EP4359604B1 - Blattförmiges produkt und verfahren zu dessen herstellung - Google Patents

Blattförmiges produkt und verfahren zu dessen herstellung

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Publication number
EP4359604B1
EP4359604B1 EP22757981.0A EP22757981A EP4359604B1 EP 4359604 B1 EP4359604 B1 EP 4359604B1 EP 22757981 A EP22757981 A EP 22757981A EP 4359604 B1 EP4359604 B1 EP 4359604B1
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EP
European Patent Office
Prior art keywords
coating layer
polymer
sheet
coating
melting point
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.)
Active
Application number
EP22757981.0A
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English (en)
French (fr)
Other versions
EP4359604A1 (de
Inventor
Stefan Kuni
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Mm Kotkamills Oy
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Mm Kotkamills Oy
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Application filed by Mm Kotkamills Oy filed Critical Mm Kotkamills Oy
Publication of EP4359604A1 publication Critical patent/EP4359604A1/de
Application granted granted Critical
Publication of EP4359604B1 publication Critical patent/EP4359604B1/de
Active legal-status Critical Current
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Classifications

    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H19/00—Coated paper; Coating material
    • D21H19/80—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
    • D21H19/10—Coatings without pigments
    • D21H19/14—Coatings without pigments applied in a form other than the aqueous solution defined in group D21H19/12
    • D21H19/24—Coatings without pigments applied in a form other than the aqueous solution defined in group D21H19/12 comprising macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
    • D21H19/28—Polyesters
    • 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
    • D21H19/36—Coatings with pigments
    • D21H19/44—Coatings with pigments characterised by the other ingredients, e.g. the binder or dispersing agent
    • D21H19/56—Macromolecular organic compounds or oligomers thereof 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
    • 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 sheet-like product and to a method for its manufacture according to preambles of the enclosed independent claims.
  • Cellulosic fibre based materials such as paper and board, are conventionally used for packaging various goods, including foodstuffs and beverages, as well as for disposable articles, such as cups, tableware and the like.
  • the use of cellulosic fibre based materials is increasing, as there is a general desire to decrease or completely replace fossil fuel based plastics in packaging applications.
  • the need to find sustainable and renewable packaging solutions is expanding the use of paper and board even to new areas, as the businesses and consumers become more aware about sustainability and environmental impact of the product packaging.
  • Coating layers and/or surface size layers are applied on the surface of the paper and board in order to produce protective barrier layers, for example, against grease, water, water vapour, oxygen, aroma and/or mineral oil.
  • protective barrier layers for example, against grease, water, water vapour, oxygen, aroma and/or mineral oil.
  • Many of the conventional barrier layers are applied to the surface by extrusion or glue lamination, and they usually comprise one or more polymers which form a protective film on the surface of the paper or board, and prevents the interaction between the packaged goods and the environment.
  • Crystalline polymers i.e. polymers with a high degree of crystallinity
  • Crystalline polymers are generally known to be harder and more brittle than semi-crystalline or non-crystalline amorphous polymers.
  • Surface layers comprising hard and brittle polymers easily break during folding, creasing and other converting steps, when the coated cellulosic substrate is formed into a final product. The damage caused to the surface layer during such converting steps will make the surface layer leak and reduce its barrier properties, as the layer will be easily penetrated by the grease, water, oxygen, etc.
  • the higher degree of crystallinity usually also increases the film forming and melting temperature of the polymer, which makes their processability more demanding.
  • polymers with a low degree of crystallinity would be advantageous in surface treatment of paper, board or the like.
  • a low degree of crystallinity is, however, known to reduce the barrier properties of the final coating or surface sizing layer.
  • use of amorphous polymers can make surface layers tacky, which easily leads to contamination of the processing equipment, such as leading rolls, fabrics and other machine elements.
  • Amorphous polymers with low melting temperatures may also increase undesired blocking tendency of the coated paper or board, i.e. they cause unwanted sticking of the material to itself during winding and storage.
  • biobased and/or biodegradable components there is an increasing trend and desire to use biobased and/or biodegradable components in manufacture of various products. This trend applies also to materials which are used for packaging of goods, especially with growing desired to reduce petroleum-based materials and the awareness of microplastics and their harmful effects to living organisms.
