Construct

Abstract

The present invention provides a multilayer film construction comprising: (i) a first layer comprising a cyclic olefin copolymer; (ii) a second layer comprising a polyethylene; and (iii) a third layer comprising a polymer having a heat seal initiation temperature of about 170° C. or less; wherein the second layer is disposed between the first layer and the third layer.

Description

Detailed Description of the Invention

[0001] [Technical field] The present invention relates to a multilayer film construction, a method for making the multilayer film construction, a laminate comprising the multilayer film construction, and uses thereof.

[0002] [Background technology] Food and beverage products are often packaged using laminated film constructions and may be packaged as "single-serve" or "multi-serve" products. A single-serve product contains a single serving or portion size of a food or beverage product contained within a package, while a multi-serve product contains multiple servings or portions of the product within a package. The packaging of a multi-serve product may be resealable.

[0003] Packaging laminates often contain plastic polymers such as polypropylene and polyethylene. These materials have recently been attracting attention due to their recyclability. However, it has been found that conventionally known packaging materials containing polypropylene and / or polyethylene encounter problems of delamination due to inconsistent bonds formed after sealing, inconsistent machine flow, and relatively low barrier properties. Such packaging materials may also have a relatively high tear strength, which may make it more difficult for users to tear the packaging by hand in a straight line to open it.

[0004] More recently, polyethylene has received particular attention because it is considered to be more widely recyclable than polypropylene or polyolefins, However, in the history of barrier development, polyethylene films have proven to be problematic, as such films can have a relatively high permeability to moisture and gases.

[0005] It is generally desirable for such packaging materials to limit the amount of oxygen, water vapor, and other gases or fluids that can permeate to the product contained within the package, as these can cause undesirable reactions with the product within the package, resulting in spoilage. For example, oxidative degradation can affect the flavor and color of food and beverage products such as coffee, tea, chocolate, meat, cheese, etc. Oxidative degradation can also result in enhanced microbial growth within a short period of time.

[0006] It is therefore desirable to reduce the permeability of packaging films to these gases in order to extend the shelf-life of food or beverage products contained within the packaging films.

[0007] [Summary of the Invention] In one aspect, there is provided a multilayer film construction comprising: (i) a first layer comprising a cyclic olefin copolymer; (ii) a second layer comprising polyethylene; and (iii) a third layer comprising a polymer having a heat seal initiation temperature of about 170° C. or less; Equipped with The second layer is disposed between the first layer and the third layer. A multi-layer film construction is provided.

[0008] In one aspect, there is provided a multilayer film construction comprising: (i) a first layer comprising a cyclic olefin copolymer; (ii) a second layer comprising polyethylene; and (iii) a third layer comprising a polymer having a heat seal initiation temperature of about 170° C. or less; Equipped with the second layer is disposed between the first layer and the third layer; The multilayer film construction has a yield of approximately 0.5 g / m per day. 2 The water vapor transmission rate is as follows: A multi-layer film construction is provided.

[0009] In one aspect, there is provided a method of making the multilayer film construction described above, comprising the steps of: (a) providing a first layer, a second layer, and a third layer in separate containers; (b) melting the polymers of the first layer, the second layer, and the third layer in separate containers; and (c) combining the first layer, the second layer, and the third layer to form a multilayer film construction; A method is provided, comprising:

[0010] In one embodiment, there is provided a laminate comprising: (a) a first barrier layer comprising the metallized multilayer film construction described herein; (b) a second barrier layer comprising a metallized oriented polypropylene; and (c) a printable outer layer comprising a polymer selected from oriented polypropylene, oriented polyethylene, and combinations thereof; A laminate is provided comprising:

[0011] In one aspect, there is provided the use of a cyclic olefin copolymer in a multi-layer film construction comprising polyethylene to improve the adhesion of the film construction to a metal layer.

[0012] In one embodiment, 0.1 g / m per day 2 Provided is the use of a cyclic olefin copolymer to provide a metallized film construction having the following water vapor transmission rate, the metallized film construction comprising the cyclic olefin copolymer:

[0013] As described herein, the present invention provides a multi-layer film construction that has excellent barrier properties while also having high bond strength and relatively low tear strength, allowing packages made from the film construction to be relatively easy to manually tear open in a linear fashion.

[0014] For ease of reference, these and further aspects of the present invention are now described under appropriate section headings, however, the teachings under each section are not necessarily limited to each particular section.

[0015] Embodiments of the present invention will now be described, by way of example only, with reference to the accompanying drawings, in which: [Brief description of the drawings]

[0016] [Figure 1] 1 illustrates an embodiment of a multilayer film construction comprising a first layer, a second layer, and a third layer. [Diagram 2] 1 illustrates an embodiment of a multilayer film construction comprising a first layer, a second layer, and a third layer, as well as a printable exterior layer and a metal layer. [Diagram 3] 1 illustrates an embodiment of a laminate comprising a first barrier layer, a second barrier layer, and a printable outer layer. [Figure 4] 1 illustrates another embodiment of a laminate further comprising an additional layer comprising polyethylene.

[0017] While the invention is susceptible to various modifications and alternative forms, specific embodiments have been shown by way of example in the drawings and are herein described in detail. It should be understood, however, that the drawings of the specific embodiments and the detailed description are not intended to limit the invention to the particular forms disclosed. On the contrary, the invention covers all modifications, equivalents, and alternatives falling within the scope of the invention as defined by the appended claims.

[0018] [Mode for carrying out the invention] Construct As discussed herein, one aspect of the invention is a multilayer film construction comprising: (i) a first layer comprising a cyclic olefin copolymer; (ii) a second layer comprising polyethylene; and (iii) a third layer comprising a polymer having a heat seal initiation temperature of about 170° C. or less; Equipped with The second layer is disposed between the first layer and the third layer. A multi-layer film construction is provided.

[0019] First layer As described herein, the first layer in the multilayer film construction comprises a cyclic olefin copolymer (COC). COCs are typically amorphous polymers made by chain copolymerization of cyclic monomers with linear monomers (e.g., ethylene) using conventional and / or metallocene initiators. The cyclic monomers can be selected from any suitable cyclic monomers, such as norbornene, tetracyclododecene (e.g., 1,2,3,4,4a,5,8,8a-octahydro-1,4:5,8-dimethanonaphthalene), or other derivatives of norbornene.

[0020] When ethylene is used as the linear monomer and norbornene is used as the cyclic monomer, the COC can have the following chemical structure, where the ethylene structure is designated by "x" and the norbornene structure is designated by "y". [ka]

[0021] Methods for producing COC resins are known to those skilled in the art. Typically, COC can be produced by copolymerizing ethylene with norbornene (or its derivatives) in the presence of a metallocene catalyst.

[0022] In some embodiments, the COC has a molecular weight of about 1 to about 200 cm when measured at 260° C. and 2.16 kg. 3 In some embodiments, the COC has a volume flow rate (melt volume-flow rate, MVR) of about 1 to about 50 cm when measured at 260° C. and 2.16 kg. 3In some embodiments, the COC has a volume flow rate (melt volume flow rate, MVR) of, for example, about 5 to about 35 cm when measured at 260° C. and 2.16 kg. 3 / 10 minutes, etc., about 2 to about 40 cm 3 In some embodiments, the COC has an MVR of, for example, about 2 to about 20 cm when measured at 230° C. and 2.16 kg. 3 / 10 minutes, for example, about 5 to 15 cm 3 / 10 minutes, for example, about 10 to 15 cm 3 When measured at 230°C and 2.16 kg for 10 minutes, the 3 In some preferred embodiments, the COC has an MVR of about 12 cm when measured at 230° C. and 2.16 kg. 3 In some embodiments, the COC has an MVR of, for example, about 0.5 to about 15 cm when measured at 190° C. and 2.16 kg. 3 / 10 minutes, for example, about 1 to about 10 cm 3 / 10 minutes, for example, about 1.5 to about 5 cm 3 When measured at 190°C and 2.16 kg for 10 minutes, the 3 In some preferred embodiments, the COC has an MVR of about 2 cm when measured at 190° C. and 2.16 kg. 3 / 10 minutes. MVR can be measured using test method ISO 1133.

[0023] In some embodiments, the COC has a melt flow index (or melt flow rate) of about 1 g / 10 min to about 50 g / 10 min when measured at 260° C. and 2.16 kg, such as about 10 to about 30 g / 10 min when measured at 230° C. and 2.16 kg. In some embodiments, the COC has a melt flow index (or melt flow rate) of about 10 g / 10 min to about 15 g / 10 min when measured at 230° C. and 2.16 kg. Preferably, the COC has a melt flow index of about 10 g / 10 min to about 12 g / 10 min when measured at 230° C. and 2.16 kg. In some embodiments, the COC has a melt flow index (or melt flow rate) of about 0.1 g / 10 min to about 5 g / 10 min when measured at 190° C. and 2.16 kg. Preferably, the COC has a melt flow index of about 0.5 g / 10 min to about 2.5 g / 10 min when measured at 190° C. and 2.16 kg. Preferably, the COC has a melt flow index of about 1 g / 10 min to about 2 g / 10 min when measured at 190° C. and 2.16 kg, more preferably about 1.5 to about 2 g / 10 min when measured at 190° C. and 2.16 kg. In some preferred embodiments, the COC has a melt flow index of about 1.9 g / 10 min when measured at 190° C. and 2.16 kg. The melt flow index can be calculated from the ISO 1133 MVR using a melt density of 0.92.

[0024] In some embodiments, the COC has a heat deflection temperature (HDT / B(0.45 MPa)) of about 50 to about 200°C, such as about 75 to about 175°C. HDT / B can be measured using ISO 75, Part 1 and Part 2. In some embodiments, the COC has a heat deflection temperature (HDT / B(0.45 MPa)) of about 50 to about 100°C.

[0025] In some embodiments, the COC has a glass transition temperature of up to about 180°C. In some embodiments, the COC has a glass transition temperature of about 50 to about 180°C, such as about 60 to about 150°C, such as about 70 to about 125°C, such as about 75 to about 100°C. In some preferred embodiments, the COC has a glass transition temperature of about 50 to about 100°C. In some preferred embodiments, the COC has a glass transition temperature of about 60 to about 80°C. The glass transition temperature can be measured using ISO 11357-1, ISO 11357-2, ISO 11357-3. In some preferred embodiments, the COC can have a glass transition temperature of about 78°C.

