US20200370244A1 - Recyclable barrier paper - Google Patents

Recyclable barrier paper Download PDF

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Publication number
US20200370244A1
US20200370244A1 US16/956,049 US201816956049A US2020370244A1 US 20200370244 A1 US20200370244 A1 US 20200370244A1 US 201816956049 A US201816956049 A US 201816956049A US 2020370244 A1 US2020370244 A1 US 2020370244A1
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United States
Prior art keywords
paper
barrier
oil
wax
barrier layer
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US16/956,049
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English (en)
Inventor
Dieter Becker
Nadia El-Karzazi
Konstantinos Kalessios
Jochen Schlegel
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Mitsubishi HiTec Paper Europe GmbH
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Mitsubishi HiTec Paper Europe GmbH
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Publication of US20200370244A1 publication Critical patent/US20200370244A1/en
Assigned to MITSUBISHI HITEC PAPER EUROPE GMBH reassignment MITSUBISHI HITEC PAPER EUROPE GMBH ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: SCHLEGEL, JOCHEN, Kalessios, Konstantinos, BECKER, DIETER
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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
    • D21H17/00—Non-fibrous material added to the pulp, characterised by its constitution; Paper-impregnating material characterised by its constitution
    • D21H17/20—Macromolecular organic compounds
    • D21H17/33—Synthetic macromolecular compounds
    • D21H17/34—Synthetic 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
    • D21H17/00—Non-fibrous material added to the pulp, characterised by its constitution; Paper-impregnating material characterised by its constitution
    • D21H17/60—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
    • D21H19/80—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
    • 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 barrier paper, to the use of a barrier paper of the invention as wrapping paper, lining paper, paper for inner-bag packaging, interleaving paper and/or release paper for foods, and a method for producing a barrier paper.
  • WO 2007/050964 A1 describes a fat-resistant and water-resistant article that comprises a coating of a paraffin wax and polyvinyl alcohol.
  • US 2003/0152707 A1 describes a carrier coated with a wax made from a vegetable oil, and which is highly resistant to water.
  • DE 10 2014 119 572 A1 describes a packaging paper for foods that has an areal density of between 20 g/m 2 and 40 g/m 2 and that has a mass fraction of filler of less than 20%, based on the mass of the uncoated paper.
  • the packaging paper at least on one side has a coating that comprises a polymer-encapsulated vegetable oil, talc, and a binder.
  • Wet beating is achieved by wide bars set widely apart or by basalt rock barring in conjunction with a long beating time.
  • the fibers, rather than being shredded, are squeezed. This produces a high swelling fiber mucilage, a slimy and greasy pulp, which undergoes only slow dewatering on the paper machine.
  • the paper acquires a high density, but loses opacity. It becomes glassily translucent.
  • the term “long wet” is used. Fibers shortened to a greater extent are referred to as “short wet”. Where the substrate is made predominantly short wet fibers, its tear initiation resistance and tearing resistance are only low.
  • Composite packaging may consist, for example, of a composite formed from a paper and from a polymeric and/or aluminum foil. If no polyethylene coating (PE) takes place, fluorocarbons can be used as water-repellent chemicals. Paper here is coated for example on one side with polyethylene, frequently in an extrusion process, or with an aluminum foil.
  • Composite packaging of this kind is notable for high fat resistance. This composite packaging, however, cannot easily be passed for paper recycling, since first it is necessary for the foil layer to be removed. Nor is it possible to compost these composites, because the polymeric or aluminum foils used do not biodegrade.
  • barrier paper namely a high and/or defined resistance to penetration by fats, oils, water, and water vapor, and high reusability or biodegradability, are requirements that typically contradict one another.
  • packaging paper for food that can be produced wholly or predominantly from renewable raw materials and at the same time can be effectively reused or biodegraded.
  • barrier paper 10 comprising:
  • barrier layer 12 comprises or consists of a polymeric binder and a wax based on a vegetable oil.
  • barrier papers according to one aspect of the invention exhibit high resistance to fats and/or oils and/or moisture and at the same time can be produced wholly or predominantly from renewable raw materials.
  • the barrier layer is designed such that it does not part from the paper substrate or that the wax transfers to other articles or the foods.
  • a wax based on a vegetable oil is understood to mean a wax obtained by chemical modification of a vegetable oil.
