High barrier blown film polyolefin solutions for barrier coating

Abstract

The present invention relates to a polyolefin sealant film comprising an outer layer made of an outer layer composition comprising a propylene polymer component AO, wherein the xylene solubles (XS) content of the outer layer composition is below 3.5 wt% as measured according to ISO 16152.

Description

[0001] This invention generally relates to a polyolefin sealant film comprising an outer layer for barrier coating, a laminated polyolefin film comprising the sealant film, articles comprising the laminated polyolefin film, and the use of the laminated polyolefin film in the production of articles (preferably packaging articles). In particular, this invention relates to a polyolefin sealant film comprising an outer layer of a propylene polymer.

[0002] Laminated structures are widely used in the packaging industry, with typical 2- to 5-layer laminates commonly used in various packaging applications. Due to the excellent sealing properties of polyethylene, polyethylene (PE) films are used as the sealant film / layer in most of these applications. These PE films are then laminated with other substrates to provide stiffness or other desired properties, such as barrier properties and optical properties (gloss and transparency).

[0003] High-barrier blown polyethylene films, including ethylene-vinyl alcohol copolymers (EVOH) or polyamides such as nylon, are commonly used as barrier layers. However, these films are not easily recycled. To meet the current trend of providing recyclable materials for sustainable packaging, solutions with improved barrier properties, alternatives to polyethylene or polyolefins, are gaining significant attention.

[0004] Polypropylene-based resins are widely used in food packaging due to their excellent tensile strength, rigidity, transparency, and the advantages of being non-toxic and odorless. They are typically used in the form of cast film (CPP), biaxially oriented film (BOPP), or water-quenched tubular film (TQPP). However, the poor melt strength of polypropylene-based resins has made their use in vertical blown film production lines a challenge; therefore, the range of polypropylene resins suitable for conventional blown film packaging applications is very limited.

[0005] The purpose of this invention is to provide a polyolefin film characterized by sufficient film stiffness and good optical and barrier properties, suitable for sustainable packaging applications, and preferably produced by a vertically upward blown film process.

[0006] The present invention is based on the discovery that such a film can be obtained as a polyolefin film having an outer layer for barrier coating, wherein the outer layer is made of a composition comprising a propylene polymer and having a relatively low xylene soluble (XS) content.

[0007] Therefore, the present invention provides a polyolefin sealant film comprising an outer layer made of an outer layer composition comprising a propylene polymer component AO, wherein the xylene soluble (XS) content of the outer layer composition is less than 3.5 wt% as determined according to ISO 16152.

[0008] The polyolefin sealant film of this invention is theoretically well-suited for barrier coating on its outer layer because this layer has a clean film surface, is free of surface defects, and has a low contact angle. After coating, the film exhibits excellent barrier properties in terms of moisture resistance (WVTR) and oxygen resistance (OTR).

[0009] Furthermore, polyolefin sealant films exhibit excellent barrier coating bond strength, meaning the coating adheres very well to the outer layer, with high surface energy retention and minimal surface energy decay. Moreover, the rigidity of polyethylene sealant films allows for efficient processing.

[0010] "Polyolefin (sealant) film" refers to a film comprising or composed of at least one type of olefin polymer, which may be a homopolymer or a copolymer. Based on the total weight of the polyolefin film, the polyolefin film comprises preferably at least 90 wt%, more preferably at least 95 wt%, and most preferably at least 98 wt% of at least one type of olefin polymer. Based on the total weight of the polyolefin film, the polyolefin film comprises preferably 90-100 wt%, more preferably 95-100 wt%, and most preferably 98-100 wt% of at least one type of olefin polymer. Most preferably, the polyolefin film is composed of at least one type of olefin polymer. Preferably, the olefin polymer comprises or is composed of a polymer that is a polymer of ethylene, propylene, and / or any α-olefin containing 4-10 carbon atoms, which may be a homopolymer or a copolymer. Preferably, the polyolefin film does not contain non-polyolefin polymers.

[0011] Based on the total weight of the polyolefin film, the polyolefin film comprises preferably at least 80 wt%, more preferably at least 85 wt%, and at most 90 wt% of at least one ethylene polymer, which includes homopolymers and copolymers of ethylene. Preferably, based on the total weight of the polyethylene film, the polyolefin film comprises at most 95% of at least one ethylene polymer, which includes homopolymers and copolymers of ethylene.

[0012] As understood within the meaning of this disclosure, the polyolefin film and its layers, and the compositions used to prepare the layers, may further include additives, stabilizers, processing aids, and / or pigments. Examples of such compounds include antioxidants, UV stabilizers, acid scavengers, nucleating agents, anti-blocking agents, slip agents, and polymer processing aids (PPA). These compounds may be present in the same or different amounts in some layers of the polyethylene film or in only one layer. Typically, the content of the above compounds is 0 to 5 wt%, based on the weight of the compositions used to prepare the layers of the film or the weight of the layers of the film.

[0013] The above definition and implementation of polyolefin films apply to all films disclosed herein, including sealant films, substrate films and laminated films.

[0014] Unless otherwise stated, percentages (%) should be understood as weight percentages (wt%) within the meaning of this disclosure.

[0015] It should also be understood within the meaning of this disclosure that the embodiments described below can be combined.

[0016] "Sealant film" refers to a film including a sealing layer, which is a layer that promotes adhesion to another film or layer. Preferably, the sealant film has an outer layer, a core layer, and an inner layer, and optionally at least one sub-skin layer. Preferably, the inner layer is the sealing layer.

[0017] outer layer

[0018] The outer layer of the sealant film of the present invention is one of the external layers of the film and is suitable for coating, such as barrier coating. It is made of an outer layer composition, which preferably includes one or more polyolefin components, but at least includes a propylene polymer component AO.

[0019] As measured according to the description below, the xylene-soluble content of the outer layer composition is less than 3.5 wt%, preferably 3.0 wt% or less, more preferably 2.5 wt% or less, even more preferably 2.0 wt% or less, and most preferably 1.5 wt% or less. Typically, the xylene-soluble content of the outer layer composition is 0.3 wt% or more.

[0020] The outer layer composition comprises a propylene polymer component AO. As measured according to the description below, the xylene-soluble content of component AO in the outer layer composition is preferably less than 3.5 wt%, preferably 3.0 wt% or less, more preferably 2.5 wt% or less, even more preferably 2.0 wt% or less, and most preferably 1.5 wt% or less. Typically, the xylene-soluble content of component AO in the outer layer composition is 0.2 wt% or more.

[0021] The density of component AO is preferably 890–920 kg / m³. 3 More preferably, it is 895–910 kg / m³. 3 The optimal value is 900–910 kg / m³. 3 .

[0022] The MFR2 of component AO is preferably 1.0–5.0 g / 10 min, more preferably 2.0–4.0 g / 10 min, and most preferably 3.0–3.5 g / 10 min.

[0023] The melting point of component AO is preferably 155–175°C, more preferably 160–170°C, and most preferably 161–168°C.

[0024] The MWD of component AO (defined as M w / M n Preferably, the content is at least 5, more preferably at least 5.5. The MWD of component AO is preferably 5.0 to 10.0, more preferably 5.5 to 9.0, and most preferably 6.0 to 8.0.

[0025] All molecular weight parameters of the propylene polymer were determined using standard GPC methods, which will be described in further detail below.

[0026] In one embodiment, the component AO has an MFR2 of 3.0–3.5 g / 10 min, a melting point of 160–170 °C, and / or a MWD of 5.5–9.

[0027] The outer layer composition component AO is a propylene polymer.

[0028] In one embodiment, component AO of the outer layer composition is a propylene homopolymer.

[0029] Based on the total weight of the propylene polymer, "propylene homopolymer" refers to a propylene polymer composed of at least 99.5 wt%, preferably at least 99.6 wt%, and more preferably at least 99.8 wt% propylene units. In one embodiment, only propylene units are detected in the propylene homopolymer.

[0030] Preferably, the propylene homopolymer has high crystallinity. Preferably, the propylene homopolymer is a (highly) isotactic propylene homopolymer, that is, its isotactic pentad fraction (mm) is... 13 The content (determined by C-NMR spectroscopy) is 95-98%, preferably 95.5-98%, and more preferably 96-97.5%. The isotactic fraction content (mm) is as disclosed in WO2013 / 004781. 13 The high crystallinity of the film was measured by C-NMR spectroscopy. High crystallinity has a positive impact on the tensile properties and tensile modulus of the film.

[0031] Preferably, the propylene homopolymer is a crystalline propylene polymer. "Crystallized" indicates that the propylene homopolymer has a high melting point. The melting point of the propylene homopolymer is preferably 160–170°C, more preferably 161–168°C.

[0032] In one embodiment, the propylene homopolymer has a crystallization temperature of at least 110°C, preferably at least 112°C, as measured by differential scanning calorimetry (DSC). The crystallization temperature of the propylene homopolymer is preferably 110–120°C, more preferably 111–118°C, and most preferably 112–117°C. A method for determining the crystallization temperature is described in WO2013 / 004781.

[0033] Preferably, the propylene homopolymer has a relatively high polydispersity index. In one embodiment, the polydispersity index of the propylene homopolymer is at least 5.0, preferably 5.0 to 9.0, more preferably 5.0 to 8.0, and most preferably 5.0 to 7.0. The method for determining the polydispersity index is described in WO2018 / 077838.

[0034] Preferably, the propylene homopolymer has fewer regional defects. Therefore, according to the disclosure in WO2018 / 077838... 13 C-NMR spectroscopy revealed that, preferably, the propylene homopolymer has less than 1.0 mol%, more preferably less than 0.5 mol%, and even more preferably less than 0.3 mol% of 2,1-erythro regio-defects. In one particular embodiment, no 2,1-erythro regio-defects were detected.

[0035] In one embodiment, the MFR2 of the propylene homopolymer is 3.0–3.5 g / 10 min, the melting point is 160–170 °C, and / or the MWD is 5.5–9.

[0036] In one embodiment, the propylene homopolymer has a high purity, i.e., based on the total weight of the propylene homopolymer, its ash content does not exceed 30 ppm, preferably not more than 20 ppm, and more preferably not more than 15 ppm. The method for determining the ash content is described in WO2013 / 004781.

