WO1997038852A1 - A packaging material with an o2 barrier - Google Patents

A packaging material with an o2 barrier Download PDF

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Publication number
WO1997038852A1
WO1997038852A1 PCT/DK1997/000148 DK9700148W WO9738852A1 WO 1997038852 A1 WO1997038852 A1 WO 1997038852A1 DK 9700148 W DK9700148 W DK 9700148W WO 9738852 A1 WO9738852 A1 WO 9738852A1
Authority
WO
WIPO (PCT)
Prior art keywords
coating
packaging material
material according
plastic film
evoh
Prior art date
Application number
PCT/DK1997/000148
Other languages
French (fr)
Inventor
Kirsten Lykke
Original Assignee
Danisco A/S
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 Danisco A/S filed Critical Danisco A/S
Priority to JP9536653A priority Critical patent/JP2000508260A/en
Priority to PL97329282A priority patent/PL329282A1/en
Priority to BR9708623A priority patent/BR9708623A/en
Priority to AU23803/97A priority patent/AU711542B2/en
Priority to EP97919279A priority patent/EP0892718A1/en
Priority to NZ332016A priority patent/NZ332016A/en
Publication of WO1997038852A1 publication Critical patent/WO1997038852A1/en
Priority to NO19984716A priority patent/NO313955B1/en

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/06—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B32B27/08—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/30—Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers
    • B32B27/306—Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers comprising vinyl acetate or vinyl alcohol (co)polymers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/32—Layered products comprising a layer of synthetic resin comprising polyolefins
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/34—Layered products comprising a layer of synthetic resin comprising polyamides
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/36—Layered products comprising a layer of synthetic resin comprising polyesters
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/36—Layered products comprising a layer of synthetic resin comprising polyesters
    • B32B27/365—Layered products comprising a layer of synthetic resin comprising polyesters comprising polycarbonates
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J7/00—Chemical treatment or coating of shaped articles made of macromolecular substances
    • C08J7/04—Coating
    • C08J7/042—Coating with two or more layers, where at least one layer of a composition contains a polymer binder
    • C08J7/0423—Coating with two or more layers, where at least one layer of a composition contains a polymer binder with at least one layer of inorganic material and at least one layer of a composition containing a polymer binder
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J7/00—Chemical treatment or coating of shaped articles made of macromolecular substances
    • C08J7/04—Coating
    • C08J7/043—Improving the adhesiveness of the coatings per se, e.g. forming primers
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J7/00—Chemical treatment or coating of shaped articles made of macromolecular substances
    • C08J7/04—Coating
    • C08J7/048—Forming gas barrier coatings
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2995/00—Properties of moulding materials, reinforcements, fillers, preformed parts or moulds
    • B29K2995/0037—Other properties
    • B29K2995/0081—Tear strength
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/50—Properties of the layers or laminate having particular mechanical properties
    • B32B2307/514—Oriented
    • B32B2307/518—Oriented bi-axially
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/70—Other properties
    • B32B2307/724—Permeability to gases, adsorption
    • B32B2307/7242—Non-permeable
    • B32B2307/7244—Oxygen barrier
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2323/00—Polyalkenes
    • B32B2323/04—Polyethylene
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2323/00—Polyalkenes
    • B32B2323/10—Polypropylene
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2367/00—Polyesters, e.g. PET, i.e. polyethylene terephthalate
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2369/00—Polycarbonates
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2377/00—Polyamides
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2439/00—Containers; Receptacles
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J2429/00—Characterised by the use of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by an alcohol, ether, aldehydo, ketonic, acetal, or ketal radical; Hydrolysed polymers of esters of unsaturated alcohols with saturated carboxylic acids; Derivatives of such polymer
    • C08J2429/02—Homopolymers or copolymers of unsaturated alcohols
    • C08J2429/04—Polyvinyl alcohol; Partially hydrolysed homopolymers or copolymers of esters of unsaturated alcohols with saturated carboxylic acids

