CA2431692A1 - Multiple layer films with defined gas permeability and their use as packaging material, especially as cheese maturing packaging - Google Patents
Multiple layer films with defined gas permeability and their use as packaging material, especially as cheese maturing packaging Download PDFInfo
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- CA2431692A1 CA2431692A1 CA002431692A CA2431692A CA2431692A1 CA 2431692 A1 CA2431692 A1 CA 2431692A1 CA 002431692 A CA002431692 A CA 002431692A CA 2431692 A CA2431692 A CA 2431692A CA 2431692 A1 CA2431692 A1 CA 2431692A1
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- 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
Abstract
The invention relates to multiple layer films, comprising at least one outer seal layer, a < 10 µm thick barrier layer consisting of a partially crystalline polyamide mixture of a xylylenediamine adipate and an aliphatic polyamide containing solid, nanoscale fillers as nucleation agents, which for the number-weighted average of all of the dispersed fillers have an extension of <= 10 nm for at least one dimension and an extension of at least 100 nm for another dimension 100 nm; and a plastic support layer, with the exception of a corresponding polyamide layer.
Description
WO 02/47904 PCT/EPO1/14S$9 Multilayar films with defined gas permeability and their use as packaging material, in particular as cheese-maturing packaging The present invention relates to rnultilayer films which are not used in the usual way to minimize permeability to water vapor, gases, and aromas, but which have a defined gas permeability and thus permit contents packaged therein to enter into long-lasting, quality retaining ec~uxlibrium with the external environment.
Very many products involved in daily life, and in particular foods and drinks, are produced industrially and packaged in an extremely wide variety of films suitable for retaining the desired properties of the respective contents fox the longest possible period of time. The expiry date (ED) here is defined as the day/month/year before which a packaged product is fully satisfactory for use or consumption.
Prior art referred to is Joachim Nentwig: Kunststoff-Fvlien [Polymer fzlms], Carl-Hanser Verlag 1994, Munich, in relation to polymer films, Dr.Ing. Klaus Stoeckhert: Polyamide, Polyamidfolien 'und lPolyamid-verbundfolien [Polyamides, ~polyamide films, and polyamide composite films], Neue Verpackung 8/1984, in relation to polyamide films, H. wagner and P. Heckmann:
Orientierte Polypropylenfolien [Oriented polypropylene films], Neue Verpackung 2/1979, in relation to polypropylene films, and Dipl.-Ing. Hermann Hinsken:
Kunststoff-Verbundfolien [Polymer composite ~ilmsJ, Neue Verpackung 2/1990 in relation to polymer composite films_ f Hot-sealable packaging films are used far producing packaging which is intended for food or drink and wh~.ch serves for the storage, the distribution, and the hygienic self-service packaging of food or drink, WO 02/47904 PCT/EPOl/14589 different foods and drinks hors placing different requirements upon the gas-permeability of the packaging fzlms to be used. .
For example, the packaging of potato chips requires a packaging film impermeable to water vapor, in order to retain crispness. Baguettes or rolls packed under an inert gas atmosphere need gas-tight packaging, so that the inert gas is retained as fungistat, and so that there is no C02 loss leading to a pseudovacuum which deforms the product.
Composite films comprising a gas-barrier layer and having oxygezx permeability < 2.0 cm~/m2 x day x bar have proven successful for this purpose.
Particular requirements axe also placed upon the industrial packaging of cheese in the form of pieces, slices, or in ground or grated form, in particular when the cheese-maturing process, the duration and intensity of which differs according to type, lasts beyond the moment of packaging, meaning that the cheese continues to mature within the packaging, whereupon hermetically sealed packaging would inflate as a result of evolution of carbon dioxide.
Composite films suitable for this type of packaging are composed of a, where appropriate, printed biaxially oriented polyamide layer (PAB) as backing film with a thiclazess of 12 or 15 dun, and of olefinic sealable layers of thickness from 35 to 60 dam, the oxygen permeability of which is from 30 to 50 cm3/m2 x day x bar. For types of cheese from which gas evolution is particulaz-ly marked, or fox products known to have a short expiry time, biaxially oriented polyester films (PET) are us~d instead of PAB backing films, the resultant oxygen permeability being about 90 cm3/m2 X
Very many products involved in daily life, and in particular foods and drinks, are produced industrially and packaged in an extremely wide variety of films suitable for retaining the desired properties of the respective contents fox the longest possible period of time. The expiry date (ED) here is defined as the day/month/year before which a packaged product is fully satisfactory for use or consumption.