[0026] In some embodiments, the COC included in the first layer may be selected from COC manufactured by TOPAS Advanced Polymers (e.g., TOPAS®), COC manufactured by Mitsui Chemicals (e.g., Apel®), or mixtures thereof. In some embodiments, the COC may be selected from TOPAS grades 8007, 5013, 6013, 6015, 6017, or mixtures thereof. In some embodiments, the COC may be selected from TOPAS® 8007F-600, TOPAS® 9506F-500, TOPAS® 7010F-600, TOPAS® 6013F-04, or mixtures thereof. In some embodiments, the COC may be TOPAS® 8007F-600.

[0027] In some embodiments, the first layer comprises COC in an amount of at least about 50% by weight of the first layer, such as at least about 60% by weight of the first layer, for example at least about 70% by weight of the first layer, for example at least about 80% by weight of the first layer, for example at least about 90% by weight of the first layer, for example at least about 95% by weight of the first layer, for example at least about 98% by weight of the first layer, for example at least about 99% by weight of the first layer.

[0028] In some preferred embodiments, the first layer consists of COC (i.e., the first layer comprises COC in an amount of 100% by weight of the first layer). It has been found that when COC is present as 100% by weight of the first layer, the water vapor transmission rate and oxygen transmission rate can be lower compared to when a lower amount of COC is used.

[0029] In some embodiments, the first layer comprises COC in an amount of at least about 5% by weight of the sum of components (i), (ii) and (iii), or the first layer consists of COC in an amount of at least about 5% by weight of the sum of components (i), (ii) and (iii). In some embodiments, the first layer comprises COC in an amount of about 5% to about 80% by weight of the sum of components (i), (ii) and (iii). In some embodiments, the first layer comprises COC in an amount of about 6% to about 70% by weight, such as about 7% to about 60% by weight, such as about 8% to about 50% by weight, of the sum of components (i), (ii) and (iii). In some embodiments, the first layer comprises COC in an amount of about 5% to about 50% by weight, such as about 6% to about 40% by weight, such as about 7% to about 30% by weight, such as about 8% to about 20% by weight, such as about 8% to about 15% by weight, such as about 8% to about 10% by weight, such as about 8% by weight, of the sum of components (i), (ii) and (iii). In some preferred embodiments, the first layer comprises COC in an amount of about 5% to about 20% by weight, more preferably about 5% to about 15% by weight, of the sum of components (i), (ii) and (iii). In each of these embodiments, the COC may be present in an amount of 100% by weight of the first layer (i.e., the first layer may consist of COC).

[0030] In some embodiments, the construct comprises the first layer in an amount of about 5% to about 80% by weight based on the total weight of layers (i), (ii), and (iii). In some embodiments, the construct comprises the first layer in an amount of about 5% to about 60% by weight, preferably about 5% to about 20% by weight, more preferably about 5% to about 15% by weight, and even more preferably about 8% by weight, based on the total weight of layers (i), (ii), and (iii). In some embodiments, the construct comprises the first layer in an amount of about 5% by weight based on the total weight of layers (i), (ii), and (iii).

[0031] It has been found that the inclusion of COG in the first layer can provide a multilayer film construction with excellent barrier properties while also having high bond strength and relatively low tear strength, making it relatively easy to manually tear open a package made from the film construction in a linear fashion. The COG in the first layer also allows for improved adhesion of the polyethylene in the second layer to any metal that may be included for metallization of the construction. This improved adhesion can allow for more uniform bond strength between layers in the construction.

[0032] Additionally, it has been found that including a COC in the construct can result in a reduction in the tear strength of the construct, thereby allowing the user to more easily tear the construct in a straight line, which is generally advantageous when the construct is used in a package that is opened by the user manually tearing.

[0033] Second layer As described herein, the second layer in the multilayer film construction comprises polyethylene (PE). Preferably, the second layer consists of PE.

[0034] The polyethylene included in the second layer can be any suitable type of polyethylene. In some embodiments, the polyethylene is selected from the group consisting of ultra-high molecular weight polyethylene (UHMWPE), ultra-low molecular weight polyethylene (ULMWPE), high molecular weight polyethylene (HMWPE), high density polyethylene (HDPE), high density cross-linked polyethylene (HDXLPE), cross-linked polyethylene (PEX), medium density polyethylene (MDPE), linear low density polyethylene (LLDPE), low density polyethylene (LDPE), very low density polyethylene (VLDPE), chlorinated polyethylene (CPE), and combinations thereof.

[0035] In some preferred embodiments, the second layer comprises or consists of a polyethylene selected from HDPE, LLDPE, LDPE, MDPE, and combinations thereof. Preferably, the second layer comprises or consists of a polyethylene selected from HDPE, MDPE, LLDPE, or combinations thereof. Preferably, the second layer comprises or consists of a polyethylene selected from MDPE, LLDPE, or combinations thereof. In some embodiments, the second layer comprises or consists of a polyethylene selected from MDPE, LLDPE, or combinations thereof. In some embodiments, the second layer comprises or consists of MDPE. In some embodiments, the second layer comprises or consists of LLDPE. In some embodiments, the second layer comprises or consists of LDPE. In some embodiments, the second layer comprises or consists of HDPE.

[0036] In some preferred embodiments, the second layer comprises or consists of a polyethylene that is a combination of MDPE and LLDPE. The MDPE and LLDPE can be present in any suitable weight ratio. In some embodiments, the MDPE and LLDPE are present in the second layer in an amount such that the weight ratio of MDPE to LLDPE is about 90:10 to about 10:90, preferably about 70:30 to about 30:70, and more preferably about 60:40 to about 40:60.

[0037] In some embodiments, the second layer is comprised of HDPE, MDPE, LLDPE, LDPE, or a combination thereof. Preferably, the second layer is comprised of MDPE. In other preferred embodiments, the second layer is comprised of LLDPE.

[0038] LDPE is typically 0.91 to 0.925 g / cm 3 LDPE is a type of polyethylene defined by a density range of 0.91 to 0.94 g / cm. LDPE can be produced using conventional processes known to those skilled in the art, such as high-pressure processes by free-radical polymerization of ethylene. LLDPE is another form of low-density PE, and differs from LDPE in that it is typically substantially linear with many short branches, but does not have significant amounts of long-chain branching. LLDPE typically has a density range of 0.91 to 0.94 g / cm. 3 LLDPE is typically produced by copolymerization of ethylene with long chain olefins and initiation with a transition metal catalyst such as a Ziegler or Phillips type catalyst. MDPE typically has a density of 0.926-0.94 g / cm 3 HDPE has a density in the range of 0.941 g / cm and can be produced by chromium / silica, Ziegler-Natta or metallocene catalysts. HDPE typically has a density in the range of 0.941 g / cm 3 and typically has a density of 0.94 to 0.97 g / cm 3HDPE typically has little branching which results in stronger intermolecular forces and tensile strength than LDPE. HDPE can be produced by any conventional synthesis, for example using chromium / silica, Ziegler-Natta or metallocene catalysts.

[0039] In some embodiments, the polyethylene has a melt flow index of about 1.5 g / 10 min to about 3 g / 10 min when measured at 190° C. and 2.16 kg. Preferably, the polyethylene has a melt flow index of about 1.5 g / 10 min to about 2.5 g / 10 min when measured at 190° C. and 2.16 kg. Preferably, the polyethylene has a melt flow index of about 2 g / 10 min to about 2.5 g / 10 min when measured at 190° C. and 2.16 kg, more preferably about 2.5 g / 10 min when measured at 190° C. and 2.16 kg. Melt flow index can be measured using test method ASTM D1238.

[0040] In some embodiments, the polyethylene has a viscosity of about 0.91 to about 0.97 g / cm 3 In some preferred embodiments, the polyethylene has a density of about 0.91 to 0.94 g / cm 3 , preferably 0.915 to 0.935 g / cm 3 , more preferably 0.92 to 0.935 g / cm 3 The density can be measured by ASTM D792.

[0041] In some embodiments, the second layer is or comprises LLDPE Dow Dowlex™ 2036. LLDPE Dow Dowlex™ 2036 has a viscosity of 0.935 g / cm 3 and a melt flow index of 2.5 g / 10 min when measured at 190° C. and 2.16 kg.

[0042] In some embodiments, the second layer comprises polyethylene (e.g., HDPE, LLDPE, and / or MDPE) in an amount of at least about 70% by weight of the second layer, such as at least about 80% by weight of the second layer, such as at least about 90% by weight of the second layer, such as at least about 95% by weight of the second layer, such as at least about 98% by weight of the second layer, such as at least about 99% by weight of the second layer. In some preferred embodiments, the second layer comprises polyethylene (e.g., HDPE, LLDPE, and / or MDPE) in an amount of about 90% to about 99% by weight of the second layer. In some preferred embodiments, the second layer consists of polyethylene (e.g., HDPE, LLDPE, and / or MDPE).

[0043] In some embodiments, the second layer comprises or consists of polyethylene (such as HDPE, LLDPE and / or MDPE) in an amount of at least 50% by weight of the sum of components (i), (ii) and (iii). In some embodiments, the second layer comprises polyethylene (such as HDPE, LLDPE and / or MDPE) in an amount of at least 50% by weight of the sum of components (i), (ii) and (iii). In some embodiments, the second layer comprises polyethylene (such as HDPE, LLDPE and / or MDPE) in an amount of about 50% to about 95% by weight of the sum of components (i), (ii) and (iii). Preferably, the second layer comprises polyethylene (such as HDPE, LLDPE, and / or MDPE) in an amount of about 60% to about 80% by weight of the sum of components (i), (ii), and (iii), more preferably about 65% to about 75% by weight, and most preferably about 67% to about 70% by weight of the sum of components (i), (ii), and (iii). In each of these embodiments, the polyethylene (such as HDPE, LLDPE, and / or MDPE) may be present in an amount of about 90% to about 100% by weight of the second layer, such as about 90% to about 99% by weight of the second layer. Alternatively, in each of these embodiments, the polyethylene (such as HDPE, LLDPE, and / or MDPE) may be present in an amount of 100% by weight of the second layer (i.e., the second layer may consist of polyethylene).

