Sustainable polyethylene laminate for packaging

Abstract

The present invention provides a polyethylene laminate film having an inner surface and an outer surface, a) A printed film comprising an outer layer E, a core layer F and an inner layer G, the inner layer G forming the outer surface of the laminate film, the inner layer G having a compressive strength of 920 to 935 kg / m 3 a printed film made of an inner layer G composition including a component AG that is an ethylene copolymer having a density of 0.5 to 2.0 g / 10 min and a melt flow rate (MFR2) measured in accordance with ISO 1133; and b) a sealant film comprising an outer layer A, a core layer B and an inner layer C, said inner layer C forming said inner surface of said laminate film, said inner layer C being made of an inner layer C composition comprising at least one ethylene polymer; Including, The outer layer A of the sealant film is laminated to the outer layer E of the printing film, The present invention relates to a polyethylene laminate film, wherein the seal initiation temperature (SIT) at 5N of the outer surface of the laminate film is at least 10°C higher than the seal initiation temperature at 5N of the inner surface of the laminate film, the seal initiation temperature being measured according to ASTM F 2029 and ASTM F 88. The present invention further relates to an article comprising the polyethylene laminate film, and the use of the polyethylene laminate film for packaging an article.The present invention further relates to a sealant film, a molded article comprising the sealant film, and the use of the sealant film for packaging a molded article.

Description

[Technical Field]

[0001] This invention relates to a polyethylene laminate film comprising a printing film and a sealant film. Furthermore, this invention relates to articles comprising polyethylene laminate film and the use of polyethylene laminate film in packaging applications. This invention also relates to sealant film and its use in packaging applications. [Background technology]

[0002] Laminate films are widely used in packaging applications. Conventional flexible packaging laminates include different polymer families, such as polyester (e.g., PET), polyamide, or oriented polypropylene (e.g., BOPP) as printing films, and polyethylene (PE) as a sealant film. Laminates are generally employed in the packaging industry to match the multifunctional requirements of different films, namely, sufficient toughness-related properties of the sealant film to ensure the integrity of the package without distortion or rupture, and the rigidity and barrier-related properties of the base film, particularly when packaging with form-fill seal (FFS) machines, to ensure improved shelf life and subsequent handling and operation of the packaged goods. In addition to excellent sealing performance, sealant films are desired to exhibit balanced behavior of impact strength (e.g., dirt impact) and mechanical properties (e.g., rigidity, tensile strength), as well as good aesthetic performance (e.g., gloss and transparency). The base material is laminated with polyethylene sealant film, providing excellent rigidity, heat resistance, optical properties, and barrier properties.

[0003] Recently, there has been a growing trend to provide "pure" polyethylene solutions by laminating polyethylene sealant films onto polyethylene substrates. These single-class resin-based laminates offer improved sustainability because they can be easily recycled using conventional methods, and they also reduce manufacturing costs by using inexpensive polyethylene polymers. However, replacing conventional substrates with polyethylene substrates has been difficult because polyethylene substrates lack sufficient rigidity and poor heat resistance, making them unsuitable for withstanding faster packaging speeds in vertical foam-fill-seal (VFFS) lines and for surviving high temperatures in the top seal jaws. "Pure" polyethylene solutions typically tend to have inferior rigidity, heat resistance, and barrier performance, making them difficult to use in various FFS machines and different end applications. A major challenge is manufacturing complete PE laminates with the properties necessary for smooth operation on high-speed VFFS packaging machines where higher heat resistance is essential to avoid problems with film sticking to the seal jaws. Therefore, while "pure" polyethylene laminates are known, there is still a need to further improve the performance of such laminates, especially when the substrate is manufactured as an unoriented PE film.

[0004] International Patent Publication No. 2018 / 187438 describes a packaging laminate structure comprising a sealant film and a layered printed film with a thickness of 15 to 30 microns. The intermediate layer of the printed film has a density of 0.950 to 0.965 g / cm³. 3 The density and melt index (I2) of 0.1-20 g / 10 min contain at least 90% by weight of high-density polyethylene (HDPE), with both the inner and outer layers weighing 0.925-0.965 g / cm³. 3 It contains linear low-density polyethylene (LLDPE) having a density of . Details regarding SIT, optical properties, and mechanical properties, for both printed films and laminated structures, are not disclosed in this publication. [Prior art documents] [Patent Documents]

[0005] [Patent Document 1] International Patent Application Publication No. 2018 / 187438 [Overview of the project] [Problems that the invention aims to solve]

[0006] Therefore, the object of the present invention is to provide a polyethylene laminate film that is preferably manufactured from a conventional unoriented blown film (inflation film) or cast film, has good or even improved heat resistance and mechanical properties, exhibits excellent performance in high-speed VFFS operations, and simultaneously exhibits excellent sealing performance.

[0007] A further object of the present invention is to provide a polyethylene laminate film having good barrier properties without using additional barrier coating (e.g., metallization) procedures required for the intended use of the laminate film, particularly in packaging applications where moisture barrier is important.

[0008] A further object of the present invention is to provide a polyethylene laminate film that satisfies the aesthetic requirements for packaging films and has good optical properties (e.g., gloss and haze).

[0009] Finally, the present invention also aims to provide a polyethylene laminate film that includes a printed film having the characteristics (mechanical properties and heat resistance) required for high-speed printing operations and subsequent performance in packaging lines. [Means for solving the problem]

[0010] A combination of these objectives is achieved by the present invention, which is a polyethylene laminate film including an inner surface and an outer surface. a) A printed film comprising an outer layer E, a core layer F, and an inner layer G, wherein the inner layer G forms the outer surface of the laminate film, and the inner layer G has a density of 920-935 kg / m². 3 A printed film made of an inner layer G composition containing component AG, which is an ethylene copolymer having a density and a melt flow rate (MFR2) of 0.5 to 2.0 g / 10 min as measured according to ISO 1133; and b) A sealant film comprising an outer layer A, a core layer B, and an inner layer C, wherein the inner layer C forms the inner surface of the laminate film, and the inner layer C is made of an inner layer C composition comprising at least one ethylene polymer; Includes, The outer layer A of the sealant film is laminated to the outer layer E of the printing film. The present invention provides a polyethylene laminate film in which the seal onset temperature (SIT) at 5N on the outer surface of the laminate film is at least 10°C higher than the seal onset temperature at 5N on the inner surface of the laminate film, and the seal onset temperature is measured according to ASTM F 2029 and ASTM F 88.

[0011] The present invention is based on the finding that such polyethylene laminate films can be provided by a combination of a printed film and a sealant film, wherein the inner layer of the printed film contains a specially selected ethylene polymer, and the heat resistance properties of the outer layer of the laminate film are specially tuned.

[0012] The combination of the printed film and the inner layer of the sealant film in the polyethylene laminate film of the present invention solves the above-mentioned objectives.

[0013] The temperature difference between the two outer surfaces of the laminate film at the start of sealing is at least 10°C, and due to its excellent mechanical properties, the laminate film can be run at a packaging speed of 50-80 pouches / minute while achieving superior sealing behavior without any problems of sticking to the jaws on the sealing bar of the VFFS line.

[0014] This laminate film achieves excellent barrier properties without the need for barrier coating or metallization, and can be used without recyclability issues, especially in most packaging applications where moisture barriers are paramount.

[0015] While it is extremely difficult to improve the heat resistance of polyethylene film while maintaining good optical properties, this laminate film also features relatively high gloss and low haze. Therefore, the polyethylene laminate film of the present invention possesses all the properties desired for laminate films used in packaging applications.

[0016] Furthermore, the printed film of the laminate can be easily run on a high-speed printing press. [Brief explanation of the drawing]

[0017] [Figure 1] Figure 1 shows the structure of one embodiment of the laminate film of the present invention. [Figure 2] Figure 2 shows the sealing start temperature of the sealant film. [Figure 3] Figure 3 shows the sealing start temperature of the printed film. [Modes for carrying out the invention]

[0018] In the present invention, the polyethylene laminate film includes or comprises a sealant film and a printed film.

[0019] Printing film <Structure> The term "printing film" refers to a film containing layers that can be used for printing operations (such as high-speed printing processes). The film may be either a non-printing film or a printing film.

[0020] The printed film of the present invention comprises or consists of a plurality of layers, at least an outer layer E, a core layer F, and an inner layer G. The core layer F is located between the outer layers, i.e., the outer layer E and the inner layer G. Preferably, the outer layer E of the printed film is a printable layer or a printed layer, i.e., printing can be performed on the outer layer E of the printed film, preferably after a surface treatment (corona treatment).

[0021] The printed film also functions as a substrate (film) and contributes to the mechanical and / or optical properties of the laminate film. Therefore, in this disclosure, the terms “printed film” and “substrate film” or “substrate” are used synonymously. When laminated to the sealant film, the inner layer G forms the outer surface of the laminate film.

[0022] In one embodiment, the printed film comprises an outer layer E, a core layer F, and an inner layer G. In another embodiment, the printed film includes one or more further intermediate (or subskin) layers Y.

[0023] In certain embodiments, the printed film further includes one or more intermediate layers Y between the core layer F and the inner layers G, and between the core layer F and the outer layer E, for example, in a 5-layer film structure E / Y1 / F / Y2 / G or a 7-layer film structure E / Y1 / Y1 / F / Y2 / Y2 / G. Preferably, the printed film includes up to 9 layers, more preferably up to 7 layers.

[0024] If present, the intermediate layer Y preferably contains or consists of a composition similar to that of the adjacent layer. For this reason, the intermediate layer Y may have the composition of the core layer F, or the composition of the adjacent inner layer G or adjacent outer layer E.

[0025] Preferably, the printed film has a thickness of 15 to 40 μm, more preferably 20 to 38 μm, and most preferably 22 to 35 μm.

[0026] Preferably, the core layer F has a thickness of 30-80%, more preferably 35-75%, and most preferably 40-70% of the total thickness of the printed film.

[0027] The outer layer E and / or inner layer G preferably have a thickness of 10 to 35%, more preferably 15 to 30%, for example 25%, of the total film thickness. In the 5-layer film structure E / Y1 / F / Y2 / G, the inner layer G and / or outer layer E preferably have a thickness of 5 to 25%, more preferably 7.5 to 20%, of the total printed film thickness.

[0028] Preferably, the printed film is a "polyethylene film," i.e., a film containing or consisting of at least one type of ethylene polymer, which may be either a homopolymer or copolymer of ethylene. Preferably, the polyolefin film contains at least 90% by weight, more preferably at least 95% by weight, and most preferably at least 98% by weight of ethylene polymer, based on the total weight of the polyethylene film. Preferably, the polyethylene film contains 90-100% by weight, more preferably 95-100% by weight, and most preferably 98-100% by weight of ethylene polymer, based on the total weight of the polyethylene film. Most preferably, the polyethylene film consists solely of ethylene polymer. Preferably, the ethylene polymer contains or consists of any of the following: an ethylene homopolymer and / or a copolymer of ethylene and propylene and / or an α-olefin having 4-10 carbon atoms. Preferably, the polyethylene film does not contain non-polyolefin polymers, and more preferably does not contain non-polyethylene polymers. Particularly preferred is that the polyethylene film does not contain polyester or polyamide polymers. The use of polyethylene film provides a fully recyclable and sustainable packaging structure.

[0029] Generally, printing films are supplied as oriented films or unoriented films. An oriented film is a film that has been "stretched" after production. Oriented films are typically stretched by more than 300%, preferably more than 500%, in the machine direction (MD) and / or transverse direction (TD). Films stretched in the machine direction are often called "MDO" films. Films stretched in two directions are called "biaxially oriented polyethylene" (BOPE). An unoriented film is a blown film or cast film that has not been intentionally stretched (preferably more than 200%) after film production by any suitable means, namely subsequent heating and / or the use of rollers during film production.

[0030] Preferably, the printed film is an unoriented film. Preferably, the printed film is produced on a standard blown and / or cast film line through a standard film machinery system (nip roller or takeoff roller and winder) without the use of stretching equipment.

[0031] As understood within the scope of this disclosure, the printing film for layer preparation and each of its layer compositions may also include additives such as stabilizers, processing aids and / or pigments. Examples of such additives include antioxidants, UV stabilizers, acid scavengers, nucleating agents, antiblocking agents, slip agents, and polymer processing agents (PPAs). Additives may be present in the same or different amounts in only some or one of the layers of the film. Additives may be added to each layer composition during the preparation of the composition, or they may already be contained in any of the polymers used in the preparation of each layer composition.

[0032] Generally, each additive may be present in an amount of 0 to 5000 ppm based on the total weight of each layer composition used to prepare the layers of the film. Additives are generally available from several suppliers and are included in the composition as a single additive or as a mixture of two or more additives. Such compositions may generally be present in an amount of 0 to 5% by weight in the layer composition based on the weight of each layer composition used to prepare the layers of the film.

[0033] Generally, within the scope of this disclosure, percentages (%) are understood to mean weight percentages (weight%) unless otherwise specified.

[0034] <Composition> Each printed film layer is made of a composition containing at least one polymer component (e.g., polyethylene). If the composition contains multiple polymer components, it is a blend of these components. Additional compounds (such as additives like polymer processing aids, antiblocking agents, and slip agents) may be present in the composition.

[0035] Inner layer G The inner layer G is made of an inner layer G composition containing components that contribute particularly to the heat resistance and optical properties of the film. Furthermore, this layer also imparts mechanical properties to the film.

[0036] When laminating a sealant film, the inner layer G forms the outer surface of the laminate film. Since the printing film used in the laminate film is generally reverse-printed onto the outer layer, good optical properties are important for this layer.

