EP2403715A1 - Chemically resistant laminate film - Google Patents

Chemically resistant laminate film

Info

Publication number
EP2403715A1
EP2403715A1 EP10707952A EP10707952A EP2403715A1 EP 2403715 A1 EP2403715 A1 EP 2403715A1 EP 10707952 A EP10707952 A EP 10707952A EP 10707952 A EP10707952 A EP 10707952A EP 2403715 A1 EP2403715 A1 EP 2403715A1
Authority
EP
European Patent Office
Prior art keywords
chemically resistant
film
layer
laminate film
microns
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.)
Withdrawn
Application number
EP10707952A
Other languages
German (de)
French (fr)
Inventor
John Finlay Forsyth
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.)
Amcor Flexibles Transpac BVBA
Original Assignee
Amcor Flexibles Transpac BVBA
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 Amcor Flexibles Transpac BVBA filed Critical Amcor Flexibles Transpac BVBA
Publication of EP2403715A1 publication Critical patent/EP2403715A1/en
Withdrawn legal-status Critical Current

Links

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
    • 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
    • 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
    • B32B15/20—Layered products comprising a layer of metal comprising aluminium or copper
    • 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
    • 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
    • B32B27/28—Layered products comprising a layer of synthetic resin comprising synthetic resins not wholly covered by any one of the sub-groups B32B27/30 - B32B27/42
    • 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
    • B32B27/308—Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers comprising acrylic (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
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/30—Properties of the layers or laminate having particular thermal properties
    • B32B2307/31—Heat sealable
    • 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
    • B32B2311/00—Metals, their alloys or their compounds
    • B32B2311/24—Aluminium
    • 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
    • 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
    • B32B2323/046—LDPE, i.e. low density 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
    • B32B2333/00—Polymers of unsaturated acids or derivatives thereof
    • 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
    • B32B2439/00—Containers; Receptacles
    • B32B2439/02—Open containers
    • B32B2439/06—Bags, sacks, sachets

