WO2025003946A1 - Matériau d'emballage - Google Patents

Matériau d'emballage Download PDF

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Publication number
WO2025003946A1
WO2025003946A1 PCT/IB2024/056263 IB2024056263W WO2025003946A1 WO 2025003946 A1 WO2025003946 A1 WO 2025003946A1 IB 2024056263 W IB2024056263 W IB 2024056263W WO 2025003946 A1 WO2025003946 A1 WO 2025003946A1
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WO
WIPO (PCT)
Prior art keywords
layer
packaging material
barrier layer
material according
paper
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.)
Ceased
Application number
PCT/IB2024/056263
Other languages
English (en)
Inventor
Luca ZULIANI
Igor ROMANO
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Soremartec SA
Original Assignee
Soremartec SA
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 Soremartec SA filed Critical Soremartec SA
Priority to EP24742311.4A priority Critical patent/EP4735350A1/fr
Priority to CN202480043276.XA priority patent/CN121419925A/zh
Publication of WO2025003946A1 publication Critical patent/WO2025003946A1/fr
Priority to MX2025015271A priority patent/MX2025015271A/es
Anticipated expiration legal-status Critical
Ceased 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
    • 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
    • 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
    • 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
    • D21H11/00—Pulp or paper, comprising cellulose or lignocellulose fibres of natural origin only
    • D21H11/16—Pulp or paper, comprising cellulose or lignocellulose fibres of natural origin only modified by a particular after-treatment
    • D21H11/18—Highly hydrated, swollen or fibrillatable fibres
    • 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
    • D21H19/38—Coatings with pigments characterised by the pigments
    • D21H19/385—Oxides, hydroxides or carbonates
    • 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
    • D21H19/38—Coatings with pigments characterised by the pigments
    • D21H19/40—Coatings with pigments characterised by the pigments siliceous, e.g. clays
    • 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
    • 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
    • D21H19/50—Proteins
    • 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
    • D21H19/52—Cellulose; Derivatives thereof
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H19/00—Coated paper; Coating material
    • D21H19/36—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
    • 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
    • D21H19/60—Polyalkenylalcohols; Polyalkenylethers; Polyalkenylesters
    • 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
    • D21H19/62—Macromolecular organic compounds or oligomers thereof obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H19/00—Coated paper; Coating material
    • D21H19/36—Coatings with pigments
    • D21H19/44—Coatings with pigments characterised by the other ingredients, e.g. the binder or dispersing agent
    • D21H19/64—Inorganic compounds
    • 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
    • D21H27/00—Special paper not otherwise provided for, e.g. made by multi-step processes
    • D21H27/10—Packing paper
    • 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
    • D21H27/30—Multi-ply

Definitions

  • the present invention relates to a multi-layer paper-based packaging material, particularly for use in packaging confectionary products, comprising a paper layer and at least a barrier coating layer.
  • Barrier coatings are required and widely used in food packaging to preserve the food organoleptic properties.
  • Barrier properties for flexible packaging materials include a low permeability to 02 and water vapor, as well as low permeability to volatile aroma compounds and low light permeability.
  • OTR oxygen transmission rate
  • WVTR water vapor transmission rate
  • the purpose of the invention is to provide a multi-layer paper-based packaging material that combines the above-mentioned requirements.
  • FIG. 1 is a schematic sectional representation showing the layout of a plurality of embodiments (a) to (g) of the packaging material, wherein a surface layer of the multi-layer structure has heat sealing properties;
  • FIG. 2 is a schematic sectional representation showing the layout of a plurality of embodiments (a) to (g), wherein the multi-layer structure includes a surface layer having cold sealing properties, and
  • FIG. 3 is a schematic sectional representation of a plurality of exemplified embodiments (a) to (e);
  • FIG. 4 is a schematic sectional representation of a plurality of exemplified embodiments (a) to (e).
  • barrier layer extrusion coated or laminated onto the paper layer 1;
  • the invention relates to packaging materials having a multi-layer structure and comprising a paper-based layer 1, that generally constitutes the core layer of the packaging material, and at least a barrier layer 3, 5 comprising or obtained from sustainable and/or natural materials suitable to provide packagings that are compostable and that achieve higher scorings in the recyclability certification tests.
