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WO2006029842A1 - Emballage pour produits alimentaires, substrat revetu, systeme de revetement permettant de produire ledit emballage et utilisation associee - Google Patents

Emballage pour produits alimentaires, substrat revetu, systeme de revetement permettant de produire ledit emballage et utilisation associee Download PDF

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Publication number
WO2006029842A1
WO2006029842A1 PCT/EP2005/009885 EP2005009885W WO2006029842A1 WO 2006029842 A1 WO2006029842 A1 WO 2006029842A1 EP 2005009885 W EP2005009885 W EP 2005009885W WO 2006029842 A1 WO2006029842 A1 WO 2006029842A1
Authority
WO
WIPO (PCT)
Prior art keywords
packaging
anions
type
coating system
substrate
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/EP2005/009885
Other languages
English (en)
Inventor
Dammes Hans Van Der Weijde
H. Neil Mcmurray
Trystan Watson
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.)
Tata Steel Ijmuiden BV
Original Assignee
Corus Staal BV
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 Corus Staal BV filed Critical Corus Staal BV
Publication of WO2006029842A1 publication Critical patent/WO2006029842A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D167/00—Coating compositions based on polyesters obtained by reactions forming a carboxylic ester link in the main chain; Coating compositions based on derivatives of such polymers
    • C09D167/02—Polyesters derived from dicarboxylic acids and dihydroxy compounds
    • 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
    • B32B15/00—Layered products comprising a layer of metal
    • B32B15/04—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B32B15/08—Layered products comprising a layer of metal comprising metal 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
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
    • C09D5/08—Anti-corrosive paints
    • C09D5/082—Anti-corrosive paints characterised by the anti-corrosive pigment
    • C09D5/084—Inorganic compounds
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
    • C09D7/40—Additives
    • C09D7/60—Additives non-macromolecular
    • C09D7/61—Additives non-macromolecular inorganic
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K3/00—Use of inorganic substances as compounding ingredients
    • C08K3/10—Metal compounds
    • C08K3/105—Compounds containing metals of Groups 1 to 3 or of Groups 11 to 13 of the Periodic Table
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K3/00—Use of inorganic substances as compounding ingredients
    • C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
    • C08K3/24—Acids; Salts thereof
    • C08K3/26—Carbonates; Bicarbonates

