WO2023198889A1 - Papier barrière - Google Patents

Papier barrière Download PDF

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Publication number
WO2023198889A1
WO2023198889A1 PCT/EP2023/059786 EP2023059786W WO2023198889A1 WO 2023198889 A1 WO2023198889 A1 WO 2023198889A1 EP 2023059786 W EP2023059786 W EP 2023059786W WO 2023198889 A1 WO2023198889 A1 WO 2023198889A1
Authority
WO
WIPO (PCT)
Prior art keywords
barrier
barrier paper
coating
paper according
water
Prior art date
Application number
PCT/EP2023/059786
Other languages
German (de)
English (en)
Inventor
Andrew VOGT
Markus WILDBERGER
Dominik HOFERER
Aljoscha FÖLL
Original Assignee
Koehler Innovation & Technology 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 Koehler Innovation & Technology Gmbh filed Critical Koehler Innovation & Technology Gmbh
Publication of WO2023198889A1 publication Critical patent/WO2023198889A1/fr

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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
    • D21H27/00—Special paper not otherwise provided for, e.g. made by multi-step processes
    • D21H27/10—Packing paper
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D65/00—Wrappers or flexible covers; Packaging materials of special type or form
    • B65D65/38—Packaging materials of special type or form
    • B65D65/42—Applications of coated or impregnated materials
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D75/00—Packages comprising articles or materials partially or wholly enclosed in strips, sheets, blanks, tubes, or webs of flexible sheet material, e.g. in folded wrappers
    • B65D75/008—Standing pouches, i.e. "Standbeutel"
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D75/00—Packages comprising articles or materials partially or wholly enclosed in strips, sheets, blanks, tubes, or webs of flexible sheet material, e.g. in folded wrappers
    • B65D75/04—Articles or materials wholly enclosed in single sheets or wrapper blanks
    • B65D75/06—Articles or materials wholly enclosed in single sheets or wrapper blanks in sheets or blanks initially folded to form tubes
    • B65D75/12—Articles or materials wholly enclosed in single sheets or wrapper blanks in sheets or blanks initially folded to form tubes with the ends of the tube closed by flattening and heat-sealing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D75/00—Packages comprising articles or materials partially or wholly enclosed in strips, sheets, blanks, tubes, or webs of flexible sheet material, e.g. in folded wrappers
    • B65D75/04—Articles or materials wholly enclosed in single sheets or wrapper blanks
    • B65D75/20—Articles or materials wholly enclosed in single sheets or wrapper blanks in sheets or blanks doubled around contents and having their opposed free margins united, e.g. by pressure-sensitive adhesive, crimping, heat-sealing, or welding
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D75/00—Packages comprising articles or materials partially or wholly enclosed in strips, sheets, blanks, tubes, or webs of flexible sheet material, e.g. in folded wrappers
    • B65D75/26—Articles or materials wholly enclosed in laminated sheets or wrapper blanks
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D75/00—Packages comprising articles or materials partially or wholly enclosed in strips, sheets, blanks, tubes, or webs of flexible sheet material, e.g. in folded wrappers
    • B65D75/28—Articles or materials wholly enclosed in composite wrappers, i.e. wrappers formed by associating or interconnecting two or more sheets or blanks
    • B65D75/30—Articles or materials enclosed between two opposed sheets or blanks having their margins united, e.g. by pressure-sensitive adhesive, crimping, heat-sealing, or welding
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D75/00—Packages comprising articles or materials partially or wholly enclosed in strips, sheets, blanks, tubes, or webs of flexible sheet material, e.g. in folded wrappers
    • B65D75/40—Packages formed by enclosing successive articles, or increments of material, in webs, e.g. folded or tubular webs, or by subdividing tubes filled with liquid, semi-liquid, or plastic materials
    • B65D75/44—Individual packages cut from webs or tubes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D75/00—Packages comprising articles or materials partially or wholly enclosed in strips, sheets, blanks, tubes, or webs of flexible sheet material, e.g. in folded wrappers
    • B65D75/52—Details
    • B65D75/58—Opening or contents-removing devices added or incorporated during package manufacture
    • B65D75/5861—Spouts
    • B65D75/5872—Non-integral spouts
    • B65D75/5883—Non-integral spouts connected to the package at the sealed junction of two package walls
    • 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
    • D21H19/84—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
    • D21H21/00—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties
    • D21H21/14—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties characterised by function or properties in or on the paper
    • D21H21/16—Sizing or water-repelling agents

Definitions

  • the present invention relates to a barrier paper, a method for producing such a barrier paper, the use of the barrier paper as a packaging material and a packaging comprising the barrier paper.
  • Packaging generally refers to the shell or (partial or complete) wrapping of an object, particularly for its protection or better handling. Accordingly, a packaging material includes the material constituting such a packaging.
  • Packaging materials can, for example, be based on paper, plastics and/or metals.
  • the present invention deals with paper-based packaging materials.
  • packaging materials of any origin are to protect the packaged goods from external influences and to prevent the packaged goods from escaping.
  • the packaging material should meet different criteria depending on the packaged goods and the packaging process.
  • suitable packaging materials should also meet mechanical and process-specific requirements.
  • a packaging material should have sufficient tear strength, a suitable coefficient of friction (coefficient of friction), and flexibility; it should either be sealable, in particular heat-sealable and ultrasonically sealable, or compatible with a cold-seal adhesive, as well as printable from the outside and should not be used in the entire conversion and packaging process lose its protective effect.
  • paper can meet many mechanical requirements, but due to its physical properties and porous structure, it requires an additional coating that provides it with heat sealability or barriers, for example.
  • Known paper-based, coated packaging materials often contain compounds such as polyvinylidene chloride (halogen-containing), or are composites of paper and plastic films, have improved tear resistance, which can lead to running problems on packaging systems, and/or are more optical due to too high a coating content or adhesive components
  • halogen-containing polyvinylidene chloride
  • Inhomogeneities or formation of so-called adhesive impurities (stickies) via the paper fiber stream are often not recyclable and/or are not sufficiently kink-resistant due to their metal surface coating and/or are not effective in humid climates due to their respective polymer.
  • coatings via vacuum deposition generally require a particularly smooth and chemically suitable surface, which is usually created with a primer.
  • Polyvinyl alcohols are widely known as linear water-soluble, biodegradable barrier coatings, including for paper. Such coatings have good barriers against oil, grease, oxygen, solvents and other non-polar gases, liquids or solids. However, due to their hydrophilicity, polyvinyl alcohols have very high permeabilities for polar compounds, such as water. This can also influence the barrier effect against non-polar migrants, as polyvinyl alcohols absorb moisture very well, swell and thus create pathways at the molecular level through the barrier coating.
  • Polyvinyl alcohol is understood to mean a completely saponified polyvinyl acetate, which is a (thermoplastic) plastic of the following formula (I), which is generally synthesized by means of free-radical polymerization of vinyl acetate.
  • ester groups in polyvinyl acetate are relatively easy to saponify with alkali, which converts the polymer into polyvinyl alcohol and thereby makes it hydrophilic and water-sensitive.
  • a partially saponified polyvinyl acetate is also called partially saponified polyvinyl alcohol.
  • partially saponified polyvinyl acetate can be used synonymously with the term partially saponified polyvinyl alcohol.
  • the degree of saponification indicates the proportion of ester groups that have been saponified and are now present as -OH groups.
  • a polyvinyl alcohol with a degree of saponification of 90% is a vinyl acetate polymer in which 90% of the originally present ester groups have been saponified. This polyvinyl alcohol therefore contains 90% OH groups and 10% ester groups. With a degree of saponification of 100%, only OH groups are present, since all of the ester groups that were originally present have been saponified.
  • copolymer refers to all polymers that contain a predominant proportion (>50%) Vinyl alcohol or vinyl acetate units exist regardless of the number of different monomers used for the synthesis.
  • Such polyvinyl alcohol copolymers preferably include polyethylene vinyl alcohols.
  • saponification means the hydrolysis of an ester by the aqueous solution of a hydroxide, such as. B. by sodium hydroxide, or by special enzymes (esterases).
  • a hydroxide such as. B. by sodium hydroxide
  • esterases special enzymes
  • they are irreversible because the carboxylic acid lacks the proton necessary for esterification.
  • the products of the reaction are the alcohol and the salt of the acid (carboxylation) that made up the ester.
  • any hydrolysis of an ester can be referred to as saponification.
  • metallized barrier papers are already known, for example from the document WO 2021/023661 Al, which have a low water vapor permeability (WVTR) of less than 5 g/m 2 /d at 38 ° C and at 90% relative humidity.
  • WVTR water vapor permeability
  • a paper substrate for metal vapor deposition comprising a base paper and, on the base paper, a layer containing a polyvinyl alcohol resin, is known.
  • the paper substrate preferably comprises a further layer which contains a water vapor barrier resin as a filling layer, this layer preferably containing a flat pigment.
  • a water vapor barrier resin as a filling layer
  • the metal vapor deposition layer include aluminum, tin, nickel, copper, gold, platinum, silver, cobalt, chromium and the like, aluminum is preferred because of its high light-shielding property and low cost.
  • WO 2021/260043 Al also describes metallizable barrier papers.