  • paper layer or “paper-based layer” is intended to mean a layer comprising or consisting essentially of cellulose fibers and includes paperboard and cardboard.
  • a material "comprising" cellulose or cellulose fibers or “consisting essentially of cellulose or cellulose fibers” does not exclude the presence of additives, for example of the type conventionally used in the production of paper or additives functional for obtaining barrier effects to gases and liquids or for improving the mechanical properties.
  • additives for example of the type conventionally used in the production of paper or additives functional for obtaining barrier effects to gases and liquids or for improving the mechanical properties.
  • such terms include the case where the material comprises from 70 to 99.9% by weight of cellulose fibers on an anhydrous basis, preferably from 90 to 99.9% by weight and from 0.1 to 30% by weight on an anhydrous basis of additives, preferably from 0.1 to 10% by weight.
  • Possible additives may include starches, alkyl ketene dimers, resins and inert fillers, such as clays.
  • Recycled cellulose fibers can be used, preferably totally free of MOSH and MO AH.
  • the paper-based layer 1 has a grammage (weight) in the range of from 35 to less than 120 g/m 2 , and is flexible, whereby the multi-layer packaging material is equally flexible; however , the invention includes, within its scope, packaging materials wherein the paper-based layer is a sheet having a weight of from 120 to 400 g/m2 which are suitable to be shaped by heat and pressure to provide shaped packagings.
  • Said barrier coating layer applied on one or both sides of the substrate preferably comprises: from 51 to 99% wt., preferably 90-10% wt., more preferably 95 - 98 % wt. of a polymeric component selected from the group consisting of a polyhydroxyalkanoate polymer (PHA) or copolymer, a proteinaceous material selected from proteins from milk or from vegetables, such as legumes or fungi, or gelatin, polylactic acid, polybutylene succinate or its copolymers, polybutylene adipate terephthalate (PBAT), thermoplastic blends of starch and aliphatic polyesters, chitosan, carrageenan, pectin, alginates, lipids polyacrylic polymers, polyurethane and mixtures thereof, and from 49 to 1% wt., preferably 1-10% wt., more preferably 2-5% wt.
  • PHA polyhydroxyalkanoate polymer
  • PBAT polybutylene adip
  • a filler selected from the group consisting of a layered double hydroxide, nanocellulose, silicates and clays, preferably phyllosilicates, and mixtures thereof, the percentages by weight being referred to 100 parts by weight of the polymeric component and the filler and sum up to 100%.
  • barrier layer indicates a layer that provides a barrier to water vapor, oxygen, aroma or carbon dioxide; it may further provide grease or moisture resistance and/or water absorption resistance. It was found that said barrier layer, as herein described, also enhances the material mechanical properties (e.g., tensile, tear, impact or burst strength). In some embodiments, the disclosed barrier layer also provides a packaging material with the ability to maintain deformation upon twisting, cold forming properties and thermoforming, while keeping the original material properties of the substrate.
  • the packaging material has a barrier layer 3 on both sides of the paper layer and it is extrusion coated or laminated onto the paper layer (fig 1(e), (f) and (g)).
  • the barrier layer identified with 5 in the drawings, is obtained by applying and drying a lacquer comprising one of more of the mentioned polymeric components and the previously disclosed filler or fillers in water or in solvent vehicles (fig. 1(a), 1(b) and 1(d)).
  • said barrier layer 5, obtained from a lacquer is on both sides of the paper layer (fig 1(c)).
  • the multi-layer structure may comprise a barrier coating layer 3 (extrusion coated or laminated onto the paper layer) and a barrier layer 5 obtained from a lacquer on the other side of the paper layer (fig 1(d)).
  • the multi-layer structure may comprise said barrier layer 5, obtained from a lacquer, as described above, above a barrier layer 3 which is extrusion coated or laminated onto the paper layer (fig. 1 (f)) or, if said barrier layer 3 is extrusion coated or laminated onto both sides of the paper layer, said barrier coating layer 5, obtained from a lacquer, may be placed on both extrusion coated or laminated layers (fig. 1 (g)).