Prior art referred to is Joachim Nentwig: Kunststoff-Fvlien [Polymer fzlms], Carl-Hanser Verlag 1994, Munich, in relation to polymer films, Dr.Ing. Klaus Stoeckhert: Polyamide, Polyamidfolien 'und lPolyamid-verbundfolien [Polyamides, ~polyamide films, and polyamide composite films], Neue Verpackung 8/1984, in relation to polyamide films, H. wagner and P. Heckmann:
Orientierte Polypropylenfolien [Oriented polypropylene films], Neue Verpackung 2/1979, in relation to polypropylene films, and Dipl.-Ing. Hermann Hinsken:
Kunststoff-Verbundfolien [Polymer composite ~ilmsJ, Neue Verpackung 2/1990 in relation to polymer composite films_ f Hot-sealable packaging films are used far producing packaging which is intended for food or drink and wh~.ch serves for the storage, the distribution, and the hygienic self-service packaging of food or drink, WO 02/47904 PCT/EPOl/14589 different foods and drinks hors placing different requirements upon the gas-permeability of the packaging fzlms to be used. .
For example, the packaging of potato chips requires a packaging film impermeable to water vapor, in order to retain crispness. Baguettes or rolls packed under an inert gas atmosphere need gas-tight packaging, so that the inert gas is retained as fungistat, and so that there is no C02 loss leading to a pseudovacuum which deforms the product.
Composite films comprising a gas-barrier layer and having oxygezx permeability < 2.0 cm~/m2 x day x bar have proven successful for this purpose.
Particular requirements axe also placed upon the industrial packaging of cheese in the form of pieces, slices, or in ground or grated form, in particular when the cheese-maturing process, the duration and intensity of which differs according to type, lasts beyond the moment of packaging, meaning that the cheese continues to mature within the packaging, whereupon hermetically sealed packaging would inflate as a result of evolution of carbon dioxide.
Composite films suitable for this type of packaging are composed of a, where appropriate, printed biaxially oriented polyamide layer (PAB) as backing film with a thiclazess of 12 or 15 dun, and of olefinic sealable layers of thickness from 35 to 60 dam, the oxygen permeability of which is from 30 to 50 cm3/m2 x day x bar. For types of cheese from which gas evolution is particulaz-ly marked, or fox products known to have a short expiry time, biaxially oriented polyester films (PET) are us~d instead of PAB backing films, the resultant oxygen permeability being about 90 cm3/m2 X
day x bar, the increased risk of fracture on creasing being accepted here.
since biaxially oriented polyamide films are relatively S expensive and, in particular when used as a backing film, have disadvantages due to their hygroscopic properties, there is a requirement fox replacement packaging material which does not have these disadvantages, for use in the cheese-packaging industry in particular.
It was therefore an object of the present invention to provide a packaging material, in particular packaging films which have defined gas permeability and which are suitable for packaged goods which evolve gases, for example foods and drinks which continue to mature, in particular cheese, and which do not have biaxially oriented polyamide films as backing films, where the entire packaging film is intended to have defined oxygen permeability which depends on the contents, and which is intended to be in the range c 100 crn°/m2 x day x bar, particularly preferably in the range from 30 to 50 cm'/m2 x day x bar .
According to the invention, this object is achieved by providing a multilayer film which comprises at least a) one sealable layer as surface layer, b) a layer with ~a layer thickness < 10 ~,un and based on a semicrystalline polyamide mixture made from m-xylylenediamine adipate and from an aliphatic polyamide comprising dispersed, solid, anisotropic, nano-scale, nucleating fillers which, when the number average over all of the dispersed fillers is taken, measure not more than 10 nm in one of their dimensions and measure at least 100 nm in at least one other dimension and c) a backing layer made from plastic, with the exception of a biaxially or~.ented backing layer made from polyamide.
S The total thickness of the multilayer film of the invention is preferably from 30 to 90 ~,un, particularly preferably from 40 to 70 ).tm, where the layer b) made from the polyamide mixture comprising the nano-scale particles is [siG] preferably from 2 to 7 pm, particularly preferably from 3 to 5 dun.