  • the object of the present invention is to eliminate the disadvantages of the known materials and to provide a material that is suitable as a packaging material, in particular for moisture and oxidation-sensitive and fatty foods, and for the production of packaging, such as tubular bags, using hot or cold sealing processes can.
  • the material should not have barrier layers based on halogen Compounds included.
  • the material according to the invention should have one or more of the following properties compared to known packaging materials:
  • Improved oxygen barrier, improved grease barrier, improved mineral oil barrier, improved kink resistance and flexibility of the barrier papers (equivalent to no or minimal loss of barrier properties due to kinks or folds of the barrier papers or packaging made from them), recyclability via the waste paper cycle, improved heat sealing properties, improved cold sealing properties (compatible with the sealing medium, such as a water-based cold seal adhesive), high tear resistance, the taste of the packaging contents is not changed, has aroma impermeability, the outside and inside should be printable.
  • the material should also have an improved water vapor barrier and the sealing seam should be as moisture-resistant as possible. Ultimately, the material should be as economical to produce as possible.
  • barrier papers according to the invention significantly improves their application properties. Especially as more environmentally friendly and sustainable replacement for plastic packaging for consumer goods and food, at least equivalent properties could now be achieved while maintaining the excellent recycling properties of paper packaging, especially in waste paper cycles.
  • the coating layer S1 its properties are of particular importance, both for the subsequent barrier layer B1 and for the properties of the barrier paper as a flexible packaging material.
  • barrier papers according to the invention can be used without any problems in conventional packaging machines for plastic packaging and that conventional packaging, such as heat-sealed tubular bags for sensitive foods such as chips and chocolate or inner liners for tobacco products welded using ultrasound, can be formed and sealed tightly enough.
  • a barrier paper is preferred, the coating layer S1 having at least one of the following properties: a) water vapor barrier b) oxygen barrier, c) mineral oil barrier, d) grease barrier e) aroma barrier, f) kink resistance, at least one property g) grease resistance, h) sealability, i ) Bekk smoothness of at least 200 Bekk seconds.
  • the grease resistance of a barrier paper according to the invention has in particular at least one of the following values listed under a) to f) (number of passages with a diameter ⁇ 1 mm / number of passages with a diameter > 1 mm): a) Display paper (AP ): ⁇ 5 / ⁇ 5, preferably ⁇ 2 / ⁇ 2, in particular 0 / 0 b) Sample paper (PP): ⁇ 5 / ⁇ 5, preferably ⁇ 2 / ⁇ 2, in particular 0 / 0 c) Display paper (AP) - inner crease: ⁇ 5 / ⁇ 5, preferably ⁇ 2 / ⁇ 2, in particular 0 / 0 d) sample paper (PP) - inner crease: ⁇ 5 / ⁇ 5, preferably ⁇ 2 / ⁇ 2, in particular 0 / 0 e) Display paper (AP) - external bend: ⁇ 5 / ⁇ 5, preferably ⁇ 2 / ⁇ 2, in particular 0 / 0 e
  • Palm kernel fat test Analogous to DIN 53116. For kinked samples, a
  • a bend of 180° is created with a roller that exerts a load of 330 g/cm on the resulting bend and where the coating can be on the inside (inside bend) or outside (outside bend).
  • Display paper Evaluation of the display paper mentioned in DIN 53116. Grease penetration points with a diameter (d) of ⁇ 1 mm (first value in the table) and of > 1 mm (second value in the table) are counted.
  • sample paper This is not part of the standard, but was carried out for better differentiation.
  • the coating layer S1 comprises or consists of at least one water-soluble polymer and/or a water-dispersible polymer.
  • a barrier paper is preferred, with at least one water-soluble
  • Polymer and/or the at least one water-dispersible polymer is selected from the group: a) polyvinyl alcohol, in particular partially saponified or fully saponified; b) polyvinyl alcohol copolymer, in particular copolymerized with ethylene, polyvinylamine, acrylic acid derivatives, partially saponified or fully saponified; c) Modified fully or partially saponified polyvinyl alcohols or copolymers, in particular modifications with acyl, alkyl, acrylamide, silanol, diacetone, acetoacetyl, itaconic acid; d) polymer with an onset temperature determined by DSC of less than 210 ° C; e) Acrylic-based polymers; f) polyester-based polymers; g) Nitrocellulose-based polymers; h) Polyvinyl acetate-based polymers.
  • the onset temperature is determined using DSC according to DIN EN ISO 11357-1:2010-03 as the intersection of the extrapolated baseline and the turning tangent at the beginning of the melting or crystallization peak.
  • the barrier layer B1 can be applied directly to the coating layer, for example without an intermediate layer, without adhesion promoters or pretreatment of the coating layer, for example by means of corona or plasma treatment.
  • a primer can be dispensed with and a barrier layer B1, in particular a metallization, can still be applied easily and reliably.
  • a barrier paper is preferred, wherein the at least one water-soluble polymer and/or the at least one water-dispersible polymer comprises an at least partially saponified polyvinyl alcohol and/or an at least partially saponified polyvinyl alcohol copolymer, each with an onset temperature of less than 210° C., determined by DSC .
  • a barrier paper is preferred, wherein the at least one water-soluble polymer and/or the at least one water-dispersible polymer is a partially saponified polyvinyl alcohol with a degree of saponification of 30% to 95%, an average molecular weight of greater than 0 and less than 100,000 g/mol and with a value determined by DSC Onset temperature of less than 200°C.
  • a barrier paper is preferred, wherein the at least one water-soluble polymer and/or the at least one water-dispersible polymer is a partially saponified polyvinyl alcohol with a degree of saponification of greater than 95% to 100%, an average molecular weight of greater than 70,000 g/mol and with an onset determined by DSC -Temperature of less than 200°C.
  • a barrier paper is preferred, wherein the at least one polymer is a partially saponified polyvinyl alcohol copolymer, preferably a partially saponified polyethylene vinyl alcohol, with a degree of saponification of 95% to 100%, an average molecular weight of greater than 60,000 g / mol and with an onset temperature determined by DSC less than 210°C.
  • the at least one polymer is a partially saponified polyvinyl alcohol copolymer, preferably a partially saponified polyethylene vinyl alcohol, with a degree of saponification of 95% to 100%, an average molecular weight of greater than 60,000 g / mol and with an onset temperature determined by DSC less than 210°C.
  • a barrier paper is preferred, the partially saponified polyvinyl alcohol and/or the partially saponified polyvinyl alcohol copolymer having a viscosity of less than 30 mPas, particularly preferably less than 20 mPas and very particularly preferably less than 15 mPas, at a dry content of 4%.
  • a barrier paper is preferred, wherein the at least one polymer comprises a mixture of water-soluble polymers and/or water-dispersible polymers previously mentioned as preferred.
  • a barrier paper is preferred, with the coating layer S1 having a surface tension in the range from 25 to 80 mN/m, in particular 25 to 75 mN/m. Particularly preferred ranges are 45 to 70 mN/m.
  • the polar portion of the surface tension is preferably in the range from 55 to 80%.
  • polyvinyl alcohols are suitable polymers for the coating color layer SI, in particular thin metal layers which have a significantly lower and predominantly disperse surface tension. For example, we determined a surface tension of 27.6 mN/m with a polar content of only 3.6% for a coating layer S1 based on polyvinyl alcohol that was vaporized with AI using physical vapor deposition. Pure aluminum has a very high surface tension of 1200 mN/m. In reality, aluminum is covered with an oxide layer, resulting in a surface tension of approx. 40 mN/m.
  • the metal layer (barrier layer B1) not only adheres via weak forces as on the mostly non-polar plastics (polyolefins, polyesters, acrylic copolymers, etc.), but is more firmly anchored, which results in a high bond strength, which also proves to be an advantage when the barrier paper buckles , since the metal layer (barrier layer Bl) does not come off when bending, even with the more demanding external bend.
  • water-soluble, and therefore polar, polymers that have a certain oxygen barrier and are particularly suitable for the coating layer S1 but also for the coating B2.
  • These include native and modified starches, partially degraded starches, modified soluble celluloses, nanocelluloses and other polymeric carbohydrates such as chitosan, pullulan, curdlan, xanthan gum, hemicelluloses, pectins, dextran, gum arabic, karaya, guar gum, gellan gum, etc.
  • carbohydrates tend to be brittle, it is recommended to add smaller molecules that act as plasticizers in hydrophilic polymers. Examples of this are sugar alcohols such as glycerin and sorbitol, poly(ethylene) glycols,.
  • Proteins such as casein, corn zein, keratin, collagen, gelatin, whey protein, wheat gluten, rapeseed protein, soy protein, kafirin, oat avenin, rice bran protein, lupine protein, cotton proteins or peanut proteins can be used as further natural polymers.
  • Non-water-soluble polymers can also be used, especially those that do not form an oxygen barrier, but still form a barrier against fats and mineral oil vapors. These also have a high, predominantly polar surface energy.
  • Pigments can also be added to all of the polymers mentioned, which improve the barrier effect. However, it is important to ensure that these do not significantly affect the smoothness of the respective layer. This can be achieved by using platelet-shaped pigments with a high form factor (aspect ratio) whose thickness is less than that of the respective layer and whose proportion is not more than 50% by weight of the layer. Examples of such pigments are kaolins, natural and synthetic layered silicates (mica), talc, precipitated Ca carbonates.