  • suitable biobased and/or biodegradable polymers show a low degree of crystallinity, increasing the blocking tendency of the coated paper.
  • WO 2014/064335 discloses a method for manufacturing biodegradable packaging material.
  • a multilayer coating comprising innermost and outermost layers of a blend comprising 20 - 95 weight-% of a higher melt index polylactide and 5 - 80 weight-% of another biodegradable polymer and a middle layer containing a lower melt index polylactide alone is coextruded onto a fibrous substrate.
  • the object of the present invention is to minimize or even eliminate the problems existing in the prior art.
  • One non-limiting object of the present invention is to provide a sheet-like product which has good barrier properties, and which is easy to produce and process, even when a biobased and/or biodegradable polymer is used for providing at least one coating layer.
  • a further non-limiting object of the present invention is to provide a method for manufacturing a coated sheet-like product without problems associated with surface layer tackiness.
  • a typical sheet-like product according to the present invention such as paper, board or the like, is defined in claim 1 and comprises, inter alia,
  • a typical method according to the present invention for making a sheet-like product according to the invention is defined in claim 13 and comprises, inter alia,
  • the second coating layer which forms the surface of the coated product, has a higher crystallization degree and/or melting point temperature than the biobased and/or biodegradable first polymer of the coating layer underneath.
  • the first polymer which is a biobased and/or biodegradable polymer with a lower crystallization degree and/or melting point, can be protected by a second coating layer, while it provides the first layer with the desired elasticity for the barrier coating.
  • biobased polymer denotes a polymer which is produced from renewable nature derived raw materials directly or using mass-balance approach, excluding petroleum based raw materials.
  • Biobased polymers comprise polymers derived from polysaccharides, such as sugar-based biopolymers, starch-based biopolymers, and cellulose-based biopolymers; polymers derived from proteins or lipids, as well as polymers obtained from microbiologically produced material, such as polyesters.
  • Biobased polymers suitable for use in the present invention are preferable biodegradable.
  • biodegradable polymer encompasses both biobased polymers and petroleum-based polymers as long as they are degradable by biological activity, e.g. by microorganisms, such as bacteria, fungi, algae, and/or enzymes, with the degradation accompanied by a lowering of the molar mass of the original polymer.
  • the degradation products are non-toxic and environmentally acceptable, usually carbon dioxide, water and inorganic compounds.
  • biodegradable polymers in the present context are compostable.
  • crystallization degree is understood as the ratio between crystalline and amorphous parts of the polymer.
  • crystallization degree can be determined by using differential scanning calorimetry (DCS), according to standard ISO 11357-1:2016.
  • the first polymer is selected from biodegradable polyesters, such as polybutylene succinate, poly(butylene succinate-co-adipate), polyhydroxyalkanoates, polycaprolactones, polylactides, any of their mixtures and their copolymers.
  • the first polymer may also be a copolymer of two or more said polyesters, or a mixture of two or more said polyesters.
  • the first polymer may be a polyhydroxyalkanoate, such as polyhydroxybutyrate, polyhydroxyvalerate, polyhydroxyhexanoate or any of their copolymers.
  • the first polymer has a melting point in a range of 50 - 120 °C, preferably 60 - 110 °C.
  • the melting point can be determined by using differential scanning calorimetry (DCS), according to standard ISO 11357-1:2016.
  • DCS differential scanning calorimetry
  • the melting point of the first polymer provides optimal flexibility for the barrier layer and minimises the risk of leakage through cracking of the barrier layer.
  • the first polymer has a glass transition temperature T g ⁇ 0 °C, for example in a range from -40 °C to 0 °C.
  • the glass transition temperature of the first polymer is lower than the first melting point temperature.
  • the glass transition temperature can be determined by using differential scanning calorimetry (DCS), according to standard ISO 11357-1:2016.
  • the second polymer may be a thermoplastic elastomer.