[0044] In some embodiments, the construct comprises the second layer in an amount of about 30% to about 95% by weight based on the total weight of layers (i), (ii), and (iii). In some embodiments, the construct comprises the second layer in an amount of about 30% to about 90% by weight, preferably about 60% to 80% by weight, more preferably about 65% to about 75% by weight, and even more preferably about 67% by weight, based on the total weight of components (i), (ii), and (iii).

[0045] It has been found that including polyethylene in the second layer can improve the stiffness and machinability of the film construction.

[0046] In some embodiments, the second layer may further comprise an additive or auxiliary. For example, the second layer may comprise an anti-blocking agent or slip agent. In some embodiments, the second layer further comprises an anti-blocking agent. The slip agent or anti-blocking agent may be any suitable additive known in the art.

[0047] In some embodiments, the second layer comprises (a) a polyethylene (such as LLDPE and / or MDPE) in an amount of about 90% to about 100% by weight of the second layer, and (b) an antiblocking agent in an amount of about 0% to 10% by weight of the second layer. In some embodiments, the second layer comprises (a) a polyethylene (such as LLDPE and / or MDPE) in an amount of about 90% to about 99% by weight of the second layer, and (b) an antiblocking agent in an amount of about 1% to 5% by weight of the second layer.

[0048] The third layer As described herein, the third layer in the multilayer film construction comprises a polymer having a heat seal initiation temperature of about 170° C. or less.

[0049] The polymer included in the third layer may be any suitable polymer having such a heat seal initiation temperature. Thus, the polymer of the third layer may provide an acceptable seal when a relatively low temperature is applied. Using a relatively low temperature to form the seal may be advantageous because it means that the first and second layers do not need to be heated to too high a temperature that may adversely affect (e.g., by heat shrinkage or distortion) the properties of the polymers of the first and second layers. For example, the seal may be formed at a temperature not exceeding 170°C, preferably not exceeding 150°C, more preferably not exceeding 135°C. The seal may be formed at a temperature in the range of about 80 to about 150°C, for example about 90 to about 140°C, and thus may not adversely affect the properties of the first and second layers.

[0050] In some embodiments, the polymer having a heat seal initiation temperature of about 170° C. or less may be a polyolefin plastomer. As one skilled in the art will appreciate, a plastomer is a polymeric material that combines the qualities of an elastomer with the qualities of a plastic. Polyolefin plastomers (POPs) are typically ethylene- or propylene-based random copolymers that may be produced from a single-site catalyst. POPs may include ethylene or propylene monomers copolymerized with linear alpha-olefin monomers such as propylene, ethylene, butene, hexane, or octene. For example, ethylene-based POPs may include ethylene combined with linear alpha-olefins such as butene, hexene, or octene. Propylene-based POPs may include propylene combined with ethylene or butene. POPs typically have a viscosity of 0.886 to 0.912 g / cm 3 It has a density in the range of

[0051] In some embodiments, the polymer having a heat seal initiation temperature of about 170° C. or less may be an ethylene-based polyolefin plastomer. The polyolefin plastomer may be a copolymer of ethylene and one or more of butene, hexene, or octene. Preferably, the polyolefin plastomer may be a copolymer of ethylene and octene.

[0052] In some embodiments, the third layer comprises a polymer (preferably a polyolefin plastomer) having a heat seal initiation temperature of about 150° C. or less. In some embodiments, the third layer comprises a polymer (preferably a polyolefin plastomer) having a heat seal initiation temperature of about 135° C. or less. In some embodiments, the third layer comprises a polymer (preferably a polyolefin plastomer) having a heat seal initiation temperature of about 125° C. or less, preferably about 110° C. or less, more preferably about 100° C. or less, even more preferably about 90° C. or less. It may be advantageous if the polymer (such as a polyolefin plastomer) has a heat seal initiation temperature of about 85° C. or less.

[0053] In some preferred embodiments, the third layer comprises a polymer (preferably a polyolefin plastomer) that has a heat seal initiation temperature of about 110° C. or less.

[0054] In some embodiments, the third layer comprises a polymer (preferably a polyolefin plastomer) having a heat seal initiation temperature of about 50°C to about 170°C, such as about 50°C to about 150°C, for example about 60°C to about 125°C, preferably about 70°C to about 110°C, more preferably about 75°C to about 100°C, and even more preferably about 80°C to about 90°C. In some embodiments, the third layer comprises a polymer (preferably a polyolefin plastomer) having a heat seal initiation temperature of about 80°C to about 110°C, preferably about 80°C to about 100°C. It may be advantageous if the polymer (preferably a polyolefin plastomer) has a heat seal initiation temperature of about 85°C.

[0055] The third layer may include a polyolefin plastomer having a heat seal initiation temperature within any of the ranges described above, such as from about 80°C to about 100°C.

[0056] In some embodiments, the polymer (preferably a polyolefin plastomer) having a heat seal initiation temperature of about 170° C. or less may have a melt flow index of 0.5 to 3 g / 10 min when measured at 190° C. and 2.16 kg, preferably about 1 to 2 g / 10 min when measured at 190° C. and 2.16 kg.

[0057] In some embodiments, the polymer (preferably a polyolefin plastomer) having a heat seal initiation temperature of about 170° C. or less has a coefficient of friction of about 0.10 to about 0.25, preferably about 0.15 to about 2, and even more preferably about 0.15. The coefficient of friction can be measured according to standard ASTM D1894.

[0058] In some embodiments, the third layer comprises a polymer (preferably a polyolefin plastomer) having a heat seal initiation temperature of about 170° C. or less in an amount of at least about 50% by weight of the third layer, such as at least about 60% by weight of the third layer, such as at least about 70% by weight of the third layer, such as at least about 80% by weight of the third layer, such as at least about 90% by weight of the third layer, such as at least about 99% by weight of the third layer. In some embodiments, the third layer may be comprised of a polymer (preferably a polyolefin plastomer) having a heat seal initiation temperature of about 170° C. or less.

[0059] In some embodiments, the third layer comprises a polymer (preferably a polyolefin plastomer) having a heat seal initiation temperature of about 170° C. or less in an amount of about 50% to about 99% by weight of the third layer, such as about 60% to about 95% by weight of the third layer, such as about 70% to about 90% by weight of the third layer, such as about 70% to about 80% by weight of the third layer. Preferably, the third layer comprises a polyolefin plastomer in an amount of about 60% to about 80% by weight of the third layer. Preferably, the third layer comprises a polyolefin plastomer in an amount of about 70% to about 80% by weight of the third layer.

[0060] In some preferred embodiments, the third layer comprises a polymer (preferably a polyolefin plastomer) having a heat seal initiation temperature of about 170° C. or less in an amount of about 70% to about 80% by weight of the third layer. In some embodiments, the third layer comprises a polyolefin plastomer in an amount of about 70% to about 80% by weight of the third layer.

[0061] In some embodiments, the third layer comprises a polymer having a heat seal initiation temperature of about 170° C. or less in an amount of about 15% to about 30% by weight of the total of components (i), (ii), and (iii). Preferably, the third layer comprises a polymer having a heat seal initiation temperature of about 170° C. or less in an amount of about 15% to about 25% by weight of the total of components (i), (ii), and (iii). In some embodiments, the third layer comprises a polyolefin plastomer in an amount of about 15% to about 30% by weight of the total of components (i), (ii), and (iii), preferably in an amount of about 15% to about 25% by weight of the total of components (i), (ii), and (iii). In some embodiments, the third layer comprises a copolymer of ethylene and octene in an amount of about 15% to about 30% by weight of the sum of components (i), (ii), and (iii), preferably in an amount of about 15% to about 25% by weight of the sum of components (i), (ii), and (iii).

[0062] Preferably, the polymer having the required heat seal initiation temperature can be combined with an additional polymer of the third layer. The additional polymer can be any suitable polymer that allows an acceptable seal to be formed by the third layer. For recyclability purposes, it may be preferred that the additional polymer is a type of polyethylene. It has also been found that the inclusion of polyethylene facilitates process flow. The additional polymer (such as PE) can preferably have a melt flow index of about 1.5 g / 10 min to about 3 g / 10 min when measured at 190° C. and 2.16 kg. Preferably, the polyethylene has a melt flow index of about 2 g / 10 min to about 2.5 g / 10 min when measured at 190° C. and 2.16 kg, more preferably about 2.5 g / 10 min when measured at 190° C. and 2.16 kg.

[0063] In some embodiments, the additional polymer may be any suitable type of polyethylene. In some embodiments, the additional polymer is selected from the group consisting of ultra-high molecular weight polyethylene (UHMWPE), ultra-low molecular weight polyethylene (ULMWPE), high molecular weight polyethylene (HMWPE), high density polyethylene (HDPE), high density cross-linked polyethylene (HDXLPE), cross-linked polyethylene (PEX), medium density polyethylene (MDPE), linear low density polyethylene (LLDPE), low density polyethylene (LDPE), very low density polyethylene (VLDPE), chlorinated polyethylene (CPE), and combinations thereof. Preferably, the additional polymer is selected from the group consisting of MDPE, LLDPE, LDPE, and combinations thereof. Preferably, the additional polymer is LDPE or the additional polymer includes LDPE. Preferably, the additional polymer is LDPE.

[0064] Thus, in some embodiments, the third layer comprises a polyolefin plastomer, optionally in combination with a low density polyethylene. In some embodiments, the third layer comprises a polyolefin plastomer, optionally in combination with a linear low density polyethylene.

[0065] In some embodiments, the additional polymer (such as LDPE) is present in an amount of about 1% to about 50% by weight of the third layer, such as, for example, about 5% to about 40% by weight of the third layer, such as, for example, about 10% to about 30% by weight of the third layer. It may be preferred that the additional polymer (such as LDPE) is present in an amount of about 20% to about 40% by weight of the third layer. It may be preferred that the additional polymer (such as LDPE) is present in an amount of about 20% to about 30% by weight of the third layer. Preferably, the third layer comprises LDPE in an amount of about 20% to about 30% by weight of the third layer.

[0066] In some embodiments, the third layer comprises a polyethylene (such as LDPE) in an amount of about 1% to about 15% by weight of the sum of components (i), (ii) and (iii). Preferably, the third layer comprises a polyethylene (such as LDPE) in an amount of 2.5% to 10% by weight, more preferably 4% to 10% by weight, of the sum of components (i), (ii) and (iii).