  • the coating layer S1 can be applied to one side of the base paper or to both sides. Several coating layers S1 can be arranged on one side of the base paper, in particular the composition or layer thickness or basis weight can be the same or different. The coating B2 and the coating layer S1 can be the same or different, in particular the composition or layer thickness or
  • Weight per unit area can be the same or different
  • barrier layer B1 comprising or consisting of metals, in particular Al, Cu, Sn, Zn, Ag, Au, Ti, In, Si, metal alloys, metal oxides, in particular Al2O3, SiCh, mixed oxides or a combination thereof.
  • barrier paper is preferred, with the barrier layer B1 being applied by means of vacuum deposition or other known or customary methods.
  • barrier layer B1 having at least one of the following features: a) optical density >1.5 and ⁇ 6.0, b) layer thickness >5 nm, preferably >10 nm, particularly preferably >15 nm, in particular 5 nm to 150 nm.
  • the barrier layer B1 can be applied to one side of the base paper or to both sides. Several barrier layers B1 can be arranged on one side of the base paper, in particular the composition or layer thickness can be the same or different.
  • a barrier paper is preferred, with the coating B2 comprising or consisting of at least one polymer, in particular a polymer selected from group a) polyethylene acrylic acid copolymers, b) Polyolefins c) Polyvinyl alcohols, d) Cellulose nitrates, e) Bio-based polymers f) Non-bio-based polymers g) Styrene-butadiene latices, h) Acrylate latices.
  • a barrier paper is preferred, with the coating B2 having at least one of the following properties: a) protection of the barrier layer B1 from external influences, in particular mechanical influences such as buckling in packaging systems, for example when closing the packaging (e.g. sealing seams) or rubbing or chemical influences, b ) sealable, in particular heat-, ultrasound-, cold-sealable, c) grease resistance, d) water resistance, e) moisture resistance, f) printability, g) additional barrier properties, h) optimization of the existing barrier properties.
  • a barrier paper is preferred, the barrier paper having at least one of the following features: a) WVTR ⁇ 5 g/m 2 /d at 23°C and 50% relative humidity b) WVTR inner crease ⁇ 5 g/m 2 /d at 23° C and 50% relative humidity c) WVTR external bend ⁇ 5 g/m 2 /d at 23°C and 50% relative humidity d) WVTR ⁇ 15 g/m 2 /d at 38°C and 90% relative humidity e) WVTR Internal bend ⁇ 15 g/m 2 /d at 38°C and 90% relative humidity f) WVTR External bend ⁇ 15 g/m 2 /d at 38°C and 90% relative humidity g) OTR ⁇ 10 cm 3 /m 2 / d at 23°C and 50% relative humidity h) OTR internal bend ⁇ 10 cm 3 /m 2 /d at 23°C and 50% relative humidity i) OTR external bend ⁇ 10 cm 3 /m 2 /d at 23°C and
  • a barrier paper is preferred, the barrier paper having at least one of the following features: a) WVTR ⁇ 3 g/m 2 /d at 23°C and 50% relative humidity b) WVTR inner crease ⁇ 3 g/m 2 /d at 23° C and 50% relative humidity c) WVTR external bend ⁇ 3 g/m 2 /d at 23°C and 50% relative humidity d) WVTR ⁇ 10 g/m 2 /d at 38°C and 90% relative humidity e) WVTR Internal bend ⁇ 10 g/m 2 /d at 38°C and 90% relative humidity f) WVTR External bend ⁇ 10 g/m 2 /d at 38°C and 90% relative humidity g) OTR ⁇ 5 10 cm 3 /m 2 /d at 23°C and 50% relative humidity h) OTR internal bend ⁇ 5 cm 3 /m 2 /d at 23°C and 50% relative humidity i) OTR external bend ⁇ 5 cm 3 /m 2 /d at 23°C and
  • kink resistance of at least one barrier property in particular in the area of the inner kink or the outer kink, it is meant that the at least one barrier property is less than a maximum of 100%, preferably a maximum of 75%, particularly preferably a maximum of 50% and very particularly preferably a maximum of 25%, in the area of the fold or in the fold differs from the barrier properties of the barrier paper.
  • the measured value for WVTR 1.5 g/m 2 /d (at 38 ° C and 90% relative humidity)
  • the measured value for WVTR is in the area of the inner fold (ie the inner fold is in the measuring surface) or directly at the inner bend in the range from 0 to 3 g/m 2 /d (less than a maximum of 100%).
  • a barrier paper is preferred, with the coating layer Sl, the barrier coating B1 and the barrier coating B2 being removable in the waste paper cycle.
  • a barrier paper is preferred, after processing the
  • the following scores can be achieved according to the Assessment of Printed Product Recyclability, Deinkability Score: a) Brightness Y maximum 35 points, b) Color coefficient a* in the CIELAB system maximum 20 points, c) Dirt points A in the two different size classes A50 maximum 15 points and A250 maximum 10 points, d) Degree of dye removal (printing ink removal) IE maximum 10 points and e) filtrate darkening AY a maximum of 10 points, where the sum of all points is in the range from 0 to 100, preferably in the range from 51 to 70, particularly preferably in the range from 71 to 100, and / or preferably no individual point value is negative.
  • a barrier paper is preferred, with a primer comprising at least one inorganic pigment and a polymeric binder being present between the base paper and the coating color layer S1, the inorganic pigment preferably being platelet-shaped and preferably a talc, a precipitated calcium carbonate, a silicate, preferably a Layered silicate or kaolin and / or that the polymeric binder comprises a polymeric binder based on a polyacrylate.
  • the precoat preferably comprises at least one polymeric binder and at least one organic and/or one inorganic pigment and possibly further coating color components in the usual amounts.
  • Pigments layered silicates.
  • Polymeric binders styrene acrylate latex, butadiene latex.
  • Rheology modifiers such as acrylate-based thickeners and/or zirconium-based crosslinkers.
  • a barrier paper is preferred, with the basis weight of the coating color layer S1 and the coating B2 being in the range from 4 to 20 g/m 2 , preferably from 8 to 15 g/m 2 , based on the dried end product (Lutro).
  • barrier paper is preferred, with the barrier paper being free of halogen-containing compounds except for unavoidable traces.
  • a barrier paper is preferred, with the base paper having a basis weight of 20 to 120 g/m 2 , preferably 40 to 100 g/m 2 .
  • a barrier paper is preferred, the base paper having a long fiber content of 10 to 80% and a short fiber content of 20 to 90% by weight, a long fiber being a fiber with a fiber length of 2.6 to 4.4 mm and a short fiber being a Fiber with a fiber length of 0.7 to 2.2 mm.
  • a barrier paper is preferred, with the base paper comprising or consisting of 100% virgin fiber pulp and up to 100% recycled fibers or comprising or consisting of mixtures of both.
  • a barrier paper is preferred, with the base paper comprising up to 90% recycled fibers.
  • the base paper preferably has a starch line or a starch-containing line on one or both sides, in particular to improve printability.
  • the present invention further relates to a method for producing a barrier paper, which is characterized in that an aqueous suspension comprising the starting materials of the coating layer Sl is applied directly or indirectly to a base paper, the aqueous application suspension having a solids content of 5 to 50 wt. -%, preferably from 10 to 30% by weight, and is applied with a curtain coating process (curtain coating), preferably with a double curtain coating process (double curtain coating) at an operating speed of the coating system of at least 200 m / min.
  • a curtain coating process curtain coating
  • double curtain coating double curtain coating
  • the barrier paper is preferably re-moistened with a dampening unit or a steam blow box in order to achieve a moisture content of between 2.5 and 7%, preferably between 3.5 and 5%, particularly preferably between 4 and 4, based on the total mass. 5% to achieve.
  • a moisture content of between 2.5 and 7%, preferably between 3.5 and 5%, particularly preferably between 4 and 4, based on the total mass. 5% to achieve.
  • This is ideal for the barrier coating Bl, especially if it involves metallization, in order to maintain the flexibility of the coating layer Sl and the base paper, but also to prevent too much moisture from entering a coating chamber (e.g. vacuum chamber).
  • the barrier paper is re-moistened with a dampening unit or a steam blow box to achieve a moisture content of between 2.5 and 7%, preferably between 3.5 and 5%, particularly preferably between 4 and 4, based on the total mass. 5% to achieve.
  • the surface of the coating layer S1 is smoothed/satinized using one or more roller calenders, satin calenders or shoe calenders to a smoothness value of at least 200 Bekk seconds, in particular 500 Bekk seconds.
  • the barrier layer B1 is applied directly or indirectly to the coating layer S1 using conventional methods.
  • the coating B2 can then be applied directly or indirectly to the barrier layer B1 using conventional methods and, if necessary, dried using conventional methods.
  • a full-surface or partial sealing varnish in particular a heat sealing varnish or cold sealing varnish, can be applied to the coating B2 and/or to the opposite outside of the barrier paper directly or indirectly using conventional methods and dried indirectly or directly using conventional methods.
  • a full-surface or partial print can be applied to the coating B2 or to the opposite outside to make the packaging recognizable and to provide information, either directly or indirectly using conventional methods, and dried indirectly or directly using conventional methods.