  • the chemical modification may, for example, be a partial or complete hydrogenation with a metallic catalyst, for example nickel, and hydrogen, wherein all or some of the double bonds in the oil are hydrogenated to single bonds.
  • a metallic catalyst for example nickel
  • waxes are not in liquid form but in solid form at 20° C. The effect of the chemical modification of the vegetable oil is thus an increase in the melting point.
  • a vegetable oil is understood to mean a fatty acid triglyceride that is obtained from plants or plant parts.
  • the oil is typically obtained by pressing, extraction or refining of the oils from the plants or plant parts.
  • the obtaining of the oils is known to the person skilled in the art. If plant seeds are used for obtaining oil, these are referred to as oilseeds.
  • the oil in the seeds is in the form of lipids that constitute the cell membranes and energy reserves thereof.
  • nondrying oils for example olive oil
  • semidrying oils for example soybean oil or rapeseed oil
  • drying oils for example linseed oil or poppyseed oil.
  • drying here does not mean evaporation, but rather the solidification of the oil caused by oxidation and polymerization of the unsaturated fatty acids. Preference is given to the use of semidrying and drying oils as starting material for production of the waxes used in accordance with one aspect of the invention.
  • Possible sources for vegetable oil are aça ⁇ oil, algae oil, argan oil (from the fruit of the argan tree), avocado oil (from the fruit flesh of the avocado from the avocado tree), babaçu oil, cottonseed oil (from the seeds of the cotton plant), borage oil or borageseed oil (from the seeds of the borage plant), cupuaçu butter, cashewshell oil, safflower oil (also called “saflor oil”, from the seeds of the safflower or carthamus), peanut oil (from the fruit of the peanut plant), hazelnut oil (from hazelnuts from 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
  • the wax based on a vegetable oil is a wax based on an oil selected from the list encompassing palm oil, coconut oil, poppyseed oil, olive oil, linseed oil, soybean oil, sunflower oil, safflower oil, and rapeseed oil
  • the wax based on a vegetable oil preferably being a wax based on a soybean oil, i.e., soybean oil wax or soy wax.
  • waxes made from the oils specified as preferred above have particularly good properties.
  • the waxes produced from these oils are notable for high durability and can be produced with high melting points.
  • the waxes used in accordance with one aspect of the invention namely palm oil wax, coconut oil wax, poppyseed 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 resistance to fats and/or oils and/or moisture when used in barrier papers of the invention.
  • soybean oil wax is preferred in accordance with the invention.
  • soybean oil wax when soybean oil wax is used, not only the resistance to fat, oil, and moisture but also very low water vapor permeability can be obtained. Soybean oil wax additionally has the advantage that it can be produced in taste- and odor-neutral form.
  • barrier papers wherein the wax has a melting point above 40° C., preferably above 50° C., more preferably above 60° C.
  • Suitable polymeric binders are all binders that are customary in papermaking. Our own investigations, however, have shown that a suitable selection of the binder may significantly improve the mechanical properties of the barrier layer and/or the biodegradability of the barrier paper. Our own investigations have shown that it is advantageous and therefore preferred in accordance with the invention if the polymeric binder is a crosslinked or noncrosslinked binder selected from the group consisting of starch, 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, ⁇ -isodecyl- ⁇ -hydroxy-poly(oxy-1,2-ethanediyl), styrene-butadiene late
  • barrier papers of one aspect of the invention have particularly high resistance to fat, oil, and moisture if the polymeric binder is one or more styrene-acrylate polymers or the binder comprises the latter.
  • ethylene-vinyl alcohol copolymer and polyvinyl alcohol are the least preferred. Particular preference is therefore given to barrier papers of one aspect of the invention, which do not comprise ethylene-vinyl alcohol copolymer and/or polyvinyl alcohol in the barrier layer.
  • the barrier layer comprises no ethylene.
  • the mass fraction of the polymeric binder in the barrier layer is 94 to 2%, preferably 80 to 10%, more preferably 50 to 11%, based on the total mass of the barrier layer.
  • the mass fraction of the polymeric binder in the barrier layer is 94 to 2% and the mass fraction of the wax in the barrier layer is 6 to 98%, and it is further preferred if the mass fraction of the polymeric binder in the barrier layer is 80 to 10% and the mass fraction of the wax in the barrier layer is 80 to 90%, and it is preferred still further if the mass fraction of the polymeric binder in the barrier layer is 50 to 11% and the mass fraction of the wax in the barrier layer is 50 to 89%.