[0037] The propylene homopolymers described above have been disclosed, for example, in WO2013 / 004781. This also discloses methods for measuring the aforementioned parameters of the propylene homopolymers, and methods for preparing the propylene homopolymers that can be used in this invention.

[0038] Borealis's HC320BF product can be used as the propylene polymer component AO.

[0039] The content of component AO in the outer layer composition of the sealant film is preferably 90-100 wt%, more preferably 95-100 wt%, and most preferably 98-100 wt%. Preferably, the outer layer composition consists of component AO.

[0040] The outer layer composition of the sealant film preferably contains only a polyolefin component, and more preferably only a propylene polymer component.

[0041] Preferably, in the sealant film of the present invention, the outer layer accounts for 5 to 20% of the total thickness of the sealant film, more preferably 7 to 15%.

[0042] The outer layer of the sealant film is preferably used for the barrier coating as described below.

[0043] In a preferred embodiment, the sealant film includes a barrier coating on the outer layer, wherein the barrier coating preferably includes a barrier coating component selected from metals Al, Au, Ag, Cr, Zn, Ti, Si, Cu and oxides of these metals, as well as mixtures thereof.

[0044] Core layer

[0045] The sealant film of the present invention typically includes a core layer, which is not an outer layer of the film but exists as an intermediate layer between the outer and inner layers of the film, directly adjacent to one or two of these layers or, in the presence of a subsurface layer. It may be directly adjacent to the outer layer or have a layer in between. The core layer is made of a core layer composition, which preferably includes one or more polyolefin components, more preferably a polyethylene component.

[0046] In a preferred embodiment, the sealant film comprises a core layer made of a core layer composition comprising or composed of the following components: a linear low-density polyethylene (LLDPE) component, and / or a catalytically produced polyethylene component (BC), and / or a high-pressure produced low-density polyethylene (LDPE) component (CC); the linear low-density polyethylene (LLDPE) component is preferably a multimodal copolymer component (AC); the catalytically produced polyethylene component (BC) is an ethylene copolymer, preferably an ethylene terpolymer (II), with a melt flow rate (MFR5) of 0.6–4 g / 10 min as measured according to ISO 1133.

[0047] Component AC

[0048] In one embodiment of the core layer composition, the core layer comprises or is composed of linear low-density polyethylene (LLDPE) component AC. Linear low-density polyethylene is well known in the art and can be produced in a polymerization process using a catalyst.

[0049] Preferably, the linear low-density polyethylene component AC is an ethylene copolymer, more preferably a multimodal ethylene copolymer, and preferably, its density is 910–925 kg / m³. 3 And / or MFR2 is 0.5–5.0 g / 10 min.

[0050] Preferably, the MFR of the ethylene copolymer of component AC 21 The ratio of / MFR2 is 13 to 30, and the MWD is 6 or less.

[0051] Preferably, the ethylene copolymer comprises a multimodal polymer of ethylene and one or more comonomers, or is composed of a multimodal polymer of ethylene and one or more comonomers; the comonomer is selected from α-olefins containing 4 to 10 carbon atoms; the MFR of the ethylene copolymer is... 21 The ratio of / MFR2 is 13 to 30, and the MWD is 6 or less.

[0052] Such multimodal ethylene copolymers have been disclosed, for example, in WO2016 / 083208.

[0053] The MFR2 of the multimodal ethylene copolymer is preferably 0.6–2.5 g / 10 min, and particularly preferably 1.2–1.8 g / 10 min.

[0054] Preferably, the density of the multimodal ethylene copolymer is 910–925 kg / m³. 3 More preferably, it is 913–922 kg / m³. 3 The preferred value is 915–920 kg / m³. 3 .

[0055] MFR of multimodal ethylene copolymers 21 The ratio of / MFR2 is preferably 13 to 30, more preferably 15 to 25.

[0056] The MWD of the multimodal ethylene copolymer is preferably 6 or less, usually greater than 1, and more preferably 3 to 5.

[0057] The α-olefin comonomer containing 4 to 10 carbon atoms in the multi-peak ethylene copolymer is preferably 1-butene and / or 1-hexene.

[0058] Preferably, the total amount of comonomers present in the multimodal ethylene copolymer is 0.5-10 mol%, more preferably 1-8 mol%, more preferably 1-5 mol%, even more preferably 1.5-5 mol%, and most preferably 2.5-4 mol%.

[0059] In a particular preferred embodiment, the multimodal ethylene copolymer is a bimodal copolymer, i.e., it comprises a low molecular weight component and a high molecular weight component, with MFR2 at 1.2–1.8 g / 10 min and / or MFR5 at 3.0–5.0 g / 10 min, and / or MFR 21 It is 20–40 g / 10 min, and / or has a density of 915–920 kg / m³. 3 and / or molecular weight distribution (MWD) of 3–5, and / or Mn It is 15–25 kg / mol, and / or M w It is 80–115 kg / mol, and / or MFR 21 / MFR2 ratio (FRR) 21 / 2 ) is 15–25, and / or MFR 21 / MFR5 ratio (FRR) 21 / 5 The range is 6 to 9.

[0060] In another preferred embodiment, the ethylene copolymer of component AC includes or is composed of ethylene terpolymers, more preferably multimodal ethylene terpolymers (I).

[0061] Preferably, the multi-peaked ethylene terpolymer (I) has a density of 910–925 kg / m³. 3 MFR2 is an ethylene terpolymer with a strength of 0.5–2.0 g / 10 min.

[0062] The multimodal ethylene terpolymer (I) is preferably a multimodal polymer comprising ethylene and at least two different comonomers, or composed of such a multimodal polymer; the comonomers are selected from α-olefins containing 4 to 10 carbon atoms, and the MFR of the multimodal polymer is... 21 The ratio of / MFR2 is 13 to 30, and the MWD is 5 or less.

[0063] Such multi-peaked ethylene terpolymers have been disclosed, for example, in WO2016 / 083208. For definitions of these ethylene terpolymers (e.g., the “peaks” of the polymer) and methods of production, refer to WO2016 / 083208. Furthermore, whether explicitly stated herein or not, the densities described in WO2016 / 083208 are in the range of 910–925 kg / m³. 3 All embodiments and preferred embodiments of this ethylene terpolymer within the scope are also preferred embodiments of the multimodal ethylene terpolymer (I) in this disclosure.

[0064] The MFR2 of the multimodal ethylene terpolymer (I) is preferably 0.6 to 2.5 g / 10 min, and particularly preferably 1.2 to 1.8 g / 10 min.

[0065] The density of the multi-peaked ethylene terpolymer (I) is preferably 910–925 kg / m³. 3 More preferably, it is 913–922 kg / m³. 3 The preferred value is 915–920 kg / m³. 3 .

[0066] MFR of multimodal ethylene terpolymer (I) 21 The ratio of / MFR2 is preferably 13 to 30, more preferably 15 to 25.

[0067] The multi-peak ethylene terpolymer (I) preferably contains at least two α-olefin comonomers with 4 to 10 carbon atoms, namely 1-butene and 1-hexene.

[0068] The total amount of comonomers present in the multimodal ethylene terpolymer (I) is preferably 0.5-10 mol%, more preferably 1-8 mol%, even more preferably 1-5 mol%, further preferably 1.5-5 mol%, and most preferably 2.5-4 mol%.

[0069] The multi-peak ethylene ternary polymer (I) is preferably a bi-peak ternary polymer, and is preferably composed of or consisting of an ethylene polymer component (A) and an ethylene polymer component (B), wherein the MFR2 of the ethylene polymer component (A) is higher than the MFR2 of the ethylene polymer component (B).

[0070] Preferably, the MFR2 of the ethylene polymer component (A) is 1-50 g / 10 min, more preferably 1-40 g / 10 min, even more preferably 1-30 g / 10 min, further preferably 2-20 g / 10 min, even more preferably 2-15 g / 10 min, and most preferably 2-10 g / 10 min.

[0071] The ratio of the MFR2 of ethylene polymer component (A) to the MFR2 of ethylene polymer component (B) is 2 to 50, preferably 5 to 40, more preferably 10 to 30, even more preferably 10 to 25, and most preferably 11 to 25.

[0072] Preferably, the ethylene polymer component (A) includes comonomers that are different from those in the ethylene polymer (B).

[0073] Preferably, the ethylene polymer component (A) has a lower comonomer content (mol%) than the ethylene polymer component (B). More preferably, the ratio of [the amount (mol%) of α-olefin comonomers containing 4 to 10 carbon atoms present in the ethylene polymer component (A)] to [the amount (mol%) of at least two α-olefin comonomers containing 4 to 10 carbon atoms in the final multi-peak ethylene terpolymer] is 0.10 to 0.60, preferably 0.15 to 0.50.

[0074] Preferably, the α-olefin comonomer containing 4 to 10 carbon atoms in the ethylene polymer component (A) is 1-butene, and the α-olefin comonomer containing 4 to 10 carbon atoms in the ethylene polymer component (B) is 1-hexene.

[0075] Preferably, the density of ethylene polymer component (A) is different from that of ethylene polymer component (B), and is preferably higher than that of ethylene polymer component (B).

[0076] The density of the ethylene polymer component (A) is preferably 925–950 kg / m³. 3 More preferably, it is 930–945 kg / m³. 3 .

[0077] Preferably, the multimodal ethylene ternary polymer (I) comprises an ethylene polymer component (A) and an ethylene polymer component (B); based on the total amount (100 wt%) of the multimodal ethylene ternary polymer (I), the content of ethylene polymer component (A) is 30-70 wt%, more preferably 40-60 wt%, even more preferably 35-50 wt%, and even more preferably 40-50 wt%; the content of ethylene polymer component (B) is 30-70 wt%, more preferably 40-60 wt%, even more preferably 50-65 wt%, and even more preferably 50-60 wt%.

[0078] Most preferably, the multimodal ethylene terpolymer (I) consists of ethylene polymer components (A) and (B) as the only polymer components. Accordingly, the distribution between ethylene polymer components (A) and (B) is (30-70):(70-30), preferably (40-60):(60-40), more preferably (35-50):(65-50), and even more preferably (40-50):(50-60).