  • the present invention also relates to the use of the barrier paper according to the invention or the barrier paper produced according to the method as packaging material for food, consumer goods, tobacco products or as a component of packaging material, in particular of packaging material based on cardboard or cardboard, in particular as packaging material for Food, especially sausage, cheese, coffee, muesli bars, chocolate, products containing chocolate, or chips.
  • the present invention also relates to a packaging comprising a barrier paper according to the invention or a barrier paper produced according to the method, the packaging preferably being a cold-sealed packaging, a heat-sealed packaging, an ultrasound-sealed packaging, in particular a tubular bag packaging.
  • the coated side (inside) of the packaging is directed inwards (inside of the packaging) and the outside is directed outwards.
  • the outside is printed and the inside is sealed to the inside (A:A sealing) and/or the inside is sealed to the outside (A:B sealing).
  • the packaging in which the coated side (inside) is directed outwards (outside of the packaging) and the outside is directed inwards.
  • the inside is printed and the outside is sealed to the outside (A:A seal) and/or the outside is sealed to the inside (A:B seal).
  • the quality of the barrier paper according to the invention in particular with regard to its kink resistance, can be determined, among other things, by dynamic mechanical thermal analysis (DMTA).
  • DMTA dynamic mechanical thermal analysis
  • DMTA Dynamic mechanical thermal analysis
  • Dynamic mechanical thermal analysis is a method for measuring the viscoelastic properties of a polymer or material system. By applying cyclic sinusoidal stress/strain forces to induce deformation without destruction, a phase angle can be calculated by shifting the sinusoidal response of the material.
  • the tan value is therefore a value that represents the relationship between the elastic modulus (G') and the viscous modulus (G") - given by the following equation:
  • the tan value (a quantified loss attenuation effect), elastic modulus (G'), and viscous modulus (G") of packaging materials that retain their barrier properties after folding can be compared to packaging materials that lose the intended barrier properties.
  • a tan for a material that retains its barrier properties after folding and a tan for a material that loses its barrier properties after folding.
  • the barrier paper according to the invention is further preferably characterized in that the values for the loss factors tan Delta measured by dynamic mechanical thermal analysis (DMTA) of the barrier paper as a function of the temperature pass through a maximum at the temperature Tg and a first turning point at the temperature Tw as the temperature increases .
  • DMTA dynamic mechanical thermal analysis
  • the temperature Tg is preferably lower than the temperature Tw.
  • Barrier papers which, depending on the temperature, have measured values for the loss factors tan delta as the temperature increases, a maximum at the temperature Tg and a first turning point at the temperature Tw, preferably where Tg is lower than Tw, are characterized by the fact that they After bending, the barrier properties are advantageously retained.
  • the magnitude of the difference between tan delta at the temperature Tg and tan delta at the temperature Tw is > 0.013, preferably > 0.014 and particularly preferably > 0.015.
  • the barrier properties after the kinks are advantageously retained.
  • the onset temperature is determined using DSC as follows:
  • the (extrapolated) onset temperature (according to DIN EN ISO 11357-1:2010-03) is the intersection of the extrapolated baseline and the turning tangent at the beginning of the melting or crystallization peak in a DSC measurement.
  • the baseline and the turning tangent are determined from the temperature-dependent heat flow signal.
  • the initial temperature can be specified as the melting temperature.
  • the onset temperature is less dependent on the heating rate and the sample mass.
  • onset temperatures are commonly used for temperature calibration of a DSC.
  • the barrier paper according to the invention is characterized in particular by the fact that it is particularly suitable as a packaging material for moisture- and oxidation-sensitive and greasy objects, in particular food, and can be used to produce bags using hot or cold sealing applications, with a water-based cold sealing adhesive being used for the cold sealing application can be used. Furthermore, no layers or barrier layers based on halogen-containing compounds need to be present.
  • partially saponified polyvinyl alcohols Compared to fully saponified polyvinyl alcohols (PVOH) or polyethylene vinyl alcohols (EVOH), partially saponified polyvinyl alcohols have the advantage that they have a significantly lower optimal sealing temperature in the heat sealing process. This does not negatively affect the seal seam strength. Furthermore, partially saponified polyvinyl alcohols have a slightly lower viscosity, but the concentration is otherwise the same. A high viscosity is seen as a disadvantage, as in this case the PVOH solution has to be diluted more, which is why a larger amount of water has to be dried in the coating process. This not only costs energy and therefore requires a coating system with a higher drying capacity, but can also be difficult to implement in terms of application technology, depending on the desired application weight. In addition, the diffusion of water molecules at high viscosities and thus the drying itself slowed down. Furthermore, it is more likely that gaseous water will accumulate in the coating, which leads to the formation of macroscopic coating defects.
  • partially saponified polyvinyl alcohols or partially saponified polyvinyl alcohol copolymers, such as polyethylene vinyl alcohols, are preferred over the fully saponified variants.
  • the vacuum deposition layer Due to its minimal thickness, the vacuum deposition layer must in turn be protected against scratching, abrasion, oxidation and breaking. In addition, for certain packaging production, an additional sealing layer is necessary to produce bags or similar packaging forms. This is achieved by applying a coating B2 to the barrier layer B1 (e.g. vacuum deposition layer). In addition, the coating B2 can further improve the oxygen or water vapor barrier.
  • the barrier layer B1 e.g. vacuum deposition layer.
  • the barrier paper according to the invention is also characterized by an improved oxygen barrier, an improved fat barrier, an improved mineral oil barrier and an improved water vapor barrier.
  • the barrier paper according to the invention also has improved kink resistance without impairing the barrier effect and is also characterized by high tear resistance.
  • the barrier paper according to the invention can also be reused via the waste paper cycle.
  • barrier paper according to the invention is used as a packaging material for food, it is characterized in particular by the fact that it does not influence and/or change the taste of the packaged food.
  • the barrier paper according to the invention is also heat-sealable and shows improved cold-seal properties (compatible with the sealing medium, such as a water-based cold-seal adhesive), with the sealing seams each having sufficient moisture resistance.
  • the barrier paper according to the invention is also easy to print on the uncoated side (outside) and on the coated side (inside).
  • the barrier paper according to the invention can ultimately be produced relatively easily and with low application weights and reused via the waste paper cycle.
  • Hydrophobic polymers are also called non-polar polymers and hydrophilic polymers are also called polar polymers.
  • Hydrophobicity or hydrophilicity can be defined, for example, using the logP value.
  • the n-octanol-water distribution coefficient K ow (notations such as octanol/water distribution coefficient are also common and correct) is a dimensionless distribution coefficient known to those skilled in the art, which indicates the ratio of the concentrations of a chemical in a two-phase system of n-octanol and water and is therefore a measure of the hydrophobicity or hydrophilicity of a substance.
  • the logP value is the decadal logarithm of the n-octanol-water partition coefficient K ow .
  • c 0 Si concentration of a chemical in the octanol-rich phase
  • c w Si concentration of a chemical in the water-rich phase.
  • Kow is greater than one if a substance is more soluble in fat-like solvents such as n-octanol, less than one if it is more soluble in water. Accordingly, log P is positive for hydrophobic/lipophilic and negative for hydrophilic/lipophobic substances.
  • ethylene-containing polymers such as (saponified) polyethylene vinyl alcohols
  • have a lower water vapor permeability which is due to the ethylene content and the associated lower hydrophilicity.
  • the base paper used in the coated paper according to the invention is in principle not limited.
  • the base paper has a basis weight of 20 to 120 g/m 2 , preferably 40 to 100 g/m 2 .
  • the base paper has a composition with a long fiber content of 10 to 80% by weight, preferably from 20 to 50% by weight, and a short fiber content of 20 to 90% by weight, preferably from 50 to 80% by weight .-%, having.
  • Long fiber is a fiber with a fiber length of 2.6 to 4.4 mm and short fiber is a fiber with a fiber length of 0.7 to 2.2 mm.
  • fillers preferably excluding the value 0%, such as GCC (ground calcium carbonate), which is known, for example, under the trade name Hydrocarb 60 or Hydroplex 60, PCC (precipitated calcium carbonate ), which is known, for example, under the trade name Precarb 105, natural kaolin and/or talc, as well as common auxiliaries such as retention agents and/or sizing agents.
  • GCC ground calcium carbonate
  • HPC ground calcium carbonate
  • Precarb 105 natural kaolin and/or talc
  • common auxiliaries such as retention agents and/or sizing agents.
  • Common packaging systems include vertical and horizontal tubular bag machines (form-fill-seal) for the production of stand-up pouches, flow packs, pillow packs, etc., machines that bring together two webs of the same or different materials and connect them by heat sealing, cold sealing or ultrasonic sealing, e.g. B. also tray sealers, chamber band machines (also with vacuum), bag filling and sealing machines, thermoforming packaging machines, linear filling machines that attach lids by heat sealing for closing, wrapping machines with a final heat sealing step, blister packaging machines and X-fold packaging machines.
  • the barrier paper according to the invention is further preferably characterized in that a primer comprising at least one inorganic pigment and a polymeric binder is present between the base paper and the coating color layer S1.
  • the inorganic pigment is preferably platelet-shaped and in particular comprises a talc, precipitated calcium carbonate or silicates, preferably layered silicates and most preferably a kaolin.