  • barrier papers wherein the mass per unit area of the barrier layer is in the range from 1.5 to 8 g/m 2 , preferably in the range from 2.0 to 5.5 g/m 2 , more preferably in the range from 3.0 to 5.0 g/m 2 . It has surprisingly emerged that barrier papers with the low masses per unit area as specified here have very good resistances with respect to fat, oil, and moisture. While the resistance can be slightly improved by increasing the mass per unit area, the improvement is only minimal, and so the slight improvement is not justified by increased consumption of material.
  • the resistance of the pure carrier substrate is indeed likewise improved, but the resistance is not always sufficient for certain areas of application (e.g., very fatty and moist foods).
  • Our own investigations have shown that an optimum resistance can be obtained if the mass per unit area of the barrier layer is in the range from 3.0 to 5.0 g/m 2 .
  • the polymeric binder consists of two or more binders and at least one binder is an anionic binder.
  • An anionic binder here is understood to mean a binder that comprises a plurality of negative charges, which are stabilized by cations (e.g., metal cations or ammonium).
  • a polymeric binder is understood to mean a binder which has been synthesized by polycondensation from a multitude of molecules, and in which one or more kinds of atoms or atomic moieties (called repeat units) are strung together repeatedly, with the number of repeat units per molecule being more than 25.
  • the glass transition temperature of the anionic binder as determined by differential scanning calorimetry is less than or equal to 120° C.
  • DSC differential scanning calorimetry
  • the anionic binder is a copolymer.
  • Suitable anionic binders are, for example, partly or fully deprotonated polyacrylic acid (or copolymers thereof, with acrylic esters, for example), partly or fully deprotonated polymethacrylic acid (or copolymers thereof, with methacrylic esters, for example), copolymers of polyacrylic esters (preferably methyl or ethyl esters), copolymers of polymethacrylic esters (preferably methyl or ethyl esters), or polyacrylamides, or copolymers thereof.
  • an aqueous solution or dispersion of the anionic binder has a basic pH, where present in dispersion or solution in water with a mass fraction of 10%, and preferably in the range from 8 to 10.
  • an aqueous solution or dispersion of the anionic binder can be prepared that has a mass fraction of 10%, and the pH can be determine by customary means.
  • the barrier layer ( 12 ) additionally comprises a wax based on saturated hydrocarbons.
  • barrier papers wherein the wax based on saturated hydrocarbons has a melting point above 40° C., preferably above 50° C., more preferably above 60° C.
  • the wax based on saturated hydrocarbons comprises 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, preferably selected from the group consisting of hexacosane, heptacosane, octacosane
  • the acrylate copolymer in the barrier layer is a copolymer having an average molar mass in the range from 50000 to 150000 g/mol, preferably in the range from 80000 to 130000 g/mol, more preferably in the range from 90000 to 100000 g/mol.
  • the average molar mass is determined here with the aid of gel permeation chromatography (GPC) with tetrahydrofuran (THF; tetramethylene oxide; 1,4-epoxybutane; oxacyclopentane) as solvent, polystyrene as standard, and detection by RI detector (refractive index detector).
  • GPC gel permeation chromatography
  • the acrylate copolymer in the barrier layer is a copolymer prepared using 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.
  • an acrylate copolymer that has been prepared 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
  • further monomers may have been used here for preparation of the acrylate copolymer, or the copolymer has been prepared 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 a random copolymer.
  • barrier paper ( 10 ) comprising
  • barrier paper wherein the barrier paper additionally comprises an interlayer 13 and the interlayer 13 is disposed between the paper substrate and the barrier layer.
  • the barrier paper additionally comprises an interlayer 13 and the interlayer 13 is disposed between the paper substrate and the barrier layer.
  • the interlayer 13 comprises a pigment.
  • the pigment is an inorganic pigment selected from the list consisting of calcined kaolin, kaolin, kaolinite, hydrated magnesium silicate, silicon oxide, bentonite, calcium carbonate, aluminum hydroxide, aluminum oxide, and boehmite.
  • the pigment is lamellar in formation, preferably with an aspect ratio of 5 to 100, more preferably of 15 to 100, very preferably of 20 to 80.
  • the aspect ratio is the quotient formed between the diameter and the thickness of the lamellar pigment platelet prior to mixing with the further components.