Definitions

  • the invention relates to a packaging material with an O 2 barrier, in particular for flexible packagings.
  • packaging materials When packaging certain products such as foodstuffs which are sensitive to oxygen and/or water vapour it is known to use packaging materials in form of plastic laminates having a barrier against ingress of oxygen and/or water vapour. It is also known to use such laminates with barrier properties for packaging foodstuffs in a gas atmosphere in order prevent the gas from leaving the package.
  • Said barrier properties can be obtained by means of a metallisation layer forming part of the plastic laminate. It is further from US-A-4.457.977 and EP-A-2-0 340 910 known that improved barrier properties are obtained by coating a plastic film with an organic coating subsequently being metallised.
  • EP-B-0070 875 and EP-A-0437 946 disclose the combination of metal coating and metal oxide coating to obtain improved barrier properties while maintaining the transparent or translucent character of the packaging material. It further appears from the publications that the plastic film can be primed prior to the metal/metal oxide deposition.
  • the present invention provides a packaging material with an O 2 barrier, in particular for flexible packagings, and which comprises a plastic film coated with an organic coating applied to the plastic film in fluid form, said organic coating overcoated with an inorganic coating comprising a metal oxide or a non-metal oxide and which packag ⁇ ing material is characterised in that the organic coating comprises at least one of the materials ethylene vinyl alcohol (EVOH) and polyvinyl alcohol (PVOH).
  • EVOH ethylene vinyl alcohol
  • PVOH polyvinyl alcohol
  • the good O 2 barrier properties obtained after flexure are believed to be caused by the elasticity of the EVOH or PVOH layer and a surprisingly good adhesion between the EVOH or PVOH coating and the metal oxide or the non-metal oxide coating as well as by the above synergistic effect of the two coatings.
  • a primer layer may be provided between the plastic film and the organic coating (EVOH or PVOH coating) to increase the adhesion of the orgamc coating to the plastic film.
  • the organic coating per se may have an O 2 permeability of less than 10 cm 3 /m 2 /24 hours, preferably of less than 5 cm 3 /m 2 /24 hours.
  • the organic coating may be prepared from a dispersion or a solution comprising at least one of the materials EVOH and PVOH and be of a thickness of preferably 0.5 to 3 ⁇ m, most preferably of between 0.7 to 1.8 ⁇ m. In practice, excellent results have been obtained at a thickness of 1.2 ⁇ m corresponding to an O 2 permeability of about 3 cm 3 /m 2 /24 hours of said coating.
  • the coating may be provided by means of any known coating process such as roll coating, for instance smooth roller coating, gravure roller coating, spray coating and dip coating. In practice excellent results have been obtained by smooth roll coating.
  • the organic coating may comprise EVOH applied by extrusion coating or co-extrusion coating and have a thickness of between 2 to 10 ⁇ m, preferably of between 3 to 5 ⁇ m.
  • the plastic film may be oriented in the machine direction and preferably biaxially oriented.
  • the plastic film preferably being a transparent film may comprise at least one material chosen from among polyolefines, polyamides, polyesters and polycarbonates.
  • the transparent film advantageously may be reverse printed and provided with an intermediary primer layer before being coated with the organic coating and the inorganic coating on the printed side.
  • the organic coating may comprise an oxide chosen from the group comprising aluminium oxides, magnesium oxides and silicon oxides.
  • the inorganic coating may also comprise the corresponding metals or non-metals, preferably the amount of the latter being such that the inorganic coating remains transparent or at least translucent.
  • the inorganic coating may have a thickness of between 50-1000 Angstrom, preferably of between 100-300 Angstrom.
  • the packaging material when seen in the direction from the plastic film towards the coatings the packaging material may comprise an inner sealing medium layer arranged after the coatings and comprising a polyolefme, preferably polyethylene or polypropylene or copolymers thereof.
  • the shown packag ⁇ ing material When seen from the outer face towards the inner face of a package the shown packag ⁇ ing material comprises an outer, substantially transparent film 1 , which may be a single layered film or a laminate formed of several films, and preferably comprises a polyole ⁇ fme, a polyamide or a polyester being biaxially oriented.
  • the outer film 1 is reverse printed on its inwardly facing surface.
  • a primer 3 is coated on the print 2 to provide good adhesion to an organic coating 4 comprising EVOH or PVOH.
  • the organic coating 4 is applied to the primer either by extrusion coating or in form of a solution or dispersion which is dried after application by roller coating.
  • An inorganic coating 5 is vacuum deposited on the PVOH layer 4, said coating 5 comprising metal oxide, preferably in form of an aluminium oxide or magnesium oxide, or a non-metal oxide, preferably in form of a silicon oxide.
  • An inner sealing medium layer 7 is adhered to the inorganic coating 5 by means of an adhesive 6.
  • the inner heat sealing layer 7 is typically a polyolefme, preferably a polyethylene or a copolymer thereof.
  • a biaxially oriented polyester (PETP) film 1 having a thickness of 12 ⁇ m was coated with a polyurethane-based primer 3 on its inwardly facing side.
  • the primer 3 was coated with an EVOH coating in form of an alcohol/water solution of an EVOH granulate.
  • An amount of about 1.2 g/m 2 (dry weight) was deposited corresponding to a thickness of about 1 ⁇ m (dried).
  • the EVOH coating was dried.
  • An Al 2 O 3 coating of a thickness of about 150 Angstrom was vacuum deposited on the EVOH coating.
  • a PE film was laminated to the Al 2 O 3 coating 5 by means of a two-component polyureth ⁇ ane adhesive 6.
  • the prepared laminate was transparent and had an O 2 permeability ⁇ 0.1 cm 3 /m 2 /24 hours.
  • a Gelbo flexure test showed that the O 2 barrier remained unchanged after twenty Gelbo flexures performed according to MIL-V-131G, FED-STD-101, Method No 2017.
  • a laminate was made as described in Example 1, the EVOH coating being omitted.
  • the laminate had an O 2 permeability of about 4 cm 3 /m 2 /24 hours prior to flexure.
  • the laminate had an O 2 permeability of about 25 cm 3 / m 2 /24 hours.
  • the two Examples show that a significantly improved O 2 barrier was obtained by the combined EVOH and Al 2 O 3 coating both before and after flexure compared to an Al 2 O 3 coating without an EVOH coating.
  • the high O 2 barrier both before and after flexure is considered surprising although the used EVOH coating per se has an O 2 permeability of about 3 cm 3 /m 2 /24 hours.