[0037] By selecting ethylene polymer for the inner layer, it is possible to manufacture printing films ideal for high-speed printing operations, especially printing speeds exceeding 200 m / min.

[0038] Ingredient AG The inner layer G of the printing film is 920-935 kg / m². 3The inner layer G composition contains component AG, which is an ethylene copolymer having a density and a melt flow rate (MFR2) of 0.5 to 2.0 g / 10 min as measured according to ISO 1133.

[0039] Generally, ethylene polymers can be unimodal or multimodal, for example, bimodal. The "modality" of a polymer refers to the structure of its molecular weight distribution, i.e., the appearance of the curve showing the number of molecules as a function of molecular weight. If the curve shows a single maximum, the polymer is called "unimodal." If the curve shows a very broad maximum or two or more maximums, and the polymer consists of two or more fractions, the polymer is called "bimodal," "multimodal," etc. For example, if a polymer is produced in a sequential multistage process using series-connected reactors with different conditions in each reactor, the polymer fractions produced in the different reactors will each have their own molecular weight distribution and weight-average molecular weight. When the molecular weight distribution curves of such polymers are recorded, the individual curves from these fractions are superimposed on the molecular weight distribution curve of the overall polymer product, usually resulting in a curve with two or more distinct maximums.

[0040] In the production of monomodulus ethylene polymers, the ethylene polymer is manufactured in a reactor under specific conditions regarding monomer composition, hydrogen gas pressure, temperature, and pressure. As comonomers, other olefins with up to 12 carbon atoms, such as α-olefins with 3 to 12 carbon atoms, such as propene, 1-butene, 4-methyl-1-pentene, 1-hexene, 1-octene, and 1-decene, are commonly used in the copolymerization of ethylene.

[0041] For example, in the production of bimodal ethylene polymers, a first ethylene polymer is produced in a first reactor under constant conditions regarding monomer composition, hydrogen gas pressure, temperature, and pressure. After polymerization in the first reactor, the reaction mixture containing the resulting polymer is supplied to a second reactor, where further polymerization takes place under different conditions. Typically, a first polymer with a high melt flow rate (low molecular weight) and a moderate, low, or no comonomer is produced in the first reactor, while a second polymer with a low melt flow rate (high molecular weight) and a high comonomer is produced in the second reactor. The resulting final product consists of a close mixture of polymers from the two reactors, and the different molecular weight distribution curves of these polymers form a molecular weight distribution curve with a broad maximum or two maxima. In other words, the final product is a bimodal polymer mixture.

[0042] Preferably, component AG is a multimodal ethylene copolymer, more preferably a bimodal ethylene copolymer, and even more preferably ethylene and at least two different C4-C 12 It is a copolymer, or terpolymer, of α-olefin monomers.

[0043] Preferably, the multimodal terpolymer comprises or consists of a multimodal polymer of ethylene and at least two different comonomers selected from α-olefins having 4 to 10 carbon atoms, with a specific MFR of 13 to 30. 21 It has MFR2 and MWD of 6 or less.

[0044] Such multimodal ethylene polymers are disclosed, for example, in International Publication No. WO 2016 / 083208. Regarding the definitions of these ethylene polymers (such as the "modality" of the polymer) and the production methods, reference is made to International Publication No. WO 2016 / 083208. Further, all embodiments and preferred embodiments of ethylene polymers having the required density as described in International Publication No. WO 2016 / 083208 are preferred embodiments of the multimodal ethylene polymer of Component AG in the present invention, whether or not they are explicitly described herein.

[0045] The multimodal ethylene polymer preferably has an MFR2 in the range of 0.5 to 2.5 g / 10 min, particularly preferably 1.0 to 1.8 g / 10 min. Preferably, the multimodal ethylene polymer has a density exceeding 922 to 933 kg / m 3 and more preferably 923 to 930 kg / m 3 The multimodal ethylene polymer preferably has a ratio MFR 21 / MFR2 of 13 to 30, more preferably 15 to 25.

[0046] At least two α-olefin comonomers having 4 to 10 carbon atoms in the multimodal ethylene polymer are preferably 1-butene and 1-hexene. Preferably, the total amount of comonomers present in the multimodal ethylene polymer is 0.5 to 10 mol%, preferably 1.0 to 8 mol%, more preferably 1.0 to 5 mol%, and even more preferably 1.1 to 4.0 mol%.

[0047] The multimodal ethylene polymer, which is preferably a bimodal terpolymer, preferably comprises and consists of an ethylene polymer component (A1) and an ethylene polymer component (B1), and the ethylene polymer component (A1) has a higher MFR2 than the ethylene polymer component (B1).

[0048] More preferably, the ethylene polymer component (A1) has an MFR2 of 1 to 50 g / 10 min, preferably 1 to 40 g / 10 min, more preferably 1 to 30 g / 10 min, more preferably 2 to 20 g / 10 min, more preferably 2 to 15 g / 10 min, and even more preferably 2 to 10 g / 10 min.

[0049] The ratio of MFR2 of ethylene polymer component (A1) to MFR2 of ethylene polymer component (B1) is 2 to 50, preferably 5 to 40, more preferably 10 to 30, even more preferably 10 to 25, and still more preferably 11 to 25.

[0050] Preferably, the ethylene polymer component (A1) contains a comonomer different from that of the ethylene polymer component (B1). Preferably, the ethylene polymer component (A1) has a smaller amount of comonomers (mol%) than the ethylene polymer component (B1), and more preferably, the ratio of [the amount of α-olefin comonomers having 4 to 10 carbon atoms present in the ethylene polymer component (A1) (mol%)] to [the amount of at least two α-olefin comonomers having 4 to 10 carbon atoms in the final multi-modal polymer of ethylene (mol%)] is 0.2 to 0.6, preferably 0.25 to 0.5.

[0051] Preferably, the α-olefin comonomer having 4 to 10 carbon atoms in the ethylene polymer component (A1) is 1-butene, and the α-olefin comonomer having 4 to 10 carbon atoms in the ethylene polymer component (B1) is 1-hexene. Particularly preferred is that the bimodal terpolymer is prepared by two or more polymerization steps, in which a lower α-olefin comonomer (e.g., 1-butene) is introduced by slurry polymerization in a loop reactor, and a higher α-olefin comonomer (1-hexene) is introduced by gas-phase polymerization in a gas-phase reactor.

[0052] Preferably, the ethylene polymer component (A1) has a different density from that of the ethylene polymer component (B1), and preferably a higher density. The density of the ethylene polymer component (A1) is preferably 925 to 950 kg / m³. 3More preferably 930-945 kg / m 3 That is the case.

[0053] Preferably, the multimodal ethylene terpolymer comprises ethylene polymer component (A1) in an amount of 30-70% by weight, preferably 40-60% by weight, more preferably 35-50% by weight, and more preferably 40-50% by weight, based on the total amount of ethylene polymer (100% by weight), and ethylene polymer component (B1) in an amount of 70-30% by weight, preferably 60-40% by weight, more preferably 65-50% by weight, and more preferably 60-50% by weight.

[0054] Most preferably, the multimodal ethylene terpolymer consists of single polymer components of ethylene polymer components (A1) and (B1). Therefore, the ratio of ethylene polymer component (A1) to ethylene polymer component (B1) is (30-70):(70-30), preferably (40-60):(60-40), more preferably (35-50):(65-50), and more preferably (40-50):(60-50).

[0055] In a particularly preferred embodiment, the multimodal terpolymer is a bimodal terpolymer, i.e., comprising a low molecular weight component and a high molecular weight component, with MFR2 of 1.0 to 1.8 g / 10 min and / or MFR5 of 2.8 to 4.5 g / 10 min and / or MFR5 of 20 to 36 g / 10 min 21 , and / or 925~929 kg / m 3 Densities exceeding , and / or molecular weight distribution of 3.0-5.0 (M w / M n ), and / or 15-25 kg / mol M n , and / or M 70-125 kg / mol w , and / or MFR 15-25 21 / MFR2 ratio (FRR 21 / 2 ), and / or MFR 6-9 21 / MFR5 ratio (FRR 21 / 5 ) is present. All molecular weight parameters are measured by the conventional GPC method with standard calibration, as detailed below.

[0056] As the AG component, you can use Anteo® FK2715 resin manufactured by Borealis or Borouge.

[0057] Preferably, component AG is present in the inner layer G composition in an amount of 40-80% by weight, more preferably 50-75% by weight, and most preferably 55-70% by weight, based on the total weight of the inner layer G composition.

[0058] In addition to component AG, the inner layer G composition may contain further components different from component AG.

[0059] Components BG1 and BG2 The inner layer G composition may further contain components BG1 and / or BG2.

[0060] Preferably, component BG1 is 915-930 kg / m³ 3 It is a linear low-density ethylene polymer (LLDPE) having a density and a melt flow rate (MFR2) of 0.05 to 1.0 g / 10 min as measured according to ISO 1133.

[0061] Such LLDPEs are well known in the art and are usually produced by a catalyst-assisted polymerization process. The LLDPE of component BG1 is preferably a multimodal LLDPE, and more preferably a bimodal LLDPE. Such multimodal LLDPEs and their production are described, for example, on pages 9-12 of International Publication No. 2004 / 000933, referenced.

[0062] The LLDPE of component BG1 is preferably 920-928 kg / m³ 3 More preferably 920-925 kg / m 3 It has a density of .

[0063] Preferably, the LLDPE of component BG1 is an ethylene copolymer. The comonomer may be an α-olefin having 4 to 12 carbon atoms, such as 1-butene, 4-methyl-l-pentene, 1-hexene, 1-octene, or 1-decene. More preferably, the LLDPE is a copolymer of ethylene and 1-butene or 1-hexene, and most preferably a copolymer of ethylene and 1-butene.

[0064] Preferably, the total amount of comonomers present in the LLDPE of component BG1 is 2.0 to 6.0 mol%, more preferably 2.5 to 5.5 mol%, and most preferably 3.0 to 5.2 mol%.

[0065] Preferably, the LLDPE of component BG1 has an MFR2 of 0.1 to 0.5 g / 10 min, more preferably 0.15 to 0.4 g / 10 min, and most preferably 0.20 to 0.30 g / 10 min.

[0066] Component BG1 preferably has a lower density and / or a lower melt flow rate (MFR2) than component AG.

[0067] In a particularly preferred embodiment, the LLDPE of component BG1 is 0.20-0.30 g / 10 min MFR2, and / or 0.80-1.2 g / 10 min MFR5, and / or 18-26 g / 10 min MFR 21 , and / or 920~925 kg / m 3 The density and / or molecular weight distribution (MWD) of 10-24 and / or M10-15 kg / mol n , and / or M 150-250 kg / mol w , and / or MFR 80-110 21 / MFR2 ratio (FRR 21 / 2 ), and / or MFR 18-26 21 / MFR5 ratio (FRR 21 / 5 ) is present. All molecular weight parameters are measured by the conventional GPC method with standard calibration, as detailed below.

[0068] For component BG1, Borstar FB2230 or FB2235 resins from Borealis or Borouge can be used as LLDPE.

[0069] Preferably, the component BG2 is 950-970 kg / m³ 3 It is a high-density ethylene polymer (HDPE) with a density and a melt flow rate (MFR2) of 0.2 to 2.0 g / 10 min as measured according to ISO 1133.

[0070] HDPE is well known in the field and is usually produced by a polymerization process using a catalyst.

[0071] The HDPE of component BG2 is preferably a multimodal HDPE, and more preferably a bimodal HDPE.

[0072] The HDPE of component BG2 is preferably 955-968 kg / m³ 3 More preferably 958-965 kg / m 3 It has a density of such multimodal HDPE and the manufacture thereof is described, for example, on pages 19-28 of the International Patent Application Publication No. 2020 / 109289, referenced.

[0073] Preferably, HDPE is a copolymer. Ethylene copolymer is a polymer comprising an ethylene monomer and one or more comonomers. The comonomers may be α-olefins having 4 to 12 carbon atoms, such as 1-butene, 4-methyl-1-pentene, 1-hexene, 1-octene, or 1-decene. More preferably, HDPE is a copolymer of ethylene and 1-butene, 1-hexene, or 1-octene, and most preferably a copolymer of ethylene and 1-butene.

[0074] Preferably, the total amount of comonomers present in the HDPE is 0.0 to 0.40 mol%, more preferably 0.01 to 0.30 mol%, and most preferably 0.02 to 0.20 mol%.

[0075] Preferably, the HDPE of component BG2 has an MFR2 of 0.25 to 1.8 g / 10 min, more preferably 0.3 to 1.5 g / 10 min, even more preferably 0.4 to 1 g / 10 min, and most preferably 0.5 to 0.9 g / 10 min.

[0076] In a particularly preferred embodiment, the HDPE of component BG2 is 0.5 to 0.9 g / 10 min MFR2, and / or 2.0 to 3.5 g / 10 min MFR5, and / or 30 to 50 g / 10 min MFR 21 , and / or 958~965 kg / m 3 The density and / or molecular weight distribution (MWD) of 10-15, and / or M7-12 kg / mol n , and / or M 100-165 kg / mol w , and / or MFR 50-75 21 / MFR2 ratio (FRR 21 / 2), and / or 10-25 MFR 21 / MFR5 ratio (FRR 21 / 5 ) is present. All molecular weight parameters are measured by the conventional GPC method with standard calibration, as detailed below.

[0077] Borstar FB5600 resin from Borouge can be used as the HDPE for component BG2.

[0078] Preferably, component BG1 and / or BG2 are present in the inner layer G composition in an amount of 15 to 45% by weight, more preferably 20 to 40% by weight, based on the total weight of the inner layer G composition.