  • An aspect ratio of 20 means that the diameter of the platelet is 20 times greater than the thickness of the platelet.
  • Kaolin, kaolinite, and talc, for example, are lamellar and therefore particularly preferred as pigment.
  • the interlayer comprises a binder and the binder is preferably a crosslinked or noncrosslinked binder selected from the group consisting of starch, 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, acrylate copolymer, modified polyethylene glycol, unmodified polyethylene glycol, ⁇ -isodecyl- ⁇ -hydroxy-poly(oxy-1,2-ethanediyl), styrene-butadiene latex, styrene-acrylate polymers, film-forming acrylic copolymers, and mixtures thereof.
  • a crosslinked or noncrosslinked binder selected from the group consisting of starch, polyvinyl alcohol, carboxyl group-modified
  • the binder comprises or consists of one or more acrylate copolymers and/or styrene-acrylate polymers.
  • Preferred in accordance with one aspect of the invention are barrier papers wherein the mass per unit area of the interlayer is in the range from 1.5 to 6 g/m 2 , preferably in the range from 2.0 to 5.5 g/m 2 , more preferably in the range from 2.0 to 4.8 g/m 2 .
  • Preferred in accordance with one aspect of the invention are barrier papers wherein the paper substrate features a short-fiber pulp having a Schopper-Riegler freeness of at least 30° SR and a long-fiber pulp having a Schopper-Riegler freeness of at least 25° SR and wherein the paper substrate comprises at least a mass fraction of 50% of short-fiber pulp, based on the total mass of short-fiber pulp and long-fiber pulp.
  • the short-fiber pulp has a Schopper-Riegler freeness of at least 35° SR, preferably of at least 39° SR, and/or the long-fiber pulp has a Schopper-Riegler freeness of at least 30° SR, preferably of at least 33° SR.
  • the paper substrate comprises a mass fraction of at least 70% of short-fiber pulp, preferably between 70 and 75% of short-fiber pulp, based on the total mass of short-fiber pulp and long-fiber pulp.
  • the barrier paper on one side or on both sides has a Bekk smoothness, determined to ISO 5627, in the range from 100 to 1200 s. It is preferred here if the barrier layer has a Bekk smoothness in the range from 100 to 1200 s insofar as the barrier layer is an outer layer. In deviation from ISO 5627, the Bekk smoothness in this case is determined not on both sides of the barrier paper, but only on the barrier layer of the barrier paper.
  • a barrier paper Preference is given in accordance with one aspect of the invention to a barrier paper if the barrier paper has a water vapor permeability to DIN 53122-1 of less than or equal to 300 g/(m 2 d), preferably less than or equal to 250 g/(m 2 d), more preferably of less than or equal to 150 g/(m 2 d).
  • the barrier paper of one aspect of the invention has not only a very high resistance toward fat but also a low water vapor permeability.
  • a low water vapor permeability in the case of packaging is desirable in the case of foods because the packaged foods do not dry out prematurely and remain fresh for longer.
  • barrier papers of one aspect of the invention can have a KIT rating of more than 12 and hence exhibit excellent bed resistance, situated within the same range as the fat resistance of barrier papers coated with polymeric or aluminum foil.
  • a barrier paper Preference is given in accordance with one aspect of the invention to a barrier paper if the barrier paper has a fat permeability with turpentine oil to Tappi 454 of at least 1300 s, preferably of at least 1500 s, more preferably of at least 1800 s.
  • a barrier paper wherein the barrier paper has a fat permeability of at least level 5, preferably of at least level 3, more preferably of at least level 1, measured by the DIN 53116 method.
  • the carrier paper used is paper, paperboard or cardboard.
  • the mass per unit area of the resultant barrier paper is higher than 120 g/m 2 .
  • the mass per unit area is in the range from 120 g/m 2 to 600 g/m 2 in the case of cardboard and more than 600 g/m 2 in the case of cardboard.
  • a barrier paper Preference is given in accordance with one aspect of the invention to a barrier paper if the wax based on a vegetable oil and the polymeric binder are distributed homogeneously in the barrier layer. In this case it is not absolutely necessary for the wax and the polymeric binder to be thoroughly mixed; instead, there may be local differences in concentration, resulting from the specific production using small wax particles. In accordance with the invention, however, the wax is not encapsulated—in other words, it does not have a core-shell structure.
