Multilayer film suitable for use as a label

Abstract

Disclosed herein are multilayer films and laminates. The multilayer film according to embodiments herein includes particular combinations of low density polyethylene and high density polyethylene to deliver desirable properties such as tear strength, elongation and modulus. The multilayer film can be used as a label on food packaging, for example, and can be used to form a laminate.

Description

[0001] MULTILAYER FILM SUITABLE FOR USE AS A LABEL

[0002] FIELD

[0003] Embodiments described herein relate to multilayer films suitable for use as a label comprising high density polyethylene and low density polyethylene, and a laminate comprising the same.

[0004] INTRODUCTION

[0005] Labels are one of many important applications of polymer-based films. Polyethylene -based labels can be moisture resistant and provide superior mechanical properties. Major label applications include document stickers, clothing tags, jars, bottles, and business cards. The industry currently uses different polymer films such as polypropylene, polyethylene, and PET films. For ease of recycling, it is typically best to match the polyethylene film with, for example, a polyethylene-based article such as a high density polyethylene jar or bottle. A multilayer film suitable for use as a label needs to have mechanical properties to ensure high productivity in printing and cutting with the application surface and with minimal distortion of printed matter. Challenges exist with polyethylene films suitable for use as labels because it is difficult to achieve desirable properties of low or easy tear in the transverse direction or machine direction along with low elongation and moderate stiffness. Accordingly, it is necessary to find ways to provide multilayer films that are made of polyethylene and deliver a balance of low or easy tear, moderate stiffness, and low elongation.

[0006] SUMMARY

[0007] In a first aspect, a multilayer film is disclosed. The multilayer film comprises: a first skin layer, a second skin layer, and one or more core layers, wherein: the first skin layer comprises at least 90 wt.% of a high density polyethylene having a density of at least 0.965 g / cc, based on the weight of the first skin layer; the second skin layer comprises at least 90 wt.% of a high density polyethylene having a density of at least 0.965 g / cc, based on the total weight of the second skin layer; and a core layer comprising a low density polyethylene having a density of 0.915 to 0.930 g / cc and a melt index (12) of 1.0 to 10.0 g / 10 min, and wherein the film comprises at least 25 wt.% high density polyethylene having a density of at least 0.965 g / cc, and at least 40 wt.% low density polyethylene having a density of 0.915 to 0.930 g / cc and a melt index of 1.0 to 10.0 g / 10 min, based on the total weight of the film.

[0008] In a second aspect, a laminate is disclosed. The laminate comprises a multilayer film according to the first aspect and a substrate, wherein the multilayer film is laminated to the substrate.

[0009] DETAILED DESCRIPTION

[0010] As used herein, the terms “polyethylene” or “ethylene -based polymer” shall mean polymers comprising a majority amount (>50 mol %) of units which have been derived from ethylene monomer. This includes polyethylene homopolymers and copolymers (meaning units derived from two or more comonomers). The terms “ethylene -based polymer” and “polyethylene” may be used interchangeably. Generally, polyethylene may be produced in gas-phase, fluidized bed reactors, liquid phase slurry process reactors, or liquid phase solution process reactors, using a heterogeneous catalyst system, such as Ziegler- Natta catalyst, a homogeneous catalyst system, comprising Group 4 transition metals and ligand structures such as metallocene, non-metallocene metal-centered, heteroaryl, heterovalent aryloxyether, phosphinimine, and others. Combinations of heterogeneous and / or homogeneous catalysts also may be used in either single reactor or dual reactor configurations.

[0011] Common forms of polyethylene known in the art include Low Density Polyethylene (LDPE); Linear Low Density Polyethylene (LLDPE); Ultra Low Density Polyethylene (ULDPE); Very Low Density Polyethylene (VLDPE); single-site catalyzed Linear Low Density Polyethylene, including both linear and substantially linear low density resins (m-LLDPE); ethylene -based plastomers (POP) and ethylene-based elastomers (POE); Medium Density Polyethylene (MDPE); and High Density Polyethylene (HDPE). These polyethylene materials are generally known in the art; however, the following descriptions may be helpful in understanding the differences between some of these different polyethylene resins.