Definitions

  • a typical example of such packaging is for those personal care products that need to be dispensed in known quantities, for example, hair dyes where a single sachet is sized to contain a predetermined quantity of hair dye required to achieve the desired colouration.
  • a further example of the use of such flexible films is in the formation of sample sachets used to contain a small sample of a particular cosmetic or personal care product and intended to be distributed freely as promotional samples, often being fixed to the cover of relevant magazines.
  • the sachets are typically formed by bonding together two sheets of laminated flexible film in discrete regions, such as around their edges, to form one or more internal pockets in which the cosmetic or personal care product is retained.
  • the laminated flexible films used to produce these known packaging sachets are typically formed from multiple films layered together during manufacture. More typically the composite laminated films include an inner film having a polyethylene content, the polyethylene providing strength and flexibility but also allowing adjacent composite films to be bonded to one another by heat sealing the inner films together. A middle film, typically aluminium foil, is included, the aluminium foil being provided as a non porous layer to prevent the escape of the contents from within the filled final packaging. Finally, an outer film is provided, which may include a polyester, nylon or polyolefms, onto which any desired branding or colouring may be printed. Such composite flexible films allow a wide range of packaging solutions to be adopted and the outer layers can be easily printed upon.
  • Such composite laminated flexible films are not particularly suitable for packaging products that include aggressive, or corrosive, chemical components.
  • Examples of such products that contain aggressive chemical components include certain hair dyes and skin treatments.
  • the inner polyethylene film of the conventional laminated flexible film sachets tends to be either porous to such aggressive chemicals or is directly corroded by the chemicals such that the further layers of the composite film become subject to a further attack by the aggressive chemical, leading to either complete failure of the composite film, and therefore the packaging, or partial failure of the film due to de lamination of the individual films making up the composite flexible film, when the packaging is attempted to be opened.
  • the total or partial failure of the composite laminate films occurs within a time frame that is significantly less than the desired shelf life for the product.
  • a chemically resistant laminated film comprising an outer film including a layer of aluminium foil bonded to a heat sealable film by a chemically resistant layer, wherein the chemically resistant comprises an ethylene acrylic acid polymer.
  • the heat sealable film may further include a second chemically resistant layer comprising a polymer of either ethylene acrylic acid or ethylene methacrylic acid.
  • the copolymer content of the second chemically resistant layer is in the range of 6 to 20% by weight.
  • the second chemically resistant layer may have a thickness in the range of 5 - 20 microns, with a preferred thickness of 8 microns.
  • the first chemically resistant layer has a thickness in the range of 5 - 30 microns, with a preferred thickness of 22 microns.
  • the heat sealable film may further include a heat sealing layer comprising one or more polyethylene polyolefms.
  • the heat sealing layer may comprise a mixture of linear low density polyethylene and low density polyethylene.
  • the heat sealable layer may additionally be peelable.
  • the heat sealable film of the chemically resistant laminate preferably has a thickness in the range of 60 to 140 microns.
  • a chemically resistant sachet comprising two sheets of chemically resistant laminate film according to the first aspect of the invention having the respective heat sealable films bonded together about the periphery of the sachet.
  • Figure 1 schematically illustrates the composition of a laminate film according to an embodiment of the present invention
  • Figure 2 schematically illustrates in greater detail the composition of one of the layers of the film illustrated in Figure 1;
  • Figure 3 schematically illustrates a sachet using composite films according to embodiments of the present invention.
  • FIG. 1 schematically illustrates in cross section a portion of a composite laminate film according to an embodiment of the present invention.
  • the laminate film 2 comprises an outer film 4 made up from an outer layer 6 that is extrusion laminated by means of an adjacent layer 8 to a further layer of aluminium foil 10.
  • the first layer 6 of the outer film 4 may be a polyester, such as biaxially orientated polyester (PET), or alternatively a biaxially orientated nylon.
  • PET biaxially orientated polyester
  • the second layer 8 of the outer film which serves the purpose of bonding the outer layer 6 to the aluminium foil 10, is preferably a polyethylene, such as low density polyethylene (LDPE).
  • LDPE low density polyethylene
  • the bonding layer 8 may also be an ethylene vinyl acetate (EVA) copolymer (having a vinyl acetate content in the range of 4 to 20% and more preferably 4%) or be an ethylene methacrylic acid (EMA) copolymer (preferably having a methacrylic acid content in the range of 6 to 20%, with a preferred methacrylic acid content of 6%).
  • EVA ethylene vinyl acetate
  • EMA ethylene methacrylic acid
  • the film 2 has an inner layer 12 comprising a cast or blown film co-extruded heat sealable film.
  • the inner, heat sealable, layer 12 is extrusion laminated to the foil side of the outer film 4 using a chemically resistant layer 14.
  • the chemically resistant layer 14 preferably comprises ethylene acrylic acid (EAA), but may in alternative embodiments comprise other materials having analogous chemical resistant properties to EAA.
  • the inner, heat sealable, layer 12 is schematically illustrated in further detail in cross section in Figure 2 and preferably comprises a heat sealing layer 120 comprising a mixture of low density poly ethylenes, such as linear low density polyethylene and low density polyethylene.
  • An adjacent core layer 122 which provides the mechanical bulk strength and flexibility of the heat sealable film 12, preferably comprises a further mixture of medium and low density poly ethylenes.
  • a further chemically resistant layer 124 preferably comprises ethylene acrylic acid (EAA).
  • the outer polyester or nylon layer has a preferred layer thickness of 12 microns, whilst the aluminium foil layer 10 has a thickness within the range of 9 microns to 25 microns, with a preferred thickness of 12 microns.
  • the thickness for the chemically resistant EAA layer 14 is preferably in the range of 5 - 30 microns, with a more preferred thickness of 22 microns.
  • the chemically resistant layer 124 of the heat sealable film 12 preferably comprising ethylene acrylic acid EAA may alternatively comprise copolymers of ethylene acrylic acid or ethylene methacrylic acid having a respective acid contents in the range of 6 to 20%, with a preferred content of 9%.
  • the chemically resistant layer 124 thickness is preferably in the range of 5 to 20 microns, with 8 microns being a preferred thickness.
  • the core layer 122 may alternatively comprise low density polyethylenes, linear low density polyethylene, medium density polyethylene, linear medium density polyethylene and high density polyethylenes and mixtures thereof.
  • a preferred embodiment is a mixture of linear medium density polyethylenes and linear density polyethylene with a respective mixture by weight of 70/30% with a layer thickness preferably in the range 30 to 90 microns, and more preferably a thickness of 36 microns.
  • the heat sealing surface 120 preferably comprises linear low density polyethylene and a low density polyethylene being a 70/30% mix by weight, but may alternatively comprise mixtures of low density polyethylene, linear low density polyethylene, medium density polyethylene, linear medium density polyethylene and high density polyethylene.
  • the layer thickness is preferably in the range of 5 to 40 microns, with a preferred thickness of 16 microns.
  • the heat sealing surface 120 of the inner film 12 may alternatively comprise a peelable film. Peelability is conferred on the film by using mixtures of the following polymers: LDPE plus polystyrene, LDPE plus polybutylene, LDPE plus polypropylene or LDPE plus inorganic additives such as calcium carbonate or talcs such as calcium, aluminium or magnesium silicates.
  • the presence of the second component in the LDPE serves to mechanically weaken the surface layer of the film such that, when the film is heat sealed to a second sample of the film or other polyethylene based surfaces, the peelable layer can rupture at a desired, controllable, opening force when the two films are pulled apart.
  • FIG. 3 schematically illustrates a sachet suitable for the packaging of chemically aggressive personal care products.
  • the sachet 16 is formed by heat sealing two portions of chemically resistant film 2 according to embodiments of the present invention, the heat sealing surface 120 of the inner film 12 of the composite films 2 allowing heat sealing to occur.
  • Comparative tests have shown that the chemically resistant composite films of embodiments of the present invention outperform existing known film products. For example, delamination of conventional composite film products is generally observed when exposed to aggressive chemicals after approximately seven days, whereas the chemically resistant composite films of embodiments to the present invention maintain integrity and a sufficient strength for up to 90 days.