  • Preferred in accordance with one aspect of the invention is a barrier paper for use as wrapping paper, lining paper, interleaving paper and/or release paper for foods, preferably for the packaging of bakery products, sandwiches, bread, burgers, meat products, fish, sausage products and/or cheese.
  • the paper substrate is coated both to the front side and to the back side with the barrier layer, and preferably there is an interlayer disposed in each case between the barrier layers and the paper substrate.
  • an interlayer disposed in each case between the barrier layers and the paper substrate.
  • the barrier papers of the invention not only have excellent resistance toward fats and/or oils and/or moisture, but also, moreover, possess a barrier effect or blocking effect with respect to mineral oils.
  • Mineral oils occur frequently in recycled papers or paperboards that are not intended for the direct packaging of foods. Where, however, they do come into contact with foods, as for example if foods are dispatched in a cardboard box, it is impossible to rule out mineral oils transferring onto the food, even if the foods are packed in a separate packaging. In the past, for example, mineral oil residues have been found in chocolate from Advent calenders, having been absorbed from the chocolate by the contact of the chocolate with the cardboard packaging.
  • Barrier papers of the invention are notable, surprisingly, for not only preventing the emergence of fats, oils, and moisture from the food to the outside, but also, additionally, protecting the food packaged therewith from contamination by mineral oils.
  • packaging cartons from barrier papers of the invention, these cartons having the barrier layer in the interior of the packaging carton.
  • inner-bag packaging from barrier papers of one aspect of the invention.
  • a further aspect of the present invention relates to the use of a barrier paper of the invention as wrapping paper, lining paper, paper for inner-bag packaging, interleaving paper and/or release paper for foods, preferably for the wrapping, lining, interleaving and/or separation of bakery products, fried and/or deep-fried products, snack products, sandwiches, bread, burgers, meat products, fish products, sausage products, and/or cheese.
  • a further aspect of the present invention relates to the use of a barrier paper of the invention for packaging foods, preferably for packaging fatty foods, with the barrier paper repelling the fat from the food.
  • a further aspect of the present invention relates to a method for producing a barrier paper, preferably a barrier paper of the invention, comprising the following steps:
  • the wax emulsion is a wax-in-oil emulsion and the wax emulsion additionally comprises an anionic polymeric binder which is preferably suitable for stabilizing the wax emulsion.
  • the produced or provided barrier coat comprises a (further) polymeric binder besides the wax emulsion.
  • the average particle size of the wax particles is in the range from 600 to 1100 nm, preferably in the range from 700 to 1000 nm.
  • the particle size of the wax particles can be determined using laser diffraction particle size analysis. Our own investigations have shown that particles of this order of size lead to barrier layers having very good barrier and mechanical properties, since there is effective mixing between polymeric binder and wax particles.
  • the wax emulsion is basic and preferably has a pH in the range from 8 to 10.
  • the wax based on a vegetable oil is a soy wax.
  • the drying of the barrier coat takes place at a temperature above the melting point of the wax (e.g., at 40, 60, 80 or 100° C.) and/or in a separate step the paper substrate comprising the (optionally dried) barrier coat is heated above the melting point of the wax (e.g., at 40, 60, 80 or 100° C.).
  • a coated paper substrate is used as paper substrate or a coat is applied to one sides of the paper substrate and the coat is then dried, to give an interlayer, before the barrier coat is applied.
  • the method of one aspect of the invention additionally comprises the following steps:
  • steps a) and b) are carried out preferably between the steps i) and ii).
  • a further aspect of one aspect of the present invention relates to a barrier paper produced by a method of the invention.
  • a further aspect of the present invention relates to a the use of a wax based on a vegetable oil for producing a paper coating, preferably for producing a barrier layer of a barrier paper.
  • FIG. 1 is a layer construction of barrier paper
  • FIG. 2 is a layer construction of barrier paper
  • FIG. 3 is a layer construction of barrier paper
  • FIG. 4 is a layer construction of barrier paper.
  • FIG. 1 shows a barrier paper 10 that consists of a paper substrate 11 and a barrier layer 12 .
  • the paper substrate has a front side and a back side opposite the front side, and disposed on the front side of the paper substrate 11 is a barrier layer 12 , which consists of a polymeric binder and a wax based on a vegetable oil.
  • FIG. 2 shows a barrier paper 10 that consists of a paper substrate 11 , an interlayer 13 , and a barrier layer 12 .