[0079] Ingredient CG The inner layer G composition may further contain component CG. Preferably, component CG is low-density ethylene polymer (LDPE), and more preferably 918 kg / m³. 3 ~928 kg / m 3 This LDPE has a density in the range of [value missing] and a melt flow rate (MFR2) in the range of 1.5 to 2.5 g / 10 min, as measured according to ISO 1133.

[0080] LDPE is well known in the art and is typically produced by a high-pressure process carried out in a tubular reactor or autoclave.

[0081] LDPE and its manufacture are described, for example, on pages 9, line 29 to page 12, line 6 of International Publication No. 2017 / 055174, referenced.

[0082] The LDPE of component CG is preferably 918-928 kg / m³ 3 More preferably 919-927 kg / m 3 Most preferably 920-925 kg / m³ 3 It has a density of .

[0083] Preferably, the LDPE of component CG has an MFR2 of 1.6 to 2.4 g / 10 min.

[0084] In a particularly preferred embodiment, the LDPE of component CG has an MFR2 of 1.6 to 2.4 and / or 920 to 925 kg / m³. 3 Density, and / or MWD of 5.5-9, and / or M12-18 kg / mol n , and / or M 80-130 kg / mol w It has the following properties. All molecular weight parameters are measured by the GPC viscosity method with standard calibration, as will be further detailed below.

[0085] For the CG component, FT6230 or FT6236 resins from Borealis or Borouge can be used as LDPE.

[0086] Preferably, component CG is present in the inner layer G composition in an amount of 5 to 15% by weight, more preferably 7 to 13% by weight, based on the total weight of the inner layer G composition.

[0087] In one embodiment, the inner layer G composition comprises or consists of components AG and BG1, and optionally CG, in any of the embodiments described above.

[0088] In another embodiment, the inner layer G composition comprises or consists of components AG and BG2, and optionally CG, in any of the embodiments described above.

[0089] In further embodiments, the inner layer G composition comprises or consists of components AG, BG1 and BG2, and optionally CG, in any of the embodiments described above.

[0090] In a preferred embodiment, the inner layer G composition comprises, based on the total weight of the inner layer G composition, 50 to 75% by weight of component AG, 25 to 40% by weight of either component BG1 or BG2, and optionally 0 to 15% by weight of component CG.

[0091] Generally, component AG contributes to the relatively high seal initiation temperature and the good optical properties of the printed film. Components BG1 and BG2 further contribute to the high seal initiation temperature without affecting the optical properties of the printed film.

[0092] Core layer F The core layer F composition of the printing film is made up of a core layer F that contains components that contribute to the rigidity of the film necessary for the film extrusion process and, moreover, the printing operation, especially high-speed printing operation.

[0093] Ingredients AF The core layer F composition may contain component AF. Preferably, component AF is high-density ethylene polymer (HDPE), and preferably 950-970 kg / m³, as described for component BG2 of the inner layer G composition. 3 It has a density in the range of and a melt flow rate (MFR2) in the range of 0.2 to 2.0 g / 10 min, as measured according to ISO 1133.

[0094] All embodiments described for component BG2 are embodiments of component AF. Component AF can be independently selected from any one of these embodiments, and the selected embodiment may be the same or different with respect to AF and BG2.

[0095] Preferably, component AF is present in the core layer F composition in an amount of up to 90% by weight, preferably 50-90% by weight, more preferably 60-88% by weight, and most preferably 70-87% by weight, based on the total weight of the core layer F composition.

[0096] The AF component imparts high rigidity to the printing film.

[0097] Ingredient BF The core layer F composition may contain component BF. Preferably, component BF is an ethylene copolymer, and preferably, as described for component AG of the inner layer G composition, in a density of 920-935 kg / m². 3 It has a density and a melt flow rate (MFR2) of 0.5–2.0 g / 10 min as measured according to ISO 1133.

[0098] All embodiments described for component AG are embodiments of component BF. Component BF can be independently selected from any one of these embodiments, and the selected embodiment may be the same or different with respect to BF and AG.

[0099] Preferably, component BF is present in the core layer F composition in an amount of 5 to 40% by weight, more preferably 10 to 35% by weight, based on the total weight of the core layer F composition.

[0100] In one embodiment, the core layer F is made of a core layer F composition comprising or consisting of components AF and BF, selected from any one of the embodiments described above.

[0101] In a preferred embodiment, based on the total weight of the core layer F composition, component AF is present in the core layer F composition in an amount of 50-90% by weight, more preferably 70-87% by weight, and component BF is present in an amount of 10-50% by weight, more preferably 13-30% by weight.

[0102] outer layer E The outer layer E of the printed film is made of an outer layer E composition containing components that contribute particularly to the heat resistance, mechanical properties, and optical properties of the film. The outer layer E is preferably the printing layer of the film or the printable layer of the film. In a laminate film, the outer layer E may be placed between the core layer F and the outer layer A of the sealant film.

[0103] Ingredient AE The outer layer E composition may contain component AE. Preferably, component AE is an ethylene copolymer, and preferably, as described for component AG of the inner layer G composition, in a concentration of 920-935 kg / m³. 3 It has a density and a melt flow rate (MFR2) in the range of 0.5 to 2.0 g / 10 min, as measured according to ISO 1133.

[0104] All embodiments described for component AG are embodiments of component AE. Component AE can be independently selected from any one of these embodiments, and the selected embodiment may be the same or different with respect to AE and AG.

[0105] In one embodiment, components AE and AG, and optionally BF, are identical.

[0106] Preferably, component AE is present in the outer layer E composition in an amount of 40-80% by weight, more preferably 50-75% by weight, and most preferably 55-70% by weight, based on the total weight of the outer layer E composition.

[0107] Ingredient BE The outer layer E composition may contain component BE. Preferably, component BE is a linear low-density ethylene polymer (LLDPE), and more preferably, as described for component BG1 of the inner layer G composition, in a quantity of 915-930 kg / m³. 3 It has a density and a melt flow rate (MFR2) of 0.05 to 1.0 g / 10 min, as measured according to ISO 1133.

[0108] All embodiments described for component BG1 are embodiments of component BE. Component BE can be independently selected from any one of these embodiments, and the selected embodiment may be the same or different with respect to BE and BG1.

[0109] Preferably, component BE is present in the outer layer E composition in an amount of 15 to 40% by weight, more preferably 20 to 40% by weight, based on the total weight of the outer layer E composition.

[0110] Ingredients CE The outer layer E composition may contain component CE. Preferably, component CE is low-density ethylene polymer (LDPE), and preferably 918 kg / m³ as described for component CG of the inner layer G composition. 3 ~928 kg / m 3 It has a density in the range of and a melt flow rate (MFR2) in the range of 1.5 to 2.5 g / 10 min as measured according to ISO 1133.

[0111] All embodiments described for component CG are embodiments of component CE. Component CE can be independently selected from any one of these embodiments, and the selected embodiment may be the same or different with respect to CE and CG.

[0112] Preferably, component CE is present in the outer layer E composition in an amount of 5 to 15% by weight, more preferably 7 to 13% by weight, based on the total weight of the outer layer E composition.

[0113] In one embodiment, the outer layer E composition comprises or consists of components AE and BE, and optionally CE, in any of the embodiments described above.

[0114] In one embodiment, the outer layer E composition comprises or consists of the same polymer components (e.g., AG, BG1, and optionally CG) as the inner layer G composition.

[0115] In a preferred embodiment, the outer layer E composition comprises or consists of 50 to 75% by weight of component AE, 25 to 40% by weight of component BE, and optionally 0 to 15% by weight of component CE, based on the total weight of the outer layer E composition.

[0116] <Characteristics> This printed film features excellent optical properties (haze and gloss), high rigidity (e.g., tensile modulus of 500-1000 MPa), and high heat resistance (e.g., SIT of 110-120°C). These are achieved particularly by using component AG in the printed film. Components BG1 and / or BG2 also contribute to improved properties, especially high rigidity and / or SIT, without sacrificing the optical properties (i.e., gloss and haze) of the printed film.

[0117] sealant film <Structure> The term "sealant film" refers to a film that contains a sealing layer, which is a layer that facilitates adhesion to other films, layers, or articles.

[0118] The sealant film of the present invention comprises or consists of several layers, which are at least an outer layer A, a core layer B, and an inner layer C. The core layer B is located between the outer layers, i.e., outer layer A and inner layer C, and preferably, inner layer C is the sealing layer. When laminated to a printing film, inner layer C forms the inner surface of the laminate film.

[0119] In one embodiment, the sealant film comprises an outer layer A, a core layer B, and an inner layer C. In another embodiment, the sealant film includes one or more further intermediate (or subskin) layers X.

[0120] In certain embodiments, the sealant film further includes, for example, a 5-layer film structure A / X1 / B / X2 / C or a 7-layer film structure A / X1 / X1 / B / X2 / X2 / C, one or more intermediate layers X between the core layer B and the inner layer C, and between the core layer B and the outer layer A. Preferably, the sealant film includes up to 9 layers, more preferably up to 7 layers.

[0121] If present, the intermediate layer X preferably contains or consists of a composition similar to that of the adjacent layer, so the composition may be the composition of the core layer B, or the composition of the adjacent inner layer C or the adjacent outer layer A.

[0122] Preferably, the sealant film has a thickness of 35 to 120 μm, more preferably 40 to 110 μm, and most preferably 40 to 100 μm.

[0123] In the sealant film, the core layer B preferably has a thickness of 30-80%, more preferably 35-75%, and most preferably 40-70% of the total thickness of the sealant film.

[0124] The outer layer A and / or inner layer C preferably have a thickness of 10 to 35%, more preferably 15 to 30%, for example 25%, of the total thickness of the sealant film. In the 5-layer film structure A / X1 / B / X2 / C, the inner layer C and / or outer layer A preferably have a thickness of 5 to 20%, more preferably 7.5 to 15%, of the total thickness of the sealant film.

[0125] Preferably, the sealant film is a "polyethylene film" as defined above for the printing film.

[0126] The sealant film and the composition of each layer for its preparation may contain the same types and amounts of additives as those described for the printed film.

[0127] Preferably, the sealant film is an unoriented film, and the orientation is defined above with respect to the printed film.

[0128] <Composition> Each sealant film layer is made of a composition containing at least one polymer (e.g., polyethylene) component. If the composition contains multiple polymer components, it is a blend of these components. Additional compounds (additives such as polymer processing aids, antiblocking agents, or slip agents) may be present in the composition.

[0129] Inner layer C The inner layer C is made of an inner layer C composition containing components that contribute particularly to the heat seal performance and optical properties of the film. The inner layer C composition contains at least one ethylene-based polymer. When laminated to a printed film, the inner layer C forms the inner surface of the laminate film. The inner layer C of the sealant film is preferably a sealing layer.

[0130] Component AC Preferably, the inner layer C of the sealant film has a density of 915-925 kg / m². 3 It is made of an inner layer C composition containing component AC, which is a linear low-density ethylene polymer (LLDPE) having a density and a melt flow rate (MFR2) of 0.5 to 2.0 g / 10 min as measured according to ISO 1133.

[0131] The density of component AC is preferably at least 3 kg / m³ higher than the density of component AG. 3 , more preferably at least 5 kg / m 3 low.

[0132] LLDPE is well known in this field and is produced by a catalyst-assisted polymerization process.

[0133] Preferably, component AC is a multimodal ethylene copolymer, more preferably a bimodal ethylene copolymer, and even more preferably ethylene and at least two different C4-C4 copolymers. 12It is a copolymer, or terpolymer, of α-olefin monomers.

[0134] Preferably, the ethylene copolymer has a specific MFR of 13 to 30. 21 / MFR2 and / or MWD of 6 or less

[0135] Preferably, the ethylene copolymer comprises or consists of a multimodal polymer of ethylene and one or more comonomers selected from α-olefins having 4 to 10 carbon atoms, with a specific MFR of 13 to 30. 21 It has / MFR2 and MWD of 6 or less.

[0136] Such multimodal ethylene copolymers are disclosed, for example, in International Publication No. 2016 / 083208.

[0137] The multimodal ethylene copolymer preferably has an MFR2 of 0.6 to 2.0 g / 10 min, and particularly preferably 1.2 to 1.8 g / 10 min.

[0138] Preferably, the multimodal ethylene copolymer has a density of 910-925 kg / m³. 3 More preferably 913-922 kg / m 3 It has a density of 915-920 kg / m³, and is particularly preferably 915-920 kg / m³. 3 That is the case.

[0139] The multimodal ethylene copolymer preferably has a specific MFR of 13 to 30, more preferably 15 to 25. 21 It has / MFR2.

[0140] The multimodal ethylene copolymer preferably has a MWD of 6 or less, usually greater than 1, and more preferably 3 to 5.

[0141] The α-olefin comonomer having 4 to 10 carbon atoms in the multimodal ethylene copolymer is preferably 1-butene and / or 1-hexene.

[0142] Preferably, the total amount of comonomers present in the multimodal ethylene copolymer is 0.5 to 10 mol%, preferably 1 to 8 mol%, more preferably 1 to 5 mol%, even more preferably 1.5 to 5 mol%, and most preferably 2.5 to 4 mol%.

[0143] In a preferred embodiment, the multimodal ethylene copolymer is a bimodal copolymer, i.e., comprising a low molecular weight component and a high molecular weight component, with MFR2 of 1.2 to 1.8 g / 10 min and / or MFR5 of 3.0 to 5.0 g / 10 min and / or MFR5 of 20 to 40 g / 10 min 21 , and / or 916-920 kg / m 3 The density, and / or molecular weight distribution (MWD) of 3-5, and / or M15-25 kg / mol n , and / or M 80-115 kg / mol w , and / or MFR 15-25 21 / MFR2 ratio (FRR 21 / 2 ), and / or MFR 6-9 21 / MFR5 ratio (FRR 21 / 5 ) has.