[0079] In a particular preferred embodiment, the multimodal ethylene ternary polymer (I) is a bimodal ternary polymer, i.e., comprising a low molecular weight component and a high molecular weight component, having an MFR2 of 1.2–1.8 g / 10 min and / or an MFR5 of 3.0–5.0 g / 10 min and / or an MFR 21 It is 20–40 g / 10 min, and / or has a density of 915–920 kg / m³. 3 And / or molecular weight distribution (MWD) of 3.0–5.0, and / or M n It is 15–25 kg / mol, and / or M w It is 80–115 kg / mol, and / or MFR 21 / MFR2 ratio (FRR) 21 / 2 ) is 15–25, and / or MFR 21 / MFR5 ratio (FRR) 21 / 5 The range is 6 to 9.

[0080] Preferably, the multimodal ethylene terpolymer (I) can also be a commercially available product with the properties required herein, such as Borealis or Borouge's Anteo. TM Especially Anteo TM FK1828 or Anteo TM FK1820.

[0081] The content of component AC in the core layer composition is preferably 10-80 wt%, more preferably 25-70 wt%, even more preferably 40-65 wt%, and most preferably 50-60 wt%.

[0082] Component BC

[0083] In a further embodiment of the core layer composition, the core layer comprises or is composed of a catalytically produced polyethylene component (BC), which is an ethylene copolymer, preferably an ethylene terpolymer (II), and has a melt flow rate (MFR5) of 0.6 to 4 g / 10 min.

[0084] "Catalytically produced" polyethylene refers to polyethylene produced in a process using a catalyst, such as a Ziegler-Natta catalyst or a metallocene catalyst, preferably polyethylene produced in a process using a metallocene catalyst.

[0085] In contrast, "high-pressure produced" polyethylene refers to polyethylene produced in a high-pressure process, where the pressure used is significantly higher than in catalytic processes used for polyethylene production, and the polymerization is based on a free radical mechanism. These processes are typically carried out in autoclaves or tubular reactors. Polyethylene produced in this high-pressure process is generally a low-density ethylene homopolymer (LDPE), which usually contains long-chain branches.

[0086] Preferably, the density of the ethylene copolymer component BC is 920–940 kg / cm³. 3 And / or MFR2 is 0.1–2 g / 10 min.

[0087] Preferably, the ternary polymer (II) comprises or is composed of the following components:

[0088] a) Low molecular weight polymers, which are ethylene and C4-C6 polymers. 12 α-olefin binary copolymers; and

[0089] b) High molecular weight polymers, if the low molecular weight polymers in a) are ethylene and C6-C6 polymers. 12 The high molecular weight polymer is a binary copolymer of α-olefins, wherein the high molecular weight polymer is a binary copolymer of ethylene and 1-butene; otherwise, the high molecular weight polymer is ethylene, 1-butene, and C6-C6. 12Ternary polymers of α-olefins.

[0090] For example, such bimodal ethylene terpolymers are disclosed in WO03 / 066698. For definitions of these ethylene terpolymers (e.g., the "peaks" of the polymer) and methods of production, refer to WO03 / 066698. Furthermore, whether explicitly stated herein or not, the densities described in WO03 / 066698 are in the range of 928–940 kg / m³. 3 All embodiments and preferred embodiments of this ethylene terpolymer within the scope are also preferred embodiments of the multimodal ethylene terpolymer (II) of this disclosure.

[0091] The density of the ternary polymer (II) is preferably 928–940 kg / m³. 3 More preferably, it is 930–939 kg / m³. 3 .

[0092] Preferably, the low molecular weight copolymer fraction has C4 to C5 ppm. 12 The α-olefins are selected from 1-butene, 1-hexene, 4-methyl-1-pentene, 1-octene, and 1-decene.

[0093] Furthermore, preferably, the high molecular weight copolymer fraction has C6 to C6 64 ... 12 The α-olefin is preferably selected from 1-hexene, 4-methyl-1-pentene, 1-octene, and 1-decene.

[0094] Preferably, the ternary polymer (II) comprises a) a low molecular weight homopolymer of ethylene and b) ethylene, 1-butene, and C6-C6 polymers. 12 High molecular weight ternary polymers of α-olefins, or composed of a) low molecular weight homopolymers of ethylene and b) ethylene, 1-butene, and C6-C6 olefins. 12 It is composed of a high molecular weight ternary polymer of α-olefins; the high molecular weight ternary polymer is preferably a high molecular weight ternary polymer of ethylene, 1-butene and 1-hexene.

[0095] The weight-average molecular weight of the ternary polymer (II) is preferably 190,000 to 400,000 g / mol, more preferably 200,000 to 300,000 g / mol. The weight-average molecular weight of the low molecular weight polymer fraction is preferably 4,500 to 55,000 g / mol, more preferably 5,000 to 50,000 g / mol, and the weight-average molecular weight of the high molecular weight polymer is preferably 450,000 to 1,000,000 g / mol, more preferably 500,000 to 1,000,000 g / mol.

[0096] The melt flow rate (MFR2) of the ternary polymer (II) is preferably 0.1 to 2 g / 10 min, more preferably 0.5 to 1.3 g / 10 min.

[0097] The melt flow rate (MFR5) of the ternary polymer (II) is preferably 0.6 to 4 g / 10 min, more preferably 0.7 to 3 g / 10 min.

[0098] Melt Flow Rate (MFR) of Ternary Polymer (II) 21 The preferred concentration is 10–50 g / 10 min, and more preferably 15–45 g / 10 min.

[0099] The melt flow rate (MFR2) of the low molecular weight polymer fraction of the ternary polymer (II) is preferably 200–800 g / 10 min, more preferably 300–600 g / 10 min.

[0100] The ternary polymer (II) preferably comprises 30-60 wt%, more preferably 35-50 wt%, and most preferably 38-45 wt% of a low molecular weight polymer fraction, and the remaining components are preferably high molecular weight polymer fractions.

[0101] The total content of copolymer monomers in all polymers is preferably 1-7 mol%, more preferably 2-6 mol%.

[0102] The content of comonomers in the low molecular weight polymer is preferably 0–2.5 mol%, more preferably 0–2 mol%. The content of monomers in the high molecular weight polymer is preferably 2.5–11 mol%, more preferably 3–10 mol%.

[0103] In some embodiments, the ternary polymer (II) comprises a) a low molecular weight homopolymer of ethylene and b) a high molecular weight ternary polymer of ethylene, 1-butene and 1-hexene, or is composed of a) a low molecular weight homopolymer of ethylene and b) a high molecular weight ternary polymer of ethylene, 1-butene and 1-hexene; preferably, the content of 1-butene in the final polymer is 1.0 to 2.0 wt%, and the content of 1-hexene is 4.0 to 6.0 wt%.

[0104] The viscosity η of the ternary polymer (II) measured at 0.05 rad / s is preferably 10,000 to 65,000 Pa·s, more preferably 15,000 to 60,000 Pa·s, and most preferably 20,000 to 55,000 Pa·s.

[0105] Preferably, the multimodal ethylene terpolymer (II) can also be the commercially available product BorShape. TM For example, Borealis' BorShape TMFX1001 and BorShape TM FX1002.

[0106] FX1001 is a bimodal LLDPE terpolymer. The low molecular weight fraction is preferably an ethylene homopolymer with an MFR2 of 400 g / 10 min, produced in a loop reactor. The high molecular weight fraction, preferably produced in a gas-phase reactor, involves copolymerization of ethylene with comonomers 1-butene and 1-hexene. The final resin density is 931 kg / m³. 3 MFR5 was 0.85 g / 10 min. The distribution (LMW / HMW) was 39 / 61. The MFR5 of FX1001... w / M n Approximately 14 (from 13 to 15). The final polymer contains 1.5 wt% 1-butene and 5.5 wt% 1-hexene. The viscosity η, measured at 0.05 rad / s, is 52000 (±5000) Pa·s.

[0107] FX1002 is a bimodal MDPE terpolymer. The low molecular weight fraction is preferably an ethylene homopolymer with an MFR2 of 400 g / 10 min, produced in a loop reactor. The high molecular weight fraction, preferably produced in a gas-phase reactor, involves copolymerization of ethylene with comonomers 1-butene and 1-hexene. The final resin density is 937 kg / m³. 3 MFR5 is 2g / 10min, MFR 21 The yield was 42g / 10min. The distribution (LMW / HMW) was 43 / 57. The M of FX1002 w / M n Approximately 12 (from 11 to 13). The final polymer contains 1.5 wt% 1-butene and 4.5 wt% 1-hexene. The viscosity η, measured at 0.05 rad / s, is 23000 (±3000) Pa·s.

[0108] The content of component BC in the core layer composition is preferably 5-75 wt%, more preferably 15-65 wt%, even more preferably 30-60 wt%, and most preferably 35-55 wt%.

[0109] Component CC

[0110] In a further embodiment of the core layer composition, the core layer comprises or is composed of a low-density polyethylene (LDPE) component (CC) produced under high pressure. LDPE is well known in the art and is typically produced by a high-pressure process in a tubular reactor or autoclave.

[0111] For information on LDPE and its production, see, for example, the description on page 9, line 29 to page 12, line 6 of WO2017 / 055174.

[0112] Preferably, the density of the LDPE component CC is 910–930 kg / cm³. 3 And / or MFR2 is 0.1–2.5 g / 10 min.

[0113] The density of the LDPE component CC is preferably 918–928 kg / m³. 3 More preferably, it is 919–927 kg / m³. 3 The optimal value is 920–925 kg / m³. 3 .

[0114] The MFR2 of the LDPE component CC is preferably 0.3–1.7 g / 10 min, more preferably 0.4–1.5 g / 10 min, and most preferably 0.5–1.0 g / 10 min.

[0115] In a particularly preferred embodiment, the MFR2 of the LDPE component CC is 0.5–1.0, and / or the density is 920–925 kg / m³. 3 and / or MWD is 5-8, and / or M n It is 12–18 kg / mol, and / or M w It ranges from 85 to 130 kg / mol.

[0116] All molecular weight parameters of LDPE were measured using the GPC viscosity method, which will be described in further detail below.

