper according to the invention has a high barrier effect against gaseous or vaporized flavoring substances and against flavoring oils.
  • the coating composition used in a method according to the invention for producing a barrier paper reference is made here to the statements on the composition of the individual layers.
  • the coating compositions are designed in such a way that the layers present in a barrier paper according to the invention result therefrom.
  • the coating compositions are usually in the form of an aqueous dispersion and contain the constituents or compounds (e.g. monomers or crosslinking agents) present in the individual layers, which react to form the constituents.
  • the coating compositions can also contain 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.
  • additives commonly used in papermaking can be used in the customary amounts.
  • the person skilled in the art knows various techniques which are referred to as painting, for example: blade painting, film press painting, cast painting, curtain painting (" Curtain Coating "), knife coating, air brush coating or spray coating. All of these known above-mentioned painting techniques are suitable for applying the coating composition according to the invention to a carrier substrate, preferably a paper substrate which comprises one or more precoats or intermediate coats or which also does not comprise a precoat or intermediate coat. According to the invention, curtain coating is preferred.
  • the barrier paper according to the invention is preferably at least biodegradable.
  • Biodegradability is defined in such a way that a material can be biodegraded under anaerobic or aerobic conditions, so that in this process, depending on the environmental conditions, CO 2 , H 2 O, methane, biomass and mineral salts are released.
  • Naturally occurring microorganisms which mainly feed on organic waste, play an important role here.
  • the barrier paper according to the invention is preferably compostable.
  • Composting describes the decomposition process of organic waste via microbial digestion to produce compost. Compost has many uses, including improving and fertilizing the soil. For the composting process, the organic waste needs the right temperature and the right amount of water and oxygen. In a pile of organic waste there are millions of tiny microbes that allow it to migrate through your digestive system, turning the organic matter into compost.
  • the barrier paper according to the invention is particularly preferably recyclable.
  • Recycling of material residues is understood to mean the return of material used in production or consumption.
  • the carrier substrate used was a paper substrate made from a 1: 1 mixture of short fiber and long fiber pulp and an additive with a mass fraction of 1% talc as filler, based on the total mass of the paper substrate, on a paper machine one in the mass with resin sizing provided paper web with a mass per unit area of 70 g / m 2 was produced.
  • the paper substrate produced was calendered at a line load of 80 kN / m and a temperature of 80 ° C.
  • an intermediate layer coating composition which was in the form of an aqueous dispersion, was applied to the front and this coating composition was then dried using IR, air drying and a drying cylinder, so that an intermediate layer with a basis weight of 10 g / m 2 resulted.
  • the composition of the interlayer coating composition (excluding water) is shown in Table 1.
  • a first barrier coating composition which was present as an aqueous dispersion, was applied to the intermediate layer produced, and this coating composition was then dried with the aid of IR and air drying, so that a first barrier layer with a basis weight of 5.5 g / m 2 resulted .
  • the composition of the first barrier coating composition (excluding water) is given in Table 1.
  • a second barrier coating composition which was present as an aqueous dispersion, was applied to the first barrier layer produced, and this coating composition was then dried with the aid of IR and air drying, so that a second barrier layer with a basis weight of 9.5 g / m 2 2 resulted.
  • the composition of the second barrier coating composition (excluding water) is given in Table 1.
  • the resulting barrier paper which could be heat-sealed at 150 ° C., had a basis weight of 95 g / m 2 and was measured for its properties.
  • Table 1 component component Mass fraction Interlayer coating composition (plus water): kaolin pigment 60-80% Defoamer 0.20 - 0.30% Mixture of 5-chloro-2-methyl-2H-iso-thiazol-3-one and 5-methyl-2H-isothiazol-3-one 0.50 - 0.70% binder 20-40%
  • First barrier coating composition (plus water): Mixture of non-ionic surfactants Wetting agents 0.20 - 0.40% Glyoxal Crosslinking agents 0.35 - 0.45% Xylan Barrier means 98.00 - 99.50%
  • Example 1 was repeated, but the carrier substrate used was a paper substrate made from a 1: 1 mixture of short fiber and long fiber pulp and an additive with a mass fraction of 1% talc as filler and 20% starch, based on the total mass of the paper substrate , a paper web provided in the mass with resin sizing with a mass per unit area of 70 g / m2 was produced on a paper machine.
  • the carrier substrate used was a paper substrate made from a 1: 1 mixture of short fiber and long fiber pulp and an additive with a mass fraction of 1% talc as filler and 20% starch, based on the total mass of the paper substrate , a paper web provided in the mass with resin sizing with a mass per unit area of 70 g / m2 was produced on a paper machine.
  • the resulting barrier paper which could be heat-sealed at 150 ° C., had a basis weight of 95 g / m 2 and was measured for its properties.
  • Table 3 value Determination method Water vapor permeability: 13.4 g / (m 2 * day) DIN 53122-1 KIT value: 12th Tappi 559 Fat permeability test with palm kernel fat: Level 1 DIN 53116 Fat permeability test with turpentine oil: +1800 s Tappi 454 Smoothness according to Bekk: 15s ISO 5627 Splitting strength 835 J / m 2 ISO 16260: 2016
  • the barrier paper from Example 2 had increased splitting strength.
  • Example 1 was repeated, but the carrier substrate used was a paper substrate made of a 1: 1 mixture of short fiber and long fiber pulp and an additive with a mass fraction of 1% talc as filler and 20% carboxymethyl cellulose, based on the total mass of the paper substrate , a paper web provided in the mass with resin sizing with a mass per unit area of 70 g / m2 was produced on a paper machine.
  • the carrier substrate used was a paper substrate made of a 1: 1 mixture of short fiber and long fiber pulp and an additive with a mass fraction of 1% talc as filler and 20% carboxymethyl cellulose, based on the total mass of the paper substrate , a paper web provided in the mass with resin sizing with a mass per unit area of 70 g / m2 was produced on a paper machine.
  • the barrier paper from example 3 had an increased splitting strength.