[0012] As used herein, the term “linear low density polyethylene” or “LLDPE”, includes resin made using the traditional Ziegler-Natta catalyst systems and chromium-based catalyst systems as well as single-site catalysts, including, but not limited to, substituted mono- or bis-cyclopentadienyl catalysts (typically referred to as metallocene), constrained geometry catalysts, phosphinimine catalysts & polyvalent aryloxyether catalysts (typically referred to as bisphenyl phenoxy), and includes linear, substantially linear or heterogeneous polyethylene copolymers or homopolymers. LLDPEs contain less long chain branching than LDPEs and includes the substantially linear ethylene polymers which are further defined in U.S. Patent 5,272,236, U.S. Patent 5,278,272, U.S. Patent 5,582,923 and US Patent 5,733,155; the homogeneously branched linear ethylene polymer compositions such as those in U.S. Patent No. 3,645,992; the heterogeneously branched ethylene polymers such as those prepared according to the process disclosed in U.S. Patent No. 4,076,698; and / or blends thereof (such as those disclosed in US 3,914,342 or US 5,854,045). The LLDPEs can be made via gas-phase, solution-phase or slurry polymerization or any combination thereof, using any type of reactor or reactor configuration known in the art. The LLDPE, as used herein, have a density in the range of 0.900 to 0.940 g / cc.

[0013] The term “low density polyethylene” or “LDPE” as used herein refers to as “high pressure ethylene polymer” or “highly branched polyethylene” and is defined to mean that the polymer is partly or entirely homo-polymerized or copolymerized in autoclave or tubular reactors at pressures above 14,500 psi (100 MPa) with the use of free-radical initiators, such as peroxides (see for example US 4,599,392, which is hereby incorporated by reference). The LDPE have a density in the range of 0.915 to 0.940 g / cm3.

[0014] The terms “high density polyethylene” or “HDPE” refers to polyethylenes having densities greater than about 0.935 g / cm3and up to about 0.980 g / cm3, which are generally prepared with Ziegler-Natta catalysts, chrome catalysts, or single-site catalysts including, but not limited to, substituted mono- or bis- cyclopentadienyl catalysts (typically referred to as metallocene), constrained geometry catalysts, phosphinimine catalysts & polyvalent aryloxyether catalysts (typically referred to as bisphenyl phenoxy). The terms “comprising,” “including,” “having,” and their derivatives, are not intended to exclude the presence of any additional component, step or procedure, whether or not the same is specifically disclosed. In order to avoid any doubt, all compositions claimed through use of the term “comprising” may include any additional additive, adjuvant, or compound, whether polymeric or otherwise, unless stated to the contrary. In contrast, the term, “consisting essentially of’ excludes from the scope of any succeeding recitation any other component, step or procedure, excepting those that are not essential to operability. The term “consisting of’ excludes any component, step or procedure not specifically delineated or listed.

[0015] Disclosed herein are multilayer films. The multilayer film comprises a first skin layer, a second skin layer, and one or more core layers including “a core layer.” As used herein, the term “core layer” refers to a non-skin or non-outer layer of a multilayer film. A core layer is an internal layer, i.e., a layer positioned between two skin layers of a multilayer film. In one embodiment, a core layer is the non-skin layer of a three-layer film that comprises a first skin layer, a core layer, and a second skin layer (A / B / C where B is the core layer). In another embodiment, a core layer, a second core layer, and a third core layer are core layers in a five layer film with two skin layers (e.g., A / B / C / D / E, where B / C / D make up the core layers in no particular order). The totality of core layers in the multilayer film of this invention, i.e., one or a plurality, constitute the “core” or “the one or more core layers” of the multilayer film. The term “skin” refers to a layer of a film that is an outermost layer of the film and is not descriptive, for example, of whether a layer is on the inside or outside of a package.