The multilayer films of the invention have defined oxygen permeability < 100 cm3/m2 X day x bar, preferably in the range fram 20 to 60, particularly preferably from 30 to 50, cm3/m2 x day x bar. xt was entirely surprising that this could be achieved using the multilayer film structure of the invention comprising the layer b) as barrier layer with a layer thickness below 10 um, since, in contrast, when using biaxially oriented polyamide backing films, similar: oxygen permeability can only be achieved using the greater layer thickness usually used for cheese packaging.
Layer c), the backing layer, may comprise the usual plastics used for producing backing films, preferably polyesters, such as polyethylene terephthalate, or polyolefins, such as polypropylene.
The backing film preferably has biaxial orientation.
The backing film is preferably transparent. The layer thickness is preferably from 10 to 25 um, particularly preferably from 12 to 20 fun. That surface of the backing film facing away from the remainder of the film composite zaay have a sealable layer, preferably a hot-sealable layer, which may be identical with the sealable layer a).
since biaxially oriented polyamide films are relatively S expensive and, in particular when used as a backing film, have disadvantages due to their hygroscopic properties, there is a requirement fox replacement packaging material which does not have these disadvantages, for use in the cheese-packaging industry in particular.
It was therefore an object of the present invention to provide a packaging material, in particular packaging films which have defined gas permeability and which are suitable for packaged goods which evolve gases, for example foods and drinks which continue to mature, in particular cheese, and which do not have biaxially oriented polyamide films as backing films, where the entire packaging film is intended to have defined oxygen permeability which depends on the contents, and which is intended to be in the range c 100 crn°/m2 x day x bar, particularly preferably in the range from 30 to 50 cm'/m2 x day x bar .
According to the invention, this object is achieved by providing a multilayer film which comprises at least a) one sealable layer as surface layer, b) a layer with ~a layer thickness < 10 ~,un and based on a semicrystalline polyamide mixture made from m-xylylenediamine adipate and from an aliphatic polyamide comprising dispersed, solid, anisotropic, nano-scale, nucleating fillers which, when the number average over all of the dispersed fillers is taken, measure not more than 10 nm in one of their dimensions and measure at least 100 nm in at least one other dimension and c) a backing layer made from plastic, with the exception of a biaxially or~.ented backing layer made from polyamide.
S The total thickness of the multilayer film of the invention is preferably from 30 to 90 ~,un, particularly preferably from 40 to 70 ).tm, where the layer b) made from the polyamide mixture comprising the nano-scale particles is [siG] preferably from 2 to 7 pm, particularly preferably from 3 to 5 dun.
The multilayer films of the invention have defined oxygen permeability < 100 cm3/m2 X day x bar, preferably in the range fram 20 to 60, particularly preferably from 30 to 50, cm3/m2 x day x bar. xt was entirely surprising that this could be achieved using the multilayer film structure of the invention comprising the layer b) as barrier layer with a layer thickness below 10 um, since, in contrast, when using biaxially oriented polyamide backing films, similar: oxygen permeability can only be achieved using the greater layer thickness usually used for cheese packaging.
Layer c), the backing layer, may comprise the usual plastics used for producing backing films, preferably polyesters, such as polyethylene terephthalate, or polyolefins, such as polypropylene.
The backing film preferably has biaxial orientation.
The backing film is preferably transparent. The layer thickness is preferably from 10 to 25 um, particularly preferably from 12 to 20 fun. That surface of the backing film facing away from the remainder of the film composite zaay have a sealable layer, preferably a hot-sealable layer, which may be identical with the sealable layer a).
The sealable layer a) is pregerably a hot-sealable layer which forms one surface layer of the multilayer film of the invention. The layer a) is preferably composed of polyolefins, particularly preferably of polyethylene, of polypropylene, of an ethylene propylene copolymer, of a mixture of polyolefins, of an olefinic terpolymer, of a mixture of the polymers mentioned, very particularly preferably of linear iow density polyethylene (LLDPE), where appropriate mixed with palybutene, or of polyvinyl acetate.
Each of the surfaces of the layer b) of the multilayer film of the invention, which has a layer thickness of c 10 dun, preferably a layer thickness of from 2 to 7 dun, has at least one adj scent layer, meaning that the layer b) has no uncovered surface. The layer b) is based on a semicrystalline polyamide mixture made from m-xylylenediamine adipate and from an aliphatic poly-amide, and has nano-scale, solid, anisotropic particles dispersed therein and acting as nucleating fillers. The dispersed nucleating fillers are preferably solid, anisotropic particles which, when the numbex average is taken for all of the dispersed particles, measure not moxe than l0 nm in at least one freely selectable dimension, preferably for every dispersed particle. It is particularly preferable that the measurement of these particles in at least one other dimension is in the range from at least 100 nm to at most 1,000 nm.