  • Suitable polymeric binders include, in particular, acrylate-based or styrene/butadiene-based binders. In principle, all polymers that can be used as binders for pigment coatings in the paper industry are suitable. Starch-based binders (solutions of modified starches, dispersions of cross-linked starches, so-called biolatices) and polymer-starch hybrid latices are also possible.
  • the polymeric binder preferably comprises a polymeric binder based on a polyacrylate.
  • the primer can be a hydrophobic primer.
  • the primer is overall hydrophilic.
  • the precoat preferably contains 1 to 70% by weight, preferably 5 to 50% by weight, of polymeric binder. The amount refers to the dried precoat in the final product.
  • the precoat also preferably contains 50 to 95% by weight, preferably 80 to 90% by weight, of inorganic pigment.
  • the amount refers to the dried precoat in the final product.
  • the primer can contain additives such as thickeners, e.g. acrylate-based thickeners, surfactants and/or rheology modifiers.
  • thickeners e.g. acrylate-based thickeners
  • surfactants e.g. acrylate-based thickeners
  • rheology modifiers e.g. rheology modifiers
  • the use of networkers is also conceivable.
  • the primer preferably contains a zirconium-based crosslinker and is itself crosslinked with formaldehyde.
  • additives are preferably each contained in an amount of 0 to 2% by weight, preferably greater than 0 to 2% by weight, with the value 0% preferably being excluded.
  • the amount refers to the dried precoat in the final product.
  • the application amount of the primer is preferably 1 to 10 g/m 2 and particularly preferably 2 to 6 g/m 2 .
  • the amount refers to the dried precoat in the final product.
  • this primer also called primer
  • this primer reduces the average roughness of the base paper and offers an advantageous "holdout", which is characterized by an area-wide application and a defined surface energy, so that an applied coating color layer 1 can be formed optimally.
  • the primer also mediates the layer adhesion between the base paper and the coating layer 1, which can be important for later sealing applications.
  • the coating layer 1 applied to the precoat preferably comprises an at least partially saponified polyvinyl alcohol and/or an at least partially saponified polyvinyl alcohol copolymer.
  • the formulation used preferably has an amount of 10 to 100% by weight, particularly preferably 50 to 99.8% by weight, of polymer.
  • the coating layer 1 can further contain additives, such as thickeners, for example acrylate-based thickeners, surfactants, for example sulfosuccinates, extensional rheology aids, for example polyacrylamides, carboxymethyl cellulose, polyvinyl alcohols, and/or crosslinking agents, such as aldehydes and polyvalent aldehydes, zirconates, polyvalent epoxides, epichlorohydrin resins and/or hydrazides .
  • additives such as thickeners, for example acrylate-based thickeners, surfactants, for example sulfosuccinates, extensional rheology aids, for example polyacrylamides, carboxymethyl cellulose, polyvinyl alcohols, and/or crosslinking agents, such as aldehydes and polyvalent aldehydes, zirconates, polyvalent epoxides, epichlorohydrin resins and/or hydrazides .
  • additives are preferably each contained in an amount of 0.1 to 1% by weight, based on the total weight of the coating color layer 1.
  • the barrier paper according to the invention is further preferably characterized in that the at least partially saponified polyvinyl alcohol and/or the at least partially saponified polyvinyl alcohol copolymer has an average molecular weight of less than 100,000 g/mol.
  • the barrier paper according to the invention is further preferably characterized in that the at least partially saponified polyvinyl alcohol and/or the at least partially saponified polyvinyl alcohol copolymer has an average molecular weight of greater than 30,000 g/mol or greater than 40,000 g/mol or greater than 50,000 g/mol or greater than 60,000 g/mol or greater than 70,000 g/mol.
  • the barrier paper according to the invention is further preferably characterized in that the at least partially saponified polyvinyl alcohol and/or the at least partially saponified polyvinyl alcohol copolymer has a degree of saponification of 30% to 100%.
  • the barrier paper according to the invention is further preferably characterized in that the at least partially saponified polyvinyl alcohol and/or the at least partially saponified polyvinyl alcohol copolymer has a degree of saponification of 30% to less than 100%.
  • the barrier paper according to the invention is further preferably characterized in that the at least partially saponified Polyvinyl alcohol and / or the at least partially saponified polyvinyl alcohol copolymer has a degree of saponification of less than 95% or from 30% to 95%.
  • the barrier paper according to the invention is further preferably characterized in that the at least partially saponified polyvinyl alcohol and/or the at least partially saponified polyvinyl alcohol copolymer has a degree of saponification of 95% to 100%.
  • the barrier paper according to the invention is further preferably characterized in that the at least partially saponified polyvinyl alcohol and/or the at least partially saponified polyvinyl alcohol copolymer has a degree of saponification of 95% to less than 100%.
  • the barrier paper according to the invention is further preferably characterized in that the at least partially saponified polyvinyl alcohol and/or the at least partially saponified polyvinyl alcohol copolymer has an onset temperature of less than 200° C., determined by DSC
  • the barrier paper according to the invention is further preferably characterized in that the at least one polymer is a partially saponified polyvinyl alcohol with a degree of saponification of less than 95% or from 30% to 95%, an average molecular weight of greater than 0 and less than 100,000 g/mol and an onset determined by DSC -Temperature of less than 200°C.
  • the at least one polymer is a partially saponified polyvinyl alcohol with a degree of saponification of less than 95% or from 30% to 95%, an average molecular weight of greater than 0 and less than 100,000 g/mol and an onset determined by DSC -Temperature of less than 200°C.
  • the barrier paper according to the invention is further preferably characterized in that the at least one polymer is a partially saponified polyvinyl alcohol with a degree of saponification of 95% to 100%, an average molecular weight of greater than 70,000 g / mol and an onset temperature determined by DSC of less than 200°C.
  • the barrier paper according to the invention is further preferably characterized in that the at least one polymer is a partially saponified polyvinyl alcohol copolymer, preferably a partially saponified polyethylene vinyl alcohol, with a degree of saponification of 95% to 100%, an average molecular weight of greater than 60,000 g / mol and a Onset temperature determined by DSC of less than 210 ° C. It has been shown that a partially saponified polyvinyl alcohol copolymer such as polyethylene vinyl alcohol is generally more flexible than a polyvinyl alcohol.
  • the barrier paper according to the invention is preferably characterized in that the at least one polymer is a mixture of a partially saponified polyvinyl alcohol with a degree of saponification of 1% to 95%, an average molecular weight of greater than 0 and less than 100,000 g/mol and a value determined by DSC Onset temperature of less than 200 ° C, a partially saponified polyvinyl alcohol with a degree of saponification of 95% to 100%, an average molecular weight of greater than 70,000 g / mol and an onset temperature of less than 200 ° C determined by DSC and / or a partially saponified polyvinyl alcohol copolymer, preferably a partially saponified polyethylene vinyl alcohol, with a degree of saponification of 95% to 100%, an average molecular weight of greater than 60,000 g / mol and an onset temperature determined by DSC of less than 210 ° C.
  • the at least one polymer is a mixture of a partially saponified polyvinyl alcohol with
  • the degree of saponification was determined based on DIN EN ISO 3681 as follows:
  • the degree of saponification (%) can be determined according to Eq. 1 calculate:
  • the average molecular weights were determined by size exclusion chromatography (GPC) under the following conditions:
  • the samples were dissolved in the solvent (5 mg/mL) at a temperature of 80 °C for three hours and injected using an autosampler.
  • the barrier paper according to the invention is further preferably characterized in that the polyvinyl alcohol has a viscosity of less than 30 mPas or less than 20 mPas, particularly preferably less than 15 mPas, at a dry content of 4%.
  • the viscosity is determined at 23°C using a Brookfield viscometer at 100 rpm.
  • a viscosity in this range has the advantage that higher solids contents can be used in the application and therefore less energy has to be used for drying, and higher process speeds can also be achieved. In addition to a financial advantage, this is also reflected in the use of a larger drying window on coating systems.
  • the quality of the barrier paper according to the invention in particular with regard to its kink resistance, can be determined by dynamic mechanical thermal analysis (DMTA).
  • Dynamic mechanical thermal analysis can also be used to determine the glass transition temperature (Tg) - the temperature at which the polymer chains transition from a solid, frozen state to a mobile state, but before the polymer chains slide past each other, which is the melting point (Tm ) corresponds. It is advantageous if a viscoelastic state exists in a packaging material in order to maintain a barrier property after kinking or folding - therefore a Tg below the operating and use temperature is ideal.
  • the Tg in DSC is determined by the temperature at which browning reaches a maximum.
  • Preferred polymers have a glass transition temperature Tg corresponding to the tan maximum.
  • the barrier paper according to the invention preferably has a breaking force of >80 N/15 mm, preferably >90 N/15 mm in the running direction, and >40 N/15 mm, preferably >50 N/15 mm transverse to the paper running direction.
  • the barrier paper according to the invention also preferably has a dynamic coefficient of friction (CoF) of ⁇ 0.7, preferably ⁇ 0.6, particularly preferably ⁇ 0.5. This refers to the friction of the coated side on the coated side (coating against coating).
  • CoF dynamic coefficient of friction
  • the barrier paper according to the invention is further preferably characterized in that the application weight per unit area of the individual layers is 4 to 20 g/m 2 , preferably from 4 to 15 g/m 2 , based on the dried end product (Lutro).