[0144] In a more preferred embodiment, the ethylene copolymer of component AC comprises or consists of an ethylene terpolymer, more preferably a multimodal ethylene terpolymer (II).

[0145] Preferably, the multimodal ethylene terpolymer (II) is 910 kg / m³ 3 ~925 kg / m 3 It is an ethylene terpolymer having a density and an MFR2 of 0.5 to 2.0 g / 10 min.

[0146] The multimodal ethylene terpolymer (II) preferably comprises or consists of a multimodal polymer of ethylene and at least two different comonomers selected from α-olefins having 4 to 10 carbon atoms, with a specific MFR of 13 to 30. 21 It has / MFR2 and MWD of 5 or less.

[0147] Such multimodal ethylene terpolymers are disclosed, for example, in International Publication No. 2016 / 083208. For definitions of these ethylene terpolymers (such as the "modality" of the polymer) and methods of production, refer to International Publication No. 2016 / 083208. Furthermore, 910-925 kg / m³ 3 All embodiments and preferred embodiments of ethylene terpolymers having densities in the range described in International Publication No. 2016 / 083208 are also preferred embodiments of the multimodal ethylene terpolymer (II) in this disclosure, whether or not they are expressly described herein.

[0148] The multimodal ethylene terpolymer (II) preferably has an MFR2 of 0.6 to 2.0 g / 10 min, and particularly preferably 1.2 to 1.8 g / 10 min.

[0149] Preferably, the multimodal ethylene terpolymer (II) has a density of 910-925 kg / m³. 3 More preferably 913-922 kg / m 3 It has a density of 915-920 kg / m³, and is particularly preferably 915-920 kg / m³. 3 That is the case.

[0150] The multimodal ethylene terpolymer (II) has a specific MFR of preferably 13-30, more preferably 15-25. 21 It has / MFR2.

[0151] The multimodal ethylene terpolymer (II) contains at least two α-olefin comonomers having 4 to 10 carbon atoms, preferably 1-butene and 1-hexene.

[0152] Preferably, the total amount of comonomers present in the multimodal ethylene terpolymer (II) is 0.5 to 10 mol%, more preferably 1 to 8 mol%, even more preferably 1 to 5 mol%, still more preferably 1.5 to 5 mol%, and most preferably 2.5 to 4 mol%.

[0153] The multimodal ethylene terpolymer (II), which is preferably a bimodal terpolymer, preferably comprises or consists of an ethylene polymer component (A1) and an ethylene polymer component (B1), wherein the ethylene polymer component (A1) has a higher MFR2 than the ethylene polymer component (B1).

[0154] Preferably, the ethylene polymer component (A1) has an MFR2 of 1 to 50 g / 10 min, more preferably 1 to 40 g / 10 min, even more preferably 1 to 30 g / 10 min, still more preferably 2 to 20 g / 10 min, still still more preferably 2 to 15 g / 10 min, and most preferably 2 to 10 g / 10 min.

[0155] The ratio of MFR2 of ethylene polymer component (A1) to MFR2 of ethylene polymer component (B1) 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.

[0156] Preferably, the ethylene polymer component (A1) contains a comonomer different from the ethylene polymer component (B1).

[0157] Preferably, the ethylene polymer component (A1) has a smaller amount of comonomers (mol%) than the ethylene polymer component (B1), and more preferably, the ratio of [amount of α-olefin comonomers having 4 to 10 carbon atoms present in the ethylene polymer component (A1) (mol%)] to [amount of at least two types of α-olefin comonomers having 4 to 10 carbon atoms in the final multimodal ethylene terpolymer (mol%)] is 0.10 to 0.60, preferably 0.15 to 0.50.

[0158] Preferably, the α-olefin comonomer having 4 to 10 carbon atoms in the ethylene polymer component (A1) is 1-butene, and the α-olefin comonomer having 4 to 10 carbon atoms in the ethylene polymer component (B1) is 1-hexene.

[0159] Preferably, the ethylene polymer component (A1) has a density different from, and preferably higher than, the density of the ethylene polymer component (B1).

[0160] The density of the ethylene polymer component (A1) is preferably 925 to 950 kg / m³. 3 More preferably 930-945 kg / m 3 That is the case.

[0161] Preferably, the multimodal ethylene terpolymer (II) comprises ethylene polymer component (A1) in an amount of 30-70% by weight, more preferably 40-60% by weight, even more preferably 35-50% by weight, and still more preferably 40-50% by weight, based on the total amount (100% by weight) of the multimodal ethylene terpolymer (II); and ethylene polymer component (B) in an amount of 70-30% by weight, more preferably 60-40% by weight, even more preferably 50-65% by weight, and still more preferably 50-60% by weight.

[0162] Most preferably, the multimodal ethylene terpolymer (II) consists of homopolymer components of ethylene polymer components (A1) and (B1). Therefore, the ratio of ethylene polymer component (A1) to ethylene-based polymer component (B1) is (30-70):(70-30), preferably (40-60):(60-40), more preferably (35-50):(65-50), and even more preferably (40-50):(50-60).

[0163] In a particularly preferred embodiment, the multimodal ethylene terpolymer (II) is a bimodal terpolymer, i.e., comprising a low molecular weight component and a high molecular weight component, with MFR2 of 1.2 to 1.8 g / 10 min and / or MFR5 of 3.0 to 5.0 g / 10 min and / or MFR5 of 20 to 40 g / 10 min 21 , and / or 915-920 kg / m 3 The density, and / or molecular weight distribution (MWD) of 3.0-5.0, and / or M15-25 kg / mol n , and / or M 80-115 kg / mol wand / or an MFR of 15 to 25 21 / MFR2 ratio (FRR 21 / 2 ) and / or an MFR of 6 to 9 21 / MFR5 ratio (FRR 21 / 5 ).

[0164] As the multimodal ethylene copolymer (II), commercially available products such as Borealis or Borouge's Anteo™, particularly Anteo™ FK1828 or Anteo™ FK1820, which have the required properties herein, are also preferred.

[0165] Preferably, component AC is present in the inner layer C composition in an amount of 50 to 95% by weight, more preferably 60 to 90% by weight, and most preferably 70 to 85% by weight, based on the total weight of the inner layer C composition.

[0166] Component AC is particularly suitable for imparting a low seal start temperature to the sealant film while maintaining good optical properties.

[0167] Component BC The inner layer C composition can contain component BC. Preferably, component BC is a low-density ethylene polymer (LDPE), and preferably has a density of 918 to 928 kg / m 3 and a melt flow rate (MFR2) of 1.5 to 2.5 g / 10 min measured according to ISO 1133.

[0168] All embodiments described for component CG are embodiments of component BC. Component BC can be independently selected from any one of these embodiments, and the selected embodiment may be the same as or different from that for BC and CG.

[0169] Preferably, component BC is present in the inner layer C composition in an amount of 5 to 50% by weight, more preferably 10 to 30% by weight, based on the total weight of the inner layer C composition.

[0170] In one embodiment, the inner layer C composition comprises, or consists of, component AC and component BC in any of the above embodiments.

[0171] In a preferred embodiment, the inner layer C composition comprises, or consists of, component AC in an amount of 50 to 95% by weight, preferably 70 to 85% by weight, and component BC in an amount of 5 to 50% by weight, preferably 15 to 30% by weight, based on the total weight of the inner layer C composition.

[0172] Core layer B The core layer B of the sealant film comprises a core layer B composition containing components that contribute particularly to the film's rigidity and other mechanical properties such as dirt impact and tear resistance.

[0173] Component AB The core layer B composition can contain component AB. Preferably, component AB is a medium-density ethylene polymer (MDPE), preferably having a density of 925 to 945 kg / m 3 and a melt flow rate (MFR2) of 0.05 to 0.50 g / 10 min measured according to ISO 1133.

[0174] Such MDPEs are also well known in the art and are usually produced by a polymerization process using a catalyst.

[0175] The MDPE of component AB is preferably a multimodal MDPE, more preferably a bimodal MDPE. Such multimodal MDPEs and their production are described, for example, in WO 2017 / 021389, pages 8 - 10, which is incorporated by reference.

[0176] Preferably, the MDPE of component AB has a density of 930 to 940 kg / m 3 and more preferably 932 to 938 kg / m 3 Preferably, the density of component AB is higher than that of component AC.

[0177] Preferably, the MDPE of component AB is an ethylene copolymer. The comonomer may be an α-olefin having 4 to 12 carbon atoms, such as 1-butene, 4-methyl-1-pentene, 1-hexene, 1-octene, or 1-decene. More preferably, the MDPE is a copolymer of ethylene and 1-butene or 1-hexene, and most preferably a copolymer of ethylene and 1-butene.

[0178] Preferably, the total amount of comonomers present in the MDPE of component AB is 1.0 to 4.0 mol%, more preferably 1.5 to 3.5 mol%, and most preferably 2.0 to 3.2 mol%.

[0179] Preferably, the MDPE of component AB has an MFR2 of 0.06 to 0.35 g / 10 min, more preferably 0.08 to 0.30 g / 10 min, and most preferably 0.10 to 0.20 g / 10 min.

[0180] Preferably, the MDPE of component AB has an MFR5 of 0.35 to 1.20 g / 10 min, more preferably 0.37 to 1.00 g / 10 min, and most preferably 0.40 to 0.80 g / 10 min.

[0181] In a particularly preferred embodiment, the MDPE of component AB is 0.10-0.20 g / 10 min MFR2 and / or 0.40-0.80 g / 10 min MFR5 and / or 10-20 g / 10 min MFR 21 , and / or 932-938 kg / m 3 The density and / or molecular weight distribution (MWD) of 15-35 and / or M 8-12 kg / mol n , and / or 150-280 kg / mol M w , and / or MFR 80-150 21 / MFR2 ratio (FRR 21 / 2 ), and / or 20-30 MFR 21 / MFR5 ratio (FRR 21 / 5 ) is present. All molecular weight parameters are measured by the conventional GPC method with standard calibration, as detailed below.

[0182] For component AB, Borstar FB1350 resin manufactured by Borealis or Borouge can be used as the MDPE.

[0183] Preferably, component AB is present in the core layer B composition in an amount of 35-80% by weight, more preferably 40-75% by weight, and most preferably 50-70% by weight, based on the total weight of the core layer B composition.

[0184] Components AB provide particularly high rigidity to core layer B.

[0185] Ingredients BB The core layer B composition may contain component BB. Preferably, component BB is a linear low-density ethylene polymer (LLDPE), and preferably, like component AC of the inner layer C composition, has a density of 915-925 kg / m³. 3 It has a density and a melt flow rate (MFR2) of 0.5–2.0 g / 10 min as measured according to ISO 1133.

[0186] All embodiments described for component AC are embodiments of component BB. Component BB can be independently selected from any one of these embodiments, and the selected embodiment may be the same or different for BB and AC.

[0187] Preferably, component BB is present in the core layer B composition in an amount of 15 to 45% by weight, more preferably 20 to 40% by weight, based on the total weight of the core layer B composition.

[0188] In particular, when combined with component AB, component BB contributes to good rigidity as well as high dirt impact resistance of the sealant film.

[0189] Ingredient CB The core layer composition may contain component CB. Preferably, component CB is a low-density ethylene polymer (LDPE), and preferably 918-928 kg / m³, as described for component CG of the inner layer G composition. 3It has a density and a melt flow rate (MFR2) of 1.5–2.5 g / 10 min as measured according to ISO 1133.

[0190] All embodiments described for component CG are embodiments of component CB. Component CB can be independently selected from any one of these embodiments, and the selected embodiment may be the same or different for CB and CG.

[0191] Preferably, component CB is present in the core layer B composition in an amount of 5 to 15% by weight, more preferably 7 to 13% by weight, based on the total weight of the inner layer B composition.

[0192] In one embodiment, the core layer B composition comprises or consists of components AB and BB, and optionally CB, in any one of the embodiments described above.

[0193] In a preferred embodiment, the core layer B composition comprises or consists of 50 to 75% by weight of component AB, 25 to 40% by weight of component BB, and optionally 0 to 15% by weight of component CE, based on the total weight of the core layer B composition.

[0194] outer layer A The outer layer A of the sealant film comprises an outer layer A composition containing one or more components. In a laminate film, the outer layer A may be positioned between the core layer B and the outer layer E of the printed film, and contributes to the mechanical and optical properties of the film.

[0195] Ingredient AA The outer layer composition may contain component AA. Preferably, component AA is a linear low-density ethylene polymer (LLDPE), and preferably in a quantity of 915-930 kg / m³, as described for component BG1 of the inner layer G composition. 3 It has a density and a melt flow rate (MFR2) of 0.05 to 1.0 g / 10 min, as measured according to ISO 1133.

[0196] All embodiments described for component BG1 are embodiments of component AA. Component AA can be independently selected from any one of these embodiments, and the selected embodiment may be the same or different in AA and BG1.

[0197] Preferably, component AA is present in the outer layer A composition in an amount of 25 to 55% by weight, more preferably 30 to 50% by weight, based on the total weight of the outer layer A composition.

[0198] Ingredients BA The outer layer composition may contain component BA. Preferably, component BA is a linear low-density ethylene polymer (LLDPE), and preferably, like component AC of the inner layer C composition, at 915-925 kg / m³. 3 It has a density and a melt flow rate (MFR2) of 0.5–2.0 g / 10 min as measured according to ISO 1133.

[0199] All embodiments described for component AC are embodiments of component BA. Component BA can be independently selected from any one of these embodiments, and the selected embodiment may be the same or different for BA and AC.

