EP3728735A1 - Papier barrière recyclable - Google Patents

Papier barrière recyclable

Info

Publication number
EP3728735A1
EP3728735A1 EP18826302.4A EP18826302A EP3728735A1 EP 3728735 A1 EP3728735 A1 EP 3728735A1 EP 18826302 A EP18826302 A EP 18826302A EP 3728735 A1 EP3728735 A1 EP 3728735A1
Authority
EP
European Patent Office
Prior art keywords
barrier
oil
paper
wax
barrier layer
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.)
Pending
Application number
EP18826302.4A
Other languages
German (de)
English (en)
Inventor
Dieter Becker
Nadia EL-KARZAZI
Konstantinos Kalessios
Jochen Schlegel
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 EP3728735A1 publication Critical patent/EP3728735A1/fr
Pending legal-status Critical Current

Links

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, the use of a barrier paper according to the invention as a wrapping paper, Unterleg paper, paper for inner bag packaging, intermediate and / or release paper for food and a method for producing a barrier paper.
  • Loosely offered foods such as sausage, cheese or baked goods, are usually handed over to customers in a packaging for hygiene or freshness reasons.
  • High demands are placed on the packaging, especially for fatty foods.
  • fat-containing foods it is possible for fat-containing foods to penetrate the packaging material with the fat from the food. This may cause the packaging material to soften and tear or contaminate other items with the grease when in contact with the package.
  • WO 2007/050964 A1 describes a fat- and water-resistant article which contains a coating of a paraffin wax and polyvinyl alcohol.
  • US 2003/0152707 A1 describes a carrier coated with a wax of a vegetable oil, which has a high resistance to water.
  • DE 10 2014 119 572 A1 discloses a packaging paper for foodstuffs with a basis weight of between 20 g / m 2 and 40 g / m 2 , and with a mass fraction of filler which is less than 20% based on the mass of the uncoated paper , describe.
  • the packaging paper has at least on one side a coating comprising a vegetable oil encapsulated in a polymer, talc and a binder.
  • a greasy grind is achieved by wide, widely spaced knives or a basalt stone reinforcement with a long grinding time.
  • the fibers are not cut but squeezed.
  • the result is a highly swelling fiber slime, a slippery greasy substance that drains only slowly on the paper machine.
  • the paper gains high density but loses opacity. It becomes glassy-translucent. Slight fiber shortening is referred to as "greasy-long.” Stronger shortened fibers are termed "greasy-short.” If the substrate is made predominantly greasy-short fibers, it has only a low tear and tear propagation resistance.
  • a more resistant alternative to sandwich paper is often a composite material.
  • a composite packing material may for example consist of a verb and fabric, formed from a paper and a plastic and / or aluminum foil. If not PE coated, fluorocarbons can be used as water repellent chemicals. In this case, for example, paper is coated on one side with polyethylene, often in an extrusion process, or on an aluminum foil.
  • These composite packagings are characterized by their high grease resistance. However, these composite materials can not be readily recycled paper, since first the film layer must be removed. Nor is it possible to compost these composites because the plastic or aluminum foils used are not biodegraded.
  • Growing concern about the lack of fossil, non-renewable resources, such as oil or natural gas, has led to a growing interest in the production of materials from renewable resources.
  • the object of the present invention is to provide a barrier paper for contact with foodstuffs, which has a high resistance to fats and / or oils and / or moisture and / or water or water vapor, at the same time completely or predominantly made from renewable raw materials can.
  • a barrier paper (10) comprising a) a paper substrate (11) comprising a front side and a rear side opposite the front side, and b) a barrier layer (12) arranged on the front side and / or back side of the paper substrate the barrier layer (12) comprises or consists of a polymeric binder and a wax based on a vegetable oil.
  • barrier papers of the invention have a high resistance to fats and / or oils and / or moisture and thereby wholly or predominantly from renewable raw materials can be produced.
  • the barrier layer is formed so that it does not detach from the paper substrate or that the wax is transferred to other articles or the food.
  • a wax based on a vegetable oil is understood in the context of this invention, a wax that is obtained by chemical modification of a vegetable oil.
  • the chemical modification may be, for example, a partial or complete hydrogenation with a metallic catalyst, for example nickel, and hydrogen, all or part of the double bonds of the oil being hydrogenated to single bonds.
  • the waxes are not liquid at 20 ° C but solid. The chemical modification of the vegetable oil thus causes a melting point increase.
  • a vegetable oil is meant a fatty acid triglyceride derived from plants or parts of plants.
  • the extraction of the oil is usually carried out by pressing, extraction or refining of the oils from the plants or parts of plants.
  • the extraction of the oils is known to the skilled person.
  • plant seeds are used for oil production, they are referred to as oilseeds.
  • the oil occurs in the form of lipids, which represent its cell membrane and energy reserves.
  • non-drying for example olive oil
  • semi-drying for example soybean or rapeseed oil
  • drying oils for example linseed or poppy seed oil.
