Recyclable high moisture barrier film

Abstract

Described herein are recyclable packaging films comprising an unoriented multilayer film comprising: a first layer comprising a polymer selected from the group consisting of a cycloolefin copolymer, an ethylene vinyl alcohol copolymer, or a polyamide; a second layer comprising a polyethylene having a density in the range of from 0.89 g / cm3 to 0.94 g / cm3; and a third layer comprising a high density polyethylene. The unoriented multilayer film has a first surface comprising the first layer, a vapor deposition layer on the first surface. The total composition of the recoverable packaging film includes greater than 90% by weight of a polyethylene-based polymer. Also described herein are packages incorporating the recoverable packaging films.

Description

Technical Field

[0001] The present disclosure relates to packaging and recyclable film structures including vapor deposited barrier layers that exhibit a high moisture barrier. Background Art

[0002] In the field of flexible packaging, lamination of metallized biaxially oriented polypropylene (BOPP) film is one of the standard low-cost, high moisture barrier solutions. However, the existing recycling systems in the United States and some other countries do not accept flexible films containing BOPP unless it can be proven that the film has minimal impact on the reprocessability of the entire packaging film.

[0003] Films containing high levels of polyethylene (i.e., >80% PE by weight) can also be designed to provide a good moisture barrier. High-density polyethylene (HDPE) materials can effectively reduce moisture vapor transmission rate (MVTR). However, to achieve an MVTR suitable for products that are sensitive to moisture (or moisture loss), the amount of HDPE required can be significant, and the film becomes bulky (i.e., thick) and difficult to process on most packaging equipment. The moisture barrier properties of polyethylene films can also be improved by adding barrier coatings such as thin metal layers. However, the industry has not yet achieved a polyethylene-based packaging film that has a combination of runnability and high moisture barrier compared to metallized BOPP films. Recyclable packaging films with high moisture barrier properties are needed. Summary of the invention

[0004] There remains a need for recyclable film structures having high polyethylene content and excellent moisture barrier properties. The recyclable film structures disclosed herein unexpectedly achieve these properties. These recyclable films can be used in packaging applications where the product needs to be protected from exposure to moisture (i.e., limiting moisture gain) or protected from moisture loss (i.e., limiting moisture loss).

[0005] Embodiments of the recyclable packaging film include: (1) an unoriented multilayer film, the unoriented multilayer film comprising: a first surface, the first surface comprising a first layer, the first layer comprising a polymer selected from the group consisting of cyclic olefin copolymers, ethylene vinyl alcohol copolymers or polyamides, the thickness of the first layer being in the range of 5% to 15% of the thickness of the unoriented multilayer film; a second layer, the second layer comprising a density of 0.89 g / cm 3 Up to 0.94g / cm 3range of polyethylene, the second layer being directly adjacent to the first layer, the thickness of the second layer being in the range of 5% to 60% of the thickness of the unoriented multilayer film; and a third layer comprising high density polyethylene, the third layer being directly adjacent to the second layer, the thickness of the third layer being in the range of 15% to 75% of the thickness of the unoriented multilayer film; (2) a vapor deposited layer, the vapor deposited layer being located on the first surface; and (3) a total composition, the total composition comprising greater than 90 weight percent of a polyethylene-based polymer.

[0006] In some embodiments, the non-oriented multilayer film further comprises a second surface opposite the first surface, the second surface comprising a fourth layer comprising a polyethylene polymer.

[0007] In some embodiments, the recyclable packaging film further comprises a sealant layer attached to the non-oriented multilayer film.

[0008] In some embodiments, the sealing layer is patterned.

[0009] In some embodiments, the vapor deposited layer comprises a metal, and the optical density of the recyclable packaging film is in a range of 1.5 to 4.5 as measured by ASTM D1003.

[0010] In some embodiments, the vapor deposited layer comprises an inorganic oxide.

[0011] In some embodiments, the first layer includes the cyclic olefin copolymer, the ethylene vinyl alcohol copolymer, or the polyamide in a range of 90 wt % to 100 wt %.

[0012] In some embodiments, the polymer of the first layer is completely amorphous.

[0013] In some embodiments, the polymer of the first layer is a cyclic olefin copolymer comprising a glass transition temperature in the range of 60°C to 180°C.

[0014] In some embodiments, the first layer is free or substantially free of particles.

[0015] In some embodiments, the first layer is free or substantially free of polyethylene polymers.

[0016] In some embodiments, the density of the polyethylene contained in the second layer is 0.910 g / cm 3 Up to 0.940g / cm 3 within the range.

[0017] In some embodiments, the third layer comprises in the range of 90 wt % to 100 wt % high density polyethylene.

[0018] In some embodiments, the high density polyethylene is bimodal in molecular weight.

[0019] In some embodiments, the high density polyethylene has a melt flow rate greater than 1 g / 10 minutes as measured by ASTM D1238-10.

[0020] In some embodiments, the high density polyethylene is nucleated.

[0021] In some embodiments, the total composition includes a non-polyethylene content in the range of 5 wt % to 15 wt %.

[0022] In some embodiments, the recyclable packaging film has a curl of less than 90% according to an X-Cut Curl Test.

[0023] In some embodiments, the recyclable packaging film further has an oriented polyethylene-based film attached to the vapor deposited layer of the unoriented multilayer film.

[0024] Some embodiments of the recyclable packaging film include: (1) an unoriented multilayer film, the unoriented multilayer film comprising: a first surface, the first surface comprising a first layer, the first layer comprising 100 wt% of a cyclic olefin copolymer, the thickness of the first layer being in the range of 5% to 15% of the thickness of the unoriented multilayer film; a second layer, the second layer comprising a density of 0.89 g / cm 3 Up to 0.94g / cm 3 range of polyethylene, the second layer being directly adjacent to the first layer, the thickness of the second layer being in the range of 5% to 30% of the thickness of the unoriented multilayer film; and a third layer comprising greater than 95 wt % high density polyethylene, the third layer being directly adjacent to the second layer, the thickness of the third layer being in the range of 50% to 75% of the thickness of the unoriented multilayer film; (2) a vapor deposited layer, the vapor deposited layer being located on the first surface; (3) an oriented polyethylene film, the oriented polyethylene film being attached to the vapor deposited layer; (4) a patterned sealing layer, the patterned sealing layer being attached to the unoriented multilayer film on a second surface, the second surface being opposite to the first surface; and (5) a total composition, the total composition comprising greater than 90 wt % of a polyethylene-based polymer.

[0025] Some embodiments of the recyclable packaging film include: (1) an unoriented multilayer film, the unoriented multilayer film comprising: a first surface, the first surface comprising a first layer, the first layer comprising 100 wt% of a cyclic olefin copolymer, the thickness of the first layer being in the range of 5% to 15% of the thickness of the unoriented multilayer film; a second layer, the second layer comprising a density of 0.89 g / cm 3 Up to 0.94g / cm 3 range of polyethylene, the second layer being directly adjacent to the first layer, the thickness of the second layer being in the range of 40% to 60% of the thickness of the unoriented multilayer film; and a third layer comprising greater than 95% by weight of high density polyethylene, the third layer being directly adjacent to the second layer, the thickness of the third layer being in the range of 15% to 45% of the thickness of the unoriented multilayer film; (2) a vapor deposited layer, the vapor deposited layer being located on the first surface; (3) an oriented polyethylene film, the oriented polyethylene film being attached to the vapor deposited layer; (4) a sealing layer, the sealing layer being attached to the unoriented multilayer film on a second surface, the second surface being opposite to the first surface; and (5) a total composition, the total composition comprising greater than 90% by weight of a polyethylene-based polymer.