  • the second polymer is selected from a group comprising polyesters, such as polybutylene succinate, poly(butylene succinate-co-adipate), polyhydroxyalkanoates, polylactide or polycaprolactone; polyethyleneterephtalate; polyolefins, such as polyethylene or polypropylene; styrene acrylate copolymers; styrene butadiene copolymers; ethylene acrylic and methacrylic acid copolymers; poly(glycolic acid); butyl vinyl alcohol, polyvinyl alcohol; ethylene vinyl acetate and chitosane.
  • polyesters such as polybutylene succinate, poly(butylene succinate-co-adipate), polyhydroxyalkanoates, polylactide or polycaprolactone
  • polyethyleneterephtalate such as polyethylene or polypropylene
  • styrene acrylate copolymers such as polyethylene or polypropylene
  • the second polymer may be selected from biobased and/or biodegradable polyesters, such as polybutylene succinate, poly(butylene succinate-co-adipate), polyhydroxyalkanoate, polycaprolactone or polylactide.
  • the second polymer may also be a copolymer of two or more said polyesters, or a mixture of two or more said polyesters.
  • the second polymer may be a polyhydroxyalkanoate, such as polyhydroxybutyrate, polyhydroxyvalerate, polyhydroxyhexanoate or any of their copolymers.
  • the second polymer has a melting point in a range of 120 - 180 °C, preferably 80 - 170 °C or 80 - 140 °C.
  • the melting point of the second polymer provides the coating with required flexibility while minimising the risk of blocking.
  • the melting point of the second polymer also enables secure heat sealing of the sheet-like product, e.g. for manufacture of packages, hot and/or cold cups and the like.
  • the second polymer has a glass transition temperature T g ⁇ 20 °C, for example in a range from 20 °C to 100 °C , preferably from 20 °C to 40 °C.
  • the glass transition temperature of the second polymer is lower than the second melting point temperature.
  • the glass transition temperature can be determined by using differential scanning calorimetry (DCS), according to standard ISO 11357-1:2016.
  • the first polymer and the second polymer may be different from each other.
  • the second polymer may be a non-biodegradable and/or non-biobased polymer.
  • the first polymer and second polymer are both biobased and/or biodegradable polymers. In this manner it is possible to maximize the amount of biobased and/or biodegradable polymer the barrier coating.
  • the first polymer and second polymer may both be biobased and/or biodegradable polymers and they may be formed from same structural monomer units, as long as the second crystallization degree and/or the second melting point of the second polymer are higher than the first crystallization degree and/or the first melting point of the first polymer.
  • Use of first and second polymer formed from same structural monomers units decreases the risk of repulsion and delamination between the different coating layers.
  • the crystallization degree of the second polymer is higher than the crystallization degree of the first polymer.
  • the second coating layer may comprise a crystallization promoter.
  • the crystallization promoter may be finely-divided inorganic particle, such as mica or talc, or an organic salt, such as sodium benzoate.
  • the crystallization promoter may provide effective nucleation and increase crystallization speed in the second coating layer during drying. Furthermore, use of crystallization promoter may generally improve the crystallization process in the second coating layer and reduce the operating challenges.
  • the coating layer preferably comprises a crystallization promoter.
  • the first coating layer and/or the second coating layer may further comprise inorganic mineral particles.
  • the inorganic mineral particles may be selected from kaolin, talc, mica, calcium carbonate or any mixture thereof. Inorganic mineral particles may improve the barrier properties achieved.
  • the first coating layer and/or the second coating layer may comprise ⁇ 50 weight-%, preferably ⁇ 25 weight-%, of inorganic mineral particles.
  • the first coating layer and/or the second coating layer may comprise inorganic mineral particles in amount of 5 - 50 weight-%, preferably 10 - 25 weight-%, calculated from the dry weight of the coating layer.
  • the first coating layer and/or second coating layer comprising inorganic mineral particles may be in form of an aqueous dispersion having solids content of 20 - 65 weight-%, preferably 30 - 60 weight-%, at the time of application.
  • the amount of inorganic mineral particles in the first coating layer is higher than the amount of inorganic mineral particles in the second coating layer.
  • the second coating layer is free of inorganic mineral particles.
  • barrier coating with at least a first coating layer and a second coating layer that provides a barrier layer for grease, water, water vapour transmission, oxygen transmission, aroma and/or mineral oil.
  • the sheet-like product is especially suitable for use in food and beverage packaging.