Landscapes

  • Laminated Bodies (AREA)
  • Wrappers (AREA)

Abstract

A chemically resistant laminate film comprising an outer film including a layer of aluminium foil bonded to a heat sealable film by a chemically resistant layer, wherein the chemically resistant layer comprises an ethylene acrylic acid copolymer.

Description

Chemically Resistant Laminate Film
Within the packaging industry it is known to use laminated flexible plastic films to form closed sachets to package cosmetic and personal care products. A typical example of such packaging is for those personal care products that need to be dispensed in known quantities, for example, hair dyes where a single sachet is sized to contain a predetermined quantity of hair dye required to achieve the desired colouration. A further example of the use of such flexible films is in the formation of sample sachets used to contain a small sample of a particular cosmetic or personal care product and intended to be distributed freely as promotional samples, often being fixed to the cover of relevant magazines.
The sachets are typically formed by bonding together two sheets of laminated flexible film in discrete regions, such as around their edges, to form one or more internal pockets in which the cosmetic or personal care product is retained.
The laminated flexible films used to produce these known packaging sachets are typically formed from multiple films layered together during manufacture. More typically the composite laminated films include an inner film having a polyethylene content, the polyethylene providing strength and flexibility but also allowing adjacent composite films to be bonded to one another by heat sealing the inner films together. A middle film, typically aluminium foil, is included, the aluminium foil being provided as a non porous layer to prevent the escape of the contents from within the filled final packaging. Finally, an outer film is provided, which may include a polyester, nylon or polyolefms, onto which any desired branding or colouring may be printed. Such composite flexible films allow a wide range of packaging solutions to be adopted and the outer layers can be easily printed upon. However, such composite laminated flexible films are not particularly suitable for packaging products that include aggressive, or corrosive, chemical components. Examples of such products that contain aggressive chemical components include certain hair dyes and skin treatments. The inner polyethylene film of the conventional laminated flexible film sachets tends to be either porous to such aggressive chemicals or is directly corroded by the chemicals such that the further layers of the composite film become subject to a further attack by the aggressive chemical, leading to either complete failure of the composite film, and therefore the packaging, or partial failure of the film due to de lamination of the individual films making up the composite flexible film, when the packaging is attempted to be opened. The total or partial failure of the composite laminate films occurs within a time frame that is significantly less than the desired shelf life for the product. An existing solution to this problem of packaging chemically aggressive personal care products is to package the product within sealed aluminium tubes. However, such aluminium tubes are more expensive to manufacture and in comparison to the composite laminate film packaging are significantly less flexible in terms of the packaging products that can be formed and their intended use.
According to a first aspect of the present invention there is provided a chemically resistant laminated film comprising an outer film including a layer of aluminium foil bonded to a heat sealable film by a chemically resistant layer, wherein the chemically resistant comprises an ethylene acrylic acid polymer.
The heat sealable film may further include a second chemically resistant layer comprising a polymer of either ethylene acrylic acid or ethylene methacrylic acid. In preferred embodiments the copolymer content of the second chemically resistant layer is in the range of 6 to 20% by weight. The second chemically resistant layer may have a thickness in the range of 5 - 20 microns, with a preferred thickness of 8 microns.
In preferred embodiments the first chemically resistant layer has a thickness in the range of 5 - 30 microns, with a preferred thickness of 22 microns.
The heat sealable film may further include a heat sealing layer comprising one or more polyethylene polyolefms. The heat sealing layer may comprise a mixture of linear low density polyethylene and low density polyethylene. The heat sealable layer may additionally be peelable. The heat sealable film of the chemically resistant laminate preferably has a thickness in the range of 60 to 140 microns.
According to a second aspect of the present invention there is provided a chemically resistant sachet comprising two sheets of chemically resistant laminate film according to the first aspect of the invention having the respective heat sealable films bonded together about the periphery of the sachet.
Embodiments of the present invention are described below, by way of non limiting example only, with reference the accompanying figures, of which:
Figure 1 schematically illustrates the composition of a laminate film according to an embodiment of the present invention;
Figure 2 schematically illustrates in greater detail the composition of one of the layers of the film illustrated in Figure 1; and