Particular preference is given to the use of latnellar particles whose thickness is < 10 nm, e.g.
phyllosilicates. These may have been selected from the group consisting of phyllosilicates such as magnesium silicate or aluminum silicate, montmarillonite, saponite, beidellite, nontronite, hectorite, stevensite. vermiculite, halloysite, and synthetic analogues of these.
Each of the surfaces of the layer b) of the multilayer film of the invention, which has a layer thickness of c 10 dun, preferably a layer thickness of from 2 to 7 dun, has at least one adj scent layer, meaning that the layer b) has no uncovered surface. The layer b) is based on a semicrystalline polyamide mixture made from m-xylylenediamine adipate and from an aliphatic poly-amide, and has nano-scale, solid, anisotropic particles dispersed therein and acting as nucleating fillers. The dispersed nucleating fillers are preferably solid, anisotropic particles which, when the numbex average is taken for all of the dispersed particles, measure not moxe than l0 nm in at least one freely selectable dimension, preferably for every dispersed particle. It is particularly preferable that the measurement of these particles in at least one other dimension is in the range from at least 100 nm to at most 1,000 nm.
Particular preference is given to the use of latnellar particles whose thickness is < 10 nm, e.g.
phyllosilicates. These may have been selected from the group consisting of phyllosilicates such as magnesium silicate or aluminum silicate, montmarillonite, saponite, beidellite, nontronite, hectorite, stevensite. vermiculite, halloysite, and synthetic analogues of these.
The at least semicrystalline polyamide mixture ~.s preferably composed of, based on the entire mixture of the polyamides, from 60 to 98$ by weight, with preference from 65 to 85~ by weight, of a semiaromatic polyamide whose structure is composed of m-xylylenediamine and adipic acid and, based on the entire mixture of the polyamides, from 2 to 40$ by weight, preferably from 15 to 35~ by weight, of an aliphatic polyamide, such as nylon-6, nylon--11, nylon-12, nylon-6, 6, nylon-6, 10, nylon-6/5, 6, particularly preferably nylon-6, xhe layer b) comprises, based on the aliphatic polyamide component, in each case S 10~
by weight, preferably from 1 to 5~ by weight, of nano-scale, nucleating, solid particles, which are particularly preferably added at an early stage during the preparation of the respective aliphatic polyamide.
For reasons associated with process technology, each surface of the layer b) preferably has a layer a) which bas been bonded to the layer b) by way of an adhesion-promoter layer, to increase adhesion. The adhesion-promoter layer is preferably coextruded, and is preferably based on a malefic-anhydride-grafted polyethylene. To bond this composite to the respective backing film c), it is preferable to use a solvent-free polyurethane adhesive as adhesion promoter, preferably applied at a layer thickness below 5 dun.
The backing film may moreover be a pigmented, printed, or unprinted film, and the printing method here may use a gravure printing machine or a flexel (sic] printing machine. The print is preferably not arranged on the external surfac~.
The multilayer film of the invention may be produced by known techniques, such as adhesive lamination, sandwich coating, or extrusion coating, and the backing film here is preferably combined with the remainder of the WO 02/47904 pCT/Ep01/14589 film composite produced in a separate step of the process_ This can be produced with the aid of multilayer blown-film, flat-film, or coating or extrusion lamination systems, preference being given here to blown or flat film coextrusion.
The multilayer films of the invention having defined gas permeability, i.e. barrier function, within a certain gas permeability range, give excellent results when printed, since the level of hygroscvpic properties of the barrier layer has been minimized, and provide the necessary retention of pattern-repeat distance and register, and in particular in combination with a biaxially oriented polypropylene backing film, has reduced water-vapor permeability and thus reduced loss in weight from a product packaged therein, and the multilayer films of the invention are therefore particularly suitable as packaging material, very particularly preferable as packaging material for foods or drinks which evolve gases; e_g. cheese.
The present invention therefore also provides the use of the multilayer films of the invention as a packaging material, preferably for foods or drinks which evolve gases, in particular as a packaging material for cheese.
The present invention also provides a packaging made from a multilayer film of the invention for foods ox drinks which evolve gases, preferably cheese, very particularly preferably a packaging for maturing cheese. This packaging may be produced on either horizontal or vertical automatic packaging machines with the aid of the multilayer films of the invention.