Abstract

A packaging material with an O2 barrier, in particular for flexible packagings, comprises a plastic film (1) coated with an organic coating (4) comprising at least one of the materials ethylene vinyl alcohol (EVOH) and polyvinyl alcohol (PVOH) applied to the plastic film (1) in fluid form. The organic coating (4) is coated with an inorganic coating (5) comprising a metal oxide or a non-metal oxide.

Description

Title: A packaging material with an O2 barrier.
Technical Field
The invention relates to a packaging material with an O2 barrier, in particular for flexible packagings.
Background Art
When packaging certain products such as foodstuffs which are sensitive to oxygen and/or water vapour it is known to use packaging materials in form of plastic laminates having a barrier against ingress of oxygen and/or water vapour. It is also known to use such laminates with barrier properties for packaging foodstuffs in a gas atmosphere in order prevent the gas from leaving the package.
Said barrier properties can be obtained by means of a metallisation layer forming part of the plastic laminate. It is further from US-A-4.457.977 and EP-A-2-0 340 910 known that improved barrier properties are obtained by coating a plastic film with an organic coating subsequently being metallised.
In order to provide transparent or translucent packaging materials with barrier proper¬ ties it has been suggested to coat plastic films with transparent metal oxides or non- metal oxides by vacuum deposition (confer GB-B-22 108 826, GB-B-2 246 794, GB-B- 22 46 795 and EP-B-00 70 875). An O2 barrier greater than 1 cm3/m2/24 hours is obtained thereby.
Finally EP-B-0070 875 and EP-A-0437 946 disclose the combination of metal coating and metal oxide coating to obtain improved barrier properties while maintaining the transparent or translucent character of the packaging material. It further appears from the publications that the plastic film can be primed prior to the metal/metal oxide deposition. Brief Description of the Invention
The present invention provides a packaging material with an O2 barrier, in particular for flexible packagings, and which comprises a plastic film coated with an organic coating applied to the plastic film in fluid form, said organic coating overcoated with an inorganic coating comprising a metal oxide or a non-metal oxide and which packag¬ ing material is characterised in that the organic coating comprises at least one of the materials ethylene vinyl alcohol (EVOH) and polyvinyl alcohol (PVOH). By applying the metal oxide or non-metal oxide coating to an EVOH or PVOH coating, improved barrier properties have surprisingly been obtained compared to a direct application of the metal oxide or non-metal oxide coating to the plastic film or to a primer without barrier properties coated on the plastic film. An O2 permeability of 0.1 cm3/m2/24 hours has thus been obtained. Moreover it has been found that said good O2 barrier properties are maintained after flexure (Gelbo flexures) in spite of the high brittleness of the non-metal oxide coating. The good barrier properties are believed to be caused by a more smooth surface provided by the EVOH or PVOH coating providing a more smooth and uniform metal oxide or non-metal oxide coating and by a synergistic effect between the EVOH or PVOH coating and the metal oxide or non-metal oxide coating. The good O2 barrier properties obtained after flexure are believed to be caused by the elasticity of the EVOH or PVOH layer and a surprisingly good adhesion between the EVOH or PVOH coating and the metal oxide or the non-metal oxide coating as well as by the above synergistic effect of the two coatings.
According to the invention a primer layer may be provided between the plastic film and the organic coating (EVOH or PVOH coating) to increase the adhesion of the orgamc coating to the plastic film.
Furthermore according to the invention the organic coating per se may have an O2 permeability of less than 10 cm3/m2/24 hours, preferably of less than 5 cm3/m2/24 hours.
Moreover according to the invention the organic coating may be prepared from a dispersion or a solution comprising at least one of the materials EVOH and PVOH and be of a thickness of preferably 0.5 to 3 μm, most preferably of between 0.7 to 1.8 μm. In practice, excellent results have been obtained at a thickness of 1.2 μm corresponding to an O2 permeability of about 3 cm3/m2/24 hours of said coating. The coating may be provided by means of any known coating process such as roll coating, for instance smooth roller coating, gravure roller coating, spray coating and dip coating. In practice excellent results have been obtained by smooth roll coating.