[0026] Also disclosed herein are embodiments of packaging comprising a recyclable packaging film. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The present disclosure may be more fully understood by considering the following detailed description of various embodiments of the present disclosure in conjunction with the accompanying drawings, in which:

[0028] Figure 1 is a perspective view of an embodiment of a package including a recyclable packaging film;

[0029] Figure 2 is a cross-sectional view of an embodiment of a recyclable packaging film;

[0030] Figure 3 is a cross-sectional view of an embodiment of a non-oriented multilayer film;

[0031] Figure 4 is a cross-sectional view of an embodiment of a non-oriented multilayer film;

[0032] Figure 5 is a cross-sectional view of an embodiment of a recyclable packaging film;

[0033] Figure 6 is a top view of an embodiment of a recyclable packaging film;

[0034] Figure 7 is a perspective view of an embodiment of a package including a recyclable packaging film;

[0035] Figure 8 is a cross-sectional view of an embodiment of a recyclable packaging film;

[0036] Fig. 9 is a perspective view of an embodiment of a package including a recyclable packaging film;

[0037] Fig. 10A It is a top view of the template used for the X-notch curl test;

[0038] Fig. 10B is a top view of a film sample used for X-notch curl test;

[0039] Fig. 10C and 10D yes Fig. 10B Side view of the membrane sample;

[0040] Fig. 10E is a plan view of the measuring device for the X-notch curl test; and

[0041] Fig.10F is a perspective view of performing an X-notch curl test.

[0042] The accompanying drawings show some but not all embodiments. The elements depicted in the drawings are illustrative and are not necessarily drawn to scale, and the same (or similar) reference numerals represent the same (or similar) features throughout the drawings. DETAILED DESCRIPTION

[0043] Disclosed herein is a recyclable packaging film with a high polyethylene content and a previously unobtainable high moisture vapor barrier (i.e., low moisture vapor barrier transmission) relative to a relatively thin structure. Also disclosed are packaging and packaged products that benefit from the recyclability of the packaging film, as well as performance characteristics such as runnability and high barrier. Examples of packaging forms that can utilize the recyclable packaging film disclosed herein include, but are not limited to, horizontal or vertical form fill seals, trays / cups and lids, bags or packages, gusseted bags, and pouches. Packaged products that can benefit from using the recyclable packaging film as described herein include, but are not limited to, consumer products, such as clothing and dishwashing detergents, sweet products, baked goods, cereals or products containing grains, dairy products or products containing dairy products, potato chips or biscuits, powdered products such as infant formula milk powder.

[0044] An embodiment of a package 10 including a recyclable packaging film 50 as described herein is shown in Figure 1 This configuration includes a tray and a lidding assembly made of a recyclable packaging film 50. The recyclable packaging film 50 is attached to the tray at the periphery of the opening of the tray by a seal 20. The seal 20 can be made by any known process, including but not limited to heat sealing, cold sealing, induction sealing, or ultrasonic sealing. Figure 1The packaging 10 shown in comprises a continuous seal 20, but other packaging forms may comprise more than one seal to form packaging.Other packaging forms may only comprise recyclable packaging film, or may comprise other packaging components, such as zippers.When packaging is airtightly sealed, the benefit of the high moisture barrier of recyclable packaging film is best recognized, thereby preventing moisture from being transmitted through any opening in the seal.Specific packaging forms and packaging applications will be described in conjunction with the specific embodiment of recyclable packaging film.

[0045] The embodiment of the recyclable packaging film 50 has the following features: Figure 2 The general structure shown. The recyclable packaging film 50 includes an unoriented multilayer film 100 having a first surface 104 and a second surface 106. A vapor deposition material layer 150 (i.e., a vapor deposition layer) is located on the first surface 104 of the unoriented multilayer film 100. The layers of the unoriented multilayer film 100 and the vapor deposition layer 100 will be discussed in more detail below. The recyclable packaging film 50 may also include a sealing layer to facilitate forming into packaging. The sealing layer may be in any position on the surface of the recyclable packaging film and may be continuous or patterned, which will be discussed in further detail.

[0046] As used herein, the recyclability of a recyclable packaging film is defined as having a total composition comprising greater than 90 wt%, greater than 92 wt%, greater than 94 wt%, greater than 96 wt%, or greater than 98 wt% of a polyethylene-based polymer. Correspondingly, the recyclable packaging film comprises less than 10%, less than 8%, less than 6%, less than 4%, or less than 2% of non-polyethylene-based polymer materials (i.e., contaminants). Advantageously, high levels of polyethylene-based polymers and low levels of contaminants contribute to easy recovery of the recyclable packaging film and packaging made thereof in the polyethylene recycling stream.

[0047] By using the design features of a recyclable packaging film as described herein, the inventors have discovered that the recyclable packaging film has an unexpectedly and advantageously low moisture vapor transmission rate (MVTR). Moisture vapor transmission rate, also known as water vapor transmission rate (WVTR), is the amount of water vapor that passes through a film or other article in a specific period of time. Packaging developers use a variety of moisture transmission control methods to ensure the integrity and shelf life of their products, including food, pharmaceuticals, and other moisture sensitive products. The MVTR values ​​reported herein have been measured according to ASTM F1249 using conditions of 100°F and 90% Rh in accordance with packaging industry standards. Some embodiments of the recyclable packaging film exhibit less than 0.2 g / m 2 / day MVTR levels, which is comparable to high barrier metallized biaxially oriented polypropylene (BOPP) films. The recyclable packaging films described herein may even be able to deliver MVTR performance, such that they may be used to replace foil-containing packaging films.

[0048] As indicated, recyclable packaging films include non-oriented multilayer films, which are referred to herein as Figure 3 An embodiment of the non-oriented multilayer film 100 includes a first layer 110 located at a first surface 104 and a third layer 130 located at a second surface 106. The second layer 120 is located between the first layer 110 and the third layer 130. As shown, the second layer 120 can be directly adjacent to the first layer 110, and the third layer 130 can be directly adjacent to the second layer 120.

[0049] As used herein, the term "layer" refers to a building block of a film or laminate that is a structure of a single material type, a uniform blend of materials, or a dispersed blend of materials. A layer can be a single polymer, a blend of materials within a single polymer type, or a blend of various polymers, can contain metallic materials, and can have additives. A layer can be continuous with the film (i.e., coextensive with the film) or a layer can be discontinuous or patterned. A layer has an insignificant thickness (z direction) compared to the length and width (xy direction), and is therefore defined as having two major surfaces, whose area is defined by the length and width of the layer. A layer may have sublayers.

[0050] Similarly, as used herein, the term "film" refers to a web constructed of layers and / or films, all of which are adjacent and connected to each other. For example, a film can be two multilayer films attached to each other by an adhesive layer. The film can be described as having a thickness that is not significant compared to the length and width of the film. Films are generally considered to have two main surfaces relative to each other that extend in length and width directions. As used herein, a "laminate" is a film that can be constructed of an unlimited number of films and / or layers, and the films and / or layers are bonded together by any known method, such as but not limited to coextrusion, coating or lamination, to form a composite product. As used herein, layers or films that are "directly in contact" or "directly adjacent" to each other have no intermediate material between them.