  • drying does not denote evaporation, but the solidification of the oil due to oxidation and polymerization of the unsaturated fatty acids.
  • semidrying and drying oils as starting material for the preparation of the waxes used according to the invention is preferred.
  • Possible sources of vegetable oil are agai oil, algae oil, argan oil (from the fruits of the argan tree), avocado oil (from avocado avocado flesh), babagu oil, cottonseed oil (from the cotton plant seeds), borage oil or borage seed oil (from the borage seed plant), cupuagu butter, cashew peel oil, thistle oil (also called “safflower oil", from the seeds of safflower or Carthamus), peanut oil (from the fruit of the peanut plant), hazelnut oil (from the hazelnuts of the hazelnut bush), hemp oil (from the Seeds of the jasmin), jatropha oil (from the seed of the Jatropha curcas), jojoba oil (actually a liquid wax, from the seeds of the jojoba shrub), camellia oil (from the seeds of Camellia oleifera, Camellia sinensis or Camellia japonica, cocoa butter, coconut oil (from coconut seed, coconut palm tree fruit), pumpkin seed oil (also known as seed oil, from the seeds of the
  • a barrier paper is preferred, wherein the wax based on a vegetable oil is an oil-based wax selected from the list comprising palm oil, coconut oil, poppy oil, olive oil, linseed oil, soybean oil, sunflower oil, thistle oil and rapeseed oil,
  • the wax based on a vegetable oil is a wax based on a soybean oil, d. H. soybean oil wax or soy wax.
  • the waxes produced from these oils are characterized by high resistance and can be produced with high melting points.
  • the waxes used according to the invention namely palm oil wax, coconut oil wax, poppy oil wax, olive oil wax, linseed oil wax, soybean oil wax, Sunflower oil wax, thistle oil wax and rapeseed oil wax, when used in barrier papers according to the invention, show a significant increase in the resistance to fats and / or oils and / or moisture.
  • the use of soybean oil wax is preferred according to the invention.
  • Our own investigations have shown that the use of soybean oil wax in addition to the resistance to grease, oil and moisture and very low water vapor permeability can be obtained.
  • the soybean oil wax also has the advantage that it can be produced tasteless and odorless.
  • the mass fraction of the wax based on a vegetable oil in the barrier layer being from 6 to 98%, preferably from 20 to 90%, particularly preferably from 50 to 89%, very particularly preferably from 50 to 78% on the total mass of the barrier layer.
  • Our own investigations have surprisingly shown that with a mass fraction of the wax based on a vegetable oil of less than 6%, the barrier properties to fat, oil and moisture disproportionately strong decrease while at a mass fraction of the wax based on a vegetable oil of more than 98%, although excellent barrier properties
  • the mechanical durability of the barrier layer decreases disproportionately.
  • the polymeric binder is a crosslinked or uncrosslinked 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, a-isodecyl-io-hydroxy poly (oxy-) 1, 2-ethanediyl), styrene-butadiene latex, styrene-acrylate polymers, acrylic copolymers and mixtures thereof.
  • a crosslinked or uncrosslinked binder selected from the group consisting of starch, polyvinyl alcohol, carboxyl group-modified polyvinyl alcohol, ethylene-vinyl alcohol copolymer ,
  • barrier papers of the invention have a particularly high resistance to grease, oil and moisture, when the polymeric binder is one or more styrene-acrylate polymers or the binder comprises these.
  • the barrier layer does not comprise ethylene.
  • the mass fraction of the polymeric binder in the barrier layer is 94 to 2%, preferably 80 to 10%, particularly 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 even more 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 even more preferred if the mass fraction of the polymeric binder in the barrier layer is 50 to 1 1% and the weight fraction of the wax in the barrier layer is 50 to 89%.
  • barrier papers with the low surface-related masses given here have very good resistance to grease, oil and moisture. Although the resistance can be improved slightly by increasing the basis weight, the improvement is minimal, so that the increased material consumption does not justify the small improvement.
  • With a basis weight of less than 1.5 g / m 2 the durability of the pure carrier substrate is likewise improved, although the resistance is not always sufficient for some areas of application (eg very fatty and moist foods).
  • Our own investigations have shown that optimum resistance can be obtained when the basis weight of the barrier layer is in the range of 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 is understood to mean a binder which contains a plurality of negative charges which are stabilized by cations (eg metal cations or ammonium).
  • a polymeric binder is understood to mean a binder which has been built up by polycondensation from a large number of molecules and in which one or more types of atoms or atomic groups (so-called repeat units) are repeatedly arranged next to one another and the number of repeating units per molecule is more than 25. It is inventively preferred if the determined by differential scanning calorimetry (DSC) glass transition temperature of the anionic binder is less than or equal to 120 ° C.
  • DSC differential scanning calorimetry
  • anionic binder is a copolymer.
  • Suitable anionic binders 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 ester (preferably methyl or ethyl ester), copolymers of Polymethacrylic acid esters (preferably methyl or ethyl esters) or polyacrylamides or copolymers thereof.