  • the substrate for the sheet-like product comprises cellulosic fibres.
  • the cellulosic fibres may be fibres obtained by chemical or mechanical pulping, or recycled fibres, or any mixture thereof.
  • the substrate may be paper, board or the like.
  • the substrate is usually in form of a moving cellulosic web, having a first large surface and a second large surface, which are parallel with each other.
  • the substrate may have a basis weight or grammage from 40 g/m 2 to 550 g/m 2 , preferably from 80 g/m 2 to 450 g/m 2 .
  • the substrate may have a basis weight or grammage from 175 g/m 2 to 400 g/m 2 , more preferably from 175 g/m 2 to 350 g/m 2 .
  • the substrate may have a basis weight from 40 g/m 2 to 200 g/m 2 , preferably from 60 g/m 2 to 120 g/m 2 .
  • At least a first coating layer and a second coating layer are applied simultaneously by curtain coating on the first large surface of the substrate, without an intermediate drying between the first coating layer and the second coating layer.
  • the first and the second coating layer can be applied as aqueous dispersions or aqueous emulsions comprising the respective polymer.
  • the coating layers are applied simultaneously from different, separate, slots. The laminar flows of the coating compositions from the different coating slots enable immiscibility of the applied coating layers.
  • the first coating layer and the second coating layer are subjected to impingement drying with hot air for increasing the temperature of the second coating layer over the second melting point.
  • the impingement drying with hot air ensures that the water is removed from the coating layers by heat transfer, which takes place from the outside inwards and the outer surface of second coating layer will be in direct contact with the hot drying air. This enables the formation of a temperature gradient through the coating layer.
  • the second polymer in the second coating layer preferably rapidly reaches its melting point temperature for film forming. When the temperature of the second coating layer reaches the melting point of the second polymer, the temperature of the first layer may have at least partially increased over the melting point of the first polymer, as it is lower than the melting point of the second polymer.
  • the more slowly crystallizing first polymer in the first coating layer will eventually reach its film forming temperature, without disturbing the process by its tackiness, since the first coating layer is protected by the second coating layer with the faster crystallizing second polymer, providing a non-tacky outer surface for the applied barrier coating.
  • the temperature of the hot air in impingement drying may be at least 300 °C, preferably at least 400 °C, even more preferably at least 425 °C. High air temperatures in the impingement drying ensure fast crystallization of the second layer and minimize the risks for process problems caused by tacky coating surface.
  • the temperature of the hot air in impingement drying may be adjusted according to the travel speed of the web to be coated. The higher the travel speed, the higher the temperature of the hot air should be in order to guarantee that the temperature of the second coating layer is increased over the second melting point.
  • the second coating layer forms the surface of the sheet-like product.
  • the crystallization degree of the second polymer is higher than the crystallization degree of the first polymer. In this manner it is possible to ensure that the surface of coated web does not contaminate process equipment during further processing.
  • the sheet-like product may comprise two or more first coating layers. It is possible to apply more than one first coating layers simultaneously by curtain coating.
  • the first polymers in the two or more first coating layers may be different from each other, or identical to each other, but each first polymer has first crystallization degree and/or first melting point, which is lower than the second crystallization degree and/or the second melting point of the second polymer in the second coating layer.
  • the first coating layer preferably has a higher coat weight than the second coating layer.
  • the first coating layer may have a coat weight ⁇ 3 g/m 2 , preferably ⁇ 5 g/m 2 .
  • the first coating layer has the coat weight in a range of 3 - 15 g/m 2 , preferably 5 - 12 g/m 2 , more preferably 5 - 10 g/m 2 . It is possible to apply a relatively thick first coating layer, as it is protected by the second coating layer.
  • the second coating layer may have a coat weight ⁇ 6 g/m 2 , preferably ⁇ 5 g/m 2 or ⁇ 3 g/m 2 .
  • the second coating layer has the coat weight in a range of 0.5 - 6 g/m 2 , preferably 1 - 5 g/m 2 , more preferably 1 - 3 g/m 2 .
  • the coat weight of the second coating layer is preferably as thin as possible to enable a fast film forming and crystallization, while still enabling a formation of a uniform coating layer on top of the first coating layer.