[0016] In some embodiments, the multilayer film is not an oriented film. In some embodiments, the multilayer film is a blown film. In other embodiments, the multilayer film is a cast film. In further embodiments, the multilayer film is a film label having athickness between 50 and 150 microns and a Tear Strength in the TD of less than 2.5 N.

[0017] The number of film layers of the multilayer film are not particularly limited, other than that the film has at least three layers, including a first skin layer, one or more core layers, and a second skin layer. The multilayer film can comprise 3, 4, 5, 6, 7, 8, 9, 10, 11 or more layers. The multilayer film can have different thicknesses. In some embodiments, the film is between 25 to 500 microns thick, or between 25 to 300 microns thick. In some embodiments, the films is less than 200 microns thick, less than 180 microns thick, less than 150 microns thick, less than 100 microns thick, or is between 25 to 150 microns thick, or between 50 to 150 microns thick, or between 75 to 150 microns thick, or between 50 and 100 microns thick. Thickness can be measured by methods known to those skilled in the art, including optical spectroscopy.

[0018] The multilayer film can have different layer thickness ratios or percents of thickness. In some embodiments, the multilayer film is a three layer film having a layer ratio of 10-20 / 60-80 / 10-20 (i.e., the skin layers are each 10-20 of the percent thickness of the film and the core layer is 60-80 of the percent thickness of the film). In some embodiments, the multilayer film is a five layer film having a layer ratio of 10-20 / 10-20 / 20-60 / 10-20 / 10-20 (i.e., the skin layers are each 10-20% of the film, the middle core layer is 20-60% of the film, and the other two core layers are 10-20% of the film such that the one or more core layer are 60-80% of the thickness of the film).

[0019] The multilayer film comprises high density polyethylene and low density polyethylene. The multilayer film comprises at least 25 wt.% high density polyethylene having a density of at least 0.965 g / cc, based on the total weight of the film. The first skin layer comprises at least 90 wt.% of a high density polyethylene having a density of at least 0.965 g / cc and the second skin layer comprises at least 90 wt.% of a high density polyethylene having a density of at least 0.965 g / cc. The high density polyethylene in the first and second skin layer can be the same type (e.g., same commercial grade name) or different or a blend as long as the high density polyethylene in each respective layer has a density of at least 0.965 g / cc and comprise at least 90 wt.% of each skin layer, based on the respective weight of the skin layer. The total amount of high density polyethylene having a density of at least 0.965 g / cc is at least 25 wt.% of the total weight of the film. In some embodiments, the high density polyethylene in the first and second skin layers has a melt index between 0.5 and 6.0 g / 10 min, or between 0.5 to 2.0 g / 10 min. In some embodiments, the high density polyethylene in the first skin layer and / or the second skin layer has a density of at least 0.965 g / cc and a density less than 0.970 g / cc.

[0020] The multilayer film comprises at least 40 wt.% low density polyethylene, based on the total weight of the film. The core layer comprises a low density polyethylene having a density of 0.915 to 0.930 g / cc and a melt index (12) of 1.0 to 10.0 g / 10 min. In embodiments where there is more than one core layer, core layers (e.g., a second core layer, a third core layer, etc.) may comprise the same type (e.g., same commercial grade name), different or a blend of the low density polyethylene that is present in the core layer.

[0021] In some embodiments, the film comprises 25 to 60 wt.% high density polyethylene having a density of at least 0.965 g / cc and 40 to 75 wt.% low density polyethylene having a density of 0.915 to 0.930 g / cc and a melt index of 1.0 to 10.0 g / 10 min, based on the total weight of the film. All ranges between 25 to 60 wt.% high density polyethylene and 40 to 75 wt.% low density polyethylene are disclosed herein. For instance, the film can comprise from 25, 30 ,35, 40, 45, 50, 55 to 60, 55, 50, 45, 40, 35, 30 wt.% high density polyethylene and from 40, 45, 50, 55, 60, 65, 70 to 75, 70, 65, 60, 55, 50, 45 wt.% low density polyethylene, based on the total weight of the film.