Definitions

  • the invention relates to a packaging for packaging food products comprising a metal substrate coated with an organic coating system.
  • the invention further relates to a metal substrate coated with an organic coating for producing said packaging, to an organic coating system for application onto a metal substrate for use in the manufacture of said packaging and to the use of said packaging.
  • Substrates with an organic coating for use in packaging for packaging food products are known. It should be noted that food products in the context of the invention are to be understood as products which are edible or drinkable for human beings or animals. Examples of food products in the context of the invention are fish or meat preserves, fruit or vegetable preserves, drinks etc.
  • the organic coating system may consist of a single coating layer on a substrate, but it may also comprise more than one layer. These single-layered or multi-layered organic coating systems act as a barrier to prevent the contents of the packaging to interact with the substrate at the interface between the substrate and the organic coating system.
  • the problem with these known single-layered or multi-layered organic coating systems is that if the coating system is locally damaged, or if the diffusion through the single-layered or multi-layered organic coating system is increased, for instance as a result of an increased temperature during the heat treatment of the system, or during extended periods of storage, that certain components of the contents of the packaging migrate through the single- layered or multi-layered organic coating systems to the interface between the substrate and the coating system. These components may locally damage the substrate, which is generally undesirable. It is an object of this invention to prevent, or at least delay, the penetration of certain components of the contents of the packaging, the contents of the packaging comprising food products, through the organic coating system to the interface between the substrate and the coating system.
  • this object is achieved by providing a packaging for packaging food products comprising a metal substrate coated with an organic coating system, wherein the organic coating system comprises an anion exchanging compound comprising anions of a first type, for protecting the substrate from interacting with anions of a second type, the anions of the second type originating from the food products, by exchanging the anions of the first type by the anions of the second type.
  • the organic coating system comprises an anion exchanging compound comprising anions of a first type, for protecting the substrate from interacting with anions of a second type, the anions of the second type originating from the food products, by exchanging the anions of the first type by the anions of the second type.
  • the object of the invention is achieved because the components of the contents of the packaging, the contents of the packaging comprising food products, i.e. the anions of the second type, are prevented from penetrating the organic coating system to the interface between the metal substrate and the coating system because the penetrating anions of the second type are exchanged by anions of the first type by the anion exchanging compound.
  • the anions of the first type are selected to be not harmful to the substrate, or at least less harmful to the substrate, than the anions of the second type which are present in the food products.
  • the substrate is protected against interacting with the harmful anions of the second type.
  • Protecting the substrate from interacting with anions in the context of the invention is to be understood as protecting the substrate against harmful anions which may cause corrosion of the substrate.
  • Corrosion may be the direct result of the harmful anions, but it may also be the result of the harmful anions making the environment at the interface of the substrate and the coating system more corrosive. For instance, the pH is also likely to be lowered leading to an increase in conductivity and cathodic reactions.
  • the exchange of anions of a second type by the anions of the first type is sustained until the anion exchanging compound is exhausted.
  • the amount of anion exchanging compound in the anion exchanging layer should be chosen such that the substrate is protected at least for the duration of the use of the packaging, i.e. the filling process and any subsequent process steps and the shelf life thereafter.
  • the organic coating system is also provided with barrier properties for impeding the anions of the second type from migrating through the coating system.
  • the anions of the second type i.e. the harmful anions
  • the anions of the second type are prevented from penetrating the organic coating system and hence the penetration of the organic coating system by the anions of the second type is delayed.
  • This can be achieved by selecting a polymer coating which has a lower diffusion rate for anions of the second type.
  • An example of such a coating with a low diffusion rate for anions of the second type, such as acetate anions, is semi-crystalline PET.
  • the organic coating system comprises an anion exchanging layer provided with the anion exchanging compound and a barrier layer, the barrier layer being provided to impede the anions of the second type from migrating through the coating system, the anion exchanging layer being positioned between the barrier layer and the substrate.
  • penetration of the coating system by the anions of the second type i.e. the harmful anions
  • penetration of the coating system by the anions of the second type is delayed by providing a barrier layer which has a lower diffusion rate for anions of the second type.
  • the barrier layer is provided such that the anion exchanging layer is positioned between the barrier layer and the substrate. This way the amount of harmful anions reaching the anion exchanging layer is reduced, and hence the rate of exhaustion of the anion exchanging compound is reduced.
  • the duration during which the substrate is protected against the anions of the second type is prolonged.
  • the anion of the first type is a carbonate and/or a nitrate anion.
  • the substrate is effectively protected against the harmful effect of the anions of the second type.
  • the carbonate and nitrate anions are at least less harmful or even not harmful to the substrate.
  • Other anions which may have a similar effect are chromate, vanadate, tungstate, molybdate, phosphate.
  • the anions of the first type should preferably not have an adverse effect on the contents of the packaging. They must not affect taste or be unhealthy to the consumer of the contents of the packaging.
  • the anion exchanging compound substantially comprises an anionic clay, preferably hydrotalcite.
  • This type of compound exhibits a layer structure similar to brucite (Mg(OH) 2 ), but random substitution of trivalent for bivalent metal ions in octahedral positions results in a positive layer charge. Electroneutrality is preserved by unbound, substantially exchangeable, bivalent anions located within the disordered and hydrated interlayer space.
  • anionic clays may be represented with the following general formula:
  • Hydrotalcite has been found to be easily incorporable into an organic coating system and the anions of the first type (CO 3 2" ) are exchangeable with anions of the second type, such as an acetate anion.
  • the carbonate anion is harmless to the substrate of the packaging, to the contents of the packaging and to the consumer of the contents.
  • the anion exchanging layer comprises at least at least 0.1 vol.% of hydrotalcite, preferably at least 1 vol.%, more preferably at least 2.5 vol.%, even more preferably at least 5 vol.%.