[0117] Borealis' FT5230 resin can be used as the LDPE component CC.

[0118] The content of component CC in the core layer composition is preferably 5-40 wt%, more preferably 5-35 wt%, even more preferably 10-30 wt%, and most preferably 15-25 wt%.

[0119] In one embodiment, the core layer composition comprises, or preferably comprises, components AC and BC.

[0120] Preferably, all components of the core layer composition comprise ethylene polymers, or are preferably composed of ethylene polymers, including ethylene homopolymers and ethylene copolymers.

[0121] Preferably, in the sealant film of the present invention, the core layer accounts for 35-65% of the total thickness of the sealant film, more preferably 40-60%, and most preferably 45-55%.

[0122] Inner layer

[0123] The sealant film of the present invention typically also includes an inner layer, which is an outer layer of the sealant film opposite to the outer layer. Preferably, the inner layer is a sealing layer, that is, a layer that seals with another film or layer.

[0124] The inner layer is made of an inner layer composition, which preferably includes one or more polyolefin components, more preferably including a polyethylene component.

[0125] Preferably, the inner layer composition forming the inner layer includes component AI, which is an ethylene copolymer.

[0126] Preferably, the ethylene copolymer component AI includes any embodiment of the component AC described above, or is composed of any embodiment of the component AC described above.

[0127] The content of component AI in the inner layer composition is preferably 50-95 wt%, more preferably 60-90 wt%, and most preferably 70-85 wt%.

[0128] In addition, the inner layer composition preferably includes component BI, which is LDPE produced under high pressure.

[0129] Preferably, the LDPE component BI includes any embodiment of the component CC described above, or is composed of any embodiment of the component CC described above.

[0130] The content of component BI in the inner layer composition is preferably 5 to 40 wt%, more preferably 10 to 35 wt%, and most preferably 15 to 30 wt%.

[0131] Preferably, the inner layer comprises components AI and BI in a weight ratio of 60:40 to 95:5, more preferably 70:30 to 90:10, and most preferably 75:25 to 85:15, or is composed of components AI and BI in the above weight ratio; optionally, the inner layer further comprises an anti-caking masterbatch, such as Polybatch FSU-105-E (provided by A. Schulman (LyondellBasell)), in a content of 3 wt% or less, more preferably 2 wt% or less.

[0132] Preferably, all polymer components in the inner layer composition comprise ethylene polymers, or are preferably composed of ethylene polymers, including ethylene homopolymers and ethylene copolymers.

[0133] Preferably, in the sealant film of the present invention, the inner layer accounts for 5 to 25% of the total thickness of the sealant film, more preferably 7 to 20%, and most preferably 8 to 15%.

[0134] Subsurface

[0135] The sealant film of the present invention may include one or more sub-layers.

[0136] This subsurface layer is the intermediate layer of the membrane, and is located, for example, between the outer layer and the core layer and / or between the core layer and the inner layer.

[0137] If more than one sublayer exists in the membrane of the present invention, the multiple sublayers may have the same or different compositions, which can be selected from the embodiments described below.

[0138] Preferably, the subsurface layer is made of a subsurface layer composition including component AS, which is an ethylene copolymer.

[0139] Preferably, the ethylene copolymer component AS comprises polyethylene of any of the embodiments of component AC described above, or is composed of polyethylene of any of the embodiments of component AC described above.

[0140] The content of component AS in the subsurface composition is preferably 50-95 wt%, more preferably 60-90 wt%, and most preferably 70-85 wt%.

[0141] Furthermore, the subsurface composition preferably includes component BS, which is LDPE produced under high pressure.

[0142] Preferably, the LDPE component BS includes LDPE of any of the embodiments of component CC described above, or is composed of LDPE of any of the embodiments of component CC described above.

[0143] The content of component BS in the subsurface composition is preferably 5-40 wt%, more preferably 10-35 wt%, and most preferably 15-30 wt%.

[0144] Preferably, the subsurface composition comprises components AS and BS in a weight ratio of 60:40 to 95:5, more preferably 70:30 to 90:10, and most preferably 75:25 to 85:15, or is composed of components AS and BS in the above weight ratio.

[0145] Preferably, all polymeric components in the subsurface composition comprise ethylene polymers, or are preferably composed of ethylene polymers, including ethylene homopolymers and ethylene copolymers.

[0146] Preferably, in the sealant film of the present invention, the subsurface layer accounts for 5-30% of the total thickness of the sealant film, more preferably 10-25%, and most preferably 12-20%. If there is more than one subsurface layer in the sealant film, these values ​​apply to each subsurface layer.

[0147] sealant film

[0148] The polyolefin sealant film of the present invention includes an outer layer, a core layer, and an inner layer, as well as one or more optional sub-surface layers.

[0149] In a preferred embodiment, the sealant film comprises an outer layer, a first subsurface layer, a core layer, a second subsurface layer, and an inner layer, as described in any of the embodiments herein, or is composed of an outer layer, a first subsurface layer, a core layer, a second subsurface layer, and an inner layer, as described in any of the embodiments herein; wherein these layers exist in the film in the order described above and are adjacent to each other.

[0150] The preferred components for each layer are as described above.

[0151] Preferably, at least one of the core layer, inner layer, and optional one or more sub-surface layers is made of a composition comprising a linear low-density polyethylene (LLDPE) component, preferably a multi-peak copolymer component AC, and / or a catalytically produced polyethylene component BC, and / or a high-pressure produced low-density polyethylene (LDPE) component CC; the polyethylene component BC is an ethylene copolymer, preferably an ethylene terpolymer (II), having a melt flow rate (MFR5) of 0.6 to 4 g / 10 min as measured according to ISO 1133.

[0152] Preferably, based on the total weight of the sealant film, the sealant film of the present invention comprises 40-70 wt% AC component; and / or 15-35 wt% BC component; and / or 5-15 wt% CC component.

[0153] The total thickness of the sealant film of the present invention is typically 20–75 μm, preferably 25–60 μm, for example 30–50 μm.

[0154] The sealant film is preferably a non-oriented film. "Non-oriented" film includes any film that has not been intentionally stretched by more than 200% according to the dimensions of the produced product after film fabrication. Preferably, the film is not stretched by any subsequent heating and / or using stretching equipment (e.g., rollers) in the manner of production of biaxially oriented films (BOPP / BOPE) or uniaxially oriented films.

[0155] Preferably, the polymer portion of all layers of the sealant film is composed of polyolefins. Preferably, the polymer portion of the core layer, inner layer, and sub-surface layer (if present) is composed of ethylene polymers. More preferably, the polymer portion of the outer layer is composed of propylene polymers.

[0156] The sealant film of the present invention already has good barrier properties in its uncoated state.

[0157] Preferably, the WVTR (38°C, 90% RH) of the sealant film (before coating), measured according to ISO 15106-2, is less than or equal to 10 g / m³. 2 / d, more preferably less than or equal to 9.0 g / m 2 / d, for example, less than or equal to 8.4g / m 2 / d. WVTR is typically greater than 2g / m 2 / d, for example, greater than 3g / m 2 / d.

[0158] Furthermore, as described below, the OTR of the sealant film (before coating), measured according to ISO 15105-1 (23°C; 100% O2; 0% RH), is preferably less than or equal to 5500 cm⁻¹. 3 / m 2 / d, more preferably less than or equal to 4000cm 3 / m 2 / d. OTR is usually greater than 800cm 3 / m 2 / d, for example, greater than 1000cm 3 / m 2 / d.

[0159] The sealant film of the present invention has good rigidity.

[0160] Preferably, the longitudinal (MD) tensile modulus of the membrane of the present invention, as measured according to ISO 527-3, is greater than or equal to 250 MPa, for example, greater than or equal to 300 MPa. The longitudinal tensile modulus is typically less than 500 MPa.

[0161] Preferably, the transverse (TD) tensile modulus of the membrane of the present invention, as measured according to ISO 527-3, is greater than or equal to 200 MPa, for example, greater than or equal to 250 MPa. The transverse tensile modulus is typically less than 400 MPa.

[0162] Preferably, the longitudinal (MD) (1% secant) tensile stress (tensile strength) at break of the membrane of the present invention, measured according to ISO 527-3, is greater than or equal to 40 MPa, for example, greater than or equal to 45 MPa. The longitudinal tensile stress at break is typically less than 70 MPa.

[0163] Preferably, the transverse (TD) (1% secant) tensile stress (tensile strength) of the membrane of the present invention, measured according to ISO 527-3, is greater than or equal to 30 MPa, for example, greater than or equal to 35 MPa. The transverse tensile stress at break is typically less than 60 MPa.

[0164] If higher stiffness is required, the core layer preferably includes a higher content of components AC and / or BC, or is composed of components AC and / or BC.

[0165] The sealant film has a better contact angle measured on its outer layer. A low contact angle (before coating) is required to ensure good wettability of the coated surface and good adhesion of the resulting coating.

[0166] Preferably, the contact angle of the sealant film (its outer layer) is less than 90°, for example less than 80°. This contact angle is typically greater than 60°.

[0167] The sealant film further exhibited excellent performance under an optical microscope, with a smooth outer surface and almost no surface defects.

[0168] This membrane can be produced using any conventional method used for blown film production.

[0169] Before layer formation, the different polymer components in any layer of the film are typically closely mixed, for example using a twin-screw extruder, preferably a counter-rotating or co-rotating extruder. The blend is then converted into a co-extruded film structure. Preferably, the blend is converted into a co-extruded film structure on a blown film production line.

[0170] To manufacture the multilayer film of this invention, at least two polymer melt flows are typically extruded simultaneously through a multichannel tubular, annular, or circular die (i.e., co-extrusion) to form a tube, which is then blown, inflated, and / or cooled with air (or a combination of gases) to form a film. The manufacture of blown films is a well-known process.

[0171] The Embodiments section of this disclosure further describes in detail a method for producing a sealant film under specified conditions.

[0172] Barrier-coated sealant film

[0173] The present invention also relates to a barrier-coated sealant film, comprising a sealant film of any of the embodiments described herein and a barrier coating applied to the outer layer of the sealant film, preferably an inorganic barrier coating.