[0200] Preferably, component BA is present in the outer layer A composition in an amount of 25 to 55% by weight, more preferably 30 to 50% by weight, based on the total weight of the outer layer A composition.

[0201] Ingredient CA The outer layer A composition may contain component CA. Preferably, component CA is low-density ethylene polymer (LDPE), and preferably 918 kg / m³ as described for component CG of the inner layer G composition. 3 ~928 kg / m 3 It has a density in the range of and a melt flow rate (MFR2) in the range of 1.5 to 2.5 g / 10 min, as measured according to ISO 1133.

[0202] All embodiments described for component CG are embodiments of component CA. Component CA can be independently selected from any one of these embodiments, and the selected embodiment may be the same or different for CA and CG.

[0203] Preferably, component CA is present in the outer layer A composition in an amount of 5 to 35% by weight, more preferably 10 to 30% by weight, based on the total weight of the outer layer A composition.

[0204] In one embodiment, the outer layer A composition comprises or consists of components AA and BA, and optionally CA, in any of the embodiments described above.

[0205] In a preferred embodiment, the outer layer A composition comprises or consists of 30 to 50% by weight of component AA, 30 to 50% by weight of component BA, and optionally 0 to 30% by weight of component CA, based on the total weight of the outer layer A composition.

[0206] Specific Embodiments of Sealant Film The present invention also relates to a sealant film. In a particular embodiment, the present invention relates to a sealant film comprising an outer layer A, a core layer B and an inner layer C, wherein the inner layer C is a) 915~925 kg / m 3 Component AC is a linear low-density ethylene polymer having a density and a melt flow rate (MFR2) of 0.5-2.0 g / 10 min as measured according to ISO 1133; and b) 918~928 kg / m 3 The inner layer C composition is made of low-density polyethylene BC having a density and a melt flow rate (MFR2) of 1.5 to 2.5 g / 10 min as measured according to ISO 1133, preferably in an amount of 10 to 30% by weight based on the total weight of the inner layer C composition, and The following criteria: c) The core layer B has a density of 925-945 kg / m 3The core layer B composition is made of a medium-density polyethylene component AB having a density and a melt flow rate (MFR2) of 0.05 to 0.50 g / 10 min as measured according to ISO 1133, preferably in an amount of 40 to 75% by weight based on the total weight of the core layer B composition; and d) The outer layer A has a density of 915-930 kg / m². 3 The outer layer A composition comprises component AA, a linear low-density ethylene polymer having a density and a melt flow rate (MFR2) of 0.05 to 1.0 g / 10 min as measured according to ISO 1133, preferably in an amount of 30 to 50% by weight based on the total weight of the outer layer A composition. Satisfy at least one of the following conditions.

[0207] In one embodiment, criterion c) is satisfied. In another embodiment, criterion d) is satisfied. In yet another embodiment, both criteria c) and d) are satisfied.

[0208] Preferably, component AC is present in the inner layer C composition in an amount of 50-95% by weight, more preferably 60-90% by weight, and most preferably 70-85% by weight, based on the total weight of the inner layer C composition.

[0209] Components AC, BC, AB, and AA can be selected from any one of the embodiments described above.

[0210] The inner layer C composition may further contain component CC in any one of the embodiments described above.

[0211] The core layer B composition and the outer layer A composition may contain further components for specific layers of the sealant film, as described above.

[0212] <Characteristics> This sealant film is characterized by relatively high rigidity (i.e., tensile modulus of 300-500 MPa) and high drop impact (i.e., high DDI) and other tensile properties for a sealant film. This sealant film exhibits superior sealing behavior with lower seal initiation temperature and hot tack temperature (e.g., SIT below 95°C). These properties can be achieved by using component AC in the sealant film and can be further improved by the presence of component BC in the inner layer C. Furthermore, the presence of components AA and AB in the other layers A and B of the sealant film, respectively, further (along with components BA and BB) contributed to the superior properties of the sealant film.

[0213] Preferably, the sealant film has a seal onset temperature (SIT) at 5N of less than 100°C, preferably less than 95°C, when measured at the inner layer C of the sealant film. Preferably, the film has a seal onset temperature (SIT) at 5N of 80 to 100°C, preferably 85 to 95°C, when measured at the inner layer C of the sealant film. The seal onset temperature (SIT) at 5N is measured according to ASTM F 2029 and ASTM F 88.

[0214] Preferably, the sealant film has a mechanical direction (MD) tensile modulus (1% secant coefficient) of 280 MPa to 600 MPa, preferably 300 MPa to 500 MPa. The mechanical direction (MD) tensile modulus (1% secant coefficient) is measured according to ASTM D882.

[0215] Preferably, the sealant film has a haze value of less than 12%, more preferably less than 10%. Preferably, the sealant film has a haze value of 3-12%, more preferably 5-10%. The haze value is measured according to ASTM D1003 as an indicator of the transparency of the film, and this value indicates good transparency.

[0216] Preferably, the sealant film has a gloss value of at least 80, more preferably at least 90. Preferably, the sealant film has a gloss value of 80 to 140, more preferably 90 to 130. The gloss value (GU) is measured at 60 degrees in accordance with ISO 2813 in the inner layer C or the outer layer A, preferably in the inner layer C.

[0217] Preferably, the sealant film has a dirt drop impact (DDI) of at least 200 g, more preferably at least 210 g. Preferably, the sealant film has a dirt drop impact (DDI) of 200 to 600 g, more preferably 210 to 550 g. The dirt drop impact (DDI) is measured in accordance with ASTM D1709 "Method A" on a sealant film having a thickness of preferably 35 to 120 μm, more preferably 40 to 110 μm, most preferably 40 to 100 μm.

[0218] Polyethylene laminate film <Structure> In the present invention, the polyethylene laminate film comprises or consists of a sealant film and a printed film laminated to each other in any of the above-described embodiments.

[0219] The laminate film includes an inner surface and an outer surface, the inner layer G of the printed film forms the outer surface of the laminate film, and the inner layer C of the sealant film forms the inner surface of the laminate film.

[0220] In the laminate film, the printed film and the sealant film are connected via their respective outer layers E and A, and these layers form the intermediate layer of the laminate film. In other words, the outer layer A of the sealant film is laminated to the outer layer E of the printed film.

[0221] The bonding, i.e., laminating the printed film and the sealant film to each other, may be affected by conventional lamination equipment using conventional lamination methods, including adhesive lamination, which includes both solvent-based and solvent-free adhesive lamination using conventional commercially available adhesives. The adhesive can be applied to the sealant and / or printed film by any suitable method. For example, such methods include the use of a laminating machine, gravure coating, roll coating, wire rod coating, and spray coating. The film surface to which the adhesive is applied can be corona-treated to increase its surface energy and provide sufficient wettability to the adhesive components.

[0222] Lamination can also be performed as sandwich lamination, without the use of adhesive, with or without a meltweb between the films. Such a meltweb can be any conventional polyethylene-based meltweb material, such as LDPE. Lamination can also be performed by extrusion coating technology. All of these lamination methods are well known in the art and are documented in the literature.

[0223] Preferably, lamination is carried out using an adhesive (such as a solvent-free adhesive). The adhesive can form a layer between layer E and layer A (for example, adhesive layer D in Figure 1).

[0224] Preferably, the adhesive concentration is 1.0 g / m² per square meter. 2 From 3.5g / m 2 , more preferably 1.2 g / m 2 ~2.5g / m 2 It has the following weight.

[0225] Preferably, the adhesive (or adhesive layer) constitutes less than 5% by weight of the total weight of the laminate film. The percentage of adhesive typically depends on the total weight of the laminate film, which correlates with the thickness of the laminate film. For example, a laminate film of about 75 μm preferably contains up to 4% by weight of adhesive, based on the total weight of the laminate film, and a laminate film of about 130 μm preferably contains up to 3% by weight of adhesive, based on the total weight of the laminate film.

[0226] Preferably, the laminate film has a thickness of 50 to 160 μm, more preferably 55 to 145 μm, and most preferably 60 to 130 μm.

[0227] The laminate film is a "polyethylene film" as defined above for the printing film. Using polyethylene film provides a completely recyclable and sustainable packaging structure. Therefore, it is particularly preferable that both the printing film and the sealant film be polyethylene films, and the polyethylene film contains at least 90% by weight, more preferably at least 95% by weight, and most preferably at least 98% by weight of ethylene polymer (ethylene homopolymer and ethylene with one or more C3-C3 polymers) based on the total weight of each film. 12 It includes copolymers with α-olefins. Preferably, neither the printing film nor the sealant film contains non-polyolefin polymers such as polyester or polyamide. The laminate film may contain a non-polyolefin polymer in the adhesive layer (e.g., polyurethane adhesive), but this preferably constitutes less than 5% by weight of the total weight of the laminate film.

[0228] The base film is generally printed in reverse, meaning the printing is done on the outer layer E of the base film, which is then laminated with the outer layer A of the sealant film, as shown in Figure 1, and the outer layers E and A form the core / intermediate layer of the laminate film.

[0229] <Characteristics> The laminate film of the present invention possesses improved mechanical properties along with good optical properties and excellent barrier properties. Improved heat resistance allows the laminate film to run smoothly on high-speed VFFS machines. Generally, a higher SIT of the printing film than that of the sealant film is desired to avoid sealing jaw adhesion problems during subsequent use in VFFS lines, and this correlates strongly with delta SIT (also known as the SIT difference between the inner and outer surfaces of the laminate).

[0230] The compositions of the inner layers G and C of the printed film and sealant film are selected such that the seal onset temperature (SIT) at 5N on the outer surface of the laminate film is at least 10°C, preferably at least 11°C, and more preferably at least 12°C higher than the seal onset temperature at 5N on the inner surface of the laminate film, and the seal onset temperature is measured according to ASTM F 2029 and ASTM F 88.

[0231] Preferably, the seal initiation temperature (SIT) at 5N on the outer surface of the laminate film is 10 to 30°C, more preferably 12 to 25°C higher than the seal initiation temperature at 5N on the inner surface of the laminate film.

[0232] This temperature difference between the two outer layers of the laminate film allows the laminate film to run at a packaging speed of 50-80 bags / minute without causing problems with sticking to the jaws in the sealing bar of the VFFS line.

[0233] Preferably, the outer surface of the laminate film has a seal onset temperature (SIT) at 5N of at least 105°C, preferably at least 110°C, when measured on the outer surface of the laminate film (i.e., inner layer G). Preferably, the film has a seal onset temperature (SIT) at 5N of 105-125°C, preferably 110-125°C, when measured on the outer surface of the laminate film (i.e., inner layer G). The seal onset temperature (SIT) at 5N is measured according to ASTM F 2029 and ASTM F 88.

[0234] Preferably, the inner surface of the laminate film has a seal onset temperature (SIT) at 5N less than 110°C, preferably less than 105°C, when measured on the inner surface of the laminate film (i.e., inner layer C). Preferably, the film has a seal onset temperature (SIT) at 5N less than 80-110°C, preferably 85-105°C, and more preferably 85-100°C, when measured on the inner surface of the laminate film (i.e., inner layer C). The seal onset temperature (SIT) at 5N is measured according to ASTM F 2029 and ASTM F 88.

[0235] It should be noted that any of the above ranges for the seal initiation temperature at 5N(SIT) on the inner surface of the laminate film can be combined with any of the above ranges for the seal initiation temperature at 5N(SIT) on the outer surface of the laminate film.

[0236] A further important parameter in measuring film stiffness is the tensile strength / 1% secant coefficient. The secant coefficient is a measure of the film's strength characteristics in the elastic region and represents the actual deformation at a selected point on the stress-strain curve. As a result, the secant coefficient provides valuable insight into the stiffness and resistance to elongation during use, or how easily the film stretches during subsequent printing and packaging operations such as foam-fill-and-seal (FFS) machines, and / or under the normal operating tensions of packaging. Therefore, stiffness is extremely important for polyethylene films.

[0237] Preferably, the laminate film has a tensile modulus (1% secant modulus) in the machine direction (MD) of 400 MPa to 800 MPa, preferably 400 MPa to 600 MPa. The tensile modulus (1% secant modulus) in the machine direction (MD) is measured according to ASTM D882.

[0238] Preferably, the sealant film has a tensile modulus (1% secant modulus) in the machine direction (MD) of 280 MPa to 600 MPa, preferably 300 MPa to 500 MPa. The tensile modulus (1% secant modulus) in the machine direction (MD) is measured according to ASTM D882.

[0239] Preferably, the printed film has a tensile modulus (1% secant modulus) in the machine direction (MD) of 500 MPa to 1000 MPa, preferably 600 MPa to 800 MPa. The tensile modulus (1% secant modulus) in the machine direction (MD) is measured according to ASTM D882.

[0240] By using a high-rigidity (e.g., 400 - 600 MPa) polyethylene laminate film made of a developed sealant film having excellent rigidity (e.g., 300 - 500 MPa) and low SIT (e.g., less than 95°C), and laminating it with a printed film having excellent heat resistance (high SIT) and (e.g., 500 - 1000 MPa) and good optical properties (i.e., haze and gloss), it has been found that an improvement in the performance of the laminate film for high-speed FFS packaging can be achieved.

[0241] Preferably, the haze value of the laminate film is less than 12%, more preferably less than 10%. Preferably, the haze value of the laminate film is 3 - 12%, more preferably 5 - 10%. The haze value is measured according to ASTM D003 as a measure of the transparency of the film, and this value indicates good transparency.

[0242] Preferably, either or both of the printed film and the sealant film have a haze value of less than 12%, more preferably less than 10%. Preferably, either or both of the printed film and the sealant film have a haze value of 3 to 12%, more preferably 5 to 10%. The haze value is measured according to ASTM D1003 as a measure of the transparency of the film, and this value indicates good transparency.