  • the sheet-like product may comprise at least one precoat layer arranged between the surface of the substrate and the first coating layer of the barrier coating. This means that at least one precoat layer is applied on the surface of the substrate before forming the barrier coating.
  • the precoat layer(s) reduce(s) the penetration of the first coating material into the cellulosic fibre web by sealing or closing the web surface and improves the coating hold-out.
  • the precoat layer(s) may be applied by any conventional coating technique used in manufacture of paper and board. According to one preferable embodiment the precoat layer(s) may be applied by using a size press, a metered size press, a rod or blade coater. After the application the precoat layer(s) is/are preferably dried before the application of the first and the second coating layer. The drying may be performed by using an air dryer, infrared dryer, cylinder dryers or any combination of these.
  • the precoat layer or one of the precoat layers may comprise a film forming natural or synthetic polymer, such as starch; a cellulose derivative, such as carboxymethyl cellulose or hydroxyethyl cellulose; and/or polyvinyl alcohol.
  • the precoat layer may be thin, while it still effectively closes the surface of the substrate.
  • the coat weight of the precoat layer may be ⁇ 5 g/m 2 , preferably ⁇ 4 g/m 2 or ⁇ 3 g/m 2 .
  • the coat weight of the precoat layer may be in a range of 0.3 - 15.0 g/m 2 , preferably 0.3 - 5.0 g/m 2 , more preferably 0.5 - 4 g/m 2 , even more preferably 0.5 - 3.0 g/m 2 or 1.0 - 2.0 g/m 2 .
  • the precoat layer or one of the precoat layers may comprise inorganic mineral particles.
  • the inorganic mineral particles may be selected from calcium carbonates, clay, talc, mica, kaolin or titanium dioxide. More preferably, the inorganic mineral filler particles may be selected from kaolin, talc, mica, calcium carbonates, such as ground calcium carbonate or precipitated calcium carbonate, or any mixture thereof.
  • the precoat layer comprises further a binder, which binds the inorganic mineral particles to the precoat layer and to the substrate surface.
  • the binder may be a synthetic polymer latex, such as styrene acrylate latex, styrene butadiene latex or polyvinyl acetate latex; polyvinyl alcohol; starch; or carboxymethyl cellulose.
  • the precoat layer may have a coat weight ⁇ 30 g/m 2 , preferably ⁇ 20 g/m 2 , more preferably ⁇ 15 g/m 2 .
  • the precoat layer comprising inorganic mineral particles may have a coat weight in a range of 4 - 30 g/m 2 , even more preferably 4 - 20 g/m 2 , more preferably 5 - 15 g/m 2 .
  • the substrate is subjected to calendering after application of precoat layer.
  • Calendering after application of the precoat improves the sealing and closure of the substrate surface by mechanically pressing the precoat layer at least partially within the substrate. Calendering reduces the porosity and improve the smoothness of the precoated substrate surface.
  • Any suitable calendering unit may be used. Typical calendering units suitable for this purpose are heated or unheated, single or multinip, calenders with hard or soft rolls, shoe nip or metal belt calenders.
  • one or more intermediate layers are arranged between the first coating layer and the second coating layer.
  • the optional intermediate layers are applied simultaneously with the first coating layer and the second coating layer by curtain coating without any intermediate drying.
  • the intermediate layer(s) may provide the formed coating with further functional properties, and/or improve its barrier properties.
  • the second coating layer is arranged directly on the first coating layer without any intermediate layers.
  • the cooling unit cools the coated web before winding into the jumbo reel.
  • An appropriate reaction time should, however, be allowed between the impingement drying and the cooling unit, in order to allow desired film forming and crystallization in the coated layers, especially in the first coating layer.
  • the cooling unit reduces the blocking risk during winding and the following storage.
  • the method according to present invention is suitable for both on-line and off-line application.