[0174] Coating and barrier coating are well-known processes in which a thin layer of barrier material is applied to the outer layer of a membrane. By definition, barrier coating provides barrier properties, preferably blocking water vapor and gases.

[0175] They can be used when the required function is to prevent water vapor or gases (such as oxygen) from entering or passing through the membrane or laminate.

[0176] Preferably, the barrier coating is formed using vapor deposition technology. Vapor deposition coatings used to form barrier layers on polymer films are typically performed using continuous physical or chemical vapor deposition methods. Various coatings can be formed using this method.

[0177] Preferably, the sealant film includes a barrier coating on the outer layer, the barrier coating comprising or consisting of a barrier coating component, the barrier coating component being a metal and / or a metal oxide.

[0178] Preferably, the barrier coating component is selected from metals Al, Au, Ag, Cr, Zn, Ti, Si, Cu, and oxides of these metals, as well as mixtures thereof. The most preferred metal is aluminum (Al). The most preferred metal oxide is aluminum oxide (AlO). x ), such as Al2O3.

[0179] The thickness of the coating can typically be between 5 and 200 nm. Below 5 nm, the barrier properties may be too low to be usable; above 200 nm, the coating has poor flexibility and is therefore more prone to cracking when applied to flexible substrates.

[0180] The coating thickness is preferably 5–100 nm, more preferably 8–50 nm.

[0181] The barrier properties of the coated sealant film of the present invention are further improved.

[0182] Preferably, the WVTR (38°C, 90% RH) of the sealant film (after coating), as measured according to ISO 15106-2, is less than 1.5 g / m³. 2 / d, more preferably less than 1.0 g / m 2 / d, for example, less than 0.8g / m 2 / d. WVTR is typically at least 0.2 g / m 2 / d.

[0183] Furthermore, according to ISO 15105-1 (23°C; 100% O2; 0% RH), the preferred OTR of the sealant film (after coating) is less than 200 cm⁻¹. 3 / m 2 / d, more preferably less than 150cm 3 / m 2 / d, for example, 130cm 3 / m 2 / d. OTR is usually at least 10cm. 3 / m 2 / d.

[0184] The barrier coating sealant film of the present invention has excellent coating (e.g., metal) adhesion and surface energy retention, which can be measured by the tape test described below and can be seen from the daily surface energy decay expressed in dyn / cm.

[0185] Preferably, the coated (preferably metallized) sealant film can maintain a surface energy of 35 dyn / cm or higher after 14 days, and the method for measuring the surface energy is as follows.

[0186] Preferably, the surface energy of the coated (preferably metallized) sealant film can be maintained at 30 dyn / cm or higher, more preferably 35 dyn / cm, after 21 days. The method for measuring the surface energy is as follows.

[0187] Preferably, the surface energy of the coated (preferably metallized) sealant film can be maintained at 30 dyn / cm or higher, more preferably 35 dyn / cm, after 46 days. The method for measuring the surface energy is as follows.

[0188] The coated (preferably metallized) sealant film exhibits excellent performance under an optical microscope, showing that the coated outer surface is smooth with almost no surface defects.

[0189] laminated film

[0190] The present invention also relates to a laminated polyolefin film, comprising a polyolefin sealant film and a substrate film according to any of the above embodiments.

[0191] According to ISO 15106-2, the water vapor transmission rate (WVTR) of the laminated film (38°C, 90% RH) is preferably less than 1.0 g / m³. 2 / d, more preferably less than 0.5g / m 2 / d, for example, less than 0.3 or 0.25 g / m 2 / d. WVTR is typically at least 0.05 g / m 2 / d.

[0192] According to ISO 15105-1, the oxygen permeability (OTR) of the laminated membrane (23℃; 100% O2; 0% RH) is preferably less than 25 cm⁻¹. 3 / m 2 / d, more preferably less than 15cm 3 / m 2 / d, with the optimal value being less than 10cm. 3 / m 2 / d, for example, less than 5cm 3 / m 2 / d. OTR is usually at least 1cm. 3 / m 2 / d.

[0193] According to ASTM D1709 Method A, the dart drop impact (DDI) of the laminate is preferably at least 130g, more preferably at least 145g, and for example at least 150g. The DDI is typically no more than 170g.

[0194] According to ISO 527-3, the longitudinal (MD) tensile modulus of the laminated film is preferably at least 800 MPa, more preferably at least 1000 MPa, for example at least 1100 MPa. The longitudinal tensile modulus is generally no more than 1500 MPa.

[0195] The thickness of the laminate is preferably 50-90 μm, more preferably 50-80 μm, for example 50-70 μm.

[0196] The present invention also relates to a laminated polyolefin film, comprising a substrate film and a sealant film, wherein the laminated polyolefin film has:

[0197] a) Less than 1.0 g / m² as measured according to ISO 15106-2 2 / d, more preferably less than 0.5g / m 2 / d, for example, less than 0.3 or 0.25 g / m 2 / d, preferably at least 0.05g / m 2 / d water vapor transmission rate (WVTR) (38℃, 90%RH);

[0198] b) Less than 25cm as measured according to ISO 15105-1 3 / m 2 / d, preferably less than 15cm 3 / m 2 / d, more preferably less than 10cm 3 / m 2 / d, for example, less than 5cm 3 / m 2 / d, preferably at least 1cm 3 / m 2 Oxygen permeability (OTR) per day (23℃; 100% O2; 0% RH);

[0199] c) A dart impact (DDI) of at least 145g, for example at least 150g, preferably not exceeding 170g, as measured according to ASTM D1709 Method A;

[0200] d) A longitudinal (MD) tensile modulus of at least 800 MPa, more preferably at least 1000 MPa, for example at least 1100 MPa, and most preferably not exceeding 1500 MPa, as measured according to ISO 527-3; and

[0201] e) 50–90 μm, more preferably 50–80 μm, for example, a thickness of 50–70 μm.

[0202] In one embodiment of the laminated film directly described above, the laminated film includes the polyolefin sealant film of any embodiment described in this disclosure.

[0203] The following disclosure applies to any embodiment of the laminated film, that is, any embodiment described in the above disclosure.

[0204] According to ISO 527-3, the transverse (TD) tensile modulus of the laminated film is preferably at least 800 MPa, more preferably at least 1000 MPa, for example at least 1150 MPa. The transverse tensile modulus typically does not exceed 1600 MPa.

[0205] The longitudinal (MD) relative tear resistance of the laminate, as measured below, is preferably at least 30 N / mm, more preferably at least 35 N / mm, and for example at least 36 N / mm. The longitudinal relative tear resistance typically does not exceed 60 N / mm.

[0206] The transverse (TD) relative tear resistance of the laminate, as measured below, is preferably at least 50 N / mm, more preferably at least 60 N / mm, and for example at least 70 N / mm. The transverse relative tear resistance typically does not exceed 100 N / mm.

[0207] In one embodiment, the laminate has a thickness of less than 25 cm as measured according to ISO 15105-1. 3 / m 2 Oxygen permeability (OTR) per day (23°C; 100% O2; 0% RH), and / or less than 0.5 g / m² as measured according to ISO 15106-2. 2 / d water vapor transmission rate (WVTR) (38℃, 90%RH).

[0208] In one embodiment, the laminated polyolefin film comprises a propylene polymer component AO in a content of less than 10 wt%, preferably less than 8 wt%, and more preferably less than 7 wt%, based on the total weight of the laminated polyolefin film.

[0209] In one embodiment, the laminated polyolefin film comprises one or more ethylene polymers, with the content of the ethylene polymers being at least 90 wt%, preferably at least 92 wt%, and more preferably at least 93 wt%, based on the total weight of the laminated polyolefin film.

[0210] In one embodiment, based on the total weight of the laminated polyolefin membrane, the laminate includes a propylene polymer component AO and one or more ethylene polymers; the content of the propylene polymer component AO is less than 10 wt%, preferably less than 8 wt%, more preferably less than 7 wt%; the content of the ethylene polymer is at least 90 wt%, preferably at least 92 wt%, more preferably at least 93 wt%. In various embodiments where all polymer components of the laminate are composed of polyolefins, the laminate is easily recyclable and therefore a sustainable laminate.

[0211] Laminates comprising a sealant film and a substrate film can be produced using uncoated or coated sealant films, with coated sealant films, such as metallized sealant films, being preferred.

[0212] Laminated films are produced by laminating a sealant film onto a substrate film. This can be done on any commonly used lamination equipment using conventional lamination methods (e.g., adhesive lamination), including solvent-based and solvent-free adhesive lamination using any commonly used, commercially available adhesive (e.g., LA7825 (provided by Henkel Corporation)). Optionally, the adhesive and hardener can be mixed in, for example, a 2:1 ratio. Lamination can also be performed without any adhesive, such as sandwich lamination with or without a melt web that can be pressed between the substrates. This melt web can be any common polyethylene-based melt web material, such as LDPE. Lamination can be further performed using extrusion coating techniques. All of these lamination methods are well known in the art and described in the literature. One lamination method is described in detail in the Examples section of this document.

[0213] The sealant film is laminated onto the substrate film through its outer layer.

[0214] In one embodiment of the laminated film, the outer layer of the sealant film (coated or uncoated) is laminated onto the outer layer of the substrate film.

[0215] In another embodiment of the laminated film, the inner layer of the sealant film is laminated onto the outer layer of the substrate film.

[0216] In a preferred embodiment of the laminated film, the coated outer layer of the sealant film is laminated onto the external layer of the substrate film, preferably onto the outer layer.

[0217] Substrate film

[0218] The substrate film is preferably a polyolefin film, more preferably a polyethylene film, which includes an ethylene polymer, and is preferably composed of an ethylene polymer.

[0219] Preferably, the substrate film includes at least one outer layer, one core layer, and one inner layer, and optionally includes one or more sub-surface layers, wherein the sub-surface layers are located between the outer layer and the core layer and / or between the inner layer and the core layer. The outer layer and the inner layer may be similar.

[0220] Preferably, all layers of the substrate film are made of a composition comprising or composed of an olefin polymer (preferably an ethylene polymer).

[0221] In one embodiment, the core layer of the substrate film is made of a composition comprising an ethylene polymer component SC, the density of which is 920–940 kg / cm³. 3 MFR2 was 0.1–2.0 g / 10 min, as measured according to ISO 1133.