  • the polymeric components for use in the barrier layers of the invention are (bio) degradable materials comprising:
  • PHA Polyhydroxyalkanoate
  • poly (hydroxyalkanoate) polyesters that can be used within the scope of the invention include, but are not limited to, poly (3 -hydroxybutyrate) (3HB), poly (4- hydroxybutyrate) (4HB), poly (3- hydroxyvalerate)(3HV); particularly preferred are copolymers of hydroxybutyrate and hydroxy valerate or hydroxyhexanoate which have a melting temperature of 120 to 160 ° C, including poly (3 -hydroxyb utyrate-co-3- hydroxyvalerate) (PHBV), poly (hydroxybutyrate-co-hydroxyhexanoate)(PHBH), poly (3 - hydroxy-co-4-hydroxybutyrate). PHBH and PHBV are preferred.
  • PHAs blends including a PHA, preferably poly(3-hydroxybutyrate-co-4- hydrobutyrate) and biodegradable polymers selected from cellulose, starch or starch acetate, poly(lactic acid), polycaprolactone.
  • PBS Polybutylene succinate
  • suitable copolymers of PBS include: poly(l,4-butylene succinate-co-adipate), poly(l,4-butylene succinate-co-l,4-butylene azelate), poly(l,4-butylene succinate-co-l,4-butylene terephthalate), poly(l,4-butylene succinate-co-l,4-butylene sebacate-co-l,4-butylene terephthalate), poly(l,4-butylene adipate-co-l,4-butylene succinate-co-1,4- butylene terephthalate), poly(l,4-butylene azelate-co-l,4-butylene succinate-co-l,4-butylene terephthalate). Also included are polyhydroxyalkanoate-polybutylene succinate copolymers.
  • a proteinaceous material selected from proteins from milk or from legumes, such as pea and lentil, proteins from fungi or gelatin;
  • pectin pectin, alginates and lipids, optionally in combination with the above-mentioned proteinaceous substances and/or with polysaccharides.
  • polystyrene resin Also included as suitable polymeric components are:
  • polylactic acid thermoplastic blends of starch and aliphatic polyesters, chitosan, and carrageenan.
  • the fillers for use in the barrier coating layers of the invention are selected from layered double hydroxides (LDH), nanocellulose, natural and synthetic phyllosilicates and mixtures thereof.
  • LDH layered double hydroxides
  • Preferred LDH include hydrotalcite and hydrotalcite-like minerals.
  • Preferred nanocellulose materials include cellulose nanofibers (CNF), nanocrystalline cellulose (CNC) or bacterial nanocellulose (BNC); the term nanocellulose also includes nanocellulose modified in the CH2OH groups, for example by esterification or amidation or etherification.
  • Preferred phyllosilicates include montmorillonite bentonite, hectorite, smectite and mica.
  • the adopted fillers typically have a particle size with the following features: One dimension 1-40 micron
  • the barrier coating layers are normally applied in a weight range of from 0.5 to 10 g/m 2 , preferably 1-5 g/m 2 , more preferably 1-3 g/m 2 .
  • the laminated or extrusion coated barrier layer 3 is heat-sealable, in which case the polymeric component is preferably a polyhydroxyalkanoate (as previously described), polybutylene succinate, polybutylene adipate terephthalate or polylactic acid, in combination with a filler which is preferably selected from a layered double hydroxide and nanocellulose.
  • the polymeric component is preferably a polyhydroxyalkanoate (as previously described), polybutylene succinate, polybutylene adipate terephthalate or polylactic acid, in combination with a filler which is preferably selected from a layered double hydroxide and nanocellulose.
  • the polymeric component is selected from the group consisting of proteinaceous materials, preferably selected from milk, fungal and pea proteins, as well as gelatin.
  • a heat sealable layer 7 obtained from a heat sealable lacquer may be applied as an external layer (fig 1 (c)); the polymers for the heat sealable lacquer are the same low melting polymers disclosed for the barrier layer, but this layer 7 does not include a filler.