[0243] Preferably, the laminate film has a gloss value of at least 80, more preferably at least 90. Preferably, the film has a gloss value of 80 to 140, more preferably 90 to 130. The gloss value (GU) is measured at 60° in accordance with ISO 2813 on the inner layer C or G, preferably the inner layer G which is the outer surface of the laminate film.

[0244] Preferably, either or both of the printed film and the sealant film have a gloss value of at least 80, more preferably at least 90. Preferably, either or both of the printed film and the sealant film have a gloss value of 80 to 140, more preferably 90 to 130. The gloss value (GU) is measured at 60° in accordance with ISO 2813 in each inner layer C / G or outer layer A / E, preferably inner layer G and / or C.

[0245] Excellent barrier properties (e.g., 4.0 g / m²) 2 A water vapor resistance of less than one day was achieved with the laminate film without the use of barrier coatings or metallization. Therefore, the laminate film of the present invention has good barrier properties, mainly when the moisture barrier is of utmost importance.

[0246] Preferably, the laminating film is 5 g / m². 2 Less than / day, more preferably 4.5g / m² 2 It has a water vapor transmission rate (WVTR) of 1 / day or less. Preferably, the laminate film is 1 to 4 g / m². 2 / day, more preferably 1.5-4.5g / m 2It has a water vapor transmission rate (WVTR) of / day. The water vapor transmission rate (WVTR) is measured according to ASTM F-1249 at 37.8°C and 90%RH.

[0247] Preferably, the laminating film is 2000 cm². 3 / m 2 / day or less, more preferably 1800cm 3 / m 2 It has an oxygen permeability (OTR) of 600-2000 cm² / day or less. Preferably, the laminate film is 600-2000 cm². 3 / m 2 / day, more preferably 800-1800cm 3 / m 2 It has an oxygen permeability rate (OTR) of / day. The oxygen permeability rate (OTR) is measured at 23°C and 0%RH according to ISO 15105-2.

[0248] Further characteristics of the laminating film are as follows: Preferably, the laminate film has a transverse (TD) tensile modulus (1% secant coefficient) of 500 MPa to 1200 MPa, more preferably 550 MPa to 1000 MPa. The transverse (TD) tensile modulus (1% secant coefficient) is measured according to ASTM D882.

[0249] Preferably, the laminate film has a tensile breaking stress in the mechanical direction (MD) of 40 to 80 MPa, more preferably 45 to 70 MPa. Preferably, the laminate film has a tensile breaking stress in the transverse direction (TD) of 25 to 60 MPa, more preferably 27 to 50 MPa.

[0250] Preferably, the laminate film has a break elongation in the mechanical direction (MD) of 350-700%, more preferably 400-650%. Preferably, the laminate film has a break elongation in the transverse direction (TD) of 450-900%, more preferably 500-800%.

[0251] The parameters for tensile fracture stress and elongation at fracture are measured according to ISO 527-3.

[0252] Preferably, the laminate film has a mechanical direction (MD) tear strength (Elmendorff) of 2.0 to 15.0 N, more preferably 2.2 to 10.0 N. Preferably, the laminate film has a transverse direction (TD) tear strength (Elmendorff) of 20.0 to 50.0 N, more preferably 23.0 to 45.0 N. The tear strength (Elmendorff) is measured according to ASTM D 1922.

[0253] Preferably, the laminate film has a dirt drop impact (DDI) of at least 200 g, more preferably at least 210 g. Preferably, the laminate film has a dirt drop impact (DDI) of 200 to 600 g, more preferably 210 to 550 g. The dirt drop impact (DDI) is measured on a laminate film with a thickness of preferably 50 to 160 μm, more preferably 55 to 145 μm, and most preferably 60 to 130 μm, according to ASTM D1709 "Method A".

[0254] Preferably, the laminate film has a coefficient of friction of less than 0.60, more preferably less than 0.50. Preferably, the laminate film has a coefficient of friction of 0.10 to 0.50, more preferably 0.15 to 0.48. The coefficient of friction is measured according to ISO 8295 under dynamic conditions (in / in or out / out).

[0255] In one embodiment, the seal onset temperature (SIT) of the outer surface of the laminate film at 5N, as measured according to ASTM F 2029 and ASTM F 88, is 10 to 30°C higher than the seal onset temperature of the inner surface of the laminate film at 5N, the gloss value measured at 60° according to ISO 2813 in the inner layer G is at least 80, and optionally the tensile modulus of elasticity (1% secant coefficient) in the mechanical direction (MD), as measured according to ASTM D882, is 400 MPa to 800 MPa.

[0256] <Preparation> Both the sealant film and the printed film of the laminate film are generally prepared by conventional methods for preparing multilayer films, and the layers of the film are co-extruded.

[0257] The different polymer components contained in any of the layers of the film are typically mixed closely before layer formation, for example, using a twin-screw extruder, preferably a reverse-rotating or co-rotating extruder. The blend is then converted into a co-extruded film.

[0258] The films can be manufactured by blown or cast film processes. To produce these multilayer films, for example, at least two polymer molten flows are typically extruded simultaneously (i.e., co-extruded) through a multi-channel tubular, annular, or circular die, blown up with air (or a combination of gases), expanded, and / or cooled to form the tubes that make up the film. The production of blown films is a well-known process.

[0259] Blown (co)extrusion can be carried out at temperatures ranging from 150°C to 230°C, more preferably from 160°C to 225°C, and cooled by a blown gas (generally air) at a temperature of 10°C to 40°C, more preferably from 12°C to 16°C, to obtain a frost line height of 0.5 to 4 times, more preferably 1 to 2 times, the diameter of the die.

[0260] The blow-up ratio (BUR) should generally be in the range of 1.5 to 3.5, preferably 2.0 to 3.0, and more preferably 2.1 to 2.8.

[0261] Since the sealant film and the printing film are preferably unoriented films, it is preferable not to subject them to a stretching process, considering the possibility of orientation.

[0262] Laminate film is prepared from sealant and printed film by the lamination process described above.

[0263] <Articles and Uses> The present invention also relates to articles comprising the polyethylene laminate film of the present invention. Preferred articles are packaging articles such as pouches, bags, pouches, sachets, and laminating tubes, such as stand-up pouches.

[0264] The present invention further relates to the use of the polyethylene laminate film of the present invention for packaging molded articles. In particular, it can be used in (vertical) form-fill seal packaging technology or for forming pouches such as stand-up pouches, bags, pouches, sacks, and laminating tubes.

[0265] Specific items and uses include sturdy transport bags, detergent pouches, and items and uses for packaging various food products such as rice, wheat, cereals, flour, food grains, and pet food, as well as non-food products such as detergents / powdered soaps, building materials, and chemicals.

[0266] Any one of the embodiments of the present invention described herein can be combined with one or more of these embodiments. In particular, any embodiment described for the polyethylene laminate film of the present invention can be applied to the use of the polyethylene laminate film or molded article.

[0267] Furthermore, the present invention relates to a molded article containing a sealant film, as described above with respect to a laminate film, and to the use of a sealant film for packaging a molded article.

[0268] The present invention will be further described below with reference to the figures.

[0269] <Measurement and Judgment Methods> The following definitions and determination methods of terms apply to the above general description of the present invention and the following examples, unless otherwise specified.

[0270] a) Measurement of Melt Flow Rate (MFR) The melt flow rate (MFR) is measured according to ISO 1133 and expressed in units of g / 10 min. A higher melt flow rate indicates lower polymer viscosity. MFR values ​​are for polyethylene at 190°C with loads of 2.16 kg (MFR2), 5.00 kg (MFR5), and 21.6 kg (MFR2). 21 It is measured at ).

[0271] The flow rate ratio (FRR) is an indicator of molecular weight distribution and shows the ratio of flow rates at different loads. Therefore, FRR 21 / 5 is MFR 21 This shows the value of / MFR5.

[0272] b) Density The polymer density was measured in kg / m³ using compression-molded test specimens prepared according to ISO 17855-2, in accordance with ISO 1183-1:2004 (Method A). 3 This is shown.

[0273] c) GPC 1) Conventional GPC method Molecular weight average (M z M w and M n ), molecular weight distribution (MWD), and polydispersity index PDI = M w / M n (In the formula, M n M is the number-average molecular weight. w Its width (where is the weight-average molecular weight) was measured by gel permeation chromatography (GPC) using the following formula, in accordance with ISO 16014-1:2003, ISO 16014-2:2003, ISO 16014-4:2003 and ASTM D 6474-12:

number

number

number

[0274] Constant dissolution interval ΔVi During A i M i Each represents the amount of elution V. i The peak slice area of ​​the chromatography and the molecular weight (MW) of the polyolefin are related, and N is equal to the number of data points obtained from the chromatogram between integration limits.

[0275] A high-temperature GPC system equipped with an infrared (IR) detector (PolymerChar (Valencia, Spain) IR4 or IR5) or an Agilent Technologies differential refractometer (RI), and featuring three Agilent-PLgel Olexis columns and one Agilent-PLgel Olexis Guard column, was used. 1,2,4-trichlorobenzene (TCB) stabilized with 250 mg / L 2,6-ditert-butyl-4-methyl-phenol was used as the mobile phase. The chromatography system was operated at a column temperature of 160°C, detector temperature of 160°C, and a constant flow rate of 1 mL / min. 200 μL of sample solution was injected per analysis. Data acquisition was performed using either Agilent Cirrus software version 3.3 or PolymerChar GPC-IR control software.

[0276] The column set was calibrated using 19 narrow-width polystyrene (PS) standards ranging from 0.5 kg / mol to 11500 kg / mol. The PS standards were dissolved at room temperature over several hours. The conversion from the peak molecular weight of polystyrene to the molecular weight of polyolefins was performed using the Mark Houwink equation and the following Mark Houwink constant.

number

[0277] A cubic polynomial fit was used to fit the calibration data.

[0278] All samples were prepared in a concentration range of approximately 1 mg / mL, and the PE was dissolved at 160°C for 3 hours in fresh distilled TCB stabilized with 250 ppm Irgafos 168, while continuously shaking gently.

[0279] 2)GPC viscosity method Average molecular weight of LDPE (M z M w M n The molecular weight distribution (MWD) was measured by the GPC-viscosity method with universal calibration. The average molecular weight (Mw, Mn), molecular weight distribution (MWD), and polydispersity index PDI = Mw / Mn (where M n M is the number-average molecular weight. w The broadness of the sample, expressed as weight-average molecular weight, was measured by gel permeation chromatography (GPC) according to ISO 16014-4 2019. A PL 220 GPC (Polymer Laboratories) equipped with an IR4 infrared detector and an online 4-capillary bridge viscometer (PL-BV 400-HT) was used. Three Olexis columns and one Olexis Guard column (Polymer Laboratories) were used as the stationary phase, and 1,2,4-trichlorobenzene (TCB, stabilized with 250 mg / L 2,6-ditert-butyl-4-methylphenol) was used as the mobile phase at 160°C and a constant flow rate of 1 mL / min. 200 μL of sample solution was injected for each analysis. The detector constant and inter-detector delay volume of the corresponding viscometer were measured using a narrow PS standard (MWD=1.01) with a molar mass of 132900 g / mol and an intrinsic viscosity of 0.4789 dl / g. The detector constants for the IR4 detector were set to NIST1475a, with a dn / dc ratio of 0.094 cm⁻¹. 3 Measured as / g

[0280] The column set consisted of at least 15 narrow MWD polystyrene (PS) standards ranging from 0.5 kg / mol to 11600 kg / mol, calibrated using universal calibration (according to ISO 16014-2:2019). The intrinsic viscosity of the relevant PS standards was determined from the corresponding concentration (IR4), online viscometer signal, and detector constant of the measured polystyrene. For low molecular weight PS with a molar mass of less than 3000 g / mol, the initial weighing concentration was used due to end-group effects in the IR detector.

[0281] The molecular weight (M2) of the sample in each chromatography slice using the universal calibration method can be calculated by the following correlation:

number

[0282] All data processing and calculations were performed using Cirrus Multi-Offline SEC-Software version 3.2 (Polymer Laboratories a Varian inc. Company).

[0283] All samples were prepared by dissolving 5.0–9.0 mg of polymer in 8 mL (160°C) of stabilized TCB (same as the mobile phase), and stirring continuously at a maximum of 160°C for 2.5 hours for PP and a maximum of 3 hours for PE.

[0284] d) Comonomer content The comonomer content was measured as described on pages 31-34 of International Publication 2019 / 081611.

[0285] e) Mechanical properties Tensile modulus and tensile fracture stress The tensile properties of the film were measured at 23°C using Type 2 test specimens with the blown film shown below, in accordance with ISO 527-3. The tensile modulus in the mechanical direction (MD) and the tensile modulus in the transverse direction (TD) were measured according to ASTM D882, at a test speed of 500 mm / min, a gauge length of 50 mm, and a 1% secant coefficient.

[0286] Tensile fracture stress was measured according to ISO 527-3, specimen type 2, with a gauge length of 50 mm and a test speed of 500 mm / min. Film samples were prepared as described in the "Examples" section below.

[0287] Elongation at fracture The elongation at break in the mechanical direction (MD) and transverse direction (TD) was measured in accordance with ISO 527-3 on films of the specified thickness manufactured as described in the "Examples" below.

[0288] Impact of falling onto dirt The dirt drop impact (DDI) was measured using a film of the specified thickness manufactured according to ASTM D1709 "Method A" as described in the "Examples" below.