[0067] In some embodiments, the third layer comprises (a) a polyolefin plastomer in an amount of about 60% to about 95% by weight of the third layer, and (b) a low density polyethylene in an amount of about 5% to about 40% by weight of the third layer. In some embodiments, the third layer comprises (a) a polyolefin plastomer in an amount of about 70% to about 85% by weight of the third layer, and (b) a low density polyethylene in an amount of about 15% to about 30% by weight of the third layer. In some embodiments, the third layer comprises (a) a polyolefin plastomer in an amount of about 70% to about 80% by weight of the third layer, and (b) a low density polyethylene in an amount of about 20% to about 30% by weight of the third layer.

[0068] In some embodiments, the weight ratio of the polymer having a heat seal initiation temperature of about 170° C. or less (preferably a polyolefin plastomer such as an ethylene and octene copolymer) to the additional polymer (preferably LDPE) is from about 99:1 to about 50:50, preferably from about 90:10 to about 60:40, and more preferably from about 80:20 to about 70:30.

[0069] In some embodiments, the construct comprises a third layer in an amount of about 5% to about 80% by weight based on the combined weight of layers (i), (ii), and (iii), such as an amount of about 10% to about 50% by weight based on the combined weight of layers (i), (ii), and (iii). In some embodiments, the construct comprises a third layer in an amount of about 5% to about 65% by weight based on the combined weight of layers (i), (ii), and (iii), preferably about 15% to about 35% by weight, more preferably about 20% to about 30% by weight of the combined weight of components (i), (ii), and (iii).

[0070] It has been found that the inclusion of a third layer comprising the above-mentioned polymer can provide a film construction that improves sealing properties and reduces leakage of contents from within the package formed by the film. If the amount of the third layer is small (e.g., less than 20%), the seal formed may not be as strong as if a larger amount of the third layer were provided. By providing a third "sealing" layer with a polymer having a relatively low heat seal initiation temperature, the inventors have found that an excellent seal can be formed by heating the construction without adversely affecting the properties of the first layer and the properties of the second layer. Thus, the seal range and seal integrity can be improved.

[0071] The third layer can provide the construct with high seal strength. The seal strength may be greater than about 1 N / 15 mm, preferably greater than about 5 N / 15 mm. In some embodiments, the seal strength of the construct may be from about 1 N / 15 mm to about 40 N / 15 mm, preferably from about 5 N / 15 mm to about 30 N / 15 mm, preferably from about 5 N / 15 mm to about 20 N / 15 mm, more preferably from about 10 N / 15 mm to about 15 N / 15 mm. In some embodiments, the seal strength may be from about 10 N / 15 mm to about 14 N / 15 mm.

[0072] In some embodiments, the third layer may further comprise an additive or auxiliary. For example, the third layer may comprise an anti-blocking agent or a slip agent. In some embodiments, the third layer further comprises an anti-blocking agent.

[0073] In some embodiments, the third layer comprises (a) a polyolefin plastomer in an amount of about 70% to about 85% by weight of the third layer, (b) a low density polyethylene in an amount of about 15% to about 30% by weight of the third layer, and (c) an antiblocking agent in an amount of about 0% to about 5% by weight of the third layer. In some embodiments, the third layer comprises (a) a polyolefin plastomer in an amount of about 70% to about 80% by weight of the third layer, (b) a low density polyethylene in an amount of about 15% to about 25% by weight of the third layer, and (c) an antiblocking agent in an amount of about 1% to about 3% by weight of the third layer.

[0074] In some embodiments, the third layer may further comprise an additive or auxiliary. For example, the third layer may comprise an antiblocking agent or slip agent. In some embodiments, the third layer further comprises an antiblocking agent. The slip agent or antiblocking agent may be any suitable additive known in the art. For example, Slipblock from additive supplier Amphacet may be used in the third layer to maintain the coefficient of friction of the PE film.

[0075] Arrangement of the first layer, the second layer and the third layer As described herein, the second layer is disposed between the first layer and the third layer. Figure 1 illustrates an embodiment of a multilayer film construction 100. As shown in Figure 1, the first layer 110 is in contact with the second layer 120, which in turn is in contact with the third layer 130. In some embodiments, the second layer may be considered to be a core layer sandwiched between the first layer and the third layer.

[0076] As shown in Fig. 1, the third layer 130 has a first surface 131 in contact with the second layer 120 and a second surface 132 that can serve as the outer surface of the multi-layer film construction. The third layer can preferably be called a "sealant" layer, which can form a seal and reduce the permeability of materials throughout the film construction. When the film construction serves as a package for containing liquid or solid materials, the third layer can reduce leakage of said materials by its sealing effect.

[0077] The first layer 110 may also have a first surface 111 and a second surface 112, and the second surface 112 may be in contact with the second layer 120, and the first surface 111 may not be in contact with the second layer 120 (or the third layer 130).

[0078] The multi-layer construction may comprise layers in the following relative amounts: (i) a first layer in an amount of about 5% by weight to about 60% by weight, based on the combined weight of layer (i), layer (ii), and layer (iii); (ii) a second layer in an amount of about 30% to about 90% by weight, based on the combined weight of layers (i), (ii), and (iii); and (iii) a third layer in an amount of about 5% to about 65% by weight, based on the combined weight of layers (i), (ii), and (iii).

[0079] The multi-layer construction may comprise layers in the following relative amounts: (iv) a first layer in an amount of about 5% by weight to about 20% by weight, based on the combined weight of layers (i), (ii), and (iii); (v) a second layer in an amount of about 60% to about 80% by weight, based on the combined weight of layers (i), (ii), and (iii); and (vi) a third layer in an amount of about 15% to about 35% by weight, based on the combined weight of layers (i), (ii), and (iii).

[0080] In some embodiments, the multi-layer construction comprises layers in the following relative amounts: (i) a first layer in an amount of about 5% by weight to about 15% by weight, based on the combined weight of layer (i), layer (ii), and layer (iii); (ii) a second layer in an amount of about 65% to about 75% by weight, based on the combined weight of layers (i), (ii), and (iii); and (iii) a third layer in an amount of about 20% to about 30% by weight, based on the combined weight of layers (i), (ii), and (iii).

[0081] In some embodiments, the first layer and second layer are present in a weight ratio of about 1:20 to about 1:2, such as about 1:15 to about 1:5, such as about 1:10 to about 1:5.

[0082] In some embodiments, the first layer and third layer are present in a weight ratio of about 1:1 to about 1:10, such as, for example, about 1:1.5 to about 1:7.5, such as, for example, about 1:2 to about 1:5.

[0083] In some embodiments, the second layer and the third layer are present in a weight ratio of about 2:1 to about 1:10, such as about 1:1 to about 1:5, such as about 1:2 to about 1:4.

[0084] In some embodiments, the multilayer construct has a thickness of about 1 μm to about 100 μm. In some embodiments, the multilayer construct has a thickness of about 10 μm to about 90 μm. The thickness of the multilayer construct may vary depending on the intended use of the construct. When the construct is used in disposable (single-use) packaging (i.e., packaging that contains a single dose of product and is therefore opened only once and then discarded after a single use), the thickness of the construct may be about 15 μm to about 50 μm, preferably about 20 μm to about 40 μm. When the construct is used in multiple-use packaging (i.e., packaging that contains multiple doses of product and therefore may be resealed in some way after the dose is removed from the packaging), the thickness of the construct may be about 20 μm to about 90 μm, preferably about 35 μm to about 80 μm.

[0085] The relative thicknesses of the first, second and third layers in the construct can be, for example, from about 1:2:1 to about 1:20:2, such as from about 1:5:1 to about 1:10:2.

[0086] Preferably, the multilayer film construction comprises layers in the following relative amounts: (i) a first layer comprising a cyclic olefin copolymer, the first layer being present in an amount of about 5% to about 15% by weight, based on the combined weight of layers (i), (ii), and (iii); (ii) a second layer comprising LLDPE, MDPE, or a combination thereof, present in an amount of about 65% to about 75% by weight, based on the combined weight of layers (i), (ii), and (iii); and (iii) a third layer comprising 70-80 wt. % of a polyolefin plastomer, based on the weight of the third layer, and 20-30 wt. % of a polyethylene (preferably LDPE), based on the weight of the third layer, present in an amount of about 20 wt. % to about 30 wt. %, based on the combined weight of layers (i), (ii), and (iii).

[0087] Preferably, the multilayer film construction comprises layers in the following relative amounts: (i) a first layer comprising a cyclic olefin copolymer, the first layer being present in an amount of about 5% to about 8% by weight, based on the combined weight of layers (i), (ii), and (iii); (ii) a second layer comprising LLDPE, MDPE, or a combination thereof, present in an amount of about 67% to about 70% by weight, based on the combined weight of layers (i), (ii), and (iii); and (iii) a third layer comprising 70-80 wt. % of a polyolefin plastomer, based on the weight of the third layer, and 20-30 wt. % of a polyethylene (preferably LDPE), based on the weight of the third layer, present in an amount of about 25 wt. % based on the combined weight of layers (i), (ii) and (iii).

[0088] Such multilayer film constructions may also further comprise a metal layer in contact with the first layer and, optionally, a printable outer layer comprising OPP.

[0089] Further ingredients In some embodiments, the multilayer film construction consists of the first layer, second layer, and third layer described above.

[0090] Alternatively, the multilayer construction may further comprise additional layers and / or additional components. In some embodiments, the multilayer construction further comprises a metal layer. The metal layer may preferably be provided in contact with the first layer such that the first layer is disposed between the metal layer and the second layer. This arrangement is shown in FIG. 2, where the first layer 210 of the multilayer construction 200 has a first surface 211 and a second surface 212, the first surface 211 being in contact with the metal layer 240. The multilayer construction 200 also comprises a second layer 220 and a third layer 230 in the same configuration as shown in FIG. 1. A multilayer construction comprising a metal layer may be referred to herein as a "metallized film construction."

[0091] In some embodiments, the metal layer may be made of any suitable metal known in the art to provide acceptable barrier properties. In some embodiments, the metal layer is made of aluminum or includes aluminum. Preferably, the metal layer is made of aluminum.