Figure 3 schematically illustrates a sachet using composite films according to embodiments of the present invention.
Figure 1 schematically illustrates in cross section a portion of a composite laminate film according to an embodiment of the present invention. The laminate film 2 comprises an outer film 4 made up from an outer layer 6 that is extrusion laminated by means of an adjacent layer 8 to a further layer of aluminium foil 10. The first layer 6 of the outer film 4 may be a polyester, such as biaxially orientated polyester (PET), or alternatively a biaxially orientated nylon. The second layer 8 of the outer film, which serves the purpose of bonding the outer layer 6 to the aluminium foil 10, is preferably a polyethylene, such as low density polyethylene (LDPE). However, the bonding layer 8 may also be an ethylene vinyl acetate (EVA) copolymer (having a vinyl acetate content in the range of 4 to 20% and more preferably 4%) or be an ethylene methacrylic acid (EMA) copolymer (preferably having a methacrylic acid content in the range of 6 to 20%, with a preferred methacrylic acid content of 6%). The film 2 has an inner layer 12 comprising a cast or blown film co-extruded heat sealable film. The inner, heat sealable, layer 12 is extrusion laminated to the foil side of the outer film 4 using a chemically resistant layer 14. The chemically resistant layer 14 preferably comprises ethylene acrylic acid (EAA), but may in alternative embodiments comprise other materials having analogous chemical resistant properties to EAA.
The inner, heat sealable, layer 12 is schematically illustrated in further detail in cross section in Figure 2 and preferably comprises a heat sealing layer 120 comprising a mixture of low density poly ethylenes, such as linear low density polyethylene and low density polyethylene. An adjacent core layer 122, which provides the mechanical bulk strength and flexibility of the heat sealable film 12, preferably comprises a further mixture of medium and low density poly ethylenes. A further chemically resistant layer 124 preferably comprises ethylene acrylic acid (EAA).
In preferred embodiments the outer polyester or nylon layer has a preferred layer thickness of 12 microns, whilst the aluminium foil layer 10 has a thickness within the range of 9 microns to 25 microns, with a preferred thickness of 12 microns. The polyethylene, ethylene vinyl acetate or ethylene methacrylic acid layer 8, which laminates the outer layer 6 and the foil layer 10 together, has a preferred thickness of 16 microns. The thickness for the chemically resistant EAA layer 14 is preferably in the range of 5 - 30 microns, with a more preferred thickness of 22 microns. Referring to Figure 2, the chemically resistant layer 124 of the heat sealable film 12 preferably comprising ethylene acrylic acid EAA may alternatively comprise copolymers of ethylene acrylic acid or ethylene methacrylic acid having a respective acid contents in the range of 6 to 20%, with a preferred content of 9%. The chemically resistant layer 124 thickness is preferably in the range of 5 to 20 microns, with 8 microns being a preferred thickness. The core layer 122 may alternatively comprise low density polyethylenes, linear low density polyethylene, medium density polyethylene, linear medium density polyethylene and high density polyethylenes and mixtures thereof. As previously noted, a preferred embodiment is a mixture of linear medium density polyethylenes and linear density polyethylene with a respective mixture by weight of 70/30% with a layer thickness preferably in the range 30 to 90 microns, and more preferably a thickness of 36 microns. The heat sealing surface 120, as noted above, preferably comprises linear low density polyethylene and a low density polyethylene being a 70/30% mix by weight, but may alternatively comprise mixtures of low density polyethylene, linear low density polyethylene, medium density polyethylene, linear medium density polyethylene and high density polyethylene. The layer thickness is preferably in the range of 5 to 40 microns, with a preferred thickness of 16 microns.
The heat sealing surface 120 of the inner film 12 may alternatively comprise a peelable film. Peelability is conferred on the film by using mixtures of the following polymers: LDPE plus polystyrene, LDPE plus polybutylene, LDPE plus polypropylene or LDPE plus inorganic additives such as calcium carbonate or talcs such as calcium, aluminium or magnesium silicates. The presence of the second component in the LDPE serves to mechanically weaken the surface layer of the film such that, when the film is heat sealed to a second sample of the film or other polyethylene based surfaces, the peelable layer can rupture at a desired, controllable, opening force when the two films are pulled apart.
Figure 3 schematically illustrates a sachet suitable for the packaging of chemically aggressive personal care products. The sachet 16 is formed by heat sealing two portions of chemically resistant film 2 according to embodiments of the present invention, the heat sealing surface 120 of the inner film 12 of the composite films 2 allowing heat sealing to occur. Comparative tests have shown that the chemically resistant composite films of embodiments of the present invention outperform existing known film products. For example, delamination of conventional composite film products is generally observed when exposed to aggressive chemicals after approximately seven days, whereas the chemically resistant composite films of embodiments to the present invention maintain integrity and a sufficient strength for up to 90 days.