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Wrappers (AREA)
  • Paper (AREA)
  • Laminated Bodies (AREA)
EP20197872.3A 2019-09-23 2020-09-23 Papier barrière imprimable et scellable à chaud Withdrawn EP3795746A1 (fr)

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DE102022122470A1 (de) 2022-09-05 2024-03-07 Koehler Innovation & Technology Gmbh Barrierepapier
DE102022210442A1 (de) * 2022-09-30 2024-04-04 Koehler Innovation & Technology Gmbh Bio-basierte Komposite als Wasserdampfbarriere auf Papier
WO2024208663A1 (fr) * 2023-04-05 2024-10-10 Delfortgroup Ag Matériau d'emballage à effet barrière amélioré
WO2024256573A1 (fr) * 2023-06-15 2024-12-19 Koehler Innovation & Technology Gmbh Matériau d'emballage respectueux de l'environnement
WO2024256567A1 (fr) * 2023-06-15 2024-12-19 Koehler Innovation & Technology Gmbh Matériau d'emballage respectueux de l'environnement
WO2025051147A1 (fr) * 2023-09-04 2025-03-13 中国制浆造纸研究院有限公司 Papier de revêtement à régulation d'humidité exempt aluminium pour cigarette, et son procédé de préparation
WO2025186416A1 (fr) * 2024-03-07 2025-09-12 Koehler Innovation & Technology Gmbh Papier couché

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EP3342929A1 (fr) * 2016-12-30 2018-07-04 Mitsubishi HiTec Paper Europe GmbH Papier barrière
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Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102022122470A1 (de) 2022-09-05 2024-03-07 Koehler Innovation & Technology Gmbh Barrierepapier
WO2024052337A1 (fr) * 2022-09-05 2024-03-14 Koehler Innovation & Technology Gmbh Papier barrière
DE102022210442A1 (de) * 2022-09-30 2024-04-04 Koehler Innovation & Technology Gmbh Bio-basierte Komposite als Wasserdampfbarriere auf Papier
WO2024208663A1 (fr) * 2023-04-05 2024-10-10 Delfortgroup Ag Matériau d'emballage à effet barrière amélioré
WO2024256573A1 (fr) * 2023-06-15 2024-12-19 Koehler Innovation & Technology Gmbh Matériau d'emballage respectueux de l'environnement
WO2024256567A1 (fr) * 2023-06-15 2024-12-19 Koehler Innovation & Technology Gmbh Matériau d'emballage respectueux de l'environnement
WO2025051147A1 (fr) * 2023-09-04 2025-03-13 中国制浆造纸研究院有限公司 Papier de revêtement à régulation d'humidité exempt aluminium pour cigarette, et son procédé de préparation
WO2025186416A1 (fr) * 2024-03-07 2025-09-12 Koehler Innovation & Technology Gmbh Papier couché

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