[0051] Recyclable packaging film includes unoriented multilayer film. As used herein, the term "unoriented" refers to a monolayer or multilayer film, sheet or web that is substantially not oriented after extrusion. If each of the layers or films that are part of the film is substantially not oriented after extrusion, the film is unoriented. As understood by the flexible packaging industry, orientation can be the result of film uniaxial orientation (machine direction or transverse direction) or biaxial orientation (machine direction and transverse direction) stretching, thereby increasing the machine direction and / or transverse direction dimensions, and subsequently reducing the thickness of the material. Orientation can be imparted to the film in one direction or two directions at a temperature just below the melting temperature of the polymer in the film. In this way, stretching "orients" the polymer chain, thereby changing the physical properties of the film. At the same time, stretching makes the film thinner. The resulting oriented film is thinner and can have significant changes in mechanical properties such as toughness, heat resistance, stiffness, tear strength and barrier properties. Orientation is usually achieved by a double bubble or triple bubble process, a tenter process or an MDO process using a heated roller. A typical blown or cast film process does impart some stretch to the film, but not enough to be considered oriented as described herein.

[0052] refer to Figure 3 The embodiment of the non-oriented multilayer film 100 shown in the figure, the first layer 110 is described in more detail. The first layer 110 is located at the first surface 104 of the non-oriented multilayer film 100 and serves as the surface to which the vapor deposited layer is attached. The thickness 112 of the first layer 110 is in the range of 5% to 15% of the thickness 102 of the non-oriented multilayer film 100. The thickness 112 of the first layer 110 can be in the range of 1 micron to 10 microns. The first layer 110 includes a polymer selected from the categories of cyclic olefin copolymers, ethylene vinyl alcohol copolymers, and polyamides, as described below.

[0053] In some embodiments, the polymer included in the first layer is completely amorphous, which is related to the crystallinity of the polymer. This amorphous property lends itself to extremely smooth surfaces, which subsequently improves the quality of layer deposition and subsequent barrier. The crystallinity of a polymer is directly related to whether the polymer melts like a typical solid, or whether the polymer transitions between a glassy state and a rubbery state without a sharp phase transition. Highly crystalline polymers have a more traditional melting point, such that when the highly crystalline polymers are heated, they reach a certain temperature at which the ordered arrangement of their long chain structures transitions to a random and disorganized arrangement. This value is usually designated as the melting point (T m ). Amorphous polymers do not suddenly melt when heated. Instead, when heated, they reach a temperature range where the material becomes less glassy and more rubbery. As a result, amorphous polymers do not have a melting point—they have a glass transition temperature (T g). The glass transition temperature of a particular polymer may be listed as a single temperature, but this number is a representative value representing a temperature range. A polymer may have crystalline regions and amorphous regions. However, when analyzed by DSC techniques, a completely amorphous polymer has very few or no crystalline regions and exhibits no melting point characteristics. Amorphous polymers are materials that are generally recognized by those skilled in the art by differential scanning calorimetry (DSC) to have no measurable melting point (less than 0.5 calories / g) and no heat of fusion, as measured by DSC using ASTM 3417-83.

[0054] The first layer may include a cyclic olefin copolymer (COC). The first layer may include at least 80 wt%, at least 85 wt%, at least 90 wt%, at least 95 wt%, or 100 wt% of one or more cyclic olefin copolymers. As used throughout this disclosure, the term "cyclic olefin copolymer" refers to a polymer produced by copolymerization of a cyclic monomer with ethylene. Examples of cyclic olefin copolymers include ethylene norbornene copolymers. The properties of the cyclic olefin copolymers, such as T g( The glass transition temperature of the cyclic olefin copolymer included in the first layer may be in the range of 60°C to 180°C or 60°C to 140°C. The glass transition temperature of the cyclic olefin copolymer may be lower than 180°C or lower than 140°C.

[0055] The first layer may include ethylene vinyl alcohol copolymer (EVOH). The first layer may include at least 80 wt%, at least 85 wt%, at least 90 wt%, at least 95 wt%, or 100 wt% of one or more ethylene vinyl alcohol copolymers. As used throughout this application, the term "ethylene vinyl alcohol copolymer," "EVOH copolymer," or "EVOH" refers to a copolymer comprising repeating units of ethylene and vinyl alcohol. The ethylene vinyl alcohol copolymer may be represented by the following general formula: [(CH2-CH2) n -(CH2-CH(OH))] n . Ethylene vinyl alcohol copolymers may include saponified or hydrolyzed ethylene vinyl acetate copolymers. EVOH refers to vinyl alcohol copolymers having ethylene comonomers and prepared by, for example, hydrolysis of vinyl acetate copolymers or by chemical reaction with vinyl alcohol. Ethylene vinyl alcohol copolymers may contain 27 mole percent (or less) to 48 mole percent (or more) of ethylene.

[0056] The first layer may include polyamide (PA). The first layer may include at least 80 wt%, at least 85 wt%, at least 90 wt%, at least 95 wt%, or 100 wt% of one or more polyamides. The term "polyamide" or "PA" refers to a polyamide having amide bonds (--CONH--) occurring along the molecular chain. nNylon is a high molecular weight polymer and includes "nylon" resins, which are well-known polymers with a large number of uses, including utility in packaging films. Examples of nylon polymer resins include: nylon 66, nylon 610, nylon 66 / 610, nylon 6 / 66, nylon 11, nylon 6, nylon 66T, nylon 612, nylon 12, nylon 6 / 12, nylon 6 / 69, nylon 46, nylon 6-3-T, nylon MXD-6, nylon MXDI, nylon 12T, and nylon 6I / 6T.

[0057] The first layer may be free of polyethylene polymer.

[0058] The first layer may be free of inorganic microparticles, such as antiblocking agents and slip agents, because these can destroy the smoothness of the first surface, thereby causing defects in the vapor deposited layer. As defined herein, "microparticles" are small particles with a maximum dimension (i.e., the largest cross dimension in any direction) of approximately 0.1 microns to 3 microns.

[0059] refer to Figure 3 The embodiment of the non-oriented multilayer film 100 shown in FIG. 1 is further described in detail about the second layer 120. The second layer 120 is located between the first layer 110 and the third layer 130. In some embodiments, as Figure 3 As shown in , the second layer 120 is directly adjacent to the first layer 110. In some embodiments, as Figure 3 As shown in FIG. 1 , the second layer 120 is directly adjacent to the third layer 130. The thickness 122 of the second layer 120 is in the range of 5% to 60% or 5% to 30% of the thickness 102 of the non-oriented multilayer film 100. The thickness 112 of the second layer 120 can be in the range of 10 microns to 50 microns. The second layer 120 includes a density of 0.89 g / cm 3 Up to 0.94g / cm 3 In the range of or 0.910g / cm 3 Up to 0.940g / cm 3 range of polyethylene polymers.