  • the multilayer packaging material may further include one or more primer layers (not shown in the drawings) that are applied to one or both sides of the paper layer, in between the surface of the paper layer and said barrier coating layers; primer layers may be used to improve the spreading or adhesion of the subsequent coating.
  • Primers for the purpose of the present invention may be selected from the group consisting of acrylic acid copolymers, polyesters, polyhydroxyalkanoates, native and chemically modified starches, xylan and chemically modified xylan, polyvinylidene dichloride, polyvinyl alcohol, ethyl-vinyl alcohol, vinyl acetate, ethyl-vinyl acetates, cellulose nitrate, silanes, polyurethanes, or combinations thereof.
  • a cold sealable layer 9 may be applied as a surface coating, optionally in limited areas of the packaging material.
  • Cold sealable layers are normally formulated from a latex or non-allergenic latex suspension; water-based acrylic or synthetic latex systems could alternatively be used.
  • Cold sealable layers may include additives or pigments (e.g., 0.1-5% by weight relative to the resin).
  • the multi-layer structure includes a surface printed layer 11 that is applied using conventional printing inks and conventional printing techniques, such as offset printing or rotogravure.
  • the printed layer may be further coated with a protective varnish; protective varnishes are applied to protect inks or coatings from damage during the lifetime of the packaging. Damage could occur from moisture or solvent attack or by mechanical stress or abrasion.
  • a protective varnish is applied by the same technology used to apply the printing ink.
  • protective varnishes comprise a resin, additives/stabilizers/modifiers and solvent.
  • Suitable solvents may be water, ethanol, ethyl acetate.
  • Resins can be selected from nitro- or other modified cellulose, acrylic polymers and polyurethane.
  • a release coating layer 13 may be applied to cover the printed layer, on the side of the multi-layer structure opposite to the cold sealable layer, to provide release properties.
  • Release varnishes are applied to facilitate the unwinding of the printing reels and to prevent cold seal from adhering to other parts of the packaging structure.
  • the release varnishes to be considered have the same constituents as a protective varnish but include an additional slip or release agent.
  • Slip or release agent can be selected from silicone-containing compounds, fatty acids or fatty acid esters, vegetable or other plant-based oils, carnauba or other biobased waxes and paraffin waxes.
  • a preferred embodiment of the invention includes a multi-layer packaging material wherein the barrier layer is heat-sealable and comprises: - from 50 to 85% wt., preferably from 50 to 70% wt. of a heat sealable polyhydroalkanoate (PHA),
  • PHA heat sealable polyhydroalkanoate
  • PBS polybutylenesuccinate
  • PLA polylactic acid
  • barrier coating layer is heat-sealable and is laminated or extrusion coated
  • said barrier layer comprises:
  • PHA may be replaced by a proteinaceous material, as previously described.
  • Conventional additives relate to additives that are conventionally included in said plastics materials.
  • the multi-layer structure comprises an extrusion coated layer 15 consisting of a PHA polymer or copolymer, that is applied as a direct coating onto the paper layer, thereby to reduce the paper porosity, (fig 3(c)) and (d)), or onto the barrier layer 3 or 5 (fig 3(d)) or as a primer layer between the paper layer and said barrier layer 3 or 5 (fig 3(e)).
  • an extrusion coated layer 15 consisting of a PHA polymer or copolymer, that is applied as a direct coating onto the paper layer, thereby to reduce the paper porosity, (fig 3(c)) and (d)), or onto the barrier layer 3 or 5 (fig 3(d)) or as a primer layer between the paper layer and said barrier layer 3 or 5 (fig 3(e)).
  • a PHA coating formulation including CNC (or a nanocellulose) is applied to a paper substrate (internal side Fig 3 (a), external side figure 3 (b)), wherein PHA is preferably PHBH and the concentration of nanocellulose in the PHA polymer is 2%.
  • a coating layer obtained from a heat sealable lacquer comprising a biodegradable polyester (PHBH) is applied as a surface layer on the internal side.