  • an aqueous solution or dispersion of the anionic binder has a basic pH, provided it is dissolved or dispersed in water at 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 can be determined by conventional means.
  • the barrier layer (12) additionally comprises a wax based on saturated hydrocarbons.
  • Barrier papers are preferred according to the invention, the wax having a melting point above 40 ° C., preferably above 50 ° C., particularly preferably above 60 ° C., based on saturated hydrocarbons.
  • Barrier papers are preferred according to the invention, wherein the wax based on saturated hydrocarbons contains one, two, three or more than three alkanes or consists of the group consisting of heneicosane, docosan, tricosane, tetracosane, pentacosane, hexacosane, heptacosane, octacosane, nonacosane , Triacontan, Hentriacontan, Dotriacontan, Tritriacontan, Tetratriacontan, Pentatriacontan, Hexatriacontan, Heptatria-contan, Octatriacontan and Nonatriacontan, preferably selected from the group consisting of hexacosan, heptacosan, octacosan, nonacosan and triacontane.
  • Barrier papers are particularly preferred according to the invention
  • the acrylate copolymer in the barrier layer is a copolymer having 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 to 100,000 g / mol.
  • the mean molar mass is determined with the aid of gel permeation chromatography (GPC) using tetrahydrofuran (THF; tetramethylene oxide, 1,4-epoxybutane, oxacyclopentane) as solvent, polystyrene as standard and detection using 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.
  • the properties of the resulting acrylate copolymer can be optimized.
  • our own investigations have shown that an acrylate copolymer prepared from methyl acrylate, methyl methacrylate, butyl acrylate, butyl acrylate, 2-ethylhexyl acrylate, 2-ethylhexyl methacrylate and / or styrene has particularly good barrier properties.
  • methyl acrylate methyl methacrylate, butyl acrylate, butyl acrylate, 2-ethylhexyl acrylate, 2-ethylhexyl methacrylate and styrene
  • further monomers for preparing the acrylate copolymer or the copolymer was 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 particularly preferably a random copolymer.
  • a barrier paper comprising a) a paper substrate (11) having a front side and a rear side opposite the front side, and b) a barrier layer (12) arranged on the front side and / or rear side of the paper substrate, consisting of or comprising i ) an acrylate copolymer having an average molar mass in the range of
  • acrylate copolymer was prepared from two, three, four, five, six or seven monomers selected from the group consisting of methyl acrylate, methyl methacrylate, Butyl acrylate, butyl methacrylate, 2-ethylhexyl acrylate, 2-ethylhexyl methacrylate and styrene, and ii) a saturated hydrocarbon based wax, wherein the saturated hydrocarbon wax is preferably octacosane or wherein the wax is based on saturated hydrocarbons preferably comprises octacosane and iii) a wax based on a vegetable oil.
  • a barrier paper is preferred according to the invention, wherein the mass ratio between the polymeric binder and the wax based on saturated hydrocarbons 999: 1 to 70: 30, preferably 99: 1 to 80: 20, more preferably 95: 5 to 85: 15.
  • a barrier paper is preferred according to the invention, wherein the barrier paper additionally contains an intermediate layer (13) and the intermediate layer (13) is arranged between the paper substrate and the barrier layer. It has been shown in our own investigations that the properties of the resulting barrier paper are particularly good if the barrier layer is not applied directly to the base paper as a paper substrate, but first an intermediate layer is applied to the paper substrate. In this case, it is preferred according to the invention if the intermediate layer (13) contains a pigment.
  • a barrier paper is preferred according to the invention if the pigment is an organic pigment, inorganic pigments or a mixture of organic pigments and inorganic pigments.
  • a barrier paper according to the invention is preferred when the pigment is an inorganic pigment selected from the list consisting of calcined kaolin, kaolin, kaolinite, magnesium silicate hydrate, silica, bentonite, calcium carbonate, aluminum hydroxide, alumina and boehmite.
  • Our own investigations have shown that particularly good properties can be obtained if the pigment is formed in a platelet-shaped, preferably with an aspect ratio of 5 to 100, preferably from 15 to 100, more preferably from 20 to 80.
  • the aspect ratio is the Ratios between the diameter and the thickness of the platelet of the pigment before mixing with the other components.
  • An aspect ratio of 20 means that the diameter of the plate is 20 times larger than the thickness of the plate.
  • kaolin, kaolinite and talc are platelet-shaped and are therefore particularly preferred as the pigment.
  • a barrier paper is preferred according to the invention if the intermediate layer comprises a binder, and the binder is preferably a crosslinked or non-crosslinked binder selected from the group consisting of starch, polyvinyl alcohol, carboxyl group-modified polyvinyl alcohol, ethylene-vinyl alcohol copoly 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, a-isodecyl and hydroxy-poly (oxy-1,2-ethanediyl), styrene-butadiene latex, styrene-acrylate polymers, film-forming acrylic copolymers, and mixtures thereof.
  • the binder is preferably a crosslinked or non-crosslinked binder selected from the group consisting
  • a barrier paper is preferred according to the invention if the binder comprises or consists of one or more acrylate copolymers and / or styrene-acrylate polymers.