[0060] As used throughout this application, unless otherwise specified, the term "polyethylene polymer", "polyethylene" or "PE" refers to an ethylene homopolymer or copolymer. The term "polyethylene" or "PE" is used without regard to the presence or absence of substituent branching groups. Polyethylene includes, for example, medium density polyethylene, high density polyethylene, low density polyethylene, linear low density polyethylene, ultra low density polyethylene, ethylene alpha-olefin copolymers, or blends of the like. The second layer may contain at least 80 weight %, at least 90 weight %, or 100 weight % of a polyethylene polymer having a density of 0.89 g / cm 3 Up to 0.94g / cm 3 In the range of or 0.910g / cm 3Up to 0.940g / cm 3 within the range.

[0061] As used throughout this application, the term "medium density polyethylene" (MDPE) refers to polyethylene having a density of about 0.926 g / cm 3 To about 0.940g / cm 3 ethylene homopolymers and copolymers. Some embodiments of the non-oriented multilayer film include a second layer comprising MDPE. Some embodiments of the non-oriented multilayer film include a second layer comprising at least 60 wt%, at least 70 wt%, at least 80 wt%, at least 90 wt%, or 100 wt% MDPE. In some embodiments of the non-oriented multilayer film, the second layer comprises at least 65 wt% MDPE and at least 35 wt% of another polyethylene polymer.

[0062] refer to Figure 3 The embodiment of the non-oriented multilayer film 100 shown, the third layer 130 is described in more detail. The third layer 130 is located at the second surface 106 of the non-oriented multilayer film 100. The thickness 132 of the third layer 130 is in the range of 15% to 75% or 50% to 75% of the thickness 102 of the non-oriented multilayer film 100. The thickness 132 of the third layer 130 can be in the range of 1 micron to 50 microns. The third layer 130 includes high-density polyethylene. The third layer can contain at least 80%, at least 90% or 100% polyethylene polymer. Some embodiments of the non-oriented multilayer film include a third layer, and the third layer includes at least 60% by weight, at least 70% by weight, at least 80% by weight, at least 90% by weight or 100% by weight of HDPE.

[0063] As described above, examples of layer thickness ratios of the unoriented multilayer film including the first, second and third layers include 10% / 15% / 75%, 15% / 10% / 75% or 5% / 50% / 45%, wherein the layers are 1st / 2nd / 3rd.

[0064] As used throughout this application, the term "high density polyethylene" or "HDPE" refers to (a) a polyethylene having a density of about 0.960 g / cm 3 To about 0.970g / cm 3 and (b) a density of about 0.940 g / cm 3 To about 0.960g / cm 3The copolymer of ethylene and alpha-olefin (usually 1-butene or 1-hexene). High-density polyethylene includes polymers prepared with Ziegler or Phillips type catalysts and polymers prepared with single-site metallocene catalysts. The third layer includes at least 90% by weight of high-density polyethylene. In some embodiments, the third layer contains 100% high-density polyethylene. The high-density polyethylene can be bimodal in terms of molecular weight. Bimodal high-density polyethylene (HDPE) resin benefits from its bimodality by having the strength and stiffness of HDPE while maintaining the other properties of unimodal medium-density polyethylene. The melt flow rate (i.e., melt index) of the high-density polyethylene can be greater than 1 gram / 10 minutes, as measured by ASTM D1238-10 "Standard Test Method for Melt Flow Rate of Thermoplastics by Extrusion Plastometer" under the conditions of 190°C / 2.16kg. The third layer may include a high-density polyethylene that has been nucleated.

[0065] Selecting a high density polyethylene having a melt flow rate greater than 1 g / 10 min and including a nucleating agent for the third layer having bimodality can allow the third layer to crystallize faster and thus obtain greater stiffness. Without being bound by theory, the inventors believe that the stiffness of the third layer combined with the spacing from the first layer improves the barrier of the recyclable packaging film. The increased stiffness of the third layer prevents curling, and due to the structure and assembly of the unoriented multilayer film, the curl of the recyclable packaging film can be less than 90%, or less than 80%, or less than 70%, or less than 60%, or less than 50%, according to the X-notch curl test defined below.

[0066] The curl of a film as represented herein is measured by the "X-cut" curl test. A film sample is obtained, and the machine direction is recorded. The film sample should be maintained at 73°F and 50% relative humidity during the measurement and for at least 24 hours prior to the measurement. The film sample must be large enough to accommodate a complete "X" cut, as will be described. According to Fig. 10A A cutting template 500 of the design shown in FIG. 5 is placed on top of the film sample and an X is cut into the film sample following the template. The template 500 has an X shape for guiding the cutting, the X being formed by two overlapping lines, each having a length of four inches. Fig. 10B As shown, the resulting film sample 505 has four triangular segments (510A, 510B, 510C, 510D). The length of each cut edge of each triangular segment is two inches. Triangular segments 510A and 510C point in the machine direction 501 of the film sample 505, and triangular segments 510B and 510D point in the transverse direction of the film sample 505. Each triangular segment has a corresponding free point (511A, 511B, 511C, 511D), as shown in FIG. Fig. 10C and 10D A side view of the membrane sample 505 is shown. Fig. 10C and10D The curling of the film sample is shown after the X has been cut and the template removed from the film sample 505. If the free point is not curled up, away from the workbench, the film samples are turned over so that they are curled up.

[0067] To measure the curl in the machine direction (MD), an angle template (such as Fig. 10E Place the angle template with the graduated 0 degree edge approximately 1 mm from the tip of the free point to be measured (see Fig.10F ). The curl of the film is where the free point is closest to the angle template.

[0068] Now turn to Figure 4 The embodiment of the non-oriented multilayer film 100' is shown, depicting the possible presence of a fourth layer 140. The embodiment shown has a fourth layer 140, which is specifically a sealant layer 160. In this case, the sealant layers 140, 160 are located at the second surface 106 of the non-oriented multilayer film 100' and are directly adjacent to the third layer 130. The sealant layer 160 is coextensive with the non-oriented multilayer film 100'. The fourth layer 140 may contain at least 80 wt%, at least 90 wt%, or 100 wt% of a polyethylene polymer.

[0069] As described above, examples of layer thickness ratios for an unoriented multilayer film comprising a first layer, a second layer, a third layer, and a fourth layer include 5% / 10% / 75% / 10%, 15% / 10% / 65% / 10%, 10% / 60% / 10% / 20%, or 5% / 55% / 5% / 35%, wherein the layers are 1st / 2nd / 3rd / 4th.

[0070] As used herein, the term "seal layer" is a layer of recyclable packaging film located at the outer surface that provides adhesion to the surface of another article by sealing. The seal layer may contain a material suitable for forming a heat seal, such as a low sealing temperature polymer. The seal layer may contain a material that forms a seal under a single pressure, i.e., a cold seal blend.

[0071] The sealing layer of recyclable packaging film can have the composition that will allow to form heat seal, thereby form airtight sealed packaging.As used herein, the term "heat seal", "heat sealable" or "heat sealable" refers to that two or more surfaces have been or can be combined together by applying both heat and pressure.Heat seal is a well-known and commonly used method for producing packaging, and is familiar to those skilled in the art.Not wishing to be bound by theory, during heat seal, the sealing layer softens due to applying heat, thereby allowing to form heat seal bonding.Due to the temperature that must drive heat through the whole recyclable packaging film to raise the sealing layer, it is advantageous if the heat sealable material softens and seals at a relatively low temperature.Lower seal initiation temperature (SIT) can achieve faster packaging line speed.For example, some embodiments of recyclable packaging film may include a sealing layer, and the sealing layer shows a SIT of less than or equal to 140 ℃, less than or equal to 130 ℃ or less than or equal to 120 ℃.The possible heat sealable material included in the sealing layer may include but is not limited to acrylate copolymers, PET, PE, PP or hot melts (based on wax).