  • hydrotalcite preferably at least 1 vol.%, more preferably at least 2.5 vol.%, even more preferably at least 5 vol.%.
  • the anion exchanging compound is provided in the anion exchanging layer in the form of particles. It was found that the effectivity of the anion exchanging compound, such as the hydrotalcite, is increased when it is present in the anion exchanging layer in the form of a finely distributed powder.
  • the barrier layer substantially comprises PET and wherein the anion exchanging layer substantially comprises PET.
  • This type of layer provided a good combination of the barrier properties of the barrier layer and the ability to accommodate the anion exchanging compound in the anion exchanging layer.
  • Anionic exchange clays such as hydrotalcite were found to be easily incorporable in the PET layer and such an organic coating system provided effective protection of a substrate against the effect of the anions of the second type.
  • the coating system also comprises a contact layer contacting the substrate.
  • a contact layer between the substrate and the anion exchanging layer may be desirable or even required for instance to increase the adhesiveness of the organic coating system to the substrate.
  • the quality of the adhesion depends on the nature of the substrate and that of the coating system.
  • the coating system may also comprise one or more additional layers having a different function from the function of the layers indicated hereinabove. The additional layer may for instance have a decorative function.
  • the metal substrate is a steel or an aluminium or an aluminium alloy substrate.
  • the steel is a steel of the ECCS type (Electrolytic Chromium Coated Steel) or tinplate. It has been found that the combination of the coating system as described hereinabove with a metal substrate, preferably a steel or an aluminium or an aluminium alloy substrate, provides a very effective combination of formability of the substrate and protection against deterioration of the contents of the packaging to be produced from the coated substrate as well as against deterioration of the substrate itself.
  • Low-carbon steels C ⁇ 0.1% in weight
  • extra-low carbon steels C ⁇ 0.03%
  • ultra-low carbon steels C ⁇ 0.005%, stabilised or unstabilised
  • aluminium alloys of the AA3000-series are suitable substrates for producing a packaging according to the invention.
  • the invention is also embodied in a metal substrate comprising an organic coating system for use in the manufacture of a packaging for food products as described hereinabove. This substrate can be used for instance to produce blanks for the manufacture of a packaging.
  • the metal substrate is provided in the form of a strip, optionally in the form of a coiled strip.
  • the organic coating system is preferably applied to the substrate by a co- extrusion process, by direct application or by film lamination.
  • the organic coating system may also, at least partly, be applied in the form of a lacquer, in which case the anion exchanging compound comprising anions of a first type may be dispersed in the lacquer.
  • the invention is also embodied in an organic coating system for application onto a metal substrate for use in the manufacture of a packaging as described hereinabove.
  • This embodiment allows the production of an organic coating system in the form of a film which can be applied to a metal substrate for instance in a film lamination process.
  • one or more additional layers may be present, this additional layer or these additional layers having one or more different function(s) from the adhesion-improving function of the adhesion layer, the barrier function of the barrier layer or the contact function of the contact layer.
  • the additional layer may for instance have a decorative function, or a filler function.
  • the organic coating system may also be present between the metal substrate and the additional layer or even be a part of the organic coating system, as long as its presence or their presence does not affect the anion exchanging function of the organic coating system.
  • the invention is also embodied in the use of packaging as described hereinabove in a process comprising the steps of: filling or hot-filling the packaging with a food product; closing the packaging, preferably with a lid.
  • the anions of the second type originating from the food products are prevented from attacking the metal substrate because they are exchanged for the anions of the first type which are harmless to the substrate, the food products and the consumer thereof.
  • the amount of anion exchanging compound should be chosen such as to produce effective protection of the substrate at least for the duration the filling and closing process and the shelf life of the packaging thereafter.
  • the invention is also embodied in the use of packaging as described hereinabove in a process as described hereinabove comprising the additional step of heat treating the closed packaging.
  • Heat treating of the closed packaging is generally performed with the aim to cook and/or sterilise or pasteurise the contents of the packaging.
  • the diffusivity of the organic coating system for anions of the second type increases.
  • the anions of the second type originating from the food products are prevented from attacking the metal substrate because they are exchanged for the anions of the first type which are harmless to the substrate, the food products and the consumer thereof.
  • the amount of anion exchanging compound should be chosen such as to produce effective protection of the substrate at least for the duration of the filling and closing process, the subsequent heat treatment such as cooking and/or pasteurisation or sterilisation and the shelf life of the packaging thereafter.
  • Figure 1 shows a metal substrate 1 provided with a coating system 2 comprising particles of an anionic exchange compound 3.
  • Figure 2 shows a metal substrate 1 provided with a coating system 2 comprising a barrier layer 4 and an anionic exchange layer 5 provided with particles of an anionic exchange compound 3.
  • Figure 3 shows a metal substrate 1 provided with a coating system 2 comprising a barrier layer 4, an anionic exchange layer 5 provided with particles of an anionic exchange compound 3, and a contact layer 6 contacting the substrate 1.
  • PET solutions were prepared with different amounts of hydrotalcite powder, which was obtained directly from a supplier and substrates of ECCS were coated therewith. A barrier layer of PET was applied upon the layer comprising the hydrotalcite powder. From these substrates samples were cut for testing. These samples were submerged in the acetic acid (3% and 5% solutions) at 120 C C for 1 hour during which only the coated area was exposed to the acid (i.e. no cut edges were exposed). These temperature and acidity conditions are representative for the sterilisation of food products, although in actual practice the acid concentration will generally be lower. Hence this test is an accelerated test, only accelerating the processes. Experience has shown that the qualitative conclusions from this test are accurate.
  • Table 1 shows the results of a range of hydrotalcite dispersed coatings when subjected to 3% and 5% acetic acid at 12O 0 C for 1 hour.
  • PET coatings containing no hydrotalcite are given as well.
  • the images show a marked difference in visible corrosion between coatings without and with hydrotalcite.
  • the PET coatings without any hydrotalcite showed virtually complete corrosion at both 3% and 5% acetic acid.
  • the PET coatings with hydrotalcite appear to significantly inhibit corrosion already at the very low levels of 0.1% of hydrotalcite. At higher levels of hydrotalcite, the coating system proves to be increasingly effective in inhibiting corrosion of the substrate.