Furthermore according to the invention the organic coating may comprise EVOH applied by extrusion coating or co-extrusion coating and have a thickness of between 2 to 10 μm, preferably of between 3 to 5 μm.
Moreover according to the invention the plastic film may be oriented in the machine direction and preferably biaxially oriented.
Furthermore according to the invention the plastic film preferably being a transparent film may comprise at least one material chosen from among polyolefines, polyamides, polyesters and polycarbonates. In mis connection it should be noted that the transparent film advantageously may be reverse printed and provided with an intermediary primer layer before being coated with the organic coating and the inorganic coating on the printed side.
Moreover according to the invention the organic coating may comprise an oxide chosen from the group comprising aluminium oxides, magnesium oxides and silicon oxides. In this connection it should be noted that in addition to the said oxides the inorganic coating may also comprise the corresponding metals or non-metals, preferably the amount of the latter being such that the inorganic coating remains transparent or at least translucent.
Furthermore according to the invention the inorganic coating may have a thickness of between 50-1000 Angstrom, preferably of between 100-300 Angstrom. Finally according to the invention when seen in the direction from the plastic film towards the coatings the packaging material may comprise an inner sealing medium layer arranged after the coatings and comprising a polyolefme, preferably polyethylene or polypropylene or copolymers thereof.
Brief Description of the Drawing
The invention is explained in detail below with reference to the drawing whose only illustration is a sectional view through an embodiment of the packagaging material according to the invention.
Best Mode for Carrying Out the Invention
When seen from the outer face towards the inner face of a package the shown packag¬ ing material comprises an outer, substantially transparent film 1 , which may be a single layered film or a laminate formed of several films, and preferably comprises a polyole¬ fme, a polyamide or a polyester being biaxially oriented. The outer film 1 is reverse printed on its inwardly facing surface. A primer 3 is coated on the print 2 to provide good adhesion to an organic coating 4 comprising EVOH or PVOH. The organic coating 4 is applied to the primer either by extrusion coating or in form of a solution or dispersion which is dried after application by roller coating. An inorganic coating 5 is vacuum deposited on the PVOH layer 4, said coating 5 comprising metal oxide, preferably in form of an aluminium oxide or magnesium oxide, or a non-metal oxide, preferably in form of a silicon oxide. An inner sealing medium layer 7 is adhered to the inorganic coating 5 by means of an adhesive 6. The inner heat sealing layer 7 is typically a polyolefme, preferably a polyethylene or a copolymer thereof.
The invention is further illustrated by means of the following examples:
Example 1
A biaxially oriented polyester (PETP) film 1 having a thickness of 12 μm was coated with a polyurethane-based primer 3 on its inwardly facing side. The primer 3 was coated with an EVOH coating in form of an alcohol/water solution of an EVOH granulate. An amount of about 1.2 g/m2 (dry weight) was deposited corresponding to a thickness of about 1 μm (dried). The EVOH coating was dried. An Al2O3 coating of a thickness of about 150 Angstrom was vacuum deposited on the EVOH coating. A PE film was laminated to the Al2O3 coating 5 by means of a two-component polyureth¬ ane adhesive 6.
The prepared laminate was transparent and had an O2 permeability < 0.1 cm3/m2/24 hours.
A Gelbo flexure test showed that the O2 barrier remained unchanged after twenty Gelbo flexures performed according to MIL-V-131G, FED-STD-101, Method No 2017.
Example 2
A laminate was made as described in Example 1, the EVOH coating being omitted.
The laminate had an O2 permeability of about 4 cm3/m2/24 hours prior to flexure.
After twenty Gelbo flexures the laminate had an O2 permeability of about 25 cm3/ m2/24 hours.
The two Examples show that a significantly improved O2 barrier was obtained by the combined EVOH and Al2O3 coating both before and after flexure compared to an Al2O3 coating without an EVOH coating. The high O2 barrier both before and after flexure is considered surprising although the used EVOH coating per se has an O2 permeability of about 3 cm3/m2/24 hours.