[0072] The sealing layer may alternatively be a pressure-sensitive cold seal. This embodiment of the recyclable packaging film is advantageous because the formation of the package does not require heat. Without intending to be bound by theory, the pressure-sensitive cold seal may be advantageous for the packaging of heat-sensitive products (e.g., ice cream or chocolate). Embodiments of the recyclable packaging film may include a pressure-sensitive cold seal system including, but not limited to, natural or synthetic polyisoprene latex or styrene-butadiene copolymer latex. The cold seal material may include a blend comprising acrylates and / or tackifiers.

[0073] In other embodiments of the unoriented multilayer film, the fourth layer can be located at the second surface of the unoriented multilayer film, but is a laminating layer rather than a sealing layer. The laminating layer can be formulated to provide good adhesion to another surface within the laminate. In other words, the laminating layer is the outer layer of a film such as the unoriented multilayer film that becomes adjacent to an adhesive layer within the laminate, such as a recyclable packaging film.

[0074] Unoriented multilayer films may contain additional layers at any position.

[0075] The vapor deposited layer is located on the first surface of the unoriented multilayer film. The vapor deposited layer may include one or more metals, such as aluminum. The vapor deposited layer may include an inorganic oxide, such as aluminum oxide or silicon oxide. The thickness of the vapor deposited layer may be in the range of 0.005 to 0.1 microns. The vapor deposited layer has been applied to the first surface of the unoriented film by any of a variety of known vapor deposition methods, thereby producing a very thin high moisture barrier layer. The vapor deposition method may include, but is not limited to, vacuum deposition, chemical vapor deposition, sputtering, and electroplating. The vapor deposition method involves an action or method of depositing a continuous metal, metal oxide, or metal alloy layer onto the surface of a polymer substrate.

[0076] The metal used can change, but aluminum, silicon, zinc, gold, silver or such suitable alloy is preferred, wherein aluminum or aluminum-containing alloy is particularly preferred.As will be appreciated by those skilled in the art, although the metal coating is mainly composed of the metal (such as aluminum) identified, a certain amount of other additives may be present to improve the classification physical and optical properties of the deposited metal layer.In some cases, pure aluminum (or selected metal) may be used.Other additives may be used in small quantities so that aluminum (or selected metal) is a major component.In terms of processing and cost, vacuum deposition is the preferred method of metallization.In any case, the thickness of the metal coating is preferably less than the thickness of the polymer substrate deposited thereon, preferably substantially less than the thickness of the substrate.By contrast, the thickness of the typical metal foil used for packaging film application is between 4.3 and 150 microns.

[0077] The vapor deposited layer can be an aluminum layer, such as commonly used in films for packaging. The thin aluminum layer is usually applied to oriented films, such as oriented polyester (OPET) or oriented polypropylene (OPP). Aluminum can be applied to unoriented multilayer films with a thickness sufficient to achieve an optical density in the range of 1.0 to 4.5, or 1.5 to 4.5, or 1.5 to 3.0. The optical density of the film can be measured by ASTM D1003.

[0078] As previously discussed, the unoriented multilayer film may include a sealing layer located at the second surface (see Figure 4 ). Alternatively, the recyclable packaging film may incorporate a sealing layer that is not within the non-oriented multilayer film. In these embodiments, the sealing layer is attached to the non-oriented multilayer film and may be located on either side of the non-oriented multilayer film. In any embodiment, the sealing layer may be located at the surface of the recyclable packaging film so that the sealing layer may perform a sealing function. Examples of sealing layers that are not within the non-oriented multilayer film are shown in Figure 5 , 6 and 8.

[0079] In some embodiments, the sealing layer acts as a caulking agent. In some embodiments, the sealing layer flows into the gap of the triple point region (described below) under sealing conditions. Without intending to be bound by theory, the ability to properly seal the triple point can be produced by a combination of material properties, coating weight and sealing conditions. It is believed that having a relatively thick sealing material in the heat seal area greatly increases the possibility of reducing the size of the triple point region of the seal. In one or more preferred embodiments, the sealing layer is not directional.

[0080] An embodiment of a recyclable packaging film 50' having a patterned sealing layer 160 is shown in Figure 5 (cross-sectional view) and Figure 6 (plan view). The recyclable packaging film 50' comprises a non-oriented multilayer film having a first layer 110, a second layer 120, a third layer 130, a fourth layer 140, a first surface 104 and a second surface 106. The patterned sealing layer 160 is attached to the second surface 106 ( Figure 6 ). As previously discussed, the non-oriented multilayer film has a vapor deposited layer 150 located on the first surface 104. In addition, the recyclable packaging film 50' includes an oriented polyethylene film 170 attached to the vapor deposited layer 150 by an adhesive layer 180.

[0081] The pattern of the sealing layer, Figure 6 In the example shown in, it can be specifically located in the area required for sealing. This position of the patterned sealing layer allows airtightness, thereby allowing material to be minimized while maintaining high performance. As used herein, the term "patterning" means that the sealing layer is discontinuous with the recyclable packaging film. The sealing layer is discontinuous with the polymer film on which the sealing layer is applied. The sealing layer can be applied to the area of ​​the recyclable packaging film that involves sealing to close the package. The sealing layer can be applied on the surface of the polymer film that is greater than or equal to 5%, greater than or equal to 10%, or greater than or equal to 15%. The sealing layer can be applied on a polymer film that is less than or equal to 30%, less than or equal to 25%, or less than or equal to 20%. Therefore, the inner surface of the recyclable packaging film is partially an unoriented multilayer film and partially a sealing layer. For example, the inner surface of the recyclable packaging film can be about 80% of the polymer film and 20% of the sealing layer. The inner surface can be substantially composed of or composed of a polymer film and a sealing layer.

[0082] Figure 6 A plan view of the inner surface of an embodiment of a recyclable packaging film 50' is shown, which can be used to produce flow wrap packaging, such as Figure 7 The package 10' is shown in FIG. Figure 7The package 10' is made entirely of recyclable packaging film 50', sealed to itself at seals 20 along the length and ends of the package. The interior surface of the package also includes a second surface 106 of the non-oriented multilayer film in the area not covered by the sealable layer 160. Figure 6 In the embodiment of the present invention, the bottom corner of the recyclable packaging film 50' is turned upward to expose the oriented polyethylene film 170 on the opposite surface.

[0083] The sealant layer may be of a thickness that allows a hermetic seal to be applied even in challenging applications such as triple point region sealing. In some embodiments, the sealant layer may be greater than or equal to 1 g / m 2 Or greater than or equal to 3g / m 2 In other embodiments, the sealant layer may be less than or equal to 8 g / m 2 , less than or equal to 9g / m 2 Or less than or equal to 10g / m 2 For example, the basis weight of the sealing layer can be about 1 g / m 2 About 10g / m 2 In the range of about 3g / m 2 About 9g / m 2 within the range.