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  • Chemical & Material Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Wood Science & Technology (AREA)
  • Organic Chemistry (AREA)
  • Inorganic Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Laminated Bodies (AREA)
  • Paints Or Removers (AREA)
  • Wrappers (AREA)

Abstract

L'invention concerne un emballage pour produits alimentaires comprenant un substrat métallique revêtu au moyen d'un système de revêtement organique. L'invention concerne également un substrat métallique revêtu au moyen d'un revêtement organique, permettant de produire ledit emballage, ainsi qu'un système de revêtement organique permettant l'application sur un substrat métallique, utilisé dans la fabrication dudit emballage. L'invention concerne encore l'utilisation de cet emballage. L'emballage selon l'invention se caractérise en ce que le système de revêtement organique comprend un composé échangeur d'anions comprenant des anions d'un premier type, destiné à protéger le substrat métallique d'une interaction avec des anions d'un deuxième type, les anions du deuxième type provenant des produits alimentaires, par l'échange des anions du premier type par les anions du deuxième type.
PCT/EP2005/009885 2004-09-13 2005-09-13 Emballage pour produits alimentaires, substrat revetu, systeme de revetement permettant de produire ledit emballage et utilisation associee Ceased WO2006029842A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
EP04255515 2004-09-13
EP04255515.1 2004-09-13

Publications (1)

Publication Number Publication Date
WO2006029842A1 true WO2006029842A1 (fr) 2006-03-23

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ID=34930643

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2005/009885 Ceased WO2006029842A1 (fr) 2004-09-13 2005-09-13 Emballage pour produits alimentaires, substrat revetu, systeme de revetement permettant de produire ledit emballage et utilisation associee

Country Status (1)

Country Link
WO (1) WO2006029842A1 (fr)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0282619A1 (fr) * 1985-09-24 1988-09-21 Kyowa Chemical Industry Co., Ltd. Composition de couche de fond résistant à la corrosion filiforme et méthode de prévention de la corrosion filiforme
EP0464782A2 (fr) * 1990-07-03 1992-01-08 Viskase Corporation Film multicouche désodorisé avec couche barrière en copolymère de chlorure de vinylidène
US6458439B1 (en) * 1996-05-17 2002-10-01 The Valspar Corporation Extrusion coating compositions and method
WO2003102085A2 (fr) * 2002-05-31 2003-12-11 Uws Ventures Limited Pigments anticorrosion

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0282619A1 (fr) * 1985-09-24 1988-09-21 Kyowa Chemical Industry Co., Ltd. Composition de couche de fond résistant à la corrosion filiforme et méthode de prévention de la corrosion filiforme
EP0464782A2 (fr) * 1990-07-03 1992-01-08 Viskase Corporation Film multicouche désodorisé avec couche barrière en copolymère de chlorure de vinylidène
US6458439B1 (en) * 1996-05-17 2002-10-01 The Valspar Corporation Extrusion coating compositions and method
WO2003102085A2 (fr) * 2002-05-31 2003-12-11 Uws Ventures Limited Pigments anticorrosion

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