Claims

Claims.
1. A packaging material with an O2 barrier, in particular for flexible packagings, and which comprises a plastic film (1) coated with an organic coating (4) applied to the plastic film in fluid form, said organic coating (4) overcoated with an inorganic coating (5) comprising a metal oxide or a non-metal oxide, characterised in that the organic coating (4) comprises at least one of the materials ethylene vinyl alcohol (EVOH) and polyvinyl alcohol (PVOH).
2. A packaging material according to claim ^characterised by a primer layer (3) provided between the plastic film (1) and the organic coating (4) (the EVOH or PVOH coating).
3. A packaging material according to claims 1 or 2, characterised in that the organic coating per se has an O2 permeability of less than 10 cm3/m2/24 hours, preferably of less than 5 cm3/m2/24 hours.
4. A packaging material according to one or more of the preceding claims, characterised in that the organic coating (4) is prepared from a dispersion or a solution comprising at least one of the materials EVOH and PVOH and of a thickness of preferably 0.5 to 3 μm, most preferably of between 0.7 to 1.8 μm.
5. A packaging material according to one or more of the claims 1-3, characterised in that the organic coating (4) comprises EVOH applied by extrusion coating or co-extrusion coating and of a thickness of between 2 to 10 μm, preferably of between 3 to 5 μm.
6. A packaging material according to one or more of the preceding claims, characterised in that the plastic film (1) at least is oriented in the machine direction and preferably biaxially oriented.
7. A packaging material according to claim 6, characterised in that the plastic film (1) comprises at least one material chosen from among polyolefines, polyamides, polyesters and polycarbonates.
8. A packaging material according to one or more of the preceding claims, characterised in that the inorganic coating (5) comprises an oxide selected from the group comprising aluminium oxides, magnesium oxides and silicon oxides.
9. A packaging material according to claim 8, characterised in that the inorganic coating has a thickness of between 50-1000 Angstrom, preferably of between 100-300 Angstrom.
10. A packaging material according one or more of the preceding claims, characterised in that when seen in direction from the plastic film (1) towards the coatings it comprises an inner sealing medium layer (7) arranged after the coatings and comprising a polyolefme, preferably polyethylene or polypropylene or copolymers thereof.
PCT/DK1997/000148 1996-04-12 1997-04-08 A packaging material with an o2 barrier WO1997038852A1 (en)