[0022] In some embodiments, the multilayer film comprises at least 95 wt.%, at least 96 wt.%, at least 97 wt.%, at least 98 wt.%, at least 99 wt.%, or at least 99.9 wt.% of high density polyethylene and low density polyethylene combined, based on the total weight of the film. For instance, the film in some embodiments can consist essentially of low density polyethylene having a density between 0.915 to 0.930 g / cc and a melt index of 1.0 to 10.0 g / 10 min and high density polyethylene having a density of at least 0.965 g / cc. In some embodiments, the film is void of polymers other than polyethylene or void of polymers other than high density polyethylene and low density polyethylene. In some embodiments, the film comprises at least 90 wt.%, or 95 wt.%, or 99 wt.% of polyethylene, based on the total weight of the film, or consists essentially of polyethylene. A film made of a single polymer type, like polyethylene, and without any or without a significant amount of other polymers or additives can be more easily recycled.

[0023] In some embodiments, the multilayer film has at least one of the following properties: a Tensile Strain in the TD of less than 80% or less than 75% or less than 50% or less than 25%; a Tensile Strain in the MD of less than 500% or less than 400% or less than 300% or less than 250%; a Tear Strength in the TD of less than 2.50 N or less than 2.00 N; and a Tear Strength in the MD of less than 1.50 N or less than 1.40 N or less than 1.00 N; a 2% Secant Modulus in the TD between 400 and 700 MPa; a 2% Secant Modulus in MD between 350 to 600 MPa. Without being bound by theory, the structure and content of the multilayer film with specific amounts of the particular high density polyethylene in the skin layers and specific amount and particular low density polyethylene makes the film suitable for use as an easy-tear label that can be recyclable and can deliver low elongation and desirable modulus.

[0024] The multilayer film according to some embodiments can have skin layers that each have a density of at least 0.965 g / cc, based on the total weight of the skin layers. For instance, the first skin layer can have a density of at least 0.965 g / cc, or at least 0.967 g / cc, or at least 0.968 g / cc, and the second skin layer can have a density of at least 0.965 g / cc, or at least 0.967 g / cc, or at least 0.968 g / cc.

[0025] In some embodiments, the one or more core layers consist of the core layer, a second core layer, and a third core layer, where the second core layer is positioned between the core layer and the third core layer, and the second core layer comprises at least 40 wt.% of the total film, based on the total weight of the film, and comprises at least 95 wt.% low density polyethylene. In such embodiments, the core layer and the third core layer can comprise at least 95 wt.% high density polyethylene having a density of at least 0.965 g / cc, based on the total weight of the first and third core layer. In other such embodiments, the core layer and the third core layer comprise at least 95 wt.% low density polyethylene.

[0026] A laminate is also disclosed herein. The laminate can comprise the multilayer film according to any of the embodiments disclosed above and a substrate, wherein the multilayer film is laminated to the substrate to form the laminate. The substrate can be a polyethylene film. The substrate can comprise a lamination layer that acts as a functional or bonding layer that is adhered to the multilayer film (described above) via, for example, an extruded web layer in forming the laminate. The lamination layer can assist or enable a high bonding strength of the extruded web layer to prevent delamination.

[0027] Laminates of the present invention, in various embodiments, can have several desirable properties. In some embodiments, the laminate has a thickness between 50 and 150 microns, or alternatively between 75 and 125 microns, or alternatively between 90 and 110 microns.