  • a barrier paper is preferred according to the invention if the mass fraction of the binder in the intermediate layer is 95 to 40%, preferably 85 to 60%, particularly preferably 80 to 60%, based on the total mass of the intermediate layer.
  • Barrier papers are preferred according to the invention, the basis weight of the intermediate layer being in the range from 1.5 to 6 g / m, preferably in the range from 2.0 to 5.5 g / m 2 , particularly preferably in the range from 2.0 to 4.8 g / m 2 .
  • barrier papers are preferred, the paper substrate having a short ser pulp having a Schopper-Riegler grade of at least 30 ° SR and a long fiber pulp having a Schopper-Riegler grade of at least 25 ° SR, and wherein the paper substrate has at least a mass fraction of 50% I Istoff includes, based on the total mass of Krzfase r Ze I Istoff and long-fiber pulp.
  • the short fiber pulp has a Schopper-Riegler degree of at least 35 ° SR, preferably of at least 39 ° SR, and / or the long fiber pulp has a Schopper-Riegler grade of at least 30 ° SR, preferably of at least 33 ° SR.
  • the paper substrate comprises a mass fraction of at least 70% short fiber pulp, preferably between 70 and 75% short fiber pulp, based on the total mass of short fiber pulp and long fiber pulp.
  • the barrier paper has on one or both sides a Bekk smoothness determined in accordance with ISO 5627 in the range from 100 to 1200 s. It is preferred if the barrier layer has a Bekk smoothness in the range of 100 to 1200 s, provided that the barrier layer is an outer layer. In contrast to ISO 5627, the Bekk smoothness in this case is not determined on both sides of the barrier paper, but only on the barrier layer of the barrier paper.
  • a barrier paper is preferred according to the invention if the barrier paper has a water vapor permeability according 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), particularly preferably less than or equal to 150 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 water vapor permeability in packaging is desirable in foods, as the packaged food does not dry out prematurely and remain fresh for longer.
  • barrier paper is preferred according to the invention if the barrier paper has a KIT value of at least 5, preferably of at least 8, more preferably of at least 12; measured by method Tappi 559. Own investigations have shown that barrier papers according to the invention have a KIT value of over 12 and thus have an excellent bed stability, which is in the same range as the fat resistance of barrier papers which are coated with plastic or aluminum foil.
  • a barrier paper is preferred according to the invention if the barrier paper has a fat permeability with Tappi 454 turpentine oil of at least 1300 s, preferably of at least 1500 s, more 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 method DIN 53116.
  • a barrier paper is preferred if the basis weight of the barrier paper is in the range from 30 to 120 g / m, preferably in the range from 35 to 80 g / m 2 , particularly preferably in the range from 40 to 50 g / m 2 lies.
  • the basis weight of the resulting barrier paper is higher than 120 g / m 2.
  • the basis weight is in the range of 120 g / m 2 to 600 g / m 2 and Case of cardboard over 600 g / m 2 .
  • a barrier paper is preferred according to the invention if the wax based on a vegetable oil and the polymeric binder are homogeneously distributed in the barrier layer. It is not necessarily necessary in the meantime for the wax and the polymeric binder to be mixed thoroughly, but local concentration differences can occur that result in production-specific reasons from the use of small wax particles. According to the invention, however, the wax is not encapsulated, d. H. it has no core-shell structure.
  • a barrier paper is preferred for use as wrapping paper, underlay paper, intermediate and / or release paper for foods, preferably for packaging baked goods, sandwiches, bread, burgers, meat products, fish, sausages and / or cheese.
  • the paper substrate coated both front side and back with the barrier layer, wherein preferably between the barrier layers and the paper substrate each an intermediate layer is arranged.
  • the barrier papers according to the invention not only have excellent resistance to fats and / or oils and / or moisture, but also a barrier or Possess blocking effect against mineral oils.
  • Mineral oils are often found in recycled paper or cardboard that is not intended for direct food packaging. However, if these come in contact with food, for example, when food is shipped in a carton, it can not be ruled out that mineral oils pass on to the food, even if the food is packed in a separate packaging.
  • mineral oil residues in chocolate have been found in advent calendars that have been absorbed by the chocolate's contact with the cardboard packaging.
  • Barrier papers according to the invention are surprisingly distinguished by the fact that they not only prevent the escape of fats, oils and moisture from the food to the outside, but additionally protect the food packaged therewith from contamination with mineral oils.
  • barrier paper according to the invention As wrapping paper, Unterleg paper, paper for inner bag packaging, intermediate and / or release paper for food, preferably for wrapping, inlaying, interposing and / or separating baked goods, fried and / or fried goods, snack goods, sandwiches, bread, burgers, meat products, fish products, charcuterie and / or cheese.
  • Another aspect of the present invention relates to the use of a barrier paper according to the invention for packaging food, preferably for packaging fatty foods, wherein the barrier paper is the fat of the food rejects.