[0092] The inclusion of a metal layer such that the film construction is a metallized film construction may further improve the barrier properties of the construction. Surprisingly, the inventors have also found that the adhesion of polyethylene to the metal layer can be improved by providing a first layer between the second layer and the metal layer. Metallized polyethylene films previously had poor adhesion properties between the PE layer and the metal, but the present invention improves adhesion and allows for a more uniform bond strength. The uniform bond strength allows for tuning or optimizing the coefficient of friction of the film construction and optimizing the amount of metal layer deposition, thus further improving the barrier properties. In some embodiments, the metallized polyethylene film may have a water vapor transmission rate and / or oxygen transmission rate as described above. Each of the ranges described above for WVTR and / or OTR apply equally to the metallized polyethylene film. For example, the metallized multilayer film construction preferably has a water vapor transmission rate of about 3 cc / m per day. 2 For example, the metallized multilayer film construction preferably has an OTR of about 0.1 g / m per day. 2 It may have the following WVTR: OTR can be measured at 23° C. and 50% RH using ASTM F1927, or at 23° C. and 0% RH using ASTM D3985, and WVTR can be measured at 38° C. and 90% RH using ASTM F1249.

[0093] In some embodiments in which the construct comprises a metal layer, the coefficient of friction between the first layer and the metal layer is from about 0.01 to about 1, preferably from about 0.1 to about 0.5, more preferably from about 0.15 to about 0.4, and even more preferably from about 0.2 to about 0.3. The coefficient of friction between the first layer and the metal layer may preferably be from about 0.1 to about 0.25.

[0094] The multi-layer construction may further comprise a printable exterior layer. The printable layer is made of any suitable material that can have an image or text printed thereon and that is visible to a user of the multi-layer film construction. For example, if the construction is intended for use in packaging, the printable layer may include a design and / or text printed thereon that is visible to a user and provides the user with information regarding the contents within the package. The printable exterior layer may be provided with or without the metal layer described above. In some embodiments, the multi-layer construction comprises both the metal layer described above and a printable exterior layer. Such an arrangement is shown in FIG. 2, where the printable exterior layer 250 is disposed adjacent to the metal layer 240. The printable exterior layer has at least one surface 251 that is not in contact with any other layer so that a user of the construction can see any design printed on the printable exterior layer.

[0095] In some embodiments, the printable outer layer comprises a polymer selected from oriented polypropylene (OPP), oriented polyethylene (OPE), and combinations thereof. In some embodiments, the printable outer layer comprises oriented polypropylene. In some embodiments, the printable outer layer comprises oriented polyethylene. The OPP and / or OPE can be any commercially available grade OPP and / or OPE having a printing grade for food packaging and the like. Preferably, the polymer is OPP. It has been found that when OPP is used as the printable outer layer, the barrier properties can be improved compared to other printable materials (e.g., polyethylene terephthalate, PET).

[0096] In some embodiments, the printable outer layer provided on the construction has a thickness of from about 15 μm to about 50 μm, such as from about 15 μm to about 45 μm.

[0097] In some embodiments, the printable outer layer comprises OPP and has a thickness of about 15 μm to about 50 μm, preferably about 30 μm. When the construct is used for single-use packaging, the printable outer layer comprising OPP may have a thickness of about 15 μm to about 40 μm, preferably about 20 μm to about 35 μm. When the construct is used for multi-use packaging, the printable outer layer comprising OPP may have a thickness of about 30 μm to about 50 μm.

[0098] In some embodiments, the printable outer layer comprises OPE and has a thickness of about 20 μm to about 45 μm, preferably about 25 μm. In some embodiments, the construct may be intended for use in single-use packaging, and the printable outer layer comprising OPE may have a thickness of about 20 μm to about 40 μm, preferably about 20 μm to about 30 μm. In some embodiments, the construct may be intended for use in multi-use packaging, and the printable outer layer comprising OPE may have a thickness of about 30 μm to about 50 μm.

[0099] In some embodiments, the printable outer layer may be present in the construction such that the ratio of the thickness of the printable outer layer to the combined thickness of layers (i), (ii) and (iii) is in the range of 10:1 to 1:10. Preferably, the ratio of the thickness of the printable outer layer to the combined thickness of layers (i), (ii) and (iii) is from about 2:1 to about 1:5, such as from about 1:1 to about 1:3, such as from about 1:1 to about 1:2.

[0100] In addition to providing a suitable printing surface, the printable outer layer can improve the stiffness of the construct, improving the machinability of the construct.

[0101] In some embodiments, films with a printable outer layer (with or without a metal layer) can have the water vapor transmission rate and / or oxygen transmission rate described above. Each of the ranges described above for WVTR and / or OTR apply equally to films with a printable outer layer. For example, metallized multilayer film constructions preferably have a water vapor transmission rate of about 3 cc / m per day. 2For example, the metallized multilayer film construction preferably has an OTR of about 0.1 g / m per day. 2 It may have the following WVTR: OTR may be measured at 23° C. and 50% RH using ASTM F1927, and WVTR may be measured at 38° C. and 90% RH using ASTM F1249.

[0102] When both a metal layer and an outer printable layer are present, the coefficient of friction between the metal layer and the outer printable layer may be from about 0.1 to about 0.5, preferably from about 0.2 to about 0.4.

[0103] In some embodiments, the multilayer film construction comprises: (i) a first layer comprising a cyclic olefin copolymer; (ii) a second layer comprising polyethylene; and (iii) a third layer comprising a polymer having a heat seal initiation temperature of about 170° C. or less; And, the second layer is disposed between the first layer and the third layer, the first layer, the second layer and the third layer; (iv) a metal layer; and (v) a printable outer layer; Equipped with.

[0104] In such embodiments, the metal layer may preferably be disposed between the first layer and the printable outer layer.

[0105] The entire construct The multilayer film construction described herein is preferably a cast film. Since at least the second layer comprises polyethylene, the film construction may be called a cast polyethylene film (CPE). If the film construction comprises a metal layer, the film construction may be a metallized cast polyethylene film (MCPE).

[0106] In some embodiments, the multilayer film construction can have a flow rate of, for example, about 3 cc / m per day. 2 Approximately 5cc / m per day, such as 2 Preferably, the multilayer film construction has an oxygen transmission rate (OTR) of about 3 cc / m per day. 2 The OTR is, for example, about 0.75 cc / m per day. 2 Less than 0.5cc / m per day, for example 2 Approximately 1cc / m per day, such as 2 In some preferred embodiments, the multilayer film construction has a saturation rate of about 0.2 cc / m per day or less. 2 In some preferred embodiments, the multilayer film construction has an oxygen transmission rate (OTR) of about 0.1 cc / m per day. 2 The multilayer film structure has an oxygen transmission rate (OTR) of, for example, about 0.1 to about 3 cc / m per day. 2 Approximately 0.01 to 5cc / m per day 2 The film may have an oxygen transmission rate of 100-200%. Oxygen transmission rate is a measure of the rate at which oxygen gas can pass through the film under steady state conditions. Oxygen transmission rate can be measured at 23° C. and 0% or 50% RH using ASTM D3985 or ASTM F1927, respectively.

[0107] In some embodiments, the multilayer film construction has a saturation rate of about 1 g / m per day. 2 In a preferred embodiment, the multilayer film construction has a water vapor transmission rate of about 0.5 g / m per day. 2 In some preferred embodiments, the multilayer film construction has a water vapor transmission rate of about 0.2 g / m per day. 2 Preferably, the multilayer film construction has a water vapor transmission rate of about 0.1 g / m per day. 2 More preferably, the multilayer film construction has a water vapor transmission rate of about 0.05 g / m per day. 2 The multilayer film structure has a water vapor transmission rate of, for example, about 0.001 to about 0.05 g / m per day.2 For example, about 0.01 to about 0.075 g / m per day 2 Approximately 0.0001 to 0.1 g / m per day 2 Similar to OTR, water vapor transmission rate (WVTR) is a measure of the rate at which water vapor can permeate a film under steady state conditions. WVTR can be measured using ASTM F1249 at 38° C. and 90% RH.

[0108] In a preferred embodiment, the multilayer film construction has a yield of about 0.1 g / m per day. 2 It has the following water vapor transmission rate:

[0109] Both oxygen gas and water vapor are gases known to affect the microbial stability of food and beverage products, such as coffee, tea, chocolate, cheese, meat, and nuts. The inventors have found that the combination of the first layer of COC with the second and third layers of the construct provides a film with excellent barrier properties against both oxygen and water vapor. This means that the shelf life of materials stored in the packaging formed by the film can be improved, since the rate at which oxygen gas and / or water vapor can permeate the film is low.

[0110] As mentioned above, it has also been found that the construction can have a low tear strength that allows the construction to be torn linearly by hand without snagging. In some embodiments, the tear strength of the multi-layer construction can be about 4N or less, such as about 3N or less, preferably about 2N or less.

[0111] The construction has also been found to provide an advantageous coefficient of friction between the outer surface of the third layer (or sealant layer) and processing machinery. It has previously been found that metallized PE films have very high friction and therefore may not meet the requirements of filling machines. However, the present invention has been found to alleviate these problems.

[0112] In addition, the construction has been found to provide a wider seal area with verified seal integrity to ensure hermeticity of the package with good seal appearance.

[0113] In some embodiments, the multilayer film construction comprises: (i) a first layer comprising a cyclic olefin copolymer; (ii) a second layer comprising polyethylene; and (iii) a third layer comprising a polymer having a heat seal initiation temperature of about 170° C. or less; Equipped with the second layer is disposed between the first layer and the third layer; The multilayer film construction described above has a yield of about 3 g / m per day. 2 The multilayer film construction described above has an oxygen transmission rate of about 0.5 g / m per day. 2 It has the following water vapor transmission rate:

[0114] In some embodiments, the multilayer film construction comprises: (i) a first layer comprising a cyclic olefin copolymer; (ii) a second layer comprising polyethylene; and (iii) a third layer comprising a polymer having a heat seal initiation temperature of about 170° C. or less; Equipped with the second layer is disposed between the first layer and the third layer; The multilayer film construction described above has a yield of about 3 g / m per day. 2 The multilayer film construction described above has an oxygen transmission rate of about 0.1 g / m per day. 2 It has the following water vapor transmission rate:

[0115] In some embodiments, the multilayer film construction comprises: (i) a first layer comprising a cyclic olefin copolymer; (ii) a second layer comprising polyethylene; and (iii) a third layer comprising a polymer having a heat seal initiation temperature of about 170° C. or less; Equipped with the second layer is disposed between the first layer and the third layer; The multilayer film construction described above has a yield of about 0.5 g / m per day. 2 It has the following oxygen permeability:

[0116] In some embodiments, the multilayer film construction comprises: (i) a first layer comprising a cyclic olefin copolymer; (ii) a second layer comprising polyethylene; and (iii) a third layer comprising a polymer having a heat seal initiation temperature of about 170° C. or less; And, the second layer is disposed between the first layer and the third layer, the first layer, the second layer and the third layer; (iv) a metal layer; and (v) a printable outer layer, preferably comprising oriented polypropylene, oriented polyethylene, or a combination thereof; Equipped with The multilayer film construction described above has a yield of about 3 g / m per day. 2 The multilayer film construction described above has an oxygen transmission rate of about 0.1 g / m per day. 2 It has a water vapor transmission rate of: The metal layer may preferably be disposed between the first layer and the printable outer layer.