  • the barrier paper according to the invention is further preferably characterized in that the coating B2 can be wetted with common water-based cold seal adhesives.
  • the surface energy of the coating B2 is >35 mN/m >40 mN/m, preferably >50 mN/m, particularly preferably >55 mN/m.
  • Such wettability of the coating B2 has the advantage that no streak-free areas form during the application and drying process of cold seal adhesives and there is also sufficient adhesion for the application.
  • the barrier paper according to the invention is further preferably characterized in that the barrier paper has an oxygen permeability (OTR) 10 cm 3 /m 2 /d (23 ° C, 0% relative humidity) of less than 10, preferably less than 5.
  • OTR oxygen permeability
  • the barrier paper according to the invention is further preferably characterized in that the barrier paper has an oxygen permeability (OTR) 10 cm 3 /m 2 /d (23 ° C, 50% relative humidity) of less than 10, preferably less than 5.
  • OTR oxygen permeability
  • the barrier paper according to the invention is further preferably characterized in that the barrier paper has an oxygen permeability (OTR) 10 cm 3 /m 2 /d (23 ° C, 70% relative humidity) of less than 20, preferably less than 15.
  • OTR oxygen permeability
  • the barrier paper according to the invention is further preferably characterized in that the barrier paper has an oxygen permeability (OTR) 10 cm 3 /m 2 /d (23 ° C, 80% relative humidity) of less than 50, preferably less than 40.
  • OTR oxygen permeability
  • the barrier paper according to the invention preferably does not lose this oxygen barrier due to the mechanical stress of 180 ° bends with a roller which exerts a load of 330 g / cm on the resulting bend and in which the coating can be located on the inside (inside bend) or outside (outside bend). .
  • the oxygen permeability (or oxygen transmission rate - OTR) is determined according to ISO 15105-2.
  • the barrier paper according to the invention is further preferably characterized in that the barrier paper has a grease barrier in accordance with test condition I according to DIN 53116.
  • the barrier paper according to the invention preferably does not lose this grease barrier due to the mechanical stress of 180 ° bends with a roller which exerts a load of 330 g / cm on the resulting bend and in which the coating can be located on the inside (inside bend) or outside (outside bend). .
  • the barrier paper according to the invention is further preferably characterized in that the barrier paper has a mineral oil barrier (hexane) of ⁇ 10 g/m 2 /d.
  • the barrier paper according to the invention preferably does not lose this mineral oil barrier (hexane) due to the mechanical stress of 180° bends with a roller which exerts a load of 330 g / cm on the resulting bend and in which the coating is on the inside (inside bend) or outside (outside bend ) can be located.
  • this mineral oil barrier hexane
  • the mineral oil barrier is determined by filling hexane into a beaker (solvent-resistant), sealing it tightly with the coated paper and tracking the weight loss over time.
  • the barrier paper according to the invention is further preferably characterized in that the barrier paper has a water vapor permeability g/m 2 /d (23° C., 50% relative humidity) of less than 10, preferably less than 5.
  • the barrier paper according to the invention is further preferably characterized in that the barrier paper has a water vapor permeability g/m 2 /d (23° C., 85% relative humidity) of less than 10, preferably less than 5.
  • the barrier paper according to the invention is further preferably characterized in that the barrier paper has a water vapor permeability g/m 2 /d (38° C., 50% relative humidity) of less than 10, preferably less than 5.
  • the barrier paper according to the invention is further preferably characterized in that the barrier paper has a water vapor permeability g/m 2 /d (38° C., 70% relative humidity) of less than 20, preferably less than 10.
  • the barrier paper according to the invention is further preferably characterized in that the barrier paper has a water vapor permeability g/m 2 /d (38° C., 90% relative humidity) of less than 20, preferably less than 10.
  • the barrier paper according to the invention is further preferably characterized in that the barrier paper has a water vapor barrier. This remains even if the coating comes into contact with grease, which does not apply to all water vapor barriers.
  • the barrier paper according to the invention is further preferably characterized in that it is both uncreased and kink-resistant both in the inner crease and in the outer crease.
  • the coated paper according to the invention is characterized by its reusability via the waste paper cycle.
  • the coated paper according to the invention is characterized by its reusability via the waste paper cycle.
  • coated paper according to the invention is characterized by biodegradability in the maritime sector according to ASTM D7081
  • the barrier paper according to the invention is sensory-safe and achieves at least a value of ⁇ 2 (according to standard DIN1230-l:2010-02).
  • the barrier paper according to the invention is heat-sealable and preferably results in seal seam strength (cold tack) at the optimal sealing temperature. of >3.5 N/15mm, particularly preferably of >5.0 N/15mm, the seal seam strength for the barrier paper being determined as follows:
  • the barrier paper was sealed at 3.3 bar for 0.3 seconds in the temperature range from 100°C to 230°C across the direction of paper travel and the seal seam strength (cold tack) was determined according to DIN 55529 (2012).
  • Heat sealing is preferably understood to mean the joining of two layers of barrier paper by means of local heat and/or pressure.
  • the coated side of the paper can also be connected to a non-heat-sealable opposite side of the paper, to a heat-sealable opposite side of the paper or with another paper can be connected by heat sealing.
  • the barrier paper according to the invention can also be cold-sealed due to its compatibility with common cold-sealing media.
  • Cold sealing usually means that a cold seal adhesive is applied to the section of flat packaging material to be sealed using a printing process.
  • a cold seal adhesive has the property that it only develops an adhesive effect under and after increased pressure between the sealing jaws of a packaging machine and is otherwise not sticky or only sticky to a limited extent.
  • Ultrasonic sealing means focusing the energy of the ultrasound on the point where welding is to take place and the heat is generated by friction, particularly for heat sealing. Usual sealing time is between 100 and 200 milliseconds. In contrast to heat sealing, e.g. using sealing jaws, with ultrasonic technology the heat required is only generated within the materials to be welded. The tools stay cold and help heat to flow away.
  • Both the heat-sealed barrier paper, the cold-sealed barrier paper and the ultrasonically sealed barrier paper are characterized by the high moisture resistance of the sealing seam.
  • the barrier paper according to the invention is also tear-resistant.
  • the barrier paper according to the invention is also characterized by the fact that the taste of foods packaged in it is not influenced.
  • the barrier paper according to the invention can be obtained economically using known manufacturing processes.
  • the barrier paper according to the invention using a process in which an aqueous suspension comprising the starting materials of the coating color layer S1 is applied to the base paper, the aqueous application suspension having a solids content of 5 to 50% by weight, preferably 10 up to 30% by weight, and are applied with a curtain coating process (curtain coating), preferably with a double curtain coating process (double curtain coating) at an operating speed of the coating system of at least 200 m / min.
  • a curtain coating process curtain coating
  • double curtain coating double curtain coating
  • This process is particularly advantageous from an economic point of view and due to the uniform application over the paper web.
  • the curtain coating process a free-falling curtain of a coating dispersion is formed.
  • the coating dispersion which is in the form of a thin film (curtain)
  • curtain is “poured” onto a substrate by free fall in order to apply the coating dispersion to the substrate.
  • DE 10 196 052 TI discloses the use of the curtain coating coating process in the production of information recording materials , wherein multilayer recording layers are realized by applying the curtain, consisting of several coating dispersion films, to substrates.
  • the aqueous deaerated application suspension has a viscosity of about 100 to about 800 mPas (Brookfield, 100 rpm, 20 ° C).
  • the viscosity of the aqueous deaerated application suspension is particularly preferably about 200 to about 500 mPas.
  • the surface tension of the aqueous application suspension can be set to about 25 to about 70 mN/m, preferably to about 35 to about 60 mN/m (measured based on the standard for bubble pressure tensiometry (ASTM D 3825-90) , as described below).
  • ASTM D 3825-90 standard for bubble pressure tensiometry
  • polyvinyl alcohol solutions require significantly less surfactant to produce an identical surface tension compared to dispersions, especially those with small particle sizes and therefore high particle surface areas.
  • the dynamic surface tension is measured using a bias pressure tensiometer.
  • the maximum internal pressure of a gas bubble that is formed in a liquid via a capillary is measured.
  • the internal pressure p of a spherical gas bubble depends on the radius of curvature r and on the surface tension o: n — 2o
  • the radius of the capillary is determined using a reference measurement that is carried out with a liquid with a known surface tension, usually water. If the radius is then known, the surface tension can be calculated from the pressure maximum pmax. Since the capillary is immersed in the liquid, the hydrostatic pressure pO must be subtracted from the measured pressure, which results from the immersion depth and the density of the liquid (this occurs automatically with modern measuring instruments). This results in the following formula for the bubble pressure method:
  • the measured value corresponds to the surface tension at a certain surface age, the time from the start of bubble formation until the pressure maximum occurs.
  • the speed of bubble generation By varying the speed of bubble generation, the dependence of surface tension on surface age can be recorded, resulting in a curve in which surface tension is plotted over time.
  • the individual coatings can be formed on-line on a paper machine with a coating mechanism or in a separate coating process off-line on a coating machine.
  • the individual layers can also be applied to the base paper using the following methods:
  • the coating layer S1 can be applied to the base paper and/or to existing primers using a printing process.