  • a further aspect of the present invention relates to a method for producing a barrier paper, preferably a barrier paper according to the invention, comprising the following steps (i) producing or providing a paper substrate
  • the wax emulsion is a wax-in-oil emulsion and the wax emulsion additionally contains an anionic polymeric binder which is preferably suitable for stabilizing the wax emulsion.
  • the prepared or prepared barrier screed contains, in addition to the wax emulsion, a (further) polymeric binder.
  • 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 by laser diffraction particle size analysis. Our own investigations have shown that particles of this size lead to barrier layers with very good barrier and mechanical properties, since there is good mixing between polymeric binder and wax particles.
  • a coated paper substrate is used as the paper substrate, or a coating of a line is effected on one side of the paper substrate and subsequent drying of the line, so that an intermediate layer results before the barrier coat is applied.
  • the method according to the invention thus preferably additionally comprises the following steps: a) producing or providing a line comprising pigments and binders b) applying the prepared or provided line to one side of the paper substrate and then drying the line so that an intermediate layer results, the steps a) and b) are preferably carried out between steps i) and ii).
  • Another aspect of the present invention relates to a barrier paper produced by a method according to the invention.
  • Another aspect of the present invention relates to the use of a wax based on a vegetable oil for the production of a paper coating, preferably for the production of a barrier layer of a barrier paper.
  • FIG. 1 shows a barrier paper 10 consisting of a paper substrate 11 and a barrier layer 12.
  • the paper substrate has a front side and a rear side opposite to the front side, and on the front side of the paper substrate 11 is disposed a barrier layer 12 consisting of a polymeric binder and a vegetable oil-based wax.
  • FIG. 2 shows a barrier paper 10 which consists of a paper substrate 11, an intermediate layer 13 and a barrier layer 12.
  • the paper substrate has a front side and a rear side opposite to the front side, and on the front side of the paper substrate 11, the intermediate layer 13 is arranged.
  • the barrier layer 12 is arranged, which consists of a polymeric binder and a wax based on a vegetable oil.
  • the intermediate layer 13 contains a pigment and a binder.
  • Fig. 3 shows a barrier paper 10, which consists of a paper substrate 1 1 and two barrier layers 12.
  • the paper substrate has a front side and a rear side opposite to the front side, and a barrier layer 12 consisting of a polymeric binder and a vegetable oil-based wax is arranged on both the front side and the rear side of the paper substrate 11.
  • FIG. 4 shows a barrier paper 10 which consists of a paper substrate 11, two intermediate layers 13 and two barrier layers 12.
  • the paper substrate has a front side and a rear side opposite the front side, and an intermediate layer 13 is arranged both on the front side and on the rear side of the paper substrate 11.
  • a respective barrier layer 12 is arranged, which consists of a polymeric binder and a wax based on a vegetable oil.
  • the intermediate layers contain a pigment and a binder.
  • short fiber pulp (100% short fiber pulp) with a refining of 50 ° SR and an addition of talcum filler at 1% by weight, based on the total weight of the paper substrate, was resin-sizing on a paper machine Paper web produced with a basis weight of 33.3 g / m 2 .
  • the prepared paper substrate was calendered at a line load of 100kN / m and a temperature of 100 ° C.
  • a curtain coater was precoated with a precoat comprising water, an aqueous dispersion of an acrylate-acetate copolymer (solids content 33%, mass fraction in the pre-coat 0.03% (otro), Sterocoll BL), an aqueous dispersion of an acrylic copolymer ( Solids content 40%, mass fraction in precursor 1, 27% (otro), trade name: Sterocoll FS), an aqueous dispersion of a styrene-acrylate copolymer (solids content 50%, mass fraction in precoat 70.5% (otro); trade name: Sterocoll FS ), and kaolin (solids content 70%, mass fraction in the precursor 28.2% (otro), trade name: Capim NP), applied at a coating weight of 3.5 g / m 2 and the precoat was then dried by IR and air drying, so an intermediate layer resulted.
  • a precoat comprising water, an aqueous dispersion of an acrylate-acetate copolymer
  • a curtain coater was coated on the intermediate layer with a barrier screed comprising water, a wax based on a vegetable oil (solids content 30%, mass fraction in the pre-coat 82% (otro), trade name: SWX 155), a polyacrylate dispersion (solids content 48%). , Mass fraction in precursor 16.4% (otro), trade name: Tecryl PB 16/3), and a mixture of nonionic surfactants (solids content 100%, mass fraction in precursor 1, 6% (otro), trade name: Metolat 700), applied at a coating weight of 4 g / m 2 and the barrier screed was then dried by means of IR and air drying, so that a barrier layer resulted.
  • a barrier screed comprising water, a wax based on a vegetable oil (solids content 30%, mass fraction in the pre-coat 82% (otro), trade name: SWX 155), a polyacrylate dispersion (solids content 48%).
  • Mass fraction in precursor 16.4% (otro) trade name: Tecryl PB 16/3
  • the barrier paper according to the invention has excellent grease resistance and a low water vapor permeability.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Paper (AREA)
  • Wrappers (AREA)