WO 02/4'7904 PCT/EPO1/14589 -a Test methods Oxygen permeability is determined in accordance with the draft of DIN 53380, Part 3, 3uly 1989 issue, using the carrier gas method. It is defined as the Nml quantity of oxygen which diffuses in 24 hours through one square meter of film under a pressure difference of one bar at a prescribed temperature and humidity.
It is measured using the Oxtran 100 device from Mocon Instrument Laic]. Unless otherwise specified, oxygen permeability is stated in cm'/ma*d*bar at 23°C and 75~
relative~humidity td = day).
mhe haze stated is the quantity of light in ~ which is reemitted in the form of scattered light after the film has been illuminated by a central beats, based on the entire amount of transmitted light. The test uses Procedure A of the RSTM test standard D 100361.
The seal strength determined is the force ~.x~; N, based on the test strip width of 15 mm, required to split a seal seam produced under defined conditions (pressure, temperature, time).
Seal3.ng conditions: pressure 5 N/cm2 [sic], time 0.5 sec, temperature from 105 to I70°C, in steps of five Kelvin.
Test ecLuipment: Brugger sealer Test strip cutter with cutting width 15 mm tensile strength testing machine with measurement range 10 N
and separation velocity 100 mm/min.
Examples .All of the substances ment3.oned axe commerc:Lally available traded products.
WO 02/47904 PCT/FrP01/14589 _ g _ Example 1 An 8-layer blown-film extruder is used to caextrude a mixture of, based on the entire mixture of the polyamides, 80~ by weight of a polyamide composed of m-xylylenediamine az~d adipic acid (PA 1~D6) and, based an the entire mixture of the polyamides, 20~c by weight of nylon-6 which, based on nylon-6, [lacuna] 2$ by weight of a lamellar aluminum phyllosilicate as a central layer b) of thickness 4 ym embedded between, in each case, an adhesion-promoter layer and a layer a) composed of linear low-density polyethylene. The melt temperature was 270°C, and the expansion ratio far the coextruded blown film was 1:1.6.
The resultant blown film, separated to give two webs, electrically pre-treated on one side and Wound up, was laminated an a commercially available laminating system, using a solvent-free polyurethane adhesive (Primacor 1420 from DOW) to a polyethylene terephthalate (PET) backing film with a th:Lckz~ess og 12 ym or to a biaxially oriented polypropylene (BOPP) backing film with a layer thickness of 15 dun or to a polypropylene backing film coextruded with a sealable layer composed of polyethylene and biaxially stretched, with a thickness of 20 um.
The methods stated above were used to determine the oxygen permeability, the haze, and the seal strength of the resultant multilayer films of the invention. The appropriate values can be found in Table 1 below.
Structure of blowxa film A
LLDPE Adhesion B0~ by weight PA MXD 6*, Adhesion LLDPE
of 15 promoter 20~ by weight of nylon-6 promoter 23 a tun 4 jun with 2% by weight of 4 ~.ua nano articles 4 **
*MXD 6-6121, Mitsubishi ** Nanaparticles of aluminum silicate LLDPE - lineaz~ low-density polyethylene Table 1 Backing Blown Oxygen Haze Seal film film erm. stx.
PET 7.2 A 37 7 23 +
BOPP 15 A 42 8 25 +
Coex gOPP A 44 9 26 +
2 0 ~1m + suitable for cheese packaging in any forza PET ~ polyethylene terephthalate 30 BOPP = biaxially oriented polypropylene Coex Bopp ~- biaxially oriented coextrudate with a hot-sealable polyethylene layer of thickness 5 dun Comparative Example 1 The type of commercially availabl~ packaging film usually used for cheese packaging, composed of biaxially oriented polyamide (PAHy and of a sealable layer composed of linear low-density polyethylene exhibits the values stated in Table 2 far oxygen permeability, haze, and seal strength, these having been determined by the methods stated above.
Table 2 Backing Sealable Oxygen Haze Seal film la er perm. str.
PAB 15 um LLDPE 42 8 32 suitable for cheese packaging in any fount
by weight, preferably from 1 to 5~ by weight, of nano-scale, nucleating, solid particles, which are particularly preferably added at an early stage during the preparation of the respective aliphatic polyamide.