[0289] f) Optical properties The gloss, clarity, and haze of the film were measured according to ISO 2813 (gloss) and ASTM D1003 (haze and clarity) on films of the specified thickness manufactured as described in the "Examples" below.

[0290] The gloss of the outer and inner layers was measured at a 60° angle according to ISO 2813. As per ISO 2813, the BYK-Gardner Micro-TRI-Gloss Meter allows for three measurement angles (20°, 60°, and 85°), and the gloss value at 60° is recorded and reported as gloss units (GU). Therefore, gloss is measured on both surfaces of the film and determined separately.

[0291] g) coefficient of friction The coefficient of friction under dynamic conditions was measured according to ISO 8295, both in / in and out / out.

[0292] h) Sealing Initiation Temperature (SIT) In principle, a heat seal is formed by pressing two films (polymers) together to create a firm contact while they are at least partially molten. This test method also covers the evaluation section after the heat seal process. The force required to separate the test specimen containing the seal is measured using a UTM (also to identify the mode of specimen failure). In accordance with ASTM F 2029; ASTM F 88 standards, test specimens with a sealed surface of the film manufactured as described in the "Examples" below were selected. A minimum of five test specimens must be used for each sealing temperature. The term "Seal Initiation Temperature" (SIT) is defined as "Seal Initiation Temperature at 5N" and refers to the temperature at which a seal with a strength of 5N is formed after cooling. The temperature at which a heat seal is formed immediately after the sealing operation (seal time of 1.0 second and seal pressure of 3 bar for film thicknesses less than 65 microns, and seal time of 1.5 seconds for film thicknesses of 65 microns or more), and the strength of the heat seal are measured at specific time intervals (at least 24 hours after the sealing cycle is completed and the seal has cooled to ambient temperature and reached its maximum strength).

[0293] i) Hot tack temperature This test method is a procedure that measures the temperature required for a film sample to reach a specified seal strength under specified sealing time and pressure, in accordance with the ASTM F 1921 standard. Therefore, in the hot tack test, the heat seal strength of the film immediately after sealing is measured before it cools to room temperature conditions. The test required film test specimens with a width of 25 mm and a length of 250 mm or more for each sealing temperature. In accordance with ASTM F 1921, the hot tack temperature (°C) at a force of 1 N was measured under the following conditions: sealing pressure of 3 bar, dwell / seal time of 1 second, cooling / delay time of 100 milliseconds (release), and test / peel speed of 200 mm / second. For thicknesses of 65 microns or more, a dwell / seal time of 1.5 seconds is used under similar test conditions.

[0294] j) Water vapor transmission rate (WVTR) The water vapor transmission rate of the films manufactured in the "Examples" described below was measured according to the ASTM F-1249 standard. The water vapor transmission rate (WVTR) test was performed at 37.8°C and 90% relative humidity (RH) according to ASTM F1249:2006 and / or ISO15106-2:2003.

[0295] k)Oxygen transmission rate (OTR) Oxygen barrier properties, i.e., oxygen permeability, were measured using a blown film manufactured as described below. The test specimen was installed as a sealed semi-barrier between two chambers under ambient atmospheric pressure. One chamber was slowly purged with a nitrogen stream at a predetermined temperature and relative humidity, and the other chamber was purged with an oxygen stream at the same temperature and relative humidity as the nitrogen stream. When oxygen gas permeates the film and enters the nitrogen carrier gas, the oxygen gas is carried to a coulometric detector, where it generates an electric current. The magnitude of this current is proportional to the amount of oxygen flowing into the detector per unit time. The oxygen permeability (OTR) test was conducted according to ISO 15105-2, at a temperature of 23°C, relative humidity of 0%, using 10 sccm of N2 and O2 (99.5%) gas, with a film surface area of ​​50 cm². 2 It will be implemented in [location / location].

[0296] l) Thickness The film thickness was measured according to ISO 4593. [Examples]

[0297] Three-layer sealant films and printed films, each consisting of a core layer, an inner layer, and an outer layer, were manufactured. Example IE1 represents the laminate sealant film of the present invention, and Example CE1 is a comparative sealant film. Examples IE2 and IE3 represent the laminate printed films of the present invention, and CE2 is a comparative printed film. The thickness of each sealant film was 45 μm, and the thickness of each printed film was 27 μm. The thickness of the core layer of each film was 50% of the total thickness of the film, and the thickness of each outer layer (i.e., the inner and outer layers) was 25% of the total thickness of the film.

[0298] All examples and comparative examples of the present invention are unstretched films (by definition). Details of the examples and comparative examples are summarized below: The laminate film was manufactured using these sealants and printed films: Invention Laminate 1 (IE4) includes an IE1 sealant film and an IE2 printed film; Invention Laminate 2 (IE5) includes an IE1 sealant film and an IE3 printing film; and The comparative laminate (CE3) includes CE1 sealant film and CE2 printing film.

[0299] Further details of the film are shown in Table 1.

[0300] [Table 1]

[0301] The polymers used in the production of the film of the present invention and the comparative example film are shown below.

[0302] [Table 2]

[0303] experiment Because no special stretching equipment was used in the film preparation, the film can be produced on a standard blown and / or cast film line using a standard film machinery system (nip roller or takeoff roller and winder) and can be called an "unstretched film." The film can be formed by any suitable method of the blown film and / or cast film process, and the materials forming each layer can be co-extruded through a co-extrusion feed block and die assembly, resulting in a film with three or more layers bonded together but with different compositions.

[0304] The polyethylene blend used for the printed film layers described above can be manufactured by a suitable conventional multilayer film extrusion line at a temperature of preferably 150-230°C, more preferably 160-225°C. Conventional blown film manufacturing techniques used in this regard are known in principle and are available to those skilled in the art. Typically, each film layer is co-extruded at a temperature of 160-225°C and cooled by blowing air at a temperature of 12-16°C to obtain a frost line height of 1-2 times the diameter of the die.

[0305] The blown film was manufactured using a Polyrema (Reifenhauser, blown film line with internal bubble cooling system) with a production capacity of 150 kg / hr and a cooling air temperature of 12-16°C. Details are shown in Table 3.

[0306] [Table 3]

[0307] Tables 4 and 5 show the temperature profiles of the blown film lines for sealant film and printing film, respectively, i.e., the melting temperatures and melting pressures used for different layers of the blown film extruder. The films were manufactured using a standard co-extruder for polyethylene, but slightly different process conditions were used for each film to optimize the film's appearance and ensure stable film production.

[0308] [Table 4]

[0309] [Table 5]

[0310] Table 6 shows the temperature profiles of the blown film line, i.e., the temperatures used for different layers of the blown film extruder at different locations in the blown film line.

[0311] [Table 6]

[0312] Lotogravure printing process All printed films in Table 1 were printed on a BOBST Rotomec 4003, 10-color rotogravure press. The tension of the take-up machine was optimized for running 27μm PE film, and a tension of 4-6 bar was used for smooth operation. The unwinding tension was kept very close to the winding tension of 4-6 bar and adjusted when printing on the reverse side at (high) speeds exceeding 200 meters / min.

[0313] Lamination preparation After rotgravure printing, the reversed printed substrate film and sealant film were laminated using a solvent-free bonding system from Henkel. Lamination was performed using a solvent-free laminator from Nordmeccanica at a travel speed of 250 m / min and an adhesive rate of 1.7 g / m². 2 I went there.

[0314] VFFS packaging trial The vertical foam-fill sealing (VFFS) machine used to manufacture the flexible pouches was a polyheat sealing (PHS) machine manufactured by Pace Packaging (model Pace P250 4S). The operating parameters are shown in Table 7.

[0315] [Table 7]

[0316] Characteristics of film The laminate film was tested for several properties, including barrier properties, mechanical strength, and optical properties. The results are shown in Table 8, and the characteristics of the sealant film and printed film are discussed.

[0317] [Table 8]

[0318] The properties of the laminate sealant and printed film are shown below.

[0319] [Table 9]

[0320] As can be seen from Table 9, the IE1 sealant film exhibits improved mechanical properties (tensile modulus, tensile strength, tensile breaking stress, dirt drop impact, tear resistance) and optical properties (haze and gloss) compared to the comparative sample CE1.

[0321] The high 1% secant coefficients (300-500 MPa) shown in Table 9 indicate that IE1 sealant films have improved rigidity capabilities compared to CE1 sealant films, meaning that IE1 films require more energy input to deform the film to the same relative degree. This makes them more suitable for manufactured laminate films.

[0322] The tensile properties and dirt-drop impact (DDI) of IE1 sealant films are both remarkably high, along with excellent optical properties. These results are generally used to maintain the high mechanical performance of laminate films.

[0323] The coefficient of friction (COF) of both outer layers was measured under dynamic conditions and was less than 0.5, indicating that it is suitable for subsequent processes such as lamination and FFS work.

[0324] IE1 sealant film reduces water vapor transmission rate (WVTR) by 30% to 40%, demonstrating superior moisture barrier performance compared to CE1 film.

[0325] The sealing behavior of the IE1 sealant film is shown in Figure 2 by its low seal initiation temperature and low hot tack temperature, namely, a seal initiation temperature of approximately 95°C or less at 5N and a hot tack seal initiation temperature of approximately 90°C or less at 1N, which reflects its seal integrity performance. A low SIT of the sealing layer is essential to create a difference in SIT or heat resistance between the sealing layer and the top layer of the printed film, and therefore the sealing behavior of the IE1 sealant film can improve the overall performance of the laminate film, resulting in advantages during packaging operations on VFFS machines (faster packaging speeds while the film is used for VFFS packaging applications).

[0326] Once the sealant film is laminated to the substrate, the overall thickness of the laminate becomes greater than that of a single sealant film, causing the SIT of the sealing layer C of the laminate to rise to a slightly higher temperature (nearly 100°C).

[0327] Therefore, the IE1 sealing layer has improved sealing properties compared to the CE1 sealing layer, meaning that less energy is required to produce the same seal strength. This is very beneficial when using (laminate) film in packaging line operations at a packaging rate of 50-80 pouches / minute.

[0328] [Table 10]

[0329] Referring to Table 10, compared to the comparative CE2 printing film, the IE2 and IE3 printing films also showed higher tensile modulus (1% secant coefficient) and higher tensile strength. The film properties obtained using the described formulations showed that the 1% (MD) secant coefficient of the IE2 and IE3 printing films was in the range of 620–660 MPa, exhibiting high rigidity. This not only improves the overall rigidity of the laminate film but also provides an excellent base that meets the requirements of high-speed printing operations. Therefore, it becomes easier to run the laminate film at faster packaging speeds.

[0330] For IE2 and IE3 printed films, improvements have been reported not only in optical properties (haze and gloss) but also in barrier performance (WVTR and OTR).

[0331] The seal initiation temperature at 5N for the inner layers of IE2 and IE3 is higher compared to the CE2 sample.

[0332] Figure 3 shows that the polyethylene substrate of the present invention exhibits improved heat resistance (compared to the CE2 sample, the seal onset temperature at 5N in the inner layers of IE2 and IE3 is higher, in the range of 110-120°C), which helps to generate a higher delta SIT (ΔSIT). Delta SIT (ΔSIT) is calculated as the difference between the seal onset temperature (SIT) of the printed film layer G and the seal onset temperature (SIT) of the sealant film layer C. Therefore, the IE2 and IE3 films can withstand the high temperatures of the uppermost vertical seal bar of the FFS packaging machine and can also generate a high delta SIT (between the outer laminate surface and the inner laminate surface). The initial disclosures of this specification include at least the following aspects: [1] A polyethylene laminate film including an inner surface and an outer surface, a) A printed film comprising an outer layer E, a core layer F, and an inner layer G, wherein the inner layer G forms the outer surface of the laminate film, and the inner layer G has a density of 920-935 kg / m². 3 The density and melt flow rate (MFR) of 0.5-2.0 g / 10 min are measured according to ISO 1133. 2 A printed film made of an inner layer G composition containing component AG, which is an ethylene copolymer having ) and b) A sealant film comprising an outer layer A, a core layer B, and an inner layer C, wherein the inner layer C forms the inner surface of the laminate film, and the inner layer C is made of an inner layer C composition comprising at least one ethylene polymer; Includes, The outer layer A of the sealant film is laminated to the outer layer E of the printing film. A polyethylene laminate film in which the seal onset temperature (SIT) at 5N on the outer surface of the laminate film is at least 10°C higher than the seal onset temperature at 5N on the inner surface of the laminate film, and the seal onset temperature is measured according to ASTM F 2029 and ASTM F 88. [2] The inner layer C composition is 915-925 kg / m 3 The density and melt flow rate (MFR) of 0.5-2.0 g / 10 min are measured according to ISO 1133. 2 The polyethylene laminate film according to [1], comprising component AC, which is a linear low-density ethylene polymer having ). [3] The inner layer G composition of the printing film contains 50 to 75% by weight of component AG based on the total weight of the inner layer G composition; and / or the inner layer C composition of the sealant film contains 915 to 925 kg / m 3 The density and melt flow rate (MFR) of 0.5-2.0 g / 10 min are measured according to ISO 1133. 2 A polyethylene laminate film according to [1] or [2], comprising component AC, which is a linear low-density ethylene polymer having ), in an amount preferably 60 to 90% by weight based on the total weight of the inner layer C composition, wherein the density of component AC is lower than the density of component AG. [4] The inner layer G composition of the printed film is 915-930 kg / m 3 The density and melt flow rate (MFR) of 0.05-1.0 g / 10 min are measured according to ISO 1133. 2 Component BG1 is a linear low-density ethylene polymer having ) and / or 950-970 kg / m 3 The density and melt flow rate (MFR) of 0.2-2.0 g / 10 min are measured according to ISO 1133. 2 The polyethylene laminate film according to [3] further comprises component BG2, which is a high-density ethylene polymer having ), preferably comprising either or each of components BG1 and BG2 in an amount of 15 to 45% by weight based on the total weight of the inner layer G composition. [5] Any or all of the components AC, AG, and BG2 are a bimodal ethylene copolymer, preferably any or both of the components AC and AG are ethylene and at least two different C 4 -C 12 A polyethylene laminate film according to [3] or [4], wherein the polyethylene laminate film is a copolymer with an α-olefin monomer. [6] The inner layer C composition of the sealant film is 918-928 kg / m 3 The density and melt flow rate (MFR) of 1.5-2.5 g / 10 min are measured according to ISO 1133. 2 A polyethylene laminate film according to any one of [3] to [5], further comprising component BC, which is low-density polyethylene having ), in an amount preferably 10 to 30% by weight based on the total weight of the inner layer C composition. [7] The core layer F of the printed film is 950-970 kg / m 3 The density and melt flow rate (MFR) of 0.2-2.0 g / 10 min are measured according to ISO 1133. 2 A polyethylene laminate film according to any one of [1] to [6], wherein the core layer F composition comprises a component AF which is a high-density ethylene polymer having ) in an amount preferably up to 90% by weight, based on the total weight of the core layer F composition. [8] The core layer F composition of the printing film is 920-935 kg / m 3 The density and melt flow rate (MFR) of 0.5-2.0 g / 10 min are measured according to ISO 1133. 2 The polyethylene laminate film according to [7], further comprising component BF, which is an ethylene copolymer having ), in an amount preferably 5 to 40% by weight based on the total weight of the core layer F composition. [9] The core layer B of the sealant film has a density of 925-945 kg / m 3 The density and melt flow rate (MFR) of 0.05-0.50 g / 10 min are measured according to ISO 1133. 2 The core layer B composition contains component AB, which is medium-density polyethylene having the following properties, preferably in an amount of 40-75% by weight based on the total weight; and / or 915-925 kg / m 3 The density and melt flow rate (MFR) of 0.5-2.0 g / 10 min are measured according to ISO 1133. 2 A polyethylene laminate film according to any one of [1] to [8], comprising a core B layer composition comprising component BB, which is a linear low-density ethylene polymer having ), in an amount preferably 20 to 40% by weight based on the total weight of the core B layer composition.