[0222] Preferably, the ethylene polymer component SC includes any embodiment of component BC described herein, or is composed of any embodiment of component BC described herein.

[0223] Preferably, the content of component SC in the core layer of the substrate film is 50-90 wt%, more preferably 60-80 wt%.

[0224] Preferably, one or more layers of the substrate film are made of a composition comprising an HDPE component.

[0225] In one embodiment, the substrate film is a non-oriented film as described above.

[0226] In another embodiment, the substrate film is a biaxially oriented film.

[0227] In a preferred embodiment, the substrate film is uniaxially oriented, preferably longitudinally oriented (MDO) film.

[0228] Methods for fabricating oriented films are well known in the art. The Examples section of this document describes in detail a method for producing MDO films. In short, as described above, the primary film is prepared as a cast film or a blown film.

[0229] Preferably, the thickness of the primary membrane is 80–250 μm, more preferably 90–225 μm, and even more preferably 100–200 μm.

[0230] The choice of the thickness of the primary film before orientation may depend on the draw ratio or stretch ratio and the desired final thickness of the oriented film. The primary film is then stretched longitudinally to at least three times its original length, for example, three to twenty times. The most preferred film of the present invention is stretched at a stretch ratio of 1:4 to 1:10, for example, 1:5 to 1:7.

[0231] The thickness of the resulting alignment film is preferably at most 40 μm, for example 10 to 40 μm, more preferably 12 to 35 μm, and most preferably 15 to 30 μm.

[0232] In one embodiment, the substrate film is uniaxially oriented, preferably longitudinally oriented (MDO), with a stretch ratio of 1:4 to 1:10, preferably 1:5 to 1:7, and a thickness of 15 to 30 μm.

[0233] Items and Applications

[0234] The present invention also relates to articles comprising laminated polyolefin films of any of the embodiments described herein.

[0235] Finally, this invention relates to the application of laminated polyolefin films of any of the embodiments described herein in the production of articles.

[0236] Preferably, the above-mentioned items are sealed packages, pouches, sacks, or bags filled in a vertical or horizontal manner.

[0237] The invention will be further described below with reference to the embodiments shown in the following figures:

[0238] Figure 1 : Tensile modulus and tensile strength of the sealant film before coating;

[0239] Figure 2 : Surface energy (dyn / cm) of the sealant film as a function of time after metallization coating;

[0240] Figure 3 : Metal adhesion of the coated sealant film;

[0241] Figure 4 The content of xylene-soluble (XS) in the film composition used on the outer surface layer of the sealant film;

[0242] Figure 5 : Optical microscope image of the film surface before coating;

[0243] Figure 6 Optical microscope image of the metallized film surface.

[0244] Measurement and determination methods

[0245] The definitions of the following terms and the measurement methods apply to the above general description of the present invention and the following embodiments. Unless otherwise stated, measurements were performed on a sealant film with a thickness of approximately 35 μm, an MDO substrate film with a thickness of 21.5 μm, and / or a laminated film with a thickness of 61–62 μm.

[0246] a) Melt Flow Rate (MFR)

[0247] Melt flow rate (MFR) is determined according to ISO 1133 and expressed in g / 10 min. A higher melt flow rate corresponds to a lower polymer viscosity. The MFR for polyethylene is determined at 190°C, and the MFR for polypropylene is determined at 230°C, with loads of 2.16 kg (MFR2), 5.00 kg (MFR5), or 21.6 kg (MFR6). 21 ).

[0248] FRR (Fluid Flow Ratio) is an indicator of molecular weight distribution, representing the flow ratio under different loads. Therefore, FRR... 21 / 5 MFR 21 The value of / MFR5, FRR 21 / 2 MFR 21 The value of / MFR2.

[0249] b) Density

[0250] The density of the polymer was determined according to ISO 1183-1:2004 (Method A) by means of a molded specimen prepared in accordance with EN ISO 1872-2 (February 2007), and the unit is kg / cm³. 3 .

[0251] c) GPC

[0252] (1) GPC conventional methods

[0253] According to ISO 16014-1:2003, ISO 16014-2:2003, ISO 16014-4:2003 and ASTM D 6474-12, the average molecular weight (M) is measured by gel permeation chromatography (GPC) using the following formula. z M w and M n Molecular weight distribution (MWD, defined as M) w / M n Its width, and the polydispersity index PDI = M w / M n (where M) n M is the number average molecular weight. w (Weight-average molecular weight) represents the width of the molecular weight distribution.

[0254]

[0255]

[0256]

[0257] For a constant elution volume interval ΔVi, where Ai and Mi are the chromatographic peak area and the molecular weight (MW) of the polyolefin associated with the elution volume Vi, respectively, and N is equal to the number of data points obtained from the chromatography between the integration limits.

[0258] The high-temperature GPC instrument used was equipped with an infrared (IR) detector (PolymerChar IR4 or IR5 from Valencia, Spain) or a differential refractometer (Agilent Technologies (RI), equipped with three Agilent PLgel Olexis columns and one Agilent PLgel Olexis Guard column). A mobile phase of 1,2,4-trichlorobenzene (TCB) stabilized with 250 mg / L 2,6-di-tert-butyl-4-methylphenol was used. The chromatographic system was run at a column temperature of 160 °C, a detector temperature of 160 °C, and a constant flow rate of 1 mL / min. 200 μL of sample solution was injected for each analysis. Data collection was performed using Agilent Cirrus version 3.3 software or PolymerChar GPC-IR control software.

[0259] The column assembly was calibrated using 19 narrow MWD polystyrene (PS) standards ranging from 0.5 kg / mol to 11500 kg / mol. The PS standards were dissolved at room temperature for several hours. The conversion of polystyrene peak molecular weight to polyolefin molecular weight was performed using the Mark Houwink equation and the following Mark Houwink constant.

[0260] K PS =19 x 10 -3 mL / g, α PS =0.655

[0261] K PE =39 x 10 -3 mL / g, α PE =0.725

[0262] The calibration data were fitted using a third-order polynomial fitting method.

[0263] All prepared samples were in the concentration range of approximately 1 mg / ml. The PE samples were dissolved in freshly distilled TCB at 160°C for 3 hours with continuous slow shaking at a concentration of approximately 1 mg / ml.

[0264] (2) GPC viscosity method

[0265] The average molecular weight of LDPE (M z M w and M nThe molecular weight distribution (MWD) was determined using the universally calibrated GPC-viscosity method. The average molecular weight (M...) w M n ), molecular weight distribution (MWD) and polydispersity index PDI = M w / M n (where M) n M is the number average molecular weight. w Molecular weight widths (expressed as weight-average molecular weight) were determined by gel permeation chromatography (GPC) according to ISO 16014-4 2019. A PL220 (Polymer Laboratories) GPC equipped with an IR4 infrared detector and an online four-capillary bridge viscometer (PL-BV 400-HT) was used. Three Olexis columns and one Olexis Guard column from Polymer Laboratories were used as the stationary phase, and 1,2,4-trichlorobenzene (TCB, stabilized with 250 mg / L 2,6-di-tert-butyl-4-methylphenol) was used as the mobile phase. The temperature was 160 °C, and the flow rate was constant at 1 mL / min. 200 μL of sample solution was injected for each analysis. The corresponding detector constant and inter-detector delay volume of the viscometer were determined using a narrow PS standard with a molar mass of 132900 g / mol and an intrinsic viscosity of 0.4789 dl / g (MWD = 1.01). The detector constant of the IR4 detector was determined using NIST 1475a, and the dn / dc ratio was 0.094 cm⁻¹. 3 / g.

[0266] The column assembly was calibrated using a universal calibration method (according to ISO 16014-2:2019) with at least 15 narrow MWD polystyrene (PS) standards ranging from 0.5 kg / mol to 11600 kg / mol. The intrinsic viscosity of the PS standards was calculated based on the corresponding concentration (IR4) of the PS standards, the online viscometer signal, and the measured detector constant for polystyrene. Due to end-group effects in the infrared detector, the initial weight-out concentration was used for low molecular weight PS with a molar mass below 3000 g / mol.

[0267] Using a universal calibration method, the molecular weight (M2) of a sample on each chromatogram can be calculated using the following relationship.

[0268] logM1[η1]=V R =logM2[η2]

[0269] M1: Molar mass of PS;

[0270] η1: Intrinsic viscosity of PS;

[0271] M2: Molar mass of the sample;

[0272] η2: Intrinsic viscosity of the sample;

[0273] V R : Preserve volume.

[0274] All data processing and calculations were performed using Cirrus Multi-Offline SEC Software version 3.2 (Polymer Laboratories a Varian inc. Company).

[0275] All samples were prepared by dissolving 5.0–9.0 mg of polymer in 8 mL of stable TCB (same as the mobile phase) at 160 °C with continuous, slow shaking. PP was dissolved for 2.5 hours or PE for 3 hours at a maximum temperature of 160 °C.

[0276] d) Comonomer content

[0277] For the determination method of comonomer content, please refer to pages 31 to 34 of WO2019081611.

[0278] e) Mechanical properties

[0279] (1) Tensile modulus

[0280] According to ISO 527-3, the longitudinal (MD) tensile modulus and transverse (TD) tensile modulus were measured at a test speed of 1 mm / min and a gauge length of 100 mm, and were taken as the 1% secant modulus.

[0281] (2) Tensile stress at break

[0282] According to ISO 527-3, longitudinal (MD) and transverse (TD) tensile stresses at break (also known as tensile strength) are measured using a type 2 specimen with a gauge length of 50 mm and a test speed of 200 mm / min.

[0283] (3) Dart Impact

[0284] The dart impact was determined according to ASTM D1709-Method A.

[0285] (4) Relative tear resistance

[0286] The longitudinal relative tear resistance and transverse relative tear resistance were determined according to ISO 6383-2.

[0287] h) Barrier performance

[0288] (1) Water vapor transmission rate (WVTR)

[0289] Water vapor transmission rate was determined under humid and hot conditions (38°C; 90% RH) according to ISO 15106-2.