[0084] As used herein, the term "basis weight" is used to refer to the weight of the material present in a predetermined area of ​​a film or layer. Typically, the defined area is square meters, but any area can be used. The area is defined in the length-width (i.e., xy direction) of the film or layer. A material of a given thickness (z direction) and density has a specific weight when covering a defined area (i.e., square meters). Materials applied in discontinuous layers (such as patterned sealing layers) can be defined by basis weight. In the case of a pattern, basis weight refers to the amount of material by weight present when covering a defined area. It is common in the film conversion industry to use basis weight to measure the weight of materials such as patterned materials.

[0085] The term "adhesive layer" or "tie layer" refers to a layer or material placed on one or more layers to promote adhesion of the layer to another surface. For example, a tie layer may be positioned between two layers of a multilayer film to maintain the two layers in position relative to each other and prevent undesirable stratification. In another example, an adhesive layer may be positioned between two films of a laminate to maintain the two layers in position relative to each other and prevent undesirable stratification. The adhesive layer may be formed by a traditional two-component reactive system, which may be solvent-based, solvent-free, water-based or energy-cured. The adhesive layer may be a polymer layer applied by an extrusion lamination process.

[0086] Figure 5 and 6The oriented polyethylene film included in the recyclable packaging film shown can be machine direction oriented (MDOPE) or biaxially oriented (BOPE). The oriented polyethylene film can be a single layer or a multilayer. The oriented polyethylene film can contain at least 80 weight %, at least 90 weight % or 100 weight % of polyethylene polymer. The oriented polyethylene film can be a machine direction oriented (MDO) film and can include HDPE.

[0087] Another embodiment of a recyclable packaging film 50" is shown in Figure 8 The recyclable packaging film 50" includes a non-oriented multilayer film having a first layer 110, a second layer 120, a third layer 130, a first surface 104, and a second surface 106. The vapor deposited layer is located on the first surface 104 of the non-oriented multilayer film. As previously described in Figure 5 , this embodiment includes an oriented polyethylene film 170 connected to a vapor deposited layer 150 by an adhesive layer 180. A second adhesive layer 180 adheres a sealing layer 160 in the form of a sealing film to the second surface 106 of the non-oriented multilayer film.

[0088] In other embodiments of the recyclable packaging film, a sealing layer may be applied to the structure without the use of an adhesive layer, such as by an extrusion coating process.

[0089] Figure 8 The recyclable packaging film 50" can be used for Fig. 9 The package 10" shown in FIG. 1 is a side and bottom gusseted bag. Each panel of the package 10" is composed of a recyclable packaging film 50".

[0090] The overall design of the recyclable packaging film as disclosed herein provides an advantageous combination of film properties that were previously unattainable. The design of the film incorporates a relatively thin film that has excellent barrier properties while maintaining the recyclability of the polyethylene flexible material stream due to the high polyethylene content. Specifically, the design of the unoriented multilayer film produces a low curl / high stiffness film that exhibits enhanced barrier properties when metallized. In addition, the unoriented form of the film increases the puncture resistance of the film. Further advantageous is the unoriented nature of the film, which allows a high performance sealant layer to be easily incorporated into a fully coextruded film.

[0091] As previously discussed, the recyclable packaging film can be used in packaging. The recyclable packaging film can be sealed to itself or other packaging components. The packaging can be in various forms and can advantageously be hermetically sealed. The hermetic seal provides protection for the packaged product (i.e., the product sealed within the packaging). The packaging can take the forms discussed in detail herein ( Figure 1 Tray / lid, Figure 7 Mobile packages, Fig. 9The packaging may be in the form of a bag or any other form, such as a pouch. The seal used to form the package may be fused or peelable, as is generally known to those skilled in the art of packaging. The package may have an opening feature, such as a peelable seal, a tear notch, or a laser score.

[0092] The packaging components used in addition to the recyclable packaging film may include but are not limited to cups, trays, paper / paperboard, zippers or spouts. The packaging components comprising recyclable packaging film can be independently recyclable. Some packaging components may be non-recyclable, but can be separated from the recyclable packaging components subsequently. Each packaging component in the packaging component can be reclaimed in identical recycling streams, so can keep connected when unpacking. Packing can have a total composition, which comprises a polymer based on polyethylene greater than 90 % by weight, greater than 92 % by weight, greater than 94 % by weight, greater than 96 % by weight or greater than 98 % by weight. Correspondingly, the total composition of packaging can comprise a non-polyethylene-based polymer material (that is, pollutant) less than 10%, less than 8%, less than 6%, less than 4% or less than 2%.

[0093] Examples

[0094] Example 1: Easy-to-tear feature

[0095] The unoriented multilayer film is produced by a blown film process. The total thickness of the film is 1.25 mils (31.75 microns) and the basis weight is about 19.0 lb / rm. The layer details are summarized in Table 1. The listed layer contents are melt blended to produce a consistent uniform layer. In the list of layer contents, the values ​​are given in weight %. The first layer of the unoriented multilayer film does not contain anti-blocking, slip and polyethylene polymers.

[0096] The non-oriented multilayer film was then metallized with aluminum using a vacuum deposition process. The aluminum metallization was applied to the exposed surface of the first layer. The final optical density of the film was 3.8. The resulting MVTR of this metallized non-oriented film was 0.107 g / m2 / day measured at 100°F and 90% Rh according to ASTM F1249.

[0097] The metallized unoriented multilayer film adhesive was then laminated to a 1 mil (25.4 micron) MDOPE film having a general structure of HDPE / mLLDPE / HDPE / mLLDPE / HDPE. The MDOPE film had been oriented in the machine direction at a ratio of 5.5:1. The MDOPE was attached to the metallized surface of the metallized unoriented multilayer film. Approximately 1.25 lb / rm of adhesive was used in the lamination.

[0098] Finally, a patterned cold seal layer was applied to the exposed fourth layer of the non-oriented multilayer film.The cold seal material was applied at about 43.5 lb / rm.

[0099] Thus, the final recyclable packaging film of Example 1 had the following structure: 1 mil MDOPE / adhesive / vapor deposited layer / 1.25 mil unoriented multilayer film / cold seal. This film had an overall composition including 92 wt% polyethylene-based material.

[0100] Table 1: Structural details of the unoriented multilayer film of Example 1

[0101]

[0102] The recyclable packaging film of Example 1 has an MVTR of about 0.06 g / m2 / day measured at 100°F and 90% Rh according to ASTM F1249 and an OTR of about 1.75 cm3 / m2 / day measured at 73°F and 0% Rh according to ASTM F1927. The results of mechanical testing performed on Example 1 are shown in Table 2.

[0103] Table 2: Mechanical test results of the recyclable packaging film of Example 1

[0104]

[0105]

[0106] Example 2: Anti-drop function

[0107] The unoriented multilayer film is produced by a blown film process. The total thickness of the film is 1.25 mils (31.75 microns) and the basis weight is about 19.0 lb / rm. The layer details are summarized in Table 2. The listed layer contents are melt blended to produce a consistent uniform layer. In the list of layer contents, the values ​​are given in weight %. The first layer of the unoriented multilayer film does not contain anti-blocking, slip and polyethylene polymers.

[0108] The non-oriented multilayer film was then metallized with aluminum using a vacuum deposition process. The aluminum metallization was applied to the exposed surface of the first layer. The final optical density of the film was 3.4. The resulting MVTR of this metallized non-oriented film was 0.156 g / m2 / day measured at 100°F and 90% Rh according to ASTM F1249.