  • the coating layer S1 can be applied by extrusion to the base paper and/or to existing primers. This technique has the advantage that significantly more material can be applied, but this is only of interest if the entire product does not need to be recyclable as paper.
  • the disadvantages, however, are lower application speeds, higher energy consumption and a higher minimum application weight.
  • the coating layer S1 can be applied by lamination or laminating paper, for example in the form of plastic films on the base paper and/or on existing primers.
  • the coating layer S1 and the primer can also be applied one after the other over several application steps.
  • the present invention further relates to a barrier paper which is obtainable using the processes described above.
  • the coating layer S1 is also suitable for applying further barriers in the form of aqueous polymer solutions or dispersions, by melt extrusion or lamination with films.
  • the coating layer S1 can be smoothed in order to achieve a Bekk smoothness of at least 200 Bekk seconds, in particular 500 Bekk seconds.
  • a further layer is applied to the metallized layer using vacuum deposition.
  • the coating color layer S1 can be improved with regard to all barriers if necessary by applying a barrier layer B1, in particular an ultra-thin metal layer, metal oxide layer, or other inorganic compound by vapor phase deposition or in particular vacuum vapor phase deposition.
  • a barrier layer B1 in particular an ultra-thin metal layer, metal oxide layer, or other inorganic compound by vapor phase deposition or in particular vacuum vapor phase deposition.
  • Such thin barrier layers are only effective if they adhere to a very smooth, flexible surface that does not contain any particles (e.g. inorganic pigments) and can form a closed layer on top.
  • the comparatively high surface energy of the coating layer SI especially that of the comprehensive polymers, promotes the layer adhesion of polar materials such as metal oxides and other inorganic oxides as well as polarizable electrically conductive materials such as metals.
  • the barrier papers obtained in this way can in turn be made sealable again by applying a heat-sealing layer or a cold-sealing adhesive.
  • a further coating B2 is applied to the barrier layer B1 applied by vacuum deposition using gravure printing (also curtain coating or other printing processes).
  • Gravure printing also curtain coating or other printing processes.
  • the present invention also relates to the use of a barrier paper as described above or a barrier paper obtainable by the method described above as a packaging material.
  • the present invention also relates to the use of a barrier paper as described above or a barrier paper obtainable by the method described above as a packaging material for food, in particular for fatty, moisture-sensitive and oxidation-sensitive foods.
  • the present invention further preferably relates to the use of a barrier paper as described above or a barrier paper obtainable by the method described above as packaging material for, for example, cereal bars, chocolate, meat, sausage, cheese, products containing chocolate, butter and margarine, snacks, chips, for example potato chips. or lentil chips, products fried in vegetable oil such as chips, salty snacks, cookies, crackers, protein bars, sports and fitness bars, dietary supplements, stock cubes, cosmetic products such as powder and makeup, coffee and tea, pet food, tobacco products (including as innerliners), yogurt (as a lid).
  • a barrier paper as described above or a barrier paper obtainable by the method described above as packaging material for, for example, cereal bars, chocolate, meat, sausage, cheese, products containing chocolate, butter and margarine, snacks, chips, for example potato chips. or lentil chips, products fried in vegetable oil such as chips, salty snacks, cookies, crackers, protein bars, sports and fitness bars, dietary supplements, stock cubes, cosmetic products such as powder and makeup, coffee and tea, pet
  • the barrier paper according to the invention is applied to cardboard or cardboard, in particular by laminating, laminating or gluing.
  • the present invention also relates to the use of a composite in which a barrier paper according to the invention is applied to cardboard or cardboard, in particular by lamination, laminating or gluing, as packaging material for food, in particular for fatty and oxidation-sensitive food.
  • packaging materials can be produced in a simple and economical manner that have the advantages of both material components, such as the increased strength and rigidity of cardboard or cardboard compared to coated paper and the described advantages of barrier papers.
  • the application can be carried out, for example, using starch or aqueous dispersion adhesives.
  • the barrier paper can therefore preferably be a component of packaging materials based on cardboard or cardboard.
  • packaging materials preferably have a mass fraction of greater than 95% by weight of the uniform material type paper, cardboard or cardboard.
  • a further advantage of the present invention arises here that these packaging materials according to the invention are not composite packaging according to Section 3 (5) of the Packaging Act and thus this embodiment of the present invention contributes significantly to reducing the effects of packaging waste on the environment.
  • the present invention also relates to packaging comprising a barrier paper as described above or in a composite with cardboard or cardboard as described above.
  • the packaging may be cold-sealed packaging.
  • Cold-sealed packaging is preferably suitable for foods such as Packaging chocolate, chocolate-containing products, bars, such as muesli bars, and/or other confectionery. This is due on the one hand to the heat sensitivity of the chocolate and also to a possible higher machine speed.
  • Packaging machines based on cold sealing can be operated more quickly because heating a heat sealing medium takes a comparatively long time.
  • the packaging can also be heat-sealed packaging.
  • Heat-sealed packaging is preferably suitable for use as secondary packaging or packaging of containers via dosing and filling scales.
  • the packaging can also be cold-sealed packaging
  • the packaging can also be primary or secondary packaging, in particular heat-sealed or cold-sealed tubular bag packaging, flow wrap, stand-up pouches, wrapping papers, 3- and 4-edge sealed bags, lids.
  • the barrier paper can also be used rotated so that the inside faces out and the outside faces in. This ensures that it can be used in humid environments.
  • sealing wax must also be applied partially or over the entire surface or the packaging must be sealed using ultrasound.
  • the coating B2 is coated or printed.
  • the coating B2 can be opaque in order to prevent the barrier layer B1 from showing through.
  • the coating B2 can also be printed with an opaque layer.
  • the barrier paper according to the invention preferably comprises at least one base paper on two sides (surfaces) with different roughness (rougher side r and smoother side g).
  • the rougher side (r) of the base paper is preferably used for the coating using a primer, coating layer Sl, barrier layer B1 and barrier layer B2 (inside).
  • the less rough side (r) is preferably used for printing using gravure printing (outside).
  • the smoother side (g) can also be used for coating using a primer, coating layer Sl, barrier layer B1 and barrier layer B2 (inside) and the rougher side (r) can be used for printing (outside).
  • This embodiment has poorer printability, but due to its less rough surface leads to an improvement in the barrier properties of the coating layer Sl or to a saving of material of the coating layer Sl while maintaining the same barrier properties (eg the same property with a smaller layer thickness).
  • Figure 1 shows two basic structures a) and b) of barrier papers according to the invention with the following reference numbers:
  • Base paper g smoother surface of the base paper r: rougher surface of the base paper 2: Coating color layer Sl 3: Barrier layer Bl 4: Coating B2 5: Primer coat, optional for better coating color hold-out to avoid seepage of the coating color layer Sl into the base paper 6: Starch coating , optional for better printability 7: Barrier paper according to the invention
  • a sealing surface of the barrier paper B B sealing surface of the barrier paper A/A sealing A/B sealing
  • Figure 2 shows two SEM surface images of comparative example V3 (inner bend) in different resolutions.
  • the top coating (Bl) as a top view. You can see that this has broken due to the buckling stress in the surface.
  • Figure 3 shows two SEM surface images of example B1 (inner bend) at different resolutions.
  • the top coating coating B2 as a top view. You can see that this has been stressed by the buckling stress, but has not broken.
  • Figure 4 shows two SEM surface images of comparative example V5 (inner bend).
  • the top coating (B2) as a top view.
  • the coating layer Sl is missing here. You can see that this has broken due to the buckling stress in the surface.
  • Figure 5 shows two images after the palm kernel fat test (inside bend on the left, outside bend on the right) of comparative example VI.
  • the top coating (paint layer Sl) as a top view. In this case the layer thickness was halved. You can see that this halving does not lead to any problems in the flat fat barrier (right and left of the bend), but does lead to problems in the bend resistance (fat penetration in the bend and in the edge area of the bend).
  • Figure 6 shows two images after the palm kernel fat test (inside bend on the left, outside bend on the right) of comparative example V2.
  • the top coating (paint layer Sl) as a top view. In this case, a preferred layer thickness was chosen. You can see that there are neither problems with the surface grease barrier (right and left of the bend) nor with the bend resistance (no grease penetration in the bend and in the edge area of the bend).
  • Figure 7 shows various packaging forms according to the invention with A:A sealing.
  • Figure 8 shows an envelope packaging according to the invention with A:B sealing on the front side.
  • Figure 9 shows a schematic representation of a graph of a typical DMTA measurement for a barrier paper according to the invention. There will be in Depending on the temperature, the measured values for the loss factors tan delta are plotted. As the temperature increases, there is first a maximum at the temperature Tg and then a first turning point at the temperature Tw.
  • Figure 10 shows a DMTA measurement for Examples 9 and 10 according to the invention in comparison with Comparative Example V2 according to Table 2.
  • the following coatings were applied to a base paper with a basis weight of 60 g/m 2 or 70 g/m 2 and each with 40% long fiber and 60% short fiber content, using 100% virgin fiber pulp.
  • the primer contains 75.9% pigment (phyllosilicate), 22.8% latex (styrene-acrylate latex) and 1.3% rheology modifiers (0.2% acrylate-based thickener, 1.1% zirconium-based crosslinker).