[0117] In some preferred embodiments, the multilayer film construction comprises: (i) a first layer comprising a cyclic olefin copolymer; (ii) a second layer comprising polyethylene; and (iii) a third layer comprising a polymer having a heat seal initiation temperature of about 150° C. or less; And, the second layer is disposed between the first layer and the third layer, the first layer, the second layer and the third layer; (iv) a metal layer; and (v) a printable outer layer, preferably comprising oriented polypropylene, oriented polyethylene, or a combination thereof; Equipped with.

[0118] In some preferred embodiments, the multilayer film construction comprises: (i) a first layer comprising a cyclic olefin copolymer, the first layer being present in an amount of about 5% to about 15% by weight, based on the combined weight of layers (i), (ii), and (iii); (ii) a second layer comprising LLDPE, MDPE, or a combination thereof, present in an amount of about 65% to about 75% by weight, based on the combined weight of layers (i), (ii), and (iii); and (iii) a third layer comprising 70-80 wt. % of a polyolefin plastomer, based on the weight of the third layer, and 20-30 wt. % of a polyethylene (preferably LDPE), based on the weight of the third layer, present in an amount of about 20 wt. % to about 30 wt. %, based on the combined weight of layers (i), (ii), and (iii); And, the second layer is disposed between the first layer and the third layer, the first layer, the second layer and the third layer; (iv) a metal layer; and (v) a printable outer layer, preferably comprising oriented polypropylene, oriented polyethylene, or a combination thereof; Equipped with.

[0119] Laminate The present specification provides a laminate comprising: (a) a first barrier layer comprising the metallized multilayer film construction described above; (b) a second barrier layer comprising a metallized oriented polypropylene; and (c) a printable outer layer comprising a polymer selected from oriented polypropylene, oriented polyethylene, and combinations thereof; A laminate comprising:

[0120] The first barrier layer may be a metallized multi-layer film construction having any of the above-mentioned features and / or characteristics. Thus, the first barrier layer may be a metallized cast polyethylene film (MCPE) comprising a first layer of COC, a second layer of PE, and a third layer of a polymer having a heat seal initiation temperature of about 170° C. or less. The first barrier layer may also function as a sealant layer.

[0121] In some embodiments, the first barrier layer is present in an amount of about 10% to about 90% by volume of the laminate. In some embodiments, the first barrier layer is present in an amount of about 15% to about 70% by volume of the laminate. In some preferred embodiments, the first barrier layer is present in an amount of about 20% to about 60% by volume of the laminate, preferably about 30% to about 50% by volume of the laminate. As used herein, "volume %" refers to the volume percentage per unit area of ​​the laminate.

[0122] In some embodiments (e.g., where the package is used as a single-serve package), the first barrier layer is present in an amount of about 15% to about 40% by volume of the laminate, preferably about 15% to about 30% by volume of the laminate. In some embodiments (e.g., where the package is used as a multi-serve package), the first barrier layer is present in an amount of about 20% to about 70% by volume of the laminate, preferably about 25% to about 50% by volume of the laminate.

[0123] In some embodiments, the second barrier layer is present in an amount of about 1% to about 40% by volume of the laminate. In some embodiments, the second barrier layer is present in an amount of about 5% to about 30% by volume of the laminate, preferably about 10% to about 25% by volume of the laminate (e.g., the package may be used as a single-serve package). In some embodiments, the second barrier layer is present in an amount of about 10% to about 40% by volume of the laminate, preferably about 15% to about 35% by volume of the laminate (e.g., the package may be used as a multi-serve package). In some embodiments, the second barrier layer is present in an amount of about 1% to about 30% by volume of the laminate, preferably about 5% to about 25% by volume of the laminate.

[0124] For multi-layer film constructions, a printable outer layer in the laminate may be present to provide a printing substrate for packaging made from the laminate. The printable outer layer may also improve the stiffness and machinability of the laminate. The printable outer layer comprises a polymer selected from oriented polypropylene, oriented polyethylene, and combinations thereof. Preferably, the printable outer layer comprises OPP.

[0125] In some embodiments, the printable outer layer is present in an amount of about 1% to about 80% by volume of the laminate. In some embodiments, the printable outer layer is present in an amount of about 5% to about 60% by volume of the laminate. In some preferred embodiments, the printable outer layer is present in an amount of about 10% to about 50% by volume of the laminate, preferably about 15% to about 30% by volume of the laminate. In some embodiments (e.g., where the packaging may be used as a single-serve packaging), the printable outer layer is present in an amount of about 5% to about 80% by volume of the laminate, preferably about 10% to about 60% by volume of the laminate. In some embodiments (e.g., where the packaging may be used as a multi-serve packaging), the printable outer layer is present in an amount of about 1% to about 60% by volume of the laminate, preferably about 5% to about 40% by volume of the laminate, more preferably about 10% to about 30% by volume of the laminate.

[0126] In some embodiments, the laminate comprises: (a) a first barrier layer comprising the metallized multilayer film construction described above, the first barrier layer being present in an amount of about 30% to about 50% by volume of the laminate; (b) a second barrier layer comprising a metallized oriented polypropylene, the second barrier layer being present in an amount of about 10% to about 25% by volume of the laminate; and (c) a printable outer layer comprising a polymer selected from oriented polypropylene, oriented polyethylene, and combinations thereof, the printable outer layer being present in an amount of about 15% to about 30% by volume of the laminate; Equipped with.

[0127] The laminate may have a total thickness of about 40 μm to about 200 μm, preferably about 50 μm to about 150 μm, and more preferably about 60 μm to about 100 μm. In some preferred embodiments, the laminate has a total thickness of about 50 μm to about 200 μm.

[0128] The thickness of the first barrier material may be about 20 μm to about 80 μm, preferably about 20 μm to about 40 μm. The thickness of the second barrier material may be about 5 μm to about 25 μm, preferably about 15 μm to about 20 μm. In some preferred embodiments, the thickness of the first barrier layer is about 20 μm to about 80 μm, and the thickness of the second barrier layer is about 5 μm to about 20 μm. The thickness of the printable outer layer may be about 15 μm to about 45 μm, preferably about 15 μm to about 25 μm.

[0129] In some embodiments, the laminate comprises: (a) a first barrier layer having a thickness of about 35 μm; (b) a second barrier layer having a thickness of about 16 μm to about 18 μm; and (c) a printable outer layer having a thickness of about 18 μm to about 20 μm; Equipped with.

[0130] As shown in FIG. 3, the second barrier layer 320 of the laminate 300 is preferably disposed between the first barrier layer 310 and the printable outer layer 330 such that the first barrier layer 310 can function as a sealant layer.

[0131] The laminate may optionally comprise an additional layer comprising polyethylene. The additional layer may be located anywhere in the laminate, but is preferably located between the second barrier layer and the printable outer layer. This is shown in Figure 4, where the laminate 400 comprises a first barrier layer 410 adjacent to a second barrier layer 420, which is adjacent to an additional layer 440 comprising polyethylene, which is adjacent to a printable outer layer 430.

[0132] If an additional layer is provided, the polyethylene may be any suitable ethylene such as HDPE, MDPE, LLDPE, LDPE, and combinations thereof. The polyethylene may preferably be extruded polyethylene. The additional layer may function as a tie layer to bond the printable outer layer to the second barrier layer, and may also function as an intermediate layer to increase the space available for laser coding.

[0133] When an additional layer is provided, the additional layer may be present in an amount of about 1% to about 30% by volume of the laminate, such as about 5% to about 25% by volume of the laminate, in some preferred embodiments, the additional layer may be provided in an amount of about 10% to about 20% by volume of the laminate.

[0134] To improve adhesion of the printable outer layer to the polyethylene, an additional primer may be included between the printable outer layer and the additional layer comprising polyethylene. The primer may be any commercially available primer, such as a diluted adhesive.

[0135] In some embodiments, an adhesive layer may be provided between any of the aforementioned layers to improve adhesion between the layers. For example, an adhesive layer may be provided between the first barrier layer and the second barrier layer. Any suitable adhesive may be used. For example, the adhesive may be a solvent-free or solvent-based polyurethane, a polyether adhesive, or an acrylic adhesive.

[0136] The ink material can be used to print onto the laminate. The ink may be a multi-colour ink suitable for printing onto OPP or OPE films. Suitable inks will be apparent to those skilled in the art. The ink may be applied onto the laminate at a concentration of 0 g / m 2 ~ approx. 4g / m 2 may be applied in an amount of

[0137] The laminates may be useful for providing ultra-high barrier properties to packaging suitable for use in storing food products that are particularly sensitive to oxygen and moisture, such as freeze-dried coffee products or ground coffee beans. It has been found that the laminates can maintain the water activity (Aw) of the food product within the range of 0.01 to 0.5 for a period of up to 18 months, preferably for a period of 12 to 18 months. For example, the water activity of a food product (e.g., coffee) stored in the laminated packaging may be less than about 0.4, such as less than about 0.25, preferably in the range of about 0.1 to about 0.25, for a period of up to 18 months. The water activity of a food product (e.g., coffee) stored in the laminated packaging may be less than about 0.4, such as less than about 0.25, preferably in the range of about 0.1 to about 0.25, for a period of up to 12 months.