[0109] The metallized unoriented multilayer film was then extrusion laminated to a 1 mil (25.4 micron) MDOPE film having a general structure of HDPE / HDPE-mLLDPE / LMDPE / HDPE-mLLDPE / HDPE. The MDOPE film had been oriented in the machine direction at a ratio of 5.0:1. The MDOPE was attached to the metallized surface of the metallized unoriented multilayer film. An approximately 7 lb / rm LDPE adhesive film was used to produce an intermediate laminate film.

[0110] The intermediate laminate film was then extrusion laminated to a 3 mil LLDPE blown film. The unoriented multilayer film side of the intermediate laminate film was attached to the LLDPE blown film. About 10 lb / rm LDPE cling film was used to produce the recyclable packaging film of Example 2, which had the following structure: 1 mil MDOPE / 7 lb / rm LDPE / vapor deposited layer / 1.25 mil unoriented multilayer film / 10 lb / rm LDPE / 3.0 mil LLDPE. This film had a total composition comprising nearly 100% polyethylene-based polymers.

[0111] Table 3: Structural details of the unoriented multilayer film of Example 2

[0112]

[0113] The recyclable packaging film of Example 2 has a relative humidity of about 0.11 g / m 2 as measured at 100° F. and 90% Rh according to ASTM F1249. 2 MVTR / day and about 19 cm measured at 73°F and 0% Rh per ASTM F1927 3 / m 2 The results of mechanical testing performed on Example 2 are shown in Table 4.

[0114] Table 4: Mechanical test results of the recyclable packaging film of Example 2

[0115]

[0116]

[0117] Comparative Examples 3 and 4: Comparison of Metallized Films

[0118] As noted above, the metallized non-oriented multilayer films (unlaminated films) used in Examples 1 and 2 had excellent MVTR. These results are reproduced in Table 6 below along with the MVTR results for Comparative Example Films 3 and 4.

[0119] Comparative Example 3 is a metallized 1.25 mil blown film having a general structure of LLDPE / linked / EVOH / linked / LLDPE / COC / vapor deposition. The detailed composition of the blown film is shown in Table 5. In particular, this film has a COC layer containing polyethylene, and the film lacks a "third layer" containing HDPE.

[0120] Table 5: Structural details of the unoriented multilayer film of Comparative Example 3

[0121]

[0122] Comparative Example 4 is a metallized 1 mil (25.4 micrometer) MDOPE film having a general structure of HDPE / HDPE-mLLDPE / LMDPE / HDPE-mLLDPE / HDPE. The MDOPE film had been oriented in the machine direction at a ratio of 5.0:1.

[0123] Table 6: Comparison of MVTR of metallized films

[0124]

[0125] Example

[0126] Embodiment A. A recyclable packaging film comprising:

[0127] An unoriented multilayer film, comprising:

[0128] a first surface, the first surface comprising a first layer, the first layer comprising a polymer selected from the group consisting of a cyclic olefin copolymer, an ethylene vinyl alcohol copolymer, or a polyamide, the first layer having a thickness in a range of 5% to 15% of the thickness of the non-oriented multilayer film;

[0129] The second layer comprises a density of 0.89 g / cm 3 Up to 0.94g / cm 3 The second layer is directly adjacent to the first layer, the thickness of the second layer is in the range of 5% to 60% of the thickness of the non-oriented multilayer film; and

[0130] a third layer comprising high density polyethylene, the third layer being directly adjacent to the second layer, the third layer having a thickness in a range of 15% to 75% of the thickness of the non-oriented multilayer film;

[0131] a vapor deposited layer located on the first surface; and

[0132] The total composition comprises greater than 90% by weight of a polyethylene-based polymer.

[0133] Embodiment B. The recyclable packaging film according to embodiment A, wherein the non-oriented multilayer film further comprises a second surface opposite to the first surface, the second surface comprising a fourth layer comprising a polyethylene polymer.

[0134] Embodiment C. The recyclable packaging film of embodiment A or B, further comprising a sealant layer attached to the non-oriented multilayer film.

[0135] Embodiment D. The recyclable packaging film according to embodiment C, wherein the sealing layer is patterned.

[0136] Embodiment E. The recyclable packaging film according to any one of embodiments A to D, wherein the vapor deposited layer comprises a metal, and the optical density of the recyclable packaging film is in the range of 1.5 to 4.5 as measured by ASTM D1003.

[0137] Embodiment F. The recyclable packaging film of any one of Embodiments A to D, wherein the vapor deposited layer comprises an inorganic oxide.

[0138] Embodiment G. The recyclable packaging film of any one of embodiments A to F, wherein the first layer comprises 90 wt % to 100 wt % of the cyclic olefin copolymer, the ethylene vinyl alcohol copolymer or the polyamide.

[0139] Embodiment H. The recyclable packaging film of any one of Embodiments A to G, wherein the polymer of the first layer is completely amorphous.

[0140] Embodiment I. The recyclable packaging film of any one of Embodiments A to H, wherein the polymer of the first layer is a cyclic olefin copolymer comprising a glass transition temperature in the range of 60°C to 180°C or 60°C to 140°C.

[0141] Embodiment J. The recyclable packaging film of any one of Embodiments A to I, wherein the first layer is free of microparticles.

[0142] Embodiment K. The recyclable packaging film of any one of Embodiments A to J, wherein the first layer is free of polyethylene polymers.

[0143] Embodiment L. A recyclable packaging film according to any one of Embodiments A to K, wherein the density of the polyethylene contained in the second layer is 0.910 g / cm 3 Up to 0.940g / cm 3 within the range.

[0144] Embodiment M. The recyclable packaging film of any one of Embodiments A to L, wherein the third layer comprises high density polyethylene in the range of 90 wt % to 100 wt %.

[0145] Embodiment N. The recyclable packaging film of any one of Embodiments A to M, wherein the high density polyethylene is bimodal in terms of molecular weight.

[0146] Embodiment O. The recyclable packaging film of any one of Embodiments A to N, wherein the high density polyethylene has a melt flow rate greater than 1 g / 10 min as measured by ASTM D1238-10.

[0147] Embodiment P. The recyclable packaging film of any one of Embodiments A to O, wherein the high density polyethylene is nucleated.

[0148] Embodiment Q. The recyclable packaging film of any one of Embodiments A to P, wherein the total composition comprises a non-polyethylene content in the range of 5 wt % to 15 wt %.

[0149] Embodiment R. The recyclable packaging film of any one of Embodiments A to Q, further comprising a curl of less than 90% according to the X-Notch Curl Test.

[0150] Embodiment S. The recyclable packaging film of any one of Embodiments A to R, further comprising an oriented polyethylene-based film attached to the vapor deposited layer of the unoriented multilayer film.