[0290] (2) Oxygen Transmission Rate (OTR)

[0291] Oxygen permeability was determined according to ISO 15105-1 under standard conditions (23°C; 100% O2; 0% RH).

[0292] i) Heat sealing parameters

[0293] The seal initiation temperature (SIT) and maximum sealing force under 5N force were determined according to ASTM F2029 and ASTM F88.

[0294] j) Xylene-soluble substances (XS)

[0295] The xylene-soluble (XS) component of this invention was determined according to ISO 16152 as follows: 2.0 g of polymer was dissolved in 250 ml of p-xylene with stirring at 135 °C. After 30 minutes, the solution was cooled at ambient temperature for 15 minutes, and then allowed to settle at 25 ± 0.5 °C for 30 minutes. The solution was filtered through filter paper into two 100 ml flasks. The solution in the first 100 ml container was evaporated in a nitrogen stream, and the residue was dried under vacuum at 110 °C until constant weight was achieved (approximately 3 hours). The xylene-soluble content (percentage) can be determined as follows:

[0296] XS%=(100*m*V0) / (m0*v); m0=initial polymer amount (g); m=residual weight (g); V0=initial volume (ml); v=analytical sample volume (ml).

[0297] k) Contact angle

[0298] The contact angle was determined according to ASTM D-7334 as follows. The sessile drop technique was used to measure the contact angle of the polymer film. A water droplet of known density was placed on the film surface. The instrument for measuring the contact angle consisted of a light source, a sample holder, a dropper syringe, and an image acquisition system. The sample to be analyzed was 1 × 1 cm in size. 2 Approximately 10×10cm 2 The samples were examined. The contact angle θ between each droplet and the polymer surface was measured. The resulting images were processed using appropriate software to obtain the contact angle. The contact angle value may be related to the cleanliness and smoothness of the surface.

[0299] l) Surface tension retention

[0300] Surface tension retention is determined according to ASTM D-2578.

[0301] m) Metal adhesion

[0302] Metal adhesion was measured using an adhesive tape test. A sample of the metallized substrate was placed on a smooth, flat surface with the metallized layer facing upwards. Then, a 6-inch (15.24 cm) Scotch tape was used. TM Apply 610 tape to the surface and smooth it with your thumb and forefinger to ensure good contact. Fold one end of the tape over to facilitate separation. Then, hold the sample with one hand and gently peel the tape back approximately 180° with the other. Afterward, use strong backlighting to inspect the metal removal from the test substrate and the metal transfer from the tape used.

[0303] m) Melting point

[0304] Melting point was determined according to ISO 11357-3.

[0305] n) Thickness

[0306] The thickness of the film and layer was determined according to ASTM D6988. Example

[0307] The production and measurement of barrier-coated (metallized) films and laminates (laminated parts) are carried out as described below.

[0308] 1) Preparation of sealant film

[0309] a) Preparation of 5-layer sealant film

[0310] Three comparative films (comparative examples CE-1, CE-2 and CE-3) and one film of the present invention (inventive example IE-1) were used to form a 5-layer blown film.

[0311] Table 1 shows the structure and composition of the comparative and inventive films, where layer A represents the outer (outer) layer corresponding to the film layer used for vacuum metallization. Layer B is the first subsurface layer, located between the outer layer and the core layer (core layer C); layer D is the second subsurface layer, located between the core layer C and the inner (sealing) layer E. The outer and inner (sealing) layers (layers A and E) each account for 10% of the total film thickness, subsurface layers 1 and 2 each account for 15% of the total film thickness, and the core layer accounts for 50% of the total film thickness, with a total film thickness of approximately 35 μm.

[0312] The polymers used in the layers are indicated by their trade names. The polymer content of each layer in Table 1 is expressed in wt%, based on the total weight of the constituent layers.

[0313] Table 1

[0314]

[0315]

[0316] Anti-caking agent: Polybatch FSU-105-E

[0317] Table 2 below shows the properties of the polymers used to produce the films of the present invention and comparative examples in Table 1.

[0318] Table 2

[0319]

[0320] *Borshape FX1001's MFR5

[0321] The processability of the resin and a 5-layer film with an A / B / C / D / E structure was evaluated on a large blown film equipment. A 5-layer blown film was produced using a blown film production line manufactured by Alpine. Performance analysis was performed on blown films with a thickness of approximately 35 μm produced under process conditions of a die gap of 1.8 mm, low neck height, and a blown film ratio of 3.0:1. Table 3 lists the properties of the blown film production line.

[0322] Table 3

[0323] mold diameter 300mm mold gap 1.8mm Blown film ratio (BUR) 3.0:1 Foam Cooling IBC Cooling air temperature 22℃ Corona treatment 48dyn / cm

[0324] The temperature distribution of the blown film production line, i.e. the temperature (°C) used at different locations of the blown film production line, is shown in Table 4.

[0325] Table 4M3(CE-1)

[0326]

[0327] M5(CE-2)

[0328]

[0329] M9(CE-3)

[0330]

[0331] M6(IE-1)

[0332]

[0333] b) Performance of 5-layer polyethylene sealant film (uncoated)

[0334] Tensile modulus

[0335] like Figure 1As shown, both the membranes of this invention and the comparative membranes exhibit excellent tensile modulus (1% secant). In particular, the longitudinal (MD) values ​​of all membranes are greater than 300 MPa. This means that the outer polypropylene-containing membranes possess sufficient stiffness, providing an excellent substrate for coating as they are able to withstand membrane tension during the process. The stiffness of the membranes can be further improved by using bimodal ternary polymers, such as Borshape FX1001 and Anteo FK1820, in the core layer.

[0336] tensile strength

[0337] Further as Figure 1 As shown, all membranes exhibit good tensile strength (tensile stress at break) along both the longitudinal (MD) and transverse (TD) directions. The longitudinal results of the membrane IE-1 of this invention and the comparative membrane CE-2 are the best, while the IE-1 membrane has the highest transverse value.

[0338] Contact angle

[0339] As shown in Table 5 below, all polypropylene materials used for the outer layer of the film exhibit a favorable contact angle of less than 90° (on the uncoated surface). Therefore, all of these materials are suitable for coating because a low contact angle (before coating) is required to achieve good wettability of the coated surface and good adhesion after coating. The content of polypropylene materials is expressed in wt% based on the total weight of their respective outer layer components.

[0340] Table 5

[0341]

[0342] Surface structure under a microscope

[0343] Figure 5 Optical microscope images of the uncoated film (outer surface) at 200x magnification are shown. Particularly for the CE-3 / M9 film, obvious surface defects were detected, appearing as dots and scratches. Other films performed much better, with the IE-1 / M6 film exhibiting the smoothest surface and the fewest surface defects.

[0344] Xylene soluble substances

[0345] The content of xylene-soluble matter (XS) in the outer membrane component was measured, and the results are as follows: Figure 4 As shown, the IE-1 membrane of the present invention has an extremely low xylene-soluble content, only 1.4 wt%. All comparative membranes have significantly higher xylene-soluble contents (all greater than 9 wt%, with a maximum of 18 wt%). Since xylene-soluble content is related to surface tension, the membrane of the present invention exhibits better surface energy results (lower dyne decay over time).

[0346] Membrane barrier properties (WVTR and OTR)

[0347] The water vapor transmission rate (WVTR) (38°C; 90% RH) and oxygen transmission rate (OTR) (23°C; 100% O2; 0% RH) of the membrane before and after metallization coating were measured according to ISO 15106-2 and ISO 15105-1, respectively. Referring to Table 8 below, the membrane IE-1 of the present invention already had the lowest WVTR (8.1 g / m³) before coating. 2 / d) and OTR (3900cm) 3 / m 2 / d) value. As described below, the barrier properties are greatly improved by coating.

[0348] 2) Coated film

[0349] a) Coating (metallization) process

[0350] The five-layer film was coated using a plasma metallizer, achieving an optical density of 2.3. Metallization of the outer layer (corona-treated side) was performed via physical vapor deposition after photoplasma pretreatment. The metal (aluminum) was heated and evaporated under vacuum conditions, subsequently condensing on the outer surface to form a layer of approximately 10-20 nm.

[0351] b) Performance of the coated (metallized) film

[0352] Surface tension (dyne decay)

[0353] Figure 2 The changes in surface tension decay over time are shown, which were measured periodically (0, 8, 14, 21, and 46 days) after metallization.

[0354] The high surface tension (dyn / cm) of the coated film is of great significance for its subsequent processing and use. According to... Figure 2 It can be noted that the surface energy of the metallized surfaces in the comparative examples decreased. After 21 days, the membrane IE-1 of the present invention was the only one that still possessed high surface energy. The surface energy of most of the comparative membranes was already below 36 dyn / cm only 14 days after metallization. Therefore, only the membrane of the present invention maintained a surface energy level suitable for conversion without the need for corona treatment or the use of a primer.

[0355] Metal adhesion

[0356] Metal adhesion was measured according to the "tape test" procedure described above. After metallization, the metal adhesion of the film was measured periodically (0, 8, 14, 21, and 46 days). Table 7 and Figure 3The results of the metal adhesion measurements are shown, obtained according to the conditions for grading them in Table 6. The polymer content in each layer of Table 7 is expressed in wt%, based on the total weight of the constituent layers.

[0357] Table 6

[0358]

[0359] Table 7

[0360]

[0361]

[0362] All membranes exhibited excellent metal adhesion, rated 4 or 5. In particular, the metal adhesion of all membranes remained stable over the 46-day measurement period. To avoid the potential negative effects of migrating additives, no such additives were used in the membranes.

[0363] Surface structure under a microscope (after coating)

[0364] like Figure 6 The image shown is an optical microscope image of the metallized film (outer surface) at 200x magnification. Defects also appeared on the surface of the CE-3 / M9 film after metallization. Similar defects were found in the CE-2 / M5 film. The surfaces of the IE-1 / M6 film and the CE-1 / M3 film were very smooth and clean.

[0365] Membrane barrier properties (WVTR and OTR)

[0366] The water vapor transmission rate (WVTR) (38℃; 90% RH) and oxygen transmission rate (OTR) (23℃; 100% O2; 0% RH) of the film before and after coating were determined according to ISO 15106-2 and ISO 15105-1, respectively. The results are shown in Table 8 below.