For reasons associated with process technology, each surface of the layer b) preferably has a layer a) which bas been bonded to the layer b) by way of an adhesion-promoter layer, to increase adhesion. The adhesion-promoter layer is preferably coextruded, and is preferably based on a malefic-anhydride-grafted polyethylene. To bond this composite to the respective backing film c), it is preferable to use a solvent-free polyurethane adhesive as adhesion promoter, preferably applied at a layer thickness below 5 dun.
The backing film may moreover be a pigmented, printed, or unprinted film, and the printing method here may use a gravure printing machine or a flexel (sic] printing machine. The print is preferably not arranged on the external surfac~.
The multilayer film of the invention may be produced by known techniques, such as adhesive lamination, sandwich coating, or extrusion coating, and the backing film here is preferably combined with the remainder of the WO 02/47904 pCT/Ep01/14589 film composite produced in a separate step of the process_ This can be produced with the aid of multilayer blown-film, flat-film, or coating or extrusion lamination systems, preference being given here to blown or flat film coextrusion.
The multilayer films of the invention having defined gas permeability, i.e. barrier function, within a certain gas permeability range, give excellent results when printed, since the level of hygroscvpic properties of the barrier layer has been minimized, and provide the necessary retention of pattern-repeat distance and register, and in particular in combination with a biaxially oriented polypropylene backing film, has reduced water-vapor permeability and thus reduced loss in weight from a product packaged therein, and the multilayer films of the invention are therefore particularly suitable as packaging material, very particularly preferable as packaging material for foods or drinks which evolve gases; e_g. cheese.
The present invention therefore also provides the use of the multilayer films of the invention as a packaging material, preferably for foods or drinks which evolve gases, in particular as a packaging material for cheese.
The present invention also provides a packaging made from a multilayer film of the invention for foods ox drinks which evolve gases, preferably cheese, very particularly preferably a packaging for maturing cheese. This packaging may be produced on either horizontal or vertical automatic packaging machines with the aid of the multilayer films of the invention.
WO 02/4'7904 PCT/EPO1/14589 -a Test methods Oxygen permeability is determined in accordance with the draft of DIN 53380, Part 3, 3uly 1989 issue, using the carrier gas method. It is defined as the Nml quantity of oxygen which diffuses in 24 hours through one square meter of film under a pressure difference of one bar at a prescribed temperature and humidity.
It is measured using the Oxtran 100 device from Mocon Instrument Laic]. Unless otherwise specified, oxygen permeability is stated in cm'/ma*d*bar at 23°C and 75~
relative~humidity td = day).
mhe haze stated is the quantity of light in ~ which is reemitted in the form of scattered light after the film has been illuminated by a central beats, based on the entire amount of transmitted light. The test uses Procedure A of the RSTM test standard D 100361.
The seal strength determined is the force ~.x~; N, based on the test strip width of 15 mm, required to split a seal seam produced under defined conditions (pressure, temperature, time).
Seal3.ng conditions: pressure 5 N/cm2 [sic], time 0.5 sec, temperature from 105 to I70°C, in steps of five Kelvin.
Test ecLuipment: Brugger sealer Test strip cutter with cutting width 15 mm tensile strength testing machine with measurement range 10 N
and separation velocity 100 mm/min.
Examples .All of the substances ment3.oned axe commerc:Lally available traded products.
WO 02/47904 PCT/FrP01/14589 _ g _ Example 1 An 8-layer blown-film extruder is used to caextrude a mixture of, based on the entire mixture of the polyamides, 80~ by weight of a polyamide composed of m-xylylenediamine az~d adipic acid (PA 1~D6) and, based an the entire mixture of the polyamides, 20~c by weight of nylon-6 which, based on nylon-6, [lacuna] 2$ by weight of a lamellar aluminum phyllosilicate as a central layer b) of thickness 4 ym embedded between, in each case, an adhesion-promoter layer and a layer a) composed of linear low-density polyethylene. The melt temperature was 270°C, and the expansion ratio far the coextruded blown film was 1:1.6.
The resultant blown film, separated to give two webs, electrically pre-treated on one side and Wound up, was laminated an a commercially available laminating system, using a solvent-free polyurethane adhesive (Primacor 1420 from DOW) to a polyethylene terephthalate (PET) backing film with a th:Lckz~ess og 12 ym or to a biaxially oriented polypropylene (BOPP) backing film with a layer thickness of 15 dun or to a polypropylene backing film coextruded with a sealable layer composed of polyethylene and biaxially stretched, with a thickness of 20 um.