  • the paper substrate has a front side and a back side opposite the front side, and disposed on the front side of the paper substrate 11 is the interlayer 13 .
  • Disposed on the interlayer 13 is the barrier layer 12 , which consists of a polymeric binder and a wax based on a vegetable oil.
  • the interlayer 13 preferably comprises a pigment and a binder.
  • FIG. 3 shows a barrier paper 10 that consists of a paper substrate 11 and two barrier layers 12 .
  • the paper substrate has a front side and a back side opposite the front side, and disposed on each of the front side and the back side of the paper substrate 11 is a respective barrier layer 12 , which consists of a polymeric binder and a wax based on a vegetable oil.
  • FIG. 4 shows a barrier paper 10 that consists of a paper substrate 11 , two interlayers 13 , and two barrier layers 12 .
  • the paper substrate has a front side and a back side opposite the front side, and, disposed on each of the front side and the back side of the paper substrate 11 , there is a respective interlayer 13 .
  • Disposed on each of the interlayers 13 in turn is a respective barrier layer 12 , which consists of a polymeric binder and a wax based on a vegetable oil.
  • the interlayers preferably comprise a pigment and a binder.
  • Example 1 Production of a Barrier Paper of the Invention
  • a paper web provided with resin sizing in the stock and having a mass per unit area of 33.3 g/m 2 was produced on a paper machine from short-fiber stocks (100% short-fiber pulp) having a freeness of 50° SR and with addition of talc as filler with a mass fraction of 1%, based on the total mass of the paper substrate.
  • the paper substrate produced was calendered under a linear load of 100 kN/m and a temperature of 100° C.
  • a curtain coater was used to apply, to the front side, a priming coat comprising water, an aqueous dispersion of an acrylic-acetate copolymer (solids content 33%, mass fraction in the priming coat 0.03% (oven-dry); Sterocoll BL), an aqueous dispersion of an acrylic copolymer (solids content 40%, mass fraction in the priming coat 1.27% (oven-dry); trade name: Sterocoll FS), an aqueous dispersion of a styrene-acrylate copolymer (solids content 50%, mass fraction in the priming coat 70.5% (oven-dry); trade name: Sterocoll FS), and kaolin (solids content 70%, mass fraction in the priming coat 28.2% (oven-dry); trade name: Capim NP), with a coat weight of 3.5 g/m 2 , and the priming coat was subsequently dried by IR and air drying, to give an interlayer.
  • a priming coat comprising
  • a curtain coater was used to apply, to the interlayer, a barrier coat comprising water, a wax based on a vegetable oil (solids content 30%, mass fraction in the priming coat 82% (oven-dry); trade name: SWX 155), a polyacrylate dispersion (solids content 48%, mass fraction in the priming coat 16.4% (oven-dry); trade name: Tecryl PB 16/3), and a mixture of nonionic surfactants (solids content 100%, mass fraction in the priming coat 1.6% (oven-dry); trade name: Metolat 700), with a coat weight of 4 g/m 2 , and the barrier coat was subsequently dried by means of IR and air drying, to give a barrier layer.
  • a barrier coat comprising water, a wax based on a vegetable oil (solids content 30%, mass fraction in the priming coat 82% (oven-dry); trade name: SWX 155), a polyacrylate dispersion (solids content 48%, mass fraction in the priming coat 16.4%
  • the barrier paper of the invention exhibits fat resistance outstandingly and a low water vapor permeability.

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Paper (AREA)
  • Wrappers (AREA)
US16/956,049 2017-12-22 2018-12-18 Recyclable barrier paper Pending US20200370244A1 (en)

Applications Claiming Priority (3)

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DE102017131277.3A DE102017131277A1 (de) 2017-12-22 2017-12-22 Recyclingfähiges Barrierepapier
DE102017131277.3 2017-12-22
PCT/EP2018/085566 WO2019121733A1 (fr) 2017-12-22 2018-12-18 Papier barrière recyclable

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EP (1) EP3728735A1 (fr)
JP (1) JP2021507125A (fr)
CN (1) CN111511987A (fr)
DE (1) DE102017131277A1 (fr)
WO (1) WO2019121733A1 (fr)

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CN111511987A (zh) 2020-08-07
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EP3728735A1 (fr) 2020-10-28
DE102017131277A1 (de) 2019-06-27

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