[0367] Compared to non-metallized films, the metallized films showed significant improvements in WVTR and OTR. The membrane IE-1 of this invention exhibited excellent results in both WVTR and OTR, followed by the comparative membrane CE-3, with IE-1 showing a WVTR of less than 1.0 g / m³. 2 / day, OTR less than 150cm 3 / m 2 / day. Based on the total weight of each layer, the polymer content in each layer in Table 8 is expressed in wt%.

[0368] Table 8

[0369]

[0370] summary

[0371] In summary, the IE-1 film of the present invention exhibits optimal performance as a metallized film with potential packaging applications. In particular, although CE-3 / M9 exhibits good performance, for example, in terms of barrier properties, its outer layer has a high xylene-soluble content (~10 wt%) and its surface energy decays very rapidly, which may be a disadvantage for long-term use in barrier coating encapsulation.

[0372] 3) Laminated film

[0373] a) Preparation of laminated films

[0374] Laminated films are widely used in packaging applications. The metallized film of this invention, which boasts the best performance, along with two contrasting metallized films, CE-2 and CE-3, are laminated onto a longitudinally oriented (MDO) polyethylene substrate film.

[0375] Preparation of primary substrate film

[0376] A primary substrate film with a total of 5 layers was prepared on a blown film production line. Its composition and layer distribution are shown in Table 9. FX1001 is an LLDPE polymer, while BB2581 and CG9620 are HDPE polymers. Zones 1-5 of all extruders were heated at 180°C, and the screen changer was heated at 195°C. A primary film with a thickness of 140 μm was obtained.

[0377] Table 9

[0378] polymer outer layer Subsurface 1 Core layer Subsurface 2 Inner layer Layer thickness (%) 15 10 50 10 15 FX1001 70 BB2581 80 80 30 80 80 CG9620 20 20 20 20

[0379] Orientation of primary substrate steamed buns

[0380] The primary film is oriented longitudinally to obtain a longitudinally oriented (MDO) film. Multiple heating rollers are used to heat the primary film to the orientation temperature. The heated primary film is then fed into a slow stretching roller with nip rollers, which roll at the same speed as the heating rollers. Next, the primary film enters a fast stretching roller, where it is uniaxially stretched at a speed 5 to 7 times faster (currently 6.5 times) than the slow stretching rollers. This process achieves continuous and effective orientation of the film. The oriented film is then annealed by holding it at a high temperature for a period of time to allow for stress relaxation.

[0381] The stretching was performed using a uniaxial stretching machine manufactured by Hosokawa Alpine AG in Augsburg, Germany. This process unit consists of preheating, stretching, annealing, and cooling sections, each at specific temperatures to optimize the unit's performance and produce a film with the desired properties. The heating temperature was 105°C, the stretching temperature was 117°C, and annealing cooling was completed from 110°C to 40°C. Using this method, an MDO substrate film with a thickness of 21.5 μm was obtained (the primary film thickness was 140 μm, with a stretch ratio of 1:6.5).

[0382] laminated

[0383] To prepare the laminated film, the outer layer of the MDO substrate film was laminated with the metallized outer layers of IE-1, CE-2, and CE-3 films. Since the MDO substrate film is made of polyethylene, the polypropylene content in the laminated film is less than 7 wt%.

[0384] The metallized film was laminated at Henkel using a 2:1 mixture of adhesive LA7825 and hardener LA6230 (both supplied by Henkel). Lamination was performed on a solventless laminator at a speed of 150 m / min, with an adhesive content of 1.8 g / m³. 2 The corona treatment intensity for the carrier web was 2.5 kW, and the corona treatment intensity for the secondary web was 1.5 kW. A laminate with a thickness of approximately 62 μm was obtained.

[0385] b) Performance of the laminate

[0386] Table 10 shows the properties of the prepared laminates.

[0387] Table 10

[0388]

[0389] Tensile modulus

[0390] The longitudinal and transverse tensile moduli of the laminated film of the present invention are higher than those of the comparative laminated film, thus the laminated film of the present invention has higher stiffness.

[0391] Dart impact and relative tear resistance

[0392] Dart impact resistance and relative tear resistance (longitudinal and transverse) are important factors in maintaining the high mechanical properties of laminated components. These parameters of the laminate of this invention are superior to those of two comparative laminates. In particular, the dart impact resistance of the laminate of this invention is more than 20% higher than that of the CE-3 laminate.

[0393] Barrier performance

[0394] The laminate of this invention exhibits optimal moisture-proof performance, i.e., water vapor transmission rate (WVTR). The CE-3 laminate also shows similar results. The CE-2 laminate has a value 10 times higher. For good performance, a value of less than 0.5 g / m³ is generally preferred. 2 The value of / d.

[0395] The oxygen barrier (OTR) performance of the laminates exhibits a similar ranking, with the laminate of this invention performing best, followed by the CE-3 laminate, and the CE-2 laminate showing a value approximately 100 times higher. For optimal performance, a thickness of less than 15 cm is generally preferred. 3 / m 2 The value of / day.

Claims

1. A polyolefin sealant film comprising an outer layer, a core layer, and an inner layer, and optionally at least one sub-surface layer, said outer layer being made of an outer layer composition comprising, based on the total weight of said outer layer composition, 90-100 wt% of a propylene polymer component AO. in, The xylene-soluble XS content of the outer layer composition, as determined by ISO 16152, is less than 3.5 wt%. The propylene polymer component AO is a propylene homopolymer, and The sealant film includes a barrier coating on the outer layer, wherein the barrier coating includes a barrier coating component selected from metals Al, Au, Ag, Cr, Zn, Ti, Si, Cu and oxides of these metals, and mixtures thereof.

2. The polyolefin sealant film according to claim 1, wherein, The propylene polymer component AO in the outer layer composition comprises isotactic propylene homopolymer with an MFR2 of 1.0–5.0 g / 10 min as determined by ISO 1133 and / or a melting point of 155–175 °C as determined by ISO 11357-3.

3. The polyolefin sealant film according to claim 1, wherein, Based on the total weight of the outer layer composition, the outer layer composition comprises 95 to 100 wt% of a propylene polymer component AO.

4. The polyolefin sealant film according to claim 1, wherein, At least one of the layers of the sealant film is made of a composition comprising a linear low-density polyethylene (LLDPE) component, and / or a catalytically produced polyethylene component BC, and / or a high-pressure produced low-density polyethylene (LDPE) component CC.

5. The polyolefin sealant film according to claim 4, wherein, Based on the total weight of the sealant film, the sealant film comprises 40-70 wt% of a multi-peak copolymer component AC, and / or 15-35 wt% of a catalytically produced polyethylene component BC, and / or 5-15 wt% of a CC component.

6. The polyolefin sealant film according to claim 4 or 5, wherein, The density of component AC is 910–925 kg / m³. 3 MFR2 is 0.5–5.0 g / 10 min; and / or, the density of component BC is 920–940 kg / cm³. 3 MFR2 is 0.1–2.0 g / 10 min; and / or, the density of the CC component is 910–930 kg / cm³. 3 MFR2 ranged from 0.1 to 2.5 g / 10 min, and was measured according to ISO 1133.

7. The polyolefin sealant film according to claim 1, wherein, The oxygen permeability (OTR) of the sealant membrane, measured according to ISO 15105-1 at 23°C, 100% O2, and 0% RH, is less than 200 cm⁻¹. 3 / m 2 / d; and / or, the water vapor transmission rate (WVTR) of the sealant membrane, measured according to ISO 15106-2 at 38°C and 90%RH, is less than 1.5 g / m³. 2 / d.

8. A laminated polyolefin film comprising the polyolefin sealant film and the substrate film as described in any one of claims 1-7.

9. The laminated polyolefin film according to claim 8, wherein, The laminated polyolefin film has the following characteristics: a) Less than 1.0 g / m² as measured according to ISO 15106-2 at 38°C and 90% RH. 2 / d water vapor transmission rate (WVTR); and / or, b) Measured according to ISO 15105-1 at 23°C, 100% O2, and 0% RH, less than 25 cm 3 / m 2 / d oxygen permeability (OTR); and / or, c) A dart impact (DDI) of at least 145g as measured according to ASTM D1709 Method A; and / or, d) A longitudinal (MD) tensile modulus of at least 800 MPa, as measured according to ISO 527-3; and / or, e) Thickness of 50–90 μm.

10. A laminated polyolefin film, comprising a substrate film and a sealant film, wherein, The laminated polyolefin film has the following characteristics: a) Less than 1.0 g / m² as measured according to ISO 15106-2 at 38°C and 90% RH. 2 / d water vapor transmission rate (WVTR); b) Measured according to ISO 15105-1 at 23°C, 100% O2, and 0% RH, less than 25 cm 3 / m 2 Oxygen permeability (OTR) per day; c) A dart impact (DDI) of at least 145g as measured according to ASTM D1709 Method A; d) A longitudinal (MD) tensile modulus of at least 800 MPa, as measured according to ISO 527-3; and e) Thickness of 50–90 μm, Wherein, the sealant film includes the outer layer as defined in claim 1; and The sealant film includes a barrier coating on the outer layer, wherein the barrier coating includes a barrier coating component selected from metals Al, Au, Ag, Cr, Zn, Ti, Si, Cu and oxides of these metals, and mixtures thereof.

11. The laminated polyolefin film according to claim 10, wherein, The laminated polyolefin film includes the polyolefin sealant film of claim 1.

12. The laminated polyolefin film according to claim 8, wherein, The substrate film comprises at least one ethylene polymer.

13. The laminated polyolefin film according to claim 8, wherein, Based on the total weight of the laminated polyolefin film, the laminated polyolefin film includes a propylene polymer component AO with a content of less than 10 wt%; and / or, based on the total weight of the laminated polyolefin film, the laminated polyolefin film includes at least one ethylene polymer with a content of at least 90 wt%.

14. An article comprising a laminated polyolefin film according to any one of claims 8 to 13.

15. The use of the laminated polyolefin film according to any one of claims 8 to 13 in the production of articles.

16. The application of the laminated polyolefin film according to claim 15, wherein, The item is a sealed package, bag, or pouch filled vertically or horizontally.

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