The methods stated above were used to determine the oxygen permeability, the haze, and the seal strength of the resultant multilayer films of the invention. The appropriate values can be found in Table 1 below.
Structure of blowxa film A
LLDPE Adhesion B0~ by weight PA MXD 6*, Adhesion LLDPE
of 15 promoter 20~ by weight of nylon-6 promoter 23 a tun 4 jun with 2% by weight of 4 ~.ua nano articles 4 **
*MXD 6-6121, Mitsubishi ** Nanaparticles of aluminum silicate LLDPE - lineaz~ low-density polyethylene Table 1 Backing Blown Oxygen Haze Seal film film erm. stx.
PET 7.2 A 37 7 23 +
BOPP 15 A 42 8 25 +
Coex gOPP A 44 9 26 +
2 0 ~1m + suitable for cheese packaging in any forza PET ~ polyethylene terephthalate 30 BOPP = biaxially oriented polypropylene Coex Bopp ~- biaxially oriented coextrudate with a hot-sealable polyethylene layer of thickness 5 dun Comparative Example 1 The type of commercially availabl~ packaging film usually used for cheese packaging, composed of biaxially oriented polyamide (PAHy and of a sealable layer composed of linear low-density polyethylene exhibits the values stated in Table 2 far oxygen permeability, haze, and seal strength, these having been determined by the methods stated above.
Table 2 Backing Sealable Oxygen Haze Seal film la er perm. str.
PAB 15 um LLDPE 42 8 32 suitable for cheese packaging in any fount
Claims (14)
1. A multilayer film comprising a) at least one sealable layer as surface layer, b) a layer with a layer thickness < 10 µm and based on a semicrystalline polyamide mixture made from m-xylylenediamine adipate and from an aliphatic polyamide comprising dispersed, solid, anisotropic, nano-scale, nucleating fillers which, when the number average over all of the dispersed fillers is taken, measure not more than 10 nm in one of their dimensions and measure at least 100 nm in at least one other dimension and c) a backing layer made from plastic, with the exception of a biaxially oriented backing layer made from polyamide
2. The multilayer film as claimed in claim 1, characterized in that the thickness of the layer b) is in the range from 2 to 7 µm, preferably from 3 to 5 µm.
3. The multilayer film as claimed in claim 1 or 2, which has oxygen permeability of < 100 cm3/m2 X day x bar, preferably from 20 to 60 cm3/m2 x day x bar.
4. The multilayer film as claimed in any of claims 1 to 3, characterized in that the sealable layer a) is composed of a polyvinyl acetate, of a poly-olefin, preferably of polyethylene, of poly-propylene, of an ethylene-propylene copolymer, of an olefinic terpolymer, of a mixture of poly-olefins, particularly preferably of a linear low-density polyethylene (LLDPE).
5. The multilayer film as claimed in any of claims 1 to 4, characterized in that the layer b) is composed of a polyamide mixture made from, based on the entire mixture of the polyamides, from 60 to 98% by weight, preferably from 65 to 85% by weight, of m-xylylenediamine adipate, and, based on the entire mixture of the polyamides, from 2 to 40% by weight, preferably from 15 to 35% by weight, of an aliphatic polyamide, preferably nylon-6, and ~ 10% by weight, preferably from 1 to 5% by weight, based on the aliphatic polyamide component, of the nano-scale fillers.
6. The multilayer film as claimed in any of claims 1 to 5, characterized in that the nano-scale fillers are lamellar.
7. The multilayer film as claimed in claim 6, characterized in that the fillers axe composed of natural or synthetic phyllosilicates.
8. The multilayer film as claimed in any of claims 1 to 7, characterized in that the aliphatic polyamide has been prepared in the presence of the dispersed, nano-scale fillers.
9. The multilayer film as claimed in any of claims 1 to 8, characterized in that the layer c) is composed of polyester, preferably polyethylene terephthalate, or a polyolefin, preferably polypropylene.
10. The multilayer film as claimed in any of claims 1 to 9, characterized in that the backing layer has biaxial orientation.
11. The multilayer film as claimed in any of claims 1 to 10, characterized in that each of the surfaces of the layer b) has been bonded to a layer a), in each case by way of an adhesion-promoter layer.
12. The multilayer film as claimed in any of claims 1 to 11, characterized in that the total thickness of the film is in the range from 30 to 90 µm.