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Claims (15)

  1. Blattartiges Produkt, wie Papier, Karton oder dergleichen, umfassend
    - ein Substrat, das Zellulosefasern umfasst und eine erste große Oberfläche aufweist, wobei mindestens eine erste Beschichtungsschicht mit einem Beschichtungsgewicht im Bereich von 3-15 g/m2 und eine zweite Beschichtungsschicht mit einem Beschichtungsgewicht im Bereich von 0,5-6 g/m2 durch Vorhangbeschichtung auf die erste große Oberfläche des Substrats aufgebracht werden, um eine Barrierebeschichtung zu bilden, wobei die zweite Beschichtungsschicht die Oberfläche des blattartigen Produkts bildet,
    - die erste Beschichtungsschicht ein erstes Polymer umfasst, das einen ersten Kristallisationsgrad und eine Glasübergangstemperatur Tg ≤0 °C sowie einen ersten Schmelzpunkt in einem Bereich von 50-120 °C aufweist, und
    - die zweite Beschichtungsschicht ein zweites Polymer umfasst, das einen zweiten Kristallisationsgrad und eine Glasübergangstemperatur Tg ≥20 °C sowie einen zweiten Schmelzpunkt in einem Bereich von 120-180 °C aufweist, wobei der Schmelzpunkt und die Glasübergangstemperatur mit Hilfe der Differentialscanningkalorimetrie (DCS) nach der Norm ISO 11357-1:2016 bestimmt wird, wobei das erste Polymer aus biologisch abbaubaren Polyestern ausgewählt ist und das zweite Polymer aus einer Gruppe ausgewählt ist, bestehend aus Polyestern; Polyethylenterephthalat; Polyolefinen; Styrol-Acrylat-Copolymeren; Styrol-Butadien-Copolymeren; Ethylen-Acryl- und Methacrylsäure-Copolymeren; Poly(glykolsäure); Butylvinylalkohol; Polyvinylalkohol; EthylenVinylacetat; und Chitosan, und
    wobei der zweite Kristallisationsgrad und/oder der zweite Schmelzpunkt des zweiten Polymers höher ist als der erste Kristallisationsgrad und/oder der erste Schmelzpunkt des ersten Polymers.
  2. Blattartiges Produkt nach Anspruch 1, dadurch gekennzeichnet, dass das erste Polymer ein biologisch abbaubarer Polyester ist, ausgewählt aus Polybutylensuccinat, Poly(butylensuccinat-co-adipat), Polyhydroxyalkanoaten, Polycaprolactonen, Polylactiden, beliebigen ihrer Mischungen und Copolymeren.
  3. Blattartiges Produkt nach Anspruch 2, dadurch gekennzeichnet, dass das erste Polymer ein Polyhydroxyalkanoat ist, wie Polyhydroxybutyrat, Polyhydroxyvalerat, Polyhydroxyhexanoat oder eines ihrer Copolymere.
  4. Blattartiges Produkt nach einem der vorstehenden Ansprüche 1 bis 3, dadurch gekennzeichnet, dass der Kristallisationsgrad des zweiten Polymers höher ist als der Kristallisationsgrad des ersten Polymers.
  5. Blattartiges Produkt nach einem der vorstehenden Ansprüche 1 bis 4, dadurch gekennzeichnet, dass die erste Beschichtungsschicht ein Beschichtungsgewicht im Bereich von 5-12 g/m2, vorzugsweise 5-10 g/m2, aufweist und/oder die zweite Beschichtungsschicht ein Beschichtungsgewicht im Bereich von 1-5 g/m2, vorzugsweise 1-3 g/m2, aufweist.
  6. Blattartiges Produkt nach einem der vorstehenden Ansprüche 1 bis 5, dadurch gekennzeichnet, dass das blattartige Produkt mindestens eine Vorbeschichtungsschicht umfasst, die zwischen der Oberfläche des Substrats und der ersten Beschichtungsschicht der Barrierebeschichtung angeordnet ist.
  7. Blattartiges Produkt nach Anspruch 6, dadurch gekennzeichnet, dass die Vorbeschichtungsschicht ein natürliches oder synthetisches Polymer, wie Stärke, ein Cellulosederivat, wie Carboxymethylcellulose oder Hydroxyethylcellulose, und/oder Polyvinylalkohol umfasst.
  8. Blattartiges Produkt nach Anspruch 6, dadurch gekennzeichnet, dass die Vorbeschichtungsschicht ein Beschichtungsgewicht von 0,3-15 g/m2, vorzugsweise 0,3-5 g/m2, besonders bevorzugt 0,5-4 g/m2 aufweist.