[0028] In some embodiments, a laminate can comprises at least 90 wt.% ethylene -based polymer, or at least 95 wt.% ethylene -based polymer, or at least 99 wt.% ethylene-based polymer, or at least 99.5 wt.% ethylene -based polymer, or at least 99.9 wt.% ethylene-based polymer, based on the overall weight of the laminate. In some embodiments, the laminate is free of a laminating adhesive (e.g., a solvent-based or waterborne laminating adhesive such as those adhesives commercially available from The Dow Chemical Company under the trade names MOR-FREE™ (solventless laminating adhesive based on polyurethane technologies), ADCOTE™ (solvent based laminating adhesives having two-component polyurethane systems), ROBOND™ (water-based adhesives having one- or two- component acrylic co-polymers)). As used herein, the term “laminating adhesive” refers to a liquid suspension or emulsion of a chemical substance (e.g., polyurethane or polyacrylate) to bond two surfaces which is applied using a conventional dry-laminator or solventless laminator coating equipment to coat a first substrate with the laminating adhesive, dried to form an adhesive layer, and brought into contact with pressure to a second substrate to form an immediate bond with subsequent curing to form a laminate.

[0029] Methods of Preparing Multilayer Films and Laminate

[0030] Multilayer films can be formed using techniques known to those of skill in the art based on the teachings herein. For example, layers can be coextruded as blown films or cast films using techniques known to those of skill in the art based on the teachings herein. In particular, based on the compositions of the different film layers disclosed herein, blown film manufacturing lines and cast film manufacturing lines can be configured to coextrude multilayer films of the present invention in a single extrusion step using techniques known to those of skill in the art based on the teachings herein.

[0031] In some embodiments, multilayer films may comprise a plurality of layers that are coextruded and then laminated to one or more additional layers. In such embodiments, a facial surface of the coextruded film can be laminated to a facial surface of another film layer using techniques known to those of skill in the art based on the teachings herein. For example, in one embodiment, a multilayer film of the present invention can be reverse-printed, and then laminated to another film (e.g., another polyethylene film).

[0032] Multilayer films of the present invention can be used to as a label to a package. Such packages can be formed from a polyethylene film. Examples of such packages can include flexible packages, pouches, stand-up pouches, and pre-made packages or pouches. In some embodiments, multilayer films of the present invention can be used as a label on a food package. Examples of food that can be included in such packages include meats, cheeses, cereal, nuts, juices, sauces, and others. Such packages can be formed using techniques known to those of skill in the art based on the teachings herein and based on the particular use for the package (e.g., type of food, amount of food, etc.).

[0033] Additives

[0034] The multilayer film or layers of the film may further comprise one or more additives. Additives are optionally included in the first skin layer, second skin layer, and / or one or more core layers. Additives are well within the skill in the art. Such additives include, for instance, stabilizers including free radical inhibitors and ultraviolet wave (UV) stabilizers, neutralizes, nucleating agents, slip agents, antiblock agents, pigments, antistatic agents, clarifiers, waxes, resins, fillers such as silica and carbon black and other additives within the skill in the art used in combination or alone. Effective amounts are known in the art and depend on parameters of the polymers in the composition and conditions to which they are exposed.

[0035] The invention includes, but is not limited to, the following aspects:

[0036] ASPECT 1 - A multilayer fdm comprising: a first skin layer, a second skin layer, and one or more core layers, wherein: the first skin layer comprises at least 90 wt.% of a high density polyethylene having a density of at least 0.965 g / cc, based on the weight of the first skin layer; the second skin layer comprises at least 90 wt.% of a high density polyethylene having a density of at least 0.965 g / cc, based on the total weight of the second skin layer; and a core layer comprising a low density polyethylene having a density of 0.915 to 0.930 g / cc and a melt index (12) of 1.0 to 10.0 g / 10 min, and wherein the film comprises at least 25 wt.% high density polyethylene having a density of at least 0.965 g / cc, and at least 40 wt.% low density polyethylene having a density of 0.915 to 0.930 g / cc and a melt index of 1.0 to 10.0 g / 10 min, based on the total weight of the film.