Priority Applications (7)

Application Number Priority Date Filing Date Title
JP9536653A JP2000508260A (en) 1996-04-12 1997-04-08 O Bottom 2 Packaging material with barrier
PL97329282A PL329282A1 (en) 1996-04-12 1997-04-08 Oxygen barrier containing packaging material
BR9708623A BR9708623A (en) 1996-04-12 1997-04-08 Packing material with barrier for 02
AU23803/97A AU711542B2 (en) 1996-04-12 1997-04-08 A packaging material with an O2 barrier
EP97919279A EP0892718A1 (en) 1996-04-12 1997-04-08 A packaging material with an o 2 barrier
NZ332016A NZ332016A (en) 1996-04-12 1997-04-08 A packaging material with an oxygen barrier, based on organic polymers
NO19984716A NO313955B1 (en) 1996-04-12 1998-10-09 Packaging material with an O2 barrier

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
DK41996 1996-04-12
DK0947/96 1996-09-04
DK0419/96 1996-09-04
DK94796 1996-09-04

Publications (1)

Publication Number Publication Date
WO1997038852A1 true WO1997038852A1 (en) 1997-10-23

Family

ID=26063965

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/DK1997/000148 WO1997038852A1 (en) 1996-04-12 1997-04-08 A packaging material with an o2 barrier

Country Status (11)

Country Link
EP (1) EP0892718A1 (en)
JP (1) JP2000508260A (en)
AU (1) AU711542B2 (en)
BR (1) BR9708623A (en)
CA (1) CA2249457A1 (en)
CZ (1) CZ314198A3 (en)
HU (1) HUP9901593A3 (en)
NO (1) NO313955B1 (en)
NZ (1) NZ332016A (en)
PL (1) PL329282A1 (en)
WO (1) WO1997038852A1 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2002034820A1 (en) * 2000-10-26 2002-05-02 Abdul Aziz Okhai Packaging material and method for manufacturing the same
EP1479735A1 (en) * 2003-05-19 2004-11-24 Cofresco Frischhalteprodukte GmbH & Co. KG Coating and bag

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0372489A2 (en) * 1988-12-05 1990-06-13 Mitsubishi Chemical Corporation Moistureproof film
EP0619178A1 (en) * 1992-10-20 1994-10-12 Toppan Printing Co., Ltd. Multi-layered film material
WO1995034396A1 (en) * 1994-06-10 1995-12-21 Mobil Oil Corporation Film composition
EP0723860A1 (en) * 1995-01-26 1996-07-31 Elf Atochem S.A. Packaging material comprising a layer of silicone oxide and a layer of polyolefin

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0372489A2 (en) * 1988-12-05 1990-06-13 Mitsubishi Chemical Corporation Moistureproof film
EP0619178A1 (en) * 1992-10-20 1994-10-12 Toppan Printing Co., Ltd. Multi-layered film material
WO1995034396A1 (en) * 1994-06-10 1995-12-21 Mobil Oil Corporation Film composition
EP0723860A1 (en) * 1995-01-26 1996-07-31 Elf Atochem S.A. Packaging material comprising a layer of silicone oxide and a layer of polyolefin

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2002034820A1 (en) * 2000-10-26 2002-05-02 Abdul Aziz Okhai Packaging material and method for manufacturing the same
EP1479735A1 (en) * 2003-05-19 2004-11-24 Cofresco Frischhalteprodukte GmbH & Co. KG Coating and bag

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NO984716D0 (en) 1998-10-09
PL329282A1 (en) 1999-03-15
NO313955B1 (en) 2003-01-06
EP0892718A1 (en) 1999-01-27
HUP9901593A3 (en) 2001-01-29
HUP9901593A2 (en) 1999-08-30
AU711542B2 (en) 1999-10-14
NO984716L (en) 1998-10-09
BR9708623A (en) 1999-08-03
CZ314198A3 (en) 1999-01-13
JP2000508260A (en) 2000-07-04
AU2380397A (en) 1997-11-07
CA2249457A1 (en) 1997-10-23
NZ332016A (en) 1999-07-29

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