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.

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• Chemical & Material Sciences (AREA)
• Health & Medical Sciences (AREA)
• Chemical Kinetics & Catalysis (AREA)
• Medicinal Chemistry (AREA)
• Polymers & Plastics (AREA)
• Organic Chemistry (AREA)
• Inorganic Chemistry (AREA)
• Laminated Bodies (AREA)
• Wrappers (AREA)
• Packages (AREA)

Applications Claiming Priority (5)

Publications (1)

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Family Applications (1)

Country Status (11)

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Family Cites Families (4)

• 1997
  • 1997-04-08 CA CA002249457A patent/CA2249457A1/en not_active Abandoned
  • 1997-04-08 WO PCT/DK1997/000148 patent/WO1997038852A1/en not_active Application Discontinuation
  • 1997-04-08 HU HU9901593A patent/HUP9901593A3/hu unknown
  • 1997-04-08 CZ CZ983141A patent/CZ314198A3/cs unknown
  • 1997-04-08 EP EP97919279A patent/EP0892718A1/de not_active Ceased
  • 1997-04-08 PL PL97329282A patent/PL329282A1/xx unknown
  • 1997-04-08 BR BR9708623A patent/BR9708623A/pt not_active Application Discontinuation
  • 1997-04-08 NZ NZ332016A patent/NZ332016A/xx unknown
  • 1997-04-08 JP JP9536653A patent/JP2000508260A/ja active Pending
  • 1997-04-08 AU AU23803/97A patent/AU711542B2/en not_active Ceased
• 1998
  • 1998-10-09 NO NO19984716A patent/NO313955B1/no not_active IP Right Cessation

Non-Patent Citations (1)

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