[0138] In particular, it has been found that the combination of two high barrier metallized polyolefin films can further improve the barrier properties. The laminate can be, for example, approximately 0.2 g / m2 per day. 2 Approximately 0.5 g / m per day, such as 2 In some preferred embodiments, the laminate may have a water vapor transmission rate (WVTR) of about 0.1 g / m per day. 2 Preferably, the laminate has a water vapor transmission rate of about 0.05 g / m per day. 2 or less, more preferably about 0.02 g / m per day 2 More preferably, the multilayer film construction has a water vapor transmission rate of about 0.01 g / m per day. 2 It has the following water vapor transmission rate:

[0139] In some embodiments, the laminate can be applied at, for example, about 0.2 g / m per day. 2 Approximately 0.5 g / m per day, such as 2 In some preferred embodiments, the laminate has an oxygen transmission rate (OTR) of about 0.1 g / m per day. 2 In some preferred embodiments, the laminate construction has an oxygen transmission rate (OTR) of about 0.05 g / m per day.2 It has the following oxygen transmission rate (OTR):

[0140] It has also been found that the laminate can provide high barrier properties while also maintaining excellent mechanical properties such as coefficient of friction, heat seal properties, bond strength, stiffness, and contaminant seal properties.

[0141] process In one aspect, there is provided a method of making the multilayer film construction described above, comprising the steps of: (a) providing a first layer, a second layer, and a third layer in separate containers; (b) melting the first layer, the second layer, and the third layer polymers in separate vessels; (c) combining the first layer, the second layer, and the third layer to form a multilayer film construction; A method is provided, comprising:

[0142] The first layer, the second layer and the third layer may be prepared as described above. The first layer comprises at least a cyclic olefin copolymer, the second layer comprises at least a polyethylene, and the third layer comprises a polymer having a heat seal initiation temperature of at least about 170° C. or less. Thus, the expression "preparing the first layer, the second layer and the third layer in separate containers" may be interpreted to mean that the materials or polymer resins constituting each of the first layer, the second layer and the third layer are prepared in the first container, the second container and the third container, respectively. For example, the first container is provided with at least a COC resin (i.e., the first layer component), the second container is provided with at least a polyethylene, optionally in combination with an antiblocking agent (i.e., the second layer component), and the third container is provided with a polymer having a heat seal initiation temperature of at least about 170° C. or less, optionally in combination with additional polymers and / or antiblocking agents (i.e., the third layer component).

[0143] In some embodiments, the multilayer film construction is a cast polyethylene film. In such embodiments, the equipment used in the above process may be a casting line. In such embodiments, the three layers (each comprising at least one polymer resin) may be provided in individual hoppers of a casting line, such as a coextrusion casting line. The resins of the three layers may be melted evenly in their individual hoppers at optimal temperature ranges in step (b). The three layers may then be combined by being forced by a screw from the individual hoppers into an extrusion die at a uniform temperature. In this manner, the three layers may be coextruded into a cast polyethylene film.

[0144] The polymers of the first layer, the second layer and the third layer may be melted in step (b) above, preferably in individual hoppers on a casting line, at a temperature of at least about 200°C, preferably at least about 230°C. The melt temperature may be from about 200°C to about 300°C. It may be preferred that the process is carried out in a coextrusion casting line, with the melt temperature set within the range of about 230°C to about 245°C, which can ensure smooth running and reduce the occurrence of film breakage from the extrusion die. If a temperature below 230°C is used, the film may be prone to tear or hole formation along its length.

[0145] In embodiments where the process is carried out on a casting line, such as a coextrusion casting line, it may be preferred that the casting line speed is at least 80% of the machine capacity to allow for improved material flow compatibility. Preferably, the casting line speed may be at least about 100 m / min.

[0146] In some embodiments, the multilayer film construction is cured after step (c) of the above process. Thus, in some embodiments, the process includes the steps of: (a) providing the first layer, the second layer, and the third layer in separate containers; (b) melting the first layer, the second layer, and the third layer polymers in separate vessels; (c) combining the first layer, the second layer, and the third layer to form a multilayer film construction; and (d) curing the multilayer film construction; Includes.

[0147] The multilayer film construction may be allowed to cure for at least about 2 days before further handling or processing.

[0148] In some embodiments, the multilayer film construction may be subsequently metallized. For example, if the film construction is a cast polyethylene film, the construction may be metallized to provide a metallized cast polyethylene film (MCPE). The metallization process may be carried out using a vacuum deposition machine known to those skilled in the art. The metal used in this process (such as aluminum) may first be evaporated into a gas, and then the gaseous metal may be deposited on the surface of the multilayer film construction. The resulting metallized film construction may then be actively or passively cooled.

[0149] Hereafter is a detailed description of one preferred method for making a metallized multilayer film construction, preferably a metallized cast polyethylene film, in which a cast polyethylene film is made as described above. First, the air in the chamber of a vacuum deposition machine is removed, thereby placing the chamber under vacuum. Then, the aluminum wire in the chamber is evaporated into a gas. The multilayer film construction (preferably a cast polyethylene film) is introduced into the machine, and gaseous aluminum is deposited on its surface. The produced metallized film is then cooled using a cooling roller, and the metallized film is wound on a winder. The vacuum level in the chamber is about 4×10 -3 mbar ~ approx. 4 × 10 -4 The optical density setting may be from about 2.5 to about 2.8.

[0150] The optical density of the resulting metallized film may be from about 2.5 to about 2.8 using UV light, and the metal adhesion to the film may be at least about 500 g / inch.

[0151] The resulting metallized film construction may be allowed to cure for at least about one day before further handling or processing.

[0152] As mentioned above, the multilayer construction may further comprise a printable outer layer such as OPP or OPE. If a printable outer layer is provided, such layer may be applied by a lamination process. For example, a solvent-based or solventless laminator may be used here. The multilayer film construction (preferably CPE, more preferably MCPE) may first be coated with an adhesive and then laminated with OPP and / or OPE on a roller. The resulting film with OPP and / or OPE laminated thereon may be left to cure for at least one day. The adhesive used in the lamination process may be a solventless or solvent-based polyurethane, a polyether adhesive or an acrylic adhesive. The line speed used for lamination may be about 150 to about 250 m / min.

[0153] If a solvent-based laminator is used, the process may further include a drying step after adding the adhesive and prior to lamination. The drying step may be carried out at a temperature of about 70 to about 90° C. Zone drying may be carried out in zone 1 using a temperature of 70 to 80° C., zone 2 is 80 to 90° C. and zone 3 is 80 to 90° C.

[0154] The tear strength of such OPP and / or OPE laminated metallized cast polyethylene films may be about 2 N or less. The coefficient of friction between the first layer and the metal layer may be about 0.1 to about 0.25, and the coefficient of friction between the metal layer and the printable outer layer may be about 0.2 to about 0.4.

[0155] Process for making the laminate The laminates described herein can be made using a process similar to that described above for the multilayer film construction. Preferably, the first barrier layer comprising the metallized multilayer film construction and the second barrier layer comprising the metallized oriented polypropylene are prepared in separate containers and then combined. The step of combining the first and second barrier layers may be by extrusion as described above.

[0156] A printable outer layer comprising a polymer selected from oriented polypropylene, oriented polyethylene, and combinations thereof may then be applied as described above for applying such a printable outer layer to a multilayer film construction.

[0157] use The multilayer film constructions described herein may be suitable for use in making packaging for food or beverage products. The packaging may be suitable for use as a single-serve or multi-serve package. In some embodiments, the packaging may be for use as a single-serve package for coffee products (e.g., dried coffee granules, ground coffee beans, filter coffee granules, etc.). Such single-serve packages may be in the form of sachets that can be torn by hand by the user without the need for additional equipment (e.g., scissors).

[0158] The laminates described herein may also be suitable for use in making packaging for food or beverage products. The packaging may be suitable for use as a single-serve or multi-serve package. In some embodiments, the packaging may be for use as a single-serve package for coffee products (e.g., dry coffee granules, ground coffee beans, filter coffee granules, etc.). Such single-serve packaging may be in the form of a sachet that can be torn by hand by the user without the need for additional equipment (e.g., scissors).

[0159] As described herein, there is provided the use of a cyclic olefin copolymer in a multilayer film construction comprising polyethylene to improve the adhesion of the film construction to a metal layer. As mentioned above, it has been found that the inclusion of a COC in a layer between the polyethylene and the metal layer in a metallized film construction provides improved adhesion and improved barrier properties compared to a metallized polyethylene film that does not contain a COC.

[0160] As described herein, 0.1 g / m per day 2 Also provided is the use of a cyclic olefin copolymer to provide a metallized film construction comprising the cyclic olefin copolymer, the metallized film construction having the following water vapor transmission rate:

[0161] In addition, 0.1 g / m per day 2 Also provided is the use of a cyclic olefin copolymer to provide a metallized film construction having the following oxygen permeability, the metallized film construction comprising the cyclic olefin copolymer: EXAMPLES

[0162] Example 1 Three metallized multilayer film constructions were prepared: Sample 1-A, Sample 1-B, and Sample 1-C.

[0163] A comparative sample 1-D was also prepared.

[0164] Samples 1-A to 1-D were made by a co-extrusion casting line. The first layer of COC and optionally LDPE was prepared in the first hopper. The second layer of LLDPE was fed into the second hopper, and the third layer of POP and LDPE was prepared in the third hopper. For Sample 1-D, only the second and third hoppers were used. Each of the resins in the individual hoppers was then melted at a temperature of 230-245°C and then forced into the extrusion die by the screw. The casting line speed was set to more than 100 m / min, and the three layers were co-extruded to form a cast polyethylene film. The film was then metallized to prepare MCPE. The cast polyethylene film was then heated in a vacuum (10-200°C) until the first chamber was heated to 300°C. 3 ~10- 4 The resulting MCPE film was then introduced into a vacuum metallizer at 1000 psi (2000 psi) and 1000 psi (1000 psi) at 1000 psi (2000 psi). In this first chamber, the aluminum wire was evaporated into a gas, which was then deposited on the surface of the CPE. A cooling roller was used to cool the film. The optical density setting was 2.5-2.8. The resulting MCPE film was then cured for 24 hours.

[0165] Each of these samples included oriented polypropylene (OPP) adhered to a metallized cast polyethylene film (MCPE). The OPP layer was 30 μm thick and the total thickness of the MCPE was 35 μm (i.e., the total thickness of the metal, first layer, second layer, and third layer). Each MCPE film had the following structure: [Table 1]

[0166] Samples 1-A through 1-D have the following MCPE formulations, with the weight percentage of each component provided based on the combined weight of the first, second and third layers: As described above, each of these MCPE films was metallized and bonded to the OPP layer using aluminum such that the OPP layer was 30 microns thick and the MCPE film was 35 microns thick.