[0037] ASPECT 2 - The multilayer film of aspect 1, wherein the film comprises 25 to 60 wt.% high density polyethylene having a density of at least 0.965 g / cc and 40 to 75 wt.% low density polyethylene having a density of 0.915 to 0.930 g / cc and a melt index of 1.0 to 10.0 g / 10 min, based on the total weight of the film.

[0038] ASPECT 3 - The multilayer film of any previous aspect, wherein the film is less than 200 microns thick.

[0039] ASPECT 4 - The multilayer film of any previous aspect, wherein the film is not an oriented film.

[0040] ASPECT 5 - The multilayer film of any previous aspect, wherein the film comprises at least 95 wt.% of high density polyethylene and low density polyethylene combined, based on the total weight of the film.

[0041] ASPECT 6 - The multilayer film of any previous aspect, wherein the film has at least one of the following properties: a Tensile Strain in the TD of less than 80%; a Tensile Strain in the MD of less than 500%; a Tear Strength in the TD of less than 2.5 N; and a Tear Strength in the MD of less than 1.5 N.

[0042] ASPECT 7 - The multilayer film of any previous aspect, wherein the film is between 50 and 100 microns thick.

[0043] ASPECT 8 - The multilayer film of any previous aspect, wherein the first skin layer and the second skin layer have a density of at least 0.965 g / cc, based on the total weight of the skin layers.

[0044] ASPECT 9 - The multilayer film of any previous aspect, wherein the high density polyethylene in the first and second skin layers has a melt index between 0.5 and 6.0 g / 10 min. ASPECT 10 - The multilayer film of any previous aspect, wherein the one or more core layers consist of the core layer, a second core layer, and a third core layer, where the second core layer is positioned between the core layer and the third core layer, and the second core layer comprises at least 40 wt.% of the total film, based on the total weight of the film, and comprises at least 95 wt.% low density polyethylene.

[0045] ASPECT 11 - The multilayer film of aspect 10, wherein the core layer and the third core layer comprise at least 95 wt.% high density polyethylene having a density of at least 0.965 g / cc, based on the total weight of the first and third core layer.

[0046] ASPECT 12 - The multilayer film of aspect 10, wherein the core layer and the third core layer comprise at least 95 wt.% low density polyethylene.

[0047] ASPECT 13 - The multilayer film of any previous aspect, wherein the film consists essentially of high density polyethylene and low density polyethylene.

[0048] ASPECT 14 - The multilayer film of any previous aspect, wherein the film is a cast film.

[0049] ASPECT 15 - The multilayer film of any previous aspect, wherein the film is a blown film.

[0050] ASPECT 16 - A laminate comprising the multilayer film of any preceding claim and a substrate, wherein the multilayer film is laminated to the substrate

[0051] TEST METHODS

[0052] Density

[0053] Density is measured according to ASTM D792, Method B in reported in grams / cubic centimeter (g / cc or g / cm3).

[0054] Melt Index

[0055] Melt index (I2), or 12, is measured in accordance with ASTM D1238, Conditions 190 °C / 2.16 kg, Procedure B; and the 12 value is reported in grams eluted per 10 minutes (g / 10 min).

[0056] Tensile Strain %

[0057] Tensile strain, or % Elongation at break, is measured with Universal Testing Machine (UTM) in accordance with ASTM D882, Sample width of 25 mm, Test speed of 500 mm / min. Measurement is done in machine direction (MD) and transverse direction (TD) of film sample.

[0058] Tear Strength (N)

[0059] Tear strength, is measured with Elmendorf tear tester in accordance with ASTM DI 922, Test weight of 16 N. Measurement is done in machine direction (MD) and transverse direction (TD) of film sample. 2% Secant Modulus (MPa)

[0060] Secant modulus, is measured with Universal Testing Machine (UTM) in accordance with ASTM D882, Sample width of 25 mm, Test speed of 25 mm / min. Modulus value was collected at 2% strain. Measurement is done in machine direction (MD) and transverse direction (TD) of fdm sample EXAMPLES