[10] The outer layer A of the sealant film is 915-930 kg / m 3 The density and melt flow rate (MFR) of 0.05-1.0 g / 10 min are measured according to ISO 1133. 2 Component AA is a linear low-density ethylene polymer having ); and / or 915-925 kg / m 3 The density and melt flow rate (MFR) of 0.5-2.0 g / 10 min are measured according to ISO 1133. 2 A polyethylene laminate film according to any one of [1] to [9], wherein the outer layer A composition comprises a component BA, which is a linear low-density ethylene polymer having ), preferably containing either or each of components AA and BA in an amount of 30 to 50% by weight based on the total weight of the outer layer A composition.

[11] The following criteria: a) The laminate film and / or the sealant film and / or the printed film shall have a haze value of less than 12%, as measured according to ASTM D1003; b) The laminate film and / or the sealant film and / or the printed film shall have a gloss value of at least 80, measured at 60° in the respective inner layer C / G or outer layer A / E according to ISO 2813; c) The tensile modulus of the sealant film in the mechanical direction (MD) (1% secant), as measured according to ASTM D882, is 280-500 MPa, and / or the tensile modulus of the printed film in the mechanical direction is 500-1000 MPa, and / or the tensile modulus of the laminate film in the mechanical direction is 400-800 MPa; and d) The laminate film is measured at 5 g / m² at 37.8°C and 90% RH according to ASTM F-1249. 2 It has a water vapor transmission rate (WVTR) of less than / day and optionally measures 2000 cm² at 23°C and 0% RH according to ISO 15105-2. 3 / m 2 Having an oxygen permeability (OTR) of less than or equal to / d, A polyethylene laminate film according to any of the above [1] to

[10] , satisfying one or more of the following conditions.

[12] A polyethylene laminate film according to any one of [1] to

[12] , wherein the printed film has a thickness of 15 to 40 μm, the sealant film has a thickness of 35 to 120 μm, each of the printed film and the sealant film comprises up to 7 layers, is manufactured by a blown film or cast film process, is preferably an unstretched film, and optionally the laminate film includes an adhesive layer between the outer layer A of the sealant film and the outer layer E of the printed film.

[13] A sealant film comprising an outer layer A, a core layer B, and an inner layer C, The inner layer C is a) 915~925 kg / m 3 The density and melt flow rate (MFR) of 0.5-2.0 g / 10 min are measured according to ISO 1133. 2 Component AC is a linear low-density ethylene polymer having ) and b) 918~928 kg / m 3 The density and melt flow rate (MFR) of 1.5-2.5 g / 10 min are measured according to ISO 1133. 2 The inner layer C composition is made of low-density polyethylene having the following properties: Component BC is preferably 10 to 30% by weight based on the total weight of the inner layer C composition. The following criteria: c) The core layer B has a density of 925-945 kg / m 3 The density and melt flow rate (MFR) of 0.05-0.50 g / 10 min are measured according to ISO 1133. 2 The core layer B composition is made of a medium-density polyethylene having ) component AB, which preferably contains 40 to 75% by weight based on the total weight of the core layer B composition, and d) The outer layer A has a density of 915-930 kg / m². 3 The density and the melt flow rate (MFR) of 0.05-1.0 g / 10 min as measured according to ISO 1133. 2 The outer layer A composition is made of a linear low-density ethylene polymer component AA having ) in an amount of 30 to 50% by weight, based on the total weight of the outer layer A composition. A sealant film that satisfies at least one of the following conditions.

[14] A molded article comprising the polyethylene laminate film described in any of [1] to

[12] above or the sealant film described in

[13] above.

[15] Use of the polyethylene laminate film described in any of [1] to

[12] above or the sealant film described in

[13] above for packaging articles.

Claims

1. A polyethylene laminate film including an inner surface and an outer surface, a) A printed film comprising an outer layer E, a core layer F, and an inner layer G, wherein the inner layer G forms the outer surface of the laminate film, and the inner layer G has a density of 920 to 935 kg / m ３ The density and melt flow rate (MFR) of 0.5–2.0 g / 10 min as measured according to ISO 1133. ２ The inner layer G composition contains component AG, which is an ethylene copolymer having ethylene and at least two different C ４ -C １２ Printing films that are multimodal copolymers with α-olefin monomers; and b) A sealant film comprising an outer layer A, a core layer B, and an inner layer C, wherein the inner layer C forms the inner surface of the laminate film, and the inner layer C is made of an inner layer C composition comprising at least one ethylene polymer; Includes, The outer layer A of the sealant film is laminated to the outer layer E of the printing film. A polyethylene laminate film in which the seal onset temperature (SIT) at 5N on the outer surface of the laminate film is at least 10°C higher than the seal onset temperature at 5N on the inner surface of the laminate film, and the seal onset temperature is measured according to ASTM F2029 and ASTM F88.

2. The inner layer C composition is 915 to 925 kg / m ３ The density and melt flow rate (MFR) of 0.5–2.0 g / 10 min as measured according to ISO 1133. ２ The polyethylene laminate film according to claim 1, comprising component AC, which is a linear low-density ethylene polymer having ).

3. The inner layer G composition of the printing film contains component AG in an amount of 50 to 75% by weight, based on the total weight of the inner layer G composition; and / or the inner layer C composition of the sealant film contains 915 to 925 kg / m ３ The density and melt flow rate (MFR) of 0.5–2.0 g / 10 min as measured according to ISO 1133. ２ A polyethylene laminate film according to claim 1 or 2, comprising component AC, which is a linear low-density ethylene polymer having ), wherein the density of component AC is lower than the density of component AG.

4. The inner layer G composition of the printing film has a density of 915 to 930 kg / m ３ and a melt flow rate (MFR) of 0.05 to 1.0 g / 10 min measured according to ISO 1133, which is a linear low-density ethylene polymer as component BG1; and / or a density of 950 to 970 kg / m ２ and a melt flow rate (MFR) of 0.2 to 2.0 g / 10 min measured according to ISO 1133, which is a high-density ethylene polymer as component BG2. The polyethylene laminate film according to claim 3 further comprises ３ component BG2. ２ ​

5. The polyethylene laminate film according to claim 3, wherein any or all of the components AC, AG, and BG2 are bimodal ethylene copolymers.

6. Either or both of the aforementioned components AC and AG are ethylene and at least two different C ４ -C １２ The polyethylene laminate film according to claim 5, which is a copolymer with an α-olefin monomer.

7. The inner layer C composition of the sealant film is 918 to 928 kg / m ３ The density and the melt flow rate (MFR) of 1.5–2.5 g / 10 min, as measured according to ISO 1133. ２ A polyethylene laminate film according to claim 3, comprising component BC, which is low-density polyethylene having ).

8. The core layer F of the printing film has a density of 950 to 970 kg / m ３ The density and melt flow rate (MFR) of 0.2–2.0 g / 10 min as measured according to ISO 1133. ２ The polyethylene laminate film according to claim 1, comprising a core layer F composition containing component AF, which is a high-density ethylene polymer having ).

9. The core layer F composition of the printing film is 920 to 935 kg / m ３ The density and melt flow rate (MFR) of 0.5–2.0 g / 10 min as measured according to ISO 1133. ２ The polyethylene laminate film according to claim 8, further comprising component BF, which is an ethylene copolymer having ), in an amount of 5 to 40% by weight based on the total weight of the core layer F composition.

10. The core layer B of the sealant film has a density of 925 to 945 kg / m². ３ The density and melt flow rate (MFR) of 0.05–0.50 g / 10 min as measured according to ISO 1133. ２ It contains component AB, which is medium-density polyethylene having ) and / or 915-925 kg / m ３ The density and melt flow rate (MFR) of 0.5–2.0 g / 10 min as measured according to ISO 1133. ２ The polyethylene laminate film according to claim 1, comprising a core B layer composition containing component BB, which is a linear low-density ethylene polymer having ).

11. The outer layer A of the sealant film has a density of 915 to 930 kg / m². ３ The density and melt flow rate (MFR) of 0.05–1.0 g / 10 min as measured according to ISO 1133. ２ Component AA is a linear low-density ethylene polymer having ); and / or 915-925 kg / m³ ３ The density and melt flow rate (MFR) of 0.5–2.0 g / 10 min as measured according to ISO 1133. ２ The polyethylene laminate film according to claim 1, comprising an outer layer composition A containing component BA, which is a linear low-density ethylene polymer having ).

12. The following criteria: a) The laminate film and / or the sealant film and / or the printed film have a haze value of less than 12%, as measured according to ASTM D1003; b) The laminate film and / or the sealant film and / or the printed film have a gloss value of at least 80, measured at 60° in the respective inner layer C / G or outer layer A / E according to ISO 2813; c) The tensile modulus of the sealant film in the mechanical direction (MD) (1% secant), as measured according to ASTM D882, is 280 to 500 MPa, and / or the tensile modulus of the printing film in the mechanical direction is 500 to 1000 MPa, and / or the tensile modulus of the laminate film in the mechanical direction is 400 to 800 MPa; and d) The laminate film is measured at 5 g / m² according to ASTM F-1249 at 37.8°C and 90% RH. ２ Having a water vapor transmission rate (WVTR) of less than / day, A polyethylene laminate film according to claim 1, satisfying one or more of the following conditions.

13. The laminate film is measured at 23°C and 0% RH according to ISO 15105-2, with a thickness of 2000 cm². ３ / m ２ A polyethylene laminate film according to claim 12, having an oxygen permeability (OTR) of 1 / d or less.

14. The polyethylene laminate film according to claim 1, wherein the printed film has a thickness of 15 to 40 μm, the sealant film has a thickness of 35 to 120 μm, each of the printed film and the sealant film comprises up to seven layers, and is manufactured by a blown film or cast film process.

15. The polyethylene laminate film according to claim 14, which is an unstretched film.

16. The polyethylene laminate film according to claim 15, wherein the laminate film includes an adhesive layer between the outer layer A of the sealant film and the outer layer E of the printing film.

17. A sealant film for constituting the polyethylene laminate film described in claim 1, wherein the sealant film comprises an outer layer A, a core layer B, and an inner layer C. The inner layer C is a) 915-925kg / m ３ The density and melt flow rate (MFR) of 0.5–2.0 g / 10 min as measured according to ISO 1133. ２ A linear low-density ethylene polymer having ) wherein the ethylene copolymer comprises ethylene and at least two different C ４ -C １２ Component AC is a multimodal copolymer with an α-olefin monomer; and b) 918-928kg / m ３ The density and the melt flow rate (MFR) of 1.5–2.5 g / 10 min, as measured according to ISO 1133. ２ It is made of an inner layer C composition containing component BC, which is low-density polyethylene having the following properties: The following criteria: c) The core layer B has a density of 925 to 945 kg / m³ ３ The density and melt flow rate (MFR) of 0.05–0.50 g / 10 min as measured according to ISO 1133. ２ The core layer B composition is made of a medium-density polyethylene having the following properties: d) The outer layer A has a load of 915 to 930 kg / m ３ The density and the melt flow rate (MFR) of 0.05–1.0 g / 10 min as measured according to ISO 1133. ２ The outer layer composition A is made of a linear low-density ethylene polymer having the following properties: A sealant film that satisfies at least one of the following conditions.

18. A molded article comprising the polyethylene laminate film described in claim 1.

19. Use of the polyethylene laminate film according to claim 1 for packaging articles.

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