[0167] [Table 2]

[0168] The following properties of each of these samples were measured and the results are shown in the table below. [Table 3]

[0169] The barrier properties of the samples with COC in the first layer were found to be significantly improved compared to the samples without COC. The tear strength was also found to be lower for the samples according to the invention, which allowed the user to tear the construct by hand more easily in a straight line.

[0170] Example 2 Sample 2-1: This cast metallized polymer film was prepared according to the method of Example 1, having the components shown in the table below.

[0171] Comparative sample 2-2, Comparative sample 2-3 and Comparative sample 2-4 are commercially available films. Sample 2-3 may be, for example, PT Indopoly's SMMU MOPP18 or Jindal MM483 MOPP16. Sample 2-4 may be, for example, Amcor MCPP25-40u or Daibochi MCPP25-40u.

[0172] [Table 4]

[0173] Each of the samples was analyzed for physical and chemical properties and the results are shown in the following table. [Table 5]

[0174] The present disclosure also relates to embodiments disclosed in the following numbered paragraphs: 1. A multilayer film construction comprising: (i) a first layer comprising a cyclic olefin copolymer; (ii) a second layer comprising polyethylene; and (iii) a third layer comprising a polymer having a heat seal initiation temperature of about 150° C. or less; Equipped with the second layer is disposed between the first layer and the third layer; Multilayer film construction. 2. A multilayer film construction comprising: (i) a first layer comprising a cyclic olefin copolymer; (ii) a second layer comprising polyethylene; and (iii) a third layer comprising a polymer having a heat seal initiation temperature of about 150° C. or less; Equipped with a second layer disposed between the first layer and the third layer; The multilayer film construction is approximately 0.5 g / m per day. 2 The water vapor transmission rate is as follows: Multilayer film construction. 3. The multilayer film construction of paragraphs 1 or 2, wherein the first layer is present in an amount of about 5% by weight to about 15% by weight, based on the combined weight of layers (i), (ii) and (iii). 4. The multilayer film construction of any one of paragraphs 1 to 3, wherein the cyclic olefin copolymer of the first layer has a glass transition temperature of about 50°C to about 100°C. 5. The multilayer film construction of any one of paragraphs 1-4, wherein the first layer comprises a cyclic olefin copolymer in an amount of about 100 weight percent based on the total weight of the first layer. 6. The multilayer film construction of any one of paragraphs 1 to 5, wherein the second layer is present in an amount of about 65% by weight to about 75% by weight, based on the combined weight of layer (i), layer (ii), and layer (iii). 7. The multilayer film construction of any one of paragraphs 1-6, wherein the second layer comprises a polyethylene polymer selected from the group consisting of linear low density polyethylene, low density polyethylene, medium density polyethylene, and combinations thereof. 8. The multilayer film construction of any one of paragraphs 1 to 7, wherein the second layer comprises a polyethylene having a melt flow index, measured at 190° C. / 2.16 kg, of about 1.5 g / 10 min to about 2.5 g / 10 min. 9. The multilayer film construction of any one of paragraphs 1 to 8, wherein the third layer is present in an amount of about 20% by weight to about 30% by weight, based on the combined weight of layers (i), (ii), and (iii). 10. The multilayer film construction of any one of paragraphs 1-9, wherein the third layer comprises a polyolefin plastomer, optionally in combination with a low density polyethylene. 11. The multilayer film construction of any one of paragraphs 1 to 10, wherein the third layer comprises a polyolefin plastomer having a heat seal initiation temperature of about 80° C. to about 100° C. 12. The multilayer film construction of any one of paragraphs 1-11, wherein the third layer comprises (a) a polyolefin plastomer in an amount of about 70% to 80% by weight of the third layer, and (b) a low density polyethylene in an amount of about 20% to about 30% by weight of the third layer. 13. The multilayer film construction of any one of paragraphs 1-12, wherein the first layer has a first surface and a second surface, the second surface being in contact with the second layer, and the first surface not in contact with the second layer. 14. The multilayer film construction of paragraph 13, further comprising a metal layer in contact with the first surface of the first layer. 15. The multilayer film construction of paragraph 14, wherein the metal layer comprises aluminum or consists of aluminum. 16. The film structure is about 0.1 g / m 2 16. The multilayer film construction of paragraph 14 or 15, having an oxygen transmission rate of: 17. Approximately 0.1 g / m per day 2 2. The multilayer film construction of paragraph 1, having a water vapor transmission rate of: 18. The multilayer film construction of any one of paragraphs 1-17, further comprising a printable outer layer, the printable outer layer comprising a polymer selected from oriented polypropylene, oriented polyethylene, and combinations thereof. 19. A method for producing a multilayer film construction according to any one of paragraphs 1 to 18, comprising: (a) providing a first layer, a second layer, and a third layer in separate containers; (b) melting the polymers of the first layer, the second layer, and the third layer in separate containers; and (c) combining the first layer, the second layer, and the third layer to form a multilayer film construction; A method comprising: 20. A laminate comprising: (a) a first barrier layer comprising the metallized multilayer film construction of any one of paragraphs 14-16; (b) a second barrier layer comprising a metallized oriented polypropylene; and (c) a printable outer layer comprising a polymer selected from oriented polypropylene, oriented polyethylene, and combinations thereof; A laminate comprising: 21. The laminate of paragraph 20, further comprising an intermediate layer between the printable outer layer and the second barrier layer, the intermediate layer comprising polyethylene. 22. The laminate of paragraph 20 or 21, wherein the total thickness of the laminate is from about 50 μm to about 200 μm. 23. The laminate of any one of paragraphs 20 to 22, wherein the first barrier layer has a thickness of about 20 μm to about 80 μm and / or the second barrier layer has a thickness of about 5 μm to about 20 μm. 24. The use of a cyclic olefin copolymer in a multi-layer film construction containing polyethylene to improve the adhesion of the film construction to a metal layer. 25.0 g / m per day 2 1. Use of a cyclic olefin copolymer to provide a metallized film construction comprising the cyclic olefin copolymer, the metallized film construction having a water vapor transmission rate of:

[0175] Various modifications and alterations of the methods described in this invention will be apparent to those of skill in the art without departing from the scope and spirit of the invention. Although the invention has been described in connection with specific preferred embodiments, it should be understood that the invention as claimed is not to be unduly limited to such specific embodiments. Indeed, various modifications of the described modes for carrying out the invention which are obvious to those skilled in the art of chemistry, biology, or related fields are intended to be within the scope of the following claims.

Claims

Claim 1 A multilayer film structure comprising: (i) a first layer containing a cyclic olefin copolymer; (ii) a second layer containing polyethylene; and (iii) a third layer containing a polymer having a heat seal start temperature of about 170°C or lower; wherein the second layer is disposed between the first layer and the third layer. Multilayer film structure. Claim 2 A multilayer film structure comprising: (i) a first layer containing a cyclic olefin copolymer; (ii) a second layer containing polyethylene; and (iii) a third layer containing a polymer having a heat seal start temperature of about 170°C or lower; wherein the second layer is disposed between the first layer and the third layer. The multilayer film structure has a water vapor transmission rate of about 0.5 g / m per day ２ as follows Multilayer film structure. Claim 3 The first layer is present in an amount of about 5% to about 15% by weight based on the total weight of layers (i), (ii), and (iii); and / or the second layer is present in an amount of about 65% to about 75% by weight based on the total weight of layers (i), (ii), and (iii); and / or the third layer is present in an amount of about 20% to about 30% by weight based on the total weight of layers (i), (ii), and (iii). The multilayer film structure according to claim 1 or 2. Claim 4 The cyclic olefin copolymer of the first layer has a glass transition temperature of about 50°C to about 100°C. The multilayer film structure according to claim 1 or 2. Claim 5 The cyclic olefin copolymer is a copolymer of norbornene and ethylene. The multilayer film structure according to claim 1 or 2. Claim 6 The second layer contains a polyethylene polymer selected from the group consisting of linear low density polyethylene, low density polyethylene, medium density polyethylene, and combinations thereof. The multilayer film structure according to claim 1 or 2. Claim 7 The third layer contains a polyolefin plastomer, optionally in combination with low density polyethylene. Preferably, the third layer contains (a) a polyolefin plastomer in an amount of about 70% to 80% by weight of the third layer and (b) low density polyethylene in an amount of about 20% to about 30% by weight of the third layer. The multilayer film structure according to claim 1 or 2. Claim 8 The third layer contains a polyolefin plastomer having a heat seal start temperature of about 80°C to about 110°C. The multilayer film structure according to claim 1 or 2. Claim 9 The first layer has a first surface and a second surface, the second surface is in contact with the second layer, the first surface is not in contact with the second layer, the multilayer film structure further comprises a metal layer in contact with the first surface of the first layer, The multilayer film structure according to claim 1 or 2.

10. The film structure has a water vapor permeability of about 0.1 g / m per day; and / or ２ has the following water vapor permeability; and / or Approximately 0.1 g / m per day ２ having the following oxygen permeability; and / or The multilayer film structure according to claim 9, wherein the coefficient of friction between the first layer and the metal layer is from about 0.2 to about 0.

3.

11. The multilayer film structure according to claim 1 or 2, further comprising a printable outer layer, the printable outer layer comprising a polymer selected from oriented polypropylene, oriented polyethylene, and combinations thereof.

12. A method of manufacturing the multilayer film structure according to claim 1 or 2, comprising: (a) providing the first layer, the second layer, and the third layer in separate containers; (b) melting the polymers of the first layer, the second layer, and the third layer in the separate containers; and (c) combining the first layer, the second layer, and the third layer to form a multilayer film structure. A method comprising the above steps.

13. A laminate comprising: (a) a first barrier layer comprising the metallized multilayer film structure according to claim 9; (b) a second barrier layer comprising metallized oriented polypropylene; and (c) a printable outer layer comprising a polymer selected from oriented polypropylene, oriented polyethylene, and combinations thereof. A laminate comprising the above components.

14. Use of a cyclic olefin copolymer to improve the adhesion of the film structure to a metal layer in a multilayer film structure containing polyethylene.

15. 0.1 g / m per day ２ Use of a cyclic olefin copolymer for providing a metallized film structure having the following water vapor permeability and comprising the cyclic olefin copolymer.

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