  • the primer was applied to the base paper using a squeegee (blade).
  • Examples 1 to 5 polyvinyl alcohols were used as polymers.
  • Examples 6 to 8 partially saponified polyethylene vinyl alcohols were used as polymers.
  • the coating layer Sl of Examples 1 to 5 comprises a pure polymer coating.
  • Example 1' includes a polymer coating with 99.8% polyvinyl alcohol as polymer (Example 1; degree of saponification: 87%; M w : 50900) and 0.2% rheology modifiers (Na docusate).
  • the coating layer Sl of Examples 9 and 10 and Comparative Examples 1, 2, 3, and 5 corresponds to the coating layer Sl of Examples 1.
  • the use of the coating layer Sl of Example 1' led to comparable results.
  • Embodiment using gravure printing and embodiment using curtain coating The following properties were examined:
  • Area or application weights Application weight of the coatings in g/m 2 . This is determined by differential weighing between coated and uncoated papers.
  • Viscosity The viscosity was determined using a Brookfield viscometer at 23°C and a speed of 100 rpm, with a dry content of 4%.
  • WVTR Water vapor transmission rate, determined according to ASTM D 1653. For bent samples, a bend of 180° is created with a roller that exerts a load of 330 g / cm on the resulting bend and in which the coating is on the inside (inside bend) or outside (outside bend).
  • OTR Oxygen transmission rate, determined according to DIN 15105-2
  • a 180° bend is created with a roller that applies a load of 330 g/cm to the resulting bend and where the coating can be on the inside (inside bend) or outside (outside bend).
  • HVTR Hexane vapor transmission rate.
  • n-hexane is filled into a beaker (solvent-resistant), sealed tightly with the test specimen and the weight loss is monitored over time.
  • a bend of 180° is created with a roller, which places a load of 330 g/cm on the resulting bend and where the coating can be located on the inside (inside bend) or outside (outside bend).
  • Palm kernel fat test Analogous to DIN 53116. For bent samples, a bend of 180° is created with a roller which exerts a load of 330 g/cm on the resulting bend and where the coating can be on the inside (inside bend) or outside (outside bend). .
  • Display paper Evaluation of the display paper mentioned in DIN 53116. Grease penetration points with a diameter (d) of ⁇ 1 mm (first value in the table) and of > 1 mm (second value in the table) are counted.
  • Sample paper Evaluation of the back of the sample paper mentioned in DIN 53116. This is not part of the standard, but was carried out for better differentiation.
  • Sealing seam strength The samples are sealed at 3.3 bar for 0.3 seconds in the temperature range from 100°C to 220°C across the direction of paper travel and the sealing seam strength is determined according to DIN 55529 (2012).
  • the optimal sealing temperature and, for comparison, the sealing force at 150 ° C (optimal sealing temperature of Example 1) are given.
  • Coefficients of friction The static and kinetic coefficients of friction were determined according to ISO 8295.
  • the DSC curves were recorded with a Mettler DSC 20 S in cold-welded aluminum crucibles and perforated lids.
  • the heating rates were 10 K/min in the range between 30°C and 280°C.
  • the melting temperatures were determined via the peak minima of the melting process. Necessary?
  • Friction sensitivity 1 Measure the barrier properties of the upper barrier paper
  • Table 1 shows the results for intermediate products that only have the coating layer S1 but no barrier layer B1 and no
  • Table 2 shows the results for barrier papers according to the invention, which in particular have a coating layer Sl, a barrier layer B1 and a coating B2 (Examples Ex. 9 and Ex. 10), as well as the comparative examples VI to V5.
  • the partially saponified polyvinyl alcohols used have very low hexane and oxygen transmission rates. This is probably due to their relatively high hydrophilicity.
  • the polyvinyl alcohols with a higher degree of saponification are characterized by a higher viscosity in the coating color with the same dry content. This only makes sense from a chemical perspective, as the higher polarity means that each molecule has a stronger interaction with the surrounding solvent (water).
  • the water vapor permeability of the polyethylene vinyl alcohols examined is lower than that of the polyvinyl alcohols, which is probably due to the ethylene content and the associated lower hydrophilicity.
  • PVOH polyvinyl alcohols
  • the barrier papers according to all exemplary embodiments of the invention have the following: a) For all barrier papers according to these examples, the values for the loss factors tan delta measured using dynamic mechanical thermal analysis (DMTA) of the barrier papers as a function of the temperature pass through a maximum at the temperature Tg and a first turning point at the temperature Tw as the temperature increases. b ) For all barrier papers according to these examples, the temperature Tg is also lower than the temperature Tw. c) The amount of the difference between tan delta at temperature Tg and tan delta at temperature Tw is > 0.013 for all barrier papers according to these examples.
  • DMTA dynamic mechanical thermal analysis
  • DMTA Dynamic mechanical thermal analysis
  • Dynamic mechanical thermal analysis also provides the glass transition temperature (Tg) - the temperature at which the macromolecule polymer chains transition from a solid, frozen state to a mobile state, but before the macromolecule polymer chains slide past each other, which is the melting point ( Tm) is. It is advantageous if there is an elastic state in a barrier paper in order to maintain a barrier after folding - therefore a Tg below the operating and use temperature is ideal.
  • the Tg in DSC is determined by the temperature at which the tan delta reaches a maximum.
  • Tg 8.4 ° C corresponding to the tan delta maximum of 0.099 and a tan delta change of 0.0185.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Composite Materials (AREA)
  • Laminated Bodies (AREA)
  • Paper (AREA)

Abstract

La présente invention concerne un papier barrière comprenant au moins : - un papier support, - au moins une couche de sauce de couchage S1 appliquée indirectement ou directement sur le papier support, - au moins une couche barrière B1 appliquée indirectement ou directement sur la couche de sauce de couchage S1, - un revêtement B2 appliqué indirectement ou directement sur la couche barrière B1.
PCT/EP2023/059786 2022-04-14 2023-04-14 Papier barrière WO2023198889A1 (fr)

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US6444750B1 (en) 1995-03-06 2002-09-03 Exxonmobil Oil Corp. PVOH-based coating solutions
WO2010037906A1 (fr) * 2008-10-03 2010-04-08 Oy Keskuslaboratorio - Centrallaboratorium Ab Produit fibreux possédant une couche barrière et procédé de production associé
WO2010042162A1 (fr) * 2008-10-10 2010-04-15 Dow Global Technologies, Inc. Revêtement multicouche pour substrat à base de papier
WO2010129032A1 (fr) 2009-05-06 2010-11-11 Inmat Inc. Revêtements barrières postérieurement traités au moyen de cations métalliques polyvalents
EP2872330A1 (fr) * 2012-07-05 2015-05-20 UPM-Kymmene Corporation Emballage pour denrées alimentaires
WO2020109401A1 (fr) 2018-11-27 2020-06-04 Billerudkorsnäs Ab Procédé de formation d'une couche formant barrière à base de pvoh sur un substrat
WO2021023661A1 (fr) 2019-08-02 2021-02-11 Ar Metallizing N.V. Produits formant barrière à wvtr multicouche métallique sur des substrats à base biologique perméables à la vapeur d'eau et à l'oxygène
WO2021251449A1 (fr) 2020-06-10 2021-12-16 日本製紙株式会社 Matériau de base en papier à dépôt en phase vapeur
WO2021260043A1 (fr) 2020-06-23 2021-12-30 Sappi Netherlands Services B.V. Papier ou carton protecteur

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DE10196052T1 (de) 2000-04-11 2003-02-27 Mitsubishi Paper Mills Ltd Verfahren zur Herstellung eines Informationsaufzeichnungsmaterial und Beschichtungslösungen zur Verwendung in diesem Material

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Publication number Priority date Publication date Assignee Title
US6444750B1 (en) 1995-03-06 2002-09-03 Exxonmobil Oil Corp. PVOH-based coating solutions
WO2010037906A1 (fr) * 2008-10-03 2010-04-08 Oy Keskuslaboratorio - Centrallaboratorium Ab Produit fibreux possédant une couche barrière et procédé de production associé
WO2010042162A1 (fr) * 2008-10-10 2010-04-15 Dow Global Technologies, Inc. Revêtement multicouche pour substrat à base de papier
WO2010129032A1 (fr) 2009-05-06 2010-11-11 Inmat Inc. Revêtements barrières postérieurement traités au moyen de cations métalliques polyvalents
EP2872330A1 (fr) * 2012-07-05 2015-05-20 UPM-Kymmene Corporation Emballage pour denrées alimentaires
WO2020109401A1 (fr) 2018-11-27 2020-06-04 Billerudkorsnäs Ab Procédé de formation d'une couche formant barrière à base de pvoh sur un substrat
WO2021023661A1 (fr) 2019-08-02 2021-02-11 Ar Metallizing N.V. Produits formant barrière à wvtr multicouche métallique sur des substrats à base biologique perméables à la vapeur d'eau et à l'oxygène
WO2021251449A1 (fr) 2020-06-10 2021-12-16 日本製紙株式会社 Matériau de base en papier à dépôt en phase vapeur
WO2021260043A1 (fr) 2020-06-23 2021-12-30 Sappi Netherlands Services B.V. Papier ou carton protecteur

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