Abstract

La présente invention concerne un papier barrière (10) comprenant a) un substrat de papier (11) présentant un recto et un verso opposé au recto et b) une couche barrière (12) disposée sur le verso du substrat de papier, cette couche barrière (12) comprenant un liant polymère et une cire à base d'une huile végétale ou étant constituée de ces substances. L'invention concerne en outre l'utilisation d'un papier barrière selon l'invention comme papier d'emballage, papier de support, papier pour sachets intérieurs d'emballage, papier intermédiaire et/ou papier séparateur à usage alimentaire. L'invention concerne également un procédé de fabrication d'un papier barrière.
EP18826302.4A 2017-12-22 2018-12-18 Papier barrière recyclable Pending EP3728735A1 (fr)

Applications Claiming Priority (2)

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

Publications (1)

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EP3728735A1 true EP3728735A1 (fr) 2020-10-28

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EP18826302.4A Pending EP3728735A1 (fr) 2017-12-22 2018-12-18 Papier barrière recyclable

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US (1) US20200370244A1 (fr)
EP (1) EP3728735A1 (fr)
JP (1) JP2021507125A (fr)
CN (1) CN111511987A (fr)
DE (1) DE102017131277A1 (fr)
WO (1) WO2019121733A1 (fr)

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WO2019121733A1 (fr) 2017-12-22 2019-06-27 Mitsubishi Hitec Paper Europe Gmbh Papier barrière recyclable

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WO2019121733A1 (fr) 2017-12-22 2019-06-27 Mitsubishi Hitec Paper Europe Gmbh Papier barrière recyclable

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WO2019121733A1 (fr) 2019-06-27
CN111511987A (zh) 2020-08-07
JP2021507125A (ja) 2021-02-22
US20200370244A1 (en) 2020-11-26
DE102017131277A1 (de) 2019-06-27

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