  9. Blattartiges Produkt nach einem der Ansprüche 7 bis 8, dadurch gekennzeichnet, dass die Vorbeschichtungsschicht anorganische Mineralpartikel umfasst.
  10. Blattartiges Produkt nach einem der Ansprüche 1 bis 9, dadurch gekennzeichnet, dass die erste Beschichtungsschicht und/oder die zweite Beschichtungsschicht anorganische Mineralpartikel, vorzugsweise ≤50 Gew.-%, vorzugsweise ≤25 Gew.-%, anorganische Mineralpartikel umfasst.
  11. Blattartiges Produkt nach einem der vorstehenden Ansprüche 1 bis 10, dadurch gekennzeichnet, dass eine oder mehrere Zwischenschichten zwischen der ersten Beschichtungsschicht und der zweiten Beschichtungsschicht angeordnet sind.
  12. Blattartiges Produkt nach einem der vorstehenden Ansprüche 1 bis 11, dadurch gekennzeichnet, dass die zweite Beschichtungsschicht einen Kristallisationsförderer umfasst.
  13. Verfahren zur Herstellung eines blattartigen Produkts nach einem der Ansprüche 1 bis 12, das Verfahren umfassend
    - Bilden einer Barrierebeschichtung, die mindestens eine erste Beschichtungsschicht mit einem Beschichtungsgewicht im Bereich von 3-15 g/m2 und eine zweite Beschichtungsschicht mit einem Beschichtungsgewicht im Bereich von 0,5-6 g/m2 umfasst, auf einer ersten großen Oberfläche eines Substrats, das Zellulosefasern, wie Papier, Pappe oder dergleichen, umfasst, durch gleichzeitiges Aufbringen der ersten Beschichtungsschicht und der zweiten Beschichtungsschicht durch Vorhangbeschichtung auf der ersten großen Oberfläche des Substrats, ohne eine Zwischentrocknung zwischen der ersten Beschichtungsschicht und der zweiten Beschichtungsschicht, wobei die erste Beschichtungsschicht ein erstes Polymer umfasst, das aus biologisch abbaubaren Polyestern ausgewählt ist, die einen ersten Kristallisationsgrad, eine Glasübergangstemperatur Tg ≤0 °C und einen ersten Schmelzpunkt in einem Bereich von 50-120 °C aufweisen, und die zweite Beschichtungsschicht ein zweites Polymer umfasst, das aus einer Gruppe ausgewählt ist, bestehend aus Polyestern; Polyethylenterephthalat; Polyolefinen; Styrolacrylat-Copolymeren; Styrol-Butadien-Copolymeren; Ethylen-Acryl- und Methacrylsäure-Copolymeren; Poly(glykolsäure); Butylvinylalkohol; Polyvinylalkohol; Ethylenvinylacetat; und Chitosan, das einen zweiten Kristallisationsgrad, eine Glasübergangstemperatur Tg ≥20 °C und einen zweiten Schmelzpunkt in einem Bereich von 120-180 °C aufweist, wobei der zweite Kristallisationsgrad und/oder der zweite Schmelzpunkt höher ist als der erste Kristallisationsgrad und/oder der erste Schmelzpunkt des ersten Polymers, wobei die zweite Beschichtungsschicht die Oberfläche des blattartigen Produkts bildet, und
    - Unterziehen der gebildeten Barrierebeschichtung einer Pralltrocknung mit Heißluft zur Erhöhung der Temperatur der zweiten Beschichtungsschicht über den zweiten Schmelzpunkt.
  14. Verfahren nach Anspruch 13, dadurch gekennzeichnet, dass mindestens eine Vorbeschichtungsschicht auf die Oberfläche des Substrats aufgebracht wird, bevor die Barrierebeschichtung gebildet wird.
  15. Verfahren nach Anspruch 13 oder 14, dadurch gekennzeichnet, dass die Temperatur der Heißluft bei der Pralltrocknung mindestens 300 °C, vorzugsweise mindestens 400 °C, noch bevorzugter mindestens 425 °C beträgt.
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