Claims

Claims
1. A chemically resistant laminate film comprising an outer film including a layer of aluminium foil bonded to a heat sealable film by a chemically resistant layer, wherein the chemically resistant comprises an ethylene acrylic acid copolymer.
2. The chemically resistant laminate film of claim 1, wherein the heat sealable film includes a second chemically resistant layer comprising a copolymer of either ethylene acrylic acid or ethylene methacrylic acid.
3. The chemically resistant laminate film of claim 2, wherein the copolymer content of the second chemically resistant layer is in the range of 6 to 20% by weight.
4. The chemically resistant laminate film of claims 2 or 3, wherein the second chemically resistant layer has a thickness in the range of 5 - 20 microns.
5. The chemically resistant laminate film of claim 4, wherein the second chemically resistant layer has a thickness of 8 microns.
6. The chemically resistant laminate film of any preceding claim, wherein the first chemically resistant layer has a thickness in the range of 5 - 30 microns.
7. The chemically resistant laminate film of any claim 6, wherein the first chemically resistant layer has a thickness of 22 microns.
8. The chemically resistant laminate film of any preceding claim, wherein the heat sealable film further includes a heat sealing layer comprising one or more polyethylene polyolefϊns.
9. The chemically resistant laminate film of claim 8, wherein the heat sealing layer comprises a mixture of linear low density polyethylene and low density polyethylene.
10. The chemically resistant laminate film of claim 8, wherein the heat sealing layer is peelable.
11. The chemically resistant laminate film of any preceding claim, wherein the heat sealable film has a thickness in the range of 60 to 140 microns.
12. A chemically resistant sachet comprising two sheets of chemically resistant laminate film according to any preceding claim having the respective heat sealable films bonded together about the periphery of the sachet.
EP10707952A 2009-03-03 2010-03-03 Chemically resistant laminate film Withdrawn EP2403715A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB0903655A GB2468309A (en) 2009-03-03 2009-03-03 Chemically resistant laminate film, for packaging
PCT/GB2010/050371 WO2010100490A1 (en) 2009-03-03 2010-03-03 Chemically resistant laminate film

Publications (1)

Publication Number Publication Date
EP2403715A1 true EP2403715A1 (en) 2012-01-11

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Country Status (3)

Country Link
EP (1) EP2403715A1 (en)
GB (1) GB2468309A (en)
WO (1) WO2010100490A1 (en)

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