[0151] Embodiment T. A recyclable packaging film comprising:

[0152] An unoriented multilayer film, comprising:

[0153] a first surface, the first surface comprising a first layer, the first layer comprising 100 wt % of a cyclic olefin copolymer, the first layer having a thickness in a range of 5% to 15% of the thickness of the non-oriented multilayer film;

[0154] The second layer comprises a density of 0.89 g / cm 3 Up to 0.94g / cm 3 The second layer is directly adjacent to the first layer, the thickness of the second layer is in the range of 5% to 30% of the thickness of the non-oriented multilayer film; and

[0155] a third layer comprising greater than 95% by weight of high density polyethylene, the third layer being directly adjacent to the second layer, the third layer having a thickness in the range of 50% to 75% of the thickness of the non-oriented multilayer film;

[0156] a vapor deposition layer, the vapor deposition layer being located on the first surface;

[0157] an oriented polyethylene film attached to the vapor deposited layer;

[0158] a patterned sealing layer attached to the unoriented multilayer film on a second surface opposite the first surface; and

[0159] The total composition comprises greater than 90% by weight of a polyethylene-based polymer.

[0160] Embodiment U. A recyclable packaging film comprising:

[0161] An unoriented multilayer film, comprising:

[0162] a first surface, the first surface comprising a first layer, the first layer comprising 100 wt % of a cyclic olefin copolymer, the first layer having a thickness in a range of 5% to 15% of the thickness of the non-oriented multilayer film;

[0163] The second layer comprises a density of 0.89 g / cm 3 Up to 0.94g / cm 3 The second layer is directly adjacent to the first layer, the thickness of the second layer is in the range of 40% to 60% of the thickness of the non-oriented multilayer film; and

[0164] a third layer comprising greater than 95% by weight of high density polyethylene, the third layer being directly adjacent to the second layer, the third layer having a thickness in a range of 15% to 45% of the thickness of the non-oriented multilayer film;

[0165] a vapor deposition layer, the vapor deposition layer being located on the first surface;

[0166] an oriented polyethylene film attached to the vapor deposited layer;

[0167] a sealing layer attached to the non-oriented multilayer film on a second surface opposite the first surface; and

[0168] The total composition comprises greater than 90% by weight of a polyethylene-based polymer.

[0169] Embodiment V. A package comprising the recyclable packaging film according to any one of embodiments A to U.

Claims

1. A recyclable packaging film, comprising: An unoriented multilayer film, comprising: a first surface, the first surface comprising a first layer, the first layer comprising a polymer selected from the group consisting of a cyclic olefin copolymer, an ethylene vinyl alcohol copolymer, or a polyamide, the The thickness of the first layer is in the range of 5% to 15% of the thickness of the non-oriented multilayer film; The second layer comprises a density of 0.89 g / cm 3 Up to 0.94g / cm 3 The second layer is directly adjacent to the first layer, and the thickness of the second layer is in the range of 5% to 60% of the thickness of the non-oriented multilayer film; as well as a third layer comprising high density polyethylene, the third layer being directly adjacent to the second layer, the third layer having a thickness in a range of 15% to 75% of the thickness of the non-oriented multilayer film; a vapor deposition layer, the vapor deposition layer being located on the first surface; as well as The total composition comprises greater than 90% by weight of a polyethylene-based polymer.

2. The recyclable packaging film of claim 1, wherein the non-oriented multilayer film further comprises a second surface opposite to the first surface, the second surface comprising a fourth layer comprising a polyethylene polymer.

3. The recyclable packaging film of claim 1, further comprising a sealant layer attached to the non-oriented multilayer film. The recyclable packaging film according to claim 3 , wherein the sealing layer is patterned. 5 . The recyclable packaging film according to claim 1 , wherein the vapor deposited layer comprises a metal, and an optical density of the recyclable packaging film is within a range of 1.5 to 4.5 measured by ASTM D1003. The recyclable packaging film according to claim 1 , wherein the vapor deposited layer comprises an inorganic oxide.

7. The recyclable packaging film according to claim 1, wherein the first layer comprises the cyclic olefin copolymer, the ethylene vinyl alcohol copolymer or the polyamide in an amount ranging from 90 wt% to 100 wt%.

8. The recyclable packaging film of claim 1, wherein the polymer of the first layer is completely amorphous.

9. The recyclable packaging film of claim 1, wherein the polymer of the first layer is a cyclic olefin copolymer comprising a glass transition temperature in the range of 60°C to 180°C.

10. The recyclable packaging film of claim 1, wherein the first layer is free of particulates.

11. The recyclable packaging film of claim 1 , wherein the first layer is free of polyethylene polymers.

12. The recyclable packaging film according to claim 1, wherein the density of the polyethylene contained in the second layer is 0.910 g / cm 3 Up to 0.940g / cm 3 within the range.

13. The recyclable packaging film of claim 1, wherein the third layer comprises high density polyethylene in the range of 90 wt% to 100 wt%.

14. The recyclable packaging film of claim 1, wherein the high density polyethylene is bimodal in terms of molecular weight.

15. The recyclable packaging film of claim 1, wherein the high density polyethylene has a melt flow rate greater than 1 gram / 10 minutes as measured by ASTM D1238-10.

16. The recyclable packaging film of claim 1, wherein the high density polyethylene is nucleated.

17. The recyclable packaging film of claim 1, wherein the total composition comprises a non-polyethylene content in the range of 5 wt% to 15 wt%.

18. The recyclable packaging film of claim 1, further comprising a curl of less than 90% according to an X-CutCurl Test.

19. The recyclable packaging film of claim 1, further comprising an oriented polyethylene-based film attached to the vapor deposited layer of the non-oriented multilayer film.

20. A recyclable packaging film comprising: An unoriented multilayer film, comprising: a first surface, the first surface comprising a first layer, the first layer comprising 100 wt % of a cyclic olefin copolymer, the first layer having a thickness in a range of 5% to 15% of the thickness of the non-oriented multilayer film; The second layer comprises a density of 0.89 g / cm 3 Up to 0.94g / cm 3 The second layer is directly adjacent to the first layer, and the thickness of the second layer is in the range of 5% to 30% of the thickness of the non-oriented multilayer film; as well as a third layer comprising greater than 95% by weight of high density polyethylene, the third layer being directly adjacent to the second layer, the third layer having a thickness in the range of 50% to 75% of the thickness of the non-oriented multilayer film; a vapor deposition layer, the vapor deposition layer being located on the first surface; an oriented polyethylene film attached to the vapor deposited layer; a patterned sealing layer attached to the unoriented multilayer film on a second surface, the second surface opposite the first surface; as well as The total composition comprises greater than 90% by weight of a polyethylene-based polymer.

21. A recyclable packaging film comprising: An unoriented multilayer film, comprising: a first surface, the first surface comprising a first layer, the first layer comprising 100 wt % of a cyclic olefin copolymer, the first layer having a thickness in a range of 5% to 15% of the thickness of the non-oriented multilayer film; The second layer comprises a density of 0.89 g / cm 3 Up to 0.94g / cm 3 The second layer is directly adjacent to the first layer, and the thickness of the second layer is in the range of 40% to 60% of the thickness of the non-oriented multilayer film; as well as a third layer comprising greater than 95% by weight of high density polyethylene, the third layer being directly adjacent to the second layer, the third layer having a thickness in a range of 15% to 45% of the thickness of the non-oriented multilayer film; a vapor deposition layer, the vapor deposition layer being located on the first surface; an oriented polyethylene film attached to the vapor deposited layer; a sealing layer attached to the unoriented multilayer film on a second surface, the second surface opposite the first surface; as well as The total composition comprises greater than 90% by weight of a polyethylene-based polymer.

22. A package comprising the recyclable packaging film according to claim 3.

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