[0061] The below polymers in Table 1 are used in the examples. All of the polymers are commercially available from The Dow Chemical Company. ELITE1'1AT 6900 is a high density polyethylene in accordance with the embodiments disclosed above. LDPE 450E is a low density polyethylene in accordance with the embodiments disclosed above. Table 1: Raw Materials

[0062] Inventive and Comparative Films are fabricated using blown fdm line equipped with pancake die (make- Labtech, Thailand). Fabrication parameters are included in Table 2. Table 2: Blown Film Conditions

[0063] Table 3: Films with Layer

[0064] Table 4: Properties of Films

Claims

AMENDED CLAIMS received by the International Bureau on 15 Jan. 2026(15.01.2026)We claim:

1. A multilayer film comprising: a first skin layer, a second skin layer, and one or more core layers, wherein: the first skin layer comprises at least 90 wt.% of a high density polyethylene having a density of at least 0.965 g / cc, based on the weight of the first skin layer; the second skin layer comprises at least 90 wt.% of a high density polyethylene having a density of at least 0.965 g / cc, based on the total weight of the second skin layer; and a core layer comprising a low density polyethylene having a density of 0.915 to 0.930 g / cc and a melt index (12) of 1.0 to 10.0 g / 10 min, and wherein the film comprises at least 25 wt.% high density polyethylene having a density of at least 0.965 g / cc, and at least 40 wt.% low density polyethylene having a density of 0.915 to 0.930 g / cc and a melt index of 1.0 to 10.0 g / 10 min, based on the total weight of the film; wherein the film is less than 100 microns thick and each of the skin layers is less than 15% of the thickness of the film.

2. The multilayer film of claim 1, wherein the film comprises 25 to 60 wt.% high density polyethylene having a density of at least 0.965 g / cc and 40 to 75 wt.% low density polyethylene having a density of 0.915 to 0.930 g / cc and a melt index of 1.0 to 10.0 g / 10 min, based on the total weight of the film.

3. The multilayer film of any preceding claim, wherein the film is less than 80 microns thick.

4. The multilayer film of any preceding claim, wherein the film is not an oriented film.

5. The multilayer film of any preceding claim, wherein the film comprises at least 95 wt.% of high density polyethylene and low density polyethylene combined, based on the total weight of the film.

6. The multilayer film of any preceding claim, wherein the film has at least one of the following properties: a Tensile Strain in the TD of less than 80%; a Tensile Strain in the MD of less than 500%; a Tear Strength in the TD of less than 2.5 N; and a Tear Strength in the MD of less than 1.5 N.

7. The multilayer film of any preceding claim, wherein the film is between 50 and 80 microns thick.

8. The multilayer film of any preceding claim, wherein the first skin layer and the second skin layer have a density of at least 0.965 g / cc, based on the total weight of the skin layers.

9. The multilayer film of any preceding claim, wherein the high density polyethylene in the first and second skin layers has a melt index (12) between 0.5 and 6.0 g / 10 min.

10. The multilayer film of any preceding claim, wherein the one or more core layers consist of the core layer, a second core layer, and a third core layer, where the second core layer is positioned between the core layer and the third core layer, and the second core layer comprises at least 40 wt.% of the total film, based on the total weight of the film, and comprises at least 95 wt.% low density polyethylene.

11. The multilayer film of claim 10, wherein the core layer and the third core layer comprise at least 95 wt.% high density polyethylene having a density of at least 0.965 g / cc, based on the total weight of the first and third core layer.

12. The multilayer film of claim 10, wherein the core layer and the third core layer comprise at least 95 wt.% low density polyethylene.

13. The multilayer film of any preceding claim, wherein the film consists essentially of high density polyethylene and low density polyethylene.

14. The multilayer film of any preceding claim, wherein the film is a cast film.

15. The multilayer film of any one of claims 1 to 12, wherein the film is a blown film.

16. A laminate comprising the multilayer film of any preceding claim and a substrate, wherein the multilayer film is laminated to the substrate.

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