13. The use of the multilayer film as claimed in any of claims 1 to 12 as, or in, packaging material, preferably as, or in, packaging films.
14. A cheese-maturing packaging made from the multi-layer film as claimed in any of claims 1 to 12.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE2000162417 DE10062417A1 (en) | 2000-12-14 | 2000-12-14 | Heat-sealable multilayer films with defined gas permeability and their use as packaging material, in particular cheese packaging |
| DE10062417.0 | 2000-12-14 | ||
| PCT/EP2001/014589 WO2002047904A2 (en) | 2000-12-14 | 2001-12-12 | Multiple layer films with defined gas permeability and their use as packaging material, especially as cheese maturing packaging |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2431692A1 true CA2431692A1 (en) | 2002-06-20 |
Family
ID=7667191
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002431692A Abandoned CA2431692A1 (en) | 2000-12-14 | 2001-12-12 | Multiple layer films with defined gas permeability and their use as packaging material, especially as cheese maturing packaging |
Country Status (8)
| Country | Link |
|---|---|
| EP (1) | EP1358070A2 (en) |
| AU (1) | AU2002229652A1 (en) |
| CA (1) | CA2431692A1 (en) |
| DE (1) | DE10062417A1 (en) |
| NO (1) | NO20032660L (en) |
| PL (1) | PL362180A1 (en) |
| RU (1) | RU2003120515A (en) |
| WO (1) | WO2002047904A2 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7833594B2 (en) * | 2002-09-26 | 2010-11-16 | Casematic, S.A. De C.V. | Polymer based sausage casing |
| US20140050823A1 (en) * | 2002-09-26 | 2014-02-20 | Ruben Garcia Cruz | Polymer-Based Sausage Casing |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102005023337A1 (en) * | 2005-05-17 | 2006-11-23 | Wipak Walsrode Gmbh & Co.Kg | Thermoformable laminated film, used for packaging, including deep drawn packaging, especially for perishable food has internal printed image between outer carrier and sealing layers |
| WO2009047332A2 (en) * | 2007-10-12 | 2009-04-16 | Dsm Ip Assets B.V. | Process for foil ripening of cheese |
| US9192175B2 (en) * | 2009-02-17 | 2015-11-24 | Dsm Ip Assets B.V. | Process for foil ripening of cheese |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4980407A (en) * | 1988-10-21 | 1990-12-25 | Toyoda Gosei Co., Ltd. | Polyamide resin composition |
| EP0585459A4 (en) * | 1992-03-18 | 1994-08-24 | Sumitomo Bakelite Co | Multilayered stretched film |
| JP3037549B2 (en) * | 1994-03-04 | 2000-04-24 | 住友ベークライト株式会社 | Multilayer film |
-
2000
- 2000-12-14 DE DE2000162417 patent/DE10062417A1/en not_active Withdrawn
-
2001
- 2001-12-12 WO PCT/EP2001/014589 patent/WO2002047904A2/en not_active Application Discontinuation
- 2001-12-12 AU AU2002229652A patent/AU2002229652A1/en not_active Abandoned
- 2001-12-12 RU RU2003120515/04A patent/RU2003120515A/en not_active Application Discontinuation
- 2001-12-12 CA CA002431692A patent/CA2431692A1/en not_active Abandoned
- 2001-12-12 EP EP01990550A patent/EP1358070A2/en not_active Withdrawn
- 2001-12-12 PL PL36218001A patent/PL362180A1/en unknown
-
2003
- 2003-06-12 NO NO20032660A patent/NO20032660L/en not_active Application Discontinuation
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7833594B2 (en) * | 2002-09-26 | 2010-11-16 | Casematic, S.A. De C.V. | Polymer based sausage casing |
| US20140050823A1 (en) * | 2002-09-26 | 2014-02-20 | Ruben Garcia Cruz | Polymer-Based Sausage Casing |
Also Published As
| Publication number | Publication date |
|---|---|
| PL362180A1 (en) | 2004-10-18 |
| AU2002229652A1 (en) | 2002-06-24 |
| NO20032660D0 (en) | 2003-06-12 |
| EP1358070A2 (en) | 2003-11-05 |
| DE10062417A1 (en) | 2002-06-20 |
| WO2002047904A2 (en) | 2002-06-20 |
| NO20032660L (en) | 2003-06-16 |
| WO2002047904A3 (en) | 2002-08-29 |
| RU2003120515A (en) | 2005-03-10 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| FZDE | Discontinued |