  • the multi-layer structure of example 3 is shown in fig 3 (c), together with the weights of the layers; the structure and compositions correspond to that of example 2, wherein, however, the layer from the heat sealable lacquer is replaced by a coated or laminated layer of PHA 15.
  • the PHA layer provides for improved barrier properties and reduces the paper porosity.
  • the use of a heat sealable PHA, such as PHBH is preferred to guarantee the heat-sealing properties.
  • example 4 The multi-layer structure of example 4 is shown in fig 3 (d), together with the weights of the layers; the structure and compositions correspond to that of example 3, wherein, however, an additional extrusion coated layer of PHA is applied onto the PHA and CNC barrier layer.
  • the latter additional PHA layer protects the barrier layer, thus reducing delamination, increasing resistance to break from breaking under mild creasing and increasing resistance to flow packing lines.
  • the multi-layer structure of example 5 is shown in fig 3 (e), together with the weights of the layers; the structure and compositions correspond to that of example 4, wherein, however, the PHA extrusion coated layer 15 is used as a primer between the paper layer 1 and the PHA and nanocellulose barrier layer, thus allowing to reduce its weight from 15 g/m2 to 5 g/m2.
  • the multi-layer structures of examples 1 to 5 allow to achieve an OTR lower than 0.5 cc/m2 24h, measured at 23 °C at 40-50% RH and a water vapor transmission rate (WVTR) lower than 20 g/m2 24 h at 38°C at 90% RH.
  • Examples 6-10 shown in figures 4(a) to (e) relate to multi-layer structures corresponding to those of examples 1 to 5, wherein the paper layer is a sheet having a weight of from 120 to 400 g/m2 thus making the packaging material suitable for forming.

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Dispersion Chemistry (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Inorganic Chemistry (AREA)
  • Laminated Bodies (AREA)
  • Wrappers (AREA)

Abstract

L'invention concerne un matériau d'emballage multicouche compostable et éco-durable comprenant : - une couche de papier (1) et une couche barrière (3, 5) sur l'un ou les deux côtés de la couche de papier, ladite couche barrière comprenant de 51 à 99 % en poids, de préférence de 90 à 10 % en poids, de préférence encore de 95 à 98 % en poids, d'un composant polymère choisi dans le groupe constitué d'un polymère ou copolymère de polyhydroxyalcanoate, de protéines de lait, de champignons ou de légumineuses, d'acide polylactique, de succinate de polybutylène ou de copolymères de succinate de polybutylène, de mélanges thermoplastiques d'amidon et de polyesters aliphatiques, de chitosane, de carraghénane, d'alginates de pectine et de lipides, et de mélanges de ceux-ci, et de 1 à 49 % en poids, de préférence de 1 à 10 % en poids, de préférence encore de 2 à 5 % en poids, d'une charge choisie dans le groupe constitué d'hydroxydes doubles lamellaires, de nanocellulose, de silicates et d'argiles, de préférence de phyllosilicates, et de mélanges de ceux-ci, le pourcentage en poids fait référence à 100 parties en poids du composant polymère et de la charge.
PCT/IB2024/056263 2023-06-28 2024-06-27 Matériau d'emballage Ceased WO2025003946A1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
EP24742311.4A EP4735350A1 (fr) 2023-06-28 2024-06-27 Matériau d'emballage
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US10494493B1 (en) * 2016-05-13 2019-12-03 University Of Georgia Research Foundation, Inc. Nitric oxide-releasing packaging membranes
US20230130087A1 (en) * 2020-05-11 2023-04-27 Constantia Pirk Gmbh & Co. Kg Paper packaging material with improved resuspendability of cellulosic fibres
CA3203630A1 (fr) * 2021-02-22 2022-08-25 Alexey VISHTAL Materiau d'emballage en carton recyclable comprenant une couche barriere metallisee appliquee par metallisation par transfert
WO2022219183A1 (fr) * 2021-04-16 2022-10-20 Soremartec S.A. Matériau d'emballage
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MX2025015271A (es) 2026-02-03
EP4735350A1 (fr) 2026-05-06
CN121419925A (zh) 2026-01-27

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